CN208460853U - Diaphragm and lithium ion battery - Google Patents

Diaphragm and lithium ion battery Download PDF

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Publication number
CN208460853U
CN208460853U CN201820515289.4U CN201820515289U CN208460853U CN 208460853 U CN208460853 U CN 208460853U CN 201820515289 U CN201820515289 U CN 201820515289U CN 208460853 U CN208460853 U CN 208460853U
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China
Prior art keywords
diaphragm
stacked organic
base
organic block
lithium ion
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Active
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CN201820515289.4U
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Chinese (zh)
Inventor
程忠
张耀
林峰
陈辉
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Xinwangda Power Technology Co ltd
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Sunwoda Electronic Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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Abstract

The utility model discloses a kind of diaphragm, several stacked organic blocks including base and with compressibility;Stacked organic block interval is set to the single or double of base.Stacked organic block increases barrier action of the diaphragm between positive/negative plate, reduces the probability of positive and negative anodes internal short-circuit;The setting of stacked organic block interval provides better channel for the circulation and infiltration of electrolyte, and after the setting of stacked organic block interval, the area for covering base will tail off, and be able to maintain the good gas permeability of base;Stacked organic block also has compressibility, provides the space that can be rebounded for the expansion of cathode, reduces the risk of lithium ion battery deformation;Stacked organic block has caking property, and positive and negative plate is pasted onto diaphragm both sides, enhances the hardness of lithium ion battery ontology, provides good interface for lithium ion battery charge and discharge cycles process.

