CN218887342U

CN218887342U - Power battery top cap assembly subassembly, power battery top cap and power battery

Info

Publication number: CN218887342U
Application number: CN202222622262.4U
Authority: CN
Inventors: 邓平华; 王雷; 王世杰
Original assignee: Jiangxi Baisili New Energy Technology Co ltd
Current assignee: Jiangxi Baisili New Energy Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-04-18
Anticipated expiration: 2032-09-30

Abstract

The utility model provides a power battery top cap assembly subassembly, power battery top cap and power battery. The power battery top cover assembly comprises a top cover plate and a plastic insulating part located below the top cover plate. The lower part of the top cover plate is convexly provided with a plurality of columns, each column comprises a first part and a second part which are connected, the first part is arranged between the top cover plate and the second part, and the outer perimeter of the orthographic projection of the second part on the top cover plate is larger than the outer perimeter of the orthographic projection of the first part on the top cover plate. The plastic insulating part is provided with a plurality of connecting holes corresponding to the column body, the column body is clamped in the connecting holes, the first part is embedded in the connecting holes, and at least part of the second part is convexly arranged in the connecting holes. The lower part of the plastic insulating part is provided with a bulge around the connecting hole, and the height of the bulge is larger than or equal to the size of the second part which is convexly arranged in the connecting hole. The cylinder with higher hardness is clamped in the plastic insulating part, and the part with larger size of the cylinder is clamped below the connecting hole, so that the connecting mode is firm, and the insulating effect can be maintained even if the connecting mode is used for a long time.

Description

Power battery top cover assembly, power battery top cover and power battery

Technical Field

The utility model relates to an energy storage apparatus technical field especially relates to a power battery top cap assembly subassembly, power battery top cap and power battery.

Background

The power battery generally includes a battery cell, a housing for accommodating the battery cell, and a top cover for sealing the housing, and the top cover is provided with a top cover plate, a positive pole unit, and a negative pole unit. In order to prevent the cell from contacting the top cover, an insulator is usually disposed between the top cover and the cell.

The industry has the support of using the lock to keep apart electric core and casing and top cap piece, and electric core is wrapped up in the support cavity of lock, and just, the negative pole ear is stretched out by the upper end of support, but the extravagant more space of this kind of structure is unfavorable for improving power battery's volume energy density.

Also there is the researcher to set up the insulation board with the below of top cap piece and keep apart electric core and top cap piece, and the insulation board can be fixed in the injection molding on the top cap piece for the hot melt, but injection molding process is more complicated, and receives external force or high temperature's influence and warp in the follow-up use easily, influences its insulating effect.

In addition, researchers also propose that an insulating plate and a top cover plate which are positioned below the top cover plate are clamped, one side of the insulating plate is provided with a connecting hole, the other side of the insulating plate is correspondingly provided with a protruding part, and the protruding part is clamped in the connecting hole to realize clamping connection of the insulating plate and the top cover plate. However, the current clamping manner is not firm, and cannot meet the long-term requirement of the power battery. Simultaneously, form the bulge when the top cap piece, form the connecting hole on the injection molding, the bulge is worn out the connecting hole easily and is contacted electric core when the operation is improper, causes insulating inefficacy.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model aims at providing a power battery top cap assembly spare, power battery top cap and power battery, during this power battery top cap assembly spare top cap piece and plastic insulating part connect firm and can effectively maintain long-term insulating effect.

In order to realize the above object, the utility model provides a power battery top cap assembly spare is provided in the first aspect, include the top cap piece and be located the plastic insulating part of top cap piece below, a plurality of cylinders are established to the protruding below of top cap piece, the cylinder is including continuous first portion and second portion, first portion in the top cap piece with between the second portion, the second portion in orthographic outer length on the top cap piece is greater than first portion in orthographic outer length on the top cap piece, the plastic insulating part be equipped with a plurality of with the connecting hole that the cylinder corresponds, the cylinder joint in the connecting hole, just first portion is embedded in the connecting hole, at least part the protruding locating of second portion the connecting hole, the below of plastic insulating part centers on the connecting hole is equipped with the arch, bellied high more than or equal to the protruding locating of second portion the size of connecting hole.

