Clamp, isostatic pressing device and battery production equipment

Abstract

The application relates to a clamp, an isostatic pressing device and a battery production equipment, and belongs to the technical field of battery production. The clamp is used for clamping a battery monomer. The battery monomer 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 along a first direction. The first clamping piece and the second clamping piece are both provided with a relief portion which penetrates the first clamping piece and the second clamping piece along the first direction. The first clamping piece and the second clamping piece are configured to clamp the flexible packaging film at least at one opposite side of the battery monomer. The relief portion is configured to completely cover the electrode assembly in the projection along the first direction. The clamp, the isostatic pressing device and the battery production equipment provided by the application aim to improve the rigidity of the outer surface of the battery monomer and improve the uniformity of the effect of isostatic pressing at various positions of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a clamp, an isostatic pressing device, and battery manufacturing equipment. Background Technology

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

[0003] Solid-state batteries are batteries that use solid electrodes and solid electrolytes. Isostatic pressing technology is one of the key technologies for manufacturing 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 under high pressure with uniform force.

[0004] However, in related technologies, the fixture usually acts directly on the surface of the electrode assembly, affecting the uniformity of 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, this application provides a fixture, an isostatic pressing device, and a battery production equipment, which can improve the uniformity of the isostatic pressing effect at various positions of the battery cell while increasing the outer surface stiffness of the battery cell.

[0006] In a first aspect, embodiments of this application provide a clamp for clamping a battery cell, the battery cell including an electrode assembly and a flexible encapsulation film for encapsulating the electrode assembly, the clamp including a first clamping member and a second clamping member disposed opposite to each other along a first direction, both the first clamping member and the second clamping member being provided with a clearance portion, the clearance portion penetrating through the first clamping member and the second clamping member along the first direction, the first clamping member and the second clamping member being configured to clamp the flexible encapsulation film at least at both ends of the battery cell along a second direction, the clearance portion being configured to completely cover the electrode assembly along the projection of the first direction, the second direction intersecting the first direction.

[0007] In the technical solution of this application embodiment, both the first clamping member and the second clamping member are designed with a clearance portion, and the clearance portion penetrates through the first clamping member and the second clamping member along a first direction. The first clamping member and the second clamping member jointly clamp the flexible encapsulation film of the battery cell, while the clearance portion avoids the electrode assembly along the first direction. The clamping force of the first clamping member and the second clamping member on the flexible encapsulation film increases the tension force of the flexible encapsulation film on the electrode assembly. This can improve the overall rigidity 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 encapsulation film, which can reduce the influence of the clamp on the isostatic pressing and improve the uniformity of pressure on various positions on the outer surface of the electrode assembly during the isostatic pressing process, which is beneficial to improving the effect of isostatic pressing.

[0008] In some embodiments, the first clamping member includes two clamping plates disposed opposite each other along a second direction, the surfaces of the two clamping plates approaching the second clamping member along a first direction being on the same plane; the two clamping plates are configured to engage with the second clamping member at opposite sides of the battery cell to clamp the flexible encapsulation film. The clamping of the flexible encapsulation film from opposite sides of the battery cell by the two clamping plates can enhance the overall rigidity of the outer surface of the electrode assembly using the flexible encapsulation film, and the arrangement of the two clamping plates simplifies the structure of the first clamping member, facilitating the miniaturization design of the clamp itself, and thus adapting to isostatic pressing devices of more sizes.

[0009] In some embodiments, at least one of the two clamps is movable in a second direction. This design can accommodate the dimensional constraints that occur in the electrode assembly during isostatic pressing, reducing the stretching of the flexible encapsulation film caused by the dimensional constraints of the electrode assembly during isostatic pressing, thereby reducing the risk of damage to the flexible encapsulation film during isostatic pressing and further improving the reliability of the clamp.

[0010] In some embodiments, the first clamping member further includes an elastic element disposed along a second direction, which is located between the two clamping plates and connected to each of the two clamping plates respectively. This design can improve the overall integrity of the two clamping plates by utilizing the elastic element, while limiting the spacing between the two second clamping plates along the second direction. This allows the two clamping plates to move towards each other under external pressure (during isostatic pressing) to accommodate the size reduction of the electrode assembly. Furthermore, as the external pressure gradually disappears, the two clamping plates can automatically return to their original position under the action of the elastic element, further improving the reliability of the clamp.

[0011] In some embodiments, there are multiple elastic elements, and each elastic element is configured to be misaligned with the electrode assembly in the projection along a first direction. By configuring the elastic elements to be misaligned with the electrode assembly in the projection along the first direction, the risk of interference between the elastic elements and the electrode assembly can be reduced after the first clamping member and the second clamping member are clamped, thereby further improving the reliability of the fixture.

