WO2018090176A1 - 二次电池及电池模组 - Google Patents

二次电池及电池模组 Download PDF

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Publication number
WO2018090176A1
WO2018090176A1 PCT/CN2016/105860 CN2016105860W WO2018090176A1 WO 2018090176 A1 WO2018090176 A1 WO 2018090176A1 CN 2016105860 W CN2016105860 W CN 2016105860W WO 2018090176 A1 WO2018090176 A1 WO 2018090176A1
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WO
WIPO (PCT)
Prior art keywords
terminal
sheet
secondary battery
top cover
pole piece
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/CN2016/105860
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English (en)
French (fr)
Inventor
林永寿
李全坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Priority to CN202210212263.3A priority Critical patent/CN114614216B/zh
Priority to CN201680088939.5A priority patent/CN109844993B/zh
Priority to PCT/CN2016/105860 priority patent/WO2018090176A1/zh
Publication of WO2018090176A1 publication Critical patent/WO2018090176A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells

Definitions

  • the present application relates to the field of energy storage device production technologies, and in particular, to a secondary battery and a battery module.
  • the commonly adopted scheme in the industry is to cut off the main circuit of the battery before the battery core fails, to prevent the battery from continuing to be charged, so as to ensure the safety of the battery.
  • the common structure is that a current cut-off structure is provided in the main circuit electrically connected to the first terminal and the electrode assembly, and the second terminal is always electrically insulated from the current cut-off structure.
  • the present application provides a secondary battery and a battery module that can solve the above problems.
  • a first aspect of the present application provides a secondary battery including a first terminal, a second terminal, a top cover sheet, an electrode assembly, and a flip sheet,
  • the electrode assembly includes a first pole piece, a second pole piece, and a partition between the first pole piece and the second pole piece;
  • the first terminal is electrically connected to the top cover sheet;
  • the second terminal is electrically insulated from the top cover sheet, and the flip chip is attached to the second terminal;
  • the first pole piece is electrically connected to the first terminal, and the second pole piece is connected
  • the flip chip is electrically connected to the second terminal;
  • the flipper When the pressure in the secondary battery exceeds a reference pressure, the flipper can be turned over to disconnect the flipper from the second pole piece, and the flipped flipper and the top
  • the cover sheet electrical connection electrically connects the first terminal and the second terminal.
  • the second terminal includes an interconnecting terminal body and an extension
  • the extension is provided with a first through hole
  • the flip piece is attached to the extension
  • the first through hole is sealed.
  • a housing that covers the top cover sheet, the top cover sheet enclosing a space with the housing, the receiving space including a first chamber for accommodating the electrode assembly, And a second chamber providing a flip space for the flip sheet, the first chamber being out of communication with the second chamber.
  • a first seal is also provided that achieves a seal between the first chamber and the second chamber, the first seal being sealingly coupled between the extension and the top cover sheet.
  • a first seal is also provided that achieves a seal between the first chamber and the second chamber, the first seal being sealed between the flip sheet and the top cover sheet.
  • the flipping piece includes a turning portion and a first protruding head
  • the inverting portion is a sheet-like toroidal structure, and an edge thereof is connected to the second terminal;
  • the first protrusion is connected to the inversion portion and protrudes in a direction in which the top cover sheet is located;
  • the second pole piece is electrically connected to the extension portion through the inversion portion.
  • the second pole piece is electrically connected to the second terminal through the conductive sheet and the flip sheet in sequence;
  • the flipping sheet When the pressure in the secondary battery exceeds the reference pressure, the flipping sheet can be turned over to disconnect the conductive sheet, thereby disconnecting the electrical connection state of the second terminal and the second pole piece.
  • the conductive sheet comprises a first conductive portion, a second conductive portion and a thinned region,
  • the thinned region is located between the first conductive portion and the second conductive portion, and has a thickness smaller than a thickness of the first conductive portion and a thickness of the second conductive portion;
  • the first conductive portion is connected to the flip sheet; the second conductive portion and the second portion Pole piece connection.
  • the thinned zone is provided with an indentation.
  • the first insulating member is further disposed between the conductive sheet and the extending portion, the first insulating member is provided with a second through hole; the flipping sheet, the first The two through holes and the first conductive portion are opposite.
  • a resistor is further included, and the first terminal and the top cover are electrically connected by the resistor.
  • the first conductive block is further electrically connected to the first terminal, and the first conductive block is electrically connected to the top cover by the resistor.
  • the first conductive block, the resistor member and the top cover sheet are stacked.
  • the resistance of the resistor is from 1 to 100,000 ohms.
  • the first terminal and the cover sheet are of a unitary structure.
  • a second aspect of the present application provides a battery module comprising at least two secondary batteries according to any of the above, each of the secondary batteries being connected in series.
  • the second terminal is provided with a flipping piece. After the battery is overcharged, the air pressure is increased to cause the flipping piece to be turned over, and the flipping piece is disconnected from the second pole piece and electrically connected to the top cover piece. The first terminal and the second terminal are electrically connected. Therefore, after the flipping sheet is reversed, the internal circuit of the faulty secondary battery is disconnected, and the first terminal and the second terminal of the secondary battery are electrically connected. Even if the battery module is connected in series, the secondary battery can be used as a wire to keep the entire battery module in a path state, so that even if the car is in operation, it will not suddenly turn off, improving the safety of the car.
