CN219321479U

CN219321479U - Cover plate assembly and battery

Info

Publication number: CN219321479U
Application number: CN202320185060.XU
Authority: CN
Inventors: 赵小龙; 孙飞; 张敏辉
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2023-07-07
Anticipated expiration: 2033-01-30

Abstract

The utility model discloses a cover plate assembly and a battery. The cover plate assembly includes: the cover plate is provided with a liquid injection hole; the lower plastic part is connected to the cover plate, the lower plastic part is provided with a diversion groove and a plurality of diversion holes, the diversion holes are communicated with the diversion groove, the diversion groove is used for diverting electrolyte injected through the liquid injection hole, and the diversion hole is used for flowing out the electrolyte. The cover plate component can realize the diversion of the electrolyte and improve the infiltration effect of the electrolyte in the battery cell.

Description

Cover plate assembly and battery

Technical Field

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

Background

The lithium battery is widely applied to the technical fields of portable electronic equipment, electric automobiles, aerospace and the like due to the advantages of high energy density, light weight and the like.

The existing power battery mainly comprises a shell, a top cover assembly, a positive pole column, a negative pole column and a battery cell, wherein the battery cell is arranged in the shell, and the top cover assembly is used for sealing an opening of the shell. Wherein, top cap subassembly includes a plurality of components such as top cap piece and lower plastic spare, and lower plastic spare mainly plays insulating effect.

When the lithium battery is produced, electrolyte is required to be injected into the battery cell according to the required amount through the liquid injection hole reserved in the top cover assembly. In the current liquid injection mode, electrolyte directly flows into the shell after being injected through the liquid injection hole, so that the infiltration effect is poor.

Disclosure of Invention

To solve at least one of the problems with the prior art described above, according to one aspect of the present utility model, there is provided a cover plate assembly comprising: the cover plate is provided with a liquid injection hole; the lower plastic part is connected to the cover plate, a flow dividing groove and a plurality of flow dividing holes are formed in the lower plastic part, the flow dividing holes are communicated with the flow dividing groove, the flow dividing groove is used for dividing electrolyte injected through the liquid injection hole, and the flow dividing holes are used for flowing out the electrolyte.

Like this, through set up spread groove and reposition of redundant personnel hole on lower plastic spare to when injecting electrolyte from annotating the liquid hole, at first through the reposition of redundant personnel of spread groove, flow to the more region of apron cover, again flow through the reposition of redundant personnel hole, make the electrolyte of injection obtain the dispersion, reduced the impact of electrolyte to the electric core, promote annotate liquid efficiency, guarantee the infiltration effect of electrolyte in the electric core, guarantee the electric performance of electric core.

In some embodiments, the cover plate is provided with two pole holes, the shunt groove comprises an annular groove and a middle groove which are communicated, the annular groove is wound on the periphery of the lower plastic part, the middle groove and the two pole holes are arranged in a space formed by surrounding the annular groove, the middle groove corresponds to the liquid injection hole, and the two pole holes are positioned on two sides of the middle groove.

In some embodiments, the middle groove comprises a longitudinal flow passage and at least one transverse flow passage which are communicated with each other, the longitudinal flow passage is communicated with the annular groove, and the transverse flow passage is arranged corresponding to the liquid injection hole.

In some embodiments, the longitudinal flow channels communicate with opposite sides of the annular groove.

In some embodiments, an explosion-proof valve air hole is formed in the middle of the cover plate, and the longitudinal flow channel is arranged corresponding to the explosion-proof valve air hole.

In some embodiments, the annular groove and the middle groove are both provided with the diversion holes.

In some embodiments, the shunt channels have a depth ranging from 0.9 cm to 1.1cm.

In some embodiments, a mounting groove is formed in one side, away from the battery cell, of the cover plate, and the liquid injection hole is formed in the bottom wall of the mounting groove.

In some embodiments, the cover plate is provided with a pressure relief hole, and the pressure relief hole is arranged close to the liquid injection hole and is arranged on the bottom wall of the mounting groove.

In one aspect, the utility model provides a battery comprising a cover plate assembly as described above

Drawings

FIG. 1 is a schematic view of a cover assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the cover assembly of FIG. 1 from another perspective;

fig. 3 is an exploded view of the cover plate assembly of fig. 1.

Wherein the reference numerals have the following meanings:

100-cover plate components, 10-cover plates, 11-liquid injection holes, 12-pole holes, 13-mounting grooves, 14-pressure relief holes, 15-explosion-proof valve air holes, 20-lower plastic parts, 21-diversion grooves, 211-annular grooves, 212-middle grooves, 2121-longitudinal flow passages, 2122-transverse flow passages and 22-diversion holes.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements 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.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The utility model is described in further detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, a cover assembly 100 according to an embodiment of the utility model includes a cover 10 and a lower plastic member 20.

