CN101093898B

CN101093898B - Structural design of soft package for the core of lithium ion cell, and fabricating method

Info

Publication number: CN101093898B
Application number: CN2006100956595A
Authority: CN
Inventors: 薛志强; 黄揭旭; 谢德明; 冯灿芬; 利志伟; 林日晖; 黄文威; 冯干伟; 邱志云; 林汉民; 欧万强
Original assignee: DANLIAN BATTERY (SHENZHEN) Co Ltd
Current assignee: DANLIAN BATTERY (SHENZHEN) Co Ltd
Priority date: 2006-06-20
Filing date: 2006-06-20
Publication date: 2012-03-21
Anticipated expiration: 2026-06-20
Also published as: CN101093898A

Abstract

Increasing width of sealed edge for pole ear side and folded side, and making multiple times of sealed edge raises performance for sealing edge markedly, and reduces risk of leaking electrolyte from sealing edges of battery. Folding sealed edge for pole ear side makes unchanged ratio between pole ear side and length of battery. The disclosed method gathers advantages of current batteries in soft package for the battery prepared by using the invention. Moreover, under condition of not changing side utilized by sealed edge of battery, the invention raises performance of sealed edge markedly.

Description

Design of core of lithium ion cell soft package structure and manufacturing approach thereof

Technical field

The present invention relates to a kind of soft package structure of core of lithium ion cell, particularly a kind of polymer Li-ion battery core soft package structure.The invention still further relates to the method for making this structure.

Background technology

Polymer Li-ion battery is a kind of employing flexible packing material, and volume is little, and is in light weight, the novel rechargeable battery of safety non-pollution.People just further improve the volume of battery Capacity Ratio, and improve the performance of battery own, to meet the need of market.

About the soft package structure of core of lithium ion cell, can be with reference to Chinese patent number: ZL03137057.8 and one Chinese patent application publication number CN1340444A (application number 00126905.4).

The core of lithium ion cell flexible package is positioned at the shell of battery, is used for sealing and protection battery core body.Be applicable to the lithium ion battery and the polymer Li-ion battery of any size.

But battery of the prior art do not have repeatedly edge sealing and to the lug limit and with the limit that intersects on the lug limit be the function that conduplication side carries out folding.

Summary of the invention

The present invention provides a kind of repeatedly edge sealing and lug limit of flexible-packed battery and the conduplication side that intersects with the lug limit structure and the manufacturing approach thereof of folding flanging respectively.The battery that is made by the inventive method is through increasing lug limit and conduplication side edge sealing width and edge sealing repeatedly, significantly improves the edge sealing performance and reduces the battery edge sealing and leak the electrolyte risk, and it is constant to make the lug limit take the battery length scale through folding lug banding limit simultaneously.

Battery by the inventive method makes has been gathered the advantage of existing flexible-packed battery, and has the advantage that under battery edge sealing zone takies the situation of size constancy, significantly improves the edge sealing performance.

Description of drawings

Fig. 1 is the structural representation of flexible package commonly used;

Fig. 2 is for after the soft package structure of battery core battery heat seal of the present invention, removes the sketch map after the unnecessary packaging bag according to the process requirements cutting;

Fig. 3 is the example structure sketch map of soft package structure of battery core of the present invention;

Fig. 3 (1) is first example structure sketch map of soft package structure of battery core of the present invention;

Fig. 3 (2) is second example structure sketch map of soft package structure of battery core of the present invention;

Fig. 3 (3) is the 3rd example structure sketch map of soft package structure of battery core of the present invention;

Fig. 3 (4) is the 4th example structure sketch map of soft package structure of battery core of the present invention;

Fig. 4 is first embodiment step of manufacturing figure of soft package structure of battery core of the present invention.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the present invention is further described.

(comprising Fig. 3 (1), Fig. 3 (2), Fig. 3 (3) and Fig. 3 (4)) as shown in Figure 3, be four embodiment of soft package structure of battery core of the present invention.Shown in Fig. 3 (1), a kind of soft package structure of battery core adopts the aluminium plastic composite packaging film to seal, on one side it is used for embedded battery core 1 (seeing the dash area of accompanying drawing) back doubling, the limit that

seals lug

2 and 3 is lug limit A, and the limit of intersecting with lug limit A is B and C.The lug limit is A1 near the lug limit part of battery one side, is A2 (lug limit A1 and A2 partly see Fig. 2 institute method) away from the lug limit part of battery one side.

