WO2024255911A1 - 叠片芯包及其叠片方法、电池 - Google Patents

叠片芯包及其叠片方法、电池 Download PDF

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Publication number
WO2024255911A1
WO2024255911A1 PCT/CN2024/099674 CN2024099674W WO2024255911A1 WO 2024255911 A1 WO2024255911 A1 WO 2024255911A1 CN 2024099674 W CN2024099674 W CN 2024099674W WO 2024255911 A1 WO2024255911 A1 WO 2024255911A1
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WIPO (PCT)
Prior art keywords
electrode sheet
separator
negative electrode
core package
positive electrode
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Ceased
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PCT/CN2024/099674
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English (en)
French (fr)
Inventor
舒宽金
贺孝武
段栋
刘子文
苑丁丁
何巍
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Eve Power Co Ltd
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Eve Power Co Ltd
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Publication date
Application filed by Eve Power Co Ltd filed Critical Eve Power Co Ltd
Priority to EP24822856.1A priority Critical patent/EP4730472A1/en
Publication of WO2024255911A1 publication Critical patent/WO2024255911A1/zh
Priority to US19/420,793 priority patent/US20260106326A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/471—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof
    • H01M50/474—Spacing elements inside cells other than separators, membranes or diaphragms; Manufacturing processes thereof characterised by their position inside the cells
    • 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 technical field of lithium batteries, and in particular to a laminated core package and a battery.
  • the lamination process still has great defects.
  • the pole piece is made into a composite sheet with the diaphragm in advance and then the core package is made by winding. This process has very high requirements on the positioning of the composite sheet, which is prone to overhang dimensional problems, increasing the difficulty of manufacturing.
  • An embodiment of the present application provides a laminated core package, in which, in the thickness direction of the laminated core package, the core package includes a positive electrode sheet, a negative electrode sheet, and a separator located between the positive electrode sheet and the negative electrode sheet, and at least one end of the positive electrode sheet, the negative electrode sheet, and the separator, the edge of the separator is flush with the edge of the negative electrode sheet, and the edge of the separator exceeds the edge of the positive electrode sheet.
  • An embodiment of the present application provides a lamination method for a laminated core package, comprising the following steps:
  • the two layers of separators are respectively arranged on opposite sides of the negative electrode sheet, and the edges of the separators are flush with the edges of the negative electrode sheet;
  • the positive electrode sheet is arranged on one side of one of the two layers of separators, the edge of the separator exceeds the edge of the positive electrode sheet, and the positive electrode sheet, the two layers of separators and the negative electrode sheet form a laminated unit;
  • a plurality of lamination units are stacked using a stacking tool to complete the lamination of the lamination core package.
  • FIG1 is a schematic diagram of a front view of a laminated core package provided in an embodiment of the present application.
  • FIG3 is a schematic structural diagram of a lamination unit provided in an embodiment of the present application.
  • FIG4 is a flow chart of steps S1 to S3 in a lamination method of a lamination core package provided in an embodiment of the present application;
  • FIG5 is another schematic flow chart of steps S1 to S3 in the lamination method of the lamination core package provided in an embodiment of the present application;
  • FIG. 6 is a flow chart of steps S5 to S6 in the lamination method of the lamination core package provided in an embodiment of the present application.
  • the laminate core package 1 includes a plurality of laminate units 14 stacked together, each laminate unit 14 includes a positive electrode sheet 11 and a negative electrode diaphragm composite sheet 15, the negative electrode diaphragm composite sheet 15 includes a negative electrode sheet 12 and two layers of diaphragms 13 located on opposite sides of the negative electrode sheet 12; wherein one of the two layers of diaphragms 13 is located between the positive electrode sheet 11 and the negative electrode sheet 12, and the other layer of the two layers of diaphragms 13 is located between the negative electrode sheet 12 and the positive electrode sheet 11 in the adjacent laminate unit 14.
  • the laminated core package in the embodiment of the present application is to bond the opposite side surfaces of the negative electrode sheet 12 to the two layers of separator 13 to form a negative electrode separator composite sheet 15, and then composite the positive electrode sheet 11 with the negative electrode separator composite sheet 15 to form a laminated unit 14, and the laminated core package 1 is laminated with the laminated unit 14 as a basic unit.
