WO2021189318A1 - 电化学装置及电子装置 - Google Patents

电化学装置及电子装置 Download PDF

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Publication number
WO2021189318A1
WO2021189318A1 PCT/CN2020/081185 CN2020081185W WO2021189318A1 WO 2021189318 A1 WO2021189318 A1 WO 2021189318A1 CN 2020081185 W CN2020081185 W CN 2020081185W WO 2021189318 A1 WO2021189318 A1 WO 2021189318A1
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Prior art keywords
area
electrode assembly
pole piece
electrochemical device
tab
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PCT/CN2020/081185
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English (en)
French (fr)
Inventor
江静
Original Assignee
东莞新能安科技有限公司
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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 CN202080011314.5A priority Critical patent/CN113632313B/zh
Priority to EP20926604.8A priority patent/EP4142038A4/en
Priority to PCT/CN2020/081185 priority patent/WO2021189318A1/zh
Publication of WO2021189318A1 publication Critical patent/WO2021189318A1/zh
Priority to US17/951,191 priority patent/US20230026628A1/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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M10/04—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
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0463—Cells or batteries with horizontal or inclined 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
    • H01M10/05—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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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
    • H01M10/42—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This application relates to the field of energy storage technology, and in particular to an electrochemical device and an electronic device using the electrochemical device.
  • Electrochemical devices are increasingly used in various fields, and consumers' demand for electrochemical devices with high energy density continues to grow, but the energy density of existing electrochemical devices is still insufficient to meet the needs of consumers.
  • the prior art has made an attempt to use the space inside the electrochemical device to increase the energy density.
  • An electrochemical device taking a secondary battery as an example, the secondary battery roughly includes a jelly-roll electrode assembly or a stacked electrode assembly.
  • the structure of the jelly-roll electrode assembly has the following structure: a long plate-shaped positive electrode of active material
  • the sheet and the long-plate-shaped negative electrode sheet are wound in a state where the separator is disposed between the positive electrode sheet and the negative electrode sheet;
  • the structure of the stacked electrode assembly has the following structure: The separators are sequentially stacked in a state in which each of the positive electrode tabs and the negative electrode tabs are interposed.
  • the jelly-roll multi-pole electrode assembly or the stacked multi-pole electrode assembly usually needs to extend the tab from the electrode sheet (positive electrode sheet, negative electrode sheet) for electrical lead-out, and The ears are repeatedly bent inside the battery, which will take up more space inside the battery and reduce the energy density.
  • the tab and the current collector are integrally formed, there is a thinned area on the lead-out side of the tab due to the manufacturing process, but the thinned area is between the positive electrode, separator, and negative electrode. Excessively large gaps will lead to poor interface contact, leading to an increase in the risk of lithium evolution.
  • An embodiment of the present application provides an electrochemical device, including an electrode assembly, the electrode assembly includes a first pole piece and a first tab group electrically connected to the first pole piece, and one end of the electrode assembly includes a multiplexing area.
  • the first pole piece includes a first area located at one end of the first pole piece and a second area connected to the first area. The thickness of the first area is smaller than the thickness of the second area, and the first area is arranged in the reuse area.
  • the first tab group includes a first connecting portion located at an end of the first tab and a first bending portion connected to the first connecting portion and located on a side surface of the electrode assembly, and the first bending portion is arranged in the reuse area.
  • the electrode assembly is drawn out and then bent toward the thinned area on the side of the electrode assembly.
  • the bent electrode assembly squeezes the reuse area, on the one hand, makes the adjacent electrode pieces in the reuse area The distance between them is reduced, the interface contact becomes better, the kinetics is improved, and the risk of lithium evolution is reduced; on the other hand, the internal space utilization rate of the chemical device of the electrode assembly can be improved to increase the energy density.
  • the electrode assembly further includes a second electrode piece and a second electrode lug group electrically connected to the second electrode piece.
  • the second pole piece includes a third area at one end of the second pole piece and a fourth area connected to the third area.
  • the thickness of the third area is smaller than the thickness of the fourth area, and the third area is arranged in the reuse area.
  • the second tab group includes a second connecting portion located at one end of the second tab and a second bending portion connected to the second connecting portion and located on the side surface of the electrode assembly, and the second bending portion is arranged in the reuse area.
  • the multiple first regions and the multiple third regions squeeze each other along the thickness direction of the electrode assembly, so that the distance between the first pole piece and the second pole piece located in the multiplexing area is reduced, the interface contact becomes better, and the dynamics Increase the risk of lithium precipitation.
  • first bending portion and the second bending portion are respectively located on two opposite sides of the electrode assembly.
  • the first bending part and the second bending part are arranged on two different and opposite sides, which can further squeeze the electrode assembly in the reuse area of the electrode assembly, and further improve the energy density of the electrochemical device.
  • the length of the first pole piece arranged in the multiplexing area is greater than the length of the second pole piece arranged in the multiplexing area.
  • the lithium extracted from the cathode during the charging and discharging process of the electrochemical device has enough space to be inserted in the anode to prevent lithium evolution; on the other hand, the reuse area has a larger volume, so that the reuse area can hold a larger volume. Large first bending portion or second bending portion or other elements.
  • the width of the first region is not less than the length of the first bending portion.
  • the first bending part can be completely arranged in the reuse area, which improves the space utilization rate inside the electrochemical device.
  • the thickness of the first bending part is h1
  • the sum of the thickness of the first region is h3
  • the sum of the thickness of the second region is h2, which satisfies the relationship: h1 ⁇ ( h2-h3).
  • the electrochemical device further includes an adapter sheet, the first end of the adapter sheet is electrically connected to the first bending part, and the first end is not bent.
  • the first end portion of the adapter sheet is electrically connected to the first bending portion to realize signal extraction.
  • the first bending portion is not bent, which can further reduce the thickness of the electrochemical device and increase the energy density.
  • the surfaces of the first bending portion and the first end portion are provided with an insulating layer.
  • the insulating layer can be used to prevent leakage caused by welding burrs piercing the outer packaging film of the electrode assembly or short circuits caused by piercing the diaphragm.
  • the thickness of the first end portion is h4 and the number is n4, which satisfies the relationship: h4 ⁇ n4+h1 ⁇ (h2-h3).
  • An electronic device includes the aforementioned electrochemical device.
  • FIG. 1 is a three-dimensional schematic diagram of the electrochemical device according to the first embodiment of the application.
  • FIG. 2 is a three-dimensional schematic diagram of the electrode assembly of the electrochemical device according to the first embodiment of the application.
  • FIG. 3 is a three-dimensional schematic diagram of the electrode assembly of the electrochemical device according to the first embodiment of the application.
  • FIG. 4 is a schematic plan view of the first pole piece of the electrochemical device according to the first embodiment of the application.
  • FIG. 5 is a schematic cross-sectional view of the electrode assembly of the electrochemical device according to the first embodiment of the application.
  • FIG. 6 is a schematic cross-sectional view of the electrode assembly of the electrochemical device according to the first embodiment of the application.
  • FIG. 7 is a schematic cross-sectional view of the electrode assembly of the electrochemical device according to the first embodiment of the application in a compressed state.
  • FIG. 8 is a three-dimensional schematic diagram of an electrochemical device according to a second embodiment of the application.
