Battery cell shell with insulating coating and lithium ion battery

Abstract

The utility model discloses a battery cell shell with insulating coating and a lithium ion battery, and relates to the technical field of battery cell shells, the battery cell shell comprises a battery cell shell body and a top cover plate, one end of the battery cell shell body is open, the battery cell shell body is an accommodating cavity used for accommodating a naked battery cell, the top cover plate is fixed at the open end of the accommodating cavity and is sealed in the accommodating cavity, and the insulating coating is arranged in the accommodating cavity. A top cover assembly is arranged on the top cover plate and comprises a positive pole, a negative pole, an anti-explosion valve, an identification code, a liquid injection hole and a sealing nail connected with the liquid injection hole; a general coating is coated on the outer surface of the battery cell shell body, a general coating is coated on the outer surface of the top cover plate except a top cover assembly area, an identifiable coating is coated on an identification code area on the outer surface of the top cover plate, the general coating is an opaque coating, and the identifiable coating is a transparent coating. According to the utility model, the safety and the reliability of the battery cell can be improved, the production efficiency is improved, the unqualified phenomena of missing spraying, excessive spraying and the like of a product are prevented, and the bonding strength of a coating is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core shells, in particular to a battery core shell with an insulating coating and a lithium ion battery. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Currently, lithium-ion battery cells on the market are typically wrapped with PET blue film tape to provide insulation and protection. However, in actual production, PET blue film wrapping has problems such as wasted space, uneven thickness, susceptibility to warping, and easy scratching and damage, which affect the insulation safety of the battery cells. Furthermore, the blue film wrapping mechanism has certain requirements for different battery cell models. When it comes to blue film insulation for different battery cell models, there are disadvantages such as high conversion costs, large space requirements for blue film wrapping equipment, and high process costs.

[0004] To this end, electrostatic powder coating has been developed to create a coating for battery cell casings, replacing blue film for high-end battery cells. However, existing powder coating methods produce a thin coating, and the coating is often transparent. This makes it difficult to distinguish between coated and uncoated battery cell casings, often resulting in unqualified results such as missed coating or over-spraying. Furthermore, existing spray coating methods also suffer from poor bonding strength. Utility Model Content

[0005] In response to the above-mentioned problems and defects in the prior art, the utility model provides a battery cell shell and a lithium-ion battery with an insulating coating. The battery cell shell is engraved with a code, and the battery cell shell is sprayed with an insulating material with a certain transparency / opacity and color by inkjet coating, so that a safe and reliable colloid coating is attached to the outside of the battery cell shell. On the one hand, it reduces space waste, reduces organizational costs, improves production efficiency, and improves the safety and reliability of the battery cell. On the other hand, it facilitates online automatic recognition of the engraved code during production and use, and combines transparency / opacity and color spraying to prevent unqualified products such as missed spraying and over-spraying. The outer surface of the battery cell shell is used as the coating attachment substrate, and the coating attachment substrate is pre-treated and roughened before spraying, so that the coating is tightly attached to the product surface, thereby enhancing the bonding strength of the coating.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] In a first aspect, the utility model provides a battery cell shell with an insulating coating.

[0008] A battery cell casing with an insulating coating, comprising a battery cell casing body and a top cover plate, wherein the battery cell casing body is an accommodating cavity with one end open for accommodating bare batteries, the top cover plate is fixed to the open end of the accommodating cavity and sealed in the accommodating cavity, and a top cover assembly is provided on the top cover plate, the top cover assembly comprising positive and negative poles, an explosion-proof valve, an identification code, a liquid injection hole, and a sealing pin connected to the liquid injection hole;

[0009] The outer surface of the battery cell shell body is coated with a universal coating, the outer surface of the top cover plate except the top cover component area is coated with a universal coating, and the identification code area on the outer surface of the top cover plate is coated with an identifiable coating, the universal coating is an opaque coating, and the identifiable coating is a transparent coating.

[0010] According to a further technical solution, the outer surface of the battery cell shell body is pretreated by laser or corrosive liquid, and the pretreated outer surface is sprayed with an opaque insulating material to form a universal coating.

