Bearing device, solid-state battery isostatic pressing equipment and battery production system

Abstract

The utility model provides a bearing device, solid-state battery isostatic pressing equipment and a battery production system, and belongs to the technical field of batteries. The bearing device comprises a base and a sealing cover, the base is provided with a supporting face used for supporting one first side face of the solid-state battery electrode assembly, the sealing cover comprises a frame body and an elastic body connected with the frame body, and the elastic body and the inner surface of the frame body jointly define a containing groove used for containing the solid-state battery electrode assembly. The opening of the accommodating groove is hermetically connected with the base. Wherein the elastic body is arranged opposite to the other first side surface of the solid-state battery electrode assembly and is used for transmitting external pressure to the first side surface during isostatic pressing, and the frame body is arranged opposite to the second side surface and the end surface and is used for preventing the external pressure from being transmitted to the second side surface and the end surface during isostatic pressing. According to the bearing device, the stress direction of the solid-state battery electrode assembly during isostatic pressing can be limited, and the deformation of the length size and the width size of the solid-state battery electrode assembly is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a carrier device, a solid-state battery, and other static pressure equipment and a battery production system. Background Art

[0002] Solid-state batteries have become one of the future development trends due to their advantages such as high energy density, excellent cycle characteristics and high safety characteristics.

[0003] The main components of solid-state batteries include solid-state battery electrode assemblies, which include pole pieces and electrolytes. During the production process of solid-state battery electrode assemblies, there will be many microscopic gaps inside the pole pieces and the electrolytes. Higher pressure is required to compress these microscopic gaps, thereby achieving the densification of the solid-state battery electrode assembly and making the solid-solid interface evenly stressed to achieve ion conduction.

[0004] In some cases, isostatic pressing can be used to achieve the above-mentioned densification operation, but the size of the solid-state battery electrode assembly will change significantly after isostatic pressing, and the size change is uncontrollable, which is not conducive to the clamping and positioning of subsequent processes, thereby affecting the overall production efficiency. Utility Model Content

[0005] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide a carrier device, a solid-state battery and other static pressure equipment and a battery production system, thereby achieving the densification of the solid-state battery electrode assembly while also achieving controllable dimensional changes of the solid-state battery electrode assembly.

[0006] The embodiment of the first aspect of the present application provides a bearing device, which is used to bear a solid-state battery electrode assembly during isostatic pressing, wherein the solid-state battery electrode assembly includes two opposite first side surfaces, two opposite second side surfaces, and two opposite end surfaces, and the area of ​​the first side surface is greater than the area of ​​the second side surface. The bearing device includes a base and a sealing cover, wherein the base has a supporting surface for supporting one of the first side surfaces of the solid-state battery electrode assembly, and the sealing cover includes a frame and an elastic body connected to the frame, wherein the elastic body and the inner surface of the frame together define a receiving groove for receiving the solid-state battery electrode assembly, and the opening of the receiving groove is sealed and connected to the base. Among them, the elastic body is arranged opposite to the other first side surface of the solid-state battery electrode assembly, and is used to transmit external pressure to the first side surface during isostatic pressing, and the frame is arranged opposite to the second side surface and the end surface, and is used to prevent external pressure from being transmitted to the second side surface and the end surface during isostatic pressing.

[0007] In the technical solution of the embodiment of the present application, the external pressure is transmitted to the first side through the elastomer, and the external pressure is prevented from being transmitted to the second side and the end face through the frame, so that the solid-state battery electrode assembly is only subjected to a uniform force in the thickness direction, while the length and width directions are not subjected to force, and the frame can restrain the extension of the solid-state battery electrode assembly along the length and width directions, so that while the solid-state battery electrode assembly is densified, the length and width dimensions of the solid-state battery electrode assembly will not change significantly, reducing the deformation of the length and width dimensions of the solid-state battery electrode assembly, thereby achieving controllable length and width dimensions, thereby facilitating the clamping and positioning of the solid-state battery electrode assembly in subsequent processes, thereby improving production efficiency.

[0008] In some embodiments, along the direction perpendicular to the support surface, the depth of the receiving groove is less than the thickness of the solid-state battery electrode assembly, thereby compensating to a certain extent the value of the thickness reduction of the solid-state battery electrode assembly before and after isostatic pressing, so that the elastomer can always fully fit with the first side during the isostatic pressing process, thereby more effectively transmitting the external pressure to the first side.

[0009] In some embodiments, the ratio of the depth dimension to the thickness dimension is greater than or equal to 80% and less than or equal to 95%, so as to match and compensate for the change in thickness of the solid-state battery electrode assembly before and after isostatic pressing, so that the solid-state battery electrode assembly is pressed more evenly, which is conducive to improving the consistency of the compaction of the solid-state battery electrode assembly.

[0010] In some embodiments, the base includes a base body and a boss located on the base body, the support surface is formed on the side of the boss away from the base body, the boss extends into the receiving groove, and the boss and the receiving groove are interference fit, so as to facilitate the sealed connection between the receiving groove and the base, thereby providing a sealed cavity for isostatic pressing for the solid-state battery electrode assembly.

