Isostatic pressing device and isostatic pressing equipment

Abstract

The utility model provides an isostatic pressing device and isostatic pressing equipment, and belongs to the technical field of batteries. The isostatic pressing device comprises an isostatic pressing film, a supporting frame and a clamping assembly. The isostatic pressing film comprises a first isostatic pressing film and a second isostatic pressing film which are oppositely arranged; the supporting frame is provided with a central through hole, the supporting frame is located between the first isostatic pressing film and the second isostatic pressing film, and the first isostatic pressing film, the second isostatic pressing film and the supporting frame form a containing space used for containing the electrode assembly; the clamping assembly comprises a first pressing frame and a second pressing frame, and the first pressing frame and the second pressing frame are each of a hollow structure so as to allow an isostatic pressing medium to make contact with the isostatic pressing film. Wherein the first isostatic pressing film is detachably clamped between the first pressing frame and the supporting frame, and the second isostatic pressing film is detachably clamped between the second pressing frame and the supporting frame. Therefore, the structural integrity of the isostatic pressing film can be maintained, and the isostatic pressing film can be reused conveniently through detachable connection, so that the isostatic pressing treatment cost is reduced.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and in particular to an isostatic pressing device and an isostatic pressing equipment. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of society. Rechargeable batteries have the characteristics of storing or releasing energy as needed, and thus are widely used in various electrical devices or energy storage systems. They are an important part of promoting energy transformation and sustainable development. For the new energy industry, battery technology is also an important factor related to its development.

[0003] The electrode assembly is the core component of the battery. By performing isostatic pressing on the electrode assembly, the density and structural stability of the electrode assembly can be improved, thereby enhancing the charge and discharge efficiency, energy density, and cycle life of the battery. In some cases, the cost of isostatic pressing of the electrode assembly is relatively high, and there is an urgent need for improvement. Summary of the Utility Model

[0004] This application aims to solve at least one of the technical problems existing in the background art. For this reason, an object of this application is to provide an isostatic pressing device and an isostatic pressing equipment to reduce the cost of isostatic pressing of the electrode assembly.

[0005] An embodiment of the first aspect of this application provides an isostatic pressing device. The isostatic pressing device is used for performing isostatic pressing on the electrode assembly. The isostatic pressing device includes an isostatic pressing film, a support frame, and a clamping assembly; the isostatic pressing film includes a first isostatic pressing film and a second isostatic pressing film arranged oppositely; the support frame has a central through hole, the support frame is located between the first isostatic pressing film and the second isostatic pressing film, and the first isostatic pressing film, the second isostatic pressing film, and the support frame form an accommodation space for accommodating the electrode assembly; the clamping assembly includes a first pressing frame located on the side of the first isostatic pressing film away from the support frame, and a second pressing frame located on the side of the second isostatic pressing film away from the support frame. Both the first pressing frame and the second pressing frame are hollow structures to allow the isostatic pressing medium to contact the isostatic pressing film; wherein, the first isostatic pressing film is detachably clamped between the first pressing frame and the support frame, and the second isostatic pressing film is detachably clamped between the second pressing frame and the support frame.

[0006] In the technical solution of the embodiment of this application, by detachably clamping the first isostatic pressing film between the first pressing frame and the support frame, and detachably clamping the second isostatic pressing film between the second pressing frame and the support frame, it is beneficial to separate the relatively fixed structures from each other, and it will not cause irreparable damage to the isostatic pressing film, maintaining the structural integrity of the isostatic pressing film, facilitating the reuse of the isostatic pressing film, thereby reducing the cost of isostatic pressing; in addition, the detachable design can make the isostatic pressing film easier to separate and recycle, thereby improving the resource utilization rate and reducing resource consumption.

[0007] In some embodiments, a seal is provided between at least one of the first isostatic pressing film and the support frame, the first isostatic pressing film and the first pressing frame, the second isostatic pressing film and the support frame, and the second isostatic pressing film and the second pressing frame. During isostatic pressing treatment, by providing the seal, the sealing effect can be improved and impurities can be prevented from invading the accommodation space containing the electrode assembly, thereby reducing the risk of direct contact between the isostatic pressing medium or impurities and the electrode assembly, which is beneficial to improving the isostatic pressing treatment effect of the electrode assembly.

[0008] In some embodiments, the seal protrudes from the surface of the first pressing frame facing the first isostatic pressing film side, and / or the seal protrudes from the surface of the second pressing frame facing the second isostatic pressing film side. Thereby, the sealing effect between the isostatic pressing film and the clamping assembly can be improved, the possibility of direct contact between the isostatic pressing medium or impurities and the electrode assembly can be reduced, which is beneficial to the densification treatment of the electrode assembly.

[0009] In some embodiments, the seal protrudes from the surface of the support frame facing the first isostatic pressing film side, and / or the seal protrudes from the surface of the support frame facing the second isostatic pressing film side. Thereby, the sealing effect between the isostatic pressing film and the support frame can be improved, the possibility of direct contact between the isostatic pressing medium or impurities and the electrode assembly can be reduced, which is beneficial to the isostatic pressing treatment of the electrode assembly, thereby improving the energy density and structural stability of the electrode assembly.

[0010] In some embodiments, the seal protrudes from the surface of at least one of the first isostatic pressing film and the second isostatic pressing film facing the support frame side and / or the surface facing away from the support frame side. Thereby, the sealing performance of the isostatic pressing device during isostatic pressing treatment can be improved, the possibility of direct contact between the isostatic pressing medium or impurities and the electrode assembly can be reduced, which is beneficial to the isostatic pressing treatment of the electrode assembly, thereby improving the energy density and structural stability of the electrode assembly.

[0011] In some embodiments, the seal is integrally formed with the first isostatic pressing film or the second isostatic pressing film. Integral formation is beneficial to reducing the connection links between the seal and the first isostatic pressing film or the second isostatic pressing film, beneficial to improving the strength and durability of the seal, thereby improving the sealing performance of the isostatic pressing device during isostatic pressing treatment, and further improving the isostatic pressing treatment effect of the electrode assembly.

[0012] In some embodiments, the seal protrudes from one of the clamping assembly and the support frame, and the other of the clamping assembly and the support frame where the seal is not provided is provided with a groove that cooperates with the seal. By providing the groove that cooperates with the seal, it is beneficial to the precise positioning and tight fitting between the clamping assembly and the support frame, thereby improving the reliability of the seal and further improving the isostatic pressing treatment effect of the electrode assembly.

[0013] In some embodiments, the seal is configured to extend continuously circumferentially around the central through-hole and is arranged end to end. Thereby, it is beneficial to achieve an all-round sealing effect on the isostatic pressing device, effectively reducing the risk of isostatic pressing medium or external contaminants leaking into the electrode assembly, and thus improving the isostatic pressing treatment effect of the electrode assembly.

[0014] In some embodiments, the material of the isostatic pressing film is an elastic material. Setting the material of the isostatic pressing film as an elastic material is beneficial for uniformly transmitting pressure and can buffer and protect the electrode assembly, and can adapt to the shape of the electrode assembly, thereby improving the effectiveness and uniformity of pressure transmission during the isostatic pressing process.

