CN103500844A - Cylindrical multi-lug lithium ion battery and preparation method thereof - Google Patents

Cylindrical multi-lug lithium ion battery and preparation method thereof Download PDF

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Publication number
CN103500844A
CN103500844A CN201310394151.5A CN201310394151A CN103500844A CN 103500844 A CN103500844 A CN 103500844A CN 201310394151 A CN201310394151 A CN 201310394151A CN 103500844 A CN103500844 A CN 103500844A
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China
Prior art keywords
cover plate
ion battery
lithium ion
lugs
negative
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CN201310394151.5A
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Chinese (zh)
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CN103500844B (en
Inventor
张玉花
张文魁
梁文明
叶张军
吴志川
李勇
张兢
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ZHEJIANG JINKAILAI NEW ENERGY TECHNOLOGY Co Ltd
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ZHEJIANG JINKAILAI NEW ENERGY TECHNOLOGY Co Ltd
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Publication of CN103500844A publication Critical patent/CN103500844A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/543Terminals
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention discloses a cylindrical multi-lug lithium ion battery and a preparation method thereof. The lithium ion battery comprises a cylindrical housing, a positive-electrode cover plate, a negative-electrode cover plate, a battery core wound body, and electrolyte. A protruding platform extending into the inner part of the cylindrical housing is provided on the negative-electrode cover plate. The battery core wound body is prepared by winding by using a positive-electrode sheet, a separation sheet, and a negative-electrode sheet. A plurality of lugs are arranged on the positive-electrode sheet and the negative-electrode sheet. The electrolyte is filled in the cylindrical housing. The plurality of lugs on the negative-electrode sheet extend to the center of the battery core wound body and are connected on the protruding platform. With the design structure, the plurality of lugs on the negative-electrode sheet are directly arranged on the protruding platform through a welding point, such that battery performance consistency and manufacturing yield are improved, internal space of the battery is saved, battery design capacity is improved, and cost is reduced. With the preparation process, no large-scale instrument and equipment is needed, and operation is simple. The method is suitable for automation transformation of production lines.

Description

Cylinder multi-pole lug lithium ion battery and preparation method thereof
Technical field
The present invention relates to technical field of lithium ion, in particular to a kind of cylinder multi-pole lug lithium ion battery and preparation method thereof.
Background technology
Lithium ion battery especially adopt LiFePO4 as the lithium ion battery of positive active material have specific power high, have extended cycle life, security performance is good and the advantage such as pollution-free, is the critical product that determines that can current electric automobile, hybrid-electric car fast-developing.In a series of lithium ion battery products, cylindrical aluminium alloy shell battery receives much concern, and the profile that it is special and material make the overall dimension of product highly stable, and heavy-current discharge performance is more excellent, security performance is higher, the shell antiseptic property obviously improves.
Manufacturing process for cylindrical aluminium alloy shell battery has a variety of at present, but how battery structure optimization is improved to properties is a difficult problem that perplexs at present people always, if any the optimal way of employing multi pole ears structure, by adopting the multi pole ears structure, when high-multiplying power discharge, because battery core has a plurality of lugs, electron propagation ducts increases greatly, current density reduces, greatly reduced polarization, can reduce the internal resistance of cell, improve lithium ion battery discharge performance and security performance, make it more be applicable to being applied in electric automobile, electronic toy, the power supply such as the model of an airplane and electric tool aspect.
But, owing to thering are a plurality of extreme ear structures, for the welding of lug, be a difficult problem always.As shown in Figure 1 existing, multi pole ears is welded on to collecting ring a ' upper, be provided with water conservancy diversion leader tape b ' on collecting ring a ', then water conservancy diversion leader tape b ' is welded on the negative pole cover plate.But there are many defects in the method:
1) employee quality is larger on the properties of product impact.Because a large amount of lugs need to be welded on collecting ring by manual operations, cause that fracture appears in the part lug if operate unskilled meeting, cause the current capacity difference of lug, end reaction is that consistency is difficult to improve on battery performance.
