CN212303780U

CN212303780U - Power battery cover plate

Info

Publication number: CN212303780U
Application number: CN202020452789.5U
Authority: CN
Inventors: 曾志亮
Original assignee: Shenzhen Changying Hydrogen Power Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Ningde Changying New Energy Technology Co ltd; Shenzhen Changying Precision Technology Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-01-05
Anticipated expiration: 2030-03-31

Abstract

A power battery cover plate comprises a cover plate body, a pole ear hole formed by penetrating through the cover plate body, a pole ear and an insulator for fixing the pole ear in the pole ear hole, wherein the pole ear comprises a cylinder body and a clamping part formed by extending from the bottom along the radial direction, the cylinder body passes through the pole ear hole and is exposed on the top surface of the cover plate body, the clamping part is positioned below the bottom surface of the cover plate body, a waterproof ring is clamped between the clamping part and the bottom surface of the cover plate body, and the insulator is filled between the cylinder body and the cover plate body and fixes the cylinder body and the cover plate body into a whole; the power battery cover plate has good sealing performance.

Description

Power battery cover plate

Technical Field

The application relates to the field of power battery components, in particular to a power battery cover plate.

Background

Lithium batteries are widely used in various industries, 3C electronics, new energy vehicles, etc., and have great safety problems, such as fire, explosion, etc., due to their own characteristics. Particularly in the field of electric automobiles, batteries are used as key components of power output, and are concerned with the safety of vehicles and the life safety of people. The power battery cover plate is used as a core component of the battery pack, and the reliability of the power battery cover plate has great influence on the normal use of the automobile.

The cover plate of a general lithium ion power battery comprises a cover plate body, a tab, a liquid injection hole sealing element, an explosion-proof device and the like, wherein the tab is usually stably fixed on the cover plate body and is not in electrical contact with the cover plate body, and the tab is required to be sealed with the cover plate body. Adopt among the prior art to seal utmost point ear and the integrative injection moulding's of apron body mode, but under the influence of vehicle external force, the plastic between utmost point ear and the apron body is extremely easy to be out of shape and influences sealing performance. The injection assembly also needs to solve the problems of sealing and easy disassembly.

SUMMERY OF THE UTILITY MODEL

Therefore, it is necessary to provide a power battery cover plate with stable sealing performance between the tab and the cover plate body.

For solving above-mentioned technical problem, the application provides a power battery apron, include the apron body, run through utmost point ear hole, utmost point ear that the apron body formed and will utmost point ear fixing in the downthehole insulator of utmost point ear, utmost point ear include the cylinder and certainly the cylinder bottom extends the clamping part that forms along radial direction, the cylinder passes through utmost point ear hole exposes in the top surface of apron body, the clamping part is located the below of apron body bottom surface, the clamping part with the centre gripping has waterproof circle between the apron body bottom surface, the insulator fill in the cylinder with between the apron body and with the two fixing as an organic whole.

Preferably, the outer diameter of the cylinder is smaller than the inner diameter of the tab hole, and the insulator fills the space between the cylinder and the tab hole and forms a cylinder electrically isolating the cylinder from the cover plate body.

Preferably, the bottom of the cylinder body is located above the clamping part and extends outwards along the radial direction to form an inner covering part for isolating the bottom surface of the cover plate body from the clamping part, and the inner covering part is limited by the waterproof ring.

Preferably, the cartridge top is extended outward in a radial direction to form an outer cover covering the top surface of the deck body, and the outer diameter of the outer cover is greater than that of the inner cover.

Preferably, during injection molding of the insulator, the cover plate body and the tabs are placed in an injection mold for positioning, the waterproof ring is clamped between the bottom surface of the cover plate body and the clamping part, and molten plastic is injected from the top of the cover plate body to form the cylinder, the inner covering part and the outer covering part.

Preferably, the inner diameter of waterproof circle is greater than the inner diameter of utmost point ear hole, waterproof circle is arranged in when on the clamping part, waterproof circle is fixed in through glue on the clamping part, perhaps, be equipped with spacingly on the clamping part waterproof circle's ring channel.

