Isostatic pressing jig and isostatic pressing device

Abstract

An isostatic pressing jig, comprising a mounting canister (10) and a plurality of moving plates (20). The mounting canister (10) has a mounting cavity (11) extending in a first direction, the plurality of moving plates (20) being movably located in the mounting cavity (11). Sealed cavities (30) are formed between adjacent moving plates (20) and the inner side wall of the mounting canister (10), batteries (100) being located in the sealed cavities (30), and the moving direction of the moving plates (20) being the first direction. Since the isostatic pressing jig comprises the plurality of moving plates (20), the batteries (100) can be placed between every two adjacent moving plates (20), that is, one isostatic pressing jig can clamp the multiple batteries (100), allowing for a relatively high utilization rate of the isostatic pressing jig. The present application also relates to an isostatic pressing device.

Description

Isostatic pressing jig and isostatic pressing device

[0001] Cross-reference to related applications

[0002] This application is based on the Chinese Patent Application No. 202421842764.0 entitled "Isostatic pressing jig and isostatic pressing device" filed on August 01, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of battery, in particular to an isostatic pressing jig and an isostatic pressing device. BACKGROUND

[0004] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.

[0005] Solid-state batteries are a type of battery that uses solid electrodes and solid electrolytes. Solid-state batteries have high energy density, higher safety and stability, and good development prospects in the battery field. Isostatic pressing can ensure the ion channel of the solid-solid interface and is an important procedure in the preparation of solid-state batteries. By placing the battery in a sealed container filled with a pressurized medium and using a pressurization system to apply equal pressure to the battery, the distance between molecules is reduced and the density is increased without changing the external shape, thereby improving the physical properties of the battery and achieving densification of the battery.

[0006] In related technologies, the battery is clamped by the isostatic pressing jig, and then the isostatic pressing jig and the battery are placed in a sealed container for isostatic pressing. However, the isostatic pressing jig can only clamp one battery at a time, and the utilization rate of the isostatic pressing jig is low.

[0007] SUMMARY

[0008] The present application aims to at least solve one of the technical problems existing in the background art. To this end, one object of the present application is to provide an isostatic pressing jig and an isostatic pressing device to improve the utilization rate of the isostatic pressing jig.

[0009] Embodiments of the first aspect of the present application provide an isostatic pressing jig configured to clamp a battery, the isostatic pressing jig comprising: a mounting cylinder having a mounting cavity extending in a first direction, the mounting cavity having at least one opening; a plurality of moving plates arranged along the first direction, the moving plates being movably located in the mounting cavity, a sealed cavity being formed between adjacent moving plates and an inner side wall of the mounting cylinder, the battery being located in the sealed cavity, and a moving direction of the moving plates being the first direction.

[0010] In the technical scheme of the embodiment of the application, the battery is placed between adjacent moving plates, and then the isostatic pressing jig and the battery are placed in the closed container filled with the pressurizing medium, the pressurizing medium in the closed container is pressurized by the booster pump, the pressurizing medium pushes the moving plates to move, and the moving plates pressurize the battery, so that the densification treatment of the solid-state battery is realized. Since the isostatic pressing jig comprises a plurality of moving plates, the battery can be placed between each adjacent two moving plates, that is, one isostatic pressing jig can clamp a plurality of batteries, and the utilization rate of the isostatic pressing jig is high.

[0011] In some embodiments, the mounting cylinder has a gas permeable hole in communication with the mounting cavity, and the isostatic pressing jig further comprises a sealing element located in the gas permeable hole and configured to block the gas permeable hole. After the moving plates and the battery are placed in the mounting cavity, part of the excess air in the mounting cavity can be extracted through the gas permeable hole, and then the sealing element is used to block the gas permeable hole. Then, the isostatic pressing jig and the battery are placed in the closed container filled with the pressurizing medium. At this time, since the mounting cavity is in a state of negative pressure, the pressurizing medium can more easily push the moving plates to move, so that the moving plates pressurize the battery. After the densification treatment of the battery, gas is blown into the mounting cavity through the gas permeable hole, so that the pressure in the mounting cavity increases and pushes the moving plates to move towards the opening of the mounting cavity, so that the moving plates can be discharged from the mounting cavity, facilitating disassembly and removal of the battery.

[0012] In some embodiments, the sealing element comprises a bidirectional exhaust valve. The sealing element is set as a bidirectional exhaust valve, which can extract part of the excess air in the mounting cavity through the sealing element, and can also blow gas into the mounting cavity through the sealing element. At the same time, it can be ensured that the gas permeable hole is in a blocked state during the densification treatment, and the pressurizing medium will not enter the mounting cavity through the gas permeable hole to contaminate the battery.

[0013] In some embodiments, for at least one of the plurality of moving plates, the plate surface on the side of the moving plate in contact with the battery has a storage groove, and the storage grooves of the plurality of moving plates are located on the same side of the plate surface of the moving plate in which the storage groove is located in the first direction. In order to avoid contamination of the battery by the pressurizing medium and to minimize the entry of the pressurizing medium into the sealed cavity, it is impossible to avoid the entry of the pressurizing medium into the sealed cavity. If the pressurizing medium is in contact with the battery for a long time, it may cause battery contamination. The plate surface on the side of the moving plate in contact with the battery has a storage groove, and the storage groove is located on the upper plate surface of the moving plate in which the storage groove is located. Under the action of gravity, the pressurizing medium will flow to the storage groove, avoiding long-term contact of the pressurizing medium with the battery and reducing the possibility of battery contamination caused by the pressurizing medium.