  • FIG. 9 is a three-dimensional schematic diagram of the electrode assembly of the electrochemical device according to the second embodiment of the application.
  • FIG. 10 is a three-dimensional schematic diagram of the electrode assembly of the electrochemical device according to the second embodiment of the application.
  • FIG. 11 is a schematic plan view of the first pole piece of the electrochemical device according to the first embodiment of the application.
  • FIG. 12 is a schematic cross-sectional view of the electrode assembly of the electrochemical device according to the second embodiment of the application.
  • FIG. 13 is a schematic cross-sectional view of an electrode assembly of an electrochemical device according to a second embodiment of the application.
  • FIG. 14 is a schematic cross-sectional view of the electrode assembly of the electrochemical device according to the second embodiment of the application in a compressed state.
  • FIG. 15 is a three-dimensional schematic diagram of an electronic device according to a third embodiment of the application.
  • the second bending department 142, 242 The second bending department 142, 242
  • FIG. 1 it is a three-dimensional schematic diagram of the electrochemical device 102 provided by the first embodiment of this application.
  • the electrochemical device 102 includes, for example, an electrode assembly 10 (not shown in the figure), the inside of the electrochemical device 102 is filled with an electrolyte (not shown in the figure), and the electrolyte infiltrates the electrode assembly 10.
  • an electrode assembly 10 provided by the first embodiment of this application.
  • the electrode assembly 10 includes a first pole piece 11 and a first tab group 13 connected to the first pole piece 11.
  • the electrode assembly 10 may also include a plurality of first pole pieces 11 and at least for isolating the plurality of first pole pieces 11 Isolation film.
  • the electrode assembly 10 is a laminated electrode assembly, and a plurality of first pole pieces 11 are stacked and arranged at intervals.
  • the electrode assembly 10 is a wound electrode assembly, the first pole piece 11 is arranged in a winding manner, and the lugs are arranged every half circle or one circle, which can be based on the actual application magnification Need to be adjusted.
  • At least one end of the electrode assembly 10 includes a reusing area 19, and the reusing area 19 is provided at one end of the electrode assembly 10.
  • the reuse area 19 includes at least the area where the thinned part of the pole piece is stacked in the electrode assembly 10.
  • the thinned part is the part located at one end of the pole piece and whose thickness is smaller than the other area of the pole piece.
  • the thickness of the thinned part can be perpendicular to the thickness of the pole piece. The direction gradually decreases or increases.
  • the first pole piece 11 includes a first area 111 located at one end of the first pole piece 11 and a second area 112 connected to the first area 111.
  • the thickness of the first area 111 is smaller than the thickness of the second area 112, and the first area 111 is disposed at Within the reuse area 19. That is, the first area 111 is a thinned portion.
  • the first regions 111 of the first pole piece 11 are squeezed against each other along the thickness direction of the electrode assembly 10, so that the distance between the pole pieces located in the multiplexing area 19 is reduced, the interface contact becomes better, and the dynamics Increase the risk of lithium precipitation.
  • the thickness direction refers to the direction of the facet of the electrochemical device 102 or the electrode assembly 10.
  • the first tab group 13 includes a first connecting portion 131 located at one end of the first pole piece 11 and a first bending portion 132 connected to the first connecting portion 131 and located on the side of the electrode assembly 10 (ie, the large surface of the electrode assembly 10) ,
  • the first bending portion 132 is disposed in the reuse area 19.
  • the first tab group 13 includes a plurality of first tabs, and each first tab can be formed by a current collector of a first pole piece 11 extending outward, and the first tab can be formed by a first pole piece.
  • the first area 111 of 11 extends in a direction away from the second area 112.
  • the first tab set 13 is bent once and arranged in the same direction as the end surface of the electrode assembly 10, and this part is the first connecting portion 131, and the first tab set 13 extends along the end surface of the electrode assembly 10. To the side of the electrode assembly 10 and bend to the side, this part is the first bending portion 132.
  • the first tab set 13 only needs to be bent at least twice during the setting process, which reduces the number of bending times of the first tab set 13 and avoids the possibility of multiple bending of the first tab set 13 Problems such as breakage can improve the reliability of the first electrode group 13.
  • the first bending portion 132 is located on the side of the electrode assembly 10, which reduces the space occupation on the tab side of the electrode assembly 10 and improves the energy density.
  • the electrode assembly 10 further includes a second pole piece 12 and a second electrode set 14 connected to the second pole piece 12.
  • the electrode assembly 10 may also include a plurality of second pole pieces 12, each of the first pole pieces 12
  • the pieces 11 and a second pole piece 12 are arranged adjacently and spaced apart, and each second pole piece 12 is arranged adjacently and spaced apart from a first pole piece 11, and a first pole piece 11 and a second pole piece 12 can be arranged between There is a spacer film.
  • the second pole piece 12 includes a third area 121 at one end of the second pole piece 12 and a fourth area 122 connected to the third area 121.
  • the thickness of the third area 121 is smaller than the thickness of the fourth area 122.
  • the third area 121 is provided in the multiplexing area 19.
  • At least part of the first pole piece 11 and the second pole piece 12 arranged at intervals are extruded along the thickness direction of the electrode assembly 10.
  • it may be a plurality of first regions 111 and a plurality of third regions. 121 are squeezed along the thickness direction of the electrode assembly 10, so that the distance between the first pole piece 11 and the second pole piece 12 located in the reuse area 19 is reduced, the interface contact becomes better, the dynamics is improved, and the risk of lithium evolution is reduced .
  • the second tab group 14 includes a second connecting portion 141 located at one end of the second pole piece 12 and a second bending portion 142 connected to the second connecting portion 141 and located on the side of the electrode assembly 10.
  • the folded portion 142 is provided in the reuse area 19.
  • the second tab group 14 includes a plurality of second tabs, and each second tab can be formed by a current collector of a second pole piece 12 extending outward, and the second tab can be formed by a second pole piece.
  • the third area 121 of 12 is formed to extend in a direction away from the fourth area 122.
  • the second tab set 14 is bent once and arranged along the same direction of the end surface of the electrode assembly 10.
  • This part is the second connecting portion 141, and the second tab set 14 extends along the end surface of the electrode assembly 10.
  • this part is the second bent portion 142.
  • the second tab set 14 only needs to be bent at least twice during the installation process, which reduces the number of bending times of the second tab set 14 and avoids possible causes of the second tab set 14 due to multiple bendings. Problems such as breakage improve the reliability of the second tab assembly 14.
  • the second bending portion 142 is located on the side of the electrode assembly 10, which reduces the space occupation on the tab side of the electrode assembly 10 and improves the energy density.
  • first tab group 13 and the second tab group 14 can be located at the same end of the electrode assembly 10. In other embodiments, the first tab 13 and the second tab 14 can be located at the electrode assembly, respectively. 10 opposite ends.
  • the length of the first pole piece 11 disposed in the reusing area 19 is greater than the length of the second pole piece 12 disposed in the reusing area 19, so that the lithium removed from the cathode of the electrode assembly 10 is in the anode during charging and discharging. There is enough space for insertion to prevent lithium evolution.
  • the lengths between the first pole piece 11 and the second pole piece 12 disposed in the reusing area 19 are different, so that the first pole piece 11 and the second pole piece 12 can have a tighter structure during the process of squeezing each other, and further
  • the reuse area 19 is made to have a larger volume, so that the reuse area 19 can accommodate the first tab group 13 or the second tab group 14 or other elements with a larger volume, and the space utilization rate is further improved.
