WO2023130358A1 - 电池单体及其制造方法和制造系统、电池以及用电装置 - Google Patents

电池单体及其制造方法和制造系统、电池以及用电装置 Download PDF

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Publication number
WO2023130358A1
WO2023130358A1 PCT/CN2022/070747 CN2022070747W WO2023130358A1 WO 2023130358 A1 WO2023130358 A1 WO 2023130358A1 CN 2022070747 W CN2022070747 W CN 2022070747W WO 2023130358 A1 WO2023130358 A1 WO 2023130358A1
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WO
WIPO (PCT)
Prior art keywords
side plate
electrode assembly
substrate
adhesive
battery cell
Prior art date
Application number
PCT/CN2022/070747
Other languages
English (en)
French (fr)
Inventor
鲁力
张楠
周健
王红
刘江
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/070747 priority Critical patent/WO2023130358A1/zh
Priority to CN202280021843.2A priority patent/CN117044012A/zh
Priority to EP22917830.6A priority patent/EP4369479A1/en
Publication of WO2023130358A1 publication Critical patent/WO2023130358A1/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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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 more specifically, to a battery cell, a manufacturing method and system thereof, a battery, and an electrical device.
  • Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • the battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.
  • the present application provides a battery cell, a manufacturing method and a manufacturing system thereof, a battery and an electrical device, which can improve the safety of the battery cell.
  • the embodiment of the present application provides a battery cell, including a casing, an electrode assembly, an end cover, and an isolation member.
  • the end of the casing along the first direction has an opening
  • the casing includes a first side plate
  • the first side plate includes a first plate body and a second plate body arranged along the second direction
  • the first plate body and the second plate body Welding and forming a welding portion
  • the welding portion extends to the opening
  • the second direction is perpendicular to the first direction.
  • the electrode assembly is housed in the case.
  • the end cap is used to cover the opening.
  • the separation member is disposed between the first side plate and the electrode assembly, and the separation member is attached to the first side plate and covers at least part of the welding portion to separate the electrode assembly from the welding portion.
  • the isolation member can separate the electrode assembly from the welding part, thereby reducing the risk of the electrode assembly being pierced by the welding part and improving safety. Since the isolation member covers at least part of the welding portion, the isolation member can shield the particles remaining on the welding portion, reduce the risk of a short circuit caused by particles falling into the electrode assembly, and improve safety.
  • the spacer member includes a substrate covering at least part of the welding portion, and an adhesive layer positioned between the substrate and the first side plate and bonding the substrate and the first side plate.
  • the adhesive layer can ensure the connection strength between the substrate and the first side plate, and simplify the assembly process of the isolation member and the first side plate.
  • At least a portion of the adhesive layer is adhered to the weld.
  • the adhesive layer is viscous, which can adhere to the particles remaining on the surface of the welding part to fix the particles, reduce the risk of short circuit caused by particles falling into the electrode assembly, and improve safety.
  • the hardness of the substrate is greater than the hardness of the bonding layer.
  • the substrate has greater hardness and is less likely to be pierced by the welded part than the adhesive layer. In this way, the substrate can effectively separate the welded part from the electrode assembly, reducing the risk of short circuit and improving safety.
  • the battery cell further includes an insulating member, which is disposed on a side of the end cap facing the electrode assembly, and is used to insulate and isolate the end cap from the electrode assembly.
  • the insulating member and the substrate are arranged at intervals along the first direction.
  • the insulating member and the substrate are arranged at intervals along the first direction, so as to reduce the risk of interference between the insulating member and the substrate when the insulating member extends into the housing, avoid the substrate being squeezed by the insulating member, and ensure that the substrate is fixed on the first side board.
  • the battery cell further includes an adhesive member, at least part of the adhesive member is located between the first side plate and the insulating member, and is bonded to a portion of the welding portion not covered by the isolation member.
  • the adhesive member can be bonded to the particles remaining on the surface of the welding part, so as to reduce the risk of short circuit caused by the particles falling into the electrode assembly; the adhesive member can also separate the insulating member from the welding part, reducing the The risk of being scratched by the welding part improves safety.
  • the thickness of the bonding member is less than the thickness of the isolation member.
  • the adhesive member has a relatively small thickness, which can reduce the risk of the insulating member pressing the adhesive member during the process of the insulating member extending into the casing, and reduce the possibility of the adhesive member falling off, thereby ensuring safety performance .
  • the bonding member includes a first bonding portion and a second bonding portion arranged continuously, the first bonding portion and the isolation member are arranged along the first direction and used for bonding with the welding portion, and the second bonding portion At least part of the portion is bonded to the surface of the substrate facing the electrode assembly.
  • the first bonding part can be bonded to the part of the welding part not covered by the isolation member, so as to fix the particles remaining on the surface of the welding part, so as to reduce the risk of short circuit caused by particles falling into the electrode assembly. Since the first bonding part is connected to the first side plate and the second bonding part is connected to the substrate, the bonding member can also fix the substrate to the first side plate, improve the connection strength between the first side plate and the substrate, and reduce the thickness of the substrate. risk of shedding.
  • the bonding member and the bonding layer form an integral structure.
  • the above solution can simplify the molding process of the adhesive member and the adhesive layer, and improve the assembly efficiency of the battery cells.
  • the surface of the isolation member facing the first side plate is provided with a recess for receiving at least part of the weld.
  • the concave portion can provide an accommodation space for the welding portion, so as to reduce the contact area and pressure between the welding portion and the isolation member, thereby reducing the risk of the isolation member being pierced by the welding portion.
  • openings are provided on the surface of the isolation member away from the first side plate, and the openings and the welding parts are staggered.
  • the openings can reduce the weight of the isolation member and provide more accommodation space for the electrolyte, so as to improve the performance of the battery cell.
  • the opening and the welding part are staggered to reduce the risk of the welding part passing through the isolation member through the opening and improve safety.
  • openings are formed at both ends of the casing along the first direction, and the casing is a cylindrical structure formed by bending a flat plate, and the interface of the cylindrical structure is welded to form a welding portion.
  • the above solution can simplify the molding process of the shell and ensure the strength of the shell.
  • the housing further includes two second side plates arranged along the second direction, one second side plate is connected to the first plate body through a transition plate, and the other second side plate is connected to the first plate body through another transition plate connected to the second board.
  • the inner surface of the transition plate is an arc surface, and the isolation member supports the electrode assembly, so that the minimum distance between the pole pieces of the electrode assembly and the arc surface is greater than a preset value.
  • the isolation member can support the electrode assembly, so that the minimum distance between the pole piece of the electrode assembly and the arc surface is greater than a preset value, thereby reducing the force transmitted to the end of the pole piece when the battery cell vibrates , reduce the risk of the active material falling off the pole piece, and improve safety.
  • the area of the second side panel is larger than the area of the first side panel.
  • the size of the housing along the first direction is 100mm-2000mm.
  • the size of the battery cells along the first direction is long enough to match the size of the box, and multiple battery cells can be directly arranged side by side in the box without first assembling the battery cells into a battery module.
  • the frame structure for fixing the battery cells in the battery module can be omitted, thereby saving the internal space of the battery, improving the space utilization rate and energy density of the battery, simplifying the assembly process of the battery cells, and reducing costs.
  • the electrode assembly includes multiple first pole pieces and multiple second pole pieces, the multiple first pole pieces and the multiple second pole pieces are alternately stacked along the second direction, the first pole pieces and the second pole pieces The polarity of the pole pieces is reversed.
  • the electrode assembly includes a first pole piece and a plurality of second pole pieces, the first pole piece is bent continuously and includes a plurality of laminated sections and a plurality of bent sections, a plurality of laminated sections and a plurality of second pole pieces The dipole pieces are stacked alternately along the second direction, and each bent section is used to connect two adjacent stacked sections.
  • an embodiment of the present application provides a battery, including a plurality of battery cells in any embodiment of the first aspect.
  • the first side plate is disposed on the lower side of the electrode assembly along the vertical direction.
  • an embodiment of the present application provides an electrical device, including the battery in any embodiment of the second aspect, where the battery is used to provide electrical energy.
  • the embodiment of the present application provides a method for manufacturing a battery cell, including:
  • a casing is provided, the end of the casing along the first direction has an opening, the casing includes a first side plate, the first side plate includes a first plate body and a second plate body arranged along the second direction, the first plate body and the second plate body The second plate body is welded to form a welded portion, the welded portion extends to the opening, and the second direction is perpendicular to the first direction;
  • the isolation member is arranged between the first side plate and the electrode assembly, and separates the electrode assembly from the welding part.
  • the step of providing the isolation member and attaching the isolation member to the first side plate includes: coating the adhesive on the first side plate; providing a substrate, extending the substrate into the casing and bonding the substrate to the adhesive, so that the substrate covers at least part of the soldering portion. After the adhesive is cured, an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • the step of providing the isolation member and attaching the isolation member to the first side plate includes: providing a substrate, and coating the surface of the substrate with an adhesive; extending the substrate into the housing, and making the adhesive The adhesive is bonded to the first side plate and the base plate to cover at least part of the welding portion. After the adhesive is cured, an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • an embodiment of the present application provides a battery cell manufacturing system, including a first providing device, a second providing device, a third providing device, and a fourth providing device.
  • the first providing device is used to provide the casing, the casing has an opening along the end of the first direction, the casing includes a first side plate, and the first side plate includes a first plate body and a second plate body arranged along the second direction , the first plate body and the second plate body are welded to form a welded portion, the welded portion extends to the opening, and the second direction is perpendicular to the first direction.
  • the second providing means is for providing the isolation member and attaching the isolation member to the first side plate so that the isolation member covers at least part of the welded portion.
  • the third providing device is used for providing the electrode assembly and installing the electrode assembly into the casing.
  • the fourth providing device is used for providing the end cover, and covering the end cover with the opening of the casing.
  • the separation member is disposed between the first side plate and the electrode assembly, and separates the electrode assembly from the welding part.
  • the second providing device includes: a first gluing mechanism, used for coating adhesive on the first side plate; a first assembly mechanism, used for providing the substrate, extending the substrate into the housing and adhering connected to the adhesive so that the substrate covers at least part of the soldering portion. After the adhesive is cured, an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • the second providing device includes: a second gluing mechanism, used to provide the substrate, and apply an adhesive on the surface of the substrate; a second assembly mechanism, used to extend the substrate into the housing, and The adhesive is bonded to at least part of the first side plate and the base plate covering the welding portion. After the adhesive is cured, an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • the second gluing mechanism directly coats the adhesive on the substrate without extending into the casing, which can simplify the gluing process and improve the assembly efficiency of the battery cells.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • FIG. 3 is a schematic diagram of a three-dimensional structure of a battery cell provided in some embodiments of the present application.
  • FIG. 4 is a schematic diagram of explosion of the battery cell shown in FIG. 3;
  • FIG. 5 is a schematic cross-sectional view of the battery cell shown in FIG. 3;
  • FIG. 6 is an enlarged schematic view of the battery cell shown in FIG. 5 at the circle frame A;
  • FIG. 7 is another schematic cross-sectional view of the battery cell shown in FIG. 3;
  • FIG. 8 is an enlarged schematic view of the battery cell shown in FIG. 7 at the circle B;
  • FIG. 9 is a schematic partial cross-sectional view of a battery cell provided by another embodiment of the present application.
  • Fig. 10 is a schematic partial cross-sectional view of a battery cell provided in some other embodiments of the present application.
  • FIG. 11 is an enlarged schematic view of the battery cell shown in FIG. 5 at the circle frame C;
  • FIG. 12 is a schematic structural view of an electrode assembly of a battery cell provided in some embodiments of the present application.
  • FIG. 13 is a schematic structural view of an electrode assembly of a battery cell provided in another embodiment of the present application.
