CN102064302B - Diaphragm, battery core and winding method thereof - Google Patents
Diaphragm, battery core and winding method thereof Download PDFInfo
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- CN102064302B CN102064302B CN2010106026242A CN201010602624A CN102064302B CN 102064302 B CN102064302 B CN 102064302B CN 2010106026242 A CN2010106026242 A CN 2010106026242A CN 201010602624 A CN201010602624 A CN 201010602624A CN 102064302 B CN102064302 B CN 102064302B
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- barrier film
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- diaphragm
- electric core
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 title claims abstract description 9
- 230000004888 barrier function Effects 0.000 claims description 77
- 239000012528 membrane Substances 0.000 claims description 40
- -1 polypropylene Polymers 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 11
- 229920001155 polypropylene Polymers 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 10
- 238000007731 hot pressing Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920002978 Vinylon Polymers 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000652 nickel hydride Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 238000006277 sulfonation reaction Methods 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 210000001724 microfibril Anatomy 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to a diaphragm, a battery core and a winding method thereof. The diaphragm has at least two different thicknesses along the unfolding direction; and when the diaphragm is used for winding a battery core, the thickness of the diaphragm wound in the inner circle is not smaller than that of the diaphragm wound in the outer circle. Compared with the prior art, the diaphragm provided by the invention has the advantage of being capable of reducing the frequency of short circuits or micro short circuits and accommodating more electrolyte so as to improve the capacity and the service life of the battery core under the premise that the requirement for sufficient mechanical strength is met.
Description
Technical field
The present invention relates to the method for winding of a kind of barrier film, electric core and electric core.
?
Background technology
Now, the barrier film of coiled battery electricity core places between positive pole and the negative pole, and it mainly acts on is to prevent that positive plate and negative plate active material from contacting, and then causes electric in-core short circuit.Barrier film occupies crucial status in electric core, directly influence short circuit, low-pressure performance, life-span and the self-discharge performance of electric core.
General requirement has good chemical stability and certain mechanical strength to the takeup type electric core membrane.But the thickness of barrier film and its mechanical strength and liquid-keeping property have contradiction property; High power capacity electricity core particularly; Because electrode slice produces certain micro-crack in winding process; Thereby certain dry linting takes place or produce certain burr phenomena, its barrier film is prone to reel that place that the back produces micro-crack is punctured or owing to dry linting forms short circuit or micro-short circuit at coiling front end or all generating electrodes sheets.
The Chinese patent of number of patent application 200410056887.2 " alkaline barrier film and preparation method thereof " has been introduced a kind of alkaline electric core membrane; Comprise that thickness is that main membrane layer and the thickness of 0.10-0.25mm is the above auxiliary membrane layer of 0.5mm, auxiliary membrane layer coats through heat pressure adhesive and is positioned in the middle of the main membrane layer.Because barrier film comprises two crude fibre layers and a microfibril layer, form density gradient from thickness direction, improved the mechanical strength of barrier film greatly.
Summary of the invention
Technical problem to be solved by this invention is that a kind of barrier film at first is provided, and under the prerequisite that satisfies enough mechanical strengths, can hold more electric liquid to improve the capacity of electric core.Under the prerequisite that satisfies enough mechanical strengths, can reduce short circuit or micro-short circuit and hold capacity and the life-span of more electrolyte to improve electric core.
Secondly, the method for winding of a kind of electric core and electric core also will be provided.
To this, the present invention at first provides a kind of barrier film, and said barrier film has at least two kinds of different thickness along its expansion direction; Said membrane coil twists in the thickness of the barrier film of inner ring when electric core, be not less than the thickness of the barrier film that twists in the outer ring.
Accordingly, the present invention also provides a kind of electric core, comprising: described barrier film, positive plate, and negative plate; Said barrier film is wound into electric core at a distance between positive plate and negative plate.And,
A kind of method for winding of electric core, described barrier film at a distance between positive plate and negative plate, is wound into electric core.
