WO2018054331A1 - 一种卷绕式电芯 - Google Patents

一种卷绕式电芯 Download PDF

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Publication number
WO2018054331A1
WO2018054331A1 PCT/CN2017/102751 CN2017102751W WO2018054331A1 WO 2018054331 A1 WO2018054331 A1 WO 2018054331A1 CN 2017102751 W CN2017102751 W CN 2017102751W WO 2018054331 A1 WO2018054331 A1 WO 2018054331A1
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WIPO (PCT)
Prior art keywords
wound
pole piece
cell
connecting section
buffer layer
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PCT/CN2017/102751
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English (en)
French (fr)
Inventor
曾巧
王可飞
肖良针
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宁德新能源科技有限公司
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Publication of WO2018054331A1 publication Critical patent/WO2018054331A1/zh

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    • 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
    • H01M10/0587Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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

Definitions

  • the present application relates to the field of secondary batteries, and in particular to a wound cell.
  • the tail of the conventional winding structure is finished with aluminum foil, and the friction between the aluminum foil and the packaged aluminum foil is small. During the falling process, the impact of the bare cell body is large, and the top seal and the bottom of the bare cell are easily damaged.
  • the object of the present invention is to propose a wound cell.
  • the present application relates to a wound cell in which a flat cell is wound clockwise or counterclockwise from a starting end of a diaphragm, a first pole piece and a second pole piece.
  • the end of the wound cell is provided with a segment of the diaphragm connecting only the diaphragm, and the surface of the diaphragm connecting section facing away from the center of the wound cell is provided with a buffer layer.
  • the first pole piece is provided with a first pole
  • the second pole piece is provided with a second pole
  • the diaphragm connecting section is not in the thickness direction with the first pole and the second pole The ears are coincident.
  • the diaphragm connecting section is a single layer, and the diaphragm connecting section is provided with a buffer layer toward a surface of the center of the wound cell.
  • the diaphragm connecting section is a double layer, and a surface of the double-layer diaphragm connecting section facing away from the center of the wound cell is provided with a buffer layer.
  • At least one of the membrane connecting sections is provided with a buffer layer facing the surface of the center of the wound cell.
  • the width of the diaphragm connecting section is 1% to 20% of the width of the flat cell.
  • the diaphragm connecting section has a width of 1 to 20 mm.
  • the buffer layer of each layer has a thickness of 0.1 to 30 ⁇ m.
  • the material of the buffer layer is acrylate or polyurethane.
  • the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece; or the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.
  • the present application provides a diaphragm connecting section formed only by a diaphragm at the end of the wound cell, and a buffer layer is disposed on the surface of the diaphragm connecting section, thereby increasing the friction between the bare cell and the packaging aluminum foil, thereby reducing The impact force of the bare cell body during the drop process improves the drop resistance of the cell.
  • FIG. 1 is a schematic structural view of a conventional wound type battery core
  • FIG. 2 is a schematic structural view of a wound type electric core in a specific embodiment of the present application.
  • Figure 3 is a partial schematic view of the wound cell shown in Figure 2 of the present application.
  • FIG. 4 is a partial schematic view of a wound cell in a specific embodiment of the present application.
  • FIG. 5 is a partial schematic view of a wound cell in a specific embodiment of the present application.
  • FIG. 6 is a partial schematic view of a wound cell in a specific embodiment of the present application.
  • FIG. 7 is a partial schematic view of a wound cell in a specific embodiment of the present application.
  • FIG. 8 is a schematic structural view of a wound type electric core in a specific embodiment of the present application.
  • Figure 9 is a partial schematic view of the wound cell shown in Figure 8 of the present application.
  • FIG. 10 is a front partial view of a wound cell in a specific embodiment of the present application.
  • the embodiment of the present application relates to a wound cell 1 which is a flat cell which is wound clockwise or counterclockwise from the starting end of the diaphragm 30, the first pole piece 10 and the second pole piece 20, and is flat.
  • the outermost layer of the battery cell is formed by winding a positive electrode current collector (aluminum foil).
  • the present application is provided at the end of the wound cell 1 with a segment connecting portion 301 composed only of the diaphragm 30, and is separated from the diaphragm connecting portion 301.
  • a buffer layer 40 is provided on the surface of the center of the wound cell 1.
  • the buffer layer 40 in the present application increases the friction between the bare cell and the packaged aluminum foil, reduces the impact force of the bare cell body during the drop process, and improves the fall resistance of the cell.
  • the buffer layer 40 is disposed on the extended section of the diaphragm 30, and is not directly disposed on the outer foil of the wound cell 1 to avoid tearing of the aluminum foil by the buffer layer 40 during the falling process. Affect the performance of the secondary battery.
  • the diaphragm connecting section 301 does not overlap with the first tab 50 and the second tab 60 in the thickness direction, thereby avoiding the battery core.
  • the maximum value in the thickness direction increases the energy density of the cell.
  • the diaphragm connecting section 301 in the embodiment of the present application may be a single layer or a double layer.
  • the buffer layer 40 may be disposed on the surface facing the center of the wound cell 1, that is, the buffer layer 40 is disposed on both surfaces of the connecting layer of the diaphragm 30, As shown in FIG. 2, a partial schematic view of the buffer layer 40 is shown in FIG. It is also possible to provide the buffer layer 40 only on the surface facing away from the center of the wound cell 1, and a partial schematic view is shown in FIG.
  • the buffer layer 40 may be disposed only on the surface of the outer diaphragm connecting section 301 facing away from the center of the wound cell 1 , and a partial schematic view of the wound cell 1 is as shown in FIG. 5 ;
  • a buffer layer 40 is disposed on a surface of the double-layered diaphragm connecting section 301 facing away from the center of the wound cell 1 , A partial schematic view of the wound cell 1 is shown in FIG. 6;
  • a buffer layer 40 may also be disposed on the surface of the at least one diaphragm connecting section 301 toward the center of the wound cell 1 , and a partial schematic view of the wound cell 1 As shown in FIG.
  • a buffer layer 40 may also be disposed on the surface of the diaphragm connecting section 301 facing the center of the wound cell 1 .
  • the schematic diagram of the wound cell 1 is as shown in FIG. 8 , and a partial schematic view is shown in FIG. 9 . Show.
  • the two diaphragm connecting sections 301 may be of equal length or unequal length.
  • the width of the diaphragm connecting section 301 in the embodiment of the present application is 1% to 20% of the width of the flat cell. That is, by providing the buffer layer 40 in this range, a better buffering effect can be achieved without increasing the thickness of the cell, and the solution can be further reduced with respect to the solution of winding the diaphragm 30 around the periphery of the cell.
  • the thickness of the core increases the energy density of the cell.
  • the width of the diaphragm connecting portion 301 can be set to 1 to 20 mm.
  • each buffer layer 40 in the embodiment of the present application is 0.1 to 30 ⁇ m. Setting the buffer layer 40 within this range ensures the firmness of the buffer layer 40 to be adhered to the separator 30. If the thickness is further increased, the buffer layer 40 is liable to cause the cell to be uneven; and if the thickness is too small, the buffering capacity is generally.
  • the material of the buffer layer 40 in the embodiment of the present application includes a material having a certain elastic force and a certain adhesion, preferably at least one of polyurethane, epoxy resin, polyacrylic resin, phenolic resin, polyvinyl chloride resin or polyvinylidene fluoride.
  • a material having a certain elastic force and a certain adhesion preferably at least one of polyurethane, epoxy resin, polyacrylic resin, phenolic resin, polyvinyl chloride resin or polyvinylidene fluoride.
  • the end of the wound cell 1 may further be provided with a tail glue 70, as shown in FIG. 10, thereby fixing the diaphragm connecting section 301 provided with the buffer layer 40 to the aluminum foil on both sides thereof.
  • the winding direction of the battery cell is counterclockwise or clockwise, depending on the core winding device.
  • the second pole piece 20 when the first pole piece 10 is a positive pole piece, the second pole piece 20 is a negative pole piece; or when the first pole piece 10 is a negative pole piece, the second pole piece 20 is a positive pole Polar film.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

