WO2019120238A1 - 电池盖板组件、单体电池、电池模组、动力电池及电动汽车 - Google Patents

电池盖板组件、单体电池、电池模组、动力电池及电动汽车 Download PDF

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Publication number
WO2019120238A1
WO2019120238A1 PCT/CN2018/122249 CN2018122249W WO2019120238A1 WO 2019120238 A1 WO2019120238 A1 WO 2019120238A1 CN 2018122249 W CN2018122249 W CN 2018122249W WO 2019120238 A1 WO2019120238 A1 WO 2019120238A1
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WO
WIPO (PCT)
Prior art keywords
battery
score
weld zone
cover assembly
land
Prior art date
Application number
PCT/CN2018/122249
Other languages
English (en)
French (fr)
Inventor
蒋露霞
Original Assignee
比亚迪股份有限公司
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Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2019120238A1 publication Critical patent/WO2019120238A1/zh

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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the field of batteries, and relates to a battery cover assembly, a battery using the battery cover assembly, a battery module using the battery, a power battery using the battery module, and a vehicle using the battery .
  • the battery pack of the power battery may have a battery module composed of a plurality of single cells connected in series or in parallel.
  • the BMS Battery Management System
  • the state of charge is calculated. If there is a problem with the voltage sampling, it may cause the battery to overcharge.
  • the overcharge reaches a certain level, there is a danger of the battery burning and exploding.
  • the voltage and current of the battery are first monitored, and the battery power is calculated by the current integration method and the open circuit voltage method, thereby controlling the charge and discharge of the battery.
  • the battery power is calculated by the current integration method and the open circuit voltage method, thereby controlling the charge and discharge of the battery.
  • deficiencies such as battery voltage sampling or current sampling failure, or software failure, resulting in the battery not being controlled for a long time, especially in the case of charging with a charging post, when the charging pile fails to communicate with the battery manager, Charge can not be controlled, the battery overcharge to a certain extent, will cause the battery to rise or even explode.
  • An object of the present disclosure is to provide a battery cover assembly, a battery using the battery cover assembly, a battery module using the battery, a power battery using the battery module, and a power battery Vehicles.
  • the present disclosure also proposes a single battery having the above battery cover assembly.
  • the present disclosure also proposes a battery module having the above single battery.
  • the present disclosure also proposes a power battery having the above battery module.
  • the present disclosure also proposes an electric vehicle having the above power battery.
  • a battery cover assembly includes a cover plate, an inner lead-out member located inside the cover plate, and an electrode outer terminal located outside the cover plate, the inner lead-out member and the outer electrode terminal being interrupted by a current Electrically connecting the device, the current interrupting device comprising a score member and a flip member, the score member comprising a scored region formed with a score, a first land for electrical connection with the flip member, and for a second weld zone electrically connected to the inner lead-out member, the flip member being capable of acting under the action of air pressure to break the score, the vertical cross section of the score member perpendicular to the length of the cover plate Upper, the first weld zone, the score zone and the second weld zone are arranged in a strip shape, and the score extends along the length direction of the cover plate on the score zone, the first welding The thickness of the zone and the second weld zone is greater than or equal to the thickness of the score zone.
  • the electrical connection between the first land and the second land can also be broken by breaking the score, thereby interrupting the current.
  • the arrangement in the vertical direction is strip-shaped, that is, the dimension of the score member in the height direction is larger than the dimension in the width direction, so that the dimension of the score member in the width direction can be effectively saved, which is beneficial to the overall current interruption.
  • the device does not extend beyond the width of the cover in the width direction.
  • the thickness of the first weld zone 103 and the second weld zone 107 is not less than the thickness of the score zone to ensure the weld strength of the weld zone and to provide a basis for high quality scoring.
  • the first weld zone and the second weld zone have a thickness of 0.4-5 mm, and the score zone has a thickness of 0.05-1 mm.
  • the first weld zone and the second weld zone have a thickness of 0.8-3 mm, and the score zone has a thickness of 0.1-0.8 mm.
  • the scored region is formed as an elongated structure extending along a length direction of the cover plate, the score extending along a length direction of the elongated structure, and the first welding a region and the second land are disposed on both sides of the height direction of the score region,
  • the scores are parallel to the first weld zone and the second weld zone, respectively.
  • the end of the score penetrates to or is spaced from the edge of the scored area.
  • the first land, the scored area, and the second land are sequentially formed in an I-shaped structure in the height direction.
  • the score is one formed on one side of the scored area, or two formed on both sides of the scored area.
  • the inverting member is formed as an elongated structure extending along a length direction of the cover plate, and has a first connection region extending along the first land and soldered to each other, the first connection The region is formed into an elongated structure and the lower surface is formed with a solder bath that accommodates the first land.
  • the solder bath is an n-type groove to be welded to both side edges of the first land.
  • the electrode outer terminal is electrically connected to the flip member
  • the score member is electrically connected to the inner lead member
  • the flip member has a second connection formed into an elongated structure a support ring is sealingly connected between the lower side of the second connection area and the cover plate, and an outer circumference of the electrode outer terminal is electrically connected to an upper side of the second connection area.
  • the support ring is an elongate structure that extends along the length of the cover plate and does not extend beyond the width edge of the cover.
  • the inner lead-out member is formed as a sheet-like structure having an intermediate weld zone electrically connected to the score member and an edge weld zone electrically connected to the battery core, the edge The weld zone is located outside of the intermediate weld zone.
  • the thickness of the edge land is greater than or equal to the thickness of the intermediate land.
  • the intermediate weld zone has a thickness of 0.1 to 1 mm and the edge weld zone has a thickness of 1 to 5 mm.
  • the edge weld zone is formed as an annular joint zone surrounding the intermediate weld zone or a strip weld zone on either side of the intermediate weld zone.
  • the intermediate weld zone and the edge weld zone are integrally formed or joined separately.
  • a unit cell according to a second aspect of the present disclosure comprising a casing, a battery core housed in the casing, and a battery cover assembly enclosing the casing, wherein the battery cover assembly is a battery cover provided by the present disclosure
  • a plate assembly electrically coupled to the battery core and the inverting member is in gaseous communication with an interior of the outer casing.
  • the battery unit provided by the present disclosure is provided in the battery module.
  • a power battery according to a fourth aspect of the present disclosure includes a package body and a battery module disposed in the package body, the battery module being the battery module provided by the present disclosure.
  • the electric vehicle is provided with the power battery provided by the present disclosure.
  • FIG. 1 is a partially exploded perspective view of a battery module of the present disclosure
  • FIG. 2 is a partial perspective structural view of a flip member of a current interrupting device in an embodiment of the present disclosure
  • FIG. 3 is a top plan view of a flip member of a current interrupting device of an embodiment of the present disclosure
  • FIG. 4 is a schematic perspective structural view of a unit battery of a battery cover assembly of an embodiment of the present disclosure
  • FIG. 5 is a perspective view showing a first structure of a scoring member of a current interrupting device in an embodiment of the present disclosure
  • FIG. 6 is a perspective view showing a second structure of a scoring member of a current interrupting device in an embodiment of the present disclosure
  • FIG. 7 is a perspective view showing a third structure of a scoring member of a current interrupting device in an embodiment of the present disclosure
  • Figure 8 is a cross-sectional view of a battery cover assembly based on the score member of Figure 5 in an embodiment of the present disclosure
  • FIG. 9 is a cross-sectional view of a battery cover assembly based on the score member of FIG. 7 in an embodiment of the present disclosure
  • FIG. 10 is a partial structural schematic view of an inner lead-out member in an embodiment of the present disclosure.
