US20170288274A1 - Wound-type cell and winding mandrel - Google Patents

Wound-type cell and winding mandrel Download PDF

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Publication number
US20170288274A1
US20170288274A1 US15/457,778 US201715457778A US2017288274A1 US 20170288274 A1 US20170288274 A1 US 20170288274A1 US 201715457778 A US201715457778 A US 201715457778A US 2017288274 A1 US2017288274 A1 US 2017288274A1
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US
United States
Prior art keywords
current collector
blank
wound
electrode plate
type cell
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/457,778
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English (en)
Inventor
Qiao ZENG
Kefei Wang
Jiacai Cai
Yu Luo
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Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED reassignment NINGDE AMPEREX TECHNOLOGY LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CAI, Jiacai, LUO, Yu, WANG, KEFEI, ZENG, Qiao
Publication of US20170288274A1 publication Critical patent/US20170288274A1/en
Priority to US16/113,952 priority Critical patent/US10833371B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H01M2/263—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • 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

Definitions

  • the present disclosure relates to the field of battery, and particularly relates to a wound-type cell and a winding mandrel.
  • a blank positive current collector 111 Al foil
  • a blank negative current collector 211 Cu foil
  • the inside of the wound-type cell needs to redundantly wind a part of separator 3 which is positioned between the blank positive current collector 111 and the blank negative current collector 211 and is beyond the blank positive current collector 111 and the blank negative current collector 211 , and this will not only lead to the waste of separator, but also increase a thickness of the wound-type cell and reduce the energy density of the wound-type cell.
  • an object of the present disclosure is to provide a wound-type cell and a winding mandrel, which can reduce a usage amount of a separator and a thickness of the wound-type cell, and improve the energy density of the wound-type cell.
  • the present disclosure provides a wound-type cell, which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector, and the first electrode plate further has a blank first current collector which is positioned at a first winding start end and is not coated with the first active material layer; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and the second electrode plate further has a blank second current collector which is positioned at a second winding start end and is not coated with the second active material layer, and the blank second current collector is positioned at an inner side of the blank first current collector in a thickness direction; a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate; a first electrode tab electrically connected to the blank first current collector; and a second electrode tab electrically connected to the blank second current collector.
  • a first end of the blank first current collector is beyond a second end of the blank second current collector in a length direction, and a position of the first electrode tab is beyond the second end of the blank second current collector in the length direction; at least a part of a third winding start end of the separator is folded back to an inner side in the thickness direction and is positioned between the first electrode tab and the second electrode tab in the length direction.
  • the present disclosure provides a winding mandrel, which is used for winding the wound-type cell according to the first aspect of the present disclosure
  • the winding mandrel comprises a first winding mandrel and a second winding mandrel which are sequentially provided along the length direction, a first end surface of the first winding mandrel and a second end surface of the second winding mandrel face each other and form a clamping groove; an end of the first end surface which is close to the blank second current collector is beyond an end of the first end surface which is away from the blank second current collector in the length direction; an end of the second end surface which is close to the blank second current collector is beyond an end of the second end surface which is away from the blank second current collector in the length direction.
  • the present disclosure has the following beneficial effects: in the wound-type cell and the winding mandrel according to the present disclosure, because a length of the blank second current collector is reduced, there is no need to redundantly wind the third winding start end of the separator in large length as in the prior art, thereby reducing a usage amount of the separator and the cost of the separator.
  • the third winding start end is positioned between the first electrode tab and the second electrode tab in the length direction, a thickness of the third winding start end of the separator will not be overlapped with a thickness of the first electrode tab and a thickness of the second electrode tab, thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell.
  • FIG. 1 is a schematic view of a wound-type cell and a winding mandrel of the prior art.
  • FIG. 2 is a schematic view of a wound-type cell and a winding mandrel according to the present disclosure, in which a first winding start end, a second winding start end and a third winding start end each are indicated by a dotted line frame.
  • FIG. 3 is a schematic view of the wound-type cell according to the present disclosure, in which the first winding start end, the second winding start end and the third winding start end each are indicated by a dotted line frame.
  • a wound-type cell comprises: a first electrode plate 1 having a first current collector 11 and a first active material layer 12 coated on a surface of the first current collector 11 , and the first electrode plate 1 further has a blank first current collector 111 which is positioned at a first winding start end E 1 and is not coated with the first active material layer 12 ; a second electrode plate 2 having a second current collector 21 and a second active material layer 22 coated on a surface of the second current collector 21 , and the second electrode plate 2 further has a blank second current collector 211 which is positioned at a second winding start end E 2 and is not coated with the second active material layer 22 , and the blank second current collector 211 is positioned at an inner side of the blank first current collector 111 in a thickness direction T; a separator 3 provided between the first electrode plate 1 and the second electrode plate 2 to separate the first electrode plate 1 from the second electrode plate 2 ; a first electrode tab 4 electrically connected to the blank first
