Battery test fixture

Abstract

The embodiment of the utility model provides a battery test fixture. The battery test fixture comprises a base, a clamping plate assembly, a pressure test part, a cover plate assembly and a disc spring, wherein the base is provided with a guide part extending along a first direction; the clamping plate assembly is slidably provided with a guide part along a first direction and is used for clamping a single battery; the pressure testing part is arranged between the base and the clamping plate assembly, the cover plate assembly comprises a cover plate and a first fastener, the cover plate is arranged on the guide part in a sliding mode, the first fastener is connected with the guide part and used for limiting the cover plate to move along the side away from the base, and the first fastener applies pressure to the clamping plate assembly through the cover plate; the disc spring is arranged between the cover plate and the clamping plate assembly, the compression stroke of the disc spring is h0, the plate thickness of the disc spring is t, and h0 / t meets the formula of 1.4-1.45. According to the technical scheme provided by the invention, the structure is simple, the pressure can be kept relatively constant in the testing process of the all-solid-state battery monomer, and the electrical performance of the all-solid-state battery monomer can be developed.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a battery testing fixture. Background Art

[0002] Since all-solid-state batteries do not have electrolytes, electrons and ions need to be transferred through contact between particles inside the all-solid-state battery. During the charging and discharging process of all-solid-state battery cells, the battery cells themselves inevitably undergo volume deformation, which changes the pressure applied by the fixture to the battery cells, and the contact relationship between particles will also change accordingly. Since solid-state battery cells need to transfer electrons and ions through particle contact, this will affect the electrical performance of the battery cells.

[0003] In the process of electrical performance testing of solid-state battery cells by existing conventional fixtures, the battery cells are generally clamped at constant pressure through a hydraulic system. However, the equipment is large, the structure is complex, and the cost is high, making it unsuitable for mass use. Utility Model Content

[0004] The present application provides a battery testing fixture with a simple structure, which can maintain a relatively constant pressure during the testing of an all-solid-state battery cell, thereby facilitating the electrical performance of the all-solid-state battery cell.

[0005] This application is achieved through the following technical solutions:

[0006] An embodiment of the present application provides a battery testing fixture, which includes a base, a clamping plate assembly, a pressure testing component, a cover plate assembly and a disc spring, wherein the base is provided with a guide portion extending along a first direction; the clamping plate assembly is slidably provided with a guide portion along the first direction, and the clamping plate assembly is used to clamp a battery cell; the pressure testing component is arranged between the base and the clamping plate assembly, and the cover plate assembly includes a cover plate and a first fastener, the cover plate is slidably provided on the guide portion, and is located on a side of the clamping plate assembly away from the base, the first fastener is connected to the guide portion, and is used to limit the cover plate from moving along a side away from the base, and the first fastener applies pressure to the clamping plate assembly through the cover plate; the disc spring is arranged between the cover plate and the clamping plate assembly, the compression stroke of the disc spring is h0, the plate thickness of the disc spring is t, and h0 / t satisfies: 1.4-1.45.

[0007] In this solution, the battery cell is an all-solid-state battery cell, and a guide portion is provided on the base. The clamping plate assembly and the cover plate can be slidably provided on the guide portion. After the clamping plate assembly clamps the battery cell, the clamping plate assembly contacts the pressure test component, and the disc spring is provided between the clamping plate assembly and the cover plate. After the cover plate is locked by the first fastener, the clamping and fixing of the battery test fixture is completed. The first fastener applies a locking force to the cover plate, and transmits force to the battery cell in the clamping plate assembly through the disc spring. The pressure test component realizes pressure detection of the battery cell during the charging and discharging process. During the charging and discharging test of the all-solid-state battery cell, the volume of the battery cell will change due to the expansion or contraction of the powder of the all-solid-state battery cell. Through the setting of the disc spring, the disc spring h0 / t satisfies: 1.4-1.45, so that the disc spring has a zero stiffness characteristic. Even if the all-solid-state battery cell expands or contracts, the clamp assembly moves along the guide part, causing the compression of the disc spring to increase or decrease. According to the zero stiffness characteristic of the disc spring, the compression (strain) of the disc spring changes within the preset compression strain range of the disc spring, and the pressure of the disc spring changes very little or tends to remain unchanged, so that the pressure transmitted by the disc spring to the all-solid-state battery cell is relatively constant. During the deformation of the battery cell, the disc spring provides pressure compensation for the battery cell. Compared with the conventional clamp in the prior art that maintains constant pressure through a hydraulic system, the setting of the disc spring can provide pressure compensation for the battery cell, allowing the electrical properties of the all-solid-state battery cell to be fully utilized, and the clamp has a simple structure and a small size, which is conducive to batch use.

[0008] According to some embodiments of the present application, the clamp assembly includes a first clamp and a second clamp, both of which are slidably arranged on a guide portion along a first direction, and the first clamp and the second clamp are used to clamp the battery cell; the first clamp is closer to the base than the second clamp, the pressure testing component is arranged between the base and the first clamp, and the disc spring is arranged between the second clamp and the cover.

[0009] In the above scheme, the first clamping plate and the second clamping plate are both slidably arranged on the guide part, so that the first clamping plate and the second clamping plate can be easily adjusted in position, so that the first clamping plate and the second clamping plate can clamp and position the two sides of the battery cell in the thickness direction respectively. The first clamping plate and the second clamping plate both play a role of clamping the battery cell, and the relative position of the battery cell and the clamping plate assembly is kept unchanged during the electrical performance test, thereby improving the accuracy of the data during the battery test.

[0010] According to some embodiments of the present application, the first clamping plate and the second clamping plate both have a first surface close to one side of the battery cell, and the first surface is a plane.

[0011] In the above scheme, the surfaces of the first clamping plate and the second clamping plate in contact with the battery cell are planes, which are in contact with the surface of the battery cell, eliminating the influence of local stress caused by the uneven surface of the clamping plate and ensuring the uniformity of force transmission during battery testing.

[0012] According to some embodiments of the present application, the middle part of the disc spring has a center hole, the second clamping plate has a second surface facing away from the first surface, and a positioning portion is protruded from the middle part of the second surface. The positioning portion is used for the center hole of the disc spring to be mounted to limit the movement of the disc spring on the surface where the second surface is located.

