CN219371169U

CN219371169U - Battery cover plate assembly and power battery

Info

Publication number: CN219371169U
Application number: CN202223089469.6U
Authority: CN
Inventors: 肖湘; 窦俊青; 李文俊; 陈坤; 盛军; 赵云; 俞会根
Original assignee: Weilan Haibo Zibo New Energy Technology Co ltd
Current assignee: Weilan Haibo Zibo New Energy Technology Co ltd
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-07-18
Anticipated expiration: 2032-11-16

Abstract

The utility model relates to the technical field of lithium batteries, and discloses a battery cover plate assembly and a power battery. The battery cover plate assembly comprises a battery cover plate (10) and sealing nails (20), wherein liquid supplementing holes (11) and sealing nail mounting holes (12) surrounding the outer sides of the liquid supplementing holes (11) are formed in the battery cover plate (10), the sealing nails (20) are detachably mounted in the sealing nail mounting holes (12), and gaskets (30) used for sealing the liquid supplementing holes (11) are arranged between the sealing nails (20) and the liquid supplementing holes (11). In the utility model, when the liquid injection or the liquid supplement is needed, the sealing nail and the gasket can be directly disassembled, the electrolyte is injected into the liquid supplement hole, and the gasket and the sealing nail are arranged after the liquid injection or the liquid supplement is finished. The battery cover plate assembly has good sealing effect, the service life of the battery is prolonged, the safety and the reliability of the battery are guaranteed, and the battery can be filled with liquid and the liquid can be supplemented for many times through the battery cover plate assembly.

Description

Battery cover plate assembly and power battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery cover plate assembly. On the basis, the utility model also relates to a power battery.

Background

With the development of the current society and the progress of technology, in the existing secondary battery system, the lithium ion battery has the remarkable advantages of high energy density, long cycle life, no pollution and the like, and is widely used as a power source of portable electronic products such as mobile communication, portable computers, digital cameras and the like and a power energy storage system of an electric automobile. The service life and the safety of the battery are important concerns of people on the lithium ion battery, and the fluid replacement has important significance in the aspect of improving the service life of the battery. The liquid injection and sealing of the lithium battery are important processes in the post-manufacturing process of the battery, the existing liquid injection and sealing modes of the lithium battery basically adopt direct perforation on a cover plate substrate for liquid injection, and the subsequent sealing adopts steel ball reinforcement glue sealing or adopts a metal sealing sheet for carrying out laser welding sealing on a liquid injection port. However, the liquid supplementing pore structure in the prior art has the following disadvantages:

1. some liquid filling structures used for the top cover of the square battery can only be used for one-time liquid filling, and once the liquid filling is completed, the liquid filling structure cannot be opened again;

2. some liquid filling hole structures which can be used for liquid filling are unreliable in sealing after liquid filling, the situation of liquid leakage possibly occurs, and safety problems are easy to cause.

Therefore, there is a need for a liquid injection hole structure to solve at least some of the above problems.

Disclosure of Invention

The utility model aims to solve the problem that the liquid can not be replenished again after the liquid is replenished by welding and sealing in the prior art, and provides a battery cover plate assembly which has the advantage of being capable of replenishing liquid for many times.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a battery cover assembly including a battery cover and a sealing nail, wherein a fluid-replenishing hole and a sealing nail mounting hole surrounding the fluid-replenishing hole are formed in the battery cover, the sealing nail is detachably mounted in the sealing nail mounting hole, and a gasket for sealing the fluid-replenishing hole is disposed between the sealing nail and the fluid-replenishing hole.

Optionally, an inner sidewall of the sealing nail mounting hole is formed with an inner thread, and an outer surface of the sealing nail is formed with an outer thread matched with the inner thread.

Optionally, a cylinder extending upwards from the bottom surface of the sealing nail mounting hole is arranged in the sealing nail mounting hole, and the fluid supplementing hole penetrates through the top surface of the cylinder and the bottom surface of the battery cover plate.

Optionally, a containing cavity for containing the cylinder and the gasket is formed in the sealing nail, and the gasket is located in the containing cavity and seals the fluid infusion hole on the top surface of the cylinder.

Optionally, a distance between a top surface of the receiving cavity and a top surface of the post is less than a thickness of the spacer.

Optionally, the outer diameter of the spacer is not smaller than the outer diameter of the cylinder.

Optionally, the battery cover assembly includes a pin, the pin being partially mounted on the battery cover and another portion being mounted on the sealing pin to be able to define a circumferential relative position of the sealing pin and the battery cover.

Optionally, a first pin mounting hole communicated with the sealing pin mounting hole is formed on the battery cover plate, a second pin mounting hole corresponding to the first pin mounting hole is formed on the sealing pin, a pin part is mounted in the first pin mounting hole, and another part is mounted in the second pin mounting hole.

Optionally, the battery cover plate assembly comprises two pins, and the two pins are symmetrically connected to the joint of the battery cover plate and the sealing nail.

Optionally, the sealing nail is formed with a first slot for cooperating with a tool to mount or dismount the sealing nail.

Optionally, the pin has a second slot formed therein for mating with a tool to mount the pin.

