CN219832843U

CN219832843U - Cover plate assembly, battery pack and power utilization device

Info

Publication number: CN219832843U
Application number: CN202321284743.7U
Authority: CN
Inventors: 徐同力; 李龙; 徐檑
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2023-05-24
Filing date: 2023-05-24
Publication date: 2023-10-13
Anticipated expiration: 2033-05-24

Abstract

The utility model provides a cover plate assembly, a battery pack and an electricity utilization device, and belongs to the technical field of power batteries. The cover plate component comprises a light aluminum sheet, a pole body, an insulating sealing piece and an insulating gasket. According to the utility model, after the column body of the pole body passes through the pole body hole of the aluminum plate, the insulating gasket clung to the column body is sleeved on the column body to carry out a stamping process and form the protruding part, the protruding part and the base of the pole body are respectively limited on the inner side and the outer side of the aluminum plate, and the gap between the pole body and the aluminum plate is filled through the insulating sealing piece. According to the utility model, the stamping pressure is dispersed through the insulating gasket, so that the direct damage to the aluminum sheet caused by the stamping process is relieved; in addition, the minimum outer diameter which is required to be extended by the protruding part is reduced, so that the material cost and the stamping difficulty are reduced, and the protruding part is formed more regularly. The battery, the battery pack and the power utilization device provided by the utility model comprise the cover plate assembly, and can achieve the technical effects of the cover plate assembly.

Description

Cover plate assembly, battery pack and power utilization device

Technical Field

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

Background

At present, due to the development of new energy automobile technology, the power battery including the lithium ion battery is provided with continuously increased performance requirements. The battery cell is used as a core component of the power battery, and structurally mainly comprises an external insulating component, a packaged pole group part, a cover plate, an internal insulating component and an electric connecting component, wherein the cover plate mainly comprises a cover plate body and an anode pole and a cathode pole connected to the cover plate body, the whole of each pole can be divided into an internal pole part positioned in the battery cell and an external pole part positioned outside the battery cell, and the pole group in the battery cell is connected with the internal pole of the battery cell so as to respectively lead out the anode and the cathode of the battery cell.

In the current phase, in the battery cell cover plate, the pole is connected to the cover plate body and is mostly in a riveting structure, the riveting blocks are respectively arranged at the positions of the positive pole and the negative pole on the cover plate body, the riveting holes are respectively arranged on the riveting blocks, and the positive pole and the negative pole are respectively in riveting fit with the riveting holes on the corresponding riveting blocks.

However, the cover plate body can be easily damaged by directly stamping the pole after the pole penetrates through the cover plate body, and the outer diameter of the protruding part on the peripheral surface of the pole is at least required to be larger than the aperture of the pole hole, so that the pole reserves more parts for stamping, and the material cost is increased; in addition, the larger the minimum outer diameter that the protruding part needs to extend to, the higher the stamping difficulty, the more irregular the protruding part is easy to form, and the flash appears.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is that in the prior art, the flange of the pole is directly stamped to limit, the cover plate is easy to damage, the minimum outer diameter of the flange required to be extended is large, and the material cost and stamping difficulty are increased.

In order to solve the above technical problems, in a first aspect, the present utility model provides a cover plate assembly, which includes an aluminum sheet, a pole body, an insulating sealing member and an insulating spacer.

The light aluminum sheet is provided with an inner side surface and an outer side surface, and a pole hole penetrating through the inner side surface and the outer side surface; the pole column body comprises a base and a column body, the column body penetrates through the pole column hole from the inner side of the aluminum sheet, a protruding part which is stamped and formed inwards is arranged at the position of the column body, which is positioned at the outer side of the aluminum sheet, and the protruding part radially extends from the circumferential surface of the column body; the base and the bulge are respectively limited on the inner side and the outer side of the aluminum sheet; the insulation sealing piece seals the gap between the circumferential wall of the column body and the hole wall of the pole body and insulates the pole body and the aluminum sheet; the insulating gasket is sleeved on the column body and is abutted between the protruding portion and the insulating sealing piece, and the inner diameter of the insulating gasket is smaller than the aperture of the pole column hole so as to reduce the minimum outer diameter which is required to be extended by the protruding portion.

