WO2020151392A1 - 一种电池及其封装方法和终端 - Google Patents

一种电池及其封装方法和终端 Download PDF

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Publication number
WO2020151392A1
WO2020151392A1 PCT/CN2019/124980 CN2019124980W WO2020151392A1 WO 2020151392 A1 WO2020151392 A1 WO 2020151392A1 CN 2019124980 W CN2019124980 W CN 2019124980W WO 2020151392 A1 WO2020151392 A1 WO 2020151392A1
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WO
WIPO (PCT)
Prior art keywords
packaging film
bare cell
open space
groove
battery
Prior art date
Application number
PCT/CN2019/124980
Other languages
English (en)
French (fr)
Inventor
卢轮
洪达
梁家华
徐凡
谢封超
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP19911890.2A priority Critical patent/EP3907805A4/en
Priority to US17/424,653 priority patent/US20220123396A1/en
Publication of WO2020151392A1 publication Critical patent/WO2020151392A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • H01M10/05—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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • 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 embodiments of the present invention relate to the technical field of battery packaging, and in particular, to a battery and a packaging method and terminal thereof.
  • Lithium-ion batteries used in current electronic devices are usually rectangular.
  • the rectangular battery has a fixed shape and low flexibility, which will affect the design and arrangement of other components in the device to a certain extent. In some application scenarios, it may even cause space to be idle, resulting in a reduction in the utilization of the internal space of the device.
  • special-shaped batteries the shape of battery pole pieces or bare cells are irregular shapes
  • the complexity of the shape destined that the packaging process of the special-shaped battery will be more complicated than that of the traditional rectangular battery. Therefore, it is necessary to find a simpler and easier method to efficiently complete the packaging of the special-shaped battery.
  • Fig. 1 is a schematic diagram of packaging a special-shaped battery according to the existing packaging technology (the battery is in an unfolded state).
  • the packaging process usually involves the sealing, cutting, and folding process of the packaging film in the open space 10 (area without naked cells).
  • the cutting produces multiple extensions 101, 102, 103, and all three extensions
  • a hemming operation is required, and the extension side 101 and the extension side 102, and the extension side 102 and the extension side 103 intersect to form two intersection angles.
  • the edge hemming process at the corners of the intersection is more complicated. In addition, this corner is a stress concentration area. If the quality of the hemming cannot be guaranteed, serious battery safety problems may occur.
  • large-size chamfers 1012, 1023 need to be provided on the bare cells, so as to reserve sufficient space for corner hemming, so as to improve the operability of hemming and reduce safety risks.
  • Setting a large-size chamfer will cause a waste of available space, cause a loss of battery energy density, and increase the difficulty of cutting the pole piece on the bare cell.
  • an embodiment of the present invention provides a battery packaging method, which reduces the number of cutting and folding times by retaining the first sealing part generated by the packaging film in the open space at the edge of the bare cell during the packaging process, so as to solve the problem to a certain extent.
  • Existing special-shaped battery packaging technology requires multiple cutting and folding operations on the packaging film in the opening area, resulting in cumbersome packaging procedures and low packaging efficiency. Due to the limitations of the existing packaging technology, the opening of the bare cell is required. Large-size chamfers are set at the corners of the area, resulting in space waste, energy density loss, and difficulty in cutting pole pieces.
  • the first aspect of the embodiments of the present invention provides a battery packaging method, including the following steps:
  • a flat packaging film is provided, and a first groove for accommodating the bare cell is formed by stamping on the packaging film. At least one first open space is formed on the edge of the bare cell, and the first open space penetrates the entire In the thickness direction of the bare cell, there is no bare cell in the first open space, and the shape of the first groove is completely consistent with the shape of the bare cell; and the packaging film is placed along the first concave One side edge of the groove is folded to divide the packaging film into a first packaging film and a second packaging film.
  • the first groove is located on the first packaging film; the bare cell is placed on the In the first groove, the first packaging film and the second packaging film are attached to the remaining edges of the first groove and sealed to obtain a closed space to encapsulate the bare cell to obtain In a battery, the first packaging film and the second packaging film are tightly attached at the first open space, or the first sealing portion is formed by further hot pressing after being closely attached, and the first sealing portion does not cover
  • the first sealing portion and the packaging film on the side wall of the first open space enclose a second open space, and the first open space partially overlaps the second open space.
  • the specific operation of folding the packaging film along one side edge of the first groove to divide the packaging film into a first packaging film and a second packaging film is:
  • the packaging film is folded along the edge of one side of the first groove corresponding to the first open space, so that the packaging film is divided into a first packaging film and a second packaging film. In this way, it is possible to avoid cutting, heat-pressing and sealing and folding the packaging film on the side edge corresponding to the first open space.
  • the embodiment of the present invention also provides a battery packaging method, which includes the following steps:
  • a flat packaging film is provided, on which a first groove and a second groove for accommodating bare cells are stamped and formed on the packaging film, the first groove and the second groove are symmetrical and adjacently arranged At least one first open space is formed on the edge of the bare cell, the first open space runs through the thickness direction of the bare cell, and there is no bare cell in the first open space; and the packaging film Fold along one side edge of the first groove or the second groove to divide the packaging film into a first packaging film and a second packaging film.
  • the first recess is located in the first packaging film.
  • the second groove is located on the second packaging film; the bare cell is placed in the first groove, so that the first packaging film and the second packaging film are The remaining edges of the first groove are attached and sealed, and the first groove and the second groove are aligned to form a closed space that is completely consistent with the shape of the bare cell, so that the bare cell Encapsulation to obtain a battery, the first encapsulation film and the second encapsulation film are tightly attached at the first open space, or the first sealing portion is formed by further hot pressing after being closely attached, and the first sealing Part does not cover the bare cell, the first sealing part and the packaging film on the side wall of the first open space enclose a second open space, and the first open space partially overlaps the second open space .
  • the specific operation of folding the packaging film along one side edge of the first groove to divide the packaging film into a first packaging film and a second packaging film is:
  • the packaging film is folded along a side edge of the first groove corresponding to the first open space, so that the packaging film is divided into a first packaging film and a second packaging film.
  • the battery packaging method provided in the first aspect of the embodiment of the present invention has simple procedures and high packaging efficiency, and is suitable for packaging various batteries with irregular shapes.
  • an embodiment of the present invention provides a battery including a bare cell and a packaging film, the edge of the bare cell includes at least one first open space, and the first open space penetrates the thickness of the bare cell Direction, there is no bare cell in the first open space, the packaging film encloses a closed space for accommodating the bare cell, the packaging film forms a first sealing portion at the first open space, the The first sealing portion does not cover the bare cell, the first sealing portion and the packaging film on the side wall of the first open space enclose a second open space, and the first open space and the second open space The space partially overlaps.
  • the distance from the first sealing portion to the surface of the bare cell is less than or equal to the thickness of the bare cell.
  • the first sealing part is in the shape of a flat plate, and the first sealing part is parallel to the surface of the bare cell, and when projected in the thickness direction of the bare cell, the first sealing part The projection partially or completely overlaps the projection of the first open space.
  • the first sealing portion is formed with a notch, and the notch is away from the side wall of the first open space.
  • the setting of the gap can leave more space for accommodating electronic components.
  • the first sealing portion in a direction parallel to the surface of the bare cell, covers part or all of the first open space.
  • the size of the first sealing portion in a direction parallel to the surface of the bare cell can be set according to actual needs.
  • the packaging film includes a first packaging film and a second packaging film integrally folded and molded with the first packaging film.
  • one side of the first packaging film and the second packaging film integrally folded and molded is a continuous structure, and the two layers of the first packaging film and the second packaging film are not formed by bonding The clear dividing line.
  • the side where the second packaging film and the first packaging film are integrally folded and formed corresponds to the side edge of the bare cell where the first open space is provided. In this way, it is possible to avoid cutting, heat-pressing and sealing and folding the packaging film on the side edge corresponding to the first open space.
  • the first open space is formed with a chamfer, and the length of the chamfered side of the chamfer is less than or equal to 25 mm.
  • the relatively small length of the chamfered edge is beneficial to save space and also facilitates the cutting of pole pieces.
  • the length of the chamfered side of the chamfer is less than or equal to 5 mm.
  • the first open space is similar to a rectangle, and the bare cell is a concave-shaped bare cell.
  • the first packaging film encloses a first groove for accommodating the bare cell, and the shape of the first groove completely matches the shape of the bare cell.
  • the second packaging film is a flat film layer.
  • the first packaging film encloses a first groove
  • the second packaging film encloses a second groove
  • the first groove and the second groove are joined to form the Enclosed space.
  • the first sealing portion is formed by closely adhering the first packaging film and the second packaging film.
