WO2019114776A1 - 电池系统及电动汽车 - Google Patents

电池系统及电动汽车 Download PDF

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Publication number
WO2019114776A1
WO2019114776A1 PCT/CN2018/120767 CN2018120767W WO2019114776A1 WO 2019114776 A1 WO2019114776 A1 WO 2019114776A1 CN 2018120767 W CN2018120767 W CN 2018120767W WO 2019114776 A1 WO2019114776 A1 WO 2019114776A1
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WO
WIPO (PCT)
Prior art keywords
battery
battery system
electrode
score
series
Prior art date
Application number
PCT/CN2018/120767
Other languages
English (en)
French (fr)
Inventor
何龙
沈晞
蒋露霞
江文锋
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.)
Filing date
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 EP18888794.7A priority Critical patent/EP3726625A4/en
Priority to US16/954,129 priority patent/US20210162872A1/en
Priority to JP2020532685A priority patent/JP7076552B2/ja
Priority to KR1020207020236A priority patent/KR102477392B1/ko
Publication of WO2019114776A1 publication Critical patent/WO2019114776A1/zh

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    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • 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
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • 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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • 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
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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 disclosure relates to the field of batteries, and relates to a battery system and an electric vehicle.
  • the soft pack battery is prone to abnormalities such as overcharging and causing explosion of the soft pack battery.
  • the present disclosure provides a battery system including at least one series circuit in which a soft pack battery and a first unit battery connected in series with at least one of the soft pack batteries are disposed.
  • the first unit cell is provided with a current interrupting device; the current interrupting device of the first unit cell is configured to disconnect the at least one of the soft pack battery and the first unit battery when an abnormality occurs The internal current of the first cell.
  • the series circuit includes a plurality of first single cells connected in series with the soft pack battery, and the plurality of first single cells are sequentially connected in series or in series in series.
  • the series circuit includes a plurality of first single cells connected in series with the soft pack battery, and the plurality of first single cells are connected in parallel to form a battery pack in series with the soft pack battery.
  • the first unit cell includes a housing, a battery core housed in the housing, a cover plate enclosing the housing, an electrode inner terminal located inside the cover plate, and the cover plate
  • the outer electrode outer terminal is electrically connected to the battery core
  • the current interrupting device is disposed on the cover plate and electrically connected to the electrode outer terminal and the electrode inner terminal, respectively.
  • the outer casing is one of an aluminum casing, a steel casing, and a plastic casing, and the outer casing has a thickness of 0.4 mm to 1.5 mm.
  • the current interrupting device includes a scoring member electrically connected to the electrode inner terminal, and a flip member respectively surrounding the scoring member and the electrode The terminal is electrically connected and in gas communication with the interior of the first unit cell.
  • the indentation member includes a scored region formed with a score, a first weld zone for electrically interconnecting the flip member, and a second weld zone for electrically connecting to the electrode inner terminal
  • the flip member is capable of acting under air pressure to break the score, the score is disposed around the first weld zone, and at least one of the first weld zone and the second weld zone is The nicked facets are set.
  • the score is disposed opposite the first weld zone and the second weld zone.
  • the scoring member is formed with a boss protruding from the scoring region, the first land is formed by the upper surface of the boss and parallel to the scoring region, and The outer periphery of the upper surface is provided with a ring-shaped solder joint.
  • the outer periphery of the scored region is formed with a ring wall projecting in the same direction as the boss, the upper edge of the ring wall being aligned with the upper edge of the boss in the height direction, And the outer wall of the ring wall is for electrically connecting to the inner terminal of the electrode.
  • the second weld zone, the scored zone, and the first weld zone are arranged in a radial direction from the outside to the inside, and are formed from the outside to the inside to gradually approach the stepped structure of the flip member,
  • the score is disposed around the first weld zone.
  • an outer circumference of the scored region is formed with a ring wall that is convexly protruding from the boss, and the second land is formed on an outer circumference of the ring wall and is nicked The regions are parallel, and the outer periphery of the second land is formed with a ring-shaped solder joint.
  • the sidewalls of the boss and the ring wall are perpendicular to the scored region, respectively.
  • the first weld zone, the score zone, and the second weld zone are each formed in a ring structure.
  • the flip member is formed with a first connection region for electrically connecting to the scoring member and a second connection region for electrically connecting to the electrode outer terminal, the flip member further A deformation buffer is formed, and the deformation buffer is disposed in the first connection area.
  • the inverting member is a sheet-like structure forming a taper shape, the small end of the taper being formed as the first connecting region, and the large end being formed as the second connecting portion away from the scoring member .
  • the deformation buffer is formed as an annular groove structure surrounding the first connection region.
  • the annular groove structure has a radial cross section that is curved or angled.
  • a support ring is sealingly connected between the lower side of the outer periphery of the inverting member and the cover plate, and an outer circumference of the electrode outer terminal is electrically connected to an upper side of the outer circumference of the inverting member.
  • the inner wall of the support ring is formed with a support flange, and the outer periphery of the flip member and the outer electrode terminal is supported on the upper surface of the support flange.
  • the present disclosure also provides an electric vehicle including the battery system provided by the present disclosure.
  • the process of the soft pack battery during the charging process can be avoided.
  • the abnormality causes an explosion, which improves the safety of the soft pack battery.
  • FIG. 1 is a schematic structural diagram of a battery system according to an embodiment of the present disclosure, in which a current interruption device on a first single cell is not activated, and a series circuit is in a normal working state;
  • FIG. 2 is a schematic structural diagram of a battery system according to an embodiment of the present disclosure, in which a current interruption device on a first single cell is normally started, and a series circuit is in an open state;
  • FIG. 3 is a schematic structural diagram of a battery system according to another embodiment of the present disclosure, in which a current interruption device on a first single cell is not activated, and a series circuit is in a normal working state;
  • FIG. 4 is a schematic structural diagram of a battery system according to another embodiment of the present disclosure, in which a current interruption device on a first single cell is normally started, and a series circuit is in an open state;
  • FIG. 5 is a schematic structural diagram of a battery system according to another embodiment of the present disclosure, in which a current interruption device on one of the first single cells in the battery pack is erroneously activated, and the series circuit is still in a normal working state;
  • FIG. 6 is a partially exploded perspective view of a battery system of an embodiment of the present disclosure.
  • FIG. 7 is a partially exploded perspective view of a battery system of an embodiment of the present disclosure.
  • FIG. 8 is a partially exploded perspective view of a battery system of another embodiment of the present disclosure.
  • FIG. 9 is a partially exploded perspective view of a battery system of another embodiment of the present disclosure.
  • Figure 10 is a cross-sectional view of the current interrupting device of the first embodiment of the present disclosure.
  • Figure 11 is a cross-sectional view of a current interrupting device of a second embodiment of the present disclosure.
  • FIG. 12 is a schematic perspective view of a scoring member according to a second embodiment of the present disclosure.
  • FIG. 13 is a schematic perspective structural view of a flip member according to a first embodiment of the present disclosure.
  • orientation words used such as “up, down, left, and right,” are generally defined on the basis of the direction of the drawing of the corresponding drawing, and "inside and outside” means Inside and outside of the contour of the corresponding part.
  • the battery system includes at least one series circuit in which a soft pack battery 10 and at least one first unit cell 20 connected in series with the soft pack battery 10 are disposed, and A current interrupting device 30 is provided on the first unit cell 20.
  • the current interrupting device 30 on the first unit cell 20 is configured to disconnect the internal current of the first unit cell 20 and disconnect when a certain battery or some of the batteries in the series circuit are abnormal.
  • a certain battery or a plurality of batteries refers to at least one of the soft pack battery 10 and the first unit battery 20.
  • the soft pack battery 10 may include one soft pack unit battery 11 , and may also include a plurality of soft pack unit batteries 11 , which may be multiple a soft pack single cell 11 connected in series, or a plurality of soft pack cells 11 connected in parallel, or a plurality of soft pack cells 11 connected in series and in parallel, the soft pack cell 11 comprising a soft pack cell And an electrode connected in series with the soft cell, the outer casing of the soft cell 11 is an aluminum plastic film.
