WO2021227729A1 - 极片、卷绕式电池电芯和电池 - Google Patents

极片、卷绕式电池电芯和电池 Download PDF

Info

Publication number
WO2021227729A1
WO2021227729A1 PCT/CN2021/086147 CN2021086147W WO2021227729A1 WO 2021227729 A1 WO2021227729 A1 WO 2021227729A1 CN 2021086147 W CN2021086147 W CN 2021086147W WO 2021227729 A1 WO2021227729 A1 WO 2021227729A1
Authority
WO
WIPO (PCT)
Prior art keywords
groove
side wall
pole piece
current collector
contour line
Prior art date
Application number
PCT/CN2021/086147
Other languages
English (en)
French (fr)
Inventor
姜新军
张剑
雷磊
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to EP21804427.9A priority Critical patent/EP4148836A1/en
Priority to JP2022567758A priority patent/JP7459300B2/ja
Priority to KR1020227042986A priority patent/KR20230009442A/ko
Publication of WO2021227729A1 publication Critical patent/WO2021227729A1/zh
Priority to US17/977,043 priority patent/US20230052214A1/en

Links

Images

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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/72—Grids
    • 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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • 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
    • H01M6/00—Primary cells; Manufacture thereof
    • 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
    • H01M2004/021—Physical characteristics, e.g. porosity, surface area
    • 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 disclosure relates to the field of batteries, in particular to a pole piece, a wound battery cell and a battery.
  • the battery pole piece includes a current collector and an active material coated on the surface of the current collector.
  • the current collector is generally aluminum foil or copper foil.
  • the pole pieces In the current production process of battery pole pieces, in order to obtain pole pieces that meet the design parameters, the pole pieces must be rolled. However, during the rolling process, the active material needs to be compacted. At the same time, the active material will squeeze the foil, which will eventually cause the foil to have a certain degree of ductility. Since there is no expansion in the position where the active material layer is not coated, the edges of the foil will be waved in appearance due to the difference in ductility at the position where there is active material and where there is no active material. Wrinkles will affect the welding strength of the tabs, leading to poor welding or increasing the resistance of the battery. The battery heats up quickly during charging and discharging, and the cycle life decays faster. At the junction of the groove and the active material, the active material is also easier to fall off, and the exposed foil is a serious quality problem for the pole piece.
  • the present disclosure provides a pole piece, a wound battery cell and a battery, which can solve the problems of battery pole piece exposed foil, short cycle life of the cell and rapid battery heating caused by the wrinkling of the current collector during the pole piece rolling process .
  • the present disclosure provides a pole piece, including a current collector and a first active material layer coated on the surface of the current collector, the first active material layer is provided with a first groove, and the first
  • the active material layer includes a first side wall, a second side wall, and a third side wall.
  • the first side wall and the second side wall are arranged oppositely and parallel to each other.
  • the third side wall is connected to the first side.
  • the vertical distance of the side wall is the width of the first groove
  • the shape of the orthographic projection of the third side wall on the surface of the current collector is the contour line of the third side wall
  • the length of the contour line is greater than The width of the first groove.
  • the contour line is a curve or a straight line.
  • the contour line being a curve includes: the curve being an independent arc line or a combination of a straight line and an arc line.
  • the contour line is a circular arc line, and the radius of the circular arc line is half of the width of the first groove. At this time, the degree of wrinkling of the current collector is the lightest.
  • the current collector includes opposite first and second sides, and the first groove extends from the first side to the second side; when the contour line is a curve, The contour line is recessed toward the direction of the second side edge.
  • the pole piece further includes a second active material layer, the second active material layer is disposed on the surface of the current collector facing away from the first active material layer, and the second active material layer is disposed with The first groove is the same as the second groove.
  • the second groove and the first groove are arranged directly opposite or staggered.
  • the second groove extends from the second side to the first side.