[0011] In some embodiments, the sealing cover further comprises an elastic layer, which is disposed on the inner surface of the frame body, so as to improve the sealing performance of the connection between the sealing cover and the side of the boss, reduce the contamination of the solid-state battery electrode assembly due to the infiltration of pressure liquid, and reduce the difficulty of assembly of interference fit.

[0012] In some embodiments, the elastic layer and the elastic body are integrally formed, so that the integrity of the structure is better and the reliability of the structure is improved.

[0013] In some embodiments, along a direction perpendicular to the support surface, the depth dimension of the receiving groove is greater than the thickness dimension of the solid-state battery electrode assembly, and less than the sum of the thickness dimension of the solid-state battery electrode assembly and the height dimension of the boss. This can not only improve the reliability of the connection between the sealing cover and the base, but also more effectively transmit the external pressure to the first side.

[0014] In some embodiments, the carrying device further comprises a locking assembly, which is used to lock the base and the sealing cover, thereby improving the sealing performance between the sealing cover and the base.

[0015] In some embodiments, the locking assembly includes a pressing plate and a connecting piece. The sealing cover is located between the pressing plate and the base, one end of the connecting piece is connected to the base, and the other end of the connecting piece is connected to the pressing plate, so that the sealing cover can always keep a close fit with the base.

[0016] In some embodiments, the locking assembly further comprises an elastic member, which is used to apply a pre-tightening force to make the base and the sealing cover fit each other, thereby improving the tightness of the connection between the base and the sealing cover.

[0017] In some embodiments, there are multiple pressing plates, which are arranged at intervals in a direction parallel to the support surface, so that the sealing cover can be evenly stressed, thereby improving the reliability of the connection between the sealing cover and the base.

[0018] In some embodiments, an insulating layer is provided on the support surface to reduce the short circuit phenomenon caused by the contact between the tabs of the solid-state battery electrode assembly and the support surface.

[0019] The second embodiment of the present application provides a solid-state battery isostatic pressing device, which includes an isostatic pressing cylinder and the carrying device in the above embodiment. The isostatic pressing cylinder contains pressurized liquid; the solid-state battery electrode assembly is placed in the carrying device and immersed in the pressurized liquid together with the carrying device.

[0020] An embodiment of the third aspect of the present application provides a battery production system, which includes the solid-state battery isostatic pressing equipment in the above-mentioned embodiment.

[0021] 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

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0023] Figure 1 This is a schematic diagram of the exploded structure of the carrying device in some embodiments of the present application;

[0024] Figure 2It is a schematic diagram of the partial structure of the sealing cover of some embodiments of the present application;

[0025] Figure 3 It is a schematic cross-sectional structure diagram of the sealing cover of some embodiments of the present application;

[0026] Figure 4 This is one of the schematic diagrams of the cooperation between the sealing cover and the base in some embodiments of the present application;

[0027] Figure 5 This is the second schematic diagram of the cooperation between the sealing cover and the base in some embodiments of the present application;

[0028] Figure 6 This is a schematic diagram of the structure of the carrying device of some embodiments of the present application.

[0029] Description of reference numerals:

[0030] 100. Carrying device;

[0031] 10. base; 11. support surface; 12. seat body; 13. boss;

[0032] 20. Sealing cover; 21. Frame; 22. Elastic body; 23. Accommodating groove; 24. Elastic layer;

[0033] 30. Locking assembly; 31. Pressing plate; 32. Connecting piece; 33. Elastic member;

[0034] 200. Solid-state battery electrode assembly;

[0035] 210, first side surface; 220, second side surface; 230, end surface; 240, pole ear;

[0036] X, length direction; Y, width direction; Z, thickness direction. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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).

[0043] 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.

[0044] 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.

[0045] Solid-state batteries have become one of the future development trends due to their advantages such as high energy density, excellent cycle characteristics and high safety characteristics.

[0046] The main components of solid-state batteries include solid-state battery electrode assemblies, which include pole pieces and electrolytes. During the production process of solid-state battery electrode assemblies, there will be many microscopic gaps inside the pole pieces and the electrolytes. Higher pressure is required to compress these microscopic gaps, thereby achieving the densification of the solid-state battery electrode assembly and making the solid-solid interface evenly stressed to achieve ion conduction.

[0047] In some cases, isostatic pressing is usually used to achieve the above-mentioned densification operation. The specific method can be that the solid-state battery electrode assembly is encapsulated in a sealed bag and then immersed in hydraulic oil. By increasing the pressure of the hydraulic oil, the hydraulic oil applies uniform pressure to the solid-state battery electrode assembly from all directions. Accordingly, the solid-state battery electrode assembly will deform and shrink after being compressed, that is, the dimensions in all directions will change significantly, and the dimensional changes are uncontrollable. In particular, if the length and width dimensions of the solid-state battery electrode assembly change significantly, it will be unfavorable for the clamping and positioning of subsequent processes, thereby affecting the overall production efficiency.

