WO2022001660A1 - 电芯引出片、电池及电动汽车 - Google Patents

电芯引出片、电池及电动汽车 Download PDF

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Publication number
WO2022001660A1
WO2022001660A1 PCT/CN2021/100333 CN2021100333W WO2022001660A1 WO 2022001660 A1 WO2022001660 A1 WO 2022001660A1 CN 2021100333 W CN2021100333 W CN 2021100333W WO 2022001660 A1 WO2022001660 A1 WO 2022001660A1
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WIPO (PCT)
Prior art keywords
cell lead
out sheet
battery
sheet according
branches
Prior art date
Application number
PCT/CN2021/100333
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English (en)
French (fr)
Inventor
柯文瑜
张�焕
许士安
周贵树
王际超
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to JP2022581394A priority Critical patent/JP2023532716A/ja
Priority to KR1020237003056A priority patent/KR20230028527A/ko
Priority to EP21831959.8A priority patent/EP4175048A1/en
Publication of WO2022001660A1 publication Critical patent/WO2022001660A1/zh
Priority to US18/083,931 priority patent/US20230119288A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/21—Bonding by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/64—Constructional details of batteries specially adapted for electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • 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
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides 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
    • H01M50/547—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
    • H01M50/584—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/36—Electric or electronic devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present application relates to the field of electric vehicles, and in particular, to cell lead-out sheets, batteries and electric vehicles.
  • HEV Hybrid Electric Vehicle
  • mHEV Movable Hybrid Electric Vehicle
  • HEV/mHEV batteries have high requirements for power performance, and it is inevitable that they need to be frequently charged and discharged at high rates, which leads to large heat production of the battery, which may bring several problems: (1) The large heat production leads to The deterioration of the battery is accelerated, and the cycle/storage life is reduced; (2) heat accumulation and difficulty in heat dissipation may bring safety risks; (3) the poor thermal conductivity of the battery itself requires external liquid cooling, resulting in high energy consumption and high carbon emissions. How to improve the heat dissipation performance of the battery has become the main direction of the battery design at this stage.
  • the present application provides a cell lead-out sheet with good heat dissipation performance.
  • the heat dissipation performance of the cell lead-out sheet is improved by arranging a heat-conducting member at the installation gap between two extending branches of the cell lead-out sheet.
  • the present application provides a cell lead-out sheet, comprising a heat conducting member, a main body portion and two extension branches bent and extended from one end of the main body portion, and the main body portion is used for electrically connecting the positive and negative electrodes of the battery a column, the two extension branches are respectively used for electrical connection with the tabs of the pole core of the battery, the two extension branches are arranged at intervals to form an installation gap, and the heat conducting member is arranged on the two extension branches away from the On one side of the pole core, the heat conducting member at least partially covers the installation gap.
  • the pole core is formed by winding a positive electrode sheet, a separator and a negative electrode sheet. On both sides of the wound pole core are the pole ears drawn from the positive and negative electrode sheets for conducting current.
  • a plurality of tabs are pressed together to form a design of all tabs, and the lead-out sheet of the cell is to electrically connect the pressed tabs to the positive and negative poles outside the casing.
  • the electrical connection between the cell lead-out piece and the tab is to weld two extension branches to the two sides of the tab.
  • the two extension branches need to be spaced to form an installation gap. Mounting clearances are used for battery assembly.
  • a heat-conducting member is arranged on the side of the installation gap away from the pole core.
  • the heat-conducting member increases the heat dissipation area of the cell lead-out sheet in disguised form and improves the heat-dissipation effect of the cell lead-out sheet.
  • the heat-conducting member may be a
  • the heat sink can also be a heat dissipation net, or other structures that can dissipate heat, which is not specifically limited here. Disposing the heat sink at the installation gap is a reasonable utilization of the space structure, and the heat dissipation area of the lead-out sheet of the battery core is increased on the premise of not affecting the operation of the pole core, and the heat dissipation effect is improved.
  • the heat conducting member completely covers the installation gap. In the embodiment, the heat-conducting member fully covers the installation gap to maximize the heat-dissipating area, and the heat-dissipating effect is maximized.
  • both ends of the heat conducting member are respectively connected to the two extending branches.
  • the two ends of the heat-conducting member are respectively bonded to the two extension branches.
  • the two ends of the heat-conducting member can be coated with adhesive, and then the two ends are bonded to the extension branches. It is also possible to make the two ends of the heat conducting member respectively hang on the extension branches, and then use tape to wrap the heat conducting member around the installation gap.
  • one end of the heat conducting member is connected to one side surface of the tab.
