WO2017143752A1 - Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique - Google Patents

Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique Download PDF

Info

Publication number
WO2017143752A1
WO2017143752A1 PCT/CN2016/097404 CN2016097404W WO2017143752A1 WO 2017143752 A1 WO2017143752 A1 WO 2017143752A1 CN 2016097404 W CN2016097404 W CN 2016097404W WO 2017143752 A1 WO2017143752 A1 WO 2017143752A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
cover plate
score
air pressure
electrode lead
Prior art date
Application number
PCT/CN2016/097404
Other languages
English (en)
Chinese (zh)
Inventor
胡世超
蒋露霞
鲁鹏
朱建华
朱燕
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201610104654.8A external-priority patent/CN107123778B/zh
Priority claimed from CN201620143107.6U external-priority patent/CN205621794U/zh
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 WO2017143752A1 publication Critical patent/WO2017143752A1/fr

Links

Images

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
    • H01M50/50—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
    • 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 invention relates to the field of batteries, and in particular to a single battery, a battery module including the same, a power battery including the battery module, and an electric vehicle including the power battery.
  • the battery pack of the power battery may have a battery module in which a plurality of single cells are connected in series or in parallel.
  • the battery pack of the power battery may have a battery module in which a plurality of single cells are connected in series or in parallel.
  • the state of charge is usually calculated by monitoring the change of voltage and current through the BMS (Battery Management System). If there is a problem with the voltage sampling, it may cause the battery to overcharge. Especially for the ternary system, if the overcharge reaches a certain level, there is a danger of the battery burning and exploding.
  • the existing technical solution monitoring the voltage and current of the battery, calculating the battery power by the current integration method and the open circuit voltage method, and thereby controlling the charge and discharge management of the battery.
  • deficiencies such as battery voltage sampling or current sampling failure, or software failure, resulting in long-term battery charging is not controlled, especially in the case of charging pile charging, charging pile and battery manager communication failure, overcharge Uncontrollable, if the battery is overcharged to a certain extent, it will cause the battery to rise or even explode.
  • An object of the present invention is to provide a single battery which is ingeniously capable of forcibly breaking a circuit in a dangerous state and capable of avoiding a danger such as explosion of a battery.
  • the present invention provides a unit cell including an outer casing, a battery core housed in the outer casing, an electrode terminal electrically connected to the electric core, and a cover plate enclosing the outer casing, An electrode terminal is disposed on the cover plate, the unit cell includes a first electrode lead-out member electrically connected to the battery core, and a second electrode lead-out member electrically connected to the electrode terminal, the cover plate Also provided is an explosion-proof valve in communication with a gas inside the outer casing, the explosion-proof valve having a flip member connecting the first electrode lead-out member and the second electrode lead-out member, the first electrode lead-out member and/or the Forming a first score on the two electrode lead-out member, the first score being capable of being broken under the air pressure in the outer casing to interrupt the first electrode lead-out member and/or the second electrode lead-out member A current is provided on the flip member with a second score that can be broken by air pressure within the outer casing to allow gas within the outer casing to escape
  • the first score can be pulled down by a first air pressure in the outer casing
  • the second score can be pulled down by the action of the second air pressure
  • the second air pressure is greater than the first air pressure
  • the first electrode lead-out member and/or the second electrode lead-out member are a long piece structure, the first nicker Extending from one side edge to the other side edge along the width direction of the elongate structure.
  • the inverting member has an annular outer wall, and the first electrode extracting member and the second electrode extracting member are respectively connected to the annular outer wall.
  • the outer periphery of the inverting member is relatively fixedly insulated from the cover plate.
  • a first ceramic ring is sealingly connected between the outer periphery of the inverting member and the cover plate.
  • the cover plate is welded with a first transition piece, and the outer peripheral edge of the flip member is welded with a second transition piece, and the first transition piece and the second transition piece are identical to the first ceramic ring Axial brazing is connected.
  • the cover plate is formed with an annular boss, the first transition piece is supported on the annular boss, and the first ceramic ring abuts against the inner wall of the annular boss toward the second transition The piece extends.
  • the explosion-proof valve further includes a protective film that can be broken by air pressure, and the protective film seal covers the flip member.
  • the ratio of the residual thickness at the first score to the residual thickness of the second score is 1:3-1:1.2.
  • the electrode terminal comprises a pole passing through the cover plate, the pole being insulated from the cover plate by a second ceramic ring.
  • the invention also provides a battery module comprising a plurality of single cells, at least one of the single cells being the single cells provided by the invention, the adjacent single cells being connected by the electrode terminals.
  • the invention also provides a power battery, comprising a package body and a battery module located in the package body, wherein the battery module is the battery module provided by the invention.
  • the present invention also provides an electric vehicle provided with the power battery provided by the present invention.
  • FIG. 1 is a partially exploded perspective view of a power battery according to an embodiment of the present invention.
  • FIG. 2 is a schematic top plan view of two adjacent single cells of the present invention.
  • Figure 3 is a cross-sectional structural view taken from line A-A of Figure 2;
  • FIG. 4 is a schematic exploded view showing a current interrupting device according to an embodiment of the present invention.
  • Figure 5 is a schematic exploded view showing the flip member and the conductive member according to an embodiment of the present invention.
  • Figure 6 is a cross-sectional structural view showing the flip member and the conductive member in an assembled state
  • FIG. 7 is a schematic top plan view of a conductive member according to an embodiment of the present invention.
  • Figure 8 is a cross-sectional structural view showing a pole and a ceramic ring according to an embodiment of the present invention.
  • Figure 9 is a perspective view showing the structure of the pole of Figure 8.
  • Figure 10 is a cross-sectional view showing the structure of a pole and a ceramic ring according to an embodiment of the present invention.
  • Figure 11 is a perspective view showing the structure of the pole of Figure 10 and the ceramic ring;
  • FIG. 12 is a schematic structural view of two adjacent single cells according to an embodiment of the present invention.
  • Figure 13 is a perspective view showing the structure of a power battery according to an embodiment of the present invention.
  • Figure 14 is a perspective view showing the structure of a unit cell according to an embodiment of the present invention.
  • Figure 15 is a schematic exploded perspective view of a single cell of an embodiment
  • Figure 16 is an exploded perspective view showing the inverted member and the conductive member of an embodiment
  • Figure 17 is a partial cross-sectional structural view showing a single cell of an embodiment
  • Figure 18 is a partial cross-sectional structural view showing a single cell of an embodiment of the present invention.
  • Figure 19 is a schematic block diagram of a control system in accordance with one embodiment of the present invention.
  • FIG. 20 is a schematic exploded view of a unit cell according to an embodiment of the present invention.
  • FIG. 21 is a partial cross-sectional structural view of the unit cell of FIG. 20 after assembly;
  • Figure 22 is a partial cross-sectional structural view showing a single cell of one embodiment of the present invention.
  • FIG. 23 is a schematic structural diagram of a current interrupting device according to an embodiment of the present invention.
  • Figure 24 is a partial cross-sectional structural view showing a unit cell of one embodiment of the present invention.
  • orientation words such as “up, down, left, and right” are generally defined on the basis of the drawing directions of the corresponding drawings, and the "inside and outside” means Inside and outside of the contour of the corresponding part.
  • the invention provides a technical solution of a current interrupting device, a single battery, a battery module, a power battery and an electric vehicle.
  • the current interrupting device is disposed in the single battery, and the plurality of single cells are connected into the battery module in series or in parallel, and can be placed in the battery pack to form a power battery.
  • various technical solutions provided in the present invention can be widely applied to other battery fields.
  • the present invention relates to a single battery 100, 1100, 2100, 3100, 4100, which relates to a current interrupting device 200, 1200, 3200, 4200 and an explosion-proof valve 2200, and further relates to a power battery charging and discharging protection system. .
  • the various embodiments are described in detail below with reference to the drawings.
  • the present invention provides a battery module including a plurality of unit batteries 100, 1100, 2100, 3100, 4100, wherein the unit battery may include a housing, a battery core housed in the housing, and an electrode electrically connected to the battery core
  • the single battery includes a current interrupting device 200, 1200, 3200, 4200 or an explosion-proof valve 2200.
  • the current interrupting device or the explosion-proof valve is electrically connected to the electrode terminal, so that the current of the electrode terminal can be controlled by the action of the current interrupting device. Input and output. That is, the current interrupting device or the explosion-proof valve is in a state in which the battery cell is turned on in the normal state in the single cell, and at this time, the electrode terminal can normally input and output current, so as to complete the charging and discharging work of the single cell, and in a dangerous state. Under the condition that the battery is overcharged, the current interruption device or the explosion-proof valve can interrupt the current input and current output of the electrode terminal. And avoid problems such as overcharging of the battery.
  • the reliability of the current interrupt device is critical, that is, the current interrupt device is required to respond quickly.
  • the current interruption device or the explosion-proof valve can also be fixed relative to the cover plate, that is, the current interruption device or the explosion-proof valve can be directly fixed on the cover plate, or can be fixed on any component connected to the cover plate or opposite to the cover plate. For example, it is mounted on an electrode terminal provided on the cover.
  • the current interrupting device or the explosion-proof valve is a mechanical structure that induces air pressure.
  • the current interrupting device is in gas communication with the inside of the casing of the unit cell and is capable of acting to interrupt the current flowing under the air pressure.
  • the transfer of current can be interrupted by disconnecting the internal components, thereby cutting off the charge and discharge of the battery in time.
  • the source of the air pressure utilized is: when, for example, 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 temperature rises when the battery is abnormal during use causes the battery to rise.
  • the internal air pressure rises, thereby generating the pneumatic power of the drive current interrupting device or the explosion-proof valve.
  • Figures 1 through 12 provide some embodiments.