  • the series circuit may include a first unit cell 20 connected in series with the soft pack battery 10; and may further include a plurality of first unit cells connected in series with the soft pack battery 10, the plurality of first units
  • the body battery 20 may be connected in series with the battery pack (such as the battery pack 60 shown in FIG. 3 to FIG. 5) in series with the soft pack battery 10; or the plurality of first unit cells 20 may be connected in series after each other.
  • the plurality of first unit cells 20 and the plurality of soft pack cells 11 are connected in series in a series circuit.
  • the first unit battery 20 may include a casing 21, a battery core housed in the casing, a cover plate 22 of the package casing 21, an electrode inner terminal 24 located inside the cover plate 22, and an electrode located outside the cover plate 22. Terminal 23.
  • the electrode inner terminal 24 is electrically connected to the battery core, and the electrode outer terminal 23 can complete current input and output through various electrode lead-out members 40.
  • the current interrupting device 30 may be disposed on the cover plate and electrically connected to the electrode outer terminal 23 and the electrode inner terminal 24, respectively, so as to control the input and output of the current of the electrode terminal; in some embodiments, the outer casing is an aluminum casing, One of a steel shell and a plastic shell, the outer shell having a thickness of 0.4 mm to 1.5 mm.
  • the current interruption device 30 is in a state in which the battery cell is electrically connected to the electrode terminal in the non-activated state, that is, the electrical connection between the electrode outer terminal 23 and the electrode inner terminal 24 is normal, The current input and output are normally performed to complete the charging and discharging of the battery system.
  • the first unit cell 20 is heated and the internal pressure of the battery is increased, so as to be disposed on the first unit cell 20.
  • the current interrupting device 30 is activated to disconnect the electrical connection between the electrode outer terminal 23 and the electrode inner terminal 24, thereby interrupting the current input and current output of the electrode terminal, thereby causing the series circuit to be in an open state, thereby preventing thermal runaway of the battery system. .
  • FIG. 1 and FIG. 2 are only exemplified by the fact that the battery system includes one series circuit and only one first single battery is disposed in the series circuit.
  • the battery system may further have a plurality of series circuits, and each of the series circuits may further be provided with a plurality of first single cells, and the plurality of first single cells may be connected in series in any of the series circuits. In position, a plurality of first single cells may also be connected in parallel to form a battery pack in series with the soft pack battery.
  • FIG. 3 to FIG. 5 show that the two first cells are connected in parallel to form a battery pack 60 in series with the soft pack battery 10.
  • FIG. 3 when the series circuit is in a normal state, each first single of the battery pack 60
  • the current interruption device 30 in the body battery 20 is not in operation.
  • the electrode inner terminal 24 and the electrode outer terminal 23 of each of the first unit cells 20 are electrically connected normally, that is, the internal current of each of the first unit cells 20 is turned on.
  • the entire series loop is normal.
  • the current interrupting device 30 in the first unit cell 20 of the battery pack 60 is triggered to be turned on, so that the first unit cell 20 is turned on.
  • the internals of the first single cells Cn(a) and Cn(b)) are all in an open state, thereby causing the entire series circuit to be in an open state, thereby preventing the soft pack battery 10 from being overcharged and achieving protection of the soft pack battery 10. .
  • the soft pack battery 10 may include one or more soft pack cells 11 when the soft pack battery 10 includes a plurality of soft pack cells 11
  • the soft pack cells 11 are connected in series by the conductive connectors 50, or the plurality of soft pack cells 11 are connected in parallel by the conductive connectors 50, or the plurality of flexible pack cells 11 are electrically connected in series Connected in parallel, each of the flexible battery cells 11 includes a soft-packed battery and an electrode electrically connected to the flexible battery, and the electrodes between the two adjacent flexible battery cells are connected in series or in parallel through the conductive connection 50.
  • one of the soft pack cells 10 in the soft pack battery 10 is connected in series with the first unit cell 20 or the battery pack 60, or a plurality of soft pack cells 11 in the pack battery 10 are respectively
  • the first unit cell 20 or the plurality of battery packs 60 are connected in series, and in some embodiments, the positive electrode (negative electrode) of the one of the soft pack cells 10 in the soft pack battery 10 and the first monomer may be passed through the power connection piece 40.
  • the negative electrode (positive electrode) of the battery 20 is welded to form a series or the positive electrode (negative electrode) of one of the soft pack cells 10 of the soft pack battery 10 is welded to the negative electrode of the battery pack (positive electrode lead), and the first monomer is connected in series.
  • the battery pack 20 or the battery pack 11 connected in series may be located at the end of the soft pack battery 10 or at the middle of the soft pack battery 10; according to the present disclosure, the soft pack battery 10 is located on one side or both sides
  • the positive electrode (negative electrode) of the end soft cell unit 11 and the negative electrode (positive electrode) of the first unit cell 20 are welded by the power connection piece 40 or the soft pack battery 10 is located at one or both sides of the soft package.
  • the positive electrode (negative electrode) of the body battery 11 and the negative electrode of the battery pack are taken out (positive electrode lead-out) Power connection piece 40 through welding.
  • the positive electrode (negative electrode) of the first unit cell 20 passes through the power connection piece 40 and the negative electrode of the soft pack unit cell 11 at one end of the soft pack battery 10.
  • the (positive) electrical connection thereby causes the first single cell 20 to be connected in series with the soft pack battery 10, and the soft pack cells 10 are formed in series or in parallel by the conductive connectors 50 between the soft pack cells 11.
  • the electrodes of the soft pack cells 11 at the two ends of the soft pack battery 10 are electrically connected to the first unit cells 20 through the power connection piece 40, respectively. Thereby, the series connection of the soft pack battery 10 and the two first unit cells is completed in the series circuit.
  • the soft pack single cell 11 at the end of the soft pack battery 10 can also be electrically connected to the positive electrode of the battery pack or the positive electrode of the battery pack through the power connection piece 40, thereby completing the soft
  • the battery pack 10 is connected in series with the battery pack 60, wherein the battery pack 60 is composed of a plurality of the first single cells 20 in parallel; according to the battery system provided by the present disclosure, when the soft pack battery 10 includes a plurality of series or parallel connections
  • the first unit battery 20 may be connected in series to the intermediate portion of the soft pack battery 10, or the battery pack 60 may be connected in series to the intermediate portion of the soft pack battery 10.
  • current interrupting device 30 can be disposed at any suitable location on cover plate 22.
  • the current interrupting device 30 may be mounted on one of the electrode outer terminals 23 of the first unit cell 20, and a part of the power connecting piece 40. Covering the current interrupting device 30, the other portion is extended.
  • the reliability of the current interrupt device is critical, that is, the current interrupt device needs to respond quickly.
  • the current interrupting devices in the various embodiments are all mechanical structures that sense air pressure.
  • the current interrupting devices are in gas communication with the internal cells of the unit cells and are capable of breaking the single cells under the action of air pressure.
  • the transfer of current can be interrupted by disconnecting the internal components to cut off the charge and discharge of the cells in time.
  • the source of the air pressure utilized is: when an abnormal state such as when the single cell is overcharged, a gas is generated inside the single cell, which causes the air pressure inside the outer casing to rise, or when the single battery is abnormal during use.
  • the current interrupting device 30 has a scoring member 31 and a flip member 32 connected to the scoring member 31 to be electrically connected to each other, and the flip member 32 and the scoring member 31 It is possible to disconnect the electrical connection under the action of air pressure.
  • the breaking of the structure itself can be achieved by machining a weak score on the respective component to effect the breaking of the electrical connection, which in some embodiments is formed on the score member 31. Trace 311. That is, under the action of the internal air pressure, the indentation 311 can be broken by the inversion operation of the inverting member 32 to achieve the disconnection of the electrical connection, thereby achieving the purpose of cutting off the current.
