CN102169983B - Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery - Google Patents
Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery Download PDFInfo
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- CN102169983B CN102169983B CN201010115932.2A CN201010115932A CN102169983B CN 102169983 B CN102169983 B CN 102169983B CN 201010115932 A CN201010115932 A CN 201010115932A CN 102169983 B CN102169983 B CN 102169983B
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- pole piece
- compacted density
- graphite cathode
- cathode pole
- ion battery
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 59
- 239000010439 graphite Substances 0.000 title claims abstract description 59
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 238000003825 pressing Methods 0.000 title abstract 5
- 238000000034 method Methods 0.000 claims abstract description 33
- 238000013461 design Methods 0.000 claims description 10
- 239000007770 graphite material Substances 0.000 abstract description 2
- 238000005056 compaction Methods 0.000 abstract 5
- 230000000052 comparative effect Effects 0.000 description 16
- 238000012360 testing method Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 6
- 239000011258 core-shell material Substances 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 238000009490 roller compaction Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- -1 graphite, natural modified graphite Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a manufacturing of a lithium-ion battery and a pressing method of a graphite negative electrode piece of the lithium-ion battery. The pressing method comprises the following steps of: carrying out compaction operation on the graphite negative electrode piece according to first compaction density during piece pressing; and carrying out the compaction operation on the graphite negative electrode piece according to second compaction density after a given time interval. In the invention, the compaction density of a negative electrode graphite material is effectively improved by carrying out piece-pressing processes on a graphite negative electrode twice, so that the density of negative electrode capacity is improved, and the aim of improving battery capacity is fulfilled.
Description
Technical field
The present invention relates to battery manufacturing field, specifically relate to a kind of manufacture method of lithium ion battery and the tabletting method of graphite cathode pole piece thereof.
Background technology
The high-capacity lithium ion cell of good combination property more and more becomes the theme of Battery Market demand, and the overall performance of the processing characteristics of cell negative electrode material on battery core also exists important impact, especially the focus technically paid close attention to especially of the negative material of high-pressure solid.In negative material used in current lithium ion battery manufacturing, negative electrode active material main still native graphite, natural modified graphite and Delanium.Contact closely for making negative electrode active material with net grid or flow collection sheet, reduce the thickness of pole piece, increase loadings, in cell fabrication processes, after cathode size coating, oven dry, section, need anticathode pole piece to carry out compressing tablet, to improve the utilance of battery unit volume, thus improve the capacity of battery.And the defect that graphite cathode material exists is, the physics bounce-back of itself is larger, pole piece after compression in very short a period of time thickness will to quick rebound rise, to such an extent as to compacted density do not reach material license itself can percent consolidation, if be at this moment directly depressed into larger compacted density with stronger pressure, just there will be the phenomenon such as light, fold, make material lose the premium properties of itself, graphite granule also likely crushes by serious words.
Summary of the invention
The technical problem to be solved in the present invention technology proposes a kind of tabletting method of graphite cathode pole piece of lithium ion battery, and adopt this tabletting method to make the method for lithium ion battery, to improve the actual compacted density of graphite negative electrode of lithium ion battery, thus make full use of limited battery space, promote battery capacity.
The technical solution used in the present invention is:
The feature of the tabletting method of the graphite cathode pole piece of this lithium ion battery is: carry out repeatedly compacting operation to graphite cathode pole piece, each compacting operation interval setting-up time, and each compacted density is no more than the maximum available compacted density of graphite cathode pole piece.
Preferably, the tabletting method of the graphite cathode pole piece of above-mentioned lithium ion battery, first carries out compacting operation by the first compacted density to graphite cathode pole piece, after the setting-up time of interval, then carries out compacting operation by the second compacted density to graphite cathode pole piece.
Described second compacted density is the design compacted density of graphite cathode pole piece.
Described first compacted density is the design compacted density of graphite cathode pole piece.
Described setting-up time is 15 ~ 45min.
