WO2022228194A1 - Cell, energy storage device and electronic apparatus - Google Patents

Cell, energy storage device and electronic apparatus Download PDF

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Publication number
WO2022228194A1
WO2022228194A1 PCT/CN2022/087536 CN2022087536W WO2022228194A1 WO 2022228194 A1 WO2022228194 A1 WO 2022228194A1 CN 2022087536 W CN2022087536 W CN 2022087536W WO 2022228194 A1 WO2022228194 A1 WO 2022228194A1
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WO
WIPO (PCT)
Prior art keywords
electrode sheet
tab
negative electrode
positive electrode
winding structure
Prior art date
Application number
PCT/CN2022/087536
Other languages
French (fr)
Chinese (zh)
Inventor
陈志勇
Original Assignee
广东微电新能源有限公司
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Filing date
Publication date
Application filed by 广东微电新能源有限公司 filed Critical 广东微电新能源有限公司
Publication of WO2022228194A1 publication Critical patent/WO2022228194A1/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
    • H01M10/04—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
    • H01M10/058—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
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to the technical field of energy storage, and more particularly, to a battery cell, an energy storage device and an electronic device.
  • the energy storage device is used to provide energy for the equipment, and the safety of the energy storage device affects the safe use of the equipment.
  • the cells in the energy storage device play an important role in the charging and discharging process, and the safety performance of the cells affects the safety of the energy storage device.
  • the tabs on the cells need to be insulated to prevent the tabs from short-circuiting the cells.
  • insulating tapes are arranged at different positions of the tabs to achieve the insulating effect.
  • the insulating tapes are arranged in multiple positions, which leads to complicated processes, and the gap between different positions easily leads to the problem of insulation failure.
  • An object of the present invention is to provide a battery cell, an energy storage device and an electronic device.
  • a battery cell includes a positive electrode sheet, a negative electrode sheet and two separators;
  • One of the positive electrode sheet and the negative electrode sheet is located between the two separators, and the other is positioned outside one of the separators, and the positive electrode sheet, the negative electrode sheet, and the two separators form a spiral shape the winding structure;
  • the positive electrode sheet and/or the negative electrode sheet are provided with tabs;
  • An insulating layer is also included, and the insulating layer covers the tabs and the part of the positive electrode sheet and/or the negative electrode sheet connected with the tabs.
  • the positive electrode sheet and/or the negative electrode sheet has a first connection portion
  • the tabs are in one-to-one correspondence with the first connection portions
  • the tabs have a second connection portion
  • the second connection portion is The connecting portion is electrically connected to the first connecting portion, and the tab is bent and leans toward the end of the winding structure;
  • the insulating layer is in one-to-one correspondence with the tabs, and the insulating layer covers the side of the tab that is close to the end of the winding structure, and extends to cover the first connecting portion and the the second connecting portion;
  • the side of the tab facing away from the end of the winding structure has an exposed area, and the insulating layer avoids the exposed area.
  • the tab is located at the end of the positive electrode sheet and/or the negative electrode sheet, and the insulating layer covers the end of the positive electrode sheet and/or the negative electrode sheet where the tab is located .
  • a through hole is formed in the middle of the winding structure, and at the starting end of the winding structure, at least one of the isolation films extends into the through hole.
  • the cross-section of the portion of the isolation film located in the through hole is linear or S-shaped.
  • the portion of the isolation membrane located in the through hole extends along the radial direction of the through hole.
  • the tab includes a first tab and a second tab, the first tab is electrically connected to the positive electrode sheet, and the second tab is electrically connected to the negative electrode sheet;
  • the insulating layer includes a first insulating layer and a second insulating layer, the first insulating layer covers the first tab and the part of the positive electrode plate connected to the first tab, the second an insulating layer covers the second tab and the part of the negative electrode sheet connected to the second tab;
  • the first tab is bent and approached to one end of the winding structure
  • the second tab is bent and approached to the other end of the winding structure
  • the first tab and the second tab are
  • the included angle between the projections of the tabs on the cross section of the winding structure is 0°-90°.
  • the two isolation films are folded from a single isolation film.
  • the size of the negative electrode sheet at each end of the winding structure is larger than the size of the positive electrode sheet by more than 0.1 mm.
  • the size of the separator at each end of the winding structure is larger than the size of the negative electrode sheet by more than 0.5 mm.
  • an energy storage device includes the battery cell and the housing as described in the first aspect;
  • the winding structure is arranged in the casing, the casing is welded with the tab, and the welding position has two welding points, and the distance between the two welding points is 0.5mm-5mm.
  • the casing includes an inner casing and an outer casing, the inner casing and the outer casing are both cylindrical structures with one end open, and the outer casing is sleeved over the inner casing to seal the cylindrical structure;
  • a sealing ring is arranged between the inner casing and the outer casing, and the width of the opening of the sealing ring exposing the outer casing is greater than 0.5 mm.
  • the inner shell includes a top plate and a first side wall, and the first side wall is disposed around the top plate to form a cylindrical structure;
  • the housing includes a bottom plate and a second side wall, the second side wall is disposed around the bottom plate to form a cylindrical structure;
  • the second side wall is sleeved outside the first side wall, the sealing ring is arranged between the second side wall and the first side wall, and the first side wall and the second side wall are The area of overlap between the side walls is 10%-90%.
  • an electronic device comprising the energy storage device of the second aspect.
  • One technical effect of the present invention is that, by covering the tabs and the parts of the positive and/or negative tabs connected to the tabs with an insulating layer, the process of insulating the tabs only needs to be performed once, which simplifies the process and provides insulation.
  • the overall coating of the layer forms insulation, which ensures the insulation effect and improves the safety of the use of the cell.
  • FIG. 1 is a cross-sectional view of a cell in one embodiment of the present disclosure.
  • Fig. 2 is a schematic structural diagram of a side surface on which the first tab is disposed on the positive electrode sheet according to an embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of another side of FIG. 2 .
  • FIG. 4 is a schematic structural diagram of a battery cell in an embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of an end face of a cell in an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of a battery cell in another embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a welding point for welding a shell and a tab in an embodiment of the present disclosure.
  • FIG. 8 is a cross-sectional view of an energy storage device in one embodiment of the present disclosure.
  • a battery cell As shown in FIG. 1 , the battery cell includes a positive electrode sheet 1 , a negative electrode sheet 2 and two separators 3 .
  • One of the positive electrode sheet 1 and the negative electrode sheet 2 is located between the two separators 3, and the other is located outside one of the separators 3.
  • the positive electrode sheet 1, the negative electrode sheet 2 and the two separators The isolation films 3 form a helical winding structure 6 .
  • the positive electrode sheet 1 and/or the negative electrode sheet 2 are provided with tabs.
  • An insulating layer 5 is also included, and the insulating layer 5 covers the tabs and the part of the positive electrode sheet 1 and/or the negative electrode sheet 2 connected to the tabs.
  • tabs may be provided on the positive electrode sheet 1 , or tabs may be provided on the negative electrode sheet 2 , or both the positive electrode sheet 1 and the negative electrode sheet 2 may be provided with tabs.
  • the tab and the positive electrode sheet 1 or the negative electrode sheet 2 where the tab is located are covered by an insulating layer 5 to form effective insulation at the position of the tab.
  • structures other than the portion where the tab is connected to the positive electrode sheet 1 or the negative electrode sheet 2 can form effective insulation.
  • the insulating layer 5 covers the tabs and the part of the positive electrode sheet 1 and/or the negative electrode sheet 2 connected to the tabs, so that the process of insulating the tabs only needs to be performed once, which simplifies the process, and the insulating layer is integrally covered to form Insulation, to ensure the insulation effect and improve the safety of the use of cells.
  • the insulating layer 5 is a single sheet of insulating material, for example, the insulating layer 5 is a single sheet of insulating tape.
  • the electrode tab and the positive electrode sheet 1 or the negative electrode sheet 2 where the electrode tab is located are covered by a single insulating layer 5, which simplifies the process of providing insulation.
  • the insulating layer 5 of the present disclosure can avoid this problem and improve the insulating effect.
  • the separator 3 forms insulation between the positive electrode sheet 1 and the negative electrode sheet 2, and can allow passage of ions for charging and discharging. For example, the separator 3 allows lithium ions to pass therethrough.
  • the two separators 3 can form insulation between the positive electrode sheet 1 and the negative electrode sheet 2 .
  • the positive electrode sheet 1 , the negative electrode sheet 2 and the separator 3 are laminated together.
  • One of the separators 3 is located between the positive electrode sheet 1 and the negative electrode sheet 2 to form isolation on the inner side.
  • the other separator 3 is outside the positive electrode sheet 1 or the negative electrode sheet 2 .
  • the outer sides of the positive electrode sheet 1 and the negative electrode sheet 2 when they are stacked and not wound are wound together, and the separator 3 located on the outer side is between the outer sides when the positive electrode sheet 1 and the negative electrode sheet 2 are stacked and not wound form isolation.
  • the positive electrode sheet 1 and/or the negative electrode sheet 2 has a first connecting portion, and the tab and the first connecting portion are one by one.
  • the tab has a second connecting portion, the second connecting portion is electrically connected to the first connecting portion, and the tab is bent and leans toward the end of the winding structure 6 .
  • the insulating layer 5 is in one-to-one correspondence with the tabs, and the insulating layer 5 covers the side of the tab that is close to the end of the winding structure 6, and extends to cover the first electrode. a connecting part and the second connecting part.
  • the side of the tab facing away from the end of the winding structure 6 has an exposed area, and the insulating layer 5 avoids the exposed area.
  • the insulating layer 5 forms insulation between the end portion of the winding structure 6 and the tab, and extends to cover the first connection portion and the second connection portion, so as to be disposed on the positive electrode sheet 1 or the negative electrode sheet 2
  • the location of the tabs creates an insulating effect.
  • the insulating layer 5 covers from one side of the tab, and covers the position where the tab is connected to the positive electrode sheet 1 or the negative electrode sheet 2 . That is, it extends from one side of the tab close to the end of the winding structure 6 to the other side.
