CN211295152U

CN211295152U - Battery with a battery cell

Info

Publication number: CN211295152U
Application number: CN201922114105.0U
Authority: CN
Inventors: 刘祖超; 苏义松
Original assignee: Ningde Amperex Technology Ltd
Current assignee: Ningde Amperex Technology Ltd
Priority date: 2019-11-30
Filing date: 2019-11-30
Publication date: 2020-08-18
Anticipated expiration: 2029-11-30

Abstract

The application provides a battery of anti falling, it includes electric core, packaging shell and bonding piece, electric core encapsulate in the packaging shell and pass through bonding piece with the packaging shell bonds. The electric core comprises a first end face, a second end face opposite to the first end face and is connected with the first end face and the peripheral face of the second end face, the peripheral face comprises a first surface and a second surface opposite to the first surface, the bonding piece comprises a first bonding portion and a second bonding portion which are connected with each other, the first bonding portion is arranged between the first surface and the second surface and the packaging shell, and the second bonding portion is arranged between the second end face and the packaging shell.

Description

Battery with a battery cell

Technical Field

The present application relates to the field of electrochemical devices, and more particularly, to a drop resistant battery.

Background

The cell of the battery is sealed in a packaging shell. A certain gap exists between the battery cell and the inner wall of the packaging shell, so that the battery cell has a small moving space in the packaging shell. When the battery falls down for various reasons, the battery core can break the seal of the packaging shell so as to cause electrolyte leakage; the sliding between the pole pieces of each layer of the battery core sometimes causes the short circuit in the battery, and further causes heating, ignition or explosion.

SUMMERY OF THE UTILITY MODEL

Based on the deficiency of the above prior art, the present application provides a battery, it can effectively improve the safety performance that falls of battery.

The embodiment of the application provides a battery, including electric core, packaging shell and bonding piece, electric core encapsulate in the packaging shell and pass through bonding piece with the packaging shell bonds. The electric core comprises a first end face, a second end face opposite to the first end face and is connected with the first end face and the peripheral face of the second end face, the peripheral face comprises a first surface and a second surface opposite to the first surface, the bonding piece comprises a first bonding portion and a second bonding portion which are connected with each other, the first bonding portion is arranged between the first surface and the second surface and the packaging shell, and the second bonding portion is arranged between the second end face and the packaging shell.

In some embodiments, the first bonding portion is disposed around the circumferential surface between the circumferential surface and the package case.

In some embodiments, the first bonding portion covers 50% to 100% of the area of the sum of the first surface and the second surface.

In some embodiments, the second bonding portion partially covers the second end face.

In some embodiments, the second bonding portion covers a middle region of the second end face.

In some embodiments, the second bonding portion covers a side edge region of the second end face.

In some embodiments, the adhesive member covers corners of the battery cell.

In some embodiments, the first bonding portion is integrally disposed with the second bonding portion.

In some embodiments, the adhesive member is a tape or a glue layer, the tape is formed by compounding a substrate and a glue, wherein the substrate is PP or PET.

In some embodiments, the adhesive layer or the adhesive of the tape is a hot melt adhesive.

The application provides a battery, through covering at least the first surface of electric core, second surface reach the piece that bonds that has the integral type structure of second terminal surface will electric core bonding is fixed in the inner wall of packaging shell effectively avoids relative slip between each layer of electric core reaches electric core with relative slip between the packaging shell has improved the security performance that falls of battery.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the battery of FIG. 1 with the packaging removed;

FIG. 3 is a schematic reverse side view of the battery of FIG. 2;

FIG. 4 is a schematic view of a battery with its packaging removed according to another embodiment of the present application;

fig. 5 is a schematic view of a battery with a package removed according to another embodiment of the present disclosure.

Description of the main elements

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive effort based on the embodiments in the present application are within the scope of protection of the present application.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms "top end," "bottom end," and the like, as used in the embodiments of the present application, are for the purpose of describing particular embodiments only and are not intended to limit the present application. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Referring to fig. 1, a battery 100 according to an embodiment of the present disclosure includes a battery cell 10, a package case 30, and an adhesive member 50. The battery cell 10 is packaged in the package casing 30 and is bonded to the package casing 30 through the bonding member 50. The battery cell 10 is formed by winding or overlapping a positive plate, a negative plate and an isolating film. Two tabs 20 extend outwards from one end of the battery cell 10, and the tabs 20 extend out from one end of the package casing 30 to be partially exposed outside the package casing 30. The packaging shell 30 may be made of aluminum foil or aluminum-plastic composite film. It is understood that the package case 30 further encloses an electrolyte (not shown).

