CN217956088U

CN217956088U - Power battery top cap and power battery

Info

Publication number: CN217956088U
Application number: CN202222048178.6U
Authority: CN
Inventors: 邓平华; 王雷; 王世杰; 徐一剑
Original assignee: Jiangxi Baisili New Energy Technology Co ltd
Current assignee: Jiangxi Baisili New Energy Technology Co ltd
Priority date: 2022-08-04
Filing date: 2022-08-04
Publication date: 2022-12-02
Anticipated expiration: 2032-08-04

Abstract

The utility model provides a power battery top cap and power battery, this power battery top cap include the top cap piece, locate first notes liquid hole and second notes liquid hole on the top cap piece, the sealed thin slice that is equipped with in opening in first notes liquid hole, the top in first notes liquid hole is equipped with the lid, thin slice and first notes liquid hole enclose establish the chamber that holds that forms and hold electrolyte make-up liquid, the lid is equipped with the pjncture needle towards the thin slice, thereby the lid receives external force extrusion can order about the pjncture needle to the thin slice removal and puncture the thin slice and release electrolyte make-up liquid. The utility model discloses a be equipped with two notes liquid holes on the power battery top cap, so can satisfy the electrolyte demand that the long-term high performance of power battery used. The electrolyte replenishing liquid is contained in the containing cavity, when liquid replenishing is needed, the cover body can be extruded by external force at any time to puncture the thin sheet so as to release the electrolyte replenishing liquid to the interior of the power battery, therefore, the totally-closed liquid replenishing can be realized, water vapor is prevented from being introduced, the performance of the power battery is not influenced, and high-performance use can be carried out after the liquid replenishing.

Description

Power battery top cap and power battery

Technical Field

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

Background

The power battery is a novel green and environment-friendly energy storage component, has the advantages of good high-current discharge performance, high energy density, green and environment-friendliness, high energy density, long service life and the like, and is widely applied to the fields of energy storage technology, hybrid electric vehicles, communication, household appliances, war industry, aerospace and the like. However, with the increasingly improved technology of electric vehicles, electric vehicles and hybrid vehicles are closer to people's daily lives, and there is a great business opportunity, and electric vehicles have higher requirements for the capacity and safety performance of power batteries for supplying energy to the electric vehicles.

In order to meet the high capacity requirements of power batteries, sufficient electrolyte is required to sustain the transport of lithium ions. In the use process of the battery, the electrolyte is inevitably consumed under the influence of factors such as high voltage, and meanwhile, the current power battery has one electrolyte injection hole, and the electrolyte injection holes are welded and sealed after electrolyte injection in order to prevent the safety problems such as electrolyte leakage and the like, so that the electrolyte injection holes cannot be opened again for electrolyte injection in the follow-up process. Even increase interim fluid infusion hole on top cover piece, open interim fluid infusion hole in power battery use in order to carry out the fluid infusion, it is difficult to avoid introducing steam to influence its security, so this type of power battery can only regard as low grade power battery to use again.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model aims at providing a power battery top cap and power battery, this power battery top cap not only can carry out the electrolyte fluid infusion at any time, and more importantly can carry out totally closed fluid infusion to avoid the fluid infusion to introduce steam, therefore do not influence power battery's high performance and use.

In order to realize the above object, the utility model provides a power battery top cap, include the top cap piece, locate first notes liquid hole and second notes liquid hole on the top cap piece, the lower part in first notes liquid hole is equipped with the thin slice, the top in first notes liquid hole is equipped with the lid, the lid the thin slice with first notes liquid hole encloses to establish the chamber that holds that forms and hold electrolyte make-up liquid, the lid towards the thin slice is equipped with the pjncture needle, the lid receives external force extrusion can order about the pjncture needle to the thin slice removes and punctures thereby the thin slice is released electrolyte make-up liquid.

In an embodiment, the first liquid injection hole forms a stepped hole along the thickness direction of the top lid piece, the stepped hole includes a first stepped hole and a second stepped hole penetrating through the first stepped hole, the first stepped hole is located above the second stepped hole, and the sheet covers and seals the second stepped hole.

As an embodiment, the inner wall of the first stepped hole, the sheet, and the cover form the accommodation chamber.

As an embodiment, the cover includes a connecting portion and a protruding portion, the connecting portion is connected to the top cover sheet, the connecting portion extends in a direction away from the sheet to form the protruding portion, and the protruding portion is provided with the puncture needle facing the sheet.

As an embodiment, the bellying includes and is on a parallel with the platform portion of connecting portion and connection the platform portion with the intermediate part of connecting portion, the intermediate part in the lid receives external force extrusion can take place deformation.

In an embodiment, the protrusion portion is further provided with a liquid through hole penetrating through the accommodating cavity.

In one embodiment, a first sealing nail is arranged in the liquid through hole.

As an embodiment, an explosion-proof valve assembly, a first electrode unit and a second electrode unit are further arranged on the top cover sheet.

