CN219591528U

CN219591528U - Cover plate assembly and battery

Info

Publication number: CN219591528U
Application number: CN202320902157.8U
Authority: CN
Inventors: 王珂
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-20
Filing date: 2023-04-20
Publication date: 2023-08-25
Anticipated expiration: 2033-04-20

Abstract

The utility model discloses a apron subassembly and battery, apron subassembly include top cap piece, lower plastic part, change piece and sealing member, and the top cap piece is equipped with the utmost point post hole, installs the utmost point post in the utmost point post hole, and the top cap piece has first terminal surface and second terminal surface; the lower plastic part is arranged on the second end surface and is provided with a third end surface far away from the second end surface, and the pole hole penetrates through the third end surface; the switching piece is arranged on the third end face and provided with a supporting part extending towards the pole hole, the extending direction of the supporting part is parallel to the second end face, the supporting part is electrically connected with the pole, and the supporting part and the second end face are separated to form an assembly interval; the sealing member is sleeved on the radial periphery of the pole and arranged in the assembly interval. Through the assembly interval with sealing member setting between top cap piece and changeover piece to top cap piece and changeover piece guarantee the compression volume as support piece, can save the extravagant altitude space when utmost point post is as support piece for the assembly between each part is compacter, has improved the energy density of electric core.

Description

Cover plate assembly and battery

Technical Field

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

Background

At present, the main structure of lithium battery includes the casing, establishes the apron subassembly at the electric core and the casing top in the casing, is provided with positive and negative electrode on the apron subassembly, and casing and apron subassembly are the separation production generally, install the electric core in the casing after the assembly again and install the apron subassembly together with the electrode at the casing top and weld sealed the back, pour into electrolyte through the notes liquid hole that reserves on the apron subassembly, then seal the notes liquid hole again, make the battery wholly form sealed operational environment.

The pole of the lithium battery is generally mounted on the top cover plate in an assembling mode, and upper and lower plastic parts are arranged at positions above and below the top cover plate corresponding to the pole, so that insulation treatment is carried out on the pole. In addition, sealing treatment is also needed between the pole and the top cover sheet, so that leakage of electrolyte in the using process is prevented.

As shown in fig. 1, in the prior art, the sealing of the post on most lithium battery cover plate assemblies is performed by an annular sealing member, and the sealing member is sleeved on the radial outer periphery of the post. In order to ensure the sealing effect of the sealing ring, the upper end and the lower end of the sealing piece are respectively propped against the top cover plate and the pole, and the top cover plate and the pole are used as supporting pieces to ensure the compression amount.

However, when the pole is used as a support member for the seal ring, the pole has a stepped portion for abutting against the seal ring, and the stepped portion has a certain thickness in the height direction, resulting in a waste of space in the height direction of the cap assembly.

Accordingly, there is a need for a cover assembly and battery that overcomes the above-described drawbacks.

Disclosure of Invention

In order to overcome the disadvantages of the prior art, it is an object of the present utility model to provide a cover plate assembly which can save a wasted height space when a pole is used as a support by disposing a sealing member in an assembly space between a cover plate and a transfer plate, and securing a compression amount by using the cover plate and the transfer plate as the support.

The second object of the present utility model is to provide a battery, in which the sealing member of the battery cover assembly is disposed in the assembly space between the top cover plate and the adapter plate, and the top cover plate and the adapter plate are used as supporting members to ensure the compression amount, so that the height space wasted when the pole is used as the supporting member can be saved.

One of the purposes of the utility model is realized by adopting the following technical scheme:

a cover plate assembly, which comprises a cover plate and a cover plate, comprising the steps of (a) a step of,

the top cover plate is provided with a pole hole, a pole is arranged in the pole hole, and the top cover plate is provided with a first end face and a second end face which are oppositely arranged;

the lower plastic part is arranged on the second end face and is provided with a third end face far away from the second end face, and the pole hole penetrates through the third end face;

the switching piece is arranged on the third end face and is provided with a supporting part extending towards the pole hole, the extending direction of the supporting plate is parallel to the second end face, the supporting part is electrically connected with the pole, and the supporting part and the second end face are separated to form an assembly interval;

the sealing piece is sleeved on the radial periphery of the pole and arranged in the assembly interval.