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

[0013]

[0014] Where f is the pressure exerted on a single elastic element during isostatic pressing, L is the initial length of the elastic element, N is the number of elastic elements, and I is the shrinkage of the elastic element during isostatic pressing. This design method allows for the calculation of a suitable stiffness for a single elastic element by measuring the pressure f exerted on it during isostatic pressing, the initial length L of the elastic element (the distance between the two clamping plates in the second direction), and the shrinkage of the elastic element during isostatic pressing. This facilitates the selection of fixture stiffness before fixture production, making the fixture more compatible with the isostatic pressing requirements and further improving the reliability of the fixture.

[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 its large surface can maximize the stiffness of a larger area of ​​the battery cell's outer surface, further improving the reliability of the isostatic pressing process.

[0016] In some embodiments, in the second direction, each clamp is configured with a maximum spacing of 2 mm to 5 mm between it and the electrode assembly. This design allows for a suitable spacing between the clamps and the electrode assembly, improving the tensioning effect on the flexible encapsulation film.

[0017] In some embodiments, the dimensions of each clamp in the second direction are 2mm to 5mm. This design allows the clamps to have a suitable width, increasing the friction between the clamps and the flexible encapsulation film, thereby improving the clamping effect on the flexible encapsulation film.

[0018] In some embodiments, the dimensions of each clamping plate in the first direction are 1 mm to 3 mm. This design can improve the rigidity of the clamping plates themselves and enhance their reliability during the isostatic pressing process.

[0019] In some embodiments, the clamp includes two flexible tension membranes, which are respectively connected to a first clamping member and a second clamping member. In the first direction, the projection of the clearance portion falls entirely within the flexible tension membranes. By designing the clamp to include two flexible tension membranes, the first and second clamping members can respectively drive the two flexible tension membranes to clamp the battery cell in the first direction. The flexible tension membranes can further improve the overall stiffness of the outer surface of the battery cell, thus making it more suitable for isostatic pressing processes.

[0020] In some embodiments, the clamp further includes a buffer member disposed on the surface of the first clamping member near the second clamping member, and / or, the buffer member is disposed on the surface of the second clamping member near the first clamping member; and the buffer member is configured such that its projection along a first direction at least partially overlaps with the flexible encapsulation film. By providing a buffer member on the opposing surfaces of the first and second clamping members, a buffering effect can be achieved during the clamping process of the first and second clamping members, reducing the risk of damage to the flexible encapsulation film by the first and second clamping members. At the same time, the buffer member can also increase the friction between the first and second clamping members and the flexible encapsulation film, thereby improving the tensioning effect of the flexible encapsulation film.

[0021] In some embodiments, the clamp further includes a connector connected to both the first clamping member and the second clamping member; the connector is configured to extend and retract along a first direction. The connector is used to improve the structural consistency between the first clamping member and the second clamping member, and can control the distance between the first clamping member and the second clamping member in the first direction, as well as the magnitude of the preload applied to the flexible encapsulation film.

[0022] In some embodiments, the second clamping member and the first clamping member are symmetrically arranged along a plane perpendicular to the first direction. That is, the structure of the second clamping member is consistent with that of the first clamping member. The second clamping member also includes two clamping plates and an elastic member between the two clamping plates. This arrangement, by unifying the structure of the first clamping member and the second clamping member, eliminates the need to design two separate sets of molds, which is beneficial to improving the production efficiency and economy of the fixture.

[0023] This application also provides an isostatic pressing device, which includes a clamp as provided in any of the foregoing embodiments.

[0024] This application also provides a battery production apparatus, which includes an isostatic pressing device as provided in any of the foregoing embodiments.

[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is an exploded view of the battery device provided in some embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0029] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0030] Figure 4 A cross-sectional structural schematic diagram of the fixture provided in some embodiments of this application;

[0031] Figure 5 This is a top view of a fixture provided in some embodiments of this application.

[0032] Explanation of reference numerals in the attached drawings: 1000, battery device;

[0033] 100. Fixture; 10. First clamping component; 11. Clamping plate; 12. Elastic component; 20. Second clamping component; 40. Buffer component; 50. Connecting component;

[0034] 101. Avoidance section; X, first direction; Y, second direction; Z, third direction;

[0035] 200. Battery cell; 201. Electrode assembly; 2011. Main body; 2012. Tab; 202. Flexible encapsulation film;

[0036] 300. Box body; 301. First part; 302. Second part. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, where the term "and / or" appears, "and / or" merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship. Where the terms "first" and "second" appear, these terms are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, 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 possible implementation.

[0043] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0044] Solid-state batteries typically use solid electrolytes composed of various solid particles, and the contact performance between these particles has a significant impact on the battery's performance. For example, weak contact between solid particles can lead to low transport kinetics of charged ions between them, thus affecting the battery's performance.