  • the single insulating layer 5 in this embodiment is more convenient and simple.
  • the single insulating layer 5 can cover the end of the tab and the positive electrode sheet 1 or the negative electrode sheet 2 connected to the tab. The insulation effect is improved.
  • the insulating layer 5 only needs to be provided once, which reduces the process of providing the insulating layer 5 and improves the efficiency.
  • the first tab 41 is provided on the positive electrode sheet 1 as an example for illustration.
  • the first connection part 10 on the positive electrode sheet 1 is connected with the second connection part 40 on the first tab 41 , for example, an electrical connection is formed by a welding machine.
  • the insulating layer 5 starts to coat from one side of the first tab 41 , and extends through the second connecting portion 40 , then passes through the position where the first connecting portion 10 and the second connecting portion 40 are connected, and bypasses the first tab 41 .
  • the end portion finally covers the first connecting portion 10 .
  • the side where the insulating layer 5 begins to cover is the side that is bent toward the end of the winding structure 6 .
  • the tab is on the side facing the outside of the winding structure 6 with respect to the connected positive electrode sheet 1 or the negative electrode sheet 2 .
  • the tabs may also be located on the inner side with respect to the connected positive electrode sheet 1 or negative electrode sheet 2 .
  • the exposed area on the tab faces away from the end of the winding structure 6, and the exposed area is used to form an electrical connection with the housing of the energy storage device where the cell is located, so as to form electrodes corresponding to the tabs at the corresponding positions of the housing .
  • the area of the exposed area is reserved according to actual needs. For example, in the structure where the tabs and the shell are welded, it is necessary to reserve an area that meets the welding requirements, so as to ensure that the exposed area is welded to the shell without the problem of virtual welding. It can also avoid the problem of short circuit caused by the exposed area contacting the opposite electrode due to the excessive area of the exposed area.
  • the tabs are located at the ends of the positive electrode sheet 1 and/or the negative electrode sheet 2 , and the insulating layer 5 covers the positive electrode sheet 1 and/or the negative electrode sheet 2 where the tabs are located. the end of the negative electrode sheet 2 .
  • the insulating layer 5 covers the electrode tab and the partial structure of the positive electrode sheet 1 or the negative electrode sheet 2 connected to the electrode tab, and also covers the positive electrode sheet 1 or the negative electrode sheet 2 where the tab is located. The end portion further improves the insulating effect of the connection position between the tab and the corresponding positive electrode sheet 1 or negative electrode sheet 2 .
  • the tabs are arranged at the end of the corresponding positive electrode sheet 1 or the negative electrode sheet 2 , and it is easier to locate the position of the tabs after the structure of the winding structure 6 is formed.
  • the tabs are located at the ends of the corresponding positive electrode sheet 1 or the negative electrode sheet 2 , which avoids stacking to increase the thickness, and can reduce the increased volume supported by the tabs on the winding structure 6 . In this way, the winding structure 6 is more compact, and the stability of the winding structure 6 is improved.
  • a through hole 60 is formed in the middle of the winding structure 6 , and at the beginning of the winding structure 6 , at least one of the isolation films 3 extends through the through hole 60 . inside hole 60.
  • a through hole 60 is formed in the middle, and a part of the hole wall of the through hole 60 is formed at the starting end of the winding.
  • At least one isolation film 3 extends into the through hole 60 by leaving a part of the isolation film 3 at the starting end of the winding structure 6 .
  • the separator 3 located in the through hole 60 is not pressed by the positive electrode sheet 1 and the negative electrode sheet 2 .
  • the separator 3 extending into the through hole 60 helps to absorb the electrolyte.
  • the part of the separator 3 extending into the through hole 60 makes the beginning of the winding structure 6 wrap the positive electrode sheet 1 and the negative electrode sheet 2 more completely, which can prevent the positive electrode sheet 1 and the negative electrode sheet 2 from being exposed.
  • Such a structure improves the insulating effect of the isolation film 3 at the beginning of the winding structure 6, so as to improve the safety of the energy storage device.
  • the end of the isolation film 3 is in contact with the hole wall of the through hole 60 .
  • the portion of the isolation film 3 extending into the through hole 60 is in contact with the hole wall of the through hole 60 , which can further form an insulating effect. For example, it is possible to avoid the short circuit problem that occurs when the start ends of the positive electrode sheet 1 and the negative electrode sheet 2 protrude into the through holes 60 .
  • the end of the isolation film 3 is in contact with the hole wall of the through hole 60 , which effectively isolates the through hole 60 and forms two spaces separated by the isolation film 3 .
  • the isolation film 3 forms insulation between the two separated spaces, which further improves the insulation effect of the winding structure 6 and increases the safety of the energy storage device.
  • the cross section of the part of the isolation film 3 located in the through hole 60 is linear or S-shaped.
  • the partial structure of the isolation film 3 in the through hole 60 may be linearly extended, or the partial structure of the extended isolation film 3 may be S-shaped. It can be adjusted according to the actual structure and requirements in the through hole 60 .
  • the portions of the isolation film 3 extending into the through holes 60 have different shapes, and the different shapes provide different surface areas. Different shapes of the separator 3 have different contact areas with the electrolyte and have different absorption effects.
  • the portion of the isolation film 3 located in the through hole 60 extends along the radial direction of the through hole 60 .
  • the isolation film 3 extends radially inside the through hole 60 and can isolate the through hole 60 into two uniform parts. In this way, the spaces on both sides of the separator 3 can have the same accommodation capacity, which satisfies the available space for the positive electrode sheet 1 or the negative electrode sheet 2 to protrude into the through hole 60 .
  • the through holes 60 help the electrolyte in the energy storage device to enter, increase the contact area between the electrolyte and the positive electrode sheet 1 and the negative electrode sheet 2, and improve the charging and discharging capability.
  • the portion of the isolation diaphragm 3 extending into the through hole 60 has a size in the radial direction of the through hole 60 larger than the radial size of the through hole 60 .
  • the size of the portion of the isolation film 3 extending into the through hole 60 is larger with respect to the radial dimension of the through hole 60 .
  • the isolation film 3 can form an effective isolation in the through hole 60 to increase the insulating effect.
  • the separator 3 extends from the beginning of the winding structure 6 into the through hole 60 , and the ends of the positive electrode sheet 1 and the negative electrode sheet 2 on both sides of the separator 3 are located at the two ends of the structure of the separator 3 extending into the through hole 60 . side.
  • the size of the separator 3 is larger, and when the separator 3 is set in different shapes or different states, two spaces that are insulated from each other can be effectively formed at the beginning to form an effective isolation between the beginnings of the positive electrode sheet 1 and the negative electrode sheet 2 .
  • the existence of a gap between the two sides of the isolation film 3 isolated in the through hole 60 is avoided, and the insulating effect is increased.
  • the tab includes a first tab 41 and a second tab 42 , the first tab 41 is electrically connected to the positive electrode sheet 1 , and the second tab is The ears 42 are electrically connected to the negative electrode sheet 2 .
  • the insulating layer 5 includes a first insulating layer and a second insulating layer, and the first insulating layer covers the first tab 41 and the part of the positive electrode sheet 1 connected to the first tab 41 , The second insulating layer covers the second tab 42 and the part of the negative electrode sheet 2 connected to the second tab 42 .
  • the first tabs 41 are bent and approach one end of the winding structure 6
  • the second tabs 42 are bent and approach the other end of the winding structure 6
  • the first tabs 41 The included angle with the projection of the second tab 42 on the cross section of the winding structure 6 is 0°-90°.
  • the first tab 41 is disposed at the end of the positive electrode sheet 1
  • the second tab 42 is disposed at the end of the negative electrode sheet 2 .
  • the negative electrode sheet 2 is located at an outer layer relative to the positive electrode sheet 1, and the negative electrode sheet 2 needs to be wound for more distance relative to the positive electrode sheet 1 at the end, so that the charging and discharging function of the formed cell is better. .
  • the included angle between the projections of the first tab 41 and the second tab 42 on the cross section of the winding structure 6 is 0°-90°, that is, the end of the negative electrode sheet 2 is wound relative to the end of the positive electrode sheet 1
  • the outer layer of the structure 6 is wound by 0°-90°. In this way, the number of negative electrode sheets 2 in the outermost layer is more than that of positive electrode sheets 1 , and at the same time, there is no need to wrap more negative electrode sheets 2 in the circumferential direction, which saves materials and reduces costs.
  • the two isolation films 3 are folded from a single isolation film.
  • two separators 3 are formed by folding one separator 3 in half, and the positive electrode sheet 1 or the negative electrode sheet 2 located between the two separators 3 is sandwiched by the folded separators 3 .
  • One isolation film 3 is folded in half to form a structure of two isolation films 3 , which can increase the structural strength of the winding structure 6 .
  • the strength of the insulating structure formed by the separator 3 for the positive electrode sheet 1 and the negative electrode sheet 2 is improved, and the overall structural strength of the winding structure 6 is improved at the same time.
  • a single isolation film 3 is folded in half at the position of the beginning or the end when the winding structure 6 is wound, which can effectively form an insulating effect at the end.
  • the separator 3 may be folded in half at the position of one side of the positive electrode sheet 1 or the negative electrode sheet 2 .
  • the positive electrode sheet 1 and the negative electrode sheet 2 have two sides of the beginning and the end, and two sides connecting the beginning and the end.
  • the single sheet of separator 3 is folded in half along the long side parallel to itself or perpendicular to the long side.
  • the long side is the side in the longitudinal direction of the separator 3 .
  • the winding structure 6 is wound with double needles, and the winding needles are withdrawn after the winding structure 6 is formed.
  • the isolation film 3 extending in the through hole 60 is sandwiched between the two winding needles, so that part of the structure of the isolation film 3 can be effectively maintained at the protruding end during winding, so as to form the winding structure 6 and then remain in the through hole 60.
  • the size of the negative electrode sheet 2 at each end of the winding structure 6 is larger than the size of the positive electrode sheet 1 by more than 0.1 mm.