  • a first end 111 E of the blank first current collector 111 is beyond a second end 211 E of the blank second current collector 211 in a length direction L, and a position of the first electrode tab 4 is beyond the second end 211 E of the blank second current collector 211 in the length direction L; at least a part of a third winding start end E 3 of the separator 3 is folded back to an inner side in the thickness direction T and is positioned between the first electrode tab 4 and the second electrode tab 5 in the length direction L.
  • the wound-type cell because a length of the blank second current collector 211 is reduced, there is no need to redundantly wind the third winding start end E 3 of the separator 3 in large length as in the prior art, thereby reducing a usage amount of the separator 3 and the cost of the separator 3 .
  • a thickness of the third winding start end E 3 of the separator 3 will not be overlapped with a thickness of the first electrode tab 4 and a thickness of the second electrode tab 5 as the cell shown in FIG. 1 , thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell.
  • the third winding start end E 3 of the separator 3 is formed by two layers in the thickness direction T.
  • the third winding start end E 3 is a part of one layer and a part of the other layer which are clamped in a clamping groove G of a later mentioned winding mandrel; in the formed wound-type cell, the third winding start end E 3 of the separator 3 is two layers, preferably, the two layers are attached together.
  • the first electrode plate 1 may be a positive electrode plate or a negative electrode plate
  • the second electrode plate 2 may be a negative electrode plate or a positive electrode plate.
  • the first electrode plate 1 is a positive electrode plate and the second electrode plate 2 is a negative electrode plate
  • the first active material layer 12 is a positive active material layer
  • the first active material layer 12 may be selected from at least one of lithium cobalt oxide (LiCoO 2 ), lithium ferric phosphate (LiFePO 4 ) and lithium manganese oxide (LiMn 2 O 4 ).
  • the second active material layer 22 is a negative active material layer, and specifically, the second active material layer 22 may be selected from at least one of carbon and silicon.
  • the first current collector 11 is an aluminum foil
  • the second current collector 21 is a copper foil
  • the first electrode tab 4 is fixed to the blank first current collector 111 by welding.
  • the second electrode tab 5 is fixed to the blank second current collector 211 by welding.
  • the welding is laser welding, ultrasonic welding or resistance welding.
  • the thickness of the first electrode tab 4 is more than a thickness of the first current collector 11 . This can ensure a connection strength and an overcurrent sectional area of the first electrode tab 4 .
  • the thickness of second electrode tab 5 is more than a thickness of the second current collector 21 . This can ensure a connection strength and an overcurrent sectional area of the second electrode tab 5 .
  • a side of the second current collector 21 which directly faces the blank first current collector 111 is not coated with the second active material layer 22 . Because the blank first current collector 111 is not coated with the first active material layer 12 , if the side of the second current collector 21 which directly faces the blank first current collector 111 is coated with the second active material layer 22 , it is not only helpless to the capacity (lithium-ions cannot realize the reciprocating process of intercalation and deintercalation between the blank first current collector 111 and the second current collector 21 that directly faces the blank first current collector 111 ) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the side of the second current collector 21 which directly faces the blank first current collector 111 may be not coated with the second active material layer 22 , and this will avoid waste in material and improve the energy density of the wound-type cell.
  • a side of the first current collector 11 which directly faces the blank second current collector 211 is not coated with the first active material layer 12 . Because the blank second current collector 211 is not coated with the second active material layer 22 , if the side of the first current collector 11 which directly faces the blank second current collector 211 is coated with the first active material layer 12 , it is not only helpless to the capacity (lithium-ion cannot realize the reciprocating process of intercalation and deintercalation between the blank second current collector 211 and the first current collector 11 which directly faces the blank second current collector 211 ) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the side of the first current collector 11 which directly faces the blank second current collector 211 may be not coated with the first active material layer 12 , and this will avoid waste in material and improve the energy density of the wound-type cell.
  • an inner side of an arc-shaped portion C of the second current collector 21 which directly faces the first end 111 E of the blank first current collector 111 is not coated with the second active material layer 22 .
  • the inner side of the arc-shaped portion C may be not coated with the second active material layer 22 , and this will avoid waste in material and improve the energy density of the wound-type cell.
  • a winding mandrel according to a second aspect of the present disclosure is used for winding the wound-type cell according to the first aspect of the present disclosure
  • the winding mandrel comprises a first winding mandrel S 1 and a second winding mandrel S 2 which are sequentially provided along the length direction L, a first end surface S 11 of the first winding mandrel S 1 and a second end surface S 21 of the second winding mandrel S 2 face each other and form a clamping groove G; an end of the first end surface S 11 which is close to the blank second current collector 211 is beyond an end of the first end surface S 11 which is away from the blank second current collector 211 in the length direction L; correspondingly, an end of the second end surface S 21 which is close to the blank second current collector 211 is beyond an end of the second end surface S 21 which is away from the blank second current collector 211 in the length direction L.
  • the first end surface S 11 and the second end surface S 21 are parallel to each other.
  • an angle between the first end surface S 11 and a first side surface S 12 of the first winding mandrel S 1 which is close to the blank second current collector 211 is between 20 degrees and 70 degrees; correspondingly, an angle between the second end surface S 21 and a second side surface S 22 of the second winding mandrel S 2 which is close to the blank second current collector 211 is between 160 degrees and 110 degrees.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Connection Of Batteries Or Terminals (AREA)
US15/457,778 2016-03-31 2017-03-13 Wound-type cell and winding mandrel Abandoned US20170288274A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16/113,952 US10833371B2 (en) 2016-03-31 2018-08-27 Wound-type cell

