CN219144298U - Top cover of power battery - Google Patents

Abstract

The utility model relates to the technical field of energy storage instruments, and provides a power battery top cover. The power battery top cap includes the top cap piece and locates first utmost point post unit and the second utmost point post unit on the top cap piece, and the top cap piece includes first mounting hole. The first pole unit comprises a first pole fixed in the first mounting hole and a first connecting piece connected with the first pole. The first connecting piece is located below the top cover piece, and a first lower insulating assembly is arranged below the top cover piece. The first lower insulating assembly comprises a first lower insulating piece and a second lower insulating piece clamped with the first lower insulating piece. One of the first lower insulating piece and the second lower insulating piece is provided with a clamping groove, and the other is provided with a clamping piece which is matched with the clamping groove in a clamping way. The first lower insulating member is interposed between the cover sheet and the first connecting member, and the first lower insulating member and the second lower insulating member enclose to form a cavity. The first connecting piece at least comprises a first connecting part fixedly connected to the first pole, and the first connecting part is all accommodated in the cavity.

Description

Top cover of power battery

Technical Field

The utility model relates to the technical field of energy storage instruments, in particular to a top cover of a power battery.

Background

The power battery is used as a power source for providing power, and is a lithium ion battery for providing power for tools such as electric automobiles, electric trains, electric bicycles, golf carts and the like. The power cells typically include a cell, a housing that contains the cell and electrolyte, and a top cover that seals the housing. The square battery is better in arrangement, so that the square battery is touted in the industry.

Square cells are typically constructed in two ways. The first electrode and the negative electrode of the battery cell accommodated in the shell extend out from the same side, and are respectively welded and connected with the positive electrode post and the negative electrode post on the top cover by virtue of the connecting sheet. The extending directions of the positive electrode and the negative electrode are the same as the extending directions of the positive electrode post and the negative electrode post on the top cover, namely, the positive electrode and the negative electrode are all extended from the upper part.

The positive electrode and the negative electrode of the battery core extend from different sides, the extending direction of the positive electrode is perpendicular to the extending direction of the positive electrode post and the negative electrode post, and the positive electrode post and the negative electrode post are respectively connected by the positive electrode connecting sheet and the negative electrode connecting sheet which are positioned on the different sides. The connecting piece of this structure generally comprises a first portion for connecting the terminal and a second portion for connecting the cell, the first and second portions being vertically distributed. In order to avoid direct electrical connection between the first portion and the top cover sheet, a lower insulating member is usually disposed under the top cover sheet, but most of the current lower insulating members only ensure insulation of the side of the first portion facing the top cover sheet or the side wall, and are difficult to insulate against the side facing away from the top cover sheet. There is thus an internal short circuit caused by the electrical contact between the side of the first part facing away from the top cover sheet and the cells during use of the battery.

Disclosure of Invention

Based on the above-mentioned problems, an object of the present utility model is to provide a power battery top cover, which can effectively maintain a long-term insulation effect to reduce the risk of internal short circuit.

In order to achieve the above object, according to a first aspect of the present utility model, there is provided a top cover of a power battery, including a top cover sheet, and a first post unit and a second post unit disposed on the top cover sheet, wherein the top cover sheet includes a first mounting hole, the first post unit includes a first post fixed in the first mounting hole and a first connecting member connected to the first post, the first connecting member is located below the top cover sheet, a first lower insulating assembly is disposed below the top cover sheet, the first lower insulating assembly includes a first lower insulating member and a second lower insulating member clamped to the first lower insulating member, one of the first lower insulating member and the second lower insulating member is provided with a clamping groove, the other one is provided with a clamping member clamped to the clamping groove, the first lower insulating member is interposed between the top cover sheet and the first connecting member, the first lower insulating member and the second lower insulating member are combined to form a cavity, and the first connecting member includes at least a first connecting portion fixedly connected to the first post, and the first connecting portion is disposed in the cavity.

As an embodiment, the first lower insulator includes a first portion, a second portion, and a third portion interposed between the first portion and the second portion, the first portion being located below the first pole unit, and the second portion being located below the second pole unit.

