Lithium ion battery formation gasket structure
By using a composite gasket structure in the lithium-ion battery transformation process, including a solid shell and porous, powder, liquid or gas-phase contents, the problem of uneven stress during the lithium-ion battery transformation process is solved, the battery fit and consistency are improved, and the SEI film quality and battery life are improved.
Patent Information
- Application Number
- CN202422207139.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-09
AI Technical Summary
Intrinsic thickness differences in different regions of lithium-ion batteries in the chemical formation process, resulting in uneven stress, affecting the flatness and consistency of the battery, thereby reducing the quality of the SEI film and battery life.
The composite gasket structure is adopted, including a solid shell and porous, powder, liquid or gaseous contents, to ensure continuous fit with the surface of the battery cell, improve resilience and stress uniformity, and improve the fit and consistency of the battery cell.
Through the composite gasket structure, the fit and consistency of the battery cell in the formation process are improved, the formation of high-quality SEI film is ensured, and the cycle life and performance consistency of lithium-ion batteries are improved.
Smart Images
Figure CN223245674U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a lithium-ion battery formation gasket structure. Background Art
[0002] The lithium battery formation process is a key step in the manufacturing process of lithium-ion batteries. The lithium battery formation process has a vital impact on the formation of SEI film, activation of active materials, internal resistance and self-discharge, battery consistency and safety performance.
[0003] Due to the different folds at the head and tail of the pole piece and the different structures of the tab position, different areas of the lithium-ion battery have different intrinsic thicknesses, which affects the flatness of the battery. In addition, the formation equipment used in the currently commonly used formation process adopts an overall loading method, which can easily lead to uneven force on the lithium-ion battery and poor consistency of the lithium-ion battery during the formation process. During the formation process, different lithium-ion batteries and different areas of the lithium-ion battery are subjected to uneven force, which further leads to poor lamination of the lithium-ion battery pole piece and poor consistency of the lithium-ion battery, thereby affecting the quality of the formed SEI film and causing local lithium deposition during the cycle process (especially at the tab position and the edge area of the pole piece), ultimately reducing the service life of the battery.
[0004] To address the inherent thickness differences between different regions of lithium-ion batteries, formation gaskets are added to the formation equipment during the formation process. These gaskets are used to transfer loads and ensure full contact between the battery electrodes. However, the formation gaskets used in traditional solutions are usually solid gaskets. Due to the large elastic modulus of solid gaskets, differences in battery cell flatness and uneven loads can easily lead to uneven force on the electrodes and poor cell contact. This further deteriorates the SEI film consistency and electrode contact, ultimately reducing the battery cycle life and consistency. Utility Model Content
[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a lithium-ion battery formation gasket structure, which can improve the uniformity and consistency of the force on the surface of the formation battery cell.
[0006] The first aspect of the present application provides a lithium-ion battery formation gasket structure, which is arranged on the inner surface of a lithium-ion battery formation clamping device, and includes a composite gasket for being attached to one side of a lithium-ion battery cell. The composite gasket includes a solid shell and contents, the solid shell is wrapped around the contents, and the contents are a porous structure, a powder structure, a liquid phase structure or a gas phase structure.
[0007] Furthermore, the content is a porous structure, the elastic modulus of the content material is lower than 10 MPa, and the content is rubber, latex or industrial sponge.
[0008] Furthermore, the contents are in a liquid phase structure, and the contents are metal powder, inorganic powder, ceramic powder, or plastic powder.
[0009] Furthermore, the content is a liquid phase structure, and the content is water, mineral oil, biological oil, emulsion, liquid metal, ethanol, methanol, carbon tetrachloride, ether or ethyl acetate.
[0010] Furthermore, the contents are in a gaseous structure, and the contents are air, nitrogen, carbon dioxide, helium, neon, argon or xenon.
[0011] Furthermore, the solid shell is made of rubber, latex, or industrial sponge.
[0012] Furthermore, the thickness of the composite gasket is less than 20 mm.
[0013] Furthermore, the thickness of the contents is greater than 50% of the total thickness of the composite gasket.
[0014] Furthermore, the thickness of the solid shell is less than 50% of the total thickness of the composite gasket.
[0015] Furthermore, there are two composite gaskets, which are respectively attached to two opposite sides of the battery cell of the lithium-ion battery.
[0016] Furthermore, the lithium-ion battery formation gasket structure further includes a connector, which is connected to the two composite gaskets respectively, and the connector and the two composite gaskets form a U shape.
[0017] The technical solution provided by the present application may include the following beneficial effects: the non-solid contents are wrapped in a solid shell, and the solid shell ensures that the composite gasket can continuously fit with the surface of the battery cell, and the contents are one of a porous structure, a powder structure, a liquid phase structure or a gas phase structure, so that the composite gasket has better resilience than the traditional solid gasket. In the formation process of the battery cell, the pressure of the composite gasket on the battery cell is more uniform, which greatly improves the fit and consistency of the battery cell in the formation process, thereby ensuring the formation of a high-quality SEI film and improving the cycle life and performance consistency of the lithium-ion battery.