As an embodiment, the first portion has a cylindrical structure, and at least a part of an outer wall of the second portion has a curved surface.

In one embodiment, the second portion is recessed to form a first groove on a side away from the top cover sheet.

As an embodiment, the inner wall of the connecting hole is provided with a plurality of notches.

As an embodiment, the protrusion is an annular sidewall formed by extending the plastic insulating member below.

In one embodiment, the plastic insulator extends to form the protrusion, the protrusion is connected to the isolation plate, and the isolation plate is suspended below the second portion.

As an embodiment, the protrusion is connected to the isolation plate, the isolation plate is suspended below the second portion, and the protrusion is clamped in the notch.

As an embodiment, the upper surface of the top cover sheet is concave to form a second groove corresponding to the column body.

The utility model discloses the second aspect provides a power battery top cap, include aforementioned power battery top cap assembly spare, locate anodal post unit on the top cap piece with locate negative pole post unit on the top cap piece.

The utility model discloses the third aspect provides including electric core, holding the casing of electric core and sealed the aforementioned power battery top cap of casing.

The utility model discloses among the power battery top cap assembly spare, the second portion is greater than the first portion on the top cap piece orthographic projection's outer perimeter on the top cap piece, and the cylinder is big structure about big promptly. The cylinder joint is in the connecting hole, and the embedded connecting hole in first portion, and the connecting hole is located to at least partial second portion arch, through with the higher cylinder joint of hardness in plastic insulating part, and the great part joint of cylinder size in the below of connecting hole, this kind of connected mode is firm, even long-term use also can maintain insulating effect. Through setting up the arch, and the protruding size of locating the connecting hole of bellied high more than or equal to second portion, so can separate the pole piece of cylinder and electric core, can not lead to insulation failure because of the pole piece contact of cylinder and electric core.

Drawings

Fig. 1 is a top view of a first embodiment of the top cover of the power battery of the present invention.

Fig. 2 is a bottom view of the first embodiment of the top cover of the power battery of the present invention.

Fig. 3 is an exploded view of the first embodiment of the top cover of the power battery according to the present invention in the first direction.

Fig. 4 is an exploded view of the first embodiment of the top cover of the power battery according to the present invention in the second direction.

Fig. 5 is an exploded view of the first embodiment of the power battery top cover assembly of the present invention in a first direction.

FIG. 6 isbase:Sub>A cross-sectional view of the power cell top cover of FIG. 1 in the direction A-A.

Fig. 7 is an enlarged view of a portion indicated by B in fig. 3.

Fig. 8 is an enlarged view of a portion indicated by C in fig. 4.

Fig. 9 is an enlarged view of a portion indicated by D in fig. 4.

Fig. 10 is an enlarged view of a portion indicated by E in fig. 6.

Fig. 11 is a variation of fig. 10.

Fig. 12 is an exploded view of a second embodiment of a top cap of a power battery according to the present invention in a first direction.

Fig. 13 is an exploded view of a second embodiment of the top cover of the power battery according to the present invention in a second direction.

Fig. 14 is a variation of fig. 6.

Fig. 15 is an enlarged view indicated by H in fig. 14.

Fig. 16 is an enlarged view of a portion indicated by F in fig. 12.

Fig. 17 is an enlarged view of a portion indicated by G in fig. 13.

Fig. 18 is an exploded view of a third embodiment of a top cover of a power battery according to the present invention in a first direction.

Fig. 19 is an exploded view of the third embodiment of the top cover of the power battery of the present invention in the second direction.

Fig. 20 is another variation of fig. 6.

Fig. 21 is an enlarged view indicated by J in fig. 20.

Fig. 22 is an enlarged view of a portion indicated by I in fig. 19.

