WO2021195906A1 - 电化学装置及采用该电化学装置的电子装置 - Google Patents

电化学装置及采用该电化学装置的电子装置 Download PDF

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Publication number
WO2021195906A1
WO2021195906A1 PCT/CN2020/082249 CN2020082249W WO2021195906A1 WO 2021195906 A1 WO2021195906 A1 WO 2021195906A1 CN 2020082249 W CN2020082249 W CN 2020082249W WO 2021195906 A1 WO2021195906 A1 WO 2021195906A1
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WO
WIPO (PCT)
Prior art keywords
adhesive member
electrochemical device
current collector
straight section
section
Prior art date
Application number
PCT/CN2020/082249
Other languages
English (en)
French (fr)
Inventor
韩翔龙
李学成
Original Assignee
东莞新能安科技有限公司
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 东莞新能安科技有限公司 filed Critical 东莞新能安科技有限公司
Priority to EP20928190.6A priority Critical patent/EP4131557A4/en
Priority to PCT/CN2020/082249 priority patent/WO2021195906A1/zh
Priority to CN202080008295.0A priority patent/CN113614978B/zh
Publication of WO2021195906A1 publication Critical patent/WO2021195906A1/zh
Priority to US17/957,198 priority patent/US20230025766A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/417—Polyolefins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • 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

  • This application relates to the field of energy storage technology, in particular to an electrochemical device and an electronic device using the electrochemical device.
  • a diaphragm is used as a finishing touch during the manufacturing process of the electrode assembly.
  • the electrochemical device is easily damaged under mechanical abuse (such as drop, impact, collision, etc.), which causes the electrochemical device to easily fail, increase the safety risk, and reduce the service life.
  • the application provides an electrochemical device, which includes an electrode assembly, a first adhesive member and a second adhesive member.
  • the electrode assembly includes a pole piece and a diaphragm.
  • the pole piece and the diaphragm are sequentially stacked and wound to form an electrode assembly.
  • the pole piece includes a current collector.
  • the electrode assembly includes a first straight section and a first bent section that are connected to each other. Wherein, along the winding direction, the end of the diaphragm exceeds the end of the current collector by 1 to 5 turns, the first adhesive member is provided on the outer surface of the first straight section, and the second adhesive member is provided on the first bending section.
  • the diaphragm is finished by 1 to 5 turns, so that the diaphragm forms a protective layer, which effectively increases the mechanical impact resistance of the outer diaphragm, and collects fluid on the outer surface of the first bending section or the outermost ring in the first bending section.
  • the second adhesive part is arranged on the outer surface of the tube, so that the end diaphragm at the first bending section can be prevented from being damaged.
  • the first adhesive member is provided on the outer surface of the first straight section, which can improve the strength of the finishing diaphragm in the vertical winding direction at the first straight section. This improves the safety and service life of the electrochemical device.
  • the second adhesive member is provided on the outer surface of the first bending section, the second adhesive member includes a first extension, and the first extension is provided on the outer surface of the first straight section.
  • the second adhesive member is provided on the outer surface of the outermost current collector in the first bending section
  • the first extension is provided on the outer surface of the outermost current collector in the first straight section.
  • the width W 1 of the first extension satisfies 0 mm ⁇ W 1 ⁇ 5 mm. This arrangement can ensure that the first extension has a certain width to protect the corners of the end diaphragm from damage, and it can also prevent the width of the first extension from greatly increasing the thickness of the first straight section, resulting in a decrease in energy density.
  • the electrode assembly further includes a second straight section, the second straight section is connected to the first bent section, and the second adhesive member further includes a second extension portion, the second extension portion is disposed on the second The outer surface of the straight section.
  • the second extension part by providing the second extension part, it is possible to further protect the corner position of the end diaphragm, and to improve the end diaphragm at the junction of the first bending section and the second straight section. It is easy to damage the electrochemical device under the condition of mechanical abuse. The problem of failure further improves safety, reliability and service life.
  • the second extension portion is provided on the outer surface of the outermost current collector in the second straight section.
  • the electrochemical device further includes a third adhesive member
  • the electrode assembly further includes a second bending section. Both ends of the second bending section are connected to the first horizontal section and the second horizontal section respectively.
  • the three bonding parts are arranged on the outer surface of the second bending section or the outer surface of the outermost ring current collector in the second bending section.
  • a third adhesive member is provided on the outer surface of the second bending section or the outer surface of the outermost ring current collector in the second bending section, so as to avoid damage to the end diaphragm at the second bending section. Circumstances, to further improve the safety and service life of the electrochemical device.
  • the winding direction, the width W of the first adhesive member 2 satisfies 5mm ⁇ W 2 ⁇ 50mm. If the width of the first adhesive part is too small, in the winding direction, it is impossible to avoid the damage of the end diaphragm due to mechanical abuse. If the width of the first adhesive part is too large, it will affect the thickness of the electrode assembly and reduce the energy density .
  • the width W 3 of the separator and the length L 2 of the first adhesive member satisfy 10 mm ⁇ W 3 ⁇ L 2 ⁇ 30 mm. If the length of the first bonding member is too small, in the vertical winding direction, it is impossible to avoid the damage of the end diaphragm due to mechanical abuse. If the length of the first bonding member is too large, the thickness of the electrode assembly will be affected and the thickness of the electrode assembly will be reduced. Energy Density.
  • the electrochemical device further includes a fourth bonding member that bonds the outer surface of the outermost ring current collector in the first straight section and the outermost ring of the first straight section.
  • the outer surface of the current collector is opposite to the diaphragm.
  • the outermost ring current collector in the first straight section is bonded to the corresponding closing diaphragm to form an integrated structure, which enhances the strength of the closing diaphragm here, and further improves the mechanical abuse of the electrochemical device. The problem of failure improves the safety, reliability and service life of electrochemical devices.
  • the end of the diaphragm exceeds the end of the current collector by one turn.
  • the closing diaphragm is one ring, and the integrated structure formed by the outermost ring current collector and the closing diaphragm in the first straight section has a higher strength, which further improves the safety, reliability and service life of the electrochemical device.
  • the fourth adhesive member covers the projection of the first adhesive member on the plane where the fourth adhesive member is located.
  • the first bonding member and the fourth bonding member overlap to further enhance the strength of the integrated structure formed by the outermost ring current collector and the closing diaphragm in the first straight section, and further improve the safety and reliability of the electrochemical device And service life.
  • the winding direction, the width W of the adhesive member 4 and the fourth the width W of the first adhesive member 2 satisfies 4mm ⁇ W 4 -W 2 ⁇ 10mm.
