WO2018036489A1 - 一种卷绕式电芯 - Google Patents

一种卷绕式电芯 Download PDF

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Publication number
WO2018036489A1
WO2018036489A1 PCT/CN2017/098532 CN2017098532W WO2018036489A1 WO 2018036489 A1 WO2018036489 A1 WO 2018036489A1 CN 2017098532 W CN2017098532 W CN 2017098532W WO 2018036489 A1 WO2018036489 A1 WO 2018036489A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
diaphragm
tab
pole
starting end
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PCT/CN2017/098532
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English (en)
French (fr)
Inventor
肖良针
曾巧
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宁德新能源科技有限公司
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Publication of WO2018036489A1 publication Critical patent/WO2018036489A1/zh

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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
    • 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 application relates to the field of secondary batteries, and in particular to a wound cell.
  • the battery cell is an active component, and is generally formed by laminating or winding a positive electrode pole piece, a negative electrode pole piece, and a separator disposed between the positive electrode pole piece and the negative electrode pole piece.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material coated on a surface of the positive electrode current collector; the negative electrode sheet includes a negative electrode current collector and a negative electrode active material coated on the surface of the negative electrode current collector.
  • the inside of the wound cell needs to be wound with a layer of isolation film, and the innermost layer of the cell has four layers of isolation films continuously stacked, which not only causes waste of the separator. And increase the thickness of the cell to reduce the energy density of the cell.
  • the present application is specifically directed to the deficiencies of the prior art.
  • the object of the present invention is to propose a wound cell.
  • the present application relates to a wound cell in which a first diaphragm, a first pole piece, a second diaphragm, and a second pole piece are sequentially stacked and wound, and the head of the first pole piece An empty foil region and electrically connected to the first tab, the head of the second pole piece being an empty foil region and electrically connected to the second tab;
  • a center line of the battery core in a width direction is a core center line
  • a first bending point of the first pole piece is a first bending point
  • the first bending portion passes through the first bending portion a line parallel to the center line of the cell is a first bending line
  • a starting end of the first pole piece is a first starting end
  • the distance from the first starting end to the first bending line is smaller than the distance from the second pole to the first bending line.
  • the distance from the first starting end to the first tab is a first pole piece head, and the first pole piece head is folded back inside the battery core to form a first pole piece back-folding section, the first The pole piece retracting section does not coincide with the first tab and the second tab in the thickness direction.
  • the distance from the starting end of the second pole piece to the second pole piece is a second pole piece head, and the second pole piece head is folded back inside the battery core to form a second pole piece folding section.
  • the second pole piece retracting section does not coincide with the first tab and the second tab in a thickness direction.
  • the distance from the starting end of the first diaphragm to the first tab is a first diaphragm head, and the distance from the starting end of the second diaphragm to the first tab is Two diaphragm head;
  • the first diaphragm head and the second diaphragm head are disposed in parallel along a length direction of the battery core, or the first diaphragm head is folded back inside the battery core to form a diaphragm retracting section, or the first A diaphragm head and the second diaphragm head are folded back inside the battery core to form a diaphragm retracting section; neither of the diaphragm retracting sections coincides with the first tab and the second tab.
  • the first tab and the second tab are respectively located on two sides of the center line of the battery.
  • the starting end of the first membrane is connected to the starting end of the second membrane around the first starting end.
  • the winding direction of the battery cell is counterclockwise or clockwise.
  • the first pole piece is a positive pole piece, the first pole is a positive pole, the second pole is a negative pole piece, and the second pole is a negative pole; or
  • the first pole piece is a negative pole piece, the first pole is a negative pole, the second pole is a positive pole piece, and the second pole is a positive pole.
  • the present application also relates to a reel for preparing a wound cell of the present application, the reel including Two sets of parallel-arranged needle sheets with a gap therebetween for the passage of the first diaphragm and/or the second diaphragm, at least one of the set of needles including a first needle assembly and a second needle assembly, a gap for the passage of the first diaphragm or the first pole piece is left between the first needle assembly and the second needle assembly, the first needle assembly And/or the width of the second needle assembly is greater than or equal to the distance from the first starting end to the first bending line.
  • the needle further comprises a needle base, and two sets of the needle sheets are disposed on the needle base.
  • the wound cell of the present application can save the amount of the diaphragm, increase the energy density, and reduce the cost.