  • the negative electrode sheet 12 and the two layers of separator 13 are continuously composited to form the negative electrode separator composite sheet 15, and the positive electrode sheet 11 and the negative electrode separator composite sheet 15 are monolithically composited, and the basic structure of the formed laminated unit 14 is separator 13-negative electrode sheet 12-separator 13-positive electrode sheet 11.
  • the positive electrode sheet 11 is directly positioned on one of the layers of the diaphragm 13 of the negative electrode diaphragm composite sheet 15 after cutting and slicing, and there is no need to paste the positive electrode sheet 11 and the diaphragm 13, the transfer of the positive and negative electrode sheets 12 and the diaphragm 13 is reduced, which is beneficial to reducing the risk of folding of the electrode sheet and the diaphragm 13, greatly improving the efficiency of battery production, and also reducing the cost of battery production.
  • the edge of the separator 13 extends beyond the edge of the positive electrode sheet 11 by a dimension greater than 0.1 mm and less than 5 mm.
  • the edge of the separator 13 extends beyond the edge of the positive electrode sheet 11 by more than 1 mm and less than 3 mm.
  • the laminated core package 1 further includes an insulating layer 2, which covers at least two sides of the laminated core package 1 to improve the electronic insulation and ion insulation between the laminated core package 1 and the shell, and improve the corrosion resistance of the shell.
  • the laminated core package 1 is square.
  • the laminated core package 1 includes a first side surface 16 and a second side surface 17 which are perpendicular to each other.
  • the first side surface 16 is formed by the end surfaces of the positive electrode sheet 11, the separator 13 and the negative electrode sheet 12.
  • the first side surface 16 is parallel to the stacking direction of the laminated unit 14, and the second side surface 17 is parallel to the plane direction of the positive electrode sheet 11, the separator 13 and the negative electrode sheet 12.
  • the second side surface 17 is perpendicular to the first side surface 16.
  • the insulating layer 2 includes an integrated first insulating portion 21 and a second insulating portion 22 .
  • the first insulating portion 21 covers the first side surface 16 .
  • the second insulating portion 22 is formed by bending the first insulating portion 21 inwardly.
  • the second insulating portion 22 covers at least a portion of the second side surface 17 .
  • the area size H3 of the insulating layer 2 covering the laminated core package 1 is greater than 3 mm, and the area size of the insulating layer 2 covering the laminated core package 1 is smaller than the thickness of the laminated core package 1. That is, the area size of the second insulating portion 22 covering the second side surface 17 is greater than 3 mm, and the area size of the second insulating portion 22 covering the second side surface 17 is smaller than the length of the second side surface 17.
  • the insulating layer 2 includes an insulating tape.
  • the present application also provides a lamination method for a lamination core package, comprising the following steps:
  • the edge of the diaphragm 13 is flush with the edge of the negative electrode sheet 12 by pre-compounding and cutting the negative electrode sheet 12, and there is no need to control the overhang dimension H1 between the diaphragm 13 and the negative electrode sheet 12; during the compounding process of the positive electrode sheet 11 and the negative electrode sheet 12, the overhang dimension H2 between the diaphragm 13 and the positive electrode sheet 11 is controlled, so that the edge of the diaphragm 13 exceeds the edge of the positive electrode sheet 11, and the stacking tool 3 is used to clamp the stacked electrode sheets during the stacking process. There is no need to control the overhang dimension H2 between the diaphragm 13 and the positive electrode sheet 11, which can achieve high-precision control and high-efficiency stacking, which is beneficial to improving the low positioning accuracy of the electrode sheets and avoiding poor overhang dimensions.
  • step S2 the positive electrode sheet coil is cut by a cutting unit to form positive electrode sheets 11 having a required size.
  • the stacking tool 3 may be a robot, which clamps the stacking units 14 in batches for stacking.
  • the clamping width of the robot is the same as the width of the negative electrode sheet 12.
  • the negative electrode diaphragm composite sheet 15 is first cut, and then it is combined with the positive electrode sheet 11 to form a laminated unit 14, and then multiple laminated units 14 are stacked and finally wrapped with tape.