[0014] In some embodiments, the storage groove is annular, and the storage groove surrounds the edge of the moving plate. When the battery is placed on the moving plate, the storage groove also surrounds the battery. The pressurized medium can flow from the periphery of the battery to the storage groove. More pressurized medium flows to the storage groove, and less pressurized medium contacts the battery, so the possibility of contamination of the battery by the pressurized medium is reduced.

[0015] In some embodiments, for at least one of the plurality of moving plates, the side of the moving plate in contact with the battery has a limiting groove on the plate surface. In the first direction, the limiting grooves of the plurality of moving plates are located on the same side of the plate surface of the moving plate in which the limiting groove is located. The limiting groove and the storage groove are located on opposite plate surfaces of the moving plate. When the battery is located in the sealed cavity, the battery is located in the limiting groove. When the battery is located in the sealed cavity, the battery is located in the limiting groove. The limiting groove can limit the movement of the battery and improve the stability of the battery.

[0016] In some embodiments, in the first direction, the depth D of the limiting groove satisfies: 0 < D ≤ 5 mm. If the depth D of the limiting groove is set too deep, the volume of the limiting groove will be too large, which will reduce the strength of the moving plate. If the depth D of the limiting groove satisfies: 0 < D ≤ 5 mm, the battery can be limited while avoiding the influence of the limiting groove on the strength of the moving plate.

[0017] In some embodiments, the isostatic pressing jig comprises a sealing ring sleeved on the moving plate, and the sealing ring is located between the inner side wall of the mounting cylinder and the outer side wall of the moving plate. The sealing ring is arranged between the inner side wall of the mounting cylinder and the outer side wall of the moving plate, which can improve the sealing performance of the sealed cavity and reduce the possibility of the pressurized medium entering the sealed cavity.

[0018] In some embodiments, the surface of the mounting cylinder and the moving plate has an oleophobic layer. The oleophobic layer arranged on the surface of the mounting cylinder and the moving plate can reduce the contamination of the pressurized medium on the mounting cylinder and the moving plate, and can also reduce the residue of the pressurized medium on the surface of the mounting cylinder and the moving plate, thereby reducing the possibility of contamination of the battery by the pressurized medium.

[0019] In some embodiments, the material of the oleophobic layer includes one of polytetrafluoroethylene and nano zinc oxide. Polytetrafluoroethylene and nano zinc oxide are common oleophobic materials, which are inexpensive and have good oleophobic effect.

[0020] In some embodiments, the plurality of moving plates includes a first moving plate, the first moving plate is located at an end of the plurality of moving plates along the first direction, and a plate surface of the first moving plate away from the battery has a stress release groove. The plate surface of the first moving plate away from the battery has a stress release groove, the strength of the first moving plate at the stress release groove is reduced, and if the first moving plate is bent, the first moving plate is bent from the stress release groove, which can reduce the possibility of the middle part of the first moving plate being raised to a certain extent, thereby reducing the influence on the densification process of the battery.

[0021] In some embodiments, when the battery is located in the sealed cavity, a projection of the stress release groove on the first plane is close to an edge of a projection of the battery on the first plane, and the first plane is perpendicular to the first direction. By arranging the stress release groove close to the edge of the battery, if the first moving plate is bent, the first moving plate is bent from the edge close to the battery, which has less influence on the battery, thereby reducing the influence on the densification process of the middle part of the battery.

[0022] In some embodiments, the stress release groove is annular, a projection of the stress release groove on the first plane surrounds an edge of a projection of the battery on the first plane, and an inner circle of the stress release groove is located within the projection of the battery on the first plane. Since the inner circle of the stress release groove on the first plane is located within the projection of the battery on the first plane, the part of the first moving plate surrounded by the inner circle of the stress release groove is in contact with the battery, the pressure difference of this part of the first moving plate is small, and deformation generally rarely occurs. The part of the first moving plate outside the outer circle of the stress release groove has a large pressure difference, and the first moving plate generally bends from the stress release groove, that is, the first moving plate bends along the first direction into the sealed cavity around the stress release groove. Since the stress release groove surrounds the edge of the battery, the influence on the middle part of the battery is small, and the stress release groove corresponds to the Overhang of the battery, which does not have a great influence on the densification of the edge part of the battery, while ensuring the densification effect of the middle part of the battery.

[0023] In some embodiments, an outer circle of the stress release groove is located outside a projection of the battery on the first plane. The outer circle of the stress release groove is located outside the projection of the battery on the first plane, and the overlap between the stress release groove and the edge of the battery is small, which can more greatly reduce the influence of the bending of the first moving plate from the stress release groove on the densification of the edge part of the battery.

