TWI623123B - Charge monitoring device for series battery pack - Google Patents

Abstract

A charging monitoring device for a series battery pack, the series battery pack is composed of a plurality of battery cells connected in series, the charging monitoring device has a plurality of monitoring modules respectively connected to one of the battery cells, each of the monitoring modules respectively having a The simulation load, the detection unit that measures the energy storage state of the battery unit to generate a stored energy state data, and a determination unit that connects the analog load and the detection unit and stores a battery normal charging data. Each of the determining units can respectively compare one of the energy storage state data and one of the battery normal charging materials by a program control manner to determine whether one of the analog loads is enabled to discharge one of the battery cells. This problem solves the problem that the conventional structure cannot monitor each battery separately.

Description

Charge monitoring device for series battery pack

The invention relates to a charging monitoring device for a series battery pack, in particular to a charging monitoring device capable of monitoring the energy storage state of the battery cells in a series state of a plurality of battery cells to maintain the charging balance.

With the rapid development of today's electronic technology, high-voltage series battery packs have been widely used in electric vehicles, hybrid vehicles and industrial backup batteries. In detail, since the manufacturing state of each battery cell in the series battery pack is slightly different, the series battery pack is relatively easy to charge a part of the battery cells due to manufacturing differences between the battery cells during charging. Some of the battery units are too slow to charge. Under such conditions, some of the battery units that have been charged will be forced to continue charging due to some of the battery units that have not been charged, thereby causing damage to some of the battery units that have been charged.

In order to solve the problem that the series battery pack has uneven charging in the series state due to the difference in manufacturing of the battery cells, various manufacturers have gradually developed related solutions. For example, the Patent Publication No. I538348 discloses a battery balancing load control unit that can charge balance a first battery unit and a second battery unit connected in series with each other. The first battery unit has a first positive end and a first negative end, and the second battery unit has a second positive end and a second negative end. The battery balancing load control unit includes a balance module and a comparison. Circuit and a balance judgment circuit. When the battery balancing load control unit is actually used, the comparison circuit detects the first battery unit and the second battery unit to obtain a detection signal, and further determines the detection signal and a balanced reference signal. The potentials are compared to output a comparison result signal to the balance determination circuit. Then, the balance determining circuit determines whether the change of the comparison result signal state continues for more than a predetermined determination time. If yes, the balance determining circuit controls the battery of the first battery unit and the second battery unit to have a higher battery. The voltage person releases part of the power or current to the balancing module, thereby achieving a charging balance of the first battery unit and the second battery unit in series.

Moreover, the Patent No. I511413 patent of the Republic of China also discloses a device for actively balancing control by means of voltage information sharing, the device comprising a power supply device having a plurality of power supply modules, the power supplies The module has a plurality of battery modules connected in series with each other, and each of the battery modules has a battery unit. In addition, the device further includes a specific battery module, a voltage information sharing port, and a judging circuit. The specific battery module is one of the battery modules, the active balancing circuit is electrically connected to the specific battery module, and the voltage information sharing is disposed in a specific power supply mode of the power supply modules. The voltage information sharing is electrically connected to the other battery modules, and the determining circuit is electrically connected to the specific battery module, the active balancing circuit, and the voltage information sharing. When the device is in actual use, the determining circuit can obtain a first voltage information from the specific battery module and obtain a second voltage information from the other battery modules by the voltage information sharing, and then according to the first voltage information and The second voltage information determines whether to drive the active balancing circuit to charge balance the particular battery module.

However, it can be seen from the description of the I538348 and I511413 patents that Figures 1 to 11 of the I538348 patent clearly show that the battery balanced load control unit is through analog power. The first battery unit and the second battery unit are charged and balanced. Figures 1 to 9 of the I511413 patent also clearly show that the device is charged and balanced by the analog circuit. It can be seen that the charging devices of the I538348 and I511413 patents cannot monitor and discharge the charging state of each battery, that is, the charging device of the second case cannot be controlled by the program at any time and regularly. In order to monitor the charge balance of each battery, each battery must be separately detected when the series is disconnected, and the charging operation of each battery in the series state may also have a problem of charging imbalance.

The main object of the present invention is to solve the problem that the conventional structure cannot monitor the status of each battery separately in the battery series state, and there is a problem of charging imbalance.

