WO2018103094A1 - 二次电池 - Google Patents

二次电池 Download PDF

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Publication number
WO2018103094A1
WO2018103094A1 PCT/CN2016/109288 CN2016109288W WO2018103094A1 WO 2018103094 A1 WO2018103094 A1 WO 2018103094A1 CN 2016109288 W CN2016109288 W CN 2016109288W WO 2018103094 A1 WO2018103094 A1 WO 2018103094A1
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WO
WIPO (PCT)
Prior art keywords
top cover
connecting plate
cover sheet
secondary battery
sheet
Prior art date
Application number
PCT/CN2016/109288
Other languages
English (en)
French (fr)
Inventor
陈柏松
王志宇
王鹏
蔡如来
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2016/109288 priority Critical patent/WO2018103094A1/zh
Publication of WO2018103094A1 publication Critical patent/WO2018103094A1/zh

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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
    • 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 of a single cell or a single battery
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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 energy storage device production technologies, and in particular, to a secondary battery.
  • 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: a main circuit is electrically connected to the first terminal and the electrode assembly is provided with a current cut-off structure, and the second terminal is always electrically insulated from the current cut-off structure.
  • the internal gas is generated, so that the internal air pressure is increased to a certain value.
  • the current cut-off structure is activated to open the circuit between the first terminal and the electrode assembly to prevent the battery from continuing to be charged.
  • the battery is subjected to the nailing test, that is, when the metal nail penetrates into the casing or the top cover sheet, the heat generated at the nailing is severe, and even the fire is caused, so that the battery loses control and fire and explosion occur.
  • the flip chip is attached to the connection plate, but the flip chip is directly connected to the top cover piece, and the battery with such a current cut structure cannot add an additional resistance member to the top cover piece, so It is impossible to pass the nail test.
  • a resistor member having a large resistance value is disposed between the first terminal and the top cover sheet, so that the first terminal passes through the resistor member and The top cover piece is electrically connected, thereby reducing the current in the loop during the nailing process and preventing the battery core from losing control.
  • the first terminal since the first terminal needs to be electrically connected to the top cover piece through the resistor member, the first terminal and the top cover piece cannot be directly in contact, so that the first terminal and the top cover piece cannot be soldered, usually by gluing.
  • the adhesive is greatly affected by environmental factors such as temperature, and is easily loosened, resulting in a decrease in the reliability of the connection between the first terminal and the top cover.
  • the present application provides a secondary battery that can solve the above problems.
  • the present application provides a secondary battery including a first terminal assembly, a second terminal assembly, a top cover sheet, an electrode assembly, a fixing member, and a resistor member.
  • 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 assembly includes a connecting plate and a flipping piece, and the flipping piece is attached to the connecting plate;
  • One of the first terminal assembly and the second terminal assembly is electrically connected to the top cover sheet through the resistor member; the other is electrically insulated from the top cover sheet;
  • the connecting plate is fixed to the top cover sheet by the fixing member
  • the first pole piece is electrically connected to the connecting plate through the flipping piece, and the second pole piece is electrically connected to the second terminal component;
  • the flipper When the pressure in the secondary battery exceeds the reference pressure, the flipper can be turned over to disconnect the electrical connection state of the flipper and the first pole piece.
  • the first terminal assembly is electrically connected to the top cover sheet through the resistor member, and the second terminal assembly is electrically insulated from the top cover sheet.
  • the connecting plate is provided with a second through hole, the fixing member and the top cover piece are integrally formed, the fixing member is inserted into the second through hole and is riveted and fixed with the connecting plate, and The fixing member is not in direct contact with the connecting plate;
  • the top cover sheet is provided with a third through hole, the fixing member and the connecting plate are integrally formed, the fixing member is inserted into the third through hole, and is riveted and fixed with the top cover piece, and the The fixing member is not in direct contact with the top cover sheet.
  • the connecting plate is provided with a second through hole
  • the top cover piece is provided with a third through hole
  • the connecting plate passes through the second through hole and the third through hole through the fixing member Fixed to the top cover sheet, and the fixing member is not in direct contact with the connecting plate and/or the fixing member is not in direct contact with the top cover sheet.
  • the fixing member is provided with a first stopping portion, the first stopping portion is located at a side of the connecting plate away from the top cover sheet, and stops at the connecting plate;
  • the fixing member is provided with a second stopping portion, and the second stopping portion is located at the top cover sheet Off the side of the connecting plate and stopping at the top cover sheet.
  • the second through hole is a stepped hole, and the second through hole includes a first stepped surface, and the first stopping portion is in contact with the first stepped surface.
  • a first seal is further included, the first seal being sealingly coupled between the second stop and the top cover sheet.
  • the connecting plate is located on a side of the top cover sheet away from the electrode assembly, the top cover sheet is provided with a first through hole; the connecting plate is disposed on a side close to the top cover sheet
  • the flipper flips to provide a recess for the space, the recess, the flipper and the first via being sequentially opposite.
  • the first terminal assembly further includes a conductive sheet
  • the flip chip In a normal state, the flip chip is electrically connected to the first pole piece through the conductive sheet; when the pressure in the secondary battery exceeds a reference pressure, the flipping sheet is turned over to break the conductive sheet, thereby breaking The electrical connection state of the connecting plate and the first pole piece is opened.
  • the conductive sheet is inserted into the first through hole.
  • 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 is inserted into the first through hole and connected to the first pole piece.
  • the flipping piece comprises a turning portion and a protruding head
  • the inverting portion is a sheet-like toroidal structure, and an edge thereof is connected to the connecting plate;
  • the protrusion is connected to the inversion portion and protrudes in a direction in which the electrode assembly is located, and is connected to the first conductive portion;
  • the connecting plate is electrically connected to the first pole piece through the inverting portion, the protruding head, the first conductive portion, the thinned portion, and the second conductive portion;
  • the inverting portion When the pressure in the secondary battery exceeds a reference pressure, the inverting portion is turned over to disconnect the first conductive portion from the second conductive portion, so that the connection plate and the first pole piece are electrically The connection status is broken.
  • a first member is further disposed between the connecting plate and the top cover sheet, and the first structure
  • the member is an insulating member; the fixing member passes through the first member; and the second conductive portion is electrically connected to the top cover sheet through the resistor member.
  • the conductive sheet being fixed to the top cover sheet by the second member; the resistor member and the second member being of a unitary structure.
  • the first member and the second member are disposed, the first member is disposed between the connecting plate and the top cover sheet, and the conductive sheet is fixed to the top cover sheet by the second member.
  • the fixing member is sequentially fixed to the second member, the top cover sheet, and the first member and the connecting plate.
  • the second member is provided with a fifth through hole for the fixing member to pass through, the fifth through hole is a stepped hole, and the fifth through hole includes a second stepped surface, the second stop The moving portion is in contact with the second step surface.
  • the resistor is disposed between the connecting plate and the top cover, and the connecting plate is electrically connected to the top cover by the resistor.
  • the second member is further provided as an insulating member, and the second member is disposed between the second conductive portion and the first through hole.
  • a first member is further disposed between the connecting plate and the top cover sheet, the resistor member and the first member are a unitary structure, the connecting plate, the resistor member and the top cover The sheets are stacked; the fastener passes through the first member.
  • the resistance of the resistor is from 1 to 100,000 ohms.
  • the fixing member is added, and the connecting plate and the top cover sheet are fixedly connected by the fixing member, thereby avoiding the influence of the instability of the bonding adhesive and improving the reliability of the connection between the connecting plate and the top cover sheet.
  • 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 view of a specific embodiment of a secondary battery provided by the present application.
  • 4a is a partial view of another embodiment of a secondary battery provided by the present application.
  • 4b is a partial view of still another embodiment of the secondary battery provided by the present application.
  • 4c is a partial view of still another embodiment of the secondary battery provided by the present application.
  • Figure 5 is a cross-sectional view taken along line B-B of Figure 1;
  • FIG. 6 is a schematic structural view of a specific embodiment of a secondary battery flipping sheet provided by the present application.
  • FIG. 7 is still another partial view of a specific embodiment of a secondary battery provided by the present application.
  • FIG. 8 is a schematic structural view of a specific embodiment of a secondary battery conductive sheet provided by the present application.
