WO2019176047A1 - Battery system, moving body management system and photovoltaic power generation device management system equipped with same, and combined battery - Google Patents

Abstract

Provided is a battery system capable of securing the output performance of a combined battery as a whole in a wide charging rate region, extending the lifetime thereof, and optimizing the battery characteristics of the combined battery in accordance with a mode of use. The battery system 10 has an electricity storage device 20, a charging control device 40, and a remote monitoring device 50. The electricity storage device 20 is equipped with a combined battery 22, wherein the combined battery 22 is charged by power supplied from an external power supply 12 and is configured by connecting a high-energy secondary battery 22he and a high-output secondary battery 22hp in parallel. The charging control device 40 is connected between the external power supply 12 and the combined battery 22 and controls charging power for the combined battery 22. The remote monitoring device 50 remotely monitors the state of the combined battery 22. A charging control unit 44 of the charging control device 40 and a discharging control unit 28 of the electricity storage device 20 control the combined battery 22 so as to satisfy a use condition of the combined battery 22. A display unit 30 of the electricity storage device 20 notifies an owner of the electricity storage device 20 of a configuration condition of each of the secondary batteries 22he, 22hp.

Description

Battery system, mobile object management system and solar power generation device management system including the same, and composite battery

The present invention relates to a battery system for remotely managing a composite battery in which different types of batteries are connected in parallel, a mobile management system and a solar power generation apparatus management system including the battery system.

Due to the progress of the logistics revolution, small and medium trucks with a maximum loading capacity of 2 to 4 tons are rapidly spreading, but from the viewpoint of reducing carbon dioxide emissions, the electrification of small and medium trucks is an urgent task. . The development of electrification of lorries including small and medium trucks was promoted with a policy of diverting electric passenger car batteries from the viewpoint of cost and availability. However, since electric passenger car batteries are difficult to meet the demands of high output required for lorry start of lorries and stricter lifespans than passenger cars, lorry manufacturers simply use existing electric passenger car batteries. We are faced with the problem that the required performance cannot be met simply by diverting it.

In order to overcome this problem, a composite battery in which two types of secondary batteries having different properties are combined is disclosed. For example, Patent Document 1 discloses a battery in which a high-power secondary battery having different open circuit voltages and a large-capacity secondary battery are connected in parallel. Further, in Patent Document 2, the status of the secondary battery of the user is remotely monitored, and if necessary, the secondary battery is always normal by sending usage advice and information on failure and life to the user. A power control system that can be maintained in a state is disclosed. Furthermore, Patent Document 1 discloses that even when a request for an instantaneous high load or a request for a continuous load is frequently repeated, the high-power secondary battery and the large-capacity secondary battery can have a uniform charge capacity in a short time. As a result, there is a method for recovering the state of charge of a battery system that promotes early recovery of the battery system, thereby improving the power performance of the vehicle and reducing the size and weight compared to the performance of the battery system. It is disclosed.

Specifically, high output so that the decreasing tendency of the open circuit voltage with respect to the decrease in the charging rate in the high output secondary battery is larger than the decreasing tendency of the open circuit voltage with respect to the decrease in the charging rate in the large capacity secondary battery. By configuring the secondary battery and the large-capacity secondary battery, both the recovery time of the output characteristics and the recovery time of the input characteristics as the battery system are both optimal lengths. The charge balance with the large capacity secondary battery can be recovered at an early stage.

Patent No. 5250928 Japanese Patent No. 3758986

The power control system of Patent Document 2 does not transmit information regarding the use conditions of the composite battery and the configuration conditions of the high-power secondary battery and the large-capacity secondary battery that constitute the composite battery to the user. There is a problem that the output performance is ensured in a wide charge rate region and the life cannot be extended, and the battery characteristics of the composite battery cannot be optimized according to the usage pattern. Further, the method for recovering the state of charge balance in Patent Document 1 functions when the charging rate is about 50% or more, but when the charging rate is less than about 50%, depending on the combination of the secondary batteries, the large capacity 2 When an excessive input / output load is applied to the secondary battery, there is a problem that the output performance of the entire composite battery is ensured in a wide charge rate region, and the life thereof is shortened. The mechanism by which this problem occurs will be described.

For example, in the case of a lithium ion secondary battery, the internal resistance generally increases when the charging rate is less than about 50%, but the rate of increase differs depending on the type of the lithium ion secondary battery. When the input / output load is applied to a composite battery consisting of a lithium ion secondary battery with a large internal resistance increase rate and a small lithium ion secondary battery when the charge rate is less than about 50%, the charge rate is less than about 50%. The current balance in the composite battery changes. For example, when the rate of increase in internal resistance of a high-power secondary battery is small compared to a large-capacity secondary battery, a reduction in the charge rate of the high-power secondary battery is promoted, and as a result, the charge rate of the entire composite battery Since the remaining amount of the high-power secondary battery is insufficient when the battery voltage decreases, a situation occurs in which the output ratio from the large-capacity secondary battery increases. In this situation, an excessive input / output load is applied to the large-capacity secondary battery having a large increase rate of the internal resistance, the deterioration is promoted, and in the worst case, the thermal runaway may be caused. Further, in this situation, a situation occurs in which the output performance of the entire composite battery cannot be secured in a wide charge rate region. In this situation, there is a possibility that the electric lorry can not be accelerated at the time of merging on the highway and can be bumped or stopped on the slope without being able to climb the slope.

The present invention has been made in view of such conventional problems, and the object of the present invention is to ensure the output performance of the entire composite battery in a wide charge rate region and extend its life, An object of the present invention is to provide a battery system capable of optimizing the battery characteristics of a composite battery according to the usage form.
In addition to the above object, the other objects of the present invention are to maintain the performance of each secondary battery at least as much as the conventional one, to form a compact, lightweight and larger capacity composite battery, and at the time of failure. The object is to provide a battery system capable of distributing risk.

As a result of intensive research in order to achieve the above object, the present inventor first calculated the charge rate condition of the composite battery, the voltage calculated based on the voltage value, charge / discharge current value, and operating temperature of the composite battery. The usage conditions such as the conditions and the charge / discharge current conditions, and the configuration conditions such as the suitable capacity ratio of the high energy type secondary battery and the high power type secondary battery constituting the composite battery are transmitted from the remote monitoring device, and the usage conditions In addition to controlling the composite battery so as to satisfy the requirements and notifying the owner of the power storage device, the output performance of the overall composite battery of the power storage device is ensured in a wide charge rate region and the life thereof is extended. It was found that the battery characteristics of the composite battery can be optimized according to the usage form.

Further, the present inventor has determined that the internal resistance value of the high energy type secondary battery that changes with the change of the charging rate is an internal resistance at a reference charging rate that is arbitrarily set within a charging rate range of 45 to 55%. The first internal resistance ratio divided by the value and the second internal resistance ratio obtained by dividing the internal resistance value of the high-power secondary battery that changes as the charging rate changes by the internal resistance value at the same reference charging rate And the value when the charging rate of the internal resistance ratio of the high power secondary battery is 25 to 35% is the value when the charging rate of the internal resistance ratio of the high energy type secondary battery is 25 to 35%. By setting each internal resistance so as to be larger than the above, it has been found that the output performance of the entire composite battery can be ensured in a wide charging rate region and the life can be extended, and the present invention has been achieved. .

