CN103247818A - Flexible-packaging laminated lithium iron phosphate cell with high specific energy and manufacturing method thereof - Google Patents
Flexible-packaging laminated lithium iron phosphate cell with high specific energy and manufacturing method thereof Download PDFInfo
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- CN103247818A CN103247818A CN2012100297080A CN201210029708A CN103247818A CN 103247818 A CN103247818 A CN 103247818A CN 2012100297080 A CN2012100297080 A CN 2012100297080A CN 201210029708 A CN201210029708 A CN 201210029708A CN 103247818 A CN103247818 A CN 103247818A
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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
Abstract
The invention relates to a flexible-packaging laminated lithium iron phosphate cell with high specific energy and a manufacturing method thereof. The cell provided by the invention is characterized in that the cell comprises a cell case; an anode pole piece and a cathode pole piece are arranged inside the cell case; a diaphragm layer is arranged between the anode pole piece and the cathode pole piece; micropores are distributed on the diaphragm layer; meanwhile, an anode lead is connected on the anode pole piece and a cathode lead is connected on the cathode pole piece; an independent insulation film is respectively arranged at a juncture of the anode pole piece and the cell case and at the juncture of the cathode pole piece and the cell case; and an electrolyte is disposed inside the cell case. According to the invention, lithium iron phosphate which has characteristics of stable structure, environmentally friendly performance, good security, high specific capacity, long cycle life and the like is used as an anode layer, a graphite layer is used to form a cathode layer, and a plastic-aluminum film case which has good flexibility is used to prepare the flexible-packaging lithium iron phosphate cell. Environmental pollution is reduced, size and quality of the cell are greatly decreased, and mass specific energy of the cell is raised.
Description
Technical field
The present invention relates to a kind of Battery And Its Manufacturing Methods, relate in particular to the stacked ferric phosphate lithium cell of a kind of high-energy-density flexible package and manufacture method thereof.
Background technology
At present, diversified day by day electronic product is just towards miniaturization, portability, functional diversities development on the market, while is along with the exhaustion day by day of resources such as oil, coal, therefore the electric automobile industry is also constantly being captured market, and the performance requirement to lithium ion battery that energy is provided for these products is also more and more higher.Not only require the operating voltage height, fail safe is good, capacity is high, requires also simultaneously that it is in light weight, volume is little, namely the specific energy of battery wants high.Traditional is the lithium ion battery of positive pole with cobalt acid lithium material, can not satisfy comprehensive requirement, the especially fail safe of above-mentioned development, therefore needs to select a kind of better, safe positive electrode.Compare with traditional box hat battery simultaneously, flexible-packed battery is because its shell is softer aluminum plastic film, makes its easier miniaturization, thereby obtains the lithium battery than high-energy-density.
Summary of the invention
Purpose of the present invention is exactly in order to solve the above-mentioned problems in the prior art, and the stacked ferric phosphate lithium cell of a kind of high-energy-density flexible package and manufacture method thereof are provided.
Purpose of the present invention is achieved through the following technical solutions:
The stacked ferric phosphate lithium cell of high-energy-density flexible package, include battery case, wherein: be provided with anode pole piece and cathode pole piece in the described battery case, be provided with membrane layer between described anode pole piece and the cathode pole piece, be distributed with micropore on the described membrane layer, be connected with positive pole ear on the described anode pole piece, be connected with negative lug on the described cathode pole piece, the junction of described positive pole ear, negative lug and battery case is provided with independently dielectric film, is provided with electrolyte in the described battery case.
The above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described membrane layer is the combined type membrane layer, includes main polypropylene layer, is distributed with polyethylene layer on the described main polypropylene layer, is distributed with secondary polypropylene layer on the described polyethylene layer.
Further, the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described battery case is the aluminum plastic film cover layer.
Further, the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described electrolyte is organic liquid electrolyte, includes LiPF
6Among electrolyte, EC, PC, DMC, EMC, the EP one or more.