[0011] According to a further technical solution, the outer surface of the top cover plate except the top cover component area is pretreated by laser or etching liquid, and the pretreated outer surface is sprayed with an opaque insulating material to form a universal coating.

[0012] According to a further technical solution, a transparent insulating material is sprayed on the identification code area on the outer surface of the top cover plate to form an identifiable coating.

[0013] According to a further technical solution, the outer surface of the battery cell shell body is used as a coating attachment substrate, which is roughened after pretreatment to form at least one irregular gap-like structure on the outer surface.

[0014] According to a further technical solution, the outer surface of the top cover plate except for the top cover component area is used as a coating attachment substrate, which is roughened after pretreatment to form at least one irregular gap-like structure on the outer surface.

[0015] According to a further technical solution, the universal coating includes a bonding area and a coating area, wherein the bonding area is the area where the coating and the coating attachment substrate are bonded, and the sprayed material in the bonding area fills each irregular void structure.

[0016] According to a further technical solution, the coating area is the coating body, and the coating area is coated and covers the entire bonding area and the coating attachment substrate.

[0017] According to a further technical solution, the spraying thickness of the coating area is greater than 30 μm and less than 160 μm.

[0018] In a second aspect, the utility model provides a lithium-ion battery.

[0019] A lithium-ion battery comprises a cell shell with an insulating coating as described in the first aspect and a bare cell, wherein the bare cell is fixedly mounted inside the cell shell.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The utility model proposes a battery cell shell and a lithium-ion battery with an insulating coating, wherein a code (including a QR code, a digital code or other identification code, etc.) is engraved on the battery cell shell, and an insulating material with a certain transparency and color is sprayed on the engraved area by inkjet coating, and an insulating material with a certain opacity and color is sprayed on other feasible areas of the battery cell shell, so that a safe and reliable colloid coating is attached to the outside of the battery cell shell, which reduces space waste, reduces organizational costs, improves production efficiency, improves the safety and reliability of the battery cell, and makes it easy for the sprayed product to be automatically identified online during production and use. The combination of transparency / opacity and color spraying can jointly prevent unqualified products such as missed spraying and over-spraying.

[0022] 2. In the present invention, the outer surface of the battery cell shell is used as the coating attachment substrate. The substrate is pre-treated with laser or corrosive liquid to roughen the surface. At this time, a large number of irregular void structures are formed on the outer surface. Each irregular void structure is filled with spray material to form a bonding area between the coating and the surface of the battery cell shell, and the coating area is sprayed on the bonding area and the coating attachment substrate. In this way, the coating can be tightly attached to the product surface, effectively enhancing the bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0024] Figure 1 This is a schematic structural diagram of the battery cell housing with an insulating coating according to the present invention;

[0025] Figure 2 It is a structural schematic diagram of the universal coating in the utility model.

[0026] Among them, 101, general coating; 102, identifiable coating; 2, battery cell shell; 201, battery cell shell body; 202, top cover plate; 203, positive and negative poles; 204, explosion-proof valve; 205, identification code; 206, injection hole; 1011, coating area; 1012, bonding area; 1013, coating attachment substrate. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0028] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0029] Example 1

[0030] The utility model discloses a battery cell shell with an insulating coating. The battery cell shell structure is applicable to, but not limited to, square battery cells, blade battery cells, cylindrical battery cells, etc. In the utility model, square battery cells are taken as an example. Figure 1 As shown, the battery cell case 2 includes a battery cell case body 201 and a top cover plate 202, wherein the battery cell case body 201 is an accommodating cavity with one end open for accommodating bare batteries, the top cover plate 202 is fixed to the open end of the accommodating cavity and is closed in the accommodating cavity, and a top cover assembly is provided on the top cover plate, which includes positive and negative poles 203, an explosion-proof valve 204, an identification code 205, a liquid injection hole 206 and a sealing nail connected to the liquid injection hole.