2) collecting ring welding difficulty is large.Because a large amount of lugs are unordered arranging, collecting ring can only be that circle just can be taken into account all lugs.But there is a radian in circular collecting ring, the soldering tip of ultrasonic bonding and base all need to arrange the radian coupling of certain radian and collecting ring, have the welding manner of radian large to the soldering tip loss, and welding effect are poor, easily produce rosin joint, the problems such as sealing-off and solder skip.
3) welding procedure complexity.This mode need to be by a large amount of tab weldings on collecting ring, and an end of water conservancy diversion leader tape is welded on collecting ring, and the other end welds on the cover board.Because multiple welding all needs manual operations, complex process, make processing procedure control more difficult.
4) manufacturing cost is higher.This structure also needs to buy collecting ring accessory and the material and facilities such as water conservancy diversion leader tape and supersonic welder of Specialty Design, has increased cost of manufacture and fabrication processing.
5) affect the capacity of battery.In cylindrical battery design, collecting ring and water conservancy diversion leader tape need to take a large amount of inner spaces, and the width of battery pole piece will be reduced in the space taken on the cell height direction, then reduction by a relatively large margin the design capacity of battery.
Visible, current project organization exists that manufacturing cost is high, the battery design capacity is little, consistency of performance is poor and the defect such as conforming product rate is low, then affect battery in groups after life-span of battery pack.Therefore, at present urgently wish to occur that a kind of structure of suitable lithium ion battery is to substitute current project organization.
Summary of the invention
The present invention aims to provide a kind of cylinder multi-pole lug lithium ion battery and preparation method thereof, to solve the technical problem that the design capacity existed in existing lithium ion battery structure is little and consistency is poor.
To achieve these goals, according to an aspect of the present invention, provide a kind of cylinder multi-pole lug lithium ion battery, having comprised: cylinder shell; Anodal cover plate and negative pole cover plate, have on the negative pole cover plate to the inner protrusion platform extended of cylinder shell; Electrical core coiling body, be positioned at cylinder shell, and electrical core coiling body is reeled and formed by positive plate, barrier film and negative plate, is equipped with a plurality of lugs on positive plate and negative plate; And electrolyte, be filled in cylinder shell; Wherein, a plurality of lugs that are positioned on negative plate extend to the electrical core coiling body center and are connected on the protrusion platform.
Further, being connected to a plurality of lugs that protrude on platform overlaps.
Further, protruding platform and negative pole cover plate rivets fixing.
Further, ion battery also comprises the insulation spacer be arranged between protrusion platform and negative pole cover plate.
Further, anodal cover plate has opening, and a plurality of lugs that are positioned at the positive plate end pass opening and stretch along all epitaxial lateral overgrowths of opening.
Further, all sides of opening are provided with location notch, and described anodal cover plate also comprises the seal cover be used in conjunction with location notch.
Further, a plurality of tab weldings are protruding on platform.
Further, be welded as stored energy welding.
Further, between cylinder shell and anodal cover plate, between cylinder shell and negative pole cover plate, by laser welding, form hermetically-sealed construction.
According to a further aspect in the invention, a kind of preparation method of cylinder multi-pole lug lithium ion battery is provided, comprise that preparation has the positive plate of a plurality of lugs, the negative pole cover plate that has the negative plate of a plurality of lugs and have projecting platform, directly is welded on a plurality of lugs of negative plate end on projecting platform.
The present invention has abandoned the structure also by the water conservancy diversion leader tape, collecting ring is connected with the negative pole cover plate on collecting ring that first a plurality of lugs on negative plate is arranged on used in the prior art, but a plurality of lugs on negative plate are set directly at and protrude on platform by a pad, consistency and the row yielding of battery performance have not only been improved, and the space of having saved inside battery, improve the design capacity of battery, reduced cost.This preparation technology does not need large-scale instrument and equipment, simple to operate, is convenient to the automatic improving of production line.
The accompanying drawing explanation
The Figure of description that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:
Fig. 1 shows adopted collecting ring of the prior art and the syndeton schematic diagram of water conservancy diversion leader tape;
Fig. 2 shows the structural representation of the negative pole cover plate of the exemplary embodiments according to the present invention;
Fig. 3 shows the front view of the cylinder multi-pole lug lithium ion battery of the exemplary embodiments according to the present invention;
Fig. 4 shows the structural representation of anodal cover plate of the cylinder multi-pole lug lithium ion battery of the exemplary embodiments according to the present invention.