[0045] In related technologies, isostatic pressing is applied to solid-state batteries to improve their densification performance. Specifically, after fabricating the electrode assembly of the solid-state battery, isostatic pressing is performed on the electrode assembly by placing it in an isostatic pressing environment to apply pressure. Since the length and width of a solid-state battery are usually much greater than its thickness, exhibiting a planar characteristic, this structure can be considered as having infinite in-plane stiffness and extremely low out-of-plane stiffness. During isostatic pressing, it is prone to aging phenomena such as bending and crushing. Therefore, clamps are usually used to clamp the battery during isostatic pressing to improve its out-of-plane stiffness.

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

[0047] Based on the above considerations, in order to improve the structural strength of the battery cell during isostatic pressing and to enhance the uniformity of pressure on the outer surface of the battery cell during isostatic pressing, this application provides a clamp. The clamp includes a first clamping member and a second clamping member disposed opposite to each other along a first direction. Both the first and second clamping members are provided with clearance portions. The first and second clamping members are configured to clamp the flexible encapsulation film at least on one opposite side of the battery cell. The clearance portions are configured to completely cover the electrode assembly along the projection in the first direction. In this way, the clamp can clamp the battery cell by clamping the flexible encapsulation film, indirectly improving the rigidity of the electrode assembly on its outer surface. Simultaneously, since the first and second clamping members 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 can be reduced. This improves both the structural reliability of the battery cell during isostatic pressing and the isostatic pressing effect of the battery cell.

[0048] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0049] Please see Figure 1 , Figure 1 This is an exploded structural diagram of a battery device provided in some embodiments of this 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 provides a accommodating space for the battery cell 200, and the housing 300 can employ various structures. In some embodiments, the housing 300 may include a first portion 301 and a second portion 302, which overlap each other, and together define a accommodating space for housing the battery cell 200.

[0050] In the battery device 1000, there can be multiple battery cells 200, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 200 are connected in both series and parallel connections. Multiple battery cells 200 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 200 is housed within the housing 300. Alternatively, the battery device 1000 can also consist of multiple battery cells 200 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 300. The battery device 1000 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 200.

[0051] A battery cell 200 refers to the smallest unit that makes up a battery. A battery cell 200 includes an end cap, a casing, an electrode assembly 201, and other functional components. The electrode assembly 201 is the component in the battery cell 200 where electrochemical reactions occur. The casing 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 an electrode assembly according to some embodiments of this application. The electrode assembly 201 may include a positive electrode, a negative electrode, and a solid electrolyte. The solid electrolyte is located between the positive and negative electrodes and is used to form an ion channel between them, ensuring the transfer and reaction of positive and negative ions. The material of the solid electrolyte may include oxides, phosphates, silicates, nitrides, or sulfides, etc. The positive electrode, negative electrode, and the solid electrolyte sandwiched between the positive and negative electrodes are wound or stacked to form the electrode assembly 201. Figure 2 The electrode assembly shown is formed by stacking a positive electrode, a negative electrode, and a solid electrolyte. The portions of the positive and negative electrodes containing active material constitute the main body 2011 of the electrode assembly 201, while the portions of the positive and negative electrodes without active material constitute tabs 2012. The tabs 2012 can be located together at one end of the main body or at both ends of the main body 2011. The electrode assembly 201 can be rectangular, cylindrical, or other shapes.

[0053] Figure 3 This is a schematic diagram of the structure of a packaged electrode assembly according to some embodiments of this application. (In conjunction with...) Figure 2 and Figure 3 A flexible encapsulation film 202 is wrapped around the surface of the electrode assembly 201. At this time, the flexible encapsulation film 202 can be regarded as the aforementioned outer shell (end cap, housing) structure of the battery cell. That is, the flexible encapsulation film 202 encapsulates the electrode assembly 201 and together forms the battery cell 200.

[0054] For example, in these embodiments of this application, the flexible encapsulation film 202 may be one of aluminum-plastic film, polyethylene film, and polypropylene film. The thickness of the flexible encapsulation 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 encapsulation film 202 is 300 μm.

[0055] Please refer to the following: Figures 1 to 5 This application provides a clamp 100 for clamping a battery cell 200. The battery cell 200 includes an electrode assembly 201 and a flexible encapsulation film 202 for encapsulating the electrode assembly 201. The clamp 100 includes a first clamping member 10 and a second clamping member 20 disposed opposite to each other along a first direction X. Both the first clamping member 10 and the second clamping member 20 are provided with a clearance portion 101. The clearance portion 101 passes through 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 encapsulation film 202 at least at both ends of the battery cell 200 along the second direction Y. The clearance portion 101 is configured to completely cover the electrode assembly 201 with its projection along the first direction X. The second direction Y intersects the first direction X.

[0056] The clamp 100 is designed to increase 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 isostatic pressing 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 can be cold isostatic pressing, warm isostatic pressing, or hot isostatic pressing.