Description

Diaphragm and lithium ion battery
Technical field
The utility model relates to field of batteries, and in particular to a kind of diaphragm and lithium ion battery.
Background technique
The diaphragm of lithium ion battery is the key structure of lithium ion battery, is mainly used for isolating positive plate and negative electrode tab, resistance Only electronic conduction plays the role of insulation, while having uniform micro-pore inside diaphragm, enables lithium ion in positive and negative anodes It shuttles between piece, lithium ion battery is made to be able to carry out charging and discharging, complete deposit and the release of electric energy.
In the prior art, to keep the performance of lithium ion battery more preferable, membrane surface can be handled, but in the prior art After membrane surface is handled, there is larger impact to the performance for making diaphragm and lithium ion battery.
Utility model content
The main purpose of the utility model is to provide a kind of diaphragm and lithium ion battery, has more good performance.
The utility model proposes a kind of diaphragms, several organic accumulations including base and with caking property and compressibility Block, stacked organic block interval are set to the single or double of the base.
Further, the compressible ratio of the stacked organic block is 30-99%.
Further, the stacked organic block is set to the base by liquid phase sputtering method by organic polymer.
Further, between the stacked organic block between be divided into 0-500um.
Further, the width of the stacked organic block is 50-300um.
Further, the height of the stacked organic block is 1-20um.
Further, the base is polyethylene porous film layer, polypropylene porous film layer, non-woven fabrics porous membrane layer and polyamides One of imines film layer is a variety of.
Further, at least one side of the polyethylene porous film layer is equipped with aluminium oxide ceramics particle coating and/or vigorous nurse Feldspar particle coating;
At least one side of the polypropylene porous film layer is equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle Coating.
Further, the organic polymer is Kynoar, butadiene-styrene rubber, polymethyl acrylate, carboxymethyl cellulose One of plain sodium and polyacrylic acid a variety of are made.
This also proposes a kind of lithium ion battery with novel, including positive plate, negative electrode tab and above-mentioned diaphragm, the diaphragm Between the positive plate and the negative electrode tab.
The utility model has the beneficial effects that stacked organic block increases barrier action of the diaphragm between positive/negative plate, subtract The small probability of positive and negative anodes internal short-circuits;The setting of stacked organic block interval provides better lead to for the circulation and infiltration of electrolyte Road, and after the setting of stacked organic block interval, the area for covering base will tail off, and be able to maintain the good gas permeability of base;Have Machine heap block also has compressibility, provides the space that can be rebounded for the expansion of cathode, reduces lithium ion battery deformation Risk;Stacked organic block has caking property, and positive and negative plate is pasted onto diaphragm both sides, enhances the hard of lithium ion battery ontology Degree, provides good interface for lithium ion battery charge and discharge cycles process.
Detailed description of the invention
Fig. 1 is the stacked organic block SEM figure of an embodiment of the present invention septation;
Fig. 2 is the cross section structure schematic diagram of battery core in an embodiment of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1-2, a kind of diaphragm of an embodiment of the present invention is proposed, including base 2 and there is caking property and can Several stacked organic blocks 1 of compressibility;The interval of stacked organic block 1 is set to the single or double of base 2.
In the present embodiment, stacked organic block 1 increases barrier action of the diaphragm between positive/negative plate 4, reduces positive and negative The probability of pole internal short-circuit;The setting of the interval of stacked organic block 1, provides better channel for the circulation and infiltration of electrolyte, and After the setting of the interval of stacked organic block 1, the area of covering base 2 will tail off, and be able to maintain the good gas permeability of base 2;Stacked organic Block 1 also has compressibility, provides the space that can be rebounded for the expansion of cathode, reduces the wind of lithium ion battery deformation Danger;Stacked organic block 1 has caking property, and positive and negative plate 4 is pasted onto diaphragm both sides, enhances the hard of lithium ion battery ontology Degree, provides good interface for lithium ion battery charge and discharge cycles process.
In the present embodiment, stacked organic block 1 is set to base 2 by liquid phase sputtering method by organic polymer.Conventional liquid Phase sputtering method can more preferably control the distance between stacked organic block 1 and size, and stacked organic block 1 is made to have better effect.
In the present embodiment, base 2 is polyethylene porous film layer, polypropylene porous film layer, non-woven fabrics porous membrane layer and polyamides One of imines film layer is a variety of, and when base 2 is that a variety of film layers are made, various film layers are stacked, and between film layer Lamination order can be arbitrarily arranged.
Further, when base 2 is polyethylene porous film layer or includes polyethylene porous film layer, polyethylene porous film layer At least one side be equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle coating.
When base 2 is polypropylene porous film layer or includes polypropylene porous film layer, polypropylene porous film layer is at least It is equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle coating on one side.
It should be appreciated that aluminium oxide ceramics can be arranged simultaneously in polyethylene porous film layer or the one side of polypropylene porous film layer Particle coating and boehmite ceramic particle coating, can also be respectively provided with aluminium oxide ceramics particle coating or vigorous nurse on two sides respectively Aluminium oxide ceramics particle coating and boehmite ceramic particle coating can also be respectively set in feldspar particle coating on two sides.
