WO2021179761A1 - 二次电池、电池模块以及使用二次电池作为电源的装置 - Google Patents

二次电池、电池模块以及使用二次电池作为电源的装置 Download PDF

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Publication number
WO2021179761A1
WO2021179761A1 PCT/CN2020/141780 CN2020141780W WO2021179761A1 WO 2021179761 A1 WO2021179761 A1 WO 2021179761A1 CN 2020141780 W CN2020141780 W CN 2020141780W WO 2021179761 A1 WO2021179761 A1 WO 2021179761A1
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WIPO (PCT)
Prior art keywords
secondary battery
main body
tab
connecting portion
top cover
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2020/141780
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English (en)
French (fr)
Inventor
许虎
陈元宝
许龙
董娇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
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 Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to EP20924689.1A priority Critical patent/EP4050724A4/en
Publication of WO2021179761A1 publication Critical patent/WO2021179761A1/zh
Priority to US17/826,466 priority patent/US12347890B2/en
Anticipated expiration legal-status Critical
Priority to US19/216,760 priority patent/US20250286242A1/en
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—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
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • 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
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/16—Organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • 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
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the 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
    • H01M50/547—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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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

  • This application relates to the field of batteries, and in particular to a secondary battery, a battery module, and a device using the secondary battery as a power source.
  • lithium ion batteries are widely used in electronic devices such as mobile phones and notebook computers due to their high energy density and environmental friendliness.
  • electronic devices such as mobile phones and notebook computers due to their high energy density and environmental friendliness.
  • the application of lithium-ion batteries has been rapidly expanded to gasoline-electric hybrid vehicles, ships, and energy storage systems.
  • the secondary battery includes an electrode assembly, a top cover assembly and a current collecting member.
  • the electrode assembly includes a main body and tabs extending from the main body.
  • the top cover assembly also includes a top cover plate, an insulating separator and an electrode terminal.
  • the current collecting member is connected to the tabs. And electrode terminals.
  • the insulating partition is connected between the top cover plate and the current collecting member, thereby reducing the hidden danger of the current collecting member contacting the top cover plate and causing a short circuit.
  • an insulating separator occupies the space inside the secondary battery and reduces the energy density of the secondary battery.
  • the purpose of this application is to provide a secondary battery, a battery module, and a device using the secondary battery as a power source, which can increase the energy density and reduce the risk of short circuit.
  • a secondary battery which includes an electrode assembly, a top cover assembly, and a current collecting member.
  • the electrode assembly includes a main body and tabs extending from the main body.
  • the top cover assembly includes a top cover plate, an electrode terminal and an insulating partition plate.
  • the electrode terminals are arranged on the top cover plate, and the insulating partition plate is connected to a side of the top cover plate close to the main body.
  • the current collecting member is at least partially located between the insulating partition and the main body, and the current collecting member includes a tab connecting portion connected to the tab.
  • the insulating partition has a first recess, and the first recess is recessed in a direction away from the main body with respect to the lower surface of the insulating partition, and the tab connecting part is at least partially accommodated in the first recess.
  • the current collecting member further includes a terminal connection part connected to the electrode terminal, the terminal connection part and the tab connection part are both flat plate structures, and the tab connection part is compared with the terminal connection part. The part is farther away from the main body.
  • the tab is connected to a side of the tab connection part close to the main body.
  • the current collecting member further includes an inclined portion connected between the terminal connection portion and the tab connection portion, and the inclined portion is inclined in a direction away from the main body with respect to the terminal connection portion.
  • the terminal connection part is parallel to the tab connection part.
  • the terminal connection portion includes a fixed area and a fusion area, the fixed area is connected to the electrode terminal, and the fusion area is connected between the fixed area and the inclined portion.
  • the current collecting member further includes an insulating block coated on the outside of the fusing zone. A part of the insulating block is contained in the first recess, and the surface of the insulating block away from the main body is closer to the main body than the surface of the tab connecting portion away from the main body.
  • the present application also provides a battery module, which includes the secondary battery as described above, and there are a plurality of secondary batteries.
  • the present application also provides a device using a secondary battery as a power source, which includes the secondary battery as described above.
  • the beneficial effects of this application are as follows.
  • the volume of the insulating separator is reduced, the space occupied by the insulating separator in the secondary battery is reduced, and the energy density of the secondary battery is improved.
  • the tab connecting portion is at least partially accommodated in the first recess, which can increase the distance between the tab connecting portion and the main body, provide more space for the tab, reduce the risk of the tab inserted into the main body, avoid short circuits, and improve safety performance.
  • Fig. 1 is a schematic diagram of a device using a secondary battery as a power source in some embodiments.
  • Figure 2 is a schematic diagram of a battery module in some embodiments.
  • FIG. 3 is a schematic diagram of a secondary battery according to some embodiments.
  • Fig. 4 is an exploded view of the secondary battery of Fig. 3.
  • FIG. 5 is a cross-sectional view of an electrode assembly of a secondary battery according to some embodiments.