  • the first sealing portion is formed by closely adhering the first packaging film and the second packaging film, and further by hot pressing.
  • the bare cell and the at least one first open space form a regular three-dimensional shape.
  • the bare cell and the at least one first open space form a rectangular parallelepiped or a cylinder.
  • the inside of the bare cell further includes one or more third open spaces, the third open space runs through the thickness direction of the bare cell, and the third open space has no bare cell
  • the packaging film forms a second sealing portion at the third open space, the second sealing portion does not cover the bare cell, and the second sealing portion covers part or all of the third open space,
  • the second sealing portion and the packaging film on the side wall of the third open space enclose a fourth open space.
  • the fourth open space can also be used to accommodate electronic components.
  • the packaging film includes a first packaging film and a second packaging film, and the second sealing portion is formed by closely adhering the first packaging film and the second packaging film.
  • the packaging film includes a first packaging film and a second packaging film
  • the second sealing portion is formed by closely adhering the first packaging film and the second packaging film, and further being formed by hot pressing.
  • the bare cell is a laminated cell or a wound cell.
  • the bare cell further includes a pair of tabs arranged on the same side of the bare cell, and the tabs are partially exposed from the packaging film.
  • the tab is located at an edge of the first open space of the bare cell.
  • the tab is located at the edge of the bare cell on a side where the first open space is not provided.
  • the first sealing part generated by the packaging film in the edge open space during the battery packaging process is retained, thereby significantly reducing the packaging film during the entire packaging process.
  • the number of cutting and folding operations simplifies the packaging process and improves packaging efficiency; and there is no need to set large-size chamfers at the corners of the first open space, which optimizes the cell structure design, avoids energy density loss, and also Reduce the difficulty of pole piece cutting.
  • a third aspect of the embodiments of the present invention provides a terminal, including a housing, and a display module, an electronic component module, and a battery housed in the housing, where the battery is the display module and the electronic component The device module is powered, and the battery is the battery provided in the second aspect of the present invention.
  • the second open space is provided with electronic components.
  • the terminal provided by the embodiment of the present invention uses the battery provided in the second aspect of the embodiment of the present invention, and the internal space of the terminal device occupied by the battery is small.
  • the second open space can be used to place other electronic components, thereby further improving the internal space of the device. Space utilization.
  • FIG. 1 is a schematic diagram of packaging a special-shaped battery according to the existing packaging technology
  • FIG. 2 is a schematic diagram of the structure of a battery in an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of the structure of a bare cell in the battery shown in FIG. 2;
  • FIG. 4 is a schematic diagram of the structure of a battery in another embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the design of the first open space in another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of the design of the first open space in another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of the design of the first open space in another embodiment of the present invention.
  • FIG. 8 is a schematic diagram of the design of the first open space and the third open space in another embodiment of the present invention.
  • 9A-9F are schematic diagrams of the packaging process of the battery in an embodiment of the present invention.
  • the existing special-shaped battery packaging process usually involves multiple sealing, cutting, and folding operations of the packaging film in the open space of the special-shaped bare cell edge, and in order to reserve sufficient space for corner folding of the open space at the edge.
  • it is necessary to set a large-size chamfer at the corner of the bare chip.
  • setting a large-size chamfer will waste the available space of the bare chip, resulting in a loss of battery energy density, and also It will increase the difficulty of cutting the pole piece.
  • the embodiments of the present invention provide a battery packaging method and a battery, which reduce the number of cutting and folding operations of the packaging film by retaining the first sealing portion generated by the packaging film in the edge open space during the packaging process.
  • the bare cell has an irregular three-dimensional shape, which can be any irregular three-dimensional shape, including non-cubes, non-cylinders and the like.
  • the edge of the bare cell has an edge depression, wherein the first open space is formed at the edge of the bare cell and penetrates the edge depression space in the thickness direction of the bare cell, and there is no bare cell in the first open space.
  • the bare cell includes a positive electrode sheet, a negative electrode sheet, and an isolation film for separating the positive electrode sheet and the negative electrode sheet.
  • the bare cell is encapsulated with an encapsulation film and injected with electrolyte to obtain a battery.
  • the first open space is defined by the side wall of the edge recess of the bare cell, the extension surface of the opposite two surfaces of the bare cell, and the side extension surface of the bare cell on the side where the edge recess is located.
  • the second open space consists of the packaging film on the sidewall of the recessed edge of the bare cell, the extended surface of the packaging film on the opposite surfaces of the bare cell, the first sealing part, and the side of the bare cell on the side where the edge recess is located.
  • the extension surface of the packaging film is defined.
  • an embodiment of the present invention provides a battery 100, which includes a bare cell 11 and an encapsulation film 12.
  • the edge of the bare cell 11 includes at least one first open space 120.
  • the first open space 120 runs through the thickness direction of the bare cell. There is no bare cell in the first open space 120.
  • the packaging film 12 encloses a closed space for accommodating the bare cell 11.
  • the core 11 is accommodated in the closed space, the packaging film 12 forms a first sealing portion 121 at the first open space 120, and the first sealing portion 121 is on the side wall of the first open space 120
  • the encapsulation film encloses a second open space 140, and the first open space 120 and the second open space 140 partially overlap.
  • the distance from the first sealing portion 121 to the surface of the bare cell 11 is less than or equal to the thickness of the bare cell 11.
  • the first sealing portion 121 may be disposed close to one side surface of the bare cell 11, or may be disposed on the side wall surrounding the first open space 120 along the thickness direction of the bare cell 11 The central position.
  • the first sealing portion 121 is in the shape of a flat plate.
  • the projection of the first sealing portion 121 and the projection of the first open space 120 partially or completely overlap.
  • the first sealing portion 121 covers part or all of the first open space 120 in a direction parallel to the surface of the bare cell 11.
  • the first sealing portion 121 covers a part of the first open space 120
  • the first sealing portion 121 is formed with a gap, and the gap is far away from the edge of the bare cell 11, that is, away from the first open space 120
  • the sidewall The notch is located at the edge of the first sealing portion 121, and the shape and number of the notch are not limited, and the placement of the notch can free up more space for accommodating electronic components.
  • the first sealing portion 121 is connected to the packaging film on the side wall of the first open space 120.
  • the packaging film 11 includes a first packaging film and a second packaging film, and the first packaging film and the second packaging film together form the closed space.
  • the second packaging film and the first packaging film are integrally folded and formed.
  • the side where the second packaging film and the first packaging film are integrally folded and formed corresponds to the side edge of the bare cell 11 where the first open space 120 is provided. That is, when the second packaging film and the first packaging film are integrally folded and formed, they are folded along the edge of the first open space 120 provided with the bare cell 11.
  • One side of the first packaging film and the second packaging film integrally folded and molded is a continuous structure, and there is no obvious dividing line formed by the bonding of the two layers of the first packaging film and the second packaging film.
  • the first packaging film and the second packaging film may be commonly used aluminum-plastic composite films.
  • the aluminum-plastic composite film may include a polypropylene layer, an aluminum layer, and a nylon layer laminated in sequence, wherein the nylon layer is located at the outermost layer, and the thickness of the single-layer aluminum-plastic composite film is 50 ⁇ m-100 ⁇ m.
  • the first packaging film and the second packaging film respectively cover the first surface and the second surface on opposite sides of the bare cell.
  • the first packaging film covers the first surface of the bare cell 11
  • the second packaging film covers the second surface of the bare cell 11
  • the first packaging film and the second packaging film are hermetically bonded at the outer peripheral edge of the bare cell 11 to realize the packaging of the bare cell.
  • the first sealing portion 121 is formed by closely adhering the first packaging film and the second packaging film. That is, the thickness of the first sealing portion 121 is equal to the sum of the thicknesses of the first packaging film and the second packaging film.
  • the first sealing portion 121 is formed by closely adhering the first packaging film and the second packaging film, and is further formed by hot pressing.
  • the hot pressing may be hot pressing in a local area or It is hot pressing in all areas. After hot pressing, the thickness of the first sealing portion 121 is less than the sum of the thicknesses of the first packaging film and the second packaging film. After hot pressing, a better sealing structure can be formed, and the thickness of the packaging film can be further reduced, and the available space can be increased.
  • the thickness of the first sealing portion 121 is 20 ⁇ m-300 ⁇ m, and further, the thickness of the first sealing portion 121 is 50 ⁇ m-200 ⁇ m.
  • the first packaging film encloses a first groove for accommodating the bare cell, and the shape of the first groove is completely consistent with that of the bare cell.
  • the second packaging film is a flat film layer.
  • the first packaging film encloses a first groove
  • the second packaging film encloses a second groove
  • the first groove is aligned with the second groove
  • the closed space is formed.
