JP2018148643A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device capable of more reliably charging a power supply provided with a service plug device at an allowable current value or less. A power supply circuit 20 including a battery 23 for a vehicle, an interlock circuit 30, and a service plug device 40 capable of interrupting the power supply circuit 20 and the interlock circuit 30 are provided. The circuit includes a conducting portion 41 that constitutes a part of the circuit 20 and can shut off the power supply circuit 20, and a first resistor 31 that constitutes a part of the interlock circuit 30. The first resistor 31 is a conducting portion. It has a resistance value corresponding to the allowable current value of 41. A second resistor 32 is provided in the interlock circuit 30, and the resistance value of the first resistor 31 is detected from the partial pressure applied to the second resistor 32, and based on the resistance value and a predetermined map. To detect the allowable current value. Further, when the preset allowable current value and the detected allowable current value are different, control is performed not to charge the battery 23. [Selection diagram] Figure 1

Description

  The present invention relates to a power supply device including a power supply mounted on a vehicle and a service plug device attached to the power supply.

  The electric vehicle includes a plurality of batteries connected in series as a power source, and a high voltage circuit for supplying electric power from the battery to a load and charging the battery. In such a high voltage circuit, an allowable current value that can be energized is determined by the diameter of the harness wire that constitutes a part of the high voltage circuit.

  Usually, a control device that performs charge control of a power supply is set in advance with an allowable current value of a high voltage circuit, and performs charge control of the power supply so as not to exceed the allowable current value (for example, Patent Document 1). reference). Since the wire diameter of the harness wire varies depending on the vehicle type, the allowable current value also varies depending on the vehicle type. For this reason, the control apparatus which performs charge control sets the allowable current value which changes for every vehicle model.

  However, in consideration of the possibility that a permissible current value different from the actual permissible current value is set in the control device, it is desirable to take measures to charge the power supply with a more accurate permissible current value.

  Further, the battery is provided with a service plug device for blocking in order to ensure safety during maintenance. The service plug device includes a conduction portion that becomes a part of the high-voltage circuit. When the service plug device is removed from the battery, the conducting portion is adapted to interrupt the high voltage circuit. An allowable current value is also determined for the conduction portion of such a service plug device. For this reason, the control device that performs the charge control performs the charge control of the power supply so as not to exceed the allowable current value of the service plug device.

  However, in consideration of the possibility that the allowable current value set in the control device is different from the allowable current value of the service plug device, it is desirable to take measures to charge the power supply more accurately and with an accurate allowable current value.

JP 2012-249410 A

  This invention is made | formed in view of such a situation, and it aims at providing the power supply device which can charge the power supply provided with a service plug apparatus more reliably below an allowable current value.

  According to a first aspect of the present invention for solving the above problems, a first electric circuit including a vehicle battery, a second electric circuit electrically independent of the first electric circuit, and the first electric circuit are provided. And a service plug device capable of shutting off the second electrical circuit. The service plug device forms part of the first electrical circuit and can shut off the first electrical circuit. And a first resistor constituting a part of the second electric circuit, wherein the first resistor has a resistance value corresponding to an allowable current value of the conduction portion. It is in the power supply.

  In the first aspect, the allowable current value is not obtained directly from the first electric circuit, and the allowable value is determined from the resistance value of the first resistor of the second electric circuit that is electrically independent of the first electric circuit. The current value can be acquired. Thus, it is not necessary to add a configuration for acquiring the allowable current value to the first electric circuit, and the first electric circuit including the battery is independent of the first electric circuit, so that the allowable current value can be acquired more safely. can do. And it can use for the control which charges the battery in the said allowable electric current value below an allowable electric current value.

  According to a second aspect of the present invention, in the power supply device according to the first aspect, the second electric circuit can detect that the service plug device has cut off the first electric circuit. The power supply device is an interlock circuit.

  In the second aspect, the interlock circuit for monitoring insertion / extraction of the service plug device is also used as a circuit for acquiring the allowable current value of the conduction portion of the service plug device. Thereby, it is not necessary to provide a dedicated circuit for acquiring the allowable current value, and the apparatus configuration can be simplified.