  • FIG. 1 is a schematic view showing the structure of a wound type electric core in the background art
  • FIG. 2 is a schematic view showing the structure of a further winding type electric core in the background art
  • FIG. 3 is a schematic structural view of a winding needle for preparing a wound type electric cell of the present application
  • Figure 4 is a schematic view showing the winding of the wound cell of the present application.
  • FIG. 5 is still another winding diagram of the wound cell of the present application.
  • FIG. 6 is a schematic structural view of a wound type electric core in a specific embodiment of the present application.
  • FIG. 7 is a schematic structural view of a wound type electric core 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.
  • FIG. 9 is a schematic structural view of a wound type electric core in a specific embodiment of the present application.
  • FIG. 10 is a schematic structural view of a wound type electric core in a specific embodiment of the present application.
  • FIG. 11 is a schematic structural view of a wound type electric core in a specific embodiment of the present application.
  • the embodiment of the present application relates to a wound cell 1 in which the first diaphragm 10, the first pole piece 30, the second diaphragm 20, and the second pole piece 40 are sequentially stacked and wound.
  • a battery cell the head of the first pole piece 30 is an empty foil area and is electrically connected to the first tab 50, the head of the second pole piece 40 is an empty foil area and is electrically connected to the second tab 60;
  • the center line of the core in the width direction is the center line of the battery;
  • the first bend of the first pole piece 30 is the first bend 303, passes through the first bend 303 and is parallel to the center line of the battery
  • the line is the first bending line;
  • the starting end of the first pole piece 30 is the first starting end 302.
  • the distance from the first starting end 302 to the first bending line is smaller than the distance from the second pole 60 to the first bending line, that is, the second pole 60 is not between the first starting end 302 and the first bending line.
  • the distances coincide to avoid increasing the thickness of the cells.
  • the starting end of the first diaphragm 10 and the starting end of the second diaphragm 20 are both located between the first starting end 302 and the second pole 60.
  • the present application limits the starting position of the diaphragm to the specific position, thereby The head no longer needs to continuously overlap the four layers of the diaphragm, which saves the raw material of the diaphragm, reduces the thickness of the battery core, saves cost, and increases the volumetric energy density of the battery core.
  • First diaphragm 10 and the second diaphragm 20 not only completely isolate the first pole piece 30 from the second pole piece 40, and both the starting end of the first diaphragm 10 and the starting end of the second diaphragm 20 are in the thickness direction with the second tab 60 Do not overlap, you can avoid increasing the thickness of the battery.
  • the first diaphragm 10 and the second diaphragm 20 in the embodiment of the present application may be separate or connected together, that is, the starting end of the first diaphragm 10 bypasses the starting end of the first starting end 302 and the second diaphragm 20. Connected, the entire diaphragm can further simplify the winding of the cell.
  • the needle 2 used in the embodiment of the present application is as shown in FIG. 3.
  • the needle 2 includes a needle base and two sets of parallelly arranged needle sheets, and two sets of needle sheets are disposed on the needle base; two sets of rolls A gap is provided between the needle pieces for the passage of the first diaphragm 10 and/or the second diaphragm 20, wherein one set of the needle sheets includes the first needle assembly 21 and the second needle assembly 22, and the other needle sheet is called a third component 23; a gap for the passage of the first diaphragm 10 or the first pole piece 30 between the first needle assembly 21 and the second needle assembly 22, the first needle assembly 21 and/or the second
  • the width of the needle assembly 22 is greater than or equal to the distance from the first starting end 302 to the first bending line.
  • FIG. 1 When the battery core is wound counterclockwise, a schematic view of the winding is shown in FIG.
  • the starting end of the first pole piece 30 is fixed to the upper surface of the first winding unit 21 from left to right such that the distance from the first starting end 302 to the first bending line is the same as the width of the first winding unit 21.
  • the first diaphragm 10 is then fixed above the first pole piece 30, and the second diaphragm 20 is fixed in the gap between the first needle assembly 21 and the third assembly 23 while bending the innermost circumference of the second pole piece 40.
  • the folded head is fixed to the lower surface of the third component 23 from right to left.
  • the first starting end 302 may be flush with the right end of the first reel assembly 21 such that the distance from the first starting end 302 to the first bending line is the same as the width of the first reel assembly 21; or the first starting end 302 may not The right end of the first reel assembly 21 is flush such that the distance from the first starting end 302 to the first bending line is less than the width of the first reel assembly 21.
