CN219267719U

CN219267719U - Battery cell and lithium ion battery

Info

Publication number: CN219267719U
Application number: CN202320076438.2U
Authority: CN
Inventors: 周永涛; 闫小舍; 杨允杰
Original assignee: Huading Guolian Sichuan Power Battery Co ltd
Current assignee: Huading Guolian Sichuan Power Battery Co ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-06-27
Anticipated expiration: 2033-01-10

Abstract

The utility model provides a battery cell and a lithium ion battery, and belongs to the technical field of lithium ion batteries. According to the utility model, the welding printing areas in the first space and the second space are covered by the first functional area glue coating and the second functional area glue coating, so that the problem of short circuit or liquid leakage caused by damage of metal scraps remained in the welding printing areas to an aluminum-plastic film is prevented; meanwhile, the glue coating plays a certain role in fixing the welding area, and the welding crack problem can be prevented when the battery core is transported or the electrode lug is connected with other structures.

Description

Battery cell and lithium ion battery

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to an electric core and a lithium ion battery.

Background

The flexible package lithium ion battery has a simple structure, and the battery cell unit mainly comprises a core package, an outer package (commonly used aluminum plastic film material) and a tab. And (3) pre-welding the blank area of the core pack, and correspondingly welding the blank area with the positive electrode lug or the negative electrode lug, so that the core pack is connected with the electrode lug. And (3) carrying out flat pressing shaping on the tab after welding, pasting glue on the welding and printing position, and covering and protecting the welding and printing position by using the protective glue to prevent short circuit. The tab generally comprises a metal strap and a film on a composition structure, the positive tab is generally an aluminum tab, the negative tab is generally a nickel material or a copper nickel plating material, the film is an insulated part on the tab, short circuit between the metal strap and an aluminum plastic film is prevented when the battery is packaged, and the metal strap and the aluminum plastic film are sealed and bonded together by heating and hot melting to prevent liquid leakage when the battery is packaged. The battery module is formed by connecting a plurality of battery core monomers in a serial-parallel connection mode, and the electrode lugs are used for being connected with an external structure or adjacent battery core monomers.

In order to improve the energy density of the battery core, the battery core is smaller in size and weight as much as possible in design, and the battery core comprises a blank area for shortening a core package, however, in the actual production process, after the blank area for shortening the core package is welded with a tab, the problem of welding crack easily occurs when tab pulling conditions exist in battery core transportation, tab connection with other structures and the like, and then the safety of tab overcurrent and battery core monomers is affected.

Disclosure of Invention

Aiming at the problems in the prior art, the utility model provides a battery cell and a lithium ion battery, which are used for solving the problem that the existing lithium ion battery is easy to crack.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the utility model provides a battery cell, which comprises a battery cell body, wherein the battery cell body comprises a first space which is wrapped by an aluminum plastic film and is formed by a welding printing area and a diaphragm area of a positive electrode lug side uncovered pole piece, and a second space which is wrapped by the aluminum plastic film and is formed by a negative electrode lug side uncovered pole piece and a welding printing area, a first functional area gluing is arranged in the first space, and a second functional area gluing is arranged in the second space.

Further, the size of the glue applied to the first functional area is equal to the size of the first space.

Further, the size of the second functional area glue is equal to the size of the second space.

Further, the first functional area is glued and positioned between two surfaces of the welding area on the positive tab side in the thickness direction and the diaphragm area of the electrode piece which is not covered on the positive tab side.

Further, the second functional area is glued on two surfaces in the thickness direction from the diaphragm area of the negative electrode lug side uncovered pole piece to the welding area of the negative electrode lug side.

In a second aspect, the present utility model provides a lithium ion battery comprising the cell of any one of the first aspects.

The beneficial effects of the utility model are as follows: the battery cell comprises a first space and a second space, wherein the first space is wrapped by an aluminum plastic film and is formed by a welding printing area and a diaphragm area, the diaphragm area is not covered by a positive electrode lug side, the diaphragm area is wrapped by the aluminum plastic film and is not covered by a negative electrode lug side, the second space is formed by a welding printing area, a first functional area gluing is arranged in the first space, and a second functional area gluing is arranged in the second space. When the method is applied to a lithium ion battery, after glue is injected into a first space and a second space, glue is respectively applied to a first functional area and a second functional area, and a welding printing area in the first space and the second space is wrapped by the glue, so that the problem of short circuit or liquid leakage caused by damage of residual metal scraps in the welding printing area to an aluminum plastic film is prevented; meanwhile, the glue coating plays a certain role in fixing the welding area, and the welding crack problem can be prevented when the battery core is transported or the electrode lug is connected with other structures.

