Isostatic pressing jig, isostatic pressing apparatus, and battery production device
By designing the clamping components and fixture components of the isostatic pressing fixture, the problem of electrode assembly deformation and damage during the isostatic pressing process of solid-state batteries was solved, thereby improving the stability and densification effect of the electrode assembly and increasing the production yield.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-02-28
- Publication Date
- 2026-07-30
AI Technical Summary
During the isostatic pressing process, the electrode components of solid-state batteries are prone to deformation and damage, which reduces the production yield.
An isostatic pressing fixture is used, including a clamping assembly and a clamping assembly. The clamping assembly clamps the isostatic pressing film on the surface of the electrode assembly, and the clamping assembly applies pressure to the clamping assembly along a first direction to reduce the impact of isostatic pressing film deformation on the electrode assembly and provide pre-tightening force to improve the stability and densification effect of the electrode assembly.
It improves the stability and densification of electrode components, reduces electrode component movement and damage, and increases the production yield of solid-state batteries.
Smart Images
Figure CN2025079950_30072026_PF_FP_ABST
Abstract
Description
Isostatic pressing fixtures, isostatic pressing devices, and battery production equipment
[0001] Cross-referencing
[0002] This application incorporates Chinese Patent Application No. 202520146269.4, filed on January 22, 2025, entitled “Isostatic Pressure Fixture, Isostatic Pressure Apparatus and Battery Production Equipment”, which is incorporated herein by reference in its entirety. Technical Field
[0003] This application relates to the field of battery technology, and in particular to an isostatic pressing fixture, an isostatic pressing device, and battery production equipment. Background Technology
[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.
[0005] Solid-state batteries are batteries that use solid electrodes and solid electrolytes. They have high energy density, higher safety and stability, and have good development prospects in the battery field.
[0006] In related technologies, during the isostatic pressing process of solid-state battery electrode components, the electrode components are prone to deformation, which can cause damage to the electrode components and reduce the production yield of solid-state batteries. Summary of the Invention
[0007] This application aims to at least address one of the technical problems existing in the background art. Therefore, one objective of this application is to provide an isostatic pressing fixture, an isostatic pressing device, and battery production equipment to improve the production yield of solid-state batteries.
[0008] An embodiment of the first aspect of this application provides an isostatic pressing fixture configured for clamping an electrode assembly. The isostatic pressing fixture includes: a clamping assembly configured for clamping the electrode assembly; and a clamping assembly located at least partially on opposite sides of the clamping assembly along a first direction, the clamping assembly being configured to apply pressure to the clamping assembly along the first direction such that the clamping assembly applies pressure to the electrode assembly.
[0009] In the technical solution of this application embodiment, a clamping assembly is used to clamp the electrode assembly, and then a fixture assembly applies pressure to the clamping assembly along a first direction; then, the isostatic pressing fixture and the electrode assembly are placed together in an isostatic pressing container to perform isostatic pressing treatment on the electrode assembly. Because the clamping assembly clamps the isostatic pressing film on the surface of the electrode assembly, the clamping assembly can reduce the transmission of deformation of the isostatic pressing film to the electrode assembly, reduce the impact of encapsulation film deformation on the electrode assembly, improve the stability of the electrode assembly, and achieve better densification of the electrode assembly. Simultaneously, the fixture assembly provides pressure to the clamping assembly, causing the clamping assembly to provide pre-tightening force to the electrode assembly, reducing the movement of the electrode assembly, improving the stability of the electrode assembly, and increasing the production yield of solid-state batteries.
[0010] In some embodiments, the clamping assembly includes: a first clamping plate located on one side of the clamping assembly along a first direction; a second clamping plate located on the other side of the clamping assembly along the first direction; a connecting plate located between the first and second clamping plates, the connecting plate connecting the second clamping plate and the first clamping plate; and a sliding member passing through the first clamping plate and abutting against the clamping assembly, the sliding member being slidably connected to the first clamping plate. The clamping assembly is placed between the first and second clamping plates, and the sliding member is controlled to contact the clamping assembly. Then, the sliding member is controlled to slide towards the clamping assembly along the first direction, the sliding member pressing against the clamping assembly, causing the clamping assembly to apply pressure to the electrode assembly.