The manufacture method of this lithium ion battery comprises the tableting step of graphite cathode pole piece, and in the tableting step of described graphite cathode pole piece, repeatedly compacting operation is carried out to graphite cathode pole piece, each compacting operation interval setting-up time, and each compacted density is no more than the maximum available compacted density of graphite cathode.
Preferably, the tableting step of described graphite cathode pole piece is specially: first carry out compacting operation by the first compacted density to graphite cathode pole piece, after the setting-up time of interval, then carries out compacting operation by the second compacted density to graphite cathode pole piece.
The present invention is compared with the prior art had beneficial effect: by a conventional sheeting operation basis on, secondary tablet forming technique is carried out to graphite cathode, buffering is given in the bounce-back of anticathode graphite material, final actual compacted density effectively improves, make actual compacted density as far as possible close to available maximum compacted density, thus improve capacity of negative plates density, the object promoting battery capacity is issued in the situation of inside battery space invariance.
Embodiment
Embodiment one
Adopt pure natural graphite to be that negative active core-shell material makes graphite cathode pole piece, its maximum available compacted density is 1.62g/cm
3, adopt this graphite cathode pole piece to make the battery of 423450 types.
Comparative example: the design compacted density of negative pole is 1.58g/cm
3, adopting a conventional tabletting method, is 1.58g/cm by compacted density
3carry out compacting operation to graphite cathode pole piece, after compressing tablet, negative pole rebounds at short notice, tests final actual compacted density and reduces to 1.53 ~ 1.55g/cm
3.Make the battery core of 100 comparative examples, guarantee that negative pole amount reaches capacity state, battery core key property is all normal.The average size that test records 0.2C electric discharge is 941.88mAh.
Embodiment: adopt secondary compressing tablet to make, cathode pole piece is pressed 1.58g/cm by first time
3the first compacted density carry out compacting, wait for the setting-up time that 15 ~ 45min does not wait, after pole piece bounce-back, then press 1.58g/cm
3the second compacted density once repeat roller compaction processes, testing final actual compacted density is 1.57 ~ 1.58g/cm
3, more negative pole amount can be increased than comparative example in identical space.Make 100 batteries according to secondary sheeting process, guarantee that negative pole amount reaches capacity state, battery core key property is normal.The average size that test records 0.2C electric discharge is 978.80mAh, higher than the battery capacity of comparative example.
Embodiment two
Adopt natural coated graphite to be that negative active core-shell material makes graphite cathode pole piece, its maximum available compacted density is 1.60g/cm
3, adopt this graphite cathode pole piece to make 423048 type batteries.
Comparative example: the design compacted density of negative pole is 1.56g/cm
3, adopting a conventional tabletting method, is 1.56g/cm by compacted density
3carry out compacting operation to graphite cathode pole piece, after compressing tablet, negative pole rebounds at short notice, tests final actual compacted density and reduces to 1.49 ~ 1.51g/cm
3.Make the battery core of 100 comparative examples, guarantee that negative pole amount reaches capacity state, battery core key property is all normal.Test record 0.2C electric discharge average size be 743.22mAh, 1C electric discharge average size be 721.53mAh.
Embodiment: adopt secondary compressing tablet to make, cathode pole piece is pressed 1.56g/cm by first time
3the first compacted density carry out compacting operation, wait for the setting-up time of 30min, after pole piece bounce-back, then press 1.56g/cm
3the second compacted density once repeat roller compaction processes, testing final actual compacted density is 1.54 ~ 1.56g/cm
3, more negative material amount can be increased than comparative example in identical space.Make 100 batteries according to secondary sheeting process, guarantee that negative pole amount reaches capacity state, battery core key property is normal.Test record 0.2C electric discharge average size be 765.66mAh, 1C electric discharge average size be 743.61mAh, higher than the battery capacity of comparative example.
Embodiment three
Adopt high-performance Delanium to be that negative active core-shell material makes graphite cathode pole piece, its maximum available compacted density is 1.65g/cm
3, adopt this graphite cathode pole piece to make 433446 type batteries.
