WO2023050388A1 - 电池单体、电池、用电设备及电池单体的制造方法和设备 - Google Patents

电池单体、电池、用电设备及电池单体的制造方法和设备 Download PDF

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Publication number
WO2023050388A1
WO2023050388A1 PCT/CN2021/122378 CN2021122378W WO2023050388A1 WO 2023050388 A1 WO2023050388 A1 WO 2023050388A1 CN 2021122378 W CN2021122378 W CN 2021122378W WO 2023050388 A1 WO2023050388 A1 WO 2023050388A1
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WIPO (PCT)
Prior art keywords
tab
battery cell
connection part
segment
corner
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Application number
PCT/CN2021/122378
Other languages
English (en)
French (fr)
Inventor
林文法
余明喜
黄宁
Original Assignee
宁德时代新能源科技股份有限公司
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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 CN202180092103.3A priority Critical patent/CN116897464A/zh
Priority to PCT/CN2021/122378 priority patent/WO2023050388A1/zh
Priority to EP21958959.5A priority patent/EP4254641A4/en
Priority to KR1020237009133A priority patent/KR20230053657A/ko
Priority to JP2023515570A priority patent/JP2023547983A/ja
Priority to CN202222600275.1U priority patent/CN218997018U/zh
Priority to US18/189,013 priority patent/US20230261334A1/en
Publication of WO2023050388A1 publication Critical patent/WO2023050388A1/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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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, in particular to a battery cell, a battery, an electrical device, and a manufacturing method and device for the battery cell.
  • the purpose of the present application is to provide a battery cell, a battery, an electrical device, and a manufacturing method and device for the battery cell.
  • the battery cell has a relatively high energy density.
  • the present application provides a battery cell, which includes:
  • Electrode assembly including body and tabs
  • connection part includes a terminal connection part and a tab connection part, the terminal connection part is used for connecting the electrode terminal, the tab connection part is used for connecting the tab, and the tab connection part has a first surface;
  • the tab includes a first section connected to the body, a second section fixed to the first surface, and a corner section connected between the first section and the second section, along the The body points to the direction of the connection part, and the corner segment exceeds the first surface.
  • the corner section exceeds the first surface, and part of the tab is accommodated in the space where the first surface is away from the main body, thereby reducing the first surface occupied by the tab close to the main body.
  • the space on the side, thereby reducing the distance between the body and the connecting parts, makes each part more compact, thereby increasing the volumetric energy density.
  • the corner segment exceeds the second surface of the lug connection portion away from the body.
  • the corner section exceeds the second surface, and more parts of the tabs are accommodated in the space away from the body on the first surface, which can make the distance between the body and the connecting part smaller, and further increase the space ratio of the body. That is, increasing the proportion of positive and negative active materials increases the energy density of the battery cell.
  • the included angle between the corner segment and the second segment is an obtuse angle.
  • the arrangement of the corner section and the second section makes the interference force between the connecting part and the corner section small, which can reduce the damage of the connecting part to the tab, and facilitate the realization of tab bending.
  • the battery cell further includes: a housing with a housing cavity, at least part of the connecting part and the electrode assembly are accommodated in the housing cavity; the connecting part also has a The end surface in the thickness direction of the electrode assembly, the corner section is located between the end surface and the inner wall of the casing.
  • the corner section is arranged between the end surface and the inner wall of the casing, rationally utilizing the inner space of the containing cavity, reducing space occupation, and ensuring higher energy density of the battery cell.
  • the battery cell further includes: an end cover for sealing the casing; an insulator, at least part of which is disposed between the end cover and the connecting part for The end cap and the connection part are isolated.
  • the isolation between the end cap and the connection part is realized by the insulating member, so as to avoid internal short circuit and ensure the safety of the battery cell.
  • the edge of the insulator along the thickness direction of the electrode assembly is formed with a flange protruding toward the body, and the flange is located between the corner section and the casing. between.
  • the flange is located between the corner section and the casing, which can function to isolate the corner section and the casing, avoid internal short circuit, and ensure the safety of the battery cells.
  • the thickness of the tab is A, and the distance between the end surface and the flange is B, satisfying 1% ⁇ A/B ⁇ 20%.
  • the above numerical range can not only reduce the difficulty of bending the tab, but also facilitate the accommodation of the corner section.
  • the corner section abuts against a side of the insulating member away from the end cap.
  • the corner segment is in contact with the insulating member, which can further reduce the distance between the main body and the connecting part, so that the battery cell has a higher energy density.
  • a rounded corner or an elastic member is provided at the intersection of the first surface and the end surface.
  • the rounded corner or the elastic member provided at the intersection of the first surface and the end surface can buffer the friction between the tab and the connecting part, avoid cutting the tab, and ensure the service life of the battery cell.
  • the terminal connection portion protrudes toward a side away from the body relative to the tab connection portion.
  • the terminal connecting portion protrudes relative to the lug connecting portion, which is convenient for connecting with the electrode terminal, and avoids protruding toward the body to occupy the internal space of the battery cell, thereby ensuring the energy density of the battery cell.
  • the present application provides a battery, which includes the battery cell described in any one of the solutions above.
  • the present application provides an electric device, which includes the battery cell according to any one of the solutions above, and the battery cell is used to provide electric energy.
  • the present application provides a method for manufacturing a battery cell, which includes:
  • An electrode assembly includes a body and a tab, and the tab includes a first segment, a second segment, and a corner segment connected between the first segment and the second segment;
  • connection part includes a terminal connection part and a tab connection part, and the tab connection part has a first surface facing the body;
  • the terminal connection part is connected to the electrode terminal.
  • the present application provides a method for manufacturing a battery cell, which includes:
  • a module for providing an electrode assembly providing a connecting part and providing an electrode terminal
  • the electrode assembly includes a body and a tab
  • the tab includes a first section, a second section, and a connection between the first section and the In the corner segment between the second segments
  • the connection part includes a terminal connection part and a tab connection part
  • the tab connection part has a first surface facing the body
  • an assembling module for fixing the second segment to the first surface, bending the tab so that the corner segment exceeds the first surface along the direction in which the body points to the connecting part, and connecting the terminal connecting portion to the electrode terminal.
  • Fig. 1 is a schematic structural diagram of a vehicle provided according to some embodiments of the present application.
  • Fig. 2 is a schematic diagram of an exploded structure of a battery provided according to some embodiments of the present application
  • Fig. 3 is a schematic diagram of an exploded structure of a battery cell provided according to some embodiments of the present application.
  • FIG. 4 is a cross-sectional view of a battery cell provided according to some embodiments of the present application.
  • Fig. 5 is a partial view of Fig. 4;
  • Fig. 6 is an enlarged view 1 of C in Fig. 5;
  • Fig. 7 is the second enlarged view of C in Fig. 5;
  • FIG. 8 is a schematic structural diagram of a connecting component provided according to some embodiments of the present application.
  • Fig. 9 is a sectional view of the D-D direction of Fig. 8.
  • Fig. 10 is an enlarged view 1 at E of Fig. 9;
  • Figure 11 is the enlarged picture 2 at E of Figure 9;
  • Fig. 12 is a schematic flowchart of a method for manufacturing a battery cell according to some embodiments of the present application.
  • Fig. 13 is a schematic block diagram of a battery cell manufacturing equipment provided according to some embodiments of the present application.
  • Marking description 100-battery; 101-box; 1011-first part; 1012-second part; 10-battery unit; 11-end cover; 12-housing; 121-accommodating cavity; - body; 132 - pole ear; 1321 - first section; 1322 - second section; 1323 - corner section; 14 - connecting part; 141 - terminal connection part; 142 - pole ear connection part;
  • multiple refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two), and “multiple pieces” refers to More than two pieces (including two pieces).
  • a battery refers to a single physical module comprising 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.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of 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, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode collector without the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. Fluid, the positive electrode current collector not coated with the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, 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, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode collector without the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. Fluid, the negative electrode current collector not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, 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 proportion of positive and negative active materials For a battery cell, there are many factors that affect the energy density, such as the proportion of positive and negative active materials, the specific capacity of positive and negative materials, and so on.
  • the inventor in order to solve the problem of low energy density, the inventor has designed a battery cell after intensive research, and the battery cell includes an electrode assembly and a connecting part.
  • the electrode assembly includes a body and tabs.
