Isostatic pressing jig, isostatic pressing device and battery production equipment

Abstract

The utility model provides an isostatic pressing jig, an isostatic pressing device and battery production equipment, and belongs to the technical field of batteries. The isostatic pressing jig comprises a clamping assembly and a clamp assembly. The clamping assembly is configured to be used for clamping the electrode assembly, at least part of the clamp assembly is located on the two opposite sides of the clamping assembly in the first direction, and the clamp assembly is configured to be used for applying pressure to the clamping assembly in the first direction so that the clamping assembly can apply pressure to the electrode assembly. Due to the fact that the clamping assembly clamps the isostatic pressing film on the surface of the electrode assembly, the clamping assembly can reduce transmission of deformation of the isostatic pressing film to the electrode assembly, the influence of deformation of a packaging film on the electrode assembly is reduced, the stability of the electrode assembly is improved, and the densification effect of the electrode assembly is better. And meanwhile, the clamp assembly provides pressure for the clamping assembly, so that the clamping assembly provides pre-tightening force for the electrode assembly, movement of the electrode assembly is reduced, the stability of the electrode assembly is improved, and the production yield of the solid-state battery is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are 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 advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] Solid-state batteries are batteries that use solid electrodes and solid electrolytes. Solid-state batteries have high energy density, higher safety and stability, and have good development prospects in the battery field.

[0004] In the related art, during the isostatic pressing process of the electrode assembly of the solid-state battery, the electrode assembly is easily deformed, causing damage to the electrode assembly, thereby reducing the production yield of the solid-state battery. Utility Model Content

[0005] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one purpose of the present application is to provide an isostatic pressing jig, an isostatic pressing device and a battery production equipment to improve the production yield of solid-state batteries.

[0006] An embodiment of the first aspect of the present application provides an isostatic pressing jig, which is configured to clamp an electrode assembly. The isostatic pressing jig includes: a clamping assembly, which is configured to clamp the electrode assembly; a clamping assembly, which is at least partially located on opposite sides of the clamping assembly along a first direction, and the clamping assembly is configured to apply pressure to the clamping assembly along the first direction so that the clamping assembly applies pressure to the electrode assembly.

[0007] In the technical solution of the embodiment of the present application, a clamping assembly is used to clamp the electrode assembly, and then a clamping assembly is used to apply pressure to the clamping assembly along a first direction; then the isostatic pressing jig and the electrode assembly are placed together in an isostatic pressing container to perform isostatic pressing on the electrode assembly. Since the clamping assembly clamps the isostatic pressing film on the surface of the electrode assembly, the clamping assembly can reduce the deformation of the isostatic pressing film and transmit it to the electrode assembly, reduce the influence of the deformation of the packaging film on the electrode assembly, improve the stability of the electrode assembly, and achieve a better densification effect of the electrode assembly. At the same time, the clamping assembly provides pressure to the clamping assembly, so that the clamping assembly provides a pre-tightening force to the electrode assembly, reduces the movement of the electrode assembly, improves the stability of the electrode assembly, and improves the production yield of the solid-state battery.

[0008] In some embodiments, the clamp assembly includes: a first clamp plate, located on one side of the clamp assembly along the first direction; a second clamp plate, located on the other side of the clamp assembly along the first direction; a connecting plate, located between the first clamp plate and the second clamp plate, the connecting plate connecting the second clamp plate and the first clamp plate; a sliding member, the sliding member passes through the first clamp plate and abuts against the clamp assembly, and the sliding member is slidably connected to the first clamp plate. The clamp assembly is placed between the first clamp plate and the second clamp plate, and the sliding member is controlled to contact the clamp assembly, and then the sliding member is controlled to slide toward the clamp assembly along the first direction, and the sliding member squeezes the clamp assembly so that the clamp assembly applies pressure to the electrode assembly.

[0009] In some embodiments, the first fixture plate has a threaded hole extending in the first direction, and the sliding member is threadedly connected to the threaded hole. The sliding member is threadedly connected to the threaded hole on the first fixture plate, and the sliding member can be controlled to slide in the first direction by screwing the sliding member, which is more convenient to control the movement of the sliding member.

[0010] In some embodiments, the first fixture plate has a connecting protrusion, and the threaded hole penetrates the connecting protrusion. Providing the connecting protrusion and the threaded hole penetrating the connecting protrusion can increase the length of the threaded hole, that is, increase the length of the connection between the first fixture plate and the sliding member, so that the connection between the first fixture plate and the sliding member is more stable.