  • FIG. 9 is still another partial view of a specific embodiment of the secondary battery provided by the present application.
  • an embodiment of the present application provides a secondary battery including a first terminal assembly, a second terminal assembly 30, a top cover sheet 10, an electrode assembly (not shown), and a fixing member 70. And the resistor member 90, 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.
  • One of the first terminal assembly and the second terminal assembly 30 is electrically connected to the top cover sheet 10 through the resistor member 90, and the other is electrically insulated from the top cover sheet 10.
  • the first terminal assembly includes a connecting plate 20 and a flipping plate 40.
  • the connecting plate 20 is fixed to the top cover sheet 10 by a fixing member 70, and the flipping sheet 40 is attached to the connecting plate 20.
  • the first pole piece is electrically connected to the connecting plate 20 through the inverting piece 40
  • the second pole piece is electrically connected to the second terminal block 30; when the pressure in the secondary battery exceeds the reference pressure, the flipping piece 40 can be turned over and off.
  • the electrical connection state of the flip chip 40 and the first pole piece is disconnected, thereby disconnecting the electrical connection state of the connecting plate 20 and the first pole piece.
  • the first pole piece may be a positive electrode piece (the first terminal component is a positive electrode terminal component), and correspondingly the second pole piece is a negative electrode piece (the second terminal component 30 is a negative terminal piece assembly); similarly, the first pole piece may also be The negative electrode tab (the first terminal assembly is a negative terminal assembly) and the second pole tab is a positive electrode tab (the second terminal assembly 30 is a positive terminal assembly).
  • the first pole piece is used as a positive electrode piece (the first terminal unit is a positive electrode terminal), and the second pole piece is a negative electrode piece (the second terminal unit 30 is a negative electrode terminal) as an example.
  • one of the first terminal assembly and the second terminal assembly 30 is electrically connected to the top cover sheet 10 through the resistor 90 through the resistor 90, and the first terminal assembly is tested during the battery nailing test.
  • the external circuit formed with one of the second terminal assemblies 30, the resistor member 90, the top cover sheet 10, the nails, the first pole piece and the second pole piece can reduce the current in the circuit due to the resistor member 90. Further, the heat generation at the nailing is reduced, the occurrence of the ignition is prevented, and the battery core is controlled; and since the fixing member 70 is added, the connecting plate 20 and the top cover sheet 10 are fixedly connected by the fixing member 70, thereby avoiding the adhesive glue.
  • the influence of the instability not only solves the problem of the battery nailing test, but also improves the reliability of the connection between the connecting plate 20 and the top cover sheet 10.
  • attaching the flipping piece 40 to the connecting plate 20 can reduce the first terminal assembly,
  • the overall height of the second terminal assembly 30 and the top cover sheet 10 can leave more accommodation space for the electrode assembly, thereby increasing the energy density of the secondary battery.
  • the resistance value of the resistor 90 is generally selected to be 1 to 100,000 ohms, such as 1 ohm, 50 ohm, 100 ohm, 5000 ohm, 10000 ohm, 80,000 ohm, 100,000 ohm, etc. .
  • the resistance of the resistor 90 can also be selected to be 0.9 ohm, 110000 ohm, etc., depending on the resistance value of the loop.
  • the connecting plate 20 and the second terminal assembly 30 are respectively mounted on the top cover sheet 10.
  • the connecting plate 20 and the second terminal assembly 30 may both protrude from the top cover sheet 10.
  • the connecting board 20 is electrically insulated from the top cover sheet 10
  • the connecting board 20 is located above the top cover sheet 10, that is, the connecting board 20 is located outside the receiving space, and the connecting board 20 and the top cover
  • the first member 21 is disposed between the sheets 10, and the first member 21 is an insulating member; when the second terminal assembly 30 is electrically insulated from the top cover sheet 10, as shown in FIG. 9, the second terminal assembly 30 protrudes from the top cover sheet.
  • the second terminal assembly 30 passes through the third seal 33 and the top cover sheet 10 sealing
  • the third sealing member 33 can be a sealing ring, a sealing pad, etc.
  • the insulation of one end of the insulation and the cover 10 can be achieved by an insulating structure, an insulating glue or an insulating varnish.
  • the insulating structure can be a third member 32 as shown in FIG. 9, in which case the third member 32 is an insulating member, and the second terminal assembly 30 is insulated from the top cover sheet 10 by the third member 32.
  • the secondary battery further includes a conductive block 31, and the conductive block 31 is in electrical contact with the second terminal assembly 30, and the second terminal assembly 30 is electrically connected to the outside through the conductive block 31.
  • the flip-chip 40 and the resistor 90 are both disposed at the same terminal, that is, the first terminal assembly is electrically connected to the top cover 10 through the resistor 90, and the second terminal assembly 30 is electrically insulated from the top cover 10, as shown in FIG. .
  • connection between the connecting plate 20, the fixing member 70 and the top cover sheet 10 can be as follows:
  • the connecting plate 20 is provided with a second through hole 203.
  • the fixing member 70 and the top cover sheet 10 are integrally formed. Generally, the fixing member 70 and the top cover sheet 10 are formed by the same material at one time.
  • the fixing member 70 is inserted into the second through hole 203 and is riveted and fixed to the connecting plate 20, and the fixing member 70 is not in direct contact with the connecting plate 20 (for example, an insulating sleeve or an insulating layer is disposed at a mutual cooperation) to prevent the connecting plate 20 from passing through.
  • the fixing member 70 is directly electrically connected to the top cover sheet 10.
  • the top cover sheet 10 is provided with a third through hole 101.
  • the fixing member 70 and the connecting plate 20 are integrally formed. Generally, the fixing member 70 and the connecting plate 20 are formed by using the same material at one time.
  • the fixing member 70 is inserted into the third through hole 101 and is riveted and fixed to the top cover sheet 10, and the fixing member 70 is not in direct contact with the top cover sheet 10 (for example, an insulating sleeve or an insulating layer is disposed at a mutual fit) to prevent the connecting plate.
  • 20 is electrically conducted directly to the top cover sheet 10 by the fixing member 70.
  • the connecting plate 20 is provided with a second through hole 203, and the top cover piece 10 is provided with a third through hole 101, and the connecting plate 20 passes through the second through hole 203 through the fixing member 70.
  • the three-way hole 101 is fixed to the top cover sheet 10.
  • the two ends of the fixing member 70 are respectively riveted to the connecting plate 20 and the top cover sheet 10, and the fixing member 70 is not in direct contact with the connecting plate 20 (for example, in cooperation with each other).
  • the insulating sleeve or the insulating layer is disposed at the same place or the fixing member 70 is not in direct contact with the top cover sheet 10 (for example, an insulating sleeve or an insulating layer is disposed at a mutual cooperation) to prevent the connecting plate 20 from directly passing through the fixing member 70 and the top cover sheet 10. Electrically conductive.
  • the fixing member 70 When the fixing member 70 is connected to the connecting plate 20 (for example, in the first mode and the third mode), the fixing member 70 is provided with a first stopping portion 702, and the first stopping portion 702 is located at the connecting plate 20 away from the top cover. One side of the sheet 10 is stopped by the connecting plate 20 to ensure the reliability of the attachment of the fixing member 70 to the connecting plate 20.
  • the second through hole 203 is a stepped hole
  • the second through hole 203 includes a first step surface
  • the first step surface faces away from the top cover sheet 10
  • the first stopping portion 702 is adhered to the first step surface to further
  • the reliability of the connection of the fixing member 70 to the connecting plate 20 is increased, and at the same time, the first stopper portion 702 can be at least partially sunk into the second through hole 203, thereby reducing the size of the secondary battery.
  • the fixing member 70 when the fixing member 70 is connected to the top cover sheet 10 (for example, in the second manner and the third manner), the fixing member 70 may also be provided with a second stopping portion 701, and the second stopping portion 701.
  • the top cover sheet 10 is located away from the side of the connecting plate 20 and is stopped by the top cover sheet 10 to ensure the reliability of the attachment of the fixing member 70 to the top cover sheet 10.