  • the width of the fourth bonding member exceeds a certain range of the first bonding member, which can enhance the strength of the integrated structure formed by the outermost current collector and the end diaphragm in the first straight section in the winding direction, and further improve the electrical The safety, reliability and service life of chemical devices.
  • the winding in the vertical direction, and the length L 4 of the first adhesive member fourth adhesive member satisfies L 2 4mm ⁇ L 4 -L 2 ⁇ 10mm.
  • the length of the fourth bonding member exceeds a certain range of the first bonding member, which can enhance the integrated structural strength formed by the outermost current collector and the end diaphragm in the first straight section in the vertical winding direction, and further improve The safety, reliability and service life of electrochemical devices.
  • the electrochemical device further includes a housing, the electrode assembly is accommodated in the housing, and the first adhesive member is bonded to the housing.
  • the electrode assembly and the housing can be formed into an integrated structure, which improves the failure of the electrochemical device under mechanical abuse, and further improves the safety, reliability, and Service life.
  • the membrane is a polypropylene membrane.
  • the diaphragm made of polypropylene diaphragm can effectively reduce the cost of electrochemical device.
  • the application also provides an electronic device, which includes the above-mentioned electrochemical device.
  • Fig. 1 is a schematic cross-sectional view of an electrochemical device.
  • FIG. 2 is a schematic cross-sectional view of the second bonding surface of the electrochemical device provided on the outer surface of the outermost ring current collector of the first bending section.
  • FIG. 3 is a schematic cross-sectional view of the electrochemical device shown in FIG. 1 provided with a third adhesive member.
  • FIG. 4 is a schematic cross-sectional view of the electrochemical device shown in FIG. 2 provided with a third adhesive member.
  • Figure 5 is a schematic plan view of an electrochemical device.
  • Fig. 6 is a schematic cross-sectional view of the electrochemical device provided with a fourth adhesive member.
  • the first pole piece A A is The first pole piece A.
  • the first extension department 31 The first extension department 31
  • An electrochemical device includes an electrode assembly, a first bonding member and a second bonding member.
  • the electrode assembly includes a pole piece and a diaphragm.
  • the pole piece and the diaphragm are sequentially stacked and wound to form an electrode assembly.
  • the pole piece includes a current collector.
  • the electrode assembly also includes a first straight section and a first bent section that are connected to each other. Wherein, along the winding direction, the end of the diaphragm exceeds the end of the current collector by 1 to 5 turns, the first adhesive member is provided on the outer surface of the first straight section, and the second adhesive member is provided on the first bending section. The outer surface of the outer surface or the outer surface of the outermost ring current collector in the first bending section.
  • the diaphragm forms a protective layer through the end of the diaphragm by 1 to 5 turns, which effectively increases the mechanical impact resistance of the outer diaphragm, and is the most effective in the outer surface of the first bending section or the first bending section.
  • the outer surface of the outer ring current collector is provided with a second adhesive member, so that the end diaphragm at the first bending section can be prevented from being damaged.
  • the first adhesive is provided on the outer surface of the first straight section, which can increase the strength of the end diaphragm at the first straight section in the vertical winding direction, and increase the pass rate of the electrochemical device during the safety performance test. , Improve the safety and service life of the electrochemical device.
  • the winding direction in this application refers to the direction in which a certain point on the electrode assembly moves from the inside to the outside along the current collector or the diaphragm. There are two winding directions, namely clockwise and counterclockwise winding.
  • a circle refers to counting from a certain point on the wound electrode assembly as the starting end, and ending at another point along the winding direction, and the ending end and the starting end are located on the same side of the electrode assembly.
  • an electrochemical device 100 which includes an electrode assembly 10, a first bonding member 20 and a second bonding member 30.
  • the electrode assembly 10 includes a pole piece 11 and a diaphragm 12.
  • the pole piece 11 and the diaphragm 12 are stacked and wound in sequence to form the electrode assembly 10.
  • the pole piece 11 includes a current collector 111, and the electrode assembly 10 also includes a first straight section 13 and a first straight section 13 and One bending section 14.
  • the first adhesive member 20 is provided on the outer surface of the first straight section 13
  • the second adhesive member 30 is provided on The outer surface of the first bending section 14 or the outer surface of the outermost current collector 141 in the first bending section.
  • the starting end refers to the end where the pole piece 11 or the diaphragm 12 starts to be wound in the winding direction
  • the ending end refers to the end where the pole piece 11 or the diaphragm 12 is wound in the winding direction.
  • the outer surface refers to the surface away from the start end of the winding.
  • the pole piece 11 includes a first pole piece A and a second pole piece B, and the diaphragm 12 is disposed between the first pole piece A and the second pole piece B and is wound.
  • the first pole piece A is an anode pole piece
  • the second pole piece B is a cathode pole piece.
  • first pole piece A and the second pole piece B can be replaced with each other. That is, the first pole piece A is a cathode pole piece, and the second pole piece B is an anode pole piece.
  • the outermost current collector 141 in the first bending section is aluminum foil. In one embodiment, the outermost current collector 141 in the first bending section is copper foil. It can be understood that, in other embodiments, the material of the outermost current collector 111 is not limited to this.
  • the starting end of the diaphragm 12 is wound at the same time as the pole piece 11. After the winding of the pole piece 11 is terminated, the outer surface of the outermost circle is generally the outer surface of the current collector 111, and the end of the diaphragm 12 exceeds the end of the current collector 111 several times.
  • a protective layer can be formed on the surface of the current collector 111, which effectively increases the mechanical impact resistance of the outer diaphragm, prevents the diaphragm 12 from being damaged under mechanical abuse, and can also protect the internal structure of the electrochemical device 100 to avoid its internal structure It is damaged when subjected to external mechanical impact.
  • the electrode assembly 10 further includes a second straight section 15 and a second bent section 16.
  • the first straight section 13 and the second straight section 15 are arranged along the vertical direction (take the direction in the drawing as a reference), the first straight section 13 is located at the upper end, and the second straight section 15 is located at the lower end.
  • the first bending section 14 and the second bending section 16 are arranged in a horizontal direction (take the direction in the drawing as a reference), the first bending section 14 is located at the left end, and the second bending section 16 is located at the right end.
  • the two ends of the first bent section 14 are respectively connected to one end of the first straight section 13 and the second straight section 15, and the two ends of the second bent section 16 are connected to the first straight section 13 and the second straight section respectively.
  • the other end of segment 15 is connected.
