CN2914338Y - Laminated positive plate of lithium ion secondary battery, pole core and battery thereof - Google Patents
Laminated positive plate of lithium ion secondary battery, pole core and battery thereof Download PDFInfo
- Publication number
- CN2914338Y CN2914338Y CNU2005201298527U CN200520129852U CN2914338Y CN 2914338 Y CN2914338 Y CN 2914338Y CN U2005201298527 U CNU2005201298527 U CN U2005201298527U CN 200520129852 U CN200520129852 U CN 200520129852U CN 2914338 Y CN2914338 Y CN 2914338Y
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- positive plate
- positive
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- lithium ion
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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
Abstract
The utility model relates to a positive plate of laminated lithium ion secondary battery and the related battery. The positive plate is rectangular and includes a substrate, positive active materials coated on the substrate surface, and an insulation layer attached on the edge of the positive plate. The laminated lithium ion secondary battery includes an electrode core formed by sequentially laminating sheet-like positive plates and negative plates at two sides of a separation membrane, nonaqueous electrolyte, and a battery shell for sealing the electrode core and nonaqueous electrolyte. The positive plate and the negative plate are formed by coating active materials on the surface of substrates which have neck parts protruding outward to form current collectors, wherein the positive electrode is the one provided by the utility model. The laminated lithium ion secondary battery can suppress breakage of separation membrane due to burr or dressing at the edge of the positive plate when the positive and the negative plate expand in charge process, therefore avoiding short circuit.
Description
Technical field
The utility model is about a kind of lithium ion battery, specifically about a kind of positive plate and pole piece and battery thereof of Laminated Type Lithium Ion Secondary Battery.
Background technology
Along with science and technology development, lithium rechargeable battery is widely used as main high-energy secondary cell, and commonly used is coiled lithium-ion secondary battery in the market.
Square lithium ion secondary battery is as the power supply energy in fields such as mobile phone, computer and be widely used, at at present to cell high-capacity and powerful performance requirement, Chinese patent CN1591959A has proposed Laminated Type Lithium Ion Secondary Battery again, the positive plate of this Laminated Type Lithium Ion Secondary Battery is to be that active material is coated in the aluminium foil matrix surface and forms by the composite oxides that contain the lithium that can embed and deviate from lithium ion and transition metal, and the venturi portion that is extended out by the aluminium foil matrix is the collector of positive plate; Negative plate is to be that active material is coated in the Copper Foil matrix surface and forms by containing the material with carbon element that can embed and deviate from lithium ion, and the venturi portion that is extended out by the Copper Foil matrix is the collector of negative plate; Positive and negative electrode stacks gradually the two sides that is arranged in banded barrier film and forms pole piece with sheet form.This Laminated Type Lithium Ion Secondary Battery can make full use of the inner space of battery case, improves the energy density of battery; Reduce the internal resistance of battery, thereby improve the heavy-current discharge performance of lithium rechargeable battery.
In present lithium rechargeable battery, to deviate from and have the negative plate of relevant position can receive lithium ion from positive plate in order to guarantee lithium ion, the general anode sheet will be wider than positive plate.For example: the width of positive plate is 43 millimeters, 32 millimeters of length, and then the width of negative plate is 44 millimeters, length is 33 millimeters.In addition, wish that also barrier film is thin as much as possible, be generally 0.025 millimeter or following thickness.
Yet this Laminated Type Lithium Ion Secondary Battery but exists the higher shortcoming of short circuit ratio.
A kind of Laminated Type Lithium Ion Secondary Battery that prevents short circuit by control pole piece and diaphragm size is disclosed at JP2000030742.But the short circuit ratio of so stacked battery is still higher.