  • one end of the heat-conducting member can be used to connect to one side of the tab by welding, and the other end of the heat-conducting member is used to bend and cover the on the installation space.
  • the extending direction of the main body part is the first direction
  • the extending direction of the two extending branches is the second direction
  • the two extending branches are relatively spaced apart
  • the The first direction, the second direction and the third direction are perpendicular to each other.
  • the installation gap is formed by the two extending branches arranged at intervals in the third direction, so that the lead-out sheet of the cell can better fit the structural design of the pole core.
  • the surface of one of the extension branches is used for abutting with one side of the tab, and the surface of the other extension branch is used for fitting with the other side of the tab.
  • the surfaces of the two extending branches are respectively fitted with two side surfaces of the tabs.
  • a connecting portion is further included, the connecting portion is located at one end of the extension branch away from the main body portion, and connects the two extending branches.
  • the design of the connecting part is to connect the two extension branches to ensure its stability.
  • the plate surface is connected to the tabs by welding.
  • the welding method here can be ultrasonic welding or laser welding to ensure the flatness and stability of the structure.
  • the extension branches are connected to the tabs by ultrasonic welding or laser welding.
  • the thermally conductive member is made of metal.
  • a side spacer made of insulating material is provided on the tab to separate the heat conducting member and the battery case.
  • the thermally conductive member is made of thermally conductive silica gel.
  • the thermally conductive member is made of composite ceramic material.
  • the composite ceramic material includes a mixture of plastic and a high thermal conductivity material.
  • the thermally conductive member is a carbon-based material.
  • the carbon-based material includes a heat dissipation layer and a thermally conductive insulating layer.
  • the present application provides a battery, comprising a casing, a pole core and the above-mentioned cell lead-out piece, the cell lead-out piece and the pole core are electrically connected to form a pole core assembly, and the pole core assembly is accommodated in the casing.
  • the lead-out piece of the battery cell is electrically connected to the tab of the pole core, and the two are jointly accommodated in the casing.
  • the casing includes a lower casing and a cover plate. The lead-out piece is placed in the accommodating space, the cover plate is provided with a positive pole post and a negative pole pole, and the tab is connected to the positive and negative pole poles through the cell lead-out piece.
  • the present application provides an electric vehicle, including the above-mentioned battery.
  • the battery cell lead-out sheet of the battery has a good heat dissipation effect, which can effectively reduce the heat dissipation problem during the operation of the pole core, and avoid the electric vehicle because the battery is in the battery.
  • the pole core is overheated, resulting in abnormal use.
  • the heat-dissipating area of the cell lead-out sheet is increased without affecting the operation of the cell lead-out sheet by arranging a heat-conducting member at the installation gap between the two extending branches. Thermal performance.
  • FIG. 1 is a schematic structural diagram of the installation of a cell lead-out sheet and a pole core that hides a heat-conducting member in an embodiment of the present application;
  • FIG. 2 is a schematic structural diagram of the installation of a cell lead-out sheet and a pole core in an embodiment of the present application
  • FIG. 3 is a schematic structural diagram of a cell lead-out sheet that hides a heat-conducting member in an embodiment of the present application
  • FIG. 4 is a schematic structural diagram of a cell lead-out sheet in an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of the installation of the cell lead-out sheet and the pole core in another embodiment of the present application.
  • FIG. 6 is a left side view of the installation of the cell lead-out sheet and the pole core in an embodiment of the present application
  • FIG. 7 is a block diagram of a battery in an embodiment of the present application.
  • FIG. 8 is a block diagram of an electric vehicle in one embodiment of the present application.
  • the present application provides a cell lead-out sheet 10, which can be widely used in battery assembly.
  • a cell lead-out sheet 10 which can be widely used in battery assembly.
  • FIGS. 1 to 5 please refer to FIGS. 1 to 5 together.
  • FIG. 1 is a schematic structural diagram of the cell lead-out sheet 10 when the heat-conducting member 13 is hidden.
  • the cell lead-out sheet 10 includes a main body portion 11 and two extension branches 12 drawn from the main body portion 11 .
  • the main body portion 11 is externally connected to the positive and negative poles 40
  • the two extension branches 12 are respectively electrically connected to the pole core 20 , as shown in FIG. 3 .
  • the two extending branches 12 are spaced apart to form installation gaps 14 .
  • the installation gaps 14 are prefabricated spaces for the subsequent welding of the cell lead-out pieces 10 and the tabs 21 , which is convenient for the placement of welding equipment.