[0013] In the above scheme, a positioning part is provided on the second surface of the second clamping plate, and the positioning part is used for the disc spring to be sleeved on the second clamping plate, so as to play the role of initial positioning for the disc spring, facilitate the rapid assembly of the disc spring, and reduce the assembly difficulty of the disc spring. The positioning part cooperates with the disc spring, and the positioning part can limit the movement of the disc spring on the surface where the second surface is located, so that the disc spring is always in the center position of the second clamping plate, and the disc spring is prevented from being offset during the clamping process of the battery test fixture.

[0014] According to some embodiments of the present application, the center hole of the disc spring is clearance-matched with the positioning portion.

[0015] In the above scheme, through the clearance fit between the center hole and the positioning portion, when the battery cell is deformed, friction is not easily generated between the disc spring and the positioning portion of the second clamping plate during the relative movement of the second clamping plate along the first direction, thereby reducing the probability of introducing friction and improving the accuracy of the battery cell test.

[0016] According to some embodiments of the present application, the cover plate has an avoidance groove for avoiding the positioning portion.

[0017] In the above scheme, in order to reduce the probability of interference between the cover plate and the positioning part without affecting the positioning effect between the positioning part and the disc spring, an avoidance groove is provided on the cover plate, and the avoidance groove can accommodate at least part of the positioning part. In this way, the positioning part can have a certain height to meet the positioning requirements of the positioning part and the disc spring, and the phenomenon of the cover plate acting on the positioning part during the process of the cover plate pressing down the disc spring can be avoided.

[0018] According to some embodiments of the present application, the guide portion includes a plurality of guide columns, and the plurality of guide columns are spaced apart and distributed around the circumference of the base, and the first clamping plate and the second clamping plate both have guide holes for the guide columns to pass through.

[0019] In the above scheme, the guiding part is adopted as a plurality of guide columns, and the first clamp plate and the second clamp plate are both cooperated with the plurality of guide columns. Under the joint guiding action of the plurality of guide columns, the first clamp plate and the second clamp plate can only move along the extension direction of the guide columns, thereby improving the stability of the sliding process of the first clamp plate and the second clamp plate.

[0020] According to some embodiments of the present application, the guide column and the guide hole are loosely matched.

[0021] In the above scheme, there is a gap between the guide column and the guide hole, so that the first clamping plate and the second clamping plate can slide relatively smoothly along the extension direction of the guide column, and when the first clamping plate and the second clamping plate slide on the guide column, the friction force with the guide column is small, which reduces the influence of friction on the battery cell testing process and improves the accuracy of the battery cell testing results.

[0022] According to some embodiments of the present application, the cover plate has a first mounting hole for the guide column to pass through, and the cover plate is sleeved on the guide column through the first mounting hole; the first fastener is threadedly connected to the guide column.

[0023] In the above scheme, the cover plate is sleeved on the guide column through the first mounting hole. Under the locking action of the first fastener, the first fastener clamps and fixes the cover plate, disc spring, clamping plate assembly and base together to achieve the clamping and fixation of the battery test fixture. By adjusting the rotation amount of the first fastener, the clamping force of the battery cell can be easily adjusted, and the pressure can be adjusted to the preload force requirement of the battery cell test, thereby meeting the test requirements of the battery cell. The pressure adjustment is convenient and fast, and the structure is simple.

[0024] According to some embodiments of the present application, the battery testing fixture also includes a connecting column and a second fastener, the connecting column is arranged on the base and is located between two adjacent guide columns, and the cover plate has a second mounting hole for the connecting column to pass through; the second fastener is threadedly connected to the connecting column, and the second fastener is used to limit the movement of the cover plate along the side away from the base.

[0025] In the above scheme, in order to ensure the fastening effect of the cover plate and reduce the probability of the cover plate moving when subjected to the reaction force of the disc spring, a connecting column is provided on the base, the connecting column passes through the second mounting hole of the cover plate, and then is threadedly connected to the connecting column through the second fastener. Under the joint fastening action of the first fastener and the second fastener, the cover plate is locked and fixed. Compared with the fastening by the first fastener alone, the fastening effect of the cover plate is better, ensuring that the position of the cover plate will not change during the battery cell test. In addition, the first fastener and the second fastener have different force transmission points for applying the fastening force to the cover plate, so the fastening force transmitted to the cover plate is more uniform.

[0026] According to some embodiments of the present application, both the first clamping plate and the second clamping plate have a clearance hole for avoiding the connecting column.

[0027] In the above scheme, the first clamp plate and the second clamp plate are provided with clearance holes for avoiding the connecting column, and there is no matching and connecting relationship between the connecting column and the first clamp plate and the second clamp plate, so that the first clamp plate and the second clamp plate will not slide or contact with the connecting column, thereby reducing the influence of external force on the battery cell test and improving the accuracy of the battery cell test.

[0028] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a battery test fixture according to some embodiments of the present application;

[0031] Figure 2 This is a schematic diagram of the structure of the battery test fixture after the cover plate is removed in some embodiments of the present application;

[0032] Figure 3 A front view of a battery test fixture according to some embodiments of the present application;

[0033] Figure 4 A schematic diagram of local parameters of a disc spring in a battery test fixture in some embodiments of the present application;

[0034] Figure 5 Schematic diagram of the stiffness curve of the disc spring in the battery testing fixture of some embodiments of the present application.

[0035] Icons: 100-battery test fixture; 10-base; 11-guide part; 110-guide column; 20-pressure test component; 30-clamp assembly; 31-first clamp; 32-second clamp; 321-second surface; 322-positioning part; 33-first surface; 34-clearance hole; 40-disc spring; 41-center hole; 50-cover assembly; 51-cover; 511-first mounting hole; 512-second mounting hole; 52-first fastener; 60-connecting column; 61-second fastener; 200-battery cell; X-first direction. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0038] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0041] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0042] In the present application, the battery may include a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the embodiments of the present application. The battery may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiments of the present application.

[0043] At present, all-solid-state batteries have no electrolyte, so electrons and ions need to be transferred through contact between particles. During the charging and discharging process of all-solid-state battery cells, the battery cells themselves have inevitable volume deformation. Under the constraints of limited external space, the volume deformation problem is converted into the force of battery expansion on the external structure. When the force acts on conventional fixtures, the fixtures will be displaced, and it is difficult for the fixtures to continuously apply constant pressure to the battery cells.

