WO2018076410A1 - 极片及绕卷电芯 - Google Patents

极片及绕卷电芯 Download PDF

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Publication number
WO2018076410A1
WO2018076410A1 PCT/CN2016/105873 CN2016105873W WO2018076410A1 WO 2018076410 A1 WO2018076410 A1 WO 2018076410A1 CN 2016105873 W CN2016105873 W CN 2016105873W WO 2018076410 A1 WO2018076410 A1 WO 2018076410A1
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Prior art keywords
pole
segment
segments
pole segment
width direction
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Ceased
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PCT/CN2016/105873
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English (en)
French (fr)
Inventor
吴飞
王可飞
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Publication of WO2018076410A1 publication Critical patent/WO2018076410A1/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • 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 energy storage devices, and in particular, to a pole piece and a wound core.
  • the laminated cell manufacturing solution represented by LG has a natural advantage.
  • the stepped shaped cell is usually realized by splicing the size of the cell.
  • the winding step electric cells spliced in this way are complicated in manufacturing process, and it is required to splicing bare batteries of different sizes, and the assembly fixing and the ear design are also cumbersome; on the other hand, the winding batteries of various sizes are the most The single-sided area of the outer ring and the innermost ring also reduces the energy density of the overall cell. Therefore, there is a need to develop a method of winding a stepped cell that is simple and easy to solve and that can solve the problem of multiple winding energy density loss.
  • the present application provides a pole piece and a wound core, which can solve the above problems.
  • a first aspect of the embodiment of the present application provides a pole piece having a longitudinal direction and a width direction perpendicular to each other, and one end of the pole piece in the length direction is a starting end, and the other end is a finishing end. end,
  • the pole piece is composed of a plurality of pole segments sequentially connected in the longitudinal direction, and two adjacent pole segments can collectively form a circle of the wound battery core.
  • the pole segments are divided into a plurality of categories, and the number of the pole segments of each category is several
  • the different types of the pole segments have different sizes in the width direction.
  • At least a portion of the pole piece can extend from the starting end to the trailing end along the length direction.
  • the type of the pole segment includes a first pole segment and a second pole segment
  • a dimension of the first pole segment in the width direction is larger than a dimension of the second pole segment in the width direction, and the first pole segment and the second pole segment are alternately arranged along the length direction cloth.
  • the type of the polar segments includes at least three types, and the polar segments of different kinds are sequentially reduced in size in the width direction, wherein the polar segments having the largest size along the width direction are a polar fragment,
  • the first pole segments are sequentially arranged along the length direction along a direction from the start end to the tail end,
  • a different kind of the pole segments exist between two adjacent first pole segments, and are in a direction from the start end to the tail end between two adjacent first pole segments In the pole segment, the dimension of the pole segment located in the front in the width direction is not smaller than the dimension of the pole segment located at the rear in the width direction.
  • the type of the pole segment includes a first pole segment, a second pole segment, and a third pole segment,
  • the dimensions of the first pole segment, the second pole segment, and the third pole segment in the width direction are sequentially decreased
  • the first pole segments are sequentially arranged along the length direction along a direction from the start end to the tail end,
  • Inserting one of the second pole segments or one of the third pole segments between two adjacent first pole segments, and the second pole segment is located along a direction from the start end to the tail end The front of the third pole segment.
  • the last one of the first pole segments is further connected with a pole piece having the smallest dimension along the width direction.
  • the size of the pole segments other than the first pole segment increases in the length direction, and the degree of increase is equal to the pole segment a loop between the wound core and another loop adjacent to the loop and located inside The variation of the circumference.
  • different kinds of the pole segments are arranged in sequence along the length direction.
  • the type of the pole segment includes a first pole segment and a second pole segment, the dimension of the first pole segment in the width direction being larger than the dimension of the second pole segment in the width direction,
  • the first pole segment is located in front of the second pole segment in a direction from the start end to the tail end.
  • the width of the pole piece is defined by the pole segments having the largest dimension along the width direction.
  • the different kinds of the pole segments are aligned or not aligned along one end of the width direction.
  • the size of at least one of the pole segments is uniform in the length direction, and the size of at least one of the pole segments in the length direction is sequentially increased, and the degree of increase is equal to the winding of the pole segment.
  • a second aspect of the embodiments of the present application provides a winding core, including the pole piece described above,
  • the pole segments of the same type are sequentially aligned along the thickness direction of the wound battery core, and each of the winding cores is surrounded by two adjacent pole segments Together constitute.
  • the winding core provided by the embodiment of the present application can form a wound core having a plurality of different thicknesses in the longitudinal direction of the wound core by directly adopting a pole piece including a plurality of different width sizes, thereby Improve the internal space utilization of the product and avoid the complicated splicing process in the related technology, which greatly simplifies the manufacturing process.