[0015] In some embodiments, the isostatic pressing device further includes: a plurality of mounting holes arranged at intervals circumferentially around the central through-hole, and fasteners disposed in the mounting holes; the fasteners are used to clamp the first isostatic pressing film between the first pressing frame and the support frame, and / or, clamp the second isostatic pressing film between the second pressing frame and the support frame. Realizing the clamping and fixing of the isostatic pressing film by setting the fasteners is beneficial for improving the connection strength and maintaining the structural integrity of the isostatic pressing film, facilitating the reuse of the isostatic pressing film, and thus reducing the cost of isostatic pressing treatment.

[0016] In some embodiments, a seal is provided between at least one of the first isostatic pressing film and the support frame, the first isostatic pressing film and the first pressing frame, the second isostatic pressing film and the support frame, and the second isostatic pressing film and the second pressing frame, and the mounting hole is located on the side of the seal away from the central through-hole. The mounting hole being located on the side of the seal away from the central through-hole is beneficial for balancing the pressure of the seal and assisting in the precise positioning and tight fitting between the various components of the isostatic pressing device, thereby improving the reliability of the seal and further improving the isostatic pressing treatment effect of the electrode assembly.

[0017] In some embodiments, a first hole is provided in the central region of the first pressing frame, and a second hole is provided in the central region of the second pressing frame; wherein, the orthographic projection of the central through-hole along the first direction completely falls within the orthographic projection range of the first hole along the first direction, and / or the orthographic projection of the central through-hole along the first direction completely falls within the orthographic projection range of the second hole along the first direction; the first direction is the stacking direction of the first pressing frame, the support frame, and the second pressing frame. Thereby, it is beneficial for the isostatic pressing medium to directly contact the isostatic pressing film through the first hole and the second hole, and then uniformly press the electrode assembly to complete the isostatic pressing treatment, thereby improving the isostatic pressing treatment effect of the electrode assembly.

[0018] In some embodiments, the orthographic projections of the first hole and the second hole completely coincide. It is beneficial for improving the assembly accuracy of the first pressing frame and the second pressing frame, and is beneficial for the isostatic pressing medium to directly contact the isostatic pressing film through the first hole and the second hole to achieve uniform stress on the electrode assembly, thereby improving the isostatic pressing treatment effect of the electrode assembly.

[0019] In some embodiments, along the first direction, the ratio of the orthographic projection area of the first hole to the orthographic projection area of the first pressing frame is greater than or equal to 40% and less than or equal to 90%; and / or along the first direction, the ratio of the orthographic projection area of the second hole to the orthographic projection area of the second pressing frame is greater than or equal to 40% and less than or equal to 90%. By reasonably setting the first hole and the second hole, it is beneficial to improve the connection strength of each component of the isostatic pressing device, and at the same time, take into account that the isostatic pressing medium directly contacts the isostatic pressing film through the first hole and the second hole to achieve uniform stress on the electrode assembly, thereby improving the isostatic pressing treatment effect of the electrode assembly.

[0020] In some embodiments, the support frame further includes a ventilation hole, and the ventilation hole communicates the accommodation space with the external gas. By providing the ventilation hole, it is beneficial to discharge the excess gas in the accommodation space, thereby achieving uniform pressure transmission and reducing the influence of oxygen or other gases on the electrode assembly, thereby improving the isostatic pressing treatment effect of the electrode assembly.

[0021] In some embodiments, the isostatic pressing device further includes a negative pressure generating component, and the negative pressure generating component is connected to the ventilation hole for sucking the gas in the accommodation space. By providing the negative pressure generating component for sucking the gas in the accommodation space, it is beneficial to achieve the uniformity of the pressure received by the electrode assembly during the isostatic pressing process and reduce the risk of oxidation of the electrode assembly, thereby improving the densification effect of the electrode assembly.

[0022] In some embodiments, a one-way valve is provided in the ventilation hole, and the one-way valve is configured to only allow the gas in the accommodation space to flow out unidirectionally. The provision of the one-way valve in the ventilation hole is beneficial to reducing the risk of gas backflow and maintaining the air pressure environment in the accommodation space, thereby achieving the uniformity of the pressure received by the electrode assembly during the isostatic pressing process and further improving the isostatic pressing treatment effect of the electrode assembly.

[0023] In some embodiments, a first coating is provided on the surface of the isostatic pressing film on the side away from the support frame, and the first coating is used to reduce the adhesion between the isostatic pressing film and the isostatic pressing medium. By coating the first coating, the adhesion between the isostatic pressing film and the isostatic pressing medium can be reduced, which helps to clean and reuse the isostatic pressing film and is beneficial to reducing the isostatic pressing treatment cost of the electrode assembly.

[0024] In some embodiments, a second coating is provided on the surface of the isostatic pressing film on the side close to the support frame, and the second coating is used to reduce the adhesion between the isostatic pressing film and the electrode assembly. By providing the second coating on the surface of the isostatic pressing film on the side close to the support frame, the adhesion between the isostatic pressing film and the electrode assembly can be reduced, which helps the self-cleaning of the electrode assembly, thereby reducing the risk of damage and maintaining the performance of the electrode assembly.

[0025] An embodiment of the second aspect of the present application provides an isostatic pressing device, which includes the isostatic pressing device and the providing device in the above embodiments, and the providing device is used to provide an isostatic pressing medium.

[0026] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific implementation manners of the present application. Description of the Drawings

[0027] In the drawings, unless otherwise specified, the same reference numerals throughout the several drawings denote the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in accordance with the present application and should not be regarded as limiting the scope of the present application.

[0028] Figure 1 Structural schematic diagram of a vehicle according to some embodiments of the present application;

[0029] Figure 2 Exploded structural schematic diagram of a battery according to some embodiments of the present application;

[0030] Figure 3 Exploded structural schematic diagram of an isostatic pressing device according to some embodiments of the present application;

[0031] Figure 4 Structural schematic diagram of an isostatic pressing device according to some embodiments of the present application;

[0032] Figure 5 One of the simplified schematic diagrams of an isostatic pressing device according to some embodiments of the present application;

[0033] Figure 6 Another simplified schematic diagram of an isostatic pressing device according to some embodiments of the present application;

[0034] Figure 7 A third simplified schematic diagram of an isostatic pressing device according to some embodiments of the present application;

[0035] Figure 8 A fourth simplified schematic diagram of an isostatic pressing device according to some embodiments of the present application;

[0036] Figure 9 A fifth simplified schematic diagram of an isostatic pressing device according to some embodiments of the present application.

[0037] Description of the Reference Numerals:

[0038] Vehicle 1000;

[0039] Battery 100, controller 200, motor 300, isostatic pressing device 400;

[0040] Box body 10, first part 11, second part 12;

[0041] Battery cell 20, isostatic pressing film 30, first isostatic pressing film 31, second isostatic pressing film 32, support frame 40, central through hole 41, ventilation hole 42, clamping assembly 50, first pressing frame 51, second pressing frame 52, seal 60, groove 61, mounting hole 70, fastener 71;

[0042] First direction X. Detailed implementation manners

[0043] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the description of the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two unless otherwise specifically defined.

[0046] Referring to "embodiment" herein means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0048] In the description of the embodiments of the present application, the term "plurality" means two or more (including two). Similarly, "multiple groups" means two or more groups (including two groups), and "multiple sheets" means two or more sheets (including two sheets).