As an implementation mode, the side wall of the first part is outwards protruded to form the clamping piece, and the second lower insulating piece is provided with a clamping groove matched with the clamping piece in a clamping mode.

As an embodiment, the second lower insulating member includes a flat plate portion and protruding portions extending in a direction of the top cover sheet at opposite sides of the flat plate portion, and the clamping grooves are formed in the protruding portions.

As an implementation manner, the first portion is provided with a through hole in the vertical direction, the through hole forms the clamping groove, and the second lower insulating piece is provided with a clamping piece matched with the clamping groove in a clamping manner.

As an embodiment, the second lower insulating member includes a flat plate portion and a protruding block extending from the flat plate portion in a direction of the top cover sheet, and the protruding block forms the clamping member and is clamped in the clamping groove.

As an implementation scheme, the second lower insulating piece is provided with a plurality of groups of protruding blocks along the length direction of the top cover piece, and the plurality of groups of protruding blocks are symmetrically arranged above the flat plate part.

As an implementation scheme, the convex blocks are hooks, and hook openings on each group of convex blocks are opposite or opposite.

As an embodiment, the first connecting member includes a second connecting portion formed by extending convexly from one end of the first connecting portion in a direction away from the top cover sheet.

As an implementation manner, the top cover sheet comprises a second mounting hole, the second pole unit comprises a second pole fixed in the second mounting hole and a second connecting piece connected with the second pole, the second connecting piece is located below the top cover sheet, a second lower insulation component is arranged below the top cover sheet, the second lower insulation component comprises a first lower insulation piece and a third lower insulation piece clamped with the first lower insulation piece, one of the first lower insulation piece and the third lower insulation piece is provided with a clamping groove, the other one of the first lower insulation piece and the third lower insulation piece is provided with a clamping piece clamped and matched with the clamping groove, the first lower insulation piece is arranged between the top cover sheet and the second connecting piece, the first lower insulation piece and the third lower insulation piece are surrounded to form a second cavity, the second connecting piece at least comprises a third connecting portion fixedly connected with the second pole, and the third connecting portion is fully accommodated in the second cavity.

In the power battery top cover, the first lower insulating component is arranged below the top cover plate and comprises the first lower insulating component and the second lower insulating component clamped with the first lower insulating component, the first lower insulating component and the second lower insulating component are clamped and matched through the clamping groove and the clamping component, and all first connecting parts fixedly connected to the first pole in the first connecting components are contained in a cavity formed by encircling the first lower insulating component and the second lower insulating component, so that the first connecting parts can be insulated in an omnibearing manner, the first connecting parts can be prevented from being in direct electrical contact with the top cover plate and can be prevented from being in electrical contact with the battery core, and the risk of internal short circuit can be reduced.

Drawings

Fig. 1 is a top view of an embodiment of a power cell top cover of the present utility model.

Fig. 2 is a bottom view of an embodiment of the power cell top cover of the present utility model.

Fig. 3 is a perspective view of the power cell top cover of the present utility model in a first direction.

Fig. 4 is a perspective view of the power cell top cover of the present utility model in a second direction.

Fig. 5 is an exploded view of the power cell top cover of the present utility model in a first orientation.

Fig. 6 is an exploded view of the power cell top cover of the present utility model in a second direction.

Fig. 7 is an enlarged view of the circled portion of fig. 4.

Fig. 8 is a perspective view of a first embodiment of a first lower insulator of the power cell top cover of the present utility model.

Fig. 9 is a perspective view of a first embodiment of a second lower insulator of the power cell top cover of the present utility model.

Fig. 10 is a perspective view of a second embodiment of a first lower insulator of the power cell top cover of the present utility model.

Fig. 11 is a perspective view of a second embodiment of a second lower insulator of the power cell top cover of the present utility model.

Fig. 12 is a perspective view of a third embodiment of a first lower insulator of the power cell top cover of the present utility model.

Fig. 13 is a perspective view of a third embodiment of a second lower insulator of the power cell top cover of the present utility model.

