CN101022176A - Assembling technology for lithium ion battery roll core after packaging the bottom - Google Patents

Abstract

This invention relates to an assembly technology after packing the bottom of a rolled core of a Li ionic cell characterizing: 1, wrapping an adhesive tape to the bottom of a rolled core by the book, 2, adding a pad to be fixed, 3, pre-shaping to a positive pole ear, 4, welding the cell cover, 5, welding the positive pole ear, 6, shaping the cover to 90deg., 7, lifting the negative pole ear, 8, pressing the cover and rolling the core, 9, putting the entire rolled-core in the shell, 10, welding the surroundings of the shell and the cover after the core enters into the shell to finish the fitting.

Description

Lithium ion battery coil core is wrapped the assembly technology behind the bottom

Technical field

The present invention relates to a kind of assembly technology of lithium ion battery, particularly a kind of lithium ion battery coil core is wrapped the assembly technology behind the bottom.

Background technology

Sony corporation of Japan and Sanyo were respectively at 1985 and beginning lithium rechargeable battery practical research in 1988.Great interest and enthusiasm are all revealed to the application table of lithium rechargeable battery at aspects such as communication field, portable type electronic product, electric motor car and Aero-Space in countries in the world, and have carried out continuous exploration and improvement at performance, the particularly manufacturing process of exploitation lithium rechargeable battery.

At present, in the lithium ion battery production process, according to its technological requirement, the assembling technology procedure basic procedure comprises that coiling-volume core of rolling up core flattens operations such as shaping-volume core bag primer band-core winding into shell-placement Upper gasket-negative electrode lug and battery cover welding-anode ear welding-lug shaping-buckle closure.

Go into operations such as placement, negative electrode lug and the battery cover welding of carrying out Upper gasket behind the shell, anode ear welding, lug shaping, buckle closure in the common assembly technology earlier, have only two kinds of selections, the one, at first with core winding into shell and make volume core top be lower than faucal one segment distance (about 1mm), Upper gasket could be placed in the battery case like this, be convenient follow-up buckle closure, lug just need be than other situation more than the long 1mm, but because lug is long, cause in processes such as lug bending shaping, easily produce lug and be rebuffed, cause short circuit.The 2nd, for short lug, core winding into shell can not be too dark, when carrying out other operation work, needs to carry out with hand steered.But all there is a problem in these two kinds of technological operations, promptly cause the fold of volume in-core portion Copper Foil, because this dual mode battery cover and volume core do not compress, in the gland process, the strength of gland can be walked downward along negative electrode lug, and volume core and internal surface of battery shell exist the effect of frictional force, the speed of decline to be lower than the speed that negative electrode lug descends, in the middle of so just causing and fixedly the downward fold of Copper Foil of negative electrode lug.Inner thickness increases, and produces safety problem when serious.

Along with battery capacity requires more and more higher, the size of volume core is increasing with the ratio of housing inner cavity size, the length requirement of lug, particularly negative electrode lug shortens, and makes like this to finish the increasing of difficulty into assembling processes such as shells according to the existing processes flow process, thereby causes defective products to increase.Problems such as particularly the lug shaping is bad, lug rebuffed, inside battery fold.In this case, need further optimize the assembly technology of battery, the performance that improves constantly product has become the new problem that this field scientific research personnel is badly in need of researching and developing to meet the need of market.

Summary of the invention

The objective of the invention is to overcome above-mentioned weak point, the assembly technology after lithium ion battery coil core a kind of optimization, that effectively improve the quality of products is wrapped the bottom is provided.

The technical solution adopted in the present invention is for achieving the above object: a kind of lithium ion battery coil core is wrapped the assembly technology behind the bottom, it is characterized in that concrete implementation step is as follows:

(1) carries out battery roll core bag bottom adhesive tape routinely;

(2) add Upper gasket and fixing;

(3) carry out the pre-shaping of anode ear;

(4) weldering battery cover;

(5) weldering anode ear;

(6) carry out battery cover 90 degree shapings;

(7) lug shaping before the gland

(8) press battery cover and volume core;

(9) volume core integral body is gone into shell;

(10) roll up core integral body routinely and go into battery case periphery welding behind the shell, finish the battery assembling.