  • FIG. 1 is a schematic structural view of one of the pole pieces provided by the first embodiment of the present application.
  • FIG. 2 is a schematic structural view of a wound core formed by winding a pole piece shown in FIG. 1;
  • FIG. 3 is a schematic structural view of a battery core formed by the wound core package shown in FIG. 2;
  • FIG. 4 is a schematic structural view of another pole piece provided by the first embodiment of the present application.
  • Figure 5 is a schematic view showing the structure of a wound core formed by winding the pole piece shown in Figure 4;
  • FIG. 6 is a schematic structural view of a battery core formed by the wound battery core package shown in FIG. 5;
  • Figure 7 is a schematic structural view of one of the pole pieces provided by the second embodiment of the present application.
  • Figure 8 is a schematic structural view of a wound core formed by winding the pole piece shown in Figure 7;
  • FIG. 9 is a schematic structural view of a battery core formed by winding a battery core package shown in FIG. 8;
  • Figure 10 is a schematic view showing the structure of a modification in which the battery core of Figure 9 is formed by projecting a tab from a thicker side;
  • Figure 11 is a structural schematic view showing a modification of the electric core shown in Figure 9 in which the tabs are extended from the step surface;
  • FIG. 12 is a schematic structural diagram of another pole piece according to a second embodiment of the present application.
  • Figure 13 is a schematic view showing the structure of a wound core formed by winding the pole piece shown in Figure 12;
  • FIG. 14 is a schematic structural view of a battery core formed by the wound core package shown in FIG.
  • the embodiment of the present application provides a pole piece 1 for winding a battery core, and thus has a long strip structure, that is, a longitudinal direction and a width which are substantially perpendicular to each other.
  • the direction starts from the end of the pole piece in the length direction during the winding process, so the end is the starting end 10 and the other end is the ending end 11.
  • the pole piece 1 is composed of a plurality of pole segments sequentially connected in the longitudinal direction, and these pole segments are divided into a plurality of types, and the number of pole segments of each kind is not equal, according to the corresponding region of the battery cell to be wound.
  • Different kinds of pole segments have different sizes in the width direction, but at the same time, it is also ensured that at least a part of the regions on the pole piece 1 can extend from the starting end 10 to the finishing end 11 in the longitudinal direction, that is, the connection of the pole segments. At least a part of the portion in the width direction of the pole piece 1 is in the same interval range.
  • winding the wound core it is basically ensured that the same type of pole segments are sequentially along the thickness direction of the wound core. Aligned, and each turn of the wound cell is composed of two adjacent pole segments.
  • the distance between the winding core and the winding center is different, and the circumference of the winding core is also larger and larger, which requires that the pole piece is cut to form a pole piece.
  • the number of turns of the pole segments in the wound core in general, the larger the number of turns, the larger the size required for the pole segments, and therefore, the direction from the start end 10 to the end end 11, The size of the segments is generally increased in order. But this is not absolute. In general, a pole segment will form a half turn of the wound cell, so that the two pole segments together form a complete circle of the wound cell. At this time, the width of the cell is substantially the same. The size of the segments in the length direction remains the same.
  • the size of one of the pole segments can be kept constant, when such a pole segment and other kinds of pole segments together form a wound core
  • the change in the size of other types of pole segments includes a full turn of the circumference, and it is still possible to ensure that the same type of pole segments located in different turns are sequentially aligned along the thickness direction of the wound core.
  • the thickness is continuously increased as the winding progresses, eventually forming the thickest portion of the wound core.
  • the thickness and position of the region other than the thickest portion of the wound core are in accordance with the number of various pole segments and The positional relationship forms different thicknesses in the length direction of the wound battery core
  • the cells formed by winding are finally formed into a structure having a thickness different from that of a step in the longitudinal direction.
  • different types of pole segments may be sequentially arranged along the length direction. Specifically, as shown in FIG. 1 , taking two kinds of pole segments as the first pole segment 12 and the second pole segment 13 respectively, the size of the first pole segment 12 in the width direction is larger than that. The size of the dipole segment 13 in the width direction.
  • the first pole segment 12 is located in front of the second pole segment 13 in the direction from the start end 10 to the tail end 11. That is to say, starting from the starting end 10, firstly all of the first pole segments 12 are formed. After the first pole segments 12 reach the required number or length, the second pole segments 13 are arranged by cutting or the like until the second pole segments 13 are arranged. Close the end 11.
