WO2017177358A1 - 包装封印结构及其制备方法及软包装电池 - Google Patents

包装封印结构及其制备方法及软包装电池 Download PDF

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Publication number
WO2017177358A1
WO2017177358A1 PCT/CN2016/078950 CN2016078950W WO2017177358A1 WO 2017177358 A1 WO2017177358 A1 WO 2017177358A1 CN 2016078950 W CN2016078950 W CN 2016078950W WO 2017177358 A1 WO2017177358 A1 WO 2017177358A1
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WO
WIPO (PCT)
Prior art keywords
layer
package
packaging film
insulating
seal structure
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2016/078950
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English (en)
French (fr)
Inventor
郭培培
何平
赵义
彭业军
程文强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Priority to PCT/CN2016/078950 priority Critical patent/WO2017177358A1/zh
Priority to CN201680084348.0A priority patent/CN109417203B/zh
Publication of WO2017177358A1 publication Critical patent/WO2017177358A1/zh
Priority to US16/157,181 priority patent/US11011789B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01M50/10—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/121—Organic 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/122—Composite material consisting of a mixture of organic and inorganic materials
    • 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
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • 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
    • H01M50/193—Organic material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the invention relates to the field of batteries, in particular to a package sealing structure, a preparation method thereof and a flexible packaging battery.
  • a conventional packaging seal structure 1 includes two layers of packaging films 11 that are heat sealed together, and each layer of the packaging film 11 includes an insulating protective layer 111 on the outer side, an insulating heat seal layer 112 on the inner side, and a laminate.
  • the core metal layer 113 is between the insulating protective layer 111 and the insulating heat seal layer 112.
  • the insulating heat seal layers 112 of the two layers of the packaging film 11 face each other and are melted integrally to form an insulating fusion layer 13 for sealingly bonding the two layers of the packaging film 11 together.
  • the end faces of the corresponding core metal layers 113 of the package peripheral region 12 are pasted with an insulating paste S to prevent short-circuiting with the outside.
  • the package sealing structure 1 is only suitable for the adhesive coating of the edge of the package peripheral region 12 which is a straight edge, and it is difficult to achieve the adhesive coating of the insulating paste S for the L-shaped or round-shaped shaped edge seal.
  • the adhesive insulation S increases the overall width dimension of the battery core, resulting in loss of energy density and increased material cost of the battery core.
  • an object of the present invention is to provide a package sealing structure, a preparation method thereof and a flexible packaging battery.
  • the packaging sealing structure has a simple structure and a wide application range, and can be insulated and pasted for various shapes of edge sealing.
  • the sealing improves the insulation effect on the edge of the packaging seal structure and prevents short circuit from the outside.
  • Another object of the present invention is to provide a package sealing structure, a preparation method thereof and a flexible packaging battery.
  • the preparation method of the packaging sealing structure is simple in operation, and the energy density of the battery core is improved when applied to a flexible packaging battery.
  • Still another object of the present invention is to provide a package seal structure, a preparation method thereof, and a flexible package battery, which can be easily and efficiently adapted to mass production and reduce costs.
  • the present invention provides a package sealing structure comprising two layers of packaging films which are heat sealed together, each layer of packaging film comprising: an insulating protective layer on the outside; an insulating heat sealing layer , located on the inner side; and a core metal layer laminated between the insulating protective layer and the insulating heat seal layer.
  • the insulating heat seal layers of the two layers of the packaging film face each other and are melted into one body to form an insulating fusion layer which seals and bonds the two layers of the packaging film together.
  • the insulating fusion layer is formed with an overflow portion that overflows from the edge of the insulating fusion layer to the peripheral edge of the package sealing structure to the outer end surface of the core metal layer of the two-layer packaging film and the outer end surface of the core metal layer of the two-layer packaging film It is completely covered so that the outer end faces of the core metal layers of the two-layer packaging film are insulated from the outside.
