CN203562483U - Polymer ultrathin lithium ion battery - Google Patents

Abstract

The utility model discloses a polymer ultrathin lithium ion battery and relates to the technical field of batteries. The polymer ultrathin lithium ion battery comprises a cell body, a packing layer and a protecting plate. The cell body comprise a short side wall and a long side wall. The packing layer comprises a top seal edge and two lateral seal edges. The top seal edge, the two lateral seal edges and short side wall of the cell body encloses a top seal groove. The protecting plate comprises a circuit board, an element and a bonding pad. Each lateral seal edge includes a first folding edge and a second folding edge, the first folding edge is folded externally, and the problem that the width of the existing polymer lithium battery is large due to the first folding edge is folded internally in the prior art is solved. The length of the polymer lithium battery can be reduced by folding the protecting plate into the top seal groove. By disposing the element, the bonding pad and the tin points of the protecting plate on the same side of the protecting plate, the thickness of the protecting plate can be reduced, and the problem that the screen a tablet computer generates ripples can be solved. Due to the fact that the width, length and thickness of the polymer lithium battery are reduced at the same time, the polymer ultrathin lithium ion battery is small in size and applicable to battery cases with small spaces.

Description

A kind of polymer ultrathin lithium ion battery

Technical field

The utility model relates to battery technology field, particularly relates to a kind of polymer ultrathin lithium ion battery.

Background technology

Present electronic product is more and more to frivolous future development, just the thickness requirement of the battery to its use is very high for this, take panel computer as example, because it belongs to portable small-sizedization mobile electronic product, its inner space is very narrow and small, very high to cell thickness requirement, if cell thickness control is bad, will make the assembling of electronic product be had a strong impact on, easily because of battery top screen, cause that screen water ripples etc. are bad.

Poly-lithium battery generally comprises battery core, protective layer, baffle and wire, and the flanging mode of two side sealings of protective layer has single flanging and double-fold, and polymer thin battery core is mainly in double-fold mode as main, and double-fold comprises the first flanging and the second flanging.

As shown in Figure 3 and Figure 4, the customary means of prior art is all that the first flanging is rolled over inward, and its drawback is: the width of the first flanging can not be oversize, if if the width of the first flanging is oversize, the first flanging easily opens folding not to be gone up, and causes the wider width of poly-lithium battery.

In prior art, as shown in Figure 6, baffle generally comprises circuit board, element, pad and tin point, and upward, therefore, the thickness of battery core depends primarily on the total height of baffle to its element.In battery core and baffle assembling process; the element of baffle conventionally and pad be placed in not coplanar; baffle with cell polar ear welding and electric wire and baffle welding after; because the element of tin point and baffle is at coplanar not; baffle reverse side has bump; therefore, the total height of baffle equals height and the thickness sum of baffle own of the element of tin point height, baffle, and the thickness that such design causes battery core is conventionally blocked up because reducing the thickness of the whole battery that seems.

In addition, baffle is generally positioned over the side of the closedtop groove of battery core, when the space of battery compartment hour, it is long that the poly-lithium battery of this kind of design just seems, is difficult to put into battery compartment.

To sum up, the volume of the poly-lithium battery of above technology is larger.

Summary of the invention

The purpose of this utility model is to avoid weak point of the prior art and a kind of polymer ultrathin lithium ion battery is provided, the very thin thickness of this polymer ultrathin lithium ion battery, be applied in super-thin electronic product, the screen that can solve the blocked up panel computer causing of battery in prior art produces the problem of water ripples; Also can adapt to the less battery compartment in space.

