WO2023185200A1 - 电化学装置及其制备方法、电子装置 - Google Patents

电化学装置及其制备方法、电子装置 Download PDF

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Publication number
WO2023185200A1
WO2023185200A1 PCT/CN2023/071134 CN2023071134W WO2023185200A1 WO 2023185200 A1 WO2023185200 A1 WO 2023185200A1 CN 2023071134 W CN2023071134 W CN 2023071134W WO 2023185200 A1 WO2023185200 A1 WO 2023185200A1
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WO
WIPO (PCT)
Prior art keywords
electrochemical device
folding
end wall
corner
conductive plate
Prior art date
Application number
PCT/CN2023/071134
Other languages
English (en)
French (fr)
Inventor
方德凱
Original Assignee
东莞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 东莞新能源科技有限公司 filed Critical 东莞新能源科技有限公司
Priority to JP2023525445A priority Critical patent/JP2024515916A/ja
Priority to US18/472,448 priority patent/US20240014484A1/en
Publication of WO2023185200A1 publication Critical patent/WO2023185200A1/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
    • 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 of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or 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
    • H01M50/50—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of energy storage technology, and in particular, to an electrochemical device and a preparation method thereof, as well as an electronic device having the electrochemical device.
  • the packaging bag includes a main body and a sealing part.
  • the electrode assembly is arranged in the main body, and the conductive plate is electrically connected to the electrode assembly.
  • the direction in which the conductive plate protrudes from the electrode assembly is defined as the first direction
  • the thickness direction of the electrode assembly is defined as the second direction
  • the direction perpendicular to the first direction and the second direction is defined as the third direction.
  • the main body part includes a first end wall and a second end wall that are oppositely arranged in the first direction, and also includes a first side wall and a second side wall that are oppositely arranged in the third direction.
  • the sealing part includes a first sealing part and a first flanging part.
  • the first sealing part is connected to the first end wall, and the conductive plate extends out of the packaging bag from the first sealing part.
  • the first flanging portion is connected to the first side wall, and the first flanging portion and the first side wall are arranged oppositely in the third direction.
  • the first sealing portion and the first flange portion intersect in the transition zone.
  • the electrochemical device is provided with a folded-angle structure, which is formed by folding the transition region toward the first end wall at least twice.
  • this application not only reduces the size of the first flange portion in the first direction, but also helps reduce the size of the first sealing portion in the third direction. This reduces the space occupied by the transition zone and increases the energy density of the electrochemical device.
  • at least two folds are provided so that the electrochemical device has a missing corner when viewed from the second direction, and the size of the missing corner can be changed according to actual needs, so that the shape of the electrochemical device is consistent with the actual shape of the battery compartment of the electronic device. While matching the shape, the impact of the specific shape of the battery compartment on the energy density of the electrochemical device is reduced.
  • the angled structure formed by two folds can also reduce the possibility that the transition area will be washed away during mechanical abuse and cause liquid leakage.
  • the folded corner structure is formed by folding the transition region toward the first end wall twice after forming the first folded edge portion. It can reduce the space occupied by the transition zone and increase the energy density; it can reduce the impact of the corner structure on the strength of the packaging bag corners, reduce the risk of packaging bag damage and leakage; and it can improve production efficiency.
  • the corner structure includes a first corner part and a second corner part, the first corner part is formed by the first folding, and the second corner part is formed by the second folding. Viewed from the second direction, the second corner portion at least partially covers the first corner portion. In this way, the possibility of the second corner portion opening compared with the first corner portion can be reduced to a certain extent, and it is also beneficial to increase the energy density.
  • the electrochemical device includes a first bevel line and a second bevel line.
  • the first fold line includes a first segment and a second segment.
  • the first section is arranged on the first corner portion.
  • the second section and the second corner line are provided on the second corner portion.
  • the first flange portion viewed from the third direction, includes a first side and a second side that are oppositely arranged in the second direction, and the second side is connected to the first side wall.
  • the first segment intersects the first side at the first intersection point
  • the second angled line intersects the first segment at the second intersection point.
  • the first intersection point and the second intersection point do not coincide. In this way, the possibility of the packaging bag breaking at the overlapping intersection point and causing liquid leakage can be reduced, and the production efficiency can be easily improved.
  • the first intersection point and the second intersection point coincide with each other to further increase the energy density.
  • the angle between the first section and the third direction is ⁇ , and 70° ⁇ 90°. In this way, subsequent folding can be easily implemented and the effect of subsequent folding can be improved. It can also reduce the possibility that the folding area formed during the first folding is close to the conductive plate or even the conductive plate is bent during the first folding.
  • the angle between the second folding line and the third direction is ⁇ , and ⁇ .
  • the first corner portion is bonded to the second corner portion, thereby reducing the possibility that the second corner portion is splayed compared to the first corner portion.
  • the first seal includes a first zone and a transition zone.
  • the first area connects the first end wall of the portion.
  • the transition zone includes a first partition and a second partition, and the second partition is connected to another part of the first end wall.
  • the first sealing part and the first flanging part intersect at the first partition.
  • the first corner portion includes a portion of the second zone. Therefore, after the first folding, the size of the first sealing part in the third direction is reduced, which is beneficial to further increasing the energy density.
  • the electrochemical device further includes a circuit board, and the circuit board is electrically connected to the conductive plate.
  • the first sealing part and the first end wall together form an accommodating space, and the circuit board is disposed in the accommodating space. In this way, the impact of the arrangement of the circuit board on the energy density of the electrochemical device can be reduced.
  • the first flanging part has a single flanging structure or a double flanging structure.
  • the double-folding structure can reduce the risk of short-circuit with the outside world after the metal layer of the packaging bag is exposed.
  • the thickness of the packaging bag in the second direction is 50 ⁇ m to 130 ⁇ m. Setting the thickness of the packaging bag within this range can meet the impact of setting the corner structure on the strength of the packaging bag, meet safety and life requirements, and make it easy to implement the corner structure in the process.
  • This application also provides an electronic device, including a battery compartment and the above electrochemical device.
  • the electrochemical device is located in the battery compartment.
  • the battery compartment is curved.
  • the electrochemical device has a missing corner when viewed from the second direction, and the size of the missing corner can be changed according to actual needs, so that the shape of the electrochemical device is consistent with the actual shape of the battery compartment of the electronic device. While matching, the impact of a specific shape of the battery compartment on the energy density of the electrochemical device can be greatly reduced.
  • a third aspect of the present application provides a method for preparing an electrochemical device, including the following steps: preparing an electrode assembly, and electrically connecting the electrode assembly to a first conductive plate; and placing the electrode assembly with the first conductive plate into a packaging bag. and sealing to form a sealing part, the first conductive plate extends out of the packaging bag from the first sealing part; fold the sealing part to be opposite to the first side wall to form a first folding part; move the transition area toward the first end
  • the walls are folded at least twice to form an angled structure.
  • the transition region is folded toward the first end wall for the first time; and the transition region is folded toward the first end wall for the second time, thereby forming a angled structure.
  • Figure 1 is a front view of an electrochemical device provided by an embodiment of the present application.
  • FIG. 2 is a partial enlarged view of the electrochemical device shown in FIG. 1 at II.
  • FIG. 3 is a schematic diagram of the electrochemical device shown in FIG. 1 before packaging.
  • FIG. 4A is a cross-sectional view of the electrochemical device shown in FIG. 1 along IVA-IVA.
  • FIG. 4B is a cross-sectional view along IVB-IVB of the electrochemical device shown in FIG. 1 .
  • Figure 4C is a cross-sectional view along IVA-IVA of the electrochemical device shown in Figure 1 in other embodiments.
  • FIG. 5 is a cross-sectional view of the packaging film of the electrochemical device shown in FIG. 1 .
  • Fig. 6 is a front view of the electrochemical device shown in Fig. 1 before the first folding portion of the packaging bag is folded.
  • Figure 7 is a front view of the first folded edge portion shown in Figure 6 after being folded.
  • Figure 8 is a front view of the transition area of the packaging bag shown in Figure 7 after it has been folded for the first time.
  • FIG. 9 is a partial enlarged view of the electrochemical device shown in FIG. 8 at position IX.
  • Figure 10 is a cross-sectional view of an electrochemical device provided by another embodiment of the present application.
  • Figure 11 is a front view of an electrochemical device provided by yet another embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of an electronic device provided by another embodiment of the present application.
  • FIG. 13 is a schematic diagram of the internal structure of the electronic device shown in FIG. 12 .
  • Figure 14 is a flow chart of a method for preparing an electrochemical device according to another embodiment of the present application.
