WO2023130861A1 - 用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法 - Google Patents

用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法 Download PDF

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Publication number
WO2023130861A1
WO2023130861A1 PCT/CN2022/135362 CN2022135362W WO2023130861A1 WO 2023130861 A1 WO2023130861 A1 WO 2023130861A1 CN 2022135362 W CN2022135362 W CN 2022135362W WO 2023130861 A1 WO2023130861 A1 WO 2023130861A1
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WIPO (PCT)
Prior art keywords
flap
fold line
battery
sheet
extension
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PCT/CN2022/135362
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English (en)
French (fr)
Inventor
缪伟振
宋书涛
路惠舒
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2023130861A1 publication Critical patent/WO2023130861A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • 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

Definitions

  • the present application relates to the field of battery technology, and in particular to an assembly method for an insulating member for covering a battery cell, an electrode assembly, a battery cell, a battery, an electrical device, and an electrode assembly.
  • a battery pack composed of at least one battery cell needs to be placed in an aluminum casing to complete the assembly.
  • the outside of the battery pack is covered with a Mylar (a tough polyester polymer) film, but there is still the problem of the shell being corroded.
  • Some embodiments of the present application propose an assembly method for an insulating member, an electrode assembly, a battery cell, a battery, an electrical device, and an electrode assembly for covering a battery cell, so as to alleviate the problem of corrosion of the casing.
  • Some embodiments of the present application provide an insulating member for covering electric cores, which includes: a middle flap with a positioning hole; a first flap connected to the middle flap at the first fold line connected, the first flap includes a first main flap, and a side flap connected to the first main flap at a third fold line, the third fold line is perpendicular to the first fold line; the extension sheet , connected to the end of the side flap near the middle flap at the fourth fold line, the fourth fold line is perpendicular to the third fold line; and the second flap is connected to the middle flap at the second fold line
  • the folds are connected, and the second fold line is parallel to the first fold line; wherein, the middle fold is configured to cover the bottom of the cell, and the first fold and the second fold are configured to After being folded, the circumferential side of the electric core is covered, and the extension piece is configured to completely cover the positioning hole after being folded.
  • the side flap of the insulator is connected to the extension piece. After the extension piece is folded, it covers the positioning hole and plays the role of insulation protection. It can prevent the battery part at the positioning hole from contacting the shell, and can catch the pole pieces falling from the battery core.
  • the falling active material prevents the active material from falling on the shell to cause electrochemical corrosion of the shell, and has the function of protecting the performance and safety of the battery cell.
  • the extension piece is configured to not exceed the area between the first fold line and the second fold line in the width direction of the middle fold after being folded along the fourth fold line .
  • the extension sheet After the extension sheet is folded, in the width direction of the middle flap, it does not exceed the area between the first fold line and the second fold line, which is beneficial to ensure that the battery core absorbs the electrolyte in the casing.
  • the distance between the middle fold piece and the first fold line in the width direction is at least 2mm, and the The distance between the second fold lines is at least 2 mm.
  • the maximum width of the extension piece is at least 4 mm smaller than the distance between the first fold line and the second fold line, and the corresponding unilateral gap is greater than or equal to 2 mm, which is beneficial to ensure that the battery absorbs the electrolyte in the casing.
  • the extension piece is configured to cover at least part of the ends along the length direction of the battery core after being folded along the fourth fold line.
  • the extension sheet After the extension sheet is folded, it covers at least part of the end of the battery core along the length direction, which can prevent the end of the battery core in the length direction from contacting the casing, and can catch the activity falling from the end of the battery core along the length direction. material, to prevent the active material from falling into the shell, causing electrochemical corrosion of the shell.
  • the number of the electric cores is multiple, and the extension sheet is configured to cover at least part of the ends along the length direction of each electric core after being folded along the fourth folding line.
  • the extension sheet After the extension sheet is folded, it covers at least part of the ends along the length direction of each battery core, which can prevent the ends of the length direction of each battery core from contacting the casing, and can catch the end parts along the length direction of each battery core. Partially dropped active material, to prevent the active material from falling into the shell, causing electrochemical corrosion of the shell.
  • the length direction of the extension sheet is defined to be perpendicular to the fourth fold line, and the length of the extension sheet is defined as L, and L is not greater than the distance between the first fold line and the second fold line .
  • the length L of the extension piece is not greater than the distance between the first fold line and the second fold line, which can be used for positioning the location of the positioning hole.
  • the length of the extension sheet is L>s+d+x, wherein, s is the minimum distance between the positioning hole and the fourth fold line after the extension sheet is folded along the fourth fold line , d is the diameter of the positioning hole, x is not less than 2mm.
  • the length of the extension piece L>s+d+x can ensure that the extension piece completely covers the positioning hole.
  • the side flaps include a first side flap and a second side flap, the first side and the second side of the first main flap each have a third fold line; the first side The flap is connected to the first main flap at a third fold line on the first side of the first main flap; the second side flap is connected to the third fold line on the second side of the first main flap; The three-fold line is connected with the first main flap; the extension sheet includes a first extension sheet and a second extension sheet, and the first side flap and the second side flap are close to the middle flap Each end has a fourth fold line; the first extension piece is connected to the first side flap at the fourth fold line on the first side flap; the second extension piece is connected to the second side flap The fourth fold line is connected with the second side flap; the positioning hole includes a first positioning hole and a second positioning hole, and the battery core includes a first side, a second side and a bottom; the first An extension sheet is configured to cover at least part of the corners of the first side and the bottom of the cell after being folded, and
  • a first side flap and a second side flap are respectively arranged on both sides of the first main flap, and the first side flap and the second side flap are used to wrap the two ends of the cell in the length direction.
  • the first side flap is connected to the first extension piece
  • the second side flap is connected to the second extension piece.
  • the first extension piece and the second extension piece can cover the corners of the sides and the bottom of the two ends of the battery cell, and are used for covering the insulation.
  • the mechanical equipment automatically grabs the insulating part, which is beneficial to the operation of the covering insulating part.
  • Two positioning holes are set on the insulating part.
  • the first extension piece and the second extension piece can cover one positioning hole respectively, so as to realize the positioning of the battery core. Full coverage.
  • the second flap includes a second main flap, and an overlapping flap connected to the second main flap at a fifth fold line, the overlapping flap and the side flaps Configured to overlap each other when folded, the fifth fold line is perpendicular to the second fold line.
  • the overlapping pieces and side flaps can overlap each other to completely cover the two ends of the cell in the length direction, the middle flap covers the bottom of the cell, and the first main flap and the second main flap are folded. Covering the two sides of the battery core in the width direction can realize the comprehensive covering of the battery core.
  • Some embodiments of the present application also provide an electrode assembly, which includes at least one electric core, and the above-mentioned insulating member, the insulating member is folded to cover at least part of the surface of the at least one electric core.
  • the electrode assembly includes the insulator provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the insulator provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments of the present application also provide a battery cell, which includes a casing and the above-mentioned electrode assembly, and the electrode assembly is arranged in the casing.
  • the battery cell includes the electrode assembly provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the electrode assembly provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments of the present application also provide a battery, which includes a box body and at least one battery cell as described above, and the battery cell is arranged in the box body.
  • the battery includes the battery cell provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery cell provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments of the present application also provide an electric device, which includes the above-mentioned battery.
  • the electric device includes the battery provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments of the present application also provide a method for assembling an electrode assembly, which includes the following steps: providing at least one electric core; providing an insulating member, and the insulating member includes: a middle flap with a positioning hole; the second a flap connected to the middle flap at a first fold line, the first flap including a first main flap, and side flaps connected to the first main flap at a third fold line, The third fold line is perpendicular to the first fold line; the extension piece is connected to an end of the side flap near the middle fold line at a fourth fold line, and the fourth fold line is perpendicular to the third fold line; and a second fold, connected to the middle fold at a second fold line, the second fold line being parallel to the first fold line; placing the at least one electric core on the middle fold, and along the The direction between the first fold line and the second fold line is arranged in order, so that the middle fold covers the bottom of the at least one battery cell; and the first fold and the second fold are folded , making the first flap and the second
  • the middle flap wraps the bottom of the cell
  • the first flap and the second flap wrap the circumferential side of the cell
  • the extension sheet wraps at least part of the corners of the side and the bottom of the cell, and completely covers the positioning hole
  • the insulator can cover the circumferential side, bottom, and corner area of the side and bottom of the cell, and can also cover the positioning holes set by itself, which can cover the cell in all directions to avoid electrochemical corrosion of the shell .
  • the present application at least has the following beneficial effects:
  • the side flaps of the insulator are connected to the extension piece, and the extension piece completely covers the positioning hole after being folded, which plays the role of insulation protection, prevents the battery core at the positioning hole from contacting the housing, and can catch the The active material falling from the pole piece of the battery prevents the active material from falling onto the shell to cause electrochemical corrosion of the shell, and has the function of protecting the performance and safety of the battery.
  • Fig. 1 is a schematic structural view of a vehicle disclosed in some embodiments of the present application.
  • Fig. 2 is a schematic diagram of an exploded structure of a battery disclosed in some embodiments of the present application.
  • Fig. 3 is a schematic diagram of an exploded structure of a battery cell disclosed in some embodiments of the present application.
  • Fig. 4 is a schematic diagram of an unfolded structure of an insulator for covering a battery core disclosed in some embodiments of the present application;
  • Fig. 5 is a schematic diagram of the folding process of an insulator for covering a battery core disclosed in some embodiments of the present application;
  • Fig. 6a is a schematic diagram of an end cap assembly and a cell disclosed in some embodiments of the present application.
  • Fig. 6b is a schematic diagram of an insulator covering a cell disclosed in some embodiments of the present application.