The utility model content
The purpose of this utility model is that the positive plate that overcomes in the existing Laminated Type Lithium Ion Secondary Battery makes the higher shortcoming of Laminated Type Lithium Ion Secondary Battery short circuit ratio, a kind of positive plate of new Laminated Type Lithium Ion Secondary Battery is provided, uses the short circuit ratio of Laminated Type Lithium Ion Secondary Battery of this positive plate lower.Another object of the present invention provides the Laminated Type Lithium Ion Secondary Battery that comprises this positive plate.
Inventor of the present utility model finds that the generation of Laminated Type Lithium Ion Secondary Battery short circuit is mainly caused by the direct contact of positive and negative plate.In the production and use of reality, make the burr at pole piece edge puncture barrier film owing to battery is extruded, and the dendrite of growing in the charging process puncture the major reason that barrier film is the lithium rechargeable battery short circuit.
For example, the negative pole of lithium rechargeable battery is made up of material with carbon element that can receive lithium or metal oxide, in the charging process, lithium ion deviates to enter negative plate from positive plate, negative plate can expand after receiving lithium ion, expansion rate is 6%～10%, and positive plate is after deviating from lithium ion, also can expand, expansion rate about 3%, therefore, in charging process, the expansion of positive and negative plate causes the barrier film between positive and negative plate oppressed, causes battery short circuit thereby cause the burr at pole piece edge to puncture barrier film.In order to solve Laminated Type Lithium Ion Secondary Battery short circuit ratio problem of higher, inventor of the present utility model has invented following technical scheme.
Positive plate provided by the utility model is shaped as rectangle, and positive plate comprises matrix and be coated in the positive electrode active materials of matrix surface that the edge of this positive plate posts insulating barrier.
Laminated Type Lithium Ion Secondary Battery of the present utility model comprises with sheet form and stacks gradually the positive plate that is arranged in the barrier film two sides, negative plate and the Battery Pole Core and the nonaqueous electrolytic solution that form, and be sealed in the battery case jointly, described positive plate, negative plate form by active material is coated in matrix surface, and constitute collector by the venturi portion that matrix extends out, wherein, the positive plate that provides for the utility model of described positive plate.
Because can there be coming off of pole piece burrs on edges or edge dressing in positive plate in the process of cutting, and the size of burr is at 0.05 millimeter～0.1 millimeter, if insulating barriers such as employing adhesive plaster encase its edge, burr just can't puncture adhesive plaster, and the dressing at edge simultaneously just can not come off yet.Again because the size of positive plate is less than negative plate, therefore, the edge of positive plate is all facing to the face of negative plate certainly, and this just makes the burrs on edges of positive plate or the dressing of caducous edge be under control by encasing of insulating tape.Compared with prior art, owing to adopted above scheme, this battery can stop the extruding that expansion caused because of positive and negative plate in charging process, the burrs on edges or the edge dressing that comes off that cause positive plate to exist in the process of cutting puncture barrier film, and battery short circuit takes place.
Description of drawings
Fig. 1 is a positive plate schematic diagram of the present utility model;
Fig. 2 is a negative plate schematic diagram of the present utility model;
Fig. 3 is a Battery Pole Core lamination schematic diagram of the present utility model.
In the accompanying drawing: 1-positive plate, 2-insulating barrier, 3-positive pole ear, 4-negative plate, 5-negative lug, 6-barrier film, the anodal matrix of 7-, 8-negative pole matrix.
Embodiment
Below in conjunction with accompanying drawing Laminated Type Lithium Ion Secondary Battery of the present utility model is elaborated.
As shown in Figure 1, 2, the positive plate that the utility model provides is shaped as rectangle, and positive plate 1 comprises matrix 7 and is coated in the positive electrode active materials on matrix 7 surfaces, this positive plate 1 integral body is less than negative plate 4, be the length L n that the length L p of positive plate 1 is less than or equal to negative plate 4, the width W p of positive plate 1 is less than or equal to the width W n of negative plate 4, and the edge of positive plate 1 posts the insulating barrier 2 of 0.1 millimeter～1 mm wide.Rectangle described here comprises square.