  • the present invention provides a method of preparing a package seal structure for preparing a package seal structure according to the first aspect of the present invention, comprising the steps of: providing a package seal structure to be processed, to be
  • the processed packaging seal structure comprises two layers of packaging film which are heat sealed together, and each layer of the packaging film comprises an insulating protective layer on the outer side, an insulating heat seal layer on the inner side, and a layer between the insulating protective layer and the insulating heat seal layer.
  • the two layers of packaging film are then laminated such that the insulating heat seal layers of the two layers of the packaging film face each other; and then the packaging film is simultaneously hot pressed from the upper and lower directions of the laminated packaging film by a hot pressing mechanism All of the surrounding area or part of the surrounding area of the package, the upper and lower insulating heat sealing layers corresponding to the peripheral area of the package are melted into one body to form an insulating fusion layer for sealing and bonding the two layers of packaging film together; finally, the peripheral region of the package is further hot-pressed
  • the outer edge of the core to form a core from the insulating fusion layer to the edge of the package peripheral region of the package seal structure to the core of the two-layer packaging film
  • An outer end surface of the outer end face of the outer insulating layer, an outer end surface of the core metal outer layers of the packaging film and the metal layer is completely covered spillover portion, so that the metal layers of the packaging film core layer.
  • the present invention provides a flexible package battery having the package seal structure according to the first aspect of the present invention, wherein the package seal structure houses a bare cell.
  • the insulating heat seal layers of the two layers of the packaging film face each other and are melted integrally to adhere the peripheral region of the sealed package, and the insulating fusion layer is
  • the overflow portion completely covers the outer end surface of the core metal layer of the two-layer packaging film to insulate the outer end surface of the core metal layer of the two-layer packaging film from the outside. This simple and effective insulation improves the insulation and prevents short circuits.
  • the package sealing structure of the present invention has a simple overall structure and a wide range of use, and can achieve an insulating paste seal for various shapes of the edge seal.
  • the entire package peripheral region or the partial package peripheral region of the packaging film is subjected to two hot pressing to form a core metal layer completely covering the two-layer packaging film.
  • the overflow of the outer end face is simple in operation and can increase the energy density of the battery core when applied to a flexible packaging battery.
  • the packaging sealing structure adopts the preparation method of the packaging sealing structure according to the second aspect of the present invention, thereby improving the bare cell of the flexible packaging battery Energy density.
  • the flexible packaging battery of the present invention has a simple structure, is suitable for mass production, and reduces costs.
  • Figure 1 is a partial schematic view of a prior art packaging seal structure
  • FIG. 2 is a schematic overall view of a packaging seal structure applied to a square flexible packaging battery according to the present invention
  • Figure 3 is an enlarged cross-sectional view of the circled portion of Figure 2;
  • FIG. 4 is a partial perspective view of FIG. 3, and the position corresponds to a side seal portion in the peripheral region of the package of FIG. 2, wherein the portion corresponding to the tab is a top seal portion;
  • Figure 5 is a partial schematic view of a package seal structure applied to a circular flexible packaging battery in accordance with the present invention.
  • the package sealing structure 1 comprises two layers of packaging films 11 which are heat-sealed together, each layer of packaging film 11 comprising: an insulating protective layer 111 on the outer side; an insulating heat sealing layer 112 located at The inner side; and the core metal layer 113 are laminated between the insulating protective layer 111 and the insulating heat seal layer 112.
  • the insulating heat seal layers 112 of the two layers of the packaging film 11 face each other and are melted integrally to form an insulating fusion layer 13 for sealingly bonding the two layers of the packaging film 11 together.
  • the insulating fusion layer 13 is formed with an overflow portion 131 that overflows from the insulating fusion layer 13 to the edge of the package peripheral region 12 of the package seal structure 1 to the outer end surface 1131 of the core metal layer 113 of the two-layer packaging film 11 and packages the two layers.
  • the outer end surface 1131 of the core metal layer 113 of the film 11 is completely covered so that the outer end surface 1131 of the core metal layer 113 of the two-layer packaging film 11 is insulated from the outside.
  • the insulating heat seal layers 112 of the two-layer packaging film 11 face each other and are melted integrally to adhere the sealed package peripheral region 12, and are insulated.