  • Fig. 6c is a schematic side view of an insulator covering a cell disclosed in some embodiments of the present application.
  • Fig. 6d is a schematic bottom view of an electric core covered by an insulating member disclosed in some embodiments of the present application.
  • Fig. 7a is a schematic diagram of an end cap assembly and two electric cores disclosed in some embodiments of the present application.
  • Fig. 7b is a schematic diagram of an insulating member covering two electric cores disclosed in some embodiments of the present application.
  • Fig. 7c is a schematic side view of an insulating member covering two electric cores disclosed in some embodiments of the present application.
  • Fig. 7d is a schematic bottom view of an insulating member covering two electric cores disclosed in some embodiments of the present application.
  • Fig. 8a is a schematic diagram of an end cap assembly and four electric cores disclosed in some embodiments of the present application.
  • Fig. 8b is a schematic diagram of an insulating member covering four electric cores disclosed in some embodiments of the present application.
  • Fig. 8c is a schematic side view of four electric cores covered by an insulating member disclosed in some embodiments of the present application.
  • Fig. 8d is a schematic bottom view of four electric cores covered by an insulating member disclosed in some embodiments of the present application.
  • Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields . With the continuous expansion of power battery application fields, its market demand is also constantly expanding.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for containing battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery of the present application can be used for electric devices, which can provide electric energy for electric devices.
  • Electric devices can be mobile phones, portable devices, notebook computers, battery cars, electric vehicles, ships, spacecraft, electric toys and electric tools, etc.
  • Spacecraft include airplanes, rockets, space shuttles and spaceships, etc.
  • Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.
  • Electric tools include metal cutting electric Tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.
  • the electric device can also be a vehicle 400, such as a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; or the electric device can also be a drone or a ship.
  • vehicle 400 such as a new energy vehicle
  • the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.
  • the electric device can also be a drone or a ship.
  • a vehicle 400 includes an axle 401, a wheel 402 connected to the axle 401, a motor 403, a controller 404 and a battery 300, the motor 403 is used to drive the axle 401 to drive the wheel 402 to rotate, and the controller 404 is used to control the motor 403 works, the battery 300 can be arranged at the bottom, head or tail of the vehicle 400, and is used to provide electric energy for the operation of the motor 403 and other components in the vehicle.
  • the battery 300 includes a case 301 , a cover 302 and at least one battery cell 200 .
  • At least one battery cell 200 includes more than two battery cells 200 , and the multiple battery cells 200 may be connected in series, in parallel, or in parallel.
  • the hybrid connection refers to a mixture of series and parallel connections.
  • both the box body 301 and the cover body 302 are fastened together.
  • both the box body 301 and the cover body 302 can be hollow cuboids and only one face is an opening face, the opening of the box body 301 and the opening of the cover body 302 are arranged oppositely, and the box body 301 and the cover body 302 are interlocked to form a A box with a closed chamber.
  • the box body 301 is a cuboid with an opening and the cover body 302 is a plate shape, or the cover body 302 is a cuboid body with an opening and the box body 301 is a plate shape, and the box body 301 and the cover body 302 are arranged oppositely and snapped together.
  • a box is formed with a closed chamber.
  • a plurality of battery cells 200 are connected in parallel, in series or mixed, and placed in a closed chamber formed by fastening the box body 301 and the cover body 302 .
  • each battery cell 200 includes an electrode assembly 100, a casing 201 and an end cap assembly 202.
  • the casing 201 is determined according to the combined shape of one or more electrode assemblies 100.
  • the casing 201 can be Hollow cuboid or square or cylinder, and one of the faces of the casing 201 has an opening so that one or more electrode assemblies 100 are placed in the casing 201, for example, when the casing 201 is a hollow cuboid or cube, the casing
  • One of the planes of the body 201 is an open surface, that is, the plane does not have a shell wall so that the inside and outside of the shell 201 communicate.
  • the circular side of the shell 201 is an open face, that is, the The circular side does not have a shell wall so that the inside and outside of the shell 201 communicate.
  • the end cap assembly 202 is connected with the casing 201 at the opening of the casing 201 to form a closed casing for placing the electrode assembly 100 , and the casing 201 is filled with electrolyte.
  • the end cover assembly 202 includes an end cover 202a and two terminals 202b.
  • the end cover 202a is basically in the shape of a flat plate.
  • the two terminals 202b are located on the flat surface of the end cover 202a and pass through the flat surface of the end cover 202a.
  • the two terminals 202b are respectively For the positive terminal and the negative terminal.
  • An explosion-proof valve 202c may also be provided on the flat surface of the end cover 202a, and the explosion-proof valve 202c may be a part of the flat surface of the end cover 202a, or may be welded with the flat surface of the end cover 202a.
  • the explosion-proof valve 202c is cracked to cause the inside and outside of the casing to communicate, and the gas is released through the crack of the explosion-proof valve 202c. thereby avoiding an explosion.
  • the electrode assembly 100 includes a plurality of electric cores 101 arranged side by side and electrically connected to each other, and a tab assembly 103, and the tab assembly 103 is connected to a terminal 202b.
  • the tab assembly 103 is formed by folding tabs of a plurality of battery cells 101 .
  • the cell 101 includes a pole piece and a separator, wherein the pole piece includes an anode piece and a cathode piece.
  • Both the anode sheet and the cathode sheet include a current collector and a coating layer.
  • the active material of the anode sheet is coated on the current collector of the anode sheet to form a coating layer
  • the active material of the cathode sheet is coated on the current collector of the cathode sheet to form a coating layer.
  • the isolation film is an insulator, arranged between the anode sheet and the cathode sheet, and the isolation film is used to separate the coating layer of the anode sheet from the coating layer of the cathode sheet.
  • the anode sheet, the separator and the cathode sheet are stacked and wound in sequence to form the cell 101 .
  • the housing 201 is made of metal materials such as aluminum, before the electrode assembly 100 is placed in the housing 201, it is necessary to coat the circumferential side and bottom of the battery pack composed of multiple battery cells 101 made of insulating material.
  • the insulator is used to avoid corrosion of the casing 201 caused by the contact between the electric core 101 and the casing 201 .
  • the inventors have found that although the circumferential sides and bottom of the cell group of the electrode assembly 100 are covered with insulators, at the corners of the side and bottom of the cell, the cell 101 is still easily in contact with the casing 201, resulting in a
  • the body 201 is corroded, and in order to position and install the insulator, a positioning hole needs to be set on the insulator, and after the insulator covers the battery pack, the positioning hole is generally located at the bottom of the battery pack, and some active components on the pole pieces will fall from the positioning hole. Substances cause the shell 201 to overlap with the pole piece, causing electrochemical corrosion to the shell 201 .
  • some embodiments of the present disclosure provide an assembly method for an insulating member, an electrode assembly, a battery cell, a battery, an electrical device, and an electrode assembly for covering a battery cell, by improving the structure of the insulating member itself , so that it can cover the circumferential side, bottom, corners of the side and the bottom of the battery pack, and positioning holes, etc., to alleviate the problem of shell corrosion.
  • the insulating member 102 for covering the electric core includes a middle flap 3 , a first flap 1 , an extension sheet 4 and a second flap 2 .
  • the middle flap 3 is provided with a positioning hole 31 .
  • the first flap 1 is connected to the middle flap 3 at the first fold line 51, the first flap 1 includes the first main flap 11, and the side flaps connected to the first main flap 11 at the third fold line 53 12.
  • the third fold line 53 is perpendicular to the first fold line 51 .
  • the extension sheet 4 is connected to an end of the side flap 12 close to the middle flap 3 at the fourth fold line 54 , and the fourth fold line 54 is perpendicular to the third fold line 53 .
  • the second flap 2 is connected to the middle flap 3 at the second fold line 52 , and the second fold line 52 is parallel to the first fold line 51 .
  • the middle flap 3 is configured to cover the bottom of the cell 101
  • the first flap 1 and the second flap 2 are configured to wrap the circumferential side of the cell 101 after being folded
  • the extension sheet 4 is configured to completely cover the positioning hole 31 after being folded.
  • the insulating member 102 is made of insulating material.
  • insulation 102 comprises a mylar or polypropylene film.
  • the electrode assembly 100 includes a casing 201 and a cell 101 or a plurality of cells 101
  • the casing 201 is made of aluminum, if one cell 101 or a plurality of cells 101 are directly placed in the casing 201, the cell 101 is easy to contact with the shell 201 and cause the shell 201 to corrode, and if only the insulator 102 is used to cover the circumferential side and bottom of the electric core 101, there will still be contact with the shell at the corner of the side and bottom of the electric core 101.
  • the body 201 contacts and corrodes the shell 201, and the corners of the side and the bottom of the battery cell 101 will also drop the active material on the pole piece, causing the shell 201 to overlap with the pole piece, which will cause electrochemical damage to the shell 201.
  • the positioning hole 31 needs to be set on the insulating part 102. After the insulating part 102 covers the electric core 101, the positioning hole 31 is generally located at the bottom of the electric core 101. The active material on the pole piece will also fall from the hole 31 , causing the shell 201 to overlap with the pole piece, and cause electrochemical corrosion to the shell 201 .
  • the side flap 12 of the insulator 102 is connected to the extension sheet 4, and the extension sheet 4 covers at least part of the corners of the side and the bottom of the cell 101 after being folded, and completely covers the positioning hole 31, thereby
  • the role of insulation protection can prevent the side and bottom corners of the battery cell 101, and the battery cell 101 at the positioning hole 31 from contacting the housing 201, and can catch the active material falling from the pole piece of the battery cell 101.
  • the material prevents the active material from falling onto the casing 201 to cause electrochemical corrosion of the casing 201, and has the function of protecting the performance and safety of the battery cell.
