Quick detachable lithium ion battery test fixture

Abstract

The utility model provides a kind of lithium ion battery test fixture of quick assembly and disassembly, it is related to lithium ion battery test technical field, and it includes: upper clamping plate, the bottom of upper clamping plate is fixed with several guide posts along vertical direction;Lower clamping plate, it is slidably connected with guide post and is arranged in the lower of upper clamping plate in parallel;Push-pull type quick fixture, including fixed base and clamping jaw, fixed base is fixed on upper clamping plate and clamping jaw is set down and protrudes downwards;Compression spring, it is set on clamping jaw and is located below lower clamping plate.The beneficial effect is through the cooperation of push-pull type quick fixture and compression spring, just simple push-pull action can complete the clamping fixation or loosening release of battery, greatly save test time;The clamping force value provided by compression spring is relatively constant, can ensure that battery receives uniform surface pressure, more truly simulates its constraint state in module, effectively prevents abnormal expansion of battery cell in test process, improves test result reliability.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion battery testing technology, and in particular to a lithium-ion battery testing fixture that can be quickly loaded and unloaded. Background Technology

[0002] In the entire process of lithium-ion battery research and development and quality testing, comprehensive and accurate electrical performance testing of individual cells is a core step in ensuring battery safety, reliability, and performance consistency. Among these, charge-discharge cycle testing assesses the capacity decay of the battery under different charge-discharge cycles, thus determining the battery's cycle life; rate testing examines the battery's performance at different charge-discharge rates, understanding characteristics such as heat generation and voltage changes during high-current charge-discharge; capacity testing accurately measures the amount of charge the battery can store, a key indicator of battery energy; and internal resistance testing reflects the resistance characteristics of internal components such as electrode materials, electrolyte, and separator, directly affecting the battery's charge-discharge efficiency and power output. These electrical performance tests are interconnected and complementary, collectively providing crucial evidence for comprehensively evaluating the performance of lithium-ion batteries.

[0003] During the aforementioned electrical performance tests, it is essential to securely fix the individual battery cells to obtain accurate and reliable test data. This is because the battery cells undergo expansion and contraction to a certain extent during testing, especially during charging and discharging. If the battery cells are not securely fixed, their position and orientation may change, which not only affects the measurement accuracy of the testing equipment and leads to deviations in the test data, but may also subject the battery to additional mechanical stress during testing, potentially causing safety hazards. Therefore, clamps are typically used to constrain the battery cells, realistically simulating the surface constraint state of the battery within the module. In actual battery modules, the batteries are tightly arranged and constrained by the surrounding structure. This surface constraint state effectively limits abnormal cell expansion, ensuring the safe and stable operation of the battery module. By simulating this constraint state during testing, the performance of the battery under actual usage conditions can be more accurately reflected, improving the reliability and practicality of the test results.

[0004] However, most of the clamps currently used for battery testing employ a screw-fastening structure. While this structure can secure the battery to some extent, it has several significant drawbacks:

[0005] 1. Cumbersome operation and low efficiency: Screw-fastening fixtures require tools to tighten and loosen multiple screws one by one. The operation is cumbersome and complicated, greatly extending the preparation time and disassembly time after the test. This is especially true for large-scale testing or frequent battery replacements, reducing overall testing efficiency. Moreover, screws are prone to wear and stripping during frequent tightening and loosening, affecting the service life and fixing effect of the fixture.

[0006] 2. Difficulty in simulating real constraint conditions: The clamping force of screw fastening is not easy to control precisely and may be unevenly distributed, making it difficult to realistically simulate the surface constraint state of the battery in the battery module or pack, which will affect the accuracy of test results (such as expansion behavior).

[0007] 3. Risk of being too tight or too loose: When manually operating the screws, the force is not easy to control, which may cause the battery to be clamped too tightly and damaged, or too loosely and poor contact.

[0008] Given the problems existing in current screw-fastening fixtures, there is an urgent need to develop a new type of battery testing fixture that is easy to operate and can effectively simulate the constraint state of the module. Utility Model Content

[0009] To address the problems existing in the prior art, this utility model provides a lithium-ion battery test fixture that can be quickly loaded and unloaded, comprising:

[0010] The upper clamping plate has several guide posts fixed at its bottom along the vertical direction;

[0011] The lower clamping plate is arranged parallel to the lower part of the upper clamping plate and is slidably connected to the guide post;

[0012] A push-pull quick clamp includes a fixed base and a gripper, wherein the fixed base is fixed to the upper clamping plate and the gripper extends downward through the lower clamping plate;

[0013] A compression spring is sleeved on the gripper and located below the lower clamping plate.

