WO2019196073A1 - 一种电池 - Google Patents

一种电池 Download PDF

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Publication number
WO2019196073A1
WO2019196073A1 PCT/CN2018/082885 CN2018082885W WO2019196073A1 WO 2019196073 A1 WO2019196073 A1 WO 2019196073A1 CN 2018082885 W CN2018082885 W CN 2018082885W WO 2019196073 A1 WO2019196073 A1 WO 2019196073A1
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WO
WIPO (PCT)
Prior art keywords
segment
battery
packaging film
cell
layer
Prior art date
Application number
PCT/CN2018/082885
Other languages
English (en)
French (fr)
Inventor
杨洪战
江静
曾巧
王可飞
Original Assignee
宁德新能源科技有限公司
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 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 EP18914677.2A priority Critical patent/EP3624209A4/en
Priority to CN201880088675.2A priority patent/CN111684617B/zh
Priority to PCT/CN2018/082885 priority patent/WO2019196073A1/zh
Priority to JP2020554876A priority patent/JP7434168B2/ja
Priority to US16/133,953 priority patent/US10658644B2/en
Publication of WO2019196073A1 publication Critical patent/WO2019196073A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • 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
    • H01M10/0459—Cells or batteries with folded separator between plate-like 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
    • H01M50/10—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
    • H01M50/124—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
    • H01M50/116—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
    • H01M50/129—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/136—Flexibility or foldability
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • 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
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D1/00—Multiple-step processes for making flat articles ; Making flat articles
    • B31D1/02—Multiple-step processes for making flat articles ; Making flat articles the articles being labels or tags
    • B31D1/021—Making adhesive labels having a multilayered structure, e.g. provided on carrier webs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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

  • soft-pack batteries Compared with ordinary steel-shell batteries, soft-pack batteries have the advantages of high energy density, small size, light weight and flexible design, and are therefore favored by many users and widely used in mobile portable electronic products.
  • the packaging bag of the soft pack battery is also becoming thinner and lighter.
  • the thin and light development of packaging bags will inevitably affect the safety of soft-packed batteries, and the safety of soft-packed batteries has always been the most important issue. Therefore, the battery packaging bag must be able to meet the requirements of cell insulation, corrosion resistance, water resistance, high strength and good molding.
  • the purpose of the embodiments of the present application is to provide a battery to reduce the volume of the battery, increase the energy density of the battery, and further improve the bottom molding effect of the battery, as well as the safety performance and service life of the battery.
  • An embodiment of the present application provides a battery including a battery core and a packaging film encapsulating the battery core, the packaging film including a folding portion, and the folding portion includes a surface that is adhered to the end surface of the battery core And a second segment connected to the first segment, the first segment being disposed between the second segment and the cell, the second segment comprising a multilayer packaging film.
  • the packaging film of the second stage comprises an organic layer, a metal layer, the organic layer is located on the surface of the packaging film, and the two layers of packaging film are bonded by the organic layer.
  • the second segment is pasted in the first segment.
  • a glue layer is disposed between the second segment and the first segment, and the second segment and the first segment are fixed by the glue layer.
  • the battery further includes a bonding portion, the bonding portion is disposed outside the first segment and the second segment, and the second segment and the first segment pass the The sticking part is fixed.
  • the multilayer packaging film is of a unitary structure.
  • the battery further includes a tab, and the tab is disposed opposite to the second segment on both sides of the battery.
  • the tab and the second segment are located on the same side of the battery.
  • the battery core includes a diaphragm, and the diaphragm is located between the packaging films of the second segment.
  • the packaging film of the second stage comprises an organic layer, and the organic layer is bonded to the separator.
  • the thickness of the second segment satisfies:
  • h is the thickness of the second segment
  • d is the thickness of the packaging film
  • n is an adjustment factor, -1 mm ⁇ n ⁇ 5 mm.
  • the width of the second segment in the first direction satisfies:
  • W is the width of the second segment in the first direction.
  • the battery includes a secondary lithium ion battery.
  • the folded portion includes a first segment that is bonded to the end surface of the cell and a second segment that is connected to the first segment.