  • Fig. 14 is a schematic flowchart of a method for manufacturing a battery cell provided in some embodiments of the present application.
  • Fig. 15 is a schematic block diagram of a battery cell manufacturing system provided by some embodiments of the present application.
  • Fig. 16 is a schematic block diagram of a battery cell manufacturing system provided by other embodiments of the present application.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are for illustrative purposes only, and should not constitute any limitation to the application .
  • “Plurality” in this application refers to two or more (including two).
  • parallel in this application includes not only the absolutely parallel situation, but also the roughly parallel situation that is generally recognized in engineering; at the same time, the "perpendicular” not only includes the absolutely vertical situation, but also includes the roughly parallel situation that is conventionally recognized in engineering. vertical case.
  • the battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc.
  • the embodiment of the present application does not limit this.
  • 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 be a battery module or a battery pack.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece, and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode tab, and the positive electrode current collector is coated with a positive electrode active material layer , the positive electrode tab is not coated with the positive electrode active material layer.
  • the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab, and the negative electrode current collector is coated with a negative electrode active material layer , the negative electrode tab is not coated with the negative electrode active material layer.
  • the material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon.
  • the material of the isolation film may be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the battery cell also includes a casing and an end cover, the casing has an opening, and the end cover covers the opening and is sealingly connected to form a sealed space for accommodating the electrode assembly and the electrolyte.
  • the shell is a hollow structure, which can be made by punching sheet, rolling sheet, welding sheet and so on.
  • some types of casings are formed by rolling sheets, and such casings need to be welded at the interface of the rolled sheets, and the welding will form a weld (eg, a weld seam) on the casing.
  • the surface of the welding part is uneven.
  • the electrode assembly may squeeze the welding part, causing the separator of the electrode assembly to be pierced by the welding part, causing a short circuit and causing a safety risk.
  • other types of shells that need to be formed by welding also have the above-mentioned problems.
  • the embodiment of the present application provides a technical solution, by arranging an isolation member inside the battery cell to cover at least part of the welded part and separate the electrode assembly from the welded part, thereby reducing the number of welded parts of the electrode assembly. Puncture risk, increased safety.
  • Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type 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 electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.
  • the electric device is taken as an example for description.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 .
  • the battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .
  • the vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.
  • the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • the battery 2 includes a case body 5 and a battery cell 6 , and the battery cell 6 is accommodated in the case body 5 .
  • the box body 5 is used to accommodate the battery cells 6, and the box body 5 may have various structures.
  • the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, the first box body part 5a and the second box body part 5a
  • the two box parts 5b jointly define a storage space for accommodating the battery cells 6 .
  • the second box body part 5b can be a hollow structure with an open end, the first box body part 5a is a plate-shaped structure, and the first box body part 5a covers the opening side of the second box body part 5b to form a container with accommodating space.
  • the first casing portion 5a and the second casing portion 5b also can be a hollow structure with one side opening, and the opening side of the first casing portion 5a is covered on the opening side of the second casing portion 5b, To form a box body 5 with an accommodation space.
  • the first box body part 5a and the second box body part 5b can be in various shapes, such as a cylinder, a cuboid, and the like.
  • a sealant such as sealant, sealing ring, etc.
  • a sealant can also be arranged between the first box body part 5a and the second box body part 5b.
  • the first box part 5a covers the top of the second box part 5b
  • the first box part 5a can also be called an upper box cover
  • the second box part 5b can also be called a lower box.
  • the battery 2 there may be one battery cell 6, or there may be a plurality of them. If there are multiple battery cells 6 , the multiple battery cells 6 can be connected in series, in parallel or in parallel.
  • the mixed connection means that the multiple battery cells 6 are both in series and in parallel.
  • a plurality of battery cells 6 can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells 6 is housed in the box body 5; of course, a plurality of battery cells 6 can also be connected in series first Or parallel or mixed connection to form a battery module, multiple battery modules are then connected in series or parallel or mixed to form a whole, and accommodated in the box 5 .
  • the battery unit 6 is directly mounted on the case 5 as a whole. This can save the process of combining multiple battery cells 6 into a battery module, and save the fixing frame for fixing the battery cells 6 in the battery module, which can simplify the structure of the battery and increase the energy density of the battery.
  • Fig. 3 is a schematic diagram of the three-dimensional structure of the battery cell provided by some embodiments of the present application;
  • Fig. 4 is a schematic diagram of the explosion of the battery cell shown in Fig. 3;
  • Fig. 5 is a schematic cross-sectional view of the battery cell shown in Fig. 3;
  • Fig. 6 is an enlarged schematic view of the battery cell shown in FIG. 5 at the circle frame A.
  • the battery cell 6 of the embodiment of the present application includes an electrode assembly 10 , a casing 20 , an end cap 30 and a separation member 40 .
  • the end of the casing 20 along the first direction X has an opening
  • the casing 20 includes a first side plate 21
  • the first side plate 21 includes a first plate body 211 and a second plate body 212 arranged along the second direction Y
  • the second The first plate body 211 and the second plate body 212 are welded to form a welding portion 213
  • the welding portion 213 extends to the opening
  • the second direction Y is perpendicular to the first direction X.
  • the electrode assembly 10 is accommodated in a case 20 .
  • the end cap 30 is used to cover the opening.
  • the isolation member 40 is disposed between the first side plate 21 and the electrode assembly 10 , and the isolation member 40 is attached to the first side plate 21 and covers at least part of the welding part 213 to separate the electrode assembly 10 from the welding part 213 .
  • the casing 20 is a hollow structure, and an accommodating cavity for accommodating the electrode assembly 10 and the electrolyte is formed inside it.
  • the housing 20 can be in various shapes, such as cylinder, cuboid and so on.
  • the shape of the case 20 may be determined according to the specific shape of the electrode assembly 10 . For example, if the electrode assembly 10 has a cylindrical structure, a cylindrical shell can be selected; if the electrode assembly 10 has a rectangular parallelepiped structure, a rectangular parallelepiped shell can be selected.
  • the end cap 30 is sealingly connected with the casing 20 to form a sealed space for accommodating the electrode assembly 10 and the electrolyte.
  • the end cover 30 is connected to the housing 20 by welding, bonding, clamping or other means.
  • one end of the housing 20 along the first direction X has an opening, and one end cover 30 is provided to cover the opening of the housing 20 .
  • both ends of the housing 20 along the first direction X have openings, and there are two end covers 30 , and the two end covers 30 respectively cover the two openings of the housing 20 .
  • the housing 20 can be made of one plate through bending, welding and other processes, or can be welded from multiple plates.
  • both the first board body 211 and the second board body 212 are substantially planar structures, and both the first board body 211 and the second board body 212 are parallel to the first direction X.
  • the welding portion 213 is a bar-shaped structure, and its two ends respectively extend to two edges of the first plate body 211 along the first direction X.
  • the extending direction of the welding portion 213 may be parallel to the first direction X, or intersect with the first direction X. As shown in FIG.
  • the first plate body 211 and the second plate body 212 are butted along the second direction Y, and the laser acts on the butt joint between the first plate body 211 and the second plate body 212 to weld the first plate body 211 and the second plate body 212 to form a welding portion 213 .
  • the first plate body 211 and the second plate body 212 partially overlap in the third direction Z, and the laser acts on the overlapping area between the first plate body 211 and the second plate body 212 to weld the first plate body 211 and the second plate body 212.
  • the first plate body 211 and the second plate body 212 form a welding portion 213 .
  • the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the electrode assembly 10 is the core component for the battery cell 6 to realize the charging and discharging function, and it includes a first pole piece, a second pole piece and a separator, the polarity of the first pole piece and the second pole piece are opposite, and the separator is used to The first pole piece is insulated from the second pole piece.
  • the electrode assembly 10 mainly relies on metal ions to move between the first pole piece and the second pole piece to work.
  • One of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece.
  • the electrode assembly 10 may be a wound structure, a stacked structure or other structures. There may be one or more first pole pieces, and one or more second pole pieces. The number of the first pole piece and the second pole piece can be determined according to the structure of the electrode assembly 10 .
  • Electrodes assembly 10 there can be one electrode assembly 10, or there can be multiple electrodes, which is not limited in this embodiment.
  • Attaching the isolation member 40 on the first side plate 21 refers to forming the isolation member 40 on the first side plate 21 by adhesion, coating, spraying or other means. Through the attachment, the isolation member 40 can be connected with the first side plate 21 , reducing or avoiding the movement of the isolation member 40 relative to the first side plate 21 .
  • the isolation member 40 may be attached to at least one of the first plate body 211 , the second plate body 212 and the welding part 213 .
  • the spacer member 40 may completely cover the welding portion 213 or may cover only a part of the welding portion 213 . Covering in this embodiment refers to covering from the inside.
  • the separation member 40 separates the electrode assembly 10 from the first side plate 21 in the third direction Z.
  • the isolation member 40 is entirely located between the first side plate 21 and the electrode assembly 10 .
  • the casing 20 is prepared through a welding process. Compared with the traditional casing prepared by stamping process, the casing 20 of the embodiment of the present application may have a larger size in the first direction X, so as to increase the capacity of the battery cell 6 .
  • the isolation member 40 can separate the electrode assembly 10 from the welding portion 213 , thereby reducing the risk of the electrode assembly 10 being pierced by the welding portion 213 and improving safety. Since the isolation member 40 covers at least part of the welding portion 213, the isolation member 40 can shield the particles remaining on the welding portion 213, reduce the risk of short circuit caused by particles falling into the electrode assembly 10, and improve safety.
  • the battery cell 6 further includes two electrode terminals 50 installed on the end cap 30, and the two electrode terminals 50 are used to electrically connect with the first pole piece and the second pole piece respectively, so as to connect the electrode assembly 10 The electrical energy generated is exported.
  • the casing 20 has a structure with openings on both sides, and there are two end caps 30 , and the two end caps 30 respectively cover the two openings of the casing 20 .
  • two electrode terminals 50 are installed on the two end caps 30 respectively.
  • the battery cell 6 further includes an insulating sheet 60 wrapped around the outer side of the electrode assembly 10 and used to insulate the electrode assembly 10 from the case 20 .
  • the thickness of the insulating sheet 60 is smaller than that of the spacer member 40 .
  • the size of the housing 20 along the first direction X is 100mm-2000mm.
  • the size of the casing 20 along the first direction X is 100mm, 150mm, 400mm, 600mm, 1000mm, 1200mm, 1500mm or 2000mm.
  • the first direction X is parallel to the length direction of the battery cell 6 .
  • the size of the battery cells 6 along the first direction X is long enough to match the size of the box body, and a plurality of battery cells 6 can be directly arranged side by side in the box body without first installing the battery cells. 6 assembled into a battery module, so that the frame structure for fixing the battery cell 6 in the battery module can be omitted, thereby saving the internal space of the battery, improving the space utilization rate and energy density of the battery, and simplifying the installation of the battery cell 6 Assembly process, reduce cost.
  • the size of the housing 20 along the first direction X is relatively large, and it may be easily broken if it is manufactured by a stamping process; in this embodiment, a large-sized housing 20 is prepared by a welding process, thereby ensuring the 20 strength.
  • openings are formed at both ends of the housing 20 along the first direction X, and the housing 20 is a cylindrical structure formed by bending a flat plate, and the interface of the cylindrical structure is welded to form a welding portion 213 .
  • This embodiment can simplify the molding process of the shell 20 and ensure the strength of the shell 20 .
  • openings are formed at both ends of the housing 20 along the first direction X, and the housing 20 is a cylindrical structure formed by butting two U-shaped plates, and the two interfaces of the cylindrical structure are welded And the welding part 213 is formed.
  • the isolation member 40 includes a substrate 41 and an adhesive layer 42, the substrate 41 covers at least part of the welding portion 213, the adhesive layer 42 is located between the substrate 41 and the first side plate 21 and bonds the substrate 41 and the second side plate 21 One side plate 21.