  • the connection part includes a terminal connection part and a tab connection part, the terminal connection part is used for connecting the electrode terminal, the tab connection part is used for connecting the tab, and the tab connection part has a first surface facing the body.
  • the tab includes a first section connected to the body, a second section fixed to the first surface, and a corner section connected between the first section and the second section, along the direction where the body points to the connecting part, the corner section exceeds the first surface .
  • the corner section formed after the tab is bent exceeds the first surface, and part of the tab is accommodated in the space on the first surface away from the body, thereby reducing the occupation of the tab
  • the first surface of the first surface is close to the space on the side of the body, thereby reducing the distance between the body and the connecting parts, making each part more compact, increasing the space occupied by the body, that is, increasing the proportion of positive and negative active materials, thereby increasing the volume Energy Density.
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery cells disclosed in the embodiments of the present application can be used, but not limited, in electrical equipment such as vehicles, ships, or aircrafts.
  • the battery unit disclosed in this application can be used to form the power supply system of the electrical equipment.
  • the embodiment of the present application provides an electric device that uses a battery as a power source.
  • the electric device can be, but not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, Spacecraft and more.
  • electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc.
  • spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.
  • a vehicle is used as an example to describe an electric device according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided according to some embodiments of the present application.
  • the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle.
  • the interior of the vehicle 1000 is provided with a battery 100 , and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000 .
  • the battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 , used for the circuit system of the vehicle 1000 , for example, used for starting, navigating, and operating power requirements of the vehicle 1000 .
  • the vehicle 1000 may further include a controller 200 and a motor 300 , the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, for starting, navigating and running the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1000 .
  • FIG. 2 is a schematic diagram of an exploded structure of a battery 100 provided according to some embodiments of the present application.
  • the battery 100 includes a case 101 and a battery cell 10 housed in the case 101 .
  • the box body 101 is used to provide an accommodation space for the battery cells 10 , and the box body 101 can adopt various structures.
  • the box body 101 may include a first part 1011 and a second part 1012, the first part 1011 and the second part 1012 cover each other, and the first part 1011 and the second part 1012 jointly define a of accommodation space.
  • the second part 1012 can be a hollow structure with one end open, the first part 1011 can be a plate-shaped structure, and the first part 1011 covers the opening side of the second part 1012, so that the first part 1011 and the second part 1012 jointly define an accommodation space ;
  • the first part 1011 and the second part 1012 can also be hollow structures with one side opening, and the opening side of the first part 1011 is covered by the opening side of the second part 1012 .
  • the battery 100 there may be multiple battery cells 10 , and the multiple battery cells 10 may be connected in series, parallel or mixed.
  • the mixed connection means that the multiple battery cells 10 are both connected in series and in parallel.
  • a plurality of battery cells 10 can be directly connected in series, in parallel or mixed together, and then the whole of the plurality of battery cells 10 is housed in the box 101; of course, the battery 100 can also be a plurality of battery cells 10
  • the battery modules are firstly connected in series, parallel or mixed to form a battery module, and then multiple battery modules are connected in series, parallel or mixed to form a whole and accommodated in the box 101 .
  • the battery 100 may also include other structures, for example, the battery 100 may also include a current flow component for realizing electrical connection between a plurality of battery cells 10 .
  • each battery cell 10 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but not limited thereto.
  • FIG. 3 is a schematic diagram of an exploded structure of a battery cell 10 provided according to some embodiments of the present application
  • FIG. 4 is a cross-sectional view of a battery cell 10 provided according to some embodiments of the present application
  • FIG. 4 is a ladder
  • the cross-sectional view is for showing the connection manner of the connection member 14 and the electrode terminal 15 , and the connection manner of the connection member 14 and the tab 132 .
  • the battery cell 10 refers to the smallest unit constituting the battery 100 .
  • the battery cell 10 includes an end cover 11 , a casing 12 , an electrode assembly 13 , a connecting member 14 and an electrode terminal 15 .
  • the end cap 11 refers to a component that covers the opening of the casing 12 to isolate the internal environment of the battery cell 10 from the external environment.
  • the shape of the end cap 11 can be adapted to the shape of the housing 12 to fit the housing 12 .
  • the end cover 11 can be made of a material (such as aluminum alloy) with certain hardness and strength, so that the end cover 11 is not easy to deform when being squeezed and collided, so that the battery cell 10 can have a better performance. With high structural strength, safety performance can also be improved.
  • the end cover 11 may be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value.
  • the material of the end cap 11 can also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application.
  • an insulator can be provided inside the end cover 11 , and the insulator can be used to isolate the electrical connection components in the housing 12 from the end cover 11 to reduce the risk of short circuit.
  • the insulating member may be plastic, rubber or the like.
  • the casing 12 is a component for matching the end cap 11 to form the internal environment of the battery cell 10 , wherein the formed internal environment can be used to accommodate the electrode assembly 13 , electrolyte and other components.
  • the housing 12 and the end cover 11 can be independent components, and an opening can be provided on the housing 12 , and the internal environment of the battery cell 10 can be formed by making the end cover 11 cover the opening at the opening.
  • the end cover 11 and the housing 12 can also be integrated. Specifically, the end cover 11 and the housing 12 can form a common connection surface before other components are inserted into the housing. When the inside of the housing 12 needs to be encapsulated , then make the end cover 11 cover the housing 12.
  • the shape of the casing 12 can be determined according to the specific shape and size of the electrode assembly 13 .
  • the housing 12 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application.
  • the electrode assembly 13 is a part where the electrochemical reaction occurs in the battery cell 10 .
  • One or more electrode assemblies 13 may be contained within the casing 12 .
  • the electrode assembly 13 is mainly formed by winding or laminating a positive pole piece and a negative pole piece, and a separator is usually provided between the positive pole piece and the negative pole piece.
  • the body 131 of the electrode assembly 13 includes a part of the positive electrode piece and a negative electrode piece with active material and a separator, and the parts of the positive electrode piece and the negative electrode piece without active material respectively constitute tabs 132 .
  • the positive tab and the negative tab can be located at one end of the body 131 together or at both ends of the body 131 .
  • the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 132 is connected to the electrode terminal 15 through the connecting member 14 to form a current loop.
  • the electrode terminal 15 is disposed on the end cap 11 , and the electrode terminal 15 is electrically connected to the electrode assembly 13 through the connecting member 14 for outputting or inputting electric energy of the battery cell 10 .
  • FIG. 5 is a partial view of FIG. 4
  • FIG. 6 is an enlarged view 1 at C of FIG. 5
  • the present application provides a battery cell 10 .
  • the battery cell 10 includes an electrode assembly 13 and a connecting member 14 .
  • the electrode assembly 13 includes a body 131 and a tab 132 .
  • the connection part 14 includes a terminal connection part 141 and a tab connection part 142.
  • the terminal connection part 141 is used for connecting the electrode terminal 15, and the tab connection part 142 is used for connecting the tab 132.
  • the tab connection part 142 has a first Surface 1421.
  • the tab 132 includes a first segment 1321 connected to the body 131, a second segment 1322 fixed to the first surface 1421, and a corner segment 1323 connected between the first segment 1321 and the second segment 1322, pointing to the connecting part along the body 131 In the direction Z of 14 , the corner segment 1323 exceeds the first surface 1421 .
  • the connecting part 14 and the main body 131 are arranged at intervals in the thickness direction of the end cover 11.
  • the direction in which the main body 131 points to the connecting part 14 is the direction indicated by the letter Z in the figure, and the Z direction is perpendicular to the connecting part 14. It may be the thickness direction of the end cap 11 .
  • the tab 132 needs to be bent after being connected to the first surface 1421 of the tab connection portion 142 , and the bent portion of the tab 132 forms a corner section 1323 .
  • the corner section 1323 exceeds the first surface 1421 .
  • the connecting part 14 is a conductive part for connecting the tab 132 and the electrode terminal 15, the terminal connecting part 141 is used for connecting the electrode terminal 15, and the tab connecting part 142 is used for connecting the tab 132, so as to realize the connection between the tab 132 and the electrode terminal 15. electrical connection between.
  • the first surface 1421 is a surface of the connection component 14 facing the body 131 , that is, a surface of the connection component 14 close to the body 131 .