[0011] In some embodiments, the first clamping plate has a threaded hole extending in a first direction, and the slider is threadedly connected to the threaded hole. The threaded connection between the slider and the threaded hole on the first clamping plate allows the slider to be controlled to slide in the first direction by turning it, making the movement of the slider more convenient.
[0012] In some embodiments, the first clamping plate has a connecting protrusion through which a threaded hole passes. Providing a connecting protrusion with a threaded hole through it increases the length of the threaded hole, thereby increasing the length of the connection between the first clamping plate and the sliding member, making the connection between the first clamping plate and the sliding member more stable.
[0013] In some embodiments, the surface of the second clamping plate is perpendicular to the first direction. The first clamping plate includes: a first straight plate, the surface of which is perpendicular to the first direction, and a sliding member connected to the first straight plate; a second straight plate, the surface of which is perpendicular to the first direction, and a connecting plate; and an inclined plate located between the first and second straight plates, the surface of which intersects the first direction, and the inclined plate connects the first and second straight plates. Wherein, along the first direction, the distance D1 between the first straight plate and the second clamping plate is greater than the distance D2 between the second straight plate and the second clamping plate. The cavity in the isostatic pressure vessel is spherical or ellipsoidal, and the space near the edge of the cavity is relatively small. Since the distance D1 between the first straight plate and the second clamping plate is greater than the distance D2 between the second straight plate and the second clamping plate, and the second straight plate is located in the edge region of the entire isostatic pressure fixture, when the isostatic pressure fixture is placed in the cavity, a portion of the second straight plate can be placed close to the edge of the cavity, facilitating the placement of the isostatic pressure fixture and electrode assembly.
[0014] In some embodiments, the clamping assembly includes at least two clamping plates stacked along a first direction, the first direction intersecting the surfaces of the clamping plates, with the electrode assembly located between any two adjacent clamping plates. The clamping plates apply pressure to the electrode assembly. The clamping assembly has a relatively simple structure, simplifying its design. Furthermore, during the subsequent isostatic pressing process, the clamping plates primarily apply pressure to the center of the electrode assembly, with less pressure applied to the edges and tabs, thus reducing the likelihood of damage to the anode plate and tabs, and consequently, the entire electrode assembly.
[0015] In some embodiments, at least two clamping plates include a first clamping plate located at one end of the at least two clamping plates along a first direction. The surface of the first clamping plate that contacts the clamping assembly has a reinforcing protrusion, and the clamping 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 likelihood of the first clamping plate being crushed by the clamping assembly.
[0016] In some embodiments, the surface of the first clamping plate that contacts the clamping assembly has two reinforcing protrusions, the two reinforcing protrusions extending in intersecting directions. Providing two reinforcing protrusions with intersecting directions makes the reinforcing protrusions on the first clamping plate more uniform. The pressure exerted by the clamping assembly on the reinforcing protrusions can be more evenly transmitted to the first clamping plate through the reinforcing protrusions, thereby enabling the first clamping plate to transmit pressure to the electrode assembly more evenly and improving the densification effect on the electrode assembly.
[0017] 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. Setting L1 / L2 within the above range can improve the strength of the first clamping plate without affecting the overall miniaturized design of the isostatic pressing fixture.
[0018] 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. Setting the maximum thickness L1 of the first clamping plate within the above range can reduce the impact of excessive thickness of the first clamping plate on the overall miniaturization design of the isostatic pressure fixture without reducing the strength of the first clamping plate.
[0019] In some embodiments, the clamping plate has two limiting protrusions on the surface of the clamping plate that contacts the fixture assembly. These two limiting protrusions are spaced apart, and the portion of the fixture assembly that contacts the clamping plate is located between these two limiting protrusions. Having two limiting protrusions on the surface of the clamping plate that contacts the fixture assembly, and with the portion of the fixture assembly that contacts the clamping plate located between these two limiting protrusions, can limit the position of the fixture assembly, reduce the possibility of movement of the fixture assembly, improve the stability of the isostatic pressing fixture and electrode assembly during the isostatic pressing process, and enhance the densification effect on the electrode assembly.
[0020] In some embodiments, the clamping plate is made of either aluminum or steel. Aluminum and steel are common and inexpensive materials, which can reduce the manufacturing cost of isostatic pressing fixtures. At the same time, aluminum and steel have high strength, which can improve the strength of the clamping plate.