  • the present disclosure also provides a wound battery cell, including an isolation film and the pole piece according to any one of the various embodiments of the first aspect, and the pole piece is arranged between the two pole pieces. Mentioned isolation membrane.
  • the present disclosure provides a battery including the wound battery cell as described in the second aspect.
  • the perimeter of the first groove becomes longer, so that the area of the current collector at the first groove increases, and the first groove is rolled during rolling.
  • the force-receiving area of the current collector at the groove becomes larger, the pressure of the active material layer on the current collector per unit area is reduced, and the elongation of the current collector is reduced, thereby reducing the phenomenon of wrinkling of the current collector.
  • Fig. 1 is a schematic diagram of a battery structure according to an embodiment
  • FIG. 2 is a schematic diagram of the structure of a wound battery cell according to an embodiment
  • Fig. 3 is a schematic diagram of a front view of a pole piece according to an embodiment
  • FIG. 4 is a schematic diagram of a bottom structure of a pole piece according to an embodiment
  • Fig. 5 is a schematic diagram of a front view of a pole piece according to an embodiment
  • Fig. 6 is a schematic diagram of a front view of a pole piece according to an embodiment
  • FIG. 7 is a schematic diagram of a front view structure of a pole piece according to an embodiment
  • Fig. 8 is a schematic diagram of a front view of a pole piece according to an embodiment
  • Fig. 9 is a schematic diagram of a bottom view of a pole piece according to an embodiment
  • Fig. 10 is a schematic diagram of a battery structure according to an embodiment.
  • Battery 100 battery case K, wound battery cell J, battery cover G, electrolyte injection port D, boss T1, cylindrical boss T2, pole piece 1/2, isolation membrane 3, current collector 10,
  • the first active material layer 11, the second active material layer 12, the first groove C1, the second groove C2, the first side wall B1, the second side wall B2, the third side wall B3, the first groove The contour line L1 of the three side walls, the contour line L2 of the third side wall of the second groove, the width 4 of the first groove C1, the first side 5 and the second side 6.
  • the battery 100 includes a battery housing K, a wound battery cell J placed in the battery housing K, and a battery upper cover G.
  • the wound battery cell J is provided by the embodiment of the present disclosure, and the specific structure will be described later.
  • the battery case K can be a cylinder with an open upper end.
  • the bottom of the inner wall of the cylinder is electrically connected to the current collector plate of the negative plate of the wound battery cell J.
  • a boss T1 is provided in the middle of the outer bottom to connect the negative electrode of the battery to the external device.
  • the battery upper cover G is a disc-shaped cover that matches the battery case K.
  • the lower part is provided with a downwardly protruding plane, which is electrically connected to the positive current collecting plate.
  • An insulating sealing ring is installed between the positive current collecting plate and the battery case K.
  • a cylindrical boss T2 protruding upward is provided in the middle of the upper part of the battery upper cover G to connect the positive electrode of the battery to an external device.
  • the upper cover G of the battery is provided with an electrolyte injection port D, which realizes the conduction of electrons between the positive and negative electrodes by injecting the electrolyte, and seals with a sealing nail after the electrolyte is injected.
  • the battery 100 with this structure generates less heat during charging and discharging, and has a slow attenuation rate for recycling, which can make the battery 100 have a longer service life.
  • the wound battery cell J provided in the present disclosure, the wrinkle phenomenon of the pole pieces is reduced, or even no wrinkles, and the resistance of the battery 100 can be reduced, so that the heating of the battery 100 is slowed down, and the active material layer of the pole pieces can also be reduced. Falling off causes the current collector to be exposed and prolongs the service life of the battery 100.
  • an embodiment of the present disclosure provides a wound battery cell J.
  • the wound battery cell J includes an isolation film 3 and the pole piece 1 and pole piece 2 provided by the embodiment of the present disclosure.
  • 1 and pole piece 2 can be a positive electrode and a negative electrode.
  • the separator 3 is usually a polymer material with nano-scale micropores. It is arranged between the pole piece 1 and the pole piece 2 to separate the two pole pieces. Avoid short circuit problems caused by the contact between the positive and negative electrodes, and at the same time allow electrolyte ions to pass through.
