WO2017117748A1 - 二次电池 - Google Patents

二次电池 Download PDF

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Publication number
WO2017117748A1
WO2017117748A1 PCT/CN2016/070298 CN2016070298W WO2017117748A1 WO 2017117748 A1 WO2017117748 A1 WO 2017117748A1 CN 2016070298 W CN2016070298 W CN 2016070298W WO 2017117748 A1 WO2017117748 A1 WO 2017117748A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
width
tab
width direction
package
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PCT/CN2016/070298
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English (en)
French (fr)
Inventor
金鑫
陶涛
席杰
Original Assignee
宁德新能源科技有限公司
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Publication date
Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN201680069506.5A priority Critical patent/CN108886126B/zh
Priority to PCT/CN2016/070298 priority patent/WO2017117748A1/zh
Publication of WO2017117748A1 publication Critical patent/WO2017117748A1/zh
Priority to US15/994,190 priority patent/US10886570B2/en
Priority to US17/100,639 priority patent/US11688885B2/en

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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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
    • 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 invention relates to the field of batteries, and more particularly to a secondary battery.
  • the sealing sheet 3 in the prior art secondary battery is of a conventional rectangular shape in order to ensure that the sealing sheet can be effectively sealed by the top of the packaging bag 2.
  • an object of the present invention is to provide a secondary battery which can realize a safety seal between a package and a wound bare cell, and at the same time prevent the wound bare cell from being isolated during winding forming.
  • the film interferes with the sealing sheet to improve winding efficiency and winding quality.
  • the sealing sheet encloses a portion of the tab of the wound bare cell for sealingly exposing the tab of the wound bare cell from the packaging bag of the secondary battery, having: a package portion located in the secondary battery The packaging area of the packaging bag; and the extending portion is disposed inside the packaging bag.
  • the lower side edge of the package portion in the up-and-down direction is spaced apart from the upper side edge of the separator in the up-and-down direction, thereby preventing the separator from interfering with the package portion and the package when the secondary battery is packaged, thereby improving the pair.
  • the wound bare cell 1 includes a separator 11 and a tab 12.
  • the sealing sheet 3 encloses a portion of the tab 12 of the wound bare cell 1 for sealingly extending the tab 12 of the wound bare cell 1 from the packaging bag 2 of the secondary battery, having: the package portion 31 The package area P of the packaging bag 2 of the secondary battery; and the extending portion 32 are disposed inside the packaging bag 2.
  • the first width W1 of the encapsulation portion 31 in the width direction W is greater than the second width W2 of the tab 12, and the third width W3 of the insertion portion 32 in the width direction W is not less than the second width W2 of the tab 12 and extends.
  • the third width W3 of the portion 32 in the width direction W is smaller than the first width W1 of the package portion 31, and the outer edge of the insertion portion 32 in the width direction W is spaced apart from the isolation film 11 in the width direction W, and the edge of the package portion 31
  • the lower side edge of the up-down direction L and the upper side edge of the separator 11 are spaced apart in the up-down direction L.
  • the first width W1 of the package portion 31 in the width direction W is larger than the second width W2 of the tab 12, and the package portion 31 is located in the package region P of the package 2 of the secondary battery Therefore, the tab 12 of the wound bare cell 1 is sealed from the packaging bag 2 of the secondary battery, and after the package, the secondary battery can be prevented from leaking at the portion where the tab 12 protrudes from the package 2.
  • the liquid insertion portion 32 wraps the portion of the tab 12 of the wound bare cell 1 inside the package 2 to prevent internal short circuit and corrosion of the battery caused by excessive exposure of the tab 12; meanwhile, the extending portion 32 is along the width direction.
  • the extending portion 32 is spaced apart from the outer edge in the width direction W to the outer edge of the tab 12 in the width direction W by a first distance D1. , 0mm ⁇ D1 ⁇ 10mm.
  • the projecting portion 32 is spaced apart from the inner edge of the width direction W to the inner edge of the tab 12 in the width direction W by a second distance D2. , 0mm ⁇ D2 ⁇ 10mm.
  • the first length L1 of the projecting portion 32 in the up and down direction L 0.2 mm ⁇ L1 ⁇ 10 mm.
  • the rounded portion C is provided between the outer edge of the extending portion 32 in the width direction W and the lower side edge of the package portion 31 in the up and down direction L. .
  • the round corner C can ensure that the sealing sheet 3 does not scratch or tear the separator, thereby ensuring the sealing.
  • the cut-out portion of the sheet extending portion 32 is easily removed during the molding process.
  • the radius of the rounded corner C may be 0 mm to 10 mm.
  • the lower edge of the extending portion 32 in the up and down direction L extends at least until the tab 12 protrudes from the wound bare cell 1.
  • the lower side edge of the extending portion 32 extends to a position where the tab 12 protrudes from the pole piece of the wound bare cell 1, and can wrap the portion of the tab 12 inside the package 2 to avoid internal short circuit of the secondary battery and Corrosion of the ear 12 .
  • the sealing sheet 3 is bilaterally symmetrical with respect to the axis A of the tab 12 parallel to the vertical direction L.
  • the package 2 of the secondary battery may be a flexible package.
  • the above flexible packaging bag is made of an aluminum plastic film.
  • the secondary battery may be a lithium ion battery, Sodium ion battery or zinc ion battery.

