CN102227031A - Lithium ion battery with high-rate discharge characteristic - Google Patents
Lithium ion battery with high-rate discharge characteristic Download PDFInfo
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- CN102227031A CN102227031A CN2011101328772A CN201110132877A CN102227031A CN 102227031 A CN102227031 A CN 102227031A CN 2011101328772 A CN2011101328772 A CN 2011101328772A CN 201110132877 A CN201110132877 A CN 201110132877A CN 102227031 A CN102227031 A CN 102227031A
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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
Abstract
The invention relates to a lithium ion battery with a high-rate discharge characteristic, comprising a shell and a battery cell in the shell, wherein the battery cell is formed by coiling no less than three positive pole pieces, negative pole pieces and diaphragms; the positive pole pieces are provided with positive pole lugs respectively; the negative pole pieces are provided with negative pole lugs respectively; each positive pole lug is formed by welding one or more pole lugs in an overlaying mode, and the exposed lengths of the positive pole lugs are different; the number of the negative pole lugs is equal to that of the positive pole lugs, and each negative pole lug is formed by welding one or more lugs in an overlaying mode as well as the exposed lengths of the negative pole lugs are different; and the positive pole pieces are surrounded by the negative pole lugs completely. The lithium ion battery has the advantages that the battery cell meets requirements of low internal-resistance and high-rate discharge of lithium ion secondary batteries with a square or round coiling structure; the design technology is simple and the batch production is easy; and the increment and the reduction of the pole lugs can be changed in accordance with requirements of the battery structure, the battery size and the discharge current.
Description
Technical field
The present invention relates to a kind of lithium rechargeable battery, especially a kind of lithium ion battery with high-multiplying power discharge characteristic.
Background technology
Lithium ion battery has that self-discharge rate is low, the good characteristic of good cycle, is developed rapidly in recent years and uses.Many electric tools and battery corollary equipment producer improve constantly the requirement of lithium rechargeable battery, need moment to start as lithium cell charging formula electric drill, driver, electric screwdriver etc., so need to provide big electric current to equipment.The condition of reducing and face exhaustion gradually along with non-renewable energy resources such as oil, gasoline, so need a kind of cleaning more, reproducible energy substitution, along with the practicality of lithium rechargeable battery in the electric bicycle industry, and it is ripe gradually, electronic taxi, electronic big bus, hybrid vehicle be using of small lot also, and these electric vehicles are starting, climb, also needing moment that heavy-current discharge can be provided when quickening.
The electrode slice design of existing traditional lithium rechargeable battery has only single positive pole ear and single negative lug, the battery of this structure is not under little multiplying power or multiplying power are very high discharge scenario, influence is not clearly to energy content of battery density in the internal resistance of battery, but polarization phenomena are serious when high-multiplying power discharge, because the pressure drop that polarization causes makes cell voltage low to the battery limiting voltage down in limited time, the energy that can reduce battery discharges, if internal resistance is when excessive, can cause when big multiplying power discharging that battery temperature is too high to have little time to dispel the heat and damage the inside battery structure and reduce the electrical property and the security performance of battery.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of lithium ion battery with high-multiplying power discharge characteristic is provided, is a kind of lithium rechargeable battery with low internal resistance, high-multiplying power discharge characteristic.
According to technical scheme provided by the invention, a kind of lithium ion battery with high-multiplying power discharge characteristic comprises housing and is positioned at the electric core of housing, described electric core by anode pole piece, cathode pole piece, membrane coil around forming; Described anode pole piece is provided with positive pole ear, and described cathode pole piece is provided with negative lug, and the quantity of described positive pole ear is more than three, and each positive pole ear is welded by one or more lugs are overlapping respectively, the protruded length difference of each positive pole ear; The quantity of described negative lug is identical with positive pole ear, and each negative lug is welded by one or more lugs are overlapping respectively, the protruded length difference of each negative lug; Described cathode pole piece encases anode pole piece fully.
As preferably, the width of described cathode pole piece sheet subtracts the width 〉=0.5mm of anode pole piece.Described positive pole ear comprises first positive pole ear, second positive pole ear and the 3rd positive pole ear, described first positive pole ear, second positive pole ear and the 3rd positive pole ear are welded by one or more lugs are overlapping respectively, the protruded length difference of first positive pole ear, second positive pole ear, the 3rd positive pole ear; Described negative lug comprises first negative lug, second negative lug and the 3rd negative lug, described first negative lug, second negative lug and the 3rd negative lug are welded by one or more lugs are overlapping respectively, the protruded length difference of first negative lug, second negative lug, the 3rd negative lug.
