CN103280597B - Lithium ion battery - Google Patents
Lithium ion battery Download PDFInfo
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- CN103280597B CN103280597B CN201310213734.3A CN201310213734A CN103280597B CN 103280597 B CN103280597 B CN 103280597B CN 201310213734 A CN201310213734 A CN 201310213734A CN 103280597 B CN103280597 B CN 103280597B
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- lithium ion
- melting point
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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
The invention discloses a kind of lithium ion battery, it includes positive plate, negative plate and the barrier film being interval between positive/negative plate, positive plate includes plus plate current-collecting body and the positive pole diaphragm being coated on plus plate current-collecting body, negative plate includes negative current collector and the cathode membrane being coated on negative current collector, subregion on plus plate current-collecting body or negative current collector is coated with one layer of low melting point coating, position corresponding with low melting point coating is coated with one layer of Conductive Resistive Layer on another collector, barrier film with low melting point coating, the corresponding position of Conductive Resistive Layer offers perforate and low melting point coating and Conductive Resistive Layer is directly contacted.Compared with prior art, what the present invention realized battery using the method for physical short overcharges protection, both effectively ensure that safety of the battery under overcharging state, again will not the big influence of the chemical property generation to battery.
Description
Technical field
The invention belongs to field of lithium ion battery, it is more particularly related to which one kind, which has, well overcharges protectiveness
The lithium ion battery of energy.
Background technology
Lithium ion battery has had energy density height, operating voltage height, memory-less effect since the commercialization, due to it, followed
Ring long lifespan, it is environmentally safe many advantages, such as and be widely used as the power supplys of various mobile devices, so as to quickly enter
The large-scale practical stage.
With various mancarried electronic aids continuous multifunction and become more meticulous, its energy density to lithium ion battery
Higher and higher requirement is proposed, the raising of lithium ion battery energy density then proposes higher requirement to its safe design.
It can also be reached because battery can continue heat release, especially active material of cathode and electrolyte etc. during overcharge in battery
There is side reaction during high voltage and highly exothermic, thermal accumlation to a certain extent after, battery there is the risk of combustion explosion.Closely
Happening occasionally for several years battery of mobile phone exploding and firing accidents, illustrates that the security performance of existing battery also has great hidden danger.
In view of this, it is a kind of with the lithium ion battery for well overcharging protective value it is necessory to provide.
The content of the invention
It is an object of the invention to：A kind of lithium ion battery for having and well overcharging protective value is provided.
In order to realize foregoing invention purpose, the invention provides a kind of lithium ion battery, it include positive plate, negative plate and
The barrier film between positive/negative plate is interval in, positive plate includes plus plate current-collecting body and the cathode film being coated on plus plate current-collecting body
Piece, negative plate includes negative current collector and the cathode membrane being coated on negative current collector, plus plate current-collecting body or negative current collector
On subregion be coated with position corresponding with low melting point coating on one layer of low melting point coating, another collector and be coated with one
Layer Conductive Resistive Layer, barrier film offers perforate in the position corresponding with low melting point coating, Conductive Resistive Layer and makes low melting point
Coating and Conductive Resistive Layer are directly contacted.
After the lithium ion battery of the present invention is warming up to certain temperature because overcharging, its low melting point coating is to be melted, and is made
Positive/negative plate is in barrier film tapping formation short dot, so as to play a part of shunting；Meanwhile, the Conductive Resistive Layer of coating can be with
Reduce the electric current that internal short-circuit is produced, reduce heat release.It is interior during short circuit due to that can be controlled by controlling the resistance of Conductive Resistive Layer
The size of electric current, therefore final charging current can pass through from internal short-circuit point, so as to avoid cells burst from exploding, it is ensured that battery
Security under overcharging state.
As lithium ion battery of the present invention one kind improve, the fusing point of the low melting point coating between 60 DEG C to 200 DEG C,
Its reason is：If the fusing point of low melting point coating is too high, just it can not melt to cause internal short-circuit before cells burst, so as to rise
Less than the protective effect to battery；If the fusing point of low melting point coating is too low, battery short-circuit failure at high temperature can be caused again.