  • Electrode assembly 20 Positive electrode sheet twenty one Negative plate twenty two Isolation film twenty three first pole twenty four first conductive plate 30 Second conductive plate 40 first bonding part 50 Second bonding part 60 angled structure 70, 80 first corner part 71 second corner part 72 first fold line 73 Second fold line 74 circuit board 90 first protective layer 101 first metal layer 102 first polymer layer 103 first end wall 111 second end wall 112 first side wall 113
  • Second side wall 114 first sealing part 121 first folding part 122 first side 122a second side 122b Second folding part 123 electrochemical device 100, 200, 300 first paragraph 731 Second paragraph 732 second intersection point 740 third intersection 741 Transition zone 1200 first division 1201 second division 1202 Division 3 1203 District 1 1211 edge 1202a
  • the third bonding part 1220 District 2 1221 first intersection 7310 fourth intersection 7311 first direction X second direction Y third direction Z fold area A Division 4 A1 Division 5 A2 thickness T Angle ⁇ , ⁇ concavity S1 accommodation space S2
  • spatially relative terms such as “on,” etc., may be used herein for convenience to describe the relationship of one element or feature to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device or device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the diagram is turned over, features described as “above” or “on” other features or features would then be oriented “below” or “beneath” the other features or features. Thus, the exemplary term “upper” may include both upper and lower directions. It will be understood that, although the terms first, second, third, etc.
  • an electrochemical device 100 including a packaging bag 10 , an electrode assembly 20 , a first conductive plate 30 and a second conductive plate 40 .
  • the electrode assembly 20 is located in the packaging bag 10 .
  • the first conductive plate 30 and the second conductive plate 40 are both electrically connected to the electrode assembly 20 and extend out of the packaging bag 10 .
  • the first conductive plate 30 and the second conductive plate 40 can be connected to external components (not shown).
  • electrode assembly 20 may be in a rolled configuration.
  • the electrode assembly 20 includes a positive electrode sheet 21 , a negative electrode sheet 22 and a separation film 23 .
  • the positive electrode sheet 21, the separator 23 and the negative electrode sheet 22 are stacked and wound in sequence.
  • the first conductive plate 30 is electrically connected to the positive electrode sheet 21, and the second conductive plate 40 is electrically connected to the negative electrode sheet 22.
  • the electrode assembly 20 has a multi-lug structure, which also includes a plurality of first tabs 24 and a plurality of second tabs (not shown).
  • One end of the first tab 24 is electrically connected to the positive electrode piece 21 , and the other end is electrically connected to the first conductive plate 30 .
  • One end of the second tab is electrically connected to the negative electrode sheet 22 , and the other end is electrically connected to the second conductive plate 40 .
  • FIG. 1 please refer to FIG.
  • the electrode assembly 20 may not include the first tab 24 and the second tab.
  • the electrode assembly 20 may also have a laminated structure, that is, the positive electrode sheet 21, the isolation film 23 and the negative electrode sheet 22 are stacked in sequence.
  • the packaging bag 10 includes a main body part 11 and a sealing part 12 .
  • the electrode assembly 20 is provided in the main body 11 .
  • the direction in which the first conductive plate 30 or the second conductive plate 40 protrudes from the electrode assembly 20 (that is, the direction from the electrode assembly 20 to the first conductive plate 30 or the second conductive plate 40) is defined as the first direction X.
  • the electrode assembly 20 The thickness direction of is the second direction Y, and the direction perpendicular to the first direction X and the second direction Y is the third direction Z.
  • the second direction Y is also a direction perpendicular to the surface of the first conductive plate 30 or the second conductive plate 40 .
  • the third direction Z is also the direction from the first conductive plate 30 to the second conductive plate 40 .
  • FIG. 3 is a schematic structural diagram of the electrochemical device 100 before packaging.
  • the packaging bag 10 includes a first packaging film 10a and a second packaging film 10b that are oppositely arranged in the second direction Y, and the packaging bag 10 is packaged by the first packaging film 10a and the second packaging film 10b.
  • the first encapsulation film 10a and the second encapsulation film 10b can be obtained by folding the same encapsulation film, and the folding position of the first encapsulation film 10a and the second encapsulation film 10b corresponds to the electrode assembly 20 being away from the first conductive plate. 30 and the tail of the second conductive plate 40.
  • the first packaging film 10a includes a first film region 10a1 and a second film region 10a2 that are connected to each other. Three sides of the second film area 10a2 are surrounded by the first film area 10a1.
  • the second packaging film 10b includes a third film region 10b1 and a fourth film region 10b2 that are connected to each other. Three sides of the fourth film area 10b2 are surrounded by the third film area 10b1.
  • the second film area 10a2 of the first packaging film 10a is provided with a recess S1.
  • the second film area 10a2 and the fourth film area 10b2 together form the main body part 11 for accommodating the electrode assembly 20. Please refer to Figure 3 and Figure 4A together.
  • the head of the packaging equipment can be used to apply a certain temperature and pressure to the first film area 10a1 and the third film area 10b1 at the same time.
  • the three membrane areas 10b1 are connected to form a sealing portion 12, thereby closing the main body portion 11 for accommodating the electrode assembly 20 in the first direction X, thereby reducing the risk of liquid leakage.
  • the materials of the first packaging film 10a and the second packaging film 10b are both multi-layer sheets.
  • the first encapsulation film 10 a may include a first protective layer 101 , a first metal layer 102 and a first polymer layer 103 that are stacked in sequence.
  • the first polymer layer 103 is closer to the electrode assembly 20 .
  • the material of the first protective layer 101 can be polymer resin, which can be used to protect the first metal layer 102 and reduce the risk of damage of the first metal layer 102 due to external force. At the same time, it can delay the air infiltration of the external environment and maintain the electrochemical device. 100 inside in a normal operating environment.
  • the material of the first protective layer 101 can be selected from the group consisting of ethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride, polytetrafluoroethylene, polypropylene, and polyamide. , at least one of polyimide.
  • the first metal layer 102 can be used to delay the penetration of moisture from the external environment and reduce damage to the electrode assembly 20 caused by external forces.
  • the first metal layer 102 may be an aluminum foil layer or a steel foil layer.
  • the first polymer layer 103 has the property of being heated and melted, can be used for packaging, and can reduce the risk of the multi-layer sheet being dissolved or swollen by the organic solvent in the electrolyte.
  • the first polymer layer 103 can also be used to reduce the risk of the electrolyte in the electrolyte coming into contact with the first metal layer 102, causing the metal layer to be corroded.
  • the first polymer layer 103 includes a polymer material, which may be selected from at least one polymer material selected from polypropylene, propylene copolymer, polyethylene, and polymethylmethacrylate.
  • An adhesive layer may be disposed between the first protective layer 101 and the first metal layer 102 for bonding the first protective layer 101 and the first metal layer 102 together.
  • the second encapsulation film 10b may include a second protective layer (not shown), a second metal layer (not shown), and a second polymer layer (not shown) stacked in sequence.
  • the materials of the second protective layer, the second metal layer and the second polymer layer are respectively the same as those of the first protective layer 101,
  • the first metal layer 102 and the first polymer layer 103 are made of the same material and will not be described again here.
  • the first polymer layer 103 and the second polymer layer are melted and bonded to each other.
  • the thickness T (see FIG. 4A ) of the packaging bag 10 is 50 ⁇ m to 130 ⁇ m.
  • the thickness of the packaging bag 10 refers to the thickness of the first packaging film 10a or the thickness of the second packaging film 10b. Setting the thickness T within this range can satisfy the impact of setting the corner structure 70 on the strength of the packaging bag 10 , meet safety and life requirements, and make it easier to fold the corner structure 70 during the process.
  • the thickness of the first protective layer can be set to 15 ⁇ m, the thickness of the first metal layer 102 is 40 ⁇ m, and the thickness of the first polymer layer 103 is 30 ⁇ m.
  • the main body 11 includes a first end wall 111 and a second end wall 112 that are oppositely arranged in the first direction X.
  • the main body part 11 also includes a first side wall 113 and a second side wall 114 that are oppositely arranged in the third direction Z.
  • the surface on which the first end wall 111 is located may extend in the second direction Y and the third direction Z
  • the surface on which the second end wall 112 is located may extend in the second direction Y and the third direction Z.
  • the first side wall 113 is connected between the first end wall 111 and the second end wall 112
  • the second side wall 114 is connected between the first end wall 111 and the second end wall 112
  • the surface on which the first side wall 113 is located may extend in the first direction X and the second direction Y
  • the surface on which the second side wall 114 is located may extend in the first direction X and the second direction Y. It should be understood that in FIG.
  • the reference numeral 111 points to the left side of the first conductive plate 30
  • the corresponding position on the right side of the first conductive plate 30 is also the first end wall 111
  • the arrangement form of the first end wall 111 can be based on
  • the arrangement of the recessed portion of the packaging bag 10 changes.
  • a recessed portion can be provided in one of the first packaging film 10a and the second packaging film 10b, or both the first packaging film 10a and the second packaging film 10b can be provided with a recessed portion; in Figure 4B
  • the arrangement form of the first side wall 113 and the second side wall 114 can also be changed according to the arrangement form of the recess of the packaging bag 10 .
