JP7826019B2 - Inspection device and method for inspecting battery monitoring device - Google Patents

Description

The present invention relates to an apparatus and method for inspecting a battery monitoring device that monitors batteries.

Electric vehicles such as EVs (Electric Vehicles) and HEVs (Hybrid Electric Vehicles) are equipped with a battery module consisting of multiple battery cells, and run by driving a motor using power supplied from this battery module. These vehicles are equipped with a battery monitoring device for monitoring each battery cell and controlling charging and discharging. This battery monitoring device is required to be able to accurately measure the cell voltage when monitoring the voltage of each battery cell (cell voltage). Therefore, it is generally necessary to conduct a cell voltage measurement characteristics test on the battery monitoring device before shipping to confirm the accuracy of the cell voltage measurement by the battery monitoring device.

As mentioned above, battery monitoring devices are required to be able to accurately measure cell voltages. Therefore, when testing cell voltage measurements, it is desirable to use testing equipment that generates a test voltage that accurately simulates the cell voltage. However, when the test voltage generated by the testing equipment is input into the battery monitoring device, a voltage drop occurs depending on the current consumption of the testing equipment and the wiring resistance between the testing equipment and the battery monitoring device. This results in a voltage error between the test voltage set by the testing equipment and the voltage actually input to the battery monitoring device. As a result, it is difficult to confirm whether the battery monitoring device can accurately measure the test voltage.

One known technology for testing battery monitoring devices that solves the above-mentioned problems is disclosed in Patent Document 1. Patent Document 1 describes an inspection device used to test a cell voltage measurement board that measures the voltages of multiple cells that make up a secondary battery and outputs the measured value. The device measures the voltage input to the cell voltage measurement board and performs feedback control to match the input voltage value to a set voltage value. It also describes a feedback means that calculates the voltage value of the voltage output from the power supply, and a group of switches that switch between the connection and disconnection states of each line of the cell voltage measurement board and the power supply. The feedback means generates a voltage control signal corresponding to the voltage value calculated and outputs it to the power supply. This makes it possible to apply an accurate voltage to the cell voltage measurement board.

JP 2013-205406 A

The inspection device disclosed in Patent Document 1 has the problem that when performing characteristic inspections of cell voltage measurements, it is necessary to perform switching control and feedback control of switch groups, which makes the characteristic inspection procedure complicated and requires a long inspection time.

In consideration of the above-mentioned problems, the present invention aims to provide an inspection device and inspection method that can accurately inspect the cell voltage measurement accuracy of a battery monitoring device in a short period of time.

The testing device according to the present invention is a device for testing the voltage measurement characteristics of a battery monitoring device that is connected to each cell of a secondary battery module in which a plurality of cells are connected in series via a plurality of detection lines and measures the inter-terminal voltage of each cell of the secondary battery module based on the voltage between the detection lines, and includes a plurality of power supplies connected in series to each other, each having a positive electrode and a negative electrode connected to the battery monitoring device via the detection lines and each outputting a DC voltage to the battery monitoring device via the detection lines , a current measuring unit that measures the current flowing through each of the plurality of detection lines, and a plurality of power supplies that measure the voltage between the positive electrode and the negative electrode of each of the plurality of power supplies, thereby testing the voltage measurement characteristics of the battery monitoring device based on the voltage between the positive electrode and the negative electrode of each of the plurality of power supplies. The battery monitoring device includes a voltage measurement unit that measures the output voltage of each of the power sources ; an input voltage calculation unit that calculates the value of the input voltage input to the battery monitoring device via the detection line from each of the plurality of power sources based on the measured value of the output voltage measured by the voltage measurement unit, the measured value of the current measured by the current measurement unit, and the resistance value of the detection line; and an inspection and determination unit that compares the calculated value of the input voltage calculated by the input voltage calculation unit with the measured value of the input voltage measured by the battery monitoring device via the detection line, and inspects the voltage measurement characteristics of the battery monitoring device based on the comparison result between the calculated value of the input voltage and the measured value.
A method for inspecting a battery monitoring device according to the present invention is a method for inspecting the voltage measurement characteristics of a battery monitoring device that is connected to each cell of a secondary battery module in which a plurality of cells are connected in series via a plurality of detection lines and that measures the inter-terminal voltage of each cell of the secondary battery module based on the voltage between the detection lines, wherein a plurality of power sources connected in series to each other, each having a positive electrode and a negative electrode connected to the battery monitoring device via the detection lines , output a DC voltage to the battery monitoring device via the detection lines, measure the current flowing through each of the plurality of detection lines, and measure the voltage between the positive electrode and the negative electrode of each of the plurality of power sources, thereby measuring the output voltage of each of the plurality of power sources, calculate the value of the input voltage input to the battery monitoring device via the detection lines from each of the plurality of power sources based on the measured output voltage and current values and the resistance value of the detection lines, compare the calculated value of the input voltage with the measured value of the input voltage measured by the battery monitoring device via the detection lines, and inspect the voltage measurement characteristics of the battery monitoring device based on the comparison result between the calculated value of the input voltage and the measured value.