The utility model discloses the second aspect provides a power battery, include electric core, hold the casing and the sealing of electric core the aforementioned power battery top cap of casing, the pjncture needle punctures the thin slice will electrolyte make-up liquid release extremely in the casing.

In an embodiment, a second sealing nail is arranged in the second liquid injection hole.

Compared with the prior art, the utility model discloses a be equipped with the second of normally pouring into electrolyte on the power battery top cap and annotate the liquid hole and follow-up first notes liquid hole that carries out the electrolyte replenishment, so can satisfy the electrolyte demand that the long-term high performance of power battery used. The electrolyte replenishing liquid is contained in the containing cavity, when liquid replenishing is needed, the cover body can be extruded by external force at any time to puncture the thin sheet so as to release the electrolyte replenishing liquid to the interior of the power battery, therefore, the totally-closed liquid replenishing can be realized, water vapor is prevented from being introduced, the performance of the power battery is not influenced, and high-performance use can be carried out after the liquid replenishing.

Drawings

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

Fig. 2 is a bottom view of an embodiment of the top cap of the power battery of the present invention.

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

Fig. 4 is an exploded view of the power battery top cover of the present invention in a second direction.

FIG. 5 isbase:Sub>A cross-sectional view of the power cell top cover of FIG. 1 in the direction A-A.

FIG. 6 is a cross-sectional view of the power cell top cover of FIG. 1 in the direction B-B.

Fig. 7 is an enlarged view of a circled portion in fig. 5.

DESCRIPTION OF SYMBOLS IN THE DRAWINGS

100-a power battery top cover; 10-a top cover sheet; 11-a first liquid injection hole; 111-first stepped bore; 113-second step hole; 13-a second liquid injection hole; 131-third stepped holes; 133-a fourth stepped bore; 15-explosion-proof valve hole; 20-a first electrode unit; 30-a second electrode unit; 31-a seal; 40-an explosion-proof valve assembly; 41-explosion-proof valve protection sheet; 43-explosion-proof valve; 50-thin slice; 60-a cover body; 61-a connecting portion; 63-a boss; 631-an intermediate portion; 633-a platform; 65-liquid through hole; 67-puncture needle; 70-a first sealing nail; 80-a second sealing nail; 90-holding cavity

Detailed Description

To better illustrate the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the accompanying drawings. It should be noted that the following embodiments are further illustrative of the present invention and should not be construed as limiting the present invention.

A power battery generally includes a battery cell, a housing for accommodating the battery cell, and a power battery top cover for sealing the housing. In order to replenish the electrolyte in the using process of the power battery, a liquid injection hole for normally injecting the electrolyte and another liquid injection hole for subsequently replenishing the electrolyte can be arranged on the top cover of the power battery. As shown in fig. 1 to 5, the top cover 100 of the power battery comprises a top cover plate 10, a first liquid injection hole 11, a second liquid injection hole 13, an explosion-proof valve hole 15, a first electrode unit 20 and a second electrode unit 30 which are arranged on the top cover plate 10. An explosion-proof valve assembly 40 is arranged in the explosion-proof valve hole 15, and the explosion-proof valve assembly 40 comprises an explosion-proof valve 43 fixed in the explosion-proof valve hole 15 and an explosion-proof valve protection sheet 41 positioned above the explosion-proof valve 43 and sealing the explosion-proof valve hole 15. The explosion-proof valve 43 can be welded on the explosion-proof valve hole 15, or the explosion-proof valve 43 and the top cover plate 10 are integrally formed, namely, the explosion-proof valve hole 15 is a blind hole, and the thin wall formed at the bottom of the blind hole by the top cover plate 10 forms the explosion-proof valve 43. The first electrode unit 20 and the third electrode unit 30 may be of a conventional electrode unit structure, and only need to output the electrical property of the positive electrode and the negative electrode of the battery cell. The first electrode unit 20 may be a positive electrode unit or a negative electrode unit, and correspondingly, the second electrode unit 30 may be a negative electrode unit or a positive electrode unit. If the first electrode unit 20 is a positive electrode unit, the positive electrode assembly can be welded to the top cover sheet 10, or can be integrally formed with the top cover sheet 10. The second electrode unit 30 is a negative electrode unit which needs to be electrically insulated from the top cover sheet 10, for example, the second electrode unit 30 and the top cover sheet 10 are sealed and electrically insulated by a sealing member 31.

As shown in fig. 5 to 7, the sheet 50 is hermetically provided at the lower portion of the first injection hole 11, the lid 60 is provided above the first injection hole 11, the lid 60, the sheet 50 and the first injection hole 11 enclose a housing chamber 90 for housing the electrolyte replenishing liquid, the lid 60 is provided with a puncture needle 67 facing the sheet 50, and the lid 60 is pressed by an external force to drive the puncture needle 67 to move toward the sheet 50 and puncture the sheet 50 to release the electrolyte replenishing liquid.