[0018] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The above and other objects, features and advantages of the present application will become more apparent by describing in more detail exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.
[0020] Figure 1 Schematic diagram of the structure of a lithium-ion battery formation gasket structure shown in an embodiment of the present application;
[0021] Figure 2 This is another structural schematic diagram of the lithium-ion battery formation gasket structure shown in an embodiment of the present application.
[0022] Reference numerals: composite gasket 1; solid shell 2; content 3; formed plywood 4; flame-retardant business card paper 5; connector 6; battery cell 7. DETAILED DESCRIPTION
[0023] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.
[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0025] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
[0026] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," and the like should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0027] In response to the above problems, an embodiment of the present application provides a lithium-ion battery formation gasket structure, which can improve the uniformity and consistency of the force on the surface of the formation battery cell.
[0028] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
[0029] Figure 1 It is a structural schematic diagram of a lithium-ion battery formation gasket structure shown in an embodiment of the present application.
[0030] See also Figure 1 In the first aspect of the present application, a lithium-ion battery formation gasket structure is provided. In the formation process of the lithium-ion battery, the lithium-ion battery formation gasket structure is arranged on the inner surface of the lithium-ion battery formation clamping device. The lithium-ion battery formation gasket structure includes a composite gasket 1, and the composite gasket 1 can be attached to one side of the battery cell 7 of the lithium-ion battery. The composite gasket 1 includes a solid shell 2 and content 3. The solid shell 2 is made of rubber, latex, industrial sponge, etc., and the solid shell 2 is a solid structure. The solid shell 2 is wrapped around the content 3, and the content 3 is a non-solid structure. The content 3 is a porous structure, a powder structure, a liquid phase structure or a gas phase structure.
[0031] The lithium-ion battery formation clamping device includes a pair of formation clamping plates 4 and flame-retardant business card paper 5. When the lithium-ion battery cell 7 needs to be formed, the flame-retardant business card paper 5 is wrapped around the surface of the cell 7, and the composite gasket 1 is attached to the side of the cell 7 wrapped with the flame-retardant business card paper 5. The two formation clamping plates 4 are arranged on opposite sides of the cell 7. The cell 7 wrapped with the flame-retardant business card paper 5 and the composite gasket 1 are clamped together by the two formation clamping plates 4. The two formation clamping plates 4 are pressurized and heated to form the cell 7.
[0032] The present application wraps the non-solid content 3 with a solid shell 2. The solid shell 2 ensures that the composite gasket 1 can continuously fit with the surface of the battery cell, and the content is one of a porous structure, a powder structure, a liquid phase structure or a gas phase structure, so that the composite gasket 1 has better resilience than the traditional solid gasket. In the formation process of the battery cell 7, the pressure of the composite gasket 1 on the battery cell 7 is more uniform, which greatly improves the fit and consistency of the battery cell 7 in the formation process, thereby ensuring the formation of a high-quality SEI film and improving the cycle life and performance consistency of the lithium-ion battery.
[0033] In some embodiments, the content 3 is a porous structure, the elastic modulus of the material of the content 3 is less than 10 MPa, and the content 3 is made of rubber, latex, or industrial sponge. The material of the content 3 can be the same as that of the solid shell 2. The difference between the content 3 and the solid shell 2 is that a number of blind holes or through holes are set in the content 3. Compared with traditional elasto-plastic and elastomeric materials, the porous structure of the content 3 has a smaller elastic modulus, that is, the stress difference is smaller under the same deformation difference. In addition, the composite gasket 1 with a porous structure wrapped by the solid shell 2 has a further reduced elastic modulus compared to the traditional solid gasket, which greatly improves the uniformity and consistency of the force on the surface of the formed battery cell 7. At the same time, the thinner solid shell 2 around it ensures contact with the surface of the battery cell 7 and the consistency of the force, ensuring the smooth appearance of the battery cell 7. The porous structure of the content 3 can generate a large tensile strain in the lateral direction, thereby significantly reducing the elastic modulus of the composite gasket 1. The porous structure of the content 3 can coordinate deformation in different areas, ultimately improving the uniformity of stress in the contact area of the outer surface of the composite gasket 1.
[0034] In some embodiments, the contents 3 are powdery, and the contents 3 may be metal powder, inorganic powder, ceramic powder, plastic powder, or combinations thereof. For the composite gasket 1 having a powdery structure encased in a solid shell 2, even if there are variations in the surface flatness of the battery cells 7, the powder structure can flow under load, coordinating deformation and stress distribution, ensuring equal pressure in all directions, and strictly ensuring uniform stress applied by the composite gasket 1 to the surface of the battery cells 7.