As lithium ion battery of the present invention one kind improve, the thickness of the low melting point coating between 5 μm to 200 μm,
Its reason is：If the thickness of low melting point coating is too small, short-circuit risks are also had under the normal use of battery；If low melting point coating
Thickness is too big, then can influence possibility short-circuit under the energy density and high temperature of battery.
Improved as one kind of lithium ion battery of the present invention, the low melting point coating is the coating insoluble in electrolyte, its
Swellbility in the electrolytic solution is less than 100%, and its reason is：If low melting point coating is dissolved in electrolyte, battery is processed
Can occur short circuit in journey and fail；If the swellbility of low melting point coating is too big, battery has short-circuit risks.
As lithium ion battery of the present invention one kind improve, the low melting point coating be paraffin, microwax, Tissuemat E,
One kind or its combination in polypropylene.
Improved as one kind of lithium ion battery of the present invention, the resistivity of the Conductive Resistive Layer is in 0.5 Ω/m to 200
Between Ω/m, its reason is：If the resistivity of Conductive Resistive Layer is too low, produced after over-charging of battery high temperature internal short-circuit can be caused
Electric current is too big, and its excessive heat release may also can cause cells burst；If the resistivity of Conductive Resistive Layer is too high, do not have point
The effect of stream and effective protection can not be formed to battery.
Improved as one kind of lithium ion battery of the present invention, the thickness of the Conductive Resistive Layer is between 5 μm to 200 μm.
Improved as one kind of lithium ion battery of the present invention, the perforate size of the barrier film accounts for flat where perforate in core
5%~100% of cross-sectional area at face, this is in order to avoid barrier film perforate is too small and reduces the possibility of high temperature short circuit
Property.
Improved as one kind of lithium ion battery of the present invention, the Conductive Resistive Layer is by containing butylbenzene binding agent, carboxylic first
The slurry of base sodium cellulosate and conductive black is coated with to be formed.
Improved as one kind of lithium ion battery of the present invention, the lithium ion battery is winding type lithium ion battery, eutectic
Point coating and Conductive Resistive Layer are coated on the winding initiating terminal of positive/negative plate or terminate end.
Compared with prior art, what the present invention realized battery using the method for physical short overcharges protection, both effective guarantor
Safety of the battery under overcharging state has been demonstrate,proved, big influence will not have been produced to the chemical property of battery again.
Brief description of the drawings
Below in conjunction with the drawings and specific embodiments, lithium ion battery of the present invention and its advantage are carried out specifically
It is bright, wherein：
Fig. 1 is the structural representation of lithium ion battery first embodiment of the present invention.
Fig. 2 is the structural representation of lithium ion battery second embodiment of the present invention.
Fig. 3 is the barrier film perforate schematic diagram of lithium ion battery of the present invention.
Fig. 4 is that voltage x current temperature of the lithium ion battery made from comparative example 1 during 1C6V is overcharged is changed over time
Curve map.
Fig. 5 is that voltage x current temperature of the lithium ion battery made from comparative example 2 during 1C6V is overcharged is changed over time
Curve map.
Fig. 6 is that voltage x current temperature of the lithium ion battery made from embodiment 1 during 1C6V is overcharged is changed over time
Curve map.
Embodiment
In order that goal of the invention, technical scheme and the advantageous effects of the present invention become apparent from, below in conjunction with accompanying drawing and
Embodiment, the present invention will be described in further detail.It should be appreciated that the embodiment described in this specification is only to be
The present invention is explained, is not intended to limit the present invention.
Fig. 1 is referred to Fig. 3, lithium ion battery of the present invention includes positive plate 10, negative plate 20 and barrier film 30.Positive plate
10 include plus plate current-collecting body 12 and the positive pole diaphragm 14 being coated on plus plate current-collecting body 12, and negative plate 20 includes negative current collector 22
With the cathode membrane 24 being coated on negative current collector 22.Barrier film 30 is interval between positive plate 10 and negative plate 20.