  • the current interrupting device 200 has a conductive member 201 and a flip member 202 electrically connected to the conductive member 201, and the flip member 202 and the conductive member 201 can be disconnected under the action of air pressure.
  • Electrical connection in the present invention, the manner of disconnecting the electrical connection may be different, wherein the connection point between the conductive member and the flip member may be disconnected, for example, the solder joint between the two is pulled off to realize the electrical connection.
  • it is also possible to disconnect at least one of the two for example by machining a weak nick on the corresponding component to achieve the disconnection of the structure itself, thereby achieving the disconnection of the electrical connection. That is, in the present invention, the purpose of breaking the mechanical structure under the action of air pressure to cut off the transmission of current is achieved.
  • the flip member 202 is electrically disconnected from the conductive member 201 by the flipping operation, thereby interrupting the electrode terminal 101. And the external circuit, stop charging the battery, so as to avoid the internal pressure of the battery continues to rise, to ensure the safety of the battery.
  • the electrode terminal 101 includes a post 104 electrically connected to the cell, for example connected to the cell by an inner lead, wherein the post 104 passes through the cap 102 to draw current from the housing.
  • the current interrupting device 200 is mounted on the pole 104. In this way, the air pressure inside the battery can be directly felt through the pole 104, and the sensitivity is high, and the current interruption device 200 and the electrode terminal can be separately connected to facilitate the processing.
  • the flip member 202 and the conductive member 201 are connected by a boss soldering structure, and the boss soldering structure includes a boss 203 and a connecting hole 204 for receiving the boss 203. And a ring-shaped solder joint 217 between the boss 203 and the connection hole 204.
  • the boss 203 is formed on the conductive member 201, and the connecting hole 204 is formed on the flip member 202. More specifically, the flip member 202 is formed as a first sheet-like structure, and the first sheet-like structure is formed with the connecting hole 204.
  • the conductive member 201 is formed as a second sheet-like structure, and the second sheet-like structure is formed with a boss 203.
  • the boss 203 may also be disposed on the flip member 202, and the connecting hole 204 is disposed on the conductive member 201.
  • the flip member 202 and the conductive member 201 may also be soldered by laser penetration welding or the like.
  • the way of disconnecting the electrical connection between the flipping member and the conductive member can be realized by the scoring, that is, the weak portion having less strength than other regions is processed in the corresponding portion, wherein in order to complete the complete disconnection of the conductive member and the flip member, the engraving is completed.
  • the mark typically surrounds the point of attachment of the conductive member and the flip member, such as the annular structure of the above-described boss welded structure.
  • the disconnection of the electrical connection is achieved by the disconnection of the conductive member or the flip member itself, wherein the score may be formed on the flip member or on the conductive member, and in one embodiment, the conductive member 201 is formed with a score.
  • the score 205 surrounds the connection point for connecting the flip member 202, that is, the conductive member 201 is provided with an annular score around the boss 203.
  • the notch 205 can be pulled off, so that the portion of the boss 203 surrounded by the score 205 is separated from the conductive member 201 with the flip member 202, thereby realizing the current. Disconnected.
  • a score can also be formed on the flipper 202.
  • the score 205 is elliptical.
  • the boss 203 is circular, and the center of the elliptical score 205 and the center of the boss 203 are shifted along the long axis direction of the ellipse. In this way, the area at both ends of the elliptical long axis can be unevenly stressed, thereby facilitating the pulling of the score 205 from the local point, thereby improving the sensitivity of the notch 205.
  • the conductive member flip member 202 is disposed coaxially with the electrode terminal 101, and the conductive member 201 is disposed obliquely with respect to the axis of the electrode terminal 101.
  • the lower position score can be first broken, thereby increasing the sensitivity of the score 205 being pulled off.
  • the score 205 is elliptical
  • the long axis of the elliptical design is inclined with respect to the axis of the conductive member, and is also inclined with the axis of the pole when the conductive member is mounted on the pole. Thereby, the region where the curvature of the long-axis end portion is large is first torn, thereby ensuring that the score 205 can be normally broken when necessary, and the current interrupting device 200 is normally operated.
  • the score 205 is easily pulled off from the weakened hole 206, and the size and number of the weakened holes 206 can be set according to actual conditions.
  • the weakened holes 206 are plural and spaced apart along the scores 205.
  • the weakened hole 206 can also serve as a gas guide, so that gas inside the battery can exert a gas pressure on the flip member 202 through the weakened hole 206.
  • the outer periphery of the flip member may be sealed, for example, by welding, to the cover plate so that the internal air pressure can force the flip member to break the score 205.
  • the outer end and the inner end are defined relative to the outer casing in the axial direction of the pole, and the inner and outer sides of the ring, such as the outer circumference, are in the radial direction relative to Defined by the center of the ring.
  • the score 205 thereon can also be broken.
  • the outer end surface of the pole post 104 is formed with a receiving hole 218, the conductive member 201.
  • the outer circumference is fixed at the capacity On the inner wall of the nanopore.
  • the conductive member 201 can be stably fixed by the outer circumference of the ring, and the region inside the score 205 is not connected to the post 104 so as to be able to be broken by an external force such as the pulling force of the flip member 202 or the direct pressure of the gas.
  • the current interrupting device 200 is in gas communication with the inside of the battery.
  • the poles 104 and 104' are formed with air guiding passages communicating with the inside of the casing and the current interrupting device 200.
  • air pressure is applied to the current interrupting device directly through the internal structure of the poles 104 and 104'. Make the structure simpler.
  • the air guiding channel includes two air guiding holes 103, wherein the first air guiding hole 103 is configured to communicate with the receiving hole 218 and the inside of the housing, that is, directly to the conductive member. 201 applies pressure to break the score 205. That is, the air guiding passage includes air guiding holes 103 for communicating the above-described receiving hole 218 and the inside of the casing. The second air guiding hole 103 is for communicating the flip member 202 and the inside of the casing, thereby pressing the flip member to break the score 205. In order to increase the force efficiency of the flip member 202, the air guiding hole 103 is a plurality of surrounding the receiving hole. Therefore, the sensitivity of the current interrupting device can be increased by the combination of the two air guiding holes 103.
  • the pole post 104' is fixedly coupled to the cap plate 102 to stabilize the electrode terminal structure.
  • the outer periphery of the pole 104' has a radial boss 105 fixedly connected to the cover plate 102, and a second air guiding hole 103 is formed thereon to allow gas to flow to the flip member 202.
  • the first type of air guiding holes 103 are formed in the poles 104' in the axial direction. That is, the air guiding hole 103 on the radial boss 105 is for pressing the flip member 202, and the air guiding hole 103 below the receiving hole 218 can directly press the conductive member 201. As shown in FIG.
  • the radial boss 105 and the pole body of the pole 104' are formed with air guiding holes 103, wherein the first air guiding hole 103 and the end surface on the pole body are The receiving holes 218 are connected, and the number is four and are equally spaced in the circumferential direction. In other embodiments, the number of the first air guiding holes 103 may be other numbers, which is not limited in the present invention.
  • the poles 104, 104', 104" need to be insulated from the cover plate while the cover plate is fixedly connected, and therefore, the poles 104, 104', 104"
  • the fixed connection is made on a ceramic ring 207, 207' that is sealingly connected to the cover plate 102, for example by ceramic brazing.
  • the reliability and weather resistance are stronger, and not only the stable sealing connection of the current interruption device but also the insulation of the two can be achieved.
  • the outer periphery of the poles 104, 104', 104" has radial bosses 105, 105', and the inner edges of the ceramic rings 207, 207' have radial supports 208, 208' that support the radial bosses 105, 105', wherein the radial projections
  • the stages 105, 105' are embedded in the ceramic rings 207, 207' and connected to the radial supports 208, 208', i.e., the radial supports 208, 208' are thinner to form a stepped receiving space for the poles 104, 104', 104" to be embedded.
  • the radial bosses 105' and the radial supports 208' are respectively disposed in a plurality of circumferential intervals, that is, The radial bosses 105' are plural and circumferentially spaced apart, and the radial supports 208' are also plural and circumferentially spaced apart, and the plurality of radial bosses and the plurality of radial supports are in one-to-one correspondence.
  • the ventilation can be realized by the interval between the adjacent radial bosses 105' and the radial support 208', the structure is simpler and more ingenious, and the processing is convenient, and no additional air guiding holes are needed on the poles 104", thereby
  • the area of the pole piece 104" in which the conductive member 201 is assembled is not affected, and the size of the conductive member 201 can be maximized, thereby increasing the size of the score and ensuring the sensitivity of the pull-off.
  • the radial bosses 105' are arranged at equal intervals. To balance connection stability and gas permeability. In other embodiments, the number of radial bosses may also be other numbers, such as four or more.
  • the outer end faces of the ceramic rings 207 and 207' are formed as a stepped structure having an inner ring and an outer ring, and the poles 104, 104', 104" are embedded in the inner ring.
  • the integral radial boss 105 In an embodiment, the inner ring is formed as a unitary annular radial support, and in the embodiment of the split radial boss 105', the inner ring forms a plurality of spaced apart radial supports 208' The overall structure is more compact and the connection is more stable.
  • the outer end surface of the ceramic ring 207, 207' is sealingly connected with a conductive ring 216, specifically connected to the outer ring, and the outer periphery of the flip member 202 is fixedly connected to the conductive On the ring 216, that is, the flip member 202 is connected to the ceramic ring 207, 207' through a conductive ring, which can establish a current loop between the flip member and the outside.
  • the current interruption is lost.
  • the conductive ring 216 is sealingly connected to the outer ring of the ceramic ring to be insulated from the pole, that is, the poles 104, 104', 104" and the conductive ring 216 are insulated by the ceramic ring.
  • the conductive ring 216 is sealingly connected to the ceramic ring. The outer periphery of the flip member is sealed so that the air pressure inside the outer casing can act on the flip member without leaking.
  • the outer end surface of the conductive ring 216 is formed with an L-shaped opening, and the inner end surface thereof is used for connecting the outer ring of the ceramic ring.
  • the outer periphery of the flip member 202 is embedded in the L-shaped opening, and the outer periphery is sealingly connected to the L-shaped opening by a cap 210 that covers the flip member 202.
  • the conductive ring 216 can establish a current loop through the electrode lead-out piece connected to the cap or directly connected to the outside, for example, between the adjacent unit cells 100, or adjacent battery modules can be connected through the electrode lead-out piece.