The utility model provides a power battery apron is through the bottom formation ratio at utmost point ear the bigger clamping part of cylinder external diameter set up waterproof circle on the clamping part, when injection moulding, through clamping part and apron body bottom surface centre gripping waterproof circle realizes accomplishing before injection moulding the installation of waterproof circle realizes the dual antiseep of waterproof circle and insulator, simultaneously, flows through the spacing plastic of waterproof circle, has simplified injection mold.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a cross-sectional view of a power cell cover plate assembly of the present application;

FIG. 2 is a cross-sectional view of the cover plate body of the power battery cover plate of the present application;

FIG. 3 is an enlarged view of a portion of the power cell cover plate of the present application, shown in phantom at circle A in FIG. 1;

fig. 4 is a partially enlarged view of a dotted circle B shown in fig. 1 of the cover plate of the power battery of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, the power battery cover plate of the present application includes a cover plate body 10, a tab 50 integrally formed on the cover plate body 10, a liquid injection hole sealing element 40, and an explosion-proof device 30 disposed on the cover plate body 10.

Referring to fig. 2, the cover plate body 10 includes a tab hole 11 penetrating through the cover plate body 10, a liquid injection hole 12, an explosion-proof hole 13, and an insulating protection layer 20 covering an inner side surface of the cover plate body 10.

An insulator 60 for electrically isolating the cover plate body 10 from the tab 50 is integrally injection-molded in the tab hole 11. The insulator 60 includes a cylinder 61 located in the tab hole 11, an outer cover 62 formed on the outer surface of the cap body 10 to extend from the outside of the cylinder 61 to the outside, and an inner cover 63 formed on the inner surface of the cap body 10 to extend from the inside of the cylinder 61 to the outside. The outer cover 62 has an outer diameter larger than that of the inner cover 63. The height of the cylinder 61 is greater than the thickness of the cover body 10. The middle of the cylinder 61 forms a forming hole 64 for wrapping the tab 50.

The pour hole 12 is sealed by the pour hole sealing member 40, and the pour hole 12 includes a recessed portion 121 recessed inward, a bottom protruding portion 123, a hole structure 1222 penetrating the recessed portion 121 and the bottom protruding portion 123, and an inclined surface 124 formed on the outer periphery of the recessed portion 121.

The explosion-proof device 30 is installed on the explosion-proof hole 13.

As shown in fig. 3, the tab 50 includes a cylindrical body 51 having an upper end protruding from the top surface of the cylindrical body 61, and a clamping portion 52 extending radially outward from the bottom of the cylindrical body 51, wherein the outer diameter of the clamping portion 52 is larger than the outer diameter of the bottom protrusion 123, and the clamping portion 52 is located below the bottom protrusion 123. A waterproof ring 53 is further clamped between the clamping portion 52 and the bottom surface of the cover plate body 10, and the waterproof ring 53 is located on the periphery of the bottom protruding portion 123.

The manufacturing method of the power battery cover plate comprises the following steps:

s10, providing a tab 50, and placing a waterproof ring 53 positioned on the periphery of the cylinder 51 on the clamping part 52 of the tab 50;

in this step, the inner diameter of the waterproof ring 53 is larger than the outer diameter of the column 51, and a space is formed between the waterproof ring 53 and the outer surface of the column 51. The waterproof ring 53 may be fixed on the upper surface of the clamping portion 52 by a suitable method, such as using waterproof glue, or forming an annular groove on the upper surface of the clamping portion 52 to limit the waterproof ring 53.

S20, placing the cover plate body 10 and the tab 50 into an injection mold for injection molding to form the insulator 60 with the cover plate body 10 and the tab 50 spaced from each other, wherein in the injection molding process, the clamping part 52 of the tab 50 and the cover plate body 10 tightly clamp the waterproof ring 53.

In this step, molten plastic is injected into the gap between the tab 50 and the cover plate body 10 from above the cover plate body 10, so as to form an inner covering portion 62 between the clamping portion 52 and the bottom surface of the cover plate body 10, a cylinder 61 for isolating the tab 50 cylinder 51 from the tab hole 11 of the cover plate body 10, and an outer covering portion 62 covering the upper surface of the cover plate body 10. The inner covering part 63 is limited by the waterproof ring 53 to prevent the molten plastic from flowing out.