[0049] In the description of the embodiments of the present application, for technical 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", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0051] Currently, from the perspective of the development of the market situation, rechargeable batteries are more and more widely used. Rechargeable batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power stations, but also widely used in various electronic devices, such as electric vehicles, electric motorcycles, electric vehicles and other electric transportation tools, as well as military equipment and aerospace and other fields. With the continuous expansion of the application fields of rechargeable batteries, the market demand is also constantly increasing.

[0052] As the core component of the battery, the performance of the battery depends to a large extent on the performance of the electrode assembly. In some cases, the production of the electrode assembly will successively go through processes such as slurry preparation, coating operation, drying treatment, die-cutting processing, battery core winding or lamination, isostatic pressing treatment, etc. By performing isostatic pressing treatment on the electrode assembly, the pores between the electrode material particles can be reduced, thereby improving the density and compactness of the electrode assembly, which helps to improve the electrical conductivity and ion transport performance of the electrode, and further enhances the charge and discharge efficiency and energy density of the battery. In addition, isostatic pressing treatment also helps to improve the binding tightness of the electrode material particles, thereby enhancing the structural stability of the electrode assembly.

[0053] The isostatic pressing film is a key auxiliary material for isostatic pressing treatment. As a wrapping material, it can wrap the object to be treated, enabling the isostatic pressing medium to act uniformly on the surface of the object to be treated. The isostatic pressing film can also isolate the object to be treated from the isostatic pressing medium, preventing the object to be treated from being eroded, polluted or affected by other adverse effects. In some cases, the isostatic pressing film is a heat-sealable film material to isolate the isostatic pressing medium and the object to be treated. During use, the electrode assembly needs to be sealed in the isostatic pressing film, and after the isostatic pressing treatment is completed, the electrode assembly is taken out by cutting the sealed edge of the isostatic pressing film. The cut isostatic pressing film cannot be reused due to damage, and a new isostatic pressing film needs to be used for the isostatic pressing treatment of the untreated electrode assembly, which greatly increases the isostatic pressing treatment cost of the electrode assembly.

[0054] To solve the above problems, the present application provides an isostatic pressing device and an isostatic pressing equipment. The isostatic pressing device is used for isostatic pressing treatment of an electrode assembly. The isostatic pressing device includes an isostatic pressing film, a support frame and a clamping assembly; the isostatic pressing film includes a first isostatic pressing film and a second isostatic pressing film arranged opposite to each other; the support frame has a central through hole, and the support frame is located between the first isostatic pressing film and the second isostatic pressing film. The first isostatic pressing film, the second isostatic pressing film and the support frame form a receiving space for accommodating the electrode assembly; the clamping assembly includes a first pressing frame located on the side of the first isostatic pressing film away from the support frame, and a second pressing frame located on the side of the second isostatic pressing film away from the support frame. Both the first pressing frame and the second pressing frame are hollow structures to allow the isostatic pressing medium to contact the isostatic pressing film; wherein, the first isostatic pressing film is detachably clamped between the first pressing frame and the support frame, and the second isostatic pressing film is detachably clamped between the second pressing frame and the support frame. Thus, the structural integrity of the isostatic pressing film can be maintained, and the detachable connection facilitates the reuse of the isostatic pressing film, thereby reducing the isostatic pressing treatment cost.

[0055] The isostatic pressing device disclosed in the embodiments of the present application is used for isostatic pressing treatment of an electrode assembly, and a battery cell can be manufactured using the electrode assembly disclosed in the present application. The battery cell disclosed in the embodiments of the present application can be used, but is not limited to, power-consuming devices or energy storage devices such as vehicles, ships or aircraft. A power supply system of the power-consuming device or the energy storage device can be composed of the battery cell, battery, etc. disclosed in the present application.

[0056] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0057] The embodiments of the present application further provide an energy storage device using a battery as a power source. The energy storage device may be, but is not limited to, an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system, etc.

[0058] For the convenience of description in the following embodiments, a power-consuming device in an embodiment of the present application, taking a vehicle 1000 as an example, will be described.

[0059] Please refer to Figure 1 , Figure 1 , which is a schematic structural diagram of a vehicle provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000. For example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0060] In some embodiments of the present application, the battery 100 may not only be used as an operating power source for the vehicle 1000, but also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Please refer to Figure 2 , Figure 2 , which is a schematic exploded view of a battery provided in some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20. The battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 may adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12. The first part 11 and the second part 12 are covered with each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open. The first part 11 may be a plate-like structure. The first part 11 is covered on the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 may also both be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 may be of various shapes, such as a cylinder, a cuboid, etc.

[0062] In the battery 100, there can be multiple battery cells 20. The multiple battery cells 20 can be connected in series, in parallel, or in a combined series-parallel connection. A combined series-parallel connection means that among the multiple battery cells 20, there are both series and parallel connections. The multiple battery cells 20 can be directly connected in series, in parallel, or in a combined series-parallel connection with each other, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 can also be such that multiple battery cells 20 are first connected in series, in parallel, or in a combined series-parallel connection to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a combined series-parallel connection to form a whole and are accommodated in the box 10. The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing the electrical connection between the multiple battery cells 20.

[0063] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, and can also be an aqueous electrolyte or a non-aqueous electrolyte, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0064] Please refer to Figure 3 and Figure 4 , Figure 3 is an exploded structural schematic diagram of an isostatic pressing device according to some embodiments of the present application, Figure 4 is a structural schematic diagram of an isostatic pressing device according to some embodiments of the present application.

[0065] As Figure 3 and Figure 4 , the embodiments of the present application provide an isostatic pressing device 400 and an isostatic pressing equipment. The isostatic pressing device 400 is used for performing isostatic pressing treatment on an electrode assembly. The isostatic pressing device 400 includes an isostatic pressing film 30, a support frame 40, and a clamping assembly 50. The isostatic pressing film 30 includes a first isostatic pressing film 31 and a second isostatic pressing film 32 arranged oppositely. The support frame 40 has a central through hole 41. The support frame 40 is located between the first isostatic pressing film 31 and the second isostatic pressing film 32. The first isostatic pressing film 31, the second isostatic pressing film 32, and the support frame 40 form an accommodation space for accommodating the electrode assembly. The clamping assembly 50 includes a first pressing frame 51 located on one side of the first isostatic pressing film 31 away from the support frame 40, and a second pressing frame 52 located on one side of the second isostatic pressing film 32 away from the support frame 40. Both the first pressing frame 51 and the second pressing frame 52 are hollow structures to allow the isostatic pressing medium to contact the isostatic pressing film. Among them, the first isostatic pressing film 31 is detachably clamped between the first pressing frame 51 and the support frame 40, and the second isostatic pressing film 32 is detachably clamped between the second pressing frame 52 and the support frame 40.

[0066] Isostatic pressing is a process that uses the properties of liquids or gases being incompressible and uniformly transmitting pressure to uniformly press a workpiece from all directions. Isostatic pressing the electrode assembly helps the electrode material to be uniformly pressurized in all directions, thereby achieving a higher degree of compaction to improve the energy density of the battery. In addition, isostatic pressing can make the particle distribution in the electrode material more uniform, reducing the presence of large particles or sharp edges, thus reducing the possibility of internal short circuits in the electrode. Moreover, during the battery manufacturing process, isostatic pressing can subject each electrode assembly to the same pressure conditions, thereby improving the consistency of electrode performance.

