Test fixture assembly for battery

Abstract

The utility model relates to a test fixture assembly for a battery. The test fixture assembly comprises a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are positioned to be opposite to each other and are spaced so as to form a clamping cavity for accommodating the battery between the first clamping plate and the second clamping plate; the fixing column extends to penetrate through the first clamping plate and the second clamping plate; the elastic piece is arranged on the fixing column in a sleeving mode and located outside the clamping cavity, and the elastic piece has a preset stiffness coefficient; the fastening piece is matched with the fixing column and is configured to compress the elastic piece to a preset initial position so as to restrain the battery in the clamping cavity; and the pressure detector is arranged at one end of the elastic piece so as to detect the pressure change of the elastic piece before and after the battery is expanded. The test fixture assembly does not need to be specially provided with a displacement detector, the structure can be simplified, and the machining cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of test equipment, and particularly relates to a test fixture assembly for a battery. Background Art

[0002] A storage battery is a device that can be charged by an external power source and store electrical energy for future use. Its working principle is that during charging, the external power source is used to regenerate the internal active substances, and the electrical energy is stored as chemical energy. When discharging is required, the chemical energy is converted back into electrical energy for output. Currently, storage batteries mainly include types such as lithium-ion batteries, lead-acid batteries, nickel-metal hydride batteries, etc. Among them, lithium-ion batteries have many advantages such as high energy density, long service life, no memory effect, and a wide working temperature range, so they are widely used in fields such as electric vehicles, electronic products, and energy storage devices.

[0003] The swelling performance is one of the important indicators to measure the quality of lithium-ion batteries. If the swelling performance is poor, it will not only reduce the cycle life and performance stability of lithium-ion batteries, but also may cause safety risks such as leakage and short circuit. When a lithium-ion battery is charging and discharging, the electrode plates inside the battery will expand, resulting in an increase in the overall thickness of the battery cell, and then causing changes in the battery structure. In addition, during the charging and discharging process, side reactions will occur among the chemical substances inside the battery and gases will be generated, resulting in an increase in the internal pressure of the battery and exacerbating the swelling of the battery case. Therefore, it is of great significance to study and control the swelling performance of lithium-ion batteries.

[0004] The prior art has developed a detection device for testing the swelling performance of lithium-ion batteries. For example, the Chinese utility model patent CN220602778U discloses a swelling detection device for a battery. The detection device includes components such as a first clamping plate, a second clamping plate, a third clamping plate, an elastic member, a pressure detection unit, and a displacement detection unit. Among them, the first clamping plate, the second clamping plate, and the third clamping plate are arranged at intervals on one side. The elastic member is arranged between the second clamping plate and the third clamping plate. The pressure detection unit is arranged on the first clamping plate or the second clamping plate, and the displacement detection unit is arranged between the second clamping plate and the third clamping plate. However, this detection device has more components, a relatively complex structure, and a relatively high overall processing cost.

[0005] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Utility Model

[0006] In order to solve or to a certain extent improve the technical problem of the complex structure of the detection device for testing the expansion performance of a battery in the prior art, the present utility model provides a test fixture assembly for a battery. The test fixture assembly includes: a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are positioned opposite to and spaced apart from each other to form a clamping cavity therebetween for accommodating the battery; a fixing column, the fixing column extends through the first clamping plate and the second clamping plate; an elastic member, the elastic member is sleeved on the fixing column and is located outside the clamping cavity, and the elastic member has a predetermined stiffness coefficient; a fastener, the fastener is matched with the fixing column and is configured to compress the elastic member to a predetermined initial position to constrain the battery in the clamping cavity; and a pressure detector, the pressure detector is arranged at one end of the elastic member to detect the pressure change of the elastic member before and after the battery expands.

[0007] Those skilled in the art can understand that the test fixture assembly for a battery of the present utility model includes a first clamping plate, a second clamping plate, a fixing column, an elastic member, a fastener and a pressure detector. Among them, the first clamping plate and the second clamping plate are positioned opposite to and spaced apart from each other to form a clamping cavity therebetween for accommodating the battery to be tested. The fixing column extends through the first clamping plate and the second clamping plate. The elastic member has a predetermined stiffness coefficient, and the elastic member is sleeved on the fixing column and is located outside the clamping cavity. The fastener is matched with the fixing column and is configured to compress the elastic member to a predetermined initial position so as to constrain the battery placed in the clamping cavity therein. The pressure detector is arranged at one end of the elastic member to detect the pressure change of the elastic member before and after the battery expands. Therefore, the test fixture assembly of the present utility model can stably clamp the battery between the first clamping plate and the second clamping plate, accurately sense the degree of expansion by using the elastic member with a predetermined stiffness coefficient, and accurately obtain the expansion displacement value of the battery by using the pressure change measured by the pressure detector and the predetermined precision coefficient, without separately setting a special displacement detector, thereby streamlining the components, simplifying the overall structure and reducing the processing cost.