  • the present application winds the first starting end 302 by using a continuous diaphragm and then performs winding.
  • the winding is schematically illustrated in FIG.
  • the diaphragm is wound from left to right along the left end of the first reel assembly 21 and passes through the gap, and then wound to the left, and passes through the gap between the first reel assembly 21 and the third assembly 23, Arriving at the left end of the winding needle 2, fixing the starting end of the first pole piece 30 from the left to the right to the upper surface of the first winding needle assembly 21, so that the diaphragm wraps the first pole piece 30 The beginning of the.
  • the head of the second pole piece 40 bent at the innermost circle is fixed to the lower surface of the third component 23 from right to left. Then, the winding needle 2 is started to be wound, and after the winding is completed, the winding needle 2 is taken out to obtain the wound battery of the present application.
  • the winding direction of the battery cell is counterclockwise or clockwise, and the specific winding direction depends on the device.
  • first tab 50 and the second tab 60 may be located on both sides or the same side of the center line of the battery.
  • the first tab 50 and the second tab 60 Can be located on both sides of the center line of the battery.
  • the head of the first pole piece 30 and the head of the second pole piece 40 are both straight, and the head of the first diaphragm 10 and the head of the second diaphragm 20 are also along the length of the battery core.
  • the battery core is shown in Figure 8.
  • the head of the first diaphragm 10 when the head of the first pole piece 30 and the head of the second pole piece 40 are both straight, in order to increase the convenience of preparation, the head of the first diaphragm 10 can be folded back inside the battery core.
  • Forming a diaphragm retracting section the diaphragm retracting section may be formed by inserting a starting end of the first diaphragm 10 into a gap between the first reel assembly 21 and the second reel assembly 22, the diaphragm retracting section not being the first tab 50 and the second The tabs 60 are coincident to avoid increasing the thickness of the cells.
  • both the head of the first diaphragm 10 and the head of the second diaphragm 20 may be folded back.
  • the distance from the first starting end 302 to the first tab 50 is the first pole piece head, and the first pole piece head is folded back inside the cell to form the first pole piece back-folding section 301, the first pole
  • the sheet retracting section 301 can be formed by the first starting end 302 being inserted into the gap between the first and second reeling assemblies 21, 22.
  • the first pole piece folding section 301 does not coincide with the first tab 50 and the second tab 60 in the thickness direction as shown in FIG.
  • the first pole piece folding back section 301 does not increase the thickness of the battery core, and can ensure that the first pole piece 30 has sufficient space in the piece cutting, and does not cut the ear rubber, the first pole.
  • the direction of retraction of the sheet retracting section 301 is the same as or opposite to the winding direction of the cell.
  • the distance from the starting end of the second pole piece 40 to the second tab 60 is the head of the second pole piece 40, and the head of the second pole piece 40 is folded back inside the cell to form a second pole piece back.
  • the segment 401, the second pole piece folding section 401 and the first tab 50 and the second tab 60 do not coincide in the thickness direction, as shown in FIG.
  • the second pole piece folding section 401 does not increase the thickness of the battery core.
  • the second pole piece 40 can be ensured that there is sufficient space in the piece to cut the ear rubber, and the folding direction of the second pole piece folding back portion 401 is the same as or opposite to the winding direction of the battery core.
  • the starting ends of the first starting end 302 and the second pole piece 40 can be folded back at the same time, the head of the first pole piece 30 is folded back into a first pole piece folding back section 301, and the second pole piece 40 is folded back.
  • the second pole piece retracting section 401, the first pole piece folding back section 301 and the first tab 50 and the second tab 60 do not overlap in the thickness direction, and the second pole piece backing section 401 is also combined with the first tab 50 and the first pole
  • the two tabs 60 do not overlap in the thickness direction as shown in FIG.
  • the first pole piece retracting section 301 and the second pole piece retracting section 401 do not increase the thickness of the battery core, and can ensure that the first pole piece 30 and the second pole piece 40 have sufficient space when cutting the piece, and will not The tip rubber is cut, the retracting direction of the first pole piece retracting section 301 is the same as or opposite to the winding direction of the electric core, and the reversing direction of the second pole piece retracting section 401 is the same as or opposite to the winding direction of the electric core.