[0024] Embodiments of the second aspect of the present application provide an isostatic pressing device, the isostatic pressing device comprising the isostatic pressing jig of any one of the above embodiments, and the isostatic pressing jig is used for clamping the battery.

[0025] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clearly understood and implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0026] In the drawings, like reference numerals refer to same or similar functionalities throughout the several views, unless otherwise specified. The drawings are not necessarily to scale. It is to be understood that the drawings only depict several embodiments according to the present disclosure and should not be considered as limiting the scope of the present application. In order to make the technical solutions of the embodiments of the present application more clearly understood, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort based on the drawings.

[0027] Fig. 1 is a structural schematic diagram of an isostatic pressing jig according to some embodiments of the present application;

[0028] Fig. 2 is a front view of an isostatic pressing jig according to some embodiments of the present application;

[0029] Fig. 3 is a sectional view of A-A in Fig. 2;

[0030] Fig. 4 is a sectional view of an isostatic pressing jig according to some other embodiments of the present application;

[0031] Fig. 5 is a sectional view of an isostatic pressing jig according to some other embodiments of the present application;

[0032] Fig. 6 is a sectional view of an isostatic pressing jig according to some other embodiments of the present application;

[0033] Fig. 7 is a structural schematic diagram of a first moving plate according to some embodiments of the present application.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 10, mounting cylinder; 11, mounting cavity; 12, air vent hole; 20, moving plate; 21, storage groove; 22, limiting groove; 201, first moving plate; 30, sealing cavity; 40, sealing element; 50, sealing ring; 211, stress release groove; 100, battery; 200, first space. DETAILED DESCRIPTION

[0036] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, but cannot limit the protection scope of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0039] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0041] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application. The orientation or position of the device or element indicated, and therefore cannot be understood as limiting the embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mount", "connect", "connect", "fix" and other terms should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] At present, from the development of market situation, the application of power battery is more and more widely. Power battery is not only applied to energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0045] The solid-state battery is formed by the solid-state electrolyte transmitting lithium ions between the positive and negative electrodes to form an electric current. The isostatic pressing technology can realize the densification of the solid-state battery to ensure the ion channel of the solid-solid interface of the solid-state battery. When the battery is subjected to isostatic pressing, the battery is generally placed in an isostatic pressing jig, the isostatic pressing jig is clamped with the battery, and then the isostatic pressing jig and the battery are placed in a closed container filled with a pressurizing medium. The pressurizing medium is pressurized by a booster pump to pressurize the isostatic pressing jig to pressurize the solid-state battery, thereby realizing the densification treatment of the solid-state battery.

[0046] However, the isostatic pressing jig in the related art can only clamp one solid-state battery at a time, and the utilization rate of the isostatic pressing jig is low.

[0047] Embodiments of the present application provide an isostatic pressing jig configured to clamp a battery. The isostatic pressing jig includes a mounting cylinder and a plurality of moving plates. The mounting cylinder has a mounting cavity extending in a first direction, and the mounting cavity has at least one opening. The plurality of moving plates are arranged along the first direction and movably located in the mounting cavity. A sealed cavity is formed between adjacent moving plates and the inner side wall of the mounting cylinder. The battery is located in the sealed cavity, and the moving direction of the moving plate is the first direction. The battery is placed between adjacent moving plates, and then the isostatic pressing jig and the battery are placed in a closed container filled with a pressurizing medium. The pressurizing medium is pressurized by a booster pump to pressurize the moving plate, so as to realize the densification treatment of the solid-state battery. Since the isostatic pressing jig includes a plurality of moving plates, a battery can be placed between each adjacent two moving plates, that is, one isostatic pressing jig can clamp a plurality of batteries, and the utilization rate of the isostatic pressing jig is high.

[0048] The battery made by the isostatic pressing jig and the isostatic pressing device disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship, or an aircraft.

[0049] The isostatic pressing jig provided in the embodiments of the present application is configured to be used for clamping a battery. FIG. 1 is a structural schematic diagram of the isostatic pressing jig according to some embodiments of the present application. FIG. 2 is a front view of the isostatic pressing jig according to some embodiments of the present application. FIG. 3 is a sectional view of the plane A-A in FIG. 2. In combination with FIGS. 1 to 3, the isostatic pressing jig comprises a mounting cylinder 10 and a plurality of moving plates 20. The mounting cylinder 10 has a mounting cavity 11 extending along a first direction X, and the mounting cavity 11 has at least one opening. The plurality of moving plates 20 are arranged along the first direction X, and the moving plates 20 are movably located in the mounting cavity 11. A sealing cavity 30 is formed between the adjacent moving plates 20 and the inner side wall of the mounting cylinder 10, and the battery 100 is located in the sealing cavity 30. The moving direction of the moving plates 20 is the first direction X.

[0050] In the embodiments of the present application, since the isostatic pressing jig is configured to be used for clamping a battery, the battery 100 is located in the sealing cavity 30, that is, the battery 100 is placed on the moving plates 20, and the shape of the moving plates 20 matches the shape of the battery 100, so that the space utilization of the isostatic pressing jig can be improved. The large surface of a square battery is generally rectangular, and the moving plates 20 can be rectangular plates. Since the plurality of moving plates 20 are movably arranged in the mounting cavity 11 along the first direction X, the shape of the mounting cavity 11 is a cuboid, and the shape of the mounting cylinder 10 is also a cuboid. The first direction X is the height direction of the cuboid. Exemplarily, the moving plates 20 can be round rectangular plates, and correspondingly, the side edges of the mounting cavity 11 can be provided with round corners, and the side edges of the mounting cylinder 10 can also be provided with round corners.