  • the heat-conducting element 13 is arranged on the side of the mounting gap 14 facing away from the pole core 20 .
  • the pole core 20 in the embodiment is usually formed by winding a positive electrode sheet, a separator and a negative electrode sheet. Both sides of the wound pole core 20 are the pole lugs 21 drawn out by the positive and negative electrode sheets for conducting current. 20 output power to reduce the internal resistance, usually a plurality of tabs 21 are pressed together to form a design of full tabs, and the cell lead-out sheet 10 is the tab 21 that is pressed together with the external positive and negative poles 40. electrical connection.
  • the electrical connection between the cell lead-out piece 10 and the tab 21 is by welding two extending branches 12 to both sides of the tab 21 .
  • two extension branches 12 need to be spaced apart, thereby forming an installation gap 14 .
  • the design of this embodiment is to provide a heat-conducting member 13 on the side of the installation gap 14 away from the pole core 21 , the heat-conducting member 13 at least partially covers the installation gap 14 , and the cell lead-out sheet 10 is added in disguised form through the heat-conducting member 13 .
  • the large heat dissipation area improves the heat dissipation effect of the cell lead-out sheet 10 .
  • the thermally conductive member 13 may be a heat sink, a heat dissipation net, or other structures capable of dissipating heat, which are not specifically limited here. Disposing the heat sink 13 at the installation gap is a reasonable utilization of the space structure, and increases the heat dissipation area of the cell lead-out sheet 10 and improves the heat dissipation effect without affecting the operation of the pole core 20 .
  • the extending direction of the main body portion 11 is the first direction X
  • the extending direction of the two extending branches 12 is the second direction Y
  • the third direction Z the two extending branches 12 Relatively spaced, the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the thermally conductive member 13 completely covers the installation gap 14 .
  • the heat conducting member 13 completely covers the installation gap 14 between the extension branches 12 , thereby increasing the heat dissipation area of the entire cell lead-out sheet 10 and maximizing the heat dissipation effect.
  • the technical solution of the present application can reasonably utilize the installation gap 14 between the two extension branches 12 to increase the heat dissipation area of the cell lead-out sheet 10. Therefore, in this embodiment, the thermally conductive member 13 forms a full coverage of the installation gap 14, so as to maximize the heat dissipation area. possible to improve the cooling effect.
  • the opposite direction of the two extending branches 12 is the third direction Z, and the two ends of the heat conducting member 13 on the third direction Z are respectively connected to the two 12 extension branches.
  • the two ends of the heat-conducting member 13 in the third direction Z are respectively bonded to the two extension branches 12.
  • the two ends of the heat-conducting member 13 may be coated with adhesive.
  • the opposite direction of the two extending branches 12 is the third direction Z, and one end of the heat conducting member 13 in the third direction Z is connected to the tab 21 side.
  • one end of the heat-conducting member 13 is connected to one side of the tab 21 by welding, and the other end of the heat-conducting member 13 only needs to be bent to cover the installation gap. 14 will do.
  • adhesive tape can be used to connect the two ends of the heat-conducting member 13 to both sides of the tab 21. It should be noted that no matter how the heat-conducting member 13 and the tab 21 are connected, the The complete coverage of the mounting gap 14 by the heat conducting member 13 must be satisfied.
  • the surface of one extended branch 12 is in contact with one side of the tab 21
  • the surface of the other extended branch 12 is in contact with the other side of the tab 21 .
  • one end of the extension branch 12 away from the main body part 11 is provided with a connecting part 16 , and the connecting part 16 is used to connect the two extending branches 12 .
  • the design of the connecting portion 16 is to connect the two extension branches 12 to ensure the stability of the structure.
  • the plate surface of the extension branch 12 is connected to the tab 21 by welding.
  • the welding method here can be ultrasonic welding or laser welding to ensure the flatness and stability of the structure.
  • thermally conductive member in this application is a material with good thermal conductivity.
  • the heat conducting member is made of a metal material, and the metal material here can be selected from one or more of aluminum, brass, red copper, steel, and iron.
  • a side spacer can be added to the tab, usually a side spacer is placed on the side of the tab end, and the side spacer is an insulating material, such as PP or PE and other plastic insulation. material to prevent the metal heat-conducting member from contacting the battery casing, and avoid problems such as leakage and short circuit.
  • the thermally conductive member is made of thermally conductive silica gel.
  • Thermally conductive silicone material is an insulating thermally conductive material, such as one or more of aluminum oxide, silicon oxide, magnesium oxide, zinc oxide, aluminum nitride, boron nitride, magnesium oxide, silicon carbide, etc.
