CN201741765U

CN201741765U - Battery cell of power-type lithium ion battery

Info

Publication number: CN201741765U
Application number: CN2010202464614U
Authority: CN
Inventors: 孙全
Original assignee: Shuangdeng Science & Technology Development Academy Co Ltd Nanjing City
Current assignee: Shuangdeng Science & Technology Development Academy Co Ltd Nanjing City
Priority date: 2010-06-30
Filing date: 2010-06-30
Publication date: 2011-02-09
Anticipated expiration: 2020-06-30

Abstract

The utility model discloses a battery cell of a power-type lithium ion battery. One side of a positive pole plate and that of a negative pole plate are coated with active material coating layers; and the single positive pole plate coating layer is opposite to the single negative pole plate coating layer, a layer of diaphragm is clamped between the positive pole plate coating layer and the negative pole plate coating layer, and the single and negative positive pole plates and the diaphragm are folded together to form an S-shaped laminated battery cell in a reciprocating manner. The positive pole plate and the negative pole plate are provided with a plurality of positive plate lugs and negative plate lugs respectively, which are connected with the pole plates into a whole; the positive plate lugs and the negative plate lugs are overlapped in the battery cell respectively; and gumming paper is pasted to four corners of the battery cell. The assembled lithium ion battery has good consistency, low internal resistance and large capacity, so that the utility model is particularly suitable for serving as the power-type lithium ion battery.

Description

The power-type lithium ion battery cell

Technical field

The utility model relates to a kind of lithium ion battery, is specifically related to the power-type lithium ion battery cell.

Background technology

Lithium ion battery is made up of anode pole piece, cathode pole piece, barrier film, electrolyte and shell.The lithium ion cell electrode active material generally adopts dual coating at present, and the full accuracy of coating machine also can only be accomplished single face 2～3 μ m, the dried thickness error of two-sided 4～6 μ m.The electric automobile field that is applied in that the power-type lithium ion battery is main, often up to a hundred cell connection in series-parallel are used, and are very high to the coherence request of battery.And just having caused the error of pole piece thickness 4～6 μ m at painting process, this is the relatively poor one of the main reasons of present power-type battery consistency.

Lithium ion battery cell mainly contains and reels and two kinds of structures of lamination at present.Winding-structure is that dual coating both positive and negative polarity pole piece is made strip, and the lug of burn-oning is wrapped barrier film, is rolled into the semi-finished product battery.Winding process efficient height, but the internal resistance of cell is higher, and be not suitable for doing jumbo battery.Lamination is that dual coating both positive and negative polarity pole piece is made sheet, and the alternate folded sign indicating number of positive/negative plate becomes the semi-finished product battery, and the centre separates with barrier film.The laminated batteries internal resistance is low, is fit to do high capacity cell, but film-making technology relative complex, and the lamination process efficiency is low simultaneously.

The utility model content

The purpose of this utility model is to overcome existing the coiling and the weak point of lamination type electric core, provide that a kind of internal resistance of cell is low, capacity greatly, high conformity, and the high power-type lithium ion battery cell of production efficiency.

The technical solution of the utility model is: the power-type lithium ion battery cell, comprise anode pole piece, cathode pole piece and barrier film, its improvements are: the single face of anode pole piece and cathode pole piece has the active material coat, the coat of individual positive plate and individual negative plate is relative, therebetween one deck barrier film, be folded into S shape lamination type electric core jointly back and forth, described positive and negative plate has a plurality of positive and negative lugs that fuse with pole piece respectively, and positive and negative lug overlaps respectively in lamination type electric core.

Four jiaos of described S shape lamination type electric core are posted gummed paper.

Compare with existing structure, the utility model mainly contains following advantage:

1, positive/negative plate adopts single face to apply, and the thickness error of coating only is half of dual coating, improves the consistency of battery greatly.

2, adopt individual both positive and negative polarity pole piece, avoided in the lamination negative pole to adopt many pole pieces, the corner burr pierces through barrier film, and electric in-core portion micro-short circuit causes electric core to scrap situation.Leave a plurality of lugs on the pole piece, lug when die-cut and pole piece fuse, do not need the welding, contactless internal resistance; Multipole ear designs, and has shortened the migration distance of electronics, and pole piece can be fit to the battery of power type with than high current density discharge very much.

3, S shape is folding, because the consistent size of each lamination, the multipole ear of both positive and negative polarity can accurately be accomplished to overlap respectively.If employing winding-structure, the location of both positive and negative polarity lug be difficulty very, because the length that every volume one encloses required pole piece all can increase, behind the coiling, the lug of electric core often can not overlap, and the lug welding of back segment operation can't be implemented.

4, individual positive/negative plate S shape folding and forming, work simplification, production efficiency height.

Description of drawings

Fig. 1 is the utility model structural representation;

Fig. 2 is the transverse cross-sectional view of Fig. 1.

Embodiment

Below by embodiment, and in conjunction with the accompanying drawings the utility model and performance comparison thereof are described further.

Embodiment 1:

With 5Ah power-type lithium manganate battery is example, under the on all four situation of the Recipe of batch mixing, respectively according to each 10 battery of the utility model, winding-structure and lamination production.Wherein the utility model specifically describes as follows:

1, the both positive and negative polarity active material is coated in both positive and negative polarity collector single face respectively and forms both positive and negative polarity utmost point volume, and the utmost point is rolled up after roll-in, cutting, and according to the width of design battery, determines to reserve the position of both positive and negative polarity lug, die-cut formation both positive and negative polarity pole piece.

2, the coat 4 of plus plate current-collecting body 3 is relative with the coat 5 of negative current collector 6, therebetween one deck barrier film 7, and the width according to the design battery is folded into electric core by S shape, and positive pole ear 1, negative lug 2 overlap respectively in the electric core in folding back.

3, use gummed paper 8 with electric core Corner Strapped, go into shell welding, fluid injection at last, change into, make the finished product battery.

The main performance contrast:

Embodiment 2:

With the 8Ah high power lithium iron phosphate cell is example, under the on all four situation of the Recipe of batch mixing, respectively according to each 10 battery of the utility model, winding-structure and lamination production.Specific descriptions are with example 1.

The main performance contrast:

Claims

1. power-type lithium ion battery cell, comprise anode pole piece, cathode pole piece and barrier film, it is characterized in that: the single face of anode pole piece and cathode pole piece has the active material coat, the coat of individual positive plate and individual negative plate is relative, therebetween one deck barrier film, be folded into S shape lamination type electric core jointly back and forth, described positive and negative plate has a plurality of positive and negative lugs that fuse with pole piece respectively, and positive and negative lug overlaps respectively in lamination type electric core.

2. by the described power-type lithium ion battery cell of claim 1, it is characterized in that four jiaos of described S shape lamination type electric core post gummed paper.