  • the present disclosure provides a scoring member for a current interrupting device, the scoring member 31 including a scored area 312 formed with a score 311 for electrically interconnecting the flip member 32. a first pad 313, and a second pad 314 for electrically connecting to the terminal in the electrode, the flip member 32 is capable of acting under the action of air pressure to electrically disconnect the scoring member 31 by breaking the scoring 311, and flipping After the piece 32 breaks the score 311, the flip member 32 is electrically disconnected from the second land 314, thereby being electrically disconnected from the electrode inner terminal 24, wherein in the present disclosure, the score 311 surrounds the first land 313.
  • the score 311 may be an annular shape surrounding the first weld zone 313, and at least one of the first weld zone 313 and the second weld zone 314 is disposed opposite the score 311. That is, the plane in which the score 311 is located and the first land 313 and/or the second land 314 are not in one plane, so that the mechanical force of the external force transmitted by the flip member 32 on the score 311 on the score member 31 can be effectively eliminated.
  • the impact, and also the thermal influence of the welding stress of the first land 313 and the second land 314 on the region where the score 311 is located can also be eliminated. Thereby the reliability of the current interrupting device provided by the present disclosure is improved.
  • the score 311 around the first land 313 can be broken under the action of the internal air pressure of the battery, and the electrical connection between the flip member 32 and the score member 31 is broken as a whole to interrupt the current.
  • the score 311 is disposed opposite to the first land 313 and the second land 314, that is, the plane where the score 311 is located and the first land 313 are not in the same plane and the score 311 is located.
  • the plane and the second land 314 are also not in the same plane; more preferably, the score member 31 includes a scored area 312 and a boss 106 projecting from the scored area 312, the first land 313 being formed in the On the boss 315, a score 311 is formed on the scored area 312 and disposed around the boss 315, thereby realizing the plane where the score is located and the plane where the first land is located and the location where the score and the second land are located A planar facet; in some embodiments, the first land 313 is formed by the upper surface of the boss 315 and parallel to the score region 312, and the outer periphery of the upper surface is provided with a ring weld.
  • the second lands 314, the nicks 312, and the first lands 313 are arranged in the radial direction from the outside to the inside, and are formed from the outside to the inside to gradually approach the flip.
  • the step structure of the member 32, the second weld zone 314 is also different from the scored zone 312, and the step structure formed by the three has a buffering function, which can avoid the thermal influence of the welding stress of the two weld zones on the score 311, and can also Buffering the external force transmitted from the terminal inside the electrode makes the current interrupting device more reliable.
  • the scoring member 31 includes a scored area 312 and a boss 315 protruding from the scored area 312, the first land 313 being formed in the convex On the stage 315, a score 311 is formed on the scored area 312 and disposed around the boss 315.
  • the first land 313 is formed by the upper surface of the boss 315 and parallel to the score region 312, and the outer periphery of the upper surface is provided with a ring-shaped solder joint .
  • the first connection region 321 on the flip member 32 may be formed to receive the connection hole of the boss 315.
  • the boss 315 may be a cylindrical structure, or a through hole may be disposed in the axial direction of the cylindrical structure, as shown in FIG. 4; in other embodiments, it may also be realized by various convex or concave structures. The different faces of the two areas.
  • the tip end of the electrode inner terminal 24 is provided with a receiving groove, and for this, the outer peripheral edge of the notch region 312 is formed with a boss.
  • the soldering zone 313 is shaped to fit the groove wall of the receiving groove of the electrode terminal 24 and is welded by the annular solder joint, and in this embodiment, the notch 31 can be completely accommodated in the receiving groove of the electrode inner terminal 24, The structure is stable.
  • the inner terminal 24 of the electrode is still provided with a receiving groove, and the boss 315 of the scoring member 31 extends out of the receiving groove.
  • the notch region 312 The outer circumference is formed with a ring wall 316 which is oppositely protruded from the boss 315, and the second land 314 is formed on the outer circumference of the ring wall 316 and is parallel to the notch area 312, so that the scoring member 31 is formed as the step structure described above.
  • the outer periphery of the second land 314 is formed with an annular solder joint for electrical connection with the electrode inner terminal 24 of the battery, and in some embodiments, the lower surface of the second land 314 may be placed on the bottom wall of the receiving groove The outer peripheral edge is welded to the side wall of the receiving groove by a ring-shaped solder joint, and the structure is also stable.
  • the side walls of the boss 315 and the ring wall 316 are perpendicular to the scored area 312, respectively, and may be angled in other embodiments, such as forming a zigzag step.
  • the first lands 313, the nicks 312, and the second lands 314 may each have an annular structure, that is, the first lands 313 have a central hole. In other embodiments, the first lands 313 may not have Center hole.
  • the scoring member 31 of the two embodiments has been described above, and the flip member 32 of the two embodiments will be described below.
  • the flip member 32 is formed with a first connection region 321 for electrically connecting with the scoring member 31 and a second connection region 322 for electrically connecting to the electrode outer terminal 23 of the battery. Further, the flip member 32 is further deformed.
  • the buffer 323, the deformation buffer 323 is disposed between the first connection area 321 and the second connection area 322, and is disposed around the first connection area 321.
  • the deformation buffer means that the area can be deformed prior to the flip member 32 itself, the first connection region 321, the second connection region 322, and the score member 31 by an external force, thereby buffering the external force. Then, the impact of the external force on the first joint region 321 and the score 311 on the score member 31 is alleviated, and the reliability of the current interrupting device is improved.
  • the inverting member 32 is a sheet-like structure forming a taper shape, and the small end of the taper is formed as a first connecting portion 321 , the big end is away from the scoring member 31 and formed as a second Connection area 322.
  • the tapered structure can dispose the two connecting regions differently and can provide a space for the flip member 32 to be turned upside down to break the score 311.
  • the flip member may also be a flat member having elasticity or the like.
  • the deformation buffer 323 in the present disclosure is formed as an annular groove structure surrounding the first connection region 321.
  • the deformation buffer can be achieved by the relative movement between the groove walls of the annular groove.
  • the deformation buffer 323 can also be realized by a structure such as a deformation chamber or an elastic material.
  • the annular groove structure has an arcuate cross section, for example, a semicircular shape that protrudes toward the electrode outer terminal 23.
  • the external force transmitted from the second connection region 322 can be absorbed by the deformation of the arcuate groove wall, which in turn reduces the impact on the first connection region 321 and the score member 31.
  • the radial cross section of the annular groove structure may also be an angular shape, such that the two sides of the angular shape are two groove walls, and can also be deformed by an external force.
  • the boss 315 of the scoring member 31 protrudes from the receiving groove of the terminal in the electrode.
  • the annular groove can be designed to face the incision member. 31 is protruded, and the groove bottom is formed on one side of the boss, so that the flip member 32 as a whole can be formed in a Z-like structure to achieve buffering of external force.
  • a support ring 26 is sealingly connected between the lower side of the outer periphery of the flip member 32 and the cover plate 22,
  • the outer peripheral edge of the electrode outer terminal 23 is electrically connected to the upper side of the outer peripheral edge of the flip member 32, so that gas generated from the inside of the battery can act on the flip member 32 without leaking.
  • the electrode outer terminal 23 is formed into a cap structure and may be formed with a through hole 231 for discharging gas when the flip member 32 is actuated, thereby avoiding the reverse flipper action under the action of air pressure.
  • the support ring 26 may be supported by an insulating material or a conductive material.
  • the support ring 26 can be a ceramic ring to insulate the cover plate 22 from being charged.
  • the inner wall of the support ring 26 is formed with a support flange 261, and the outer periphery of the flip member 32 and the electrode outer terminal 23 is supported on the upper surface of the support flange 261 to ensure stable operation of the current interrupting device.
  • the first unit cell provided by the present disclosure further includes a housing, the battery core is housed in the housing, the first unit battery further includes a cover assembly of the package housing, wherein the electrode inner terminal is electrically connected to the battery core, and the flip member
  • the cover assembly includes a cover plate, an electrode inner terminal 213 located inside the cover plate, and an electrode outer terminal 214 located outside the cover plate, and the electrode inner terminal 213 and the electrode outer terminal 214 pass the above
  • the current interrupting device is electrically connected, the electrode outer terminal 214 is electrically connected to the inverting member 222, and the scoring member 221 is electrically connected to the electrode inner terminal 213.