[0011] In some embodiments, the plate surface of the second fixture plate is perpendicular to the first direction, and the first fixture plate includes: a first straight plate, the plate surface of the first straight plate is perpendicular to the first direction, and the sliding member is connected to the first straight plate; a second straight plate, the plate surface of the second straight plate is perpendicular to the first direction, and the second straight plate is connected to the connecting plate; an inclined plate, located between the first straight plate and the second straight plate, the plate surface of the inclined plate intersects with the first direction, and the inclined plate connects the first straight plate and the second straight plate; wherein, along the first direction, the distance D1 between the first straight plate and the second fixture plate is greater than the distance D2 between the second straight plate and the second fixture plate. The cavity in the isostatic pressure container is spherical or ellipsoidal, and the space of the part of the cavity close to the edge is small. Since the distance D1 between the first straight plate and the second fixture plate is greater than the distance D2 between the second straight plate and the second fixture plate, and the second straight plate is located at the edge area of ​​the entire isostatic pressing jig, when the isostatic pressing jig is placed in the cavity, part of the second straight plate can be close to the edge of the cavity, which is convenient for placing the isostatic pressing jig and the electrode assembly.

[0012] In some embodiments, the clamping assembly includes: at least two clamping plates, at least two clamping plates are stacked along a first direction, the first direction intersects with the surface of the clamping plates, and the electrode assembly is located between any two adjacent clamping plates. The electrode assembly is pressurized by the clamping plates, and the structure of the clamping assembly is relatively simple, which can simplify the structure of the clamping assembly. At the same time, in the subsequent isostatic pressing process, the clamping plates mainly apply pressure to the middle part of the electrode assembly, and the pressure of the clamping plates on the edges and tabs of the electrode assembly is smaller, which can reduce the possibility of damage to the anode pole piece and the tab, and reduce the possibility of damage to the electrode assembly.

[0013] In some embodiments, the at least two clamping plates include a first clamping plate, the first clamping plate is located at the end of one of the at least two clamping plates along the first direction, the plate surface of the first clamping plate in contact with the clamp assembly has a reinforcing protrusion, and the clamp assembly is configured to apply pressure to the reinforcing protrusion along the first direction. The reinforcing protrusion can increase the strength of the first clamping plate and reduce the possibility of the first clamping plate being crushed by the clamp assembly.

[0014] In some embodiments, the plate surface of the first clamping plate in contact with the clamp assembly has two reinforcing protrusions, and the extension directions of the two reinforcing protrusions intersect. The two reinforcing protrusions are provided, and the extension directions of the two reinforcing protrusions intersect, so that the reinforcing protrusions on the first clamping plate are more evenly distributed, and the pressure of the clamp assembly on the reinforcing protrusions can be more evenly transmitted to the first clamping plate through the reinforcing protrusions, so that the first clamping plate can transmit pressure to the electrode assembly more evenly, thereby improving the densification effect on the electrode assembly.

[0015] In some embodiments, along the first direction, the maximum thickness L1 of the first clamping plate and the thickness L2 of the reinforcing protrusion satisfy: 1.5≤L1 / L2≤3. By setting L1 / L2 within the above range, the strength of the first clamping plate can be improved without affecting the overall miniaturization design of the isostatic pressing jig.

[0016] In some embodiments, the maximum thickness L1 of the first clamping plate is greater than or equal to 6 mm and less than or equal to 10 mm. By setting the maximum thickness L1 of the first clamping plate within the above range, the influence of the excessive thickness of the first clamping plate on the overall miniaturization design of the isostatic pressing jig can be reduced without reducing the strength of the first clamping plate.

[0017] In some embodiments, the plate surface of the clamping plate in contact with the clamp assembly has two limiting protrusions, the two limiting protrusions are arranged at intervals, and the portion of the clamp assembly in contact with the clamping plate is located between the two limiting protrusions. The plate surface of the clamping plate in contact with the clamp assembly has two limiting protrusions, and the portion of the clamp assembly in contact with the clamping plate is located between the two limiting protrusions, which can limit the position of the clamp assembly, reduce the possibility of movement of the clamp assembly, improve the stability of the isostatic pressing jig and the electrode assembly during the isostatic pressing process, and improve the densification effect on the electrode assembly.

[0018] In some embodiments, the material of the clamping plate includes one of aluminum and steel. Aluminum and steel are relatively common materials, cheap, and can reduce the production cost of the isostatic pressing jig. At the same time, aluminum and steel are strong, which can improve the strength of the clamping plate.

[0019] An embodiment of the second aspect of the present application provides an isostatic pressing device, which includes the isostatic pressing jig in the above embodiment.

[0020] An embodiment of the third aspect of the present application provides a battery production device, which includes the isostatic pressing device in the above embodiment, and the isostatic pressing device is used to perform isostatic pressing treatment on the electrode assembly.