  • the inner end surface of the ceramic ring 207, 207' is sealingly connected with a transition ring 209, which can be connected to the ceramic ring 207, 207' by ceramic brazing, and the transition Ring 209 is sealingly attached to cover plate 102.
  • the transition ring 209 can also be such that the ceramic rings 207, 207' are spaced from the cover plate 102.
  • the ceramic rings 207, 207' are not directly assembled with the cover plate 102, the influence of the high temperature generated when the cover plate 102 is brazed by the ceramic ring can be avoided, and the area of the ceramic ring 207, 207' is not directly assembled due to the need to be directly assembled with the cover plate 102. It is limited and does not require special design, fabrication and assembly of the ceramic rings 207, 207'.
  • the transition ring 209 has an inner ring and an outer ring forming a Z-shaped structure, and the cover plate 102 is formed with a through hole through which the poles 104, 104', 104" pass.
  • the end surface of the through hole is a stepped structure, and the inner ring of the transition ring is embedded and supported in the step structure. That is, in FIG. 3, FIG. 8 and FIG. 10, the inner ring is located below and embedded in the through hole, thereby increasing the contact between the two. The area guarantees a stable connection.
  • the outer circumference of the flip member 202 needs to be sealed, in particular, the ceramic ring 207, 207' is sealingly connected between the outer periphery of the flip member and the cover plate, thereby Stable and reliable operation of the current interrupting device is achieved by the sealing of the ceramic structure.
  • the air pressure inside the outer casing can effectively act on the current Interrupt the device, thereby causing the current interrupt device Reliable work.
  • the ceramic rings 207, 207' are respectively connected to the conductive ring 216, the poles 104, 104', 104" and the transition ring 209 by ceramic brazing, that is, the four components can be formed first.
  • a separate assembly, and then the transition ring 209 is assembled to the cover plate 102 by laser welding, which is convenient to assemble without directly brazing the ceramic ring to the cover plate.
  • the conductive member 201 and the poles 104, 104', 104 "The laser welding can be connected.
  • the inverting member and the conductive member can be connected by laser penetration welding or the above-mentioned boss welding structure.
  • the cap 210 can be connected to the conductive ring by laser welding.
  • the poles 104, 104', 104" can be laser welded to the lead tabs of the cells to complete the assembly of the overall current interrupting device.
  • the above mainly describes the structure of the current interrupting device 200, and the arrangement of the current interrupting device 200 will be described below.
  • the 200-size design of the current interrupting device can be made larger, so that the pulling force can be increased by increasing the force receiving area when the air pressure is not variable.
  • the area of the flip member is designed to be large to increase the breaking force of the flip member.
  • the current interrupting device 200 is designed to extend radially out of the cover plate 102 to increase the size. In this case, in the battery module, there are a plurality of single cells 100.
  • the current interrupting device 200 is offset from the adjacent electrode terminals in the extending direction of the cover. In this way, the area where the cover terminal 102 is not provided with the electrode terminal 101 can be fully utilized, so that the protruding current interrupting device does not interfere with the structure on the adjacent cover plate, the space inside the battery pack is sufficiently saved, and the energy density in the package body is improved. It should be noted that the meanings of the current interrupting device and the adjacent electrode terminal, or the electrode terminal and the adjacent electrode terminal between the adjacent single cells in the present invention and the following are different singles. The connection of adjacent features between the body cells, rather than the connection of adjacent features on the same unit cell.
  • the current interrupting device 200 and the adjacent electrode terminals 101 are shifted from each other in the direction in which the cover plate extends. In other embodiments, the two may also be offset from one another in the height direction.
  • the current interrupting device 200 and the adjacent electrode terminals are connected by an L-shaped connecting member 214, and the L-shaped connecting member 214 has a cover.
  • the portion 211 and the lead portion 212 are covered and connected to the current interrupting device 200, and the lead portion 212 extends to the adjacent electrode terminal to be adjacent thereto.
  • the L-shaped connecting member as shown in FIG. 1 is first aligned with the adjacent electrode terminal in the extending direction of the cover plate and then extended to the electrode terminal.
  • the L-shaped connecting member may also first extend to Adjacent cover plates are then extended to the electrode terminals to achieve electrical connection.
  • the current interrupting device 200 includes a cap 210 covering the flip member 202, the cap 210 extending along the cover plate 102 to the adjacent
  • the electrode terminals are aligned, that is, have a cover portion 211 and a lead portion 212 which are arranged in a straight line, and are connected to adjacent electrode terminals by a linear type I-connecting member 215.
  • the I-type connector 215 can also be used to connect the electrode terminals 101 of the current cell 100 without the current interruption device 200.
  • the cap 210 of this shape can be used only in the overall battery module. This kind of connector can be.
  • a current interrupting device 200 is disposed between adjacent cells 100.
  • the width of the unit cell 100 is greater than the width of the unit cell in which the current interrupting device 200 is not provided, and the current interrupting device 200 extends near the edge of the width of the cover plate 102, so that the adaptation of the current interrupting device 200 can also be achieved.
  • the current interrupting device can be prevented from protruding from the cover plate, so that adjacent electrode terminals can be aligned with each other. This also prevents the current interrupting device 200 extending out of the cover plate 102 from affecting other structures such as the welded structure on the adjacent cover plate 102. And preferably, the current interrupting device and the adjacent electrode terminals may be connected by a linear type I connector 215.
  • the cell capacity in the body battery 100 is the same, thereby avoiding the existence of a single cell of different capacities under the same module, and avoiding the influence on the BMS.
  • the remaining space inside the casing can be filled with a partition, that is, the cell is filled with a partition to make the assembly structure of the cell stable.
  • the ratio of the volume of the battery cell to the separator may be 1:1 to 2:1, wherein the separator may be made of an electrolyte resistant material.
  • the number of the single cells of the current interruption device 200 may be no more than three; preferably, the current interruption is set.
  • the number of the single cells of the device 200 is three; preferably, the single cells of the current interrupting device 200 are single cells located at the end and the central portion of the battery module; wherein, if the battery module includes n
  • the single cells arranged at the end of the battery module are the first single cell of the battery module and the nth single cell of the battery module; when n is an odd number, the battery module
  • the single cell in the central part of the group is the (n+1)/2 single cell of the battery module; when n is an even number, the single cell in the central part of the battery module is the first of the battery module n/2 single cells or (n+2)/2 single cells, where n ⁇ 3.
  • the present embodiment provides a single cell 1100 including a housing, a battery core housed in the housing, an electrode terminal 1101 electrically connected to the battery core, and a package housing.
  • a cover plate 1102 is provided on the cover plate 1102 for input and output of current.
  • the unit cell 1100 further includes a current interrupting device 1200 in gas communication with the interior of the outer casing. Unlike the manner in which the electrode terminal is mounted on the electrode terminal according to the embodiment of FIGS. 1 to 12, the current interrupting device 1200 is disposed on the cover plate. Up and in gas communication with the interior of the housing, wherein the current interrupting device 1200 has a conductive member 1201 and a flip member 1202 electrically connected to the conductive member 1201.
  • the flip member 1202 and the conductive member 1201 can be electrically disconnected under the action of air pressure. That is, the current interrupting device 1200 operates in substantially the same manner as the current interrupting device according to the embodiment of FIGS. 1 to 12, and both open the circuit by sensing the inversion of the inverting member by the air pressure in the single cell.
  • the conductive member 1201 has There is a body portion 1299 connected to the flip member 1202 and a connecting portion 1298 extending from the body portion 1299 to the electrode terminal 1101 and connected to the electrode terminal 1101. Therefore, in the present embodiment, the current interrupting device 1200 is disposed on the cover plate. This avoids raising the height of the electrode terminal 1101, thereby increasing the battery capacity density by utilizing the length space of the cover.
  • the body portion 1299 of the conductive member 1201 is in gas communication with the inside of the casing and is formed with a score 1205 surrounding the connection point for connecting the flip member 1202. .
  • the score can be pulled down by the internal air pressure, thereby breaking the electrical connection between the flip member and the conductive member.
  • a vent hole 1206 is provided on the score 1205. In this way, not only can the air pressure be applied to the flip member 1202 through the vent hole 1206, but the pulling force is applied to the score through the flip member, and the housing 1205 can be easily pulled at the position of the vent hole 1206 to lift the flip member 1202.
  • the effect of the sensitivity, this time mark can also be set on the flip member.
  • the vent holes 1206 may be plural and spaced along the nick 1205. Further, for features such as scores and vent holes, the features in the embodiments according to Figs. 1 to 12 can be applied to the present embodiment.
  • the body portion and the flip member of the conductive member may be respectively provided with a score.
  • the score 1205 on the body portion can be pulled down by the first air pressure in the outer casing, the score on the flip member is sufficient to be pulled down by the second air pressure in the outer casing, and the second air pressure is greater than the first air pressure. That is, the strength of the score of the body portion of the conductive member is smaller than the strength of the score on the flip member to be able to be broken by the smaller first air pressure. Only when the air pressure continues to rise, continue to pull off the nick on the flipper and relieve pressure.
  • the outer periphery of the inverting member 1202 is sealingly connected with the conductive member 1201 to prevent gas from leaking from the outer periphery of the inverting member to release pressure.
  • the cover plate 1102 is provided with a vent hole in gas communication with the inside of the outer casing, and the cover plate is sealedly connected with a first ceramic ring 1207 surrounding the vent hole, and the body portion 1299 is sealingly connected to the first ceramic ring 1207, thereby The internal air pressure can be caused to act on the body portion 12299 without leaking.
  • the outer peripheral edge of the flip member 1202 is sealingly coupled to the second ceramic ring 1296, and the second ceramic ring is sealingly coupled to the conductive member 1201. Therefore, by the insulating property of the second ceramic ring, both the outer periphery of the flip member 1202 can be stably supported, and the outer periphery of the conductive member and the flip member 1202 can be insulated by the second ceramic ring 1296, so that the flip member 1202 and the conductive member are 1201 can maintain the disconnection current connection after being broken by the nick 1205, thereby interrupting the current.
