CN201243063Y

CN201243063Y - Cylindrical flexible package lithium ion battery

Info

Publication number: CN201243063Y
Application number: CNU2007200982640U
Authority: CN
Inventors: 于锟; 刘振双
Original assignee: TIANJIN HANGLIYUAN TECHNOLOGY Co Ltd
Current assignee: TIANJIN HANGLIYUAN TECHNOLOGY Co Ltd
Priority date: 2007-12-03
Filing date: 2007-12-03
Publication date: 2009-05-20
Anticipated expiration: 2017-12-03

Abstract

The utility model provides a cylindrical flexible-packed lithium-ion battery; the battery structure comprises a polar core sleeve; perforated plates are respectively arranged at both ends of the polar core sleeve; perforated plate positioning slots are symmetrically arranged at the circumference of each perforated plate; a polar core sleeve positioning block is arranged at the center of each perforated plate; a battery polar core is arranged in the polar core sleeve; both ends of the battery polar core are connected with a plurality of current collecting strips and output terminals; the outer layer of the polar core sleeve is enwrapped with composite aluminum plastic film; the outer layer of the polar core sleeve is enwrapped with cylindrical composite aluminum plastic film; and both ends of the cylindrical composite aluminum plastic film and both ends of the polar core sleeve are sealed to form horizontal seal edges. The utility model has the advantages that the structure enables the cylindrical lithium-ion battery to be packed with flexible material to achieve high accuracy and consistency of the overall dimension; therefore, the structure can effectively prevent damage to the battery polar core and the composite aluminum plastic film at the outer layer to support the outer layer packaging film inside the battery. As the injection mold is low in cost which only accounts for about 1/10 of that of a stainless steel shell, the production of cylindrical flexible-packed battery is possible.

Description

Cylindrical flexible packing lithium ion battery

Technical field

The utility model relates to a kind of battery, particularly a kind of cylindrical flexible packing lithium ion battery.

Background technology

Column lithium ion battery all adopts stainless steel casing to carry out packaging seal at present, adopt this kind battery case cell safety coefficient low, because the safety problem of lithium ion battery is mainly owing to produce gases at high pressure untimely the causing of releasing after the inside battery substance decomposition, the air releasing device of cylindrical stainless steel casing battery has two kinds at present, the low capacity cylindrical battery, as cells in notebook computer, adopt battery case and battery cap mechanical crimp to seal, reach the purpose of the gas of releasing by the mode that in battery cap, installs the sheet metal that has indentation additional, when inside battery air pressure is elevated to the certain pressure value, battery loses heart after breaking in the indentation place of sheet metal, fracture pressure is to control by the degree of depth of sheet metal indentation, be subjected to the influence of sheet metal material and indentation precision very big, therefore the fracture pressure control precision is very low, the situation that fracture pressure is not broken often appears arriving in sheet metal, cause battery because of having little time to discharge the gases at high pressure explosive combustion, the stainless steel material of shell has increased the destructiveness that blast causes again greatly, lethality is huge, and the blast of cells in notebook computer is exactly due to this reason.Big capacity cylindrical battery (as batteries of electric automobile) then adopts the form of battery cover and battery case welded seal, the metal material of battery shell wall and battery cover is thicker, usually adopt and on battery cover, open diameter 3mm-5mm circular hole, the mode that thin polymer film or tinfoil film are installed in the circular hole place then reaches the purpose of the gas of releasing, film thickness is generally 0.1mm-0.2mm, this kind mode is the strength control fracture pressure that relies on breakable, be subjected to the influence of film thickness bigger, the situation that film just breaks when often occurring not reaching fracture pressure, voltage endurance capability is very poor, thereby and this film be that soft material is subjected to the external force cracking easily and causes inside battery electrolyte to reveal to cause battery failure to scrap.

Rectangular lithium ion battery is because adopted soft package technology successfully to solve the problems referred to above, the pressure and temperature that outside composite aluminium plastic thin-film material can bear is certain, when excessive or temperature is too high when cell internal pressure, the external packing meeting is out of shape thereupon, is broken, can effectively prevent the potential safety hazard of battery, and soft material does not have destructiveness, the safety problem of effective battery of alleviating.The battery of different-energy system can adopt the aluminum plastic film of different-thickness, small-capacity cells can adopt the less aluminum plastic film of thickness, high capacity cell can adopt the bigger aluminum plastic film of thickness, it is convenient to use, and can design cells into different shapes as required, be not subjected to the restriction of stainless steel casing fixed structure.

