CN221239742U - Battery cover and battery - Google Patents

Abstract

The application discloses a battery cover and a battery. The battery cover comprises a cover body, a ventilated membrane and an explosion-proof thimble. The cover body is provided with ventilation holes and mounting holes; the ventilation film is arranged on the cover body and covers the ventilation holes; the explosion-proof thimble is movably arranged in the mounting hole so as to adjust the distance between the explosion-proof thimble and the breathable film. According to the battery, the explosion-proof ejector pin capable of moving along the mounting hole is arranged, so that the distance between the explosion-proof ejector pin and the breathable film can be adjusted, and further, battery structures with different types and different explosion-proof requirements can be met. Compared with the mode that different types of explosion-proof ventilation valves are required to be designed for batteries of different types in the prior art, the battery cover structure can be universally used in battery structures of different types and different explosion-proof requirements, and the production and manufacturing cost of the battery can be effectively reduced.

Description

Battery cover and battery

Technical Field

The application relates to the technical field of charge and discharge devices, in particular to a battery cover and a battery.

Background

The lithium ion battery does not contain toxic substances and is a green high-energy chemical power supply. The lithium ion battery has the advantages of light weight, large specific energy, long cycle life, wide allowable working temperature range, good low-temperature performance and the like, and has been widely applied to industries such as digital electronic products, electric automobiles and the like.

At present, an explosion-proof ventilation valve used on a top cover of a lithium ion battery mainly comprises a ventilation film and a thimble, and in actual use, the ventilation film is pierced by the thimble on the battery so as to achieve the purpose of explosion prevention. However, for different models of lithium ion batteries, lithium ion batteries are required to have different explosion-proof capabilities. If the structure of the transmission ventilation film and the thimble is adopted, the explosion-proof ventilation valves of different types are required to be designed aiming at lithium ion batteries of different types, and the production and manufacturing cost of the batteries are easy to increase.

Disclosure of utility model

The application provides a battery cover and a battery, which at least solve the problem of high production and manufacturing cost of the battery in the prior art.

According to an aspect of the present application, there is provided a battery cover including:

The cover body is provided with ventilation holes and mounting holes;

the breathable film is arranged on the cover body and covers the ventilation holes; and

The explosion-proof thimble is movably arranged in the mounting hole to adjust the distance between the explosion-proof thimble and the breathable film.

Further, the mounting hole comprises a threaded hole, and the ventilation holes are formed in the periphery of the threaded hole;

The anti-explosion thimble comprises a stud section and a thimble section, wherein the stud section is arranged in the threaded hole, and the thimble section is arranged at the end part of the stud section.

Further, the explosion-proof thimble further comprises a stop block, the stop block is arranged at one end of the stud section, which is opposite to the thimble section, a gap is reserved between the stop block and the air vent, and the projection of the air vent along the axis direction of the threaded hole is positioned in the projection of the stop block along the axis direction of the threaded hole.

Further, the stop block comprises a hexagonal prism block, and the stud segment is connected to the hexagonal prism block.

Further, the stop block further comprises a structural reinforcement block, the structural reinforcement block is located between the stud segment and the hexagonal prism block, and the stud segment is connected to the structural reinforcement block.

Further, the thimble section comprises a cone, the maximum cross section of the cone is the same as the cross section of the stud section, and the cross section of the cone gradually becomes smaller along the direction away from the stud section.

Further, the number of the ventilation holes is multiple, and the ventilation holes are arranged at intervals along the periphery of the mounting hole.

Further, the cover body is provided with a convex column, the convex column extends along the X direction of the cover body, and the air holes and the mounting holes are formed in the convex column.

Further, the convex column comprises a cylindrical convex column, and the air holes are circular arc-shaped and are arranged on the periphery of the mounting hole in a surrounding mode.

Further, along the ventilation direction of the ventilation holes, the area of the cross section of the ventilation holes gradually becomes larger.

On the other hand, the application also provides a battery, which comprises a battery cover, wherein the battery cover is the battery cover.

Compared with the prior art, the technical scheme of the application has at least the following technical effects:

Because the explosion-proof thimble is movably installed in the mounting hole, when the explosion-proof thimble moves along the mounting hole to move towards the direction away from the air-permeable membrane, the distance between the air-permeable membrane and the explosion-proof thimble becomes large, and when the internal pressure of the battery is high enough, the air-permeable membrane can be propped open to be contacted with the explosion-proof thimble so as to be propped up by the explosion-proof thimble. At this time, the gas or substances in the battery can be discharged from the vent holes, thereby achieving the purpose of explosion prevention. That is, when the explosion-proof thimble is moved along the mounting hole to move in a direction away from the gas permeable membrane, the battery cover can satisfy a battery structure in which the explosion-proof capability requirement of the battery is weak.