  • FIG. 11 is a partial structural schematic view of another inner lead-out member in an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural view of an electric vehicle according to the present disclosure.
  • orientation words used such as “up, down, left, and right,” are generally defined on the basis of the direction of the drawing of the corresponding drawing, and "inside and outside” means Inside and outside of the contour of the corresponding part.
  • the present disclosure provides a current interrupting device, a scoring member, a flip member, a battery cover assembly 100 using the current interrupting device, and a single battery using the battery cover assembly 100 200.
  • the battery module 300 using the unit battery 200, the power battery 400 of the battery module 300, and the electric vehicle 500 using the power battery 400 are used.
  • a current interrupting device is disposed between the electrode outer terminal 112 and the internal cell for cutting off the circuit inside and outside the battery.
  • the plurality of unit cells 200 constitute the battery module 300 in series or in parallel, and can be placed in the battery pack to form the power battery 400.
  • various technical solutions provided in the present disclosure can be widely applied to other battery fields.
  • the present disclosure introduces the current interrupting device involved by two embodiments. The various embodiments will be described in detail below with reference to the drawings.
  • an embodiment of the present disclosure provides a battery module 300 including a plurality of unit batteries 200 , wherein the unit battery 200 may include a housing 111 and electricity contained in the housing.
  • the battery cover assembly 100 further has an inner lead-out member 109 electrically connected to the battery core, and a current interrupting device is disposed between the outer electrode terminal 112 and the inner lead-out member 109 to control the current of the electrode terminal. Input and output.
  • the current interrupting device is in a state in which the battery cell is turned on in the normal state of the unit cell 200.
  • the electrode terminal can normally perform current input and output to complete the charging and discharging operation of the unit cell 200, and in a dangerous state.
  • the current interruption device can interrupt the current input and current output of the electrode terminal, thereby avoiding problems such as overcharging of the battery. Therefore, as an important safety measure, the reliability of the current interrupt device is critical, that is, the current interrupt device is required to respond quickly.
  • the current interrupting device in each embodiment is a mechanical structure that induces air pressure, and the current interrupting device is in gas communication with the inside of the outer casing of the unit cell 200 and is capable of acting to interrupt the flow of current under air pressure.
  • the transfer of current can be interrupted by disconnecting the internal components to cut off the charge and discharge of the battery in time.
  • the source of the air pressure used is: when the battery is in a dangerous state such as overcharging, gas is generated inside the battery, which causes the air pressure inside the outer casing to rise, or the battery is heated when the battery is abnormal during use. The internal air pressure rises, thereby generating the pneumatic power that drives the current interruption device.
  • the current interrupting device has a scoring member 101 and a flip member 102 connected to the scoring member 101 to be electrically connected to each other, and the flip member 102 and the scoring member 101 can Disconnect the electrical connection under pressure.
  • the disconnection of the self structure may be achieved by disconnecting at least one of the two, for example, by processing a weak score on the corresponding component, thereby achieving disconnection of the electrical connection, some
  • a score 104 is formed on the score member 101.
  • the indentation 104 can be broken by the inversion operation of the inverting member 102 to achieve the disconnection of the electrical connection between the electrode outer terminal 112 and the inner lead-out member 109, thereby achieving the purpose of cutting off the current.
  • the complete disconnection of the score member 101 and the flip member 102 can be accomplished by the provision of the score 104 of the score member 101, i.e., the weak portion having a lower strength than the other regions is formed in the corresponding portion.
  • the inverting member 102 is formed into a tapered sheet-like structure, and the tapered small end is formed as a first connecting portion 115, and the big end is away from the notch.
  • the piece 101 is formed as a second connection zone 116.
  • the tapered structure can dispose the first connecting area 115 and the second connecting area 116 differently, and can provide a space for the flipping member 102 to be turned upside down to break the nick 104, thereby breaking the electrode outer terminal 112 and the inner portion. Electrical connections between the leads 109.
  • the flip member 102 may also be a flat member having elasticity or the like.
  • a support ring 113 is sealedly connected between the lower side of the outer periphery of the flip member 102 and the cover 110, and the electrode is externally
  • the outer periphery of the terminal 112 is electrically connected to the upper side of the outer periphery of the flip member 102, so that gas generated from the inside of the battery can act on the flip member 102 without leaking.
  • the electrode outer terminal 112 is formed into a cap structure and may be formed with a through hole for discharging gas when the flipper 102 is actuated, thereby preventing the flipper from being impeded under the action of air pressure.
  • the support ring 113 may be supported by an insulating material or a conductive material.
  • the support ring 113 can be a ceramic ring to insulate the cover plate 110 from being charged.
  • the battery cover assembly 100 provided by the embodiment of the present disclosure includes a flip member 102 formed on the basis of the foregoing embodiment to extend along the length direction of the cover plate 110.
  • Shape structure herein means that the dimension in the longitudinal direction of the cover plate is larger than the dimension in the other direction in the section parallel to the cover plate of the elongated structure. Therefore, as shown in FIG. 4, since the inverting member 102 is formed as an elongated structure extending in the longitudinal direction of the cover plate, it is possible to reduce, for example, the inverting member 102 in FIG. 1 while ensuring the contact area with the internal gas.
  • the current interrupting device exposes the portion of the cover plate 110 beyond the cover plate 110 in the height direction, and even as shown in FIG. 9, can be completely within the range of the cover plate, thereby avoiding interference with other devices other than the cover plate 110. At the same time, the flip sensitivity is guaranteed.
  • the end portion of the elongated structure in the longitudinal direction has a circular arc shape, that is, the cross section parallel to the cover plate has a middle rectangle and curved ends at both ends.
  • the structure i.e., the structure, has no corners, thereby facilitating the formation of the annular flip member and other corresponding structures, such as the score member 101, the support ring 113 and the electrode outer terminal 112, which are fitted thereto, while accommodating the structure of the cover plate 110.
  • the elongate structure may also be a waist or elliptical structure with the long axis of the waist or elliptical cross section being in the direction of the cover.
  • the parallel of the elongate structure and the cross section of the cover plate may also be formed into other shapes such as a rectangular cross section.
  • the components connected to the flip member 102 outside the cover plate 110 are the electrode outer terminal 112 and the support ring 113, it is possible to design an elongated structure which is also matched, so that, for the component
  • the connection between the at least the flip member 102 and the second connection region 116 connected to the electrode outer terminal 112 and the support ring 113 is formed into an elongated structure.
  • the support ring 113 is connected to the cover plate 110, and can be designed to form an elongated structure that does not protrude from the edge of the cover plate 110, specifically the width edge of the cover plate 110, wherein the width edge and cover of the support ring 113 can be selected.
  • the edges of the board 110 are aligned. In order to obtain a larger design and force space for the flip member 102.
