Clamp, isostatic pressing device and battery production equipment

Abstract

The invention relates to a clamp, an isostatic pressing device and battery production equipment, and belongs to the technical field of battery production. The clamp is used for clamping a single battery, the single battery comprises an electrode assembly and a flexible packaging film for packaging the electrode assembly, the clamp comprises a first clamping piece and a second clamping piece which are oppositely arranged in the first direction, the first clamping piece and the second clamping piece are each provided with an avoiding part, and the avoiding parts penetrate through the first clamping piece and the second clamping piece in the first direction; the first clamping piece and the second clamping piece are configured to clamp the flexible packaging film at least on one opposite side edge of the battery monomer, and the avoiding part is configured to completely cover the electrode assembly along the projection of the first direction. According to the clamp, the isostatic pressing device and the battery production equipment provided by the invention, the effect uniformity of isostatic pressing at each position of the battery monomer is improved while the rigidity of the outer surface of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a clamp, an isostatic pressing device and battery production equipment. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] A solid-state battery is a battery that uses solid electrodes and solid electrolytes. Isostatic pressing technology for solid-state batteries is one of the key technologies for preparing solid-state batteries. Isostatic pressing technology refers to improving the performance and stability of solid-state batteries by applying static pressure, usually by compacting the electrode components with uniform force under high pressure.

[0004] However, in the related art, the clamp usually acts directly on the surface of the electrode assembly, affecting the uniformity of the pressure on the outer surface of the electrode assembly during the isostatic pressing process, which can easily lead to product defects. Summary of the Invention

[0005] In view of the above problems, the present application provides a clamp, an isostatic pressing device and a battery production equipment, which can improve the rigidity of the outer surface of the battery cell while improving the uniformity of the isostatic pressing effect at various positions of the battery cell.

[0006] In a first aspect, an embodiment of the present application provides a clamp for clamping a battery cell, wherein the battery cell includes an electrode assembly and a flexible packaging film that encapsulates the electrode assembly. The clamp includes a first clamping member and a second clamping member arranged opposite to each other along a first direction. The first clamping member and the second clamping member are both provided with an avoidance portion, which passes through the first clamping member and the second clamping member along the first direction. The first clamping member and the second clamping member are configured to clamp the flexible packaging film at least at both ends of the battery cell along the second direction. The avoidance portion is configured to completely cover the electrode assembly along the projection of the first direction, and the second direction intersects with the first direction.

[0007] In the technical solution of the embodiment of the present application, the first clamping member and the second clamping member are both designed to be provided with an avoidance portion, and the avoidance portion penetrates the first clamping member and the second clamping member along the first direction, and the first clamping member and the second clamping member are used to jointly clamp the flexible packaging film of the battery cell, and the avoidance portion avoids the electrode assembly along the first direction. The clamping force exerted by the first clamping member and the second clamping member on the flexible packaging film is used to increase the tension of the flexible packaging film on the electrode assembly, which can improve the overall stiffness of the outer surface of the electrode assembly without contacting the electrode assembly, thereby improving the reliability of the battery cell during the isostatic pressing process. At the same time, the first clamping member and the second clamping member indirectly clamp the electrode assembly through the flexible packaging film, which can reduce the influence of the clamp on the isostatic pressing, improve the uniformity of the pressure applied to each position of the outer surface of the electrode assembly during the isostatic pressing process, and is beneficial to improving the effect of the isostatic pressing treatment.

[0008] In some embodiments, the first clamping member includes two clamping plates arranged opposite each other along the second direction, with surfaces of the two clamping plates proximate the second clamping member along the first direction being coplanar. The two clamping plates are configured to engage with the second clamping member on opposite sides of the battery cell to clamp the flexible packaging film. The two clamping plates clamp the flexible packaging film from opposite sides of the battery cell, thereby enhancing the overall rigidity of the outer surface of the electrode assembly. The provision of the two clamping plates also simplifies the structure of the first clamping member, facilitating miniaturization of the clamp itself and enabling compatibility with isostatic pressing apparatuses of various sizes.

[0009] In some embodiments, at least one of the two clamping plates is movable in the second direction. This design can adapt to the dimensional shrinkage of the electrode assembly during isostatic pressing, reducing the pulling of the flexible packaging film caused by the electrode assembly's dimensional shrinkage during isostatic pressing. This, in turn, reduces the risk of damage to the flexible packaging film during isostatic pressing, further improving the reliability of the clamp.

[0010] In some embodiments, the first clamping member further includes an elastic member disposed along the second direction, disposed between the two clamping plates and connected to each of the two clamping plates. This design utilizes the elastic member to enhance the integrity of the two clamping plates while also limiting the spacing between the two second clamping plates along the second direction. This allows the two clamping plates to move toward each other under external pressure (during the isostatic pressing process) to accommodate the reduction in size of the electrode assembly. Furthermore, when the external pressure gradually subsides, the two clamping plates automatically return to their original positions under the action of the elastic member, further enhancing the reliability of the clamp.

[0011] In some embodiments, there are multiple elastic members, and each elastic member is configured so that its projection along the first direction is offset from the electrode assembly. Configuring the elastic members so that their projection along the first direction is offset from the electrode assembly can reduce the risk of interference between the elastic members and the electrode assembly after the first clamping member and the second clamping member are clamped, thereby further improving the reliability of the clamp.

[0012] In some embodiments, the number of the elastic member is at least one, and the stiffness K of the elastic member along the second direction satisfies the following formula:

[0013]

[0014] Where f is the pressure applied to a single elastic member during isostatic pressing, L is the initial length of the elastic member, N is the number of elastic members, and I is the amount of contraction of the elastic member during isostatic pressing. This design approach allows for the calculation of the appropriate stiffness of a single elastic member by measuring the pressure f applied to the individual elastic member during isostatic pressing, the initial length L of the elastic member (the distance between the two clamping plates in the second direction), and the amount of contraction of the elastic member during isostatic pressing. This facilitates the selection of fixture stiffness before production, ensuring a more suitable fixture for isostatic pressing requirements and further improving fixture reliability.

[0015] In some embodiments, the first direction is configured to be perpendicular to the large surface of the battery cell. Clamping the battery cell along the large surface of the battery cell can maximize the rigidity of a larger area of ​​the battery cell outer surface, further improving the reliability of the isostatic pressing process.

[0016] In some embodiments, in the second direction, each clamping plate is configured to have a maximum spacing of 2 mm to 5 mm from the electrode assembly. This design approach can maintain an appropriate spacing between each clamping plate and the electrode assembly, thereby improving the tensioning effect on the flexible packaging film.

