CN102306827B - Safe lithium ion battery - Google Patents
Safe lithium ion battery Download PDFInfo
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- CN102306827B CN102306827B CN201110237410.4A CN201110237410A CN102306827B CN 102306827 B CN102306827 B CN 102306827B CN 201110237410 A CN201110237410 A CN 201110237410A CN 102306827 B CN102306827 B CN 102306827B
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- lithium ion
- pole
- lithium
- ion battery
- negative
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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 safe lithium ion battery which comprises an anode and a cathode, wherein the anode is made from lithium cobaltate, and the grain distribution value D50 of the lithium cobaltate is in the range of 10.5-13.5mu m; and the cathode is formed by mixing lithium grains with carbon grains, and the grain distribution value D50 of materials is in the range of 16.0-19.0 mu m. Due to the improvement, the lithium ion battery can perfectly avoid safety accidents in the case of predictable improper operation or a special operation, and is more safe to use.
Description
Technical field
The present invention relates to a kind of battery, particularly a kind of lithium ion battery.
Background technology
The security performance of lithium ion battery is the focal issue that battery is used field to pay close attention to most, has many potential safety hazards in the use procedure of lithium ion battery.Lithium ion battery, in abuse in the situation that, likely causes battery to occur smoldering, exploding, and even the situation such as injury to personnel.Therefore, the security performance of improvement lithium ion battery is very necessary.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of lithium ion battery with high safety performance.
In order to solve the problems of the technologies described above, a kind of safety lithium ion cell of the present invention, comprise positive pole and negative pole, described positive pole is made by cobalt acid lithium, its material particle size Distribution Value D50 is within the scope of 10.5 ~ 13.5 μ m, negative pole is mixed by lithium particle and carbon granule, and its material particle size Distribution Value D50 is within the scope of 16.0 ~ 19.0 μ m; Positive pole ear is 2/5 place of pole piece overall length apart from pole piece end, and negative lug is positioned at battery core outermost layer, makes battery core circular arc degree improve.
As the improvement of technique scheme, the capacity of described negative pole is 1.18 times of anodal capacity.
As the improvement of technique scheme, described positive and negative electrode surface is coated with utmost point film, and the deviate of the pole piece thickness of positive and negative electrode is ± 3 μ m.
The invention has the beneficial effects as follows: this lithium ion battery is owing to having taked above-mentioned improvement, predictable method of operation in the middle of or in operation in special circumstances, still can avoid well occurring security incident, use safer.
Embodiment
A kind of safety lithium ion cell of the present invention, comprise positive pole and negative pole, described positive pole is made by cobalt acid lithium, its material particle size Distribution Value D50 is within the scope of 10.5 ~ 13.5 μ m, in the electrochemical oxidation process occurring at inside battery, can there is thermal decomposition in positive electrode active materials material, send a large amount of heat, the sour lithium of cobalt that selected thermal stability and over-charging are good, as positive electrode active materials, is conducive to improve the security performance of battery; Negative pole is mixed by lithium particle and carbon granule, and its material particle size Distribution Value D50 is within the scope of 16.0 ~ 19.0 μ m, and in charge and discharge process, lithium embeds and deviates from carbon granule, can effectively reduce electrode impedance, reduces the formation of Li dendrite.
In the present embodiment, when considering the cycle characteristics of both positive and negative polarity and overcharging, negative pole is accepted the ability of lithium, and the capacity of described negative pole is 1.18 times of anodal capacity, avoids lithium metal to deposit in negative terminal surface, produces Li dendrite.Secondly, improvement both positive and negative polarity lug position, positive pole ear is 2/5 place of pole piece overall length apart from pole piece end, negative lug is positioned at battery core outermost layer, makes battery core circular arc degree greatly improve, and avoids pole piece to play that angle or lug pierce through barrier film and the safety problem that causes.
Described positive and negative electrode surface is coated with utmost point film, the deviate of the pole piece thickness of positive and negative electrode is ± 3 μ m, improve the uniformity of positive and negative electrode pole coating utmost point film, make to polarize everywhere in charging process big or small identical, avoid occurring that lithium metal is in the situation of negative terminal surface local deposits, make lithium ion in active material, successfully embed and to deviate from.
After improvement by above-mentioned measure, lithium ion battery safety performance is significantly improved, super-charge super-discharge, short circuit, acupuncture, fall with a plurality of extreme test conditions such as thermal shock under, there is not yet security incident, greatly improve battery safety, guarantee in use personnel's safety, expand the commercialized degree of lithium ion battery.
The foregoing is only preferential execution mode of the present invention, as long as within the technical scheme that realizes the object of the invention with basic identical means all belongs to protection scope of the present invention.
Claims (2)
1. a safety lithium ion cell, comprise positive pole and negative pole, it is characterized in that described positive pole made by cobalt acid lithium, its material particle size Distribution Value D50 is within the scope of 10.5 ~ 13.5 μ m, negative pole is mixed by lithium particle and carbon granule, and its material particle size Distribution Value D50 is within the scope of 16.0 ~ 19.0 μ m; Positive pole ear is 2/5 place of pole piece overall length apart from pole piece end, and negative lug is positioned at battery core outermost layer, makes battery core circular arc degree improve.
2. safety lithium ion cell according to claim 1, the capacity that it is characterized in that described negative pole is 1.18 times of anodal capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110237410.4A CN102306827B (en) | 2011-08-18 | 2011-08-18 | Safe lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110237410.4A CN102306827B (en) | 2011-08-18 | 2011-08-18 | Safe lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102306827A CN102306827A (en) | 2012-01-04 |
| CN102306827B true CN102306827B (en) | 2014-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110237410.4A Active CN102306827B (en) | 2011-08-18 | 2011-08-18 | Safe lithium ion battery |
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| Country | Link |
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| CN (1) | CN102306827B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5765404B2 (en) * | 2013-10-31 | 2015-08-19 | 株式会社豊田自動織機 | Lithium ion secondary battery |
| CN110212260A (en) * | 2018-02-28 | 2019-09-06 | 中信国安盟固利动力科技有限公司 | A kind of solid lithium ion battery and battery system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1427490A (en) * | 2001-12-19 | 2003-07-02 | Fmc公司 | Dispersion of lithium metal in anode of secondarycell |
| CN101685852A (en) * | 2008-09-25 | 2010-03-31 | 深圳市比克电池有限公司 | Method for preparing lithium ion battery anode material |
| CN101785137A (en) * | 2008-05-28 | 2010-07-21 | 松下电器产业株式会社 | Cylindrical nonaqueous electrolytic secondary battery |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07296796A (en) * | 1994-04-27 | 1995-11-10 | Mitsubishi Cable Ind Ltd | Negative electrode for lithium secondary battery, and lithium secondary battery |
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2011
- 2011-08-18 CN CN201110237410.4A patent/CN102306827B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1427490A (en) * | 2001-12-19 | 2003-07-02 | Fmc公司 | Dispersion of lithium metal in anode of secondarycell |
| CN101785137A (en) * | 2008-05-28 | 2010-07-21 | 松下电器产业株式会社 | Cylindrical nonaqueous electrolytic secondary battery |
| CN101685852A (en) * | 2008-09-25 | 2010-03-31 | 深圳市比克电池有限公司 | Method for preparing lithium ion battery anode material |
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| Publication number | Publication date |
|---|---|
| CN102306827A (en) | 2012-01-04 |
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