CN221080189U

CN221080189U - Pole assembly, cover plate assembly and power battery

Info

Publication number: CN221080189U
Application number: CN202322965538.3U
Authority: CN
Inventors: 胡炎煌; 陈蓉周; 唐六生; 赵文杰
Original assignee: Hubei Taipu Electronic Co ltd
Current assignee: Hubei Taipu Electronic Co ltd
Priority date: 2023-10-31
Filing date: 2023-10-31
Publication date: 2024-06-04
Anticipated expiration: 2033-10-31

Abstract

In order to overcome the problems of poor tightness and low assembly efficiency caused by sinking of a pole with low pole connection strength in assembly of a cover plate assembly in the prior art, the pole assembly comprises a metal ring, a pole, a sealing piece and an upper plastic piece, wherein the pole is in an assembly state and a locking state; when the pole is in a locking state, the extending section rotates to drive the first lugs and the clamping grooves to be staggered, the first lugs and the second lugs are overlapped with each other, and the relative positions of the pole and the metal ring are fixed by the upper plastic part. The utility model also discloses a cover plate assembly and a power battery, wherein the cover plate assembly comprises the pole assembly; compared with the traditional assembly procedure of the cover plate assembly, the design of the pole and the metal ring can improve the assembly efficiency.

Description

Pole assembly, cover plate assembly and power battery

Technical Field

The utility model belongs to the technical field of battery core cover plates, and particularly relates to a pole assembly, a cover plate assembly and a power battery cell.

Background

The battery cell is an important component of the battery pack as the electric energy storage unit, the battery cell comprises a shell and a cover plate component, the battery cell cover plate component belongs to the important component of the battery cell, and the structure directly affects the safety of the battery cell, the capacity of the battery cell, the cost of the battery cell and the like; most of the current industries use square cell structures, and a sealing space is formed by utilizing the shell and the cover plate and is used for accommodating an electrode assembly and electrolyte; in the existing cover plate, a pole column with a clamping groove on the side edge directly penetrates through a top cover plate with a pole column hole, then the pole column is fixed in a mode of injection molding an insulator, and because the temperature of a battery cell is higher during operation, the insulator itself has a slight softening phenomenon under the long time, the pole column is sunk under the action of the tension of a sealing ring, the tightness of the battery cell is affected, and the assembly efficiency of the top cover is limited to a great extent.

Disclosure of utility model

The utility model aims to solve the technical problems of poor tightness and low assembly efficiency caused by sinking of a pole with low pole connection strength in assembly of a cover plate assembly in the prior art, and provides a pole assembly, a cover plate assembly and a power battery.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

The utility model provides a apron subassembly, including metal ring, utmost point post, sealing member and last plastic part, the utmost point post includes interconnect's bottom plate and extension, extension periphery interval is equipped with a plurality of first lugs; the bottom plate is positioned at one side of the metal ring, the sealing piece is sleeved on the periphery of the extension section, the sealing piece is respectively abutted against the bottom plate and the metal ring, the extension section penetrates through the metal ring, a plurality of clamping grooves are formed in the inner wall of the metal ring at intervals, and a second protruding block is formed between two adjacent clamping grooves;

The pole is provided with an assembling state and a locking state, when the pole is in the assembling state, the positions of the first protruding blocks are in one-to-one correspondence with the positions of the clamping grooves, and the first protruding blocks can penetrate through the clamping grooves and are positioned on the other side of the metal ring; when the pole is in a locking state, the extending section rotates to drive the first protruding blocks and the clamping grooves to be staggered, the first protruding blocks and the second protruding blocks are overlapped, and the upper plastic part fixes the relative positions of the pole and the metal ring.

Optionally, the outer diameter of the extension section is smaller than the outer diameter of the bottom plate.

Optionally, the metal ring includes first ring and second ring, first ring with the coaxial setting of second ring, a plurality of the draw-in groove sets up on the second ring inner wall, first ring with the second ring is integrated into one piece's metalwork.

Optionally, the upper plastic part comprises a circular ring body and an annular flange, the circular ring body surrounds the pole and is sleeved on the periphery of part of the extension section, and the annular flange is arranged on the outer annular surface of the circular ring body.

In one aspect, the utility model provides a cover plate assembly, which comprises a cover plate and the pole assembly, wherein a first pole mounting hole is formed in the cover plate, the metal ring is fixed in the first pole mounting hole, and the bottom surface of the annular flange is abutted to the top surface of the cover plate.