  • FIG. 6 is a top view of a secondary battery according to some embodiments.
  • Fig. 7 is a cross-sectional view of the secondary battery of Fig. 6 taken along line A-A.
  • Fig. 8 is an enlarged view of Fig. 7 in the box part.
  • Fig. 9 is a cross-sectional view of the secondary battery of Fig. 6 taken along line B-B.
  • Fig. 10 is an enlarged view of Fig. 9 in the block part.
  • Figure 11 is a schematic diagram of a top cover assembly and a current collecting member according to some embodiments.
  • Figure 12 is a schematic diagram of an insulating spacer according to some embodiments.
  • Figure 13 is another schematic view of an insulating spacer according to some embodiments.
  • Figure 14 is a schematic diagram of a current collecting member according to some embodiments.
  • Fig. 15 is a schematic diagram of a current collecting member according to other embodiments.
  • Fig. 16 is a schematic diagram of a current collecting member according to still other embodiments.
  • the present application provides a device that uses a secondary battery as a power source, and the device is an electric vehicle, a hybrid electric vehicle, or a ship.
  • the device is an electric vehicle, which is a pure electric vehicle, or a hybrid vehicle or a range-extended vehicle.
  • An electric vehicle includes a chassis, a body, and an electric drive system.
  • the electric drive system includes a drive module and a power module.
  • the drive module includes structures such as a motor, a mechanical transmission device, and wheels.
  • the power module includes multiple secondary batteries. The power module drives the wheels to rotate through the motor and mechanical transmission, thereby driving the electric vehicle to move.
  • the secondary battery is a lead-acid battery, a nickel-cadmium battery, a nickel-hydrogen battery or a lithium-ion battery. In some optional embodiments, the secondary battery is a lithium ion battery.
  • the battery module includes a plurality of secondary batteries 1000.
  • a plurality of secondary batteries 1000 are arranged in sequence.
  • the battery module also includes two end plates and two side plates. The two end plates are respectively located at both ends of the plurality of secondary batteries 1000 in the arrangement direction, and the two side plates are respectively located on both sides of the plurality of secondary batteries 1000.
  • the two end plates and the two side plates are connected together to form an approximately rectangular frame structure, and the frame structure supports and fixes a plurality of secondary batteries 1000.
  • the application also provides a secondary battery.
  • the secondary battery includes an electrode assembly 1, a case 2, a top cover assembly 3, and a current collecting member 4.
  • the electrode assembly 1 is the core component of the secondary battery to realize the charge and discharge function.
  • the electrode assembly 1 includes a positive pole piece 13, a negative pole piece 14, and a separator 15 separating the positive pole piece 13 and the negative pole piece 14.
  • the positive pole piece 13, the separator 15 and the negative pole piece 14 are sequentially stacked and wound into one body.
  • the positive pole pieces 13 and the negative pole pieces 14 are both sheet-like structures and alternately stacked along the thickness direction thereof.
  • the positive pole piece 13 includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector.
  • the positive electrode current collector has a positive electrode coating area and a positive electrode blank area. The positive electrode coating area is covered by the positive electrode active material layer, and the positive electrode blank area is not Covered by the positive electrode active material layer.
  • the negative electrode piece 14 includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector.
  • the negative electrode current collector has a negative electrode coating area and a negative electrode blank area. The negative electrode coating area is covered by the negative electrode active material layer. Covered by the negative electrode active material layer.
  • the positive electrode current collector is aluminum foil, and the positive electrode active material layer includes lithium manganate, lithium iron phosphate, or a ternary material.
  • the negative electrode current collector is copper foil, and the negative electrode active material layer includes graphite or silicon.
  • the electrode assembly 1 includes a main body 11 and tabs 12 extending from the main body 11.
  • the main body 11 includes a positive electrode coating area, a positive electrode active material layer, a negative electrode coating area, a negative electrode active material layer, and a separator 15.
  • tabs 12 which are a positive pole and a negative pole; the positive pole includes a plurality of positive blank areas stacked together, and the negative pole includes a plurality of negative blank areas stacked together.
  • the housing 2 has a hexahedral shape. In some other embodiments, the housing 2 has a cylindrical shape or other shapes. A cavity is formed inside the case 2 to contain the electrode assembly 1 and the electrolyte. The case 2 is formed with an opening at one end, and the electrode assembly 1 can be placed into the inner cavity of the case 2 through the opening. In some embodiments, the housing 2 is made of conductive metal materials such as aluminum or aluminum alloy.
  • the top cover assembly 3 includes a top cover plate 31 and electrode terminals 32 arranged on the top cover plate 31, and the size of the top cover plate 31 is adapted to the size of the opening of the housing 2.
  • the top cover plate 31 is a conductive metal plate.
  • the top cover plate 31 is connected to the housing 2 by welding and covers the opening of the housing 2.
  • the top cover plate 31 is provided with a penetrating electrode extraction hole, and the electrode extraction hole is used to lead the electric energy of the electrode assembly 1 located inside the housing 2 to the outside of the top cover plate 31.
