A battery cell testing device

Abstract

This utility model discloses a battery cell testing device for testing the electrical performance of a battery cell under test. The device includes: a battery cell testing mechanism comprising: a constant temperature chamber having a top wall and a bottom wall arranged opposite each other along a first direction, with a work station groove formed on the bottom wall; a clamping mechanism including an upper clamp and a lower clamp, the lower clamp being placed in the work station groove and fixedly connected to it, the upper and lower clamps holding the battery cell under test; and a connecting rod located inside the constant temperature chamber, extending along the first direction, one end of the connecting rod being fixedly connected to the upper clamp, and the other end being fixedly connected to the top wall. The connecting rod is telescopic to adjust the distance between the upper and lower clamps. By adopting the above technical solution, the assembly process of the clamp, battery cell, and battery cell testing device is simplified, thereby optimizing the battery cell electrical performance testing process and improving testing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of battery cell testing, and specifically to a battery cell testing device. Background Technology

[0002] In the current era of rapid development in the new energy industry, battery cells, as the fundamental unit of core components such as power batteries and energy storage batteries, directly determine the safety performance, range, and lifespan of end products through their electrical performance (such as capacity, charge / discharge efficiency, cycle life, and internal resistance). Therefore, electrical performance testing always occupies a core position in the production, manufacturing, and technological research and development of battery cells. Testing the electrical performance of battery cells is a crucial step in their production and development, directly impacting quality assessment and performance optimization.

[0003] In existing technologies, battery cell testing devices are used to test the electrical performance of battery cells. These devices include a temperature control unit, an electrical performance testing unit, and a cell support unit. To prevent cell expansion during charging and discharging, which could cause changes to the internal structure of the cell, additional clamps are typically used to hold the cell in place before testing. Assembling the clamps and cells requires connecting them with bolts and nuts, followed by a complex installation process to secure the clamps to the testing device. This traditional method necessitates tedious installation for each test, which is not only time-consuming and labor-intensive but also increases the complexity and uncertainty of the testing process.

[0004] Existing battery cell testing devices suffer from cumbersome installation procedures and operational complexity. Therefore, simplifying the assembly process of fixtures, battery cells, and battery cell testing devices, thereby optimizing the battery cell electrical performance testing process and improving testing efficiency, has become an urgent technical problem to be solved. Utility Model Content

[0005] The purpose of this invention is to solve the problem of how to achieve a fixed connection between the clamp and the battery cell without additional bolts and nuts, simplify the assembly process of the clamp, battery cell and battery cell testing device, thereby optimizing the battery cell electrical performance testing process and improving testing efficiency.

[0006] In a first aspect, this utility model provides a battery cell testing device for testing the electrical performance of a battery cell under test, comprising: a battery cell testing mechanism, including: a constant temperature chamber having a top wall and a bottom wall arranged opposite to each other along a first direction, with a work station groove formed on the bottom wall; a clamping mechanism including an upper clamp and a lower clamp, the lower clamp being placed in the work station groove and fixedly connected to the work station groove, the upper clamp and the lower clamp clamping the battery cell under test; and a connecting rod located in the constant temperature chamber, extending along the first direction, one end of the connecting rod being fixedly connected to the upper clamp, and the other end of the connecting rod being fixedly connected to the top wall, the connecting rod being a telescopic structure to adjust the distance between the upper clamp and the lower clamp.

[0007] By adopting the above technical solution, the lower clamp is pre-fixed to the workstation slot, and the upper clamp is integrated with the connecting rod, thus connecting the clamping mechanism and the cell testing device. This eliminates the need to use bolts to connect the clamping mechanism and the cell testing device for each test. The connecting rod is telescopic, allowing adjustment of the distance between the upper and lower clamps. This eliminates the need for additional bolts and nuts to achieve a fixed connection between the clamping mechanism and the cell, simplifying the assembly process of the clamping mechanism, cell, and cell testing device. This optimizes the cell electrical performance testing process and improves testing efficiency.

