CN2763997Y

CN2763997Y - Lithium cell core structure

Info

Publication number: CN2763997Y
Application number: CNU2004201035777U
Authority: CN
Inventors: 邓健想; 许汉良; 郭春泰
Original assignee: Huizhou TCL Jinneng Battery Co Ltd
Current assignee: TCL Corp
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-03-08
Anticipated expiration: 2014-12-29

Abstract

The utility model discloses an electric core structure of a lithium cell, which comprises a positive pole, diaphragms and a negative pole which are orderly stacked together, wherein a head sheet and a tail sheet which are stacked in sequence are naked, and the diaphragms are stacked between a second piece of pole piece and a penultimate piece of the pole piece. The head end and the tail end of each of the diaphragms are mutually connected, the stacked diaphragms are in a Z shape, and each of the diaphragms among the pole pieces has a single layer. The length of the diaphragm of the electric core structure provided by the utility model can be shorted by at least 1.2 times of the width of the pole piece, the cost of the diaphragms can be directly reduced, and the thickness of an electrical core is reduced. The utility model increases geometric space for the raising of the capacity of the polymer lithium-ion electric core.

Description

A kind of electric core structure of lithium battery

Technical field

The utility model relates to the battery technology field, refers more particularly to a kind of electric core structure of lithium battery.

Background technology

Traditional lithium ion battery comprises stacked and reels two kinds of structures, traditional winding-structure, battery plus-negative plate has only a lug, after being separated by with barrier film, rotates around changeing core together both positive and negative polarity, withdraw from the commentaries on classics core utmost point behind the coiling and can obtain battery roll core, the method only is useful in the small-capacity cells manufacturing, during for preparation high capacity cell pole piece, pole piece is quite long, causes the pole piece manufacturing and the difficulty of reeling; Stepped construction is the positive negative film of battery to be added barrier film it is arranged by overlapped way, the pole piece that to arrange (comprising lug) then, the barrier film two ends are fixed with metallic plate, the battery that fixes is put into battery case, for the polymer Li-ion electricity core that adopts " Z " font laminating method, as shown in Figure 1, second pole piece 2 usefulness barrier film 3 encased when lamination began, diaphragm heads 31 is positioned at an end on second pole piece top, winding encases pole piece, put a slice pole piece in diaphragms then, barrier film adopts " Z " font to twine, and has folded second from the bottom, second pole piece walking around beginning with barrier film encases electric core, and barrier film tail 32 is fixed on the top of second pole piece.On second pole piece that begins like this 4 layers of barrier film are just arranged, the shortcoming of this laminating method has: 1, increased the barrier film cost; 2, increased the thickness of electric core; 3, reduced the ion migration rate.The battery of the disclosed stepped construction of China's No. 02216687.4 patent of ZL " polymer Li-ion battery ", with the aluminum wire netting as cathode current collector, the employing Copper Foil is an anode collector, reduced the internal resistance of cell, improved adhesion with anode active material, improved the cycle life and the operating time of battery, but it reduces electric core thickness aspect and still has defective reducing the barrier film cost.

The utility model content

Technical problem to be solved in the utility model provides a kind of thin thickness, lithium battery electric core that cost of manufacture is low.

The utility model is achieved through the following technical solutions:

A kind of electric core structure of lithium battery, comprise the positive pole, barrier film and the negative pole that stack gradually together, wherein stack gradually first and cauda expose, the stacked barrier film that is provided with between second pole piece and second from the bottom pole piece, the head end of barrier film is connected with tail end, stacked barrier film is zigzag, and the pole piece spacer film is individual layer.

The utility model compared with prior art has following remarkable result: second pole piece of battery battery core provided by the utility model surrounds without barrier film, having saved diaphragm material makes electric core thickness reduce simultaneously, not only can save cost, and be that polymer Li-ion electricity core capacity promotes the increase geometric space.

Description of drawings

Fig. 1 is existing battery battery core structural representation.

Fig. 2 is the schematic diagram of the utility model execution mode.

Embodiment

The utility model is described in further detail by embodiment below in conjunction with accompanying drawing.

The utility model embodiment is as shown in Figure 2: a kind of electric core structure of lithium battery, comprise the positive pole that stacks gradually together, barrier film and negative pole, stack gradually first 1 and cauda 5 expose, be that lamination begins second pole piece 2 without the barrier film bag, put one deck barrier film near edge in the above, the head end 31 of barrier film is positioned at the end of second pole piece 2, and then put a slice pole piece, barrier film adopts " Z " font winding method, folded second from the bottom 4, around connecing tail to 2 pairs of barrier films of second pole piece, promptly barrier film tail end 32 is connected with head end 31 barrier film again, connects tail with first 1 and 5 pairs of electric cores that wind with barrier film of cauda again.

Core strueture provided by the utility model can shorten 1.2 times of barrier film length that pole piece is wide at least, can directly reduce the barrier film cost, and reduces electric core thickness, has increased geometric space for polymer Li-ion electricity core capacity promotes.

Claims

1, a kind of electric core structure of lithium battery, comprise the positive pole (1), barrier film (3) and the negative pole (2) that stack gradually together, it is characterized in that: first (1) and the cauda (5) that stack gradually expose, the stacked barrier film (3) that is provided with between second pole piece (2) and second from the bottom pole piece (4), the head end of barrier film (31) is connected with tail end (32).

2, electric core structure of lithium battery according to claim 1 is characterized in that: stacked barrier film is zigzag, and the pole piece spacer film is individual layer.