[0067] The isostatic pressing film 30 is a key component in isostatic pressing. It can withstand extremely high pressures without deformation while ensuring uniform pressure on the object to be processed. The isostatic pressing film 30 includes a first isostatic pressing film 31 and a second isostatic pressing film 32 that are oppositely arranged. It can be understood that the first isostatic pressing film 31 and the second isostatic pressing film 32 are oppositely arranged in space, and the two can be in a parallel state. In some embodiments, the first isostatic pressing film 31 is above the second isostatic pressing film. During the isostatic pressing process of the electrode assembly, the first isostatic pressing film 31 and the second isostatic pressing film 32 being oppositely arranged can wrap the electrode assembly therein, thereby reducing the risk of media such as liquid or gas entering or leaking during the isostatic pressing process.

[0068] The support frame 40 is a frame structure that supports and fixes the first isostatic pressing film 31 and the second isostatic pressing film 32. It can be composed of multiple rods or plates, or can be integrally formed. The first isostatic pressing film 31, the second isostatic pressing film 32, and the support frame 40 form an accommodation space for accommodating the electrode assembly. It can be understood that there is a through hole at the geometric center position of the support frame 40. Among them, the through hole can be a regular shape such as a circle or a square, or can be a polygon or other irregular shape, and the first isostatic pressing film 31, the second isostatic pressing film 32, and the central through hole 41 provide a placement space for the electrode assembly.

[0069] The clamping assembly 50 includes a first pressing frame 51 and a second pressing frame 52. Among them, the first pressing frame 51 and the second pressing frame 52 can be frame-like structures with the same size and shape. Along the clamping direction of the clamping assembly 50, the first pressing frame 51, the first isostatic pressing film 31, the support frame 40, the second isostatic pressing film 32, and the second pressing frame 52 are arranged in sequence. Both the first pressing frame 51 and the second pressing frame 52 are hollow structures to allow the isostatic pressing medium to contact the isostatic pressing film 30. It can be understood that the hollow structure means that there is a hollow part or cavity inside the first pressing frame 51 and the second pressing frame 52, and the isostatic pressing medium (which can be gas or liquid) can directly contact the isostatic pressing film 30 through the hollow structure, and then uniformly press the electrode assembly to complete the isostatic pressing process. Among them, the hollow part or cavity of the hollow structure can be set at the geometric center position of the first pressing frame 51 and the second pressing frame 52, and the shape can be circular or square. In addition, both the first pressing frame 51 and the second pressing frame 52 can be one or a combination of steel plates, aluminum plates, alumina ceramic plates, silicon carbide ceramic plates, PC (polycarbonate) plates, and PMMA (polymethyl methacrylate) plates.

[0070] The detachable method is a method and way to separate two or more components that are connected or assembled together. The detachable method includes mechanical connection methods (such as bolt connection, snap connection, and pin connection), magnetic connection methods (such as permanent magnet connection and electromagnetic connection), and other connection methods. The first isostatic pressing film 31 is detachably clamped between the first pressing frame 51 and the support frame 40, and the second isostatic pressing film 32 is detachably clamped between the second pressing frame 52 and the support frame 40. It can be understood that the first isostatic pressing film 31 is in the middle position between the first pressing frame 51 and the support frame 40 and is relatively fixed, and the second isostatic pressing film 32 is in the middle position between the second pressing frame 52 and the support frame 40 and is relatively fixed. At the same time, the relatively fixed structures can be separated by a set method or structure, and it will not cause irreparable damage to each component.

[0071] By detachably clamping the first isostatic pressing film 31 between the first pressing frame 51 and the support frame 40, and detachably clamping the second isostatic pressing film 32 between the second pressing frame 52 and the support frame 40, it is beneficial to separate the relatively fixed structures, and it will not cause irreparable damage to the isostatic pressing film 30, maintaining the structural integrity of the isostatic pressing film 30, facilitating the reuse of the isostatic pressing film 30 and thus reducing the cost of isostatic pressing treatment; in addition, the detachable design can make the isostatic pressing film 30 easier to separate and recycle, thereby improving the resource utilization rate and reducing resource consumption.

[0072] Please refer to Figures 5 - 9 , Figure 5 which is one of the simple schematic diagrams of the isostatic pressing device in some embodiments of this application. Figure 6The second simplified schematic diagram of the isostatic pressing device according to some embodiments of the present application. Figure 7 The third simplified schematic diagram of the isostatic pressing device according to some embodiments of the present application. Figure 8 The fourth simplified schematic diagram of the isostatic pressing device according to some embodiments of the present application. Figure 9 The fifth simplified schematic diagram of the isostatic pressing device according to some embodiments of the present application.

[0073] According to some embodiments of the present application, as Figures 5 - 9 shown, a seal 60 is provided between at least one of the first isostatic pressing film 31 and the support frame 40, between the first isostatic pressing film 31 and the first pressing frame 51, between the second isostatic pressing film 32 and the support frame 40, and between the second isostatic pressing film 32 and the second pressing frame 52.

[0074] A seal is a material or part of a component that prevents fluid or solid particles from leaking between adjacent mating surfaces and prevents external impurities such as dust and moisture from entering the interior of the machine equipment. In the present application, the seal 60 refers to a structure that prevents the isostatic pressing medium from leaking or flowing into the accommodation space during the isostatic pressing process of the electrode assembly, thereby causing damage to the electrode assembly. In some embodiments, the seal 60 is made of an elastic material, which can specifically be nitrile rubber, fluororubber, silicone rubber, or ethylene propylene diene monomer rubber, etc. A seal 60 is provided between at least one of the first isostatic pressing film 31 and the support frame 40, between the first isostatic pressing film 31 and the first pressing frame 51, between the second isostatic pressing film 32 and the support frame 40, and between the second isostatic pressing film 32 and the second pressing frame 52. It can be understood that a seal 60 is provided between one of the first isostatic pressing film 31 and the support frame 40, between the first isostatic pressing film 31 and the first pressing frame 51, between the second isostatic pressing film 32 and the support frame 40, and between the second isostatic pressing film 32 and the second pressing frame 52, or seals 60 can be provided at multiple locations simultaneously. It can be understood that the structural forms of the seals 60 at different positions can be the same or different, as long as the sealing between the contact surfaces can be achieved.

[0075] In the isostatic pressing process, by providing the seal 60, the sealing effect can be improved and impurities can be prevented from entering the accommodation space containing the electrode assembly, thereby reducing the risk of direct contact between the isostatic pressing medium or impurities and the electrode assembly, which is beneficial to improving the isostatic pressing effect of the electrode assembly.

[0076] According to some embodiments of the present application, as Figure 5 shown, the seal 60 protrudes from the surface of the first pressing frame 51 facing the first isostatic pressing film 31.

[0077] In other embodiments, the seal 60 protrudes from the surface of the second pressing frame 52 facing the second isostatic pressing film 32.

