CN109888171A - The processing method of battery anode slice - Google Patents
The processing method of battery anode slice Download PDFInfo
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- CN109888171A CN109888171A CN201910089962.1A CN201910089962A CN109888171A CN 109888171 A CN109888171 A CN 109888171A CN 201910089962 A CN201910089962 A CN 201910089962A CN 109888171 A CN109888171 A CN 109888171A
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- corona treatment
- sided corona
- positive plate
- processing method
- battery anode
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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 present invention provides a kind of processing method of battery anode slice, including will include that the anode sizing agent of positive active material is set on plus plate current-collecting body, it be dried successively to carry out cold pressing treatment and sided corona treatment after positive plate.By positive plate through carrying out sided corona treatment after cold pressing treatment, it is thus smaller for the thickness effect of positive plate, and the chemical bond rupture of the molecular structure on positive plate surface can be made by sided corona treatment or rearranged, increase pole piece roughness, it is easier to the infiltration and diffusion of positive plate surface electrolyte, to shorten the fluid injection time, production efficiency is greatly improved, and the spark discharge effect in sided corona treatment can change the functional group of the particle surface in pole piece, further improve electrolyte and the wetting efficiency on positive plate surface, simultaneously, since the gases such as ozone can be generated during sided corona treatment, ozone can make positive plate surface portion material oxidation, generate the stronger group of polarity, it can to improve its surface, further improve the wetting efficiency of electrolyte Yu positive plate surface.
Description
Technical field
The present invention relates to secondary cell field more particularly to a kind of processing for the battery anode slice for improving battery core fluid injection efficiency
Method.
Background technique
Green high-capacity rechargeable battery of the secondary cell as latest generation, in portable electronic product, electronic toy, electronic
The fields such as the vehicles, large-sized power power supply and energy storage are developed rapidly.And electrolyte is one to hold the balance in battery
Part plays the role of conducting ion between secondary cell positive and negative electrode, is the carrier of ion transmission, is secondary ion electricity
Pond obtains the guarantee of the advantages that high voltage, high specific energy.As more and more positive and negative pole materials are packed into battery, electrolyte content
It increases therewith, therefore the imbibition efficiency of battery core becomes a big problem, at present problem appear to is that fluid injection overlong time, causes to produce
Efficiency reduces.
Current fluid injection mode is usually vacuum pumping liquid injection, needs to stand so that electrolyte and battery plus-negative plate for a long time
Material and isolation film sufficiently infiltrate.But the wetting capacity of anode pole piece is poor, especially lithium iron phosphate positive material, needs after fluid injection
The infiltrating time wanted is longer, if thus without sufficiently infiltrating electrolyte easily occur overflow, not only pollute battery core, but also influence close
Nail welding is sealed, production efficiency is caused to decline.
Summary of the invention
The object of the present invention is to provide a kind of processing methods of battery anode slice, and electrolyte can be improved in anode pole piece
Wetting capacity, thus make the fluid injection time shorten, fluid injection efficiency improve.
To achieve the above object, the present invention provides a kind of processing methods of battery anode slice, including will include positive work
The anode sizing agent of property substance is set on plus plate current-collecting body, is dried successively to carry out at cold pressing treatment and corona after positive plate
Reason.
Positive plate is carried out sided corona treatment after cold pressing treatment by the present invention, thus for the thickness effect of positive plate compared with
It is small, and the chemical bond rupture of the molecular structure on positive plate surface can be made by sided corona treatment or rearranged, keep pole piece thick
Rugosity increases, it is easier to and production efficiency is greatly improved to shorten the fluid injection time in the infiltration and diffusion of positive plate surface electrolyte,
And the spark discharge effect in sided corona treatment can change the functional group of the particle surface in positive plate, further make
Electrolyte and the wetting efficiency on positive plate surface improve, simultaneously as can generate the gases such as ozone, ozone during sided corona treatment
It is a kind of strong oxidizer, positive plate surface portion material oxidation can be made, the stronger group of polarity is generated, to improve its surface
Can, the wetting efficiency of electrolyte Yu positive plate surface is further improved, the electrolyte reduced in injection process overflows, and reduces
The burst point ratio of battery core sealing nail welding is greatly lowered in pollution of the electrolyte to battery core.
Further, including will include that the anode sizing agent of positive active material is set on plus plate current-collecting body as will be by described
The anode sizing agent of positive active material, conductive agent and binder composition is coated on the plus plate current-collecting body.Positive active material
It can be the systems positive electrodes such as LiFePO4, cobalt acid lithium, LiMn2O4, lithium nickelate, nickle cobalt lithium manganate, nickel cobalt lithium aluminate, preferably
LiFePO4 based material is specifically LiFePO4, LiFePO4 dopant material, LiFePO4 covering material.Conductive agent can be
Carbon nanotube, gas phase carbon fiber, conductive black.Binder can be polyacrylic acid, Kynoar, polytetrafluoroethylene (PTFE), butylbenzene rubber
Glue, hydroxypropyl methyl cellulose, carboxymethyl cellulose.And the weight percent of positive active material is 95~99% in slurry,
Binder is 0.5~2%, and conductive agent is 0.5~3%.Existing conventional techniques progress can be used in dry and cold pressing, is such as dried
It can be carried out under conditions of 50~130 DEG C of 6~10min of oven for baking, common cold pressing device can be used in cold pressing, and is cold-pressed
Later, 1~2.5g/cc can be improved in positive bulk density, and positive plate thickness can be compressed to the 40~70% of original depth.Collector
It can be aluminium foil, copper foil or various Punching steel strips.