That is, the first embodiment of the present invention is connected between a power storage device having a composite battery that is charged by power from an external power source and then discharged, and the external power source and the composite battery, and charging power of the composite battery. A charge control device that controls the state of the composite battery, and a remote monitoring device that remotely monitors the state of the composite battery. The power storage device further includes a detection unit that detects the state of the composite battery, and a remote detection of the detection result of the detection unit A transmission / reception unit that transmits a discharge control notification and a display notification from a remote monitoring device, a discharge control unit that executes a discharge control notification, and a display unit that executes a display notification. A receiving unit that receives a charging control notification from the remote monitoring device, and a charging control unit that executes the charging control notification. The remote monitoring device is preferably used based on the detection result of the detecting unit received from the transmitting / receiving unit. Total method And a communication unit that transmits a calculation result of the calculation unit to the power storage device as a discharge control notification and a display notification, and a charge control notification to the charge control device. A high-energy secondary battery with a high weight output density, a low weight output density, and a large capacity, and a high-power secondary battery with a low weight energy density, a high weight output density, and a small capacity are connected in parallel. The state of the composite battery detected by the detection unit includes the voltage value, the charge / discharge current value, and the operating temperature of the composite battery, and the preferred usage method calculated by the calculation unit includes the use conditions of the composite battery, and the composite battery. The charge control unit and the discharge control unit satisfy the use conditions of the composite battery by executing the charge control notification and the discharge control notification, including the configuration conditions of the high energy type secondary battery and the high power type secondary battery to be configured. It controls composite cell as the display unit is to provide a battery system for informing the configuration conditions of the secondary battery to the owner of the power storage device by performing a display notification.

Here, in the first embodiment, the use condition of the composite battery includes the charge rate condition, the voltage condition, and the charge / discharge current condition of the composite battery, and the remote monitoring device uses the detection result of the detection unit and the calculation unit. It is preferable that the charge control unit and the discharge control unit have a function of remotely changing the use condition of the composite battery based on the calculation result.
The configuration conditions of each secondary battery include the life of each secondary battery, a suitable replacement time, and a suitable capacity ratio of the high energy type secondary battery and the high power type secondary battery. Consists of one submodule consisting of a plurality of single cells and one housing or a plurality of submodules connected in parallel to each other, and the remote monitoring device is based on the detection result of the detection unit and the calculation result of the calculation unit , Equipped with a function to remotely inform the owner of the storage device of the configuration conditions of each secondary battery, so that the owner of the storage device maintains the performance of each secondary battery by replacing the deteriorated submodule In addition, at least one submodule of one secondary battery having a plurality of submodules among the high energy type secondary battery and the high power type secondary battery is left, and the other submodules are placed in the other secondary module. Next battery Preferably optimized battery characteristics of the composite battery according to exchange and use form Bei submodules.
The high energy type secondary battery has a first open circuit voltage difference obtained by subtracting an open circuit voltage at a reference charge rate arbitrarily set within a charge rate range of 45 to 55% from an open circuit voltage at full charge, And a first internal resistance ratio obtained by dividing the internal resistance value at a charging rate of 25 to 35% by the internal resistance value at the reference charging rate, and the high power secondary battery has an open circuit voltage at full charge. Second open circuit voltage difference obtained by subtracting the open circuit voltage at the reference charge rate from the second internal resistance value obtained by dividing the internal resistance value at the charge rate of 25 to 35% by the internal resistance value at the reference charge rate. Each open circuit voltage is set such that the second open circuit voltage difference is greater than the first open circuit voltage difference, and each internal resistor has a second internal resistance ratio greater than the first internal resistance ratio. Is preferably set to be large.
The high energy type secondary battery is a lithium ion secondary battery, and the high power type secondary battery is a lithium ion secondary battery having a negative electrode active material using a material different from that of the high energy type secondary battery. preferable.
The high energy type secondary battery is an air battery using air as an active material, and the high power type secondary battery is preferably a lithium ion secondary battery.

The second embodiment of the present invention also includes a freely movable mobile body including the power storage device of the battery system of the first embodiment of the present invention, a charge control device of the battery system, and a remote of the battery system. The mobile device further includes a motor that generates power for movement with the power discharged from the power storage device, and the power connected to the power storage device between the motor and the power discharged from the power storage device. A moving body management system is provided that includes an inverter that converts electric power and outputs the converted electric power to a motor.

In addition, the third embodiment of the present invention includes a solar power generation device including the power storage device and the charge control device of the battery system of the first embodiment of the present invention, and a remote monitoring device of the battery system. The solar power generation apparatus further includes at least one solar power generation panel that generates power from solar energy and outputs DC power, and the DC power that is connected to the solar power generation panel and that is output from the solar power generation panel. Is connected to a connection point between the photovoltaic power generation panel and the inverter, or between the inverter and the external circuit, and the power supplied to the connection point is converted into power and charged. A photovoltaic power generation device management system comprising: a power conversion unit that outputs power to a device and converts power discharged from a power storage device into power and outputs the power to a connection point.

In addition, the fourth embodiment of the present invention is a high energy secondary battery having a high weight energy density, a low weight output density, and a large capacity, a low weight energy density, a high weight output density, and a small capacity. A high-power secondary battery is connected in parallel, and the high-energy secondary battery is a standard charge rate that is arbitrarily set within a charge rate range of 45 to 55% from the open circuit voltage when fully charged. The first open circuit voltage difference obtained by subtracting the open circuit voltage at the time of and the first internal resistance ratio obtained by dividing the internal resistance value at the charging rate of 25 to 35% by the internal resistance value at the reference charging rate. The high output type secondary battery has the second open circuit voltage difference obtained by subtracting the open circuit voltage at the reference charge rate from the open circuit voltage at full charge, and the internal resistance value when the charge rate is 25 to 35%. A second internal resistance ratio divided by the internal resistance value at the reference charging rate, and each open circuit voltage has a second A composite battery in which a circuit voltage difference is set to be larger than a first open circuit voltage difference and each internal resistance is set so that a second internal resistance ratio is larger than a first internal resistance ratio is provided. It is.

Here, in the fourth embodiment, the high-energy secondary battery is a lithium ion secondary battery, and the high-power secondary battery is a negative electrode active material using a material different from that of the high-energy secondary battery. A lithium ion secondary battery having a substance is preferable.
The high energy type secondary battery is an air battery using air as an active material, and the high power type secondary battery is preferably a lithium ion secondary battery.

ADVANTAGE OF THE INVENTION According to this invention, while ensuring the output performance of the whole composite battery in a wide charge rate area | region, the lifetime can be extended, The battery characteristic of a composite battery can be optimized according to a usage form.
Further, according to the present invention, in addition to the above effects, the performance of each secondary battery is maintained to be equal to or higher than that of the prior art, a compact, lightweight and larger capacity composite battery is configured, and the risk of failure is reduced. Can be dispersed.