[0078] The seal 60 can be an independently prepared part and protrude from the surface of the first pressing frame 51 facing the first isostatic pressing film 31 during installation. For example, it can be achieved by any feasible means such as pasting or clamping. In some other embodiments, the seal 60 can also be integrally formed with the first pressing frame 51. Here, the seal 60 and the first pressing frame 51 are respectively parts of this integrally formed member. It can be understood that in this preparation method, the performance of the seal 60 can be different from that of the first pressing frame 51. For example, the elastic modulus of the seal 60 is greater than that of the first pressing frame 51, so as to achieve sealing through elastic deformation when being pressed. In another example, the seal 60 can also achieve the sealing purpose in other ways. For example, the seal 60 is set as a labyrinth seal to achieve sealing under the condition of contacting and being pressed against the first isostatic pressing film 31.

[0079] Similarly, the seal 60 can also protrude from the surface of the second pressing frame 52 facing the second isostatic pressing film 32 either simultaneously or non - simultaneously. It can be understood that the seal 60 can be provided on one of the first pressing frame 51 and the second pressing frame 52, or both. The cross - section of the seal 60 perpendicular to its extending direction can be set as needed. Among them, it can be a hemispherical, conical or cubic structure protruding from the first pressing frame 51 or the second pressing frame 52.

[0080] Thereby, the sealing effect between the isostatic pressing film 30 and the clamping assembly 50 can be improved, the possibility of direct contact between the isostatic pressing medium or impurities and the electrode assembly can be reduced, which is beneficial to the densification treatment of the electrode assembly.

[0081] According to some embodiments of the present application, as Figure 6 shown, the seal 60 protrudes from the surface of the support frame 40 facing the first isostatic pressing film 31.

[0082] In some other embodiments, the seal 60 protrudes from the surface of the support frame 40 facing the second isostatic pressing film 32.

[0083] The seal 60 can be provided on the surface of the support frame 40 facing either the first isostatic pressing film 31 or the second isostatic pressing film 32, or seals 60 protrude from both surfaces of the support frame 40. The seal 60 provided on the support frame 40 can have the same or different structural forms as the seal 60 provided on the clamping assembly 50. The present application does not limit this.

[0084] Thereby, the sealing effect between the isostatic pressing film 30 and the support frame 40 can be improved, the possibility of direct contact between the isostatic pressing medium or impurities and the electrode assembly can be reduced, which is beneficial to the isostatic pressing treatment of the electrode assembly, thereby improving the energy density and structural stability of the electrode assembly.

[0085] According to some embodiments of the present application, as Figure 7 shown, the seal 60 protrudes from at least one surface of the first isostatic pressure film 31 and the second isostatic pressure film 32 facing the support frame 40 and / or the surface facing away from the support frame 40.

[0086] Since sealing is required on both sides of the isostatic pressure film, the seal 60 can be provided on the surface of the isostatic pressure film, for example, on one side surface or both side surfaces of at least one of the first isostatic pressure film 31 and the second isostatic pressure film 32.

[0087] It can be understood that the seal 60 protruding from the surface of the isostatic pressure film 30 can be provided simultaneously with the seal 60 protruding from the clamping assembly 50 (the first pressing frame 51 and the second pressing frame 52), or can be provided simultaneously with the seal 60 protruding from the support frame 40, and can be specifically set according to actual needs and sealing requirements. The embodiments of the present application do not limit this.

[0088] Thereby, the sealing performance of the isostatic pressing device 400 during isostatic pressing can be improved, the possibility of direct contact between the isostatic pressing medium or impurities and the electrode assembly can be reduced, which is beneficial to the isostatic pressing treatment of the electrode assembly, and thus the energy density and structural stability of the electrode assembly can be improved.

[0089] According to some embodiments of the present application, the seal 60 is integrally formed with the first isostatic pressure film 31 or the second isostatic pressure film 32.

[0090] Integrally formed means that multiple parts of a product or component are processed and formed at one time through a specific process, rather than assembled from multiple independent components. In the present application, it means that the seal 60 and the first isostatic pressure film 31 or the second isostatic pressure film 32 are a one-time structure, rather than formed by assembling individual components.

[0091] In some embodiments, although the seal 60 is integrally formed with the isostatic pressure film 30, the materials of the two can be different or the same. In other embodiments, although the seal 60 is integrally formed with the isostatic pressure film 30, there may also be differences in the mechanical properties of the two, such as different elastic moduli.

[0092] Integrally forming is beneficial to reducing the connection links between the seal 60 and the first isostatic pressure film 31 or the second isostatic pressure film 32, beneficial to improving the strength and durability of the seal 60, thereby improving the sealing performance of the isostatic pressing device 400 during isostatic pressing, and further improving the isostatic pressing treatment effect of the electrode assembly.

[0093] According to some embodiments of the present application, as Figure 8As shown, the seal 60 protrudes from one of the clamping assembly 50 and the support frame 40, and a groove 61 for mating with the seal 60 is provided in the other of the clamping assembly 50 and the support frame 40 where the seal 60 is not provided.

[0094] As Figure 8 shown, seals 60 are provided on the surfaces of the first pressing frame 51 and the second pressing frame 52 in the clamping assembly 50, and grooves 61 corresponding to the seals 61 are provided on the support frame 40. Among them, the grooves 61 and the seals 60 are provided in a mating manner, which can be used to position the seals 60 and assist the seals 60 to achieve sealing. Specifically, the grooves 61 and the seals 60 are in a mating relationship in terms of position, quantity, size, and shape. In some cases, the cross-sectional shape of the seal 60 is a hemispherical structure, and correspondingly, the groove 61 is a hemispherical groove 61.

[0095] In this way, during installation, by applying pressure, the seal 60 and part of the isostatic pressure film 30 can be pressed into the groove 61, and through the elastic deformation of the seal 60 or the isostatic pressure film 30, the sealing of the installation interface is achieved.

[0096] By providing the groove 61 that mates with the seal 60, it is beneficial to the precise positioning and close fitting between the clamping assembly 50 and the support frame 40, thereby improving the reliability of the seal and further improving the isostatic pressing treatment effect of the electrode assembly.

[0097] According to some embodiments of the present application, as Figure 8 shown, the seal 60 is configured to continuously extend circumferentially along the central through-hole 41 and is arranged end to end.

[0098] The circumferential continuous extension of the central through-hole 41 can be understood as that, with the central axis of the central through-hole 41 as the reference, the seal 60 is continuously arranged in the circumferential direction around this central axis, and end to end specifically means that after the seal 60 continuously extends circumferentially along the central through-hole 41 for one week, the starting distribution position and the ending distribution position are connected together, that is, the extension path of the seal 60 is a closed curve.

[0099] In some embodiments, the number of seals can be one or multiple. Among them, multiple seals can be distributed on different installation interfaces (i.e., between two surfaces that are in contact with each other and need to be sealed), or can be distributed on the same installation interface at intervals in the radial direction of the central through-hole 41.

[0100] Thereby, it is beneficial to achieve an all-round sealing effect on the isostatic pressing device 400, effectively reducing the risk of isostatic pressing medium or external contaminants leaking into the electrode assembly, and thus improving the isostatic pressing treatment effect of the electrode assembly.

[0101] According to some embodiments of the present application, the material of the isostatic pressing film 30 is an elastic material.

[0102] An elastic material refers to a material that can undergo large deformations when subjected to external forces and can quickly return to its original shape and size when the external forces are removed. In some embodiments, the isostatic pressing film 30 can be one of mechanically sealable elastic materials such as silica gel, rubber, PE (polyethylene), PP (polypropylene), PVC (polyvinyl chloride), PU (polyurethane), PA (polyamide), etc.

