CN220065858U

CN220065858U - Top cover of battery

Info

Publication number: CN220065858U
Application number: CN202321332213.5U
Authority: CN
Inventors: 周原; 陈博; 毛棉来
Original assignee: Beijing Lanpeng Ruichi Technology Co ltd
Current assignee: Beijing Lanpeng Ruichi Technology Co ltd
Priority date: 2023-05-29
Filing date: 2023-05-29
Publication date: 2023-11-21
Anticipated expiration: 2033-05-29

Abstract

The utility model provides a top cover of a battery, which comprises a top cover plate, a first plastic part, a second plastic part and a pole piece, wherein the top cover plate and the second plastic part are sequentially connected in a stacked manner; the top cover sheet comprises a top cover sheet body and a first protruding part, and the first protruding part protrudes towards the direction away from the second plastic part so as to form a first avoidance cavity on one side of the top cover sheet body facing the second plastic part; the second plastic part comprises a plastic part body and a second protruding portion, the second protruding portion is arranged corresponding to the first protruding portion, and the protruding direction of the second protruding portion is consistent with that of the first protruding portion, so that the second protruding portion is contained in the first avoiding cavity, and the second protruding portion forms a second avoiding cavity on one side, deviating from the top cover plate, of the plastic part body. The top cover of the battery can improve the capacity of the battery.

Description

Top cover of battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a top cover of a battery.

Background

At present, a large amount of new energy technology is applied to the fields of automobiles, heavy trucks, agricultural unmanned aerial vehicles, electric tools and the like, and the power battery has the characteristics of high energy density, long cycle life, no memory effect, environmental friendliness and the like and is widely applied to plug-in hybrid electric vehicles, hybrid electric vehicles and pure electric vehicles.

The power battery comprises a top cover, a shell and an electrolyte, wherein the top cover mainly comprises a top cover plate, upper insulating plastic, lower insulating plastic and a pole, the upper insulating plastic, the top cover plate and the lower insulating plastic are sequentially laminated and bonded together, the top cover plate is connected with the shell, the electrolyte and the electrolyte are packaged in the shell, and the pole sequentially penetrates through the lower insulating plastic, the top cover plate and the upper insulating plastic, so that the electrolyte and an external circuit are connected.

However, the capacity of the power battery in the related art is to be increased.

Disclosure of Invention

Based on this, the present utility model provides a top cover of a battery to solve the shortcomings in the related art.

The utility model provides a top cover of a battery, which comprises a top cover plate, a first plastic part, a second plastic part and a pole piece, wherein the top cover plate and the second plastic part are sequentially connected in a stacked manner;

the top cover sheet comprises a top cover sheet body and a first protruding part which are connected with each other, and the first protruding part protrudes towards the direction deviating from the second plastic part so as to form a first avoidance cavity on one side of the top cover sheet body facing the second plastic part; the second plastic part comprises a plastic part body and a second protruding portion which are connected with each other, the second protruding portion is arranged corresponding to the first protruding portion, and the protruding direction of the second protruding portion is consistent with that of the first protruding portion, so that the second protruding portion is contained in the first avoiding cavity, and the second protruding portion forms a second avoiding cavity on one side, deviating from the top cover plate, of the plastic part body.

In one possible implementation, the top cover of the battery provided by the utility model, the first protrusion is located at a middle region of the top cover sheet.

In one possible implementation manner, the top cover of the battery provided by the utility model has the shape of the first protruding part matched with the shape of the second protruding part.

In one possible implementation manner, the top cover of the battery provided by the utility model has a square projection shape of the first protruding part on the top cover sheet body.

In one possible implementation manner, the top cover of the battery provided by the utility model has the advantages that one surface of the pole piece facing the first protruding part is flush with one surface of the first protruding part, which is away from the second plastic piece;

or, the surface of the pole piece facing the first bulge protrudes out of the surface of the first bulge, which is away from the second plastic piece.

In one possible implementation, the top cover of the battery provided by the utility model has a height difference between the end surface of the pole piece and the end surface of the first protruding part of greater than or equal to 2 millimeters.

