CN102332613A - Reeling method of square lithium ion battery - Google Patents
Reeling method of square lithium ion battery Download PDFInfo
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- CN102332613A CN102332613A CN201010624415A CN201010624415A CN102332613A CN 102332613 A CN102332613 A CN 102332613A CN 201010624415 A CN201010624415 A CN 201010624415A CN 201010624415 A CN201010624415 A CN 201010624415A CN 102332613 A CN102332613 A CN 102332613A
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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 the technical field of lithium ion batteries, and especially relates to a reeling method of a square lithium ion battery. The method comprises the following steps: 1, successively overlying a positive plate with a tab arranged at an initial end, a barrier film, and a negative plate with a tab at an initial end to form reeling units; 2, successively overlying the reeling units, and aligning the positive tabs and the negative tabs on the reeling units; and 3, reeling the reeling units processed with step 1 and step 2 from the initial end to form electrical cores of the lithium ion battery. The method of the invention allows effects of accurate alignment of a plurality of tabs and high rate discharge to be realized.
Description
Technical field
The present invention relates to the lithium ion battery field, refer in particular to a kind of method for winding of rectangular lithium ion battery.
Technical background
The continuous development of electronic technology promotes various electronic products to miniaturization, lightweight development, like popularizing of mobile phone, card camera, miniature camera, notebook computer etc.And the miniaturization of electronic product must be accompanied by the miniaturization of power supply.Lithium ion battery is because of advantages such as energy density is high, average open-circuit voltage is high and have extended cycle life have been widely used in moving, portable electronics.Wherein, the square lithium ion secondary battery of takeup type structure, because its model is varied, can be according to the design adjustment size of electronic product, wide adaptability, and be widely used in every field.But the square lithium ion secondary battery of traditional winding-structure exists internal resistance bigger, deficiencies such as high-rate discharge ability difference.And after battery capacity improved, the both positive and negative polarity pole piece of battery was longer, and preparation and coiling difficulty are big.
Publication number is all to mention in the patent of CN1445879A and the patent that publication number is CN2845189Y through setting up the high-rate discharge ability that lug quantity on the both positive and negative polarity pole piece improves lithium rechargeable battery; But its shortcoming is these winding-structures and all has only an anode pole piece and a cathode pole piece, and winding process is that the end by pole piece begins to reel.When battery pole piece length is longer, in the winding process of battery between anode pole piece, cathode pole piece and the barrier film to bit comparison difficulty, the coiling difficulty increases with the growth of pole piece, and exists the coiling number of turns more, the problem that winding efficiency is not high.Simultaneously, because the needs that electronic product accurately assembles power supply module, square lithium ion secondary battery is increasingly high to the required precision of battery pole ear position.When using the pole piece coiling rectangular lithium ion battery of this multipole ear; A plurality of positive pole ears or a plurality of negative lug need the assessment of loaded down with trivial details calculating and test of many times just can calculate the position of each lug on pole piece with in the different layers that is distributed in multilaminate coiled structure respectively.But in the actual production, the tolerance that pole piece prepares equipment and pole piece coiling equipment is all inevitable, and artificial tolerance of reeling is bigger.These small tolerances all can be along with the increase of the pole piece length and the pole piece coiling number of turns by at double or become the amplification of the order of magnitude.Even atomic little deviation in the pole piece coiling process all possibly cause very big lug contraposition deviation.This just causes a plurality of lugs on the pole piece to be difficult in the accurately alignment of back of reeling, and is unfavorable for the following process manufacturing of battery, also brings problem for the accurate assembling of electronic product.
Though publication number is to mention the winding-structure that uses an anode pole piece to add two cathode pole pieces (or using a cathode pole piece to add two anode pole pieces) in the patent of CN1929186A; But its winding method is to reel since the centre of a pole piece; And the good pole piece that needs before reeling to superpose is folding more once, has increased operation.And when battery size and capacity increase, can run into the oversize problem of coiling pole piece equally, increase the contraposition difficulty between positive and negative electrode pole piece and the barrier film.And its method that pole piece welds a plurality of lugs mentioning, also can bring the problem of above-mentioned lug contraposition.These problems all can influence the efficient and the accurate control that aligns the negative lug position of battery winding.