Advantage of the present invention is: electric core of the present invention is applicable to the square of winding-structure and the battery design that the low internal resistance of cylinder type lithium ion secondary battery, high-multiplying power discharge require; Its design technology is simple, and is easy and simple to handle, produces in batches easily; The increase of lug or reduce and to change along with the requirement of size, size and the discharging current size of the structure of battery.
Description of drawings
Fig. 1 is negative pole piece of battery project organization figure of the present invention.
Fig. 2 is anode pole piece project organization figure of the present invention.
Fig. 3 is core strueture figure of the present invention.
Fig. 4 is the embodiment of the invention and comparative example cyclic curve figure.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
Lithium ion battery mainly is made up of positive plate, negative plate, nonaqueous electrolytic solution, barrier film and shell.Be inserted in the battery case at pole piece, inject electrolyte and package sealing and finish, then with the battery forming and capacity dividing.
Lithium ion battery of the present invention comprises housing and is positioned at the electric core of housing, described electric core by anode pole piece, cathode pole piece, membrane coil around forming; As shown in Figure 3, described anode pole piece is provided with positive pole ear, described cathode pole piece is provided with negative lug, described positive pole ear comprises first positive pole ear 1, second positive pole ear 2 and the 3rd positive pole ear 3, described first positive pole ear 1, second positive pole ear 2 and the 3rd positive pole ear 3 are welded by one or more lugs are overlapping respectively, the protruded length difference of 3 positive pole ears is as the protruded length+4mm of protruded length+2mm=first positive pole ear of protruded length=second positive pole ear of the 3rd positive pole ear.Described negative lug comprises first negative lug 4, second negative lug 5 and the 3rd negative lug 6, described first negative lug 4, second negative lug 5 and the 3rd negative lug 6 are welded by one or more lugs are overlapping respectively, the protruded length difference of 3 negative lug is as the protruded length+4mm of protruded length+2mm=first negative lug of protruded length=second negative lug of the 3rd negative lug; Described cathode pole piece encases anode pole piece fully.
Positive pole ear and the negative lug of the design of the electrode slice of this battery more than three or three, and effectively distribute and contraposition, the lithium rechargeable battery that adopts this method to make, internal resistance is significantly reduced, and electric current distribution is even, high-rate discharge ability will obviously promote, and can satisfy the requirement of high-multiplying power discharge equipment, as electric tool, electric automobile, hybrid vehicle etc.
As Fig. 1, shown in 2, multipole ear design of the present invention comprises: first positive pole ear 1, second positive pole ear 2, the 3rd positive pole ear 3, negative lug and positive pole roughly the same comprise first negative lug 4, second negative lug 5 and the 3rd negative lug 6.X, Y, Z represent the protruded length of negative lug, Z=Y+2=X+4, L=A1+A2+B+C+3d among Fig. 1, the blank of reserving when d is coating, so that welding is used, d is of a size of 2mm～25mm, W is the width of negative plate, and the W value designs according to the overall height of battery.
P, Q, F represent the protruded length of positive pole ear, F=Q+2=F+4, L1=D1+D2+E+F+3k among Fig. 2, the blank of reserving when k is coating, so that welding is used, k is of a size of 2mm～25mm, W2 is the width of positive plate, and the W2 value designs according to the overall height of battery.W-W2≥0.5mm。
First negative lug 4, second negative lug 5 and the 3rd negative lug 6 are the nickel sheet, nickel plating copper sheet, copper sheet, copper nickel compound piece, multilayer copper foil welding or the lead-out tablet that is riveted together and makes, first positive pole ear 1, second positive pole ear 2, the 3rd positive pole ear 3 are aluminium flake, laminated aluminium foil welding or the lead-out tablet that is riveted together and makes.
Above-mentioned pole piece is reeled in the following manner: in the volume pin of at first cathode pole piece being reeled earlier, head rolls up length at 0.5～2.5 circle, the corresponding D2 fragment position of A2 section, the corresponding F section of B section, C section correspondence E section, A1 section correspondence D1 section.After coiling finishes, electric core is cemented, enter next process with stopping adhesive tape.The welding position of positive pole ear distributes according to the contraposition position of above-mentioned design, and the principle of distribution requires to carry out according to the output density of electric current, and the method for designing of negative pole is with anodal consistent.
Described anode pole piece material is aluminium foil or aluminium net, and the cathode pole piece material is Copper Foil or copper mesh.