[0048] Based on the above considerations, the present application provides a bearing device, a solid-state battery isostatic pressing device and a battery production system, wherein the bearing device is used to bear a solid-state battery electrode assembly during isostatic pressing, wherein the solid-state battery electrode assembly includes two opposite first side surfaces, two opposite second side surfaces, and two opposite end surfaces, wherein the area of ​​the first side surface is greater than the area of ​​the second side surface. The bearing device includes a base and a sealing cover, wherein the base has a supporting surface for supporting one of the first side surfaces of the solid-state battery electrode assembly, and the sealing cover includes a frame and an elastic body connected to the frame, wherein the elastic body and the inner surface of the frame together define a receiving groove for receiving the solid-state battery electrode assembly, and the opening of the receiving groove is sealed and connected to the base. Among them, the elastic body is arranged opposite to the other first side surface of the solid-state battery electrode assembly, and is used to transmit external pressure to the first side surface during isostatic pressing, and the frame is arranged opposite to the second side surface and the end surface, and is used to prevent external pressure from being transmitted to the second side surface and the end surface during isostatic pressing.

[0049] The external pressure is transmitted to the first side surface through the elastic body, and the external pressure is prevented from being transmitted to the second side surface and the end surface through the frame, so that the solid-state battery electrode assembly is only subjected to a uniform force in the thickness direction, but not subjected to force in the length and width directions, and the frame can restrain the extension of the solid-state battery electrode assembly along the length and width directions, so that while the solid-state battery electrode assembly is densified, the length and width dimensions of the solid-state battery electrode assembly will not change significantly, reducing the deformation of the length and width dimensions of the solid-state battery electrode assembly, thereby achieving controllable length and width dimensions, which is beneficial to the subsequent processes for clamping and positioning the solid-state battery electrode assembly and improving production efficiency.

[0050] The supporting device disclosed in the embodiment of the present application can be used in the isostatic pressing process of solid-state battery electrode assemblies. The battery production system can be composed of the supporting device disclosed in the present application, solid-state battery isostatic pressing equipment, etc. This is beneficial for controlling the dimensional changes of the solid-state battery electrode assemblies during the isostatic pressing process, so as to facilitate subsequent clamping and positioning, thereby improving production efficiency.

[0051] Combination Figures 1 to 6 As shown, Figure 1 This is a schematic diagram of the exploded structure of the carrying device in some embodiments of the present application; Figure 2 It is a schematic diagram of the partial structure of the sealing cover of some embodiments of the present application; Figure 3 It is a schematic cross-sectional structure diagram of the sealing cover of some embodiments of the present application; Figure 4 This is one of the schematic diagrams of the cooperation between the sealing cover and the base in some embodiments of the present application; Figure 5 This is the second schematic diagram of the cooperation between the sealing cover and the base in some embodiments of the present application; Figure 6 This is a schematic diagram of the structure of the carrying device of some embodiments of the present application.

[0052] The embodiment of the present application provides a carrying device 100, which is used to carry a solid-state battery electrode assembly 200 during isostatic pressing. The solid-state battery electrode assembly 200 includes two opposite first side surfaces 210, two opposite second side surfaces 220, and two opposite end surfaces 230. The area of ​​the first side surface 210 is greater than the area of ​​the second side surface 220. The carrying device 100 includes a base 10 and a sealing cover 20. The base 10 has a supporting surface 11 for supporting one of the first side surfaces 210 of the solid-state battery electrode assembly 200. The sealing cover 20 includes a frame 21 and an elastic body 22 connected to the frame 21. The elastic body 22 and the inner surface of the frame 21 jointly define a receiving groove 23 for receiving the solid-state battery electrode assembly 200. The opening of the receiving groove 23 is sealed and connected to the base 10. Among them, the elastomer 22 is arranged opposite to the other first side surface 210 of the solid-state battery electrode assembly 200, and is used to transfer the external pressure to the first side surface 210 during isostatic pressing. The frame 21 is arranged opposite to the second side surface 220 and the end surface 230, and is used to prevent the external pressure from being transferred to the second side surface 220 and the end surface 230 during isostatic pressing.

[0053] The solid-state battery electrode assembly 200 is a component in the solid-state battery where chemical reactions occur. It is prepared by winding or lamination. During the charge and discharge process of the solid-state battery, along with the chemical reaction, the pole ear 240 of the solid-state battery electrode assembly 200 connects the electrode terminal to form a current loop. The solid-state battery electrode assembly 200 is rectangular or approximately rectangular as a whole. The end face 230 can be the surface of the end where the pole ear 240 of the solid-state battery electrode assembly 200 is located. The first side face 210 and the second side face 220 are located between the two end faces 230, and the first side face 210 and the second side face 220 are alternately arranged, that is, the second side face 220 is respectively connected to the two first side faces 210. In some examples, such as Figure 1 As shown, the first side 210 may be parallel to the plane defined by the length direction X and the width direction Y of the solid-state battery electrode assembly 200, the second side 220 may be approximately parallel to the plane defined by the length direction X and the thickness direction Z of the solid-state battery electrode assembly 200, and the area of ​​the first side 210 is greater than the area of ​​the second side 220, where the area may refer to the surface area, i.e., the first side 210 is the large surface of the solid-state battery electrode assembly 200.