  • the width of the pole piece 1 is defined by the first pole segment 12, that is to say, the portion of the first pole segment 12 aligned with the second pole segment 13 as viewed along the length of the pole piece 1 and All of the regions in which the second pole segments 13 are formed together can extend from the starting end 10 to the finishing end 11. In some cases, there may be partial interleaving between several different pole segments, that is, different polar segments will partially extend beyond the other pole segments in the width direction as viewed along the length of the pole piece 1. . For example, the first pole segment 12 and the second pole segment 13 may be partially staggered.
  • the width of the pole piece 1 is no longer the width of the first pole segment 12, but the first pole segment 12 and the second pole segment 13 The sum of the dimensions of the portion of the first pole segment 12 is exceeded. Moreover, the width of the pole piece 1 is related to the degree of interlacing of the first pole segment 12 and the second pole segment 13 to meet different needs.
  • the second pole segment 13 may have one end aligned with the first pole segment 12 in the width direction (see FIG. 1), and the wound cell formed by this structure may be formed in the length direction.
  • a two-part structure of a and b having different thicknesses see FIGS. 2 and 3), wherein a thicker portion a is formed by a portion in which the first pole segment 12 is aligned with the second pole segment 13 and the second pole segment 13 is formed.
  • the thinner b-section is formed by winding only the remainder of the first pole segment 12.
  • neither ends of the second pole segment 13 in the width direction may be aligned with either end of the first pole segment 12 (see FIG. 4).
  • the formed wound core will form a c portion and two d portions in the length direction, In the middle portion c is the thickest portion, and on both sides of the c portion, a thin portion d is formed (see FIGS. 5 and 6), wherein the c portion is composed of the first pole segment 12 and the second portion.
  • the dipole segments 13 have remaining portions on both sides in the width direction, and the two d portions in the wound cells are wound by the remaining portions on the first pole segments 12.
  • the tab 2 After forming the wound core, it is necessary to assemble the tab 2, and in general, the tab 2 is assembled through the sealant 3 at the winding center of the wound core.
  • the thickness of each portion of the formed winding core in length is symmetrically arranged with respect to the winding center of the wound core.
  • the present application also provides another embodiment.
  • different kinds of pole segments may be alternately arranged along the length direction. Taking two different polar segments including the first pole segment 12 and the second pole segment 13 as an example, as shown in FIG. 7, the first pole segment 12 and the second pole segment 13 are alternately arranged in the length direction.
  • the width of the pole piece 1 is still defined by the first pole segment 12, while the second pole segment 13 has one end in the width direction aligned with the first pole segment 12.
  • the wound cell After forming the cell by winding, the wound cell will form two parts of thickness e, f in the length direction (see FIG. 8), wherein the thicker e portion is composed of the first pole segment 12 and the second pole. The portion where the segments 13 are aligned and the second pole segments 13 are formed together, while the thinner portion f is formed only by the remaining portion of the first pole segments 12.
  • the thinner portions are concentratedly distributed on one side of the winding center of the wound core, and are distributed in a lamination.
  • one side surface of the entire winding core is flush in the longitudinal direction, and the other side has a stepped structure.
  • the dimension of the pole piece 1 at the center of the winding should be greatest in the length direction of the wound core, and therefore, when the pole piece 1 is cut, along the starting end 10 to the finish In the direction of the end 11, the first pole segment 12 is first formed.
  • the tab 2 generally extends from the thinner side of the wound cell (see Figure 9), but in some cases it may also protrude from the thicker side of the wound cell (see Figure 10). Further, with such a step-like winding core, the tab 2 can also be extended by the step surface due to the presence of the stepped surface (see Fig. 11).
  • pole pieces containing more types such as three or more pole segments
  • the following can be used Arrangement in column mode: as shown in FIG. 12, taking the pole piece 1 including the first pole segment 12, the second pole segment 13 and the third pole segment 14 as an example, the first pole segment 12, the second pole segment 13 and The size of the third pole segment 14 decreases in the width direction, and the first pole segments 12 are sequentially arranged along the length direction along the direction from the start end 10 to the tail end 11, and between the adjacent two first pole segments 12
  • pole segment which may be the second pole segment 13 or the third pole segment 14, which is arranged in the following manner: in the direction from the starting end 10 to the ending end 11, at these first poles Among the polar segments between the segments 12, the dimension of the polar segment located in the front is not smaller than the dimension of the polar segment located at the rear in the width direction.
  • firstly arranged in the width direction is second only to the pole segment of the first pole segment 12, that is, the second pole segment 13, such that the pole segments inserted in front of each second pole segment 13 are second poles.
  • the segments 13 are equal in size in the width direction and are satisfactory.
  • the polar segments that are smaller in the width direction than the second pole segments 13 are arranged between the subsequent two first pole segments.
  • the third pole segment 14 is arranged at this time, and in other embodiments with more kinds of polar segments, the order of the polar segments in the width direction is sequentially arranged. Go down until the end 11 is closed.