  • the corner section 1323 exceeds the first surface 1421, and part of the tab 132 is accommodated in the space where the first surface 1421 is away from the main body 131, thereby reducing the The first surface 1421 occupied by the small tab 132 is close to the space on the side of the main body 131, thereby reducing the distance between the main body 131 and the connecting part 14, making each part more compact, and the main body 131 is closer to the connecting part 14, increasing the space of the main body 131 Space occupation, that is, increasing the proportion of positive and negative active materials, thereby increasing the volumetric energy density, so that the battery cell 10 has a higher energy density.
  • the corner section 1323 exceeds the second surface 1422 of the lug connection portion 142 away from the body 131 .
  • the second surface 1422 is a surface of the part of the connecting member 14 connected with the second section 1322 facing away from the body 131 .
  • the second surface 1422 and the first surface 1421 are two opposite surfaces of the lug connection portion 142 in the thickness direction of the connection member 14
  • the thickness direction of the connection member 14 is the thickness direction of the end cover 11 .
  • the corner segment 1323 exceeds the second surface 1422, and more parts of the tab 132 are accommodated in the space away from the body 131 on the first surface 1421, which can make the distance between the body 131 and the connecting part 14 smaller, and further increase the space of the body 131 ratio, that is, increasing the ratio of positive and negative electrode active materials increases the energy density of the battery cell 10 .
  • the angle ⁇ between the corner segment 1323 and the second segment 1322 is an obtuse angle.
  • the angle indicated by ⁇ in the figure is the angle between the corner segment 1323 and the second segment 1322, because the corner segment 1323 exceeds the first surface 1421, the corner segment 1323 is facing away from the main body of the first surface 1421
  • One side extends such that an obtuse angle is formed between the corner segment 1323 and the second segment 1322 . If the angle ⁇ between the corner section 1323 and the second section 1322 is small, it is not conducive to the bending of the tab 132, and there is a large contact area between the corner section 1323 and the connecting part 14, which is easy to cause the end of the connecting part 14 to bend.
  • the connecting part 14 will damage the tab 132; if the angle ⁇ between the corner section 1323 and the second section 1322 is large, the corner section 1323 will occupy a large space and affect the interior of the battery cell 10. The utilization of space affects the energy density of the battery cell 10 .
  • the arrangement form of the corner section 1323 and the second section 1322 makes the interference between the connecting part 14 and the corner section 1323 small, which can reduce the damage of the connecting part 14 to the tab 132, and facilitate the bending of the tab 132, and make reasonable use of the battery cell.
  • the battery cell 10 further includes a casing 12 .
  • the casing 12 has an accommodating cavity 121 , and at least part of the connecting member 14 and the electrode assembly 13 are accommodated in the accommodating cavity 121 .
  • the connection part 14 also has an end surface 143 along the thickness direction X of the electrode assembly 13, and the corner section 1323 is located between the end surface 143 and the inner wall of the casing 12.
  • the accommodation chamber 121 has an opening for the electrode assembly 13 to be disposed in the accommodation chamber 121 .
  • the electrode assembly 13 is accommodated in the containing cavity 121 to facilitate the reaction between the electrode assembly 13 and the electrolyte.
  • At least part of the connecting parts 14 are housed in the housing chamber 121, for example, some of the connecting parts 14 are housed in the housing chamber 121, and the other part of the connecting parts 14 are housed in the through holes of the casing 12, so as to be connected with the electrode terminals 15; or, All the connecting parts 14 are accommodated in the receiving cavity 121 , and the electrode terminals 15 extend into the receiving cavity 121 to connect with the connecting parts 14 .
  • the electrode assembly 13 is a flat body, and the electrode assembly 13 has a thickness direction. In the figure, the direction indicated by the letter X is the thickness direction of the electrode assembly 13 .
  • connection part 14 has a first surface 1421 facing the body 131 and a second surface 1422 facing away from the body 131 , and an end surface 143 connects the first surface 1421 and the second surface 1422 .
  • the corner section 1323 is located between the end surface 143 of the connection member 14 along the thickness direction X of the electrode assembly 13 and the inner wall of the casing 12, in other words, in a plane perpendicular to the thickness direction X of the electrode assembly 13, the corner section 1323
  • the projection overlaps the projection of the end face 143 , for example, the projection of the corner segment 1323 is located within the projection of the end face 143 , or part of the projection of the corner segment 1323 overlaps the projection of the end face 143 .
  • the first surface 1421 of the connection part 14 facing the body 131 and the second surface 1422 of the connection part 14 facing away from the body 131 are two interfaces of the projection of the above-mentioned end surface 143.
  • the projection of the corner segment 1323 is located within the projection of the end face 143; when the corner segment 1323 exceeds the second surface 1422 of the connecting part 14 away from the body 131 , the projection of part of the corner segment 1323 overlaps with the projection of the end face 143 .
  • the corner section 1323 is disposed between the end surface 143 and the inner wall of the casing 12 , so as to rationally utilize the inner space of the accommodating cavity 121 , reduce space occupation, and ensure that the battery cell 10 has a higher energy density.
  • the battery cell 10 further includes an end cover 11 and an insulating member 16 .
  • the end cap 11 seals the housing 12 .
  • At least a part of the insulating member 16 is disposed between the end cover 11 and the connection part 14 for isolating the end cover 11 and the connection part 14 .
  • the end cap 11 is used to cover the opening of the housing 12 to connect with the housing 12 to seal the accommodating cavity 121 .
  • the insulator 16 is an insulating part, which is used to realize the insulation between the end cover 11 and the connection part 14 . At least part of the insulator 16 is arranged between the end cover 11 and the connection part 14, for example, a part of the insulator 16 is arranged between the end cover 11 and the connection part 14, and another part of the insulator 16 extends in the opposite direction of the direction Z to abut against On the body 131 ; or, the insulating member 16 is entirely located between the end cover 11 and the connection part 14 .
  • the isolation between the end cap 11 and the connection part 14 is realized by the insulating member 16 to avoid internal short circuit and ensure the safety of the battery cell 10 .
  • the edge of the insulator 16 along the thickness direction X of the electrode assembly 13 is formed with a flange 161 protruding toward the body 131, and the flange 161 is located between the corner section 1323 and the casing. Between 12.
  • the flange 161 is located on the edge of the insulator 16 along the thickness direction X of the electrode assembly 13 and protrudes toward the body 131. between the inner walls.
  • the flange 161 is located between the corner section 1323 and the housing 12 , that is, the corner section 1323 is located between the end surface 143 and the flange 161 .
  • the flange 161 is located between the corner section 1323 and the casing 12 , and can isolate the corner section 1323 from the casing 12 to avoid internal short circuit and ensure the safety of the battery cell 10 .
  • the thickness of the tab 132 is A, and the distance between the end surface 143 and the flange 161 is B, satisfying 1% ⁇ A/B ⁇ 20%.
  • the tab 132 is composed of multiple layers of tabs 132 , and the thickness A of the tab 132 is the number of layers of the tab 132 multiplied by the thickness of each tab 132 .
  • the end surface 143 is arranged parallel to the flange 161 , and the distance B between the end surface 143 and the flange 161 may be, in a direction perpendicular to the end surface 143 , the distance from a point on the end surface 143 to the flange 161 .
  • the tab 132 is easy to bend, and correspondingly, the distance B between the end surface 143 and the flange 161 can be small.
  • the ratio relationship between the thickness A of the tab 132 and the distance B between the end surface 143 and the flange 161 satisfies 1% ⁇ A/B ⁇ 20%, which can not only reduce the difficulty of bending the tab 132, but also facilitate the accommodation of the corner section 1323. Avoid interference between the corner segment 1323 and other components.
  • the ratio relationship between the thickness A of the tab 132 and the distance B between the end surface 143 and the flange 161 satisfies 2% ⁇ A/B ⁇ 8%, ensuring that the tab 132 is easy to bend and corner Section 1323 is received between end face 143 and flange 161 .
  • the corner section 1323 abuts against the side of the insulating member 16 away from the end cover 11 .
  • the side of the insulator 16 away from the end cover 11 is the side of the insulator 16 facing the body 131, and the corner section 1323 is connected to the end cover 11 of the insulator 16.
  • One side of the insulator 16 abuts against, that is, the corner section 1323 abuts against one side of the insulating member 16 facing the body 131 .