[0044] When the pressure applied by the fixture to the battery cell changes, the contact relationship between the particles will also change accordingly. Since solid-state battery cells need to transfer electrons and ions through particle contact, this will affect the electrical performance of the battery cell. In the process of electrical performance testing of solid-state battery cells by existing conventional fixtures, the battery cell is generally clamped at a constant pressure through a hydraulic system, but there are problems such as large equipment, complex structure, and high cost, which are not suitable for mass use.

[0045] In view of this, in order to solve the problem that the pressure during the testing of all-solid-state battery cells cannot be kept relatively constant, some embodiments of the present application provide a battery testing fixture, which includes a base, a clamping plate assembly, a pressure testing component, a cover plate assembly and a disc spring, the base is provided with a guide portion extending along a first direction; the clamping plate assembly is slidably provided with a guide portion along the first direction, and the clamping plate assembly is used to clamp the battery cell; the pressure testing component is arranged between the base and the clamping plate assembly, the cover plate assembly includes a cover plate and a first fastener, the cover plate is slidably provided on the guide portion, and is located on the side of the clamping plate assembly away from the base, the first fastener is connected to the guide portion, and is used to limit the cover plate from moving along the side away from the base, and the first fastener applies pressure to the clamping plate assembly through the cover plate; the disc spring is arranged between the cover plate and the clamping plate assembly, the compression stroke of the disc spring is h0, the plate thickness of the disc spring is t, and h0 / t satisfies: 1.4-1.45.

[0046] In such a battery test fixture, the volume of the battery cell will change due to the expansion or contraction of the powder of the all-solid-state battery cell. Through the setting of the disc spring, the disc spring h0 / t satisfies: 1.4-1.45, so that the disc spring has a zero stiffness characteristic. Even after the all-solid-state battery cell expands or contracts, the clamp assembly moves along the guide portion, so that the compression of the disc spring increases or decreases. According to the zero stiffness characteristic of the disc spring, the compression (strain) of the disc spring changes within the preset compression strain range of the disc spring. The pressure change of the disc spring is very small or tends to be constant, so that the pressure transmitted by the disc spring to the all-solid-state battery cell is relatively constant. During the deformation of the battery cell, the disc spring provides the battery cell with a pressure compensation effect. Compared with the conventional fixture in the prior art that maintains constant pressure through a hydraulic system, the setting of the disc spring can provide a pressure compensation effect to the battery cell, so that the electrical properties of the all-solid-state battery cell can be fully exerted, and the fixture has a simple structure and a small volume, which is conducive to batch use.

[0047] The present application embodiment provides a battery testing fixture, please refer to Figures 1 to 3 , Figure 1 A schematic diagram of the structure of a battery test fixture according to some embodiments of the present application; Figure 2 This is a schematic diagram of the structure of the battery test fixture after the cover plate is removed in some embodiments of the present application; Figure 3 This is a front view of a battery test fixture according to some embodiments of the present application. The battery test fixture 100 includes a base 10, a clamping plate assembly 30, a pressure test component 20, a cover plate assembly 50 and a disc spring 40. The base 10 is provided with a guide portion 11 extending along a first direction X; the clamping plate assembly 30 is slidably provided with the guide portion 11 along the first direction X, and the clamping plate assembly 30 is used to clamp the battery cell 200; the pressure test component 20 is arranged between the base 10 and the clamping plate assembly 30, and the cover plate assembly 50 includes a cover plate 51 and a first fastener 52. The cover plate 51 is slidably provided on the guide portion 11 and is located on a side of the clamping plate assembly 30 away from the base 10. The first fastener 52 is connected to the guide portion 11 and is used to limit the cover plate 51 from moving along the side away from the base 10. The first fastener 52 applies pressure to the clamping plate assembly 30 through the cover plate 51; the disc spring 40 is arranged between the cover plate 51 and the clamping plate assembly 30, the compression stroke of the disc spring 40 is h0, and the plate thickness of the disc spring 40 is t. h0 / t satisfies: 1.4-1.45.

[0048] The base 10 is a bearing component for mounting the pressure test component 20 and the guide portion 11, and the base 10 may be a plate structure. The guide portion 11 is a guide portion 11 that provides a guiding function for the clamping plate assembly 30 and the cover plate 51, so that the clamping plate assembly 30 and the cover plate 51 can slide along the guide portion 11.

[0049] The cover plate 51 refers to a cover structure disposed at one end of the guide portion 11 away from the base 10. The first fastener 52 is connected to the guide portion 11 to lock and fix the cover plate 51 at the far end of the guide portion 11. The first fastener 52 applies a fastening force to the cover plate 51, and the cover plate 51 applies pressure to the battery cell 200 in the clamping plate assembly 30 through the disc spring 40. Due to the principle of action and reaction force, it can also be understood that the cover plate 51 and the base 10 are clamped and matched, and are clamped on both sides of the thickness direction of the clamping plate assembly 30 to apply pressure to the battery cell 200 in the clamping plate assembly 30. The base 10 is in a stationary position, the cover plate 51 is in an adjustable position, and the position of the cover plate 51 and the locking force on the cover plate 51 are adjusted by the first fastener 52, and the compression amount of the disc spring 40 changes accordingly, which plays a role in adjusting the pre-tightening force of the battery cell 200.

[0050] The pressure test component 20 may be a pressure sensor for detecting the magnitude of force. The pressure test component 20 is connected to a test device, which can calculate and display the relative relationship between pressure change and time to confirm whether the compensation effect of the disc spring 40 during the charge and discharge test of the battery cell 200 meets the requirements. The test device is a prior art and will not be described in detail here.

[0051] It can be understood that the disc spring 40 is a butterfly spring. Figure 5 The zero stiffness characteristic of the disc spring 40 means that the disc spring 40 is within a certain compression strain range under a specific pressure, that is, after the disc spring 40 is within this range, even if a certain amount of compression changes in the disc spring 40, the change in the pressure of the disc spring 40 is small and tends to remain unchanged. Moreover, this compression curve is reversible. When the disc spring 40 is gradually unloaded, the pressure-strain change relationship curve is basically consistent with the compression curve. Figure 5 The L section shown in the figure is the zero stiffness characteristic section of the disc spring 40 mentioned above. When the compression amount of the disc spring 40 is within the strain range of this section, the compression amount of the disc spring 40 changes, and the compression force of the disc spring 40 remains almost unchanged. Through the zero stiffness characteristic of the disc spring 40, the disc spring 40 can absorb the deformation of the battery cell 200 and provide pressure compensation for the battery cell 200.