  • the electrode inner terminal 213 is soldered to the inner lead-out member electrically connected to the battery core.
  • the inner lead-out member can be formed with a soldering hole, and the inner electrode terminal 213 is formed into a columnar structure and embedded in the soldering hole to be inserted into the inner lead-out member. welding.
  • a cover insulating member is disposed between the cover plate and the inner lead-out member, and the inner terminal of the motor can pass through the cover insulating member with a gap to be welded with the scored member, and in order to ensure the sealing property,
  • the support ring is included, and the lower end of the support ring is welded on the cover plate, wherein ceramic is used as the material to ensure the insulation of the current interrupting device and the cover plate, and a hole is formed in the cover plate to facilitate the installation of the current interrupting device.
  • the inner lead member is formed with air holes through which the gas can be applied to the flip member 222.
  • a battery system comprising at least one series circuit, wherein the series circuit is provided with a soft pack battery and at least one first unit battery connected in series with the soft pack battery, and the first unit battery is provided with a current interrupting device; the current interrupting device of the first single cell is configured to disconnect an internal current of the first single cell when an abnormality occurs in at least one of the soft pack battery and the first single cell.
  • the series circuit includes a plurality of first single cells connected in series with the soft pack battery, and the plurality of first single cells are sequentially connected in series or in series in series.
  • the series circuit includes a plurality of first single cells connected in series with the soft pack battery, and the plurality of first single cells are connected in parallel to form a battery pack in series with the soft pack battery.
  • the first unit cell includes a housing, a battery core housed in the housing, a cover plate enclosing the housing, an electrode inner terminal located inside the cover plate, and the cover plate
  • the outer electrode outer terminal is electrically connected to the battery core
  • the current interrupting device is disposed on the cover plate and electrically connected to the electrode outer terminal and the electrode inner terminal, respectively.
  • the outer casing is one of an aluminum casing, a steel casing, and a plastic casing, and the outer casing has a thickness of 0.4 mm to 1.5 mm.
  • the current interrupting device includes a scoring member electrically connected to the electrode inner terminal, and a flip member respectively surrounding the scoring member and the electrode The terminal is electrically connected and in gas communication with the interior of the first unit cell.
  • the indentation member includes a scored region formed with a score, a first weld zone for electrically interconnecting the flip member, and a second weld zone for electrically connecting to the electrode inner terminal
  • the inverting member is capable of acting under the action of air pressure to break the indentation, and the inverting member may be electrically disconnected from the inner terminal of the electrode after the indentation is broken, the scoring being disposed around the first welding zone And at least one of the first weld zone and the second weld zone is disposed opposite to the score.
  • the score is disposed opposite the first weld zone and the second weld zone.
  • the scoring member is formed with a boss protruding from the scoring region, the first land is formed by the upper surface of the boss and parallel to the scoring region, and The outer periphery of the upper surface is provided with a ring-shaped solder joint.
  • the outer periphery of the scored region is formed with a ring wall projecting in the same direction as the boss, the upper edge of the ring wall being aligned with the upper edge of the boss in the height direction, And the outer wall of the ring wall is for electrically connecting to the inner terminal of the electrode.