  • first open spaces 120 when there are multiple first open spaces 120, there are also multiple first sealing portions 121 correspondingly.
  • the side wall of the first open space 120 refers to the side of the bare cell surrounding the first open space 120.
  • the shape of the enclosed space is completely consistent with the shape of the bare cell 11.
  • the bare cell 11 and the at least one first open space 120 may form a regular three-dimensional shape.
  • the specific shape of the regular three-dimensional shape is not limited.
  • the The bare cell 11 and the at least one first open space 120 form a rectangular parallelepiped.
  • the bare cell 11 and the at least one first open space 120 may also form a cylinder or other regular three-dimensional shapes.
  • first open space 120 at the outer peripheral edge of the bare cell 11 may be provided, or multiple ones may be provided.
  • the plurality of first open spaces 120 may be arranged on the same side of the bare cell 11 or may be arranged on different sides of the bare cell 11.
  • the specific shape of the first open space 120 is not limited, and may be a regular or irregular shape, such as a rectangle, a rectangle-like shape, a trapezoid, a circle, a semicircle, and the like.
  • the plurality of first open spaces 120 may have the same shape or different shapes. The size and position of the first open space 120 can be flexibly set according to actual needs.
  • the first open space 120 is approximately rectangular
  • the bare cell 11 is a concave-shaped bare cell
  • the packaging film 12 is in the first open space 120.
  • a first sealing portion 121 is formed at the position, the projection of the first sealing portion 121 on the plane where the surface of the bare cell 11 is similar to rectangle, and the first sealing portion 121 on the plane where the surface of the bare cell 11 is located The projection of is completely coincident with the projection of the first open space on the plane where the surface of the bare cell 11 is located.
  • the length L 1 of the first open space 120 is less than the total length L 3 of the bare cell 11, the width L 2 is less than the total width L 4 of the bare cell 11, and the height is the thickness H 0 of the bare cell.
  • the distance L 5 from the left edge of an open space 120 to the left edge of the bare cell 11 is less than (L 4 -L 2 ).
  • the preferred length interval of the first open space 120 is L 1 ⁇ 2/3L 3
  • the preferred width interval is L 2 ⁇ 2/3L 4 .
  • the bare cell has a trapezoidal first open space, the bare cell and the first open space form a rectangular parallelepiped, and the packaging film is placed on the first open space.
  • a trapezoidal first sealing part 121 is formed in the open space.
  • the bare cell has two rectangular-like first open spaces 120 respectively arranged on opposite sides of the bare cell. The space forms a cuboid.
  • the bare cell has a rectangular-like first open space 120, and the bare cell and the first open space form a rectangular parallelepiped.
  • the bare cell has a rectangular-like first open space 120, and the bare cell and the first open space form a cylinder.
  • a chamfer is formed in the first open space 120, the shape of the chamfer is the same as that of the bare cell, and the length of the chamfered side 111 of the chamfer is less than Or equal to 25mm. Further, the length of the chamfered side 111 of the chamfer is less than or equal to 5 mm.
  • the side wall enclosing the first open space 120 includes two intersecting sides 111a, 111b
  • the two intersecting sides 111a, 111b form a chamfer
  • the chamfered side One end of 111 intersects the side 111a, and the other end intersects the side 111b.
  • the chamfer is not limited, it can be round chamfer (the chamfered side is a circular arc side), and a bevel chamfer (the chamfered side is a straight side).
  • the chamfered side 111 may also be Consists of multiple edges.
  • the length of the chamfered side 111 is the length of the arc side
  • the length of the chamfered side 111 is the length of the straight side.
  • one or more third open spaces 130 are formed inside the bare cell 11, and the third open spaces 130 pass through the thickness direction of the bare cell 11,
  • the third open space 130 has no bare cells, and the packaging film 12 forms a second sealing portion at the third open space 130.
  • the second sealing portion does not cover the bare cells and is parallel to all the cells.
  • the second sealing portion covers part or all of the third open space 130, and the second sealing portion and the packaging film on the sidewalls of the third open space 130 surround Into the fourth open space.
  • the third open space 130 may be provided with only one or more than one.
  • the specific shape of the third open space 130 is not limited, and may be a regular or irregular shape, such as a rectangle, a trapezoid, a circle, a semicircle, and the like.
  • the plurality of third open spaces 130 may have the same shape or different shapes.
  • the size of the third open space 130 can be set according to actual needs.
  • the packaging film of the second sealing portion may be formed by closely adhering the first packaging film and the second packaging film, or may be formed by the first packaging film and the second packaging film.
  • the film is tightly attached and formed by further hot pressing.
  • the hot pressing can be a part or all of the area.
  • the second sealing part is in the shape of a flat plate, and when the second sealing part is parallel to the surface of the bare cell 11 and is projected onto the plane where the surface of the bare cell 11 is located, The projection of the second sealing portion and the projection of the third open space 130 completely overlap.
  • the packaging film 12 further includes a flange 122 disposed on the edge of the bare cell 11, and the flange 122 is located on the edge of the bare cell 11 where the first open space 120 is not provided.
  • the folding edge 122 is formed by bonding the first packaging film and the second packaging film, and then folding them along the edge of the bare cell 11 after being hot pressed. Since the first packaging film and the first packaging film are integrally folded and formed, the folded edge in FIG. 2 is close to the end of the packaging film on one side of the integrally folded and formed side, without the first packaging film and the second packaging film.
  • the obvious dividing line formed by the two-layer film is formed by bonding the first packaging film and the second packaging film, and then folding them along the edge of the bare cell 11 after being hot pressed. Since the first packaging film and the first packaging film are integrally folded and formed, the folded edge in FIG. 2 is close to the end of the packaging film on one side of the integrally folded and formed side, without the first packaging film and the second packaging film. The
  • the bare cell 11 may be a laminated cell or a wound cell. Specifically, it may be formed of a positive electrode sheet, a negative electrode sheet, and a separator in a laminated manner or by winding. Way to form.
  • the first open space 120 and the third open space 130 do not contain a positive electrode sheet, a negative electrode sheet and a separator.
  • the bare cell 11 further includes a pair of tabs 112, and the tabs 112 are partially exposed outside the packaging film 12.
  • the tab 112 includes a positive tab and a negative tab.
  • the positive tab and the negative tab can be arranged on the same side of the bare cell 11 or on different sides.
  • the tab 112 may be arranged on a side edge of the bare cell 11 where the first open space is provided, or may be set on a side edge of the bare cell 11 where the first open space is not provided.
  • the first sealing portion generated by the packaging film in the open space at the edge of the bare cell during the battery packaging process is retained, thereby significantly reducing the packaging film during the entire packaging process.
  • the number of cutting and edge folding operations simplifies the packaging process and improves packaging efficiency; and the corner positions of the first open space of the bare cell do not need to be large-sized chamfering, which optimizes the structure design of the bare cell and avoids This reduces the energy density loss and also reduces the difficulty of pole piece cutting.
  • the embodiment of the present invention also provides the above-mentioned battery packaging method, which includes the following steps:
  • S110 Provide a flat packaging film, stamping and forming a first groove for accommodating a bare cell on the packaging film, at least one first open space is formed on the edge of the bare cell, and the first open space Through the thickness direction of the bare cell, there is no bare cell in the first open space, and the shape of the first groove is completely consistent with the shape of the bare cell;
  • the specific operation of folding the packaging film along one side edge of the first groove to divide the packaging film into a first packaging film and a second packaging film is:
  • the packaging film is folded along a side edge of the first groove corresponding to the first open space, so that the packaging film is divided into a first packaging film and a second packaging film.
  • the embodiment of the present invention also provides the above-mentioned battery packaging method, which includes the following steps:
  • S210 Provide a flat packaging film, stamping and forming a first groove and a second groove for accommodating the bare cell on the packaging film, the first groove and the second groove are symmetrical and adjacent to each other Connected, at least one first open space is formed on the edge of the bare cell, the first open space runs through the thickness direction of the bare cell, and there is no bare cell in the first open space;
  • the specific operation of folding the packaging film along one side edge of the first groove to divide the packaging film into a first packaging film and a second packaging film is:
  • the packaging film is folded along a side edge of the first groove corresponding to the first open space, so that the packaging film is divided into a first packaging film and a second packaging film.
  • the battery packaging method includes the following steps:
  • S101 Provide a flat packaging film 12', and punch and form a first groove 124 for accommodating the bare cell 11 on the flat packaging film 12'.
  • the shape of the first groove 124 is the same as that of the bare cell 11 Are exactly the same shape;
  • FIG. 9A is a schematic diagram of the structure of the packaging film 12' after punching in an embodiment of the present invention. As shown in FIG. 9A, in this embodiment, only the first groove 124 is punched out on the packaging film 12'. After the pits are punched, the area outside the first groove 124 of the packaging film 12' remains flat.