Wherein, the cover plate 10 is provided with a liquid injection hole 11 and two pole holes 12; the lower plastic part 20 is connected to one side of the cover plate 10 facing the battery cell, the lower plastic part 20 is provided with a shunt groove 21 and a plurality of shunt holes 22, the shunt holes 22 are communicated with the shunt groove 21, the shunt groove 21 is used for shunting electrolyte injected through the liquid injection hole 11, and the shunt holes 22 are used for flowing out the electrolyte.

Above-mentioned apron subassembly 100 is through setting up spread groove 21 and reposition of redundant personnel hole 22 on lower plastic part 20 to when injecting electrolyte from annotating liquid hole 11, at first through the reposition of redundant personnel of spread groove 21, flow to the more region that apron 10 covered, again flow out through reposition of redundant personnel hole 22, make the electrolyte of injection obtain dispersing, reduced the impact of electrolyte to the electric core, promote annotate liquid efficiency, guarantee the infiltration effect of electrolyte in the electric core, guarantee the electric performance of electric core.

Referring to fig. 2 and 3, in an embodiment of the present utility model, in order to fully ensure the dispersion effect of the electrolyte, the shunt tank 21 includes an annular groove 211 and a middle groove 212 which are communicated, the annular groove 211 is wound around the outer periphery of the lower plastic member 20, the middle groove 212 and two pole holes 12 are disposed in a space formed by surrounding the annular groove 211, the middle groove 212 is disposed corresponding to the electrolyte injection hole 11, and the two pole holes 12 are disposed at two sides of the middle groove 212, so that the shunt tank 21 is disposed to include two parts, and receives the electrolyte injected from the electrolyte injection hole 11 through the middle groove 212 facing the electrolyte injection hole 11 and flows into the annular groove 211 on the outer periphery, and finally flows out through the shunt holes 22 disposed on the annular groove 211 and the middle groove 212, thereby achieving the effect of fully dispersing the electrolyte through the annular groove 211 and the middle groove 212, dispersing the electrolyte into more areas in the casing, so that the electrolyte is fully infiltrated into the cell, and the electrical performance of the cell is ensured.

It can be appreciated that, in order to ensure the dispersion effect of the electrolyte, in this embodiment, the annular groove 211 and the middle groove 212 are provided with the flow dividing holes 22, so that the electrolyte can flow out from the annular groove 211 and the middle groove 212, and the effect of fully dispersing the electrolyte is achieved.

It can be appreciated that, because the whole shunt groove 21 has a certain extending height towards the direction of the battery core, and the pole hole 12 is located in the space formed by the annular groove 211, that is, the pole lug of the battery core can be located in the surrounding area, the extrusion of the lower plastic part 20 can not be received, when the top cover assembly 100 is installed with the shell, the lower plastic part 20 is inserted into the battery core, therefore, compared with the structure of the cover plate assembly 100 in the prior art, the cover plate assembly 100 in the embodiment can cancel the structure of the retainer of the pole lug, simplify the structure of the whole cover plate assembly 100, simplify the assembly process, and improve the production line efficiency.

Specifically, the depth range of the shunt groove 21 in the embodiment from the cover plate 10 to the direction of the battery core is 0.9-1.1cm, that is, compared with the lower plastic part in the prior art, the height of the lower plastic part in the embodiment is increased, when the shunt groove is arranged in the range of 0.9-1.1cm, a certain accommodating space can be provided for the tab, the shunt groove can be matched with the installation of the battery, and a certain temporary storage volume of electrolyte is provided, when the electrolyte is injected from the electrolyte injection hole 11, the electrolyte can be quickly temporarily stored in the temporary storage volume, so that the electrolyte can be quickly injected, and the effect of improving the electrolyte injection efficiency is achieved.

In order to ensure the flow distribution uniformity of the electrolyte in the middle position, the middle groove 212 includes a longitudinal flow channel 2121 and at least one transverse flow channel 2122 which are mutually communicated, the longitudinal flow channel 2121 is communicated with the annular groove 211, and the transverse flow channel 2122 is opposite to the liquid injection hole 11, so that when the electrolyte is injected from the liquid injection hole 11, the electrolyte flows to the transverse flow channel 2122, then flows to the longitudinal flow channel 2121 from the transverse flow channel 2122, and flows to the annular groove 211 from the longitudinal flow channel 2121, and the electrolyte dispersing effect is realized.

Specifically, in order to enable the electrolyte to uniformly flow through the entire annular groove 211, the longitudinal flow channels 2121 are communicated with opposite sides of the annular groove 211, so that the electrolyte in the longitudinal flow channels 2121 flows to the annular groove 211 through two ends of the longitudinal flow channels 2121, and each area in the annular groove 211 can be quickly flowed with the electrolyte, so that the dispersion speed of the electrolyte is improved, and meanwhile, the dispersion uniformity of the electrolyte is ensured.

