CN217009357U

CN217009357U - Power battery cover plate

Info

Publication number: CN217009357U
Application number: CN202123027010.9U
Authority: CN
Inventors: 曾志亮
Original assignee: Yibin Changying Precision Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Yibin Changying Precision Technology Co ltd; Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2021-12-01
Filing date: 2021-12-01
Publication date: 2022-07-19
Anticipated expiration: 2031-12-01

Abstract

The power battery cover plate comprises a base plate provided with an explosion-proof hole and an explosion-proof sheet fixed in the explosion-proof hole, wherein a step part with the surface lower than the surface of the base plate is arranged on the periphery of the explosion-proof hole, and a riveted part is formed by upwards protruding the periphery of the step part, the periphery of the explosion-proof sheet is supported on the step part, the riveted part is riveted and fastened above the explosion-proof sheet on the upper side of the step part, and the explosion-proof sheet is tightly clamped by the step part and the riveted part. The explosion-proof piece of this application power battery apron need not the welding, and the explosion-proof piece need not punching press precision finishing.

Description

Power battery cover plate

Technical Field

The present application relates to the field of audio communication, and more particularly, to a cover plate for a power battery.

Background

With the progress of materials and other technologies, the battery technology has made a great breakthrough, and the battery industry is in the air port. The power battery is different from the traditional energy storage battery, the power battery is widely used on the electric automobile, the requirements on energy storage density and safety are extremely high, a plurality of energy storage units are integrated in one battery box, and a plurality of battery boxes are integrated into a power battery unit. Chemical liquid is generally injected into each battery box, the battery boxes need to be sealed, meanwhile, the explosion of the battery boxes needs to be prevented, and the pressure release is required to be started when the internal pressure is small, so the battery boxes generally comprise a box body and a top cover which is assembled with the box body in a sealing mode, positive and negative electrodes, a liquid injection hole and an explosion-proof assembly are arranged on the top cover, the explosion-proof assembly generally adopts a thin metal sheet, nicks are arranged on the metal sheet, and when the internal pressure of the battery boxes reaches a certain value, the metal sheet for explosion prevention releases pressure to the outside along the nicks in a breaking mode, and the safety of the battery is ensured. The explosion-proof sheet on the existing battery top cover is generally welded on the edge of an explosion-proof hole on a top cover main body in a welding mode, the welding needs to ensure that the sealing is airtight, and the welding process is high. Meanwhile, the explosion-proof sheet is formed by punching a relatively thick metal sheet in the middle to form a thin part, a relatively high-precision punch is needed, and the cost is relatively high.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need for a power battery cover plate with simple manufacturing process and low cost.

In order to solve the technical problem, the application provides a power battery apron, including the base plate of seting up the explosion-proof hole and being fixed in explosion-proof piece in the explosion-proof hole, the explosion-proof hole periphery is equipped with the surface and is less than the step portion on base plate surface and certainly the step portion periphery upwards protrudes to form by the riveting portion, the explosion-proof piece periphery support in on the step portion, by the riveting portion by riveting fastening in the explosion-proof piece top of step portion upside, the explosion-proof piece quilt step portion with by the inseparable centre gripping of riveting portion.

Preferably, the step portion includes step surface and step bottom surface, the step surface periphery undercut has seted up the draw-in groove, the explosion-proof piece includes the lamellar body and certainly the card limit that the turn-ups of lamellar body outer fringe formed, the card limit card is gone into in the draw-in groove.

Preferably, the sheet body is made of a metal sheet through flanging, and the thickness of the sheet body is consistent.

Preferably, the explosion-proof sheet and the substrate are made of the same metal material, preferably aluminum alloy.

Preferably, the step surface is located between the substrate upper surface and the substrate lower surface in the vertical direction, and the thickness of the riveted portion is greater than the distance between the sheet upper surface and the substrate upper surface.

Preferably, when the substrate is formed by stamping, the stepped portion of the explosion-proof hole is formed by stamping, and the riveted portion is formed by upward flowing of metal and protruding from the upper surface of the substrate.

Preferably, the riveted part is crimped and riveted on the surface of the sheet body on the stepped part, and the surface of the sheet body, the riveted part and the stepped part are welded together by interference riveting of the same metal material.

Preferably, the step surface is located the draw-in groove inboard still is equipped with closed loop structure's waterproof groove, install waterproof circle in the waterproof groove, waterproof circle at least part protrusion the step surface, waterproof circle is pressed in between lamellar body and the step portion.

