CN220585339U - Cover plate and single battery with same - Google Patents

Abstract

The utility model belongs to the field of batteries, and relates to a cover plate and a single battery with the same. The problem of current large capacity battery's metal seal membrane produces metal piece in opening the in-process, leads to the battery short circuit is overcome. The sealing device comprises a cover plate main body, wherein a sealing component is arranged on the cover plate main body; the cover plate main body is provided with a first through hole and at least one second through hole; the sealing component is a nonmetal injection molding piece and is at least partially molded in the first through hole and the second through hole to seal the first through hole and the second through hole; under the action of external force, the sealing component can fall off from the cover plate main body or form a first opening penetrating through the first through hole on the sealing component. And a sealing component made of nonmetal materials is formed at the first through hole and the second through hole of the cover plate main body by adopting an injection molding process, so that the battery is not short-circuited in the opening process. Simultaneously, can fix sealing component in first through-hole and second through-hole department through once moulding plastics, realize the sealed of first through-hole and second through-hole, simple process, the yield is higher.

Description

Cover plate and single battery with same

Technical Field

The utility model belongs to the field of batteries, and particularly relates to a cover plate and a single battery with the same.

Background

In the market, a plurality of single batteries are connected in parallel or in series to form a large-capacity battery (also called a battery module or a battery pack).

However, in the existing large-capacity battery, each single battery has a difference, and due to the existence of the barrel effect, the single battery with the worst performance is often affected, so that the upper limit of the capacity and the cycle number of the whole large-capacity battery are extremely limited. Therefore, how to improve the uniformity of each single battery in the large-capacity battery becomes an important point and a difficult point of research in the field.

In order to solve the above problems, chinese patent CN115036624a proposes a high-capacity battery, wherein the battery case includes an upper cover assembly, a case body and a liquid injection assembly; the shell body is provided with an opening communicated with the inner cavity of the shell body; the liquid injection assembly comprises a connecting pipe and a sealing film, wherein the connecting pipe is arranged on the shell body and is communicated with the inner cavity of the shell body through an opening; the sealing film is arranged in the opening of the shell body or in the connecting pipe so as to seal the battery shell; when electrolyte is injected from the outside of the battery shell to the inside through the electrolyte injection assembly, the sealing film is opened through external acting force, so that the electrolyte enters the inside of each battery shell, and the electrolytes in the battery shells are mutually circulated, so that the batteries are in a uniform electrolyte system, the consistency of the electrolyte performance in the batteries is ensured, and the performance and the service life of the batteries are improved. However, when the sealing film is made of a metal such as copper or aluminum, metal scraps are generated during the opening process, and the scraps adhere between the positive electrode and the negative electrode along with the flow of the electrolyte, so that the battery may be short-circuited.

Disclosure of Invention

The utility model aims to provide a cover plate and a single battery with the same, and solve the problem that metal scraps are generated in the opening process of a metal sealing film of the existing high-capacity battery, so that the battery is short-circuited.

The technical scheme of the utility model is to provide a cover plate, which comprises a cover plate main body and is characterized in that: the sealing assembly is arranged on the cover plate main body;

the cover plate main body is provided with a first through hole and at least one second through hole;

the sealing component is a nonmetal injection molding piece and is at least partially molded in the first through hole and the second through hole to seal the first through hole and the second through hole;

under the action of external force, the sealing assembly can fall off from the cover plate main body or form a first opening penetrating through the first through hole in the sealing assembly.

Further, the sealing component is made of polypropylene.

Further, the first through hole and the second through hole are step holes;

the large hole of the first through hole is formed close to the outer surface of the cover plate main body;

the second through hole is positioned in the peripheral area of the small hole of the first through hole, and the large hole of the second through hole is arranged close to the inner surface of the cover plate main body;

the sealing assembly comprises a first sealing part and a second sealing part which are connected with each other, at least one part of the first sealing part is formed in the first through hole to seal the first through hole and the second through hole, and the second sealing part is formed in the second through hole and is used for fixing the first sealing part on the cover plate main body;

under the action of external force, the sealing assembly can fall off from the cover plate main body or form a first opening penetrating through the small hole of the first through hole on the sealing assembly.

Further, the second through holes are a plurality of and uniformly distributed in the peripheral area of the small holes of the first through holes.

