WO2022104610A1 - 电池盖板及锂离子二次电池 - Google Patents

电池盖板及锂离子二次电池 Download PDF

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Publication number
WO2022104610A1
WO2022104610A1 PCT/CN2020/129889 CN2020129889W WO2022104610A1 WO 2022104610 A1 WO2022104610 A1 WO 2022104610A1 CN 2020129889 W CN2020129889 W CN 2020129889W WO 2022104610 A1 WO2022104610 A1 WO 2022104610A1
Authority
WO
WIPO (PCT)
Prior art keywords
explosion
electrode terminal
cover plate
battery
battery cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/129889
Other languages
English (en)
French (fr)
Inventor
邓国友
靳勇
慎晓杰
臧庆凤
张俊丽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Microvast Power Systems Huzhou Co Ltd
Microvast Holdings Inc
Original Assignee
Microvast Power Systems Huzhou Co Ltd
Microvast Inc
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 Microvast Power Systems Huzhou Co Ltd, Microvast Inc filed Critical Microvast Power Systems Huzhou Co Ltd
Priority to PCT/CN2020/129889 priority Critical patent/WO2022104610A1/zh
Priority to US18/036,411 priority patent/US20230402688A1/en
Priority to CN202090001219.2U priority patent/CN220753581U/zh
Priority to EP20961901.4A priority patent/EP4250443A4/en
Publication of WO2022104610A1 publication Critical patent/WO2022104610A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H01M50/143—Fireproof; Explosion-proof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M50/543—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
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular, to a battery cover plate and a lithium ion secondary battery.
  • Lithium-ion batteries are widely used due to their high energy density and long service life.
  • the chemical reaction inside the battery will intensify, a large amount of gas will be generated, the internal pressure of the battery will rise sharply, and there is a risk of thermal runaway of the battery system, which may even cause the battery to explode.
  • the casing of the current square lithium-ion battery mainly includes a casing and a battery cover.
  • one of the methods is to set an explosion-proof valve on the battery cover.
  • the burst valve bursts to release the pressure, thereby avoiding the risk of battery explosion.
  • the method of arranging the explosion-proof valve on the battery cover has the problems of complicated process and high cost.
  • Another method is to set a notch on the battery case, that is, mechanically press grooves on the surface of the case.
  • a notch on the battery case that is, mechanically press grooves on the surface of the case.
  • the above two methods can achieve the purpose of pressure relief after the internal pressure of the battery increases to a certain extent, but after the pressure is released, the battery and the external electrical components are still in a normal electrical connection state, and cannot effectively prevent the continuous production inside the battery. hot.
  • the purpose of the present application is to provide a battery cover plate and a lithium ion secondary battery, aiming at solving the above-mentioned deficiencies in the background technology, which can not only realize the explosion-proof function of the battery, but also weaken or block the contact between the electrode terminal and the battery cell. Electrical connection, thus effectively inhibiting the continued heat generation inside the battery.
  • An embodiment of the present application provides a battery cover plate, the battery cover plate is provided with electrode terminals, and the battery cover plate is also provided with an explosion-proof score, the explosion-proof score surrounds or partially surrounds the electrode Terminal settings.
  • the number of the electrode terminals is two, which are a first electrode terminal and a second electrode terminal respectively, and the first electrode terminal and the second electrode terminal are both provided on the battery on the cover.
  • the explosion-proof score is arranged around or partially around one of the electrode terminals, or the explosion-proof score is arranged around or partly around the first electrode terminal and the second electrode terminal at the same time.
  • the number of the explosion-proof score is two, which are a first explosion-proof score and a second explosion-proof score respectively, and/or the first explosion-proof score surrounds or partially surrounds the The first electrode terminal is arranged, and the second explosion-proof score is arranged around or partially around the second electrode terminal.
  • the explosion-proof score is a closed annular structure, or a U-shaped or C-shaped structure with an opening.
  • the notch depth of the explosion-proof notch is 5%-95% of the thickness of the battery cover plate, or the notch depth of the explosion-proof notch is 5% to 95% of the thickness of the battery cover plate. 30%-90%, or the notch depth of the explosion-proof notch is 50%-85% of the thickness of the battery cover plate.
  • a lithium ion secondary battery including a case and a battery cover, wherein the case is encapsulated with a battery cell, an end of the case has an opening, and the battery cover is sealed At the opening, electrode terminals are arranged on the battery cover plate, and explosion-proof nicks are also arranged on the battery cover plate, and the explosion-proof notch is arranged around or partially around the electrode terminals.
  • the number of the electrode terminals is two, which are a first electrode terminal and a second electrode terminal respectively, and the first electrode terminal and the second electrode terminal are both provided on the battery on the cover.
  • the explosion-proof score is arranged around or partially around one of the electrode terminals, or the explosion-proof score is arranged around or partly around the first electrode terminal and the second electrode terminal at the same time.
  • the number of the explosion-proof score is two, which are a first explosion-proof score and a second explosion-proof score, and the first explosion-proof score surrounds or partially surrounds the first electrode
  • the terminals are arranged, and/or the second explosion proof score is arranged around or partially around the second electrode terminals.
  • the explosion-proof score is a closed annular structure, or a U-shaped or C-shaped structure with an opening.
  • a tab is provided in the housing, the electrode terminal is electrically connected to the battery cell through the tab, and one end of the tab is connected to the cell, and the The other end of the tab is connected to the electrode terminal, and the tab is provided with at least one fracture.
  • both opposite ends of the casing have the openings, and the number of the battery cover plates is two, which are a first battery cover plate and a second battery cover plate, respectively.
  • the first battery cover plate is sealed at the opening of one end of the casing
  • the second battery cover is sealed at the opening of the other end of the casing
  • the first battery cover is sealed at the opening of the other end of the casing.
  • the battery cover plate and/or the second battery cover plate is provided with the explosion-proof notch.
  • an explosion-proof notch is provided on the battery cover, so that the battery cover can be ruptured or burst open from the explosion-proof notch when the battery is abnormal, and the battery can quickly release the pressure, thereby realizing the battery Explosion proof function.
  • the explosion-proof notch is arranged around or partially around the periphery of the electrode terminal, so that when the battery cover plate is broken or burst open, the electrode terminal can move together, and the electrode terminal is separated from the original position and moves away from the cell.
  • the movement of the battery will pull the tab, so that the tab or the connection between the tab (including the connection between the tab and the electrode terminal, or the connection between the tab and the pole piece of the cell) can be partially or completely broken, thereby weakening or blocking the electrode terminal.