  • the first connection region 115 is also formed to have an elongated structure extending in the longitudinal direction of the cover plate.
  • the end of the elongated structure in the longitudinal direction is a circular arc shape, and the elongated structure may also be an elliptical or a waisted structure.
  • the corresponding score member 101 can be formed into an elongated structure as shown in FIGS. 5 to 7.
  • the inverting member 102 is formed into a tapered sheet-like structure in a direction perpendicular to the upper surface of the cap plate 110, and the first connecting portion 115 formed by the tapered small end is formed into an elongated shape.
  • the structure has a large end away from the score member 101 and forms a second connection region 116 which is parallel to the first connection region 115 and formed into an elongated structure.
  • the second connection region 116 is a flanged structure to facilitate simultaneous connection with the support ring 113 and the electrode outer terminal 112.
  • the thicknesses of the first connection region 115 and the second connection region 116 are respectively greater than the thickness of the action region 123 between the two.
  • the first connection region and the second connection region may have a thickness of 0.3-3 mm, and the action region 123 may have a thickness of 0.05-0.3 mm. This design is equally applicable to the flipper 102 in other embodiments.
  • the scoring 104 is an elongated scoring that is not closed loop.
  • the first land 103, the scored region 105, and the second land 107 are sequentially disposed in a strip shape, and the score 104 is The scored area 105 extends along the length direction of the cover plate 110.
  • the arrangement in the vertical direction is strip-shaped, that is, the dimension of the score member in the height direction is larger than the dimension in the width direction, so that the dimension of the score member 101 in the width direction can be effectively saved, which is beneficial to the overall current.
  • the interrupting device does not extend beyond the extent of the cover plate 110 in the width direction.
  • the score region 105 is formed in an elongated structure extending in the longitudinal direction of the cover plate, that is, the dimension in the longitudinal direction of the score member is larger than the dimension in the width direction and the height direction.
  • the score 104 extends along the length of the elongate structure to form a non-closed loop score.
  • the score 104 is a linear score, and in other possible embodiments, the score It can also be a long indentation such as a curve or a broken line.
  • the first land 103 and the second land 107 are disposed on both sides in the height direction of the notch region 105.
  • the first land 103, the scored region 105, and the second land 107 are disposed in order from the top to the bottom in the height direction, thereby being lined up in the vertical section of the score member 101 perpendicular to the cover plate 110.
  • Sexual distribution Thus, it is different from the existing radial inscribed circular indentations.
  • the score 104 can also be broken, thereby achieving the purpose of interrupting the current between the electrode outer terminal 112 and the inner lead member 109.
  • the first land 103, the scored region 105, and the second land 107 are sequentially formed in an I-shaped structure in the height direction, that is, the first land 103. Both sides of the second land 107 and the second land 107 protrude from the score region 105 and may form solder joints respectively soldered to other components. In this way, the welding is more stable when welding with the flip member and the inner terminal of the electrode, thereby avoiding the problem that the solder joint is accidentally broken under the action of an external force.
  • the height direction of the score member 101 is relative to the length direction thereof, and after being assembled to the cover plate, its height direction is the up-and-down direction with respect to the cover plate.
  • the first land 103, the scored region 105, and the second land 107 are sequentially formed in a zigzag structure in the height direction. That is, only one side of the first land 103 and the second land 107 protrudes from the notch region 105 and can form a one-sided pad, so that the corner of the zigzag structure can be buffered when an external force is received. The effect, thereby protecting the score 104 on the scored region 105 between the first weld zone 103 and the second weld zone 107, reduces the likelihood of the score 104 being accidentally broken.
  • the welding area of the score 104 and the first land 103 and the second land 107 is disposed on different planes in the height direction or the other direction, thereby To reduce the impact of heat such as laser welding on the score.
  • the inverting member 102 is formed as an elongated structure extending in the longitudinal direction of the cover plate, and is disposed parallel to the elongated structure of the incision member 101,
  • the flip member 102 has a first connection region 115 extending along the first land 103 and soldered to each other.
  • the first connection region 115 is formed in an elongated structure and the lower surface is formed with a solder bath for accommodating the first land 103.
  • the soldering groove may be an n-shaped groove having an n-shaped cross section or an L-shaped groove having an L-shaped cross section.
  • the welding groove is an n-shaped groove to be opposite to the two sides of the first bonding zone 103 accommodated in the welding groove.
  • Edge welding for example by brazed joint welding, makes the electrical connection stable.
  • the soldering groove may also have an L-shaped structure to be welded to a side edge of the first bonding portion accommodated in the soldering groove away from the second bonding portion. For example, by brazed seam welding. This makes it possible to form a buffer for the scored area 105 by the corners of the zigzag structure when an external force is received.
  • the score 104 may be disposed in parallel with the first land 103 and the second land 107, respectively, so that the flip member When the 102 is turned over, the maximum vertical tearing force can be applied to each portion of the score 104 without generating a component force in the other direction, thereby providing the sensitivity of the current interrupting device.
  • the end of the score 104 may penetrate to the edge of the scored area 105 or be spaced apart from the edge of the scored area 105.
  • the edge which penetrates to the scored area 105 can improve the sensitivity of the current interrupting device, and the interval of the gap can ensure the score of the internal resistance of the indented member 101 when the internal pressure of the battery is fluctuated within a low range. There is no effect, only when the internal pressure value exceeds the predetermined value, the internal pressure of the battery can break the score 104.
  • the end of the score 104 and the edge of the scored area 105 can be designed.
  • the separation distance is 0.01-1 mm, and further, the distance between the end of the score 104 and the edge of the score area 105 is 0.05-0.5 mm.
  • the thicknesses of the first land 103 and the second land 107 are respectively greater than or equal to the thickness of the score region 105.
  • the thickness direction of the region 107 is in the up and down direction in the drawing, that is, welding with the side edges of the soldering groove, which can be understood as being perpendicular to the direction of the cover plate 110, and the thickness direction of the notch region 105 is parallel to the cover plate 110.
  • the direction, that is, the width direction of the entire indented member, is formed on the side of the notch region 105 that extends up and down.
  • the first weld zone 103 and the second weld zone 107 have a thickness of 0.4-5 mm and the score zone 105 has a thickness of 0.05-1 mm. Further, the first land 103 and the second land 107 have a thickness of 0.8 to 3 mm, and the notch 105 has a thickness of 0.1 to 0.8 mm. Therefore, by setting the thickness of the scored region 105 to be less than or equal to the thicknesses of the first land 103 and the second land 107, it is possible to ensure the welding strength of the welded region and provide a basis for high-quality scoring.
  • the thickness of the first land 103 is also possible to design the thickness of the first land 103 to be equal to or smaller than the thickness of the second land 107. Therefore, it is possible to avoid more occupation space of the flip member 102 while ensuring the welding strength, so that the flip member 102 can be designed to be thicker in the height direction as much as possible, so as to perform a large flipping action to break the score 104. Thereby, the electrical connection between the electrode outer terminal 112 and the inner lead-out member 109 is broken.
  • the score 104 may be a strip formed on one side of the score region 105, or as shown in FIG. 5, formed on both sides of the score region 105. Two. When the score 104 is two, the two scores are aligned on both sides of the score area 105 to enhance the sensitivity of the current interrupting device.