  • the second weld zone, the scored zone, and the first weld zone are arranged in a radial direction from the outside to the inside, and are formed from the outside to the inside to gradually approach the stepped structure of the flip member,
  • the score is disposed around the first weld zone.
  • an outer circumference of the scored region is formed with a ring wall that is convexly protruding from the boss, and the second land is formed on an outer circumference of the ring wall and is nicked The regions are parallel, and the outer periphery of the second land is formed with a ring-shaped solder joint.
  • the sidewalls of the boss and the ring wall are perpendicular to the scored region, respectively.
  • the first weld zone, the score zone, and the second weld zone are each formed in a ring structure.
  • the flip member is formed with a first connection region for electrically connecting to the scoring member and a second connection region for electrically connecting to the electrode outer terminal, the flip member further A deformation buffer is formed, and the deformation buffer is disposed in the first connection area.
  • the inverting member is a sheet-like structure forming a taper shape, the small end of the taper being formed as the first connecting region, and the large end being formed as the second connecting portion away from the scoring member .
  • the deformation buffer is formed as an annular groove structure surrounding the first connection region.
  • the annular groove structure has a radial cross section that is curved or angled.
  • a support ring is sealingly connected between the lower side of the outer periphery of the inverting member and the cover plate, and an outer circumference of the electrode outer terminal is electrically connected to an upper side of the outer circumference of the inverting member.
  • an inner wall of the support ring is formed with a support flange, and an outer periphery of the flip member and the electrode outer terminal is supported on an upper surface of the support flange.
  • the present disclosure also provides an electric vehicle including the battery system as described above.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

一种电池系统及电动汽车，电池系统包括至少一条串联回路，所述串联回路中设置有软包电池和至少一个与所述软包电池串联连接的第一单体电池，在所述第一单体电池上设置有电流中断装置；所述第一单体电池的电流中断装置用于，在所述软包电池、第一单体电池中的至少一个出现异常时断开该第一单体电池的内部电流。

Description

电池系统及电动汽车
相关申请的交叉引用
本申请要求比亚迪股份有限公司于2017年12月13日提交的、发明名称为“电池系统及电动汽车”的中国专利申请号“201711330171.0”的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及电池领域，涉及一种电池系统及电动汽车。
背景技术
近年来，在全球环境污染和石油能源紧缺的背景下，电动汽车应运而生。作为电动汽车主要动力来源的电池，软包电池因具有体积小、重量轻、比能量高、安全性高等多种优点已广泛应用于电动汽车中。
然而，软包电池在充电过程中容易出现过充等异常现象而引发软包电池爆炸等问题。
发明内容
本公开的目的是提供一种电池系统及电动汽车，以解决软包电池过充的技术问题。
为了实现上述目的，本公开提供一种电池系统，包括至少一条串联回路，所述串联回路中设置有软包电池和与至少一个所述软包电池串联连接的第一单体电池，在所述第一单体电池上设置有电流中断装置；所述第一单体电池的电流中断装置用于，在所述软包电池、所述第一单体电池中的至少一个发生异常时断开该第一单体电池的内部电流。
在一些实施例中，所述串联回路中包括多个与所述软包电池串联连接的第一单体电池，所述多个第一单体电池之间依次串联或间隔串联连接。
在一些实施例中，所述串联回路中包括多个与所述软包电池串联连接的第一单体电池，多个所述第一单体电池并联组成一电池组与所述软包电池串联。
在一些实施例中，所述第一单体电池包括外壳、容纳在所述外壳内的电芯、封装所述外壳的盖板、位于所述盖板内侧的电极内端子以及位于所述盖板外侧的电极外端子，所述电极内端子与所述电芯电连接，所述电流中断装置设置在所述盖板上且分别与所述电极外端子和所述电极内端子电连接。
在一些实施例中，所述外壳为铝壳、钢壳、塑料壳中的一种，所述外壳的厚度为0.4mm-1.5mm。
在一些实施例中，所述电流中断装置包括刻痕件和翻转件，所述刻痕件电连接在所述电极内端子上，所述翻转件分别与所述刻痕件和所述电极外端子电连接且与所述第一单体电池的内部气体连通。
在一些实施例中，所述刻痕件包括形成有刻痕的刻痕区、用于与翻转件相互电连接的第一焊接区以及用于与所述电极内端子电连接的第二焊接区，所述翻转件能够在气压作用下动作以拉断所述刻痕，所述刻痕围绕所述第一焊接区设置，并且所述第一焊接区、第二焊接区中的至少一个与所述刻痕异面设置。
在一些实施例中，所述刻痕与第一焊接区和第二焊接区异面设置。
在一些实施例中，所述刻痕件上形成有从该刻痕区凸出的凸台，所述第一焊接区由所述凸台上表面形成并且与所述刻痕区平行，并且该上表面的外周缘设置有环形焊点。
在一些实施例中，所述刻痕区的外周缘形成有与所述凸台同向凸出的环壁，所述环壁的上边缘与所述凸台的上边缘在高度方向上对齐，并且该环壁的外壁用于与所述电极内端子电连接。
在一些实施例中，所述第二焊接区、所述刻痕区、所述第一焊接区沿径向从外向内依次布置，并且从外向内形成为逐渐接近所述翻转件的台阶结构，所述刻痕围绕所述第一焊接区设置。
在一些实施例中，所述刻痕区的外周缘形成有与所述凸台反向凸出的环壁，所述第二焊接区形成在所述环壁的外周缘并与所述刻痕区平行，所述第二焊接区的外周缘形成有环形焊点。
在一些实施例中，所述凸台的侧壁与所述环壁分别与所述刻痕区垂直。
在一些实施例中，所述第一焊接区、所述刻痕区和所述第二焊接区分别形成为环状结构。
在一些实施例中，所述翻转件上形成有用于与所述刻痕件电连接的第一连接区和用于与所述电极外端子电连接的第二连接区，所述翻转件上还形成有变形缓冲区，所述变形缓冲区设置在所述第一连接区。
