CN214411290U

CN214411290U - Battery cell and battery and object with same

Info

Publication number: CN214411290U
Application number: CN202022364983.0U
Authority: CN
Inventors: 陈煜�; 王晓明; 朱继涛; 黄士斌; 俞云平
Original assignee: Jiangsu Zhuogao New Material Technology Co Ltd
Current assignee: Jiangsu Zhuogao New Material Technology Co Ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-10-15
Anticipated expiration: 2030-10-22

Abstract

The application discloses electric core and have its battery, object relates to secondary battery technical field. The battery cell comprises: the electrode assembly comprises a positive electrode piece, a diaphragm and a negative electrode piece, wherein the positive electrode piece, the diaphragm and the negative electrode piece are arranged in a laminated manner and then are wound together; the wound electrode assembly is placed in the aluminum-plastic film shell; the adhesive tape is n-shaped or u-shaped and spans the end parts of the electrode assembly and the aluminum-plastic film shell, and the adhesive tape is a hot melt adhesive tape. This application is through being n shape or u shape with the sticky tape and striding the tip of establishing at electrode subassembly and plastic-aluminum membrane shell, and the sticky tape is the hot melt sticky tape, carries out high temperature heating to it and can make the hot melt adhesive fuse with PP layer, the barrier film in the plastic-aluminum membrane and bond together to restraint diaphragm's removal, reduce the probability that falls in-process diaphragm and take place the internal contraction, improve the security performance of battery.

Description

Battery cell and battery and object with same

Technical Field

The application relates to the technical field of secondary batteries, in particular to an electric core and a battery and an object with the electric core.

Background

The lithium ion battery cell is generally manufactured by a winding or lamination process after positive and negative plates and a diaphragm are stacked together, and the positive and negative plates in the battery cell are separated by the diaphragm. The battery is inevitably dropped in the use process, the internal structure of the battery can be loosened by the impact caused by the dropping, and the diaphragm can be retracted. Because the diaphragm plays a role in isolating the positive and negative plates of the battery in the battery, the inward contraction and displacement of the diaphragm can cause the positive and negative plates of the battery to be contacted, so that short circuit is easy to occur, and even a fire phenomenon is caused.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an electric core, the inside diaphragm takes place the problem of the displacement of contracting when solving among the prior art electric core and falling.

In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions: a cell, comprising: the electrode assembly comprises a positive electrode piece, a diaphragm and a negative electrode piece, wherein the positive electrode piece, the diaphragm and the negative electrode piece are arranged in a laminated manner and then are wound together; the wound electrode assembly is placed in the aluminum-plastic film shell; the adhesive tape is n-shaped or u-shaped and spans the end parts of the electrode assembly and the aluminum-plastic film shell, and the adhesive tape is a hot melt adhesive tape.

In the technical scheme, the adhesive tape is n-shaped or u-shaped and spans the end parts of the electrode assembly and the aluminum-plastic film shell, is a hot melt adhesive tape, and can be fused and bonded with the PP layer and the isolating film in the aluminum-plastic film after being heated at high temperature, so that the movement of the diaphragm is restrained, the probability of the diaphragm shrinking inwards in the falling process is reduced, and the safety performance of the battery is improved.

Further, according to the embodiment of the application, the adhesive tape comprises a base material and an adhesive layer, wherein the adhesive layer is compounded on one side of the base material.

Further, according to the embodiments herein, wherein the substrate is PP or PET.

Further, according to the embodiment of the application, the width of the adhesive tape is 5-50 mm.

Further, according to the embodiment of the application, the thickness of the adhesive tape is 6-50 μm.

Further, according to the embodiment of the application, wherein the adhesive layer of the adhesive tape is made of a PUR hot melt adhesive, an EVA hot melt adhesive or a PE hot melt adhesive material.

In order to achieve the above object, an embodiment of the present application further discloses a battery having the battery cell as described above.

In order to achieve the purpose, the embodiment of the application also discloses an object which is provided with the battery.

Further, according to the embodiment of the application, the object is an electronic product or an electric vehicle.

Compared with the prior art, the method has the following beneficial effects: this application is through being n shape or u shape with the sticky tape and striding the tip of establishing at electrode subassembly and plastic-aluminum membrane shell, and the sticky tape is the hot melt sticky tape, carries out high temperature heating to it and can make the hot melt adhesive fuse with PP layer, the barrier film in the plastic-aluminum membrane and bond together to restraint diaphragm's removal, reduce the probability that falls in-process diaphragm and take place the internal contraction, improve the security performance of battery.

Drawings

The present application is further described below with reference to the drawings and examples.

Fig. 1 is a schematic structural diagram of a battery cell in the present application.

In the attached drawings

1. Electrode assembly 2, adhesive tape 3, and positive electrode tab

4. Negative pole tab

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments may be practiced without these specific details. In some instances, well-known methods and structures have not been described in detail so as not to unnecessarily obscure the embodiments. In addition, all embodiments may be used in combination with each other.

Fig. 1 is a specific structure of a battery cell in the present application. As shown in fig. 1, the battery core includes a motor assembly 1, an aluminum-plastic film shell, and an adhesive tape 2. The electrode assembly 1 comprises a positive electrode piece, a diaphragm and a negative electrode piece, the positive electrode piece, the diaphragm and the negative electrode piece are arranged in a stacked mode and then wound together, and a positive electrode tab 3 and a negative electrode tab 4 extend out of one end of the electrode assembly 1. The wound electrode assembly 1 is placed in an aluminum plastic case. On this basis, this application is through being n shape or u shape with sticky tape 2 and striding the tip of establishing at electrode subassembly 1 and plastic-aluminum membrane shell, and sticky tape 2 is hot melt adhesive tape, can make behind its high temperature heating the hot melt adhesive and the plastic-aluminum intramembranous PP layer, barrier film fuse the bonding together to restraint the removal of diaphragm, reduce the probability that falls in-process diaphragm and take place to contract, improve the security performance of battery.

In contrast, the adhesive tape 2 includes a base material and an adhesive layer, and the adhesive layer is combined on one side of the base material. The base material is preferably PP or PET material, and the right end of the sticking layer is PUR hot melt adhesive, EVA hot melt adhesive or PE hot melt adhesive material.

In addition, in order to ensure the adhesion of the tape 2, the tape preferably has a width of 5 to 50mm and a thickness of 6 to 50 μm.

Although the illustrative embodiments of the present application have been described above to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the embodiments, and various modifications within the spirit and scope of the present application defined and determined by the appended claims will be apparent to those skilled in the art from this disclosure.

Claims

1. A battery cell, comprising:

the electrode assembly comprises a positive electrode piece, a diaphragm and a negative electrode piece, and the positive electrode piece, the diaphragm and the negative electrode piece are arranged in a laminated mode and then wound together;

the wound electrode assembly is placed in the aluminum-plastic film shell;

the adhesive tape is n-shaped or u-shaped and spans the end parts of the electrode assembly and the aluminum plastic film shell, and the adhesive tape is a hot melt adhesive tape.

2. The battery cell of claim 1, wherein the adhesive tape comprises a substrate and an adhesive layer, and the adhesive layer is compounded on one side of the substrate.

3. The cell of claim 2, wherein the substrate is PP or PET.

4. The electrical core of claim 1, wherein the width of the adhesive tape is 5-50 mm.

5. The electrical core of claim 1, wherein the adhesive tape has a thickness of 6 to 50 μm.

6. A battery having a cell according to any of claims 1 to 5.

7. An object having a battery according to claim 6.

8. An object according to claim 7, characterized in that the object is an electronic product or an electric vehicle.