CN111384317A - A lithium-ion battery - Google Patents

Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery, comprising a casing assembly and a battery core assembly. The casing assembly includes a casing, a cover plate and a sealing member, and an opening of the casing protrudes outward. There is a brim, the brim is provided with an inward-facing accommodating groove, the sealing member covers the periphery of the cover plate, and the outer side of the sealing member is pressed against the inner wall of the accommodating groove; the battery core assembly is provided with Inside the casing, the battery core assembly is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug is connected to the cover plate, and the negative electrode lug is connected to the casing. The casing assembly of the lithium ion battery includes a casing, a cover plate and a sealing member. The structure of the cover plate and the sealing member is simple, which simplifies the structure and process of the lithium ion battery; and the outer side of the sealing member is pressed against the inner wall of the accommodating tank, That is, on the inner side of the brim, the sealing element is squeezed between the edge of the cover plate and the brim, so that the sealing performance of the entire shell assembly is relatively high.

Description

A lithium-ion battery

technical field

The present invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery.

Background technique

With the development of in-ear Bluetooth headsets, button batteries have become more and more widely used, and most of them are on electronic devices close to sensitive parts of the body. Chinese invention patent CN201080007121.9 discloses a button battery and a method for producing the button battery. The button battery includes a first metal cup, a second metal cup and an insulating seal. The first metal cup is inserted into the second metal cup, A part of the insulating seal covers the opening of the first metal cup, and the other part is arranged between the outer wall of the first metal cup and the inner wall of the second metal cup. An electrode sheet is arranged inside the first metal cup. Furthermore, the bottom edge of the first metal cup needs to be provided with a chamfer, and the opening of the second metal cup needs to be folded inward to fix the first metal cup and the insulating seal inside the second metal cup. The button battery has a complicated structure and high manufacturing cost.

Therefore, there is an urgent need for a lithium-ion battery to solve the above technical problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a lithium ion battery with a relatively simple structure and high sealing performance.

For this purpose, the present invention adopts the following technical solutions:

A lithium-ion battery is provided, comprising:

The casing assembly includes a casing, a cover plate and a sealing member, the opening of the casing is provided with a brim protruding outward, the brim is provided with a receiving groove with an opening facing inward, and the sealing member covers the the periphery of the cover plate, the outer side of the seal is pressed against the inner wall of the accommodating groove;

The battery core assembly is arranged in the casing, the battery core assembly is provided with a positive electrode lug and a negative electrode lug, the positive electrode lug is connected to the cover plate, and the negative electrode lug is connected to the casing.

As a preferred technical solution of a lithium ion battery, the cell assembly includes a positive electrode sheet and a negative electrode sheet arranged in layers, separators are provided on both sides of the positive electrode sheet or the negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are provided with separators. The negative electrode sheet is wound into a disc shape to form the battery core assembly, the positive electrode tab is drawn out from the positive electrode sheet, and the negative electrode tab is drawn out from the negative electrode sheet.

As a preferred technical solution of a lithium-ion battery, the battery core assembly includes a plurality of cross-layered positive electrode sheets and negative electrode sheets, one negative electrode sheet is arranged between two adjacent positive electrode sheets, and two adjacent positive electrode sheets are provided with one negative electrode sheet. A positive electrode piece is arranged between each of the negative electrode pieces, a separator is arranged between the positive electrode piece and the negative electrode piece, and the separator is arranged on the outer sides of the pole pieces on the upper and lower surfaces of the cell assembly ;

All the positive electrodes are connected in parallel, and the positive tabs are drawn out; all the negative tabs are connected in parallel, and the negative tabs are drawn out.

As a preferred technical solution for a lithium-ion battery, the material of the sealing member is plastic.

The beneficial effects of the invention are as follows: the casing assembly of the lithium ion battery includes a casing, a cover plate and a sealing member, and the structure of the cover plate and the sealing member is simple, which simplifies the structure and process of the lithium ion battery; and the outer side of the sealing member is pressed against On the inner wall of the accommodating groove, that is, the inner side of the brim, the sealing element is squeezed between the edge of the cover plate and the brim, so that the sealing performance of the entire shell assembly is relatively high.

Description of drawings

Fig. 1 is the structural representation of the lithium ion battery provided by the present invention;

2 is a cross-sectional view of a lithium-ion battery provided by the present invention (the cell assembly is in a disc shape);

FIG. 3 is a cross-sectional view of a lithium ion battery provided by the present invention (a positive electrode sheet and a negative electrode sheet are laminated).

In the figure: 1, housing assembly; 11, housing; 111, brim; 1111, accommodating groove; 12, cover plate; 13, seal;

2. Cell assembly; 21. Positive electrode ear; 22. Negative electrode ear; 23. Positive electrode sheet; 24. Negative electrode sheet; 25. Diaphragm.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed when it is used. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the device referred to. Or elements must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, or Integrally connected; either mechanical or electrical. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

As shown in FIG. 1 , this embodiment discloses a lithium-ion battery, which includes a case assembly 1 and a cell assembly 2 .

The casing assembly 1 includes a casing 11 , a cover plate 12 and a sealing member 13 , and the materials of the casing 11 and the cover plate 12 are stainless steel. The casing 11 is in the shape of a cup, and the cover plate 12 is in the shape of a disc.