Optionally, the insulating gasket comprises an inner ring part and an outer ring part, and a connecting part axially connected between the inner ring part and the outer ring part, and the connecting part is suitable for arranging the inner ring part and the outer ring part in a staggered manner; the inner diameter of the inner ring part is smaller than the aperture of the pole hole, and the inner ring part is abutted against the surface of the bulge part, which faces to one side of the aluminum sheet; the connecting part is abutted with the circumferential outer edge of the protruding part; the outer ring portion extends in a radial direction toward a side away from the inner ring portion.

Optionally, the upper surface of the outer ring portion is not higher than the upper surface of the boss portion.

Optionally, the insulating sealing member comprises an upper plastic pad, an insulating sealing ring and a lower plastic pad.

The upper plastic pad is sleeved on the column body through the first avoiding hole and is squeezed between the protruding part and the outer side surface of the aluminum sheet; the insulating sealing ring is at least wrapped at the part of the column body positioned in the pole column hole; the lower plastic pad is sleeved on the column body through a second avoidance hole and is squeezed between the base and the inner side surface of the aluminum sheet; the lower plastic pad is matched with the upper plastic pad to limit the axial direction of the pole body in a squeezed mode, and the inner side surface and the outer side surface of the pole body and the aluminum sheet are isolated in an insulating mode; the insulating sealing ring seals the gap between the peripheral wall of the column body and the hole wall of the pole column hole and insulates the pole column body and the pole column hole of the light aluminum sheet in an insulating way.

Optionally, the insulating sealing ring is provided with an abutting part which is abutted between the column body and the pole hole along the radial direction, and a folded edge which extends from the abutting part along the radial direction towards the direction far away from the column body, and the folded edge is arranged between the aluminum sheet and the base.

Optionally, the insulating spacer comprises a stainless steel material.

Optionally, the pole body of the negative electrode is of a copper-aluminum composite plate type structure.

In a second aspect, the present utility model provides a battery, including a housing with at least one opening, and a cover assembly according to any one of the first aspect, where the cover assembly covers the opening of the housing.

In a third aspect, the present utility model provides a battery pack comprising the battery of the second aspect.

In a fourth aspect, the present utility model provides an electrical device comprising: an electric device body, and a battery pack as described in the third aspect electrically connected to the electric device body.

The technical scheme of the utility model has the following advantages:

1. according to the cover plate assembly provided by the utility model, the column body of the pole column body passes through the pole column hole of the aluminum plate, the insulating gasket clung to the column body is sleeved on the column body for stamping, the bulge part is formed on the insulating gasket, the bulge part and the base are respectively limited on the inner side and the outer side of the aluminum plate, and the gap between the pole column body and the aluminum plate is filled through the insulating sealing piece, so that the effects of tightening, fixing, insulating isolation and sealing are achieved. According to the utility model, the insulating gasket is sleeved before the pole is stamped, so that the insulating gasket is positioned between the aluminum sheet and the bulge, the stamping pressure is dispersed, and the direct damage to the aluminum sheet caused by the stamping process is relieved; in addition, the inner diameter of the insulating gasket is smaller than the aperture of the pole hole, so that the outer diameter of the protruding part only needs to be extended to be larger than the inner diameter of the insulating gasket, and the minimum outer diameter of the protruding part which is required to be extended is reduced, thereby reducing the material cost and the stamping difficulty, and enabling the protruding part to be formed more regularly.

2. According to the cover plate assembly provided by the utility model, the inner ring part and the connecting part of the insulating gasket are used for providing guidance and limiting for the extension of the protruding part, and meanwhile, the cover plate assembly plays a role of coating the protruding part, so that the protruding part is formed more regularly; the outer ring part of the insulating gasket extends the outer ring edge of the protruding part in a phase-changing way, so that the protruding part is more stably limited on the outer side of the aluminum sheet.

3. According to the cover plate assembly provided by the utility model, the lower plastic pad is matched with the upper plastic pad to limit the axial direction of the pole body in a squeezed mode, and the pole body and the inner side surface and the outer side surface of the aluminum sheet are isolated in an insulating mode; the insulating sealing ring seals the gap between the peripheral wall of the column body and the hole wall of the pole column hole and insulates the pole column body and the pole column hole of the light aluminum sheet in an insulating way. In addition, bottom of insulating sealing washer is equipped with the hem that laminates mutually with light aluminum sheet medial surface in order to increase sealed effect.