  • the first pole piece 30 is a positive pole piece, the first pole 50 is a positive pole, the second pole 40 is a negative pole piece, and the second pole 60 is a negative pole; or,
  • the pole piece 30 is a negative pole piece, the first pole 50 is a negative pole, the second pole 40 is a positive pole piece, and the second pole 60 is a positive pole.
  • the length of the active material can be flexibly designed according to the selection of the first pole piece 30 and the second pole piece 40.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种卷绕式电芯（1），应用于二次电池领域，该卷绕式电芯（1）为由第一隔膜（10）、第一极片（30）、第二隔膜（20）、第二极片（40）依次叠置并卷绕而成的电芯，第一极片（30）的头部为空箔区且电连接有第一极耳（50），第二极片（40）的头部为空箔区且电连接有第二极耳（60）；电芯（1）在宽度方向上的中心线为电芯中线，第一极片（30）第一次发生弯折的位点为第一弯折处（303），通过第一弯折处（303）且与电芯中线平行的线为第一弯折线，第一极片（30）的起始端为第一起始端（302）；第一隔膜（10）的起始端和第二隔膜（20）的起始端位于第一起始端（302）与第二极耳（60）之间，第一起始端（302）到第一弯折线的距离小于第二极耳（60）到第一弯折线的距离。该卷绕式电芯（1），可节省隔膜用量，提升能量密度，并可降低成本。

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
目前市场上广泛应用的二次电池，都由二次电池的电芯和外壳组成。其中，电芯为活性部件，一般由正极极片、负极极片以及设置在正极极片和负极极片之间的隔膜层叠或者卷绕而成。正极片包括正极集流体及涂覆在正极集流体表面的正极活性物质；负极片包括负极集流体及涂覆在负极集流体表面的负极活性物质。
随着二次电芯商业化的发展，市场对其能量密度的要求越来越高。目前聚合物锂离子电池在不断追求高能量密度，而常用的提高能量密度的方法有：减小集流体，极耳，隔离膜和铝塑膜的厚度，提高阴阳极材料的单位容量以及压实和面密度，减小电芯充电膨胀。而这些解决方法目前受到了材料本身或者加工的限制，进一步提升越来越困难，同时可能会带来高成本或者高风险。
目前传统的卷绕方式中，如图1和图2所示，卷绕式电芯的内部需要空卷一层隔离膜，电芯最内侧有4层隔离膜连续堆叠，不但造成隔离膜的浪费，而且增加电芯厚度从而降低电芯的能量密度。
针对现有技术的缺陷，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，由第一隔膜、第一极片、第二隔膜、第二极片依次叠置并卷绕而成的电芯，所述第一极片的头部为空箔区且电连接有第一极耳，所述第二极片的头部为空箔区且电连接有第二极耳；
所述电芯在宽度方向上的中心线为电芯中线，所述第一极片第一次发生弯折的位点为第一弯折处，通过所述第一弯折处且与所述电芯中线平行的线为第一弯折线，所述第一极片的起始端为第一起始端；
所述第一隔膜的起始端和所述第二隔膜的起始端位于所述第一起始端与所述第二极耳之间；
所述第一起始端到所述第一弯折线的距离小于所述第二极耳到所述第一弯折线的距离。
优选的，所述第一起始端到第一极耳的距离为第一极片头部，所述第一极片头部在所述电芯内部回折形成第一极片回折段，所述第一极片回折段与所述第一极耳和所述第二极耳在厚度方向上不重合。