  • the width of the first area 111 is not less than the length of the first bending portion 132, and the width of the third area 121 is not less than the length of the second bending portion 142.
  • the first tab group 13 and the second tab group 14 are arranged corresponding to the first area 111 and the third area 121, and the length of the first tab group 13 and the second tab group 14 arranged on the side of the electrode assembly 10 does not exceed the multiplexing
  • the area 19 corresponds to the length of the side of the electrode assembly 10.
  • the first bending portion 132 and the second bending portion 142 are squeezed toward the inside of the electrode assembly 10, so that the bending accumulation of the first tab group 13 and the second tab group 14 will not take up extra Space to further increase the energy density.
  • the thickness of the first bent portion 132 is h1
  • the sum of the thicknesses of the first region 111 is h3
  • the sum of the thicknesses of the second region 112 is h2.
  • the thickness of the second bent portion 142 is h6, the sum of the thicknesses of the third region 121 is h9, and the sum of the thicknesses of the fourth region 122 is h8, which satisfies the relationship: h1+h4 ⁇ (h2-h3) +(h8-h9).
  • the electrode assembly 10 further includes an adapter sheet 15.
  • the first end 151 of the adapter sheet 15 is electrically connected to the first bending portion 132 to realize signal extraction.
  • the first end 151 is not bent, which can further reduce the electrochemical device 1 thickness.
  • the adaptor sheet 15 can be welded to the first tab group 13 and the second tab group 14 at one time, or the first tab group 13 and the second tab group 14 can be pre-assembled with the adaptor tab 15 After being welded and fixed, it is welded and fixed with the adapter plate 15 twice, which can prevent the dislocation or uneven welding caused by the movement of the electrode assembly 10 during transportation.
  • the number of adapter plates 15 may be two.
  • the first ends 151 of the two adapter plates 15 are electrically connected to the first bending portion 132 and the second bending portion 142, respectively. None of the ends 151 are bent.
  • the adapter plate 15 is connected to the first tab group 13 or the second tab group 14 and then extends to the outside of the electrode assembly 10 for transmitting the electrical signal of the electrode assembly 10. Area 19.
  • the thickness of the first end 151 of the adapter plate 15 is h4 and the number is n4, which satisfies the relationship: h4 ⁇ n4+h1 ⁇ (h2-h3) or h4 ⁇ n4+h1+h4 ⁇ (h2-h3)+(h8-h9).
  • the surfaces of the first bending portion 132 and the first end portion 151 are provided with an insulating layer 16.
  • at least one side of the welding place between the first end 151 and the first tab group 13 or the second tab group 14 is provided with an insulating layer 16 to prevent welding burrs from piercing the outside of the electrode assembly 10 A short circuit caused by liquid leakage caused by packaging film or puncture of the diaphragm.
  • the outer side of the first tab group 13 or the second tab group 14 may also be provided with an insulating layer 16 to prevent the first tab group 13 and the second tab group 14 from being wound or stacked.
  • the thickness of the insulating layer 16 in the reuse area 19 is h5, which satisfies the relationship: h5+h4 ⁇ n4+h1 ⁇ (h2-h3) or h5+h4 ⁇ n4+h1+h4 ⁇ (h2 -h3)+(h8-h9).
  • first bending portion 132 and the second bending portion 142 are respectively located on two opposite sides of the electrode assembly 10. Bending the first bending portion 132 and the second bending portion 142 in two different directions can prevent the electrode assembly 10 from being short-circuited.
  • FIG. 8 it is a three-dimensional schematic diagram of the electrochemical device 202 provided by the second embodiment of this application.
  • the electrochemical device 202 includes, for example, an electrode assembly 20 (not shown in the figure), the inside of the electrochemical device 202 is filled with an electrolyte (not shown in the figure), and the electrolyte infiltrates the electrode assembly 20.
  • an electrode assembly 20 provided by the second embodiment of this application is provided.
  • the electrode assembly 20 includes a first pole piece 21 and a first tab group 23 connected to the first pole piece 21.
  • the electrode assembly 20 may also include a plurality of first pole pieces 21 and at least for isolating the plurality of first pole pieces 21. Isolation film.
  • the electrode assembly 20 is a laminated electrode assembly, and a plurality of first pole pieces 21 are stacked and arranged at intervals.
  • the electrode assembly 20 is a wound electrode assembly, the first pole piece 21 is arranged in a winding manner, and the lugs are arranged every half circle or one circle, which can be based on the actual application magnification Need to be adjusted.
  • At least one end of the electrode assembly 20 includes a reusing area 29, the reusing area 29 is provided at one end of the electrode assembly 20, and the reusing area 29 includes at least an area where the thinned pole pieces in the electrode assembly 20 are stacked.
  • the thinned part is a part located at one end of the pole piece and whose thickness is smaller than that of other regions of the pole piece. The thickness of the thinned part can be gradually reduced or increased in a direction perpendicular to the thickness of the pole piece.
  • the first pole piece 21 includes a first area 211 located at one end of the first pole piece 21 and a second area 212 connected to the first area 211.
  • the thickness of the first area 211 is smaller than the thickness of the second area 212, and the first area 211 is disposed at Reuse area 29. That is, the first area 111 is a thinned portion.
  • the first regions 211 of the first pole piece 21 are squeezed to each other along the thickness direction of the electrode assembly 10, so that the distance between the pole pieces located in the multiplexing area 29 is reduced, the interface contact becomes better, and the dynamics Increase the risk of lithium precipitation.
  • the thickness direction refers to the direction of the facet of the electrochemical device 202 or the electrode assembly 20.
  • the first tab group 23 includes a first connecting portion 231 located at one end of the first pole piece 21 and a first bending portion 232 connected to the first connecting portion 231 and located on the side of the electrode assembly 20 (ie, the large surface of the electrode assembly 20) , The first bending portion 232 is disposed in the reuse area 29.
  • the first tab group 23 includes a plurality of first tabs, and each first tab can be formed by a current collector of a first pole piece 21 extending outward, and the first tab can be formed by a first pole piece.
  • the first area 211 of 21 extends in a direction away from the second area 212.
  • the first tab set 23 is bent once and arranged along the same direction of the end surface of the electrode assembly 20, and this part is the first connecting portion 231, and the first tab set 23 extends along the end surface of the electrode assembly 20 To the side of the electrode assembly 20 and bend toward the side, this part is the first bending portion 232.
  • the first tab set 23 only needs to be bent at least twice during the setting process, which reduces the number of bending of the first tab set 23 and avoids the possibility of the first tab set 23 being bent multiple times. Problems such as breakage improve the reliability of the first tab assembly 23.
  • the first bent portion 232 is located on the side of the electrode assembly 20, which reduces the space occupation on the tab side of the electrode assembly 20 and improves the energy density.
  • the electrode assembly 20 further includes a second pole piece 22 and a second electrode set 24 connected to the second pole piece 22.
  • the electrode assembly 20 may also include a plurality of second pole pieces 22, each of the first pole pieces 22 The pieces 21 and a second pole piece 22 are arranged adjacently and spaced apart, each second pole piece 22 is arranged adjacently and spaced apart from a first pole piece 21, and a first pole piece 21 and a second pole piece 22 can be arranged between There is a spacer film.
