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WO2009057893A1 - Appareil de protection empêchant la surcharge d'une batterie secondaire - Google Patents

Appareil de protection empêchant la surcharge d'une batterie secondaire Download PDF

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Publication number
WO2009057893A1
WO2009057893A1 PCT/KR2008/005643 KR2008005643W WO2009057893A1 WO 2009057893 A1 WO2009057893 A1 WO 2009057893A1 KR 2008005643 W KR2008005643 W KR 2008005643W WO 2009057893 A1 WO2009057893 A1 WO 2009057893A1
Authority
WO
WIPO (PCT)
Prior art keywords
cut
unit
safeguard apparatus
connection
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2008/005643
Other languages
English (en)
Inventor
Hyosung Lee
Jungsik Yun
Suyoung Chang
Seungjun Lee
Jeonkeun Oh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SK Energy Co Ltd
Original Assignee
SK Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SK Energy Co Ltd filed Critical SK Energy Co Ltd
Publication of WO2009057893A1 publication Critical patent/WO2009057893A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • H01M50/517—Methods for interconnecting adjacent batteries or cells by fixing means, e.g. screws, rivets or bolts
    • 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 a safeguard apparatus preventing overcharge for a secondary battery.
  • a battery can be classified into a primary y) battery incapable of repeating charge/discharge due to an irreversible reaction and a secondary battery capable of repeating charge/discharge due to a reversible reaction.
  • the primary battery includes a dry battery, a mercury battery, a voltaic battery and the like, and the second battery includes
  • the Ni-Cd battery generally includes an anode formed of nickel oxide, a cathode formed of Cd compound, and KOH solution as electrolyte. Since the Ni-Cd battery is light and rechargeable, it is used as a battery of a notebook
  • the lithium-ion battery includes an anode formed of lithium oxide and a cathode formed of carbon. Since the lithium- ion battery can provide electric power having high voltage and high energy density, it can be formed to be smaller and lighter, and also since it is free from the problem of memory effect, it is widely used a rechargeable battery for various portable electronic instruments such as a notebook computer, PDA, and a cellular phone . As described above, the lithium- ion battery has been used
  • the lithium-ion battery generally uses liquid electrolyte.
  • a lithium-ion polymer battery in which a gel-type polymer functions as a
  • separator membrane between an anode and a cathode and also serves as electrolyte. That is, because the lithium-ion polymer battery uses solid electrolyte having excellent conductivity, it is possible to fundamentally remove a risk of leakage and explosion of the conventional liquid electrolyte.
  • a cathode is formed of lithium metal, instead of the carbon.
  • Table 1 the characteristics of the lithium-ion battery, the lithium-ion polymer batter and the lithium metal polymer battery are provided in brief.
  • the lithium- ion polymer battery has good characteristics over the entire fields, and thus it is most widely used.
  • the lithium- ion polymer battery has an unsolved problem in the stability.
  • gas is generated therein, and the battery is swelled due to the generated gas. If the swelling of the battery is continued, a battery pouch may be forcibly opened so as to exhaust the gas, or it may cause the risk of fire or explosion.
  • studies in various fields can be broadly classified into a method of chemically preventing overcharge and a method of electrically preventing overcharge, which are described below.
  • Korean Patent No.0472506 entitled “Rechargeable lithium batteries comprising non-aqueous electrolyte containing polymerizable aromatic additives for overcharge protection”
  • Korean Patent No.0628629 entitled “Non-aqueous electrolyte for secondary battery and secondary battery comprising the electrolyte”
  • Korean Patent Publication No .2006-0121173 entitled “Non-aqueous electrolyte solution and lithium secondary battery” .
  • Korean Patent No.0729106 there are provided an exothermic device for generating heat at a predetermined temperature or more and a temperature sensitive device, and the temperature sensitive device senses the heat generated from the exothermic device and then reversibly turns on and off the current.
  • an exothermic device for generating heat at a predetermined temperature or more and a temperature sensitive device, and the temperature sensitive device senses the heat generated from the exothermic device and then reversibly turns on and off the current.
  • Japanese Patent Publication No.1993-326027 a strain gauge is disposed at one side of the battery so as to detect a change in stress of the battery caused by increase of an internal pressure of the battery resulted from charge of the battery. When the change in stress reaches a predetermined value, the completion of the battery charge is determined so that a control unit finishes the charge.
