Battery cell clamp and battery cell testing device

Abstract

The utility model provides a battery cell clamp and a battery cell testing device. The battery cell clamp comprises a clamping assembly and an auxiliary force application part, the clamping assembly comprises two clamping plates which are oppositely arranged, and a clamping space for accommodating a battery cell is formed between the two clamping plates; the auxiliary force application part is arranged on at least one of the two clamping plates, the auxiliary force application part comprises an injection port and a plurality of conveying channels, the injection port is communicated with the conveying channels, and one end of each conveying channel is communicated with the clamping space. And the injection port and the plurality of conveying channels of the battery cell clamp can be contacted with a force application medium and extrude the pressure-bearing surface of the battery cell, so that compensation pressure is provided for the battery cell, and the uniformity of overall stress on the pressure-bearing surface of the battery cell is improved. In addition, the high-temperature-resistant upper limit and the pressurization upper limit of the battery cell clamp can be improved by contacting the pressure-bearing surface with the force application medium.

Description

Technical Field

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

[0002] An all-solid-state battery is a battery that uses solid electrolytes instead of traditional liquid electrolytes. It has the characteristics of high energy density, long cycle life, wide temperature range, and flexible design. All-solid-state batteries do not have the risks of leakage, expansion, and combustion of liquid electrolytes, and can significantly improve safety performance.

[0003] During the test, the all-solid-state battery cannot be used with the fixture of the liquid electrolyte battery because its electrolyte is solid and the interface impedance is large, which is different from the liquid electrolyte battery. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell clamp and a battery cell testing device, wherein the battery cell clamp is helpful to improve the uniformity of the force applied to the battery cell.

[0005] In the first aspect, the present application provides a battery cell clamp, comprising a clamping assembly and an auxiliary force-applying member; the clamping assembly comprises two clamping plates arranged opposite to each other, and a clamping space for accommodating the battery cell is provided between the two clamping plates; the auxiliary force-applying member is arranged on at least one of the two clamping plates, and the auxiliary force-applying member comprises an injection port and a plurality of conveying channels, the injection port is connected to the plurality of conveying channels, and one end of each of the conveying channels is communicated with the clamping space.

[0006] In the technical solution of the embodiment of the present application, the battery cell clamp includes a clamping assembly and an auxiliary force-applying member, the clamping assembly includes two clamping plates, and the auxiliary force-applying member includes an injection port and multiple conveying channels. The injection port and the multiple conveying channels allow the force-applying medium to contact and squeeze the pressure-bearing surface of the battery cell, provide compensation pressure for the battery cell, and thus improve the uniformity of the overall force on the pressure-bearing surface of the battery cell. In addition, by contacting the pressure-bearing surface with the force-applying medium, the upper limit of the high temperature resistance of the battery cell clamp can also be increased, and the upper limit of the pressurization of the battery cell clamp can be increased.

[0007] In some embodiments, the two clamping plates are both provided with the auxiliary force-applying member, which can compensate for the pressure on the two pressure-bearing surfaces of the battery cell and provide heat dissipation, thereby improving the uniformity of the overall force on the battery cell and enhancing the heat dissipation effect.

[0008] In some embodiments, the injection port is a circular hole, which can effectively disperse the internal stress and reduce stress concentration; the aperture range of the injection port is 2 μm to 3 μm, which can effectively reduce the edge stress and improve the uniformity of pressure distribution.

[0009] In some embodiments, the plurality of conveying channels are evenly arranged in the clamping area of ​​the clamping plate, and the clamping area is located in the middle of the clamping plate, which can improve the uniformity of the force on the entire battery cell.

[0010] In some embodiments, the conveying channel is a circular hole, which can effectively disperse stress and improve the structural strength of the clamping plate and the uniformity of force on the battery cell; the diameter of the conveying channel is smaller than the spacing between adjacent axes of the conveying channel, which can improve the structural strength of the clamping plate.

[0011] In some embodiments, the diameter of the conveying channel is less than 1 μm, which can reduce edge stress when contacting the pressure-bearing surface and improve the uniformity of the overall force of the battery cell; the axial spacing between adjacent conveying channels is 1 μm, which can increase the contact area between the conveying channel and the pressure-bearing surface and enhance the pressure compensation effect.

[0012] In some embodiments, the axis of the conveying channel is arranged perpendicular to the clamping surface of the clamping plate for clamping the battery cell, which can not only shorten the pressurization time, but also reduce the edge stress and improve the uniformity of the force applied to the battery cell.

[0013] In some embodiments, the auxiliary force-applying member further includes a uniformly distributed cavity, which is respectively connected to the injection port and the plurality of delivery channels, so as to evenly distribute the force-applying medium injected from the injection port to each delivery channel, thereby improving the consistency of the pressure in the delivery channel.

[0014] In some embodiments, the clamping plate includes a clamping portion and an auxiliary portion, the clamping portion and the auxiliary portion are sealed, the injection port is arranged at the auxiliary portion, and the uniform cavity and the plurality of delivery channels are arranged at the clamping portion. The clamping plate is a split design, which is convenient for processing the uniform cavity, and can also realize simultaneous processing of the uniform cavity and the plurality of delivery channels, thereby improving processing efficiency and convenience.