When the explosion-proof thimble moves along the mounting hole to move towards the direction close to the air-permeable film, the distance between the air-permeable film and the explosion-proof thimble is reduced, and when the internal pressure of the battery is smaller, the air-permeable film can be expanded to be contacted with the explosion-proof thimble so as to be burst by the explosion-proof thimble. At this time, the gas or substances in the battery can be discharged from the vent holes, thereby achieving the purpose of explosion prevention. That is, when the explosion-proof thimble is moved along the mounting hole to move toward the direction approaching to the air-permeable membrane, the battery cover can meet the battery structure with higher explosion-proof capability requirement of the battery.

Therefore, the anti-explosion thimble capable of moving along the mounting hole is arranged, so that the distance between the anti-explosion thimble and the breathable film can be adjusted, and further, the battery structure with different types and different anti-explosion requirements can be met. Compared with the mode that different types of explosion-proof ventilation valves are required to be designed for batteries of different types in the prior art, the battery cover structure can be universally used in battery structures of different types and different explosion-proof requirements, and the production and manufacturing cost of the battery can be effectively reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a schematic view of a battery cover according to the present disclosure;

Fig. 2 is an enlarged view of the region M in fig. 1;

Fig. 3 is a first partial enlarged view of a battery cover according to an embodiment of the present application;

Fig. 4 is a second partial enlarged view of a battery cover according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

10. A cover body; 11. a convex column; 101. ventilation holes; 102. a mounting hole; 20. a breathable film; 30. an explosion-proof thimble; 31. a stud section; 32. a thimble section; 33. a stop block; 331. hexagonal prism blocks; 332. structural reinforcing blocks.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 4, according to an embodiment of the present application, there is provided a battery including a case (not shown), a battery cell (not shown), and a battery cover. Wherein, the electric core is installed in the shell, and battery cover lid is established on the shell in order to install the inside at the shell with electric core seal. In the in-service use process, the battery can take place phenomena such as thermal expansion, and when the battery expands to a certain extent, the pressure in the battery can become great, takes place potential safety hazards such as battery explosion easily. In order to prevent explosion and other phenomena of the battery, the battery cover is provided with an explosion-proof ventilation valve and other structures. As described in the background art, batteries of different types are required to have different explosion-proof capacities, and the conventional explosion-proof ventilation valve is difficult to adapt to batteries of different types, and the production cost and the manufacturing cost of the batteries are easily increased. Therefore, the application provides a novel battery cover, and the specific structure of the battery cover will be described in detail.

The battery cover comprises a cover body 10, a ventilation film 20 and an explosion-proof thimble 30.

Wherein, the cover body 10 is provided with ventilation holes 101 and mounting holes 102; the ventilation film 20 is arranged on the cover body 10 and covers the ventilation holes 101; the flameproof spike 30 is movably installed in the installation hole 102 to adjust the interval between the flameproof spike 30 and the air permeable membrane 20.

In the present application, since the explosion-proof spike 30 is movably installed in the installation hole 102, when the explosion-proof spike 30 is moved along the installation hole 102 to move in a direction away from the gas permeable membrane 20, the distance between the gas permeable membrane 20 and the explosion-proof spike 30 becomes large, and when the internal pressure of the battery is sufficiently high, the gas permeable membrane 20 can be opened to be in contact with the explosion-proof spike 30 to be burst by the explosion-proof spike 30. At this time, the gas or substance in the battery can be discharged from the vent hole 101, thereby achieving the purpose of explosion protection. That is, the battery cover can satisfy a battery structure in which the explosion-proof capability requirement of the battery is weak when the explosion-proof pin 30 is moved along the mounting hole 102 to move in a direction away from the gas permeable membrane 20.

When the explosion-proof ejector pin 30 is moved along the mounting hole 102 to move in a direction approaching the gas permeable membrane 20, the distance between the gas permeable membrane 20 and the explosion-proof ejector pin 30 becomes smaller, and when the internal pressure of the battery is relatively small, the gas permeable membrane 20 can be spread to be in contact with the explosion-proof ejector pin 30 and be broken by the explosion-proof ejector pin 30. At this time, the gas or substance in the battery can be discharged from the vent hole 101, thereby achieving the purpose of explosion protection. That is, the battery cover can satisfy a battery structure having a relatively high explosion-proof capability requirement of the battery when the explosion-proof pin 30 is moved along the mounting hole 102 to move toward a direction approaching the gas permeable membrane 20.

In summary, it can be known that the distance between the explosion-proof thimble 30 and the ventilation membrane 20 can be adjusted by arranging the explosion-proof thimble 30 capable of moving along the mounting hole 102, so that the battery structure with different types and different explosion-proof requirements can be met. Compared with the mode that different types of explosion-proof ventilation valves are required to be designed for batteries of different types in the prior art, the battery cover structure can be universally used in battery structures of different types and different explosion-proof requirements, and the production and manufacturing cost of the battery can be effectively reduced.