  • the body portion 1299 of the conductive member 1201 is formed with an annular boss 1297 surrounding the score 1205, such that the structure of the annular boss 1297 is radially inward. It can be used to form features such as the score 1205, and the back recess of the annular boss 1297 can be sealed to accommodate the first ceramic ring 1207. In addition, the outer side of the annular boss 1297 can be used for sealingly supporting the second ceramic. Ring 1296.
  • the unique structure of the conductive member described in FIGS. 16 and 17 enables a more convenient mounting of the current interrupting device 1200.
  • first ceramic ring 1207 is sealingly connected to the cover plate 1102 by a transition ring 1209 having a connecting body embedded in the inner wall of the vent hole and a flange ring for connecting the first ceramic ring 1207 as shown in FIG. .
  • the flange ring projects radially from the connecting body and fits over the cover. This ensures a stable installation of the current interrupting device 1200 without the need for the first ceramic ring 1207 to be directly connected to the cover 1102.
  • the electrode terminal 1101 in order to facilitate the connection, preferably, as shown in FIG. 17, the electrode terminal 1101 includes a pole 1104 that passes through the cap plate 1102 and is electrically connected to the cell. As shown in FIGS. 14 and 16, the connecting portion 1298 of the conductive member 1201 is formed with a slot 1295 through which the post 1104 is inserted and welded to each other to achieve a stable connection therebetween.
  • the current interrupting device 1200 includes a connector 1210 overlying the flip member 1202 and electrically connected to the flip member 1202, the connector member 1210 having a cover portion 1294 covering the flip member 1202 and from the cover portion 1294 extends out of the lead portion 1293.
  • the connecting member 1210 can be formed in the same structure as the L-shaped connecting member 214 in the embodiment according to FIGS. 1 to 12, that is, the covering portion and the lead portion are formed as an L-shaped connecting member. Thereby, it is convenient to draw current from the current interrupting device 1200 to the outside of the adjacent electrode terminal or module.
  • the current interrupting device extends the cover plate in the radial direction, thereby increasing the force receiving area and increasing the breaking force. Between adjacent cells, the current interrupting device and the adjacent electrode terminals are offset from each other in the direction in which the cover plate 1102 extends, thereby avoiding interference with the structure on the adjacent cover plates. Also in the same manner as the embodiment according to FIGS. 1 to 12, the number of unit cells 1100 provided with the current interrupting device 1200 is not more than three.
  • a unit cell 2100 according to an embodiment of the present invention is described below with reference to FIG. 18, comprising a housing, a battery core housed in the housing, an electrode terminal 2101 electrically connected to the battery core, and a cover plate 2102 for encapsulating the housing, the electrode The terminal 2101 is disposed on the cover plate 2102, wherein the unit cell includes a first electrode lead-out member 2298 electrically connected to the battery core, and a second electrode lead-out member 2297 electrically connected to the electrode terminal 2101, and the cover plate 2102 is further provided with An explosion-proof valve 2200 is connected to the inside of the outer casing, and the explosion-proof valve 2200 has a reversing member 2202 that connects the first electrode lead-out member 2298 and the second electrode lead-out member 2297, that is, the two electrode lead-out members are connected by the flip member 2202.
  • the first electrode lead-out member 2298 and/or the second electrode lead-out member 2297 are formed with a first score 2205, which can be broken under the air pressure in the outer casing to interrupt the first electrode lead-out member 2298. And/or the current on the second electrode lead-out member 2297, that is, the effect of the first score is to cause the electrode lead-out member provided there to be broken to interrupt the transfer of current, so that at least one of the two electrode lead-out members is provided with A nick can achieve the disconnection of the electrical connection between the cell and the electrode terminal, which in turn causes the cell to be disconnected from the outside.
  • the flip member 2202 is further provided with a second score 2299, which can be broken under the air pressure in the outer casing to allow the gas in the outer casing to leak out through the flip member 2202, that is, the second moment.
  • the role of the mark is to ventilate, and after the disconnection, the internal gas can be leaked, thereby preventing the internal pressure of the battery from continuing to rise and causing an explosion to play an explosion-proof role.
  • the first score can be pulled down by the first air pressure in the outer casing
  • the second score can be pulled down by the action of the second air pressure in the outer casing
  • the second air pressure is greater than the first air pressure. That is, the intensity of the first score 2205 is less than the first
  • Two scores of 2299 are scored to be able to be broken by the smaller first air pressure. Only when the air pressure continues to rise continues to pull off the second score 2299 and relieve pressure.
  • the two electrode lead members may be in a long piece structure, so that in order to be able to break the current, the first notch 2205 extends from one side edge to the other along the width direction of the long piece structure. One side edge, which allows the long piece structure to break along the first score in a more timely manner.
  • the flip member 2202 may be formed with an annular outer wall, and the two electrode lead members may be fixedly connected to the annular outer outer wall to achieve current transfer.
  • the annular outer wall of the inverting member may be formed by, for example, a boss in the boss welding structure, and the inverting member is further formed with a taper ring structure that extends obliquely outward from the boss to the flip The outer periphery of the piece to form a flip-shaped member in the shape of a bowl.
  • the second indentation may be formed in a ring structure around the circumferential direction of the inverting member to completely break under the action of air pressure, thereby increasing the gas pressure relief efficiency.
  • a second score can be formed on the cone ring structure.
  • the outer peripheral edge of the inverting member 2202 is relatively fixedly insulated from the cover plate, so as to avoid the gas from being pulled off. In the case of a nick and a second nick, the two nicks are rendered ineffective. On the other hand, the cover can be prevented from being charged by an insulated connection.
  • the electrode terminal 2101 includes a pole that passes through the cover plate, and the pole is insulated from the outside of the cover plate by a second ceramic ring to facilitate establishing a current loop with the outside. That is, current transfer between adjacent cells is achieved by interconnection of the electrode terminals.
  • the ceramic ring can prevent the cover from being charged.
  • the first ceramic ring 2207 is sealingly connected between the outer periphery of the flip member 2202 and the cover plate, and also functions as a seal and insulation.
  • the cover plate 2102 is fixedly connected with a first transition piece 2295, and the outer periphery of the flip member 2202 is fixedly connected with a second transition piece 2296.
  • the first transition piece and the second transition piece may be aluminum pieces.
  • the first transition piece 2295 and the second transition piece 2296 are brazed coaxially with the first ceramic ring 2207. In this way, when assembling, the two transition sheets can be first brazed to the first ceramic ring, and then the two fixing pieces are welded to other structures, thereby avoiding the first ceramic ring and the cover plate, etc.
  • the high temperature and the like generated by brazing between the structures facilitates assembly and achieves a sealed, stable, and insulated connection through the first ceramic ring 2207, and can prevent the cover 2102 from being charged.
  • first transition piece 2295 and the second transition piece 2296 may each have an annular structure to accommodate the two annular end faces of the first ceramic ring.
  • the cover plate 2102 is formed with an annular boss, and the first transition piece 2295 is supported on the annular boss, and the first ceramic ring abuts against the inner wall of the annular boss toward the second transition piece 2296. The first ceramic ring is thereby stably connected within the cover 2102.
  • the explosion-proof valve further includes a protective film 2099 that can be broken by air pressure, and the protective film seals over the flip member 2202, specifically, the first transition piece 2295 that is remote from the flip member.
  • the protective film 2099 can normally protect the inside of the explosion-proof valve 2200, and when explosion-proof is required, it can be broken by a certain air pressure, for example, the second air pressure, thereby avoiding the explosion-proof effect of the explosion-proof valve.
  • the ratio of the residual thickness of the first score to the residual thickness of the second score is 1:3-1:1.2. Further, it is 1:2-1:1.3.
  • This embodiment provides a single cell 3100 and a battery module using the same.
  • Single cell The 3100 includes a housing, a battery core housed in the housing, a cover plate 3102 of the package housing, and an electrode terminal 3101 disposed on the cover plate 3102.
  • the unit battery 3100 further includes an inner lead-out member 3299 electrically connected to the battery core.
  • a current interrupting device 3200 connected between the inner lead-out member 3299 and the electrode terminal 3101, wherein the current interrupting device in the embodiment is different from the manner in which the outer end is mounted on the pole in the embodiment according to FIGS.
  • the electrode terminal 3101 is connected with an adapter 3298 extending radially outward from the outer periphery to The outer periphery of the current interrupting device is connected by the adapter 3298.
  • the current interrupting device connected to the radially outer side of the adapter member 3298 can be designed in such a manner as to be directly connected to the electrode terminal.
  • increasing the adapter and increasing the size of the current interrupting device are advantageous for the transmission of a large current.
  • the adapter 3298 is formed in an annular structure, the inner circumference of the annular structure is connected to the outer circumference of the electrode terminal, and the outer circumference is connected to the outer circumference of the current interrupting device, thereby increasing the area of the current interruption device.
  • the adapter 3298 can also be a structure of a plurality of connecting posts extending in the radial direction and spaced apart in the circumferential direction, and can also achieve the effect of increasing the area of the current interrupting device.
  • the inner circumference of the annular structure cooperates with the outer peripheral end of the inner end of the electrode terminal.
  • a stopper may be formed on the outer periphery of the inner end of the electrode terminal, and the inner circumference of the adapter is embedded in the opening and connected, thereby increasing the connection area and increasing the current transfer efficiency while ensuring the connection stability.
  • the inner and outer ends of the electrode terminal are defined in the axial direction thereof with respect to the outer casing, that is, the inner end is close to the inner portion of the outer casing.
  • the outer periphery of the annular structure protrudes toward the inside of the outer casing, that is, the annular structure itself is formed into a ring cap structure, and the current interrupting device is engaged with the inner end opening of the outer peripheral edge, thereby Not only does the connection ensure a stable increase in current transfer efficiency but also the current interrupting device and the electrode terminals can be spaced apart, thereby providing space for the current interrupting device to be disconnected under the action of air pressure.
  • the inner lead-out member 3299 includes a connecting piece (not shown) connected to the battery core, the connecting piece extending from the battery core toward the cover plate.
  • the inner lead-out member further includes a support groove for accommodating the installation current interrupting device, and a connecting plate extending from the support groove toward the opposite direction, and the connecting plate is respectively insulated from the cover plate, thereby preventing the cover plate from being charged, in particular, the connecting plate