  • the middle flap 3 of the insulator 102 in the embodiment of the present disclosure wraps the bottom of the cell 101, and the first flap 1 and the second flap 2 wrap the circumferential side of the cell 101 after being folded, so
  • the insulator 102 provided by the embodiment of the present disclosure can cover the circumferential side, the bottom, and the corner area between the side and the bottom of the electric core 101, and can also cover the positioning hole 31 provided by itself, so that it can cover the electric core 101 in all directions.
  • the core 101 prevents electrochemical corrosion of the casing 201 .
  • the insulating member 102 can be formed by cutting a whole piece of insulating material. By simply cutting the whole piece of insulating material, the middle flap 3 and the extension piece 4 can be cut out, and then the insulation can be folded along the fold line. The insulating member 102 can cover the cell 101 in all directions. The preparation method of the insulating member 102 is simple and has a good protective effect.
  • the entire piece of insulating material has a square shape.
  • Each crease line on the insulating member 102 in this embodiment may be a solid crease, or the crease line may be formed by providing continuous point holes on the insulating member 102 .
  • the extension sheet 4 is configured such that after being folded along the fourth fold line 54 , it does not exceed the area between the first fold line 51 and the second fold line 52 in the width direction of the middle fold sheet 3 .
  • the extension sheet 4 After the extension sheet 4 is folded, in the width direction of the middle flap 3 , it does not exceed the area between the first fold line 51 and the second fold line 52 , which is beneficial to ensure that the battery cell 101 absorbs the electrolyte in the casing 201 .
  • the extension piece 4 is formed by cutting the whole piece of insulating material
  • the width of the extension piece 4 formed after cutting is smaller than the distance between the first fold line 51 and the second fold line 52, therefore, no material is wasted
  • the electrolyte in the casing 201 can pass through the gap between the extension piece 4 and the first fold line 51, and extend
  • the gap between the sheet 4 and the second folding line 52 enters the battery cell 101 , which is also beneficial to ensure that the battery cell 101 absorbs the electrolyte in the casing 201 .
  • the extension sheet 4 Since the width of the extension sheet 4 is smaller than the distance between the first fold line 51 and the second fold line 52, the extension sheet 4 covers part of the corners of the side and the bottom of the cell 101 after being folded, and the extension sheet 4 and the first fold line 51
  • the gap between them, and the gap between the extension sheet 4 and the second fold line 52 mainly refer to the corners of the side and bottom of the battery cell 101 not covered by the extension sheet 4 .
  • the distance between the middle flap 3 and the first fold line 51 in the width direction is at least 2 mm
  • the distance between the second fold line 52 and the second fold line 52 is at least 2 mm. The distance between them should be at least 2mm.
  • the maximum width W of the extension piece 4 is at least 4mm smaller than the distance between the first fold line 51 and the second fold line 52, corresponding to a unilateral gap greater than or equal to 2mm, and the electrolyte in the housing 201 can pass through the extension piece 4 and the first fold line
  • the gap between 51 and the gap between the extension piece 4 and the second folding line 52 enters the cell 101 , which is beneficial to ensure that the cell 101 absorbs the electrolyte in the casing 201 .
  • the extension sheet 4 is configured to cover at least part of the ends of the battery cells 101 along the length direction after being folded along the fourth folding line 54 .
  • the cell 101 is formed by sequentially stacking and winding the anode sheet, the separator and the cathode sheet. It is defined that the corner end of the cell 101 is the end of the cell 101 in the length direction.
  • the dimension between the two flat sides of the battery cell 101 is the width dimension of the battery cell 101
  • the dimension between the two oval end faces of the battery cell 101 is the height dimension of the battery cell 101 .
  • the end of the battery cell 101 in the longitudinal direction is easy to contact with the housing 201, and the active material is easy to drop, and the extension sheet 4 is folded to cover the end of the battery cell 101 in the longitudinal direction.
  • the extension sheet 4 is folded to cover the end of the battery cell 101 in the longitudinal direction. can prevent the end of the battery cell 101 in the length direction from contacting the housing 201, and can catch the active material dropped from the end of the battery cell 101 in the length direction, preventing the active material from falling to the housing 201, so that The casing 201 is galvanically corroded.
  • the number of electric cores 101 is multiple, and the extension sheet 4 is configured to cover the ends of each electric core 101 along the length direction after being folded along the fourth folding line 54. At least partially.
  • the battery cell 101 is formed by stacking and winding the anode sheet, separator and cathode sheet in sequence.
  • the corner end of the battery cell 101 is the end of the length direction of the battery cell 101.
  • the end of the length direction of the battery cell 101 is easy to contact with the casing 201, and the active material is easy to drop.
  • the extension sheet 4 covers the end of each battery cell 101 along the length direction after being folded, which can prevent the length of each battery cell 101
  • the end of the direction is in contact with the housing 201, and can catch the active material falling from the end of each battery cell 101 along the length direction, so as to prevent the active material from falling to the housing 201 and cause electrochemical corrosion of the housing 201. .
  • the ends in the length direction of each battery cell 101 are generally located in the middle area of the middle flap 3 in the width direction.
  • the extension sheet 4 is configured to be located in the middle area of the middle flap 3 in the width direction after being folded along the fourth fold line 54 , and the extension sheet 4 can cover the ends of the battery cells 101 along the length direction.
  • an electric core 101 is covered inside the insulator 102, the width of the extension piece 4 is smaller than the width of one electric core 101, and the extension piece 4 is located in the middle after being folded.
  • the end of the length direction of the battery cell 101 is generally also located in the middle area of the width direction of the middle flap 3.
  • the width of the extension sheet 4 is not less than 100% of the width of the battery cell 101. 1/2, ie W ⁇ (1/2)H, where W is the width of the extension piece 4 and H is the width of a single cell 101 to cover the end of the cell 101 along the length direction.
  • the insulator 102 is covered with two battery cells 101, and the extension sheet 4 is located in the middle area of the width direction of the middle flap 3 after being folded.
  • the width of the extension sheet 4 is not less than 2/3 of the total width of the two cells 101, that is, W ⁇ (2/3)2H, where W is the width of the extension sheet 4, and H is the width of a single cell 101 .
  • the insulator 102 is covered with four battery cells 101, and the extension sheet 4 is located in the middle area of the width direction of the middle flap 3 after being folded. Yes, the width of the extension sheet 4 is not less than 4/5 of the total width of the four cells 101, that is: W ⁇ (4/5)4H, where W is the width of the extension sheet 4, and H is the width of a single cell 101 width.
  • the insulator 102 covers n battery cells 101, and the extension sheet 4 is located in the middle area of the width direction of the middle flap 3 after being folded, and the width of the extension sheet 4 is not less than 1/2 of the total width of the n battery cells 101.
  • n/(n+1) that is, W ⁇ (n/(n+1))nH.
  • W is the width of the extension sheet 4
  • H is the width of a single battery cell 101 .
  • the insulator 102 is covered with n cells 101, and the extension sheet 4 is located in the middle area of the width direction of the middle flap 3 after being folded, and the width of the extension sheet 4 is at least greater than that of n-1 cells. Width, wherein, n is the number of electric cores 101 covered by the insulating member 102, and n is an integer greater than 0.
  • the length direction of the extension sheet 4 is defined to be perpendicular to the fourth fold line 54 , and the length of the extension sheet 4 is defined as L, and L is not greater than the distance between the first fold line 51 and the second fold line 52 .
  • the width of the extension sheet 4 is defined as W.
  • the length L of the extension sheet 4 is not greater than the distance between the first folding line 51 and the second folding line 52 , which can be used for positioning the location of the positioning hole 31 .
  • the extension piece 4 is formed by cutting the entire piece of insulating material
  • the length of the extension piece 4 formed after cutting will naturally be smaller than the distance between the first fold line 51 and the second fold line 52, therefore, in order to make full use of
  • the position of the positioning hole 31 should meet the requirement that the extension piece 4 covers the positioning hole 31 after being folded.
  • the length L of the extension sheet 4 >s+d+x, wherein, s is the minimum distance between the positioning hole 31 and the fourth folding line 54 after the extension sheet 4 is folded along the fourth folding line 54, and d is the positioning hole
  • s is the minimum distance between the positioning hole 31 and the fourth folding line 54 after the extension sheet 4 is folded along the fourth folding line 54
  • d is the positioning hole
  • the diameter of 31, x is not less than 2mm.
  • the length L>s+d+x of the extension piece 4 can ensure that the extension piece 4 completely covers the positioning hole 31 .
  • the maximum value of the length L of the extension piece is equal to the width of the middle flap 3 .
  • the side flap 12 includes a first side flap 12a and a second side flap 12b, and the first side and the second side of the first main flap 11 each have a third fold line 53 .
  • the first side flap 12a is connected to the first main flap 11 at the third fold line 53 on the first side of the first main flap 11 .
  • the second side flap 12b is connected to the first main flap 11 at a third fold line 53 on the second side of the first main flap 11 .
  • the extension sheet 4 includes a first extension sheet 41 and a second extension sheet 42 , and the ends of the first side flap 12 a and the second side flap 12 b near the middle flap each have a fourth fold line 54 .
  • the first extension piece 41 is connected to the first side flap 12a at the fourth fold line 54 on the first side flap 12a.
  • the second extension piece 42 is connected to the second side flap 12b at the fourth fold line 54 on the second side flap 12b.
  • the positioning hole 31 includes a first positioning hole 31a and a second positioning hole 31b, and the battery cell includes a first side, a second side and a bottom.
  • the first extension sheet 41 is configured to cover at least part of the corners of the first side and the bottom of the cell after being folded, and completely cover the first positioning hole 31a.
  • the second extension piece 42 is configured to cover at least part of the corners of the second side and the bottom of the cell after being folded, and completely cover the second positioning hole 31b.