  • the electrical connection with the battery cell means weakening or blocking the electrical connection between the external electrical components and the battery cell, thereby effectively inhibiting the continued heat generation inside the battery and improving the safety performance of the battery.
  • FIG. 1 is a schematic structural diagram of a battery cover plate in an embodiment of the present application.
  • FIG. 2 is a schematic cross-sectional view at the position A-A in FIG. 1 .
  • FIG. 3 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a lithium ion secondary battery according to an embodiment of the present application.
  • FIG. 5 is a schematic exploded view of the lithium ion secondary battery in FIG. 4 .
  • FIG. 6 is a schematic diagram of a part of the internal structure of the lithium ion secondary battery in FIG. 4 .
  • FIG. 7 is a schematic exploded view of a lithium ion secondary battery in another embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a battery cover plate in another embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a lithium ion secondary battery in another embodiment of the present application.
  • an embodiment of the present application provides a battery cover plate 2 , which is especially suitable for a square lithium-ion battery.
  • the battery cover plate 2 is arranged on the casing 3, the casing 3 is encapsulated with a battery cell 4, the battery cover plate 2 is provided with an electrode terminal 5, and the electrode terminal 5 is electrically connected to the battery core 4 through the electrode lug 6, and the electrode lug 6 One end of the electrode is connected to the cell 4, and the other end of the tab 6 is connected to the electrode terminal 5 (wherein, the structures of the housing 3, the cell 4 and the tab 6 can be seen in Figures 4 to 6).
  • the battery cover plate 2 is also provided with an explosion-proof score 7.
  • the explosion-proof score 7 is a groove formed by mechanically pressing on the surface of the battery cover plate 2.
  • the explosion-proof score 7 is arranged around the electrode terminal 5, that is, the explosion-proof score 7 is formed.
  • the entire electrode terminal 5 is surrounded.
  • an electrode terminal 5 is provided on the battery cover plate 2, the electrode terminal 5 is fixed on the battery cover plate 2, and the electrode terminal 5 is used for the battery cell 4 and external electrical components (not shown in the figure) electrical connection.
  • the battery cover plate 2 is used to seal the casing 3 , so that the battery cells 4 are encapsulated in the casing 3 .
  • the battery cover plate 2 is further provided with a liquid injection hole 9 , and the liquid injection hole 9 is used for injecting the electrolyte into the casing 3 .
  • the explosion-proof notches 7 are provided on the outer surface of the battery cover plate 2 .
  • the explosion-proof notch 7 can also be provided on the inner surface of the battery cover plate 2 , or on the outer surface of the battery cover plate 2 and the inner surface of the battery cover plate 2 at the same time, which is not limited here.
  • the explosion-proof score 7 is a rectangular structure, that is, a closed annular structure.
  • the closed annular structure may also be a circle, a triangle or the like, which is not limited herein.
  • the explosion-proof notch 7 is a U-shaped structure with an opening, and the explosion-proof notch 7 partially surrounds the electrode terminal 5 It is provided that the explosion-proof notches 7 do not completely surround the electrode terminals 5 .
  • the explosion-proof notch 7 may also be C-shaped, L-shaped, etc., which is not limited herein.
  • the explosion-proof notch 7 is provided on the battery cover plate 2, so that the battery cover plate 2 can be ruptured or burst open from the explosion-proof notch 7 when the battery is abnormal, and the battery can be quickly depressurized, so as to realize the safety of the battery. Explosion proof function.
  • the explosion-proof notch 7 is arranged around or partially around the electrode terminal 5, so that the battery cover 2 can drive the electrode terminal 5 to move together when the battery cover 2 is ruptured or burst open, and the electrode terminal 5 leaves the original position and moves away from the battery core 4.
  • the movement of the electrode terminal 5 will pull the tab 6, so that the tab 6 or the connection of the tab 6 (including the connection between the tab 6 and the electrode terminal 5, or the connection between the tab 6 and the pole piece of the cell 4) can be partially broken or completely broken, thereby weakening (the resistance will increase after the tab 6 is partially broken) or blocking the electrical connection between the electrode terminal 5 and the cell 4, that is, weakening or blocking the electrical connection between the external electrical components and the cell 4, thereby
  • the internal heat generation of the battery is effectively suppressed, and the safety performance of the battery is improved.
  • the notch depth of the explosion-proof notch 7 is 50%-85% of the thickness of the battery cover plate 2 .
  • the depth of the explosion-proof notch 7 can also be designed according to actual needs.
  • the overall shape of the explosion-proof notch 7 can be designed according to the shape of the electrode terminal 5 or the shape of the battery cover plate 2 .
  • the shape, size, depth and width of the explosion-proof score 7 can be designed according to the critical burst pressure of the battery. For example, when the critical burst pressure of the battery is small, that is, in order to ensure the safety performance of the battery, the battery cover plate 2 needs to be blasted when the internal pressure of the battery is small. Since the internal pressure of the battery is small, the battery cover plate 2 is not easy to cracked or burst open.
  • the explosion-proof notch 7 can be designed to be closer to the annular structure, so that the battery cover 2 can be more easily broken or exploded along the explosion-proof notch 7 (for example, when the explosion-proof notch 7 is designed as an L-shaped structure, the Under the critical burst pressure of the battery, the battery cover plate 2 will not rupture or burst open; when the explosion-proof notch 7 is designed into a U-shaped structure, the battery cover plate 2 can be ruptured or burst open, that is, to meet the actual needs);
  • the explosion-proof notch 7 is designed to be larger. Under the same pressure, the larger the force area of the battery cover 2 at the location of the explosion-proof notch 7, the greater the pressure, that is, the battery cover 2 is easier to move along.
  • the explosion-proof notch 7 is broken or burst open; or the depth of the explosion-proof notch 7 can be designed to be deeper or the width of the explosion-proof notch 7 can be designed to be wider, and the strength of the battery cover 2 at the explosion-proof notch 7 is lower. , so that the battery cover plate 2 is easier to crack or burst along the explosion-proof notch 7 . vice versa.
  • the shape, size and depth of the explosion-proof score 7 are not limited here.
  • the lithium ion secondary battery 1 As shown in FIGS. 4 to 6 , another embodiment of the present application provides a lithium ion secondary battery 1 , especially a square lithium ion secondary battery, the lithium ion secondary battery 1 includes a case 3 and a battery The cover plate 2 and the casing 3 encapsulate the battery core 4 .