一种卷绕式电芯(1),为由隔膜(30)、第一极片(10)和第二极片(20)的起始端开始顺时针或逆时针卷绕而成的扁平状电芯,卷绕式电芯(1)末端设置有一段仅由隔膜(30)构成的隔膜连接段(301),隔膜连接段(301)背离卷绕式电芯(1)中心的表面设置有缓冲层(40)。通过在卷绕式电芯(1)末端设置有一段仅由隔膜(30)构成的隔膜连接段(301),并在隔膜连接段(301)的表面设置有缓冲层(40),可以增加裸电芯主体与包装铝箔之间的摩擦力,从而可减少裸电芯主体在跌落过程中受到的冲击力,提高了电芯的抗跌落性能。

Description

一种卷绕式电芯 技术领域
本申请涉及二次电池领域,具体讲,涉及一种卷绕式电芯。
背景技术
随着锂离子电芯商业化的发展,市场对锂离子电芯滥用性能的要求越来越高,尤其是抗跌落性能。常规卷绕结构尾部采用铝箔收尾,铝箔与包装铝箔间的摩擦力较小,在跌落过程中裸电芯主体受到的冲击力较大,顶封及裸电芯底部易破损。
鉴于此,特提出本申请。
发明内容
本申请的发明目的在于提出一种卷绕式电芯。
为了完成本申请的目的,采用的技术方案为:
本申请涉及一种卷绕式电芯,所述卷绕式电芯为由隔膜、第一极片和第二极片的起始端顺时针或逆时针卷绕而成的扁平状电芯,所述卷绕式电芯末端设置有一段仅由所述隔膜构成的隔膜连接段,所述隔膜连接段背离所述卷绕式电芯中心的表面设置有缓冲层。
优选的,所述第一极片上设置有第一极耳,所述第二极片上设置有第二极耳,所述隔膜连接段在厚度方向上不与所述第一极耳和第二极耳重合。
优选的,所述隔膜连接段为单层,所述隔膜连接段朝向所述卷绕式电芯中心的表面设置有缓冲层。
优选的,所述隔膜连接段为双层,双层所述隔膜连接段背离所述卷绕式电芯中心的表面均设置有缓冲层。
优选的,至少一层所述隔膜连接段朝向所述卷绕式电芯中心的表面设置有缓冲层。
优选的,所述隔膜连接段的宽度为所述扁平状电芯宽度的1%~20%。
优选的,所述隔膜连接段的宽度为1~20mm。
优选的,每层所述缓冲层的厚度为0.1~30μm。
优选的,所述缓冲层的材料为丙烯酸酯或聚氨酯。
优选的,所述第一极片为正极极片,所述第二极片为负极极片;或,所述第一极片为负极极片,所述第二极片为正极极片。
本申请的技术方案至少具有以下有益的效果:
本申请通过在卷绕式电芯末端设置有一段仅由隔膜构成的隔膜连接段,并在隔膜连接段的表面设置有缓冲层,从而增加了裸电芯与包装铝箔间的摩擦力,可减少裸电芯主体在跌落过程中受到的冲击力,提高了电芯的抗跌落性能。
附图说明
图1为现有卷绕式电芯的结构示意图;
图2为本申请某一具体实施方式中卷绕式电芯的结构示意图;
图3为本申请图2所示的卷绕式电芯的局部示意图;
图4为本申请某一具体实施方式中卷绕式电芯的局部示意图;
图5为本申请某一具体实施方式中卷绕式电芯的局部示意图;
图6为本申请某一具体实施方式中卷绕式电芯的局部示意图;
图7为本申请某一具体实施方式中卷绕式电芯的局部示意图;
图8为本申请某一具体实施方式中卷绕式电芯的结构示意图;
图9为本申请图8所示的卷绕式电芯的局部示意图;
图10为本申请某一具体实施方式中卷绕式电芯的正面局部示意图;
其中:
1-卷绕式电芯;
10-第一极片;
20-第二极片;
30-隔膜;
301-隔膜连接段;
40-缓冲层;
50-第一极耳;
60-第二极耳;
70-尾部胶。
具体实施方式