[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. The first clamping member 10 and the second clamping member 20 are specific components of 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 opposite each other along the first direction X. This means that the first direction X is the orientation of the first clamping member 10 and the second clamping member 20. Simultaneously, the first direction X can 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 between them.

[0060] Both the first clamping member 10 and the second clamping member 20 are provided with hollowed-out clearance portions 101. In a possible implementation, the clearance portion 101 can be a through-slot structure or a through-hole structure that penetrates both the first clamping member 10 and the second clamping member 20 along the first direction X. In these embodiments of this application, the clearance portion 101 structure on the first clamping member 10 and the second clamping member 20 can be directly formed by stamping, injection molding, or other methods. Alternatively, after forming the overall structure of the first clamping member 10 or the second clamping member 20, the aforementioned hollowed-out clearance portion 101 structure can be formed by cutting and grinding on the first clamping member 10 and the second clamping member 20, respectively.

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

[0062] By clamping the flexible encapsulation film 202 at least at both ends of the battery cell 200 along the second direction Y with the first clamping member 10 and the second clamping member 20, the flexible encapsulation film 202 is stretched along the aforementioned direction of the opposite sides using the clamping action of the first clamping member 10 and the second clamping member 20. This allows the flexible encapsulation film 202 to be stretched and adhered to the outer surface of the electrode assembly 201, thereby increasing the outer surface stiffness of the electrode assembly 201 using the tension of the flexible encapsulation film 202. In the subsequent isostatic pressing process, the battery cell 200 with 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 isostatic pressing.

[0063] The clearance portion 101 is configured to completely cover the electrode assembly 201 along its projection in the first direction X. This means that the clearance portion 101 is used to avoid the electrode assembly 201 within the battery cell 200 when the first clamping member 10 and the second clamping member 20 clamp the battery cell 200. Specifically, the first clamping member 10 and the second clamping member 20 clamp the battery cell 200 only by clamping the flexible encapsulation 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 isostatic pressing, ensuring uniform pressure on all locations on the outer surface of the battery cell 200 during the isostatic pressing process. This further reduces the impact of the clamp 100 on the isostatic pressing process and improves the reliability of the isostatic pressing treatment of the battery cell 200.

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

[0065] Meanwhile, since the clearance 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 clearance portion 101 on the first clamping member 10 and the second clamping member 20. In the subsequent isostatic pressing process, the isostatic medium can contact the outer surface of the electrode assembly 201 uniformly through the clearance portion 101, thereby achieving the effect of uniformly applying pressure to the outer surface of the electrode assembly 201.

[0066] In these embodiments of this application, the clearance portion 101 penetrates the first clamping member 10 and the second clamping member 20 along the first direction X. A possible implementation is that both the first clamping member 10 and the second clamping member 20 are plate-like structures, and the clearance portion 101 is a through groove or through hole structure provided on the first clamping member 10 and the second clamping member 20. Alternatively, in some embodiments, the first clamping member 10 or the second clamping member 20 may be a split structure. Taking the first clamping member 10 as an example, the first clamping member 10 may be composed of multiple components, which are spaced apart on a plane perpendicular to the first direction X, and the clearance portion 101 is formed between these components. That is, the first clamping member 10 or the second clamping member 20 may each be an integral structure or a split structure composed of multiple components.

[0067] In the technical solution of this application embodiment, by designing that both the first clamping member 10 and the second clamping member 20 are provided with hollowed-out avoidance portions 101, the first clamping member 10 and the second clamping member 20 jointly clamp the flexible encapsulation 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 encapsulation film 202 increases the tension force of the flexible encapsulation film 202 on the electrode assembly 201, which can improve the overall rigidity of the outer surface of the electrode assembly 201, thereby improving the reliability of the battery cell 200 in 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 encapsulation film 202, which can reduce the influence of the clamp 100 on the isostatic pressing, improve the uniformity of pressure at various positions on the outer surface of the electrode assembly 201 in the isostatic pressing process, and help improve the effect of isostatic pressing.

[0068] In some embodiments, the first clamping member 10 includes two clamping plates 11 disposed 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 on the same plane, and the second direction Y intersects 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 encapsulation film 202.

[0069] The clamping plate 11 is the component in the first clamping member 10 that actually contacts the battery cell 200, and is the component in the first clamping member 10 that actually cooperates with the second clamping member 20 to clamp the battery cell 200. The surfaces of the two clamping plates 11 approaching the second clamping member 20 along the first direction X are on the same plane to improve the parallelism of the clamping surfaces of the two clamping plates 11, 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 each other along the second direction Y. In a possible implementation, the two clamping plates 11 adopt a split structure and are formed separately. During the assembly process of the fixture 100, the two clamping plates 11 are driven by different driving mechanisms to move the clamping plates 11 in a direction close to or away from the second clamping member 20, thereby clamping or releasing the battery cell 200. In some embodiments, the two clamping plates 11 can also be formed separately, and during the assembly process of the fixture 100, the two clamping plates 11 can be connected into a whole by an external connecting member, and then the two clamping plates 11 formed into a whole can be driven by a driving mechanism. In some embodiments, the two clamping plates 11 and the connecting member between them can also be integrally formed to improve the structural consistency between the two clamping plates 11.