  • the third through hole 101 is a stepped hole
  • the third through hole 101 includes a second stepped surface
  • the second stepped surface faces away from the connecting plate 20
  • the second stopping portion 701 is adhered to the second stepped surface to further increase
  • the reliability of the attachment member 70 to the top cover sheet 10 can at the same time at least partially sink the second stopper portion 701 into the third through hole 101, thereby reducing the size of the secondary battery.
  • the first stopping portion 702 and the second stopping portion 701 may be disposed at the same time, or only one of them may be disposed.
  • the second through hole 203 and the third through hole 101 may be correspondingly arranged as stepped holes.
  • the cover sheet 10 and the fixing member 70 are sealed by a sealing structure or a sealant, and when the second stopper 701 is provided.
  • the sealing structure is generally disposed between the second stopping portion 701 and the top cover sheet 10, and the sealing structure may be the first sealing member 80 as shown in FIG. 4c, while the first sealing member 80 and the second sealing member are used.
  • the second sealing member 80 is used for sealing the fixing member 70 and the top cover sheet 10
  • the second sealing member 22 is for sealing the sealing plate 22 and the top cover sheet 10.
  • the top cover sheet 10 is provided with a first through hole; the flip sheet 40 is opposite to the first through hole, between the connecting plate 20 and the top cover sheet 10, or between the flip sheet 40 and the top cover sheet 10, at the first Through hole
  • the outer circumferential seal, optionally, a second seal 22 is disposed between the web 20 and the top cover sheet 10, as shown in Fig. 4c, the second seal member 22 is disposed along the outer circumference of the first through hole.
  • the connecting plate 20 is located on a side of the top cover sheet 10 away from the electrode assembly, and the connecting plate 20 and the top cover sheet 10 are not in direct contact with each other, and the first member 21 is disposed between the connecting plate 20 and the top cover sheet 10, first
  • the member 21 may be an insulating member or a conductive member. Since the resistance value of the metal is too small, when the first member 21 is a conductive member, the material of the first member 21 is generally a non-metal material, such as a conductive plastic.
  • the connecting plate 20 is provided with a recess 202 for providing a space for the flipping of the flipping piece 40 on the side close to the top cover sheet 10. As shown in Figs.
  • the recessed portion 202, the inverting piece 40 and the first through hole are sequentially opposed.
  • the flipping space of the flipping sheet 40 can be provided, so that the connecting panel 20 does not affect the turning of the flipping sheet 40, thereby ensuring the reliability of the flipping of the flipping sheet 40, and further, when the pressure in the secondary battery exceeds the standard pressure, The electrical connection state with the first pole piece can be disconnected in time.
  • the projection of the flip sheet 40 is within the projection of the recess 202.
  • the recessed portion 202 may be recessed from a direction of the connecting plate 20 near the top cover sheet 10 facing away from the top cover sheet 10. In the reverse direction of the flipping sheet 40, the recessed portion 202 may penetrate the connecting plate 20 or may be away from the top cover. The bottom of the sheet 10 is closed. When the bottom of the recessed portion 202 is closed, when the pressure in the secondary battery exceeds the reference pressure to push the flipper 40 to reverse, as the flipper 40 is turned over, the gas in the recessed portion 202 is squeezed and the pressure is increased. The inversion of the inversion piece 40 is prevented, and even the inversion piece 40 is not completely inverted, and the disconnection from the first pole piece cannot be ensured. To solve this problem, the connecting plate 20 is provided with a vent hole 201 along which the vent hole 201 is placed The inversion direction penetrates the connecting plate 20, and the exhaust hole 201 is opposed to the inverting piece 40.
  • the first terminal assembly further includes a conductive sheet 50.
  • the flip sheet 40 In a normal state, the flip sheet 40 is electrically connected to the first pole piece through the conductive sheet 50; when the pressure in the secondary battery exceeds the reference pressure, the flip sheet 40 is turned over. The conductive sheet 50 is disconnected, thereby disconnecting the electrical connection state of the connection plate 20 and the first pole piece.
  • the conductive sheet 50 is inserted into the first through hole to further increase the energy density of the secondary battery.
  • the conductive sheet 50 and the top cover sheet 10 are not in direct contact with each other.
  • a second member 60 is disposed between the conductive sheet 50 and the top cover sheet 10.
  • the second member 60 may be an insulating member or a conductive member. Since the resistance value of the metal is too small, the second member 60 is electrically conductive.
  • the material of the second member 60 is generally a non-metal material, such as a conductive plastic.
  • the specific structure of the conductive sheet 50 includes a first conductive portion 501, a second conductive portion 503, and a thinned region 502.
  • the thinned region 502 is located between the first conductive portion 501 and the second conductive portion 503, and The thickness thereof is smaller than the thickness of the first conductive portion 501 and the thickness of the second conductive portion 503.
  • the first conductive portion 501 is connected to the flip sheet 40; the second conductive portion 503 is connected to the first pole piece, and the connection may be a direct connection or an indirect connection, and the second conductive portion is usually passed through when the conductive sheet 50 is inserted into the first through hole.
  • the portion 503 is inserted into the first through hole.
  • the first conductive portion 501 is connected to the flip sheet 40, and the second conductive portion 503 is connected to the first pole piece.
  • the conductive sheet 50 can be quickly placed in the thinned region 502. The disconnection is performed to quickly realize the electrical connection state of the disconnecting plate 20 and the first pole piece.
  • the conductive sheet 50 is provided with a vent hole penetrating through the conductive sheet 50 in the inverting direction of the flip sheet 40, and the vent hole is opposite to the flip sheet 40.
  • the first vent hole 504 or the second vent hole is disposed.
  • the first vent hole 504 and the second vent hole 505 may also be disposed at the same time. This structure allows the gas in the secondary battery to flow to the inverting piece 40, thereby inverting the inverting piece 40.
  • the conductive sheet 50 is recessed in a cavity close to the electrode assembly to form a cavity, and the first conductive portion 501 and the thinned region 502 are generally disposed at the bottom of the cavity so that the pressure of the conductive sheet 50 in the secondary battery exceeds It is easier to disconnect when the reference pressure is applied.
  • the vent hole is also provided at the bottom of the cavity.
  • the thinned portion 502 may be provided with an indentation and a broken portion, or only one of an indentation and a broken portion may be provided, wherein At the time of opening, when the pressure in the secondary battery exceeds the reference pressure, the inversion piece 40 is reversed to disconnect the first conductive portion 501 from the second conductive portion 503 at the disconnecting portion.
  • the structure of the flipping sheet 40 is as shown in FIG. 6, and includes a reversing portion 401 and a tab 402.
  • the reversing portion 401 has a sheet-like torus structure, and its edge is connected to the connecting plate 20; the tab 402 is connected to the reversing portion 401, usually a protruding head.
  • 402 is connected to the central area of the inverting portion 401 and protrudes in the direction in which the electrode assembly is located, and is connected to the first pole piece.
  • the bump 402 is connected to the first conductive portion 501.
  • the bump 402 is opposite to the first through hole.
  • the connecting plate 20 is electrically connected to the first pole piece through the inverting portion 401 and the protruding head 402.
  • the inverting portion 401 is inverted to make the protruding head 402 and the first pole piece.
  • the electrical connection state is broken; when the first conductive portion 501, the thinned region 502, and the second conductive portion 503 are provided, in a normal state, The connecting plate 20 is electrically connected to the first pole piece through the inverting portion 401, the protruding head 402, the first conductive portion 501, the thinned portion 502, and the second conductive portion 503.
  • the inverting portion The 401 flipping causes the first conductive portion 501 to be disconnected from the second conductive portion 503, thereby disconnecting the electrical connection state of the connection plate 20 from the first pole piece.
  • the distance between the flip chip 40 and the first pole piece can be reduced, and the electrical connection state of the two in the normal state can be ensured.
  • the gas quickly reaches the reversing portion 401 in order to ensure the internal short-circuit gas generation.
  • the second vent hole 405 is opposed to the reversing portion 401.
  • the end surface of the protruding head 402 is also a planar structure to increase the contact area between the flip sheet 40 and the first pole piece or the first conductive portion 501, thereby ensuring a contact area. The reliability of the connection between the two in normal state.
  • the edge of the inverting portion 401 is further provided with a connecting portion 403, the thickness of the connecting portion 403 is larger than the thickness of the inverting portion 401, and the thickness refers to the turning direction of the flipping piece 40.
