A cell insulation testing device for battery modules

Abstract

This utility model discloses a cell insulation testing device for a battery module. The battery module includes a housing and multiple cells installed inside the housing. The testing device includes: a testing platform with multiple conductive test probes corresponding one-to-one with the cells mounted on its lower side; a positioning component disposed on the lower surface of the testing platform, which cooperates with the housing of the battery module to position the testing platform on the housing and ensure that the multiple test probes contact the corresponding cells; a first test cable and a second test cable, respectively connecting two adjacent cells; and a detector having a first test terminal for applying a test voltage and a second test terminal for detecting current. The detector, the first test cable, the second test cable, and the multiple cells together form a closed test circuit. The advantage of this utility model is that it can complete the insulation test of all adjacent cells in the battery module at one time, resulting in high testing efficiency.

Description

Technical Field

[0001] This utility model relates to a battery module cell insulation testing fixture, belonging to the field of battery testing. Background Technology

[0002] After the power battery module is assembled, the cells are connected through busbars. If there is poor insulation between the cells, it is equivalent to creating a micro-short circuit through the busbars. The cells will continue to discharge through the poor insulation, leading to inconsistent state of charge (SOC) and even safety risks such as overheating and fire. To ensure that the impedance between the cells meets the requirements, insulation impedance testing between the cells is generally performed before welding the busbars.

[0003] As customers demand increasingly higher energy density from battery packs, large-module solutions are becoming more widely used. The number of cells in each module is multiplying, leading to a corresponding increase in testing costs and the probability of defects. Current insulation testing methods typically involve connecting an insulation withstand voltage tester to each cell and its adjacent terminals. This requires testing adjacent cells pair by pair, resulting in low testing efficiency when the number of cells in each module is large. Utility Model Content

[0004] The purpose of this invention is to provide a battery module cell insulation testing fixture that can complete the insulation test of all adjacent cells in the battery module at one time, with high testing efficiency.

[0005] This utility model is achieved through the following technical solution.

[0006] A cell insulation testing device for a battery module, the battery module including a housing and a plurality of cells installed inside the housing, the testing device comprising: The test platform has multiple conductive test probes installed on its lower side, each corresponding to one of the battery cells. A positioning component is disposed on the lower surface of the test platform. The positioning component cooperates with the housing of the battery module to position the test platform on the housing and to make the plurality of test probes contact the corresponding battery cells. The first test cable and the second test cable are connected to two adjacent battery cells respectively through different test probes; The detector has a first test terminal for applying a test voltage and a second test terminal for detecting current. When the first test terminal and the second test terminal are electrically connected to the first test cable and the second test cable respectively, the detector, the first test cable, the second test cable, and the plurality of battery cells together constitute a test closed loop.

[0007] As a further improvement of this utility model, the upper surface of the test platform is provided with two cable terminals, which are respectively connected to the first test cable and the second test cable.

[0008] As a further improvement of this utility model, the test platform fixes the test probe by a clamping assembly. The clamping assembly has a mounting hole for fixing the test probe. The test probe is inserted into and fixed in the mounting hole, and a portion of the test probe is exposed on the underside of the clamping assembly.

[0009] As a further improvement of this utility model, a through hole is provided on the test platform corresponding to the position of the test probe, and the test probe extends into the through hole; the first test cable and the second test cable are provided on the upper surface of the test platform, and the first test cable and the second test cable are connected to the corresponding test probe through the through hole.

[0010] As a further improvement of this utility model, the clamping assembly includes two clamping blocks that can be detachably fixed. The diameter of the mounting hole is slightly smaller than the outer diameter of the test probe. The mounting hole is formed between the two clamping blocks. When the test probe is located in the fixing hole, the two clamping blocks clamp and fix the test probe.