  • the sealing part 12 includes a first sealing part 121 and a first flanging part 122 .
  • the first sealing part 121 is connected to the first end wall 111 , and the first conductive plate 30 and the second conductive plate 40 extend out of the packaging bag 10 from the first sealing part 121 .
  • the electrochemical device 100 further includes a first adhesive member 50 and a second adhesive member 60 .
  • the first adhesive member 50 is used to connect the first sealing part 121 and the first conductive plate 30 , and part of the first adhesive member 50 is provided outside the first sealing part 121 .
  • the second adhesive member 60 is used to connect the first sealing part 121 and the second conductive plate 40 , and part of the second adhesive member 60 is provided outside the first sealing part 121 .
  • the first flange portion 122 is connected to the first side wall 113, and the first flange portion 122 and the first side wall 113 are oppositely arranged in the third direction Z.
  • the first flange portion 122 is a single flange structure formed after one folding. That is, the sealing portion 12 connected to the first side wall 113 is folded once and is opposed to the first side wall 113 in the third direction Z to form the first folding portion 122 .
  • FIG. 6 shows the structure of the first flange portion 122 before folding. At this time, the plane where the first flange portion 122 is located extends in the first direction X and the third direction Z. As shown in FIG.
  • the first flange portion 122 After being folded once, the first flange portion 122 is arranged opposite the first side wall 113 in the third direction Z, thereby reducing the size of the electrochemical device 100 in the third direction Z and improving space utilization and energy density.
  • the first flange portion 122 and the first side wall 113 may be bonded.
  • the third adhesive member 1220 may be provided between the first flange portion 122 and the first side wall 113 .
  • the third adhesive member 1220 may be double-sided tape or hot melt adhesive.
  • the material of the adhesive layer in the double-sided tape can be selected from one or more of acrylate, polyurethane, rubber and silicone.
  • the hot melt adhesive can be selected from polyolefin hot melt adhesive, polyurethane hot melt adhesive, ethylene and other materials. This application is not limited to one or more of copolymer hot melt adhesives, polyester hot melt adhesives, polyamide hot melt adhesives, styrene and its block copolymer hot melt adhesives.
  • the sealing part 12 may further include a second flange part 123 .
  • the second flange portion 123 is connected to the second side wall 114 , and the second flange portion 123 and the second side wall 114 are oppositely arranged in the third direction Z.
  • the second folding portion 123 is also a single folding structure formed after one folding, that is, the partial sealing portion 12 connected to the second side wall 114 is arranged opposite to the second side wall 114 after being folded once.
  • the second flange portion 123 is formed to further reduce the size of the electrochemical device 100 in the third direction Z and improve space utilization and energy density.
  • the first sealing part 121 includes a transition zone 1200 and a first zone 1211 arranged sequentially in the third direction Z.
  • the first zone 1211 connects part of the first end wall 111 .
  • the transition area 1200 includes a first partition 1201 and a second partition 1202, and the second partition 1202 connects another part of the first end wall 111.
  • the first flanging portion 122 includes second areas 1221 and the above-mentioned first partitions 1201 which are arranged sequentially in the first direction X.
  • the second areas 1221 are connected to the first side wall 113 . That is, the first sealing part 121 and the first flanging part 122 intersect at the first partition 1201 .
  • the transition area 1200 may further include a third partition 1203 connecting a portion of the first side wall 113 and a second area 1221 connecting another portion of the first side wall 113 .
  • the electrochemical device 100 is also provided with a corner structure 70 .
  • the corner structure 70 is formed after the first folding portion 122 is formed (that is, after the partial sealing portion 12 connected to the first side wall 113 is folded to be opposite to the first side wall 113 to form the first folding portion 122 ), the transition area is 1200 is formed by folding twice toward the first end wall 111 .
  • FIG. 6 shows the structure of the transition region 1200 before folding, when the plane where the transition region 1200 is located extends in the first direction X and the second direction Y.
  • FIG. 7 shows the structure after the first folding portion 122 is formed. It can be understood that during the process of forming the first folding portion 122 , the second partition 1202 may not be folded.
  • the transition area 1200 is folded for the first time around the first folding line 73 (in FIG. 9 ) toward the first end wall 111 to form the first folding edge portion 122 . Corner part 71. Then, the transition area 1200 is folded for a second time around the second corner line 74 toward the first end wall 111 to form the second corner portion 72 as shown in FIG. 2 .
  • part of the second partition 1202 in the transition area 1200 is folded toward the first end wall 111 , so that FIG. 2
  • the formed second corner portion 72 includes a portion of the second partition 1202 , and at this time, the second corner line 74 intersects the edge 1202 a of the second partition 1202 at a third intersection point 741 . Therefore, compared with folding the transition area 1200 once, folding twice can be beneficial to reducing the size of the first sealing portion 121 in the third direction Z.
  • the second folding can cause the electrochemical device 100 to have a missing corner when viewed from the second direction Y, and the size of the missing corner can be changed according to actual needs, so that the shape of the electrochemical device 100 can be adjusted according to the shape of the battery compartment of the electronic device. Actual shape adaptation. Please refer to FIGS. 1 and 2 in conjunction.
  • the third intersection point 741 is disposed apart from the side of the first adhesive member 50 away from the second adhesive member 60 .
  • the transition region 1200 is folded again at least once to further adjust the angled structure 70 to increase energy density.
  • the folding area that is folded toward the first end wall 111 for the first time is defined as A, and the folding area A is divided into a fourth partition A1 and a fifth partition A2.
  • the fourth partition A1 will continue to form a part of the second corner portion 72 after the second folding. Therefore, the above-mentioned first corner portion 71 refers to the first folding toward the first end wall 111 , but Areas that are not folded a second time. That is, the first corner portion 71 refers to the fifth partition A2.
  • the present application not only reduces the size of the first flange portion 122 in the first direction
  • the dimensions in the three directions Z can thereby reduce the space occupied by the transition region 1200 and increase the energy density of the electrochemical device 100 .
  • at least two folds are provided so that the electrochemical device 100 has a missing corner when viewed from the second direction Y, and the size of the missing corner can be changed according to actual needs, so that the shape of the electrochemical device 100 is consistent with the battery of the electronic device. While matching the actual shape of the compartment, the impact of a specific shape of the battery compartment on the energy density of the electrochemical device 100 is reduced.
  • the angled structure 70 formed by two folds can also reduce the possibility that the transition area 1200 is flushed open and causes liquid leakage during mechanical abuse (such as falling, vibration, impact).
  • the first corner portion 71 in addition to the second corner portion 72 including a portion of the second partition 1202 , the first corner portion 71 also includes a portion of the second partition 1202 . That is, when the first folding portion 71 is formed by folding for the first time, part of the second partition 1202 in the transition area 1200 is folded toward the first end wall 111 . Therefore, after the first folding, the size of the first sealing portion 121 in the third direction Z can be reduced, which is beneficial to further improving the energy density. At this time, as shown in FIG. 9 , the first corner line 73 intersects the edge 1202a of the second partition 1202 at the fourth intersection point 7311. Referring to FIGS.
  • the third intersection point 741 when viewed from the second direction Y, in the third direction Z, the third intersection point 741 is closer to the first adhesive member 50 than the fourth intersection point 7311 .
  • the second area 1221 in the transition area 1200 is not folded during the first folding process to form the first corner portion 71 .
  • the first corner portion 71 when folding for the first time to form the first corner portion 71 , part of the third partition 1203 in the transition area 1200 may also be folded. Therefore, the first corner portion 71 may further include a portion of the third partition 1203 . Since the distance between the third partition 1203 and the first end wall 111 will decrease in the third direction Z after folding, it can be understood that the third partition 1203 is also folded toward the first end wall 111 .
  • the second corner line 74 intersects the first corner line 73 at a second intersection point 740 .
  • the first corner line 73 includes a first section 731 and a second section 732.
  • the dividing point between the first section 731 and the second section 732 is the above-mentioned second intersection point 740.
  • the first section 731 is provided on the first corner portion 71 .
  • the second section 732 and the second corner line 74 are provided on the second corner portion 72 .
  • the second section 732 and the second corner line 74 are actually two sides of the second corner portion 72 .
  • the first flanging portion 122 includes a first side 122a and a second side 122b oppositely arranged in the second direction Y, and the second side 122b connects the first side 122a and the second side 122b .
  • Side walls 113 As shown in FIG. 6 , before folding to form the first hem portion 122 , the first side 122 a and the second side 122 b are oppositely arranged in the third direction Z. As shown in FIGS. 1 and 2 , after the first flange portion 122 is formed, the first side 122 a and the second side 122 b may substantially overlap when viewed from the second direction Y.
  • both the first side 122a and the second side 122b have a certain thickness in the third direction Z.