  According to a third aspect of the present invention, in the power supply device according to the first or second aspect, the second electric circuit is supplied with electric power from an auxiliary battery.

  In the third aspect, since the auxiliary battery is also used as the power source for the second electric circuit, there is no need to prepare a power source for the second electric circuit, reducing the cost and simplifying the device configuration. Can do.

  According to a fourth aspect of the present invention, in the power supply device according to any one of the first to third aspects, the power supply device includes a detection unit that detects the allowable current value, and the detection unit includes the second electric circuit. A map of a second resistance constituting a part of the first resistance, a resistance value of the first resistance, and the allowable current value corresponding to the resistance value, and from the divided voltage applied to the second resistance, The power supply device is characterized by detecting a resistance value of a first resistor and detecting the allowable current value from the detected resistance value of the first resistor and the map.

  In the fourth aspect, the resistance value of the first resistor provided in the service plug device can be easily obtained on the detection unit side.

  According to a fifth aspect of the present invention, in the power supply device according to any one of the first to fourth aspects, the allowable current value obtained from the resistance value of the first resistor, and the preset preset value When the allowable current value is different, the power supply device includes a charge control unit that does not charge the battery.

  In the fifth aspect, even when the service plug device is incorrectly installed or the allowable current value preset in the charge control unit is erroneously set, the battery is prevented from being charged with the incorrect allowable current value. As a result, the battery can be charged more reliably at an allowable current value or less.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply device which can charge the power supply provided with a service plug apparatus more reliably below an allowable current value is provided.

It is the schematic which shows the circuit structure of the power supply device which concerns on this embodiment. It is a block diagram of a control device concerning this embodiment.

  Hereinafter, modes for carrying out the present invention will be described. In addition, description of embodiment is an illustration and this invention is not limited to the following description.

<Embodiment 1>
Although not particularly illustrated, the power supply device according to the present embodiment is mounted on an electric vehicle as an example of the vehicle. The electric vehicle may be an electric vehicle including only an electric motor as a power source for traveling, or may be a hybrid vehicle using both an engine and an electric motor.

  FIG. 1 is a schematic diagram illustrating a circuit configuration of a power supply device according to the present embodiment. The power supply device 10 according to the present embodiment includes a power supply circuit 20 that is an example of a first electric circuit, an interlock circuit 30 that is an example of a second electric circuit, a service plug device 40, and a control device 50. I have.

  The power supply circuit 20 is an electric circuit including a battery 23 including a first battery 21 and a second battery 22 connected in series. The power supply circuit 20 has a circuit configuration in which the positive electrode of the first battery 21 and the negative electrode of the second battery 22 are each connected to the charger 60 by a harness wire 26. The charger 60 is a device that charges the battery 23 with an allowable current value or less notified from the control device 50.

  With such a power supply circuit 20, power is supplied from the charger 60 to the battery 23, and the battery 23 is charged. Although not particularly shown, the power supply circuit 20 is connected to a load (not shown) via a contactor or the like (not shown). The load is a device such as a traveling electric motor or an air conditioner, and power is supplied from the battery 23 to the load via the power supply circuit 20. In addition, although the 1st battery 21 and the 2nd battery 22 are comprised by the lithium ion battery, there is no limitation in particular in the kind of battery.

  The power supply circuit 20 is provided with two terminals 24 between the first battery 21 and the second battery 22. A service plug device 40 that shuts off the power supply circuit 20 is attached to the terminal 24.

  The interlock circuit 30 is an electric circuit that is electrically independent of the power supply circuit 20 and is a circuit that can detect that the service plug device 40 has shut off the power supply circuit 20. Such an interlock circuit 30 is provided with a first resistor 31, a second resistor 32, and an auxiliary battery 33. These are used to detect the allowable current value of the power supply circuit 20 and the like, and details will be described later. The auxiliary battery 33 is a battery provided separately from the battery 23 for driving the electric motor, and is used for purposes such as a power source for starting the hybrid system. In the present embodiment, such an auxiliary battery 33 is also used as a power source for the interlock circuit 30. As a result, it is not necessary to prepare a power supply for the interlock circuit 30, reducing the cost and simplifying the device configuration.