Embodiment
It should be noted that, in the situation that do not conflict, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.
In order to solve in prior art complex process and the poor problem of battery performance consistency that collecting ring is set and causes, the invention provides a kind of cylinder multi-pole lug lithium ion battery, as shown in Figures 2 and 3, this lithium ion battery comprises: cylinder shell 10, anodal cover plate 20 and negative pole cover plate 30, electrical core coiling body 40 and the electrolyte that is filled in cylinder shell 10 inside.Wherein on negative pole cover plate 30, have to the inner protrusion platform 31 extended of cylinder shell 10; Electrical core coiling body 40 is arranged in cylinder shell 10, this electrical core coiling body 40 is reeled and is formed by positive plate, barrier film and negative plate, wherein on positive plate and negative plate, be equipped with a plurality of lugs 41, a plurality of lugs 41 that are positioned on negative plate extend to electrical core coiling body 40 centers and are connected on protrusion platform 31.
The present invention has abandoned the structure also by the water conservancy diversion leader tape, collecting ring is connected with negative pole cover plate 30 on collecting ring that first a plurality of lugs 41 on negative plate is arranged on used in the prior art, but a plurality of lugs 41 on negative plate are set directly at and protrude on platform 31 by a pad, consistency and the row yielding of battery performance have not only been improved, and the space of having saved inside battery, improve the design capacity of battery, reduced cost.This preparation technology does not need large-scale instrument and equipment, simple to operate, is convenient to the automatic improving of production line.
Electrical core coiling body 40 of the present invention is to be reeled and formed by positive plate, barrier film and negative plate, and this preparation method is the conventional lug 41 general skewness on the formed electrical core coiling body 40 of reeling that is positioned at positive plate and negative plate end.More excellent for the battery performance that makes making, preferably, the present invention makes a plurality of lugs 41 that form after electrical core coiling body 40 be evenly distributed on positive plate or negative plate by design.
According to a kind of exemplary embodiment of the present invention, be connected to a plurality of lugs 41 that protrude on platform 31 and overlap.As shown in Figures 2 and 3, one end of lug 41 is connected with negative plate, the other end is overlapping on protrusion platform 31, this set-up mode makes all lugs 41 that are positioned on negative plate form the overlapping point of lug at the end be connected with protrusion platform 31, the overlapping point of this lug is connected with protrusion platform 31, between a plurality of like this lugs 41 and protrusion platform 31, a tie point is just only arranged, avoided a plurality of lugs 41 in the prior art to be connected to form with collecting ring the problem that a plurality of tie points cause the contact resistance inequality, this set-up mode has reduced time and the link of manual contact battery core simultaneously, obtained the lithium ion battery of consistency of performance excellence.
In order to make lithium ion battery structure firmer, protrude platform 31 fixing with 30 riveted joints of negative pole cover plate.The present invention preferably but be not limited to aforesaid way, also can adopt injection mo(u)lding to form protrusion platform 31 on negative pole cover plate 30.For negative pole is insulated with anodal, lithium ion battery of the present invention also comprises the insulation spacer 50 be arranged between protrusion platform 31 and negative pole cover plate 30.The present invention preferably adopts rivet that negative pole cover plate 30 and insulation spacer riveted joint is fixing, and rivet protrudes from the part formation protrusion platform 31 of negative pole cover plate 30 like this, for fixing of a plurality of lugs 41.
As shown in Figure 4, anodal cover plate 20 is provided with opening 21, and a plurality of lugs 41 that are positioned at the positive plate end pass opening 21 and stretch along all epitaxial lateral overgrowths of opening 21.Electrolyte is filled into cylinder shell 10 by the opening 21 be positioned on anodal cover plate 20, in all sides of opening, is provided with location notch 22, and this positive pole cover plate 20 also comprises the seal cover 23 be used in conjunction with location notch 22.The present invention is welded on anodal cover plate 20 after preferably a plurality of lugs 41 being drawn by the opening 21 of anodal cover plate 20, sealing after then engaging with location notch 22 with seal cover 23 sealings, and after sealing, the end face of seal cover 23 is mutually concordant with the end face of anodal cover plate 20.