  • the inverting member has a second connecting portion 116 formed in an elongated structure, and a supporting ring 113 is sealingly connected between the lower side of the second connecting portion 116 and the cover plate 110 .
  • the outer periphery of the electrode outer terminal 112 is electrically connected to the upper side of the second connection region 116.
  • the support ring can be formed as an elongate structure extending along the length of the cover plate, and further, as shown in Figure 9, the support ring can be designed to not extend beyond the width edge of the cover to avoid affecting other equipment outside the battery.
  • the inner lead member 109 is formed into a sheet-like structure, the sheet-like structure
  • the sheet-like structure There is an intermediate land 131 electrically connected to the score member 101 and an edge land 132 electrically connected to the cell, and the edge land 132 is located outside the intermediate land 131.
  • the thickness of the edge land 132 is greater than or equal to the thickness of the intermediate land 131.
  • the thickness of the intermediate land 131 is small, it can form a step structure with the edge land 132 and have a height difference, that is, as shown in FIG. 8, the two are not in the same plane in the vertical direction, so that the edge welding zone is performed.
  • the scoring member 101 attached to the intermediate land can be cushioned.
  • the intermediate weld zone 131 has a thickness of 0.1-1 mm and the edge weld zone 132 has a thickness of 1-5 mm, in accordance with some embodiments of the present disclosure.
  • the edge land 132 is formed as an annular joint region surrounding the intermediate land 131, wherein the figure is a cut-away partial view through which the intermediate land 131 can be passed.
  • the edge weld zone may also be a strip weld zone located on either side of the intermediate weld zone 131.
  • the intermediate weld zone 131 is not closed so that both ends of the intermediate weld zone have openings, and such deformations fall within the scope of the present invention.
  • the intermediate weld zone 131 and the edge weld zone 132 may be integrally formed, which can reduce the number of welded parts, and the assembly is simpler.
  • the two can also be connected separately, for example, by welding, which can increase the pair. The buffering effect of the intermediate weld zone.
  • the intermediate weld zone of the inner take-up member 109 may be formed with a receiving groove 133 for receiving the second land 107 of the score member 101, the receiving groove 133 being formed along the second portion forming the elongated structure.
  • the weld zone 107 extends to form an elongated structure, and may be a through hole structure that penetrates the intermediate weld zone in the up and down direction, or may not penetrate, and may be seam welded (brazed, etc.) with the second weld zone 107. Achieve welding.
  • the unit battery 200 provided by the present disclosure includes a casing 111, a battery core housed in the casing, and the above-described battery cover assembly 100 of the package casing, and the inner lead member 109 is electrically connected to the battery core, and The flip member 102 is in gaseous communication with the interior of the housing.
  • the battery module 300 provided by the present disclosure is provided with the above-mentioned single battery 200 in the battery module 300 .