  • the first section 731 intersects the first side 122a at the first intersection point 7310 (specifically, the intersection point of the first section 731 and the outer edge of the first side 122a).
  • the intersection point of the second corner line 74 and the first section 731 is the first intersection point 7310.
  • Second intersection point 740 when viewed from the second direction Y, the first intersection point 7310 and the second intersection point 740 do not coincide. In this way, the possibility of the packaging bag 10 breaking at the overlapping intersection points and causing liquid leakage can be reduced, and the production efficiency can be easily improved.
  • the second intersection point 740 is located above the first intersection point 7310.
  • the first section 731 and the second folding line 74 may also overlap.
  • the second intersection point 740 of the second corner line 74 and the first section 731 is also the intersection point of the second corner line 74 and the first side 122a.
  • the angle between the first section 731 and the third direction Z is defined as ⁇ . If the angle ⁇ is too small, the folding area A formed during the first folding may be closer to the first conductive plate 30 , and the first conductive plate 30 may even be bent during the first folding. Therefore, 70° ⁇ 90° can be set, which facilitates the implementation of subsequent folding and improves the effect of subsequent folding. It is also conducive to reducing the distance between the folding area A formed during the first folding and the first conductive plate 30. There is even a possibility that the first conductive plate 30 is bent during the first folding.
  • the angle between the second folding line 74 and the third direction Z is defined as ⁇ , ⁇ .
  • the second corner portion 72 when viewed from the second direction Y, at least partially covers the first corner portion 71 . Since the folding angle of the second corner portion 72 is relatively large, the possibility of the second corner portion 72 opening compared with the first corner portion 71 can be reduced to a certain extent, which is also beneficial to increasing the energy density of the electrochemical device 100 .
  • the first corner portion 71 and the second corner portion 72 can be bonded.
  • a fourth adhesive member (not shown) may be provided between the first corner portion 71 and the second corner portion 72 .
  • the fourth adhesive member may be double-sided tape or hot melt adhesive.
  • the material of the adhesive layer in the double-sided tape can be selected from one or more of acrylate, polyurethane, rubber and silicone.
  • the hot melt adhesive can be selected from polyolefin hot melt adhesive, polyurethane hot melt adhesive, ethylene and other materials. This application is not limited to one or more of copolymer hot melt adhesives, polyester hot melt adhesives, polyamide hot melt adhesives, styrene and its block copolymer hot melt adhesives.
  • first sealing portion 121 and the second flanging portion 123 intersect in another transition area (not marked in the figure).
  • the transition region can also be folded at least twice toward the first end wall 111 to form another angled structure 80 (see FIG. 1 ), thereby further increasing the energy density of the electrochemical device 100 .
  • the formation method and specific structure of the corner structure 80 are similar to the corner structure 70 , and will not be described again here.
  • FIG. 10 another embodiment of the present application further provides an electrochemical device 200 .
  • the first folded edge portion 122 is a double folded edge structure formed by folding twice.
  • FIG. 6 shows the structure of the first flange portion 122 before folding.
  • the plane where the first flange portion 122 is located extends in the first direction X and the third direction Z.
  • FIG. 7 and 10 respectively show the structure of the first folding portion 122 after the first folding and the second folding.
  • the partial sealing portion 12 connected to the first side wall 113 is folded toward the first side wall 113 for the first time, and then, as shown in FIG.
  • the first folding portion 122 is formed by secondary folding, thereby protecting the exposed metal layer at the edge of the first folding portion 122 , reducing the risk of the exposed metal layer being easily short-circuited to the outside world, and improving safety.
  • yet another embodiment of the present application further provides an electrochemical device 300 .
  • the electrochemical device 300 also includes a circuit board 90 , and the circuit board 90 is electrically connected to the first conductive plate 30 and the second conductive plate 40 .
  • the circuit board 90 is used to realize electrical protection of the electrode assembly 20, such as charge and discharge protection, and to detect overvoltage, undervoltage, overcurrent, short circuit, and overtemperature status of the electrode assembly 20, thereby achieving protection and prolonging the electrochemical process.
  • the purpose of the device is 300 lifespan.
  • the first sealing part 121 and the first end wall 111 jointly form an accommodation space S2, and the circuit board 90 is disposed in the accommodation space S2.
  • the circuit board 90 can be folded to the first sealing portion 121 side and placed in the accommodation space S2 . Therefore, the influence on the energy density of the electrochemical device 100 due to the provision of the circuit board 90 can be reduced.
  • the electrochemical devices 100, 200, and 300 of the present application include all devices capable of generating electrochemical reactions.
  • the electrochemical devices 100, 200, and 300 include all types of primary batteries, secondary batteries, fuel cells, solar cells, and capacitors (eg, supercapacitors).
  • the electrochemical devices 100, 200, and 300 may be lithium secondary batteries, including lithium metal secondary batteries, lithium ion secondary batteries, lithium polymer secondary batteries, and lithium ion polymer secondary batteries.
  • the electronic device 1 includes an electrochemical device 300 (or electrochemical devices 100, 200) and a battery for accommodating the electrochemical device 300.
  • the battery compartment 2 is curved. Since at least two folds are provided, the shape of the corners of the electrochemical device 300 can be adjusted according to actual needs. Therefore, the shape of the electrochemical device 300 can match the actual shape of the battery compartment 2 .
  • the transition area of the electrochemical device is not folded or has only been folded once, in order to adapt to the arc-shaped inner wall of this type of battery compartment 2, the dimensions of the electrochemical device 100 in the first direction X and the third direction Z need to be correspondingly reduced. , thus reducing the energy density.
  • This application also reduces the impact of a specific shape of the battery compartment 2 on the energy density of the electrochemical device 100 by arranging at least two folds.
  • the electrochemical device 100 of the present application is suitable for electronic devices in various fields.
  • the electronic device 1 of the present application may be, but is not limited to, a notebook computer, a pen input computer, a mobile computer, an e-book player, a portable telephone, a portable fax machine, a portable copier, a portable printer, a head-mounted Stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini discs, transceivers, electronic notepads, calculators, memory cards, portable recorders, radios, backup power supplies, motors, cars, motorcycles, power-assisted bicycles , bicycles, lighting equipment, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries and lithium-ion capacitors, etc.
  • FIG. 14 another embodiment of the present application also provides a method for preparing the above electrochemical device 100 .
  • the order of steps of the preparation method can be changed, and some steps can be omitted or combined.
  • the preparation method includes the following steps:
  • Step S1 prepare the electrode assembly 20, and electrically connect the electrode assembly 20 to the first conductive plate 30 and the second conductive plate 40 respectively.
  • step S2 the electrode assembly 20 with the first conductive plate 30 and the second conductive plate 40 is put into the packaging bag 10 and sealed to form a sealing part 12 . Moreover, the first conductive plate 30 and the second conductive plate 40 extend out of the packaging bag 10 from the first sealing part 121 .
  • Step S3 Fold the sealing part 12 to the first flanging part 122 on the first side wall 113.
  • Step S4 Fold the transition area 1200 toward the first end wall 111 for the first time.
  • step S5 the transition region 1200 is folded toward the first end wall 111 for a second time, thereby forming the angled structure 70 .

