CN203367373U

CN203367373U - Casing of cylindrical capacitive type lithium ion battery

Info

Publication number: CN203367373U
Application number: CN2013204789440U
Authority: CN
Inventors: 戴伟军
Original assignee: ZHOUSHAN XINLONG ELECTRONICS CO Ltd
Current assignee: ZHOUSHAN XINLONG ELECTRONICS CO Ltd
Priority date: 2013-08-07
Filing date: 2013-08-07
Publication date: 2013-12-25
Anticipated expiration: 2023-08-07

Abstract

The utility model provides a casing (1) of a cylindrical capacitive type lithium ion battery. The casing comprises a cylindrical aluminum casing (12) and insulation layers arranged on the inner wall and the outer wall of the aluminum casing and is formed by coating two sides of an aluminum plate with a polyurethane coating and hot-curing and stamping the aluminum plate, wherein the thickness of an insulation layer (11) on the outer wall of the aluminum casing is 7-12 mu m, and the thickness of an insulation layer (13) on the inner wall of the aluminum casing is 10-15 mu m; and the adhesive strength between the insulation layers and the aluminum casing is more than 45 centipoises, the elongation percentage of the insulation layers is more than 400%, and the withstand voltage AC of the insulation layers is more than 440 V. Compared with the prior art, the insulation layers arranged on the inner wall and the outer wall of the aluminum casing are uniform in thickness, thin and high in insulation property, and at the same time, the adhesive strength is higher; the elongation of the insulation layers is better, so that the long diameter of the batter casing is long, and the diameter is smaller; and the volume of the battery with the same capacitance can be smaller by the aid of the high withstand voltage property, and the yield can be improved by the aid of the high adhesive strength.

Description

The housing of cylindrical capacitor type lithium ion battery

Technical field

The utility model relates to a kind of housing of cylindrical capacitor type lithium ion battery.

Background technology

The capacitor type lithium ion battery is a kind of high-capacity battery that combines ultracapacitor and lithium ion battery, the de-embedding chemical energy storage principle of the electric double layer physics energy storage principle that it had not only comprised capacitor but also the embedding that comprises lithium ion battery.Because the capacitor type lithium ion battery combines the advantage of ultracapacitor and lithium ion battery, there is the distinguishing feature such as have extended cycle life, power density is large, the charging fast, internal resistance is low, thermal adaptability is wide in range, security performance is good, and become the upgraded product of lithium battery.The capacitor type lithium ion battery adopts unidirectional bipolar the drawing of capacitor type, and the aluminum hull inwall need insulate in case internal short-circuit, and existing what extensively adopt is the paper cover thick at aluminum hull liner 0.1mm, the thick PVC sleeve pipe at aluminum hull overcoat 0.13mm.Cause like this complex process, volume lowering, the use of PVC is unfavorable to environmental protection simultaneously.

Chinese invention patent application " a kind of method of manufacturing aluminium electrolytic capacitor lithium battery insulating environment-friendly aluminum hull " (application publication number CN102983292), its disclosed technical scheme is: " in using electric field, first by polyacrylamide resin and polyurethane kind synthetic material particle, after additive adds solution, be placed in container by solution and pass to electric current, to be placed in solution by the coating workpiece, and pass to electric current, when the solution making current is negative pole, connected positive pole by the coating workpiece, otherwise, the bipolarity electric current is exchanged, the material particle that uses the polarity dissimilar charges to be subject to charged ion under the active force of electric field can move to and be attached the thing table and adhered to, the intensity of electric field is larger, the rate travel of charged ion suspension material particle is faster, adhere to speed also faster, therefore, this coating method of mat, there is directly quick coating workpiece shell and tube inner surface dielectric film." this is that a kind of housing making that completes cylindrical capacitor type lithium ion battery covers the technical scheme of one deck polyacrylamide resin and polyurethane kind synthetic material dielectric film within it by electrophoresis.

In addition, sprayed the polyester coating post-drying after using in addition shell to make, and adopted after the film brush coatings such as nylon, PET the method for punching after two-sided multiple film thermosetting on sheet material.Adopt electrochemical process also can form the oxidation insulating layer of counting to over one hundred micron thick, but, because of the hard fragility of oxide layer, can peel off during for the product frock, generally be not used in the aluminium shell of capacitor that needs waisting and sealing operation.