  • the thermally conductive parts made of thermally conductive silica gel have good insulation properties to avoid accidents such as short circuit or leakage due to the setting of the thermally conductive parts.
  • the heat conducting member is made of composite ceramic material.
  • the composite ceramic here is mainly a mixture of plastic and high thermal conductivity material.
  • the plastic can be one or more of PP (polypropylene) and PE (polyethylene), and the high thermal conductivity material can be aluminum oxide, silicon oxide, magnesium oxide, One or more of zinc oxide, aluminum nitride, boron nitride, magnesium oxide, silicon carbide, etc.
  • the thermally conductive parts made of composite ceramic materials not only meet the needs of heat dissipation, but also have no risk of short-circuit leakage.
  • the thermally conductive member is a carbon-based material.
  • the carbon-based material here includes a heat dissipation layer and a thermally conductive insulating layer.
  • the heat dissipation layer can be one or more of carbon-based materials such as graphene, carbon black, carbon tube, and graphite
  • the thermally conductive insulating layer can be one or more of thermally conductive silica gel or composite ceramics.
  • the present application provides a battery 100 , which includes a case 30 , a pole core 20 and a cell lead-out piece 10 , the cell lead-out piece 10 is electrically connected to the pole core 20 and is accommodated in the casing 30 Inside.
  • the lead-out piece of the battery cell is electrically connected to the tab of the pole core, and the two are jointly accommodated in the casing.
  • the casing includes a lower casing and a cover plate. The lead-out sheet is placed in the accommodation space, the cover plate is provided with positive and negative poles, and the tabs are connected to the positive and negative poles through the cell lead-out piece. Good heat dissipation effect avoids the danger caused by the high temperature of the pole core during operation.
  • the battery provided in this embodiment can greatly reduce the contact thermal resistance on the side of the pole core after using the battery core lead-out sheet including the heat-conducting member.
  • a set of actual measurement data is used for comparison and description.
  • the experimental steps include: (1) Select the cell lead-out sheet with a thermal conductor to assemble the battery; (2) Add at least three thermocouples to each surface of the outer surface of the casing to ensure the accuracy of temperature sampling, and the test conditions : 25°C, 50% SOC battery, continuously charged and discharged at 6C/10S. Until the temperature of each thermocouple reaches equilibrium (equilibrium condition: temperature change 0.5°/10min), obtain the experimental data under the above conditions; (3) Take the initial cell, remove the heat-conducting parts, also test according to the above method, and obtain again Experimental data; (4) The measured data is used to calculate the contact thermal resistance in all directions of the cell through simulation.
  • the contact thermal resistance data on the side of the pole core decreases from 0.002915K*m 2 /W to 0.0015K*m 2 /W after adding the thermally conductive member.
  • the cell lead-out sheet with the heat-conducting member can have a good effect on the heat dissipation of the pole core.
  • the present application provides an electric vehicle 1000, including the above-mentioned battery 100.
  • the battery cell lead-out sheet of the battery has a good heat dissipation effect, which improves the heat dissipation performance of the pole core and avoids The safety hazard caused by the high temperature of the pole core; at the same time, if the heat dissipation performance of the pole core itself is poor, external equipment is required for liquid cooling, which in disguise increases the energy consumption of electric vehicles and brings about the problem of high carbon emissions.
  • the present application can also reduce the thermal resistance of the whole package and reduce the energy consumption of the whole vehicle.