[0054] The base 10 is a component used to support the solid-state battery electrode assembly 200 , wherein the support surface 11 is used to fit with one of the first side surfaces 210 .

[0055] The sealing cover 20 is a component used to cooperate with the base 10 and realize the densification of the solid-state battery electrode assembly 200 by means of external pressure. Among them, the inner surface of the frame 21 of the sealing cover 20 corresponds to the inner wall of the receiving groove 23, the elastic body 22 of the sealing cover 20 corresponds to the bottom surface of the receiving groove 23, the inner surface of the frame 21 is arranged opposite to the second side surface 220 and the end surface 230, the frame 21 is equivalent to extending along the circumferential direction of the solid-state battery electrode assembly 200, and the elastic body 22 is arranged opposite to the other first side surface 210. The elastic body 22 has a certain elasticity and can fully fit with the first side surface 210, so that the external pressure is evenly applied to the first side surface 210.

[0056] The opening of the receiving groove 23 is sealed and connected to the base 10, so that the space where the solid-state battery electrode assembly is located is a closed space. This can prevent the pressure liquid used for isostatic pressing from entering the receiving groove 23 to reduce the contamination of the solid-state battery electrode assembly 200 caused by the pressure liquid. The pressure liquid can be hydraulic oil.

[0057] The elastomer 22 can be made of elastic material, so that it can be elastically deformed when subjected to external pressure to achieve the transmission of external pressure, and the frame 21 can prevent the transmission of external pressure. The specific implementation method can be that the hardness of the frame 21 is relatively large, and its material can be alloy or steel, etc., so that it can withstand a large pressure. The hardness of the elastomer 22 is relatively small, and its material can be one or more of silicone, rubber, polyethylene, polypropylene, polystyrene, polymethyl methacrylate, polyvinyl chloride, nylon, polycarbonate, polyurethane, polytetrafluoroethylene, polyethylene terephthalate, etc. So that it can be deformed under the action of external pressure and fit with the first side 210, and the pressure is evenly applied to the first side 210. The material of the base 10 matched with the sealing cover 20 can be carbon steel, tungsten steel or alloy, etc., and accordingly, the base can withstand a large pressure.

[0058] During the isostatic pressing process, the carrier device 100 with the solid-state battery electrode assembly 200 placed therein is placed in a pressure liquid, and the pressure liquid applies pressure to each surface of the carrier device 100 . Since the frame 21 has sufficient strength and hardness, it can withstand external pressure and prevent the external pressure from being transmitted to the second side surface 220 and the end surface 230, so that the solid-state battery electrode assembly 200 is not affected by external pressure along its length and width directions, and the elastomer 22 can be deformed under the action of external pressure and fit with the first side surface 210, and the pressure is evenly applied to the first side surface 210, so that only the first side surface 210 of the solid-state battery electrode assembly 200 is subjected to pressure along the thickness direction Z, thereby, the length and width of the solid-state battery electrode assembly 200 will not be further compressed, and at the same time, in the process of the thickness of the solid-state battery electrode assembly 200 being further compressed, the frame 21 can restrain the extension of the solid-state battery electrode assembly 200 along the length direction X and the width direction Y, so that the length and width dimensions of the solid-state battery electrode assembly 200 will not change significantly, thereby achieving controllable length and width dimensions.

[0059] The external pressure is transmitted to the first side surface 210 through the elastic body 22, and the external pressure is prevented from being transmitted to the second side surface 220 and the end surface 230 through the frame 21, so that the solid-state battery electrode assembly 200 is only subjected to a uniform force in the thickness direction Z, while the length direction X and the width direction Y are not subjected to force, and the frame 21 can restrain the extension of the solid-state battery electrode assembly 200 along the length direction X and the width direction Y, so that while the solid-state battery electrode assembly 200 is densified, the length and width dimensions of the solid-state battery electrode assembly 200 will not change significantly, reducing the deformation of the length and width dimensions of the solid-state battery electrode assembly 200, thereby achieving controllable length and width dimensions, thereby facilitating the subsequent process of clamping and positioning the solid-state battery electrode assembly 200 and improving production efficiency.

[0060] like Figure 4 As shown, according to some embodiments of the present application, along a direction perpendicular to the support surface 11 , a depth d1 of the accommodating groove 23 is smaller than a thickness dimension t of the solid-state battery electrode assembly 200 .