[0017] In some embodiments, the size of each clamping plate in the second direction is 2 mm to 5 mm. This design can make the clamping plate have an appropriate width, increase the friction between the clamping plate and the flexible packaging film, and thus improve the clamping effect of the flexible packaging film.

[0018] In some embodiments, the size of each clamping plate in the first direction is 1 mm to 3 mm. This design can improve the rigidity of the clamping plate itself and improve the reliability of the clamping plate during the isostatic pressing process.

[0019] In some embodiments, the clamp includes two flexible tensioning membranes, each connected to a first clamping member and a second clamping member. In the first direction, the projection of the escape portion falls entirely within the flexible tensioning membranes. By designing the clamp to include two flexible tensioning membranes, the first clamping member and the second clamping member can each drive the two flexible tensioning membranes to clamp the battery cell in the first direction. The flexible tensioning membranes can further enhance the overall rigidity of the battery cell's outer surface, making it more suitable for the isostatic pressing process.

[0020] In some embodiments, the clamp further includes a buffer member disposed on a surface of the first clamping member proximal to the second clamping member, and / or disposed on a surface of the second clamping member proximal to the first clamping member; the buffer member is configured such that its projection along the first direction at least partially overlaps with the flexible packaging film. Providing the buffer member on opposing surfaces of the first and second clamping members provides a buffering effect during the clamping process between the first and second clamping members, reducing the risk of the first and second clamping members damaging the flexible packaging film. Furthermore, the buffer member can increase friction between the first and second clamping members and the flexible packaging film, thereby facilitating improved tensioning of the flexible packaging film.

[0021] In some embodiments, the clamp further includes a connecting member connected to the first clamping member and the second clamping member, respectively; the connecting member is configured to be retractable along a first direction. The connecting member is used to improve the structural consistency of the first clamping member and the second clamping member, and to control the spacing between the first clamping member and the second clamping member in the first direction, as well as the preload force applied to the flexible packaging film.

[0022] In some embodiments, the second clamping member is symmetrically arranged with the first clamping member along a plane perpendicular to the first direction. That is, the second clamping member has the same structure as the first clamping member, and also includes two clamping plates and an elastic member between the two clamping plates. This arrangement unifies the structure of the first and second clamping members, eliminating the need to design two separate molds, thereby improving the production efficiency and cost-effectiveness of the clamp.

[0023] An embodiment of the present application also provides an isostatic pressing device, which includes a clamp as provided in any of the aforementioned embodiments.

[0024] An embodiment of the present application further provides a battery production device, which includes the isostatic pressing device provided in any of the aforementioned embodiments.

[0025] 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

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application;

[0028] Figure 2 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0029] Figure 3 A schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0030] Figure 4 A schematic cross-sectional view of a clamp provided in some embodiments of the present application;

[0031] Figure 5 A top view of a fixture provided for some embodiments of the present application.

[0032] Description of reference numerals: 1000, battery device;

[0033] 100, clamp; 10, first clamping member; 11, clamping plate; 12, elastic member; 20, second clamping member; 40, buffer member; 50, connecting member;

[0034] 101, avoidance portion; X, first direction; Y, second direction; Z, third direction;

[0035] 200, battery cell; 201, electrode assembly; 2011, main body; 2012, tab; 202, flexible packaging film;

[0036] 300, box body; 301, first part; 302, second part. DETAILED DESCRIPTION

[0037] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if the 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. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] In addition, if the term "and / or" appears, "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: 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 objects associated with each other are in an "or" relationship. If the terms "first" and "second" appear, these terms are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0043] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields. As power battery applications continue to expand, market demand is also growing.

[0044] The solid electrolyte of a solid-state battery typically consists of multiple solid particles. The contact properties between the solid particles have a significant impact on the performance of the solid-state battery. For example, if the contact between the solid particles is weak, the transport kinetics of charged ions between the solid particles will be low, thus affecting the performance of the solid-state battery.

[0045] In the related art, in order to improve the densification performance of solid-state batteries, solid-state batteries will be subjected to isostatic pressing. Specifically, after preparing the electrode assembly of the solid-state battery, the electrode assembly can be subjected to isostatic pressing, and the electrode assembly can be placed in an isostatic pressing environment to pressurize the electrode assembly. Since the length and width of the solid-state battery are usually much larger than the thickness, that is, it presents flat plate characteristics, this structure can be regarded as a structure with infinite in-plane stiffness and extremely small out-of-plane stiffness. It is prone to aging phenomena such as bending and crushing during isostatic pressing. Therefore, when the solid-state battery is subjected to isostatic pressing, it is usually necessary to clamp the battery with a clamp to improve the out-of-plane stiffness.

[0046] However, the clamps of related technologies usually act directly on the electrode assembly, so that the part of the electrode assembly clamped by the clamp cannot be subjected to the same pressure as other parts during the isostatic pressing process, which in turn has a significant impact on the isostatic pressing effect.

[0047] Based on the above considerations, to enhance the structural strength of a battery cell during isostatic pressing and to improve the uniformity of pressure applied to the outer surface of the battery cell during isostatic pressing, an embodiment of the present application provides a clamp comprising a first clamping member and a second clamping member disposed opposite each other along a first direction. Each of the first clamping member and the second clamping member is provided with a relief portion. The first clamping member and the second clamping member are configured to clamp a flexible packaging film along at least one opposing side of the battery cell, and the relief portion is configured such that its projection along the first direction completely covers the electrode assembly. In this manner, the clamp can clamp the battery cell by clamping the flexible packaging film, indirectly enhancing the stiffness of the outer surface of the electrode assembly through the flexible packaging film. Furthermore, because the first clamping member and the second clamping member do not directly act on the electrode assembly, the risk of the clamp affecting the isostatic pressing effect of the electrode assembly during isostatic pressing is reduced. This improves the structural reliability of the battery cell during isostatic pressing and enhances the isostatic pressing effect of the battery cell.

[0048] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as mobile phones, tablets, laptop computers, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0049] See also Figure 1 , Figure 1 Schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application. The battery device 1000 includes a housing 300 and a battery cell 200, with the battery cell 200 housed within the housing 300. The housing 300 is used to provide a storage space for the battery cell 200 and can adopt a variety of structures. In some embodiments, the housing 300 can include a first portion 301 and a second portion 302, which overlap each other and together define a storage space for the battery cell 200.