Summary of the invention:
The objective of the invention is to deficiency, and a kind of method for winding of rectangular lithium ion battery is provided to prior art.
In order to realize the purpose of this law, adopt following technical scheme:
A kind of method for winding of rectangular lithium ion battery may further comprise the steps:
The negative plate that A, positive plate, barrier film and initial end that initial end is provided with lug the are provided with lug formation winder unit that superposes successively;
B, winder unit is superposeed successively, and alignment the positive and negative electrode lug on the winder unit that superposes;
C, the winder unit that will pass through step B are then begun to reel by initial end, form lithium ion battery cell.
Described winder unit is at least 2.
The lug of described positive plate lug, negative plate is measure-alike, and the length ratio of the width of lug and winder unit is 1: 50～100.
The lug of described positive plate lug, negative plate is measure-alike, and the length ratio of the width of lug and winder unit is 1: 65～75.
Beneficial effect of the present invention:
First; Rectangular lithium ion battery with the inventive method coiling; Owing to use the winder unit more than 2 or 2; Make the positive and negative plate that comprised in each winder unit and the length of barrier film all shorten at double, the corresponding coiling number of turns also can reduce at double, can increase substantially the winding efficiency of battery.When for example using 4 winder units, the length of each winder unit has only conventional roll around 1/4th of pole piece length, and the coiling number of turns also has only 1/4th of traditional winding method;
The second, owing to all only comprise a positive pole ear and a negative lug in each winder unit, before coiling; All positive and negative electrode lugs are alignment earlier; Behind the coiling, all lugs all are in the inner lane of battery winding-structure, and the relative position of all lugs in case fixing just can not change in winding process; The tolerance that coiling machine and coiling personnel are brought can not impact the degree of registration of lug; The lug of the battery that can guarantee to wind has very high regularity, helps improving the consistency of battery, is convenient to subsequent production and assembling;
The 3rd; Can confirm the quantity and the size of winder unit by battery size; The width of the both positive and negative polarity lug that is comprised in the winder unit and the length ratio of winder unit are 1: 50～100; Can when control battery pole piece length is convenient to reel, the internal resistance of battery significantly be reduced like this, guarantee the big multiplying power discharging property of battery;
The 4th, can use the accurately degree of registration of a plurality of both positive and negative polarity lugs of control of simpler method, be convenient to produce in batches, reduce the coiling number of turns of battery pole piece simultaneously at double, enhance productivity;
The 5th, the present invention is applicable to that various models hang down the square lithium ion secondary battery of internal resistance, high-discharge-rate.
Description of drawings:
Fig. 1 is the formation of battery winding of the present invention unit and stacks sketch map;
Fig. 2 is a battery winding structural representation of the present invention;
Fig. 3 is the multiplying power discharging property comparison diagram of the battery that makes of the present invention and traditional winding method.
Embodiment:
Embodiment 1:
Square lithium ion secondary battery with 606268 models (thickness of finished product battery is 6 millimeters, and width is 62 millimeters, and length is 68 millimeters) is an example.Present embodiment uses the winding-structure 4 of three winder units, sees Fig. 1-2.
With ternary material nickel manganese cobalt (LiNiMnCoO2), conductive black (Super-P) and Kynoar (PVDF) is to be dissolved in N-dimethyl pyrrolidone (NMP) at 95: 2: 3 stirring in proportion; And use NMP adjusting viscosity is 3000～5000MPas; Slurry is coated on the aluminium foil of 14um by driven dimension, makes anode pole piece 1.In the initial end of anode pole piece 1, the aluminium strip that width of ultrasonic bonding is 8mm is as positive pole ear 5.The position of soldering polar ear 5 is identical on all anode pole pieces 1.
With spherical graphite, butadiene-styrene rubber (SBR), sodium carboxymethylcellulose (CMC) and conductive black (Super-P) is 95.8: 1.8: 1.6 in proportion: 1 is dissolved in the deionized water; Stir; And use deionized water adjusting viscosity is 1000～2000MPas; Slurry is coated on the Copper Foil of 9um, makes cathode pole piece 2.In the initial end of cathode pole piece 2, the nickel strap that width of ultrasonic bonding is 8mm is as negative lug 6.The position of soldering polar ear 6 is identical on all cathode pole pieces 2.