[0061] The depth d1 of the receiving groove 23 is the distance between the end surface of the frame 21 facing the support surface 11 and the surface of the elastic body 22 facing the support surface 11. The thickness dimension t of the solid-state battery electrode assembly 200 is the distance between the two first side surfaces 210. It should be noted that the thickness dimension t here refers to the thickness of the solid-state battery electrode assembly 200 before isostatic pressing. Before the solid-state battery electrode assembly 200 is isostatically pressed, the depth d1 of the receiving groove 23 is less than the thickness dimension t. Then, when the sealing cover 20 is buckled on the solid-state battery electrode assembly 200 located on the support surface 11, the elastic body 22 fits with the first side surface 210, and a certain gap is formed between the end surface of the frame 21 facing the support surface 11 and the support surface 11. At this time, a force toward the support surface 11 can be applied to the frame 21, so that the frame 21 gradually approaches the support surface 11 until it fits with the support surface 11 to achieve a sealed connection, and the elastic body 22 is deformed. Under the action of the elastic force of the elastic body 22, the elastic body 22 and the support surface 11 can further fit fully with the first side surface 210. If the depth d1 of the receiving groove 23 is greater than the thickness dimension t, after the end surface of the frame 21 facing the support surface 11 fits with the support surface 11, the elastic body 22 cannot fit with the first side surface 210, which will make it difficult for the external pressure to be effectively transmitted to the first side surface 210 through the elastic body 22.

[0062] During the isostatic pressing process, the thickness dimension t of the solid-state battery electrode assembly 200 will decrease. Accordingly, the elastomer 22 can recover its deformation under the action of external pressure and shift toward the side close to the support surface 11 to compensate for the reduced value of the thickness dimension t to a certain extent, so that the elastomer 22 can always fit fully with the first side surface 210, thereby better transmitting the external pressure to the first side surface 210.

[0063] By setting the depth dimension d1 of the accommodating groove 23 to be smaller than the thickness dimension t of the solid-state battery electrode assembly 200, the elastomer 22 can be fitted with the first side 210 before isostatic pressing, and the difference between the depth dimension d1 and the thickness dimension t can compensate to a certain extent for the reduction in thickness of the solid-state battery electrode assembly 200 before and after isostatic pressing, so that the elastomer 22 can always be fully fitted with the first side 210 during the isostatic pressing process, thereby more effectively transmitting the external pressure to the first side 210.

[0064] According to some embodiments of the present application, a ratio of the depth dimension d1 to the thickness dimension t is greater than or equal to 80% and less than or equal to 95%.

[0065] The thickness dimension of the solid-state battery electrode assembly 200 after isostatic pressing is 80% to 95% of the thickness dimension before isostatic pressing, that is, the change in thickness dimension is 5% to 20%. Accordingly, the ratio of the depth dimension d1 to the thickness dimension before isostatic pressing is set to 80% to 95%, thereby matching and compensating for the change in thickness of the solid-state battery electrode assembly 200 before and after isostatic pressing.

[0066] The ratio of the depth dimension d1 to the thickness dimension t may be 80%, 83%, 85%, 87%, 90%, 92% or 95%, or any value between any two of the above values.

[0067] By setting the ratio of the depth dimension d1 to the thickness dimension t within a suitable range, the change in thickness of the solid-state battery electrode assembly 200 before and after isostatic pressing is matched and compensated, so that the elastomer 22 can always be fully fitted with the first side 210, so that the solid-state battery electrode assembly 200 is pressed more evenly, which is beneficial to improving the consistency of the compression of the solid-state battery electrode assembly 200.

[0068] Combination Figure 1 and Figure 5 As shown, according to some embodiments of the present application, the base 10 includes a base body 12 and a boss 13 located on the base body 12, the support surface 11 is formed on the side of the boss 13 away from the base body 12, the boss 13 extends into the receiving groove 23, and the boss 13 and the receiving groove 23 are interference fit.

[0069] The boss 13 is a component protruding from the base 12. When the sealing cover 20 is covered on the boss 13, the boss 13 extends into the receiving groove 23, and the side of the boss 13 is connected to the inner wall of the receiving groove 23, that is, the side of the boss 13 is in contact with the inner surface of the frame 21. The size of the boss 13 and the opening size of the receiving groove 23 can be designed as an interference fit, thereby achieving a sealed connection between the opening of the receiving groove 23 and the base 10. Specifically, the inner surface of the frame 21, the elastomer 22 and the supporting surface 11 together form a sealed cavity for isostatic pressing of the solid-state battery electrode assembly 200.

[0070] By providing a base 10 with a boss 13 and embedding the boss 13 into the receiving groove 23, a sealed connection between the receiving groove 23 and the base 10 is easily achieved, thereby providing a sealed cavity for isostatic pressing for the solid-state battery electrode assembly 200.

[0071] like Figure 2 , Figure 3 and Figure 5 As shown, according to some embodiments of the present application, the sealing cover 20 further includes an elastic layer 24 , and the elastic layer 24 is disposed on the inner surface of the frame 21 .

[0072] The inner surface of the frame 21 is used to connect with the side of the boss 13. The elastic layer 24 arranged on the inner surface of the frame 21 can achieve a sealed connection between the sealing cover 20 and the boss 13 through elastic deformation when in contact with the side of the boss 13.

[0073] In some embodiments, the elastic layer 24 may be made of one or more of silicone, rubber, polyethylene, polypropylene, polystyrene, polymethyl methacrylate, polyvinyl chloride, nylon, polycarbonate, polyurethane, polytetrafluoroethylene, polyethylene terephthalate, and the like.