优选的，所述第二极片的起始端到第二极耳的距离为第二极片头部，所述第二极片头部在所述电芯内部回折形成第二极片回折段，所述第二极片回折段与所述第一极耳和所述第二极耳在厚度方向上不重合。
优选的，所述第一隔膜的起始端到所述第一极耳之间的距离为第一隔膜头部，所述第二隔膜的起始端到所述第一极耳之间的距离为第二隔膜头部；
所述第一隔膜头部与所述第二隔膜头部沿所述电芯的长度方向平行设置，或所述第一隔膜头部在所述电芯内部回折形成隔膜回折段，或所述第一隔膜头部和所述第二隔膜头部在所述电芯内部回折形成隔膜回折段；所述隔膜回折段均不与所述第一极耳和所述第二极耳重合。
优选的，所述第一极耳和所述第二极耳分别位于所述电芯中线的两侧。
优选的，所述第一隔膜的起始端绕过所述第一起始端与所述第二隔膜的起始端相连接。
优选的，所述电芯的卷绕方向为逆时针或顺时针。
优选的，所述第一极片为正极极片，所述第一极耳为正极极耳，所述第二极片为负极极片，所述第二极耳为负极极耳；或，所述第一极片为负极极片，所述第一极耳为负极极耳，所述第二极片为正极极片，所述第二极耳为正极极耳。
本申请还涉及一种用于制备本申请卷绕式电芯的卷针，所述卷针包括 两组平行排列的卷针片，所述卷针片之间留有用于所述第一隔膜和/或第二隔膜穿过的间隙，至少一组所述卷针片包括第一卷针组件和第二卷针组件，所述第一卷针组件和所述第二卷针组件之间留有用于所述第一隔膜或所述第一极片穿过的间隙，所述第一卷针组件和/或所述第二卷针组件的宽度大于或等于所述第一起始端到所述第一弯折线的距离。
优选的，所述卷针还包括卷针基台，两组所述卷针片设置于所述卷针基台上。
本申请的技术方案至少具有以下有益的效果：
本申请的卷绕式电芯，可节省隔膜用量，提升能量密度，并可降低成本。
附图说明
图1为背景技术中卷绕式电芯结构示意图；
图2为背景技术中又一卷绕式电芯结构示意图；
图3为制备本申请卷绕式电芯的卷针的结构示意图；
图4为本申请卷绕式电芯的卷绕示意图；
图5为本申请卷绕式电芯的又一卷绕示意图；
图6为本申请某一具体实施方式中的卷绕式电芯结构示意图；
图7为本申请某一具体实施方式中的卷绕式电芯结构示意图；
图8为本申请某一具体实施方式中的卷绕式电芯结构示意图；
图9为本申请某一具体实施方式中的卷绕式电芯结构示意图；
图10为本申请某一具体实施方式中的卷绕式电芯结构示意图；
图11为本申请某一具体实施方式中的卷绕式电芯结构示意图；
其中：
1-卷绕式电芯；
10-第一隔膜；
20-第二隔膜；
30-第一极片；
301-第一极片回折段；
302-第一起始端；
303-第一弯折处；
40-第二极片；
401-第二极片回折段；
50-第一极耳；
60-第二极耳；
2-卷针；
21-第一卷针组件；
22-第二卷针组件；
23-第三组件。
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。文中所述“左”、“右”、“上”、“下”均以附图中的卷绕式电芯1和卷针2的放置状态为参照。
本申请实施例涉及一种卷绕式电芯1，卷绕式电芯1为由第一隔膜10、第一极片30、第二隔膜20、第二极片40依次叠置并卷绕而成的电芯，第一极片30的头部为空箔区且电连接有第一极耳50，第二极片40的头部为空箔区且电连接有第二极耳60；电芯在宽度方向上的中心线为电芯中线；第一极片30第一次发生弯折的位点为第一弯折处303，通过第一弯折处303且与所述电芯中线平行的线为第一弯折线；第一极片30的起始端为第一起始端302。
本申请实施例中，第一起始端302到第一弯折线的距离小于第二极耳60到第一弯折线的距离，即第二极耳60不与第一起始端302到第一弯折线之间的距离重合，从而可避免增加电芯的厚度。
本申请实施例中第一隔膜10的起始端和第二隔膜20的起始端均位于第一起始端302与第二极耳60之间，本申请将隔膜的起始位置限定于该特定位置，从而头部不再需要连续重叠4层隔膜，可节省隔膜的原材料，减小了电芯的厚度，节约了成本，且提升了电芯的体积能量密度。第一隔膜 10与第二隔膜20不仅完全将第一极片30与第二极片40相隔离，并且第一隔膜10的起始端和第二隔膜20的起始端均与第二极耳60在厚度方向上不重合，可避免增加电芯的厚度。
