CN220290940U - Battery top cap and battery - Google Patents

Abstract

The utility model relates to the technical field of power batteries, and discloses a battery top cover and a battery, wherein a pole through hole is formed in a cover plate, and a pole assembly is fixed with the cover plate through a sealing piece and the pole through hole; the pole assembly comprises a first pole, the first pole comprises a first part, a second part and a third part, two end faces of the second part are respectively connected with end faces of the second part and the third part, an upper plastic ring is arranged around the sealing piece, the inner wall of the upper plastic ring defines a pole accommodating part, and the pole is positioned in the pole accommodating part. Under the prerequisite that does not influence the inside effective space of battery, through canceling the riveting piece, optimize utmost point post structure, because of having reduced outstanding height such as utmost point post on the apron under keeping original power battery height, can correspondingly increase electric core casing height, promote battery module high space utilization, simplify the structure simultaneously, reduce processing procedure, reduce cost.

Description

Battery top cap and battery

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery top cover and a battery.

Background

At present, new energy automobiles are developed in various countries, and power batteries are also developed rapidly, and meanwhile, requirements on the power batteries are higher and higher, especially in the aspects of safety, energy density, charging rate and the like. For the riveted top cover, the defects of complex structure, low quality, high cost and the like exist, meanwhile, the traditional riveted top cover is limited by a connecting mode, so that the thickness of a riveted block cannot be thinned, the height of a connecting part of a pole is increased, the internal space of a battery is reduced due to the increase of the height of the pole, the capacity of a battery core is reduced, and the improvement of the energy density of the battery is not facilitated. And the cross section area of the riveted polar post is smaller due to structural limitation, so that the current carrying capacity is poor, and the improvement of the quick charge rate is not facilitated.

The prior art CN209730050U discloses a power battery post subassembly, including positive pole post subassembly and negative pole post subassembly, positive pole post subassembly and negative pole post subassembly all include post terminal, snap ring and plastic of moulding plastics, and post terminal and snap ring pass through the plastic shaping of moulding plastics as an organic wholely. However, in this prior art, the post assembly is integrally formed only by injection molding plastic, and when the plastic is aged or deformed due to high temperature, the post assembly will loose, which may cause failures such as poor contact of the battery.

Disclosure of Invention

The utility model aims to provide a battery top cover and a battery, and aims to solve the problems that the traditional riveting type top cover in the prior art is limited by a connection mode, so that the thickness of a riveting block cannot be thinned, the height of a connecting part of a pole is increased, the internal space of the battery is reduced due to the increase of the height of the pole, the capacity of a battery core is reduced, and the energy density of the battery is not improved. And the cross section area of the riveted polar post is smaller due to structural limitation, so that the current carrying capacity is poor, and the technical problem of improving the quick charge rate is not facilitated.

In order to achieve the above object, a first aspect of the present utility model provides a battery top cover.

Further, a battery top cover includes a post assembly, a seal, and a cover plate; the cover plate is provided with a pole via hole, and the pole assembly is fixed with the cover plate through the sealing piece and the pole via hole; the pole assembly comprises a first pole, the first pole comprises a first part, a second part and a third part, and two end surfaces of the second part are respectively connected with the end surfaces of the first part and the third part; the pole assembly comprises an upper plastic, the upper plastic surrounds the sealing piece, a pole accommodating part is defined by the inner wall of the upper plastic, and the pole is located in the pole accommodating part.

Further, a groove is formed in one side, facing the sealing piece, of the cover plate, and the pole through hole is formed in the bottom of the groove; the sealing piece is positioned between the second part of the first pole and the groove, and is arranged around the sealing piece with the upper plastic; the pole assembly is clamped in the groove.

Further, the battery further comprises an electric connection sheet and a current collector, wherein the third part of the first polar column is electrically connected with the electric connection sheet and the current collector respectively.

Further, the pole assembly further comprises a connecting piece, a protruding portion is arranged at one end of the connecting piece, a first clamping groove is formed in the outer wall of the upper plastic, and the protruding portion is embedded into the first clamping groove through the outer wall of the upper plastic.

Further, the corner of the pole accommodating part is provided with a second clamping groove, the periphery of the second part of the first pole is protruded out of the third part, the protruded part is a skirt edge of the pole, and part of the skirt edge of the pole is embedded into the second clamping groove from the inner wall of the upper plastic.

Further, the side of going up the plastic is provided with the projection, the side of connecting piece is provided with the through-hole, the projection sets up in the through-hole.

Further, the anti-explosion device further comprises an anti-explosion valve, wherein the cover plate is provided with an explosion opening, and the anti-explosion valve is arranged at the explosion opening.