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Abstract

一种电芯引出片(10)、电池及电动汽车，该电芯引出片(10)包括导热件(13)、主体部(11)和从主体部(11)的一端弯折延伸的两个延伸枝节(12)，主体部(11)用于电连接电池的正负极极柱(40)，两个延伸枝节(12)分别用于与电池中极芯(20)的极耳(21)电连接，两个延伸枝节(12)间隔设置形成安装空隙(14)，导热件(13)设置在两个延伸枝节(12)背离极芯(20)的一侧，导热件(13)至少部分覆盖安装空隙(14)。

Description

电芯引出片、电池及电动汽车
相关申请的交叉引用
本申请要求申请日为2020年06月28日、申请号为202021216701.6、专利申请名称为“电芯引出片、电池及电动汽车”的优先权，其全部内容通过引用并入到本申请中。
技术领域
本申请涉及电动汽车领域，特别涉及电芯引出片、电池及电动汽车。
背景技术
目前高功率电池，例如HEV(Hybrid Electric Vehicle混合动力)或mHEV(Mild Hybrid Electric Vehicle轻度混合动力)，多采用全极耳设计。而HEV/mHEV电池对功率性能要求很高，不可避免需要满足经常在大倍率下进行充放电，这就导致电池的产热量大，随之可能带来几个问题：(1)产热量大导致电池劣化加速，循环/储存寿命降低；(2)热量累积，散热困难，可能带来安全风险；(3)电池本身导热性能差需要外部液冷，带来能耗大，碳排放高的问题。如何提升电池的散热性能成为现阶段电池设计的主要方向。
发明内容
本申请提供一种具有良好散热性能的电芯引出片，通过在电芯引出片的两个延伸枝节间的安装空隙处设置导热件，从而提升其散热性能。
一方面，本申请提供一种电芯引出片，包括导热件、主体部和从所述主体部的一端弯折延伸的两个延伸枝节，所述主体部用于电连接电池的正负极极柱，两个所述延伸枝节分别用于与所述电池的极芯的极耳电连接，两个所述延伸枝节间隔设置形成安装空隙，所述导热件设置在两个所述延伸枝节背离所述极芯的一侧，所述导热件至少部分覆盖所述安装空隙。极芯是由正极片、隔膜和负极片卷绕形成，卷绕的极芯两侧是由正负极片引出的用于导流的极耳，为了提升极芯的输出功率，降低内阻，通常将多个极耳压合一体形成全极耳的设计，电芯引出片则是将该压合的极耳与壳体外部的正负极极柱电连接。电芯引出片与极耳电连接的方式是通过两个延伸枝节与极耳的两侧进行焊接，出于电池装配的需要，两个延伸枝节之间需要间隔设置，从而形成一个安装空隙，该安装空隙用于电池装配的使用。本申请在安装空隙背离极芯的一侧设置导热件，通过导热件将变相增加了电芯引出片的散热面积，提升了电芯引出片的散热效果，具体的，该导热件可以是一张散热片，也可 以是一块散热网，或是其他可以散热的结构，这里不做具体限定。将该散热件设置在安装空隙处是对该空间结构的合理利用，在不影响极芯工作的前提下增加了电芯引出片的散热面积，提升了散热效果。
在一种实施例中，所述导热件对所述安装空隙进行全覆盖。实施例中导热件对安装空隙进行全面的覆盖将散热面积增加到最大，散热效果得到最大的提升。
在一种实施例中，所述导热件的两端分别连接于两个所述延伸枝节。导热件的两端分别和两个延伸枝节粘结在一起，具体的粘结方式有多种，可以是在导热件的两端涂覆粘接剂，然后将两端粘接在延伸枝节上，也可以让导热件的两端分别搭在延伸枝节上，然后利用胶带，将导热件缠绕在安装空隙处。
在一种实施例中，所述导热件的一端连接于所述极耳的一个侧面。实施例中，为了让导热件安装的更为牢固，本实施例可以采用焊接的方式将导热件的一端用于连接于极耳的一个侧面，所述导热件的另一端用于弯折覆盖在所述安装空隙上。
在一种实施例中，所述主体部的延伸方向为第一方向，两个所述延伸枝节的延伸方向为第二方向，在第三方向上，所述两个延伸枝节相对间隔设置，所述第一方向、所述第二方向和所述第三方向相互垂直。通过在第三方向上间隔设置的两个延伸枝节，形成安装空隙，使得电芯引出片能够更加贴合极芯的结构设计。
在一种实施例中，其中一个所述延伸枝节的表面用于与所述极耳的一个侧面贴合，另一个所述延伸枝节的表面用于与所述极耳的另一个侧面贴合。两个延伸枝节的表面分别与极耳的两侧面贴合。这样的板面贴合设计一方面增大了电流传输的功率，另一方面也增加了延伸枝节的散热能力。