  • the pole segments on the pole piece 1 are generally formed by cutting the entire pole piece substrate without being formed by splicing the pole pieces.
  • the dimensions of the first pole segment 12 in the length direction are always consistent, and the dimensions of the second pole segment 13 and the third pole segment 14 in the length direction are along the direction from the start end 10 to the tail end 11. Then, the amount of change per winding of the wound core is absorbed in order to ensure that the first pole segments 12 located at different turns are sequentially aligned in the thickness direction of the wound core.
  • the formed winding core is formed with three portions of thickness g, h, and i decreasing in thickness in the longitudinal direction, wherein the thickest g portion is The one-pole segment 12, the second-pole segment 13, and the third-pole segment 14 are collectively wound.
  • the middle portion h is formed by the first pole segment 12 and the second pole segment 13, and this portion exists in two forms, one being the second pole segment 13 and the first pole adjacent to the second pole segment 13.
  • the segment 12 is formed in a wound structure which is symmetrical with respect to the winding center of the wound core, and the other is a laminated structure formed by the first pole segment 12 adjacent to the third pole segment 14.
  • the lamination structure is formed from the outermost side of the wound core to the wound structure.
  • the last i-section is a laminated structure formed entirely of the first pole segments 12, from the outermost side of the wound core to the winding of the wound core. heart.
  • the last first pole segment 12 is further connected with a pole piece having the smallest dimension in the width direction.
  • it is a third pole segment 14.
  • the cells are formed by packaging.
  • the embodiment of the present application directly forms a wound core having a plurality of different thicknesses in the longitudinal direction by winding, thereby avoiding the complicated splicing process in the related art and greatly simplifying the manufacturing process.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