[0051] In other implementations of the present application, the shapes of the mounting cylinder 10, the mounting cavity 11, and the moving plates 20 can be set according to requirements, and the embodiments of the present application do not limit this.

[0052] In some embodiments of the present application, the mounting cavity 11 has one opening, and the sealing cavities 30 are also formed between the moving plates 20 and the inner side wall and the inner bottom wall of the mounting cylinder 10. The battery can be placed between the inner bottom wall of the mounting cylinder 10 and the moving plates 20, or between the adjacent moving plates 20.

[0053] In some other embodiments of the present application, the mounting cavity 11 has two openings, and the two openings are arranged along the first direction X. In this case, the battery 100 can be placed between the adjacent moving plates 20.

[0054] In use of the isostatic pressing jig provided in the embodiment of the application, the moving plate 20 can be placed in the installation cavity 11 first, and then the battery 100 is placed in the installation cavity 11, so that the moving plate 20 and the battery 100 are stacked in the installation cavity 11 in sequence, and the uppermost layer along the first direction X is the moving plate 20.

[0055] In other implementations of the application, when the installation cavity 11 has one opening, the battery 100 can be placed first, and then the moving plate 20 is placed, so that the moving plate 20 and the battery 100 are stacked in the installation cavity 11 in sequence, and the uppermost layer along the first direction X is the moving plate 20.

[0056] In the embodiment of the application, since the moving plate 20 can move along the first direction X, the moving plate 20 exerts pressure on the battery 100 during the movement of the moving plate 20 along the first direction X.

[0057] In the embodiment of the application, the number of moving plates 20 is not limited and can be set according to requirements.

[0058] In use of the isostatic pressing jig provided in the embodiment of the application, the battery 100 is placed between adjacent moving plates 20, and then the isostatic pressing jig and the battery 100 are placed in the sealed container filled with the pressurizing medium, the pressurizing medium is pressurized by the booster pump, the pressurizing medium pushes the moving plate 20 to move, so that the moving plate 20 pressurizes the battery 100, thereby realizing densification treatment of the solid-state battery. Since the isostatic pressing jig includes a plurality of moving plates 20, the battery 100 can be placed between every adjacent two moving plates 20, that is, one isostatic pressing jig can clamp a plurality of batteries 100, and the utilization rate of the isostatic pressing jig is high.

[0059] In related technologies, the isostatic pressing film is used to coat the battery for isostatic pressing treatment to realize densification of the battery. In the current battery, the anode tab exceeds the cathode tab in the width direction and the length direction to a certain extent, so as to avoid too much lithium ion of the active material of the cathode tab from being separated out during the charging process and being unable to completely insert into the active material of the anode tab, thereby causing lithium precipitation on the surface of the anode tab and bringing safety risks. The area where the anode tab exceeds the cathode tab in the width direction and the length direction is referred to as Overhang. During the densification treatment of the battery, the tab and the anode tab at the Overhang are prone to be broken, causing damage of the battery. The isostatic pressing jig provided in the embodiment of the application pressurizes the battery through the moving plate 20, the thickness of the middle part of the battery is thicker, the pressure of the moving plate 20 on the edge of the battery and the tab is smaller, and the possibility of damage of the anode tab and the tab and the possibility of damage of the battery can be reduced.

[0060] According to some embodiments of the present application, referring to FIGS. 1-3, the mounting cylinder 10 has a gas-permeable hole 12 that is in communication with the mounting cavity 11, and the isostatic press further comprises a sealing member 40 located in the gas-permeable hole 12, the sealing member 40 being configured to block the gas-permeable hole 12.

[0061] Exemplarily, the gas-permeable hole 12 can be located in a side wall of the mounting cylinder 10 that is parallel to the first direction X, for example, the gas-permeable hole 12 can be located in the middle of the side wall along the first direction X.

[0062] In embodiments of the present application, after the mobile plate 20 and the battery 100 are placed in the mounting cavity 11, part of the excess air in the mounting cavity 11 can be extracted through the gas-permeable hole 12, and then the sealing member 40 is used to block the gas-permeable hole 12, and then the isostatic press and the battery 100 are placed in the sealed container filled with the pressurizing medium, at this time, since the mounting cavity 11 is in a state of negative pressure, the pressurizing medium can more easily push the mobile plate 20 to move, so that the mobile plate 20 pressurizes the battery 100. After the densification treatment of the battery, gas is blown into the mounting cavity 11 through the gas-permeable hole 12, so that the pressure in the mounting cavity 11 increases, pushing the mobile plate 20 to move towards the opening of the mounting cavity 11, so that the mobile plate 20 can be discharged from the mounting cavity 11, facilitating disassembly and removal of the battery 100.