  • the second pole piece 22 includes a third area 221 located at one end of the second pole piece 22 and a fourth area 222 connected to the third area 221.
  • the thickness of the third area 221 is smaller than the thickness of the fourth area 222.
  • the third area 221 is provided in the multiplexing area 29.
  • the first pole piece 21 and the second pole piece 22 arranged at intervals are extruded along the thickness direction of the electrode assembly 20.
  • it may be a plurality of first regions 211 and a plurality of third regions. 221 squeezes each other along the thickness direction of the electrode assembly 20, so that the distance between the first pole piece 21 and the second pole piece 22 located in the reuse area 29 is reduced, the interface contact becomes better, the dynamics is improved, and the risk of lithium evolution is reduced .
  • the thickness direction refers to the direction of the facet in the electrochemical device 202 or the electrode assembly 20.
  • the second tab group 24 includes a second connecting portion 241 located at one end of the second pole piece 22 and a second bending portion 242 connected to the second connecting portion 241 and located on the side of the electrode assembly 20.
  • the folded portion 242 is disposed in the reuse area 29.
  • the second tab group 24 includes a plurality of second tabs, and each second tab can be formed by a current collector of a second tab 22 extending outward, and the second tab can be formed by a second tab
  • the third area 221 of 22 is formed to extend in a direction away from the fourth area 222.
  • the second tab group 24 is bent once and arranged along the same direction of the end surface of the electrode assembly 20, and this part is the second connecting portion 241, and the second tab group 24 extends along the end surface of the electrode assembly 20 To the side of the electrode assembly 20 and bend toward the side, this part is the second bending portion 242.
  • the second tab set 24 only needs to be bent at least twice during the setting process, which reduces the number of bending times of the second tab set 24 and avoids the possibility of the second tab set 24 being bent multiple times. Problems such as breakage improve the reliability of the second tab assembly 24.
  • the second bent portion 242 is located on the side of the electrode assembly 20, which reduces the space occupation on the tab side of the electrode assembly 20 and improves the energy density.
  • first tab group 23 and the second tab group 24 can be located at the same end of the electrode assembly 20. In other embodiments, the first tab 23 and the second tab 24 can be located at the electrode assembly, respectively. 20 opposite ends.
  • the length of the first pole piece 21 disposed in the reusing area 29 is greater than the length of the second pole piece 22 disposed in the reusing area 29, so that the lithium removed from the cathode of the electrode assembly 20 is in the anode during charging and discharging. There is enough space for insertion to prevent lithium evolution.
  • the lengths between the first pole piece 21 and the second pole piece 22 disposed in the reusing area 29 are different, so that the first pole piece 21 and the second pole piece 22 can have a tighter structure during the process of squeezing each other, and further
  • the reusing area 29 has a larger volume, so that the reusing area 29 can accommodate the first tab group 23 or the second tab group 24 or other elements with a larger volume, and the space utilization rate is further improved.
  • the width of the first area 211 is not less than the length of the first bending portion 232, and the width of the third area 221 is not less than the length of the second bending portion 242.
  • the first tab group 23 and the second tab group 24 are arranged corresponding to the first area 211 and the third area 221, and the length of the first tab group 23 and the second tab group 24 disposed on the side of the electrode assembly 20 does not exceed the multiplexing
  • the area 29 corresponds to the length of the side of the electrode assembly 20.
  • the first bending portion 232 and the second bending portion 242 are squeezed toward the inside of the electrode assembly 20, so that the bending accumulation of the first tab group 23 and the second tab group 24 will not take up extra Space to further increase the energy density.
  • the thickness of the first bent portion 232 is h1
  • the sum of the thicknesses of the first region 211 is h3
  • the sum of the thicknesses of the second region 212 is h2 , Which satisfies the relationship: h1 ⁇ (h2-h3).
  • the thickness of the second bent portion 242 is h6, the sum of the thickness of the third region 221 is h9, and the sum of the thickness of the fourth region 222 is h8, which satisfies the relationship: h1+h4 ⁇ (h2-h3) +(h8-h9).
  • the electrode assembly 20 further includes an adapter plate 25.
  • the first end 251 of the adapter plate 25 is electrically connected to the first bending portion 232 to realize signal transmission.
  • the first end 251 is not bent, which can further reduce the electrochemical device. 2 thickness.
  • the adapter plate 25 can be welded with the first tab group 23 and the second tab group 24 at one time, or the first tab group 23 and the second tab group 24 can be pre-assembled with the adapter plate 25. After welding and fixing, it is welded and fixed again with the adapter plate 25, which can prevent the dislocation or uneven welding caused by the movement of the electrode assembly 20 during transportation.
  • the number of the adapter plates 25 may be two, and the first ends 251 of the two adapter plates 25 are electrically connected to the first bending portion 232 and the second bending portion 242, respectively. The end 251 is not bent.
  • the adapter plate 25 is connected to the first tab group 23 or the second tab group 24 and then extends to the outside of the electrode assembly 20 for transmitting the electrical signal of the electrode assembly 20.
  • the first end 251 of the adapter plate 25 is disposed at the multiplexing Area 29.
  • the thickness of the first end 251 of the adapter plate 25 is h4 and the number is n4, which satisfies the relation: h4 ⁇ n4+h1 ⁇ (h2-h3) or h4 ⁇ n4+h1+h4 ⁇ (h2-h3)+(h8-h9).
  • the surfaces of the first bending portion 232 and the first end portion 251 are provided with an insulating layer 26.
  • at least one side of the welding place between the first end 251 and the first tab group 23 or the second tab group 24 is provided with an insulating layer 26 to prevent welding burrs from piercing the outside of the electrode assembly 20 A short circuit caused by liquid leakage caused by packaging film or puncture of the diaphragm.
  • the outer side of the first tab group 23 or the second tab group 24 may be provided with an insulating layer 26 to prevent the first tab group 23 and the second tab group 24 from being wound or laminated A short circuit caused by the burr piercing the isolation membrane during the process.
  • the thickness of the insulating layer 26 in the reuse area 29 is h5, which satisfies the relationship: h5+h4 ⁇ n4+h1 ⁇ (h2-h3) or h5+h4 ⁇ n4+h1+h4 ⁇ (h2 -h3)+(h8-h9).
  • the first bending portion 232 and the second bending portion 242 are disposed on the same side of the electrode assembly 10, and the first bending portion 232 and the second bending portion 242 are disposed at an insulating interval. Disposing the first bending portion 232 and the second bending portion 242 on the same side of the electrode assembly 10 can reduce the bending process and improve the yield of the overall process, on the other hand, it can make the first pole piece 21 and the second pole piece 21 and the second pole piece 21 The sheet 22 is squeezed to the same side of the electrode assembly 20, so that the space for accommodating the first bending portion 232 and the second bending portion 242 in the reuse area 29 is larger, and the space utilization rate and energy density are further improved.
  • FIG. 15 it is a three-dimensional schematic diagram of the electronic device 1 provided by the third embodiment of this application.
  • the present application also provides an electronic device 1, which includes a main body 101 and an electrochemical device 302 disposed in the main body 101.
  • the electrochemical device 302 may be the electrochemical device shown in the first embodiment or the second embodiment.