[0050] In the battery device 1000, there may be multiple battery cells 200, and the multiple battery cells 200 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 200. The multiple battery cells 200 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit formed by the multiple battery cells 200 may be housed within the housing 300. Of course, the battery device 1000 may also be a battery module formed by first connecting the multiple battery cells 200 in series, in parallel, or in a hybrid connection, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid connection to form an entire battery unit, which is then housed within the housing 300. The battery device 1000 may also include other structures, for example, the battery device 1000 may further include a busbar component for electrically connecting the multiple battery cells 200.

[0051] A battery cell 200 is the smallest unit of a battery and includes end caps, a housing, an electrode assembly 201, and other functional components. The electrode assembly 201 is the component within the battery cell 200 where electrochemical reactions occur. The housing may contain one or more electrode assemblies 201.

[0052] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the electrode assembly of some embodiments of the present application. The electrode assembly 201 may include a positive electrode sheet, a negative electrode sheet, and a solid electrolyte. The solid electrolyte is located between the positive electrode sheet and the negative electrode sheet and is used to form an ion channel between the positive electrode sheet and the negative electrode sheet to ensure the transfer and reaction of positive and negative ions. The material of the solid electrolyte may include oxides, phosphates, silicates, nitrides, or sulfides. The positive electrode sheet, the negative electrode sheet, and the solid electrolyte sandwiched between the positive electrode sheet and the negative electrode sheet are wound or stacked to form the electrode assembly 201. Figure 2 The electrode assembly shown in FIG. 2 is formed by stacking a positive electrode sheet, a negative electrode sheet, and a solid electrolyte. The portions of the positive and negative electrode sheets containing active material constitute the main body 2011 of the electrode assembly 201, while the portions of the positive and negative electrode sheets not containing active material constitute the tabs 2012. The tabs 2012 can be located at one end of the main body or at either end of the main body 2011. The shape of the electrode assembly 201 can be rectangular, cylindrical, or other shapes.

[0053] Figure 3 This is a schematic diagram of the structure of the packaged electrode assembly in some embodiments of the present application. Figure 2 and Figure 3 The flexible packaging film 202 is coated on the surface of the electrode assembly 201. At this time, the flexible packaging film 202 can be regarded as the aforementioned outer shell (end cover, shell) structure of the battery cell, that is, the flexible packaging film 202 encapsulates the electrode assembly 201 to form a battery cell 200.

[0054] For example, in these embodiments of the present application, the flexible packaging film 202 can be one of an aluminum-plastic film, a polyethylene film, and a polypropylene film. The thickness of the flexible packaging film 202 is greater than or equal to 50 micrometers (μm) and less than or equal to 500 μm. For example, the thickness of the flexible packaging film 202 is 300 μm.

[0055] Please refer to Figures 1 to 5 An embodiment of the present application provides a clamp 100 for clamping a battery cell 200. The battery cell 200 includes an electrode assembly 201 and a flexible packaging film 202 that encapsulates the electrode assembly 201. The clamp 100 includes a first clamping member 10 and a second clamping member 20 that are arranged opposite to each other along a first direction X. The first clamping member 10 and the second clamping member 20 are both provided with an escape portion 101. The escape portion 101 penetrates the first clamping member 10 and the second clamping member 20 along the first direction X. The first clamping member 10 and the second clamping member 20 are configured to clamp the flexible packaging film 202 at least at both ends of the battery cell 200 along a second direction Y. The escape portion 101 is configured so that its projection along the first direction X completely covers the electrode assembly 201. The second direction Y intersects with the first direction X.

[0056] The clamp 100 is intended to improve the overall rigidity of the outer surface of the battery cell 200 by clamping the battery cell 200, thereby enabling the battery cell 200 to adapt to changes in external pressure during the isostatic pressing process and reducing the risk of damage to the battery cell 200 under external pressure.

[0057] In these embodiments of the present application, the isostatic pressing process may be a cold isostatic pressing process, a warm isostatic pressing process, or a hot isostatic pressing process.

[0058] The clamp 100 includes a first clamping member 10 and a second clamping member 20 arranged opposite to each other along a first direction X, wherein the first clamping member 10 and the second clamping member 20 are specific components in the clamp 100 that come into contact with the battery cell 200 and clamp the battery cell 200 to improve the rigidity of the outer surface of the battery cell 200.

[0059] The first clamping member 10 and the second clamping member 20 are arranged relative to each other along the first direction X. This means that the first direction X is the arrangement direction of the first clamping member 10 and the second clamping member 20. Furthermore, the first direction X may also be the clamping direction of the first clamping member 10 and the second clamping member 20. In other words, at least one of the first clamping member 10 and the second clamping member 20 can move along the first direction X to change the distance between them and clamp the battery cell 200 disposed therebetween.

[0060] The first clamping member 10 and the second clamping member 20 are both provided with a hollowed-out avoidance portion 101. In a possible embodiment, the avoidance portion 101 may be a through-slot structure or a through-hole structure that penetrates the first clamping member 10 and the second clamping member 20 along the first direction X. In these embodiments of the present application, the avoidance portion 101 structures on the first clamping member 10 and the second clamping member 20 may be directly formed by one-piece stamping, one-piece injection molding, or the like. Alternatively, after the integral structure of the first clamping member 10 or the second clamping member 20 is formed, cutting or grinding may be performed on the first clamping member 10 and the second clamping member 20, respectively, to form the aforementioned hollowed-out avoidance portion 101 structures.

[0061] The first clamping member 10 and the second clamping member 20 are configured to clamp the flexible packaging film 202 at least at two ends of the battery cell 200 along the second direction Y. This means that if the battery cell 200 is a rectangular structure, the relative arrangement direction of any opposite side of the battery cell 200 can be the second direction Y.

[0062] By providing the first clamping member 10 and the second clamping member 20 to clamp the flexible packaging film 202 at least at both ends of the battery cell 200 along the second direction Y, the first clamping member 10 and the second clamping member 20 are used to clamp the flexible packaging film 202 along the aforementioned opposite side directions, thereby allowing the flexible packaging film 202 to be stretched and pressed against the outer surface of the electrode assembly 201. This tensioning force of the flexible packaging film 202 further enhances the outer surface rigidity of the electrode assembly 201. During the subsequent isostatic pressing process, the battery cell 200 with a greater outer surface rigidity can withstand pressure changes and maintain structural integrity, thereby reducing the risk of structural deformation or even damage to the battery cell 200 due to pressure changes during the isostatic pressing process.