This application power battery apron is through set up step portion in the explosion vent of base plate to set up the convex quilt riveting portion that makes progress in step portion periphery, arrange the explosion-proof piece in again on the step portion, at last through with by riveting portion rivet down in the explosion-proof piece upside, through by riveting portion with the step portion centre gripping the explosion-proof piece need not welding process, compares in prior art, the explosion-proof piece adopt the sheetmetal can, need not to carry out the thickness of punching press thin lamellar body department once more, has reduced the manufacturing cost of explosion-proof piece, and has solved the problem that the welding has the gas leakage uncertainty.

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 perspective view of a power battery cover plate of the present application;

fig. 2 is an exploded sectional view of a power battery cover plate according to the first embodiment;

FIG. 3 is a cross-sectional view of the cover plate of the power battery according to the first embodiment taken along the line A-A shown in FIG. 1;

FIG. 4 is a cross-sectional view of the cover plate of the power battery according to the second embodiment along the line A-A shown in FIG. 1;

fig. 5 and 6 are diagrams illustrating steps of pressing the explosion-proof sheet on the power battery cover plate according to the present application.

Description of the reference numerals

A substrate-10; a substrate-11; a post hole-12; explosion-proof hole-13; a through-hole-131; a step-132; step floor-1321; step surface-1322; a card slot-1323; a waterproof slot-1324; a riveted part-134; explosion-proof sheet-20; sheet-21; a clamping edge-22; score-23; a waterproof ring-30; a lower support-40; a lower support end-41; an upper die-50; a pressing sleeve-51; a sheath body-511; mesopore-512; a crimp terminal-513; an inner groove-514; an upper support-52; an upper support end-521; a stopper end-522; a spring-53.

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 a few embodiments of the present application, and not all embodiments.

In the present application, the X direction shown in fig. 1 is taken as a longitudinal direction, the Y direction is taken as a transverse direction, and the Z direction is taken as a vertical direction.

As shown in fig. 1, the cover plate of the power battery of the present application includes a base plate 10 having an explosion-proof hole 13 and an explosion-proof plate 20 pressed in the explosion-proof hole 13.

Example one

With reference to fig. 2 and 3, and with particular emphasis on fig. 2, the substrate 10 of the present embodiment includes a plate-shaped base 11, at least one pair of stud holes 12 formed on the base 11, and the explosion-proof hole 13 formed through the base 11.

The explosion-proof hole 13 includes a through hole 131, a stepped portion 132 formed on the outer periphery of the through hole 131, and a caulked portion 134 crimped to the upper side of the stepped portion 132. The part to be caulked 134 projects upward from the surface of the base 11 before caulking, and the part to be caulked 134 projects upward from the outer periphery of the step portion 132. The substrate 10 is manufactured by a stamping and drawing process, the explosion-proof hole 13 is pressed downwards to form a hole, and the excess metal flows upwards on the periphery of the step portion 132 of the explosion-proof hole 13 to form a riveted portion 134.

The step portion 132 includes a step bottom surface 1321, a step surface 1322, a waterproof groove 1324 provided on the step surface 1322, and a clip groove 1323 located outside the waterproof groove 1324. The waterproof slot 1324 is in an annular closed structure. The clamping groove 1323 is located on the periphery of the waterproof groove 1324 and attached to the inner side surface of the riveted part 134, the clamping groove 1323 is preferably of a closed structure, and in specific implementation, the clamping groove 1323 can also adopt a discontinuous breakpoint scheme.

The step bottom surface 1321 is lower than the lower surface of the base body 11, and the step bottom surface 1321 is formed by metal flow when the step portion 132 is press-formed. The step surface 1322 is higher than the lower surface of the substrate 11 and lower than the upper surface of the substrate 11. The inner diameter of the through hole 131 at the position of the step part 132 is smaller than the inner diameter of the through hole 131 at the position of the riveted part 134.

The explosion-proof sheet 20 comprises a sheet body 21, a clamping edge 22 formed by flanging the periphery of the sheet body 21, and a notch 23 formed on the sheet body 21.