Adopt method of the present invention, the negative plate 2 that positive plate 1, barrier film 3 and the initial end that respectively initial end is provided with positive pole ear 5 is provided with negative lug 6 superposes successively and forms winder unit 4 (see figure 1)s, forms three winder units 4 altogether.The length of winder unit 4 is 400mm, and the lug width is 1: 50 with the length ratio of winder unit 4.
The positive and negative electrode lug on all winder units 4 that align during stack superposes three winder units 4 by a graded again.Begin to reel from initial end, obtain battery through the winder unit 4 of above-mentioned steps.Subsequently, battery is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, through vacuumize, fluid injection, moulding changes into, and exhaust after the operations such as test capacity, is produced the finished product battery.
Embodiment 2:
Square lithium ion secondary battery with 606268 models (thickness of finished product battery is 6 millimeters, and width is 62 millimeters, and length is 68 millimeters) is an example.Present embodiment uses the winding-structure of three winder units, sees Fig. 1.
At first by preparing anode pole piece 1 and cathode pole piece 2 with embodiment 1 identical method.Both positive and negative polarity pole piece that embodiment 2 uses and the pole piece difference of embodiment 1 only are the length of pole piece.
In the initial end of anode pole piece 1, the aluminium strip that width of ultrasonic bonding is 6mm is as positive pole ear 5.The position of soldering polar ear 5 is identical on all anode pole pieces 1.In the initial end of cathode pole piece 2, the nickel strap that width of ultrasonic bonding is 6mm is as negative lug 6.The position of soldering polar ear 6 is identical on all cathode pole pieces 2.
Adopt method of the present invention, the negative plate 2 that positive plate 1, barrier film 3 and the initial end that respectively initial end is provided with positive pole ear 5 is provided with negative lug 6 superposes successively and forms winder unit 4 (see figure 1)s, forms three winder units 4 altogether.The length of winder unit 4 is 402mm, and the lug width is 1: 67 with the length ratio of winder unit 4.
Again three winder units 4 by graded stack, during stack alignment the positive and negative electrode lug on the winder unit that superposes 4.Begin to reel from initial end, obtain battery through the winder unit 4 of above-mentioned steps.Subsequently, battery is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, through vacuumize, fluid injection, moulding changes into, and exhaust after the operations such as test capacity, is produced the finished product battery.
Embodiment 3:
Square lithium ion secondary battery with 606268 models (thickness of finished product battery is 6 millimeters, and width is 62 millimeters, and length is 68 millimeters) is an example.Present embodiment uses the winding-structure of two winder units.
At first by preparing anode pole piece 1 and cathode pole piece 2 with embodiment 1 identical method.Both positive and negative polarity pole piece that embodiment 3 uses and the pole piece difference of embodiment 1 only are the length of pole piece.
In the initial end of anode pole piece 1, the aluminium strip that width of ultrasonic bonding is 7.5mm is as positive pole ear 5.The position of soldering polar ear 5 is identical on all anode pole pieces 1.In the initial end of cathode pole piece 2, the nickel strap that width of ultrasonic bonding is 7.5mm is as negative lug 6.The position of soldering polar ear 6 is identical on all cathode pole pieces 2.
Adopt method of the present invention, the negative plate 2 that positive plate 1, barrier film 3 and the initial end that respectively initial end is provided with positive pole ear 5 is provided with negative lug 6 superposes successively and forms winder unit 4 (see figure 1)s, forms two winder units 4 altogether.The length of winder unit 4 is 600mm, and the lug width is 1: 80 with the length ratio of winder unit 4.
Again two winder units 4 by graded stack, during stack alignment the positive and negative electrode lug on the winder unit that superposes 4.Begin to reel from initial end, obtain battery through the winder unit 4 of above-mentioned steps.Subsequently, battery is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, through vacuumize, fluid injection, moulding changes into, and exhaust after the operations such as test capacity, is produced the finished product battery.
Embodiment 4:
Square lithium ion secondary battery with 606268 models (thickness of finished product battery is 6 millimeters, and width is 62 millimeters, and length is 68 millimeters) is an example.Present embodiment uses the winding-structure of four winder units.