[0014] Preferably, the end of the gripper opposite to the lower clamping plate is provided with a mounting groove, and the mounting groove is threadedly connected to a bolt.

[0015] Preferably, it also includes a washer, which is fitted onto the bolt and abuts against the compression spring.

[0016] Preferably, the bottom surface of the upper clamping plate and the top surface of the lower clamping plate are both provided with an insulating layer.

[0017] Preferably, it also includes a displacement sensor, which is embedded in a reserved hole in the upper clamping plate, and the probe of the displacement sensor extends through the upper clamping plate toward the lower clamping plate.

[0018] Preferably, the reserved hole is opened at one edge of the upper clamping plate.

[0019] Preferably, there are two push-pull quick clamps, which are symmetrically installed on both sides of the upper clamping plate.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] 1) Fast loading and unloading speed and convenient operation: With the cooperation of push-pull quick clamp and compression spring, the battery can be clamped and fixed or released with just a simple push-pull action. Compared with the traditional screw fastening method, the efficiency is increased several times, and the fixing and release can be completed in a few seconds, which greatly saves the testing time.

[0022] 2) Controllable and uniform clamping force: The clamping force provided by the compression spring can be adjusted by rotating the bolt according to the thickness of the battery, and the force value is relatively constant. This ensures that the battery is subjected to uniform surface pressure, more realistically simulating its constraint state in the module, effectively preventing abnormal expansion of the cell during the test, and improving the reliability of the test results.

[0023] 3) Compact structure and high integration: The push-pull quick clamp and compression spring are integrated into the clamp body, with reasonable structural design and complete functions. Attached Figure Description

[0024] Figure 1 A schematic diagram of the overall structure of a lithium-ion battery test fixture that can be quickly loaded and unloaded is shown in a preferred embodiment of this utility model.

[0025] Figure 2 In a preferred embodiment of this utility model, a side view of a lithium-ion battery test fixture on which the battery to be tested is mounted.

[0026] Figure 3 A schematic diagram of the structure of the push-pull quick clamp is shown in a preferred embodiment of this utility model.

[0027] In the attached image:

[0028] 1. Upper clamping plate; 2. Guide post; 3. Lower clamping plate; 4. Push-pull quick clamp; 41. Fixed base; 42. Gripper; 43. Operating handle; 5. Compression spring; 6. Bolt; 7. Washer; 8. Displacement sensor; 9. Probe; 10. Battery to be tested. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment; other embodiments that conform to the spirit of the present invention may also fall within its scope.

[0030] In a preferred embodiment of this utility model, based on the above-mentioned problems existing in the prior art, a lithium-ion battery test fixture that can be quickly loaded and unloaded is provided, such as... Figures 1 to 3 As shown, it includes:

[0031] Upper clamping plate 1, with several guide posts 2 fixed vertically at the bottom of upper clamping plate 1;

[0032] The lower clamping plate 3 is arranged parallel to the lower part of the upper clamping plate 1 and is slidably connected to the guide post 2;

[0033] The push-pull quick clamp 4 includes a fixed base 41 and a clamping jaw 42. The fixed base 41 is fixed on the upper clamping plate 1 and the clamping jaw 42 extends downward through the lower clamping plate 3.

[0034] Compression spring 5 is sleeved on gripper 42 and located below lower clamping plate 3.

[0035] Specifically, in this embodiment, one end of the compression spring 5 abuts against the end of the gripper 42 opposite to the lower clamping plate 3, and the other end abuts against the bottom of the lower clamping plate 3. The usage procedure of this utility model's quick-loading and detachable lithium-ion battery testing fixture is as follows:

[0036] The push-pull quick clamp 4 is equipped with an operating handle 43. When battery testing is required, the operator only needs to pull the operating handle 43 to the release position. Before pulling the operating handle 43, the compression spring 5 is in a certain compressed state, storing elastic potential energy. When the operating handle 43 is pulled to the release position, the constraint on the compression spring 5 is released, and it begins to release its stored compression force, or its compression force decreases significantly. This change will cause the lower clamp 3 connected to the compression spring 5 to move downward along the guide post 2. The guide post 2 plays a role in precise guidance and stable support, ensuring that the lower clamp 3 can move downward smoothly and linearly without deviation or wobbling. As the lower clamp 3 moves downward, the distance between the upper clamp 1 and the lower clamp 3 gradually increases, eventually creating a sufficient gap between the upper and lower clamps. This ensures that the operator can easily and smoothly place the battery to be tested 10 into the designated position between the upper clamp 1 and the lower clamp 3, without difficulty in placement or damage to the battery due to insufficient gap.