[0008] According to another specific embodiment of the present invention, multiple sets of workstation slots, clamping mechanisms and connecting rods are provided. The multiple sets of workstation slots are arranged along the second direction, and each set of workstation slots corresponds to a set of clamping mechanisms and a set of connecting rods. Each set of connecting rods consists of 2 to 4 rods, and the second direction is parallel to the bottom wall.

[0009] According to another specific embodiment of the present invention, the cell testing mechanism further includes: a working chamber located at the bottom of the constant temperature chamber, a work station located in the working chamber, the working chamber having side walls arranged opposite each other along a third direction, the third direction being perpendicular to the first direction and the second direction, and a positive electrode connection hole and a negative electrode connection hole being provided on the side wall of the working chamber, the positive electrode connection hole and the negative electrode connection hole communicating with the interior of the work station.

[0010] According to another specific embodiment of the present invention, the constant temperature chamber has side walls arranged opposite each other along a third direction. The side walls of the constant temperature chamber are provided with observation windows. The observation windows are made of high-temperature resistant transparent glass, and the position of the observation windows corresponds to the position of the workstation slots.

[0011] According to another specific embodiment of the present invention, a heat insulation partition is provided between two adjacent sets of workstation slots. The height of the heat insulation partition in the first direction is not lower than the height of the battery cell to be tested in the first direction. The heat insulation partition is detachably connected to the bottom wall.

[0012] According to another specific embodiment of the present invention, the lower clamp is detachably connected to the work station slot, and the upper clamp is detachably connected to the connecting rod.

[0013] According to another specific embodiment of the present invention, the lower clamp is connected to the work station slot by a snap fastener or magnetic attraction, and the upper clamp is connected to the connecting rod by a snap fastener or magnetic attraction.

[0014] According to another specific embodiment of the present invention, there are 2 to 3 battery cell testing mechanisms, and the 2 to 3 battery cell testing mechanisms are stacked along the first direction.

[0015] According to another specific embodiment of this utility model, the side of the upper clamp facing the battery cell to be tested is provided with an elastic buffer layer. The elastic buffer layer is made of silicone or polyurethane and has a thickness of 1~3mm.

[0016] According to another specific embodiment of the present invention, the connecting rod includes an outer rod and an inner rod. The inner rod is fixedly connected to the top wall, and the outer rod is sleeved outside the inner rod and can slide along the first direction. The end of the outer rod away from the top wall is fixedly connected to the upper clamp. The side wall of the outer rod is provided with a locking knob. When the locking knob is tightened, the inner rod and the outer rod can be fixed relative to each other. Attached Figure Description

[0017] Figure 1 This diagram shows a structural schematic of a cell testing device according to an embodiment of the present invention.

[0018] Figure 2 This diagram shows a cross-sectional view of a cell testing device according to an embodiment of the present invention.

[0019] Figure 3 This diagram shows a structural schematic of a cell testing device according to another embodiment of the present invention;

[0020] Figure 4 This diagram shows a cross-sectional view of the cell testing device in another embodiment of the present invention.

[0021] Symbol Explanation: 100-Cell testing device, 110-Cell testing mechanism, 111-Constant temperature chamber, 1111-Top wall, 1112-Bottom wall, 1113-Working slot, 1114-Side wall of constant temperature chamber, 112-Clamping mechanism, 1121-Upper clamp, 1122-Lower clamp, 113-Connecting rod, 1131-Outer rod, 1132-Inner rod, 1133-Locking knob, 114-Working chamber, 1141-Side wall of working chamber, 1142-Positive terminal hole, 1143-Negative terminal hole, 200-Cell under test. Detailed Implementation

[0022] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0023] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Firstly, reference Figure 1 and Figure 2 This utility model provides a battery cell testing device 100 for testing the electrical performance of a battery cell 200 under test. The battery cell testing device 100 includes a battery cell testing mechanism 110. The battery cell testing mechanism 110 includes a constant temperature chamber 111, having a top wall 1111 and a bottom wall 1112 disposed opposite to each other along a first direction, with a work station groove 1113 formed on the bottom wall 1112. The first direction is, for example... Figure 1 , Figure 2 and Figure 3 The clamping mechanism 112 includes an upper clamp 1121 and a lower clamp 1122. The lower clamp 1122 is placed in the workstation slot 1113 and is fixedly connected to the workstation slot 1113. The upper clamp 1121 and the lower clamp 1122 clamp the battery cell 200 to be tested. The connecting rod 113 is located inside the constant temperature chamber 111 and runs along the first direction (e.g., Z direction). Figure 1 , Figure 2 and Figure 3 Extending in the Z direction, one end of the connecting rod 113 is fixedly connected to the upper clamp 1121, and the other end of the connecting rod 113 is fixedly connected to the top wall 1111. The connecting rod 113 is a telescopic structure to adjust the distance between the upper clamp 1121 and the lower clamp 1122.