[0052] The zero stiffness characteristic of the disc spring 40 may be based on the National Standard of the People's Republic of China GBT 1972-2005.

[0053] Taking the preload requirement of the battery cell 200 as 2Mpa as an example, the specific size and parameters of the disc spring 40 can be designed. The preload requirement of the battery cell 200 can be met by changing the size of the disc spring 40, the compression stroke h0 of the disc spring 40, and the plate thickness t of the disc spring 40, that is, the zero stiffness characteristic section of the disc spring 40 appears at 2Mpa.

[0054] Of course, in addition to designing the size parameters of a single disc spring 40, if the pressure of a single disc spring 40 does not meet the preset pressure of the battery cell 200, multiple disc springs 40 can be stacked in series. For example, if the preload force requirement of the battery cell 200 is 6Mpa, three disc springs 40 can be stacked in series. Figure 2 The figure shows the case where three disc springs are stacked.

[0055] In this solution, the battery cell 200 is an all-solid-state battery cell, and a guide portion 11 is provided on the base 10. The clamping plate assembly 30 and the cover plate 51 can be slidably provided on the guide portion 11. After the clamping plate assembly 30 clamps the battery cell 200, the clamping plate assembly 30 contacts the pressure test component 20, and the disc spring 40 is provided between the clamping plate assembly 30 and the cover plate 51. After the cover plate 51 is locked by the first fastener 52, the clamping and fixing of the battery test fixture is completed. The first fastener 52 applies a locking force to the cover plate 51, and transmits force to the battery cell 200 in the clamping plate assembly 30 through the disc spring 40. The pressure test component 20 realizes pressure detection of the battery cell 200 during the charging and discharging process. During the charging and discharging test of the all-solid-state battery cell 200, the volume of the battery cell 200 will change due to the expansion or contraction of the powder of the all-solid-state battery cell 200. Through the setting of the disc spring 40, the disc spring h0 / t satisfies: 1.4-1.45, so that the disc spring 40 has a zero stiffness characteristic. Even after the all-solid-state battery cell 200 expands or contracts, the clamp assembly 30 moves along the guide portion 11, so that the compression of the disc spring 40 increases or decreases. According to the zero stiffness characteristic of the disc spring 40, the compression (strain) of the disc spring 40 changes within the preset compression strain range of the disc spring 40, and the pressure of the disc spring 40 changes very little or tends to remain unchanged, so that the pressure transmitted by the disc spring 40 to the all-solid-state battery cell 200 is relatively constant. During the deformation of the battery cell 200, the disc spring 40 provides the battery cell 200 with a pressure compensation effect. Compared with the conventional clamp in the prior art that maintains constant pressure through a hydraulic system, the setting of the disc spring 40 can provide a pressure compensation effect for the battery cell 200, so that the electrical properties of the all-solid-state battery cell 200 can be fully exerted, and the clamp has a simple structure and a small size, which is conducive to batch use.

[0056] According to some embodiments of this application, please refer to Figures 1 to 3 The clamping plate assembly 30 includes a first clamping plate 31 and a second clamping plate 32. The first clamping plate 31 and the second clamping plate 32 are both slidably arranged on the guide portion 11 along the first direction X. The first clamping plate 31 and the second clamping plate 32 are used to clamp the battery cell 200; the first clamping plate 31 is closer to the base 10 than the second clamping plate 32, the pressure test component 20 is arranged between the base 10 and the first clamping plate 31, and the disc spring 40 is arranged between the second clamping plate 32 and the cover plate 51.

[0057] The first clamping plate 31 and the second clamping plate 32 may both be plate structures, and the first clamping plate 31 and the second clamping plate 32 are used to clamp two sides of the battery cell 200 in the thickness direction.

[0058] The first clamping plate 31 and the second clamping plate 32 can be slidably arranged on the guide part 11, so that the first clamping plate 31 and the second clamping plate 32 can be easily adjusted in position, so that the first clamping plate 31 and the second clamping plate 32 can clamp and position the two sides of the battery cell 200 in the thickness direction. The first clamping plate 31 and the second clamping plate 32 can clamp the battery cell 200, and the relative position between the battery cell 200 and the clamping plate assembly 30 is kept unchanged during the electrical performance test, thereby improving the accuracy of the data during the battery test.

[0059] According to some embodiments of the present application, the first clamping plate 31 and the second clamping plate 32 both have a first surface 33 close to one side of the battery cell 200 , and the first surface 33 is a plane.

[0060] The first surface 33 refers to a surface of the first clamping plate 31 and the second clamping plate 32 in the thickness direction close to the solid-state battery cell 200 .

[0061] The surfaces of the first clamping plate 31 and the second clamping plate 32 contacting the battery cell 200 are planes, which contact the surfaces of the battery cell 200, eliminating the influence of local stress caused by the uneven surfaces of the clamping plates and ensuring uniform force transmission during battery testing.

[0062] According to some embodiments of the present application, the disc spring 40 has a center hole 41 in the middle, the second clamping plate 32 has a second surface 321 facing away from the first surface 33, and a positioning portion 322 is protruded from the middle position of the second surface 321. The positioning portion 322 is used for the center hole 41 of the disc spring 40 to be mounted so as to limit the movement of the disc spring 40 on the surface where the second surface 321 is located.

[0063] The center hole 41 of the disc spring 40 refers to a through hole structure opened in the middle of the disc spring 40, and the center hole 41 is located in the middle of the disc spring 40. The hole shape of the center hole 41 can be circular.

[0064] The positioning portion 322 refers to a boss structure protruding from the second surface 321 of the second clamping plate 32. The positioning portion 322 is arranged in the middle position of the second clamping plate 32. The size of the positioning portion 322 is smaller than the size of the center hole 41 of the disc spring 40 so that the disc spring 40 can be inserted and arranged.

[0065] The cross-sectional shape of the positioning portion 322 may be circular, square, or triangular, etc. Optionally, the cross-sectional shape of the positioning portion 322 is circular.