[0031] Furthermore, the outer surface of the battery cell shell body 201 is coated with a universal coating 101, and the outer surface of the top cover plate 202 is coated with a universal coating 101 except for the top cover component area. The identification code 205 area on the outer surface of the top cover plate 202 is coated with an identifiable coating 102. The universal coating 101 is an opaque coating, and the identifiable coating 102 is a transparent coating. Among them, the universal coating 101 and the identifiable coating 102 can be sprayed separately or sprayed simultaneously in the same process; the spray pattern can be customized or left blank as required. The customized blank or pattern can avoid the top cover component area such as the identification code, positive and negative poles, explosion-proof valve, injection hole and sealing pins connected to the injection hole, while the identification code area is sprayed with the identifiable coating, and the transparency of the coating is controlled during spraying, which can not affect the identification of the code while playing a protective role; in addition, the applied spray material has reliable safety after curing.

[0032] Specifically, the outer surface of the battery cell housing body 201 is pretreated with laser or etching solution, and the pretreated outer surface is sprayed with opaque insulating material to form a universal coating 101. Similarly, the outer surface of the top cover plate 202, except for the top cover assembly area, is pretreated with laser or etching solution, and the pretreated outer surface is sprayed with opaque insulating material to form a universal coating 101. In this embodiment, the insulating material is formed by mixing acrylic material + UV curing inducer. The insulating material formed by this mixture is an existing material, and no new material / substance is produced during the mixing process. Since both materials are colorless, color paste (which does not react with the insulating material) can be added to this basis and adjusted to an opaque state to form an opaque insulating material. Of course, other existing opaque insulating materials can also be used, which are not specifically limited here. By forming a universal coating by spraying on the outer surface as described above, replacing the traditional blue film coating of the battery cell, it can reduce material input, reduce production costs, and improve manufacturing efficiency.

[0033] As another embodiment, the color of the sprayed insulating material can be adjusted according to product requirements. At the same time, the universal coating formed by spraying has a certain opacity, which makes it easy to automatically identify the product online during production and use, and prevents unqualified products such as missed spraying and over-spraying.

[0034] At the same time, a transparent insulating material is sprayed on the identification code 205 area on the outer surface of the top cover plate 202 to form an identifiable coating 102, wherein the identification code engraved on the battery cell shell can be a QR code, a digital code or other identification code, and each battery cell has a unique identification code to facilitate the rapid identification of the battery cell; the transparent insulating material used in this embodiment is an acrylic material + UV curing inducer, and the color paste is added to adjust it to a transparent or translucent state, and its color is adjusted to a halo yellow, a solid color, etc., so that the status can be identified through the transparent insulating material. Of course, other existing transparent insulating materials can also be used, which is not specifically limited here. By spraying an identifiable coating on the identification code as described above, it replaces the traditional battery cell top cover plate protection patch, which can reduce material input, reduce production costs, and improve manufacturing efficiency.

[0035] As another embodiment, the color of the sprayed insulating material can be adjusted according to product requirements. At the same time, the identifiable coating formed by spraying has a certain transparency, so that the product can identify the QR code, digital code or other identification code during the application process, and does not affect the online automatic identification of the product during production and use, preventing the product from having unqualified phenomena such as missed spraying and over-spraying.

[0036] like Figure 2As shown, the outer surface of the cell housing serves as a coating attachment substrate 1013, supporting the coating and also providing the coating's primary protective area. This coating attachment substrate 1013 is roughened after pretreatment, forming at least one irregular void-like structure on the outer surface. Similarly, the outer surface of the top cover plate, excluding the top cover assembly area, also serves as a coating attachment substrate 1013. This is roughened after pretreatment, forming at least one irregular void-like structure on the outer surface. Based on this, the universal coating is divided into a bonding area 1012 and a coating area 1011. The bonding area 1012 is the area where the coating and the coating attachment substrate are bonded. The sprayed material in the bonding area fills each irregular void-like structure, ensuring that the coating adheres tightly to the product surface and provides reliable adhesion. In this manner, the sprayed surface is first roughened through pretreatment (pretreatment methods include, but are not limited to, laser pretreatment, corrosive liquid pretreatment, etc.). The sprayed material then fills the roughened voids in the bonding area, enhancing the coating's bonding strength. On this basis, the coating area 1011 is the main body of the coating, and the coating area is coated on the entire bonding area 1012 and the coating attachment base 1013. The coating area can protect the battery cell, and the attachment area isolates the battery cell from the outside world. The spray thickness of the coating area is greater than 30μm and less than 160μm, so that the battery cell has good insulation resistance and protection effect, and will not cause waste of space and materials due to excessive thickness of the coating.