4. According to the cover plate assembly provided by the utility model, the electrode column body of the negative electrode adopts the structure of the copper-aluminum composite plate to replace a copper-aluminum friction welding process, so that the structure of the negative electrode is more stable, the fracture risk is eliminated, in addition, the process is simplified, and the processing cost is reduced.

5. The battery, the battery pack and the power utilization device provided by the utility model have any one of the advantages of the cover plate assembly because the cover plate assembly is adopted.

Drawings

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

FIG. 1 is a schematic view of the overall structure of a cover plate assembly according to the present utility model;

FIG. 2 is an exploded view of the closure assembly shown in FIG. 1;

FIG. 3 is a bottom view of the cover plate assembly shown in FIG. 1;

FIG. 4 is a top view of the cover plate assembly shown in FIG. 1;

FIG. 5 is a cross-sectional view taken at A-A of FIG. 4;

FIG. 6 is an enlarged view at B in FIG. 5;

FIG. 7 is a schematic view of a pole body according to the present utility model;

FIG. 8 is a schematic diagram of an insulating spacer according to the present utility model;

fig. 9 is a schematic structural diagram of an insulating sealing ring provided by the utility model.

Reference numerals illustrate:

1-a light aluminum sheet; 11-pole holes; 12-a rotation stopping groove; 13-valve hole; 14-a limit groove; 2-pole body; 21-a base; 22-column; 221-a boss; 3-insulating seals; 31-applying a plastic pad; 32-insulating sealing rings; 321-an abutment; 322-flanging; 33-lower plastic pad; 4-insulating spacers; 41-an inner ring portion; 42-an outer ring portion; 43-connection; 5-an explosion-proof valve; 6-explosion-proof valve patch.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

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.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

An embodiment of the cover plate assembly of the present utility model, referring to fig. 1 to 7, includes a photo-aluminum sheet 1, a pole body 2, an insulating sealing member 3, and an insulating spacer 4.

Wherein the aluminum sheet 1 has an inner side and an outer side, and a post hole 11 penetrating the inner side and the outer side; the pole body 2 comprises a base 21 and a pole body 22, the pole body 22 passes through the pole body hole 11 from the inner side of the aluminum sheet 1, and the part of the pole body 22 positioned at the outer side of the aluminum sheet 1 is provided with a bulge 221 punched inwards, and the bulge 221 radially extends from the peripheral surface of the pole body 22; the base 21 and the boss 221 are respectively limited at the inner and outer sides of the aluminum sheet 1; the insulating sealing piece 3 seals the gap between the peripheral wall of the column 22 and the hole wall of the pole hole 11 and insulates the pole column 2 and the aluminum sheet 1; the insulating spacer 4 is sleeved on the column 22 and is abutted between the protruding portion 221 and the insulating sealing member 3, and the inner diameter of the insulating spacer 4 is smaller than the aperture of the post hole 11 so as to reduce the minimum outer diameter of the protruding portion 221 required to extend.

In actual use, after the column 22 of the pole column 2 passes through the pole column hole 11 of the aluminum plate 1, the insulating gasket 4 closely attached to the column 22 is sleeved on the column 22 for stamping, the insulating gasket 4 is provided with the protruding part 221, the protruding part 221 and the base 21 are respectively limited on the inner side and the outer side of the aluminum plate, and gaps between the pole column 2 and the aluminum plate are filled through the insulating sealing piece 3, so that the effects of tightening, fixing, insulating isolation and sealing are achieved. In the embodiment, the insulating gasket 4 is sleeved before the pole is stamped, so that the insulating gasket 4 is positioned between the aluminum flake 1 and the bulge 221, the stamping pressure is dispersed, and the direct damage to the aluminum flake 1 caused by the stamping process is relieved; in addition, the inner diameter of the insulating gasket 4 is smaller than the aperture of the pole hole 11, so that the outer diameter of the protruding part 221 only needs to be extended to be larger than the inner diameter of the insulating gasket 4, and the minimum outer diameter which is required to be extended to be reached by the protruding part 221 is reduced, thereby reducing the material cost and the stamping difficulty, and enabling the protruding part 221 to be formed more regularly.