  • the second segment is located outside the first segment, and the second segment includes two layers of packaging film.
  • the solution eliminates the gap between the bottom of the cell and the packaging film in the prior art, reduces the volume of the battery, and increases the energy density of the battery.
  • the shape and structure of the packaging film of the solution are relatively regular, and the battery is not easily damaged when the vacuuming process is performed, and the safety performance and the service life of the battery can be improved.
  • FIG. 1 is a cross-sectional view showing the structure of a battery according to an embodiment of the prior art
  • FIG. 2 is a cross-sectional view showing the structure of a battery according to another embodiment of the prior art
  • FIG. 3 is a cross-sectional view showing the structure of a battery according to an embodiment of the present application.
  • Figure 4 is a partial enlarged view of the battery of the embodiment shown in Figure 3;
  • FIG. 5 is a schematic structural view of a battery according to another embodiment of the present application.
  • Figure 6 is a partial cross-sectional view showing the structure of a battery in an embodiment of the present application.
  • Figure 7 is a partial cross-sectional view showing the structure of a battery in another embodiment of the present application.
  • Figure 9 is a partial enlarged view of the battery of the embodiment shown in Figure 8.
  • a battery in the prior art, includes a battery core 01, a packaging film 02 for packaging the battery core 01, and a tab 03 respectively connected to the positive electrode tab and the negative electrode tab of the battery cell 01.
  • the manufacturing process of the above battery comprises: puncturing the packaging film 02 and loading the battery 01, and encapsulating the packaging film 02 to perform liquid injection, formation and vacuuming processes.
  • a large gap is formed between the bottom of the battery cell 01 and the bottom of the packaging film.
  • the bottom of the packaging film 02 collapses, irregular wrinkles appear, resulting in poor appearance of the battery, and may even cause the pole piece to pierce the packaging film 02, resulting in damage to the packaging film 02, or the packaging film 02 squeezing the diaphragm and the pole piece
  • the positive electrode sheet is directly in contact with the negative electrode sheet, thereby causing problems such as short-circuit explosion.
  • an embodiment of the present application provides a battery including a battery core 1 and a packaging film 2 for packaging the battery core 1.
  • the packaging film 2 includes a folded portion 21, and the folded portion 21 includes electricity.
  • the battery includes a battery core 1 and a packaging film 2 for packaging the battery core 1.
  • the manufacturing process of the battery includes: forming a folded portion 21 of the packaging film 2, forming a folded portion 21 of the packaging film 2, loading the battery core 1, and encapsulating the side of the packaging film 2 except the folded portion 21 to form the package portion 22, and then forming the package portion 22, and then Injecting, forming and vacuuming processes are carried out.
  • the packaging film 2 is a sheet-like structure, which is folded after the punching process, and then the side of the packaging film 2 except the folding portion 21 is formed, and the side of the package is the packaging portion 22, Form a battery bag.
  • the area where the packaging film 2 is folded is the folded portion 21, which is opposite to the bottom of the battery cell 1 of the battery.
  • the above-mentioned folding The portion 21 is located on the side opposite to the tab.
  • the folded portion 21 includes a first segment 211 that is bonded to the end surface of the battery cell 1 and a second segment 212 that is connected to the first segment 211.
  • the first segment 211 is disposed on the second segment 212 and the battery cell 1.
  • the second section 212 includes a two-layer packaging film 2.
  • the gap between the packaging film 2 and the bottom of the battery cell 1 can be eliminated, so that the first segment 211 can be bonded to the end surface of the battery cell 1
  • the battery can be placed close to the side of the bottom of the battery core 1, and wrinkles are not easily formed, and the bottom of the battery is well formed.
  • the above battery is a soft pack battery.
  • the packaging films 2 of the second segment 212 may or may not be fixed to each other.
  • the packaging films 2 of the second segment 212 may be fixedly connected by gluing or hot pressing.
  • only the press-bonding process may be performed, and the packaging films 2 of the second segment 212 are not fixed to each other, and only the packaging film 2 is folded to form the second segment 212.
  • the packaging film 2 of the second segment 212 comprises an organic layer, a metal layer, the organic layer is located on the surface of the packaging film 2, and the two packaging films 2 are bonded by an organic layer.
