CN202585607U

CN202585607U - Combined nut cap of lithium ion battery

Info

Publication number: CN202585607U
Application number: CN2012202300990U
Authority: CN
Inventors: 董竹
Original assignee: INFINITY ENERGY (SUZHOU) CO Ltd
Current assignee: INFINITY ENERGY (SUZHOU) CO Ltd
Priority date: 2012-05-22
Filing date: 2012-05-22
Publication date: 2012-12-05
Anticipated expiration: 2022-05-22

Abstract

The utility model discloses a combined nut cap of a lithium ion battery. The combined nut cap comprises a sealing cover, an upper sheet metal, a lower sheet metal, a sealing ring, a spring and a decompression valve, wherein the sealing cover is arranged at the upper position, the upper sheet metal is arranged under the sealing cover and is provided with a decompression hole, the lower sheet metal is arranged under the upper sheet metal, the sealing ring is covered on the periphery of the upper sheet metal, one end of the spring is arranged at the inner wall of the sealing cover, and the decompression valve is arranged at the other end of the spring and can be used for sealing/opening the decompression hole. According to the combined nut cap of the lithium ion battery, disclosed by the utility model, the design is ingenious, the internal resistance of a battery can be reduced to a large extent, the decompression and the power interruption can be carried out in time, and the safety performance of the lithium ion battery can be increased.

Description

Lithium ion battery combination block

Technical field

The utility model relates to a kind of lithium ion battery combination block.

Background technology

Current, to the column lithium ion battery of each manufacturer production, combination cover cap all adopts PTC (Positive Temperature Coefficient semistor) combining structure usually; Be PTC type combination cover cap again; The positive terminal that is used for lithium ion battery, in process of production, expose the upper end of combination cover cap; Be used to connect outside line, the lower end connects positive pole one end of lithium ion battery inner chamber; In the charging process of producing, the inner chemical reaction that takes place, this chemical reaction can produce multi-component gas, and the generation of gas causes the rising of inside lithium ion cell air pressure, and gas can't discharge, and just makes battery in use have hidden danger to exist; On the other hand, when situation that battery is short-circuited because of force majeure, the PTC in the combination cover cap starts working: when short circuit; Electric current increases, and temperature raises, and PTC begins the rising with temperature; Resistance also begins to raise, and the rising of resistance has hindered the increase of electric current again, thereby realizes the function of protection; Although but PTC has hindered the rising of battery temperature, can not cut off fully, hidden danger still exists, and PTC itself has certain internal resistance, is unfavorable for the electrical property performance of lithium ion battery.Therefore become those skilled in the art's technical problem anxious to be solved.

Summary of the invention

Defective in view of above-mentioned prior art existence; The utility model purpose is to propose in order to overcome above-mentioned shortcoming when battery generation security incident, to cut off cell circuit fully; And can internal pressure be discharged fully through relief valve, inner and outer air pressure keeps a kind of lithium ion battery combination block of basically identical.

For realizing above-mentioned purpose; The technical scheme of the utility model is: a kind of lithium ion battery combination block, it comprises: be arranged on the top capping, be arranged on capping below and be provided with the last sheet metal of a relief hole, the following sheet metal that is arranged on the sheet metal below, bag be buckled in sheet metal peripheral sealing ring, an end be arranged on the spring of capping inwall and be arranged on the spring other end also salable/relief valve of unlatching relief hole.

On the basis of technique scheme, further comprise attached technical scheme:

It comprises that further wherein capping has several air vent holes at fuse between the center of upper and lower sheet metal and the insulated ring between the upper and lower sheet metal outside.

Said go up sheet metal comprise the anti-package limit that is positioned at the outside and is connected through laser spot welding with capping and with insulated ring against the kink that contacts.

The diameter of said down sheet metal is less than the diameter of last sheet metal, and relief hole is between the center and all sides of last sheet metal, and the melting temperature of fuse is 60-80 ℃.

The utility model design is ingenious, reduces the internal resistance of cell significantly, promotes the security performance of lithium ion battery.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the front view of the utility model.

Fig. 2 is the cutaway view of the utility model.

