Battery cell test fixture

Abstract

The utility model belongs to the technical field of battery testing, and discloses a battery cell testing clamp which comprises a clamping assembly, a heat transfer piece and a first insulating piece, the clamping assembly abuts against two first surfaces of a battery cell, the heat transfer piece abuts against at least one second surface of the battery cell, and the first insulating piece abuts against the two first surfaces of the battery cell. The heat transfer part is used for conducting out heat of the battery cell, and the first heat insulation part is connected to the clamping assembly and can prevent the heat of the battery cell from being transferred outwards from the first surface and the third surface. The battery cell test fixture can produce temperature difference in the test process, so that the performance of the whole battery pack can be better evaluated by the measured performance of the battery cell, a liquid cooling structure does not need to be additionally added in the test process, and the energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing, in particular to a cell testing fixture. Background Art

[0002] At present, in the whole battery pack, usually one narrow side of the cell contacts with the cold source, and the heat generated by the cell is taken away by the cold source after being exchanged through this narrow side with the cold source. This will cause a certain temperature difference between the part of the cell close to the cold source and the part far from the cold source. The difference in the cell temperature distribution will affect the performance of the cell. Currently, the existing cell rate performance test and cycle life test are generally carried out in a blast air thermostat. The large surface of the cell is clamped by the cell testing fixture, and the narrow side of the cell dissipates heat under the action of the air cooling in the thermostat.

[0003] However, the existing cell testing fixture can only apply pressure towards the large surface of the cell, and it is difficult to create a temperature difference in the cell. In this way, the experiment cannot simulate the cooling efficiency of the cell in actual operation, and the performance difference caused by the actual temperature difference cannot be measured. As a result, it is difficult to evaluate the performance of the whole pack based on the performance of the cell, especially the cycle life. In addition, if a water pipe is set as the cold source and used in combination with the cell testing fixture, firstly, additional energy consumption is required for continuous water circulation cooling; secondly, for a cell with a relatively thin thickness, the diameter of the water pipe needs to be small, which is not easy to prepare; thirdly, the water pipe requires a certain wall thickness. If the wall thickness is relatively thin, there will be a risk of liquid leakage. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cell testing fixture, which can create a temperature difference during the testing process, so that the performance measured by the cell can better evaluate the performance of the whole battery pack, and no additional liquid cooling structure needs to be added during the testing process, reducing energy consumption.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] The utility model discloses a cell testing fixture. The cell has two first surfaces, two second surfaces and two third surfaces. The third surface is used to set the tab of the cell. The area of the first surface is larger than that of the second surface. The cell testing fixture includes: a clamping assembly that abuts against the two first surfaces of the cell; a heat transfer member that abuts against at least one of the second surfaces of the cell and is used to export the heat of the cell; a first heat insulation member that is connected to the clamping assembly; and the first heat insulation member can block the heat of the cell from being transferred outwards from the first surface and the third surface.

[0007] In some embodiments, the first heat insulator includes a heat insulating material piece having a cavity formed therein, the battery cell is located within the cavity, and at least a portion of the heat transfer member is located outside the cavity.

[0008] In some embodiments, the battery cell test fixture further includes a heat conducting member, and the heat conducting member is clamped between the heat transfer member and the second surface.

[0009] In some specific embodiments, the heat conducting coefficient of the heat conducting member is 1 W / (m·K) - 5 W / (m·K).

[0010] In some embodiments, the specific heat capacity of the heat transfer member is 200 J / (kg·°C) or -1000 J / (kg·°C) and / or the latent heat value of the heat transfer member is 100 J / g - 600 J / g, and / or: the material of the heat transfer member is copper, aluminum, nickel, iron, copper alloy, aluminum alloy, nickel alloy, iron alloy or phase change material.

[0011] In some embodiments, the battery cell test fixture further includes a second heat insulator, and the second heat insulator is located between the clamping assembly and the first surface.

