CN211265531U - Cylindrical battery cap - Google Patents

Abstract

The application discloses cylindrical battery cap includes: the anti-explosion device comprises a top cover, a bottom plate, an anti-explosion film clamped between the top cover and the bottom plate, and sealing rubber rings fixedly sleeved on the peripheries of the top cover, the bottom plate and the anti-explosion film; three first pressure relief holes in the three vertexes of an equilateral triangle are penetratingly formed in the bottom plate, and three second pressure relief holes in the three vertexes of the equilateral triangle are penetratingly formed in the top cover. The cylindrical battery cap has the advantages of simple and ingenious structure, convenience in assembly and good explosion-proof performance.

Description

Cylindrical battery cap

Technical Field

The present application relates to a cylindrical battery cap.

Background

With the development of society and the shortage of energy, the development and storage technology of green energy becomes a problem which needs to be solved urgently. Lithium ion batteries have focused attention on the advantages of high energy density, high power density, long cycle life, no memory effect and the like, and are also the development direction of batteries of electric vehicles.

The battery cap is one of the important components of the battery, and the main safety mechanism of the battery is generally designed in the battery cap, but the traditional battery cap has the defects of complex structure, high cost, poor explosion-proof performance and the like.

Disclosure of Invention

The purpose of the application is: aiming at the problems, the cylindrical battery cap which is simple and ingenious in structure, convenient to assemble and good in explosion-proof performance is provided.

The technical scheme of the application is as follows:

a cylindrical battery cap, comprising:

a top cover, a bottom cover and a top cover,

a bottom plate, a plurality of first connecting plates,

an explosion-proof membrane sandwiched between the top cover and the bottom plate, an

The sealing rubber ring is fixedly sleeved on the top cover, the bottom plate and the periphery of the explosion-proof membrane;

three first pressure relief holes which are arranged in an equilateral triangle shape at three vertexes are penetratingly formed in the bottom plate, and three second pressure relief holes which are arranged in an equilateral triangle shape at three vertexes are penetratingly formed in the top cover.

On the basis of the technical scheme, the application also comprises the following preferable scheme:

the outer contours of the top cover, the bottom plate and the explosion-proof membrane are all circular.

The middle part of the top cover is punched with an upper circular bulge protruding upwards, and the second pressure relief hole is arranged at the outer edge of the upper circular bulge.

The middle part of the bottom plate is punched with a lower circular bulge protruding downwards, and the first pressure relief hole is arranged at the outer edge of the lower circular bulge.

The first pressure relief hole and the second pressure relief hole are arranged in a staggered mode.

The top cover, the bottom plate and the explosion-proof membrane are welded and fixed.

The top cover and the bottom plate are both made of nickel-plated carbon steel.

The explosion-proof membrane is made of copper, nickel, aluminum or stainless steel.

The thickness of the explosion-proof membrane is 0.005-0.02 mm.

The application has the advantages that:

1. this application presss from both sides between top cap and bottom plate and establishes the rupture membrane to all link up on bottom plate and top cap and set up three pressure release hole, when the battery broke down and inside atmospheric pressure sharply risees, high-pressure gas reaches the rupture membrane position at first through the pressure release hole of bottom plate, makes the rupture membrane break under the high-pressure effect, and then makes high-pressure gas discharge from the pressure release hole of top cap, prevents that the explosion from taking place. The battery cap has simple structure and convenient assembly.

2. The first pressure relief hole on the bottom plate and the second pressure relief hole on the top cover are arranged in a staggered mode, so that the possibility that an external object penetrates through the explosion-proof film from the second pressure relief hole and directly enters the battery can be reduced.

3. A cavity is formed between the upper circular bulge in the middle of the top cover and the lower circular bulge in the middle of the bottom plate, and the main body part of the explosion-proof membrane is just positioned in the cavity, so that a space is provided for the rupture deformation of the explosion-proof membrane in a high-pressure state.

Drawings

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

FIG. 1 is a perspective view of a cylindrical battery cap according to an embodiment of the present invention;

FIG. 2 is a side view of a cylindrical battery cap in an embodiment of the present application;

FIG. 3 is a top view of a cylindrical battery cap in an embodiment of the present application;

FIG. 4 is a sectional view taken along line B-B of FIG. 3;

wherein: 1-top cover, 101-second pressure relief hole, 102-upper circular bulge, 2-bottom plate, 201-first pressure relief hole, 202-lower circular bulge, 3-explosion-proof membrane and 4-sealing rubber ring.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.