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

[0072] Understandably, to enhance the overall stiffness improvement of the outer surface of the electrode assembly 201 after tensioning, 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 mutually perpendicular. In this way, the two clamping plates 11 can cover the entire flexible encapsulation film 202 along the third direction Z on both sides of the battery cell 200 along the second direction Y, comprehensively clamping the flexible encapsulation film 202. This allows the stretched and tensioned portion of the flexible encapsulation film 202 and the electrode assembly 201 to cover the entire surface of the electrode assembly 201 along the first direction X, thereby uniformly improving the surface stiffness of the electrode assembly 201 at both ends along the first direction X, adapting to subsequent isostatic pressing treatment.

[0073] Meanwhile, 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 miniaturization design of the clamp 100 itself, and thus adapts to more sizes of isostatic pressing devices.

[0074] In some embodiments, at least one of the two clamps 11 may be 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 change of the battery cell 200 during the isostatic pressing process, reduce the risk of further tearing of the flexible encapsulation film 202 due to the clamping of the clamp 100 when the size of the battery cell 200 changes, and reduce the risk of the flexible encapsulation film 202 being torn and causing the isostatic medium to come into contact with the electrode assembly 201.

[0076] At least one of the two clamping plates 11 can move along the second direction Y. In a possible implementation, the position of one of the two clamping plates 11 in the second direction Y is fixed. For example, the clamping plate 11 can be connected to a guide rod extending along the first direction X so that the clamping plate 11 can reciprocate along the first direction X but cannot change its position in the second direction Y. In some embodiments, both clamping plates 11 can also be configured to move along the second direction Y to further increase the sensitivity of adjusting the distance between the two clamping plates 11 in 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 being disposed between the two clamping plates 11 and connected to the two clamping plates 11 respectively.

[0078] The elastic element 12 is disposed between the two clamping plates 11 and is connected to the two clamping plates 11 respectively. In a possible implementation, the two ends of the elastic element 12 are directly connected to the two clamping plates 11 respectively. Alternatively, in some embodiments, the clamping plates 11 may be provided with an extension structure in the first direction X, and the elastic element 12 may be connected between the extension structures of the two clamping plates 11 in the first direction X.

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

[0080] Meanwhile, after the clamp 100 holds the battery cell 200 and places them together into the isostatic pressing device, the elastic element can adapt to the pressure applied to the clamping plates 11, so that the distance between the two clamping plates 11 can decrease as the size of the battery cell 200 is compressed. This can mitigate the risk of the electrode assembly 201 and the clamp 100 tearing the flexible encapsulation film 202 due to the compression of the electrode assembly 201 after the clamp 100 clamps the flexible encapsulation film 202. This can improve the structural integrity of the flexible encapsulation film 202 during the isostatic pressing process and reduce the risk of the isostatic pressing medium coming into contact with the electrode assembly 201 due to damage to the flexible encapsulation film 202. Furthermore, as the external pressure gradually disappears, the two clamping plates can automatically return to their original position under the action of the elastic element, further improving the reliability of the clamp.

[0081] In some embodiments, the number of elastic elements 12 is multiple, and each elastic element 12 is configured to be misaligned with the electrode assembly 201 along the first direction X.

[0082] By setting the number of elastic elements 12 to multiple, the stiffness requirement for each individual elastic element 12 can be reduced, providing more possibilities for the material selection of the elastic elements 12. Exemplarily, in these embodiments of this application, the elastic elements 12 can be, but are not limited to, springs made of materials with high stiffness such as alloy steel or ceramics.

[0083] Each elastic element 12 is configured to be offset from the electrode assembly 201 along the first direction X, that is, the elastic elements 12 are concentrated at both ends of the clamping plate 11, forming a rectangular structure with the two clamping plates 11. In this way, by setting each elastic element 12 to be offset from the electrode assembly 201 in the first direction X, when the first clamping member 10 and the second clamping member 20 clamp the battery cell 200, each elastic element 12 will not come into contact with the electrode assembly 201, reducing the risk of mutual interference between the elastic elements 12 and the electrode assembly 201, thereby further improving the reliability of the clamp 100.

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

[0085]

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

[0087] When there is only one elastic element 12, the stiffness of the elastic element 12 can be calculated by the ratio of the resultant force of 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. Then, when the number of elastic elements 12 is set to multiple, the formula for calculating the stiffness K of a single elastic element 12 is fL / NI.