[0008] In a preferred technical solution of the above test fixture assembly for a battery, the test fixture assembly further includes: a fastening limiting member, the fastening limiting member is arranged on the fixing column to limit the position of the fastener on the fixing column. The setting of the fastening limiting member can limit the position of the fastener on the fixing column, thereby quickly and accurately realizing the installation of the fastener.

[0009] In the above - mentioned preferred technical solution of the test fixture assembly for a battery, the fastening and limiting member includes two limiting pieces opposite to each other and a connecting piece located between the two limiting pieces. Among them, through - holes allowing the fixing posts to pass through are formed in the limiting pieces, and each limiting piece is respectively arranged on the side of one of the first clamping plate and the second clamping plate away from the clamping cavity. Through the above - mentioned arrangement, the entire fastening and limiting member has a generally U - shaped structure, which is easy to process. In addition, each limiting piece is respectively arranged on the side of one of the first clamping plate and the second clamping plate away from the clamping cavity, which can also make the structure of the entire test fixture assembly more stable.

[0010] In the above - mentioned preferred technical solution of the test fixture assembly for a battery, the elastic member is arranged on the side of the first clamping plate away from the second clamping plate, and / or the elastic member is arranged on the side of the second clamping plate away from the first clamping plate. Through the above - mentioned arrangement, the arrangement positions of the elastic members can be enriched to meet the diverse requirements of the product.

[0011] In the above - mentioned preferred technical solution of the test fixture assembly for a battery, the fixing post is a bolt, the bolt includes a bolt head and a bolt rod connected to each other, the bolt head is located outside the clamping cavity, and the bolt rod passes through the first clamping plate and the second clamping plate respectively; the fastening member is a nut that forms a threaded fit with the bolt rod. Through the above - mentioned arrangement, the fixing post and the fastening member can have a simple structure and are convenient to manufacture.

[0012] In the above - mentioned preferred technical solution of the test fixture assembly for a battery, the elastic member is a helical spring, which has the advantages of simple manufacture, compact structure, wide deformation range, and precise adjustment performance.

[0013] In the above - mentioned preferred technical solution of the test fixture assembly for a battery, the pressure detector is sleeved on the fixing post and is located between the elastic member and the fastening member. Through the above - mentioned arrangement, the pressure change of the elastic member can be accurately detected.

[0014] In the above - mentioned preferred technical solution of the test fixture assembly for a battery, mounting grooves with openings facing the clamping cavity are formed on at least one of the first clamping plate and the second clamping plate; and the test fixture assembly further includes: a temperature detector, the temperature detector is arranged in the mounting groove to detect the temperature of the battery. Through the above - mentioned arrangement, the temperature of the battery during the test can be conveniently detected, providing data support for multi - dimensional evaluation of the battery performance.

[0015] In the above preferred technical solution of the test fixture assembly for a battery, the mounting groove extends along the length direction of the first clamping plate or the second clamping plate, and the ratio range between the length L1 of the mounting groove and the length L2 of the first clamping plate or the second clamping plate is 1 / 3 - 2 / 3. Through the above arrangement, the temperature detector can conveniently adjust its arrangement position, so as to more accurately obtain the temperature of the battery.

[0016] In the above preferred technical solution of the test fixture assembly for a battery, the first clamping plate and the second clamping plate are made of stainless steel, aluminum, or resin, so that they have good mechanical properties and temperature resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following describes the preferred embodiments of the present invention with reference to the drawings. In the drawings:

[0018] Figure 1 is a schematic structural diagram of an embodiment of the test fixture assembly for a battery and a battery of the present invention;

[0019] Figure 2 is a schematic structural diagram of an embodiment of the test fixture assembly for a battery of the present invention;

[0020] Figure 3 is a schematic structural diagram of an embodiment of the first clamping plate in the test fixture assembly for a battery of the present invention;

[0021] Figure 4 is a schematic structural diagram of an embodiment of the fastening and limiting member in the test fixture assembly for a battery of the present invention.