It is a block diagram which shows the battery system of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the composite battery which comprises the electrical storage apparatus of the battery system of FIG. It is a graph which shows the relationship between the charging rate of each secondary battery which comprises the composite battery of FIG. 2, and an open circuit voltage. It is a graph which shows the relationship between the charging rate of each secondary battery which comprises the composite battery of FIG. 2, and internal resistance ratio. It is a side view which shows typically the lamination | stacking state of the single battery element of a lithium ion secondary battery. It is a side view which shows typically the lamination | stacking state of the cell element of an air battery. It is a side view which shows typically the lamination | stacking state of the cell element of an air battery. It is a block diagram which shows the composite battery group comprised by the composite battery of FIG. It is a block diagram which shows the mobile body management system of the 2nd Embodiment of this invention. It is a side view which shows typically arrangement | positioning of the mobile body of the mobile body management system of FIG. 8, and the composite battery which comprises the mobile body. It is a block diagram which shows the solar power generation device management system of the 3rd Embodiment of this invention. It is a block diagram which shows the solar power generation device management system of the 3rd Embodiment of this invention. It is a graph which shows the relationship between the charging rate of each secondary battery and the open circuit voltage in the Example of this invention. It is a graph which shows the relationship between the charging / discharging cycle frequency and charging rate of each secondary battery in the Example of this invention.

Hereinafter, the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
First, the battery system according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing a battery system according to a first embodiment of the present invention, and FIG. 2 is a block diagram showing a configuration of a composite battery constituting the power storage device of the battery system of FIG.

The battery system 10 of the present invention includes a power storage device 20, a charge control device 40, and a remote monitoring device 50. The power storage device 20 includes a composite battery 22, and the composite battery 22 is discharged by the external circuit 14 after being charged with power from the external power supply 12. The charging control device 40 is connected between the external power supply 12 and the composite battery 22 and controls the charging power of the composite battery 22. The remote monitoring device 50 remotely monitors the state of the composite battery 22. The power storage device 20 further includes a detection unit 24, a transmission / reception unit 26, a discharge control unit 28, and a display unit 30. The detection unit 24 detects the state of the composite battery 22. The transmission / reception unit 26 transmits the detection result of the detection unit 24 to the remote monitoring device 50 and receives a discharge control notification and a display notification from the remote monitoring device 50. The discharge control unit 28 executes a discharge control notification. The display unit 30 executes display notification. The power storage device 20 further includes a discharge circuit 28a. The discharge circuit 28a is connected between the composite battery 22 and the external circuit 14, and is directly controlled by the discharge control unit 28.

The charging control device 40 includes a receiving unit 42 and a charging control unit 44. The receiving unit 42 receives a charging control notification from the remote monitoring device 50. The charge control unit 44 executes a charge control notification. The charging control device 40 further includes a charging circuit 44 a, which is connected between the composite battery 22 and the external power supply 12 and is directly controlled by the charging control unit 44. The remote monitoring device 50 includes a calculation unit 52 and a communication unit 54. The calculation unit 52 calculates a suitable usage method based on the detection result of the detection unit 24 received from the transmission / reception unit 26. The communication unit 54 transmits the calculation result of the calculation unit 52 to the power storage device 20 as a discharge control notification and a display notification, and transmits to the charge control device 40 as a charge control notification. The composite battery 22 is configured by connecting a high-energy secondary battery 22he and a high-power secondary battery 22hp in parallel. The high energy secondary battery 22he has a high weight energy density, a low weight output density, and a large capacity. The high-power secondary battery 22hp has a low weight energy density, a high weight output density, and a small capacity.

The state of the composite battery 22 detected by the detection unit 24 includes the voltage value, charge / discharge current value, and operating temperature of the composite battery 22. The preferable usage method calculated by the calculation unit 52 includes the usage conditions of the composite battery 22 and the configuration conditions of the high-energy secondary battery 22he and the high-power secondary battery 22hp constituting the composite battery 22. The charge control unit 44 and the discharge control unit 28 control the composite battery 22 so as to satisfy the use condition of the composite battery 22 by executing the charge control notification and the discharge control notification. Display unit 30 notifies the owner of power storage device 20 of the configuration conditions of each of secondary batteries 22he and 22hp by executing a display notification.

Specifically, the use condition of the composite battery 22 may include at least one of the charge rate condition, the voltage condition, and the charge / discharge current condition of the composite battery 22, but preferably includes all of them. In that case, the remote monitoring device 50 causes the charge control unit 44 and the discharge control unit 28 to remotely change the use condition of the composite battery 22 based on the detection result of the detection unit 24 and the calculation result of the calculation unit 52. It has a function. That is, the remote monitoring device 50 remotely monitors the voltage value, the charge / discharge current value, and the operating temperature of the composite battery 22, and the charge control notification and discharge control notification to the charge control unit 44 and the discharge control unit 28. The function of remotely changing the upper limit value and lower limit value (charge depth and discharge depth) of the composite battery 22, the upper limit value and lower limit value of the voltage, and the upper limit value and lower limit value of the charge / discharge current by executing Is provided. In addition, it is not the owner of the power storage device 20 but the maintenance staff that notifies the configuration conditions of the secondary batteries 22he and 22hp.
By adopting such a configuration, the battery system of the present invention suppresses the deterioration of each secondary battery, so that the output performance of the entire composite battery can be secured in a wide charge rate region and the life thereof can be extended. it can.

The configuration conditions of each secondary battery 22he, 22hp are within the lifetime of each secondary battery 22he, 22hp, a suitable replacement time, and a suitable capacity ratio of the high-energy type secondary battery 22he and the high-power type secondary battery 22hp. At least one may be included, but preferably all of them are included. In this case, each of the secondary batteries 22he and 22hp is configured by one submodule or a plurality of submodules connected in parallel to each other, each of which includes a plurality of single cells and one housing. Furthermore, the remote monitoring device 50 has a function of remotely notifying the owner of the power storage device 20 of the configuration conditions of the secondary batteries 22he and 22hp based on the detection result of the detection unit 24 and the calculation result of the calculation unit 52. Thus, the owner of the power storage device 20 can maintain the performance of the secondary batteries 22he and 22hp by replacing the deteriorated submodule. Further, the owner of the power storage device 20 leaves at least one submodule of one secondary battery having a plurality of submodules of the high energy secondary battery 22he and the high output secondary battery 22hp, Other submodules can be replaced with spare submodules of the other secondary battery, and the battery characteristics of the composite battery 22 can be optimized according to the usage pattern.

That is, the remote monitoring device 50 executes a function of calculating the lifetime of each secondary battery 22he, 22hp, a suitable replacement time and a suitable capacity ratio of each secondary battery 22he, 22hp, and a display notification to the display unit 30. By providing the function, the owner of the power storage device 20 can be notified of the calculation result remotely. The high energy type secondary battery 22he or each submodule of the high energy type secondary battery 22he may include a protection circuit in order to ensure safety. Moreover, you may have the protection circuit board which performs the state monitoring and protection of the high energy type secondary battery 22he in the inside of a housing | casing. The same applies to the high-power secondary battery 22hp. Here, the lifetime is the number of repetitions or period required until the composite battery 22 deteriorates and cannot be loaded when an arbitrary charge / discharge pattern is repeatedly loaded. This lifetime is calculated based on the usage history of each of the secondary batteries 22he and 22hp and the composite battery 22 up to the present, the SOH (State of Health), the internal resistance and the rate of increase thereof. Also, the preferred replacement time is a time that is a predetermined period or time that is required for preparation from the time set based on the number of repetitions or the period of the life. A suitable capacity ratio will be specifically described in the description of the second and third embodiments of the present invention.
By setting it as such a structure, the battery system of this invention can optimize the battery characteristic of a composite battery according to a usage form while maintaining the performance of each secondary battery.