[0037] After the battery under test 10 is accurately placed between the upper and lower clamping plates, it is then securely fixed to ensure that the battery will not move or shake during subsequent testing, thereby guaranteeing the accuracy and reliability of the test data. At this time, the operator operates the operating handle 43 again, pulling it towards the clamping position. When the operating handle 43 is pulled to the clamping position, the mechanical transmission system inside the clamp activates, causing the compression spring 5 to be further compressed, increasing its stored elastic potential energy. To return to its original shape, the compression spring 5 generates a strong elastic restoring force. This elastic restoring force is transmitted to the lower clamping plate 3, driving the lower clamping plate 3 to move upward along the guide post 2. As the lower clamping plate 3 moves upward, it gradually approaches the upper clamping plate 1, applying uniform pressure to the battery under test 10 placed between them. This uniform pressure distribution ensures that all parts of the battery are constrained to the same degree, avoiding damage caused by excessive local stress due to uneven pressure. Finally, the lower clamping plate 3 firmly and evenly presses and fixes the test battery 10 between the upper clamping plate 1 and the lower clamping plate 3, making full preparations for subsequent electrical performance testing.

[0038] After the battery under test 10 is securely clamped, the operator can connect the testing equipment and perform charge-discharge and other electrical performance tests on the battery under test 10. During the test, because the battery is reliably fixed in the fixture, it will not be affected by external factors, thus ensuring the accuracy and stability of the test data and providing a reliable basis for battery performance evaluation.

[0039] After the test is completed, the battery 10 to be tested needs to be removed from the fixture. At this time, the operator only needs to pull the operating handle 43 to the release position again, the same operation as when inserting the battery. When the operating handle 43 is pulled to the release position, the compression spring 5 releases its compression force or the compression force decreases, causing the lower clamping plate 3 to move down along the guide post 2, thereby creating a sufficient gap between the upper clamping plate 1 and the lower clamping plate 3. The operator can then easily remove the battery 10 to be tested from the fixture, completing the entire testing process.

[0040] It is understandable that the aforementioned push-pull quick clamp 4 is a standard component, and its internal mechanical connections will not be described in detail here.

[0041] In a preferred embodiment of the present invention, a mounting groove is provided at one end of the gripper 42 away from the lower clamping plate 3, and the mounting groove is threadedly connected to the bolt 6.

[0042] Specifically, when testing lithium-ion batteries, the thickness of the batteries 10 under test varies depending on their specifications and models, requiring the test fixture to have a certain degree of adaptability. In this embodiment, by providing threaded bolts 6 at the ends of the grippers 42, the operator can flexibly adjust the screw-in depth of the bolts 6 according to the specific thickness of the battery 10 under test during the actual testing process. This greatly improves the versatility and flexibility of the test fixture, eliminating the need to design multiple specifications of fixtures specifically for batteries of different thicknesses, thus reducing production costs and equipment inventory pressure.

[0043] In a preferred embodiment of the present invention, a gasket 7 is further included, which is sleeved on the bolt 6 and abuts against the compression spring 5.

[0044] Specifically, in this embodiment, by providing a shim 7, the compression spring 5 can be prevented from coming out.

[0045] In a preferred embodiment of this utility model, an insulating layer is provided on the bottom surface of the upper clamping plate 1 and the top surface of the lower clamping plate 3.

[0046] Specifically, in this embodiment, the insulating layer can be an insulating board or related insulating film such as an epoxy board, silicone board, PET board, PTFE board, or polyimide board, which is not shown in the figure.

[0047] When using an insulating board, it is preferable to fix it to the bottom surface of the upper clamping plate 1 and the top surface of the lower clamping plate 3 by bonding or embedding. For bonding, a suitable adhesive must be selected to ensure good high and low temperature resistance and bonding strength, enabling the insulating board to be firmly adhered to the clamping plate without detachment or loosening during long-term use. The embedding process involves machining grooves on the clamping plate that match the shape and size of the insulating board, embedding the insulating board into the grooves for precise positioning and fixation.