[0063] The relief portion 101 is configured so that its projection along the first direction X completely covers the electrode assembly 201. This means that the relief portion 101 is used to avoid the electrode assembly 201 in the battery cell 200 when the first clamping member 10 and the second clamping member 200 clamp the battery cell 200. That is, the first clamping member 10 and the second clamping member 200 clamp the battery cell 200 only by clamping the flexible packaging film 202 and do not come into contact with the electrode assembly 201. This reduces the impact of the clamp 100 on the outer surface of the battery cell 200 during the isostatic pressing process, ensuring uniform pressure across all locations on the outer surface of the battery cell 200 during the isostatic pressing process. This reduces the impact of the clamp 100 on the isostatic pressing process and improves the reliability of the isostatic pressing of the battery cell 200.

[0064] The projection of the avoidance portion 101 along the first direction X completely covers the electrode assembly 201, which means that the projection area of ​​the electrode assembly 201 in the first direction X is smaller than the projection area of ​​the avoidance portion 101 in the first direction X. At the same time, in the first direction X, the projection of the electrode assembly 201 completely falls within the projection of the avoidance portion 101, so as to further reduce the possibility of the clamp 100 affecting the battery cell 200 during the isostatic pressing process.

[0065] At the same time, since the avoidance portion 101 passes through the first clamping member 10 and the second clamping member 20 along the first direction X, after the battery cell 200 is clamped by the clamp 100, the electrode assembly 201 can contact the external space through the avoidance portion 101 on the first clamping member 10 and the second clamping member 20. In the subsequent isostatic pressing process, the isostatic pressing medium can uniformly contact the outer surface of the electrode assembly 201 through the avoidance portion 101, thereby achieving the effect of uniformly applying pressure to the outer surface of the electrode assembly 201.

[0066] In these embodiments of the present application, the avoidance portion 101 passes through the first clamping member 10 and the second clamping member 20 along the first direction X. In a possible implementation, the first clamping member 10 and the second clamping member 20 are both plate-shaped structures, and the avoidance portion 101 is a through-groove or through-hole structure provided on the first clamping member 10 and the second clamping member 20; or, in some embodiments, the first clamping member 10 or the second clamping member 20 can be a split structure. Taking the first clamping member 10 as an example, the first clamping member 10 can be composed of multiple components, and the multiple components are spaced apart on a plane perpendicular to the first direction X, and the avoidance portion 101 is formed between the multiple components. In other words, the first clamping member 10 or the second clamping member 20 can each be a one-piece structure or a split structure composed of multiple components.

[0067] In the technical solution of the embodiment of the present application, the first clamping member 10 and the second clamping member 20 are designed to be provided with a hollow avoidance portion 101, and the first clamping member 10 and the second clamping member 20 are used to jointly clamp the flexible packaging film 202 of the battery cell 200. The clamping force of the first clamping member 10 and the second clamping member 20 on the flexible packaging film 202 is increased, and the tension of the flexible packaging film 202 on the electrode assembly 201 is increased, which can improve the overall stiffness of the outer surface of the electrode assembly 201, thereby improving the reliability of the battery cell 200 during the isostatic pressing process. At the same time, the first clamping member 10 and the second clamping member 20 indirectly clamp the electrode assembly 201 through the flexible packaging film 202, which can reduce the influence of the clamp 100 on the isostatic pressing, improve the uniformity of the pressure at various positions on the outer surface of the electrode assembly 201 during the isostatic pressing process, and is conducive to improving the effect of the isostatic pressing treatment.

[0068] In some embodiments, the first clamping member 10 includes two clamping plates 11 arranged opposite to each other along the second direction Y. The surfaces of the two clamping plates 11 close to the second clamping member 20 along the first direction X are located in the same plane, and the second direction Y intersects with the first direction X. The two clamping plates 11 are configured to cooperate with the second clamping member 20 on opposite sides of the battery cell 200 to clamp the flexible packaging film 202.

[0069] The clamping plate 11 is the component of the first clamping member 10 that actually contacts the battery cell 200 and cooperates with the second clamping member 20 to clamp the battery cell 200. The surfaces of the two clamping plates 11 proximal to the second clamping member 20 along the first direction X are coplanar, enhancing the parallelism of the clamping surfaces of the two clamping plates 11 and further improving the clamping effect of the first clamping member 10 and the second clamping member 20 on the battery cell 200.

[0070] The first clamping member 10 includes two clamping plates 11 arranged opposite to each other along the second direction Y. A possible implementation method is that the two clamping plates 11 adopt a split structure and are molded separately. During the assembly process of the clamp 100, the two clamping plates 11 are driven by different driving mechanisms respectively to move the clamping plates 11 in the direction close to or away from the second clamping member 20 to achieve clamping or loosening of the battery cell 200; in some embodiments, the two clamping plates 11 can also be formed separately, and during the assembly process of the clamp 100, the two clamping plates 11 are connected into a whole through an external connecting member, and then the two clamping plates 11 formed as a whole are driven by a driving mechanism; in some embodiments, the two clamping plates 11 and the connecting member between them can also be directly formed as one piece to improve the structural consistency between the two clamping plates 11.

[0071] The two clamping plates 11 are configured to engage with the second clamping member 20 on opposite sides of the battery cell 200 to clamp the flexible packaging film 202. This means that the two clamping plates 11 are respectively arranged on opposite sides of the battery cell 200 and can engage with the second clamping member 20 and clamp the flexible packaging film 202 by moving along the first direction X. Under the action of the clamping force, the flexible packaging film 202 is stretched and tensioned along the direction in which the two clamping plates 11 are arranged relative to each other (the second direction Y), thereby increasing the tension on the outer surface of the electrode assembly 201.

[0072] It is understood that in order to enhance the comprehensiveness of the rigidity of the outer surface of the electrode assembly 201 after the flexible packaging film 202 is stretched, the extension length of the two clamping plates 11 in the third direction Z can be greater than the projection length of the battery cell 200 in the second direction Y along the third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other. In this way, the two clamping plates 11 can cover the entirety of the flexible packaging film 202 along the third direction Z on both sides of the battery cell 200 along the second direction Y, fully clamping the flexible packaging film 202. This allows the stretched and tensioned portions of the flexible packaging film 202 and the electrode assembly 201 to cover the entire surface of the electrode assembly 201 along the first direction X, thereby uniformly enhancing the surface rigidity of both ends of the electrode assembly 201 along the first direction X and facilitating subsequent isostatic pressing.

[0073] At the same time, in these embodiments of the present application, since the first clamping member 10 can be composed of only two clamping plates 11, the structural size of the first clamping member 10 can be reduced, which is conducive to the miniaturized design of the clamp 100 itself, and thus adaptable to isostatic pressing devices of more sizes.