  • the size of the negative electrode sheet 2 at the end of the winding structure 6 is larger than that of the positive electrode sheet 1 , so that the negative electrode sheet 2 has more volume and meets the demand for the consumption of the negative electrode sheet 2 by charging and discharging.
  • the negative electrode sheet 2 is higher than the positive electrode sheet by 0.1 mm or more, so as to meet the consumption demand of the negative electrode sheet 2 by the charging and discharging of the energy storage device.
  • the size of the separator 3 at each end of the winding structure 6 is larger than the size of the negative electrode sheet 2 by more than 0.5 mm.
  • the separator 3 is higher than the negative electrode sheet by more than 0.5 mm, so that the separator 3 can effectively separate the positive electrode sheet 1 and the negative electrode sheet 2 at the end of the winding structure 6 . form insulation.
  • an energy storage device is provided. As shown in FIG. 7 , the energy storage device includes the battery cell and the case 7 as described in any one of the foregoing embodiments.
  • the winding structure 6 is arranged in the casing 7, and the casing 7 is welded with the tabs.
  • the welding position has two welding points 8, and the distance between the two welding points 8 is 0.5 mm-5mm.
  • the tabs and the housing 7 are fixed and electrically connected by welding.
  • it is fixed and electrically connected by means of two-pin soldering.
  • the distance between the two welding points 8 is 0.5mm-5mm, which can not only meet the welding requirements, but also prevent the welding position from being separated from the tabs, so as to avoid virtual welding.
  • the distance between the two welding points 8 is 0.5mm-5mm .
  • the casing 7 includes an inner casing 71 and an outer casing 72 .
  • Both the inner casing 71 and the outer casing 72 are cylindrical structures with one end open, and the outer casing 72 is sleeved with a outside the inner shell 71 to seal the cylindrical structure.
  • a sealing ring 9 is disposed between the inner casing 71 and the outer casing 72 , and the width of the sealing ring 9 exposing the opening of the outer casing 72 is greater than 0.5 mm.
  • the sealing ring 9 forms a seal and insulation between the inner casing 71 and the outer casing 72 .
  • the width of the opening of the sealing ring 9 exposing the outer casing 72 is made larger than 0.5 mm, which can effectively prevent the outer casing 72 from contacting the inner casing 71 and improve the insulation effect.
  • the inner shell 71 includes a top plate and a first side wall, and the first side wall is disposed around the top plate to form a cylindrical structure.
  • the housing 72 includes a bottom plate and a second side wall disposed around the bottom plate to form a cylindrical structure.
  • the second side wall is sleeved outside the first side wall, the sealing ring 9 is arranged between the second side wall and the first side wall, and the first side wall is connected to the first side wall.
  • the overlapping area between the two side walls accounts for 10%-90%.
  • the first side wall and the second side wall are the side walls of the cylindrical structure.
  • the overlapping portion of the first side wall and the second side wall determines the area of the area where the inner shell 71 and the outer shell 72 are connected.
  • the first tab 41 connected to the positive electrode sheet 1 is electrically connected to one of the top plate on the inner casing 71 or the bottom plate on the outer casing 72 .
  • the second tab 42 on the negative electrode sheet 2 is electrically connected to the other of the top plate on the inner casing 71 or the bottom plate on the outer casing 72 .
  • an electronic device including the energy storage device according to any one of the above embodiments.
  • the energy storage device in the above embodiment is used for electronic equipment, which improves the safety of electronic equipment.
  • the electronic equipment may be a mobile phone, a tablet computer, an earphone, or other equipment that requires an energy storage device to provide energy.

Abstract

The present invention relates to a cell, an energy storage device and an electronic apparatus. The cell comprises a positive electrode sheet, a negative electrode sheet and two isolation films, wherein one of the positive electrode sheet and the negative electrode sheet is located between the two isolation films, and the other is located on an outer side of one of the isolation films; the positive electrode sheet, the negative electrode sheet and the two isolation films form a spiral wound structure; the positive electrode sheet and/or the negative electrode sheet are/is provided with a tab; and the cell further comprises an insulating layer that covers the tab, and a part of the positive electrode sheet and/or the negative electrode sheet connected to the tab. (FIG. 2)

Description

电芯、储能装置及电子设备Cells, energy storage devices and electronic equipment
本公开要求于2021年04月28日提交中国专利局，申请号为202120908441.7，申请名称为“电芯、储能装置及电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。This disclosure claims the priority of a Chinese patent application with the application number 202120908441.7 and the application title "Cell, Energy Storage Device and Electronic Equipment", which was filed with the China Patent Office on April 28, 2021, the entire contents of which are incorporated herein by reference Public.
技术领域technical field
本发明涉及储能技术领域，更具体地，本发明涉及一种电芯、储能装置及电子设备。The present invention relates to the technical field of energy storage, and more particularly, to a battery cell, an energy storage device and an electronic device.
背景技术Background technique
储能装置用于为设备提供能源，储能装置的安全性影响着设备的安全使用。储能装置中的电芯在充放电过程中起到了重要的作用，电芯的安全性能影响着储能装置的安全性。The energy storage device is used to provide energy for the equipment, and the safety of the energy storage device affects the safe use of the equipment. The cells in the energy storage device play an important role in the charging and discharging process, and the safety performance of the cells affects the safety of the energy storage device.
电芯上的极耳需要做好绝缘设置，以避免极耳导致电芯短路。一般在极耳的不同位置设置绝缘胶纸实现绝缘效果，多个位置设置绝缘胶纸导致工序复杂，不同位置之间的间隙容易导致绝缘失效的问题。The tabs on the cells need to be insulated to prevent the tabs from short-circuiting the cells. Generally, insulating tapes are arranged at different positions of the tabs to achieve the insulating effect. The insulating tapes are arranged in multiple positions, which leads to complicated processes, and the gap between different positions easily leads to the problem of insulation failure.
因此，需要提供一种新的技术方案，以解决上述问题。Therefore, it is necessary to provide a new technical solution to solve the above problems.
发明内容SUMMARY OF THE INVENTION
本发明的一个目的是提供一种电芯、储能装置及电子设备。An object of the present invention is to provide a battery cell, an energy storage device and an electronic device.
根据本发明的第一方面，提供一种电芯，该电芯包括正极片、负极片和两个隔离膜；According to a first aspect of the present invention, a battery cell is provided, the battery core includes a positive electrode sheet, a negative electrode sheet and two separators;
所述正极片和所述负极片中的一个位于两个所述隔离膜之间，另一个位于其中一个隔离膜外侧，所述正极片、所述负极片和所述两个隔离膜形成螺旋状的卷绕结构；One of the positive electrode sheet and the negative electrode sheet is located between the two separators, and the other is positioned outside one of the separators, and the positive electrode sheet, the negative electrode sheet, and the two separators form a spiral shape the winding structure;
所述正极片和/或所述负极片设置有极耳；The positive electrode sheet and/or the negative electrode sheet are provided with tabs;
还包括绝缘层，所述绝缘层包覆所述极耳以及与所述极耳连接的所述 正极片和/或所述负极片的部分。An insulating layer is also included, and the insulating layer covers the tabs and the part of the positive electrode sheet and/or the negative electrode sheet connected with the tabs.
可选地，所述正极片和/或所述负极片具有第一连接部，所述极耳与所述第一连接部一一对应，所述极耳具有第二连接部，所述第二连接部与所述第一连接部电连接，所述极耳弯折并靠向所述卷绕结构的端部；Optionally, the positive electrode sheet and/or the negative electrode sheet has a first connection portion, the tabs are in one-to-one correspondence with the first connection portions, the tabs have a second connection portion, and the second connection portion is The connecting portion is electrically connected to the first connecting portion, and the tab is bent and leans toward the end of the winding structure;
所述绝缘层与所述极耳一一对应，所述绝缘层包覆所述极耳的靠向所述卷绕结构的端部的一侧，并延伸至包覆所述第一连接部和所述第二连接部；The insulating layer is in one-to-one correspondence with the tabs, and the insulating layer covers the side of the tab that is close to the end of the winding structure, and extends to cover the first connecting portion and the the second connecting portion;
所述极耳的背向所述卷绕结构的端部的一侧具有外露区域，所述绝缘层避让所述外露区域。The side of the tab facing away from the end of the winding structure has an exposed area, and the insulating layer avoids the exposed area.
可选地，所述极耳位于所述正极片和/或所述负极片的端部，所述绝缘层包覆所述极耳所在的所述正极片和/或所述负极片的端部。Optionally, the tab is located at the end of the positive electrode sheet and/or the negative electrode sheet, and the insulating layer covers the end of the positive electrode sheet and/or the negative electrode sheet where the tab is located .
可选地，所述卷绕结构的中部形成通孔，在所述卷绕结构的起始端，至少一个所述隔离膜延伸于所述通孔内。Optionally, a through hole is formed in the middle of the winding structure, and at the starting end of the winding structure, at least one of the isolation films extends into the through hole.
可选地，所述隔离膜的位于所述通孔内的部分的横截面呈直线形或者S形。Optionally, the cross-section of the portion of the isolation film located in the through hole is linear or S-shaped.
可选地，所述隔离膜的位于所述通孔内的部分沿通孔的径向延伸。Optionally, the portion of the isolation membrane located in the through hole extends along the radial direction of the through hole.
可选地，所述极耳包括第一极耳和第二极耳，所述第一极耳与所述正极片电连接，所述第二极耳与所述负极片电连接；Optionally, the tab includes a first tab and a second tab, the first tab is electrically connected to the positive electrode sheet, and the second tab is electrically connected to the negative electrode sheet;
所述绝缘层包括第一绝缘层和第二绝缘层，所述第一绝缘层包覆所述第一极耳以及与所述第一极耳连接的所述正极片的部分，所述第二绝缘层包覆所述第二极耳以及与所述第二极耳连接的所述负极片的部分；The insulating layer includes a first insulating layer and a second insulating layer, the first insulating layer covers the first tab and the part of the positive electrode plate connected to the first tab, the second an insulating layer covers the second tab and the part of the negative electrode sheet connected to the second tab;
所述第一极耳弯折并靠向所述卷绕结构的一端，所述第二极耳弯折并靠向所述卷绕结构的另一端，所述第一极耳与所述第二极耳在所述卷绕结构的横截面上的投影之间的夹角为0°-90°。The first tab is bent and approached to one end of the winding structure, the second tab is bent and approached to the other end of the winding structure, the first tab and the second tab are The included angle between the projections of the tabs on the cross section of the winding structure is 0°-90°.
