CN217387329U

CN217387329U - Lithium ion battery and electronic product thereof

Info

Publication number: CN217387329U
Application number: CN202220127397.0U
Authority: CN
Inventors: 王强; 安建; 金柱�; 涂贤能; 吕庆文; 何珊珊; 于子龙; 陈杰; 杨山
Original assignee: Huizhou Liwinon Energy Technology Co Ltd
Current assignee: Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-09-06
Anticipated expiration: 2032-01-18

Abstract

The utility model belongs to the technical field of the battery, specifically disclose a lithium ion battery and electronic product thereof, lithium ion battery includes electric core, structure and casing, the structure laminating is in the surface of electric core just the structure accept in the casing. The utility model provides a pair of lithium ion battery increases the lifting surface area of electric core corner through the mode that adds the structure for the whole atress of electric core is even, guarantees that electric core inside can take place chemical reaction uniformly, thereby improves the interface difference, avoids electric core appearance to separate out lithium and purpura phenomenon.

Description

Lithium ion battery and electronic product thereof

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to lithium ion battery and electronic product thereof.

Background

Normal naked electric core size is less than the interior hole size of casing, and it can contract the inflation repeatedly to annotate liquid back electric core at charge-discharge in-process pole piece thickness, and the pole piece receives casing (plastic-aluminum membrane, square shell etc.) pressure and changes along with pole piece expansion and contraction repeatedly, disassembles electric core when full electricity, and the discovery appears appearing in electric core circular arc corner phenomenons such as separating lithium and purpura.

In the current cycle process of the winding structure battery cell, because different positions of the battery cell are subjected to different pressures of the shell, gaps are easy to occur between the diaphragm and the pole piece, the difference of interface reaction is large, along with the increase of cycle number, the differences are gradually accumulated, and finally the phenomena of local lithium precipitation of the battery cell or purple spots, black spots and the like occur, so that the capacity attenuation of the battery cell quickly reaches the termination condition.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: through providing a lithium ion battery, the atress area of electricity core corner is increased through the mode that adds the structure for the whole atress of electricity core is even, guarantees that electricity core inside can take place chemical reaction uniformly, thereby improves the interface difference, avoids electric core appearance to separate out lithium and purpura phenomenon.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a lithium ion battery comprises an electric core, a structural member and a shell, wherein the structural member is attached to the surface of the electric core and contained in the shell.

Furthermore, one side of the structural member, which is close to the battery core, is recessed inwards to form an arc-shaped groove, arc-shaped areas are arranged on two sides of the battery core, and the arc-shaped groove is matched with the arc-shaped areas of the battery core.

Furthermore, the number of the structural members is four, and the four structural members are respectively located in the arc-shaped area of the battery cell.

Further, the number of the structural members is two, and the two structural members are respectively attached to the arc-shaped area of the battery core.

Further, the shell is an aluminum-plastic film or a steel shell.

Further, the structural member and the shell are integrally formed.

Further, the cell is formed by winding or stacking a cathode sheet, a separator, and an anode sheet.

Furthermore, the structural part is made of PET soft glue.

An electronic product comprises the lithium ion battery.

The beneficial effects of the utility model reside in that: a lithium ion battery comprises a battery cell, a structural member and a shell, wherein the structural member is attached to the surface of the battery cell and contained in the shell. The utility model provides a pair of lithium ion battery increases the lifting surface area of electric core corner through the mode that adds the structure for the whole atress of electric core is even, guarantees that electric core inside can take place chemical reaction uniformly, thereby improves the interface difference, avoids electric core appearance to separate out lithium and purpura phenomenon.

Drawings

Fig. 1 is a schematic structural diagram of a lithium ion battery in an embodiment.

Wherein: 1. an electric core; 2. a structural member; 3. a housing.

Detailed Description

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

In order to make the technical solutions and advantages of the present invention clearer, the present invention and its advantageous effects will be described in further detail below with reference to the accompanying drawings of the detailed description and the specification, but the present invention is not limited thereto.