  • the adhesive layer 42 is bonded to at least one of the first board body 211 , the second board body 212 and the welding portion 213 to connect the substrate 41 to the first side board 21 .
  • the adhesive layer 42 is bonded to the first board body 211 , the second board body 212 and the welding portion 213 at the same time.
  • the fact that the substrate 41 covers at least part of the welding portion 213 means that the projection of the substrate 41 in the third direction Z and the projection of the welding portion 213 in the third direction Z at least partially overlap.
  • the substrate 41 may cover only a part of the soldering portion 213 or completely cover the soldering portion 213 .
  • the adhesive layer 42 can ensure the connection strength between the substrate 41 and the first side plate 21 and simplify the assembly process of the isolation member 40 and the first side plate 21 .
  • an adhesive when assembling the shell 20 and the isolation member 40, an adhesive may be applied on the first side plate 21 first, and then the substrate 41 is inserted into the shell 20 and adhered to the adhesive; After the adhesive is cured, an adhesive layer 42 is formed, and the adhesive layer 42 and the substrate 41 form the isolation member 40 .
  • an adhesive when assembling the housing 20 and the isolation member 40, an adhesive may be coated on the surface of the substrate 41 first, and then the substrate 41 coated with the adhesive is inserted into the housing 20, and The adhesive is bonded to the first side panel 21 ; the adhesive is cured to form an adhesive layer 42 , and the adhesive layer 42 and the substrate 41 form the isolation member 40 .
  • At least a portion of the adhesive layer 42 is adhered to the welding portion 213 .
  • the adhesive layer 42 is viscous, and can adhere to the remaining particles on the surface of the welding portion 213 to fix the particles, reduce the risk of short circuit caused by particles falling into the electrode assembly 10, and improve safety.
  • the hardness of the substrate 41 is greater than that of the adhesive layer 42 .
  • the substrate 41 has greater hardness, and it is less likely to be pierced by the welding part 213 than the adhesive layer 42. In this way, the substrate 41 can effectively separate the welding part 213 from the electrode assembly 10, reducing short circuit risk and improve safety.
  • the thickness of the substrate 41 is greater than the thickness of the adhesive layer 42 .
  • the amount of the adhesive layer 42 can be saved, and the risk of the substrate 41 being pierced by the welding portion 213 can be reduced.
  • the first side plate 21 is disposed on the lower side of the electrode assembly 10 along the vertical direction.
  • the electrode assembly 10 Since the first side plate 21 is located on the lower side of the electrode assembly 10 , the electrode assembly 10 will press the first side plate 21 under the action of gravity of the electrode assembly 10 . If the isolation member 40 is not provided, the electrode assembly 10 is likely to press the welding part 213 under the action of gravity, thereby being pierced by the welding part 213 and causing a risk of short circuit. In the embodiment of the present application, the isolation member 40 is provided to separate the electrode assembly 10 from the first side plate 21 , thereby reducing the risk of the electrode assembly 10 being pierced by the welding portion 213 and improving safety.
  • FIG. 7 is another schematic cross-sectional view of the battery cell shown in FIG. 3 ;
  • FIG. 8 is an enlarged schematic view of the battery cell shown in FIG. 7 at the circle B.
  • the battery cell 6 further includes an insulating member 70, and the insulating member 70 is arranged on the side of the end cap 30 facing the electrode assembly 10, and is used to connect the end cap 30 and the electrode assembly. 10 insulation isolation.
  • the insulating member 70 and the substrate 41 are spaced along the first direction X.
  • the insulating member 70 is used to insulate and isolate the end cap 30 from the electrode assembly 10 to reduce the risk of short circuit.
  • the insulating member 70 can be made of plastic, for example, the insulating member 70 is made of polypropylene.
  • the projection of the insulating member 70 in the third direction Z does not overlap the projection of the substrate 41 in the third direction Z.
  • the insulating member 70 and the substrate 41 are arranged at intervals along the first direction X, so as to reduce the risk of interference between the insulating member 70 and the substrate 41 when the insulating member 70 extends into the housing 20, and avoid the substrate 41 being impacted by the insulating member 70. Squeeze to ensure that the substrate 41 is fixed on the first side plate 21 .
  • the insulating member 70 is pressed against the end surface of the electrode assembly 10 facing the end cap 30 to restrict the electrode assembly 10 in the first direction X, and reduce the shaking amplitude of the electrode assembly 10 when the battery cell 6 vibrates , improve security.
  • the battery cell 6 further includes an adhesive member 80 , at least part of the adhesive member 80 is located between the first side plate 21 and the insulating member 70 , and is bonded to the welded portion not covered by the isolation member 40 . part.
  • the bonding member 80 may be bonded only to the welded portion, or may be bonded to the welded portion, the first plate body, and the second plate body simultaneously.
  • the adhesive member 80 may be an independent member, for example, the adhesive member 80 may be an adhesive tape or an adhesive paper. Alternatively, the adhesive member 80 may also be integrally formed with the adhesive layer 42 .
  • the bonding member 80 can bond to the particles remaining on the surface of the welding part, so as to reduce the risk of short circuit caused by the particles falling into the electrode assembly 10; the bonding member 80 can also connect the insulating member 70 and the welding part The spaced apart reduces the risk of the insulating member 70 being scratched by the welding part and improves safety.
  • the thickness of the bonding member 80 is less than the thickness of the isolation member 40 .
  • the bonding member 80 has a smaller thickness, which can reduce the risk of the insulating member 70 pressing the bonding member 80 during the process of the insulating member 70 extending into the housing 20, and reduce the falling off of the bonding member 80. Possibility to ensure safety performance.
  • bonding member 80 and bonding layer 42 are integrally formed as a structure.
  • the adhesive may be coated on the first side plate 21 first, and the size of the adhesive coated along the first direction X is larger than that of the substrate 41 along the first direction X. size, and then the substrate 41 is inserted into the casing 20 and bonded to the adhesive.
  • the portion of the adhesive that overlaps the substrate 41 forms the adhesive layer 42 after curing, and the portion of the adhesive that does not overlap the substrate 41 forms the adhesive member 80 after curing.
  • This embodiment can simplify the forming process of the adhesive member 80 and the adhesive layer 42 and improve the assembly efficiency of the battery cells 6 .
  • the thickness of the bonding member 80 is equal to the thickness of the bonding layer 42 .
  • At least a portion of the end cap 30 protrudes into the housing 20 through the opening and is welded to the housing 20 .
  • the end of the welding portion near the opening needs to be welded with the end cap 30 , and to avoid interference between the bonding member 80 and the end cap 30 , the bonding member 80 and the end cap 30 are spaced apart in the first direction X.
  • the part of the welding part that needs to be welded with the end cover 30 can be ground by grinding, so as to ensure the strength and sealing of the connection between the end cover 30 and the housing 20 .
  • FIG. 9 is a schematic partial cross-sectional view of a battery cell provided by other embodiments of the present application.
  • the bonding member 80 includes a first bonding portion 81 and a second bonding portion 82 arranged continuously, and the first bonding portion 81 and the isolation member 40 are arranged along the first direction X. And used for bonding with the welding part, at least part of the second bonding part 82 is bonded to the surface of the substrate 41 facing the electrode assembly 10 .
  • the first adhesive part 81 can be bonded to the part of the welding part not covered by the isolation member 40, so as to fix the particles remaining on the surface of the welding part, so as to reduce the possibility of short circuit caused by particles falling into the electrode assembly 10. risk. Since the first bonding portion 81 is connected to the first side plate 21 and the second bonding portion 82 is connected to the base plate 41, the bonding member 80 can also fix the base plate 41 to the first side plate 21, thereby improving the height of the first side plate 21. The strength of the connection with the substrate 41 reduces the risk of the substrate 41 coming off.
  • the bonding member 80 is adhesive tape or glued paper.
  • the adhesive member may also be entirely located on one side of the isolation member along the first direction and connected to the end of the isolation member close to the end cap.
  • FIG. 10 is a schematic partial cross-sectional view of a battery cell provided by some other embodiments of the present application.
  • the surface of the isolation member 40 facing the first side plate 21 is provided with a recess 43 for receiving at least part of the welding portion 213 .
  • the concave portion 43 can provide a receiving space for the welding portion 213 to reduce the contact area and pressure between the welding portion 213 and the isolation member 40 , thereby reducing the risk of the isolation member 40 being pierced by the welding portion 213 .
  • the adhesive layer 42 is a ring structure, and a concave portion 43 is formed in the middle thereof.
  • the ring-shaped adhesive layer 42 can seal some particles remaining on the welding portion 213 in the concave portion 43 , thereby reducing the risk of particles falling into the electrode assembly 10 .
  • openings 44 are formed on the surface of the isolation member 40 away from the first side plate 21 , and the openings 44 and the welding portions 213 are staggered.
  • the opening 44 extends from a surface of the isolation member 40 facing away from the first side plate 21 in a direction facing the first side plate 21 .
  • the opening 44 can be a blind hole or a through hole. There can be one or more openings 44 .
  • the projection of the opening 44 and the projection of the welding portion 213 do not overlap.
  • the opening 44 by setting the opening 44 , the weight of the isolation member 40 can be reduced, and more space can be provided for the electrolyte, so as to improve the performance of the battery cell 6 .
  • the opening 44 and the welding portion 213 are staggered to reduce the risk of the welding portion 213 passing through the isolation member 40 through the opening 44 and improve safety.
  • FIG. 11 is an enlarged schematic view of the battery cell shown in FIG. 5 at the circle C.
  • the casing 20 further includes two second side plates 22 arranged along the second direction Y, and one second side plate 22 is connected to the first plate body through a transition plate 23 , Another second side plate 22 is connected to the second plate body through another transition plate 23 .
  • the inner surface of the transition plate 23 is an arc surface, and the isolation member 40 supports the electrode assembly 10 so that the minimum distance between the electrode piece of the electrode assembly 10 and the arc surface is greater than a preset value.
  • the first plate body is perpendicular to the aforementioned one second side plate 22
  • the second plate body is perpendicular to the aforementioned other second side plate 22
  • the first plate body, the aforementioned second side plate 22, and the aforementioned transition plate 23 are integrally formed
  • the second plate body, the aforementioned other second side plate 22, and the aforementioned other transition plate 23 are integrally formed structure.
  • the transition plate 23 is a rounded corner of the casing 20 formed during the molding process.
  • the sharp corners of the housing 20 can be removed, the stress concentration can be reduced, and the strength of the housing 20 can be improved.
  • the inner surface of the first plate is tangent to the inner surface of the corresponding transition plate 23
  • the second plate is tangent to the inner surface of the corresponding transition plate 23 .
  • the predetermined value varies according to different design requirements.
  • the predetermined value may need to comprehensively consider the shape and size of the casing 20 and the shape and size of the electrode assembly 10 .
  • the predetermined value is 0.1mm-5mm.
  • the electrode assembly 10 may press the inner surface of the transition plate 23 under the action of gravity, and because the inner surface of the transition plate 23 It is a circular arc surface, so under the condition of shock and shock, the inner surface of the transition plate 23 is easy to squeeze the pole piece of the electrode assembly 10, thereby causing the active material of the pole piece to fall off, causing safety hazards.
  • the isolation member 40 of this embodiment can support the electrode assembly 10, so that the minimum distance between the pole piece and the arc surface of the electrode assembly 10 is greater than a preset value, thereby reducing the force transmitted to the end of the pole piece and reducing the pole piece. The risk of the active substance falling off from the tablet improves safety.
  • the radius of the arc surface is R
  • the thickness of the isolation member 40 is T
  • T and R satisfy: 0.5R ⁇ T ⁇ 2R.