It is appreciated that other ceramic coatings can also be set on polyethylene porous film layer or polypropylene porous film layer, ceramics The some or all of surface for being set to polyethylene porous film layer or polypropylene porous film layer of coating.
In the present embodiment, organic polymer is Kynoar, butadiene-styrene rubber, polymethyl acrylate, carboxymethyl cellulose One of sodium and polyacrylic acid a variety of are made.It should be appreciated that no matter organic polymer is made of how many kinds of material, only need to protect It demonstrate,proves its sputtering and forms organic accumulation block 1 with caking property and compressibility.
In the present embodiment, the compressible ratio of stacked organic block 1 is preferably set to 30-99%.
In the present embodiment, since stacked organic block 1 has caking property, so being directly bonded to base by common way On 2.
In the present embodiment, between stacked organic block 1 between be divided into and be preferably provided between 0-500um;Stacked organic block 1 Width is preferably provided in 50-300um;The highly preferable setting of stacked organic block 1 is in 1-20um.
It in the present embodiment, is arranged at intervals between 0-500um between stacked organic block 1, stacked organic block 1 can be greatly reduced The surface area for covering base 2 controls the surface area that stacked organic block 1 covers base 2 in 5-10%, even if increasing base 2 Stacked organic block 1 will not influence the gas permeability of 2 script of base, hence it is evident that process in being different from the prior art to base 2 surface Afterwards, the surface area of base 50-100% can be covered in the structure that 2 surface of base is formed, area coverage obviously increases, and makes base 2 Gas permeability increase 20-150% on the basis of the original, and the gas permeability of base 2 obviously increases, and will make lithium ion battery Performance is decreased obviously.After stacked organic block 1 is arranged, while keeping 2 gas permeability of base, the anti-shape of lithium ion battery is improved The performances such as change ability, hardness.
In the present embodiment, diaphragm is set between positive plate 3 and negative electrode tab 4, and stacked organic block 1 can only be set to base 2 On one side, for example, being set between positive plate 3 and base 2, and positive plate 3 and base 2 are consolidated using the caking property of stacked organic block 1 It is fixed, for another example, it is set between negative electrode tab 4 and base 2, and consolidated negative electrode tab 4 and base 2 using the caking property of stacked organic block 1 It is fixed, it is set between positive plate 3 and base 2, between negative electrode tab 4 and base 2 simultaneously for another example, and utilize the bonding of stacked organic block 1 Property by positive plate 3 and base 2, fixed, negative electrode tab 4 and base 2 are fixed.
The utility model also proposes a kind of lithium ion battery, including positive plate 3, negative electrode tab 4 and above-mentioned any one every Film, diaphragm is between positive plate 3 and the negative electrode tab 4;Further include electrolyte, electrolyte infiltrate positive plate 3, negative electrode tab 4 with And whole interfaces of diaphragm.In the present embodiment, positive plate 3, negative electrode tab 4 can be used conventional material with electrolyte and be made.
In order to which the technical effect of the utility model is better described, the utility model is by preparing specific lithium ion battery sample Product 1-9 simultaneously tests its partial properties and is illustrated.It should be noted that in lithium ion battery sample 1-9, only stacked organic on diaphragm The structure of block 1 is different, and without stacked organic block 1, only base 2 in lithium ion battery sample 9.In addition, lithium ion battery sample Width in product 1-8 between stacked organic block 1 is arbitrarily arranged between 0-500um, and width is arbitrarily arranged between 50-300um. The following table 1 is that the height of stacked organic block 1 and the specific data in surface density, surface density are that have in lithium ion battery sample 1-8 For machine heap block 1 in the density of 2 one side of base, lithium ion battery sample 7 is to be respectively provided with organic accumulation block 1 on the two sides of base 2, And the height of the stacked organic block 1 on 2 two sides of base is identical with surface density.The following table 2 is to the diaphragm in lithium ion battery sample 1-9 Carry out the resulting data of permeability test.The following table 3 is different multiplying electric discharge, to the discharge capacity of lithium ion battery sample 1-9 into Row tests resulting data.The following table 4 is 1000 1C/1C charge and discharge cycles capacity retention ratios to lithium ion battery sample 1-9 And battery core deformation carries out testing resulting data.
Table 1
Battery sample Highly (um) Surface density (g/m2)
1 1 0.4
2 9 0.7
3 12 0.5
4 10 0.65
5 6 1.0
6 5 1.5
7 9 0.7
8 20 1.2
Table 2
Battery sample Ventilative value s/100ml
1 158
2 159
3 156
4 158
5 160
6 162
7 164
8 159
9 157
Table 3
Table 4
Battery sample Circulation volume conservation rate (%) Thickness swelling ratio (%)
1 90.2 8.5
2 91.2 7.4
3 92.3 7.8
4 90.6 7.3
5 85.1 8.7
6 84.7 8.2
7 89.8 6.8
8 88.9 7.9
9 72.2 15.1 (being in micro- S type)
By upper table 2 it is found that organic accumulation block 1 is arranged in base 2 after, compared with being not provided with organic accumulation block 1, base 2 gas permeability does not have significant change.
By upper table 3 it is found that organic accumulation block 1 is arranged in base 2 after, compared with being not provided with organic accumulation block 1, lithium from Sub- battery is on multiplying power discharging property without significant difference.
By upper table 3 it is found that organic accumulation block 1 is arranged in base 2 after, compared with being not provided with organic accumulation block 1, improve Lithium ion battery does not influence the interior of lithium ion battery battery during charge and discharge cycles the problem of battery core dilatancy Resistance, cycle performance are guaranteed.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model, Equivalent structure or equivalent flow shift made by using the description of the utility model and the drawings, is directly or indirectly transported Used in other related technical areas, it is also included in the patent protection scope of the utility model.