  • the first straight section 13, the first bent section 14, the second straight section 15, and the second bent section 16 are the straight section and the bent section including the pole piece 11 and the diaphragm 12, respectively, to connect the pole piece
  • the straight section and the bending section of the diaphragm 11 and the diaphragm 12 are divided into four areas as a whole, namely the first straight section 13, the first bending section 14, the second straight section 15, and the second bending section 16 for description.
  • the first straight section 13 includes the outermost circle current collector 131 in the first straight section, and the outermost circle current collector 131 in the first straight section is located at the outermost circle of the current collector 111 in the first straight section 13.
  • the first bending section 14 includes the outermost ring current collector 141 in the first bending section.
  • the outermost ring current collector 141 in the first bending section is located at the outermost layer of the current collector 111 in the first bending section 14, and
  • the outermost circle current collector 131 in a straight section is connected to one end of the outermost circle current collector 141 in the first bent section.
  • the second straight section 15 includes the outermost current collector 151 in the second straight section, and the outermost current collector 151 in the second straight section is located at the outermost layer of the current collector 111 in the second straight section 15 , And one end of the outermost current collector 151 in the second straight section is connected to the other end of the outermost current collector 141 in the first bent section.
  • the second bending section 16 includes the outermost ring current collector 161 in the second bending section, the outermost ring current collector 161 in the second bending section is located at the outermost layer of the current collector 111 in the second bending section 16, and Both ends of the outermost circle current collector 161 in the two bending sections are respectively connected with the outermost circle current collector 131 in the first straight section and the outermost circle current collector 151 in the second straight section.
  • the first bonding member 20 is disposed on the outer surface of the first straight section 13, that is, the first bonding member 20 is disposed on the outer surface of the diaphragm 12 in the first straight section 13. That is, after the current collector 111 is continuously wrapped for a plurality of turns at the end of the diaphragm 12, the first adhesive member 20 is provided on the outer surface of the end. Further, the first adhesive member 20 is arranged at the middle position of the first straight section 13 along the winding direction.
  • the width W 2 of the first adhesive member 20 satisfies 5mm ⁇ W 2 ⁇ 50mm. If the width of the first adhesive member 20 is too small, in the winding direction, mechanical abuse of the end diaphragm 12 cannot be avoided In case of breakage. If the width of the first adhesive member 20 is too large, the thickness of the electrode assembly 10 will be affected and the energy density will be reduced. Therefore, the width of the first adhesive member 20 may be set to 5 mm ⁇ W 2 ⁇ 50 mm.
  • the length of the first adhesive member 20 is L 2
  • the width of the diaphragm 12 is W 3 .
  • the width W 3 of the diaphragm 12 and the length L 2 of the first adhesive member 20 satisfy 10 mm ⁇ W 3 ⁇ L 2 ⁇ 30 mm. If the length of the first adhesive member 20 is too small, in the vertical winding direction, it is impossible to avoid the damage of the finishing diaphragm 12 under mechanical abuse. If the length of the first adhesive member 20 is too large, it will affect the electrode assembly. Thickness, reduce energy density.
  • the first adhesive member 20 can also be provided on the outer surface of the second straight section 15, that is, the first adhesive member 20 is provided on the diaphragm 12 in the second straight section 15.
  • the outer surface Alternatively, the outer surfaces of the first straight section 13 and the second straight section 15 are both provided with the first adhesive member 20.
  • the second adhesive member 30 is provided on the outer surface of the first bending section 14. Further, one end of the second adhesive member 30 includes a first extension portion 31, and the first extension portion 31 is provided on the outer surface of the first straight section 13.
  • the second adhesive member 30 is provided on the outer surface of the first bending section 14, and the first extension portion 31 of its end is provided on the first straight section 13 connected to the first bending section 14, so as to be effective Protect the transition section between the first bent section 14 and the first straight section 13, which can protect the end diaphragm 12 at the junction of the first straight section 13 and the first bent section 14, and improve the angular position of the end diaphragm 12 In the case of mechanical abuse, it is easy to break and cause the failure of the electrochemical device 100, which improves the safety, reliability and service life.
  • the width W 1 of the first extension portion 31 satisfies 0 mm ⁇ W 1 ⁇ 5 mm, that is, the first extension portion 31 must be guaranteed to exceed the first bent section 14 and extend to the first straight section 13.
  • This arrangement can ensure that the first extension portion 31 has a certain width to protect the corners of the end diaphragm 12 from being damaged, and it can also prevent the width of the first extension portion 31 from being too large and increase the thickness of the first straight section 13, resulting in energy reduce.
  • the other end of the second adhesive member 30 further includes a second extension portion 32, and the second extension portion 32 is provided on the outer surface of the second straight section 15.
  • the structure and width of the second extension portion 32 and the first extension portion 31 are substantially the same.
  • the electrochemical device 100 further includes a third bonding member 40, and the third bonding member 40 is disposed on the outer surface of the second bending section 16.
  • This arrangement can effectively avoid the breakage of the diaphragm 12 at the end of the second bending section 16 and further improve the safety and service life of the electrochemical device 100.
  • the third adhesive member 40 has the same shape and structure as the second adhesive member 30 described above. The only difference between the two is that one is provided on the first bending section 14 and the other is provided on the second bending section. 16 on. Adhesives are respectively provided on the first bending section 14 and the second bending section 16 of the electrode assembly 10 to effectively protect the first straight section 13 and the first bending section 14 and the second bending section 16.
  • the end of the diaphragm 12 can be wound to the position of the first bending section 14 or the second bending section 16 of the electrode assembly 10 and fixed by the second adhesive member 30 or the third adhesive member 40.
  • the second bonding member 30 is provided on the outer surface of the outermost ring current collector 141 in the first bending section, and the first extension portion of the second bonding member 30 31 is provided on the outer surface of the outermost current collector 131 in the first straight section.
  • the second extension portion 32 of the second bonding member 30 is provided on the outer surface of the outermost current collector 151 in the second straight section.
  • the first extension part 31 By arranging the first extension part 31 on the outer surface of the outermost current collector 131 in the first straight section, it is possible to alleviate the connection between the first straight section 13 and the first bending section 14 at the corner position of the current collector 111 and the end.
  • the squeezing action between the diaphragms 12 improves the problem that the corners of the closing diaphragm 12 are easily damaged under mechanical abuse and cause the failure of the electrochemical device, and improves the safety, reliability and service life.
