CN101783402A - Burr removing method for cathode plate of lithium ion battery - Google Patents
Burr removing method for cathode plate of lithium ion battery Download PDFInfo
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- CN101783402A CN101783402A CN200910036707A CN200910036707A CN101783402A CN 101783402 A CN101783402 A CN 101783402A CN 200910036707 A CN200910036707 A CN 200910036707A CN 200910036707 A CN200910036707 A CN 200910036707A CN 101783402 A CN101783402 A CN 101783402A
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- lithium ion
- ion battery
- removing method
- cathode plate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a burr removing method for a cathode plate of a lithium ion battery. The method removes burrs at the cut edge of a cathode current collector through the chemical reaction of alkali substance and aluminum. The method removes the cut burrs of the cathode current collector by a chemical treatment method under the conditions that the edge shape of the cathode plate is not affected and a cathode membrane coat is kept complete; and an isolating membrane between the cathode plate and an anode plate is pierced, and the cathode current collector is not contacted with the anode membrane to form short circuit, so the safety of the lithium ion battery is effectively ensured.
Description
Technical field
The present invention relates to a kind of burr removing method of cathode plate of lithium ion battery.
Background technology
Along with the development of modern society, various mobile devices have all had application more and more widely as video camera, notebook computer, portable DVD player and digital camera etc., and are therefore, also increasing to the demand of high-energy battery.Many outstanding advantages such as lithium ion battery is in light weight because of having, energy storage is big, power is big, pollution-free, life-span long, the self discharge coefficient is little, temperature accommodation is wide in range, be subjected to people's favor gradually, become the optimal power supply of mobile device, even in fields such as Aeronautics and Astronautics, navigation, automobile, Medical Devices, also progressively replaced other conventional batteries.
Generally comprise the battery cell that several superpose successively in the lithium ion battery, each battery cell comprises cathode sheets, barrier film and the anode strip of mutual coiling or stack, wherein, barrier film is interval between the adjacent yin, yang pole piece, play the effect of electronics obstruct, ion conducting, be used to keep electrolyte simultaneously.Cathode sheets comprise cathode current collector that general employing aluminium foil is made and attached on the cathode current collector, contain the diaphragm of cathode active material; Anode strip comprise anode collector that general employing Copper Foil is made and attached on the anode collector, contain the diaphragm of anode active material; Barrier film is the microporous membrane for adopting technologies such as plasticizing, extraction to make then, and such structure helps the maintenance of barrier film to the organic solvent electrolyte that contains lithium salts.When making lithium ion battery, as long as one or more above-mentioned battery cells are made battery, and on the coated outside of battery packing film, in it, inject electrolyte afterwards, through and finding time, seal and get final product.Because the employed electrolyte of lithium ion battery is inflammable organic electrolyte at present, so secondary lithium battery is very high to security requirement.
But, easily in edge produce burr as the cathode sheets of collector when the cutting with aluminium foil, therefore the barrier film that is isolated between the yin, yang pole piece is pierced through by burr sometimes, makes aluminium foil contact and be short-circuited with the anode diaphragm.The battery of short circuit can heat up rapidly, thereby causes inflammable organic electrolyte to catch fire, even causes battery to be blasted.
In view of this, the necessary burr removing method that a kind of cathode plate of lithium ion battery is provided.
Summary of the invention
The objective of the invention is to: the burr removing method that a kind of cathode plate of lithium ion battery is provided.
For solving the problems of the technologies described above, the invention provides a kind of burr removing method of cathode plate of lithium ion battery, its chemical reaction by alkaline matter and aluminium is removed the burr of cathode current collector cut edge.
As a kind of improvement of the burr removing method of cathode plate of lithium ion battery of the present invention, described alkaline matter is NaOH, lithium hydroxide or sodium metasilicate.
As a kind of improvement of the burr removing method of cathode plate of lithium ion battery of the present invention, described alkaline matter be with the form of alkaline processing liquid with as the aluminium foil generation chemical reaction of cathode current collector.
As a kind of improvement of the burr removing method of cathode plate of lithium ion battery of the present invention, the concentration of described alkaline processing liquid is 0.2～5mol/L.
As a kind of improvement of the burr removing method of cathode plate of lithium ion battery of the present invention, described alkaline matter also advances certain depth D with the cut edge etching of cathode current collector in deburring, and etch depth D meets the following conditions: 0＜＜D＜200um.
As a kind of improvement of the burr removing method of cathode plate of lithium ion battery of the present invention, during deburring, described cathode current collector has only the cut edge of 1～5mm to contact with alkaline processing liquid.