  • step S1 the negative electrode sheet coil and the two layers of separator 13 are passed through a hot pressing roller, so that the negative electrode sheet 12 and the separator 13 are bonded and fixed.
  • the hot pressing roller is a roller that applies temperature when rolling.
  • a heating unit is also provided to heat the negative electrode sheet coil and the separator 13.
  • flat roller rolling, patterned roller rolling or smooth roller rolling can also be used, and this application does not limit this.
  • the positive electrode sheet 11 is first composited with the negative electrode diaphragm composite sheet 15, and then the composite structure is cut to form a laminated unit 14, and then multiple laminated units 14 are stacked and finally wrapped with tape.
  • step S1 two layers of separators 13 are respectively disposed on opposite sides of the negative electrode sheet roll to form a negative electrode separator composite sheet 15 ; in step S3 , the negative electrode separator composite sheet 15 and the positive electrode sheet 11 are stacked and cut to form a stacking unit 14 .
  • the embodiment of the present application further provides a battery, which includes an electrolyte, a shell, and a laminated core package 1, wherein the shell is used to encapsulate the laminated core package 1 and the electrolyte.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)

Abstract

本申请提供一种叠片芯包及其叠片方法、电池，在叠片芯包厚度方向上，叠片芯包包括正极片、负极片以及位于正极片和负极片之间的隔膜，在正极片、负极片和隔膜的至少一端，隔膜的边缘与负极片的边缘齐平，隔膜的边缘超出正极片的边缘。

Description

叠片芯包及其叠片方法、电池
本申请要求在2023年6月16日提交中国专利局、申请号为202321554850.7的中国专利申请的优先权，以上申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及锂电池技术领域，具体涉及叠片芯包和电池。
 背景技术
现有方形电池的芯包制作工艺采用两种工艺：卷绕工艺和叠片工艺。相较于卷绕工艺，采用叠片工艺制备的芯包在结构稳定性、空间利用率等方面均更占优势。
 发明概述
