CN100449824C - Battery pole piece and manufacturing method of lithium ion secordary battery containing the pole piece - Google Patents
Battery pole piece and manufacturing method of lithium ion secordary battery containing the pole piece Download PDFInfo
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- CN100449824C CN100449824C CNB2005101143817A CN200510114381A CN100449824C CN 100449824 C CN100449824 C CN 100449824C CN B2005101143817 A CNB2005101143817 A CN B2005101143817A CN 200510114381 A CN200510114381 A CN 200510114381A CN 100449824 C CN100449824 C CN 100449824C
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
A method for preparing pole piece of Li ion cell includes coating size with active material on collector body, drying said collector body then carrying out multiple time of extension-press on said collector body. The Li ion cell equipped with prepared pole piece has narrow scope of volume distribution and excellent stability of circulation property.
Description
Technical field
The invention relates to the preparation method of the battery of a kind of battery pole piece and this pole piece of employing, more specifically say so about the preparation method of a kind of battery pole piece with the lithium rechargeable battery that adopts this pole piece.
Background technology
In recent years, the high-tech electronics industrial expansion can provide the electronic equipment of miniaturization, lightweight, thus make portable electric appts use more and more widely.Lithium rechargeable battery is with its discharge voltage height, energy density height and recycle the first-selected energy that long advantage of life-span becomes these portable electric appts.
Yet when using lithium ion battery, people usually can find: though manufacturer, the on all four battery of model, service time of each battery and recycle the life-span and have very big difference.It is wide that this has just embodied the battery capacity distribution that comes out in the actual production, the unsettled shortcoming of cycle performance.
In the manufacturing process of lithium ion battery, the preparation method of pole piece comprises that the slurry that will contain positive active material, conductive agent and anodal adhesive and solvent or negative electrode active material and negative pole adhesive and solvent applies and/or is filled on the collector body, drying, calendering obtains the negative or positive electrode pole piece.Traditional pole piece calendering technology is the disposable thickness that pole piece is pressed into the technological standards regulation.Find in process of production, the battery that the pole piece that employing is prepared by traditional pole piece calendering technology makes, the capacity skewness, distribution is very wide, and the cycle performance of battery alternates betwwen good and bad unstable product quality.
Summary of the invention
The present inventor finds by experimental study, bigger in the pole piece that adopts traditional disposable technology that pole piece is pressed into the technological standards specific thickness to obtain volumetric expansion in the process of baking drying, there is the potential safety hazard of blast in the battery swell that causes pole piece thus to make.In addition, a traditional calendering technology also might be owing to the excessive destruction that causes negative or positive electrode material granule internal structure of pressure when rolling, thereby reduce the utilance of material, cause the battery initial capacity lower, and internal resistance raises and to speed up in the cyclic process of battery, battery recycle the lost of life.
The capacity distribution that the objective of the invention is to overcome the lithium ion battery that employing obtains by the pole piece of existing method preparation is wide, the unsettled defective of cycle performance, have narrow capacity and distribute and provide a kind of, and the pole piece of the good and stable lithium ion battery of cycle performance and contain the preparation method of the lithium ion battery of this pole piece.
The preparation method of electrodes of lithium-ion batteries provided by the invention comprise will contain the slurry of active material apply and/or be filled on the collector body, drying, calendering, wherein, the number of times of described calendering is for repeatedly.
The preparation method of lithium ion battery provided by the invention comprises positive pole and the negative pole for preparing this battery, and with positive pole, negative pole and barrier film are prepared into pole piece, the pole piece and the electrolyte that obtain are sealed in the battery case, the preparation method of described positive pole and negative pole comprises and will contain positive active material, the slurry of conductive agent and anodal adhesive and solvent applies and/or is filled on the collector body, and the slurry that will contain negative electrode active material and negative pole adhesive and solvent applies and/or is filled on the collector body, dry, to the dried positive active material that contains, the collector body of conductive agent and anodal adhesive and contain negative electrode active material and the collector body of negative pole adhesive rolls, wherein, to the dried positive active material that contains, the collector body of conductive agent and anodal adhesive and contain negative electrode active material and the collector body of negative pole adhesive at least one the number of times of calendering for repeatedly.
