Reverse current testing tool for battery management system

Abstract

The utility model relates to a reverse current testing tool for a battery management system, which belongs to the technical field of testing devices for the battery management system and comprises a power supply module, a switch matrix is arranged between the power supply module and the battery management system, and the switch matrix is used for enabling the battery management system to be positively or reversely connected with the power supply module. A circuit protection module is arranged between the switch matrix and the battery management system, the tool further comprises a current detection module used for detecting the current intensity of the power supply module, and the current detection module is further used for cutting off the switch matrix when the current intensity exceeds a preset value. According to the utility model, the power supply module is positively or reversely connected with the BMS through the switch matrix, forward and reverse current tests can be carried out on the BMS, the BMS product is protected through the circuit protection module, the switch matrix is cut off by the current detection module when the current intensity exceeds a preset value, and the test tool can fully test and protect the BMS product.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery management system testing devices, specifically relating to a reverse current testing fixture for a battery management system. Background Technology

[0002] The Battery Management System (BMS) of an electric vehicle is a crucial component of the battery system within the three core electric systems (battery, motor, and electronic control system). It is a key component for monitoring and protecting the battery system. Testing the performance and quality of the BMS is essential for improving the safety, reliability, and economy of the battery pack; therefore, a series of tests for the BMS are crucial.

[0003] Current BMS test fixtures only cover wake-up and sleep tests and power consumption tests for power supply systems, lacking reverse current testing for reverse power connection, thus failing to cover all operating conditions. This presents significant inconvenience during BMS charge / discharge tests, overcharge and over-discharge protection tests, and other operations. Therefore, there is an urgent need to design a test fixture for BMS reverse current testing to effectively detect faults such as abnormalities in the BMS power supply module and power interface protection circuits, ensuring normal product shipment. Utility Model Content

[0004] The purpose of this invention is to provide a reverse current testing fixture for a battery management system in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A reverse current testing fixture for a battery management system (BMS) includes a power supply module and a switch matrix between the power supply module and the BMS. The switch matrix allows the BMS to be connected in either a forward or reverse direction. A circuit protection module is also provided between the switch matrix and the BMS. The fixture further includes a current detection module for detecting the current intensity of the power supply module, and this current detection module is also used to disconnect the switch matrix when the current intensity exceeds a preset value. This testing fixture can perform forward and reverse current tests on the BMS. During forward current testing, the power supply module is connected to the BMS in a forward direction via the switch matrix, and the power supply module provides forward current to the BMS through the switch matrix. During reverse current testing, the power supply module is connected to the BMS in a reverse direction via the switch matrix, and the power supply module provides reverse current to the BMS through the switch matrix. The circuit protection module protects the BMS during both forward and reverse current tests. The current detection module detects the current intensity of the power supply module's output current; when the current intensity exceeds a preset value, it disconnects the switch matrix, creating an open circuit between the BMS and the power supply module, further protecting the BMS.

[0007] As a further optimization of this utility model, the power supply module includes a power supply, a first power supply line disposed at the positive terminal of the power supply, and a second power supply line disposed at the negative terminal of the power supply.

[0008] As a further optimization of this utility model, the switch matrix includes a first switch and a second switch connected in parallel to the positive terminal of the BMS, and a third switch and a fourth switch connected in parallel to the negative terminal of the BMS. The first switch and the second switch correspond to the first power supply line and the second power supply line, respectively, and the third switch and the fourth switch correspond to the second power supply line and the first power supply line, respectively.

[0009] As a further optimization of this utility model, the first power supply line includes a first main line connected to the positive terminal of the power supply, and a first branch and a second branch connected to the first main line, and the first branch and the second branch correspond to the first switch and the fourth switch, respectively. The second power supply line includes a second main line connected to the negative terminal of the power supply, and a third branch and a fourth branch connected to the second main line, and the third branch and the fourth branch correspond to the third switch and the second switch, respectively.

[0010] As a further optimization of this utility model, the current detection module is set on the first main circuit or the second main circuit, and the current detection module includes a current meter and a controller electrically connected to the current meter.

[0011] As a further optimization of this utility model, the circuit protection module is a TVS diode, and the two ends of the TVS diode are respectively connected to the positive terminal of the BMS and the negative terminal of the BMS.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1) This utility model uses the test fixture to perform forward and reverse current tests on the BMS. During the forward current test, the power supply module is connected to the BMS in the correct direction through the switch matrix, and the power supply module provides forward current to the BMS through the switch matrix. During the reverse current test, the power supply module is connected to the BMS in the reverse direction through the switch matrix, and the power supply module provides reverse current to the BMS through the switch matrix. This facilitates the charging and discharging test, overcharge and over-discharge protection test and other operations on the BMS.