[0015] In some embodiments, the spacing between the edge of the uniformly distributed cavity and the edge of the clamping plate along the first direction is 1 / 8 to 1 / 7 of the length of the clamping plate, and the spacing between the edge of the uniformly distributed cavity and the edge of the clamping plate along the second direction is 1 / 8 to 1 / 7 of the length of the clamping plate, which can improve the utilization rate of the clamping plate; the length of the conveying channel along the third direction is 1 / 4 to 1 / 2 of the length of the clamping plate, which can reduce the weakening of the structural strength of the clamping plate caused by processing the conveying channel and the uniformly distributed cavity, so that the stiffness of the clamping plate meets the clamping requirements; the first direction, the second direction, and the third direction are arranged perpendicular to each other.

[0016] In some embodiments, the length of the uniformly distributed cavity along the third direction is 2 μm to 3 μm, and the small size can not only optimize the internal stress itself, but also reduce the impact on the rigidity of the clamping plate itself.

[0017] In some embodiments, a connecting member is also included, which is arranged on one of the clamping plates and connected to the other clamping plate. The connecting member is configured to apply a clamping force to the two clamping plates, and can directly apply a force to the clamping plates to provide a source of force for the pressure applied by the clamping plates to the battery cells.

[0018] In some embodiments, the connecting member includes a screw and a nut. The screw is arranged on one of the clamping plates and is interlocked with the other clamping plate. The nut is threadedly connected to the screw and abuts against the other clamping plate. The force is provided to the clamping plate through the threaded connection. The structure is simple and the operation is convenient.

[0019] In a second aspect, the present application provides a battery cell testing device, which includes the battery cell fixture in the above embodiment.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a battery cell fixture according to some embodiments of the present application;

[0023] Figure 2 This is a schematic diagram of the disassembled structure of the battery cell fixture in some embodiments of the present application;

[0024] Figure 3 This is a schematic diagram of the disassembly structure of the clamping plate in some embodiments of the present application;

[0025] Figure 4 This is a schematic diagram of the positional relationship between the clamping plate and the uniformly distributed cavity in some embodiments of the present application;

[0026] Figure 5 For this application Figure 4 Sectional view at AA;

[0027] Figure 6 For this application Figure 5 Enlarged schematic diagram at position Ⅰ.

[0028] The reference numerals in the specific implementation manner are as follows:

[0029] 1-clamping plate; 11-clamping part; 12-auxiliary part;

[0030] 2- auxiliary force applying member; 21- injection port; 22- uniform cavity; 23- delivery channel;

[0031] 3-connecting piece; 31-nut; 32-screw;

[0032] 4-Battery cell;

[0033] X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein 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 figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0037] Reference to "embodiments" herein 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 herein may be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] At present, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric cars, electric transportation tools, as well as military equipment and aerospace and other fields. With the continuous expansion of the application fields of power batteries, their market demand is also constantly expanding.

[0043] As the market demand for power batteries continues to expand, the types of power batteries are becoming increasingly diverse, and all-solid-state batteries are an important development direction for power batteries. All-solid-state batteries are batteries that use solid electrolytes instead of traditional liquid electrolytes. They have the characteristics of high energy density, long cycle life, wide temperature range, and flexible design. All-solid-state batteries do not have the risks of leakage, expansion, and combustion of liquid electrolytes, and can significantly improve safety performance.

[0044] All-solid-state batteries do not have liquid electrolytes. Instead, their electrolytes are solid and need to conduct ions (such as lithium ions) through contact between particles. In order to promote good interface contact, a certain amount of pressure needs to be applied to the cells of the all-solid-state battery during testing.

[0045] In the related art, a steel plate clamp is used to apply a predetermined pressure to the battery cell. However, the large surface of the battery cell (the pressure-bearing surface of the battery cell) is uneven and is not an ideal plane. Therefore, the pressure on the pressure-bearing surface is uneven, and it is easy for some areas to be subjected to large forces and some areas to be subjected to small forces. When the pressure on the pressure-bearing surface of the battery cell is uneven, it is easy for the ion / electron conductivity at different positions to be inconsistent. The capacity of the area with small force is not fully utilized, which affects the electrical performance of the battery cell. The local current density in the area with large force is large, and there is a lot of lithium deposition. There may even be a safety risk that the deposited lithium may penetrate the electrolyte and cause a short circuit.

[0046] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a battery cell clamp according to some embodiments of the present application.

[0047] In order to improve the uniformity of force on the battery cell, pressure compensation can be performed on the area with less force on the pressure-bearing surface, and the force on the area with less force on the pressure-bearing surface can be increased specifically to make it close to the force on the area with greater force on the pressure-bearing surface, thereby making the force on the battery cell uniform.

[0048] Such a battery cell fixture includes a clamping assembly and an auxiliary force-applying member 2. The clamping assembly includes two clamping plates 1 arranged opposite to each other, a clamping space for accommodating the battery cell 4 is left between the two clamping plates 1, and the two clamping plates 1 are configured to apply pressure to the battery cell 4. Both clamping plates 1 apply pressure to the pressure-bearing surface of the battery cell 4 in the clamping space to meet the pressure requirements of the test. The auxiliary force-applying member 2 includes an injection port 21 and a plurality of conveying channels 23. The injection port 21 can receive a force-applying medium and convey the force-applying medium to the pressure-bearing surface of the battery cell 4 through the plurality of conveying channels 23 to squeeze the pressure-bearing surface. The pressure-bearing surface of the battery cell 4 is simultaneously subjected to pressure from the clamping plates 1 and pressure from the force-applying medium, so that the pressure in the area where the pressure-bearing surface is subjected to less force can be compensated by the force-applying medium, and the uniformity of force on the battery cell 4 is improved.