[0012] In some embodiments, the heat conducting coefficient of the second heat insulator is 0.01 W / (m·K) - 0.06 W / (m·K); and / or: the thickness of the second heat insulator is 0.3 mm - 1 mm.

[0013] In some embodiments, the clamping assembly includes two clamping members, the two clamping members respectively abut against the two first surfaces of the battery cell, and the two clamping members are connected by a connecting member to adjust the pressure applied by the clamping members to the battery cell.

[0014] In some specific embodiments, mounting holes are provided on both of the two clamping members, the connecting member includes a connecting bolt and a connecting nut, and the connecting bolt passes through the two mounting holes and cooperates with the connecting nut.

[0015] In some specific embodiments, the heat conducting coefficient of the first heat insulator is 0.01 W / (m·K) - 0.06 W / (m·K); and / or: the thickness of the first heat insulator is 5 mm - 20 mm.

[0016] Beneficial effects of the cell test fixture of the present utility model: During the actual test process, the cell is clamped in the middle of the clamping assembly. At least one second surface of the cell is provided with a heat transfer member, and the heat transfer member can conduct the heat of the cell from the second surface. The added first heat insulation member can block the heat of the cell from diffusing outward from the first surface and the third surface. During the actual test process, the temperature of the cell near the heat transfer member is relatively low (for example, the end near the second surface), and the temperature of the cell far from the heat transfer member is relatively high (for example, the middle of the cell), simulating the temperature difference between the part of the cell close to the cold source and the part far from the cold source during the actual working process, making the state of the cell during the test more in line with the actual use situation, making the test value of the cell closer to the test value of the battery pack, which has a positive significance for the structural design of the cell pack. Moreover, the added heat transfer member replaces the cold water pipe structure in the prior art, reducing the manufacturing cost and test energy consumption.

[0017] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the cell test fixture of the first aspect of the present utility model;

[0019] Figure 2 is a schematic vertical sectional view of the cell test fixture of the first aspect of the present utility model;

[0020] Figure 3 is a schematic horizontal sectional view of the cell test fixture of the first aspect of the present utility model;

[0021] Figure 4 is a schematic structural diagram of the cell test fixture of the second aspect of the present utility model;

[0022] Figure 5 is a schematic structural diagram of the cell test fixture of the third aspect of the present utility model;

[0023] Figure 6 is a schematic structural diagram of the cell test fixture of the fourth aspect of the present utility model.

[0024] Reference Signs:

[0025] 100, clamping assembly; 110, clamping member; 120, clamping groove;

[0026] 200, heat transfer member;

[0027] 300, first heat insulation member; 400, heat conducting member; 500, second heat insulation member;

[0028] 600, Connecting member; 610, Connecting bolt; 620, Connecting nut;

[0029] 700, Battery cell; 710, First surface; 720, Second surface; 730, Third surface; 740, Tab. Detailed implementation mode

[0030] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all structures are shown in the drawings.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can include the direct contact between the first and second features, or can also include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top", and "on the top" of the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "below the bottom", and "under the bottom" of the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for differentiation in description and do not have special meanings.

[0034] Embodiment 1:

[0035] The utility model discloses a cell testing fixture. The cell 700 has two first surfaces 710, two second surfaces 720 and two third surfaces 730. The third surface 730 is used to set the tabs 740 of the cell 700, and the area of the first surface 710 is larger than that of the second surface 720. Refer to Figure 1 and Figure 3 As shown, the cell testing fixture includes a clamping assembly 100, a heat transfer member 200 and a first heat insulating member 300. The clamping assembly 100 abuts against the two first surfaces 710 of the cell 700. The heat transfer member 200 abuts against at least one second surface 720 of the cell 700, and the heat transfer member 200 is used to conduct out the heat of the cell 700. The first heat insulating member 300 is connected to the clamping assembly 100, and the first heat insulating member 300 can block the heat of the cell 700 from being transferred outward from the first surface 710 and the third surface 730.

