WO2014104462A1 - Dispositif de sécurité et accumulateur le comprenant - Google Patents

Dispositif de sécurité et accumulateur le comprenant Download PDF

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Publication number
WO2014104462A1
WO2014104462A1 PCT/KR2013/000242 KR2013000242W WO2014104462A1 WO 2014104462 A1 WO2014104462 A1 WO 2014104462A1 KR 2013000242 W KR2013000242 W KR 2013000242W WO 2014104462 A1 WO2014104462 A1 WO 2014104462A1
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WO
WIPO (PCT)
Prior art keywords
safety device
secondary battery
positive electrode
main body
negative electrode
Prior art date
Application number
PCT/KR2013/000242
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English (en)
Korean (ko)
Inventor
김선재
Original Assignee
(주)열린기술
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Filing date
Publication date
Application filed by (주)열린기술 filed Critical (주)열린기술
Publication of WO2014104462A1 publication Critical patent/WO2014104462A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • 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
    • H01M50/581—Devices or arrangements for the interruption of current in response to temperature
    • 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 safety device and a secondary battery having the same, and more particularly, to a safety device and a secondary battery having the same according to the temperature of the secondary battery.
  • a secondary battery is a battery that can be charged and discharged unlike a primary battery that cannot be charged.
  • a high output secondary battery using a non-aqueous electrolyte of high energy density has been developed, and one battery cell is a pack type.
  • a portable electronic device such as a mobile phone, a notebook computer, or a camcorder is used.
  • the battery cells may have several dozens of battery cells.
  • the secondary batteries are manufactured in various shapes, and representative shapes include an electrode group (or jelly-roll type) by winding them in a vortex through a separator, which is an insulator, between a strip-shaped positive electrode plate and a negative electrode plate.
  • a separator which is an insulator, between a strip-shaped positive electrode plate and a negative electrode plate.
  • the secondary battery is composed of a positive electrode plate, a negative electrode plate, a separator and an electrolyte, and is charged / discharged by electromotive force generated when ions are transferred between the positive electrode plate and the negative electrode plate through an electrochemical reaction. Since the secondary battery has a high operating potential of the battery, high energy may flow instantaneously, and the positive electrode material rapidly reacts with the electrolyte due to a large increase in chemical activation due to overcharge, overdischarge, or short circuit (short). Generate gas. As a result, the pressure or temperature inside the secondary battery is rapidly increased, leading to an explosion of the battery, which may damage the peripheral device or damage the human body. Therefore, various types of safety devices for preventing explosions have been proposed.
  • Japanese Patent Laid-Open Nos. Hei 2-284350 and Hei 9-320549 disclose a technique for forming a straight or straight X-shaped groove on the surface of a case as a safety device of a secondary battery.
  • a crack is generated in a portion where the groove is formed so that the internal gas is released to the outside, so that the phenomenon of the secondary battery is not generated.
  • the secondary battery in which the groove is formed in the case has various disadvantages such as the size and location of the groove, and thus, the crack generation time is variously changed. Therefore, it is difficult to accurately design the crack generation time. .
  • the depth of the groove is slightly lowered, even if the case is expanded above the reference value, there is no risk of explosion because no crack is generated. If the depth of the groove is slightly deep, the crack is generated even if the case is slightly expanded. In addition, when a groove is formed in the case, the explosion of the battery may be prevented, but a fracture portion of the groove may be sharpened, which may cause injury to the human body.
  • the present invention has been proposed to solve the above problems, and provides a safety device capable of operating when the temperature of the secondary battery increases due to overcharging, overdischarging, or short circuiting, and a secondary battery having the same.
  • the present invention provides a safety device capable of exhausting gas generated in the inside of a secondary battery to the outside before reaching a critical operating temperature at which the secondary battery explodes, and a secondary battery having the same.
  • the present invention is a safety device and secondary battery that can cool the superheated secondary battery in a short time by discharging the oil vapor generated inside the secondary battery to the outside as soon as possible due to a malfunction of the secondary battery to the outside as soon as possible To provide.
  • Safety device for achieving the above object, the main body mounted to the object; An exhaust port formed at one side of the main body; A mounting part formed inside the main body to have a shape opened toward the object; And a perforation part inserted into the mounting part, wherein the perforation part may be formed to be exposed to the outside of the main body when the object reaches a critical operating temperature.
  • the safety device when an object such as a secondary battery on which the safety device is mounted is overheated, the safety device operates to prevent an accident such as an explosion of an object such as a secondary battery.
  • the perforation may be formed to be fixed to the sliding member sliding in contact with the side wall of the mounting portion toward the object to move with the sliding member.
  • the perforation may be formed to penetrate the sliding member.
  • An elastic member may be provided between the sliding member and the ceiling of the mounting unit to press the sliding member toward the object.
  • the opening of the mounting portion may be fitted with a cap member.