Optionally, the cover plate assembly further comprises a liquid injection hole and an explosion-proof valve, and the liquid injection hole and the explosion-proof valve are both arranged on the cover plate.

Optionally, the outer circumference position of the first pole mounting hole of the cover plate is welded with the metal ring.

Optionally, the cover plate assembly further comprises a lower plastic part, the lower plastic part is arranged on one surface of the cover plate, which faces away from the upper plastic part, and a second pole mounting hole is formed in the position, corresponding to the first pole mounting hole, on the lower plastic part.

Optionally, a buckle is arranged on the second pole mounting hole, and the buckle is in locking connection with the extension section close to the bottom plate.

In another aspect, the present utility model provides a power cell comprising the cover assembly.

According to the pole assembly provided by the utility model, the clamping grooves are formed in the inner wall of the metal ring, the second protruding blocks are formed between the adjacent clamping grooves, the first protruding blocks are arranged on the periphery of the extending section of the pole, the positions of the first protruding blocks correspond to the positions of the clamping grooves one by one, and when the pole is in a locking state, the clamping grooves are used for being in one-to-one clamping fit with the first protruding blocks, so that the connection between the metal ring and the pole is fastened, and the integral sealing performance of the cover plate assembly is improved; in addition, the metal ring, the sealing piece and the pole post can be directly prepared into an integral pole post structural part on the basis of clamping and matching of the clamping groove and the first convex block, and then the upper plastic piece is injection molded on the integral pole post structural part.

Drawings

FIG. 1 is an exploded view of a closure assembly provided by the present utility model;

FIG. 2 is a schematic view of the overall assembly of the cover plate assembly provided by the present utility model;

FIG. 3 is a cross-sectional view of a cover plate assembly provided by the present utility model;

FIG. 4 is a schematic view of a lower plastic part according to the present utility model;

FIG. 5 is a schematic view of a metal ring structure provided by the present utility model;

FIG. 6 is a schematic view of a pole structure provided by the present utility model;

Reference numerals in the drawings of the specification are as follows:

1. A metal ring; 11. a first ring; 12. a second ring; 121. a clamping groove; 122. a second bump; 2. a pole; 21. a bottom plate; 22. a first bump; 23. an extension section; 3. a seal; 4. a plastic part is arranged; 41. a circular ring body; 42. an annular flange; 5. a cover plate; 51. a first pole mounting hole; 6. a liquid injection hole; 7. an explosion-proof valve; 8. a lower plastic part; 81. a second post mounting hole; 9. a buckle; 100. and a cover plate assembly.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate describing 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. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1 to 6, an embodiment of the present utility model provides a pole assembly, which includes a metal ring 1, a pole 2, a sealing member 3 and an upper plastic member 4, wherein the pole 2 includes a bottom plate 21 and an extension section 23 that are connected to each other, and a plurality of first bumps 22 are arranged at intervals on the periphery of the extension section 23; the bottom plate 21 is located at one side of the metal ring 1, the sealing element 3 is sleeved on the periphery of the extension section 23, the sealing element is respectively abutted against the bottom plate 21 and the metal ring 1, the extension section 23 passes through the metal ring 1, a plurality of clamping grooves 121 are formed in the inner wall of the metal ring 1 at intervals, and a second protruding block 122 is formed between two adjacent clamping grooves 121;

The pole 2 has an assembling state and a locking state, when the pole 2 is in the assembling state, the positions of the first protruding blocks 22 are in one-to-one correspondence with the positions of the clamping grooves 121, and the first protruding blocks 22 can pass through the clamping grooves 121 and are positioned on the other side of the metal ring 1; when the pole 2 is in a locked state, the extending section 23 rotates to drive the first protrusions 22 and the clamping grooves 121 to be staggered, the first protrusions 22 and the second protrusions 122 overlap each other, and the upper plastic member 4 fixes the relative positions of the pole 2 and the metal ring 1.