  • an automatic reset thermal switch or a thermal fuse is connected in series with the battery and a zener diode is connected in parallel with the battery so as to improve the overcharge characteristic.
  • Japanese Patent No.3778805 an additive for generating gas at a predetermined voltage or more by a chemical reaction occurred in the battery- is previously added m the battery, and an opening that is opened by the gas pressure is formed at one side of the battery.
  • an opening is opened so as to exhaust the gas and heat to the outside.
  • Japanese Patent No.3622243 Japanese Patent No.3526766, Japanese Patent Publication No .2007-028898 and Japanese Patent Publication No.2004-088878 , an electric circuit for detecting overcurrent and overvoltage is provided at the battery.
  • an object of the present invention is provide a safeguard apparatus preventing overcharge for a secondary battery, which has a mechanical structure for converting horizontal force into vertical force in the battery and a switch disposed in a vertical direction so that the current is () physically cut off by using the swelling of the battery caused by gas generated upon the overcharge.
  • the present invention provides a safeguard apparatus preventing overcharge for a secondary battery that is comprised of a plurality of cells 10 which are arranged at regular intervals and respectively comprise a cathode 1, an anode 2 and electrolyte 3, wherein the secondary battery is comprised of a connection part 20 which is formed of a conductive material and disposed at an upper side of each cell 10; and a cut-off unit 200 which is formed of a conductive material and contacted with or separated from the connection unit 20 so as to switch on/off electric connection
  • the cells 10 is characterised to have a mechanical operating mechanism and is provided between the adjacent cells 10 of the secondary battery so as to convert horizontal force generated by change in volume of each cell 10 into vertical force .
  • the safeguard apparatus 100 applies the vertical force to the cut-off unit 200, when the volume of the cell 10 is increased, so that the electric connection is cut off.
  • the safeguard apparatus 100a comprises a rod
  • 111 formed with at least one groove 112 at a middle portion thereof; at least a pair of fixing parts 116 that are respectively provided at faced surfaces of adjacent cells 10; at least a pair of bars 113 that are connected with the fixing parts 116 to be engaged in the groove 112 when the cell 10 is in a normal state and to be disengaged from the groove 112 when the cell 10 is in a swelled state; an elastic part 114 that is disposed between a lower end of the rod 111 and a bottom surface of a battery; and a connection stick 115 that connects an upper end of the rod 111 and a cut-off unit 200.
  • the rod 111 and the connection stick 115 is independently manufactured and then assembled, and also integrally formed with each other.
  • the safeguard apparatus 100 returns the cutoff unit 200 to its initial position, when the volume of the cell 10 is reduced, so that the electric connection between the cells is restored.
  • the safeguard apparatus 100b comprises a cam 121 that is formed to be rotated around a fixing shaft 122 and have a long axis and a short axis orthogonal to each other; at least a pair of sliding surfaces 125 that are respectively provided at faced surfaces of adjacent cells 10 and contacted with an external circumferential surface of the cam 121; and a connection stick 123 that is contacted with an upper external circumferential surface of the cam 121, formed with a sliding part 124 formed at a lower end thereof to be rounded, and connected with a cut-off unit 200.
  • the cam 121 has a long axis and a short axis, and one of the long axis and the short axis, which is contacted with the connection stick 123 when the electric connection is cut off, is provided with an additional weight, or the cam 121 has a long axis and a short axis, and one of the long axis and the short axis, which is contacted with the F; connection stick 123 when the electric connection is cut off, is provided with an elastic means for connecting a bottom surface of the battery and the axis.
  • the safeguard apparatus 100c comprises at least a pair of fixing parts 135 that are respectively
  • connection stick 133 that connects a cut-off
  • the safeguard apparatus 100c further comprises an elastic part that connects a bottom surface of the battery and a hinge shaft on which the upper links 131 are hinged to each other.
  • the safeguard apparatus 100c further comprises at least a pair of lower links 132 of which one ends are respectively hinged to the fixing parts 135 and the other ends are hinged to each other so that hinged portions are directed upward or downward; and an elastic part 134 that connects a bottom surface of the battery and a hinge shaft on which the lower links 132 are hinged to each other.