  • the second extension portion 32 is provided on the outer surface of the outermost ring current collector 151 in the second straight section, which can also relieve the angular position of the current collector 111 at the junction of the first bent section 14 and the second straight section 15 The squeezing action between the diaphragms 12 is finished, so as to avoid the problem of failure of the electrochemical device 100.
  • the third adhesive member 40 can also be provided on the outermost ring current collector in the second bending section.
  • the electrochemical device 100 further includes a fourth bonding member 50, and the fourth bonding member 50 bonds the outer surface of the outermost current collector 131 in the first straight section to the outer surface of the outermost current collector 131 in the first straight section.
  • the outer surface of the outer ring current collector 131 is opposite to the diaphragm 12.
  • the outermost current collector 131 in the first straight section is bonded to the corresponding closing diaphragm 12 to form an integrated structure, which enhances the strength of the closing diaphragm 12 here, and further improves the failure of the electrochemical device 100 under mechanical abuse. The problem of improving the safety, reliability and service life of electrochemical devices.
  • the end of the diaphragm 12 exceeds the end of the current collector 111 by one turn.
  • the integrated structure formed by the outermost ring current collector 131 and the closing diaphragm 12 in the first straight section has a higher strength, which further improves the safety, reliability and service life of the electrochemical device 100.
  • the fourth adhesive member 50 covers the projection of the first adhesive member 20 on the plane where the fourth adhesive member 50 is located.
  • the first bonding member 20 and the fourth bonding member 50 overlap to further enhance the strength of the integrated structure formed by the outermost ring current collector 131 and the closing diaphragm 12 in the first straight section, and further improve the safety and reliability of the electrochemical device. Service life.
  • the winding direction, the fourth adhesive member 4 and the width W of the width W 50 of the first adhesive member 2 satisfies 4mm ⁇ W 3 -W 2 ⁇ 10mm.
  • the longitudinal direction of the winding, the length L 4 fourth adhesive of the first adhesive member 50 perpendicular to the L 2 satisfy 4mm ⁇ L 4 -L 2 ⁇ 10mm. That is to say, the width of the fourth adhesive member 50 is greater than the width of the first adhesive member 20, and the length of the fourth adhesive member 50 is greater than the length of the first adhesive member 20. In this way, the fourth adhesive member 50 can effectively fix the outermost current collector 131 and the diaphragm 12 in the first straight section, and the safety of the electrode assembly 10 is significantly improved when the safety performance test is performed.
  • the pole piece 11 is also provided with a lug 60, and the lug 60 is fixed to the pole piece 11 by welding. It can be understood that, in other embodiments, the pole piece 11 and the tab 60 may also be an integrally formed structure.
  • the electrochemical device 100 further includes a casing (not shown), and the electrode assembly 10 is accommodated in the casing.
  • the first bonding member 20, the second bonding member 30 provided on the outer surface of the first bending section 14, and the third bonding member 40 provided on the outer surface of the second bending section 16 may also be bonded to the housing .
  • the second bonding member 30 is provided on the outermost ring current collector 141 in the first bending section
  • the third bonding member 40 is provided on the outermost ring current collector 161 in the second bending section, it can only pass through the first bending section.
  • a bonding member 20 is bonded to the housing.
  • the electrode assembly 10 is adhered to the housing through the first bonding member 20, the second bonding member 30, and the third bonding member 40, which can prevent the electrode assembly 10 from failing when subjected to external impact, and improve the safety of the electrode assembly 10 .
  • the application also includes an electronic device (not shown in the figure).
  • the electronic device includes the above-mentioned electrochemical device 100.
  • the electronic device may be a mobile phone, a digital product, a tablet, a wearable device, a drone, or an electric tool. , Energy storage devices, electric vehicles, etc.
  • the diaphragm 12 is made of polypropylene film or polyethylene film.
  • the diaphragm 12 is made of polypropylene film. Compared with polyethylene film, polypropylene film has low cost, but its strength is low. By using a polypropylene film to make the diaphragm 12, the cost can be reduced by 40% to 60%, which is significant for reducing the overall cost of the electrochemical device 100. By arranging the diaphragm 12 to be wound around 1 to 5 times, and arranging the first adhesive member and the second adhesive member, the strength of the polypropylene film can be enhanced, and the safety, reliability and service life can be improved.
  • the electrochemical device 100 provided by the present application can further protect the electrode assembly 10 when the electrode assembly 10 is subjected to external impact by making the end of the diaphragm 12 continue to be wound around the electrode assembly 10 to avoid the electrode assembly 10 10
  • the internal diaphragm 12 is damaged.
  • a first adhesive member 20 is provided on the outer surface of the electrode assembly 10
  • a second adhesive member 30 is provided on the outer surface of the first bending section 14 or the outer surface of the outermost current collector 141 in the first bending section.