[0049] The battery cell fixture of the embodiment of the present application can be applied to various types of battery cell testing devices, and can be used in conjunction with medium delivery pipelines, various detection components, etc. to test various parameters of the battery cells of all-solid-state batteries. The battery cell fixture can improve the uniformity of force not only for all-solid-state battery cells, but also for liquid batteries when uniform pressure is required.

[0050] Please refer to Figures 2 to 6 , Figure 2 This is a schematic diagram of the disassembled structure of the battery cell fixture in some embodiments of the present application; Figure 3 This is a schematic diagram of the disassembly structure of the clamping plate in some embodiments of the present application; Figure 4 This is a schematic diagram of the positional relationship between the clamping plate and the uniformly distributed cavity in some embodiments of the present application; Figure 5 For this application Figure 4 Sectional view at AA; Figure 6 For this application Figure 5 An enlarged schematic diagram at position Ⅰ. Figure 4 The middle dashed line represents the outer contour of the uniform cavity.

[0051] An embodiment of the present application provides a battery cell clamp, which includes a clamping assembly and an auxiliary force-applying member 2; the clamping assembly includes two clamping plates 1 arranged opposite to each other, and a clamping space for accommodating a battery cell 4 is provided between the two clamping plates 1; the auxiliary force-applying member 2 is provided on at least one of the two clamping plates 1, and the auxiliary force-applying member 2 includes an injection port 21 and a plurality of conveying channels 23, the injection port 21 is connected to the plurality of conveying channels 23, and one end of each conveying channel 23 is connected to the clamping space.

[0052] The two clamping plates 1 are configured to directly contact the battery cell 4 and apply pressure to the battery cell 4. The two clamping plates 1 are arranged at intervals to form a clamping space, which allows the battery cell 4 to be placed between the two clamping plates 1 and squeezed. The clamping plates 1 squeeze the pressure-bearing surface of the battery cell 4 under the action of force, thereby directly applying pressure to the battery cell 4.

[0053] The outside world applies force to the clamping plate 1, thereby applying force (pressure) to the battery cell 4 through the clamping plate 1. When applying force from the outside, a power element such as a cylinder or a hydraulic cylinder can be used to apply pressure to the clamping plate 1; a mature pressure device such as a press can also be used to apply pressure to the two clamping plates 1; a force-applying mechanism can also be used to squeeze the two clamping plates 1, thereby applying pressure to the two clamping plates 1. Exemplarily, the force-applying mechanism can be a combination of bolts and nuts, the bolts are connected in series with the two clamping plates 1, and the nuts are threadedly connected to the bolts. In the process of tightening the nuts, the two clamping plates 1 are subjected to opposite forces, thereby applying pressure to the battery cell 4.

[0054] When the clamping plate 1 applies pressure to the battery cell 4, in order to improve the uniformity of the force applied to the battery cell 4, the structural strength of the clamping plate 1 itself needs to support the clamping plate 1 not to deform when the pressure is applied. Under this premise, the clamping plate 1 can be made of a polymer material (such as engineering plastics) or a metal material (such as 45# steel, 40Cr).

[0055] The auxiliary force-applying member 2 is disposed on the clamping plate 1 and is configured as a channel for the force-applying medium to flow. The force-applying medium can contact and squeeze the pressure-bearing surface of the battery cell 4 through the auxiliary force-applying member 2 to supplement the pressure for the area on the pressure-bearing surface with less force. The medium can be gaseous or liquid.

[0056] The auxiliary force-applying member 2 may be a structure processed on the clamping plate 1 . For example, the injection port 21 and the plurality of delivery channels 23 may be formed by laser processing.

[0057] The auxiliary force-applying member 2 may be integrally formed with the clamping plate 1 . For example, the clamping plate 1 may be formed by using 3D printing technology, and the auxiliary force-applying member 2 is formed on the clamping plate 1 during the forming process.

[0058] Among the two clamping plates 1 , one clamping plate 1 may be provided with the auxiliary force applying member 2 and the other clamping plate 1 may not be provided with the auxiliary force applying member 2 , or both clamping plates 1 may be provided with the auxiliary force applying member 2 .

[0059] In the auxiliary force-applying member 2, the injection port 21 is a port for the force-applying medium to enter the clamping plate 1. The injection port 21 is connected to a plurality of delivery channels 23. The medium can contact and squeeze the pressure-bearing surface of the battery cell 4 after passing through the delivery channels 23. The plurality of delivery channels 23 can be randomly distributed on the clamping plate 1, or can be distributed in an array on the clamping plate 1 (for example, the plurality of delivery channels 23 are distributed in a rectangular array or a circular array), or can be distributed at equal intervals on the clamping plate 1.

[0060] One end of each conveying channel 23 is connected to the clamping space, and the injection port 21 only needs to be connected to each conveying channel 23. The injection port 21 can be located on the surface of the clamping plate 1 away from the clamping space, or on the side of the clamping plate 1. Here, the surface of the clamping plate 1 facing the clamping space is the clamping surface, the surface of the clamping plate 1 away from the clamping space is the away surface, and any surface of the clamping plate 1 connecting the clamping surface and the away surface is the side surface.