  • the electrode terminal 32 passes through the electrode extraction hole of the top cover plate 31 and is exposed to the outside of the secondary battery.
  • Electrode terminals 32 There are two electrode terminals 32, namely a positive terminal and a negative terminal.
  • the positive terminal is electrically connected to the positive electrode tab, and the negative terminal is electrically connected to the negative electrode terminal.
  • the top cover plate 31 has a through hole 311.
  • the top cover assembly 3 further includes an explosion-proof disk 34, and the explosion-proof disk 34 is arranged on the top cover plate 31 and seals the exhaust hole 311.
  • the rupture disk 34 has a weak area. When the electrode assembly 1 generates a large amount of gas due to overcharging, short circuit, etc., the air pressure inside the secondary battery increases and breaks through the rupture disk 34 in the weak area. The gas is discharged to the second through the exhaust hole 311. The outside of the secondary battery, so as to prevent the secondary battery from exploding.
  • the secondary battery further includes a current collecting member 4, two current collecting members 4; one current collecting member 4 connects the positive terminal and the positive electrode tab, and the other current collecting member 4 connects the negative terminal and the negative electrode tab.
  • the top cover assembly 3 further includes an insulating partition 33, which is disposed on a side of the top cover plate 31 close to the main body 11. Side and connected to the top cover 31.
  • the current collecting member 4 is at least partially located between the insulating partition 33 and the main body 11.
  • the insulating partition 33 can separate the current collecting member 4 and the top cover plate 31, thereby avoiding direct contact between the current collecting member 4 and the top cover plate 31, and reducing the risk of short circuit.
  • the current collecting member 4 includes a terminal connecting portion 41 and a tab connecting portion 42.
  • the terminal connecting portion 41 is connected to the electrode terminal 32, and the tab connecting portion 42 is connected to the electrode. Ear 12.
  • the tab connecting portion 42 is connected to the tab 12 by welding or the like, and the terminal connecting portion 41 is connected to the electrode terminal 32 by welding or the like.
  • the insulating spacer 33 has a first recess 332, and the first recess 332 is recessed in a direction away from the main body 11 with respect to the lower surface 331 of the insulating spacer 33.
  • the lower surface 331 of the insulating partition 33 faces the main body 11 and is generally flat.
  • the tab connecting portion 42 is at least partially received in the first recess 332.
  • the volume of the insulating separator 33 can be reduced, the space occupied by the insulating separator 33 in the secondary battery can be reduced, and the energy density of the secondary battery can be improved.
  • the tab connecting portion 42 is at least partially accommodated in the first recess 332, which can increase the distance between the tab connecting portion 42 and the main body 11, provide more space for the tab 12, reduce the risk of the tab 12 being inserted into the main body 11, and avoid Short circuit to improve safety performance.
  • the tab 12 includes a first portion 121 and a second portion 122.
  • the first portion 121 extends from the main body 11, and the second portion 122 is connected to an end of the first portion 121 away from the main body 11 and opposite to the first portion. 121 is bent, and the second part 122 is welded to the tab connecting portion 42. The end of the second part 122 away from the first part 121 may be bent downwards. If the distance between the tab connecting part 42 and the main body 11 is too small, the end of the second part 122 may be inserted into the main body 11, causing a short circuit. risk.
  • the distance between the tab connecting portion 42 and the main body 11 can be increased, and the distance between the second portion 122 and the main body 11 can be increased, thereby reducing the insertion of the second portion 122 into the main body 11 risks of.
  • the terminal connecting portion 41 and the tab connecting portion 42 are both flat plate structures. 8
  • the electrode terminal 32 is located on the side of the terminal connection portion 41 away from the main body 11, and does not need to be connected to the tab 12. Therefore, compared to the tab connection portion 42, the terminal connection portion 41 and the main body 11 may have Smaller distance; in other words, the tab connecting portion 42 is farther away from the main body 11 than the terminal connecting portion 41.
  • the tab 12 is connected to the side of the tab connecting portion 42 close to the main body 11 to simplify the welding process of the tab 12 and the tab connecting portion 42 and the terminal connecting portion 41 and the electrode terminal 32 welding process.
  • the tab 12 is connected to the side of the tab connecting portion 42 far away from the main body 11, in order to accommodate the tab connecting portion 42, the first recess 332 needs to have a greater depth, which will reduce the insulation barrier 33. Insulation performance.
  • the tab connecting portion 42 is attached to the bottom surface of the first recess 332, when assembling the current collecting member 4 and the top cover assembly 3, the current collecting member 4 needs to be attached to the bottom surface of the electrode terminal 32 and the bottom surface of the first recess 332 at the same time.
  • the bottom surface due to the existence of process errors, it is difficult to ensure that the current collecting member 4 is completely attached to the two bottom surfaces.
  • a gap is reserved between the tab connecting portion 42 and the bottom surface of the first recess 332, and it is only necessary to ensure that the current collecting member 4 is attached to the bottom surface of the electrode terminal 32.