[0021] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 A schematic diagram of the structure of an isostatic pressing jig provided in an embodiment of the present application;

[0024] Figure 2 A front view of an isostatic pressing jig provided in an embodiment of the present application;

[0025] Figure 3 An exploded view of an isostatic pressing jig provided in an embodiment of the present application;

[0026] Figure 4 A front view of an exploded view of an isostatic pressing jig provided in an embodiment of the present application;

[0027] Figure 5An exploded view of a clamp assembly provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of a first clamping plate provided in an embodiment of the present application;

[0029] Figure 7 A schematic structural diagram of a clamping plate provided in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 100, electrode assembly; 10, clamping assembly; 11, clamping plate; 111, first clamping plate; 112, reinforcing protrusion; 113, limiting protrusion; 20, clamp assembly; 21, first clamp plate; 211, connecting protrusion; 212, first straight plate; 213, second straight plate; 214, inclined plate; 215, threaded hole; 22, second clamp plate; 23, connecting plate; 24, sliding member. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0035] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0037] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power 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 electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0041] Solid-state batteries transmit lithium ions through solid electrolytes to form current between positive and negative electrodes. Isostatic pressing can ensure the ion channel at the solid-solid interface and is an important procedure in the preparation of solid-state batteries. The electrode assembly of the solid-state battery is placed in a closed container filled with a pressurized medium, and the booster system is used to apply equal pressure to the electrode assembly, thereby reducing the distance between molecules and increasing the density without changing the appearance, thereby improving the physical properties of the electrode assembly and achieving densification of the electrode assembly.

[0042] During the isostatic pressing process, the electrode assembly is subjected to relatively high pressure, and the electrode assembly is easily damaged during the isostatic pressing process.

[0043] An embodiment of the present application provides an isostatic pressing jig, which includes a clamping assembly and a clamping assembly. The clamping assembly is configured to clamp the electrode assembly, at least part of the clamping assembly is located on opposite sides of the clamping assembly along a first direction, and the clamping assembly is configured to apply pressure to the clamping assembly along the first direction so that the clamping assembly applies pressure to the electrode assembly. Since the clamping assembly clamps the isostatic pressing film on the surface of the electrode assembly, the clamping assembly can reduce the deformation of the isostatic pressing film from being transmitted to the electrode assembly, reduce the influence of the deformation of the packaging film on the electrode assembly, improve the stability of the electrode assembly, and achieve a better densification effect of the electrode assembly. At the same time, the clamping assembly provides pressure to the clamping assembly, so that the clamping assembly provides a pre-tightening force to the electrode assembly, reduces the movement of the electrode assembly, and improves the stability of the electrode assembly.

[0044] The solid-state battery and electrode assembly produced by the isostatic pressing jig disclosed in the embodiments of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft.

[0045] The embodiment of the present application provides an isostatic pressing jig, Figure 1 A schematic diagram of the structure of an isostatic pressing jig provided in an embodiment of the present application. Figure 2 This is a front view of an isostatic pressing jig provided in an embodiment of the present application. Figure 1 and Figure 2 The isostatic pressing jig is configured to clamp the electrode assembly 100, and the isostatic pressing jig includes a clamping assembly 10 and a clamping assembly 20. The clamping assembly 10 is configured to clamp the electrode assembly 100, at least part of the clamping assembly 20 is located on opposite sides of the clamping assembly 10 along the first direction X, and the clamping assembly 20 is configured to apply pressure to the clamping assembly 10 along the first direction X, so that the clamping assembly 10 applies pressure to the electrode assembly 100.

[0046] During the isostatic pressing process, the isostatic pressing jig clamps the electrode assembly 100, and the isostatic pressing jig and the electrode assembly 100 are placed together in an isostatic pressing container, and the pressurized medium in the isostatic pressing container contacts the electrode assembly 100. In the embodiment of the present application, the surface of the electrode assembly 100 is coated with a layer of isostatic pressing film, which is used to isolate the electrode assembly 100 from the pressurized medium, thereby reducing the possibility of the electrode assembly 100 being contaminated by the pressurized medium.

[0047] Exemplarily, the isostatically pressed film may be one of an aluminum-plastic film, a polyethylene film, and a polypropylene film.

[0048] In the embodiment of the present application, the clamping assembly 10 clamps the electrode assembly 100 . During the isostatic pressing process, the clamping assembly 10 applies pressure to the electrode assembly 100 to achieve densification of the electrode assembly 100 .

[0049] In the embodiment of the present application, when the electrode assembly 100 is a rectangular parallelepiped, the first direction X can be understood as the thickness direction of the electrode assembly 100 .

[0050] In an embodiment of the present application, the electrode assembly 100 is clamped by a clamping assembly 10, and then a clamping assembly 20 is used to apply pressure to the clamping assembly 10 along a first direction X; then the isostatic pressing jig and the electrode assembly 100 are placed together in an isostatic pressing container to perform isostatic pressing on the electrode assembly 100. Since the clamping assembly 10 clamps the isostatic pressing film on the surface of the electrode assembly 100, the clamping assembly 10 can reduce the deformation of the isostatic pressing film from being transmitted to the electrode assembly 100, reduce the influence of the deformation of the packaging film on the electrode assembly 100, improve the stability of the electrode assembly, and achieve a better densification effect of the electrode assembly 100. At the same time, the clamping assembly 20 provides pressure to the clamping assembly 10, so that the clamping assembly 10 provides a pre-tightening force to the electrode assembly 100, reduces the movement of the electrode assembly 100, improves the stability of the electrode assembly 100, and improves the production yield of the solid-state battery.