Comparative example: the design compacted density of negative pole is 1.61g/cm
3, adopting a conventional tabletting method, is 1.61g/cm by compacted density
3carry out compacting operation to graphite cathode pole piece, after compressing tablet, negative pole rebounds at short notice, tests final actual compacted density and reduces to 1.56 ~ 1.58g/cm
3.Make the battery core of 100 comparative examples, guarantee that negative pole amount reaches capacity state, battery core key property is all normal.The average size that test records 0.2C electric discharge is 816.87mAh.
Embodiment: adopt secondary compressing tablet to make, cathode pole piece is pressed 1.58g/cm by first time
3the first compacted density carry out compacting operation, wait for the setting-up time of 30min, after pole piece bounce-back, then press 1.63g/cm
3the second compacted density once repeat roller compaction processes, testing final actual compacted density is 1.59 ~ 1.62g/cm
3, more negative electrode active material content can be increased than comparative example in identical space.Make 100 batteries according to secondary sheeting process, guarantee that negative pole amount reaches capacity state, battery core key property is all normal.The average size that test records 0.2C electric discharge is 834.36mAh, higher than the battery capacity of comparative example.
Embodiment four
Adopt high-performance Delanium to be that negative active core-shell material makes graphite cathode pole piece, its maximum available compacted density is 1.65g/cm
3, adopt this graphite cathode pole piece to make 053450 type battery.
Comparative example: the design compacted density of negative pole is 1.60g/cm
3, adopting a conventional tabletting method, is 1.60g/cm by compacted density
3carry out compacting operation to graphite cathode pole piece, after compressing tablet, negative pole rebounds at short notice, tests final actual compacted density and reduces to 1.54 ~ 1.58g/cm
3.Make the battery core of 100 comparative examples, guarantee that negative pole amount reaches capacity state, battery core key property is all normal.The average size that test records 0.2C electric discharge is 1044.50mAh.
Embodiment: adopt secondary compressing tablet to make, cathode pole piece is pressed 1.45g/cm by first time
3the first compacted density carry out compacting operation, wait for the setting-up time of 30min, after pole piece bounce-back, then press 1.61g/cm
3the second compacted density once repeat roller compaction processes, testing final actual compacted density is 1.59 ~ 1.60g/cm
3, more negative material amount can be increased than comparative example in identical space.Make 100 batteries according to secondary sheeting process, guarantee that negative pole amount reaches capacity state, battery core key property is all normal.The average size that test records 0.2C electric discharge is 1073.15mAh, higher than the battery capacity of comparative example.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (8)
1. the tabletting method of the graphite cathode pole piece of a lithium ion battery, it is characterized in that: repeatedly compacting operation is carried out to graphite cathode pole piece, each compacting operation interval setting-up time, and each compacted density is no more than the maximum available compacted density of graphite cathode pole piece;
Described setting-up time is 15-45min.
2. the tabletting method of the graphite cathode pole piece of lithium ion battery as claimed in claim 1, it is characterized in that: first by the first compacted density, compacting operation is carried out to graphite cathode pole piece, after the setting-up time of interval, then by the second compacted density, compacting operation is carried out to graphite cathode pole piece.
3. the tabletting method of the graphite cathode pole piece of lithium ion battery as claimed in claim 2, is characterized in that: described second compacted density is the design compacted density of graphite cathode pole piece.
4. the tabletting method of the graphite cathode pole piece of lithium ion battery as claimed in claim 3, is characterized in that: described first compacted density is the design compacted density of graphite cathode pole piece.
5. the manufacture method of a lithium ion battery, comprise the tableting step of graphite cathode pole piece, it is characterized in that: in the tableting step of described graphite cathode pole piece, repeatedly compacting operation is carried out to graphite cathode pole piece, each compacting operation interval setting-up time, and each compacted density is no more than the maximum available compacted density of graphite cathode;
Described setting-up time is 15-45min.
6. the manufacture method of lithium ion battery as claimed in claim 5, it is characterized in that, the tableting step of described graphite cathode pole piece is specially: first carry out compacting operation by the first compacted density to graphite cathode pole piece, after the setting-up time of interval, then by the second compacted density, compacting operation is carried out to graphite cathode pole piece.