  • the two opposite ends of the casing 3 have openings 31, and the number of battery cover plates 2 is two, which are the first battery cover plate 21 and the second battery cover plate 22, respectively.
  • the plate 21 is sealed at the opening 31 at one end of the casing 3
  • the second battery cover plate 22 is sealed at the opening 31 at the other end of the casing 3 .
  • the battery cover plate 2 is provided with electrode terminals 5, and the number of electrode terminals 5 is two, which are the first electrode terminal 51 and the second electrode terminal 52 respectively, and the first electrode terminal 51 is provided on the first battery
  • the second electrode terminal 52 is disposed on the second battery cover plate 22 , the first electrode terminal 51 is connected to one end of the cell 4 , and the second electrode terminal 52 is connected to the other end of the cell 4 .
  • the battery cell 4 is divided into a positive electrode and a negative electrode.
  • the positive electrode and the negative electrode of the battery cell 4 are located at opposite ends of the battery cell 4 respectively, and one of the first electrode terminal 51 and the second electrode terminal 52 One is electrically connected to the positive electrode of the battery cell 4 , and the other is electrically connected to the negative electrode of the battery cell 4 .
  • both the first battery cover 21 and the second battery cover 22 are provided with explosion-proof notches 7, and the number of explosion-proof notches 7 is two, which are the first explosion-proof notches 71 and the second explosion-proof notches 7 respectively.
  • the first explosion-proof notch 71 is arranged around the first electrode terminal 51
  • the second explosion-proof notch 72 is arranged around the second electrode terminal 52 .
  • the first explosion-proof notch 71 may also be arranged around or partially around the first electrode terminal 51
  • the second explosion-proof notch 72 may be arranged around or partly around the second electrode terminal 52 , which is not limited herein.
  • the explosion-proof score 7 is a rectangular structure, that is, a closed annular structure.
  • the closed annular structure may also be a circle, a triangle, or the like.
  • the explosion-proof notch 7 may also be a U-shaped, C-shaped, or L-shaped structure with an opening, which is not limited herein.
  • the shell 3 is provided with a tab 6, the electrode terminal 5 is electrically connected to the cell 4 through the tab 6, one end of the tab 6 is connected to the cell 4, and the other end of the tab 6 is connected to the electrode terminal 5 connections.
  • the number of tabs 6 is two, one tab 6 is connected between the first electrode terminal 51 and the cell 4 , and the other tab 6 is connected between the second electrode terminal 52 and the cell 4 .
  • At least one fracture opening 8 is provided on the ear 6 .
  • each tab 6 is provided with two breaking openings 8 , and the two breaking openings 8 are symmetrically arranged on two opposite sides of each tab 6 .
  • each tab 6 may also be provided with more breaking openings 8 , such as three, four, etc., which are not limited herein.
  • the fracture opening 8 is small, the influence on the electrical conductivity of the tab 6 is very small.
  • the tabs 6 are easily pulled and disconnected, thereby prompting the battery to form an open circuit, more effectively suppressing the continued heat generation inside the battery, and further improving the safety performance of the battery.
  • the first battery cover plate 21 and/or the second battery cover plate 22 is provided with the liquid injection hole 9 .
  • FIG. 7 another embodiment of the present application provides a lithium ion secondary battery 1 , which is different from the above-mentioned embodiment in that only one of the first battery cover plate 21 or the second battery cover plate 22 is provided.
  • the explosion-proof notches 7 are provided, and at the same time, only the tabs 6 connected to the electrode terminals 5 provided with the explosion-proof notches 7 are provided with fracture openings 8 .
  • the explosion-proof score 7 is provided around the first electrode terminal 51
  • the tab 6 connected to the first electrode terminal 51 is provided with a fracture opening 8 .
  • the explosion-proof notch 7 may also be provided on one of the battery cover plates 2, and the explosion-proof notch 7 is partially arranged around one of the electrode terminals 5, which is not limited herein.
  • FIG. 8 another embodiment of the present application provides a battery cover plate 2 .
  • the battery cover plate 2 is provided with electrode terminals 5 , and the number of electrode terminals 5 is two, which are a first electrode terminal 51 and a second electrode terminal 5 .
  • Two electrode terminals 52 , the first electrode terminal 51 and the second electrode terminal 52 are all disposed on the battery cover plate 2 .
  • the battery cover plate 2 is further provided with an explosion-proof notch 7 , and the number of explosion-proof notch 7 is one, and the explosion-proof notch 7 is arranged around the first electrode terminal 51 and the second electrode terminal 52 at the same time.
  • the battery cover plate 2 is also provided with a liquid injection hole 9 .
  • the explosion-proof score 7 is a rectangular structure, that is, a closed annular structure.
  • the closed annular structure may also be a circle, a triangle, or the like.
  • the explosion-proof notch 7 may also be a U-shaped, C-shaped, or L-shaped structure with an opening, which is not limited herein.
  • FIG. 9 another embodiment of the present application provides a battery cover plate 2 , which is different from the above-mentioned embodiment in that the number of explosion-proof notches 7 is one, and the explosion-proof notches 7 partially surround the first electrode terminal 51 at the same time. and the second electrode terminal 52 are provided.
  • another embodiment of the present application provides a battery cover plate 2 , which is different from the above embodiment in that the number of explosion-proof notches 7 is one, and the explosion-proof notches 7 are arranged around one of the electrode terminals 5 . Specifically, the explosion-proof score 7 is provided around the first electrode terminal 51 .
  • FIG. 11 another embodiment of the present application provides a battery cover plate 2 .
  • the number of explosion-proof notches 7 is one, and the explosion-proof notches 7 partially surround one of the electrode terminals 5 set up. Specifically, the explosion-proof score 7 is partially provided around the first electrode terminal 51 .
  • another embodiment of the present application provides a battery cover plate 2 , which is different from the above-mentioned embodiment in that the number of explosion-proof notches 7 is two, which are the first explosion-proof notches 71 and the first explosion-proof notches 71 , respectively.
  • Two explosion-proof notches 72 , the first explosion-proof notches 71 are arranged around the first electrode terminal 51
  • the second explosion-proof notches 72 are arranged around the second electrode terminal 52 .
  • another embodiment of the present application provides a battery cover plate 2 , which is different from the above-mentioned embodiment in that the number of explosion-proof notches 7 is two, which are the first explosion-proof notches 71 and the first explosion-proof notches 71 , respectively.