  • a lower end of the cap member may be fitted into the opening to protrude toward the object rather than the lower end of the main body.
  • An adhesive member is mounted on a lower surface of the main body, and the thickness of the adhesive member may be equal to or greater than the protruding height of the cap member.
  • the cap member may include a through hole through which the perforation part passes, and the through hole may be formed toward the object.
  • a thermal spacer may be formed between the sliding member and the cap member.
  • the elastic member may be provided in a compressed state between the sliding member and the ceiling of the mounting unit, and the thermal spacer may be provided in a pressed state between the sliding member and the cap member by the elastic force of the elastic member.
  • the ceiling of the mounting portion may be formed with a positioning groove in which the upper end of the drilling portion is seated.
  • the thermal spacer may melt.
  • the cap member may include an accommodating part accommodating the molten thermal spacer, and the accommodating part may be formed to communicate with the through hole.
  • An exhaust passage may be formed in the perforated part along the longitudinal direction thereof.
  • the cap member may be formed of a material having high thermal conductivity to transfer the temperature of the object to the thermal spacer.
  • Sealing material may be applied to the positioning groove.
  • the exhaust port may be equipped with an exhaust pipe.
  • the exhaust pipe is mounted to a connection member mounted to the exhaust port, and the connection member may be provided with a protrusion to prevent separation of the exhaust pipe.
  • the electrode group including at least one positive electrode plate and negative electrode plate;
  • a battery case accommodating the electrode group;
  • a cover member formed at a connection portion of the positive electrode tab and the positive electrode external terminal and at a connection portion of the negative electrode tab and the negative electrode external terminal, respectively;
  • a safety device mounted on one surface of the electrode case to be positioned on an upper surface of the cover member.
  • the cover member may include an upper cover member and a lower cover member.
  • a safety vent groove may be engraved on an upper surface of the upper cover member, and the safety device may be positioned above the safety vent groove.
  • the electrode group including at least one positive electrode plate and negative electrode plate;
  • a battery case accommodating the electrode group;
  • a vent spacer provided inside the battery case to be positioned between the positive electrode tab and the negative electrode tab;
  • a safety device mounted on one surface of the electrode case so as to be positioned on an upper surface of the vent spacer.
  • a safety vent groove is formed in an intaglio on an upper surface of the vent spacer, and the safety device may be positioned above the safety vent groove.
  • the safety device the body is mounted to the battery case; An exhaust port formed at one side of the main body; A mounting part formed inside the main body to have a shape opened toward the battery case; A perforation part inserted into the mounting part; And a sliding member fixed to the perforation part and sliding in contact with the side wall of the mounting part toward the battery case.
  • the safety device and the secondary battery having the same can prevent the secondary battery from exploding due to overheating because the safety device operates when the temperature of the secondary battery increases due to a malfunction.
  • the safety device and the secondary battery having the same according to the present invention may exhaust the gas generated inside the secondary battery to the outside before the secondary battery reaches a critical operating temperature at which the secondary battery explodes.
  • the secondary battery malfunctions to discharge the vapor generated in the inside of the secondary battery to the outside as soon as possible by discharging the secondary battery to the outside from as far away from the secondary battery as fast as possible It can cool inside.
  • the safety device according to the present invention has a low possibility of malfunction even after long time storage and can prevent the battery case from being inadvertently damaged, and can be easily mounted on the secondary battery even by post-working.
  • the safety device can increase the safety of the secondary battery or the device in which the secondary battery is used since the secondary battery is not separated from the secondary battery even in an environment subjected to a lot of shock or vibration.
  • FIG. 1 is an exploded perspective view schematically showing the inside of a secondary battery according to an embodiment of the present invention.
  • FIG. 2 is an exploded perspective view illustrating a coupling structure of a positive electrode tab and a positive electrode external terminal of a secondary battery according to an exemplary embodiment of the present invention.
  • FIG. 3 is a side view illustrating a coupling structure of the positive electrode tab and the positive electrode external terminal according to FIG. 2.
  • FIG. 4 is a cross-sectional view taken along the line “IV-IV” of FIG. 3.
  • FIG 5 and 6 are cross-sectional views of the safety device according to an embodiment of the present invention.
  • FIG. 7 is a plan view of a safety device according to an embodiment of the present invention.
  • FIG. 8 is a left side view of the safety device according to FIG. 7.
  • 9 and 10 are cross-sectional views showing the operating state of the safety device according to an embodiment of the present invention.
  • FIG. 11 is a view illustrating a secondary battery according to another embodiment of the present invention.
  • FIG. 1 is an exploded perspective view schematically showing the inside of a secondary battery according to an embodiment of the present invention
  • Figure 2 is an exploded view showing a coupling structure of the positive electrode tab and the positive electrode external terminal of the secondary battery according to an embodiment of the present invention
  • 3 is a side view illustrating a coupling structure of the positive electrode tab and the positive electrode external terminal according to FIG. 2
  • FIG. 4 is a cross-sectional view taken along the cutting line “IV-IV” of FIG. 3
  • FIGS. 5 and 6 illustrate one embodiment of the present invention.