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610195191.0A CN107293805B (zh) 2016-03-31 2016-03-31 卷绕式电芯及卷针
CN201610195191.0 2016-03-31

Related Child Applications (1)

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US16/113,952 Continuation US10833371B2 (en) 2016-03-31 2018-08-27 Wound-type cell

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US16/113,952 Active US10833371B2 (en) 2016-03-31 2018-08-27 Wound-type cell

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CN (1) CN107293805B (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024104105A1 (zh) * 2022-11-14 2024-05-23 惠州市豪鹏科技有限公司 极芯及电池

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110380108B (zh) * 2018-04-12 2021-10-08 宁德新能源科技有限公司 电芯及具有其的电化学装置
CN111525194B (zh) * 2020-04-28 2022-05-20 宁德新能源科技有限公司 电化学装置以及包括所述电化学装置的电子装置
CN113097435A (zh) * 2021-03-31 2021-07-09 珠海冠宇电池股份有限公司 一种电极片和电池

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US20130316206A1 (en) * 2011-03-31 2013-11-28 Lg Chem, Ltd. Mandrel for preparation of jelly-roll type electrode assembly
US20160268581A1 (en) * 2015-03-13 2016-09-15 Samsung Sdi Co., Ltd. Electrode assembly and secondary battery having the electrode assembly

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050277018A1 (en) * 2004-05-25 2005-12-15 Kim Cheon S Secondary battery
US20100285342A1 (en) * 2008-01-28 2010-11-11 Lg Chem, Ltd. Battery having enhanced electrical insulation capability
US20130260203A1 (en) * 2010-12-28 2013-10-03 Sanyo Electric Co., Ltd. Nonaqueous electrolyte secondary battery
US20130316206A1 (en) * 2011-03-31 2013-11-28 Lg Chem, Ltd. Mandrel for preparation of jelly-roll type electrode assembly
US20130045405A1 (en) * 2011-08-18 2013-02-21 Samsung Sdi Co., Ltd. Secondary battery
US20160268581A1 (en) * 2015-03-13 2016-09-15 Samsung Sdi Co., Ltd. Electrode assembly and secondary battery having the electrode assembly

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Publication number Publication date
CN107293805A (zh) 2017-10-24
US20190013550A1 (en) 2019-01-10
US10833371B2 (en) 2020-11-10
CN107293805B (zh) 2023-02-28

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