Specifically, the cover 10 in this embodiment is a plate-like structure, and the plate-like structure may be a rectangular plate-like structure, a circular plate-like structure, an oval plate-like structure, or another special-shaped plate-like structure, and the design choice is specifically made according to the shape of the battery, and the present application is not limited thereto. The cover body 10 is provided with the cavity near one side of electric core, and mounting hole 102 and bleeder vent 101 all set up on the lateral wall of cavity, and ventilation membrane 20 sets up in the inside of cavity and covers bleeder vent 101, when the inside pressure of battery increases to a certain extent, can prop open ventilation membrane 20 towards the installation at explosion-proof thimble 30 in order to be punctured with explosion-proof thimble 30 contact.

Further, the mounting hole 102 includes a screw hole, and the ventilation hole 101 is provided at the outer circumference of the screw hole; the explosion-proof thimble 30 comprises a stud segment 31 and a thimble segment 32, the stud segment 31 is arranged in the threaded hole, and the thimble segment 32 is arranged at the end part of the stud segment 31. During actual assembly, the stud segments 31 are enabled to rotate along the threaded holes, the thimble segments 32 can be driven to move towards the direction close to or far away from the breathable film 20, and then the distance between the explosion-proof thimble 30 and the breathable film 20 can be adjusted. Optionally, the thimble section 32 and the stud section 31 in the embodiment are integrally formed, so that the structure strength is high and the stability is good. Of course, in other embodiments of the present application, a limiting rack is disposed on the inner wall of the mounting hole 102, and a mating rack that mates with the limiting rack is disposed on the anti-explosion thimble 30. During actual installation, an external force is applied to the explosion-proof thimble 30, and the matched racks on the explosion-proof thimble 30 slide to different positions in the length direction of the limiting racks along the limiting racks so as to limit the explosion-proof thimble 30, so that the distance between the explosion-proof thimble 30 and the ventilation film 20 is adjusted.

Optionally, the thimble section 32 comprises a cone, the largest cross section of which is the same as the cross section of the stud section 31, and the cross section of which tapers in a direction away from the stud section 31. The cross section of the cone and the stud segment 31 in the present application refers to a cross section obtained by cutting the cone and the stud segment 31 in a direction perpendicular to the axis of the stud segment 31. In the present application, the spike section 32 tapers and tapers in a direction away from the stud section 31 to facilitate bursting of the vented membrane 20. In addition, the maximum cross section of the cone is the same as the cross section of the stud segment 31, and during machining, only the end part of the stud segment 31 is required to be milled to form a cone structure, so that the structure is simple and the machining is convenient. Of course, in other embodiments of the present application, the ejector pin segment 32 may be an elongated structure with a constant cross section, and any other modification within the spirit of the present application is within the scope of the present application.

Further, the anti-explosion thimble 30 in the application further comprises a stop block 33, wherein the stop block 33 is arranged at one end of the stud segment 31 opposite to the thimble segment 32, a gap is arranged between the stop block 33 and the air hole 101, and the projection of the air hole 101 along the axis direction of the threaded hole is positioned in the projection of the stop block 33 along the axis direction of the threaded hole. In this embodiment, the stop block 33 is disposed at one end of the stud segment 31 away from the thimble segment 32, and the stop block 33 can cover the end of the air hole 101, so as to prevent external dust, impurities and the like from entering the air hole 101 into the battery to a certain extent. Meanwhile, a gap is formed between the stop block 33 and the air hole 101, the stop block 33 does not seal the air hole 101, and gas or substances in the battery can be conveniently discharged from the gap between the air hole 101 and the stop block 33 when the battery fails.

Optionally, the stop block 33 includes a hexagonal block 331, and the stud segment 31 is connected to the hexagonal block 331. In this embodiment, the hexagonal prism block 331 is more convenient for using a wrench or other structure to apply force to the explosion-proof thimble 30 to mount the explosion-proof thimble 30 in the threaded hole. Of course, in other embodiments of the present application, the hexagonal block 331 may have a structure of a quadrangular block, a triangular block, an elliptic block, or the like, and any other modification forms under the concept of the present application are within the scope of the present application.

Further, the stopper 33 further includes a structural reinforcement block 332, and the structural reinforcement block 332 is located between the stud segment 31 and the hexagonal block 331, and the stud segment 31 is connected to the structural reinforcement block 332. Through the effect of this structure reinforcing piece 332, can increase the thickness of whole backstop piece 33, can improve the structural strength of whole explosion-proof thimble 30, avoid the outer structure striking explosion-proof thimble 30 to cause the battery to become invalid or strike and break explosion-proof thimble 30. Alternatively, the structural reinforcement block 332 may be a cylindrical block, a prismatic block, an oval block, or a shaped block of other shapes, as long as it is within the scope of the present application in other variations contemplated by the present application.

