JP2000294297A - Battery charger/discharger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold reliability in charge/discharge operation by stopping the charge/ discharge operation by a charge/discharge practicing part when abnormality of the charge/discharge operation is caused by abnormality of a battery, and stopping the charge/ discharge operation by cutting off a relay arranged in an electric current passage of a charging/discharging current when the abnormality is caused by the charge/discharge practicing part. SOLUTION: In the case an apparatus in a device is abnormal, when abnormality of one's own function is detected by an electric current and voltage abnormality detecting means and a disconnection detecting means inside of respective apparatuses in a charge/discharge part 13, a measuring part 15 or a charge/discharge control part 16, a contact point signal is transmitted to a control management part 17 from the respective apparatuses. The control management part 17 receiving the contact point signal opens an isolating switch 14 to cut off an electric current supply line to finish charge/discharge operation. In the case where a battery is abnormal, when detecting it, an electric current input/output stopping sequence for stopping input/output of a charging/discharging current and a supply line cutoff sequence for forcedly cutting off a supply line of the charging/discharging current are parallelly performed to stop the charging/discharging current.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery charging / discharging device.

[0002]

2. Description of the Related Art EV (Electric Vehicle)
e) and HV (Hybrid Electric Vehi)
In cle), a battery for supplying power to the drive motor is provided. In this battery, the current handled at the time of charging and discharging is considerably large. Therefore, a battery charging / discharging device for charging / discharging a battery, measuring power, and the like has a specification capable of handling a current exceeding 100 amperes. In a battery charge / discharge device that handles such a large current, when an abnormality occurs during charge / discharge, the battery or the battery charge / discharge device may be adversely affected. For this reason, when an abnormality is detected in the battery charge / discharge device, a large current is reliably stopped by forcibly shutting off a relay provided in a current path of the charge / discharge current.

[0003]

In a conventional battery charging / discharging device, when an abnormality is detected, a large current is stopped by forcibly shutting off a current path relay. That is, since the interruption is always performed when the current path is energized, by repeating this operation, the contacts of the current path relay are worn, the life is shortened, and the reliability of the battery charging / discharging device for charging / discharging is impaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a charge / discharge operation is performed by stopping a large current while protecting a contact point of a current path relay of a charge / discharge current of a battery charge / discharge device. It is an object of the present invention to provide a battery charge / discharge device capable of maintaining reliability in operation.

[0005]

A battery charging / discharging device according to the present invention performs a charging / discharging operation on a target battery by a charging / discharging execution unit, and detects an abnormality of the charging / discharging execution unit and the battery during the charging / discharging operation. In the battery charge / discharge device capable of detecting, when an abnormality is detected in the charge / discharge operation, if the abnormality is caused by an abnormality in the battery, the charge / discharge operation by the charge / discharge execution unit is stopped, and the abnormality is detected in the charge / discharge operation. In the case where the charging / discharging operation is caused, the charging / discharging operation is stopped by shutting off a relay provided in a current path of the charging / discharging current.

When an abnormality is detected in the charging / discharging operation, and when the abnormality is caused by an abnormality in the battery, a relay provided in a current path of the charging / discharging current is shut off after a predetermined time, thereby making the battery switchable. The charging / discharging operation is stopped.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an example of a configuration diagram of a battery charging / discharging device according to the present invention. Hereinafter, each device included in the battery charge / discharge device will be described.

The test battery 11 is a battery to be charged / discharged in the battery charging / discharging device, and is disposed in a constant temperature bath 12 for keeping the internal temperature constant. The test battery 11 is, for example, a nickel-metal hydride battery or various secondary batteries.
The test battery 11 has a line for supplying a charge / discharge current (hereinafter, referred to as a line).
(Referred to as a current supply line). A thermometer is connected to the test battery 11, and a measurement signal including information on the temperature of the test battery 11 is supplied to the measuring unit 15.