  The service plug device 40 is a device that can shut off the power supply circuit 20 and the interlock circuit 30. Specifically, the service plug device 40 includes a conduction part 41 that constitutes a part of the power supply circuit 20 and can shut off the power supply circuit 20. Further, the service plug device 40 includes a first resistor 31 that constitutes a part of the interlock circuit 30. The conduction part 41 and the first resistor 31 are housed in a case 42. The case 42 can be attached to a battery case (not shown) that houses the battery 23.

  In a state where the service plug device 40 is attached to the battery case of the battery 23, the conducting portion 41 is conducted to the two terminals 24, and the power supply circuit 20 becomes a closed circuit. In this state, the interlock circuit 30 is also a closed circuit.

  In a state where the service plug device 40 is removed from the battery case of the battery 23, the conduction portion 41 is electrically disconnected from the two terminals 24, and the power supply circuit 20 is shut off. In this state, the interlock circuit 30 is also shut off.

  In the power supply circuit 20 described above, the allowable current value that can be energized is determined by the wire diameter of the harness wire 26. The allowable current value is also determined for the conduction portion 41 of the service plug device 40 that is a part of the power supply circuit. Usually, the allowable current value of the power supply circuit 20 and the allowable current value of the conducting portion 41 are the same value.

  The first resistor 31 has a resistance value corresponding to the allowable current value of the conducting portion 41. For example, if the allowable current value of the conduction part 41 is 10A, the resistance value of the first resistor 31 is 10Ω, and if the allowable current value of the conduction part 41 is 100A, the resistance value of the first resistor 31 is 100Ω. ing. The resistance value corresponding to the allowable current value is not limited to such a specific example. The resistance value may be determined so that at least the allowable current value and the resistance value are in a one-to-one relationship.

  The second resistor 32 is a resistor constituting a part of the interlock circuit 30 and is provided in the control device 50. The second resistor 32 is provided to read the resistance value of the first resistor 31 as will be described in detail later. The resistance value of the second resistor 32 is not particularly limited.

  The control device 50 has a charge control function that reads the allowable current value of the conduction unit 41 and causes the charger 60 to charge the battery 23 below the allowable current value. The control device 50 also has a function of monitoring the interlock circuit 30, detecting insertion / extraction of the service plug device 40, and performing a predetermined process. Such a control device 50 is configured by a microcomputer (also referred to as an ECU) including various sensors, a central processing unit, and a main storage device.

  FIG. 2 is a block diagram of the control device. The control device 50 includes a detection unit 51 and a charge control unit 52.

  The detection unit 51 detects the allowable current value of the conduction unit 41 of the service plug device 40. Specifically, the detection unit 51 includes a second resistor 32 (see FIG. 1) and a map that constitute a part of the interlock circuit 30.

  The map is data obtained by combining the resistance value of the first resistor 31 and the allowable current value of the conduction portion 41 corresponding to the resistance value. Such a map is stored in advance in the storage device of the control device 50. The detection unit 51 detects the allowable current value as follows using such a map.

  In the present embodiment, the interlock circuit 30 has an auxiliary battery 33 as a DC power source, and a first resistor 31 and a second resistor 32 are connected in series. The voltage of the auxiliary battery 33 and the resistance value of the second resistor 32 are stored in advance in the storage device.

  The detection unit 51 detects the partial pressure applied to the second resistor 32. This is obtained by a known circuit configuration. Then, the resistance value of the first resistor 31 is obtained by calculation from the divided voltage of the second resistor 32, the resistance value of the second resistor 32, and the voltage applied to the interlock circuit 30 (voltage of the auxiliary battery 33). Then, the detection unit 51 reads the allowable current value corresponding to the resistance value of the first resistor 31 from the map.