[0051] According to some embodiments of the present application, Figure 3 An exploded view of an isostatic pressing fixture provided in an embodiment of the present application. Figure 4 This is a front view of an exploded view of an isostatic pressing fixture provided in an embodiment of the present application. Figure 5 This is an exploded view of a clamp assembly provided in an embodiment of the present application. Figures 3 to 5The clamp assembly 20 includes a first clamp plate 21, a second clamp plate 22, a connecting plate 23 and a sliding member 24. The first clamp plate 21 is located at one side of the clamp assembly 10 along the first direction X, the second clamp plate 22 is located at the other side of the clamp assembly 10 along the first direction X, the connecting plate 23 is located between the first clamp plate 21 and the second clamp plate 22, the connecting plate 23 connects the second clamp plate 22 and the first clamp plate 21, the sliding member 24 penetrates the first clamp plate 21 and abuts against the clamp assembly 10, and the sliding member 24 is slidably connected to the first clamp plate 21.

[0052] In the embodiment of the present application, the first clamping plate 21 and the second clamping plate 22 are respectively located at opposite sides of the clamping assembly 10 along the first direction X, and the clamping assembly 10 is located between the first clamping plate 21 and the second clamping plate 22 .

[0053] In an embodiment of the present application, the first fixture plate 21, the second fixture plate 22 and the connecting plate 23 can be manufactured in an integrated manner; or the first fixture plate 21, the second fixture plate 22 and the connecting plate 23 can be manufactured separately and then connected together.

[0054] Exemplarily, the materials of the first fixture plate 21 , the second fixture plate 22 and the connecting plate 23 may be metal or plastic.

[0055] In an embodiment of the present application, the sliding direction of the sliding member 24 is the first direction X. Since the sliding member 24 passes through the first clamp plate 21 and abuts against the clamping assembly 10, in the process of the sliding member 24 sliding toward the clamping assembly 10, the sliding member 24 abuts against the clamping assembly 10, and the sliding member 24 applies pressure to the clamping assembly 10.

[0056] In an embodiment of the present application, the clamping assembly 10 is placed between the first clamping plate 21 and the second clamping plate 22, and the sliding member 24 is controlled to contact the clamping assembly 10, and then the sliding member 24 is controlled to slide along the first direction X toward the clamping assembly 10, and the sliding member 24 squeezes the clamping assembly 10 so that the clamping assembly 10 applies pressure to the electrode assembly 100.

[0057] According to some embodiments of the present application, the first fixture plate 21 has a threaded hole 215 extending along the first direction X, and the sliding member 24 is threadedly connected to the threaded hole 215 .

[0058] For example, the sliding member 24 may be a bolt; or the sliding member 24 may be a member having an external screw-shaped member.

[0059] In an embodiment of the present application, the sliding member 24 is threadedly connected to the threaded hole 215 on the first fixture plate 21, and the sliding member 24 can be controlled to slide along the first direction X by screwing the sliding member 24, which is more convenient to control the movement of the sliding member 24.

[0060] According to some embodiments of the present application, the first fixture plate 21 has a connecting protrusion 211 , and the threaded hole 215 passes through the connecting protrusion 211 .

[0061] Exemplarily, the shape of the connection protrusion 211 may be cylindrical or rectangular.

[0062] In some embodiments of the present application, the first clamp plate 21 has a connecting protrusion 211 on a side away from the clamping assembly 10; in other embodiments of the present application, the first clamp plate 21 has a connecting protrusion 211 on a side facing the clamping assembly 10; in other embodiments of the present application, the first clamp plate 21 has a connecting protrusion 211 on both opposite sides arranged along the first direction X.

[0063] In an embodiment of the present application, a connecting protrusion 211 is provided, and a threaded hole 215 passes through the connecting protrusion 211, which can increase the length of the threaded hole 215, that is, increase the length of the connection between the first clamp plate 21 and the sliding member 24, and make the connection between the first clamp plate 21 and the sliding member 24 more stable.

[0064] According to some embodiments of the present application, see Figure 4 and Figure 5 , the plate surface of the second fixture plate 22 is perpendicular to the first direction X, and the first fixture plate 21 includes a first straight plate 212, a second straight plate 213 and an inclined plate 214. The plate surface of the first straight plate 212 is perpendicular to the first direction X, the sliding member 24 is connected to the first straight plate 212, the plate surface of the second straight plate 213 is perpendicular to the first direction X, the second straight plate 213 is connected to the connecting plate 23, the inclined plate 214 is located between the first straight plate 212 and the second straight plate 213, the plate surface of the inclined plate 214 intersects with the first direction X, and the inclined plate 214 connects the first straight plate 212 and the second straight plate 213. Wherein, see Figure 4 Along the first direction X, a distance D1 between the first straight plate 212 and the second fixture plate 22 is greater than a distance D2 between the second straight plate 213 and the second fixture plate 22 .