According to a further aspect in the invention, a kind of preparation method of cylinder multi-pole lug lithium ion battery is provided, comprise and prepare the positive plate with a plurality of lugs 41, the negative plate with a plurality of lugs 41, negative pole cover plate 30 with projecting platform 31, directly be welded on a plurality of lugs 41 of positive plate end on projecting platform 31.
Wherein can adopt existing conventional method that lug 41 is connected to and protrudes on platform 31, the present invention preferably adopts the mode of welding, further preferably, of the present inventionly is welded as stored energy welding.Stored energy welding be charge storage in the electric capacity of certain capacity, make welding torch by the high-frequency pulse electric discharge with per second 2-3 time of wlding and workpiece moment, thereby make wlding and workpiece reach a kind of solder technology of metallurgical binding at moment contact point position.
Prior art mainly adopts ultrasonic bonding and two kinds of modes of laser welding, during as available technology adopting collecting ring technique, a plurality of lugs 41 are to be connected on the edge of collecting ring by supersonic welding, one end of water conservancy diversion leader tape is also to adopt supersonic welding to be connected on collecting ring, and the other end of water conservancy diversion leader tape can be by ultrasonic bonding or laser welding on anodal cover plate 20 or negative pole cover plate 30.But adopt laser welding can produce splashing of residue of aluminum, make battery core inside bring pollutant into.And stored energy welding has the not available advantage of ultrasonic bonding: 1) can not produce large tracts of land high temperature: because the form of stored energy welding welding is to form the welding process of face by spot welding, so maximum advantage be for some can not adopt high-temperature soldering, the local hard defects of the workpiece of To Be Protected from Heat distortion annealing can repair; 2) pad can reach metallurgical binding: the welding torch of stored energy welding welding can reach 1000 ℃ by instantaneous temperature between wlding and workpiece, can make pad reach the effect of metallurgical binding, make welding more firm, more reliable than ultrasonic bonding of the prior art or laser welding.
Welding process of the present invention is roughly as follows: at first electrical core coiling body 40 is put into to cylinder shell 10, center bending by all lugs 41 of negative plate end towards electrical core coiling body 40, lug 41 forms the overlapping point of lug on the protrusion platform 31 of negative pole cover plate 30 like this, then the capillary of stored energy welding (being generally red copper) is stretched into from the central opening 21 of the anodal cover plate 20 of electrical core coiling body 40, the overlapping point of lug of negative pole end is lived on the capillary crown, electrical core coiling body is vertically placed and carried out the energy storage welding, the center of the protrusion platform 31 of the overlapping point of lug and negative pole cover plate 30 is welded together.Wherein, the position of welding will guarantee accurately, can realize by suitable frock clamp.
Between cylinder shell 10 of the present invention and anodal cover plate 20, between cylinder shell 10 and negative pole cover plate 30, by laser welding, form hermetically-sealed construction.
As can be seen from the above description, the above embodiments of the present invention have realized following technique effect:
The present invention has abandoned the structure also by the water conservancy diversion leader tape, collecting ring is connected with the negative pole cover plate on collecting ring that first a plurality of lugs on negative plate is arranged on used in the prior art, but a plurality of lugs on negative plate are set directly at and protrude on platform by a pad, consistency and the row yielding of battery performance have not only been improved, and the space of having saved inside battery, improve the design capacity of battery, reduced cost.This preparation technology does not need large-scale instrument and equipment, simple to operate, is convenient to the automatic improving of production line.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a cylinder multi-pole lug lithium ion battery, is characterized in that, comprising:
Cylinder shell (10);
Anodal cover plate (20) and negative pole cover plate (30), have on described negative pole cover plate (30) to the inner protrusion platform (31) extended of described cylinder shell (10);
Electrical core coiling body (40), be positioned at described cylinder shell (10), and described electrical core coiling body (40) is reeled and formed by positive plate, barrier film and negative plate, is equipped with a plurality of lugs (41) on described positive plate and described negative plate; And
Electrolyte, be filled in described cylinder shell (10); Wherein,
The described a plurality of lugs (41) that are positioned on described negative plate extend and are connected on described protrusion platform (31) to described electrical core coiling body (40) center.