  • the safeguard apparatus 100 moves vertically upward the cut-off unit 200 when the volume of the cell 10 is increased .
  • the safeguard apparatus 100 moves vertically downward the cut-off unit 200 when the volume of the cell 10 is increased.
  • a surface of the cell 10 is formed C) of a material having a low compressive strength, or the cutoff unit 200 is formed of a material having a low flexural strength .
  • connection units 20 Further, a pair of connection units 20 and a cut-off unit
  • cut-off unit 200 is moved vertically upward or downward, or one end of the cut-off unit 200 is connected with one of the connection units 20 and the other end of the cut-off unit 200 is connected with the other connection unit 20 so that one end of the cut-off unit
  • ⁇ ) 200 is contacted with or separated from the connection unit 20 to switch on/off electric connection.
  • the current can be efficiently cut off when the secondary battery is overcharged, it is possible to completely remove the risk of fire, explosion and the like caused by gas and overheat generated upon the overcharge.
  • the current can be facilely cut off using the simple mechanical structure and the swelling of the battery caused by gas generated upon the overcharge, it is possible to improve the reliability of cutting off the current.
  • the mechanical structure has a simple structure converting the horizontal force into the vertical force, it is easy and facile to design and manufacture it, and also the manufacturing cost is not so high.
  • Fig 1 is a schematic view of a structure of a general lithium- ion battery.
  • Fig. 2 is a schematic view of a safeguard apparatus preventing overcharge for a secondary battery according to the present invention.
  • Fig 3 is a view of a safeguard apparatus preventing overcharge for a secondary battery according to a first embodiment of the present invention.
  • Fig. 4 is a view of a safeguard apparatus preventing overcharge for a secondary battery according to a second embodiment of the present invention.
  • Fig. 5 is a view of a safeguard apparatus preventing overcharge for a secondary battery according to a third embodiment of the present invention.
  • cathode 2 anode
  • connection stick 116 fixing part
  • connection stick 124 sliding part
  • connection stick 134 elastic part 135 : fixing part
  • Fig. 1 conceptionally shows a structure of a general lithium- ion battery.
  • the lithium-ion battery has the same structure as a lithium-ion polymer battery, except phase (liquid/solid) of electrolyte. Materials of electrodes and electrolyte may be slightly different from those in Fig. 1 according to batteries.
  • the lithium- ion battery generally includes a cathode (negative electrode) 1 formed of carbon, an anode (positive electrode) 2 formed of a lithium compound, electrolyte 3 interposed between the cathode 1 and the anode 2, and a wire 4 for connecting the cathode 1 and the anode 2.
  • Lithium ions in the electrolyte 3 are moved to the cathode 1 upon charge of the battery and moved to the anode 2 upon discharge of the battery, and a chemical reaction occurs while each electrode emits or absorbs surplus electrons in each electrode. In this process, the electrons are moved through the wire 4 and thus electric energy is generated.
  • the lithium- ion battery may be comprised of the single cathode 1, the single anode 2, the single electrolyte 3 and the single wire 4.
  • the lithium-ion battery is generally comprised of a plurality of cells 10 that respectively include the single cathode 1, anode 2, electrolyte 3 and wire 4 and are connected with each other. That is, the plurality of cells 10 is received in a pack of the lithium-ion battery.
  • Fig. 2 conceptionally shows a safeguard apparatus preventing overcharge for a secondary battery according to the present invention.
  • the battery is comprised of the plurality of cells 10 connected with each other. Therefore, the cells 10 are connected with each other by a connection unit 20.
  • a part of the connection unit 20 is cut out and then a cut-off unit 200 is disposed at a position of the cut-out part of the connection unit 20 so as to be moved up and down.
  • the cut-off unit 200 connects the separated connection units 20, the cells 10 are connected with each other so that the charge and discharge are normally performed.
  • a safeguard apparatus 100 preventing overcharge for a secondary battery according to the present invention is provided between the cells 10. As described above, when the battery is overcharged, the cells 10 are swelled by gas generated in each cell 10. Thus, a volume of each cell 10 is increased, and the safeguard apparatus 100 receives a pressure applied in a horizontal direction by the cells 10 having the increased volume.
  • the safeguard apparatus 100 is a mechanical structure for converting horizontal force into vertical force, and thus the horizontal force applied by the swelling of the cells 10 is converted into the vertical force.