[0066] The height of the positioning portion 322 is smaller than the thickness of the disc spring 40, so as to avoid the situation where, when the disc spring 40 is compressed and deformed by the cover plate 51, the height of the disc spring 40 becomes lower than the height of the positioning portion 322, resulting in the positioning portion 322 contacting the cover plate 51 instead of the disc spring 40.

[0067] The second surface 321 of the second clamping plate 32 is provided with a positioning portion 322, and the positioning portion 322 allows the disc spring 40 to be sleeved on the second clamping plate 32, and plays a role in initial positioning of the disc spring 40, which facilitates the rapid assembly of the disc spring 40 and reduces the assembly difficulty of the disc spring 40. The positioning portion 322 cooperates with the disc spring 40, and the positioning portion 322 can limit the movement of the disc spring 40 on the surface where the second surface 321 is located, so that the disc spring 40 is always in the center position of the second clamping plate 32, and the disc spring 40 is prevented from being offset during the clamping process of the battery test fixture.

[0068] According to some embodiments of the present application, the center hole 41 of the disc spring 40 is clearance-matched with the positioning portion 322 .

[0069] Clearance fit means that there is a gap between the outer peripheral wall of the positioning portion 322 and the inner wall of the center hole 41 of the disc spring 40.

[0070] Through the clearance fit between the center hole 41 and the positioning portion 322, when the battery cell 200 is deformed, friction is not easily generated between the disc spring 40 and the positioning portion 322 of the second clamping plate 32 during relative movement along the first direction X, thereby reducing the probability of introducing friction and improving the accuracy of the battery cell 200 test.

[0071] According to some embodiments of the present application, the cover plate 51 has an avoidance groove for avoiding the positioning portion 322 .

[0072] The avoidance groove refers to a groove structure on the cover plate 51 that provides a clearance function for the positioning portion 322. The shape of the avoidance groove is adapted to the shape of the positioning portion 322, and the size of the avoidance groove is larger than the size of the positioning portion 322.

[0073] In order to reduce the probability of interference between the cover plate 51 and the positioning portion 322 without affecting the positioning effect between the positioning portion 322 and the disc spring 40, an avoidance groove is provided on the cover plate 51, and the avoidance groove can accommodate at least a part of the positioning portion 322. In this way, the positioning portion 322 can have a certain height to meet the positioning requirements of the positioning portion 322 and the disc spring 40, and the phenomenon of the cover plate 51 acting on the positioning portion 322 can be avoided when the cover plate 51 presses down the disc spring 40.

[0074] According to some embodiments of the present application, the guide portion 11 includes a plurality of guide posts 110 , which are spaced apart and distributed around the base 10 , and the first clamping plate 31 and the second clamping plate 32 both have guide holes for the guide posts 110 to pass through.

[0075] The number of the guide posts 110 may be two, three, or four, etc. The number of the guide posts 110 may be determined according to actual conditions.

[0076] Optionally, the number of the guide posts 110 is four, and the four guide posts 110 are distributed at four corners of the base 10 .

[0077] The cross-sectional shape of the guide post 110 can be circular, square or triangular, etc. Optionally, the cross-sectional shape of the guide post 110 is circular. The circular guide post 110 makes the first clamping plate 31 and the second clamping plate 32 smoother during the sliding process.

[0078] However, the present invention is not limited thereto. In addition to the structure of the guide column 110, the guide portion 11 may also be other guide structures. For example, the guide portion 11 may also be two guide plates, which are respectively arranged on opposite sides of the base 10, and the first clamping plate 31 and the second clamping plate 32 are slidably matched with the two guide plates. Of course, bolts may be processed on the top of the guide plate to facilitate connection with the bolts through the first fastener 52 to achieve locking and fixing of the cover plate 51.

[0079] The guide portion 11 is formed of a plurality of guide posts 110, and the first clamp plate 31 and the second clamp plate 32 are both matched with the plurality of guide posts 110. Under the joint guiding action of the plurality of guide posts 110, the first clamp plate 31 and the second clamp plate 32 can only move along the extension direction of the guide posts 110, thereby improving the stability of the sliding process of the first clamp plate 31 and the second clamp plate 32.

[0080] According to some embodiments of the present application, the guide column 110 is loosely matched with the guide hole.

[0081] The clearance fit means that there is a gap between the outer peripheral wall of the guide column 110 and the inner wall of the guide hole, which facilitates the first clamping plate 31 and the second clamping plate 32 to slide smoothly along the first direction X on the guide column 110 .

[0082] There is a gap between the guide column 110 and the guide hole, so that the first clamp plate 31 and the second clamp plate 32 can slide relatively smoothly along the extension direction of the guide column 110, and when the first clamp plate 31 and the second clamp plate 32 slide on the guide column 110, the friction force with the guide column 110 is small, which reduces the influence of friction on the test process of the battery cell 200 and improves the accuracy of the test results of the battery cell 200.

[0083] According to some embodiments of the present application, the cover plate 51 has a first mounting hole 511 for the guide column 110 to pass through, and the cover plate 51 is sleeved on the guide column 110 through the first mounting hole 511 ; the first fastener 52 is threadedly connected to the guide column 110 .

[0084] The first fastener 52 can be a nut, which is threadedly connected to the guide column 110. The first fastener 52 fastens the cover plate 51. By adjusting the locking force of the first fastener 52, the locking force on the cover plate 51 can be adjusted, and the pressure of the cover plate 51 on the disc spring 40 can be correspondingly adjusted to meet the clamping force requirements of the battery cell 200.

[0085] The first mounting hole 511 is a countersunk hole, that is, a stepped hole. After the first fastener 52 is threadedly connected to the guide column 110, the first fastener 52 is continuously rotated, and the first fastener 52 acts on the cover plate 51, so that the cover plate 51 moves along the guide column 110 toward the side of the battery cell 200, and transmits force through the disc spring 40, thereby increasing the pressure on the battery cell 200, until the pressure monitored by the pressure test component 20 reaches the preset force value.

[0086] The fastening force of the first fastener 52 is sequentially transmitted to the disc spring 40, the second clamping plate 32 and the battery cell 200 through the cover plate 51. Similarly, due to the principle of action and reaction, the pressure applied to the battery cell 200 is transmitted to the disc spring 40 and the cover plate 51 through the second clamping plate 32 to form a force transmission path.