一种极片（1）及绕卷电芯，涉及储能器件领域。极片（1）存在相互垂直的长度方向以及宽度方向，且极片（1）在长度方向上的一端为起始端（10），另一端为收尾端（11），极片（1）由在长度方向上依次连接的多个极片段组成，极片段分为多个种类，每个种类的极片段的数量均为若干个，不同种类的极片段在宽度方向上的尺寸均不同，极片（1）至少存在一部分区域能够沿长度方向由起始端（10）延伸至收尾端（11）。绕卷电芯包括极片（1），绕卷电芯中，沿绕卷电芯的厚度方向，同一类型的极片段均依次对齐，绕卷电芯的每一圈均由相邻两个极片段共同构成。实施例所提供的绕卷电芯通过采用包括多种不同宽度尺寸的极片段，能够直接通过绕卷方式形成在长度方向上具有多段不同厚度的绕卷电芯。

Description

极片及绕卷电芯 技术领域
本申请涉及储能器件领域，尤其涉及一种极片及绕卷电芯。
背景技术
目前，电子技术飞速发展，集成化程度越来越高的工艺技术使手机、笔记本电脑、数码相机等移动电子设备不断朝着轻薄化发展，这些电子设备越来越小的内部空间使得对空间利用率的需求不断提高。尤其在轻薄笔记本电脑方面，以MacBook为代表的超轻薄刀锋型笔记本外形设计使得传统的规则四方体电芯设计无法满足其空间利用率的需求。新的异形电芯如台阶电芯的出现完美的解决了这个难题。
在目前的台阶电芯设计方案中，以LG为代表的叠片电芯制造方案有着天然优势。而卷绕制造工艺中，通常采用大小电芯拼接的方式来实现台阶型异形电芯。采用这种方式拼接的卷绕台阶电芯一方面制造工艺比较复杂，需要拼接不同尺寸的裸电芯，组装固定和极耳设计方面也比较繁琐；另一方面多个尺寸的卷绕电芯最外圈和最内圈的单面区也会降低整体电芯的能量密度。因此，需要开发一种简单易行，并且可以解决多次卷绕能量密度损失难题的卷绕台阶形电芯的方法。
发明内容
本申请提供了一种极片及绕卷电芯，能够解决上述问题。
本申请实施例的第一方面提供了一种极片，所述极片存在相互垂直的长度方向以及宽度方向，且所述极片在所述长度方向上的一端为起始端，另一端为收尾端，
所述极片由在所述长度方向上依次连接的多个极片段组成，相邻两个所述极片段能够共同构成绕卷电芯的一圈，
所述极片段分为多个种类，每个种类的所述极片段的数量均为若干 个，不同种类的所述极片段在所述宽度方向上的尺寸均不同，
所述极片至少存在一部分区域能够沿所述长度方向由所述起始端延伸至所述收尾端。
优选地，所述极片段的种类包括第一极片段以及第二极片段，
所述第一极片段在所述宽度方向上的尺寸大于所述第二极片段在所述宽度方向上的尺寸，所述第一极片段与所述第二极片段沿所述长度方向交替排布。
优选地，所述极片段的种类至少包括三种，且不同种类的所述极片段沿所述宽度方向的尺寸依次减小，其中，沿所述宽度方向的尺寸最大的所述极片段为第一极片段，
沿所述起始端至所述收尾端的方向，所述第一极片段沿所述长度方向依次间隔排布，
相邻两个所述第一极片段之间均存在一个不同种类的所述极片段，且沿所述起始端至所述收尾端的方向，处于相邻两个所述第一极片段之间的所述极片段中，位于前方的所述极片段沿所述宽度方向的尺寸不小于位于后方的所述极片段沿所述宽度方向的尺寸。
优选地，所述极片段的种类包括第一极片段、第二极片段以及第三极片段，
所述第一极片段、所述第二极片段以及所述第三极片段在所述宽度方向上的尺寸依次减小，
沿所述起始端至所述收尾端的方向，所述第一极片段沿所述长度方向依次间隔排布，
相邻两个所述第一极片段之间均插入一个所述第二极片段或一个所述第三极片段，且沿所述起始端至所述收尾端的方向，所述第二极片段位于所述第三极片段的前方。
优选地，沿所述起始端至所述收尾端的方向，最后一个所述第一极片段之后还连接有一个沿所述宽度方向的尺寸最小的所述极片段。
优选地，沿所述起始端至所述收尾端的方向，除所述第一极片段以外的所述极片段，在所述长度方向上的尺寸依次增大，且增大程度等于该极片段在绕卷电芯内所处的一圈和与该圈相邻且位于内侧的另一圈之间的 周长变化量。
优选地，不同种类的所述极片段沿所述长度方向依次排布。
优选地，所述极片段的种类包括第一极片段以及第二极片段，所述第一极片段在所述宽度方向上的尺寸大于所述第二极片段在所述宽度方向上的尺寸，
沿所述起始端至所述收尾端的方向，所述第一极片段位于所述第二极片段的前方。
优选地，所述极片的宽度由沿所述宽度方向的尺寸最大的所述极片段所界定。
优选地，不同种类的所述极片段沿所述宽度方向的其中一端对齐或不对齐。
优选地，至少一种所述极片段在所述长度方向上的尺寸一致，至少一种所述极片段在所述长度方向上的尺寸依次增大，且增大程度等于该极片段在绕卷电芯内所处的一圈和与该圈相邻且位于内侧的另一圈之间的周长变化量。
本申请实施例的第二方面提供了一种绕卷电芯，包括上述的极片，
