Current limiting module test system
Through the current limiting module test system, the current value of the current limiting module is detected, which solves the problem of BMS board and battery damage caused by excessive current when the battery pack is connected in parallel, and realizes the effective protection and use effect of the current limiting module.
Patent Information
- Application Number
- CN202421753674.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-24
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-07-24
AI Technical Summary
During the parallel connection of the battery pack, if the pressure difference is large, direct connection will lead to excessive current and damage to the BMS board and battery. The existing technology lacks effective current limiting module testing methods to ensure its use effect.
A current limiting module testing system is designed, including a charging unit, a test fixture, a battery and a current detection unit. By detecting the current value of the current limiting module, it determines whether it meets the design requirements. In the test fixture, the BMU control board and the current limiting module are connected to the detachable structure, and the current detection unit is used to output detection information.
Effective testing of the current limiting module is realized to ensure that it can effectively limit current during the parallel connection of the battery pack, protect the BMS board and battery, and ensure the effectiveness of the current limiting module.
Smart Images
Figure CN223155179U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of battery pack production and processing, and particularly to a current-limiting module testing system. Background Art
[0002] BMS is the low-voltage management system of the power battery pack of an electric vehicle, which together with the battery pack forms the overall battery pack.
[0003] Currently, when battery packs are connected in parallel, if the voltage difference is large, directly connecting them will generate a large current, which may damage the components on the BMS board and the battery. Therefore, we have designed a current-limiting module that can be connected to the pre-configured connection terminals on the BMU control board of the BMS. It can limit the current to a set value during the parallel connection process of the battery packs, protecting the components on the BMS board and the battery. To ensure that the produced current-limiting module can achieve the above-mentioned expected use effect, this application proposes a new technical solution. Utility Model Content
[0004] To ensure that the current-limiting module of the battery pack can achieve the expected use effect, this application provides a current-limiting module testing system.
[0005] This application provides a current-limiting module testing system, adopting the following technical solution:
[0006] A current-limiting module testing system includes a charging unit, a test fixture, a storage battery, and a current detection unit;
[0007] Among them, the test fixture includes a base, a switching power supply, and a BMU control board. The BMU control board and the switching power supply are installed on the base. The switching power supply is electrically connected to the BMU control board and is used to supply power to the BMU control board. The connection terminal of the BMU control board for connecting the current-limiting module is set as a detachable connection structure;
[0008] The charging unit is electrically connected to the BMU control board and forms a loop with the storage battery
[0009] The current detection unit is used to detect the output current of the charging unit and / or the input current of the storage battery, and output the detection information.
[0010] Optionally, a first switching unit is connected in series on the output side of the charging unit, and a second switching unit is connected in series on the input side of the storage battery.
[0011] Optionally, the first switching unit and the second switching unit each include at least one air switch or circuit breaker.
[0012] Optionally, the first switching unit and the second switching unit each include any one of a boat switch, a toggle switch, a knife switch, and a push-button switch.
[0013] Optionally, the interior of the base is a hollow structure. The BMU control board and the switching power supply are placed inside the base. The base is provided with a bayonet on the side where the BMU control board is used to connect to the current limiting module, and the bayonet is adaptively connected to the current limiting module of the BMU control board.
[0014] Optionally, the bayonet is recessed to form a yielding opening, and the yielding opening is at least used for a finger to penetrate.
[0015] Optionally, the current detection unit includes any one of a multimeter, a current sensor, and a current sampling circuit.
[0016] Optionally, the switching power supply includes a mains converter or a DC power supply.
[0017] Optionally, the charging unit includes a constant voltage power supply.
[0018] Optionally, the storage battery includes a lead-acid battery.
[0019] In summary, the present application includes at least one of the following beneficial technical effects: It is possible to determine whether the current limiting module meets the design requirements by detecting the input current of the charging unit and / or the output current of the storage battery. Description of the Drawings
[0020] Figure 1 is a schematic diagram of the overall circuit structure of the present application;
[0021] Figure 2 is a schematic diagram of the structure of the base of the present application;
[0022] Figure 3 is a schematic diagram of the usage mode of a certain current detection unit of the present application.
[0023] Description of the reference numerals: 1. Charging unit; 2. Test fixture; 21. Base; 211. Bayonet; 212. Yielding opening; 3. Storage battery; 4. Current detection unit. Detailed Embodiment
[0024] The following further describes the present application in detail Figures 1 - 3 with reference to the accompanying drawings.
[0025] The embodiment of the present application discloses a current limiting module testing system.
[0026] Referring to Figures 1 - 3 , the current limiting module testing system includes a charging unit 1, a test fixture 2, a storage battery 3, and a current detection unit 4.
[0027] Among them, the test fixture includes a base 21, a switching power supply, and a BMU control board. The switching power supply and the BMU control board are both installed on the base 21. In this embodiment, the switching power supply can be a mains converter. For example, a charging head that converts 220V AC to 24V DC. The output end of the switching power supply is electrically connected to the power supply end of the BMU control board.
[0028] In another embodiment, the switching power supply can also be a DC power supply. For example, a 24V battery pack.
[0029] In one embodiment, in order to guide and limit the current-limiting module and prevent it from sliding and affecting the test process, the base 21 is set as a box structure with a hollow interior, and the box is spliced and fixed; the switching power supply and the BMU control board are placed inside the box.
