WO2013097510A1 - 一种锂离子电池、锂离子电池芯及其制作方法 - Google Patents

一种锂离子电池、锂离子电池芯及其制作方法 Download PDF

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Publication number
WO2013097510A1
WO2013097510A1 PCT/CN2012/082400 CN2012082400W WO2013097510A1 WO 2013097510 A1 WO2013097510 A1 WO 2013097510A1 CN 2012082400 W CN2012082400 W CN 2012082400W WO 2013097510 A1 WO2013097510 A1 WO 2013097510A1
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strip
positive electrode
lithium ion
ion battery
shaped
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PCT/CN2012/082400
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English (en)
French (fr)
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张光辉
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华为技术有限公司
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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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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 invention belongs to the technical field of lithium ion battery production processes, in particular to a lithium ion battery, a lithium ion battery core and a manufacturing method thereof.
  • lithium-ion batteries are widely used in energy storage, transportation, communications and other fields. Accordingly, users have higher performances on capacity, rate, and cycle performance of lithium-ion batteries. Claim.
  • the current lithium ion battery core is divided into a wound lithium ion battery core and a laminated lithium ion battery core according to different manufacturing processes.
  • the wound lithium ion battery cell is formed by laminating a positive electrode sheet, a separator, a negative electrode sheet and a separator in sequence, and is wound by a winder, and the positive electrode sheet and the negative electrode sheet are required to not exceed the width of the separator during the winding process.
  • the positive and negative electrodes should be aligned and must not be misaligned. Because of the disadvantage of large current discharge, the capacity of the wound lithium ion battery cell is small. Therefore, in practical applications, a laminated lithium ion battery cell is often used.
  • a laminated lithium ion battery core provided by the prior art is obtained by punching a positive electrode sheet into a plurality of monolithic positive electrodes, punching the negative electrode sheets into a plurality of monolithic negative electrodes, and forming a monolithic positive electrode and a monolithic negative electrode. After the separator bag of the corresponding size is placed, a separator bag in which a single positive electrode is placed and a separator bag in which a single negative electrode is placed are alternately stacked.
  • the laminated lithium ion battery cell needs to separately produce a diaphragm bag in which a sheet-shaped positive electrode is placed and a separator bag in which a single-piece negative electrode is placed, which is inefficient in production.
  • the laminated lithium ion battery core is manufactured by first punching a positive electrode sheet into a plurality of monolithic positive electrodes and punching the negative electrode sheets. Cutting into a plurality of monolithic negative electrodes, and sealing a plurality of monolithic positive electrodes arranged at intervals or a plurality of monolithic negative electrodes arranged at intervals between the two separators to form a pole piece diaphragm strip bag, and then The pole piece diaphragm strip is Z-folded, and a plurality of single-piece negative electrodes or a plurality of single-plate positive electrodes are placed between two adjacent folding units of the pole piece diaphragm strip bag, thereby assembling a laminated lithium ion battery cell.
  • the above two laminated lithium ion battery cores provided by the prior art need to be punched separately for the positive electrode and the negative electrode during the manufacturing process, and the punching process easily causes the polar dressing containing the active material to fall off. , so that the product's non-performing rate is higher.
  • the above two laminated lithium ion battery cells are in the process of manufacturing, a plurality of monolithic positive electrodes and a plurality of monolithic negative electrodes are respectively aligned, thereby improving the control difficulty of the alignment accuracy of the pole pieces and reducing the product.
  • Productivity since the above two laminated lithium ion battery cells are in the process of manufacturing, a plurality of monolithic positive electrodes and a plurality of monolithic negative electrodes are respectively aligned, thereby improving the control difficulty of the alignment accuracy of the pole pieces and reducing the product.
  • the object of the present invention is to provide a lithium ion battery core, which aims to solve the problem that the laminated lithium ion battery core provided by the prior art needs to be punched separately for the positive electrode and the negative electrode during the manufacturing process, which may cause the polar dressing to fall off.
  • the present invention is achieved by a lithium ion battery cell comprising a plurality of monolithic first polar sheets and a wound second polarity diaphragm strip bag, the plurality of single sheets
  • the first polar sheets are respectively aligned with each other in the adjacent wound layer interval of the wound second polarity diaphragm strip bag;
  • the wound second polarity diaphragm strip bag includes a first diaphragm, a strip-shaped second polarity sheet, and a second diaphragm that are sequentially stacked, and the first polarity and the second polarity are not the same.