The purpose of this utility model is achieved through the following technical solutions:

A kind of polymer ultrathin lithium ion battery is provided, comprise battery core main body and for wrapping up the wrapper of battery core main body, battery core main body comprises two short sidewalls and two long sidewalls, wrapper comprises closedtop limit and two side sealings, a short sidewall of closedtop limit and two side sealings and battery core main body surrounds closedtop groove, closedtop limit is connected with lug, lug is connected with baffle, baffle comprises circuit board and is arranged at element and the pad on circuit board, the element of baffle, the tin point of the pin of pad and element and pad welding is all positioned at the same face of circuit board, baffle folds into closedtop groove inside, side sealing is set to double-fold, and double-fold comprises the first flanging and the second flanging, and the first flanging is arranged at away from long sidewall, and the second flanging is arranged near long sidewall.

Preferably, the length of the first flanging is no more than the length of the second flanging.

Wherein, wrapper is aluminium foil.

Wherein, lug is set to two.

Wherein, it is parallel to each other that double-fold is U font and the first flanging and the second flanging.

Wherein, the angle a between double-fold and wrapper is less than 90 degree.

Wherein, the volume of circuit board is not more than the volume of closedtop groove.

Wherein, the direction of the element of baffle is towards closedtop limit.

The beneficial effects of the utility model: the utility model by by the first flanging of the double-fold of prior art for to change outside folding into infolding, can solve prior art oversize and cause the first flanging easily to open to the first flanging of infolding, cause the problem of the wider width of poly-lithium battery, baffle is folded into closedtop groove inside simultaneously and can reduce the length of poly-lithium battery; In addition; by the tin point of the pin of the pad of the element of baffle, baffle and element and pad welding being arranged to the same face of baffle; can reduce the thickness of baffle; make polymer ultrathin lithium ion battery can do very thinly; be applied in super-thin electronic product; the screen that can solve the panel computer causing because battery is blocked up in prior art produces the problem of water ripples; by reduce width, length and the thickness of poly-lithium battery simultaneously; make the small volume of polymer ultrathin lithium ion battery, can adapt to the less battery compartment in space.

Accompanying drawing explanation

Utilize accompanying drawing to be described further utility model, but the embodiment in accompanying drawing does not form any restriction of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to the following drawings other accompanying drawing.

Fig. 1 is a schematic diagram of battery core main body of the present utility model and wrapper.

Fig. 2 is another schematic diagram of battery core main body of the present utility model and wrapper.

Fig. 3 is the battery core main body of prior art and a schematic diagram of wrapper.

Fig. 4 is the battery core main body of prior art and another schematic diagram of wrapper.

Fig. 5 is the structure of baffle of the present utility model and the position relationship schematic diagram of baffle and closedtop groove.

Fig. 6 is the structure of baffle and the position relationship schematic diagram of baffle and closedtop groove of prior art.

In figure, include:

1---the short sidewall of battery core main body, 11---long sidewall, 12---;

2---closedtop limit;

3---side sealing;

31---the first flanging;

32---the second flanging;

6---lug;

7---closedtop groove;

81---circuit board, 82---element, 821---pin, 83---pad, 84---tin points.

Embodiment

With the following Examples the utility model is further described.

A kind of polymer ultrathin lithium ion battery of the present embodiment, as illustrated in fig. 1 and 2, it comprises battery core main body 1 and for wrapping up the wrapper of battery core main body 1, battery core main body 1 comprises two short sidewalls 12 and two long sidewalls 11, wrapper comprises closedtop limit 4 and two side sealings 5, a short sidewall 12 of closedtop limit 4 and two side sealings 5 and battery core main body 1 surrounds closedtop groove 7, closedtop limit 4 is connected with lug 6, lug 6 is connected with baffle, baffle comprises circuit board 81 and is arranged at element 82 and the pad 83 on circuit board 81, in the present embodiment, the element 82 of baffle, the tin point 84 that pin 821 and the pad 83 of pad 83 and element 82 welds is all positioned at the same face of circuit board 81, baffle folds into closedtop groove 7 inside, side sealing 5 is set to double-fold, and double-fold comprises that the first flanging 2 and the second flanging 3, the first flangings 2 are arranged at away from long sidewall 11, the second flangings 3 and is arranged near long sidewall 11.