[0026] By adopting the above technical solution, the lower clamp 1122 is pre-fixed to the workstation slot 1113, and the upper clamp 1121 is integrated with the connecting rod 113, thus realizing the connection between the clamping mechanism 112 and the cell testing device 100. This eliminates the step of connecting the clamping mechanism 112 and the cell testing device 100 with bolts for each test. The connecting rod 113 is a telescopic structure, allowing adjustment of the distance between the upper clamp 1121 and the lower clamp 1122. This eliminates the need for additional bolts and nuts to achieve a fixed connection between the clamping mechanism 112 and the cell under test 200, simplifying the assembly process of the clamping mechanism 112, the cell under test 200, and the cell testing device 100. This optimizes the electrical performance testing process of the cell under test 200 and improves testing efficiency.

[0027] Specifically, the lower clamp 1122 is pre-fixed to the workstation slot 1113, and the upper clamp 1121 is integrated with the connecting rod 113. The clamping mechanism 112, which connects directly to the cell testing device 100, is designed inside the cell testing device 100. Unlike existing technologies, it eliminates the need to use bolts to connect the clamping mechanism 112 and the cell testing device 100 for each test, simplifying the connection process between the clamping mechanism and the cell testing device. The connecting rod 113 is designed as a telescopic structure and extends along a first direction, with one end connected to the upper clamp 1121 and the other end fixed to the top wall 1111 of the constant temperature chamber 111. The telescopic nature of the connecting rod 113 allows adjustment of the distance between the upper clamp 1121 and the lower clamp 1122, enabling a fixed connection between the clamping mechanism 112 and the cell under test 200 without the need for additional fasteners, thus simplifying the assembly process. Because the above design simplifies the assembly processes of the clamping mechanism 112 with the cell testing device 100 and the clamping mechanism 112 with the cell under test 200, the entire electrical performance testing process for the cell under test 200 becomes more convenient. The above technical solution reduces the number of steps and time required during assembly, thereby optimizing the entire testing process and ultimately improving testing efficiency.

[0028] In the above embodiment, the battery cell 200 under test is a pouch cell. The difference between a pouch cell and cylindrical or prismatic rigid-shell cells is that the pouch cell's outer shell lacks rigid support. During charging and discharging, reactions such as lithium-ion insertion / extraction, electrolyte decomposition, and micro-expansion of the electrode volume occur inside the pouch cell. Without external constraint, the aluminum-plastic film outer shell will bulge, warp, or locally protrude due to these internal changes. If the pouch cell has internal short circuits or other defects, it will bulge rapidly during charging and discharging. Without the constraint of the clamping mechanism 112, the aluminum-plastic film may rupture directly, leading to electrolyte leakage. The rigid clamping of the clamping mechanism 112 provides external constraint force, delaying or preventing excessive bulging of the cell.

[0029] In some embodiments, continue to refer to Figure 1 and Figure 2 The workstation slots 1113, the clamping mechanism 112, and the connecting rod 113 are each provided in multiple sets. These multiple sets of workstation slots 1113 are arranged along a second direction. For example, the second direction... Figure 1 The X direction in the middle. Each set of workstation slots 1113 corresponds to a set of clamping mechanisms 112 and a set of connecting rods 113; each set of connecting rods 113 consists of 2 to 4 rods, and the second direction is parallel to the bottom wall 1112.