  • a first side flap 12a and a second side flap 12b are respectively arranged on both sides of the first main flap 11, and the first side flap 12a and the second side flap 12b are used to wrap the length direction of the electric core 101. Sides at both ends.
  • the first side flap 12a is connected to the first extension piece 41
  • the second side flap 12b is connected to the second extension piece 42.
  • the first extension piece 41 and the second extension piece 42 can cover the corners of the sides and the bottom of the two ends of the battery cell 101.
  • the insulator 102 is provided with two positioning holes 31, the first extension piece 41 and the second The extension pieces 42 can respectively cover one positioning hole 31 , so as to cover the battery cell 101 in all directions.
  • the second flap 2 includes the second main flap 21, and the lapping piece 22 connected with the second main flap 21 at the fifth fold line 55, the lapping piece 22 and the side flap 12 are
  • the fifth folding line 55 is perpendicular to the second folding line 52 and is configured to overlap each other after being folded.
  • the lapping sheet 22 and the side flaps 12 overlap each other after being folded and can completely cover the two ends of the battery cell 101 in the length direction, the middle flap 3 covers the bottom of the cell 101, the first main flap 11 and the second After being folded, the two main flaps 21 cover the two sides of the battery cell 101 in the width direction, so as to cover the battery cell 101 in all directions.
  • the straps 22 include a first strap 22a and a second strap 22b, and the second main flap 21 has a fifth fold line 55 on both the first side and the second side.
  • the first overlapping piece 22a is connected to the second main flap 21 at the fifth fold line 55 on the first side of the second main flap 21 .
  • the first overlapping piece 22a is configured to overlap with the first side flap 12a after being folded.
  • the second bridging piece 22b is connected to the second main flap 21 at the fifth fold line 55 on the second side of the second main flap 21 .
  • the second overlapping piece 22b is configured to overlap with the second side flap 12b after being folded.
  • Some embodiments also provide an electrode assembly 100 , which includes at least one electric core 101 , and the above-mentioned insulating member 102 , and the insulating member 102 is folded to cover at least part of the surface of the at least one electric core 101 .
  • the electrode assembly 100 includes the insulator 102 provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the insulator 102 provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments also provide a battery cell 200 , which includes a casing 201 and the above-mentioned electrode assembly 100 , and the electrode assembly 100 is disposed in the casing 201 .
  • the battery cell 200 includes the electrode assembly 100 provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the electrode assembly 100 provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments also provide a battery 300 , which includes a box body 301 and at least one battery cell 200 described above, and the battery cell 200 is disposed in the box body 301 .
  • the battery 300 includes the battery cell 200 provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery cell 200 provided by the embodiment of the present disclosure, which will not be repeated here.
  • Some embodiments also provide an electrical device, which includes the above-mentioned battery 300 .
  • the electric device includes the battery 300 provided by the embodiment of the present disclosure, and correspondingly has the beneficial effects of the battery 300 provided by the embodiment of the present disclosure, which will not be repeated here.
  • the electrical device includes a vehicle 400 .
  • Some embodiments also provide a method for assembling an electrode assembly, which includes the following steps:
  • An insulating piece 102 is provided, and the insulating piece 102 includes: a middle flap 3 with a positioning hole 31; a first flap 1 connected to the middle flap 3 at a first fold line 51, and the first flap 1 includes a first The main flap 11, and the side flap 12 connected to the first main flap 11 at the third fold line 53, the third fold line 53 is perpendicular to the first fold line 51; the extension sheet 4 is connected to the side flap at the fourth fold line 54
  • the flap 12 is near one end of the middle flap 3, the fourth fold line 54 is perpendicular to the third fold line 53; and the second flap 2 is connected with the middle flap 3 at the second fold line 52, and the second fold line 52 is parallel to the first fold line.
  • the middle flap 3 wraps the bottom of the cell 101
  • the first flap 1 and the second flap 2 wrap the circumferential sides of the cell 101
  • the extension sheet 4 wraps at least part of the side and the bottom of the cell 101 corner, and completely cover the positioning hole 31
  • the insulator 102 can cover the circumferential side, bottom, and corner area of the side and bottom of the battery cell 101, and can also cover the positioning hole 31 provided by itself, and can cover all directions. Covering the cell 101 prevents electrochemical corrosion of the casing 201 .
  • the insulator 102 used to cover the electric core includes a middle folded piece 3 , a first folded piece 1 , an extension piece 4 and a second folded piece 2 .
  • the first flap 1 is connected to the middle flap 3 at the first fold line 51
  • the second flap 2 is connected to the middle flap 3 at the second fold line 52 .
  • the middle flap 3 is provided with a first positioning hole 31a and a second positioning hole 31b.
  • the first flap 1 includes a first main flap 11 , a first side flap 12 a and a second side flap 12 b, and the first side and the second side of the first main flap 11 each have a third fold line 53 .
  • the first side flap 12a is connected to the first main flap 11 at the third fold line 53 on the first side of the first main flap 11 .
  • the second side flap 12b is connected to the first main flap 11 at a third fold line 53 on the second side of the first main flap 11 .
  • the extension sheet 4 includes a first extension sheet 41 and a second extension sheet 42 , and the ends of the first side flap 12 a and the second side flap 12 b near the middle flap each have a fourth fold line 54 .
  • the first extension piece 41 is connected with the first side flap 12a at the fourth fold line 54 on the first side flap 12a.
  • the second extension piece 42 is connected to the second side flap 12b at the fourth fold line 54 on the second side flap 12b.
  • the second flap 2 includes a second main flap 21 , a first bridging piece 22 a and a second bridging piece 22 b, and the first side and the second side of the second main flap 21 each have a fifth fold line 55 .
  • the first overlapping piece 22a is connected to the second main flap 21 at the fifth fold line 55 on the first side of the second main flap 21 .
  • the second bridging piece 22b is connected to the second main flap 21 at the fifth fold line 55 on the second side of the second main flap 21 .
  • the middle flap 3 wraps the bottom of the battery cell 101, and the first main flap 11 and the second main flap 21 wrap the two sides of the cell 101 in the width direction; the first overlapping sheet 22a overlaps with the first side flap 12a, and the second overlaps 22b overlaps with the second side flap 12b, so as to cover the two sides (the first side and the second side) of the battery cell 101 in the length direction.
  • the first extension sheet 41 covers at least part of the corners of the first side and the bottom of the cell, and completely covers the first positioning hole 31a;
  • the second extension sheet 42 covers the second side and the bottom of the cell At least part of the corner of the bottom completely covers the second positioning hole 31b.
  • FIG. 5 it is the folding process of the insulating part 102, and Fig. 5a shows the unfolded state of the insulating part 102; Fig. 5b shows that the first main flap 11 and the second main flap 21 are folded; Fig. 5c shows It is shown that the first overlapping piece 22a is folded and overlapped with the first side flap 12a, the second overlapping piece 22b is folded and overlapped with the second side flap 12b, and the first extension piece 41 and the second The two extension pieces 42 are folded to complete the folding of the insulating member 102 .
  • FIG. 6 a it is an electric core 101 and an end cap assembly 202 ; as shown in FIG. 6 b , FIG. 6 c and FIG. 6 d , an insulating member 102 covers one electric core 101 .
  • FIG. 7 a there are two electric cores 101 and an end cap assembly 202 ; as shown in FIGS. 7 b , 7 c and 7 d , the insulating member 102 covers the two electric cores 101 .
  • FIG. 8a there are four electric cores 101 and end cap assemblies 202; as shown in FIG. 8b, FIG. 8c and FIG. 8d, the insulating member 102 covers four electric cores 101.