[0022] LIST OF REFERENCE NUMERALS:

[0023] 100, test fixture assembly; 110, first clamping plate; 111, perforation; 112, mounting groove; 120, second clamping plate; 130, clamping cavity; 140, fixing column; 141, bolt head; 142, bolt rod; 150, fastener; 160, elastic member; 170, pressure detector; 180, fastening and limiting member; 181, limiting piece; 1811, through hole; 182, connecting piece; 190, temperature detector; 200, battery. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following describes the preferred embodiments of the present invention with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0025] It should be noted that in the description of the present utility model, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description, rather than indicating or implying that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0026] In addition, it should also be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] In order to solve or to a certain extent improve the technical problem that the detection device for testing the expansion performance of a battery in the prior art has a complex structure, the present utility model provides a test fixture assembly 100 for a battery 200. The test fixture assembly 100 includes: a first clamping plate 110 and a second clamping plate 120, the first clamping plate 110 and the second clamping plate 120 are positioned opposite to each other and spaced apart to form a clamping cavity 130 therebetween for accommodating the battery 200; a fixing column 140, the fixing column 140 extends through the first clamping plate 110 and the second clamping plate 120; an elastic member 160, the elastic member 160 is sleeved on the fixing column 140 and is located outside the clamping cavity 130, and the elastic member 160 has a predetermined stiffness coefficient; a fastener 150, the fastener 150 is matched with the fixing column 140 and is configured to compress the elastic member 160 to a predetermined initial position to constrain the battery 200 in the clamping cavity 130; and a pressure detector 170, the pressure detector 170 is arranged at one end of the elastic member 160 to detect the pressure change of the elastic member 160 before and after the battery 200 expands.

[0028] As Figure 1 and Figure 2 shown, in one or more embodiments, the test fixture assembly 100 of the present utility model includes components such as a first clamping plate 110, a second clamping plate 120, a fixing column 140, an elastic member 160, a fastener 150 and a pressure detector 170, etc., to detect the expansion performance of the battery 200. The battery 200 can be a lithium-ion battery, a lead-acid battery or other suitable batteries.

[0029] Continue to refer to Figure 1 and Figure 2, the first clamping plate 110 and the second clamping plate 120 are positioned opposite to each other and spaced apart to form a clamping cavity 130 therebetween for accommodating the battery 200 to be tested. Based on Figure 1 and Figure 2 the shown orientation, in the assembled state, the first clamping plate 110 is located on the lower side, while the second clamping plate 120 is located on the upper side. Alternatively, the positions of the first clamping plate 110 and the second clamping plate 120 can also be interchanged. That is, the first clamping plate 110 is located on the upper side, while the second clamping plate 120 is located on the lower side. In one or more embodiments, the shape, size and material of the first clamping plate 110 are configured to be the same as those of the second clamping plate 120 for ease of processing. Alternatively, the first clamping plate 110 and the second clamping plate 120 can also be set to different shapes, sizes and materials according to actual needs. In one or more embodiments, each of the first clamping plate 110 and the second clamping plate 120 has a generally rectangular and rounded-corner shape, which is not only convenient for processing but also convenient for clamping the battery 200 to be tested. Alternatively, the first clamping plate 110 and the second clamping plate 120 can also adopt other suitable shapes, such as square, circular, etc. The specific dimensions (including length, width and thickness, etc.) of the first clamping plate 110 and the second clamping plate 120 can be adjusted according to actual needs as long as the battery 200 can be stably and firmly clamped. In one or more embodiments, the materials of the first clamping plate 110 and the second clamping plate 120 are stainless steel, aluminum, resin, etc., so that they have good mechanical properties and temperature resistance.

[0030] As Figures 1 - 3 shown, in one or more embodiments, 6 through holes 111 are provided at intervals on each of the first clamping plate 110 and the second clamping plate 120. Refer to Figure 3 , taking the first clamping plate 110 as an example, 3 through holes 111 are evenly spaced on the left side of the first clamping plate 110, while the other 3 through holes 111 are evenly spaced on the right side of the first clamping plate 110. Each through hole 111 allows a corresponding fixing post 140 to extend therethrough, so that when the battery 200 expands in the clamping cavity 130 between the first clamping plate 110 and the second clamping plate 120, the first clamping plate 110 or the second clamping plate 120 can be uniformly stressed. Alternatively, the number of through holes 111 can also be set to other suitable numbers more or less than 6, such as 5, 7, 8, etc. In addition, the through holes 111 can also be provided at other suitable positions on the first clamping plate 110 and the second clamping plate 120.