What the preparation method of pole piece provided by the invention adopted is the technology that pole piece is repeatedly rolled, according to a specific embodiment of the present invention, for pole piece being carried out the secondary calendering, the certain external force that is applied when rolling for the first time helps the slip of negative or positive electrode material granule, makes the material granule regular purpose of arranging to reach; Calendering is further to apply external force on material granule is arranged regular basis for the second time, to dwindle the space that forms between the particle, makes material reach bigger bulk density.Adopt the thickness swelling of the lithium rechargeable battery of the pole piece preparation of the calendering process compacting of " on a small quantity repeatedly " so less, the bulk density homogeneous of material, battery capacity narrow distribution range and stable cycle performance.
Embodiment
According to the preparation method of lithium rechargeable battery pole piece provided by the invention, this method comprises the slurry coating that will contain active material and/or is filled on the collector body drying, calendering, wherein, the number of times of described calendering is for repeatedly, under the preferable case, the number of times of described calendering is twice.When the preparation anode pole piece, the described slurry that contains active material is the slurry that contains positive active material, conductive agent and anodal adhesive and solvent; When the preparation cathode pole piece, the described slurry that contains active material is the slurry that contains negative electrode active material and negative pole adhesive and solvent.
After the calendering, the variable quantity of pole piece thickness is the 10-50% of pole piece varied in thickness total amount, is preferably 10-40% for the first time; After at least once calendering of carrying out after calendering is finished for the first time, the variable quantity of pole piece thickness is the 50-90% of pole piece varied in thickness total amount, is preferably 60-90%, preferably after calendering is finished for the first time, once rolls.
If use:
Δ d1 represents the variable quantity of calendering back pole piece thickness for the first time;
Δ d2 is illustrated in the variable quantity of at least once calendering back pole piece thickness that carries out after calendering is finished for the first time, and preferred expression is the variable quantity of calendering back pole piece thickness for the second time;
Δ d represents the variation total amount of pole piece thickness, then Δ d=Δ d1+ Δ d2.
So, can be with following formulate:
Δ d1/ Δ d=10-50% is preferably 10-40%;
Δ d2/ Δ d=50-90% is preferably 60-90%.
When rolling for the first time, the certain external force that is applied helps the slip of material granule, reaches the regular purpose of arranging; The purpose of after the calendering pole piece being rolled is further to apply external force on particle is arranged regular basis for the first time, to dwindle the space that forms between the particle, makes material reach bigger bulk density.Adopt the thickness swelling of the lithium rechargeable battery of the pole piece preparation of the tabletting method compacting of " on a small quantity repeatedly " so less, material volume density homogeneous, the narrower and stable cycle performance of battery capacity distribution.
The preparation method of lithium ion battery provided by the invention comprises positive pole and the negative pole for preparing this battery, and with positive pole, negative pole and barrier film are prepared into pole piece, the pole piece and the electrolyte that obtain are sealed in the battery case, the preparation method of described positive pole and negative pole comprises and will contain positive active material, the slurry of conductive agent and anodal adhesive and solvent applies and/or is filled on the collector body, and the slurry that will contain negative electrode active material and negative pole adhesive and solvent applies and/or is filled on the collector body, dry, to the dried positive active material that contains, the collector body of conductive agent and anodal adhesive and contain negative electrode active material and the collector body of negative pole adhesive rolls, wherein, to the dried positive active material that contains, the collector body of conductive agent and anodal adhesive and contain negative electrode active material and the collector body of negative pole adhesive at least one the number of times of calendering for repeatedly, the number of times of described calendering is preferably twice.
Under the preferable case, contain the collector body of positive active material, conductive agent and anodal adhesive and contain negative electrode active material and the number of times of the calendering of the collector body of negative pole adhesive is repeatedly dried, the number of times of described calendering preferably is twice.
After the calendering, the variable quantity of pole piece thickness is the 10-50% of pole piece varied in thickness total amount, is preferably 10-40% for the first time; After at least once calendering of carrying out after calendering is finished for the first time, the variable quantity of pole piece thickness is the 50-90% of pole piece varied in thickness total amount, is preferably 60-90%; Preferably after calendering is finished for the first time, once roll.