[0061] The outer contour of the injection port 21 can be circular, elliptical, polygonal, etc., and the outer contour of the delivery channel 23 can be circular, elliptical, polygonal, etc. The outer contour shape of the injection port 21 and the outer contour shape of the delivery channel 23 can be the same or different.

[0062] When clamping the battery cell 4, the two clamping plates 1 squeeze the battery cell 4 at the same time, applying pressure to the two pressure-bearing surfaces of the battery cell 4. The battery cell 4 has bumps and depressions in the pressure direction and uneven thickness, so the thick area is subjected to greater pressure and the thin area is subjected to less pressure. The injection port 21 injects the medium through a medium injection device (for example, compressed air is injected through an air pump, liquid medium is injected through a hydraulic pump, etc.), and the medium contacts and squeezes the pressure-bearing surface through the conveying channel 23, which can provide pressure for the battery cell 4. When the conveying channel 23 encounters an area with less force on the pressure-bearing surface, the pressure on the area can be increased, thereby improving the uniformity of the force on the pressure-bearing surface. Multiple conveying channels 23 are all connected to the injection port 21, which can improve the consistency of the force applied by the medium in each conveying channel 23.

[0063] The medium applies a predetermined pressure to the battery cell 4, which may be equal to the maximum pressure directly applied by the clamping plate 1 to the pressure-bearing surface, or slightly less than the maximum pressure directly applied by the clamping plate 1 to the pressure-bearing surface (the force value of the area with less force on the pressure-bearing surface can be made close to the maximum pressure applied by the clamping plate 1).

[0064] In the above embodiment, the battery cell clamp includes a clamping assembly and an auxiliary force-applying member 2, the clamping assembly includes two clamping plates 1, and the auxiliary force-applying member 2 includes an injection port 21 and a plurality of conveying channels 23. The injection port 21 and the plurality of conveying channels 23 can allow the force-applying medium to contact and squeeze the pressure-bearing surface of the battery cell 4, thereby providing compensation pressure for the battery cell 4. When the conveying channel 23 contacts the area on the pressure-bearing surface with less pressure, the pressure in the area can be increased (the pressure value is increased to the pressure value applied by the force-applying medium), thereby improving the uniformity of the overall force on the pressure-bearing surface of the battery cell 4. In addition, by contacting the pressure-bearing surface with the force-applying medium, the battery cell 4 can also be cooled, thereby increasing the upper limit of the high temperature resistance of the battery cell clamp; the pressure applied by the battery cell clamp to the battery cell 4 depends on the pressure directly applied by the clamping plate 1 and the pressure directly applied by the force-applying medium, and therefore the upper limit of the pressurization of the battery cell clamp can also be increased by increasing the pressure of the two.

[0065] like Figure 2 As shown, according to some embodiments of the present application, optionally, both clamping plates 1 are provided with auxiliary force applying members 2 .

[0066] There are two auxiliary force-applying members 2 , and the two auxiliary force-applying members 2 correspond to the two clamping plates 1 one by one. One auxiliary force-applying member 2 is disposed on each clamping plate 1 .

[0067] When the auxiliary force-applying members 2 are arranged on the clamping plates 1, all the delivery channels 23 of the two auxiliary force-applying members 2 are connected to the clamping space, and the two injection ports 21 are located on the surface of the clamping plates 1 away from the clamping space. Among all the delivery channels 23, the delivery channels 23 on one clamping plate 1 and the delivery channels 23 on the other clamping plate 1 can correspond to each other one by one, or can be randomly arranged.

[0068] In the above embodiment, both clamping plates 1 are provided with auxiliary force-applying members 2, which can compensate for pressure and provide heat dissipation on the two pressure-bearing surfaces of the battery cell 4, thereby increasing the contact area between the conveying channel 23 and the pressure-bearing surface, improving the uniformity of the overall force of the battery cell 4 and enhancing the heat dissipation effect.

[0069] like Figure 3 As shown, according to some embodiments of the present application, optionally, the injection port 21 is a circular hole, and the pore diameter ranges from 2 μm to 3 μm.

[0070] The injection port 21 is a circular hole, and the axis of the circular hole is parallel to the pressurizing direction. The diameter of the circular hole can be any value among 2μm, 2.1μm, 2.2μm, 2.3μm, 2.4μm, 2.5μm, 2.6μm, 2.7μm, 2.8μm, 2.9μm, and 3μm, or any intermediate value between any two adjacent values.

[0071] The shape of the injection port 21 is related to the stress when the medium is injected; the size of the injection port 21 is related to the pressurization time. Compared with other polygonal holes, circular holes do not have the problem of stress concentration caused by edges. The smaller the size of the injection port 21, the longer it takes for the force-applying medium to reach the predetermined pressure, and the edge stress can be effectively reduced.

[0072] In the above embodiment, the injection port 21 is a circular hole, which can effectively disperse the internal stress and reduce the stress concentration. The hole diameter ranges from 2 μm to 3 μm, which can effectively reduce the edge stress and improve the uniformity of pressure distribution.

[0073] like Figures 4 to 6 As shown, according to some embodiments of the present application, optionally, a plurality of conveying channels 23 are evenly arranged in the clamping area of ​​the clamping plate 1 , and the clamping area is located in the middle of the clamping plate 1 .

[0074] The clamping plate 1 is divided into a clamping area, which is used to apply pressure to the battery cell 4. The clamping area is located in the middle of the clamping plate 1, and the periphery of the clamping area is a non-clamping area, which can be used to connect various auxiliary components.

