Cover plate assembly for lithium battery and lithium battery

Abstract

The utility model provides a cover plate assembly for a lithium battery and the lithium battery. The cover plate assembly for the lithium battery comprises a cover plate component which is provided with a mounting through hole and is made of plastic; the pole piece component penetrates through the mounting through hole, the pole piece component comprises a first pole piece, a limiting pole piece and a second pole piece which are sequentially connected and arranged at an included angle, the limiting pole piece is located in the mounting through hole and is in limiting fit with the mounting through hole, and the first pole piece and the second pole piece extend out of the two ends of the mounting through hole respectively; the sealing component is arranged between the inner wall of the mounting through hole and the pole piece component, and the sealing component is used for connecting the cover plate component and the pole piece component in a sealing manner. According to the technical scheme provided by the utility model, the problem of high production and assembly cost of the cover plate for the battery in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a cover plate assembly for a lithium battery and a lithium battery. Background Art

[0002] In the prior art, the pole structure on the battery cover generally includes an upper pole, a lower pole, a seal, and screws for fixing the upper pole and the lower pole on the cover. The above-mentioned pole structure is complex, resulting in complex processing and assembly, which leads to high production and assembly costs of the battery cover. Utility Model Content

[0003] The main purpose of the utility model is to provide a cover plate assembly for a lithium battery and a lithium battery, so as to solve the problem of high production and assembly costs of battery cover plates in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a cover plate assembly for a lithium battery, comprising: a cover plate component, a mounting through hole is provided on the cover plate component, and the cover plate component is made of plastic; a pole piece component is passed through the mounting through hole, the pole piece component comprises a first pole piece, a limiting pole piece and a second pole piece which are connected in sequence and arranged at an angle, the limiting pole piece is located in the mounting through hole and cooperates with the mounting through hole in a limiting manner, the first pole piece and the second pole piece extend out of the two ends of the mounting through hole respectively; a sealing component, a sealing component is provided between the inner wall of the mounting through hole and the pole piece component, and the sealing component is used to seal and connect the cover plate component and the pole piece component.

[0005] Furthermore, the sealing component includes an adhesive layer and a heat-resistant layer which are sequentially located on the outer periphery of the pole piece component.

[0006] Furthermore, at least two of the limiting pole piece, the first pole piece and the second pole piece are provided with a sealing component.

[0007] Furthermore, there are multiple pole piece components, half of the pole piece components among the multiple pole piece components are positive pole piece components, and the other half of the pole piece components among the multiple pole piece components are negative pole piece components.

[0008] Furthermore, the positive electrode sheet member is made of aluminum.

[0009] Furthermore, an oxide layer is provided on the surface of the positive electrode sheet component, the oxide layer covers the outer periphery of the positive electrode sheet component, and the oxide layer is located between the sealing component and the positive electrode sheet component.

[0010] Furthermore, the negative electrode sheet member is made of copper.

[0011] Furthermore, a nickel-plated layer is provided on the surface of the negative electrode sheet component, the nickel-plated layer covers the outer periphery of the negative electrode sheet component, and the nickel-plated layer is located between the sealing component and the negative electrode sheet component.

[0012] Furthermore, the heat-resistant layer is made of heat-resistant polypropylene material; and / or the adhesive layer is made of polypropylene material.

[0013] According to another aspect of the present invention, the present invention provides a lithium battery, including a housing, a battery cell disposed in the housing, and the above-mentioned lithium battery cover assembly covering the housing.

[0014] By applying the technical solution of the utility model, a limiting pole piece is provided which is located in the mounting through hole and cooperates with the mounting through hole to limit the pole piece component, so that the pole piece component can be limited and fixed to the cover plate component, and a sealing component is provided to achieve a sealed connection between the pole piece component and the cover plate component. In this way, the pole piece component can not only realize the function of the pole, but also simplify the structure of the cover plate assembly, facilitate manufacturing, and thus reduce production costs and assembly costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary 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. In the drawings:

[0016] Figure 1 A structural schematic diagram of an embodiment of a cover plate assembly for a lithium battery of the utility model is shown (wherein the cover plate component is not shown);

[0017] Figure 2 Shows Figure 1 A right side view of a cover plate assembly for a lithium battery;

[0018] Figure 3 Shows Figure 1 A schematic diagram of the assembly structure of a pole piece component and a sealing component of a cover plate assembly for a lithium battery;

[0019] Figure 4 Shows Figure 3 Front view of the pole piece component and the sealing component.

