CN217788559U

CN217788559U - Single battery and battery module

Info

Publication number: CN217788559U
Application number: CN202123434728.XU
Authority: CN
Inventors: 刘舜; 李凯
Original assignee: Beijing Solid Core Energy Technology Co ltd
Current assignee: Beijing Solid Core Energy Technology Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-11-11
Anticipated expiration: 2031-12-30

Abstract

The utility model belongs to the technical field of the battery, a battery cell and battery module is related to, including battery case, encapsulation utmost point core and parcel in the battery case are in composite bed on battery case's the surface, the composite bed includes polyurea layer, buffer layer and the tie coat that outside-in set gradually, the tie coat cladding bonds on battery case's the surface. The utility model provides a single cell, a large amount of thermal runaway that compound anticollision layer can effectually avoid the puncture to lead to can only cause very little pinhole after the puncture, and the polyurea layer can absorb and disperse the effort for the polyurea layer is difficult to torn. The polyurea layer has adhesive force to the battery shell, so that the impact resistance of the single battery is improved, and the time of reaching the ignition point due to thermal runaway of the single battery can be effectively delayed.

Description

Single battery and battery module

Technical Field

The application belongs to the technical field of batteries and relates to a single battery and a battery module.

Background

The existing battery is generally a metal shell or a soft package aluminum shell battery, and when a battery module is punctured and the like, the punctured position of the battery is torn and exploded, so that a larger perforation is formed. Therefore, the shell and the pole core of a certain battery can easily enter the adjacent battery, and are in contact short circuit with the pole core of the adjacent battery, so that the battery is in thermal runaway, and the phenomena of smoke generation, even fire generation and explosion occur.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application will solve is: when taking place the puncture phenomenon to current battery module, can lead to the problem of battery thermal runaway, provide a battery cell and battery module.

In order to solve the technical problem, on one hand, the application provides a single battery. The single battery comprises a battery shell, a pole core packaged in the battery shell and a composite layer wrapped on the outer surface of the battery shell, wherein the composite layer comprises a polyurea layer, a buffer layer and a bonding layer which are sequentially arranged from outside to inside, and the bonding layer is wrapped and bonded on the outer surface of the battery shell.

Optionally, the buffer layer is wrapped around and bonded to the outer surface of the adhesive layer.

Optionally, the polyurea layer is coated on an outer surface of the cushioning layer.

Optionally, the buffer layer is made of flexible paint composed of butyl ester, xylene, cyclohexanone and an elastomer.

Optionally, the material of the bonding layer is composed of polyether, polyester, plasticizer and solvent.

Optionally, the single battery is in a flat cuboid shape;

the single battery is a soft package battery or a hard shell battery.

Optionally, a positive terminal and a negative terminal are led out from one side surface of the single battery in the length direction and are arranged at intervals;

the positive electrode terminal and the negative electrode terminal are sheet-shaped.

Optionally, the polyurea layer has a thickness of 0.3 to 3mm;

the thickness of the buffer layer is 0.2-2mm;

the thickness of the bonding layer is 0.1-1mm.

The embodiment of the application provides a battery cell, the composite bed parcel is in on battery case's the surface, the composite bed includes polyurea layer, buffer layer and the tie coat that outside-in set gradually, the tie coat cladding bonds on battery case's the surface. The utility model provides a single cell, a large amount of thermal runaway that compound anticollision layer can effectually avoid the puncture to lead to can only cause very little pinhole after the puncture, and the polyurea layer can absorb and disperse the effort for the polyurea layer is difficult to torn. The polyurea layer has adhesive force to the battery shell, so that the impact resistance of the single battery is improved, and the time of reaching the ignition point due to thermal runaway of the single battery can be effectively delayed.

On the other hand, this application embodiment still provides a battery module, and it includes module shell and a plurality of foretell battery cell, it is a plurality of battery cell stacks and sets up along its thickness direction in the module shell.

Optionally, the module housing includes a module housing body and a protective layer wrapped on an outer surface of the module housing body.

Optionally, the protective layer includes a polyurea layer, a buffer layer and a bonding layer that are sequentially disposed from outside to inside, and the bonding layer wraps and bonds on the outer surface of the module housing body.

Drawings

Fig. 1 is a schematic diagram of a single battery provided in an embodiment of the present application;

fig. 2 is another schematic diagram of a single battery provided in an embodiment of the present application;

fig. 3 is a top view of a single battery provided in an embodiment of the present application;

FIG. 4 isbase:Sub>A cross-sectional view taken at A-A of FIG. 3;

fig. 5 is a rear view of a single battery provided in an embodiment of the present application;

fig. 6 is a schematic diagram of a battery module according to an embodiment of the present disclosure.

The reference numerals in the specification are as follows:

100. a single battery;

1. a battery case;

2. a pole piece;

3. compounding layers; 31. a polyurea layer; 32. a buffer layer; 33. a bonding layer;

4. a positive terminal; 5. and a negative terminal.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present application more clear and obvious, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

As shown in fig. 1 to 5, a single battery 100 provided in the embodiment of the present application includes a battery case 1, a pole piece 2 packaged in the battery case 1, and a composite layer 3 wrapped on an outer surface of the battery case 1, where the composite layer 3 includes a polyurea layer 31, a buffer layer 32, and an adhesive layer 33 sequentially disposed from outside to inside, and the adhesive layer 33 is wrapped and bonded on an outer surface of the battery case 1.