Claims (10)

1. a kind of diaphragm, which is characterized in that several stacked organic blocks including base and with caking property and compressibility, institute State the single or double that stacked organic block interval is set to the base.
2. diaphragm as described in claim 1, which is characterized in that the compressible ratio of the stacked organic block is 30-99%.
3. diaphragm as described in claim 1, which is characterized in that the stacked organic block passes through liquid phase sputtering by organic polymer Method is set to the base.
4. diaphragm as described in claim 1, which is characterized in that be divided into 0-500um between the stacked organic block.
5. diaphragm as described in claim 1, which is characterized in that the width of the stacked organic block is 50-300um.
6. diaphragm as described in claim 1, which is characterized in that the height of the stacked organic block is 1-20um.
7. diaphragm as described in claim 1, which is characterized in that the base is polyethylene porous film layer, polypropylene porous film One of layer, non-woven fabrics porous membrane layer and polyimide film are a variety of.
8. diaphragm as claimed in claim 7, which is characterized in that at least one side of the polyethylene porous film layer is equipped with aluminium oxide Ceramic particle coating and/or boehmite ceramic particle coating;
At least one side of the polypropylene porous film layer is equipped with aluminium oxide ceramics particle coating and/or boehmite ceramic particle applies Layer.
9. diaphragm as claimed in claim 3, which is characterized in that the organic polymer is Kynoar, butadiene-styrene rubber, gathers One of methyl acrylate, sodium carboxymethylcellulose and polyacrylic acid a variety of are made.
10. a kind of lithium ion battery, which is characterized in that including any one of positive plate, negative electrode tab and claim 1 to 9 The diaphragm, the diaphragm is between the positive plate and the negative electrode tab.
CN201820515289.4U 2018-04-11 2018-04-11 Diaphragm and lithium ion battery Active CN208460853U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110034263A (en) * 2019-03-29 2019-07-19 欣旺达电动汽车电池有限公司 A kind of surface has the diaphragm and preparation method thereof of asperities
CN110380002A (en) * 2019-06-03 2019-10-25 江西力能新能源科技有限公司 A kind of boehmite/alumina composite lithium ion battery coating pole piece
WO2021195963A1 (en) * 2020-03-31 2021-10-07 宁德新能源科技有限公司 Separator, electrode assembly, battery, and electronic apparatus
WO2023077516A1 (en) * 2021-11-08 2023-05-11 宁德时代新能源科技股份有限公司 Negative pole piece and preparation method therefor, secondary battery, battery module, battery pack, and electric apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110034263A (en) * 2019-03-29 2019-07-19 欣旺达电动汽车电池有限公司 A kind of surface has the diaphragm and preparation method thereof of asperities
CN110380002A (en) * 2019-06-03 2019-10-25 江西力能新能源科技有限公司 A kind of boehmite/alumina composite lithium ion battery coating pole piece
WO2021195963A1 (en) * 2020-03-31 2021-10-07 宁德新能源科技有限公司 Separator, electrode assembly, battery, and electronic apparatus
US12002989B2 (en) 2020-03-31 2024-06-04 Ningde Amperex Technology Limited Separator, lithium-ion battery, and electronic device
WO2023077516A1 (en) * 2021-11-08 2023-05-11 宁德时代新能源科技股份有限公司 Negative pole piece and preparation method therefor, secondary battery, battery module, battery pack, and electric apparatus

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Effective date of registration: 20210508

Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province

Patentee after: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd.

Address before: 518000, 1st floor, 2nd floor, A-B area, 2nd floor, D area-9th floor, Yihe Road, Shiyan Street, Baoan District, Shenzhen City, Guangdong Province

Patentee before: SUNWODA ELECTRONICS Co.,Ltd.

CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province

Patentee after: Xinwangda Power Technology Co.,Ltd.

Address before: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province

Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd.