CN111786010A - Multiplying power type lithium ion battery - Google Patents
Multiplying power type lithium ion battery Download PDFInfo
- Publication number
- CN111786010A CN111786010A CN202010716421.XA CN202010716421A CN111786010A CN 111786010 A CN111786010 A CN 111786010A CN 202010716421 A CN202010716421 A CN 202010716421A CN 111786010 A CN111786010 A CN 111786010A
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- Prior art keywords
- positive
- tab
- negative
- lithium ion
- battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 claims description 10
- 229920006255 plastic film Polymers 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 238000004804 winding Methods 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000007773 negative electrode material Substances 0.000 claims description 6
- 239000007774 positive electrode material Substances 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 238000012983 electrochemical energy storage Methods 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 claims description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 abstract description 7
- 238000007599 discharging Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect 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
- 230000010287 polarization Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a rate type lithium ion battery, which is characterized in that: the battery comprises a positive tab and a negative tab which are respectively positioned at two sides of the battery, the thicknesses of metal sheets of the positive tab and the negative tab are gradually reduced towards the edge direction along the edges near the two sides, the width of the positive tab accounts for more than 2/3 of the total width of the battery, and the thickness of the non-thinned part of the positive tab is at least 0.5 mm; compared with standard charging and discharging under the 1C multiplying power, the battery has the advantages that the capacity retention rate can still exceed 90% when the charging multiplying power reaches 8C or the discharging multiplying power reaches 10C, the structure is stable, and the over-current capacity of the battery is improved.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a rate type lithium ion battery.
Background
Lithium ion batteries widely used in power and electrochemical energy storage in the market pay more attention to the energy density of the batteries, so that the energy density is improved by adjusting the battery structure, increasing the thickness of a pole piece, increasing the compaction density of an active material, reducing the weight of a foil and an auxiliary material and the like, but the polarization phenomenon in the work of the batteries is aggravated usually, and meanwhile, the multiplying power performance of the batteries is limited because the width of a pole lug is limited due to the fact that the pole lug is led out from the same side in most battery structures.
At present, the rate performance of most types of power and electrochemical energy storage lithium ion batteries meets 1C charge and discharge, and the rate performance of a few types of power and electrochemical energy storage lithium ion batteries can reach 2C charge and discharge. In order to meet the requirements of quick charge or high-power discharge of high-rate 10C, materials need to be selected reasonably, and meanwhile, special design needs to be carried out on high-rate charge and discharge structurally.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a rate type lithium ion battery which is reasonable in structure, convenient and fast.
In order to solve the technical problems, the technical scheme of the invention is as follows: the multiplying power type lithium ion battery comprises a positive tab and a negative tab which are respectively positioned on two sides of the battery, the thicknesses of metal sheets of the positive tab and the negative tab are gradually reduced towards the edge direction along the edges near the two sides, the width of the positive tab accounts for more than 2/3 of the total width of the battery, the thickness of the non-thinned part of the positive tab is at least 0.5mm, and compared with standard charging and discharging under the multiplying power of 1C, the capacity retention rate can still exceed 90% when the charging multiplying power reaches 8C or the discharging multiplying power reaches 10C.
Further, the battery structure comprises the positive electrode tab, the negative electrode tab, a positive plate, a negative plate, a diaphragm, an aluminum-plastic film and electrolyte; the positive electrode tab and the negative electrode tab are respectively welded on the positive plate and the negative plate and extend reversely, and the positive plate and the negative plate are combined in a winding or lamination mode through the diaphragm. The aluminum plastic film is surrounded on the periphery of the battery cell main body which is formed by the positive and negative electrode lugs, the diaphragm and the positive and negative plates.
Further, the positive tab is an aluminum metal sheet, and the negative tab is a copper metal sheet or a copper metal sheet with nickel plated on the surface; the middle of the front and back sides of the positive and negative electrode lugs is respectively provided with a polyethylene lug glue for heat-sealing the lug and the aluminum plastic film together; the tab glue is symmetrically arranged on both sides of the positive and negative tabs, and the parts extending out of the tab metal sheets are tightly attached to each other.