  • FIG. 1 is a schematic structural view of a specific embodiment of a secondary battery provided by the present application.
  • FIG. 2 is an exploded view of a specific embodiment of a secondary battery provided by the present application.
  • Figure 3 is a cross-sectional view taken along line A-A of Figure 1;
  • FIG. 4 is a partial schematic view of a specific embodiment of a secondary battery provided by the present application.
  • FIG. 5 is a schematic structural view of a specific embodiment of a secondary battery flipping sheet provided by the present application.
  • FIG. 6 is a schematic structural view of a specific embodiment of a secondary battery conductive sheet provided by the present application.
  • FIG. 7 is another partial structural schematic view of a specific embodiment of a secondary battery provided by the present application.
  • Figure 8 is a cross-sectional view showing another embodiment of the secondary battery provided by the present application.
  • Figure 9 is a cross-sectional view showing still another embodiment of the secondary battery provided by the present application.
  • the embodiment of the present application provides a secondary battery including a first terminal 30, a second terminal 20, a top cover sheet 10, an electrode assembly (not shown), and a flip sheet 70.
  • the secondary battery further includes a housing (not shown) that is covered with the top cover sheet 10.
  • the electrode assembly includes a first pole piece, a second pole piece, and a spacer between the first pole piece and the second pole piece.
  • the top cover sheet 10 seals the casing, and the two enclose a receiving space.
  • the first terminal 30 is electrically connected to the top cover sheet 10
  • the second terminal 20 is electrically insulated from the top cover sheet 10, which may be insulated by the third insulating member 22, and the flip sheet 70 is attached to the second terminal 20.
  • the first pole piece is electrically connected to the first terminal 30, and the second pole piece is electrically connected to the second terminal 20 through the inverting piece 70; when the pressure in the secondary battery exceeds the reference pressure, the flipping piece 70 can be flipped and flipped
  • the sheet 70 is disconnected from the second pole piece, and the inverted flip piece 70 is electrically connected to the top cover sheet 10 to electrically connect the first terminal 30 and the second terminal 20.
  • the second terminal 20 is provided with the inversion piece 70.
  • the inversion piece 70 is disconnected from the second pole piece and electrically connected to the top cover piece 10, thereby realizing
  • the first terminal 30 and the second terminal 20 are electrically connected. Therefore, after the flipping sheet 70 is reversed, the internal circuit of the faulty secondary battery is disconnected, and the first terminal 30 and the second terminal of the secondary battery are simultaneously made.
  • the terminal 20 is electrically connected, and even if the battery module is connected in series, the secondary battery can serve as a wire and still maintain the entire battery module. In the state of the passage, even if the car is in operation, it will not suddenly turn off, which improves the safety of the car.
  • first terminal 30 and the second terminal 20 are respectively mounted on the top cover sheet 10.
  • the first terminal 30 and the second terminal 20 may both protrude from the top cover sheet 10, in particular, the second terminal 20 is electrically insulated from the top cover sheet 10, and one end of the second terminal 20 protrudes from the top cover sheet 10, as shown in FIG.
  • One end of the first terminal 30 also protrudes from the top cover sheet 10.
  • the first terminal 30 or the second terminal 20 protrudes from the top cover sheet 10
  • it is usually sealed by a seal or a sealant, as shown in FIG.
  • the second terminal 20 is sealed to the top cover sheet 10 by the second sealing member 24; as shown in FIG. 7, the first terminal 30 is sealed with the top cover sheet 10 by the third sealing member 34, and the second sealing member 24 and the third sealing member are sealed.
  • the piece 34 can be a seal ring, a gasket, or the like.
  • a first through hole is provided in the second terminal 20, and the inverting piece 70 seals the first through hole.
  • the setting of the flip sheet 70 is made more convenient by the first through hole.
  • the second terminal 20 includes a terminal body 201 and an extension portion 202 that are connected to each other. As shown in FIGS. 2-4, the first through hole is provided in the extending portion 202.
  • the terminal body 201 and the top cover sheet 10 are insulated by the third insulating member 22, and the terminal body 201 is sealed with the top cover sheet 10 by the second sealing member 24.
  • the terminal body 201 and the extension portion 202 may be of a unitary structure or a separate structure.
  • the accommodating space enclosed by the cover sheet 10 and the casing includes a first chamber for accommodating the electrode assembly, and a second chamber for providing a turning space for the flip sheet 70, that is, the flip sheet 70 separates the accommodating space into the first chamber.
  • a chamber and a second chamber, the first chamber and the second chamber are not in communication to ensure that the flip sheet 70 can be turned over when the pressure in the secondary battery exceeds the reference pressure.
  • the sealing of the first chamber and the second chamber may be achieved by the first seal 73 or the sealant or the like, and the first seal 73 is generally disposed along the outer circumference of the flip sheet 70.
  • the first sealing member 73 is disposed along the outer circumference of the inverting sheet 70, and the first sealing member 73 can be sealingly connected between the second terminal 20 and the top cover sheet 10 (with an extension portion) At 202 o'clock, the seal is connected between the extension portion 202 and the top cover sheet 10, or the first seal member 73 is sealingly connected between the flip sheet 70 and the top cover sheet 10.
  • the first seal 73 has a first sealing surface in sealing contact with the cover sheet 10, and with the extension 202 or The flipping sheet 70 seals the contacted second sealing surface.