The part of the soft package structure of battery core in the accompanying drawing is explained as follows:

The 1---battery: diaphragm material is reeled or superposition forms battery by inserting in the middle of anode pole piece behind the soldering polar ear and the cathode pole piece.

The 2---positive pole ear: the be welded part of battery of aluminium flake or nickel sheet and anode pole piece,

The 3---negative lug: the be welded part of battery of copper sheet or nickel sheet and cathode pole piece,

The material of battery flexible package is the aluminium plastic composite packaging film, and its limit that seals lug 2 and 3 is lug limit A, and the limit of intersecting with lug limit A is conduplication side B and C.

As shown in Figure 4, an embodiment manufacturing approach for soft package structure of battery core of the present invention may further comprise the steps:

1) lug limit A is edge sealing or edge sealing repeatedly; Repeatedly edge sealing is meant by certain sequencing that to the lug limit near the lug limit part A 1 of battery one side with away from the lug limit part A 2 heat-sealing limits of battery one side, repeatedly the zone of edge sealing can allow certain lap (seeing Fig. 4 (A)).

2) after the flexible-packed battery core heat seal, go unnecessary packaging bag (seeing Fig. 4 (A)) according to the size and the process requirements cutting of battery (1).

3) A edge sealing place, lug limit is along near about 90 degree of doubling upwards lug limit and the battery intersecting lens, with

lug

2 and 3 about 90 degree that turn back, recovers the direction (seeing Fig. 4 (B)) of the preceding lug 2 of lug limit A doubling and 3 again.

The both sides of 4) intersecting with the lug limit are conduplication side B and C, and the flanging number of times of conduplication side B and C is for once or twice, the angle of doubling be about 90 degree or earlier folding about 180 spend and roll over about 90 again and spend (seeing Fig. 4 (B)).

5) A, the sequencing of the flanging on B and C three limits can need and be decided according to production, and following three kinds of orders are arranged: 1. roll over the A limit earlier, roll over B and C limit again; 2. roll over B and C limit earlier, roll over the A limit again; 3. A, B and three limits, C limit are flanging simultaneously;

6) A makes lug limit A with the folding place of coincidence of conduplication side B and C, and need be folded to certain angle (can become 0-270 degree angle with C with lug limit A or conduplication side B) according to production behind B and the C three edge break limits;

7) among Fig. 4 (C) lug limit A the angle that folds with the folding place of coincidence of conduplication side B and C can be Fig. 3 (1), any one among Fig. 3 (2), Fig. 3 (3) and Fig. 3 (4) or the angle that folds become 0-270 degree angle with lug limit A or conduplication side B with C).

Claims

1. battery packaging structure, adopt the aluminium plastic composite packaging film to seal after, reach method packing flanging in sequence and form respectively sealing the limit, it is characterized in that:

1) lug limit (A) is edge sealing or edge sealing repeatedly; Repeatedly edge sealing is meant by certain sequencing that to the lug limit near the lug limit part (A1) of battery one side with away from lug limit part (A2) the heat-sealing limit of battery one side, repeatedly the zone of edge sealing allows certain lap;

2) battery is removed unnecessary packaging film according to the size and the process requirements cutting of battery (1) after packing;

3) edge sealing place, lug limit (A) is along near doubling 90 degree upwards lug limit and the battery intersecting lens, again with first lug (2) and second lug (3) 90 degree that turn back, the direction of recovery preceding first lug of lug limit (A) doubling (2) and second lug (3);

4) be first conduplication side (B) and second conduplication side (C) with crossing both sides, lug limit (A), first conduplication side (B) and second conduplication side (C) use a flanging or twice flanging, direct doubling 90 degree during a flanging, and elder generation's doubling 180 degree are rolled over 90 degree again during twice flanging;

5) lug limit (A), the sequencing of the flanging on first conduplication side (B) and second conduplication side (C), three limits needs according to production and decides, and is one of following three kinds of orders: 1. roll over lug limit (A) earlier, roll over first conduplication side (B) and second conduplication side (C) again; 2. roll over first conduplication side (B) and second conduplication side (C) earlier, roll over lug limit (A) again; 3. lug limit (A), first conduplication side (B) and second conduplication side (C), three limits flanging simultaneously;

6) lug limit (A) is overlapped with the folding place of coincidence of first conduplication side (B); Lug limit (A) is overlapped with the folding place of coincidence of second conduplication side (C); And need be folded to certain angle according to production, become 0-270 degree angle with lug limit (A) or first conduplication side (B) with second conduplication side (C).