Further, the sealing assembly further comprises a columnar traction part; a first annular groove is formed in the first sealing part;

the columnar traction part protrudes out of the first sealing part, is integrally arranged with the first sealing part and is positioned in the first annular groove ring positioning area; the columnar traction part is provided with a second opening penetrating along the radial direction of the column;

the traction part tears the first sealing part from the first annular groove under the action of external force, and a first opening penetrating through the small hole of the first through hole is formed in the first sealing part.

Further, the sealing assembly further comprises a hollow member, wherein one end of the hollow member is an open end, and the other end of the hollow member is a closed end;

the hollow component is fixedly connected with the first sealing part through the open end and is communicated with the small hole of the first through hole (11);

the outer wall close to the closed end of the hollow member is provided with a second annular groove extending along the circumferential direction of the hollow member, and the closed end can be opened along the second annular groove under the action of external force to form a first opening penetrating through the small hole of the first through hole.

Further, the first through hole and the second through hole are straight holes;

the sealing assembly comprises a third sealing part, a fourth sealing part, a fifth sealing part and a sixth sealing part which are connected with each other;

the third sealing part is formed in the first through hole;

the fourth sealing part covers the outer surface area of the cover plate main body around the first through hole;

the fifth sealing part is formed in the second through hole;

the sixth sealing part covers the inner surface area of the cover plate main body around the second through hole;

under the action of external force, the sealing assembly can fall off from the cover plate main body or form a first opening penetrating through the first through hole in the sealing assembly.

Further, the sealing assembly further comprises a columnar traction part; the third sealing part is provided with a first annular groove;

the columnar traction part protrudes out of the third sealing part and is integrally arranged with the third sealing part and is positioned in the first annular groove ring positioning area; the columnar traction part is provided with a second opening penetrating along the radial direction of the column;

the traction part tears the third sealing part from the first annular groove under the action of external force, and a first opening penetrating through the first through hole is formed in the third sealing part.

Further, the sealing assembly further comprises a hollow member, wherein one end of the hollow member is an open end, and the other end of the hollow member is a closed end;

the hollow member is fixedly connected with the third sealing part through the open end and is communicated with the first through hole (11);

the outer wall close to the closed end of the hollow member is provided with a second annular groove extending along the circumferential direction of the hollow member, and the closed end can be opened along the second annular groove under the action of external force to form a first opening penetrating through the first through hole.

The utility model also provides a single battery with the cover plate, which is characterized in that: the battery pack comprises a shell, wherein the shell is composed of a cylinder body with two open ends, and an upper cover plate and a lower cover plate which are respectively used for sealing the two open ends of the cylinder body, and at least one of the upper cover plate and the lower cover plate is any battery cell cover plate.

The beneficial effects of the utility model are as follows:

1. according to the utility model, the sealing components made of non-metal materials are formed at the first through hole and the second through hole of the cover plate main body by adopting an injection molding process, and in the opening process, even if flying scraps fly out, the flying scraps adhere between the anode and the cathode, so that the battery cannot be short-circuited. Simultaneously, can fix sealing component in first through-hole and second through-hole department through once moulding plastics, realize the sealed of first through-hole and second through-hole, simple process is convenient for process, and the yield is higher.

2. The utility model adopts the polypropylene sealing component which does not react with the electrolyte, and has no influence on the performance of the battery and the electrolyte.

3. According to the utility model, the second through holes are arranged as the step holes, so that the bonding strength of the sealing assembly and the cover plate main body can be improved, when the inner cavity of the single battery is slightly pressurized, the whole sealing assembly cannot fall off from the cover plate main body, or a crack is not formed between the first sealing part and the cover plate main body, and the performance of the single battery is prevented from being damaged.

4. According to the utility model, aiming at cover plates with different thicknesses, a first through hole and a second through hole with different structures are formed on the cover plates, and sealing assemblies with different structural forms are formed; different structures can be selected according to the actual thickness of the cover plate, and the application range is wider.