  • the first sealing surface and the second sealing surface are opposed to each other in the height direction of the top cover sheet 10.
  • the structure of the flipping sheet 70 is as shown in FIG. 3-5, the flipping sheet 70 includes the inverting portion 701 and the first protruding head 702, and the inverting portion 701 is a sheet-shaped toroidal structure, the edge thereof and the second terminal 20 connection.
  • the first protrusion 702 is connected to the inversion part 701.
  • the first protrusion 702 is connected to the central area of the inversion part 701 and protrudes in the direction in which the top cover sheet 10 is located.
  • the second pole piece passes through the inversion part.
  • 701 is electrically connected to the second terminal 20 (the extension portion 202 when the extension portion 202 is provided).
  • the flipping plate 70 further includes a second protruding head 703, and the second protruding head 703 is connected to the inverting portion 701, and is convex In the direction in which the second pole piece is located, the flip portion 701 is electrically connected to the second pole piece through the second protrusion 703 in the normal state.
  • the end surface of the first protrusion 702 and the end surface of the second protrusion 703 are also planar structures to increase the contact area between the flip sheet 70 and the second pole piece and the inverted flip sheet 70 and the top cover sheet 10, thereby increasing the overcurrent. area.
  • the inverting portion 701 may be entirely located in the first through hole or may be connected to the end of the first through hole.
  • the circumference of the inverting portion 701 is connected to the inner wall of the first through hole to shorten the turning stroke of the flip sheet 70 while ensuring The reliability of connection with the second pole piece and the top cover piece 10 before and after the flipping.
  • the peripheral edge of the reversing portion 701 is further provided with a connecting portion 704.
  • the thickness of the connecting portion 704 is greater than the thickness of the reversing portion 701, and the thickness refers to the flipping along the flipping sheet 70.
  • the size of the direction, the inverting portion 701 is connected to the first through hole through the connecting portion 704.
  • the first through hole is preferably a stepped hole.
  • the connecting portion 704 is overlapped with the stepped surface of the stepped hole.
  • the inverting portion 701 may be overlapped on the stepped surface.
  • the structure can limit the position of the flipping sheet 70, and prevent the loosening of the flipping piece 70 and the second terminal 20 in the normal state, so that the flipping sheet 70 cannot be in contact with the top cover sheet 10 after being turned over.
  • the secondary battery further includes a conductive sheet 71.
  • the second pole piece in a normal state, is electrically connected to the second terminal 20 through the conductive sheet 71 and the flip sheet 70 in sequence;
  • the flipping sheet 70 can be turned over to break the conductive sheet 71, thereby breaking the electrical connection state of the second terminal 20 and the second pole piece, and facilitating the processing and assembly by adding the conductive sheet 71.
  • the conductive sheet 71 is provided with a vent hole, and the vent hole is opposite to the flip sheet 70.
  • the first vent hole 714 or the second vent hole 715, the first vent hole 714 and the second vent hole 715 may be simultaneously disposed.
  • the first vent hole 714 and the second vent hole 715 penetrate the conductive sheet 71 in the reverse direction of the flip sheet 70 so that the gas in the secondary battery can flow to the flip sheet 70, and the flip sheet 70 can be inverted.
  • the reversing portion 701 is provided, in order to ensure the inner short-circuit gas generation, the gas quickly reaches the reversing portion 701, and the second vent hole 715 faces the reversing portion 701.
  • the conductive sheet 71 includes a first conductive portion 711 , a second conductive portion 713 , and a thinned region 712 , and the thinned region 712 is located between the first conductive portion 711 and the second conductive portion 713 , and The thickness of the first conductive portion 711 is smaller than the thickness of the second conductive portion 713; wherein the first conductive portion 711 is connected to the flipping plate 70, and when the second protruding portion 703 is provided, directly connected to the second protruding portion 703 The second conductive portion 713 is connected to the second pole piece.
  • the flip chip 70 is electrically connected to the second pole piece through the first conductive portion 711, the thinned region 712, and the second conductive portion 713.
  • the first conductive portion 711 is connected to the flip sheet 70
  • the second conductive portion 713 is connected to the second pole piece.
  • the thinned portion 712 may be provided with an indentation and a broken portion, or only one of an indentation and a broken portion may be provided, wherein When the disconnecting portion is provided, the first conductive portion 711 and the second conductive portion 713 are disconnected at the disconnecting portion.
  • the first conductive portion 711 is further provided with a mounting hole
  • the flipping plate 70 is provided with a mounting protrusion 705
  • the mounting protrusion 705 can be connected to the second protruding head 703
  • the mounting protrusion 705 is inserted into the mounting hole to ensure the conductive sheet 71 and the flipping
  • the connection accuracy of the sheet 70 ensures that the conductive sheet 71 can be broken by a predetermined pulling force.
  • the mounting hole can be a through hole or a blind hole. When it is a through hole, it may be the same through hole as the first vent hole 714.
  • the contact between the conductive sheet 71 and the first terminal 20 is achieved by an insulating structure, an insulating glue or an insulating varnish, and the insulating structure may be the first insulating member 72 as shown in FIG.
  • the first insulating member 72 is located between the conductive sheet 71 and the flipping sheet 70.
  • the first insulating member 72 is provided with a second through hole, and the flipping sheet 70, the second through hole and the first conductive portion 711 are opposite to each other.