The second purpose of the utility model is realized by adopting the following technical scheme:

a battery comprises a battery shell, an electric core and the cover plate assembly, wherein the battery shell is provided with an electric core cavity and an opening, and the opening is communicated with the electric core cavity; the cover plate component is covered on the opening.

Compared with the prior art, the utility model has the beneficial effects that: the sealing element is arranged in the assembly interval between the top cover plate and the transfer plate, the top cover plate and the transfer plate are used as supporting elements to ensure the compression amount, and the height space wasted when the polar column is used as the supporting element of the sealing element can be saved; the assembly between the components is more compact, thereby improving the energy density of the battery cell.

Drawings

FIG. 1 is a partial cross-sectional view of a prior art cover plate assembly;

FIG. 2 is a cross-sectional view of a cover plate assembly according to the present utility model;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a partial cross-sectional view of another cover plate assembly according to the present utility model;

fig. 5 is an exploded view of the cover plate assembly of the present utility model.

In the figure: 1. a cover plate assembly; 2. a top cover sheet; 21. a post hole; 3. a pole; 31. a step portion; 4. a seal; 5. a transfer sheet; 51. a support part; 6. a plastic part is arranged; 7. a lower plastic part; 8. and riveting the blocks.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and detailed description below:

in the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1, a prior art cover plate assembly 1 includes a top cover plate 2, a pole 3, a switching piece 5 and a sealing member 4, wherein a pole hole 21 is formed on the top cover plate 2, the pole 3 is installed in the pole hole 21, and the pole 3 has a step portion 31 extending toward the pole hole 21; the stepped portion 31 is spaced apart from the top cover sheet 2 in the axial direction of the pole 3 to form an assembly space in which the seal 4 is mounted.

Wherein, sealing member 4 installs in the assembly interval after, upwards pushes up top cover plate 2, pushes down utmost point post 3 to top cover plate 2 and utmost point post 3 are as support piece to guarantee the compression volume, thereby guarantee sealing member 4's sealing performance, and then guarantee the holistic leakproofness of apron subassembly 1.

Since the pole 3 has the stepped portion 31 extending toward the pole hole 21, the stepped portion 31 provides a supporting force for the seal 4 to secure the compression amount of the seal 4. However, when the step 31 is used as a support portion for the pole 3, since the step 31 extends in the direction of the pole hole 21, other components of the cover assembly 1 need to be away from the step 31 during assembly, and an assembly space is provided for the step 31; in order to secure the supporting effect, the step portion 31 needs to have a certain thickness S, which may result in a waste of space having a height S in the height direction of the cover assembly 1.

Therefore, the utility model can save the height space with the height S wasted when the pole 3 is used as the support by arranging the sealing element 4 between the top cover plate 2 and the adapter plate 5 and using the top cover plate 2 and the adapter plate 5 as the support, thereby ensuring that the assembly among the components of the cover plate assembly 1 is more compact and improving the energy density of the battery cells.

Referring to fig. 2-5, the improved cover plate assembly 1 of the present utility model includes a top cover plate 2, a lower plastic member 7, an adapter plate 5 and a sealing member 4, wherein a pole hole 21 is provided on the top cover plate 2, a pole 3 is installed in the pole hole 21, the top cover plate 2 has a first end face and a second end face which are oppositely arranged, and the pole hole 21 penetrates from the first end face to the second end face; the lower plastic part 7 is arranged on the second end face, the lower plastic part 7 is provided with a third end face far away from the second end face, and the pole hole 21 penetrates through to the third end face; the switching piece 5 is arranged on the third end surface, the switching piece 5 is provided with a supporting part 51 extending towards the pole hole 21, the extending direction of the supporting part 51 is parallel to the second end surface, the supporting part 51 is electrically connected with the pole 3, and the supporting part 51 and the second end surface are separated to form an assembly interval; the seal 4 is fitted around the radial outer periphery of the pole 3 and is fitted into the fitting space.

On the basis of the above structure, when the cover plate assembly 1 of the present utility model is used, the top cover 2 uses the large surface facing away from the battery cell as the first end surface, and uses the large surface facing toward the battery cell as the second end surface, and the lower plastic member 7 is mounted on the second end surface of the top cover 2 when the cover plate assembly 1 is assembled. The pole 3 passes through the pole hole 21 of the top cover plate 2, and then the sealing element 4 is sleeved into the pole 3 from the lower part, so that the radial outer peripheral surface of the sealing element 4 is tightly attached to the hole wall of the pole hole 21 corresponding to the top cover plate 2, the assembly of the pole 3 and the top cover plate 2 is realized, and the insulation and sealing effects between the pole 3 and the top cover plate 2 are realized; the support portion 51 of the switching piece 5 is electrically connected with the pole 3 and abuts against the lower end of the sealing member 4.