  • T/R the smaller the distance between the pole piece and the arc surface, and the greater the pressure on the pole piece when the battery cell 6 vibrates; the larger the value of T/R, the larger the space occupied by the isolation member 40, The lower the utilization rate of the space inside the casing 20 is, the lower the energy density of the battery cells 6 is.
  • the inventor limited the value of T/R to 0.5-2 to balance the safety and energy density of the battery cell 6 .
  • the first side panel 21 and the second side panel 22 are substantially rectangular flat plates.
  • the area of the second side panel 22 is larger than the area of the first side panel 21 .
  • the size of the second side plate 22 along the first direction is equal to the size of the first side plate 21 along the first direction.
  • the housing is generally hollow and cuboid.
  • the casing further includes a third side plate, and the third side plate is opposite to the first side plate 21 along the third direction Z. Both ends of the third side plate along the second direction Y are respectively connected to the two second side plates 22 through two transition plates 23 .
  • the size of the battery cell 6 along the first direction is greater than the size of the battery cell 6 along the second direction Y and the size of the battery cell 6 along the third direction Z.
  • the space reserved by the vehicle for the battery in the vertical direction is limited. Therefore, in order to reduce the height of the battery in the vertical direction, the first direction can be parallel to the horizontal direction, which can reduce the maximum vertical height of the battery. size.
  • the dimension of the battery cell 6 along the third direction Z is greater than the dimension of the battery cell 6 along the second direction Y.
  • the battery cells 6 can be placed sideways; when the battery cells 6 are placed sideways, the third direction Z is parallel to the vertical direction.
  • FIG. 12 is a schematic structural view of an electrode assembly of a battery cell provided by some embodiments of the present application.
  • the electrode assembly 10 includes a plurality of first pole pieces 11 and a plurality of second pole pieces 12 , and a plurality of first pole pieces 11 and a plurality of second pole pieces 12 Alternately stacked along the second direction Y, the polarity of the first pole piece 11 and the second pole piece 12 are opposite.
  • the second direction Y is parallel to the thickness direction of the first pole piece 11 and the thickness direction of the second pole piece 12 .
  • both the first pole piece 11 and the second pole piece 12 are rectangular flat plates and arranged parallel to each other.
  • the electrode assembly 10 will expand. Specifically, the expansion of the first pole piece 11 and the second pole piece 12 in their own thickness direction is the largest, therefore, the expansion of the electrode assembly 10 in the second direction Y is greater than the expansion of the electrode assembly 10 in the third direction Z, The pressing force between the electrode assembly 10 and the first side plate 21 is smaller than the pressing force between the electrode assembly 10 and the second side plate 22 .
  • this embodiment when the casing is prepared, a welding portion is formed on the first side plate 21; compared with the solution of forming a welding portion on the second side plate 22, this embodiment can reduce the impact on the electrode assembly 10 when it expands.
  • the force exerted by the isolation member 40 reduces the risk of the electrode assembly 10 and the isolation member 40 being pierced by the welding part, thereby improving safety.
  • the electrode assembly 10 is generally a cuboid structure, and its surface facing the first side plate 21 is approximately flat, so the space between the electrode assembly 10 and the first side plate 21 is small, and the electrode assembly 10 may be squeezed under the action of gravity.
  • the separation member 40 of this embodiment can support the electrode assembly 10, so as to increase the space between the electrode assembly 10 and the first side plate 21, reduce the force between the pole piece and the arc surface, and reduce the active material of the pole piece. Risk of shedding, improving safety.
  • the electrode assembly 10 further includes an isolation film 13 for insulating and isolating the first pole piece 11 and the second pole piece 12 .
  • FIG. 13 is a schematic structural view of an electrode assembly of a battery cell provided by other embodiments of the present application.
  • the electrode assembly 10 includes a first pole piece 11 and a plurality of second pole pieces 12, the first pole piece 11 is continuously bent and includes a plurality of laminated segments 111 and a plurality of Each bent section 112 , multiple stacked sections 111 and multiple second pole pieces 12 are alternately stacked along the second direction Y, and each bent section 112 is used to connect two adjacent stacked sections 111 .
  • the second direction Y is parallel to the thickness direction of the lamination segment 111 and the thickness direction of the second pole piece 12 .
  • both the lamination section 111 and the second pole piece 12 are rectangular flat plates and arranged parallel to each other.
  • the electrode assembly 10 will expand. Specifically, the expansion of the first pole piece 11 and the second pole piece 12 in their own thickness direction is the largest, therefore, the expansion of the electrode assembly 10 in the second direction Y is greater than the expansion of the electrode assembly 10 in the third direction Z, The pressing force between the electrode assembly 10 and the first side plate 21 is smaller than the pressing force between the electrode assembly 10 and the second side plate 22 .
  • this embodiment when the casing is prepared, a welding portion is formed on the first side plate 21; compared with the solution of forming a welding portion on the second side plate 22, this embodiment can reduce the impact on the electrode assembly 10 when it expands.
  • the force exerted by the isolation member 40 reduces the risk of the electrode assembly 10 and the isolation member 40 being pierced by the welding part, thereby improving safety.
  • the electrode assembly 10 is generally a cuboid structure, and its surface facing the first side plate 21 is approximately flat, so the space between the electrode assembly 10 and the first side plate 21 is small, and the electrode assembly 10 may be squeezed under the action of gravity.
  • the separation member 40 of this embodiment can support the electrode assembly 10, so as to increase the space between the electrode assembly 10 and the first side plate 21, reduce the force between the pole piece and the arc surface, and reduce the active material of the pole piece. Risk of shedding, improving safety.
  • FIG. 14 is a schematic flowchart of a method for manufacturing a battery cell provided by some embodiments of the present application.
  • the manufacturing method of the battery cell in the embodiment of the present application includes:
  • the casing has an opening at the end along the first direction
  • the casing includes a first side plate
  • the first side plate includes a first plate body and a second plate body arranged along the second direction, the first plate
  • the body and the second plate are welded to form a welding portion, the welding portion extends to the opening, and the second direction is perpendicular to the first direction;
  • S200 Provide an isolation member, and attach the isolation member to the first side plate, so that the isolation member covers at least part of the welding portion;
  • S400 Provide an end cover, and cover the end cover with the opening of the housing;
  • the isolation member is arranged between the first side plate and the electrode assembly, and separates the electrode assembly from the welding part.
  • step S200 includes:
  • Step S210 coating the adhesive on the first side plate
  • Step S220 providing a substrate, protruding the substrate into the housing and bonding it with an adhesive, so that the substrate covers at least part of the soldering portion.
  • an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • step S200 includes:
  • Step S230 providing a substrate, and coating the surface of the substrate with an adhesive
  • Step S240 inserting the substrate into the casing, and bonding the adhesive to the first side plate, and the substrate covers at least part of the welding portion.
  • an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • FIG. 15 is a schematic block diagram of a battery cell manufacturing system provided by some embodiments of the present application
  • FIG. 16 is a schematic block diagram of a battery cell manufacturing system provided by other embodiments of the present application.
  • the battery cell manufacturing system 90 of the embodiment of the present application includes a first providing device 91 , a second providing device 92 , a third providing device 93 and a fourth providing device 94 .
  • the first providing device 91 is used to provide the casing, the casing has an opening along the end of the first direction, the casing includes a first side plate, and the first side plate includes a first plate body and a second plate arranged along the second direction body, the first plate body and the second plate body are welded to form a welded portion, the welded portion extends to the opening, and the second direction is perpendicular to the first direction.
  • the second providing device 92 is used for providing the isolation member and attaching the isolation member to the first side plate so that the isolation member covers at least part of the welding portion.
  • the third providing device 93 is used to provide the electrode assembly and install the electrode assembly into the case.
  • the fourth providing device 94 is used to provide the end cover and cover the end cover to the opening of the casing.
  • the separation member is disposed between the first side plate and the electrode assembly, and separates the electrode assembly from the welding part.
  • the second providing device 92 includes a first gluing mechanism 921 and a first assembling mechanism 922 .
  • the first glue applying mechanism 921 is used for applying adhesive on the first side plate.
  • the first assembly mechanism 922 is used to provide the substrate, and the substrate is inserted into the housing and bonded to the adhesive, so that the substrate covers at least part of the soldering portion. After the adhesive is cured, an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • the second providing device 92 includes a second gluing mechanism 923 and a second assembling mechanism 924 .
  • the second gluing mechanism 923 is used to provide the substrate and coat the adhesive on the surface of the substrate.
  • the second assembly mechanism 924 is used to extend the substrate into the casing, and make the adhesive adhere to the first side plate, and the substrate covers at least part of the welding portion. After the adhesive is cured, an adhesive layer is formed, and the adhesive layer and the substrate form an isolation member.
  • the second gluing mechanism 923 directly coats the adhesive on the substrate without extending into the casing, which can simplify the gluing process and improve the assembly efficiency of the battery cells.