[0074] In some embodiments, at least one of the two clamping plates 11 is movable along the second direction Y.

[0075] The clamping plate 11 can move along the second direction Y, that is, the distance between the two clamping plates 11 can change. In this way, it can adapt to the size changes of the battery cell 200 during the isostatic pressing process, reduce the further tearing of the flexible packaging film 202 due to being clamped by the clamp 100 when the battery cell 200 changes in size, and reduce the risk of the flexible packaging film 202 being torn and causing the isostatic pressing medium to contact the electrode assembly 201.

[0076] At least one of the two clamps 11 can move along the second direction Y. A possible implementation method is that the position of one of the two clamps 11 in the second direction Y is fixed, such as the clamp 11 can be connected to a guide rod extending along the first direction X, so that the clamp 11 can move back and forth along the first direction X without changing its position in the second direction Y; in some embodiments, both clamps 11 can also be arranged to move along the second direction Y to further increase the adjustment sensitivity of the distance between the two clamps 11 along the second direction Y.

[0077] In some embodiments, the first clamping member 10 further includes an elastic member 12 disposed along the second direction Y. The elastic member 12 is disposed between the two clamping plates 11 and is respectively connected to the two clamping plates 11 .

[0078] The elastic member 12 is arranged between the two splints 11 and is respectively connected to the two splints 11. A possible implementation method is that the two ends of the elastic member 12 are directly connected to the two splints 11 respectively, or in some embodiments, the splint 11 can also be provided with an extension structure in the first direction X, and the elastic member 12 can be connected between the extension structures of the two splints 11 in the first direction X.

[0079] In this way, after the first clamping member 10 is assembled, the two clamps 11 can be connected by the elastic member 12 to improve the structural consistency between the two clamps 11. When the clamp 100 is in a non-working state or after clamping the battery cell 200 and before being placed in the isostatic pressing device, the elastic member 12 can limit the spacing between the two clamps 11 in the second direction Y.

[0080] At the same time, after the clamp 100 clamps the battery cell 200 and places them together in the isostatic pressing device, the elastic member can adapt to the pressure applied to the clamping plates 11, so that the distance between the two clamping plates 11 can be reduced as the battery cell 200 is compressed. This can reduce the risk of the electrode assembly 201 and the clamp 100 jointly tearing the flexible packaging film 202 due to the compression of the electrode assembly 201 after the clamp 100 clamps the flexible packaging film 202. This can improve the structural integrity of the flexible packaging film 202 during the isostatic pressing process and reduce the risk of the isostatic pressing medium contacting the electrode assembly 201 due to damage to the flexible packaging film 202. Moreover, when the external pressure gradually disappears, the two clamping plates can also automatically return to their original position under the action of the elastic member, further improving the reliability of the clamp.

[0081] In some embodiments, there are multiple elastic members 12 , and each elastic member 12 is configured so that its projection along the first direction X is offset from the electrode assembly 201 .

[0082] The number of elastic members 12 is set to be multiple, which can reduce the stiffness requirement of a single elastic member 12 and provide more possibilities for the material selection of the elastic member 12. For example, in these embodiments of the present application, the elastic member 12 can be, but is not limited to, set to be a spring with a relatively high stiffness made of alloy steel, ceramic, or the like.

[0083] Each elastic member 12 is configured so that its projection along the first direction X is offset from the electrode assembly 201. Specifically, the elastic members 12 are concentrated at both ends of the clamping plate 11, forming a rectangular structure with the two clamping plates 11. Thus, by arranging each elastic member 12 so that it is offset from the electrode assembly 201 along the first direction X, when the first clamping member 10 and the second clamping member 20 clamp the battery cell 200, each elastic member 12 will not come into contact with the electrode assembly 201. This reduces the risk of interference between the elastic members 12 and the electrode assembly 201, thereby further improving the reliability of the clamp 100.

[0084] In some embodiments, the number of the elastic member 12 is at least one, and the stiffness K of the elastic member 12 along the second direction Y satisfies the following formula:

[0085]

[0086] Wherein, f is the pressure exerted on a single elastic member 12 during the isostatic pressing process, L is the initial length of the elastic member 12, N is the number of elastic members 12, and I is the amount of contraction of the elastic member 12 during the isostatic pressing process.

[0087] When there is only one elastic member 12, the stiffness of the elastic member 12 can be calculated by the ratio of the resultant force exerted on the two clamping plates 11 during the isostatic pressing process to the contraction force of the spring during the isostatic pressing process, that is, K=f / (I / L)=fL / I. When the number of elastic members 12 is set to multiple, the calculation formula for the stiffness K of a single elastic member 12 is fL / NI.

[0088] Among them, the pressure f exerted on a single elastic part 12 during the isostatic pressing process can be calculated by the number of elastic parts 12, the pressure of the isostatic pressing device and the area size of the clamp 11 in the second direction Y. The initial length L of the elastic part 12 can be calculated by measurement, and the shrinkage amount of the elastic part 12 during the isostatic pressing process can be regarded as the shrinkage amount of the electrode assembly 201 in the second direction Y during the isostatic pressing process.

[0089] In this way, by measuring the pressure f exerted on a single elastic member 12 during the isostatic pressing process, the initial length L of the elastic member 12 (the distance between the two clamps in the second direction), and the amount of shrinkage of the elastic member 12 during the isostatic pressing process, the appropriate stiffness of the single elastic member 12 can be calculated, which is conducive to selecting the stiffness of the clamp 100 before the production of the clamp 100, making the clamp 100 more adapted to the isostatic pressing requirements, and further improving the reliability of the clamp 100.

[0090] In some embodiments, the first direction X is configured to be perpendicular to a large surface of the battery cell 200 .

[0091] In these embodiments of the present application, since the structure of a solid-state battery cell is generally a thin flat plate structure whose length and width are much greater than its thickness, by configuring the first direction X to be perpendicular to the large surface of the battery cell 200, that is, the clamping direction of the clamp 100 is perpendicular to the large surface of the battery cell 200, it is beneficial to the arrangement of the clamp 100 and can utilize the flexible packaging film 202 to tension a larger area of ​​the outer surface of the electrode assembly 201, thereby improving the stiffness of the outer surface of the electrode assembly 201 and further improving the reliability of the isostatic pressing process.

[0092] In some embodiments, in the second direction Y, each clamping plate 11 is configured to have a maximum spacing of 2 mm to 5 mm from the electrode assembly 201 .