  • the electronic device 1 is a mobile phone as an example.
  • the electronic device 1 may also be a wearable device, a drone, a personal computer, a smart home appliance, an industrial controller, an energy storage device, and a power tool. Or electric cars, etc.

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Abstract

一种电化学装置，包括电极组件，电极组件包括第一极片和电连接第一极片的第一极耳组，电极组件的一端包括复用区域。第一极片包括位于第一极片端部的第一区域及连接第一区域的第二区域，第一区域的厚度小于第二区域的厚度，第一区域设置于复用区域内。第一极耳组包括位于第一极耳端部的第一连接部和连接第一连接部并位于电极组件侧面的第一弯折部，第一弯折部设置于复用区域内。本申请还提供应用所述电化学装置的电子装置。本申请的电化学装置一方面可以改善界面接触效果，降低析锂风险；另一方面可以充分利用电化学装置内部空间，提升能量密度。

Description

电化学装置及电子装置 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应用所述电化学装置的电子装置。
背景技术
电化学装置越来越多地应用于各个领域，消费者对于具有高能量密度的电化学装置需求持续增长，但现有的电化学装置的能量密度仍不足以满足消费者的需求。为了解决上述问题，现有技术已经做出了使用电化学装置内部的空间以提高能量密度的尝试。
电化学装置，以二次电池为例，二次电池大致包括卷芯型(jelly-roll)电极组件或堆叠型电极组件，卷芯型电极组件的构造具有如下结构：活性材料的长板形正极片和长板形负极片以隔离膜设置于正极片与负极片之间的状态卷绕；堆叠型电极组件的构造具有如下结构：预定尺寸的多个正极片和预定尺寸的多个负极片以隔离膜各自介于正极片和负极片之间的状态依次地堆叠。一方面，卷芯型(jelly-roll)多极耳电极组件或堆叠型多极耳电极组件通常需要由电极片(正极片、负极片)中延伸出极耳用于电性导出，并将极耳在电池内部反复弯折，如此会占用较多的电池内部空间、能量密度降低。另一方面，对于极耳与集流体一体成型的多极耳二次电池而言，由于制程原因极片极耳引出侧存在削薄区域，但削薄区正极片、隔离膜、负极片之间的间隙过大将会导致界面接触不良，从而导致析锂风险的提升。
如何解决上述问题，是本领域技术人员需要考虑的。
发明内容
本申请至少解决上述现有技术中存在的一个技术问题。
本申请实施例提供一种电化学装置，包括电极组件，电极组件包括第一极片和电连接第一极片的第一极耳组，电极组件的一端包括复用区域。第一极片包括位于第一极片一端的第一区域及连接第一区域的第二区域，第一区域的厚度小于第二区域的厚度，第一区域设置于复用区域内。第一极耳组包括位于第一极耳端部的第一连接部和连接第一连接部并位于电极组件侧面的第一弯折部，第一弯折部设置于复用区域内。
本申请的电化学装置，将极耳组引出后向电极组件侧面的削薄区进行弯折，弯折后的极耳组挤压复用区域，一方面使得复用区域内相邻的极片之间的间距减小，界面接触变好，动力学提高，析锂风险降低；另一方面可以提升电极组件化学装置内部空间利用率以提升能量密度。
进一步的，电极组件还包括第二极片和电连接第二极片的第二极耳组。第二极片包括位于第二极片一端的第三区域及连接第三区域的第四区域，第三区域的厚度小于第四区域的厚度，第三区域设置于复用区域内。第二极耳组包括位于第二极耳一端的第二连接部和连接第二连接部并位于电极组件侧面的第二弯折部，第二弯折部设置于复用区域内。多个第一区域与多个第三区域沿电极组件的厚度方向相互挤压，使得位于复用区域的第一极片及第二极片之间的间距减小，界面接触变好，动力学提高，析锂风险降低。
进一步的，第一弯折部和第二弯折部分别位于电极组件相对的 两个侧面。第一弯折部及第二弯折部设置于两个不同且相对的侧面，可进一步挤压电极组件的复用区域电极组件，进一步提升电化学装置的能量密度。
进一步的，第一极片设置于复用区域的长度大于第二极片设置于复用区域的长度。一方面，可使得电化学装置在充放电过程中阴极脱出的锂在阳极有足够空间嵌入进而防止析锂；另一方面，使得复用区域具有更大的体积，使得复用区域可以容纳体积更大的第一弯折部或第二弯折部或其他元件。
进一步的，第一区域的宽度不小于第一弯折部的长度。第一弯折部可完全设置于复用区域中，提升电化学装置内部的空间利用率。
进一步的，沿电化学装置的厚度方向上，第一弯折部的厚度为h1，第一区域的厚度之和为h3，第二区域的厚度之和为h2，其满足关系式：h1≤(h2-h3)。如此设置，可以充分利用电化学装置的内部空间，且不增加电化学装置的厚度，可以提高能量密度以及保证电化学装置外表面的平整。
进一步的，电化学装置还包括转接片，转接片的第一端部与第一弯折部电性连接，第一端部不弯折。转接片的第一端部与第一弯折部电性连接以实现信号引出，第一弯折部不弯折可进一步降低电化学装置的厚度，提高能量密度。
进一步的，第一弯折部及第一端部的表面设置有绝缘层。绝缘层可用于防止焊接毛刺刺破电极组件外部的包装膜而引发的漏液或刺破隔膜等引发的短路。
进一步的，第一端部的厚度为h4、数量为n4，其满足关系式：h4×n4+h1≤(h2-h3)。如此设置，可以进一步充分利用电化学装置 内部空间以及控制电化学装置厚度，提高能量密度和保证外表面平整。
一种电子装置，其包括前述的电化学装置。
附图说明
图1为本申请第一实施例的电化学装置的立体示意图。
图2为本申请第一实施例的电化学装置的电极组件的立体示意图。
图3为本申请第一实施例的电化学装置的电极组件的立体示意图。
图4为本申请第一实施例的电化学装置的第一极片的平面示意图。
图5为本申请第一实施例的电化学装置的电极组件的截面示意图。
图6为本申请第一实施例的电化学装置的电极组件的截面示意图。
图7为本申请第一实施例的电化学装置的电极组件挤压状态的截面示意图。
图8为本申请第二实施例的电化学装置的立体示意图。
图9为本申请第二实施例的电化学装置的电极组件的立体示意图。
图10为本申请第二实施例的电化学装置的电极组件的立体示意图。
图11为本申请第一实施例的电化学装置的第一极片的平面示意图。
图12为本申请第二实施例的电化学装置的电极组件的截面示意图。
图13为本申请第二实施例的电化学装置的电极组件的截面示意图。
图14为本申请第二实施例的电化学装置的电极组件挤压状态的截面示意图。
图15为本申请第三实施例的电子装置的立体示意图。
主要元件符号说明
电子装置                        1
本体                            101
电化学装置                      102、202、302
电极组件                        10、20
第一极片                        11、21
第一区域                        111、211
第二区域                        112、212