In this way, the sealing member 4 is mounted in the assembly space formed between the supporting portion 51 of the switching piece 5 and the top cover piece 2, and the sealing member 4 is pressed upward against the top cover piece 2 and downward against the supporting portion 51 because the sealing member 4 has a certain compression amount, so that the sealing effect of the sealing member 4 can be ensured.

In addition, the sealing piece 4 takes the top cover piece 2 and the switching piece 5 as supports to ensure the compression amount, so that the height space wasted when the pole 3 is taken as the support is saved, the assembly among the components of the cover plate assembly 1 is more compact, and the energy density of the battery cell is improved; moreover, the originally wasted height space can be used for increasing the thickness of the switching piece 5, thereby increasing the overcurrent capacity of the switching piece 5 so as to be suitable for a higher-volt-number use level platform; and the thicker switching piece 5 is more favorable for welding or riveting the supporting part 51 and the pole 3, so that the electric connection effect between the switching piece 5 and the pole 3 is improved.

It should be noted that, the cover plate assembly 1 further includes an upper plastic member 6 and a riveting block 8, the riveting block 8 is connected with the top of the pole 3, and the upper plastic member 6 is disposed between the top cover plate 2 and the riveting block 8 to play a role in insulation between the top cover plate 2 and the riveting block 8.

The material of the seal 4 is preferably an elastic material having good toughness, such as a rubber material. Specifically, the sealing member 4 may be a sealing ring made of an elastic material, the sealing ring is sleeved on the pole 3, the inner circumferential surface of the sealing ring is tightly attached to the radial outer circumferential surface of the pole 3, and the outer circumferential surface of the sealing ring is tightly attached to the inner wall of the pole hole 21 of the top cover plate 2. Thus, when the sealing ring is mounted at the assembly interval, the sealing ring is pressed to the periphery to fill gaps between the top cover plate 2 and the adapter plate 5 and between the top cover plate 2 and the pole 3, thereby forming a seal.

Further, the supporting portion 51 extends to the lower portion of the pole hole 21, and a through mounting hole is provided on the supporting portion 51, and the mounting hole is arranged corresponding to the pole hole 21, so that the pole 3 can be inserted into the mounting hole after being mounted in the pole hole 21; the sealing member 4 is sleeved on the radial periphery of the pole 3 and then is installed in the assembly space, and the sealing member 4 is respectively abutted against the second end face and the supporting portion 51 in the assembly space, so that sealing surfaces are formed between the sealing member 4 and the supporting portion 51 and between the sealing member 4 and the second end face.

On the basis of the structure, when in assembly, the upper plastic part 6 and the lower plastic part 7 are respectively arranged on the first end face and the second end face of the top cover sheet 2 so as to insulate the pole 3 from the top cover sheet 2; the pole 3 passes through the pole hole 21, and then the sealing element 4 is sleeved into the pole 3 from the lower part, so that the radial outer peripheral surface of the sealing element 4 is tightly attached to the hole wall of the pole hole 21 corresponding to the top cover piece 2, the assembly of the pole 3 and the top cover piece 2 is realized, and the insulation and sealing effects between the pole 3 and the top cover piece 2 are realized;

the mounting hole of the supporting part 51 is matched with the pole 3 from the lower part, and specifically, the mounting hole is electrically connected with the pole 3 in a welding or riveting mode; in this way, after the rotor plate 5 and the pole 3 are mounted, the seal member 4 is sandwiched in the fitting space formed between the support portion 51 and the top cover plate 2.

In this way, since the sealing member 4 is installed before the adapter piece 5 is installed in the assembly process, the compression amount of the sealing member 4 can be adjusted after the sealing member 4 is installed, so that after the adapter piece 5 is installed, the sealing member 4 is pressed up against the top cover plate 2 and is pressed down against the supporting portion 51 due to a certain compression amount of the sealing member 4, and sealing surfaces are formed between the sealing member 4 and the supporting portion 51 and between the sealing member 4 and the second end face, so that the overall air tightness of the cover plate assembly 1 is ensured, and electrolyte leakage is prevented.