[0036] It can be understood that during the actual testing process, the cell 700 is clamped in the middle of the clamping assembly 100. At least one second surface 720 of the cell 700 is provided with a heat transfer member 200, and the heat transfer member 200 can conduct out the heat of the cell 700 from the second surface 720. The added first heat insulating member 300 can block the heat of the cell 700 from diffusing outward from the first surface 710 and the third surface 730, so that during the actual testing process, the temperature of the cell 700 near the heat transfer member 200 is lower (for example, the end near the second surface 720), and the temperature of the cell 700 far from the heat transfer member 200 is relatively higher (for example, the middle of the cell 700), realizing the simulation of the temperature difference between the part of the cell 700 close to the cold source and the part far from the cold source during the actual working process, making the state of the cell 700 during the testing process more in line with the actual use situation, making the test value of the cell 700 closer to the test value of the battery pack, which has a positive significance for the structural design of the cell 700 package. And the added heat transfer member 200 replaces the cold water pipe structure in the prior art, reducing the manufacturing cost and the testing energy consumption.

[0037] It should be added that when there is one heat transfer member 200, there is a temperature difference between the two second surfaces 720 of the cell 700; when there are two heat transfer members 200 and the two heat transfer members 200 are the same, the temperatures of the two second surfaces 720 of the cell 700 are basically equal and lower than the temperatures of other parts of the cell 700; when there are two heat transfer members 200 and the two heat transfer members 200 are different, for example, at least one of the parameters such as material and thickness is different, there is a temperature difference between the two second surfaces 720 of the cell 700. During the actual testing process, the number and material of the heat transfer member 200 can be set according to the specific requirements of the cell 700 testing.

[0038] Refer to Figure 2As shown, the first heat insulating member 300 includes a heat insulating material member formed with a cavity, the battery cell 700 is located in the cavity, and at least a portion of the heat transfer member 200 is located outside the cavity. It is understandable that in the actual test process, the battery cell 700 can be clamped by the clamping assembly 100 first, and then the heat transfer member 200 is attached to a second surface 720 of the battery cell 700, and finally the entire structure is inserted into the cavity of the first heat insulating member 300, so that at least a portion of the heat transfer member 200 is located outside the cavity, which is convenient for installation and disassembly, thereby facilitating the test, and on the other hand, the heat of the heat transfer member 200 can be quickly diffused to the external environment, so that the test environment is more in line with the actual working conditions.

[0039] It should be noted that when there is only one heat transfer element 200, the first heat insulating element 300 can be selectively connected to the second surface 720 where no heat transfer element 200 is provided, so as to achieve heat insulation of the second surface 720. At this time, the heat of the battery cell is only conducted through the second surface 720 and the heat transfer element 200 abutting against it, so as to accurately simulate the temperature difference. Further, the first heat insulating element 300 can be made of heat insulating materials such as foam materials, so that it can ensure the protection effect of the relevant surface (i.e., the second surface 720 where no heat transfer element 200 is provided). Of course, the material of the first heat insulating element 300 can also be selected from other materials according to actual needs.

[0040] Optionally, the thermal conductivity of the first thermal insulation member 300 is 0.01W / (m·K)-0.06W / (m·K). The smaller the thermal conductivity of the first thermal insulation member 300 is, the better the thermal insulation effect is. In other embodiments of the present invention, the thermal conductivity of the first thermal insulation member 300 can be selected according to actual needs.

[0041] Optionally, the thickness of the first thermal insulation member 300 is 5mm-20mm. First of all, it should be noted that the thickness of the first thermal insulation member 300 refers to the thickness of the first thermal insulation member 300 attached to the clamping assembly 100 when the clamping assembly 100 stops at the entire first surface 710 of the battery cell 700. Too small a thickness will reduce the thermal insulation effect of the first thermal insulation member 300, and too large a thickness will cause material waste. In this embodiment, controlling the thickness of the first thermal insulation member 300 to be between 5mm-20mm can ensure the thermal insulation effect of the first thermal insulation member 300 and ensure a temperature difference between the two ends of the battery cell 700, while avoiding material waste and controlling the manufacturing cost of the battery cell test fixture.