第二极片                        12、22
第三区域                        121、221
第四区域                        122、222
第一极耳组                      13、23
第一连接部                      131、231
第一弯折部                      132、232
第二极耳组                      14、24
第二连接部                      141、241
第二弯折部                       142、242
转接片                           15、25
第一端部                         151、251
绝缘层                           16、26
复用区域                         19、29
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
以下描述将参考附图以更全面地描述本申请内容。附图中所示为本申请的示例性实施例。然而，本申请可以以许多不同的形式来实施，并且不应该被解释为限于在此阐述的示例性实施例。提供这些示例性实施例是为了使本申请透彻和完整，并且将本申请的范围充分地传达给本领域技术人员。类似的附图标记表示相同或类似的组件。
本文使用的术语仅用于描述特定示例性实施例的目的，而不意图限制本申请。如本文所使用的，除非上下文另外清楚地指出，否则单数形式“一”，“一个”和“该”旨在也包括复数形式。此外，当在本文中使用时，“包括”和/或“包含”或“包括”和/或“包括”或“具有”和/或“具有”，整数，步骤，操作，组件和/或组件，但不排除存在或添加一个或多个其它特征，区域，整数，步骤，操作，组件，组件和/或其群组。
除非另外定义，否则本文使用的所有术语(包括技术和科学术语)具有与本申请所属领域的普通技术人员通常理解的相同的含义。此外，除非文中明确定义，诸如在通用字典中定义的那些术语应该 被解释为具有与其在相关技术和本申请内容中的含义一致的含义，并且将不被解释为理想化或过于正式的含义。
以下内容将结合附图对示例性实施例进行描述。须注意的是，参考附图中所描绘的组件不一定按比例显示；而相同或类似的组件将被赋予相同或相似的附图标记表示或类似的技术用语。
下面参照附图，对本申请的具体实施方式作进一步的详细描述。
第一实施例
如图1所示，为本申请第一实施例提供的电化学装置102的立体示意图。电化学装置102包括如电极组件10(图中未示出)，电化学装置102内部填充有电解质(图中未示出)，电解质浸润电极组件10。
如图2和图3所示，为本申请第一实施例提供的一种电极组件10。电极组件10包括第一极片11和连接第一极片11的第一极耳组13，电极组件10还可包括多个第一极片11以及至少用于隔离多个第一极片11的隔离膜。
于一实施例中，如图2所示，电极组件10为叠片式电极组件，多个第一极片11间隔堆叠设置。于一实施例中，如图3所示，电极组件10为卷绕式电极组件，第一极片11以卷绕的方式设置，每半圈设置或一圈设置极耳，可根据实际应用倍率需求进行调整。
如图5所示，电极组件10的至少一端包括复用区域19，复用区域19设置于电极组件10的一端。复用区域19至少包括电极组件10中极片削薄部分堆叠设置的区域，削薄部分为位于极片一端且厚度小于极片其他区域的部分，削薄部分的厚度可沿垂直于极片厚度的方向逐渐减小或增大。
第一极片11包括位于第一极片11一端的第一区域111及连接第一区域111的第二区域112，第一区域111的厚度小于第二区域112的厚度，第一区域111设置于复用区域19内。即第一区域111为削薄部分。
应当理解的是，在极片制造过程中，涂覆活性物质时，由于大多数的浆料呈现液体状态而具有流动性，这就导致极片上靠近极耳伸出的位置因活性物质少而厚度较薄。
于一实施例中，第一极片11的第一区域111沿电极组件10的厚度方向相互挤压，使得位于复用区域19的极片之间的间距减小，界面接触变好，动力学提高，析锂风险降低。所述厚度方向指电化学装置102或电极组件10的小面的方向。
第一极耳组13包括位于第一极片11一端的第一连接部131和连接第一连接部131并位于电极组件10侧面(即，电极组件10的大面)的第一弯折部132，第一弯折部132设置于复用区域19内。
于一实施例中，第一极耳组13包括多个第一极耳，每个第一极耳可由一个第一极片11的集流体向外延伸形成，第一极耳可由第一极片11的第一区域111向远离第二区域112的方向延伸形成。
于一实施例中，第一极耳组13一次弯折并沿电极组件10的端面的同一方向设置，该部分即为第一连接部131，第一极耳组13沿电极组件10的端面延伸至电极组件10的侧面并向侧面弯折设置，该部分即为第一弯折部132。
在本申请中，第一极耳组13在设置过程中仅需最少两次必要弯折，减少第一极耳组13弯折次数，避免第一极耳组13因多次弯折可能导致的断裂等问题，提升第一极耳组13的可靠性。同时第一弯 折部132位于电极组件10侧面，减小了电极组件10极耳侧的空间占用，提升了能量密度。
于一实施例中，电极组件10还包括第二极片12和连接第二极片12的第二极耳组14，电极组件10还可包括多个第二极片12，每个第一极片11与一个第二极片12相邻间隔设置，每个第二极片12与一个第一极片11相邻间隔设置，一个第一极片11与一个第二极片12之间可设置有间隔膜。
如图4所示，第二极片12包括位于第二极片12一端的第三区域121及连接第三区域121的第四区域122，第三区域121的厚度小于第四区域122的厚度，第三区域121设置于复用区域19内。
于一实施例中，间隔设置的第一极片11及第二极片12的至少部分沿电极组件10的厚度方向相互挤压，具体可以为，多个第一区域111与多个第三区域121沿电极组件10的厚度方向相互挤压，使得位于复用区域19的第一极片11及第二极片12之间的间距减小，界面接触变好，动力学提高，析锂风险降低。
如图6所示，第二极耳组14包括位于第二极片12一端的第二连接部141和连接第二连接部141并位于电极组件10侧面的第二弯折部142，第二弯折部142设置于复用区域19内。
于一实施例中，第二极耳组14包括多个第二极耳，每个第二极耳可由一个第二极片12的集流体向外延伸形成，第二极耳可由第二极片12的第三区域121向远离第四区域122的方向延伸形成。
于一实施例中，第二极耳组14一次弯折并沿电极组件10的端面的同一方向设置，该部分即为第二连接部141，第二极耳组14沿电极组件10的端面延伸至电极组件10的侧面并向侧面弯折设置， 该部分即为第二弯折部142。在本申请中，第二极耳组14在设置过程中仅需最少两次必要弯折，减少第二极耳组14弯折次数，避免第二极耳组14因多次弯折可能导致的断裂等问题，提升第二极耳组14的可靠性。同时第二弯折部142位于电极组件10侧面，减小了电极组件10极耳侧的空间占用，提升了能量密度。
于一实施例中，第一极耳组13及第二极耳组14可位于电极组件10的同一端，在其他实施例中，第一极耳13及第二极耳14可分别位于电极组件10相背的两端。
