CN219321488U

CN219321488U - Lithium battery lead sealing structure

Info

Publication number: CN219321488U
Application number: CN202320289961.3U
Authority: CN
Inventors: 王从周; 苏峰; 卢兵荣; 陈莉; 曹勇; 凌生斌
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2023-02-17
Filing date: 2023-02-17
Publication date: 2023-07-07
Anticipated expiration: 2033-02-17

Abstract

The utility model discloses a lithium battery lead sealing structure, which comprises a battery core top cover plate and a hollow sealing shell, wherein the sealing shell is fixed on the outer side surface of the battery core top cover plate, one end of a lead sequentially penetrates through the sealing shell and the battery core top cover plate and stretches into a battery core, a liquid injection hole is formed in the sealing shell, and filling glue is injected into the sealing shell through the liquid injection hole; the sealing structure realizes good sealing on wires connecting the inside and the outside of the battery cell, improves the triggering sensitivity of thermal runaway of the battery cell, and has no bad liquid leakage in the use process of the battery.

Description

Lithium battery lead sealing structure

Technical Field

The utility model relates to the technical field of lithium battery preparation, in particular to a lead sealing structure of a lithium battery.

Background

Lithium ion batteries are known as a green chemical energy source in the 21 st century, and are widely applied to various fields such as 3C consumer electronics, power batteries, energy storage and the like. The square battery has the advantages of high packaging reliability, high system energy efficiency, light weight, high energy density, relatively convenient expansion and high manufacturing automation degree, and the market share of the square battery is rapidly promoted along with the rapid development of new energy and energy storage industries.

When the lithium battery is used at a low temperature, the problem of reduced charge and discharge capacity can be solved, so that the endurance mileage of the automobile is reduced, and customer dissatisfaction is caused. At present, an external heating mode is generally adopted, and the heating efficiency is low and the heating time is long. In addition, to evaluate the safety problem of the cell, it is also necessary to heat the cell from inside the cell to trigger thermal runaway. The preparation of the battery core needs to use a lead to penetrate through the lithium battery shell, and the sealing of the lead has become a difficult problem for restricting the manufacturing of the internal heating battery due to electrolyte in the battery core.

Disclosure of Invention

Based on the technical problems in the background art, the utility model provides a lithium battery lead sealing structure, which can be used for forming good sealing on leads connecting the inside and the outside of a battery core, improving the triggering sensitivity of thermal runaway of the battery core and avoiding poor liquid leakage in the use process of the battery.

The utility model provides a lead sealing structure of a lithium battery, which comprises a battery core top cover plate and a hollow sealing shell, wherein the sealing shell is fixed on the outer side surface of the battery core top cover plate, one end of a lead sequentially penetrates through the sealing shell and the battery core top cover plate to extend into a battery core, and a cavity of the sealing shell is filled with filling glue.

Further, the sealing shell is provided with a liquid injection hole, and filling glue is injected into the sealing shell through the liquid injection hole.

Further, the liquid injection hole is formed in the sealing shell in the direction away from the top cover plate of the battery cell.

Further, the periphery of the liquid injection hole is provided with a funnel, and a cavity of the funnel is communicated with the liquid injection hole.

Further, a cover plate hole is formed in the top cover plate of the battery cell, a through hole is formed in the sealing shell, and one end of the wire sequentially penetrates through the through hole and the cover plate hole and stretches into the battery cell.

Further, the cover plate hole and the through hole are coaxially arranged.

Further, the filling glue is aluminum-based sealant

Further, the sealing shell is made of aluminum alloy.

The lithium battery lead sealing structure provided by the utility model has the advantages that: the lead sealing structure of the lithium battery provided by the structure of the utility model has the advantages that the lead is sealed by the filling glue, the reliability of the lead sealing structure is high, the good sealing of the lead connecting the inside and the outside of the battery core can be realized, the triggering sensitivity of the thermal runaway of the battery core is improved, and no liquid leakage defect exists in the use process of the battery.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic illustration of the structure of FIG. 1 with wires removed;

the battery cell comprises a 1-battery cell top cover plate, a 2-sealing shell, 3-filling glue, 4-liquid injection holes, 5-cover plate holes, 6-through holes and 7-wires.

Detailed Description

In the following detailed description of the present utility model, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the utility model, which is therefore not limited to the specific embodiments disclosed below.