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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)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种二次电池，其包括卷绕式裸电芯（1）、包装袋（2）以及密封片（3）。卷绕式裸电芯（1）包括隔离膜（11）和极耳（12）。密封片（3）包裹卷绕式裸电芯（1）的极耳（12）的一部分，用于将卷绕式裸电芯（1）的极耳（12）从二次电池的包装袋（2）中密封伸出，具有：封装部（31），位于所述二次电池的包装袋（2）的封装区域（P）；以及伸入部（32），设置于包装袋（2）的内部。其中，封装部（31）沿宽度方向（W）的第一宽度（W1）大于极耳（12）的第二宽度（W2），伸入部（32）沿宽度方向（W）的第三宽度（W3）不小于极耳（12）的第二宽度（W2）且伸入部（32）沿宽度方向（W）的第三宽度（W3）小于封装部（31）的第一宽度（W1），伸入部（32）沿宽度方向（W）的外侧缘与隔离膜（11）在宽度方向（W）上间隔开，且封装部（31）的沿上下方向（L）的下侧缘与隔离膜（11）的上侧缘在上下方向（L）上间隔开。

Description

二次电池 技术领域
本发明涉及电池领域，尤其涉及一种二次电池。
背景技术
参照图1，现有技术的二次电池中的密封片3为常规的矩形，是为了保证密封片可以有效的被包装袋2的顶部封印。
然而，如果密封片3边缘和隔离膜11相距太近，就会有很大概率使得密封片和隔膜内圈发生干涉(如图1中的干涉区域S)，影响隔离膜11的卷绕，降低卷绕优率。
现有技术还可以减少密封片3的肩宽来减少和隔离膜11的干涉，但是密封片3的肩宽不能无限减少，目前1.0mm的肩宽已经是极限了，再减少会造成封装漏液的风险。
发明内容
鉴于背景技术中存在的问题，本发明的目的在于提供一种二次电池，其能实现包装袋与卷绕式裸电芯的安全密封，同时避免卷绕式裸电芯在卷绕成型时隔离膜与密封片发生干涉，提高卷绕效率和卷绕质量。
为了实现上述目的，本发明提供了一种二次电池，其包括卷绕式裸电芯、包装袋以及密封片。
卷绕式裸电芯包括隔离膜和极耳。
密封片包裹卷绕式裸电芯的极耳的一部分，用于将卷绕式裸电芯的极耳从二次电池的包装袋中密封伸出，具有：封装部，位于所述二次电池的包装袋的封装区域；以及伸入部，设置于包装袋的内部。
其中，封装部沿宽度方向的第一宽度大于极耳的第二宽度，伸入部沿宽度方向的第三宽度不小于极耳的第二宽度且伸入部沿宽度方向的第三宽度小于封装部的第一宽度，伸入部沿宽度方向的外侧缘与隔离膜在宽度方向上 间隔开，且封装部的沿上下方向的下侧缘与隔离膜的上侧缘在上下方向上间隔开。
本发明的有益效果如下：
在根据本发明的二次电池中，封装部沿宽度方向的第一宽度大于极耳的第二宽度，且封装部位于所述二次电池的包装袋的封装区域，从而使卷绕式裸电芯的极耳从二次电池的包装袋中密封伸出，经过封装后能够避免二次电池在极耳从包装袋中伸出的部位处漏液；伸入部包裹卷绕式裸电芯的极耳位于包装袋内部的部分，防止过多极耳裸露造成的电池内部短路和腐蚀；同时，伸入部沿宽度方向的第三宽度不小于极耳的第二宽度且伸入部沿宽度方向的第三宽度小于封装部的第一宽度，并保证伸入部沿宽度方向的外侧缘与隔离膜在宽度方向上间隔开，这样能够避免卷绕式裸电芯在卷绕成型时隔离膜与伸入部沿宽度方向的外侧缘发生干涉，提高卷绕效率和卷绕质量；由于伸入部的第三宽度的缩小，可以提高二次电池的宽度以及极耳间隔的极限尺寸，增加产品尺寸的多样性；封装部的沿上下方向的下侧缘与隔离膜的上侧缘在上下方向上间隔开，能够避免二次电池在封装时隔离膜与封装部以及包装袋干涉，提高了对极耳封装的密封效果。
附图说明
图1为现有技术的二次电池的剖视图；
图2为根据本发明的二次电池的立体图，其中包装袋省略；
图3为根据本发明的二次电池的剖视图，其中包装袋省略；
图4为图3圆圈部分的放大图；
图5为根据本发明的二次电池的示意图。
其中，附图标记说明如下：
1 卷绕式裸电芯         L1 第一长度