所述绕卷电芯中，沿所述绕卷电芯的厚度方向，同一类型的所述极片段均依次对齐，所述绕卷电芯的每一圈均由相邻两个所述极片段共同构成。
本申请实施例提供的技术方案可以达到以下有益效果：
本申请实施例所提供的绕卷电芯通过采用包括多种不同宽度尺寸的极片段，能够直接通过绕卷方式形成在绕卷电芯的长度方向上具有多段不同厚度的绕卷电芯，从而提升产品内部空间利用率，避免采用相关技术中复杂的拼接工艺，大幅简化了制造工艺。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性的，并不能限制本申请。
附图说明
图1为本申请第一个实施例所提供的其中一种极片的结构示意图；
图2为图1所示极片所绕卷形成的绕卷电芯的结构示意图；
图3为图2所示绕卷电芯封装形成的电芯的结构示意图；
图4为本申请第一个实施例所提供的另一种极片的结构示意图；
图5为图4所示极片所绕卷形成的绕卷电芯的结构示意图；
图6为图5所示绕卷电芯封装形成的电芯的结构示意图；
图7为本申请第二个实施例所提供的其中一种极片的结构示意图；
图8为图7所示极片所绕卷形成的绕卷电芯的结构示意图；
图9为图8所示绕卷电芯封装形成的电芯的结构示意图；
图10为图9所示电芯将极耳由较厚的一侧伸出所形成的变形例的结构示意图；
图11为图9所示电芯将极耳由台阶面伸出所形成的变形例的结构示意图；
图12为本申请第二个实施例所提供的另一种极片的结构示意图；
图13为图12所示极片所绕卷形成的绕卷电芯的结构示意图；
图14为图13所示绕卷电芯封装形成的电芯的结构示意图。
附图标记：
1-极片；
10-起始端；
11-收尾端；
12-第一极片段；
13-第二极片段；
14-第三极片段；
2-极耳；
3-密封胶。
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
具体实施方式
下面通过具体的实施例并结合附图对本申请做进一步的详细描述。文中所述“前”、“后”、“左”、“右”、“上”、“下”均以附图中的极片或绕卷电芯为参照。
如图1至14所示，本申请实施例提供了一种极片1，该极片1用于绕卷电芯，因此为长条状结构，也就是存在明显地相互垂直的长度方向以及宽度方向，在绕卷过程中会由极片在长度方向上的一端开始，因此该端为起始端10，另一端便为收尾端11。
极片1由在长度方向上依次连接的多个极片段组成，这些极片段分为多个种类，每个种类的极片段的数量不等，根据所要绕卷成形的电芯的对应区域所需的厚度而定，一般情况下的数量都不止一个。不同种类的极片段在宽度方向上的尺寸均不同，但同时还要保证极片1上至少存在一部分区域能够沿长度方向由起始端10延伸至收尾端11，也就是说，这些极片段的连接部位在极片1的宽度方向上均至少有一部分处于同一个区间范围内，在绕卷形成绕卷电芯时，基本上要保证沿绕卷电芯的厚度方向，同一类型的极片段均依次对齐，并且，绕卷电芯的每一圈均由相邻两个极片段共同构成。
但随着电芯绕卷的进行，绕卷电芯每一圈距绕卷中心的距离均不相同，其周长也会越来越大，这就要求在进行极片裁切形成极片段时要考虑到极片段在绕卷电芯中所处的圈数，一般而言，圈数越大，极片段所需要的尺寸就越大，因此，沿起始端10至收尾端11的方向，极片段的尺寸一般是要依次增大的。但这并不绝对，一般情况下，一个极片段会构成绕卷电芯的半圈，这样两个极片段共同构成绕卷电芯的完整一圈，此时，电芯的宽度基本上与极片段在长度方向上的尺寸保持一致。然而，对于由不同种类的极片段构成的绕卷电芯而言，如果能够保持其中一种极片段的尺寸始终不变，当这种极片段与其它种类的极片段共同组成绕卷电芯的一圈时，使其它种类的极片段的尺寸变化包含一整圈的周长变化量，依然能够保证沿绕卷电芯的厚度方向，位于不同圈的同一类型的极片段均依次对齐。
由于该部分由起始端10至收尾端11始终存在实体，因此随着绕卷的进行会持续地增加厚度，最终形成绕卷电芯上最厚的一部分。
而由于各极片段在宽度方向上的尺寸不同，因此在绕卷电芯中，位于绕卷电芯上最厚的这部分区域以外的其它区域的厚度以及位置会依照各种极片段的数量以及位置关系在绕卷电芯的长度方向上形成不同厚度的 部分，最终使绕卷形成的电芯在长度方向上形成厚度不一类似于台阶状的结构。
在本申请中，根据所需要形成的绕卷电芯的具体结构，极片1上的不同种类的极片段之间可以采用不同的排布方式，下面会进行详细介绍。
在本申请的一个实施例中，不同种类的极片段可以沿长度方向依次排布。具体地，如图1所示，以包含两种极片段为例，这两种极片段分别为第一极片段12以及第二极片段13，第一极片段12在宽度方向上的尺寸大于第二极片段13在宽度方向上的尺寸。沿起始端10至收尾端11的方向，第一极片段12位于第二极片段13的前方。也就是说，由起始端10开始，首先全部由第一极片段12构成，当第一极片段12达到所需数量或长度后，再开始通过裁切等方式排布第二极片段13，直至收尾端11。