Drawings

FIG. 1 is a schematic view of the cover plate of embodiment 1;

FIG. 2 is a schematic view of another view structure of the cover plate of embodiment 1;

fig. 3 is a schematic structural view of a cover plate body in embodiment 1;

fig. 4 is a schematic view of another view angle structure of the cover plate body in embodiment 1;

fig. 5 is a sectional view of the cover main body in embodiment 1;

FIG. 6 is a schematic structural view of the seal assembly in embodiment 1;

FIG. 7 is a schematic view showing the structure of a cover plate of embodiment 2;

FIG. 8 is a schematic view of another view structure of the cover plate of embodiment 2;

FIG. 9 is a schematic view showing the structure of a seal assembly in embodiment 2;

FIG. 10 is a schematic view showing the structure of a cover plate in embodiment 3, wherein the cover plate and the cylinder are integrated;

FIG. 11 is a schematic view of another view structure of the cover plate in embodiment 3;

fig. 12 is a schematic diagram of the main structure of the cover plate in embodiment 3;

FIG. 13 is a schematic view showing the structure of a seal assembly in embodiment 3;

FIG. 14 is a schematic view showing the structure of a cover plate in the embodiment 4, wherein the cover plate and the cylinder are integrated;

fig. 15 is a schematic view of another view structure of the cover plate in embodiment 4.

The reference numerals in the drawings are:

1. a cover plate main body; 11. a first through hole; 12. a second through hole; 13. the outer surface of the cover plate main body; 14. the inner surface of the cover plate main body; 15. positioning a plane; 2. a seal assembly; 21. a first sealing part; 22. a second sealing part; 23. a traction section; 24. a second opening; 25. a first annular groove; 26. a hollow member; 27. a second annular groove; 31. a third sealing part; 32. a fourth sealing part; 33. a fifth sealing part; 34. a sixth sealing portion; 5. the pole is avoided the hole.

Detailed Description

So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, but the present utility model may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present utility model is not limited to the specific embodiments disclosed below.

In the description of the present utility model, it should be noted that the azimuth or positional relationship indicated by "top, bottom" or the like in terms are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first, second, third, fourth, etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model provides a cover plate and a single battery with the same, wherein the single battery is a square-shell battery, and the square-shell battery comprises an upper cover plate, a lower cover plate, a cylinder body, a battery cell assembly and electrolyte; the upper cover plate or the lower cover plate and the cylinder body can be integrally formed. The cell assembly may be referred to herein as an electrode assembly, which is assembled by sequentially arranging a positive electrode, a separator, and a negative electrode, using a lamination or winding process. The upper cover plate, the cylinder body and the lower cover plate form a square shell battery shell, and the battery core component and the electrolyte are positioned in the single battery shell.

And at least one cover plate of the single battery is provided with a through hole, and the through hole is sealed by a sealing assembly, so that the influence of the external environment on electrolyte in the inner cavity of the shell is avoided.

The single battery provided by the utility model is mainly used for constructing a large-capacity battery (also called a battery pack or a battery module).

Such high capacity batteries include a plurality of parallel cells and at least one shared conduit assembly.

The shared pipeline assembly can be used as an electrolyte shared pipeline, and the sealing assembly sealed on the lower cover plate of each single battery is opened by utilizing the action of external force, and the electrolytes in the inner cavities of all the single batteries are communicated through the electrolyte shared pipeline, so that the electrolytes of all the single batteries are in the same system, the difference between the electrolytes of all the single batteries is reduced, the consistency between the single batteries is improved to a certain extent, and the cycle life of the high-capacity battery is prolonged to a certain extent.

The shared pipeline assembly can also be used as a gas communication pipeline, and the sealing assembly sealed on the upper cover plate of each single battery is opened by utilizing the action of external force, and the gas in the inner cavity of each single battery is communicated through the gas communication pipeline, so that the gas in the inner cavity of the whole large-capacity battery is balanced, and the cycle life of the large-capacity battery is prolonged to a certain extent.

The utility model is further described below with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1 and 2, a schematic structural diagram of a single battery cover plate according to this embodiment includes a cover plate body 1 and a sealing assembly 2 disposed on the cover plate body 1.

The shape of the cover plate main body 1 is matched with the shape of the open end of the cylinder, the area of the cover plate main body can be slightly larger than that of the open end of the cylinder, and the cover plate main body is fixed at the open end of the cylinder in a fusion welding mode; the step surface is arranged on the periphery of the cover plate main body 1, fixation is achieved through fusion welding, the step surface can be used as a positioning surface, the cover plate can be positioned at the open end of the cylinder by using the positioning surface, and then the cover plate can be fixed through fusion welding. The area of the cover plate main body 1 can be slightly smaller than the area of the open end of the cylinder, and the cover plate main body is fixed at the open end of the cylinder in a caulking manner.

