CN101640286B - Core of spirally wound lithium battery and spirally wound lithium battery - Google Patents
Core of spirally wound lithium battery and spirally wound lithium battery Download PDFInfo
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- CN101640286B CN101640286B CN2008101353912A CN200810135391A CN101640286B CN 101640286 B CN101640286 B CN 101640286B CN 2008101353912 A CN2008101353912 A CN 2008101353912A CN 200810135391 A CN200810135391 A CN 200810135391A CN 101640286 B CN101640286 B CN 101640286B
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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 core of a spirally wound lithium battery, which comprises a positive plate, a diaphragm and a negative plate; a positive lug is integrally formed at the winding tail end of the positive plate; a negative lug is integrally formed at the winding tail end of the negative plate; and the positive lug and the negative lug are formed on an upper side and a lower side of the core respectively and are positioned on both sides of the core. The core is easy to manufacture and assemble into the battery, has wide and thin integral lugs so as to form relative large current conduction area, and has good high-rate discharge performance and cooling performance.
Description
Technical field
The present invention relates to lithium battery, relate in particular to a kind of electric core of coiling type lithium battery, and the coiling type lithium battery with this electricity core.
Background technology
Lithium battery is widely used in numerous areas, particularly mobile phone, electron trade because of its operating voltage height, outstanding feature such as specific energy is big, self discharge is little.Structure, performance and manufacturing process at lithium battery are also updated.Along with the continuous development of lithium battery applications, auto industry also lithium battery is provided provide power gradually.At present, the structure of lithium battery mainly contains stacked and takeup type.What the present invention relates to is coiling type lithium battery.
The electric core of coiling type lithium battery comprises positive plate, negative plate, barrier film, anode ear and negative electrode lug at present.The type of lug comprises positive and negative lug is welded on the allosome lug that forms on the positive and negative plate respectively and extends that obtain and the lug pole piece one by pole piece.Because the allosome lug is not easy to reel and increased to a great extent internal resistance, the lug that forms one with pole piece has obtained more concern.
China's CN2909544Y patent " a kind of convoluted electric core structure of lithium battery " discloses a kind of one lug, but this lug obtains electric core winding after well by Punching Technology, and electric core adopts traditional method for winding to obtain being positioned at the positive and negative lug of the same side of electric core.Because positive and negative lug is positioned at the same side of electric core, well punching out later lug at electric core winding just needs die-cut positive and negative plate respectively, and this not only causes the assembly difficulty of battery to increase, and also exists the direct contact of positive and negative lug to cause the possibility of short circuit.And the lug that obtains by die-cut pole piece can cause the width of the width of lug less than positive and negative plate, has also just reduced the current lead-through area of lug, and the heat dispersion of battery and the high-rate discharge ability of battery are relatively poor.
In addition because vehicle needs serial or parallel connection so that enough power to be provided with electrokinetic cell, this just need the good discharge performance of battery and between be convenient to connect.The positive pole of present most of coiling type lithium batteries and negative pole all are positioned at the homonymy of battery, have caused the connection inconvenience of series and parallel between the battery, for follow-up automobile circuit integral installation wears inconvenience.
Summary of the invention
For being positioned at homonymy, lug after overcoming the one lug and reeling causes following process, problems such as assembly manipulation complexity and lug die-cut back battery heat dispersion and high-rate discharge ability difference, one aspect of the present invention provides a kind of electric core of coiling type lithium battery, this electricity core comprises positive plate stacked successively and that reel, barrier film and negative plate, the terminal integrally formed anode ear of the coiling of described positive plate, the terminal integrally formed negative electrode lug of the coiling of described negative plate, wherein, described anode ear and negative electrode lug are formed at the upper and lower surface of described electric core respectively and are positioned at the both sides of described electric core.
Described lug is formed on the both sides of described electric core, does not have the directly problem of contact of positive and negative lug, does not also need follow-up other similar die-cut machining.Be convenient to the connection between the battery and be convenient to be assemblied in suitable occasion.And described electric core has the lug identical with material, width and the thickness of pole piece, has increased the current lead-through area relatively, has improved high-rate discharge ability.