  • the second section 212 can be a second section 212 that is pressed, that is, the second section 212 is fabricated by a pressing process to securely connect the two layers of the packaging film 2.
  • heat sealing may be performed to improve the structural stability of the second segment 212.
  • other processes may be used to make the second segment 212.
  • the second segment 212 is affixed to the first segment 211.
  • the second segment 212 can be folded over and attached to the outside of the first segment 211, that is, attached to the bottom of the battery.
  • the structure of the battery is more regular, and when the battery is used, the occupied area is small.
  • the second segment 212 is not easy to deploy, and the stability of the second segment 212 structure can be further improved.
  • the specific manner in which the second segment 212 is pasted on the outer side of the first segment 211 is not limited.
  • a glue layer 3 is disposed between the second segment 212 and the first segment 211 .
  • the second section 212 and the first section are fixed by the glue layer 3.
  • the second segment 212 is pasted outside the first segment 211 by providing a glue layer 3 between the second segment 212 and the first segment.
  • the battery further includes a bonding portion 4 disposed outside the first segment 211 and the second segment 212 to affix the second segment 212 to the first segment 211.
  • the two-layer packaging film 2 is of a unitary structure.
  • the second segment 212 is folded by a packaging film 2 to form a two-layer packaging film 2, as shown in FIG. 6, the packaging film 2 is a whole film, and a fold is formed in the middle of the film.
  • the two layers of the packaging film 2 are unfolded in a connected relationship.
  • the battery further includes a tab 7 disposed opposite the second segment 212 on opposite sides of the battery.
  • the tab 7 and the second segment 212 are oppositely disposed on opposite sides of the first direction 5 of the battery.
  • the first direction 5 refers to the tab 7 extending from the packaging film 2. The direction of the out.
  • this embodiment is only used as a specific embodiment. In practical applications, the position of the tab 7 can also be designed according to requirements.
  • the tab 7 and the second segment 212 are located on the same side of the battery.
  • the second segment 212 is not attached to the outside of the first segment 211 and is in an unfolded state.
  • the tab 7 and the second segment 212 are located on the same side of the battery in the second direction 6 of the battery, and the second direction 6 is specifically perpendicular to the first direction 5, the tab 7 and The second segment 212 is located on the same side of the battery.
  • the externally protruding structure of the battery cell 1 is located on the same side, so that it is convenient to install the battery and install other accessories on the battery accessory.
  • the battery cell 1 includes a pole piece 11, a diaphragm 12, and an electrolyte (not shown), and a portion of the diaphragm 12 is located between the packaging films 2 of the second section 212.
  • the second segment 212 can also fix the diaphragm 12, so that the battery cell 1 is relatively firmly fixed in the packaging film 2, reducing the relative movement between the battery cell 1 and the packaging film 2, further improving the battery. Service life.
  • the packaging film of the second stage comprises an organic layer, and the organic layer is bonded to the separator.
  • the second section of the embodiment and the diaphragm are fixed by means of hot pressing, and the fixing strength of the diaphragm and the second section can be further improved.
  • the thickness of the second segment satisfies:
  • n may be a negative value, because the method for fabricating the second segment is not specifically limited.
  • the thickness of the second segment may be smaller than that of the two-layer packaging film. thickness.
  • the width of the second segment in the first direction satisfies:
  • W is the width of the second segment in the first direction, as shown in FIG. 8 and FIG. 9, the starting point of the width measurement is the intersection of the first segment and the second segment, and the end point of the width measurement is the second segment.
  • the starting point of the width measurement is the intersection of the first segment and the second segment
  • the end point of the width measurement is the second segment.
  • the first stage can be bonded to the end surface of the battery core, thereby eliminating the gap between the bottom of the battery core and the packaging film in the prior art, reducing the volume of the battery, and improving the energy density of the battery. It also improves the bottom molding of the battery, as well as the safety and service life of the battery.
  • the first direction 5 refers to the length direction of the battery.
  • the packaging film comprises a stacked multi-layer structure comprising a metal layer and a non-metal layer, the metal layer being disposed between the non-metal layers.