[0011] As a further improvement of this utility model, the test platform is detachably connected to the clamping assembly; the test platform is provided with at least one first connection hole for each clamping assembly, and the clamping assembly is provided with a second connection hole corresponding to the first connection hole, and the fastener passes through the first connection hole and the second connection hole to detachably connect the test platform and the clamping assembly.

[0012] As a further improvement of this utility model, the positioning component includes a plurality of positioning blocks, and the positioning blocks are provided with positioning grooves for embedding the housing.

[0013] As a further improvement of this utility model, the upper surface of the testing platform is provided with two spaced handrails for the operator's hands to grip.

[0014] As a further improvement of this utility model, the detector is configured as an insulation withstand voltage tester.

[0015] The beneficial effects of this utility model are: By cooperating with the positioning component and the housing in the battery module, multiple test probes can make simultaneous contact with all the cells in the battery module at one time. The first test cable and the second test cable connect adjacent cells to different circuits respectively, forming a closed test circuit with the detector. This allows for insulation testing of all adjacent cells at one time, eliminating the need to test adjacent cells one pair at a time. Compared with existing technologies, this significantly improves testing efficiency. Attached Figure Description

[0016] The preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of this utility model, wherein: Figure 1 A top view of the test platform; Figure 2 This is a bottom view of the test platform; Figure 3 This is a schematic diagram of the battery module structure; Figure 4 This is a side view of the test platform; Figure 5 This is a schematic diagram of the clamping assembly. Figure 6 A schematic diagram of the circuit connection for a single row of battery cells; Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0018] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0019] This embodiment provides a cell insulation testing device for a battery module, used to perform insulation testing on multiple cells m2 within a battery module m, referring to... Figures 1-6The battery module m includes a housing m1 and multiple battery cells m2 installed inside the housing m1. The testing device includes a testing platform 1, a positioning component, a first testing cable 41, a second testing cable 42, and a detector a. The testing platform 1 is a plate-shaped structure with multiple conductive test probes 2 that correspond one-to-one with the battery cells m2 installed on its lower side. The positioning component is located on the lower surface of the testing platform 1. The positioning component cooperates with the housing m1 of the battery module m to position the testing platform 1 on the housing m1 and to make the test probes 2 contact the corresponding battery cells m2. The first testing cable 41 and the second testing cable 42 are connected to two adjacent battery cells m2 respectively through different test probes 2.

[0020] The detector a has a first test terminal (not shown in the figure) for applying a test voltage and a second test terminal (not shown in the figure) for detecting current. When the first test terminal and the second test terminal are electrically connected to the first test cable 41 and the second test cable 42 respectively, the detector a, the first test cable 41, the second test cable 42 and the multiple battery cells m2 together form a test closed loop.

[0021] Before testing, the test platform 1 is positioned on the housing m1 of the battery module m using the positioning component, ensuring that the multiple conductive test probes 2 on the lower surface of the test platform 1 are in contact with the terminals of each cell m2 in the battery module m. The first test end of the detector a is connected to the first test cable 41, and the second test end is connected to the second test cable 42 to form a closed test loop.

[0022] During testing, a test voltage (e.g., 500V) is applied by detector a through the first test terminal, and the leakage current is detected through the second test terminal. At this time, the current flows through the insulating medium between all adjacent cells m2, and the insulation performance between adjacent cells m2 is determined by the leakage current in the circuit.

[0023] In this embodiment, the positioning component cooperates with the housing m1 in the battery module m to achieve simultaneous contact between multiple test probes 2 and all cells m2 in the battery module m. The first test cable 41 and the second test cable 42 connect adjacent cells m2 to different circuits to form a closed test circuit. The insulation performance between all adjacent cells m2 can be directly detected at one time without the need for pairwise testing. Compared with the pairwise testing in the prior art, the testing efficiency is significantly improved.

[0024] In addition, the positioning component and the housing m1 are positioned together to ensure that the test probe 2 can accurately contact the cell m2, avoiding the error of traditional manual alignment and helping to improve the accuracy of the test.