[0065] In the embodiment of the present application, the first straight plate 212, the second straight plate 213 and the inclined plate 214 can be manufactured by integral molding; or the first straight plate 212, the second straight plate 213 and the inclined plate 214 can be manufactured separately and then connected together.

[0066] In the embodiment of the present application, the distance D2 between the second clamp plates 22 is greater than the total thickness of the clamping assembly 10 after clamping the electrode assembly 100 .

[0067] In the embodiment of the present application, the connecting protrusion 211 and the threaded hole 215 are both located on the first straight plate 212 .

[0068] In some embodiments, the cavity in the isostatic pressing container is spherical or ellipsoidal, and the space near the edge of the cavity is smaller. Since the distance D1 between the first straight plate 212 and the second clamp plate 22 is greater than the distance D2 between the second straight plate 213 and the second clamp plate 22, and the second straight plate 213 is located at the edge area of ​​the entire isostatic pressing jig, when the isostatic pressing jig is placed in the cavity, part of the second straight plate 213 can be close to the edge of the cavity, which is convenient for placing the isostatic pressing jig and the electrode assembly 100.

[0069] In the drawings of the embodiments of the present application, the sliding member 24 is only placed on one side of the first clamp plate 21 along the first direction X, and the sliding member 24 is not connected to the first clamp plate 21. When the sliding member 24 is connected to the first clamp plate 21 and the sliding member 24 is against the clamping assembly 10, only a small part of the sliding member 24 protrudes from the first clamp plate 21, and will not have a significant impact on the thickness of the entire isostatic pressing fixture.

[0070] In some other embodiments of the present application, a shorter sliding member 24 can also be selected so that the sliding member 24 can pass through the first clamp plate 21 and abut against the clamping assembly 10. At the same time, the thickness of the sliding member 24 protruding from the first clamp plate 21 is smaller, thereby reducing the impact on the thickness of the entire isostatic pressing fixture.

[0071] According to some embodiments of the present application, see Figure 3 and Figure 4 The clamping assembly 10 includes at least two clamping plates 11 , and the at least two clamping plates 11 are stacked along a first direction X, the first direction X intersects with the surface of the clamping plates 11 , and the electrode assembly 100 is located between any two adjacent clamping plates 11 .

[0072] In some embodiments of the present application, the clamping assembly 10 may include two clamping plates 11 , and the electrode assembly 100 is located between the two clamping plates 11 .

[0073] In other implementations, the clamping assembly 10 may include a greater number of clamping plates 11 , and the electrode assembly 100 is located between any two adjacent clamping plates 11 , that is, one clamping assembly 10 may clamp a plurality of electrode assemblies 100 .

[0074] In the embodiment of the present application, the first direction X is perpendicular to the surface of the clamping plate 11. Alternatively, the first direction X has a component perpendicular to the surface of the clamping plate 11, for example, the angle between the first direction X and the surface of the clamping plate 11 is between 80° and 90°.

[0075] In the embodiment of the present application, the clamp assembly 20 applies pressure to the clamping plates 11 along the first direction X, so that any two adjacent clamping plates 11 are close to each other, and the clamping plates 11 provide a pre-tightening force to the electrode assembly 100. During the isostatic pressing process, the pressurized medium pushes the clamping plates 11 close to each other, so that the clamping plates 11 apply pressure to the electrode assembly 100, thereby achieving a densification process for the electrode assembly.

[0076] In some embodiments of the present application, the clamping plate 11 is generally a rectangular plate. In other implementations, the clamping plate 11 may also be a plate-like structure of other shapes, such as a circular plate.

[0077] In the related art, the electrode assembly coated with the isostatic film is generally placed directly in the cavity of the isostatic pressure container for isostatic pressing. In the electrode assembly of the related art, the anode electrode plate exceeds the cathode electrode plate in both its width and length directions, so as to avoid excessive lithium ions released from the active material of the cathode electrode plate during charging to a certain extent, and unable to be fully inserted into the active material of the anode electrode plate, thereby causing lithium precipitation on the surface of the anode electrode plate, posing a safety risk. The area where the anode electrode plate exceeds the cathode electrode plate in its width and length directions is called Overhang. In the process of densification of the electrode assembly, the anode electrode plate at the ear and the Overhang is easily broken, causing damage to the electrode assembly.

[0078] In the isostatic pressing jig provided in the embodiment of the present application, the electrode assembly 100 is pressurized by the clamping plate 11, and the structure of the clamping assembly 10 is relatively simple, which can simplify the structure of the clamping assembly 10. At the same time, in the subsequent isostatic pressing process, the clamping plate 11 mainly applies pressure to the middle part of the electrode assembly 100, and the pressure of the clamping plate 11 on the edge and the pole ear of the electrode assembly is smaller, which can reduce the possibility of damage to the anode pole sheet and the pole ear, and reduce the possibility of damage to the electrode assembly 100.