DESCRIPTION OF SYMBOLS IN THE DRAWINGS

100-power battery top cap; 10-a top cover sheet; 11-a first mounting hole; 13-a second mounting hole; 15-explosion-proof valve mounting holes; 20-a first pole unit; 21-a first pole; 23-a first seal; 25-a first upper insulator; 27-a first riveting block; 30-a second pole unit; 31-second pole; 33-a second seal; 35-a second upper insulator; 37-a second rivet block; 40-filling holes; 50-explosion-proof valve assembly; 51-explosion-proof valve; 53-explosion-proof valve protection sheet; 60-a first lower insulation assembly; 60' -a second lower insulation assembly; 61-a first lower insulator; 611-first portion; 6111-a clip; 6113-hole penetrating; 6115-a clamping groove; 613-third section; 615-a second portion; 63-a second lower insulator; 631-a flat plate portion; 633-protrusions; 6331-card slot; 635-bump; 65-a third lower insulator; 70-a first connector; 71-a first connection; 73-a second connection; 80-a second connector; 81-a third connection; 83-fourth connection; s1, a cavity;

Detailed Description

In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, in general, the power battery is placed vertically, and one side of the pole piece of the power battery top cover, which extends out and is connected with the outside, is the upper side, i.e. the top direction, and the other side is the lower side, i.e. the bottom direction.

The power battery top cover and the power battery thereof according to the present utility model are described below with reference to the accompanying drawings.

The power cell typically includes a battery cell, a housing that houses the battery cell, and a power cell top cover that seals the housing. The power battery top cover can be welded with the shell to be sealed, and the shell is filled with power battery electrolyte which infiltrates the battery core. As shown in fig. 1 to 6, the power battery top cover 100 includes a top cover sheet 10 and first and second pole units 20 and 30 provided on the cover sheet 10. The top cover sheet 10 is provided with a first mounting hole 11, a second mounting hole 13, an explosion-proof valve mounting hole 15 and a liquid filling hole 40, respectively. The first and second pole units 20 and 30 are mounted to the first and second mounting holes 11 and 13, respectively. An explosion-proof valve 51 is arranged on the explosion-proof valve mounting hole 15 in a sealing manner, and an explosion-proof valve protection sheet 53 is arranged above the explosion-proof valve 51. The first pole unit 20 and the second pole unit 30 may be identical or different, and both may be electrically insulated from the top cover sheet 10, or one of the poles may be electrically connected to the top cover sheet 10, and the other pole may be electrically insulated from the top cover sheet 10. The first electrode pillar unit 20 may be a positive electrode pillar or a negative electrode pillar, and the corresponding second electrode pillar unit 30 may be a negative electrode pillar or a positive electrode pillar.

The power cell top cover 100 of the present utility model is particularly suitable for use in cell structures where the poles of the cells are perpendicular to the poles. As further shown in fig. 1 to 6, the first pole unit 20 includes a first pole 21, a first seal 23, a first upper insulator 25, a first rivet block 27, and a first connection 70. The first pole 21 penetrates through the first mounting hole 11 and is fixedly connected with the first connecting piece 70, the first sealing piece 23 surrounds the first pole 21 and seals and fixes the first pole 21 in the first mounting hole 11, the upper portion of the first pole 21 is riveted and fixed with the first riveting block 27, and the first upper insulating piece 25 is located above the top cover plate 10 and surrounds and insulates the peripheral wall of the first pole 21. The first connecting piece 70 is located below the top cover 10 and includes a first connecting portion 71 and a second connecting portion 73, the first connecting portion 71 is fixedly connected to the first pole 21, one end of the first connecting portion 71 is convexly provided with the second connecting portion 73 formed by extending along a direction away from the top cover 10, and the first connecting portion 71 and the second connecting portion 73 are in a vertical relationship. The material of the first sealing member 23 is an elastic material, such as rubber. The material of the first upper insulator 25 is plastic, and if it is required to electrically connect the first pole unit 20 and the top cover sheet 10, conductive particles may be injected when preparing the first upper insulator 25. The second post unit 30 includes a second post 31, a second sealing member 33, a second upper insulating member 35, a second rivet block 37, and a second connecting member 80. The second post 31 penetrates through the second mounting hole 13 and is fixedly connected with the second connecting piece 80, the second sealing piece 33 encloses the second post 31 and seals and fixes the second post 31 in the second mounting hole 13, the upper portion of the second post 31 is riveted and fixed with the second riveting block 37, and the second upper insulating piece 35 is located above the top cover plate 10 and encloses and insulates the peripheral wall of the second post 31. The second connecting member 80 includes a third connecting portion 81 and a fourth connecting portion 83, the third connecting portion 81 is fixedly connected to the second post 31, one end of the third connecting portion 81 is convexly provided with the fourth connecting portion 83 formed by extending along a direction away from the top cover sheet 10, and the third connecting portion 81 and the fourth connecting portion 83 are in a vertical relationship. The material of the second sealing member 33 is an elastic material, such as rubber. The second upper insulator 35 is made of plastic.