  • the power battery 400 provided by the present disclosure includes a package body and the above-described battery module 300 disposed in the package body.
  • the present disclosure provides an electric vehicle 500 provided with the above-described power battery 400.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

一种电池盖板组件、单体电池、电池模组、动力电池及电动汽车。电池盖板组件包括盖板(110)、内引出件(109)和电极外端子(112)，电流中断装置包括刻痕件(101)和翻转件(102)，刻痕件包括刻痕区(105)、第一焊接区(103)以及第二焊接区(107)，在刻痕件(101)垂直于盖板(110)长度方向的竖直截面上，第一焊接区(103)、刻痕区和第二焊接区(107)呈条状依次设置，第一焊接区和第二焊接区的厚度大于或等于刻痕区(105)的厚度。

Description

电池盖板组件、单体电池、电池模组、动力电池及电动汽车
相关申请的交叉引用
本公开基于申请号为201711408948.0，申请日为2017年12月22日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此引入本公开作为参考。
技术领域
本公开涉及电池领域，涉及一种电池盖板组件，使用该电池盖板组件的单体电池，使用该单体电池的电池模组，使用该电池模组的动力电池和使用该动力电池的车辆。
背景技术
电池作为储能单元在各行各业均有重要作用，例如动力电池广泛用于新能源汽车等领域，其中动力电池的电池包内可以具有由多个单体电池相互串联或并联组成的电池模组以实现充放电的工作。其中，动力电池在充放电过程中，通常通过BMS(电池管理系统)监控电压和电流的变化并计算荷电状态。如果电压采样出现问题，就可能导致电池过充，特别是对于三元体系来说，如过充达到一定程度更会出现电池燃烧爆炸的危险。
相关技术中，先对电池的电压和电流进行监测，通过电流积分法和开路电压法计算电池电量，并以此控制电池的充放电。但是也存在不足，例如电池电压采样或者电流采样失效，或者软件失效，导致电池长时间充电得不到控制，特别是在使用充电桩充电的情况下，充电桩与电池管理器通讯失效时，过充无法控制，电池过充到一定程度，会引起电池鼓涨甚至爆炸起火。
因此，提供一种能够自身强制断开充放电电路的电流中断技术具有积极意义。
发明内容
本公开的目的是提出一种涉及一种电池盖板组件，使用该电池盖板组件的单体电池，使用该单体电池的电池模组，使用该电池模组的动力电池和使用该动力电池的车辆。
本公开还提出一种具有上述电池盖板组件的单体电池。
本公开还提出一种具有上述单体电池的电池模组。
本公开还提出一种具有上述电池模组的动力电池。
本公开还提出一种具有上述动力电池的电动汽车。
根据本公开第一方面的电池盖板组件，包括盖板、位于该盖板内侧的内引出件和位于该盖板外侧的电极外端子，所述内引出件和所述电极外端子通过电流中断装置电连接，所述电流中断装置包括刻痕件和翻转件，所述刻痕件包括形成有刻痕的刻痕区、用于与所述翻转件电连接的第一焊接区以及用于与所述内引出件电连接的第二焊接区，所述翻转件能够在气压作用下动作以通过拉断所述刻痕，在所述刻痕件垂直于所述盖板长度方向的竖直截面上，所述第一焊接区、刻痕区和第二焊接区呈条状依次设置，并且所述刻痕在所述刻痕区上沿所述盖板的长度方向延伸，所述第一焊接区和所述第二焊接区的厚度大于或等于所述刻痕区的厚度。
根据本公开的电池盖板组件，通过拉断刻痕同样能够断开第一焊接区和第二焊接区之间的电连接，起到电流中断的作用。另外在竖直方向上呈条状的布置方式，即刻痕件在高度方向上的尺寸大于其在宽度方向上的尺寸，这样可以有效节省刻痕件在宽度方向上的尺寸，有利于整体电流中断装置在宽度方向上不超出盖板的范围。并且第一焊接区103和第二焊接区107的厚度不小于刻痕区的厚度既能够保证焊接区域的焊接强度，又能够为高质量的刻痕加工提供基础。
根据本公开的一些实施例，所述第一焊接区和所述第二焊接区的厚度为0.4-5mm，所述刻痕区的厚度为0.05-1mm。
根据本公开的一些实施例，所述第一焊接区和所述第二焊接区的厚度为0.8-3mm，所述刻痕区的厚度为0.1-0.8mm。
根据本公开的一些实施例，所述刻痕区形成为沿所述盖板到的长度方向延伸的长形结构，所述刻痕沿该长形结构的长度方向延伸，并且所述第一焊接区和所述第二焊接区设置在所述刻痕区高度方向的两侧，
根据本公开的一些实施例，所述刻痕分别与所述第一焊接区和所述第二焊接区平行。
根据本公开的一些实施例，所述刻痕的端部贯通至所述刻痕区边缘或与所述刻痕区的边缘间隔设置。
根据本公开的一些实施例，所述第一焊接区、所述刻痕区和所述第二焊接区在高度方向上依次形成为工字型结构。
根据本公开的一些实施例，所述刻痕为形成在所述刻痕区单面上的一条，或者为形成在所述刻痕区双面上的两条。
根据本公开的一些实施例，所述翻转件形成为沿所述盖板长度方向延伸的长形结构， 并且具有沿所述第一焊接区延伸并相互焊接的第一连接区，该第一连接区形成为长形结构并且下表面形成有容纳所述第一焊接区的焊槽。
根据本公开的一些实施例，所述焊槽为n型槽，以与所述第一焊接区的两个侧边缘焊接。
根据本公开的一些实施例，所述电极外端子与所述翻转件电连接，所述刻痕件电连接在所述内引出件上，所述翻转件具有形成为长形结构的第二连接区，所述第二连接区的下侧与所述盖板之间密封连接有支撑环，所述电极外端子的外周缘电连接在所述第二连接区的上侧。
根据本公开的一些实施例，所述支撑环形成为沿所述盖板长度方向延伸的长形结构且不超出所述盖板的宽度边缘。
根据本公开的一些实施例，所述内引出件形成为片状结构，该片状结构具有与所述刻痕件电连接的中间焊接区和与电芯电连接的边缘焊接区，所述边缘焊接区位于所述中间焊接区的外侧。
根据本公开的一些实施例，所述边缘焊接区的厚度大于等于所述中间焊接区的厚度。
根据本公开的一些实施例，所述中间焊接区的厚度为0.1-1mm，所述边缘焊接区的厚度为1-5mm。
根据本公开的一些实施例，所述边缘焊接区形成为围绕所述中间焊接区的环形连接区，或者位于该中间焊接区两侧的条形焊接区。
根据本公开的一些实施例，所述中间焊接区和所述边缘焊接区一体成型或分体相连。
根据本公开第二方面的单体电池，包括外壳、容纳在外壳内的电芯、以及封装所述外壳的电池盖板组件，其特征在于，所述电池盖板组件为本公开提供的电池盖板组件，所述内引出件与所述电芯电连接，并且所述翻转件与所述外壳的内部气体连通。
根据本公开第三方面的电池模组，该电池模组内设置有本公开提供的单体电池。
根据本公开第四方面的动力电池，包括包体和设置在该包体内的电池模组，所述电池模组为本公开提供的电池模组。
根据本公开第五方面的电动汽车，该电动汽车设置有本公开提供的动力电池。
本公开的其他特征和优点将在随后的具体实施方式部分予以详细说明。
附图说明
附图是用来提供对本公开的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本公开，但且不构成对本公开的限制。在附图中：
图1是本公开一种电池模组的部分分解立体示意图；
图2是本公开的实施方式中电流中断装置的翻转件的部分立体结构示意图；
图3是本公开的实施方式电流中断装置的翻转件的俯视平面图；
图4是本公开的实施方式电池盖板组件的单体电池的立体结构示意图；
图5是本公开的实施方式中电流中断装置的刻痕件的第一种结构的立体示意图；
图6是本公开的实施方式中电流中断装置的刻痕件的第二种结构的立体示意图；
图7是本公开的实施方式中电流中断装置的刻痕件的第三种结构的立体示意图；
图8是本公开的实施方式中基于图5的刻痕件的电池盖板组件的剖视图；
图9是本公开的实施方式中基于图7的刻痕件的电池盖板组件的剖视图；