  • the corner section 1323 abuts against the insulator 16
  • the distance between the body 131 and the connection part 14 can be further reduced, and the body 131 occupies a relatively high proportion in the internal space of the battery cell 10, that is, the positive and negative electrodes
  • the higher proportion of active materials makes the battery cell 10 have higher energy density.
  • adhesive tape 17 is bonded to both sides of the tab 132 in the thickness direction, that is, on the pole tab 132. Both sides of the connection position between the ear 132 and the connecting part 14 are bonded with adhesive tape 17, for example, the adhesive tape 17 on one side of the ear 132 is bonded to the second surface 1422 of the connecting part 14, and the corner section 1323 is abutted by the adhesive tape 17. Connected to the side of the insulating member 16 facing the body 131 .
  • FIG. 8 is a schematic structural diagram of a connecting component 14 provided according to some embodiments of the present application.
  • the battery cell 10 includes two electrode assemblies 13, the positive tabs of the two electrode assemblies 13 are connected to a connecting part 14, and the two electrode assemblies 13 The negative pole tab is connected to another connection member 14 .
  • the connection part 14 includes two tab connection parts 142, the two tab connection parts 142 are arranged at intervals along the thickness direction X of the electrode assembly 13, and the two tab connection parts 142 respectively connect two The tab 132 of the electrode assembly 13 .
  • Fig. 9 is a cross-sectional view of the D-D direction of Fig. 8
  • Fig. 10 is an enlarged view 1 at E of Fig. 9, showing the fillet 144 on the connecting part 14
  • Fig. 11 is E of Fig. 9
  • the second enlarged view shows the elastic member 145 on the connecting part 14 .
  • a rounded corner 144 or an elastic member 145 is provided at the junction of the first surface 1421 and the end surface 143 .
  • intersection of the first surface 1421 and the end surface 143 is the position where the tab 132 abuts against the connecting member 14 after the tab 132 is bent, that is, the position of the connecting member 14 corresponding to the intersection of the second segment 1322 and the corner segment 1323 .
  • the corner section 1323 is located between the end surface 143 and the inner wall of the housing 12, and the intersection of the tab 132 and the first surface 1421 and the end surface 143 abuts, during the bending process of the tab 132, the intersection is easy to cut the pole.
  • the ear 132 affects the overcurrent capability of the tab 132 and the service life of the battery cell 10 .
  • rounded corners 144 may be provided at the intersection of the first surface 1421 and the end surface 143 , which can realize a smooth transition between the first surface 1421 and the end surface 143 and reduce damage to the tab 132 at the intersection.
  • the intersection of the first surface 1421 and the end surface 143 can also be provided with an elastic member 145
  • the elastic member 145 can be silica gel, foam, nitrile rubber, neoprene rubber, butyl rubber, ethylene propylene rubber, Synthetic resin, synthetic rubber, etc., play a buffering role, and can be deformed after being stressed, so as to avoid cutting the tab 132 at the junction of the first surface 1421 and the end surface 143 .
  • There are many ways to connect the elastic member 145 and the connecting member 14 such as gluing or spraying and solidification.
  • spray glue is applied at the junction of the first surface 1421 and the end surface 143 , and the glue solidifies to form the elastic member 145 .
  • the rounded corner 144 or the elastic member 145 provided at the junction of the first surface 1421 and the end surface 143 can buffer the friction between the tab 132 and the connecting part 14 , avoid cutting the tab 132 , and ensure the service life of the battery cell 10 .
  • the terminal connection portion 141 protrudes toward a side away from the body 131 relative to the tab connection portion 142 .
  • the terminal connection part 141 protrudes toward the side away from the body 131 relative to the tab connection part 142, which means that the terminal connection part 141 protrudes relative to the tab connection part 142 along the direction Z, and the terminal connection part 141 protrudes relative to the tab connection part. 142 is away from the body 131 .
  • the terminal connection part 141 protrudes toward the side away from the body 131 , which is convenient for connecting with the electrode terminal 15 , and avoids protruding toward the body 131 to occupy the internal space of the battery cell 10 , ensuring the energy density of the battery cell 10 .
  • the present application also provides a battery 100, which includes the battery cell 10 described in any of the above schemes.
  • the present application also provides an electric device, which includes the battery cell 10 described in any solution above, and the battery cell 10 is used to provide electric energy for the electric device.
  • the present application provides a battery cell 10 .
  • the battery cell 10 includes an end cover 11 , a casing 12 , an electrode assembly 13 , a connection part 14 , an electrode terminal 15 and an insulator 16 .
  • the casing 12 includes an accommodating cavity 121 with an opening, and the end cap 11 is disposed on the opening to close the accommodating cavity 121 of the casing 12 .
  • the electrode assembly 13 and at least a part of the connection part 14 are accommodated in the accommodation cavity 121 of the casing 12 .
  • the connection part 14 includes a terminal connection part 141 and a tab connection part 142 , the terminal connection part 141 is used for connecting the electrode terminal 15 , the tab connection part 142 is used for connecting the tab 132 , and has a first surface 1421 facing the body 131 .
  • the electrode assembly 13 includes a body 131 and a tab 132.
  • the tab 132 includes a first segment 1321 connected to the body 131, a second segment 1322 fixed to the first surface 1421 and connected between the first segment 1321 and the second segment 1322. 1323 of the corner segment.
  • the main body 131 and the connecting part 14 are arranged in parallel and distributed along the thickness direction of the end cover 11 at intervals.
  • the corner section 1323 exceeds the first surface 1421 . At least part of the insulator 16 is located between the connecting part 14 and the end cap 11 to isolate the connecting part 14 and the end cap 11 .
  • the connection part 14 also has an end surface 143 along the thickness direction X of the electrode assembly 13, the edge of the insulator 16 along the thickness direction X of the electrode assembly 13 is formed with a flange 161 protruding toward the body 131, and the corner segment 1323 is located between the end surface 143 and Between the flanges 161 , the flanges 161 are located between the corner section 1323 and the housing 12 . The corner segment 1323 abuts against a side of the insulating member 16 away from the end cover 11 .
  • the corner segment 1323 exceeds the first surface 1421 and abuts against the side of the insulating member 16 away from the end cover 11, so that the distance between the body 131 and the connecting part 14 is small, and the space occupied by the body 131 can be increased, that is, the space occupied by the body 131 can be increased.
  • the proportion of positive and negative active materials has a higher energy density.
  • Fig. 12 is a schematic flowchart of a method for manufacturing a battery cell according to some embodiments of the present application.
  • the present application provides a method for manufacturing a battery cell.
  • the method for manufacturing a battery cell may include:
  • the electrode assembly 13 includes a body 131 and a tab 132.
  • the tab 132 includes a first segment 1321, a second segment 1322, and a corner segment 1323 connected between the first segment 1321 and the second segment 1322;
  • connection part 14 includes a terminal connection part 141 and a tab connection part 142, and the tab connection part 142 has a first surface 1421 facing the body 131;
  • step "401, provide electrode assembly 13", step “402, provide connecting member 14" and step “403, provide electrode terminal 15” is not limited, in some embodiments, the steps can be followed in sequence “402, provide the connecting part 14", step “401, provide the electrode assembly 13” and step “403, provide the electrode terminal 15" in order, or, you can also follow the order of "403, provide the electrode terminal 15", step " 401, providing the electrode assembly 13" and step “402, providing the connecting part 14".
  • Fig. 13 is a schematic block diagram of a battery cell manufacturing device 500 provided according to some embodiments of the present application.
  • the present application provides a battery cell manufacturing device 500 , as shown in FIG. 13 , the battery cell manufacturing device 500 includes a providing module 501 and an assembling module 502 .
  • the providing module 501 is used to provide the electrode assembly 13, the connecting part 14 and the electrode terminal 15.
  • the electrode assembly 13 includes a body 131 and a tab 132.
  • the tab 132 includes a first section 1321, a second section 1322 and a section connected to the first section.
  • connection member 14 includes a terminal connection portion 141 and a tab connection portion 142
  • the tab connection portion 142 has a first surface 1421 facing the body 131 .
  • the assembly module 502 is used to fix the second section 1322 on the first surface 1421, bend the tab 132 so that the corner section 1323 exceeds the first surface 1421 along the direction Z of the main body 131 pointing to the connecting part 14, and connect the terminal connection part 141
  • the electrode terminal 15 is connected.