[0075] When multiple conveying channels 23 are evenly arranged in the clamping area, the multiple conveying channels 23 are distributed in an array, which can be a circular array or a rectangular array. When multiple conveying channels 23 are distributed in an array, the distance between the axes of any two adjacent conveying channels 23 is set to be equal.

[0076] In the above embodiment, multiple conveying channels 23 are evenly arranged in the clamping area in the middle of the clamping plate 1, which can make the force of the clamping plate 1 more balanced, thereby improving the uniformity of the force of the battery cell 4 as a whole. In addition, the clamping area is divided on the clamping plate 1 and multiple conveying channels 23 are evenly arranged, which is convenient for processing the conveying channels 23. The size of the clamping area can be set according to the size of the battery cell 4 (the clamping area is slightly smaller than the pressure-bearing surface of the battery cell 4), reducing the processing workload, and leaving space for the installation of each auxiliary part 12 on the clamping plate 1.

[0077] like Figure 6 As shown, according to some embodiments of the present application, optionally, the delivery channel 23 is a circular hole, and the diameter of the delivery channel 23 is smaller than the distance between the axes of adjacent delivery channels 23 .

[0078] One end of the conveying channel 23 is connected to the clamping space. When the axis of the conveying channel 23 is perpendicular to the clamping surface of the clamping plate 1, the contour of the conveying channel 23 on the clamping surface is circular; when the axis of the conveying channel 23 intersects with the clamping surface of the clamping plate 1 (for example, the minimum angle is an acute angle), the contour of the conveying channel 23 on the clamping surface is elliptical. Regardless of whether the contour of the conveying channel 23 on the clamping surface is circular or elliptical, it is a smooth curve.

[0079] The distance between the axes of two adjacent conveying channels 23 is the sum of the radius of the two conveying channels 23 and the minimum distance between the walls of the two conveying channels 23. When the diameter of the conveying channel 23 is smaller than the distance between the axes of adjacent conveying channels 23, the walls of adjacent conveying channels 23 are spaced apart.

[0080] In the above embodiment, the delivery channel 23 is a circular hole, and the wall surface of the delivery channel 23 is smooth, which can effectively disperse the stress and improve the structural strength of the clamping plate 1. In addition, the profile of the delivery channel 23 on the clamping surface is a smooth curve, which can reduce the stress at the edge, thereby improving the uniformity of the force on the battery cell 4. In addition, there is a gap between the walls of adjacent delivery channels 23, which can improve the structural strength of the clamping plate 1.

[0081] like Figure 6 As shown, according to some embodiments of the present application, optionally, the diameter of the delivery channel 23 is less than 1 μm, and the axial distance between adjacent delivery channels 23 is 1 μm.

[0082] The conveying channel 23 is a circular hole, and the axis thereof is perpendicular to the clamping surface. A plurality of conveying channels 23 are arranged at equal intervals, and the spacing between the axes of adjacent conveying channels 23 is 1 μm.

[0083] Exemplarily, the diameter of the delivery channel 23 may be any value among 0.5 μm, 0.6 μm, 0.7 μm, 0.8 μm, and 0.9 μm, or any intermediate value between any two adjacent values ​​mentioned above.

[0084] In the above embodiment, the diameter of the delivery channel 23 is less than 1 μm, which can reduce the edge stress when contacting the pressure-bearing surface and improve the uniformity of the overall force of the battery cell 4. The axial spacing between adjacent delivery channels 23 is 1 μm, and the delivery channels 23 are densely distributed, which can increase the contact area between the delivery channels 23 and the pressure-bearing surface and improve the pressure compensation effect.

[0085] like Figure 5 As shown, according to some embodiments of the present application, optionally, the axis of the conveying channel 23 is arranged perpendicular to the clamping surface of the clamping plate 1 that clamps the battery cell 4 .

[0086] The axis of the conveying channel 23 is arranged perpendicular to the clamping surface, so that the cross-sectional profile of the conveying channel 23 is consistent with the profile shape of the conveying channel 23 on the clamping surface.

[0087] In the above embodiment, the axis of the conveying channel 23 is arranged perpendicular to the clamping surface. Firstly, it can reduce the flow path of the force-applying medium and shorten the pressurization time; secondly, it can reduce the contour size of the conveying channel 23 on the clamping surface, reduce edge stress, and improve the uniformity of force on the battery cell 4.

[0088] like Figure 3 and Figure 4As shown, according to some embodiments of the present application, optionally, the auxiliary force-applying member 2 further includes a uniformly distributed cavity 22 , and the uniformly distributed cavity 22 is respectively connected to the injection port 21 and the plurality of conveying channels 23 .

[0089] The uniform cavity 22 is a cavity formed by the auxiliary force-applying member 2 in the clamping plate 1, and is used to connect the injection port 21 and a plurality of conveying channels 23. Among them, one end of the injection port 21 is located on the diverging surface, and the other end is communicated with the uniform cavity 22; one end of the conveying channel 23 is located on the clamping surface, and the other end is communicated with the uniform cavity 22.

[0090] When pressure compensation is performed on the battery cell 4, the force medium enters the uniformly distributed cavity 22 from the injection port 21. After filling the uniformly distributed cavity 22, it can enter the clamping space through each conveying channel 23, contact and squeeze the pressure-bearing surface of the battery cell 4, and provide pressure compensation in the area with low pressure on the pressure-bearing surface.