One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.

Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Fig. 1 to 4 show a preferred embodiment of the cylindrical battery cap of the present application, which comprises a top cover 1, a bottom plate 2, and an explosion-proof membrane 3 sandwiched between the top cover and the bottom plate, wherein a sealing rubber ring 4 is fixedly sleeved on the peripheries of the top cover, the bottom plate and the explosion-proof membrane. Moreover, three first pressure relief holes 201 arranged in an equilateral triangle shape at three vertexes are penetratingly formed in the bottom plate 2, and three second pressure relief holes 101 arranged in an equilateral triangle shape at three vertexes are penetratingly formed in the top cover 1.

In this embodiment, the outer contours of the top cover 1, the bottom plate 2 and the rupture membrane 3 are all circular, an upper circular protrusion 102 protruding upwards is stamped and processed in the middle of the top cover 1, and the three second pressure relief holes 101 are arranged at the outer edge of the upper circular protrusion 102; a lower circular bulge 202 protruding downwards is stamped in the middle of the bottom plate 2, and the three first pressure relief holes 201 are arranged at the outer edge of the lower circular bulge 202.

In order to reduce the possibility that an external object penetrates the rupture disk 3 from the second pressure release hole 101 to enter the battery, the first pressure release hole 201 and the second pressure release hole 101 are arranged in a staggered manner in the embodiment.

Obviously, a cavity is formed between the upper circular projection 102 at the middle part of the top cover 1 and the lower circular projection 202 at the middle part of the bottom plate 2, and the main body part of the rupture disk 3 is just positioned in the cavity to provide a space for rupture deformation of the rupture disk 3 under a high pressure state.

The top cover 1, the bottom plate 2 and the explosion-proof membrane 3 are fixedly connected together by only depending on the tightening force of the sealing rubber ring 4, so that the use requirements are difficult to meet, the top cover 1, the bottom plate 2 and the explosion-proof membrane 3 are welded and fixed in the embodiment, and the welding mode can select laser welding, resistance welding or ultrasonic welding and the like.

In this embodiment, the top cover 1 and the bottom plate 2 are both made of low-cost nickel-plated carbon steel, while the explosion-proof membrane 3 is made of copper (copper membrane), and of course, the material of the explosion-proof membrane 3 may also be nickel, aluminum or stainless steel, and the thickness thereof is generally 0.005-0.02mm, and the specific thickness needs to be determined according to the required explosion venting pressure.

The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.

Claims (9)

1. A cylindrical battery cap, comprising:

a top cover (1),

a bottom plate (2),

an explosion-proof membrane (3) sandwiched between the top cover and the bottom plate, and

a sealing rubber ring (4) fixedly sleeved on the top cover, the bottom plate and the periphery of the explosion-proof membrane;

the base plate (2) is provided with three first pressure relief holes (201) which are arranged on three vertexes of an equilateral triangle in a run-through mode, and the top cover (1) is provided with three second pressure relief holes (101) which are arranged on three vertexes of the equilateral triangle in a run-through mode.

2. The cylindrical battery cap according to claim 1, wherein the outer contours of the top cap (1), the bottom plate (2) and the explosion-proof membrane (3) are all circular.

3. The cylindrical battery cap as claimed in claim 2, characterized in that the middle of the top cap (1) is stamped with an upper circular protrusion (102) protruding upward, and the second pressure relief hole (101) is arranged at the outer edge of the upper circular protrusion (102).

4. The cylindrical battery cap as claimed in claim 2, characterized in that the bottom plate (2) is stamped with a lower circular protrusion (202) protruding downward at the middle thereof, and the first pressure relief hole (201) is arranged at the outer edge of the lower circular protrusion (202).

5. The cylindrical battery cap according to claim 1, wherein the first pressure relief hole (201) is arranged offset from the second pressure relief hole (101).

6. The cylindrical battery cap as claimed in claim 1, wherein the top cap (1), the bottom plate (2) and the rupture disk (3) are welded and fixed.

7. The cylindrical battery cap according to claim 1, wherein the top cover (1) and the bottom plate (2) are both of nickel-plated carbon steel.

8. The cylindrical battery cap as claimed in claim 1, wherein the explosion-proof membrane (3) is made of copper, nickel, aluminum or stainless steel.

9. The cylindrical battery cap as claimed in claim 1, wherein the explosion-proof membrane (3) has a thickness of 0.005-0.02 mm.

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