As shown in fig. 3 to 13, a first lower insulating member 60 is provided below the cover sheet 10, and the first lower insulating member 60 includes a first lower insulating member 61 and a second lower insulating member 63 engaged with the first lower insulating member 61. The first lower insulator 61 is interposed between the cover sheet 10 and the first connector 70, and the first lower insulator 61 and the second lower insulator 63 enclose a cavity S1. The first connection portion 71 is all accommodated in the cavity S1, so that the first connection portion 71 can be insulated in all directions, and the first connection portion 71 can be prevented from being in direct electrical contact with the top cover sheet 10 and also from being in electrical contact with the battery cell, so that the risk of internal short circuit can be reduced.

As an embodiment, the first lower insulator 61 includes a first portion 611, a second portion 615, and a third portion 613 interposed between the first portion 611 and the second portion 615. The first portion 611 is located below the first pole unit 20, and the second portion 615 is located below the second pole unit 30. One of the first lower insulating member 61 and the second lower insulating member 63 is provided with a clamping groove, and the other is provided with a clamping member which is matched with the clamping groove in a clamping way.

Specifically, as shown in fig. 8 to 9, the side wall of the first portion 611 is outwardly protruded to form a clip 6111, and the second lower insulating member 63 includes a flat plate portion 631 and a protrusion 633 extending in the direction of the top cover sheet 10 on opposite sides of the flat plate portion 631. The convex part 633 is provided with a clamping groove 6331.

As another embodiment, as shown in fig. 10 to 13, the first portion 611 may be provided with a through hole in a vertical direction, and the through hole forms a clamping groove 6115. The flat plate portion 631 of the second lower insulating member 63 extends toward the top cover sheet 10 to form a protruding block 635, and the protruding block 635 forms a locking member and is locked in the locking groove 6115. The protruding blocks 635 are provided with a plurality of groups of protruding blocks 635 along the length direction of the top cover sheet 10, and the plurality of groups of protruding blocks 635 are symmetrically arranged above the flat plate portion 631. The protrusions 635 are hooks, and the openings of the hooks on each set of protrusions 635 are opposite (as shown in fig. 11) or opposite (as shown in fig. 13).

Similarly, the top cover sheet 10 is provided with a second lower insulating member 60' at one side of the second post unit 30. The second lower insulating assembly 60' includes a first lower insulating member 61 and a third lower insulating member 65 engaged with the first lower insulating member 61. In order to facilitate the molding process, the first lower insulator 61 extends from the first pole unit 20 up to the second pole unit 30, i.e., the first lower insulator 61 is located on the entire lower surface of the cover sheet 10. The first lower insulator 61 and the third lower insulator 65 enclose a second cavity. The third connection portion 81 of the second connection member 80 is entirely accommodated in the second cavity. The third connection part 81 can be insulated in all directions, and the third connection part 81 can be prevented from being in direct electrical contact with the top cover sheet 10 and also from being in electrical contact with the battery cell, so that the risk of internal short circuit can be reduced. Of course, the first lower insulator 61 is not limited to the above-described integrated structure, and may be a separate structure in actual operation. I.e., the first lower insulator 61 located under the first pole unit 20 and the first lower insulator 61 located under the second pole unit 30 are separate and apart structures. The third lower insulating member 65 may have a similar structure to the second lower insulating member 63, and will not be described herein.