Further, the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described anode pole piece is the LiFePO4 layer, described cathode pole piece is graphite linings.
Again further, the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: the granularity D of described LiFePO4 layer
50Be 2-6 μ m, specific surface is 11-15m
2/ g, described graphite linings granularity D
50Be 16.5-19 μ m, specific surface is 0.8-1.5m
2/ g.
The manufacture method of the stacked ferric phosphate lithium cell of high-energy-density flexible package, it may further comprise the steps:
Step 1., be the LiFePO 4 material of 87%-96%, the conductive agent of 1%-7% and the binding agent of 1%-7% with the quality proportioning, be dispersed in and make anodal creme in the solvent, be collector with the thick aluminium foil of 8-18 μ m, be applied on the aluminium foil positive and negative uniformly creme and drying, roll through roller press, make anode pole piece; Step 2., be that the thickener of the binding agent of conductive agent, 0.5%-5% of graphite material, the 0.5%-5% of 87%-96% and 0.5%-5% is dispersed in and makes the negative pole creme in the solvent with the quality proportioning, be collector with the thick Copper Foil of 8-12 μ m, be applied on the Copper Foil positive and negative uniformly creme and drying, roll through roller press, make cathode pole piece; 3. step gets up to constitute electric core according to the sequential cascade of membrane layer, cathode pole piece, membrane layer, anode pole piece, encases electric core and sticks the termination adhesive tape with membrane layer; Step 4., the lug of burn-oning with the encapsulation of aluminum plastic film battery case, is annotated electrolyte, seals.
The manufacture method of the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described anode pole piece and cathode pole piece design size on demand, section punching.
Further, the manufacture method of the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described conductive agent is the mixture of conductive black or conductive black and electrically conductive graphite.
Further, the manufacture method of the above-mentioned stacked ferric phosphate lithium cell of high-energy-density flexible package, wherein: described binding agent is Kynoar or butadiene-styrene rubber, described solvent be N-methyl pyrrolidone or pure water, described thickener is sodium carboxymethylcellulose.
The advantage of technical solution of the present invention is mainly reflected in: the LiFePO4 of characteristics such as rely on Stability Analysis of Structures, environmental friendliness, fail safe is good, specific capacity is high, have extended cycle life is done anodal layer, rely on the negative electrode layer that graphite linings constitutes, the aluminum plastic film battery case that has good flexibility by use is made the flexible package ferric phosphate lithium cell, reduce environmental pollution and significantly reduced volume of battery and quality, thereby improved the specific energy of battery and performance that volumetric specific energy has been improved battery, reduced the battery cost.
Description of drawings
Purpose of the present invention, advantage and characteristics will illustrate by the non-limitative illustration of following preferred embodiment and explain.These embodiment only are the prominent examples of using technical solution of the present invention, and all technical schemes of taking to be equal to replacement or equivalent transformation and forming all drop within the scope of protection of present invention.In the middle of these accompanying drawings,
Fig. 1 is the overall schematic of the stacked ferric phosphate lithium cell of high-energy-density flexible package;
The distribution schematic diagram of Fig. 2 anode pole piece and cathode pole piece.
1 positive pole ear, 2 negative lug
3 dielectric films, 4 battery cases
5 anode pole pieces, 6 cathode pole pieces
7 membrane layers
Embodiment
The stacked ferric phosphate lithium cell of high-energy-density flexible package as shown in Figure 1 and Figure 2 includes battery case 4, it is characterized in that: be provided with anode pole piece 5 and cathode pole piece 6 in the battery case 4 of the present invention.Specifically, between anode pole piece 5 and cathode pole piece 6, be provided with membrane layer 7.Simultaneously, be distributed with micropore on the membrane layer 7.And, for being connected of follow-up electricity consumption device, be connected with positive pole ear 1 at anode pole piece 5.Corresponding is to be connected with negative lug 2 on the cathode pole piece 6 with it.Moreover positive pole ear 1, negative lug 2 are provided with independently dielectric film 3 with the junction of battery case 4, and are provided with electrolyte in the battery case 4.