As shown in fig. 1, the lithium ion battery provided in the present embodiment includes a battery cell 1, a structural member 2, and a casing 3, where the structural member 2 is attached to a surface of the battery cell 1, and the structural member 2 is accommodated in the casing. Wherein, electric core 1 is by the negative pole piece, diaphragm and positive pole piece are through coiling or piling up and forming, in the battery charging process, structure 2 extrudes electric core 1 and casing 3, make the negative pole piece, the diaphragm, the laminating of positive pole piece is inseparable, improved the situation that leads to the electrochemistry difference because of the uneven atress of electric core 1 pole piece, avoid electric core 1 to appear separating lithium, phenomenons such as purpura or black spot, and simultaneously, it can not increase electric core 1's thickness, can guarantee that the volume energy density and the quality energy density of battery accord with the production requirement, it increases the lifting surface area of electric core 1 corner through the mode of adding structure 2, make electric core 1 whole atress even, guarantee that electric core 1 is inside can take place chemical reaction uniformly, thereby improve the interface difference, avoid electric core 1 to appear separating lithium and purpura phenomenon.

Preferably, one side of the structural member 2 close to the battery cell 1 is recessed inwards to form an arc-shaped groove, two sides of the battery cell 1 are provided with arc-shaped areas, and the arc-shaped groove is matched with the arc-shaped areas of the battery cell 1. This kind of structural design for electric core 1 can be partly established in the arc recess, has strengthened structural component 2 and electric core 1's fastness to connection, and compact structure can guarantee that structural component 2 closely laminates in the corner of electric core 1.

Preferably, four structural members 2 are provided, and the four structural members 2 are respectively located at the arc-shaped area of the battery cell 1. This kind of structural design can make 1 whole atress of electric core even, improved because 1 pole piece atress of electric core uneven situation that leads to the electrochemistry difference, avoid electric core 1 to appear separating the phenomenon such as lithium, purpura or black spot, in another kind of embodiment, structure 2 is provided with two, two structures 2 laminate respectively in the arc region of electric core 1, it is to explain that, the quantity and the mode of setting up of structure are not limited to these two kinds listed in this concrete embodiment, technical personnel in the art can be according to actual production needs, still can set up the structure into 5, 6, 7, 8, 9, 10 etc. do not deviate the utility model discloses a various modifications can be made under the circumstances of spirit, this modification also should be contained within the scope of the utility model.

Preferably, the housing 3 is an aluminum plastic film or a steel shell. It should be noted that the lithium battery case 3 is not limited to the steel case and the aluminum plastic film listed in the present embodiment, and may be a case made of aluminum alloy or plastic.

Preferably, the structural member 2 is made of PET soft rubber, and has the characteristics of no reaction with electrolyte, solvent, additives and the like, good stability and soft rubber material.

The lithium ion battery provided by the specific embodiment has the following process flow:

1) manufacturing an electric core 1;

2) coating adhesive on the structural member 2;

3) attaching the structural part 2 to the corner of the battery core 1;

4) the battery core 1 and the structural part 2 are packaged in a shell;

it should be noted that, if the lithium ion battery is a square shell structure, the structural member 2 and the inner hole of the square shell may be bonded into a whole or directly manufactured by an integral molding process.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A lithium ion battery, characterized by: the battery cell structure comprises a battery cell (1), a structure (2) and a shell (3), wherein the structure (2) is attached to the surface of the battery cell (1), the structure (2) is contained in the shell (3), and the structure (2) and the shell (3) are integrally formed.

2. A lithium ion battery according to claim 1, wherein: one side of the structural component (2) close to the battery cell (1) is inwards recessed to form an arc-shaped groove, arc-shaped areas are arranged on two sides of the battery cell (1), and the arc-shaped groove is matched with the arc-shaped areas of the battery cell (1).

3. A lithium ion battery according to claim 2, wherein: the number of the structural members (2) is four, and the four structural members (2) are respectively located in the arc-shaped area of the battery cell (1).

4. A lithium ion battery according to claim 2, wherein: the battery cell structure is characterized in that two structural components (2) are arranged, and the two structural components (2) are respectively attached to the arc-shaped area of the battery cell (1).

5. A lithium ion battery according to claim 1, wherein: the shell (3) is an aluminum-plastic film or a steel shell.

6. A lithium ion battery according to claim 1, wherein: the battery core (1) is formed by winding or stacking a cathode sheet, a diaphragm and an anode sheet.

7. A lithium ion battery according to claim 1, wherein: the structural part (2) is made of PET soft glue.

8. An electronic product, comprising: the lithium ion battery according to any one of claims 1 to 7.