In one possible implementation manner, the top cover of the battery provided by the utility model further comprises an explosion-proof piece, the first protruding part is provided with a pressure relief opening, and the explosion-proof piece is connected to the pressure relief opening.

In one possible implementation manner, the top cover of the battery is provided with the third avoidance cavity in the second protruding portion, the third avoidance cavity and the second avoidance cavity are respectively arranged on two opposite sides of the second protruding portion, and the third avoidance cavity is matched with the explosion-proof piece.

In one possible implementation manner, the top cover of the battery is provided with the first liquid injection hole in the first protruding portion, the second protruding portion is provided with the second liquid injection hole, and the first liquid injection hole and the second liquid injection hole are coaxially arranged and are communicated with each other.

In one possible implementation manner, the top cover of the battery provided by the utility model is characterized in that the top cover sheet body is provided with the connecting through hole, the first plastic piece is provided with the first pole hole, the plastic piece body is provided with the second pole hole, the connecting through hole, the first pole hole and the second pole hole are coaxially arranged, the first plastic piece is connected with the connecting through hole in a penetrating way, and the pole pieces sequentially penetrate through the first pole hole and the second pole hole.

The top cover of the battery comprises a top cover plate, a first plastic part, a second plastic part and a pole piece, wherein the top cover plate is used for being connected with a shell of the battery to form a shell of the battery, the pole piece is used for leading out current of a battery core to be connected with an external circuit, the first insulating part and the second insulating part are used for insulating and isolating the top cover plate and the pole piece to avoid short circuit of the battery caused by contact of the top cover plate and the pole piece, the second protruding part is arranged on the second insulating part to form a second avoidance cavity on one side of the second insulating part, which is far away from the top cover plate, so that the internal space of the battery is increased, and the capacity of the battery is improved. Thus, the top cover of the battery of the present utility model increases the capacity of the battery.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a top cover of a battery according to an embodiment of the present utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a left side view of FIG. 1;

FIG. 4 is a schematic view of the construction of the coversheet of FIG. 1;

FIG. 5 is a left side view of FIG. 4;

FIG. 6 is a schematic view of the second insulator of FIG. 1;

fig. 7 is a left side view of fig. 6.

Reference numerals illustrate:

100-top cover sheet; 110-top cover sheet body; 111-connecting through holes; 120-a first boss; 121-a first avoidance chamber; 122-pressure relief vent; 123-a first liquid injection hole;

200-a first plastic part; 210-a first post hole;

300-a second plastic part; 310-plastic part body; 311-second pole holes; 320-a second boss; 321-a second avoidance cavity; 322-a third avoidance chamber; 3221-an air outlet; 323-a second liquid injection hole;

400-pole piece; 410-pole; 420-pole plate;

500-explosion-proof parts;

600-seals;

700-explosion-proof patch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the preferred embodiments of the present utility model will be described in more detail with reference to the accompanying drawings in the preferred embodiments of the present utility model. In the drawings, the same or similar reference numerals refer to the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the utility model. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, indirectly connected through an intermediary, or may be in communication with each other between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship of the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms first, second, third and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented, for example, in sequences other than those illustrated or otherwise described herein.

Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or display that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or display.

The high-capacity power battery can meet more distant endurance and power demands, is suitable for travel demands in various scenes, and has higher travel efficiency. However, the capacity of the power battery in the related art is to be increased.

In view of the above problems, the present utility model provides a top cover of a battery, in which a first protruding portion is disposed on a top cover sheet, and a second protruding portion is disposed on a second plastic member, so that a second avoiding cavity is formed on a side of the second protruding portion, which faces away from the top cover sheet, and the internal space of the battery is increased, thereby improving the capacity of the battery.