The utility model provides a power battery apron and manufacturing method thereof, through the bottom at utmost point ear 50 form than the bigger clamping part 52 of cylinder 51 external diameter set up waterproof circle 53 on the clamping part 52, when injection moulding, through clamping part 52 and the centre gripping of apron body 10 bottom surface waterproof circle 53 realizes accomplishing before injection moulding waterproof circle 53's installation realizes waterproof circle 53 and insulator 60's dual antiseep, simultaneously, flows through the spacing plastic of waterproof circle 53, has simplified injection mold.

As shown in fig. 4, the sealing member 40 of the injection hole of the present application includes a nut 41 fixed under the bottom protrusion 123, a screw 42 screwed into the nut 41, and a sealing ring 43 clamped between the screw 42 and the recess 121. The screw 42 comprises a screw 422 with an external thread and a head 421 located at the top of the screw 422, the outer diameter of the head 421 is larger than that of the screw 422, and the sealing ring 43 is sleeved outside the screw 422 and clamped between the recess 121 and the head 421 to realize water prevention. The outer side surface of the sealing ring 43 is provided with an inclined portion which is matched with the outer peripheral inclined surface 124 of the recessed portion 121 so that the sealing ring 43 is tightly attached to the recessed portion 121.

When liquid injection is needed, the screw 42 is unscrewed, and liquid can be injected through the liquid injection hole 122; when liquid injection is not needed, the screw 422 of the screw 42 passes through the liquid injection hole 122 of the concave part 121 and is screwed on the nut 41 to be fixed and clamp the sealing ring 43 to realize water prevention.

According to the power battery cover plate 10, the concave part 121 is arranged, so that the sealing ring 43 is tightly attached between the upper surface of the concave part 121 and the head 421 of the screw 42, and most of the sealing ring 43 is accommodated in the concave part 121 to protect the sealing ring 43.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. The utility model provides a power battery apron, includes the apron body, runs through utmost point ear hole, utmost point ear that the apron body formed and will utmost point ear immobilization in the downthehole insulator of utmost point ear, its characterized in that, utmost point ear include the cylinder and certainly the cylinder bottom extends the clamping part that forms along radial direction, the cylinder passes through utmost point ear hole exposes in the top surface of apron body, the clamping part is located the below of apron body bottom surface, the clamping part with the centre gripping has waterproof circle between the apron body bottom surface, the insulator fill in the cylinder with between the apron body and with the two immobilization as an organic whole.

2. The power cell cover plate of claim 1, wherein the post has an outer diameter less than an inner diameter of the tab hole, and the insulator fills the space between the post and the tab hole and forms a cylinder electrically isolating the post from the cover plate body.

3. The power battery cover plate of claim 2, wherein the bottom of the cylinder body is located above the clamping portion and extends outwards along a radial direction to form an inner covering portion for isolating the bottom of the cover plate body from the clamping portion, and the inner covering portion is limited by the waterproof ring.

4. The power cell cover plate of claim 3, wherein the top of the can extends outward in a radial direction to form an outer cover covering the top surface of the cover body, the outer cover having an outer diameter greater than an outer diameter of the inner cover.

5. The power battery cover plate of claim 4, wherein the cover plate body and the tab are positioned in an injection mold during injection molding of the insulator, the waterproof ring is clamped between the bottom surface of the cover plate body and the clamping portion, and the insulator fills the space between the tab and the cover plate body and forms the cylinder, the inner covering portion and the outer covering portion.

6. The cover plate for a power battery of claim 5, wherein the waterproof ring has an inner diameter larger than that of the pole ear hole, and when the waterproof ring is placed on the clamping portion, the waterproof ring is fixed on the clamping portion by glue.

7. The cover plate for power battery of claim 5, wherein the waterproof ring has an inner diameter larger than that of the pole ear hole, and when the waterproof ring is placed on the clamping portion, an annular groove for limiting the waterproof ring is formed on the clamping portion.