Baffle altogether takies thickness space and is no more than 2.0mm, and the finished product thickness of battery can be controlled at 2.0mm to 3.6mm.

Certainly, if battery compartment space is enough, also can adopts and baffle not folded into closedtop groove 7; baffle directly keeps flat; and be positioned at the side away from battery core main body 1 of closedtop groove 7, baffle placement parallel with battery core main body 1, also can be controlled at battery finished product thickness below 3.0mm.

Comparatively preferred, the length of the first flanging 2 is no more than the length of the second flanging 3.Can improve edge sealing effect, reduce edge sealing difficulty.

Wherein, wrapper is aluminium foil.Aluminium foil can prevent better battery core body corrosion and with extraneous short circuit, have 1, a high barrier; 2, good cold stamping shaped property; 3, paracentesis resistance; 4, electrolyte resistance stability; 5, electrical property better (comprising insulating properties).

Wherein, lug 6 is set to two.The quantity of lug 6 can arrange according to actual needs.

Wherein, it is parallel to each other that double-fold is U font and the first flanging 2 and the second flanging 3.The double-fold of this structure is more saved the space of double-fold.

Wherein, the angle a between double-fold and wrapper is less than 90 degree.Double-fold is not easy to open.

Wherein, circuit board 81 volumes are not more than the volume of closedtop groove 7.Make circuit board 81 just put into closedtop groove 7 inside, can not give prominence to outward.

Wherein, the direction of the element 82 of baffle is towards closedtop limit 2.When baffle does not fold into closedtop groove, its element 82 is directed upwardly, and while folding into closedtop groove 7, is equivalent to baffle to turn over turnback, and after upset, element 82 directions of baffle are towards closedtop limit 2.

The present embodiment by by the first flanging 2 of the double-fold of prior art for to change outside folding into infolding, can solve prior art oversize and cause the first flanging 2 easily to open to the first flanging 2 of infolding, cause the problem of the wider width of poly-lithium battery, baffle is folded into closedtop groove 7 inside simultaneously and can reduce the length of poly-lithium battery, in addition, by by the element of baffle 82, the tin point 84 that the pad 83 of baffle and the pin of element 82 821 and pad 83 weld is arranged at the same face of baffle, can reduce the thickness of baffle, make polymer ultrathin lithium ion battery can do very thinly, be applied in super-thin electronic product, the screen that can solve the panel computer causing because battery is blocked up in prior art produces the problem of water ripples, by reduce the width of poly-lithium battery simultaneously, length and thickness, make the small volume of polymer ultrathin lithium ion battery, can adapt to the less battery compartment in space.

Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.

Claims (8)

1. a polymer ultrathin lithium ion battery, it is characterized in that: comprise battery core main body and for wrapping up the wrapper of battery core main body, battery core main body comprises two short sidewalls and two long sidewalls, described wrapper comprises closedtop limit and two side sealings, a described short sidewall of described closedtop limit and two described side sealings and described battery core main body surrounds closedtop groove, described closedtop limit is connected with lug, described lug is connected with baffle, and described baffle comprises circuit board and is arranged at element and the pad on described circuit board;

The tin point of the pin of element, pad and the element of described baffle and the welding of described pad is all positioned at the same face of described circuit board, and described baffle folds into described closedtop groove inside;

Described side sealing is set to double-fold, and double-fold comprises the first flanging and the second flanging, and described the first flanging is arranged at away from described long sidewall, and described the second flanging is arranged near described long sidewall.

2. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: the length of described the first flanging is no more than the length of described the second flanging.

3. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: described wrapper is aluminium foil.

4. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: described lug is set to two.

5. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: it is parallel to each other that described double-fold is U font and described the first flanging and described the second flanging.

6. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: the angle a between described double-fold and described wrapper is less than 90 degree.

7. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: the volume of described circuit board is not more than the volume of described closedtop groove.

8. a kind of polymer ultrathin lithium ion battery as claimed in claim 1, is characterized in that: the direction of the element of baffle is towards closedtop limit.

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