CN217522130U - Battery cover plate assembly, battery and electric equipment - Google Patents

Abstract

The utility model belongs to the technical field of lithium batteries, and particularly relates to a battery cover plate assembly, a battery and electric equipment, wherein the battery cover plate assembly comprises a cover body and an explosion-proof assembly, and the explosion-proof assembly is arranged on the cover body; the explosion-proof assembly comprises an explosion-proof valve and a bimetallic strip arranged on one side of the explosion-proof valve, and the projection of the explosion-proof valve and the projection of the bimetallic strip are partially overlapped in the thickness direction of the cover body. The utility model provides a pair of battery cover plate subassembly, it is provided with the bimetallic strip in one side of explosion-proof valve, when the inside temperature of battery reached safe temperature, the bimetallic strip took place to deform and to a lateral bending who keeps away from the explosion-proof valve, and the bimetallic strip gives an outside pulling force of explosion-proof valve, makes the valve port of explosion-proof valve open to the inside heat of quick discharge battery effectively avoids the battery to take place the phenomenon of thermal runaway, and then has avoided the battery to catch fire, the risk of explosion.

Description

Battery cover plate assembly, battery and electric equipment

Technical Field

The utility model belongs to the technical field of the lithium cell, concretely relates to battery cover plate subassembly, battery and consumer.

Background

Compared with the aluminum plastic film soft package battery which is generally used at present, the steel-shell battery has the following advantages:

1. the widths of the top sealing edge and the side sealing edge are reduced, the space utilization rate is increased, and the energy density of the battery cell is higher;

2. the safety is good, and the battery core has the advantage of higher reliability in the extreme environment.

However, at present, an explosion-proof valve is conventionally arranged on a cover plate of a steel-shell battery, the internal pressure exceeds a safety standard to break the explosion-proof valve, theoretically, the deeper the notch of the explosion-proof valve is, the smaller the critical pressure for breaking the explosion-proof valve is, and actually, in order to ensure the high energy density of the battery, the cover plate is often very thin in thickness, so that the deeper the notch is, the higher the process requirement is, the insufficient notch cannot be broken at the required pressure, and meanwhile, the explosion-proof valve on the cover plate of the steel-shell battery can only control the internal pressure of the battery, and the temperature of the battery has no safety monitoring effect.

SUMMERY OF THE UTILITY MODEL

One of the purposes of the utility model lies in: the battery cover plate assembly solves the problem that the existing explosion-proof valve cannot well monitor the internal temperature of a battery.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a battery cover plate component comprises a cover body and an explosion-proof component, wherein the explosion-proof component is arranged on the cover body; the explosion-proof assembly comprises an explosion-proof valve and a bimetallic strip arranged on one side of the explosion-proof valve, and the projection of the explosion-proof valve and the projection of the bimetallic strip are partially overlapped in the thickness direction of the cover body.

Furthermore, one end of the bimetallic strip is fixedly connected with the explosion-proof valve in a bonding or welding mode, and the other end of the bimetallic strip is fixedly connected with the cover body in a bonding or welding mode.

Furthermore, the thickness of the cover body is 0.1-0.6 mm.

Further, the bimetal sheet comprises an active layer and a passive layer, and the active layer is cold-rolled and compounded on the surface of the passive layer.

Further, the active layer is made of a manganese-nickel-copper alloy material, and the passive layer is made of a nickel-iron alloy material.

Further, the explosion-proof valve is U-shaped.

Furthermore, the peripheral face of one end of the bimetallic strip is an arc face, and the arc face is located right above the explosion-proof valve.

The second purpose of the utility model is that: the battery comprises the battery cover plate assembly, a shell and a battery core, wherein the battery core is arranged in the shell, and the battery cover plate assembly covers an open opening of the shell and is connected with the shell in a sealing mode.

The third purpose of the utility model is that: an electric device is provided, comprising the battery.