[0021] An embodiment of the second aspect of this application provides an isostatic pressing device, which includes the isostatic pressing fixture described in the above embodiments.
[0022] An embodiment of the third aspect of this application provides a battery production apparatus, which includes the isostatic pressing device described in the above embodiments, the isostatic pressing device being used to perform isostatic pressing treatment on electrode assemblies.
[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0024] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout multiple drawings denote 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 this application and should not be considered as limiting the scope of this application. To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly described below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.
[0025] Figure 1 is a structural schematic diagram of an isostatic pressure fixture provided in an embodiment of this application;
[0026] Figure 2 is a front view of an isostatic pressure fixture provided in an embodiment of this application;
[0027] Figure 3 is an exploded view of an isostatic pressure fixture provided in an embodiment of this application;
[0028] Figure 4 is an exploded front view of an isostatic pressure fixture provided in an embodiment of this application;
[0029] Figure 5 is an exploded view of a clamp assembly provided in an embodiment of this application;
[0030] Figure 6 is a schematic diagram of the structure of a first clamping plate provided in an embodiment of this application;
[0031] Figure 7 is a schematic diagram of the structure of a clamping plate provided in an embodiment of this application.
[0032] Explanation of reference numerals in the attached drawings: 100, electrode assembly; 10, clamping assembly; 11, clamping plate; 111, first clamping plate; 112, reinforcing protrusion; 113, limiting protrusion; 20, clamping assembly; 21, first clamping plate; 211, connecting protrusion; 212, first straight plate; 213, second straight plate; 214, inclined plate; 215, threaded hole; 22, second clamping plate; 23, connecting plate; 24, sliding component. Detailed Implementation
[0033] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.
[0034] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0035] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0037] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0038] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0039] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0040] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0041] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.
[0042] Solid-state batteries transport lithium ions through a solid electrolyte, forming a current between the positive and negative electrodes. Isostatic pressure ensures ion channels at the solid-solid interface and is a crucial step in solid-state battery fabrication. The electrode assembly of the solid-state battery is placed in a sealed container filled with a pressurized medium, and a pressurization system applies equal pressure to the electrode assembly. This reduces the intermolecular distance and increases the density without altering the external shape, thereby improving the physical properties of the electrode assembly and achieving densification.
[0043] During isostatic pressing, the electrode assembly is subjected to high pressure, making it prone to damage.
[0044] Embodiments of this application provide an isostatic pressing fixture, which includes a clamping assembly and a clamping assembly. The clamping assembly is configured to clamp an electrode assembly, with at least a portion of the clamping assembly located on opposite sides of the clamping assembly along a first direction. The clamping assembly is configured to apply pressure to the clamping assembly along the first direction, thereby applying pressure to the electrode assembly. Because the clamping assembly clamps the isostatic pressing film on the surface of the electrode assembly, the clamping assembly can reduce the transmission of deformation of the isostatic pressing film to the electrode assembly, reduce the impact of encapsulation film deformation on the electrode assembly, improve the stability of the electrode assembly, and achieve better densification of the electrode assembly. Simultaneously, the clamping assembly provides pressure to the clamping assembly, thereby providing a preload force to the electrode assembly, reducing the movement of the electrode assembly, and improving the stability of the electrode assembly.
[0045] The solid-state batteries and electrode assemblies fabricated using the isostatic pressing fixtures disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft.
[0046] This application provides an isostatic pressing fixture. Figure 1 is a schematic diagram of the structure of an isostatic pressing fixture provided in this application. Figure 2 is a front view of an isostatic pressing fixture provided in this application. Referring to Figures 1 and 2, the isostatic pressing fixture is configured to clamp an electrode assembly 100. The isostatic pressing fixture includes a clamping assembly 10 and a clamping assembly 20. The clamping assembly 10 is configured to clamp the electrode assembly 100. At least a portion of the clamping assembly 20 is located on opposite sides of the clamping assembly 10 along a first direction X. 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.