[0091] In the above embodiment, the uniformly distributed cavity 22 is respectively connected to the injection port 21 and the plurality of delivery channels 23 , so as to evenly distribute the force medium injected from the injection port 21 to each delivery channel 23 , thereby improving the consistency of the pressure in the delivery channel 23 .

[0092] like Figure 3 As shown, according to some embodiments of the present application, optionally, the clamping plate 1 includes a clamping portion 11 and an auxiliary portion 12, the clamping portion 11 and the auxiliary portion 12 are sealed, the injection port 21 is arranged in the auxiliary portion 12, and the uniformly distributed cavity 22 and multiple conveying channels 23 are arranged in the clamping portion 11.

[0093] The uniform cavity 22 is a cavity formed inside the clamping plate 1, so the uniform cavity 22 does not directly contact the outer surface of the clamping plate 1, and cannot be directly formed on the surface of the clamping plate 1 by removing material. In order to realize the processing of the uniform cavity 22, the clamping plate 1 can be divided into two parts at the position where the uniform cavity 22 is to be processed, namely, the clamping part 11 and the auxiliary part 12, so as to expose the position where the uniform cavity 22 is to be processed. A groove connected to each conveying channel 23 is processed on the surface of the auxiliary part 12, and then the clamping part 11 and the auxiliary part 12 are sealed and connected together, and the processing of the uniform cavity 22 can be completed.

[0094] When the clamping part 11 and the auxiliary part 12 are sealed, the clamping part 11 and the auxiliary part 12 can be connected together by welding, and the clamping part 11 and the auxiliary part 12 are sealed by full welding at the outer edge of the contact surface, which can prevent the force medium from escaping. In addition, under the premise of meeting the sealing requirements and pressure requirements, the clamping part 11 and the auxiliary part 12 can also be sealed by bonding.

[0095] In the above embodiment, the clamping plate 1 is a split design, including a clamping portion 11 and an auxiliary portion 12, so that the position for processing the uniformly distributed cavity 22 can be exposed on the surface of the auxiliary portion 12, which is convenient for processing the uniformly distributed cavity 22. In addition, the injection port 21 is located on the auxiliary portion 12, and the uniformly distributed cavity 22 and the multiple conveying channels 23 are located on the clamping portion 11, so that the processing of the uniformly distributed cavity 22 and the multiple conveying channels 23 can be achieved at the same time, thereby improving the processing efficiency and convenience of processing.

[0096] like Figure 4 As shown, according to some embodiments of the present application, optionally, the distance (L1) between the edge of the uniformly distributed cavity 22 and the edge of the clamping plate 1 along the first direction X is 1 / 8 to 1 / 7 of the length (L0) of the clamping plate 1; the distance (W1) between the edge of the uniformly distributed cavity 22 and the edge of the clamping plate 1 along the second direction Y is 1 / 8 to 1 / 7 of the length (W0) of the clamping plate 1; the length of the conveying channel 23 along the third direction Z is 1 / 4 to 1 / 2 of the length of the clamping plate 1; the first direction X, the second direction Y, and the third direction Z are arranged perpendicularly in pairs.

[0097] The clamping plate 1 may be a cuboid having a length, a width and a height, wherein the length is along the first direction X, the width is along the second direction Y, and the height (i.e., the thickness of the clamping plate 1) is along the third direction Z. The outer contour of the uniform cavity 22 is a rectangle, wherein the length of the rectangle is along the first direction X, and the width is along the second direction Y. In the first direction X, the spacing between the edge of the uniform cavity 22 and the edge of the clamping plate 1 is 1 / 8 to 1 / 7 of the length of the clamping plate 1, i.e., the length of the uniform cavity 22 is 5 / 7 to 3 / 4 of the length of the clamping plate 1. In the second direction Y, the spacing between the edge of the uniform cavity 22 and the edge of the clamping plate 1 is 1 / 8 to 1 / 7 of the length of the clamping plate 1, i.e., the width of the uniform cavity 22 is 5 / 7 to 3 / 4 of the width of the clamping plate 1. Projected along the third direction Z, the projection area of ​​the uniform cavity 22 accounts for 25 / 49 to 9 / 16 of the projection area of ​​the clamping plate 1.

[0098] The length of the conveying channel 23 in the third direction Z is 1 / 4 to 1 / 2 of the length of the clamping plate 1, and the uniform cavity 22 is connected to the conveying channel 23, so that the distance between the uniform cavity 22 and the opposite surface of the clamping plate 1 is 1 / 2 to 3 / 4 of the thickness of the clamping plate 1. In the third direction Z, the length of the portion of the clamping plate 1 where the conveying channel 23 is processed does not exceed 1 / 2 of the total length of the clamping plate 1.

[0099] In the above embodiment, the distance between the edge of the uniform cavity 22 and the edge of the clamping plate 1 in the first direction X and the second direction Y is 1 / 8 to 1 / 7 of the length of the clamping plate 1, and the projection area of ​​the uniform cavity 22 along the third direction Z accounts for more than 1 / 2 of the projection area of ​​the clamping plate 1, and the clamping surface utilization rate of the clamping plate 1 is high. The length of the portion of the clamping plate 1 processed with the conveying channel 23 does not exceed 1 / 2 of the total length of the clamping plate 1, which can reduce the weakening of the structural strength of the clamping plate 1 caused by processing the conveying channel 23, so that the rigidity of the clamping plate 1 meets the clamping requirements.

