CN210092253U

CN210092253U - Prevent electric core structure of short circuit

Info

Publication number: CN210092253U
Application number: CN201920963896.1U
Authority: CN
Inventors: 韩冰; 纪荣进; 郑明清; 陈杰; 李载波; 杨山
Original assignee: Huizhou Li Wei Amperex Technology Ltd
Current assignee: Huizhou Li Wei Amperex Technology Ltd; Huizhou Liwinon Energy Technology Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-02-18
Anticipated expiration: 2029-06-25

Abstract

The utility model belongs to the technical field of the battery, concretely relates to prevent electric core structure of short circuit, including multilayer pole piece and multilayer diaphragm, it is adjacent two-layer the pole piece passes through the diaphragm is spaced apart, the pole piece the crisscross stack of diaphragm forms electric core structure, multilayer the tip of diaphragm all outstanding in the multilayer the tip of pole piece, the multilayer the close laminating of tip of diaphragm is in the same place. When the lithium ion battery cell drop test is carried out, the end parts of the multiple layers of diaphragms are tightly attached together, the diaphragms are effectively prevented from being collided and turned over, short circuit combustion or explosion caused by contact of positive and negative electrodes due to the fact that the diaphragms are turned over is avoided, the safety performance of the battery cell is improved, meanwhile, the generation of defective products is reduced, the production cost is reduced, and the battery cell is simple in structure and convenient to popularize and apply.

Description

Prevent electric core structure of short circuit

Technical Field

The utility model belongs to the technical field of the battery, concretely relates to prevent electric core structure of short circuit.

Background

When a lithium ion cell drop test is carried out, electrolyte in the cell can impact the diaphragm due to violent vibration, and the diaphragm is turned over due to collision during drop, so that the positive electrode and the negative electrode of the cell are contacted, and short circuit combustion or explosion occurs.

Among the prior art, make the structure of electric core more firm through pasting the adhesive tape to electric core to prevent that the diaphragm from taking place to turn over and roll over, solve above-mentioned problem, this kind of mode need consume a large amount of adhesive tapes, and the adhesive tape is pasted insecurely, and the sticky tape is not hard up easily in the testing process, drops, leads to the short circuit, simultaneously, has higher requirement to the technology of pasting of adhesive tape, leads to high in production cost, inefficiency, is unfavorable for the development of enterprise.

In view of the above, the related art needs to be perfected.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the battery cell structure is characterized in that the edges of multiple layers of diaphragms in the battery cell are packaged and bonded together, short circuit combustion or explosion caused by the fact that the diaphragms are turned over in violent vibration is effectively avoided, safety performance of the battery cell is improved, defective products are reduced, and production cost is reduced.

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

the utility model provides an electric core structure of preventing short circuit, includes multilayer pole piece and multilayer diaphragm, adjacent two-layer the pole piece passes through the diaphragm is spaced apart, pole piece, the diaphragm is crisscross to be stacked and is formed electric core structure, the tip of multilayer diaphragm all stands out in the tip of multilayer the pole piece, the tip of multilayer diaphragm is closely laminated together. When the lithium ion battery cell drop test is carried out, the end parts of the multiple layers of diaphragms are tightly attached together, the diaphragms are effectively prevented from being collided and turned over, short circuit combustion or explosion caused by contact of positive and negative electrodes due to the fact that the diaphragms are turned over is avoided, the safety performance of the battery cell is improved, meanwhile, the generation of defective products is reduced, the production cost is reduced, and the battery cell is simple in structure and convenient to popularize and apply.

As an improvement of the short-circuit-proof battery cell structure, the size of the diaphragm is larger than that of the pole piece. The design ensures that the end part of the diaphragm protrudes out of the end part of the pole piece, and is convenient for sealing the diaphragm for multiple times.

As an improvement, the multilayer of electric core structure of preventing short circuit the mode that laser welding, ultrasonic bonding, hot wire welding, vibration welding, hot gas welding, hot plate butt fusion or solvent are connected is passed through to the tip of diaphragm is closely laminated together. Besides, other end enclosure modes capable of achieving the same effect can be adopted, and the end enclosure device can be flexibly arranged according to actual conditions.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is one of the schematic structural diagrams of the present invention;

fig. 2 is a second schematic structural diagram of the present invention;

wherein: 1-pole piece; 2-a diaphragm.

Detailed Description

As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, within which a person skilled in the art can solve the technical problem to substantially achieve the technical result.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the present invention.

As shown in fig. 1-2, an anti-short circuit cell structure includes multiple layers of electrode plates 1 and multiple layers of diaphragms 2, where two adjacent layers of electrode plates 1 are separated by the diaphragms 2, the electrode plates 1 and the diaphragms 2 are stacked in a staggered manner to form a cell structure, the end portions of the multiple layers of diaphragms 2 protrude from the end portions of the multiple layers of electrode plates 1, and the end portions of the multiple layers of diaphragms 2 are tightly attached together. When the lithium ion battery cell drop test is carried out, the end parts of the multiple layers of diaphragms 2 are tightly attached together, so that the diaphragms 2 are effectively prevented from being collided and turned over, short circuit combustion or explosion caused by contact of positive and negative electrodes due to the fact that the diaphragms 2 are turned over is avoided, the safety performance of the battery cell is improved, meanwhile, the generation of defective products is reduced, the production cost is reduced, and the battery cell is simple in structure and convenient to popularize and apply.

Preferably, the size of the membrane 2 is larger than the size of the pole piece 1. The design ensures that the end part of the diaphragm 2 protrudes out of the end part of the pole piece 1, and is convenient for sealing the diaphragm 2 for multiple times.

Preferably, the ends of the multilayer diaphragm 2 are tightly attached together by means of laser welding, ultrasonic welding, hot wire welding, vibration welding, hot gas welding, hot plate welding or solvent bonding. Besides, other end enclosure modes capable of achieving the same effect can be adopted, and the end enclosure device can be flexibly arranged according to actual conditions.

The utility model discloses a theory of operation is: when the lithium ion battery cell drop test is carried out, the end parts of the multiple layers of diaphragms 2 are tightly attached together, so that the diaphragms 2 are effectively prevented from being knocked and turned over, short circuit combustion or explosion caused by contact of positive and negative electrodes due to the fact that the diaphragms 2 are turned over is avoided, the safety performance of the battery cell is improved, meanwhile, the generation of defective products is reduced, and the production cost is reduced.

While the foregoing description shows and describes several preferred embodiments of the invention, it is to be understood, as noted above, that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.

Claims

1. The utility model provides a prevent electric core structure of short circuit which characterized in that: the battery comprises a plurality of layers of pole pieces (1) and a plurality of layers of diaphragms (2), wherein the adjacent two layers of pole pieces (1) are spaced by the diaphragms (2), the pole pieces (1) and the diaphragms (2) are stacked in a staggered mode to form a battery cell structure, the end parts of the plurality of layers of diaphragms (2) protrude out of the end parts of the plurality of layers of pole pieces (1), and the end parts of the plurality of layers of diaphragms (2) are closely attached together.

2. The short-circuit-resistant cell structure of claim 1, wherein: the size of the diaphragm (2) is larger than that of the pole piece (1).

3. The short-circuit-resistant cell structure of claim 1, wherein: the ends of the multiple layers of the diaphragm (2) are closely attached together in a laser welding mode, an ultrasonic welding mode, a hot metal wire welding mode, a vibration welding mode, a hot gas welding mode, a hot plate welding mode or a solvent connecting mode.