  • the first insulating member 72 and the third insulating member 22 may be a unitary structure.
  • the second conductive portion 713 can be fixed to the second terminal 20 by means of bonding, screwing, etc., in order to better fix the conductive sheet 71 and thereby ensure that the flip sheet 70 can be electrically disconnected therefrom after being turned over, the conductive sheet 71 can pass the first insulation.
  • the member 72 is fixed to the first terminal 20. In this manner, the first insulating member 72 serves as both insulation and fixing, saving the number of components and simplifying the assembly process.
  • the top cover sheet 10 is further provided with a vent hole which faces the flip sheet 70 and penetrates in the thickness direction of the top cover sheet 10.
  • the secondary battery further includes a second conductive block 21, and the second conductive block 21 is electrically insulated from the second terminal 20, which may pass through the fourth insulating member 23, insulating rubber or insulation. Paint insulation.
  • the first terminal 30 and the top cover 10 are electrically connected to each other, as shown in FIG.
  • the connection is reliable; or is connected to the top cover sheet 10 through a conductive structure.
  • a second insulating member 32 is disposed between the top cover sheet 10 and the first terminal, and the conductive structure may be a conductive block, as shown in FIG.
  • the first conductive block 31 is in contact contact electrical connection with the first terminal 30, that is, the first terminal 30 is connected to the top cover sheet 10 through the first conductive block 31, wherein the first terminal 30 and the top cover sheet 10 are
  • the first terminal 30 and the first conductive block 31 are respectively connected to the two sides of the top cover sheet 10, and the latter two, respectively, may be directly connected to the electrical connection, or may be directly connected to the electrical connection. A way to facilitate the electrical connection between the secondary battery and the outside world.
  • the secondary battery further includes a resistor member 33, and the first terminal 30 is electrically connected to the top cover sheet 10 through the resistor member 33, and can be worn on the secondary battery by adding the resistor member 33. During the nail test, the current of the short circuit is reduced to ensure the safety of the nail.
  • the resistor member 33 may be a columnar structure or a sheet-like structure. When the sheet-like structure is used, the first conductive block 31, the resistor member 33 and the top cover sheet 10 may be stacked, as shown in FIG. 7, to increase the reliability of the connection.