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Abstract

一种电化学装置（100）和包含电化学装置（100）的电子装置，电化学装置（100）包括电极组件（10）、第一粘接件（20）和第二粘接件（30）。电极组件（10）包括极片（11）和隔膜（12），极片（11）和隔膜（12）依次层叠卷绕形成电极组件（10），极片（11）包括集流体（111），电极组件（10）包括相互连接的第一平直段（13）和第一弯折段（14）。其中，沿卷绕方向，隔膜（12）的收尾端超出集流体（111）的收尾端1至5圈，第一粘接件（20）设于第一平直段（13）的外表面，第二粘接件（30）设于第一弯折段（14）的外表面或第一弯折段中最外圈集流体（141）的外表面。粘接件的设置可以改善隔膜（12）的收尾端在机械滥用情况容易破损的问题，增强隔膜（12）在垂直卷绕方向的强度，提高电化学装置（100）的安全可靠性和使用寿命。

Description

电化学装置及采用该电化学装置的电子装置 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采用该电化学装置的电子装置。
背景技术
随着电化学装置工艺成熟化，其在消费电子、电动装置汽车和电动工具等领域被广泛应用。
目前的电化学装置产品中，为了提高电化学装置的安全性能，在电极组件制造过程中会采用隔膜收尾。但在实际使用过程，电化学装置在机械滥用情况(如跌落、冲击、碰撞等)下，隔膜容易破损，导致电化学装置容易失效，安全风险增大，使用寿命降低。
发明内容
有鉴于此，有必要提供一种电化学装置，旨在至少解决一个现有技术存在的问题。
针对现有技术存在的问题，本申请提供以下手段。
本申请提供一种电化学装置，包括电极组件、第一粘接件和第二粘接件。电极组件包括极片和隔膜，极片和隔膜依次层叠卷绕形成电极组件，极片包括集流体，电极组件包括相互连接的第一平直段和第一弯折段。其中，沿卷绕方向，隔膜的收尾端超出集流体的收尾端1至5圈，第一粘接件设于第一平直段的外表面，第二粘接件设于第一弯折段的外表面或第一弯折段中最外圈集流体的外表面。
本申请通过隔膜收尾1至5圈，使得隔膜形成一保护层，有效增加了外层隔膜耐机械冲击性能，并在第一弯折段的外表面或第一 弯折段中最外圈集流体的外表面设置第二粘接件，从而可避免第一弯折段处收尾隔膜出现破损的情况。同时，在第一平直段的外表面设置第一粘接件，能够提高第一平直段处收尾隔膜沿垂直卷绕方向上的强度。如此提高了电化学装置的安全性和使用寿命。
在至少一个实施方式中，第二粘接件设于第一弯折段的外表面，第二粘接件包括第一延伸部，第一延伸部设于第一平直段的外表面。通过将第一延伸部设于第一平直段，可以保护第一平直段和第一弯折段连接角位处的收尾隔膜，改善角位处收尾隔膜在机械滥用情况下容易破损导致电化学装置失效的问题，提高安全可靠性和使用寿命。
在至少一个实施方式中，第二粘接件设于第一弯折段中最外圈集流体的外表面，第一延伸部设于第一平直段中最外圈集流体的外表面。通过将第一延伸部设于第一平直段中最外圈集流体的外表面，可以缓解第一平直段和第一弯折段连接角位处的集流体与收尾隔膜之间的挤压作用，改善角位处收尾隔膜在机械滥用情况下容易破损导致电化学装置失效的问题，提高安全可靠性和使用寿命。
在至少一个实施方式中，沿卷绕方向，第一延伸部的宽度W 1满足0mm<W 1≤5mm。如此设置，可以保证第一延伸部具有一定宽度可以保护收尾隔膜角位处不破损，也可让第一延伸部宽度不会太大增加第一平直段的厚度，导致能量密度降低。
在至少一个实施方式中，电极组件还包括第二平直段，第二平直段与第一弯折段连接，第二粘接件还包括第二延伸部，第二延伸部设于第二平直段的外表面。本实施方式中，通过设置第二延伸部，可以进一步保护收尾隔膜的角位处，改善第一弯折段和第二平直段连接处的收尾隔膜在机械滥用情况下容易破损导致电化学装置失效的问题，进一步提高安全可靠性和使用寿命。
在至少一个实施方式中，第二延伸部设于第二平直段中最外圈 集流体的外表面。通过将第二延伸部设于第二平直段中最外圈集流体的外表面，可以进一步缓解第一弯折段和第二平直段连接处的集流体与收尾隔膜之间的挤压作用，改善收尾隔膜角位处在机械滥用情况下容易破损导致电化学装置失效的问题，进一步提高安全可靠性和使用寿命。
在至少一个实施方式中，电化学装置还包括第三粘接件，电极组件还包括第二弯折段，第二弯折段的两端分别与第一水平段和第二水平段连接，第三粘接件设于第二弯折段的外表面或第二弯折段中最外圈集流体的外表面。本实施方式中，在第二弯折段的外表面或第二弯折段中最外圈集流体的外表面设置第三粘接件，从而可避免第二弯折段处收尾隔膜出现破损的情况，进一步提高电化学装置的安全性和使用寿命。
在至少一个实施方式中，沿卷绕方向，第一粘接件的宽度W 2满足5mm≤W 2≤50mm。若第一粘接件宽度太小，则在卷绕方向上，不能避免收尾隔膜在机械滥用情况的破损情况，若第一粘接件宽度太大，则会影响电极组件的厚度，降低能量密度。
在至少一个实施方式中，沿垂直卷绕方向，隔膜的宽度W 3与所述第一粘接件的长度L 2满足10mm≤W 3-L 2≤30mm。若第一粘接件长度度太小，则在垂直卷绕方向上，不能避免收尾隔膜在机械滥用情况的破损情况，若第一粘接件长度太大，则会影响电极组件的厚度，降低能量密度。
在至少一个实施方式中，电化学装置还包括第四粘接件，第四粘接件粘接第一平直段中最外圈集流体的外表面和与第一平直段中最外圈集流体的外表面相对的隔膜。本实施方式中，将第一平直段中最外圈集流体与对应的收尾隔膜进行粘接，形成一体化结构，增强收尾隔膜在此处的强度，进一步改善电化学装置在机械滥用情况下失效的问题，提高电化学装置的安全可靠性和使用寿命。
在至少一个实施方式中，沿卷绕方向，隔膜的收尾端超出集流体的收尾端1圈。在本实施方式中，收尾隔膜为1圈，第一平直段中最外圈集流体与收尾隔膜形成的一体化结构强度更高，进一步提高电化学装置的安全可靠性和使用寿命。
在至少一个实施方式中，第四粘接件覆盖第一粘接件在第四粘接件所在平面的投影。本实施方式中，第一粘接件和第四粘接件重叠，进一步增强第一平直段中最外圈集流体与收尾隔膜形成的一体化结构强度，进一步提高电化学装置的安全可靠性和使用寿命。
在至少一个实施方式中，沿卷绕方向，第四粘接件的宽度W 4与第一粘接件的宽度W 2满足4mm≤W 4-W 2≤10mm。在本实施方式中，第四粘接件宽度超出第一粘接件一定范围，可以增强卷绕方向第一平直段中最外圈集流体与收尾隔膜形成的一体化结构强度，进一步提高电化学装置的安全可靠性和使用寿命。
