CN202395109U

CN202395109U - Bottom-encapsulated lithium ion battery roll core

Info

Publication number: CN202395109U
Application number: CN2011205337723U
Authority: CN
Inventors: 朱继涛
Original assignee: SHENZHEN WISEWOD TECHNOLOGY Co Ltd
Current assignee: SHENZHEN WISEWOD TECHNOLOGY Co Ltd
Priority date: 2011-12-19
Filing date: 2011-12-19
Publication date: 2012-08-22
Anticipated expiration: 2021-12-19

Abstract

The utility model relates to a bottom-encapsulated lithium ion battery roll core which comprises a rectangular roll core pole group, wherein two corners at the bottom of the rectangular roll core pole group along the width direction are respectively coated and adhered by a first adhesive tape and a second adhesive tape; and the first adhesive tape and the second adhesive tape round the wall thickness of the roll core pole group and are adhered to two side surfaces at one corner of the bottom of the roll core pole group. The bottom-encapsulated lithium ion battery roll core disclosed by the utility model has the benefits that adhesive tapes at the bottoms of the roll core pole groups of batteries of the greater size are adhered by two times, so that the flatness after adhesion can be improved and the possibility that the battery is in short circuit is reduced. A clearance with a certain width reserved at the bottom of the pole group of the roll core is not adhered, and thus residual electrolyte at the bottom of a casing can be effectively utilized. During use, the electrolyte can be gradually supplemented to the roll core, and thus the cycle performance of the battery is greatly improved and the service life is prolonged; and particularly more remarkable effect for batteries with higher power is achieved.

Description

Bottom encapsulate lithium ion battery coil core

Technical field

The utility model relates to a kind of battery structure, refers in particular to a kind of bottom encapsulate lithium ion battery coil core.

Background technology

Lithium ion battery with its have operating voltage height, energy density big, have extended cycle life, self discharge is little, the advantage of memory-less effect; Be widely used in fields such as mobile phone, notebook computer, PDA, digital camera, MP3, become various modern communication equipment and the indispensable parts of electronic equipment.

Renewal and development along with technology; The development of various power consumption equipments is to the demands for higher performance of battery, require battery have thinner, gentlier, higher energy density and power density and longer useful life, battery is in use usually; It is the main cause that causes the cycle performance of battery rapid deterioration that electrolyte lacks; And generally behind battery liquid-filling, housing bottom is all residual to have certain electrolyte, how the rubber-wrapping structure of Design Treatment volume core utmost point group 1 bottom; Rationally utilize this residual electrolyte, become one of important key link in the lithium ion battery production technology.

At present, there is following shortcoming in the bottom gummed paper structure of existing volume core:

1. because volume core change in size is big, when the size broad, require the length of adhesive tape longer, not easy to operate during rubberizing, be prone to cause gummed paper to crumple, cause the short circuit of volume core;

2. adhesive tape will be rolled up core utmost point group 1 bottom and wrap up fully, cause the electrolyte of housing bottom to absorb through diffusion and by pole piece, reduce the chemical property of battery when using, and also have certain potential safety hazard simultaneously.

The utility model content

The purpose of the utility model is to have overcome above-mentioned defective, provides a kind of and can improve cycle performance of battery, increases the service life, simple and easy to do lithium ion battery coil core utmost point group 1 bottom rubber-wrapping structure.

The purpose of the utility model is achieved in that a kind of bottom encapsulate lithium ion battery coil core, and it comprises rectangle volume core utmost point group, on two jiaos of said volume core utmost point group broad ways bottom respectively bag post first adhesive tape and second adhesive tape; Said first adhesive tape, second adhesive tape are walked around volume core utmost point group wall thickness and are sticked on the face of one jiao of both sides, volume core utmost point group bottom;

In the said structure, first adhesive tape and the second adhesive tape interbody spacer that two jiaos of bags of said volume core utmost point group broad ways bottom paste are formed with the slit;

In the said structure, said slit width 3-8mm;

In the said structure, the long 30%-50% of said first adhesive tape and/or second adhesive tape for volume core utmost point group Width girth;

In the said structure, said first glue and/or the second adhesive tape length exceed volume core utmost point group 4-10mm.

The beneficial effect of the utility model is to than large-sized battery, will roll up core utmost point group bottom adhesive tape and be divided into twice rubberizing, can improve the planarization after the rubberizing, reduction battery short circuit probability.And the not rubberizing of slit of certain width is left in volume core utmost point group bottom; Can effectively utilize the residual electrolyte of housing bottom, in the use, this electrolyte can replenish gradually gives the volume core; Thereby improved the cycle performance of battery greatly; Prolonged useful life, particularly to big electrokinetic cell, its effect is more obvious.

Description of drawings

Concrete structure below in conjunction with detailed description of the drawings the utility model

Fig. 1 is volume core utmost point group rubberizing step 1 sketch map of the utility model;

Fig. 2 is volume core utmost point group rubberizing step 2 sketch map of the utility model;

Fig. 3 is volume core utmost point group rubberizing step 3 sketch map of the utility model.