[0103] The material of the isostatic pressing film 30 is set as an elastic material, which is beneficial to uniformly transmit pressure and can buffer and protect the electrode assembly, and can adapt to the shape of the electrode assembly, thereby improving the effectiveness and uniformity of pressure transmission during the isostatic pressing process.

[0104] According to some embodiments of the present application, as Figure 4 shown, the isostatic pressing device 400 further includes: a plurality of mounting holes 70 arranged at intervals along the circumference of the central through hole 41, and fasteners 71 arranged in the mounting holes 70; the fasteners 71 are used to sandwich the first isostatic pressing film 31 between the first pressing frame 51 and the support frame 40, or / and, sandwich the second isostatic pressing film 32 between the second pressing frame 52 and the support frame 40.

[0105] The mounting holes 70 are arranged at intervals along the circumference of the central through hole 41. It can be understood that, with the central axis of the central through hole 41 as the reference, the mounting holes 70 are arranged at a certain interval in the circumferential direction around the central axis.

[0106] In some embodiments, the mounting holes 70 can sequentially penetrate through the first pressing frame 51, the first isostatic pressing film 31, the support frame 40, the second isostatic pressing film 32, and the second pressing frame 52. In other embodiments, the mounting holes 70 can sequentially penetrate through the first pressing frame 51, the support frame 40, and the second pressing frame 52, and the first isostatic pressing film 31 and the second isostatic pressing film 32 are not penetrated by the mounting holes 70.

[0107] The fastener 71 is a mechanical connection for achieving a fastening connection. In some embodiments, the fastener 71 can be a bolt passing through the mounting hole 70. The fastener 71 is used to sandwich the first isostatic pressing film 31 between the first pressing frame 51 and the support frame 40, or / and, sandwich the second isostatic pressing film 32 between the second pressing frame 52 and the support frame 40. It can be understood that the fastener 71 can achieve the clamping and fixing of at least one of the first isostatic pressing film 31 and the second isostatic pressing film 32.

[0108] By setting the fastener 71 to achieve the clamping and fixing of the isostatic pressing film 30, it is beneficial to improve the connection strength and maintain the structural integrity of the isostatic pressing film 30, facilitate the reuse of the isostatic pressing film 30, and thus reduce the cost of isostatic pressing treatment.

[0109] According to some embodiments of the present application, as Figures 5 - 9 shown, a seal 60 is provided between the first isostatic pressing film 31 and the support frame 40, between the first isostatic pressing film 31 and the first pressing frame 51, between the second isostatic pressing film 32 and the support frame 40, and between the second isostatic pressing film 32 and the second pressing frame 52, and the mounting hole 70 is located on a side of the seal 60 away from the central through hole 41.

[0110] A seal 60 is provided between at least one of the first isostatic pressing film 31 and the support frame 40, between the first isostatic pressing film 31 and the first pressing frame 51, between the second isostatic pressing film 32 and the support frame 40, and between the second isostatic pressing film 32 and the second pressing frame 52. It can be understood that a seal 60 is provided between one of the first isostatic pressing film 31 and the support frame 40, between the first isostatic pressing film 31 and the first pressing frame 51, between the second isostatic pressing film 32 and the support frame 40, and between the second isostatic pressing film 32 and the second pressing frame 52, two of them are provided with seals 60, three of them are provided with seals 60, or all four of them are provided with seals 60. The mounting hole 70 is located on a side of the seal 60 away from the central through hole 41. It can be understood that compared with the setting position of the seal 60, the mounting hole 70 is arranged at a more peripheral position.

[0111] The mounting hole 70 is located on a side of the seal 60 away from the central through hole 41, which is beneficial to balancing the pressure of the seal 60 and helping to accurately position and closely fit the various components of the isostatic pressing device 400, thereby improving the reliability of the seal and further improving the isostatic pressing treatment effect of the electrode assembly.

[0112] According to some embodiments of the present application, as Figure 3 shown, a first hole is provided in the central region of the first pressing frame 51, and a second hole is provided in the central region of the second pressing frame 52; wherein, the positive projection of the central through hole 41 along the first direction X completely falls within the positive projection range of the first hole along the first direction X, and / or the positive projection of the central through hole 41 along the first direction X completely falls within the positive projection range of the second hole along the first direction X; the first direction X is the stacking direction of the first pressing frame 51, the support frame 40, and the second pressing frame 52.

[0113] The first hole and the second hole are respectively arranged at the geometric center positions of the first pressing frame 51 and the second pressing frame 52. Among them, the first hole and the second hole can be circular holes, square holes or other irregular shapes of the same shape, or different shapes. Along the first direction X, the positive projection of the first hole or the second hole can completely cover the positive projection of the central through hole 41.

[0114] Thus, it is beneficial for the isostatic pressing medium to directly contact the isostatic pressing film 30 through the first hole and the second hole, and then uniformly press the electrode assembly to complete the isostatic pressing process, thereby improving the isostatic pressing effect of the electrode assembly.

[0115] According to some embodiments of the present application, the orthographic projections of the first hole and the second hole completely coincide.

[0116] The orthographic projections of the first hole and the second hole completely coincide, which can be understood as that along the projection line in the first direction X, the shapes, sizes, and positions of the orthographic projection diagrams of the first hole and the second hole are completely the same.

[0117] The complete coincidence of the orthographic projections of the first hole and the second hole is beneficial to improving the assembly accuracy of the first pressing frame 51 and the second pressing frame 52, and is also beneficial for the isostatic pressing medium to directly contact the isostatic pressing film 30 through the first hole and the second hole to achieve uniform stress on the electrode assembly, thereby improving the isostatic pressing effect of the electrode assembly.

[0118] According to some embodiments of the present application, along the first direction X, the ratio of the orthographic projection area of the first hole to the orthographic projection area of the first pressing frame 51 is greater than or equal to 40% and less than or equal to 90%; and / or along the first direction X, the ratio of the orthographic projection area of the second hole to the orthographic projection area of the second pressing frame 52 is greater than or equal to 40% and less than or equal to 90%.

[0119] Along the first direction X, the ratio of the orthographic projection area of the first hole to the orthographic projection area of the first pressing frame 51 can be 40%, 50%, 70%, or 90%, and the ratio of the orthographic projection area of the second hole to the orthographic projection area of the second pressing frame 52 can be 40%, 50%, 70%, or 90%.

[0120] By reasonably setting the first hole and the second hole, it is beneficial to improve the connection strength of each component of the isostatic pressing device 400 while taking into account the direct contact between the isostatic pressing medium and the isostatic pressing film 30 through the first hole and the second hole to achieve uniform stress on the electrode assembly, thereby improving the isostatic pressing effect of the electrode assembly.

[0121] According to some embodiments of the present application, as Figure 3 and Figure 4 shown, the support frame 40 further includes a ventilation hole 42, and the ventilation hole 42 communicates the accommodation space with the external gas.

[0122] The ventilation hole 42 is disposed through the support frame 40. Among them, the shape of the ventilation hole 42 can be circular, square, or other irregular shapes, etc. The first isostatic pressing film 31, the second isostatic pressing film 32, and the support frame 40 form an accommodation space for accommodating the electrode assembly. Through the ventilation hole 42, a gas flow channel is established between the accommodation space and the external environment, thereby realizing gas exchange.