A kind of improvement as the burr removing method of cathode plate of lithium ion battery of the present invention, described cathode sheets deburring step is only to carry out at cathode sheets after the cathode sheets cutting finishes, or carries out at battery cell in yin, yang pole piece and barrier film stack or after being wound into battery cell.
As a kind of improvement of the burr removing method of cathode plate of lithium ion battery of the present invention, when before coiling independent cathode sheets being carried out the deburring step, the cut edge of cathode sheets and the contact width of alkaline processing liquid are 2～5mm, and the processing time is no more than 5 minutes.
A kind of improvement as the burr removing method of cathode plate of lithium ion battery of the present invention, when behind coiling, battery cell being carried out the deburring step, the degree of depth that alkaline solution is immersed in the end of battery cell is 1～3mm, processing time is 1～5 minute, cleans the immersion end of battery cell afterwards with cleaning fluid.
A kind of improvement as the burr removing method of cathode plate of lithium ion battery of the present invention, when behind coiling, battery cell being carried out the deburring step, being the alkaline solution that will be emulsion state is sprayed on the pending end face of battery cell in the mode of atomizing spraying, processing time is 5～20 minutes, and the gluey treatment fluid that will solidify is slightly peeled off from the end of battery cell again.
With respect to prior art, the present invention is by chemically treated method, do not influencing the cathode sheets edge shape and keeping under the complete situation of negative electrode diaphragm coating, the cutting burr of cathode current collector is removed, therefore the barrier film between the yin, yang pole piece just can not be punctured yet again, cathode current collector can not contact with the anode diaphragm and be short-circuited, thereby effectively guarantees the safety of lithium ion battery.
Description of drawings
Below in conjunction with accompanying drawing and each embodiment, the present invention and useful technique effect thereof are elaborated, wherein:
Fig. 1 carries out the schematic diagram of flash removed for the method according to this invention target sheet before coiling.
Fig. 2 is the schematic diagram of cathode plate of lithium ion battery, anode strip and the barrier film stack of prior art.
The schematic diagram that Fig. 3 superposes for the cathode sheets using method of the present invention and handled and anode strip and barrier film.
Fig. 4 handles the schematic diagram of the cathode plate of lithium ion battery of having reeled for using infusion method.
Fig. 5 handles the schematic diagram of the cathode plate of lithium ion battery of having reeled for using the atomizing spraying method.
Embodiment
The pole piece preparation process of lithium ion battery generally includes slurrying, films, operations such as drying, die mould, cutting, though the manufacturing process of different vendor or different batteries may change the pole piece cutting operation that all is absolutely necessary to some extent.Because lithium ion battery mostly adopts aluminium foil as cathode current collector, when determining its cutting, the aluminium self characteristics produces burr in edge easily.The lithium ion battery that uses such cathode sheets to make, its barrier film probably can be pierced through by burr, and aluminium foil is contacted and short circuit with the anode diaphragm, so that security incident takes place.In order to address this problem, the present invention removes the burr of cathode sheets cut edge according to the chemical characteristic of aluminium by the mode of chemical reaction, thereby guarantees that the barrier film between the yin, yang pole piece can not punctured by aluminium foil, effectively improves the security performance of lithium ion battery.
The present invention passes through alkaline matter, as the chemical reaction of NaOH, lithium hydroxide, sodium metasilicate etc. and aluminium generation, and the degree of depth that the cut edge etching of cathode current collector is certain, thereby the burr of cut edge can be removed fully.The equation of these alkaline matters and aluminium generation chemical reaction is respectively:
2Al+2NaOH+2H
2O＝2NaAlO
2+3H
2↑；
2Al+2LiOH+2H
2O＝2LiAlO
2+3H
2↑；
2Al+Na
2SiO
3+4H
2O＝2NaAlO
2+H
2SiO
3↓+3H
2↑。
Since above-mentioned alkaline matter not with the negative electrode diaphragm and in cathode active material react, so the deburring process can't cause harmful effect by the target diaphragm.
See also Fig. 1, a step chemistry was set before cathode sheets 20 cuttings finish, reel removes the operation of aluminium foil cut edge.This operation will be cut into the cathode sheets 20 of strip by clamping device 30 cut edge is soaked into and to be handled in the formed treatment fluid 40 of above-mentioned alkaline matter, falls thereby be exposed to the outer aluminium foil corrosion of negative electrode diaphragm after will cut, and the inside certain degree of depth of etching.In order to reduce other Effect on Performance of target sheet 20, the cut edge of cathode sheets 20 has only 2～5mm contact treatment fluid during processing, and infiltrating time is no more than 5 minutes, the concentration of treatment fluid 40 is allocated between 0.2～5mol/L, and concrete numerical value can be determined according to the thickness of reactivity, aluminium foil and the cathode sheets 20 of employing alkali solute.