  • the pole piece 1, the isolation film 3 and the pole piece 2 are arranged in layers, and are wound by a special winding machine to form a wound battery cell J. By using the pole piece provided in the present disclosure, the wrinkle phenomenon of the pole piece is reduced, or even no wrinkles, the active material layer of the pole piece can be reduced, and the service life of the battery core can be prolonged.
  • the present disclosure provides a pole piece which includes a current collector 10 and a first active material layer 11 coated on the surface of the current collector 10.
  • the first active material layer 11 is provided with a first groove C1
  • the first groove C1 includes a first side wall B1, a second side wall B2, and a third side wall B3.
  • the first side wall B1 and the second side wall B2 are oppositely arranged and parallel to each other, the third side wall B3 connects the first side wall B1 and the second side wall B2, the first side wall B1, the second side wall B2 and the third side
  • the wall B3 encloses and forms a first groove C1.
  • the vertical distance from the first side wall B1 to the second side wall B2 is the width 4 of the first groove C1
  • the shape of the orthographic projection of the third side wall B3 on the surface of the current collector 10 is the contour line L1 of the third side wall B3,
  • the length of the contour line L1 is greater than the width 4 of the first groove C1.
  • the circumference of the first groove C1 becomes longer, so that the area of the current collector 10 at the first groove C1 is increased, During rolling, the force-receiving area of the current collector 10 at the first groove C1 becomes larger, the pressure of the first active material layer 11 on the current collector 10 per unit area is reduced, and the elongation of the current collector 10 is reduced, thereby reducing the current collector 10 Wrinkles appear.
  • the contour line L1 of the third side wall B3 is a curve or a straight line.
  • the force-bearing area of the current collector 10 can be increased, the pressure on the current collector 10 per unit area can be reduced, and the elongation of the current collector 10 can be further reduced.
  • the contour line L1 of the third side wall B3 is a straight line, and the straight line is not perpendicular to the first side wall B1 and the second side wall B2, but has an opposite angle and is inclined.
  • the contour line L1 of the third side wall B3 is a curve including: the contour line L1 of the third side wall B3 is an independent arc.
  • the contour line L1 is a circular arc line, and the radius of the circular arc line is half of the width 4 of the first groove C1.
  • the circumference of the first groove C1 is the longest, and the first groove C1 has the longest circumference.
  • the force-bearing area of the current collector 10 at C1 is the largest, and the degree of wrinkling of the current collector 10 is the lightest.
  • the radius of the arc line may also be larger or smaller than half of the width 4 of the first groove C1.
  • the contour line L1 of the third side wall B3 is a curve including: the contour line L1 of the third side wall B3 is an S-shaped curve, and the S-shaped curve is composed of two half-diameters. It is composed of a circular arc, and the diameter of the semi-circular arc is half of the width of the first groove C1.
  • the contour line L1 of the third side wall B3 is a curve.
  • the contour line L1 of the third side wall B3 is a combination of an arc and a straight line, and the arc can be a quarter.
  • Arbitrary arcs such as circular arcs and half circular arcs, and the straight line may be a straight line perpendicular or inclined to the first side wall B1.
  • the contour line L1 of the third side wall B3 is a curve and may also include a free curve of any shape.
  • the current collector 10 includes a first side 5 and a second side 6 opposite to each other.
  • the first groove C1 and the second groove C2 are directed from the first side 5 to the The second side 6 extends, the contour line L1 of the first groove C1 is curved, and the contour line L1 of the first groove C1 is recessed from the first side 5 to the second side 6, and the second groove C2 is
  • a groove C1 has the same structure.
  • the current collector 10 includes a first side 5 and a second side 6 opposed to each other, the pole piece also includes a second active material layer 12, and the second active material layer 12 is provided On the surface of the current collector 10 facing away from the first active material layer 11, the second active material layer 12 is provided with a second groove C2 that is the same as the first groove C1.
  • the contour line L1 of the first groove C1 extends from the first side 5 to the second side 6, and the contour line L1 of the third side wall B3 of the first groove C1 is determined by The first side edge 5 is recessed toward the second side edge 6.
  • the second groove C2 extends from the second side 6 to the first side 5, and the contour line L2 of the third side wall of the second groove C2 is recessed from the second side 6 to the first side 5.
  • the first groove C1 and the second groove C2 are arranged directly opposite to each other.
  • the first groove C1 and the second groove C2 are staggered.