[0123] By providing the vent hole 42, it is conducive to discharging the excess gas in the accommodation space, thereby achieving uniform pressure transmission and reducing the impact of oxygen or other gases on the electrode assembly, thus improving the isostatic pressing treatment effect of the electrode assembly.

[0124] According to some embodiments of the present application, the isostatic pressing device 400 further includes a negative pressure generating component, which is connected to the vent hole 42 for sucking the gas in the accommodation space.

[0125] The negative pressure generating component is a device capable of creating a negative pressure environment. In some embodiments, the negative pressure generating component can be a vacuum pump and includes a vacuum interface, and the vacuum interface is connected to the vent hole 42 through a pipeline. In some embodiments, the negative pressure generating component sucks the gas in the accommodation space to maintain the vacuum degree of the accommodation space containing the electrode assembly between -101 kPa (kilopascals) and -80 kPa (kilopascals).

[0126] By providing a negative pressure generating component for sucking the gas in the accommodation space, it is conducive to achieving the uniformity of the pressure received by the electrode assembly during the isostatic pressing process and reducing the risk of oxidation of the electrode assembly, thus improving the densification effect of the electrode assembly.

[0127] According to some embodiments of the present application, a one-way valve is provided in the vent hole 42, and the one-way valve is configured to only allow the gas in the accommodation space to flow out unidirectionally.

[0128] The one-way valve is a valve structure that only allows the fluid to flow in a specific direction. In some embodiments, the one-way valve can be a straight-through one-way valve, an angle one-way valve or a ball check valve.

[0129] Providing a one-way valve in the vent hole 42 is conducive to reducing the risk of gas backflow and maintaining the air pressure environment of the accommodation space, thereby achieving the uniformity of the pressure received by the electrode assembly during the isostatic pressing process and further improving the isostatic pressing treatment effect of the electrode assembly.

[0130] According to some embodiments of the present application, a first coating is provided on the surface of the isostatic pressing film 30 on the side away from the support frame 40, and the first coating is used to reduce the adhesion between the isostatic pressing film 30 and the isostatic pressing medium.

[0131] The first coating can be an oil-repellent layer. As a composite coating material, it has an extremely low surface tension and can make liquids (such as water and grease) form a relatively high contact angle on its surface, thereby achieving the effect of hydrophobic and oil-repellent. In some embodiments, the material of the oil-repellent layer is nano-silica or fluorine-containing material.

[0132] By coating the first coating, the adhesion between the isostatic pressing film 30 and the isostatic pressing medium can be reduced, which helps to clean and reuse the isostatic pressing film 30 and is conducive to reducing the isostatic pressing treatment cost of the electrode assembly.

[0133] According to some embodiments of the present application, a second coating is provided on the surface of the isostatic pressing film 30 close to the support frame 40, and the second coating is used to reduce the adhesion between the isostatic pressing film 30 and the electrode assembly.

[0134] The second coating may be an anti-adhesion coating. As a special functional coating, it can significantly reduce the adhesion force between the object surface and other substances, thereby realizing anti-sticking, anti-fouling, and self-cleaning functions. In some embodiments, the anti-adhesion coating is polytetrafluoroethylene (PTFE), perfluoroethylene propylene (FEP), polyvinylidene fluoride (PVDF), etc.

[0135] By providing a second coating on the surface of the isostatic pressing film 30 close to the support frame 40, the adhesion between the isostatic pressing film 30 and the electrode assembly can be reduced, which helps the self-cleaning of the electrode assembly, thereby reducing the risk of damage and maintaining the performance of the electrode assembly.

[0136] The embodiments of the present application provide an isostatic pressing device. The isostatic pressing device includes an isostatic pressing device 400 and a providing device as described in the foregoing embodiments, and the providing device is used to provide an isostatic pressing medium.

[0137] In addition to the isostatic pressing device 400 and the providing device, the isostatic pressing device may further include an isostatic pressing closed container for placing the isostatic pressing device 400 that can clamp the electrode assembly. The isostatic pressing medium may be a liquid medium such as water or oil, or a gas medium such as argon, nitrogen, or helium. In some embodiments using a liquid medium as the isostatic pressing medium, the providing device may include a liquid replenishing tank, a pipeline system, and a pressurizing device. The liquid replenishing tank is used to store the isostatic pressing medium, and the pipeline system is responsible for transporting the medium in the liquid replenishing tank to the pressurizing device and transporting the pressurized medium to the isostatic pressing closed container, so as to perform isostatic pressing treatment on the electrode assembly. The related technical effects have been described above and will not be repeated here.

[0138] As Figures 4 - 9 shown, the present application provides an isostatic pressing device 400 for performing isostatic pressing treatment on an electrode assembly. The isostatic pressing device 400 includes an isostatic pressing film 30, a support frame 40, a clamping assembly 50, and a negative pressure generating component.

[0139] The isostatic pressing film 30 made of an elastic material includes a first isostatic pressing film 31 and a second isostatic pressing film 32 arranged opposite to each other. Among them, a first coating is provided on the surface of the isostatic pressing film 30 away from the support frame 40, and the first coating is used to reduce the adhesion between the isostatic pressing film 30 and the isostatic pressing medium. A second coating is provided on the surface of the isostatic pressing film 30 close to the support frame 40, and the second coating is used to reduce the adhesion between the isostatic pressing film 30 and the electrode assembly.

[0140] The support frame 40 has a central through-hole 41 and a vent hole 42, and the support frame 40 is located between the first isostatic pressure film 31 and the second isostatic pressure film 32. The first isostatic pressure film 31, the second isostatic pressure film 32, and the support frame 40 form a receiving space for receiving the electrode assembly. A plurality of mounting holes 70 are circumferentially spaced apart in the central through-hole 41, and fasteners 71 are disposed in the mounting holes 70. Among them, the fasteners 71 are used to clamp the first isostatic pressure film 31 between the first pressing frame 51 and the support frame 40, and clamp the second isostatic pressure film 32 between the second pressing frame 52 and the support frame 40. The mounting holes 70 are located on the side of the seal 60 away from the central through-hole 41. The vent hole 42 can communicate the receiving space with the external gas, and a one-way valve is provided in the vent hole 42. The one-way valve is configured to only allow the gas in the receiving space to flow out unidirectionally.

[0141] The clamping assembly 50 includes a first pressing frame 51 on the side of the first isostatic pressure film 31 away from the support frame 40, and a second pressing frame 52 on the side of the second isostatic pressure film 32 away from the support frame 40. Both the first pressing frame 51 and the second pressing frame 52 are hollow structures to allow the isostatic pressure medium to contact the isostatic pressure film 30. A first hole is provided in the central region of the first pressing frame 51, and a second hole is provided in the central region of the second pressing frame 52. Among them, the positive projection of the central through-hole 41 along the first direction X completely falls within the positive projection range of the first hole along the first direction X, and the positive projection of the central through-hole 41 along the first direction X completely falls within the positive projection range of the second hole along the first direction X. In addition, along the first direction X, the ratio of the positive projection area of the first hole to the positive projection area of the first pressing frame 51 is greater than or equal to 40% and less than or equal to 90%; and / or along the first direction X, the ratio of the positive projection area of the second hole to the positive projection area of the second pressing frame 52 is greater than or equal to 40% and less than or equal to 90%.