Wherein, the subregion on plus plate current-collecting body 12 be coated with one layer of low melting point coating 40, negative current collector 22 with
The corresponding position of low melting point coating 40 is coated with one layer of Conductive Resistive Layer 50, barrier film 30 then with low melting point coating 40, conductive
The correspondence position of resistive layer 50 opens up perforate 32, and the presence of perforate 32 makes low melting point coating 40 and Conductive Resistive Layer 50 directly connect
Touch.The size of perforate 32 be the spreading area of low melting point coating 40 50% or so, and with the centre position phase of low melting point coating 40
Correspondence.
In various embodiments, low melting point coating 40 and Conductive Resistive Layer 50 can be respectively coated as shown in Figure 1
The winding initiating terminal of positive plate 10 and negative plate 20, can also be respectively coated in positive plate 10 and negative plate 20 as shown in Figure 2
Winding terminates end.
In addition, the pole piece that low melting point coating 40 and Conductive Resistive Layer 50 are coated with can be exchanged, that is to say, that can also be by
Low melting point coating 40 is coated on negative current collector 22, while Conductive Resistive Layer 50 to be coated on to the corresponding position of plus plate current-collecting body 12
Put.
After the lithium ion battery of the present invention is warming up to certain temperature because overcharging, its low melting point coating 40 is melted,
Positive/negative plate forms short dot at the perforate 32 of barrier film 30, so as to play a part of shunting；Meanwhile, the conductive resistance of coating
Layer 50 can reduce the electric current of internal short-circuit generation, reduce heat release.Due to can be by controlling the resistance of Conductive Resistive Layer 50 to control
The size of interior electric current during system short circuit, therefore final charging current can pass through from internal short-circuit point, so as to avoid cells burst quick-fried
It is fried, it is ensured that security of the battery under overcharging state.
Embodiment 1
The preparation of negative plate：Cathode size formula is based on siccative percentage by weight, by 2% butylbenzene binding agent, 2% carboxymethyl
Totally four parts are constituted for sodium cellulosate, 1.5% conductive black, 94.5% negative electrode active material, and wherein negative electrode active material uses people
Make graphite.First, water and sodium carboxymethylcellulose are added in mixer grinder by formula more than, are dissolved under vacuum conditions
Completely, aqueous high molecular solution is obtained；Conductive black is added in the aqueous high molecular solution dissolved by formula again, soon
Fast agitation grinding to fineness is less than 5 μm；Delanium is added by formula again, vacuum is mixed slowly uniformly；It is eventually adding butylbenzene
Binding agent, vacuum is mixed slowly uniformly；Filtered with 150 mesh stainless steel mesh and required cathode size is made.By cathode size
Equably it is coated in thickness and is 8 μm of copper foil two sides, then be compacted pole piece with roll squeezer, last cut-parts, soldering polar ear obtains water
Property negative plate.
The preparation of positive plate：Anode sizing agent is based on siccative percentage by weight, and its solid constituent includes 90% positive-active
Material, 5% PVDF (Kynoar) bonding agents and 5% conductive black, wherein, positive active material uses cobalt acid lithium
(LiCoO2)；It uses 1-METHYLPYRROLIDONE (NMP) as solvent, and the solids content of slurry is 40%.First, match somebody with somebody more than
1-METHYLPYRROLIDONE (NMP) and PVDF are added in mixer grinder by side, are dissolved complete under vacuum conditions, are obtained PVDF
Solution；Conductive black is added in the oiliness PVDF solution dissolved by formula again, quick agitation grinding to fineness is 5
Below μm；Cobalt acid lithium finally is added by formula, is stirred under vacuum uniform；With 200 mesh stainless steel mesh filtering i.e. be made it is required just
Pole slurry.Anode sizing agent is equably coated in thickness and is 12 μm of aluminium foil two sides, then is compacted pole piece with roll squeezer, is finally cut out
Piece, soldering polar ear, that is, obtain oiliness positive plate.
The preparation of electrolyte：By ethylene carbonate EC, propene carbonate PC and dimethyl carbonate DMC according to volume ratio 3：3：
4 are configured to mixed solvent, then add solute lithium hexafluoro phosphate (LiPF6), and make LiPF6Concentration be 1M, after stirring
Obtain electrolyte.