  • Two explosion-proof notches 72 , the first explosion-proof notches 71 are partially arranged around the first electrode terminals 51 , and the second explosion-proof notches 72 are partly arranged around the second electrode terminals 52 .
  • the first explosion-proof score 71 may also be arranged around the first electrode terminal 51, and the second explosion-proof score 72 may be partially arranged around the second electrode terminal 52; or the first explosion-proof score 71 may be partly surrounded by The first electrode terminal 51 is provided, and the second explosion-proof notch 72 is provided around the second electrode terminal 52 , which is not limited herein.
  • a lithium ion secondary battery 1 especially a square lithium ion battery
  • the lithium ion secondary battery 1 includes a casing 3 and a battery cover 2, the casing
  • the battery 4 is encapsulated in the body 3 .
  • one end of the casing 3 has an opening 31 , and the battery cover 2 is sealed at the opening 31 .
  • the battery cover plate 2 is provided with electrode terminals 5, and the number of electrode terminals 5 is two, which are the first electrode terminal 51 and the second electrode terminal 52, and the first electrode terminal 51 and the second electrode terminal respectively. 52 are all arranged on the battery cover plate 2 .
  • the positive electrode and the negative electrode of the battery cell 4 are located at the same end of the battery cell 4 , one of the first electrode terminal 51 and the second electrode terminal 52 is electrically connected to the positive electrode of the battery cell 4 , and the other is electrically connected to the negative electrode of the battery cell 4 . connect.
  • the number of explosion-proof notches 7 is one, and the explosion-proof notches 7 are arranged around the first electrode terminal 51 and the second electrode terminal 52 at the same time.
  • the explosion-proof notch 7 may also be partially disposed around the first electrode terminal 51 and the second electrode terminal 52 at the same time.
  • the number of explosion-proof notches 7 is two (refer to FIG. 12 and FIG. 13 ), which are the first explosion-proof notches 71 and the second explosion-proof notches 72 respectively, and the first explosion-proof notches 71 surround or partially surround the first electrode
  • the terminal 51 is arranged, and the second explosion-proof notch 72 is arranged around or partially around the second electrode terminal 52 , which is not limited herein.
  • the explosion-proof score 7 is a rectangular structure, that is, a closed annular structure.
  • the closed annular structure may also be a circle, a triangle, or the like.
  • the explosion-proof notch 7 may also be a U-shaped, C-shaped, or L-shaped structure with an opening, which is not limited herein.
  • the shell 3 is provided with a tab 6, the electrode terminal 5 is electrically connected to the cell 4 through the tab 6, one end of the tab 6 is connected to the cell 4, and the other end of the tab 6 is connected to the electrode terminal 5 connections.
  • the number of tabs 6 is two, one tab 6 is connected between the first electrode terminal 51 and the cell 4 , and the other tab 6 is connected between the second electrode terminal 52 and the cell 4 .
  • At least one fracture opening 8 is provided on the ear 6 .
  • the battery cover plate 2 is also provided with a liquid injection hole 9 .
  • the advantages of the battery cover plate 2 and the lithium ion secondary battery 1 provided by the embodiments of the present application are:
  • the design of the explosion-proof notch 7 is adopted in the embodiment of the present application. Compared with the way of setting the explosion-proof valve on the battery cover plate 2, its structure and process are simpler and the cost is lower;
  • the embodiment of the present application adopts the design that the explosion-proof notch 7 surrounds or partially surrounds the electrode terminal 5, which simplifies the design of the explosion-proof structure of the battery, and the space layout is more concise.
  • the battery cover 2 when the battery cover 2 is broken or burst open, it can drive the electrode terminals 5 to move together, the electrode terminals 5 are separated from their original positions and move away from the battery core 4, and the movement of the electrode terminals 5 will pull the electrode lugs 6, so that the The ear 6 can be partially or completely broken, thereby weakening or blocking the electrical connection between the electrode terminal 5 and the battery cell 4, that is, weakening or blocking the electrical connection between the external electrical components and the battery cell 4, thereby effectively inhibiting the secondary lithium ion
  • the interior of the battery 1 continues to generate heat, which can improve the explosion-proof effect of the lithium-ion secondary battery 1;
  • a fracture opening 8 is provided on the tab 6 connected to the electrode terminal 5 provided with the explosion-proof notch 7, so that after the battery cover 2 is ruptured or burst open, the electrode terminal 5 is pulling the tab 6. At this time, the electrode terminals 5 are more likely to pull and disconnect the tabs 6, thereby prompting the battery to form an open circuit, effectively suppressing the continued heat generation inside the battery, and further improving the safety performance of the battery.
  • an explosion-proof notch is provided on the battery cover, so that the battery cover can be ruptured or burst open from the explosion-proof notch when the battery is abnormal, and the battery can quickly release the pressure, thereby realizing the battery Explosion proof function.
  • the explosion-proof notch is arranged around or partially around the periphery of the electrode terminal, so that when the battery cover plate is broken or burst open, the electrode terminal can move together, and the electrode terminal is separated from the original position and moves away from the cell.
  • the movement of the battery will pull the tab, so that the tab or the connection between the tab (including the connection between the tab and the electrode terminal, or the connection between the tab and the pole piece of the cell) can be partially or completely broken, thereby weakening or blocking the electrode terminal.