可选地，两个所述隔离膜为单张隔离膜折叠而成。Optionally, the two isolation films are folded from a single isolation film.
可选地，在所述卷绕结构的轴向上，所述卷绕结构的每一端的所述负极片的尺寸大于所述正极片的尺寸0.1mm以上。Optionally, in the axial direction of the winding structure, the size of the negative electrode sheet at each end of the winding structure is larger than the size of the positive electrode sheet by more than 0.1 mm.
可选地，在所述卷绕结构的轴向上，所述卷绕结构的每一端的所述隔离膜的尺寸大于所述负极片的尺寸0.5mm以上。Optionally, in the axial direction of the winding structure, the size of the separator at each end of the winding structure is larger than the size of the negative electrode sheet by more than 0.5 mm.
根据本发明的第二方面，提供一种储能装置，该储能装置包括如第一方面所述的电芯和壳体；According to a second aspect of the present invention, an energy storage device is provided, and the energy storage device includes the battery cell and the housing as described in the first aspect;
所述卷绕结构设置在所述壳体内，所述壳体与所述极耳焊接，焊接的位置具有两个焊点，两个所述焊点之间的距离为0.5mm-5mm。The winding structure is arranged in the casing, the casing is welded with the tab, and the welding position has two welding points, and the distance between the two welding points is 0.5mm-5mm.
可选地，所述壳体包括内壳和外壳，所述内壳和所述外壳均为一端开口的筒状结构，所述外壳套设所述内壳外，以密封所述筒状结构；Optionally, the casing includes an inner casing and an outer casing, the inner casing and the outer casing are both cylindrical structures with one end open, and the outer casing is sleeved over the inner casing to seal the cylindrical structure;
所述内壳与所述外壳之间设置有密封圈，所述密封圈的露出所述外壳的开口的宽度大于0.5mm。A sealing ring is arranged between the inner casing and the outer casing, and the width of the opening of the sealing ring exposing the outer casing is greater than 0.5 mm.
可选地，所述内壳包括顶板和第一侧壁，所述第一侧壁围绕所述顶板设置，以形成筒状结构；Optionally, the inner shell includes a top plate and a first side wall, and the first side wall is disposed around the top plate to form a cylindrical structure;
所述外壳包括底板和第二侧壁，所述第二侧壁围绕所述底板设置，以形成筒状结构；the housing includes a bottom plate and a second side wall, the second side wall is disposed around the bottom plate to form a cylindrical structure;
所述第二侧壁套设在所述第一侧壁外，所述密封圈设置在所述第二侧壁与所述第一侧壁之间，所述第一侧壁与所述第二侧壁之间重叠的区域占比为10％-90％。The second side wall is sleeved outside the first side wall, the sealing ring is arranged between the second side wall and the first side wall, and the first side wall and the second side wall are The area of overlap between the side walls is 10%-90%.
根据本发明的第三方面，提供一种电子设备，该电子设备包括如第二方面所述的储能装置。According to a third aspect of the present invention, there is provided an electronic device comprising the energy storage device of the second aspect.
本发明的一个技术效果在于，通过绝缘层包覆极耳以及与极耳连接的正极片和/或负极片的部分，使对极耳设置绝缘的工序只需要进行一次，简化了工序，并且绝缘层整体包覆形成绝缘，保障了绝缘效果，提高了电芯使用的安全性。One technical effect of the present invention is that, by covering the tabs and the parts of the positive and/or negative tabs connected to the tabs with an insulating layer, the process of insulating the tabs only needs to be performed once, which simplifies the process and provides insulation. The overall coating of the layer forms insulation, which ensures the insulation effect and improves the safety of the use of the cell.
通过以下参照附图对本发明的示例性实施例的详细描述，本发明的其它特征及其优点将会变得清楚。Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.
附图说明Description of drawings
构成说明书的一部分的附图描述了本发明的实施例，并且连同说明书一起用于解释本发明的原理。The accompanying drawings, which form a part of the specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.
图1是本公开一个实施例中的电芯的剖面图。FIG. 1 is a cross-sectional view of a cell in one embodiment of the present disclosure.
图2是本公开一个实施例中的正极片上设置第一极耳的一侧面的结构 示意图。Fig. 2 is a schematic structural diagram of a side surface on which the first tab is disposed on the positive electrode sheet according to an embodiment of the present disclosure.
图3是图2的另一侧面的结构示意图。FIG. 3 is a schematic structural diagram of another side of FIG. 2 .
图4是本公开一个实施例中的电芯的结构示意图。FIG. 4 is a schematic structural diagram of a battery cell in an embodiment of the present disclosure.
图5是本公开一个实施例中的电芯的端面的示意图。5 is a schematic diagram of an end face of a cell in an embodiment of the present disclosure.
图6是本公开另一个实施例中的电芯的结构示意图。FIG. 6 is a schematic structural diagram of a battery cell in another embodiment of the present disclosure.
图7是本公开一个实施例中壳体与极耳焊接的焊点的结构示意图。FIG. 7 is a schematic structural diagram of a welding point for welding a shell and a tab in an embodiment of the present disclosure.
图8是本公开一个实施例中的储能装置的剖面图。8 is a cross-sectional view of an energy storage device in one embodiment of the present disclosure.
附图标记说明：1、正极片；10、第一连接部；2、负极片；3、隔离膜；40、第二连接部；41、第一极耳；42、第二极耳；5、绝缘层；6、卷绕结构；60、通孔；7、壳体；71、内壳；72、外壳；8、焊点；9、密封圈。Description of reference numerals: 1. Positive electrode sheet; 10. First connecting part; 2. Negative electrode sheet; 3. Separator; 40. Second connecting part; 41. First tab; 42, Second tab; Insulation layer; 6, winding structure; 60, through hole; 7, shell; 71, inner shell; 72, outer shell; 8, solder joint; 9, sealing ring.
具体实施方式Detailed ways
现在将参照附图来详细描述本发明的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本发明的范围。Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the invention unless specifically stated otherwise.
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本发明及其应用或使用的任何限制。The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
对于相关领域普通技术人员已知的技术和设备可能不作详细讨论，但在适当情况下，所述技术和设备应当被视为说明书的一部分。Techniques and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques and devices should be considered part of the specification.
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.
根据本公开的一个实施例，提供了一种电芯，如图1所示，该电芯包括正极片1、负极片2和两个隔离膜3。According to an embodiment of the present disclosure, a battery cell is provided. As shown in FIG. 1 , the battery cell includes a positive electrode sheet 1 , a negative electrode sheet 2 and two separators 3 .
所述正极片1和所述负极片2中的一个位于两个所述隔离膜3之间，另一个位于其中一个隔离膜3外侧，所述正极片1、所述负极片2和所述 两个隔离膜3形成螺旋状的卷绕结构6。One of the positive electrode sheet 1 and the negative electrode sheet 2 is located between the two separators 3, and the other is located outside one of the separators 3. The positive electrode sheet 1, the negative electrode sheet 2 and the two separators The isolation films 3 form a helical winding structure 6 .
所述正极片1和/或所述负极片2设置有极耳。The positive electrode sheet 1 and/or the negative electrode sheet 2 are provided with tabs.
还包括绝缘层5，所述绝缘层5包覆所述极耳以及与所述极耳连接的所述正极片1和/或所述负极片2的部分。An insulating layer 5 is also included, and the insulating layer 5 covers the tabs and the part of the positive electrode sheet 1 and/or the negative electrode sheet 2 connected to the tabs.
在该实施例中，可以是正极片1上设置极耳，也可以是负极片2上设置极耳，还可以是正极片1和负极片2上均设置极耳。In this embodiment, tabs may be provided on the positive electrode sheet 1 , or tabs may be provided on the negative electrode sheet 2 , or both the positive electrode sheet 1 and the negative electrode sheet 2 may be provided with tabs.
通过绝缘层5包覆极耳以及该极耳所在的正极片1或负极片2，以在极耳的位置形成有效绝缘。在形成卷绕结构6后，极耳与所在的正极片1或负极片2连接的部分以外的结构能够形成有效的绝缘。The tab and the positive electrode sheet 1 or the negative electrode sheet 2 where the tab is located are covered by an insulating layer 5 to form effective insulation at the position of the tab. After the winding structure 6 is formed, structures other than the portion where the tab is connected to the positive electrode sheet 1 or the negative electrode sheet 2 can form effective insulation.
通过绝缘层5包覆极耳以及与极耳连接的正极片1和/或负极片2的部分，使对极耳设置绝缘的工序只需要进行一次，简化了工序，并且绝缘层整体包覆形成绝缘，保障了绝缘效果，提高了电芯使用的安全性。The insulating layer 5 covers the tabs and the part of the positive electrode sheet 1 and/or the negative electrode sheet 2 connected to the tabs, so that the process of insulating the tabs only needs to be performed once, which simplifies the process, and the insulating layer is integrally covered to form Insulation, to ensure the insulation effect and improve the safety of the use of cells.
相比于现有技术中在极耳的不同侧分别设置绝缘胶纸的方案，本公开通过绝缘层5包覆，能够一次对极耳做好绝缘处理。绝缘层5是单张绝缘材料，例如，绝缘层5为单张的绝缘胶纸。通过单张的绝缘层5包覆极耳以及与极耳所在的正极片1或负极片2，简化了设置绝缘的工序。Compared with the prior art solution of disposing insulating tapes on different sides of the tabs, the present disclosure is covered by the insulating layer 5, so that the tabs can be insulated at one time. The insulating layer 5 is a single sheet of insulating material, for example, the insulating layer 5 is a single sheet of insulating tape. The electrode tab and the positive electrode sheet 1 or the negative electrode sheet 2 where the electrode tab is located are covered by a single insulating layer 5, which simplifies the process of providing insulation.