As shown in fig. 3 to 5, the cover main body 1 is provided with a first through hole 11 and at least one second through hole 12, and when the cover is fixed at the open end of the cylinder, both through holes are communicated with the inner cavity of the cylinder. In this embodiment, the first through hole 11 and the second through hole 12 are both stepped holes, and for convenience of description, the first through hole 11 and the second through hole 12 are defined as a first stepped hole and a second stepped hole, respectively; the large hole of the first step hole is formed near the outer surface 13 of the cover plate main body; the second stepped hole is positioned in the peripheral area of the small hole of the first stepped hole, and the large hole of the second stepped hole is arranged close to the inner surface 14 of the cover plate main body.

The position of the first stepped hole on the cover main body 1 is not limited, but the first stepped hole may be opened at the center position of the cover main body 1 for structural symmetry. When the upper cover plate is used, the size of the first step hole needs to ensure that gas in the inner cavity of the cylinder is flushed out, and when the lower cover plate is used, the size of the first step hole needs to ensure that electrolyte in the inner cavity of the cylinder flows out or that external electrolyte can enter the inner cavity of the cylinder. It should be noted that, as shown in fig. 1, when the cover plate is used as the upper cover plate, the pole avoidance hole 5 is further required to be added on the cover plate, so that the pole of the battery cell assembly extends out, and the first step hole is located between the two pole avoidance holes 5. The first step hole and the second step hole can be round holes, square holes or other polygonal holes, and the first step hole and the second step hole can be specifically selected according to actual requirements.

As shown in fig. 1 and 2, the sealing assembly 2 is formed on the cover plate body by injection molding a nonmetallic material, and is used for sealing the first step hole and the second step hole. The sealing component 2 is made of PP (polypropylene), PE (polyethylene), PC (polycarbonate), PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PPO (polyphenylene oxide), or the like. Polypropylene is preferred in this example because of its good PP molding effect.

The seal assembly 2 is divided into a first seal portion 21 and a second seal portion 22 according to different functions for convenience of description, the first seal portion 21 is formed in the first stepped hole to seal the first stepped hole and the second stepped hole, and the second seal portion 22 is formed in the second stepped hole to fix the first seal portion 21 to the cover main body 1, as shown in fig. 6.

As can be seen from fig. 3 and fig. 4, in this embodiment, the second step holes are plural and uniformly distributed in the peripheral area of the small hole of the first through hole. In other embodiments, the number of the second step holes may be 1, which is simpler than the structure of the present embodiment, but the bonding strength between the sealing assembly 2 and the cover main body 1 is weaker, and when the inner cavity of the unit cell is slightly pressurized, the whole sealing assembly 2 may be separated from the cover main body 1, or a crack may be formed between the first sealing portion 21 and the cover main body 1, so that the performance of the unit cell is damaged.

In order to enable the seal assembly 2 to be opened by an external force, it can be seen from fig. 6 that the present embodiment forms a columnar traction portion 23 on the outer surface of the first seal portion 21; the columnar traction part 23 protrudes from the first sealing part 21 and is integrally arranged with the first sealing part 21; the columnar traction portion 23 is provided with a second hole 24 penetrating in the column radial direction.

When the high-capacity battery is built, the columnar traction part 23 of each single battery stretches into the inner cavity of the shared pipeline assembly, the columnar traction part 23 is pulled by external force in the shared pipeline assembly, for example, the traction wire penetrates into the second opening 24 of each single battery, and the first sealing part 21 and the second sealing part 22 are driven to fall off from the first step hole and the second step hole or the first sealing part 21 is torn by pulling the traction wire, so that a first opening penetrating through the large hole of the first step hole is formed in the first sealing part 21.