  • the connecting groove can be formed as an integral sheet structure, that is, the connecting groove comprises two side walls and a bottom wall, and the two side walls are respectively connected with the connecting plates on both sides.
  • the bottom wall of the supporting groove may be formed with an air vent formed in gas communication with the inside of the casing.
  • the inner lead-out member 3299 is insulatively connected to the inner side of the cover plate 3102 by the ceramic member 3296.
  • the ceramic member 3296 can be formed as a ceramic piece, and is respectively welded to the inner lead-out member 3299 and the cover plate through the transition piece 3294, that is, the transition piece 3294 is two pieces, and the transition piece can be an aluminum piece, respectively located on the ceramic piece 3296.
  • the upper and lower surfaces of the ceramic member 3296 are passed through a transition piece 3294 located on the upper surface of the ceramic member 3296.
  • the cover plate 3102 is welded and connected, and the ceramic member 3296 is also welded to the inner lead-out member 3299 through the transition piece 3294 located on the lower surface of the ceramic member 3296, thereby making the welded connection between the ceramic member 3296 and the cover plate 3102 and the inner lead-out member 3299 easier.
  • Realized and the welded structure is stable.
  • the ceramic piece 3296 and the transition piece 3294 located on the upper and lower surfaces thereof may be connected by ceramic brazing.
  • the transition piece 3294 located on the upper surface of the ceramic part 3296 and the cover plate 3102 may be connected by laser welding on the lower surface of the ceramic part 3296.
  • the transition piece 3294 and the inner lead piece 3299 can be connected by laser welding.
  • the current interrupting device 3200 has a conductive member 3201 and a flip member 3202 connected to the conductive member 3201 to be electrically connected to each other, and the flip member 3202 and the conductive member 3201 can be electrically disconnected under the action of air pressure, wherein the conductive member is electrically conductive.
  • the member 3201 is connected to the inner lead-out member 3299 and formed with an air guiding hole 3213 in gas communication with the inner portion of the outer casing.
  • the conductive member 3201 is embedded in the supporting groove of the inner lead-out member, so that the through-air hole formed in the supporting groove can be guided.
  • the air holes 3213 are in gas communication such that the inverting member 3202 can sense the internal gas of the outer casing to open the electrical connection of the inverting member 3202 and the conductive member 3201 under the action of the internal air pressure.
  • the outer circumference of the flip member 3202 is connected to the outer circumference of the adapter 3298 to establish a current connection path.
  • the conductive member 3201 is formed with a score which is disposed around a connection point for connecting the flip member 3202.
  • the score is broken to break the electrical connection between the conductive member and the flip member.
  • the scores may also be formed on the flip member or in a manner that pulls off the joint points.
  • the outer periphery of the flip member 3202 is supported and connected to the conductive member 3201 and/or the inner lead member 3299 via the insulating member 3295, so that the assembly of the flip member 3202 is realized by the insulating member 3295, so that It can be ensured that the outer peripheral edge of the flip member is insulated from the inner lead-out member 3299 and the conductive member, thereby preventing the flip member from being electrically connected to the conductive member or the inner lead member at the outer peripheral edge after being electrically disconnected from the conductive member under the action of air pressure.
  • the insulating member may be an annular insulating member such as a ceramic ring or a sealing ring, wherein the insulating member has three connection manners, and the first is sealed and supported on the conductive member 3201, specifically, the supporting member is pulled around the conductive member 3201. The second region is supported on the inner lead-out member 3299, and the third member is supported on the inner lead-out member 3299 and the conductive member 3201. As shown in Fig. 23, the insulating member is supported on the joint region of the inner lead member 3299 and the conductive member 3201.
  • the flip member 3202 and the conductive member 3201 are connected by a boss soldering structure surrounded by a notch 3205, the boss soldering structure including a boss 3203, a connecting hole 3204 accommodating the boss 3203, and a connection at the boss 3203
  • the annular solder joints 3217 between the holes 3204 ensure efficient passage of large currents.
  • FIG. 23 unlike the one shown in FIG.
  • the boss 3203 is formed on the flip member 3202, and the connection hole 3204 is formed on the conductive member 3201. Further, as in Fig. 6, the boss may be formed on the conductive member 3201, and the connecting hole 3204 may be formed on the flip member.
  • the conductive member 3201 may be formed as a cap-like structure including a cap body connected to the flip member and a cap surrounding the cap body, wherein the cap hole is formed with the air guiding hole and is led out The pieces are connected, and the cap protrudes toward the flipper, the flipper is formed into a sheet-like structure, and the outer periphery of the sheet-like structure is between the cap and the cap
  • the above insulating member 3295 is connected. Therefore, the current interrupting device provided by the present invention has a compact structure and stable assembly.
  • the electrode terminal 3101 in order to establish a current loop with the outside world, preferably, the electrode terminal 3101 includes a pole 3104 passing through the cover plate, and the pole is insulated from the cover plate through the ceramic ring 3293, thereby avoiding charging of the cover plate.
  • a connector 3298 is coupled to the inner end of the pole to establish a current loop with the outside of the cover.
  • the ceramic ring 3293 is sealingly attached to the outer surface of the cover plate and is sealingly connected to the pole 3104 to ensure a sealing effect inside the cover.
  • the air hole 3292 is formed in the axial direction through the pole.
  • the pressure of the closed cavity in the cover plate is not affected, but the pressure difference can be established with the outside atmosphere, so that the flip member 3202 can be operated under the action of the internal and external pressure difference. And the nick is broken 3205.
  • the embodiment provides a unit battery 4100 and a battery module using the same, wherein the unit battery 4100 includes a housing, a battery core housed in the housing, an electrode terminal 4101 electrically connected to the battery core, and a package a cover plate 4102 of the outer casing, the electrode terminal 4101 is disposed on the cover plate 4102, wherein the electrode terminal includes a pole 4104 that passes through the cover plate 4102 and is electrically connected to the battery core through the inner lead-out member 4196, and the single battery further includes a pole mounted
  • the current interrupting device 4200 on the column 4104 has a flip member 4202 fixed relative to the cover plate 4102 and in gas communication with the interior of the housing, and the flip member 4202 is connected to the outer end surface of the pole 4104 by a connection point.
  • the connection point can be disconnected under the action of air pressure.
  • the current interruption device of the present embodiment operates on the principle that the connection point between the flip member 4202 and the pole 4104 is directly pulled by the air pressure, thereby interrupting the electrical
  • the flip member 4202 is connected to the pole by a single pad 4199.
  • the solder joint 4199 which is completed by spot welding can also be realized by other welding means such as laser welding. Therefore, in the present embodiment, the control of the breaking pressure can be realized by rationally implementing the penetration and the melting width of the solder joint.
  • the pole 4104 is formed with an air guiding hole 4103 communicating with the inside of the outer casing, so that the internal air pressure can be easily guided to the current interrupting device.
  • the flip member 4202 is formed with a score 4205 which is disposed around the connection point.
  • the interruption of the current can be achieved by breaking the score 4205.
  • the connection point and the squeezing pull-off gas pressure are different.
  • connection point can be pulled down by the first air pressure in the outer casing, and the nick 4205 can be pulled down by the action of the second air pressure, the second air pressure. Greater than the first air pressure.
  • the score 4205 can be used as a backup measure of the connection point to ensure the safety of the battery.
  • the flip member 4202 is covered with a cap 4210 having a vent 4197 formed therein.
  • the first ceramic ring 4207 is connected between the pole 4104 and the cover 4102, so that the stable mounting of the poles is achieved by the ceramic structure and at the same time the cover 4102 is prevented from being charged.
  • a second ceramic ring 4198 is sealingly connected between the pole 4104 and the outer periphery of the flip member, so that the outer periphery of the flip member can be sealed by the ceramic structure, thereby ensuring that the inner gas can effectively press the flip member, and at the same time Ensure that the poles and the outer periphery of the flipper are insulated from each other, so that the flipper after the joint or the score is broken can still conduct electricity.
  • the pole 4104 has an annular boss 4297 surrounding the connection point, and the back recess of the annular boss 4297 is sealed to receive the first ceramic ring 4207, and the first ceramic ring 4207 is sealedly connected
  • the radially outer side of the annular boss 4297 is sealingly supported by a second ceramic ring 4198 that seals the outer periphery of the support flip member 4202.
  • the structure of the overall current interrupting device is made more compact and the assembly is stable.
  • the first ceramic ring 4207 is sealingly attached to the cover 4102 by a transition ring 4209. Specifically, it can be hermetically connected by ceramic brazing of the transition ring and the first ceramic ring 4207.
  • the embodiment provides a unit cell including a housing 109, a battery core 108 housed in the housing 109, an electrode terminal 101 electrically connected to the battery core 108, and a cover plate 102 enclosing the housing, the electrode terminal The 101 is disposed on the cover plate 102.
  • the electrode terminal includes a pole 105"' that passes through the cover plate 102 and is electrically connected to the battery core.
  • the unit battery further includes a current interrupting device 200 mounted on the pole 104"'.
  • the interrupting device 200 is in gas communication with the inside of the casing, wherein the current interrupting device 200 has a conductive member 201 and a flip member 202 connected to the conductive member 201 to be electrically connected to each other, and the flip member 202 and the conductive member 201 can be disconnected under the action of air pressure.
  • the boss soldering structure includes a boss 203, and the boss 203 is accommodated
  • the connecting hole 204 and the annular solder joint 217 between the boss 203 and the connecting hole 204, the inverting member 202 is formed as a first sheet-like structure, and the first sheet-like structure is formed with a connecting hole 204, and the conductive member 201 is formed as Second piece
  • the second sheet-like structure is formed with a boss 203.
  • the conductive member 201 is formed with a notch 205.
  • the score 205 is disposed around the boss 203, and the conductive member 201 is connected to the outer end surface of the pole 104"'.
  • the outer periphery of the flip member 202 is fixed relative to the cover plate 102, the pole post 104"' is fixedly coupled to the cover plate 102, and the pole post 104"' is formed with an air guiding passage communicating with the inside of the outer casing and the current interrupting device 200.
  • the column 104"' is mounted on the ceramic ring 207" sealingly connected to the cover plate 102.
  • the outer end surface of the ceramic ring 207" is sealingly connected with a conductive ring 216'.
  • the outer periphery of the flip member 202 is sealingly connected to the conductive ring 216'.