Further, the sealing member 4 has a first sealing section and a second sealing section, the first sealing section and the second sealing section are engaged with each other, the first sealing section is provided in an assembly space formed by a space between the top cover sheet 2 and the adapter sheet 5, and the second sealing section is sandwiched between an inner wall of the pole hole 21 and the pole 3.

Based on the structure, the sealing element 4 is in an L-shaped structure, when the sealing element 4 is assembled, the pole 3 is sleeved in from the lower part, a second sealing section at the upper end of the sealing element 4 firstly stretches into the space between the hole wall of the pole hole 21 and the pole 3, the inner peripheral surface of the second sealing section is tightly attached to the radial outer peripheral surface of the pole 3, and the outer peripheral surface of the second sealing section is tightly attached to the hole wall of the pole hole 21; the first seal section of sealing member 4 lower extreme stretches into between plastic part 7 and the utmost point post 3 down, and the up end of first seal section supports with top cap piece 2 and leans on, waits after the third terminal surface of plastic part 7 down is installed to the switching piece 5, and the lower terminal surface of first seal section supports with the installation department of switching piece 5.

The second seal section is formed as a vertical seal section, and the first seal section is formed as a lateral seal section. The seal sections form an integral and continuous axial radial layout, and the seal has excellent seal effect. Since the sealing member 4 has a certain compression amount, after the sealing member 4 is mounted at the assembly interval, the sealing member 4 can be extruded all around, so that gaps among the inner parts of the cover plate assembly 1 are filled, and the cover plate assembly 1 has tightness.

In addition, in comparison with the prior art in which the pole 3 is used as a support for the seal 4, the present utility model uses the switching piece 5 instead of the pole 3 as a support for the seal 4, and the present utility model omits the height space wasted when the pole 3 is used as a support, but the requirement for the connection strength between the switching piece 5 and the pole 3 is also higher when assembling the respective components.

Since the sealing member 4 has a certain compression amount, when the sealing member 4 is arranged in the assembly interval, the sealing member 4 is pressed to the periphery, so that downward pressure is applied to the supporting portion 51, if the connection strength between the switching piece 5 and the pole 3 is low, the switching piece 5 may gradually separate from the pole 3 under long-term pressing of the sealing member 4, and therefore the connection between the switching piece 5 and the pole 3 is disabled.

Therefore, the lower end of the pole 3 is riveted with the switching piece 5, the connection strength of the pole 3 and the switching piece 5 can be enhanced, so that the pole 3 and the switching piece 5 are not easily separated.

The following description will take, as an example, different connection modes of the pole 3 and the switching piece 5:

in the case of example 1,

in the present embodiment, the pole 3 includes a lower caulking portion provided at one end of the pole 3 near the switching piece 5; the support part 51 of the switching piece 5 is provided with a mounting hole for penetrating through the pole 3, and the lower riveting part is used for riveting with the mounting hole so as to electrically connect the switching piece 5 with the pole 3; wherein the outer diameter of the lower caulking portion does not exceed the inner diameter of the pole hole 21.

Before the assembly of the respective parts, the top of the pole 3 and the caulking block 8 are connected together, and specifically, the top of the pole 3 and the caulking block 8 may be first caulking, or the top of the pole 3 and the caulking block 8 may be integrally formed.

On the basis of the structure, during assembly, since the outer diameter of the lower riveting part does not exceed the inner diameter of the pole hole 21, the pole 3 can be installed into the pole hole 21 from the upper part of the top cover sheet 2, and the specific assembly process is as follows: the upper plastic part 6 is firstly arranged above the top cover sheet 2, the pole 3 passes through the pole hole 21 of the top cover sheet 2 from the upper side of the top cover sheet 2, the sealing part 4 is sleeved into the pole 3 from the lower side of the pole 3, the lower plastic part 7 is arranged below the top cover sheet 2, and finally the lower end of the pole 3 is riveted with the mounting hole of the rotating sheet 5.

In this way, the lower end of the pole 3 and the switching piece 5 achieve a better connection effect in a riveting mode, and the problem that the switching piece 5 is separated from the pole 3 due to the fact that the supporting portion 51 is extruded by the sealing piece 4 for a long time can be avoided. In addition, the radial outer peripheral surface of the lower end of the pole 3 is tightly attached to the inner wall of the adapter piece 5, so that the contact area between the pole 3 and the adapter piece 5 can be increased, and the overcurrent capacity of the contact surface can be increased.