[0079] In the embodiment of the present application, the clamping plate 11 contacts the entire large surface of the electrode assembly 100 , and the pressure transmitted by the clamping plate 11 to the electrode assembly 100 is more uniform, which can improve the flatness of the electrode assembly 100 .

[0080] According to some embodiments of the present application, see Figure 3 and Figure 4 The at least two clamping plates 11 include a first clamping plate 111 , and the first clamping plate 111 is located at an end portion of one end of the at least two clamping plates 11 along the first direction X. Figure 6 This is a schematic diagram of the structure of a first clamping plate provided in an embodiment of the present application. Figure 3 and Figure 6The plate surface of the first clamping plate 111 that contacts the clamp assembly 20 has a reinforcing protrusion 112 , and the clamp assembly 20 is configured to apply pressure along the first direction X to the reinforcing protrusion 112 .

[0081] In an embodiment of the present application, when the clamp assembly 20 includes a sliding member 24, the first clamping plate 111 is located at the end of one end of at least two clamping plates 11 close to the sliding member 24, at least a portion of the reinforcing protrusion 112 is opposite to the sliding member 24, and the sliding member 24 applies pressure to the reinforcing protrusion 112.

[0082] In the embodiment of the present application, the reinforcing protrusion 112 can increase the strength of the first clamping plate 111 and reduce the possibility of the first clamping plate 111 being crushed by the clamp assembly 20 .

[0083] According to some embodiments of the present application, see Figure 3 and Figure 6 The plate surface of the first clamping plate 111 that contacts the clamp assembly 20 has two reinforcing protrusions 112 , and the extension directions of the two reinforcing protrusions 112 intersect.

[0084] In some embodiments of the present application, see Figure 6 The two reinforcing protrusions 112 are distributed in a "cross" shape, that is, the extension directions of the two reinforcing protrusions 112 are perpendicular.

[0085] Exemplarily, the length of one of the two reinforcing protrusions 112 is equal to the length of the first clamping plate 111 , and the length of the other of the two reinforcing protrusions 112 is equal to the width of the first clamping plate 111 .

[0086] In other embodiments of the present application, the extension directions of the two reinforcing protrusions 112 may intersect but not be perpendicular.

[0087] In an embodiment of the present application, two reinforcing protrusions 112 are provided, and the extension directions of the two reinforcing protrusions 112 intersect, so that the reinforcing protrusions 112 on the first clamping plate 111 are more uniformly distributed, and the pressure of the clamping assembly 20 on the reinforcing protrusions 112 can be more evenly transmitted to the first clamping plate 111 through the reinforcing protrusions 112, so that the first clamping plate 111 can transmit pressure to the electrode assembly 100 more evenly, thereby improving the densification effect on the electrode assembly 100.

[0088] According to some embodiments of the present application, see Figure 4 , along the first direction X, the maximum thickness L1 of the first clamping plate 111 and the thickness L2 of the reinforcing protrusion 112 satisfy: 1.5≤L1 / L2≤3.

[0089] Exemplarily, L1 / L2=2.

[0090] If the value of L1 / L2 is too small, the thickness L2 of the reinforcing protrusion 112 will be too large, which will increase the overall thickness of the first clamping plate 111 and affect the overall miniaturization design of the isostatic pressing fixture; if the value of L1 / L2 is too small, the thickness L2 of the reinforcing protrusion 112 will be too small, which will not be able to effectively improve the strength of the first clamping plate 111.

[0091] In the embodiment of the present application, by setting L1 / L2 within the above range, the strength of the first clamping plate 111 can be improved without affecting the overall miniaturization design of the isostatic pressing jig.

[0092] According to some embodiments of the present application, the maximum thickness L1 of the first clamping plate 111 is greater than or equal to 6 millimeters (mm) and less than or equal to 10 mm.

[0093] Exemplarily, the maximum thickness L1 of the first clamping plate 111 is equal to 8 mm.

[0094] In an embodiment of the present application, the maximum thickness L1 of the first clamping plate 111 is set within the above range, which can reduce the impact of the excessive thickness of the first clamping plate 111 on the overall miniaturization design of the isostatic pressing fixture without reducing the strength of the first clamping plate 111.

[0095] According to some embodiments of the present application, Figure 7 This is a schematic diagram of the structure of a clamping plate provided in an embodiment of the present application. Figure 7 The plate surface of the clamping plate 11 that contacts the clamp assembly 20 has two limiting protrusions 113 , the two limiting protrusions 113 are arranged at intervals, and the portion of the clamp assembly 20 that contacts the clamping plate 11 is located between the two limiting protrusions 113 .