Abstract

一种电化学装置，包括包装袋、电极组件和导电板。包装袋包括主体部和密封部。电极组件设置于主体部内，导电板电连接电极组件。主体部包括在第一方向上相对设置的第一端壁和第二端壁，还包括在第三方向上相对设置的第一侧壁和第二侧壁。密封部包括第一密封部和第一折边部。第一密封部连接第一端壁，导电板从第一密封部伸出包装袋。第一折边部连接第一侧壁，第一折边部和第一侧壁在第三方向上相对设置。第一密封部和第一折边部相交于过渡区内。电化学装置设置有折角结构，折角结构为形成第一折边部后将过渡区朝向第一端壁至少两次折叠形成。本申请还提供一种电化学装置的制备方法及电子装置。本申请可以提高能量密度。

Description

电化学装置及其制备方法、电子装置 技术领域
本申请涉及储能技术领域，尤其涉及一种电化学装置及其制备方法，以及具有该电化学装置的电子装置。
背景技术
电化学装置(如电池)在电子移动设备、电动工具及电动汽车等电子产品中有着广泛使用。在电化学装置的制备过程中，需要通过封头对上下层的封装膜进行热封以形成封边，从而将电极组件封装在壳体内。然而，封边可能会影响电化学装置的能量密度。
发明内容
鉴于现有技术存在的不足，有必要提出一种可提高能量密度的电化学装置及其制备方法。
另，还有必要提供一种具有该电化学装置的电子装置。
本申请提供一种电化学装置，包括包装袋、电极组件和导电板。包装袋包括主体部和密封部。电极组件设置于主体部内，导电板电连接电极组件。定义导电板凸出于电极组件的方向为第一方向，电极组件的厚度方向为第二方向，垂直于第一方向和第二方向的方向为第三方向。主体部包括在第一方向上相对设置的第一端壁和第二端壁，还包括在第三方向上相对设置的第一侧壁和第二侧壁。密封部包括第一密封部和第一折边部。第一密封部连接第一端壁，导电板从第一密封部伸出包装袋。第一折边部连接第一侧壁，第一折边部和第一侧壁在第三方向上相对设置。第一密封部和第一折边部相交于过渡区内。电化学装置设置有折角结构，折角结构为过渡区朝向第一端壁至少两次折叠形成。
本申请通过将过渡区朝向第一端壁至少两次折叠，不仅减小了第一折边部在第一方向上的尺寸，而且还有利于减小第一密封部在第三方向上的尺寸，从而减小过渡区占用的空间，提高电化学装置的能量密度。其次，设置至少两次折叠，使得电化学装置在从第二方向观察时具有缺角，且缺角的大小可根据实际需求进行变更，从而使得电化学装置的外形与电子装置的电池仓的实际形状匹配的同时，减小了特定形状的电池仓对电化学装置能量密度的影响。再次，设置两次折叠形成的折角结构还可减小过渡区处在机械滥用时被冲开并导致漏液的可能性。
在一些可能的实现方式中，折角结构为形成第一折边部后将过渡区朝向第一端壁两次折叠形成。可以减小过渡区占用空间提高能量密度；可以降低折角结构对包装袋角位的强度的 影响，降低包装袋破损漏液的风险；可以提高生产效率。
在一些可能的实现方式中，折角结构包括第一折角部和第二折角部，第一折角部为第一次折叠形成，第二折角部为第二次折叠形成。从第二方向观察，第二折角部至少部分覆盖第一折角部。如此，可在一定程度上减小第二折角部相较于第一折角部张开的可能性，还有利于提高能量密度。
在一些可能的实现方式中，电化学装置包括第一折角线和第二折角线。第一折角线包括第一段和第二段。第一段设置于第一折角部上。第二段和第二折角线设置于第二折角部上。
在一些可能的实现方式中，从第三方向观察，第一折边部包括在第二方向上相对设置的第一边和第二边，第二边连接第一侧壁。第一段与第一边相交于第一交点，第二折角线与第一段相交于第二交点。从第二方向观察，第一交点与第二交点不重合。如此，可减小包装袋于重合的交点处破裂并导致漏液的可能性，也易于生产效率的提高。在一些可能的实现方式中，第一交点和第二交点重合，进一步提高能量密度。
在一些可能的实现方式中，从第二方向观察，第一段与第三方向之间的夹角为α，70°≤α＜90°。如此，易于后续折叠的实施以及可提高后续折叠的效果，也可减小第一次折叠时形成的折叠区与导电板距离较近甚至导电板在第一次折叠时被弯折的可能性。
在一些可能的实现方式中，从第二方向观察，第二折角线与第三方向之间的夹角为β，β<α。
在一些可能的实现方式中，第一折角部与第二折角部粘接，从而减小第二折角部相较于第一折角部张开的可能性。
在一些可能的实现方式中，第一密封部包括第一区和过渡区。第一区连接部分第一端壁。过渡区包括第一分区和第二分区，第二分区连接另一部分第一端壁。第一密封部和第一折边部相交于第一分区。第一折角部包括部分第二分区。因此经第一次折叠后，第一密封部在第三方向上的尺寸减小，从而有利于进一步提高能量密度。
在一些可能的实现方式中，电化学装置还包括电路板，电路板与导电板电连接。第一密封部和第一端壁共同形成容置空间，电路板设于容置空间内。如此，可减小由于设置电路板对电化学装置能量密度的影响。
在一些可能的实现方式中，第一折边部为单折边结构或双折边结构。双折边结构可减小包装袋的金属层露出后容易与外界短接的风险。
在一些可能的实现方式中，在第二方向上，包装袋的厚度为50μm至130μm。将包装袋的厚度设置在此范围内，可以满足设置折角结构后对包装袋强度的影响，满足安全性和寿命要求，也易于工艺中实现折角结构。
本申请还提供一种电子装置，包括电池仓及如上电化学装置。电化学装置设于电池 仓内。通过设置至少两次折叠，不仅减小了第一折边部在第一方向上的尺寸，而且还有利于减小第一密封部在第三方向上的尺寸，从而提高了电化学装置的能量密度。
在一些可能的实现方式中，电池仓为弧形。通过设置至少两次折叠，使得电化学装置在从第二方向观察时具有缺角，且缺角的大小可根据实际需求进行变更，从而使得电化学装置的外形与电子装置的电池仓的实际形状匹配的同时，同时，能极大减小特定形状的电池仓对电化学装置能量密度的影响。
本申请第三方面提供一种电化学装置的制备方法，包括如下步骤：制备电极组件，并将电极组件分别与第一导电板电连接；将带有第一导电板的电极组件装入包装袋中并进行封装，形成密封部，第一导电板从第一密封部伸出包装袋；将密封部折叠至与第一侧壁相对设置以形成第一折边部；将过渡区朝向第一端壁进行至少两次折叠，从而形成折角结构。在一些可能的实现方式中，将过渡区朝向第一端壁进行第一次折叠；以及将过渡区朝向第一端壁进行第二次折叠，从而形成折角结构。
附图说明
图1为本申请一实施方式提供的电化学装置的正视图。
图2为图1所示的电化学装置于II处的局部放大图。
图3为图1所示的电化学装置于封装前的示意图。
图4A为图1所示的电化学装置沿IVA-IVA的剖视图。
图4B为图1所示的电化学装置沿IVB-IVB的剖视图。
图4C为另一些实施例中图1所示的电化学装置沿IVA-IVA的剖视图。
图5为图1所示的电化学装置的包装膜的剖视图。
图6为图1所示的电化学装置在包装袋的第一折边部折叠前的正视图。
图7为图6所示的第一折边部经折叠后的正视图。
图8为图7所示的包装袋的过渡区经第一次折叠后的正视图。
图9为图8所示的电化学装置于IX处的局部放大图。
图10为本申请另一实施方式提供的电化学装置的剖视图。
图11为本申请再一实施方式提供的电化学装置的主视图。
图12为本申请又一实施方式提供的电子装置的结构示意图。
图13为图12所示的电子装置的内部结构示意图。
图14为本申请又一实施方式提供的电化学装置的制备方法的流程图。
主要元件符号说明
电子装置 1
电池仓 2
包装袋 10
第一封装膜 10a
第一膜区 10a1
第二膜区 10a2
第二封装膜 10b
第三膜区 10b1
第四膜区 10b2
主体部 11
密封部 12
电极组件 20
正极片 21
负极片 22
隔离膜 23
第一极耳 24
第一导电板 30
第二导电板 40
第一粘接件 50
第二粘接件 60
折角结构 70、80
第一折角部 71
第二折角部 72
第一折角线 73
第二折角线 74
电路板 90
第一保护层 101
第一金属层 102
第一聚合物层 103
第一端壁 111
第二端壁 112
第一侧壁 113
第二侧壁 114
第一密封部 121
第一折边部 122
第一边 122a
第二边 122b
第二折边部 123
电化学装置 100、200、300
第一段 731
第二段 732
第二交点 740
第三交点 741
过渡区 1200
第一分区 1201
第二分区 1202
第三分区 1203
第一区 1211
边缘 1202a
第三粘接件 1220
第二区 1221
第一交点 7310
第四交点 7311
第一方向 X
第二方向 Y
第三方向 Z
折叠区 A
第四分区 A1
第五分区 A2
厚度 T
夹角 α、β
凹部 S1
容置空间 S2
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面对本申请实施例中的技术方案进行清楚、详细地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。