The present invention provides an inspection device and inspection method that can accurately inspect the cell voltage measurement accuracy of a battery monitoring device in a short period of time.

FIG. 1 is a diagram showing the configuration of an inspection device according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of a voltage drop in a battery monitoring device according to an embodiment of the present invention. FIG. 3 is an example of a flowchart showing a method for testing a battery monitoring device according to an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. The following description and drawings are examples for explaining the present invention, and some details have been omitted or simplified as appropriate for clarity of explanation. The present invention can also be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

Figure 1 shows the configuration of an inspection device according to one embodiment of the present invention. The inspection device 1 shown in Figure 1 is a device that inspects the voltage measurement characteristics of a battery monitoring device 3, and includes a tester 10, a control device 20, and a communication device 30.

The battery monitoring device 3 monitors and controls the charging and discharging of each secondary battery cell (hereinafter referred to as "cell") that makes up a battery module installed in an electric vehicle such as an EV or HEV, and is installed and used in the electric vehicle together with the battery module. The battery monitoring device 3 is composed of, for example, a power supply IC, a microcomputer, a communication interface circuit, and a cell voltage monitoring IC. When installed in an electric vehicle, the battery monitoring device 3 is connected to each cell of the battery module via detection lines 2 and measures the voltage between the detection lines 2 connected to the positive and negative electrodes of each cell. This allows the battery monitoring device 3 to measure the terminal voltage of each cell and determine the state of charge of each cell based on the measurement results, thereby monitoring each cell and controlling the charging and discharging of each cell.

Before the battery monitoring device 3 is installed in an electric vehicle, the manufacturer of the battery monitoring device 3 uses the inspection device 1 to inspect the voltage measurement characteristics of the battery monitoring device 3 and check whether the battery monitoring device 3 has the specified voltage measurement accuracy. If a battery monitoring device 3 is found that does not have the specified voltage measurement accuracy, the battery monitoring device 3 is deemed defective and is excluded from being installed in an electric vehicle. This ensures that electric vehicles equipped with battery monitoring devices 3 can achieve the desired performance.

The detection wires 2 are used to connect the battery monitoring device 3 to each cell of the battery module when the device is installed in an electric vehicle, and are composed of, for example, a harness, connector, connection pins, etc. When inspecting the battery monitoring device 3 using the inspection device 1, the battery monitoring device 3 is connected to the tester 10 using the same detection wires 2 that are used when the device is installed in an electric vehicle. The tester 10 outputs a test voltage that simulates a battery module to the battery monitoring device 3, and operates under the control of the control device 20. This allows the device to simulate the actual installation state in an electric vehicle, enabling accurate inspection of the voltage measurement characteristics of the battery monitoring device 3.

The testing machine 10 includes a measurement control unit 11, a power supply 12, a voltmeter 13, and an ammeter 14.

The power supply 12 is constructed using a DC power supply such as a stabilized power supply, and outputs a DC voltage to the battery monitoring device 3 via the detection line 2. The testing machine 10 has multiple power supplies 12 connected in series, with the positive and negative poles of each power supply 12 connected to the battery monitoring device 3 via the detection line 2. The voltage value of the DC voltage output from each power supply 12 is controlled according to the set voltage value V1 instructed by the measurement control unit 11, and is adjusted to match the DC voltage output from each cell of the battery module to which the battery monitoring device 3 is connected when installed in an electric vehicle. This makes it possible to simulate the condition when installed in an electric vehicle and inspect the voltage measurement characteristics of the battery monitoring device 3.