According to the preparation method of pole piece provided by the invention, consisting of of described positive pole is conventionally known to one of skill in the art.In general, positive pole comprises collector body and coating and/or is filled in the slurry that contains positive electrode and solvent on the collector body that described positive electrode comprises positive active material, conductive agent and anodal adhesive.
Described positive active material is not particularly limited, and can be preferably a kind of or its mixture: the Li in the following material for the positive active material of the embedded removal lithium embedded of this area routine
xNi
1-yCoO
2(wherein, 0.9≤x≤1.1 ,≤y≤1.0), Li
1+aMbMn
2-bO
4(wherein ,-0.1≤a≤0.2,0≤b≤1.0, M is a kind of in lithium, boron, magnesium, aluminium, titanium, chromium, iron, cobalt, nickel, copper, zinc, gallium, yttrium, fluorine, iodine, the element sulphur), Li
mMn
2-nB
nO
2(wherein, B is a transition metal, 0.9≤m≤1.1,0≤n≤1.0).
Described conductive agent is not particularly limited, can be the anodal conductive agent of this area routine, such as the ketjen carbon black, acetylene black, furnace black, carbon fiber VGCF, in nano-graphite, graphite and the electrically conductive graphite one or more, weight with positive active material is benchmark, and the content of described conductive agent is 0.01-20 weight %, is preferably 0.5-10 weight %.
The kind of described anodal adhesive and content are conventionally known to one of skill in the art, for example one or more in fluorine resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), the butadiene-styrene rubber (SBR).In general, according to the difference of used anodal adhesive kind, be benchmark with the weight of positive active material, the content of anodal adhesive is 0.5-8 weight %, is preferably 1-5 weight %.
Positive electrode collector can be positive electrode collector conventional in the lithium ion battery, uses aluminium foil as positive electrode collector in specific embodiments of the present invention.
Described solvent can be selected from one or more in N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMS0), oxolane (THF) and water and the alcohols; The consumption of solvent can make described pastel have viscosity and flowability, can be coated on the described collector body to get final product.In general, be benchmark with the weight of positive active material, the content 20-70 weight % of described solvent is preferably 30-60 weight %, and wherein, dry method and condition are conventionally known to one of skill in the art.
Described barrier film is arranged between positive pole and the negative pole, and it has electrical insulation capability and liquid retainability energy, and described pole piece and nonaqueous electrolytic solution are contained in the battery case together.Described barrier film can be selected from various barrier films used in the lithium ion battery, as the high molecular polymer microporous membrane, comprises polypropylene microporous membrane and polypropylene and poly MULTILAYER COMPOSITE microporous membrane.The position of described barrier film, character and kind are conventionally known to one of skill in the art.
According to the preparation method of pole piece provided by the invention, consisting of of described negative pole is conventionally known to one of skill in the art.In general, negative pole comprises collector body and coating and/or is filled in negative material on the collector body and the slurry of solvent that described negative material comprises negative electrode active material and negative pole adhesive.
Described negative electrode active material is not particularly limited, can use embedding of this area routine to disengage the negative electrode active material of lithium, such as in native graphite, Delanium, petroleum coke, organic cracking carbon, carbonaceous mesophase spherules, carbon fiber, ashbury metal, the silicon alloy one or more, preferred electrographite.
The kind of described negative pole adhesive and content are conventionally known to one of skill in the art, for example one or more in fluorine resin and polyolefin compound such as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), the butadiene-styrene rubber (SBR); In general, according to the difference of adhesive therefor kind, be benchmark with the weight of negative electrode active material, the content of negative pole adhesive is 0.01-10 weight %, is preferably 0.02-8 weight %.
Described negative material can also comprise conductive agent, and described conductive agent is not particularly limited, and can be the cathode conductive agent of this area routine, such as in ketjen carbon black, acetylene black, furnace black, carbon fiber VGCF, conductive carbon black and the electrically conductive graphite one or more.Weight with negative electrode active material is benchmark, and the content of described conductive agent is 1-15 weight %, is preferably 2-10 weight %.
Negative electrode collector can be for negative electrode collector conventional in the lithium ion battery, as stamped metal, and metal forming, net metal, foamed metal uses Copper Foil as negative electrode collector in specific embodiments of the present invention.