[0074] By providing an elastic layer 24 on the inner surface of the frame 21 to improve the sealing performance of the connection between the sealing cover 20 and the side of the boss 13, the contamination of the solid-state battery electrode assembly 200 due to the infiltration of pressurized liquid is reduced, and the difficulty of assembly of the interference fit is reduced.

[0075] like Figure 2 , Figure 3 and Figure 5 As shown, according to some embodiments of the present application, the elastic layer 24 and the elastic body 22 are an integrally formed structure.

[0076] The elastic layer 24 and the elastic body 22 can be integrally formed by injection molding.

[0077] In some embodiments, the elastic layer 24 can be coated on the entire outer surface of the frame 21, that is, the frame 21 is entirely wrapped by the elastic layer 24, that is, the end surface of the frame 21 facing the seat 12 also has the elastic layer 24. During the isostatic pressing process, the elastic layer 24 at the end surface of the frame 21 facing the seat 12 can contact the seat 12 and achieve sealing. Thus, the inner surface of the frame 21 and the end surface of the frame 21 facing the seat 12 can be sealed with the base 10, thereby further improving the sealing effect of the sealing cover 20 and the base 10. At the same time, the elastic layer 24 coated on the outer surface of the frame 21 improves the reliability of the connection between the elastic layer 24 and the frame 21, so as to reduce the phenomenon of the elastic layer 24 being separated from the frame 21 under the action of external pressure.

[0078] By arranging the elastic layer 24 and the elastic body 22 as an integrally formed structure, the integrity of the structure is improved, thereby enhancing the reliability of the structure.

[0079] like Figure 5 As shown, according to some embodiments of the present application, along the direction perpendicular to the support surface 11, the depth dimension d2 of the accommodating groove 23 is greater than the thickness dimension t of the solid-state battery electrode assembly 200, and is smaller than the sum of the thickness dimension t of the solid-state battery electrode assembly 200 and the height dimension h of the boss.

[0080] The depth of the receiving groove 23 is the distance between the end surface of the frame 21 facing the support surface 11 and the surface of the elastic body 22 facing the support surface 11. The thickness dimension t of the solid-state battery electrode assembly 200 is the distance between the two first side surfaces 210. The height of the boss 13 is the height of the boss 13 protruding from the base 12. If the depth dimension d2 of the receiving groove 23 is greater than the thickness dimension t of the solid-state battery electrode assembly 200, then after the solid-state battery electrode assembly 200 is placed in the receiving groove, there is still a certain amount of space in the receiving groove 23 for the boss 13 to be embedded, so as to improve the reliability of the connection between the boss 13 and the frame 21. When the depth dimension t of the accommodating groove 23 is smaller than the sum of the thickness dimension t of the solid-state battery electrode assembly 200 and the height dimension h of the boss 13, there is a certain gap between the end face of the frame 21 facing the seat body 12 and the seat body 12, thereby reserving a certain space for the movement of the frame 21 toward the seat body 12 to compensate for the reduction in thickness of the solid-state battery electrode assembly 200 during the isostatic pressing process, thereby allowing the elastomer 22 to always fit with the first side surface 210, thereby being able to more effectively transfer the external pressure to the first side surface 210.

[0081] By setting the depth dimension d2 of the accommodating groove 23 to be greater than the thickness dimension t of the solid-state battery electrode assembly 200 and less than the sum of the thickness dimension t of the solid-state battery electrode assembly 200 and the height dimension h of the boss 13, the reliability of the connection between the sealing cover 20 and the base can be improved, and the external pressure can be more effectively transmitted to the first side 210.

[0082] Combination Figure 1 and Figure 6 As shown, according to some embodiments of the present application, the carrier device 100 further includes a locking assembly 30 , and the locking assembly 30 is used to lock the base 10 and the sealing cover 20 .

[0083] After the solid-state battery electrode assembly 200 is placed in the receiving groove 23, the base 10 and the sealing cover 20 are locked by the locking assembly 30, and the base 10 and the sealing cover 20 are tightly fitted. Then, during the isostatic pressing process, the opening of the receiving groove 23 and the base 10 can always maintain a sealed connection. After the isostatic pressing is completed, the locking assembly 30 is removed to take out the solid-state battery electrode assembly 200.

[0084] In some embodiments, the locking assembly 30 may be a bolt.

[0085] The base 10 and the sealing cover 20 are locked by providing the locking assembly 30 , thereby improving the sealing performance between the sealing cover 20 and the base 10 .

[0086] Combination Figure 1 and Figure 6As shown, according to some embodiments of the present application, the locking assembly 30 includes a pressing plate 31 and a connecting member 32. The sealing cover 20 is located between the pressing plate 31 and the base 10, one end of the connecting member 32 is connected to the base 10, and the other end of the connecting member 32 is connected to the pressing plate 31.