Consisting of of positive plate is as well known to those skilled in the art.In general, positive plate comprises conducting base and coating and/or is filled in positive electrode active materials on the conducting base (also being collector body).Described conducting base is as well known to those skilled in the art, can be selected from aluminium foil as conducting base; Described positive electrode active materials is as well known to those skilled in the art, and it comprises positive active material and adhesive, and described positive active material can be selected from positive active material commonly used in the lithium ion battery, as LiCoO
2Deng, described adhesive also is as well known to those skilled in the art, as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) etc., in general, the content of adhesive is the 0.01-8 weight % of positive active material, described positive active material can also comprise anodal auxiliary agent, the kind and the content of anodal auxiliary agent are as well known to those skilled in the art, anodal auxiliary agent is selected from conductive agent, at least a as in acetylene black, conductive carbon black and the electrically conductive graphite, its content is the 0-15 weight % of positive active material, is preferably 0-10 weight %.
Consisting of of negative plate is as well known to those skilled in the art, and in general, negative plate comprises conducting base and coating and/or is filled in negative active core-shell material on the conducting base.Described conducting base is as well known to those skilled in the art, is selected from Copper Foil as conducting base; Described negative active core-shell material is as well known to those skilled in the art, and it comprises negative electrode active material and adhesive, and described negative electrode active material can be selected from lithium ion battery negative electrode active material commonly used, as native graphite, Delanium etc.Described adhesive also is as well known to those skilled in the art, and as polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyvinyl alcohol etc., in general, the content of adhesive is the 0.01-10 weight % of negative electrode active material, is preferably 1-9 weight %.
Barrier film is arranged between positive plate and the negative plate, what barrier film adopted is various barrier films commonly used in the lithium ion battery, well known to a person skilled in the art material as polypropylene mat, polyethylene felt, polyolefin micro porous polyolefin membrane or ultra-fine fibre glass paper etc., it has electrical insulation capability and liquid retainability energy.
Described positive plate and negative plate can be commercially available, and also can adopt conventional method preparation, just positive plate 1 edge are posted insulating barrier and get final product.
The preparation method of conventional positive plate is for applying a kind of slurries that contain positive active material and adhesive on the wide cut pole piece, drying, rolling are also cut, and obtain positive plate.Wherein, the described solvent that contains positive active material and adhesive slurries is selected from conventional solvent, and as N-methyl pyrrolidone (NMP), dimethyl formamide (DMF) etc., the consumption of solvent can make described slurries can be coated on the described collector body and get final product.In general, the consumption of solvent is the 40-90 weight % of positive active material content in the slurries, is preferably 50-85 weight %.Dry temperature is generally 50-160 ℃, preferred 80-150 ℃.Rolling is in order to make the wide cut pole piece rolling that is purchased become the required thickness of positive plate, and this thickness can be according to various battery needs and change in very large range.The purpose of cutting is in order to make the wide cut pole piece be cut into the needed width of positive plate, and this width can be according to various battery needs and change in very large range.
The preparation method of negative plate is identical with the preparation method of positive plate, and the slurries that just will contain negative electrode active material and adhesive replace containing the slurries of positive active material and adhesive.
Described nonaqueous electrolytic solution is this area nonaqueous electrolytic solution commonly used, as the mixed solution of electrolyte lithium salt and nonaqueous solvents.Electrolyte lithium salt is selected from lithium hexafluoro phosphate (LiPF
6), in lithium perchlorate, LiBF4, hexafluoroarsenate lithium, lithium halide, chlorine lithium aluminate and the fluorocarbon based sulfonic acid lithium one or more.Organic solvent can be selected from chain acid esters and ring-type acid esters mixed solution, wherein the chain acid esters can be fluorine-containing for dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), carbonic acid first propyl ester (MPC), dipropyl carbonate (DPC) and other, sulfur-bearing or contain at least a in the chain organosilane ester of unsaturated bond.The ring-type acid esters can (γ-BL), sultone and other be fluorine-containing, sulfur-bearing or contain at least a in the ring-type organosilane ester of unsaturated bond for ethylene carbonate (EC), propene carbonate (PC), vinylene carbonate (VC), gamma-butyrolacton.In the described nonaqueous electrolytic solution, the concentration of electrolyte lithium salt is generally the 0.1-2 mol, is preferably the 0.8-1.2 mol.