但叠片工艺仍存在很大的缺陷，例如，相关技术中将极片提前与隔膜制作复合片再通过卷绕方式制作芯包，该工艺对复合片位置的定位要求非常高，容易出现overhang尺寸不良问题，加大了制造的难度。
本申请的实施例提供了一种叠片芯包，在叠片芯包的厚度方向上，芯包包括正极片、负极片以及位于正极片和负极片之间的隔膜，在正极片、负极片和隔膜的至少一端，隔膜的边缘与负极片的边缘齐平，且隔膜的边缘超出正极片的边缘。
本申请的实施例提供了一种电池，包括电解液、壳体以及上述叠片芯包，壳体用于将叠片芯包和电解液封装。
本申请的实施例提供了一种叠片芯包的叠片方法，包括以下步骤：
将两层隔膜分别设置于负极片的相对两侧，隔膜的边缘与负极片的边缘齐平；
将正极片卷料进行断切，形成正极片；
将正极片设置于两层隔膜中的其中一层的一侧，隔膜的边缘超出正极片的边缘，正极片、两层隔膜和负极片形成一个叠片单元；
重复制造多个叠片单元；
使用堆叠工装将多个叠片单元进行堆叠，以完成叠片芯包的叠片。
有益效果
在本申请的实施例中，叠片芯包包括芯包，在叠片芯包厚度方向上，叠片芯包包括正极片、负极片以及位于正极片和负极片之间的隔膜；通过负极片与隔膜预先复合、断切，使得隔膜的边缘与负极片的边缘齐平，无需控制隔膜与负极片之间的overhang尺寸；在正极片与负极片复合过程控制隔膜与正极片之间的overhang尺寸，使得隔膜的边缘超出正极片的边缘，在堆叠过程中使用堆叠工装夹持堆叠的极片，无需再控制隔膜与正极片之间的overhang尺寸，能够实现高精度控制和高效率堆叠，有利于提高极片定位精度低，避免出现overhang尺寸不良。
 附图说明
图1是本申请的实施例提供的叠片芯包的一种主视结构示意图；
图2是本申请的实施例提供的叠片芯包的一种左视结构示意图；
图3是本申请的实施例提供的叠片单元的一种结构示意图；
图4是本申请的实施例提供的叠片芯包的叠片方法中的步骤S1至S3的一种流程示意图；
图5是本申请的实施例提供的叠片芯包的叠片方法中的步骤S1至S3的另一种流程示意图；
图6是本申请的实施例提供的叠片芯包的叠片方法中的步骤S5至S6的一种流程示意图。
 本发明的实施方式
请参阅图1和图2，本申请实施例提供一种叠片芯包，包括在叠片芯包厚度方向上，叠片芯包1包括正极片11、负极片12以及位于正极片11和负极片12之间的隔膜13，在正极片11、负极片12和隔膜13的至少一端，隔膜13的边缘与负极片12的边缘齐平，隔膜13的边缘超出正极片11的边缘。
可以理解的是，本申请实施例提供的叠片芯包1通过负极片12与隔膜13预先复合、断切，使得隔膜13的边缘与负极片12的边缘齐平，无需控制隔膜13与负极片12之间的overhang尺寸H1；在正极片11与负极片12复合过程中控制隔膜13与正极片11之间的overhang尺寸H2，使得隔膜13的边缘超出正极片11的边缘，在堆叠过程中使用堆叠工装3夹持堆叠的极片，无需再控制隔膜13与正极片11之间的overhang尺寸H2，能够实现高精度控制和高效率堆叠，有利于提高极片定位精度低，避免出现Overhang尺寸不良。
在一种实施例中，请参阅图3，叠片芯包1包括堆叠设置的多个叠片单元14，每一叠片单元14包括一个正极片11和一个负极隔膜复合片15，负极隔膜复合片15包括一个负极片12以及位于负极片12相对两侧的两层隔膜13；其中，两层隔膜13中的其中一层位于正极片11和负极片12之间，两层隔膜13中的另外一层位于负极片12与相邻的叠片单元14中的正极片11之间。
本申请实施例中的叠片芯包，是将负极片12的相对两侧表面分别粘接于两层隔膜13上以形成负极隔膜复合片15，再将正极片11与负极隔膜复合片15进行复合以形成一个叠片单元14，叠片芯包1以叠片单元14为基本单元进行叠片。简单地说，负极片12与两层隔膜13连续复合形成负极隔膜复合片15，正极片11与负极隔膜复合片15单片间断复合，形成的叠片单元14的基本结构为隔膜13-负极片12-隔膜13-正极片11。
可以理解的是，在本申请实施例中，由于正极片11在切割分片后直接定位在负极隔膜复合片15的其中一层隔膜13上，而无需将正极片11与隔膜13进行粘贴，减少了正负极片12及隔膜13的转移，有利于降低极片翻折、隔膜13翻折的风险，大幅度提高了电池生产的效率，同时也降低了电池生产的成本。
在一种实施例中，隔膜13的边缘超出正极片11的边缘的尺寸大于0.1毫米且小于5毫米。