在一些实施例中，所述翻转件为形成锥形的片状结构，该锥形的小端形成为所述第一连接区，大端远离所述刻痕件形成为所述第二连接区。
在一些实施例中，所述变形缓冲区形成为围绕所述第一连接区的环形槽结构。
在一些实施例中，所述环形槽结构的径向截面为弧形或角型。
在一些实施例中，所述翻转件的外周缘下侧与所述盖板之间密封连接有支撑环，所述电极外端子的外周缘电连接在所述翻转件的外周缘上侧。
在一些实施例中，所述支撑环的内壁形成有支撑凸缘，所述翻转件和所述电极外端子 的外周缘支撑在所述支撑凸缘的上表面。
本公开还提供一种电动汽车，包括本公开提供的电池系统。
通过上述技术方案，通过在串联回路中设置至少一个与软包电池串联连接的第一单体电池并且在第一单体电池上设置电流中断装置，可以避免软包电池在充电过程中因出现过程等异常而引起爆炸，提高软包电池工作的安全性。
本公开的其他特征和优点将在随后的具体实施方式部分予以详细说明。
附图说明
附图是用来提供对本公开的进一步理解，并且构成说明书的一部分，与下面的实施方式一起用于解释本公开，但并不构成对本公开的限制。在附图中：
图1是本公开的一种实施方式的电池系统的结构示意图，其中，第一单体电池上的电流中断装置没有启动，串联回路呈正常工作状态；
图2是本公开的一种实施方式的电池系统的结构示意图，其中，第一单体电池上的电流中断装置正常启动，串联回路呈断路状态；
图3是本公开的另一种实施方式的电池系统的结构示意图，其中，第一单体电池上的电流中断装置没有启动，串联回路呈正常工作状态；
图4是本公开的另一种实施方式的电池系统的结构示意图，其中，第一单体电池上的电流中断装置正常启动，串联回路呈断路状态；
图5是本公开的另一种实施方式的电池系统的结构示意图，其中，电池组中的其中一个第一单体电池上的电流中断装置误启动，串联回路依然呈正常工作状态；
图6是本公开的一种实施方式的电池系统的部分分解立体示意图；
图7是本公开的一种实施方式的电池系统的部分分解立体示意图；
图8是本公开的另一种实施方式的电池系统的部分分解立体示意图；
图9是本公开的另一种实施方式的电池系统的部分分解立体示意图；
图10是本公开第一实施方式的电流中断装置的剖视图；
图11是本公开第二实施方式的电流中断装置的剖视图；
图12是本公开基于第二实施方式提供的一种刻痕件的立体结构示意图；
图13是本公开基于第一实施方式提供的一种翻转件的立体结构示意图。
附图标记说明
10软包电池；11软包单体电池；20第一单体电池；21外壳；22盖板；23电极外端子；；231通孔；24电极内端子；26支撑环；261支撑凸缘；30电流中断装置；31刻痕件；311 刻痕；312刻痕区；313第一焊接区；314第二焊接区；315凸台；316环壁；32翻转件；321第一连接区；322第二连接区；323变形缓冲区；40动力连接片；50导电连接件；60电池组。
具体实施方式
以下结合附图对本公开的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本公开，并不用于限制本公开。
在本公开中，在未作相反说明的情况下，使用的方位词如“上、下、左、右”通常是以相应附图的图面方向为基准定义的，“内、外”是指相应部件轮廓的内和外。
图1至图9是本公开的一种电池系统的结构示意图，图10和图11是本公开提供的一种电流中断装置的结构示意图，图12是本公开提供的一种刻痕件，图13是本公开提供的一种翻转件。如图1至图5所示，该电池系统包括至少一条串联回路，该串联回路中设置有软包电池10和至少一个与该软包电池10串联连接的第一单体电池20，并且在该第一单体电池20上设置有电流中断装置30。其中，所述第一单体电池20上的电流中断装置30用于在串联回路中的某个电池或某几个电池出现异常时，断开该第一单体电池20的内部电流从而断开整个串联回路。某个电池或某几个电池指，软包电池10和第一单体电池20中的至少一个。
在本公开的一种实施方式中，软包电池10可以包括1个软包单体电池11，也可以包括多个软包单体电池11，该多个软包单体电池11可以是多个串联连接的软包单体电池11、或多个并联连接的软包单体电池11，或多个串联连接和并联连接的软包单体电池11，软包单体电池11包括软包电芯和与软包电芯串联连接的电极，该软包单体电池11的外壳为铝塑膜。
本公开中，串联回路中可以包括一个与软包电池10串联连接的第一单体电池20；也可以包括多个与软包电池10串联连接的第一单体电池，该多个第一单体电池20可以是相互并联组成电池组(如图3至图5所示的电池组60)后与软包电池10串联；也可以是该多个第一单体电池20相互之间依次串联之后与软包电池10串联；本方案中，还可以是该多个第一单体电池20与多个软包单体电池11间隔串联在串联回路中。
本公开中，第一单体电池20可以包括外壳21、容纳在外壳内的电芯、封装外壳21的盖板22、位于盖板22内侧的电极内端子24和位于盖板22外侧的电极外端子23。其中，电极内端子24与电芯电连接，电极外端子23可以通过各种电极引出件40完成电流的输入和输出。电流中断装置30可以设置在盖板上且分别与电极外端子23和电极内端子24电连接，以可以控制电极端子的电流的输入和输出；在一些实施例中，所述外壳为铝壳、钢壳、 塑料壳中的一种，所述外壳的厚度为0.4mm-1.5mm。
在一些实施例中，如图1所示，电流中断装置30在不启动状态下为电芯与电极端子导通的状态，即电极外端子23和电极内端子24之间的电连接正常，可正常进行电流的输入和输出，以完成电池系统的充放电工作。
如图2所示，当串联回路中的某个或某几个出现异常时，该第一单体电池20受热温度升高，电池内部气压增大，促使设置在该第一单体电池20上的电流中断装置30启动，将电极外端子23和电极内端子24之间的电连接断开，进而中断电极端子的电流输入和电流输出，致使串联回路处于断路状态，从而防止电池系统出现热失控。
值得说明的是，图1和图2仅以电池系统包括一条串联回路且该串联回路中仅设置一个第一单体电池为例示意。在本公开的其他实施方式中，该电池系统还可以具有多条串联回路，每条串联回路中还可以设置多个第一单体电池，多个第一单体电池可以串联在串联回路的任意位置，多个第一单体电池也可以并联组成电池组与软包电池串联。
例如，图3至图5以两个第一单体电池并联组成电池组60与软包电池10串联示意，如图3所示，当串联回路处于正常状态时，电池组60的各个第一单体电池20中的电流中断装置30均不工作，此时各个第一单体电池20的电极内端子24和电极外端子23电连接正常，即各个第一单体电池20内部电流导通，此时整个串联回路正常。
如图4所示，当串联回路中的某个电池或某几个电池出现异常时，将触发电池组60的第一单体电池20中的电流中断装置30开启，使得第一单体电池20(第一单体电池Cn(a)和Cn(b))的内部均处于断开状态，进而致使整个串联回路呈断路状态，从而避免软包电池10过充，实现对软包电池10的保护。
如图5所示，当电池组60中的某个第一单体电池20上的电流中断装置30(如第一单体电池Cn(b)上的电流中断装置)异常开启时，该第一单体电池Cn(b)的内部电流断开，但另一与之并联的第一单体电池Cn(a)的内部电流仍处于导通状态，因而串联回路保持正常工作状态，仅容量减少。由此，可以降低电流中断装置异常开启而导致串联回路断电的风险，使得基于该电池系统的外部控制系统有足够的应急时间进行相关处理。
在本公开中，如图6至图9所示，软包电池10可以包括一个或多个软包单体电池11，当软包电池10包括多个软包单体电池11时，所述多个软包单体电池11通过导电连接件50串联连接，或所述多个软包单体电池11通过导电连接件50并联连接，或所述多个软包单体电池11导电连接件50串联和并联连接，每个软包单体电池11包括软包电芯和与软包电芯电连接的电极，两相邻软包单体电池之间的电极通过导电连接件50串联或并联。
本公开中，软包电池10中的一个软包单体电池11与第一单体电池20或与电池组60串联，或者软包电池10中的多个软包单体电池11分别与多个第一单体电池20或多个电池 组60串联，在一些实施例中可以为通过动力连接片40将软包电池10中的一个软包单体电池11的正极(负极)与第一单体电池20的负极(正极)焊接形成串联或者将软包电池10中的一个软包单体电池11的正极(负极)与电池组的负极引出(正极引出)焊接形成串联，该与第一单体电池20或电池组串联连接的软包单体电池11可以位于软包电池10的端部，也可以位于软包电池10的中间部位；根据本公开，将软包电池10位于一侧或两侧端部的软包单体电池11的正极(负极)与第一单体电池20的负极(正极)通过动力连接片40焊接或者将软包电池10位于一侧或两侧端部的软包单体电池11的正极(负极)与电池组的负极引出(正极引出)通过动力连接片40焊接。
作为一种实施方式，如图6和图7所示，第一单体电池20的正极(负极)通过动力连接片40与软包电池10的一侧端部的软包单体电池11的负极(正极)电连接由此使得第一单体电池20与软包电池10形成串联连接，软包单体电池11之间通过导电连接件50串联或并联形成软包电池10。
作为另一种实施方式，如图8和图9所示，软包电池10的两侧端部的软包单体电池11的电极分别与第一单体电池20通过动力连接片40电连接，由此在所述串联回路中完成软包电池10与2个第一单体电池的串联连接。