Next, characteristics of the composite battery constituting the power storage device of the battery system of the present invention will be described. 3 is a graph showing the relationship between the charging rate of each secondary battery constituting the composite battery of FIG. 2 and the open circuit voltage, and FIG. 4 is the charging rate of each secondary battery constituting the composite battery of FIG. It is a graph which shows the relationship between and internal resistance ratio.

The open circuit voltage of graphite, which is an example of the high energy type secondary battery 22he, gradually decreases linearly when the charging rate decreases from 100%, and rapidly decreases linearly when the charging rate becomes about 15% or less. . The difference between the open circuit voltage when the charging rate of graphite is 100% and the open circuit voltage when the charging rate is a reference charging rate, for example, 50%, is defined as Vde. The open circuit voltage of low crystalline carbon, which is an example of a high-power secondary battery 22hp, decreases linearly at a rate approximately twice that of graphite when the charging rate decreases from 100%, and the charging rate is about 50% or less. When it becomes, it falls in a curve so as to increase the decrease rate little by little. The difference between the open circuit voltage of the low crystalline carbon when the charging rate is 100% and the open circuit voltage when the charging rate is the reference charging rate, for example, 50%, is Vdp.

The internal resistance of graphite, which is an example of the high energy type secondary battery 22he, decreases slightly when the charging rate decreases from 100%, and increases gradually when the charging rate is about 50% or less. To increase. The ratio between the internal resistance of graphite when the charging rate is 30% and the internal charging rate when the charging rate is a reference charging rate, for example, 50%, is Rde. The internal resistance of low crystalline carbon, which is an example of a high-power secondary battery 22hp, increases slightly when the charging rate decreases from 100%, and is more than twice that of graphite when the charging rate is about 50% or less. And it increases in a curve so as to increase the increase rate little by little. The ratio between the internal resistance of the low crystalline carbon when the charging rate is 30% and the internal resistance when the charging rate is the reference charging rate, for example, 50%, is Rdp.

The high energy type secondary battery 22he has a first open circuit voltage difference obtained by subtracting the open circuit voltage at a reference charge rate arbitrarily set within a charge rate range of 45 to 55% from the open circuit voltage at full charge. Vde and a first internal resistance ratio Rde obtained by dividing an internal resistance value at a charging rate of 25 to 35% by an internal resistance value at a reference charging rate, and the high-power secondary battery 22hp is fully charged The second open circuit voltage difference Vdp, which is obtained by subtracting the open circuit voltage at the reference charge rate from the open circuit voltage, and the internal resistance value at the charge rate of 25 to 35% is divided by the internal resistance value at the reference charge rate. Each open circuit voltage is set such that the second open circuit voltage difference Vdp is greater than the first open circuit voltage difference Vde, and each internal resistance is a second internal resistance The ratio Rdp may be set to be larger than the first internal resistance ratio Rde.

That is, the reference charge rate is arbitrarily set within the range of 45 to 55%, and then the high output type at the time of the reference charge rate from the open circuit voltage of the high output type secondary battery 22hp when fully charged. The voltage difference Vdp obtained by subtracting the open circuit voltage of the secondary battery 22hp is the open circuit voltage of the high energy secondary battery 22he at the reference charge rate from the open circuit voltage of the high energy secondary battery 22he when fully charged. Each open circuit voltage is set so as to be larger than the voltage difference Vde obtained by subtracting, and then, the internal resistance value of the high-power secondary battery 22hp at the charge rate of 25 to 35% is calculated based on the reference charge rate. When the resistance ratio Rdp divided by the internal resistance value of the high-power secondary battery 22hp at the time is 25 to 35% of the charging rate, the internal resistance value of the high-energy secondary battery 22he is high at the reference charging rate. Resistance ratio R divided by internal resistance of energy type secondary battery 22he As larger than e, it may be set each internal resistance. Here, full charge is a state in which the charging rate is 100%, and a state in which the charging rate is 0% is called complete discharge.
By setting it as such a structure, the battery system of this invention can ensure the output performance of the whole composite battery in a wide charge rate area | region, and can extend the lifetime.

Examples of parameters affecting the setting of the open circuit voltage of the secondary battery include, for example, a combination of a positive electrode active material and a negative electrode active material in the case of a lithium ion secondary battery. Moreover, when the main parameter which influences the setting of the internal resistance of a secondary battery is illustrated, for example in the case of a lithium ion secondary battery, the 1st parameter is a material component of an active material. That is, the reaction rate of insertion / extraction of lithium ions into the active material varies depending on the material components of the active material, and also varies depending on the amount of lithium ions contained in the active material. Therefore, in addition to the combination of the material components of the positive electrode active material and the negative electrode active material, the internal resistance, particularly the rate of change of the internal resistance when the charging rate changes, also depends on the compounding ratio of the negative electrode active material to the positive electrode active material. .

The second parameter is the composition of the electrode mixture which is a mixed material of the active material, the conductive additive and the binder. That is, depending on the composition of the electrode mixture, the rate of change of the internal resistance when the charging rate changes may change. The higher the conductive additive ratio, the lower the internal resistance, and the higher the binder ratio, the higher the internal resistance. Become. The third parameter is the lithium ion conductivity of the electrolyte. That is, depending on the lithium ion conductivity of the electrolyte, the rate of change of internal resistance when the charging rate changes may change. The higher the lithium ion conductivity, the lower the internal resistance, and the lower the lithium ion conductivity. Increases internal resistance. In addition to the first to third parameters, the thickness of the electrode foil, the shape of the electrode tab, the material and structure of the separator also affect the magnitude of the internal resistance.

Exemplifying parameters affecting the setting of the open circuit voltage of the air battery, the first parameter is the partial pressure ratio of the redox gas (for example, hydrogen and water vapor) present on the negative electrode layer side, and the partial pressure ratio of hydrogen is high. The open circuit voltage becomes higher. The second parameter is the oxygen partial pressure existing on the positive electrode layer side, and the higher the oxygen partial pressure, the higher the open circuit voltage. The third parameter is the operating temperature. The higher the operating temperature, the higher the open circuit voltage. The parameters affecting the setting of the internal resistance of the air battery are the same as the first to third parameters.

There are two methods for measuring the internal resistance of the secondary battery, such as a method of measuring AC impedance, and a method of measuring DC resistance from voltage changes before and after the start of charge / discharge. The latter is called a current pause method. Specifically, the voltage of each secondary battery before the start of charging / discharging of the composite battery 22 and the time of a certain time from the start of charging / discharging, for example, each secondary battery after 5 seconds. In this method, the difference from the voltage is divided by the charge / discharge current of each secondary battery.

Next, the structure of the single cell of the composite battery constituting the power storage device of the battery system of the present invention and the structure of the single battery element constituting the single cell will be described. FIG. 5 is a side view schematically showing a stacked state of single battery elements of a lithium ion secondary battery, and FIGS. 6A and 6B are side views schematically showing a stacked state of single battery elements of an air battery. is there.

The high energy type secondary battery 22he is a lithium ion secondary battery, and the high output type secondary battery 22hp is a lithium ion secondary battery having a negative electrode active material using a material different from the high energy type secondary battery 22he. There may be. That is, the high energy type secondary battery 22he and the high energy type secondary battery 22he are both lithium ion secondary batteries and may have negative electrode active materials using different materials.
By setting it as such a structure, the battery system of this invention can comprise a small and lightweight composite battery.