As shown in fig. 1 and 2, the lead sealing structure of a lithium battery provided by the utility model comprises a battery core top cover plate 1 and a hollow sealing shell 2, wherein the sealing shell 2 is fixed on the outer side surface of the battery core top cover plate 1, one end of a lead 7 sequentially penetrates through the sealing shell 2 and the battery core top cover plate 1 to extend into a battery core, and a cavity of the sealing shell 2 is filled with filling glue 3.

The wire 7 seals through filling glue 3, and wire 7 seal structure reliability is high, can realize forming good sealedly to connecting the inside wire 7 with outside of electric core, can carry out thermal runaway detection through wire 7, has improved electric core thermal runaway's trigger sensitivity, can carry out inside heating through the wire to electric core in addition, improves electric core heating efficiency, shortens heating time.

Wherein, set up on the seal housing 2 and annotate liquid hole 4, seal housing 2 pours into through annotating liquid hole 4 and fills gluey 3, and wherein annotate liquid hole 4 and set up on keeping away from seal housing 2 of electric core lamina tecti 1 direction, be convenient for annotate liquid in to seal housing 2 through annotating liquid hole 4 for seal housing 2 is full of and fills glues 3, fills glues 3 and adopts aluminium base sealant, has temperature resistance good, insulating good, ageing resistance good advantage, has good sealed effect to wire 7.

Because the general size of annotate liquid hole 4 is not big, when annotating the liquid through annotating liquid hole 4, in order to avoid filling glue 3 to spill over in annotating the liquid, can set up the funnel at annotating liquid hole 4 periphery, the cavity and the annotating liquid hole 4 intercommunication of funnel to improve the notes liquid efficiency of filling glue 3.

In addition, the sealing shell 2 is made of aluminum alloy, has good sealing performance, durability, corrosion resistance, good heat dissipation and capability of effectively dissipating heat of the filling glue 3 and avoiding corrosion defects of the filling glue 3 to the sealing shell 2.

In this embodiment, offer the apron hole 5 on the electric core lamina tecti 1, offered through-hole 6 on the seal housing 2, the one end of wire 7 is passed through-hole 6, apron hole 5 in proper order stretches into in the electric core, after wire 7 stretches into in the electric core, seals through-hole 6, apron hole 5 through filling glue 3, avoids electrolyte in the electric core to spill over from through-hole 6, apron hole 5, causes the defect that the electric core damaged. In order to prevent the wire 7 from being bent, causing a defect of poor sealing, the cover plate hole 5 and the through hole 6 are coaxially provided.

The using process comprises the following steps: one end of the wire 7 sequentially penetrates through the through hole 6 and the cover plate hole 5 to extend into the battery cell, filling glue is injected into the hollow cavity of the sealing shell 2 through the liquid injection hole 4 until the hollow cavity of the sealing shell 2 is filled, curing is carried out, good sealing is formed on the wire 7 after the sealing glue is cured, and then normal baking, electrolyte injection, formation, sealing, capacity division and other procedures are carried out; therefore, the battery of the embodiment has good sealing effect, and no liquid leakage is bad in the use process of the battery.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a lithium cell wire seal structure, its characterized in that includes electric core lamina tecti (1) and hollow seal housing (2), and seal housing (2) are fixed in the lateral surface of electric core lamina tecti (1), and the one end of wire (7) passes seal housing (2), electric core lamina tecti (1) in proper order and stretches into in the electric core, and the cavity of seal housing (2) is filled with packing and is glued (3).

2. The lithium battery lead sealing structure according to claim 1, wherein the sealing shell (2) is provided with a liquid injection hole (4), and the sealing shell (2) is injected with the filling glue (3) through the liquid injection hole (4).

3. The lithium battery lead sealing structure according to claim 2, wherein the liquid injection hole (4) is formed in the sealing shell (2) far away from the direction of the top cover plate (1) of the battery cell.

4. A lithium battery lead sealing structure according to claim 3, wherein a funnel is arranged at the periphery of the liquid injection hole (4), and a cavity of the funnel is communicated with the liquid injection hole (4).

5. The lithium battery lead sealing structure according to claim 1, wherein the top cover plate (1) of the battery cell is provided with a cover plate hole (5), the sealing shell (2) is provided with a through hole (6), and one end of the lead (7) sequentially penetrates through the through hole (6) and the cover plate hole (5) to extend into the battery cell.

6. The lithium battery lead sealing structure according to claim 5, wherein the cover plate hole (5) and the through hole (6) are coaxially arranged.

7. The lithium battery lead sealing structure according to any one of claims 1 to 6, wherein the filler paste (3) is an aluminum-based sealant.

8. The lithium battery lead sealing structure according to any one of claims 1 to 6, wherein the sealing case (2) is made of aluminum alloy.