[0088] The pressure f experienced by a single elastic element 12 during isostatic pressing can be calculated using the number of elastic elements 12, the pressure of the isostatic pressing device, and the area of ​​the clamping plate 11 in the second direction Y. The initial length L of the elastic element 12 can be calculated by measurement. The amount of contraction of the elastic element 12 during isostatic pressing can be regarded as the amount of contraction of the electrode assembly 201 in the second direction Y during isostatic pressing.

[0089] In this way, by measuring the pressure f experienced by a single elastic element 12 during isostatic pressing, the initial length L of the elastic element 12 (the distance between the two clamping plates in the second direction), and the amount of shrinkage of the elastic element 12 during isostatic pressing, the appropriate stiffness of a single elastic element 12 can be calculated. This facilitates the selection of the stiffness of the fixture 100 before its production, making the fixture 100 more compatible with the isostatic pressing requirements and further improving the reliability of the fixture 100.

[0090] In some embodiments, the first direction X is configured to be perpendicular to the 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 usually a thin flat plate structure with a length and width 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 set up the clamp 100 and to utilize the flexible encapsulation 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 clamp 11 is configured to have a maximum spacing of 2 mm to 5 mm between it and the electrode assembly 201.

[0093] The distance between the clamping plate 11 and the electrode assembly 201 in the second direction Y is the distance between the clamping plate 11 and the electrode assembly 201 after the clamping fixture 100 clamps the battery cell 200. When the distance between the clamping plate 11 and the electrode assembly 201 is too small, the clamping plate 11 can cooperate with the electrode assembly 201 to form a large shear force during the clamping process of the clamping fixture 100, which can easily cause the flexible encapsulation film 202 to break. When the distance between the clamping plate 11 and the electrode assembly 201 is too large, it may be difficult for the clamping fixture 100 to tighten the flexible encapsulation film 202 after clamping, resulting in limited improvement in the stiffness of the outer surface of the battery cell 200.

[0094] Exemplary examples, in these embodiments of the present application, each clamp 11 may be configured to have a maximum distance of 3 mm or 4 mm from the electrode assembly 201 in the second direction Y, in order to accommodate battery cells 200 of different sizes.

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

[0096] In some embodiments, the dimensions of each clamp 11 in the second direction Y are 2 mm to 5 mm.

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

[0098] For example, the dimensions of each clamp 11 in the second direction Y can be, but are not limited to, 3 mm or 4 mm.

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

[0100] For example, in these embodiments of the present application, the size of the clamp 11 in the first direction X may be 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 falls entirely within the flexible tension membrane.

[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 at their respective ends in the first direction X clamp the battery cell 200 together.

[0103] In these embodiments of the present application, the material of the flexible tensioning membrane can be one of aluminum-plastic film, polyethylene film, or polypropylene film.

[0104] Two flexible tension membranes are respectively connected to the first clamping member 10 and the second clamping member 20. In the first direction X, the projection of the avoidance portion 101 falls completely within the flexible tension membrane. In a possible implementation, the two flexible tension membranes can be connected to the surfaces of the first clamping member 10 and the second clamping member 20 near 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 tension membrane can clamp the surfaces of the electrode assembly 201 at both ends in the first direction X as 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 of the first clamping member 10 and the second clamping member 20 that are opposite each other, 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 in the first direction X, the surfaces of the electrode assembly 201 at both ends in the first direction X can be clamped.

[0106] In these embodiments of this application, the battery cell 200 is clamped along the first direction X by the first clamping member 10 and the second clamping member 20 respectively driving two flexible tension films. This reduces the dimensional accuracy requirements of the first clamping member 10 and the second clamping member 20. 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 encapsulation film 202 of the battery cell 200, and without worrying about whether the flexible encapsulation film 202 will slide relative to the first clamping member 10 or the second clamping member 20 due to pressure. This is beneficial to improving the production efficiency and working efficiency of the fixture.

[0107] In some embodiments, the clamp 100 further includes a buffer 40 disposed on the surface of the first clamp 10 near the second clamp 20, and / or the second clamp 20 near the surface of the first clamp 10; and the buffer 40 is configured such that its projection along the first direction X at least partially overlaps with the flexible encapsulation film 202.

[0108] By providing a buffer 40 on the surfaces of the first clamping member 10 and the second clamping member 20 opposite to each other, a buffering effect can be achieved during the clamping process of the first clamping member 10 and the second clamping member 20, reducing the risk of the first clamping member 10 and the second clamping member 20 damaging the flexible encapsulation film 202. At the same time, the buffer 40 can also increase the friction between the first clamping member 10 and the second clamping member 20 and the flexible encapsulation film 202, thereby improving the tensioning effect of the flexible encapsulation film 202.

[0109] The material of the buffer 40 may be, but is not limited to, rubber or silicone. The shape of the buffer 40 may 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 may 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 may be a matching arc shape.