Further, the ventilation holes 101 in the present embodiment are plural, and the plural ventilation holes 101 are arranged at intervals along the outer circumference of the mounting hole 102. The ventilation holes 101 may be two, three, or more than three, for example. Fig. 2 of the present application shows a case where the number of ventilation holes 101 is three. In this embodiment, the ventilation holes 101 are provided in a plurality, so that the substances such as gas inside the battery can be discharged to the outside of the battery quickly, and the use safety of the battery in this embodiment can be improved.

Further, along the exhaust direction of the ventilation hole 101, the area of the cross section of the ventilation hole 101 becomes gradually larger, and it is understood that the cross section of the ventilation hole 101 refers to the cross section obtained by cutting the ventilation hole 101 along the direction perpendicular to the axis of the ventilation hole 101.

Further, the cover 10 in this embodiment is provided with a boss 11, the boss 11 extends along the X direction of the cover 10, and the ventilation holes 101 and the mounting holes 102 are all disposed on the boss 11. It can be understood that the X direction of the cover 10 in this embodiment refers to the length direction of the cover 10, that is, the boss 11 protrudes from the side wall of the cover 10, and the ventilation holes 101 and the mounting holes 102 are arranged on the boss 11, so that the structure is simple and the processing and the forming are more convenient.

Optionally, the protruding pillar 11 in this embodiment includes a cylindrical protruding pillar, and the air hole 101 is circular arc and encloses to establish in the periphery of mounting hole 102, so set up, can enlarge the flow area of air hole 101 to a certain extent, and then can be with the inside gaseous class material of battery quick exhaust when the battery loses efficacy. Of course, in other embodiments of the present application, the protruding pillar 11 may have a prism, an elliptic pillar, or the like, and the mounting hole 102 may have a round hole, a square hole, or the like, so long as other modifications are within the scope of the present application.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A battery cover, comprising:

The cover body (10), the cover body (10) is provided with ventilation holes (101) and mounting holes (102);

A ventilation film (20), wherein the ventilation film (20) is arranged on the cover body (10) and covers the ventilation holes (101); and

The explosion-proof thimble (30) is movably arranged in the mounting hole (102) so as to adjust the distance between the explosion-proof thimble (30) and the breathable film (20).

2. The battery cover according to claim 1, wherein the mounting hole (102) includes a screw hole, and the ventilation hole (101) is provided at an outer periphery of the screw hole;

The explosion-proof thimble (30) comprises a stud section (31) and a thimble section (32), the stud section (31) is installed in the threaded hole, and the thimble section (32) is arranged at the end part of the stud section (31).

3. The battery cover according to claim 2, wherein the explosion-proof ejector pin (30) further comprises a stopper block (33), the stopper block (33) is disposed at an end of the stud segment (31) opposite to the ejector pin segment (32), a gap is provided between the stopper block (33) and the vent hole (101), and a projection of the vent hole (101) in the screw hole axis direction is located in a projection of the stopper block (33) in the screw hole axis direction.

4. A battery cover according to claim 3, wherein the stop block (33) comprises a hexagonal block (331), the stud segments (31) being connected to the hexagonal block (331).

5. The battery cover according to claim 4, wherein the stop block (33) further comprises a structural reinforcement block (332), the structural reinforcement block (332) being located between the stud segment (31) and the hexagonal block (331), the stud segment (31) being connected to the structural reinforcement block (332).

6. Battery cover according to claim 2, characterized in that the ejector pin section (32) comprises a cone, the largest cross section of which is the same as the cross section of the stud section (31), and the cross section of which tapers in a direction away from the stud section (31).

7. The battery cover according to any one of claims 1 to 6, wherein the ventilation holes (101) are plural, and the ventilation holes (101) are provided at intervals along the outer periphery of the mounting hole (102).

8. The battery cover according to claim 7, wherein a boss (11) is provided on the cover body (10), the boss (11) extends along the X direction of the cover body (10), and the ventilation holes (101) and the mounting holes (102) are both provided on the boss (11).

9. The battery cover according to claim 8, wherein the boss (11) comprises a cylindrical boss, and the ventilation holes (101) are circular-arc-shaped and are formed around the outer periphery of the mounting hole (102).

10. The battery cover according to any one of claims 1 to 6, wherein the cross-sectional area of the vent hole (101) becomes gradually larger along the ventilation direction of the vent hole (101).

11. A battery comprising a battery cover as claimed in any one of claims 1 to 10.