  • the metal layer has a certain hardness, can maintain the shape of the packaging film, is favorable for battery molding, and can improve the strength of the packaging film and is not easy to leak; the non-metal layer adjacent to the battery core can isolate the battery core. Decomposition liquid; the non-metallic layer on the outside of the bare side is in direct contact with the outside world, so wear resistance is required to improve the service life of the battery.
  • the metal layer is an aluminum layer
  • the non-metal layer adjacent to the cell is a polypropylene layer
  • the bare outer non-metal layer is a nylon layer
  • the material having the highest mass content in the metal layer is aluminum or the material having the highest mass content in the metal layer is iron. That is, it can be an aluminum foil or an iron foil which is often said to be low in cost and easy to obtain, and the strength can satisfy the strength requirement of the battery for the packaging film.
  • packaging film material is only a specific embodiment, and the material of any one layer can be replaced with other materials as needed.
  • the specific type of battery is not limited, and the battery includes a secondary lithium 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)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请实施例公开了一种电池，以降低电池的体积，提高电池的能量密度，此外，还可以提高电池底部成型效果，以及电池的安全性能和使用寿命。该电池包括该电池包括电芯和封装电芯的包装膜，包装膜包括翻折部，翻折部包括与电芯端面贴合的第一段和与第一段连接的第二段，第一段设置于第二段和电芯之间，第二段包括多层包装膜。

Description

一种电池 技术领域
本申请涉及电池技术领域，特别是涉及一种电池及其包装膜。
背景技术
软包电池与普通钢壳电池相比，具有能量密度高、体积小、轻薄化和设计灵活等优势，因而受到很多用户青睐，被广泛应用于移动便携式电子产品中。为了提高电池能量密度，软包电池的包装袋也越来越趋于轻薄化。包装袋的轻薄化发展势必会影响到软包电池的安全性，而软包电池的安全性问题一直是人们最为重视的问题。因此，电池的包装袋必须能够满足电芯的绝缘、耐腐蚀、防水、强度高和成型良好等要求。
发明内容
本申请实施例的目的是提供一种电池，以降低电池的体积，提高电池的能量密度，此外，还可以提高电池底部成型效果，以及电池的安全性能和使用寿命。
本申请实施例提供了一种电池，该电池包括电芯和封装所述电芯的包装膜，所述包装膜包括翻折部，所述翻折部包括与所述电芯端面贴合的第一段和与所述第一段连接的第二段，所述第一段设置于所述第二段和所述电芯之间，所述第二段包括多层包装膜。
