CN102760863A

CN102760863A - Puncturing process for baseband of lithium ion battery pole pieces

Info

Publication number: CN102760863A
Application number: CN2012102348871A
Authority: CN
Inventors: 甄德瑜; 钟华; 刘昇钢; 徐滔
Original assignee: HUBEI ZHONGNENG LITHIUM TECHNOLOGY CO LTD
Current assignee: HUBEI ZHONGNENG LITHIUM TECHNOLOGY CO LTD
Priority date: 2012-07-09
Filing date: 2012-07-09
Publication date: 2012-10-31

Abstract

The invention relates to a manufacturing process of lithium ion battery pole pieces. The process is characterized by comprising the following steps: an aluminium foil baseband reel is rolled to be even by a first group of rolling shafts; a plurality of holes are formed on the aluminium foil baseband after the rolled aluminium foil is rolled and punctured by a second group of rolling shafts, the diameter of each hole is Phi 0.6mm- Phi 1mm, and the porosity of the baseband reaches 10 percent-30 percent; the rolled and punctured aluminium foil baseband are coated; the aluminium foil is rolled by a third group of rolling shafts again; and finally, the aluminium foil rolled in the step 4 is sliced to obtain the lithium ion battery pole pieces. The invention has the advantages that the consistency of the pole pieces is improved and the consistency of battery products is improved accordingly.

Description

The acanthopore technology of electrodes of lithium-ion batteries base band

Technical field

The present invention relates to a kind ofThe manufacture technology of electrodes of lithium-ion batteries.

Background technology

It is entire cell manufacturing technology core and key that electrodes of lithium-ion batteries is made.Present situation is: in whole pole piece manufacturing process; No matter be slave unit or the consistency that all can't guarantee whole pole piece from technology controlling and process; Particularly the two sides active matter coating of pole piece is made consistency; There is the phenomenon of two sides active matter coating became uneven in the many positions of pole piece, cause the part of positive/negative plate to exist the energy that compares inconsistent, and difference appears in consequently local pole piece charge-discharge cycle relatively; The circulation of the battery degree of depth causes the pole piece part at first " to cave in ", and then entire cell is damaged in succession.Therefore, the raising of pole piece integral uniform property is one of prerequisite of battery consistency raising.

Summary of the invention

The objective of the invention is to overcome the deficiency of prior art and the consistency of improving pole piece is provided, improve the manufacture technology of the conforming electrodes of lithium-ion batteries of battery product.

In order to achieve the above object, technical scheme of the present invention is: a kind of manufacture technology of electrodes of lithium-ion batteries is characterized in that step is following:

Step 1, aluminum foil coil is flattened through first group of roll-in beaming roller, said first group of roll-in axle comprises the first top roll last item and the first lower roll last item, and the said first top roll last item and the first lower roll last item are worked in coordination;

Step 2, through the aluminium foil after the step 1 roll-in behind second group of roll-in axle roll extrusion acanthopore, on aluminium foil, produced several through holes, the diameter range of through hole is Φ 0.6mm～Φ 1mm, the porosity of through hole reaches 10%～30%; Said second group of roll-in axle comprises perverse roller 21 and the rubber rollers of band pin, and perverse roller and the rubber rollers of said band pin worked in coordination;

Step 3, the aluminium foil base band that behind step 2 roll extrusion acanthopore, produces is coated with;

Step 4, the aluminium foil through step 3 is carried out roll-in by the 3rd group of roll-in axle once more, said the 3rd group of roll-in axle comprises the 3rd top roll last item and the 3rd lower roll last item, and said the 3rd top roll last item and the 3rd lower roll last item are worked in coordination;

Step 5, at last the aluminium foil after the roll-in of step 4 institute is carried out slicing treatment, obtain electrodes of lithium-ion batteries.

The linear speed of roller, rubber rollers and aluminium foil that said band pin is perverse is consistent, and the depth of needling on the perverse roller of band pin is at 0.2mm～0.5mm.