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Abstract

本申请实施例提供一种用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法，其中，绝缘件包括：中间折片，设有定位孔；第一折片，在第一折线处与中间折片连接，第一折片包括第一主折片、以及在第三折线处与第一主折片连接的侧折片；延伸片，在第四折线处连接于侧折片靠近中间折片的一端；以及第二折片，在第二折线处与中间折片连接；其中，中间折片被配置为包覆电芯的底部，第一折片和第二折片被配置为折叠后包覆电芯的周向侧部，延伸片被配置为完全覆盖定位孔。绝缘件能够防止电芯与壳体接触，且能够接住从电芯的极片上掉落的活性物质，避免壳体发生电化学腐蚀。

Description

用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法
相关申请的交叉引用
本申请要求享有于2022年01月10日提交的名称为“用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法”的中国专利申请202210021155.8的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，尤其涉及一种用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法。
背景技术
在电池的制造过程中，至少一个电芯组成的电芯组需要放置在铝质的壳体中以完成组装。为了防止电芯与壳体直接接触，对壳体造成腐蚀，至电芯组的外部包覆有Mylar(一种坚韧聚脂类高分子物)膜，但仍然存在壳体被腐蚀的问题。
发明内容
本申请的一些实施例提出一种用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法，用于缓解壳体被腐蚀的问题。
本申请的一些实施例提供了一种用于包覆电芯的绝缘件，其包括：中间折片，其上设有定位孔；第一折片，在第一折线处与所述中间折片连接，所述第一折片包括第一主折片、以及在第三折线处与所述第一主折片连接的侧折片，所述第三折线与所述第一折线垂直；延伸片，在第四折线处连接于所述侧折片靠近所述中间折片的一端，所述第四折线与所述第三 折线垂直；以及第二折片，在第二折线处与所述中间折片连接，所述第二折线平行于所述第一折线；其中，所述中间折片被配置为包覆电芯的底部，所述第一折片和所述第二折片被配置为折叠后包覆电芯的周向侧部，所述延伸片被配置为折叠后完全覆盖所述定位孔。
绝缘件的侧折片连接延伸片，延伸片折叠后覆盖定位孔，起到绝缘防护的作用，可以防止定位孔处的电芯部位与壳体接触，且能够接住从电芯的极片上掉落的活性物质，避免活性物质掉落至壳体上使壳体发生电化学腐蚀，且具有保护电芯性能和安全的作用。
在一些实施例中，所述延伸片被配置为沿所述第四折线折叠后，在所述中间折片的宽度方向上，不超出所述第一折线与所述第二折线之间的区域。
延伸片折叠后，在中间折片的宽度方向上，不超出第一折线与第二折线之间的区域，有利于保证电芯对壳体内的电解液的吸收。
在一些实施例中，所述延伸片被配置为沿所述第四折线折叠后，在所述中间折片的宽度方向上，与所述第一折线之间的距离至少为2mm，以及与所述第二折线之间的距离至少为2mm。
延伸片的最大宽度比第一折线与第二折线之间的距离至少小4mm，对应单边间隙大于等于2mm，有利于保证电芯对壳体内的电解液的吸收。
在一些实施例中，所述延伸片被配置为沿所述第四折线折叠后，覆盖至少部分所述电芯的沿长度方向的端部。
延伸片折叠后覆盖至少部分电芯的沿长度方向的端部，能够防止电芯的长度方向的端部与壳体接触，且能够接住从电芯的沿长度方向的端部掉落的活性物质，避免活性物质掉落至壳体，使壳体发生电化学腐蚀。
在一些实施例中，所述电芯的数量为多个，所述延伸片被配置为沿所述第四折线折叠后，覆盖每个所述电芯的沿长度方向的端部的至少部分。
延伸片折叠后覆盖每个电芯的沿长度方向的端部的至少部分，能够防止各电芯的长度方向的端部与壳体接触，且能够接住从各电芯的沿长 度方向的端部掉落的活性物质，避免活性物质掉落至壳体，使壳体发生电化学腐蚀。
在一些实施例中，定义所述延伸片的长度方向垂直于所述第四折线，定义所述延伸片的长度为L，L不大于所述第一折线与所述第二折线之间的距离。
由于延伸片折叠后覆盖定位孔，因此，延伸片的长度L不大于第一折线与第二折线之间的距离，能够为定位孔的设置位置进行定位。
在一些实施例中，所述延伸片的长度L>s+d+x，其中，s为所述延伸片沿所述第四折线折叠后，所述定位孔与所述第四折线的最小距离，d为所述定位孔的直径，x不小于2mm。
延伸片的长度L>s+d+x，能够保证延伸片完整覆盖定位孔。
在一些实施例中，所述侧折片包括第一侧折片和第二侧折片，所述第一主折片的第一侧和第二侧均具有第三折线；所述第一侧折片在所述第一主折片的第一侧的第三折线处与所述第一主折片连接；所述第二侧折片在所述第一主折片的第二侧的第三折线处与所述第一主折片连接；所述延伸片包括第一延伸片和第二延伸片，所述第一侧折片和所述第二侧折片靠近所述中间折片的一端均具有第四折线；所述第一延伸片在所述第一侧折片上的第四折线处与所述第一侧折片连接；所述第二延伸片在所述第二侧折片上的第四折线处与所述第二侧折片连接；所述定位孔包括第一定位孔和第二定位孔，所述电芯包括第一侧部、第二侧部和底部；所述第一延伸片被配置为折叠后包覆所述电芯的第一侧部与底部的至少部分拐角，并完全覆盖所述第一定位孔；所述第二延伸片被配置为折叠后包覆所述电芯的第二侧部与底部的至少部分拐角，并完全覆盖所述第二定位孔。
在第一主折片的两侧分别设置第一侧折片和第二侧折片，第一侧折片和第二侧折片用于包覆电芯的长度方向的两端侧部。第一侧折片连接第一延伸片，第二侧折连接第二延伸片，第一延伸片和第二延伸片能够包覆电芯两端侧部与底部的拐角，且为了绝缘件包覆电芯时，机械设备自动抓取绝缘件，且利于操作包覆绝缘件，绝缘件上设置两个定位孔，第一延伸片和第二延伸片能够分别覆盖一个定位孔，实现对电芯的全方位包覆。
在一些实施例中，所述第二折片包括第二主折片、以及在第五折线处与所述第二主折片连接的搭接片，所述搭接片和所述侧折片被配置为折叠后相互搭接，所述第五折线垂直于所述第二折线。
搭接片和侧折片折叠后相互搭接能够完全包覆电芯的长度方向的两端侧部，中间折片包覆电芯的底部，第一主折片和第二主折片折叠后包覆电芯的位于宽度方向的两侧部，能够实现对电芯的全方位包覆。
本申请的一些实施例还提供了一种电极组件，其包括至少一个电芯，以及上述的绝缘件，所述绝缘件折叠以包覆所述至少一个电芯的至少部分表面。
电极组件包括本公开实施例提供的绝缘件，相应的具备本公开实施例提供的绝缘件的有益效果，在此不再赘述。
本申请的一些实施例还提供了一种电池单体，其包括壳体和上述的电极组件，所述电极组件设于所述壳体内。
电池单体包括本公开实施例提供的电极组件，相应的具备本公开实施例提供的电极组件的有益效果，在此不再赘述。
本申请的一些实施例还提供了一种电池，其包括箱体和至少一个上述的电池单体，所述电池单体设于所述箱体内。
电池包括本公开实施例提供的电池单体，相应的具备本公开实施例提供的电池单体的有益效果，在此不再赘述。
本申请的一些实施例还提供了一种用电装置，其包括根据上述的电池。
用电装置包括本公开实施例提供的电池，相应的具备本公开实施例提供的电池的有益效果，在此不再赘述。
本申请的一些实施例还提供了一种电极组件的组装方法，其包括以下步骤：提供至少一个电芯；提供绝缘件，所述绝缘件包括：中间折片，其上设有定位孔；第一折片，在第一折线处与所述中间折片连接，所述第一折片包括第一主折片、以及在第三折线处与所述第一主折片连接的侧折片，所述第三折线与所述第一折线垂直；延伸片，在第四折线处连接于所述侧折片靠近所述中间折片的一端，所述第四折线与所述第三折线垂 直；以及第二折片，在第二折线处与所述中间折片连接，所述第二折线平行于所述第一折线；将所述至少一个电芯放置在所述中间折片上，且沿所述第一折线与所述第二折线之间的方向依次排布，使所述中间折片包覆所述至少一个电芯的底部；以及折叠所述第一折片和所述第二折片，使所述第一折片和所述第二折片包覆所述至少一个电芯的周向侧部，折叠所述延伸片，使所述延伸片完全覆盖所述定位孔。
中间折片包覆电芯的底部，第一折片和第二折片包覆电芯的周向侧部，延伸片包覆电芯的侧部与底部的至少部分拐角，并完全覆盖定位孔，绝缘件能够包覆电芯的周向侧部、底部以及侧部与底部的拐角区域，且还能包覆自身设置的定位孔，能够全方位包覆电芯，避免壳体发生电化学腐蚀。
基于上述技术方案，本申请至少具有以下有益效果：
在一些实施例中，绝缘件的侧折片连接延伸片，延伸片折叠后完全覆盖定位孔，起到绝缘防护的作用，可以防止定位孔处的电芯部位与壳体接触，且能够接住从电芯的极片上掉落的活性物质，避免活性物质掉落至壳体上使壳体发生电化学腐蚀，且具有保护电芯性能和安全的作用。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1是本申请一些实施例公开的一种车辆的结构示意图；
图2是本申请一些实施例公开的一种电池的分解结构示意图；
图3是本申请一些实施例公开的一种电池单体的分解结构示意图；
图4是本申请一些实施例公开的一种用于包覆电芯的绝缘件的展开结构示意图；
图5是本申请一些实施例公开的一种用于包覆电芯的绝缘件的折叠 过程示意图；
图6a是本申请一些实施例公开的端盖组件和一个电芯的示意图；
图6b是本申请一些实施例公开的绝缘件包覆一个电芯的示意图；
图6c是本申请一些实施例公开的绝缘件包覆一个电芯的侧视示意图；
图6d是本申请一些实施例公开的绝缘件包覆一个电芯的仰视示意图；
图7a是本申请一些实施例公开的端盖组件和两个电芯的示意图；
图7b是本申请一些实施例公开的绝缘件包覆两个电芯的示意图；