  • the upper post 104"' is insulated from the conductive ring 216' by a ceramic ring 207", thereby stably completing the transfer and interruption of current.
  • the outer end surface of the pole post 104"' is formed with a receiving hole 218', and the outer peripheral edge of the conductive member 201 is fixed to the inner wall of the receiving hole.
  • the score 205 is elliptical
  • the boss 203 is circular
  • the center of the score 205 and the center of the boss 203 are staggered along the long axis direction of the ellipse
  • the long axis and the electrode of the ellipse The axis of the terminal is tilted.
  • the inner edge of the ceramic ring 207" has a radial support 208" that supports the radial boss 105
  • radial The bosses 105" are a plurality of circumferentially spaced apart ones
  • the radial supports 208" are a plurality of circumferentially spaced apart ones
  • the plurality of radial bosses and the plurality of radial supports are in one-to-one correspondence.
  • the outer end surface of the ceramic ring 207' is formed as a stepped structure having an inner ring and an outer ring, the pole post 104"' is embedded in the inner ring, and the outer ring is sealed and connected with a conductive ring insulated from the pole.
  • the outer periphery of the flip member 202 is fixedly connected to the conductive ring 216 ′, and the inner end surface of the ceramic ring 207 ′′ is sealingly connected with a transition ring 209 ′, and the transition ring 209 ′ is sealingly connected to the cover plate 102 to make the ceramic
  • the ring 207" is spaced from the cover plate 102.
  • the ceramic rings 207" are respectively sealed to the conductive ring 216', the poles 104"' and the transition ring 209' by ceramic brazing.
  • the transition ring 209' has an inner ring and an outer ring forming a Z-shaped structure, and the cover plate is formed with a through hole through which the pole 105 passes.
  • the end face of the through hole is a stepped structure, and the inner ring of the transition ring
  • the embedded support is in the step structure.
  • the outer end surface of the conductive ring 216' is formed with an L-shaped opening
  • the outer periphery of the flip member 202 is embedded and supported in the L-shaped opening
  • the outer periphery is sealed by the cap 210 covering the flip member 202. Connected to the L-shaped stop.
  • the battery core 108 is connected with a lower spacer 107, and the upper spacer 106 is connected below the cover 102, and the upper and lower spacers can be made of an insulating material.
  • the unit cell 100 further includes an inner connecting piece 110 connected to the battery core.
  • the inner connecting piece 110 extends between the upper spacer 107 and the lower spacer 106.
  • the lower surface of the pole 104"' is formed.
  • the battery module includes a plurality of single cells, at least one of the single cells is the single cell, and the current interrupting device 200 extends radially outward from the cover 102, adjacent to each other. Between the unit cells 100, the current interrupting device 200 is offset from the adjacent electrode terminals in the extending direction of the cover. In addition, as shown in FIG. 1, between the adjacent unit cells 100, the current interrupting device 200 and the adjacent electrode terminals are connected by an L-shaped connecting member 214 having a covering portion 211 and The lead portion 212 is covered and connected to the current interrupting device 200, and the lead portion 212 extends to the adjacent electrode terminal.
  • the embodiment further provides a power battery, comprising: a package body and a battery module housed in the package body; the battery module is the battery module, and the package body is provided for detecting A gas detecting device for combustible gas, the gas detecting device being disposed adjacent to the current interrupting device for providing a combustible gas signal for the charge and discharge protection system.
  • the battery module has a current interrupting device.
  • the above describes a single cell with a current interrupting device or an explosion-proof valve, in which the current interrupting device or the explosion-proof valve is a safety measure achieved by its own mechanical structure.
  • the present invention will detail a power battery including a charge and discharge protection system to improve safety by electronic control.
  • the present invention provides a power battery which may be the above-described power interrupting device, explosion-proof valve or other type of power battery.
  • the power battery includes a package body and a plurality of unit cells 100 housed in the package body, wherein the plurality of unit cells 100 form a battery module, for example, in series or in parallel, wherein the package body is provided for detecting
  • the charging and discharging protection system included in the power battery includes a control device 400 and a circuit switching device in addition to the gas detecting device 300 located in the power battery.
  • the gas detecting device 300 feeds back the combustible gas signal to the control device 400, and the control device 400 is configured to cut off the charging and discharging circuit of the power battery according to the combustible gas signal control circuit switching device. That is, the security of the present invention Sex is an automatic control by detecting the presence or absence of a combustible gas in the bag. Among them, in the dangerous state in which the battery is overcharged, a combustible gas is generated inside, and this part of the gas may leak into the bag body more or less in various ways, and at this time, the gas detecting device, such as the gas sensor, can detect the combustible gas.
  • the gas is fed back to the control device, and the control device determines whether to cut off the charge and discharge circuit of the power battery based on whether the combustible gas or the amount of the combustible gas detected is detected.
  • the circuit switching device can be controlled to cut off the charging and discharging circuit of the power battery to ensure the safety of the power battery.
  • the power battery further includes an alarm device 500 controlled by the control device 400, so that an alarm device such as a voice, a flashing light, a siren, etc. can be used to prompt the relevant personnel to evacuate the site, thereby reducing the safety hazard.
  • an alarm device such as a voice, a flashing light, a siren, etc.
  • the control device 400 includes a host computer main control chip 401 of a power battery and a control module 402 connected to the main control chip signal.
  • the control module 402 is connected to the circuit switching device signal.
  • the circuit switching device may be a relay 403 located in the charging and discharging circuit to be controlled by the control module 402 to cut off the charging and discharging circuit.
  • the alarm device 500 may directly connect with the upper computer control chip 401 to receive an alarm command alarm.
  • the collected signals of the gas sensor can be processed by digital-to-analog conversion, sampling and saving, etc.
  • the fault diagnosis of the system can be performed.
  • the collected signal can be further subjected to gas concentration.
  • the process determines whether a leakage of combustible gas has occurred.
  • the host computer main control chip 401 performs an operation of cutting off the current and the alarm.
  • the gas detecting device is disposed outside the single cell, and the combustible gas can be discharged through the current interrupting device or the explosion-proof valve in the above embodiments of the present invention, and the gas can be passed through as long as the gas can be discharged.
  • Various conventional explosion-proof valves known to those skilled in the art are vented. That is, in the battery module, at least one of the unit cells is provided with a current interrupting means for cutting off the charge and discharge circuit under the action of the gas pressure inside the unit cell, that is, the respective current interrupting means. And the current interrupting device can allow the gas in the outer casing to be leaked in the cut-off state.
  • the gas detecting device in the bag body can detect the leaked combustible gas, and at this time, it indicates that the battery has a dangerous situation such as overcharging.
  • the gas detecting means is disposed adjacent to the current interrupting means, so that the corresponding signal can be detected in time and fed back to the control means after the flammable gas is released.
  • at least one of the single cells is provided with an explosion-proof valve capable of venting gas under the gas pressure inside the single cell, such as the explosion-proof valve according to the embodiment of FIG. At this time, the gas detecting device may be disposed adjacent to the explosion-proof valve.
  • the current interrupting device in each of the above embodiments has a cover member on which a gas hole communicating with the outside is formed.
  • the gas in the outer casing can be made to be discharged after the flip member and the conductive member are electrically disconnected and then passed through the flip member.
  • the flip member may be provided with a score which can be broken by the internal air pressure of the outer casing.
  • the degree of withstand voltage of the score on the flip member may be greater than the score strength of the body portion of the conductive member, or according to the embodiment of FIG.
  • the resistance of the score on the flip member The degree of pressure can be greater than the intensity of the score on the two electrode lead-outs, thereby achieving a process of first breaking the current and then releasing the gas. Furthermore, the above-described score is machined on the flip member as in the case of the current interrupting device according to the embodiment of Figs.
  • the air holes on the cover member can also cause the current interrupting device to directly establish a pressure difference with the atmosphere, thereby realizing the turning The action of the transfer.
  • the cover member here may be the cap 210 according to the embodiment of FIGS. 1 to 12, or may be the connector 1210 according to the embodiment of FIGS. 13-17, or the protection according to the embodiment of FIG. Membrane 2099 and the like.
  • the gas can be made to escape by, for example, the air holes 213 according to the embodiment of Figs. 1 to 12, thereby detecting the combustible gas leaking into the bag in time by the gas detecting means.
  • the development of new energy vehicles has become the country's new strategic plan, and the hybrid or pure electric vehicles in the new energy vehicles occupy the mainstream in the current automotive market.
  • the cruising range is currently It is the main factor restricting development, and it depends on the energy density of the battery.
  • the main battery materials in the market are two camps of ternary and lithium iron phosphate.
  • the former has high energy density, but the safety performance is poor, especially overcharge. It can cause a fire and explosion, which is a big challenge for the automotive industry where safety performance is critical.
  • the existing battery pack design basically controls the voltage and current temperature of the battery cells in the module through the BMS (Battery Management System), but in the actual use process, the consistency and management software of the battery core.
  • BMS Battery Management System
  • the general public may also have a situation in which the vehicle body is plugged into a power source and charged all the time.
  • BMS software for control, the single battery is charged for a long time, if the software detects Failure or other anomalies can create a risk of overcharging of the cells in the package loop.
  • a mechanical protection design can be designed for the battery to avoid battery safety risks caused by software failure.
  • the inventors of the present invention have creatively found that the current interruption timing of the battery in a dangerous state such as overcharging is actually regular, that is, the internal pressure can be utilized when a dangerous state such as overcharging occurs.
  • the power battery capacity used in automobiles is generally ten times that of the 3C battery type, and the current is even tens or even hundreds of times smaller than the battery type, it is required that the film must pass a large current, and Due to the use environment, the weather resistance and sealing requirements are more stringent, and these problems are brought together to form the technical solutions of the above various embodiments of the present invention.
  • the current interrupt device or the explosion-proof valve can disconnect the battery current in time, thus improving safety.