[0042] refer to Figure 2As shown, the battery cell test fixture further includes a heat conducting member 400, and the heat conducting member 400 is clamped between the heat transfer member 200 and the second surface 720. During the actual working process, the heat conducting member 400 conducts the heat of the battery cell 700 to the heat transfer member 200, thereby realizing the rapid transfer of the heat of the battery cell 700 to better conform to the actual working conditions as much as possible. It should be added that during the actual test, the heat transfer member 200 and the heat conducting member 400 can be reasonably installed according to the type of the battery cell 700 to be actually tested and the test requirements, so as to ensure that there is a large temperature difference between the part of the battery cell 700 close to the heat conducting member 400 and the part far from the heat conducting member 400, so as to better conform to the actual working conditions as much as possible.

[0043] Optionally, the heat conductivity of the heat conducting member 400 is 1 W / (m·K) - 5 W / (m·K). The heat conductivity of the heat conducting member 400 can also be selected according to actual needs.

[0044] Optionally, the heat transfer member 200 includes at least one of heat conducting gel and heat conducting pad. The material of the heat transfer member 200 can also be selected according to actual needs.

[0045] Optionally, the specific heat capacity of the heat transfer member 200 is 200 J / (kg·℃) - 1000 J / (kg·℃). The specific heat capacity of the heat transfer member 200 can also be selected according to actual needs, and is not limited to the above range.

[0046] Optionally, the latent heat value of the heat transfer member 200 is 100 J / g - 600 J / g. The latent heat value of the heat transfer member 200 can also be selected according to actual needs, and is not limited to the above range.

[0047] Optionally, the material of the heat transfer member 200 is copper, aluminum, nickel, iron, copper alloy, aluminum alloy, nickel alloy, or iron alloy. The material of the heat transfer member 200 can be any one or any combination of the above examples. And at least part of the heat transfer member 200 is located outside the first heat insulating member 300. It can be understood that when the material of the heat transfer member 200 is metal or alloy, at least part of the heat transfer member 200 is located outside the first heat insulating member 300, so that the heat on the heat transfer member 200 can be quickly transferred into the constant temperature box, avoiding the adverse effect on the battery cell 700 caused by the temperature rise of the heat transfer member 200, thus better conforming to the actual working conditions of the battery cell 700.

[0048] Optionally, the heat transfer member 200 is a phase change material. It can be understood that due to the characteristics of the phase change material, the heat transfer member 200 being a phase change material can transfer the heat of the battery cell 700 to create a temperature difference. The phase change material can absorb and store heat through a phase change reaction and the temperature change of the phase change material itself is relatively small. During the actual assembly process, the heat transfer member 200 can also be wrapped in the first heat insulation member 300 to simulate the battery cell 700 under special working conditions.

[0049] Optionally, a part of the clamping assembly 100 is located outside the first heat insulation member 300. It can be understood that when the size of the clamping assembly 100 is larger than the size of the first surface 710, the part of the clamping assembly 100 that extends beyond the first surface 710 and is located outside the first heat insulation member 300 will not affect the generation of the temperature difference. This can reduce the size of the first heat insulation member 300 and is beneficial to reducing the manufacturing cost.

[0050] Reference Figures 2-3 As shown, the battery cell test fixture further includes a second heat insulation member 500, and the second heat insulation member 500 is located between the clamping assembly 100 and the first surface 710. It can be understood that during the actual test process, although the first heat insulation member 300 is provided and the heat inside the first heat insulation member 300 will not be transferred out too quickly, if the heat generated by the battery cell 700 during the test is quickly transferred to the clamping assembly 100, causing the temperature of the clamping assembly 100 to rise, this will also have an adverse impact on the final test result. In this embodiment, a second heat insulation member 500 is added. The second heat insulation member 500 is located between the clamping assembly 100 and the first surface 710, which can reduce the heat generated by the battery cell 700 from being transferred towards the clamping assembly 100, thereby avoiding the adverse impact on the test caused by the temperature rise of the clamping assembly 100 and being beneficial to improving the test accuracy.