下文，将详细地描述本申请的实施方式。但是，本申请可体现为许多不同的形式，并且不应解释为限于本文阐释的示例性实施方式。而是，提供这些示例性实施方式，从而使本申请透彻的和详细的向本领域技术人员传达。
另外，为了简洁和清楚，在附图中，各种组件、层的尺寸或厚度可被放大。遍及全文，相同的数值指相同的要素。如本文所使用，术语“及/或”、“以及/或者”包括一个或多个相关列举项目的任何和所有组合。另外，应当理解，当要素A被称为“连接”要素B时，要素A可直接连接至要素B，或可能存在中间要素C并且要素A和要素B可彼此间接连接。
进一步，当描述本申请的实施方式时使用“可”指“本申请的一个或多个实施方式”。
本文使用的专业术语是为了描述具体实施方式的目的并且不旨在限制本申请。如本文所使用，单数形式旨在也包括复数形式，除非上下文另外明确指出。应进一步理解，术语“包括”，当在本说明书中使用时，指存在叙述的特征、数值、步骤、操作、要素和/或组分，但是不排除存在或增加一个或多个其他特征、数值、步骤、操作、要素、组分和/或其组合。
空间相关术语，比如“上”等可在本文用于方便描述，以描述如图中阐释的一个要素或特征与另一要素(多个要素)或特征(多个特征)的关系。应理解，除了图中描述的方向之外，空间相关术语旨在包括设备或装置在使用或操作中的不同方向。例如，如果将图中的设备翻转，则描述为在其他要素或特征“上方”或“上”的要素将定向在其他要素或特征的“下方”或“下面”。因此，示例性术语“上”可包括上面和下面的方向。应理解，尽管术语第一、第二、第三等可在本文用于描述各种要素、组分、区域、层和/或部分，但是这些要素、组分、区域、层和/或部分不应受这些术语的限制。这些术语用于区分一个要素、组分、区域、层或部分与另一要素、组分、区域、层或部分。因此，下面讨论的第一要素、组分、区域、层或部分可称为第二要素、组分、区域、层或部分，而不背离示例性实施方式的教导。
请参阅图1至图4B，本申请一实施方式提供一种电化学装置100，包括包装袋10、电极组件20、第一导电板30和第二导电板40。电极组件20位于包装袋10内。第一导电板30和第二导电板40均电连接电极组件20，并伸出包装袋10。第一导电板30和第二导电板40可以连接外部元件(图未示)。在一些实施例中，电极组件20可以为卷绕结构。具体地，如图4A和图4B所示，电极组件20包括正极片21、负极片22和隔离膜23。正极片21、隔离膜23和负极片22依次层叠卷绕。第一导电板30与正极片21电连接，第二导电板40与负极片 22电连接。其中，如图4A所示，电极组件20为多极耳结构，其还包括多个第一极耳24和多个第二极耳(图未示)。第一极耳24一端电连接于正极片21，另一端电连接于第一导电板30。第二极耳一端电连接于负极片22，另一端电连接于第二导电板40。在另一些实施例中，请参阅图4C，其与图4A所示的电极组件20的区别在于，电极组件20可以不包括第一极耳24和第二极耳。在另一些实施例中，电极组件20还可以为叠片结构，即正极片21、隔离膜23和负极片22依次层叠。
如图1和图3所示，包装袋10包括主体部11和密封部12。电极组件20设置于主体部11内。定义第一导电板30或第二导电板40凸出于电极组件20的方向(即从电极组件20至第一导电板30或第二导电板40的方向)为第一方向X，电极组件20的厚度方向为第二方向Y，垂直于第一方向X和第二方向Y的方向为第三方向Z。第二方向Y也为垂直于第一导电板30或第二导电板40表面的方向。第三方向Z也为从第一导电板30至第二导电板40的方向。
图3为电化学装置100在封装前的结构示意图。包装袋10包括在第二方向Y上相对设置的第一封装膜10a和第二封装膜10b，且包装袋10由第一封装膜10a和第二封装膜10b封装而成。在一些实施例中，第一封装膜10a和第二封装膜10b可由同一张封装膜折叠后得到，且第一封装膜10a和第二封装膜10b的折叠处对应电极组件20远离第一导电板30和第二导电板40的尾部。第一封装膜10a包括相互连接的第一膜区10a1和第二膜区10a2。第二膜区10a2的三个侧边被第一膜区10a1包围。第二封装膜10b包括相互连接的第三膜区10b1和第四膜区10b2。第四膜区10b2的三个侧边被第三膜区10b1包围。第一封装膜10a的第二膜区10a2设有凹部S1。第二膜区10a2和第四膜区10b2共同组成用于收容电极组件20的主体部11。请一并参阅图3和图4A，制备包装袋10时，可利用封装设备的封头同时在第一膜区10a1与第三膜区10b1施加一定的温度和压力，第一膜区10a1与第三膜区10b1相连接以形成密封部12，从而在第一方向X上封闭用于容置电极组件20的主体部11，减小漏液风险。
第一封装膜10a和第二封装膜10b的材料均为多层片材。如图5所示，第一封装膜10a可包括依次层叠设置的第一保护层101、第一金属层102和第一聚合物层103。相较于第一保护层101，第一聚合物层103更靠近电极组件20。第一保护层101的材质可以为高分子树脂，其可以用于保护第一金属层102，降低第一金属层102因外力作用破损的风险，同时能够延缓外部环境的空气渗透，维持电化学装置100内部处于正常运作的环境。在一些实施例中，第一保护层101的材质可选自对苯二甲酸乙二醇酯、聚对苯二甲酸丁二醇酯、聚偏氟乙烯、聚四氟乙烯、聚丙烯、聚酰胺、聚酰亚胺中的至少一种。第一金属层102可以用于延缓外部环境的水分渗透，并减少外力对电极组件20造成的损伤。在一些实施例中，第一金属层102可以为铝箔层或钢箔层。第一聚合物层103具有加热熔融的性质，可以用于封装，且可以降低多层片材被电解液中的有机溶剂溶解或溶胀的风险。第一聚合物层103还可用于降低电解 液中的电解质与第一金属层102接触而导致金属层被腐蚀的风险。在一些实施例中，第一聚合物层103包括聚合物材料，其可选自聚丙烯、丙烯共聚物、聚乙烯、聚甲基丙烯酸甲酯中的至少一种聚合物材料。其中，第一保护层101和第一金属层102之间还可设有粘接层，其用于将第一保护层101和第一金属层102粘接在一起。第二封装膜10b可包括依次层叠设置的第二保护层(图未示)、第二金属层(图未示)和第二聚合物层(图未示)。可以理解，当第一封装膜10a和第二封装膜10b可由一张封装膜折叠后得到时，第二保护层、第二金属层和第二聚合物层的材质分别与第一保护层101、第一金属层102和第一聚合物层103的材质相同，在此不作重复描述。封装时，使第一聚合物层103和第二聚合物层相互熔融并粘合在一起。
在一些实施例中，在第二方向Y上，包装袋10的厚度T(参图4A)为50μm至130μm。此处，包装袋10的厚度指的是第一封装膜10a的厚度或第二封装膜10b的厚度。将厚度T设置在此范围内，可以满足设置折角结构70后对包装袋10强度的影响，满足安全性和寿命要求，也易于工艺中折叠实现折角结构70。在一些具体的实施例中，可设置第一保护层的厚度为15μm，第一金属层102的厚度为40μm，第一聚合物层103的厚度为30μm。
如图1和图4A所示，主体部11包括在第一方向X上相对设置的第一端壁111和第二端壁112。如图1和图4B所示，主体部11还包括在第三方向Z上相对设置的第一侧壁113和第二侧壁114。从第二方向Y观察，第一端壁111所在表面可在第二方向Y和第三方向Z上延伸，第二端壁112所在表面可在第二方向Y和第三方向Z上延伸。从第二方向Y观察，第一侧壁113连接于第一端壁111和第二端壁112之间，第二侧壁114连接于第一端壁111和第二端壁112之间。从第二方向Y观察，第一侧壁113所在表面可在第一方向X和第二方向Y上延伸，第二侧壁114所在表面可在第一方向X和第二方向Y上延伸。应当理解，在图4A中，虽然标号111指向第一导电板30的左侧，但是第一导电板30右侧的相应位置也为第一端壁111，第一端壁111的设置形式可以根据包装袋10的凹部的设置形式变化，例如可以第一封装膜10a和第二封装膜10b中的一个设置凹部，也可以第一封装膜10a和第二封装膜10b均设置凹部；在图4B中第一侧壁113和第二侧壁114也设置形式也可以根据包装袋10的凹部的设置形式变化。
密封部12包括第一密封部121和第一折边部122。第一密封部121连接第一端壁111，且第一导电板30和第二导电板40从第一密封部121伸出包装袋10。在一些实施例中，电化学装置100还包括第一粘接件50和第二粘接件60。第一粘接件50用于连接第一密封部121和第一导电板30，且部分第一粘接件50设于所述第一密封部121外。第二粘接件60用于连接第一密封部121和第二导电板40，且部分第二粘接件60设于第一密封部121外。
