Test fixture for pouch batteries

Abstract

This utility model relates to a test fixture for pouch batteries, comprising a frame assembly, a test assembly, and a drive assembly. The frame assembly includes a first slide bar and a second slide bar arranged in parallel. The test assembly includes a clamping component and a test wiring harness. The clamping component includes two overlapping first clamping plates and a second clamping plate, both of which are slidably connected to the first slide bar. The pouch battery is clamped between the first and second clamping plates and electrically connected to the test wiring harness. The second slide bar abuts against the bottom of the pouch battery to support it. The drive assembly is disposed on the frame assembly and is used to drive the first and second clamping plates to compress the pouch battery. This test fixture offers high testing efficiency, high accuracy of test data, and avoids circuit interruptions during testing.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a test fixture for a soft-pack battery. Background Technology

[0002] In recent years, my country's new energy vehicle industry has developed rapidly, and power batteries, as the power source for new energy vehicles, have been widely used. Pouch batteries are a type of power battery, characterized by their light weight, high energy density, good safety, and flexible design. During the development phase, pouch batteries require electrical performance testing to characterize their performance. During testing, specialized fixtures are used to compress the pouch battery to simulate its stress state under usage conditions and to obtain various electrical performance data.

[0003] In related technologies, the fixture used for testing includes two clamping plates, with the pouch battery sandwiched between them. Screws are used to secure the clamping plates, ensuring the pouch battery is firmly held in place. Test wiring harnesses are also mounted on the clamping plates and connected to the tabs of the pouch battery. During testing, assembling multiple sets of screws is time-consuming, and variations in the torque applied by operators can lead to uneven stress on the pouch battery, affecting the accuracy of test data. Furthermore, due to the low mechanical strength of the tabs, the connection between the tabs and the test wiring harness is easily detached under external pulling forces, disrupting the normal operation of the test. Utility Model Content

[0004] The purpose of this invention is to provide a test fixture for soft-pack batteries, which has high testing efficiency, high accuracy of test data, and can avoid circuit disconnection during the test.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A test fixture for a pouch battery is provided, comprising a frame assembly, a test assembly, and a drive assembly. The frame assembly includes a first slide bar and a second slide bar arranged in parallel. The test assembly includes a clamping member and a test wiring harness disposed on the clamping member. The clamping member includes two overlapping first clamping plates and a second clamping plate, both of which are slidably connected to the first slide bar. The pouch battery is clamped between the first clamping plate and the second clamping plate and is electrically connected to the test wiring harness. The second slide bar abuts against the bottom of the pouch battery to support it. The drive assembly is disposed on the frame assembly and is used to drive the first clamping plate and the second clamping plate to compress the pouch battery.

[0007] Furthermore, the first slide rod is inserted at least at the four corners of the first clamping plate and the second clamping plate.

[0008] Furthermore, both the side of the first clamping plate opposite to the second clamping plate and the side of the second clamping plate opposite to the first clamping plate are provided with protruding support rings, and the first sliding rod passes through the support rings.

[0009] Furthermore, there are multiple second slide rods, which are spaced apart along the length of the soft-pack battery, and the second slide rods pass through the first clamping plate and the second clamping plate.

[0010] Furthermore, one of the first clamping plate and the second clamping plate is provided with a current-conducting terminal, which is connected to the test wiring harness. The other of the first clamping plate and the second clamping plate is provided with an elastic pressure block, which faces the current-conducting terminal and is used to press the tab of the soft-pack battery onto the current-conducting terminal.

[0011] Furthermore, the frame assembly also includes a support member and end plates disposed at both ends of the support member. The ends of the first slide rod and the second slide rod are respectively connected to the two end plates. The support member is provided with a cable management buckle for fixing the test cable harness.

[0012] Furthermore, there are multiple clamping members, which are arranged sequentially along the length of the first slide bar. An isolation block is provided between two adjacent clamping members, and the two adjacent clamping members are spaced apart to form a heat dissipation gap.

[0013] Furthermore, the drive assembly includes a screw, a push head, and a push base. The screw is threadedly connected to one of the end plates. The push head is disposed at one end of the screw facing the clamping member. The push base is disposed on the clamping member near the screw. The push head and the push base are interlocked.

[0014] Furthermore, the isolation block is coaxial with the screw.

[0015] Furthermore, an operating handle is provided at the end of the screw that is away from the push head.