[0051] Optionally, the second heat insulation member 500 includes a heat insulation material that fits against the side wall of the clamping assembly 100 facing the first surface 710. For example, the second heat insulation member 500 can be aerogel, and of course other materials can also be used.

[0052] Optionally, the thermal conductivity of the second heat insulation member 500 is 0.01 W / (m·K) - 0.06 W / (m·K). Of course, the thermal conductivity of the second heat insulation member 500 can also be selected according to actual needs and is not limited to the above description.

[0053] Optionally, the thickness of the second heat insulator 500 is 0.3 mm - 1 mm. If the thickness is too small, the heat insulation effect of the second heat insulator 500 will be reduced. If the thickness is too large, material waste will be caused. In this embodiment, controlling the thickness of the second heat insulator 500 between 0.3 mm and 1 mm can not only ensure the heat insulation effect of the second heat insulator 500, reduce the heat generated by the battery cell 700 from transferring towards the clamping assembly 100, but also avoid material waste and control the manufacturing cost of the battery cell test fixture.

[0054] Refer to Figures 2-3 As shown, the clamping assembly 100 includes two clamping members 110. The two clamping members 110 respectively abut against two first surfaces 710 of the battery cell 700, and the second heat insulator 500 is attached to the surface of the clamping member 110 facing the battery cell 700. The two clamping members 110 are connected by a connecting member 600 to adjust the pressure applied by the clamping members 110 to the battery cell 700. It can be understood that during the actual test process, first attach the second heat insulator 500 to the clamping member 110, then attach the two clamping members 110 to the two first surfaces 710 of the battery cell 700, then connect the clamping members 110 through the connecting member 600, and adjust the pressure applied by the clamping members 110 to the battery cell 700. Using two clamping members 110 as the structure of the clamping assembly 100, the test operation is very convenient and can be applied to battery cells 700 of various thicknesses.

[0055] Optionally, mounting holes are provided on both of the two clamping members 110. The connecting member 600 includes a connecting bolt 610 and a connecting nut 620. The connecting bolt 610 passes through the two mounting holes and cooperates with the connecting nut 620. It can be understood that during the actual assembly process, pass the connecting bolt 610 through the two mounting holes in sequence and cooperate with the connecting nut 620, and then adjust the pressure on the battery cell 700 by rotating the nut, and the operation is very convenient.

[0056] In order to ensure that the pressure of the clamping member 110 on the battery cell 700 is relatively uniform, multiple connecting members 600 can be provided, and the multiple connecting members 600 are spaced along the contour of the clamping member 110.

[0057] Embodiment 2:

[0058] The structure of the battery cell test fixture in this embodiment is substantially the same as that in Embodiment 1. The difference is that, refer to Figure 4 As shown, the connecting member 600 in this embodiment only includes a connecting bolt 610. One of the two mounting holes is a threaded hole, and the connecting bolt 610 is threadedly connected to the threaded hole after passing through one mounting hole. During the actual assembly process, pass the connecting bolt 610 through a clearance hole and cooperate with the threaded hole, and then adjust the pressure on the battery cell 700 through the connecting bolt 610, and the operation is very convenient.

[0059] Embodiment 3:

[0060] The structure of the battery cell test fixture in this embodiment is substantially the same as that in the first embodiment. The difference is that, referring to Figure 5 as shown, the clamping assembly 100 in this embodiment is an integral structure and is made of an elastic material. The clamping assembly 100 has a clamping groove 120. Adiabatic layers are provided on two opposite side walls of the clamping groove 120 to form a second adiabatic member 500. The battery cell 700 is clamped in the clamping groove 120.

[0061] Embodiment Four:

[0062] The structure of the battery cell test fixture in this embodiment is substantially the same as that in the first embodiment. The difference is that, referring to Figure 6 as shown, the battery cell test fixture in this embodiment includes two heat transfer members 200.