  • the size of the inverting portion 401 is connected to the connecting plate 20 through the connecting portion 403.
  • the inverting portion 401 may be entirely located in the recessed portion or may be connected to the opening of the recessed portion.
  • the edge of the inverting portion 401 is connected to the inner wall of the recessed portion to improve space utilization.
  • the opening of the recessed portion is provided with a third stepped surface.
  • the connecting portion 403 is attached to the third stepped surface.
  • the inverting portion 401 can also be attached.
  • the third step surface is connected to prevent the connection between the flip chip 40 and the connecting plate 20 from being loosened to cause reliability of electrical connection with the first pole piece.
  • the resistor 90 may be a columnar structure or a sheet structure.
  • the arrangement of the resistors 90 can be as follows:
  • the resistor member 90 is disposed between the top cover sheet 10 and the connecting board 20.
  • the connecting board 20 is not in direct contact with the top cover sheet 10, and the connecting board 20 is electrically connected to the top cover sheet 10 through the resistor member 90 and the top cover sheet 10. connection.
  • the resistor member 90 and the first member 21 may have an integral structure, that is, integrally formed.
  • the resistor member 90 passes through the first member 21, and the two ends thereof are respectively connected to the top cover sheet 10 and the connecting plate 20.
  • the resistor member 90 herein has a columnar structure; , when the first member 21 is a conductive member, the first member 21 and The resistor member 90 is formed of the same material.
  • the first member 21 is a resistor member 90.
  • the integral structure is preferably a sheet-like structure, and the material thereof can be made of conductive plastic, that is, the resistor member 90 is a sheet-like structure, the connecting plate 20 and the resistor member. 90 is laminated with the top cover sheet 10 to increase the reliability of the connection.
  • the first member 21 When the first member 21 is provided, the first member 21 is provided with a fourth through hole, the fourth through hole is opposite to the first through hole, and the projection in the reverse direction of the flipping piece 40, the projection of the flipping piece 40 is located at the The projection of the four through holes prevents the first member 21 from interfering with the inversion of the flipping piece 40.
  • the connecting plate 20 may be provided with a first recess, the one end of the resisting member 90 away from the top cover sheet 10 is inserted into the first recess; the top cover sheet 10 is provided with a second recess, and the resisting member 90 is adjacent to the top cover sheet 10. One end is inserted into the second groove.
  • the conductive sheet 50 When the conductive sheet 50 is provided, the conductive sheet 50 and the top cover sheet 10 are not in contact with each other or insulated therebetween, as shown in FIG. 4-4c, and the second member 60 can be insulated by the second member 60.
  • 60 is an insulating member.
  • the opening of the recessed portion is further provided with a fifth stepped surface, and the fifth stepped surface is closer to the fourth stepped surface.
  • the electrode assembly, and for ease of processing, the projection of the fourth step surface is located within the projection of the fifth step surface in the flip direction of the flip sheet 40.
  • the resistor 90 is disposed between the conductive sheet 50 and the top cover sheet 10, that is, the conductive sheet 50 is electrically connected to the top cover sheet 10 through the resistor 90, and is provided with the second
  • the second conductive portion 503 is electrically connected to the top cover sheet 10 through the resistor 90, that is, the connecting plate 20 sequentially passes through the flip sheet 40 and the conductive sheet 50 (the first conductive portion when the second conductive portion 503 is provided)
  • the 501, the thinned portion 502, the second conductive portion 503), and the resistor 90 are electrically connected to the top cover sheet 10.
  • the connecting plate 20 and the top cover sheet 10 are not directly electrically connected. Therefore, insulation between the connecting plate 20 and the top cover sheet 10 is required, and the first member 21 in the first mode can be passed.
  • One member 21 is an insulating member; it may also be an insulating rubber or an insulating varnish.
  • the resistor member 90 has a columnar structure.
  • the resistor member 90 is disposed between the inner wall of the first through hole and the conductive sheet 50.
  • the resistor member 90 can also be disposed on the top cover sheet. 10 is near the side of the electrode assembly.
  • the second member 60 and the resistor 90 can be The integrated structure, that is, the two are integrally formed.
  • the resistor member 90 passes through the second member 60, and the two ends are respectively connected to the conductive sheet 50 and the top cover sheet 10; when the second member 60 is a conductive member, the second member 60 is The resistor member 90 may be formed of the same material, for example, a conductive plastic, and the second member 60 is the resistor member 90.
  • the conductive sheet 50 (the second conductive portion 503 when the second conductive portion 503 is provided) is provided with a protrusion, and the protrusion is convexly directed to the first
  • the pole piece is raised closer to the first pole piece than the second member 60 in the flipping direction of the flipping piece 40.
  • the conductive sheet 50 is fixed by the second member 60.
  • the conductive sheet 50 and the second member 60 can be fixed by snapping, bonding or screwing, preferably by snapping, to facilitate assembly, as shown in FIG. 4a, wherein the second member 60 and the conductive sheet 50 can be integrally molded by injection molding.
  • the second member 60 is coupled to the top cover sheet 10.
  • the second member 60 and the top cover sheet 10 can be fixed by bonding, snapping, etc., because the second member 60 is usually made of a non-metal material, and the top cover sheet 10 is made of a metal material, in order to facilitate the connection between the two, the second The member 60 can be coupled to the cover sheet 10 by a fastener 70 or a connector 61 as in Figure 4a.
  • the second member 60 is connected to the top cover sheet 10 through the fixing member 70, as shown in FIGS. 4, 4b, 4c.
  • the second member is provided with a fifth through hole 601
  • the fixing member 70 also passes through the fifth through hole 601 and is riveted to the second member 60.
  • the fixing member 70 is provided with the second stopping portion 701
  • the second stopping portion 701 is stopped by the second member 60.
  • the fifth through hole 601 is a stepped hole.
  • the second step surface is provided at the second step. The five through holes 601 and the second stopper portion 701 are in contact with the second step surface.
  • the second member 60 is preferably connected to the top cover sheet 10 through the connecting member 61, as shown in FIG. 4a, specifically, the second member. 60 is provided with a connector fitting portion, the connecting member 61 is matingly coupled with the connector fitting portion, and the second member 60 is fixed to the top cover panel 10 by the connecting member 61, and the fixing manner may be welding, riveting or screwing.
  • the connecting member 61 includes a fixing portion connected to the top cover sheet 10, and a locking portion bent from the fixing portion and extending away from the top cover sheet 10, and the engaging portion is engaged with the connecting portion of the connecting portion to pass through
  • the snap-fit structure realizes the connection of the connecting member 61 and the second member 60 for convenient installation.
  • the second member 60 is also provided with a fifth through hole 601, and the fifth through hole 601 penetrates the second member 60 in the direction in which the top cover sheet 10 is directed to the second member 60. And the fifth through hole 601 is opposite to the connecting member 61.
  • the engaging portion may be provided with one or two. When two are provided, the two engaging portions respectively extend from opposite ends of the fixing portion, and each of the engaging portions respectively engages opposite sides of the engaging portion of the connecting member.
  • the connecting portion of the connecting member 61 and the connecting member may be provided only in one set, or may be provided in multiple groups, such as two groups, three groups or more.
  • the connecting portion 61 and the connecting portion of the connecting member are provided with two groups, with respect to The axis of the first through hole, the two sets of connecting members 61 and the connecting portion of the connecting member are respectively located at two sides of the first through hole.
  • the flip chip 40 and the resistor member 90 are disposed at different terminals, that is, the second terminal assembly is electrically connected to the top cover sheet 10 through the resistor member 90; the first terminal assembly is electrically insulated from the top cover sheet 10.
  • the connecting plate 20 can be electrically insulated from the top cover sheet 10 by the first member 21, and the conductive sheet 50 can be electrically insulated from the top cover sheet 10 by the second member 60. At this time, the first member 21 and the second member 60 are both Insulation.