现有技术中的不同侧的绝缘胶纸之间存在间隙，间隙位置也是破坏绝缘效果的因素。本公开的绝缘层5能够避免该问题，提高了绝缘效果。In the prior art, there are gaps between insulating tapes on different sides, and the position of the gap is also a factor that destroys the insulating effect. The insulating layer 5 of the present disclosure can avoid this problem and improve the insulating effect.
隔离膜3在正极片1与负极片2之间形成绝缘，并且能够允许电离子通过，以用于充放电。例如，隔离膜3允许锂离子通过。两个隔离膜3能够在正极片1与负极片2之间形成绝缘。在未卷绕前的结构中，正极片1、负极片2和隔离膜3层叠在一起。其中的一个隔离膜3位于正极片1与负极片2之间，在内侧形成隔离。另一个隔离膜3在正极片1或负极片2的外侧。在形成卷绕结构后，使正极片1和负极片2层叠未卷绕时的外侧卷绕在一起，位于外侧的隔离膜3在正极片1和负极片2层叠未卷绕时的外侧之间形成隔离。The separator 3 forms insulation between the positive electrode sheet 1 and the negative electrode sheet 2, and can allow passage of ions for charging and discharging. For example, the separator 3 allows lithium ions to pass therethrough. The two separators 3 can form insulation between the positive electrode sheet 1 and the negative electrode sheet 2 . In the structure before winding, the positive electrode sheet 1 , the negative electrode sheet 2 and the separator 3 are laminated together. One of the separators 3 is located between the positive electrode sheet 1 and the negative electrode sheet 2 to form isolation on the inner side. The other separator 3 is outside the positive electrode sheet 1 or the negative electrode sheet 2 . After the winding structure is formed, the outer sides of the positive electrode sheet 1 and the negative electrode sheet 2 when they are stacked and not wound are wound together, and the separator 3 located on the outer side is between the outer sides when the positive electrode sheet 1 and the negative electrode sheet 2 are stacked and not wound form isolation.
在一个实施例中，如图2，图3，图4所示，所述正极片1和/或所述负极片2具有第一连接部，所述极耳与所述第一连接部一一对应，所述极耳具有第二连接部，所述第二连接部与所述第一连接部电连接，所述极耳 弯折并靠向所述卷绕结构6的端部。In one embodiment, as shown in FIG. 2 , FIG. 3 , and FIG. 4 , the positive electrode sheet 1 and/or the negative electrode sheet 2 has a first connecting portion, and the tab and the first connecting portion are one by one. Correspondingly, the tab has a second connecting portion, the second connecting portion is electrically connected to the first connecting portion, and the tab is bent and leans toward the end of the winding structure 6 .
所述绝缘层5与所述极耳一一对应，所述绝缘层5包覆所述极耳的靠向所述卷绕结构6的端部的一侧，并延伸至包覆所述第一连接部和所述第二连接部。The insulating layer 5 is in one-to-one correspondence with the tabs, and the insulating layer 5 covers the side of the tab that is close to the end of the winding structure 6, and extends to cover the first electrode. a connecting part and the second connecting part.
所述极耳的背向所述卷绕结构6的端部的一侧具有外露区域，所述绝缘层5避让所述外露区域。The side of the tab facing away from the end of the winding structure 6 has an exposed area, and the insulating layer 5 avoids the exposed area.
在该实施例中，绝缘层5在卷绕结构6的端部与极耳之间形成绝缘，并延伸至包覆第一连接部和第二连接部，从而在正极片1或负极片2设置极耳的位置形成绝缘效果。In this embodiment, the insulating layer 5 forms insulation between the end portion of the winding structure 6 and the tab, and extends to cover the first connection portion and the second connection portion, so as to be disposed on the positive electrode sheet 1 or the negative electrode sheet 2 The location of the tabs creates an insulating effect.
该绝缘层5从极耳的一侧包覆，并包覆极耳与正极片1或负极片2连接的位置。即从极耳靠向卷绕结构6端部的一侧延伸至另一侧。相比于现有技术的极耳的两侧分别设置绝缘，该实施例单张绝缘层5更加方便简单。并且，单张绝缘层5能够在极耳的端部包覆极耳以及与极耳连接的正极片1或负极片2。提高了绝缘效果。只需要设置一次绝缘层5，减少了设置绝缘层5的工序，提高了效率。The insulating layer 5 covers from one side of the tab, and covers the position where the tab is connected to the positive electrode sheet 1 or the negative electrode sheet 2 . That is, it extends from one side of the tab close to the end of the winding structure 6 to the other side. Compared with the prior art in which insulation is provided on both sides of the tab, the single insulating layer 5 in this embodiment is more convenient and simple. In addition, the single insulating layer 5 can cover the end of the tab and the positive electrode sheet 1 or the negative electrode sheet 2 connected to the tab. The insulation effect is improved. The insulating layer 5 only needs to be provided once, which reduces the process of providing the insulating layer 5 and improves the efficiency.
以正极片1上设置第一极耳41为例说明。正极片1上的第一连接部10和第一极耳41上的第二连接部40连接，例如通过焊机形成电连接。The first tab 41 is provided on the positive electrode sheet 1 as an example for illustration. The first connection part 10 on the positive electrode sheet 1 is connected with the second connection part 40 on the first tab 41 , for example, an electrical connection is formed by a welding machine.
绝缘层5从第一极耳41的一侧开始包覆，并延伸经过第二连接部40，再经过第一连接部10和第二连接部40连接的位置且绕过第一极耳41的端部，最后包覆第一连接部10。绝缘层5开始包覆的一侧是弯折后靠向卷绕结构6的端部的一侧。The insulating layer 5 starts to coat from one side of the first tab 41 , and extends through the second connecting portion 40 , then passes through the position where the first connecting portion 10 and the second connecting portion 40 are connected, and bypasses the first tab 41 . The end portion finally covers the first connecting portion 10 . The side where the insulating layer 5 begins to cover is the side that is bent toward the end of the winding structure 6 .
该例子中，极耳相对于连接的正极片1或负极片2是朝向卷绕结构6的外侧的一侧。也可以是极耳相对于连接的正极片1或负极片2位于内侧。In this example, the tab is on the side facing the outside of the winding structure 6 with respect to the connected positive electrode sheet 1 or the negative electrode sheet 2 . The tabs may also be located on the inner side with respect to the connected positive electrode sheet 1 or negative electrode sheet 2 .
极耳上的外露区域背向卷绕结构6的端部，外露区域用于和电芯所在的储能装置的壳体形成电连接，以在壳体的对应位置上形成与极耳对应的电极。The exposed area on the tab faces away from the end of the winding structure 6, and the exposed area is used to form an electrical connection with the housing of the energy storage device where the cell is located, so as to form electrodes corresponding to the tabs at the corresponding positions of the housing .
外露区域的面积根据实际需求预留。例如，极耳与壳体焊接的结构中，需要预留满足焊接需求的面积，保障外露区域与壳体焊接时不会产生虚焊的问题。也能够避免外露区域面积过大导致外露区域接触到相反的电极引 起的短路问题。The area of the exposed area is reserved according to actual needs. For example, in the structure where the tabs and the shell are welded, it is necessary to reserve an area that meets the welding requirements, so as to ensure that the exposed area is welded to the shell without the problem of virtual welding. It can also avoid the problem of short circuit caused by the exposed area contacting the opposite electrode due to the excessive area of the exposed area.
在一个实施例中，所述极耳位于所述正极片1和/或所述负极片2的端部，所述绝缘层5包覆所述极耳所在的所述正极片1和/或所述负极片2的端部。In one embodiment, the tabs are located at the ends of the positive electrode sheet 1 and/or the negative electrode sheet 2 , and the insulating layer 5 covers the positive electrode sheet 1 and/or the negative electrode sheet 2 where the tabs are located. the end of the negative electrode sheet 2 .
在该实施例中，绝缘层5在包覆极耳以及与极耳连接的正极片1或负极片2的部分结构的基础上，还包覆了极耳所在的正极片1或负极片2的端部，进一步提高了极耳与对应的正极片1或负极片2连接位置的绝缘效果。In this embodiment, the insulating layer 5 covers the electrode tab and the partial structure of the positive electrode sheet 1 or the negative electrode sheet 2 connected to the electrode tab, and also covers the positive electrode sheet 1 or the negative electrode sheet 2 where the tab is located. The end portion further improves the insulating effect of the connection position between the tab and the corresponding positive electrode sheet 1 or negative electrode sheet 2 .
可选地，将极耳设置在对应的正极片1或负极片2的末端，在形成卷绕结构6的结构后更容易定位极耳的位置。并且极耳位于对应的正极片1或负极片2的端部，避免层叠增加厚度，能够减小极耳对卷绕结构6支撑增加的体积。这样使卷绕结构6更加紧密，提高了卷绕结构6的稳定性。Optionally, the tabs are arranged at the end of the corresponding positive electrode sheet 1 or the negative electrode sheet 2 , and it is easier to locate the position of the tabs after the structure of the winding structure 6 is formed. In addition, the tabs are located at the ends of the corresponding positive electrode sheet 1 or the negative electrode sheet 2 , which avoids stacking to increase the thickness, and can reduce the increased volume supported by the tabs on the winding structure 6 . In this way, the winding structure 6 is more compact, and the stability of the winding structure 6 is improved.
在一个实施中，如图4，图5所示，所述卷绕结构6的中部形成通孔60，在所述卷绕结构6的起始端，至少一个所述隔离膜3延伸于所述通孔60内。In one implementation, as shown in FIG. 4 and FIG. 5 , a through hole 60 is formed in the middle of the winding structure 6 , and at the beginning of the winding structure 6 , at least one of the isolation films 3 extends through the through hole 60 . inside hole 60.