在该实施例中，极片1的宽度由第一极片段12所界定，也就是说，沿极片1的长度方向看，第一极片段12上与第二极片段13对齐的这一部分以及所有的第二极片段13一起构成的区域能够由起始端10延伸至收尾端11。在某些情形下，几种不同的极片段之间可能存在部分交错的情形，也就是说，沿着极片1的长度方向看，不同的极片段在宽度方向上均会部分超出其它极片段。例如，第一极片段12和第二极片段13可以部分交错，此时，极片1的宽度便不再是第一极片段12的宽度，而是第一极片段12与第二极片段13超出第一极片段12的部分的尺寸之和。并且，极片1的宽度与第一极片段12和第二极片段13的交错程度相关，用以满足不同的需求。
下面仍然以极片1的宽度由第一极片段12所界定的实施例进行说明。在该实施例的一个方案中，第二极片段13在宽度方向上可以有一端与第一极片段12对齐(参见图1)，这种结构所形成的绕卷电芯会在长度方向上形成厚度不一的a、b两部分结构(参见图2和3)，其中，较厚的a部分由第一极片段12与第二极片段13对齐的部分以及第二极片段13一起形成，而较薄的b部分则仅由第一极片段12的剩余部分绕卷形成。
除此之外，在该实施例的另一个方案中，第二极片段13在宽度方向上的两端也可以均不与第一极片段12的任何一端对齐(参见图4)，这种结构所形成的绕卷电芯会在长度方向上形成一个c部分和两个d部分，其 中，位于中部c部分为最厚的部分，而在c部分的两侧则分别形成一个厚度较薄的d部分(参见图5和6)，其中，c部分由第一极片段12与第二极片段13对齐的部分以及第二极片段13一起形成，由于第二极片段13在宽度方向上的两端均未与第一极片段12的任何一端对齐，因此第一极片段12相对于第二极片段13在宽度方向的两侧均留有剩余部分，而绕卷电芯中的两个d部分则由第一极片段12上的这些剩余部分绕卷形成。
形成绕卷电芯后，需要装配极耳2，一般情况下极耳2会通过密封胶3装配在绕卷电芯的绕卷中心。
本实施例所提供的方案中，所形成的绕卷电芯在长度上的各部分厚度均相对于绕卷电芯的绕卷中心对称排布。
为了满足客户对绕卷电芯结构的不同需求，本申请还提供了另一个实施例。在该实施例中，不同种类的极片段可以沿长度方向交替排布。仍然以包含第一极片段12和第二极片段13这两种不同的极片段为例，如图7所示，第一极片段12与第二极片段13沿长度方向交替排布。在该实施例中，极片1的宽度仍然由第一极片段12所界定，同时，第二极片段13在宽度方向上有一端与第一极片段12对齐。
在绕卷形成电芯后，绕卷电芯会在长度方向上形成厚度不一的e、f两部分(参见图8)，其中，较厚的e部分由第一极片段12与第二极片段13对齐的部分以及第二极片段13一起形成，而较薄的f部分则仅由第一极片段12的剩余部分绕卷形成。然而，在这一实施例中，较薄部分集中分布在绕卷电芯的绕卷中心的一侧，并且呈叠片状分布。而绕卷电芯整体的一侧表面在长度方向上齐平，而另一侧则呈台阶状结构。
为了便于在绕卷中心位置设置极耳2，极片1在绕卷中心位置的尺寸在绕卷电芯的长度方向上应当最大，因此，在极片1裁切时，沿起始端10至收尾端11的方向，首先形成的是第一极片段12。
极耳2一般会由绕卷电芯较薄的一侧伸出(参见图9)，但某些情形下，也可以由绕卷电芯较厚的一侧伸出(参见图10)。此外，对于这种类似于阶梯状的绕卷电芯，由于存在阶梯面，因此极耳2也可以由阶梯面伸出(参见图11)。
对于包含更多种类，例如三种或三种以上极片段的极片，可以采用下 列方式进行排布：如图12所示，以包含第一极片段12、第二极片段13和第三极片段14的极片1为例，第一极片段12、第二极片段13和第三极片段14沿宽度方向的尺寸依次减小，沿起始端10至收尾端11的方向，第一极片段12沿长度方向依次间隔排布，而相邻两个第一极片段12之间均存在一个不同种类的极片段，可能是第二极片段13，也可能是第三极片段14，具体排布依照下述方式：沿起始端10至收尾端11的方向，处于这些第一极片段12之间的极片段中，位于前方的极片段沿宽度方向的尺寸应不小于位于后方的极片段沿宽度方向的尺寸。即首先排布的是沿宽度方向的尺寸仅次于第一极片段12的极片段，也就是第二极片段13，这样每个第二极片段13前方被插入的极片段均为第二极片段13，在沿宽度方向的尺寸相等，符合要求。待第二极片段13的数量满足需求后，在后续的两个第一极片段之间开始排布比第二极片段13在宽度方向上更小一些的极片段，在本实施例中，由于仅存在三种极片段，因此此时排布的是第三极片段14，而在其它一些拥有更多种类极片段的实施例中，将按照各极片段在宽度方向上的尺寸排序依次排布下去，直至收尾端11。需要注意的是，极片1上的各极片段一般是通过对极片基材整体裁切形成，而并不通过各极片段拼接形成。
在该实施例中，为了第一极片段12在长度方向上的尺寸始终保持一致，而沿起始端10至收尾端11的方向，第二极片段13和第三极片段14在长度方向的尺寸则依次增大，以此来吸收绕卷电芯每圈的变化量，从而保证位于不同圈的第一极片段12沿绕卷电芯的厚度方向依次对齐。