图10是本公开的实施方式中一种内引出件的部分结构示意图；
图11是本公开的实施方式中另一种内引出件的部分结构示意图；
图12是本公开一种电动汽车的结构示意图。
具体实施方式
以下结合附图对本公开的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本公开，且不用于限制本公开。
在本公开中，在未作相反说明的情况下，使用的方位词如“上、下、左、右”通常是以相应附图的图面方向为基准定义的，“内、外”是指相应部件轮廓的内和外。
如图1至图11所示，本公开提供了一种电流中断装置及其刻痕件、翻转件、使用该电流中断装置的电池盖板组件100，使用该电池盖板组件100的单体电池200，使用该单体电池200的电池模组300，使用该电池模组300的动力电池400和使用该动力电池400的电动汽车500的技术方案。
其中如图1所示，电流中断装置设置在电极外端子112和内部电芯之间以用于切断电池内外的电路。其中，在单体电池200中，多个单体电池200通过串联或并联组成电池模组300，并可以置入电池包内而形成动力电池400。此外，除动力电池400领域外，本公开中提供的各种技术方案还可以广泛应用于其他的电池领域中。一些实施例中，本公开通过两个实施方式介绍所涉及的电流中断装置。下面将结合附图对各个实施方式进行详细描述。
首先，如图1和图4所示，本公开的实施方式中提供一种电池模组300，包括多个单体电池200，其中，单体电池200可以包括外壳111、容纳在外壳内的电芯、以及封装外壳的盖板110，其中电极外端子112设置在盖板上，以用于通过各种电极引出件119 完成电流的输入和输出。其中，如图8所示，电池盖板组件100还具有该电芯电连接的内引出件109，电流中断装置设置在电极外端子112与内引出件109之间以可以控制电极端子的电流的输入和输出。即电流中断装置在单体电池200中常规状态下为电芯导通的状态，此时电极端子可以正常进行电流的输入和输出，以完成单体电池200的充放电工作，而在危险状态下，例如电池出现过充时，电流中断装置可以中断电极端子的电流输入和电流输出，从而避免电池出现过充等问题。因此，作为重要的安全措施，电流中断装置的可靠性至关重要，即需要电流中断装置可以快速响应。
在本公开中，各实施方式中的电流中断装置均为感应气压的机械结构，电流中断装置与单体电池200的外壳内部气体连通并能够在气压下作用断开流经的电流。本公开的一些实施例中，可以通过断开内部的部件连接来中断电流的传递，从而及时切断电池的充放电。其中所利用的气压来源为：当电池出现过充等危险状态时，电池内部会产生气体继而使得外壳内部的气压升高，或者当电池在使用过程中出现异常导致电池温度升高时会使得电池内部气压升高，从而产生驱动电流中断装置的气压动力。
以如图8的所述的实施方式为例，该电流中断装置具有刻痕件101和与该刻痕件101相连以相互电连接的翻转件102，并且翻转件102与刻痕件101能够在气压作用下断开电连接。在本公开的实施方式中，可以为将二者中至少一个的本身断开，例如通过在相应部件上加工出薄弱的刻痕来实现本身结构的断开，从而实现电连接的断开，一些实施例中在刻痕件101上形成有刻痕104。即，在内部的气压作用下，通过翻转件102的翻转动作可以拉断刻痕104而实现电极外端子112与内引出件109之间电连接的断开，从而实现切断电流的传递的目的。
之所以采用这种方式，是考虑由于在动力电池400的领域中，需要通过的电流较大，因此需要保证刻痕件101和翻转件102的焊接结构稳定，避免大电流熔断焊接结构。这样通过刻痕件101的刻痕104的设置，即在相应部分加工出强度小于其他区域的薄弱部，就可以完成刻痕件101和翻转件102的完全断开。
其中，在本公开的实施方式中，如图2和图3所示，翻转件102为形成锥型的片状结构，该锥形的小端形成为第一连接区115，大端远离刻痕件101并形成为第二连接区116。该锥形结构可以将第一连接区115和第二连接区116异面设置，并且能够提供翻转件102受力向上翻转的空间，以拉断刻痕104，进而断开电极外端子112与内引出件109之间的电连接。在其他可能的实施方式中，翻转件102还可以为具有弹性的平面件等。
如图8和图9所示，在本公开的实施方式中，为了保证能够被电池内部的气体作用， 翻转件102的外周缘下侧与盖板110之间密封连接有支撑环113，电极外端子112的外周缘电连接在翻转件102的外周缘上侧，这样从电池内部产生的气体可以作用在翻转件102上而不会外泄。而为了能够使得翻转件102正常动作，电极外端子112形成为盖帽结构并且可以形成有通孔，以用于在翻转件102动作时排出气体，从而避免在气压作用下阻碍翻转件动作。另外在盖板110带电和绝缘两种实施方式中，支撑环113可以选择绝缘材料或者导电材料支撑。通常地，支撑环113可以为陶瓷环以使得盖板110绝缘而不带电。
如图2和图3所示，本公开的实施方式提供的电池盖板组件100，包括翻转件102，该翻转件在前述实施方式的基础上，形成为沿盖板110的长度方向延伸的长形结构。其中，本文中的长形结构是指在该长形结构的平行于盖板的截面中，沿盖板长度方向上的尺寸要大于其他方向上的尺寸。因此，如图4所示，由于翻转件102上形成为沿盖板长度方向延伸的长形结构，因此能够在保证与内部气体的接触面积的情况下，减少例如图1中包括该翻转件102的电流中断装置露出盖板110的部分沿高度方向超出盖板110的可能，甚至如图9所示，能够完全在盖板的范围之内，从而避免对盖板110以外的其他装置造成干涉，同时翻转灵敏度得到保证。
其中如图2至图4所示，在本公开的实施方式中，该长形结构沿长度方向的端部为圆弧形，即其平行于盖板的截面具有中间的矩形和两端的弧形结构，即结构无拐角，从而在适应盖板110的结构的同时，便于形成环形的翻转件和其他对应的结构，例如与之配合的刻痕件101、支撑环113和电极外端子112。在其他实施方式中，长形结构还可以为腰形结构或椭圆结构，其腰形结构或椭圆截面的长轴即沿盖板的方向。在有些实施方式中，长形结构的平行与盖板的截面还可以形成为矩形截面等其他形状。
在本公开的实施方式中，由于与翻转件102在盖板110外连接的部件为电极外端子112和支撑环113，因此可以设计二者同样为相配合的长形结构，这样，为了部件之间的连接，至少翻转件102中与电极外端子112和支撑环113相连的第二连接区116形成为长形结构。其中的支撑环113由于与盖板110相连，可以设计其形成的长形结构不伸出盖板110的边缘，具体为盖板110的宽度边缘，其中可选该支撑环113的宽度边缘和盖板110的边缘对齐。以使得翻转件102获得较大的设计和受力空间。
在本实施方式中，如图2所示，第一连接区115也对应形成为沿盖板长度方向延伸的长形结构。所述长形结构沿长度方向的端部为圆弧形，所述长形结构也可以为椭圆或腰形结构。对应的刻痕件101则可以形成为如图5至图7所示的长形结构。
继续描述本实施方式中的翻转件102，翻转件102沿垂直于盖板110上表面的方向 为形成锥形的片状结构，该锥形的小端形成的第一连接区115形成为长形结构，大端远离刻痕件101并且形成第二连接区116，该第二连接区116与第一连接区115平行并形成为长形结构。一些实施例中，第二连接区116为翻边结构，以方便同时和支撑环113和电极外端子112相连。
在本实施方式中，为了保证连接强度，第一连接区115和第二连接区116的厚度分别大于二者之间的动作区域123厚度。一些实施例中，第一连接区和第二连接区的厚度为可以0.3-3mm，动作区域123的厚度可以为0.05-0.3mm。该设计同样适用于其他实施方式中的翻转件102。
如图5至图7所示，基于本公开的实施方式提供的电池盖板组件100，继续介绍本公开提供的三种刻痕件。不同于现有的刻痕形成为环形结构的刻痕件，本实施方式中提供的刻痕件101中，刻痕104为非闭环的长形刻痕。一些实施例中，在刻痕件101垂直于盖板110长度方向的竖直截面上，第一焊接区103、刻痕区105和第二焊接区107呈条状依次设置，并且刻痕104在刻痕区105上沿盖板110的长度方向延伸。这样通过拉断刻痕104同样能够断开第一焊接区103和第二焊接区107之间的电连接，起到电流中断的作用。另外在竖直方向上呈条状的布置方式，即刻痕件在高度方向上的尺寸大于其在宽度方向上的尺寸，这样可以有效节省刻痕件101在宽度方向上的尺寸，有利于整体电流中断装置在宽度方向上不超出盖板110的范围。
