CN103456979B - Ferric phosphate lithium cell - Google Patents
Ferric phosphate lithium cell Download PDFInfo
- Publication number
- CN103456979B CN103456979B CN201210181044.XA CN201210181044A CN103456979B CN 103456979 B CN103456979 B CN 103456979B CN 201210181044 A CN201210181044 A CN 201210181044A CN 103456979 B CN103456979 B CN 103456979B
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- Prior art keywords
- battery core
- lithium cell
- ferric phosphate
- phosphate lithium
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 38
- 239000005955 Ferric phosphate Substances 0.000 title claims abstract description 31
- 229940032958 ferric phosphate Drugs 0.000 title claims abstract description 31
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 title claims abstract description 31
- 229910000399 iron(III) phosphate Inorganic materials 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000005030 aluminium foil Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 239000007774 positive electrode material Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 238000012546 transfer Methods 0.000 abstract description 3
- 239000006200 vaporizer Substances 0.000 abstract description 2
- 239000012530 fluid Substances 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000006229 carbon black Substances 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052493 LiFePO4 Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 229910003002 lithium salt Inorganic materials 0.000 description 2
- 159000000002 lithium salts Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- ZSYNKHJUSDFTCQ-UHFFFAOYSA-N [Li].[Fe].P(O)(O)(O)=O Chemical compound [Li].[Fe].P(O)(O)(O)=O ZSYNKHJUSDFTCQ-UHFFFAOYSA-N 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 201000001371 inclusion conjunctivitis Diseases 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 206010044325 trachoma Diseases 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Secondary Cells (AREA)
- Primary Cells (AREA)
Abstract
The invention discloses a kind of ferric phosphate lithium cell, housing, block including cylindrical shape and the cylinder battery core being contained in housing, the height of the battery core is L, it includes the first end for being electrically connected to housing bottom and the second end for being electrically connected to block, the battery core is additionally provided with the passage through first end and the second end, it is provided with the hollow pipe extended to the second end from first end in the passage, the length of the pipeline is H, and 1L/2≤H≤4L/5.Compared to prior art, the invention has the advantages that：A steel pipe is installed in the battery core of ferric phosphate lithium cell of the present invention, the pipeline can ensure battery in operation irregularity, good heat transfer can also be kept between the two ends of battery core, and if because the temperature of battery core bottom is too high, electrolyte is caused to vaporize, then the vaporizer can also enter the top of battery core by pipeline, it is ensured that pressure is balanced at the two ends of battery core, so as to ensure the trouble free service of battery.
Description
【Technical field】
The present invention relates to new energy field, more particularly to a kind of ferric phosphate lithium cell of electric motor car.
【Background technology】
Energy crisis, shortage of resources, environmental pollution are the three big severe challenges that human survival faces, find it is clean, can be again
The raw, secondary resource of resource-conserving is to realize the human social vital task to be solved.
With expanding economy and the raising of living standards of the people, people are more and more strong to the battery requirements of high-energy-density
Strong, lithium ion battery has the advantages that operating voltage is high, energy density is big, have extended cycle life, self-discharge rate is small, environmental protection,
Trend as secondary cell.It has been widely used in the portable electricity consuming productses such as wireless telecommunications, digital camera, and it is preliminary in aviation, state
It is anti-to wait special dimension extensive use.
LiFePO4 is a kind of positive electrode for making lithium battery, and not only specific capacity is high, particularly its heat endurance it is good, peace
Full superior performance, the outstanding feature of good cycle, it is considered to be the preferable making material of lithium battery anode.
Although ferric phosphate lithium cell has the unrivaled series of advantages of other materials, it there is also some shortcomings
Part, these weak points are mainly relevant with the structure of traditional lithium battery.Although traditional lithium battery is equipped with block
Safety valve, but if battery bottom is short-circuited, then bottom can produce substantial amounts of heat and cause the battery core at bottom in height
The channel blockage of heat transfer when rapid expansion is so as to by initial conditions when warm between battery core bottom and top, so, battery floor
The heat in portion just can not be passed in time, ultimately resulted in over-heat at the bottom and drastically expanded, and pressure is drastically raised or even exploded.
