CN101286574A - Lithium ion cell in cylinder shape - Google Patents
Lithium ion cell in cylinder shape Download PDFInfo
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- CN101286574A CN101286574A CNA2008100616677A CN200810061667A CN101286574A CN 101286574 A CN101286574 A CN 101286574A CN A2008100616677 A CNA2008100616677 A CN A2008100616677A CN 200810061667 A CN200810061667 A CN 200810061667A CN 101286574 A CN101286574 A CN 101286574A
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- lithium ion
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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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Abstract
The invention relates to a cylindrical lithium ion battery, comprising an electrical core, a cylindrical shell, electrolyte, and electrical connectors. The electrical core is provided with a cathode and an anode, wherein, the cathode comprises the copper foil of a current collector and two surfaces which are coated on the copper foil of the current collector and consist of negative active materials, binder and conductive carbon powder; the anode comprises the aluminum foil of a current collector and two surfaces which are coated on the aluminum foil of the current collector and consist of positive active materials, binder and conductive carbon powder. The cathode, a separator film, and the anode are overlaid in order and coiled to form the electrical core of the cylindrical lithium ion battery. The ratio Z between the per unit area capacity of the materials coated on the cathode and the per unit area capacity of the materials coated on the anode is between 1.00 and 1.10. According to the structural features of the cylindrical lithium ion battery and by adjusting and controlling the per unit area capacity of the coated materials on both surfaces of the cathode and the anode, the cylindrical lithium ion battery can improve the designed capacity of the battery and ensure the charging and discharging safety of the lithium ion battery on the basis of saving the coated materials of the lithium ion battery.
Description
Technical field
The present invention relates to a kind of lithium ion battery, be specifically related to a kind of column lithium ion battery.
Background technology
Disclosed data shows that lithium ion battery is that coating comprises that cathode size and dry back that negative electrode active material, binding agent, conductive carbon powder and water are formed form negative pole on copper foil of affluxion body; Be coated with anode sizing agent that positive active material, binding agent, conductive carbon powder and NMP form and dry back and form anodally on the collector aluminium foil, negative pole, barrier film, positive pole are stacked successively and reel and form column lithium ion battery.Along with the continuous development of electronic technology, and function is also in continuous increase, and this has just proposed more and more higher requirement to energy, volume and the environmental requirement of lithium ion battery.Column lithium ion battery is widely used in all kinds of portable electric appts as a kind of battery with high energy density and favorable environment protection energy.
Usually the capacity per unit area of the negative pole coating substance of lithium ion battery must be greater than the capacity per unit area of anodal coating substance, and the ratio of existing design all is greater than 1.10, otherwise meeting produces Li dendrite and causes potential safety hazard in charging process.But the ratio of the capacity per unit area of negative/positive coating substance again can not be too big, otherwise can cause waste.In column lithium ion battery, all adopt the design of traditional square lithium ion battery at present, its negative/positive coating substance capacity per unit area ratio is constant, more than 1.10.But because the special construction characteristics of column lithium ion battery, its negative/anodal coating substance capacity per unit area changes according to bending radius, and therefore constant its negative/positive coating substance capacity per unit area ratio can cause different radii place capacity not match and produce safety problem or the valuable resource of waste.
Summary of the invention
For overcoming the above-mentioned shortcoming of prior art, the invention provides a kind of column lithium ion battery, its negative/anodal coating substance capacity per unit area ratio is between 1.00-1.10, i.e. and the active material resource of saves valuable can guarantee the capacity and the safety of battery again.
The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of column lithium ion battery, comprise electric core, cylinder blanket, electrolyte and electrical connector, described electric core comprises negative pole and positive pole, and described negative pole is by copper foil of affluxion body and be coated with on it be made up of negative electrode active material, binding agent and conductive carbon powder 121 and 122; Described positive pole is by the collector aluminium foil and be coated with on it be made up of positive active material, binding agent and conductive carbon powder 221 and 222; Negative pole, barrier film, anodal stacked successively and reel and form the electric core of column lithium ion battery is characterized in that: the ratio Z=1.00-1.10 of the capacity per unit area of the negative pole coating substance on the described negative pole and the capacity per unit area of the anodal coating substance on the positive pole.