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  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本申请实施例提供一种电池单体及其制造方法和制造系统、电池以及用电装置。电池单体包括壳体、电极组件、端盖和隔离构件。壳体沿第一方向的端部具有开口，壳体包括第一侧板，第一侧板包括沿第二方向布置的第一板体和第二板体，第一板体和第二板体焊接并形成焊接部，焊接部延伸至开口处，第二方向垂直于第一方向。电极组件容纳于壳体内。端盖用于盖合于开口。隔离构件设置于第一侧板和电极组件之间，且隔离构件附接于第一侧板并覆盖焊接部的至少部分，以将电极组件和焊接部隔开。在本申请中，隔离构件能够将电极组件和焊接部隔开，从而降低电极组件被焊接部刺破的风险，提高安全性。

Description

电池单体及其制造方法和制造系统、电池以及用电装置 技术领域
本申请涉及电池技术领域，并且更具体地，涉及一种电池单体及其制造方法和制造系统、电池以及用电装置。
背景技术
电池单体广泛用于电子设备，例如手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具等等。电池单体可以包括镉镍电池单体、氢镍电池单体、锂离子电池单体和二次碱性锌锰电池单体等。
在电池技术的发展中，除了提高电池单体的性能外，安全问题也是一个不可忽视的问题。如果电池单体的安全问题不能保证，那该电池单体就无法使用。因此，如何增强电池单体的安全性，是电池技术中一个亟待解决的技术问题。
发明内容
本申请提供了一种电池单体及其制造方法和制造系统、电池以及用电装置，其能提高电池单体的安全性。
第一方面，本申请实施例提供了一种电池单体，包括壳体、电极组件、端盖和隔离构件。壳体沿第一方向的端部具有开口，壳体包括第一侧板，第一侧板包括沿第二方向布置的第一板体和第二板体，第一板体和第二板体焊接并形成焊接部，焊接部延伸至开口处，第二方向垂直于第一方向。电极组件容纳于壳体内。端盖用于盖合于开口。隔离构件设置于第一侧板和电极组件之间，且隔离构件附接于第一侧板并覆盖焊接部的至少部分，以将电极组件和焊接部隔开。
上述方案中，隔离构件能够将电极组件和焊接部隔开，从而降低电极组件被焊接部刺破的风险，提高安全性。由于隔离构件覆盖焊接部的至少部分，所以隔离构件能够遮挡焊接部上残留的颗粒，降低因颗粒掉落到电极组件内而引发短路的风险，提高安全性。
在一些实施方式中，隔离构件包括基板和粘接层，基板覆盖焊接部的至少部分，粘接层位于基板和第一侧板之间并粘接基板和第一侧板。
上述方案中，粘接层可以保证基板和第一侧板之间的连接强度，并简化隔离构件和第一侧板的装配工艺。
在一些实施方式中，粘接层的至少部分粘接于焊接部。
上述方案中，粘接层具有粘性，其能够粘合于焊接部表面残留的颗粒，以固定颗粒，降低因颗粒掉入电极组件内而引发短路的风险，提高安全性。
在一些实施方式中，基板的硬度大于粘接层的硬度。
上述方案中，基板具有较大的硬度，其相对于粘接层更不易被焊接部刺破，这样，基板可以有效地将焊接部和电极组件隔开，降低短路风险，提高安全性。
在一些实施方式中，电池单体还包括绝缘构件，绝缘构件设置于端盖面向电极组件的一侧，并用于将端盖和电极组件绝缘隔离。绝缘构件和基板沿第一方向间隔设置。
上述方案将绝缘构件和基板沿第一方向间隔设置，以在绝缘构件伸入壳体的过程中降低绝缘构件与基板干涉的风险，避免基板受到绝缘构件的挤压，保证基板固定在第一侧板上。
在一些实施方式中，电池单体还包括粘接构件，粘接构件的至少部分位于第一侧板和绝缘构件之间，并粘接于焊接部未被隔离构件覆盖的部分。
上述方案中，粘接构件能够粘合于焊接部表面残留的颗粒，以降低因颗粒掉入电极组件内而引发短路的风险；粘接构件还能够将绝缘构件和焊接部隔开，降低绝缘构件被焊接部划伤的风险，提高安全性。
在一些实施方式中，粘接构件的厚度小于隔离构件的厚度。
上述方案中，粘接构件具有较小的厚度，这样可以在绝缘构件伸入壳体的过程中降低绝缘构件挤压粘接构件的风险，减小粘接构件脱落的可能性，进而保证安全性能。
在一些实施方式中，粘接构件包括连续设置的第一粘接部和第二粘接部，第一粘接部和隔离构件沿第一方向布置并用于与焊接部粘接，第二粘接部的至少部分粘接于基板面向电极组件的表面。
上述方案中，第一粘接部能够粘接于焊接部未被隔离构件覆盖的部分，从而固定焊接部表面残留的颗粒，以降低因颗粒掉入电极组件内而引发短路的风险。由于第一粘接部与第一侧板相连而第二粘接部与基板相连，所以粘接构件还能够将基板固定到第一侧板，提高第一侧板和基板的连接强度，降低基板脱落的风险。
在一些实施方式中，粘接构件和粘接层为一体形成结构。
上述方案能够简化粘接构件和粘接层的成型工艺，提高电池单体的装配效率。
在一些实施方式中，隔离构件的面向第一侧板的表面设有凹部，凹部用于容纳焊接部的至少部分。
上述方案中，凹部能够为焊接部提供容纳空间，以减小焊接部与隔离构件之间的接触面积以及压力，从而降低隔离构件被焊接部刺破的风险。
在一些实施方式中，隔离构件的背离第一侧板的表面设有开孔，开孔与焊接部错开设置。
上述方案中，开孔可以降低隔离构件的重量，并为电解液提供更多的容纳空间，以改善电池单体的性能。上述方案将开孔与焊接部错开设置，以降低焊接部经由开孔穿过隔离构件的风险，提高安全性。
在一些实施方式中，壳体沿第一方向的两端均形成开口，且壳体为通过弯折平板形成的筒状结构，筒状结构的接口处焊接并形成焊接部。
上述方案可以简化壳体的成型工艺，并保证壳体的强度。
在一些实施方式中，壳体还包括沿第二方向布置的两个第二侧板，一个第二侧板通过一个过渡板连接于第一板体，另一个第二侧板通过另一个过渡板连接于第二板体。过渡板的内表面为圆弧面，隔离构件支撑电极组件，以使电极组件的极片与圆弧面之间的最小间距大于预设值。
上述方案中，隔离构件能够支撑电极组件，使电极组件的极片与圆弧面之间的最小间距大于预设值，进而在电池单体震动时减小传递到极片的端部的作用力，降低极片的活性物质脱落的风险，提高安全性。
在一些实施方式中，第二侧板的面积大于第一侧板的面积。
在一些实施方式中，壳体沿第一方向的尺寸为100mm-2000mm。
上述方案中，电池单体的沿第一方向的尺寸足够长，能够与箱体的尺寸相匹配，多个电池单体可以直接并列布置在箱体内，无需先将电池单体组装成电池模块，这样可以省去电池模块中的用于固定电池单体的框架结构，从而节省了电池的内部空间，提高了电池的空间利用率和能量密度，简化电池单体的组装工艺，降低成本。
在一些实施方式中，电极组件包括多个第一极片和多个第二极片，多个第一极片和多个第二极片沿第二方向交替层叠，第一极片和第二极片的极性相反。在另一些实施方式中，电极组件包括第一极片和多个第二极片，第一极片连续弯折且包括多个层叠段和多个折弯段，多个层叠段和多个第二极片沿第二方向交替层叠，各折弯段用于连接相邻的两个层叠段。
第二方面，本申请实施例提供了一种电池，包括多个第一方面任一实施例的电池单体。
在一些实施方式中，在至少一个电池单体中，第一侧板设置于电极组件沿竖直方向的下侧。
第三方面，本申请实施例提供了一种用电装置，包括第二方面任一实施例的电池，电池用于提供电能。
第四方面，本申请实施例提供了一种电池单体的制造方法，包括：
提供壳体，壳体沿第一方向的端部具有开口，壳体包括第一侧板，第一侧板包括沿第二方向布置的第一板体和第二板体，第一板体和第二板体焊接并形成焊接部，焊接部延伸至开口处，第二方向垂直于第一方向；
提供隔离构件，并将隔离构件附接于第一侧板，以使隔离构件覆盖焊接部的至少部分；
提供电极组件，并将电极组件安装到壳体内；
提供端盖，并将端盖盖合于壳体的开口；
其中，隔离构件设置于第一侧板和电极组件之间，并将电极组件和焊接部隔开。
在一些实施方式中，提供隔离构件，并将隔离构件附接于第一侧板的步骤包括：在第一侧板上涂覆粘接剂；提供基板，将基板伸入壳体内并粘接于粘接剂，以使基板 覆盖焊接部的至少部分。粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
在另一些实施方式中，提供隔离构件，并将隔离构件附接于第一侧板的步骤包括：提供基板，并在基板的表面涂覆粘接剂；将基板伸入壳体内，并使粘接剂粘接于第一侧板、基板覆盖焊接部的至少部分。粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
相较于在壳体内涂覆粘结剂，上述方案在基板上涂覆粘结剂的工艺更为简单。
第五方面，本申请实施例提供了一种电池单体的制造系统，包括第一提供装置、第二提供装置、第三提供装置和第四提供装置。第一提供装置用于提供壳体，壳体沿第一方向的端部具有开口，壳体包括第一侧板，第一侧板包括沿第二方向布置的第一板体和第二板体，第一板体和第二板体焊接并形成焊接部，焊接部延伸至开口处，第二方向垂直于第一方向。第二提供装置用于提供隔离构件，并将隔离构件附接于第一侧板，以使隔离构件覆盖焊接部的至少部分。第三提供装置用于提供电极组件，并将电极组件安装到壳体内。第四提供装置用于提供端盖，并将端盖盖合于壳体的开口。隔离构件设置于第一侧板和电极组件之间，并将电极组件和焊接部隔开。
在一些实施方式中，第二提供装置包括：第一涂胶机构，用于在第一侧板上涂覆粘接剂；第一组装机构，用于提供基板，将基板伸入壳体内并粘接于粘接剂，以使基板覆盖焊接部的至少部分。粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
在另一些实施方式中，第二提供装置包括：第二涂胶机构，用于提供基板，并在基板的表面涂覆粘接剂；第二组装机构，用于将基板伸入壳体内，并使粘接剂粘接于第一侧板、基板覆盖焊接部的至少部分。粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
上述方案中，第二涂胶机构直接在基板上涂覆粘结剂，无需伸入到壳体内，这样可以简化涂胶工艺，提高电池单体的组装效率。
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为本申请一些实施例提供的车辆的结构示意图；
图2为本申请一些实施例提供的电池的爆炸示意图；
图3为本申请一些实施例提供的电池单体的立体结构示意图；
图4为图3所示的电池单体的爆炸示意图；
图5为图3所示的电池单体的剖视示意图；
图6为图5所示的电池单体在圆框A处的放大示意图；
图7为图3所示的电池单体的另一剖视示意图；
图8为图7所示的电池单体在圆框B处的放大示意图；
图9为本申请另一些实施例提供的电池单体的局部剖视示意图；
图10为本申请又一些实施例提供的电池单体的局部剖视示意图；
图11为图5所示的电池单体在圆框C处的放大示意图；
图12为本申请一些实施例提供的电池单体的电极组件的结构示意图；
图13为本申请另一些实施例提供的电池单体的电极组件的结构示意图；
图14为本申请一些实施例提供的电池单体的制造方法的流程示意图；
图15为本申请一些实施例提供的电池单体的制造系统的示意性框图；
图16为本申请另一些实施例提供的电池单体的制造系统的示意性框图。
在附图中，附图并未按照实际的比例绘制。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。
在本申请的描述中，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”、“附接”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，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中术语“平行”不仅包括绝对平行的情况，也包括了工程上常规认知的大致平行的情况；同时，“垂直”也不仅包括绝对垂直的情况，还包括工程上常规认知的大致垂直的情况。
本申请中，电池单体可以包括锂离子二次电池单体、锂离子一次电池单体、锂硫电池单体、钠锂离子电池单体、钠离子电池单体或镁离子电池单体等，本申请实施例对此并不限定。
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是电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。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。