[0100] like Figure 6 As shown, according to some embodiments of the present application, optionally, the length of the uniformly distributed cavity 22 along the third direction Z is 2 μm to 3 μm.

[0101] The uniformly distributed cavity 22 is a cavity formed inside the clamping plate 1 , and the shape of the cavity is a cuboid, having a length, a width and a height, wherein the length is along the first direction X, the width is along the second direction Y, and the height is along the third direction Z.

[0102] The height of the uniformly distributed cavity 22 ranges from 2 μm to 3 μm. Exemplarily, the height of the uniformly distributed cavity 22 can be any value among 2 μm, 2.2 μm, 2.4 μm, 2.6 μm, 2.8 μm, and 3 μm, or any intermediate value between any two adjacent values ​​mentioned above.

[0103] In the above embodiment, the length of the uniformly distributed cavity 22 along the third direction Z is 2 μm to 3 μm, and the small size can optimize its own internal stress and reduce the influence on the rigidity of the clamping plate 1 itself.

[0104] like Figure 1 and Figure 2 As shown, according to some embodiments of the present application, optionally, a connecting member 3 is further included, wherein the connecting member 3 is disposed on one clamping plate 1 and connected to another clamping plate 1 , and the connecting member 3 is configured to apply a clamping force to the two clamping plates 1 .

[0105] When providing pressure to the battery cell 4, the pressure is transmitted to the battery cell 4 by applying pressure to the clamping plate 1. When providing compensating pressure to the battery cell 4, the pressure is directly applied to the battery cell 4 through the force-applying medium.

[0106] When applying pressure to the clamping plates 1, the connecting member 3 can be used as a component for applying pressure to the two clamping plates 1. There can be multiple connecting members 3, each of which applies pressure to the clamping plates 1. For example, there are four connecting members 3, each of which is located at the four corners of the clamping plates 1.

[0107] The connecting member 3 can have various forms when realizing its function.

[0108] Exemplarily, the connector 3 may be a pneumatic clamp, and the pneumatic clamp may be a quick pneumatic clamp, which is respectively connected to the two clamping plates 1 to provide clamping force. The pressure provided by the pneumatic clamp is limited and cannot fully meet the high pressure requirements of the battery cell 4. When the pressure is too small, the interface contact of the battery cell 4 of the all-solid-state battery is poor, which also affects the performance parameters of the battery cell 4. On this basis, by arranging an auxiliary force-applying member 2 on the clamping plate 1, the force-applying medium can contact and squeeze the battery cell 4, which can provide pressure compensation for the battery cell 4. In addition, by increasing the pressure of the force-applying medium on the battery cell 4 to be greater than the pressure of the clamping plate 1 on the battery cell 4, the upper limit of the clamping force of the battery cell clamp can also be increased.

[0109] The connecting member 3 can also be a component for manually applying pressure. For example, the connecting member 3 can be a threaded fastener, which is respectively connected to the two clamping plates 1. By manually tightening the threaded fastener, the threaded fastener can apply opposite forces to the two clamping plates 1, so that the two clamping plates 1 apply pressure to the battery cell 4.

[0110] In the above embodiment, the battery cell 4 clamp further includes a connector 3 , which can directly apply a force to the clamping plate 1 , thereby providing a force source for the pressure applied by the clamping plate 1 to the battery cell 4 .

[0111] like Figure 2 As shown, according to some embodiments of the present application, optionally, the connecting member 3 includes a screw 32 and a nut 31, the screw 32 is arranged on one clamping plate 1 and is interlocked with the other clamping plate 1, and the nut 31 is threadedly connected to the screw 32 and abuts against the other clamping plate 1.

[0112] One end of the screw rod 32 is fastened to one clamping plate 1 and the other end passes through the other clamping plate 1 and is threadedly connected to the nut 31. When a force is applied to the clamping plate 1, a torque wrench can be used to tighten the nut 31 to provide a predetermined clamping force for the clamping plate 1.

[0113] When the screw rod 32 is fastened to a clamping plate 1 , the screw rod 32 may be fastened to the clamping plate 1 in the form of a threaded connection, or in the form of an interference fit.

[0114] The thread of the screw rod 32 can have various forms, such as triangular thread, trapezoidal thread, and sawtooth thread. The thread of the nut 31 matches the thread of the screw rod 32. The screw rod 32 and the nut 31 can both adopt triangular thread, which has good self-locking property and high strength.

[0115] Each connecting member 3 includes a screw 32 and a nut 31 . There may be four connecting members 3 , that is, the battery cell 4 clamp is equipped with four screws 32 and four nuts 31 . The four screws 32 and four nuts 31 provide clamping force at the four corners of the clamping plate 1 .

[0116] In the above embodiment, the connecting member 3 includes a screw rod 32 and a nut 31, and provides a force to the clamping plate 1 in the form of a threaded connection, which has a simple structure and is easy to operate.

[0117] According to some embodiments of the present application, the present application also provides a battery cell testing device, which includes the battery cell fixture in any of the above embodiments.