本申请实施例中的第一隔膜10和第二隔膜20可以是分离的，也可以是连接在一起的，即第一隔膜10的起始端绕过第一起始端302与第二隔膜20的起始端相连接，采用整条隔膜可进一步简化电芯的卷绕方式。
本申请实施例所使用的卷针2如图3所示，卷针2包括卷针基台和两组平行排列的卷针片，两组卷针片设置于卷针基台上；两组卷针片之间留有用于第一隔膜10和/或第二隔膜20穿过的间隙，其中一组卷针片包括第一卷针组件21和第二卷针组件22，另一个卷针片称为第三组件23；第一卷针组件21和第二卷针组件22之间留有用于第一隔膜10或第一极片30穿过的间隙，第一卷针组件21和/或第二卷针组件22的宽度大于或等于第一起始端302到第一弯折线的距离。在电芯逆时针卷绕时，卷绕的示意图如图4所示。将第一极片30的起始端从左向右固定于第一卷针组件21的上表面，从而使第一起始端302到第一弯折线的距离与第一卷针组件21的宽度相同。然后将第一隔膜10固定于第一极片30上方，将第二隔膜20固定于第一卷针组件21与第三组件23之间的间隙中，同时将第二极片40最内圈弯折后的头部从右向左固定于第三组件23的下表面。然后启动卷针2进行卷绕，卷绕完毕后，抽出卷针2即得本申请的卷绕式电芯。其中，第一起始端302可与第一卷针组件21的右端齐平，从而使第一起始端302到第一弯折线的距离与第一卷针组件21的宽度相同；或者第一起始端302可不与第一卷针组件21的右端齐平，从而使第一起始端302到第一弯折线的距离小于第一卷针组件21的宽度。
当本申请实施例采用整条隔膜进行卷绕时，可增加制备的便捷性。本申请通过使用连续的隔膜缠绕第一起始端302，然后进行卷绕，在电芯逆时针卷绕时，卷绕的示意图如图5所示。先将隔膜沿第一卷针组件21的左端从左向右进行卷绕并穿过间隙，然后向左卷绕，沿第一卷针组件21和第三组件23之间的间隙中穿出，到达卷针2的左端，将第一极片30的起始端从左向右固定于第一卷针组件21的上表面，使隔膜包裹住第一极片30 的起始端。同时将第二极片40最内圈弯折后的头部从右向左固定于第三组件23的下表面。然后启动卷针2进行卷绕，卷绕完毕后，抽出卷针2即得本申请的卷绕式电芯。
本申请实施例电芯的卷绕方向为逆时针或顺时针，具体卷绕方向根据设备而定。
在本申请实施例中，第一极耳50和第二极耳60可位于电芯中线的两侧或同侧，为了进一步增加电芯的对称性，第一极耳50和第二极耳60可分别位于电芯中线的两侧。
在本申请实施例中，第一极片30的头部与第二极片40的头部均为平直的，第一隔膜10头部与第二隔膜20头部也沿电芯的长度方向平行设置，当隔膜为分离时，电芯卷绕的示意图如图6所示；当隔膜为连续时，电芯卷绕的示意图如图7所示；该卷绕式电芯顺时针卷绕的电芯如图8所示。
在本申请实施例中，当第一极片30的头部与第二极片40的头部均为平直时，为了增加制备的便捷性，第一隔膜10头部可在电芯内部回折形成隔膜回折段，隔膜回折段可由第一隔膜10的起始端插入第一卷针组件21和第二卷针组件22的间隙而形成，该隔膜回折段均不与第一极耳50和第二极耳60重合，以避免增加电芯的厚度。或者，第一隔膜10头部和第二隔膜20头部均可发生回折。
在本申请实施例中，第一起始端302到第一极耳50的距离为第一极片头部，第一极片头部在电芯内部回折形成第一极片回折段301，第一极片回折段301可由第一起始端302插入第一卷针组件21和第二卷针组件22的间隙而形成。第一极片回折段301与第一极耳50和第二极耳60在厚度方向上不重合，如图9所示。在该实施方式中，第一极片回折段301并不会增加电芯的厚度，并可保证第一极片30在裁片时有足够的空间，不会裁到极耳胶，第一极片回折段301的回折方向与电芯的卷绕方向相同或相反。
在本申请实施例中，第二极片40的起始端到第二极耳60的距离为第二极片40头部，第二极片40头部在电芯内部回折形成第二极片回折段401，第二极片回折段401与第一极耳50和第二极耳60在厚度方向上不重合，如图10所示。在该实施方式中，第二极片回折段401并不会增加电芯的厚 度，并可保证第二极片40在裁片时有足够的空间，不会裁到极耳胶，第二极片回折段401的回折方向与电芯的卷绕方向相同或相反。