[0063] According to some embodiments of the present application, the sealing member 40 comprises a bidirectional exhaust valve.

[0064] The sealing member 40 is set as a bidirectional exhaust valve, which can extract part of the excess air in the mounting cavity 11 through the sealing member 40, and also can blow gas into the mounting cavity 11 through the sealing member 40, while ensuring that the gas-permeable hole 12 is in a blocked state during the densification treatment, and the pressurizing medium will not enter the mounting cavity 11 through the gas-permeable hole 12 to contaminate the battery.

[0065] According to some embodiments of the present application, FIG. 4 is a sectional view of an isostatic press according to another embodiment of the present application. Referring to FIG. 4, for at least one of the plurality of mobile plates 20, the plate surface of the side of the mobile plate 20 that contacts the battery has a storage groove 21, and along the first direction X, the storage grooves 21 of the plurality of mobile plates 20 are located on the same side of the plate surface of the mobile plate 20 in which the storage grooves 21 are located.

[0066] In embodiments of the present application, the height direction of the isostatic press is the same as the first direction X, and when the mobile plate 20 and the battery 100 are mounted or disassembled, the angle between the height direction of the isostatic press and the vertical direction is less than 10°.

[0067] In the embodiments of the present application, when the installation cavity 11 has two openings arranged along the first direction X, one of the two openings is located at the top during the installation and removal of the moving plate 20 and the battery 100, and for the moving plate 20 with the storage groove 21, the storage groove 21 is located at the top surface of the moving plate 20 where the storage groove 21 is located. At the same time, since the storage grooves 21 of the plurality of moving plates 20 are located at the same side of the moving plate 20 where the storage groove 21 is located along the first direction X, for each moving plate 20 with the storage groove 21, the storage groove 21 is located at the top surface of the moving plate 20 where the storage groove 21 is located.

[0068] In the embodiments of the present application, during the densification process of the battery 100, in order to avoid the contamination of the battery 100 caused by the pressurizing medium, the entry of the pressurizing medium into the sealed cavity 30 is minimized, but it is impossible to avoid the entry of the pressurizing medium into the sealed cavity 30, and if the pressurizing medium is in contact with the battery 100 for a long time, it may cause contamination of the battery 100. The side of the moving plate 20 in contact with the battery has the storage groove 21, and the storage groove 21 is located at the top surface of the moving plate 20 where the storage groove 21 is located. Under the action of gravity, the pressurizing medium will flow to the storage groove 21, avoiding the pressurizing medium from being in contact with the battery 100 for a long time, and reducing the possibility of contamination of the battery 100 caused by the pressurizing medium.

[0069] According to some embodiments of the present application, the shape of the storage groove 21 is annular, and the storage groove 21 surrounds the edge of the moving plate 20.

[0070] In the embodiments of the present application, the shape of the moving plate 20 is a rectangular plate, and the storage groove 21 can be a rectangular annular groove. When the battery 100 is placed on the moving plate 20, the battery 100 is located within the inner circle of the storage groove 21.

[0071] In the embodiments of the present application, the outer circle of the storage groove 21 can be located within the side edge of the moving plate 20, or the outer circle of the storage groove 21 coincides with the side edge of the moving plate 20.

[0072] In the embodiments of the present application, when the battery 100 is placed on the moving plate 20, the storage groove 21 also surrounds the battery 100, and the pressurizing medium can flow from the periphery of the battery 100 to the storage groove 21. More pressurizing medium flows to the storage groove 21, and the pressurizing medium in contact with the battery 100 is less, and the possibility of contamination of the battery 100 caused by the pressurizing medium is smaller.

[0073] According to some embodiments of the present application, FIG. 5 is a sectional view of an isostatic pressing jig according to some embodiments of the present application. Referring to FIG. 5, for at least one of the plurality of moving plates 20, the side of the moving plate 20 that contacts the battery has a limiting groove 22, and the limiting groove 22 of the plurality of moving plates 20 is located on the same side of the moving plate 20 along the first direction X. The limiting groove 22 and the storage groove 21 are located on opposite sides of the moving plate 20, and the battery is located in the limiting groove 22 when the battery is located in the sealed cavity 30. FIG. 5 only shows part of the moving plates.

[0074] In embodiments of the present application, and for the moving plates 20 with limiting grooves 22, the limiting groove 22 is located on the lower side of the moving plate 20. If the moving plate 20 has both a storage groove 21 and a limiting groove 22, the storage groove 21 and the limiting groove 22 are located on opposite sides of the moving plate 20, respectively.

[0075] In embodiments of the present application, when the battery 100 is located in the sealed cavity 30, the battery 100 is located in the limiting groove 22, which can limit the movement of the battery 100 and improve the stability of the battery 100.

[0076] Exemplarily, the limiting groove 22 can be a cuboid-shaped groove.

[0077] According to some embodiments of the present application, along the first direction X, the depth D of the limiting groove 22 satisfies: 0 < D ≤ 5 mm (millimeters).

[0078] Exemplarily, the depth D of the limiting groove 22 is 3 mm.