Manufacture craft is: with the PVDF (Kynoar) of ormal weight, put among the NMP (N-methyl pyrrolidone), start beater, and be dissolved in PVDF among the NMP fully by certain speed, LiFePO 4 material is added in this solution, fully be mixed and made into slurry, it consists of LiFePO
4: PVDF: acetylene black: Super-P (super carbon black)=91: 4: 3: 2.Again the method for this slurry with intermittently coating is coated on the aluminium foil of 18 μ m equably, dry down in 100 ℃.Obtain the positive plate that thickness is 100 μ m after the roll-in, the position of k welding 5*0.15 aluminium pole ears in as Fig. 2.
PVDF (Kynoar) with ormal weight, put in the pure water, start beater, and be dissolved in PVDF in the pure water fully by certain speed, MCMB (carbonaceous mesophase spherules) is added in this solution, fully be mixed and made into slurry, it consists of MCMB: PVDF: VGCF (nanometer overlength carbon fiber)=95: 4: 1.Again the method for this slurry with intermittently coating is coated on the Copper Foil of 12 μ m equably, dry down in 100 ℃.Obtain the negative plate that thickness is 90 μ m after the roll-in, the position of d welding 4*0.10 copper polar ear in as Fig. 1.
Above-mentioned positive and negative plate is wound into the electric core of lithium ion battery, and is inserted in the shell, spot welding, electrolyte injects battery case and makes the lithium rechargeable battery that model is IFR26650.
Comparative example of the present invention uses and the similar prepared battery of present embodiment, but does not have three lugs, makes the IFR26650 lithium ion battery but carry out the monopole ear welding procedure in any lug position of three lugs.
Below be that test of embodiment and comparative example cycle performance of battery and related data compare.
One, cycle performance test.
The battery that adopts above-mentioned three lugs and monopole ear to produce change into and partial volume after, embodiment and comparative example battery are carried out volume test as follows:
(1) under 22 ℃ of environment, with the 1C constant-current constant-voltage charging, requiring upper voltage limit is 3.9V, and cut-off current 0.05C shelved 5 minutes;
(2) with the 20C constant-current discharge to 2.0V, shelved 5 minutes;
(3) repeat above step 500 time, it is as shown in the table to record the capacity sustainment rate of embodiment and comparative example.
In the foregoing description, after 500 circulations of battery, the capacity sustainment rate is 98.7%; In the Comparative Examples, after 370 circulations of battery, the capacity sustainment rate has only about 84.5%, is illustrated in figure 4 as and improves the front and back battery cycle life relatively, and a is a monopole ear 4A discharge cycles curve, and b is three lug 4A discharge cycles curves.
Two, loop test internal resistance performance.
Use internal resistance test device accurately to measure embodiment and comparative example internal resistance of cell value, under 22 ℃ of environment, internal resistance of cell value is accurately measured in battery circulation 500 times once more, and it is as shown in the table for test result.
In a word, compare with existing lithium-ion electric pool technology, the present invention has following advantage:
1, behind the multipole ear, the current density of discharge will increase, and discharging current is evenly distributed, and is particularly suitable for heavy-current discharge;
2, by improving multipole ear polarization is influenced low effect, thereby improve cycle performance, heavy-current discharge performance and the security performance etc. of battery;
3, guided sense of current, on the pole piece of unit effective area, the mobile distance of multipole ear design shortening electric current has further improved power output;
4, this battery still can continue to use after situation about being short-circuited, and the rated capacity of battery changes little.
Tables of data before and after the embodiment of the invention and the circulation of comparative example battery.
Claims (3)
1. lithium ion battery with high-multiplying power discharge characteristic comprises housing and is positioned at the electric core of housing, described electric core by anode pole piece, cathode pole piece, membrane coil around forming; Described anode pole piece is provided with positive pole ear, described cathode pole piece is provided with negative lug, it is characterized in that: the quantity of described positive pole ear is more than three, and each positive pole ear is welded by one or more lugs are overlapping respectively, the protruded length difference of each positive pole ear; The quantity of described negative lug is identical with positive pole ear, and each negative lug is welded by one or more lugs are overlapping respectively, the protruded length difference of each negative lug; Described cathode pole piece encases anode pole piece fully.
2. a kind of according to claim 1 lithium ion battery with high-multiplying power discharge characteristic is characterized in that the width of described cathode pole piece subtracts the width 〉=0.5mm of anode pole piece.