[0087] The cover plate 51 is sleeved on the guide column 110 through the first mounting hole 511. Under the locking action of the first fastener 52, the first fastener 52 clamps and fixes the cover plate 51, the disc spring 40, the clamping plate assembly 30 and the base 10 together, thereby clamping and fixing the battery test fixture 100. By adjusting the rotation amount of the first fastener 52, the clamping force of the battery cell 200 can be easily adjusted, and the pressure can be adjusted to the preload force requirement of the battery cell 200 test, thereby meeting the test requirements of the battery cell 200. The pressure adjustment is convenient and fast, and the structure is simple.

[0088] According to some embodiments of the present application, the battery testing fixture 100 also includes a connecting column 60 and a second fastener 61, the connecting column 60 is arranged on the base 10 and is located between two adjacent guide columns 110, and the cover plate 51 has a second mounting hole 512 for the connecting column 60 to pass through; the second fastener 61 is threadedly connected to the connecting column 60, and the second fastener 61 is used to limit the cover plate 51 from moving along the side away from the base 10.

[0089] The number of the connecting posts 60 may be one or more. When the number of the connecting posts 60 is more than one, the connecting posts 60 are spaced apart and distributed between two adjacent guide posts 110 .

[0090] Optionally, the number of the connecting posts 60 is four, and the four connecting posts 60 can be divided into two groups of connecting posts 60 on the left and right, each group of connecting posts 60 can include two connecting posts 60, and the two groups of connecting posts 60 are respectively located on opposite sides of the base 10 and between two adjacent guide posts 110. By providing a plurality of connecting posts 60, the second fastener 61 is tightly matched with the connecting posts 60, and the fastening and limiting effects on the cover plate 51 are better.

[0091] The second fastener 61 is a nut, and the second fastener 61 is threadedly connected to the end of the connecting column 60 away from the base 10 to fasten the cover plate 51. By adjusting the rotation amount of the second fastener 61, the pressure of the cover plate 51 on the disc spring 40 can be adjusted.

[0092] The second mounting hole 512 is a countersunk hole, that is, a stepped hole. After the second fastener 61 is threadedly connected to the connecting column 60, the second fastener 61 is continuously rotated, and the second fastener 61 and the first fastener 52 act together on the cover plate 51, so that the cover plate 51 moves along the connecting column 60 and the guide column 110 toward the side close to the battery cell 200, and transmits force through the disc spring 40 to adjust the pre-tightening force on the battery cell 200 until the pressure monitored by the pressure test component 20 reaches the set force value.

[0093] In order to ensure the fastening effect of the cover plate 51 and reduce the probability of the cover plate 51 moving when subjected to the reaction force of the disc spring 40, a connecting column 60 is provided on the base 10, and the connecting column 60 passes through the second mounting hole 512 of the cover plate 51, and then is threadedly connected to the connecting column 60 through the second fastener 61. Under the joint fastening action of the first fastener 52 and the second fastener 61, the cover plate 51 is locked and fixed. Compared with the fastening by the first fastener 52 alone, the fastening effect of the cover plate 51 is better, ensuring that the position of the cover plate 51 will not change during the test of the battery cell 200. In addition, the first fastener 52 and the second fastener 61 have different force transmission points for applying the fastening force to the cover plate 51, so the fastening force transmitted to the cover plate 51 is more uniform.

[0094] According to some embodiments of the present application, both the first clamping plate 31 and the second clamping plate 32 have a clearance hole 34 for avoiding the connecting column 60 .

[0095] The clearance hole 34 refers to a gap opened on the first splint 31 and the second splint 32 corresponding to the position of the connecting column 60. The gap can be used for the connecting column 60 to pass through and provide a clearance function for the connecting column 60. There is no connection relationship between the first splint 31 and the second splint 32 and the connecting column 60.

[0096] By providing the first clamping plate 31 and the second clamping plate 32 with the clearance holes 34 for avoiding the connecting column 60, there is no matching and connecting relationship between the connecting column 60 and the first clamping plate 31 and the second clamping plate 32, so that the first clamping plate 31 and the second clamping plate 32 will not slide or contact with the connecting column 60, thereby reducing the influence of external force on the test of the battery cell 200 and improving the accuracy of the test of the battery cell 200.

[0097] The following is an explanation of the disc spring design process:

[0098] Please refer to Figure 4 and Figure 5 The elastic modulus of the disc spring is 206GPa, and the Poisson's ratio is 0.3. The disc spring is made of 60Si2MnA and 50CrVA. According to the size of the battery cell 100 mm*100 mm, the initial size of the disc spring D can be designed to be 100mm±20mm; the ratio of D / d is generally 1.7-2, and D / d is taken as 2, which determines the size of d to be 50mm±10mm.

[0099] In order to make the designed disc spring have zero stiffness characteristics, the zero stiffness characteristics of the disc spring can be seen Figure 5 In the stiffness curve, the disc spring has a small change in pressure and tends to remain unchanged in a certain compression strain range, and this compression curve is reversible. When the disc spring is gradually unloaded, the pressure-strain change relationship curve is basically consistent with the compression curve. This can have a pressure compensation effect on the all-solid-state battery cell, eliminate the influence of stress relaxation of the buffer gasket, and set the ratio of h0 / t to 1.4.

[0100] h0 is the compression stroke of the disc spring. Under the condition that the compression stroke meets the pressure requirements, the smaller the stroke, the smaller the overall size of the fixture. The initial plate thickness t of a disc spring can be given as 5mm, and then the value of h0 is 7mm. Therefore, the size of the entire disc spring has been designed, and the next step is to check whether the pressure meets the requirements and whether the strength meets the requirements.

[0101] Check the stiffness curve of the disc spring, calculate the pressure values ​​under different compression amounts according to the disc spring size, and thus obtain the stiffness curve of the disc spring.

[0102]

[0103] At the same time, according to the size of the all-solid-state battery cell of 100mm*100mm, combined with the preload requirement of 2MPa, it is calculated that F is about 20000N. Extract the F of the platform part of the stiffness curve calculated previously, and compare it with the pressure required by the battery cell. If the pressure of the platform part of the disc spring stiffness curve is greater than the force required by the battery cell, the thickness of the disc spring needs to be adjusted appropriately. If the pressure of the platform part of the disc spring stiffness curve is less than the force required by the battery cell, the thickness of the disc spring can be increased. Adjust until the pressure required by the battery cell is equal to the pressure of the platform of the disc spring stiffness curve. Then proceed to the next step of checking the strength of the disc spring.