Because be wound on the barrier film of electric core center, its radius of curvature is less, suffered stress, then is easy to generate such as destructions such as micro-cracks if its mechanical strength is not high can be bigger, causes internal short-circuit.Adopt technique scheme, this membrane coil is around the barrier film of electric core center, and its thickness will be bigger, and corresponding mechanical strength also can be bigger, when receiving bigger stress, also can keep its machine performance preferably.
And the whole mechanical strength of simple increase barrier film; Like one Chinese patent application 200410056887.2 " alkaline barrier film and preparation method thereof "; But the integral thickness of this barrier film is big, will in electric core, occupy excessive volume; Thereby can't hold more electric liquid down, causing can't be in the use on the high power capacity model.
And adopt technical scheme of the present invention, and be wound on the barrier film of outer ring, because its thickness is less, can reserves more space and keep electric liquid, can under the prerequisite of the whole given volume of electric core, further improve the capacity of electric core like this.And this technical scheme can also have been saved the required material of barrier film.
And, near the pole piece the coiled battery electricity core center, its radius of curvature is less, and suffered stress is bigger, ruptures easily and produces burr, and then damage barrier film.And adopt technical scheme of the present invention; Increased near the radius of curvature of two pole pieces electric core center because pad is thick; Make two pole pieces and barrier film be not easy fracture; And reduced the probability of the generation dry linting of two pole pieces, thereby reduced the possibility of short circuit or micro-short circuit, the life-span of further having improved battery battery core; Simultaneously, barrier film is not easy to be damaged by two pole pieces.
Compared with prior art, the invention has the advantages that, under the prerequisite that satisfies enough mechanical strengths, can reduce short circuit or micro-short circuit and hold capacity and the life-span of more electrolyte to improve electric core.
Preferably, described barrier film comprises: at least two of splicing successively, have a diaphragm section of different-thickness respectively.
Adopt abovementioned technology, manufacturing that can be easier is to obtain corresponding barrier film.
Further, said diaphragm section is respectively successively splicing: thin membrane section, inferior thin membrane section, thick skirt section and inferior thin membrane section.
Further, said thin membrane section is along expansion direction, and its thickness is trapezoidal profile, is abutted against the thicker at thick skirt section place more.
Further, the thickness of said thick skirt section is not less than 0.15 millimeter, the thickness of said thin membrane section trapezoidal profile between 0.10 to 0.15, and the thickness of said thin membrane section is not more than 0.10 millimeter.
Preferably, adjacent said diaphragm section is welded through hot pressing.
Preferably, the material of said diaphragm section adopts: at least a in nylon fiber, polypropylene fibre, the polyethylene fiber peacekeeping vinylon fibre.
Description of drawings
Fig. 1 is the structural representation of a kind of specific embodiment of barrier film of the present invention before coiling;
Fig. 2 is the structural representation of a kind of specific embodiment of the present invention's electricity core;
Fig. 3 is the coiling cutaway view of a kind of specific embodiment of the present invention's electricity core.
Embodiment
Below in conjunction with accompanying drawing, more excellent embodiment of the present invention is done further detailed description:
As shown in Figure 1, the structural representation before a kind of barrier film 300 is reeled.Barrier film 300 comprises successively and to connect: thin membrane section 303, thin membrane section 302, thick skirt section 301, thin membrane section 302, thin membrane section 303 and thin membrane section 304 for the first time for the second time for the second time for the first time.Wherein, inferior thin membrane section comprises: have different-thickness, and interconnective first time thin membrane section 303 and thin membrane section 302 for the second time.
Wherein, the thickness of thick skirt section 301 more than the 0.15mm, the thickness of inferior thin membrane section between 0.10 to 0.15mm, the thickness of thin membrane section 304 is below 0.10mm.
The connected mode of diaphragm section can adopt hot pressing to connect.
Wherein, the material of barrier film 300 can adopt nylon fiber, polypropylene fibre, polyethylene fibre, vinylon fibre, through oversulfonate handle more than in the material of several kinds of materials one or more.
The hop count of diaphragm section can be decided according to the actual coiling number of turns of electric core, and hop count can be the coiling number of turns of electric core.