Abstract

L'invention concerne une batterie à élément unique, un module de batterie, une batterie d'alimentation et un véhicule électrique. La batterie à élément unique comprend un boîtier, un élément de batterie logé dans le boîtier, une borne d'électrode électriquement connectée à l'élément de batterie, et une plaque de recouvrement scellant le boîtier. La borne d'électrode est disposée sur la plaque de recouvrement. La batterie à élément unique comprend un premier élément de sortie d'électrode électriquement connecté à l'élément de batterie, et un second élément de sortie d'électrode électriquement connecté à la borne d'électrode. La plaque de recouvrement est en outre pourvue d'une soupape antidéflagrante en communication avec le gaz présent dans le boîtier. La soupape antidéflagrante comprend un élément de renversement qui connecte le premier élément de sortie d'électrode et le second élément de sortie d'électrode. Une première encoche est formée sur le premier élément de sortie d'électrode et/ou le second élément de sortie d'électrode. La première encoche peut être découpée ouverte sous l'effet de la pression de gaz dans le boîtier pour couper un courant sur le premier élément de sortie d'électrode et/ou le second élément de sortie d'électrode. Une seconde encoche est formée sur l'élément de retournement. La seconde encoche peut être découpée ouverte sous l'effet de la pression de gaz dans le boîtier de telle sorte que le gaz dans le boîtier est déchargé à travers l'élément de renversement.
PCT/CN2016/097404 2016-02-25 2016-08-30 Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique WO2017143752A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201610104654.8A CN107123778B (zh) 2016-02-25 2016-02-25 单体电池、电池模组、动力电池及电动汽车
CN201610104654.8 2016-02-25
CN201620143107.6 2016-02-25
CN201620143107.6U CN205621794U (zh) 2016-02-25 2016-02-25 单体电池、电池模组、动力电池及电动汽车