Abstract

一种二次电池，属于储能器件生产技术领域，第一端子组件和第二端子组件(30)中的一者通过电阻件(90)与顶盖片(10)电连接，另一者与顶盖片(10)电绝缘设置；第一端子组件包括翻转片(40)与连接板(20)，翻转片(40)附接于连接板(20)，连接板(20)通过固定件(70)固定于顶盖片(10)；常态时，第一极片通过翻转片(40)与连接板(20)电连接，第二极片与第二端子组件(30)电连接；当二次电池内的压力超过基准压力时，翻转片(40)能够翻转使导电片(50)断开，从而断开翻转片(40)与第一极片的电连接状态。该二次电池通过固定件(70)使连接板(20)与顶盖片(10)固定连接，从而既解决了穿钉的问题，又保证了连接板(20)与顶盖片(10)连接的可靠性。

Description

二次电池 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。
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，使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，电池进行穿钉试验，即通过金属钉穿入壳体或顶盖片时，造成穿钉处的发热严重，甚至打火，使得电池失去控制而发生着火、爆炸。
现有的电流切断结构中，将翻转片附接于连接板，但是翻转片是直接与顶盖片电连接，带有此种电流切断结构的电池将无法在顶盖片上额外增加电阻件，因此无法通过穿钉试验。
为了避免穿钉过程中电芯内部的电流太大，造成发热严重，甚至打火，在第一端子与顶盖片之间设置一个阻值较大的电阻件，使第一端子通过电阻件与顶盖片电连接，进而在穿钉过程中，减小回路中的电流，防止电芯失去控制。然而，这种结构设计，由于第一端子需通过电阻件与顶盖片电连接，使第一端子与顶盖片不能直接接触，这样，第一端子与顶盖片无法焊接，通常通过胶粘的方式实现固定。而粘接胶受温度等环境因素影响较大，很容易松动，造成第一端子与顶盖片的连接可靠性降低。
发明内容
本申请提供了一种二次电池，能够解决上述问题。
本申请提供了一种二次电池，包括第一端子组件、第二端子组件、顶盖片、电极组件、固定件和电阻件，
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；
所述第一端子组件包括连接板和翻转片，所述翻转片附接于所述连接板；
所述第一端子组件与所述第二端子组件中，一者通过所述电阻件与所述顶盖片电连接；另一者与所述顶盖片电绝缘设置；
所述连接板通过所述固定件固定于所述顶盖片；
常态时，所述第一极片通过所述翻转片与所述连接板电连接，所述第二极片与所述第二端子组件电连接；
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从而断开所述翻转片与所述第一极片的电连接状态。
优选地，所述第一端子组件通过所述电阻件与所述顶盖片电连接，所述第二端子组件与所述顶盖片电绝缘。
优选地，所述连接板设有第二通孔，所述固定件与所述顶盖片为一体结构，所述固定件插入所述第二通孔并与所述连接板铆接固定，且所述固定件与所述连接板不直接接触；
或，
所述顶盖片设有第三通孔，所述固定件与所述连接板为一体结构，所述固定件插入所述第三通孔，并与所述顶盖片铆接固定，且所述固定件与所述顶盖片不直接接触。
优选地，所述连接板设有第二通孔，所述顶盖片设有第三通孔，所述连接板通过所述固定件穿过所述第二通孔、所述第三通孔固定于所述顶盖片，且所述固定件与所述连接板不直接接触和/或所述固定件与所述顶盖片不直接接触。
优选地，所述固定件设有第一止动部，所述第一止动部位于所述连接板远离所述顶盖片的一侧，且止动于所述连接板；
和/或所述固定件设有第二止动部，所述第二止动部位于所述顶盖片远 离所述连接板的一侧，且止动于所述顶盖片。
优选地，所述第二通孔为阶梯孔，所述第二通孔包括第一阶梯面，所述第一止动部与所述第一阶梯面贴合。
优选地，还包括第一密封件，所述第一密封件密封连接于所述第二止动部和所述顶盖片之间。
优选地，所述连接板位于所述顶盖片远离所述电极组件的一侧，所述顶盖片设有第一通孔；所述连接板在靠近所述顶盖片的一面设有为所述翻转片翻转提供空间的凹陷部，所述凹陷部、所述翻转片以及所述第一通孔顺次相对。
优选地，所述第一端子组件还包括导电片，
常态时，所述翻转片通过所述导电片与所述第一极片电连接；当所述二次电池内的压力超过基准压力时，所述翻转片翻转使所述导电片断开，从而断开所述连接板与所述第一极片的电连接状态。
优选地，所述导电片插入所述第一通孔。
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；所述第二导电部插入所述第一通孔，且与所述第一极片连接。
优选地，所述翻转片包括翻转部与凸头，
所述翻转部为片状环面结构，其边缘与所述连接板连接；
所述凸头连接于所述翻转部，且向所述电极组件所在的方向凸出，并和所述第一导电部连接；
常态时，所述连接板依次通过所述翻转部、所述凸头、所述第一导电部、所述减薄区、所述第二导电部与所述第一极片电连接；
当所述二次电池内的压力超过基准压力时，所述翻转部翻转使所述第一导电部与所述第二导电部断开，使所述连接板与所述第一极片的电连接状态断开。
优选地，所述连接板与所述顶盖片之间还设有第一构件，所述第一构 件为绝缘件；所述固定件穿过所述第一构件；所述第二导电部通过所述电阻件与所述顶盖片电连接。
优选地，还包括第二构件，所述导电片通过所述第二构件固定在所述顶盖片；所述电阻件与所述第二构件为一体结构。
优选地，包括第一构件与第二构件，所述第一构件设于所述连接板与所述顶盖片之间，所述导电片通过所述第二构件固定在所述顶盖片，所述固定件依次穿过所述第二构件、所述顶盖片、所述第一构件与所述连接板固定。
优选地，所述第二构件设有用于所述固定件穿过的第五通孔，所述第五通孔为阶梯孔，所述第五通孔包括第二阶梯面，所述第二止动部与所述第二阶梯面贴合。
优选地，所述电阻件设于所述连接板与所述顶盖片之间，所述连接板通过所述电阻件与所述顶盖片电连接。
优选地，还包括第二构件，所述第二构件为绝缘件，所述第二导电部与所述第一通孔之间设有所述第二构件。
优选地，所述连接板与所述顶盖片之间还设有第一构件，所述电阻件和所述第一构件为一体结构，所述连接板、所述电阻件与所述顶盖片层叠设置；所述固定件穿过所述第一构件。
优选地，所述电阻件的阻值为1～100000欧姆。
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，增加固定件，通过固定件将连接板与顶盖片固定连接，从而避免粘接胶不稳定的影响，提高连接板与顶盖片连接的可靠性。
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为沿图1中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视图；
图4a为本申请所提供的二次电池另一种具体实施例的局部视图；
图4b为本申请所提供的二次电池又一种具体实施例的局部视图；
图4c为本申请所提供的二次电池又一种具体实施例的局部视图；
图5为沿图1中B-B线的剖视图；
图6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7为本申请所提供的二次电池一种具体实施例的又一局部视图；
图8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9为本申请所提供的二次电池一种具体实施例的又一局部视图。
附图标记：
10-顶盖片；
101-第三通孔；
20-连接板；
201-排气孔；
202-凹陷部；
203-第二通孔；
21-第一构件；
22-第二密封件；
30-第二端子组件；
31-导电块；
32-第三构件；
33-第三密封件；
40-翻转片；
401-翻转部；
402-凸头；
403-连接部；
50-导电片；
501-第一导电部；
502-减薄区；
503-第二导电部；
504-第一通气孔；
505-第二通气孔；
60-第二构件；
601-第五通孔；
61-连接件；
70-固定件；