  • the tab connecting portion 42 can release the stress between the tab 12 and the current collecting member 4 through elastic deformation, reducing the risk of the tab 12 tearing.
  • the current collecting member 4 further includes an inclined portion 43 connected between the terminal connecting portion 41 and the tab connecting portion 42, and the inclined portion 43 is opposite to The terminal connection portion 41 is inclined in a direction away from the main body 11. By providing the inclined portion 43, the distance between the tab connecting portion 42 and the main body 11 is increased.
  • the terminal connecting portion 41 is parallel to the tab connecting portion 42. Both the terminal connection portion 41 and the tab connection portion 42 are substantially perpendicular to the height direction Z of the secondary battery.
  • the terminal connecting portion 41 includes a fixed area 411 and a fusing area 412, the fixed area 411 is connected to the electrode terminal 32, and the fusing area 412 is connected between the fixed area 411 and the inclined portion 43.
  • the fusing area 412 is set to be fused to cut off the circuit when the secondary battery is short-circuited.
  • the overcurrent area of the fuse area 412 is smaller; when the secondary battery is short-circuited, the circuit on the current collecting member 4 increases sharply, and when a large current passes through the fuse area 412, heat is generated and causes The fuse zone is disconnected, thereby cutting off the circuit and reducing safety risks such as fire and explosion of the secondary battery.
  • the terminal connecting portion 41 is provided with a through hole, and the fuse zone 412 includes two sub-fuse zones, and the two sub-fuse zones are respectively located on both sides of the through hole.
  • the terminal connecting portion 41 is provided with a groove, and the fusing area 412 is located on one side of the groove along the thickness direction of the terminal connecting portion 41.
  • the terminal connecting portion 41 is provided with two notches, and the two notches are respectively located on both sides of the fusing area 412.
  • the current collecting member 4 further includes an insulating block 44 covering the outside of the fusing zone 412.
  • the insulating block 44 can connect the separated two parts to avoid relative movement of the separated two parts and prevent the two parts of the current collecting member 4 from overlapping again.
  • a part of the insulating block 44 is inserted into the through hole of the terminal connection part 41 and separates the fixing area 411 and the inclined part 43.
  • a part of the insulating block 44 is received in the first recess 332.
  • the projection of the insulating block 44 is located in the projection of the peripheral wall of the first recess 332.
  • a part of the insulating block 44 is received in the first recess 332, so that the first recess 332 can be fully utilized, space is saved, and the energy density of the secondary battery is improved.
  • the surface of the insulating block 44 away from the main body 11 is closer to the main body 11 than the surface of the tab connecting portion 42 away from the main body 11. If the surface of the insulating block 44 away from the main body 11 is farther away from the main body 11 than the surface of the tab connecting portion 42 away from the main body 11, in order to be able to accommodate the insulating block 44, the depth of the first recess 332 needs to be increased, thereby reducing the insulating spacer 33 Insulation performance.
  • the insulating spacer 33 further has a first protrusion 333 protruding from the lower surface 331, and the terminal connecting portion 41 is located on the side of the first protrusion 333 close to the main body 11.
  • the inclined portion 43 is located on one side of the first convex portion 333 along the length direction X of the secondary battery.
  • the insulating partition 33 has an upper surface 334 facing the top cover plate 31 and a second recess 335 recessed relative to the upper surface 334.
  • the projection of the rupture disk 34 is located in the projection of the boundary of the second recess 335. 8 by providing the second recess 335, the distance between the rupture disk 34 and the insulating partition 33 can be reduced, and the insulating partition 33 is prevented from squeezing the rupture disk 34 when deformed, and the rupture disk 34 is prevented from being crushed by the insulating partition 33.
  • the first concave portion 332 and the second concave portion 335 do not overlap, which can ensure the depth of the first concave portion 332 and the depth of the second concave portion 335 while avoiding the first concave portion 332 and the second concave portion 335 connected.
  • the insulating partition 33 further includes a second convex portion 336, and the second convex portion 336 protrudes relative to the first convex portion 333 along the direction approaching the main body 11.
  • the second protrusion 336 abuts on the main body 11 to reduce the vibration of the main body 11 and reduce the risk of tearing of the tab 12.