图7c是本申请一些实施例公开的绝缘件包覆两个电芯的侧视示意图；
图7d是本申请一些实施例公开的绝缘件包覆两个电芯的仰视示意图；
图8a是本申请一些实施例公开的端盖组件和四个电芯的示意图；
图8b是本申请一些实施例公开的绝缘件包覆四个电芯的示意图；
图8c是本申请一些实施例公开的绝缘件包覆四个电芯的侧视示意图；
图8d是本申请一些实施例公开的绝缘件包覆四个电芯的仰视示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：1-第一折片；11-第一主折片；12-侧折片；12a-第一侧折片；12b-第二侧折片；2-第二折片；21-第二主折片；22-搭接片；22a-第一搭接片；22b-第二搭接片；3-中间折片；31-定位孔；31a-第一定位孔；31b-第二定位孔；4-延伸片；41-第一延伸片；42-第二延伸片；51-第一折线；52-第二折线；53-第三折线；54-第四折线；55-第五折线；100-电极组件；101-电芯；102-绝缘件；103-极耳组件；200-电池单体；201-壳体；202-端盖组件；202a-端盖；202b-端子；202c-防爆阀；300-电池；301-箱体；302-盖体；400-车辆；401-车桥；402-车轮；403-马达；404-控制器。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于容纳电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
本申请的电池可用于用电装置，可为用电装置提供电能，用电装置 可以是手机、便携式设备、笔记本电脑、电瓶车、电动汽车、轮船、航天器、电动玩具和电动工具等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等，电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等，电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨。
用电装置还可以是车辆400，例如新能源车辆，新能源车辆可以是纯电动车辆、混合动力车辆或增程式车辆等；或者用电装置也可以是无人机或轮船等。
参考图1，车辆400包括车桥401、连接于车桥401的车轮402、马达403、控制器404和电池300，马达403用于驱动车桥401带动车轮402转动，控制器404用于控制马达403工作，电池300可以设置在车辆400的底部、头部或尾部，用于为马达403以及车辆中其它部件的工作提供电能。
参考图2，电池300包括箱体301、盖体302和至少一个电池单体200。至少一个电池单体200包括两个以上的多个电池单体200，多个电池单体200之间可以串联或并联或混联，混联是指串联和并联的混合。
箱体301和盖体302扣合在一起。例如，箱体301和盖体302均可以为中空长方体且各自只有一个面为开口面，箱体301的开口和盖体302的开口相对设置，并且箱体301和盖体302相互扣合形成具有封闭腔室的箱体。也可以为，箱体301为具有开口的长方体而盖体302为板状，或者盖体302为具有开口的长方体而箱体301为板状，箱体301和盖体302相对设置并扣合而形成具有封闭腔室的箱体。多个电池单体200相互并联或串联或混联组合后，置于箱体301和盖体302扣合后形成的封闭腔室内。
参考图3，每个电池单体200均包括电极组件100、壳体201和端盖组件202，壳体201根据一个或多个电极组件100组合后的形状而定，例如，壳体201可以为中空的长方体或正方体或圆柱体，且壳体201的其中一个面具有一开口以便一个或多个电极组件100放置于壳体201内，例 如，当壳体201为中空的长方体或正方体时，壳体201的其中一个平面为开口面，即该平面不具有壳体壁而使得壳体201内外相通，当壳体201为中空的圆柱体时，壳体201的圆形侧面为开口面，即该圆形侧面不具有壳体壁而使得壳体201内外相通。端盖组件202在壳体201的开口处与壳体201连接形成放置电极组件100的封闭的外壳，且壳体201内填充电解液。
端盖组件202包括端盖202a和两个端子202b，端盖202a基本上是平板形状，两个端子202b位于端盖202a的平板面上且穿过端盖202a的平板面，两个端子202b分别为正极端子和负极端子。
端盖202a的平板面上还可设置防爆阀202c，该防爆阀202c可以为端盖202a的平板面的一部分，也可以与端盖202a的平板面焊接。当电池300产生的气体太多时，气体发生膨胀使外壳内的气压升高至超出预设值时，防爆阀202c裂开而导致外壳内外相通，气体通过防爆阀202c的裂开处向外释放，进而避免发生爆炸。
电极组件100包括多个并排设置且相互电连接的电芯101和极耳组件103，极耳组件103与端子202b连接。极耳组件103是多个电芯101的极耳折叠而成。
电芯101包括极片和隔离膜，其中，极片包括阳极片和阴极片。阳极片和阴极片均包括集流体和涂敷层。阳极片活性物质被涂覆于阳极片的集流体形成涂覆层，阴极片活性物质被涂敷于阴极片的集流体形成涂敷层。隔离膜为绝缘体，设置于阳极片与阴极片之间，隔离膜用于将阳极片的涂敷层和阴极片的涂敷层隔开。阳极片、隔离膜及阴极片依次堆叠并卷绕形成电芯101。
由于壳体201采用铝材等金属材料制成，电极组件100放置于壳体201内之前，需要在多个电芯101组成的电芯组的周向侧部和底部包覆绝缘材质制成的绝缘件，以避免电芯101与壳体201接触导致壳体201腐蚀。
发明人发现，虽然电极组件100的电芯组的周向侧部和底部包覆有绝缘件，但在电芯的侧边与底部的拐角位置，电芯101还是易于与壳体 201接触导致壳体201腐蚀，并且为了定位安装绝缘件，绝缘件上需要设置定位孔，而绝缘件在包覆电芯组后，定位孔一般位于电芯组的底部，定位孔中会落下一些极片上的活性物质，导致壳体201与极片搭接，对壳体201产生电化学腐蚀。
基于此，本公开一些实施例提供了一种用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法，通过对绝缘件的自身结构进行改进，使其能够包覆电芯组的周向侧部、底部、侧部与底部的拐角处，以及定位孔等，用于缓解壳体腐蚀的问题。
参考图4，在一些实施例中，用于包覆电芯的绝缘件102包括中间折片3、第一折片1、延伸片4和第二折片2。
中间折片3上设有定位孔31。
第一折片1在第一折线51处与中间折片3连接，第一折片1包括第一主折片11、以及在第三折线53处与第一主折片11连接的侧折片12，第三折线53与第一折线51垂直。
延伸片4在第四折线54处连接于侧折片12靠近中间折片3的一端，第四折线54与第三折线53垂直。
第二折片2在第二折线52处与中间折片3连接，第二折线52平行于第一折线51。
参考图5，其中，中间折片3被配置为包覆电芯101的底部，第一折片1和第二折片2被配置为折叠后包覆电芯101的周向侧部，延伸片4被配置为折叠后完全覆盖定位孔31。
绝缘件102采用绝缘材料制成。可选地，绝缘件102包括聚酯薄膜或聚丙烯膜。
由于电极组件100包括壳体201和一个电芯101或多个电芯101，壳体201采用铝材制成，一个电芯101或多个电芯101如果直接放置于壳体201内，电芯101容易与壳体201接触导致壳体201腐蚀，而如果仅将绝缘件102包覆电芯101的周向侧部和底部，则电芯101的侧部与底部的拐角处还是会存在与壳体201接触、腐蚀壳体201的问题，且电芯101的侧部与底部的拐角处也会掉落极片上的活性物质，导致壳体201与极片搭 接，对壳体201产生电化学腐蚀，再者，为了实现机械化自动化抓取包覆绝缘件102，绝缘件102上还需要设置定位孔31，绝缘件102包覆电芯101后，定位孔31一般位于电芯101的底部，定位孔31中也会掉落极片上的活性物质，导致壳体201与极片搭接，对壳体201产生电化学腐蚀。
基于此，本公开实施例中，绝缘件102的侧折片12连接延伸片4，延伸片4折叠后包覆电芯101的侧部与底部的至少部分拐角，并完全覆盖定位孔31，起到绝缘防护的作用，可以防止电芯101的侧部与底部拐角处，以及定位孔31处的电芯101部位与壳体201接触，且能够接住从电芯101的极片上掉落的活性物质，避免活性物质掉落至壳体201上使壳体201发生电化学腐蚀，且具有保护电芯性能和安全的作用。
再者，本公开实施例中的绝缘件102的中间折片3包覆电芯101的底部，第一折片1和第二折片2折叠后包覆电芯101的周向侧部，因此，本公开实施例提供的绝缘件102能够包覆电芯101的周向侧部、底部以及侧部与底部的拐角区域，且还能包覆自身设置的定位孔31，能够全方位包覆电芯101，避免壳体201发生电化学腐蚀。
在一些实施例中，绝缘件102可以采用一整块绝缘材料裁剪形成，通过将整块完整的绝缘材料通过简单裁剪，即可裁剪出中间折片3以及延伸片4，然后通过沿折线折叠绝缘件102，即可实现对电芯101的全方位包覆，绝缘件102的制备方法简便，防护效果好。
可选地，整块绝缘材料呈方形。
本实施例中的绝缘件102上的各个折线可以是实体的折痕，或者也可以通过在绝缘件102上设置连续的点孔形成折线。
在一些实施例中，延伸片4被配置为沿第四折线54折叠后，在中间折片3的宽度方向上，不超出第一折线51与第二折线52之间的区域。
延伸片4折叠后，在中间折片3的宽度方向上，不超出第一折线51与第二折线52之间的区域，有利于保证电芯101对壳体201内的电解液的吸收。
在延伸片4通过在整块完整的绝缘材料上裁剪形成的情况下，剪裁后形成的延伸片4的宽度小于第一折线51与第二折线52之间的距离，因 此，既不浪费材料，也不会存在冗余的部分从而阻碍包覆完绝缘件102的电芯101装配进壳体，且壳体201内的电解液能够通过延伸片4与第一折线51之间的间隙，以及延伸片4与第二折线52之间的间隙进入电芯101，也有利于保证电芯101对壳体201内的电解液的吸收。