Capacity per unit area on fixing described 121 and 122 of forming by negative electrode active material, binding agent and conductive carbon powder, according to described electric core winding radius r 221 and 222 the capacity per unit area of being made up of positive active material, binding agent and conductive carbon powder is set, the ratio Z=1.00-1.10 of the capacity per unit area of forming by positive active material, binding agent and conductive carbon powder on capacity per unit area of forming by negative electrode active material, binding agent and conductive carbon powder on the negative pole and the positive pole.
Capacity per unit area on fixing described 221 and 222 of forming by positive active material, binding agent and conductive carbon powder, according to described electric core winding radius r 121 and 122 the capacity per unit area of being made up of negative electrode active material, binding agent and conductive carbon powder is set, the ratio Z=1.00-1.10 of the capacity per unit area of forming by positive active material, binding agent and conductive carbon powder on capacity per unit area of forming by negative electrode active material, binding agent and conductive carbon powder on the negative pole and the positive pole.
121 of negative pole be arranged on 122 ratios of going up the weight of forming by negative electrode active material, binding agent and conductive carbon powder of coating ± 10% in.
Anodal 221 be arranged on 222 ratios of going up the weight of forming by positive active material, binding agent and conductive carbon powder of coating ± 10% in.
Compared with prior art, the invention has the advantages that: taking into full account of the influence of column lithium ion battery radius of curvature negative/positive electrode capacity balance, by adjustment to negative/anodal two sided coatings substance weight, make the column lithium ion battery negative pole realize the allocation optimum of coating substance and capacity with the anodal excessive equilibrium of the capacity over against the zone, thereby the safety problem of avoiding battery not match and cause at charge and discharge process growth Li dendrite because of the both positive and negative polarity capacity, can also in fixing volume, design the more battery of high power capacity by design of the present invention, all other performances and prior art are suitable, the inventive method is simple, is convenient to produce in batches.
Description of drawings
The core strueture schematic diagram that Fig. 1 reels for lithium ion battery positive and negative electrode of the present invention;
Fig. 2 is the structural representation of lithium ion battery negative of the present invention;
Fig. 3 is the structural representation of lithium ion cell positive of the present invention;
Fig. 4 is that lithium ion battery of the present invention is in the Z value at different radii r place and not according to Z value curve chart of the present invention.
Specific embodiments
Below in conjunction with accompanying drawing the embodiment of the invention is described in further detail.
As Fig. 2, shown in Figure 3, coating is made up of negative electrode active material, binding agent and conductive carbon powder on copper foil of affluxion body 11 121 and 122 and forms negative pole 1 are coated with 221 of being made up of positive active material, binding agent and conductive carbon powder and 222 and form positive pole 2 on collector aluminium foil 21.The ratio Z=1.00-1.10 of 221 and 222 capacity per unit area on the negative pole 1 on 121 and 122 the capacity per unit area and anodal 2.Fix the capacity per unit area on 121 and 122 that form by negative electrode active material, binding agent and conductive carbon powder, according to described electric core winding radius r 221 and 222 the capacity per unit area of being made up of positive active material, binding agent and conductive carbon powder, its ratio Z=1.00-1.10 are set.Or the capacity per unit area on fixing described 221 and 222 of forming by positive active material, binding agent and conductive carbon powder, according to described electric core winding radius r 121 and 122 the capacity per unit area of being made up of negative electrode active material, binding agent and conductive carbon powder, its ratio Z=1.00-1.10 are set.The ratio of the weight of the coating substance in the control 121 and 122 of negative pole is arranged on ± 10% in.The ratio of the weight of the coating substance on anodal 221 and 222 of control is arranged on ± 10% in.