The charge / discharge unit 13 is a device for inputting / outputting a charge / discharge current to / from the test battery 11 through a current supply line for charging / discharging. The charge / discharge unit 13 controls a charge / discharge current based on a control signal transmitted from the charge / discharge control unit 16. A cutoff switch 14 is provided on the current supply line, and the current supply line can be forcibly cut off by opening the cutoff switch 14. The cutoff switch 14 forms a cutoff relay that controls cutoff of the current supply line together with the control management unit 17. An ammeter and a voltmeter are connected to the charging / discharging unit 13.
The measurement signal including the information of the current value and the voltage value of the
5 is supplied. Note that, in FIG.
Although shown as two signals, it is desirable to configure each measurement value as a separate signal line.

The measuring unit 15 calculates the battery capacity of the test battery 11 based on the measurement signals supplied from the test battery 11 and the charging / discharging unit 13 and determines whether the test battery 11 is abnormal. It is. The measuring unit 15 determines whether there is an abnormality,
Based on a measurement signal supplied as analog data, a first step of determining an abnormality by a hardware circuit including a comparator, for example, and a measurement value that is digital data is obtained from the measurement signal amplified by the hardware circuit. And a second stage in which an abnormality is determined by performing a calculation using software based on the above. When the hardware circuit determines that the measurement circuit 15 is abnormal, the measurement unit 15 transmits a contact signal to the control management unit 17 to cause the control management unit 17 to open the cutoff switch 14. Further, the measuring unit 15 may determine whether the charging / discharging unit 13
Is transmitted to the charge / discharge control unit 16. Here, if the test battery 11 or the charge / discharge unit 13 has a function of outputting digital data as a measurement signal,
The measurement unit 15 may directly take in this data and execute only the abnormality determination by software.

The charge / discharge control unit 16 is a device for controlling a charge / discharge operation. The charge / discharge control unit 16 is configured based on a control signal transmitted from the measurement unit 15 or the control management unit 17,
A control signal including a control command for the charge / discharge unit 13 is transmitted to the charge / discharge unit 13. That is, the charge / discharge control unit 16 controls the charge / discharge current of the charge / discharge unit 13 based on the charge / discharge instruction transmitted from the control management unit 17,
Feedback control based on the measurement value of No. 5 is also performed. The charge / discharge unit 13, the measurement unit 15, and the charge / discharge control unit 16 correspond to the charge / discharge execution unit of the present invention.

Here, the charging / discharging unit 13, the measuring unit 15, and the charging / discharging control unit 16 have means for detecting current and voltage abnormalities and disconnection detecting means inside each device. An abnormality is detected, and when an abnormality is detected, a contact signal for causing the control management unit 17 to open the cutoff switch 14 is instantaneously transmitted to the control management unit 17. Further, a means for detecting an abnormality of the function of the charge / discharge unit 13, the measuring unit 15, and the charge / discharge control unit 16 is provided. When an abnormality of any of the devices is detected, a contact signal is transmitted to the control management unit 17 from this means. You may.

The control management unit 17 is a device that controls the cutoff of the supply line of the charging / discharging current based on the charging / discharging control command and the state of each device in the battery charging / discharging device. The former sends a control signal related to charge / discharge control to the charge / discharge control unit 16, and the latter opens the cutoff switch 14 when receiving contact signals from the charge / discharge unit 13, the measurement unit 15, and the charge / discharge control unit 16. This is realized by interrupting the current supply line. The control management unit 17 and the cutoff switch 14 constitute a cutoff relay that controls cutoff of the current supply line.

The outline of the charging / discharging operation of the battery charging / discharging device according to the first embodiment will be described below with reference to FIG.

The measurer confirms that the test battery 11 is housed in the thermostat 12 and is in a state that can be measured by the measuring unit 15, and the control management unit 17 instructs the charge / discharge control unit 16 to start charging or discharging. Is transmitted. When the charge / discharge control unit 16 receives this control signal, the charge / discharge control unit 16
Transmits a control signal of a charge or discharge start command to the charge / discharge unit 13, and the charge / discharge unit 13 receiving the control signal
To start charging or discharging. The charge / discharge unit 13
Transmits information on the input / output current to the measurement unit 15 as a measurement signal. The measurer also transmits a control signal indicating the end of charging or discharging from the control management unit 17 to the charging / discharging control unit 16 even when ending the charging or discharging. A control signal of a charge or discharge termination command is transmitted from the control unit 16 to the charge / discharge unit 13, and charging / discharging can be terminated by stopping input / output of the charging / discharging current.