Further, the positive plate is coated with coatings containing positive active materials on the front and back surfaces of the aluminum foil with the carbon coated on the two surfaces, and the positive active materials are lithium iron phosphate or lithium cobaltate or other ternary positive materials; the negative plate is coated with a coating containing a negative active material on the front surface and the back surface of the copper foil, and the negative active material is graphite or a silicon-carbon negative electrode or is doped with the graphite or the silicon-carbon negative electrode.
Further, the positive plate and the negative plate ensure that the porosity is not less than 30% and not more than 40% by controlling the compaction density.
Further, the diaphragm is a wet diaphragm, and the air permeability range is 150 +/-30 s/100 ml.
Further, the battery is a winding type soft package battery or a laminated type soft package battery.
Compared with the prior art, the invention has the following beneficial effects: the structure that the positive and negative electrode lugs are respectively led out from two sides is adopted, the designed width of the lugs is increased, and the aluminum lug with the thickness of 0.5mm ensures larger current-carrying area, so that the over-current capacity of the battery is improved; the edges of the tab metal sheets are thinned, so that the phenomenon that short circuit or liquid leakage is caused due to poor packaging caused by steps formed at the edges during packaging due to overhigh tab thickness is avoided; the pole piece is designed, the compaction density is adjusted, and the porosity of the positive pole piece and the negative pole piece is controlled to be 30-40%; the diaphragm adopts a wet diaphragm with air permeability in the range of 150 +/-30 s/100 ml.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention;
fig. 2 is a side view and a top view of a tab and tab glue connection in an embodiment of the invention;
FIG. 3 is a schematic diagram of the internal structure of a wound battery according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the connection between the positive and negative electrode plates and the diaphragm in the embodiment of the present invention.
In the figure: 1-positive tab, 2-negative tab, 3-positive plate, 4-negative plate, 5-diaphragm, 6-aluminum plastic film, 7-tab glue, 8-cell main body and 9-thinning area.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 4, the rate lithium ion battery includes a positive tab 1 and a negative tab 2 respectively located at two sides of the battery, the thicknesses of the metal sheets of the positive tab and the negative tab are gradually reduced towards the edge direction along the edges near the two sides, the width of the positive tab accounts for more than 2/3 of the total width of the battery, the thickness of the non-thinned part of the positive tab is at least 0.5mm, the battery is subjected to standard charging and discharging under 1C rate, the capacity retention rate can still exceed 90% when the charging rate reaches 8C or the discharging rate reaches 10C, the tab is cut and thinned into a rhomboid shape by adopting symmetrical cutting, the two sides form thinned regions 9, and the width of the thinned regions is not less than 1 cm.
In the embodiment of the invention, the battery structure comprises the positive tab, the negative tab, the positive plate 3, the negative plate 4, the diaphragm 5, the aluminum plastic film 6 and electrolyte; the positive electrode tab and the negative electrode tab are respectively welded on the positive plate and the negative plate and extend reversely, and the positive plate and the negative plate are combined in a winding or lamination mode through the diaphragm. The aluminum-plastic film is surrounded on the periphery of the battery cell main body 8 which is formed by the positive and negative electrode lugs, the diaphragm and the positive and negative plates.
In the embodiment of the invention, the positive tab is an aluminum metal sheet, and the negative tab is a copper metal sheet or a copper metal sheet with nickel plated on the surface; a polyethylene tab glue 7 is respectively stuck in the middle of the front and back sides of the positive and negative electrode tabs and used for heat-sealing the tab and the aluminum plastic film together; the tab glue is symmetrically arranged on both sides of the positive and negative tabs, and the parts extending out of the tab metal sheets are tightly attached to each other.
In the embodiment of the invention, the positive plate is coated with coatings containing positive active materials on the front and back surfaces of an aluminum foil with double-sided carbon coating, and the positive active materials are lithium iron phosphate or lithium cobaltate or other ternary positive materials; the negative plate is coated with a coating containing a negative active material on the front surface and the back surface of the copper foil, and the negative active material is graphite or a silicon-carbon negative electrode or is doped with the graphite or the silicon-carbon negative electrode.
In the embodiment of the present invention, the positive electrode sheet and the negative electrode sheet ensure a porosity of not less than 30% and not more than 40% by controlling the compaction density.