  • the packaging film 12' may be a commonly used aluminum-plastic composite film. Referring to FIG. 9D, the edge of the bare cell 11 is formed with at least one first open space 120 without a bare cell, and the bare cell 11 and the at least one first open space 120 form a rectangular parallelepiped.
  • the packaging film 12' is folded along one side edge of the first groove 124 to bend the packaging film 12' into a U-like shape, as shown in FIG. 9B and FIG. 9C Show.
  • the folded packaging film 12' can be divided into upper and lower parts. With the folding line as the boundary, the part of the packaging film containing the first groove 124 is defined as the first packaging film 13, and the flat part without the groove is packaged The film is defined as the second packaging film 14;
  • the folding operation may be to fold along the edge 113 of the side corresponding to the first open space 120, so that the packaging film 12' is divided into first The packaging film 13 and the second packaging film 14. In this way, it is possible to avoid cutting, heat-pressing and sealing and folding the packaging film on the side edge 113 corresponding to the first open space 120.
  • the packaging film 12' is bent, as shown in FIG. 9D, the bare cell 11 is placed in the first groove 124, and then the first packaging film and the second packaging film are continued along the folding line Fold until the first packaging film 13 and the second packaging film 14 are completely attached and closed.
  • Figure 9E after the first encapsulation film 13 and the second encapsulation film 14 are completely closed, the flat areas of the first encapsulation film 13 and the second encapsulation film 14 are attached to each other to form an extended edge; the main body of the bare cell 11 is Wrapped inside the first groove 124 of the packaging film; part of the tab sealant and the tab 112 are exposed outside the packaging film.
  • the first encapsulation film 13 and the second encapsulation film 14 are bonded to form a left edge extension 123, a right edge extension 124, an upper edge extension 125 and a first sealing portion 121, each of which extends and the first sealing portion is formed by the upper ,
  • the lower two layers of encapsulation film are laminated to each other to form.
  • the left edge extension edge 123, the right edge extension edge 124, and the upper edge extension edge 125 are conventional extension edges generated by packaging.
  • a first sealing portion 121 is formed at a corresponding position in the first open space 120. Then, the left edge extension 123 and the upper edge extension 125 of the packaging film need to be sealed.
  • the packaging film uses an aluminum-plastic composite film
  • it is usually sealed by hot pressing. Specifically, the inner polypropylene layer of the upper and lower aluminum-plastic composite film is melted by heating, and then pressure is applied to fuse the two opposite polypropylene layers. After cooling to room temperature, the polypropylene layer solidifies again. The two aluminum-plastic composite films at the extended edges are sealed together. After the left edge extension 123 and the upper edge extension 125 are sealed, the battery needs to go through the conventional baking, liquid injection, formation, and degassing processes, and then the right edge extension 124 is sealed by the same sealing method.
  • the first sealing part 121 since it is in a sealing state, and the upper and lower packaging films in this area can be tightly adhered by vacuum pumping during the battery degassing process, the first sealing part 121 does not need to be sealed again; In order to further ensure the sealing effect, it is also possible to choose to perform a partial or complete sealing operation on the first sealing portion 121.
  • the thickness of the first sealing portion 121 formed after sealing is smaller than the sum of the thicknesses of the first packaging film and the second packaging film.
  • the left edge extension edge 123 and the right edge extension edge 124 are cut to an appropriate width value, which is less than or equal to the total thickness of the battery.
  • the left edge extension edge 123 is folded clockwise along its right edge line, and the right edge extension edge 124 is folded counterclockwise along its left edge line to make the left and right edge extension edges and the two sides of the first groove 124 of the packaging film
  • the fold 122 is formed by bonding together to complete the packaging of the entire battery, and the battery as shown in FIG. 9F is obtained.