In order to achieve the above object, the present invention provides a charging monitoring device for a series battery pack, which is charged by receiving power provided by a power supply unit having a plurality of sequentially connected battery cells, the charging monitoring device The charging monitoring device has a plurality of monitoring modules, each of the monitoring modules being independently connected to one of the battery units, each of the monitoring modules having a selective start and a battery The analog load connected in parallel with the unit, a detecting unit connected to one of the battery units and measuring the energy storage state of the battery unit to generate an energy storage state data, and a connection with the analog load and the detecting unit a judging unit for normal charging data of the battery, each of the judging units respectively comparing one of the energy storage state data with one of the normal charging data of the battery, and if the comparison is normal, one of the simulated loads is disabled, if the comparison is abnormal One of the analog loads is enabled to cause one of the battery cells to discharge one of the analog loads.

In an embodiment, each of the determining units respectively compares one of the energy storage state data When one of the batteries is normally charged, if the comparison is abnormal, adjusting the impedance value of one of the analog loads causes one of the battery units to discharge according to the impedance value of one of the simulated loads. Further, each of the analog loads is a dummy load or an electronic load, and each of the monitoring modules has an electrical connection between the determining unit and one of the analog loads and the analog load impedance value can be adjusted. Load control unit. Wherein each of the analog loads is a MOSFET control load.

In one embodiment, each of the energy storage state data includes a charging current value of one of the battery cells and a charging voltage value of one of the battery cells, and each of the detecting units has one of detecting one of each The current detector of the battery unit charging current value and a voltage detector for detecting a charging voltage value of one of the battery units.

In one embodiment, each of the energy storage state data includes a charging current value of one of the battery cells or a charging voltage value of one of the battery cells, and each of the detecting units has one of detecting one of each The current detector of the battery unit charging current value or a voltage detector for detecting the charging voltage value of one of the battery units.

In one embodiment, the charging monitoring device has a battery that is electrically connected to each of the monitoring modules and is configured with each of the battery normal charging materials for each of the determining units to obtain one of the normal charging data of the battery. Control unit.

In one embodiment, the charging monitoring device has a plurality of isolation units electrically connected between the battery unit and the main control unit to isolate the main control unit when one of the battery units is burned.

In one embodiment, the charging monitoring device has an electrical connection to each of the battery unit and the main control unit to avoid the main control unit, and the main unit is isolated when any of the battery units are burned out. The isolation unit of the control unit.

In one embodiment, the main control unit is a single wafer microprocessor.

Through the above embodiments of the present invention, the following features are compared with the conventional ones:

The present invention enables each of the monitoring modules to continuously determine the energy storage state of one of the battery cells through one of the detecting units and one of the determining units, and respectively disables the energy storage state of each of the battery cells. Or enabling one of the analog loads, thereby separately monitoring the discharge action of each of the battery cells to maintain a normal state of charge, such that the battery cells can maintain charge balance in a series state. The charging monitoring device is configured to discharge the battery cells through the analog loads, so that the monitoring modules can separately balance the charging state of one of the battery cells by using a program setting manner. In this way, it is possible to solve the problem that the conventional structure cannot monitor the status of each battery separately and there is a problem of charging imbalance.

1‧‧‧Monitoring module

11‧‧‧simulated load

12‧‧‧Detection unit

13‧‧‧judging unit

14‧‧‧Load Control Unit

2‧‧‧Series battery pack

21‧‧‧ battery unit

3‧‧‧Power supply unit

4‧‧‧Master unit

5‧‧‧Isolation unit

Figure 1 is a block diagram of the circuit of the present invention.

2 is a circuit block diagram of a monitoring module of the present invention.

Figure 3 is a block diagram of a circuit in the practice of the present invention.

4 is a block diagram showing the circuit of the monitoring module of the present invention.

FIG. 5 is a block diagram of a circuit of a monitoring module according to an embodiment of the invention.

FIG. 6 is a block diagram of a circuit of a monitoring module according to another implementation of the present invention.

The detailed description and technical contents of the present invention will now be described as follows:

Referring to FIG. 1 and FIG. 2, the present invention provides a charging monitoring device for a series battery pack. Each of the monitoring modules 1 has an analog load 11, a detecting unit 12, and a determining unit 13. If the composition of the monitoring module 1 is single, the analog load 11 and the detecting unit 12 are both It is electrically connected to the judging unit 13. Specifically, the analog load 11 can be a dummy load (for example, a MOSFET control load) or an electronic load. The monitoring module 1 can include a load control unit 14, as shown in FIG. 5. As shown, the load control unit 14 can be disabled by the determination unit 13 to disable or enable the analog load 11, and the load control unit 14 can be used to adjust the impedance of the analog load 11 when the analog load 11 is enabled. value. In one embodiment, the detecting unit 12 has a current detector and a voltage detector, and the detecting unit 12 can be operated by the determining unit 13 to detect the current value of the electronic component and In another implementation, the detecting unit 12 has a current detector or a voltage detector, and the detecting unit 12 can be operated through the determining unit 13 to detect the current value of the electronic component or Voltage value.