See also Fig. 2 and Fig. 3, before processing, concordant with the edge of negative electrode diaphragm 240 or protrude in the edge of negative electrode diaphragm 240 a little on the cathode sheets 200 as aluminium foil 220 edges of cathode current collector, therefore after superposeing with barrier film 500 and anode strip 600, the cutting burr of aluminium foil 220 just is easy to puncture barrier film 500, so that contacts with adjacent anode diaphragm 640 and be short-circuited.After processing, the cut edge of aluminium foil 22 and on all etched the removing of burr, the etch depth D of aluminium foil 22 meets the following conditions: 0＜＜D＜200um.Because negative electrode diaphragm 24 does not react with treatment fluid, so this moment aluminium foil 22 be shorter in length than barrier film 50, its edge is in the retraction barrier film 50, and also removal fully of the burr on the aluminium foil 22, therefore the security incident that aluminium foil 22 punctures anode diaphragm 64 contact short circuits of barrier film 50 backs and anode strip 60 can not take place again.And even barrier film 50 is because breakage has taken place other reasons, the aluminium foil 22 in the retraction negative electrode diaphragm 24 also is difficult to touch anode diaphragm 64, and therefore the cathode sheets made from method of the present invention 20 can effectively guarantee the safety of lithium ion battery.
In addition, because other materials in above-mentioned alkaline matter and the battery cell, as barrier film between anode collector, anode diaphragm, anode active material, anode and cathode slice etc., chemical reaction does not take place, or it is very low that Activity of Chemical Reaction takes place, therefore the target sheet 200 chemical flash removed operation of carrying out also can be carried out at the battery cell that anode and cathode slice 200,600 and barrier film 500 stacks or the back of reeling form.
See also Fig. 2 and Fig. 4, form battery cell 80 in back that untreated cathode sheets 200 and anode strip 600 and barrier film 500 are superposeed in certain sequence, reel, then an end of battery cell 80 is put into the 0.2～5mol/L alkaline processing liquid 400 for preparing in advance.Described alkaline processing liquid 400 is to be positioned over a size to be large enough to hold in the container 90 of battery cell 80 ends, in order to prevent that aluminium foil 220 is by over etching, reduce the influence of 400 pairs of battery performances of treatment fluid simultaneously, the height of described treatment fluid 400 in container 90 is 1～3mm, that is to say that the end of battery cell 80 has only 1～3mm to immerse in the alkaline processing liquid 400.Processing time is determined according to the reactivity of concentration, active ingredient and the aluminium of treatment fluid 400, the factors such as thickness of aluminium foil 220, generally was advisable with 1～5 minute.Processed end with battery cell 80 takes out from container handling 90 afterwards, put into cleaning fluid again 1～5 minute, so that clean the unnecessary alkaline processing liquid 400 that removes attachment removal, carry out drying by hot blast drying or other modes then, can finish aluminium foil 220 cut edges of first end and handle.The other end of treatment of battery monomer 80 is finished the aluminium foil 220 cut edges processing to second end of battery cell 80 in the same way.
After aluminium foil 220 was handled through said method, its edge configuration was identical with the edge configuration of the aluminium foil 22 of cathode sheets shown in Fig. 3 20, repeats no more herein.
See also Fig. 5, the aluminium foil edge of the method treatment of battery monomer 800 of all right atomizing spraying of the present invention.Processing procedure is: 0.2～5mol/L treatment fluid, the 401 usefulness atomizing spraying methods that will prepare, be emulsion state are sprayed directly on on the pending end face of battery cell 800, after static 5～20 minutes, the gluey treatment fluid 401 that will solidify is slightly peeled off from the end of battery cell 800 again.Use another pending end face of same way as treatment of battery monomer 800 then.The method can be removed the aluminium foil burrs on edges of cathode sheets equally, simultaneously etching aluminum foil is gone into certain degree of depth, and result is identical with Fig. 3.
In sum, the present invention is by chemically treated method, do not influencing the cathode sheets edge shape and keeping under the complete situation of negative electrode diaphragm coating, the cut edge and the burr of cathode current collector are removed simultaneously, it is also shorter than negative electrode diaphragm as the aluminium foil length of cathode current collector to handle the back, can't be exposed to the cathode sheets edge, therefore can not puncture barrier film again and be short-circuited with the anode diaphragm, even barrier film since the situation of other reasons breakage under, can not contact yet, thereby effectively improve the security performance of lithium ion battery with the anode diaphragm.