  • the first conductive block 31 and the top cover sheet 10 are electrically insulated by the fifth insulating member or the insulating varnish and the insulating rubber. After the resisting member 33 passes through the fifth insulating member, the two ends are respectively connected to the top cover 10 The first conductive block 31 is electrically connected.
  • the top cover 10 is provided with a first recess, and one end of the resistive member 33 electrically connected to the top cover 10 is inserted into the first recess; and the first conductive block 31 is provided. a second recess, the other end of the resistor 33 is inserted into the second recess to prevent misalignment of the resistor 33; of course, only the top cover 10 may be provided with a first recess, or the first conductive block 31 may be provided with a first recess Two grooves.
  • the resistance of the resistor 33 is usually from 1 to 100,000 ohms, such as 1 ohm, 100 ohms, 1000 ohms, and 100,000 ohms.
  • the first terminal 30 is a positive terminal
  • the second terminal 20 is a negative terminal
  • the first pole piece is a positive electrode piece
  • the second pole piece is a negative electrode piece to prevent electrolyte against the housing. Corrosion.
  • the first terminal 30 is a negative terminal
  • the second terminal 20 is a positive terminal
  • the first pole piece is a negative electrode piece
  • the second pole piece is a positive electrode piece.
  • the present application also provides a battery module comprising the secondary battery provided by any of the above embodiments.
  • the secondary battery is provided in plurality, and the secondary batteries may be connected in parallel with each other or in series with each other. Especially in the case of series connection, the secondary battery of any of the above embodiments is used, and even if an accident occurs, the flip sheet 70 is activated, This will cause the entire battery module to be powered down, thus ensuring the stability of the battery module.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种二次电池及电池模组, 涉及储能器件生产技术领域，所述二次电池包括第一端子（30）、第二端子（20）、顶盖片（10）、电极组件和翻转片（70），电极组件包括第一极片和第二极片，第一端子（30）与顶盖片（10）电连接；第二端子（20）与顶盖片（10）电绝缘，翻转片（70）附接于第二端子（20）；常态时，第一极片与第一端子（30）电连接，第二极片通过翻转片（70）与第二端子（20）电连接；当二次电池内的压力超过基准压力时，翻转片（70）能够翻转使翻转片（70）断开与第二极片的电连接状态，并且翻转后的翻转片（70）与顶盖片（10）电连接使第一端子（30）和第二端子（20）电连接。由此，即便汽车处于运行状态，也不会突然熄火，提高了汽车的安全性。

Description

二次电池及电池模组 技术领域
本申请涉及储能器件生产技术领域，尤其涉及一种二次电池及电池模组。
背景技术
对于EV硬壳电池，为了解决过充问题，业界普遍采用的方案是，在电芯失效之前切断电池主回路，防止电池继续充电，以保证电池安全。通常的结构为：在第一端子与电极组件电连接的主回路设置电流切断结构，且第二端子始终与电流切断结构电绝缘，当电池过充，内部产气，在内部气压增大到一定值时激活电流切断结构，使第一端子与电极组件之间断路，防止电池继续充电。
然而，除了过充以外，正常使用过程中，可能也会由于意外的内短路导致内部产气，激活电流切断结构，使第一端子与电极组件之间形成断路，如果此时汽车正在行驶中，而电池模组中各二次电池又采用串联的方式，由于第一端子与第二端子仍处于绝缘状态，将导致整个电池模组发生断电，造成汽车突然熄火，甚至导致严重的事故。
发明内容
本申请提供了一种二次电池及电池模组，能够解决上述问题。
本申请的第一方面提供了一种二次电池，包括第一端子、第二端子、顶盖片、电极组件和翻转片，