The invention has the beneficial effects as follows: the main distinction of the present invention and existing assembly technology is to change the precedence that volume core integral body is gone into shell, and existing technology will roll up core integral body and be gone into shell earlier, the interior limited space constraints of housing finishing of subsequent operation technology; The present invention has been because battery cover has been stablized position and shape with the volume core before going into shell, the problem of the faucal drum that produces in the buckle closure process that can avoid existing technological process processing ease to cause, thus can effectively improve the yields of follow-up periphery welding.According to this technological process assembling, operate standard criterion more; Can avoid effectively that the lug shaping is bad in the battery assembling process, pole piece weighs wounded, roll up various bad phenomenon such as in-core portion fold, guarantee that properties of product are more safe and reliable.

Description of drawings

Fig. 1 is the invention process flow chart of steps.

Fig. 2 is the battery structure schematic diagram that the present invention finishes volume core flattening shaping operating procedure correspondence;

Among the figure: the volume core after the flattening shaping, promptly wrapped primer band 1.

Fig. 3 is that the present invention finishes the battery structure schematic diagram that adds Upper gasket and fixing operation step correspondence;

Among the figure: put the volume core of Upper gasket 2 well, it is fixing to have used spacers adhesive tape 7.

Fig. 4 a is the battery structure schematic diagram that the present invention finishes the pre-shaping operating procedure of lug correspondence;

Fig. 4 b is Fig. 4 a side schematic view;

Among the figure: anode ear 3 bendings.

Fig. 5 is the battery structure schematic diagram that the present invention finishes weldering battery cover operating procedure correspondence;

Among the figure: battery cover 4 and negative electrode lug 5 and anode ear 3 welding.

Fig. 6 a is the battery structure schematic diagram that the present invention carries out battery cover 90 degree shaping operating procedure correspondences;

Fig. 6 b is Fig. 6 a side schematic view;

Among the figure: 90 degree bendings of battery cover 4.

Fig. 7 a is the battery structure schematic diagram that the present invention finishes the preceding lug shaping operating procedure correspondence of gland;

Fig. 7 b is Fig. 7 a side schematic view.

Fig. 8 a is that the present invention finishes the battery structure end view that compresses battery cover and volume core operating procedure correspondence;

Fig. 8 b is Fig. 8 a side schematic view;

The local A of Fig. 8 c Fig. 8 b place enlarged diagram;

Among the figure: battery cover 4 compresses with the volume core.

Fig. 9 a is that the present invention finishes the battery structure schematic diagram that volume core integral body is gone into shell operating procedure one correspondence;

Fig. 9 b is that the present invention finishes the battery structure schematic diagram that volume core integral body is gone into shell operating procedure two correspondences;

Among the figure: volume core (pressing battery cover 4) is gone into battery container 6.

Number in the figure: 1 primer band, 2 Upper gaskets, 3 anode ears, 4 battery covers, 5 negative electrodes, 6 battery containers, 7 Upper gasket fixation adhesive tapes.

Embodiment

Below in conjunction with accompanying drawing and preferred embodiment, to according to embodiment provided by the invention, structure, details are as follows for feature:

Shown in Fig. 1-Fig. 9 b, a kind of lithium ion battery coil core is wrapped the assembly technology behind the bottom, it is characterized in that concrete implementation step is as follows:

(1) carries out battery roll core routinely and flatten shaping;

It is that claimed adhesive tape parcel is closely knit evenly through after the flattening shaping and at its bottom parcel protective tapes that this operation requires the volume core, and the outside perk in two ends will remain in the 0.5mm.

(2) add Upper gasket and fixing;

This operation is to have added Upper gasket on the volume core top of the good bottom of parcel adhesive tape; after Upper gasket is first-class; fix with narrow protective tapes on one side at it; this protective tapes is that both sides are fixed; Upper gasket is after volume core top is fixing; in follow-up multiple tracks assembly process, can keep stable; rocking about about can not occurring; avoid existing technological operation unfixing because of Upper gasket; in the bending of weldering battery cover, loam cake, go in the process such as shell to occur hindering, twist positive and negative lug, get stuck; even appear at the periphery welding after between lid and shell, cause welding waste product etc.