With regard to the present invention's one preferred implementation, for the ease of improving the insulation degree, the membrane layer 7 that the present invention adopts is combined type membrane layer 7, includes main polypropylene layer, is distributed with polyethylene layer on the main polypropylene layer, is distributed with secondary polypropylene layer on the polyethylene layer.Simultaneously, for improving firm degree, be the aluminum plastic film cover layer at battery case 4.
Further, in order to improve the operating efficiency of electrolyte, the electrolyte of employing is organic liquid electrolyte, includes LiPF
6Among electrolyte, EC, PC, DMC, EMC, the EP one or more.Simultaneously, anode pole piece is the LiFePO4 layer, and cathode pole piece is graphite linings.
And, for the ease of making the granularity D of LiFePO4 layer
50Be 2-6 μ m, specific surface is 11-15m
2/ g.Correspondence is graphite linings granularity D with it
50Be 16.5-19 μ m, specific surface is 0.8-1.5m
2/ g.
In conjunction with actual manufacturing situation of the present invention, at first, be the LiFePO 4 material of 87%-96%, the conductive agent of 1%-7% and the binding agent of 1%-7% with the quality proportioning, be dispersed in and make anodal creme in the solvent, be collector with the thick aluminium foil of 8-18 μ m, be applied on the aluminium foil positive and negative uniformly creme and drying, roll through roller press, make anode pole piece.
Then, be that the thickener of the binding agent of conductive agent, 0.5%-5% of graphite material, the 0.5%-5% of 87%-96% and 0.5%-5% is dispersed in and makes the negative pole creme in the solvent with the quality proportioning, be collector with the thick Copper Foil of 8-12 μ m, be applied on the Copper Foil positive and negative uniformly creme and drying, roll through roller press, make cathode pole piece.Simultaneously, the single face surface density of positive plate coating is 120-180g/m
2, the single face surface density of negative plate coating is 50-90g/m
2
Subsequently, get up to constitute electric core according to the sequential cascade of membrane layer, cathode pole piece, membrane layer, anode pole piece, encase electric core and stick the termination adhesive tape with membrane layer.
At last, the lug of burn-oning with the encapsulation of aluminum plastic film battery case, is annotated electrolyte, seals.
Specifically, consider the unification of specification, anode pole piece and cathode pole piece design size on demand, section punching.Simultaneously, in order to improve the conductive effect of conductive agent, the conductive agent of employing is the mixture of conductive black or conductive black and electrically conductive graphite.And in order to promote cementation, binding agent is Kynoar or butadiene-styrene rubber.Same, in order to satisfy the instructions for use of solvent, solvent be N-methyl pyrrolidone or pure water.Moreover, consider to allow the thickening of thickener appropriate that thickener is sodium carboxymethylcellulose.
Result of use of the present invention is as follows: the discharge capacity of battery under the 1C discharge-rate can reach 10Ah.The specific energy of battery under the 0.2C discharge-rate reaches 132Wh/kg.Battery is after circulation under the 1C charge-discharge magnification 190 times, and its capability retention is up to 95.5%.
By above-mentioned character express as can be seen, after adopting the present invention, the LiFePO4 of characteristics such as rely on Stability Analysis of Structures, environmental friendliness, fail safe is good, specific capacity is high, have extended cycle life is done anodal layer, rely on the negative electrode layer that graphite linings constitutes, the aluminum plastic film battery case that has good flexibility by use is made the flexible package ferric phosphate lithium cell, reduce environmental pollution and significantly reduced volume of battery and quality, thereby improved the specific energy of battery and performance that volumetric specific energy has been improved battery, reduced the battery cost.