The opening of the casing 11 is provided with a brim 111 protruding outward, and the brim 111 is provided with a accommodating groove 1111 with an opening facing inward. the inner wall. The sealing member 13 is in the shape of a circular ring, and the inner wall is provided with a groove. The sealing member 13 is sleeved on the cover plate 12 so that the periphery of the cover plate 12 extends into the groove. Moreover, there is an interference fit between the sealing member 13 and the cover plate 12 . In order to ensure the tightness between the two, a sealant is coated on the periphery of the cover plate 12 and/or in the groove of the sealing member 13 . The outer side surface of the sealing member 13 and the parts of the upper and lower surfaces that are close to the outer side surfaces are pressed against the inner wall of the accommodating groove 1111 . In order to ensure the tightness between the sealing member 13 and the brim 111 , a sealant is coated on the outer periphery of the sealing member 13 and/or the inner wall of the accommodating groove 1111 . The material of the sealing member 13 is a plastic that is resistant to corrosion by the electrolyte, preferably PP material in this embodiment.

The packaging process of the cover plate 12: the shell 11 is initially processed into a stepped shape, the outer diameter of the opening is relatively large, and the brim 111 is a large-diameter section; after the battery core assembly 2 in the shell 11 is installed, the assembled cover The plate 12 and the sealing member 13 are placed in the large aperture section; then the edge of the opening of the casing 11 is rolled to bend it inward by 45°, and the cover plate 12 and the sealing member 13 are preliminarily fixed; The bent portion continues to be rolled downward to make it parallel to the bottom surface of the casing 11 , so that a receiving groove 1111 is formed at the brim 111 , and the cover plate 12 and the sealing member 13 are assembled in the receiving groove 1111 of the casing 11 . .

The casing assembly 1 of the lithium ion battery includes a casing 11, a cover plate 12 and a sealing member 13. The structure of the cover plate 12 and the sealing member 13 is simple, which simplifies the structure and process of the lithium ion battery; Pressed against the inner wall of the accommodating groove 1111 , that is, the inner side of the brim 111 , the sealing member 13 is squeezed between the edge of the cover plate 12 and the brim 111 , so that the sealing performance of the entire housing assembly 1 is relatively high.

The battery core assembly 2 is arranged in the casing 11 , and the battery core assembly 2 is provided with a positive electrode lug 21 and a negative electrode lug 22 , the positive electrode lug 21 is mechanically and electrically connected to the cover plate 12 , and the negative electrode lug 22 is mechanically and electrically connected to the casing 11 . .

As shown in FIG. 2 , preferably, in this embodiment, the battery core assembly 2 includes a positive electrode sheet 23 and a negative electrode sheet 24 arranged in layers, and the positive electrode sheet 23 and the negative electrode sheet 24 are both elongated. Diaphragms 25 (black films) are provided on both sides of the positive electrode sheet 23 or the negative electrode sheet 24. In this embodiment, separators 25 are provided on both sides of the negative electrode sheet 24, and the positive electrode sheet 23 and the negative electrode sheet 24 are wound into a disc shape The battery core assembly 2 is formed, the positive electrode tab 21 is drawn out from the positive electrode sheet 23 , and the negative electrode tab 22 is drawn out from the negative electrode sheet 24 .

As shown in FIG. 3 , in other embodiments, the cell assembly 2 includes a plurality of positive electrode sheets 23 and negative electrode sheets 24 that are arranged in a cross-laminated arrangement. are the same shape and match in size. A negative electrode sheet 24 is provided between two adjacent positive electrode sheets 23 , a positive electrode sheet 23 is provided between two adjacent negative electrode sheets 24 , between the positive electrode sheet 23 and the negative electrode sheet 24 and the upper and lower two of the cell assembly 2 . Diaphragms 25 are provided on the outer sides of the pole pieces on the surface. All the positive electrodes 23 are connected in parallel, and the positive tabs 21 are drawn out; all the negative tabs 24 are connected in parallel, and the negative tabs 22 are drawn out.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (4)

1. A lithium ion battery, comprising:

the shell assembly (1) comprises a shell (11), a cover plate (12) and a sealing element (13), wherein an opening of the shell (11) is outwards and convexly provided with a cap peak (111), the cap peak (111) is provided with an accommodating groove (1111) with an inward opening, the sealing element (13) is wrapped on the periphery of the cover plate (12), and the outer side of the sealing element (13) is pressed against the inner wall of the accommodating groove (1111);

the battery pack (2) is arranged in the shell (11), the battery pack (2) is provided with a positive tab (21) and a negative tab (22), the positive tab (21) is connected to the cover plate (12), and the negative tab (22) is connected to the shell (11).

2. The lithium ion battery according to claim 1, wherein the battery assembly (2) comprises a positive plate (23) and a negative plate (24) which are arranged in a stacked manner, a separator (25) is arranged on each of two sides of the positive plate (23) or the negative plate (24), the positive plate (23) and the negative plate (24) are wound into a disc shape to form the battery assembly (2), the positive tab (21) is led out from the positive plate (23), and the negative tab (22) is led out from the negative plate (24).

3. The lithium ion battery according to claim 1, wherein the battery module (2) comprises a plurality of positive plates (23) and negative plates (24) which are arranged in a cross-laminated manner, one negative plate (24) is arranged between two adjacent positive plates (23), one positive plate (23) is arranged between two adjacent negative plates (24), a separator (25) is arranged between the positive plates (23) and the negative plates (24), and the separator (25) is arranged on the outer side of the pole piece on the upper surface and the outer side of the pole piece on the lower surface of the battery module (2);

all the positive plates (23) are connected in parallel, and the positive lugs (21) are led out; all the negative plates (24) are connected in parallel, and the negative tabs (22) are led out.

4. The lithium ion battery according to claim 1, wherein the material of the sealing member (13) is plastic.

Images