Drawings

Fig. 1 is a top view of a battery cell provided by the present utility model;

FIG. 2 is a schematic view of a tab according to the present utility model;

FIG. 3 is a schematic cross-sectional view of a cell provided by the present utility model;

the lithium ion battery comprises a 1-positive electrode lug, a 2-battery core body, a 3-negative electrode lug, a 4-welding printing area, a 5-metal belt, a 6-electrode lug adhesive, a 7-first space, an 8-second space and a 9-aluminum plastic film.

Detailed Description

The thickness direction of the battery cell is defined as up and down, the length direction is defined as left and right, the positive electrode lug side is defined as left, the negative electrode lug side is defined as right, a space from a welding printing area to the leftmost side, namely, a diaphragm area of the positive electrode lug side, which is not covered by a pole piece, which is wrapped by an aluminum plastic film is defined as a first space, and a space from the rightmost diaphragm area, which is not covered by the pole piece, to the welding printing area, which is wrapped by the aluminum plastic film is defined as a second space. The definition is only for convenience of the following description of the technical scheme of the present utility model.

The embodiment of the utility model solves the problem that the existing lithium ion battery is easy to crack by providing the battery core and the lithium ion battery.

In the embodiment of the application, in order to solve the technical problems, the overall thought is as follows:

in an embodiment of the application, as shown in fig. 1-3, a battery cell and a lithium ion battery containing the battery cell are provided, the battery cell comprises a battery cell body 2, the battery cell body 2 comprises a first space 7 which is wrapped by an aluminum plastic film 9 and is formed by a welding printing area 4 to a diaphragm area of a positive electrode lug 1 side uncovered pole piece, and a second space 8 which is wrapped by the aluminum plastic film 9 and is formed by a diaphragm area of a negative electrode lug 3 side uncovered pole piece to the welding printing area 4, a first functional area gluing is arranged in the first space 7, and a second functional area gluing is arranged in the second space 8. The size of the first functional area glue is equal to that of the first space 7, the size of the second functional area glue is equal to that of the second space 8, and the first functional area glue is positioned on the upper surface and the lower surface of the welding area 4 on the side of the positive electrode lug 1 to the diaphragm area of the left uncovered pole piece; the second functional area gluing is positioned on the upper surface and the lower surface of the diaphragm area of the electrode piece, which is not covered on the side of the negative electrode lug 3, to the right welding printing area 4, the size of the first functional area gluing depends on the size of the first space 7, and the size of the second functional area gluing depends on the size of the second space 8. The battery cell is obtained through a conventional lamination or winding mode and comprises a positive plate, a negative plate and a diaphragm. The tab is a tab commonly available in the market and comprises a metal belt 5 and a film. The first functional area gluing agent and the second functional area gluing agent comprise one or a mixture of a plurality of polyolefin and copolymers thereof, polyformaldehyde, polyamide, polyacrylic acid, polyvinyl chloride, nylon, acrylonitrile-butadiene-styrene, polyurethane, polyether, phenolic resin, melamine formaldehyde, epoxy resin, polyester, organosilicon, silica gel, polymer electrolyte and inorganic ceramic electrolyte. The cathode lug 1 is made of aluminum, and the anode lug 3 is made of nickel or copper nickel plating.

When the adhesive is applied to a lithium ion battery, after the adhesive is injected into the first space 7 and the second space 8, the adhesive of the first functional area and the adhesive of the second functional area are respectively obtained, and the adhesive is used for wrapping the welding area 4 positioned in the first space 7 and the second space 8, so that the problem of short circuit or liquid leakage caused by damage of residual metal scraps in the welding area 4 to the aluminum-plastic film 9 is prevented; meanwhile, the gluing plays a certain role in fixing the solder printing area 4, and the problem of solder cracking can be prevented when the battery cell is transported or the electrode lug is connected with other structures.