Negative electrode active material in the negative pole is graphite-like or silicon class or silicon carbon alloy class etc.; Positive active material in the positive pole is cobalt acid lithium or LiMn2O4 or nickle cobalt lithium manganate or LiFePO4 etc.The mixing match of the negative electrode active material in the negative pole, binding agent, conductive carbon powder and water and the mixing match of the positive active material in the positive pole, binding agent, conductive carbon powder and NMP are routine techniques.
As shown in Figure 1, negative pole 1, barrier film 3, anodal 2 stacked successively and reel and form the electric core of column lithium ion battery.
Column lithium ion battery is made up of electric core, cylinder blanket, electrolyte and electrical connector.
With the coating and form 121 and 122 on Copper Foil 11 and aluminium foil 21 respectively of the negative pole for preparing and anode sizing agent, and 221 and 222.Coiling forms the electric core of the column lithium ion battery of radius r=2mm.Coating substance capacity per unit area on fixing anodal 221 is 0.0320mAh/mm
2, the Z value that pairing negative pole is 122 gets 1.09, and the negative material capacity per unit area that is coated with is 0.0349mAh/mm
2Coating substance capacity per unit area on fixing anodal 222 is 0.0320mAh/mm
2, the Z value that pairing negative pole is 121 gets 1.01, and the negative material capacity per unit area that is coated with is 0.0323mAh/mm
2Then by roll-in, cut, itemize, pairing, coiling, fluid injection, seal, change into, finish after the partial volume operation manufacture process of lithium ion battery.
Column lithium ion battery is made up of electric core, cylinder blanket, electrolyte and electrical connector.
With the coating and form 121 and 122 on Copper Foil 11 and aluminium foil 21 respectively of the negative pole for preparing and anode sizing agent, and 221 and 222, the electric core of the column lithium ion battery of coiling formation radius r=8mm.Fixedly the coating substance capacity per unit area on 121 at the negative pole is 0.0370mAh/mm
2, pairing anodal 222 Z value gets 1.10, and the positive electrode material capacity per unit area that is coated with is 0.0336mAh/mm
2Fixedly the coating substance capacity per unit area on 122 at the negative pole is 0.0370mAh/mm
2, pairing anodal 221 Z value gets 1.05, and the negative material capacity per unit area that is coated with is 0.0352mAh/mm
2Roll-in then, cut, itemize, pairing, coiling, fluid injection, seal, change into, finish after the partial volume operation manufacture process of lithium ion battery.
Fig. 4 to lithium ion battery of the present invention the Z value at different radii r place with do not compare according to Z value curve of the present invention:
Curve A be not designed according to this invention 121 with 222 Z value.
Curve B be designed according to this invention 122 with 221 Z value.
Curve C be designed according to this invention 121 with 222 Z value.
Curve B and C meet both capacity per unit area ratio Z=1.00-1.10.
The present invention is by the adjustment of control to negative/anodal two sided coatings material capacity per unit area, on the basis of the coating substance of saving lithium ion battery, can guarantee the fail safe of lithium ion battery, and can in fixing volume, promote battery capacity by increasing pole piece length, all other performances and prior art are suitable.
Claims (5)
1, a kind of column lithium ion battery, comprise electric core, cylinder blanket, electrolyte and electrical connector, described electric core comprises negative pole (1) and anodal (2), and described negative pole (1) is by copper foil of affluxion body (11) and be coated with (121) face and (122) face of being made up of negative electrode active material, binding agent and conductive carbon powder on it; Described positive pole (2) is by collector aluminium foil (21) and be coated with (221) face of being made up of positive active material, binding agent and conductive carbon powder and (222) face on it; Negative pole (1), barrier film (3), anodal (2) are stacked successively and reel and form the electric core of column lithium ion battery, it is characterized in that: the ratio Z=1.00-1.10 of the capacity per unit area of the anodal coating substance on the capacity per unit area of the negative pole coating substance on the described negative pole (1) and anodal (2).