  • the embodiment of the invention further provides a method for fabricating a lithium ion battery cell as described above, the method comprising the following steps:
  • the first separator, the strip-shaped second polar sheet, and the second separator are sequentially laminated and wound;
  • the plurality of monolithic first polar sheets are aligned with each other in the adjacent wound layer interval after winding.
  • Embodiments of the present invention also provide a lithium ion battery including a lithium ion battery cell as described above.
  • the lithium ion battery core provided by the invention combines the advantages of the roll type and the lamination type, and compared with the prior art, only the first polarity piece is punched in the manufacturing process, and the strip shape is not required.
  • the polar sheet is punched, thereby greatly reducing the peeling of the polar dressing during the punching process, and reducing the resulting product defect rate; in addition, it is only necessary to apply a plurality of monolithic first polar sheets during the manufacturing process.
  • the alignment control is performed, thereby reducing the difficulty of controlling the alignment precision of the pole piece and improving the production efficiency of the product.
  • FIG. 1 is a winding sectional view of a lithium ion battery cell according to a first embodiment of the present invention
  • Figure 2 is a front elevational view of the strip-shaped negative electrode tab of Figure 1;
  • Figure 3 is a front elevational view of the monolithic positive electrode of Figure 1;
  • FIG. 4 is a winding sectional view of a lithium ion battery cell according to a second embodiment of the present invention.
  • Figure 5 is a front elevational view of the strip-shaped positive electrode tab of Figure 4.
  • FIG. 6 is a flow chart of a method for fabricating a lithium ion battery cell provided by the present invention.
  • the lithium ion battery core provided by the present invention combines a strip-shaped polar sheet with a plurality of monolithic polar sheets, so that only one polar sheet is required in the manufacturing process. Cutting.
  • the lithium ion battery core provided by the present invention comprises a plurality of monolithic first polar sheets and a wound second polarity diaphragm strip, and the plurality of monolithic first polar sheets are respectively aligned with each other.
  • the wound second polarity diaphragm strip bag comprises a first diaphragm, a strip-shaped second polar sheet, which are sequentially stacked, And a second diaphragm, and the first polarity is different from the second polarity.
  • the lithium ion battery core provided by the invention combines the advantages of the roll type and the lamination type, and compared with the prior art, only the first polarity piece is punched in the manufacturing process, and the strip shape is not required.
  • the polar sheet is punched, thereby greatly reducing the peeling of the polar dressing during the punching process, and reducing the resulting product defect rate; in addition, it is only necessary to apply a plurality of monolithic first polar sheets during the manufacturing process.
  • the alignment control is performed, thereby reducing the difficulty of controlling the alignment precision of the pole piece and improving the production efficiency of the product.
  • FIG. 1 shows a winding cross section of the lithium ion battery cell provided by the first embodiment of the present invention. For the convenience of description, only the first embodiment of the present invention is shown. A portion related to an embodiment.
  • the lithium ion battery cell provided by the first embodiment of the present invention comprises a plurality of monolithic positive electrodes 11 and a wound negative electrode strip strip, and a plurality of monolithic positive electrodes 11 are respectively aligned with each other in the wound negative separator strip.
  • the adjacent wound layer of the bag is spaced apart; the wound negative separator strip bag includes a first separator 13, a strip negative electrode 12, and a second separator 14, which are sequentially stacked.
  • Fig. 2 is a front elevational view of the strip-shaped negative electrode tab 12 of Fig. 1
  • Fig. 3 is a front elevational view of the monolithic positive electrode 11 of Fig. 1.
  • the strip-shaped negative electrode sheet 12 includes a strip-shaped current collector having a coating area 121 and an uncoated area uniformly distributed in a direction perpendicular to the winding direction of the strip-shaped current collector. 122, the coating zone 121 is coated with a negative electrode dressing, and the uncoated zone 122 is a negative electrode tab from the tape-shaped current collector winding start end to the winding end end.
  • the positive electrode tabs 123 are drawn from the monolithic positive electrode 11, and each of the monolithic positive electrodes 11 leads to a positive electrode tab 123.
  • the positive electrode tab 123 is led out in the direction in which the negative electrode tabs are led out and in the banded set.
  • the direction in which the fluid is wound is perpendicular, and the positive electrode tab 123 and the negative electrode tab are distributed on both sides of the strip-shaped current collector winding direction.
  • the embodiment of the invention further provides a lithium ion battery comprising a lithium ion battery cell as described in the first embodiment of the invention.