  • the overflow portion 131 of the fusion layer 13 completely covers the outer end surface 1131 of the core metal layer 113 of the two-layer packaging film 11 to insulate the outer end surface 1131 of the core metal layer 113 of the two-layer packaging film 11 from the outside. This simple and effective insulation improves the insulation and prevents short circuits.
  • the package sealing structure of the present invention has a simple overall structure and a wide range of use, and can achieve an insulating paste seal for various shapes of edge seals (such as L-shaped or round-shaped edge seals).
  • the overflow portion 131 may also cover at least a portion of the outer end surface 1111 of the insulating protective layer 111 of the two-layer packaging film 11 and be insulated from the two-layer packaging film 11.
  • the protective layer 111 is bonded together.
  • the overflow portion 131 may also cover the entire outer end surface 1111 of the insulating protective layer 111 of the two-layer packaging film 11.
  • the overflow portion 131 may also cover the entire outer end surface 1111 of the insulating protective layer 111 of the two-layer packaging film 11 and the outer surface 1112 in the thickness direction of the packaging film 11.
  • the package seal structure 1 may further have a punching hole 14 formed in an intermediate portion of at least one of the two layers of the packaging film 11.
  • FIG. 2 there may be two craters 14 which are respectively formed on two layers of packaging film.
  • the upper and lower craters 14 together accommodate the bare cells (not shown).
  • the insulating protective layer 111 may be made of an insulating material. Further, the insulating material may be one of insulating fibers, plastics, and rubber, preferably insulating fibers.
  • the insulating heat seal layer 112 may be made of an insulating material. Further, the insulating heat seal layer 112 may be a polymer layer.
  • the packaging film 11 may be an aluminum plastic film. Further, the insulating protective layer 111 of the packaging film 11 may be a nylon layer, the core metal layer 113 may be an aluminum foil, and the insulating heat sealing layer 112 may be a polypropylene layer.
  • a method of preparing a package seal structure according to a second aspect of the present invention is for preparing a package seal structure 1 according to the first aspect of the present invention, comprising the steps of: providing a package seal structure 1 to be processed, and the package seal structure 1 to be processed includes The two-layer packaging film 11 heat-sealed together, each layer of the packaging film 11 includes an insulating protective layer 111 on the outer side, an insulating heat seal layer 112 on the inner side, and a core laminated between the insulating protective layer 111 and the insulating heat seal layer 112.
  • the two-layer packaging film 11 is then laminated such that the insulating heat seal layers 112 of the two-layer packaging film 11 face each other; and then the upper and lower directions of the laminated packaging film 11 are utilized by the hot pressing mechanism B.
  • the entire package peripheral region 12 of the packaging film 11 or a portion of the package peripheral region 12 ie, the portion close to the bare cell
  • the upper and lower insulating heat seal layers 112 corresponding to the package peripheral region 12 are melted into one body to form two layers.
  • the packaging film 11 is sealed and bonded to the insulating fusion layer 13; finally, the outer edge of the peripheral region 12 is further heat-pressed to form a package peripheral region 1 from the insulating fusion layer 13 to the package sealing structure 1.
  • the edge of 2 overflows to the outer end surface 1131 of the core metal layer 113 of the two-layer packaging film 11 and completely covers the overflow portion 131 of the outer end surface 1131 of the core metal layer 113 of the two-layer packaging film 11 so that the two-layer packaging film
  • the outer end surface 1131 of the core metal layer 113 of 11 is insulated from the outside.
  • the entire package peripheral region 12 or the partial package peripheral region 12 of the packaging film 11 is subjected to two hot pressing to form a completely covered two-layer packaging film 11.
  • the preparation method is simple in operation and can increase the energy density of the battery core when applied to a flexible packaging battery.
  • a method of preparing a package seal structure according to the second aspect of the present invention hot pressing
  • the temperature of the hot pressing mechanism B may be set to 100 to 190 °C.