Further, the sided corona treatment is to be handled using corona machine.Power when corona machine processing is 0.1
~30kw, speed are 1~80m/min, when sided corona treatment tension that is subject to of the positive plate be 5~300N, the corona
Machine is equipped with exhaust pipe, and the gases such as ozone extra in corona machine can be discharged to avoid because gas is excessive by exhaust pipe
And interference is generated to the sided corona treatment of positive plate.
It further, include winding processing after the sided corona treatment, the winding processing, the sided corona treatment and described
Cold pressing treatment synchronizes progress and speed is consistent, and the rolling-up mechanism for winding processing uses the insulation reel such as rubber, alternatively, the electricity
First progress winding for the first time, which is handled and placed, before dizzy processing carries out unreeling after a certain period of time processing, goes back after the sided corona treatment
It is handled including second of winding, the first time winding handles progress synchronous with the cold pressing treatment and speed is consistent, described to put
Volume processing, second of winding processing progress synchronous with the sided corona treatment and speed are consistent, in this way can basis
Actual needs and select carry out sided corona treatment opportunity, i.e., certain time according to the actual situation depending on, and second of winding handle
Rolling-up mechanism insulated reel using rubber etc..
Detailed description of the invention
Fig. 1 is the equipment flowsheet that the battery anode slice of embodiment 1 is handled.
Fig. 2 is the equipment flowsheet that the battery anode slice of embodiment 2 is handled.
Specific embodiment
Below by specific embodiment to further illustrate the technical scheme of the present invention, but do not constitute to of the invention any
It limits, raw material involved in the present embodiment is all commercially available product.
Embodiment 1
Anode sizing agent are as follows: weight percent is 97% carbon-coated LiFePO 4 for lithium ion batteries, 1% butadiene-styrene rubber (SBR), 1%
Carboxymethyl cellulose (CMC) and 1% conductive black.
Above-mentioned anode sizing agent is coated on the two-sided of aluminium foil, and toasts 10min at 85 DEG C in oven, in as shown in Figure 1
Cold press 1 on carry out cold pressing treatment positive bulk density made to improve 1.5g/cc, positive plate thickness can be compressed to original depth
60%, and carry out sided corona treatment using corona machine 2, the power when processing of corona machine 2 is 20kw, speed 70m/min, at corona
The tension that positive plate is subject to when reason is 200N, carries out pumping process to the exhaust pipe of corona machine 2 while sided corona treatment, and adopt
Winding processing is carried out with rolling-up mechanism 3, rolling-up mechanism 3 uses rubber reel, and winding processing, cold pressing treatment are synchronous with sided corona treatment
It carries out and speed is unanimously all 70m/min.
Embodiment 2
Anode sizing agent are as follows: weight percent is 97% carbon-coated LiFePO 4 for lithium ion batteries, 1% butadiene-styrene rubber (SBR), 1%
Carboxymethyl cellulose (CMC) and 1% conductive black.
Above-mentioned anode sizing agent is coated on the two-sided of aluminium foil, and toasts 10min at 85 DEG C in oven, in as shown in Figure 2
Cold press 1 on carry out cold pressing positive bulk density made to improve 1.5g/cc, positive plate thickness can be compressed to original depth
60%, and first time winding processing is carried out to anode pole piece using retractable volume mechanism 4, placement carries out unreeling place after a certain period of time
Reason carries out sided corona treatment using corona machine 2, and the power when processing of corona machine 2 is 20kw, speed 70m/min, when sided corona treatment
The tension that positive plate is subject to is 200N, and carries out second of winding processing using rolling-up mechanism 3, wherein first time winding processing
Progress synchronous with cold pressing treatment and speed is consistent, unreels that processing, second winding processing are synchronous with sided corona treatment to be carried out and speed
Unanimously, the reel of rolling-up mechanism 3 is rubber reel.
Comparative example 1
Anode sizing agent are as follows: weight percent is 97% carbon-coated LiFePO 4 for lithium ion batteries, 1% butadiene-styrene rubber (SBR), 1%
Carboxymethyl cellulose (CMC) and 1% conductive black.