一种实施例中，还包括连接部，所述连接部位于所述延伸枝节远离所述主体部的一端，且连接两个所述延伸枝节。连接部的设计在于将两个延伸枝节进行连接，确保其稳定性。
一种实施例中，所述板面通过焊接的方式与所述极耳连接。这里的焊接方式可以是超声焊或激光焊，以此确保结构的平整度和稳定性。
在一种实施例中，所述延伸枝节通过超声焊或激光焊与所述极耳连接。
在一种实施例中，所述导热件为金属材质。
在一种实施例中，所述极耳上设有绝缘材质的侧隔圈，以间隔所述导热件和电池的壳体。
在一种实施例中，所述导热件为导热硅胶材质。
在一种实施例中，所述导热件为复合陶瓷材质。
在一种实施例中，所述复合陶瓷材质包括塑料和高导热材料的混合物。
在一种实施例中，所述导热件为碳基材料。
在一种实施例中，所述碳基材料包括散热层和导热绝缘层。
第二方面，本申请提供一种电池，包括壳体、极芯和上述的电芯引出片，电芯引出片与极芯电连接组成极芯组件，所述极芯组件收容于壳体内。实施例中，电芯引出片与极芯的极耳电连接，二者共同被收容在壳体内部，具体的，壳体包括下壳体和盖板，下壳体具有一个收容空间，电芯引出片被放置在收容空间内，盖板上设有正极极柱和负极极柱，极耳通过电芯引出片与正负极极柱连接。
第三方面，本申请提供一种电动汽车，包括上述的电池，上述实施例中电池的电芯引出片具有良好的散热效果，能有效降低极芯工作时的散热问题，避免电动汽车因为电池中的极芯过热导致使用异常。
本申请实施例中电芯引出片，通过在其两个延伸枝节间的安装空隙处设置导热件，在不影响电芯引出片工作的情况下，增加了电芯引出片的散热面积，提升其散热性能。
附图说明
图1是本申请一个实施例中隐藏导热件的电芯引出片和极芯安装的结构示意图；
图2是本申请一个实施例中电芯引出片与极芯安装的结构示意图；
图3是本申请一个实施例中隐藏导热件的电芯引出片的结构示意图；
图4是本申请一个实施例中电芯引出片的结构示意图；
图5是本申请另一个实施例中电芯引出片与极芯安装的结构示意图；
图6是本申请一个实施例中电芯引出片与极芯安装的左视图；
图7是本申请一个实施例中电池的方框图；
图8是本申请一个实施例中电动汽车的方框图。
具体实施方式
下面将结合附图，对本申请的具体实施方式进行清楚地描述。
本申请提供一种电芯引出片10，该电芯引出片10可广泛应用于电池组装中。为了更详尽的说明方案中电芯引出片10的特征，请一并参阅图1至图5。
如图1和图2所示，电芯引出片10和极芯20安装的结构示意图，其中图1中是电芯引出片10在隐藏导热件13时的结构示意图。电芯引出片10包括主体部11和从主体部11引出的两个延伸枝节12，主体部11外接正负极柱40，两个延伸枝节12分别与极芯20电连接，如图3所示，两个延伸枝节12间隔设置形成安装空隙14，这里的安装空隙14是为了之后电芯引出片10与极耳21的焊接所预制的空间，便于焊接器材的放置。在安装空隙14背离极芯20的一侧设置导热件13。实施例中的极芯20通常是由正极片、隔膜和负极片 卷绕形成，卷绕的极芯20两侧是由正负极片引出的用于导流的极耳21，为了提升极芯20的输出功率，降低内阻，通常将多个极耳21压合一体形成全极耳的设计，电芯引出片10则是将该压合的极耳21与外部的正负极极柱40电连接。电芯引出片10与极耳21电连接的方式是通过两个延伸枝节12与极耳21的两侧进行焊接。如图3所示，出于电池设置的需要，两个延伸枝节12之间需要间隔设置，从而形成一个安装空隙14。如图2所示，本实施例设计是在安装空隙14背离极芯21的一侧设置导热件13，导热件13至少部分覆盖安装空隙14，通过导热件13将变相增加了电芯引出片10的散热面积，提升了电芯引出片10的散热效果。需要说明的是，该导热件13可以是一张散热片，也可以是一块散热网，或是其他可以散热的结构，这里不做具体限定。将该散热件13设置在安装空隙处是对该空间结构的合理利用，在不影响极芯20工作的前提下增加了电芯引出片10的散热面积，提升了散热效果。
具体的，如图1和图3所示，主体部11的延伸方向为第一方向X，两个延伸枝节12的延伸方向为第二方向Y，在第三方向Z上，两个延伸枝节12相对间隔设置，第一方向X、第二方向Y和第三方向Z相互垂直。