[0030] Suppose there is a connection end for connecting the current-limiting module at the upper part of the BMU control. This connection end is set as a detachable connection structure. For example, the connection end is a terminal structure or a pin header structure. At this time, the corresponding connection end of the current-limiting module can be adjusted to an adapted structure.
[0031] Refer to Figure 2 , a bayonet 211 communicating with the inside is opened at the upper part of the base 21, and the above-mentioned terminals and pin headers are located directly below the bayonet 211 for connecting the current-limiting module during the test.
[0032] In order to remove the current-limiting module that has completed the test, assume that the bayonet 211 is rectangular when viewed from above. Then, four inner edges of the bayonet 211 are respectively recessed inward to form a recess 212, and the recess 212 is at least used for a finger to reach in.
[0033] In one embodiment, the charging unit 1 includes a constant voltage power supply, and this power supply has at least one DC output, and the output voltage can be 54V; the constant voltage power supply has a lower cost compared to the adjustable power supply.
[0034] The positive pole of the charging unit 1 is connected to the positive pole of the storage battery 3 through a wire, and the negative pole of the charging unit 1 is electrically connected to the S pole of the discharge MOS tube of the BMU control board.
[0035] The storage battery 3 includes a lead-acid battery, which is relatively safe to use and has a lower cost. The negative pole of the storage battery 3 is connected to the S pole of the charging MOS tube of the BMU control board.
[0036] The current detection unit 4 is used to detect the output current of the charging unit 1 and / or the input current of the storage battery 3, and output the detection information.
[0037] Usage process:
[0038] First, power on the switching power supply to supply power for the BMU control. Then, insert the current limiting module into the BMU control board. Next, turn on the charging unit 1 to make the charging unit 1 charge the storage battery 3. If the detection information (i.e., the current value) output by the current detection unit 4 is the same as the current limiting value designed by the current limiting module at this time, it means that the current limiting board is normal and is a qualified product; otherwise, it is a defective product.
[0039] Refer to Figure 3 , in one embodiment, the current detection unit 4 includes any one of a multimeter, a current sensor, and a current sampling circuit.
[0040] The usage methods of the multimeter and the current sensor (such as: Hall type) are prior arts. The attached drawings show the Hall type, so they will not be elaborated here. For the current sampling circuit, an existing circuit structure with a sampling accuracy meeting the usage requirements can be selected.
[0041] It can be understood that if it is a current sensor or a current sampling circuit, the system can also be configured with a single-chip microcomputer electrically connected to any one of them, and the single-chip microcomputer should have a display for the staff to read the current value.
[0042] In one embodiment, for safety testing and other considerations, a switch unit one is connected in series on the output side of the charging unit 1, and a switch unit two is connected in series on the input side of the storage battery 3.
[0043] The switch unit one and the switch unit two each include at least one air switch or circuit breaker, and are wired to the normally open contacts.
[0044] In another embodiment, the switch unit one and the switch unit two can each include any one of a boat switch, a toggle switch, a knife switch, and a push-button switch, which can enable the staff to control when to start and pause the test.
[0045] The above are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore: All equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.
Claims
1. A current-limiting module testing system, characterized in that: It includes a charging unit (1), a test fixture (2), a storage battery (3), and a current detection unit (4); Among them, the test fixture (2) includes a base (21), a switching power supply, and a BMU control board. The BMU control board and the switching power supply are installed on the base (21). The switching power supply is electrically connected to the BMU control board and is used to supply power to the BMU control board. The connection end of the BMU control board for connecting the current limiting module is set as a detachable connection structure; The charging unit (1) is electrically connected to the BMU control board and forms a loop with the storage battery (3); The current detection unit (4) is used to detect the output current of the charging unit (1) and / or the input current of the storage battery (3), and output detection information.
2. The current-limiting module testing system according to claim 1, wherein: A first switching unit is connected in series on the output side of the charging unit (1), and a second switching unit is connected in series on the input side of the storage battery (3).
3. The current-limiting module testing system according to claim 2, characterized in that: Each of the first switching unit and the second switching unit includes at least one air switch or circuit breaker.
4. The current limiting module testing system according to claim 2, characterized in that: Each of the first switching unit and the second switching unit includes any one of a boat switch, a toggle switch, a knife switch, and a push-button switch.
5. The current-limiting module testing system according to claim 1, wherein: The interior of the base (21) is of a hollow structure. The BMU control board and the switching power supply are placed inside the base (21). A bayonet (211) is formed on one side of the base (21) where the BMU control board is used to connect the current limiting module, and the bayonet (211) is adaptively connected to the current limiting module of the BMU control board.
6. The current-limiting module testing system according to claim 5, wherein: The bayonet (211) is recessed to form a yielding opening (212), and the yielding opening (212) is at least used for a finger to reach in.
7. The current-limiting module testing system according to claim 1, characterized in that: The current detection unit (4) includes any one of a multimeter, a current sensor, and a current sampling circuit.
8. The current-limiting module testing system according to claim 1, characterized in that: The switching power supply includes a mains converter or a DC power supply.
9. The current-limiting module testing system according to claim 1, wherein: The charging unit (1) includes a constant voltage power supply.
10. The current-limiting module testing system according to claim 1, wherein: The storage battery (3) includes a lead-acid battery.