于一实施例中，第一极片11设置于复用区域19的长度大于第二极片12设置于复用区域19的长度，可使得电极组件10在充放电过程中阴极脱出的锂在阳极有足够空间嵌入进而防止析锂。设置于复用区域19的第一极片11及第二极片12之间的长度不相同，使得第一极片11及第二极片12相互挤压过程中可具备更紧密的结构，进一步使得复用区域19具有更大的体积，使得复用区域19可以容纳体积更大的第一极耳组13或第二极耳组14或其他元件，进一步提升空间利用率。
于一实施例中，第一区域111的宽度不小于第一弯折部132的长度，第三区域121的宽度不小于第二弯折部142的长度。第一极耳组13及第二极耳组14对应第一区域111及第三区域121设置，第一极耳组13及第二极耳组14设置于电极组件10侧面的长度不超出复用区域19对应电极组件10侧面的长度。
如图7所示，第一弯折部132及第二弯折部142向电极组件10内部挤压，使得第一极耳组13及第二极耳组14的弯折堆积不会占用额外的空间，进一步提升能量密度。
于一实施例中，在沿所述电极组件10的厚度方向上，第一弯折部132的厚度为h1，第一区域111的厚度之和为h3，第二区域112的厚度之和为h2，其满足关系式：h1≤(h2-h3)。
进一步的，第二弯折部142的厚度为h6，第三区域121的厚度之和为h9，第四区域122的厚度之和为h8，其满足关系式：h1+h4≤(h2-h3)+(h8-h9)。
电极组件10还包括转接片15，转接片15的第一端部151与第一弯折部132电性连接以实现信号引出，第一端部151不弯折，可进一步降低电化学装置1的厚度。
于一实施例中，转接片15可与第一极耳组13及第二极耳组14一次焊接完成，或第一极耳组13及第二极耳组14可与转接片15预先焊接固定后再与转接片15二次焊接完成固定，可防止电极组件10运输过程中因移动而产生的错位或焊接不均。
于一实施例中，转接片15的数量可以为两个，两个转接片15的第一端部151分别于第一弯折部132及第二弯折部142电性连接，第一端部151均不弯折。转接片15与第一极耳组13或第二极耳组14连接后向电极组件10外部延伸用于传递电极组件10的电信号，转接片15的第一端部151设置于复用区域19中。
于一实施例中，转接片15的第一端部151的厚度为h4、数量为n4，其满足关系式：h4×n4+h1≤(h2-h3)或者h4×n4+h1+h4≤(h2-h3)+(h8-h9)。
第一弯折部132及第一端部151的表面设置有绝缘层16。于一实施例中，第一端部151与第一极耳组13或第二极耳组14的焊接处的至少一侧设置有绝缘层16，用于防止焊接毛刺刺破电极组件10 外部的包装膜而引发的漏液或刺破隔膜等引发的短路。
于一实施例中，第一极耳组13或第二极耳组14的外侧也可设置有绝缘层16，用于防止第一极耳组13及第二极耳组14在卷绕或叠片过程中因毛刺刺破隔离膜而引发的短路。
于一实施例中，绝缘层16位于复用区域19的厚度为h5，其满足关系式：h5+h4×n4+h1≤(h2-h3)或者h5+h4×n4+h1+h4≤(h2-h3)+(h8-h9)。
于一实施例中，第一弯折部132和第二弯折部142分别位于电极组件10相背的两个侧面。将第一弯折部132及第二弯折部142向两个不同的方向弯折可避免电极组件10发生短路。
第二实施例
如图8所示，为本申请第二实施例提供的电化学装置202的立体示意图。电化学装置202包括如电极组件20(图中未示出)，电化学装置202内部填充有电解质(图中未示出)，电解质浸润电极组件20。
如图9和图10所示，为本申请第二实施例提供的一种电极组件20。电极组件20包括第一极片21和连接第一极片21的第一极耳组23，电极组件20还可包括多个第一极片21以及至少用于隔离多个第一极片21的隔离膜。
于一实施例中，如图9所示，电极组件20为叠片式电极组件，多个第一极片21间隔堆叠设置。于一实施例中，如图10所示，电极组件20为卷绕式电极组件，第一极片21以卷绕的方式设置，每半圈设置或一圈设置极耳，可根据实际应用倍率需求进行调整。
如图12所示，电极组件20的至少一端包括复用区域29，复用 区域29设置于电极组件20的一端，复用区域29至少包括电极组件20中极片削薄部分堆叠设置的区域，削薄部分为位于极片一端且厚度小于极片其他区域的部分，削薄部分的厚度可沿垂直于极片厚度的方向逐渐减小或增大。
应当理解的是，在极片制造过程中，涂覆活性物质时，由于大多数的浆料呈现液体状态而具有流动性，这就导致极片上靠近极耳伸出的位置因活性物质少而厚度较薄。
第一极片21包括位于第一极片21一端的第一区域211及连接第一区域211的第二区域212，第一区域211的厚度小于第二区域212的厚度，第一区域211设置于复用区域29内。即第一区域111为削薄部分。
于一实施例中，第一极片21的第一区域211沿电极组件10的厚度方向相互挤压，使得位于复用区域29的极片之间的间距减小，界面接触变好，动力学提高，析锂风险降低。所述厚度方向指电化学装置202或电极组件20的小面的方向。
第一极耳组23包括位于第一极片21一端的第一连接部231和连接第一连接部231并位于电极组件20侧面(即，电极组件20的大面)的第一弯折部232，第一弯折部232设置于复用区域29内。
于一实施例中，第一极耳组23包括多个第一极耳，每个第一极耳可由一个第一极片21的集流体向外延伸形成，第一极耳可由第一极片21的第一区域211向远离第二区域212的方向延伸形成。
于一实施例中，第一极耳组23一次弯折并沿电极组件20的端面的同一方向设置，该部分即为第一连接部231，第一极耳组23沿电极组件20的端面延伸至电极组件20的侧面并向侧面弯折设置， 该部分即为第一弯折部232。
在本申请中，第一极耳组23在设置过程中仅需最少两次必要弯折，减少第一极耳组23弯折次数，避免第一极耳组23因多次弯折可能导致的断裂等问题，提升第一极耳组23的可靠性，同时第一弯折部232位于电极组件20侧面，减小了电极组件20极耳侧的空间占用，提升了能量密度。
于一实施例中，电极组件20还包括第二极片22和连接第二极片22的第二极耳组24，电极组件20还可包括多个第二极片22，每个第一极片21与一个第二极片22相邻间隔设置，每个第二极片22与一个第一极片21相邻间隔设置，一个第一极片21与一个第二极片22之间可设置有间隔膜。
如图11所示，第二极片22包括位于第二极片22一端的第三区域221及连接第三区域221的第四区域222，第三区域221的厚度小于第四区域222的厚度，第三区域221设置于复用区域29内。
于一实施例中，间隔设置的第一极片21及第二极片22的至少部分沿电极组件20的厚度方向相互挤压，具体可以为，多个第一区域211与多个第三区域221沿电极组件20的厚度方向相互挤压，使得位于复用区域29的第一极片21及第二极片22之间的间距减小，界面接触变好，动力学提高，析锂风险降低。所述厚度方向指电化学装置202或电极组件20中的小面的方向。
如图13所示，第二极耳组24包括位于第二极片22一端的第二连接部241和连接第二连接部241并位于电极组件20侧面的第二弯折部242，第二弯折部242设置于复用区域29内。
于一实施例中，第二极耳组24包括多个第二极耳，每个第二极 耳可由一个第二极片22的集流体向外延伸形成，第二极耳可由第二极片22的第三区域221向远离第四区域222的方向延伸形成。