Above-mentioned three kinds of methods that form insulating barrier inside and outside aluminum hull can be called electrophoresis, spraying process and multiple embrane method.Electrophoresis is adapted at metal material surface and coats insulating barrier, but at the aluminum hull inwall because of anode shield, coating can't be reliably heavy attached at inwall, also can only reach 1/2 of appearance thickness after adopting strengthening measure, and inhomogeneous, positive electrode position, without coating, can not meet shell inwall insulating requirements.Spraying process is applicable to the external coating of various materials, but can't make equally the reliable uniform insulation layer of the inner acquisition of shell, and easily produces salivation, can not meet aluminum hull inside and outside wall insulating requirements.Multiple embrane method has been applied in high-end capacitor product, but air sandwiches problem and solves fully during because of multiple film, easily produces broken hole during the product frock, and has no two-sided membrane process and product again both at home and abroad, can't meet the requirement of the two-sided reliable insulation of housing.As mentioned above, the insulating barrier that above each method obtains has holiday, come off or distortion etc. affects the deficiency of its electrical property or outward appearance, and this area research, test in the past few years all produces no breakthroughs.

Summary of the invention

For above-mentioned deficiency, the utility model is exactly to provide a kind of insulating barrier the even firmly housing of cylindrical capacitor type lithium ion battery.

The housing of cylindrical capacitor type lithium ion battery provided by the invention, insulating barrier on cylindrical aluminum hull and aluminum hull inside and outside wall is arranged, by being stamped to form after the hot curing of aluminium sheet two sided coatings polyurethane paint, wherein on outer wall, insulating layer thickness is 7-12 μ m, on inwall, insulating layer thickness is 10-15 μ m, more than adhesive strength 45 centipoises between insulating barrier and aluminum hull, the insulating barrier elongation is more than 400%, more than the withstand voltage AC440V of insulating barrier.

The housing of the cylindrical capacitor type lithium ion battery that the utility model provides, with the rubbing method manufacture, on aluminum hull on inside and outside wall thickness of insulating layer even, thin and insulating properties is high, higher adhesive strength is arranged simultaneously, thickness, adhesive strength, elongation and the withstand voltage index of insulating barrier are all reached and the requirement on following process of the housing that surpassed cylindrical capacitor type lithium ion battery and housing in the requirement of battery.Compared with prior art, owing to better extensibility being arranged and first be coated with aftershaping, can avoid inwall to form the obstacle of insulating barrier, the present invention can make that the draw ratio of battery container is larger, diameter is less.And the raising of withstand voltage properties, make the volume of the battery of same capacitance can be less or capacity increase.The raising of adhesive strength can keep the complete of insulating barrier when waisting seals, and improves rate of finished products.The polyurethane coating adhesive strength reaches ten times with hundred lattice method tests and does not come off, and is greater than adeciduate technological requirement three times.

The accompanying drawing explanation

The structure chart that Fig. 1 is one embodiment of the invention, the enlarged drawing that Fig. 2 is regional I in Fig. 1, in figure: 1-housing, 2-core body, 3-capping, 4-electrode, insulating barrier on the 11-outer wall, 12-aluminum hull, insulating barrier on the 13-inwall.

Embodiment

A kind of housing of cylindrical capacitor type lithium ion battery, adopt the aluminium sheet that the trade mark is 3003,3104, their Vickers hardness 45-50.First on the aluminium sheet two sides, coat polyurethane paint, coating solid content 45-50% during coating, wet-film thickness 20-25 μ m, specifically controlling thickness on the dry film outer wall is 7-12 μ m, on inwall, thickness is 10-15 μ m.Hot curing after coating.Adopt the bowl-type blanking of first road after application, after with continuous 7 road distorted pattern stretch formings, the draw ratio of the housing of gained capacitor type lithium ion battery is 4.3 ︰ 1.Housing 1 is comprised of insulating barrier 13 on insulating barrier 11, inwall on aluminum hull 12 and outer wall.Wherein on outer wall more than the withstand voltage AC 600V of insulating barrier, on inwall, more than the withstand voltage AC 500V of insulating barrier, relative 3.7 inner pressure of battery can effectively insulate.More than adhesive strength 45 centipoises between insulating barrier and aluminum hull.Core body 2 is installed in housing, and core body is arranged in housing and extraction electrode 4 therefrom through capping 3 sealings, forms unidirectional bipolar capacitor type lithium ion battery.

Claims

1. the housing of a cylindrical capacitor type lithium ion battery, insulating barrier on cylindrical aluminum hull and aluminum hull inside and outside wall is arranged, it is characterized in that by being stamped to form after the hot curing of aluminium sheet two sided coatings polyurethane paint, wherein on outer wall, insulating layer thickness is 7-12 μ m, on inwall, insulating layer thickness is 10-15 μ m, more than adhesive strength 45 centipoises between insulating barrier and aluminum hull, the insulating barrier elongation is more than 400%, more than the withstand voltage AC440V of insulating barrier.