卷绕结构6形成后，中部会形成通孔60，卷绕的起始端形成该通孔60的一部分孔壁。After the winding structure 6 is formed, a through hole 60 is formed in the middle, and a part of the hole wall of the through hole 60 is formed at the starting end of the winding.
通过在卷绕结构6的起始端留出一部分隔离膜3，使至少一个隔离膜3延伸于通孔60内。位于通孔60内的隔离膜3没有被正极片1和负极片2挤压。在电芯位于电解液中时，伸入通孔60内的隔离膜3有助于吸收电解液。At least one isolation film 3 extends into the through hole 60 by leaving a part of the isolation film 3 at the starting end of the winding structure 6 . The separator 3 located in the through hole 60 is not pressed by the positive electrode sheet 1 and the negative electrode sheet 2 . When the cell is in the electrolyte, the separator 3 extending into the through hole 60 helps to absorb the electrolyte.
伸入通孔60的隔离膜3部分使卷绕结构6的始端对正极片1和负极片2的包裹更完整，能够防止正极片1和负极片2裸露。这样的结构提高了隔离膜3在卷绕结构6的始端的绝缘效果，以提高储能装置的安全性。The part of the separator 3 extending into the through hole 60 makes the beginning of the winding structure 6 wrap the positive electrode sheet 1 and the negative electrode sheet 2 more completely, which can prevent the positive electrode sheet 1 and the negative electrode sheet 2 from being exposed. Such a structure improves the insulating effect of the isolation film 3 at the beginning of the winding structure 6, so as to improve the safety of the energy storage device.
可选地，所述隔离膜3的端部与所述通孔60的孔壁相抵。Optionally, the end of the isolation film 3 is in contact with the hole wall of the through hole 60 .
隔离膜3的延伸于通孔60内的部分与通孔60的孔壁相抵，能够进一步形成绝缘效果。例如，能够避免正极片1和负极片2的始端一侧出现伸入通孔60内的情况时，产生的短路问题。隔离膜3的端部与通孔60的孔壁相抵，有效地隔离开了通孔60，形成两个被隔离膜3隔开的空间。隔离 膜3在两个被隔开的空间之间形成绝缘，进一步提高了卷绕结构6的绝缘效果，增加了储能装置的安全性。The portion of the isolation film 3 extending into the through hole 60 is in contact with the hole wall of the through hole 60 , which can further form an insulating effect. For example, it is possible to avoid the short circuit problem that occurs when the start ends of the positive electrode sheet 1 and the negative electrode sheet 2 protrude into the through holes 60 . The end of the isolation film 3 is in contact with the hole wall of the through hole 60 , which effectively isolates the through hole 60 and forms two spaces separated by the isolation film 3 . The isolation film 3 forms insulation between the two separated spaces, which further improves the insulation effect of the winding structure 6 and increases the safety of the energy storage device.
可选地，所述隔离膜3的位于所述通孔60内的部分的横截面呈直线形或者S形。Optionally, the cross section of the part of the isolation film 3 located in the through hole 60 is linear or S-shaped.
通孔60内的隔离膜3的部分结构可以是呈直线延伸，也可以是隔离膜3延伸的部分结构呈S形。可根据通孔60内的实际结构和需求调整。隔离膜3延伸入通孔60的部分具有的不同的形状，不同的形状提供不同的表面面积。不同形状的隔离膜3与电解液的接触面积不同，具有不同的吸收效果。The partial structure of the isolation film 3 in the through hole 60 may be linearly extended, or the partial structure of the extended isolation film 3 may be S-shaped. It can be adjusted according to the actual structure and requirements in the through hole 60 . The portions of the isolation film 3 extending into the through holes 60 have different shapes, and the different shapes provide different surface areas. Different shapes of the separator 3 have different contact areas with the electrolyte and have different absorption effects.
可选地，所述隔离膜3的位于所述通孔60内的部分沿通孔60的径向延伸。Optionally, the portion of the isolation film 3 located in the through hole 60 extends along the radial direction of the through hole 60 .
隔离膜3在通孔60内沿径向延伸，能够将通孔60隔离为均匀的两部分。这样可以使位于隔离膜3两侧的空间具有相同的容纳能力，满足正极片1或负极片2凸出至通孔60内的可用空间。The isolation film 3 extends radially inside the through hole 60 and can isolate the through hole 60 into two uniform parts. In this way, the spaces on both sides of the separator 3 can have the same accommodation capacity, which satisfies the available space for the positive electrode sheet 1 or the negative electrode sheet 2 to protrude into the through hole 60 .
通孔60有助于储能装置中的电解液进入，提高电解液与正极片1和负极片2之间的接触面积，提高了充放电能力。The through holes 60 help the electrolyte in the energy storage device to enter, increase the contact area between the electrolyte and the positive electrode sheet 1 and the negative electrode sheet 2, and improve the charging and discharging capability.
可选地，所述隔离膜3的延伸于所述通孔60内的部分，在所述通孔60的径向上的尺寸大于所述通孔60的径向尺寸。Optionally, the portion of the isolation diaphragm 3 extending into the through hole 60 has a size in the radial direction of the through hole 60 larger than the radial size of the through hole 60 .
在该实施例中，隔离膜3延伸到通孔60内的部分的尺寸相对于通孔60的径向尺寸更大。在隔离膜3与孔壁相抵时，隔离膜3能够在通孔60内形成有效的隔离，以增加绝缘效果。例如，隔离膜3从卷绕结构6的始端延伸到通孔60内，隔离膜3两侧的正极片1和负极片2的端部位于延伸到通孔60内的隔离膜3的结构的两侧。In this embodiment, the size of the portion of the isolation film 3 extending into the through hole 60 is larger with respect to the radial dimension of the through hole 60 . When the isolation film 3 is in contact with the hole wall, the isolation film 3 can form an effective isolation in the through hole 60 to increase the insulating effect. For example, the separator 3 extends from the beginning of the winding structure 6 into the through hole 60 , and the ends of the positive electrode sheet 1 and the negative electrode sheet 2 on both sides of the separator 3 are located at the two ends of the structure of the separator 3 extending into the through hole 60 . side.
隔离膜3的尺寸更大，在隔离膜3设置为不同形状或不同状态时，能够有效地在始端形成相互绝缘的两个空间，以在正极片1和负极片2的始端之间形成有效隔离。避免了隔离膜3在通孔60内隔离开的两侧之间存在缝隙，增加了绝缘效果。The size of the separator 3 is larger, and when the separator 3 is set in different shapes or different states, two spaces that are insulated from each other can be effectively formed at the beginning to form an effective isolation between the beginnings of the positive electrode sheet 1 and the negative electrode sheet 2 . The existence of a gap between the two sides of the isolation film 3 isolated in the through hole 60 is avoided, and the insulating effect is increased.
在一个实施例中，如图6所示，所述极耳包括第一极耳41和第二极耳42，所述第一极耳41与所述正极片1电连接，所述第二极耳42与所述 负极片2电连接。In one embodiment, as shown in FIG. 6 , the tab includes a first tab 41 and a second tab 42 , the first tab 41 is electrically connected to the positive electrode sheet 1 , and the second tab is The ears 42 are electrically connected to the negative electrode sheet 2 .
所述绝缘层5包括第一绝缘层和第二绝缘层，所述第一绝缘层包覆所述第一极耳41以及与所述第一极耳41连接的所述正极片1的部分，所述第二绝缘层包覆所述第二极耳42以及与所述第二极耳42连接的所述负极片2的部分。The insulating layer 5 includes a first insulating layer and a second insulating layer, and the first insulating layer covers the first tab 41 and the part of the positive electrode sheet 1 connected to the first tab 41 , The second insulating layer covers the second tab 42 and the part of the negative electrode sheet 2 connected to the second tab 42 .
所述第一极耳41弯折并靠向所述卷绕结构6的一端，所述第二极耳42弯折并靠向所述卷绕结构6的另一端，所述第一极耳41与所述第二极耳42在所述卷绕结构6的横截面上的投影之间的夹角为0°-90°。The first tabs 41 are bent and approach one end of the winding structure 6 , the second tabs 42 are bent and approach the other end of the winding structure 6 , the first tabs 41 The included angle with the projection of the second tab 42 on the cross section of the winding structure 6 is 0°-90°.
在该实施中，第一极耳41设置在正极片1的末端，第二极耳42设置在负极片2的末端。形成卷绕结构6后，负极片2相对于正极片1位于更外层，并且负极片2需要在末端相对于正极片1卷绕更多距离，以使形成的电芯的充放电功能更优。In this implementation, the first tab 41 is disposed at the end of the positive electrode sheet 1 , and the second tab 42 is disposed at the end of the negative electrode sheet 2 . After the winding structure 6 is formed, the negative electrode sheet 2 is located at an outer layer relative to the positive electrode sheet 1, and the negative electrode sheet 2 needs to be wound for more distance relative to the positive electrode sheet 1 at the end, so that the charging and discharging function of the formed cell is better. .
使第一极耳41与第二极耳42在卷绕结构6的横截面上的投影之间的夹角为0°-90°，即负极片2的末端相对于正极片1的末端绕卷绕结构6的外层多卷绕了0°-90°。这样既能够满足最外层的负极片2多于正极片1，同时不需要在周向绕更多尺寸的负极片2，节省了材料，降低成本。The included angle between the projections of the first tab 41 and the second tab 42 on the cross section of the winding structure 6 is 0°-90°, that is, the end of the negative electrode sheet 2 is wound relative to the end of the positive electrode sheet 1 The outer layer of the structure 6 is wound by 0°-90°. In this way, the number of negative electrode sheets 2 in the outermost layer is more than that of positive electrode sheets 1 , and at the same time, there is no need to wrap more negative electrode sheets 2 in the circumferential direction, which saves materials and reduces costs.
在一个实施例中，两个所述隔离膜3为单张隔离膜折叠而成。In one embodiment, the two isolation films 3 are folded from a single isolation film.
例如，两个隔离膜3由一个隔离膜3对折而成，位于两个隔离膜3之间的正极片1或负极片2被对折后的隔离膜3夹持。For example, two separators 3 are formed by folding one separator 3 in half, and the positive electrode sheet 1 or the negative electrode sheet 2 located between the two separators 3 is sandwiched by the folded separators 3 .