  • the entire packaging process only performs hemming operation on the left edge extension 123 and the right edge extension 124, and no edge folding operation is involved at each corner of the bare cell, so there is no need to set large-size chamfers.
  • the small thickness of the first sealing portion 121 makes the battery in the corresponding position of the first open space 120 formed a second open space 140, the second open space 140 can be used to place other electronic components.
  • a part of the first sealing portion 121 may be cut off to form Notch, the cut first sealing portion 121 partially covers the first open space 120 in a direction parallel to the surface of the bare cell 11, in order to ensure the sealing effect, the cutting line and the edge of the bare cell 11 are reserved during cutting A certain distance.
  • the packaging method provided above in the embodiment of the present invention has simple procedures and high packaging efficiency, and is suitable for packaging various special-shaped batteries.
  • An embodiment of the present invention further provides a terminal, including a housing, and a display module, an electronic component module, and a battery housed in the housing, and the battery is the display module and the electronic component module.
  • the battery is powered by the group, and the battery is the battery provided above in the embodiment of the present invention.
  • the second open space is provided with electronic components.
  • a second open space is formed at the corresponding position of the first open space of the bare cell, and the second open space can be used for placement Other electronic components, thereby further improving the space utilization rate inside the equipment.

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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)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

一种电池的封装方法和电池，所述电池（100）包括裸电芯（11）和封装膜（12），裸电芯（11）的边缘包括至少一个第一开放空间（120），第一开放空间（120）贯穿裸电芯（11）的厚度方向，第一开放空间（120）处无裸电芯（11），封装膜（12）围成容纳裸电芯（11）的封闭空间，封装膜（12）在第一开放空间（120）处形成第一封口部（121），第一封口部（121）不覆盖裸电芯（11），第一封口部（121）与第一开放空间（120）侧壁上的封装膜（12）围成第二开放空间（140），第一开放空间（120）与第二开放空间（140）部分重合。该电池在维持电池形状灵活性的基础上，减少了封装过程中封装膜的裁切和折边操作次数，简化了封装工艺；且裸电芯边缘开放空间的角位处无需设置大尺寸倒角，避免了能量密度损失，同时降低了极片裁切难度。还提供了包含该电池的终端。

Description

一种电池及其封装方法和终端
本申请要求在2019年1月22日提交中国国家知识产权局、申请号为201910059966.5、发明名称为“一种电池及其封装方法和终端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明实施例涉及电池封装技术领域，特别是涉及一种电池及其封装方法和终端。
背景技术
当前电子设备中使用的锂离子电池通常为矩形。矩形电池形状固定、灵活性较低，会在一定程度上影响到设备内部其他元器件的设计和排布，在某些应用场景下甚至会造成空间闲置，导致设备内部空间利用率降低。相比之下，异形电池(电池的极片或者裸电芯的形状为不规则形状)的形状灵活性高、一致性好、可设计性强，在提高空间利用率和优化结构设计方面具有独特优势。然而，形状的复杂性注定了异形电池的封装工序会比传统矩形电池更加复杂，因此需要找到更为简单易行的方法来高效地完成异形电池的封装。
图1为按照现有封装技术封装异形电池的示意图(电池处于未折边状态)。封装过程中，通常涉及边缘开放空间10(无裸电芯的区域)的封装膜的密封、裁切、折边工艺，裁切产生101、102、103多道延伸边，这三道延伸边都需进行折边操作，且延伸边101和延伸边102以及延伸边102和延伸边103相交形成两个交角，交角的角位处延伸边的折边工艺更加复杂。此外，该角位处是应力集中区域，如果折边质量无法保证，可能会产生严重的电池安全问题。按照现有封装技术方案，需要在裸电芯设置大尺寸倒角1012、1023，从而为角位折边预留出充足的空间，以此来提高折边的可操作性并降低安全风险，然而设置大尺寸倒角会造成可利用空间的浪费，导致电池能量密度损失，同时还会提高裸电芯上的极片的裁切难度。
发明内容
鉴于此，本发明实施例提供一种电池的封装方法，通过保留封装过程中封装膜在裸电芯边缘开放空间产生的第一封口部，减少裁切、折边次数，以在一定程度上解决现有异形电池封装技术需对开口区域的封装膜进行多次裁切和折边操作，导致封装工序繁琐、封装效率低的问题，以及由于现有封装技术的限制，需在裸电芯的开口区域的角位处设置大尺寸倒角，导致空间浪费、能量密度损失、极片裁切难度高的问题。
具体地，本发明实施例第一方面提供了一种电池的封装方法，包括如下步骤：
提供一平整封装膜，在所述封装膜上冲压形成用于容纳裸电芯的第一凹槽，所述裸电芯的边缘形成有至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯，所述第一凹槽的形状与所述裸电芯的形状完全吻合；将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜，所述第一凹槽位于所述第一封装膜上；将所述裸电芯置于所述第一凹槽中，使所述第一封装膜和所述第二封装膜在所述第一凹槽的其余边缘贴合，并密封得到一封闭空间，以将所述裸电芯封装，得到电池，所述第一封装膜和所述第二封装膜在所述第一开放空间处紧密贴合，或紧密贴合后经进一步热压形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口 部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
本发明实施方式中，所述将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜的具体操作为：将所述封装膜沿所述第一凹槽的与所述第一开放空间对应的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜。这样可免去对第一开放空间所对应的一侧边缘的封装膜进行裁切、热压密封和折边操作。
本发明实施例还提供了一种电池的封装方法，包括如下步骤：
提供一平整封装膜，在所述封装膜上冲压形成用于容纳裸电芯的第一凹槽和第二凹槽，所述第一凹槽与所述第二凹槽对称且相邻接设置，所述裸电芯的边缘形成有至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯；将所述封装膜沿所述第一凹槽或所述第二凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜，所述第一凹槽位于所述第一封装膜上，所述第二凹槽位于所述第二封装膜上；将所述裸电芯置于所述第一凹槽中，使所述第一封装膜和所述第二封装膜在所述第一凹槽的其余边缘贴合并密封，所述第一凹槽与所述第二凹槽对合，形成与所述裸电芯形状完全吻合的一封闭空间，以将所述裸电芯封装，得到电池，所述第一封装膜和所述第二封装膜在所述第一开放空间处紧密贴合，或紧密贴合后经进一步热压形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
本发明实施方式中，所述将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜的具体操作为：将所述封装膜沿所述第一凹槽的与所述第一开放空间对应的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜。