[0047] During isostatic pressing, the electrode assembly 100 is clamped in an isostatic pressing fixture, and the fixture and electrode assembly 100 are placed together in an isostatic pressing container. The pressurizing medium in the isostatic pressing container comes into contact with the electrode assembly 100. In the embodiments of this application, the surface of the electrode assembly 100 is covered with an isostatic pressing film. The isostatic pressing film is used to isolate the electrode assembly 100 from the pressurizing medium, reducing the possibility of the electrode assembly 100 being contaminated by the pressurizing medium.
[0048] For example, the isostatic membrane can be one of aluminum-plastic film, polyethylene film, or polypropylene film.
[0049] In the embodiments of this application, the clamping component 10 clamps the electrode component 100. During the isostatic pressing process, the clamping component 10 applies pressure to the electrode component 100 to achieve densification of the electrode component 100.
[0050] In the embodiments of this application, when the electrode assembly 100 is a cuboid, the first direction X can be understood as the thickness direction of the electrode assembly 100.
[0051] In the embodiments of this application, a clamping assembly 10 is used to clamp the electrode assembly 100, and then a clamping fixture assembly 20 applies pressure to the clamping assembly 10 along a first direction X; then, the isostatic pressing fixture and the electrode assembly 100 are placed together in an isostatic pressing container to perform isostatic pressing treatment on the electrode assembly 100. Because the clamping assembly 10 clamps the isostatic pressing film on the surface of the electrode assembly 100, the clamping assembly 10 can reduce the transmission of deformation of the isostatic pressing film to the electrode assembly 100, reduce the impact of encapsulation film deformation on the electrode assembly 100, improve the stability of the electrode assembly, and achieve better densification of the electrode assembly 100. Simultaneously, the clamping fixture 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, reducing the movement of the electrode assembly 100, improving the stability of the electrode assembly 100, and increasing the production yield of solid-state batteries.
[0052] According to some embodiments of this application, FIG3 is an exploded view of an isostatic pressing fixture provided in an embodiment of this application. FIG4 is a front view of an exploded view of an isostatic pressing fixture provided in an embodiment of this application. FIG5 is an exploded view of a clamping assembly provided in an embodiment of this application. Referring to FIG3 to FIG5, the clamping assembly 20 includes a first clamping plate 21, a second clamping plate 22, a connecting plate 23, and a sliding member 24. The first clamping plate 21 is located on one side of the clamping assembly 10 along the first direction X, the second clamping plate 22 is located on the other side of the clamping assembly 10 along the first direction X, the connecting plate 23 is located between the first clamping plate 21 and the second clamping plate 22, the connecting plate 23 connects the second clamping plate 22 and the first clamping plate 21, and the sliding member 24 passes through the first clamping plate 21 and abuts against the clamping assembly 10, and the sliding member 24 is slidably connected to the first clamping plate 21.
[0053] In the embodiments of this application, the first clamping plate 21 and the second clamping plate 22 are respectively located on 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.
[0054] In the embodiments of this application, the first clamping plate 21, the second clamping plate 22 and the connecting plate 23 can be manufactured in one piece; or the first clamping plate 21, the second clamping plate 22 and the connecting plate 23 can be manufactured separately and then connected together.
[0055] For example, the materials of the first clamping plate 21, the second clamping plate 22, and the connecting plate 23 can be metal or plastic.
[0056] In the embodiments of this application, the sliding direction of the slider 24 is the first direction X. Since the slider 24 passes through the first clamping plate 21 and abuts against the clamping assembly 10, during the process of the slider 24 sliding towards the clamping assembly 10, the slider 24 abuts against the clamping assembly 10 and the slider 24 applies pressure to the clamping assembly 10.
[0057] In the embodiments of this 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. Then, the sliding member 24 is controlled to slide along the first direction X towards 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.
[0058] According to some embodiments of this application, the first clamping plate 21 has a threaded hole 215 extending along a first direction X, and the sliding member 24 is threadedly connected to the threaded hole 215.
[0059] For example, the slider 24 may be a bolt; or the slider 24 may be a member with an external thread.
[0060] In the embodiments of this application, the slider 24 is threadedly connected to the threaded hole 215 on the first clamping plate 21. The slider 24 can be controlled to slide along the first direction X by turning the slider 24, making the movement of the slider 24 more convenient.
[0061] According to some embodiments of this application, the first clamping plate 21 has a connecting protrusion 211, and a threaded hole 215 passes through the connecting protrusion 211.