Specifically, the radial section of the base 21 is non-circular, such as rectangle, ellipse, etc., the inner side surface of the aluminum sheet 1 is provided with a rotation stopping groove 12 matched with the base 21 at the coaxial position of the pole hole 11, and the base 21 is positioned in the rotation stopping groove 12 to prevent the pole body 2 from rotating around the axis thereof; in addition, the outer side surface of the aluminum sheet 1 is provided with a limit groove 14 matched with the insulating gasket 4 at the coaxial position of the pole hole 11, and the insulating gasket 4 or the insulating sealing member 3 connected with the insulating gasket 4 is positioned in the limit groove 14 so that the position of the insulating gasket 4 is not easy to change during stamping. It can be understood with reference to fig. 5 and 6, wherein fig. 5 only retains the pole body 2 of the positive or negative pole, concealing the pole body 2 of the other pole to better show the structure of the pole body hole 11 in that pole.

More specifically, by adopting the scheme of the embodiment of the utility model, the height h1 of the pole body 2 is controlled within the range of 3.5-6.5mm, and is preferably 5.3mm in the embodiment; the outer pole height h2 is controlled in the range of 2-3mm, preferably 2.5mm in this embodiment. In addition, in order to ensure the structural strength and the overcurrent area of the subsequent battery cell, the width of the aluminum sheet 1 is set to d >30mm.

In various alternative implementations of the above embodiment, more preferably, referring to fig. 1 and 2 and fig. 6 and 8, the insulating spacer 4 includes an inner ring portion 41 and an outer ring portion 42, and a connecting portion 43 connected between the inner ring portion 41 and the outer ring portion 42 in the axial direction, the connecting portion 43 being adapted to provide the inner ring portion 41 and the outer ring portion 42 in a staggered manner; the inner diameter of the inner ring part 41 is smaller than the aperture of the pole hole 11, and the inner ring part 41 is abutted with the surface of the bulge part 221 facing to the aluminum sheet 1; the connecting portion 43 abuts against the circumferential outer edge of the boss 221; the outer ring portion 42 extends radially toward a side away from the inner ring portion 41. In the embodiment, the inner ring part 41 and the connecting part 43 of the insulating gasket 4 provide guiding and limiting for the extension of the protruding part 221, and simultaneously play a role in coating the protruding part 221, so that the protruding part 221 is formed more regularly; the outer ring part 42 of the insulating gasket 4 extends the outer ring edge of the protruding part 221 in a phase-changing manner, so that the protruding part 221 is more firmly limited on the outer side of the aluminum sheet 1. For ease of understanding, the insulating spacer 4 has a zigzag cross section.

It is further preferable that the upper surface of the outer ring portion 42 is not higher than the upper surface of the boss 221 in view of the realistic stamping process.

More preferably, as shown in fig. 2 and 6, the insulating seal 3 includes an upper plastic mat 31, an insulating seal 32, and a lower plastic mat 33.

With reference to fig. 6, the upper plastic pad 31 is sleeved on the column 22 through the first avoiding hole and is pressed between the protruding portion 221 and the outer side surface of the aluminum sheet 1; the insulating sealing ring 32 is at least wrapped on the part of the column 22 located in the pole hole 11; the lower plastic pad 33 is sleeved on the column 22 through a second avoidance hole and is squeezed between the base 21 and the inner side surface of the aluminum sheet 1; the lower plastic pad 33 is matched with the upper plastic pad 31 to limit the pole body 2 in a squeezing way in the axial direction, and the pole body 2 is isolated from the inner side and the outer side of the aluminum sheet 1 in an insulating way; the insulating seal ring 32 seals the gap between the peripheral wall of the column 22 and the wall of the pole hole 11 and insulates the pole column 2 from the pole hole 11 of the aluminum sheet 1. The insulating seal 3 also has a pressure-resistant and cushioning effect.

Further preferably, referring to fig. 6 and 9, the insulating seal 32 has an abutting portion 321 abutting between the post 22 and the post hole 11 in the radial direction, and a flange 322 extending from the abutting portion 321 in the radial direction away from the post 22, the flange 322 being disposed between the aluminum flake 1 and the base 21. The embodiment is attached to the inner side of the aluminum sheet 1 through the folded edge 322 to increase the sealing effect.

In various alternative implementations of the above embodiment, it is more preferable that the insulating spacer 4 is made of stainless steel material, which is a rigid and pressure-resistant material, enhancing the structural strength.

Preferably, the pole body 2 of the negative electrode is of a copper-aluminum composite plate type structure, so that a copper-aluminum friction welding process is replaced, the negative electrode structure is more stable, the fracture risk is eliminated, in addition, the process is simplified, and the processing cost is reduced.