  In this way, the detection unit 51 can detect the allowable current value of the conduction unit 41 provided in the service plug device 40 via the interlock circuit 30.

  The charge control unit 52 acquires the allowable current value from the detection unit 51. Hereinafter, the allowable current value obtained from the detection unit 51 is referred to as a detection value. On the other hand, the charge control unit 52 has an allowable current value set in advance. The allowable current value is common to both the power supply circuit 20 and the conduction part 41. Hereinafter, this allowable current value is referred to as a set value.

  The charge control unit 52 obtains a detection value from the detection unit 51 and compares it with the set value. If they are the same value as a result of the comparison, the battery 23 is notified of the allowable current value. In addition, you may consider that it is the same value when the difference of a detected value and a setting value is below a predetermined threshold value. On the other hand, as a result of the comparison between the detected value and the set value, the charge control unit 52 does not notify the battery 23 of the allowable current value if they are different values.

  When the allowable current value is notified from the charging control unit 52, the charger 60 charges the battery 23 below the allowable current value. On the other hand, the charger 60 does not charge the battery 23 unless an allowable current value is notified from the charge control unit 52.

  The operation of the power supply apparatus 10 having the above configuration will be described. First, the power supply circuit 20 has an allowable current value corresponding to the wire diameter of the harness wire 26. The service plug device 40 also has a conduction portion 41 that matches the allowable current value of the power supply circuit 20.

  Therefore, when an appropriate service plug device 40 is attached to the power supply circuit 20, the allowable current value of the conduction unit 41 of the service plug device 40, the allowable current value of the power supply circuit 20, and the charge control unit 52 of the control device 50 are set. The allowed allowable current value (set value) matches. In this case, since the allowable current value (detected value) of the conduction unit 41 detected by the detection unit 51 matches the set value, the power supply device 10 can cause the charger 60 to charge at or below the allowable current value.

  On the other hand, when an inappropriate service plug device 40 is attached to the power supply circuit 20, the allowable current value (for example, 10A) of the conduction portion 41 of the service plug device 40 and the allowable current value (for example, 20A) of the power supply circuit 20 do not match. It becomes. In this case, if the set value (for example, 20A) is set correctly according to the allowable current value of the power supply circuit 20, the set value (20A) and the detected value (10A) are different. You can not let it.

  In addition, even when an appropriate service plug device 40 is attached to the power supply circuit 20 and the allowable current value (for example, 20A) of the conduction portion 41 matches the allowable current value (for example, 20A) of the power supply circuit 20, charging is performed. There is a possibility that a setting value to be set in the control unit 52 is erroneously set (for example, 15A). In this case, since the set value (15A) and the detected value (20A) are different, the charger 60 cannot be charged.

  As described above, according to the power supply device 10 having the above-described configuration, the battery 23 is charged with an incorrect allowable current value even when the service plug device 40 is incorrectly installed or the setting value is set incorrectly. As a result, the battery 23 can be charged more reliably at an allowable current value or less.

  Here, in order to detect whether the set value set in the charge control unit matches the actual allowable current value of the power supply circuit 20, it is conceivable to acquire the allowable current value directly from the power supply circuit 20. However, since the power supply circuit 20 is a high-voltage circuit and is connected to the charger 60 and various loads, an allowable current value is obtained directly from the power supply circuit 20 from the viewpoint of safety and avoiding complications. It is not preferable to do.

  On the other hand, in the power supply device 10 of the present embodiment, the allowable current value is not directly acquired from the power supply circuit 20, and the first resistor 31 of the low-voltage interlock circuit 30 that is electrically independent from the power supply circuit 20 is used. The allowable current value is obtained from the resistance value. Thereby, it is not necessary to add a configuration for acquiring the allowable current value to the power supply circuit 20, and since it is independent of the high-voltage power supply circuit 20, the allowable current value can be acquired more safely. .