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Abstract

本申请提供了一种二次电池、电池模块以及使用二次电池作为电源的装置。二次电池包括电极组件、顶盖组件和集流构件。所述电极组件包括主体和从所述主体延伸出的极耳。所述顶盖组件包括顶盖板、电极端子和绝缘隔板，所述电极端子设置于所述顶盖板，所述绝缘隔板连接于所述顶盖板的靠近所述主体的一侧。所述集流构件至少部分位于所述绝缘隔板与所述主体之间，所述集流构件包括连接于所述极耳的极耳连接部。所述绝缘隔板具有第一凹部，所述第一凹部相对于所述绝缘隔板的下表面朝远离所述主体的方向凹陷，所述极耳连接部至少部分收容于所述第一凹部。

Description

二次电池、电池模块以及使用二次电池作为电源的装置
相关申请的交叉引用
本申请要求享有于2020年03月12日提交的名称为“二次电池、电池模块以及使用二次电池作为电源的装置”的中国专利申请202020306566.8的优先权，该申请的全部内容通过引用并入本申请中。
技术领域
本申请涉及电池领域，尤其涉及一种二次电池、电池模块以及使用二次电池作为电源的装置。
背景技术
二次电池如锂离子电池由于能量密度高，环境友好等优点被广泛应用于移动电话、笔记本电脑等电子装置。近年来，为了应对环境问题，汽油价格问题，以及能量存储问题，锂离子电池的应用已经快速扩展到油电混动车辆、轮船以及能量存储系统等。
二次电池包括电极组件、顶盖组件和集流构件，电极组件包括主体和从主体延伸出的极耳，顶盖组件还包括顶盖板、绝缘隔板和电极端子，集流构件连接极耳和电极端子。而绝缘隔板连接于顶盖板和集流构件之间，从而减小集流构件与顶盖板接触且引发短路的隐患。
然而，设置绝缘隔板会占用二次电池内部的空间，减小二次电池的能量密度。
发明内容
鉴于背景技术中存在的问题，本申请的目的在于提供一种二次电池、电池模块以及使用二次电池作为电源的装置，其能提高能量密度，降低短路风险。
为了实现上述目的，本申请提供了一种二次电池，其包括电极组件、顶盖组件和集流构件。电极组件包括主体和从主体延伸出的极耳。顶盖组件包括顶盖板、电极端子和绝缘隔板，电极端子设置于顶盖板，绝缘隔板连接于顶盖板的靠近主体的一侧。集流构件至少部分位于绝缘隔板与主体之间，集流构件包括连接于极耳的极耳连接部。绝缘隔板具有第一凹部，第一凹部相对于绝缘隔板的下表面朝远离主体的方向凹陷，极耳连接部至少部分收容于第一凹部。
在根据一些实施例的二次电池中，集流构件还包括端子连接部，端子连接部连接于电极端子，端子连接部和极耳连接部均为平板结构，且极耳连接部相比端子连接部更远离主体。
在根据一些实施例的二次电池中，极耳连接于极耳连接部的靠近主体的一侧。
在根据一些实施例的二次电池中，极耳连接部与第一凹部的底面之间具有间隙。
在根据一些实施例的二次电池中，集流构件还包括倾斜部，倾斜部连接于端子连接部和极耳连接部之间，且倾斜部相对于端子连接部朝远离主体的方向倾斜。
在根据一些实施例的二次电池中，端子连接部平行于极耳连接部。
在根据一些实施例的二次电池中，端子连接部包括固定区和熔断区，固定区连接于电极端子，熔断区连接于固定区和倾斜部之间。
在根据一些实施例的二次电池中，集流构件还包括绝缘块，包覆在熔断区的外侧。绝缘块的一部分收容于第一凹部内，绝缘块远离主体的表 面相比极耳连接部远离主体的表面更靠近主体。
本申请还提供了一种电池模块，其包括如上所述的二次电池，二次电池为多个。
本申请还提供了一种使用二次电池作为电源的装置，其包括如上所述的二次电池。
本申请的有益效果如下。本申请通过设置第一凹部，减小绝缘隔板的体积，降低绝缘隔板在二次电池内占用的空间，提高二次电池的能量密度。极耳连接部至少部分收容于第一凹部，这样能够增大极耳连接部和主体的距离，为极耳提供更多的空间，降低极耳插入主体的风险，避免短路，提高安全性能。
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为使用二次电池作为电源的装置在一些实施例中的示意图。
图2为电池模块在一些实施例中的示意图。
图3为根据一些实施例的二次电池的示意图。
图4为图3的二次电池的分解图。
图5为根据一些实施例的二次电池的电极组件的断面图。
图6为根据一些实施例的二次电池的俯视图。
图7为图6的二次电池沿线A-A作出的剖视图。
图8为图7在方框部分的放大图。
图9为图6的二次电池沿线B-B作出的剖视图。
图10为图9在方框部分的放大图。
图11为根据一些实施例的顶盖组件和集流构件的示意图。
图12为根据一些实施例的绝缘隔板的一示意图。
图13为根据一些实施例的绝缘隔板的另一示意图。
图14为根据一些实施例的集流构件的示意图。
图15为根据另一些实施例的集流构件的示意图。
图16为根据又一些实施例的集流构件的示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