Landscapes

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

Abstract

一种极片、卷绕式电池电芯(J)和电池(100)，极片包括集流体(10)和涂覆在集流体(10)表面的第一活性物质层(11)，第一活性物质层(11)设有第一凹槽(C1)，第一凹槽(C1)包括第一侧壁(B1)、第二侧壁(B2)和第三侧壁(B3)，第一侧壁(B1)、第二侧壁(B2)和第三侧壁(B3)围合形成第一凹槽(C1)，第一侧壁(B1)到第二侧壁(B2)的垂直距离为第一凹槽(C1)的宽度(4)，第三侧壁(B3)在集流体(10)的表面的正投影的形状为第三侧壁(B3)的轮廓线(L1)，轮廓线(L1)的长度大于第一凹槽(C1)的宽度(4)。通过使轮廓线(L1)的长度大于第一凹槽(C1)的宽度(4)，使得第一凹槽(C1)处的集流体(10)的面积增大，单位面积内活性物质层(11)对集流体(10)的压力减小，集流体(10)的延伸率减少，从而减少集流体(10)出现打皱的现象。

Description

极片、卷绕式电池电芯和电池
相关申请的交叉引用
本公开基于申请号为202020761606.8，申请日为2020年5月09日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本公开作为参考。
技术领域
本公开涉及电池领域，尤其涉及一种极片、卷绕式电池电芯和电池。
背景技术
电池极片包括集流体和涂覆在集流体表面的活性物质，集流体一般为铝箔或者铜箔。在当前的电池极片生产过程中，为了获得符合设计参数的极片，必须对极片进行辊压。然而在进行辊压工序的过程中，需要对活性物质进行压实，同时活性物质会对箔片产生挤压，最终导致箔片产生一定的延展性。由于没有涂覆活性物质层的位置没有发生延展，因此在有活性物质和没有活性物质的位置会因为延展性不一在外观上形成箔材边缘波浪，严重时甚至产生褶皱，极片凹槽处打皱会影响极耳焊接强度，导致焊接不良或者增大了电池的电阻，电池充放电过程中发热快，循环寿命衰减加快。凹槽与活性物质相接处，活物质也更容易脱落，露箔对极片来说是严重的品质问题。
发明内容
本公开提供一种极片、卷绕式电池电芯和电池，可解决极片辊压过程中由于集流体打皱引起的电池极片露箔、电芯循环使用寿命短和电池发热快的问题。
为实现本公开的目的，本公开提供了如下的技术方案：
第一方面，本公开提供了一种极片，包括集流体和涂覆在所述集流体表面的第一活性物质层，所述第一活性物质层设有第一凹槽，所述第一活性物质层包括第一侧壁、第二侧壁和第三侧壁，所述第一侧壁和所述第二侧壁相对设置且互相平行，所述第三侧壁连接所述第一侧壁和所述第二侧壁，所述第一侧壁、所述第二侧壁和所述第三侧壁围合形成所述第一凹槽，所述第一侧壁到所述第二侧壁的垂直距离为所述第一凹槽的宽度， 所述第三侧壁在所述集流体表面的正投影的形状为所述第三侧壁的轮廓线，所述轮廓线的长度大于所述第一凹槽的宽度。
其中，所述轮廓线为曲线或者直线。
其中，所述轮廓线为曲线包括：所述曲线为独立的弧线或者直线与弧线的组合。
其中，所述轮廓线为圆弧线，所述圆弧线的半径为所述第一凹槽的宽度的一半，此时集流体打皱程度最轻。
其中，所述集流体包括相对第一侧边和第二侧边，所述第一凹槽自所述第一侧边向所述第二侧边的方向延伸；所述轮廓线为曲线时，所述轮廓线朝向所述第二侧边的方向凹进。
其中，所述极片还包括第二活性物质层，所述第二活性物质层设置于所述集流体之背向所述第一活性物质层的表面，所述第二活性物质层设有与所述第一凹槽相同的第二凹槽。
其中，所述第二凹槽与所述第一凹槽正对或交错设置。