[0020] The above drawings include the following reference numerals:

[0021] 1. First pole piece; 2. Position limiting pole piece; 3. Second pole piece; 5. Sealing component; 51. Adhesive layer; 52. Heat-resistant layer. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] like Figures 1 to 3As shown, the utility model provides a cover plate assembly for lithium batteries. The cover plate assembly for lithium batteries includes a cover plate member, a pole piece member and a sealing member 5. Among them, the cover plate member is provided with a mounting through hole, and the cover plate member is made of plastic; the pole piece member is inserted into the mounting through hole, and the pole piece member includes a first pole piece 1, a limiting pole piece 2 and a second pole piece 3 that are sequentially connected and arranged at an angle, the limiting pole piece 2 is located in the mounting through hole and cooperates with the mounting through hole in a limiting manner, and the first pole piece 1 and the second pole piece 3 extend out of the two ends of the mounting through hole respectively; a sealing member 5 is provided between the inner wall of the mounting through hole and the pole piece member, and the sealing member 5 is used to seal and connect the cover plate member and the pole piece member.

[0024] In the above technical solution, by providing a limiting pole piece 2 located in the mounting through hole and cooperating with the mounting through hole, the pole piece component can be limited and fixed to the cover plate component, and by providing a sealing component, a sealed connection between the pole piece component and the cover plate component can be achieved. In this way, the pole piece component can not only realize the function of the pole, but also simplify the structure of the cover plate assembly, facilitate manufacturing, and thus reduce production costs and assembly costs.

[0025] Specifically, in the embodiment of the present invention, the cover plate component, the pole piece component and the sealing component 5 are integrally formed by injection molding.

[0026] Specifically, in the embodiment of the present invention, the thickness of the pole piece component is greater than or equal to 0.1 mm and less than or equal to 1 mm.

[0027] like Figure 3 and Figure 4 As shown, in the embodiment of the present invention, the sealing component 5 includes an adhesive layer 51 and a heat-resistant layer 52 which are sequentially located at the periphery of the pole piece component.

[0028] Through the above arrangement, on the one hand, during the high-temperature injection molding process, the heat-resistant layer 52 can ensure the airtightness between the pole piece component and the cover plate component, and on the other hand, the adhesive layer 51 can ensure the airtightness between the pole piece component and the heat-resistant layer 52, thereby achieving a sealed connection between the pole piece component and the cover plate component.

[0029] Specifically, in the embodiment of the present invention, the thickness of the heat-resistant layer 52 is greater than or equal to 0.1 mm and less than or equal to 0.2 mm. The thickness of the heat-resistant layer 52 is preferably 0.1 mm, 0.15 mm and 0.2 mm. In this way, it can be applied to the needs of different products.

[0030] Specifically, in the embodiment of the present invention, the heat-resistant layer 52 can be made of white glue or gray glue, and the number of layers of the heat-resistant layer 52 can be three or five.

[0031] Specifically, in the embodiment of the present invention, the adhesive layer 51 can be made of white glue or gray glue, and the number of layers of the adhesive layer 51 can be three or five.

[0032] Specifically, in the embodiment of the present invention, the thickness of the adhesive layer 51 is greater than or equal to 0.1 mm and less than or equal to 0.2 mm. The thickness of the adhesive layer 51 is preferably 0.1 mm, 0.15 mm and 0.2 mm. In this way, it can be applied to the needs of different products.

[0033] like Figure 2 As shown, in the embodiment of the present invention, at least two of the limiting pole piece 2, the first pole piece 1 and the second pole piece 3 are provided with a sealing member 5. In this way, a sealing connection between the pole piece member and the cover plate member can be better achieved.

[0034] Specifically, in the embodiment of the present invention, there are multiple pole piece components, half of the pole piece components among the multiple pole piece components are positive pole piece components, and the other half of the pole piece components among the multiple pole piece components are negative pole piece components.

[0035] Specifically, in the embodiment of the present invention, the positive electrode sheet component is made of aluminum material, and the aluminum material is preferably pure aluminum strip.

[0036] Preferably, in the embodiment of the present utility model, the chamfer of the pure aluminum strip may be R2, R3 or R5.

[0037] Specifically, in the embodiment of the present invention, an oxide layer is provided on the surface of the positive electrode sheet component, the oxide layer is coated on the outer periphery of the positive electrode sheet component, and the oxide layer is located between the sealing component 5 and the positive electrode sheet component. In this way, the corrosion resistance, insulation and surface adhesion of the positive electrode sheet component can be improved.

[0038] Preferably, in the embodiment of the present invention, the oxide layer can be formed by anodizing the surface of the aluminum material.

[0039] Specifically, in the embodiment of the present invention, the negative electrode sheet component is made of copper material, and the copper material is preferably oxygen-free copper strip.

[0040] Preferably, in the embodiment of the present invention, the chamfer of the oxygen-free copper strip may be R2, R3 or R5.