由于延伸片4的宽度小于第一折线51与第二折线52之间的距离，因此，延伸片4折叠后包覆电芯101的侧部与底部的部分拐角，延伸片4与第一折线51之间的间隙，以及延伸片4与第二折线52之间的间隙主要是指延伸片4未包覆的电芯101的侧部与底部的拐角部分。
在一些实施例中，延伸片4被配置为沿第四折线54折叠后，在中间折片3的宽度方向上，与第一折线51之间的距离至少为2mm，以及与第二折线52之间的距离至少为2mm。
延伸片4的最大宽度W比第一折线51与第二折线52之间的距离至少小4mm，对应单边间隙大于等于2mm，且壳体201内的电解液能够通过延伸片4与第一折线51之间的间隙，以及延伸片4与第二折线52之间的间隙进入电芯101，有利于保证电芯101对壳体201内的电解液的吸收。
参考图6d，在一些实施例中，延伸片4被配置为沿第四折线54折叠后，覆盖至少部分电芯101的沿长度方向的端部。
电芯101通过阳极片、隔离膜及阴极片依次堆叠并卷绕形成，定义：电芯101的拐角端部为电芯101的长度方向的端部。电芯101的两个扁平侧面之间的尺寸为电芯101的宽度尺寸，电芯101的两个椭圆形端面之间的尺寸为电芯101的高度尺寸。
电芯101放置在壳体201内后，电芯101的长度方向的端部容易与壳体201接触，且容易掉落活性物质，延伸片4折叠后覆盖电芯101的沿长度方向的端部，能够防止电芯101的长度方向的端部与壳体201接触，且能够接住从电芯101的沿长度方向的端部掉落的活性物质，避免活性物质掉落至壳体201，使壳体201发生电化学腐蚀。
参考图7d和图8d，在一些实施例中，电芯101的数量为多个，延伸片4被配置为沿第四折线54折叠后，覆盖每个电芯101的沿长度方向的端部的至少部分。
电芯101通过阳极片、隔离膜及阴极片依次堆叠并卷绕形成，电芯101的拐角端部为电芯101的长度方向的端部，多个电芯101放置在壳体201内后，电芯101的长度方向的端部容易与壳体201接触，且容易掉落活性物质，延伸片4折叠后覆盖每个电芯101的沿长度方向的端部，能够防止各电芯101的长度方向的端部与壳体201接触，且能够接住从各电芯101的沿长度方向的端部掉落的活性物质，避免活性物质掉落至壳体201，使壳体201发生电化学腐蚀。
无论绝缘件102包覆一个电芯101还是两个以上电芯101，各电芯101的长度方向的端部一般也位于中间折片3的宽度方向的中部区域。延伸片4被配置为沿第四折线54折叠后，位于中间折片3的宽度方向的中部区域，延伸片4能够覆盖各电芯101的沿长度方向的端部。
参考图6a、图6b、图6c和图6d，在一些实施例中，绝缘件102内包覆一个电芯101，延伸片4的宽度小于一个电芯101的宽度，延伸片4折叠后位于中间折片3的宽度方向的中部区域，电芯101的长度方向的端部一般也位于中间折片3的宽度方向的中部区域，可选的，延伸片4的宽度不小于电芯101的宽度的1/2，即W≥(1/2)H，其中，W为延伸片4的宽度，H为单个电芯101的宽度，以覆盖电芯101的沿长度方向的端部。
参考图7a、图7b、图7c和图7d，在一些实施例中，绝缘件102内包覆两个电芯101，延伸片4折叠后位于中间折片3的宽度方向的中部区域，可选的，延伸片4的宽度不小于两个电芯101的总宽度的2/3，即W≥(2/3)2H，其中，W为延伸片4的宽度，H为单个电芯101的宽度。
参考图8a、图8b、图8c和图8d，在一些实施例中，绝缘件102内包覆四个电芯101，延伸片4折叠后位于中间折片3的宽度方向的中部区域，可选的，延伸片4的宽度不小于四个电芯101的总宽度的4/5，即：W≥(4/5)4H，其中，W为延伸片4的宽度，H为单个电芯101的宽度。
在一些实施例中，绝缘件102内包覆n个电芯101，延伸片4折叠后位于中间折片3的宽度方向的中部区域，延伸片4的宽度不小于n个电芯101总宽度的n/(n+1)，即W≥(n/(n+1))nH。其中，n为绝缘件102 包覆的电芯101的数量，且n取大于0的整数，W为延伸片4的宽度，H为单个电芯101的宽度。
在一些实施例中，绝缘件102内包覆n个电芯101，延伸片4折叠后位于中间折片3的宽度方向的中部区域，延伸片4的宽度至少要大于n-1个电芯的宽度，其中，n为绝缘件102包覆的电芯101的数量，且n取大于0的整数。
在一些实施例中，定义延伸片4的长度方向垂直于第四折线54，定义延伸片4的长度为L，L不大于第一折线51与第二折线52之间的距离。定义延伸片4的宽度为W。
由于延伸片4折叠后覆盖定位孔31，因此，延伸片4的长度L不大于第一折线51与第二折线52之间的距离，能够为定位孔31的设置位置进行定位。
在延伸片4通过在整块完整的绝缘材料上裁剪形成的情况下，剪裁后形成的延伸片4的长度自然会小于第一折线51与第二折线52之间的距离，因此，为充分利用整块完整的绝缘材料，定位孔31的设置位置应满足延伸片4折叠后覆盖定位孔31的要求。
在一些实施例中，延伸片4的长度L>s+d+x，其中，s为延伸片4沿第四折线54折叠后，定位孔31与第四折线54的最小距离，d为定位孔31的直径，x不小于2mm。
延伸片4的长度L>s+d+x，能够保证延伸片4完整覆盖定位孔31。
在延伸片4通过在整块完整的绝缘材料上裁剪形成的情况下，延伸片的长度L的最大值等于中间折片3的宽度。
在一些实施例中，侧折片12包括第一侧折片12a和第二侧折片12b，第一主折片11的第一侧和第二侧均具有第三折线53。
第一侧折片12a在第一主折片11的第一侧的第三折线53处与第一主折片11连接。
第二侧折片12b在第一主折片11的第二侧的第三折线53处与第一主折片11连接。
延伸片4包括第一延伸片41和第二延伸片42，第一侧折片12a和第二侧折片12b靠近中间折片的一端均具有第四折线54。
第一延伸片41在第一侧折片12a上的第四折线54处与第一侧折片12a连接。
第二延伸片42在第二侧折片12b上的第四折线54处与第二侧折片12b连接。
定位孔31包括第一定位孔31a和第二定位孔31b，电芯包括第一侧部、第二侧部和底部。
第一延伸片41被配置为折叠后包覆电芯的第一侧部与底部的至少部分拐角，并完全覆盖第一定位孔31a。
第二延伸片42被配置为折叠后包覆电芯的第二侧部与底部的至少部分拐角，并完全覆盖第二定位孔31b。
在第一主折片11的两侧分别设置第一侧折片12a和第二侧折片12b，第一侧折片12a和第二侧折片12b用于包覆电芯101的长度方向的两端侧部。第一侧折片12a连接第一延伸片41，第二侧折12b连接第二延伸片42，第一延伸片41和第二延伸片42能够包覆电芯101两端侧部与底部的拐角，且为了绝缘件102包覆电芯101时，机械设备自动抓取绝缘件102，且利于操作包覆绝缘件102，绝缘件102上设置两个定位孔31，第一延伸片41和第二延伸片42能够分别覆盖一个定位孔31，实现对电芯101的全方位包覆。
在一些实施例中，第二折片2包括第二主折片21、以及在第五折线55处与第二主折片21连接的搭接片22，搭接片22和侧折片12被配置为折叠后相互搭接，第五折线55垂直于第二折线52。
搭接片22和侧折片12折叠后相互搭接能够完全包覆电芯101的长度方向的两端侧部，中间折片3包覆电芯101的底部，第一主折片11和第二主折片21折叠后包覆电芯101的位于宽度方向的两侧部，能够实现对电芯101的全方位包覆。
在一些实施例中，搭接片22包括第一搭接片22a和第二搭接片22b，第二主折片21的第一侧和第二侧均具有第五折线55。
第一搭接片22a在第二主折片21的第一侧的第五折线55处与第二主折片21连接。第一搭接片22a被配置为折叠后与第一侧折片12a相互搭接。
第二搭接片22b在第二主折片21的第二侧的第五折线55处与第二主折片21连接。第二搭接片22b被配置为折叠后与第二侧折片12b相互搭接。
一些实施例还提供了一种电极组件100，其包括至少一个电芯101，以及上述的绝缘件102，绝缘件102折叠以包覆至少一个电芯101的至少部分表面。
电极组件100包括本公开实施例提供的绝缘件102，相应的具备本公开实施例提供的绝缘件102的有益效果，在此不再赘述。
一些实施例还提供了一种电池单体200，其包括壳体201和上述的电极组件100，电极组件100设于壳体201内。
电池单体200包括本公开实施例提供的电极组件100，相应的具备本公开实施例提供的电极组件100的有益效果，在此不再赘述。
一些实施例还提供了一种电池300，其包括箱体301和至少一个上述的电池单体200，电池单体200设于箱体301内。
电池300包括本公开实施例提供的电池单体200，相应的具备本公开实施例提供的电池单体200的有益效果，在此不再赘述。
一些实施例还提供了一种用电装置，其包括上述的电池300。
用电装置包括本公开实施例提供的电池300，相应的具备本公开实施例提供的电池300的有益效果，在此不再赘述。
可选地，用电装置包括车辆400。
一些实施例还提供了一种电极组件的组装方法，其包括以下步骤：
提供至少一个电芯101；
提供绝缘件102，绝缘件102包括：中间折片3，其上设有定位孔31；第一折片1，在第一折线51处与中间折片3连接，第一折片1包括第一主折片11、以及在第三折线53处与第一主折片11连接的侧折片 12，第三折线53与第一折线51垂直；延伸片4，在第四折线54处连接于侧折片12靠近中间折片3的一端，第四折线54与第三折线53垂直；以及第二折片2，在第二折线52处与中间折片3连接，第二折线52平行于第一折线51；
将至少一个电芯101放置在中间折片3上，且沿第一折线51与第二折线52之间的方向依次排布，使中间折片3包覆至少一个电芯101的底部；以及
折叠第一折片1和第二折片2，使第一折片1和第二折片2包覆至少一个电芯101的周向侧部，折叠延伸片4，使延伸片4完全覆盖定位孔31。
中间折片3包覆电芯101的底部，第一折片1和第二折片2包覆电芯101的周向侧部，延伸片4包覆电芯101的侧部与底部的至少部分拐角，并完全覆盖定位孔31，绝缘件102能够包覆电芯101的周向侧部、底部以及侧部与底部的拐角区域，且还能包覆自身设置的定位孔31，能够全方位包覆电芯101，避免壳体201发生电化学腐蚀。