[0025] It should be noted that in this embodiment, the multiple battery cells m2 in the battery module m are arranged in two rows, as shown in the reference. Figure 3The cells m2 are sorted, with the first test cable 41 connecting the odd-numbered cells m2 and the second test cable 42 connecting the even-numbered cells m2, forming alternating groups.

[0026] In this embodiment, detector a can be configured as an insulation withstand voltage tester, which can be used to test the insulation performance of cell m2 independently. Alternatively, detector a can also be composed of a combination of a high-voltage discharge device and a current detection device.

[0027] In this embodiment, the upper surface of the test platform 1 is provided with two terminal blocks 5. The two terminal blocks 5 are respectively connected to one end of the first test cable 41 and one end of the second test cable 42. The first test cable 41 and the second test cable 42 can be connected to the corresponding terminal blocks by welding or winding. Therefore, during testing, the first and second test ends can be directly connected to the terminal blocks 5. Since the terminal blocks 5 are fixed to the operating platform, a stable connection can be achieved with the first test cable 41 and the second test cable 42, and it is not easily loosened due to vibration or pulling, thus achieving stable contact. The design of the terminal blocks 5 makes the contact operation between the detector a and the first and second test cables 41 and 42 simpler. Furthermore, standardized interfaces can be installed on the terminal blocks 5 for convenient connection.

[0028] In this embodiment, the test platform 1 is fixedly mounted with the test probe 2 by the clamping component 6. The clamping component 6 has a mounting hole 61 for fixing the test probe 2. The test probe 2 is inserted into and fixed in the mounting hole 61. The test probe 2 is partially exposed on the lower side of the clamping component 6. During the test, the lower end of the test probe 2 contacts the terminal post of the battery cell m2. The clamping component 6 can fix the test probe to ensure the positional stability of the test probe 2, thereby ensuring the contact stability between the test probe 2 and the battery cell m2 and avoiding poor contact that would affect the test results.

[0029] Meanwhile, a through hole 11 is provided on the test platform 1 at the position corresponding to the test probe 2, and the test probe 2 extends into the through hole 11. The first test cable 41 and the second test cable 42 are provided on the upper surface of the test platform 1. The first test cable 41 and the second test cable 42 are connected to the corresponding test probe 2 through the through hole 11. Here, the test probe 2 can be directly soldered to the first test cable 41 and the second test cable 42 or connected through a wire.

[0030] Multiple through holes 11 on the test platform 1 are set one-to-one with multiple test probes 2 installed below the test platform 1.

[0031] In this embodiment, the clamping assembly 6 includes two detachable and fixed clamping blocks 62, which can be fixed by bolts. The diameter of the mounting hole 61 is slightly smaller than the outer diameter of the test probe 2, and the mounting hole 61 is formed between the two clamping blocks 62. When the test probe 2 is located in the mounting hole 61, the two clamping blocks 62 clamp and fix the test probe 2, preventing the test probe 2 from loosening or falling off during testing. Furthermore, the detachable structure of the clamping assembly 6 supports quick replacement of damaged test probes 2, reducing maintenance costs and time. Furthermore, the test platform 1 is detachably connected to the clamping assembly 6, thus allowing for the replacement of the position of the test probe 2 on the test platform 1 to accommodate different cell m2 arrangement specifications. Specifically, the test platform 1 has at least one first connecting hole (not shown in the figure) for each clamping assembly 6, and the clamping assembly 6 has a second connecting hole 63 corresponding to the first connecting hole. Fasteners 12 pass through the first connecting hole and the second connecting hole 63 to detachably connect the test platform 1 and the clamping assembly 6. Here, the fastener 12 can be a bolt, that is, the second connecting hole 63 is a screw hole that mates with the fastener 12.

[0032] It should be noted that the test platform 1 and the clamping assembly 6 in this test device are both non-conductive, meaning they are both made of insulating materials to avoid interference with the test results.