[0087] The sealing cover 20 is located between the pressing plate 31 and the base 10 , and the sealing cover 20 is pressed against the base 10 by the pressing plate 31 . The base 10 and the pressing plate 31 are connected by the connecting piece 32 , so that the sealing cover 20 can keep fitting with the base 10 .

[0088] In some embodiments, the connector 32 may be any feasible fastener, such as a threaded connector.

[0089] The sealing cover 20 is pressed onto the base 10 by the pressing plate 31 , and the base 10 and the pressing plate 31 are connected by the connecting piece 32 , so that the sealing cover 20 can always keep a close fit with the base 10 .

[0090] like Figure 6 As shown, according to some embodiments of the present application, the locking assembly 30 further includes an elastic member 33, and the elastic member 33 is used to apply a pre-tightening force that makes the base 10 and the sealing cover 20 fit each other.

[0091] The elastic member 33 is a component that can generate elastic force through its own deformation, and utilizes the elastic force to act on the base 10 or the sealing cover 20, thereby generating a pre-tightening force that makes the base 10 and the sealing cover 20 close to each other, which can enhance the reliability and tightness of the connection between the base 10 and the sealing cover 20, so as to reduce the gap between the base 10 and the sealing cover 20.

[0092] In some embodiments, the elastic member 33 can be a spring, and the connecting member 32 is a bolt. The bolt passes through the spring, the base 10 and the pressure plate 31 in sequence and is connected to the nut. The spring is compressed, and the elastic force generated by the spring acts on the base 10, so that the base 10 and the sealing cover 20 fit each other.

[0093] By providing the elastic member 33 to apply a pre-tightening force, the tightness of the connection between the base 10 and the sealing cover 20 is improved.

[0094] like Figure 1 As shown, according to some embodiments of the present application, there are multiple pressing plates 31 , and the multiple pressing plates 31 are arranged at intervals along a direction parallel to the supporting surface 11 .

[0095] In some embodiments, two pressure plates 31 are provided which are parallel to each other. Each pressure plate 31 is connected by two bolts. During the tightening process, the bolts are assembled by tightening them diagonally so that the sealing cover 20 can be subjected to balanced force, thereby reducing the tilting phenomenon between the sealing cover 20 and the base 10.

[0096] By providing a plurality of pressing plates 31 , the sealing cover 20 can be pressed onto the base 10 by the plurality of pressing plates 31 , so that the sealing cover 20 can be subjected to uniform force, thereby improving the reliability of the connection between the sealing cover 20 and the base 10 .

[0097] According to some embodiments of the present application, an insulating layer is provided on the supporting surface 11 .

[0098] When the solid-state battery electrode assembly 200 is placed on the support surface 11, the insulating layer is used to reduce the short circuit phenomenon caused by the contact between the pole ear 240 of the solid-state battery electrode assembly 200 and the support surface 11. At the same time, the insulating layer can also reduce the adhesion between the first side surface 210 of the solid-state battery electrode assembly 200 and the support surface 11, so as to facilitate the removal of the solid-state battery electrode assembly 200 from the support surface 11 after the isostatic pressing is completed.

[0099] In some embodiments, the insulating layer may be formed by Teflon plating or nickel plating, or by attaching Teflon glue or an insulating film to the support surface 11 .

[0100] By providing an insulating layer on the support surface 11 , the short circuit phenomenon caused by the contact between the tab 240 of the solid-state battery electrode assembly 200 and the support surface 11 can be reduced.

[0101] An embodiment of the second aspect of the present application provides a solid-state battery isostatic pressing device, including an isostatic pressing cylinder and a carrying device 100 as in the above embodiment, wherein the isostatic pressing cylinder contains pressurized liquid, and the solid-state battery electrode assembly 200 is placed in the carrying device 100 and immersed in the pressurized liquid together with the carrying device 100.

[0102] In some embodiments, the pressure liquid may be hydraulic oil, which is pressurized. The pressure in the hydraulic oil is applied to the carrier 100 and transmitted to the solid-state battery electrode assembly 200 , thereby completing the isostatic pressing of the solid-state battery electrode assembly 200 .

[0103] The solid-state battery isostatic pressing equipment in this embodiment can have all the beneficial effects of the above-mentioned carrying device 100, which will not be repeated here.

[0104] An embodiment of the third aspect of the present application provides a battery production system, including a static pressure device such as a solid-state battery in the above-mentioned embodiment.

[0105] The battery production system in this embodiment can have all the beneficial effects of the above-mentioned solid-state battery and other static pressure equipment, which will not be repeated here.

[0106] Combine the following Figures 1 to 6 The embodiments of the present application are described in further detail.

[0107] The carrying device 100 includes a base 10 , a sealing cover 20 and a locking assembly 30 .

[0108] The base 10 includes a base body 12 and a boss 13 located on the base body 12 . The boss 13 has a support surface 11 on a side facing away from the base body 12 . The support surface 11 is used to support one of the first side surfaces 210 of the solid-state battery electrode assembly 200 .