In order to facilitate forming the first opening, as shown in fig. 1 and 6, in this embodiment, a circle of first annular grooves 25 are provided on the first sealing portion 21, and the traction portion 23 is provided on a circle area of the annular grooves 25; when the traction portion 23 is pulled by an external force, the first sealing portion 21 tears along the first annular groove 25 to form a first opening. Through setting up first annular groove 25 for when traction portion 23 was pulled, easily broken formation first trompil through first annular groove 25, convenient operation reduces the degree of difficulty that forms first trompil. The traction part 23 is eccentrically arranged on the circle fixing area of the first annular groove 25, and is close to the first annular groove 25, compared with the traction part which is arranged at the right center, the traction part 23 is eccentrically arranged, so that the tearing efficiency is improved, and the operation is simple.

In some embodiments, the first annular groove 25 delineated area is shaped as a drop, a circle or a racetrack, the drop being easy to tear, the circle and racetrack being easy to machine. The first annular groove 25 has a V-shaped or U-shaped cross section.

Example 2

This embodiment employs a seal assembly 2 different from embodiment 1.

As shown in fig. 7, the sealing assembly 2 of the present embodiment is still filled in the first step hole and the second step hole, and unlike in embodiment 1, the present embodiment further includes a hollow member 26, one end of the hollow member 26 is an open end, and one end is a closed end; the hollow member 26 is fixedly connected with the first sealing part 21 through the open end and is communicated with the first step hole small hole; when the large-capacity battery is built, the closed ends of the hollow members 26 of the individual battery cells extend into the inner cavity of the shared pipeline assembly, and the closed ends are opened by external force in the shared pipeline assembly to form openings penetrating through the small holes of the first step holes.

In order to facilitate opening the closed end, as shown in fig. 7, the present embodiment is provided with a second annular groove 27 extending along the circumferential direction of the hollow member 26 on the outer wall near the closed end of the hollow member 26, and the closed end can be opened along the second annular groove 27 by the action of external force. Through setting up second annular groove 27 for when external force acted on second annular groove 27, easily break and form the trompil through second annular groove 27, convenient operation reduces the degree of difficulty that forms the trompil. The second annular groove 27 may have a V-shaped or U-shaped cross section.

Example 3

The embodiment is suitable for cover plates with thinner thickness, such as a structure for integrally forming a cylinder body and an upper cover plate or a lower cover plate, and as shown in fig. 10 and 11, the structure adopts stamping forming, the wall thickness of a part is only 0.4 to 0.5MM, and the possibility of machining the part in the wall thickness direction is almost avoided, so that a step hole cannot be machined. Therefore, unlike the above-described embodiments, the first through hole 11 and the second through hole 12 of the cap body 1 of the present embodiment are both straight holes, corresponding to the sealing assembly 2 having different structures.

The cover structure of the present embodiment is shown in fig. 10 and 11, and includes a cover main body 1 and a seal assembly 2 provided on the cover main body 1.

As shown in fig. 12, at least two through holes are formed in the cover plate main body 1, and the two through holes are communicated with the inner cavity of the cylinder. For convenience of description, two through holes may be defined as a first through hole 11 and a second through hole 12, respectively, and the first through hole 11 and the second through hole 12 are both straight holes.

The position of the first through hole 11 on the cover main body 1 is not limited, but the first through hole 11 may be opened at the center of the cover main body 1 for structural symmetry. When the upper cover plate is used, the size of the first through hole 11 needs to ensure that the gas in the inner cavity of the cylinder is flushed out, and when the lower cover plate is used, the size of the first through hole 11 needs to ensure that the electrolyte in the inner cavity of the cylinder flows out or that the external electrolyte can enter the inner cavity of the cylinder. It should be noted that, when the cover plate is used as the upper cover plate, the pole avoidance hole 5 is further required to be additionally arranged on the cover plate, so that the pole of the battery cell assembly extends out, and the first through hole 11 is located between the two pole avoidance holes 5. The first through hole 11 and the second through hole 12 can be round holes, square holes or other polygonal holes, and can be specifically selected according to actual requirements.

As shown in fig. 10 and 11, the sealing member 2 is partially filled in the first through hole 11 and the second through hole 12 for sealing the first through hole 11 and the second through hole 12.

The seal assembly 2 is isolated from the first through hole 11 and the second through hole 12, and its structure is shown in fig. 13, and is divided into a third seal portion 31, a fourth seal portion 32, a fifth seal portion 33 and a sixth seal portion 34 according to different functions for convenience of description; the third sealing portion 31 is formed in the first through hole 11; the fourth sealing part 32 covers the area of the outer surface 13 of the cover plate main body around the first through hole 11; the fifth sealing portion 33 is formed in the second through hole 12; the sixth seal 34 covers the area of the cover body inner surface 14 around the perimeter of the second through hole 12.

As can be seen from fig. 12, in this embodiment, the second through holes 12 are plural and uniformly distributed on the cover plate area around the first through hole 11. In other embodiments, the number of the second through holes 12 may be 1, which is simpler than the structure of the present embodiment, but the bonding strength between the sealing assembly 2 and the cover main body 1 is weaker, and when the inner cavity of the unit cell is slightly pressurized, the whole sealing assembly 2 may be separated from the cover main body 1, or a crack may be formed between the third sealing portion 31 and the cover main body 1, so that the performance of the unit cell is damaged.

In order to facilitate opening of the sealing assembly 2 by external force, it can be seen from fig. 13 that the present embodiment forms the columnar traction portion 23 on the outer surface of the third sealing portion 31; the columnar traction part 23 protrudes from the third sealing part 31 and is integrally arranged with the third sealing part 31; the columnar traction portion 23 is provided with a second hole 24 penetrating in the column radial direction.

When the high-capacity battery is built, the columnar traction part 23 of each single battery stretches into the inner cavity of the shared pipeline assembly, and the columnar traction part 23 is pulled by external force in the shared pipeline assembly to drive the sealing assembly 2 to fall off from the cover plate main body 1 or tear the third sealing part 31, so that a first opening penetrating through the first through hole 11 is formed in the third sealing part 31.

In order to facilitate forming the first opening, as shown in fig. 10, in this embodiment, a circle of first annular grooves 25 is provided on the third sealing portion 31, and the traction portion 23 is provided on a circle area of the first annular grooves 25; when the traction portion 23 is pulled by an external force, the third sealing portion 31 tears along the first annular groove 25 to form the first through hole 11. Through setting up first annular groove 25 for when traction portion 23 was pulled, easily broken formation first through-hole 11 through first annular groove 25, convenient operation reduces the degree of difficulty of forming first through-hole 11. The traction part 23 is eccentrically arranged on the circle fixing area of the first annular groove 25, and is close to the first annular groove 25, compared with the traction part which is arranged at the right center, the traction part 23 is eccentrically arranged, so that the tearing efficiency is improved, and the operation is simple.

Example 4

This embodiment employs a seal assembly 2 different from embodiment 3.

As shown in fig. 14 and 15, the sealing assembly 2 of the present embodiment is still partially filled in the first through hole 11 and the second through hole 12, and partially covers the inner and outer surfaces of the cover main body 1, unlike embodiment 3, the present embodiment further includes a hollow member 26, one end of the hollow member 26 is an open end, and the other end is a closed end; the hollow member 26 is fixedly connected with the third sealing portion 31 through the open end and is communicated with the first through hole; when the large-capacity battery is built, the closed end of the hollow member 26 of each single battery extends into the inner cavity of the shared pipeline assembly, and the closed end is opened by external force in the shared pipeline assembly to form an opening penetrating the first through hole 11.

In order to facilitate opening the closed end, as shown in fig. 14, the present embodiment is provided with a second annular groove 27 extending along the circumferential direction of the hollow member 26 on the outer wall near the closed end of the hollow member 26, and the closed end can be opened along the second annular groove 27 by the action of external force. Through setting up second annular groove 27 for when external force acted on second annular groove 27, easily break and form the trompil through second annular groove 27, convenient operation reduces the degree of difficulty that forms the trompil.

Claims (10)

1. Cover plate, comprising a cover plate body (1), characterized in that: the sealing assembly (2) is arranged on the cover plate main body (1);

the cover plate main body (1) is provided with a first through hole (11) and at least one second through hole (12);

the sealing component (2) is a nonmetal injection molding piece and is at least partially molded in the first through hole (11) and the second through hole (12) to seal the first through hole (11) and the second through hole (12);

under the action of external force, the sealing component (2) can fall off from the cover plate main body (1) or a first opening penetrating through the first through hole (11) is formed in the sealing component (2).