The single cell of the lithium ion secondary battery may have a cylindrical shape. Examples of the cylindrical shape include a 18650 type having a diameter of 18 mm and a length of 65 mm, a 21700 type having a diameter of 21 mm and a length of 70 mm, and a 26650 type having a diameter of 26 mm and a length of 65 mm. In addition, a single cell of a lithium ion secondary battery includes a laminate film in which a resin surface base material, a metal intermediate base material such as aluminum or stainless steel, and a resin sealant material are overlapped, at least a part of the exterior material. The laminate type shape used in the above may be used. Further, the single cell of the lithium ion secondary battery may have a square shape using a plate material obtained by processing aluminum or stainless steel by deep drawing or the like as at least a part of the exterior material.

The positive electrode active material used for the single cell of these cylindrical, laminated, and prismatic lithium ion secondary batteries is not particularly limited. For example, lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, lithium nickel Examples include cobalt manganese oxide (NMC, also referred to as ternary system), lithium nickel cobalt aluminum oxide (also referred to as NCA), and the like. Moreover, the negative electrode active material used for the single cell of the cylindrical type, laminate type, and prismatic lithium ion secondary battery is not particularly limited. For example, low crystalline carbon such as soft carbon or hard carbon, graphite, lithium titanate Etc.

The negative electrode element 62 of the unit cell element 60 of the lithium ion secondary battery includes a negative electrode current collector 62t that is a part of the negative electrode foil 62a and a negative electrode formed on both sides of the negative electrode foil 62a other than the negative electrode current collector 62t. The positive electrode element 64 of the unit cell element 60 is formed on both sides of a portion other than the positive electrode current collector 64t and the positive electrode current collector 64t of the positive electrode foil 64a. Positive electrode active material 64b. Lithium ions stored in the negative electrode element 62 from the positive electrode element 64 through the separator 66 during charging move from the negative electrode element 62 through the separator 66 to the positive electrode element 64 during discharging, and are combined with electrons in the positive electrode element 64. By being reduced to lithium oxide, a current flows from the positive electrode element 64 to the negative electrode element 62 via an external load.

The negative electrode element 62 and the positive electrode element 64 are alternately stacked via the separator 66, and the negative electrode element 62 in which the negative electrode active material 62b is formed on one side or both sides of the negative electrode foil 62a is disposed at both ends in the stacking direction. The positive electrode element 64 in which the positive electrode active material 64b is formed on one side or both sides of the positive electrode foil 64a may be disposed at one end in the stacking direction. The unit cell element 60 may have a structure in which a negative electrode element 62 having a large aspect ratio, a separator 66, and a positive electrode element 64 are stacked in this order and wound in a roll shape. Further, depending on the material, the separator 66 can be integrated with one of the negative electrode element 62 or the positive electrode element 64 by coating, for example, one of the negative electrode active material 62b or the positive electrode active material 64b. .

The high energy type secondary battery 22he is an air battery using air as an active material, and the high power type secondary battery 22hp may be a lithium ion secondary battery.
By setting it as such a structure, since the air battery is lighter than a lithium ion secondary battery, the battery system of this invention can comprise a larger capacity composite battery with the same weight.

The air battery 70 in FIG. 6A includes a positive electrode layer 72 having a porous structure, a negative electrode layer 74, and an electrolyte solution holding layer 76 that holds an organic electrolyte solution between the positive electrode layer 72 and the negative electrode layer 74. Oxygen present therein passes through the porous structure of the positive electrode active material and chemically reacts with metal ions of the negative electrode active material, whereby a current flows from the positive electrode layer 72 to the negative electrode layer 74 via an external load.

As the positive electrode layer 72, for example, a layer that includes a catalyst, a conductive catalyst carrier, and a binder that binds the catalyst and has a porous structure can be applied. Examples of the catalyst include platinum (Pt), ruthenium (Ru), iridium (Ir), rhodium (Rh), palladium (Pd), osmium (Os), tungsten (W), lead (Pb), iron (Fe). Application of metals such as chromium (Cr), cobalt (Co), nickel (Ni), manganese (Mn), vanadium (V), molybdenum (Mo), gallium (Ga), aluminum (Al), and alloys thereof can do. As the conductive catalyst carrier, for example, carbon particles made of carbon black, activated carbon, coke, natural graphite, artificial graphite, or the like can be applied. Further, as the binder, for example, a fluorine resin or an olefin resin can be applied.

The negative electrode layer 74 can be made of a negative electrode active material. Examples of the negative electrode active material include lithium (Li), zinc (Zn), iron (Fe), aluminum (Al), and magnesium (Mg). , Manganese (Mn), silicon (Si), titanium (Ti), chromium (Cr), vanadium (V), and the like, and alloys containing them can be used. As the electrolytic solution retained in the electrolytic solution retaining layer 76, for example, an aqueous solution or a non-aqueous solution of potassium chloride, sodium chloride, potassium hydroxide, or the like can be applied.

The fuel cell 80 in FIG. 6B is classified as an air cell, and includes an electrode assembly 82, a negative electrode fuel material body 84, a heater (not shown), and a sealed container 86. The electrode assembly 82 includes an airtight solid electrolyte body 82a, a positive electrode 82b (also referred to as an air electrode or a cathode), and a negative electrode 82c (also referred to as a fuel electrode or an anode), and includes a positive electrode lead wire 82p and a negative electrode lead wire 82n. Prepare. The sealed container 86 includes the solid electrolyte body 82a or the negative electrode 82c as a part of the wall surface, and seals the negative electrode fuel material body 84. At the time of discharging, the solid electrolyte body 82a conducts oxygen ions, the positive electrode 82b reduces oxygen in the air to oxygen ions, and the negative electrode 82c oxidizes hydrogen gas to water vapor. The negative electrode fuel material body 84 is, for example, iron particles, reacts with water vapor to generate hydrogen gas, and itself becomes an oxide. Due to the reaction during this discharge, a current flows from the positive electrode 82b through the positive electrode lead wire 82p, the load, and the negative electrode lead wire 82n in this order to the negative electrode 82c. The heater is for maintaining the solid electrolyte body 82a and the anode fuel material body 84 at a predetermined temperature or higher. Here, the predetermined temperature is, for example, a temperature necessary for performing a conduction reaction of oxygen ions in the solid electrolyte body 82a or a redox reaction between iron particles and hydrogen gas at a constant rate, It is preferable that it is 400 degreeC or more.

Next, a composite battery group configured by connecting a plurality of composite batteries constituting the power storage device of the battery system of the present invention in series-parallel will be described. FIG. 7 is a block diagram illustrating a composite battery group including the composite battery of FIG.

The composite battery group 90 includes a plurality of composite batteries 22 connected in series and parallel. Each composite battery 22 includes a high energy secondary battery 22he and a high power secondary battery 22hp connected in parallel. The The composite battery constituting the power storage device 20 of the battery system 10 of the present invention is not limited to the composite battery 22, and includes the composite battery group 90. The composite battery group 90 may be used instead of the composite battery 22. it can.
By setting it as such a structure, the battery system of this invention can disperse the risk at the time of a failure.

The battery system according to the first embodiment of the present invention is basically configured as described above. With such a configuration, the battery system of the present invention can guarantee the output performance of the entire composite battery in a wide charging rate region and extend its life, and the battery characteristics of the composite battery according to the usage form Can maintain the performance of each secondary battery at the same level as before, configure a compact, lightweight, larger capacity composite battery, and distribute the risk of failure Can do.

