CN100592566C - Lithium ion battery with aluminum case - Google Patents

Lithium ion battery with aluminum case Download PDF

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Publication number
CN100592566C
CN100592566C CN200810124637A CN200810124637A CN100592566C CN 100592566 C CN100592566 C CN 100592566C CN 200810124637 A CN200810124637 A CN 200810124637A CN 200810124637 A CN200810124637 A CN 200810124637A CN 100592566 C CN100592566 C CN 100592566C
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CN
China
Prior art keywords
cap
packing ring
shell
lithium ion
battery
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Application number
CN200810124637A
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Chinese (zh)
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CN101345293A (en
Inventor
吴晓东
王超
吕伟
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Phylion battery Limited by Share Ltd
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SUZHOU PHYLION BATTERY CO Ltd
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Priority to CN200810124637A priority Critical patent/CN100592566C/en
Publication of CN101345293A publication Critical patent/CN101345293A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses an aluminium shell lithium ion battery, comprising a shell cover, a sell and an anode/cathode sheet which is contained inside the shell; the shell cover is provided with two electrode lead-out holes which are respectively connected with an anode electrode sealing structure and a cathode electrode sealing structure; the electrode sealing structure comprises a connecting sheet, rivets which are arranged by passing through rivet holes on the battery shell cover, a convex washer which is arranged between the battery shell cover and the rivets, and a concave washer which isarranged between the shell cover and the connecting sheet; the shell cover and the shell are both aluminium shells; at least one of the concave washer and the convex washer of the anode electrode sealing structure is composed of conductive plastic; and the resistance value of the conductive plastic is 10<2> to 10<4> Omega. The aluminium shell lithium ion battery of the invention is prepared by thealuminium shell, can effectively prevent the aluminium shell from being corroded by electrolyte; furthermore, the aluminium shell lithium ion battery is safe and reliable and generates no fire phenomenon.

