The method for packing of electric core of flexible packing lithium battery
Technical field
The invention belongs to the manufacture method of lithium battery, relate in particular to the method for packing of electric core of flexible packing lithium battery.
Background technology
At present, in all kinds lithium battery, flexible package lithium cell is with high-energy-density, and is in light weight, and the advantage that form is made by oneself etc. is used widely in various digital electronic goods.In the flexible package lithium cell production process, the flexible packaging film front and the side that need lithium cell will be housed seal weldering, reach the purpose of sealing flexible package lithium cell with this.The flexible packaging film that is used for lithium battery production is a kind of five layers composite membrane, be one deck aluminium foil in the middle of generally being, the two sides is respectively two-layer PE, PP, when heat-sealing weldering front, wherein the PP of the inside of the PP of Yi Mian composite membrane inside and PE layer and another layer composite membrane and PE melting layer are integral, and the two sides composite membrane is merged.When using flexible packaging film, flexible packaging film need be washed into the groove of respective depth, come out to roll up core to lay corresponding lithium battery.During towards film, PP that it is inner and PE layer can draw thin in reality, even with two-layer drawing crack, make the aluminium foil of internal layer expose.When the heat-sealing weldering, its inner PP, PE layer alternately melt, and by pushing, its liquid colloid can be exuded to packaging film inside, forms small adhesive ball, after treating its cooling back or side bending, its small adhesive ball can break or come off from composite membrane inside, causes the aluminium foil of its internal layer directly to contact with having corrosive electrolyte, and then damages the lithium battery sealing, cause lithium battery leakage and bulging, scrap.
Summary of the invention
The method for packing that the purpose of this invention is to provide a kind of electric core of flexible packing lithium battery is respectively 0.05~0.5 millimeter by the soldering and sealing position apart from volume core side, by adjusting the soldering and sealing position, has thoroughly solved the problem of flexible package lithium cell soldering and sealing position leakage.
Realize that technical scheme of the present invention is: this method comprises that lithium cell three faces that will be enclosed with the volume core with flexible packaging film seal weldering, and its concrete steps are as follows:
Flexible packaging film is washed into the groove of respective depth according to lithium battery thickness;
In groove, lay the volume core;
Soldering and sealing electricity core front position;
The soldering and sealing position is 0.05~0.5 millimeter apart from volume core side;
Heat-sealing weldering flexible packaging film.
This method also comprises:
Described flexible packaging film is respectively the distribute composite membrane of one deck PE and one deck PP film of one deck aluminium foil and two sides in the middle of comprising.
The groove of described respective depth satisfies volume core encapsulation requirement.
Described heat-sealing weldering is meant that wherein the PP of the inside of the PP of Yi Mian composite membrane inside and PE layer and another layer composite membrane and PE melting layer are integral, and the two sides composite membrane is merged when the heat-sealing weldering.
Described soldering and sealing position is 0.1 millimeter apart from volume core side.
The beneficial effect that the present invention has: by adjusting the soldering and sealing position, realized the no leakage of product, the useful life of having improved product, have technology simple, easy to operate, do not increase characteristics such as cost.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
Fig. 2 is that the B of Fig. 1 is to partial enlarged drawing.
Fig. 3 is the A-A cutaway view of Fig. 1.
Among the figure: anchor clamps, 2 volume cores, 3 composite package films, 4 side seal lower clamps, 5 small adhesive balls on 1 side seal.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing:
The composite package films 3 of anchor clamps 1 and 4 pairs of volumes of side seal lower clamp core, 2 outsides carry out heat-seal on this method use side seal, concrete steps are to change the original volume core 2 of being close to carry out soldering and sealing, but the soldering and sealing position of side (being the position of anchor clamps 1 and side seal lower clamp 4 on the side seal) left under order 0.05~0.5 millimeter in interior roll core, promptly roll up core 2 positions from 0.05~0.5 millimeter of composite package film 3 inner wall position, make when soldering and sealing, composite package film 3 inwall chemical compositions do not form the liquid colloid, make the liquid colloid not ooze out or do not form small adhesive ball 5, thereby prevented that electrolyte from directly acting on the aluminium foil in the composite package film 3, further prevents flexible package lithium cell leakage and bulging.
The present invention leaves the soldering and sealing position of side under order interior roll core 0.05~0.5 millimeter, in actual mechanical process, it is the composite package film distance of regulating anchor clamps and its side on the side seal, by measuring instrument (as clearance gauge), leave the soldering and sealing position under order interior roll core position 0.05~0.5 millimeter, the present invention is preferably 0.1 millimeter.Heat-sealing is welded then, can reach the effect of setting.
Embodiment 1: anchor clamps on the side seal are sticked the gummed paper (or substitute of similar gummed paper) of which floor 0.01 millimeters thick near volume core one side, and the hot pressing side seal with the impression contrast standard film of flexible package lithium cell, is selected 0.05 millimeter standard then, can reach requirement.
The heat-sealing anchor clamps that the present invention relates to are known technology.
The heat-sealing temperature that the present invention relates to, time, pressure etc. are known technology.