本发明实施例第一方面提供的电池的封装方法，工序简单，封装效率高，适合各种具有非规则形状的电池的封装。
第二方面，本发明实施例提供一种电池，包括裸电芯和封装膜，所述裸电芯的边缘包括至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯，所述封装膜围成容纳所述裸电芯的封闭空间，所述封装膜在所述第一开放空间处形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
本发明实施方式中，所述第一封口部到所述裸电芯表面的距离小于或者等于所述裸电芯的厚度。
本发明实施方式中，所述第一封口部为平板状，所述第一封口部平行于所述裸电芯表面，向所述裸电芯的厚度方向投影时，所述第一封口部的投影与所述第一开放空间的投影部分或完全重合。
本发明实施方式中，所述第一封口部形成有缺口，所述缺口远离所述第一开放空间的侧壁。缺口的设置可以留出更多空间用于容置电子元器件。
本发明实施方式中，在平行于所述裸电芯表面的方向上，所述第一封口部覆盖部分或全部所述第一开放空间。第一封口部可根据实际需要设定其在平行于所述裸电芯表面的方向上的尺寸。
本发明实施方式中，所述封装膜包括第一封装膜和与所述第一封装膜一体折叠成型的第二封装膜。
本发明实施方式中，所述第一封装膜和所述第二封装膜一体折叠成型的一侧是连续的结 构，无所述第一封装膜和所述第二封装膜两层膜贴合形成的明显分界线。
本发明实施方式中，所述第二封装膜与所述第一封装膜一体折叠成型的一侧，与所述裸电芯设置所述第一开放空间的一侧边缘对应。这样可免去对第一开放空间所对应的一侧边缘的封装膜进行裁切、热压密封和折边操作。
本发明实施方式中，所述第一开放空间形成有倒角，所述倒角的倒角边的长度小于或等于25mm。相对较小的倒角边长度有利于节省空间，也有利于极片裁切。
本发明实施方式中，所述倒角的倒角边长度小于或等于5mm。
本发明实施方式中，所述第一开放空间为类矩形，所述裸电芯为凹字形裸电芯。
本发明实施方式中，所述第一封装膜围成用于容纳所述裸电芯的第一凹槽，所述第一凹槽的形状与所述裸电芯的形状完全吻合，所述第二封装膜为一平整膜层。
本发明实施方式中，所述第一封装膜围成第一凹槽，所述第二封装膜围成第二凹槽，所述第一凹槽与所述第二凹槽对合形成所述封闭空间。
本发明实施方式中，所述第一封口部由所述第一封装膜与所述第二封装膜紧密贴合形成。
本发明实施方式中，所述第一封口部由所述第一封装膜与所述第二封装膜紧密贴合并进一步经热压形成。
本发明实施方式中，所述裸电芯与所述至少一个第一开放空间构成一规则立体形状。
本发明实施方式中，所述裸电芯与所述至少一个第一开放空间构成长方体或圆柱体。
本发明实施方式中，所述裸电芯的内部还包括一个或多个第三开放空间，所述第三开放空间贯穿所述裸电芯的厚度方向，所述第三开放空间无裸电芯，所述封装膜在所述第三开放空间处形成第二封口部，所述第二封口部不覆盖所述裸电芯，所述第二封口部覆盖部分或全部所述第三开放空间，所述第二封口部与所述第三开放空间的侧壁上的封装膜围成第四开放空间。所述第四开放空间也可用于容置电子元器件。
本发明实施方式中，所述封装膜包括第一封装膜和第二封装膜，所述第二封口部由所述第一封装膜和所述第二封装膜紧密贴合形成。
本发明实施方式中，所述封装膜包括第一封装膜和第二封装膜，所述第二封口部由所述第一封装膜和所述第二封装膜紧密贴合并进一步经热压形成。
本发明实施方式中，所述裸电芯为叠片式电芯或卷绕式电芯。
本发明实施方式中，所述裸电芯还包括设置在所述裸电芯同一侧的一对极耳，所述极耳部分露出于所述封装膜。
本发明实施方式中，所述极耳位于所述裸电芯设置所述第一开放空间的一侧边缘。
本发明实施方式中，所述极耳位于所述裸电芯未设置所述第一开放空间的一侧边缘。
本发明实施例第二方面提供的电池，在维持电池形状灵活性的基础上，通过保留电池封装过程中封装膜在边缘开放空间产生的第一封口部，从而显著减少了整个封装过程中封装膜的裁切和折边操作次数，简化了封装工艺，提高了封装效率；且第一开放空间的角位处无需设置大尺寸倒角，优化了电芯结构设计，避免了能量密度损失，同时也降低了极片裁切难度。
本发明实施例第三方面提供一种终端，包括壳体、以及收容于所述壳体内的显示模组、电子元器件模组和电池，所述电池为所述显示模组和所述电子元器件模组供电，所述电池为本发明第二方面提供的所述电池。本发明实施方式中，所述第二开放空间设置有电子元器件。本发明实施例提供的终端，由于使用本发明实施例第二方面提供的电池，电池所占的终端设备内部空间很小，第二开放空间可用于放置其他电子元器件，从而进一步提高设备内部的空间利用率。
附图说明
图1为按照现有封装技术封装异形电池的示意图；
图2为本发明一实施方式中电池的结构示意图；
图3为图2所示的电池中裸电芯的结构示意图；
图4为本发明另一实施方式中电池的结构示意图；
图5为本发明另一实施方式中第一开放空间的设计示意图；
图6为本发明另一实施方式中第一开放空间的设计示意图；
图7为本发明另一实施方式中第一开放空间的设计示意图；
图8为本发明另一实施方式中第一开放空间和第三开放空间的设计示意图；
图9A-图9F为本发明一实施方式中电池的封装过程示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例进行说明。
在现有异形电池封装过程中，通常涉及异形裸电芯边缘开放空间封装膜的多次密封、裁切、折边操作，而且为了给边缘开放空间角位折边预留出充足的空间，以提高折边的可操作性并降低安全风险，需要在裸芯片的角位设置大尺寸倒角，然而设置大尺寸倒角会造成裸芯片的可利用空间的浪费，导致电池能量密度损失，同时还会提高极片的裁切难度。为了解决这一问题，本发明实施例提供一种电池的封装方法和电池，通过保留封装过程中封装膜在边缘开放空间产生的第一封口部，减少了封装膜裁切、折边操作次数。
本发明中，裸电芯具有非规则立体形状，可以是任意非规则立体形状，包括非长方体、非圆柱体等。裸电芯边缘具有边缘凹陷，其中，第一开放空间是在裸电芯边缘形成的，贯穿裸电芯厚度方向的边缘凹陷空间，第一开放空间内无裸电芯。所述裸电芯包括正极片、负极片以及用于隔离所述正极片和所述负极片的隔离膜，将裸电芯采用封装膜封装并注入电解液，即得到电池。第一开放空间由裸电芯边缘凹陷处的侧壁、裸电芯相对两表面的延伸面、边缘凹陷所在一侧的裸电芯侧面延伸面限定。第二开放空间由裸电芯边缘凹陷处的侧壁上的封装膜、裸电芯相对两表面上的封装膜的延伸面、第一封口部、和边缘凹陷所在一侧的裸电芯侧面上的封装膜的延伸面限定。
具体地，请结合图2和图3，本发明实施例提供一种电池100，包括裸电芯11和封装膜12，所述裸电芯11的边缘包括至少一个第一开放空间120，所述第一开放空间120贯穿所述裸电芯的厚度方向，所述第一开放空间120处无裸电芯，所述封装膜12围成容纳所述裸电芯11的封闭空间，所述裸电芯11容置于所述封闭空间内，所述封装膜12在所述第一开放空间120处形成第一封口部121，所述第一封口部121与所述第一开放空间120侧壁上的封装膜围成第二开放空间140，所述第一开放空间120与所述第二开放空间140部分重合。
本发明实施方式中，所述第一封口部121到所述裸电芯11表面的距离小于或者等于所述裸电芯11的厚度。所述第一封口部121可以是靠近所述裸电芯11的一侧表面设置，也可以是设置在围成所述第一开放空间120的侧壁上，沿所述裸电芯11厚度方向的中部位置。
本发明实施方式中，所述第一封口部121为平板状，所述第一封口部121平行于所述裸电芯11表面，且向所述裸电芯11的表面所在平面投影时，所述第一封口部121的投影与所述第一开放空间120的投影部分或完全重合。
本发明实施方式中，在平行于所述裸电芯11表面的方向上，所述第一封口部121覆盖部 分或全部所述第一开放空间120。当所述第一封口部121覆盖部分所述第一开放空间120时，所述第一封口部121形成有缺口，所述缺口远离所述裸电芯11的边缘，即远离第一开放空间120的侧壁。所述缺口位于第一封口部121边缘，所述缺口的形状、数量不限，缺口的设置可以释放出更多空间，用于容纳电子元器件。
本发明实施方式中，所述第一封口部121与所述第一开放空间120侧壁上的封装膜相连接。
本发明实施方式中，所述封装膜11包括第一封装膜和第二封装膜，所述第一封装膜与所述第二封装膜共同形成所述封闭空间。本发明一具体实施方式中，所述第二封装膜与所述第一封装膜一体折叠成型。所述第二封装膜与所述第一封装膜一体折叠成型的一侧，与所述裸电芯11设置所述第一开放空间120的一侧边缘对应。即所述第二封装膜与所述第一封装膜一体折叠成型时，沿所述裸电芯11设置有所述第一开放空间120一侧边缘进行折叠。所述第一封装膜和所述第二封装膜一体折叠成型的一侧是连续的结构，无所述第一封装膜和所述第二封装膜两层膜贴合形成的明显分界线。
本发明实施方式中，所述第一封装膜和所述第二封装膜可以是现有常用的铝塑复合膜。具体地，所述铝塑复合膜可以是包括依次层叠的聚丙烯层、铝层和尼龙层，其中，所述尼龙层位于最外层，单层所述铝塑复合膜的厚度为50μm-100μm。所述第一封装膜和所述第二封装膜分别包覆所述裸电芯相对两侧的第一表面和第二表面，如所述第一封装膜覆盖裸电芯11的第一表面，第二封装膜覆盖裸电芯11的第二表面，所述第一封装膜和所述第二封装膜在所述裸电芯11的外周边缘处密封贴合，以实现裸电芯的封装。
本发明一实施方式中，所述第一封口部121由所述第一封装膜和所述第二封装膜紧密贴合形成。即第一封口部121的厚度等于第一封装膜和第二封装膜的厚度之和。
本发明另一实施方式中，所述第一封口部121由所述第一封装膜和所述第二封装膜紧密贴合并进一步经热压形成，所述热压可以局部区域热压，也可以是全部区域热压。经热压后，所述第一封口部121的厚度小于所述第一封装膜和所述第二封装膜的厚度之和。经热压后能形成更好的密封结构，且能进一步减小封装膜厚度，提升可利用空间。
本发明实施方式中，所述第一封口部121的厚度为20μm-300μm，进一步地，所述第一封口部121的厚度为50μm-200μm。
本发明一具体实施方式中，所述第一封装膜围成用于容纳所述裸电芯的第一凹槽，所述第一凹槽的形状与所述裸电芯完全吻合，所述第二封装膜为一平整膜层。
本发明另一具体实施方式中，所述第一封装膜围成第一凹槽，所述第二封装膜围成第二凹槽，所述第一凹槽与所述第二凹槽对合形成所述封闭空间。
本发明实施方式中，当第一开放空间120为多个时，第一封口部121也相应地为多个。所述第一开放空间120的侧壁指的是围成所述第一开放空间120的裸电芯侧边。
本发明实施方式中，所述封闭空间的形状与所述裸电芯11的形状完全吻合。