The preparation of low melting point coating：Fusing point is melted for 130 DEG C of microwax at 150 DEG C, multiplies hot rapid in positive pole collection
Position coating thickness on fluid inside correspondence core is 30 μm of coating.
The preparation of barrier film：From polypropylene (PP) perforated membrane that thickness is 14 μm as barrier film, and in correspondence eutectic
The position perforate of point coating, the size of perforate is the half of low melting point coating spreading area, and position is in low melting point coating correspondence position
The center put.
The preparation of Conductive Resistive Layer：The coating sizing-agent of Conductive Resistive Layer is by 45% butylbenzene binding agent, 45% carboxymethyl cellulose
Plain sodium, the part of 10% conductive black three composition.First, water and sodium carboxymethylcellulose are added to agitation grinding by formula more than
In machine, dissolve complete under vacuum conditions, obtain aqueous high molecular solution；Conductive black is added by formula again and dissolved
Aqueous high molecular solution in, quick agitation grinding to fineness be less than 1 μm；Finally butylbenzene binding agent, vacuum are added by formula
Mix slowly uniform；Filtered with 150 mesh stainless steel mesh, that is, required Conductive Resistive Layer coating sizing-agent is made.Slurry is coated with
On negative current collector, position is corresponding with the position of the upper low melting point coating of plus plate current-collecting body.
The preparation of lithium ion battery：Obtained positive plate, barrier film and negative plate are wound to form battery core, then use aluminum plastic film
Encapsulation, and inject electrolyte；Battery is melted into and burn-in test after encapsulation, obtain length and width, it is thick be respectively 32mm, 82mm,
4.2mm square flexible package lithium ion.
Embodiment 2
It is with the difference of embodiment 1：Conductive Resistive Layer coating sizing-agent is by 40% butylbenzene binding agent, 40% carboxymethyl
Sodium cellulosate and the part of 20% conductive black three composition.Remaining material and step etc. are same as Example 1, no longer go to live in the household of one's in-laws on getting married herein
State.
Embodiment 3
It is with the difference of embodiment 1：Conductive Resistive Layer coating sizing-agent is by 47.5% butylbenzene binding agent, 47.5% carboxylic
Sodium carboxymethylcellulose pyce and the part of 5% conductive black three composition.Remaining material and step etc. are same as Example 1, herein no longer
Repeat.
Embodiment 4
It is with the difference of embodiment 1：Positive plate uses 70% cobalt acid lithium (LiCoO2) and 30% ternary material
Expect (LiNi0.5Co0.2Mn0.3) mixing is as positive active material, proportion is still in anode sizing agent solid constituent for two kinds of materials
For 90%.Remaining material and step etc. are same as Example 1, and here is omitted.
Embodiment 5
Difference from Example 1 is：The preparation process of low melting point coating is, by the Tissuemat E that fusing point is 110 DEG C
Melted at 150 DEG C, multiply the coating that the hot rapid position coating thickness on plus plate current-collecting body inside correspondence core is 30 μm.Its
Remaining material and step etc. are same as Example 1, and here is omitted.
Embodiment 6
Difference from Example 1 is：
The preparation of low melting point coating：Fusing point is melted for 130 DEG C of polypropylene at 150 DEG C, multiplies hot rapid in negative pole collection
Position coating thickness on fluid inside correspondence core is 30 μm of coating；
The preparation of barrier film：From polypropylene (PP) perforated membrane that thickness is 14 μm as barrier film, and in correspondence eutectic
The position perforate of point coating, the size in hole is the half of low melting point coating spreading area, and position is in low melting point coating correspondence position
Center；
The preparation of Conductive Resistive Layer：The coating sizing-agent of Conductive Resistive Layer is by 45% butylbenzene binding agent, 45% carboxymethyl cellulose
Plain sodium, the part of 10% conductive black three composition.First, water and sodium carboxymethylcellulose are added to agitation grinding by formula more than
In machine, dissolve complete under vacuum conditions, obtain aqueous high molecular solution；Conductive black is added by formula again and dissolved
Aqueous high molecular solution in, quick agitation grinding to fineness be less than 1 μm；Finally butylbenzene binding agent, vacuum are added by formula
Mix slowly uniform；Filtered with 150 mesh stainless steel mesh, that is, required Conductive Resistive Layer coating sizing-agent is made.Slurry is coated with
On plus plate current-collecting body, position is corresponding with the position of low melting point coating on negative current collector.