如图13和14所示，上述极片1进行绕卷后，所形成的绕卷电芯沿长度方向形成厚度依次递减的g、h、i三个部分，其中，最厚的g部分由第一极片段12、第二极片段13以及第三极片段14共同绕卷形成。中间的h部分由第一极片段12和第二极片段13绕卷形成，并且，这一部分存在两种形式，一种是由第二极片段13和与第二极片段13邻接的第一极片段12共同形成的绕卷结构，该绕卷结构相对于绕卷电芯的绕卷中心对称，而另一种则是由与第三极片段14邻接的第一极片段12形成的叠片结构，该叠片结构由绕卷电芯的最外侧直至绕卷结构。最后的i部分则是完全由第一极片段12形成的叠片结构，由绕卷电芯的最外侧直至绕卷电芯的绕卷中 心。
此外，为了简化收尾结构，在极片1裁切时，沿起始端10至收尾端11的方向，最后一个第一极片段12之后还连接有一个沿宽度方向的尺寸最小的极片段，在本实施例中为第三极片段14。
在本申请各实施例所提供的绕卷电芯形成后，通过封装形成电芯。
本申请实施例通过绕卷方式直接形成在长度方向上具有多段不同厚度的绕卷电芯，从而避免采用相关技术中复杂的拼接工艺，大幅简化了制造工艺。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化，基于本申请所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (10)

  1. 一种极片，其特征在于，所述极片存在相互垂直的长度方向以及宽度方向，且所述极片在所述长度方向上的一端为起始端，另一端为收尾端，
    所述极片由在所述长度方向上依次连接的多个极片段组成，相邻两个所述极片段能够共同构成绕卷电芯的一圈，
    所述极片段分为多个种类，每个种类的所述极片段的数量均为若干个，不同种类的所述极片段在所述宽度方向上的尺寸均不同，
    所述极片至少存在一部分区域能够沿所述长度方向由所述起始端延伸至所述收尾端。
  2. 如权利要求1所述的极片，其特征在于，所述极片段的种类包括第一极片段以及第二极片段，
    所述第一极片段在所述宽度方向上的尺寸大于所述第二极片段在所述宽度方向上的尺寸，所述第一极片段与所述第二极片段沿所述长度方向交替排布。
  3. 如权利要求1所述的极片，其特征在于，所述极片段的种类至少包括三种，且不同种类的所述极片段沿所述宽度方向的尺寸依次减小，其中，沿所述宽度方向的尺寸最大的所述极片段为第一极片段，
    沿所述起始端至所述收尾端的方向，所述第一极片段沿所述长度方向依次间隔排布，
    相邻两个所述第一极片段之间均存在一个不同种类的所述极片段，且沿所述起始端至所述收尾端的方向，处于相邻两个所述第一极片段之间的所述极片段中，位于前方的所述极片段沿所述宽度方向的尺寸不小于位于后方的所述极片段沿所述宽度方向的尺寸。
  4. 如权利要求3所述的极片，其特征在于，所述极片段的种类包括第一极片段、第二极片段以及第三极片段，
    所述第一极片段、所述第二极片段以及所述第三极片段在所述宽度方向上的尺寸依次减小，
    沿所述起始端至所述收尾端的方向，所述第一极片段沿所述长度方向 依次间隔排布，
    相邻两个所述第一极片段之间均插入一个所述第二极片段或一个所述第三极片段，且沿所述起始端至所述收尾端的方向，所述第二极片段位于所述第三极片段的前方。
  5. 如权利要求3或4所述的极片，其特征在于，沿所述起始端至所述收尾端的方向，最后一个所述第一极片段之后还连接有一个沿所述宽度方向的尺寸最小的所述极片段。
  6. 如权利要求3或4所述的极片，其特征在于，沿所述起始端至所述收尾端的方向，除所述第一极片段以外的所述极片段，在所述长度方向上的尺寸依次增大，且增大程度等于该极片段在绕卷电芯内所处的一圈和与该圈相邻且位于内侧的另一圈之间的周长变化量。
  7. 如权利要求1所述的极片，其特征在于，不同种类的所述极片段沿所述长度方向依次排布。
  8. 如权利要求7所述的极片，其特征在于，所述极片段的种类包括第一极片段以及第二极片段，所述第一极片段在所述宽度方向上的尺寸大于所述第二极片段在所述宽度方向上的尺寸，
    沿所述起始端至所述收尾端的方向，所述第一极片段位于所述第二极片段的前方。
  9. 如权利要求1所述的极片，其特征在于，至少一种所述极片段在所述长度方向上的尺寸一致，至少一种所述极片段在所述长度方向上的尺寸依次增大，且增大程度等于该极片段在绕卷电芯内所处的一圈和与该圈相邻且位于内侧的另一圈之间的周长变化量。
  10. 一种绕卷电芯，其特征在于，包括权利要求1至9任一项所述的极片，
    所述绕卷电芯中，沿所述绕卷电芯的厚度方向，同一类型的所述极片段均依次对齐，所述绕卷电芯的每一圈均由相邻两个所述极片段共同构成。
PCT/CN2016/105873 2016-10-25 2016-11-15 极片及绕卷电芯 Ceased WO2018076410A1 (zh)

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