2. lithium ion battery according to claim 1, is characterized in that, the described a plurality of lugs (41) that are connected on described protrusion platform (31) overlap.
3. lithium ion battery according to claim 1, is characterized in that, described protrusion platform (31) is fixing with described negative pole cover plate (30) riveted joint.
4. lithium ion battery according to claim 3, is characterized in that, described ion battery also comprises the insulation spacer (50) be arranged between described protrusion platform (31) and described negative pole cover plate (30).
5. lithium ion battery according to claim 1, it is characterized in that, described anodal cover plate (20) has opening (21), and the described a plurality of lugs (41) that are positioned at described positive plate end pass described opening (21) and stretch along all epitaxial lateral overgrowths of described opening (21).
6. lithium ion battery according to claim 5, is characterized in that, all sides of described opening (21) are provided with location notch (22), and described anodal cover plate (20) also comprises the seal cover (23) be used in conjunction with described location notch (22).
7. lithium ion battery according to claim 1, is characterized in that, described a plurality of lugs (41) are welded on described protrusion platform (31).
8. lithium ion battery according to claim 7, is characterized in that, describedly is welded as stored energy welding.
9. lithium ion battery according to claim 1, is characterized in that, between described cylinder shell (10) and described anodal cover plate (20), between described cylinder shell (10) and described negative pole cover plate (30), by laser welding, form hermetically-sealed construction.
10. the preparation method of a cylinder multi-pole lug lithium ion battery, comprise that preparation has the positive plate of a plurality of lugs, the negative pole cover plate (30) that has the negative plate of a plurality of lugs and have projecting platform (31), it is characterized in that, described a plurality of lugs (41) of described negative plate end directly are welded on described projecting platform (31).
CN201310394151.5A 2013-09-03 2013-09-03 cylindrical multi-lug lithium ion battery and preparation method thereof Expired - Fee Related CN103500844B (en)

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Cited By (6)

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CN104091912A (en) * 2014-07-22 2014-10-08 合肥国轩高科动力能源股份公司 Multi-tab lithium battery core and welding method of multi-tab lithium battery tab
CN106207272A (en) * 2016-08-31 2016-12-07 江苏金阳光新能源科技有限公司 A kind of method realizing cylinder three lug lithium ion battery quick block weldering
CN107394097A (en) * 2017-07-14 2017-11-24 江苏春兰清洁能源研究院有限公司 A kind of pinpoint method in multi pole ears winding type lithium ion battery pole ear position
CN111430588A (en) * 2020-03-03 2020-07-17 珠海冠宇电池股份有限公司 Shell assembly of button cell, button cell and electronic product
CN116417689A (en) * 2023-05-16 2023-07-11 淮北市千锂鸟新能源科技有限公司 Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery
WO2023189939A1 (en) * 2022-03-31 2023-10-05 パナソニックIpマネジメント株式会社 Power storage device

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104091912A (en) * 2014-07-22 2014-10-08 合肥国轩高科动力能源股份公司 Multi-tab lithium battery core and welding method of multi-tab lithium battery tab
CN106207272A (en) * 2016-08-31 2016-12-07 江苏金阳光新能源科技有限公司 A kind of method realizing cylinder three lug lithium ion battery quick block weldering
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CN107394097A (en) * 2017-07-14 2017-11-24 江苏春兰清洁能源研究院有限公司 A kind of pinpoint method in multi pole ears winding type lithium ion battery pole ear position
CN111430588A (en) * 2020-03-03 2020-07-17 珠海冠宇电池股份有限公司 Shell assembly of button cell, button cell and electronic product
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WO2023189939A1 (en) * 2022-03-31 2023-10-05 パナソニックIpマネジメント株式会社 Power storage device
CN116417689A (en) * 2023-05-16 2023-07-11 淮北市千锂鸟新能源科技有限公司 Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery
CN116417689B (en) * 2023-05-16 2023-11-03 淮北市千锂鸟新能源科技有限公司 Manufacturing method of multi-pole cylindrical lithium ion battery and lithium ion battery

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