在一个具体的实施例中，如图2、图3和图4所示，导热件13对安装空隙14进行全覆盖。实施例中导热件13对延伸枝节12之间的安装空隙14进行全面的覆盖，从而提升了整个电芯引出片10的散热面积，使散热效果得到最大的提升。本申请技术方案可合理利用两个延伸枝节12之间的安装空隙14来提升电芯引出片10的散热面积，所以在本实施例中，导热件13形成对安装空隙14的全覆盖，从而尽可能的提升散热效果。
在一个具体的实施例中，如图2、图3和图4所示，两个延伸枝节12相对的方向为第三方向Z，导热件13在第三方向Z上的两端分别连接于两个延伸枝节12。具体的，导热件13在第三方向Z上的两端分别和两个延伸枝节12粘结在一起，这里的粘结方式有多种，可以是在导热件13的两端涂覆粘接剂，然后将两端粘接在延伸枝节12上，形成对安装空隙14的全覆盖；也可以让导热件13的两端分别搭在延伸枝节12上，然后利用胶带将导热件13缠绕在延伸枝节12上，形成对安装空隙14的全覆盖。
在一个具体的实施例中，如图3、图4和图5所示，两个延伸枝节12相对的方向为第三方向Z，导热件13在第三方向Z上的一端连接于极耳21的一侧。具体的，为了让导热件13安装的更为牢固，本实施例采用焊接的方式将导热件13的一端连接于极耳21的一侧面，导热件13的另一端则只需要弯折覆盖安装空隙14即可。在另一个具体的实施例中，可以选用胶带将导热件13的两端与极耳21的两侧进行固定连接，需要说明的是，不管导热件13和极耳21以何种方式连接，都必须满足导热件13对安装空隙14的全覆盖。
在一个具体的实施例中，如图6所示，其中一个延伸枝节12的表面与极耳21的一个 侧面贴合，另一个延伸枝节12的表面与极耳21的另一个侧面贴合。这样的贴合设计一方面增大了电流传输的功率，另一方面也增加了延伸枝节12的散热能力。
在一个具体的实施例中，如图3和图6所示，延伸枝节12远离主体部11的一端设有连接部16，连接部16用于连接两个延伸枝节12。连接部16的设计在于将两个延伸枝节12进行连接，确保其结构的稳定性。
在一个具体的实施例中，如图6所示，延伸枝节12的板面通过焊接的方式与极耳21连接。这里的焊接方式可以是超声焊或激光焊，以此确保结构的平整度和稳定性。
需要说明的是，本申请中导热件为具有良好导热性能的材质。
具体的，导热件为金属材质，这里的金属材质可以选取如铝、黄铜、紫铜、钢、铁中的一种或多种。需要说明的是在选取金属材质的导热件后，可在极耳上加侧隔圈，通常在侧面极耳端套侧隔圈，该侧隔圈为绝缘材质，例如PP或PE等塑料的绝缘材质，以防止金属材质的导热件与电池的壳体发生接触，避免漏电和短路等问题的发生。
具体的，导热件为导热硅胶材质。导热硅胶材质是一种绝缘的导热材料，例如氧化铝，氧化硅，氧化镁，氧化锌，氮化铝，氮化硼，氧化镁，碳化硅等中的一种或多种。采用导热硅胶材质的导热件具有良好的绝缘性能，避免因为导热件的设置发生短路或漏电等事故。
具体的，导热件为复合陶瓷材质。这里的复合陶瓷主要是塑料与高导热材料的混合物，塑料可以是PP(聚丙烯)、PE(聚乙烯)中的一种或多种，高导热材料可以是氧化铝，氧化硅，氧化镁，氧化锌，氮化铝，氮化硼，氧化镁，碳化硅等中的一种或多种。采用复合陶瓷材质的导热件不仅满足散热的需要，同时也没有短路漏电的风险。
在一个具体的实施例中，导热件为碳基材料。这里的碳基材料包括散热层和导热绝缘层。散热层可以是石墨烯、炭黑、碳管、石墨等碳基材料中的一种或多种，导热绝缘层可以是导热硅胶或者复合陶瓷中的一种或者多种。
第二方面，参照图7所示，本申请提供一种电池100，包括壳体30、极芯20和电芯引出片10，电芯引出片10与极芯20电连接，收容于壳体30内。实施例中，电芯引出片与极芯的极耳电连接，二者共同被收容在壳体内部，具体的，壳体包括下壳体和盖板，下壳体具有一个收容空间，电芯引出片被放置在收容空间内，盖板上设有正负极极柱，极耳通过电芯引出片与正负极极柱连接，实施例中电池因为电芯引出片上导热件的设计，具有很好的散热效果，避免了工作时极芯因为温度过高而带来的危险。
本实施例所提供的电池在使用了包含导热件的电芯引出片以后，能够大幅降低其极芯侧面的接触热阻，这里以一组实际测量数据进行对比说明。
实验步骤包括：(1)选用带有导热件的电芯引出片进行电池的装配；(2)在壳体的外表面每个面至少加上三个热电偶以保证采温准确性，测试条件：25℃，50％SOC电池，以 6C/10S连续进行充放。直到每个热电偶的温度都达到平衡(平衡条件：温度变化0.5°/10min)，在上述条件下获取实验数据；(3)取初始电芯，去除导热件，也按上述方法测试，再次获取实验数据；(4)实测得到的数据通过仿真计算出电芯各个方向的接触热阻。