[0016] The beneficial effects of this invention are as follows: By setting a clamping component that slides between itself and the first sliding rod, the pouch battery is installed between the first and second clamping plates. The first and second clamping plates can then be driven by a drive assembly to slide on the first sliding rod, clamping the pouch battery and simulating a scenario where the pouch battery is being squeezed. Electrical performance data of the pouch battery is then obtained through a test harness. Compared to existing technologies, there is no need to use screws to fasten the clamping component, which improves testing efficiency and avoids uneven force on the pouch battery caused by torque differences during screw assembly, thereby improving the accuracy of test data. By setting a second sliding rod to support the bottom of the pouch battery, the pouch battery is supported by the second sliding rod during testing, reducing the tension between the battery tabs and the test harness, thus preventing the tabs from detaching and ensuring the reliability of the electrical connection during testing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a test fixture for a soft-pack battery according to an embodiment of the present invention.

[0018] Figure 2 This is an exploded view of the test fixture for a soft-pack battery according to an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the clamping member and driving assembly according to an embodiment of the present utility model.

[0020] Figure 4 This is a schematic diagram of the first clamping plate in an embodiment of the present utility model.

[0021] Figure 5 This is a schematic diagram of the second clamping plate in an embodiment of the present utility model.

[0022] Figure 6 This is a schematic diagram of the installation of the isolation block according to an embodiment of the present utility model.

[0023] In the picture:

[0024] 1. Frame assembly; 11. End plate; 12. First slide bar; 13. Second slide bar; 14. Support component; 141. Cable management buckle; 15. Reinforcing sleeve; 16. Reinforcing frame; 17. Fastener; 18. Cable tie; 2. Test assembly; 21. Clamping component; 211. First clamping plate; 212. Second clamping plate; 213. First through hole; 214. Second through hole; 215. Mounting slot; 216. Support ring; 217. Current guiding terminal; 218. Elastic pressure block; 22. Charge / discharge harness; 23. Voltage monitoring harness; 3. Drive assembly; 31. Screw; 32. Operating handle; 33. Push head; 34. Push base; 341. Groove; 4. Isolation block; 5. Soft-pack battery; 51. Tab. Detailed Implementation

[0025] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] like Figures 1 to 6 As shown, this embodiment provides a test fixture for a pouch battery, including a frame assembly 1, a test assembly 2, and a drive assembly 3. The frame assembly 1 provides overall support and includes a first slide bar 12 and a second slide bar 13 arranged in parallel. Both the first slide bar 12 and the second slide bar 13 are round rod structures, and their lengths extend along the length direction of the frame assembly 1 (X direction in the figure). The test assembly 2 is used to clamp and fix the pouch battery 5. The test assembly 2 includes a clamping member 21 and a test wiring harness. The clamping member 21 includes two overlapping clamping plates 211 and 212 arranged along the length direction of the frame assembly 1. Both the first clamping plate 211 and the second clamping plate 212 are slidably connected to the first slide bar 12, so that the entire clamping member 21 can slide along the length direction of the first slide bar 12. The pouch battery 5 is clamped between the first clamping plate 211 and the second clamping plate 212, and the pouch battery 5 is electrically connected to the test wiring harness. The second slide bar 13 abuts against the bottom of the soft-pack battery 5, and the second slide bar 13 serves to support the soft-pack battery 5. The drive assembly 3 is disposed on the frame assembly 1, and the output end of the drive assembly 3 abuts against the clamping member 21. The drive assembly 3 is used to drive the first clamping plate 211 and the second clamping plate 212 to squeeze the soft-pack battery 5.

[0027] Understandably, by setting the clamping member 21 to slide connected to the first slide rod 12, the soft-pack battery 5 is installed between the first clamping plate 211 and the second clamping plate 212. The driving component 3 can then drive the first clamping plate 211 and the second clamping plate 212 to slide on the first slide rod 12, so that the first clamping plate 211 and the second clamping plate 212 clamp the soft-pack battery 5, simulating the application scenario where the soft-pack battery 5 is squeezed. Then, the electrical performance data of the soft-pack battery 5 is obtained through the test harness. Compared with the prior art, there is no need to use screws to fasten the clamping member 21, which is beneficial to improve testing efficiency and avoid uneven force on the soft-pack battery 5 due to torque differences when assembling screws, thereby improving the accuracy of test data. By setting the second slide rod 13 to support the bottom of the soft-pack battery 5, during the test, the soft-pack battery 5 is supported by the second slide rod 13, reducing the tension between the tab 51 of the soft-pack battery 5 and the test harness, thereby preventing the tab 51 from falling off the test harness.