Description

A kind of aluminum hull lithium ion battery
Technical field
The present invention relates to a kind of battery that can repeatedly discharge and recharge, be specifically related to a kind of aluminum hull lithium ion battery.
Background technology
Lithium ion battery is owing to have advantages such as in light weight, that volume is little, capacitance is big, charging rate is fast, is widely used on the vehicles such as all kinds of numbers, communication product and electric bicycle, electric automobile such as notebook computer.
Existing lithium ion battery generally includes housing and is contained in the interior both positive and negative polarity pole piece of housing, barrier film and electrolyte, pole piece is provided with lug, housing one end opening, and cover opening by cap, form hermetically-sealed construction by welding between cap and housing, described cap is provided with two electrode fairleads, be connected with anode electrode hermetically-sealed construction and negative electrode hermetically-sealed construction respectively, described electrode sealing construction is, on the cap at electrode fairlead place, be respectively equipped with the recessed pad and the protruding pad of cooperation below, protruding pad lower surface is provided with the electrode lug, recessed pad upper surface is provided with brace, is fixedly connected on the cap by rivet, thereby the electrode lug is drawn out to outside the cell body by metal rivet, simultaneously, by the recessed pad that cooperates and protruding pad itself and cap are separated and realize sealing.
At present, the housing of lithium ion battery and cap generally use stainless steel case, because of it has the corrosion that corrosion resistance can effectively prevent electrolyte, yet, the price of stainless steel material is higher and density is bigger, and when being applied to the battery pack of big capacity large volume, not only cost of manufacture is higher, make that also the weight of battery itself is bigger, be unfavorable for using.
For addressing the above problem, people attempt the housing of battery and cap are replaced with aluminum hull, to reduce battery cost and weight; Yet, find in the test, because the chemical property of aluminium is much more active than stainless steel, very easily be subjected to the corrosion of electrolyte.In order to prevent that aluminum hull is corroded, with anode electrode and cap conducting, aluminum hull and anodal current potential are consistent, its implementation is that a kind of or both in the recessed pad in the anodal hermetically-sealed construction, the protruding pad is replaced to metallic gasket.This method can solve the etching problem of electrolyte to aluminum hull, yet, in actual fabrication and use, cause short circuit thereby short circuit very easily occurs because of distance is short between brace in the anodal hermetically-sealed construction and the housing and since metallic gasket resistance minimum, have only the milliohm level usually, the electric current that produces during short circuit is very big, spark phenomenon occurs, further initiation potential causes potential safety hazard.Thereby the lithium ion battery of aluminum hull still fails to enter suitability for industrialized production.
Summary of the invention
The purpose of this invention is to provide a kind of aluminum hull lithium ion battery, should prevent electrolyte corrosion aluminum hull, guarantee safe and reliablely again, spark phenomenon can not occur.
To achieve the above object of the invention, the technical solution used in the present invention is: a kind of aluminum hull lithium ion battery, comprise cap, housing and be contained in the interior both positive and negative polarity pole piece of housing, described cap is provided with two electrode fairleads, be connected with anode electrode hermetically-sealed construction and negative electrode hermetically-sealed construction respectively, described electrode sealing construction comprises brace, pass that battery case covers the rivet of rivet hole setting and at the convex packing ring between battery cap and the rivet be placed in spill packing ring on the rivet, between cap and brace, described cap, housing are aluminum hull; At least one is made of conductive plastics in the spill packing ring of described anode electrode hermetically-sealed construction and the convex packing ring, and the resistance value of conductive plastics is 10 2~10 4Ohm.
Above, convex packing ring or spill packing ring adopt conductive plastics to make, anode electrode and cap conducting have been realized on the one hand, aluminum hull and anodal current potential are consistent, play the effect that prevents that aluminum hull from being corroded by electrolyte, on the other hand, by limiting the resistance of conductive plastics, produce big electric current at positive strap and the housing Shi Buhui that is short-circuited, thereby spark phenomenon can not occur, guaranteed the security performance of battery.The present invention can have three kinds of selections: the one, and spill packing ring and convex packing ring are conductive plastics and constitute; The 2nd, only the spill packing ring is made of conductive plastics, and the convex packing ring can adopt PP material or other common materials; The 3rd, only the convex packing ring is made of conductive plastics; When adopting the second way, cap is direct and brace conducting by the spill packing ring; When adopting the third mode, cap be by convex packing ring, rivet again with the brace conducting; Therefore, only change spill packing ring or convex packing ring into conductive plastics and also can realize positive strap and housing conducting, aluminum hull and anodal current potential are consistent.When the resistance value of conductive plastics is 10 2~10 4During ohm, can play good effect.In addition, described composite conductive plastic is a prior art, can be concave, convex shape packing ring by mixing the back injection mo(u)lding, and this forming process is a prior art.
Optimized technical scheme is, described conductive plastics is the composite material of polyethylene and filler, and described filler is selected from one or more in metal dust, graphite and the conductive black.Adopt polyethylene as the packing ring that raw material is made into, have comparatively suitable softening point, can guarantee that packing ring is indeformable in the heating situation of battery operate as normal, good sealing effectiveness is provided; And when the battery abnormal heating, can serve as gas bleeder valve behind the packing ring softening transform to use, have explosion-proof effect.