[0031] As Figure 3As shown, in one or more embodiments, an installation groove 112 is provided on the first clamping plate 110. In the assembled state, the opening of the installation groove 112 faces the clamping cavity 130, that is, faces the battery 200 to be tested. The test fixture assembly 100 of the present utility model further includes a temperature detector 190 disposed in the installation groove 112 to detect the temperature of the battery 200. The temperature detector 190 can be, but is not limited to, a thermal type temperature sensor, a thermal resistance type temperature sensor, an infrared temperature sensor, etc. The temperature detector 190 can be installed in the installation groove 112 by screwing, clamping, bonding or other suitable means. The setting of the installation groove 112 can facilitate the installation of the temperature detector 190 and prevent the temperature detector 190 from protruding too much, resulting in the battery 200 not being able to rest flat against the first clamping plate 110. In one or more embodiments, the installation groove 112 extends along the length direction of the first clamping plate 110 (based on Figure 3 the shown orientation, that is, the left-right direction), and the ratio range between the length L1 of the installation groove 112 and the length L2 of the first clamping plate 110 is 1 / 3 - 2 / 3. Through the above settings, the installation groove 112 can have a moderate length, which can not only flexibly adjust the position of the temperature detector 190, but also prevent the length of the installation groove 112 from being too long and affecting the accuracy of temperature detection. Preferably, the installation groove 112 is arranged in the middle of the first clamping plate 110 (that is, the installation groove 112 does not extend to the edge of the first clamping plate 110), so that the installation groove 112 has a semi-closed structure, thus creating a better test environment for temperature detection. Alternatively, the installation groove 112 can also be arranged on the second clamping plate 120. Further, the installation groove 112 can also be arranged on both the first clamping plate 110 and the second clamping plate 120 at the same time to detect the temperatures of different surfaces of the battery 200 simultaneously.

[0032] As Figure 1 and Figure 2 shown, the fixing posts 140 extend through the first clamping plate 110 and the second clamping plate 120 to fix the battery 200 in the clamping cavity 130 between the first clamping plate 110 and the second clamping plate 120. In one or more embodiments, the number of the fixing posts 140 is 6. Each fixing post 140 respectively passes through the corresponding through holes 111 on the first clamping plate 110 and the second clamping plate 120. Alternatively, the number of the fixing posts 140 can also be set to other suitable numbers more or less than 6, such as 5, 7, 8, etc. In one or more embodiments, the fixing posts 140 are bolts. Among them, the bolt includes a bolt head 141 and a bolt rod 142 connected to each other. The bolt head 141 is arranged outside the clamping cavity 130, while the bolt rod 142 respectively passes through the first clamping plate 110 and the second clamping plate 120. Based on Figure 1 and Figure 2In the orientation shown, the bolt head 141 is located on the lower side of the first clamping plate 110, and the bolt rod 142 sequentially passes through the through hole 111 on the first clamping plate 110 and the through hole 111 on the second clamping plate 120 from bottom to top and extends to the upper side of the second clamping plate 120.

[0033] As Figure 1 and Figure 2 shown, the elastic member 160 is sleeved on the fixed column 140 and is located outside the clamping cavity 130. Refer to Figure 1 and Figure 2 , in one or more embodiments, the elastic member 160 is arranged on the side of the second clamping plate 120 away from the first clamping plate 110. Based on Figure 1 and Figure 2 shown orientation, the elastic member 160 is arranged on the upper side of the second clamping plate 120. Alternatively, the elastic member 160 can also be arranged on the side of the first clamping plate 110 away from the second clamping plate 120, that is, located on the lower side of the first clamping plate 110. Further, the elastic member 160 can also be respectively arranged on the side of the first clamping plate 110 away from the second clamping plate 120 and the side of the second clamping plate 120 away from the first clamping plate 110. The elastic member 160 has a predetermined stiffness coefficient. The specific magnitude of the predetermined stiffness coefficient can be obtained through the factory parameters or tests of the elastic member 160. In one or more embodiments, the elastic member 160 is a helical spring, which has the advantages of simple manufacturing, compact structure, wide deformation range and precise adjustment performance. Alternatively, the elastic member 160 can also be set as other suitable components with elastic deformation and recovery ability, such as rubber parts, etc. The setting of the elastic member 160 can accurately sense the expansion degree of the battery 200 to be tested, and at the same time, according to Hooke's law (that is, within the elastic limit, the stress of an elastic object is proportional to the strain), the specific expansion displacement value of the battery 200 can be conveniently obtained without separately setting a dedicated displacement detector.