得到下表1数据：
单位(K*m 2/W) 不含导热件 含有导热件
侧面 0.002915 0.0015
大面 0.00245 0.00245
顶面 0.04 0.04
底面 0.02 0.02
表1
从表1中看出加了导热件以后，极芯侧面的接触热阻数据降低，从0.002915K*m 2/W降到0.0015K*m 2/W，由此可以看出本申请所提供的带有导热件的电芯引出片能够对极芯的散热有很好的效果。
第三方面，参照图8所示，本申请提供一种电动汽车1000，包括上述电池100，上述实施例中电池的电芯引出片具有良好的散热效果，提高了极芯的散热性能，避免因为极芯温度过高而带来的安全隐患；同时，如果极芯自身的散热性能差，就需要外部设备进行液冷降温，变相增加了电动汽车的能耗，带来碳排放高的问题，因此本申请也可以减小整包热阻，降低整车能耗。
以上仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以权利要求的保护范围为准。

Claims (20)

  1. 一种电芯引出片，其特征在于，包括导热件、主体部和从所述主体部的一端弯折延伸的两个延伸枝节，所述主体部用于电连接电池的正负极极柱，两个所述延伸枝节分别用于与所述电池中极芯的极耳电连接，两个所述延伸枝节间隔设置形成安装空隙，所述导热件设置在两个所述延伸枝节背离所述极芯的一侧，所述导热件至少部分覆盖所述安装空隙。
  2. 如权利要求1所述的电芯引出片，其特征在于，所述导热件对所述安装空隙进行全覆盖。
  3. 如权利要求2所述的电芯引出片，其特征在于，所述导热件的两端分别连接于两个所述延伸枝节。
  4. 如权利要求2所述的电芯引出片，其特征在于，所述导热件的一端用于连接于所述极耳的一个侧面，所述导热件的另一端用于弯折覆盖所述安装空隙上。
  5. 如权利要求3或4所述的电芯引出片，其特征在于，所述主体部的延伸方向为第一方向，两个所述延伸枝节的延伸方向为第二方向，在第三方向上，所述两个延伸枝节相对间隔设置，所述第一方向、所述第二方向和所述第三方向相互垂直。
  6. 如权利要求5所述的电芯引出片，其特征在于，其中一个所述延伸枝节的表面用于与所述极耳的一个侧面贴合，另一个所述延伸枝节的表面用于与所述极耳的另一个侧面贴合。
  7. 如权利要求6所述的电芯引出片，其特征在于，还包括连接部，所述连接部位于所述延伸枝节远离所述主体部的一端，且连接两个所述延伸枝节。
  8. 如权利要求6或7所述的电芯引出片，其特征在于，所述延伸枝节通过焊接的方式与所述极耳连接。
  9. 如权利要求8所述的电芯引出片，其特征在于，所述延伸枝节通过超声焊或激光焊与所述极耳连接。
  10. 如权利要求1-9任一所述的电芯引出片，其特征在于，所述导热件为金属材质。
  11. 如权利要求10所述的电芯引出片，其特征在于，所述极耳上设有绝缘材质的侧隔圈，以间隔所述导热件和电池的壳体。
  12. 如权利要求1-9任一所述的电芯引出片，其特征在于，所述导热件为导热硅胶材质。
  13. 如权利要求1-9任一所述的电芯引出片，其特征在于，所述导热件为复合陶瓷材质。
  14. 如权利要求13所述的电芯引出片，其特征在于，所述复合陶瓷材质包括塑料和高 导热材料的混合物。
  15. 如权利要求1-9任一所述的电芯引出片，其特征在于，所述导热件为碳基材料。
  16. 如权利要求15所述的电芯引出片，其特征在于，所述碳基材料包括散热层和导热绝缘层。
  17. 一种电池，其特征在于，包括壳体、极芯和如权利要求1-16中任一所述的电芯引出片，所述极芯和所述电芯引出片收容于所述壳体内。
  18. 如权利要求17所述的电池，其特征在于，所述壳体包括下壳体和盖板，所述下壳体具有收容空间，所述电芯引出片放置在所述收容空间内。
  19. 如权利要求18所述的电池，其特征在于，所述盖板上设有所述正负极极柱，所述极耳通过所述电芯引出片与所述正负极极柱连接。
  20. 一种电动汽车，其特征在于，包括如权利要求17-19中任一所述电池。
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