  • the safeguard apparatus 100 since the safeguard apparatus 100 is connected with the cut-off unit 200, the safeguard apparatus 100 pushes up the cut-off unit 200. As the cut-off unit 200 is pushed up, the electrical connection between the separated connection units
  • Fig. 2C is a schematic view of Figs. 2A and 2B, in which
  • connection unit 20 and the cut-off unit 200 are symbolized.
  • the connection unit 20 serves as an electric wire
  • the cut-off unit 200 serves as an electric switch. That is, if the connection unit 20 and the cut-off unit 200 can function as the electric wire and the electric switch, respectively, they may be formed into any shapes .
  • connection unit 20 is formed into a conductive plate, but it is possible that the connection unit 20 is formed into a line and arranged
  • the cut-off unit 200 is fixedly and vertically connected with the safeguard apparatus 100 and completely separated from the connection units 20 (case i) . If the safeguard apparatus 100 applies the vertical force to the cut-off unit 200, the cut-
  • the cut-off unit 200 may be formed into a switch used in a general electric circuit (case ii) .
  • one end of the cut-off unit 200 is hinged to or integrally formed with one of the connection units 20, and the other end of the cut-off unit i 200 is contacted with or separated from the other connection unit 20.
  • the safeguard apparatus 100 may be fixed connected with the cut-off unit 200. But it is preferable that the safeguard apparatus 100 is just contacted with the cut-off unit 200 and slid upward so as to push up the
  • the safeguard apparatus 100 pulls down the cut-off unit 200 to cut off the current.
  • the cut-off unit 200 is completely separated from the connection units 20 (case i)
  • the cut-off unit 200 and the connection unit 20 can have the same structure as the case that the cut-off unit 200 is pushed up, and if the cut-off unit 200 is formed into the switch used m a general electric circuit (case ii) , the cutoff unit 200 is formed to be spread downward when the external force is not applied, or one end of the cut-off unit 200 is hinged to one of the connection units 20.
  • connection unit 20 can serve as the electric wire and the cut-off unit 200 can serve as the electric switch ) that physically turn on/off the current, they may be formed into any shapes.
  • Fig. 3 is a view of a safeguard apparatus preventing overcharge for a secondary battery according to a first embodiment of the present invention, wherein Fig. 3A shows a normal state and Fig. 3B shows an overcharge state.
  • the safeguard apparatus 100a includes a rod 111 formed with at least one groove 112 at a middle portion thereof; at least a pair of fixing parts 116 that are respectively provided at faced surfaces of adjacent cells 10; at least a pair of bars ) 113 that are connected with the fixing parts 116 to be engaged m the groove 112 when the cell 10 is in a normal state and to be disengaged from the groove 112 when the cell 10 is in a swelled state; an elastic part 114 that is disposed between a lower end of the rod 111 and a bottom surface of a battery; ⁇ and a connection stick 115 that connects an upper end of the rod 111 and a cut-off unit 200.
  • a size of a hole formed by the pair of bars 113 is equal to or greater i ) than a size of the groove 112, but smaller than a cross- section area of the rod 111 so that the bar 113 can be engaged in the groove 112.
  • the hole size formed by the pair of bars 113 becomes larger than the cross-sectional area of the rod 111, and thus the rod 111 can be freely moved through the hole formed by the pair of bars 113.
  • the lower end of the rod 111 and the bottom surface of a battery i.e., the bottom surface on which the cells 10 are fixed
  • the elastic part 114 is disposed to be normally in a compressed state as shown in Fig. 3A. Therefore, if the bar 113 is disengaged from the groove 112 and thus the rod 111 can be freely moved, the rod 111 is pushed up by an elastic force of the elastic part 114.
  • one pair of bars 113 are provided, however, several pairs of bars 113 may be provided. Of course, if several pairs of bars are provided, a plurality of grooves 112 corresponding to the number of bars 113 have to be provided.
  • the fixing part 116 serves only to fix the bar 113.
  • the fixing part 116 can be formed into a wide plate so as to be deformed along the deformation of the cell 10.
  • the fixing part 116 may be formed to have a narrow surface area as shown in Fig. 5.
  • the fixing part 116 is formed to have a wide surface area as shown in Fig. 3, only- one pair of fixing parts 116 can be provided.