如图1和图4B所示，第一折边部122连接第一侧壁113，且第一折边部122和第一侧壁 113在第三方向Z上相对设置。在一些实施例中，第一折边部122为一次折叠后形成的单折边结构。即，连接于第一侧壁113的密封部12经过一次折叠后与第一侧壁113在第三方向Z上相对设置，形成第一折边部122。具体地，图6示出第一折边部122折叠前的结构，此时第一折边部122所在平面在第一方向X和第三方向Z上延伸。图4B和图7示出第一折边部122折叠后的结构。第一折边部122经一次折叠后与第一侧壁113在第三方向Z上相对设置，从而减小电化学装置100在第三方向Z上的尺寸，提高空间利用率和能量密度。在一些实施例中，为了减小第一折边部122相较于第一侧壁113张开的可能性，可将第一折边部122和第一侧壁113粘接。具体地，可在第一折边部122和第一侧壁113之间设置第三粘接件1220。其中，第三粘接件1220可以为双面胶或者热熔胶。双面胶中粘结层的材质可以选自丙烯酸酯、聚氨酯、橡胶及硅胶中的一种或多种，热熔胶可以选自聚烯烃类热熔胶、聚氨酯类热熔胶、乙烯及其共聚物类热熔胶、聚酯类热熔胶、聚酰胺类热熔胶、苯乙烯及其嵌段共聚物类热熔胶中的一种或几种，本申请并不作限制。
如图1、图4B和图7所示，在一些实施例中，密封部12还可包括第二折边部123。第二折边部123连接第二侧壁114，且第二折边部123和第二侧壁114在第三方向Z上相对设置。在一些实施例中，第二折边部123也为一次折叠后形成的单折边结构，即与第二侧壁114连接的部分密封部12经一次折叠后与第二侧壁114相对设置以形成第二折边部123，从而进一步减小电化学装置100在第三方向Z上的尺寸，提高空间利用率和能量密度。
如图6所示，第一密封部121包括在第三方向Z上依次设置的过渡区1200和第一区1211，第一区1211连接部分第一端壁111。过渡区1200包括第一分区1201和第二分区1202，第二分区1202连接另一部分第一端壁111。第一折边部122包括在第一方向X上依次设置的第二区1221和上述第一分区1201，第二区1221连接第一侧壁113。即，第一密封部121和第一折边部122相交于第一分区1201。即，第一密封部121和第一折边部122相交于过渡区1200内。在一些实施例中，过渡区1200还可包括第三分区1203，第三分区1203连接部分第一侧壁113，第二区1221连接另一部分第一侧壁113。
如图1和图2所示，电化学装置100还设有折角结构70。折角结构70为形成第一折边部122后(即，将连接第一侧壁113的部分密封部12折叠至与第一侧壁113相对设置形成第一折边部122后)，将过渡区1200朝向第一端壁111两次折叠形成。具体地，图6示出过渡区1200折叠前的结构，此时过渡区1200所在平面在第一方向X和第二方向Y上延伸。图7示出形成第一折边部122后的结构，可以理解，在形成第一折边部122的过程中，第二分区1202可以未被折叠。在形成第一折边部122后，如图8和图9所示，先将过渡区1200绕第一折角线73(在图9)朝向第一端壁111进行第一次折叠，形成第一折角部71。然后，再将过渡区1200绕第二折角线74朝向第一端壁111进行第二次折叠，形成如图2所示的第二折角部72。
如图9和图2所示，在一些实施例中，在第二次折叠形成第二折角部72时，过渡区1200中的部分第二分区1202朝向第一端壁111被折叠，使得图2形成的第二折角部72包括部分第二分区1202，此时，第二折角线74与第二分区1202的边缘1202a相交于第三交点741。因此相较于一次折叠过渡区1200，两次折叠可有利于减小第一密封部121在第三方向Z上的尺寸。而且，第二次折叠可使得电化学装置100从第二方向Y观察时具有缺角，且缺角的大小根据实际需求进行变更，因此使得电化学装置100的外形可根据电子装置的电池仓的实际形状适应性调整。请结合参照图1和图2，在一些实施例中，在第三方向Z上，第三交点741与第一粘接件50远离第二粘接件60的侧边相距设置。
在一些实施例中，在第二次折叠后，再折叠过渡区1200至少一次，进一步调整折角结构70，以提高能量密度。
如图9所示，定义第一次朝向第一端壁111折叠的折叠区为A，折叠区A分为第四分区A1和第五分区A2。结合参照图2，第四分区A1会继续在第二次折叠后形成第二折角部72的一部分，因此，上述第一折角部71指的是：第一次朝向第一端壁111折叠，但后续未进行第二次折叠的区域。即，第一折角部71指的是第五分区A2。
本申请通过将过渡区1200朝向第一端壁111至少两次折叠，不仅减小了第一折边部122在第一方向X上的尺寸，而且还有利于减小第一密封部121在第三方向Z上的尺寸，从而减小过渡区1200占用的空间，提高电化学装置100的能量密度。其次，设置至少两次折叠，使得电化学装置100在从第二方向Y观察时具有缺角，且缺角的大小可根据实际需求进行变更，从而使得电化学装置100的外形与电子装置的电池仓的实际形状匹配的同时，减小了特定形状的电池仓对电化学装置100能量密度的影响。再次，设置两次折叠形成的折角结构70还可减小过渡区1200处在机械滥用时(如跌落、振动、撞击)被冲开并导致漏液的可能性。
如图8和图9所示，在一些实施例中，除第二折角部72包括部分第二分区1202之外，第一折角部71也包括部分第二分区1202。即，在第一次折叠形成第一折角部71时，过渡区1200中的部分第二分区1202朝向第一端壁111被折叠。因此经第一次折叠后，第一密封部121在第三方向Z上的尺寸便可减小，从而有利于进一步提高能量密度。此时，如图9所示，第一折角线73与第二分区1202的边缘1202a相交于第四交点7311。结合参照图8和图9，从第二方向Y观察，在第三方向Z上，第三交点741相较于第四交点7311更靠近第一粘接件50。在另一实施例中，过渡区1200中的第二区1221在第一次折叠形成第一折角部71的过程中未被折叠。
如图8和图9所示，在一些实施例中，在第一次折叠形成第一折角部71时，还可将过渡区1200中的部分第三分区1203进行折叠。因此，第一折角部71还可进一步包括部分第三分区1203。由于折叠后，在第三方向Z上，该部分第三分区1203与第一端壁111之间的距离会减小，因此可以理解为该部分第三分区1203也是朝向第一端壁111折 叠。
如图2所示，在一些实施例中，第二折角线74与第一折角线73相交于第二交点740。第一折角线73包括第一段731和第二段732，第一段731和第二段732的分界点即为上述第二交点740。第一段731设置于第一折角部71上。第二段732和第二折角线74设置于第二折角部72上，第二段732和第二折角线74实际上为第二折角部72的两条边。
结合参照图1和图2，其中，从第三方向Z观察，第一折边部122包括在第二方向Y上相对设置的第一边122a和第二边122b，第二边122b连接第一侧壁113。如图6所示，在折叠形成第一折边部122之前，第一边122a和第二边122b在第三方向Z上相对设置。如图1和图2所示，在形成第一折边部122后，从第二方向Y观察，第一边122a和第二边122b可大体重合。而且由于包装袋10具有一定厚度，因此从第三方向Z观察，第一边122a和第二边122b均在第三方向Z上具有一定的厚度。第一段731与第一边122a相交于第一交点7310(具体为，第一段731与第一边122a的外边缘的交点)，第二折角线74与第一段731的交点即为第二交点740。在一些实施例中，从第二方向Y观察时，第一交点7310与第二交点740不重合。如此，可减小包装袋10于重合的交点处破裂并导致漏液的可能性，也易于生产效率的提高。更具体地，在第二方向Y上，第二交点740位于第一交点7310上方。在另一些实施例中，从第二方向Y观察时，第一段731与第二折角线74也可以重合。此时，第二折角线74与第一段731的第二交点740，也为第二折角线74与第一边122a的交点。
如图2和图9所示，在一些实施例中，从第二方向Y观察，定义第一段731与第三方向Z之间的夹角为α。若夹角α过小，则第一次折叠时形成的折叠区A可能会第一导电板30距离较近，甚至第一导电板30可能会在第一折叠时被弯折。因此，可设置70°≤α＜90°，从而易于后续折叠的实施以及可提高后续折叠的效果，也有利于减小第一次折叠时形成的折叠区A与第一导电板30距离较近甚至第一导电板30在第一折叠时被弯折的可能性。
进一步地，从第二方向Y观察，定义第二折角线74与第三方向Z之间的夹角为β，β<α。
如图2所示，在一些实施例中，从第二方向Y观察，第二折角部72至少部分覆盖第一折角部71。由于第二折角部72折叠角度较大，因此可在一定程度上减小第二折角部72相较于第一折角部71张开的可能性，还有利于提高电化学装置100的能量密度。
在一些实施例中，为了进一步减小第二折角部72相较于第一折角部71张开的可能性，可将第一折角部71与第二折角部72粘接。具体地，可在第一折角部71与第二折角部72之间设置第四粘接件(图未示)。其中，第四粘接件可以为双面胶或者热熔胶。双面胶中粘结层的材质可以选自丙烯酸酯、聚氨酯、橡胶及硅胶中的一种或多种，热熔胶可以选自聚烯烃类热熔胶、聚氨酯类热熔胶、乙烯及其共聚物类热熔胶、聚酯类热熔 胶、聚酰胺类热熔胶、苯乙烯及其嵌段共聚物类热熔胶中的一种或几种，本申请并不作限制。