1-volume core utmost point group; 2-first adhesive tape; 3-second adhesive tape; The 11-face; The 12-wall thickness.

Embodiment

By the technology contents, the structural feature that specify the utility model, realized purpose and effect, know clearly below in conjunction with execution mode and conjunction with figs. and give explanation.

See also Fig. 1-3; The utility model relates to a kind of bottom encapsulate lithium ion battery coil core; It comprises rectangle volume core utmost point group 1; On two jiaos of volume core utmost point group 1 broad ways bottom respectively bag post first adhesive tape 2 and second adhesive tape 3, above-mentioned first adhesive tape 2, second adhesive tape 3 are walked around volume core utmost point group 1 wall thickness 12 and are sticked on the face 11 of rolling up one jiao of both sides, core utmost point group 1 bottom.The first preferable adhesive tape 2 and/or the length of second adhesive tape 3 can be the 30%-50% of volume core utmost point group Width girth; Exceeding volume core utmost point group like common volume core utmost point group 1 first glue and/or the second adhesive tape length can be at 4-10mm; Thus; Common, first

adhesive tape

2 and 3 on second adhesive tape that two jiaos of bags of volume core utmost point group 1 broad ways bottom paste should be formed with wide 3-8mm slit at interval.

Be the bottom encapsulate lithium ion battery coil core of preparation the utility model structure, through realizing through following operating procedure:

1.. like Fig. 1, shear first adhesive tape 2, second adhesive tape 3, sheared length is 30%～50% of volume core utmost point group 1 Width girth;

2. will shear good first adhesive tape, 2 flat jiaos of being bonded at volume core utmost point group 1 bottom; Earlier first adhesive tape, 2 one sides are touched wide an of side of volume core utmost point group 1; First adhesive tape 2 should exceed the about 4～10mm of volume core utmost point group 1 width; Then first adhesive tape 2 is walked around volume core utmost point group 1 wall thickness side, touch wide of the opposite side of volume core utmost point group 1 again;

3. as shown in Figure 2, shear another required sheet second adhesive tape 3, sheared length is similarly 30～50% of volume core utmost point group 1 Width girth;

4. will shear good second adhesive tape, 3 flat another angles that are bonded at volume core utmost point group 1 bottom; With one jiao of first adhesive tape 2 spacing that posts be 3～8mm; Earlier second adhesive tape, 3 one sides are touched wide an of side of volume core utmost point group 1; Second adhesive tape 3 should exceed volume core utmost point group 1 width about 4～10mm, then second adhesive tape 3 is walked around volume core utmost point group wall thickness side, touch wide of the opposite side of volume core again;

5. as shown in Figure 3, be that first adhesive tape 2, second adhesive tape, 3 parcels are accomplished the elevational schematic view that core utmost point group 1 is rolled up in the back.

Adopt the beneficial effect of the bottom encapsulate lithium ion battery coil core of this structure to be:

1.. to than large-sized battery, will roll up core utmost point group 1 bottom adhesive tape and be divided into twice rubberizing, can improve the planarization after the rubberizing, reduction battery short circuit probability;

2.. the not rubberizing of slit of certain width is left in volume core utmost point group 1 bottom; Can effectively utilize the residual electrolyte of housing bottom, in the use, this electrolyte can replenish gradually gives the volume core; Thereby improved the cycle performance of battery greatly; Prolonged useful life, particularly to big electrokinetic cell, its effect is more obvious;

3.. owing to can make effective utilization, can reduce the visible potential potential safety hazard of electrolyte to a certain extent, the fail safe that improves battery to residual electrolyte in the housing.

The above is merely the embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.

Claims

1. bottom encapsulate lithium ion battery coil core, it comprises rectangle volume core utmost point group, it is characterized in that: on two jiaos of said volume core utmost point group broad ways bottom respectively bag post first adhesive tape and second adhesive tape; Said first adhesive tape, second adhesive tape are walked around volume core utmost point group wall thickness and are sticked on the face of one jiao of both sides, volume core utmost point group bottom.

2. bottom as claimed in claim 1 encapsulate lithium ion battery coil core is characterized in that: first adhesive tape and the second adhesive tape interbody spacer that two jiaos of bags of said volume core utmost point group broad ways bottom paste are formed with the slit.

3. bottom as claimed in claim 2 encapsulate lithium ion battery coil core is characterized in that: said slit width 3-8mm.

4. like any described bottom encapsulate lithium ion battery coil core of claim 1-3, it is characterized in that: the long 30%-50% of said first adhesive tape and/or second adhesive tape for volume core utmost point group Width girth.

5. bottom as claimed in claim 4 encapsulate lithium ion battery coil core is characterized in that: said first glue and/or the second adhesive tape length exceed volume core utmost point group 4-10mm.