The beneficial effects of the utility model reside in that: a battery cover plate component comprises a cover body and an explosion-proof component, wherein the explosion-proof component is arranged on the cover body; the explosion-proof assembly comprises an explosion-proof valve and a bimetallic strip arranged on one side of the explosion-proof valve, and the projection of the explosion-proof valve and the projection of the bimetallic strip are partially overlapped in the thickness direction of the cover body. The utility model provides a pair of battery cover plate subassembly, it is provided with the bimetallic strip in one side of explosion-proof valve, when the inside temperature of battery reached safe temperature, the bimetallic strip took place to deform and to a lateral bending who keeps away from the explosion-proof valve, and the bimetallic strip gives an outside pulling force of explosion-proof valve, makes the valve port of explosion-proof valve open to the inside heat of quick discharge battery effectively avoids the battery to take place the phenomenon of thermal runaway, and then has avoided the battery to catch fire, the risk of explosion.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

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

fig. 2 is a second schematic structural diagram of a battery according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a cover body according to an embodiment of the present invention;

FIG. 4 is a schematic structural view of an explosion-proof assembly according to an embodiment of the present invention;

fig. 5 is a schematic view of a bimetal of an embodiment of the present invention before deformation;

fig. 6 is a schematic view of a bimetal strip according to an embodiment of the present invention after deformation;

fig. 7 is a second schematic diagram of the bimetal strip after deformation according to the embodiment of the present invention.

Wherein the reference numerals are as follows:

1. a cover body; 2. an explosion-proof assembly; 21. an explosion-proof valve; 22. a bimetal; 221. an active layer; 222. a passive layer; 22a, a circular arc surface; 3. a housing; 4. and (5) battery cores.

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, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

In the description of the application, 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, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention.

In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; "connected" may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The present invention will be described in further detail with reference to fig. 1 to 7, but the present invention is not limited thereto.

The specific embodiment provides a battery, which comprises a battery cover plate assembly, a shell 3 and a battery core 4, wherein the battery core 4 is arranged in the shell 3, and the battery cover plate assembly covers an open opening of the shell 3 and is connected with the shell 3 in a sealing mode. Specifically, the battery cell 4 is formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet, and in the present embodiment, the case 3 is made of a steel material.

The battery cover plate component in the embodiment comprises a cover body 1 and an explosion-proof component 2, wherein the explosion-proof component 2 is arranged on the cover body 1, and the internal pressure of the battery is controlled by controlling the depth of a notch; the explosion-proof assembly 2 comprises an explosion-proof valve 21 and a bimetallic strip 22 arranged on one side of the explosion-proof valve 21, and the projection of the explosion-proof valve 21 and the projection of the bimetallic strip 22 are partially overlapped in the thickness direction of the cover body 1. The utility model provides a battery cover plate subassembly, it is provided with bimetallic strip 22 in one side of explosion-proof valve 21, when the inside temperature of battery reached safe temperature, bimetallic strip 22 took place to deform and to a lateral bending of keeping away from explosion-proof valve 21, bimetallic strip 22 gives 21 an outside pulling force of explosion-proof valve, make explosion-proof valve 21's valve port open to the inside heat of quick discharge battery effectively avoids the battery to take place the phenomenon of thermal runaway, and then has avoided the battery to catch fire, the risk of explosion.

Preferably, one end of the bimetal strip 22 is fixedly connected with the explosion-proof valve 21 by means of bonding or welding, and the other end of the bimetal strip 22 is fixedly connected with the cover body 1 by means of bonding or welding. When the temperature in the battery rises to the safe temperature rapidly, the temperature is transmitted to the bimetallic strip 22, the bimetallic strip 22 deforms along with the temperature, one end, fixed on the cover body 1, of the bimetallic strip 22 provides a supporting force for the bimetallic strip, the bimetallic strip 22 can be prevented from shifting, meanwhile, the bimetallic strip 22 can be made to bend towards one side far away from the explosion-proof valve 21 when bending, in addition, the other end, fixed on the explosion-proof valve 21, of the bimetallic strip 22 can provide a pulling force for the explosion-proof valve 21 when bending towards one side far away from the explosion-proof valve 21, so that a valve port covered by the explosion-proof valve 21 can be opened rapidly, the heat in the battery can be released, and the thermal runaway phenomenon of the battery is avoided.