[0030] In the above embodiments, the plurality of connecting rods 113 are along a first direction (e.g., Figure 1 and Figure 2The clamping mechanism 112 extends in the Z direction, with multiple connecting rods 113 having one end fixed to the upper clamp 1121 and the other end fixed to the top wall 1111 of the constant temperature chamber 111, forming a multi-point distributed support structure. This structure can evenly distribute the weight of the upper clamp 1121 and the pressure of the battery cell 200 under test to each connecting rod 113, avoiding the problem of single-point overload or uneven force distribution, and structurally ensuring the overall stability of the clamping mechanism 112.

[0031] Furthermore, 2-4 connecting rods 113 are fixedly connected to the upper clamp 1121, forming a synchronous constraint on the clamping mechanism 112. When the connecting rods 113 extend and retract to adjust the distance between the upper clamp 1121 and the lower clamp 1122, the multiple connecting rods 113 can maintain synchronous extension and retraction, preventing the upper clamp 1121 from tilting or shifting during the adjustment process, thereby ensuring the stability of the upper clamp 1121. The stable state of the upper clamp 1121 is directly transmitted to the clamping action of the battery cell 200 under test, ensuring that the upper clamp 1121 and the lower clamp 1122 can always be directly facing the battery cell 200 under test and apply clamping force evenly, preventing the battery cell 200 under test from loosening or experiencing uneven force due to clamp offset, thereby stably clamping the battery cell under test.

[0032] In some embodiments, reference Figures 1-4 The cell testing mechanism 110 also includes: a working chamber 114, located at the bottom of the constant temperature chamber 111, and a work station slot 1113 located within the working chamber 114. The working chamber 114 has a three-way orientation (e.g., along a third direction). Figure 1 and Figure 2 The side wall 1141 of the working chamber is set opposite to the Y direction, and the third direction is perpendicular to the first and second directions. The side wall 1141 of the working chamber is provided with a positive terminal hole 1142 and a negative terminal hole 1143, which are connected to the inside of the workstation slot 1113.

[0033] In the above embodiments, the work station slot 1113 serves as the mounting carrier for the lower clamp 1122. The battery cell 200 under test is fixed within the work station slot 1113 by the clamping of the upper clamp 1121 and the lower clamp 1122. The work station slot 1113 is located within the working chamber 114. The side wall 1141 of the working chamber is provided with a positive terminal hole 1142 and a negative terminal hole 1143. The positive probe or wire of the testing equipment can extend directly to the positive terminal tab of the battery cell 200 under test within the work station slot 1113 through the positive terminal hole 1142, and the negative probe or wire can directly connect to the negative terminal tab of the battery cell 200 under test through the negative terminal hole 1143. This eliminates the need to bypass the top wall 1111 or bottom wall 1112 of the constant temperature chamber 111, significantly shortening the connection path of the test circuit. During testing, operators do not need to disassemble the top wall 1111 of the constant temperature chamber 111 or go deep into the constant temperature chamber 111. They can simply connect the circuit through the positive terminal 1142 and the negative terminal 1143 from the side wall 1141 of the working chamber 114, which is convenient for testing.

[0034] In some embodiments, the constant temperature chamber 111 has a third direction (e.g., Figure 1 and Figure 2 The side wall 1114 of the constant temperature chamber is set opposite to the Y direction of the chamber, and the side wall 1114 of the constant temperature chamber is provided with an observation window (not shown). The observation window is made of high temperature resistant transparent glass, and the position of the observation window corresponds to the position of the workstation slot 1113.

[0035] In the above embodiments, the observation window is made of high-temperature resistant transparent glass, which allows light to pass through directly, enabling the operator to clearly see the battery cell 200 under test inside the constant temperature chamber 111, avoiding visual obstruction caused by the enclosed space. During the electrical performance testing of the battery cell 200, the constant temperature chamber 111 needs to maintain a high temperature to simulate the actual working environment of the battery cell 200. The high-temperature resistant glass can withstand this ambient temperature without deformation, cracking, or decreased light transmittance, ensuring stable observation throughout the entire testing cycle. The workstation slot 1113 is the placement area for the battery cell 200 under test. The observation window corresponds to the workstation slot 1113, allowing the operator's line of sight to be directly focused on the location of the battery cell 200 under test, avoiding obstruction by other structures within the constant temperature chamber 111 (such as the connecting rod 113). This facilitates observation of the test status of the battery cell 200, such as whether the battery cell 200 is bulging, whether there are traces of electrolyte leakage, and whether the tabs are abnormal. The observation window allows for observation without opening the constant temperature chamber 111, avoiding interference with the constant temperature environment caused by frequent opening and closing, and saving operation time. This allows operators to quickly and easily monitor the status of the battery cell 200 under test.