[0104] The strength of the disc spring is checked by solving the stress of the four corners of the disc spring according to the following formula. f is the compression amount. Substitute the maximum compression amount of the disc spring platform part into the solution to obtain the maximum stress result of the disc spring and compare it with the strength of the material. If the strength requirements are met, a single disc spring meets the requirements. If the strength requirements are not met, multiple disc springs can be stacked in series. For series disc springs, the pressure borne by each disc spring is only 1 / n of that of the disc springs.

[0105]

[0106] In some embodiments, the battery test fixture 100 includes a base 10, a clamping plate assembly 30, a pressure test component 20, a cover plate assembly 50 and a disc spring 40, the base 10 is provided with a guide portion 11 extending along a first direction X; the clamping plate assembly 30 is slidably provided with the guide portion 11 along the first direction X, the clamping plate assembly 30 is used to clamp the battery cell 200, the clamping plate assembly 30 includes a first clamping plate 31 and a second clamping plate 32, the first clamping plate 31 and the second clamping plate 32 are both slidably provided on the guide portion 11 along the first direction X. Part 11, the first clamping plate 31 and the second clamping plate 32 are used to clamp the battery cell 200, the first clamping plate 31 and the second clamping plate 32 both have a first surface 33 close to the side of the battery cell 200, and the first surface 33 is a plane; the first clamping plate 31 is closer to the base 10 than the second clamping plate 32, the pressure test component 20 is arranged between the base 10 and the first clamping plate 31, the disc spring 40 is arranged between the second clamping plate 32 and the cover plate 51, the compression stroke of the disc spring 40 is h0, the plate thickness of the disc spring 40 is t, h0 / t satisfies: 1.4-1.45; the cover plate assembly 50 includes a cover plate 51 and a first fastener 52, the cover plate 51 is slidably arranged on the guide part 11, and is located on the side of the clamping plate assembly 30 away from the base 10, the first fastener 52 is connected to the guide part 11, and is used to limit the cover plate 51 from moving along the side away from the base 10, and the first fastener 52 applies pressure to the clamping plate assembly 30 through the cover plate 51.

[0107] During the charge and discharge test of the all-solid-state battery cell 200, the volume of the battery cell 200 will change due to the expansion or contraction of the powder of the all-solid-state battery cell 200. Through the setting of the disc spring 40, the disc spring 40h0 / t satisfies: 1.4-1.45, so that the disc spring 40 has a zero stiffness characteristic. Even after the all-solid-state battery cell 200 is expanded or contracted, the clamping plate assembly 30 moves along the guide portion 11, so that the compression amount of the disc spring 40 increases or decreases. According to the zero stiffness characteristic of the disc spring 40, the compression amount (strain amount) of the disc spring 40 changes within the preset compression strain range of the disc spring 40, and the pressure change of the disc spring 40 is very small or tends to be unchanged, so that the pressure transmitted by the disc spring 40 to the all-solid-state battery cell 200 is relatively constant. During the deformation of the battery cell 200, the disc spring 40 provides a pressure compensation effect to the battery cell 200. Compared with the conventional clamp in the prior art that uses a hydraulic system to maintain constant pressure, the disc spring 40 can provide pressure compensation for the battery cell 200, so that the electrical properties of the all-solid-state battery cell 200 can be fully exerted, and the clamp has a simple structure and a small volume, which is conducive to batch use. The surfaces of the first clamp 31 and the second clamp 32 that contact the battery cell 200 are planes, and the planes are in contact with the surface of the battery cell 200, eliminating the influence of local stress caused by the uneven surface of the clamps, and ensuring the uniformity of force transmission during battery testing.

[0108] In some embodiments, the disc spring 40 has a center hole 41 in the middle, the second clamping plate 32 has a second surface 321 facing away from the first surface 33, and a positioning portion 322 is protruded from the middle of the second surface 321. The positioning portion 322 is used for the center hole 41 of the disc spring 40 to be mounted to limit the movement of the disc spring 40 on the surface where the second surface 321 is located. The center hole 41 of the disc spring 40 is clearance-matched with the positioning portion 322, and the cover plate 51 has an avoidance groove for avoiding the positioning portion 322.

[0109] By providing a positioning portion 322 on the second surface 321 of the second clamping plate 32, the positioning portion 322 allows the disc spring 40 to be sleeved on the second clamping plate 32, plays the role of initial positioning for the disc spring 40, facilitates the rapid assembly of the disc spring 40, and reduces the difficulty of assembling the disc spring 40. The positioning portion 322 cooperates with the disc spring 40, and the positioning portion 322 can limit the movement of the disc spring 40 on the surface where the second surface 321 is located, so that the disc spring 40 is always in the center position of the second clamping plate 32, and avoids the disc spring 40 from being offset during the clamping process of the battery test fixture. Through the clearance fit between the center hole 41 and the positioning portion 322, when the battery cell 200 is deformed, during the relative movement of the second clamping plate 32 along the first direction X, it is not easy to generate friction between the disc spring 40 and the positioning portion 322 of the second clamping plate 32, which reduces the probability of introducing friction and improves the accuracy of the battery cell 200 test. In order to reduce the probability of interference between the cover plate 51 and the positioning portion 322 without affecting the positioning effect between the positioning portion 322 and the disc spring 40, an avoidance groove is provided on the cover plate 51, and the avoidance groove can accommodate at least a part of the positioning portion 322. In this way, the positioning portion 322 can have a certain height to meet the positioning requirements of the positioning portion 322 and the disc spring 40, and the phenomenon of the cover plate 51 acting on the positioning portion 322 can be avoided when the cover plate 51 presses down the disc spring 40.

[0110] In some embodiments, the guide portion 11 includes a plurality of guide posts 110, which are spaced apart and distributed around the base 10. The first clamping plate 31 and the second clamping plate 32 both have guide holes for the guide posts 110 to pass through, and the guide posts 110 are clearance-matched with the guide holes. The cover plate 51 has a first mounting hole 511 for the guide posts 110 to pass through, and the cover plate 51 is sleeved on the guide posts 110 through the first mounting hole 511; the first fastener 52 is threadedly connected to the guide posts 110.