(3) carry out the pre-shaping of lug;

This operation is carried out the pre-shaping of anode ear, as shown in Figure 3, makes anode ear top close to the skew of volume core central upper portion, and near parallel with negative electrode lug, distance remains on about 0.5mm.Main effect: (1) since positive and negative two lugs near with on a plane, be convenient to the welding of battery cover and positive and negative lug like this, avoid occurring battery cover after positive and negative two lugs welding is finished, on have a down dip or front and back are distorted.(2) after two lugs of volume core welding are finished, anode ear has formed a bending between battery cover and volume core, in battery 90 degree bendings and the gland process " elasticity " surplus is arranged follow-up carrying out like this, avoids occurring the situation of anode ear fracture.

(4) weldering battery cover;

The weldering battery cover adopts electric resistance welding welding negative electrode lug, and normal intensity requires welding routinely, keeps the battery cover correct position.

(5) weldering anode ear;

Ultrasonic wave welds together pre-orthopedic anode ear and battery cover, and normal intensity requires welding routinely.

(6) carry out battery cover 90 degree shapings;

Carry out the shapings of battery cover 90 degree, turn 90 degrees having welded on the volume core of battery cover battery cover turned over, the upset back guarantees positive and negative lug non-cracking, and battery cover keeps level.The negative electrode lug folding edge is littler than the edge of battery cover, avoids occurring situations such as short circuit.Battery cover is after 90 degree upsets, be parallel to volume core top from becoming perpendicular to volume core top, space between battery cover and volume core top will be strengthened like this, under volume core lug requires than short situation at present, reserve the space of operations such as the follow-up shaping of convenience, gland action.

(7) negative electrode lug shaping;

Lug shaping before the gland: this operation mainly is the requirement according to reality, battery cover turned over turn 90 degrees after, positive and negative two lug shapings are finished.Require the battery cover and the Upper gasket on volume core top to compress after the shaping.The purpose of shaping is before compressing battery cover, put in order out the path that needs after two lugs compress, shape criteriaization when making gland, two lugs can not occur like this when compressing battery cover and volume core twists to all directions, thereby avoid occurring the rebuffed short circuit of negative electrode lug, the random many bendings song of positive and negative lug, guarantee the good result of gland, effectively stop one of positive and negative lug or all expose the waste product of gland that battery cover causes and welding.

(8) compress battery cover and volume core;

Battery cover and volume core are compressed, because the present invention rolls up core and does not also go into shell when carrying out this procedure, therefore in the process that compresses owing to there is not the obstruction of battery case, battery cover can extraordinaryly be pressed together with the volume core, and inner positive and negative lug can rule compress, shown in Fig. 8 cA place amplification.

(9) volume core integral body is gone into shell;

Volume core integral body is gone into shell: the volume core that battery cover has compressed is put into battery case.Because the battery cover of the parts of battery assembling such as Upper gasket, the welding of positive and negative lug etc. has all been finished, and therefore goes into shell with very well, also need not to carry out again other operating procedure after going into shell.

(10) roll up core integral body routinely and go into the battery case behind the shell and the periphery welding of battery cover, finish the battery assembling.

Above-mentionedly lithium ion battery coil core is wrapped the assembly technology detailed description of carrying out behind the bottom with reference to embodiment; be illustrative rather than determinate; can make the product of various specification according to this technology; therefore in the variation and the modification that do not break away under the general plotting of the present invention, should belong within protection scope of the present invention.

Claims (1)

1, the assembly technology after bottom a kind of lithium ion battery coil core is wrapped is characterized in that concrete implementation step is as follows:

(1) carries out battery roll core bag bottom adhesive tape routinely;

(2) add Upper gasket and fixing;

(3) carry out the pre-shaping of anode ear;

(4) weldering battery cover;

(5) weldering anode ear;

(6) carry out battery cover 90 degree shapings;

(7) lug shaping before the gland

(8) press battery cover and volume core;

(9) volume core integral body is gone into shell;

(10) roll up core integral body routinely and go into battery case periphery welding behind the shell, finish the battery assembling.

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