Publications (1)

Publication Number Publication Date
WO2017143752A1 true WO2017143752A1 (fr) 2017-08-31

Family

ID=59684718

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2016/097404 WO2017143752A1 (fr) 2016-02-25 2016-08-30 Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique

Country Status (1)

Country Link
WO (1) WO2017143752A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107486641A (zh) * 2017-09-20 2017-12-19 安徽航大智能科技有限公司 一种新能源电池模组辅助夹紧焊接车
CN108428836A (zh) * 2018-01-09 2018-08-21 宁德时代新能源科技股份有限公司 二次电池顶盖用防爆阀、顶盖组件、二次电池及汽车
CN113320402A (zh) * 2020-02-28 2021-08-31 比亚迪股份有限公司 电池包及电动车
CN113725530A (zh) * 2017-11-03 2021-11-30 宁德时代新能源科技股份有限公司 动力电池顶盖组件、动力电池以及电池模组
CN114221072A (zh) * 2019-01-09 2022-03-22 比亚迪股份有限公司 无模组框架的电池包、车辆和储能装置
CN114335921A (zh) * 2021-12-31 2022-04-12 江西百思利新能源科技股份有限公司 圆柱形电池正极端盖及其圆柱形电池
CN114374030A (zh) * 2022-02-10 2022-04-19 中创新航科技股份有限公司 电池、电池组及电池的制备方法
CN114788082A (zh) * 2020-07-10 2022-07-22 宁德时代新能源科技股份有限公司 泄压机构、电池盒、电池单体、电池、制备方法和装置
CN114865184A (zh) * 2022-03-29 2022-08-05 联动天翼新能源有限公司 电池盖板翻转入壳装置和翻转设备
CN115621676A (zh) * 2022-12-19 2023-01-17 比亚迪股份有限公司 复合极柱、端板组件、电池和车辆

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201508864U (zh) * 2009-09-10 2010-06-16 比亚迪股份有限公司 一种电池盖板组件、单体电池及电池组
CN201623187U (zh) * 2010-04-14 2010-11-03 宁德新能源科技有限公司 电池组合盖帽

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201508864U (zh) * 2009-09-10 2010-06-16 比亚迪股份有限公司 一种电池盖板组件、单体电池及电池组
CN201623187U (zh) * 2010-04-14 2010-11-03 宁德新能源科技有限公司 电池组合盖帽

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107486641A (zh) * 2017-09-20 2017-12-19 安徽航大智能科技有限公司 一种新能源电池模组辅助夹紧焊接车
CN107486641B (zh) * 2017-09-20 2023-06-16 安徽航大智能科技有限公司 一种新能源电池模组辅助夹紧焊接车
CN113725530A (zh) * 2017-11-03 2021-11-30 宁德时代新能源科技股份有限公司 动力电池顶盖组件、动力电池以及电池模组
CN113725530B (zh) * 2017-11-03 2024-02-23 宁德时代新能源科技股份有限公司 动力电池顶盖组件、动力电池以及电池模组
CN108428836A (zh) * 2018-01-09 2018-08-21 宁德时代新能源科技股份有限公司 二次电池顶盖用防爆阀、顶盖组件、二次电池及汽车
CN114512758A (zh) * 2019-01-09 2022-05-17 比亚迪股份有限公司 单体电池、动力电池包及电动车
CN114221072A (zh) * 2019-01-09 2022-03-22 比亚迪股份有限公司 无模组框架的电池包、车辆和储能装置
CN114512760A (zh) * 2019-01-09 2022-05-17 比亚迪股份有限公司 单体电池、动力电池包及电动车
CN115020886B (zh) * 2019-01-09 2024-01-26 比亚迪股份有限公司 单体电池、动力电池包及电动车
CN114512758B (zh) * 2019-01-09 2024-01-30 比亚迪股份有限公司 单体电池、动力电池包及电动车
CN115020886A (zh) * 2019-01-09 2022-09-06 比亚迪股份有限公司 单体电池、动力电池包及电动车
CN114221072B (zh) * 2019-01-09 2024-01-30 比亚迪股份有限公司 无模组框架的电池包、车辆和储能装置
CN114512760B (zh) * 2019-01-09 2024-01-09 比亚迪股份有限公司 单体电池、动力电池包及电动车
CN113320402A (zh) * 2020-02-28 2021-08-31 比亚迪股份有限公司 电池包及电动车
CN114788082A (zh) * 2020-07-10 2022-07-22 宁德时代新能源科技股份有限公司 泄压机构、电池盒、电池单体、电池、制备方法和装置
CN114788082B (zh) * 2020-07-10 2023-12-12 宁德时代新能源科技股份有限公司 泄压机构、电池盒、电池单体、电池、制备方法和装置
CN114335921A (zh) * 2021-12-31 2022-04-12 江西百思利新能源科技股份有限公司 圆柱形电池正极端盖及其圆柱形电池
CN114374030A (zh) * 2022-02-10 2022-04-19 中创新航科技股份有限公司 电池、电池组及电池的制备方法
CN114865184A (zh) * 2022-03-29 2022-08-05 联动天翼新能源有限公司 电池盖板翻转入壳装置和翻转设备
CN115621676A (zh) * 2022-12-19 2023-01-17 比亚迪股份有限公司 复合极柱、端板组件、电池和车辆

Similar Documents

Publication Publication Date Title
WO2017143748A1 (fr) Batterie d'alimentation, son système de protection et véhicule électrique
WO2017143751A1 (fr) Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique
WO2017143752A1 (fr) Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique
WO2017143753A1 (fr) Batterie à élément unique, module de batterie, batterie d'alimentation et véhicule électrique
WO2017143754A1 (fr) Batterie à élément unique, module de batterie, bloc-batterie, et véhicule électrique
CN107123778B (zh) 单体电池、电池模组、动力电池及电动汽车
CN107123756B (zh) 电流中断装置、单体电池、电池模组、动力电池及电动汽车
CN107123768B (zh) 单体电池、电池模组、动力电池及电动汽车
CN205488328U (zh) 单体电池、电池模组、动力电池及电动汽车
WO2017143749A1 (fr) Batterie à cellule unique, module de batterie, batterie d'alimentation et automobile électrique
WO2018177137A1 (fr) Ensemble couvercle de batterie, batterie unicellulaire, module de batterie, bloc-batterie d'alimentation et véhicule électrique
CN107123777B (zh) 单体电池、动力电池及电动汽车
CN107123775B (zh) 单体电池、电池模组、动力电池及电动汽车
CN107123782B (zh) 单体电池、电池模组、动力电池及电动汽车
CN107123784B (zh) 单体电池、电池模组、动力电池及电动汽车
WO2017143750A1 (fr) Batterie à cellule unique, module de batterie, batterie d'alimentation et véhicule électrique
CN205645976U (zh) 单体电池、电池模组、动力电池及电动汽车
CN205645975U (zh) 单体电池、电池模组、动力电池及电动汽车
KR102477392B1 (ko) 배터리 시스템 및 전기 자동차
CN107123780B (zh) 单体电池、电池模组、动力电池及电动汽车
CN107123783B (zh) 单体电池、电池模组、动力电池及电动汽车
CN107123779B (zh) 单体电池、电池模组、动力电池及电动汽车
CN107123781B (zh) 电池模组、动力电池及电动汽车
WO2019114772A1 (fr) Dispositif d'interruption de courant et élément à encoche associé, ensemble plaque de couvercle de batterie, cellule de batterie, module de batterie, batterie d'alimentation et véhicule électrique

Legal Events

Date Code Title Description
NENP Non-entry into the national phase

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16891200

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 16891200

Country of ref document: EP

Kind code of ref document: A1