Referring to fig. 3, the power battery cover plate of the present application further includes a waterproof ring 30, and specifically, the waterproof ring 30 is placed in a waterproof groove 1324 on the step surface 1322 of the step part 132. After the waterproof ring 30 is placed in the waterproof slot 1324, the waterproof ring 30 is at least partially exposed above the step surface 1322. The explosion-proof plate 20 is downwardly mounted on the step portion 132, specifically, the clamping edge 22 is clamped in the clamping groove 1323 at the periphery of the step portion 132, and the peripheral portion of the plate body 21 is supported on the step surface 1322. The flashing 30 is positioned between the sheet body 21 and the step surface 1322, and then the riveted portion 134 is pressed down and riveted to the upper side of the sheet body 21 to fix the rupture disk 20 between the riveted portion 134 and the step portion 132. After the riveted part 134 is riveted, the top surface of the riveted part 134 is flush with the upper surface of the base 11. The scores 23 of the explosion-proof sheet 20 are provided on the sheet body 21 exposed in the through hole 131, and the scores 23 may be formed by pressing together when the riveted part 134 is riveted, or the scores 23 may be formed by laser or pressing after the riveted part 134 is riveted.

Preferably, the explosion-proof sheet 20 is made of the same metal material as the substrate 10, and when the riveted part 134 is crimped, the crimping manner is interference crimping, that is, the thickness of the riveted part 134 is reduced by a part after final crimping. In this way, the explosion-proof sheet 20 and the surface portion of the substrate 10 are partially fused together by the pressure bonding force to achieve sealing, and the waterproof ring 30 is tightly pressed to achieve double sealing. The explosion-proof piece 20 and the substrate 10 are preferably made of aluminum alloy, the contraction coefficients of the explosion-proof piece 20 and the substrate 10 made of the same material are consistent, and the explosion-proof piece 20 and the substrate do not generate the problem of air leakage caused by the difference of the contraction coefficients in cold-heat conversion. Of course, this application does not exclude the use of other metals than aluminium alloys.

The explosion-proof piece 20 is formed by directly flanging a metal sheet with the same thickness, the thickness of the sheet body 21 of the explosion-proof piece 20 is the same, the explosion-proof piece 20 does not need to be punched in the thickness direction, and compared with the traditional technology that a structure with the thick periphery and the thin middle part of the explosion-proof piece 20 needs to be added with a punching process, the manufacturing difficulty of a product is reduced, and the manufacturing process is simplified.

Example two

Please refer to fig. 4, the first embodiment is different from the first embodiment in that the waterproof ring 30 and the waterproof slot 1324 are not provided, and the step bottom surface 1321 of the step portion 132 is flush with the lower surface of the base 11. Other structures are consistent with the embodiment, and the crimping process is also consistent.

EXAMPLE III

With continuing reference to fig. 5 and fig. 6, the riveting method of the explosion-proof plate 20 of the cover plate of the power battery of the present application will be described in detail as follows:

s10, bending the riveted part 134 obliquely toward the explosion-proof hole 13;

referring to fig. 5, in this step, the substrate 10 is first placed on a jig or a mold, and the waterproof ring 30 and the explosion-proof sheet 20 are placed on the step portion 132 of the explosion-proof hole 13 of the substrate 10;

the mold or jig includes a lower mold (not shown) supporting the substrate 10, and an upper mold 50, the lower mold having a lower support 40 at a position corresponding to the through hole 131, the lower support 40 having a lower support end 41 at a top end thereof, the lower support end being inserted into the through hole 131 and supporting a middle portion of the sheet 21. The upper die 50 includes a pressing sleeve 51 with a hollow central hole 512, an upper support member 52 limited in the central hole 512, and a spring 53 providing a supporting force to the upper support member 52. The pressing sleeve 51 comprises a sleeve body 511, the middle hole 512 formed by penetrating through the sleeve body 511, a pressing end 513 formed at the lower end of the sleeve body 511, and an inner groove 514 opened on the surface of the pressing end 513. The inner groove 514 is an inclined surface structure formed by recessing the bottom surface of the crimping end 513 toward the center of the central hole 512, and the inclined angle is preferably 45 degrees. The upper supporting member 52 includes an upper supporting end 521 entering the through hole 131 and supporting the upper surface of the sheet 21, and the spring 53 is located in the middle hole 512 and applies downward force to the upper supporting member 52, so that the upper supporting member 52 is always pressed downward on the sheet 21.

Subsequently, the upper die 50 moves downwards, the inner groove 514 of the pressing sleeve 51 presses the riveted part 134 downwards, and the riveted part 134 is forced to bend towards the upper support 52 in an inclined shape; during the pressing down process, the upper support 52 moves upward against the pressure of the spring 53, the outer diameter of the upper support 52 is equal to the inner diameter of the through hole 131, and the riveted part 134 is pressed into the inner groove 514. The key point is that the maximum inner diameter of the inner groove 514 is larger than the outer diameter of the riveted part 134, so that the top of the riveted part 134 initially contacts the inner groove 514 to limit the inward bending of the riveted part 134.