在至少一个实施方式中，沿垂直卷绕方向，第四粘接件的长度L 4与第一粘接件的长度L 2满足4mm≤L 4-L 2≤10mm。在本实施方式中，第四粘接件长度超出第一粘接件一定范围，可以增强垂直卷绕方向第一平直段中最外圈集流体与收尾隔膜形成的一体化结构强度，进一步提高电化学装置的安全可靠性和使用寿命。
在至少一个实施方式中，电化学装置还包括壳体，电极组件容纳于壳体中，第一粘接件与壳体粘接。在本实施方式中，通过将第一粘接件与壳体粘接，可以使电极组件和壳体形成一体化结构，改善电化学装置在机械滥用情况下的失效问题，进一步提高安全可靠性和使用寿命。
在至少一个实施方式中，隔膜为聚丙烯隔膜。通过使用聚丙烯隔膜制作成的隔膜，可有效降低电化学装置的成本。
本申请还提供一种电子装置，其包括上述的电化学装置。
附图说明
图1为电化学装置的剖视示意图。
图2为电化学装置中第二粘接面设于第一弯折段最外圈集流体外表面的剖视示意图。
图3为图1中所示的电化学装置设有第三粘接件的剖视示意图。
图4为图2所示的电化学装置中设有第三粘接件的剖视示意图。
图5为电化学装置的平面示意图。
图6为电化学装置中设有第四粘接件的剖视示意图。
主要元件符号说明
电化学装置                 100
电极组件                   10
极片                       11
集流体                     111
第一极片                   A
第二极片                   B
隔膜                       12
第一平直段                 13
第一平直段中最外圈集流体   131
第一弯折段                 14
第一弯折段中最外圈集流体   141
第二平直段                 15
第二平直段中最外圈集流体   151
第二弯折段                 16
第二弯折段中最外圈集流体   161
第一粘接件                 20
第二粘接件                 30
第一延伸部                  31
第二延伸部                  32
第三粘接件                  40
第四粘接件                  50
极耳                        60
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，当一个组件被认为是“连接”另一个组件，它可以是直接连接到另一个组件或者可能同时存在居中组件。当一个组件被认为是“设于”另一个组件，它可以是直接设置在另一个组件上或者可能同时存在居中组件。本文所使用的术语“顶”、“底”、“上”、“下”、“左”、“右”、“前”、“后”、以及类似的表述只是为了说明的目的。
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发明的技术领域的技术人员通常理解的含义相同。本文中在本发明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，不是旨在于限制本发明。
一种电化学装置，包括电极组件、第一粘接件和第二粘接件。电极组件包括极片和隔膜，极片和隔膜依次层叠卷绕形成电极组件，极片包括集流体，电极组件还包括相互连接的第一平直段和第一弯折段。其中，沿卷绕方向，隔膜的收尾端超出集流体的收尾端1至5圈，第一粘接件设于第一平直段的外表面，第二粘接件设于第一 弯折段的外表面或第一弯折段中最外圈集流体的外表面。
上述的电化学装置，通过隔膜收尾1至5圈，使得隔膜形成一保护层，有效增加了外层隔膜耐机械冲击性能，并在第一弯折段的外表面或第一弯折段中最外圈集流体的外表面设置第二粘接件，从而可避免第一弯折段处收尾隔膜出现破损的情况。同时，在第一平直段的外表面设置第一粘接件，能够提高第一平直段处收尾隔膜沿垂直卷绕方向上的强度，增加电化学装置在进行安全性能测试时的通过率，提高了电化学装置的安全性和使用寿命。
而将隔膜收尾端设置为超过卷绕集流体收尾端1至5圈，一方面是基于保护效果的考虑，另一方面是基于材料成本和电化学装置能量密度损失的考量。若隔膜卷绕的过多，成本会相应的增加，且会降低能量密度。
本申请中卷绕方向是指电极组件上的某一点沿着集流体或隔膜从内向外移动的方向，卷绕方向可以有两种，即顺时针和逆时针卷绕。
本申请中一圈是指从卷绕式电极组件上的某个点作为起始端开始计算，沿着卷绕方向一周到达另一个点为结束端，结束端与起始端位于电极组件的同一侧。
下面将对本申请的一些实施方式作详细说明，在不冲突的情况下，下述的实施方式即实施方式中的特征可以相互组合。
请参阅图1和图2，提供一种电化学装置100，包括电极组件10、第一粘接件20和第二粘接件30。电极组件10包括极片11和隔膜12，极片11和隔膜12依次层叠卷绕形成电极组件10，极片11包括集流体111，电极组件10还包括相互连接的第一平直段13和第一弯折段14。其中，沿卷绕方向，隔膜12的收尾端超出集流体111的收尾端1至5圈，第一粘接件20设于第一平直段13的外表面，第二粘接件30设于第一弯折段14的外表面或第一弯折段中最外圈 集流体141的外表面。
本申请中，起始端是指沿卷绕方向极片11或隔膜12卷绕开始的一端，收尾端是指沿卷绕方向极片11或隔膜12卷绕终止的一端。
本申请中，外表面是指远离卷绕起始端的表面。
具体的，极片11包括第一极片A和第二极片B，隔膜12设于第一极片A和第二极片B之间并进行卷绕。在一实施方式中，第一极片A为阳极极片，第二极片B为阴极极片。
可以理解的是，在其他实施方式中，第一极片A和第二极片B的可以相互进行替换。即第一极片A为阴极极片，第二极片B为阳极极片。
在一实施方式中，第一弯折段中最外圈集流体141为铝箔。在一实施方式中，第一弯折段中最外圈集流体141为铜箔。可以理解的是，在其他实施方式中，最外层集流体111的材质不限于此。
隔膜12的起始端与极片11同时进行卷绕，极片11卷绕终止后最外圈外表面一般为集流体111的外表面，隔膜12的收尾端超过集流体111的收尾端复数圈，可在集流体111的表面上形成保护层，有效增加了外层隔膜耐机械冲击性能，避免隔膜12在机械滥用情况下破损，还能够对电化学装置100的内部结构进行保护，避免其内部结构在受到外界的机械冲击力时出现破损的情况。