1：电极组件；
11：主体；
12：极耳；
121：第一部分；
122：第二部分；
13：正极极片；
14：负极极片；
15：隔膜；
2：壳体；
3：顶盖组件；
31：顶盖板；
311：排气孔；
32：电极端子；
33：绝缘隔板；
331：下表面；
332：第一凹部；
333：第一凸部；
334：上表面；
335：第二凹部；
336：第二凸部；
34：防爆片；
4：集流构件；
41：端子连接部；
411：固定区；
412：熔断区；
413：熔断孔；
42：极耳连接部；
421：子连接部；
422：集合部；
43：倾斜部；
44：绝缘块；
1000：二次电池；
X：长度方向；
Y：厚度方向；
Z：高度方向。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位 置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
本申请提供了一种使用二次电池作为电源的装置，所述装置为电动车辆、混合动力电动车辆或轮船等。参照图1，在一些实施例中，所述装置为电动车辆，电动车辆为纯电动汽车，也可以混合动力汽车或增程式汽车。电动车辆包括底盘、车身和电力驱动系统，电力驱动系统包括驱动模块和电源模块，驱动模块包括电机、机械传动装置以及车轮等结构，电源模块包括多个二次电池。电源模块通过电机和机械传动装置驱动车轮转动，从而带动电动车辆移动。二次电池为铅酸电池、镍镉电池、镍氢电池或锂离子电池。在一些可选的实施例中，二次电池为锂离子电池。
本申请还提供了一种电池模块，参照图2，电池模块包括多个二次电池1000。在一些实施例中，多个二次电池1000依次排列。电池模块还包括两个端板和两个侧板，两个端板分别位于多个二次电池1000沿排列方向的两端，两个侧板分别位于多个二次电池1000的两侧，两个端板和两个侧板连接在一起并组成近似矩形的框架结构，框架结构支撑和固定多个二次电池1000。
本申请还提供了一种二次电池。参照图3和图4，根据一些实施例的二次电池包括电极组件1、壳体2、顶盖组件3和集流构件4。
电极组件1为二次电池实现充放电功能的核心构件。电极组件1包 括正极极片13、负极极片14以及将正极极片13和负极极片14隔开的隔膜15。在一些实施例中，参照图5，正极极片13、隔膜15和负极极片14依次层叠并卷绕为一体。在另一些实施例中，正极极片13和负极极片14均为片状结构并沿其厚度方向交替层叠。
正极极片13包括正极集流体和涂覆于正极集流体表面的正极活性物质层，正极集流体具有正极涂覆区域和正极空白区域，正极涂覆区域被正极活性物质层覆盖，正极空白区域未被正极活性物质层覆盖。负极极片14包括负极集流体和涂覆于负极集流体表面的负极活性物质层，负极集流体具有负极涂覆区域和负极空白区域，负极涂覆区域被负极活性物质层覆盖，负极空白区域未被负极活性物质层覆盖。
在一些实施例中，正极集流体为铝箔，正极活性物质层包括锰酸锂、磷酸铁锂或三元材料。负极集流体为铜箔，负极活性物质层包括石墨或硅。
参照图4，从电极组件1的外形来看，电极组件1包括主体11和从主体11延伸出的极耳12。主体11包括正极涂覆区域、正极活性物质层、负极涂覆区域、负极活性物质层和隔膜15。极耳12为两个，分别为正极极耳和负极极耳；正极极耳包括多个层叠在一起的正极空白区域，负极极耳包括多个层叠在一起的负极空白区域。
在一些实施例中，参照图4，壳体2具有六面体形状。在另外的一些实施例中，壳体2具有圆柱形或其他形状。壳体2内部形成空腔，以容纳电极组件1和电解液。壳体2在一端形成开口，而电极组件1可经由开口放置到壳体2的内腔。在一些实施例中，壳体2由铝或铝合金等导电金属的材料制成。
顶盖组件3包括顶盖板31和设置于顶盖板31的电极端子32，顶盖板31的尺寸与壳体2的开口的尺寸相适配。在一些实施例中，顶盖板31为导电金属板。顶盖板31通过焊接连接到壳体2并覆盖壳体2的开口。顶盖板31设置有贯通的电极引出孔，电极引出孔用于将位于壳体2内部的电极组件1的电能引出到顶盖板31的外部。在一些实施例中，电极端子32穿过顶盖板31的电极引出孔并露出到二次电池的外部。
电极端子32为两个，分别为正极端子和负极端子，正极端子电连接于正极极耳，负极端子电连接于负极极耳。
在一些实施例中，顶盖板31具有贯通的排气孔311。顶盖组件3还包括防爆片34，防爆片34设置于顶盖板31并密封排气孔311。防爆片34具有薄弱区域，当电极组件1由于过度充电、短路等原因而产生大量气体时，二次电池内部的气压增大并在薄弱区域冲破防爆片34，气体经由排气孔311排出到二次电池的外部，从而避免二次电池爆炸。
根据一些实施例的二次电池还包括集流构件4，集流构件4为两个；一个集流构件4连接正极端子和正极极耳，另一个集流构件4连接负极端子和负极极耳。
为避免顶盖板31将正负极耳导通，降低短路风险，根据一些实施例的顶盖组件3还包括绝缘隔板33，绝缘隔板33设置于顶盖板31的靠近主体11的一侧并连接于顶盖板31。