[0034] As Figure 1 and Figure 2As shown, the fastener 150 mates with the fixing post 140 and is configured to compress the elastic member 160 to a predetermined initial position to confine the battery 200 within the clamping cavity 130. In one or more embodiments, the fastener 150 is a nut that forms a threaded fit with the bolt rod 142. Specifically, an external thread (not shown in the figure) is formed on the outer peripheral surface of the bolt rod 142, and an internal thread mating with the external thread is formed on the inner peripheral surface of the nut, such that the nut can form a threaded fit with the screw rod. The provision of the nut enables the fastener 150 to be conveniently rotated along the fixing post 140 towards the second clamping plate 120, thereby flexibly compressing the elastic member 160. When the elastic member 160 is in the predetermined initial position, the elastic member 160 is in a compressed state and can exert a suitable predetermined pressure on the second clamping plate 120 to confine the battery 200 to be tested within the clamping cavity 130. It should be noted that the predetermined initial position needs to be comprehensively considered based on parameters such as the specifications of the battery 200 and the predetermined stiffness coefficient of the elastic member 160.

[0035] As Figure 1 and Figure 2 shown, the pressure detector 170 is arranged at one end of the elastic member 160 to detect the pressure change of the elastic member 160 before and after the battery 200 expands. The pressure detector 170 can be, but is not limited to, a strain type pressure sensor, a capacitive pressure sensor, etc. In one or more embodiments, the pressure detector 170 is sleeved on the fixing post 140 and located between the elastic member 160 and the fastener 150 to more accurately obtain the pressure change of each elastic member 160. Based on Figure 1 and Figure 2 the orientation shown, the pressure detector 170 is arranged at the upper end of the elastic member 160. Alternatively, the pressure detector 170 can also be arranged between the elastic member 160 and the second clamping plate 120, that is, the pressure detector 170 is arranged at the lower end of the elastic member 160.

[0036] As Figure 1 and Figure 2 shown, in one or more embodiments, the present utility model further includes a fastening limit member 180. The fastening limit member 180 is arranged on the fixing post 140 to limit the position of the fastener 150 on the fixing post 140, more quickly and accurately achieve the installation of the fastener 150, and then compress the elastic member 160 to the predetermined initial position. The fastening limit member 180 can be processed from a suitable metal material, such as stainless steel, aluminum, etc., to have good mechanical properties and structural stability.

[0037] As Figure 1 , Figure 2 and Figure 4As shown, in one or more embodiments, the fastening and limiting member 180 includes two limiting pieces 181 opposite to each other and a connecting piece 182 located between the two limiting pieces 181. Among them, through holes 1811 allowing the fixing posts 140 to pass through are formed in the limiting pieces 181. Each limiting piece 181 is respectively arranged on one side of the corresponding one of the first clamping plate 110 and the second clamping plate 120 away from the clamping cavity 130. Through the above arrangement, the whole fastening and limiting member 180 has a substantially U-shaped shape, which is not only convenient for processing but also can ensure the structural stability of the fastening and limiting member 180. More specifically, in the assembled state, each limiting piece 181 is substantially parallel to the first clamping plate 110 or the second clamping plate 120, and the connecting piece 182 is substantially parallel to the fixing post 140. Based on Figure 1 and Figure 2 the orientations shown, the lower limiting piece 181 (or the lower limiting piece) is located between the bolt head 141 and the first clamping plate 110, and the upper limiting piece 181 (or the upper limiting piece) is located between the nut and the pressure detector 170. In this way, the pressure detector 170, the elastic member 160, the second clamping plate 120, the battery 200, and the first clamping plate 110 can all be constrained between the two limiting pieces, thereby improving the structural stability of the whole test fixture assembly 100. Alternatively, the two limiting pieces 181 of the fastening and limiting member 180 can also be arranged at other suitable positions. For example, the lower limiting piece is arranged on the lower side of the second clamping plate 120, and the upper limiting piece is arranged between the fastening member 150 and the pressure detector 170.