In the present application, the polyurea layer 31 is formed by mixing and reacting a first component and a second component, wherein the first component comprises isocyanate and ceramic particles, and the size of the ceramic particles is 0.01-100 microns; the second component includes ceramic particles and an amine, wherein the ceramic particles have a size of 0.01 to 100 microns. Ceramic particles enable electrical insulation between adjacent single batteries, and in addition, the polyurea layer 31 can absorb and disperse acting force, so that the polyurea layer 31 is not easy to tear, therefore, the battery shell 1 and the pole core 2 are difficult to enter into the adjacent single batteries, and the occurrence of the thermal runaway phenomenon of the batteries is further avoided.

In one embodiment, the cushion layer 32 is wrapped around and bonded to the outer surface of the adhesive layer 33. The buffer layer can buffer and absorb impact energy during puncturing, so that impact on the battery shell and the pole core is weakened, and damage to the single battery is further reduced.

In one embodiment, the polyurea layer 31 is coated on the outer surface of the cushioning layer 32. The polyurea layer can be made uniform in thickness by coating.

In one embodiment, the material of the buffer layer 32 is a flexible coating composed of butyl ester, xylene, cyclohexanone, and an elastomer.

In one embodiment, the material of the bonding layer is composed of polyether, polyester, plasticizer and solvent.

In one embodiment, the single battery is in a flat rectangular parallelepiped shape. Other shapes, such as pentagonal or hexagonal shapes, can be set according to actual production needs.

The single battery is a soft package battery or a hard shell battery. Preferably a pouch laminate battery. The pole pieces of the soft package laminated battery are flaky and are stacked into multiple layers. The shape of the pole piece is consistent with that of the battery shell.

In one embodiment, a positive terminal 4 and a negative terminal 5 are spaced apart from each other and are extended from one surface of the unit battery 100 in the longitudinal direction. The positive terminal and the negative terminal are led out from the same side, so that battery modules are grouped, the connection structure of the battery modules is simplified, and the use of connecting sheets is reduced.

The positive electrode terminal 4 and the negative electrode terminal 5 are sheet-shaped. The sheet is easy to bend and is conveniently connected with the connecting sheet.

In one embodiment, the polyurea layer 31 has a thickness of 0.3 to 3mm.

The buffer layer 32 has a thickness of 0.2-2mm.

The thickness of the bonding layer is 0.1-1mm.

According to the battery cell of the embodiment of the application, the composite bed wraps up on battery case's the surface, the composite bed includes polyurea layer, buffer layer and the tie coat that outside-in set gradually, the tie coat cladding bonds on battery case's the surface. The utility model provides a single cell, a large amount of thermal runaway that compound anticollision layer can effectually avoid the puncture to lead to only can cause very little pinhole after the puncture, and the polyurea layer can absorb and disperse the effort for the polyurea layer is difficult to torn. The polyurea layer has adhesive force to the battery shell, so that the impact resistance of the single battery is improved, and the time of reaching the ignition point due to thermal runaway of the single battery can be effectively delayed.

In addition, as shown in fig. 6, an embodiment of the present application further provides a battery module, which includes a module case (not shown) and a plurality of the single batteries 100 of the above-mentioned embodiments, wherein the plurality of the single batteries 100 are stacked in a thickness direction thereof and disposed in the module case.

In one embodiment, the module case includes a module case body (not shown) and a protective layer (not shown) wrapped on an outer surface of the module case body.

In one embodiment, the protective layer includes a polyurea layer, a buffer layer and a bonding layer, which are sequentially disposed from outside to inside, and the bonding layer is wrapped and bonded on the outer surface of the module housing body. The same cladding has the polyurea layer on the module shell body and can further improve the shock resistance of battery module, protects battery cell.

In other embodiments, the protective layer may also be a plastic or metal shell.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The single battery is characterized by comprising a battery shell, a pole core packaged in the battery shell and a composite layer wrapped on the outer surface of the battery shell, wherein the composite layer comprises a polyurea layer, a buffer layer and a bonding layer which are sequentially arranged from outside to inside, and the bonding layer is wrapped and bonded on the outer surface of the battery shell.

2. The cell defined in claim 1, wherein the cushion layer wraps around and is bonded to an outer surface of the adhesive layer.

3. The cell defined in claim 1, wherein the polyurea layer is coated on an outer surface of the buffer layer.

4. The cell defined in claim 1, wherein the cell is in the shape of a flat cuboid;

the single battery is a soft package battery or a hard shell battery.

5. The battery cell according to claim 1, wherein a positive terminal and a negative terminal are led out from one surface of the battery cell in the longitudinal direction at intervals;

6. The cell according to claim 1, wherein the polyurea layer has a thickness of 0.3 to 3mm;

the thickness of the buffer layer is 0.2-2mm;

the thickness of the bonding layer is 0.1-1mm.

7. A battery module comprising a module case and a plurality of the unit cells according to any one of claims 1 to 6, the plurality of unit cells being stacked in a thickness direction thereof and disposed in the module case.

8. The battery module according to claim 7, wherein the module case comprises a module case body and a protective layer wrapped on an outer surface of the module case body.

9. The battery module according to claim 8, wherein the protective layer comprises a polyurea layer, a buffer layer and a bonding layer, which are sequentially arranged from outside to inside, and the bonding layer is wrapped and bonded on the outer surface of the module housing body.