S20, riveting the bent riveted part 134 downwards on the explosion-proof sheet 20;

in this step, a mold or a jig is provided, which is different from the mold or the jig in step S10, in this step, the end surface of the crimping end 513 of the pressing sleeve 51 is not provided with the recess 513, and the end surface of the crimping end 513 is a flat surface. The remaining structure corresponds to the structure in step S10.

The end surface of the crimping end 513 presses the bent riveted part 134 downward, so that the riveted part 134 is pressed flat downward until the explosion-proof piece 20 is located on the piece body 21 on the upper side of the stepped part 132. The thickness of the riveted part 134 is slightly larger than the distance between the upper surface of the sheet body 21 and the upper surface of the base 11, and the riveted part 134 is pressed down in an interference pressure welding state, so that the surface of the sheet body 21 is welded with the step part 132 and/or the surface of the riveted part 134. The existence of the upper support 52 can limit the riveted part 134 from excessively flowing into the through hole 131, and keep the inner diameter of the riveted part 134 smooth.

S30, providing a score 23 on the sheet body 21 through the through hole 131;

in this step, the nicks 23 may be pressed at the same time when the riveted portion 134 is pressed, that is, corresponding marks may be provided at the lower support end 41 and the upper support end 521, respectively. For quality assurance, it is preferable to process the scores 23 after completing the riveted parts 134, and the scores 23 can be completed by laser ablation or punching.

This application power battery apron is through set up step portion 132 in the explosion vent 13 of base plate 10 to set up in step portion 132 periphery and make progress the convex by riveting portion 134, arrange explosion-proof piece 20 in again on step portion 132, at last through with by riveting portion 134 riveting downwards in explosion-proof piece 20 upside, through by riveting portion 134 with step portion 132 centre gripping explosion-proof piece 20 need not welding process, compares in prior art, explosion-proof piece 20 adopt the sheetmetal can, need not to carry out the thickness of punching press thin lamellar body department once more, has reduced explosion-proof piece 20's manufacturing cost, and has solved the welding and have had the uncertain problem of gas leakage.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The power battery cover plate comprises a base plate provided with an explosion-proof hole and an explosion-proof sheet fixed in the explosion-proof hole, and is characterized in that the periphery of the explosion-proof hole is provided with a step part with the surface lower than the surface of the base plate and a riveted part which is formed by upwards protruding from the periphery of the step part, the periphery of the explosion-proof sheet is supported on the step part, the riveted part is riveted and fastened above the explosion-proof sheet on the upper side of the step part, and the explosion-proof sheet is tightly clamped by the step part and the riveted part.

2. The cover plate for the power battery as claimed in claim 1, wherein the step portion comprises a step surface and a step bottom surface, the step surface is recessed downwards at the outer periphery thereof to form a clamping groove, the explosion-proof sheet comprises a sheet body and a clamping edge formed by flanging the outer edge of the sheet body, and the clamping edge is clamped in the clamping groove.

3. The power battery cover plate according to claim 2, wherein the sheet body is made of a metal thin sheet through flanging, and the thickness of the sheet body is consistent.

4. The cover plate for power battery of claim 2, wherein the explosion-proof sheet and the base plate are made of the same metal material.

5. The power battery cover plate of claim 2, wherein the step surface is vertically between the upper surface of the base plate and the lower surface of the base plate, and the thickness of the riveted portion is greater than the distance between the upper surface of the sheet body and the upper surface of the base plate.

6. The cover plate for the power battery according to claim 5, wherein the base plate is formed by punching, and the riveted part is formed by protruding the upper surface of the base plate through upward flowing of metal.

7. The cover plate for the power battery according to claim 6, wherein the riveted part is crimped and riveted on the surface of the sheet body on the stepped part, and the surface of the sheet body, the riveted part and the stepped part are welded together by interference riveting of the same metal material.

8. The cover plate for power battery as claimed in claim 7, wherein the step surface is further provided with a waterproof groove of a closed loop structure inside the slot, a waterproof ring is installed in the waterproof groove, the waterproof ring at least partially protrudes from the step surface, and the waterproof ring is crimped between the sheet body and the step part.