一个隔离膜3对折形成两个隔离膜3的结构，能够增加卷绕结构6的结构强度。提高了隔离膜3对正极片1和负极片2形成的绝缘结构的强度，同时提高了卷绕结构6整体的结构强度。One isolation film 3 is folded in half to form a structure of two isolation films 3 , which can increase the structural strength of the winding structure 6 . The strength of the insulating structure formed by the separator 3 for the positive electrode sheet 1 and the negative electrode sheet 2 is improved, and the overall structural strength of the winding structure 6 is improved at the same time.
例如，单个隔离膜3在卷绕结构6卷绕时的始端或末端的位置对折，这样可以有效地在端部形成绝缘效果。也可以在未卷绕时，隔离膜3在正极片1或负极片2的一侧边的位置对折。正极片1和负极片2具有始端和末端的两条边，以及连接始端和末端的两条侧边。For example, a single isolation film 3 is folded in half at the position of the beginning or the end when the winding structure 6 is wound, which can effectively form an insulating effect at the end. When not being wound, the separator 3 may be folded in half at the position of one side of the positive electrode sheet 1 or the negative electrode sheet 2 . The positive electrode sheet 1 and the negative electrode sheet 2 have two sides of the beginning and the end, and two sides connecting the beginning and the end.
例如，单张隔离膜3沿平行于自身的长边对折或者垂直于长边对折。长边即隔离膜3的长度方向的边。For example, the single sheet of separator 3 is folded in half along the long side parallel to itself or perpendicular to the long side. The long side is the side in the longitudinal direction of the separator 3 .
可选地，卷绕结构6采用双针卷绕，形成卷绕结构6后抽走卷针。延 伸于通孔60内的隔离膜3夹持在两个卷针之间，这样能够在卷绕时使隔离膜3的部分结构有效地保持在伸出端部的位置，以在形成卷绕结构6后保持在通孔60内。Optionally, the winding structure 6 is wound with double needles, and the winding needles are withdrawn after the winding structure 6 is formed. The isolation film 3 extending in the through hole 60 is sandwiched between the two winding needles, so that part of the structure of the isolation film 3 can be effectively maintained at the protruding end during winding, so as to form the winding structure 6 and then remain in the through hole 60.
也可以使用单针卷绕，卷绕形成卷绕结构6后抽出卷针。可以根据通孔60内的正极片1和负极片2端部的位置调整隔离膜3伸入通孔60部分的位置。It is also possible to use single-needle winding, which is wound to form the winding structure 6 and then pulled out of the winding needle. The position of the part where the separator 3 protrudes into the through hole 60 can be adjusted according to the positions of the ends of the positive electrode sheet 1 and the negative electrode sheet 2 in the through hole 60 .
在一个实施例中，在所述卷绕结构6的轴向上，所述卷绕结构6的每一端的所述负极片2的尺寸大于所述正极片1的尺寸0.1mm以上。In one embodiment, in the axial direction of the winding structure 6 , the size of the negative electrode sheet 2 at each end of the winding structure 6 is larger than the size of the positive electrode sheet 1 by more than 0.1 mm.
在该实施例中，负极片2相对于正极片1，在卷绕结构6的端部的尺寸更大，使负极片2具有更多体积，满足充放电对负极片2消耗的需求。In this embodiment, the size of the negative electrode sheet 2 at the end of the winding structure 6 is larger than that of the positive electrode sheet 1 , so that the negative electrode sheet 2 has more volume and meets the demand for the consumption of the negative electrode sheet 2 by charging and discharging.
如图1中，在卷绕结构6的上端和下端，负极片2均高于正极片0.1mm以上，以满足储能装置充放电对负极片2消耗的需求。As shown in FIG. 1 , at the upper and lower ends of the winding structure 6 , the negative electrode sheet 2 is higher than the positive electrode sheet by 0.1 mm or more, so as to meet the consumption demand of the negative electrode sheet 2 by the charging and discharging of the energy storage device.
在一个实施例中，在所述卷绕结构6的轴向上，所述卷绕结构6的每一端的所述隔离膜3的尺寸大于所述负极片2的尺寸0.5mm以上。In one embodiment, in the axial direction of the winding structure 6 , the size of the separator 3 at each end of the winding structure 6 is larger than the size of the negative electrode sheet 2 by more than 0.5 mm.
如图1中，在卷绕结构6的上端和下端，隔离膜3均高于负极片0.5mm以上，使隔离膜3能够有效地在卷绕结构6的端部对正极片1与负极片2形成绝缘。As shown in FIG. 1 , at the upper and lower ends of the winding structure 6 , the separator 3 is higher than the negative electrode sheet by more than 0.5 mm, so that the separator 3 can effectively separate the positive electrode sheet 1 and the negative electrode sheet 2 at the end of the winding structure 6 . form insulation.
根据本公开的另一个实施例，提供了一种储能装置，如图7所示，该储能装置包括如上述实施例任意一项所述的电芯和壳体7。According to another embodiment of the present disclosure, an energy storage device is provided. As shown in FIG. 7 , the energy storage device includes the battery cell and the case 7 as described in any one of the foregoing embodiments.
所述卷绕结构6设置在所述壳体7内，所述壳体7与所述极耳焊接，焊接的位置具有两个焊点8，两个所述焊点8之间的距离为0.5mm-5mm。The winding structure 6 is arranged in the casing 7, and the casing 7 is welded with the tabs. The welding position has two welding points 8, and the distance between the two welding points 8 is 0.5 mm-5mm.
在该实施例中，极耳与壳体7通过焊接的方式固定并电连接。例如，通过双针焊的方式固定并电连接。两个焊点8之间的距离为0.5mm-5mm，既能够满足焊接需求，又能够防止焊接位置脱离极耳，以避免虚焊。In this embodiment, the tabs and the housing 7 are fixed and electrically connected by welding. For example, it is fixed and electrically connected by means of two-pin soldering. The distance between the two welding points 8 is 0.5mm-5mm, which can not only meet the welding requirements, but also prevent the welding position from being separated from the tabs, so as to avoid virtual welding.
例如，正极片1上的第一极耳41与壳体7，以及负极片2上的第二极耳42与壳体7焊接时，两个焊点8之间的距离均为0.5mm-5mm。For example, when the first tab 41 on the positive electrode sheet 1 and the casing 7 and the second tab 42 on the negative electrode sheet 2 and the casing 7 are welded, the distance between the two welding points 8 is 0.5mm-5mm .
在一个实施中，如图8所示，所述壳体7包括内壳71和外壳72，所述内壳71和所述外壳72均为一端开口的筒状结构，所述外壳72套设所述内壳71外，以密封所述筒状结构。In one implementation, as shown in FIG. 8 , the casing 7 includes an inner casing 71 and an outer casing 72 . Both the inner casing 71 and the outer casing 72 are cylindrical structures with one end open, and the outer casing 72 is sleeved with a outside the inner shell 71 to seal the cylindrical structure.
所述内壳71与所述外壳72之间设置有密封圈9，所述密封圈9的露出所述外壳72的开口的宽度大于0.5mm。A sealing ring 9 is disposed between the inner casing 71 and the outer casing 72 , and the width of the sealing ring 9 exposing the opening of the outer casing 72 is greater than 0.5 mm.
在该实施例中，密封圈9在内壳71与外壳72之间形成密封以及绝缘。使密封圈9的露出外壳72的开口的宽度大于0.5mm，能够有效地避免外壳72与内壳71接触，提高了绝缘效果。In this embodiment, the sealing ring 9 forms a seal and insulation between the inner casing 71 and the outer casing 72 . The width of the opening of the sealing ring 9 exposing the outer casing 72 is made larger than 0.5 mm, which can effectively prevent the outer casing 72 from contacting the inner casing 71 and improve the insulation effect.
在一个实施中，所述内壳71包括顶板和第一侧壁，所述第一侧壁围绕所述顶板设置，以形成筒状结构。In one implementation, the inner shell 71 includes a top plate and a first side wall, and the first side wall is disposed around the top plate to form a cylindrical structure.
所述外壳72包括底板和第二侧壁，所述第二侧壁围绕所述底板设置，以形成筒状结构。The housing 72 includes a bottom plate and a second side wall disposed around the bottom plate to form a cylindrical structure.
所述第二侧壁套设在所述第一侧壁外，所述密封圈9设置在所述第二侧壁与所述第一侧壁之间，所述第一侧壁与所述第二侧壁之间重叠的区域占比为10％-90％。The second side wall is sleeved outside the first side wall, the sealing ring 9 is arranged between the second side wall and the first side wall, and the first side wall is connected to the first side wall. The overlapping area between the two side walls accounts for 10%-90%.
在该实施例中，第一侧壁和第二侧壁即筒状结构的侧壁位置。第一侧壁和第二侧壁的重叠部分决定这内壳71与外壳72连接的区域面积。通过设置第一侧壁与第二侧壁之间重叠的区域占比为10％-90％，能够有效保障外壳72与内壳71套设在一起的结构强度，并能够保障密封圈9在第一侧壁与第二侧壁之间的密封效果。In this embodiment, the first side wall and the second side wall are the side walls of the cylindrical structure. The overlapping portion of the first side wall and the second side wall determines the area of the area where the inner shell 71 and the outer shell 72 are connected. By setting the ratio of the overlapping area between the first side wall and the second side wall to 10%-90%, the structural strength of the outer casing 72 and the inner casing 71 can be effectively guaranteed, and the sealing ring 9 can be ensured in the first The sealing effect between one side wall and the second side wall.
可选地，正极片1连接的第一极耳41与内壳71上的顶板或外壳72上底板中的一个电连接。负极片2上的第二极耳42与内壳71上的顶板或外壳72上底板中的另一个电连接。Optionally, the first tab 41 connected to the positive electrode sheet 1 is electrically connected to one of the top plate on the inner casing 71 or the bottom plate on the outer casing 72 . The second tab 42 on the negative electrode sheet 2 is electrically connected to the other of the top plate on the inner casing 71 or the bottom plate on the outer casing 72 .