  • the electrical connection with the battery cell means weakening or blocking the electrical connection between the external electrical components and the battery cell, thereby effectively inhibiting the continued heat generation inside the battery and improving the safety performance of the battery.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种电池盖板（2）以及锂离子二次电池（1），所述电池盖板（2）上设置有电极端子（5），所述电池盖板（2）上还设有防爆刻痕（7），所述防爆刻痕（7）环绕或部分围绕所述电极端子（5）设置。通过在电池盖板（2）上设置防爆刻痕（7），使得电池盖板（2）在电池异常的情况下能够从防爆刻痕（7）处破裂或爆开，电池能够快速泄压，从而实现电池的防爆功能。同时，防爆刻痕（7）环绕或部分围绕设置在电极端子（5）的外围，使得电池盖板（2）在破裂或爆开时能够带动电极端子（5）一起运动，电极端子（5）的运动会拉扯极耳（6），使得极耳（6）或者极耳（6）连接处能够部分断裂或完全断裂，从而减弱或阻断电极端子（5）与电芯（4）的电连接，有效地抑制电池内部继续产热。

Description

电池盖板及锂离子二次电池 技术领域
本申请涉及电池技术领域，尤其是涉及一种电池盖板及锂离子二次电池。
 背景技术
随着电动汽车的应用和大面积推广，电池作为电动汽车的核心零部件，对于电池的安全性能提出了更高的要求。
锂离子电池由于能量密度高、使用寿命长而得到广泛应用。但当电池系统内部的电芯出现异常产生大量热量时，电池内部的化学反应加剧，会产生大量的气体，电池的内压急剧升高，存在电池系统热失控的风险，甚至可能导致电池爆炸。
 技术问题
目前的方形锂离子电池的外壳主要包括壳体和电池盖板，为了防止电池爆炸，其中一种方法是在电池盖板上设置防爆阀。当电池内部的压力增大到爆破压力的情况下，爆破阀爆裂泄压，从而避免电池爆炸的风险。但在电池盖板上设置防爆阀的方法存在工艺复杂且成本较高的问题。
另一种方法是在电池壳体上设置刻痕，即用机械方法在外壳的表面压制凹槽，当电池内部压力增大时，引导电池的壳体从刻痕处破裂，从而达到防爆的目的。
以上两种方法在电池内部压力增大到一定程度后都能够实现泄压的目的，但泄压后电池与外部的电器元件仍处于正常的电连接状态，并未能有效地阻止电池内部持续产热。
 技术解决方案
本申请的目的是提供一种电池盖板及锂离子二次电池，旨在解决上述背景技术存在的不足，既能够实现电池的防爆功能，又能够减弱或阻断电极端子与电芯之间的电连接，从而有效地抑制电池内部继续产热。
本申请的一种实施例提供一种电池盖板，所述电池盖板上设置有电极端子，所述电池盖板上还设有防爆刻痕，所述防爆刻痕环绕或部分围绕所述电极端子设置。
在一种可实现的方式中，所述电极端子的数量为两个，分别为第一电极端子和第二电极端子，所述第一电极端子和所述第二电极端子均设置在所述电池盖板上。
在一种可实现的方式中，所述防爆刻痕环绕或部分围绕其中一个电极端子设置，或者所述防爆刻痕同时环绕或部分围绕所述第一电极端子和所述第二电极端子设置。
在一种可实现的方式中，所述防爆刻痕的数量为两个，分别为第一防爆刻痕和第二防爆刻痕，和/或所述第一防爆刻痕环绕或部分围绕所述第一电极端子设置，所述第二防爆刻痕环绕或部分围绕所述第二电极端子设置。
在一种可实现的方式中，所述防爆刻痕为封闭的环形结构，或具有开口的U形或C形结构。
在一种可实现的方式中，所述防爆刻痕的刻痕深度为所述电池盖板厚度的5%-95%，或者所述防爆刻痕的刻痕深度为所述电池盖板厚度的30%-90%，或者所述防爆刻痕的刻痕深度为所述电池盖板厚度的50%-85%。
本申请的另一实施例还提供一种锂离子二次电池，包括壳体和电池盖板，所述壳体内封装有电芯，所述壳体的端部具有开口，所述电池盖板密封设置在所述开口处，所述电池盖板上设置有电极端子，所述电池盖板上还设有防爆刻痕，所述防爆刻痕环绕或部分围绕所述电极端子设置。
在一种可实现的方式中，所述电极端子的数量为两个，分别为第一电极端子和第二电极端子，所述第一电极端子和所述第二电极端子均设置在所述电池盖板上。
在一种可实现的方式中，所述防爆刻痕环绕或部分围绕其中一个电极端子设置，或者所述防爆刻痕同时环绕或部分围绕所述第一电极端子和所述第二电极端子设置。
在一种可实现的方式中，所述防爆刻痕的数量为两个，分别为第一防爆刻痕和第二防爆刻痕，所述第一防爆刻痕环绕或部分围绕所述第一电极端子设置，和/或所述第二防爆刻痕环绕或部分围绕所述第二电极端子设置。
在一种可实现的方式中，所述防爆刻痕为封闭的环形结构，或具有开口的U形或C形结构。
在一种可实现的方式中，所述壳体内设置有极耳，所述电极端子通过所述极耳与所述电芯电连接，所述极耳的一端与所述电芯连接，所述极耳的另一端与所述电极端子连接，所述极耳上设有至少一个断裂口。
在一种可实现的方式中，所述壳体的相对两个端部均具有所述开口，所述电池盖板的数量为两个，分别为第一电池盖板和第二电池盖板，所述第一电池盖板密封设置在所述壳体的其中一个端部的开口处，所述第二电池盖板密封设置在所述壳体的另一个端部的开口处，所述第一电池盖板和/或所述第二电池盖板上设有所述防爆刻痕。
 有益效果
本申请提供的电池盖板，通过在电池盖板上设置防爆刻痕，使得电池盖板在电池异常的情况下能够从防爆刻痕处破裂或爆开，电池能够快速泄压，从而实现电池的防爆功能。同时，防爆刻痕环绕或部分围绕设置在电极端子的外围，使得电池盖板在破裂或爆开时能够带动电极端子一起运动，电极端子脱离原来的位置并向远离电芯的方向移动，电极端子的运动会拉扯极耳，使得极耳或者极耳连接处（包括极耳与电极端子连接处，或者极耳与电芯的极片连接处）能够部分断裂或完全断裂，从而减弱或阻断电极端子与电芯的电连接，即减弱或阻断外部的电器元件与电芯的电连接，从而有效地抑制电池内部继续产热，提高了电池的安全性能。