The following describes in detail the embodiments of the top cover of the battery provided by the embodiments of the present utility model with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a top cover of a battery according to an embodiment of the present utility model; FIG. 2 is an exploded view of FIG. 1; FIG. 3 is a left side view of FIG. 1; FIG. 4 is a schematic view of the construction of the coversheet of FIG. 1; FIG. 5 is a left side view of FIG. 4; fig. 6 is a schematic structural view of the second insulating member in fig. 1. Referring to fig. 1 to 6, the top cover of the battery provided by the present utility model includes a top cover sheet 100, a first plastic member 200, a second plastic member 300 and a pole piece 400, wherein the top cover sheet 100 and the second plastic member 300 are sequentially stacked and connected, the first plastic member 200 is connected to the top cover sheet 100, and the pole piece 400 sequentially penetrates through the first plastic member 200 and the second plastic member 300 and is connected to the first plastic member 200.

The top cover sheet 100 includes a top cover sheet body 110 and a first protrusion 120 connected to each other, where the first protrusion 120 protrudes in a direction away from the second plastic member 300, so as to form a first avoidance cavity 121 on a side of the top cover sheet body 110 facing the second plastic member 300. The second plastic part 300 comprises a plastic part body 310 and a second protruding portion 320 which are connected with each other, the second protruding portion 320 is arranged corresponding to the first protruding portion 120, and the protruding direction of the second protruding portion 320 is consistent with the protruding direction of the first protruding portion 120, so that the second protruding portion 320 is contained in the first avoiding cavity 121, and the second protruding portion 320 forms a second avoiding cavity 321 on one side, away from the top cover 100, of the plastic part body 310.

It should be noted that the battery may include a housing of the battery, a top cover of the battery, and a battery cell, where the top cover of the battery is connected with the housing of the battery to form a housing of the battery, so as to encapsulate the battery cell and the electrolyte in the housing of the battery, and draw current from the battery cell through the top cover of the battery to be connected with other electrical devices.

Specifically, the top cover of the battery may include a top cover sheet 100, the top cover sheet 100 may be formed by using aluminum material, the housing of the battery may also be formed by using aluminum material, and the top cover sheet 100 is welded to the housing of the battery, thereby jointly forming the housing of the battery.

The battery cell may include a battery cell body and a battery cell tab connected to each other, and the pole piece 400 is used for being connected to the battery cell tab, so as to draw current from the battery cell body through the battery cell tab and the pole piece 400, and be connected to an external circuit through the pole piece 400.

It should be understood that the top cover of the battery may be provided with one pole piece 400, the battery may be provided with two top covers of the battery, and the two top covers of the battery may be provided on adjacent sides of the housing of the battery, or may be provided on opposite sides of the housing of the battery. Alternatively, two pole pieces 400 may be provided on the top cover of one battery at the same time.

The two pole pieces 400 may include a positive pole piece 400 and a negative pole piece 400, among others.

The first plastic member 200 and the second plastic member 300 are used for insulating and isolating the top cover plate 100 and the pole piece 400, so as to avoid the contact between the pole piece 400 and the top cover plate 100, thereby causing short circuit of the battery.

After the top cover sheet 100, the first plastic member 200, the second plastic member 300 and the pole piece 400 are assembled to form the top cover of the integral battery, and the top cover of the battery is assembled to the shell of the battery, the top cover sheet 100 is located at the outer side of the battery, the second plastic member 300 is located at the inner side of the battery, since the top cover sheet 100 is provided with the first protruding portion 120, the first protruding portion 120 protrudes towards the outer side of the battery, and the first avoiding cavity 121 is formed at the inner side of the top cover sheet 100, the second plastic member 300 can be provided with the second protruding portion 320, the second protruding portion 320 also protrudes towards the outer side of the battery, so that the first avoiding cavity 121 can avoid the second protruding portion 320, the second protruding portion 320 can form the second avoiding cavity 321 at the inner side of the second plastic member 300, and the second avoiding cavity 321 can increase the inner space of the battery, thereby improving the capacity of the battery.