701-第二止动部；
702-第一止动部；
80-第一密封件；
90-电阻件。
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，包括第一端子组件、第二端子组件30、顶盖片10、电极组件(图中未示出)、固定件70和电阻件90，二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。第一端子组件与第二端子组件30中，一者与顶盖片10通过电阻件90电连接，另一者与顶盖片10电绝缘。具体地，第一端子组件包括连接板20与翻转片40，连接板20通过固定件70固定于顶盖片10，翻转片40附接于连接板20。常态时，第一极片通过翻转片40与连接板20电连接，第二极片与第二端子组件30电连接；当二次电池内的压力超过基准压力时，翻转片40能够翻转断开 翻转片40与第一极片的电连接状态，从而断开连接板20与第一极片的电连接状态。第一极片可以为正极片(第一端子组件为正极端子组件)，相应地第二极片为负极片(第二端子组件30为负极端子组件)；同样地，第一极片也可以为负极片(第一端子组件为负极端子组件)，而第二极片为正极片(第二端子组件30为正极端子组件)。下面以第一极片为正极片(第一端子组件为正极端子)、第二极片为负极片(第二端子组件30为负极端子)为例进行说明。
上述实施例的二次电池，通过电阻件90，第一端子组件与第二端子组件30中的一者与顶盖片10通过电阻件90电连接，在电池穿钉试验时，第一端子组件与第二端子组件30中的一者、电阻件90、顶盖片10、钉子、第一极片与第二极片形成的外部回路中由于有电阻件90，能够减小回路中的电流，进而降低在穿钉处的发热，防止打火的发生，使电芯得到控制；且由于增加了固定件70，通过固定件70将连接板20与顶盖片10固定连接，从而避免粘接胶不稳定的影响，既解决了电池穿钉试验的问题，又能够提高连接板20与顶盖片10连接的可靠性；同时将翻转片40附接于连接板20，能够降低第一端子组件、第二端子组件30和顶盖片10的整体高度，可以留有更多的容纳空间给电极组件，从而提高二次电池的能量密度。
其中，为了更好地降低穿钉时的回路电流，电阻件90的电阻值一般选为1～100000欧姆，如1欧姆、50欧姆、100欧姆、5000欧姆、10000欧姆、80000欧姆、100000欧姆等。当然，电阻件90的阻值也可以选为0.9欧姆，110000欧姆等，具体根据回路各处的电阻值的需要进行选择。
一般地，连接板20、第二端子组件30分别安装于顶盖片10。为了便于二次电池与外界的电连接，连接板20、第二端子组件30可以均伸出顶盖片10。当第一端子组件与顶盖片10电绝缘时，连接板20与顶盖片10电绝缘，连接板20位于顶盖片10上方，即连接板20位于容纳空间外，连接板20与顶盖片10之间设置第一构件21，此时第一构件21为绝缘件；当第二端子组件30与顶盖片10电绝缘时，如图9中，第二端子组件30伸出顶盖片10，为了保证第二端子组件30与顶盖片10的密封性，通常通过密封件或者密封胶密封，第二端子组件30通过第三密封件33与顶盖片 10密封，第三密封件33可以为密封圈，密封垫等；同理，为了保证连接板20与顶盖片10之间的密封性，也可以通过密封件或者密封胶密封。绝缘的一端与顶盖片10的绝缘可以通过绝缘结构、绝缘胶或者绝缘漆实现，绝缘结构可以为如图9中的第三构件32，此时第三构件32为绝缘件，第二端子组件30通过第三构件32与顶盖片10绝缘。
通常，为了第二端子组件30与外界的电连接更方便，且固定第二端子组件30，二次电池还包括导电块31，导电块31与第二端子组件30接触电连接，第二端子组件30通过导电块31与外界电连接。
第一实施例
翻转片40与电阻件90均设于同一端子，即第一端子组件通过电阻件90与顶盖片10电连接，第二端子组件30与顶盖片10电绝缘，如图3-5所示。
其中，连接板20、固定件70与顶盖片10之间的连接方式可以为以下几种：
第一种方式，如图4a所示，连接板20设有第二通孔203，固定件70与顶盖片10为一体结构，通常固定件70与顶盖片10采用同一种材料一次加工成型，固定件70插入第二通孔203并与连接板20铆接固定，且固定件70与连接板20不直接接触(例如在相互配合的地方设置绝缘套或绝缘层)，以防止连接板20通过固定件70与顶盖片10直接电导通。
第二种方式，如图4b所示，顶盖片10设有第三通孔101，固定件70与连接板20为一体结构，通常固定件70与连接板20采用同一种材料一次加工成型，固定件70插入第三通孔101，并与顶盖片10铆接固定，且固定件70与顶盖片10不直接接触(例如在相互配合的地方设置绝缘套或绝缘层)，以防止连接板20通过固定件70与顶盖片10直接电导通。
第三种方式，如图4所示，连接板20设有第二通孔203，顶盖片10设有第三通孔101，连接板20通过固定件70穿过第二通孔203、第三通孔101固定于顶盖片10，一般地，固定件70的两端分别与连接板20、顶盖片10铆接，且固定件70与连接板20不直接接触(例如在相互配合的 地方设置绝缘套或绝缘层)或者固定件70与顶盖片10不直接接触(例如在相互配合的地方设置绝缘套或绝缘层)，以防止连接板20通过固定件70与顶盖片10直接电导通。
在固定件70与连接板20连接时(例如在第一种方式与第三种方式中)，固定件70设有第一止动部702，第一止动部702位于连接板20远离顶盖片10的一侧，且止动于连接板20，以保证固定件70与连接板20连接的可靠性。可选地，第二通孔203为阶梯孔，第二通孔203包括第一阶梯面，第一阶梯面背离顶盖片10，第一止动部702与第一阶梯面贴合，以进一步增加固定件70与连接板20连接的可靠性，同时能够将第一止动部702至少部分沉入第二通孔203，从而减小二次电池的尺寸。
可以理解地，在固定件70与顶盖片10连接时(例如在第二种方式与第三种方式中)，固定件70也可以设有第二止动部701，第二止动部701位于顶盖片10远离连接板20的一侧，且止动于顶盖片10，以保证固定件70与顶盖片10连接的可靠性。可选地，第三通孔101为阶梯孔，第三通孔101包括第二阶梯面，第二阶梯面背离连接板20，第二止动部701与第二阶梯面贴合，以进一步增加固定件70与顶盖片10连接的可靠性，同时能够将第二止动部701至少部分沉入第三通孔101，从而减小二次电池的尺寸。
上述第一止动部702与第二止动部701可以同时设置，也可以仅设置其中的一者，相应地，第二通孔203与第三通孔101可以对应设置为阶梯孔。
其中，在第二种方式与第三种方式中，为了保证容纳腔的密封性，顶盖片10与固定件70之间通过密封结构或者密封胶密封，在设有第二止动部701时，采用密封结构，通常密封结构设于第二止动部701与顶盖片10之间，密封结构可以为如图4c中的第一密封件80，同时采用第一密封件80与第二密封件22，第一密封件80用于固定件70与顶盖片10的密封，第二密封件22用于连接板22与顶盖片10的密封。
具体地，顶盖片10设有第一通孔；翻转片40与第一通孔相对，连接板20与顶盖片10之间，或者翻转片40与顶盖片10之间，在第一通孔的 外周向密封，可选地，在连接板20与顶盖片10之间设置第二密封件22，如图4c所示，第二密封件22沿第一通孔的外周向设置。
通常，连接板20位于顶盖片10远离电极组件的一侧，连接板20和顶盖片10之间彼此不直接接触，连接板20与顶盖片10之间设置第一构件21，第一构件21可以是绝缘件，也可以是导电件，由于金属的电阻值太小，因此，在第一构件21为导电件时，第一构件21的材质一般为非金属材质，如导电塑胶。连接板20在靠近顶盖片10的一面设有为翻转片40翻转提供空间的凹陷部202，如图3-4所示，凹陷部202、翻转片40以及第一通孔顺次相对。通过增加凹陷部202能够为翻转片40提供翻转空间，使连接板20不会影响翻转片40的翻转，从而保证翻转片40翻转的可靠性，进而在二次电池内的压力超过标准压力时，能够及时断开与第一极片的电连接状态。一般地，在翻转片40的翻转方向上，翻转片40的投影在凹陷部202的投影内。