The rectangular cell soft package technology of above-mentioned maturation is not applied on cylindrical battery always; reason is that cylindrical battery is to rely on outside stainless steel casing to keep its cylindrical shape; if directly adopting aluminum plastic film packs; battery is with different; and inside battery electricity core can not get protection, so the feasibility of technological forming is very little.

Summary of the invention

In order to address the above problem, the utility model provides a kind of cylindrical flexible packing lithium ion battery, by the effect of reasonable structural design servicing unit, make the battery soft package technology in the cylindrical battery application of succeeding, effectively solve the safety problem of column lithium ion battery.

For achieving the above object, technical solution of the present utility model provides a kind of cylindrical flexible packing lithium ion battery, this lithium ion battery structure includes the pole piece sleeve of a non-metallic material, be respectively equipped with an orifice plate at the two ends of pole piece sleeve, circumference at orifice plate is arranged with the orifice plate location notch, center at orifice plate is provided with liquid injection hole, the main body of Battery Pole Core for this battery is housed in the pole piece sleeve, be connected with many collector bar at the two ends of Battery Pole Core, and many collector bar are drawn by the collector bar leadout hole that is located on the orifice plate, and the connection lead-out terminal carries out the output and the input of electric current, the clad aluminum plastic film that vertical edge sealing is arranged in advance at the skin parcel of pole piece sleeve, vertically leaving exhaust outlet on the edge sealing, at the two ends and the horizontal edge sealing of lead-out terminal sealing formation of clad aluminum plastic film.

Effect of the present utility model is that this structure can make column lithium ion battery adopt soft material to pack, and solved the problem that cylindrical battery can not adopt flexible package.The sleeve of this structure and orifice plate be by injection mo(u)lding, the high high conformity of overall dimension precision; Superficiality is good, can effectively prevent to damage Battery Pole Core and outer plastic-aluminum combined film in the battery assembling process.The injection mold expense is low, is about 5000 yuan, produces this die cost in enormous quantities and can ignore.Play the effect of supporting the outer packaging film at inside battery, protected Battery Pole Core not to be subjected to external force simultaneously, material can adopt materials such as polypropylene, polyethylene and poly-tetrafluoro, and cheap, in liberal supply, cost is about 1/10th of stainless steel casing.Can produce cylindrical flexible package finished product battery in batches by application of the present utility model, this battery structure has played the effect that the protection Battery Pole Core is not subjected to external force and cell integrated shaping, makes the soft package technology application of succeeding in cylindrical battery manufacturing field.

Description of drawings

Fig. 1 is a battery front view of the present utility model;

Fig. 2 is the curling profile schematic diagram of the clad aluminum plastic film of the utility model battery;

Fig. 3 is the orifice plate schematic diagram of the utility model battery;

Fig. 4 is the pole piece sleeve schematic diagram of the utility model battery;

Fig. 5 is the Battery Pole Core schematic diagram of the utility model battery;

Fig. 6 is the lead-out terminal schematic diagram of the utility model battery.

Among the figure:

1, orifice plate 2, orifice plate location notch 3, collector bar leadout hole

4, liquid injection hole 5, pole piece sleeve 6, pole piece sleeve locating piece

7, Battery Pole Core 8, collector bar 9, lead-out terminal

10, clad aluminum plastic film 11, vertical edge sealing 12, exhaust outlet

13, horizontal edge sealing 14, finished product battery

Embodiment

Reaching embodiment in conjunction with the accompanying drawings is illustrated cylindrical flexible packing lithium ion battery structure of the present utility model.

Shown in Fig. 1-6, cylindrical flexible packing lithium ion battery structure of the present utility model is the pole piece sleeve 5 that this lithium ion battery structure includes a non-metallic material, be provided with locating piece 6 at the two ends of pole piece sleeve 5, an orifice plate 1 is installed respectively, circumference at orifice plate 1 is arranged with orifice plate location notch 2, be provided with liquid injection hole 4 at the center of orifice plate 1, Battery Pole Core 7 is housed in pole piece sleeve 5 is the main body of this battery, be connected with many collector bar 8 at the two ends of Battery Pole Core 7, and many collector bar 8 are drawn by the collector bar leadout hole 3 that is located on the orifice plate 1, and connection lead-out terminal 9 carries out the output and the input of electric current, skin at pole piece sleeve 5 is enclosed with cylindrical shape clad aluminum plastic film 10, with the two ends of cylindrical shape clad aluminum plastic film 10 and the horizontal edge sealing 13 of sealed at both ends formation of pole piece sleeve 5, form moulding battery 14.