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

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

[0112] One possible implementation is that the connector 50 is disposed between the first clamping member 10 and the second clamping member 20 along the first direction X. This means that the connector 50 is used to connect the first clamping member 10 and the second clamping member 20 to improve the structural consistency of the fixture 100.

[0113] In some embodiments, the two ends of the connector 50 along the first direction X may be connected to the surfaces of the opposing clearance portions 101 of the first clamping member 10 and the second clamping member 20, respectively.

[0114] The connector 50 is configured to extend and retract along the first direction X. By extending and retracting the connector 50 along the first direction X, the distance between the first clamping member 10 and the second clamping member 20 in the first direction X can be changed, thereby achieving the clamping and releasing of the battery cell 200.

[0115] In these embodiments of this application, the connector 50 can be configured as a telescopic rod structure with a drive mechanism. The drive mechanism can drive the telescopic rod to extend or retract in the first direction X, thereby causing 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 connector 50 improves the structural consistency between the first clamping member 10 and the second clamping member 20, and can control the distance between the first clamping member 10 and the second clamping member 20 in the first direction X, as well as the magnitude of the preload applied to the flexible encapsulation film 202.

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

[0118] Multiple connectors 50 are evenly distributed along the periphery of the first clamping member 10 or the second clamping member 20 to form uniform support 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 retraction of multiple connectors 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 connectors 50 can be four, wherein two connectors 50 are disposed between the two ends of a clamping plate 11 along the third direction Z and the second clamping member 20, and the other two connectors 50 are disposed between the two ends of another clamping plate 11 along the third direction Z and the second clamping member 20.

[0120] According to the embodiment of this application, the clamp 100 can improve the balance of the first clamping member 10 or the second clamping member 20 when moving along the first direction X, which is beneficial to improving the parallelism between the first clamping member 10 or the second clamping member 20 and the other when moving, thereby 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. The second clamping member 20 also includes two clamping plates and an elastic member between the two clamping plates. This arrangement, by unifying the structure of the first clamping member 10 and the second clamping member 20, eliminates the need to design two additional sets of molds, which is beneficial to improving the production efficiency and economy of the fixture 100.

[0123] This application also provides an isostatic pressing device, which includes a clamp 100 as provided in any of the foregoing embodiments.

[0124] It should be noted that the isostatic pressing device usually also includes a pressure vessel, a pressurization system, and a temperature control system. When performing isostatic pressing on the battery cell 200, the battery cell 200 is usually clamped by the clamp 100 to increase the outer surface rigidity of the battery cell 200. Then, the battery cell 200 together with the clamp 100 is placed into the pressure vessel filled with isostatic medium. After the pressure vessel is sealed and tightened, the pressure and temperature of the isostatic medium are adjusted by the pressurization 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 (the space corresponding to the avoidance part 101) in the clamp 100. Since the isostatic 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 this application, since the clamp 100 does not directly act on the electrode assembly 201 when clamping the battery cell 200, but instead clamps the flexible encapsulation film 202 of the battery cell 200, the electrode assembly 201 is tightened by the flexible encapsulation film 202. While improving the rigidity of the outer surface of the electrode assembly 201, it can also improve the uniformity of pressure on various parts of the outer surface of the battery cell 200 during isostatic pressing, further improving the isostatic pressing effect of the battery cell 200.

[0126] This application also provides a battery production apparatus, which includes an isostatic pressing device as provided in any of the foregoing embodiments.

[0127] Based on some embodiments of this application, please refer to the following: Figures 1 to 5 This application provides a clamp 100 for clamping a battery cell 200. The battery cell 200 includes an electrode assembly 201 and a flexible encapsulation film 202 for encapsulating the electrode assembly 201. 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, a flexible tensioning film, a buffer member 40, and a connecting member 50. Both the first clamping member 10 and the second clamping member 20 are provided with a clearance portion 101. The first clamping member 10 and the second clamping member 20 are configured to clamp the flexible encapsulation film 202 at least at both ends of the battery cell 200 along the second direction Y. The clearance portion 101 is configured to completely cover the electrode assembly 201 when projected along the first direction X.

[0128] The clamp 100 is designed to increase 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 isostatic pressing 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 perforated clearance portions 101. The first clamping member 10 and the second clamping member 20 are configured to clamp the flexible encapsulation film 202 at least at both ends of the battery cell 200 along the second direction Y. This clamping action stretches the flexible encapsulation film 202 along the aforementioned opposite side orientation, allowing it to be stretched and adhered tightly to the outer surface of the electrode assembly 201. This tension of the flexible encapsulation film 202 increases the outer surface stiffness of the electrode assembly 201. During subsequent isostatic pressing, the battery cell 200, with its increased 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 variations during isostatic pressing.