[0028] Specifically, refer to Figure 1 and Figure 2As shown, the frame assembly 1 also includes end plates 11, support members 14, reinforcing sleeves 15, and reinforcing frames 16. There are two end plates 11, which are parallel and spaced apart along the length of the frame assembly 1. Support members 14 are positioned between the two end plates 11, with both ends of the support member 14 connected and fixed to the two end plates 11 via fasteners 17. The fasteners 17 are screws and washers used with the screws. The end plates 11 are square plate structures, and there are four support members 14, located at the four corners of the end plates 11, so that the end plates 11 and the support members 14 form a structurally stable cuboid frame. Several cable management clips 141 are provided on the support members 14, and the test cable harnesses are bundled to the cable management clips 141 via cable ties 18 to achieve neat organization of the test cable harnesses. The reinforcing frame 16 is a square frame structure, and the reinforcing frame 16 is installed on the end plates 11 via fasteners 17 to strengthen the structural strength of the end plates 11. The drive assembly 3 is mounted on one of the end plates 11. To improve the structural strength of the connection area between the drive assembly 3 and the end plate 11, a reinforcing sleeve 15 is provided on the end plate 11 corresponding to the mounting position of the drive assembly 3. A first slide rod 12 and a second slide rod 13 are positioned between the two end plates 11. The two ends of the first slide rod 12 are respectively connected and fixed to the two end plates 11 by fasteners 17, and the two ends of the second slide rod 13 are also respectively connected and fixed to the two end plates 11 by fasteners 17. Four first slide rods 12 are provided, distributed at the four corners of the clamping member 21. Because the four corners of the clamping member 21 are slidably connected to the first slide rods 12, the entire clamping member 21 is subjected to uniform force, allowing for smoother sliding along the first slide rods 12. Two second slide rods 13 are provided, spaced apart along the width direction of the frame assembly 1. By providing two second slide rods 13, it is beneficial to increase the support points for the bottom of the soft-pack battery 5, improving the support effect.

[0029] Specifically, refer to Figures 4 to 6As shown, the test assembly 2 includes a clamping member 21 and a test wiring harness. The clamping member 21 is used to clamp the pouch battery 5, and the test assembly 2 is used to electrically connect with the pouch battery 5 to obtain electrical performance data of the pouch battery 5 during the compression process. The clamping member 21 includes a first clamping plate 211, a second clamping plate 212, a current-conducting terminal 217, and an elastic pressure block 218. The first clamping plate 211 and the second clamping plate 212 have a square plate structure. The four corners of the first clamping plate 211 are provided with first through holes 213, and the first sliding rod 12 passes through the first through holes 213 on the first clamping plate 211 to achieve a sliding connection between the first clamping plate 211 and the first sliding rod 12. The four corners of the second clamping plate 212 are provided with first through holes 213, and the first sliding rod 12 passes through the first through holes 213 on the second clamping plate 212 to achieve a sliding connection between the second clamping plate 212 and the first sliding rod 12. The first through hole 213 on the first clamping plate 211 is aligned with the first through hole 213 on the second clamping plate 212. Two current-conducting terminals 217, made of copper sheet, are spaced apart at the top of the first clamping plate 211, corresponding to the positive and negative terminals of the pouch battery 5, respectively. The test wiring harness includes a charge / discharge wiring harness 22 and a voltage monitoring wiring harness 23, both connected to the current-conducting terminals 217. Two mounting slots 215 are provided on the second clamping plate 212, each containing an elastic pressure block 218 extending beyond the mounting slot. The two elastic pressure blocks 218 correspond one-to-one with the two tabs 51 on the pouch battery 5. The bottoms of the first clamping plate 211 and the second clamping plate 212 have second through holes 214 for the second sliding rod 13 to pass through. The second sliding rod 13 passes through the second through hole 214. During testing, the pouch battery 5 is placed between the first clamping plate 211 and the second clamping plate 212, with its bottom resting on the second slide bar 13, and its two tabs 51 abutting against the two current-conducting terminals 217 respectively. Under the pressure of the clamping member 21, the tabs 51 are clamped between the current-conducting terminals 217 and the elastic pressure block 218 to achieve an electrical connection between the test harness and the pouch battery 5.