 附图说明
图1为本申请一实施例中电池盖板的结构示意图。
图2为图1沿A-A位置处的截面示意图。
图3为本申请另一实施例中电池盖板的结构示意图。
图4为本申请一实施例中锂离子二次电池的结构示意图。
图5为图4中锂离子二次电池的分解示意图。
图6为图4中锂离子二次电池的部分内部结构示意图。
图7为本申请另一实施例中锂离子二次电池的分解示意图。
图8为本申请另一实施例中电池盖板的结构示意图。
图9为本申请另一实施例中电池盖板的结构示意图。
图10为本申请另一实施例中电池盖板的结构示意图。
图11为本申请另一实施例中电池盖板的结构示意图。
图12为本申请另一实施例中电池盖板的结构示意图。
图13为本申请另一实施例中电池盖板的结构示意图。
图14为本申请另一实施例中锂离子二次电池的结构示意图。
 本发明的实施方式
下面结合附图和实施例，对本申请的具体实施方式作进一步详细描述。以下实施例用于说明本申请，但不用来限制本申请的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”、“第三”、“第四”等（如果存在）是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。
如图1及图2所示，本申请的一种实施例提供一种电池盖板2，尤其适用于方形锂离子电池。该电池盖板2设置在壳体3上，壳体3内封装有电芯4，电池盖板2上设置有电极端子5，电极端子5通过极耳6与电芯4电连接，极耳6的一端与电芯4连接，极耳6的另一端与电极端子5连接（其中，壳体3、电芯4和极耳6的结构可参见图4至图6）。电池盖板2上还设有防爆刻痕7，防爆刻痕7为利用机械方法在电池盖板2的表面压制而成的凹槽，防爆刻痕7环绕电极端子5设置，即防爆刻痕7将整个电极端子5包围起来。
具体地，在上述实施例中，电池盖板2上设有一个电极端子5，电极端子5固定在电池盖板2上，电极端子5用于电芯4和外部的电器元件（图未示）的电连接。电池盖板2用于密封壳体3，使电芯4封装在壳体3内。
在上述实施例中，电池盖板2上还设有注液孔9，注液孔9用于向壳体3内注射电解液。
在上述实施例中，防爆刻痕7设置在电池盖板2的外表面。当然，在其它实施例中，防爆刻痕7也可以设置在电池盖板2的内表面，或者是同时设置在电池盖板2的外表面和电池盖板2的内表面，在此不作限定。
在上述实施例中，防爆刻痕7为矩形结构，即为封闭的环形结构。具体地，封闭的环形结构还可以为圆形、三角形等结构，在此不作限定。
如图3所示，本申请的另一实施例提供一种电池盖板2，与上述实施例不同的是，防爆刻痕7为具有开口的U形结构，防爆刻痕7部分围绕电极端子5设置，即防爆刻痕7不完全包围电极端子5。当然，在其它实施例中，防爆刻痕7还可以为C形、L形等结构，在此不作限定。
当电池系统内部的电芯4出现异常产生大量热量时，电池内部的化学反应加剧，会产生大量的气体，电池的内压急剧升高，存在电池系统热失控的风险，甚至可能导致电池爆炸。本申请实施例通过在电池盖板2上设置防爆刻痕7，使得电池盖板2在电池异常的情况下能够从防爆刻痕7处破裂或爆开，电池能够快速泄压，从而实现电池的防爆功能。同时，防爆刻痕7环绕或部分围绕电极端子5设置，使得电池盖板2在破裂或爆开时能够带动电极端子5一起运动，电极端子5脱离原来的位置并向远离电芯4的方向移动，电极端子5的运动会拉扯极耳6，使得极耳6或者极耳6连接处（包括极耳6与电极端子5连接处，或者极耳6与电芯4的极片连接处）能够部分断裂或完全断裂，从而减弱（极耳6部分断裂后电阻会增大）或阻断电极端子5与电芯4的电连接，即减弱或阻断外部的电器元件与电芯4的电连接，从而有效地抑制电池内部继续产热，提高了电池的安全性能。
在上述实施例中，防爆刻痕7的刻痕深度为电池盖板2厚度的50%-85%。当然，防爆刻痕7的深度也可以根据实际需求来设计。
具体地，防爆刻痕7的整体形状可以根据电极端子5的形状或者电池盖板2的形状来设计，例如电极端子5的形状为矩形，防爆刻痕7也设计成矩形结构。防爆刻痕7的形状、大小、深度和宽度可以根据电池的临界爆破压力来设计。例如，当电池的临界爆破压力较小时，即为了保证电池的安全性能，电池的内部压力较小时就需要对电池盖板2进行爆破，由于电池的内部压力较小，故电池盖板2不容易破裂或爆开。此时可以把防爆刻痕7设计得更接近于环形结构，使得电池盖板2更容易沿着防爆刻痕7破裂或爆开（例如，当把防爆刻痕7设计成L形结构时，在电池的临界爆破压力下电池盖板2不会破裂或爆开；当把防爆刻痕7设计成U形结构时，电池盖板2能够破裂或爆开，即满足实际需求）；或者是可以把防爆刻痕7设计得更大，在相同的压强下，电池盖板2于防爆刻痕7所在位置的受力面积越大，所受的压力也就越大，即电池盖板2更容易沿着防爆刻痕7破裂或爆开；或者是可以把防爆刻痕7的深度设计得更深或把防爆刻痕7的宽度设计得更宽，电池盖板2于防爆刻痕7处的强度更低，使得电池盖板2更容易沿着防爆刻痕7破裂或爆开。反之亦然。此处对于防爆刻痕7的形状、大小和深度不作限定。
如图4至图6所示，本申请的另一实施例提供一种锂离子二次电池1，尤其是一种方形锂离子二次电池，该锂离子二次电池1包括壳体3和电池盖板2，壳体3内封装有电芯4。
在上述实施例中，壳体3的相对两个端部均具有开口31，电池盖板2的数量为两个，分别为第一电池盖板21和第二电池盖板22，第一电池盖板21密封设置在壳体3的其中一个端部的开口31处，第二电池盖板22密封设置在壳体3的另一个端部的开口31处。
在上述实施例中，电池盖板2上设置有电极端子5，电极端子5的数量为两个，分别为第一电极端子51和第二电极端子52，第一电极端子51设置在第一电池盖板21上，第二电极端子52设置在第二电池盖板22上，第一电极端子51与电芯4的一端连接，第二电极端子52与电芯4的另一端连接。
具体地，电芯4具有正极和负极之分，在上述实例中，电芯4的正极和负极分别位于电芯4的相对两端，第一电极端子51和第二电极端子52中的其中一者与电芯4的正极电连接，另外一者与电芯4的负极电连接。