[0130] The avoidance part 101 is designed to avoid the electrode assembly 201 in the battery cell 200 when the first clamping member 10 and the second clamping member 20 clamp the battery cell 200. That is, the first clamping member 10 and the second clamping member 20 clamp the battery cell 200 only by clamping the flexible encapsulation film 202, without contacting the electrode assembly 201. In this way, the influence of the clamp 100 on the outer surface of the battery cell 200 during the isostatic pressing process can be reduced, so that the pressure on all parts of the outer surface of the battery cell 200 remains uniform during the isostatic pressing process. This reduces the influence of the clamp 100 on the isostatic pressing process and improves the reliability of the isostatic pressing process of the battery cell 200.

[0131] In these embodiments of this application, there are two flexible tension films. The two flexible tension films are respectively connected to the first clamping member 10 and the second clamping member 20. In the first direction X, the flexible tension film overlaps with the avoidance part 101. At this time, it is only necessary to configure the avoidance part 101 on the first clamping member 10 and the second clamping member 20 to cover the electrode assembly 201 in the first direction X. There is no need to worry about whether the first clamping member 10 and the second clamping member 20 clamp the flexible encapsulation film 202 of the battery cell 200, and there is no need to worry about whether the flexible encapsulation film 202 will slide relative to the first clamping member 10 or the second clamping member 20 due to pressure. This is beneficial to improving the production efficiency and working efficiency of the fixture.

[0132] The buffer 40 is disposed on the surface of the first clamp 10 near the second clamp 20, and / or the buffer 40 is disposed on the surface of the second clamp 20 near the first clamp 10; and the buffer 40 is configured such that its projection along the first direction X at least partially overlaps with the flexible encapsulation film 202.

[0133] By providing a buffer 40 on the surfaces of the first clamping member 10 and the second clamping member 20 opposite to each other, a buffering effect can be achieved during the clamping process of the first clamping member 10 and the second clamping member 20, reducing the risk of the first clamping member 10 and the second clamping member 20 damaging the flexible encapsulation film 202. At the same time, the buffer 40 can also increase the friction between the first clamping member 10 and the second clamping member 20 and the flexible encapsulation film 202, thereby improving the tensioning effect of the flexible encapsulation film 202.

[0134] A connector 50 is disposed between the first clamping member 10 and the second clamping member 20 along the first direction X; the connector 50 is configured to be telescopic along the first direction X. In these embodiments of the present application, the connector 50 can be configured as a telescopic rod structure with a drive mechanism, which can drive the telescopic rod to extend and retract in the first direction X, thereby changing the distance between the first clamping member 10 and the second clamping member 20 in the first direction X.

[0135] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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 embodiments described above are merely illustrative of several implementation methods of this application, and 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 those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A jig for clamping a battery cell including an electrode assembly and a flexible packaging film that packages the electrode assembly, characterized by, The clamp comprises: a first clamping member and a second clamping member oppositely arranged along a first direction, the first clamping member and the second clamping member are both provided with a relief portion penetrating 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 encapsulation film at least at two ends of the battery monomer along a second direction, the relief portion is configured to completely cover the electrode assembly in projection along the first direction, and the second direction intersects the first direction; the first clamping member comprises two clamping plates oppositely arranged 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 monomer respectively to clamp the flexible encapsulation film; at least one of the two clamping plates is movable along the second direction; the clamp comprises two flexible tensioning films, the two flexible tensioning films are connected to the first clamping member and the second clamping member respectively, and the projection of the relief portion completely falls within the flexible tensioning films in the first direction.

2. The clamp of claim 1, wherein the first clamping member further comprises elastic members arranged along the second direction, the elastic members are arranged between the two clamping plates and connected to the two clamping plates respectively.

3. The clamp of claim 2, wherein The number of the elastic members is plural, and each elastic member is configured to be misaligned with the electrode assembly in projection along the first direction.

4. The clamp of claim 1, wherein The first direction is configured to be perpendicular to a large surface of the battery monomer.

5. The clamp of claim 4, wherein In the second direction, each clamping plate is configured to have a maximum spacing of 2mm to 5mm with the electrode assembly.

6. The clamp of claim 4, wherein Each clamping plate has a size of 2mm to 5mm in the second direction; and / or, each clamping plate has a size of 1mm to 3mm in the first direction.

7. The clamp of claim 1, wherein The clamp further comprises a buffer member arranged on a surface of the first clamping member close to the second clamping member, and / or a buffer member arranged on a surface of the second clamping member close to the first clamping member; and the buffer member is configured to at least partially overlap the flexible encapsulation film in projection along the first direction.

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

9. The clamp of any one of claims 1 to 8, wherein, The second clamping member and the first clamping member are symmetrically arranged along a plane perpendicular to the first direction.

10. An isostatic pressing apparatus characterized by comprising: The clamp comprises any one of claims 1 to 9.

11. A battery production apparatus characterized by comprising: The isostatic pressing device comprises claim 10.

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