[0030] In another embodiment, the current-conducting terminal 217 can also be mounted on the second clamping plate 212, and correspondingly, the elastic pressure block 218 is mounted on the first clamping plate 211. That is, the current-conducting terminal 217 is provided on one of the first clamping plate 211 and the second clamping plate 212, and the elastic pressure block 218 is provided on the other, with the elastic pressure block 218 facing the current-conducting terminal 217. When the clamping member 21 clamps the soft-pack battery 5, the elastic pressure block 218 can press the tab 51 tightly onto the current-conducting terminal 217. This structure can achieve electrical connection without the need for corresponding assembly of the tab 51, making the entire testing work more convenient and efficient.

[0031] In another embodiment, the number of first slide bars 12 can be five, six, or other numbers. The first slide bars 12 serve to support and guide the clamping member 21, and are distributed around the clamping member 21, with the distribution of multiple first slide bars 12 on the clamping member 21 being uniform. The number of second slide bars 13 can be three, four, or other numbers. Multiple second slide bars 13 are spaced apart along the length of the pouch battery 5. The second slide bars 13 support the pouch battery 5 to prevent the tabs 51 from separating from the current-conducting terminals 217. Furthermore, since the pouch battery 5 is placed on the second slide bars 13, installation of the pouch battery 5 is convenient. During testing, simply place the pouch battery 5 between the first clamping plate 211 and the second clamping plate 212, using the second slide bars 13 to support the bottom of the pouch battery 5; no further assembly operations are required.

[0032] Specifically, the clamping member 21 also includes support rings 216. Support rings 216 are provided on the side of the first clamping plate 211 opposite to the second clamping plate 212, and support rings 216 are also provided on the side of the second clamping plate 212 opposite to the first clamping plate 211. The number and position of the support rings 216 correspond to the first through hole 213. The first slide rod 12 passes through both the support rings 216 on the first clamping plate 211 and the second clamping plate 212. By providing support rings 216, the penetration depth of the first slide rod 12 in the clamping member 21 can be increased, making the sliding connection between the first slide rod 12 and the clamping member 21 more stable.

[0033] Specifically, refer to Figures 1 to 3As shown, there are multiple clamping members 21, which are arranged sequentially along the length of the first slide bar 12. By setting multiple clamping members 21, each clamping member 21 can test one pouch battery 5, that is, multiple pouch batteries 5 can be tested simultaneously to improve testing efficiency. The drive assembly 3 includes a screw 31, an operating handle 32, a push head 33, and a push base 34. The screw 31 passes through one of the end plates 11 and also passes through the reinforcing sleeve 15 on the end plate 11. The screw 31 is threadedly connected to the end plate 11 and the reinforcing sleeve 15. The push head 33 is located at the end of the screw 31 facing the clamping member 21, and the operating handle 32 is located at the end of the screw 31 away from the push head 33. The operating handle 32 can drive the screw 31 to rotate. The push head 33 is provided with a protrusion with a smooth curved surface, and the protrusion is located at the end of the push head 33 away from the screw 31. The propulsion base 34 is disposed on the clamping member 21 near the screw 31. Multiple clamping members 21 are arranged sequentially along the length of the frame assembly 1 between the two end plates 11, with the clamping member 21 located near the screw 31 for direct connection to the drive assembly 3. The propulsion base 34 has a groove 341 that engages with a protrusion on the propulsion head 33. The protrusion engages with the groove 341, allowing for an engagement between the propulsion head 33 and the propulsion base 34. When the screw 31 rotates, the protrusion of the propulsion head 33 rotates within the groove 341, simultaneously pushing the clamping member 21 located at the end towards the direction away from the drive assembly 3. Under the driving action of the drive assembly 3, all clamping members 21 move towards the direction away from the drive assembly 3, clamping the corresponding pouch battery 5.

[0034] Specifically, refer to Figure 1 and Figure 6 As shown, an isolation block 4 is provided between two adjacent clamping members 21. Under the action of the isolation block 4, a heat dissipation gap is formed between the two adjacent clamping members 21. During the test, the soft-pack battery 5 generates high temperature after being powered on. The heat dissipation gap accelerates airflow around the soft-pack battery 5, which is beneficial for heat dissipation. The isolation block 4 is located in the middle of the second clamping plate 212, and is located on the side of the second clamping plate 212 away from the first clamping plate 211. Of course, in other embodiments, the isolation block 4 can also be located in the middle of the first clamping plate 211, and is located on the side of the first clamping plate 211 away from the second clamping plate 212. Correspondingly, the screw 31 is located in the middle of the end plate 11, the push base 34 is located in the middle of the corresponding clamping member 21, and the isolation block 4 is coaxial with the screw 31.