根据本公开提供的电池系统，所述软包电池10的端部的软包单体电池11也可以通过动力连接片40与电池组的正极引出或电池组的正极引出电连接，由此完成软包电池10与电池组60的串联，其中电池组60由多个所述第一单体电池20并联组成；根据本公开提供的电池系统，当所述软包电池10包括多个串联或并联连接的软包单体电池时，第一单体电池20可以串联连接在软包电池10的中间部位，也可以是将电池组60串联连接在软包电池10的中间部位。
在本公开中，电流中断装置30可以设置在盖板22上的任意适当位置。在一些实施例中，作为一种实施方式，如图6至图9所示，电流中断装置30可以安装在第一单体电池20的其中一个电极外端子23上，且动力连接片40的一部分覆盖在电流中断装置30上，另一部分伸出。
作为重要的安全措施，电流中断装置的可靠性至关重要，即需要电流中断装置可以快速响应。
在本公开中，各实施方式中的电流中断装置均为感应气压的机械结构，在一些实施例中，电流中断装置与单体电池的内部气体连通并能够在气压作用下作用断开单体电池的内部电流。在一些实施例中，可以通过断开内部的部件连接来中断电流的传递，从而及时切断单体电池的充放电。其中所利用的气压来源为：当例如单体电池出现过充时等异常状态时，单体电池内部会产生气体继而使得外壳内部的气压升高，或者当单体电池在使用过程 中出现异常导致其温度升高而使得单体电池内部气压升高，从而产生驱动电流中断装置的气压动力。
以图10和图11所示的实施方式为例，该电流中断装置30具有刻痕件31和与该刻痕件31相连以相互电连接的翻转件32，并且翻转件32与刻痕件31能够在气压作用下断开电连接。在本公开的实施方式中，可以通过在相应部件上加工出薄弱的刻痕来实现本身结构的断开，从而实现电连接的断开，在一些实施例中在刻痕件31上形成有刻痕311。即，在内部的气压作用下，通过翻转件32的翻转动作可以拉断刻痕311而实现二者电连接的断开，从而实现切断电流的传递的目的。
之所以采用这种方式，是考虑由于在例如动力电池的领域中，需要通过的电流较大，因此需要保证刻痕件31和翻转件32的焊接结构稳定，避免大电流熔断焊接结构。这样通过刻痕件31的刻痕311的设置，即在相应部分加工出强度小于其他区域的薄弱部，就可以完成刻痕件31和翻转件32的完全断开，刻痕通常为围绕刻痕件和翻转件的焊接区设置，以保证二者的完全断开。
下面结合图10和图11介绍本公开两种实施方式中的刻痕件31和翻转件32。
如图10和图11所示，本公开提供一种电流中断装置的刻痕件，该刻痕件31上包括形成有刻痕311的刻痕区312，用于与翻转件32相互电连接的第一焊接区313，以及用于与电极内端子电连接的第二焊接区314，翻转件32能够在气压作用下动作以通过拉断刻痕311而与刻痕件31断开电连接，翻转件32拉断刻痕311后，翻转件32与第二焊接区314断开电连接，进而与电极内端子24断开电连接，其中，在本公开中，刻痕311围绕第一焊接区313设置，刻痕311可以为环绕第一焊接区313的环形，并且第一焊接区313和第二焊接区314中的至少一个与刻痕311异面设置。即，刻痕311所在的平面和第一焊接区313和/或第二焊接区314不在一个平面，这样能够有效消除由翻转件32传递来的外力对刻痕件31上的刻痕311的机械冲击，并且还能够消除第一焊接区313以及第二焊接区314的焊接应力对刻痕311所在区域的热影响。从而提升本公开提供的电流中断装置的可靠性。而围绕第一焊接区313的刻痕311在电池内部气压的作用下可以断开，此时将整体断开翻转件32和刻痕件31的电连接而起到电流中断的作用。
如图10和图11所示，刻痕311与第一焊接区313和第二焊接区314异面设置，即刻痕311所在的平面和第一焊接区313不在同一个平面并且刻痕311所在的平面和第二焊接区314也不在同一个平面；更有选地，刻痕件31包括刻痕区312和从该刻痕区312凸出的凸台106，第一焊接区313形成在所述凸台315上，刻痕311形成在所述刻痕区312上并且围绕所述凸台315设置，从而实现刻痕所在平面与第一焊接区所在的平面以及刻痕与第二焊接区所在的平面的异面；在一些实施例中，所述第一焊接区313由所述凸台315上表 面形成并与所述刻痕区312平行，并且该上表面的外周缘设置有环形焊点。
如图11和图12所示，在第二实施方式中，第二焊接区314、刻痕区312，第一焊接区313沿径向从外向内依次布置，并且从外向内形成为逐渐接近翻转件32的台阶结构，第二焊接区314也与刻痕区312异面，并且三者构成的台阶结构具有缓冲作用，能够避免两个焊接区的焊接应力对刻痕311的热影响，也能够缓冲从电极内端子方向传递来的外力，使得电流中断装置更加可靠。
在本公开的两个实施方式中，如图10或图11所示，刻痕件31包括刻痕区312和从该刻痕区312凸出的凸台315，第一焊接区313形成在凸台315上，刻痕311形成在刻痕区312上并且围绕凸台315设置。从而实现二者的所在区域的异面，在一些实施例中，第一焊接区313由凸台315的上表面形成并与刻痕区312平行，并且该上表面的外周缘设置有环形焊点。对应地，翻转件32上的第一连接区321可以形成为容纳该凸台315的连接孔。从而通过环形焊点将凸台315的外周缘和连接孔的内壁牢固焊接。其中凸台315可以为圆柱状结构，也可以在圆柱状结构的轴向方向上设置通孔，如图4所示；在其他实施方式中，还可以通过各种凸起或凹入的结构实现二者区域的异面设置。
如图10所示，在第一实施方式中，为了和电池的电极内端子24电连接，通常电极内端子24的顶端设置容纳槽，为此，刻痕区312的外周缘形成有与凸台315同向凸出的环壁316，环壁316的上边缘与凸台315的上边缘在高度方向上对齐，并且该环壁的外壁用于与电池的电极内端子24电连接以形成第一焊接区313，与电极内端子24的容纳槽的槽壁形状配合并且通过环形焊点进行焊接，并且在这种实施方式中，刻痕件31可以完全容纳进入电极内端子24的容纳槽中，结构稳固。
如图11所示，在第二实施方式中，电极内端子24上仍然设置容纳槽，而刻痕件31的凸台315则伸出该容纳槽，在一些实施例中，刻痕区312的外周缘形成有与凸台315反向凸出的环壁316，第二焊接区314形成在环壁316的外周缘并与刻痕区312平行，以使得刻痕件31形成为上述的台阶结构，其中第二焊接区314的外周缘形成有用于与电池的电极内端子24电连接的环形焊点，在一些实施例中，第二焊接区314的下表面可以放置于容纳槽的底壁上，而外周缘与容纳槽的侧壁通过环形焊点焊接，同样结构稳固。
其种在第二实施方式中，如图11所示，凸台315的侧壁和环壁316分别与刻痕区312垂直，在其他实施方式还可以具有一定角度，例如形成Z字型台阶。此外，第一焊接区313、刻痕区312和第二焊接区314可以分别为环状结构，即第一焊接区313具有中心孔，在其他实施方式中，第一焊接区313也可以不具有中心孔。
上述介绍了两种实施方式中的刻痕件31，下面介绍两种实施方式中的翻转件32。
其中，翻转件32上形成有用于与刻痕件31电连接的第一连接区321和用于与电池的 电极外端子23电连接的第二连接区322，此外翻转件32上还形成有变形缓冲区323，变形缓冲区323设置在第一连接区321和第二连接区322之间，并且围绕第一连接区321设置。其中变形缓冲区是指在外力作用下该区域可以先于翻转件32本身、第一连接区321、第二连接区322以及刻痕件31本身进行变形，从而缓冲该外力。继而减缓外力对于第一连接区321、以及刻痕件31上刻痕311的冲击，提升电流中断装置的可靠性。
其中，在本公开的两种实施方式中，翻转件32为形成锥形的片状结构，该锥形的小端形成为第一连接区321，大端远离刻痕件31并形成为第二连接区322。该锥形结构可以将两个连接区异面设置，并且能够提供翻转件32受力向上翻转的空间，以拉断刻痕311。在其他可能的实施方式中，翻转件还可以为具有弹性的平面件等。
如图10和图11所示，本公开中的变形缓冲区323形成为围绕第一连接区321的环形槽结构。这样在外力作用下，通过环形槽的槽壁之间的相对运动能够实现变形缓冲的作用。在其他可能的实施方式中，变形缓冲区323还可以通过变形腔室等结构或弹性材料实现。
如图10和图13所示，在第一实施方式中，环形槽结构的径向截面为弧形，例如朝向电极外端子23凸出的半圆形。这样，从第二连接区322传动来的外力可以通过弧形的槽壁的变形来吸收，继而减少对第一连接区321和刻痕件31的冲击。
如图11所示，在第二实施方式中，环形槽结构的径向截面还可以为角型，这样角型的两边为两个槽壁，同样可以在外力的作用下变形。在一些实施例中，在第第二实施方式中刻痕件31的凸台315凸出于电极内端子的容纳槽，此时为了节省空间，可以设计该角型的环形槽可以朝向刻痕件31凸出，并且槽底形成在凸台的一侧，这样翻转件32整体可以形成为Z状结构，以实现对外力的缓冲。
如图10和图11所示，在本公开的两个实施方式中，为了保证能够被电池内部的气体作用，翻转件32的外周缘下侧与盖板22之间密封连接有支撑环26，电极外端子23的外周缘电连接在翻转件32的外周缘上侧，这样从电池内部产生的气体可以作用在翻转件32上而不会外泄。而为了能够使得翻转件32正常动作，电极外端子23形成为盖帽结构并且可以形成有通孔231，以用于在翻转件32动作时排出气体，从而避免在气压作用下反正翻转件动作。另外在盖板22带电和绝缘两种实施方式中，支撑环26可以选择绝缘材料或者导电材料支撑。通常地，支撑环26可以为陶瓷环以使得盖板22绝缘而不带电。在一些实施例中，支撑环26的内壁形成有支撑凸缘261，翻转件32和电极外端子23的外周缘支撑在支撑凸缘261的上表面，以保证电流中断装置的稳定工作。