The first pour hole 11 forms a stepped hole along the thickness direction of the top lid plate 10, the stepped hole includes a first stepped hole 111 and a second stepped hole 113 penetrating the first stepped hole 111, the first stepped hole 111 is located above the second stepped hole 113, and the sheet 50 covers and seals the second stepped hole 113. The inner wall of the first stepped hole 111, the sheet 50 and the cover 60 form the receiving chamber 90. The cover 60 includes a coupling portion 61 and a projection portion 63, the coupling portion 61 is coupled to the top sheet 10, the coupling portion 61 extends in a direction away from the sheet 50 to form the projection portion 63, and the projection portion 63 is provided with a puncture needle 67 facing the sheet 50. The protruding portion 63 includes a platform portion 633 parallel to the connecting portion 61 and an intermediate portion 631 connecting the platform portion 633 and the connecting portion 61, and the intermediate portion 631 is deformable when the cover 60 is pressed by an external force, and is configured to facilitate the application of the external force to the puncture needle 67. The boss 63 is also provided with a liquid through hole 65 which passes through the accommodation chamber 90. A first sealing peg 70 is provided in the fluid passage 65, the fluid passage 65 preferably being a counterbore. The thin sheet 50 is a corrosion-resistant aluminum sheet, and the thin sheet 50 may be welded to the first injection hole 11, or the thin sheet 50 and the top lid sheet 10 may be integrally formed, that is, the first injection hole 11 is a blind hole, and the thin wall formed at the bottom of the blind hole by the top lid sheet 10 forms the thin sheet 50.

It is further noted that a second sealing nail 80 is arranged in the second liquid injection hole 13, and the second liquid injection hole 13 is preferably a counter bore. When the power battery is manufactured or used later and the electrolyte is deficient, the cover body 60 on the first electrolyte injection hole 11 can be squeezed, and the puncture needle 67 on the cover body 60 is driven to puncture the sheet 50, so as to release the standby electrolyte into the middle shell. The totally-closed liquid supplementing mode can avoid introducing water vapor, so that the performance of the power battery is not influenced, and the power battery can still be used with high performance after liquid supplementing.

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 (100), its characterized in that includes top cap piece (10), locates first notes liquid hole (11) and second notes liquid hole (13) on top cap piece (10), the sealed thin slice (50) that are equipped with in lower part of first notes liquid hole (11), the top of first notes liquid hole (11) is equipped with lid (60), lid (60) thin slice (50) with first notes liquid hole (11) enclose to establish and form and hold chamber (90) that hold electrolyte make-up liquid, lid (60) towards thin slice (50) are equipped with pjncture needle (67), lid (60) receive external force extrusion can drive pjncture needle (67) to thin slice (50) remove and pierce thereby thin slice (50) release electrolyte make-up liquid.

2. The top cover (100) of the power battery according to claim 1, wherein the first liquid injection hole (11) is formed with a stepped hole along the thickness direction of the top cover sheet (10), the stepped hole comprises a first stepped hole (111) and a second stepped hole (113) communicated with the first stepped hole (111), the first stepped hole (111) is positioned above the second stepped hole (113), and the sheet (50) covers and seals the second stepped hole (113).

3. The power cell top cover (100) according to claim 2, wherein the inner wall of the first stepped hole (111), the sheet (50) and the cover body (60) form the receiving cavity (90).

4. The power cell top cover (100) according to claim 1, wherein the cover body (60) comprises a connecting portion (61) and a protruding portion (63), the connecting portion (61) is connected to the top cover sheet (10), the connecting portion (61) extends in a direction away from the thin sheet (50) to form the protruding portion (63), and the protruding portion (63) is provided with the puncture needle (67) facing the thin sheet (50).

5. The power cell top cover (100) according to claim 4, wherein the protrusion (63) comprises a platform part (633) parallel to the connecting part (61) and an intermediate part (631) connecting the platform part (633) and the connecting part (61), wherein the intermediate part (631) is deformable when the cover body (60) is pressed by an external force.

6. The power cell top cover (100) according to claim 4, wherein the protrusion (63) is further provided with a liquid through hole (65) penetrating through the accommodating cavity (90).

7. The power battery top cover (100) according to claim 6, wherein a first sealing nail (70) is arranged in the liquid through hole (65).

8. The power battery top cover (100) according to claim 1, wherein the top cover sheet (10) is further provided with an explosion-proof valve assembly (40), a first electrode unit (20) and a second electrode unit (30).

9. A power cell comprising a cell, a housing containing the cell, and a power cell cap (100) according to any one of claims 1 to 8 sealing the housing, the piercing needle (67) piercing the sheet (50) and releasing the electrolyte replenishment solution into the housing.

10. The power battery according to claim 9, characterized in that a second sealing nail (80) is arranged in the second liquid injection hole (13).