Cylindrical battery insulation spacer

Abstract

The utility model relates to a cylindrical battery insulation spacer which comprises a spacer base material made of non-woven fabric; the gasket coating is formed on at least one surface of the gasket base material, and the gasket coating is made of ceramic, boehmite or glass fiber reinforced PPS (Polyphenylene Sulfide). Therefore, the hardness and the supporting force of the gasket can be enhanced, and the gasket has good mechanical strength and is not prone to deformation at high temperature. Meanwhile, the gasket can have good liquid retention property, and when the battery is subjected to high-current discharge, the electrolyte remained in the composite gasket can release electrolyte to the current collector, so that the problem of lithium precipitation of the current collector is avoided; and the electrolyte permeability of the insulating spacer is higher than that of a conventional insulating spacer.

Description

Technical Field

[0001] The utility model belongs to the technical field of power battery parts and relates to an insulating gasket, in particular to a cylindrical battery insulating gasket. Background Art

[0002] The winding core of lithium-ion batteries (such as conventional cylindrical batteries) includes structures such as positive electrode sheets, negative electrode sheets and diaphragms, and an insulator is usually assembled inside. This is because the insulator can prevent the positive electrode sheet from contacting the positive electrode cover and the negative electrode sheet from contacting the negative electrode can to prevent short circuits inside the battery cell. Existing insulators are generally PET or PE insulating sheets with 1 to 10 holes. Such insulating sheets have poor air permeability and permeability, and have no liquid retention function. Therefore, holes are opened to solve the problem of electrolyte penetration; in addition, they have a low melting point, are easily deformed at high temperatures, and have poor mechanical strength, which poses a safety hazard.

[0003] The Chinese utility model patent with application number 201721872423.8 discloses a lithium-ion battery upper gasket (upper and lower gaskets), including an upper gasket body, the outer surface of which is coated with a coating made of a material with a preset flame-resistant material grade. The lithium-ion battery upper gasket has the characteristics of high temperature resistance and can withstand external extrusion force, which can effectively solve the safety problems caused by the upper gasket being affected by high temperature and external extrusion, and improve the overall safety performance of lithium-ion batteries. The application mainly coats the outer surface of the upper gasket body with epoxy resin material to form an outer coating, which improves the high temperature resistance to a certain extent, but there is still room for improvement. Utility Model Content

[0004] The utility model aims to provide a cylindrical battery insulating gasket to overcome the problems of the existing PE type insulating gaskets being not resistant to high temperatures and having poor air permeability and permeability.

[0005] In order to achieve the above object, the technical solution adopted by the utility model is: a cylindrical battery insulating gasket, which includes:

[0006] A gasket substrate, wherein the gasket substrate is made of non-woven fabric;

[0007] The gasket coating is formed on at least one surface of the gasket substrate and is made of ceramic, boehmite or glass fiber reinforced PPS.

[0008] Optimally, the gasket substrate and the gasket coating are bonded via a PVDF adhesive.

[0009] Furthermore, the non-woven fabric has a thickness of 0.01 to 2.00 mm and a specification of 10 to 400 meshes.

[0010] Optimally, the thickness of the gasket coating is 0.01 to 2.00 mm.

[0011] Furthermore, the grade of the glass fiber reinforced PPS is PPS-SG401 AT9.

[0012] Optimally, it also includes a through hole opened at the center of the gasket substrate and the gasket coating.

[0013] Optimally, the material of the gasket coating is ceramic or boehmite.

[0014] Optimally, the gasket coating is formed on both surfaces of the gasket substrate, and the materials thereof are the same or different.

[0015] Optimally, the gasket coating is formed on the surface of the gasket substrate by spraying or roller coating.

[0016] Optimally, it also includes a tab hole or a liquid absorption hole opened on and penetrating the gasket substrate and the gasket coating.

[0017] Due to the application of the above technical scheme, the utility model has the following advantages compared with the prior art: the cylindrical battery insulating gasket of the utility model forms a gasket coating on one surface or both surfaces of the gasket substrate, the gasket substrate adopts non-woven fabric, and the gasket coating adopts ceramic, boehmite or glass fiber reinforced PPS, which can enhance the hardness and supporting force of the gasket, so that the gasket has good mechanical strength and is not easy to deform at high temperature; at the same time, the gasket can have good liquid retention. When the battery is discharged with a large current, the electrolyte retained in the composite gasket can release electrolyte to the current collector, thereby avoiding the problem of lithium precipitation in the current collector; it also has excellent insulation performance, and the electrolyte permeability is higher than that of conventional insulating gaskets. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the cylindrical battery insulating gasket in Example 1;

[0020] Figure 2 It is a side view of the insulating gasket of the cylindrical battery in Example 1;

[0021] Figure 3 This is a disassembly diagram of the insulating gasket of the cylindrical battery in Example 1;

[0022] Figure 4 This is a schematic diagram of the structure of the cylindrical battery insulating gasket in Example 2;

[0023] Figure 5 It is a side view of the insulating gasket of a cylindrical battery in Example 2;

[0024] Figure 6 This is a disassembly diagram of the cylindrical battery insulation gasket in Example 2. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0028] Example 1

[0029] This embodiment provides a cylindrical battery insulating gasket, such as Figures 1 to 3 As shown, it includes a gasket substrate 1 and a gasket coating 2.