下面结合具体实施例,进一步阐述本申请。应理解,这些实施例仅用于说明本申请而不用于限制本申请的范围。
本申请实施例涉及一种卷绕式电芯1,为由隔膜30、第一极片10和第二极片20的起始端,顺时针或逆时针卷绕而成的扁平状电芯,扁平状电芯的最外层由正极集流体(铝箔)卷绕而成,本申请在卷绕式电芯1末端设置有一段仅由隔膜30构成的隔膜连接段301,并在隔膜连接段301背离卷绕式电芯1中心的表面设置缓冲层40。本申请中的缓冲层40增加了裸电芯与包装铝箔间的摩擦力,减少了裸电芯主体在跌落过程中受到的冲击力,提高了电芯的抗跌落性能。并且本申请将缓冲层40设置于隔膜30的延长段上,而并非直接设置于卷绕式电芯1最外圈的铝箔上,避免了跌落过程中缓冲层40对铝箔造成的撕裂,进而影响二次电池的性能。
如图1所示,为了避免缓冲层40增加卷绕式电芯1的厚度,隔膜连接段301在厚度方向上不与第一极耳50和第二极耳60重合,从而可避开电芯厚度方向上的最大值,提高电芯的能量密度。
本申请实施例中的隔膜连接段301可为单层或双层。
当隔膜连接段301为单层时,为了增加制备的便捷性,可在朝向卷绕式电芯1中心的表面也设置缓冲层40,即在隔膜30连接层的双表面均设置缓冲层40,如图2所示,缓冲层40的局部示意图如图3所示。也可仅在背离卷绕式电芯1中心的表面设置缓冲层40,局部示意图如图4所示。
当隔膜连接段301为双层时,可仅在外层隔膜连接段301背离卷绕式电芯1中心的表面设置缓冲层40,卷绕式电芯1的局部示意图如图5所示;也可在双层隔膜连接段301背离卷绕式电芯1中心的表面均设置缓冲层40, 卷绕式电芯1的局部示意图如图6所示;也可在至少一层隔膜连接段301朝向卷绕式电芯1中心的表面设置有缓冲层40,卷绕式电芯1的局部示意图如图7所示;也可在隔膜连接段301朝向卷绕式电芯1中心的表面设置均设置有缓冲层40,卷绕式电芯1示意图如图8所示,局部示意图如图9所示。
当隔膜连接段301为双层时,两层隔膜连接段301可为等长或不等长的。
本申请实施例中的隔膜连接段301的宽度为扁平状电芯宽度的1%~20%。即,在该范围内设置缓冲层40,即可达到较好的缓冲效果,又不会增加的电芯的厚度,相对于在电芯外周卷绕一圈隔膜30的方案,可进一步减小电芯的厚度,提高电芯的能量密度。
在常用的卷绕式电芯1型号中,隔膜连接段301的宽度可设置为1~20mm。
本申请实施例中每层缓冲层40的厚度为0.1~30μm。将缓冲层40设置在该范围内,保证了缓冲层40在隔膜30上粘贴的牢固性。如果厚度进一步提高,缓冲层40则易造成电芯不平整;而如果厚度过小,则缓冲能力一般。
本申请实施例中缓冲层40的材料包括具有一定弹力并具有一定粘附力的材料,优选聚氨酯、环氧树脂、聚丙烯酸树脂、酚醛树脂、聚氯乙烯树脂或聚偏氟乙烯中的至少一种。
在本申请实施例中卷绕式电芯1的末端可进一步设置尾部胶70,如图10所示,从而将设置有缓冲层40的隔膜连接段301与位于其两侧的铝箔相固定。
在本申请实施例中,电芯的卷绕方向为逆时针或顺时针,根据电芯卷绕设备而定。
在本申请实施例中,当第一极片10为正极极片时,第二极片20为负极极片;或,当第一极片10为负极极片时,第二极片20为正极极片。
本申请虽然以较佳实施例公开如上,但并不是用来限定权利要求,任 何本领域技术人员在不脱离本申请构思的前提下,都可以做出若干可能的变动和修改,因此本申请的保护范围应当以本申请权利要求所界定的范围为准。