其中，所述第二凹槽自所述第二侧边向所述第一侧边的方向延伸。
第二方面，本公开还提供了一种卷绕式电池电芯，包括隔离膜和第一方面各种实施例中任一项所述的极片，两片所述极片之间设有所述隔离膜。
第三方面，本公开提供了一种电池，包括如第二方面所述的卷绕式电池电芯。
通过使第三侧壁的轮廓线的长度大于第一凹槽的宽度，使得第一凹槽的周长变长，使得第一凹槽处的集流体的面积增大，辊压时第一凹槽处的集流体受力面积变大，单位面积内活性物质层对集流体的压力减小，集流体的延伸率减少，从而减少集流体出现打皱的现象。
附图说明
为了更清楚地说明本公开实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是一种实施例的电池结构示意图；
图2是一种实施例的卷绕式电池电芯结构示意图；
图3是一种实施例的极片正视结构示意图；
图4是一种实施例的极片仰视结构示意图；
图5是一种实施例的极片正视结构示意图；
图6是一种实施例的极片正视结构示意图；
图7是一种实施例的极片正视结构示意图；
图8是一种实施例的极片正视结构示意图；
图9是一种实施例的极片仰视结构示意图；
图10是一种实施例的电池结构示意图。
附图标记：
电池100，电池外壳K，卷绕式电池电芯J，电池上盖G，电解液注入口D，凸台T1，圆柱形凸台T2，极片1/2，隔离膜3，集流体10，第一活性物质层11，第二活性物质层12，第一凹槽C1，第二凹槽C2，第一侧壁B1，第二侧壁B2，第三侧壁B3，第一凹槽的第三侧壁的轮廓线L1，第二凹槽的第三侧壁的轮廓线L2，第一凹槽C1的宽度4，第一侧边5，第二侧边6。
具体实施方式
下面将结合本公开实施方式中的附图，对本公开实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本公开一部分实施方式，而不是全部的实施方式。基于本公开中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本公开保护的范围。
请参考图1和图10，本公开实施例提供了一种电池100，该电池100包括电池外壳K、放置于电池外壳K内的卷绕式电池电芯J和电池上盖G。其中，卷绕式电池电芯J为本公开实施例所提供，具体结构在后续说明。电池外壳K可以是一上端开口的圆筒，圆筒内壁底部与卷绕式电池电芯J的负极片集流板电连接，外底部中间设有凸台T1，用以将电池负极与外接器件相连。电池上盖G是与电池外壳K相匹配的圆盘状盖，其下部设有向下突出的平面，与正极集流板电连接，正极集流板与电池外壳K之间装有绝缘密封圈，电池上盖G上部中间设有向上凸起的圆柱形凸台T2，用以将电池正极与外接器件连接。电池上盖G设有电解液注入口D，通过注入电解液实现正负极之间电子的传导，电解液注入后用密封钉密封。此种结构的电池100充放电过程中发热较小，循环利用衰减速度慢，能使得电池100使用寿命更长。通过使用本公开提供的卷绕式电池电芯J，极片的打皱现象减少，甚至无皱褶，能减小电池100电阻，使得电池100发热变慢，同时也能减少极片活性物质层脱落造成集流体裸露现象的发生，延长电池100的使用寿命。
请参考图2，本公开实施例提供了一种卷绕式电池电芯J，该卷绕式电池电芯J包括 隔离膜3和本公开实施例提供的极片1和极片2，极片1和极片2可以为正极片和负极片，隔离膜3通常是具有纳米级微孔的高分子材料，设置在极片1和极片2之间，将两个极片隔离开，既能避免因正负极接触而导致的短路问题，同时又能使电解质离子通过。极片1、隔离膜3和极片2层叠设置，由专用卷绕机卷绕制成卷绕式电池电芯J。通过使用本公开提供的极片，极片的打皱现象减小，甚至无皱褶，能减少极片活性物质层脱落，延长电芯的使用寿命。