[0093] The distance between the splint 11 and the electrode assembly 201 in the second direction Y is the distance between the splint 11 and the electrode assembly 201 after the clamp 100 clamps the battery cell 200. When the distance between the splint 11 and the electrode assembly 201 is too small, in the process of the clamp 100 gradually clamping, the splint 11 can cooperate with the electrode assembly 201 to form a large shear force, which can easily damage the flexible packaging film 202; and when the distance between the splint 11 and the electrode assembly 201 is too large, it may be difficult to tighten the flexible packaging film 202 after the clamp 100 is clamped, resulting in limited improvement in the stiffness of the outer surface of the battery cell 200.

[0094] For example, in these embodiments of the present application, each clamping plate 11 may be configured to have a maximum spacing of 3 mm or 4 mm from the electrode assembly 201 in the second direction Y, but is not limited to being configured to accommodate battery cells 200 of different sizes.

[0095] It should be noted that the distance between the clamp 11 and the electrode assembly 201 in the second direction Y can be regarded as the distance between the side surface of the first clamp 10 or the second clamp 20 close to the avoidance portion 101 and the electrode assembly 201, that is, in the second direction Y, the maximum distance between the surface of the first clamp 10 or the second clamp 20 close to the avoidance portion 101 and the electrode assembly 201 is controlled between 2 mm and 5 mm.

[0096] In some embodiments, the dimension of each clamping plate 11 in the second direction Y is 2 mm to 5 mm.

[0097] By controlling the size of each clamp 11 in the second direction Y to be 2mm to 5mm, the clamp 11 can obtain a sufficient contact area with the second clamp 20 in the first direction X, and then after the first clamp 10 and the second clamp 20 are clamped, sufficient friction can be obtained, thereby reducing the risk of the flexible packaging film 202 sliding again after the clamp 100 clamps the flexible packaging film 202.

[0098] For example, the dimension of each clamping plate 11 in the second direction Y may be, but is not limited to, 3 mm or 4 mm.

[0099] In some embodiments, the dimensions of each splint 11 in the first direction X are 1 mm to 3 mm. This design can improve the rigidity of the splint 11 itself, enhance the reliability of the splint 11 during the isostatic pressing process, and reduce the risk of the splint 11 bending or breaking during the isostatic pressing process.

[0100] For example, in these embodiments of the present application, the size of the clamping plate 11 in the first direction X may be, but is not limited to, set to 1.5 mm, 2.0 mm, or 2.5 mm.

[0101] In some embodiments, the clamp 100 includes two flexible tension membranes (not shown), which are respectively connected to the first clamping member 10 and the second clamping member 20 , and in the first direction X, the projection of the avoidance portion 101 completely falls within the flexible tension membranes.

[0102] The flexible tensioning membrane is part of the clamp 100 and is used to gradually come into contact with the battery cell 200 during the gradual clamping process of the first clamping member 10 and the second clamping member 20. The two flexible tensioning membranes clamp the battery cell 200 at both ends of the first direction X.

[0103] In these embodiments of the present application, the material of the flexible tension film may be one of aluminum-plastic film, polyethylene film, and polypropylene film.

[0104] The two flexible tensioning membranes are respectively connected to the first clamping member 10 and the second clamping member 20, and in the first direction X, the projection of the avoidance portion 101 falls completely within the flexible tensioning membrane. A possible implementation method is that the two flexible tensioning membranes can be connected to the surfaces of the first clamping member 10 and the second clamping member 20 close to the avoidance portion 101. Since the avoidance portion 101 is the part of the first clamping member 10 and the second clamping member 20 used to avoid the electrode assembly 201, in these embodiments of the present application, the flexible tensioning membrane can clamp the surfaces of the electrode assembly 201 at both ends of the first direction X when the first clamping member 10 and the second clamping member 20 gradually approach each other along the first direction X, thereby improving the outer surface stiffness of the electrode assembly 201.

[0105] In some embodiments, the flexible tensioning membrane can also be connected to the surfaces opposite to the first clamping member 10 and the second clamping member 20, and completely cover the avoidance portion 101 in the first direction X. Similarly, when the first clamping member 10 and the second clamping member 20 gradually approach each other along the first direction X, the surfaces of the electrode assembly 201 at both ends of the first direction X can be clamped.

[0106] In these embodiments of the present application, the first clamping member 10 and the second clamping member 20 respectively drive the two flexible tensioning films to clamp the battery cell 200 along the first direction X, so that the dimensional accuracy requirements of the first clamping member 10 and the second clamping member 20 can be reduced. At this time, it is only necessary to configure the avoidance portion 101 on the first clamping member 10 and the second clamping member 20 to cover the electrode assembly 201 in the first direction X, without worrying about whether the first clamping member 10 and the second clamping member 20 clamp the flexible packaging film 202 of the battery cell 200, and without worrying about whether the flexible packaging film 202 will slide relative to the first clamping member 10 or the second clamping member 20 due to the action of pressure, which is beneficial to improving the production efficiency and work efficiency of the clamp.

[0107] In some embodiments, the fixture 100 further includes a buffer member 40, which is disposed on a surface of the first clamping member 10 close to the second clamping member 20, and / or a surface of the second clamping member 20 close to the first clamping member 10; and the buffer member 40 is configured to at least partially overlap with the flexible packaging film 202 in its projection along the first direction X.

[0108] By arranging a buffer member 40 on the surfaces opposite to the first clamping member 10 and the second clamping member 20, a buffering effect can be played during the clamping process of the first clamping member 10 and the second clamping member 20, thereby reducing the risk of the first clamping member 10 and the second clamping member 20 damaging the flexible packaging film 202. At the same time, the buffer member 40 can also increase the friction between the first clamping member 10 and the second clamping member 20 and the flexible packaging film 202, thereby helping to improve the tensioning effect of the flexible packaging film 202.

[0109] The material of the buffer 40 can be but is not limited to rubber or silicone, and the shape of the buffer 40 can be adapted to the surface shape of the first clamping member 10 and the second clamping member 20 facing each other along the first direction X, that is, when the cross-sectional shape of the first clamping member 10 (or its components) in the first direction X is rectangular, the cross-sectional shape of the buffer 40 in the first direction X can be set to be rectangular; when the cross-sectional shape of the first clamping member 10 in the first direction X is arc-shaped, the cross-sectional shape of the buffer 40 in the first direction X can be set to be a matching arc-shaped.