  • FIG. 4 shows the winding cross section of the lithium ion battery cell provided by the second embodiment of the present invention. For the convenience of description, only the first embodiment of the present invention is shown. The parts related to the second embodiment.
  • a lithium ion battery cell includes a plurality of monolithic negative electrodes 21 and a wound positive electrode strip strip, and a plurality of monolithic negative electrodes 21 are respectively aligned with each other on the wound positive separator strip.
  • the adjacent wound layer of the bag is spaced apart; the wound positive separator strip bag includes a first separator 13, a strip-shaped positive electrode 22, and a second separator 14, which are sequentially stacked.
  • Figure 5 is a front elevational view of the strip-shaped positive electrode sheet 22 of Figure 4 .
  • the strip-shaped positive electrode sheet 22 includes a strip-shaped current collector, and a positive electrode dressing 221 which is applied to the surface of the strip-shaped current collector portion in the winding direction of the strip-shaped current collector, each of the strip-shaped current collectors
  • the spacer regions 222 coated with the positive electrode dressing 221 respectively lead to a positive electrode tab, and the lithium ion battery cell is at the leading end of the positive electrode tab, and the negative electrode tab is taken out at the same time.
  • the application region of the positive electrode dressing 221 corresponds to the single-sheet negative electrode 21 placement region.
  • the embodiment of the invention further provides a lithium ion battery comprising a lithium ion battery cell as described in the second embodiment of the invention.
  • FIG. 6 shows a flow of a method for fabricating a lithium ion battery cell provided by the present invention.
  • step S101 the first polar sheet is die-cut into a plurality of monolithic first polar sheets.
  • step S102 the first separator, the strip-shaped second polar sheet, and the second separator are sequentially laminated and wound.
  • step S103 a plurality of monolithic first polar sheets are aligned with each other in the adjacent wound layer interval after winding.
  • the storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).
  • the monolithic first polar sheet is a monolithic positive electrode
  • the wound second polarity diaphragm strip is a wound negative separator strip bag, a strip-shaped second polar sheet. It is a strip negative electrode.
  • the structure of the strip-shaped negative electrode sheet is as shown in FIG. 2, and the structure of the monolithic positive electrode is as shown in FIG. 3, and details are not described herein again.
  • the monolithic first polar sheet is a monolithic negative electrode
  • the wound second polarity diaphragm strip is a wound positive separator strip pouch, strip second polarity
  • the sheet is a strip of positive electrode.
  • the structure of the strip-shaped positive electrode sheet is as shown in FIG. 5 and will not be described herein.
  • the lithium ion battery core provided by the invention combines the advantages of the roll type and the lamination type, and compared with the prior art, only the first polarity piece is punched in the manufacturing process, and the strip shape is not required.
  • the polar sheet is punched, thereby greatly reducing the peeling of the polar dressing during the punching process, and reducing the resulting product defect rate; in addition, it is only necessary to apply a plurality of monolithic first polar sheets during the manufacturing process.
  • the alignment control is performed, thereby reducing the difficulty of controlling the alignment precision of the pole piece and improving the production efficiency of the product.