在本申请实施例中，第一起始端302和第二极片40的起始端可同时发生回折，第一极片30头部回折形成为第一极片回折段301，第二极片40回折形成第二极片回折段401，第一极片回折段301与第一极耳50和第二极耳60在厚度方向上不重合，第二极片回折段401也与第一极耳50和第二极耳60在厚度方向上不重合，如图11所示。第一极片回折段301和第二极片回折段401都不会增加电芯的厚度，并可保证第一极片30、第二极片40在裁片时都有足够的空间，不会裁到极耳胶，第一极片回折段301的回折方向与电芯的卷绕方向相同或相反，第二极片回折段401的回折方向与电芯的卷绕方向相同或相反。
在上述具体实施方式中，第一极片30为正极极片，第一极耳50为正极极耳，第二极片40为负极极片，第二极耳60为负极极耳；或者，第一极片30为负极极片，第一极耳50为负极极耳，第二极片40为正极极片，第二极耳60为正极极耳。并可根据第一极片30、第二极片40的选择，灵活的设计活性物质的长度。
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、第二极片依次叠置并卷绕而成的电芯，所述第一极片的头部为空箔区且电连接有第一极耳，所述第二极片的头部为空箔区且电连接有第二极耳；其特征在于，
    所述电芯在宽度方向上的中心线为电芯中线，所述第一极片第一次发生弯折的位点为第一弯折处，通过所述第一弯折处且与所述电芯中线平行的线为第一弯折线，所述第一极片的起始端为第一起始端；
    所述隔膜起始端位于所述第一起始端与所述第二极耳之间；
    所述第一起始端到所述第一弯折线的距离小于所述第二极耳到所述第一弯折线的距离。
  2. 根据权利要求1所述的卷绕式电芯，其特征在于，所述第一起始端到第一极耳的距离为第一极片头部，所述第一极片头部在所述电芯内部回折形成第一极片回折段，所述第一极片回折段与所述第一极耳和所述第二极耳在厚度方向上不重合。
  3. 根据权利要求1或2所述的卷绕式电芯，其特征在于，所述第二极片的起始端到第二极耳的距离为第二极片头部，所述第二极片头部在所述电芯内部回折形成第二极片回折段，所述第二极片回折段与所述第一极耳和所述第二极耳在厚度方向上不重合。
  4. 根据权利要求1所述的卷绕式电芯，其特征在于，其特征在于，所述隔膜包括第一隔膜和第二隔膜，所述第一隔膜的起始端到所述第一极耳之间的距离为第一隔膜头部，所述第二隔膜的起始端到所述第一极耳之间的距离为第二隔膜头部；
    所述第一隔膜头部与所述第二隔膜头部沿所述电芯的长度方向平行设置，或所述第一隔膜头部在所述电芯内部回折形成隔膜回折段，或所述第一隔膜头部和所述第二隔膜头部在所述电芯内部回折形成隔膜回折段；所述隔膜回折段均不与所述第一极耳和所述第二极耳重合。
  5. 根据权利要求1或2所述的卷绕式电芯，其特征在于，所述第一极耳和所述第二极耳分别位于所述电芯中线的两侧。
  6. 根据权利要求4所述的卷绕式电芯，其特征在于，所述第一隔膜的起始端与所述第二隔膜的起始端相连接。
  7. 根据权利要求1所述的卷绕式电芯，其特征在于，所述电芯的卷绕方向为逆时针或顺时针。
  8. 根据权利要求1所述的二次电池电芯，其特征在于，所述第一极片为正极极片，所述第一极耳为正极极耳，所述第二极片为负极极片，所述第二极耳为负极极耳；或，所述第一极片为负极极片，所述第一极耳为负极极耳，所述第二极片为正极极片，所述第二极耳为正极极耳。
  9. 一种用于制备权利要求1所述卷绕式电芯的卷针，其特征在于，
    所述卷针包括两组平行排列的卷针片，所述卷针片之间留有用于所述第一隔膜和/或第二隔膜穿过的间隙，至少一组所述卷针片包括第一卷针组件和第二卷针组件，所述第一卷针组件和所述第二卷针组件之间留有用于所述第一隔膜或所述第一极片穿过的间隙，所述第一卷针组件和/或所述第二卷针组件的宽度大于或等于所述第一起始端到所述第一弯折线的距离。
  10. 根据权利要求9所述的卷针，其特征在于，所述卷针还包括卷针基台，两组所述卷针片设置于所述卷针基台上。
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