The top cover of the battery provided by the embodiment of the utility model comprises a top cover plate 100, a first plastic part 200, a second plastic part 300 and a pole piece 400, wherein the top cover plate 100 is used for being connected with a shell of the battery to form a shell of the battery, the pole piece 400 is used for leading out current of a battery core to be connected with an external circuit, a first insulating part and a second insulating part are arranged for insulating and isolating the top cover plate 100 and the pole piece 400 to avoid short circuit of the battery caused by contact of the top cover plate 100 and the pole piece 400, a second bulge part 320 is arranged on the second insulating part to form a second avoidance cavity 321 on the side, facing away from the top cover plate 100, of the second insulating part, so that the internal space of the battery is increased, the capacity of the battery is increased, and a first bulge part 120 is arranged on the top cover plate 100 to form a first avoidance cavity 121 on the side, facing the second insulating part, of the top cover plate 100, so that the second bulge part 320 is accommodated in the first avoidance cavity 121, and the structure of the top cover of the battery is more compact. Thus, the top cover of the battery of the present utility model increases the capacity of the battery.

To facilitate the arrangement of the pole piece 400, in one possible implementation, the first boss 120 is located in a central region of the top cover sheet 100.

In this way, the first boss 120 is located at the middle region of the top cover sheet 100, and the top cover sheet body 110 is located at both side regions of the top cover sheet 100, so that the pole piece 400 and the first plastic piece 200 are conveniently arranged at the top cover sheet body 110.

For example, when two pole pieces 400 are both disposed on the top cover of the same battery, the first protrusion 120 is disposed in the middle of the top cover sheet 100, and the two pole pieces 400 are disposed on the plastic piece bodies 310 on both sides of the first protrusion 120.

In order to make the structure of the top cover of the battery compact, in some embodiments, the shape of the first protrusion 120 is matched to the shape of the second protrusion 320.

By this arrangement, the shape of the first relief cavity 121 can be matched with the shape of the second protruding portion 320, and the second protruding portion 320 can be completely accommodated in the first relief cavity 121.

The shape of the first protruding portion 120 may be circular, elliptical, square, etc., and the shape of the second protruding portion 320 may be circular, elliptical, square, etc.

As an alternative embodiment, the projection shape of the first boss 120 on the top cover sheet body 110 is square.

Because the overall shape of the top cover sheet 100 and the second plastic member 300 is square, the shapes of the first protruding portion 120 and the second protruding portion 320 are set to be square, so that the first avoidance cavity 121 with larger space is formed on the top cover sheet 100, the second avoidance cavity 321 with larger space is formed on the second plastic member 300, the internal space of the battery is further enlarged, the structures such as the pressure relief opening 122, the first liquid injection hole 123 and the like are conveniently arranged on the first protruding portion 120, and the structures such as the third avoidance cavity 322 and the second liquid injection hole 323 are conveniently arranged on the second protruding portion 320.

Because of the need to connect multiple cells in series or in parallel, in order not to interfere with the connection of the cells, in some embodiments, the side of the pole piece 400 facing the first boss 120 is flush with the side of the first boss 120 facing away from the second plastic piece 300.

Alternatively, in other embodiments, the side of the pole piece 400 facing the first protrusion 120 protrudes from the side of the first protrusion 120 facing away from the second plastic piece 300.

That is, as long as the height of the pole piece 400 facing the first protrusion 120 is not lower than the height of the first protrusion 120 facing away from the second plastic piece 300, the pole pieces 400 of the respective batteries cannot be smoothly connected due to interference of the first protrusion 120 when being connected.

In some embodiments, the difference in height between the end face of the pole piece 400 and the end face of the first boss 120 is greater than or equal to 2 millimeters.

In this way, the end face of the pole piece 400 is arranged to be slightly higher than the end face of the first boss 120, and the end face of the pole piece 400 is arranged to be 2 mm or more higher than the end face of the first boss 120, which is more advantageous for series connection or parallel connection of a plurality of batteries.

Referring to fig. 1, 2, 4 and 5, in one possible implementation, the top cover of the battery provided by the embodiment of the present utility model further includes an explosion-proof component 500, where the first protruding portion 120 is provided with a pressure relief opening 122, and the explosion-proof component 500 is connected to the pressure relief opening 122.

