CN112467072A - Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery - Google Patents
Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery Download PDFInfo
- Publication number
- CN112467072A CN112467072A CN202011306560.1A CN202011306560A CN112467072A CN 112467072 A CN112467072 A CN 112467072A CN 202011306560 A CN202011306560 A CN 202011306560A CN 112467072 A CN112467072 A CN 112467072A
- Authority
- CN
- China
- Prior art keywords
- pole piece
- positive pole
- lithium ion
- ion battery
- head
- 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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Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 20
- 229920000642 polymer Polymers 0.000 title claims abstract description 14
- 238000004804 winding Methods 0.000 title abstract description 12
- 239000011888 foil Substances 0.000 claims abstract description 9
- 239000002390 adhesive tape Substances 0.000 claims abstract 2
- 239000007774 positive electrode material Substances 0.000 claims description 6
- 238000012946 outsourcing Methods 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 5
- 230000007847 structural defect Effects 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 10
- 229910052744 lithium Inorganic materials 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 210000001787 dendrite Anatomy 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a novel pole piece structure of a tab-wrapped winding type small polymer lithium ion battery, which comprises a positive pole piece and a negative pole piece, wherein the outer side surface of the head of the inner side of the positive pole piece, which is rolled twice, is set as a single-sided positive pole material, 2-3 mm of empty foil is reserved at the foremost end of the head of the positive pole piece, an insulating adhesive tape with the thickness of 10 micrometers to 20 micrometers is pasted at the joint of a positive pole material area and the foil, the positive pole is inserted firstly during winding, the winding is folded, then the negative pole piece is placed, and the positive pole piece and the negative pole piece are arranged on. The invention structurally avoids the structural defects of the traditional lithium ion battery pole piece roll core structure, and ensures the safety, and simultaneously, the electric core keeps higher capacity by optimizing the head structure of the positive pole piece.
Description
Technical Field
The invention relates to a lithium ion battery, in particular to a novel pole piece structure of a small polymer lithium ion battery with a winding type tab wrapped outside.
Background
The battery core of the small polymer lithium ion battery with the winding type tabs externally wrapped mainly comprises positive and negative pole pieces, a diaphragm, electrolyte, an aluminum plastic film and the tabs. In terms of structural design, there are two main structures at present: structure a and structure B as shown in fig. 1 and fig. 3. The advantages of structure a: the energy density is higher, more active substances can be filled in the same volume, and the capacity is higher. Disadvantages of Structure A: the lithium battery has the advantages that certain safety performance is sacrificed, in the battery cyclic charging and discharging process, metal lithium can be separated out from the position, corresponding to the diaphragm, of the copper foil at the head of the negative electrode, lithium dendrites are formed after the metal lithium is deposited to a certain degree to pierce the diaphragm, and the battery is caused to have safety accidents such as bulging and even fire. The advantages of structure B: the defect of the structure A is overcome in design, and the safety performance is guaranteed. Disadvantages of structure B: the negative electrode is wasted, the energy density is reduced more, the active material is filled into the same volume less, and the capacity is lower. According to the situation, a novel pole piece structure of a pole lug wrapping type small polymer lithium ion battery is needed to be researched.
Disclosure of Invention
The invention aims to solve the problems and provides a novel pole piece structure of a small polymer lithium ion battery with a winding type tab wrapped outside.
The technical scheme adopted by the invention is as follows: the utility model provides a novel utmost point ear outsourcing coiling formula small-size polymer lithium ion battery pole piece structure, includes positive plate and negative pole piece, anodal inboard leader roll up the lateral surface of two books establish to single face anodal material, the empty paper tinsel of 2~3mm is reserved to anodal pole piece head foremost, the insulating sticky tape of 10 microns to 20 mu m thickness is pasted with the paper tinsel handing-over department in anodal material district, inserts the positive pole earlier during the coiling, rolls up one book, puts into the negative pole piece again, positive plate and negative pole piece establish in same one side.
The invention has the beneficial effects that: structurally, the structural defect of a traditional lithium ion battery pole piece roll core structure is avoided, and the electric core keeps higher capacity by optimizing the head structure of the positive pole piece while the safety is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a cross section of a pole piece of a wrapping type small polymer lithium ion battery in the prior art.
Fig. 2 is an enlarged schematic view of a point a in fig. 1.
Fig. 3 is a schematic structural diagram of a cross section of a second wrapping type small polymer lithium ion battery pole piece of the conventional battery.
FIG. 4 is a schematic structural diagram of a cross section of a battery electrode plate according to the present invention.
Fig. 5 is an enlarged schematic view of B in fig. 4.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 3, a conventional tab-wrapped winding type small polymer lithium ion battery cell mainly comprises positive and negative electrode plates, a diaphragm, an electrolyte, an aluminum plastic film and a tab. In terms of structural design, there are two main structures in the traditional method: structure a is shown in fig. 1 and 2, structure B is shown in fig. 3, and structure a has the following advantages: the energy density is higher, more active substances can be filled in the same volume, and the capacity is higher. Disadvantages of Structure A: the lithium battery has the advantages that certain safety performance is sacrificed, in the battery cyclic charging and discharging process, metal lithium can be separated out from the position, corresponding to the diaphragm, of the copper foil at the head part of the negative electrode 1, and lithium dendrites are formed after the metal lithium is deposited to a certain degree to pierce the diaphragm, so that the battery is subjected to safety accidents such as bulging, even fire and the like. Fig. 2 is an enlarged view of a in fig. 1, and an arrow in fig. 2 indicates a direction in which lithium ions move, and when lithium ions reach a position of the negative electrode head 1, the position is not a negative electrode active material but a copper foil, and lithium intercalation cannot be normally completed, and lithium deposition occurs on the position and a separator.
As shown in fig. 3, a second structural schematic diagram of a cross section of a conventional external wrapping type small polymer lithium ion battery pole piece is shown, and the structure B has the following advantages: the defect of the structure A is overcome in design, and the safety performance is guaranteed. Disadvantages of structure B: the negative electrode is wasted, the energy density is reduced more, the active material is filled into the same volume less, and the capacity is lower. As shown in the dotted line housing of fig. 3, the single fabric on the inner side of the double-folded negative electrode does not participate in the chemical reaction, and the filling amount of the positive electrode active material in the same volume is reduced.
Fig. 4 and 5 are schematic structural views of a cross section of a battery pole piece according to the present invention. The invention integrates the advantages of the two structures and provides a novel pole piece structure of a pole lug wrapping winding type small polymer lithium ion battery. Referring to fig. 5, the head of the positive electrode sheet is changed into a double-folded single fabric, a single fabric, that is, the inner side surface of the aluminum foil of the positive electrode sheet is not coated with the positive electrode material, as shown in fig. 5, in the positive electrode sheet 2, the lower surface of the aluminum foil is not coated with the positive electrode material, the lower aluminum foil is exposed, that is, the upper, lower, left and right inner side surfaces of the first fold are not coated with the positive electrode material, and the range of the single fabric is shown by the dotted-dashed. And 2-3 mm of empty foil is reserved at the foremost end 21 of the head of the positive pole piece, and a 16-micron green adhesive 5 is required to be adhered to the joint of the positive pole material area and the foil, namely two adhesive positions are adhered as shown in figure 5. When winding, the positive plate 2 is inserted first, and the negative plate 3 is placed after winding and folding. The positive plate and the negative plate are arranged on the same side, as shown in fig. 5, the inner side end of the positive plate and the inner side end of the negative plate are both arranged on the left side above the inner side, wherein the positive plate end 22 is arranged below the positive plate, the negative plate end 31 is arranged above the positive plate end, and the diaphragm 4 is arranged in the middle of the positive plate and the negative plate. The structure avoids structural defects of a traditional lithium ion battery pole piece roll core structure, and the capacity is kept high by optimizing the head structure of the positive pole piece while the safety is ensured.
Claims (1)
1. The utility model provides a novel pole piece structure of pole lug outsourcing coiling formula small-size polymer lithium ion battery, includes positive plate and negative pole piece, its characterized in that: the outer side surface of the sheet head at the inner side of the positive electrode is rolled for two times and is set as a single-sided positive electrode material, 2-3 mm of empty foil is reserved at the foremost end of the head of the positive electrode sheet, an insulating adhesive tape with the thickness of 10 micrometers to 20 micrometers is attached to the joint of the positive electrode material area and the foil, the positive electrode is inserted and rolled for one time during rolling, then the negative electrode sheet is placed, and the positive electrode sheet and the negative electrode sheet are arranged on the same side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306560.1A CN112467072A (en) | 2020-11-20 | 2020-11-20 | Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011306560.1A CN112467072A (en) | 2020-11-20 | 2020-11-20 | Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112467072A true CN112467072A (en) | 2021-03-09 |
Family
ID=74836791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011306560.1A Pending CN112467072A (en) | 2020-11-20 | 2020-11-20 | Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112467072A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116581396A (en) * | 2023-07-10 | 2023-08-11 | 宁德新能源科技有限公司 | Battery core and electric equipment |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202363549U (en) * | 2011-12-15 | 2012-08-01 | 协鑫动力新材料（盐城）有限公司 | Winding-type lithium ion battery structure |
| JP2016051538A (en) * | 2014-08-29 | 2016-04-11 | 日立オートモティブシステムズ株式会社 | Square secondary battery |
| CN206595352U (en) * | 2016-12-31 | 2017-10-27 | 中山天贸电池有限公司 | A kind of novel coiling formula polymer lithium ion battery electric core |
| CN208352451U (en) * | 2018-04-27 | 2019-01-08 | 浙江天能能源科技股份有限公司 | A kind of lithium ion battery |
| CN214123912U (en) * | 2020-11-20 | 2021-09-03 | 汕尾天贸新能源科技有限公司 | Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery |
-
2020
- 2020-11-20 CN CN202011306560.1A patent/CN112467072A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202363549U (en) * | 2011-12-15 | 2012-08-01 | 协鑫动力新材料（盐城）有限公司 | Winding-type lithium ion battery structure |
| JP2016051538A (en) * | 2014-08-29 | 2016-04-11 | 日立オートモティブシステムズ株式会社 | Square secondary battery |
| CN206595352U (en) * | 2016-12-31 | 2017-10-27 | 中山天贸电池有限公司 | A kind of novel coiling formula polymer lithium ion battery electric core |
| CN208352451U (en) * | 2018-04-27 | 2019-01-08 | 浙江天能能源科技股份有限公司 | A kind of lithium ion battery |
| CN214123912U (en) * | 2020-11-20 | 2021-09-03 | 汕尾天贸新能源科技有限公司 | Novel pole piece structure of pole lug wrapped winding type small polymer lithium ion battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116581396A (en) * | 2023-07-10 | 2023-08-11 | 宁德新能源科技有限公司 | Battery core and electric equipment |
| CN116581396B (en) * | 2023-07-10 | 2024-04-05 | 宁德新能源科技有限公司 | Battery core and electric equipment |
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