[0014] 2) This utility model protects the BMS product during forward and reverse current testing through the circuit protection module. The current detection module detects the current intensity of the output current of the power supply module. When the current intensity exceeds the preset value, the switch matrix is ​​cut off, so that the circuit between the BMS and the power supply module is in an open circuit state, thereby further protecting the BMS product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the electrical connections of this utility model;

[0017] Figure 3 This is a schematic diagram of the power supply module and switch matrix of this utility model;

[0018] Figure 4 This is a schematic diagram of the current detection module structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the power supply module and switch matrix according to another embodiment of the present invention.

[0020] In the diagram: 1. Power supply module; 2. Switch matrix; 3. Circuit protection module; 4. Current detection module; 11. Power supply; 12. First power supply line; 13. Second power supply line; 21. First switch; 22. Second switch; 23. Third switch; 24. Fourth switch; 25. Fifth switch; 26. Sixth switch; 31. TVS diode; 41. Ammeter; 42. Controller; 121. First main circuit; 122. First branch circuit; 123. Second branch circuit; 131. Second main circuit; 132. Third branch circuit; 133. Fourth branch circuit. Detailed Implementation

[0021] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0022] Example

[0023] like Figure 1 and Figure 2 As shown, a reverse current testing fixture for a battery management system is disclosed. The battery management system (BMS) of an electric vehicle is a key component of the battery system in the three-electric system of an electric vehicle, and is a crucial core component for monitoring and protecting the battery system. To improve the product performance and quality of the BMS, a series of factory tests are required. The reverse current testing fixture for the battery management system includes a power supply module 1, which consists of a power source 11, a first power supply line 12, and a second power supply line 13. One end of the first power supply line 12 is connected to the positive terminal (S+) of the power source 11, and one end of the second power supply line 13 is connected to the negative terminal (S-) of the power source 11. A switch matrix 2 is provided between the power supply module 1 and the BMS. The switch matrix 2 is used to connect the BMS to the power supply module 1 in either the forward or reverse direction. A circuit protection module 3 is provided between the switch matrix 2 and the BMS. The fixture also includes a current detection module 4 for detecting the current intensity of the power supply module 1, and the current detection module 4 is also used to disconnect the switch matrix 2 when the current intensity exceeds a preset value.

[0024] This test fixture allows for forward and reverse current testing of BMS products. During forward current testing, the power supply module 1 is connected to the BMS via switch matrix 2. The first power supply line 12 of power supply module 1 is connected to the positive terminal B+ of the BMS via switch matrix 2, and the second power supply line 13 of power supply module 1 is connected to the negative terminal B- of the BMS via switch matrix 2, allowing the power supply 11 of power supply module 1 to provide forward current to the BMS through switch matrix 2. During reverse current testing, the power supply module 1 is connected to the BMS via switch matrix 2. The first power supply line 12 of power supply module 1 is connected to the negative terminal B- of the BMS via switch matrix 2, and the second power supply line 13 of power supply module 1 is connected to the positive terminal B+ of the BMS through switch matrix 2, allowing the power supply 11 of power supply module 1 to provide reverse current to the BMS through switch matrix 2. During the forward and reverse current tests, the circuit protection module 3 protects the BMS product. The current detection module 4 detects the current intensity of the output current of the power supply module 1. When the current intensity exceeds the preset value, the switch matrix 2 is cut off, making the circuit between the BMS and the power supply module 1 open circuit, further protecting the BMS product.

[0025] Specifically, please refer to Figure 3 The switch matrix 2 includes a first switch 21 and a second switch 22 connected in parallel to the positive terminal B+ of the BMS, and a third switch 23 and a fourth switch 24 connected in parallel to the negative terminal B- of the BMS. The first switch 21 and the second switch 22 correspond to the first power supply line 12 and the second power supply line 13, respectively, and the third switch 23 and the fourth switch 24 correspond to the second power supply line 13 and the first power supply line 12, respectively. The first power supply line 12 includes a first main line 121 connected to the positive terminal of the power supply 11, and a first branch line 122 and a second branch line 123 connected to the first main line 121. The first branch line 122 and the second branch line 123 correspond to the first switch 21 and the fourth switch 24, respectively. The second power supply line 13 includes a second main line 131 connected to the negative terminal of the power supply 11, and a third branch line 132 and a fourth branch line 133 connected to the second main line 131. The third branch line 132 and the fourth branch line 133 correspond to the third switch 23 and the second switch 22, respectively.