  Further, the power supply device 10 according to the present embodiment also uses the interlock circuit 30 for monitoring insertion / extraction of the service plug device 40 as a circuit for obtaining the allowable current value of the conduction portion 41 of the service plug device 40. doing. Thereby, it is not necessary to provide a dedicated circuit for acquiring the allowable current value, and the apparatus configuration can be simplified.

  In addition, the power supply device 10 according to the present embodiment has a second resistor 32 that forms part of the interlock circuit 30 and a resistor of the first resistor 31 as means for acquiring the resistance value of the first resistor 31. The detection unit 51 includes a map of values and allowable current values corresponding to the resistance values. Thereby, the resistance value of the 1st resistance 31 provided in the service plug apparatus 40 physically attached or detached can be easily obtained in the control apparatus 50 (detection part 51) side.

<Other embodiments>
As mentioned above, although one embodiment of the present invention has been described, of course, the present invention is not limited to the above-described embodiment, and addition, omission, replacement, etc., of a configuration is possible without departing from the spirit of the present invention. And other changes are possible.

  In the first embodiment, the power supply apparatus 10 uses the interlock circuit 30 as the second electric circuit, but is not limited thereto. The second electric circuit may be an electric circuit that is electrically independent of the power supply circuit 20 (first electric circuit).

  In the first embodiment, the power supply device 10 uses the auxiliary battery 33 to supply power to the interlock circuit 30, but is not limited thereto, and any power supply can be used.

  In the first embodiment, the power supply device 10 is provided with the second resistor 32 in the interlock circuit 30. However, the power supply device 10 is not limited to such a mode, and the control device 50 directly controls the first resistor 31. It is good also as a structure which detects resistance value. The first resistor 31 and the second resistor 32 are connected in series, but may be connected in parallel.

  In the first embodiment, the power supply device 10 detects the allowable current value by the detection unit 51 using the second resistor 32 and the map, but such a detection unit 51 is not essential. The power supply device 10 includes at least a power supply circuit 20, an interlock circuit 30, and a service plug device 40. The interlock circuit 30 includes a first resistor 31, and the service plug device 40 includes a conduction unit 41. May be a resistance value corresponding to the allowable current value of the conduction portion 41. According to such a configuration, the allowable current value of the conduction part 41 can be obtained from the resistance value of the first resistor 31. Then, by using the allowable current value, it is possible to perform control for charging the battery 23 below the allowable current value.

DESCRIPTION OF SYMBOLS 10 ... Power supply device, 20 ... Power supply circuit (1st electric circuit), 23 ... Battery, 30 ... Interlock circuit (2nd electric circuit), 31 ... 1st resistance, 32 ... 2nd resistance, 40 ... Service plug device, 41 ... conduction unit, 50 ... control device, 51 ... detection unit, 52 ... charge control unit, 60 ... charger

Claims (5)

A first electric circuit comprising a vehicle battery;
A second electrical circuit electrically independent from the first electrical circuit;
A service plug device capable of interrupting the first electric circuit and the second electric circuit,
The service plug device includes:
A conduction part that constitutes a part of the first electric circuit and is capable of interrupting the first electric circuit;
A first resistor constituting a part of the second electric circuit,
The first resistor has a resistance value corresponding to an allowable current value of the conducting portion. The power supply device according to claim 1,
The power supply device, wherein the second electric circuit is an interlock circuit capable of detecting that the service plug device has cut off the first electric circuit. The power supply device according to claim 1 or 2,
The power supply device, wherein power is supplied from an auxiliary battery to the second electric circuit. In the power supply device according to any one of claims 1 to 3,
A detection unit for detecting the allowable current value;
The detector is
A second resistor forming part of the second electrical circuit;
A map of a resistance value of the first resistor and the allowable current value corresponding to the resistance value;
A power supply device that detects a resistance value of the first resistor from a divided voltage applied to the second resistor, and detects the allowable current value from the detected resistance value of the first resistor and the map. . In the power supply device according to any one of claims 1 to 4,
A power supply apparatus comprising: a charge control unit that does not charge the battery when the allowable current value obtained from the resistance value of the first resistor is different from the preset allowable current value.

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