Need to prove, though this specification is that example describes the alkaline matter in the present invention's design with NaOH, lithium hydroxide or sodium metasilicate only, but those skilled in the art is according to the announcement of this specification, also can adopt other not influence the cathode sheets edge contour and do not influence the complete alkaline matter of negative electrode diaphragm coating.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although used some specific terms in this specification, these terms do not constitute any restriction to the present invention just for convenience of description.
Claims (10)
1. the burr removing method of a cathode plate of lithium ion battery is characterized in that: the burr of removing the cathode current collector cut edge by the chemical reaction of alkaline matter and aluminium.
2. the burr removing method of cathode plate of lithium ion battery according to claim 1, it is characterized in that: described alkaline matter is NaOH, lithium hydroxide or sodium metasilicate.
3. the burr removing method of cathode plate of lithium ion battery according to claim 2 is characterized in that: described alkaline matter be with the form of alkaline processing liquid with as the aluminium foil generation chemical reaction of cathode current collector.
4. the burr removing method of cathode plate of lithium ion battery according to claim 3, it is characterized in that: the concentration of described alkaline processing liquid is 0.2～5mol/L.
5. according to the burr removing method of any described cathode plate of lithium ion battery in the claim 1 to 4, it is characterized in that: described alkaline matter is in deburring, also certain depth D is advanced in the cut edge etching of cathode current collector, etch depth D meets the following conditions: 0＜＜D＜200um.
6. the burr removing method of cathode plate of lithium ion battery according to claim 5, it is characterized in that: during deburring, described cathode current collector has only the cut edge of 1～5mm to contact with alkaline processing liquid.
7. the burr removing method of cathode plate of lithium ion battery according to claim 6, it is characterized in that: described cathode sheets deburring step is only to carry out at cathode sheets after the cathode sheets cutting finishes, or carries out at battery cell in yin, yang pole piece and barrier film stack or after being wound into battery cell.
8. the burr removing method of cathode plate of lithium ion battery according to claim 7, it is characterized in that: when before coiling, independent cathode sheets being carried out the deburring step, the cut edge of cathode sheets and the contact width of alkaline processing liquid are 2～5mm, and the processing time is no more than 5 minutes.
9. the burr removing method of cathode plate of lithium ion battery according to claim 7, it is characterized in that: when behind coiling, battery cell being carried out the deburring step, the degree of depth that alkaline solution is immersed in the end of battery cell is 1～3mm, processing time is 1～5 minute, cleans the immersion end of battery cell afterwards with cleaning fluid.
10. the burr removing method of cathode plate of lithium ion battery according to claim 9, it is characterized in that: when behind coiling, battery cell being carried out the deburring step, being the alkaline solution that will be emulsion state is sprayed on the pending end face of battery cell in the mode of atomizing spraying, processing time is 5～20 minutes, and the gluey treatment fluid that will solidify is slightly peeled off from the end of battery cell again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910036707A CN101783402A (en) | 2009-01-16 | 2009-01-16 | Burr removing method for cathode plate of lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910036707A CN101783402A (en) | 2009-01-16 | 2009-01-16 | Burr removing method for cathode plate of lithium ion battery |
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| CN101783402A true CN101783402A (en) | 2010-07-21 |
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| CN200910036707A Pending CN101783402A (en) | 2009-01-16 | 2009-01-16 | Burr removing method for cathode plate of lithium ion battery |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903886A (en) * | 2012-08-13 | 2013-01-30 | 南京大学 | Method for removing battery electrode sheet burr by corroding with dry method |
| WO2017035749A1 (en) * | 2015-08-31 | 2017-03-09 | 宁德新能源科技有限公司 | Secondary battery cell and winding formation system thereof |
| CN115036139A (en) * | 2022-05-30 | 2022-09-09 | 西安交通大学 | Aluminum foil burr removing method, aluminum foil and application |
-
2009
- 2009-01-16 CN CN200910036707A patent/CN101783402A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102903886A (en) * | 2012-08-13 | 2013-01-30 | 南京大学 | Method for removing battery electrode sheet burr by corroding with dry method |
| WO2017035749A1 (en) * | 2015-08-31 | 2017-03-09 | 宁德新能源科技有限公司 | Secondary battery cell and winding formation system thereof |
| US11329352B2 (en) | 2015-08-31 | 2022-05-10 | Ningde Amperex Technology Limited | Secondary battery cell and winding formation system thereof |
| CN115036139A (en) * | 2022-05-30 | 2022-09-09 | 西安交通大学 | Aluminum foil burr removing method, aluminum foil and application |
| CN115036139B (en) * | 2022-05-30 | 2023-05-02 | 西安交通大学 | Aluminum foil burr removing method, aluminum foil and application |
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Application publication date: 20100721 |