所述电极组件包括第一极片、第二极片和在所述第一极片与所述第二极片之间的隔板；
所述第一端子与所述顶盖片电连接；所述第二端子与所述顶盖片电绝缘，所述翻转片附接于所述第二端子；
常态时，所述第一极片与所述第一端子电连接，所述第二极片通 过所述翻转片与所述第二端子电连接；
当所述二次电池内的压力超过基准压力时，所述翻转片能够翻转使所述翻转片断开与所述第二极片的电连接状态，并且翻转后的所述翻转片与所述顶盖片电连接使所述第一端子和所述第二端子电连接。
优选地，所述第二端子包括互相连接的端子本体和延伸部，所述延伸部设有第一通孔，所述翻转片附接于所述延伸部，且密封所述第一通孔。
优选地，还包括与所述顶盖片盖合的壳体，所述顶盖片与所述壳体围成容纳空间，所述容纳空间包括用于容纳所述电极组件的第一腔室，和为所述翻转片提供翻转空间的第二腔室，所述第一腔室与所述第二腔室不连通。
优选地，还包括实现所述第一腔室与所述第二腔室之间密封的第一密封件，所述第一密封件密封连接于所述延伸部与所述顶盖片之间。
优选地，还包括实现所述第一腔室与所述第二腔室之间密封的第一密封件，所述第一密封件密封于所述翻转片与所述顶盖片之间。
优选地，所述翻转片包括翻转部与第一凸头，
所述翻转部为片状环面结构，其边缘与所述第二端子连接；
所述第一凸头连接于所述翻转部，且向所述顶盖片所在的方向突出；
常态时，所述第二极片通过所述翻转部与所述延伸部电连接。
优选地，还包括导电片，常态时，所述第二极片依次通过所述导电片、所述翻转片与所述第二端子电连接；
当所述二次电池内的压力超过基准压力时，所述翻转片能够翻转使所述导电片断开，从而断开所述第二端子与所述第二极片的电连接状态。
优选地，所述导电片包括第一导电部、第二导电部和减薄区，
所述减薄区位于所述第一导电部与所述第二导电部之间，且其厚度小于所述第一导电部的厚度与所述第二导电部的厚度；
所述第一导电部与所述翻转片连接；所述第二导电部与所述第二 极片连接。
优选地，所述减薄区设有压痕。
优选地，还包括第一绝缘件，所述第一绝缘件位于所述导电片与所述延伸部之间，所述第一绝缘件设有第二通孔；所述翻转片、所述第二通孔以及所述第一导电部相对。
优选地，还包括电阻件，所述第一端子与所述顶盖片通过所述电阻件电连接。
优选地，还包括第一导电块，所述第一导电块与所述第一端子接触电连接，所述第一导电块通过所述电阻件与所述顶盖片电连接。
优选地，所述第一导电块、所述电阻件与所述顶盖片层叠设置。
优选地，所述电阻件的阻值为1～100000欧姆。
优选地，所述第一端子与所述顶盖片为一体结构。
本申请的第二方面提供了一种电池模组，包括至少两个如上述任一项所述的二次电池，各所述二次电池相互串联。
本申请提供的技术方案可以达到以下有益效果：
本申请所提供的二次电池，第二端子设置翻转片，在电池发生过充后气压增大使翻转片翻转后，翻转片与第二极片断开电连接状态，且与顶盖片电连接，实现了第一端子、第二端子电连接，因此，在翻转片翻转后，既实现了故障二次电池的内部电路断开，同时又使该二次电池的第一端子与第二端子电导通，即使电池模组采用串联方式，该二次电池能够作为导线，仍然保持整个电池模组处于通路状态，这样，即便汽车处于运行状态，也不会突然熄火，提高了汽车的安全性。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性的，并不能限制本申请。
附图说明
图1为本申请所提供的二次电池一种具体实施例的结构示意图；
图2为本申请所提供的二次电池一种具体实施例的爆炸视图；
图3为图1中沿A-A线的剖视图；
图4为本申请所提供的二次电池一种具体实施例的局部示意图；
图5为本申请所提供的二次电池翻转片一种具体实施例的结构示意图；
图6为本申请所提供的二次电池导电片一种具体实施例的结构示意图；
图7为本申请所提供的二次电池一种具体实施例的另一局部结构示意图；
图8为本申请所提供的二次电池另一种具体实施例的剖视图；
图9为本申请所提供的二次电池又一种具体实施例的剖视图。
附图标记：
10-顶盖片；
20-第二端子；
201-端子本体；
202-延伸部；
21-第二导电块；
22-第三绝缘件；
23-第四绝缘件；
24-第二密封件；
30-第一端子；
31-第一导电块；
32-第二绝缘件；
33-电阻件；
34-第三密封件；
70-翻转片；
701-翻转部；
702-第一凸头；
703-第二凸头；
704-连接部；
705-安装凸起；
71-导电片；
711-第一导电部；
712-减薄区；
713-第二导电部；
714-第一通气孔；
715-第二通气孔；
72-第一绝缘件；
73-第一密封件。
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并与说明书一起用于解释本申请的原理。
具体实施方式
下面通过具体的实施例并结合附图对本申请做进一步的详细描述。
如图1-9所示，本申请实施例提供了一种二次电池，包括第一端子30、第二端子20、顶盖片10、电极组件(图中未示出)和翻转片70，二次电池还包括与顶盖片10盖合的壳体(图中未示出)。电极组件包括第一极片、第二极片和在第一极片与该第二极片之间的隔板。
顶盖片10密封壳体，二者围成容纳空间。第一端子30与顶盖片10电连接，第二端子20与顶盖片10电绝缘，其可以通过第三绝缘件22绝缘，翻转片70附接于第二端子20上。常态时，第一极片与第一端子30电连接，第二极片通过翻转片70与第二端子20电连接；当二次电池内的压力超过基准压力时，翻转片70能够翻转使翻转片70断开与第二极片的电连接状态，并且翻转后的翻转片70与顶盖片10电连接，使第一端子30和第二端子20电连接。
上述实施例的二次电池，第二端子20设置翻转片70，在电池发生内短路使翻转片70翻转后，翻转片70与第二极片断开，且与顶盖片10电连接，实现了第一端子30、第二端子20的电连接，因此，在翻转片70翻转后，既实现了故障二次电池的内部电路断开，同时又使该二次电池的第一端子30与第二端子20电导通，即使电池模组采用串联方式，该二次电池能够作为导线，仍然保持整个电池模组处 于通路状态，这样，即便汽车处于运行状态，也不会突然熄火，提高了汽车的安全性。
一般地，第一端子30、第二端子20分别安装于顶盖片10。第一端子30、第二端子20可以均伸出顶盖片10，尤其第二端子20与顶盖片10电绝缘，第二端子20的一端伸出顶盖片10，如图3所示，第一端子30的一端也伸出顶盖片10。