[0030] Among them, the gasket substrate 1 is a circular sheet structure (with two oppositely arranged surfaces), and its material is non-woven fabric. The lowest melting point of non-woven fabrics of different materials is usually greater than 150°C, which is higher than that of conventional insulating gaskets; in addition, non-woven fabrics have good corrosion resistance and are suitable for the inside of batteries; non-woven fabrics produced by different production processes can be selected according to the needs of the enterprise itself; non-woven fabric products with hydrophilic agents added can also be selected to make them liquid-retaining; the gap size of the non-woven fabric can be selected according to the actual needs of the cylindrical battery, but the preferred thickness is 0.01 to 2.00 mm and the specification is 10 to 400 meshes.

[0031] The gasket coating 2 is a layer, which is formed on any surface of the aforementioned gasket substrate 1, and its formation method can be conventional, such as being formed on the surface of the gasket substrate 1 by spraying or roller coating. In order to improve the bonding force and mechanical properties between the gasket coating 2 and the substrate 1, a PVDF adhesive can be provided between the gasket coating 2 and the gasket substrate 1 (such as pre-coating the PVDF adhesive on the surface of the gasket substrate 1), that is, the gasket substrate 1 and the gasket coating 2 are bonded by a PVDF adhesive (polyvinylidene fluoride adhesive). The thickness of the gasket coating 2 is preferably 0.01 to 2.00 mm.

[0032] In this embodiment, the material of the gasket coating 2 is ceramic, boehmite or glass fiber reinforced PPS (polyphenylene sulfide), that is, the gasket coating 2 is a ceramic layer, a boehmite layer or a glass fiber reinforced PPS layer, which enhances the hardness and support of the gasket, so that the gasket has good mechanical strength and is not easy to deform at high temperatures. Specifically, the ceramic layer can be made of ceramic powder (Al 2 O 3 ) is compacted, and its melting point is 2054°C. It has good thermal stability, wettability and liquid retention, good insulation performance, heat resistance and flame retardancy, good mechanical strength, and can effectively insulate. The boehmite layer can be obtained by compacting boehmite (molecular formula γ-AlOOH, hydrated alumina), with a decomposition temperature ≥400°C, very good thermal conductivity, good energy for heat conduction, excellent flame retardancy, and can improve the temperature resistance of the matrix. It has good liquid absorption and liquid retention, good mechanical strength, and can effectively insulate. Glass fiber reinforced PPS preferably adopts the grade PPS-SG401 AT9, which has low density, high toughness, excellent mechanical strength and processing performance, and has excellent heat resistance and chemical resistance, and good insulation performance. However, the material of the gasket coating 2 is preferably ceramic or boehmite, because they have good liquid retention performance and can reduce the phenomenon of lithium precipitation at the current collector (especially when the battery is discharged at a large current).

[0033] In this embodiment, the cylindrical battery insulating gasket also includes a through hole opened at the center of the gasket substrate 1 and the gasket coating 2. According to actual needs, a pole ear hole or a liquid absorption hole penetrating the gasket substrate 1 and the gasket coating 2 can be opened on the cylindrical battery insulating gasket.

[0034] Example 2

[0035] This embodiment provides a cylindrical battery insulating gasket, such as Figures 4 to 6As shown, it is basically the same as that in Example 1, except that: a gasket coating is formed on both surfaces of the gasket substrate 1, namely the first gasket coating 2-1 and the second gasket coating 2-2. The materials of the first gasket coating 2-1 and the second gasket coating 2-2 can be the same or different, and can be selected according to actual conditions. The double-coated gasket has better liquid retention, heat resistance and mechanical properties than the single-coated gasket in Example 1.

[0036] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A cylindrical battery insulating gasket, characterized in that: It includes: A gasket substrate, wherein the gasket substrate is made of non-woven fabric; The gasket coating is formed on at least one surface of the gasket substrate and is made of ceramic, boehmite or glass fiber reinforced PPS.

2. The cylindrical battery insulating gasket according to claim 1, characterized in that: The gasket substrate and the gasket coating are bonded by a PVDF adhesive.

3. The cylindrical battery insulating gasket according to claim 1 or 2, characterized in that: The nonwoven fabric has a thickness of 0.01-2.00 mm and a specification of 10-400 meshes.

4. The cylindrical battery insulating gasket according to claim 1, characterized in that: The thickness of the gasket coating is 0.01 to 2.00 mm.

5. The cylindrical battery insulating gasket according to claim 1, characterized in that: The utility model also includes a through hole opened at the center of the gasket substrate and the gasket coating.

6. The cylindrical battery insulating gasket according to claim 1, characterized in that: The material of the gasket coating is ceramic or boehmite.

7. The cylindrical battery insulating gasket according to claim 1, characterized in that: The gasket coating is formed on two surfaces of the gasket substrate and the materials thereof are the same or different.

8. The cylindrical battery insulating gasket according to claim 1, characterized in that: The gasket coating is formed on the surface of the gasket substrate by spraying or roller coating.

9. The cylindrical battery insulating gasket according to claim 1, characterized in that: It also includes a tab hole or a liquid absorption hole which is opened on and penetrates the gasket substrate and the gasket coating.

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