DESCRIPTION OF SYMBOLS IN THE DRAWINGS

100-power battery top cover; 10-a power battery top cover assembly; 11-a top cover sheet; 111-a second groove; 113-positive mounting holes; 115-negative mounting holes; 117-explosion proof valve mounting hole; 119-column; 1191-first section; 1193-second section; 1195-first groove; 13-plastic insulation; 131-a connection hole; 1311-notch; 133-projection; 135-body; 137-bumps; 139-a separator plate; 30-positive pole unit; 50-negative pole column unit; 70-liquid injection hole; 90-explosion-proof valve

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention 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, the power battery is usually placed vertically, one side of the pole piece of the top cover of the power battery, 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 of the present invention are explained with reference to the accompanying drawings.

A power battery generally includes a battery cell, a casing for accommodating the battery cell, and a power battery top cover for sealing the casing. The top cover of the power battery can be welded with the shell for sealing, and power battery electrolyte for infiltrating the battery core is injected into the shell. As shown in fig. 1 to 5, 12 to 14, and 18 to 20, the power battery top cover 200 includes a power battery top cover assembly 10, and a positive pole unit 30 and a negative pole unit 50 provided on the power battery top cover assembly 10. The power battery top cover assembly 10 includes a top cover sheet 11 and a plastic insulator 13 located below the top cover sheet 11. The top cover plate 11 is provided with an explosion-proof valve mounting hole 117, a liquid injection hole 70, a positive pole mounting hole 113 and a negative pole mounting hole 115 respectively, and the positive pole unit 30 and the negative pole unit 50 are mounted in the positive pole mounting hole 113 and the negative pole mounting hole 115 respectively. The explosion-proof valve 90 is hermetically arranged on the explosion-proof valve mounting hole 117. The positive post unit 30 and the negative post unit 50 may be the same or different, both may be electrically insulated from the top cover sheet 11, or the negative post unit 50 may be electrically insulated from the top cover sheet 11, and the positive post unit 30 is electrically connected to the top cover sheet 11. Since the positive pole unit 30 and the negative pole unit 50 can adopt conventional pole assemblies, and are not the key points of the present invention, they are not described herein.

As shown in fig. 3 to 11, a plurality of columns 119 are protruded below the top cover plate 11 in the power battery top cover assembly 10. Post 119 includes a first portion 1191 and a second portion 1193 that are connected. First portion 1191 is interposed between top cover sheet 11 and second portion 1193. The orthographic projection of the second portion 1193 on the top cover plate 11 has an outer perimeter larger than that of the first portion 1191 on the top cover plate 11, that is, the column 119 has a structure with a small top and a large bottom. The plastic insulator 13 is provided with a plurality of coupling holes 131 corresponding to the columns 119. The column 119 is clamped in the connecting hole 131, the first portion 1191 is embedded in the connecting hole 131, at least part of the second portion 1193 is convexly arranged in the connecting hole 131, a protrusion 133 is arranged below the plastic insulating piece 13 around the connecting hole 131, and the height of the protrusion 133 is larger than or equal to the size of the second portion 1193 convexly arranged in the connecting hole 131. The column 119 with high hardness is clamped in the plastic insulating part 13, and the part of the column 119 with large size is clamped below the connecting hole 131, so that the connection mode is firm, and the insulating effect can be maintained even if the column is used for a long time. Through the arrangement of the protrusion 133, and the height of the protrusion 133 is greater than or equal to the size of the protruding portion 1193 in the connection hole 131, the column 119 and the pole piece of the battery cell can be separated, and insulation failure caused by contact between the column 119 and the pole piece of the battery cell is avoided.

Illustratively, the columns 119 are plural and symmetrically distributed along the middle of the top cover sheet 11. The first portion 1191 is a cylindrical structure, at least part of the outer wall of the second portion 1193 is a curved surface, the column 119 is large at the head and small at the root, and the outline shape is similar to an inverted cone, a mushroom head, an inverted bell mouth and the like. For ease of processing, the second portion is recessed 1193 on a side away from the top cover sheet 11 to form a first recess 1195, as shown in FIG. 11. There are various ways to form the column 119 on the top cover sheet 11, such as stamping, stretching, etc., if the top cover sheet 11 is formed by stamping, the second groove 111 is formed on the top surface of the top cover sheet 11 corresponding to the concave position of the column 119.

In addition, the plastic insulator 13 should have a certain deformation capability, so the second portion 1193 with a larger size can be inserted into the connection hole 131, but the deformation capability should not be too large to avoid the connection from loosening.