Remaining material and step etc. are same as Example 1, and here is omitted.
Comparative example 1
It is with the difference of embodiment 1：Not perforate on low melting point coating, barrier film is not coated with plus plate current-collecting body,
Conductive Resistive Layer is not coated with negative current collector.Remaining material and step etc. are same as Example 1, and here is omitted.
Comparative example 2
It is with the difference of embodiment 1：Conductive Resistive Layer is not coated with negative current collector.Remaining material and step etc.
Same as Example 1, here is omitted.
Overcharge test
At room temperature, constant-current charge is carried out to the battery of comparative example 1, comparative example 2 and embodiment 1 with 1C multiplying powers, is charged to 6V
Constant-voltage charge, respectively obtains and overcharges curve shown in Fig. 4, Fig. 5 and Fig. 6 afterwards.As shown in Figure 4, the normal battery of comparative example 1 is being held
Temperature is gradually increasing during continuous high-voltage charge, when temperature reaches 110 DEG C or so, and temperature rises rapidly and finally burnt.
As shown in Figure 5, comparative example 2 is coated with the battery of low melting point coating when temperature reaches 90 DEG C or so, internal short-circuit of battery, charging
Voltage is reduced rapidly；But after short circuit, due to interior resistance very little, very imperial palace electric current is produced and highly exothermic, so as to accelerate battery
Burning.It will be appreciated from fig. 6 that the battery of embodiment 1, when constant-voltage phase temperature reaches 100 DEG C or so, internal short-circuit of battery, temperature
Begin to decline, finally make cell safety by overcharging test.It can be seen that, lithium ion battery of the present invention can be protected under overcharging state
Card safety.
In summary, the present invention is coated with one layer of low melting point by the subregion on negative current collector or plus plate current-collecting body
Coating, one layer of Conductive Resistive Layer is coated with the correspondence position of another collector, and opens up perforate in the correspondence position of barrier film,
So that battery is after overcharging state is issued to certain temperature, low melting point cladding melts and in barrier film tapping formation both positive and negative polarity
Short dot, so as to reach the effect of shunting, reduces the electric current by pole piece；Meanwhile, in the Conductive Resistive Layer of coating can reduce
The electric current that short circuit is produced, reduces heat release, is finally reached the function of overcharging protection, it is to avoid battery catches fire explodes, and increases battery
Security.
Compared with prior art, lithium ion battery of the present invention at least has advantages below：
First, protective value is overcharged with good, can ensure that battery is pacified under the high-tension overcharging state of high current
Entirely, and cell safety can be ensured under lasting overcharging state；
Second, by the guard method that overcharges used is physical method, therefore the chemical property of battery will not be produced
Raw big influence, ensure that the performance of battery.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned embodiment party
Formula carries out appropriate change and modification.Therefore, the invention is not limited in embodiment disclosed and described above, to this
Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.Although in addition, this specification
In used some specific terms, but these terms are merely for convenience of description, do not constitute any limitation to the present invention.
Claims (9)
1. a kind of lithium ion battery, including positive plate, negative plate and the barrier film that is interval between positive/negative plate, positive plate includes
Plus plate current-collecting body and the positive pole diaphragm being coated on plus plate current-collecting body, negative plate include negative current collector and are coated on negative pole currect collecting
Cathode membrane on body, it is characterised in that：Subregion on the plus plate current-collecting body or negative current collector is coated with one layer low
Position corresponding with low melting point coating is coated with one layer of Conductive Resistive Layer on fusing point coating, another collector, barrier film with
The corresponding position of low melting point coating, Conductive Resistive Layer offers perforate and low melting point coating and Conductive Resistive Layer is directly connect
Touch；The Conductive Resistive Layer is coated with to be formed by the slurry containing butylbenzene binding agent, sodium carboxymethylcellulose and conductive black.