  • the pressure of the hot pressing mechanism B when the peripheral portion 12 of the packaging film 11 is heat-pressed, the pressure of the hot pressing mechanism B may be 0.02-0.6 MPa. In an embodiment, when the peripheral portion 12 of the packaging film 11 is heat-sealed, the hot pressing mechanism B may be hot pressed for 0.5-10 s. In an embodiment, the hot pressing mechanism B may be set to a temperature of 100-190 ° C when the outer edge of the package peripheral region 12 is further hot pressed.
  • the pressure of the hot pressing mechanism B may be 0.02-0.6 MPa.
  • the hot pressing mechanism B when the outer edge of the package peripheral region 12 is further hot pressed, the hot pressing mechanism B may be hot pressed for 0.5-10 s.
  • the flexible packaging battery according to the present invention has the package sealing structure 1 according to the first aspect of the present invention, and the package sealing structure 1 houses a bare cell (not shown).
  • the package sealing structure 1 employs the preparation method of the package sealing structure according to the second aspect of the present invention, thereby improving the flexible packaging The energy density of the bare cell of the battery.
  • the flexible packaging battery of the present invention has a simple structure, is suitable for mass production, and reduces costs.
  • the flexible package battery may be a square flexible package battery or a circular flexible package battery.
  • the flexible packaging battery can also be an irregularly shaped flexible packaging battery.