In view of above drawback, is necessary to provide in fact a kind of new ferric phosphate lithium cell to overcome drawbacks described above.
【The content of the invention】
It is an object of the invention to overcome above-mentioned defect, there is provided a kind of to make simple, security performance LiFePO4 high
Battery.
To achieve these goals, the present invention provides a kind of ferric phosphate lithium cell, including the housing of cylindrical shape, block with
And the cylinder battery core in housing is contained in, the height of the battery core is L, its first end for including being electrically connected to housing bottom
Portion and the second end for being electrically connected to block, the battery core are additionally provided with the passage through first end and the second end,
It is provided with the hollow pipe extended to the second end from first end in the passage, the length of the pipeline is H, and 1L/2≤H
≤4L/5。
Improved as one kind of ferric phosphate lithium cell of the present invention, the battery core is that the positive and negative plate of mutual insulating isolation is twined
Around formation.
Improved as one kind of ferric phosphate lithium cell of the present invention, the hollow pipe is in hollow cylindrical, its external diameter with it is logical
Road internal diameter is consistent.
Improved as one kind of ferric phosphate lithium cell of the present invention, the Single port of the hollow pipe is gradually tapered up, the other end
Mouth is in horn-like.
Improved as one kind of ferric phosphate lithium cell of the present invention, the positive plate has plus plate current-collecting body and is coated on positive pole collection
Positive electrode active material on fluid；The negative plate has negative current collector and the negative electrode active material being coated on negative current collector.
Improved as one kind of ferric phosphate lithium cell of the present invention, the plus plate current-collecting body is made of aluminium foil, negative pole currect collecting
Body is made of Copper Foil.
Improved as one kind of ferric phosphate lithium cell of the present invention, lug, the pole are respectively welded on the positive and negative plate
Ear welds together with housing bottom and block respectively.
Improved as one kind of ferric phosphate lithium cell of the present invention, the block is provided with safety valve.
Improved as one kind of ferric phosphate lithium cell of the present invention, the pipeline is made up of steel material.
Compared to prior art, the invention has the advantages that：One is installed in the battery core of ferric phosphate lithium cell of the present invention
Steel pipe, the pipeline can ensure battery in operation irregularity, and good heat transfer can also be kept between the two ends of battery core, and
If because the temperature of battery core bottom is too high, causing electrolyte to vaporize, then the vaporizer can also enter the top of battery core by pipeline
Portion, it is ensured that pressure is balanced at the two ends of battery core, so as to ensure the trouble free service of battery.
【Brief description of the drawings】
Fig. 1 is the three-dimensional exploded view of ferric phosphate lithium cell of the present invention（Battery core is not installed）；
Fig. 2 is the structural representation of the plus plate current-collecting body of ferric phosphate lithium cell of the present invention；
Fig. 3 is the battery core generalized section of ferric phosphate lithium cell of the present invention；
Fig. 4 is the pipeline configuration schematic diagram being related to of ferric phosphate lithium cell of the present invention.
【Specific embodiment】
Refer to shown in Fig. 1 to Fig. 4, the invention will be further described for illustrated embodiment below in conjunction with the accompanying drawings.
The manufacture craft of ferric phosphate lithium cell of the present invention 100, comprises the following steps：1）Dispensing, 2）Coating, 3）Roll-in, 4）
Battery pole piece makes, and 5）Baking, 6）Winding, 7）Tubulature road, 8）Laser Welding, 9）Fluid injection, 10）Chemical conversion, 11）Partial volume；
1）Dispensing：
The anode sizing agent with water as medium is prepared, material requested has：Water system glue, LiFePO4, superconduction carbon black, conductive stone
Be added to the water for water system glue and be stirred dilution by ink, lithium salts, adds superconduction carbon black and electrically conductive graphite stirring, is eventually adding phosphoric acid
Iron lithium and lithium salts stir into slurry；
The cathode size with water as medium is prepared, material requested has：Graphite, sodium carboxymethylcellulose, superconduction carbon black, water system
Glue, stirring is added to the water by sodium carboxymethylcellulose, after staticly settling, adds water system glue, superconduction carbon black, graphite to stir into slurry
Material；
2）Coating
Positive pole and cathode size after filtering is uniformly coated on corresponding plus plate current-collecting body 21 and negative pole currect collecting respectively
On body, and uncoated region is reserved, as lug area, be then placed in coating machine oven baking, the linear velocity anode collection of coating
Body is 4.5 meters per minute, and negative current collector is 5 meters per minute, after the completion of coating baking, each pole piece is cut into slices；In this hair
In bright, the plus plate current-collecting body is made of aluminium foil, and negative current collector is made of Copper Foil, is coated with used slurry and is respectively
Positive electrode active material and negative electrode active material.