A second aspect of the present utility model provides a power battery comprising a battery cover assembly according to the above, the fluid-filled hole communicating with the interior of the power battery.

According to the technical scheme, the battery is detachably arranged in the sealing nail mounting hole through the sealing nail, and the gasket for sealing the fluid supplementing hole is arranged between the sealing nail and the fluid supplementing hole, so that the battery can directly detach the sealing nail and the gasket when the battery needs to be filled with fluid or supplementing fluid, then electrolyte is injected into the fluid supplementing hole, and the gasket and the sealing nail are arranged after the fluid injection or the fluid supplementing is completed. The battery cover plate component has good sealing effect, prolongs the service life of the battery, ensures the safe and reliable performance of the battery, and can be used for filling and supplementing liquid for a plurality of times. In addition, the sealing nail in the battery cover plate assembly does not need to be welded when in sealing, so that the production efficiency is improved.

Drawings

FIG. 1 is a cross-sectional view of a battery cover assembly of the present utility model;

FIG. 2 is another angular schematic view of the cross-sectional view of FIG. 1;

fig. 3 is an exploded view of yet another angular schematic of the cross-sectional view of fig. 1.

Description of the reference numerals

10-battery cover plate; 11-fluid supplementing holes; 12-sealing the nail mounting hole; 13-column; 14-a first pin mounting hole; 20-sealing nails; 21-a second pin mounting hole; 30-a gasket; 40-pins.

Detailed Description

The following describes specific embodiments of the present utility model in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model. In the present utility model, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to refer generally to the orientation shown in the drawings, and "inner" and "outer" refer to the interior and exterior of the outline of the components themselves.

The utility model provides a battery cover plate assembly, which comprises a battery cover plate 10 and sealing nails 20, wherein liquid supplementing holes 11 and sealing nail mounting holes 12 surrounding the outer sides of the liquid supplementing holes 11 are formed on the battery cover plate 10, the sealing nails 20 are detachably mounted in the sealing nail mounting holes 12, and gaskets 30 for sealing the liquid supplementing holes 11 are arranged between the sealing nails 20 and the liquid supplementing holes 11.

According to the utility model, the sealing nail 20 is detachably arranged in the sealing nail mounting hole 12, and the gasket 30 for sealing the fluid infusion hole 11 is arranged between the sealing nail 20 and the fluid infusion hole 11, so that the sealing nail 20 and the gasket 30 can be directly disassembled when the battery needs to be infused or infused, electrolyte is infused into the fluid infusion hole 11, and the gasket 30 and the sealing nail 20 are assembled after the infusion or infusion is completed. The battery cover plate component has good sealing effect, prolongs the service life of the battery, ensures the safe and reliable performance of the battery, and can be used for filling and supplementing liquid for a plurality of times. In addition, the sealing nail in the battery cover plate assembly does not need to be welded when in sealing, so that the production efficiency is improved.

In one embodiment, to facilitate the installation of the sealing nail 20, the inner sidewall of the sealing nail installation hole 12 is formed with an internal thread, and the outer surface of the sealing nail 20 is formed with an external thread engaged with the internal thread. In a preferred embodiment, the seal pin 20 and the seal pin mounting hole 12 may be interfitting seal threads therebetween. The sealing nail 20 and the sealing nail mounting hole 12 are mutually matched through threads, so that metal scraps can be effectively prevented from entering the battery, and the safety of the battery is improved.

Further, the sealing nail mounting hole 12 is configured to be recessed downwards from the top surface of the battery cover plate 10, a column 13 extending upwards from the bottom surface of the sealing nail mounting hole 12 is arranged in the sealing nail mounting hole 12, and the fluid infusion hole 11 penetrates through the top surface of the column 13 and the bottom surface of the battery cover plate 10. Further, a receiving cavity for receiving the cylinder 13 and the gasket 30 is formed in the sealing nail 20, and the gasket 30 is positioned in the receiving cavity and closes the fluid-supplementing hole 11 on the top surface of the cylinder 13. In this embodiment, when the seal nail 20 is preloaded to a predetermined position, the gasket 30 can be pressed and fixed, thereby improving the sealing effect.

It will be appreciated that in other embodiments, the post 13 may be omitted, the fluid-filling hole 11 is disposed to penetrate from the bottom surface of the seal nail mounting hole 12 to the bottom surface of the battery cover plate 10, and the gasket 30 includes a limiting portion and a blocking portion extending downward from the limiting portion, where the size of the limiting portion is greater than the size of the fluid-filling hole 11, so as to prevent the gasket 30 from being fully plugged into the fluid-filling hole 11 and inconvenient to be taken out, and the size of the blocking portion is slightly greater than the size of the fluid-filling hole 11, so as to seal the fluid-filling hole 11.

Furthermore, in order to ensure a sealing effect, in one embodiment, the distance between the top surface of the receiving chamber and the top surface of the cylinder 13 may be smaller than the thickness of the gasket 30. In another preferred embodiment, the outer diameter of the spacer 30 is not smaller than the outer diameter of the cylinder 13.