The implementation of the charging monitoring device can be understood from the above technical content. Here, the present invention will further explain the use process of the charging monitoring device and the implementation manner generated by the use process. In detail, referring to FIG. 1 and FIG. 2, the series battery pack 2 includes a plurality of battery cells 21 connected in series, and the battery cells 21 are electrically connected to a power supply unit 3, and the power supply unit 3 Power can be supplied to the battery cells 21 in a series state of the battery cells 21 for charging operation, as shown in FIG. In addition, if the connection relationship between the charging monitoring device and the series battery pack 2 is known, each of the monitoring modules 1 is independently connected to one of the battery units 21, wherein each of the analog loads 11 and one of the analog loads 11 respectively The battery cells 21 are connected in parallel, and each of the detecting units 12 is connected in parallel with one of the battery cells 21, respectively, according to which each of the battery cells 21 can pass through one of the analog negatives in a subsequent process. The load 11 is discharged, and each of the detecting units 12 can respectively measure the energy storage state of one of the battery cells 21. The charging monitoring device can charge and balance one of the battery cells 21 by each of the monitoring modules 1 when the battery cells 21 are connected in series. The charging unit 12 measures the energy storage state of the battery unit 21 to generate an energy storage state data (eg, from a single monitoring process of the battery unit 21). The battery unit 21 has at least one of a charging current value and a charging voltage value. Then, the determining unit 13 compares the energy storage state data with a battery normal charging data (eg, the battery unit 21 at each charging time point). The corresponding ideal charging current value or the ideal charging voltage value corresponding to each charging time point is compared. If the comparison is normal, the battery unit 21 is in a normal charging state, and the determining unit 13 disables the The load 11 is simulated to prevent the battery unit 21 in a normal state of charge from discharging the analog load 11; if the comparison is abnormal, the battery unit 21 is in an abnormally charged state, and the determining unit 13 enables the analog load. 11. The battery unit 21 is caused to discharge one of the analog loads 11 so that the battery unit 21 in an abnormally charged state is maintained in a normal state of charge. In this way, each of the monitoring modules 1 can continuously determine the energy storage state of one of the battery cells 21 through one of the detecting units 12 and one of the determining units 13 respectively, and further according to each of the battery cells 21 The energy storage state is used to disable or enable one of the simulated loads 11 respectively. The charging monitoring device is configured to discharge the battery cells 21 through the analog loads 11 so that the monitoring modules 1 can respectively charge one of the battery cells 21 by a programmed manner. The state is balanced, thereby solving the problem that the conventional structure cannot monitor the status of each battery separately and has a charging imbalance condition.

In more detail, the charging monitoring device can have a main control unit 4 as shown in FIG. 3 and FIG. 4, the main control unit 4 is a single-chip microprocessor, and each of the monitoring modules 1 is Electrical connection Connected to the main control unit 4. The single-chip microprocessor (ie, the main control unit 4) can be configured to control an application of each monitoring module 1 monitoring mode (eg, monitoring time and specific values of the normal charging data of the batteries, etc.) . According to the action relationship between the main control unit 4 and the single monitoring module 1 and the single battery unit 21, the monitoring module 1 can be at each predetermined time according to the monitoring mode set by the main control unit 4. The battery unit 21 is monitored. Further, the normal charging data of the battery is also set to the main control unit 4, and the normal charging data of the battery includes the normal charging history of the battery unit 21 (eg, the ideal charging current corresponding to each charging time point). The value or the ideal charging voltage value corresponding to each charging time point), the determining unit 13 may determine whether the energy storage state data of the battery unit 21 is compared with the battery unit 21 at each predetermined time point according to the normal charging data of the battery. The analog load 11 is enabled. Here, it should be noted that, when the determining unit 13 enables the analog load 11 when the energy storage state data is abnormal with the battery normal charging data, the determining unit 13 adjusts the load control unit 14 through the load control unit 14. The magnitude of the impedance value of the analog load 11 is thereby controlled to control the amount of discharge of the battery unit 21 so that the energy storage state of the battery unit 21 can conform to the normal charging data of the battery. Further, in view of the fact that the battery unit 21 may have a large voltage capacity and has a large charging current, the charging monitoring device of the present invention may also have a plurality of parallel connection in the battery unit 21 according to the charging current of the battery unit 21. The monitoring module 1 (the monitoring modules 1 are also connected in parallel with each other), thereby increasing the shunting path when the battery unit 21 is discharged, so that the charging monitoring device can be adapted to charge the series battery pack 2 with a large voltage capacity. Balance the work. In this embodiment, the monitoring module 1 can perform the setting of the monitoring mode only by the single main control unit 4, and in another embodiment, the monitoring modules 1 can pass through a plurality of different The main control unit 4 performs setting of the monitoring mode.