Further, the sealing device also comprises lower plastic, wherein one end of the cover plate is provided with the groove, and one side of the cover plate, which is opposite to the sealing piece, is clamped with the lower plastic; the third part is 0.05 mm-2 mm higher than the lower plastic; the first portion is 0.05 mm-2 mm above the upper plastic.

Further, the upper plastic is formed by injection molding, and is fixedly connected with the connecting piece and the pole through an injection molding process.

A second aspect of the present utility model provides a battery comprising a battery case, a bare cell and an electrolyte contained in the battery case, and a battery top cover according to any one of the above, the battery top cover being sealingly mounted on the battery case.

The beneficial effects are that:

go up the plastic and encircle the sealing member setting, go up the inner wall of plastic and define utmost point post holding portion, the utmost point post is located utmost point post holding portion, under the prerequisite that does not influence the inside effective space of battery, through canceling the riveting piece, optimize utmost point post structure, keep under original power battery height because of having reduced protruding height such as utmost point post on the apron, can correspondingly increase electric core casing height, promote battery module high space utilization, further promote monomer battery capacity, simplify the structure simultaneously, reduce apron accessory quantity, reduce processing procedure, reduce cost. In addition, because of the third part, the cross section of the sealing element is L-shaped, and the complexity of the cover plate and the sealing element structure is reduced.

Drawings

Fig. 1 is a schematic view of an installed state of a battery according to an embodiment of the present utility model;

fig. 2 is a schematic view showing an exploded state of a battery according to an embodiment of the present utility model;

FIG. 3 is a top view of a battery according to an embodiment of the utility model;

FIG. 4 is a schematic cross-sectional view of A A of FIG. 3 in accordance with an embodiment of the utility model;

FIG. 5 is an enlarged partial view of the portion I shown in FIG. 4 in accordance with one embodiment of the present utility model;

FIG. 6 is an exploded view of a header assembly according to one embodiment of the present utility model;

FIG. 7 is a schematic view of the pole of FIG. 4 in accordance with an embodiment of the present utility model;

FIG. 8 is a schematic illustration of the upper plastic of FIG. 4 in accordance with one embodiment of the present utility model;

FIG. 9 is a schematic view of the connector of FIG. 4 according to an embodiment of the present utility model.

Wherein:

1 a top cover structure; 2, an electric connecting sheet; 3-a pole piece assembly; 4-a battery case; a 10-pole assembly; 11-pole; 12-plastic feeding; 13-a connector; 20-a seal; 30-cover plate; 40-lower plastic; 50-explosion-proof valve; 31-current collector; 111-a first part; 112-a second portion; 113-a third part; 114-skirt; 121-a first card slot; 122-a second card slot; 123-convex column, 124-pole 11 accommodation part; 131-through holes; 132-a protrusion; 301 post vias; 302 a liquid injection hole; 303-a spray port; 304-grooves; 305-lower surface.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element 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 the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless specifically defined otherwise.

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; the connection may be mechanical connection, direct connection or indirect connection through an intermediate medium, and may be internal connection of two elements or interaction relationship of two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

Referring to fig. 1, 6 and 7, in one embodiment, a battery top cover includes a top cover structure 1, the top cover structure 1 including a pole assembly 10, a seal 20 and a cover plate 30; the cover plate 30 is provided with a post via 301, and the post assembly 10 is fixed with the cover plate 30 through the sealing member 20 and the post via 301; the pole assembly 10 comprises a first pole 11, wherein the first pole 11 comprises a first part 111, a second part 112 and a third part 113, and two end surfaces of the second part 112 are respectively connected with end surfaces of the first part 111 and the third part 113; the pole assembly comprises an upper plastic 12, the upper plastic 12 is arranged around the sealing piece 20, the inner wall of the upper plastic 12 defines a pole accommodating part 124, and the pole 11 is located in the pole accommodating part 124.

In the above embodiment, the upper plastic 12 is disposed around the sealing member 20, the inner wall of the upper plastic 12 defines the pole accommodating portion 124, the pole 11 is located in the pole accommodating portion 124, and the structure of the pole 11 is optimized by canceling the riveting block on the premise of not affecting the effective space inside the battery, so that the height of the battery can be correspondingly increased by reducing the protruding height of the pole 11 on the cover plate 30 under the condition of keeping the original power battery height, the space utilization of the height of the battery module is improved, the capacity of the single battery is further improved, the structure is simplified, the number of accessories of the cover plate 30 is reduced, the processing procedure is reduced, and the cost is reduced. In addition, because of the presence of the third portion 113, the seal 20 is provided with an L-shaped cross section, reducing the complexity of the construction of the cover plate 30 and the seal 20.