Positive plate, negative plate and the barrier film between positive plate and negative plate are laminated the method for Battery Pole Core, and the assemble method of battery is known in those skilled in the art, do not repeat them here.
The following examples will be described further the utility model.
[embodiment]
(1) preparation of positive plate 1
Positive active material LiCoO with 100 parts of weight
2, the conductive agent graphite of 7 parts of weight, 7 parts of weight binding agent PVDF join among the NMP of 60 parts of weight and be uniformly mixed into paste, then it is coated in equably thickness and is on 0.02 millimeter the aluminium foil, again the anode sizing agent on positive pole ear 3 surfaces of aluminium foil extension is scraped off after applying evenly, drying, compressing tablet, to cut and stick at the pole piece edge width be 1 millimeter insulation polypropylene adhesive plaster 2, obtaining Lp is 44 millimeters, Wp is 31 millimeters, thick is 0.125 millimeter positive plate, the positive active material LiCoO on this positive plate
2Content is 0.67 gram, as shown in Figure 1.
(2) preparation of negative plate 4
The binding agent PTFE of the negative electrode active material Delanium of 100 parts of weight, 7 parts of weight is joined among the NMP of 60 parts of weight and be uniformly mixed into paste, then it is coated in equably thickness and is on 0.012 millimeter the Copper Foil, again the cathode size on negative lug 5 surfaces of Copper Foil extension is scraped off after applying evenly, drying, compressing tablet, cut, obtaining Ln is 45 millimeters, Wn is 32 millimeters, thick is 0.120 millimeter negative plate, negative electrode active material Delanium content on the negative plate is 0.35 gram, as shown in Figure 2.
(3) preparation of Battery Pole Core
With positive plate 1, the negative plate 4 of (1) and (2) preparation stack gradually wide be 47 millimeters, thick is that the two sides of 0.020 millimeter barrier film 6 obtains stacked battery pole piece, what barrier film 6 adopted is polypropylene screen, as shown in Figure 3.
(4) assembling of battery
With LiPF
6Be configured to LiPF with EC and DMC
6Concentration is the solution (volume ratio of EC/DMC is 1: 1) of 1 mol, obtains nonaqueous electrolytic solution, and the consumption of nonaqueous electrolytic solution is 2.2 grams/only.The Battery Pole Core that (3) are obtained is inserted in 50 * 34 * 5 millimeters the battery container, injects above-mentioned nonaqueous electrolytic solution, by the battery cover board sealing, makes Laminated Type Lithium Ion Secondary Battery, i.e. the present embodiment battery.
What present embodiment illustrated is pole piece and the lithium ion battery that the utility model provides, and prepares 50 same batteries altogether.
[Comparative Examples]
What this Comparative Examples illustrated is the pole piece and the lithium ion battery of prior art.
Method according to embodiment prepares pole piece and lithium ion battery, and different is when preparation positive plate 1, does not paste insulating tape 2 at the edge of positive plate 1, the same embodiment of all the other manufacture methods.Prepare 50 same batteries altogether.
Below [embodiment] measured with the short circuit ratio that battery took place of [Comparative Examples] preparation, assay method is as follows:
1) two kinds of batteries is full of electricity to 4.2V;
2) two kinds of batteries that are full of electricity are pushed, begin to descend until the voltage of battery;
3) statistics is after battery damaged by pressure, and battery temperature rises the gas that produces and the number of batteries that causes safety valve to start.