To prevent rotation of the sealing nail 20, the battery cover assembly may include a pin 40, a portion of the pin 40 being mounted to the battery cover 10, and another portion being mounted to the sealing nail 20 so as to be able to define a circumferential relative position of the sealing nail 20 and the battery cover 10. Further, referring to fig. 1 to 3, the battery cover 10 is formed with a first pin mounting hole 14 communicating with the seal pin mounting hole 12, the seal pin 20 is formed with a second pin mounting hole 21 corresponding to the first pin mounting hole 14, and the pin 40 is partially mounted in the first pin mounting hole 14 and the other is mounted in the second pin mounting hole 21.

It will be appreciated that in the above embodiments, a single pin 40 may prevent rotation of the seal pin 20. To further prevent rotation of the sealing nail 20, the battery cover assembly may include two pins 40, the two pins 40 being symmetrically connected to the junction of the battery cover 10 and the sealing nail 20. In this embodiment, two second pin mounting holes 21 are formed on the sealing pin 20, and the sealing pin 20 can be mounted and dismounted by a tool mounted in the second pin mounting holes 21.

Further, in other embodiments, the sealing spike 20 has a first slot formed therein for mating with a tool to install or remove the sealing spike 20. In another embodiment, the pin 40 has a second slot formed therein for mating with a tool to mount the pin 40.

In yet another embodiment, the sealing spike 20 and pin 40 may not have slots for mating with a tool in order to ensure the strength of the sealing spike 20 and pin 40. The pin 40 is preferably made of iron and is attracted to a tool having a magnet to remove or install the pin 40, and after removal of the pin 40, the seal pin 20 can be installed and removed by a tool installed in the second pin installation hole 21. The pin 40 in this embodiment may be rectangular or long cylindrical in shape.

The utility model also provides a power battery which comprises the battery cover plate assembly, wherein the fluid supplementing hole 11 is communicated with the interior of the power battery. The advantages of the power battery and the battery cover plate assembly compared with the prior art are the same, and are not described in detail herein.

The preferred embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited thereto. Within the scope of the technical idea of the utility model, a plurality of simple variants of the technical proposal of the utility model can be carried out, comprising that each specific technical feature is combined in any suitable way, and in order to avoid unnecessary repetition, the utility model does not need to be additionally described for various possible combinations. Such simple variations and combinations are likewise to be regarded as being within the scope of the present disclosure.

Claims

1. The battery cover plate assembly is characterized by comprising a battery cover plate (10) and sealing nails (20), wherein liquid supplementing holes (11) and sealing nail mounting holes (12) surrounding the liquid supplementing holes (11) are formed in the battery cover plate (10), the sealing nails (20) are detachably mounted in the sealing nail mounting holes (12), and gaskets (30) used for sealing the liquid supplementing holes (11) are arranged between the sealing nails (20) and the liquid supplementing holes (11).

2. The battery cover assembly of claim 1, wherein the inside wall of the sealing nail mounting hole (12) is formed with an internal thread, and the outer surface of the sealing nail (20) is formed with an external thread engaged with the internal thread.

3. The battery cover plate assembly according to claim 1, wherein a column body (13) extending upwards from the bottom surface of the sealing nail mounting hole (12) is arranged in the sealing nail mounting hole (12), and the fluid supplementing hole (11) penetrates through the top surface of the column body (13) and the bottom surface of the battery cover plate (10).

4. A battery cover assembly according to claim 3, wherein the sealing nail (20) has a receiving cavity formed therein for receiving the cylinder (13) and the gasket (30), the gasket (30) being located in the receiving cavity and closing the fluid-filled hole (11) at the top surface of the cylinder (13).

5. The battery cover plate assembly according to claim 4, wherein a distance between a top surface of the receiving cavity and a top surface of the cylinder (13) is smaller than a thickness of the gasket (30), and/or an outer diameter of the gasket (30) is not smaller than an outer diameter of the cylinder (13).

6. The battery cover assembly of claim 1, comprising a pin (40), the pin (40) being partially mounted to the battery cover (10) and another portion being mounted to the sealing pin (20) to enable defining a circumferential relative position of the sealing pin (20) and the battery cover (10).

7. The battery cover plate assembly according to claim 6, wherein a first pin mounting hole (14) communicating with the seal pin mounting hole (12) is formed in the battery cover plate (10), a second pin mounting hole (21) corresponding to the first pin mounting hole (14) is formed in the seal pin (20), and the pin (40) is partially mounted in the first pin mounting hole (14) and the other part is mounted in the second pin mounting hole (21).

8. The battery cover assembly according to claim 6, characterized in that it comprises two of said pins (40), the two pins (40) being symmetrically connected at the junction of the battery cover (10) and the sealing pin (20).

9. The battery cover assembly according to any one of claims 6-8, wherein the sealing pin (20) is formed with a first slot for cooperating with a tool to mount or dismount the sealing pin (20) and/or the pin (40) is formed with a second slot for cooperating with a tool to mount the pin (40).

10. A power battery, characterized in that it comprises a battery cover assembly according to any one of claims 1-9, said fluid-filled aperture (11) being in communication with the interior of said power battery.