Because the employing of technique scheme, compared with prior art, the present invention has following advantage:
1. the housing of aluminum hull lithium ion battery of the present invention and cap all adopt aluminum hull, not only greatly reduce battery cost, have also alleviated the weight of battery itself, are beneficial to its convenient use.
2. the present invention adopts the raw material of conductive plastics as preparation concave, convex shape packing ring, makes anode electrode and cap conducting, and aluminum hull and anodal current potential are consistent, and has prevented that effectively aluminum hull from being corroded by electrolyte, makes lithium ion battery adopt the aluminum hull material to become possibility.
3. concave, convex shape packing ring of the present invention has suitable resistance value, produces big electric current at positive strap and the housing Shi Buhui that is short-circuited, thereby spark phenomenon can not occur, has guaranteed the security performance of battery.
4. but concave, convex shape packing ring single injection-molded of the present invention is processed easyly, with low cost, helps commercial Application.
Description of drawings
Fig. 1 is the structural representation of the invention process row one;
Fig. 2 is an A portion cutaway view Amplified image among Fig. 1.
Wherein: 1, cap; 2, housing; 3, pole piece; 4, brace; 5, rivet; 6, convex packing ring; 7, spill packing ring.
Embodiment
Below in conjunction with embodiment the present invention is further described, but should limit protection scope of the present invention with this:
Embodiment one:
Shown in Fig. 1~2, a kind of aluminum hull lithium ion battery, comprise cap 1, housing 2 and be contained in both positive and negative polarity pole piece 3 in the housing 2, described cap is provided with two electrode fairleads, be connected with anode electrode hermetically-sealed construction and negative electrode hermetically-sealed construction respectively, described electrode sealing construction comprises brace 4, pass the rivet 5 of rivet hole setting on the battery cap 1 and at the convex packing ring 6 between battery cap 1 and the rivet 5 be placed in the spill packing ring 7 between cap 1 and brace 4 on the rivet 5, described cap 1, housing 2 are aluminum hull; The spill packing ring 7 of described anode electrode hermetically-sealed construction is made of conductive plastics, and the resistance value of conductive plastics is 10 2~10 4Ohm.
In the technique scheme, described conductive plastics is the composite material of polyethylene and filler, and described filler is a conductive black.Test spill packing ring resistance value and battery safety, the riveted joint performance under high temperature and drying condition:
26 batteries that present embodiment is installed are tested, testing procedure as:
1, is ready to each parts;
2, parts clean (concave, convex pad, rivet alcohol wash are also dried, cap ultrasonic waves for cleaning and oven dry), cap endoporus point glue (drying), protruding pad impregnation (drying), and utmost point group is gone into the shell punching;
3, riveted joint (stroke---riveted joint back is high: positive pole: 10.2 ± 0.1mm, negative pole: 9.9 ± 0.1mm, air pressure 6.0MPa, time 2.0s 1,2# riveting machine), riveted joint postscript picture recording related parameter (contact resistance, punching torsion, outward appearance);
4, normal no problem is welded in welding (by existing production technology welding);
5, vacuum leak detection (by existing production technology vacuum leak hunting), normal no problem leaks hunting;
6, cartonning drying (by existing production technology drying);
7, torsion is surveyed in dry back, torsion no recessed pad cracking ruckbildung up to standard;
8, fluid injection is (by existing production technology, reservoir quantity 44.5 ± 1g);
9, change into (once changing into), vacuumize after the end and fill protection gas;
10, spot welding, seal;
11, continuing secondary changes into and subsequent job;
12, the lead with 6m Ω directly is communicated with negative pole brace and housing, tests its security performance;
13, test electrode riveted joint performance and outward appearance under high temperature (85 ℃~95 ℃).
Conclusion is:
When 1, directly being communicated with negative pole brace and housing with lead, electric core is not struck sparks, and circulation recurve pad and lug are all no abnormal;
2, punching torsion is qualified during high temperature, and recessed pad does not have cracking phenomena;
3, dry back punching torsion is qualified, and recessed pad does not have softening cracking phenomena.
Embodiment two:
A kind of aluminum hull lithium ion battery, comprise cap, housing and be contained in the interior both positive and negative polarity pole piece of housing, described cap is provided with two electrode fairleads, be connected with anode electrode hermetically-sealed construction and negative electrode hermetically-sealed construction respectively, described electrode sealing construction comprises brace, pass that battery case covers the rivet of rivet hole setting and at the convex packing ring between battery cap and the rivet be placed in spill packing ring on the rivet, between cap and brace, described cap, housing are aluminum hull; The spill packing ring and the convex packing ring of described anode electrode hermetically-sealed construction constitute by conductive plastics, and the resistance value of conductive plastics is 10 2~10 4Ohm.Described conductive plastics is the composite material of polyethylene and filler, and described filler is a graphite.
Embodiment three:
A kind of aluminum hull lithium ion battery, comprise cap, housing and be contained in the interior both positive and negative polarity pole piece of housing, described cap is provided with two electrode fairleads, be connected with anode electrode hermetically-sealed construction and negative electrode hermetically-sealed construction respectively, described electrode sealing construction comprises brace, pass that battery case covers the rivet of rivet hole setting and at the convex packing ring between battery cap and the rivet be placed in spill packing ring on the rivet, between cap and brace, described cap, housing are aluminum hull; The convex packing ring of described anode electrode hermetically-sealed construction is made of conductive plastics, and the resistance value of conductive plastics is 10 2~10 4Ohm.Described conductive plastics is the composite material of polyethylene and filler, and described filler is a metal dust.