凹陷部202可以自连接板20靠近顶盖片10的一面向其远离顶盖片10的方向凹陷形成，沿翻转片40的翻转方向，凹陷部202可以贯通连接板20，也可以在远离顶盖片10的底部封闭。在凹陷部202的底部封闭时，由于当二次电池内的压力超过基准压力推动翻转片40翻转时，随着翻转片40的翻转，凹陷部202内的气体被挤压，压力增大，会阻止翻转片40的翻转，甚至使翻转片40翻转不彻底，无法保证与第一极片的断开，为了解决此问题，连接板20设有排气孔201，排气孔201沿翻转片的翻转方向贯通连接板20，且排气孔201与翻转片40相对。
为了连接的方便性，第一端子组件还包括导电片50，常态时，翻转片40通过导电片50与第一极片电连接；当二次电池内的压力超过基准压力时，翻转片40翻转使导电片50断开，从而断开连接板20与第一极片的电连接状态。
具体地，如图4所示，导电片50插入第一通孔，以进一步提高二次电池的能量密度。导电片50和顶盖片10之间彼此不直接接触，可选地，导电片50和顶盖片10之间设置第二构件60，第二构件60可以是绝缘件，也可以是导电件。由于金属的电阻值太小，因此，在第二构件60为导电 件时，第二构件60的材质一般为非金属材质，如导电塑胶。
导电片50的具体结构如图8所示，包括第一导电部501、第二导电部503和减薄区502，减薄区502位于第一导电部501与第二导电部503之间，且其厚度小于第一导电部501的厚度与第二导电部503的厚度。第一导电部501与翻转片40连接；第二导电部503与第一极片连接，连接可以是直接连接，也可以是间接连接，在导电片50插入第一通孔时通常通过第二导电部503插入第一通孔。通过设置减薄区502，同时将第一导电部501与翻转片40连接，第二导电部503与第一极片连接，在翻转片40翻转时，能够快速将导电片50在减薄区502处拉断，从而快速实现断开连接板20与第一极片的电连接状态。
通常，导电片50设有通气孔，通气孔在翻转片40的翻转方向上贯通导电片50，通气孔与翻转片40相对，如图8所示，设置第一通气孔504或者第二通气孔505，也可以同时设置第一通气孔504和第二通气孔505。该结构使二次电池内的气体能够流通到翻转片40，进而使翻转片40翻转。
进一步地，导电片50在靠近电极组件的一面向内凹陷形成空腔，第一导电部501、减薄区502通常设于空腔的底部，以使导电片50在二次电池内的压力超过基准压力时更易断开。此时，通气孔也设于空腔的底部。
为了在较小的拉力下能够将导电片50拉断，减薄区502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，当二次电池内的压力超过基准压力时，翻转片40翻转使第一导电部501与第二导电部503在断开部断开。
翻转片40的结构如图6所示，包括翻转部401与凸头402，翻转部401为片状环面结构，其边缘与连接板20连接；凸头402连接于翻转部401，通常凸头402连接于翻转部401的中心区域，且向电极组件所在的方向凸出，并与第一极片连接。在设有第一导电部501时，凸头402与第一导电部501连接，一般地，凸头402和第一通孔相对。以在常态时，连接板20通过翻转部401、凸头402与第一极片电连接，当二次电池内的压力超过基准压力时，翻转部401翻转使凸头402与第一极片的电连接状态断开；在设有第一导电部501、减薄区502和第二导电部503时，常态时， 连接板20通过翻转部401、凸头402、第一导电部501、减薄区502、第二导电部503与第一极片电连接，当二次电池内的压力超过基准压力时，翻转部401翻转使第一导电部501与第二导电部503断开，从而使连接板20与第一极片的电连接状态断开。上述结构，通过增加凸头402，能够减小翻转片40与第一极片的距离，保证二者在常态时的电连接状态。
其中，在导电片50设有通气孔时，为了保证内短路产气时，气体快速地抵达翻转部401，可选地，第二通气孔405与翻转部401相对。
由于第一极片或者第一导电部501为平面结构，因此，相应地凸头402的端面也为平面结构，以增加翻转片40与第一极片或者第一导电部501的接触面积，保证常态时二者连接的可靠性。
进一步地，为了保证翻转片40与连接板20连接的可靠性，翻转部401的边缘还设有连接部403，连接部403的厚度大于翻转部401的厚度，厚度指沿翻转片40的翻转方向的尺寸，翻转部401通过连接部403连接于连接板20。
在设有凹陷部时，翻转部401可以整个位于凹陷部内，也可以连接于凹陷部的开口处，优选翻转部401的边缘连接于凹陷部的内壁，以提高空间利用率。可选地，凹陷部的开口处设有第三阶梯面，如图4所示，连接部403贴合连接于第三阶梯面，在仅设有翻转部401时，也可以翻转部401贴合连接于第三阶梯面，以防止常态时，翻转片40与连接板20的连接松动造成与第一极片电连接的可靠性。
上述实施例中电阻件90可以为柱状结构，也可以为片状结构。具体地，电阻件90的设置方式可以有如下几种：
第一种方式，电阻件90设于顶盖片10与连接板20之间，此时，连接板20与顶盖片10不直接接触，连接板20是通过电阻件90与顶盖片10电连接。
其中，在设有第一构件21时，电阻件90与第一构件21可以为一体结构，即一体加工成型。在第一构件21为绝缘件时，电阻件90穿过第一构件21，其两端分别与顶盖片10与连接板20连接，一般地，此处的电阻件90为柱状结构；可选地，在第一构件21为导电件时，第一构件21与 电阻件90采用相同材料形成，此时第一构件21即为电阻件90，一体结构优选采用片状结构，其材质可选用导电塑胶，即电阻件90为片状结构，连接板20、电阻件90与顶盖片10层叠设置，以增加连接的可靠性。
在设有第一构件21时，第一构件21设有第四通孔，第四通孔与第一通孔相对，且在翻转片40的翻转方向上的投影，翻转片40的投影位于第四通孔的投影内，以防止第一构件21对翻转片40的翻转发生干涉。
进一步地，连接板20可以设有第一凹槽，电阻件90远离顶盖片10的一端插入第一凹槽；顶盖片10设有第二凹槽，电阻件90靠近顶盖片10的一端插入第二凹槽。通过设置第一凹槽与第二凹槽的结构，能够防止电阻件90与顶盖片10、连接板20之间发生位移，提高三者电连接的可靠性。也可以仅连接板20设有第一凹槽，或者仅顶盖片10设有第二凹槽。
在设有导电片50时，导电片50与顶盖片10之间不接触，或者二者之间绝缘，如图4-4c所示，可以通过设置第二构件60绝缘，此时第二构件60为绝缘件。
其中，在设有凹陷部及第四阶梯面时，为了防止第一构件21与翻转片40的干涉，凹陷部的开口处还设有第五阶梯面，第五阶梯面较第四阶梯面靠近电极组件，且为了方便加工，在翻转片40的翻转方向上，第四阶梯面的投影位于第五梯面的投影内。
第二种方式，在设有导电片50时，电阻件90设于导电片50与顶盖片10之间，即导电片50通过电阻件90与顶盖片10电连接，在设有第二导电部503时，第二导电部503通过电阻件90与顶盖片10电连接，即连接板20依次通过翻转片40、导电片50(在设有第二导电部503时为第一导电部501、减薄区502、第二导电部503)、电阻件90与顶盖片10电连接。在该种方式中，连接板20与顶盖片10不直接导通，因此，连接板20与顶盖片10之间需要绝缘，可以通过第一种方式中的第一构件21，此时第一构件21为绝缘件；也可以为绝缘胶或者绝缘漆。
可选地，电阻件90为柱状结构，在导电片50插入第一通孔时，电阻件90设置于第一通孔的内壁与导电片50之间；电阻件90也可以设置于顶盖片10靠近电极组件的一侧。其中，第二构件60与电阻件90可以为 一体结构，即二者一体加工成型。在第二构件60为绝缘件时，电阻件90穿过第二构件60，且两端分别与导电片50、顶盖片10连接；在第二构件60为导电件时，第二构件60与电阻件90可以为采用同一种材料形成，例如采用导电塑胶形成，此时第二构件60即为电阻件90。
为了更好地保证常态时导电片50与第一极片的电连接，导电片50(在设有第二导电部503时为第二导电部503)设有凸起，凸起凸向第一极片，且在翻转片40的翻转方向上凸起较第二构件60距离第一极片近。
不论电阻件90采用哪种方式设置，在第二构件60为绝缘件时，若导电片50松动，在第一通孔内滑动，会造成翻转片40翻转后无法断开连接板20与第一极片的电连接状态，为了更好地固定导电片50，导电片50通过第二构件60固定。导电片50与第二构件60可以通过卡接、粘接或者螺钉连接实现固定，优选卡接，方便装配，如图4a所示，其中，第二构件60与导电片50可以通过注塑一体成型，第二构件60连接于顶盖片10。