Described solvent can be selected from one or more in N-methyl pyrrolidone (NMP), dimethyl formamide (DMF), diethylformamide (DEF), dimethyl sulfoxide (DMSO) (DMSO), oxolane (THF) and water and the alcohols; The consumption of solvent can make described pastel have viscosity and flowability, can be coated on the described collector body to get final product.In general, be benchmark with the weight of negative electrode active material, the consumption of described solvent is 100-150%.Wherein, Gan Zao method and condition are conventionally known to one of skill in the art.
According to the preparation method of lithium rechargeable battery provided by the invention, wherein, described nonaqueous electrolytic solution is the mixed solution of electrolyte lithium salt and nonaqueous solvents, and it is not particularly limited, and can use the nonaqueous electrolytic solution of this area routine.Be selected from lithium hexafluoro phosphate (LiPF such as electrolyte lithium salt
6), in lithium perchlorate, LiBF4, hexafluoroarsenate lithium, lithium halide, chlorine lithium aluminate and the fluorocarbon based sulfonic acid lithium one or more.Organic solvent is selected chain acid esters and ring-type acid esters mixed solution for use, wherein the chain acid esters can be dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first propyl ester (MPC), dipropyl carbonate (DPC) and other are fluorine-containing, sulfur-bearing or contain at least a in the chain organosilane ester of unsaturated bond, the ring-type acid esters can be ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton (γ-BL), sultone and other are fluorine-containing, sulfur-bearing or contain at least a in the ring-type organosilane ester of unsaturated bond.The injection rate of electrolyte is generally 1.5-4.9g/Ah, the concentration of electrolyte be generally 0.5-2.9 rub/liter.
According to the preparation method of lithium ion battery provided by the invention, except described positive pole and cathode pole piece according to the method preparation provided by the invention, other step is conventionally known to one of skill in the art.In general,, pole piece and the electrolyte that obtains is sealed in the battery case, can obtains lithium ion battery provided by the invention the described positive pole for preparing and negative pole and pole piece of barrier film formation.
To the present invention be described in more detail by embodiment below.
Embodiment 1
Present embodiment is used to illustrate the preparation method of lithium rechargeable battery provided by the invention.
(1) Zheng Ji preparation
With the anodal active component LiCoO of 100 grams
2, 5 gram adhesive polyvinylidene fluoride, 5 gram conductive agent acetylene blacks join in the 50 gram N-methyl pyrrolidones, in mixer, stir then and form uniform anode sizing agent.
Be to carry out double spread equably on 20 microns the aluminium foil with this slurry, under 150 ℃, dry, cut and obtain being of a size of 355 * 41.5 * 0.205 millimeter anode pole piece at thickness.Carry out roll-in afterwards again, Δ d1/ Δ d=10% after the roll-in for the first time, Δ d2/ Δ d=90% after the roll-in for the second time; Obtain thickness and be 0.145 millimeter anode pole piece.Wherein contain 5.9 gram active component LiCoO
2
(2) preparation of negative pole
100 gram negative electrode active composition native graphites, 6 gram adhesive polyvinylidene fluoride are joined in the 100 gram N-methyl pyrrolidones, in mixer, stir and form uniform cathode size.
Be to carry out double spread equably on 12 microns the Copper Foil with this slurry, under 90 ℃, dry, cut and obtain being of a size of 325 * 42.5 * 0.210 millimeter cathode pole piece at thickness.Carry out roll-in afterwards again, Δ d1/ Δ d=10% after the roll-in for the first time, Δ d2/ Δ d=90% after the roll-in for the second time.Obtain thickness and be 0.137 millimeter cathode pole piece.Wherein contain 2.6 gram active component native graphites.
(3) assembling of battery
Above-mentioned positive and negative electrode and three layers of diaphragm material of PP/PE/PP are wound into the pole piece of a square shaped lithium ion secondary battery, subsequently with LiPF
6Concentration by 1 mol is dissolved in EC/DMC=1: form nonaqueous electrolytic solution in 1 the mixed solvent, this electrolyte is injected battery case with the amount of 3.8g/Ah, the square aluminum case lithium ion secondary cell 043048A1-A3 that is of a size of 48 * 30 * 4.5 millimeters is made in sealing.The design capacity of the lithium ion battery of the present invention's preparation is 750mAh.