集流构件4至少部分位于绝缘隔板33与主体11之间。绝缘隔板33能够将集流构件4和顶盖板31隔开，从而避免集流构件4和顶盖板31直接接触，降低短路风险。
在一些实施例中，参照图8、图14至图16，集流构件4包括端子连接部41和极耳连接部42，端子连接部41连接于电极端子32，极耳连接部42连接于极耳12。极耳连接部42通过焊接等方式连接到极耳12，端子连接部41通过焊接等方式连接到电极端子32。
参照图7至图12，绝缘隔板33具有第一凹部332，第一凹部332相对于绝缘隔板33的下表面331朝远离主体11的方向凹陷。绝缘隔板33的下表面331面向主体11且大体为平面。极耳连接部42至少部分收容于第一凹部332。
在本申请中，通过设置第一凹部332，可以减小绝缘隔板33的体积，降低绝缘隔板33在二次电池内占用的空间，提高二次电池的能量密度。极耳连接部42至少部分收容于第一凹部332，这样能够增大极耳连接部42和主体11的距离，为极耳12提供更多的空间，降低极耳12插入主体11的风险，避免短路，提高安全性能。
参照图10，根据一些实施例的极耳12包括第一部分121和第二部分122，第一部分121从主体11延伸，第二部分122连接于第一部分121的远离主体11的一端并相对于第一部分121弯折，且第二部分122焊接于极耳连接部42。第二部分122的远离第一部分121的端部可能向下弯曲，如果极耳连接部42与主体11之间的距离过小，那么第二部分122的端部可能会插入主体11，从而引发短路风险。而本申请通过设置第一凹部332，可以增大极耳连接部42与主体11之间的距离，也就能够增大第二部分122和主体11的间距，从而降低第二部分122插入主体11的风险。
在一些实施例中，参照图14至图16，端子连接部41和极耳连接部42均为平板结构。参照图8，电极端子32位于端子连接部41的远离主体11的一侧，且无需与极耳12连接，因此，相比于极耳连接部42，端子连接部41与主体11之间可具有较小的距离；换句话说，极耳连接部42相比端子连接部41更远离主体11。
在一些实施例中，参照图10，极耳12连接于极耳连接部42的靠近主体11的一侧，以简化极耳12和极耳连接部42的焊接工艺和端子连接部41和电极端子32的焊接工艺。另外，如果极耳12连接于极耳连接部42的远离主体11的一侧，那么为了收容极耳连接部42，那么第一凹部332需要具有较大的深度，这会降低绝缘隔板33的绝缘性能。
在一些实施例中，参照图10，极耳连接部42与第一凹部332的底面之间具有间隙。通过设置间隙，可以简化集流构件4和顶盖组件3的装配。如果极耳连接部42与第一凹部332的底面贴合，那么在装配集流构件4和顶盖组件3时，集流构件4需要同时贴合于电极端子32的底面和第一凹部332的底面；由于工艺误差的存在，难以保证集流构件4与两个底面完全贴合。因此，本申请在极耳连接部42与第一凹部332的底面之间预留间隙，只需保证集流构件4与电极端子32的底面贴合即可。另外，当二次电池震动时，极耳连接部42可以通过弹性变形释放极耳12和集流构件4之间的应力，降低极耳12撕裂的风险。
在一些实施例中，参照图8、图14至图16，集流构件4还包括倾斜部43，倾斜部43连接于端子连接部41和极耳连接部42之间，且倾斜 部43相对于端子连接部41朝远离主体11的方向倾斜。通过设置倾斜部43，增大极耳连接部42和主体11的间距。
在一些实施例中，端子连接部41平行于极耳连接部42。端子连接部41和极耳连接部42均大体垂直于二次电池的高度方向Z。
在一些实施例中，参照图15，端子连接部41包括固定区411和熔断区412，固定区411连接于电极端子32，熔断区412连接于固定区411和倾斜部43之间。熔断区412设置为：当二次电池短路时，熔断区412熔断，以切断电路。与集流构件4的其它部分相比，熔断区412的过流面积较小；当二次电池短路时，集流构件4上的电路急剧增大，大电流通过熔断区412时产热并使熔断区断开，从而切断电路，降低二次电池起火、爆炸等安全风险。
在一些实施例中，参照图15，端子连接部41设有通孔，熔断区412包括两个子熔断区，两个子熔断区分别位于通孔两侧。在另一些实施例中，端子连接部41设有凹槽，熔断区412位于凹槽沿端子连接部41的厚度方向的一侧。在又一些实施例中，端子连接部41设有两个缺口，两个缺口分别位于熔断区412的两侧。通过设置通孔、凹槽或缺口，本申请能够减小熔断区412的过流面积，从而实现熔断区412的安全保护功能。
在一些实施例中，参照图16，集流构件4还包括绝缘块44，包覆在熔断区412的外侧。当熔断区412熔断时，集流构件4分离为两部分，而绝缘块44能够将分离的两部分连接，避免分离的两部分相对移动，防止集流构件4的两部分再次搭接。在一些实施例中，绝缘块44的一部分插入端子连接部41的通孔中，并将固定区411和倾斜部43隔开。