[0110] The buffer member 40 is configured so that its projection along the first direction X at least partially overlaps with the flexible packaging film 202, so as to utilize the buffer member 40 as the component in the clamp 100 that actually contacts the battery cell 200. Since the buffer member 40 itself can be deformed under pressure, the buffer member 40 can increase the contact area with the flexible packaging film 202 after being squeezed, thereby improving the clamping effect of the clamp 100 on the flexible packaging film 202.

[0111] In some embodiments, the clamp 100 further includes a connecting member 50 , which is connected to the first clamping member 10 and the second clamping member 20 respectively; the connecting member 50 is configured to be retractable along the first direction X.

[0112] In a possible implementation, the connecting member 50 is disposed between the first clamping member 10 and the second clamping member 20 along the first direction X, which means that the connecting member 50 is used to connect the first clamping member 10 and the second clamping member 20 to improve the structural consistency of the clamp 100 .

[0113] In some embodiments, two ends of the connecting member 50 along the first direction X may be respectively connected to the surfaces of the first clamping member 10 and the second clamping member 20 facing away from the avoiding portion 101 .

[0114] The connecting member 50 is configured to be retractable along the first direction X. The retraction of the connecting member 50 along the first direction X can drive the distance between the first clamping member 10 and the second clamping member 20 in the first direction X to change, thereby achieving the clamping and loosening of the battery cell 200.

[0115] In these embodiments of the present application, the connecting member 50 can be set as a telescopic rod structure with a driving mechanism, and the driving mechanism can drive the telescopic rod to extend and retract in the first direction X, thereby driving the distance between the first clamping member 10 and the second clamping member 20 in the first direction X to change.

[0116] In these embodiments of the present application, the structural consistency of the first clamping member 10 and the second clamping member 20 is improved by the connecting member 50, and the distance between the first clamping member 10 and the second clamping member 20 in the first direction X and the magnitude of the preload force applied to the flexible packaging film 202 can be controlled.

[0117] In some embodiments, there are multiple connecting members 50 , and the multiple connecting members 50 are evenly distributed along the periphery of the first clamping member 10 or the second clamping member 20 .

[0118] Multiple connecting members 50 are evenly distributed along the periphery of the first clamping member 10 or the second clamping member 20 to form support evenly around the periphery of the first clamping member 10 and the second clamping member 20, which can further improve the structural stability of the clamp 100. At the same time, the synchronous extension and contraction of multiple connecting members 50 can also effectively improve the stability of the first clamping member 10 or the second clamping member 20 when moving along the first direction X, and improve the parallelism between the first clamping member 10 and the second clamping member 20.

[0119] For example, in these embodiments of the present application, the number of connecting members 50 can be set to four, wherein two connecting members 50 are arranged between the two ends of one clamp 11 along the third direction Z and the second clamp 20, and the other two connecting members 50 are arranged between the two ends of another clamp 11 along the third direction Z and the second clamp 20.

[0120] According to the clamp 100 provided in the embodiment of the present application, the balance of the first clamp 10 or the second clamp 20 when moving along the first direction X can be improved, which is beneficial to improving the parallelism between one of the first clamp 10 or the second clamp 20 and the other when moving, and further beneficial to improving the clamping effect of the clamp 100.

[0121] In some embodiments, the second clamping member 20 and the first clamping member 10 are symmetrically arranged along a plane perpendicular to the first direction X.

[0122] That is, the structure of the second clamping member 20 is consistent with that of the first clamping member 10, and the second clamping member 20 also includes two clamping plates and an elastic member between the two clamping plates. This setting method unifies the structure of the first clamping member 10 and the second clamping member 20, and does not require the design of two additional sets of molds, which is conducive to improving the production efficiency and economy of the clamp 100.

[0123] An embodiment of the present application further provides an isostatic pressing device, which includes the clamp 100 provided in any of the aforementioned embodiments.

[0124] It should be noted that the isostatic pressing device usually also includes a pressure vessel, a boosting system and a temperature control system. When the battery cell 200 is subjected to isostatic pressing, the battery cell 200 is usually clamped by a clamp 100 to increase the outer surface stiffness of the battery cell 200. The battery cell 200 and the clamp 100 are then placed in a pressure vessel filled with an isostatic pressing medium. After the pressure vessel is sealed and tightened, the pressure and temperature of the isostatic pressing medium are adjusted by the boosting system and the temperature control system so that the medium acts evenly on the outer surface of the battery cell 200 through the hollow area in the clamp 100 (the space corresponding to the avoidance portion 101). Since the isostatic pressing medium is incompressible and follows Pascal's principle, the six sides of the battery cell are subjected to isotropic and uniform ultra-high pressure, causing micron-level plastic deformation at the positive electrode / solid electrolyte / negative electrode interface.

[0125] In these embodiments of the present application, since the clamp 100 does not directly act on the electrode assembly 201 when clamping the battery cell 200, it instead clamps the flexible packaging film 202 of the battery cell 200 and tensions the electrode assembly 201 through the flexible packaging film 202. While improving the stiffness of the outer surface of the electrode assembly 201, it can also improve the uniformity of the pressure applied to various parts of the outer surface of the battery cell 200 during isostatic pressing treatment, further improving the isostatic pressing effect of the battery cell 200.

[0126] An embodiment of the present application further provides a battery production device, which includes the isostatic pressing device provided in any of the aforementioned embodiments.

[0127] According to some embodiments of this application, please refer to Figures 1 to 5 An embodiment of the present application provides a clamp 100 for clamping a battery cell 200. The battery cell 200 includes an electrode assembly 201 and a flexible packaging film 202 that encapsulates the electrode assembly 201. The clamp 100 includes a first clamping member 10 and a second clamping member 20 that are arranged opposite to each other along a first direction X, a flexible tensioning membrane, a buffer member 40, and a connecting member 50. The first clamping member 10 and the second clamping member 20 are both provided with an avoidance portion 101. The first clamping member 10 and the second clamping member 20 are configured to clamp the flexible packaging film 202 at least at both ends of the battery cell 200 along a second direction Y. The avoidance portion 101 is configured so that its projection along the first direction X completely covers the electrode assembly 201.

[0128] The clamp 100 is intended to improve the overall rigidity of the outer surface of the battery cell 200 by clamping the battery cell 200, thereby enabling the battery cell 200 to adapt to changes in external pressure during the isostatic pressing process and reducing the risk of damage to the battery cell 200 under external pressure.