请参考图3和图4，本公开提供了一种极片，该极片包括集流体10和涂覆在集流体10表面的第一活性物质层11。第一活性物质层11设有第一凹槽C1，第一凹槽C1包括第一侧壁B1、第二侧壁B2和第三侧壁B3。第一侧壁B1和第二侧壁B2相对设置且互相平行，第三侧壁B3连接第一侧壁B1和第二侧壁B2，第一侧壁B1、第二侧壁B2和第三侧壁B3围合形成第一凹槽C1。第一侧壁B1到第二侧壁B2的垂直距离为第一凹槽C1的宽度4，第三侧壁B3在集流体10表面的正投影的形状为第三侧壁B3的轮廓线L1，轮廓线L1的长度大于第一凹槽C1的宽度4。
通过使第三侧壁B3的轮廓线L1的长度大于第一凹槽C1的宽度，使得第一凹槽C1的周长变长，使得第一凹槽C1处的集流体10的面积增大，辊压时第一凹槽C1处的集流体10受力面积变大，单位面积内第一活性物质层11对集流体10的压力减小，集流体10的延伸率减少，从而减少集流体10出现打皱的现象。
一种实施例中，请参考图3、图5至图8，第三侧壁B3的轮廓线L1为曲线或者直线。通过将轮廓线L1的线型设置为曲线或者直线，可以增大集流体10的受力面积，减小单位面积内集流体10受到的压力大小，进一步减小集流体10延伸率。
一种实施例中，请参考图5，第三侧壁B3的轮廓线L1为直线，该直线与第一侧壁B1和第二侧壁B2不垂直，具有相对的夹角而呈倾斜状。
一种实施例中，请参考图3，第三侧壁B3的轮廓线L1为曲线包括：第三侧壁B3的轮廓线L1为独立的弧线。根据本公开的一些实施例，轮廓线L1为圆弧线，圆弧线的半径为第一凹槽C1的宽度4的一半，此时第一凹槽C1的周长最长，第一凹槽C1处的集流体10的受力面积最大，集流体10打皱程度最轻。其他实施例中，圆弧线的半径也可大于或小于第一凹槽C1的宽度4的一半。
另一种实施例中，请参考图6，第三侧壁B3的轮廓线L1为曲线包括:第三侧壁B3的轮廓线L1为S形曲线，该S形曲线由两个直径相等的半圆弧组成，所述半圆弧的直径为所述第一凹槽C1宽度的一半。
另一种实施例中，请参考图7，第三侧壁B3的轮廓线L1为曲线包括：第三侧壁B3 的轮廓线L1为弧线与直线的组合，弧线可以是四分之一圆弧、二分之一圆弧等任意的弧线，直线可以是与第一侧壁B1垂直或倾斜的直线。其他实施例中，第三侧壁B3的轮廓线L1为曲线还可以包括任意形状的自由曲线。
一种实施例中，请参考图3和图4，集流体10包括相对的第一侧边5和第二侧边6，第一凹槽C1和第二凹槽C2由第一侧边5向第二侧边6延伸，第一凹槽C1的轮廓线L1为曲线且第一凹槽C1的轮廓线L1由第一侧边5向第二侧边6凹进，第二凹槽C2与第一凹槽C1具有相同的结构。
一种实施例中，请参考图8和图9，集流体10包括相对的第一侧边5和第二侧边6，极片还包括第二活性物质层12，第二活性物质层12设置于集流体10之背向第一活性物质层11的表面，第二活性物质层12设有与第一凹槽C1相同的第二凹槽C2。
一种实施例中，请参考图8，第一凹槽C1的轮廓线L1由第一侧边5向第二侧边6延伸，第一凹槽C1的第三侧壁B3的轮廓线L1由第一侧边5向第二侧边6凹进。第二凹槽C2由第二侧边6向第一侧边5延伸，第二凹槽C2的第三侧壁的轮廓线L2由第二侧边6向第一侧边5凹进。
一种实施例中，请参考图3和图4，第一凹槽C1与第二凹槽C2正对设置。
一种实施例中，请参考图8和图9，第一凹槽C1与第二凹槽C2交错设置。
以上所揭露的仅为本公开一种较佳实施例而已，当然不能以此来限定本公开之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本公开权利要求所作的等同变化，仍属于公开所涵盖的范围。