在第一端子30或者第二端子20伸出顶盖片10时，为了保证第一端子30、第二端子20与顶盖片10的密封性，通常通过密封件或者密封胶密封，如图4中，第二端子20通过第二密封件24与顶盖片10密封；如图7中，第一端子30通过第三密封件34与顶盖片10密封，第二密封件24、第三密封件34可以为密封圈，密封垫等。
通常，如图3、4所示，第二端子20上设置第一通孔，翻转片70密封第一通孔。通过第一通孔，使翻转片70的设置更方便。
为了方便第二端子20与翻转片70的连接，第二端子20包括相互连接的端子本体201和延伸部202，如图2-4所示，第一通孔设于延伸部202。一般地，端子本体201与顶盖片10通过第三绝缘件22绝缘，且端子本体201通过第二密封件24与顶盖片10密封，在第二端子20伸出顶盖片10时，通常端子本体201的一端伸出顶盖片10。端子本体201与延伸部202可以为一体结构，也可以为分体结构。
通常，顶盖片10与壳体围成的容纳空间包括用于容纳电极组件的第一腔室，和为翻转片70提供翻转空间的第二腔室，即翻转片70将容纳空间分隔为第一腔室和第二腔室，第一腔室与第二腔室不连通，以保证翻转片70在二次电池内的压力超过基准压力时能够翻转。
具体地，第一腔室与第二腔室的密封可以通过第一密封件73或者密封胶等实现，第一密封件73通常沿翻转片70的外周向设置。在通过第一密封件73实现时，第一密封件73沿翻转片70的外周向设置，第一密封件73可以密封连接于第二端子20与顶盖片10之间(在设有延伸部202时密封连接于延伸部202与顶盖片10之间)，或者第一密封件73密封连接于翻转片70与顶盖片10之间。第一密封件73具有与顶盖片10密封接触的第一密封面，以及与延伸部202或者 翻转片70密封接触的第二密封面，通常，第一密封面与第二密封面在顶盖片10的高度方向上相对。
上述各实施例中，翻转片70的结构如图3-5所示，翻转片70包括翻转部701与第一凸头702，翻转部701为片状环面结构，其边缘与第二端子20连接。第一凸头702连接于翻转部701，通常第一凸头702连接于翻转部701的中心区域，且向顶盖片10所在的方向凸出，以在常态时，第二极片通过翻转部701与第二端子20(在设有延伸部202时为延伸部202)电连接。通过增加第一凸头702，能够减小翻转片70与顶盖片10在翻转片70翻转方向上的距离，以在发生过充时，翻转片70能够迅速与顶盖片10接触。
为了减小翻转片70翻转的行程，以及保证翻转片70与第二极片的连接可靠性，翻转片70还包括第二凸头703，第二凸头703连接于翻转部701，且凸向第二极片所在的方向，常态时翻转部701通过第二凸头703与第二极片电连接。
第一凸头702的端面、第二凸头703的端面也为平面结构，以增加翻转片70与第二极片以及翻转后的翻转片70与顶盖片10的接触面积，从而增加过流面积。
翻转部701可以整个位于第一通孔内，也可以连接于第一通孔的端部，优选翻转部701的周缘连接于第一通孔的内壁，以缩短翻转片70的翻转行程，同时保证翻转前后分别与第二极片、顶盖片10的连接可靠性。
进一步地，为了保证翻转片70与顶盖片10连接的可靠性，翻转部701的周缘还设有连接部704，连接部704的厚度大于翻转部701的厚度，厚度指沿翻转片70的翻转方向的尺寸，翻转部701通过连接部704连接于第一通孔。
其中，第一通孔优选为阶梯孔，如图4所示，连接部704搭接于阶梯孔的阶梯面，在仅设有翻转部701时，也可以翻转部701搭接于阶梯面，上述结构，能够限制翻转片70的位置，防止在常态时，由于翻转片70与第二端子20连接松动，造成翻转片70翻转后无法与顶盖片10接触。
为了连接的方便性，二次电池还包括导电片71，如图4所示，常态时，第二极片依次通过导电片71、翻转片70与第二端子20电连接；当二次电池内的压力超过基准压力时，翻转片70能够翻转使导电片71断开，从而断开第二端子20与第二极片的电连接状态，通过增加导电片71方便加工和装配。
通常，导电片71设有通气孔，通气孔与翻转片70相对，如图6中，第一通气孔714或者第二通气孔715，也可以同时设置第一通气孔714和第二通气孔715。第一通气孔714，第二通气孔715在翻转片70的翻转方向上贯通导电片71，以使二次电池内的气体能够流通到翻转片70，进而使翻转片70翻转。在设有翻转部701时，为了保证内短路产气时，气体快速地抵达翻转部701，第二通气孔715与翻转部701相对。
具体地，如图6所示，导电片71包括第一导电部711、第二导电部713和减薄区712，减薄区712位于第一导电部711与第二导电部713之间，且其厚度小于第一导电部711的厚度与第二导电部713的厚度；其中，第一导电部711与翻转片70连接，在设有第二凸头703时，直接与第二凸头703连接；第二导电部713与第二极片连接。常态时，翻转片70通过第一导电部711、减薄区712、第二导电部713与第二极片电连接。通过设置减薄区712，同时将第一导电部711与翻转片70连接，第二导电部713与第二极片连接，在翻转片70翻转时，能够快速将导电片71在减薄区712处拉断，从而快速实现二次电池内的断路。
进一步地，为了在较小的拉力下能够将导电片71拉断，减薄区712可以设有压痕和断开部，或者仅设有压痕和断开部中的一种，其中，在设有断开部时，第一导电部711与第二导电部713在断开部断开。
通常第一导电部711还设有安装孔，翻转片70设有安装凸起705，安装凸起705可以连接于第二凸头703，安装凸起705插入安装孔，以保证导电片71与翻转片70的连接精度，进而保证在预设的拉力作用下，能够将导电片71拉断。安装孔可以为通孔，也可以为盲孔， 在为通孔时，可以与第一通气孔714为同一个通孔。
为了防止导电片71与第一端子20的电连接，导电片71与第一端子20的接触处通过绝缘结构、绝缘胶或者绝缘漆实现，绝缘结构可以为如图4中的第一绝缘件72，第一绝缘件72位于导电片71与翻转片70之间，第一绝缘件72设有第二通孔，翻转片70、第二通孔以及第一导电部711相对。其中，第一绝缘件72与第三绝缘件22可以为一体结构。
第二导电部713可以通过粘接、螺钉等方式与第二端子20固定，为了更好地固定导电片71进而保证翻转片70翻转后能迅速与其电断开，导电片71可以通过第一绝缘件72固定于第一端子20，这种方式，第一绝缘件72同时起到绝缘与固定的作用，节省零部件数量，简化装配工序。
此外，为了避免第二腔室的气压阻碍翻转片70的翻转，顶盖片10还设有排气孔，排气孔与翻转片70相对，且沿顶盖片10的厚度方向贯通。
为了进一步方便第二端子20与外界的电连接，二次电池还包括第二导电块21，第二导电块21与第二端子20电绝缘，其可以通过第四绝缘件23、绝缘胶或者绝缘漆绝缘。