于一实施例中，第二极耳组24一次弯折并沿电极组件20的端面的同一方向设置，该部分即为第二连接部241，第二极耳组24沿电极组件20的端面延伸至电极组件20的侧面并向侧面弯折设置，该部分即为第二弯折部242。
在本申请中，第二极耳组24在设置过程中仅需最少两次必要弯折，减少第二极耳组24弯折次数，避免第二极耳组24因多次弯折可能导致的断裂等问题，提升第二极耳组24的可靠性，同时第二弯折部242位于电极组件20侧面，减小了电极组件20极耳侧的空间占用，提升了能量密度。
于一实施例中，第一极耳组23及第二极耳组24可位于电极组件20的同一端，在其他实施例中，第一极耳23及第二极耳24可分别位于电极组件20相背的两端。
于一实施例中，第一极片21设置于复用区域29的长度大于第二极片22设置于复用区域29的长度，可使得电极组件20在充放电过程中阴极脱出的锂在阳极有足够空间嵌入进而防止析锂。设置于复用区域29的第一极片21及第二极片22之间的长度不相同，使得第一极片21及第二极片22相互挤压过程中可具备更紧密的结构，进一步使得复用区域29具有更大的体积，使得复用区域29可以容纳体积更大的第一极耳组23或第二极耳组24或其他元件，进一步提升空间利用率。
于一实施例中，第一区域211的宽度不小于第一弯折部232的长度，第三区域221的宽度不小于第二弯折部242的长度。第一极 耳组23及第二极耳组24对应第一区域211及第三区域221设置，第一极耳组23及第二极耳组24设置于电极组件20侧面的长度不超出复用区域29对应电极组件20侧面的长度。
如图14所示，第一弯折部232及第二弯折部242向电极组件20内部挤压，使得第一极耳组23及第二极耳组24的弯折堆积不会占用额外的空间，进一步提升能量密度。
于一实施例中，在沿所述电极组件20的厚度方向上，第一弯折部232的厚度为h1，第一区域211的厚度之和为h3，第二区域212的厚度之和为h2，其满足关系式：h1≤(h2-h3)。
进一步的，第二弯折部242的厚度为h6，第三区域221的厚度之和为h9，第四区域222的厚度之和为h8，其满足关系式：h1+h4≤(h2-h3)+(h8-h9)。
电极组件20还包括转接片25，转接片25的第一端部251与第一弯折部232电性连接以实现信号传输，第一端部251不弯折，可进一步降低电化学装置2的厚度。
于一实施例中，转接片25可与第一极耳组23及第二极耳组24一次焊接完成，或第一极耳组23及第二极耳组24可与转接片25预先焊接固定后再与转接片25二次焊接完成固定，可防止电极组件20运输过程中因移动而产生的错位或焊接不均。
于一实施例中，转接片25的数量可以为两个，两个转接片25的第一端部251分别于第一弯折部232及第二弯折部242电性连接，第一端部251均不弯折。转接片25与第一极耳组23或第二极耳组24连接后向电极组件20外部延伸用于传递电极组件20的电信号，转接片25的第一端部251设置于复用区域29中。
于一实施例中，转接片25的第一端部251的厚度为h4、数量为n4，其满足关系式：h4×n4+h1≤(h2-h3)或者h4×n4+h1+h4≤(h2-h3)+(h8-h9)。
第一弯折部232及第一端部251的表面设置有绝缘层26。于一实施例中，第一端部251与第一极耳组23或第二极耳组24的焊接处的至少一侧设置有绝缘层26，用于防止焊接毛刺刺破电极组件20外部的包装膜而引发的漏液或刺破隔膜等引发的短路。
于一实施例中，第一极耳组23或第二极耳组24的外侧可设置有绝缘层26，用于防止第一极耳组23及第二极耳组24在卷绕或叠片过程中因毛刺刺破隔离膜而引发的短路。
于一实施例中，绝缘层26位于复用区域29的厚度为h5，其满足关系式：h5+h4×n4+h1≤(h2-h3)或者h5+h4×n4+h1+h4≤(h2-h3)+(h8-h9)。
于一实施例中，第一弯折部232和第二弯折部242设置于电极组件10的同一侧，第一弯折部232及第二弯折部242绝缘间隔设置。将第一弯折部232及第二弯折部242设置于电极组件10的同一侧一方面可以减少弯折工艺提升整体制程的良率，另一方面可以使第一极片21及第二极片22向电极组件20的同一侧挤压，使复用区域29的用于容纳第一弯折部232和第二弯折部242的空间更大，进一步提升空间利用率及能量密度。
第三实施例
如图15所示，为本申请第三实施例提供的电子装置1的立体示意图。
本申请还提供一种电子装置1，该电子装置包括本体101及设 置于本体101内的电化学装置302，电化学装置302可以为第一实施例或第二实施例所示的电化学装置。
图13中仅以电子装置1为手机为例，在其它实施例中，该电子装置1也可为可穿戴设备、无人机、个人计算机、智能家电、工业控制器、储能装置、电动工具或电动汽车等。
上文中，参照附图描述了本申请的具体实施方式。但是，本领域中的普通技术人员能够理解，在不偏离本申请的精神和范围的情况下，还可以对本申请的具体实施方式作各种变更和替换。这些变更和替换都落在本申请所限定的范围内。

Claims (10)

  1. 一种电化学装置，包括电极组件，所述电极组件包括第一极片和电连接所述第一极片的第一极耳组，其中，
    所述电极组件的一端包括复用区域；
    所述第一极片包括位于所述第一极片一端的第一区域及连接所述第一区域的第二区域，所述第一区域的厚度小于所述第二区域的厚度，所述第一区域设置于所述复用区域内；
    所述第一极耳组包括位于所述第一极耳一端的第一连接部和连接所述第一连接部并位于所述电极组件侧面的第一弯折部，所述第一弯折部设置于所述复用区域内。
  2. 如权利要求1所述的电化学装置，其中，所述电极组件还包括第二极片和电连接所述第二极片的第二极耳组；
    所述第二极片包括位于所述第二极片一端的第三区域及连接所述第三区域的第四区域，所述第三区域的厚度小于所述第四区域的厚度，所述第三区域设置于所述复用区域内；
    所述第二极耳组包括位于所述第二极耳一端的第二连接部和连接所述第二连接部并位于所述电极组件侧面的第二弯折部，所述第二弯折部设置于所述复用区域内。
  3. 如权利要求2所述的电化学装置，其中，所述第一弯折部和所述第二弯折部分别位于所述电极组件相对的两个侧面。
  4. 如权利要求2所述的电化学装置，其中，所述第一极片设置于所述复用区域的长度大于所述第二极片设置于所述复用区域的长度。
  5. 如权利要求1所述的电化学装置，其中，所述第一区域的宽 度不小于所述第一弯折部的长度。
  6. 如权利要求1所述的电化学装置，其中，在沿所述电化学装置的厚度方向上，所述第一弯折部的厚度为h1，所述第一区域的厚度之和为h3，所述第二区域的厚度之和为h2，其满足关系式：h1≤(h2-h3)。
  7. 如权利要求6所述的电化学装置，其中，还包括转接片，所述转接片的第一端部与所述第一弯折部电性连接，所述第一端部不弯折。
  8. 如权利要求7所述的电化学装置，其中，所述第一弯折部及所述第一端部的表面设置有绝缘层。
  9. 如权利要求7所述的电化学装置，其中，所述第一端部的厚度为h4、数量为n4，其满足关系式：h4×n4+h1≤(h2-h3)。
  10. 一种电子装置，其包括如权利要求1-9任意一项所述的电化学装置。
PCT/CN2020/081185 2020-03-25 2020-03-25 电化学装置及电子装置 WO2021189318A1 (zh)

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