可以理解，在一些实施例中，第一密封部121与第二折边部123相交于另一过渡区(图未标出)内。该过渡区也可以朝向第一端壁111至少两次折叠形成另一折角结构80(参图1)，从而进一步提高电化学装置100的能量密度。其中，折角结构80的形成方式与具体结构与折角结构70相似，在此不作重复描述。
在一些实施例中，请参阅图10，本申请另一实施方式还提供一种电化学装置200。与上述电化学装置200不同之处在于，第一折边部122为经两次折叠后形成的双折边结构。具体地，图6示出第一折边部122折叠前的结构，此时第一折边部122所在平面在第一方向X和第三方向Z上延伸。图7和图10分别示出第一折边部122经第一次折叠和第二次折叠后的结构。例如，如图7所示，先将与第一侧壁113连接的部分密封部12第一次朝向第一侧壁113折叠，然后，如图10所示，再将部分密封部12经第二次折叠形成第一折边部122，从而将第一折边部122边缘裸露的金属层保护起来，减小金属层露出后容易与外界短接的风险，提高安全性。
请参阅图11，本申请再一实施方式还提供一种电化学装置300。与上述电化学装置100不同之处在于，电化学装置300还包括电路板90，电路板90与第一导电板30及第二导电板40电连接。其中，电路板90用于实现对电极组件20的电保护，如充放电保护，并对电极组件20过压、欠压、过流、短路、过温状态进行检测，从而达到保护以及延长电化学装置300使用寿命的目的。第一密封部121和第一端壁111共同形成容置空间S2，电路板90设于容置空间S2内。制备时，可将电路板90在连接第一导电板30和第二导电板40后，翻折至第一密封部121一侧，并容置于容置空间S2内。因此，可减小由于设置电路板90对电化学装置100能量密度的影响。
其中，本申请的电化学装置100、200、300包括所有能够发生电化学反应的装置。具体的，电化学装置100、200、300包括所有种类的原电池、二次电池、燃料电池、太阳能电池和电容器(例如超级电容器)。可选地，电化学装置100、200、300可以为锂二次电池，包括锂金属二次电池、锂离子二次电池、锂聚合物二次电池和锂离子聚合物二次电池。
请参阅图12和图13，本申请又一实施方式还提供一种电子装置1，电子装置1包括电化学装置300(或电化学装置100、200)及用于容置电化学装置300的电池仓2。在一些实施例中，电池仓2为弧形。由于设置至少两次折叠，使得电化学装置300边角处的外形可以根据实际需求调整，因此，电化学装置300的外形可与电池仓2的实际形状匹配。同时，若电化学装置的过渡区未折叠或仅经过一次折叠，为了适应该类电池仓2弧形的内壁，则电化学装置100在第一方向X和第三方向Z的尺寸需要对应减小，从 而降低了能量密度。本申请通过设置至少两次折叠，还减小了特定形状的电池仓2对电化学装置100能量密度的影响。
其中，本申请的电化学装置100适用于各种领域的电子装置。在一实施方式中，本申请的电子装置1可以是，但不限于笔记本电脑、笔输入型计算机、移动电脑、电子书播放器、便携式电话、便携式传真机、便携式复印机、便携式打印机、头戴式立体声耳机、录像机、液晶电视、手提式清洁器、便携CD机、迷你光盘、收发机、电子记事本、计算器、存储卡、便携式录音机、收音机、备用电源、电机、汽车、摩托车、助力自行车、自行车、照明器具、玩具、游戏机、钟表、电动工具、闪光灯、照相机、家庭用大型蓄电池和锂离子电容器等。
请参阅图14，本申请又一实施方式还提供了上述电化学装置100的制备方法。根据不同需求，所述制备方法的步骤顺序可以改变，某些步骤可以省略或合并。该制备方法包括如下步骤：
步骤S1，制备电极组件20，并将电极组件20分别与第一导电板30及第二导电板40电连接。
步骤S2，将带有第一导电板30及第二导电板40的电极组件20装入包装袋10中并进行封装，形成密封部12。且，第一导电板30及第二导电板40从第一密封部121伸出包装袋10。
步骤S3，将密封部12折叠至第一侧壁113上第一折边部122。
步骤S4，将过渡区1200朝向第一端壁111进行第一次折叠。
步骤S5，将过渡区1200朝向第一端壁111进行第二次折叠，从而形成折角结构70。
最后应说明的是，以上实施例仅用以说明本申请的技术方案而非限制，尽管参照较佳实施例对本申请进行了详细说明，本领域的普通技术人员应当理解，可以对本申请的技术方案进行修改或等同替换，而不脱离本申请技术方案的范围。

Claims (15)

  1. 一种电化学装置，包括包装袋、电极组件和导电板，所述包装袋包括主体部和密封部，所述电极组件设置于所述主体部内，所述导电板电连接所述电极组件；
    定义所述导电板凸出于所述电极组件的方向为第一方向，所述电极组件的厚度方向为第二方向，垂直于所述第一方向和所述第二方向的方向为第三方向，所述主体部包括在所述第一方向上相对设置的第一端壁和第二端壁，还包括在所述第三方向上相对设置的第一侧壁和第二侧壁；其中，
    所述密封部包括第一密封部和第一折边部，所述第一密封部连接所述第一端壁，所述导电板从所述第一密封部伸出所述包装袋；所述第一折边部连接所述第一侧壁，所述第一折边部和所述第一侧壁在所述第三方向上相对设置；所述第一密封部和所述第一折边部相交于过渡区内；
    所述电化学装置设置有折角结构，所述折角结构为所述过渡区朝向所述第一端壁至少两次折叠形成。
  2. 如权利要求1所述的电化学装置，其中，所述折角结构为形成所述第一折边部后将所述过渡区朝向所述第一端壁两次折叠形成。
  3. 如权利要求1或2所述的电化学装置，其中，所述折角结构包括第一折角部和第二折角部，所述第一折角部为第一次折叠形成，所述第二折角部为第二次折叠形成，从所述第二方向观察，所述第二折角部至少部分覆盖所述第一折角部。
  4. 如权利要求3所述的电化学装置，其中，所述电化学装置包括第一折角线和第二折角线，所述第一折角线包括第一段和第二段，所述第一段设置于所述第一折角部上，所述第二段和所述第二折角线设置于所述第二折角部上。
  5. 如权利要求4所述的电化学装置，其中，从所述第三方向观察，所述第一折边部包括在所述第二方向上相对设置的第一边和第二边；
    所述第二边连接所述第一侧壁，所述第一段与所述第一边相交于第一交点，所述第二折角线与所述第一段相交于第二交点；从所述第二方向观察，所述第一交点与所述第二交点不重合。
  6. 如权利要求4所述的电化学装置，其中，从所述第二方向观察，所述第一段与所述第三方向之间的夹角为α，70°≤α＜90°。
  7. 如权利要求6所述的电化学装置，其中，从所述第二方向观察，所述第二折角线与所述第三方向之间的夹角为β，β<α。
  8. 如权利要求3所述的电化学装置，其中，所述第一折角部与所述第二折角部粘接。
  9. 如权利要求1所述的电化学装置，其中，所述第一密封部包括相互连接的第一区和所述过渡区，所述第一区连接部分所述第一端壁，所述过渡区包括相互连接的第一分区和第二分区，所述第二分区连接另一部分所述第一端壁和所述第一区，所述第一密封部和所述第一折边部相交于所述第一分区；所述第一折角部包括部分所述第二分区。
  10. 如权利要求1所述的电化学装置，其中，所述电化学装置还包括电路板，所述电路板与所述导电板电连接；所述第一密封部和所述第一端壁共同形成容置空间，所述电路板设于所述容置空间内。
  11. 如权利要求1所述的电化学装置，其中，所述第一折边部为单折边结构或双折边结构。
  12. 如权利要求1所述的电化学装置，其中，在所述第二方向上，所述包装袋的厚度为50μm至130μm。
  13. 一种电子装置，包括电池仓，其中，所述电子装置还包括如权利要求1至12中任一项所述的电化学装置，所述电化学装置设于所述电池仓内。
  14. 如权利要求13所述的电子装置，其中，所述电池仓为弧形。
  15. 一种如权利要求1至12中任一项所述的电化学装置的制备方法，其中，所述制备方法包括如下步骤：
    制备所述电极组件，并将所述电极组件与所述第一导电板电连接；
    将带有所述第一导电板的所述电极组件装入所述包装袋中并进行封装，形成所述密封部，所述第一导电板从所述第一密封部伸出所述包装袋；
    将所述密封部折叠至与所述第一侧壁在所述第三方向上相对设置以形成所述第一折边部；
    将所述过渡区朝向所述第一端壁进行至少二次折叠，从而形成所述折角结构。
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CN114614169A (zh) * 2022-03-30 2022-06-10 东莞新能源科技有限公司 电化学装置及其制备方法、电子装置

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