In specific implementation, the specific steps are as follows:

1) Homogenizing, coating, rolling, slitting, die cutting, baking, laminating and pre-welding according to a conventional process to obtain a lithium ion battery core package;

2) The process for producing the first functional area glue and the second functional area glue is not described in detail herein, and can be prepared with reference to the production process of the plastic and the solid electrolyte;

3) The positive electrode lug 1 and the negative electrode lug 3 are correspondingly welded in a lug side blank area of the core pack, the welding area is subjected to flat pressing shaping, glue is injected in an injection or extrusion mode, and then the core pack is packaged in a shell;

4) And (3) performing top side sealing, baking, liquid injection, packaging and formation to fix the volume according to a conventional process to obtain the lithium ion battery.

In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.

Examples

The embodiment provides a battery cell and a lithium ion battery comprising the battery cell, as shown in fig. 1-3, the battery cell comprises a battery cell body 2, the battery cell body 2 comprises a first space 7 which is wrapped by an aluminum plastic film 9 and is formed by a welding printing area 4 to a diaphragm area of a positive electrode lug 1 side uncovered pole piece, and a second space 8 which is wrapped by the aluminum plastic film 9 and is formed by a diaphragm area of a negative electrode lug 3 side uncovered pole piece to the welding printing area 4, a first functional area gluing is arranged in the first space 7, and a second functional area gluing is arranged in the second space 8; the size of the first functional area gluing is equal to the size of the first space 7, the size of the second functional area gluing is equal to the size of the second space 8, the first functional area gluing is located between two surfaces of the positive electrode lug 1 side welding area 4 in the thickness direction and a diaphragm area of the positive electrode lug 1 side uncovered pole piece, and the second functional area gluing is located between two surfaces of the negative electrode lug 3 side uncovered pole piece diaphragm area and the negative electrode lug 3 side welding area 4 in the thickness direction.

In specific implementation, the specific steps are as follows:

2) Preparing a first functional area glue and a second functional area glue by referring to the production process of plastic and solid electrolyte;

3) The positive electrode lug 1 and the negative electrode lug 3 are correspondingly welded in a lug side blank area of the core pack, the welding area is subjected to flat pressing shaping, glue is injected in an injection or extrusion mode, then the core pack is packaged in a shell, and a lug glue 6 is formed at a welding position;

In summary, according to the battery cell and the lithium ion battery provided in the embodiments of the present application, after the glue is injected into the first space 7 and the second space 8, the glue of the first functional area and the glue of the second functional area are obtained respectively, and the glue wraps the welding area 4 located in the first space 7 and the second space 8, so that the problem of short circuit or liquid leakage caused by damage of the plastic-aluminum film 9 by the metal scraps remained in the welding area 4 is prevented; meanwhile, the gluing plays a certain role in fixing the solder printing area 4, and the problem of solder cracking can be prevented when the battery cell is transported or the electrode lug is connected with other structures.

It will be apparent to those skilled in the art that while preferred embodiments of the present utility model have been described, additional variations and modifications may be made to these embodiments once the basic inventive concepts are known to those skilled in the art. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model. It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Claims

1. The battery cell is characterized by comprising a battery cell body, wherein the battery cell body comprises a first space formed by a welding printing area, which is wrapped by an aluminum plastic film, to a diaphragm area, which is not covered by a positive electrode lug side, and a second space formed by a diaphragm area, which is wrapped by an aluminum plastic film, and is not covered by a negative electrode lug side, to the welding printing area, a first functional area gluing is arranged in the first space, and a second functional area gluing is arranged in the second space.

2. The cell of claim 1, wherein the size of the first functional area glue is equal to the size of the first space.

3. The cell of claim 1, wherein the second functional area is sized to be equal to the second space.

4. The cell of claim 1, wherein the first functional region is glued to a diaphragm region of the positive tab side uncovered pole piece from both surfaces in a thickness direction of the positive tab side welding region.

5. The cell of claim 1, wherein the second functional region glue is located on two surfaces in a thickness direction from a separator region of the negative electrode tab side uncovered electrode sheet to a welding region of the negative electrode tab side.

6. A lithium ion battery, characterized in that it comprises a cell according to any one of claims 1 to 5.