本公开提供的第一单体电池，还包括外壳，所述电芯容纳在外壳内，该第一单体电池还包括封装外壳的盖板组件，其中电极内端子与电芯电连接，翻转件与外壳的内部气体连通；所述盖板组件包括盖板、位于该盖板内侧的电极内端子213和位于该盖板外侧的电极 外端子214，电极内端子213和电极外端子214通过上述的电流中断装置电连接，电极外端子214与翻转件222电连接，刻痕件221电连接在电极内端子213上。
其中电极内端子213和与电芯电连接的内引出件焊接，在一些实施例中内引出件上可以形成焊孔，电极内端子213形成为柱状结构并嵌入该焊孔中以与内引出件焊接。其中为了避免盖板带电，盖板和内引出件之间设置有盖板绝缘件，电机内端子可以有间隙地穿过该盖板绝缘件以与刻痕件焊接，另外为了保证密封性，还包括支撑环，支撑环的下端焊接在盖板上，其中可以选用陶瓷作为材料，以保证电流中断装置和盖板的绝缘，盖板上则形成有孔道，以便于电流中断装置的安装。另外为了保证电池内部的气体能够作用到翻转件222上，内引出件上形成有气孔，从而使得气体能够通过该气孔作用到翻转件222上。
一种电池系统，包括至少一条串联回路，所述串联回路中设置有软包电池和至少一个与所述软包电池串联连接的第一单体电池，在所述第一单体电池上设置有电流中断装置；所述第一单体电池的电流中断装置用于，在所述软包电池、第一单体电池中的至少一个出现异常时断开该第一单体电池的内部电流。
在一些实施例中，所述串联回路中包括多个与所述软包电池串联连接的第一单体电池，所述多个第一单体电池之间依次串联或间隔串联连接。
在一些实施例中，所述串联回路中包括多个与所述软包电池串联连接的第一单体电池，多个所述第一单体电池并联组成一电池组与所述软包电池串联。
在一些实施例中，所述第一单体电池包括外壳、容纳在所述外壳内的电芯、封装所述外壳的盖板、位于所述盖板内侧的电极内端子以及位于所述盖板外侧的电极外端子，所述电极内端子与所述电芯电连接，所述电流中断装置设置在所述盖板上且分别与所述电极外端子和所述电极内端子电连接。
在一些实施例中，所述外壳为铝壳、钢壳、塑料壳中的一种，所述外壳的厚度为0.4mm-1.5mm。
在一些实施例中，所述电流中断装置包括刻痕件和翻转件，所述刻痕件电连接在所述电极内端子上，所述翻转件分别与所述刻痕件和所述电极外端子电连接且与所述第一单体电池的内部气体连通。
在一些实施例中，所述刻痕件包括形成有刻痕的刻痕区、用于与翻转件相互电连接的第一焊接区以及用于与所述电极内端子电连接的第二焊接区，所述翻转件能够在气压作用下动作以拉断所述刻痕，所述翻转件拉断刻痕后可以与电极内端子断开电连接，所述刻痕围绕所述第一焊接区设置，并且所述第一焊接区、第二焊接区中的至少一个与所述刻痕异面设置。
在一些实施例中，所述刻痕与第一焊接区和第二焊接区异面设置。
在一些实施例中，所述刻痕件上形成有从该刻痕区凸出的凸台，所述第一焊接区由所述凸台上表面形成并且与所述刻痕区平行，并且该上表面的外周缘设置有环形焊点。
在一些实施例中，所述刻痕区的外周缘形成有与所述凸台同向凸出的环壁，所述环壁的上边缘与所述凸台的上边缘在高度方向上对齐，并且该环壁的外壁用于与所述电极内端子电连接。
在一些实施例中，所述第二焊接区、所述刻痕区、所述第一焊接区沿径向从外向内依次布置，并且从外向内形成为逐渐接近所述翻转件的台阶结构，所述刻痕围绕所述第一焊接区设置。
在一些实施例中，所述刻痕区的外周缘形成有与所述凸台反向凸出的环壁，所述第二焊接区形成在所述环壁的外周缘并与所述刻痕区平行，所述第二焊接区的外周缘形成有环形焊点。
在一些实施例中，所述凸台的侧壁与所述环壁分别与所述刻痕区垂直。
在一些实施例中，所述第一焊接区、所述刻痕区和所述第二焊接区分别形成为环状结构。
在一些实施例中，所述翻转件上形成有用于与所述刻痕件电连接的第一连接区和用于与所述电极外端子电连接的第二连接区，所述翻转件上还形成有变形缓冲区，所述变形缓冲区设置在所述第一连接区。
在一些实施例中，所述翻转件为形成锥形的片状结构，该锥形的小端形成为所述第一连接区，大端远离所述刻痕件形成为所述第二连接区。
在一些实施例中，所述变形缓冲区形成为围绕所述第一连接区的环形槽结构。
在一些实施例中，所述环形槽结构的径向截面为弧形或角型。
在一些实施例中，所述翻转件的外周缘下侧与所述盖板之间密封连接有支撑环，所述电极外端子的外周缘电连接在所述翻转件的外周缘上侧。
在一些实施例中，所述支撑环的内壁形成有支撑凸缘，所述翻转件和所述电极外端子的外周缘支撑在所述支撑凸缘的上表面。
相应地，本公开还提供一种电动汽车，该电动汽车包括如上所述的电池系统。
以上结合附图详细描述了本公开的一些实施方式，但是，本公开并不限于上述实施方式中的具体细节，在本公开的技术构思范围内，可以对本公开的技术方案进行多种简单变型，这些简单变型均属于本公开的保护范围。
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合。为了避免不必要的重复，本公开对各种可能的组合方式不再另行说明。
此外，本公开的各种不同的实施方式之间也可以进行任意组合，只要其不违背本公开的思想，其同样应当视为本公开所公开的内容。

Claims (21)

  1. 一种电池系统，其特征在于，包括至少一条串联回路，所述串联回路中设置有软包电池和至少一个与所述软包电池串联连接的第一单体电池，在所述第一单体电池上设置有电流中断装置；
    所述第一单体电池的电流中断装置用于，在所述软包电池、第一单体电池中的至少一个出现异常时断开该第一单体电池的内部电流。
  2. 根据权利要求1所述的电池系统，其特征在于，所述串联回路中包括多个与所述软包电池串联连接的第一单体电池，所述多个第一单体电池之间依次串联或间隔串联连接。
  3. 根据权利要求1所述的电池系统，其特征在于，所述串联回路中包括多个与所述软包电池串联连接的第一单体电池，多个所述第一单体电池并联组成一电池组与所述软包电池串联。
  4. 根据权利要求1-3中任一项所述的电池系统，其特征在于，所述第一单体电池包括外壳、容纳在所述外壳内的电芯、封装所述外壳的盖板、位于所述盖板内侧的电极内端子以及位于所述盖板外侧的电极外端子，所述电极内端子与所述电芯电连接，所述电流中断装置设置在所述盖板上且分别与所述电极外端子和所述电极内端子电连接。
  5. 根据权利要求4所述的电池系统，其特征在于，所述外壳为铝壳、钢壳、塑料壳中的一种，所述外壳的厚度为0.4mm-1.5mm。
  6. 根据权利要求5所述的电池系统，其特征在于，所述电流中断装置包括刻痕件和翻转件，所述刻痕件电连接在所述电极内端子上，所述翻转件分别与所述刻痕件和所述电极外端子电连接且与所述第一单体电池的内部气体连通。
  7. 根据权利要求6所述的电池系统，其特征在于，所述刻痕件包括形成有刻痕的刻痕区、用于与翻转件相互电连接的第一焊接区以及用于与所述电极内端子电连接的第二焊接区，所述翻转件能够在气压作用下动作以拉断所述刻痕，所述刻痕围绕所述第一焊接区设置，并且所述第一焊接区、第二焊接区中的至少一个与所述刻痕异面设置。
  8. 根据权利要求7所述的电池系统，其特征在于，所述刻痕与第一焊接区和第二焊接区异面设置。
  9. 根据权利要求8所述的电池系统，其特征在于，所述刻痕件上形成有从该刻痕区凸出的凸台，所述第一焊接区由所述凸台上表面形成并且与所述刻痕区平行，并且该上表面的外周缘设置有环形焊点。
  10. 根据权利要求9所述的电池系统，其特征在于，所述刻痕区的外周缘形成有与所述凸台同向凸出的环壁，所述环壁的上边缘与所述凸台的上边缘在高度方向上对齐，并且 该环壁的外壁用于与所述电极内端子电连接。
  11. 根据权利要求9或10所述的电池系统，其特征在于，所述第二焊接区、所述刻痕区、所述第一焊接区沿径向从外向内依次布置，并且从外向内形成为逐渐接近所述翻转件的台阶结构，所述刻痕围绕所述第一焊接区设置。
  12. 根据权利要求11所述的电池系统，其特征在于，所述刻痕区的外周缘形成有与所述凸台反向凸出的环壁，所述第二焊接区形成在所述环壁的外周缘并与所述刻痕区平行，所述第二焊接区的外周缘形成有环形焊点。
  13. 根据权利要求12所述的电池系统，其特征在于，所述凸台的侧壁与所述环壁分别与所述刻痕区垂直。
  14. 根据权利要求7-13任意一项所述的电池系统，其特征在于，所述第一焊接区、所述刻痕区和所述第二焊接区分别形成为环状结构。
  15. 根据权利要求6-14中任一项所述的电池系统，其特征在于，所述翻转件上形成有用于与所述刻痕件电连接的第一连接区和用于与所述电极外端子电连接的第二连接区，所述翻转件上还形成有变形缓冲区，所述变形缓冲区设置在所述第一连接区。
  16. 根据权利要求15所述的电池系统，其特征在于，所述翻转件为形成锥形的片状结构，该锥形的小端形成为所述第一连接区，大端远离所述刻痕件形成为所述第二连接区。
  17. 根据权利要求15或16所述的电池系统，其特征在于，所述变形缓冲区形成为围绕所述第一连接区的环形槽结构。
  18. 根据权利要求17所述的电池系统，其特征在于，所述环形槽结构的径向截面为弧形或角型。
  19. 根据权利要求6-18中任一项所述的电池系统，其特征在于，所述翻转件的外周缘下侧与所述盖板之间密封连接有支撑环，所述电极外端子的外周缘电连接在所述翻转件的外周缘上侧。
  20. 根据权利要求19所述的电池系统，其特征在于，所述支撑环的内壁形成有支撑凸缘，所述翻转件和所述电极外端子的外周缘支撑在所述支撑凸缘的上表面。
  21. 一种电动汽车，其特征在于，包括权利要求1-20中任一项所述的电池系统。
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