第一端子30与顶盖片10的电连接，可以直接连接于顶盖片10，如图9所示，此时，第一端子30可以与顶盖片10为一体结构，进而增加二者电连接的可靠性；或者通过导电结构连接于顶盖片10，此时，顶盖片10与第一端子之间设有第二绝缘件32，导电结构可以为导电块，如图7所示，为第一导电块31，第一导电块31与第一端子30接触接触电连接，即第一端子30通过第一导电块31连接于顶盖片10，其中第一端子30与顶盖片10可以直接接触电连接，也可以不直接接触电连接，通过过渡件连接；也可以如图8所示，第一端子30与第一导电块31分别连接于顶盖片10的两侧，后两种方式，方便二次电池与外界的电连接。
进一步地，二次电池还包括电阻件33，第一端子30通过电阻件33与顶盖片10电连接，通过增加电阻件33，能够在二次电池进行穿 钉试验时，减小短路回路的电流，保证穿钉的安全性。
在第一导电块31与顶盖片10不接触电连接时，第一导电块31通过电阻件33与顶盖片10电连接。电阻件33可以为柱状结构、片状结构，在为片状结构时，第一导电块31、电阻件33与顶盖片10可以层叠设置，如图7所示，以增加连接的可靠性。在为柱状结构时，第一导电块31与顶盖片10之间通过第五绝缘件或者绝缘漆、绝缘胶电绝缘，电阻件33穿过第五绝缘件后，两端分别与顶盖10、第一导电块31电连接，此时，可以顶盖片10设有第一凹槽，电阻件33与顶盖片10电连接的一端插入第一凹槽；且第一导电块31设有第二凹槽，电阻件33的另一端插入第二凹槽，以防止电阻件33的错位；当然，也可以仅顶盖片10设有第一凹槽，或者第一导电块31设有第二凹槽。
为了使穿钉的损坏降到最低，电阻件33的阻值通常为1～100000欧姆，如1欧姆，100欧姆，1000欧姆，100000欧姆。
上述各实施例中，通常，第一端子30为正极端子，第二端子20为负极端子，相应地，第一极片为正极片，第二极片为负极片，以防止电解液对壳体的腐蚀。当然，也可以第一端子30为负极端子，第二端子20为正极端子，相应地，第一极片为负极片，第二极片为正极片。
本申请还提供一种电池模组，包括如上任一实施例提供的二次电池。二次电池设有多个，各二次电池之间可以相互并联，也可相互串联，尤其在串联时，采用上述任一实施例的二次电池，即使发生意外造成翻转片70激活，也不会导致整个电池模组断电，从而保证了电池模组的稳定性。
以上所述仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (16)

  1. 一种二次电池，其特征在于，包括第一端子、第二端子、顶盖片、电极组件和翻转片，
    所述电极组件包括第一极片、第二极片和在所述第一极片与所述第二极片之间的隔板；
    所述第一端子与所述顶盖片电连接；所述第二端子与所述顶盖片电绝缘，所述翻转片附接于所述第二端子；
    常态时，所述第一极片与所述第一端子电连接，所述第二极片通过所述翻转片与所述第二端子电连接；
    当所述二次电池内的压力超过基准压力时，所述翻转片能够翻转使所述翻转片断开与所述第二极片的电连接状态，并且翻转后的所述翻转片与所述顶盖片电连接使所述第一端子和所述第二端子电连接。
  2. 根据权利要求1所述的二次电池，其特征在于，所述第二端子包括互相连接的端子本体和延伸部，所述延伸部设有第一通孔，所述翻转片附接于所述延伸部，且密封所述第一通孔。
  3. 根据权利要求2所述的二次电池，其特征在于，还包括与所述顶盖片盖合的壳体，所述顶盖片与所述壳体围成容纳空间，所述容纳空间包括用于容纳所述电极组件的第一腔室，和为所述翻转片提供翻转空间的第二腔室，所述第一腔室与所述第二腔室不连通。
  4. 根据权利要求3所述的二次电池，其特征在于，还包括实现所述第一腔室与所述第二腔室之间密封的第一密封件，所述第一密封件密封连接于所述延伸部与所述顶盖片之间。
  5. 根据权利要求3所述的二次电池，其特征在于，还包括实现所述第一腔室与所述第二腔室之间密封的第一密封件，所述第一密封件密封于所述翻转片与所述顶盖片之间。
  6. 根据权利要求2所述的二次电池，其特征在于，所述翻转片包括翻转部与第一凸头，
    所述翻转部为片状环面结构，其边缘与所述第二端子连接；
    所述第一凸头连接于所述翻转部，且向所述顶盖片所在的方向突 出；
    常态时，所述第二极片通过所述翻转部与所述延伸部电连接。
  7. 根据权利要求2所述的二次电池，其特征在于，还包括导电片，常态时，所述第二极片依次通过所述导电片、所述翻转片与所述第二端子电连接；
    当所述二次电池内的压力超过基准压力时，所述翻转片能够翻转使所述导电片断开，从而断开所述第二端子与所述第二极片的电连接状态。
  8. 根据权利要求7所述的二次电池，其特征在于，所述导电片包括第一导电部、第二导电部和减薄区，
    所述减薄区位于所述第一导电部与所述第二导电部之间，且其厚度小于所述第一导电部的厚度与所述第二导电部的厚度；
    所述第一导电部与所述翻转片连接；所述第二导电部与所述第二极片连接。
  9. 根据权利要求8所述的二次电池，其特征在于，所述减薄区设有压痕。
  10. 根据权利要求7所述的二次电池，其特征在于，还包括第一绝缘件，所述第一绝缘件位于所述导电片与所述延伸部之间，所述第一绝缘件设有第二通孔；所述翻转片、所述第二通孔以及所述第一导电部相对。
  11. 根据权利要求2-10任一项所述的二次电池，其特征在于，还包括电阻件，所述第一端子与所述顶盖片通过所述电阻件电连接。
  12. 根据权利要求11所述的二次电池，其特征在于，还包括第一导电块，所述第一导电块与所述第一端子接触电连接，所述第一导电块通过所述电阻件与所述顶盖片电连接。
  13. 根据权利要求12所述的二次电池，其特征在于，所述第一导电块、所述电阻件与所述顶盖片层叠设置。
  14. 根据权利要求11所述的二次电池，其特征在于，所述电阻件的阻值为1～100000欧姆。
  15. 根据权利要求1-10任一项所述的二次电池，其特征在于， 所述第一端子与所述顶盖片为一体结构。
  16. 一种电池模组，其特征在于，包括至少两个如权利要求1-15任一项所述的二次电池，各所述二次电池相互串联。
PCT/CN2016/105860 2016-11-15 2016-11-15 二次电池及电池模组 Ceased WO2018090176A1 (zh)

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