本发明实施方式中，所述裸电芯11与所述至少一个第一开放空间120可以是构成一规则立体形状，所述规则立体形状具体形状不限，在本发明一实施例中，所述裸电芯11与所述至少一个第一开放空间120构成长方体。在本发明其他实施例中，所述裸电芯11与所述至少一个第一开放空间120也可以是构成圆柱体或其他规则立体形状。
本发明实施方式中，所述裸电芯11外周边缘的第一开放空间120可以仅设置一个，也可以设置多个。多个第一开放空间120可以是设置在裸电芯11的同一侧边上，也可以是设置在裸电芯11的不同侧边上。本发明实施方式中，第一开放空间120的具体形状不限，可以是规 则的或不规则的形状，例如矩形、类矩形、梯形、圆形、半圆形等。当设置有多个第一开放空间120时，多个第一开放空间120可以是相同形状，也可以是不同形状。第一开放空间120的尺寸大小和位置可根据实际需要灵活设定。
如图3所示，本发明一实施方式中，所述第一开放空间120为类矩形，所述裸电芯11为凹字形裸电芯，所述封装膜12在所述第一开放空间120处形成第一封口部121，所述第一封口部121在所述裸电芯11表面所在平面上的投影为类矩形，所述第一封口部121在所述裸电芯11表面所在平面上的投影与所述第一开放空间在所述裸电芯11表面所在平面上的投影完全重合。可选地，所述第一开放空间120的长度L 1小于裸电芯11总长度L 3，宽度L 2小于裸电芯11总宽度L 4，高度即为裸电芯的厚度H 0，第一开放空间120的左边缘到裸电芯11的左边缘的距离L 5小于(L 4-L 2)。为保证电池具有较强的抗外力作用能力和抗跌落能力，第一开放空间120的优选长度区间为L 1＜2/3L 3，优选宽度区间为L 2＜2/3L 4。
如图4所示，本发明另一实施方式中，所述裸电芯具有一个梯形的第一开放空间，所述裸电芯与第一开放空间构成长方体，所述封装膜在所述第一开放空间处形成梯形的第一封口部121。如图5所示，本发明另一实施方式中，所述裸电芯具有两个分别设置在裸电芯相对两侧的类矩形的第一开放空间120，所述裸电芯与第一开放空间构成长方体。如图6所示，本发明另一实施方式中，所述裸电芯具有一个类矩形的第一开放空间120，所述裸电芯与第一开放空间构成长方体。如图7所示，本发明另一实施方式中，所述裸电芯具有一个类矩形的第一开放空间120，所述裸电芯与第一开放空间构成圆柱体。
本发明实施方式中，参见图3，所述第一开放空间120中形成有倒角，倒角的形状和所述裸电芯的倒角相同，所述倒角的倒角边111的长度小于或等于25mm。进一步地，所述倒角的倒角边111长度小于或等于5mm。具体地，当围成所述第一开放空间120的侧壁包括两条相交的侧边111a、111b时，所述两条相交的侧边111a、111b之间构成倒角，所述倒角边111一端与侧边111a相交，另一端与侧边111b相交。所述倒角的具体形式不限，可以是圆倒角(倒角边为圆弧边)、斜倒角(倒角边为直线边)，在其他实施方式中，倒角边111也可以是由多条边构成。当倒角为圆倒角时，倒角边111的长度即为圆弧边的长度，当倒角为斜倒角时，倒角边111的长度即为直线边的长度。
本发明实施方式中，如图8所示，所述裸电芯11的内部形成有一个或多个第三开放空间130，所述第三开放空间130贯穿所述裸电芯11的厚度方向，所述第三开放空间130无裸电芯，所述封装膜12在所述第三开放空间130处形成第二封口部，所述第二封口部不覆盖所述裸电芯，在平行于所述裸电芯11表面的方向上，所述第二封口部覆盖部分或全部所述第三开放空间130，所述第二封口部与所述第三开放空间130的侧壁上的封装膜围成第四开放空间。所述第三开放空间130可以仅设置一个，也可以设置多个。第三开放空间130的具体形状不限，可以是规则的或不规则的形状，如矩形、梯形、圆形、半圆形等。当设置有多个第三开放空间130时，多个第三开放空间130可以是相同形状，也可以是不同形状。第三开放空间130的尺寸大小可根据实际需要设定。
本发明实施方式中，第二封口部的封装膜可以是由所述第一封装膜和所述第二封装膜紧密贴合形成，也可以是由所述第一封装膜和所述第二封装膜紧密贴合并经进一步热压形成，热压可以是对部分区域或全部区域进行热压。
本发明实施方式中，所述第二封口部为平板状，所述第二封口部平行于所述裸电芯11表面，且向所述裸电芯11的表面所在平面投影时，所述第二封口部的投影与所述第三开放空间130的投影完全重合。
参见图2，本发明实施方式中，所述封装膜12还包括设置在裸电芯11边缘的折边122，折边122位于裸电芯11上未设置第一开放空间120的边缘，所述折边122由所述第一封装膜和所述第二封装膜贴合并经热压后、沿所述裸电芯11边缘折叠形成。由于所述第一封装膜与所述第一封装膜一体折叠成型，因此，图2中所述折边靠近所述封装膜一体折叠成型一侧的端部，无第一封装膜和第二封装膜两层膜合形成的明显分界线。
本发明实施方式中，所述裸电芯11可以为叠片式电芯，也可以为卷绕式电芯，具体可以是由正极片、负极片和隔膜通过叠片式形成或通过卷绕的方式形成。本发明实施方式中，第一开放空间120和第三开放空间130均不含正极片、负极片和隔膜。如图3所示，本发明实施方式中，所述裸电芯11还包括一对极耳112，所述极耳112部分露于所述封装膜12之外。所述极耳112包括正极耳和负极耳，正极耳和负极耳可设置在裸电芯11的同一侧边上，也可以设置在不同侧边上。所述极耳112可设置在所述裸电芯11设置所述第一开放空间的一侧边缘，也可设置在所述裸电芯11未设置所述第一开放空间的一侧边缘。
本发明实施例提供的电池，在维持电池形状灵活性的基础上，通过保留电池封装过程中封装膜在裸电芯边缘开放空间产生的第一封口部，从而显著减少了整个封装过程中封装膜的裁切和折边操作次数，简化了封装工艺，提高了封装效率；且所述裸电芯的第一开放空间的角位处无需设置大尺寸倒角，优化了裸电芯结构设计，避免了能量密度损失，同时也降低了极片裁切难度。
相应地，本发明实施例还提供了上述电池的封装方法，包括如下步骤：
S110、提供一平整封装膜，在所述封装膜上冲压形成用于容纳裸电芯的第一凹槽，所述裸电芯的边缘形成有至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯，所述第一凹槽的形状与所述裸电芯的形状完全吻合；
S120、将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜，所述第一凹槽位于所述第一封装膜上；
S130、将所述裸电芯置于所述第一凹槽中，使所述第一封装膜和所述第二封装膜在所述第一凹槽的其余边缘贴合，并密封得到一封闭空间，以将所述裸电芯封装，得到电池，所述第一封装膜和所述第二封装膜在所述第一开放空间处紧密贴合，或紧密贴合后经进一步热压形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
本发明实施方式中，所述将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜的具体操作为：将所述封装膜沿所述第一凹槽的与所述第一开放空间对应的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜。
本发明实施例还提供了上述电池的封装方法，包括如下步骤：
S210、提供一平整封装膜，在所述封装膜上冲压形成用于容纳裸电芯的第一凹槽和第二凹槽，所述第一凹槽与所述第二凹槽对称且相邻接设置，所述裸电芯的边缘形成有至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯；
S220、将所述封装膜沿所述第一凹槽或所述第二凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜，所述第一凹槽位于所述第一封装膜上，所述第二凹槽位于所述第二封装膜上；
S230、将所述裸电芯置于所述第一凹槽中，使所述第一封装膜和所述第二封装膜在所述第一凹槽的其余边缘贴合并密封，所述第一凹槽与所述第二凹槽对合，形成与所述裸电芯形 状完全吻合的一封闭空间，以将所述裸电芯封装，得到电池，所述第一封装膜和所述第二封装膜在所述第一开放空间处紧密贴合，或紧密贴合后经进一步热压形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
本发明实施方式中，所述将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜的具体操作为：将所述封装膜沿所述第一凹槽的与所述第一开放空间对应的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜。
请参见图9A-9F，本发明一具体实施例中，所述电池的封装方法包括如下步骤：
S101、提供平整的封装膜12’，在平整的封装膜12’上冲压形成用于容纳裸电芯11的第一凹槽124，所述第一凹槽124的形状与所述裸电芯11的形状完全相同；
本发明实施方式中，平整封装膜12’上可以只冲压出第一凹槽124，也可以冲压出对称设置的第一凹槽124和第二凹槽。图9A为本发明一实施方式中冲坑后的封装膜12’结构示意图。如图9A所示，本实施方式中封装膜12’上只冲压出第一凹槽124，冲坑后，所述封装膜12’的第一凹槽124以外的区域仍保持平整。本发明实施方式中，所述封装膜12’可以是现有常用的铝塑复合膜。参见图9D，所述裸电芯11的的边缘形成有至少一个无裸电芯的第一开放空间120，所述裸电芯11与所述至少一个第一开放空间120构成一长方体。
S102、冲坑工序结束后，将所述封装膜12’沿所述第一凹槽124的一侧边缘进行折叠，使封装膜12’弯折成类U字型，如图9B和图9C所示。弯折后的封装膜12’可以分为上、下两部分，以折叠线作为界线，将含有第一凹槽124的部分封装膜定义为第一封装膜13，不带凹槽的平整部分封装膜定义为第二封装膜14；
本发明实施方式中，为了操作方便，如图9B所示，折叠操作可以是沿所述第一开放空间120所对应的一侧的边缘113进行折叠，使所述封装膜12’分为第一封装膜13和第二封装膜14。这样可免去对第一开放空间120所对应的一侧边缘113的封装膜进行裁切、热压密封和折边操作。当然为了获得更好的密封效果，减小封装膜厚度以提升可利用空间，也可进一步对第一开放空间120的相互贴合的第一封装膜13和第二封装膜14的局部区域进行热压操作，也可以对其全部区域进行热压操作。