It can be understood that during the manufacturing and using process of the battery, gas can be generated in the battery, and under the condition of good tightness, the internal pressure of the battery is too high, and if the pressure is not discharged in time, the explosion and the fire are dangerous.

Therefore, by disposing the explosion-proof member 500 on the top cover of the battery and welding the explosion-proof member 500 to the pressure relief opening 122 of the first protrusion 120, the explosion-proof member 500 can close the pressure relief opening 122 in a normal state to avoid leakage of the electrolyte. When the pressure inside the battery reaches a certain level, the explosion-proof member 500 explodes to open the pressure release opening 122, so that the gas inside the battery flows out from the gas release opening, thereby reducing the pressure inside the battery.

Fig. 7 is a left side view of fig. 6. Referring to fig. 6 and fig. 7, it should be noted that, after the explosion-proof member 500 is welded to the pressure relief opening 122, one surface of the explosion-proof member 500 facing the second plastic member 300 protrudes relative to the bottom wall of the first avoidance cavity 121, in order to avoid the explosion-proof member 500, in one possible implementation manner, the second protrusion 320 is provided with the third avoidance cavity 322, the third avoidance cavity 322 and the second avoidance cavity 321 are respectively disposed on two opposite surfaces of the second protrusion 320, and the third avoidance cavity 322 is disposed in matching with the explosion-proof member 500.

Therefore, after the explosion-proof member 500 is welded to the pressure relief opening 122, the portion of the explosion-proof member 500 protruding toward the bottom wall of the first avoidance cavity 121 facing the second plastic member 300 may be received in the third avoidance cavity 322, so as to avoid interference between the explosion-proof member 500 and the second protrusion 320, which may cause the top cover of the battery to be unable to be assembled smoothly.

When specifically setting up, the position and the shape of chamber 322 all can be dodged with explosion-proof piece 500 to the third dodges the chamber 322 and can dodge the explosion-proof piece 500 completely, can also increase the second and dodge the space in chamber 321, and then increase the inner space of battery to improve the capacity of battery.

The bottom wall of the third avoidance cavity 322 may be provided with a plurality of air outlet holes 3221, so that the air inside the battery flows to the outside of the battery through the air outlet holes 3221 and the pressure relief opening 122.

Referring to fig. 4 to 7, in order to facilitate injection of an electrolyte into the battery, in some embodiments, the first boss 120 is provided with a first injection hole 123, and the second boss 320 is provided with a second injection hole 323, and the first injection hole 123 and the second injection hole 323 are coaxially disposed and communicate with each other.

Thus, after the top cover of the battery is assembled and welded to the case of the battery through the top cover sheet 100, other parts of the case of the battery except the first and second filling holes 123 and 323 are in a sealed state, and then the electrolyte can be filled into the battery through the first and second filling holes 123 and 323, and then the first filling hole 123 is sealed by the sealing member, so that the battery cell and the electrolyte are completely sealed inside the battery. Referring to fig. 2 and fig. 4 to 7, in some embodiments, the top cover sheet body 110 is provided with a connection through hole 111, the first plastic member 200 is provided with a first post hole 210, the plastic member body 310 is provided with a second post hole 311, the connection through hole 111, the first post hole 210 and the second post hole 311 are coaxially arranged, the first plastic member 200 is connected to the connection through hole 111 in a penetrating manner, and the post member 400 sequentially penetrates through the first post hole 210 and the second post hole 311.

Thus, the first plastic member 200 may be connected to the top cover sheet body 110 through the connection through hole 111, so that the first plastic member 200 is connected to the top cover sheet 100, and then the top cover sheet 100 and the second plastic member 300 are connected in a stacked manner, and then the pole member 400 sequentially penetrates through the second pole hole 311 and the first pole hole 210 and is connected to the first pole hole 210, so that the pole member 400 is connected to the first plastic member 200, and therefore, the top cover sheet 100, the first plastic member 200, the second plastic member 300 and the pole member 400 may be connected together, and the first plastic member 200 and the second plastic member 300 may be insulated to isolate the top cover sheet 100 and the pole member 400.