2, a kind of column lithium ion battery according to claim 1, it is characterized in that: fixing described by negative electrode active material, (121) face that binding agent and conductive carbon powder are formed and the capacity per unit area on (122) face, be provided with by positive active material according to described electric core winding radius r, (221) face that binding agent and conductive carbon powder are formed and the capacity per unit area of (222) face, on the negative pole (1) by negative electrode active material, on the capacity per unit area that binding agent and conductive carbon powder are formed and anodal (2) by positive active material, the ratio Z=1.00-1.10 of the capacity per unit area that binding agent and conductive carbon powder are formed.
3, a kind of column lithium ion battery according to claim 1, it is characterized in that: fixing described by positive active material, (221) face that binding agent and conductive carbon powder are formed and the capacity per unit area on (222) face, be provided with by negative electrode active material according to described electric core winding radius r, (121) face that binding agent and conductive carbon powder are formed and the capacity per unit area of (122) face, on the negative pole (1) by negative electrode active material, on the capacity per unit area that binding agent and conductive carbon powder are formed and anodal (2) by positive active material, the ratio Z=1.00-1.10 of the capacity per unit area that binding agent and conductive carbon powder are formed.
4, a kind of column lithium ion battery according to claim 1 is characterized in that: the ratio of the weight of being made up of negative electrode active material, binding agent and conductive carbon powder that is coated with on (121) face of negative pole (1) and (122) face is arranged on ± 10% in.
5, a kind of column lithium ion battery according to claim 1 is characterized in that: the ratio of the weight of being made up of positive active material, binding agent and conductive carbon powder that is coated with on (221) face of anodal (2) and (222) face is arranged on ± 10% in.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100616677A CN101286574A (en) | 2008-05-21 | 2008-05-21 | Lithium ion cell in cylinder shape |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100616677A CN101286574A (en) | 2008-05-21 | 2008-05-21 | Lithium ion cell in cylinder shape |
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| CN101286574A true CN101286574A (en) | 2008-10-15 |
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| CNA2008100616677A Pending CN101286574A (en) | 2008-05-21 | 2008-05-21 | Lithium ion cell in cylinder shape |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101894940A (en) * | 2010-08-03 | 2010-11-24 | 哈尔滨工业大学 | Porous silicon-based cathode for lithium battery and preparation method thereof |
| CN103746139A (en) * | 2013-12-10 | 2014-04-23 | 宁波维科电池股份有限公司 | Lithium ion power battery with good safety performances |
| CN113544876A (en) * | 2020-03-31 | 2021-10-22 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN115000346A (en) * | 2022-08-08 | 2022-09-02 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery and power consumption device |
-
2008
- 2008-05-21 CN CNA2008100616677A patent/CN101286574A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101894940A (en) * | 2010-08-03 | 2010-11-24 | 哈尔滨工业大学 | Porous silicon-based cathode for lithium battery and preparation method thereof |
| CN101894940B (en) * | 2010-08-03 | 2012-12-19 | 哈尔滨工业大学 | Preparation method of porous silicon-based cathode for lithium battery |
| CN103746139A (en) * | 2013-12-10 | 2014-04-23 | 宁波维科电池股份有限公司 | Lithium ion power battery with good safety performances |
| CN113544876A (en) * | 2020-03-31 | 2021-10-22 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| CN115000346A (en) * | 2022-08-08 | 2022-09-02 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery and power consumption device |
| CN115000346B (en) * | 2022-08-08 | 2022-12-06 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery and power consumption device |
| WO2024031859A1 (en) * | 2022-08-08 | 2024-02-15 | 江苏时代新能源科技有限公司 | Electrode assembly, battery cell, battery and electric device |
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Open date: 20081015 |