[0062] For example, the shape of the connecting protrusion 211 can be cylindrical or cuboid.
[0063] In some embodiments of this application, the side of the first clamping plate 21 away from the clamping assembly 10 has a connecting protrusion 211; in other embodiments of this application, the side of the first clamping plate 21 facing the clamping assembly 10 has a connecting protrusion 211; in other embodiments of this application, the two opposite sides of the first clamping plate 21 arranged along the first direction X both have connecting protrusions 211.
[0064] In the embodiments of this 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 clamping plate 21 and the sliding member 24, making the connection between the first clamping plate 21 and the sliding member 24 more stable.
[0065] According to some embodiments of this application, referring to Figures 4 and 5, the surface of the second clamping plate 22 is perpendicular to the first direction X. The first clamping plate 21 includes a first straight plate 212, a second straight plate 213, and an inclined plate 214. The surface of the first straight plate 212 is perpendicular to the first direction X, and the sliding member 24 is connected to the first straight plate 212. The surface of the second straight plate 213 is perpendicular to the first direction X and 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, and the surface of the inclined plate 214 intersects the first direction X, connecting the first straight plate 212 and the second straight plate 213. Referring to Figure 4, along the first direction X, the distance D1 between the first straight plate 212 and the second clamping plate 22 is greater than the distance D2 between the second straight plate 213 and the second clamping plate 22.
[0066] In the embodiments of this 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.
[0067] In the embodiments of this application, the distance D2 between the second clamping plates 22 is greater than the total thickness of the electrode assembly 100 after the clamping assembly 10 clamps it.
[0068] In the embodiments of this application, the connecting protrusion 211 and the threaded hole 215 are both located on the first straight plate 212.
[0069] In some embodiments, the cavity in the isostatic pressure vessel is spherical or ellipsoidal, and the space near the edge of the cavity is relatively small. Since the distance D1 between the first straight plate 212 and the second clamping plate 22 is greater than the distance D2 between the second straight plate 213 and the second clamping plate 22, and the second straight plate 213 is located in the edge region of the entire isostatic pressure fixture, when the isostatic pressure fixture is placed in the cavity, a portion of the second straight plate 213 can be close to the edge of the cavity, which facilitates the placement of the isostatic pressure fixture and the electrode assembly 100.
[0070] In the accompanying drawings of this application embodiment, the slider 24 is only placed on one side of the first clamping plate 21 along the first direction X. The slider 24 is not connected to the first clamping plate 21. When the slider 24 is connected to the first clamping plate 21 and the slider 24 abuts against the clamping assembly 10, only a small part of the slider 24 protrudes from the first clamping plate 21, and will not have a significant impact on the thickness of the entire isostatic pressing fixture.
[0071] In some other embodiments of this application, a shorter slider 24 may also be selected, so that the slider 24 can pass through the first clamping plate 21 and abut against the clamping assembly 10, while the thickness of the slider 24 protruding from the first clamping plate 21 is small, reducing the impact on the thickness of the entire isostatic pressing fixture.
[0072] According to some embodiments of this application, referring to Figures 3 and 4, the clamping assembly 10 includes at least two clamping plates 11, which are stacked along a first direction X, the first direction X intersecting the surface of the clamping plates 11, and the electrode assembly 100 is located between any two adjacent clamping plates 11.
[0073] In some embodiments of this application, the clamping assembly 10 may include two clamping plates 11, with the electrode assembly 100 located between the two clamping plates 11.
[0074] In other implementations, the clamping assembly 10 may include a greater number of clamping plates 11, with the electrode assembly 100 located between any two adjacent clamping plates 11, that is, one clamping assembly 10 can clamp multiple electrode assemblies 100.
[0075] In embodiments of this application, the first direction X is perpendicular to the surface of the clamping plate 11. Alternatively, the first direction X has a component that is 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°.
[0076] In the embodiments of this application, the clamping assembly 20 applies pressure to the clamping plate 11 along the first direction X, so that any two adjacent clamping plates 11 move closer to each other, and the clamping plates 11 provide a preload force to the electrode assembly 100. During the isostatic pressing process, the pressurizing medium pushes the clamping plates 11 closer to each other, so that the clamping plates 11 apply pressure to the electrode assembly 100, thereby achieving densification of the electrode assembly.