[0038] When the test fixture assembly 100 of the present utility model is in use, first, the battery 200 to be tested is placed in the clamping cavity 130 between the first clamping plate 110 and the second clamping plate 120. Then, the fixing post 140 is sequentially passed through the lower limiting piece of the fastening and limiting member 180, the first clamping plate 110, the second clamping plate 120, the elastic member 160, the pressure detector 170, and the upper limiting piece of the fastening and limiting member 180, so that the pressure detector 170, the elastic member 160, the second clamping plate 120, the battery 200, and the first clamping plate 110 are constrained between the two limiting pieces 181 of the fastening and limiting member 180. Then, the fastening member 150 is fixed on the fixing post 140. Due to the setting of the fastening and limiting member 180, the position of the fastening member 150 on the fixing post 140 can be limited, so that the elastic member 160 can be quickly and accurately positioned to the predetermined initial position, improving the test efficiency. Then, a suitable charging and discharging device (not shown in the figure) is used to test the battery 200, and the pressure of the battery 200 within a certain test time is recorded. Finally, the expansion displacement value of the battery 200 is calculated according to the measured pressure and the predetermined stiffness coefficient of the elastic member 160. It should be noted that the above sequence of test steps is not fixed, and the user can adjust it according to actual needs.

[0039] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A test fixture assembly for a battery, characterized in that, The test fixture assembly includes: A first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are positioned opposite to each other and spaced apart to form a clamping cavity therebetween for accommodating the battery; A fixing post, the fixing post extends through the first clamping plate and the second clamping plate; An elastic member, the elastic member is sleeved on the fixing post and located outside the clamping cavity, and the elastic member has a predetermined stiffness coefficient; A fastener, the fastener is matched with the fixing post and configured to compress the elastic member to a predetermined initial position to constrain the battery in the clamping cavity; and A pressure detector, the pressure detector is arranged at one end of the elastic member to detect the pressure change of the elastic member before and after the battery expands.

2. The test fixture assembly for a battery according to claim 1, characterized in that, The test fixture assembly further includes: A fastening limit member, the fastening limit member is arranged on the fixing post to limit the position of the fastener on the fixing post.

3. The test fixture assembly for a battery according to claim 2, characterized in that, The fastening limit member includes two opposite limit pieces and a connecting piece located between the two limit pieces. Wherein, through holes allowing the fixing post to pass through are formed in the limit pieces, and each of the limit pieces is respectively arranged on one side of the corresponding one of the first clamping plate and the second clamping plate away from the clamping cavity.

4. The test fixture assembly for a battery according to claim 1, wherein, The elastic member is arranged on the side of the first clamping plate away from the second clamping plate, and / or The elastic member is arranged on the side of the second clamping plate away from the first clamping plate.

5. The test fixture assembly for a battery according to claim 1, wherein, The fixing post is a bolt, the bolt includes a bolt head and a bolt rod connected to each other, the bolt head is located outside the clamping cavity, and the bolt rod respectively passes through the first clamping plate and the second clamping plate; The fastener is a nut that forms a threaded fit with the bolt rod.

6. The test fixture assembly for a battery according to claim 1, wherein, The elastic member is a helical spring.

7. The test fixture assembly for a battery according to claim 1, characterized in that, The pressure detector is sleeved on the fixing post and located between the elastic member and the fastener.

8. The test fixture assembly for a battery according to claim 1, wherein, An installation groove with an opening facing the clamping cavity is formed on at least one of the first clamping plate and the second clamping plate; And The test fixture assembly further includes: a temperature detector, the temperature detector is arranged in the installation groove to detect the temperature of the battery.

9. The test fixture assembly for a battery according to claim 8, wherein, The installation groove extends along the length direction of the first clamping plate or the second clamping plate, and the ratio range of the length L1 of the installation groove to the length L2 of the first clamping plate or the second clamping plate is 1 / 3 - 2 / 3.

10. The test fixture assembly for a battery according to claim 1, characterized in that, The materials of the first clamping plate and the second clamping plate are stainless steel, aluminum, resin.

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