Claims (2)

1. aluminum hull lithium ion battery, comprise cap (1), housing (2) and be contained in both positive and negative polarity pole piece (3) in the housing (2), described cap is provided with two electrode fairleads, be connected with anode electrode hermetically-sealed construction and negative electrode hermetically-sealed construction respectively, described electrode sealing construction comprises brace (4), be arranged at battery cap (1) and go up rivet hole, pass the rivet (5) of rivet hole and be positioned at battery cap (1) and rivet (5) between convex packing ring (6) and be placed on the rivet (5), be positioned at the spill packing ring (7) between cap (1) and the brace (4), it is characterized in that: described cap (1), housing (2) is aluminum hull; At least one is made of conductive plastics in the spill packing ring (7) of described anode electrode hermetically-sealed construction and the convex packing ring (6), and the resistance value of conductive plastics is 10 2~10 4Ohm.
2. aluminum hull lithium ion battery according to claim 1 is characterized in that: described conductive plastics is the composite material of polyethylene and filler, and described filler is selected from one or more in metal dust, graphite and the conductive black.
CN200810124637A 2008-08-20 2008-08-20 Lithium ion battery with aluminum case Active CN100592566C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200810124637A CN100592566C (en) 2008-08-20 2008-08-20 Lithium ion battery with aluminum case

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200810124637A CN100592566C (en) 2008-08-20 2008-08-20 Lithium ion battery with aluminum case

Publications (2)

Publication Number Publication Date
CN101345293A CN101345293A (en) 2009-01-14
CN100592566C true CN100592566C (en) 2010-02-24

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102394280B (en) * 2011-12-05 2014-03-19 上海航天电源技术有限责任公司 Aluminum casing lithium ion battery with corrosion resistant protection apparatus
KR20140096197A (en) * 2013-01-10 2014-08-05 삼성에스디아이 주식회사 Battery pack
CN103208595B (en) * 2013-03-25 2017-02-08 东莞新能源科技有限公司 Top cover for aluminum-case power batteries
KR20170025117A (en) * 2015-08-27 2017-03-08 삼성에스디아이 주식회사 Rechargeable battery
CN106128667B (en) * 2016-08-10 2019-09-03 东莞永蓝电子科技有限公司 Power battery top cover combined resistance
CN108695451B (en) * 2017-04-07 2021-02-09 宁德时代新能源科技股份有限公司 Secondary cell's top cap subassembly and secondary cell

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Address after: 215153 Suzhou high tech Zone, Jiangsu city science and technology, Jinsha River Road, No. 181

Patentee after: Phylion battery Limited by Share Ltd

Address before: 215123 Xiangyang Road, Suzhou New District, Jiangsu, Suzhou, China, No. 81

Patentee before: Suzhou Phylion Battery Co., Ltd.