在本申请一具体实施例中，所述第二段的包装膜包含有机层、金属层，所述有机层位于所述包装膜表面，所述两层包装膜通过所述有机层粘合。
在本申请一具体实施例中，所述第二段粘贴于所述第一段。
在本申请一具体实施例中，所述第二段与所述第一段之间设置有胶层，所述第二段与所述第一段通过所述胶层固定。
在本申请一具体实施例中，所述电池还包括粘贴部，所述粘贴部设置在所述第一段与所述第二段外侧，所述第二段与所述第一段通过所述粘贴部固定。
在本申请一具体实施例中，所述多层包装膜为一体式结构。
在本申请一具体实施例中，所述电池还包括极耳，所述极耳与所述第二 段相对设置在所述电池的两侧。
在本申请一具体实施例中，所述极耳与所述第二段位于所述电池的同侧。
在本申请一具体实施例中，所述电芯包括隔膜，所述隔膜位于所述第二段的包装膜之间。
在本申请一具体实施例中，所述第二段的包装膜包含有机层，所述有机层与所述隔膜粘合。
在本申请一具体实施例中，所述第二段的厚度，满足：
h＝2d+n；
其中，h为所述第二段的厚度，d为所述包装膜的厚度，n为调整系数，-1mm≤n≤5mm。
在本申请一具体实施例中，所述第二段沿第一方向的宽度满足：
0.2mm≤W≤10mm；
其中，W为所述第二段沿第一方向的宽度。
在本申请一具体实施例中，所述电池包括二次锂离子电池。
本申请实施例中翻折部包括与电芯端面贴合的第一段和与第一段连接的第二段，第二段位于第一段的外部，第二段包括两层包装膜。该实施例中，通过在翻折部制作第二段，可以将包装膜与电芯底部之间的空隙消除，从而能够使第一段与电芯端面贴合，在进行抽真空工艺时，可以使电池紧靠电芯底部的侧面，不易形成褶皱，电池底部成型良好。此外，该方案消除了现有技术中电芯底部与包装膜之间的空隙，降低了电池的体积，提高电池的能量密度。该方案包装膜的形状结构较为规则，在进行抽真空工艺时，不易损坏电池，可以提高电池的安全性能和使用寿命。
附图说明
为了更清楚地说明本公开实施例或相关技术中的技术方案，下面将对实施例或相关技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施例，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为现有技术一实施例电池结构剖视图；
图2为现有技术另一实施例电池结构剖视图；
图3为本申请一实施例电池结构剖视图；
图4为图3所示实施例电池的局部放大图；
图5为本申请另一实施例电池结构示意图；
图6为本申请一实施例中电池结构的局部剖视图；
图7为本申请另一实施例中电池结构的局部剖视图；
图8为本申请再一实施例电池结构剖视图；
图9为图8所示实施例电池的局部放大图。
附图标记：
现有技术部分：
01-电芯；            02-包装膜；            03-极耳；
本发明实施例部分：
1-电芯；             11-极片；              12-隔膜；
2-包装膜；           21-翻折部；            211-第一段；
212-第二段；         22-封装部；            3-胶层；
4-粘贴部；           5-第一方向；           6-第二方向；
7-极耳。
具体实施方式
请参考图1和图2，现有技术中，一种电池包括电芯01、封装电芯01的包装膜02和分别与电芯01中正极片与负极片连接的极耳03。上述电池的制作工艺包括：对包装膜02冲坑并装入电芯01，封装上述包装膜02后进行注液、化成和抽真空工艺。现有技术中，将电芯01装入包装膜02后，电芯01底部与包装膜底部会形成较大的间隙。
在后续的抽真空工艺环节，若真空度较小，如图1所示，容易使电芯01底部与包装膜02底部存留较大的空间，一方面，电芯01在包装膜02内部容易晃动，电芯01与包装膜02之间产生相对位移，从而导致包装膜02损坏，降低电池的使用寿命；另一方面，降低了电池的空间利用率，降低体积能量密度；若真空度较大，如图2所示，包装膜02底部塌陷，出现不规则的褶皱，导致电池外观不良，甚至会导致极片刺破包装膜02，导致包装膜02损坏，或者包装膜02挤压隔膜和极片，使正极片与负极片直接接触，进而引起短路爆炸等问题。
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公 开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