In order to obtain electric core of the present invention, second aspect of the present invention provides a kind of preparation method of described electric core, and this method may further comprise the steps:
Positive plate and negative plate are provided, except the end of reeling, be coated with positive electrode on the described positive plate, be coated with negative material on the described negative plate except the end of reeling, the described coiling end of described positive plate and negative plate is respectively applied for and forms anode ear and negative electrode lug;
Positive plate is placed between the barrier film, will roll up the both sides up and down that pin is interposed in the coiling head end of described positive plate then;
Negative plate is overlayed the upside of described barrier film, and the coiling head end of described negative plate is placed in abutting connection with the edge side of described volume pin;
Positive plate, barrier film and the negative plate that utilizes described volume pin successively to reel to stack is to form the electric core of lithium battery, make the coiling end of described positive plate stretch out and form anode ear from the upper surface of electric core, the coiling end of described negative plate stretches out and forms negative electrode lug from the lower surface of electric core, and described anode ear and negative electrode lug are formed at the both sides of described electric core respectively.
The method of the electric core of described preparation is simple, rate of finished products height, and the accurate positioning of described lug, and the positive and negative lug position of the described electric core that obtains is relative, can change relative position according to operating position.
Be positioned at the assembling complexity that the battery homonymy causes and the problem of high-rate discharge ability difference for solving the positive and negative lug of existing coiling type lithium battery, according to a third aspect of the present invention, provide a kind of coiling type lithium battery.Described battery comprises electric core, nonaqueous electrolytic solution and battery container, this electricity core comprises positive plate, barrier film and negative plate stacked successively and that reel, the terminal integrally formed anode ear of the coiling of described positive plate, the terminal integrally formed negative electrode lug of the coiling of described negative plate, described electric core is sealed in the described battery container, wherein, described anode ear and negative electrode lug are formed at the upper and lower surface of described electric core respectively and are positioned at the both sides of described electric core, and described anode ear and negative electrode lug are connected respectively on the cover plate at described battery container two ends.
Coiling type lithium battery according to the present invention has the lug with the pole piece one, and described lug is positioned at the both sides of battery, therefore the battery the two poles of the earth that assemble also are positioned at the both sides of battery, thereby make things convenient for the serial or parallel connection between the battery, and then be convenient to install in use occasion, especially simplified assembling as automobile power cell.Described lug is identical with material, width and the thickness of pole piece, has just obtained relatively large current lead-through area, has improved coiling type lithium battery high-rate discharge ability and heat dispersion, makes described coiling type lithium battery more be applicable to electrokinetic cell.Lithium battery according to the present invention has the lug that is formed on the battery both sides, makes the assembling of battery simple, and has avoided the direct contact of positive and negative electrode to cause risk of short-circuits, and the fabrication yield height, and is aesthetic in appearance.
Description of drawings
Fig. 1 is the structure chart according to electric core of the present invention;
Fig. 2 is the structure chart according to electric core winding head end of the present invention;
Fig. 3 is the structural representation according to battery of the present invention;
Fig. 4 is the lithium battery discharge capacity of the present invention that obtains by high-multiplying power discharge test and the graph of a relation of multiplying power.
Embodiment
Fig. 1 shows is structure according to electric core of the present invention, and described electric core 10 comprises positive plate 14, negative plate 15, barrier film 13, anode ear 11 and negative electrode lug 12.Wherein, pole piece and barrier film are band shape, positive and negative plate has been coated with polarity dressing and has formed on positive and negative collector, barrier film 13 is used for insulation ground and separates positive and negative plate, and together reels with described positive and negative plate and to form described electric core, and described lug is connected the end of described pole piece coiling, described lug is the part of the terminal uncoated polarity dressing of collector, the extension of described collector just, therefore described lug is the collector lug, with pole piece be one.Particularly, the terminal integrally formed anode ear 11 of the coiling of positive plate 14, the terminal integrally formed negative electrode lug 12 of the coiling of described negative plate 15, wherein, negative electrode lug 12 and anode ear 11 are formed at the upper and lower surface of described electric core respectively and are positioned at the both sides of described electric core, have avoided the directly possibility of contact of positive and negative lug.And described lug does not need follow-up similar die-cut machining, and the width of anode ear and the negative electrode lug width with positive plate and negative plate respectively is identical.Because described lug is identical with material, width and the thickness of described pole piece, thereby has relatively large current lead-through area, makes described electric core have good performance of heat dissipation and high-rate discharge ability.