[0096] In the embodiment of the present application, the clamp assembly 20 applies pressure to the clamping plates 11 along the first direction X, and two clamping plates 11 are in contact with the clamp assembly 20 .

[0097] In some embodiments of the present application, the plate surfaces of the two clamping plates 11 that contact the clamp assembly 20 each have two limiting protrusions 113. For example, see Figures 1 to 4 When the clamping assembly 10 includes two clamping plates 11 , the two clamping plates 11 each have two limiting protrusions 113 .

[0098] In other embodiments of the present application, a plate surface of one of the two clamping plates 11 has two limiting protrusions 113 .

[0099] In some embodiments of the present application, when the clamping plate 11 includes the first clamping plate 111 , the limiting protrusion 113 may be disposed on the reinforcing protrusion 112 to facilitate setting the position of the limiting protrusion 113 .

[0100] In some embodiments of the present application, when the clamp assembly 20 includes a first clamp plate 21, a second clamp plate 22, a connecting plate 23 and a sliding member 24, the arrangement direction of the two limiting protrusions 113 on the same clamping plate 11 can be parallel to the plate surface of the connecting plate 23.

[0101] In an embodiment of the present application, two limiting protrusions 113 are provided on the plate surface of the clamping plate 11 that contacts the clamping assembly 20, and the portion of the clamping assembly 20 that contacts the clamping plate 11 is located between the two limiting protrusions 113, which can limit the position of the clamping assembly 20, reduce the possibility of movement of the clamping assembly 20, improve the stability of the isostatic pressing jig and the electrode assembly 100 during the isostatic pressing process, and improve the densification effect on the electrode assembly 100.

[0102] According to some embodiments of the present application, the material of the clamping plate 11 includes one of aluminum and steel.

[0103] Aluminum and steel are relatively common materials with low prices, which can reduce the production cost of the isostatic pressing fixture. At the same time, aluminum and steel are relatively strong, which can improve the strength of the clamping plate 11.

[0104] An embodiment of the present application provides an isostatic pressing device, which includes the isostatic pressing fixture of any one of the above embodiments.

[0105] An embodiment of the present application provides a battery production device, which includes the isostatic pressing device in the above embodiment, and the isostatic pressing device is used to perform isostatic pressing treatment on the electrode assembly 100.

[0106] An embodiment of the present application provides an isostatic pressing jig, which includes a clamping assembly 10 and a clamp assembly 20 .

[0107] The clamping assembly 10 includes two clamping plates 11, which are stacked along a first direction X. The first direction X is perpendicular to the surfaces of the clamping plates 11, and the electrode assembly 100 is located between any two adjacent clamping plates 11. The material of the clamping plates 11 includes one of aluminum and steel.

[0108] The clamp assembly 20 includes a first clamp plate 21, a second clamp plate 22, a connecting plate 23 and a sliding member 24. The first clamp plate 21 is located at one side of the clamp assembly 10 along the first direction X, the second clamp plate 22 is located at the other side of the clamp assembly 10 along the first direction X, the connecting plate 23 is located between the first clamp plate 21 and the second clamp plate 22, and the connecting plate 23 connects the second clamp plate 22 and the first clamp plate 21.

[0109] The two clamping plates 11 include a first clamping plate 111. The surface of the first clamping plate 111 that contacts the clamp assembly 20 has two reinforcing protrusions 112. The extension directions of the two reinforcing protrusions 112 are perpendicular. Along the first direction X, the maximum thickness L1 of the first clamping plate 111 and the thickness L2 of the reinforcing protrusion 112 satisfy: 1.5≤L1 / L2≤3. The maximum thickness L1 of the first clamping plate 111 is greater than or equal to 6 mm and less than or equal to 10 mm. The surface of the clamping plate 11 that contacts the clamp assembly 20 has two limiting protrusions 113. The two limiting protrusions 113 are arranged at intervals, and the portion of the clamp assembly 20 that contacts the clamping plate 11 is located between the two limiting protrusions 113.

[0110] The first fixture plate 21 has a connecting protrusion 211 and a threaded hole 215 extending along the first direction X. The threaded hole 215 passes through the connecting protrusion 211 . The sliding member 24 passes through the first fixture plate 21 and abuts against the reinforcing protrusion 112 . The sliding member 24 is threadedly connected to the threaded hole 215 .