下面结合附图3至图8d详细描述绝缘件102的一些具体实施例。
如图4所示，用于包覆电芯的绝缘件102包括中间折片3、第一折片1、延伸片4和第二折片2。
第一折片1在第一折线51处与中间折片3连接，第二折片2在第二折线52处与中间折片3连接。中间折片3上设有第一定位孔31a和第二定位孔31b。
第一折片1包括第一主折片11、第一侧折片12a和第二侧折片12b，第一主折片11的第一侧和第二侧均具有第三折线53。第一侧折片12a在第一主折片11的第一侧的第三折线53处与第一主折片11连接。第二侧折片12b在第一主折片11的第二侧的第三折线53处与第一主折片11连接。
延伸片4包括第一延伸片41和第二延伸片42，第一侧折片12a和第二侧折片12b靠近中间折片的一端均具有第四折线54。第一延伸片 41在第一侧折片12a上的第四折线54处与第一侧折片12a连接。第二延伸片42在第二侧折片12b上的第四折线54处与第二侧折片12b连接。
第二折片2包括第二主折片21、第一搭接片22a和第二搭接片22b，第二主折片21的第一侧和第二侧均具有第五折线55。第一搭接片22a在第二主折片21的第一侧的第五折线55处与第二主折片21连接。第二搭接片22b在第二主折片21的第二侧的第五折线55处与第二主折片21连接。
绝缘件102折叠后，中间折片3包覆电芯101的底部，第一主折片11和第二主折片21包覆电芯101的位于宽度方向的两侧部；第一搭接片22a与第一侧折片12a相互搭接，以及第二搭接片22b与第二侧折片12b相互搭接，以包覆电芯101的长度方向的两侧部(第一侧部和第二侧部)；第一延伸片41包覆电芯的第一侧部与底部的至少部分拐角，并完全覆盖第一定位孔31a；第二延伸片42包覆电芯的第二侧部与底部的至少部分拐角，并完全覆盖第二定位孔31b。
如图5所示，为绝缘件102的折叠过程，图5a所示为绝缘件102的展开状态；图5b所示为将第一主折片11和第二主折片21折叠；图5c所示为将第一搭接片22a与第一侧折片12a折叠后相互搭接，将第二搭接片22b与第二侧折片12b折叠后相互搭接，将第一延伸片41和第二延伸片42折叠，完成绝缘件102的折叠。
如图6a所示，为一个电芯101和端盖组件202；如图6b、图6c和图6d所示，绝缘件102包覆一个电芯101。
如图7a所示，为两个电芯101和端盖组件202；如图7b、图7c和图7d所示，绝缘件102包覆两个电芯101。
如图8a所示，为四个电芯101和端盖组件202；如图8b、图8c和图8d所示，绝缘件102包覆四个电芯101。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例， 而是包括落入权利要求的范围内的所有技术方案。

Claims (14)

  1. 一种用于包覆电芯的绝缘件，包括：
    中间折片(3)，其上设有定位孔(31)；
    第一折片(1)，在第一折线(51)处与所述中间折片(3)连接，所述第一折片(1)包括第一主折片(11)、以及在第三折线(53)处与所述第一主折片(11)连接的侧折片(12)，所述第三折线(53)与所述第一折线(51)垂直；
    延伸片(4)，在第四折线(54)处连接于所述侧折片(12)靠近所述中间折片(3)的一端，所述第四折线(54)与所述第三折线(53)垂直；以及
    第二折片(2)，在第二折线(52)处与所述中间折片(3)连接，所述第二折线(52)平行于所述第一折线(51)；
    其中，所述中间折片(3)被配置为包覆电芯(101)的底部，所述第一折片(1)和所述第二折片(2)被配置为折叠后包覆电芯(101)的周向侧部，所述延伸片(4)被配置为折叠后完全覆盖所述定位孔(31)。
  2. 根据权利要求1所述的绝缘件，其中所述延伸片(4)被配置为沿所述第四折线(54)折叠后，在所述中间折片(3)的宽度方向上，不超出所述第一折线(51)与所述第二折线(52)之间的区域。
  3. 根据权利要求1或2所述的绝缘件，其中所述延伸片(4)被配置为沿所述第四折线(54)折叠后，在所述中间折片(3)的宽度方向上，与所述第一折线(51)之间的距离至少为2mm，以及与所述第二折线(52)之间的距离至少为2mm。
  4. 根据权利要求1至3任一项所述的绝缘件，其中所述延伸片(4)被配置为沿所述第四折线(54)折叠后，覆盖至少部分所述电芯(101)的沿 长度方向的端部。
  5. 根据权利要求1至4任一项所述的绝缘件，其中所述电芯(101)的数量为多个，所述延伸片(4)被配置为沿所述第四折线(54)折叠后，覆盖每个所述电芯(101)的沿长度方向的端部的至少部分。
  6. 根据权利要求1至5任一项所述的绝缘件，其中定义所述延伸片(4)的长度方向垂直于所述第四折线(54)，定义所述延伸片(4)的长度为L，L不大于所述第一折线(51)与所述第二折线(52)之间的距离。
  7. 根据权利要求6所述的绝缘件，其中所述延伸片(4)的长度L>s+d+x，其中，s为所述延伸片(4)沿所述第四折线(54)折叠后，所述定位孔(31)与所述第四折线(54)的最小距离，d为所述定位孔(31)的直径，x不小于2mm。
  8. 根据权利要求1至7任一项所述的绝缘件，其中所述侧折片(12)包括第一侧折片(12a)和第二侧折片(12b)，所述第一主折片(11)的第一侧和第二侧均具有第三折线(53)；
    所述第一侧折片(12a)在所述第一主折片(11)的第一侧的第三折线(53)处与所述第一主折片(11)连接；
    所述第二侧折片(12b)在所述第一主折片(11)的第二侧的第三折线(53)处与所述第一主折片(11)连接；
    所述延伸片(4)包括第一延伸片(41)和第二延伸片(42)，所述第一侧折片(12a)和所述第二侧折片(12b)靠近所述中间折片的一端均具有第四折线(54)；
    所述第一延伸片(41)在所述第一侧折片(12a)上的第四折线(54)处与所述第一侧折片(12a)连接；
    所述第二延伸片(42)在所述第二侧折片(12b)上的第四折线(54)处与所述第二侧折片(12b)连接；
    所述定位孔(31)包括第一定位孔(31a)和第二定位孔(31b)，所述电芯包括第一侧部、第二侧部和底部；
    所述第一延伸片(41)被配置为折叠后包覆所述电芯的第一侧部与底部的至少部分拐角，并完全覆盖所述第一定位孔(31a)；
    所述第二延伸片(42)被配置为折叠后包覆所述电芯的第二侧部与底部的至少部分拐角，并完全覆盖所述第二定位孔(31b)。
  9. 根据权利要求1至8任一项所述的绝缘件，其中所述第二折片(2)包括第二主折片(21)、以及在第五折线(55)处与所述第二主折片(21)连接的搭接片(22)，所述搭接片(22)和所述侧折片(12)被配置为折叠后相互搭接，所述第五折线(55)垂直于所述第二折线(52)。
  10. 一种电极组件，包括至少一个电芯(101)，以及根据权利要求1至9任一项所述的绝缘件(102)，所述绝缘件(102)折叠以包覆所述至少一个电芯(101)的至少部分表面。
  11. 一种电池单体，包括壳体(201)和根据权利要求10所述的电极组件(100)，所述电极组件(100)设于所述壳体(201)内。
  12. 一种电池，包括箱体(301)和至少一个根据权利要求11所述的电池单体(200)，所述电池单体(200)设于所述箱体(301)内。
  13. 一种用电装置，包括根据权利要求12所述的电池(300)。
  14. 一种电极组件的组装方法，包括以下步骤：
    提供至少一个电芯(101)；
    提供绝缘件(102)，所述绝缘件(102)包括：中间折片(3)，其上设有定位孔(31)；第一折片(1)，在第一折线(51)处与所述中间折片(3)连接，所述第一折片(1)包括第一主折片(11)、以及在第三折线(53)处与所述第一主折片(11)连接的侧折片(12)，所述第三折线(53)与所述第一折线(51)垂直；延伸片(4)，在第四折线(54)处 连接于所述侧折片(12)靠近所述中间折片(3)的一端，所述第四折线(54)与所述第三折线(53)垂直；以及第二折片(2)，在第二折线(52)处与所述中间折片(3)连接，所述第二折线(52)平行于所述第一折线(51)；
    将所述至少一个电芯(101)放置在所述中间折片(3)上，且沿所述第一折线(51)与所述第二折线(52)之间的方向依次排布，使所述中间折片(3)包覆所述至少一个电芯(101)的底部；以及
    折叠所述第一折片(1)和所述第二折片(2)，使所述第一折片(1)和所述第二折片(2)包覆所述至少一个电芯(101)的周向侧部，折叠所述延伸片(4)，使所述延伸片(4)完全覆盖所述定位孔(31)。
PCT/CN2022/135362 2022-01-10 2022-11-30 用于包覆电芯的绝缘件、电极组件、电池单体、电池、用电装置和电极组件的组装方法 WO2023130861A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205543031U (zh) * 2016-03-22 2016-08-31 东莞塔菲尔新能源科技有限公司 一种裸电芯绝缘片及使用该绝缘片的电池
CN208062159U (zh) * 2018-05-15 2018-11-06 宁德时代新能源科技股份有限公司 二次电池
CN109037509A (zh) * 2016-03-28 2018-12-18 宁德时代新能源科技股份有限公司 二次电池顶盖组件、含该组件的二次电池及装配方法
CN213150885U (zh) * 2020-09-15 2021-05-07 东莞塔菲尔新能源科技有限公司 一种电芯用的绝缘片及动力电池

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