At first by preparing anode pole piece 1 and cathode pole piece 2 with embodiment 1 identical method.Both positive and negative polarity pole piece that embodiment 4 uses and the pole piece difference of embodiment 1 only are the length of pole piece.
In the initial end of anode pole piece 1, the aluminium strip that width of ultrasonic bonding is 3mm is as positive pole ear 5.The position of soldering polar ear 5 is identical on all anode pole pieces 1.In the initial end of cathode pole piece 2, the nickel strap that width of ultrasonic bonding is 3mm is as negative lug 6.The position of soldering polar ear 6 is identical on all cathode pole pieces 2.
Adopt method of the present invention, the negative plate 2 that positive plate 1, barrier film 3 and the initial end that respectively initial end is provided with positive pole ear 5 is provided with negative lug 6 superposes successively and forms winder unit 4 (see figure 1)s, forms four winder units 4 altogether.The length of winder unit 4 is 300mm, and the lug width is 1: 100 with the length ratio of winder unit 4.
Again four winder units 4 by graded stack, during stack alignment the positive and negative electrode lug on the winder unit that superposes 4.Begin to reel from initial end, obtain battery through the winder unit 4 of above-mentioned steps.Subsequently, battery is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, through vacuumize, fluid injection, moulding changes into, and exhaust after the operations such as test capacity, is produced the finished product battery.
Comparative Examples 1:
Square lithium ion secondary battery with 606268 models (thickness of finished product battery is 6 millimeters, and width is 62 millimeters, and length is 68 millimeters) is an example.Comparative Examples 1 is used the winding-structure of an anode pole piece, a cathode pole piece, wherein is welded with 1 positive pole ear on the anode pole piece, is welded with 1 negative lug on the cathode pole piece.
At first by preparing anode pole piece and cathode pole piece with embodiment 1 identical method.Both positive and negative polarity pole piece that Comparative Examples 1 is used and the pole piece difference of embodiment 1 only are the length of pole piece.Then, adopt traditional method for winding to reel.Subsequently, the battery of winding is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, warp goes out the finished product battery with the identical explained hereafter of embodiment.
Comparative Examples 2:
Square lithium ion secondary battery with 606268 models (thickness of finished product battery is 6 millimeters, and width is 62 millimeters, and length is 68 millimeters) is an example.Comparative Examples 2 is used the winding-structure of an anode pole piece, a cathode pole piece, wherein is welded with 3 positive pole ears on the anode pole piece, is welded with 3 negative lug on the cathode pole piece.
At first by preparing anode pole piece and cathode pole piece with embodiment 1 identical method.Both positive and negative polarity pole piece that Comparative Examples 2 is used and the pole piece difference of embodiment 1 only are the length of pole piece and the lug quantity on every pole piece.Then, adopt traditional method for winding to reel.Subsequently, the battery of winding is encapsulated in nylon-aluminium foil-three layers of package foil of polypropylene, warp goes out the finished product battery with the identical explained hereafter of embodiment.
All embodiment are identical with the finished product battery size that Comparative Examples is produced, and the positive and negative electrode prescription of employing is identical, and except that the winding-structure difference, other technological parameter is all identical.
Table 1 is the contrast of the battery coiling number of turns He all positive and negative electrode lug contraposition deviations of embodiment and Comparative Examples.Can find out that adopt the coiling number of turns of the battery of the winding method among the present invention obviously to reduce, the contraposition deviation of positive and negative electrode lug significantly reduces.
The contrast of the electric core winding number of turns of table 1 embodiment and Comparative Examples and lug contraposition deviation
Table 2 is quantity contrast forms of the foregoing description and Comparative Examples artificial battery that winds in 1 hour.Can find out, use method for winding of the present invention, can significantly improve the winding efficiency of battery.And winder unit is many more, and winding efficiency is high more.
The quantity contrast of table 2 embodiment and the Comparative Examples artificial battery that winds in 1 hour
| Embodiment 4 | 4 | 44～48 |
| Comparative Examples 1 | / | 20～23 |
| Comparative Examples 2 | / | 20～23 |
Table 3 is internal resistance contrasts (respectively getting the internal resistance mean value of 50 batteries) of the battery that makes of embodiment and Comparative Examples.Can find out, use method for winding of the present invention embodiment can with the internal resistance of Comparative Examples 2 the same remarkable reduction batteries.And the ratio of lug width and winder unit length is big more, and the internal resistance of battery reduces more.