For example, in another kind of embodiment, also can directly make a kind of barrier film 300, the thickness of this barrier film 300 reduces from an end to the other end gradually.Barrier film 300 is placed between first electrode slice and second electrode slice, is that initiating terminal is reeled with the thickest end of barrier film 300, thereby is made into coiled battery electricity core.
In another kind of embodiment; The thickness of thick skirt section 301 is more than the 0.15mm; For the second time thin membrane section 302, thin membrane section 303 is all identical with the thickness of thin membrane section 304 for the first time; And less than 0.15mm, promptly only need the barrier film 300 of bonding two kinds of thickness to get final product, this kind mode can be referred to as three sections connected modes.
Three sections connected modes of this kind in the mechanical strength that guarantees barrier film 300 with when to a certain degree improving electric core capacity, have also reduced the technology that connects barrier film 300, have improved efficient.
According to the mode of Fig. 2, positive plate 100, barrier film 300 and negative plate 200 are wound into electric core.As shown in Figure 3, promptly the corresponding electric core of membrane coil coiled shown in Figure 1.
Symmetry axis with thick skirt section 301 is that symmetry axis is with barrier film 300 doublings; Then with in the barrier film 300 after first electrode slice placement doubling; Again second electrode slice is placed on barrier film 300 surfaces, and with first electrode slice overlapping after, be that initiating terminal is reeled with thick skirt section 301.Thereby along with the coiling direction of electric core, the thickness of diaphragm section reduces gradually.
The nickel hydride charging electricity core that to adopt making capacity of the present invention be AA2600mAh, battery battery core is designed to 3.5 circles.
In order to further specify, also further provide following specific embodiment and data to do following explanation:
Execution mode 1:
Execution mode 2
Execution mode 3
Following Comparative Examples is a prior art embodiments, and contrast is to explain the concrete advantage of the embodiment of the invention:
Comparative Examples 1
Adopting whole segmentation thickness is 0.10mm polypropylene sulfonated membrane.
Comparative Examples 2
Adopting whole segmentation thickness is 0.09mm polypropylene sulfonated membrane.
The barrier film of Comparative Examples is wrapped on the positive pole, again negative pole is placed on the barrier film, reel, be assembled into electric core, through changing into the nickel hydride charging electricity core that the capacity of obtaining is AA2600mAh.
At execution mode 1 to 3, and Comparative Examples 1 to 2 is processed 10,000 ten thousand electric cores respectively.
The manufacturing process coiling short circuit ratio of 10,000 ten thousand electric cores that execution mode 1 to 3 and Comparative Examples 1 to 2 are respectively processed and change into short circuit ratio and add up, as shown in the table:
Table 1
| The coiling short circuit ratio | Change into short circuit ratio | |
| Execution mode 1 | 0.11% | 0.09% |
| Execution mode 2 | 0.14% | 0.10% |
| Execution mode 3 | 0.16% | 0.11% |
| Comparative Examples 1 | 0.53% | 0.72% |
| Comparative Examples 2 | 0.72% | 0.81% |
Each 100 in the electric core that the extraction distinct methods is processed with 2600mA current charges 66mins, was preserved 28 days in 45 ℃ of environment.Simultaneously respectively extract 100,, preserved 1 year at normal temperature environment with 2600mA current charges 66mins.Short circuit electricity core quantity contrasts like following table:
| 45 ℃ 28 days | Normal temperature 1 year | |
| Execution mode 1 | 0 | 0 |
| Execution mode 2 | 1 | 0 |
| Execution mode 3 | 0 | 0 |
| Comparative Examples 1 | 5 | 4 |
| Comparative Examples 2 | 4 | 3 |
Charging repeatedly under following condition, the cycle-index when reaching initial capacity 60% with discharge capacity is as cycle life:
The 2600mA 66mins that charges ,-△ 5mV shelves 10mins, the 2600mA discharge, final voltage is 1.00V, adds up as shown in the table:
| Life-span | |
| Execution mode 1 | 380 |
| Execution mode 2 | 370 |
| Execution mode 3 | 370 |
| Comparative Examples 1 | 200 |
| Comparative Examples 2 | 250 |
Through evidence, adopt the multistage barrier film 300 of mode in succession, can reduce electric core self discharge, increase the service life, improve the long term storage performance.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that practical implementation of the present invention is confined to these explanations.For the those of ordinary skill of technical field under the present invention, under the prerequisite that does not break away from the present invention's design, can also make some simple deduction or replace, all should be regarded as belonging to protection scope of the present invention.