[0077] In some embodiments of this application, the clamping plate 11 is generally a rectangular plate. In other implementations, the clamping plate 11 may also be a plate structure of other shapes, such as a circular plate.
[0078] In related technologies, electrode assemblies coated with isostatic films are typically placed directly into the cavity of an isostatic pressing container for isostatic pressing. In these electrode assemblies, the anode electrode extends beyond the cathode electrode in both its width and length directions. This is to prevent excessive lithium ions from being released from the cathode active material during charging, which could prevent them from fully inserting into the anode active material and thus causing lithium plating on the anode surface, posing a safety risk. The area where the anode electrode extends beyond the cathode electrode in both width and length directions is called the overhang. During the densification process of the electrode assembly, the tabs and the anode electrode at the overhang are easily broken, causing damage to the electrode assembly.
[0079] In the isostatic pressing fixture provided in this application embodiment, the electrode assembly 100 is pressurized by the clamping plate 11. The structure of the clamping assembly 10 is relatively simple, which simplifies 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 clamping plate 11 applies less pressure to the edge and tab of the electrode assembly, which can reduce the possibility of damage to the anode plate and tab, and reduce the possibility of damage to the electrode assembly 100.
[0080] In the embodiments of this application, the clamping plate 11 contacts the entire 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.
[0081] According to some embodiments of this application, referring to Figures 3 and 4, at least two clamping plates 11 include a first clamping plate 111, which is located at one end of one of the at least two clamping plates 11 along a first direction X. Figure 6 is a schematic structural diagram of a first clamping plate provided in an embodiment of this application. Referring to Figures 3 and 6, the plate surface of the first clamping plate 111 that contacts the clamping assembly 20 has a reinforcing protrusion 112, and the clamping assembly 20 is configured to apply pressure to the reinforcing protrusion 112 along the first direction X.
[0082] In an embodiment of this application, when the clamp assembly 20 includes a slider 24, the first clamping plate 111 is located at the end of one of the at least two clamping plates 11 near the slider 24, at least a portion of the reinforcing protrusion 112 is opposite to the slider 24, and the slider 24 applies pressure to the reinforcing protrusion 112.
[0083] In the embodiments of this application, the reinforcing protrusion 112 can increase the strength of the first clamping plate 111 and reduce the possibility that the first clamping plate 111 will be crushed by the clamping assembly 20.
[0084] According to some embodiments of this application, referring to Figures 3 and 6, the plate surface of the first clamping plate 111 that contacts the clamping assembly 20 has two reinforcing protrusions 112, and the extending directions of the two reinforcing protrusions 112 intersect.
[0085] In some embodiments of this application, referring to FIG6, the two reinforcing protrusions 112 are distributed in a cross shape, that is, the extension directions of the two reinforcing protrusions 112 are perpendicular.
[0086] For example, 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 reinforcing protrusion 112 is equal to the width of the first clamping plate 111.
[0087] In some other embodiments of this application, the extending directions of the two reinforcing protrusions 112 may intersect but not be perpendicular.
[0088] In the embodiments of this application, two reinforcing protrusions 112 are provided, and the extending directions of the two reinforcing protrusions 112 intersect, so that the reinforcing protrusions 112 on the first clamping plate 111 are more uniform. The pressure of the clamping assembly 20 on the reinforcing protrusions 112 can be transmitted to the first clamping plate 111 more uniformly through the reinforcing protrusions 112, thereby enabling the first clamping plate 111 to transmit pressure to the electrode assembly 100 more uniformly and improve the densification effect of the electrode assembly 100.
[0089] According to some embodiments of this application, referring to FIG4, 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.
[0090] For example, L1 / L2 = 2.
[0091] If the value of L1 / L2 is too small, the thickness L2 of the reinforcing protrusion 112 will be 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 small, which will not be able to effectively improve the strength of the first clamping plate 111.
[0092] In the embodiments of this application, setting L1 / L2 within the above-mentioned range can improve the strength of the first clamping plate 111 without affecting the overall miniaturized design of the isostatic pressure fixture.
[0093] According to some embodiments of this application, 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.