Claims (10)

  1. 一种卷绕式电芯,所述卷绕式电芯为由隔膜、第一极片和第二极片的起始端顺时针或逆时针卷绕而成的扁平状电芯,其特征在于,
    所述卷绕式电芯末端设置有一段仅由所述隔膜构成的隔膜连接段,所述隔膜连接段背离所述卷绕式电芯中心的表面设置有缓冲层。
  2. 根据权利要求1所述的卷绕式电芯,其特征在于,所述第一极片上设置有第一极耳,所述第二极片上设置有第二极耳,所述隔膜连接段在厚度方向上不与所述第一极耳和第二极耳重合。
  3. 根据权利要求1所述的卷绕式电芯,其特征在于,所述隔膜连接段为单层,所述隔膜连接段朝向所述卷绕式电芯中心的表面设置有缓冲层。
  4. 根据权利要求1所述的卷绕式电芯,其特征在于,所述隔膜连接段为双层,双层所述隔膜连接段背离所述卷绕式电芯中心的表面均设置有缓冲层。
  5. 根据权利要求4所述的卷绕式电芯,其特征在于,至少一层所述隔膜连接段朝向所述卷绕式电芯中心的表面设置有缓冲层。
  6. 根据权利要求1所述的卷绕式电芯,其特征在于,所述隔膜连接段的宽度为所述扁平状电芯宽度的1%~20%。
  7. 根据权利要求1所述的卷绕式电芯,其特征在于,所述隔膜连接段的宽度为1~20mm。
  8. 根据权利要求1所述的卷绕式电芯,其特征在于,每层所述缓冲层的厚度为0.1~30μm。
  9. 根据权利要求1所述的卷绕式电芯,其特征在于,所述缓冲层的材料包括聚氨酯、环氧树脂、聚丙烯酸树脂、酚醛树脂、聚氯乙烯树脂或聚偏氟乙烯中的至少一种。
  10. 根据权利要求1~9任一权利要求所述的卷绕式电芯,其特征在于,所述第一极片为正极极片,所述第二极片为负极极片;或,所述第一极片为负极极片,所述第二极片为正极极片。
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