The testing machine 10 is provided with multiple voltmeters 13 and ammeters 14, each corresponding to one of the multiple power sources 12. The voltmeters 13 are connected between the positive and negative poles of each power source 12 and measure the DC voltage output from each power source 12. Each voltmeter 13 is preferably located close to its corresponding power source 12 so that the DC voltage of the corresponding power source 12 can be measured with high accuracy. An ammeter 14 is located between each power source 12 and the detection line 2 and measures the current output from each power source 12 and flowing through the detection line 2. The measurement range of each ammeter 14 is preferably changeable according to the test content under the control of the measurement control unit 11. The output voltage measurement value V2 measured by each voltmeter 13 and the current measurement value I measured by each ammeter 14 are output to the measurement control unit 11.

The measurement control unit 11 is configured using a circuit board on which a CPU (Central Processing Unit) and other components are mounted, and performs overall control of the testing machine 10. Specifically, in response to instructions from the control device 20, the measurement control unit 11 sets the output voltage of each power supply 12 according to the set voltage value V1, and acquires output voltage measurement values V2 and current measurement values I from each voltmeter 13 and each ammeter 14, and outputs them to the control device 20.

The control device 20 controls the testing machine 10 and the communication device 30, and is configured as a computer having hardware such as a CPU, ROM (Read Only Memory), RAM (Random Access Memory), and storage. A commercially available PC (Personal Computer) can be used as the control device 20. The control device 20 includes a memory unit 21, a testing machine control unit 22, a communication control unit 23, an input voltage calculation unit 24, and an inspection and determination unit 25.

The memory unit 21 is configured using, for example, a storage device, and stores various information necessary for the operation of the control device 20. The memory unit 21 stores, for example, the aforementioned set voltage value V1 that the test machine control unit 22 instructs the test machine 10, as well as the output voltage measurement value V2 and current measurement value I that the test machine control unit 22 acquires from the test machine 10.

The tester control unit 22, communication control unit 23, input voltage calculation unit 24, and inspection and determination unit 25 are implemented in the control unit 20, for example, by the CPU of the control unit 20 executing a predetermined program. Note that some or all of these may also be implemented using hardware such as a combination of logic circuits or an FPGA (Field Programmable Gate Array).

The tester control unit 22 controls the tester 10 by outputting control signals to the measurement control unit 11 of the tester 10. It also acquires the output voltage measurement value V2 of each voltmeter 13 and the current measurement value I of each ammeter 14 output from the measurement control unit 11 of the tester 10, and stores these in the memory unit 21.

The communication control unit 23 controls the battery monitoring device 3 via the communication device 30 and instructs the battery monitoring device 3 to measure the input voltage. In response to this measurement instruction, the battery monitoring device 3 measures the input voltage input from each power supply 12 of the tester 10 via the detection line 2 and obtains the measured value V4. The obtained input voltage measured value V4 is then output to the communication control unit 23 via the communication device 30. When the input voltage measured value V4 by the battery monitoring device 3 is input from the communication device 30, the communication control unit 23 stores the information in the memory unit 21.

The input voltage calculation unit 24 calculates the value of the input voltage input to the battery monitoring device 3 from each power supply 12 of the tester 10 via the detection line 2 based on the output voltage measurement value V2 and current measurement value I stored in the memory unit 21, and outputs the calculation result to the inspection and judgment unit 25 as the input voltage calculation value V3. At this time, the input voltage calculation unit 24 calculates the input voltage of the battery monitoring device 3 taking into account the resistance value of the detection line 2. The specific method for calculating the input voltage by the input voltage calculation unit 24 will be described later.

The inspection and determination unit 25 compares the input voltage measurement value V4 by the battery monitoring device 3, acquired by the communication control unit 23 and stored in the memory unit 21, with the input voltage calculation value V3 calculated by the input voltage calculation unit 24, and inspects the voltage measurement characteristics of the battery monitoring device 3 based on the comparison result. Here, for example, it determines whether the voltage measurement accuracy of the battery monitoring device 3 is within a specified range, and if it is, it is determined to be a normal product, and if it is not, it is determined to be a defective product. The inspection results by the inspection and determination unit 25 are presented to the inspector operating the inspection device 1, for example, using a display device (not shown).