The above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the scope of the present utility model, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present utility model may be modified or substituted without departing from the spirit and scope of the technical solution of the present utility model.

Claims (10)

1. The utility model provides a power battery top cap (100), includes top cap piece (10) and locates first utmost point post unit (20) and second utmost point post unit (30) on top cap piece (10), top cap piece (10) include first mounting hole (11), first utmost point post unit (20) are including being fixed in first utmost point post (21) of first mounting hole (11) and connection first connecting piece (70) of first utmost point post (21), first connecting piece (70) are located the below of top cap piece (10), the below of top cap piece (10) is equipped with first insulating subassembly (60) down, first insulating subassembly (60) include first insulating part (61) and with second insulating part (63) of first insulating part (61) joint down, one of first insulating part (61) and second insulating part (63) down be equipped with the draw-in groove, another be equipped with draw-in groove joint cooperation, first insulating part (61) are located the below top cap piece (10) and first insulating part (70) are connected down in first insulating part (70) are formed in the top cap piece (1) and are connected down in the first insulating part (70), the first connecting portions (71) are all accommodated in the cavity (S1).

2. The power cell top cover (100) of claim 1, wherein the first lower insulator (61) comprises a first portion (611), a second portion (615), and a third portion (613) interposed between the first portion (611) and the second portion (615), the first portion (611) being located below the first pole unit (20), the second portion (615) being located below the second pole unit (30).

3. The power battery top cover (100) according to claim 2, wherein the side wall of the first portion (611) is outwardly protruded to form the clamping piece (6111), and the second lower insulating piece (63) is provided with a clamping groove (6331) in clamping fit with the clamping piece (6111).

4. The power battery top cover (100) according to claim 3, wherein the second lower insulating member (63) comprises a flat plate portion (631) and protruding portions (633) extending in a direction of the top cover sheet (10) on opposite sides of the flat plate portion (631), and the clamping groove (6331) is provided on the protruding portions (633).

5. The power battery top cover (100) according to claim 2, wherein the first portion (611) is provided with a through hole in a vertical direction, the through hole forms the clamping groove (6115), and the second lower insulating member (63) is provided with a clamping member in clamping fit with the clamping groove (6115).

6. The power battery top cover (100) according to claim 5, wherein the second lower insulating member (63) includes a flat plate portion (631) and a projection (635) extending from the flat plate portion (631) in the direction of the top cover sheet (10), and the projection (635) constitutes the engaging member and is engaged with the engaging groove (6115).

7. The power battery top cover (100) according to claim 6, wherein the second lower insulating member (63) is provided with a plurality of sets of bumps (635) along the length direction of the top cover sheet (10), and the plurality of sets of bumps (635) are symmetrically arranged above the flat plate portion (631).

8. The power cell top cover (100) of claim 7, wherein the protrusions (635) are hooks, and the hook openings on each set of protrusions (635) are disposed opposite or opposite.

9. The power cell top cover (100) according to claim 1, wherein the first connection member (70) includes a second connection portion (73) formed by extending convexly from one end of the first connection portion (71) in a direction away from the top cover sheet (10).

10. The power battery top cover (100) according to claim 1, wherein the top cover sheet (10) comprises a second mounting hole (13), the second pole unit (30) comprises a second pole (31) fixed in the second mounting hole (13) and a second connecting piece (80) connected with the second pole (31), the second connecting piece (80) is located below the top cover sheet (10), a second lower insulating component (60 ') is arranged below the top cover sheet (10), the second lower insulating component (60') comprises a first lower insulating piece (61) and a third lower insulating piece (65) clamped with the first lower insulating piece (61), one of the first lower insulating piece (61) and the third lower insulating piece (65) is provided with a clamping groove, the other is provided with a clamping piece matched with the clamping groove in a clamping way, the first lower insulating piece (61) is arranged between the top cover sheet (10) and the second connecting piece (80), the second lower insulating piece (61) is connected with the second lower insulating piece (65), and the second lower insulating piece (61) forms at least a second cavity (81) and the third connecting piece (81) is connected with the second lower insulating piece (65).

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