2. lithium ion battery according to claim 1, it is characterised in that：The fusing point of the low melting point coating is arrived at 60 DEG C
Between 200 DEG C.
3. lithium ion battery according to claim 1, it is characterised in that：The thickness of the low melting point coating is at 5 μm to 200
Between μm.
4. lithium ion battery according to claim 1, it is characterised in that：The low melting point coating is insoluble in electrolyte
Coating, its swellbility in the electrolytic solution is less than 100%.
5. lithium ion battery according to claim 1, it is characterised in that：The low melting point coating is paraffin, microwax, gathered
One kind or its combination in ethylene waxes, polypropylene.
6. lithium ion battery according to claim 1, it is characterised in that：The resistivity of the Conductive Resistive Layer 0.5 Ω/
Between m to 200 Ω/m.
7. lithium ion battery according to claim 1, it is characterised in that：The thickness of the Conductive Resistive Layer is at 5 μm to 200
Between μm.
8. lithium ion battery according to claim 1, it is characterised in that：The perforate size of the barrier film, which is accounted in core, to be opened
5%~100% of cross-sectional area at plane where hole.
9. lithium ion battery according to any one of claim 1 to 8, it is characterised in that：The lithium ion battery is volume
Geometric pattern lithium ion battery, low melting point coating and Conductive Resistive Layer are coated on the winding initiating terminal of positive/negative plate or terminate end.
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| CN201310213734.3A CN103280597B (en) | 2013-05-31 | 2013-05-31 | Lithium ion battery |
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| CN201310213734.3A CN103280597B (en) | 2013-05-31 | 2013-05-31 | Lithium ion battery |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105449263B (en) * | 2014-08-22 | 2018-05-22 | 宁德时代新能源科技股份有限公司 | Lithium ion secondary battery |
| CN105974319A (en) * | 2016-04-21 | 2016-09-28 | 中国民航大学 | 18650 lithium battery thermal runaway chain reaction test method |
| CN107645001A (en) * | 2017-08-21 | 2018-01-30 | 上海空间电源研究所 | A kind of experimental rig and test method for simulating lithium battery internal short-circuit |
| CN110265665B (en) * | 2019-05-24 | 2020-11-17 | 宁德时代新能源科技股份有限公司 | Positive current collector, positive pole piece and electrochemical device |
| CN110824372A (en) * | 2019-11-25 | 2020-02-21 | Oppo广东移动通信有限公司 | Method and equipment for judging short circuit in battery and electronic equipment |
| CN113826277B (en) * | 2020-03-27 | 2023-09-01 | 宁德新能源科技有限公司 | Electrochemical device and electronic device comprising same |
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| CN1732587A (en) * | 2002-12-27 | 2006-02-08 | 松下电器产业株式会社 | Electrochemical device and method for manufacturing same |
| CN101894937A (en) * | 2010-07-02 | 2010-11-24 | 东莞新能源科技有限公司 | Lithium ion battery and positive plate thereof |
| CN102187504A (en) * | 2008-10-20 | 2011-09-14 | 日产自动车株式会社 | Bipolar secondary battery, battery pack, and vehicle equipped with the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012057752A1 (en) * | 2010-10-27 | 2012-05-03 | Alliance For Sustainable Energy, Llc | Passive safety device and internal short tested method for energy storage cells and systems |
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|---|---|---|---|---|
| CN1732587A (en) * | 2002-12-27 | 2006-02-08 | 松下电器产业株式会社 | Electrochemical device and method for manufacturing same |
| CN102187504A (en) * | 2008-10-20 | 2011-09-14 | 日产自动车株式会社 | Bipolar secondary battery, battery pack, and vehicle equipped with the same |
| CN101894937A (en) * | 2010-07-02 | 2010-11-24 | 东莞新能源科技有限公司 | Lithium ion battery and positive plate thereof |
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