[0036] In some embodiments, a heat insulation partition (not shown) is provided between two adjacent sets of workstation slots 1113, and the heat insulation partition is in a first direction (e.g. Figure 1 , Figure 2 and Figure 3 The height in the Z direction is not lower than the height of the cell under test 200 in the first direction, and the heat insulation partition is detachably connected to the bottom wall 1112.

[0037] In the above embodiments, heat insulation partitions are provided between two adjacent sets of workstation slots 1113. The heat insulation partitions are made of materials with low thermal conductivity. Examples of heat insulation partitions include ceramics and high-temperature resistant insulation cotton. The heat insulation partitions can directly block heat conduction between adjacent workstation slots 1113. When multiple test cells 200 are tested simultaneously in the constant temperature chamber 111, differences in heat generation may occur due to their own charging and discharging reactions (e.g., some test cells 200 generate more heat due to higher internal resistance). The heat insulation partitions, through physical isolation, can prevent the heat generated by one set of cells from being transferred to adjacent cells, avoiding mutual interference and superposition of heat between adjacent workstations, and ensuring that the thermal environment of each cell is relatively independent. The height of the test cell 200 in the first direction, i.e., its thickness dimension, is the main spatial range for heat dissipation from the cell. The height of the heat insulation partition in the first direction is not less than the height of the battery cell. The heat insulation partition provides lateral isolation for the battery cell 200 under test, preventing heat from spreading from the lateral space of the battery cell 200 under test to adjacent workstations.

[0038] In some embodiments, the lower clamp 1122 is detachably connected to the work station slot 1113, and the upper clamp 1121 is detachably connected to the connecting rod 113.

[0039] In the above embodiments, the lower clamp 1122 and the upper clamp 1121, as components that directly contact the battery cell, may experience wear and aging during long-term use, or be damaged due to abnormal swelling of the battery cell, requiring regular maintenance or replacement. The lower clamp 1122 is detachably connected to the workstation slot 1113, and the upper clamp 1121 is detachably connected to the connecting rod 113. Damaged upper clamp 1121 or lower clamp 1122 can be directly and individually disassembled without disassembling other core structures, such as the constant temperature chamber 111 and the connecting rod 113, significantly shortening maintenance time and reducing maintenance difficulty. Furthermore, only the damaged upper clamp 1121 or lower clamp 1122 needs to be replaced, without replacing the entire battery cell testing mechanism 110, reducing maintenance and repair costs.

[0040] In some embodiments, the lower clamp 1122 is connected to the work station slot 1113 by a snap or magnetic attraction, and the upper clamp 1121 is connected to the connecting rod 113 by a snap or magnetic attraction.

[0041] In some embodiments, the lower clamp 1122 is connected to the workstation slot 1113 by a snap-fit ​​connection, and the upper clamp 1121 is connected to the connecting rod 113 by a snap-fit ​​connection. For example, the lower clamp 1122 is provided with a first hook (not shown), and the workstation slot 1113 is provided with a first slot (not shown). The lower clamp 1122 and the workstation slot 1113 are fixedly connected by the snap-fit ​​of the first hook and the first slot. The upper clamp 1121 is provided with a second hook, and the connecting rod 113 is provided with a second slot. The upper clamp 1121 and the connecting rod 113 are fixedly connected by the snap-fit ​​of the second hook and the second slot. Alternatively, the lower clamp 1122 is provided with a first slot (not shown), and the work station slot 1113 is provided with a first hook (not shown). The lower clamp 1122 and the work station slot 1113 are fixedly connected by the first hook and the first slot. The upper clamp 1121 is provided with a second slot, and the connecting rod 113 is provided with a second hook. The upper clamp 1121 and the connecting rod 113 are fixedly connected by the second hook and the second slot. The snap-fit ​​connection can be installed or removed simply by pressing or moving the snap-fit, making installation and removal convenient.