[0079] In embodiments of the present application, if the depth D of the limiting groove 22 is set too deep, so that the volume of the limiting groove 22 is too large, the strength of the moving plate 20 will be reduced. Therefore, the depth D of the limiting groove 22 satisfies: 0 < D ≤ 5 mm, which can limit the battery 100 while avoiding the limiting groove 22 affecting the strength of the moving plate 20.

[0080] According to some embodiments of the present application, referring to FIGS. 2-5, the isostatic pressing jig further comprises a sealing ring 50, which is sleeved on the moving plate 20 and located between the inner side wall of the mounting cylinder 10 and the outer side wall of the moving plate 20.

[0081] Exemplarily, the material of the sealing ring 50 can be silicone or rubber.

[0082] In embodiments of the present application, the sealing ring 50 is arranged between the inner side wall of the mounting cylinder 10 and the outer side wall of the moving plate 20, which can improve the sealing performance of the sealed cavity 30 and reduce the possibility of the pressurizing medium entering the sealed cavity 30.

[0083] According to some embodiments of the present application, the surfaces of the installation cylinder 10 and the moving plates 20 are provided with an oil-repellent layer.

[0084] In the process of densifying the battery 100, the pressurizing medium is generally oil.

[0085] In the embodiments of the present application, the oil-repellent layer provided on the surfaces of the installation cylinder 10 and the moving plates 20 can reduce the pollution of the pressurizing medium to the installation cylinder 10 and the moving plates 20, and can also reduce the residue of the pressurizing medium on the surfaces of the installation cylinder 10 and the moving plates 20, thereby reducing the possibility of the pressurizing medium polluting the battery 100.

[0086] According to some embodiments of the present application, the material of the oil-repellent layer includes one of polytetrafluoroethylene and nano-zinc oxide.

[0087] Polytetrafluoroethylene and nano-zinc oxide are relatively common oil-repellent materials, which are inexpensive and have good oil-repellent effect.

[0088] According to some embodiments of the present application, FIG. 6 is a sectional view of an isostatic pressing jig according to some other embodiments of the present application. Referring to FIG. 6, the plurality of moving plates 20 includes a first moving plate 201 located at the end of the plurality of moving plates 20 along the first direction X, and FIG. 7 is a structural schematic view of the first moving plate according to some embodiments of the present application. In combination of FIG. 6 and FIG. 7, the surface of the side of the first moving plate 201 away from the battery is provided with a stress release groove 211.

[0089] In some embodiments of the present application, the plurality of moving plates 20 includes a first moving plate 201 located at the end of the plurality of moving plates 20 along the first direction X.

[0090] In some other embodiments of the present application, the plurality of moving plates 20 includes two first moving plates 201 respectively located at the ends of the plurality of moving plates 20 along the opposite two ends of the first direction X.

[0091] Referring to FIG. 6, when the battery 100 is placed in the sealed cavity 30, a part of the space in the sealed cavity 30 is not occupied by the battery 100, which can be referred to as a first space 200. When the battery 100 is placed in the sealed container filled with the pressurizing medium together with the isostatic pressing tool for densification treatment, for the first moving plate 201, the pressurizing medium exerts a pressure on the first moving plate 201 along the first direction X and towards the inside of the sealed cavity 30, and the first moving plate 201 moves towards the battery 100. When the battery 100 contacts the first moving plate 201, the battery 100 provides a force on the first moving plate 201 along the first direction X and away from the inside of the sealed cavity 30. However, the first space 200 is filled with air, which cannot provide the force. With the increase of the pressure, the first moving plate 201 opposite to the first space 200 bends towards the first space 200, causing the middle part of the first moving plate 201 to be raised, and the middle part of the first moving plate 201 cannot be in close contact with the battery 100 to provide pressure on the battery 100, affecting the effect of the densification treatment.

[0092] In embodiments of the present application, the surface of the first moving plate 201 away from the battery has a stress release groove 211, and the strength of the first moving plate 201 at the stress release groove 211 is reduced. If the first moving plate 201 is bent, it will bend at the stress release groove 211, which can reduce the possibility of the middle part of the first moving plate 201 being raised to a certain extent, thereby reducing the impact on the densification treatment of the battery 100.

[0093] Referring to FIG. 6, the first moving plate 201 is located at the end of the plurality of moving plates 20. Because the moving plates 20 at the end can have a pressure difference, the moving plates 20 in the middle can not have a stress release groove 211 because the ends of the moving plates 20 in the middle are both air and do not have a pressure difference.

[0094] Exemplarily, the bottom surface of the stress release groove 211 can be a circular arc surface or a flat surface.

[0095] According to some embodiments of the present application, when the battery is located in the sealed cavity 30, the projection of the stress release groove 211 on the first plane is close to the edge of the projection of the battery on the first plane, and the first plane is perpendicular to the first direction X.

[0096] In embodiments of the present application, the projection of the stress release groove 211 on the first plane is close to the edge of the projection of the battery on the first plane, and the projection of the stress release groove 211 on the first plane is at least partially located in the projection of the battery on the first plane.

[0097] In the embodiments of the present application, the stress release groove 211 is arranged near the edge of the battery. If the first moving plate 201 is bent, it will be bent from the edge of the battery, and the influence on the middle part of the battery 100 is small, and the influence on the densification treatment of the middle part of the battery 100 is reduced.