S103、封装膜12’弯折后，如图9D所示，将所述裸电芯11置于所述第一凹槽124中，然后将第一封装膜、第二封装膜沿着折叠线继续折叠，直到第一封装膜13、第二封装膜14完全贴合并形成闭合。如图9E所示，第一封装膜13、第二封装膜14完全闭合后，第一封装膜13、第二封装膜14的平整区域相互贴合，形成延伸边；裸电芯11的主体被包裹在封装膜第一凹槽124内部；部分极耳密封胶和极耳112裸露在封装膜外。第一封装膜13、第二封装膜14贴合形成左边缘延伸边123、右边缘延伸边124、上边缘延伸边125和第一封口部121，每条延伸边和第一封口部皆由上、下两层封装膜相互贴合形成。其中左边缘延伸边123、右边缘延伸边124和上边缘延伸边125为封装产生的常规延伸边，此外，封装膜闭合后在第一开放空间120的对应位置还形成了第一封口部121。随后需要对封装膜的左边缘延伸边123和上边缘延伸边125进行密封操作。若封装膜使用铝塑复合膜，则通常使用热压的方法进行密封。具体是通过加热使延伸边上、下层铝塑复合膜的内层聚丙烯层熔化，然后通过施加压力，使两个相对的聚丙烯层相互熔合，待冷却至室温后，聚丙烯层重新凝固，延伸边处的两层铝塑复合膜即被密封在一起。完成左边缘延伸边123和上边缘延伸边125的密封后，电池需经过常规的烘烤、注液、化成、除气工序，再采用相同的密封方法将右边缘延伸边124进行密封。对于第一封口部121，由于其本身处于封口状态，并且在电池除气工序时通过真空抽气可以保证该区域 上、下层封装膜紧密贴合，因此第一封口部121无须再进行密封操作；若为了进一步保证密封效果，也可以选择对第一封口部121进行部分区域或全部区域的密封操作。密封后形成的第一封口部121的厚度小于第一封装膜和第二封装膜的厚度之和。延伸边密封完成后，将左边缘延伸边123、右边缘延伸边124裁切到合适的宽度值，该宽度值小于或等于电池的总厚度。最后，将左边缘延伸边123沿其右边缘线顺时针折叠，右边缘延伸边124沿其左边缘线逆时针折叠，使左、右边缘延伸边与封装膜第一凹槽124的两个侧面相贴合，形成折边122，即完成整个电池的封装，得到如图9F所示的电池。本发明该具体实施方式中，整个封装工序只对左边缘延伸边123和右边缘延伸边124进行折边操作，裸电芯各角位处均不涉及折边操作，因此无需设置大尺寸倒角；且第一封口部121厚度较小使得电池在第一开放空间120的对应位置形成了第二开放空间140，第二开放空间140可用于放置其他电子元器件。
当然，在本发明其他实施例中，为了在裸电芯11的第一开放空间120处留出更大的空间用于容置电子元器件，可将第一封口部121裁切掉一部分，形成缺口，裁切后的第一封口部121在平行于裸电芯11表面的方向上部分覆盖所述第一开放空间120，为保证密封效果，裁切时裁切线与裸电芯11边缘预留一定距离。
本发明实施例上述提供的封装方法，工序简单，封装效率高，适合各种异形电池的封装。
本发明实施例还提供一种终端，包括壳体、以及收容于所述壳体内的显示模组、电子元器件模组和电池，所述电池为所述显示模组和所述电子元器件模组供电，所述电池为本发明实施例上述提供的电池。本发明实施方式中，所述第二开放空间设置有电子元器件。
本发明实施例提供的终端，由于所使用的电池所占的终端设备内部空间很小，在裸电芯的第一开放空间的相应位置处形成了第二开放空间，第二开放空间可用于放置其他电子元器件，从而进一步提高设备内部的空间利用率。

Claims (30)

  1. 一种电池的封装方法，其特征在于，包括如下步骤：
    提供一平整封装膜，在所述封装膜上冲压形成用于容纳裸电芯的第一凹槽，所述裸电芯的边缘形成有至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯，所述第一凹槽的形状与所述裸电芯的形状完全吻合；
    将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜，所述第一凹槽位于所述第一封装膜上；
    将所述裸电芯置于所述第一凹槽中，使所述第一封装膜和所述第二封装膜在所述第一凹槽的其余边缘贴合，并密封得到一封闭空间，以将所述裸电芯封装，得到电池，所述第一封装膜和所述第二封装膜在所述第一开放空间处紧密贴合，或紧密贴合后经进一步热压形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
  2. 如权利要求1所述的电池的封装方法，其特征在于，所述将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜的具体操作为：将所述封装膜沿所述第一凹槽的与所述第一开放空间对应的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜。
  3. 一种电池的封装方法，其特征在于，包括如下步骤：
    提供一平整封装膜，在所述封装膜上冲压形成用于容纳裸电芯的第一凹槽和第二凹槽，所述第一凹槽与所述第二凹槽对称且相邻接设置，所述裸电芯的边缘形成有至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯；
    将所述封装膜沿所述第一凹槽或所述第二凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜，所述第一凹槽位于所述第一封装膜上，所述第二凹槽位于所述第二封装膜上；
    将所述裸电芯置于所述第一凹槽中，使所述第一封装膜和所述第二封装膜在所述第一凹槽的其余边缘贴合并密封，所述第一凹槽与所述第二凹槽对合，形成与所述裸电芯形状完全吻合的一封闭空间，以将所述裸电芯封装，得到电池，所述第一封装膜和所述第二封装膜在所述第一开放空间处紧密贴合，或紧密贴合后经进一步热压形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
  4. 如权利要求3所述的电池的封装方法，其特征在于，所述将所述封装膜沿所述第一凹槽的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜的具体操作为：将所述封装膜沿所述第一凹槽的与所述第一开放空间对应的一侧边缘进行折叠，使所述封装膜分为第一封装膜和第二封装膜。
  5. 一种电池，其特征在于，包括裸电芯和封装膜，所述裸电芯的边缘包括至少一个第一开放空间，所述第一开放空间贯穿所述裸电芯的厚度方向，所述第一开放空间处无裸电芯，所述封装膜围成容纳所述裸电芯的封闭空间，所述封装膜在所述第一开放空间处形成第一封口部，所述第一封口部不覆盖所述裸电芯，所述第一封口部与所述第一开放空间侧壁上的封装膜围成第二开放空间，所述第一开放空间与所述第二开放空间部分重合。
  6. 如权利要求5所述的电池，其特征在于，所述第一封口部到所述裸电芯表面的距离小于或者等于所述裸电芯的厚度。
  7. 如权利要求5所述的电池，其特征在于，所述第一封口部为平板状，所述第一封口部 平行于所述裸电芯表面，向所述裸电芯的表面所在平面投影时，所述第一封口部的投影与所述第一开放空间的投影部分或完全重合。
  8. 如权利要求5所述的电池，其特征在于，所述第一封口部形成有缺口，所述缺口远离所述第一开放空间的侧壁。
  9. 如权利要求5所述的电池，其特征在于，在平行于所述裸电芯表面的方向上，所述第一封口部覆盖部分或全部所述第一开放空间。
  10. 如权利要求5所述的电池，其特征在于，所述封装膜包括第一封装膜和与所述第一封装膜一体折叠成型的第二封装膜。
  11. 如权利要求10所述的电池，其特征在于，所述第一封装膜和所述第二封装膜一体折叠成型的一侧是连续的结构，无所述第一封装膜和所述第二封装膜两层膜贴合形成的明显分界线。
  12. 如权利要求10所述的电池，其特征在于，所述第二封装膜与所述第一封装膜一体折叠成型的一侧，与所述裸电芯设置所述第一开放空间的一侧边缘对应。
  13. 如权利要求5所述的电池，其特征在于，所述第一开放空间形成有倒角，所述倒角的倒角边的长度小于或等于25mm。
  14. 如权利要求5所述的电池，其特征在于，所述第一开放空间形成有倒角，所述倒角的倒角边长度小于或等于5mm。
  15. 如权利要求5所述的电池，其特征在于，所述第一开放空间为类矩形，所述裸电芯为凹字形裸电芯。
  16. 如权利要求10所述的电池，其特征在于，所述第一封装膜围成用于容纳所述裸电芯的第一凹槽，所述第一凹槽的形状与所述裸电芯的形状完全吻合，所述第二封装膜为一平整膜层。
  17. 如权利要求10所述的电池，其特征在于，所述第一封装膜围成第一凹槽，所述第二封装膜围成第二凹槽，所述第一凹槽与所述第二凹槽对合形成所述封闭空间。
  18. 如权利要求10所述的电池，其特征在于，所述第一封口部由所述第一封装膜与所述第二封装膜紧密贴合形成。
  19. 如权利要求10所述的电池，其特征在于，所述第一封口部由所述第一封装膜与所述第二封装膜紧密贴合并进一步经热压形成。
  20. 如权利要求5所述的电池，其特征在于，所述裸电芯与所述至少一个第一开放空间构成一规则立体形状。
  21. 如权利要求20所述的电池，其特征在于，所述裸电芯与所述至少一个第一开放空间构成长方体或圆柱体。
  22. 如权利要求5所述的电池，其特征在于，所述裸电芯的内部还包括一个或多个第三开放空间，所述第三开放空间贯穿所述裸电芯的厚度方向，所述第三开放空间处无裸电芯，所述封装膜在所述第三开放空间处形成第二封口部，所述第二封口部不覆盖所述裸电芯，所述第二封口部覆盖部分或全部所述第三开放空间，所述第二封口部与所述第三开放空间的侧壁上的封装膜围成第四开放空间。
  23. 如权利要求22所述的电池，其特征在于，所述封装膜包括第一封装膜和第二封装膜，所述第二封口部由所述第一封装膜和所述第二封装膜紧密贴合形成。
  24. 如权利要求22所述的电池，其特征在于，所述封装膜包括第一封装膜和第二封装膜，所述第二封口部由所述第一封装膜和所述第二封装膜紧密贴合并进一步经热压形成。
  25. 如权利要求5所述的电池，其特征在于，所述裸电芯为叠片式电芯或卷绕式电芯。
  26. 如权利要求5所述的电池，其特征在于，所述裸电芯还包括设置在所述裸电芯同一侧的一对极耳，所述极耳部分露出于所述封装膜。
  27. 如权利要求22所述的电池，其特征在于，所述极耳位于所述裸电芯设置所述第一开放空间的一侧边缘。
  28. 如权利要求22所述的电池，其特征在于，所述极耳位于所述裸电芯未设置所述第一开放空间的一侧边缘。
  29. 一种终端，其特征在于，包括壳体、以及收容于所述壳体内的显示模组、电子元器件模组和电池，所述电池为所述显示模组和所述电子元器件模组供电，所述电池为权利要求5-28任一项所述的电池。
  30. 如权利要求29所示的终端，其特征在于，所述第二开放空间内设置有电子元器件。
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