Referring to fig. 2 and fig. 3, the battery cell 10 is substantially rectangular, and includes a first end surface 11, a second end surface 12 opposite to the first end surface 11, and a peripheral surface 13 connecting the first end surface 11 and the second end surface 12. In this embodiment, the first end surface 11 is a top end surface of the battery cell 10, and the second end surface 12 is a bottom end surface of the battery cell 10. The tab 20 protrudes from the first end surface 11. The peripheral surface 13 includes a first surface 131, a second surface 132 opposite to the first surface 131, and two side surfaces 133 connecting the first surface 131 and the second surface 132.

The adhesive member 50 is an integrated structure and includes a first adhesive portion 51 and a second adhesive portion 53 connected to each other. Alternatively, the first adhesive portion 51 and the second adhesive portion 53 are integrally provided to form the adhesive member 50. In an alternative embodiment, the first bonding portion 51 and the second bonding portion 53 may be separately disposed and then connected to form the bonding element 50. The adhesive member 50 is an adhesive tape or layer, and the adhesive of the adhesive tape or layer is an adhesive that can be used in a lithium ion battery, such as a hot melt adhesive. In an alternative embodiment, the adhesive tape is formed by compounding a base material and an adhesive, wherein the base material is a base material such as PP, PET and the like which can be used in a lithium ion battery.

The first adhesive part 51 is disposed between the first surface 131 and the second surface 132 and the inner wall of the package casing 30, that is, the first adhesive part 51 adhesively fixes the first surface 131 and the second surface 132 to the inner wall of the package casing 30. The second bonding portion 53 is disposed between the second end face 12 and the inner wall of the package casing 30, that is, the second bonding portion 53 adhesively fixes the second end face 12 to the inner wall of the package casing 30.

The first adhesive portion 51 may be disposed on all contact surfaces between the first surface 131 and the second surface 132 and the package case 30, or only a portion of the contact surfaces. Optionally, the first adhesive part 51 covers 50% to 100% of the total area of the first surface 131 and the second surface 132.

Since the bonding members 50 located on the first surface 131, the second surface 132, and the second end surface 12 fix the battery cell 10 from the bottom end of the battery cell 10, it can be effectively ensured that the battery cell 10 does not slide between the layers; the bonding piece 50 bonds and fixes the battery cell 10 to the inner wall of the package casing 30, which can effectively limit the relative displacement between the battery cell 10 and the package casing 30; and the bonding piece 50 is of an integrated structure, and when the impact is applied, each part (such as the first bonding part 51 and the second bonding part 53) can not fall off independently, so that the bonding firmness is enhanced.

Referring to fig. 4, the first bonding portion 51 is further disposed between the two side surfaces 133 and the inner wall of the package shell 30, that is, the first bonding portion 51 is disposed around the circumferential surface 13 and between the circumferential surface 13 and the inner wall of the package shell 30, and the circumferential surface 13 is bonded and fixed to the inner wall of the package shell 30, so as to increase the contact area between the first bonding portion 51 and the package shell 30 and further enhance the bonding firmness.

The second bonding portion 53 partially covers the second end face 12. The area of the second end surface 12 not covered by the second bonding portion 53 serves as an electrolyte wetting channel. The second end face 12 includes a middle region 121 and two side regions located at two sides of the middle region. The second bonding portion 53 covers the side area of the second end face 12, but does not cover the middle area 121, that is, the middle area 121 serves as an electrolyte wetting channel. The second adhesive part 53 may partially or completely cover a side edge region of the second end face 12. Optionally, the second bonding part 53 completely covers the two side edge regions, and is bonded to the first bonding parts 51 on the two side surfaces 133, that is, the second bonding part 53 covers the corners of the battery cell 10.

Referring to fig. 5, the second adhesive portion 53 may also cover the middle region and not cover the side regions 123, that is, the side regions 123 are used as electrolyte wetting channels.

In the battery 100 provided by the present application, the battery core 10 is adhesively fixed to the inner wall of the package casing 30 by the adhesive member 50 having an integrated structure at least covering the first surface 131, the second surface 132 and the second end surface 12 of the battery core 10, so that when the battery 100 falls, the relative sliding between layers of the battery core 10 and the relative sliding between the battery core 10 and the package casing 30 can be effectively avoided; and compared with a split type adhesive, the adhesive member 50 having an integrated structure is more firmly adhered, so that the drop safety of the battery 100 can be effectively improved.

The anti-drop effect of the battery provided by the present application is verified by the following examples.