[0094] For example, the maximum thickness L1 of the first clamping plate 111 is equal to 8 mm.
[0095] In the embodiments of this 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 pressure fixture without reducing the strength of the first clamping plate 111.
[0096] According to some embodiments of this application, FIG7 is a schematic diagram of the structure of a clamping plate provided in an embodiment of this application. Referring to FIG7, the plate surface of the clamping plate 11 that contacts the clamping assembly 20 has two limiting protrusions 113, the two limiting protrusions 113 are arranged at intervals, and the part of the clamping assembly 20 that contacts the clamping plate 11 is located between the two limiting protrusions 113.
[0097] In the embodiments of this application, the clamping assembly 20 applies pressure to the clamping plate 11 along the first direction X, and two clamping plates 11 are in contact with the clamping assembly 20.
[0098] In some embodiments of this application, the surfaces of the two clamping plates 11 that contact the clamping assembly 20 each have two limiting protrusions 113. For example, referring to Figures 1 to 4, when the clamping assembly 10 includes two clamping plates 11, both clamping plates 11 have two limiting protrusions 113.
[0099] In other embodiments of this application, one of the clamping plates 11 has two limiting protrusions 113 on its surface.
[0100] In some embodiments of this application, when the clamping plate 11 includes a first clamping plate 111, the limiting protrusion 113 can be provided on the reinforcing protrusion 112 to facilitate setting the position of the limiting protrusion 113.
[0101] In some embodiments of this application, when the clamping assembly 20 includes a first clamping plate 21, a second clamping 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 surface of the connecting plate 23.
[0102] In the embodiments of this application, there are two limiting protrusions 113 on the plate surface of the clamping plate 11 that contacts the clamping assembly 20, and the part of the clamping assembly 20 that contacts the clamping plate 11 is located between the two limiting protrusions 113. This can limit the position of the clamping assembly 20, reduce the possibility of the clamping assembly 20 moving, improve the stability of the isostatic pressing fixture and the electrode assembly 100 during the isostatic pressing process, and improve the densification effect on the electrode assembly 100.
[0103] According to some embodiments of this application, the clamping plate 11 is made of either aluminum or steel.
[0104] Aluminum and steel are common and inexpensive materials, which can reduce the manufacturing cost of isostatic pressing fixtures. At the same time, aluminum and steel have high strength, which can improve the strength of clamping plate 11.
[0105] This application provides an isostatic pressing device, which includes the isostatic pressing fixture of any of the above embodiments.
[0106] This application provides a battery production equipment, which includes the isostatic pressing device described in the above embodiment. The isostatic pressing device is used to perform isostatic pressing treatment on the electrode assembly 100.
[0107] An embodiment of this application provides an isostatic pressing fixture, which includes a clamping assembly 10 and a clamping assembly 20.
[0108] The clamping assembly 10 includes two clamping plates 11 stacked along a first direction X, which is perpendicular to the surface of the clamping plates 11. The electrode assembly 100 is located between any two adjacent clamping plates 11. The clamping plates 11 are made of either aluminum or steel.
[0109] The clamping assembly 20 includes a first clamping plate 21, a second clamping plate 22, a connecting plate 23, and a sliding member 24. The first clamping plate 21 is located on one side of the clamping assembly 10 along the first direction X, the second clamping plate 22 is located on the other side of the clamping assembly 10 along the first direction X, and the connecting plate 23 is located between the first clamping plate 21 and the second clamping plate 22, connecting the second clamping plate 22 and the first clamping plate 21.
[0110] The two clamping plates 11 include a first clamping plate 111. The surface of the first clamping plate 111 that contacts the clamping assembly 20 has two reinforcing protrusions 112. The two reinforcing protrusions 112 extend perpendicularly along a first direction X. The maximum thickness L1 of the first clamping plate 111 and the thickness L2 of the reinforcing protrusions 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 clamping assembly 20 has two limiting protrusions 113, which are spaced apart. The portion of the clamping assembly 20 that contacts the clamping plate 11 is located between the two limiting protrusions 113.
[0111] The first clamping 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 clamping plate 21 and abuts against the reinforcing protrusion 112. The sliding member 24 is threadedly connected to the threaded hole 215.