The result who measures is as follows:
The quantity that [embodiment] safety valve starts: in 50 same batteries of preparation, have 1 safety valve to start;
The quantity that [Comparative Examples] safety valve starts: in 50 same batteries of preparation, have 18 safety valves to start.
Can find out significantly according to the result who measures, Laminated Type Lithium Ion Secondary Battery of the present utility model can greatly reduce battery after charging because of the expand burr at the positive plate edge cause or caducous dressing of positive and negative plate punctures barrier film and comes in contact with negative plate, thereby also reduced the hidden danger that battery is short-circuited further.
Claims (6)
1, a kind of positive plate of Laminated Type Lithium Ion Secondary Battery, this positive plate (1) be shaped as rectangle, and positive plate (1) comprises matrix (7) and is coated in the positive electrode active materials on matrix (7) surface, it is characterized in that the edge of this positive plate (1) posts insulating barrier (2).
2, pole piece according to claim 1, wherein, the width of described insulating barrier (2) is 0.1 millimeter～1 millimeter.
3, pole piece according to claim 1, wherein, described insulating barrier (2) is polypropylene, polyethylene adhesive plaster.
4, a kind of Laminated Type Lithium Ion Secondary Battery pole piece, this pole piece comprises with sheet form and stacks gradually positive plate (1), the negative plate (4) that is arranged in barrier film (6) two sides, described positive plate (1), negative plate (4) comprise anodal matrix (7), negative pole matrix (8) respectively and are coated in the active material on anodal matrix (7) surface, negative pole matrix (8) surface, and constitute collector by the venturi portion that matrix extends out, it is characterized in that, positive plate (1) is any described positive plate among the claim 1-3, and positive plate (1) is whole less than negative plate (4).
5, pole piece according to claim 4, wherein, the length L p of positive plate (1) is less than the length L n of negative plate (4), and the width W p of positive plate (1) is less than the width W n of negative plate (4).
6, a kind of Laminated Type Lithium Ion Secondary Battery, this battery comprise Battery Pole Core and the nonaqueous electrolytic solution that is sealed in jointly in the battery case, it is characterized in that described Battery Pole Core is the described Battery Pole Core of claim 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201298527U CN2914338Y (en) | 2005-10-18 | 2005-10-18 | Laminated positive plate of lithium ion secondary battery, pole core and battery thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2005201298527U CN2914338Y (en) | 2005-10-18 | 2005-10-18 | Laminated positive plate of lithium ion secondary battery, pole core and battery thereof |
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| CN2914338Y true CN2914338Y (en) | 2007-06-20 |
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| CNU2005201298527U Expired - Lifetime CN2914338Y (en) | 2005-10-18 | 2005-10-18 | Laminated positive plate of lithium ion secondary battery, pole core and battery thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474621A (en) * | 2012-06-07 | 2013-12-25 | 深圳市海盈科技有限公司 | Pole piece and laminated electrical core body for lithium ion battery |
| CN106384846A (en) * | 2016-10-14 | 2017-02-08 | 四川赛尔雷新能源科技有限公司 | Method for coating battery core of lithium battery with solid diaphragm adhesive in insulation manner |
| CN107768673A (en) * | 2016-08-23 | 2018-03-06 | 宁德新能源科技有限公司 | Modified foam metal, electrode slice and secondary cell |
| CN108417886A (en) * | 2018-03-06 | 2018-08-17 | 深圳前海优容科技有限公司 | Battery core and its manufacturing method, battery |
