CN110085920A - Multi pole ears coiled lithium ion battery pole piece and preparation method thereof - Google Patents
Multi pole ears coiled lithium ion battery pole piece and preparation method thereof Download PDFInfo
- Publication number
- CN110085920A CN110085920A CN201810079087.4A CN201810079087A CN110085920A CN 110085920 A CN110085920 A CN 110085920A CN 201810079087 A CN201810079087 A CN 201810079087A CN 110085920 A CN110085920 A CN 110085920A
- Authority
- CN
- China
- Prior art keywords
- tab
- pole piece
- lithium ion
- group
- ion 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.)
- Pending
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 230000005405 multipole Effects 0.000 title claims abstract description 18
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 17
- 210000005069 ears Anatomy 0.000 title claims abstract description 15
- 238000002360 preparation method Methods 0.000 title claims description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 13
- 239000012528 membrane Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- H01M10/058—Construction or manufacture
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The present invention provides a kind of multi pole ears coiled lithium ion battery pole pieces, including pole piece ontology and several tabs, which is characterized in that several tabs are divided into n group, and tab described in every group includes x tab, and the width from the 1st tab to x-th of tab is by L1L is successively increased according to the form of arithmetic progressionmax, and the distance between two neighboring tab is W, the difference of the width between the 2nd tab and the 1st tab is 2 π Δ t, wherein Δ t is the sum of positive plate, negative electrode tab and two layers of membrane thicknesses in winding process.The utility model has the advantages that the 1, present invention will be designed as between the adjacent tab of any two, cross cutting is primary with following by the present invention, eliminates and is die cut the raised step that intersection place is formed twice, reduces battery self discharge rate, improve the security reliability of battery；2, pole piece cross cutting total degree of the present invention reduces half than traditional approach, can significantly extend the cutting die service life, reduce the accumulated tolerance of pole piece length size, promotes cross cutting and winding precision.
Description
Technical field
The present invention relates to a kind of multi pole ears coiled lithium ion battery pole pieces and preparation method thereof, belong to lithium ion battery skill
Art field.
Background technique
Under the conditions of the prior art, lithium-ion electric core is divided according to internal process and structure feature, there is winding and lamination two
Kind mode.Laminated cell is formed in parallel by multilayer cathode small pieces and anode small pieces, and each electrode small pieces can all draw a pole
Ear, thus the internal resistance of cell is small, high rate performance is excellent, but production efficiency is lower, and four side of pole piece is punched by blade, is also easy to produce
Dust burr causes micro-short circuit.Battery core high production efficiency and easy to automate is wound, but cannot be as laminated cell
Every layer is drawn a tab, so that the high rate performance of battery is had a greatly reduced quality.In order to solve this problem, multipole has been invented in the industry
Ear formula winding process, as shown in Figure 1, multiple tabs 11, all tabs 11 can be cut out in 1 upper mold of pole piece ontology by hardware blade
Width be equal, the distance between adjacent tab 11 successively increases, and increases the area of passage between battery core and cover board, reduces electricity
Pond impedance promotes high rate performance.However this multi pole ears are die cut mode, need to be die cut twice between two adjacent tabs,
Two knives intersection place necessarily forms raised step, and the step is more sharp, has and punctures diaphragm and cause the very big of internal short-circuit of battery
Hidden danger.There is part company to increase the technique of positive plate top edge coat protective layer in industry, is pierced to prevent diaphragm by raised step
It is broken to form short circuit, battery cost is significantly increased.For this purpose, needing to develop a kind of novel Wind lithium ion core, simplify system
Technique is made, the security reliability of battery is improved, while reducing battery cost.
Summary of the invention
It is an object of that present invention to provide a kind of multi pole ears coiled lithium ion battery pole pieces, are die cut the pole piece of needs using company
The mode of continuous coating is coated with forming, and there are the areas Kong Bo on the outside of coated film area forms multiple poles by the cross cutting area Kong Bo on pole piece
Ear, only primary with cross cutting between adjacent tab, tab width successively increases 2 π Δ t, and wherein Δ t is positive plate in winding process, is born
The sum of pole piece and two layers of membrane thicknesses, switching switching cutting die or adjustment cross cutting distance by way of, guarantee each tab it
Between only limited several distances, to guarantee only to need tape transport primary between adjacent company tab, pole piece be die cut total degree than biography
System mode reduces half, can extend the cutting die service life, reduces the accumulated tolerance of pole piece length size, promotes cross cutting and winding precision；
In addition the raised step that is formed when conventional multipole ear mold cuts intersection twice is also eliminated, the raised step is avoided and punctures diaphragm and draw
The risk for playing internal short-circuit of battery, reduces battery self discharge rate, improves the security reliability of battery, thus can cancel anode
The technique of on piece edge-coating ceramic insulating layer, is greatly reduced battery cost.
The present invention is achieved by the following technical solutions:
In a first aspect, the present invention provides a kind of multi pole ears coiled lithium ion battery pole pieces, if including pole piece ontology and
Dry tab, wherein several tabs are divided into n group, and tab described in every group includes x tab, from the 1st tab to x-th
The width of tab is by L1L is successively increased according to the form of arithmetic progressionmax, and the distance between two neighboring tab is W,
The difference of width between -1 tab of x-th of tab and xth is 2 π Δ t, wherein Δ t is positive plate, negative electrode tab in winding process
The sum of with two layers of membrane thicknesses.
Preferably, in tab described in two adjacent groups, the distance between adjacent tab is successively increased, such as n-th group pole
The distance between two neighboring tab in ear is W1, the distance between two neighboring tab in (n+1)th group of tab is W2, W2> W1。
Preferably, the LmaxMeet following relational expression:
2Lmax≤ b-5mm, b are the long axis length for the oval battery core being wound by the electrodes of lithium-ion batteries, unit
For mm.
A kind of preparation method of multi pole ears coiled lithium ion battery pole piece as the aforementioned comprising following steps:
It is die cut in the area Kong Bo of pole piece with cutting die, the quantity for controlling cutting die is equal with the group number of tab, a secondary cutting die
Control the cross cutting of one group of tab, adjacent tab spacing of the adjacent tab spacing that latter pair cutting die is die cut than previous secondary cutting die cross cutting
Long 2 π m Δ t, wherein m is the tab number that preceding secondary cutting die is die cut out, and Δ t is positive plate in winding process, negative electrode tab and two layers every
The sum of film thickness.
A kind of preparation method of multi pole ears coiled lithium ion battery pole piece as the aforementioned comprising following steps:
It being die cut in the area Kong Bo of pole piece with laser, the quantity for controlling the light path of laser is equal with the group number of tab, after
The adjacent tab spacing of the cross cutting of one group of tab is 2 π m Δ t longer than the adjacent tab spacing of previous secondary cutting die cross cutting.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, the present invention will be designed as cross cutting once between the adjacent tab of any two, eliminate the place shape of cross cutting intersection twice
At raised step, reduce battery self discharge rate, improve the security reliability of battery；
2, pole piece cross cutting total degree of the present invention reduces half than traditional approach, can significantly extend the cutting die service life, reduce pole piece
The accumulated tolerance of length dimension promotes cross cutting and winding precision；
3, pole piece of the present invention can be both die cut using existing cutting die mode, can also use laser die cutting mode mould
It cuts, there is very strong flexibility；
4, the present invention can cancel the technique of existing multi pole ears cross cutting winding battery core positive plate top edge coating ceramic insulating layer,
To which battery cost be greatly reduced.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is using the pole piece structure schematic diagram after prior art cross cutting forming；
Fig. 2 is the tab after using the method for the present invention cross cutting forming for the structural schematic diagram of one group of pole piece；
Fig. 3 is the tab after using the method for the present invention cross cutting forming for the structural schematic diagram of two groups of pole piece；
Fig. 4 is the tab after using the method for the present invention cross cutting forming for the structural schematic diagram of three groups of pole piece；
In figure: 1, pole piece ontology；11, tab.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
Embodiment 1
As shown in Fig. 2, the present embodiment uses one cutting die, 5 tabs 11, adjacent tab are cut out in 1 upper mold of pole piece ontology
11 width successively increases 1.7mm, and the spacing between two neighboring tab 11 is 67.73mm.
Embodiment 2
As shown in figure 3, the present embodiment uses 2 cutting die, 10 tabs 11 are cut out in 1 upper mold of pole piece ontology, wherein from a left side
It is first group to right 1st~5 tab 11, is die cut using first cutting die, the width of adjacent tab 11 successively increases 1.7mm,
The distance between adjacent tab 11 is 67.73mm；6th~10 tab 11 is second group, and the width of adjacent tab 11 is successively
Increase 1.7mm, the distance between adjacent tab is 76.26mm, and the 5th and the 6th tab spacing can be first cutting die
Length, or second cutting die length.
Embodiment 3
As shown in figure 4, the present embodiment uses 3 cutting die, it is die cut out 15 tabs, wherein from left to right the 1st~5 pole
Ear 11 is first group, is die cut using first cutting die, and the width of adjacent tab 11 successively increases 1.7mm, between adjacent tab 11
Distance be 67.73mm；6th~10 tab 11 is second group, is die cut using second cutting die, the width of adjacent tab 11
1.7mm is successively increased, the distance between adjacent tab is 76.26mm, and the 5th and the 6th tab spacing can be the first
Cutting die length, or second cutting die length；11st~15 tab 11 is third group, and cutting die is die cut using third,
The width of adjacent tab 11 successively increases 1.7mm, and the distance between adjacent tab is 84.80mm, the 10th and the 11st pole
Ear spacing can be second cutting die length, or third is cutting die length.
Since present invention employs, only with primary method is die cut, only need between adjacent company tab between adjacent tab
Tape transport is primary, and pole piece is die cut total degree and reduces half than traditional approach, can extend the cutting die service life, reduces the tired of pole piece length size
Tolerance is counted, cross cutting and winding precision are promoted；In addition it also eliminates conventional multipole ear mold and cuts the raised step formed when the intersection of two knives,
It avoids the raised step and punctures the risk that diaphragm causes internal short-circuit of battery, reduce battery self discharge rate, improve battery
Security reliability, battery cost is greatly reduced in the technique that thus can cancel positive plate top edge coat protective layer.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom", "inner", "outside" is orientation based on the figure or position
Relationship is set, is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning
It must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (5)
1. a kind of multi pole ears coiled lithium ion battery pole piece, including pole piece ontology and several tabs, which is characterized in that Ruo Gansuo
It states tab and is divided into n group, tab described in every group includes x tab, and the width from the 1st tab to x-th of tab is by L1According to etc.
The form of difference series successively increases Lmax, and the distance between two neighboring tab is W, x-th of tab and -1 pole of xth
The difference of the width of ear is 2 π Δ t, wherein Δ t is the sum of positive plate, negative electrode tab and two layers of membrane thicknesses in winding process.
2. multi pole ears coiled lithium ion battery pole piece as described in claim 1, which is characterized in that tab described in two adjacent groups
In, the distance between adjacent tab successively increases.
3. multi pole ears coiled lithium ion battery pole piece as described in claim 1, which is characterized in that the LmaxMeet as follows
Relational expression:
2Lmax≤ b-5mm, b are the long axis length for the oval battery core being wound by the electrodes of lithium-ion batteries, unit mm.
4. a kind of preparation method of multi pole ears coiled lithium ion battery pole piece as claimed in claim 1 or 2, feature exist
In including the following steps:
It is die cut in the area Kong Bo of pole piece with cutting die, the quantity for controlling cutting die is equal with the group number of tab, a secondary cutting die control
The adjacent tab spacing of the cross cutting of one group of tab, latter pair cutting die cross cutting is 2 π longer than the adjacent tab spacing of previous secondary cutting die cross cutting
M Δ t, wherein m is the tab number that preceding secondary cutting die is die cut out, and Δ t is positive plate in winding process, and negative electrode tab and two layers of diaphragm are thick
The sum of degree.
5. a kind of preparation method of multi pole ears coiled lithium ion battery pole piece as claimed in claim 1 or 2, feature exist
In including the following steps:
It being die cut in the area Kong Bo of pole piece with laser, the quantity for controlling the cutting die stroke of laser is equal with the group number of tab, after
The adjacent tab spacing of the cross cutting of one group of tab is 2 π m Δ t longer than the adjacent tab spacing of the cross cutting of previous group tab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810079087.4A CN110085920A (en) | 2018-01-26 | 2018-01-26 | Multi pole ears coiled lithium ion battery pole piece and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810079087.4A CN110085920A (en) | 2018-01-26 | 2018-01-26 | Multi pole ears coiled lithium ion battery pole piece and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110085920A true CN110085920A (en) | 2019-08-02 |
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ID=67412627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810079087.4A Pending CN110085920A (en) | 2018-01-26 | 2018-01-26 | Multi pole ears coiled lithium ion battery pole piece and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110085920A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474091A (en) * | 2019-09-09 | 2019-11-19 | 瑞浦能源有限公司 | A kind of method, power battery core and preparation method adjusting tab degree of registration |
| CN114156545A (en) * | 2021-10-22 | 2022-03-08 | 天津空间电源科技有限公司 | Stepped integrally-formed tab winding type lithium ion battery and preparation method thereof |
| CN117476868A (en) * | 2023-12-27 | 2024-01-30 | 瑞浦兰钧能源股份有限公司 | Pole piece of winding type battery, die cutting method of pole piece, battery core and battery |
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| CN102544437A (en) * | 2012-02-16 | 2012-07-04 | 浙江兴海能源科技有限公司 | Differential pitch pole piece and power battery adopting same |
| CN102569721A (en) * | 2012-02-16 | 2012-07-11 | 浙江兴海能源科技有限公司 | Difference pitch pole pieces and power battery adopting difference pitch pole pieces |
| CN106058137A (en) * | 2016-08-03 | 2016-10-26 | 上海航天电源技术有限责任公司 | Wound tab of lithium ion battery and manufacturing method of tab |
| JP2017069207A (en) * | 2015-09-30 | 2017-04-06 | 積水化学工業株式会社 | Lithium ion secondary battery and manufacturing method for the same |
-
2018
- 2018-01-26 CN CN201810079087.4A patent/CN110085920A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102544437A (en) * | 2012-02-16 | 2012-07-04 | 浙江兴海能源科技有限公司 | Differential pitch pole piece and power battery adopting same |
| CN102569721A (en) * | 2012-02-16 | 2012-07-11 | 浙江兴海能源科技有限公司 | Difference pitch pole pieces and power battery adopting difference pitch pole pieces |
| JP2017069207A (en) * | 2015-09-30 | 2017-04-06 | 積水化学工業株式会社 | Lithium ion secondary battery and manufacturing method for the same |
| CN106058137A (en) * | 2016-08-03 | 2016-10-26 | 上海航天电源技术有限责任公司 | Wound tab of lithium ion battery and manufacturing method of tab |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474091A (en) * | 2019-09-09 | 2019-11-19 | 瑞浦能源有限公司 | A kind of method, power battery core and preparation method adjusting tab degree of registration |
| CN110474091B (en) * | 2019-09-09 | 2021-06-22 | 瑞浦能源有限公司 | Method for adjusting alignment degree of tabs, power battery winding core and preparation method |
| CN114156545A (en) * | 2021-10-22 | 2022-03-08 | 天津空间电源科技有限公司 | Stepped integrally-formed tab winding type lithium ion battery and preparation method thereof |
| CN117476868A (en) * | 2023-12-27 | 2024-01-30 | 瑞浦兰钧能源股份有限公司 | Pole piece of winding type battery, die cutting method of pole piece, battery core and battery |
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Application publication date: 20190802 |