The battery unit 21 is discharged to one of the analog loads 11 respectively. In an embodiment, each of the monitoring modules 1 further has a temperature monitoring unit (not shown) and a fan (not shown), each of the temperature monitoring units. The temperature of one of the battery cells 21 can be separately measured, and one of the fans is driven to dissipate heat from one of the battery cells 21 when the temperature of the battery cell 21 exceeds a normal temperature upper limit. In addition, in view of the fact that the battery unit 21 may be burnt due to abnormal manufacturing structure or abnormal charging state, in an embodiment, as shown in FIG. 6, the charging monitoring device has a plurality of isolation units 5, FIG. 6 is only a single one of the isolation unit 5 and related to each other. Each of the isolation units 5 is electrically connected to one of the monitoring module 1 and the main control unit 4, and the isolation units 5 are respectively respectively When one of the battery units 21 is burned, the main control unit 4 is isolated. In another embodiment, the charging monitoring device has a single isolation unit 5, and the isolation unit 5 is electrically connected between each of the monitoring module 1 and the main control unit 4. The isolation unit 5 can be any The main control unit 4 is isolated when the battery unit 21 is burned. Specifically, the isolation unit 5 has a power isolation circuit and a signal isolation circuit (eg, an I2C isolator). The power isolation circuit can be used to isolate the voltage, and the signal isolation circuit can be used to isolate the signal.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Variations and modifications are still within the scope of the patents of the present invention.

Claims (10)

A charging monitoring device for a series battery pack, the series battery pack is charged by receiving power provided by a power supply unit, wherein the series battery pack has a plurality of battery units connected in series, and the charging monitoring device is characterized in that: the charging monitoring device Having a plurality of monitoring modules, each of the monitoring modules being independently connected to one of the battery units, each of the monitoring modules having a simulated load selectively connected to one of the battery units, and One of the battery cells is connected in parallel and has a measuring unit for measuring the energy storage state of the battery cell to generate an energy storage state data, and a determining unit connected to the analog load and the detecting unit and storing a normal charging data of the battery Each of the judging units respectively compares one of the energy storage state data with one of the normal charging data of the battery. If the comparison is normal, one of the simulated loads is disabled, and if the comparison is abnormal, one of the simulated loads is enabled. One of the battery cells is discharged to one of the analog loads. The charging monitoring device of the serial battery pack according to claim 1, wherein each of the determining units respectively compares one of the energy storage state data and one of the battery normal charging materials, and if one of the abnormalities is abnormal, adjust one of the The impedance value of the analog load causes one of the battery cells to discharge according to the impedance value of one of the analog loads. The charging monitoring device of the serial battery pack according to claim 2, wherein each of the analog loads is a dummy load or an electronic load, and each of the monitoring modules has an electrical connection to the determining unit and one of the monitoring modules. The load control unit between the simulated loads and the analog load impedance value can be adjusted. The charging monitoring device of the series battery pack according to claim 3, wherein each of the analog loads is a MOSFET control load. The charging monitoring device of the series battery pack according to claim 1, 2, 3 or 4, wherein each of the energy storage state data respectively includes a charging current value of one of the battery cells and a charging voltage of one of the battery cells Each of the detecting units has a current detector that detects one of the battery unit charging current values and a voltage detector that detects one of the battery unit charging voltage values. The charging monitoring device of the series battery pack according to claim 1, 2, 3 or 4, wherein each of the energy storage state data respectively includes a charging current value of one of the battery cells or a charging voltage of one of the battery cells Each of the detecting units has a current detector that detects one of the battery unit charging current values or a voltage detector that detects one of the battery unit charging voltage values. The charging monitoring device of the serial battery pack according to claim 1, 2, 3 or 4, wherein the charging monitoring device has an electrical connection to each of the monitoring modules and is configured with each of the battery normal charging materials for Each of the determining units respectively obtains one of the main control units of the normal charging data of the battery. The charging monitoring device of the serial battery pack according to claim 7, wherein the charging monitoring device has a plurality of electrically connected between the monitoring module and the main control unit, and is isolated when one of the battery units is burned out. The isolation unit of the main control unit. The charging monitoring device of the serial battery pack according to claim 7, wherein the charging monitoring device has an electrical connection to each of the monitoring module and the main control unit to avoid the main control unit and obtain the battery The isolation unit of the main control unit is isolated when the unit is burned. The charging monitoring device of the series battery pack according to claim 7, wherein the main control unit is a single wafer microprocessor.