The inner wall of the connection hole 131 of the plastic insulator 13 is provided with a plurality of notches 1311 to facilitate the installation of the column 119. The plastic insulator 13 includes a body 135 and a protrusion 137 formed extending along a side of the body 135 away from the top cover 11. For convenience of processing, the protrusion 137 is not usually a one-piece plate-shaped structure, and has a plurality of notches (not shown), and the connecting hole 131 can be disposed in the notches, as shown in fig. 1 to 11. The protrusion 133 is, for example, an annular sidewall formed by extending the plastic insulator 13 thereunder, and this structure is easy to process.

Or, as shown in fig. 12 to 17, the connection hole 131 is disposed on the body 135, the protrusions 133 are discontinuous and spaced from each other, the boss 133 is connected to the isolation plate 139, the isolation plate 139 is suspended below the second portion 1193, the protrusions 133 are clamped in the gap 1311, the isolation plate 139 can play an insulating and protecting role, and the protrusions 133 and the plastic insulating member 13 are split structures.

Alternatively, as shown in fig. 18 to 22, the connection hole 131 is formed on the body 135, and the protrusions 133 are discontinuous and spaced apart from each other. The plastic insulator 13 extends below to form a protrusion 133, the protrusion 133 is connected with the isolation plate 139, the isolation plate 139 is suspended below the second portion 1193, the isolation plate 139 can play an insulating and protecting role, and the protrusion 133 and the plastic insulator 13 are of an integrated structure.

The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, the present invention is not limited to the embodiments, and those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides a power battery top cap assembly spare (10), includes top cover piece (11) and is located plastic insulating part (13) of top cover piece (11) below, its characterized in that, the protruding a plurality of cylinders (119) of establishing in below of top cover piece (11), cylinder (119) are including consecutive first portion (1191) and second portion (1193), first portion (1191) is in top cover piece (11) with between second portion (1193), second portion (1193) in orthographic outer peripheral length is greater than on top cover piece (11) first portion (1191) in orthographic outer peripheral length on top cover piece (11), plastic insulating part (13) be equipped with a plurality of with connecting hole (131) that cylinder (119) correspond, cylinder (119) joint in connecting hole (131), just first portion (1191) is embedded in connecting hole (131), at least part second portion (1193) are located protruding connecting hole (131), insulating part (13) are equipped with protruding lug boss (133) around the connecting hole (133) of second portion (131), the protruding lug size is greater than the connecting hole (1193).

2. The power cell top cap assembly (10) of claim 1, wherein the first portion (1191) is a cylindrical structure and at least a portion of an outer wall of the second portion (1193) is curved.

3. The power cell top cover assembly (10) of claim 2, wherein the second portion (1193) is recessed on a side away from the top cover piece (11) to form a first recess (1195).

4. The power cell top cap assembly (10) of claim 1, wherein the inner wall of the connection hole (131) is provided with a plurality of notches (1311).

5. The power cell top cap assembly (10) of claim 1, wherein the protrusion (133) is an annular sidewall formed by the plastic insulator (13) extending thereunder.

6. The power cell top cap assembly (10) of claim 1, wherein the plastic insulator (13) extends below to form the protrusion (133), the protrusion (133) is connected to a spacer plate (139), and the spacer plate (139) is suspended below the second portion (1193).

7. The power battery top cap assembly (10) of claim 4, wherein the protrusion (133) is connected to a separator plate (139), the separator plate (139) is suspended below the second portion (1193), and the protrusion (133) is snapped into the notch (1311).

8. The power battery top cover assembly (10) of claim 1, wherein the top cover sheet (11) is recessed at its upper surface corresponding to the post (119) to form a second groove (111).

9. A power battery top cover, characterized by comprising the power battery top cover assembly component (10) of any one of claims 1 to 8, a positive pole post unit (30) arranged on the top cover plate (11), and a negative pole post unit (50) arranged on the top cover plate (11).

10. A power battery, characterized by comprising a battery cell, a casing accommodating the battery cell, and the power battery top cover (100) of claim 9 sealing the casing.