[0048] When using insulating film as the insulating layer, adhesive-backed polyimide film is preferred and adhered to the splice surface. Ordinary insulating film can also be used, bonded to the splice surface using hot or cold pressing. Hot pressing utilizes heat and pressure to fully fuse the insulating film with the splice surface, forming a tight bond. During hot pressing, parameters such as temperature, pressure, and time must be strictly controlled to ensure the insulating performance of the film is not affected and that it adheres firmly to the splice surface. Cold pressing, on the other hand, applies pressure to press the insulating film tightly onto the splice surface and is suitable for some temperature-sensitive insulating film materials.

[0049] Furthermore, the insulating layer acts as a buffer and protector, reducing damage to the battery surface caused by friction and collisions during battery installation, removal, and testing, and preventing electrolyte leakage due to battery casing damage. Simultaneously, the insulating layer also protects the clamp itself, preventing metallic impurities or other conductive substances from the battery surface from adhering to the clamp and affecting its insulation performance and lifespan.

[0050] In a preferred embodiment of the present invention, a displacement sensor 8 is further included, which is embedded in a reserved hole in the upper clamping plate 1, and the probe 9 of the displacement sensor 8 extends through the upper clamping plate 1 toward the lower clamping plate 3.

[0051] Specifically, in this embodiment, by setting a displacement sensor 8, during the electrical performance testing of the battery 10 under test, the displacement sensor 8 can measure the change in the distance between the upper clamping plate 1 and the lower clamping plate 3 in real time and with high precision, that is, the change in the thickness (expansion rate) of the battery 10 under test, and send the data to an external data acquisition system. This provides key data for analyzing battery performance (such as capacity decay, SEI film growth, lithium plating tendency, and mechanical integrity), which is of great significance for battery research and development and quality control.

[0052] Furthermore, the reserved hole is opened on one side edge of the upper clamping plate 1, which can monitor the thickness of the battery under test 10 in real time without interfering with the installation process of the battery under test 10.

[0053] In a preferred embodiment of this utility model, there are two push-pull quick clamps 4, which are symmetrically installed on both sides of the upper clamping plate 1.

[0054] Specifically, in this embodiment, by symmetrically arranging two push-pull quick clamps 4, a more uniform clamping force can be generated, making the mechanical environment experienced by the battery under test during the test highly similar to the environment during actual use. This provides a condition for testing that is closer to the real situation, and the expansion data obtained can more accurately reflect the expansion of the battery in actual use, providing a reliable basis for battery performance evaluation and safety analysis.

[0055] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included within the protection scope of the present utility model.

Claims

1. A quick-loading and detachable lithium-ion battery test fixture, characterized in that, include: The upper clamping plate has several guide posts fixed at its bottom along the vertical direction; The lower clamping plate is arranged parallel to the lower part of the upper clamping plate and is slidably connected to the guide post; A push-pull quick clamp includes a fixed base and a gripper, wherein the fixed base is fixed to the upper clamping plate and the gripper extends downward through the lower clamping plate; A compression spring is sleeved on the gripper and located below the lower clamping plate.

2. The lithium-ion battery testing fixture according to claim 1, characterized in that, The end of the gripper opposite to the lower clamping plate has an installation groove, which is threadedly connected to a bolt.

3. The lithium-ion battery testing fixture according to claim 2, characterized in that, It also includes a gasket, which is fitted onto the bolt and abuts against the compression spring.

4. The lithium-ion battery testing fixture according to claim 1, characterized in that, The bottom surface of the upper clamping plate and the top surface of the lower clamping plate are both provided with an insulating layer.

5. The lithium-ion battery testing fixture according to claim 1, characterized in that, It also includes a displacement sensor, which is embedded in a reserved hole in the upper clamping plate, and the probe of the displacement sensor extends through the upper clamping plate toward the lower clamping plate.

6. The lithium-ion battery testing fixture according to claim 5, characterized in that, The reserved hole is opened at one edge of the upper clamping plate.

7. The lithium-ion battery testing fixture according to claim 1, characterized in that, Two push-pull quick clamps are provided, which are symmetrically installed on both sides of the upper clamping plate.

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