电极组件10还包括第二平直段15和第二弯折段16。第一平直段13和第二平直段15沿竖直方向设置(以附图中方向作为参考)，第一平直段13位于上端，第二平直段15位于下端。第一弯折段14和第二弯折段16沿水平方向设置(以附图中方向作为参考)，第一弯折段14位于左端，第二弯折段16位于右端。第一弯折段14的两端分别与第一平直段13和第二平直段15的一端连接，第二弯折段16的两端分别与第一平直段13和第二平直段15的另一端连接。
第一平直段13、第一弯折段14、第二平直段15和第二弯折段 16分别是包括了极片11和隔膜12的平直段与弯折段，以将极片11和隔膜12的平直段与折弯段整体分为四个区域，即第一平直段13、第一弯折段14、第二平直段15和第二弯折段16进行说明。
第一平直段13包括第一平直段中最外圈集流体131，第一平直段中最外圈集流体131位于第一平直段13中集流体111的最外圈。第一弯折段14包括第一弯折段中最外圈集流体141，第一弯折段中最外圈集流体141位于第一弯折段14中集流体111的最外层，且第一平直段中最外圈集流体131与第一弯折段中最外圈集流体141的一端连接。同样的，第二平直段15包括第二平直段中最外圈集流体151，第二平直段中最外圈集流体151位于第二平直段15中集流体111的最外层，且第二平直段中最外圈集流体151的一端与第一弯折段中最外圈集流体141的另一端连接。第二弯折段16包括第二弯折段中最外圈集流体161，第二弯折段中最外圈集流体161位于第二弯折段16中集流体111的最外层，且第二弯折段中最外圈集流体161的两端分别与第一平直段中最外圈集流体131和第二平直段中最外圈集流体151连接。
第一粘接件20设于第一平直段13的外表面，即第一粘接件20设于第一平直段13中隔膜12的外表面。即在隔膜12的收尾端将集流体111继续包覆复数圈后，在收尾端的外表面设置第一粘接件20。进一步地，第一粘接件20设置在第一平直段13沿卷绕方向的中间位置处。
沿卷绕方向，第一粘接件20的宽度W 2满足5mm≤W 2≤50mm，若第一粘接件20的宽度太小，则在卷绕方向上，不能避免收尾隔膜12在机械滥用情况下的破损。若第一粘接件20的宽度太大，则会影响电极组件10的厚度，降低能量密度。因此，第一粘接件20的宽度设置在5mm≤W 2≤50mm即可。
请参阅图5，垂直于卷绕方向，第一粘接件20的长度为L 2，隔 膜12的宽度为W 3。在一实施方式中，隔膜12的宽度W 3与第一粘接件20的长度L 2满足10mm≤W 3-L 2≤30mm。若第一粘接件20长度度太小，则在垂直卷绕方向上，不能避免收尾隔膜12在机械滥用情况下的破损，若第一粘接件20长度太大，则会影响电极组件的厚度，降低能量密度。
可以理解的是，在其他实施方式中，第一粘接件20也可设于第二平直段15的外表面，即第一粘接件20设于第二平直段15中隔膜12的外表面。或者，第一平直段13和第二平直段15的外表面均设置第一粘接件20。
请参阅图1和图3，在一实施方式中，第二粘接件30设于第一弯折段14的外表面。进一步的，第二粘接件30的一端包括第一延伸部31，第一延伸部31设于第一平直段13的外表面。第二粘接件30设于第一弯折段14的外表面，其端部的第一延伸部31设于与第一弯折段14连接的第一平直段13上，从而能够有效的保护第一弯折段14与第一平直段13之间的过渡段，可以保护第一平直段13和第一弯折段14连接处的收尾隔膜12，改善收尾隔膜12角位处在机械滥用情况下容易破损导致电化学装置100失效的问题，提高安全可靠性和使用寿命。
沿卷绕方向，第一延伸部31的宽度W 1满足0mm<W 1≤5mm，即第一延伸部31要保证超过第一弯折段14而延伸至第一平直段13上。如此设置，可以保证第一延伸部31具有一定宽度可以保护收尾隔膜12角位处不破损，也可让第一延伸部31宽度不会太大而增加第一平直段13的厚度，导致能量降低。
第二粘接件30的另一端还包括第二延伸部32，第二延伸部32设于第二平直段15的外表面。第二延伸部32与第一延伸部31的结构、宽度大致相同。通过设置第二延伸部32，可以进一步保护收尾隔膜12的角位处，改善第一弯折段14和第二平直段15连接处 的收尾隔膜12在机械滥用情况下容易破损导致电化学装置100失效的问题，进一步提高安全可靠性和使用寿命。
请参阅图3，电化学装置100还包括第三粘接件40，第三粘接件40设于第二弯折段16的外表面。如此设置，可以有效避免第二弯折段16收尾处隔膜12出现破损情况，进一步提高了电化学装置100的安全性和使用寿命。进一步的，第三粘接件40与上述的第二粘接件30的形状、结构相同，二者的区别仅是一个设于第一弯折段14上，另一个设于第二弯折段16上。在电极组件10的第一弯折段14和第二弯折段16上分别设置粘接件，可以有效保护第一平直段13与第一弯折段14和第二弯折段16。
隔膜12的收尾端可以卷绕至电极组件10的第一弯折段14或第二弯折段16的位置处，通过第二粘接件30或第三粘接件40进行固定。
请参阅图2和图4，在另一实施方式中，第二粘接件30设于第一弯折段中最外圈集流体141的外表面，第二粘接件30的第一延伸部31设于第一平直段中最外圈集流体131的外表面。而第二粘接件30的第二延伸部32设于第二平直段中最外圈集流体151的外表面。
通过将第一延伸部31设于第一平直段中最外圈集流体131的外表面，可以缓解第一平直段13和第一弯折段14连接角位处的集流体111与收尾隔膜12之间的挤压作用，改善收尾隔膜12角位处在机械滥用情况下容易破损导致电化学装置失效的问题，提高安全可靠性和使用寿命。第二延伸部32设于第二平直段中最外圈集流体151的外表面，同样可以起到缓解第一弯折段14和第二平直段15连接处的角位集流体111与收尾隔膜12之间的挤压作用，从而避免电化学装置100出现失效的问题。
同样的，在第二粘接件30设于第一弯折段中最外圈集流体141 的外表面时，第三粘接件40也可设于第二弯折段中最外圈集流体161的外表面。以改善第二弯折段处收尾隔膜12易破损的问题。
请参阅图6，电化学装置100还包括第四粘接件50，第四粘接件50粘接第一平直段中最外圈集流体131的外表面和与第一平直段中最外圈集流体131外表面相对的隔膜12。将第一平直段中最外圈集流体131与对应的收尾隔膜12进行粘接，形成一体化结构，增强收尾隔膜12在此处的强度，进一步改善电化学装置100在机械滥用情况下失效的问题，提高电化学装置的安全可靠性和使用寿命。
在一实施方式中，沿卷绕方向，隔膜12的收尾端超出集流体111的收尾端1圈。此时，第一平直段中最外圈集流体131与收尾隔膜12形成的一体化结构强度更高，进一步提高电化学装置100的安全可靠性和使用寿命。