Preferably, the thickness of the cover body 1 is 0.1-0.6 mm. The structural design is convenient for arranging the explosion-proof valve 21, reduces the process difficulty of etching the explosion-proof valve 21, and can meet the requirement of high energy density of the battery.

The bimetal 22, also called thermal bimetal 22, is a composite material composed of two or more metals or other materials with appropriate properties, and because of the different thermal expansion coefficients of the component layers, when the temperature changes, the deformation of the active layer 221 is larger than that of the passive layer 222, so that the whole bimetal 22 bends toward the passive layer 222, and the curvature of the composite material changes, thereby generating deformation. In the present embodiment, the bimetal 22 includes an active layer 221 and a passive layer 222, the active layer 221 is cold-rolled and compounded on the surface of the passive layer 222, the active layer 221 is made of a nichrome material having a high expansion coefficient, and the passive layer 222 is made of a nickel-iron alloy material having a low expansion coefficient.

In the present embodiment, the explosion-proof valve 21 is provided in a U-shape, and in order to ensure that one end of the bimetal 22 is tightly attached to the explosion-proof valve 21, the outer peripheral surface of one end of the bimetal 22 in the present embodiment is an arc surface 22a, and the arc surface 22a is located directly above the explosion-proof valve 21.

Specifically, the bimetal 22 in the present embodiment is preferably disposed on the side of the explosion-proof valve 21 away from the battery cell 4, but it should be noted that if the material of the bimetal 22 has electrolyte corrosion resistance, it can be designed on the side of the explosion-proof valve 21 facing the battery cell 4, that is, inside the battery.

The application also provides an electric device which comprises the battery. The electric device in this embodiment may be, but is not limited to, a notebook computer, an electronic book reader, a mobile phone, a liquid crystal television, a portable CD, an electronic notebook, a calculator, a radio, a backup power supply, an electric motor, an automobile, a motorcycle, a power-assisted bicycle, a game machine, an electric tool, a flashlight, a camera, and the like.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should understand that the embodiments as a whole may be combined as appropriate to form other embodiments understood by those skilled in the art.

Variations and modifications to the above-described embodiments may become apparent to those skilled in the art from the disclosure and teachings of the above description. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious modifications, replacements or variations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims (9)

1. A battery cover plate assembly, its characterized in that: comprises that

A lid body (1);

the anti-explosion assembly (2), the anti-explosion assembly (2) is arranged on the cover body (1);

the explosion-proof assembly (2) comprises an explosion-proof valve (21) and a bimetallic strip (22) arranged on one side of the explosion-proof valve (21), and the projection of the explosion-proof valve (21) and the projection of the bimetallic strip (22) are partially overlapped in the thickness direction of the cover body (1).

2. The battery cover plate assembly of claim 1, wherein: one end of the bimetallic strip (22) is fixedly connected with the explosion-proof valve (21) in a bonding or welding mode, and the other end of the bimetallic strip (22) is fixedly connected with the cover body (1) in a bonding or welding mode.

3. The battery cover plate assembly of claim 1, wherein: the thickness of the cover body (1) is 0.1-0.6 mm.

4. The battery cover plate assembly of claim 1, wherein: the bimetal sheet (22) comprises an active layer (221) and a passive layer (222), wherein the active layer (221) is cold-rolled and compounded on the surface of the passive layer (222).

5. The battery cover plate assembly of claim 4, wherein: the active layer (221) is made of a manganese-nickel-copper alloy material, and the passive layer (222) is made of a nickel-iron alloy material.

6. The battery cover plate assembly of claim 1, wherein: the explosion-proof valve (21) is U-shaped.

7. A battery cover plate assembly according to claim 6, wherein: the peripheral surface of one end of the bimetallic strip (22) is an arc surface (22a), and the arc surface (22a) is located right above the explosion-proof valve (21).

8. A battery, characterized by: the battery comprises the battery cover plate assembly of any one of claims 1 to 7, a shell (3) and a battery cell (4), wherein the battery cell (4) is arranged in the shell (3), and the battery cover plate assembly covers an open opening of the shell (3) and is connected with the shell (3) in a sealing mode.

9. An electric device comprising the battery of claim 8.

Images