电池单体包括电极组件和电解液，电极组件包括正极极片、负极极片和隔离膜。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面；正极集流体包括正极集流部和正极极耳，正极集流部涂覆有正极活性物质层，正极极耳未涂覆正极活性物质层。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质层包括正极活性物质，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面；负极集流体包括负极集流部和负极极耳，负极集流部涂覆有负极活性物质层，负极极耳未涂覆负极活性物质层。负极集流体的材料可以为铜，负极活性物质层包括负极活性物质，负极活性物质可以为碳或硅等。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
电池单体还包括壳体和端盖，壳体具有开口，端盖盖合于开口并密封连接，以形成用于容纳电极组件和电解液的密封空间。
壳体为中空结构，其可通过冲压板材、卷制板材、焊接板材等方式制成。示例性地，一些种类的壳体通过卷制板材而成，这类壳体需要在卷制的板材的接口处进行焊接，而焊接会在壳体上形成焊接部(例如焊缝)。焊接部的表面凹凸不平，在电池单体震动时，电极组件可能会挤压焊接部，造成电极组件的隔离膜被焊接部刺破，从而引发短路，造成安全风险。当然，其它种类的需要使用焊接工艺成型的壳体也存在上述的问题。
鉴于此，本申请实施例中提供了一种技术方案，通过在电池单体的内部设置隔离构件，以覆盖焊接部的至少部分并将电极组件和焊接部隔开，从而降低电极组件被焊接部刺破的风险，提高安全性。
本申请实施例描述的技术方案适用于电池以及使用电池的用电装置。
用电装置可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；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等等。本申请实施例对上述用电装置不做特殊限制。
以下实施例为了方便说明，以用电装置为车辆为例进行说明。
图1为本申请一些实施例提供的车辆的结构示意图。
如图1所示，车辆1的内部设置有电池2，电池2可以设置在车辆1的底部或头部或尾部。电池2可以用于车辆1的供电，例如，电池2可以作为车辆1的操作电源。
车辆1还可以包括控制器3和马达4，控制器3用来控制电池2为马达4供电，例如，用于车辆1的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池2不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，代替或部分地代替燃油或天然气为车辆1提供驱动动力。
图2为本申请一些实施例提供的电池的爆炸示意图。
如图2所示，电池2包括箱体5和电池单体6，电池单体6容纳于箱体5内。
箱体5用于容纳电池单体6，箱体5可以是多种结构。在一些实施例中，箱体5可以包括第一箱体部5a和第二箱体部5b，第一箱体部5a与第二箱体部5b相互盖合，第一箱体部5a和第二箱体部5b共同限定出用于容纳电池单体6的容纳空间。第二箱体部5b可以是一端开口的空心结构，第一箱体部5a为板状结构，第一箱体部5a盖合于第二箱体部5b的开口侧，以形成具有容纳空间的箱体5；第一箱体部5a和第二箱体部5b也均可以是一侧开口的空心结构，第一箱体部5a的开口侧盖合于第二箱体部5b的开口侧，以形成具有容纳空间的箱体5。当然，第一箱体部5a和第二箱体部5b可以是多种形状，比如，圆柱体、长方体等。
为提高第一箱体部5a与第二箱体部5b连接后的密封性，第一箱体部5a与第二箱体部5b之间也可以设置密封件，比如，密封胶、密封圈等。
假设第一箱体部5a盖合于第二箱体部5b的顶部，第一箱体部5a亦可称之为上箱盖，第二箱体部5b亦可称之为下箱体。
在电池2中，电池单体6可以是一个，也可以是多个。若电池单体6为多个，多个电池单体6之间可串联或并联或混联，混联是指多个电池单体6中既有串联又有并联。
多个电池单体6之间可直接串联或并联或混联在一起，再将多个电池单体6构成的整体容纳于箱体5内；当然，也可以是多个电池单体6先串联或并联或混联组成电池模块，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体5内。
在一些实施例中，电池单体6构成的整体直接安装于箱体5。这样可以省去将多个电池单体6组成电池模块的工艺，并省去电池模块中的用于固定电池单体6的固定框架，这样可以简化电池的结构，提高电池的能量密度。
图3为本申请一些实施例提供的电池单体的立体结构示意图；图4为图3所示的电池单体的爆炸示意图；图5为图3所示的电池单体的剖视示意图；图6为图5所示 的电池单体在圆框A处的放大示意图。
如图3至图6所示，本申请实施例的电池单体6包括电极组件10、壳体20、端盖30和隔离构件40。壳体20沿第一方向X的端部具有开口，壳体20包括第一侧板21，第一侧板21包括沿第二方向Y布置的第一板体211和第二板体212，第一板体211和第二板体212焊接并形成焊接部213，焊接部213延伸至开口处，第二方向Y垂直于第一方向X。电极组件10容纳于壳体20内。端盖30用于盖合于开口。隔离构件40设置于第一侧板21和电极组件10之间，且隔离构件40附接于第一侧板21并覆盖焊接部213的至少部分，以将电极组件10和焊接部213隔开。
壳体20为空心结构，其内部形成用于容纳电极组件10和电解液的容纳腔。壳体20可以是多种形状，比如，圆柱体、长方体等。壳体20的形状可根据电极组件10的具体形状来确定。比如，若电极组件10为圆柱体结构，则可选用为圆柱体壳体；若电极组件10为长方体结构，则可选用长方体壳体。
端盖30与壳体20密封连接，以形成用于容纳电极组件10和电解液的密封空间。示例性地，端盖30通过焊接、粘接、卡接或其它方式连接于壳体20。
在一些示例中，壳体20沿第一方向X的一端具有开口，端盖30设置为一个并盖合于壳体20的开口。在另一些示例中，壳体20沿第一方向X的两端均具有开口，端盖30设置为两个，两个端盖30分别盖合于壳体20的两个开口。
壳体20可由一个板材通过弯折、焊接等工艺制成，也可由多个板材焊接而成。
示例性地，第一板体211和第二板体212均大体为平板结构，且第一板体211和第二板体212均平行于第一方向X。
焊接部213为条形结构，其两端分别延伸至第一板体211沿第一方向X的两个边缘。焊接部213的延伸方向可以平行于第一方向X，也可以与第一方向X相交。
在一些示例中，第一板体211和第二板体212沿第二方向Y对接，激光作用在第一板体211和第二板体212之间的对接处，以焊接第一板体211和第二板体212并形成焊接部213。在另一些示例中，第一板体211和第二板体212在第三方向Z上部分地重叠，激光作用在第一板体211和第二板体212之间的重叠区，以焊接第一板体211和第二板体212并形成焊接部213。示例性地，第一方向X、第二方向Y和第三方向Z两两垂直。
电极组件10为电池单体6实现充放电功能的核心部件，其包括第一极片、第二极片和隔离膜，第一极片和第二极片的极性相反，隔离膜用于将第一极片和第二极片绝缘隔离。电极组件10主要依靠金属离子在第一极片和第二极片之间移动来工作。
第一极片和第二极片中的一者为正极极片，第一极片和第二极片中的另一者为负极极片。
电极组件10可以为卷绕式结构、叠片式结构或其它结构。第一极片可以为一个或多个，第二极片可以为一个或多个。第一极片和第二极片的数量可根据电极组件10的结构确定。
电极组件10可以为一个，也可以为多个，本实施例对此不作限制。
在第一侧板21上附接隔离构件40是指通过粘附、涂覆、喷涂或其它方式在第 一侧板21上形成隔离构件40。通过附接，可以将隔离构件40和第一侧板21相连，减小或避免隔离构件40相对于第一侧板21的移动。
隔离构件40可以附接到第一板体211、第二板体212和焊接部213中的至少一者。
隔离构件40可以完全覆盖焊接部213，也可以仅覆盖焊接部213的一部分。本实施例的覆盖是指从内侧覆盖。
在一些示例中，隔离构件40在第三方向Z上将电极组件10和第一侧板21隔开。可选地，在第三方向Z上，隔离构件40整体位于第一侧板21和电极组件10之间。
本申请实施例通过焊接工艺来制备壳体20。相对于传统的通过冲压工艺制备的壳体，本申请实施例的壳体20在第一方向X上可以具有更大的尺寸，从而增大电池单体6的容量。
在本实施例中，隔离构件40能够将电极组件10和焊接部213隔开，从而降低电极组件10被焊接部213刺破的风险，提高安全性。由于隔离构件40覆盖焊接部213的至少部分，所以隔离构件40能够遮挡焊接部213上残留的颗粒，降低因颗粒掉落到电极组件10内而引发短路的风险，提高安全性。
在一些实施例中，电池单体6还包括安装于端盖30的两个电极端子50，两个电极端子50分别用于与第一极片和第二极片电连接，以将电极组件10产生的电能导出。
在一些实施例中，壳体20为两侧开口的结构，端盖30设置为两个，两个端盖30分别盖合于壳体20的两个开口。可选地，两个电极端子50分别安装于两个端盖30。
在一些实施例中，电池单体6还包括绝缘片60，绝缘片60包裹在电极组件10的外侧并用于将电极组件10和壳体20绝缘隔离。绝缘片60的厚度小于隔离构件40的厚度。
在一些实施例中，壳体20沿第一方向X的尺寸为100mm-2000mm。
示例性地，壳体20沿第一方向X的尺寸为100mm、150mm、400mm、600mm、1000mm、1200mm、1500mm或2000mm。
示例性地，第一方向X平行于电池单体6的长度方向。
在本实施例中，电池单体6的沿第一方向X的尺寸足够长，能够与箱体的尺寸相匹配，多个电池单体6可以直接并列布置在箱体内，无需先将电池单体6组装成电池模块，这样可以省去电池模块中的用于固定电池单体6的框架结构，从而节省了电池的内部空间，提高了电池的空间利用率和能量密度，简化电池单体6的组装工艺，降低成本。
在本实施例中，壳体20沿第一方向X的尺寸较大，如果采用冲压工艺制造，那么可能很容易破裂；本实施例通过焊接工艺来制备大尺寸的壳体20，从而保证壳体20的强度。
在一些实施例中，壳体20沿第一方向X的两端均形成开口，且壳体20为通过弯折平板形成的筒状结构，筒状结构的接口处焊接并形成焊接部213。本实施例可以简化壳体20的成型工艺，并保证壳体20的强度。
在另一些实施例中，壳体20沿第一方向X的两端均形成开口，壳体20为通过两个U形的板材对接而成的筒状结构，筒状结构的两个接口处焊接并形成焊接部213。
在一些实施例中，隔离构件40包括基板41和粘接层42，基板41覆盖焊接部213的至少部分，粘接层42位于基板41和第一侧板21之间并粘接基板41和第一侧板21。
粘接层42粘接于第一板体211、第二板体212以及焊接部213中的至少一者，以将基板41连接到第一侧板21。示例性地，粘接层42同时粘接于第一板体211、第二板体212以及焊接部213。
基板41覆盖焊接部213的至少部分指的是：基板41在第三方向Z上的投影与焊接部213在第三方向Z上的投影至少部分地重叠。
基板41可以仅覆盖焊接部213一部分，也可以完全覆盖焊接部213。
在本实施例中，粘接层42可以保证基板41和第一侧板21之间的连接强度，并简化隔离构件40和第一侧板21的装配工艺。
在一些实施例中，在装配壳体20和隔离构件40时，可先在第一侧板21上涂覆粘接剂，然后将基板41伸入壳体20内并粘接于粘接剂；粘接剂固化后形成粘接层42，粘接层42和基板41形成隔离构件40。在另一些实施例中，在装配壳体20和隔离构件40时，可先在基板41的表面涂覆粘接剂，然后将涂覆有粘接剂的基板41伸入壳体20内，并使粘接剂粘接于第一侧板21；粘接剂固化后形成粘接层42，粘接层42和基板41形成隔离构件40。
在一些实施例中，粘接层42的至少部分粘接于焊接部213。
在本实施例中，粘接层42具有粘性，其能够粘合于焊接部213表面残留的颗粒，以固定颗粒，降低因颗粒掉入电极组件10内而引发短路的风险，提高安全性。
在一些实施例中，基板41的硬度大于粘接层42的硬度。
在本实施例中，基板41具有较大的硬度，其相对于粘接层42更不易被焊接部213刺破，这样，基板41可以有效地将焊接部213和电极组件10隔开，降低短路风险，提高安全性。
在一些实施例中，基板41的厚度大于粘接层42的厚度。