Next, a mobile management system according to a second embodiment of this invention will be described. FIG. 8 is a block diagram showing a mobile object management system according to the second embodiment of the present invention, and FIG. 9 shows the arrangement of the mobile object of the mobile object management system of FIG. 8 and the composite battery constituting the mobile object. It is a side view showing typically.
The mobile management system 100 of the present invention includes a mobile 110 that can move freely, a charging control device 40 of the battery system 10, and a remote monitoring device 50 of the battery system 10. The mobile body 110 is a freight car including small and medium trucks, and includes the power storage device 20 of the battery system 10 of the present invention. The moving body 110 further includes a motor 112 and an inverter 114. The motor 112 generates power for movement with the electric power discharged from the power storage device 20. Inverter 114 is connected between power storage device 20 and motor 112, converts power discharged from power storage device 20 to power, and outputs the converted power to motor 112. The charging control device 40 is installed in a convenience store equipped with the external power source 12, a cargo distribution center, or the like.

The load 116 is supplied with electric power discharged from the power storage device 20, and includes a headlight, a fog lamp, a winker, a wiper, a radiator fan, a starter motor, an air conditioner, and the like. Note that the operating voltage of the load 116 may be the same as that of the power storage device 20, for example, 24V, or may be different from the power storage device 20, for example, 12V or 48V. A DC / DC converter is installed between

Next, a preferable capacity ratio in the present invention will be described.
The composite battery 22 of the power storage device 20 includes, for example, three sub modules 22 hem of the high energy secondary battery 22 he and one sub module 22 hpm of the high output secondary battery 22 hp, For example, it is fixed to the frame of the loading platform. When the discharge power of the composite battery 22 of the moving body 110 is small on average, the remote monitoring device 50 determines that the moving body 110 is traveling in an urban area, and replaces the sub module 22 hpm with the sub module 22 hem. A display notification that displays an instruction to increase is transmitted to the power storage device 20, and the display unit 30 of the power storage device 20 notifies the owner of the power storage device 20 of this instruction. On the contrary, when the discharge power of the composite battery 22 of the moving body 110 increases intermittently, the remote monitoring device 50 determines that the moving body 110 is traveling in a mountainous area, and instead of reducing the submodule 22hem. To the power storage device 20, and the display unit 30 of the power storage device 20 notifies the owner of the power storage device 20 of this instruction. However, the number of submodules 22hpm in the moving body 110 in FIG. 9 is one, and if this is replaced with the submodule 22hem, the number of submodules 22hpm becomes zero and a composite battery cannot be configured. The capacity ratio of the high energy secondary battery 22he of the body 110 cannot be increased by submodule replacement. The moving body 110 may be an electric railway vehicle or an industrial moving body such as a forklift or a port truck.

The mobile management system according to the second embodiment of the present invention is basically configured as described above. By adopting such a configuration, the mobile management system of the present invention can guarantee the output performance of the entire composite battery in a wide charge rate region and extend its life. Battery characteristics can be optimized, and the performance of each secondary battery can be maintained to the same level as before, a compact, lightweight, larger capacity composite battery can be configured, and the risk of failure can be distributed can do.

Next, the solar power generation device management system of the 3rd Embodiment of this invention is demonstrated. FIG. 10A and FIG. 10B are block diagrams showing a solar power generation device management system according to a third embodiment of the present invention.
A solar power generation device management system 120 according to an example of the present invention illustrated in FIG. 10A includes a solar power generation device 130 and a remote monitoring device 50 of the battery system 10. The solar power generation device 130 includes the power storage device 20 and the charge control device 40 of the battery system 10 of the present invention. The solar power generation device 130 further includes at least one solar power generation panel 132, an inverter 134, and a power conversion unit 136. The solar power generation panel 132 generates electric power from solar energy and outputs DC power. The inverter 134 is connected to the solar power generation panel 132, converts the DC power output from the solar power generation panel 132 into AC power, and outputs the AC power to the external circuit 14. The power conversion unit 136 is connected to a connection point 138 between the photovoltaic power generation panel 132 and the inverter 134, converts the power supplied to the connection point 138 to power and outputs the power to the charge control device 40, and the power storage device 20. The power discharged from the power is converted into power and output to the connection point 138.

Next, a preferable capacity ratio in the present invention will be described.
The composite battery 22 of the power storage device 20 includes at least one submodule of the high energy type secondary battery 22he and at least one submodule of the high power type secondary battery 22hp, and is surrounded by the photovoltaic power generation panel 132 or the inverter 134. Placed in. When the discharge power of the composite battery 22 of the power storage device 20 increases on average, the remote monitoring device 50 determines that, for example, a photovoltaic power generation panel 132 has been added, and the submodule 22hpm is not increased or decreased. A display notification for displaying an instruction to increase 22 hem is transmitted to power storage device 20, and display unit 30 of power storage device 20 notifies the owner of power storage device 20 of this instruction. When the discharge power of the composite battery 22 of the power storage device 20 is intermittently increased, the remote monitoring device 50 determines that, for example, a wind power generator is newly installed or added, and increases or decreases the submodule 22hem. The display unit 30 of the power storage device 20 notifies the owner of the power storage device 20 of a display notification that displays an instruction to increase the submodule 22 hpm without transmitting the display notification. In addition, since the composite battery 22 used in the power storage device 20 of the solar power generation device 130 is very high voltage, the voltage of each module of the composite battery 22 is obtained by connecting a lead storage battery to each module of the composite battery 22 in parallel. May be increased in voltage by connecting them in series.

10B includes a photovoltaic power generation apparatus management system 140 according to a modification of the present invention, which includes a photovoltaic power generation apparatus 150 and a remote monitoring apparatus 50 for the battery system 10. The solar power generation device 150 has the same configuration with respect to the solar power generation device 130 except that it has a connection point 152 having a connection position different from that of the connection point 138. Therefore, the description of the same components is omitted. To do.

The power conversion unit 136 is connected to a connection point 152 between the inverter 134 and the external circuit 14, converts the power supplied to the connection point 152 to output to the charge control device 40, and discharges from the power storage device 20. The converted power is converted into power and output to the connection point 152.

The solar power generation device management system according to the third embodiment of the present invention is basically configured as described above. By adopting such a configuration, the photovoltaic power generation apparatus management system of the present invention can ensure the output performance of the entire composite battery in a wide charging rate region and extend its life, and can be combined according to the usage form. The battery characteristics of the battery can be optimized, the performance of each secondary battery can be maintained to the same level as before, the smaller, lighter and larger capacity composite battery can be configured, and the risk of failure Can be dispersed.

Next, specific examples of the present invention will be given to describe the present invention in more detail.
First, as an example, a high-energy secondary battery 1 in which 18650 type single cells of a cylindrical lithium ion secondary battery having a capacity of 2.55 Ah and a nominal voltage of 3.6 V are connected in series and in parallel, a capacity of 3 Ah, A high-power secondary battery 1 in which single cells of a flat-plate laminated lithium ion secondary battery having a voltage of 3.6 V are connected in series and in parallel is connected in parallel to form a composite battery having a total capacity of 18.3 Ah. Next, the open circuit voltage Vhe of the high-energy secondary battery 1 and the open circuit voltage Vhp of the high-power secondary battery 1 at the reference charging rate of 50% and other charging rates were measured.