在上述实施例中，第一电池盖板21和第二电池盖板22上均设有防爆刻痕7，防爆刻痕7的数量为两个，分别为第一防爆刻痕71和第二防爆刻痕72，第一防爆刻痕71环绕第一电极端子51设置，第二防爆刻痕72环绕第二电极端子52设置。当然，在其它实施例中，还可以是第一防爆刻痕71环绕或部分围绕第一电极端子51设置，第二防爆刻痕72环绕或部分围绕第二电极端子52设置，在此不作限定。
在上述实施例中，防爆刻痕7为矩形结构，即为封闭的环形结构。具体地，封闭的环形结构还可以为圆形、三角形等结构。当然，在其它实施例中，防爆刻痕7还可以为具有开口的U形、C形或L形等结构，在此不作限定。
在上述实施例中，壳体3内设置有极耳6，电极端子5通过极耳6与电芯4电连接，极耳6的一端与电芯4连接，极耳6的另一端与电极端子5连接。极耳6的数量为两个，其中一个极耳6连接在第一电极端子51与电芯4之间，另外一个极耳6连接在第二电极端子52与电芯4之间，每个极耳6上设有至少一个断裂口8。
在上述实施例中，每个极耳6上设有两个断裂口8，两个断裂口8对称设置在每个极耳6的相对两个侧边上。当然，在其它实施例中，每个极耳6上也可以设置更多个断裂口8，比如三个、四个等，在此不作限定。
具体地，由于断裂口8较小，故对极耳6的导电性能的影响非常小。通过在与设置有防爆刻痕7的电极端子5连接的极耳6上设置断裂口8，使得电池盖板2在破裂或爆开后，电极端子5在拉扯极耳6时，电极端子5更容易将极耳6拉扯断开，从而促使电池形成断路，更加有效地抑制电池内部继续产热，进一步提高电池的安全性能。
在上述实施例中，第一电池盖板21和/或第二电池盖板22上设有注液孔9。
如图7所示，本申请的另一实施例提供一种锂离子二次电池1，与上述实施例不同的是，仅第一电池盖板21或第二电池盖板22中的其中一者设有防爆刻痕7，同时，仅在与设置有防爆刻痕7的电极端子5连接的极耳6上设置断裂口8。具体地，防爆刻痕7环绕第一电极端子51设置，与第一电极端子51连接的极耳6上设置有断裂口8。当然，在其它实施例中，也可以是防爆刻痕7设置在其中一个电池盖板2上，防爆刻痕7部分围绕其中一个电极端子5设置，在此不作限定。
如图8所示，本申请的另一实施例提供一种电池盖板2，电池盖板2上设置有电极端子5，电极端子5的数量为两个，分别为第一电极端子51和第二电极端子52，第一电极端子51和第二电极端子52均设置在电池盖板2上。
在上述实施例中，电池盖板2上还设有防爆刻痕7，防爆刻痕7的数量为一个，防爆刻痕7同时环绕第一电极端子51和第二电极端子52设置。
在上述实施例中，电池盖板2上还设有注液孔9。
在上述实施例中，防爆刻痕7为矩形结构，即为封闭的环形结构。具体地，封闭的环形结构还可以为圆形、三角形等结构。当然，在其它实施例中，防爆刻痕7还可以为具有开口的U形、C形或L形等结构，在此不作限定。
如图9所示，本申请的另一实施例提供一种电池盖板2，与上述实施例不同的是，防爆刻痕7的数量为一个，防爆刻痕7同时部分围绕第一电极端子51和第二电极端子52设置。
如图10所示，本申请的另一种实施例提供一种电池盖板2，与上述实施例不同的是，防爆刻痕7的数量为一个，防爆刻痕7环绕其中一个电极端子5设置。具体地，防爆刻痕7环绕第一电极端子51设置。
如图11所示，本申请的另一种实施例提供一种电池盖板2，与上述实施例不同的是，防爆刻痕7的数量为一个，防爆刻痕7部分围绕其中一个电极端子5设置。具体地，防爆刻痕7部分围绕第一电极端子51设置。
如图12所示，本申请的另一种实施例提供一种电池盖板2，与上述实施例不同的是，防爆刻痕7的数量为两个，分别为第一防爆刻痕71和第二防爆刻痕72，第一防爆刻痕71环绕第一电极端子51设置，第二防爆刻痕72环绕第二电极端子52设置。
如图13所示，本申请的另一种实施例提供一种电池盖板2，与上述实施例不同的是，防爆刻痕7的数量为两个，分别为第一防爆刻痕71和第二防爆刻痕72，第一防爆刻痕71部分围绕第一电极端子51设置，第二防爆刻痕72部分围绕第二电极端子52设置。当然，在其它实施例中，也可以是第一防爆刻痕71环绕第一电极端子51设置，第二防爆刻痕72部分围绕第二电极端子52设置；或者是第一防爆刻痕71部分围绕第一电极端子51设置，第二防爆刻痕72环绕第二电极端子52设置，在此不作限定。
如图14所示，本申请的另一实施例提供一种锂离子二次电池1，尤其是一种方形锂离子电池，该锂离子二次电池1包括壳体3和电池盖板2，壳体3内封装有电芯4。
在上述实施例中，壳体3的一端具有开口31，电池盖板2密封设置在开口31处。
在上述实施例中，电池盖板2上设置有电极端子5，电极端子5的数量为两个，分别为第一电极端子51和第二电极端子52，第一电极端子51和第二电极端子52均设置在电池盖板2上。电芯4的正极和负极位于电芯4的同一端，第一电极端子51和第二电极端子52中的其中一者与电芯4的正极电连接，另外一者与电芯4的负极电连接。
在上述实施例中，防爆刻痕7的数量为一个，防爆刻痕7同时环绕第一电极端子51和第二电极端子52设置。请参见图9，在其它实施例中，还可以是防爆刻痕7同时部分围绕第一电极端子51和第二电极端子52设置。或者是防爆刻痕7的数量为两个（请参见图12及图13），分别为第一防爆刻痕71和第二防爆刻痕72，第一防爆刻痕71环绕或部分围绕第一电极端子51设置，第二防爆刻痕72环绕或部分围绕第二电极端子52设置，在此不作限定。
在上述实施例中，防爆刻痕7为矩形结构，即为封闭的环形结构。具体地，封闭的环形结构还可以为圆形、三角形等结构。当然，在其它实施例中，防爆刻痕7还可以为具有开口的U形、C形或L形等结构，在此不作限定。
在上述实施例中，壳体3内设置有极耳6，电极端子5通过极耳6与电芯4电连接，极耳6的一端与电芯4连接，极耳6的另一端与电极端子5连接。极耳6的数量为两个，其中一个极耳6连接在第一电极端子51与电芯4之间，另外一个极耳6连接在第二电极端子52与电芯4之间，每个极耳6上设有至少一个断裂口8。
在上述实施例中，电池盖板2上还设有注液孔9。
本申请实施例提供的电池盖板2及锂离子二次电池1的优点在于：
1、本申请实施例采用防爆刻痕7的设计，相比在电池盖板2上设置防爆阀的方式，其结构和工艺更加简单，成本更低；