[0142] The negative pressure generating component is connected to the vent hole 42 to suck the gas in the receiving space.

[0143] In addition, a seal 60 is provided between at least one of the first isostatic pressure film 31 and the support frame 40, between the first isostatic pressure film 31 and the first pressing frame 51, between the second isostatic pressure film 32 and the support frame 40, and between the second isostatic pressure film 32 and the second pressing frame 52. The seal 60 is configured to continuously extend circumferentially along the central through-hole 41 and be arranged end to end.

[0144] The isostatic pressing method of the electrode assembly of the present application will be described below in conjunction with a specific embodiment.

[0145] (1) Use the first pressing frame and the second pressing frame with dimensions of 200 millimeters (mm) * 100 millimeters (mm), use rubber with dimensions of 200mm * 100mm * 2mm as the isostatic pressing film, place the electrode assembly with dimensions of 180mm * 80mm * 5mm in the support frame, place the first isostatic pressing film and the second isostatic pressing film on the upper and lower sides along the first direction respectively, and use the first pressing frame and the second pressing frame to clamp and seal the outside of the isostatic pressing film with bolts;

[0146] (2) Connect the one-way valve to the vacuum interface of the negative pressure generating component, set the vacuum degree to -99 kilopascals (kPa), and keep it for 30 seconds (s) to evacuate the electrode assembly in the isostatic pressing device;

[0147] (3) Place the sealed isostatic pressing device into the isostatic pressing closed container, and perform isostatic pressing treatment at 90 degrees Celsius (℃), 900 megapascals (MPa), and 5 minutes (min) to densify the electrode assembly;

[0148] (4) Remove the bolts, take out the electrode assembly, and recycle the isostatic pressing device.

[0149] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An isostatic pressing device for isostatic pressing an electrode assembly, characterized in that: The isostatic pressing device comprises: The isostatically pressed film comprises a first isostatically pressed film and a second isostatically pressed film which are arranged opposite to each other; a support frame having a central through hole, the support frame being located between the first isostatically pressed film and the second isostatically pressed film, the first isostatically pressed film, the second isostatically pressed film and the support frame forming a receiving space for receiving the electrode assembly; A clamping assembly, comprising a first pressing frame located on a side of the first isostatically pressed film away from the support frame, and a second pressing frame located on a side of the second isostatically pressed film away from the support frame, wherein both the first pressing frame and the second pressing frame are hollow structures to allow isostatically pressed media to contact the isostatically pressed film; The first isostatic pressing film is detachably clamped between the first pressing frame and the supporting frame, and the second isostatic pressing film is detachably clamped between the second pressing frame and the supporting frame.

2. The isostatic pressing device according to claim 1, characterized in that: A seal is provided at least one of between the first isostatically pressed film and the support frame, between the first isostatically pressed film and the first pressing frame, between the second isostatically pressed film and the support frame, and between the second isostatically pressed film and the second pressing frame.

3. The isostatic pressing device according to claim 2, characterized in that: The sealing member is protrudingly disposed on a surface of the first pressing frame facing the first isostatically pressed film, and / or the sealing member is protrudingly disposed on a surface of the second pressing frame facing the second isostatically pressed film.

4. The isostatic pressing device according to claim 2, characterized in that: The sealing member is protrudingly disposed on a surface of the support frame facing the first isostatically pressed film, and / or the sealing member is protrudingly disposed on a surface of the support frame facing the second isostatically pressed film.

5. The isostatic pressing device according to claim 2, characterized in that: The sealing member is protrudingly disposed on a surface of at least one of the first isostatically pressed film and the second isostatically pressed film that faces the support frame and / or a surface that faces away from the support frame.

6. The isostatic pressing device according to claim 5, characterized in that: The sealing member is integrally formed with the first isostatically pressed film or the second isostatically pressed film.

7. The isostatic pressing device according to claim 2, characterized in that: The sealing member is protrudingly disposed on one of the clamping assembly and the supporting frame, and the one of the clamping assembly and the supporting frame where the sealing member is not disposed is provided with a groove that cooperates with the sealing member.

8. The isostatic pressing device according to any one of claims 2 to 6, characterized in that: The sealing member is configured to extend continuously along the circumference of the central through hole and be arranged end to end.

9. The isostatic pressing device according to any one of claims 1 to 6, characterized in that: The isostatically pressed film is made of elastic material.

10. The isostatic pressing device according to any one of claims 1 to 6, characterized in that: The isostatic pressing device also includes: A plurality of mounting holes arranged at intervals along the circumference of the central through hole, and fasteners arranged in the mounting holes; The fastener is used to clamp the first isostatically pressed film between the first pressing frame and the support frame, or / and to clamp the second isostatically pressed film between the second pressing frame and the support frame.

11. The isostatic pressing device according to claim 10, characterized in that: When a seal is provided at least one of between the first isostatically pressed membrane and the support frame, between the first isostatically pressed membrane and the first pressing frame, between the second isostatically pressed membrane and the support frame, and between the second isostatically pressed membrane and the second pressing frame, the mounting hole is located on a side of the seal away from the central through hole.

12. The isostatic pressing device according to any one of claims 1 to 6, characterized in that: A first hole is provided in the central area of ​​the first pressing frame, and a second hole is provided in the central area of ​​the second pressing frame; The orthographic projection of the central through hole along the first direction completely falls within the orthographic projection range of the first hole along the first direction, and / or the orthographic projection of the central through hole along the first direction completely falls within the orthographic projection range of the second hole along the first direction; The first direction is a stacking direction of the first pressing frame, the supporting frame, and the second pressing frame.

13. The isostatic pressing device according to claim 12, characterized in that: Along the first direction, the orthographic projections of the first hole and the second hole completely coincide with each other.

14. The isostatic pressing device according to claim 12, characterized in that: Along the first direction, a ratio of an orthographic projection area of ​​the first hole to an orthographic projection area of ​​the first pressing frame is greater than or equal to 40% and less than or equal to 90%; and / or Along the first direction, a ratio of an orthographic projection area of ​​the second hole to an orthographic projection area of ​​the second pressing frame is greater than or equal to 40% and less than or equal to 90%.

15. The isostatic pressing device according to any one of claims 1 to 6, characterized in that: The support frame further includes a vent hole, and the vent hole connects the accommodating space with external air.

16. The isostatic pressing device according to claim 15, characterized in that The isostatic pressing device also includes: A negative pressure generating component is connected to the vent hole and is used for sucking gas in the accommodating space.

17. The isostatic pressing device according to claim 15, characterized in that A one-way valve is arranged in the vent hole, and the one-way valve is configured to only allow the gas in the accommodating space to flow outward in one direction.

18. The isostatic pressing device according to any one of claims 1 to 6, characterized in that: A first coating is provided on a surface of the isostatically pressed film away from the support frame, and the first coating is used to reduce adhesion between the isostatically pressed film and the isostatically pressed medium.

19. The isostatic pressing device according to claim 18, characterized in that A second coating is provided on the surface of the isostatically pressed film on one side close to the support frame, and the second coating is used to reduce adhesion between the isostatically pressed film and the electrode assembly.

20. An isostatic pressing device, characterized in that: The isostatic pressing equipment comprises the isostatic pressing device according to any one of claims 1 to 19 and a providing device, wherein the providing device is used to provide an isostatic pressing medium.

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