根据本公开的另一个实施例，提供了一种电子设备，该电子设备包括如上任意一实施例所述的储能装置。According to another embodiment of the present disclosure, there is provided an electronic device including the energy storage device according to any one of the above embodiments.
上述实施例中的储能装置用于电子设备，提高了电子设备使用的安全性。例如，电子设备可以是手机、平板电脑、耳机等需要储能装置提供能源的设备。The energy storage device in the above embodiment is used for electronic equipment, which improves the safety of electronic equipment. For example, the electronic equipment may be a mobile phone, a tablet computer, an earphone, or other equipment that requires an energy storage device to provide energy.
上文实施例中重点描述的是各个实施例之间的不同，各个实施例之间不同的优化特征只要不矛盾，均可以组合形成更优的实施例，考虑到行文简洁，在此则不再赘述。The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Repeat.
虽然已经通过示例对本发明的一些特定实施例进行了详细说明，但是 本领域的技术人员应该理解，以上示例仅是为了进行说明，而不是为了限制本发明的范围。本领域的技术人员应该理解，可在不脱离本发明的范围和精神的情况下，对以上实施例进行修改。本发明的范围由所附权利要求来限定。While some specific embodiments of the present invention have been described in detail by way of example, those skilled in the art will appreciate that the above examples are intended to be illustrative only and not intended to limit the scope of the invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the invention is defined by the appended claims.

Claims (14)

  1. 一种电芯，其特征在于，包括正极片、负极片和两个隔离膜；A battery cell is characterized in that it comprises a positive electrode sheet, a negative electrode sheet and two separators;
    所述正极片和所述负极片中的一个位于两个所述隔离膜之间，另一个位于其中一个隔离膜外侧，所述正极片、所述负极片和所述两个隔离膜形成螺旋状的卷绕结构；One of the positive electrode sheet and the negative electrode sheet is located between the two separators, and the other is positioned outside one of the separators, and the positive electrode sheet, the negative electrode sheet, and the two separators form a spiral shape the winding structure;
    所述正极片和/或所述负极片设置有极耳；The positive electrode sheet and/or the negative electrode sheet are provided with tabs;
    还包括绝缘层，所述绝缘层包覆所述极耳以及与所述极耳连接的所述正极片和/或所述负极片的部分。It also includes an insulating layer, the insulating layer covering the tabs and the part of the positive electrode sheet and/or the negative electrode sheet connected with the tabs.
  2. 根据权利要求1所述的电芯，其特征在于，所述正极片和/或所述负极片具有第一连接部，所述极耳与所述第一连接部一一对应，所述极耳具有第二连接部，所述第二连接部与所述第一连接部电连接，所述极耳弯折并靠向所述卷绕结构的端部；The battery cell according to claim 1, wherein the positive electrode sheet and/or the negative electrode sheet has a first connection portion, the tabs correspond to the first connection portions one-to-one, and the tabs having a second connection part, the second connection part is electrically connected with the first connection part, and the tab is bent and pressed against the end of the winding structure;
    所述绝缘层与所述极耳一一对应，所述绝缘层包覆所述极耳的靠向所述卷绕结构的端部的一侧，并延伸至包覆所述第一连接部和所述第二连接部；The insulating layer is in one-to-one correspondence with the tabs, and the insulating layer covers the side of the tab that is close to the end of the winding structure, and extends to cover the first connecting portion and the the second connecting portion;
    所述极耳的背向所述卷绕结构的端部的一侧具有外露区域，所述绝缘层避让所述外露区域。The side of the tab facing away from the end of the winding structure has an exposed area, and the insulating layer avoids the exposed area.
  3. 根据权利要求1或2任意一项所述的电芯，其特征在于，所述极耳位于所述正极片和/或所述负极片的端部，所述绝缘层包覆所述极耳所在的所述正极片和/或所述负极片的端部。The battery cell according to any one of claims 1 or 2, wherein the tab is located at the end of the positive electrode sheet and/or the negative electrode sheet, and the insulating layer covers where the tab is located the end of the positive electrode sheet and/or the negative electrode sheet.
  4. 根据权利要求1-3任意一项所述的电芯，其特征在于，所述卷绕结构的中部形成通孔，在所述卷绕结构的起始端，至少一个所述隔离膜延伸于所述通孔内。The battery cell according to any one of claims 1-3, wherein a through hole is formed in the middle of the winding structure, and at the starting end of the winding structure, at least one of the isolation films extends on the inside the through hole.
  5. 根据权利要求1-4任意一项所述的电芯，其特征在于，所述隔离膜 的位于所述通孔内的部分的横截面呈直线形或者S形。The cell according to any one of claims 1-4, characterized in that, the cross-section of the part of the isolation film located in the through hole is linear or S-shaped.
  6. 根据权利要求1-5任意一项所述的电芯，其特征在于，所述隔离膜的位于所述通孔内的部分沿通孔的径向延伸。The battery cell according to any one of claims 1 to 5, wherein a portion of the isolation film located in the through hole extends along a radial direction of the through hole.
  7. 根据权利要求1-6任意一项所述的电芯，其特征在于，所述极耳包括第一极耳和第二极耳，所述第一极耳与所述正极片电连接，所述第二极耳与所述负极片电连接；The battery cell according to any one of claims 1-6, wherein the tab comprises a first tab and a second tab, the first tab is electrically connected to the positive electrode sheet, and the The second tab is electrically connected to the negative electrode;
    所述绝缘层包括第一绝缘层和第二绝缘层，所述第一绝缘层包覆所述第一极耳以及与所述第一极耳连接的所述正极片的部分，所述第二绝缘层包覆所述第二极耳以及与所述第二极耳连接的所述负极片的部分；The insulating layer includes a first insulating layer and a second insulating layer, the first insulating layer covers the first tab and the part of the positive electrode plate connected to the first tab, the second an insulating layer covers the second tab and the part of the negative electrode sheet connected to the second tab;
    所述第一极耳弯折并靠向所述卷绕结构的一端，所述第二极耳弯折并靠向所述卷绕结构的另一端，所述第一极耳与所述第二极耳在所述卷绕结构的横截面上的投影之间的夹角为0°-90°。The first tab is bent and approached to one end of the winding structure, the second tab is bent and approached to the other end of the winding structure, the first tab and the second tab are The included angle between the projections of the tabs on the cross section of the winding structure is 0°-90°.
  8. 根据权利要求1-7任意一项所述的电芯，其特征在于，两个所述隔离膜为单张隔离膜折叠而成。The battery cell according to any one of claims 1-7, wherein the two isolation films are formed by folding a single isolation film.
  9. 根据权利要求1-8任意一项所述的电芯，其特征在于，在所述卷绕结构的轴向上，所述卷绕结构的每一端的所述负极片的尺寸大于所述正极片的尺寸0.1mm以上。The battery cell according to any one of claims 1-8, characterized in that, in the axial direction of the winding structure, the size of the negative electrode sheet at each end of the winding structure is larger than that of the positive electrode sheet The size of 0.1mm or more.
  10. 根据权利要求1-9任意一项所述的电芯，其特征在于，在所述卷绕结构的轴向上，所述卷绕结构的每一端的所述隔离膜的尺寸大于所述负极片的尺寸0.5mm以上。The battery cell according to any one of claims 1-9, wherein in the axial direction of the winding structure, the size of the separator at each end of the winding structure is larger than that of the negative electrode sheet The size of 0.5mm or more.
  11. 一种储能装置，其特征在于，包括如权利要求1-10任意一项所述的电芯和壳体；An energy storage device, characterized in that it comprises the battery core and the casing according to any one of claims 1-10;
    所述卷绕结构设置在所述壳体内，所述壳体与所述极耳焊接，焊接的 位置具有两个焊点，两个所述焊点之间的距离为0.5mm-5mm。The winding structure is arranged in the casing, the casing is welded with the tab, and the welding position has two welding points, and the distance between the two welding points is 0.5mm-5mm.
  12. 根据权利要求11所述的储能装置，其特征在于，所述壳体包括内壳和外壳，所述内壳和所述外壳均为一端开口的筒状结构，所述外壳套设所述内壳外，以密封所述筒状结构；The energy storage device according to claim 11, wherein the casing comprises an inner casing and an outer casing, the inner casing and the outer casing are both cylindrical structures with one end open, and the outer casing is sleeved on the inner casing outer shell to seal the cylindrical structure;
    所述内壳与所述外壳之间设置有密封圈，所述密封圈的露出所述外壳的开口的宽度大于0.5mm。A sealing ring is arranged between the inner casing and the outer casing, and the width of the opening of the sealing ring exposing the outer casing is greater than 0.5 mm.
  13. 根据权利要求11或12所述的储能装置，其特征在于，所述内壳包括顶板和第一侧壁，所述第一侧壁围绕所述顶板设置，以形成筒状结构；The energy storage device according to claim 11 or 12, wherein the inner case comprises a top plate and a first side wall, and the first side wall is arranged around the top plate to form a cylindrical structure;
    所述外壳包括底板和第二侧壁，所述第二侧壁围绕所述底板设置，以形成筒状结构；the housing includes a bottom plate and a second side wall, the second side wall is disposed around the bottom plate to form a cylindrical structure;
    所述第二侧壁套设在所述第一侧壁外，所述密封圈设置在所述第二侧壁与所述第一侧壁之间，所述第一侧壁与所述第二侧壁之间重叠的区域占比为10％-90％。The second side wall is sleeved outside the first side wall, the sealing ring is arranged between the second side wall and the first side wall, and the first side wall and the second side wall are The area of overlap between the side walls is 10%-90%.
  14. 一种电子设备，其特征在于，包括如权利要求11-13任意一项所述的储能装置。An electronic device, characterized by comprising the energy storage device according to any one of claims 11-13.
PCT/CN2022/087536 2021-04-28 2022-04-19 Cell, energy storage device and electronic apparatus WO2022228194A1 (en)

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