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  • Battery Mounting, Suspending (AREA)

Abstract

本申请实施例提供一种电池单体、电池、用电设备及电池单体的制造方法和设备。电池单体包括：电极组件，包括本体和极耳；连接部件，包括端子连接部和极耳连接部，端子连接部用于连接电极端子，极耳连接部用于连接极耳，极耳连接部具有朝向本体的第一表面；其中，极耳包括连接于本体的第一段、固定于第一表面的第二段以及连接于第一段和第二段之间的拐角段，沿本体指向连接部件的方向，拐角段超出所述第一表面。该电池单体，具有较高的能量密度。

Description

电池单体、电池、用电设备及电池单体的制造方法和设备 技术领域
本申请涉及电池技术领域，特别是涉及一种电池单体、电池、用电设备及电池单体的制造方法和设备。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
在电池技术的发展中，除了提高电池的安全性外，电池的能量密度也是一个不可忽视的问题。因此，如何提高电池的能量密度，是电池技术中一个亟需解决的技术问题。
发明内容
本申请的目的在于提供一种电池单体、电池、用电设备及电池单体的制造方法和设备。该电池单体，具有较高的能量密度。
本申请是通过如下技术方案实现的：
第一方面，本申请提供了一种电池单体，其包括：
电极组件，包括本体和极耳；
连接部件，包括端子连接部和极耳连接部，所述端子连接部用于连接电极端子，所述极耳连接部用于连接所述极耳，所述极耳连接部具有朝向所述本体的第一表面；
其中，所述极耳包括连接于所述本体的第一段、固定于所述第一表面的第二段以及连接于所述第一段和所述第二段之间的拐角段，沿所述本体指向所述连接部件的方向，所述拐角段超出所述第一表面。
根据本申请的电池单体，沿本体指向连接部件的方向，拐角段超出第一表面，部分极耳容纳于第一表面远离本体的空间内，从而减小极耳占用的第一表面靠近本体一侧的空间，进而减小本体与连接部件之间的距离，使各部件更加紧凑，进而提高体积能量密度。
根据本申请的一些实施例，沿所述本体指向所述连接部件的方向，所述拐角段超出所述极耳连接部的远离所述本体的第二表面。
在上述方案中，拐角段超出第二表面，更多部分的极耳容纳于第一表面远离本体的空间内，能够使得本体与连接部件之间的距离更小，进一步增加本体的空间占比，也即，增加正负极活性物质占比，提高电池单体的能量密度。
根据本申请的一些实施例，所述拐角段与所述第二段之间的夹角为钝角。
在上述方案中，拐角段与第二段的设置形式，使得连接部件与拐角段的干涉力 度小，可以减少连接部件对极耳的损伤，并且便于实现极耳折弯。
根据本申请的一些实施例，所述电池单体还包括：壳体，具有容纳腔，至少部分所述连接部件和所述电极组件容纳于所述容纳腔内；所述连接部件还具有沿所述电极组件的厚度方向的端面，所述拐角段位于所述端面和所述壳体的内壁之间。
在上述方案中，拐角段设置于端面和壳体的内壁之间，合理利用容纳腔的内部空间，减少空间占用，保证电池单体具有较高的能量密度。
根据本申请的一些实施例，所述电池单体还包括：端盖，密封所述壳体；绝缘件，至少部分所述绝缘件设置于所述端盖和所述连接部件之间，用于隔离所述端盖和所述连接部件。
在上述方案中，通过绝缘件实现端盖与连接部件的隔离，避免内部短路，保证电池单体的安全性。
根据本申请的一些实施例，所述绝缘件的沿所述电极组件的厚度方向的边缘形成有朝向所述本体凸出的凸缘，所述凸缘位于所述拐角段和所述壳体之间。
在上述方案中，凸缘位于拐角段和壳体之间，能够起到隔离拐角段和壳体的作用，避免内部短路，保证电池单体的安全性。
根据本申请的一些实施例，所述极耳的厚度为A，所述端面与所述凸缘之间的距离为B，满足1％≤A/B≤20％。
在上述方案中，上述数值范围，既能够便于降低极耳折弯难度，还能够便于容纳拐角段。
根据本申请的一些实施例，所述拐角段与所述绝缘件的背离所述端盖的一侧抵接。
在上述方案中，拐角段与绝缘件抵接，可以进一步减小本体与连接部件之间的间距，使得电池单体具有较高的能量密度。
根据本申请的一些实施例，所述第一表面与所述端面的交汇处设置有圆角或弹性件。
在上述方案中，第一表面与端面的交汇处设置的圆角或弹性件，能够缓冲极耳与连接部件之间的摩擦，避免割伤极耳，保证电池单体的使用寿命。
根据本申请的一些实施例，所述端子连接部相对于所述极耳连接部朝向背离所述本体的一侧凸出。
在上述方案中，端子连接部相对于极耳连接部凸出，既便于与电极端子连接，还可以避免朝向本体凸出而占用电池单体的内部空间，保证电池单体的能量密度。
第二方面，本申请提供了一种电池，其包括如上述任一方案所述的电池单体。
第三方面，本申请提供了一种用电设备，其包括如上述任一方案所述的电池单体，所述电池单体用于提供电能。
第四方面，本申请提供了一种电池单体的制造方法，其包括：
提供电极组件，所述电极组件包括本体和极耳，所述极耳包括第一段、第二段以及连接于所述第一段和所述第二段之间的拐角段；
提供连接部件，所述连接部件包括端子连接部和极耳连接部，所述极耳连接部 具有朝向所述本体的第一表面；
提供电极端子；
将所述第二段固定于所述第一表面，折弯所述极耳，使得沿所述本体指向所述连接部件的方向，所述拐角段超出所述第一表面；
将所述端子连接部连接所述电极端子。
第五方面，本申请提供了一种电池单体的制造方法，其包括：
提供模块，用于提供电极组件、提供连接部件及提供电极端子，所述电极组件包括本体和极耳，所述极耳包括第一段、第二段以及连接于所述第一段和所述第二段之间的拐角段，所述连接部件包括端子连接部和极耳连接部，所述极耳连接部具有朝向所述本体的第一表面；
组装模块，用于将所述第二段固定于所述第一表面，折弯所述极耳，使得沿所述本体指向所述连接部件的方向，所述拐角段超出所述第一表面，并将所述端子连接部连接所述电极端子。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
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为根据本申请一些实施例提供的车辆的结构示意图；
图2为根据本申请一些实施例提供的电池的分解结构示意图
图3为根据本申请一些实施例提供的电池单体的分解结构示意图；
图4为根据本申请一些实施例提供的电池单体的剖视图；
图5为图4的局部视图；
图6为图5的C处放大图一；
图7为图5的C处放大图二；
图8为根据本申请一些实施例提供的连接部件的结构示意图；
图9为图8的D-D方向的剖视图；
图10为图9的E处放大图一；
图11为图9的E处放大图二；
图12为根据本申请一些实施例提供的电池单体的制造方法的示意性流程图；
图13为根据本申请一些实施例提供的电池单体的制造设备的示意性框图；
在附图中，附图并未按照实际的比例绘制。
标记说明：100-电池；101-箱体；1011-第一部分；1012-第二部分；10-电池单 体；11-端盖；12-壳体；121-容纳腔；13-电极组件；131-本体；132-极耳；1321-第一段；1322-第二段；1323-拐角段；14-连接部件；141-端子连接部；142-极耳连接部；
1421-第一表面；1422-第二表面；143-端面；144-圆角；145-弹性件；15-电极端子；
16-绝缘件；161-凸缘；17-胶带；200-控制器；300-马达；1000-车辆。
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。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文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。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“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。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，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，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，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实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；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或两个元件的相互作用关系。 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实施例中的具体含义。
在本申请中，所提及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，本申请中所提及的电池可以包括电池模块或电池包等。