Referring to fig. 2, specifically, the pole piece 400 may include a pole 410 and a pole plate 420 that are connected to each other, where the pole plate 420 is located at one end of the pole 410, which is away from the first plastic piece 200, and the pole 410 sequentially penetrates through the second plastic and the first plastic piece 200 and is connected to the first plastic piece 200.

With continued reference to fig. 2, it should be noted that the top cover of the battery may further include a sealing member 600, where the sealing member 600 is disposed between the pole 410 and the second pole hole 311 to seal the gap between the pole 410 and the second pole hole 311. Wherein the seal 600 may be a sealing ring.

Wherein, after the explosion proof member 500 is welded to the top cap sheet 100, the first plastic member 200, the second plastic member 300, the pole piece 400 and the sealing member 600 may be coupled together by injection molding.

In addition, as shown in fig. 2, an explosion-proof patch 700 may be attached to a side of the explosion-proof member 500 facing away from the second plastic member 300.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims

1. The top cover of the battery is characterized by comprising a top cover plate, a first plastic part, a second plastic part and a pole piece, wherein the top cover plate and the second plastic part are sequentially connected in a stacked mode, the first plastic part is connected with the top cover plate, and the pole piece is sequentially arranged on the first plastic part and the second plastic part in a penetrating mode and is connected with the first plastic part;

the top cover sheet comprises a top cover sheet body and a first protruding part which are connected with each other, and the first protruding part protrudes towards the direction away from the second plastic part so as to form a first avoidance cavity on one side of the top cover sheet body facing the second plastic part; the second plastic part comprises a plastic part body and a second protruding portion which are connected with each other, the second protruding portion is arranged corresponding to the first protruding portion, the protruding direction of the second protruding portion is consistent with that of the first protruding portion, the second protruding portion is contained in the first avoiding cavity, and the second protruding portion is in the position, away from the top cover piece, of the plastic part body to form a second avoiding cavity.

2. The battery top cover of claim 1, wherein the first boss is located in a central region of the top cover sheet.

3. The battery top cover of claim 1, wherein the shape of the first protrusion is configured to match the shape of the second protrusion.

4. The battery top cover according to claim 3, wherein the projected shape of the first protruding portion on the top cover sheet body is square.

5. The battery top cover of any one of claims 1-4, wherein a face of the pole piece facing the first boss is flush with a face of the first boss facing away from the second plastic piece;

or, the surface of the pole piece, which faces the first protruding part, protrudes out of the surface, away from the second plastic piece, of the first protruding part.

6. The battery top cover of claim 5, wherein a difference in height between an end surface of the pole piece and an end surface of the first boss is greater than or equal to 2 millimeters.

7. The battery top cover of any one of claims 1-4, further comprising an explosion-proof member, wherein the first boss is provided with a pressure relief vent, and wherein the explosion-proof member is connected to the pressure relief vent.

8. The battery top cover according to claim 7, wherein the second protruding portion is provided with a third avoidance cavity, the third avoidance cavity and the second avoidance cavity are respectively arranged on two opposite sides of the second protruding portion, and the third avoidance cavity is matched with the explosion-proof piece.

9. The battery top cover of any one of claims 1-4, wherein the first protrusion is provided with a first liquid injection hole, the second protrusion is provided with a second liquid injection hole, and the first liquid injection hole and the second liquid injection hole are coaxially arranged and are communicated with each other.

10. The battery top cover according to any one of claims 1-4, wherein the top cover sheet body is provided with a connecting through hole, the first plastic member is provided with a first pole hole, the plastic member body is provided with a second pole hole, the connecting through hole, the first pole hole and the second pole hole are coaxially arranged, the first plastic member is connected to the connecting through hole in a penetrating manner, and the pole member is sequentially connected to the first pole hole and the second pole hole in a penetrating manner.