Further, after the lower caulking portion is caulking with the mounting hole, the lower caulking portion is welded with the supporting portion 51.

Since the cover plate assembly 1 is assembled with the battery case and the lower rivet portion and the mounting hole are close to the direction of the battery cell, after the lower rivet portion and the mounting hole are riveted, gaps may exist on the riveted contact surface, electrolyte in the battery cell is easy to leak from the gaps, and air tightness is difficult to ensure.

Therefore, after the lower riveting part and the mounting hole are riveted, butt welding is performed on the gap of the riveted contact surface, so that the welding part is melted to form a welding line, and the welding line fills the gap between the lower riveting part and the inner wall of the mounting hole. Thus, the overcurrent capacity of the contact part of the lower riveting part and the adapter piece 5 can be ensured, and the overall air tightness can be ensured.

In the case of example 2,

referring to fig. 3, in the present embodiment, the pole 3 includes an upper caulking portion and a lower caulking portion, which are disposed at both ends of the pole 3 in the axial direction; the cover plate assembly 1 comprises a riveting block 8, and a supporting portion 51 is provided with a mounting hole for penetrating through the pole 3, wherein an upper riveting portion is riveted with the riveting block 8, and a lower riveting portion is riveted with the mounting hole. For ease of assembly, the outer diameter of both the upper and lower stakes does not exceed the inner diameter of the post hole 21.

On the basis of this structure, since the outer diameters of the upper caulking portion and the lower caulking portion do not exceed the inner diameter of the pole hole 21 at the time of assembling, there is no requirement of the assembling direction at the time of assembling the pole 3, and the pole 3 can be fitted into the pole hole 21 from above or below the top cover sheet 2.

The specific assembly process comprises the steps of firstly installing an upper plastic part 6 above a top cover sheet 2, then penetrating a pole 3 from the upper side or the lower side of the top cover sheet 2 through a pole hole 21 of the top cover sheet 2, sleeving a sealing part 4 into the pole 3 from the lower side of the pole 3, installing a lower plastic part 7 below the top cover sheet 2, and riveting a lower riveting part of the pole 3 with an installation hole of a rotating sheet 5; finally, the upper caulking portion of the pole 3 is caulking-jointed with the caulking block 8.

In embodiment 1, the top of the pole 3 and the rivet block 8 are assembled together in advance, and then assembled with the top cover 2, and since the overall outer diameter of the pole 3 and the rivet block 8 assembled together exceeds the inner diameter of the pole hole 21, there is a requirement for the assembly direction when assembling, and the lower end of the pole 3 needs to be installed into the pole hole 21 from above the top cover 2; after the assembly, the riveting block 8 is positioned above the pole hole 21 and is abutted against the upper plastic part 6.

In the present embodiment, since the two ends of the pole 3 in the axial direction are first installed into the pole hole 21 and are respectively riveted, the pole 3 can be installed into the pole hole 21 from above or below the top cover sheet 2 without the requirement of the assembly direction; so that the assembly is more convenient.

Since a gap may exist at the riveted contact surface after the lower rivet portion is riveted with the mounting hole, the airtightness of the cap assembly 1 is difficult to be ensured.

Therefore, butt welding is required to be carried out on the riveted contact surface, so that the welding part is melted to form a welding line, and the welding line fills the gap between the lower riveting part and the inner wall of the mounting hole. Thus, the overcurrent capacity of the contact part of the lower riveting part and the adapter piece 5 can be ensured, and the overall air tightness can be ensured.

In the case of example 3,

in this embodiment, the pole 3 includes an upper caulking portion and a lower caulking portion, which are distributed at both ends of the pole 3 in the axial direction; the cover plate assembly 1 comprises a riveting block 8, an upper riveting part is riveted with the riveting block 8, and a lower riveting part is integrally formed with the adapter piece 5; wherein the outer diameter of the upper caulking portion does not exceed the inner diameter of the pole hole 21.

Before assembling the components of the cover assembly 1, the lower caulking portion of the pole 3 and the adapter piece 5 are integrally connected, specifically, the lower caulking portion of the pole 3 and the mounting hole of the support portion 51 may be caulking-connected, or the lower end of the pole 3 and the adapter piece 5 may be integrally formed.