Battery Pole Core 7 is main parts of lithium ion battery, it is the device that electric energy and chemical energy are changed mutually, therefore it needs good reaction environment in the charge and discharge process of battery, be not subjected to damage and fixed in shape etc., pole piece sleeve 5 and orifice plate 1 well play this effect, need lead-out terminal 9 to carry out the output and the input of electric current as the connector of battery inside and outside simultaneously, therefore on orifice plate 1, open the passage of collector bar leadout hole 3 as lead-out terminal 9, for satisfying the needs of lead-out terminal 9 diverse locations, many collector bar 8 are drawn so leave collector bar leadout hole 3 in a plurality of positions.Under the mating reaction of orifice plate location notch 2 and pole piece sleeve locating piece 6; orifice plate 1 and pole piece sleeve 5 provide good structure for battery; when outer packaging clad aluminum plastic film 10, Battery Pole Core 7 is well protected, and injects electrolyte by liquid injection hole 4 in battery then.Packing back battery structure is fixed, and good looking appearance adopts nonmetallic materials simultaneously, greatly reduces the destructiveness of battery, has improved the fail safe of battery.

This cylindrical flexible packing lithium ion battery structure is achieved in that

With the Battery Pole Core 7 that the is wound into pole piece sleeve 5 of packing into; Collector bar 8 is passed orifice plate 1 by collector bar leadout hole 3, and the orifice plate location notch 2 and the pole piece sleeve locating piece 6 of orifice plate 1 and pole piece sleeve 5 closed the tightening position mutually; Collector bar 8 and lead-out terminal 9 are welded, form the electrode group, the electrode group is carried out low temperature drying, stand-by; Adopt the mode of heat seal that clad aluminum plastic film 10 is made into cylindrical shape, drum diameter is bigger than pole piece sleeve 5; Electrode after the oven dry is assembled in clad aluminum plastic film 10 cylinders, with an end and the horizontal edge sealing 13 of lead-out terminal 9 heat seals sealing formation of cylinder; Inject a certain amount of electrolyte by liquid injection hole 4 to inside; Integral body is inserted in the vacuum plant, when vacuum degree reaches certain value, carried out heat sealing.Carry out first charge-discharge by battery after the above production process, the gas of generation is discharged from exhaust outlet 12; Gas is inserted battery in the vacuum plant after discharging again, with exhaust outlet 12 heat seals sealing, forms finished product battery 14 at last under certain vacuum degree.

By above cylindrical flexible packing lithium ion battery structure of the present utility model, make the soft package technology application of succeeding in cylindrical battery manufacturing field.

Polypropylene material is adopted in cylindrical flexible packing lithium ion battery structural member orifice plate 1 of the present utility model and 5 designs of pole piece sleeve, by the moulding of injection moulding mode, and the high high conformity of overall dimension precision; Superficiality is good, can effectively prevent to damage Battery Pole Core and outer plastic-aluminum combined film in the battery assembling process.This kind material good corrosion resistance with the electrolyte generation chemical reaction of battery, does not have certain structure intensity, helps protecting Battery Pole Core, and is simultaneously cheap, is applicable to high volume applications.This kind structure is suitable for producing diameter 10mm～500mm, the flexible package column lithium ion battery of length 10mm～1000mm.

Claims

1, a kind of cylindrical flexible packing lithium ion battery, it is characterized in that: this lithium ion battery structure includes the pole piece sleeve (5) of a non-metallic material, be respectively equipped with an orifice plate (1) at the two ends of pole piece sleeve (5), circumference at orifice plate (1) is arranged with orifice plate location notch (2), be provided with liquid injection hole (4) at the center of orifice plate 1, pole piece sleeve two ends are provided with locating piece (6), the main body that this battery is housed in pole piece sleeve (5) is Battery Pole Core (7), be connected with many collector bar (8) at the two ends of Battery Pole Core (7), and many collector bar (8) are drawn by the collector bar leadout hole (3) that is located on the orifice plate (1), and connection lead-out terminal (9) carries out the output and the input of electric current, the clad aluminum plastic film (10) that vertical edge sealing (11) is arranged in advance at the skin parcel of pole piece sleeve (5), vertically leaving exhaust outlet (12) on the edge sealing (11), at the two ends and lead-out terminal (9) the sealing formation horizontal edge sealing (13) of clad aluminum plastic film (10).

2, cylindrical flexible packing lithium ion battery according to claim 1 is characterized in that: described clad aluminum plastic film (10) is a drum.