第二构件60与顶盖片10的固定方式可以为粘接、卡接等，由于第二构件60为通常为非金属材质，顶盖片10为金属材质，为了方便二者的连接，第二构件60可以通过固定件70或者如图4a中的连接件61与顶盖片10连接。
通常，在连接板20、顶盖片10与固定件70采用第二种方式与第三种方式连接时，第二构件60通过固定件70与顶盖片10连接，如图4、4b、4c所示，此时，第二构件设有第五通孔601，固定件70还穿过第五通孔601，并与第二构件60铆接。在固定件70设有第二止动部701时，第二止动部701止动于第二构件60，相应地，第五通孔601为阶梯孔，此时，第二阶梯面设于第五通孔601，第二止动部701与第二阶梯面贴合。
在固定件70与顶盖片10、连接板20采用第二种方式连接时，第二构件60优选采用通过连接件61与顶盖片10连接，如图4a所示，具体地，第二构件60设有连接件配合部，连接件61与连接件配合部配合连接，第二构件60通过连接件61固定在顶盖片10，固定方式可以为焊接、铆接或者螺钉连接。
可选地，连接件61包括连接于顶盖片10的固定部，和自固定部弯折且向远离顶盖片10的方向延伸的卡接部，卡接部卡入连接件配合部，通过卡接结构实现连接件61与第二构件60的连接，方便安装。
为了方便连接件61与顶盖片10的固定操作，第二构件60也设有第五通孔601，第五通孔601沿顶盖片10指向第二构件60的方向贯通第二构件60，且第五通孔601与连接件61相对。
卡接部可以设有一个或者两个，设有两个时，两个卡接部分别自固定部相对的两端延伸，各卡接部分别卡入连接件配合部相对的两侧。
连接件61与连接件配合部可以仅设有一组，也可以设有多组，如两组，三组或者更多组，一般地，连接件61与连接件配合部设有两组，相对于第一通孔的轴线，两组连接件61与连接件配合部分别位于第一通孔的两侧。
第二实施例
翻转片40与电阻件90设于不同端子，即第二端子组件通过电阻件90与顶盖片10电连接；第一端子组件与顶盖片10电绝缘。其中，连接板20可以通过第一构件21与顶盖片10电绝缘，导电片50可以通过第二构件60与顶盖片10电绝缘，此时的第一构件21、第二构件60均为绝缘件。
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 (20)

  1. 一种二次电池，其特征在于，包括第一端子组件、第二端子组件、顶盖片、电极组件、固定件和电阻件，
    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；
    所述第一端子组件包括连接板和翻转片，所述翻转片附接于所述连接板；
    所述第一端子组件与所述第二端子组件中，一者通过所述电阻件与所述顶盖片电连接；另一者与所述顶盖片电绝缘设置；
    所述连接板通过所述固定件固定于所述顶盖片；
    常态时，所述第一极片通过所述翻转片与所述连接板电连接，所述第二极片与所述第二端子组件电连接；
    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从而断开所述翻转片与所述第一极片的电连接状态。
  2. 根据权利要求1所述的二次电池，其特征在于，所述第一端子组件通过所述电阻件与所述顶盖片电连接，所述第二端子组件与所述顶盖片电绝缘。
  3. 根据权利要求2所述的二次电池，其特征在于，所述连接板设有第二通孔，所述固定件与所述顶盖片为一体结构，所述固定件插入所述第二通孔并与所述连接板铆接固定，且所述固定件与所述连接板不直接接触；
    或，
    所述顶盖片设有第三通孔，所述固定件与所述连接板为一体结构，所述固定件插入所述第三通孔并与所述顶盖片铆接固定，且所述固定件与所述顶盖片不直接接触。
  4. 根据权利要求2所述的二次电池，其特征在于，所述连接板设有第二通孔，所述顶盖片设有第三通孔，所述连接板通过所述固定件穿过所述第二通孔、所述第三通孔固定于所述顶盖片，且所述固定件与所述连接 板不直接接触和/或所述固定件与所述顶盖片不直接接触。
  5. 根据权利要求4所述的二次电池，其特征在于，所述固定件设有第一止动部，所述第一止动部位于所述连接板远离所述顶盖片的一侧，且止动于所述连接板；
    和/或所述固定件设有第二止动部，所述第二止动部位于所述顶盖片远离所述连接板的一侧，且止动于所述顶盖片。
  6. 根据权利要求5所述的二次电池，其特征在于，所述第二通孔为阶梯孔，所述第二通孔包括第一阶梯面，所述第一止动部与所述第一阶梯面贴合。
  7. 根据权利要求5所述的二次电池，其特征在于，还包括第一密封件，所述第一密封件密封连接于所述第二止动部和所述顶盖片之间。
  8. 根据权利要求3-7任一项所述的二次电池，其特征在于，所述连接板位于所述顶盖片远离所述电极组件的一侧，所述顶盖片设有第一通孔；所述连接板在靠近所述顶盖片的一面设有为所述翻转片翻转提供空间的凹陷部，所述凹陷部、所述翻转片以及所述第一通孔顺次相对。
  9. 根据权利要求8所述的二次电池，其特征在于，所述第一端子组件还包括导电片，
    常态时，所述翻转片通过所述导电片与所述第一极片电连接；当所述二次电池内的压力超过基准压力时，所述翻转片翻转使所述导电片断开，从而断开所述连接板与所述第一极片的电连接状态。
  10. 根据权利要求9所述的二次电池，其特征在于，所述导电片插入所述第一通孔。
  11. 根据权利要求9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；所述第二导电部插入所述第一通孔，且与所述第一极片连接。
  12. 根据权利要求11所述的二次电池，其特征在于，所述翻转片包 括翻转部与凸头，
    所述翻转部为片状环面结构，其边缘与所述连接板连接；
    所述凸头连接于所述翻转部，且向所述电极组件所在的方向凸出，并和所述第一导电部连接；
    常态时，所述连接板依次通过所述翻转部、所述凸头、所述第一导电部、所述减薄区、所述第二导电部与所述第一极片电连接；
    当所述二次电池内的压力超过基准压力时，所述翻转部翻转使所述第一导电部与所述第二导电部断开，使所述连接板与所述第一极片的电连接状态断开。
  13. 根据权利要求11或12所述的二次电池，其特征在于，所述连接板与所述顶盖片之间还设有第一构件，所述第一构件为绝缘件；所述固定件穿过所述第一构件；所述第二导电部通过所述电阻件与所述顶盖片电连接。
  14. 根据权利要求13所述的二次电池，其特征在于，还包括第二构件，所述导电片通过所述第二构件固定在所述顶盖片；所述电阻件与所述第二构件为一体结构。
  15. 根据权利要求11所述的二次电池，其特征在于，还包括第一构件和第二构件，所述第一构件设于所述连接板与所述顶盖片之间，所述导电片通过所述第二构件固定在所述顶盖片，所述固定件依次穿过所述第二构件、所述顶盖片、所述第一构件与所述连接板固定。
  16. 根据权利要求15所述的二次电池，其特征在于，所述第二构件设有用于所述固定件穿过的第五通孔，所述第五通孔为阶梯孔，所述第五通孔包括第二阶梯面，所述第二止动部与所述第二阶梯面贴合。
  17. 根据权利要求11所述的二次电池，其特征在于，所述电阻件设于所述连接板与所述顶盖片之间，所述连接板通过所述电阻件与所述顶盖片电连接。
  18. 根据权利要求17所述的二次电池，其特征在于，还包括第二构件，所述第二构件为绝缘件，所述第二导电部与所述第一通孔之间设有所述第二构件。
  19. 根据权利要求17所述的二次电池，其特征在于，所述连接板与所述顶盖片之间还设有第一构件，所述电阻件和所述第一构件为一体结构，所述连接板、所述电阻件与所述顶盖片层叠设置；所述固定件穿过所述第一构件。
  20. 根据权利要求1所述的二次电池，其特征在于，所述电阻件的电阻值为1～100000欧姆。
PCT/CN2016/109288 2016-12-09 2016-12-09 二次电池 WO2018103094A1 (zh)

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