Can obtain described core strueture according to method provided by the invention.Particularly, positive plate 14 and negative plate 15 are provided, except the end of reeling, be coated with positive electrode on the described positive plate, be coated with negative material on the described negative plate except the end of reeling, the described coiling end of described positive plate and negative plate is respectively applied for and forms anode ear 11 and negative electrode lug 12; Positive plate 14 is placed between the barrier film 13, will roll up the both sides up and down that pin 18 is folded in the coiling head end of described positive plate then; Negative plate 15 is overlayed the upside of described barrier film 13, and the coiling head end of described negative plate 15 is placed in abutting connection with the edge side of described volume pin 18; Positive plate 14, barrier film 13 and the negative plate 15 that utilizes described volume pin 18 successively to reel to stack is to form the electric core of lithium battery, make the coiling end of described positive plate 14 stretch out and form anode ear 11 from the lower surface of electric core, the coiling end of described negative plate 15 stretches out and forms negative electrode lug 12 from the upper surface of electric core, and described anode ear 12 and negative electrode lug 11 are formed at the both sides of described electric core respectively.
Wherein, removing coiling head end and last one deck, is that positive and negative plate and two barrier films have four coilings together altogether in the winding process, that is to say that every layer comprises positive and negative plate and two barrier films.Can be as required with described pole piece and square, the cylindrical or flat cylindricality of membrane coil coiled.As shown in Figure 1, roll up the flat cylindricality electricity core that pin is reeled along clockwise direction and obtained.When being wound to last one deck, stop the coiling of positive and negative plate respectively, as shown in Figure 1, volume is during to last one deck, stops winding positive electrode sheet at the downside of described electric core, makes anode ear 11 be formed on the downside of electric core 10; Continue coiling negative plate 15 and make its upside that terminates in described electric core, at the upside formation negative electrode lug 12 of electric core 10.Thus, obtained being formed on the collector lug of described electric core both sides.In the present embodiment, be the folded end that the initiating terminal of positive plate 14 is sandwiched barrier film 13,, also negative plate can be sandwiched the folded end of described barrier film according to method provided by the invention.In addition, the position that finally forms positive and negative lug also is relative, the front and back order that depends on coiling direction up and down and stop reeling of its position.
The central axis that need guarantee positive plate 14, negative plate 15 and barrier film 13 during coiling is parallel all the time, and guarantees that the tensioning dynamics of described pole piece and barrier film is consistent.Particularly, can fix the folded end of described barrier film with insulating tape, the tensioning dynamics unanimity when reeling with convenient assurance.Thereby can obtain the lug of accurate positioning.
The electric core that will obtain by said method is axially extracted along volume pin 18, and with the fixing outermost knee of insulating tape, can be assembled into coiling type lithium battery of the present invention.According to the difference of described electric core shape, coiling type lithium battery of the present invention also can be square, cylindrical or flat cylindricality.The structure of coiling type lithium battery of the present invention as shown in Figure 3, described coiling type lithium battery comprise electric core 10, nonaqueous electrolytic solution and battery container 20.Wherein, electricity core 10 is an electric core provided by the invention, have the both sides that are formed on the upper and lower surface of described electric core with the lug of pole piece one and described lug and are positioned at described electric core, as shown in Figure 3, anode ear 11 is formed on the following right side of face of described electric core 10, and negative electrode lug 12 is formed on the last left side of face of described electric core, and has formed the lug identical with pole piece material, width and thickness, just obtained wide and thin lug, made described battery have bigger current lead-through area.Described electric core 10 is connected with cover plate on the battery container 20 by lug and soaks in nonaqueous electrolytic solution, is sealed in the battery container 20.Particularly, wherein said lug connects with the employing welding manner that is connected of the cover plate of battery container 20, as connecting with the ultrasonic spot welding mode.
Positive pole and negative pole according to coiling type lithium battery of the present invention are positioned at the battery both sides, the convenient use is suitable for the assembling of the equipment of compact conformation, especially is suitable for automobile power cell, the positive and negative electrode that is positioned at both sides is convenient to the serial or parallel connection of a plurality of batteries, has simplified the assembly technology of automobile component.And coiling type lithium battery of the present invention has wide and thin relatively one lug, thereby has good relatively high-rate discharge ability, makes lithium battery more be applicable to electrokinetic cell.