[0041] Specifically, in the embodiment of the present invention, a nickel-plated layer is provided on the surface of the negative electrode sheet component, the nickel-plated layer is coated on the outer periphery of the negative electrode sheet component, and the nickel-plated layer is located between the sealing component 5 and the negative electrode sheet component. In this way, the corrosion resistance and surface adhesion of the negative electrode sheet component can be improved.

[0042] Preferably, in the embodiment of the present invention, the nickel-plated layer can be formed by electroplating nickel on the surface of the oxygen-free copper strip.

[0043] Preferably, in the embodiment of the present invention, the heat-resistant layer 52 is made of heat-resistant polypropylene material, so that during the high-temperature injection molding process, the pole piece components can be prevented from being damaged by high temperature.

[0044] Preferably, in the embodiment of the present invention, the adhesive layer 51 is made of polypropylene material.

[0045] It should be noted that in the embodiment of the present utility model, the production process of the positive electrode sheet component and the negative electrode sheet component is as follows:

[0046] 1. Raw material preparation: positive electrode sheet components (using aluminum strip), negative electrode sheet components (using copper nickel-plated strip) and sealing components;

[0047] 2. Performing a pole piece component forming process: first performing a pre-pressing process, and then performing an internal heating process to form a finished product, wherein the internal heating process includes heating the pole piece component and pressing and forming;

[0048] 3. Chamfering process of pole piece components: chamfering the pole piece components;

[0049] 4. Perform detection and processing: Detection is performed by a CCD camera.

[0050] The embodiment of the utility model provides a lithium battery. The lithium battery comprises a housing, a battery cell disposed in the housing, and the above-mentioned lithium battery cover assembly disposed on the housing. The above-mentioned lithium battery has all the advantages of the above-mentioned lithium battery cover assembly, which will not be repeated here.

[0051] From the above description, it can be seen that the above-mentioned embodiments of the utility model achieve the following technical effects: by providing a limiting pole piece located in the mounting through hole and cooperating with the mounting through hole to limit the position, the pole piece component can be limited and fixed to the cover plate component, and by providing a sealing component, a sealed connection between the pole piece component and the cover plate component can be achieved. In this way, the pole piece component can not only realize the function of the pole, but also simplify the structure of the cover plate assembly, facilitate manufacturing, and thus reduce production costs and assembly costs.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cover plate assembly for a lithium battery, characterized in that: include: A cover plate component, wherein the cover plate component is provided with a mounting through hole and the cover plate component is made of plastic; A pole piece component is inserted into the mounting through hole, the pole piece component comprises a first pole piece (1), a limiting pole piece (2) and a second pole piece (3) which are connected in sequence and arranged at an angle, the limiting pole piece (2) is located in the mounting through hole and is limitedly matched with the mounting through hole, and the first pole piece (1) and the second pole piece (3) extend out of two ends of the mounting through hole respectively; A sealing component (5) is provided between the inner wall of the mounting through hole and the pole piece component, and the sealing component (5) is used to seal and connect the cover plate component and the pole piece component.

2. The cover plate assembly for a lithium battery according to claim 1, characterized in that: The sealing component (5) comprises an adhesive layer (51) and a heat-resistant layer (52) which are sequentially located on the outer periphery of the pole piece component.

3. The cover plate assembly for a lithium battery according to claim 1, characterized in that: At least two of the position-limiting pole piece (2), the first pole piece (1) and the second pole piece (3) are provided with the sealing component (5).

4. The cover plate assembly for a lithium battery according to claim 1, characterized in that: There are a plurality of electrode sheet components, half of which are positive electrode sheet components, and the other half of which are negative electrode sheet components.

5. The cover plate assembly for a lithium battery according to claim 4, characterized in that: The positive electrode sheet member is made of aluminum.

6. The cover plate assembly for a lithium battery according to claim 5, characterized in that: An oxide layer is provided on the surface of the positive electrode sheet component. The oxide layer covers the outer periphery of the positive electrode sheet component. The oxide layer is located between the sealing component (5) and the positive electrode sheet component.

7. The cover plate assembly for a lithium battery according to claim 4, characterized in that: The negative electrode sheet component is made of copper.

8. The cover plate assembly for a lithium battery according to claim 7, characterized in that: A nickel-plated layer is provided on the surface of the negative electrode sheet component. The nickel-plated layer covers the outer periphery of the negative electrode sheet component. The nickel-plated layer is located between the sealing component (5) and the negative electrode sheet component.

9. The cover plate assembly for a lithium battery according to claim 2, characterized in that: The heat-resistant layer (52) is made of heat-resistant polypropylene material; and / or, The adhesive layer (51) is made of polypropylene material.

10. A lithium battery, characterized in that: A lithium battery cover assembly according to any one of claims 1 to 9, comprising a shell, a battery cell arranged in the shell, and a cover plate assembly arranged on the shell.

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