  • the bare cell of the flexible packaging battery has a tab R extending from the two layers of packaging film 11.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种包装封印结构及其制备方法及软包装电池。所述包装封印结构（1）包括被热封在一起的两层包装膜（11），各层包装膜（11）包括绝缘保护层（111）、绝缘热封层（112）以及核心金属层（113）。其中，在包装封印结构（1）的封装周边区域（12），两层包装膜（11）的绝缘热封层（112）彼此面对并熔融成一体，以形成将两层包装膜（11）密封粘接在一起的绝缘熔合层（13）。绝缘熔合层（13）形成有：外溢部（131），从绝缘熔合层（13）向包装封印结构（1）的封装周边区域（12）的边缘溢出到两层包装膜（11）的核心金属层（113）的外端面（1131）外并将两层包装膜（11）的核心金属层（113）的外端面（1131）完全包覆，以使两层包装膜（11）的核心金属层（113）的外端面（1131）与外部绝缘。这种简单有效地绝缘方式提高了绝缘效果，防止了与外界短路。

Description

包装封印结构及其制备方法及软包装电池 技术领域
本发明涉及电池领域，尤其涉及一种包装封印结构及其制备方法及软包装电池。
背景技术
在现有技术中，常规的包装封印结构1包括被热封在一起的两层包装膜11，各层包装膜11包括：位于外侧的绝缘保护层111、位于内侧的绝缘热封层112以及层叠于绝缘保护层111和绝缘热封层112之间的核心金属层113。其中，在包装封印结构1的封装周边区域12，两层包装膜11的绝缘热封层112彼此面对并熔融成一体，以形成将两层包装膜11密封粘接在一起的绝缘熔合层13。然后采用绝缘胶S粘贴包覆封装周边区域12的对应的核心金属层113的端面，以防止与外界短路。但是，该包装封印结构1仅适用于组成封装周边区域12的封边为直边的粘贴包覆，对于L型或圆形等异形封边难以实现绝缘胶S的粘贴包覆。另外，粘贴绝缘胶S会增加电芯的整体宽度尺寸，造成能量密度损失，且增加了电芯的物料成本。
发明内容
鉴于背景技术中存在的问题，本发明的一个目的在于提供一种包装封印结构及其制备方法及软包装电池，包装封印结构的结构简单，使用范围广，能够对各种形状的封边实现绝缘粘贴密封，提高了包装封印结构边缘的绝缘效果，防止与外界短路。
本发明的另一个目的在于提供一种包装封印结构及其制备方法及软包装电池，包装封印结构的制备方法操作简单，在应用于软包装电池时提高了电芯的能量密度。
本发明的再一个目的在于提供一种包装封印结构及其制备方法及软包装电池，软包装电池能简单有效地适于大规模生产，降低了成本。
为了实现上述目的，在第一方面，本发明提供了一种包装封印结构，其包括被热封在一起的两层包装膜，各层包装膜包括：绝缘保护层，位于外侧；绝缘热封层，位于内侧；以及核心金属层，层叠于绝缘保护层和绝缘热封层之间。其中，在包装封印结构的封装周边区域，两层包装膜的绝缘热封层彼此面对并熔融成一体，以形成将两层包装膜密封粘接在一起的绝缘熔合层。绝缘熔合层形成有：外溢部，从绝缘熔合层向包装封印结构的封装周边区域的边缘溢出到两层包装膜的核心金属层的外端面外并将两层包装膜的核心金属层的外端面完全包覆，以使两层包装膜的核心金属层的外端面与外部绝缘。
为了实现上述目的，在第二方面，本发明提供了一种包装封印结构的制备方法，其用于制备根据本发明第一方面的包装封印结构，包括步骤：提供待处理的包装封印结构，待处理的包装封印结构包括被热封在一起的两层包装膜，各层包装膜包括位于外侧的绝缘保护层、位于内侧的绝缘热封层以及层叠于绝缘保护层和绝缘热封层之间的核心金属层；然后将所述两层包装膜层叠，以使两层包装膜的绝缘热封层彼此面对；接着利用热压机构从层叠后的包装膜的上下两个方向同时热压包装膜的全部封装周边区域或部分封装周边区域，使封装周边区域对应的上下绝缘热封层熔融成一体，以形成将两层包装膜密封粘接在一起的绝缘熔合层；最后进一步热压封装周边区域的外边缘，以形成从绝缘熔合层向包装封印结构的封装周边区域的边缘溢出到两层包装膜的核心金属层的外端面外并将两层包装膜的核心金属层的外端面完全包覆的外溢部，以使两层包装膜的核心金属层的外端面与外部绝缘。
为了实现上述目的，在第三方面，本发明提供了一种软包装电池，其具有根据本发明第一方面的包装封印结构，包装封印结构内收容有裸电芯。
本发明的有益效果如下：
在根据本发明第一方面的包装封印结构中，在包装封印结构的封装周边区域，两层包装膜的绝缘热封层彼此面对并熔融成一体以粘贴密封封装周边区域，且绝缘熔合层的外溢部将两层包装膜的核心金属层的外端面完全包覆，以实现两层包装膜的核心金属层的外端面与外部的绝缘。这种简单有效地绝缘方式提高了绝缘效果，防止与外界短路。且本发明的包装封印结构的整体结构简单，使用范围广，能够对各种形状的封边实现绝缘粘贴密封。