另外，在本实施方式中，刻痕区105形成为沿盖板的长度方向延伸的长形结构，即刻痕件长度方向上的尺寸大于其宽度方向和高度方向上的尺寸。其中的刻痕104沿该长形结构的长度方向延伸，从而形成非闭环的刻痕，根据本公开的一些实施例，刻痕104为直线形刻痕，在其他可能的实施方式中，刻痕还可以为曲线或折线等长形刻痕。并且为了实现刻痕104的拉断，第一焊接区103和第二焊接区107设置在刻痕区105高度方向的两侧。即如图的方位中，第一焊接区103、刻痕区105和第二焊接区107沿高度方向从上至下依次设置，从而在刻痕件101的垂直于盖板110的竖直截面上线性分布。从而有别于现有的成径向分布的环形刻痕件。这样，翻转件102受力翻转后，同样可以将刻痕104拉断，从而实现将电极外端子112与内引出件109之间的电流中断的目的。
如图5和图6所示，在一种实施例中，第一焊接区103、刻痕区105和第二焊接区107在高度方向上依次形成为工字型结构，即第一焊接区103和第二焊接区107的两侧均从刻痕区105凸出并可以形成分别和其他部件焊接的焊点。这样在与翻转件和电极内端子焊接时，焊接更加稳定，避免出现在外力作用下出现焊点意外断开的问题。其中刻痕件101的高度方向是相对于其长度方向而言的，在装配到盖板上之后，其高度方向即 相对于盖板的上下方向。在另一种实施例中，第一焊接区103、刻痕区105和第二焊接区107在高度方向上依次形成为Z字型结构。即，第一焊接区103和第二焊接区107只有一侧从刻痕区105凸出并可以形成单侧焊点，这样，在收到外力冲击时，Z字型结构的拐角处可以具有缓冲效果，从而保护位于第一焊接区103和第二焊接区107之间的刻痕区105上的刻痕104，而降低刻痕104意外断裂的可能。
另外，不论工字还是Z字，均能够使得本实施方式中，刻痕104与第一焊接区103和第二焊接区107的焊接区域设置在高度方向或其他方向上均在不同平面上，从而以减小激光焊接等热量对刻痕的影响。
为了适应这种长形刻痕件101，如图2所示，其中的翻转件102形成为沿盖板长度方向延伸的长形结构，并且和刻痕件101的长形结构相互平行的设置，其中，翻转件102具有的第一连接区115沿第一焊接区103延伸并相互焊接，该第一连接区115形成为长形结构并且下表面形成有容纳第一焊接区103的焊槽。其中焊槽可以为截面为n形的n型槽，也可以为截面为L型的L型槽。
一些实施例中，如图2和图7所示，当刻痕件101为工字型结构时，焊槽为n型槽，以与容纳进该焊槽的第一焊接区103的两个侧边缘焊接，例如通过钎焊缝焊焊接，从而使得二者电连接稳定。
另外，如图9所示，当刻痕件101为Z字型结构时，焊槽还可以L型结构，以与容纳进该焊槽的第一焊接区远离第二焊接区的侧边缘焊接，例如通过钎焊缝焊焊接。这样可以在收到外力时，通过Z字型结构的拐角形成对刻痕区105的缓冲。
在本实施方式中，不论工字型或Z字型结构，亦或是一半工字一半Z字，刻痕104可以设置分别与第一焊接区103和第二焊接区107平行，使得在翻转件102翻转时，能够对刻痕104的各部分均施加最大的垂直撕扯力，而不产生其他方向的分力，从而提供电流中断装置的灵敏度。
在本实施方式中，如图5或图6所示，刻痕104的端部可以贯通至刻痕区105边缘亦或与刻痕区105的边缘间隔设置。其中贯通至刻痕区105的边缘可以提升电流中断装置的灵敏度，而保有间隔则能保证刻痕件101在电池内部气压在低范围内波动时，电池内压对刻痕件101的刻痕104不会有影响，只有当内压值超过预定值时，电池内部压力才能将刻痕104拉断。
如图6所示，当刻痕104的端部与刻痕区105的边缘之间具有间隔时，尤其是两端具有间隔时，可以设计刻痕104的端部与刻痕区105的边缘的间隔距离为0.01-1mm，进一步地，刻痕104的端部与刻痕区105的边缘的间隔距离为0.05-0.5mm。从而既能够保 证电流中断装置的灵敏度，还能够保证刻痕不受外力或内部气压波动的影响而以外断开。
在本实施方式的工字型和Z字型的两种实施例中，第一焊接区103和第二焊接区107的厚度分别大于或等于刻痕区105的厚度。此处需要说明的是，由于刻痕区105的形成为板状结构，其厚度方向与第一焊接区103和第二焊接区107的厚度方向且不一致，其中第一焊接区103和第二焊接区107的厚度方向在图中为上下方向，即与焊槽的侧边缘进行焊接，其可以理解为垂直于盖板110的方向，而刻痕区105的厚度方向则为平行与盖板110的方向，即整体刻痕件的宽度方向，此时刻痕104形成在刻痕区105上下延伸的侧面上。
一些实施例中，第一焊接区103和第二焊接区107的厚度为0.4-5mm，刻痕区105的厚度为0.05-1mm。进一步地，第一焊接区103和第二焊接区107的厚度为0.8-3mm，刻痕区105的厚度为0.1-0.8mm。因此，通过设置刻痕区105的厚度小于等于第一焊接区103和第二焊接区107的厚度，既能保证焊接区域的焊接强度，又能为高质量的刻痕加工提供基础。
另外，还可以设计第一焊接区103的厚度等于或小于第二焊接区107的厚度。因此可以在保证焊接强度的同时，避免较多的占用翻转件102的装配空间，使得翻转件102可以尽量在高度方向上设计的较厚，以进行较大的翻转动作而拉断刻痕104，从而断开电极外端子112与内引出件109之间的电连接。
在本实施方式中，如图6和图7所示，刻痕104可以为形成在刻痕区105单面上的一条，或者如图5所示，为形成在刻痕区105双面上的两条。当刻痕104为两条时，两条刻痕在刻痕区105的两面上对齐设置，以提升电流中断装置的灵敏度。
在本实施方式中，如图8和图9所示，翻转件具有形成为长形结构的第二连接区116，第二连接区116的下侧与盖板110之间密封连接有支撑环113，电极外端子112的外周缘电连接在第二连接区116的上侧。这样，支撑环可以形成为沿盖板长度方向延伸的长形结构，并且更进一步地，可以如图9所示，设计支撑环不超出盖板的宽度边缘，从而避免影响电池外的其他设备。
为了适应长形刻痕件101的装配，在本公开实施方式提供的电池盖板组件100中如图8、图10和图11所示，内引出件109形成为片状结构，该片状结构具有与刻痕件101电连接的中间焊接区131和与电芯电连接的边缘焊接区132，边缘焊接区132位于中间焊接区131的外侧。其中，边缘焊接区132的厚度大于等于中间焊接区131的厚度。在中间焊接区131的厚度较小时，能够和边缘焊接区132构成台阶结构而具有高度差，即 如图8所示，二者在竖直方向上不在同一平面上，这样，在进行边缘焊接区和电芯极耳或者和与电芯之间的其他转接件焊接时，能够对连接在中间焊接区的刻痕件101起到缓冲作用。
一些实施例中，为了保证结构强度和缓冲作用，根据本公开的一些实施例，中间焊接区131的厚度为0.1-1mm，边缘焊接区132的厚度为1-5mm。另外在结构上，如图10所示，边缘焊接区132形成为围绕中间焊接区131的环形连接区，其中该图为被截取的部分图，通过环形的边缘焊接区132可以将中间焊接区131包围，另外如图11所示，边缘焊接区还可以为位于该中间焊接区131两侧的条形焊接区。即不封闭中间焊接区131，使得中间焊接区两端具有开口，对于此类变形均落在本发明的保护范围中。另外，中间焊接区131和边缘焊接区132可以一体成型，这样可以减少部件的焊接数量，装配更加简单，在一些实施方式中，二者还可以分体相连，例如通过焊接相连，这样可以增加对中间焊接区域的缓冲作用。
进一步，如图8所示，内引出件109的中间焊接区上可以形成有容纳刻痕件101的第二焊接区107的容纳焊槽133，该容纳焊槽133沿形成长形结构的第二焊接区107延伸而同样形成长形结构，并且可以是在上下方向上贯通中间焊接区的通孔结构，也可以不贯通，其与第二焊接区107之间可以通过缝焊(钎焊等)实现焊接。