[0037] Example 2

[0038] The utility model provides a lithium-ion battery, comprising a cell shell with an insulating coating and a bare cell as described in the first embodiment, wherein the bare cell is fixedly installed inside the cell shell.

[0039] The utility model proposes a battery cell shell and lithium-ion battery with an insulating coating. By means of inkjet coating, an insulating material with a certain transparency and color is sprayed on the engraved area, and an insulating material with a certain opacity and color is sprayed on other feasible areas of the battery cell shell, so that a safe and reliable colloid coating is attached to the outside of the battery cell shell, which reduces space waste, reduces organizational costs, improves production efficiency, improves the safety and reliability of the battery cell, and makes it easy to automatically identify the sprayed product online during production and use, preventing unqualified products such as missed spraying and over-spraying. At the same time, the coating attachment substrate is pre-treated with laser or corrosive liquid to roughen the surface, and a large number of irregular void structures are formed on the roughened outer surface. Each irregular void structure is filled with spray material to form a bonding area between the coating and the surface of the battery cell shell, and a covering coating area is sprayed on the bonding area and the coating attachment substrate. In this way, the coating can be tightly attached to the product surface, effectively enhancing the bonding strength.

[0040] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A battery cell shell with an insulating coating, characterized in that: The battery cell housing comprises a body and a top cover plate. The battery cell housing is an accommodating cavity with one end open for accommodating bare batteries. The top cover plate is fixed to the open end of the accommodating cavity and is sealed in the accommodating cavity. The top cover plate is provided with a top cover assembly, which includes positive and negative poles, an explosion-proof valve, an identification code, a liquid injection hole, and a sealing nail connected to the liquid injection hole. The outer surface of the battery cell shell body is coated with a universal coating, the outer surface of the top cover plate except the top cover component area is coated with a universal coating, and the identification code area on the outer surface of the top cover plate is coated with an identifiable coating, the universal coating is an opaque coating, and the identifiable coating is a transparent coating.

2. A battery cell shell with an insulating coating as claimed in claim 1, characterized in that: The outer surface of the battery cell shell body is pretreated by laser or corrosive liquid, and the pretreated outer surface is sprayed with opaque insulating material to form a universal coating.

3. The battery cell shell with an insulating coating according to claim 1, characterized in that: The outer surface of the top cover plate except the top cover component area is pretreated by laser or etching liquid, and the pretreated outer surface is sprayed with opaque insulating material to form a universal coating.

4. The battery cell shell with an insulating coating according to claim 1, characterized in that: The identification code area on the outer surface of the top cover plate is sprayed with a transparent insulating material to form an identifiable coating.

5. The battery cell casing with an insulating coating as claimed in claim 2, characterized in that: The outer surface of the battery cell shell body serves as a coating attachment substrate, is roughened after pretreatment, and at least one void-shaped structure is formed on the outer surface.

6. A battery cell casing with an insulating coating as claimed in claim 3, characterized in that: The outer surface of the top cover plate, except for the top cover component area, serves as a coating attachment substrate and is roughened after pretreatment, and at least one void-shaped structure is formed on the outer surface.

7. A battery cell casing with an insulating coating as claimed in claim 5 or 6, characterized in that: The universal coating comprises a bonding area and a coating area, wherein the bonding area is an area where the coating and the coating attachment substrate are bonded, and each void-shaped structure in the bonding area is filled with sprayed material.

8. A battery cell casing with an insulating coating as claimed in claim 7, characterized in that: The coating area is the coating body, and the coating area is coated and covered on the entire bonding area and the coating attachment substrate.

9. A battery cell casing with an insulating coating as claimed in claim 8, characterized in that: The spraying thickness of the coating area is greater than 30 and less than 160 .

10. A lithium ion battery, characterized in that: It comprises a battery cell shell with an insulating coating and a bare battery cell as described in any one of claims 1 to 9, wherein the bare battery cell is fixedly installed inside the battery cell shell.

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