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  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

本发明适用于锂离子电池生产工艺技术领域，提供了一种锂离子电池、锂离子电池芯及其制作方法。其中的锂离子电池芯包括多个单片状第一极性片以及一卷绕式第二极性隔膜条袋，多个单片状第一极性片分别相互对齐排布于卷绕式第二极性隔膜条袋的相邻卷绕层间隔中；卷绕式第二极性隔膜条袋包括顺次叠放的第一隔膜、带状第二极性片以及第二隔膜，且第一极性与第二极性不相同。本发明的锂离子电池芯结合了卷绕式和叠片式的优点，相对于现有技术，其在制作过程中只需对第一极性片进行冲切，而无需对带状第二极性片进行冲切，从而大幅减少了冲切过程中极性敷料的脱落，降低了由此导致的产品不良率，且降低了极片的对齐精度控制难度，提高了产品的生产效率。

Description

一种锂离子电池、锂离子电池芯及其制作方法 技术领域
本发明属于锂离子电池生产工艺技术领域，尤其涉及一种锂离子电池、锂离子电池芯及其制作方法。
 背景技术
随着社会的发展以及人们对能源的日益重视，锂离子电池被广泛应用于储能、交通、通讯等领域，相应地，用户对锂离子电池的容量、倍率、循环等性能提出了更高的要求。
目前的锂离子电池芯根据制作工艺的不同而分为卷绕式锂离子电池芯和叠片式锂离子电池芯。其中，卷绕式锂离子电池芯是将正极片、隔膜、负极片、隔膜依次层叠后，利用卷绕机卷绕而成，卷绕过程中要求正极片和负极片均不得超出隔膜的宽度，且正极片和负极片应对齐而不得错位。由于不利于大电流放电，使得卷绕式锂离子电池芯的容量较小，因此，实际应用中，多采用叠片式锂离子电池芯。
现有技术提供的一种叠片式锂离子电池芯是将正极片冲切成若干单片状正极，将负极片冲切成若干单片状负极，并将单片状正极和单片状负极放入相应尺寸的隔膜袋后，将放有单片状正极的隔膜袋和放有单片状负极的隔膜袋交替叠放而制成的。但该种叠片式锂离子电池芯需要分别制作放置有片状正极的隔膜袋和放置单片状负极的隔膜袋，生产效率低下。
为此，现有技术提供了另一种叠片式锂离子电池芯，该种叠片式锂离子电池芯的制作过程是：先将正极片冲切成若干单片状正极，将负极片冲切成若干单片状负极，通过热压方式将间隔排布的若干单片状正极或间隔排布的若干单片状负极封装于两片隔膜之间以形成极片隔膜条袋，之后将该极片隔膜条袋进行Z型折叠，并将若干单片状负极或若干单片状正极置于极片隔膜条袋的两相邻折叠单元之间，从而组装成叠片式锂离子电池芯。
可以看出，现有技术提供的如上两种叠片式锂离子电池芯均需在制作过程中对正极片和负极片分别进行冲切，而冲切过程易导致含有活性物质的极性敷料脱落，而使得产品的不良率较高。同时，由于如上两种叠片式锂离子电池芯在制作过程中，需分别对若干单片状正极和若干单片状负极进行对齐，从而提高了极片对齐精度的控制难度，降低了产品的生产效率。
 技术问题
本发明的目的在于提供一种锂离子电池芯，旨在解决现有技术提供的叠片式锂离子电池芯需在制作过程中对正极片和负极片分别进行冲切，易导致极性敷料脱落，而使得产品不良率较高，且对齐精度的控制难度大的问题。
 技术解决方案
本发明是这样实现的，一种锂离子电池芯，所述锂离子电池芯包括多个单片状第一极性片以及一卷绕式第二极性隔膜条袋，所述多个单片状第一极性片分别相互对齐排布于所述卷绕式第二极性隔膜条袋的相邻卷绕层间隔中；
所述卷绕式第二极性隔膜条袋包括顺次叠放的第一隔膜、带状第二极性片、以及第二隔膜，且所述第一极性与所述第二极性不相同。
本发明实施例还提供了一种如上所述的锂离子电池芯的制作方法，所述方法包括以下步骤：
将第一极性片冲切成多个单片状第一极性片；
将第一隔膜、带状第二极性片、第二隔膜顺次层叠后卷绕；
将所述多个单片状第一极性片相互对齐排布于卷绕后的相邻卷绕层间隔中。
本发明实施例还提供了一种锂离子电池，所述锂离子电池包括一如上所述的锂离子电池芯。
 有益效果
本发明提供的锂离子电池芯结合了卷绕式和叠片式的优点，相对于现有技术，其在制作过程中只需对第一极性片进行冲切，而无需对带状第二极性片进行冲切，从而大幅减少了冲切过程中极性敷料的脱落，降低了由此导致的产品不良率；另外，其制作过程中只需对多个单片状第一极性片进行对齐控制，从而降低了极片的对齐精度控制难度，提高了产品的生产效率。