[0035] In some embodiments, the content 3 is a liquid phase structure, and the content 3 is water, mineral oil, bio-oil, emulsion, liquid metal, ethanol, methanol, carbon tetrachloride, ether, ethyl acetate, or combinations thereof. For a composite gasket 1 having a liquid phase structure encased in a solid shell 2, even if there are some variations in the surface flatness of the battery cells 7, the pressure applied to the liquid phase structure in all directions is equal when loaded, thus strictly ensuring uniform stress applied by the composite gasket 1 to the surface of the battery cells 7.
[0036] In some embodiments, the contents 3 are gaseous, and the contents 3 may be air, nitrogen, carbon dioxide, helium, neon, argon, xenon, or combinations thereof. For a composite gasket 1 having a gaseous structure encased in a solid shell 2, even if there are variations in the surface flatness of the battery cells 7, the gaseous structure experiences equal pressure in all directions when subjected to a load, thus ensuring uniform stress applied by the composite gasket 1 to the surface of the battery cells 7.
[0037] The thickness of the composite gasket 1 is less than 20 mm, ensuring that the composite gasket 1 does not occupy excessive space in the lithium-ion battery formation clamping equipment, ensuring that the formation process of the battery cell 7 can proceed normally. The thickness of the contents 3 is greater than 50% of the total thickness of the composite gasket 1, and the thickness of the solid shell 2 is less than 50% of the total thickness of the composite gasket 1, ensuring that the contents 3 can fully improve the uniformity and consistency of the force applied to the surface of the formed battery cell 7.
[0038] In some embodiments, there are two composite gaskets 1 , which are respectively attached to two opposite sides of the battery cell 7 of the lithium-ion battery to ensure uniformity and consistency of force applied to the two opposite sides of the battery cell 7 .
[0039] Figure 2 This is another structural schematic diagram of the lithium-ion battery formation gasket structure shown in an embodiment of the present application.
[0040] See also Figure 2 In some embodiments, the lithium-ion battery formation gasket structure further includes a connector 6, which is connected to the two composite gaskets 1, forming a U-shape with the connector 6. The connector 6 can securely attach the two composite gaskets 1 to the battery cell 7, thereby improving the stability of the connection between the two composite gaskets 1. The connector is a solid structure made of rubber, latex, or industrial sponge.
[0041] The scheme of the present application has been described in detail above with reference to the accompanying drawings. In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the description are not necessarily required for this application. In addition, it is understood that the steps in the method of the embodiment of the present application can be adjusted in sequence, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.
[0042] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.
Claims
1. A lithium-ion battery formation gasket structure, arranged on the inner surface of a lithium-ion battery formation clamping device, characterized in that: The invention comprises a composite gasket (1) for being attached to one side of a lithium-ion battery cell (7), wherein the composite gasket (1) comprises a solid shell (2) and contents (3), wherein the solid shell (2) is wrapped around the contents (3), and the contents (3) are of a porous structure, a powder structure, a liquid phase structure, or a gas phase structure.
2. The lithium-ion battery formation gasket structure according to claim 1, wherein: The content (3) is a porous structure, the elastic modulus of the material of the content (3) is lower than 10 MPa, and the content (3) is rubber, latex or industrial sponge.
3. The lithium-ion battery formation gasket structure according to claim 1, wherein: The content (3) is a powder structure, and the content (3) is metal powder, inorganic powder, ceramic powder or plastic powder.
4. The lithium-ion battery formation gasket structure according to claim 1, wherein: The content (3) is a liquid phase structure, and the content (3) is water, mineral oil, biological oil, emulsion, liquid metal, ethanol, methanol, carbon tetrachloride, ether or ethyl acetate.
5. The lithium-ion battery formation gasket structure according to claim 1, wherein: The content (3) is a gas phase structure, and the content (3) is air, nitrogen, carbon dioxide, helium, neon, argon or xenon.
6. The lithium-ion battery formation gasket structure according to claim 1, wherein: The solid shell (2) is made of rubber, latex, or industrial sponge.
7. The lithium-ion battery formation gasket structure according to claim 1, wherein: The thickness of the composite gasket (1) is less than 20 mm.
8. The lithium-ion battery formation gasket structure according to claim 1, wherein: The thickness of the content (3) is greater than 50% of the total thickness of the composite gasket (1).
9. The lithium-ion battery formation gasket structure according to claim 1, characterized in that: The thickness of the solid shell (2) is less than 50% of the total thickness of the composite gasket (1).
10. The lithium-ion battery formation gasket structure according to claim 1, characterized in that: There are two composite gaskets (1), and the two composite gaskets (1) are respectively attached to two opposite sides of the battery core (7) of the lithium ion battery.
11. The lithium-ion battery formation gasket structure according to claim 9, characterized in that: It also includes a connecting piece (6), wherein the connecting piece (6) is connected to the two composite gaskets (1) respectively, and the connecting piece (6) and the two composite gaskets (1) form a U shape.