Embodiment 2-5
Present embodiment is used to illustrate the preparation method of lithium rechargeable battery provided by the invention.
Method according to embodiment 1 prepares battery pole piece and battery, different is, anodal and cathode pole piece are being carried out in the roll-in process, change the changing value Δ d1 and the Δ d2 of pole piece thickness in once calendering and the secondary calender line respectively, make that the value of Δ d1/ Δ d is respectively 20% after calendering for the first time, 30%, 40%, 50%; The value of calendering back Δ d2/ Δ d is respectively 80%, 70%, 60%, 50% for the second time.Prepare the square aluminum case lithium ion secondary cell 043048A4-A6 that is of a size of 48 * 30 * 4.5 millimeters respectively, 043048A7-A9,043048A10-A12,043048A13-A15.
Comparative Examples 1
This Comparative Examples is used to illustrate the preparation method of reference cell.
Method according to embodiment 1 prepares lithium rechargeable battery pole piece and battery, and different is, anodal and cathode pole piece are being carried out in the process of roll-in, pole piece is once rolled.Obtain reference cell AC1-AC3.
Embodiment 6-10
The following example is measured the cycle performance of the lithium ion battery A1-A15 that embodiment 1-5 makes respectively.
At ambient temperature, with battery respectively with the 750mA current charges to 4.2V, with constant-potential charge, cut-off current is 0.05C after voltage rises to 4.2V, shelves 10 minutes; Battery, was shelved 5 minutes to 3.0V with the 750mA current discharge.Repeat above step, record when the capacity of battery drop to its initial capacity 80% the time the cycle-index of process.
The result is as shown in table 1.
Comparative Examples 2
The cycle performance of the reference lithium ion battery AC1-AC3 that this Comparative Examples explanation mensuration Comparative Examples 1 makes.
Adopt the method identical with embodiment 6-10 to measure, different is that the battery of measuring is reference lithium ion battery AC1-AC3.
The result is as shown in table 1.
Table 1
As can be seen from Table 1, adopt the battery of the pole piece preparation that obtains according to the method that pole piece is repeatedly rolled provided by the invention, capacity all reaches the design capacity of battery, and the narrow distribution range of battery capacity.When battery capacity be reduced to the battery initial capacity 80% the time, the cycle-index of battery all reaches more than 400 times, illustrate that the battery that adopts method provided by the invention to prepare has good, stable cycle performance, and the battery capacity decay is slowly.
Claims (9)
1, a kind of preparation method of electrodes of lithium-ion batteries, this method comprise will contain the slurry of active material apply and/or be filled on the collector body, drying, calendering is characterized in that, the number of times of described calendering is for repeatedly.
2, method according to claim 1, wherein, after calendering for the first time, the variable quantity of pole piece thickness is the 10-50% of pole piece varied in thickness total amount, after at least once calendering of carrying out after calendering is finished for the first time, the variable quantity of pole piece thickness is the 50-90% of pole piece varied in thickness total amount.
3, method according to claim 2, wherein, after calendering for the first time, the variable quantity of pole piece thickness is the 10-40% of pole piece varied in thickness total amount, after at least once calendering of carrying out after calendering is finished for the first time, the variable quantity of pole piece thickness is the 60-90% of pole piece varied in thickness total amount.
4, according to claim 2 or 3 described methods, wherein, the calendering number of times that carries out after calendering for the first time is for once.
5, a kind of preparation method of lithium ion battery, this method comprises positive pole and the negative pole for preparing this battery, and with positive pole, negative pole and barrier film are prepared into pole piece, the pole piece and the electrolyte that obtain are sealed in the battery case, the preparation method of described positive pole and negative pole comprises and will contain positive active material, the slurry of conductive agent and anodal adhesive and solvent applies and/or is filled on the collector body, and the slurry that will contain negative electrode active material and negative pole adhesive and solvent applies and/or is filled on the collector body, dry, to the dried positive active material that contains, the collector body of conductive agent and anodal adhesive and contain negative electrode active material and the collector body of negative pole adhesive rolls, wherein, to the dried positive active material that contains, the collector body of conductive agent and anodal adhesive and contain negative electrode active material and the collector body of negative pole adhesive at least one the number of times of calendering for repeatedly.