In the embodiment of the invention, the diaphragm is a wet diaphragm, and the air permeability range is 150 +/-30 s/100 ml.
In an embodiment of the invention, the battery is a winding type soft package battery or a laminated type soft package battery.
Specific example 1: a soft package lithium ion battery with the capacity of 60Ah is manufactured by adopting a winding process, and the external dimension is width multiplied by height multiplied by thickness =300mm multiplied by 500mm multiplied by 15 mm. The width of the positive lug 3 is about 250mm, the thinning areas are 20mm respectively, and the thickness of the metal sheet is 0.5 mm; the width of the negative electrode tab 4 is 200mm, and the thickness of the metal sheet is 0.4 mm. The positive and negative electrode tabs are all positioned at the center in the width direction. And calculating the compaction density of the pole piece according to the real density and the proportion of various materials used for the positive pole piece coating and the negative pole piece coating and by taking the theoretical average porosity of 35 percent as a standard, and manufacturing the pole piece according to the standard. The finished product battery cell meets the requirements of 93 percent of 10C discharge capacity retention rate and 90 percent of 8C charge capacity retention rate.
Specific example 2: a soft package lithium ion battery with the capacity of 30Ah is manufactured by adopting a lamination type process, and the external dimension is that the width is multiplied by the height and the thickness is =200mm multiplied by 400mm multiplied by 12 mm. The width of the positive lug 3 is 15mm in the thinning areas of about 160mm, and the thickness of the metal sheet is 0.5 mm; the width of the negative electrode tab 4 is 160mm, and the thickness of the metal sheet is 0.3 mm. The positive and negative electrode lugs are positioned on one side in the width direction and are centrosymmetric. And calculating the compaction density of the pole piece according to the real density and the proportion of various materials used for the positive pole piece coating and the negative pole piece coating and by taking the theoretical average porosity of 33 percent as a standard, and manufacturing the pole piece according to the standard. The finished product battery cell meets the requirements of 92% of 10C discharge capacity retention rate and 91% of 8C charge capacity retention rate.
The present invention is not limited to the above-described preferred embodiments, and any other various types of rate lithium ion batteries can be obtained according to the teaching of the present invention. All equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.
Claims (8)
1. The multiplying power type lithium ion battery is characterized in that: the battery comprises a positive tab and a negative tab which are respectively positioned on two sides of the battery, the metal sheets of the positive tab and the negative tab are gradually reduced in thickness towards the edge direction along the edges close to the two sides, the width of the positive tab accounts for more than 2/3 of the total width of the battery, and the thickness of the non-thinned part of the positive tab is at least 0.5 mm.
2. The rate type lithium ion battery according to claim 1, wherein: the battery structure comprises the positive tab, the negative tab, a positive plate, a negative plate, a diaphragm, an aluminum plastic film and electrolyte; the positive electrode tab and the negative electrode tab are respectively welded on the positive plate and the negative plate and extend reversely, and the positive plate and the negative plate are combined in a winding or laminating manner through the diaphragm; the aluminum plastic film is surrounded on the periphery of the battery cell main body which is formed by the positive and negative electrode lugs, the diaphragm and the positive and negative plates.
3. The rate type lithium ion battery according to claim 2, wherein: the positive tab is an aluminum metal sheet, and the negative tab is a copper metal sheet or a copper metal sheet with nickel plated on the surface; the middle of the front and back sides of the positive and negative electrode lugs is respectively provided with a polyethylene lug glue for heat-sealing the lug and the aluminum plastic film together; the tab glue is symmetrically arranged on both sides of the positive and negative tabs, and the parts extending out of the tab metal sheets are tightly attached to each other.
4. The rate type lithium ion battery according to claim 3, wherein: the positive plate is characterized in that coatings containing positive active materials are coated on the front surface and the back surface of the aluminum foil with double carbon-coated surfaces, and the positive active materials are lithium iron phosphate or lithium cobaltate or other ternary positive materials; the negative plate is coated with a coating containing a negative active material on the front surface and the back surface of the copper foil, and the negative active material is graphite or a silicon-carbon negative electrode or is doped with the graphite or the silicon-carbon negative electrode.