隔膜13的边缘超出正极片11的边缘的尺寸大于1毫米且小于3毫米。
在一种实施例中，请参阅图2，叠片芯包1还包括绝缘层2，绝缘层2覆盖叠片芯包1的至少两个侧面，以提升叠片芯包1与壳体之间的电子绝缘性能和离子绝缘性能，提升壳体的耐腐蚀性。
在本申请实施例中，叠片芯包1为方形。叠片芯包1括相互垂直的第一侧面16和第二侧面17，第一侧面16由正极片11、隔膜13和负极片12的端面形成，第一侧面16平行于叠片单元14的堆叠方向，第二侧面17平行于正极片11、隔膜13和负极片12的平面方向，第二侧面17与第一侧面16垂直。
对应的，绝缘层2包括一体的第一绝缘部21和第二绝缘部22，第一绝缘部21覆盖第一侧面16，第二绝缘部22由第一绝缘部21向内弯折而成，第二绝缘部22覆盖至少部分第二侧面17。
在叠片芯包1厚度方向上，绝缘层2覆盖叠片芯包1的区域尺寸H3大于3毫米，且绝缘层2覆盖叠片芯包1的区域尺寸小于叠片芯包1的厚度。即，第二绝缘部22覆盖第二侧面17的区域尺寸大于3毫米，且第二绝缘部22覆盖第二侧面17的区域尺寸小于第二侧面17的长度。
可选的，绝缘层2包括绝缘胶带。
请参阅图4-图6，本申请实施例还提供一种叠片芯包的叠片方法，包括以下步骤：
S1，将两层隔膜13分别设置于负极片12的相对两侧，隔膜13的边缘与负极片12的边缘齐平；
S2，将正极片卷料进行断切，形成正极片11；
S3，将正极片11设置于两层隔膜13中的其中一层的一侧，隔膜13的边缘超出正极片11的边缘，正极片11、两层隔膜13和负极片12形成一个叠片单元14；
S4，重复步骤S1-S3，形成多个叠片单元14；
S5，使用堆叠工装3将多个叠片单元14进行堆叠，以完成叠片芯包1的叠片；以及
S6，将绝缘层2覆盖在叠片芯包1的至少两个侧面。
可以理解的是，本申请实施例通过负极片12与隔膜13预先复合、断切，使得隔膜13的边缘与负极片12的边缘齐平，无需控制隔膜13与负极片12之间的overhang尺寸H1；在正极片11与负极片12复合过程控制隔膜13与正极片11之间的overhang尺寸H2，使得隔膜13的边缘超出正极片11的边缘，在堆叠过程中使用堆叠工装3夹持堆叠的极片，无需再控制隔膜13与正极片11之间的overhang尺寸H2，能够实现高精度控制和高效率堆叠，有利于提高极片定位精度低，避免出现overhang尺寸不良。
在步骤S2中，通过断切单元对正极片卷料进行断切操作，以形成具有满足要求尺寸的正极片11。
在步骤S5中，如图6所示，堆叠工装3可以为机械手，机械手分次夹持叠片单元14进行堆叠。在本申请实施例中，机械手的夹持宽度与负极片12的宽度相同。
在一种实施例中，如图4所示，形成负极隔膜复合片15之后，先对负极隔膜复合片15进行断切，之后，再将其与正极片11进行复合形成一个叠片单元14，然后再进行多个叠片单元14的堆叠，最后进行包胶带。
在步骤S1中，将两层隔膜13分别设置于负极片卷料的相对两侧以形成负极隔膜复合片15，对负极隔膜复合片15断切；在步骤S3中，将断切后的负极隔膜复合片15与正极片11堆叠，形成叠片单元14。
在步骤S1中，负极片卷料与两层隔膜13一起过热压辊，使得负极片12与隔膜13粘接固定。热压辊为压辊在进行辊压时，施加有温度，本实施例还设置有一加热单元对负极片卷料和隔膜13进行加热。当然的，还可采用平辊辊压、花纹辊压或光辊辊压，本申请对此不做限制。
在一种实施例中，如图5所示，形成负极隔膜复合片15之后，先将正极片11与负极隔膜复合片15进行复合，再对复合后的结构进行断切形成一个叠片单元14，然后再进行多个叠片单元14的堆叠，最后进行包胶带。
在步骤S1中，将两层隔膜13分别设置于负极片卷料的相对两侧以形成负极隔膜复合片15；在步骤S3中，将负极隔膜复合片15与正极片11堆叠，断切，形成叠片单元14。
本申请实施例还提供一种电池，电池包括电解液、壳体以及叠片芯包1，壳体用于将叠片芯包1和电解液封装。
在本申请实施例中，电池为方壳电池。