On the basis of the structure, during assembly, since the outer diameter of the upper riveting part does not exceed the inner diameter of the pole hole 21, the pole 3 can be installed into the pole hole 21 from the lower part of the top cover sheet 2, and the specific assembly process is as follows: firstly, mounting a lower plastic part 7 below a top cover sheet 2, sleeving a sealing part 4 into a pole 3 from above the pole 3, then penetrating the pole 3 from below the top cover sheet 2 through a pole hole 21 of the top cover sheet 2, and mounting the pole 3 into the pole hole 21, then mounting an adapter piece 5 below the lower plastic part 7; then, the upper plastic member 6 is mounted above the top cover sheet 2, and finally, the upper riveting part of the pole 3 is riveted with the riveting block 8.

In this embodiment, the lower end of the pole 3 and the adapter piece 5 are integrally formed or connected together in a riveting manner, so that a better connection effect can be achieved, and the problem that the adapter piece 5 is separated from the pole 3 due to the fact that the supporting portion 51 is extruded by the sealing member 4 for a long time can be avoided.

When the pole 3 and the switching piece 5 are connected in an integrally formed manner, no gap exists between the pole 3 and the switching piece 5, and the contact surface of the pole 3 and the switching piece 5 does not need to be welded.

In this example, the lower end of the pole 3 is integrally connected to the switching piece 5 in advance, so that the assembly direction is required when the top cover piece 2 is assembled, which is inconvenient in comparison with the embodiment of example 2. However, when the lower end of the pole 3 is connected with the adapter piece 5 in advance, other parts of the cover plate assembly 1 do not need to be considered during riveting, and the assembly strength can be properly increased, so that the pole 3 is more tightly connected with the mounting hole of the adapter piece 5, and the connection strength is improved.

In some embodiments, referring to fig. 4, the supporting portion 51 extends below the sealing member 4 and covers the pole 3, and the lower end surface of the pole 3 is welded to the supporting portion 51 to achieve electrical connection; the seal 4 is mounted against the second end face and the support portion 51, respectively, in the assembly space so that sealing surfaces are formed between the seal 4 and the support portion 51 and between the seal 4 and the second end face.

On the basis of the structure, the support part 51 is not provided with a mounting hole for mounting the pole 3, so that the lower end surface of the pole 3 can directly abut against and be welded with the support part 51, the electric connection between the pole 3 and the adapter piece 5 is realized, and then the pole 3 is assembled with other components.

When the cover plate assembly 1 is assembled, the sealing element 4 can be sleeved into the pole 3 from the upper part, and then the pole 3 passes through the pole hole 21 from the lower part of the top cover plate 2, so that the assembly of the pole 3 and the top cover plate 2 is realized; wherein, the radial outer peripheral surface of the sealing element 4 is tightly attached to the hole wall of the pole hole 21, and plays a role in insulation and sealing between the pole 3 and the top cover sheet 2; and then the upper plastic part 6 is mounted above the top cover sheet 2, and finally the upper riveting part of the pole 3 is riveted with the riveting block 8.

The difference between this embodiment and the above-described embodiments 1, 2 and 3 is that the support portion 51 of the adapter piece 5 in this embodiment is not provided with a mounting hole, so that the overcurrent capacity of the adapter piece 5 is increased; during assembly, the lower end face of the pole 3 and the upper end face of the supporting portion 51 are welded, thereby achieving fixation and electrical connection.

Further, this embodiment provides a battery, including battery case, electric core and the apron subassembly 1 among above-mentioned embodiment 1, embodiment 2 and the embodiment 3, the battery case is equipped with electric core chamber and the opening that are linked together, and electric core is installed into electric core intracavity by the opening, and apron subassembly 1 closing cap is in the opening part to ensure the leakproofness of battery.

When in assembly, the lug of the battery core is electrically connected with the adapter piece 5 of the cover plate assembly 1, and specifically, the lug can be welded or riveted with the adapter piece 5; and then the cover plate component 1 is lifted to drive the battery cells to move together, so that the battery cells are installed in the battery shell, the cover plate component 1 covers the opening of the battery shell, and the peripheral edge of the top cover sheet 2 is welded and fixed with the inner periphery of the battery shell.