在根据本发明第二方面的包装封印结构的制备方法中，通过对包装膜的全部封装周边区域或部分封装周边区域进行两次热压，以形成完全包覆两层包装膜的核心金属层的外端面的外溢部。该制备方法操作简单，在应用于软包装电池时能够提高电芯的能量密度。
在根据本发明的软包装电池中，通过采用根据本发明第一方面的包装封印结构，而包装封印结构采用根据本发明第二方面的包装封印结构的制备方法，从而提高了软包装电池的裸电芯的能量密度。且本发明的软包装电池的结构简单，适于大规模生产，降低了成本。
附图说明
图1是现有技术中的包装封印结构的局部示意图；
图2是根据本发明的包装封印结构应用于方形软包装电池的整体示意图；
图3是图2中的圆圈部分的放大剖开图；
图4是图3的部分立体图，且位置对应图2的封装周边区域中的侧封部位，其中对应极耳的部位为顶封部位；
图5是根据本发明的包装封印结构应用于圆形软包装电池的局部示意图。
其中，附图标记说明如下：
1包装封印结构12封装周边区域
11包装膜          13绝缘熔合层
111绝缘保护层     131外溢部
1111外端面        14冲坑
1112外表面        R极耳
112绝缘热封层     B热压机构
113核心金属层     S绝缘胶
1131外端面
具体实施方式
下面参照附图来详细说明本发明的包装封印结构及其制备方法及软包 装电池。
首先说明根据本发明第一方面的包装封印结构。
参照图2至图5，根据本发明的包装封印结构1包括被热封在一起的两层包装膜11，各层包装膜11包括：绝缘保护层111，位于外侧；绝缘热封层112，位于内侧；以及核心金属层113，层叠于绝缘保护层111和绝缘热封层112之间。其中，在包装封印结构1的封装周边区域12，两层包装膜11的绝缘热封层112彼此面对并熔融成一体，以形成将两层包装膜11密封粘接在一起的绝缘熔合层13。绝缘熔合层13形成有：外溢部131，从绝缘熔合层13向包装封印结构1的封装周边区域12的边缘溢出到两层包装膜11的核心金属层113的外端面1131外并将两层包装膜11的核心金属层113的外端面1131完全包覆，以使两层包装膜11的核心金属层113的外端面1131与外部绝缘。
在根据本发明的包装封印结构1中，在包装封印结构1的封装周边区域12，两层包装膜11的绝缘热封层112彼此面对并熔融成一体以粘贴密封封装周边区域12，且绝缘熔合层13的外溢部131将两层包装膜11的核心金属层113的外端面1131完全包覆，以实现两层包装膜11的核心金属层113的外端面1131与外部的绝缘。这种简单有效地绝缘方式提高了绝缘效果，防止与外界短路。且本发明的包装封印结构的整体结构简单，使用范围广，能够对各种形状的封边(如L型或圆形异形封边)实现绝缘粘贴密封。
根据本发明的包装封印结构1，在一实施例中，外溢部131还可覆盖到两层包装膜11的绝缘保护层111的外端面1111的至少一部分上，并与两层包装膜11的绝缘保护层111粘接在一起。
在一实施例中，参照图3至图5，外溢部131还可覆盖到两层包装膜11的绝缘保护层111的整个外端面1111上。
在一实施例中，外溢部131还可覆盖到两层包装膜11的绝缘保护层111的整个外端面1111以及包装膜11的厚度方向上的外表面1112上。
在一实施例中，参照图2，包装封印结构1还可具有：冲坑14，形成于两层包装膜11中的至少一个的中间区域。
在一实施例中，参照图2，冲坑14可为两个，分别形成于两层包装膜 11的中间区域，两层包装膜11封装时上下两个冲坑14一起收容裸电芯(未示出)。
在一实施例中，绝缘保护层111可由绝缘材料制成。进一步地，绝缘材料可为绝缘纤维、塑料、橡胶中的一种，优选为绝缘纤维。
在一实施例中，绝缘热封层112可由绝缘材料制成。进一步地，绝缘热封层112可为聚合物层。
在一实施例中，包装膜11可为铝塑膜。进一步地，包装膜11的绝缘保护层111可为尼龙层、核心金属层113可为铝箔、而绝缘热封层112可为聚丙烯层。
其次说明根据本发明第二方面的包装封印结构1的制备方法。