[0129] Both the first clamping member 10 and the second clamping member 20 are provided with a hollowed-out relief portion 101. The first clamping member 10 and the second clamping member 20 are configured to clamp the flexible packaging film 202 at least at both ends of the battery cell 200 along the second direction Y. The clamping action of the first clamping member 10 and the second clamping member 20 stretches the flexible packaging film 202 along the aforementioned opposite side directions, thereby allowing the flexible packaging film 202 to be tensioned and pressed against the outer surface of the electrode assembly 201. This tensioning force of the flexible packaging film 202 increases the outer surface stiffness of the electrode assembly 201. During the subsequent isostatic pressing process, the battery cell 200 with a greater outer surface stiffness can withstand pressure changes and maintain structural integrity, reducing the risk of structural deformation or even damage to the battery cell 200 due to pressure changes during the isostatic pressing process.

[0130] The arrangement of the relief portion 101 allows the electrode assembly 201 in the battery cell 200 to be avoided when the first clamping member 10 and the second clamping member 20 are clamping the battery cell 200. That is, the first clamping member 10 and the second clamping member 20 only clamp the battery cell 200 by clamping the flexible packaging film 202, without contacting the electrode assembly 201. This reduces the impact of the clamp 100 on the outer surface of the battery cell 200 during the isostatic pressing process, ensuring uniform pressure across all locations on the outer surface of the battery cell 200 during the isostatic pressing process. This reduces the impact of the clamp 100 on the isostatic pressing process and improves the reliability of the isostatic pressing process for the battery cell 200.

[0131] In these embodiments of the present application, there are two flexible tensioning films, which are respectively connected to the first clamping member 10 and the second clamping member 20, and in the first direction X, the flexible tensioning film overlaps with the avoidance portion 101. At this time, it is only necessary to configure the avoidance portion 101 on the first clamping member 10 and the second clamping member 20 to cover the electrode assembly 201 in the first direction X, without worrying about whether the first clamping member 10 and the second clamping member 20 clamp the flexible packaging film 202 of the battery cell 200, and without worrying about whether the flexible packaging film 202 will slide relative to the first clamping member 10 or the second clamping member 20 due to the action of pressure, which is beneficial to improving the production efficiency and work efficiency of the clamp.

[0132] The buffer member 40 is arranged on the surface of the first clamping member 10 close to the second clamping member 20, and / or, the buffer member 40 is arranged on the surface of the second clamping member 20 close to the first clamping member 10; and the buffer member 40 is configured to have a projection along the first direction X at least partially overlap with the flexible packaging film 202.

[0133] By arranging a buffer member 40 on the surfaces opposite to the first clamping member 10 and the second clamping member 20, a buffering effect can be played during the clamping process of the first clamping member 10 and the second clamping member 20, thereby reducing the risk of the first clamping member 10 and the second clamping member 20 damaging the flexible packaging film 202. At the same time, the buffer member 40 can also increase the friction between the first clamping member 10 and the second clamping member 20 and the flexible packaging film 202, thereby helping to improve the tensioning effect of the flexible packaging film 202.

[0134] The connecting member 50 is disposed between the first clamping member 10 and the second clamping member 20 along the first direction X. The connecting member 50 is configured to be telescopic along the first direction X. In these embodiments of the present application, the connecting member 50 can be configured as a telescopic rod structure with a driving mechanism. The driving mechanism can drive the telescopic rod to extend and retract in the first direction X, thereby causing the spacing between the first clamping member 10 and the second clamping member 20 in the first direction X to change.

[0135] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0136] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A clamp for clamping a battery cell, wherein the battery cell comprises an electrode assembly and a flexible packaging film for packaging the electrode assembly, characterized in that: The fixture comprises: A first clamping member and a second clamping member are arranged opposite to each other along a first direction, and each of the first clamping member and the second clamping member is provided with an avoidance portion, and the avoidance portion passes through the first clamping member and the second clamping member along the first direction, and the first clamping member and the second clamping member are configured to clamp the flexible packaging film at least at both ends of the battery cell along the second direction, and the avoidance portion is configured to completely cover the electrode assembly along the projection of the first direction, and the second direction intersects with the first direction.

2. The clamp according to claim 1, characterized in that The first clamping member includes two clamping plates arranged opposite to each other along the second direction, and surfaces of the two clamping plates close to the second clamping member along the first direction are in the same plane; The two clamping plates are configured to cooperate with the second clamping member at opposite sides of the battery cell, respectively, to clamp the flexible packaging film.

3. The clamp according to claim 2, characterized in that At least one of the two clamping plates is movable along the second direction.

4. The clamp according to claim 2, characterized in that The first clamping member further includes an elastic member arranged along the second direction, wherein the elastic member is arranged between the two clamping plates and is respectively connected to the two clamping plates.

5. The clamp according to claim 4, characterized in that There are a plurality of elastic members, and each of the elastic members is configured so that its projection along the first direction is offset from the electrode assembly.

6. The clamp according to claim 4, characterized in that The number of the elastic member is at least one, and the stiffness K of the elastic member along the second direction satisfies the following formula: Wherein, f is the pressure exerted on a single elastic member during the isostatic pressing process, L is the initial length of the elastic member, N is the number of the elastic members, and I is the amount of contraction of the elastic member during the isostatic pressing process.

7. The clamp according to claim 2, characterized in that The first direction is configured to be perpendicular to a large surface of the battery cell.

8. The clamp according to claim 7, characterized in that In the second direction, each of the clamping plates is configured to have a maximum distance from the electrode assembly of 2 mm to 5 mm.

9. The clamp according to claim 7, characterized in that The size of each of the splints in the second direction is 2 mm to 5 mm; and / or the size of each of the splints in the first direction is 1 mm to 3 mm.

10. The clamp according to claim 1, wherein The clamp includes two flexible tensioning films, which are respectively connected to the first clamping member and the second clamping member. In the first direction, the projection of the avoidance portion completely falls within the flexible tensioning films.

11. The clamp according to claim 1, wherein: The clamp further includes a buffer member, the buffer member is provided on a surface of the first clamp member close to the second clamp member, and / or the buffer member is provided on a surface of the second clamp member close to the first clamp member; The buffer member is configured such that a projection along the first direction at least partially overlaps with the flexible packaging film.

12. The clamp according to claim 1, wherein The clamp further includes a connecting member, wherein the connecting member is connected to the first clamping member and the second clamping member respectively; The connecting member is configured to be telescopic along the first direction.

13. The clamp according to any one of claims 1 to 12, characterized in that The second clamping member and the first clamping member are symmetrically arranged along a plane perpendicular to the first direction.

14. An isostatic pressing device, characterized in that: Comprising the clamp according to any one of claims 1 to 13.

15. A battery production device, characterized in that: Comprising the isostatic pressing apparatus as claimed in claim 14.

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