3）Roll-in
Roll process, by positive plate roll-in to thickness at 115 μm -140 μm, compacted density is in 1.9g/cm3-2.3g/cm3;
By negative plate roll-in to thickness at 75 μm -90 μm, compacted density is in 1.3g/cm3-1.6g/cm3；
4）Battery pole piece makes；
Positive plate is cut into three rectangular sheets of lug, and negative pole is cut into three rectangular sheets of lug；
5) toast
Section is toasted, is toasted 24 hours in vacuum oven, vacuum is not less than -0.08Mpa, and baking temperature is
100 degree, every ventilation in 2-4 hours once, kept for 30 minutes after ventilation, then vacuumized again, baking time terminates, temperature drop
As little as less than 45 degree, baking box is taken out into section, be then transferred to subsequent processing.
6）Winding
Positive/negative plate is placed in the groove of up- coiler, is wound, it is the cylindrical shape of L that winding forms height.In winding
During, it is necessary to assure the two is dielectrically separated from.The battery core 20 of the cylindrical shape can be divided into the end of first end 23 and second
Portion 24, it is additionally provided with the passage 22 through first end and the second end, after with adhesive tape by battery core wind one enclose.
7）Tubulature road
Take in the hollow pipe 40 of hollow cylindrical, the length of the hollow pipe 40 is H, and 1L/2≤H≤4L/5.Will
The pipeline 40 is inserted up to all submerging in passage 22 from the passage of battery core first end 23.
Certainly, in actually manufacture, in order to prevent hollow cylindrical from can be slided up and down after inserting passage, therefore, in design,
Can not only require to be designed as the external diameter of hollow pipe 40 and the internal diameter of passage 22 it is consistent, can also be by the end of hollow pipe 40
The design of mouth 41 is in horn-like.For the convenience in tubulature road, generally also the port 42 of the insertion end of hollow pipe is designed as gradually
The shape of contraction.
8）Laser Welding
Battery core 20 is loaded in aluminium casing 10, then using ultrasonic welding machine by negative pole lug welding to the bottom of housing 10
Portion, then positive pole is soldered to the safe valve position of block 30 with electric resistance welding.In welding process, it is ensured that weld smooth, nothing
Trachoma, rosin joint.
9）Fluid injection
Battery liquid-filling uses semi-automatic vacuum liquid injecting machine fluid injection, and high-purity argon gas, lithium ion battery are passed through while fluid injection
Reservoir quantity need to be according to its calculation of capacity, its reservoir quantity is about 7g/Ah;The electrolyte for being used for the LiPF6/EC of 1M, DMC,
EMC, the environmental Kuznets Curves of fluid injection are extremely important, therefore needs complete fluid injection in glove box, and fluid injection is generally from the fluid injection of battery container
Upper injection.
10）Chemical conversion
Formation process must be completed disposably incessantly, and chemical conversion curve should be smoothly connected, and current control is in 0.1A/
30min、0.25A/120min、0.35A/300min。
11）Partial volume
Electrical property indices are met the battery and every electrical performance indexes not up to technological requirement of technological requirement
Battery is separated, and is respectively implanted in storehouse.