根据本发明第二方面的包装封印结构的制备方法用于制备根据本发明第一方面的包装封印结构1，其包括步骤：提供待处理的包装封印结构1，待处理的包装封印结构1包括被热封在一起的两层包装膜11，各层包装膜11包括位于外侧的绝缘保护层111、位于内侧的绝缘热封层112以及层叠于绝缘保护层111和绝缘热封层112之间的核心金属层113；然后将所述两层包装膜11层叠，以使两层包装膜11的绝缘热封层112彼此面对；接着利用热压机构B从层叠后的包装膜11的上下两个方向同时热压包装膜11的全部封装周边区域12或部分封装周边区域12(即靠近裸电芯的部分)，使封装周边区域12对应的上下绝缘热封层112熔融成一体，以形成将两层包装膜11密封粘接在一起的绝缘熔合层13；最后进一步热压封装周边区域12的外边缘，以形成从绝缘熔合层13向包装封印结构1的封装周边区域12的边缘溢出到两层包装膜11的核心金属层113的外端面1131外并将两层包装膜11的核心金属层113的外端面1131完全包覆的外溢部131，以使两层包装膜11的核心金属层113的外端面1131与外部绝缘。
在根据本发明第二方面的包装封印结构的制备方法中，通过对包装膜11的全部封装周边区域12或部分封装周边区域12进行两次热压，以形成完全包覆两层包装膜11的核心金属层113的外端面1131的外溢部131。该制备方法操作简单，在应用于软包装电池时能够提高电芯的能量密度。
根据本发明第二方面的包装封印结构的制备方法，在一实施例中，热压 包装膜11的封装周边区域12时，热压机构B设置的温度可为100-190℃。
在一实施例中，热压包装膜11的封装周边区域12时，热压机构B设置的压力可为0.02-0.6MPa。在一实施例中，热压包装膜11的封装周边区域12时，热压机构B热压的时间可为0.5-10s。在一实施例中，在封装周边区域12的外边缘进一步热压时，热压机构B设置的温度可为100-190℃。
在一实施例中，在封装周边区域12的外边缘进一步热压时，热压机构B设置的压力可为0.02-0.6MPa。
在一实施例中，在封装周边区域12的外边缘进一步热压时，热压机构B热压的时间可为0.5-10s。
接下来说明根据本发明第三方面的软包装电池。
根据本发明的软包装电池具有根据本发明第一方面的包装封印结构1，包装封印结构1内收容有裸电芯(未示出)。
在根据本发明第三方面的软包装电池中，通过采用根据本发明第一方面的包装封印结构1，而包装封印结构1采用根据本发明第二方面的包装封印结构的制备方法，从而提高了软包装电池的裸电芯的能量密度。且本发明的软包装电池的结构简单，适于大规模生产，降低了成本。
根据本发明第三方面的软包装电池，在一实施例中，所述软包装电池可为方形软包装电池或圆形软包装电池。当然不仅限如此，软包装电池还可为不规则形状的软包装电池。
在一实施例中，所述软包装电池的裸电芯具有从两层包装膜11中伸出的极耳R。

Claims (21)

  1. 一种包装封印结构(1)，包括被热封在一起的两层包装膜(11)，各层包装膜(11)包括：
    绝缘保护层(111)，位于外侧；
    绝缘热封层(112)，位于内侧；以及
    核心金属层(113)，层叠于绝缘保护层(111)和绝缘热封层(112)之间；
    其中，在包装封印结构(1)的封装周边区域(12)，两层包装膜(11)的绝缘热封层(112)彼此面对并熔融成一体，以形成将两层包装膜(11)密封粘接在一起的绝缘熔合层(13)；
    其特征在于，绝缘熔合层(13)形成有：外溢部(131)，从绝缘熔合层(13)向包装封印结构(1)的封装周边区域(12)的边缘溢出到两层包装膜(11)的核心金属层(113)的外端面(1131)外并将两层包装膜(11)的核心金属层(113)的外端面(1131)完全包覆，以使两层包装膜(11)的核心金属层(113)的外端面(1131)与外部绝缘。
  2. 根据权利要求1所述的包装封印结构(1)，其特征在于，
    外溢部(131)还覆盖到两层包装膜(11)的绝缘保护层(111)的外端面(1111)的至少一部分上，并与两层包装膜(11)的绝缘保护层(111)粘接在一起。
  3. 根据权利要求1所述的包装封印结构(1)，其特征在于，
    外溢部(131)还覆盖到两层包装膜(11)的绝缘保护层(111)的整个外端面(1111)上。
  4. 根据权利要求1所述的包装封印结构(1)，其特征在于，
    外溢部(131)还覆盖到两层包装膜(11)的绝缘保护层(111)的整个外端面(1111)以及包装膜(11)的厚度方向上的外表面(1112)上。