电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔离膜组成。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，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。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，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
电池技术的发展要同时考虑多方面的设计因素，例如，放电容量、充放电倍率、安全性及使用寿命等性能参数，另外，还需要考虑能量密度。
对于电池单体来说，影响能量密度的因素很多，例如，正负极活性物质占比、正负极材料的比容量等。发明人研究发现，电池单体中，沿电极组件的本体指向连接部件的方向，极耳的拐角处不超过连接部件的朝向电极组件的本体的一面，连接部件与电极组件的本体之间的距离较大，正负极活性物质占比较低，浪费电池单体的内部空间，造成内部空间利用率低，使得能量密度较低。
鉴于此，为了解决能量密度较低的问题，发明人经过深入研究，设计了一种电池单体，该电池单体包括电极组件及连接部件。电极组件包括本体和极耳。连接部件包括端子连接部和极耳连接部，端子连接部用于连接电极端子，极耳连接部用于连接极耳，极耳连接部具有朝向本体的第一表面。极耳包括连接于本体的第一段、固定于第一表面的第二段以及连接于第一段和第二段之间的拐角段，沿本体指向连接部件的方向，拐角段超出第一表面。
在这样的电池单体中，沿本体指向连接部件的方向，极耳折弯后形成的拐角段超出第一表面，部分极耳容纳于第一表面远离本体的空间内，从而减小极耳占用的第一表面靠近本体一侧的空间，进而减小本体与连接部件之间的距离，使各部件更加紧凑，增加本体的空间占用，也即，增加正负极活性物质占比，进而提高体积能量密度。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。
本申请实施例公开的电池单体可以但不限用于车辆、船舶或飞行器等用电设备中。可以使用具备本申请公开的电池单体组成该用电设备的电源系统。
本申请实施例提供一种使用电池作为电源的用电设备，用电设备可以为但不限 于手机、平板电脑、笔记本电脑、电动玩具、电动工具、电动自行车、电动摩托车、电动汽车、轮船、航天器等等。其中，电动玩具可以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，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电装置为车辆为例进行说明。
请参见图1，图1为根据本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、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。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源，用于车辆1000的电路系统，例如用于车辆1000的启动、导航和运行时的工作用电需求。
车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000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100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参见图2，图2为根据本申请一些实施例提供的电池100的分解结构示意图。电池100包括箱体101和电池单体10，电池单体10容纳于箱体101内。其中，箱体101用于为电池单体10提供容纳空间，箱体101可以采用多种结构。在一些实施例中，箱体101可以包括第一部分1011和第二部分1012，第一部分1011与第二部分1012相互盖合，第一部分1011和第二部分1012共同限定出用于容纳电池单体10的容纳空间。第二部分1012可以为一端开口的空心结构，第一部分1011可以为板状结构，第一部分1011盖合于第二部分1012的开口侧，以使第一部分1011与第二部分1012共同限定出容纳空间；第一部分1011和第二部分1012也可以是均为一侧开口的空心结构，第一部分1011的开口侧盖合于第二部分1012的开口侧。
在电池100中，电池单体10可以是多个，多个电池单体10之间可串联或并联或混联，混联是指多个电池单体10中既有串联又有并联。多个电池单体10之间可直接串联或并联或混联在一起，再将多个电池单体10构成的整体容纳于箱体101内；当然，电池100也可以是多个电池单体10先串联或并联或混联组成电池模块形式，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101内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体10之间的电连接。
其中，每个电池单体10可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。
请参见图3和图4，图3为根据本申请一些实施例提供的电池单体10的分解结构示意图；图4为根据本申请一些实施例提供的电池单体10的剖视图，图4为阶梯剖视图，其为了体现连接部件14与电极端子15的连接方式，以及连接部件14与极耳 132的连接方式。电池单体10是指组成电池100的最小单元。如图3和图4所示，电池单体10包括端盖11、壳体12、电极组件13、连接部件14及电极端子15。
端盖11是指盖合于壳体12的开口处以将电池单体10的内部环境隔绝于外部环境的部件。不限地，端盖11的形状可以与壳体12的形状相适应以配合壳体12。在一些实施例中，端盖11可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖11在受挤压碰撞时就不易发生形变，使电池单体10能够具备更高的结构强度，安全性能也可以有所提高。端盖11上可以设置有用于在电池单体10的内部压力或温度达到阈值时泄放内部压力的泄压机构。端盖11的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。在一些实施例中，在端盖11的内侧还可以设置有绝缘件，绝缘件可以用于隔离壳体12内的电连接部件与端盖11，以降低短路的风险。示例性的，绝缘件可以是塑料、橡胶等。
壳体12是用于配合端盖11以形成电池单体10的内部环境的组件，其中，形成的内部环境可以用于容纳电极组件13、电解液以及其他部件。壳体12和端盖11可以独立的部件，可以于壳体12上设置开口，通过在开口处使端盖11盖合开口以形成电池单体10的内部环境。不限地，也可以使端盖11和壳体12一体化，具体地，端盖11和壳体12可以在其他部件入壳前先形成一个共同的连接面，当需要封装壳体12的内部时，再使端盖11盖合壳体12。壳体12的形状可以根据电极组件13的具体形状和尺寸大小来确定。壳体12的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
电极组件13是电池单体10中发生电化学反应的部件。壳体12内可以包含一个或多个电极组件13。电极组件13主要由正极极片和负极极片卷绕或层叠放置形成，并且通常在正极极片与负极极片之间设有隔离膜。电极组件13的本体131包括正极极片和负极极片具有活性物质的部分以及隔离膜，正极极片和负极极片不具有活性物质的部分各自构成极耳132。正极极耳和负极极耳可以共同位于本体131的一端或是分别位于本体131的两端。在电池100的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳132通过连接部件14连接电极端子15以形成电流回路。
电极端子15设置于端盖11上，电极端子15通过连接部件14与电极组件13电连接，以用于输出或输入电池单体10的电能。
根据本申请的一些实施例，请参见图5和图6，图5为图4的局部视图，图6为图5的C处放大图一。本申请提供了一种电池单体10。如图5和图6所示，电池单体10包括电极组件13及连接部件14。电极组件13包括本体131和极耳132。连接部件14包括端子连接部141和极耳连接部142，端子连接部141用于连接电极端子15，极耳连接部142用于连接极耳132，极耳连接部142具有朝向本体131的第一表面1421。极耳132包括连接于本体131的第一段1321、固定于第一表面1421的第二段1322以及连接于第一段1321和第二段1322之间的拐角段1323，沿本体131指向连接部件14的方向Z，拐角段1323超出第一表面1421。
电池单体10中，连接部件14和本体131在端盖11的厚度方向间隔设置，本体131指向连接部件14的方向为图中的字母Z所指示的方向，Z方向垂直于连接部件 14，也可以为端盖11的厚度方向。
在电池单体10装配过程中，极耳132与极耳连接部142的第一表面1421连接后需要进行折弯，极耳132折弯后的折弯部位形成拐角段1323。在电极组件13放置于壳体12内并将端盖11与壳体12封装后，沿本体131指向连接部件14的方向Z，拐角段1323超出第一表面1421。