Specifically, the middle groove 212 in this embodiment is cross-shaped and includes two opposite transverse flow channels 2122, so that the annular groove 211 encloses a cell region corresponding to the formed space, and can flow in electrolyte through the transverse flow channels 2122, thereby further ensuring the dispersion uniformity of the electrolyte.

The cover plate 10 in this embodiment is further provided with an explosion-proof valve air hole 15, the longitudinal flow channel 2121 is opposite to the explosion-proof valve air hole 15, that is, the middle groove 212 is symmetrically arranged, and the whole splitter box 21 is symmetrically arranged, so that the splitter box 21 is symmetrically arranged, the splitting uniformity of the splitter box 21 to the electrolyte is ensured, and meanwhile, the die sinking molding of the whole lower plastic part 20 is ensured.

The diversion holes 22 in the present embodiment are circular and uniformly formed on the bottom wall of the entire diversion trench 21, and in other embodiments, the diversion holes 22 may be formed in other shapes, such as square, body shape, etc., but not limited thereto.

Referring to fig. 1, in an embodiment of the present utility model, in order to protect a battery cell during use, a mounting groove 13 is formed on a side of a cover plate 10 facing away from the battery cell, and a liquid injection hole 11 is formed on a bottom wall of the mounting groove 13, so that a protective cover can be disposed at a position of the mounting groove 13 by disposing the mounting groove 13 on the cover plate 10 to cover the mounting groove 13, thereby sealing the liquid injection hole 11 to protect the battery cell.

In order to improve the safety of liquid injection, the cover plate 10 is provided with a pressure relief hole 14, the pressure relief hole 14 is close to the liquid injection hole 11 and is arranged on the bottom wall of the mounting groove 13, namely, in the embodiment, a double-hole liquid injection mode is adopted, electrolyte is injected from the liquid injection hole 11 in the liquid injection process, when gas is generated in the shell, the gas is discharged from the pressure relief hole 14, the isobaric liquid injection is realized in a closed environment, and the situation that the electrolyte overflows or splashes into the pole hole 12 to cause conduction between the anode pole and the shell during liquid injection is avoided.

In another embodiment, the utility model further provides a battery, including the above cover assembly 100, including a housing and a battery cell disposed in the housing, where the cover assembly 100 is used for sealing the housing.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. The apron subassembly, its characterized in that includes:

a cover plate (10) provided with a liquid injection hole (11);

the lower plastic part (20) is connected to the cover plate (10), a shunt groove (21) and a plurality of shunt holes (22) are formed in the lower plastic part (20), the shunt holes (22) are communicated with the shunt groove (21), the shunt groove (21) is used for shunting electrolyte injected through the liquid injection hole (11), and the shunt holes (22) are used for flowing out the electrolyte.

2. The cover plate assembly according to claim 1, wherein the cover plate (10) is provided with two pole holes (12), the shunt groove (21) comprises an annular groove (211) and a middle groove (212) which are communicated, the annular groove (211) is wound on the periphery of the lower plastic part (20), the middle groove (212) and the two pole holes (12) are arranged in a space formed by the annular groove (211), the middle groove (212) is arranged corresponding to the liquid injection hole (11), and the two pole holes (12) are positioned on two sides of the middle groove (212).

3. The cover plate assembly according to claim 2, wherein the middle groove (212) comprises a longitudinal flow passage (2121) and at least one transverse flow passage (2122) which are communicated with each other, the longitudinal flow passage (2121) is communicated with the annular groove (211), and the transverse flow passage (2122) is arranged corresponding to the liquid injection hole (11).

4. A cover plate assembly according to claim 3, wherein the longitudinal flow channels (2121) communicate with opposite sides of the annular groove (211).

5. A cover plate assembly according to claim 3, wherein an explosion-proof valve air hole (15) is formed in the middle of the cover plate (10), and the longitudinal flow passage (2121) is arranged corresponding to the explosion-proof valve air hole (15).

6. The cover plate assembly according to any one of claims 2 to 5, wherein the annular groove (211) and the middle groove (212) are provided with the diversion holes (22).

7. A cover plate assembly according to any one of claims 1 to 5, wherein the shunt grooves (21) have a depth in the range of 0.9-1.1cm.

8. The cover plate assembly according to any one of claims 1 to 5, wherein a mounting groove (13) is formed in the side, facing away from the battery cell, of the cover plate (10), and the liquid injection hole (11) is formed in the bottom wall of the mounting groove (13).

9. The cover plate assembly according to claim 8, wherein the cover plate (10) is provided with a pressure relief hole (14), and the pressure relief hole (14) is arranged close to the liquid injection hole (11) and is arranged on the bottom wall of the mounting groove (13).

10. Battery, characterized in that it comprises a cover assembly (100) according to any one of claims 1 to 9.