[0033] In this embodiment, the positioning component includes multiple positioning blocks 3, each with a positioning groove 31 for embedding into the housing m1. The positioning groove 31 engages with the housing m1, enabling rapid alignment of the test platform 1 and reducing manual adjustment time. The positions of the positioning blocks 3 correspond to the corner distribution of the housing m1, contributing to improved stability of the test platform 1.

[0034] In addition, the upper surface of the test platform 1 is equipped with two spaced handrails for operators to grip, facilitating the handling of the test platform 1. The two handrails can be positioned on either side of the test platform 1 in the front-to-back direction to prevent operators from accidentally touching probes or cables while handling the test platform 1, thus improving operational safety.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A cell insulation testing device for a battery module, characterized in that, The battery module (m) includes a housing (m1) and multiple battery cells (m2) installed inside the housing (m1). The testing device includes: The test platform (1) has multiple conductive test probes (2) that correspond one-to-one with the battery cell (m2) installed on its lower side. A positioning component is disposed on the lower surface of the test platform (1). The positioning component cooperates with the housing (m1) of the battery module (m) to position the test platform (1) on the housing (m1) and to make multiple test probes (2) simultaneously contact the corresponding battery cell (m2). The first test cable (41) and the second test cable (42) are connected to two adjacent cells (m2) respectively through different test probes (2); The detector (a) has a first test terminal for applying a test voltage and a second test terminal for detecting current. When the first test terminal and the second test terminal are electrically connected to the first test cable (41) and the second test cable (42) respectively, the detector (a), the first test cable (41), the second test cable (42) and the multiple battery cells (m2) together form a test closed loop.

2. The cell insulation testing device for a battery module according to claim 1, characterized in that, The upper surface of the test platform (1) is provided with two terminals (5), which are respectively connected to the first test cable (41) and the second test cable (42).

3. The cell insulation testing device for a battery module according to claim 1, characterized in that, The test platform (1) fixes the test probe (2) by a clamping assembly (6). The clamping assembly (6) has a mounting hole (61) for fixing the test probe (2). The test probe (2) is inserted into and fixed in the mounting hole (61). The test probe (2) is partially exposed on the underside of the clamping assembly (6).

4. The cell insulation testing device for a battery module according to claim 3, characterized in that, The test platform (1) has a through hole (11) at the position corresponding to the test probe (2), and the test probe (2) extends into the through hole (11); the first test cable (41) and the second test cable (42) are disposed on the upper surface of the test platform (1), and the first test cable (41) and the second test cable (42) are connected to the corresponding test probe (2) through the through hole (11).

5. The cell insulation testing device for a battery module according to claim 3, characterized in that, The clamping assembly (6) includes two clamping blocks (62) that can be detachably fixed. The diameter of the mounting hole (61) is slightly smaller than the outer diameter of the test probe (2). The mounting hole (61) is formed between the two clamping blocks (62). When the test probe (2) is located in the mounting hole (61), the two clamping blocks (62) clamp and fix the test probe (2).

6. The cell insulation testing device for a battery module according to claim 3, characterized in that, The test platform (1) is detachably connected to the clamping assembly (6); the test platform (1) is provided with at least one first connection hole for each clamping assembly (6), and the clamping assembly (6) is provided with a second connection hole (63) corresponding to the first connection hole. The fastener (12) passes through the first connection hole and the second connection hole (63) to detachably connect the test platform (1) and the clamping assembly (6).

7. The cell insulation testing device for a battery module according to claim 1, characterized in that, The positioning component includes multiple positioning blocks (3), and the positioning blocks (3) are provided with positioning grooves (31) for embedding the housing (m1).

8. The cell insulation testing device for a battery module according to claim 1, characterized in that, The upper surface of the test platform (1) is provided with two spaced handrails for the operator's hands to hold.

9. A cell insulation testing device for a battery module according to any one of claims 1 to 8, characterized in that, The detector (a) is configured as an insulation withstand voltage tester.

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