5. The rate type lithium ion battery according to claim 2, wherein: the positive plate and the negative plate ensure that the porosity is not less than 30% and not more than 40% by controlling the compaction density.
6. The rate type lithium ion battery according to claim 2, wherein: the diaphragm is a wet diaphragm, and the air permeability range is 150 +/-30 s/100 ml.
7. The rate type lithium ion battery according to claim 1, wherein: the battery is a winding type soft package battery or a laminated type soft package battery.
8. The rate type lithium ion battery according to claim 1, wherein: the application of the rate type lithium ion battery of any one of claims 1-7 in power batteries and electrochemical energy storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716421.XA CN111786010B (en) | 2020-07-23 | 2020-07-23 | Multiplying power type lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010716421.XA CN111786010B (en) | 2020-07-23 | 2020-07-23 | Multiplying power type lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111786010A true CN111786010A (en) | 2020-10-16 |
| CN111786010B CN111786010B (en) | 2024-03-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010716421.XA Active CN111786010B (en) | 2020-07-23 | 2020-07-23 | Multiplying power type lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111786010B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531296A (en) * | 2020-11-26 | 2021-03-19 | 惠州亿纬集能有限公司 | Tab and soft package battery |
| CN114597598A (en) * | 2022-02-22 | 2022-06-07 | 岚图汽车科技有限公司 | Power battery and vehicle |
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|---|---|---|---|---|
| JP2006147534A (en) * | 2004-10-22 | 2006-06-08 | Nissan Motor Co Ltd | Bipolar battery, battery pack and vehicle loaded with them |
| WO2007065322A1 (en) * | 2005-12-09 | 2007-06-14 | Citic Guoan Mengguli New Energy Technology Co., Ltd. | Lithium-ion storage battery with flexible external material of cylindric aluminum-plastic laminated film |
| CN101227015A (en) * | 2007-12-25 | 2008-07-23 | 天津力神电池股份有限公司 | Cylinder type lithium ion battery with high power rate and high safety performance |
| CN201616479U (en) * | 2009-11-16 | 2010-10-27 | 河南比得力高新能源科技有限公司 | Multi-electrode lug lithium ion battery |
| CN207265150U (en) * | 2017-09-26 | 2018-04-20 | 东莞市聚和新能源有限公司 | A kind of high-multiplying power discharge polymer Li-ion battery |
| WO2019024873A1 (en) * | 2017-08-01 | 2019-02-07 | 格力电器（武汉）有限公司 | Soft pack lithium ion battery and manufacturing method therefor |
-
2020
- 2020-07-23 CN CN202010716421.XA patent/CN111786010B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006147534A (en) * | 2004-10-22 | 2006-06-08 | Nissan Motor Co Ltd | Bipolar battery, battery pack and vehicle loaded with them |
| WO2007065322A1 (en) * | 2005-12-09 | 2007-06-14 | Citic Guoan Mengguli New Energy Technology Co., Ltd. | Lithium-ion storage battery with flexible external material of cylindric aluminum-plastic laminated film |
| CN101227015A (en) * | 2007-12-25 | 2008-07-23 | 天津力神电池股份有限公司 | Cylinder type lithium ion battery with high power rate and high safety performance |
| CN201616479U (en) * | 2009-11-16 | 2010-10-27 | 河南比得力高新能源科技有限公司 | Multi-electrode lug lithium ion battery |
| WO2019024873A1 (en) * | 2017-08-01 | 2019-02-07 | 格力电器（武汉）有限公司 | Soft pack lithium ion battery and manufacturing method therefor |
| CN207265150U (en) * | 2017-09-26 | 2018-04-20 | 东莞市聚和新能源有限公司 | A kind of high-multiplying power discharge polymer Li-ion battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112531296A (en) * | 2020-11-26 | 2021-03-19 | 惠州亿纬集能有限公司 | Tab and soft package battery |
| CN114597598A (en) * | 2022-02-22 | 2022-06-07 | 岚图汽车科技有限公司 | Power battery and vehicle |
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| Publication number | Publication date |
|---|---|
| CN111786010B (en) | 2024-03-08 |
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