CN216054896U

CN216054896U - Secondary battery

Info

Publication number: CN216054896U
Application number: CN202121991080.3U
Authority: CN
Inventors: 臧世伟
Original assignee: Chongqing Jinmei New Material Technology Co Ltd
Current assignee: Chongqing Jinmei New Material Technology Co Ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-03-15
Anticipated expiration: 2031-08-23

Abstract

The utility model discloses a secondary battery, which comprises a shell, a battery cell and a top plate, wherein the shell is provided with a plurality of battery cells; the shell comprises a concave cavity formed by enclosing a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate, the battery core is positioned in the concave cavity, and the top plate covers the opening of the concave cavity; the first side plate comprises an inner shell heat conduction layer and an outer shell heat conduction layer, and a first groove is formed between the inner shell heat conduction layer and the outer shell heat conduction layer; the second side plate, the third side plate and the fourth side plate respectively comprise a flame-retardant layer, a heat conduction layer and a supporting layer positioned between the heat conduction layer and the flame-retardant layer, one surface of the supporting layer, facing the flame-retardant layer, is provided with a second groove, the first groove is communicated with the second groove, and heat absorption bags are arranged in the first groove and the second groove; the utility model has the beneficial effects that: the battery core thermal runaway can be prevented, and the normal operation of other battery cores is prevented from being influenced by heat transfer to other battery cores.

Description

Secondary battery

Technical Field

The present invention relates to the field of battery technology, and more particularly, to a secondary battery.

Background

A lithium ion battery is a type of secondary battery. In a lithium ion battery, lithium ions migrate from the negative electrode to the positive electrode during a discharge operation, while lithium ions migrate from the positive electrode to the negative electrode during a charge operation. Lithium ion batteries are widely used in portable electronic devices because they have high energy density, no memory effect, and low natural discharge rate during non-use.

In addition, due to the high energy density of lithium ion batteries, lithium ion batteries are increasingly used in various application fields including electronic tools, electric bicycles, electric motorcycles, electric automobiles, airplanes, and the like.

Lithium ion battery can produce the heat in the use, and thermal runaway can produce a large amount of heats, and the heat can influence the normal operating of other electric cores on can transmitting other electric cores.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides a secondary battery which can prevent a battery cell from thermal runaway and avoid the influence on the normal operation of other battery cells caused by the heat transferred to other battery cells.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the improvement of the secondary battery is that the secondary battery comprises a shell, a battery core and a top plate;

the shell comprises a concave cavity formed by enclosing a first side plate, a second side plate, a third side plate, a fourth side plate and a bottom plate, the battery core is positioned in the concave cavity, and the top plate covers the opening of the concave cavity;

the first side plate comprises an inner shell heat conduction layer and an outer shell heat conduction layer, and a first groove is formed between the inner shell heat conduction layer and the outer shell heat conduction layer;

the second side plate, the third side plate and the fourth side plate respectively comprise a flame-retardant layer, a heat-conducting layer and a supporting layer located between the heat-conducting layer and the flame-retardant layer, a second groove is formed in one surface, facing the flame-retardant layer, of the supporting layer, the first groove is communicated with the second groove, and heat absorption bags are arranged in the first groove and the second groove.

In the structure, the heat absorption bag is internally provided with heat conduction liquid, and the heat conduction liquid is water, paraffin or heat conduction oil.

In the above structure, the first groove is disposed on a surface of the outer heat conducting layer facing the inner heat conducting layer.

In the structure, a heat transfer component is arranged in the cavity of the shell and is positioned at one end close to the first side plate;

the heat transfer component comprises a movable heat conduction plate, an arc elastic plate and a contact plate, the middle part of the arc elastic plate is fixed on the movable heat conduction plate, two ends of the arc elastic plate bend towards the direction far away from the movable heat conduction plate, the contact plate is positioned on one side of the arc elastic plate, and the contact plate is connected with the arc elastic plate through a push rod; when the battery cell is placed in the concave cavity, the side wall of the battery cell is attached to the movable heat conducting plate.

In the above structure, the inner side of the first side plate is provided with a support pillar, and two ends of the arc-shaped elastic plate are pressed on the support pillar.

In the above structure, the electric core is provided with an electric contact point, and the top plate is provided with a through hole corresponding to the electric contact point.

The utility model has the beneficial effects that: because first curb plate, the second curb plate, the equal shell of third curb plate and fourth curb plate all can heat conduction, consequently, the heat is not only at the first curb plate of flow direction, the second curb plate, the in-process of third curb plate fourth curb plate can disappear, and the heat also can give off through the shell heat-conducting layer, the second curb plate, the inner wall of third curb plate and fourth curb plate is fire-retardant layer, can prevent that the heat that outwards gives off from returning electric core again, help the heat of electric core to further give off, the circumstances such as explosion have been prevented because of the high temperature to electric core.

Drawings

Fig. 1 is an exploded view schematically illustrating a secondary battery according to the present invention.

Fig. 2 is a schematic view of the internal structure of a case of a secondary battery according to the present invention.

Fig. 3 is a schematic cross-sectional view illustrating a second side plate, a third side plate and a fourth side plate of a secondary battery according to the present invention.