The communication device 30 communicates between the control device 20 and the battery monitoring device 3. For example, when an input voltage measurement instruction signal for the battery monitoring device 3 is input from the communication control unit 23 of the control device 20, the communication device 30 outputs the measurement instruction signal to the battery monitoring device 3, causing the battery monitoring device 3 to measure the input voltage. Furthermore, when the input voltage measurement value V4 is input from the battery monitoring device 3, it is transferred to the communication control unit 23.

Next, a method for inspecting a battery monitoring device 3 using the inspection device 1 will be described with reference to the flowchart in Figure 3. Figure 3 is an example of a flowchart showing a method for inspecting a battery monitoring device according to one embodiment of the present invention. Here, the battery monitoring device 3 is connected to the testing machine 10 using the detection line 2, as shown in Figure 1, and is also connected to the communication device 30.

First, the inspection device 1 sets the output voltage value V1 for the power supply 12 (step S1). Here, for example, the tester control unit 22 of the control device 20 reads the set voltage value V1 stored in advance in the memory unit 21 and outputs it to the tester 10. In the tester 10, the set voltage value V1 output from the tester control unit 22 is input to the measurement control unit 11, which controls the power supply 12 so that it outputs a DC voltage corresponding to the set voltage value V1. By performing this operation in the same way for each of the multiple power supplies 12 arranged in the tester 10, the output voltage of each series-connected power supply 12 is adjusted to match the set voltage value V1. Note that the set voltage value V1 may be different for each power supply 12, or the same set voltage value V1 may be used for all power supplies 12.

Next, the inspection device 1 measures the current value I using the ammeter 14 (step S2). At this time, the control device 20 issues a power-on instruction to the battery monitoring device 3 via the communication device 30 from the communication control unit 23, placing the battery monitoring device 3 in a power-on state and enabling input voltage measurement, allowing current to flow from each power source 12 to the battery monitoring device 3 via the detection line 2. The tester 10 then measures the current flowing from each power source 12 to the detection line 2 using multiple ammeters 14 arranged corresponding to the multiple series-connected power sources 12. The current measurement results from each ammeter 14 are output from the tester 10 to the control device 20 by the measurement control unit 11, and then input to the tester control unit 22 in the control device 20. The tester control unit 22 stores the input measurement results from each ammeter 14 as the current measurement value I in the memory unit 21. At this time, it is preferable to distinguish which power source 12 each current measurement value I corresponds to, for example, by numbering the current measurement value I for each ammeter 14.

Next, the inspection device 1 measures the output voltage value V2 of each power supply 12 using the voltmeter 13 (step S3). At this time, the tester 10 measures the DC voltage output from each power supply 12 by measuring the voltage between the positive and negative poles of each power supply 12 using multiple voltmeters 13 arranged corresponding to the multiple power supplies 12 connected in series. The output voltage measurement results from each voltmeter 13 are output from the tester 10 to the control device 20 by the measurement control unit 11, and then input to the tester control unit 22 in the control device 20. The tester control unit 22 stores the input measurement results from each voltmeter 13 in the memory unit 21 as output voltage measurement values V2. At this time, as in step S2, it is preferable to distinguish which power supply 12 each of the multiple output voltage measurement values V2 stored in the memory unit 21 corresponds to, for example, by numbering and storing each output voltage measurement value V2.

Next, the inspection device 1 acquires the voltage measurement value V4 from the battery monitoring device 3 (step S4). Here, the communication control unit 23 issues an instruction to the battery monitoring device 3 via the communication device 30 to measure the input voltage, and the input voltage measurement result measured by the battery monitoring device 3 in response to this measurement instruction is acquired by the communication device 30 and transmitted to the control device 20. In the control device 20, the input voltage measurement result of the battery monitoring device 3 transmitted from the communication device 30 is received by the communication control unit 23 and stored in the memory unit 21 as the input voltage measurement value V4. At this time, as in steps S2 and S3, it is preferable to distinguish which power source 12 each of the multiple input voltage measurement values V4 stored in the memory unit 21 corresponds to, for example, by numbering and storing each input voltage measurement value V4.