Embodiment

Embodiment: shown in Fig. 1-2; The utility model provides a kind of specific embodiment of lithium ion battery combination block, and it comprises: be arranged on the capping 10 of top, the last sheet metal 20 that is arranged on capping 10 belows, the following sheet metal 30 that is arranged on sheet metal 20 belows, bag be buckled in sheet metal 20 peripheral sealing ring 40, ends be arranged on capping 10 inwalls spring 50, be arranged on spring 50 other ends also can be resisted against the relief valve 60 of sheet metal 20, at insurance 70 between the center of upper and

lower sheet metal

20,30 and the insulated ring 80 between upper and

lower sheet metal

20,30 outsides.Wherein capping 10 has several air vent holes 12.

Last sheet metal 20 comprise be positioned at the outside and the anti-package limit 22 that is connected through laser spot welding with capping 10, with insulated ring 80 against the kink that contacts 24 and can be by the relief hole 26 of relief valve 60 sealing/unlatchings.The diameter of following sheet metal 30 is less than the diameter of last sheet metal 20, and upper and

lower sheet metal

20,30 is preferably aluminium flake.Sealing ring 40, relief valve 60, insulated ring 80 all adopt plastic material, are preferably the PP material.The melting temperature of insurance 70 is preferably 60-80 ℃.

When lithium ion battery when carrying out primary charging, upper and lower sheet metal 20, the cavity between 30 produce gas, air pressure raises; When air pressure reached the 0.8-1.4Mpa left and right sides, relief valve 60 overcame the elastic force of spring 50 and opens relief hole 26, and gas is discharged from air vent hole 12; After gas was discharged, air pressure inside reduced, and relief valve 60 receives the pressure of spring 50; Hold out against relief hole 26, the reduction sealing state;

In case and lithium ion battery is when security incident such as being short-circuited, short circuit causes electric current sharply to raise, and temperature raises thereupon, and air pressure raises with the rising of temperature again, when air pressure reaches 0.8-1.4Mpa, and relief valve 60 stressed unlatching relief holes 26, gas is discharged; The high temperature that simultaneously big electric current causes, the fuse 70 that can directly fuse thoroughly cuts off the entire cell loop thus, avoids gathering and the danger that sets off an explosion of lasting rising and the energy of temperature.

The utility model removes the PTC protection structure of prior art, has adopted fuse and relief valve to substitute, and fills up the position that PTC encircles through the anti-package limit of last sheet metal, has increased the sealing of battery, and has reduced the internal resistance of cell significantly; When battery is short-circuited security incident, through the timely cut-off loop of the fusing of fuse; Battery carry out primary charging and security incident such as be short-circuited in, the timely pressure release of relief valve has promoted the security performance of battery greatly.The utility model design is ingenious, and fail safe is good, and is easy to implement.

Certainly the foregoing description only is the technical conceive and the characteristics of explanation the utility model, and its purpose is to let the people who is familiar with this technology can understand content of the utility model and enforcement according to this, can not limit the protection range of the utility model with this.All equivalent transformation or modifications of doing according to the spirit of the utility model main technical schemes all should be encompassed within the protection range of the utility model.

Claims

1. lithium ion battery combination block is characterized in that it comprises: be arranged on the top capping (10), be arranged on capping (10) below and be provided with the last sheet metal (20) of a relief hole (26), the following sheet metal (30) that is arranged on sheet metal (20) below, bag be buckled in sheet metal (20) peripheral sealing ring (40), an end be arranged on the spring (50) of capping (10) inwall and be arranged on spring (50) other end also salable/relief valve (60) of unlatching relief hole (26).

2. according to the lithium ion battery combination block of claim 1; It is characterized in that: it further comprises the fuse (70) between the center that is positioned at upper and lower sheet metal (20,30) and is positioned at the insulated ring (80) between upper and lower sheet metal (20, the 30) outside that wherein capping (10) has several air vent holes (12).

3. according to the lithium ion battery combination block of claim 2, it is characterized in that: said go up sheet metal (20) comprise the anti-package limit (22) that is positioned at the outside and is connected through laser spot welding with capping (10) and with insulated ring (80) against the kink that contacts (24).

4. according to the lithium ion battery combination block of claim 3; It is characterized in that: the diameter of said sheet metal (30) down is less than the diameter of last sheet metal (20); And relief hole (26) is positioned between the center and all sides of sheet metal (20), and the melting temperature of fuse (70) is 60-80 ℃.