Claims (9)
1. a barrier film is characterized in that, said barrier film has multiple different thickness along its expansion direction; During said membrane coil coiled electricity core, the barrier film of said multiple different-thickness is outwards arranged to thin by thick from electric core center.
2. barrier film as claimed in claim 1 is characterized in that, comprising: a plurality of diaphragm section that have different-thickness respectively of splicing successively.
3. barrier film as claimed in claim 2 is characterized in that, said diaphragm section is respectively successively splicing: thin membrane section, inferior thin membrane section, thick skirt section and inferior thin membrane section.
4. barrier film as claimed in claim 3 is characterized in that, said thin membrane section is along expansion direction, and its thickness is trapezoidal profile, is abutted against the thicker at thick skirt section place more.
5. barrier film as claimed in claim 4 is characterized in that, the thickness of said thick skirt section is not less than 0.15 millimeter, the thickness of said thin membrane section trapezoidal profile between 0.10 to 0.15, and the thickness of said thin membrane section is not more than 0.10 millimeter.
6. barrier film as claimed in claim 2 is characterized in that, adjacent said diaphragm section is welded through hot pressing.
7. barrier film as claimed in claim 2 is characterized in that, the material of said diaphragm section adopts: at least a in nylon fiber, polypropylene fibre, the polyethylene fiber peacekeeping vinylon fibre.
8. an electric core is characterized in that, comprising: like arbitrary described barrier film in the claim 1 to 7, positive plate, and negative plate; Said barrier film is wound into electric core at a distance between positive plate and negative plate.
9. the method for winding of an electric core is characterized in that, adopts like arbitrary described barrier film in the claim 1 to 7, at a distance between positive plate and negative plate, is wound into electric core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106026242A CN102064302B (en) | 2010-12-23 | 2010-12-23 | Diaphragm, battery core and winding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106026242A CN102064302B (en) | 2010-12-23 | 2010-12-23 | Diaphragm, battery core and winding method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102064302A CN102064302A (en) | 2011-05-18 |
| CN102064302B true CN102064302B (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010106026242A Active CN102064302B (en) | 2010-12-23 | 2010-12-23 | Diaphragm, battery core and winding method thereof |
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| CN112542616A (en) * | 2020-12-04 | 2021-03-23 | 东莞新能安科技有限公司 | Electrochemical device and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5565281A (en) * | 1994-12-02 | 1996-10-15 | Hoechst Celanese Corporation | Shutdown, bilayer battery separator |
| CN201956407U (en) * | 2010-12-23 | 2011-08-31 | 深圳市量能科技有限公司 | Membrane and battery core |
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| CN102064302A (en) | 2011-05-18 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Diaphragm, battery core and winding method thereof Effective date of registration: 20160119 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2016990000049 |
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Date of cancellation: 20170118 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2016990000049 |
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Denomination of invention: Diaphragm, battery core and winding method thereof Effective date of registration: 20170120 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2017440020001 |
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Date of cancellation: 20180125 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2017440020001 |
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Denomination of invention: Diaphragm, battery core and winding method thereof Effective date of registration: 20180126 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2018440020008 |
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Date of cancellation: 20190111 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2018440020008 |
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Denomination of invention: Diaphragm, battery core and winding method thereof Effective date of registration: 20190111 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: Shenzhen EPT Battery Co., Ltd. Registration number: 2019440020007 |
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Date of cancellation: 20200414 Granted publication date: 20121114 Pledgee: Bank of Jiangsu Limited by Share Ltd Shenzhen branch Pledgor: SHENZHEN EPT BATTERY Co.,Ltd. Registration number: 2019440020007 |