Specifically, the middle part of the aluminum sheet 1 is provided with a valve hole 13 so as to be suitable for installing the explosion-proof valve 5, and the outer surface of the explosion-proof valve 5 is stuck with an explosion-proof valve patch 6 so as to be suitable for releasing the internal pressure by bursting the explosion-proof valve patch 6 when the gas accumulation in the battery is more, thereby reducing the risk of explosion of the battery.

On the basis of the embodiment of the cover plate assembly, the embodiment of the battery provided by the utility model comprises a shell with at least one surface open and the cover plate assembly in the embodiment, wherein the cover plate assembly is covered at the opening of the shell. Therefore, the battery in this embodiment includes at least all the advantages achieved by the cover plate assembly in the above embodiments. Similarly, the embodiment of the battery pack provided by the utility model comprises the battery in the embodiment; the embodiment of the power utilization device provided by the utility model comprises the power utilization device body and the battery pack in the embodiment, wherein the battery pack is electrically connected with the power utilization device body, so that the battery pack and the power utilization device in the embodiment also at least comprise all the beneficial effects achieved by the cover plate assembly in the embodiment.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. A cover plate assembly, comprising:

the aluminum sheet is provided with an inner side surface and an outer side surface, and a pole hole penetrating through the inner side surface and the outer side surface;

the pole column body comprises a base and a column body, the column body passes through the pole column hole from the inner side of the aluminum sheet, a protruding part is arranged at the position of the column body, which is positioned at the outer side of the aluminum sheet, and the protruding part extends along the radial direction from the circumferential surface of the column body; the base and the bulge are respectively limited on the inner side and the outer side of the aluminum sheet;

an insulating sealing member sealing a gap between the column peripheral wall and the pole hole wall and insulating the pole column and the aluminum sheet;

the insulating gasket is sleeved on the column body and is abutted between the protruding portion and the insulating sealing piece, and the inner diameter of the insulating gasket is smaller than the aperture of the pole column hole so as to reduce the minimum outer diameter which is required to be extended by the protruding portion.

2. The closure assembly of claim 1, wherein,

the insulating gasket comprises an inner ring part, an outer ring part and a connecting part connected between the inner ring part and the outer ring part along the axial direction, wherein the connecting part is suitable for enabling the inner ring part and the outer ring part to be arranged in a staggered manner; the inner ring part is abutted with the surface of the protruding part facing to one side of the aluminum sheet; the connecting part is abutted with the circumferential outer edge of the protruding part; the outer ring portion extends radially toward a side away from the inner ring portion.

3. The cover plate assembly of claim 2, wherein an upper surface of the outer race portion is not higher than an upper surface of the boss.

4. The cover plate assembly of claim 1, wherein the insulating seal comprises:

the upper plastic pad is sleeved on the column body through a first avoidance hole and is squeezed between the protruding part and the outer side surface of the aluminum sheet;

the insulating sealing ring is wrapped on the column body;

the lower plastic pad is sleeved on the column body through a second avoidance hole and is squeezed between the base and the inner side surface of the aluminum sheet;

the lower plastic pad is matched with the upper plastic pad to limit the pole column in a squeezing way in the axial direction, and the pole column is insulated from the inner side surface and the outer side surface of the aluminum sheet; the insulation sealing ring seals the gap between the circumferential wall of the column body and the wall of the hole of the pole body and insulates the pole body and the hole of the aluminum sheet in an insulation manner.

5. The closure assembly of claim 4, wherein,

the insulating sealing ring is provided with an abutting part which is abutted between the cylinder and the pole hole along the radial direction, and a folded edge which extends from the abutting part along the radial direction towards the direction far away from the cylinder, and the folded edge is arranged between the aluminum sheet and the base.

6. The cover plate assembly of claim 1, wherein the insulating spacer comprises a stainless steel material.

7. The cover plate assembly of claim 1, wherein the pole body of the negative electrode is a copper aluminum composite plate type structure.

8. A battery comprising a housing having at least one opening, and a cover assembly according to any one of claims 1 to 7, wherein the cover assembly covers the opening of the housing.

9. A battery pack comprising the battery of claim 8.

10. An electrical device, comprising: an electrical device body and a battery pack as claimed in claim 9 electrically connected to the electrical device body.