本实施例可以在隔离构件40的厚度一定的情况下，节省粘接层42的用量，并降低基板41被焊接部213刺穿的风险。
在一些实施例中，在电池的至少一个电池单体6中，第一侧板21设置于电极组件10沿竖直方向的下侧。
由于第一侧板21位于电极组件10的下侧，所以在电极组件10的重力的作用下，电极组件10会挤压第一侧板21。如果不设置隔离构件40，电极组件10容易在重力作用下挤压焊接部213，从而被焊接部213刺破并引发短路风险。本申请实施例通过设置隔离构件40，以将电极组件10和第一侧板21隔开，从而降低电极组件10被焊接部213刺破的风险，提高安全性。
图7为图3所示的电池单体的另一剖视示意图；图8为图7所示的电池单体在圆框B处的放大示意图。
如图7和图8所示，在一些实施例中，电池单体6还包括绝缘构件70，绝缘构件70设置于端盖30面向电极组件10的一侧，并用于将端盖30和电极组件10绝缘隔离。绝缘构件70和基板41沿第一方向X间隔设置。
绝缘构件70用于将端盖30和电极组件10绝缘隔离，以降低短路风险。绝缘构件70的材质可为塑胶，示例性地，绝缘构件70的材质为聚丙烯。
绝缘构件70在第三方向Z上的投影与基板41在第三方向Z上的投影不重叠。
本实施例将绝缘构件70和基板41沿第一方向X间隔设置，以在绝缘构件70伸入壳体20的过程中降低绝缘构件70与基板41干涉的风险，避免基板41受到绝缘构件70的挤压，保证基板41固定在第一侧板21上。
在一些实施例中，绝缘构件70抵压于电极组件10的面向端盖30的端面，以在第一方向X上限制电极组件10，减小电极组件10在电池单体6震动时的晃动幅度，提高安全性。
在一些实施例中，电池单体6还包括粘接构件80，粘接构件80的至少部分位于第一侧板21和绝缘构件70之间，并粘接于焊接部未被隔离构件40覆盖的部分。
粘接构件80可以仅粘接于焊接部，也可同时粘接于焊接部、第一板体和第二板体。
粘接构件80可以为独立的构件，例如，粘接构件80可为胶带或胶纸。可替代地，粘接构件80也可与粘接层42一体形成。
在本实施例中，粘接构件80能够粘合于焊接部表面残留的颗粒，以降低因颗粒掉入电极组件10内而引发短路的风险；粘接构件80还能够将绝缘构件70和焊接部隔开，降低绝缘构件70被焊接部划伤的风险，提高安全性。
在一些实施例中，粘接构件80的厚度小于隔离构件40的厚度。
在本实施例中，粘接构件80具有较小的厚度，这样可以在绝缘构件70伸入壳体20的过程中降低绝缘构件70挤压粘接构件80的风险，减小粘接构件80脱落的可能性，进而保证安全性能。
在一些实施例中，粘接构件80和粘接层42为一体形成结构。
示例性地，在电池单体6的装配过程中，可先在第一侧板21上涂覆粘接剂，且粘结剂沿第一方向X涂覆的尺寸大于基板41沿第一方向X的尺寸，然后将基板41伸入壳体20内并粘接于粘接剂。粘接剂的与基板41重叠的部分在固化后形成粘接层42，粘接剂的不与基板41重叠的部分在固化后形成粘接构件80。
本实施例能够简化粘接构件80和粘接层42的成型工艺，提高电池单体6的装配效率。
在一些实施例中，粘接构件80的厚度等于粘接层42的厚度。
在一些实施例中，端盖30的至少部分经由开口伸入壳体20并焊接于壳体20。焊接部的靠近开口的端部需要与端盖30焊接，为避免粘接构件80与端盖30干涉，粘接构件80与端盖30在第一方向X上间隔设置。
焊接部的需要与端盖30焊接的部分可通过打磨的方式磨平，从而保证端盖30和壳体20之间的连接强度和密封性。
图9为本申请另一些实施例提供的电池单体的局部剖视示意图。
如图9所示，在一些实施例中，粘接构件80包括连续设置的第一粘接部81和第二粘接部82，第一粘接部81和隔离构件40沿第一方向X布置并用于与焊接部粘接，第二粘接部82的至少部分粘接于基板41面向电极组件10的表面。
在本实施例中，第一粘接部81能够粘接于焊接部未被隔离构件40覆盖的部分，从而固定焊接部表面残留的颗粒，以降低因颗粒掉入电极组件10内而引发短路的风险。由于第一粘接部81与第一侧板21相连而第二粘接部82与基板41相连，所以粘接构件80还能够将基板41固定到第一侧板21，提高第一侧板21和基板41的连接强度，降低基板41脱落的风险。
示例性地，粘接构件80为胶带或胶纸。
在另一些实施例中，粘接构件也可整体位于隔离构件沿第一方向的一侧并连接于隔离构件的靠近端盖的端部。
图10为本申请又一些实施例提供的电池单体的局部剖视示意图。
如图10所示，在一些实施例中，隔离构件40的面向第一侧板21的表面设有凹部43，凹部43用于容纳焊接部213的至少部分。
在本实施例中，凹部43能够为焊接部213提供容纳空间，以减小焊接部213与隔离构件40之间的接触面积以及压力，从而降低隔离构件40被焊接部213刺破的风险。
在一些实施例中，粘接层42为环状结构，其中部形成凹部43。环状的粘接层42能够将焊接部213上残留的部分颗粒封闭在凹部43内，从而降低颗粒掉入电极组件10内的风险。
在一些实施例中，隔离构件40的背离第一侧板21的表面设有开孔44，开孔44与焊接部213错开设置。
开孔44从隔离构件40的背离第一侧板21的表面沿面向第一侧板21的方向延伸。开孔44可以是盲孔，也可以是通孔。开孔44可以是一个，也可以是多个。
在第一侧板21的厚度方向上，开孔44的投影和焊接部213的投影不重叠。
本实施例通过设置开孔44，可以降低隔离构件40的重量，并为电解液提供更多的容纳空间，以改善电池单体6的性能。本实施例将开孔44与焊接部213错开设置，以降低焊接部213经由开孔44穿过隔离构件40的风险，提高安全性。
图11为图5所示的电池单体在圆框C处的放大示意图。
如图11所示，在一些实施例中，壳体20还包括沿第二方向Y布置的两个第二侧板22，一个第二侧板22通过一个过渡板23连接于第一板体，另一个第二侧板22通过另一个过渡板23连接于第二板体。过渡板23的内表面为圆弧面，隔离构件40支撑电极组件10，以使电极组件10的极片与圆弧面之间的最小间距大于预设值。
示例性地，第一板体垂直于前述一个第二侧板22，第二板体垂直于前述另一个第二侧板22。可选地，第一板体、前述一个第二侧板22、前述一个过渡板23为一体形成结构，第二板体、前述另一个第二侧板22和前述另一个过渡板23为一体形成结构。
过渡板23为壳体20在成型过程中形成的圆角。本实施例通过设置过渡板23， 可以去除壳体20的尖角，减小应力集中，提高壳体20的强度。第一板体的内表面与对应的过渡板23的内表面相切，第二板体与对应的过渡板23的内表面相切。
预定值根据设计需求的不同而不同。该预定值可能需要综合考虑壳体20的形状尺寸和电极组件10的形状尺寸。示例性地，该预定值为0.1mm-5mm。
发明人发现，当第一侧板21位于电极组件10沿竖直方向的下侧时，电极组件10在重力的作用下可能会挤压过渡板23的内表面，而由于过渡板23的内表面为圆弧面，所以在震动冲击的工况下，过渡板23的内表面容易挤压电极组件10的极片，从而导致极片的活性物质脱落，引发安全隐患。本实施例的隔离构件40能够支撑电极组件10，使电极组件10的极片与圆弧面之间的最小间距大于预设值，进而减小传递到极片的端部的作用力，降低极片的活性物质脱落的风险，提高安全性。
在一些实施例中，圆弧面的半径为R，隔离构件40的厚度为T，T和R满足：0.5R≤T≤2R。
T/R的值越小，极片与圆弧面的距离越小，极片在电池单体6震动时受压越大；T/R的值越大，隔离构件40占用的空间越大，壳体20内部的空间利用率越低，电池单体6的能量密度也就越低。发明人经过试验，将T/R的值限定在0.5-2，以平衡电池单体6的安全性和能量密度。
在一些实施例中，第一侧板21和第二侧板22大体为矩形平板。
在一些实施例中，第二侧板22的面积大于第一侧板21的面积。示例性地，第二侧板22沿第一方向的尺寸等于第一侧板21沿第一方向的尺寸。
在一些实施例中，壳体大体为中空的长方体。具体地，壳体还包括第三侧板，第三侧板和第一侧板21沿第三方向Z相对设置。第三侧板沿第二方向Y的两端分别通过两个过渡板23连接于两个第二侧板22。
在一些实施例中，电池单体6沿第一方向的尺寸大于电池单体6沿第二方向Y的尺寸和电池单体6沿第三方向Z的尺寸。车辆为电池在竖直方向上预留的空间有限，因此，为了减小电池在竖直方向上的高度，可以使第一方向平行于水平方向，这样能够减小电池在竖直方向上的最大尺寸。
在一些实施例中，电池单体6沿第三方向Z的尺寸大于电池单体6沿第二方向Y的尺寸。可选地，在电池中，可以使电池单体6侧向放置；在电池单体6侧向放置时，第三方向Z平行于竖直方向。
图12为本申请一些实施例提供的电池单体的电极组件的结构示意图。
如图11和图12所示，在一些实施例中，电极组件10包括多个第一极片11和多个第二极片12，多个第一极片11和多个第二极片12沿第二方向Y交替层叠，第一极片11和第二极片12的极性相反。
第二方向Y平行于第一极片11的厚度方向和第二极片12的厚度方向。示例性地，第一极片11和第二极片12均为矩形的平板且彼此平行设置。
在充电的过程中，电极组件10会出现膨胀。具体地，第一极片11和第二极片12在自身厚度方向上的膨胀最大，因此，电极组件10在第二方向Y上的膨胀要大于电极组件10在第三方向Z上的膨胀，电极组件10与第一侧板21之间的挤压力小于电极 组件10与第二侧板22之间的挤压力。
本申请实施例在制备壳体时，在第一侧板21上形成焊接部；相较于在第二侧板22上形成焊接部的方案，本实施例能够减小电极组件10在膨胀时对隔离构件40施加的作用力，从而降低电极组件10和隔离构件40被焊接部刺破的风险，提高安全性。
电极组件10大体为长方体结构，其面向第一侧板21的表面近似为平面，所以电极组件10与第一侧板21之间的空间较小，电极组件10在重力的作用下可能会挤压过渡板23的内表面。本实施例的隔离构件40能够支撑电极组件10，以增大电极组件10与第一侧板21之间的空间，减小极片与圆弧面之间的作用力，降低极片的活性物质脱落的风险，提高安全性。
在一些实施例中，电极组件10还包括隔离膜13，隔离膜13用于将第一极片11和第二极片12绝缘隔离。
图13为本申请另一些实施例提供的电池单体的电极组件的结构示意图。
如图11和图13所示，在一些实施例中，电极组件10包括第一极片11和多个第二极片12，第一极片11连续弯折且包括多个层叠段111和多个折弯段112，多个层叠段111和多个第二极片12沿第二方向Y交替层叠，各折弯段112用于连接相邻的两个层叠段111。
第二方向Y平行于层叠段111的厚度方向和第二极片12的厚度方向。示例性地，层叠段111和第二极片12均为矩形的平板且彼此平行设置。
在充电的过程中，电极组件10会出现膨胀。具体地，第一极片11和第二极片12在自身厚度方向上的膨胀最大，因此，电极组件10在第二方向Y上的膨胀要大于电极组件10在第三方向Z上的膨胀，电极组件10与第一侧板21之间的挤压力小于电极组件10与第二侧板22之间的挤压力。
本申请实施例在制备壳体时，在第一侧板21上形成焊接部；相较于在第二侧板22上形成焊接部的方案，本实施例能够减小电极组件10在膨胀时对隔离构件40施加的作用力，从而降低电极组件10和隔离构件40被焊接部刺破的风险，提高安全性。
电极组件10大体为长方体结构，其面向第一侧板21的表面近似为平面，所以电极组件10与第一侧板21之间的空间较小，电极组件10在重力的作用下可能会挤压过渡板23的内表面。本实施例的隔离构件40能够支撑电极组件10，以增大电极组件10与第一侧板21之间的空间，减小极片与圆弧面之间的作用力，降低极片的活性物质脱落的风险，提高安全性。
图14为本申请一些实施例提供的电池单体的制造方法的流程示意图。
如图14所示，本申请实施例的电池单体的制造方法包括：
S100、提供壳体，壳体沿第一方向的端部具有开口，壳体包括第一侧板，第一侧板包括沿第二方向布置的第一板体和第二板体，第一板体和第二板体焊接并形成焊接部，焊接部延伸至开口处，第二方向垂直于第一方向；
S200、提供隔离构件，并将隔离构件附接于第一侧板，以使隔离构件覆盖焊接部的至少部分；
S300、提供电极组件，并将电极组件安装到壳体内；
S400、提供端盖，并将端盖盖合于壳体的开口；
其中，隔离构件设置于第一侧板和电极组件之间，并将电极组件和焊接部隔开。
在一些实施例中，步骤S200包括：
步骤S210、在第一侧板上涂覆粘接剂；
步骤S220、提供基板，将基板伸入壳体内并粘接于粘接剂，以使基板覆盖焊接部的至少部分。
粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