3. a kind of according to claim 1 lithium ion battery with high-multiplying power discharge characteristic, it is characterized in that described positive pole ear comprises first positive pole ear, second positive pole ear and the 3rd positive pole ear, described first positive pole ear, second positive pole ear and the 3rd positive pole ear are welded by one or more lugs are overlapping respectively, the protruded length difference of first positive pole ear, second positive pole ear, the 3rd positive pole ear; Described negative lug comprises first negative lug, second negative lug and the 3rd negative lug, described first negative lug, second negative lug and the 3rd negative lug are welded by one or more lugs are overlapping respectively, the protruded length difference of first negative lug, second negative lug, the 3rd negative lug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101328772A CN102227031A (en) | 2011-05-20 | 2011-05-20 | Lithium ion battery with high-rate discharge characteristic |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101328772A CN102227031A (en) | 2011-05-20 | 2011-05-20 | Lithium ion battery with high-rate discharge characteristic |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102569711A (en) * | 2011-12-29 | 2012-07-11 | 曙鹏科技（深圳）有限公司 | Lithium ion battery and manufacturing method thereof |
| CN103296245A (en) * | 2013-05-02 | 2013-09-11 | 浙江努奥罗新能源科技有限公司 | Cylinder lithium battery |
| TWI462380B (en) * | 2011-12-20 | 2014-11-21 | Au Optronics Corp | Battery core and method of manufacturing the same |
| CN106695184A (en) * | 2016-11-29 | 2017-05-24 | 中国电子科技集团公司第十八研究所 | Method for welding electrode lug of flexible package lithium ion battery |
| CN107768676A (en) * | 2017-09-05 | 2018-03-06 | 东莞市迈科新能源有限公司 | A kind of lithium ion battery and its pole piece |
| CN113661608A (en) * | 2020-12-22 | 2021-11-16 | 宁德新能源科技有限公司 | Electrochemical device and electricity utilization device |
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| CN1540792A (en) * | 2003-10-31 | 2004-10-27 | 中信国安盟固利电源技术有限公司 | Method for making core of soft packaged lithium ion dynamic battery |
| US20050084750A1 (en) * | 2003-09-01 | 2005-04-21 | Byd America Corporation | Lithium ion secondary battery |
| CN2833899Y (en) * | 2005-08-26 | 2006-11-01 | 周基平 | Lithium ion cell pole pieces and core |
| CN201616479U (en) * | 2009-11-16 | 2010-10-27 | 河南比得力高新能源科技有限公司 | Multi-electrode lug lithium ion battery |
| CN202050030U (en) * | 2011-05-20 | 2011-11-23 | 无锡市明杨电池有限公司 | Lithium ion battery with high-multiplying-power discharge performance |
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Patent Citations (5)
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| US20050084750A1 (en) * | 2003-09-01 | 2005-04-21 | Byd America Corporation | Lithium ion secondary battery |
| CN1540792A (en) * | 2003-10-31 | 2004-10-27 | 中信国安盟固利电源技术有限公司 | Method for making core of soft packaged lithium ion dynamic battery |
| CN2833899Y (en) * | 2005-08-26 | 2006-11-01 | 周基平 | Lithium ion cell pole pieces and core |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI462380B (en) * | 2011-12-20 | 2014-11-21 | Au Optronics Corp | Battery core and method of manufacturing the same |
| US9123924B2 (en) | 2011-12-20 | 2015-09-01 | Au Optronics Corporation | Battery core and method of manufacturing the same |
| CN102569711A (en) * | 2011-12-29 | 2012-07-11 | 曙鹏科技（深圳）有限公司 | Lithium ion battery and manufacturing method thereof |
| CN102569711B (en) * | 2011-12-29 | 2014-10-01 | 曙鹏科技（深圳）有限公司 | Lithium ion battery and manufacturing method thereof |
| CN103296245A (en) * | 2013-05-02 | 2013-09-11 | 浙江努奥罗新能源科技有限公司 | Cylinder lithium battery |
| CN106695184A (en) * | 2016-11-29 | 2017-05-24 | 中国电子科技集团公司第十八研究所 | Method for welding electrode lug of flexible package lithium ion battery |
| CN107768676A (en) * | 2017-09-05 | 2018-03-06 | 东莞市迈科新能源有限公司 | A kind of lithium ion battery and its pole piece |
| CN113661608A (en) * | 2020-12-22 | 2021-11-16 | 宁德新能源科技有限公司 | Electrochemical device and electricity utilization device |
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Application publication date: 20111026 |