Claims (10)

  1. 一种极片，其中，包括集流体和涂覆在所述集流体表面的第一活性物质层，所述第一活性物质层设有第一凹槽，所述第一凹槽包括第一侧壁、第二侧壁和第三侧壁，所述第一侧壁和所述第二侧壁相对设置且互相平行，所述第三侧壁连接所述第一侧壁和所述第二侧壁，所述第一侧壁、所述第二侧壁和所述第三侧壁围合形成所述第一凹槽，所述第一侧壁到所述第二侧壁的垂直距离为所述第一凹槽的宽度，所述第三侧壁在所述集流体的表面的正投影的形状为所述第三侧壁的轮廓线，所述轮廓线的长度大于所述第一凹槽的宽度。
  2. 如权利要求1所述的极片，其中，所述轮廓线为曲线或者直线。
  3. 如权利要求2所述的极片，其中，所述轮廓线为曲线包括：所述曲线为独立的弧线或者直线与弧线的组合。
  4. 如权利要求3所述的极片，其中，当所述轮廓线为圆弧线时，所述圆弧线的半径为所述第一凹槽的宽度的一半。
  5. 如权利要求2所述的极片，其中，所述集流体包括相对的第一侧边和第二侧边，所述第一凹槽自所述第一侧边向所述第二侧边的方向延伸；所述轮廓线为曲线时，所述轮廓线朝向所述第二侧边的方向凹进。
  6. 如权利要求5所述的极片，其中，所述极片还包括第二活性物质层，所述第二活性物质层设置于所述集流体之背向所述第一活性物质层的表面，所述第二活性物质层设有与所述第一凹槽相同的第二凹槽。
  7. 如权利要求6所述的极片，其中，所述第二凹槽与所述第一凹槽正对或交错设置。
  8. 如权利要求6或7所述的极片，其中，所述第二凹槽自所述第二侧边向所述第一侧边的方向延伸。
  9. 一种卷绕式电池电芯，其中，包括隔离膜和如权利要求1-8任一项所述的极片，两片所述极片之间设有所述隔离膜。
  10. 一种电池，其中，包括权利要求9所述的卷绕式电池电芯。
PCT/CN2021/086147 2020-05-09 2021-04-09 极片、卷绕式电池电芯和电池 WO2021227729A1 (zh)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP21804427.9A EP4148836A1 (en) 2020-05-09 2021-04-09 Pole piece, wound-type battery cell, and battery
JP2022567758A JP7459300B2 (ja) 2020-05-09 2021-04-09 電極シート、捲回式電池セル及び電池
KR1020227042986A KR20230009442A (ko) 2020-05-09 2021-04-09 극 단편, 권취형 배터리 셀, 및 배터리
US17/977,043 US20230052214A1 (en) 2020-05-09 2022-10-31 Electrode sheet, winding battery core, and battery

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202020761606.8 2020-05-09
CN202020761606.8U CN212380442U (zh) 2020-05-09 2020-05-09 极片、卷绕式电池电芯和电池

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/977,043 Continuation US20230052214A1 (en) 2020-05-09 2022-10-31 Electrode sheet, winding battery core, and battery

Publications (1)

Publication Number Publication Date
WO2021227729A1 true WO2021227729A1 (zh) 2021-11-18

Family

ID=74176825

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/086147 WO2021227729A1 (zh) 2020-05-09 2021-04-09 极片、卷绕式电池电芯和电池

Country Status (6)

Country Link
US (1) US20230052214A1 (zh)
EP (1) EP4148836A1 (zh)
JP (1) JP7459300B2 (zh)
KR (1) KR20230009442A (zh)
CN (1) CN212380442U (zh)
WO (1) WO2021227729A1 (zh)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN212380442U (zh) * 2020-05-09 2021-01-19 比亚迪股份有限公司 极片、卷绕式电池电芯和电池
CN114766066A (zh) * 2021-03-17 2022-07-19 宁德新能源科技有限公司 极片及其制备方法、电池、电子装置
EP4336580A1 (en) * 2021-05-08 2024-03-13 Ningde Amperex Technology Limited Battery cell and electrical device
WO2024057629A1 (ja) * 2022-09-15 2024-03-21 パナソニックエナジー株式会社 蓄電装置用電極板および蓄電装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104332589A (zh) * 2014-08-28 2015-02-04 东莞新能源科技有限公司 极片及其制备方法
CN104600250A (zh) * 2014-11-21 2015-05-06 天津力神电池股份有限公司 锂离子电池多极耳极片制备方法、极组制备方法及电池
CN205303580U (zh) * 2016-01-22 2016-06-08 宁德时代新能源科技股份有限公司 一种锂离子电池极片及含有该极片的锂离子电池
KR20160089656A (ko) * 2015-01-20 2016-07-28 주식회사 엘지화학 관통구가 천공되어 있는 집전체를 포함하는 이차전지
CN107546420A (zh) * 2016-06-24 2018-01-05 宁德时代新能源科技股份有限公司 卷绕式电芯
CN207611809U (zh) * 2017-11-13 2018-07-13 深圳市比克动力电池有限公司 一种锂离子电池正极极片及锂离子电池
CN212380442U (zh) * 2020-05-09 2021-01-19 比亚迪股份有限公司 极片、卷绕式电池电芯和电池