Next, the inspection device 1 calculates the input voltage V3 to the battery monitoring device 3 (step S5). Here, the inspection device 1 calculates the input voltage calculated value V3 as the value obtained by subtracting the voltage drop due to the detection line 2 from the output voltage measured value V2 based on the current measurement value I and output voltage measurement value V2 measured in steps S2 and S3, respectively, and the resistance value R of the detection line 2. The resistance value R of the detection line 2 is pre-stored in the memory unit 21. It is preferable that the memory unit 21 also stores the resistance value R of the detection line 2 connecting the power source 12 and the battery monitoring device 3 for each of the multiple power sources 12 provided in the testing machine 10.

The method for calculating the input voltage calculation value V3 in step S5 is described in detail below with reference to Figure 2. Figure 2 is an explanatory diagram of voltage drop in a battery monitoring device according to one embodiment of the present invention.

The power supply 12 and the input terminal of the battery monitoring device 3 are connected via a detection line 2 composed of a combination of a harness, a connector, a connection pin, etc. As shown in Figure 2, the resistance value R of this connection path is determined by the harness line resistance r1 and the connection contact resistance r1' of the detection line 2 connected to the positive electrode side of the power supply 12, and the harness line resistance r2 and the connection contact resistance r2' of the detection line 2 connected to the negative electrode side of the power supply 12. If the current value flowing through this connection path is i, the output voltage of the power supply 12 is Vo, and the input voltage on the battery monitoring device 3 side is Vin, the voltage drop value in the detection line 2 can be expressed by the following equation (1):
Vo-Vin=R×i...(1)

Vo, Vin, and i in equation (1) correspond to the measured output voltage value V2, calculated input voltage value V3, and measured current value I, respectively. Therefore, equation (1) shows that the difference between the measured output voltage value V2 and calculated input voltage value V3 can be calculated by calculating the voltage drop in detection line 2 from the measured current value I and the resistance value R of detection line 2.

Specifically, in step S5, the resistance value R of the detection line 2, which has been stored in advance in the storage unit 21, and the current measurement value I and output voltage measurement value V2, which have been stored in the storage unit 21 in steps S2 and S3, respectively, are read from the storage unit 21, and these values are input to the input voltage calculation unit 24. The input voltage calculation unit 24 calculates the input voltage calculation value V3 of the battery monitoring device 3 based on the input resistance value R, current measurement value I, and output voltage measurement value V2 using the following equation (2).
V3=V2-R×I...(2)

The input voltage calculation value V3 of the battery monitoring device 3 calculated in step S5 is output from the input voltage calculation unit 24 to the inspection and determination unit 25. The input voltage calculation value V3 may also be stored in the memory unit 21.

Next, the inspection device 1 uses the inspection and determination unit 25 to compare the calculated input voltage value V3 calculated in step S5 with the measured input voltage value V4 stored in the memory unit 21 in step S4 (step S6). Here, the comparison is made by, for example, calculating the difference between the calculated input voltage value V3 and the measured input voltage value V4.

Finally, the inspection device 1 uses the inspection and judgment unit 25 to inspect and judge the battery monitoring device 3 based on the comparison result of step S6 (step S7). Here, for example, the difference between the input voltage calculation value V3 and the input voltage measurement value V4 calculated in step S6 is compared with a predetermined inspection threshold pre-stored in the memory unit 21, and if the difference is within the inspection threshold, it is judged that the battery monitoring device 3 is normal. On the other hand, if the difference is greater than the inspection threshold, it is judged that the battery monitoring device 3 is abnormal. This allows the voltage measurement characteristics of the battery monitoring device 3 to be inspected.

After the inspection and determination are made in step S7, the inspection device 1 presents the results to the inspector and terminates the processing shown in the flowchart of Figure 3. Note that if multiple set voltage values V1 are set, the set voltage value V1 may be changed to another value, and the same processing may be performed again from step S1 to inspect the voltage measurement characteristics of the battery monitoring device 3 for multiple set voltage values V1.

Furthermore, the voltage measurement characteristic test described above may be performed in combination with other characteristic test items of the battery monitoring device 3. In that case, after the test of the other characteristic test items is completed, the process shown in the flowchart in Figure 3 can be restarted from step S1.

Furthermore, if the battery monitoring device 3 has the function of calculating the resistance value R of the detection line 2, the resistance value R of the detection line 2 may be obtained from the battery monitoring device 3 and used when calculating the input voltage calculation value V3 of the battery monitoring device 3 in step S5. In this case, the resistance value R of the detection line 2 may be obtained in advance from the battery monitoring device 3 and stored in the memory unit 21, or it may be obtained from the battery monitoring device 3 via the communication device 30 when calculating the input voltage calculation value V3 in step S5.

As described above, the inspection device 1 of this embodiment calculates the input voltage to the battery monitoring device 3 based on the measured values of the output voltage and current of the power supply 12 and the connection path resistance of the detection line 2 between the power supply 12 and the battery monitoring device 3. As a result, the input voltage of the battery monitoring device 3 can be calculated with high precision, allowing for accurate inspection. Furthermore, since this embodiment does not require feedback means or switches like those in the inspection device disclosed in Patent Document 1, the inspection procedure can be simplified and the inspection time can be shortened.

The inspection device 1 of this embodiment and the inspection method for the battery monitoring device 3 using it described above provide the following advantages.

(1) The inspection device 1 is a device for inspecting the voltage measurement characteristics of a battery monitoring device 3 that is connected via multiple detection lines 2 to each cell of a secondary battery module in which multiple cells are connected in series, and that measures the inter-terminal voltage of each cell of the secondary battery module based on the voltage between the detection lines 2. The inspection device 1 includes a power source 12 that outputs a DC voltage to the battery monitoring device 3 via the detection lines 2, an ammeter 14 that measures the current flowing through the detection lines 2, a voltmeter 13 that measures the output voltage of the power source 12, an input voltage calculation unit 24, and an inspection and determination unit 25. The input voltage calculation unit 24 calculates the input voltage value V3 input to the battery monitoring device 3 from the power source 12 via the detection lines 2 based on the output voltage measurement value V2 measured by the voltmeter 13, the current measurement value I measured by the ammeter 14, and the resistance value R of the detection lines 2 (step S5). The inspection and determination unit 25 compares the input voltage calculation value V3 calculated by the input voltage calculation unit 24 with the input voltage measurement value V4 measured by the battery monitoring device 3 via the detection line 2 (step S6), and inspects the voltage measurement characteristics of the battery monitoring device 3 based on these comparison results (step S7). In this way, the accuracy of cell voltage measurements by the battery monitoring device 3 can be inspected accurately in a short period of time.

(2) The inspection device 1 is equipped with a communication device 30 that communicates with the battery monitoring device 3. The inspection and determination unit 25 acquires the input voltage measurement value V4 from the battery monitoring device 3 via the communication device 30 (step S4). In this way, the input voltage measurement value V4 acquired by the battery monitoring device 3 can be easily acquired by the inspection device 1.

(3) The inspection device 1 has a plurality of power sources 12 in the testing machine 10. The plurality of power sources 12 are connected in series, and the positive and negative poles of each of the plurality of power sources 12 connected in series are connected to the battery monitoring device 3 via the detection wires 2. This configuration allows for accurate inspection of the voltage measurement characteristics of the battery monitoring device 3 by simulating the actual installation state in an electric vehicle.

(4) The voltmeter 13 measures the voltage between the positive and negative poles of each of the multiple power sources 12, thereby measuring the output voltage of the power sources 12. In this way, the output voltage of the power sources 12 can be accurately measured.

(5) In the method for inspecting the battery monitoring device 3 using the inspection device 1, a DC voltage is output from the power source 12 to the battery monitoring device 3 via the detection line 2 (step S1), and the current I flowing through the detection line 2 and the output voltage V2 of the power source 12 are measured (steps S2 and S3). Based on these measured values V2 and I and the resistance value R of the detection line 2, the value V3 of the input voltage input from the power source 12 to the battery monitoring device 3 via the detection line 2 is calculated (step S5). The calculated input voltage value V3 is then compared with the measured value V4 of the input voltage measured by the battery monitoring device 3 via the detection line 2 (step S6), and the voltage measurement characteristics of the battery monitoring device 3 are inspected based on the comparison result (step S7). This method realizes an inspection method that can accurately inspect the cell voltage measurement accuracy of the battery monitoring device 3 in a short time.

In the embodiment described above, the output voltage measurement value V2 measured by the voltmeter 13 is used to calculate the input voltage calculation value V3 in step S5 of Fig. 3. However, instead of this, the set value V1 of the output voltage of the power supply 12 set by the tester control unit 22 may be used. In this case, the input voltage calculation unit 24 can calculate the input voltage calculation value V3 of the battery monitoring device 3 using the following equation (3) based on the resistance value R, the measured current I, and the set voltage value V1.
V3=V1-R×I...(3)

When calculating the calculated input voltage value V3 of the battery monitoring device 3 using the above formula (3), there is no need to include a voltmeter 13 in the testing machine 10, thereby reducing the cost of the testing device 1. Furthermore, the process of step S3, which measures the measured output voltage V2, can be omitted, which also shortens the testing time. However, in this case, the output voltage of the power supply 12 must be accurately adjusted to match the set value V1, which requires a high-precision voltage adjustment function for the power supply 12 and may require a long time to adjust the power supply 12 during testing. In practice, these conditions should be taken into consideration when deciding whether to use the measured output voltage value V2 or the set voltage value V1 to calculate the calculated input voltage value V3 of the battery monitoring device 3.

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

1: Inspection device 2: Detection line 3: Battery monitoring device 10: Tester 11: Measurement control section 12: Power supply 13: Voltmeter 14: Ammeter 20: Control device 21: Memory section 22: Tester control section 23: Communication control section 24: Input voltage calculation section 25: Inspection and judgment section 30: Communication device

Claims (4)

1. An apparatus for inspecting voltage measurement characteristics of a battery monitoring device that is connected to each cell of a secondary battery module having a plurality of cells connected in series via a plurality of detection lines and measures a voltage between terminals of each cell of the secondary battery module based on a voltage between the detection lines,
a plurality of power supplies connected in series to each other, each having a positive electrode and a negative electrode connected to the battery monitoring device via the detection line, and each outputting a DC voltage to the battery monitoring device via the detection line;
a current measuring unit that measures a current flowing through each of the plurality of detection lines;
a voltage measurement unit that measures an output voltage of each of the plurality of power sources by measuring a voltage between the positive electrode and the negative electrode of each of the plurality of power sources ;
an input voltage calculation unit that calculates a value of an input voltage input to the battery monitoring device from each of the plurality of power sources via the detection line based on the measurement value of the output voltage measured by the voltage measurement unit, the measurement value of the current measured by the current measurement unit, and the resistance value of the detection line;
an inspection determination unit that compares the calculated value of the input voltage calculated by the input voltage calculation unit with the measured value of the input voltage measured by the battery monitoring device via the detection line, and inspects the voltage measurement characteristics of the battery monitoring device based on the comparison result between the calculated value of the input voltage and the measured value. 2. The inspection device according to claim 1,
a communication device for communicating with the battery monitoring device,
The inspection and determination unit is an inspection device that acquires a measurement value of the input voltage from the battery monitoring device via the communication device. 2. The inspection device according to claim 1,
a testing machine control unit that sets the value of the DC voltage output by the power supply,
The input voltage calculation unit calculates the value of the input voltage using the DC voltage set value by the testing machine control unit, instead of the measured value of the output voltage measured by the voltage measurement unit. A method for inspecting voltage measurement characteristics of a battery monitoring device that is connected to each cell of a secondary battery module having a plurality of cells connected in series via a plurality of detection lines and measures a voltage between terminals of each cell of the secondary battery module based on a voltage between the detection lines, comprising:
a plurality of power supplies connected in series to each other, each having a positive electrode and a negative electrode connected to the battery monitoring device via the detection lines , outputting a DC voltage to the battery monitoring device via the detection lines;
measuring a current flowing through each of the plurality of detection lines;
measuring an output voltage of each of the plurality of power sources by measuring a voltage between the positive electrode and the negative electrode of each of the plurality of power sources ;
calculating a value of an input voltage input to the battery monitoring device from each of the plurality of power sources via the detection line based on the measured values of the output voltage and the current and the resistance value of the detection line;
comparing the calculated value of the input voltage with the measured value of the input voltage measured by the battery monitoring device via the detection line;
A method for inspecting a battery monitoring device, the method inspecting the voltage measurement characteristics of the battery monitoring device based on a comparison result between the calculated value of the input voltage and the measured value.