请参考图3和图4，本申请实施例提供了一种电池，该电池包括电芯1和封装电芯1的包装膜2，包装膜2包括翻折部21，翻折部21包括与电芯1端面贴合的第一段211和与第一段211连接的第二段212，第一段211设置于第二段212和电芯1之间，第二段212包括两层包装膜2。
如图3至图5所示，本申请一实施例中，电池包括电芯1和封装电芯1的包装膜2。上述电池的制作工艺包括：对包装膜2冲坑，形成包装膜2的翻折部21，装入电芯1，封装上述包装膜2除翻折部21以外的侧边形成封装部22，然后进行注液、化成和抽真空工艺。
本申请实施例中，包装膜2为片状结构，经冲坑工艺后进行翻折，再封装包装膜2除翻折部21以外的侧边，封装的侧边即为封装部22，则可形成电池的包装袋。具体的，包装膜2进行翻折的区域即为翻折部21，该翻折部21与电池的电芯1底部相对，在如图3至图5所示的具体实施例中，上述翻折部21位于与极耳相对的一侧。
本申请实施例中翻折部21包括与电芯1端面贴合的第一段211和与第一段211连接的第二段212，第一段211设置于第二段212和电芯1之间，第二段212包括两层包装膜2。该实施例中，通过在翻折部21制作第二段212，可以将包装膜2与电芯1底部之间的空隙消除，从而能够使第一段211与电芯1端面贴合，在进行抽真空工艺时，可以使电池紧靠电芯1底部的侧面，不易形成褶皱，电池底部成型良好。此外，该方案消除了现有技术中电芯1底部与包装膜2之间的空隙，降低了电池的体积，提高电池的能量密度。该方案包装膜2的形状结构较为规则，在进行抽真空工艺时，不易损坏电池，可以提高电池的安全性能和使用寿命。
值得说明的是，在具体的实施例中，上述电池为软包电池。
可选的实施例中，第二段212的包装膜2之间可以相互固定，也可以不固定，例如，可以通过胶粘或者热压的方式使第二段212的包装膜2之间固定连接，也可以仅做压合处理，不将第二段212的包装膜2相互固定，只需使包装膜2折叠形成第二段212。
具体的实施例中，第二段212的包装膜2包含有机层、金属层，有机层位于包装膜2表面，两层包装膜2通过有机层粘合。
第二段212可以为压合第二段212，即该第二段212通过压合工艺制作，从而使两层包装膜2固定连接。当然，也可以在第二段212进行压合处理后，再进行热封，以提高第二段212的结构稳定性。或者采用其它的工艺来制作第二段212。
如图6和图7所示，优选的实施例中，第二段212粘贴于第一段211。该实施例中，第二段212可以翻折粘贴于第一段211的外侧，即粘贴于电池的底部。该实施例中，电池的结构更加规则，且使用该电池时，占用面积较小。且该实施例中，第二段212不易展开，可以进一步提高第二段212结构的稳定性。
第二段212粘贴于第一段211外侧的具体方式不限，例如，如图6所示，一个具体的实施例中，第二段212与第一段211之间设置有胶层3，第二段212与第一段通过胶层3固定。该实施例中，通过在第二段212与第一段之间设置胶层3，从而使第二段212粘贴于第一段211外侧。如图7所示，另一个具体的实施例中，电池还包括粘贴部4，粘贴部4设置在第一段211与第二段212外侧，使第二段212粘贴于第一段211。
具体的实施例中，两层包装膜2为一体式结构。如可通过如下方式实现，即第二段212的通过一张包装膜2折叠形成两层包装膜2，如图6所示，包装膜2为一整片膜材，在膜材中部形成翻折部，膜材翻折包覆电芯1，在翻折部形成的第二段212中，两层包装膜2展开后是连接关系。
请参考图8，一个具体的实施例中，电池还包括极耳7，极耳与第二段212相对设置在电池的两侧。如图7所示的实施例中，极耳7与第二段212相对设置在电池的第一方向5的两侧，具体的，第一方向5指的是极耳7从包装膜2中伸出的方向。当然该实施例仅作为一个具体的实施例，在实际应用中，也可以根据需求设计极耳7的位置。
请继续参考图8，更具体的实施例中，极耳7与第二段212位于电池的同侧。该实施例中，第二段212并未粘贴于第一段211的外侧，为展开状态。在如图8所示的实施例中，极耳7与第二段212位于电池沿电池第二方向6的同侧，第二方向6具体为与第一方向5垂直的方向，极耳7与第二段212位于电池的同侧，则使用该电池时，电芯1外部凸出的结构位于同一侧，则， 便于安装该电池以及在该电池附件安装其他配件。
请参考图8和图9，优选的实施例中，电芯1包括极片11、隔膜12和电解液(未示出)，隔膜12的部分位于第二段212的包装膜2之间。