 附图说明
图1是本发明第一实施例提供的锂离子电池芯的卷绕截面图；
图2是图1中带状负极片的正视图；
图3是图1中单片状正极的正视图；
图4是本发明第二实施例提供的锂离子电池芯的卷绕截面图；
图5是图4中带状正极片的正视图；
图6是本发明提供的锂离子电池芯的制作方法流程图。
 本发明的实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
为了克服现有技术存在的问题，本发明提供的锂离子电池芯将带状极性片与多个单片状极性片结合，从而使得其在制作过程中，只需对一个极性片进行切割。
具体地，本发明提供的锂离子电池芯包括多个单片状第一极性片以及一卷绕式第二极性隔膜条袋，多个单片状第一极性片分别相互对齐排布于该卷绕式第二极性隔膜条袋的相邻卷绕层间隔中，该卷绕式第二极性隔膜条袋包括顺次叠放的第一隔膜、带状第二极性片、以及第二隔膜，且第一极性与第二极性不相同。
本发明提供的锂离子电池芯结合了卷绕式和叠片式的优点，相对于现有技术，其在制作过程中只需对第一极性片进行冲切，而无需对带状第二极性片进行冲切，从而大幅减少了冲切过程中极性敷料的脱落，降低了由此导致的产品不良率；另外，其制作过程中只需对多个单片状第一极性片进行对齐控制，从而降低了极片的对齐精度控制难度，提高了产品的生产效率。
当第一极性是正极，第二极性是负极时，图1示出了本发明第一实施例提供的锂离子电池芯的卷绕截面，为了便于说明，仅示出了与本发明第一实施例相关的部分。
本发明第一实施例提供的锂离子电池芯包括多个单片状正极11以及一卷绕式负极隔膜条袋，多个单片状正极11分别相互对齐排布于该卷绕式负极隔膜条袋的相邻卷绕层间隔中；该卷绕式负极隔膜条袋包括顺次叠放的第一隔膜13、带状负极片12、以及第二隔膜14。
图2是图1中带状负极片12的正视图，图3是图1中单片状正极11的正视图。
如图2所示，带状负极片12包括一带状集流体，该带状集流体表面沿着与带状集流体卷绕方向垂直的方向，均匀分布有涂布区121和未涂布区122，涂布区121涂布有负极敷料，未涂布区122从带状集流体卷绕起始端到卷绕终止端均为负极极耳。
如图3所示，正极极耳123从单片状正极11引出，每个单片状正极11引出一个正极极耳123，正极极耳123引出方向与负极极耳引出方向分布在与带状集流体卷绕方向垂直的方向上，且正极极耳123和负极极耳分布在带状集流体卷绕方向的两侧。
本发明实施例还提供了一种锂离子电池，包括一如上本发明第一实施例所述的锂离子电池芯。
当第一极性是负极，第二极性是正极时，图4示出了本发明第二实施例提供的锂离子电池芯的卷绕截面，为了便于说明，仅示出了与本发明第二实施例相关的部分。
本发明第二实施例提供的锂离子电池芯包括多个单片状负极21以及一卷绕式正极隔膜条袋，多个单片状负极21分别相互对齐排布于该卷绕式正极隔膜条袋的相邻卷绕层间隔中；该卷绕式正极隔膜条袋包括顺次叠放的第一隔膜13、带状正极片22、以及第二隔膜14。
图5是图4中带状正极片22的正视图。
具体地，带状正极片22包括一带状集流体，以及沿该带状集流体卷绕方向间隔涂布于该带状集流体部分表面的正极敷料221，该带状集流体的每一未涂布有正极敷料221的间隔区域222分别引出有一正极极耳，锂离子电池芯在正极极耳引出端，同时引出有负极极耳。此外，正极敷料221的涂布区域与单片状负极21放置区域相对应。
本发明实施例还提供了一种锂离子电池，包括一如上本发明第二实施例所述的锂离子电池芯。
图6示出了本发明提供的锂离子电池芯的制作方法流程。
在步骤S101中，将第一极性片冲切成多个单片状第一极性片。
在步骤S102中，将第一隔膜、带状第二极性片、第二隔膜顺次层叠后卷绕。
在步骤S103中，将多个单片状第一极性片相互对齐排布于卷绕后的相邻卷绕层间隔中。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体（Read-Only Memory，ROM）或随机存储记忆体（Random Access Memory，RAM）等。
在本发明的一个实施例中，单片状第一极性片是单片状正极，卷绕式第二极性隔膜条袋是卷绕式负极性隔膜条袋，带状第二极性片是带状负极片。其中，带状负极片的结构如上图2所示，单片状正极的结构如上图3所示，在此不再赘述。