2. The cover plate according to claim 1, wherein: the sealing component (2) is made of polypropylene.

3. The cover plate according to claim 1 or 2, wherein: the first through hole (11) and the second through hole (12) are step holes;

the large hole of the first through hole (11) is formed close to the outer surface (13) of the cover plate main body;

the second through hole (12) is positioned in the peripheral area of the small hole of the first through hole, and the large hole of the second through hole is formed close to the inner surface of the cover plate main body;

the sealing assembly (2) comprises a first sealing part (21) and a second sealing part (22) which are connected with each other, at least one part of the first sealing part (21) is formed in the first through hole (11), the first through hole (11) and the second through hole (12) are sealed, and the second sealing part (22) is formed in the second through hole (12) and is used for fixing the first sealing part (21) on the cover plate main body (1);

under the action of external force, the sealing component (2) can fall off from the cover plate main body (1) or a first opening penetrating through the small hole of the first through hole (11) is formed in the sealing component (2).

4. A cover plate according to claim 3, wherein: the number of the second through holes (12) is multiple, and the second through holes are uniformly distributed in the peripheral area of the small hole of the first through hole.

5. The cover plate of claim 4, wherein: the sealing assembly (2) further comprises a columnar traction part (23); the first sealing part (21) is provided with a first annular groove (25);

the columnar traction part (23) protrudes out of the first sealing part (21) and is integrally arranged with the first sealing part (21) and is positioned in the circle fixing area of the first annular groove (25); the columnar traction part (23) is provided with a second opening (24) which is communicated along the radial direction of the column;

the traction part (23) tears the first sealing part (21) from the first annular groove (25) under the action of external force, and a first opening penetrating through the small hole of the first through hole (11) is formed in the first sealing part (21).

6. The cover plate of claim 4, wherein: the sealing assembly (2) further comprises a hollow member (26), one end of the hollow member (26) is an open end, and the other end is a closed end;

the hollow member (26) is fixedly connected with the first sealing part (21) through the open end and is communicated with the small hole of the first through hole (11);

a second annular groove (27) extending along the circumferential direction of the hollow member (26) is formed on the outer wall close to the closed end of the hollow member (26), and the closed end can be opened along the second annular groove (27) under the action of external force to form a first opening penetrating through the small hole of the first through hole (11).

7. The cover plate according to claim 1 or 2, wherein: the first through hole (11) and the second through hole (12) are straight holes;

the seal assembly (2) comprises a third seal part (31), a fourth seal part (32), a fifth seal part (33) and a sixth seal part (34) which are connected with each other;

the third sealing part (31) is formed in the first through hole (11);

the fourth sealing part (32) covers the area of the outer surface (13) of the cover plate main body around the first through hole (11);

the fifth sealing part (33) is formed in the second through hole (12);

the sixth sealing portion (34) covers the area of the inner surface (14) of the cover main body around the second through hole (12).

8. The cover plate of claim 7, wherein: the sealing assembly (2) further comprises a columnar traction part (23); the third sealing part (31) is provided with a first annular groove (25);

the columnar traction part (23) protrudes out of the third sealing part (31) and is integrally arranged with the third sealing part (31) and is positioned in the circle fixing area of the first annular groove (25); the columnar traction part (23) is provided with a second opening (24) which is communicated along the radial direction of the column;

the traction part (23) tears the third sealing part (31) from the first annular groove (25) under the action of external force, and a first opening penetrating the first through hole (11) is formed in the third sealing part (31).

9. The cover plate of claim 7, wherein: the sealing assembly (2) further comprises a hollow member (26), one end of the hollow member (26) is an open end, and the other end is a closed end;

the hollow member (26) is fixedly connected with the third sealing part (31) through the open end and is communicated with the first through hole (11);

a second annular groove (27) extending along the circumferential direction of the hollow member (26) is formed in the outer wall close to the closed end of the hollow member (26), and the closed end can be opened along the second annular groove (27) under the action of external force to form a first opening penetrating through the first through hole (11).

10. A single cell, characterized in that: comprising a shell, wherein the shell is composed of a cylinder body with two open ends and an upper cover plate and a lower cover plate which are respectively used for sealing the two open ends of the cylinder body, and at least one of the upper cover plate and the lower cover plate is the cover plate of any one of claims 1 to 9.