2、本申请实施例采用防爆刻痕7环绕或部分围绕电极端子5的设计，简化了电池的防爆结构的设计，空间布置更加简洁。同时，当电池盖板2在破裂或爆开时能够带动电极端子5一起运动，电极端子5脱离原来的位置并向远离电芯4的方向移动，电极端子5的运动会拉扯极耳6，使得极耳6能够部分断裂或完全断裂，从而减弱或阻断电极端子5与电芯4的电连接，即减弱或阻断外部的电器元件与电芯4的电连接，从而有效地抑制锂离子二次电池1内部继续产热，可提高锂离子二次电池1的防爆效果；
3、本申请实施例通过在与设置有防爆刻痕7的电极端子5连接的极耳6上设置断裂口8，使得电池盖板2在破裂或爆开后，电极端子5在拉扯极耳6时，电极端子5更容易将极耳6拉扯断开，从而促使电池形成断路，有效地抑制电池内部继续产热，进一步提高电池的安全性能。
以上所述，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所述权利要求的保护范围为准。
 工业实用性
本申请提供的电池盖板，通过在电池盖板上设置防爆刻痕，使得电池盖板在电池异常的情况下能够从防爆刻痕处破裂或爆开，电池能够快速泄压，从而实现电池的防爆功能。同时，防爆刻痕环绕或部分围绕设置在电极端子的外围，使得电池盖板在破裂或爆开时能够带动电极端子一起运动，电极端子脱离原来的位置并向远离电芯的方向移动，电极端子的运动会拉扯极耳，使得极耳或者极耳连接处（包括极耳与电极端子连接处，或者极耳与电芯的极片连接处）能够部分断裂或完全断裂，从而减弱或阻断电极端子与电芯的电连接，即减弱或阻断外部的电器元件与电芯的电连接，从而有效地抑制电池内部继续产热，提高了电池的安全性能。

Claims (12)

  1. 一种电池盖板，所述电池盖板（2）上设置有电极端子（5），其特征在于，所述电池盖板（2）上还设有防爆刻痕（7），所述防爆刻痕（7）环绕或部分围绕所述电极端子（5）设置。
  2. 如权利要求1所述的电池盖板，其特征在于，所述电极端子（5）的数量为两个，分别为第一电极端子（51）和第二电极端子（52），所述第一电极端子（51）和所述第二电极端子（52）均设置在所述电池盖板（2）上。
  3. 如权利要求2所述的电池盖板，其特征在于，所述防爆刻痕（7）环绕或部分围绕其中一个电极端子（5）设置，或者所述防爆刻痕（7）同时环绕或部分围绕所述第一电极端子（51）和所述第二电极端子（52）设置。
  4. 如权利要求2所述的电池盖板，其特征在于，所述防爆刻痕（7）的数量为两个，分别为第一防爆刻痕（71）和第二防爆刻痕（72），所述第一防爆刻痕（71）环绕或部分围绕所述第一电极端子（51）设置，和/或所述第二防爆刻痕（72）环绕或部分围绕所述第二电极端子（52）设置。
  5. 如权利要求1所述的电池盖板，其特征在于，所述防爆刻痕（7）为封闭的环形结构，或具有开口的U形或C形结构。
  6. 一种锂离子二次电池，包括壳体（3）和电池盖板（2），所述壳体（3）内封装有电芯（4），所述壳体（3）的端部具有开口（31），所述电池盖板（2）密封设置在所述开口（31）处，所述电池盖板（2）上设置有电极端子（5），其特征在于，所述电池盖板（2）上还设有防爆刻痕（7），所述防爆刻痕（7）环绕或部分围绕所述电极端子（5）设置。
  7. 如权利要求6所述的锂离子二次电池，其特征在于，所述电极端子（5）的数量为两个，分别为第一电极端子（51）和第二电极端子（52），所述第一电极端子（51）和所述第二电极端子（52）均设置在所述电池盖板（2）上。
  8. 如权利要求7所述的锂离子二次电池，其特征在于，所述防爆刻痕（7）环绕或部分围绕其中一个电极端子（5）设置，或者所述防爆刻痕（7）同时环绕或部分围绕所述第一电极端子（51）和所述第二电极端子（52）设置。
  9. 如权利要求7所述的锂离子二次电池，其特征在于，所述防爆刻痕（7）的数量为两个，分别为第一防爆刻痕（71）和第二防爆刻痕（72），所述第一防爆刻痕（71）环绕或部分围绕所述第一电极端子（51）设置，和/或所述第二防爆刻痕（72）环绕或部分围绕所述第二电极端子（52）设置。
  10. 如权利要求6所述的锂离子二次电池，其特征在于，所述防爆刻痕（7）为封闭的环形结构，或具有开口的U形或C形结构。
  11. 如权利要求6所述的锂离子二次电池，其特征在于，所述壳体（3）内设置有极耳（6），所述电极端子（5）通过所述极耳（6）与所述电芯（4）电连接，所述极耳（6）的一端与所述电芯（4）连接，所述极耳（6）的另一端与所述电极端子（5）连接，所述极耳（6）上设有至少一个断裂口（8）。
  12. 如权利要求6所述的锂离子二次电池，其特征在于，所述壳体（3）的相对两个端部均具有所述开口（31），所述电池盖板（2）的数量为两个，分别为第一电池盖板（21）和第二电池盖板（22），所述第一电池盖板（21）密封设置在所述壳体（3）的其中一个端部的开口（31）处，所述第二电池盖板（22）密封设置在所述壳体（3）的另一个端部的开口（31）处，所述第一电池盖板（21）和/或所述第二电池盖板（22）上设有所述防爆刻痕（7）。
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CN211350864U (zh) * 2019-12-31 2020-08-25 惠州亿纬锂能股份有限公司 锂离子电池
CN211879492U (zh) * 2020-04-28 2020-11-06 江苏塔菲尔新能源科技股份有限公司 一种动力电池

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WO2024027813A1 (zh) * 2023-05-31 2024-02-08 惠州亿纬动力电池有限公司 电池盖板、电池及用电设备
WO2026020812A1 (zh) * 2024-07-26 2026-01-29 比亚迪股份有限公司 电池的盖板组件、电池和用电设备

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