[0042] In some embodiments, the lower clamp 1122 is magnetically connected to the workstation slot 1113, and the upper clamp 1121 is magnetically connected to the connecting rod 113. The lower clamp 1122 is provided with a first magnetic body (not shown), and the workstation slot 1113 is provided with a second magnetic body (not shown). The lower clamp 1122 and the workstation slot 1113 are fixedly connected by the attraction between the first and second magnetic bodies. The upper clamp 1121 is provided with a third magnetic body (not shown), and the connecting rod 113 is provided with a fourth magnetic body (not shown). The upper clamp 1121 and the connecting rod 113 are fixedly connected by the attraction between the third and fourth magnetic bodies. In this embodiment, the first, second, third, and fourth magnetic bodies are all strongly magnetic. The attraction force of the strong magnetic bodies ensures a tight fit between the adsorption surfaces, which can compensate for minor assembly errors in real time. Magnetic connection only requires alignment for fixation, making assembly quick and convenient.

[0043] In some embodiments, reference Figure 3 There are 2 to 3 cell testing mechanisms 110, and these 2 to 3 cell testing mechanisms 110 are stacked along a first direction. The first direction is, for example... Figure 1 , Figure 2 and Figure 3 The Z direction in the equation.

[0044] In the above embodiments, 2 to 3 cell testing mechanisms 110 are stacked along the first direction. The total height of the 2 to 3 layers of cell testing mechanisms 110 is usually controlled between 0.6 and 1.5 m, which is within the comfortable height range for testers to stand and operate. The cell to be tested 200 can be clamped directly by hand movements, such as placing the cell to be tested 200 into the work station slot 1113 and aligning the upper clamp 1121 and the lower clamp 1122. This avoids the need to use ladders, stools or other auxiliary tools due to the excessive height of the cell testing device 100, and greatly improves the convenience of cell placement.

[0045] In some embodiments, the upper clamp 1121 has an elastic buffer layer (not shown) on the side facing the battery cell 200 to be tested. The elastic buffer layer is made of silicone or polyurethane and has a thickness of 1 to 3 mm.

[0046] In some embodiments, the side of the lower clamp 1122 facing the battery cell 200 under test is provided with an elastic buffer layer (not shown), the elastic buffer layer is made of silicone or polyurethane, and the thickness is 1~3mm.

[0047] In the above embodiments, if the upper clamp 1121 and lower clamp 1122 are in direct rigid contact with the battery cell 200 under test, and there are small protrusions or burrs on the surface of the clamps, the rigid clamping will cause local stress concentration, which may puncture the aluminum-plastic film and cause electrolyte leakage. A 1-3mm thick silicone or polyurethane elastic buffer layer has good deformation capability and can disperse local stress through its own compression, converting the rigid force of the clamps into uniform flexible pressure, thus preventing the aluminum-plastic film from being punctured or the electrode from being damaged. Furthermore, the elastic buffer layer is made of silicone or polyurethane, which will not react with the casing of the battery cell under test or the electrolyte that may leak, ensuring test safety.

[0048] In some embodiments, reference Figure 4 The connecting rod 113 includes an outer rod 1131 and an inner rod 1132. The inner rod 1132 is fixedly connected to the top wall 1111. The outer rod 1131 is sleeved outside the inner rod 1132 and can move along a first direction (e.g., Figure 1 , Figure 2 , Figure 3 and Figure 4 The outer rod 1131 slides in the Z direction, and the end of the outer rod 1131 away from the top wall 1111 is fixedly connected to the upper clamp 1121; the side wall of the outer rod 1131 is provided with a locking knob 1133, and when the locking knob 1133 is tightened, the inner rod 1132 and the outer rod 1131 can be fixed relative to each other.