 11 隔离膜             D1 第一距离
 12 极耳               D2 第二距离
2 包装袋               W 宽度方向
3 密封片               L 上下方向
 31 封装部             C 圆角
 32 伸入部              A 轴线
W1 第一宽度             S 干涉区域
W2 第二宽度             P 封装区域
W3第三宽度
具体实施方式
下面参照附图来详细说明本发明的二次电池。
参照图2至图5，根据本发明的二次电池包括卷绕式裸电芯1、包装袋2以及密封片3。
卷绕式裸电芯1包括隔离膜11和极耳12。
密封片3包裹卷绕式裸电芯1的极耳12的一部分，用于将卷绕式裸电芯1的极耳12从二次电池的包装袋2中密封伸出，具有：封装部31，位于所述二次电池的包装袋2的封装区域P；以及伸入部32，设置于包装袋2的内部。
其中，封装部31沿宽度方向W的第一宽度W1大于极耳12的第二宽度W2，伸入部32沿宽度方向W的第三宽度W3不小于极耳12的第二宽度W2且伸入部32沿宽度方向W的第三宽度W3小于封装部31的第一宽度W1，伸入部32沿宽度方向W的外侧缘与隔离膜11在宽度方向W上间隔开，且封装部31的沿上下方向L的下侧缘与隔离膜11的上侧缘在上下方向L上间隔开。
在根据本发明的二次电池中，封装部31沿宽度方向W的第一宽度W1大于极耳12的第二宽度W2，且封装部31位于所述二次电池的包装袋2的封装区域P，从而使卷绕式裸电芯1的极耳12从二次电池的包装袋2中密封伸出，经过封装后能够避免二次电池在极耳12从包装袋2中伸出的部位处漏液；伸入部32包裹卷绕式裸电芯1的极耳12位于包装袋2内部的部分，防止极耳12过多裸露造成的电池内部短路和腐蚀；同时，伸入部32沿宽度方向W的第三宽度W3不小于极耳12的第二宽度W2且伸入部32沿宽度方向W的第三宽度W3小于封装部31的第一宽度W1，并保证伸入部32沿宽度方向W的外侧缘与隔离膜11在宽度方向W上间隔开，这样能够避免卷绕式裸电芯1在卷绕成型时隔离膜11与伸入部32沿宽度方向W的外侧缘发 生干涉，提高卷绕效率和卷绕质量；由于伸入部32的第三宽度W3的缩小，可以提高二次电池的宽度以及极耳12间隔的极限尺寸，增加产品尺寸的多样性；封装部31的沿上下方向L的下侧缘与隔离膜11的上侧缘在上下方向L上间隔开，能够避免二次电池在封装时隔离膜11与封装部31以及包装袋2干涉，提高了对极耳12封装的密封效果。
在根据本发明的二次电池中，参照图4，在一实施例中，伸入部32沿宽度方向W的外侧缘到极耳12的沿宽度方向W的外侧缘之间间隔第一距离D1，0mm≤D1≤10mm。
在根据本发明的二次电池中，参照图4，在一实施例中，伸入部32沿宽度方向W的内侧缘到极耳12的沿宽度方向W的内侧缘之间间隔第二距离D2，0mm≤D2≤10mm。
在根据本发明的二次电池中，参照图4，在一实施例中，伸入部32沿上下方向L的第一长度L1，0.2mm≤L1<10mm。
在根据本发明的二次电池中，参照图4，在一实施例中，伸入部32沿宽度方向W的外侧缘与封装部31沿上下方向L的下侧缘之间设有圆角C。在密封片3的成型过程中或者成型后，需要切除部分材料以形成伸入部32，而圆角C能保证密封片3不会对隔离膜造成划痕或撕裂，从而也确保了在密封片伸入部32成型过程中切除部分的易去除。
在根据本发明的二次电池中，在一实施例中，圆角C的半径可为0mm～10mm。
在根据本发明的二次电池中，参照图3和图4，在一实施例中，伸入部32沿上下方向L的下侧缘至少延伸至极耳12突出于卷绕式裸电芯1的极片的位置。伸入部32的下侧缘延伸至极耳12突出于卷绕式裸电芯1的极片的位置，能够包裹极耳12在包装袋2内部的部分，避免所述二次电池的内部短路和极耳12的腐蚀。
在根据本发明的二次电池中，参照图4，在一实施例中，密封片3相对极耳12的平行于上下方向L的轴线A左右对称。
在根据本发明的二次电池中，在一实施例中，所述二次电池的包装袋2可为软包装袋。上述软包装袋由铝塑膜制成。
在根据本发明的二次电池中，在一实施例中，二次电池可为锂离子电池、 钠离子电池或锌离子电池。