进一步的，第四粘接件50覆盖第一粘接件20在第四粘接件50所在平面的投影。第一粘接件20和第四粘接件50重叠，进一步增强第一平直段中最外圈集流体131与收尾隔膜12形成的一体化结构强度，进一步提高电化学装置的安全可靠性和使用寿命。
在一实施方式中，沿卷绕方向，第四粘接件50的宽度W 4与第一粘接件的宽度W 2满足4mm≤W 3-W 2≤10mm。在一实施方式中，沿垂直于卷绕方向，第四粘接件50的长度L 4与第一粘接件的长度L 2满足4mm≤L 4-L 2≤10mm。即表明，第四粘接件50的宽度要大于第一粘接件20的宽度，且第四粘接件50的长度大于第一粘接件20的长度。如此一来，第四粘接件50可有效固定第一平直段中最外圈集流体131与隔膜12，电极组件10在进行安全性能测试时，其安全性有了显著的提升。
请再参阅图1，极片11上还设有极耳60，极耳60通过焊接固定于极片11上。可以理解的是，在其他实施方式中，极片11和极耳60还可为一体成型结构。
电化学装置100还包括壳体(图未示)，电极组件10容纳于壳体中。第一粘接件20、设于第一弯折段14外表面的第二粘接件30和设于第二弯折段16外表面的第三粘接件40也可以粘接于壳体上。而在第二粘接件30设于第一弯折段中最外圈集流体141、第三粘接件40设于第二弯折段中最外圈集流体161上时，可以仅通过第一粘接件20与壳体粘接。
电极组件10通过第一粘接件20、第二粘接件30和第三粘接件40粘接于壳体上，可避免电极组件10在受到外部冲击时失效，提高电极组件10的安全性。
本申请还包括一种电子装置(图未示)，该电子装置包括上述的电化学装置100，具体的，该电子装置可为手机、数码产品、平板、可穿戴设备、无人机、电动工具、储能装置、电动汽车等。
在一实施方式中，隔膜12由聚丙烯膜或聚乙烯膜制成。
在一实施方式中，隔膜12采用聚丙烯膜制成。相较于聚乙烯膜，聚丙烯膜的成本低，但其强度低。通过采用聚丙烯膜制作隔膜12，能够降低40％～60％的成本，对于降低电化学装置100整体成本很显著。通过设置隔膜12收尾卷绕1至5圈，并设置第一粘接件和第二粘接件，可以增强聚丙烯膜的强度，提高安全可靠性和使用寿命。
综上所述，本申请提供的电化学装置100通过使得隔膜12的收尾端继续围绕电极组件10卷绕1至5圈，能够进一步在电极组件10在受到外部冲击力时进行保护，避免电极组件10内部的隔膜12出现破损。同时，在电极组件10的外表面设置第一粘接件20，在第一弯折段14的外表面或第一弯折段中最外圈集流体141的外表面设置第二粘接件30，可以提升电极组件10中隔膜的强度，进一步提升电化学装置100通过安全性能测试的通过率，提升安全性和使用寿命。
另外，本技术领域的普通技术人员应当认识到，以上的实施方 式仅是用来说明本发明，而并非用作为对本发明的限定，只要在本发明的实质精神范围之内，对以上实施例所作的适当改变和变化都落在本发明要求保护的范围之内。

Claims (18)

  1. 一种电化学装置，包括电极组件、第一粘接件和第二粘接件，
    所述电极组件包括极片和隔膜，所述极片和所述隔膜依次层叠卷绕形成所述电极组件，所述极片包括集流体，所述电极组件包括相互连接的第一平直段和第一弯折段，
    其中，沿卷绕方向，所述隔膜的收尾端超出所述集流体的收尾端1至5圈，所述第一粘接件设于所述第一平直段的外表面，所述第二粘接件设于所述第一弯折段的外表面或第一弯折段中最外圈集流体的外表面。
  2. 如权利要求1所述的电化学装置，其中，所述第二粘接件设于所述第一弯折段的外表面，所述第二粘接件包括第一延伸部，所述第一延伸部设于所述第一平直段的外表面。
  3. 如权利要求1所述的电化学装置，其中，所述第二粘接件设于所述第一弯折段中最外圈集流体的外表面，所述第二粘接件包括第一延伸部，所述第一延伸部设于第一平直段中最外圈集流体的外表面。
  4. 如权利要求2或3所述的电化学装置，其中，沿卷绕方向，所述第一延伸部的宽度W 1满足0mm<W 1≤5mm。
  5. 如权利要求2所述的电化学装置，其中，所述电极组件还包括第二平直段，所述第二平直段与所述第一弯折段连接，
    所述第二粘接件还包括第二延伸部，所述第二延伸部设于所述第二平直段的外表面。
  6. 如权利要求3所述的电化学装置，其中，所述电极组件还包括第二平直段，所述第二平直段与所述第一弯折段连接，所述第二粘接件还包括第二延伸部，所述第二延伸部设于第二平直段中最外圈集流体的外表面。
  7. 如权利要求5所述的电化学装置，其中，所述电化学装置还 包括第三粘接件，
    所述电极组件还包括第二弯折段，所述第二弯折段的两端分别与所述第一平直段和所述第二平直段连接，
    所述第三粘接件设于所述第二弯折段的外表面。
  8. 如权利要求6所述的电化学装置，其中，所述电化学装置还包括第三粘接件，
    所述电极组件还包括第二弯折段，所述第二弯折段的两端分别与所述第一平直段和所述第二平直段连接，
    所述第三粘接件设于第二弯折段中最外圈集流体的外表面。
  9. 如权利要求1所述的电化学装置，其中，沿卷绕方向，所述第一粘接件的宽度W 2满足5mm≤W 2≤50mm。
  10. 如权利要求1所述的电化学装置，其中，沿垂直卷绕方向，隔膜的宽度W 3与所述第一粘接件的长度L 2满足10mm≤W 3-L 2≤30mm。
  11. 如权利要求2所述的电化学装置，其中，所述电化学装置还包括第四粘接件，所述第四粘接件粘接所述第一平直段中最外圈集流体的外表面和与所述第一平直段中最外圈集流体的外表面相对的所述隔膜。
  12. 如权利要求11所述的电化学装置，其中，沿卷绕方向，所述隔膜的收尾端超出所述集流体的收尾端1圈。
  13. 如权利要求11所述的电化学装置，其中，所述第四粘接件覆盖所述第一粘接件在所述第四粘接件所在平面的投影。
  14. 如权利要求13所述的电化学装置，其中，沿卷绕方向，所述第四粘接件的宽度W 4与第一粘接件的宽度W 2满足4mm≤W 4-W 2≤10mm。
  15. 如权利要求13所述的电化学装置，其中，沿垂直卷绕方向，所述第四粘接件的长度L 4与第一粘接件的长度L 2满足4mm≤L 4-L 2 ≤10mm。
  16. 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壳体，所述电极组件容纳于所述壳体中，所述第一粘接件与所述壳体粘接。
  17. 如权利要求1所述的电化学装置，其中，所述隔膜为聚丙烯隔膜。
  18. 一种电子装置，其包括权利要求1所述的电化学装置。
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