在一些实施例中，绝缘块44的一部分收容于第一凹部332。在垂直于端子连接部41的厚度方向的平面内，绝缘块44的投影位于第一凹部332的周壁的投影内。绝缘块44的一部分收容于第一凹部332，这样可以充分利用第一凹部332，节省空间，提高二次电池的能量密度。
在一些实施例中，绝缘块44远离主体11的表面相比极耳连接部42远离主体11的表面更靠近主体11。如果绝缘块44远离主体11的表面相比极耳连接部42远离主体11的表面更远离主体11，为了能够收容绝缘 块44，第一凹部332的深度需要增大，从而降低绝缘隔板33的绝缘性能。
在一些实施例中，参照图11和图12，绝缘隔板33还具有相对于下表面331凸出的第一凸部333，端子连接部41位于第一凸部333的靠近主体11的一侧，倾斜部43位于第一凸部333的沿二次电池的长度方向X的一侧。通过设置第一凸部333，可以增大端子连接部41和极耳连接部42在二次电池的高度方向Z上的高度差，降低极耳12搭接到端子连接部41的风险，避免熔断区412的安全保护功能失效。
在一些实施例中，参照图13，绝缘隔板33具有面向顶盖板31的上表面334和相对于上表面334凹陷的第二凹部335。在垂直于绝缘隔板33的厚度方向的平面内，防爆片34的投影位于第二凹部335的边界的投影内。参照图8，通过设置第二凹部335，可以减小防爆片34和绝缘隔板33的间距，避免绝缘隔板33在变形时挤压防爆片34，防止防爆片34被绝缘隔板33压破。
沿绝缘隔板33的厚度方向，第一凹部332和第二凹部335不重叠，这样可以在保证第一凹部332的深度和第二凹部335的深度的同时，避免第一凹部332和第二凹部335连通。
在一些实施例中，参照图8、图11至图13，绝缘隔板33还包括第二凸部336，沿靠近主体11的方向，第二凸部336相对于第一凸部333凸出。第二凸部336抵靠在主体11上，以减小主体11的震动，降低极耳12撕裂的风险。在可选的实施例中，第二凸部336为多个。
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 (10)

  1. 一种二次电池，包括：
    电极组件(1)，所述电极组件(1)包括主体(11)和从所述主体(11)延伸出的极耳(12)；
    顶盖组件(3)，所述顶盖组件(3)包括顶盖板(31)、电极端子(32)和绝缘隔板(33)，所述电极端子(32)设置于所述顶盖板(31)，所述绝缘隔板(33)连接于所述顶盖板(31)的靠近所述主体(11)的一侧；
    集流构件(4)，所述集流构件(4)至少部分位于所述绝缘隔板(33)与所述主体(11)之间，所述集流构件(4)包括连接于所述极耳(12)的极耳连接部(42)；
    所述绝缘隔板(33)具有第一凹部(332)，所述第一凹部(332)相对于所述绝缘隔板(33)的下表面(331)朝远离所述主体(11)的方向凹陷，所述极耳连接部(42)至少部分收容于所述第一凹部(332)。
  2. 根据权利要求1所述的二次电池，其中，所述集流构件(4)还包括端子连接部(41)，所述端子连接部(41)连接于所述电极端子(32)，所述端子连接部(41)和所述极耳连接部(42)均为平板结构，且所述极耳连接部(42)相比所述端子连接部(41)更远离所述主体(11)。
  3. 根据权利要求1或2所述的二次电池，其中，所述极耳(12)连接于所述极耳连接部(42)的靠近所述主体(11)的一侧。
  4. 根据权利要求1-3中任一项所述的二次电池，其中，所述极耳连接部(42)与所述第一凹部(332)的底面之间具有间隙。
  5. 根据权利要求2-4中任一项所述的二次电池，其中，
    所述集流构件(4)还包括倾斜部(43)，所述倾斜部(43)连接于所述端子连接部(41)和所述极耳连接部(42)之间，且所述倾斜部(43)相对于所述端子连接部(41)朝远离所述主体(11)的方向倾斜。
  6. 根据权利要求2-5中任一项所述的二次电池，其中，所述端子连接部(41)平行于所述极耳连接部(42)。
  7. 根据权利要求5所述的二次电池，其中，
    所述端子连接部(41)包括固定区(411)和熔断区(412)，所述固定区(411)连接于所述电极端子(32)，所述熔断区(412)连接于所述固定区(411)和倾斜部(43)之间。
  8. 根据权利要求7所述的二次电池，其中，所述集流构件(4)还包括绝缘块(44)，包覆在所述熔断区(412)的外侧；
    所述绝缘块(44)的一部分收容于第一凹部(332)内，所述绝缘块(44)远离所述主体(11)的表面相比所述极耳连接部(42)远离所述主体(11)的表面更靠近所述主体(11)。
  9. 一种电池模块，包括如权利要求1-8中任一项所述的二次电池，所述二次电池为多个。
  10. 一种使用二次电池作为电源的装置，包括权利要求1-8中任一项所述的二次电池。
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