有益效果为：在本申请的实施例中，叠片芯包包括芯包，在叠片芯包厚度方向上，叠片芯包包括正极片、负极片以及位于正极片和负极片之间的隔膜；通过负极片与隔膜预先复合、断切，使得隔膜的边缘与负极片的边缘齐平，无需控制隔膜与负极片之间的overhang尺寸；在正极片与负极片复合过程控制隔膜与正极片之间的overhang尺寸，使得隔膜的边缘超出正极片的边缘，在堆叠过程中使用堆叠工装夹持堆叠的极片，无需再控制隔膜与正极片之间的overhang尺寸，能够实现高精度控制和高效率堆叠，有利于提高极片定位精度低，避免出现overhang尺寸不良。

Claims (13)

  1. 一种叠片芯包（1），在所述叠片芯包（1）的厚度方向上，包括正极片（11）、负极片（12）以及位于所述正极片（11）和所述负极片（12）之间的隔膜（13），在所述正极片（11）、所述负极片（12）和所述隔膜（13）的至少一端，所述隔膜（13）的边缘与所述负极片（12）的边缘齐平，且所述隔膜（13）的边缘超出所述正极片（11）的边缘。
  2. 根据权利要求1所述的叠片芯包（1），所述叠片芯包（1）包括堆叠设置的多个叠片单元（14），每一所述叠片单元（14）包括一个所述正极片（11）和一个负极隔膜复合片（15），所述负极隔膜复合片（15）包括一个所述负极片（12）以及位于所述负极片（12）相对两侧的两层隔膜（13）；
    其中，所述两层隔膜（13）中的其中一层位于所述正极片（11）和所述负极片（12）之间，所述两层隔膜（13）中的另外一层位于所述负极片（12）与相邻的所述叠片单元（14）中的所述正极片（11）之间。
  3. 根据权利要求2所述的叠片芯包（1），其中，所述隔膜（13）的边缘超出所述正极片（11）的边缘的尺寸大于0.1毫米且小于5毫米。
  4. 根据权利要求3所述的叠片芯包（1），其中，所述隔膜（13）的边缘超出所述正极片（11）的边缘的尺寸大于1毫米且小于3毫米。
  5. 根据权利要求1-4任意一项所述的叠片芯包（1），所述叠片芯包（1）还包括绝缘层（2），所述绝缘层（2）覆盖所述叠片芯包（1）的至少两个侧面。
  6. 根据权利要求5所述的叠片芯包（1），其中，在所述叠片芯包（1）厚度方向上，所述绝缘层（2）覆盖所述叠片芯包（1）的区域尺寸大于3毫米。
  7. 根据权利要求5所述的叠片芯包（1），其中，在所述叠片芯包（1）厚度方向上，所述绝缘层（2）覆盖所述叠片芯包（1）的区域尺寸小于所述叠片芯包（1）的厚度。
  8. 根据权利要求5所述的叠片芯包（1），其中，所述绝缘层（2）包括绝缘胶带。
  9. 一种电池，包括电解液、壳体以及权利要求1-8中任意一项所述的叠片芯包（1），所述壳体用于将所述叠片芯包（1）和所述电解液封装。
  10. 根据权利要求9所述的电池，其中，所述电池为方壳电池。
  11. 一种叠片芯包的叠片方法，包括以下步骤：
    将两层隔膜（13）分别设置于负极片（12）的相对两侧，所述隔膜（13）的边缘与所述负极片（12）的边缘齐平；
    将正极片卷料进行断切，形成正极片（11）；
    将所述正极片（11）设置于两层所述隔膜（13）中的其中一层的一侧，所述隔膜（13）的边缘超出所述正极片（11）的边缘，所述正极片（11）、两层所述隔膜（13）和所述负极片（12）形成一个叠片单元（14）；
    重复制造多个所述叠片单元（14）；
    使用堆叠工装（3）将多个所述叠片单元（14）进行堆叠，以完成叠片芯包（1）的叠片。
  12. 根据权利要求11所述的叠片方法，其中，所述将两层隔膜（13）分别设置于负极片（12）的相对两侧，包括：将所述两层隔膜（13）分别设置于负极片卷料的相对两侧以形成负极隔膜复合片（15），对所述负极隔膜复合片（15）切断；
    所述将所述正极片（11）设置于两层所述隔膜（13）中的其中一层的一侧，包括：将断切后的所述负极隔膜复合片（15）与所述正极片（11）堆叠。
  13. 根据权利要求11或12所述的叠片方法，其特征在于，在所述使用堆叠工装（3）将多个所述叠片单元（14）进行堆叠之后，所述叠片方法还包括：
    将绝缘层（2）覆盖在所述叠片芯包（1）的至少两个侧面。
PCT/CN2024/099674 2023-06-16 2024-06-17 叠片芯包及其叠片方法、电池 Ceased WO2024255911A1 (zh)

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