在本发明的另一个实施例中，单片状第一极性片是单片状负极，卷绕式第二极性隔膜条袋是卷绕式正极性隔膜条袋，带状第二极性片是带状正极片。其中，带状正极片的结构如上图5所示，在此不再赘述。
本发明提供的锂离子电池芯结合了卷绕式和叠片式的优点，相对于现有技术，其在制作过程中只需对第一极性片进行冲切，而无需对带状第二极性片进行冲切，从而大幅减少了冲切过程中极性敷料的脱落，降低了由此导致的产品不良率；另外，其制作过程中只需对多个单片状第一极性片进行对齐控制，从而降低了极片的对齐精度控制难度，提高了产品的生产效率。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

  1. 一种锂离子电池芯，其特征在于，所述锂离子电池芯包括多个单片状第一极性片以及一卷绕式第二极性隔膜条袋，所述多个单片状第一极性片分别相互对齐排布于所述卷绕式第二极性隔膜条袋的相邻卷绕层间隔中；
    所述卷绕式第二极性隔膜条袋包括顺次叠放的第一隔膜、带状第二极性片、以及第二隔膜，且所述第一极性与所述第二极性不相同。
  2. 如权利要求1所述的锂离子电池芯，其特征在于，所述单片状第一极性片是单片状正极，所述卷绕式第二极性隔膜条袋是卷绕式负极性隔膜条袋，所述带状第二极性片是带状负极片。
  3. 如权利要求2所述的锂离子电池芯，其特征在于，所述带状负极片包括一带状集流体，所述带状集流体表面沿着与所述带状集流体卷绕方向垂直的方向，均匀分布有涂布区和未涂布区，所述涂布区涂布有负极敷料；
    所述未涂布区从所述带状集流体卷绕起始端到卷绕终止端均为负极极耳；正极极耳从所述单片状正极引出，每个所述单片状正极引出一个正极极耳，所述正极极耳引出方向与所述负极极耳引出方向分布在与所述带状集流体卷绕方向垂直的方向上，且所述正极极耳和所述负极极耳分布在所述带状集流体卷绕方向的两侧。
  4. 如权利要求1所述的锂离子电池芯，其特征在于，所述单片状第一极性片是单片状负极，所述卷绕式第二极性隔膜条袋是卷绕式正极性隔膜条袋，所述带状第二极性片是带状正极片。
  5. 如权利要求4所述的锂离子电池芯，其特征在于，所述带状正极片包括一带状集流体，以及沿所述带状集流体卷绕方向间隔涂布于所述带状集流体部分表面的正极敷料，且所述正极敷料的涂布区域与所述单片状负极放置区域相对应；
    所述带状集流体的每一未涂布有正极敷料的间隔区域分别引出有一正极极耳，所述锂离子电池芯在所述正极极耳引出端同时引出有负极极耳。
  6. 一种如权利要求1所述的锂离子电池芯的制作方法，其特征在于，所述方法包括以下步骤：
    将第一极性片冲切成多个单片状第一极性片；
    将第一隔膜、带状第二极性片、第二隔膜顺次层叠后卷绕；
    将所述多个单片状第一极性片相互对齐排布于卷绕后的相邻卷绕层间隔中。
  7. 如权利要求6所述的锂离子电池芯的制作方法，其特征在于，所述单片状第一极性片是单片状正极，所述卷绕式第二极性隔膜条袋是卷绕式负极性隔膜条袋，所述带状第二极性片是带状负极片；或者
    所述单片状第一极性片是单片状负极，所述卷绕式第二极性隔膜条袋是卷绕式正极性隔膜条袋，所述带状第二极性片是带状正极片。
  8. 如权利要求7所述的锂离子电池芯的制作方法，其特征在于，所述带状负极片包括一带状集流体，所述带状集流体表面沿着与所述带状集流体卷绕方向垂直的方向，均匀分布有涂布区和未涂布区，所述涂布区涂布有负极敷料；
    所述未涂布区从所述带状集流体卷绕起始端到卷绕终止端均为负极极耳；正极极耳从所述单片状正极引出，每个所述单片状正极引出一个正极极耳，所述正极极耳引出方向与所述负极极耳引出方向分布在与所述带状集流体卷绕方向垂直的方向上，且所述正极极耳和所述负极极耳分布在所述带状集流体卷绕方向的两侧。
  9. 如权利要求7所述的锂离子电池芯的制作方法，其特征在于，所述带状正极片包括一带状集流体，以及沿所述带状集流体卷绕方向间隔涂布于所述带状集流体部分表面的正极敷料，且所述正极敷料的涂布区域与所述单片状负极放置区域相对应；
    所述带状集流体的每一未涂布有正极敷料的间隔区域分别引出有一正极极耳，所述锂离子电池芯在所述正极极耳引出端同时引出有负极极耳。
  10. 一种锂离子电池，其特征在于，所述锂离子电池包括一如权利要求1至5任一项所述的锂离子电池芯。
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