  5. 根据权利要求1所述的包装封印结构(1)，其特征在于，包装封印结构(1)还具有：冲坑(14)，形成于两层包装膜(11)中的至少一个的中间区域。
  6. 根据权利要求5所述的包装封印结构(1)，其特征在于，冲坑(14)为两个，分别形成于两层包装膜(11)的中间区域，两层包装膜(11)封装时上下两个冲坑(14)一起收容裸电芯。
  7. 根据权利要求1所述的包装封印结构(1)，其特征在于，绝缘保护层(111)由绝缘材料制成。
  8. 根据权利要求1所述的包装封印结构(1)，其特征在于，绝缘热封层(112)由绝缘材料制成。
  9. 根据权利要求8所述的包装封印结构(1)，其特征在于，绝缘热封层(112)为聚合物层。
  10. 根据权利要求1所述的包装封印结构(1)，其特征在于，包装膜(11)为铝塑膜。
  11. 根据权利要求10所述的包装封印结构(1)，其特征在于，包装膜(11)的绝缘保护层(111)为尼龙层、核心金属层(113)为铝箔、而绝缘热封层(112)为聚丙烯层。
  12. 一种包装封印结构(1)的制备方法，用于制备根据权利要求1-11中任一项所述的包装封印结构(1)，其特征在于，包括步骤：
    提供待处理的包装封印结构(1)，待处理的包装封印结构(1)包括被热封在一起的两层包装膜(11)，各层包装膜(11)包括：绝缘保护层(111)，位于外侧；绝缘热封层(112)，位于内侧；以及核心金属层(113)，层叠 于绝缘保护层(111)和绝缘热封层(112)之间；
    然后将所述两层包装膜(11)层叠，以使两层包装膜(11)的绝缘热封层(112)彼此面对；
    接着利用热压机构(B)从层叠后的包装膜(11)的上下两个方向同时热压包装膜(11)的全部封装周边区域(12)或部分封装周边区域(12)，使封装周边区域(12)对应的上下绝缘热封层(112)熔融成一体，以形成将两层包装膜(11)密封粘接在一起的绝缘熔合层(13)；
    最后进一步热压封装周边区域(12)的外边缘，以形成从绝缘熔合层(13)向包装封印结构(1)的封装周边区域(12)的边缘溢出到两层包装膜(11)的核心金属层(113)的外端面(1131)外并将两层包装膜(11)的核心金属层(113)的外端面(1131)完全包覆的外溢部(131)，以使两层包装膜(11)的核心金属层(113)的外端面(1131)与外部绝缘。
  13. 根据权利要求12所述的包装封印结构(1)的制备方法，其特征在于，热压包装膜(11)的封装周边区域(12)时，热压机构(B)设置的温度为100-190℃。
  14. 根据权利要求12所述的包装封印结构(1)的制备方法，其特征在于，热压包装膜(11)的封装周边区域(12)时，热压机构(B)设置的压力为0.02-0.6MPa。
  15. 根据权利要求12所述的包装封印结构(1)的制备方法，其特征在于，热压包装膜(11)的封装周边区域(12)时，热压机构(B)热压的时间为0.5-10s。
  16. 根据权利要求12所述的包装封印结构(1)的制备方法，其特征在于，在封装周边区域(12)的外边缘进一步热压时，热压机构(B)设置的温度为100-190℃。
  17. 根据权利要求12所述的包装封印结构(1)的制备方法，其特征在 于，在封装周边区域(12)的外边缘进一步热压时，热压机构(B)设置的压力为0.02-0.6MPa。
  18. 根据权利要求12所述的包装封印结构(1)的制备方法，其特征在于，在封装周边区域(12)的外边缘进一步热压时，热压机构(B)热压的时间为0.5-10s。
  19. 一种软包装电池，其特征在于，具有根据权利要求1-11中任一项所述的包装封印结构(1)，包装封印结构(1)内收容有裸电芯。
  20. 根据权利要求19所述的软包装电池，其特征在于，所述软包装电池为方形软包装电池或圆形软包装电池。
  21. 根据权利要求19所述的软包装电池，其特征在于，所述软包装电池的裸电芯具有从两层包装膜(11)中伸出的极耳(R)。
PCT/CN2016/078950 2016-04-11 2016-04-11 包装封印结构及其制备方法及软包装电池 Ceased WO2017177358A1 (zh)

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