Referring to fig. 6 and 7, in an embodiment, a groove 304 is provided on a side of the cover plate 30 facing the sealing member 20, and the post via 301 is provided at a bottom of the groove 304; the seal 20 is located between the second portion 112 of the first pole 11 and the groove 304, and is disposed around the seal 20 with the upper plastic 12; the pole assembly 10 is clamped to the groove 304.

In the above embodiment, the pole assembly 10 is clamped to the groove 304, which increases the structural stability and mechanical strength of the pole assembly 10. The seal 20 is positioned between the second portion 112 and the groove 304 and is positioned around the seal 20 with the upper plastic 12 to increase the sealing effect of the seal 20.

Referring to fig. 2, 7 and 9, in an embodiment, the battery top cover further includes an electrical connection sheet 2 and a current collector 31, and the third portion 113 of the first electrode post 11 is electrically connected to the electrical connection sheet 2 and the current collector 31, respectively.

In the above embodiment, the third portion 113 is disposed on the pole 11, and the third portion 113 may be connected to the electrical connection piece 2, or the third portion 113 is directly connected to the current collector 31, so as to improve the current carrying capability of the pole 11 and increase the charging rate.

Referring to fig. 5, 8 and 9, in an embodiment, the pole assembly 10 further includes a connecting member 13, one end of the connecting member 13 is provided with a protrusion 132, the outer wall of the upper plastic 12 is provided with a first clamping groove 121, and the protrusion 132 is embedded into the first clamping groove 121 from the outer wall of the upper plastic 12.

In the above embodiment, the first clamping groove 121 is disposed on the outer wall of the upper plastic 12, and the outer wall of the upper plastic 12 disposed at one end of the connecting piece 13 is embedded into the first clamping groove 121, so that the connecting piece 13 is more firmly fixed on the upper plastic 12. Thereby enhancing the structural stability and mechanical strength of the pole assembly 10.

Referring to fig. 8 and 9, in an embodiment, a second clamping groove 122 is formed at a corner of the pole accommodating portion 124, the outer periphery of the second portion 112 of the first pole 11 protrudes from the third portion 113 to form a skirt 114 of the pole 11, and a part of the skirt 114 of the pole 11 is embedded into the second clamping groove 122 from an inner wall of the upper plastic 12.

In the above embodiment, the pole accommodating portion 124 is formed by disposing the upper plastic 12 around the sealing member 20, the inner wall of the upper plastic 12 is defined, the second clamping groove 122 is disposed at the corners of the pole accommodating portion 124, i.e. on the inner wall of the upper plastic 12, the second clamping grooves 122 are disposed at the four corners of the inner wall of the upper plastic 12, and the partial skirt 114 of the pole 11 is embedded into the second clamping groove 122 from the inner wall of the upper plastic 12, so as to effectively increase the area of the third portion 113, thereby increasing the space inside the battery and improving the energy density of the battery.

The pole 11 is divided into three parts, namely a second part 112, a first part 111 and a third part 113, wherein the three parts are all cylinders, the radius of the third part 113 is smaller than that of the second part 112 and smaller than that of the second part 112, two ends of the second part 112 are respectively connected with one ends of the second part 112 and the third part 113, the three parts are coaxially arranged, two sides of the second part 112 protrude out of the second part 112 and the third part 113, the side edges of the three parts are skirt edges 114 of the pole 11, and the second part 112 protrudes out of the second part 112 and the third part 113 and is embedded into the second clamping groove 122 from the inner wall of the upper plastic 12. In another embodiment, the three portions are rectangular or other shape.

The part of the skirt 114 of the pole 11 is embedded into the second clamping groove 122 from the inner wall of the upper plastic 12, and the pole 11 is not contacted with the connecting piece 13.

Referring to fig. 5 and 8, in an embodiment, the side of the upper plastic 12 is provided with a protrusion 123, the side of the connecting piece 13 is provided with a through hole 131, and the protrusion 123 is disposed in the through hole 131.

In the above embodiment, the protruding columns 123 in the upper plastic 12 are disposed in the through holes 131 of the connecting piece 13, which increases the structural stability and mechanical strength of the pole assembly 10.

The connecting member 13 is made of a metal material such as an aluminum alloy.

Referring to fig. 1 to 3, in an embodiment, the battery top cover further includes an explosion-proof valve 50, and the cover plate 30 is provided with an explosion-proof port 303, and the explosion-proof valve 50 is disposed at the explosion-proof port 303.