Fig. 4 is a schematic cross-sectional view illustrating a first side plate of a secondary battery according to the present invention.

Detailed Description

The utility model is further illustrated with reference to the following figures and examples.

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the utility model can be interactively combined on the premise of not conflicting with each other.

Referring to fig. 1 to 4, the present invention discloses a secondary battery, specifically, the secondary battery includes a casing 10, a battery cell 20, and a top plate 30, and as shown in fig. 2, the casing 10 includes a cavity surrounded by a first side plate 101, a second side plate 102, a third side plate 103, a fourth side plate 104, and a bottom plate 105, the battery cell 20 is located in the cavity, the top plate 30 covers an opening of the cavity, an electrical contact point 201 is disposed on the battery cell 20, a through hole 301 is disposed in a position of the top plate 30 corresponding to the electrical contact point 201, and the top plate 30 and the casing 10 are used to implement the sealing of the battery cell 20.

With reference to fig. 4, regarding the structure of the first side plate 101, the present invention provides an embodiment, the first side plate 101 includes an inner heat conducting layer 1011 and an outer heat conducting layer 1012, a first groove is disposed between the inner heat conducting layer 1011 and the outer heat conducting layer 1012, and heat conduction is achieved through the outer heat conducting layer 1012 and the outside; and, the first recess is disposed on the side of the outer conductive layer 1012 facing the inner conductive layer 1011. Referring to fig. 3, the present invention provides a specific embodiment of the structures of the second side plate 102, the third side plate 103 and the fourth side plate 104, and specifically, since the structures of the second side plate 102, the third side plate 103 and the fourth side plate 104 are the same, only the structure of the second side plate 102 is described in this embodiment. The second side plate 102 includes a flame retardant layer 1021, a heat conductive layer 1022, and a support layer 1023 located between the heat conductive layer 1022 and the flame retardant layer 1021, and heat conduction with the outside is realized through the heat conductive layer 1022, and a strength support function is performed through the support layer 1023. A second groove is formed in one surface, facing the flame-retardant layer 1021, of the supporting layer 1023, the first groove is communicated with the second groove, and heat absorption bags 40 are arranged in the first groove and the second groove; in this embodiment, the heat absorption bag 40 has a heat conducting liquid therein, and the heat conducting liquid is paraffin; it should be noted that the heat transfer fluid may also be water or heat transfer oil, and may be selected according to actual needs.

Because the shells of the first side plate 101, the second side plate 102, the third side plate 103 and the fourth side plate 104 can conduct heat, therefore, the heat can disappear not only in the process of flowing to the first side plate 101, the second side plate 102 and the fourth side plate 104 of the third side plate 103, but also can be dissipated through the shell heat conduction layer 1012, the inner walls of the second side plate 102, the third side plate 103 and the fourth side plate 104 are the flame retardant layer 1021, the heat dissipated outwards can be prevented from being transmitted back to the battery cell 20, the further dissipation of the heat of the battery cell 20 is facilitated, and the situations that the battery cell 20 explodes due to overhigh temperature and the like are prevented.

Referring to fig. 2, a heat transfer assembly 50 is disposed in the cavity of the housing 10, and the heat transfer assembly 50 is located at an end close to the first side plate 101; the heat transfer assembly 50 comprises a movable heat conducting plate 501, an arc-shaped elastic plate 502 and a contact plate 503, wherein the middle part of the arc-shaped elastic plate 502 is fixed on the movable heat conducting plate 501, the two ends of the arc-shaped elastic plate 502 are bent towards the direction away from the movable heat conducting plate 501, the contact plate 503 is positioned on one side of the arc-shaped elastic plate 502, and the contact plate 503 is connected with the arc-shaped elastic plate 502 through a push rod 505; when the battery cell 20 is placed in the cavity, the side wall of the battery cell 20 is attached to the movable heat conducting plate 501. Moreover, a supporting column 504 is arranged on the inner side of the first side plate 101, and two ends of the arc-shaped elastic plate 502 are pressed on the supporting column 504; due to the supporting columns 504, the arc-shaped elastic plates 502 are prevented from pressing the heat absorption packs 40 on the first side plate 101. When the battery cell 20 is located in the cavity of the casing 10, due to the action of the arc-shaped elastic plate 502, the battery cell 20 and the movable heat conducting plate 501 can make good contact, so that a good heat conducting effect is achieved.

While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A secondary battery is characterized by comprising a shell, a battery cell and a top plate;

2. The secondary battery of claim 1, wherein the heat absorption bag is filled with a heat conducting liquid, and the heat conducting liquid is water, paraffin or heat conducting oil.

3. The secondary battery of claim 1 wherein the first recess is formed in a side of the thermally conductive layer of the outer casing facing the thermally conductive layer of the inner casing.

4. The secondary battery of claim 1, wherein a heat transfer assembly is disposed within the cavity of the housing, the heat transfer assembly being located adjacent to one end of the first side plate;

5. The secondary battery according to claim 4, wherein a support pillar is provided on the inner side of the first side plate, and both ends of the arc-shaped elastic plate are pressed against the support pillar.

6. The secondary battery of claim 1, wherein the electrical core is provided with electrical contacts, and the top plate is provided with through holes corresponding to the electrical contacts.