Specifically, in the pole assembly provided by the utility model, the clamping grooves 121 are formed in the inner wall of the metal ring 1, the second protruding blocks 122 are formed between the adjacent clamping grooves 121, the first protruding blocks 22 are arranged on the periphery of the extending section 23 of the pole 2, the positions of the plurality of first protruding blocks 22 are in one-to-one correspondence with the positions of the plurality of clamping grooves 121, and when the pole 2 is in a locking state, the plurality of clamping grooves 121 are in one-to-one clamping fit with the plurality of first protruding blocks 22, so that the connection between the metal ring 1 and the pole 2 is fastened, and the integral sealing performance of the cover plate assembly 100 is improved; in addition, the metal ring 1, the sealing member 3 and the pole 2 may be directly manufactured into an integral pole structural member on the basis of the clamping fit between the clamping groove 121 and the first bump 22, and then the upper plastic member 4 is injection molded onto the integral pole structural member, so that compared with the conventional assembly process of the cover plate assembly 100, the design of the pole 2 and the metal ring 1 in the utility model can improve the assembly efficiency.

In one embodiment, the extension 23 has an outer diameter that is smaller than the outer diameter of the base 21.

Specifically, the outer diameter of the extension section 23 is smaller than the outer diameter of the bottom plate 21, so as to reduce the cross-sectional area of the pole 2, and at this time, the material consumption of the pole 2 is correspondingly reduced, which is beneficial to controlling the production cost of the product; in addition, when the outer diameter of the extension section 23 is smaller than the outer diameter of the bottom plate 21, the sealing member 3 is conveniently sleeved on the outer periphery of the extension section 23.

In an embodiment, the metal ring 1 includes a first ring 11 and a second ring 12, where the first ring 11 and the second ring 12 are coaxially disposed, and the plurality of clamping grooves 121 are disposed on an inner wall of the second ring 12, and the first ring 11 and the second ring 12 are integrally formed metal pieces.

The first circular ring 11 and the second circular ring 12 are coaxially arranged, so that the pole 2 is convenient to install; the first circular ring 11 and the second circular ring 12 are integrally formed, so that gaps are avoided from being generated in connection and assembly of all parts, and in addition, the integral forming is beneficial to improving the sealing performance and the connection strength of the first circular ring and simplifying the assembly process.

In an embodiment, the upper plastic member 4 includes a ring body 41 and an annular flange 42, the ring body 41 surrounds the pole 2 and is sleeved on a part of the outer periphery of the extension section 23, and the annular flange 42 is disposed on an outer ring surface of the ring body 41.

Specifically, the upper plastic part 4 is directly formed on the top of the cover plate in an injection molding mode after the metal ring 1 is welded to the cover plate, so as to play a role in insulation; the upper plastic part 4 can separate the metal ring 1 and the pole 2 from each other to play a role of insulating and sealing.

In another embodiment, the present utility model provides a cover plate assembly 100, the cover plate assembly 100 includes a cover plate 5 and the pole assembly, a first pole mounting hole 51 is provided on the cover plate 5, the metal ring 1 is fixed in the first pole mounting hole 51, and the bottom surface of the annular flange 42 abuts against the top surface of the cover plate 5.

Specifically, the bottom surface of the annular flange 42 abuts against the top surface of the cover plate 5, and when the cover plate 5 is welded with the metal ring 1, the annular flange 42 can cover the welded seam, so that the corrosion of external water vapor to the inside of the battery can be isolated, and the problem caused by poor welding can be solved.

In an embodiment, the cover plate assembly 100 further includes a liquid filling hole 6 and an explosion-proof valve 7, where the liquid filling hole 6 and the explosion-proof valve 7 are both opened on the cover plate 5.

The explosion-proof valve 7 is located between the 2 first pole mounting holes 51, specifically, when the battery is out of control, a large amount of gas is generated, high pressure is formed in the battery, when the pressure in the battery reaches the rated pressure of the explosion-proof valve 7, the explosion-proof valve 7 breaks, and the pressure is released, at this time, the pressure relief effect is achieved on the battery, and explosion of the battery due to the excessive pressure can be avoided;

The electrolyte injection port is used for injecting electrolyte into the battery, the electrolyte enters the inner cavity of the battery shell through the electrolyte injection port, the electrolyte injection port is sealed after the electrolyte injection or formation is finished, and the sealing mode can be performed by welding the cover plate 5 or arranging the openable cover plate 5.

In one embodiment, the outer circumferential position of the first pole mounting hole 51 of the cover plate 5 is welded to the metal ring 1.

Specifically, to the periphery position of the first post mounting hole 51 of the cover plate 5 with the metal ring 1 is welded and connected, so that the post 2 is prevented from moving relatively between the metal ring 1 and the cover plate 5, the connection strength with the cover plate assembly 100 is enhanced, the stability of electrical connection is ensured, and the overall strength and the tightness of the cover plate assembly 100 are further improved.