[0109] The sealing cover 20 includes a frame 21, an elastomer 22 and an elastic layer 24. The elastic layer 24 is coated on the surface of the frame 21, and the elastomer 22 is located in the frame 21 and is integrally formed with the elastic layer 24. The elastomer 22 and the inner surface of the frame 21 together define a receiving groove 23 for receiving the solid-state battery electrode assembly 200, and the boss 13 extends into the receiving groove 23, and is sealed and connected to the boss 13 under the action of the elastic layer 24. Among them, the elastomer 22 is arranged opposite to the other first side 210 of the solid-state battery electrode assembly 200, and is used to transmit the external pressure to the first side 210 during isostatic pressing, and the frame 21 is arranged opposite to the second side 220 and the end face 230, and is used to prevent the external pressure from being transmitted to the second side 220 and the end face 230 during isostatic pressing.

[0110] The locking assembly 30 includes two pressing plates 31, four bolts and four springs. The two pressing plates 31 are arranged in parallel and spaced apart to press the sealing cover 20 onto the base 10. Each pressing plate 31 is provided with two bolts, which are respectively assembled at both ends of the pressing plate 31. Each bolt passes through a spring, the base 10 and the pressing plate 31 in sequence and is connected to a nut. When the nut is tightened, it is tightened by tightening it diagonally.

[0111] After completing the locking of the base 10 and the sealing cover 20, the supporting device 100 is immersed in hydraulic oil and pressurized. The pressure of the hydraulic oil is transmitted to the first side 210 of the solid-state battery electrode assembly 200 through the elastomer, and the frame 21 prevents the pressure from being transmitted to the second side 220 and the end face 230 of the solid-state battery electrode assembly 200, so that the solid-state battery electrode assembly 200 is only subjected to the force along the thickness direction Z.

[0112] 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 carrying device for carrying a solid-state battery electrode assembly during isostatic pressing, characterized in that: The solid-state battery electrode assembly comprises two opposite first side surfaces, two opposite second side surfaces, and two opposite end surfaces, and the area of ​​the first side surface is greater than the area of ​​the second side surface; the carrying device comprises: A base having a support surface for supporting one of the first side surfaces of the solid-state battery electrode assembly; A sealing cover, comprising a frame and an elastic body connected to the frame, wherein the elastic body and the inner surface of the frame together define a receiving groove for receiving the solid-state battery electrode assembly, and an opening of the receiving groove is sealedly connected to the base; Among them, the elastomer is arranged opposite to the other first side surface of the solid-state battery electrode assembly, and is used to transfer external pressure to the first side surface during isostatic pressing; the frame is arranged opposite to the second side surface and the end surface, and is used to prevent external pressure from being transmitted to the second side surface and the end surface during isostatic pressing.

2. The carrying device according to claim 1, characterized in that: Along a direction perpendicular to the supporting surface, the depth dimension of the accommodating groove is smaller than the thickness dimension of the solid-state battery electrode assembly.

3. The carrying device according to claim 2, characterized in that: A ratio of the depth dimension to the thickness dimension is greater than or equal to 80% and less than or equal to 95%.

4. The carrying device according to claim 1, characterized in that: The base comprises a base body and a boss located on the base body; The supporting surface is formed on a side of the boss away from the seat body; the boss extends into the receiving groove, and the boss and the receiving groove are interference fit.

5. The carrying device according to claim 4, characterized in that: The sealing cover further comprises an elastic layer, and the elastic layer is arranged on the inner surface of the frame body.

6. The carrying device according to claim 5, characterized in that: The elastic layer and the elastic body are an integrally formed structure.

7. The carrying device according to claim 4, characterized in that: Along the direction perpendicular to the supporting surface, the depth dimension of the accommodating groove is greater than the thickness dimension of the solid-state battery electrode assembly, and is smaller than the sum of the thickness dimension of the solid-state battery electrode assembly and the height dimension of the boss.

8. The carrying device according to any one of claims 1 to 7, characterized in that: The carrying device also includes a locking assembly; The locking assembly is used to lock the base and the sealing cover.

9. The carrying device according to claim 8, characterized in that: The locking assembly comprises: A pressing plate, wherein the sealing cover is located between the pressing plate and the base; A connecting piece, one end of which is connected to the base, and the other end of which is connected to the pressing plate.

10. The carrying device according to claim 9, characterized in that: The locking assembly further includes an elastic member; The elastic component is used to apply a pre-tightening force to make the base and the sealing cover fit each other.

11. The carrying device according to claim 9, characterized in that: There are multiple pressing plates, and the multiple pressing plates are arranged at intervals along a direction parallel to the supporting surface.

12. The carrying device according to any one of claims 1 to 7, characterized in that: An insulating layer is arranged on the supporting surface.

13. A solid-state battery isostatic pressing device, characterized in that: include: Isostatic cylinder, containing pressurized liquid; as well as The carrying device according to any one of claims 1 to 12; The solid-state battery electrode assembly is placed in the carrier and immersed in the pressure liquid together with the carrier.

14. A battery production system, characterized in that: Comprising a solid-state battery isostatic pressing device as claimed in claim 13.

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