  • the fixing part 116 is formed to have the narrow surface area as shown in Fig. 5, several pairs of fixing parts 116 may be provided to be correspondent to the bars 113.
  • the rod 111 can have any cross-sectional shape, such as a polygon, a circle, an oval and the like, only if the groove 112 engaged or disengaged with the bar 113 can be formed. Further, the rod 111 and the connection stick 115 may be independently manufactured and then assembled, and also they may be integrally formed with each other.
  • Fig. 4 is a view of a safeguard apparatus preventing overcharge for a secondary battery according to a second embodiment of the present invention, wherein Fig. 4A shows a normal state and Fig. 4B shows an overcharge state.
  • the safeguard apparatus 100b includes a cam 121 that is formed to be rotated around a fixing shaft 122 and have a long axis and a short axis orthogonal to each other,- at least a pair of sliding surfaces 125 that are respectively provided at faced surfaces of adjacent cells 10 and contacted with an external circumferential surface of the cam 121; a connection stick 123 that is contacted with an upper external circumferential surface of the cam 121, formed with a sliding part 124 formed at a lower end thereof to be rounded, and ) connected with a cut-off unit 200.
  • the cam 121 is formed to have a large diameter in one direction and a small diameter orthogonal to the large diameter. As shown in Fig. 4A, both ends of the long axis of the cam 121 are contacted with the sliding surfaces 125 in the ;; normal state, and thus the sliding part 124 formed at the lower end of the connection stick 123 is contacted with an end of the short axis of the cam 121.
  • connection stick 123 is
  • the long axis of the cam 121 is naturally directed downward due to characteristic of its own shape, if there is not any object that restricts the cam 121. That is, if the gas is exhausted from each cell 10 and the volume of the cell 10 is reduced, the distance between the cells 10 becomes wide again and the cam 121 is returned from the state of Fig. 4B to the state of Fig. 4A.
  • an additional weight is further provided at the long axis of the cam 121, or the long axis of the cam 121 is connected with the bottom surface through an elastic means like a spring.
  • Fig. 5 is a view of a safeguard apparatus preventing overcharge for a secondary battery according to a third embodiment of the present invention, wherein Fig. 5A shows a normal state and Fig. 5B shows an overcharge state.
  • the safeguard apparatus 100c includes at least a pair of fixing parts 135 that are respectively provided at faced surfaces of adjacent cells 10; at least a pair of upper links 131 of which one ends are respectively hinged to the fixing parts 135 and the other ends are hinged to each other so chat hinged portions are directed upward or downward; and a
  • the safeguard apparatus 100c further includes at least a pair of lower links 132 of which one ends are respectively hinged to the fixing parts 135 and the other ends are hinged
  • FIG. 5 shows the third i embodiment 100c that the hinged portions of the upper links 131 are directed upward and the hinged portions of the lower links 132 are directed downward, and also the lower links 132 and the elastic part 134 are provided so as to improve returning performance. Furthermore, although not shown in the
  • the elastic part 134 may be directly connected with the hinge shaft of the upper links 131.
  • the fixing part 135 is provided on a surface of the cell 10.
  • the fixing part 135 has a small surface. However, it may have a large surface like in the first embodiment (Fig. 3, 100a) .
  • the fixing part 135 is provided on the surface of each cell 10, and one end of each upper link 131 is hinged to each fixing part 135. The other ends of the upper links 131 are hinged to each other. Since the cut-off unit 200 and the hinge shaft on which the upper links 131 are hinged to each other are connected through the connection stick 133, if the volume of the cell 10 is increased and the distance between the cells 10 is reduced, the upper links 131 are folded and thus the cut-off unit 200 is moved upward.
  • an elastic part may be interposed between the bottom surface of the battery and the hinge shaft on which the upper links 131 are hinged to each other.
  • the hinge shaft of the upper links 131 has the same displacement as the cut-off 200. Therefore, if the cut-off unit 200 is moved upward, the elastic part is stretched and the hinge shaft the upper links 131 receives restoring force that is directed downward by the elastic force, so that the upper link 131 and the cut-off unit 200 can be facilely returned to their initial positions.
  • the lower links 132 are provided at the fixing parts 135 to be directed downward in the same manner of the upper links 131, and then the elastic part is disposed at the hinge shaft of the lower links 132, thereby obtaining the same effect as shown in Fig. 5.