[0098] According to some embodiments of the present application, the shape of the stress release groove 211 is annular, the orthographic projection of the stress release groove 211 on the first plane surrounds the edge of the orthographic projection of the battery on the first plane, and the inner circle of the stress release groove 211 is located in the orthographic projection of the battery on the first plane.

[0099] In the embodiments of the present application, the stress release groove 211 can be a rectangular annular groove.

[0100] In some embodiments of the present application, the outer circle of the stress release groove 211 is located in the orthographic projection of the battery on the first plane, that is, the orthographic projection of the entire stress release groove 211 on the first plane is located in the orthographic projection of the battery on the first plane.

[0101] Since the Overhang is located at the edge of the battery, the stress release groove 211 can correspond to the Overhang, and the Overhang does not need to form an ion channel and can not be subjected to the densification treatment.

[0102] In the embodiments of the present application, if the inner circle of the stress release groove 211 is located outside the orthographic projection of the battery on the first plane, the part between the inner circle of the stress release groove 211 and the edge of the battery will also be bent due to the unbalanced pressure from above and below, so that the middle part of the first moving plate 201 is raised.

[0103] In the embodiments of the present application, since the inner circle of the stress release groove 211 is located in the orthographic projection of the battery on the first plane, the part of the first moving plate 201 surrounded by the inner circle of the stress release groove 211 is in contact with the battery 100, and the pressure difference of this part of the first moving plate 201 is small, and generally little deformation occurs. The part of the first moving plate 201 outside the outer circle of the stress release groove 211 has a large pressure difference, and the first moving plate 201 will generally be bent from the stress release groove 211, that is, the first moving plate 201 is bent in the first direction X into the sealing cavity 30 around, since the stress release groove 211 surrounds the edge of the battery, the influence on the middle part of the battery 100 is small, and the stress release groove 211 corresponds to the Overhang of the battery, and does not have a great influence on the densification of the edge part of the battery, while ensuring the densification effect of the middle part of the battery.

[0104] In the embodiments of the present application, referring to FIG. 6, the four sides of the first moving plate 201 are bent inwardly along the first direction X into the sealed cavity 30, so that the four sides of the first moving plate 201 are more closely connected with the side wall of the mounting cylinder 10, and the sealing performance of the sealed cavity 30 is improved.

[0105] According to some embodiments of the present application, the outer circle of the stress release groove 211 is located outside the projection of the battery on the first plane.

[0106] That is, part of the projection of the stress release groove 211 on the first plane is located inside the projection of the battery on the first plane, and part of the projection of the stress release groove 211 on the first plane is located outside the projection of the battery on the first plane. The inner circle of the stress release groove 211 can correspond to the Overhang.

[0107] In the embodiments of the present application, the outer circle of the stress release groove 211 is located outside the projection of the battery on the first plane, and the stress release groove 211 has less overlap with the edge of the battery, which can more greatly reduce the influence of the bending of the first moving plate 201 from the stress release groove 211 on the densification of the edge portion of the battery.

[0108] The embodiments of the present application also provide an isostatic pressing device, which comprises the isostatic pressing jig of any one of the above-mentioned embodiments, and the isostatic pressing jig is used for clamping a battery.

[0109] The embodiments of the present application provide an isostatic pressing jig, which is configured to be used for clamping a battery, and the isostatic pressing jig comprises a mounting cylinder 10, a plurality of moving plates 20, a sealing member 40 and a sealing ring 50. The mounting cylinder 10 has a mounting cavity 11 extending along a first direction X, and the mounting cavity 11 has two openings. The plurality of moving plates 20 are arranged along the first direction X, and the moving plates 20 are movably located in the mounting cavity 11. The adjacent moving plates 20 and the inner side wall of the mounting cylinder 10 form a sealed cavity 30, and the battery 100 is located in the sealed cavity 30. The moving direction of the moving plates 20 is the first direction X. The sealing ring 50 is sleeved on the moving plates 20, and the sealing ring 50 is located between the inner side wall of the mounting cylinder 10 and the outer side wall of the moving plates 20.

[0110] The mounting cylinder 10 has a gas permeable hole 12, the gas permeable hole 12 communicates with the mounting cavity 11, and the sealing member 40 is located in the gas permeable hole 12. The sealing member 40 is configured to block the gas permeable hole 12. The sealing member 40 comprises a bidirectional exhaust valve.

[0111] For at least one of the plurality of moving plates 20, the plate surface of the side of the moving plate 20 in contact with the battery has a storage groove 21, and along the first direction X, the storage groove 21 of the plurality of moving plates 20 is located on the same side of the plate surface of the moving plate 20 where the storage groove 21 is located. The shape of the storage groove 21 is annular, and the storage groove 21 surrounds the edge of the moving plate 20.

[0112] For at least one of the plurality of moving plates 20, the plate surface of the side of the moving plate 20 in contact with the battery has a limiting groove 22, and along the first direction X, the limiting groove 22 of the plurality of moving plates 20 is located on the same side of the plate surface of the moving plate 20 where the limiting groove 22 is located. The limiting groove 22 and the storage groove 21 are located on opposite plate surfaces of the moving plate 20, and the battery is located in the limiting groove 22 when the battery is located in the sealed cavity 30. Along the first direction X, the depth D of the limiting groove 22 satisfies: 0 < D ≤ 5 mm.