Claims (10)
1. the stacked ferric phosphate lithium cell of high-energy-density flexible package, include battery case, it is characterized in that: be provided with anode pole piece and cathode pole piece in the described battery case, be provided with membrane layer between described anode pole piece and the cathode pole piece, be distributed with micropore on the described membrane layer, be connected with positive pole ear on the described anode pole piece, be connected with negative lug on the described cathode pole piece, the junction of described positive pole ear, negative lug and battery case is provided with independently dielectric film, is provided with electrolyte in the described battery case.
2. the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 1, it is characterized in that: described membrane layer is the combined type membrane layer, include main polypropylene layer, be distributed with polyethylene layer on the described main polypropylene layer, be distributed with secondary polypropylene layer on the described polyethylene layer.
3. the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 1, it is characterized in that: described battery case is the aluminum plastic film cover layer.
4. the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 1, it is characterized in that: described electrolyte is organic liquid electrolyte, includes LiPF
6Among electrolyte, EC, PC, DMC, EMC, the EP one or more.
5. the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 1, it is characterized in that: described anode pole piece is the LiFePO4 layer, described cathode pole piece is graphite linings.
6. the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 5 is characterized in that: the granularity D of described LiFePO4 layer
50Be 2-6 μ m, specific surface is 11-15m
2/ g, described graphite linings granularity D
50Be 16.5-19 μ m, specific surface is 0.8-1.5m
2/ g.
7. the manufacture method of the stacked ferric phosphate lithium cell of high-energy-density flexible package is characterized in that may further comprise the steps:
Step 1., be the LiFePO 4 material of 87%-96%, the conductive agent of 1%-7% and the binding agent of 1%-7% with the quality proportioning, be dispersed in and make anodal creme in the solvent, be collector with the thick aluminium foil of 8-18 μ m, be applied on the aluminium foil positive and negative uniformly creme and drying, roll through roller press, make anode pole piece;
Step 2., be that the thickener of the binding agent of conductive agent, 0.5%-5% of graphite material, the 0.5%-5% of 87%-96% and 0.5%-5% is dispersed in and makes the negative pole creme in the solvent with the quality proportioning, be collector with the thick Copper Foil of 8-12 μ m, be applied on the Copper Foil positive and negative uniformly creme and drying, roll through roller press, make cathode pole piece;
3. step gets up to constitute electric core according to the sequential cascade of membrane layer, cathode pole piece, membrane layer, anode pole piece, encases electric core and sticks the termination adhesive tape with membrane layer;
Step 4., the lug of burn-oning with the encapsulation of aluminum plastic film battery case, is annotated electrolyte, seals.
8. the manufacture method of the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 7 is characterized in that: described anode pole piece and cathode pole piece design size on demand, section punching.
9. the manufacture method of the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 7, it is characterized in that: described conductive agent is the mixture of conductive black or conductive black and electrically conductive graphite.
10. the manufacture method of the stacked ferric phosphate lithium cell of high-energy-density flexible package according to claim 7, it is characterized in that: described binding agent is Kynoar or butadiene-styrene rubber, described solvent be N-methyl pyrrolidone or pure water, described thickener is sodium carboxymethylcellulose.
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| CN105355807A (en) * | 2015-12-15 | 2016-02-24 | 重庆裕祥新能源电池有限公司 | Lithium battery cell for motorcycle and manufacturing process of lithium battery cell |
| CN106711511A (en) * | 2017-01-20 | 2017-05-24 | 东莞市迈科新能源有限公司 | Method for manufacturing laminated type soft battery cell for in-situ XRD (X-Ray Diffraction) testing |
| CN111313081A (en) * | 2020-02-28 | 2020-06-19 | 浙江克能新能源科技有限公司 | Soft-package lithium iron phosphate battery and manufacturing method thereof |
| CN113471437A (en) * | 2021-06-18 | 2021-10-01 | 力博特电源科技（广州）有限公司 | Method for improving density of lithium iron phosphate battery |
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