The control management section 17 controls the charge / discharge current handled by the charge / discharge section 13 and the charge / discharge control method (constant current,
(Constant voltage, constant power) may be set, and the charge / discharge unit 13 may be controlled via the charge / discharge control unit 16.

Abnormalities in the charging / discharging operation of the battery charging / discharging device are caused by the battery, such as abnormalities in current, voltage, and temperature, and by devices in the battery charging / discharging device used in the charging / discharging operation. Can be classified as It is necessary to stop the charging / discharging current immediately for abnormalities caused by the equipment used for the charging / discharging operation because it may adversely affect the battery charging / discharging device. Absent. In the battery charging / discharging device of this embodiment, the method of stopping the charging / discharging current differs depending on the type of the detected abnormality.

FIG. 2 shows a work flow when an abnormality occurs when the charge / discharge operation is performed by the battery charge / discharge device according to the embodiment. Hereinafter, the operation of the battery charging / discharging device according to the embodiment when an abnormality occurs in the charging / discharging operation will be described for each type of abnormality with reference to FIGS. 1 and 2.

In the case of an abnormality in a device in the battery charging / discharging device: the charging / discharging unit 13, the measuring unit 15, or the charging / discharging control unit 16 performs its own function by detecting current and voltage abnormalities and disconnection detecting means in each device. When an abnormality is detected (step S1), a contact signal is transmitted from each device to the control management unit 1.
7 is transmitted (step S2). Upon receiving the contact signal, the control management unit 17 opens the cutoff switch 14 (Step S3), cuts off the current supply line (Step S4),
The charging / discharging operation is completed (step S5).

In the case of an abnormality of the battery: When an abnormality caused by the battery is detected, the battery charging / discharging device according to the embodiment performs a current input / output for stopping the input / output of the charging / discharging current as the operation of stopping the charging / discharging current. The stop sequence and the supply line cutoff sequence for forcibly cutting off the supply line of the charge / discharge current are executed in parallel. In FIG. 2, the flow from step S7 to step S5 via step S8 corresponds to the current input / output stop sequence, and the flow from step S7 to step S5 via step S2 corresponds to the supply line cutoff sequence. The outline of the operation of each sequence will be described below.

(Current input / output stop sequence) Sample battery 1
When the temperature information is supplied from 1 and the current value and the voltage value of the test battery 11 are supplied from the charge / discharge unit 13 to the measurement unit 15 as the measurement signal (step S6), the measurement unit 15 supplies the measurement signal supplied as analog data. Is determined by the hardware circuit based on the above (step S7). The measuring unit 15 further determines abnormality of the measured value by software based on the measured value obtained by amplifying the measured signal and converting it to digital data (step S8). Step S
If it is determined in step 8 that there is an abnormality, the measurement unit 15 sends a control signal for stopping the current to the charge / discharge control unit 16 (step S9). Charge / discharge control unit 1 that has received the control signal
6 transmits a control signal of a current stop command to the charge / discharge unit 13 (step S10), and receives the control signal.
Stops input / output of charge / discharge current (step S11),
The charging / discharging operation is completed (step S5). The above is the operation performed in the current input / output stop sequence.

(Supply line cutoff sequence) Sample battery 1
When the temperature information is supplied from 1 and the current value and the voltage value of the test battery 11 are supplied from the charge / discharge unit 13 to the measurement unit 15 as the measurement signal (step S6), the measurement unit 15 supplies the measurement signal supplied as analog data. Is determined based on the hardware circuit (step S7). If it is determined in step S7 that there is an abnormality, the measurement unit 15 sends a contact signal to the control management unit 17 (step S2). After receiving the contact signal, the control management unit 17 opens the cutoff switch 14 after the lapse of a predetermined time (step S12), cuts off the current supply line (step S4), and ends the charge / discharge operation (step S5). The above is the operation performed in the supply line cutoff sequence.