[0118] In the battery cell testing device, the battery cell clamp is used to clamp the battery cell and provide a pressing force for the battery cell. The battery cell testing device may include an air circuit assembly, which abuts against the injection port 21, and fills the auxiliary force-applying member 2 with compressed gas of a predetermined pressure, so that the battery cell clamp can provide pressure compensation for the battery cell. The battery cell testing device may also include various sensor components for detecting battery cell parameters. Since the battery cell testing device includes the battery cell clamp, the battery cell testing device has all the advantages of the battery cell clamp in any of the above-mentioned embodiments.

[0119] like Figures 1 to 6 As shown, according to some embodiments of the present application, a battery cell clamp is provided, which includes two clamping plates 1 arranged opposite to each other, the clamping plates 1 are metal plates, a clamping space is formed between the two clamping plates 1, and each clamping plate 1 is provided with an auxiliary force-applying member 2, each auxiliary force-applying member 2 includes an injection port 21, a uniformly distributed cavity 22, and multiple conveying channels 23. The injection port 21 is located on the reverse side of the clamping plate 1, and the injection port 21 is a circular hole with an aperture of 2μm to 3μm. The conveying channel 23 is a circular hole, and the axis is along the force-applying direction of the clamping plate 1. The aperture of the circular hole is less than 1μm, and the axis spacing between adjacent conveying channels 23 is 1μm. The auxiliary force-applying member 2 is located at the center of the clamping plate 1, and is distributed in a centrally symmetrical manner on the clamping plate 1. A screw 32 and a nut 31 are respectively provided at the four corners of the clamping plate 1. The force-applying medium is a compressed gas provided by the outside world. By adjusting the compression amount, the pressure applied by the force-applying medium to the pressure-bearing surface can be adjusted. By controlling the tightening force of the nut 31 and the screw 32, the clamping plate 1 can provide a predetermined pressure for the battery cell 4. The compressed gas enters the uniform cavity 22 from the injection port 21, and then enters the delivery channel 23, and can contact the pressure-bearing surface of the battery cell 4. When the delivery channel 23 contacts the area with less force on the pressure-bearing surface, the gas pressure can increase the pressure here to a level close to the area with greater force on the pressure-bearing surface; when the delivery channel 23 contacts the area with greater force on the pressure-bearing surface, the gas pressure has no significant effect, thereby effectively compensating for the pressure in the area with less pressure on the pressure-bearing surface of the battery cell 4, and improving the uniformity of the overall force on the battery cell 4.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell fixture, characterized in that: include: A clamping assembly, comprising two clamping plates arranged opposite to each other, with a clamping space for accommodating the battery cell between the two clamping plates; An auxiliary force-applying member is arranged on at least one of the two clamping plates, and the auxiliary force-applying member includes an injection port and a plurality of conveying channels. The injection port is connected to the plurality of conveying channels, and one end of each conveying channel is connected to the clamping space.

2. The battery cell fixture according to claim 1, characterized in that: The two clamping plates are both provided with the auxiliary force applying member.

3. The battery cell fixture according to claim 1, characterized in that: The injection port is a circular hole, and the pore diameter ranges from 2 μm to 3 μm.

4. The battery cell fixture according to claim 1, characterized in that: The plurality of conveying channels are evenly arranged in the clamping area of ​​the clamping plate, and the clamping area is located in the middle of the clamping plate.

5. The battery cell fixture according to claim 1, characterized in that: The conveying channel is a circular hole, and the diameter of the conveying channel is smaller than the distance between the axes of adjacent conveying channels.

6. The battery cell fixture according to claim 5, characterized in that: The diameter of the conveying channel is less than 1 μm, and the axial distance between adjacent conveying channels is 1 μm.

7. The battery cell fixture according to claim 1, characterized in that: The axis of the conveying channel is arranged perpendicularly to the clamping surface of the clamping plate for clamping the battery core.

8. The battery cell fixture according to claim 1, characterized in that: The auxiliary force-applying member further comprises a uniformly distributed cavity, and the uniformly distributed cavity is respectively connected to the injection port and the plurality of conveying channels.

9. The battery cell fixture according to claim 8, characterized in that: The clamping plate comprises a clamping portion and an auxiliary portion, the clamping portion and the auxiliary portion are sealed, the injection port is arranged at the auxiliary portion, and the uniformly distributed cavity and the plurality of conveying channels are arranged at the clamping portion.

10. The battery cell fixture according to claim 8, characterized in that: The distance between the edge of the uniform cavity and the edge of the clamping plate along the first direction is 1 / 8 to 1 / 7 of the length of the clamping plate; The distance between the edge of the uniform cavity and the edge of the clamping plate along the second direction is 1 / 8 to 1 / 7 of the length of the clamping plate; The length of the conveying channel along the third direction is 1 / 4 to 1 / 2 of the length of the clamping plate; The first direction, the second direction, and the third direction are arranged perpendicularly in pairs.

11. The battery cell fixture according to claim 10, characterized in that: The length of the uniformly distributed cavity along the third direction is 2 μm to 3 μm.

12. The battery cell fixture according to claim 1, characterized in that: It also includes a connecting member, which is arranged on one of the clamping plates and connected to the other clamping plate, and the connecting member is configured to apply a clamping force to the two clamping plates.

13. The battery cell fixture according to claim 12, characterized in that: The connecting member comprises a screw and a nut. The screw is arranged on one of the clamping plates and is interlocked with the other clamping plate. The nut is threadedly connected with the screw and abuts against the other clamping plate.

14. A battery cell testing device, characterized in that: Comprising the battery cell clamp as described in any one of claims 1 to 13.

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