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10302119A1 (de) 2003-01-21 2004-07-29 Epcos Ag Elektrode für eine elektrochemische Zelle, Elektrodenwickel und elektrochemische Zelle
JP2012181978A (ja) 2011-03-01 2012-09-20 Hitachi Ltd 非水電解液電池
JP2013134894A (ja) 2011-12-26 2013-07-08 Toyota Industries Corp 電極、蓄電装置、車両、及び電極の製造方法
WO2014034708A1 (ja) 2012-08-29 2014-03-06 シャープ株式会社 電極板および二次電池
JP2015146248A (ja) 2014-02-03 2015-08-13 トヨタ自動車株式会社 非水電解質二次電池
JP2019003725A (ja) 2017-06-12 2019-01-10 株式会社豊田自動織機 電極の製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104332589A (zh) * 2014-08-28 2015-02-04 东莞新能源科技有限公司 极片及其制备方法
CN104600250A (zh) * 2014-11-21 2015-05-06 天津力神电池股份有限公司 锂离子电池多极耳极片制备方法、极组制备方法及电池
KR20160089656A (ko) * 2015-01-20 2016-07-28 주식회사 엘지화학 관통구가 천공되어 있는 집전체를 포함하는 이차전지
CN205303580U (zh) * 2016-01-22 2016-06-08 宁德时代新能源科技股份有限公司 一种锂离子电池极片及含有该极片的锂离子电池
CN107546420A (zh) * 2016-06-24 2018-01-05 宁德时代新能源科技股份有限公司 卷绕式电芯
CN207611809U (zh) * 2017-11-13 2018-07-13 深圳市比克动力电池有限公司 一种锂离子电池正极极片及锂离子电池
CN212380442U (zh) * 2020-05-09 2021-01-19 比亚迪股份有限公司 极片、卷绕式电池电芯和电池

Also Published As

Publication number Publication date
JP2023525735A (ja) 2023-06-19
CN212380442U (zh) 2021-01-19
EP4148836A1 (en) 2023-03-15
KR20230009442A (ko) 2023-01-17
JP7459300B2 (ja) 2024-04-01
US20230052214A1 (en) 2023-02-16

Similar Documents

Publication Publication Date Title
WO2021227729A1 (zh) 极片、卷绕式电池电芯和电池
WO2021227728A1 (zh) 极片、卷绕式电池电芯和电池
CN101271985B (zh) 可再充电电池及其制造方法
US10673059B2 (en) Method for manufacturing electrode and method for manufacturing secondary battery
JPH11214027A (ja) 陽極と陰極の容量比を補償した二次電池
US8709639B2 (en) Rechargeable battery
US20170125790A1 (en) Method for manufacturing electrode and method for manufacturing secondary battery
WO2023236592A1 (zh) 一种卷绕电池和电子设备
CN216354298U (zh) 一种极片、叠片电芯、电池及电子产品
CN107482156A (zh) 一种大单体锂离子电池
CN109273776B (zh) 一种电芯膜袋封装方法、电池制备方法及电池
CN113381080B (zh) 一种电池卷芯的制作方法及电池卷芯
JP2006108096A (ja) リチウム二次電池
JP4686807B2 (ja) 捲回式電池
WO2020248936A1 (zh) 一种电化学储能器件
CN106571443A (zh) 一种电池极片辊压装置及电池极片
KR102188429B1 (ko) 전극 활물질 미코팅부를 포함하는 젤리-롤형 전극조립체
CN207038604U (zh) 一种耐高压锂离子电池隔膜
CN209947673U (zh) 一种电化学储能器件
WO2024065362A1 (zh) 电化学装置及用电设备
CN110534799B (zh) 电池及电池盖板组件
JP2020535611A (ja) 捲回型電池セル
JP2015015245A (ja) 湾曲面を有するバッテリー
JP2024081686A (ja) 電極シート、捲回式電池セル及び電池
CN209282286U (zh) 锂离子电池

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21804427

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2022567758

Country of ref document: JP

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20227042986

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2021804427

Country of ref document: EP

Effective date: 20221209