[0063] Embodiment Five:

[0064] The structure of the battery cell test fixture in this embodiment is substantially the same as that in the first embodiment. The difference is that an adiabatic coating is applied on the side wall of the clamping plate facing away from the first surface 710, and the adiabatic coating forms a second adiabatic member 500.

[0065] The advantages of the battery cell test fixture in the above embodiments are as follows:

[0066] First, setting the heat transfer member 200 can create a temperature difference for the battery cell 700, and the setting is simple without the need for additional liquid cooling, reducing energy consumption;

[0067] Second, the size of the heat transfer member 200 can be flexibly set according to the size of different battery cells 700. Especially for the battery cell 700 with a relatively narrow thickness, it is convenient for testing;

[0068] Third, the size and material of the heat transfer member 200 can be adjusted according to the cooling power conversion of different battery packs, better simulating the cooling situation of a single battery cell 700, making the test value closer to the real performance of the usage scenario, and improving reliability.

[0069] In the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0070] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A cell test fixture, the cell (700) has two first surfaces (710), two second surfaces (720) and two third surfaces (730), the third surfaces (730) are used to arrange the tabs (740) of the cell (700), and the area of the first surfaces (710) is larger than that of the second surfaces (720), characterized in that, The battery cell test fixture includes: A clamping assembly (100) that abuts against two of the first surfaces (710) of the battery cell (700); A heat transfer member (200) that abuts against at least one of the second surfaces (720) of the battery cell (700), and the heat transfer member (200) is used to conduct out the heat of the battery cell (700); A first heat insulating member (300) that is connected to the clamping assembly (100); and the first heat insulating member (300) can block the heat of the battery cell (700) from being transferred outwards from the first surface (710) and the third surface (730).

2. The cell test fixture according to claim 1, wherein The first heat insulating member (300) includes a heat insulating material member having a cavity, the battery cell (700) is located inside the cavity, and at least a part of the heat transfer member (200) is located outside the cavity.

3. The cell testing fixture according to claim 1, wherein, The battery cell test fixture further includes a heat conducting member (400) that is clamped between the heat transfer member (200) and the second surface (720).

4. The cell test fixture according to claim 3, characterized in that, The heat conducting coefficient of the heat conducting member (400) is 1 W / (m·K) - 5 W / (m·K).

5. The cell test fixture according to claim 3, characterized in that, The specific heat capacity of the heat transfer member (200) is 200 J / (kg·°C) or -1000 J / (kg·°C) and / or the latent heat value of the heat transfer member (200) is 100 J / g - 600 J / g, and / or: The material of the heat transfer member (200) is copper, aluminum, nickel, iron, copper alloy, aluminum alloy, nickel alloy, iron alloy or phase change material.

6. The cell test fixture according to claim 1, wherein, The battery cell test fixture further includes a second heat insulating member (500) that is located between the clamping assembly (100) and the first surface (710).

7. The cell testing fixture according to claim 6, wherein The heat conducting coefficient of the second heat insulating member (500) is 0.01 W / (m·K) - 0.06 W / (m·K); and / or: The thickness of the second heat insulating member (500) is 0.3 mm - 1 mm.

8. The cell test fixture according to any one of claims 1-7, characterized in that, The clamping assembly (100) includes two clamping members (110), the two clamping members (110) respectively abut against two of the first surfaces (710) of the battery cell (700), and the two clamping members (110) are connected by a connecting member (600) to adjust the pressure applied by the clamping members (110) to the battery cell (700).

9. The cell test fixture according to claim 8, wherein Mounting holes are provided on both of the two clamping members (110), the connecting member (600) includes a connecting bolt (610) and a connecting nut (620), and the connecting bolt (610) passes through the two mounting holes and cooperates with the connecting nut (620).

10. The cell test fixture according to any one of claims 1-7, characterized in that, The heat conducting coefficient of the first heat insulating member (300) is 0.01 W / (m·K) - 0.06 W / (m·K); and / or: The thickness of the first heat insulating member (300) is 5 mm - 20 mm.

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