[0035] Since the pressure applied by the drive assembly 3 to the clamping member 21 can be directly applied to the isolation block 4, the clamping member 21 and the isolation block 4 are pressed together in sequence without any gap in between, which can prevent the first clamping plate 211 or the second clamping plate 212 from being bent due to the pressure direction being misaligned with the isolation block 4.

[0036] In this embodiment, the specific method of using the test fixture for the soft-pack battery is as follows:

[0037] Step S01: Rotate screw 31 in the reverse direction to disengage the push head 33 from the push base 34.

[0038] Step S02: Open a certain gap between the first clamping plate 211 and the second clamping plate 212 in the clamping member 21, and then place the soft-pack battery 5 between the first clamping plate 211 and the second clamping plate 212. The bottom of the soft-pack battery 5 is placed on the second slide bar 13, and the electrode tab 51 is aligned with the current guiding terminal 217.

[0039] Step S03: Rotate screw 31 forward to connect the push head 33 to the push base 34. Screw 31 pushes all clamping members 21 to move in the direction away from screw 31, and makes all clamping members 21 press against the corresponding pouch battery 5.

[0040] Step S04: While maintaining the squeezed state of the pouch battery 5, obtain the electrical performance data of the pouch battery 5 through the test harness.

[0041] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A test fixture for a pouch battery, characterized in that, The device includes a frame assembly, a testing assembly, and a driving assembly. The frame assembly includes a first slide bar and a second slide bar arranged in parallel. The testing assembly includes a clamping member and a test wiring harness disposed on the clamping member. The clamping member includes two overlapping first clamping plates and a second clamping plate, both of which are slidably connected to the first slide bar. A pouch battery is clamped between the first clamping plate and the second clamping plate and electrically connected to the test wiring harness. The second slide bar abuts against the bottom of the pouch battery to support it. The driving assembly is disposed on the frame assembly and is used to drive the first clamping plate and the second clamping plate to compress the pouch battery.

2. The test fixture for a soft-pack battery according to claim 1, characterized in that, The first slide rod is inserted at least at the four corners of the first clamping plate and the second clamping plate.

3. The test fixture for a soft-pack battery according to claim 2, characterized in that, Both the side of the first clamping plate opposite to the second clamping plate and the side of the second clamping plate opposite to the first clamping plate are provided with protruding support rings, and the first sliding rod passes through the support rings.

4. The test jig of the pouch battery according to claim 1, characterized by, There are multiple second slide rods, which are distributed at intervals along the length of the soft-pack battery, and the second slide rods pass through the first clamping plate and the second clamping plate.

5. The test jig of the pouch battery according to claim 1, characterized by, One of the first clamping plate and the second clamping plate is provided with a current-conducting terminal, which is connected to the test wiring harness. The other of the first clamping plate and the second clamping plate is provided with an elastic pressure block, which faces the current-conducting terminal and is used to press the tab of the soft-pack battery onto the current-conducting terminal.

6. The test jig for a pouch battery according to any one of claims 1 to 5, characterized by, The frame assembly further includes a support member and end plates disposed at both ends of the support member. The ends of the first slide rod and the second slide rod are respectively connected to the two end plates. The support member is provided with a cable management buckle for fixing the test cable harness.

7. The test jig of the pouch battery according to claim 6, characterized by, The clamping components are multiple, and the multiple clamping components are arranged sequentially along the length direction of the first slide bar. An isolation block is provided between two adjacent clamping components, and the two adjacent clamping components are spaced apart to form a heat dissipation gap.

8. The test jig of the pouch battery according to claim 7, characterized by, The drive assembly includes a screw, a push head, and a push base. The screw is threadedly connected to one of the end plates. The push head is located at the end of the screw facing the clamping member. The push base is located on the clamping member near the screw. The push head and the push base are interlocked.

9. The test fixture for a soft-pack battery according to claim 8, characterized in that, The isolation block is coaxial with the screw.

10. The test fixture for a soft-pack battery according to claim 8, characterized in that, An operating handle is provided at the end of the screw that is away from the push head.

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