连接部件14为用于连接极耳132和电极端子15的导电部件，端子连接部141用于连接电极端子15，极耳连接部142用于连接极耳132，实现极耳132与电极端子15之间的电连接。第一表面1421为连接部件14的朝向本体131的面，也即，连接部件14靠近本体131的面。
根据本申请实施例的电池单体10，沿本体131指向连接部件14的方向Z，拐角段1323超出第一表面1421，部分极耳132容纳于第一表面1421远离本体131的空间内，从而减小极耳132占用的第一表面1421靠近本体131一侧的空间，进而减小本体131与连接部件14之间的距离，使各部件更加紧凑，本体131更靠近连接部件14，增加本体131的空间占用，也即，增加正负极活性物质占比，进而提高体积能量密度，使得电池单体10具有较高的能量密度。
根据本申请的一些实施例，如图6所示，沿本体131指向连接部件14的方向Z，拐角段1323超出极耳连接部142的远离本体131的第二表面1422。
第二表面1422为连接部件14的与第二段1322连接的部分的背离本体131的面。换句话说，第二表面1422与第一表面1421为极耳连接部142在连接部件14的厚度方向的相对的两个面，连接部件14的厚度方向为端盖11的厚度方向。
拐角段1323超出第二表面1422，更多部分的极耳132容纳于第一表面1421远离本体131的空间内，能够使得本体131与连接部件14之间的距离更小，进一步增加本体131的空间占比，也即，增加正负极活性物质占比，提高电池单体10的能量密度。
根据本申请的一些实施例，如图6所示，拐角段1323与第二段1322之间的夹角α为钝角。
如图6所示，图中α所指示的角为拐角段1323与第二段1322之间的夹角，由于拐角段1323超出第一表面1421，拐角段1323朝向第一表面1421的背离主体的一侧延伸，使得拐角段1323与第二段1322之间形成钝角。如果拐角段1323与第二段1322之间的角度α较小，则不利于极耳132折弯，拐角段1323与连接部件14之间具有较大的接触面积，容易造成连接部件14的端部对极耳132的干涉，严重时连接部件14损伤极耳132；如果拐角段1323与第二段1322之间的角度α较大，则拐角段1323占用较大的空间，影响电池单体10内部空间的利用率，影响电池单体10的能量密度。
拐角段1323与第二段1322的设置形式，使得连接部件14与拐角段1323的干涉力度小，可以减少连接部件14对极耳132的损伤，并且便于实现极耳132折弯，合理利用电池单体10的内部空间。
根据本申请的一些实施例，如图4和图6所示，电池单体10还包括壳体12。壳体12具有容纳腔121，至少部分连接部件14和电极组件13容纳于容纳腔121内。连接部件14还具有沿电极组件13的厚度方向X的端面143，拐角段1323位于端面 143和壳体12的内壁之间。
容纳腔121具有开口，以供电极组件13设置于容纳腔121内。电极组件13容纳于容纳腔121内，以便于电极组件13与电解液发生反应。
至少部分连接部件14容纳于容纳腔121内，例如，部分连接部件14容纳于容纳腔121内，另一部分连接部件14容纳于壳体12的通孔内，以便于与电极端子15连接；或者，全部连接部件14容纳于容纳腔121内，电极端子15伸入容纳腔121与连接部件14连接。
电极组件13呈扁平体，电极组件13具有厚度方向，图中，字母X所指示的方向为电极组件13的厚度方向。
连接部件14具有朝向本体131的第一表面1421和背离本体131的第二表面1422，端面143连接第一表面1421和第二表面1422。
拐角段1323位于连接部件14的沿电极组件13的厚度方向X的端面143和壳体12的内壁之间，换句话说，在垂直于电极组件13的厚度方向X的平面内，拐角段1323的投影与端面143的投影重叠，例如，拐角段1323的投影位于端面143的投影内，或者，部分拐角段1323的投影与端面143的投影重叠。连接部件14的朝向本体131的第一表面1421和连接部件14的背离本体131的第二表面1422为上述端面143的投影的两个分界面，当拐角段1323超出连接部件14的朝向本体131的第一表面1421、未超出连接部件14的背离本体131的第二表面1422时，拐角段1323的投影位于端面143的投影内；当拐角段1323超出连接部件14的背离本体131的第二表面1422时，部分拐角段1323的投影与端面143的投影重叠。
拐角段1323设置于端面143和壳体12的内壁之间，合理利用容纳腔121的内部空间，减少空间占用，保证电池单体10具有较高的能量密度。
请参见图7，图7为图5的C处放大图二。根据本申请的一些实施例，如图4和图7所示，电池单体10还包括端盖11及绝缘件16。端盖11密封壳体12。至少部分绝缘件16设置于端盖11和连接部件14之间，用于隔离端盖11和连接部件14。
端盖11用于盖设于壳体12的开口处，以与壳体12连接密封容纳腔121。
绝缘件16为绝缘部件，用于实现端盖11与连接部件14之间的绝缘。至少部分绝缘件16设置于端盖11和连接部件14之间，例如，部分绝缘件16设置于端盖11和连接部件14之间，另一部分绝缘件16朝方向Z的反方向延伸抵接到本体131上；或者，绝缘件16整体位于端盖11和连接部件14之间。
通过绝缘件16实现端盖11与连接部件14的隔离，避免内部短路，保证电池单体10的安全性。
根据本申请的一些实施例，如图7所示，绝缘件16的沿电极组件13的厚度方向X的边缘形成有朝向本体131凸出的凸缘161，凸缘161位于拐角段1323和壳体12之间。
凸缘161位于绝缘件16的沿电极组件13的厚度方向X的边缘，并且朝向本体131凸出，换句话说，在电极组件13的厚度方向X上，凸缘161位于端面143和壳体12的内壁之间。
凸缘161位于拐角段1323和壳体12之间，也即，拐角段1323位于端面143和凸缘161之间。
凸缘161位于拐角段1323与壳体12之间，能够起到隔离拐角段1323和壳体12的作用，避免内部短路，保证电池单体10的安全性。
根据本申请的一些实施例，如图7所示，极耳132的厚度为A，端面143与凸缘161之间的距离为B，满足1％≤A/B≤20％。
极耳132由多层极耳132构成，极耳132的厚度A为极耳132的层数乘以每层极耳132的厚度。端面143与凸缘161平行设置，端面143与凸缘161之间的距离B可以为，在垂直于端面143的方向上，端面143上的一点到凸缘161的距离。
极耳132的厚度A越厚，端面143与凸缘161之间的距离B越大，以便于容纳拐角段1323。极耳132的厚度A较小时，极耳132易于折弯，对应的，端面143与凸缘161之间的距离B可以较小。极耳132的厚度A和端面143与凸缘161之间的距离B的比值关系，满足1％≤A/B≤20％，既能够便于降低极耳132折弯难度，还能够便于容纳拐角段1323，避免拐角段1323与其他部件干涉。
在一些实施例中，极耳132的厚度A和端面143与凸缘161之间的距离B的比值关系，满足2％≤A/B≤8％，保证极耳132易于折弯，并且便于拐角段1323容纳于端面143与凸缘161之间。
根据本申请的一些实施例，如图7所示，拐角段1323与绝缘件16的背离端盖11的一侧抵接。
由于绝缘件16用于隔离连接部件14和端盖11，绝缘件16的背离端盖11的一侧为绝缘件16的朝向本体131的一侧，拐角段1323与绝缘件16的背离端盖11的一侧抵接，也即，拐角段1323与绝缘件16的朝向本体131的一侧抵接。
当拐角段1323与绝缘件16抵接时，可以进一步减小本体131与连接部件14之间的间距，本体131在电池单体10的内部空间内占用较高的比例，也即，正负极活性物质占比较高，使得电池单体10具有较高的能量密度。
根据本申请的一些实施例，如图7所示，为了避免内部短路，在极耳132与连接部件14连接之后，极耳132的厚度方向的两面均粘接有胶带17，也即，在极耳132与连接部件14的连接位置处的两侧均粘接有胶带17，例如，位于极耳132一侧的胶带17粘接于连接部件14的第二表面1422，拐角段1323通过胶带17抵接于绝缘件16朝向本体131的一侧。
请参见图8，图8为根据本申请一些实施例提供的连接部件14的结构示意图。根据本申请的一些实施例，如图3和图4所示，电池单体10包括两个电极组件13，两个电极组件13的正极极耳连接于一个连接部件14，两个电极组件13的负极极耳连接于另一个连接部件14。如图5和图8所示，连接部件14包括两个极耳连接部142，两个极耳连接部142沿电极组件13的厚度方向X间隔设置，两个极耳连接部142分别连接两个电极组件13的极耳132。
请参见图9-图11，图9为图8的D-D方向的剖视图，图10为图9的E处放大图一，示出了连接部件14上的圆角144；图11为图9的E处放大图二，示出了连 接部件14上的弹性件145。根据本申请的一些实施例，如图9-图11所示，第一表面1421与端面143的交汇处设置有圆角144或弹性件145。
第一表面1421与端面143的交汇处为极耳132折弯后极耳132与连接部件14抵接的部位，也即，第二段1322与拐角段1323的交汇处对应的连接部件14的位置。