  • the safeguard apparatus 100 if the safeguard apparatus 100 receives the horizontal force due to the reduced distance between the cells, the safeguard apparatus 100 converts the horizontal force into the vertical upward force so that the cut-off unit 200 is pushed up. However, the safeguard apparatus 100 may convert the horizontal force into the vertical downward force so that the cut-off unit 200 is pushed down so as to cut off the electric connection. Of course, it needs a precondition that the cutoff unit 200 should be not fitted tightly between the cells 10 when the volume of the cells is increased.
  • the surface of the cell 10 is formed of a soft material so that the movement of the cut-off unit 200 is not obstructed, or the cut-off unit 200 is formed of a flexible material so as to be easily movable through the narrowed distance.
  • the second embodiment 100b has the initial position of the cam 121 that the long axis is directed longitudinally and the short axis is directed transversely.
  • an additional weight or spring is further provided at the short axis.
  • the elastic part 134 is connected to the hinge shaft of the upper links 131, and the connection stick 133 is connected to the hinge shaft of the lower links 132.
  • any other configuration for moving down the cut-off unit 200 may be employed in the spirit and scope of inc invent ion .
  • the current can be efficiently cut off when the secondary battery is overcharged, it is possible to completely remove the risk of fire, explosion and the like caused by gas and overheat generated upon the overcharge.
  • the current can be facilely cut off using the simple mechanical structure and the swelling of the battery caused by gas generated upon the overcharge, it is possible to improve the reliability of cutting off the current.
  • the mechanical structure has a simple structure converting the horizontal force into the vertical force, it is easy and facile to design and manufacture it, and also the manufacturing cost is not so high.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Dispersion Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne un appareil de protection empêchant la surcharge d'une batterie secondaire. L'appareil de protection empêchant la surcharge d'une batterie secondaire est constitué d'une pluralité de cellules 10 qui sont agencées à intervalles réguliers et qui comprennent respectivement une cathode 1, une anode 2 et un électrolyte 3, la batterie secondaire comportant une partie de connexion 20 qui est formée d'un matériau conducteur et agencée au niveau d'un côté supérieur de chaque cellule 10 ; et une unité de coupure 200 qui est formée d'un matériau conducteur et mise en contact avec l'unité de connexion 20 ou séparée de celle-ci de façon à établir/couper une connexion électrique des cellules 10. Ledit appareil est caractérisé par le fait qu'il comprend un mécanisme d'actionnement mécanique qui est installé entre les cellules adjacentes 10 de la batterie secondaire de façon à convertir une force horizontale générée par une variation de volume de chaque cellule 10 en une force verticale.
PCT/KR2008/005643 2007-10-30 2008-09-23 Appareil de protection empêchant la surcharge d'une batterie secondaire Ceased WO2009057893A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0109423 2007-10-30
KR1020070109423A KR101046192B1 (ko) 2007-10-30 2007-10-30 2차 전지용 과충전 안전장치

Publications (1)

Publication Number Publication Date
WO2009057893A1 true WO2009057893A1 (fr) 2009-05-07

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PCT/KR2008/005643 Ceased WO2009057893A1 (fr) 2007-10-30 2008-09-23 Appareil de protection empêchant la surcharge d'une batterie secondaire

Country Status (2)

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KR (1) KR101046192B1 (fr)
WO (1) WO2009057893A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
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CN103022579A (zh) * 2011-09-26 2013-04-03 现代自动车株式会社 用于防止电池过充电的装置
CN107195831A (zh) * 2017-07-06 2017-09-22 江西优特汽车技术有限公司 一种硬壳动力电池模组及其制作方法
US9893344B2 (en) * 2013-12-24 2018-02-13 Hyundai Motor Company Safety device for preventing overcharging of battery
EP3565029A4 (fr) * 2016-12-30 2020-11-25 BYD Company Limited Dispositif de protection utilisé dans un bloc-batterie, bloc-batterie et véhicule
US10892468B2 (en) 2017-06-27 2021-01-12 Lg Chem, Ltd. Battery module with short-circuit unit, and battery pack and vehicle including the same
US10903476B2 (en) 2017-07-06 2021-01-26 Lg Chem, Ltd. Battery module and battery pack including same
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