In an embodiment, the cover assembly 100 further includes a lower plastic part 8, the lower plastic part 8 is disposed on a surface of the cover 5 facing away from the upper plastic part 4, and a second pole mounting hole 81 is disposed on the lower plastic part 8 corresponding to the position of the first pole mounting hole 51.

The second pole mounting hole 81 provided on the lower plastic member 8 includes a positive pole mounting hole and/or a negative pole mounting hole; the pole 2 is connected with the lower plastic part 8 and the cover plate 5 through the positive electrode mounting hole and/or the negative electrode mounting hole to form a cover plate assembly 100.

In an embodiment, the second pole mounting hole 81 is provided with a buckle 9, and the buckle 9 is in a locking connection with the extension section near the bottom plate 21.

In another embodiment, the present utility model provides a power cell comprising the cover assembly 100.

Specifically, when the pole 2 is in an assembled state, the positions of the first protruding blocks 22 and the positions of the clamping grooves 121 are in one-to-one correspondence, when the pole 2 is in a locked state, the extending section 23 rotates to drive the first protruding blocks 22 and the clamping grooves 121 to be staggered, the first protruding blocks 22 and the second protruding blocks 122 are mutually overlapped, the upper plastic part 4 fixes the relative positions of the pole 2 and the metal ring 1, the assembled pole 2 is integrally placed in a mold, the upper plastic part 4 is injection molded, the injection molded component is filled into the cover plate 5 from bottom to top, then welding and fixing are performed at the bottom attaching position, after welding, the second pole mounting holes 81 on the lower plastic part 8 are aligned with the positions of the first pole mounting holes 51 on the cover plate 5, the buckles 9 on the inner wall of the second pole mounting holes 81 are buckled on the edge of the pole 2 from bottom to top, and electrolyte is injected through the electrolyte injection holes 6;

The cover plate assembly 100 and the power battery have good structural stability and sealing performance, and in addition, compared with the traditional cover plate assembly assembling procedure, the design of the pole post 2 and the metal ring 1 can improve the assembling efficiency in specific assembly, and the operation is convenient.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The pole column assembly is characterized by comprising a metal ring, a pole column, a sealing piece and an upper plastic piece, wherein the pole column comprises a bottom plate and an extension section which are connected with each other, and a plurality of first protruding blocks are arranged at intervals on the periphery of the extension section; the bottom plate is positioned at one side of the metal ring, the sealing piece is sleeved on the periphery of the extension section, the sealing piece is respectively abutted against the bottom plate and the metal ring, the extension section penetrates through the metal ring, a plurality of clamping grooves are formed in the inner wall of the metal ring at intervals, and a second protruding block is formed between two adjacent clamping grooves;

2. A pole assembly as claimed in claim 1, wherein the outer diameter of the extension is smaller than the outer diameter of the base plate.

3. The pole assembly of claim 1, wherein the metal ring comprises a first ring and a second ring, the first ring and the second ring are coaxially disposed, the plurality of clamping grooves are disposed on an inner wall of the second ring, and the first ring and the second ring are integrally formed metal pieces.

4. The pole assembly of claim 1, wherein the upper plastic member comprises a circular ring body surrounding the pole and surrounding a portion of the outer periphery of the extension section, and an annular flange disposed on an outer annular surface of the circular ring body.

5. A cover plate assembly, characterized in that the cover plate assembly comprises a cover plate and the pole assembly according to any one of claims 1-4, a first pole mounting hole is formed in the cover plate, the metal ring is fixed in the first pole mounting hole, and the bottom surface of the annular flange is abutted to the top surface of the cover plate.

6. The closure assembly of claim 5, further comprising a fill port and an explosion-proof valve, wherein the fill port and the explosion-proof valve are disposed on the closure.

7. The cover plate assembly of claim 5, wherein the peripheral location of the first post mounting hole of the cover plate is welded to the metal ring.

8. The cover plate assembly of claim 5, further comprising a lower plastic member disposed on a side of the cover plate facing away from the upper plastic member, wherein a second pole mounting hole is disposed on the lower plastic member at a position corresponding to the first pole mounting hole.

9. The cover plate assembly of claim 8, wherein said second post mounting hole is provided with a catch that engages said extension proximate said base plate.

10. A power cell comprising a cover assembly according to any one of claims 1 to 9.