Claims (10)

  1. 一种二次电池，包括：
    卷绕式裸电芯(1)，包括隔离膜(11)和极耳(12)；
    包装袋(2)；以及
    密封片(3)，包裹卷绕式裸电芯(1)的极耳(12)的一部分，用于将卷绕式裸电芯(1)的极耳(12)从二次电池的包装袋(2)中密封伸出，具有：
    封装部(31)，位于所述二次电池的包装袋(2)的封装区域(P)；以及
    伸入部(32)，设置于包装袋(2)的内部；
    其特征在于，
    封装部(31)沿宽度方向(W)的第一宽度(W1)大于极耳(12)的第二宽度(W2)，伸入部(32)沿宽度方向(W)的第三宽度(W3)不小于极耳(12)的第二宽度(W2)且伸入部(32)沿宽度方向(W)的第三宽度(W3)小于封装部(31)的第一宽度(W1)，伸入部(32)沿宽度方向(W)的外侧缘与隔离膜(11)在宽度方向(W)上间隔开，且封装部(31)的沿上下方向(L)的下侧缘与隔离膜(11)的上侧缘在上下方向(L)上间隔开。
  2. 根据权利要求1所述的二次电池，其特征在于，伸入部(32)沿宽度方向(W)的外侧缘到极耳(12)的沿宽度方向(W)的外侧缘之间间隔第一距离(D1)，0mm≤D1≤10mm。
  3. 根据权利要求1所述的二次电池，其特征在于，伸入部(32)沿宽度方向(W)的内侧缘到极耳(12)的沿宽度方向(W)的内侧缘之间间隔第二距离(D2)，0mm≤D2≤10mm。
  4. 根据权利要求1所述的二次电池，其特征在于，伸入部(32)沿上下方向(L)的第一长度(L1)，0.2mm≤L1<10mm。
  5. 根据权利要求1所述的二次电池，其特征在于，伸入部(32)沿宽度方向(W)的外侧缘与封装部(31)沿上下方向(L)的下侧缘之间设有圆角(C)。
  6. 根据权利要求4所述的二次电池，其特征在于，圆角(C)的半径为0mm～10mm。
  7. 根据权利要求1所述的二次电池，其特征在于，伸入部(32)沿上下方向(L)的下侧缘至少延伸至极耳(12)突出于卷绕式裸电芯(1)的极片的位置。
  8. 根据权利要求1-7中任一项所述的二次电池，其特征在于，密封片(3)相对极耳(12)的平行于上下方向(L)的轴线(A)左右对称。
  9. 根据权利要求1所述的二次电池，其特征在于，所述二次电池的包装袋(2)为软包装袋。
  10. 根据权利要求1所述的二次电池，其特征在于，二次电池为锂离子电池、钠离子电池或锌离子电池。
PCT/CN2016/070298 2016-01-06 2016-01-06 二次电池 WO2017117748A1 (zh)

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