[0112] The surface of the second clamping plate 22 is perpendicular to the first direction X. The first clamping plate 21 includes a first straight plate 212, a second straight plate 213, and an inclined plate 214. The surface of the first straight plate 212 is perpendicular to the first direction X, and the sliding member 24 is connected to the first straight plate 212. The surface of the second straight plate 213 is perpendicular to the first direction X and 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, and its surface intersects 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 clamping plate 22 is greater than the distance D2 between the second straight plate 213 and the second clamping plate 22. The connecting protrusion 211 and the threaded hole 215 are both located on the first straight plate 212.
[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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 fixture, the isostatic pressing fixture being configured for clamping an electrode assembly (100), the isostatic pressing fixture comprising: A clamping assembly (10) configured to clamp the electrode assembly (100); A clamping assembly (20), at least partially located on opposite sides of the clamping assembly (10) along a first direction, the clamping assembly (20) being configured to apply pressure to the clamping assembly (10) along the first direction such that the clamping assembly (10) applies pressure to the electrode assembly (100).
2. The isostatic pressing fixture according to claim 1, wherein, The clamp assembly (20) includes: The first clamping plate (21) is located on one side of the clamping assembly (10) along the first direction; The second clamping plate (22) is located on the other side of the clamping assembly (10) along the first direction. A connecting plate (23) is located between the first clamping plate (21) and the second clamping plate (22), and the connecting plate (23) connects the second clamping plate (22) and the first clamping plate (21); A sliding member (24) passes through the first clamping plate (21) and abuts against the clamping assembly (10). The sliding member (24) is slidably connected to the first clamping plate (21).
3. The isostatic pressing fixture according to claim 2, wherein, The first clamp 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 fixture according to claim 3, wherein, The first clamp plate (21) has a connecting protrusion (211), and the threaded hole (215) passes through the connecting protrusion (211).
5. The isostatic pressing fixture according to any one of claims 2 to 4, wherein, The surface of the second clamping plate (22) is perpendicular to the first direction, and the first clamping plate (21) includes: The first straight plate (212) has a plate surface perpendicular to the first direction, and the sliding member (24) is connected to the first straight plate (212). The second straight plate (213) has its surface perpendicular to the first direction and is connected to the connecting plate (23). An inclined plate (214) is located between the first straight plate (212) and the second straight plate (213). The surface of the inclined plate (214) intersects the first direction. The inclined plate (214) connects the first straight plate (212) and the second straight plate (213). Along the first direction, the distance D1 between the first straight plate (212) and the second clamping plate (22) is greater than the distance D2 between the second straight plate (213) and the second clamping plate (22).
6. The isostatic pressing fixture according to any one of claims 1 to 5, wherein, The clamping assembly (10) includes: At least two clamping plates (11) are stacked along the first direction, which intersects 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 fixture according to claim 6, wherein, At least two of the clamping plates (11) include a first clamping plate (111) located at one end of the at least two clamping plates (11) along the first direction, the plate surface of the first clamping plate (111) in contact with the clamping assembly (20) having a reinforcing protrusion (112), the clamping assembly (20) being configured to apply pressure to the reinforcing protrusion (112) along the first direction.
8. The isostatic pressing fixture according to claim 7, wherein, The first clamping plate (111) has two reinforcing protrusions (112) on the plate surface that contacts the clamping assembly (20), and the two reinforcing protrusions (112) extend in intersecting directions.
9. The isostatic pressing fixture according to claim 7 or 8, wherein, 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 fixture according to any one of claims 7 to 9, wherein, 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 fixture according to any one of claims 6 to 10, wherein, The clamping plate (11) has two limiting protrusions (113) on the plate surface that contacts the clamping assembly (20). The two limiting protrusions (113) are arranged at intervals, and the part of the clamping assembly (20) that contacts the clamping plate (11) is located between the two limiting protrusions (113).
12. The isostatic pressing fixture according to any one of claims 6 to 11, wherein, The clamping plate (11) is made of either aluminum or steel.
13. An isostatic pressing device, the isostatic pressing device comprising an isostatic pressing fixture as described in any one of claims 1 to 12.
14. A battery manufacturing apparatus, the battery manufacturing apparatus comprising an isostatic pressing device as described in claim 13, the isostatic pressing device being used to perform isostatic pressing treatment on an electrode assembly (100).