Above-mentioned anode sizing agent is coated on the two-sided of aluminium foil, and toasts 10min at 85 DEG C in oven, it is enterprising in cold press
Row cold pressing makes positive bulk density improve 1.5g/cc, and positive plate thickness can be compressed to the 60% of original depth, and rubber is used after cold pressing
Film tube is wound, rolling speed 70m/min, tension 200N.
Examples 1 to 2 and comparative example 1 treated positive plate are subjected to wellability test and expansion according to following test methods
Property test is dissipated, the results show that the positive plate of Examples 1 to 2 processing can be improved relative to the diffusion velocity of the electrolyte of comparative example 1
45~50%, wetting velocity can be improved 65% or so relative to comparative example 1.
Wellability test: taking 3 embodiment and comparative example samples respectively, is 23 ± 2 DEG C in temperature, humidity is 40% condition
Under, equivalent electrolyte of the same race is dripped on pole piece in the same way, record electrolyte is completely immersed in the average time of pole piece.
Diffusivity test: taking 3 embodiment and comparative example samples respectively, is 23 ± 2 DEG C in temperature, humidity is 40% condition
Under, equivalent electrolyte of the same race is dripped on pole piece in the same way, record electrolyte is completely immersed in the average straight of the marking after pole piece
Diameter.
It should be pointed out that embodiments above is only illustrative of the invention and is not intended to limit the scope of the invention, readding
After having read the present invention, modification of the those skilled in the art to various equivalent forms of the invention, such as drying condition, corona item
The modification of the parameters such as part, winding condition each falls within present invention range defined in the appended claims.
Claims (9)
1. a kind of processing method of battery anode slice, which is characterized in that including will include that the anode sizing agent of positive active material is set
It is placed on plus plate current-collecting body, is dried successively to carry out cold pressing treatment and sided corona treatment after positive plate.
2. the processing method of battery anode slice according to claim 1, which is characterized in that including that will include positive electrode active material
The anode sizing agent of matter is set to the anode on plus plate current-collecting body will to be made of the positive active material, conductive agent and binder
Slurry is coated on the plus plate current-collecting body.
3. the processing method of battery anode slice according to claim 1, which is characterized in that the condition of the drying process is
In 50~130 DEG C of 6~10min of oven for baking.
4. the processing method of battery anode slice according to claim 1, which is characterized in that the sided corona treatment is using electricity
It is airsick to be handled.
5. the processing method of battery anode slice according to claim 4, which is characterized in that function when corona machine processing
Rate is 0.1~30kw, and speed is 1~80m/min.
6. the processing method of battery anode slice according to claim 4, which is characterized in that when the sided corona treatment it is described just
The tension that pole piece is subject to is 5~300N.
7. the processing method of battery anode slice according to claim 5, which is characterized in that include after the sided corona treatment
Winding processing, the winding processing, sided corona treatment progress synchronous with the cold pressing treatment and speed are consistent.
8. the processing method of battery anode slice according to claim 5, which is characterized in that advanced before the sided corona treatment
Row winding for the first time, which is handled and placed, carries out unreeling after a certain period of time processing, further includes second of winding after the sided corona treatment
Processing, the first time winding handles progress synchronous with the cold pressing treatment and speed is consistent, described to unreel processing, described second
Secondary winding handles progress synchronous with the sided corona treatment and speed is consistent.
9. the processing method of battery anode slice according to claim 4, which is characterized in that the corona machine is equipped with exhaust
Pipeline.
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| CN201910089962.1A CN109888171A (en) | 2019-01-29 | 2019-01-29 | The processing method of battery anode slice |
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| CN201910089962.1A CN109888171A (en) | 2019-01-29 | 2019-01-29 | The processing method of battery anode slice |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474016A (en) * | 2019-08-01 | 2019-11-19 | 深圳市比克动力电池有限公司 | A kind of flexible method of improvement positive plate, positive plate and lithium ion battery |
| CN112531173A (en) * | 2019-09-17 | 2021-03-19 | 宁德新能源科技有限公司 | Metal foil treatment process, electrode plate and electrochemical device |
| WO2023130910A1 (en) * | 2022-01-04 | 2023-07-13 | 宁德时代新能源科技股份有限公司 | Battery electrode sheet manufacturing method, battery electrode sheet, and secondary battery |
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| CN110474016A (en) * | 2019-08-01 | 2019-11-19 | 深圳市比克动力电池有限公司 | A kind of flexible method of improvement positive plate, positive plate and lithium ion battery |
| CN112531173A (en) * | 2019-09-17 | 2021-03-19 | 宁德新能源科技有限公司 | Metal foil treatment process, electrode plate and electrochemical device |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20220208 Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zhengli new energy battery technology Co.,Ltd. Address before: 210000 249 Lantian Road, Airport Economic Development Zone, Jiangning District, Nanjing City, Jiangsu Province Applicant before: JIANGSU TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: DONGGUAN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. Applicant before: SHENZHEN TAFEL NEW ENERGY TECHNOLOGY Co.,Ltd. |
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Application publication date: 20190614 |
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