The present invention is existed using the distinguishing feature that the ferric phosphate lithium cell 100 that above-mentioned technique makes has with traditional lithium battery
In：Although traditional lithium battery is also to cover block again after cylinder battery core is housed in into housing, traditional lithium battery is only
Path when only relying on to form battery core through battery core bottom and top ensures the thermal cycle between battery core bottom and top, however,
In actual use, in the event of the battery core short circuit of bottom, then the battery core of bottom will rapidly expand and block any logical
To the path at the top of battery core, causing bottom to gather substantial amounts of heat cannot discharge, and electrolyte liquefies rapidly, or even can explode
Accident.But due to inserting the pipeline 40 of a steel in battery core of the invention 20, so as to the first end of battery core 20 can be ensured
23 are formed through thermal cycle all the time with the second end 24, even and if because the high temperature of the bottom of battery core 20 rises, cause electricity
The electrolyte of the bottom of core 20 liquefies rapidly, then foregoing liquefied substance also can be by the way that pipeline 40 is into the top of battery core and finally rushes
Drive safety valve, it is ensured that the security that battery is used.
A kind of ferric phosphate lithium cell of the present invention, is not restricted to described in specification and implementation method, therefore for
Additional advantage and modification are easily achieved for the personnel of familiar field, therefore without departing substantially from claim and equivalency range institute
In the case of the spirit and scope of the universal of restriction, the present invention be not limited to specific details, representational equipment and this
In show and describe examples shown.
Claims (7)
1. a kind of ferric phosphate lithium cell, it is characterised in that：Housing that it includes cylindrical shape, block and it is contained in housing
Cylinder battery core, the height of the battery core is L, and it includes being electrically connected to the first end of housing bottom and is electrically connected to lid
The second end of cap, the battery core is additionally provided with the passage through first end and the second end, is provided with the passage certainly
The hollow pipe that first end extends to the second end, the length of the pipeline is H, and 1L/2≤H≤4L/5, the hollow pipe
The Single port in road is gradually tapered up, and another port is in horn-like.
2. ferric phosphate lithium cell as claimed in claim 1, it is characterised in that：The battery core is the positive and negative of mutual insulating isolation
Pole piece is wound.
3. ferric phosphate lithium cell as claimed in claim 2, it is characterised in that：The positive plate has plus plate current-collecting body and is coated on
Positive electrode active material on plus plate current-collecting body；The negative plate has negative current collector and the negative electrode active being coated on negative current collector
Thing.
4. ferric phosphate lithium cell as claimed in claim 3, it is characterised in that：The plus plate current-collecting body is made of aluminium foil, is born
Pole collector is made of Copper Foil.
5. ferric phosphate lithium cell as claimed in claim 2, it is characterised in that：Lug is respectively welded on the positive and negative plate,
The lug welds together with housing bottom and block respectively.
6. ferric phosphate lithium cell as claimed in claim 1, it is characterised in that：The block is provided with safety valve.
7. any ferric phosphate lithium cell as described in claim 1 to 6, it is characterised in that：The pipeline is made up of steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210181044.XA CN103456979B (en) | 2012-06-04 | 2012-06-04 | Ferric phosphate lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210181044.XA CN103456979B (en) | 2012-06-04 | 2012-06-04 | Ferric phosphate lithium cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103456979A CN103456979A (en) | 2013-12-18 |
| CN103456979B true CN103456979B (en) | 2017-07-07 |
Family
ID=49739117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210181044.XA Active CN103456979B (en) | 2012-06-04 | 2012-06-04 | Ferric phosphate lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103456979B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202678471U (en) * | 2012-06-04 | 2013-01-16 | 深圳市沃特玛电池有限公司 | Lithium iron phosphate battery |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5571632A (en) * | 1994-06-22 | 1996-11-05 | Sony Corporation | Nonaqueous electrolyte solution secondary cell and method for producing the same |
| JP4159301B2 (en) * | 2001-11-28 | 2008-10-01 | 三洋電機株式会社 | Sealed battery |
| JP2009218013A (en) * | 2008-03-07 | 2009-09-24 | Sanyo Electric Co Ltd | Sealed battery |
| CN201503876U (en) * | 2009-08-25 | 2010-06-09 | 深圳市慧通天下科技股份有限公司 | Battery case and battery employing same |
-
2012
- 2012-06-04 CN CN201210181044.XA patent/CN103456979B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202678471U (en) * | 2012-06-04 | 2013-01-16 | 深圳市沃特玛电池有限公司 | Lithium iron phosphate battery |
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| CN103456979A (en) | 2013-12-18 |
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