6, method according to claim 5 wherein, contains the collector body of positive active material, conductive agent and anodal adhesive and contains negative electrode active material and the number of times of the calendering of the collector body of negative pole adhesive is repeatedly dried.
7, according to claim 5 or 6 described methods, wherein, after calendering for the first time, the variable quantity of pole piece thickness is the 10-50% of pole piece varied in thickness total amount, after at least once calendering of carrying out after calendering is finished for the first time, the variable quantity of pole piece thickness is the 50-90% of pole piece varied in thickness total amount.
8, method according to claim 7, wherein, after calendering for the first time, the variable quantity of pole piece thickness is the 10-40% of pole piece varied in thickness total amount, after at least once calendering of carrying out after calendering is finished for the first time, the variable quantity of pole piece thickness is the 60-90% of pole piece varied in thickness total amount.
9, method according to claim 7, wherein, the calendering number of times that carries out after calendering for the first time is for once.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101509413B1 (en) * | 2009-05-28 | 2015-04-07 | 닛산 지도우샤 가부시키가이샤 | Negative electrode for lithium ion secondary battery and battery using same |
| CN102315425A (en) * | 2011-06-13 | 2012-01-11 | 奇瑞汽车股份有限公司 | Method for manufacturing lithium battery negative electrode plate |
| CN102324496A (en) * | 2011-09-19 | 2012-01-18 | 江苏乐能电池股份有限公司 | Tabletting method for lithium ion battery positive plate |
| JP6067636B2 (en) | 2014-09-12 | 2017-01-25 | トヨタ自動車株式会社 | Method for producing electrode for lithium ion secondary battery |
| KR102100879B1 (en) * | 2015-10-30 | 2020-04-13 | 주식회사 엘지화학 | Positive electrode for secondary battery, preparation method thereof, and lithium secondary battery comprising the same |
| CN107403905B (en) * | 2016-05-18 | 2020-02-14 | 宁德新能源科技有限公司 | Lithium ion battery positive plate and preparation method thereof |
| CN111864178A (en) * | 2020-07-19 | 2020-10-30 | 江西安驰新能源科技有限公司 | Rolling method and rolling device for thick pole piece of lithium battery and lithium battery |
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| CN1083270A (en) * | 1993-05-31 | 1994-03-02 | 南开大学森力高技术实业公司 | The continuous production processes of hydrogen-storage alloy electrode plate |
| JPH09293500A (en) * | 1996-04-26 | 1997-11-11 | Sanyo Electric Co Ltd | Manufacture of electrode plate for use in storage battery |
| CN1532984A (en) * | 2003-03-21 | 2004-09-29 | 比亚迪股份有限公司 | Method for producing lithium ion secondary cell |
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2005
- 2005-10-24 CN CNB2005101143817A patent/CN100449824C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1083270A (en) * | 1993-05-31 | 1994-03-02 | 南开大学森力高技术实业公司 | The continuous production processes of hydrogen-storage alloy electrode plate |
| JPH09293500A (en) * | 1996-04-26 | 1997-11-11 | Sanyo Electric Co Ltd | Manufacture of electrode plate for use in storage battery |
| CN1532984A (en) * | 2003-03-21 | 2004-09-29 | 比亚迪股份有限公司 | Method for producing lithium ion secondary cell |
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Assignee: Shenzhen BYD Lithium Battery Co., Ltd. Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.4.25 to 2012.11.19 contract change Contract record no.: 2008440000071 Denomination of invention: Battery pole piece and manufacturing method of lithium ion secordary battery containing the pole piece License type: Exclusive license Record date: 2008.5.13 |
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Assignee: Shenzhen BYD Lithium Battery Co., Ltd. Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.11.12 to 2014.4.30 contract change Contract record no.: 2008440000368 Denomination of invention: Battery pole piece and manufacturing method of lithium ion secordary battery containing the pole piece Granted publication date: 20090107 License type: Exclusive license Record date: 20081113 |
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