由于拐角段1323位于端面143和壳体12的内壁之间，并且极耳132和第一表面1421与端面143的交汇处抵接，在极耳132折弯过程中，该交汇处容易割伤极耳132，影响极耳132的过流能力，影响电池单体10的使用寿命。
如图10所示，第一表面1421与端面143的交汇处可以设置有圆角144，能够实现第一表面1421与端面143的圆滑过渡，减小该交汇处对极耳132的损伤。
如图11所示，第一表面1421与端面143的交汇处也可以设置有弹性件145，弹性件145可以为硅胶、泡棉、丁晴橡胶、氯丁橡胶、丁基橡胶、乙丙橡胶、合成树脂，合成橡胶等，起到缓冲的作用，在受力后能够变形，以避免第一表面1421与端面143的交汇处割伤极耳132。弹性件145与连接部件14的连接方式为多种，可以为胶粘，可以为喷胶凝固成型。在一些实施例中，在第一表面1421与端面143的交汇处做喷胶处理，胶液凝固成型弹性件145。
第一表面1421与端面143的交汇处设置的圆角144或弹性件145，能够缓冲极耳132与连接部件14之间的摩擦，避免割伤极耳132，保证电池单体10的使用寿命。
根据本申请的一些实施例，如图5和图9所示，端子连接部141相对于极耳连接部142朝向背离本体131的一侧凸出。
端子连接部141相对于极耳连接部142朝向背离本体131的一侧凸出是指，端子连接部141沿方向Z相对于极耳连接部142凸出，端子连接部141相对于极耳连接部142远离本体131。
端子连接部141朝向背离本体131的一侧凸出，既便于与电极端子15连接，还可以避免朝向本体131凸出而占用电池单体10的内部空间，保证电池单体10的能量密度。
根据本申请的一些实施例，本申请还提供了一种电池100，其包括以上任一方案所述的电池单体10。
根据本申请的一些实施例，本申请还提供了一种用电设备，其包括以上任一方案所述的电池单体10，并且电池单体10用于为用电设备提供电能。
根据本申请的一些实施例，参见图3-图7，本申请提供了一种电池单体10。电池单体10包括端盖11、壳体12、电极组件13、连接部件14、电极端子15及绝缘件16。壳体12包括具有开口的容纳腔121，端盖11盖设于开口处以封闭壳体12的容纳腔121。电极组件13和至少部分连接部件14容纳于壳体12的容纳腔121内。连接部件14包括端子连接部141和极耳连接部142，端子连接部141用于连接电极端子15，极耳连接部142用于连接极耳132，具有朝向本体131的第一表面1421。电极组件13包括本体131和极耳132，极耳132包括连接于本体131的第一段1321、固定于第一表面1421的第二段1322以及连接于第一段1321和第二段1322之间的拐角段1323。 本体131和连接部件14平行设置，且沿端盖11的厚度方向间隔分布。沿本体131指向连接部件14的方向Z，拐角段1323超出第一表面1421。至少部分绝缘件16位于连接部件14和端盖11之间，以隔离连接部件14和端盖11。连接部件14还具有沿电极组件13的厚度方向X的端面143，绝缘件16的沿电极组件13的厚度方向X的边缘形成有朝向本体131凸出的凸缘161，拐角段1323位于端面143和凸缘161之间，凸缘161位于拐角段1323和壳体12之间。拐角段1323抵接于绝缘件16的背离端盖11的一侧。
拐角段1323超出第一表面1421且抵接于绝缘件16的背离端盖11的一侧，使得本体131与连接部件14之间的距离较小，能够增加本体131占用的空间，也即，增加正负极活性材料占比，进而具有较高的能量密度。
图12为根据本申请一些实施例提供的电池单体的制造方法的示意性流程图。根据本申请的一些实施例，本申请提供了一种电池单体的制造方法，如图12所示，该电池单体的制造方法可以包括：
401，提供电极组件13，电极组件13包括本体131和极耳132，极耳132包括第一段1321、第二段1322以及连接于第一段1321和第二段1322之间的拐角段1323；
402，提供连接部件14，连接部件14包括端子连接部141和极耳连接部142，极耳连接部142具有朝向本体131的第一表面1421；
403，提供电极端子15；
404，将第二段1322固定于第一表面1421，折弯极耳132，使得沿本体131指向连接部件14的方向Z，拐角段1323超出第一表面1421；
405，将端子连接部141连接电极端子15。
需要指出的是，步骤“401，提供电极组件13”、步骤“402，提供连接部件14”及步骤“403，提供电极端子15”的顺序并不限定，在一些实施例中，可以依次按照步骤“402，提供连接部件14”、步骤“401，提供电极组件13”及步骤“403，提供电极端子15”的顺序进行，或者，也可以依次按照步骤“403，提供电极端子15”、步骤“401，提供电极组件13”及步骤“402，提供连接部件14”。
图13为根据本申请一些实施例提供的电池单体的制造设备500的示意性框图。根据本申请的一些实施例，本申请提供了一种电池单体的制造设备500，如图13所示，该电池单体的制造设备500包括提供模块501以及组装模块502。提供模块501用于提供电极组件13、提供连接部件14及提供电极端子15，电极组件13包括本体131和极耳132，极耳132包括第一段1321、第二段1322以及连接于第一段1321和第二段1322之间的拐角段1323，连接部件14包括端子连接部141和极耳连接部142，极耳连接部142具有朝向本体131的第一表面1421。组装模块502用于将第二段1322固定于第一表面1421，折弯极耳132，使得沿本体131指向连接部件14的方向Z，拐角段1323超出第一表面1421，并将端子连接部141连接电极端子15。
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. 一种电池单体，包括：
    电极组件，包括本体和极耳；
    连接部件，包括端子连接部和极耳连接部，所述端子连接部用于连接电极端子，所述极耳连接部用于连接所述极耳，所述极耳连接部具有朝向所述本体的第一表面；
    其中，所述极耳包括连接于所述本体的第一段、固定于所述第一表面的第二段以及连接于所述第一段和所述第二段之间的拐角段，沿所述本体指向所述连接部件的方向，所述拐角段超出所述第一表面。
  2. 根据权利要求1所述的电池单体，其中，沿所述本体指向所述连接部件的方向，所述拐角段超出所述极耳连接部的远离所述本体的第二表面。
  3. 根据权利要求1或2所述的电池单体，其中，所述拐角段与所述第二段之间的夹角为钝角。
  4. 根据权利要求1-3中任一项所述的电池单体，其中，所述电池单体还包括：
    壳体，具有容纳腔，至少部分所述连接部件和所述电极组件容纳于所述容纳腔内；
    所述连接部件还具有沿所述电极组件的厚度方向的端面，所述拐角段位于所述端面和所述壳体的内壁之间。
  5. 根据权利要求4所述的电池单体，其中，所述电池单体还包括：
    端盖，密封所述壳体；
    绝缘件，至少部分所述绝缘件设置于所述端盖和所述连接部件之间，用于隔离所述端盖和所述连接部件。
  6. 根据权利要求5所述的电池单体，其中，所述绝缘件的沿所述电极组件的厚度方向的边缘形成有朝向所述本体凸出的凸缘，所述凸缘位于所述拐角段和所述壳体之间。
  7. 根据权利要求6所述的电池单体，其中，所述极耳的厚度为A，所述端面与所述凸缘之间的距离为B，满足1％≤A/B≤20％。
  8. 根据权利要求5-7中任一项所述的电池单体，其中，所述拐角段与所述绝缘件的背离所述端盖的一侧抵接。
  9. 根据权利要求4-8中任一项所述的电池单体，其中，所述第一表面与所述端面的交汇处设置有圆角或弹性件。
  10. 根据权利要求1-8中任一项所述的电池单体，其中，所述端子连接部相对于所述极耳连接部朝向背离所述本体的一侧凸出。
  11. 一种电池，包括如权利要求1-10中任一项所述的电池单体。
  12. 一种用电设备，包括如权利要求1-10中任一项所述的电池单体，所述电池单体用于提供电能。
  13. 一种电池单体的制造方法，包括：
    提供电极组件，所述电极组件包括本体和极耳，所述极耳包括第一段、第二段以及连接于所述第一段和所述第二段之间的拐角段；
    提供连接部件，包括端子连接部和极耳连接部，所述极耳连接部具有朝向所述本体的第一表面；
    提供电极端子；
    将所述第二段固定于所述第一表面，折弯所述极耳，使得沿所述本体指向所述连接部件的方向，所述拐角段超出所述第一表面；
    将所述端子连接部连接所述电极端子。
  14. 一种电池单体的制造设备，包括：
    提供模块，用于提供电极组件、提供连接部件及提供电极端子，所述电极组件包括本体和极耳，所述极耳包括第一段、第二段以及连接于所述第一段和所述第二段之间的拐角段，所述连接部件包括端子连接部和极耳连接部，所述极耳连接部具有朝向所述本体的第一表面；
    组装模块，用于将所述第二段固定于所述第一表面，折弯所述极耳，使得沿所述本体指向所述连接部件的方向，所述拐角段超出所述第一表面，并将所述端子连接部连接所述电极端子。
PCT/CN2021/122378 2021-09-30 2021-09-30 电池单体、电池、用电设备及电池单体的制造方法和设备 WO2023050388A1 (zh)

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