After the battery cell, the battery shell and the cover plate assembly 1 are assembled, electrolyte is injected into the battery shell through the liquid injection hole in the cover plate assembly 1. During the use and transportation of the battery, severe shaking may occur, if the air tightness of the cover plate assembly 1 is insufficient, electrolyte in the battery case may leak out of the case along gaps between the components in the cover plate assembly 1, resulting in a decrease in electrolyte in the case, and the electrolyte leaks out and corrodes other metal components.

The sealing element 4 of the utility model can fill gaps between the top cover plate 2 and the pole 3 and between the top cover plate 2 and the adapter plate 5 by being axially and radially distributed among the components, plays an insulating role, and can ensure air tightness and prevent electrolyte from leaking.

It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the utility model as defined in the appended claims.

Claims

1. A cover plate assembly (1) is characterized by comprising,

the top cover piece (2), wherein the top cover piece (2) is provided with a pole hole (21), and a pole (3) is arranged in the pole hole (21); the top cover sheet (2) is provided with a first end face and a second end face which are oppositely arranged;

the lower plastic part (7), the said lower plastic part (7) locates the said second end; the lower plastic part (7) is provided with a third end surface far away from the second end surface; the pole hole (21) penetrates to the third end face;

the switching piece (5) is arranged on the third end face; the adapter piece (5) is provided with a supporting part (51) extending towards the pole hole (21), and the extending direction of the supporting part (51) is parallel to the second end face; the supporting part (51) is electrically connected with the pole (3); the supporting part (51) and the second end surface are separated to form an assembly interval;

and the sealing piece (4) is sleeved on the radial periphery of the pole (3) and is arranged in the assembly interval.

2. The cover plate assembly (1) according to claim 1, wherein the supporting portion (51) extends below the pole hole (21), and a mounting hole is formed in the supporting portion (51), and is arranged corresponding to the pole hole (21) and is used for penetrating through the pole (3); the sealing element (4) is respectively abutted against the second end face and the supporting part (51) in the assembly interval, so that a sealing surface is formed between the sealing element (4) and the supporting part (51) and between the sealing element (4) and the second end face.

3. The cover plate assembly (1) according to claim 2, wherein the seal (4) has a first seal section and a second seal section, the first seal section being arranged in the assembly space, the second seal section being sandwiched between an inner wall of the pole bore (21) and the pole (3).

4. The cover plate assembly (1) according to claim 1, wherein the pole (3) comprises a lower riveting part, the lower riveting part is arranged at one end of the pole (3) close to the adapter piece (5), the supporting part (51) is provided with a mounting hole for penetrating through the pole (3), the lower riveting part is used for riveting with the mounting hole, and the outer diameter of the lower riveting part does not exceed the inner diameter of the pole hole (21).

5. The cover plate assembly (1) according to claim 4, wherein the lower rivet is welded with the support (51).

6. The cover plate assembly (1) according to claim 1, wherein the pole (3) comprises an upper rivet and a lower rivet, the upper rivet and the lower rivet being distributed at both ends of the pole (3) in the axial direction; the cover plate assembly (1) comprises a riveting block (8), the upper riveting part is riveted with the riveting block (8), the supporting part (51) is provided with a mounting hole for penetrating the pole (3), and the lower riveting part is riveted with the mounting hole; the outer diameter of the upper riveting part and the outer diameter of the lower riveting part do not exceed the inner diameter of the pole hole (21).

7. The cover plate assembly (1) according to claim 6, wherein the lower rivet is welded with the support (51).

8. The cover plate assembly (1) according to claim 1, wherein the pole (3) comprises an upper rivet and a lower rivet, the upper rivet and the lower rivet being distributed at both ends of the pole (3) in the axial direction; the cover plate assembly (1) comprises a riveting block (8), the upper riveting part is riveted with the riveting block (8), and the lower riveting part and the adapter piece (5) are integrally formed; the external diameter of the upper caulking portion does not exceed the internal diameter of the pole hole (21).

9. The cover plate assembly (1) according to claim 1, wherein the support (51) extends below the seal (4) and covers the pole (3), the lower end face of the pole (3) being welded to the support (51); the sealing element (4) is respectively abutted against the second end face and the supporting part (51) in the assembly interval, so that a sealing surface is formed between the sealing element (4) and the supporting part (51) and between the sealing element (4) and the second end face.

10. A battery comprising a battery housing, a battery cell and a cover assembly (1) according to any of claims 1-9, the battery housing being provided with a battery cell cavity and an opening; the opening is communicated with the electric core cavity; the cover plate component (1) is covered on the opening.