CN203218367U

CN203218367U - Tab of flexibly packaged lithium ion battery

Info

Publication number: CN203218367U
Application number: CN2013202416506U
Authority: CN
Inventors: 刘登科
Original assignee: BEIJING DINGNENG KAIYUAN BATTERY TECHNOLOGY Co Ltd
Current assignee: Shanxi Dingneng Qiyuan New Energy Technology Co ltd
Priority date: 2013-05-07
Filing date: 2013-05-07
Publication date: 2013-09-25
Anticipated expiration: 2023-05-07

Abstract

A tab of a flexibly packaged lithium ion battery comprises an upper film, a lower film and a tab metal strap. The tab metal strap are clamped between the films, diagonal planes are arranged on two side surfaces of the tab metal strap, and grooves are formed in the two side surfaces of the tab metal strap. The tab of the flexibly packaged lithium ion battery has the advantages that a tab metal strap of the traditional tab is simply machined, so that the problem of electrolyte leakage of side surfaces of the traditional tab of a flexibly packaged lithium ion battery is solved, the sealing performance of the tab is guaranteed, and the reliability of the battery is effectively improved; the tab metal strap of traditional tab is only simply machined without changing the structure, a manufacturing procedure, a manufacturing process and equipment of the original battery, operation is facilitated.

Description

A kind of Soft Roll lithium ion cell polar ear

Technical field

The utility model relates to a kind of Soft Roll lithium ion battery, especially relates to a kind of Soft Roll lithium ion cell polar ear.

Background technology

Lithium ion battery can be divided into types such as box hat battery, aluminum-shell battery, soft-package battery, electric battery with plastic case according to the packing classification.Wherein soft-package battery is to adopt aluminum-plastic composite membrane to pack by hot-press sealed, has advantages such as volume is little, in light weight, specific energy is high, appearance looks elegant, equipment less investment, and range of application is more and more wider.At present in fields such as electric automobile, electric bicycle and energy storage batteries a large amount of application is arranged.

The major defect of soft-package battery is the easy leakage in derivation position of lug side.This problem also is the modal problem of lithium ion battery factory soft-package battery.In order to overcome leakage, used a lot of technology in the soft-package battery encapsulation process, technology such as for example lug surface coating, roughening are handled, aluminum plastic film is coated with fluid sealant again, secondary seals, but above-mentioned technology all can not solve the leakage problem fully.

By analysis and the dissection to the Soft Roll lithium ion battery, find that lug side leakage mainly is that aluminum plastic film is poorly sealed the lug side, as shown in Figure 1 because lug has certain thickness.Cause poorly sealed reason be one owing to there is the physical phenomenon of the objective reality cause in lug thickness, even the lug surface coating can not guarantee to accomplish to seal fully.Therefore, must improve existing extreme ear structure, could effectively realize the sealing effectiveness that the lug side is good.

The utility model content

(1) technical problem that will solve

The purpose of this utility model provides a kind of Soft Roll lithium ion cell polar ear, and this lug has solved the leakage problem of Soft Roll lithium ion cell polar ear side by traditional lug is simply processed, and effectively improves the reliability of battery.

(2) technical scheme

For realizing above function, the utility model provides a kind of Soft Roll lithium ion cell polar ear, comprises two films up and down and is clipped in lug metal tape between the described film, and scarf is arranged in the two sides of described lug metal tape.

Preferably, the angle of described lug metal tape side and lug metal tape bottom surface is less than 45 degree.

Further, on the described lug metal tape two sides groove is set.

Preferably, described groove is positioned at hot sealing place of lithium ion battery packing sack.

Preferably, described depth of groove 0.5～1mm.

Preferably, described recess width 3～5mm, flute pitch 6～8mm.

Preferably, described groove is no less than two.

Preferably, described scarf adopts method manufacturings such as grinding, forging and pressing or punching press.

Preferably, described groove adopts the method for grinding manufacturing.

(3) beneficial effect

The Soft Roll lithium ion cell polar ear that the utility model provides, scarf is arranged in lug metal tape two sides, and aluminum plastic film can fit tightly with lug and prevent that electrolyte leakage duct from appearring in the side, effectively alleviates the side leakage of soft-package battery lug during hot sealing;

Further, the utility model lug metal tape two sides arrange groove, especially the lug metal tape two sides that are positioned at hot sealing place arrange some grooves, hot sealing process further groove position forms crooked labyrinth passage, even there is the hot pressing of a small amount of position not tight, electrolyte also is not easy to leak, and guarantees the reliability of battery;

Further, the Soft Roll lithium ion cell polar ear that the utility model provides does not change structure, manufacture process, manufacturing process and the equipment of original battery, only traditional lug metal tape is simply processed, and easy to operate, the cost that increases is very limited;

Further, the Soft Roll lithium ion cell polar ear that the utility model provides can adopt automatic sheet equipment to produce, and realizes the full automation of lug processing, the production efficiency height; Can also utilize the groove that is positioned at hot sealing place lug metal tape both sides to soft-package battery pole piece location, realize the accurate welding at lug position.