The present invention's advantage compared with prior art is: base band acanthopore technology has effectively been improved pole piece two sides active matter coating became uneven and the inconsistent problem of specific energy of the electric weight that caused by the pole piece became uneven; Through hole makes peripheral pole piece two sides active matter coating thickness complementary; Local two single faces of pole piece " are united two into one "; Form the whole battery degree of depth of participating in of the local pole piece of battery and circulate, overcome local two the single face independent loops disadvantages of pole piece, improve the pole piece consistency.

Description of drawings

Fig. 1 is a base band acanthopore operation sketch map;

Fig. 2 is the aluminium foil design sketch behind the perverse hole.

Embodiment

To combine accompanying drawing and embodiment that the present invention is done further detailed description below:

Like Fig. 1, shown in 2, it is a kind of manufacture technology of electrodes of lithium-ion batteries, and characteristics of the present invention are that step is following:

Step 1, aluminum foil coil 4 is smooth through first group of roll-in axle 1 roll-in, said first group of roll-in axle 1 comprises the first top roll last item 11 and the first lower roll last item 12, the said first top roll last item 11 and the first lower roll last item 12 are worked in coordination;

Step 2, through the aluminium foil after the step 1 roll-in behind second group of roll-in axle, 2 roll extrusion acanthopores; Several through holes on aluminium foil, have been produced; The diameter range of through hole is Φ 0.6mm～Φ 1mm, and the porosity of through hole reaches 10%～30%, and porosity is meant that hole area accounts for the percentage of whole area; Said second group of roll-in axle 2 comprises perverse roller 21 and the rubber rollers 22 of band pin, and the perverse roller 21 of said band pin is worked in coordination with rubber rollers 22;

Step 4, the aluminium foil through step 3 is carried out roll-in by the 3rd group of roll-in axle 3 once more, said the 3rd group of roll-in axle 3 comprises the 3rd top roll last item 31 and the 3rd lower roll last item 32, and said the 3rd top roll last item 31 and the 3rd lower roll last item 32 are worked in coordination;

In the present embodiment; The linear speed of roller 21, rubber rollers 22 and aluminium foil that said band pin is perverse is consistent; In process of production, depth of needling should not be too dark, can damage depth of needling on the perverse roller 21 of base band and rubber roller strap so pin at 0.2mm～0.5mm otherwise the acupuncture lift-over is moving.

Claims

1. the manufacture technology of an electrodes of lithium-ion batteries is characterized in that step is following:

Step 1, aluminium foil base band volume (4) is smooth through first group of roll-in axle (1) roll-in; Said first group of roll-in axle (1) comprises the first top roll last item (11) and the first lower roll last item (12), and the said first top roll last item (11) is worked in coordination with the first lower roll last item (12);

Step 2, through the aluminium foil after the step 1 roll-in behind second group of roll-in axle (2) roll extrusion acanthopore, on the aluminium foil base band, produced several holes, the diameter range in hole is Φ 0.6mm～Φ 1mm, the porosity of base band reaches 10%～30%; Said second group of roll-in axle (2) comprises perverse roller (21) and the rubber rollers (22) of band pin, and the perverse roller (21) of said band pin is worked in coordination with rubber rollers (22);

Step 4, the aluminium foil through step 3 is carried out roll-in by the 3rd group of roll-in axle (3) once more; Said the 3rd group of roll-in axle (3) comprises the 3rd top roll last item (31) and the 3rd lower roll last item (32), and said the 3rd top roll last item (31) is worked in coordination with the 3rd lower roll last item (32);

2. the manufacture technology of electrodes of lithium-ion batteries according to claim 1 is characterized in that the linear speed of the perverse roller (21) of said band pin, rubber rollers (22) and aluminium foil is consistent, and the depth of needling on the perverse roller (21) of band pin is at 0.2mm～0.5mm.