[0113] The surface of the mounting cylinder 10 and the moving plate 20 has an oleophobic layer. The material of the oleophobic layer includes one of polytetrafluoroethylene and nano zinc oxide.

[0114] The plurality of moving plates 20 includes two first moving plates 201, and the two first moving plates 201 are respectively located at the ends of the plurality of moving plates 20 along the opposite two ends in the first direction X. The plate surface of the side of the first moving plate 201 away from the battery has a stress release groove 211. The shape of the stress release groove 211 is annular, and when the battery is located in the sealed cavity 30, the stress release groove 211 surrounds the edge of the battery in the first plane. The inner circle of the stress release groove 211 is located within the projection of the battery in the first plane. The outer circle of the stress release groove 211 is located outside the projection of the battery in the first plane, and the first plane is perpendicular to the first direction X.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some or all of the technical features. Such modifications or replacements do not change the essence of the corresponding technical solutions, and they should be covered in the scope of the claims and the description of the present application. In particular, each technical feature mentioned in the embodiments can be combined in any way without structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An isostatic pressing tool configured to clamp a battery, the isostatic pressing tool comprising: a mounting cylinder (10) having a mounting cavity (11) extending in a first direction, the mounting cavity (11) having at least one opening; a plurality of moving plates (20) arranged in the first direction, the moving plates (20) being movably located in the mounting cavity (11), adjacent moving plates (20) and an inner side wall of the mounting cylinder (10) forming a sealed cavity (30) in which the battery is located, a moving direction of the moving plates (20) being the first direction.

2. The isostatic press tool of claim 1, wherein, the mounting cylinder (10) having a gas permeable hole (12) in communication with the mounting cavity (11), the isostatic pressing tool further comprising: a sealing member (40) located in the gas permeable hole (12), the sealing member (40) being configured to block the gas permeable hole (12).

3. The isostatic press tool of claim 2, wherein, the sealing member (40) comprising a bidirectional exhaust valve.

4. The isostatic press tool of any one of claims 1 to 3, wherein, for at least one moving plate (20) of the plurality of moving plates (20), a plate surface of a side of the moving plate (20) in contact with the battery has a storage groove (21), along the first direction, storage grooves (21) of the plurality of moving plates (20) are located on the same side of the plate surface of the moving plate (20) in which the storage grooves (21) are located.

5. The isostatic press tool of claim 4, wherein, the storage groove (21) has a shape of a ring, the storage groove (21) surrounds an edge of the moving plate (20).

6. The isostatic press tool of claim 4 or 5, wherein, for at least one moving plate (20) of the plurality of moving plates (20), a plate surface of a side of the moving plate (20) in contact with the battery has a limiting groove (22), along the first direction, limiting grooves (22) of the plurality of moving plates (20) are located on the same side of the plate surface of the moving plate (20) in which the limiting grooves (22) are located, the limiting groove (22) and the storage groove (21) are located on opposite plate surfaces of the moving plate (20); in a case where the battery is located in the sealed cavity (30), the battery is located in the limiting groove (22).

7. The isostatic press tool of claim 6, wherein, along the first direction, a depth D of the limiting groove (22) satisfies: 0 < D ≤ 5 mm.

8. The isostatic press tool of any one of claims 1 to 7, wherein, the isostatic pressing tool comprising: a sealing ring (50) sleeved on the moving plate (20), the sealing ring (50) being located between an inner side wall of the mounting cylinder (10) and an outer side wall of the moving plate (20).

9. The isostatic press tool of any one of claims 1 to 8, wherein, surfaces of the mounting cylinder (10) and the moving plate (20) have an oleophobic layer.

10. The isostatic press tool of claim 9, wherein, a material of the oleophobic layer comprises one of polytetrafluoroethylene and nano-zinc oxide.

11. The isostatic press tool of any one of claims 1 to 10, wherein, the plurality of moving plates (20) comprises a first moving plate (201) located at an end of at least one end of the plurality of moving plates (20) in the first direction, a plate surface of a side of the first moving plate (201) away from the battery has a stress release groove (211).

12. The isostatic press tool of claim 11, wherein, In a case where the battery is located in the sealed cavity (30), a normal projection of the stress release groove (211) on a first plane is close to an edge of a normal projection of the battery on the first plane, the first plane being perpendicular to the first direction.

13. The isostatic press tool of claim 12, wherein, The stress release groove (211) is annular in shape, a normal projection of the stress release groove (211) on the first plane surrounds an edge of a normal projection of the battery on the first plane, and an inner circle of the stress release groove (211) is located within the normal projection of the battery on the first plane.

14. The isostatic press tool of claim 13, wherein, An outer circle of the stress release groove (211) is located outside the normal projection of the battery on the first plane.

15. An isostatic pressing device, comprising the isostatic pressing jig according to any one of claims 1 to 14, the isostatic pressing jig being used for clamping a battery.

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