The internal resistance of cell contrast table of table 3 embodiment and Comparative Examples
It is as shown in Figure 3 that two kinds of winding methods make the high-rate discharge ability contrast of battery.Can find out, compare with Comparative Examples 1, use method for winding of the present invention, can significantly improve the big multiplying power discharging property of battery, and the ratio of lug width and winder unit length is big more, the high-rate discharge ability of battery is good more.Compare with Comparative Examples 2, because the degree of registration of lug is higher, the internal resistance when multipole ear switching is welded is littler, makes the big multiplying power discharging property of battery better.
Need to prove that according to the announcement and the elaboration of above-mentioned specification, those skilled in the art in the invention can also change and revise above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should be in the protection range of claim of the present invention to equivalent modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (4)
1. the method for winding of a rectangular lithium ion battery is characterized in that: may further comprise the steps:
The negative plate that A, positive plate, barrier film and initial end that initial end is provided with lug the are provided with lug formation winder unit that superposes successively;
B, winder unit is superposeed successively, and alignment the positive and negative electrode lug on the winder unit that superposes;
C, the winder unit that will pass through step B are then begun to reel by initial end, form lithium ion battery cell.
2. the method for winding of a kind of rectangular lithium ion battery according to claim 1, it is characterized in that: described winder unit is at least 2.
3. the method for winding of a kind of rectangular lithium ion battery according to claim 1, it is characterized in that: the lug of described positive plate lug, negative plate is measure-alike, and the length ratio of the width of lug and winder unit is 1: 50～100.
4. the method for winding of a kind of rectangular lithium ion battery according to claim 3, it is characterized in that: the lug of described positive plate lug, negative plate is measure-alike, and the length ratio of the width of lug and winder unit is 1: 65～75.
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| CN201010624415A CN102332613A (en) | 2010-12-31 | 2010-12-31 | Reeling method of square lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010624415A CN102332613A (en) | 2010-12-31 | 2010-12-31 | Reeling method of square lithium ion battery |
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| CN102332613A true CN102332613A (en) | 2012-01-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109301339A (en) * | 2018-10-08 | 2019-02-01 | 东莞阿李自动化股份有限公司 | Electric core winding technique |
Citations (5)
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|---|---|---|---|---|
| CN2691069Y (en) * | 2004-04-23 | 2005-04-06 | 刘昌国 | Pole sheet group for lithium ion secondary cell |
| JP2006012813A (en) * | 2004-06-28 | 2006-01-12 | Samsung Sdi Co Ltd | Electrode assembly and lithium secondary battery using the same |
| CN101083342A (en) * | 2006-05-30 | 2007-12-05 | 深圳市比克电池有限公司 | Winding flexible packing lithium ionic cell unit, cell and process for production |
| US20080206628A1 (en) * | 2007-02-28 | 2008-08-28 | Hidetoshi Honbou | Lithium secondary battery |
| JP2010055790A (en) * | 2008-08-26 | 2010-03-11 | Nec Tokin Corp | Lithium ion secondary battery |
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2010
- 2010-12-31 CN CN201010624415A patent/CN102332613A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2691069Y (en) * | 2004-04-23 | 2005-04-06 | 刘昌国 | Pole sheet group for lithium ion secondary cell |
| JP2006012813A (en) * | 2004-06-28 | 2006-01-12 | Samsung Sdi Co Ltd | Electrode assembly and lithium secondary battery using the same |
| CN101083342A (en) * | 2006-05-30 | 2007-12-05 | 深圳市比克电池有限公司 | Winding flexible packing lithium ionic cell unit, cell and process for production |
| US20080206628A1 (en) * | 2007-02-28 | 2008-08-28 | Hidetoshi Honbou | Lithium secondary battery |
| JP2010055790A (en) * | 2008-08-26 | 2010-03-11 | Nec Tokin Corp | Lithium ion secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109301339A (en) * | 2018-10-08 | 2019-02-01 | 东莞阿李自动化股份有限公司 | Electric core winding technique |
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Application publication date: 20120125 |