Next, as a comparative example, a high energy secondary battery 2 in which single cells identical to the single cell of the high energy secondary battery 1 of the embodiment are connected in series 1 and 4 in parallel, a capacity 2 Ah, which is different from the embodiment, A high-power secondary battery 2 in which single cells of a cylindrical lithium ion secondary battery having a nominal voltage of 3.6 V were connected in series and 1 in parallel was connected in parallel to constitute a composite battery having a total capacity of 12.2 Ah. Next, open circuit voltages Vhe and Vhp of each secondary battery at the reference charging rate of 50% and other charging rates were measured.

FIG. 11 is a graph showing the relationship between the charging rate of each secondary battery and the open circuit voltage in an example of the present invention. Moreover, the measurement result at the time of the reference charging rate of 50% and the full charge of the embodiment is shown in the column of the embodiment of Table 1, and the measurement result of the comparative example at the reference charging rate of 50% and the full charge is a comparative example of Table 1. In each column. The open circuit voltage difference in Table 1 is obtained by subtracting the open circuit voltage value at the reference charge rate of 50% from the open circuit voltage value at the time of full charge.

In the composite battery of the example, the open circuit voltage difference 0.6 V of the high-power secondary battery 1 at the time of full charge corresponding to Vdp1 in FIG. 11 is the same as that of the high-energy secondary battery 1 at the time of full charge corresponding to Vde1 in FIG. Since the open circuit voltage difference is larger than 0.43 V, the composite battery of the example satisfies the conditions of the open circuit voltage of the present invention. In the composite battery of the comparative example, the open circuit voltage difference 0.48V of the high-power secondary battery 2 when fully charged corresponding to Vdp2 in FIG. 11 is the high-energy secondary battery when fully charged corresponding to Vde2 in FIG. Since the open circuit voltage difference of 2 is larger than 0.43 V, the composite battery of the comparative example also satisfies the conditions of the open circuit voltage of the present invention.

Next, the internal resistance (DC resistance) when the charging rate of each secondary battery of the example was 50%, 30%, and 10% was measured using the current pause method. Specifically, after fully charging each secondary battery of the example, discharging to a charging rate of 50% at a predetermined current value, voltages Vheb and Vhpb immediately before the end of discharging, and a voltage 10 seconds after the end of discharging. Vhea, Vhpa, discharge currents Ihe, Ihp are measured, and the internal resistance (DC resistance) Rhe of the high-energy secondary battery 1 and the high-power secondary battery 1 when the charging rate is 50% based on the following formula: The internal resistance (DC resistance) Rhp was calculated. A shunt resistor was installed in each of the high energy type secondary battery 1 and the high output type secondary battery 1, and the current flowing through each secondary battery was measured. In addition, since the resistance value of shunt resistance is sufficiently small with respect to the resistance of each secondary battery, it does not affect charging / discharging behavior.
Rhe = (Vhea−Vheb) / Ihe
Rhp = (Vhpa−Vhpb) / Ihp
Next, discharging was performed up to a charging rate of 30% and 10%, and the internal resistances Rhe and Rhp of each secondary battery when the charging rate was 30% and 10% were calculated by the same method.

Next, the internal resistances Rhe and Rhp of each secondary battery when the charging rate of each secondary battery of the comparative example was 50%, 30%, and 10% were calculated by the same method as each secondary battery of the example. . The calculation results of the examples are shown in the example column of Table 2, and the calculation results of the comparative example are shown in the comparison example column of Table 2, respectively. The internal resistance ratio in Table 2 is obtained by dividing the internal resistance value at each charging rate by the internal resistance value when the reference charging rate is 50%.

In the composite battery of the example, the internal resistance ratio 1.31 of the high-power secondary battery 1 when the charging rate is 30% is equal to the internal resistance ratio of the high energy secondary battery 1 when the charging rate is 30%. Since it is larger than 07, the composite battery of the example satisfies the condition of the internal resistance of the present invention. However, in the composite battery of the comparative example, the internal resistance ratio 1.05 of the high-power secondary battery 2 when the charging rate is 30% is the internal resistance ratio of the high energy secondary battery 2 when the charging rate is 30%. Since it is smaller than 1.06, the composite battery of the comparative example does not satisfy the internal resistance condition of the present invention.

<Charge / discharge cycle test>
Next, in order to confirm the effect of the present invention, the high-energy secondary battery 1 and the high-power secondary battery 1 of the example, and the high-energy secondary battery 2 and the high-power secondary battery of the comparative example are used. While measuring the respective voltages and currents of No. 2, step numbers 1 to 3 shown in Table 3 below until the voltage of the composite battery of the example and the voltage of the composite battery of the comparative example reach the end-of-discharge voltage (2.5 V). A charge / discharge cycle test in which 16 charge / discharge patterns were repeatedly loaded was performed. At this time, the C rate was unified in order to fairly evaluate the composite battery of the example having a total capacity of 18.3 Ah and the composite battery of the comparative example having a total capacity of 12.2 Ah.

Next, the charging rate of each secondary battery was calculated by integrating the current flowing through each secondary battery during the charge / discharge cycle test. FIG. 12 is a graph showing the relationship between the number of charge / discharge cycles and the charge rate of each secondary battery in the example of the present invention. In FIG. 12, numerical values are plotted every 5 cycles up to the 30th cycle and every cycle after the 31st cycle in order to show the behavior of the end stage where the charging rate has decreased.

In the composite battery of the example, the charge / discharge pattern can be repeatedly loaded up to 33 times before reaching the end-of-discharge voltage (2.5 V). However, in the composite battery of the comparative example, the high-power secondary battery 2 Since the charging rate is lowered earlier than the charging rate of the high energy type secondary battery 2 and sufficient output cannot be performed at the time of large current discharge in the charge / discharge pattern, it can be repeatedly loaded only 32 times. When the charging rate of the high-power secondary battery 1 becomes 60% or less, the change in the charging rate becomes gentle because the open circuit voltage of the high-power secondary battery 1 is lower than that of the high-energy secondary battery 1. This is because the current balance in the composite battery changes due to the internal resistance ratio being larger than that of the high energy type secondary battery 1, and the current flowing through the high output type secondary battery 1 is reduced. From this result, it is clear that the output performance of the entire composite battery can be secured in a wide charge rate region and the life can be extended by the structure of the composite battery of the example.

As mentioned above, although the battery system of this invention, the mobile body management system provided with the same, and the solar power generation device management system were described in detail by giving embodiment and an Example, this invention is limited to the said embodiment and Example. Of course, various improvements and modifications may be made without departing from the spirit of the present invention.

The battery system of the present invention, the mobile body management system and the solar power generation device management system provided with the battery system can ensure the output performance of the entire composite battery in a wide charging rate region and can extend the life thereof. In addition to the effect that the battery characteristics of the composite battery can be optimized accordingly, maintaining the performance of each secondary battery at least as high as before, configuring a compact, lightweight and larger capacity composite battery, In addition, there is an effect that the risk at the time of failure can be dispersed, which is industrially useful.