在另一些实施例中，步骤S200包括：
步骤S230、提供基板，并在基板的表面涂覆粘接剂；
步骤S240、将基板伸入壳体内，并使粘接剂粘接于第一侧板、基板覆盖焊接部的至少部分。
粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
相较于在壳体内涂覆粘结剂，本实施例的在基板上涂覆粘结剂的工艺更为简单。
需要说明的是，通过上述电池单体的制造方法制造出的电池单体的相关结构，可参见上述各实施例提供的电池单体。
图15为本申请一些实施例提供的电池单体的制造系统的示意性框图；图16为本申请另一些实施例提供的电池单体的制造系统的示意性框图。
如图15和图16所示，本申请实施例的电池单体的制造系统90包括第一提供装置91、第二提供装置92、第三提供装置93和第四提供装置94。第一提供装置91用于提供壳体，壳体沿第一方向的端部具有开口，壳体包括第一侧板，第一侧板包括沿第二方向布置的第一板体和第二板体，第一板体和第二板体焊接并形成焊接部，焊接部延伸至开口处，第二方向垂直于第一方向。第二提供装置92用于提供隔离构件，并将隔离构件附接于第一侧板，以使隔离构件覆盖焊接部的至少部分。第三提供装置93用于提供电极组件，并将电极组件安装到壳体内。第四提供装置94用于提供端盖，并将端盖盖合于壳体的开口。隔离构件设置于第一侧板和电极组件之间，并将电极组件和焊接部隔开。
如图15所示，在一些实施例中，第二提供装置92包括第一涂胶机构921和第一组装机构922。第一涂胶机构921用于在第一侧板上涂覆粘接剂。第一组装机构922用于提供基板，将基板伸入壳体内并粘接于粘接剂，以使基板覆盖焊接部的至少部分。粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
如图16所示，在另一些实施例中，第二提供装置92包括第二涂胶机构923和第二组装机构924。第二涂胶机构923用于提供基板，并在基板的表面涂覆粘接剂。第二组装机构924用于将基板伸入壳体内，并使粘接剂粘接于第一侧板、基板覆盖焊接部的至少部分。粘接剂固化后形成粘接层，粘接层和基板形成隔离构件。
在本实施例中，第二涂胶机构923直接在基板上涂覆粘结剂，无需伸入到壳体内，这样可以简化涂胶工艺，提高电池单体的组装效率。
通过上述制造系统制造出的电池单体的相关结构，可参见上述各实施例提供的电池单体。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换，但这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (25)

  1. 一种电池单体，包括：
    壳体，沿第一方向的端部具有开口，所述壳体包括第一侧板，所述第一侧板包括沿第二方向布置的第一板体和第二板体，所述第一板体和所述第二板体焊接并形成焊接部，所述焊接部延伸至所述开口处，所述第二方向垂直于所述第一方向；
    电极组件，容纳于所述壳体内；
    端盖，用于盖合于所述开口；以及
    隔离构件，设置于所述第一侧板和所述电极组件之间，且所述隔离构件附接于所述第一侧板并覆盖所述焊接部的至少部分，以将所述电极组件和所述焊接部隔开。
  2. 根据权利要求1所述的电池单体，其中，所述隔离构件包括基板和粘接层，所述基板覆盖所述焊接部的至少部分，所述粘接层位于所述基板和所述第一侧板之间并粘接所述基板和所述第一侧板。
  3. 根据权利要求2所述的电池单体，其中，所述粘接层的至少部分粘接于所述所述焊接部。
  4. 根据权利要求2或3所述的电池单体，其中，所述基板的硬度大于所述粘接层的硬度。
  5. 根据权利要求2-4任一项所述的电池单体，还包括绝缘构件，所述绝缘构件设置于所述端盖面向所述电极组件的一侧，并用于将所述端盖和所述电极组件绝缘隔离；
    所述绝缘构件和所述基板沿所述第一方向间隔设置。
  6. 根据权利要求5所述的电池单体，还包括粘接构件，所述粘接构件的至少部分位于所述第一侧板和所述绝缘构件之间，并粘接于所述焊接部未被所述所述隔离构件覆盖的部分。
  7. 根据权利要求6所述的电池单体，其中，所述粘接构件的厚度小于所述隔离构件的厚度。
  8. 根据权利要求6或7所述的电池单体，其中，所述粘接构件包括连续设置的第一粘接部和第二粘接部，所述第一粘接部和所述隔离构件沿所述第一方向布置并用于与所述焊接部粘接，所述第二粘接部的至少部分粘接于所述基板面向所述电极组件的表面。
  9. 根据权利要求6或7所述的电池单体，其中，所述粘接构件和所述粘接层为一体形成结构。
  10. 根据权利要求1-9任一项所述的电池单体，其中，所述隔离构件的面向所述第一侧板的表面设有凹部，所述凹部用于容纳所述焊接部的至少部分。
  11. 根据权利要求1-10任一项所述的电池单体，其中，所述隔离构件的背离所述第一侧板的表面设有开孔，所述开孔与所述焊接部错开设置。
  12. 根据权利要求1-11任一项所述的电池单体，其中，所述壳体沿所述第一方向的两端均形成开口，且所述壳体为通过弯折平板形成的筒状结构，所述筒状结构的接口 处焊接并形成所述焊接部。
  13. 根据权利要求1-12任一项所述的电池单体，其中，所述壳体还包括沿所述第二方向布置的两个第二侧板，一个所述第二侧板通过一个过渡板连接于所述第一板体，另一个所述第二侧板通过另一个所述过渡板连接于所述第二板体；
    所述过渡板的内表面为圆弧面，所述隔离构件支撑所述电极组件，以使所述电极组件的极片与所述圆弧面之间的最小间距大于预设值。
  14. 根据权利要求13所述的电池单体，其中，所述第二侧板的面积大于所述第一侧板的面积。
  15. 根据权利要求1-14任一项所述的电池单体，其中，所述壳体沿所述第一方向的尺寸为100mm-2000mm。
  16. 根据权利要求1-15任一项所述的电池单体，其中，
    所述电极组件包括多个第一极片和多个第二极片，多个所述第一极片和多个所述第二极片沿所述第二方向交替层叠，所述第一极片和所述第二极片的极性相反；或者
    所述电极组件包括第一极片和多个第二极片，所述第一极片连续弯折且包括多个层叠段和多个折弯段，多个所述层叠段和多个所述第二极片沿所述第二方向交替层叠，各所述折弯段用于连接相邻的两个所述层叠段。
  17. 一种电池，包括多个根据权利要求1-16中任一项所述的电池单体。
  18. 根据权利要求17所述的电池，其中，在至少一个所述电池单体中，所述第一侧板设置于所述电极组件沿竖直方向的下侧。
  19. 一种用电装置，包括根据权利要求17或18所述的电池，所述电池用于提供电能。
  20. 一种电池单体的制造方法，包括：
    提供壳体，所述壳体沿第一方向的端部具有开口，所述壳体包括第一侧板，所述第一侧板包括沿第二方向布置的第一板体和第二板体，所述第一板体和所述第二板体焊接并形成焊接部，所述焊接部延伸至所述开口处，所述第二方向垂直于所述第一方向；
    提供隔离构件，并将所述隔离构件附接于所述第一侧板，以使所述隔离构件覆盖所述焊接部的至少部分；
    提供电极组件，并将所述电极组件安装到所述壳体内；
    提供端盖，并将所述端盖盖合于所述壳体的开口；
    其中，所述隔离构件设置于所述第一侧板和所述电极组件之间，并将所述电极组件和所述焊接部隔开。
  21. 根据权利要求20所述的制造方法，其中，所述提供隔离构件，并将所述隔离构件附接于所述第一侧板的步骤包括：
    在所述第一侧板上涂覆粘接剂；
    提供基板，将所述基板伸入所述壳体内并粘接于所述粘接剂，以使所述基板覆盖所述焊接部的至少部分；
    其中，所述粘接剂固化后形成粘接层，所述粘接层和所述基板形成所述隔离构件。
  22. 根据权利要求20所述的制造方法，其中，所述提供隔离构件，并将所述隔离构件附接于所述第一侧板的步骤包括：
    提供基板，并在所述基板的表面涂覆粘接剂；
    将所述基板伸入所述壳体内，并使所述粘接剂粘接于所述第一侧板、所述基板覆盖所述焊接部的至少部分；
    其中，所述粘接剂固化后形成粘接层，所述粘接层和所述基板形成所述隔离构件。
  23. 一种电池单体的制造系统，包括：
    第一提供装置，用于提供壳体，所述壳体沿第一方向的端部具有开口，所述壳体包括第一侧板，所述第一侧板包括沿第二方向布置的第一板体和第二板体，所述第一板体和所述第二板体焊接并形成焊接部，所述焊接部延伸至所述开口处，所述第二方向垂直于所述第一方向；
    第二提供装置，用于提供隔离构件，并将所述隔离构件附接于所述第一侧板，以使所述隔离构件覆盖所述焊接部的至少部分；
    第三提供装置，用于提供电极组件，并将所述电极组件安装到所述壳体内；
    第四提供装置，用于提供端盖，并将所述端盖盖合于所述壳体的开口；
    其中，所述隔离构件设置于所述第一侧板和所述电极组件之间，并将所述电极组件和所述焊接部隔开。
  24. 根据权利要求23所述的制造系统，其中，所述第二提供装置包括：
    第一涂胶机构，用于在所述第一侧板上涂覆粘接剂；
    第一组装机构，用于提供基板，将所述基板伸入所述壳体内并粘接于所述粘接剂，以使所述基板覆盖所述焊接部的至少部分；
    其中，所述粘接剂固化后形成粘接层，所述粘接层和所述基板形成所述隔离构件。
  25. 根据权利要求23所述的制造系统，其中，所述第二提供装置包括：
    第二涂胶机构，用于提供基板，并在所述基板的表面涂覆粘接剂；
    第二组装机构，用于将所述基板伸入所述壳体内，并使所述粘接剂粘接于所述第一侧板、所述基板覆盖所述焊接部的至少部分；
    其中，所述粘接剂固化后形成粘接层，所述粘接层和所述基板形成所述隔离构件。
PCT/CN2022/070747 2022-01-07 2022-01-07 电池单体及其制造方法和制造系统、电池以及用电装置 WO2023130358A1 (zh)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1758474A (zh) * 2004-09-24 2006-04-12 三星Sdi株式会社 二次电池
US20110076533A1 (en) * 2009-09-28 2011-03-31 Samsung Sdi Co., Ltd. Secondary battery
CN111799402A (zh) * 2017-08-30 2020-10-20 宁德时代新能源科技股份有限公司 二次电池以及电池模组
CN112768813A (zh) * 2020-12-28 2021-05-07 中天储能科技有限公司 电池、电池壳体及电池壳体的制造方法
CN213692271U (zh) * 2020-11-20 2021-07-13 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
CN113363642A (zh) * 2021-05-31 2021-09-07 宁德新能源科技有限公司 电芯及用电装置

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Publication number Priority date Publication date Assignee Title
CN1758474A (zh) * 2004-09-24 2006-04-12 三星Sdi株式会社 二次电池
US20110076533A1 (en) * 2009-09-28 2011-03-31 Samsung Sdi Co., Ltd. Secondary battery
CN111799402A (zh) * 2017-08-30 2020-10-20 宁德时代新能源科技股份有限公司 二次电池以及电池模组
CN213692271U (zh) * 2020-11-20 2021-07-13 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
CN112768813A (zh) * 2020-12-28 2021-05-07 中天储能科技有限公司 电池、电池壳体及电池壳体的制造方法
CN113363642A (zh) * 2021-05-31 2021-09-07 宁德新能源科技有限公司 电芯及用电装置

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