[0111] The first clamping plate 31 and the second clamping plate 32 are both matched with the plurality of guide posts 110. Under the common guiding action of the plurality of guide posts 110, the first clamping plate 31 and the second clamping plate 32 can only move along the extension direction of the guide posts 110, thereby improving the stability of the sliding process of the first clamping plate 31 and the second clamping plate 32. There is a gap between the guide posts 110 and the guide holes, so that the first clamping plate 31 and the second clamping plate 32 can slide relatively smoothly along the extension direction of the guide posts 110, and when the first clamping plate 31 and the second clamping plate 32 slide on the guide posts 110, the friction force with the guide posts 110 is small, thereby reducing the influence of the friction force on the test process of the battery cell 200 and improving the accuracy of the test results of the battery cell 200. The cover plate 51 is sleeved on the guide post 110 through the first mounting hole 511. Under the locking action of the first fastener 52, the first fastener 52 clamps and fixes the cover plate 51, the disc spring 40, the clamping plate assembly 30 and the base 10 together, thereby realizing the clamping and fixing of the battery test fixture. By adjusting the rotation amount of the first fastener 52, the clamping force of the battery cell 200 can be easily adjusted, and the pressure can be adjusted to the preload force requirement of the battery cell 200 test, thereby meeting the test requirements of the battery cell 200. The pressure adjustment is convenient and fast, and the structure is simple.

[0112] In some embodiments, the battery testing fixture also includes a connecting column 60 and a second fastener 61, the connecting column 60 is arranged on the base 10 and is located between two adjacent guide columns 110, and the cover plate 51 has a second mounting hole 512 for the connecting column 60 to pass through; the second fastener 61 is threadedly connected to the connecting column 60, and the second fastener 61 cooperates with the first fastener 52 to limit the cover plate 51 from moving along the side away from the base 10, and the first clamp plate 31 and the second clamp plate 32 both have a clearance hole 34 for avoiding the connecting column 60.

[0113] In order to ensure the fastening effect of the cover plate 51 and reduce the probability of the cover plate 51 moving when subjected to the reaction force of the disc spring 40, a connecting column 60 is provided on the base 10, and the connecting column 60 passes through the second mounting hole 512 of the cover plate 51, and then is threadedly connected to the connecting column 60 through the second fastener 61. Under the joint fastening action of the first fastener 52 and the second fastener 61, the cover plate 51 is locked and fixed. Compared with the fastening by the first fastener 52 alone, the fastening effect of the cover plate 51 is better, ensuring that the position of the cover plate 51 will not change during the test of the battery cell 200. In addition, the first fastener 52 and the second fastener 61 have different force transmission points for applying the fastening force to the cover plate 51, so the fastening force transmitted to the cover plate 51 is more uniform. By providing the first clamping plate 31 and the second clamping plate 32 with the clearance holes 34 for avoiding the connecting column 60, there is no matching and connecting relationship between the connecting column 60 and the first clamping plate 31 and the second clamping plate 32, so that the first clamping plate 31 and the second clamping plate 32 will not slide or contact with the connecting column 60, thereby reducing the influence of external force on the test of the battery cell 200 and improving the accuracy of the test of the battery cell 200.

[0114] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery testing fixture, characterized in that: include: A base, provided with a guide portion extending along a first direction; A clamping plate assembly, wherein the guide portion is slidably arranged along the first direction, and the clamping plate assembly is used to clamp the battery cell; A pressure testing component, disposed between the base and the clamping plate assembly; A cover plate assembly, comprising a cover plate and a first fastener, wherein the cover plate is slidably disposed on the guide portion and is located on a side of the clamping plate assembly away from the base, the first fastener is connected to the guide portion and is used to limit the movement of the cover plate along the side away from the base, and the first fastener is used to apply pressure to the clamping plate assembly through the cover plate; The disc spring is arranged between the cover plate and the clamping plate assembly, the compression stroke of the disc spring is h0, the plate thickness of the disc spring is t, and h0 / t satisfies: 1.4-1.

45.

2. The battery test fixture according to claim 1, characterized in that: The clamping plate assembly includes a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are both slidably arranged on the guide portion along the first direction, and the first clamping plate and the second clamping plate are used to clamp the battery cell; the first clamping plate is closer to the base than the second clamping plate, the pressure testing component is arranged between the base and the first clamping plate, and the disc spring is arranged between the second clamping plate and the cover plate.

3. The battery test fixture according to claim 2, characterized in that: The first clamping plate and the second clamping plate both have a first surface close to one side of the battery cell, and the first surface is a plane.

4. The battery test fixture according to claim 3, characterized in that: The disc spring has a center hole in the middle, the second clamping plate has a second surface facing away from the first surface, and a positioning portion is protruded from the middle of the second surface. The positioning portion is used for the center hole of the disc spring to be mounted to limit the movement of the disc spring on the surface of the second surface.

5. The battery test fixture according to claim 4, characterized in that: The center hole of the disc spring is loosely matched with the positioning portion.

6. The battery test fixture according to claim 4, characterized in that: The cover plate has an escape groove for escaping the positioning portion.

7. The battery test fixture according to claim 2, characterized in that: The guide portion includes a plurality of guide posts, and the plurality of guide posts are distributed at intervals on the peripheral side of the base. The first clamping plate and the second clamping plate both have guide holes for the guide posts to pass through.

8. The battery test fixture according to claim 7, characterized in that: The guide column is loosely matched with the guide hole.

9. The battery test fixture according to claim 7, characterized in that: The cover plate has a first mounting hole for the guide column to pass through, and the cover plate is sleeved on the guide column through the first mounting hole; the first fastener is threadedly connected to the guide column.

10. The battery test fixture according to claim 9, characterized in that: The battery test fixture also includes: A connecting column is arranged on the base and located between two adjacent guide columns, and the cover plate has a second mounting hole for the connecting column to pass through; A second fastener is threadedly connected to the connecting column, and the second fastener is used to limit the cover plate from moving along a side away from the base.

11. The battery test fixture according to claim 10, characterized in that: The first clamping plate and the second clamping plate both have a clearance hole for avoiding the connecting column.

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