DESCRIPTION OF SYMBOLS 10 Battery system 12 External power supply 14 External circuit 20 Power storage device 22 Composite battery 22he High energy type secondary battery 22hem, 22hpm Submodule 22hp High output type secondary battery 24 Detector 26 Transmitter / receiver 28 Discharge controller 28a Discharge circuit 30 Display unit DESCRIPTION OF SYMBOLS 40 Charging control apparatus 42 Reception part 44 Charging control part 44a Charging circuit 50 Remote monitoring apparatus 52 Calculation part 54 Communication part 60 Single cell element 62 Negative electrode element 62a Negative electrode foil 62b Negative electrode active material 62t Negative electrode current collection part 64 Positive electrode element 64a Positive electrode foil 64b Positive electrode active material 64t Positive electrode current collector 66 Separator 70 Air battery 72 Positive electrode layer 74 Negative electrode layer 76 Electrolyte holding layer 80 Fuel cell 82 Electrode complex 82a Solid electrolyte body 82b Positive electrode 82c Negative electrode 82p Positive electrode lead wire 82n Negative electrode lead wire 84 Negative electrode fuel Substance 8 Sealed container 90 Composite battery group 100 Mobile body management system 110 Mobile body 112 Motor 114, 134 Inverter 116 Load 120, 140 Solar power generation apparatus management system 130, 150 Solar power generation apparatus 132 Solar power generation panel 136 Power conversion unit 138, 152 Connection point

Claims (11)

A power storage device including a composite battery that is discharged after being charged with power from an external power source;
A charge control device that is connected between the external power source and the composite battery and controls charging power of the composite battery;
A remote monitoring device for remotely monitoring the state of the composite battery,
The power storage device further includes a detection unit for detecting a state of the composite battery, and transmission / reception for transmitting a detection result of the detection unit to the remote monitoring device and receiving a discharge control notification and a display notification from the remote monitoring device. A discharge control unit that executes the discharge control notification, and a display unit that executes the display notification,
The charging control device includes a receiving unit that receives a charging control notification from the remote monitoring device, and a charging control unit that executes the charging control notification,
The remote monitoring device calculates a preferred usage based on the detection result of the detection unit received from the transmission / reception unit, and calculates the calculation result of the calculation unit as the discharge control notification and the display notification. A transmission unit that transmits to the power storage device and transmits to the charge control device as the charge control notification, and
The composite battery includes a high energy secondary battery having a high weight energy density, a low weight output density, and a large capacity, and a high output secondary battery having a low weight energy density, a high weight output density, and a small capacity. , Configured in parallel,
The state of the composite battery detected by the detection unit includes a voltage value, a charge / discharge current value, and an operating temperature of the composite battery,
The preferable usage method calculated by the calculation unit includes usage conditions of the composite battery, and configuration conditions of the high energy secondary battery and the high output secondary battery constituting the composite battery,
The charge control unit and the discharge control unit control the composite battery so as to satisfy a use condition of the composite battery by executing the charge control notification and the discharge control notification,
The said display part is a battery system which alert | reports the structural conditions of each secondary battery to the owner of the said electrical storage apparatus by performing the said display notification. The use condition of the composite battery includes a charge rate condition, a voltage condition and a charge / discharge current condition of the composite battery,
The remote monitoring device includes a function of causing the charge control unit and the discharge control unit to remotely change a use condition of the composite battery based on a detection result of the detection unit and a calculation result of the calculation unit. The battery system according to 1. The constituent conditions of each secondary battery include the life of each secondary battery, a suitable replacement time, and a suitable capacity ratio of the high energy secondary battery and the high power secondary battery,
Each of the secondary batteries is composed of one submodule or a plurality of submodules connected in parallel to each other, each consisting of a plurality of single cells and one housing.
The remote monitoring device has a function of remotely informing the owner of the power storage device of the configuration condition of each secondary battery based on the detection result of the detection unit and the calculation result of the calculation unit, thereby The power storage device owner replaces a deteriorated submodule to maintain the performance of each of the secondary batteries, and the plurality of the high energy secondary battery and the high power secondary battery. Leave at least one sub-module of one secondary battery having a sub-module, replace the other sub-module with a spare sub-module of the other secondary battery, and change the battery of the composite battery according to the usage form The battery system according to claim 1 or 2, wherein the characteristics are optimized. The high energy type secondary battery has a first open circuit voltage difference obtained by subtracting an open circuit voltage at a reference charge rate arbitrarily set within a charge rate range of 45 to 55% from an open circuit voltage at full charge. And a first internal resistance ratio obtained by dividing an internal resistance value at a charging rate of 25 to 35% by an internal resistance value at the reference charging rate,
The high-power secondary battery has a second open circuit voltage difference obtained by subtracting an open circuit voltage at the reference charge rate from an open circuit voltage at a full charge, and an internal resistance value at a charge rate of 25 to 35%. Having a second internal resistance ratio divided by the internal resistance value at the reference charging rate,
Each open circuit voltage is set such that the second open circuit voltage difference is greater than the first open circuit voltage difference;
The battery system according to any one of claims 1 to 3, wherein each internal resistance is set such that the second internal resistance ratio is larger than the first internal resistance ratio. The high energy type secondary battery is a lithium ion secondary battery, and the high power type secondary battery is a lithium ion secondary battery having a negative electrode active material using a material different from that of the high energy type secondary battery. The battery system according to any one of claims 1 to 4. The high-energy secondary battery is an air battery using air as an active material, and the high-power secondary battery is a lithium ion secondary battery. Battery system. A freely movable movable body comprising the battery system power storage device according to any one of claims 1 to 6,
A charge control device of the battery system;
A remote monitoring device for the battery system,
The moving body further includes:
A motor that generates power for movement with the electric power discharged from the power storage device;
A moving body management system comprising: an inverter connected between the power storage device and the motor, and converting the power discharged from the power storage device into power and outputting the power to the motor. A solar power generation apparatus comprising the battery device and the charge control device of the battery system according to any one of claims 1 to 6,
A remote monitoring device for the battery system,
The solar power generation device further includes:
At least one photovoltaic power generation panel that generates power from solar energy and outputs DC power;
An inverter connected to the photovoltaic power generation panel and converting the DC power output by the photovoltaic power generation panel into AC power and outputting the AC power to an external circuit;
Connected to a connection point between the photovoltaic power generation panel and the inverter or between the inverter and the external circuit, and converts the power supplied to the connection point to output to the charge control device, A solar power generation device management system comprising: a power conversion unit that converts power discharged from the power storage device into power and outputs the power to the connection point. A high energy secondary battery with a high weight energy density, a low weight output density, and a large capacity is connected in parallel with a high energy secondary battery with a low weight energy density, a high weight output density, and a small capacity. Configured
The high energy type secondary battery has a first open circuit voltage difference obtained by subtracting an open circuit voltage at a reference charge rate arbitrarily set within a charge rate range of 45 to 55% from an open circuit voltage at full charge. And a first internal resistance ratio obtained by dividing an internal resistance value at a charging rate of 25 to 35% by an internal resistance value at the reference charging rate,
The high-power secondary battery has a second open circuit voltage difference obtained by subtracting an open circuit voltage at the reference charge rate from an open circuit voltage at a full charge, and an internal resistance value at a charge rate of 25 to 35%. Having a second internal resistance ratio divided by the internal resistance value at the reference charging rate,
Each open circuit voltage is set such that the second open circuit voltage difference is greater than the first open circuit voltage difference;
Each internal resistance is a composite battery set such that the second internal resistance ratio is larger than the first internal resistance ratio. The high energy type secondary battery is a lithium ion secondary battery, and the high power type secondary battery is a lithium ion secondary battery having a negative electrode active material using a material different from that of the high energy type secondary battery. The composite battery according to claim 9. 10. The composite battery according to claim 9, wherein the high energy type secondary battery is an air battery using air as an active material, and the high power type secondary battery is a lithium ion secondary battery.

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