| CN108428854A (en) * | 2018-03-06 | 2018-08-21 | 深圳前海优容科技有限公司 | A kind of battery core and its manufacturing method, battery and electronic device |
| CN109659596A (en) * | 2017-10-12 | 2019-04-19 | 大众汽车有限公司 | For the lithium ion battery of electric energy accumulator, accumulator |
| WO2019169557A1 (en) * | 2018-03-06 | 2019-09-12 | 深圳前海优容科技有限公司 | Cell and manufacturing method therefor, battery, and electronic device |
| CN112490402A (en) * | 2019-09-12 | 2021-03-12 | 比亚迪股份有限公司 | Battery, battery module, battery pack and automobile |
| CN114335426A (en) * | 2022-02-11 | 2022-04-12 | 上海兰钧新能源科技有限公司 | Positive plate, laminated cell and preparation method of laminated cell |
| CN114447282A (en) * | 2020-10-30 | 2022-05-06 | 北京小米移动软件有限公司 | Pole piece, processing method thereof and lithium battery |
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2005
- 2005-10-18 CN CNU2005201298527U patent/CN2914338Y/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474621A (en) * | 2012-06-07 | 2013-12-25 | 深圳市海盈科技有限公司 | Pole piece and laminated electrical core body for lithium ion battery |
| CN107768673A (en) * | 2016-08-23 | 2018-03-06 | 宁德新能源科技有限公司 | Modified foam metal, electrode slice and secondary cell |
| CN106384846A (en) * | 2016-10-14 | 2017-02-08 | 四川赛尔雷新能源科技有限公司 | Method for coating battery core of lithium battery with solid diaphragm adhesive in insulation manner |
| CN109659596A (en) * | 2017-10-12 | 2019-04-19 | 大众汽车有限公司 | For the lithium ion battery of electric energy accumulator, accumulator |
| CN108417886A (en) * | 2018-03-06 | 2018-08-17 | 深圳前海优容科技有限公司 | Battery core and its manufacturing method, battery |
| CN108428854A (en) * | 2018-03-06 | 2018-08-21 | 深圳前海优容科技有限公司 | A kind of battery core and its manufacturing method, battery and electronic device |
| WO2019169557A1 (en) * | 2018-03-06 | 2019-09-12 | 深圳前海优容科技有限公司 | Cell and manufacturing method therefor, battery, and electronic device |
| CN108428854B (en) * | 2018-03-06 | 2024-01-16 | 深圳前海优容科技有限公司 | Battery cell, manufacturing method thereof, battery and electronic device |
| CN112490402A (en) * | 2019-09-12 | 2021-03-12 | 比亚迪股份有限公司 | Battery, battery module, battery pack and automobile |
| WO2021047450A1 (en) * | 2019-09-12 | 2021-03-18 | 比亚迪股份有限公司 | Battery, battery module, battery pack, and automobile |
| CN114447282A (en) * | 2020-10-30 | 2022-05-06 | 北京小米移动软件有限公司 | Pole piece, processing method thereof and lithium battery |
| CN114335426A (en) * | 2022-02-11 | 2022-04-12 | 上海兰钧新能源科技有限公司 | Positive plate, laminated cell and preparation method of laminated cell |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen BYD Lithium Battery Co., Ltd. Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.4.25 to 2012.11.19 Contract record no.: 2008440000071 Denomination of utility model: Laminated positive plate of lithium ion secondary battery, pole core and battery thereof Granted publication date: 20070620 License type: Exclusive license Record date: 20080513 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.4.25 TO 2012.11.19 Name of requester: SHENZHEN BYD LITHIUM BATTERY CO., LTD. Effective date: 20080513 |
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Shenzhen BYD Lithium Battery Co., Ltd. Assignor: Biyadi Co., Ltd. Contract fulfillment period: 2008.11.12 to 2014.4.30 Contract record no.: 2008440000368 Denomination of utility model: Laminated positive plate of lithium ion secondary battery, pole core and battery thereof Granted publication date: 20070620 License type: Exclusive license Record date: 20081113 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.11.12 TO 2014.4.30; CHANGE OF CONTRACT Name of requester: SHENZHEN CITY BIYADILI BATTERY CO., LTD. Effective date: 20081113 |
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| CX01 | Expiry of patent term |
Granted publication date: 20070620 |
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| EXPY | Termination of patent right or utility model |