[0026] During the forward current test, both the first switch 21 and the third switch 23 are turned on, while both the second switch 22 and the fourth switch 24 are turned off. This connects the first main circuit 121 to the positive terminal B+ of the BMS through the first branch 122 and the first switch 21, and connects the second main circuit 131 to the negative terminal B- of the BMS through the third branch 132 and the third switch 23, thus providing forward current to the BMS from the power supply 11. During the reverse current test, both the second switch 22 and the fourth switch 24 are turned on, while both the first switch 21 and the third switch 23 are turned off. This connects the second main circuit 131 to the positive terminal B+ of the BMS through the fourth branch 133 and the second switch 22, and connects the first main circuit 121 to the negative terminal B- of the BMS through the second branch 123 and the fourth switch 24, thus providing reverse current to the BMS from the power supply 11.

[0027] Furthermore, such as Figure 3 and 4As shown, the current detection module 4 is installed on the second main circuit 131. The current detection module 4 includes a current meter 41 installed on the second main circuit 131 and a controller 42 electrically connected to the current meter 41. In other embodiments, the current detection module 4 can also be installed on the first main circuit 121 or on the circuit between the switch matrix and the BMS. During the test, the current meter 41 collects the current intensity data of the second main circuit 131 and sends the current intensity data to the controller 42. When the current intensity exceeds a preset value, it indicates that the test fixture is outputting an abnormally large current. The controller 42 then cuts off the switch matrix 2, making the first switch 21, the second switch 22, the third switch 23, and the fourth switch 24 of the switch matrix 2 all open. The controller 42 is preferably an RX210. The circuit protection module 3 is a high-power TVS diode 31. The two ends of the high-power TVS diode 31 are connected to the positive and negative terminals of the BMS, respectively. This TVS diode 31 can prevent damage to the BMS product caused by abnormal output of the test fixture.

[0028] In other embodiments, the switch matrix 2 may also consist of a fifth switch 25 and a sixth switch 26, each with three terminals. Both the fifth switch 25 and the sixth switch 26 are preferably single-pole double-throw switches. One terminal of the fifth switch 25 is connected to the positive terminal B+ of the BMS, and the other two terminals of the fifth switch 25 correspond to the first power supply line 12 and the second power supply line 13, respectively. One terminal of the sixth switch 26 is connected to the negative terminal B- of the BMS, and the other two terminals of the sixth switch 26 correspond to the first power supply line 12 and the second power supply line 13, respectively. In this embodiment, the current detection module 4 is located on the first power supply line 12. During forward current testing, the fifth switch 25 is connected to the first power supply line 12, and the sixth switch 26 is connected to the second power supply line 13. During reverse current testing, the fifth switch 25 is connected to the second power supply line 13, and the sixth switch 26 is connected to the first power supply line 12.

[0029] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A reverse current testing fixture for a battery management system, comprising a power supply module (1), characterized in that: A switch matrix (2) is provided between the power supply module (1) and the battery management system. The switch matrix (2) is used to connect the battery management system and the power supply module (1) in the correct direction or in reverse. A circuit protection module (3) is provided between the switch matrix (2) and the battery management system. The fixture also includes a current detection module (4) for detecting the current intensity of the power supply module (1). The current detection module (4) is also used to cut off the switch matrix (2) when the current intensity exceeds a preset value.

2. The reverse current testing fixture for the battery management system according to claim 1, characterized in that: The power supply module (1) includes a power supply (11), a first power supply line (12) located at the positive terminal of the power supply (11), and a second power supply line (13) located at the negative terminal of the power supply (11).

3. The reverse current testing fixture for the battery management system according to claim 2, characterized in that: The switch matrix (2) includes a first switch (21) and a second switch (22) connected in parallel to the positive terminal of the battery management system, and a third switch (23) and a fourth switch (24) connected in parallel to the negative terminal of the battery management system. The first switch (21) and the second switch (22) correspond to the first power supply line (12) and the second power supply line (13) respectively, and the third switch (23) and the fourth switch (24) correspond to the second power supply line (13) and the first power supply line (12) respectively.

4. The reverse current testing fixture for the battery management system according to claim 3, characterized in that: The first power supply line (12) includes a first main line (121) connected to the positive terminal of the power supply (11), and a first branch line (122) and a second branch line (123) connected to the first main line (121). The first branch line (122) and the second branch line (123) correspond to the first switch (21) and the fourth switch (24) respectively. The second power supply line (13) includes a second main line (131) connected to the negative terminal of the power supply (11), and a third branch line (132) and a fourth branch line (133) connected to the second main line (131). The third branch line (132) and the fourth branch line (133) correspond to the third switch (23) and the second switch (22) respectively.

5. The reverse current testing fixture for the battery management system according to claim 4, characterized in that: The current detection module (4) is installed on the first main circuit (121) or the second main circuit (131). The current detection module (4) includes a galvanometer (41) and a controller (42) electrically connected to the galvanometer (41).

6. The reverse current testing fixture for the battery management system according to claim 1, characterized in that: The circuit protection module (3) is a TVS diode (31), and the two ends of the TVS diode (31) are respectively connected to the positive terminal and the negative terminal of the battery management system.

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