如图12所示，本公开提供的单体电池200，包括外壳111、容纳在外壳内的电芯、以及封装外壳的上述的电池盖板组件100，内引出件109与电芯电连接，并且翻转件102与外壳的内部气体连通。
如图12所示，本公开提供的电池模组300，该电池模组300内设置有上述的单体电池200。
如图12所示，本公开提供的动力电池400，包括包体和设置在该包体内的上述的电池模组300。
如图12所示，本公开提供的电动汽车500，该电动汽车500设置有上述的动力电池400。
以上结合附图详细描述了本公开的五种实施方式，但是，本公开并不限于上述实施方式中的具体细节，在本公开的技术构思范围内，可以对本公开的技术方案进行多种简单变型，这些简单变型均属于本公开的保护范围。
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合，为了避免不必要的重复，本公开对各种可能的组合方式不再另行说明。
此外，本公开的各种不同的实施方式之间也可以进行任意组合，只要其不违背本公开的思想，其同样应当视为本公开所公开的内容。

Claims (21)

  1. 一种电池盖板组件，其特征在于，包括盖板、位于该盖板内侧的内引出件和位于该盖板外侧的电极外端子，所述内引出件和所述电极外端子通过电流中断装置电连接，所述电流中断装置包括刻痕件和翻转件，所述刻痕件包括形成有刻痕的刻痕区、用于与所述翻转件电连接的第一焊接区以及用于与所述内引出件电连接的第二焊接区，所述翻转件能够在气压作用下动作以拉断所述刻痕，在所述刻痕件垂直于所述盖板长度方向的竖直截面上，所述第一焊接区、刻痕区和第二焊接区呈条状依次设置，并且所述刻痕在所述刻痕区上沿所述盖板的长度方向延伸，所述第一焊接区和所述第二焊接区的厚度大于或等于所述刻痕区的厚度。
  2. 根据权利要求1所述的电池盖板组件，其特征在于，所述第一焊接区和所述第二焊接区的厚度为0.4-5mm，所述刻痕区的厚度为0.05-1mm。
  3. 根据权利要求2所述的电池盖板组件，其特征在于，所述第一焊接区和所述第二焊接区的厚度为0.8-3mm，所述刻痕区的厚度为0.1-0.8mm。
  4. 根据权利要求1-3中任一项所述的电池盖板组件，其特征在于，所述刻痕区形成为沿所述盖板到的长度方向延伸的长形结构，所述刻痕沿该长形结构的长度方向延伸，并且所述第一焊接区和所述第二焊接区设置在所述刻痕区高度方向的两侧，
  5. 根据权利要求4所述的电池盖板组件，其特征在于，所述刻痕分别与所述第一焊接区和所述第二焊接区平行。
  6. 根据权利要求4所述的电池盖板组件，其特征在于，所述刻痕的端部贯通至所述刻痕区边缘或与所述刻痕区的边缘间隔设置。
  7. 根据权利要求1-6中任一项所述的电池盖板组件，其特征在于，所述第一焊接区、所述刻痕区和所述第二焊接区在高度方向上依次形成为工字型结构。
  8. 根据权利要求1-7中任一项所述的电池盖板组件，其特征在于，所述刻痕为形成在所述刻痕区单面上的一条，或者为形成在所述刻痕区双面上的两条。
  9. 根据权利要求4所述的电池盖板组件，其特征在于，所述翻转件形成为沿所述盖板长度方向延伸的长形结构，并且具有沿所述第一焊接区延伸并相互焊接的第一连接区，该第一连接区形成为长形结构并且下表面形成有容纳所述第一焊接区的焊槽。
  10. 根据权利要求9所述的电池盖板组件，其特征在于，所述焊槽为n型槽，以与所述第一焊接区的两个侧边缘焊接。
  11. 根据权利要求9所述的电池盖板组件，其特征在于，所述电极外端子与所述翻 转件电连接，所述刻痕件电连接在所述内引出件上，所述翻转件具有形成为长形结构的第二连接区，所述第二连接区的下侧与所述盖板之间密封连接有支撑环，所述电极外端子的外周缘电连接在所述第二连接区的上侧。
  12. 根据权利要求11所述的电池盖板组件，其特征在于，所述支撑环形成为沿所述盖板长度方向延伸的长形结构且不超出所述盖板的宽度边缘。
  13. 根据权利要求1-12中任一项所述的电池盖板组件，其特征在于，所述内引出件形成为片状结构，该片状结构具有与所述刻痕件电连接的中间焊接区和与电芯电连接的边缘焊接区，所述边缘焊接区位于所述中间焊接区的外侧。
  14. 根据权利要求13所述的电池盖板组件，其特征在于，所述边缘焊接区的厚度大于等于所述中间焊接区的厚度。
  15. 根据权利要求14所述的电池盖板组件，其特征在于，所述中间焊接区的厚度为0.1-1mm，所述边缘焊接区的厚度为1-5mm。
  16. 根据权利要求13所述的电池盖板组件，其特征在于，所述边缘焊接区形成为围绕所述中间焊接区的环形连接区，或者位于该中间焊接区两侧的条形焊接区。
  17. 根据权利要求13所述的电池盖板组件，其特征在于，所述中间焊接区和所述边缘焊接区一体成型或分体相连。
  18. 一种单体电池，其特征在于，该单体电池包括外壳、容纳在外壳内的电芯、以及封装所述外壳的电池盖板组件，所述电池盖板组件为根据权利要求1-17中任意一项所述的电池盖板组件，所述内引出件与所述电芯电连接，并且所述翻转件与所述外壳的内部气体连通。
  19. 一种电池模组，其特征在于，该电池模组内设置有根据权利要求18中任意一项所述的单体电池。
  20. 一种动力电池，其特征在于，包括包体和设置在该包体内的电池模组，所述电池模组为根据权利要求19所述的电池模组。
  21. 一种电动汽车，其特征在于，该电动汽车设置有根据权利要求20所述的动力电池。
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1217826A (zh) * 1996-03-04 1999-05-26 波利斯托尔公司 具有脆性连接片断路机构的电池输出端组件
WO2015146365A1 (ja) * 2014-03-28 2015-10-01 株式会社豊田自動織機 電流遮断装置とそれを用いた蓄電装置
CN106328856A (zh) * 2015-06-17 2017-01-11 深圳市沃特玛电池有限公司 一种高可靠性锂电池盖帽
CN207818749U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车
CN207818643U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车
CN207818641U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车
CN207818642U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3222963B2 (ja) * 1992-12-25 2001-10-29 三洋電機株式会社 防爆型の密閉電池

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1217826A (zh) * 1996-03-04 1999-05-26 波利斯托尔公司 具有脆性连接片断路机构的电池输出端组件
WO2015146365A1 (ja) * 2014-03-28 2015-10-01 株式会社豊田自動織機 電流遮断装置とそれを用いた蓄電装置
CN106328856A (zh) * 2015-06-17 2017-01-11 深圳市沃特玛电池有限公司 一种高可靠性锂电池盖帽
CN207818749U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车
CN207818643U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车
CN207818641U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车
CN207818642U (zh) * 2017-12-22 2018-09-04 比亚迪股份有限公司 电池盖板组件、单体电池、电池模组、动力电池及电动汽车

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