[0049] In the above embodiments, the outer rod 1131 is sleeved outside the inner rod 1132 and can move along the first direction (e.g. Figure 1 , Figure 2 , Figure 3 and Figure 4The inner rod 1132 slides in the Z direction to adjust the distance between the upper clamp 1121 and the lower clamp 1122, thereby clamping the battery cell 200 under test. During electrical performance testing of the battery cell, the operator can move the outer rod 1131 in the first direction, causing the upper clamp 1121 to rise and fall synchronously, allowing for intuitive and precise adjustment of the distance between the upper clamp 1121 and the lower clamp 1122. When the locking knob 1133 is tightened, the inner rod 1132 and the outer rod 1131 are relatively fixed. After locking, there is no relative sliding between the inner rod 1132 and the outer rod 1131, and the position of the upper clamp 1121 remains stable, ensuring that the clamping force continuously acts on the battery cell 200 under test. This avoids poor contact in the test circuit or damage to the battery cell due to displacement of the clamp mechanism 112, ensuring the accuracy of the test data.

[0050] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery cell testing device for testing the electrical performance of a battery cell under test, characterized in that, include: Battery cell testing institutions include: A constant temperature room has a top wall and a bottom wall arranged opposite to each other along a first direction, and a work station groove is provided on the bottom wall; The clamping mechanism includes an upper clamp and a lower clamp, the lower clamp being placed in the work station slot and fixedly connected to the work station slot, and the upper clamp and the lower clamp holding the battery cell to be tested; A connecting rod is located inside the constant temperature chamber and extends along the first direction. One end of the connecting rod is fixedly connected to the upper clamp, and the other end of the connecting rod is fixedly connected to the top wall. The connecting rod is a telescopic structure to adjust the distance between the upper clamp and the lower clamp.

2. The cell testing device as described in claim 1, characterized in that, The workstation slots, the clamping mechanism, and the connecting rods are provided in multiple sets. The multiple sets of workstation slots are arranged along the second direction. Each set of workstation slots corresponds to a set of clamping mechanisms and a set of connecting rods. Each set of connecting rods consists of 2 to 4 rods. The second direction is parallel to the bottom wall.

3. The cell testing device as described in claim 2, characterized in that, The cell testing mechanism also includes: The working chamber is located at the bottom of the constant temperature chamber, and the work station slot is located in the working chamber. The working chamber has side walls arranged opposite each other along a third direction, which is perpendicular to the first direction and the second direction. Positive and negative terminals are provided on the side walls of the working chamber, and the positive and negative terminals are in communication with the interior of the work station slot.

4. The cell testing device as described in claim 3, characterized in that, The constant temperature chamber has side walls arranged opposite each other along a third direction. The side walls of the constant temperature chamber are provided with observation windows. The observation windows are made of high-temperature resistant transparent glass, and the position of the observation windows corresponds to the position of the workstation slot.

5. The cell testing apparatus as described in claim 1, characterized in that, A heat insulation partition is provided between two adjacent sets of workstation slots. The height of the heat insulation partition in the first direction is not lower than the height of the battery cell under test in the first direction. The heat insulation partition is detachably connected to the bottom wall.

6. The cell testing apparatus as described in claim 1, characterized in that, The lower clamp is detachably connected to the work station slot, and the upper clamp is detachably connected to the connecting rod.

7. The cell testing apparatus as described in claim 6, characterized in that, The lower clamp is connected to the work station slot by a snap fastener or magnetic attraction, and the upper clamp is connected to the connecting rod by a snap fastener or magnetic attraction.

8. The cell testing apparatus as described in claim 1, characterized in that, There are 2 to 3 cell testing mechanisms, and the 2 to 3 cell testing mechanisms are stacked along the first direction.

9. The cell testing apparatus as described in claim 1, characterized in that, The upper clamp has an elastic buffer layer on the side facing the battery cell to be tested. The elastic buffer layer is made of silicone or polyurethane and has a thickness of 1~3mm.

10. The cell testing apparatus as described in claim 1, characterized in that, The connecting rod includes an outer rod and an inner rod. The inner rod is fixedly connected to the top wall. The outer rod is sleeved outside the inner rod and can slide along a first direction. The end of the outer rod away from the top wall is fixedly connected to the upper clamp. The side wall of the outer rod is provided with a locking knob. When the locking knob is tightened, the inner rod and the outer rod can be fixed relative to each other.

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