Example 1

A drop test was performed using the battery structure shown in fig. 4 as a 5-pack battery, in which the first adhesive part 51 covered 50% of the area of the sum of the first surface 131 and the second surface 132.

Example 2

A drop test was performed using the battery structure shown in fig. 4 as a 5-pack battery, in which the first adhesive part 51 covered 60% of the area of the sum of the first surface 131 and the second surface 132.

Example 3

A drop test was performed using the battery structure shown in fig. 4 as a 5-pack battery, in which the first adhesive part 51 covered 70% of the area of the sum of the first surface 131 and the second surface 132.

Example 4

A drop test was performed using the battery structure shown in fig. 4 as a 5-pack battery, in which the first adhesive part 51 covered 80% of the area of the sum of the first surface 131 and the second surface 132.

Example 5

A drop test was performed using the battery structure shown in fig. 4 as a 5-pack battery, in which the first adhesive part 51 covered 90% of the area of the sum of the first surface 131 and the second surface 132.

Example 6

A drop test was performed using the battery structure shown in fig. 4 as a 5-pack battery, in which the first adhesive part 51 covered 100% of the area of the sum of the first surface 131 and the second surface 132.

Example 7

A drop test was performed using a 5-pack battery having a battery structure as shown in fig. 5, in which the first adhesive part 51 covered 50% of the area of the sum of the first surface 131 and the second surface 132.

Example 8

A drop test was performed using a 5-pack battery having a battery structure as shown in fig. 5, in which the first adhesive part 51 covered 60% of the area of the sum of the first surface 131 and the second surface 132.

Example 9

A drop test was performed using a 5-pack battery having a battery structure as shown in fig. 5, in which the first adhesive part 51 covered 70% of the area of the sum of the first surface 131 and the second surface 132.

Example 10

A drop test was performed using a 5-pack battery having a battery structure as shown in fig. 5, in which the first adhesive part 51 covered 80% of the area of the sum of the first surface 131 and the second surface 132.

Example 11

A drop test was performed using a 5-pack battery having a battery structure as shown in fig. 5, in which the first adhesive part 51 covered 90% of the area of the sum of the first surface 131 and the second surface 132.

Example 12

A drop test was performed using a 5-pack battery having a battery structure as shown in fig. 5, in which the first adhesive part 51 covered 100% of the area of the sum of the first surface 131 and the second surface 132.

Comparative example

And 5, adopting a battery structure without a bonding piece on the surface of the battery core to make a product battery for drop test.

The drop test results for the batteries provided in examples 1-12 and comparative example are shown in table 1. Wherein, the non-damage of the packaging shell, the non-damage of the pole piece and the non-damage of the diaphragm are used as the judgment standards for falling.

TABLE 1

As can be seen from table 1, the batteries provided in the present application all passed the drop test, and their drop safety was significantly higher than the batteries provided in the comparative examples. In addition, the larger the area of the first adhesive portion 51 covering the surface of the battery cell 10, the better the drop safety of the battery.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.

Claims

1. The utility model provides a battery, includes electric core, packaging shell and bonding piece, the electric core encapsulate in the packaging shell and pass through bonding piece with the packaging shell bonds, its characterized in that, electric core include first terminal surface, with the relative second terminal surface of first terminal surface and connection first terminal surface with the global of second terminal surface, global include first surface and with the relative second surface of first surface, bonding piece includes interconnect's first portion of bonding and second portion of bonding, first portion of bonding set up in first surface and second surface with between the packaging shell, the second portion of bonding set up in the second terminal surface with between the packaging shell.

2. The battery according to claim 1, wherein the first adhesive portion is disposed around the circumferential surface between the circumferential surface and the package can.

3. The battery according to claim 1, wherein the first adhesive portion covers 50 to 100% of a region of a sum of areas of the first surface and the second surface.

4. The battery of claim 1, wherein the second bonding portion partially covers the second end face.

5. The battery of claim 4, wherein the second bonding portion covers a middle region of the second end face.

6. The battery of claim 4, wherein the second bonding portion covers a side edge region of the second end face.

7. The battery of claim 6, wherein the adhesive wraps around corners of the cell.

8. The battery according to any one of claims 1 to 7, wherein the first bonding portion is provided integrally with the second bonding portion.

9. The battery according to any one of claims 1 to 7, wherein the adhesive member is a tape or a glue layer, the tape is formed by compounding a substrate and a glue, and the substrate is PP or PET.

10. The battery of claim 9, wherein the adhesive layer or the adhesive of the adhesive tape is a hot melt adhesive.