[0111] The plate surface of the second fixture plate 22 is perpendicular to the first direction X. The first fixture plate 21 includes a first straight plate 212, a second straight plate 213 and an inclined plate 214. The plate surface of the first straight plate 212 is perpendicular to the first direction X. The sliding member 24 is connected to the first straight plate 212. The plate surface of the second straight plate 213 is perpendicular to the first direction X. The second straight plate 213 is connected to the connecting plate 23. The inclined plate 214 is located between the first straight plate 212 and the second straight plate 213. The plate surface of the inclined plate 214 intersects with the first direction X. The inclined plate 214 connects the first straight plate 212 and the second straight plate 213. Along the first direction X, the distance D1 between the first straight plate 212 and the second fixture plate 22 is greater than the distance D2 between the second straight plate 213 and the second fixture plate 22. The connecting protrusion 211 and the threaded hole 215 are both located on the first straight plate 212.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An isostatic pressing jig, characterized in that: The isostatic pressing jig is configured to clamp an electrode assembly (100), and the isostatic pressing jig comprises: A clamping assembly (10), the clamping assembly (10) being configured to clamp the electrode assembly (100); A clamp assembly (20) is at least partially located on two opposite sides of the clamp assembly (10) along a first direction, and the clamp assembly (20) is configured to apply pressure to the clamp assembly (10) along the first direction so that the clamp assembly (10) applies pressure to the electrode assembly (100).

2. The isostatic pressing jig according to claim 1, characterized in that: The clamp assembly (20) comprises: A first clamp plate (21) located on one side of the clamping assembly (10) along the first direction; A second clamp plate (22) is located on the other side of the clamping assembly (10) along the first direction, a connecting plate (23), located between the first fixture plate (21) and the second fixture plate (22), the connecting plate (23) connecting the second fixture plate (22) and the first fixture plate (21); A sliding member (24), the sliding member (24) passes through the first clamp plate (21) and abuts against the clamping assembly (10), and the sliding member (24) is slidably connected to the first clamp plate (21).

3. The isostatic pressing jig according to claim 2, characterized in that: The first fixture plate (21) has a threaded hole (215) extending along the first direction, and the sliding member (24) is threadedly connected to the threaded hole (215).

4. The isostatic pressing jig according to claim 3, characterized in that: The first fixture plate (21) has a connecting protrusion (211), and the threaded hole (215) passes through the connecting protrusion (211).

5. The isostatic pressing jig according to claim 2, characterized in that: The plate surface of the second fixture plate (22) is perpendicular to the first direction, and the first fixture plate (21) comprises: a first straight plate (212), wherein a plate surface of the first straight plate (212) is perpendicular to the first direction, and the sliding member (24) is connected to the first straight plate (212); a second straight plate (213), wherein the plate surface of the second straight plate (213) is perpendicular to the first direction, and the second straight plate (213) is connected to the connecting plate (23); an inclined plate (214), located between the first straight plate (212) and the second straight plate (213); a plate surface of the inclined plate (214) intersects with the first direction; and the inclined plate (214) connects the first straight plate (212) and the second straight plate (213); Wherein, along the first direction, a distance D1 between the first straight plate (212) and the second fixture plate (22) is greater than a distance D2 between the second straight plate (213) and the second fixture plate (22).

6. The isostatic pressing jig according to any one of claims 1 to 5, characterized in that: The clamping assembly (10) comprises: At least two clamping plates (11), at least two of the clamping plates (11) are stacked along the first direction, the first direction intersects with the surface of the clamping plates (11), and the electrode assembly (100) is located between any two adjacent clamping plates (11).

7. The isostatic pressing jig according to claim 6, characterized in that: At least two of the clamping plates (11) include a first clamping plate (111), wherein the first clamping plate (111) is located at an end portion of one of the at least two clamping plates (11) along the first direction, and a plate surface of the first clamping plate (111) in contact with the clamp assembly (20) has a reinforcing protrusion (112), and the clamp assembly (20) is configured to apply pressure to the reinforcing protrusion (112) along the first direction.

8. The isostatic pressing jig according to claim 7, characterized in that: The plate surface of the first clamping plate (111) in contact with the clamp assembly (20) is provided with two reinforcing protrusions (112), and the extension directions of the two reinforcing protrusions (112) intersect.

9. The isostatic pressing jig according to claim 7, characterized in that: Along the first direction, the maximum thickness L1 of the first clamping plate (111) and the thickness L2 of the reinforcing protrusion (112) satisfy: 1.5≤L1 / L2≤3.

10. The isostatic pressing jig according to claim 9, characterized in that: The maximum thickness L1 of the first clamping plate (111) is greater than or equal to 6 mm and less than or equal to 10 mm.

11. The isostatic pressing jig according to claim 6, characterized in that: The plate surface of the clamping plate (11) in contact with the clamp assembly (20) has two limiting protrusions (113), the two limiting protrusions (113) are arranged at intervals, and the portion of the clamp assembly (20) in contact with the clamping plate (11) is located between the two limiting protrusions (113).

12. The isostatic pressing jig according to claim 6, characterized in that: The material of the clamping plate (11) includes one of aluminum and steel.

13. An isostatic pressing device, characterized in that: The isostatic pressing device comprises the isostatic pressing jig according to any one of claims 1 to 12.

14. A battery production device, characterized in that: The battery production equipment comprises the isostatic pressing device according to claim 13, and the isostatic pressing device is used to perform isostatic pressing treatment on the electrode assembly (100).

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