该实施例中，第二段212还可以固定隔膜12，从而使电芯1较为稳固的固定在包装膜2内，减少电芯1与包装膜2之间的相对移动，进一步的提高了电池的使用寿命。
具体的实施例中，第二段的包装膜包含有机层，有机层与隔膜粘合。具体的，该实施例中的第二段以及隔膜通过热压的方式进行固定，可以进一步提高隔膜与第二段的固定强度。
具体的实施例中，第二段的厚度，满足：
h＝2d+n，
其中，h为第二段的厚度，d为包装膜的厚度，n为调整系数，-1mm≤n≤5mm。
值得说明的是，具体的实施例中，n可以为负值，因为制作第二段的方法不做具体限定，当采用热压的方式制作时，第二段的厚度可以小于两层包装膜的厚度。
第二段沿第一方向的宽度满足：
0.2mm≤W≤10mm，
其中，W为第二段沿第一方向的宽度，为如图8和图9中所示，宽度测量的起始点为第一段与第二段的交点，宽度测量的结束点为第二段沿第一方向离电芯的最远端。
第二段的尺寸满足上述条件，则可以使第一段与电芯端面贴合，从而消除现有技术中电芯底部与包装膜之间的空隙，降低电池的体积，提高电池的能量密度。还可以提高电池底部成型效果，以及电池的安全性能和使用寿命。具体的，如图7所示，该实施例中，第一方向5指的也是电池的长度方向。
具体的实施例中，包装膜包括叠置的多层结构，多层结构包括金属层和非金属层，金属层设置于非金属层之间。
该实施例中，金属层具有一定的硬度，可以保持包装膜的形状，有利于电池成型，且可以提高包装膜的强度，不易漏液；与电芯相邻的非金属层可以隔离电芯的分解液；裸露外侧的非金属层直接与外界接触，因此需要就有耐磨性，以提高电池的使用寿命。
具体的实施例中，包装膜包括叠置的三层结构，三层结构包括两层非金属层和一层设置于两层非金属层之间的金属层。该实施例中，包装膜的结构较为简单，且可以满足电池的功能需求。
具体的实施例中，金属层为铝层，与电芯相邻的非金属层为聚丙烯层，裸露外侧的非金属层为尼龙层。
一个具体的实施例中，金属层中质量含量最高的材料为铝或金属层中质量含量最高的材料为铁。即，可以是常说的铝箔或者铁箔，成本较低易于获得，且强度可以满足电池对包装膜的强度需求。
上述包装膜材料只是作为一个具体的实施例，其中任一层的材料可以根据需求用其它材料进行替换。
具体的实施例中，电池的具体类型不做限制，电池包括二次锂离子电池。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (12)

  1. 一种电池，其特征在于，包括：
    电芯；
    包装膜，封装所述电芯；
    所述包装膜包括翻折部，所述翻折部包括与所述电芯端面贴合的第一段和与所述第一段连接的第二段，所述第一段设置于所述第二段和所述电芯之间，所述第二段包括多层包装膜。
  2. 如权利要求1所述的电池，其特征在于，所述第二段包装膜包含有机层，所述有机层形成所述包装膜的表面，所述多层包装膜通过所述有机层粘合。
  3. 如权利要求1所述的电池，其特征在于，所述第二段粘贴于所述第一段。
  4. 如权利要求3所述的电池，其特征在于，所述第二段与所述第一段之间设置有胶层，所述第二段通过所述胶层粘贴于所述第一段。
  5. 如权利要求3所述的电池，其特征在于，所述电池还包括粘贴部，所述粘贴部设置在所述第一段与所述第二段外侧，所述第二段与所述第一段通过所述粘贴部固定。
  6. 如权利要求1所述的电池，其特征在于，所述多层包装膜为一体式结构。
  7. 如权利要求1所述的电池，其特征在于，所述电池还包括极耳，所述极耳与所述第二段设置在所述电池的相对两侧。
  8. 如权利要求7所述的电池，其特征在于，所述极耳与所述第二段位于所述电池的同侧。
  9. 如权利要求1所述的电池，其特征在于，所述电芯包括隔膜，所述隔膜位于所述第二段的多层包装膜之间。
  10. 如权利要求9所述的电池，其特征在于，所述第二段的包装膜包含有机层，所述有机层位于所述包装膜的表面，所述有机层与所述隔膜粘合。
  11. 如权利要求1所述的电池，其特征在于，所述第二段的厚度，满足：
    h＝2d+n；
    其中，h为所述第二段的厚度，d为所述包装膜的厚度，n为调整系数，-1mm≤n≤5mm。
  12. 如权利要求1所述的电池，其特征在于，所述第二段沿第一方向的宽度满足：
    0.2mm≤W≤10mm；
    其中，W为所述第二段沿第一方向的宽度。
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