Description of drawings

Fig. 1 is the profile of traditional Soft Roll lithium ion battery seal;

Fig. 2 is the schematic diagram of traditional Soft Roll lithium ion cell polar ear metal tape;

Fig. 3 is the schematic diagram of the utility model Soft Roll lithium ion cell polar ear metal tape, only shows scarf and the groove of a side among the figure, and scarf and the groove of opposite side do not show;

Fig. 4 is the right view of the utility model Soft Roll lithium ion cell polar ear metal tape;

Among the figure, 1: the lug metal tape; 2: aluminum plastic film; 3: groove.

Embodiment

Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for explanation the utility model, and unrestricted scope of the present utility model.

As shown in Figure 1, traditional lug has certain thickness, and the Soft Roll lithium ion battery is after packing mouthful (two films belong to prior art about being positioned at the lug metal tape, indicate in the drawings) hot sealing, and there is the duct in lug metal tape 1 both sides, cause solution leakage.

As shown in Figure 3, scarf is arranged in the two sides of the lug metal tape 1 of the Soft Roll lithium ion cell polar ear that the utility model provides, in the two sides of lug metal tape 1 groove 3 is set, preferred, groove 3 is positioned at hot sealing place of Soft Roll lithium ion battery packing sack.

The principle of the utility model technical solution problem is: when the side of lug metal tape was scarf, aluminum plastic film can fit tightly with lug after the hot sealing, prevented that effectively the duct of solution leakage from appearring in the lug side; Be positioned at the hot sealing position in the two sides of lug metal tape groove is set, in the Soft Roll lithium battery hot pressing process, the groove position forms crooked labyrinth passage, even there is a spot of position hot pressing not tight, electrolyte also is not easy to take place leakage, thereby has guaranteed the sealing of lug side.

Scarf all is arranged in the utility model lug metal tape two sides, and this moment, lug metal tape two sides were ramped shaped, and the angle between lug metal tape side and the lug metal tape bottom surface is the slope angle on this slope.In order to guarantee sealing effectiveness, this slope angle is generally less than 45 degree.

As shown in Figure 3, H is depth of groove, and the distance L on groove both sides is recess width, and what two adjacent grooves played initial line is flute pitch apart from S.

Do not have sealing effectiveness when depth of groove H is too small, depth of groove H is big can to influence the battery discharge effect, and generally speaking, depth of groove H is not more than 1mm.In order to reach better sealing effectiveness, depth of groove H is 0.5～1mm, and recess width L is 3～5mm, and flute pitch S is 6～8mm.In order to guarantee better sealing effectiveness, preferred, the groove 3 that lug metal tape two sides are positioned at hot sealing place of Soft Roll lithium ion battery packing sack is no less than 2.

The Soft Roll lithium ion cell polar ear that the utility model provides does not change structure, manufacture process, manufacturing process and the equipment of original battery, just traditional lug metal tape is simply processed, its processing method can adopt wheel grinding, forging and pressing and punching press etc., manufacturing process is simple, easy to operate, and the cost that increases is very limited.

Generally speaking, the grinding on the circular cone emery wheel earlier of lug metal tape, form scarf at lug metal tape dual-side, and then grinding goes out corresponding groove on flat-faced wheel, with the manufacturing of the lug metal tape after the processing for battery pole ear, at last the lug of making is used for the manufacturing of Soft Roll lithium ion battery.

The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and replacement, these improvement and replacement also should be considered as protection range of the present utility model.

Claims

1. Soft Roll lithium ion cell polar ear comprises two films up and down and is clipped in lug metal tape (1) between the described film that it is characterized in that: scarf is arranged in the two sides of described lug metal tape (1).

2. Soft Roll lithium ion cell polar ear according to claim 1 is characterized in that: the angle of described lug metal tape side and lug metal tape bottom surface is less than 45 degree.

3. Soft Roll lithium ion cell polar ear according to claim 1, it is characterized in that: described lug metal tape arranges groove (3) on the two sides.

4. Soft Roll lithium ion cell polar ear according to claim 3 is characterized in that: described groove (3) is positioned at hot sealing place of lithium ion battery packing sack.

5. Soft Roll lithium ion cell polar ear according to claim 3 is characterized in that: described depth of groove 0.5～1mm.

6. Soft Roll lithium ion cell polar ear according to claim 5 is characterized in that: described recess width 3～5mm, flute pitch 6～8mm.

7. Soft Roll lithium ion cell polar ear according to claim 3, it is characterized in that: described groove (3) is no less than two.

8. according to each described Soft Roll lithium ion cell polar ear of claim 1-7, it is characterized in that: described scarf adopts grinding, forging and pressing or process for stamping manufacturing.

9. according to each described Soft Roll lithium ion cell polar ear of claim 3-7, its feature then is: described groove (3) adopts the method for grinding manufacturing.