In this sequence, the control management unit 17
It is preferable that the predetermined time from when the contact signal is received to when the cut-off switch 14 is opened be at least as long as the stop of the input / output of the charge / discharge current of the charge / discharge unit 13 is completed.
Further, the control management unit 17 may have a function capable of setting the predetermined time.

In the battery charging / discharging device of such an embodiment, when the charging / discharging unit 13, the measuring unit 15, or the charging / discharging control unit 16 detects an abnormality in its function, the current supply line is forcibly cut off. However, when an abnormality due to the test battery 11 occurs, a current input / output stop sequence for stopping the input / output of the charge / discharge current to the charge / discharge unit 13 via the charge / discharge control unit 16 is performed. It is not necessary to cut off the current supply line when the battery is abnormal, and the wear of the contacts of the cutoff switch 14 can be reduced.

When an abnormality due to the test battery 11 occurs, a current input / output stop sequence for stopping the input / output of charge / discharge current to the charge / discharge unit 13 via the charge / discharge control unit 16 and a predetermined time period After that, the control management unit 17
4 is opened and the supply line cutoff sequence to cut off the charge / discharge current supply line is executed in parallel, so that charging / discharging current input / output can be stopped even if the current input / output stop sequence cannot be stopped due to a failure or the like. The discharge current can be stopped.

[0027]

As described above, according to the battery charging / discharging apparatus according to the present invention, when an abnormality is detected in the charging / discharging operation, and when the abnormality is caused by an abnormality in the battery, the charging / discharging execution unit is operated. When the charging / discharging operation is stopped, and the abnormality is caused by the charging / discharging execution unit, the relay provided on the current path of the charging / discharging current is shut off to stop the charging / discharging operation.
Charging and discharging can be stopped while minimizing wear of the contacts of the relay in the current path, which leads to maintaining the reliability of charging and discharging of the battery charging and discharging device.

When an abnormality is detected in the charging / discharging operation, and when the abnormality is caused by an abnormality in the battery, the charging / discharging operation is stopped by shutting off a relay provided in a current path of the charging / discharging current. By doing so, it is possible to more reliably stop the charging / discharging operation when the battery is abnormal. That is, even if the input / output of the charging / discharging current is not stopped due to an unpredictable failure such as a failure in the control system of the charging / discharging operation or a disconnection of the signal line, the relay of the current path is cut off in parallel. Therefore, occurrence of a disaster due to a large current can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a battery charge / discharge device shown in an embodiment of the present invention.

FIG. 2 shows a workflow when an abnormality occurs according to the embodiment of the present invention.

[Explanation of symbols]

11 Test battery, 12 Constant temperature bath, 13 Charge / discharge unit, 14
Cutoff switch, 15 measuring unit, 16 charge / discharge control unit, 1
7 Control management unit.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5G003 AA01 BA01 CC02 DA07 EA09 FA04 5H030 AA06 AS18 FF51 5H115 PI16 PI29 PU01 QN12 TI05 TI06 TI10 TR19 TZ03

Claims (2)

[Claims] A battery charging / discharging device capable of performing a charging / discharging operation on a target battery by a charging / discharging execution unit and detecting an abnormality of the charging / discharging execution unit and the battery during the charging / discharging operation, wherein an abnormality is detected in the charging / discharging operation. If detected, the charging / discharging operation by the charging / discharging execution unit is stopped when the abnormality is caused by a battery abnormality, and the charging / discharging current is stopped when the abnormality is caused by the charging / discharging execution unit. A battery charging / discharging device, wherein the charging / discharging operation is stopped by shutting off a relay provided in a path. 2. The battery charging / discharging device according to claim 1, wherein when an abnormality is detected in the charging / discharging operation, and when the abnormality is caused by an abnormality in the battery, a current of the charging / discharging current after a predetermined time. A battery charging / discharging device, wherein the charging / discharging operation is stopped by shutting off a relay provided in a path.