For verifying the superior function of coiling type lithium battery of the present invention, the technical parameter of main reference is a high-rate discharge ability.(maximum charging and discharging currents is 150A, and voltage range 0～5V) is carried out the discharge performance test under different multiplying, and coiled battery capacity of the present invention is 10Ah, and measurement result as shown in Figure 4 by using detecting box BK-7012L/150.As can be seen from Figure 4, coiling type lithium battery discharge capacity of the present invention is stable, and especially when high-multiplying power discharge discharge capacity still kept very high percentage.
Claims (2)
1. the preparation method of the electric core of a coiling type lithium battery, this method may further comprise the steps:
Positive plate and negative plate are provided, except the end of reeling, be coated with positive electrode on the described positive plate, be coated with negative material on the described negative plate except the end of reeling, the described coiling end of described positive plate and negative plate is respectively applied for and forms anode ear and negative electrode lug;
Positive plate is placed between the barrier film, will roll up the both sides up and down that pin is interposed in the coiling head end of described positive plate then;
Negative plate is overlayed the upside of described barrier film, and the coiling head end of described negative plate is placed in abutting connection with the edge side of described volume pin;
Positive plate, barrier film and the negative plate that utilizes described volume pin successively to reel to stack is to form the electric core of lithium battery, make the coiling end of described positive plate stretch out and form anode ear from the lower surface of electric core, the coiling end of described negative plate stretches out and forms negative electrode lug from the upper surface of electric core, and described anode ear and negative electrode lug are formed at the both sides of described electric core respectively.
2. the preparation method of electric core according to claim 1 is characterized in that, the width of described anode ear and the negative electrode lug width with positive plate and negative plate respectively is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101353912A CN101640286B (en) | 2008-08-01 | 2008-08-01 | Core of spirally wound lithium battery and spirally wound lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008101353912A CN101640286B (en) | 2008-08-01 | 2008-08-01 | Core of spirally wound lithium battery and spirally wound lithium battery |
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| CN101640286A CN101640286A (en) | 2010-02-03 |
| CN101640286B true CN101640286B (en) | 2011-12-07 |
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| CN102760911B (en) * | 2011-04-27 | 2015-03-11 | 黄祥盛 | Preparation method of novel high-capacity cylindrical battery cell |
| CN102738418B (en) * | 2012-06-30 | 2015-08-12 | 惠州亿纬锂能股份有限公司 | Square lithium-ferrous disulfide battery and preparation method thereof |
| CN106876169A (en) * | 2015-12-13 | 2017-06-20 | 中国科学院大连化学物理研究所 | A kind of lithium ion super capacitor core arrangement |
| CN206040883U (en) * | 2016-09-22 | 2017-03-22 | 宁德新能源科技有限公司 | Winding - type batteries |
| CN106384839A (en) * | 2016-10-27 | 2017-02-08 | 惠州亿纬锂能股份有限公司 | Winding type L-shaped soft package battery and preparation method thereof |
| CN108123090B (en) * | 2016-11-30 | 2021-02-19 | 宝山钢铁股份有限公司 | Outer tab with protection and battery thereof |
| CN108258294A (en) * | 2017-12-27 | 2018-07-06 | 深圳瑞隆新能源科技有限公司 | A kind of takeup type battery core, electric core winding method and coiled battery |
| CN109244526A (en) * | 2018-11-14 | 2019-01-18 | 江苏万达新能源科技股份有限公司 | A kind of novel battery |
| CN109378480A (en) * | 2018-12-05 | 2019-02-22 | 珠海光宇电池有限公司 | A kind of lithium ion battery |
| CN109378436A (en) * | 2018-12-05 | 2019-02-22 | 珠海光宇电池有限公司 | Tab and the lithium ion battery for using the tab |
| CN109461883A (en) * | 2018-12-05 | 2019-03-12 | 珠海光宇电池有限公司 | Lithium ion battery |
| CN110289451A (en) * | 2019-07-03 | 2019-09-27 | 惠州市金芯科技有限公司 | A kind of button lithium battery and preparation method thereof |
| CN110783638B (en) * | 2019-09-23 | 2022-10-11 | 合肥国轩高科动力能源有限公司 | Winding stacked battery cell and preparation method thereof |
| CN113795939A (en) * | 2020-03-31 | 2021-12-14 | 宁德新能源科技有限公司 | Electrode assembly and battery cell |
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