In the above embodiment, the explosion-proof valve 50 includes the explosion-proof sheet and the protection film, the explosion-proof opening 303 is provided on the cover plate 30, the explosion-proof valve 50 is provided in the explosion-proof opening 303, the protection film is provided on the explosion-proof sheet and between the cover plate 30 and the upper plastic 12, when the internal pressure of the battery increases, the vaporized electrolyte can break the explosion-proof sheet, so that the heat in the power battery can be released effectively in time, and the explosion of the battery due to the excessive pressure can be avoided.

The cover plate 30 is provided with a liquid injection hole 302, and external electrolyte is injected into the battery case 4 through the liquid injection hole 302.

Referring to fig. 4, 6 and 7, in an embodiment, the battery top cover further includes a lower plastic 40, the recess 304 is disposed at one end of the cover plate 30, and a side of the cover plate 30 facing away from the sealing member 20 is clamped with the lower plastic 40; the third portion 113 protrudes from 0.05 mm to 2 mm of the lower plastic 40; the second portion 112 is 0.05 mm-2 mm above the upper plastic 12.

In the above embodiment, the lower plastic 40 is clamped with the cover plate 30, so as to be convenient for disassembly; the lower plastic 40 adopts a snap-fit structure, i.e., the lower plastic 40 is snapped onto the lower surface 305 of the cover 30. In addition, a plurality of holes are formed in the lower plastic 40 at positions corresponding to the positions below the explosion-proof valve 50, so that the pressure generated in the battery can be transmitted to the explosion-proof valve 50, potential safety hazards are reduced, and meanwhile, electrolyte can be injected into the battery shell 4 through the holes when the electrolyte is injected into the electrolyte injection holes 302.

Referring to fig. 5 and 6, in one embodiment, the upper plastic 12 is injection molded, and is fixedly connected to the connecting piece 13 and the pole 11 through an injection molding process.

In the above embodiment, the upper plastic 12 is formed by injection molding, and is fixedly connected with the connecting piece 13 and the pole 11 through an injection molding process, so that the structural stability and mechanical strength of the upper plastic 12, the connecting piece 13 and the pole 11 are stronger.

Referring to fig. 1, a second aspect of the present utility model proposes a battery including a battery case 4, a bare cell and an electrolyte contained in the battery case 4, and a battery top cover of any one of the above, the battery top cover being sealingly mounted on the battery case 4.

The battery also comprises a pole piece assembly, wherein the pole piece assembly is arranged in the battery shell and is protected.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the utility model.

Claims (9)

1. A battery top cover, which is characterized by comprising a pole assembly, a sealing piece and a cover plate; the cover plate is provided with a pole via hole, and the pole assembly is fixed with the cover plate through the sealing piece and the pole via hole; the pole assembly comprises a first pole, the first pole comprises a first part, a second part and a third part, and two end surfaces of the second part are respectively connected with the end surfaces of the first part and the third part; the pole assembly comprises an upper plastic, the upper plastic is arranged around the sealing piece, the inner wall of the upper plastic defines a pole accommodating part, and the pole is positioned in the pole accommodating part;

a groove is formed in one side, facing the sealing piece, of the cover plate, and the pole through hole is formed in the bottom of the groove; the seal is located between the second portion of the first pole and the groove; the pole assembly is clamped in the groove.

2. The battery top cover of claim 1, further comprising an electrical connection tab and a current collector, wherein the third portion of the first post is electrically connected to the electrical connection tab and the current collector, respectively.

3. The battery top cover of claim 1, wherein the post assembly further comprises a connector, one end of the connector is provided with a protrusion, the outer wall of the upper plastic is provided with a first clamping groove, and the protrusion is embedded into the first clamping groove from the outer wall of the upper plastic.

4. The battery top cover according to claim 1, wherein the corner of the pole receiving portion is provided with a second clamping groove, the outer periphery of the second portion of the first pole protrudes from the third portion, the protruding portion is a skirt of the pole, and a part of the skirt of the pole is embedded into the second clamping groove from the inner wall of the upper plastic.

5. The battery top cover of claim 3, wherein the side of the upper plastic is provided with a post, the side of the connector is provided with a through hole, and the post is disposed in the through hole.

6. The battery top cover of claim 1, further comprising an explosion-proof valve disposed on the cover plate, the explosion-proof valve disposed at the explosion-proof port.

7. The battery top cover of claim 1, further comprising a lower plastic, wherein a side of the cover plate facing away from the seal is connected to the lower plastic; the third part protrudes from the lower plastic by 0.05-2 mm; the first portion is 0.05 mm-2 mm above the upper plastic.

8. The battery top cover of claim 3, wherein the upper plastic is injection molded and is fixedly connected to the connecting piece and the pole by an injection molding process.

9. A battery comprising the battery top cover of any one of claims 1-8, a battery housing, and a bare cell and electrolyte contained within the battery housing, the battery top cover sealingly mounted to the battery housing.