7. the manufacture method of lithium ion battery as claimed in claim 6, is characterized in that: described second compacted density is the design compacted density of graphite cathode pole piece.
8. the manufacture method of lithium ion battery as claimed in claim 7, is characterized in that: described first compacted density is the design compacted density of graphite cathode pole piece.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010115932.2A CN102169983B (en) | 2010-02-25 | 2010-02-25 | Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery |
| HK12101955.7A HK1161426A1 (en) | 2010-02-25 | 2012-02-27 | The producing method of the li-ion battery and the sheet pressing method of the graphite negative pole electrode sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010115932.2A CN102169983B (en) | 2010-02-25 | 2010-02-25 | Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102169983A CN102169983A (en) | 2011-08-31 |
| CN102169983B true CN102169983B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010115932.2A Active CN102169983B (en) | 2010-02-25 | 2010-02-25 | Manufacturing method of lithium-ion battery and pressing method of graphite negative electrode piece of lithium-ion battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102169983B (en) |
| HK (1) | HK1161426A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113363422B (en) * | 2021-03-31 | 2022-09-30 | 万向一二三股份公司 | Preparation method of low-negative-electrode-expansion long-cycle lithium ion battery and lithium ion battery |
| CN113421992A (en) * | 2021-06-25 | 2021-09-21 | 湖北亿纬动力有限公司 | Negative plate, preparation method thereof and lithium ion battery |
| CN114420885A (en) * | 2022-01-25 | 2022-04-29 | 上海兰钧新能源科技有限公司 | Pole piece manufacturing method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1496588A (en) * | 2001-03-06 | 2004-05-12 | ������ѧ��ʽ���� | Graphite material for negative pole of lithium secondary battery, method of manufacturing graphite material, and lithium secondary battery |
| CN1655290A (en) * | 2005-02-24 | 2005-08-17 | 深圳市固派电子有限公司 | Macromolecular positive temperature coefficient thermosensitive resistor and method for making same |
| CN1805183A (en) * | 2006-01-20 | 2006-07-19 | 深圳市豪鹏科技有限公司 | Manufacturing method of negative electrode plate of Ni-H cell |
| JP2007324074A (en) * | 2006-06-05 | 2007-12-13 | Matsushita Electric Ind Co Ltd | Electrode plate for nonaqueous secondary battery, its manufacturing method, and nonaqueous secondary battery using this |
-
2010
- 2010-02-25 CN CN201010115932.2A patent/CN102169983B/en active Active
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2012
- 2012-02-27 HK HK12101955.7A patent/HK1161426A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1496588A (en) * | 2001-03-06 | 2004-05-12 | ������ѧ��ʽ���� | Graphite material for negative pole of lithium secondary battery, method of manufacturing graphite material, and lithium secondary battery |
| CN1655290A (en) * | 2005-02-24 | 2005-08-17 | 深圳市固派电子有限公司 | Macromolecular positive temperature coefficient thermosensitive resistor and method for making same |
| CN1805183A (en) * | 2006-01-20 | 2006-07-19 | 深圳市豪鹏科技有限公司 | Manufacturing method of negative electrode plate of Ni-H cell |
| JP2007324074A (en) * | 2006-06-05 | 2007-12-13 | Matsushita Electric Ind Co Ltd | Electrode plate for nonaqueous secondary battery, its manufacturing method, and nonaqueous secondary battery using this |
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| Publication number | Publication date |
|---|---|
| HK1161426A1 (en) | 2012-08-24 |
| CN102169983A (en) | 2011-08-31 |
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Effective date of registration: 20160822 Address after: Kwai Chung street Beek Industrial Park in Longgang District of Shenzhen City, Guangdong Province, No. 6 building 518000 Patentee after: SHENZHEN BAK POWER BATTERY Co.,Ltd. Address before: Kwai Chung street Beek Industrial Park in Longgang District of Shenzhen City, Guangdong province 518119 Patentee before: SHENZHEN BAK BATTERY Co.,Ltd. |
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