  • 7 is a plan view of a safety device according to an embodiment of the present invention
  • FIG. 8 is a left side view of the safety device according to FIG. 7, and
  • FIGS. 9 and 10 are one embodiment of the present invention.
  • Figure 11 is a cross-sectional view showing an operating state of the safety device according to Figure 11 is a view showing a secondary battery according to another embodiment of the present invention.
  • the safety device according to the present invention to be described below can be applied not only to a secondary battery having a stacked electrode group, but also to another type (for example, a battery including a jelly roll type winding electrode group or one positive electrode plate and one It can also be applied to a secondary battery of a battery including an electrode group formed by folding a negative electrode plate.
  • a secondary battery including a stacked electrode group formed by stacking at least one positive electrode plate and at least one negative electrode plate will be described as an example.
  • a secondary battery 10 may include battery cases 1 and 3 and an electrode group 20 accommodated in the battery cases 1 and 3. .
  • the battery cases 1 and 3 may include a metal outer material or a pouch, and the shape of the battery cases 1 and 3 is not limited.
  • the battery case (1, 3) is preferably formed of a material that can be damaged or punctured by the safety device 100 to be described later.
  • the battery cases 1 and 3 may include an upper case 1 and a lower case 3, and a space for accommodating the electrode group 20 and an electrolyte (not shown) is provided inside the lower case 3. Can be formed. Junctions 2 and 4 may be formed at edges of the upper case 1 and the lower case 3, respectively. A joining member (not shown) is disposed between the joining parts 2 and 4 to seal the upper case 1 and the lower case 3.
  • the electrode group 20 is formed by alternately stacking at least one positive electrode plate 11 and a negative electrode plate 16, and a separator (not shown) is positioned between the positive electrode plate 11 and the negative electrode plate 16.
  • the positive electrode tab 12 protrudes on one side of the positive electrode plate 11, and the negative electrode tab 17 protrudes on one side of the negative electrode plate 16.
  • the positive electrode plate 11 is laminated so that the positive electrode tabs 12 may be assembled with each other, and the negative electrode plate 16 is laminated so that the negative electrode tabs 17 may be collected with each other. At this time, the positive electrode tab 12 and the negative electrode tab 17 are located on the same side.
  • the positive electrode tabs 12 of the at least one positive electrode plate 11 are collected together and connected to the positive electrode external terminal 30, and the negative electrode tab 17 of the at least one negative electrode plate 16 is connected.
  • the connection method or connection structure of the positive electrode tab 12 and the positive electrode external terminal 30 is the same as that of the negative electrode tab 17 and the negative electrode external terminal. 2 to 4 illustrate the connection structure of the positive electrode tab 12 and the positive electrode external terminal 30.
  • the positive electrode tab 12 and the positive electrode outer terminal 30 may be fastened to each other by fastening means 36 and 37 such as rivets or nuts / bolts.
  • a fastening hole 31 for fitting the fastening means 36 may be formed in the positive electrode tab 12 and the positive electrode external terminal 30.
  • the cover member 40 is connected to the positive electrode tab 12 and the positive electrode external terminal 30 so that the upper and lower ends of the fastening means 36 and 37 do not directly contact the battery cases 1 and 3. Can be formed.
  • a cover member may be formed on the connection portion between the negative electrode tab 17 and the negative electrode external terminal (not shown).
  • the cover member 40 may include an upper cover member 41 and a lower cover member 46.
  • the safety vent groove 41 may be formed in an intaglio on an upper surface of the upper cover member 41.
  • the upper groove 44 in which the upper ends of the fastening members 36 and 37 are positioned, and the stepped portion 43 in which the positive electrode tab 12 and the positive electrode external terminal 30 are located.
  • the upper groove 44 is in the form of an intaglio groove formed in the step 43.
  • the lower cover member 46 has a lower groove 48 in which lower ends of the fastening members 36 and 37 are positioned, and a step portion 47 in which the positive electrode tab 12 and the positive electrode external terminal 30 are positioned. Can be formed.
  • the lower groove 48 is in the form of an intaglio groove formed in the step 47.
  • the cover member 40 may be sealed by the battery cases 1 and 3.
  • the safety device 100 may be positioned on an upper portion of the safety vent groove 42 formed in the upper cover member 41 of the cover member 40.
  • the safety device 100 operates when the internal temperatures of the battery cases 1 and 3 or the secondary battery 10 rise, and the secondary battery 10 explodes by forming holes in the battery cases 1 and 3. Can be prevented.
  • a safety device will be described in detail with reference to the accompanying drawings.
  • the safety device 100 is attached to one surface of the battery case (1, 3), the safety device 100 is the upper portion of the upper cover member 41 It is preferably attached to one surface of the battery case (1, 3) so as to be located at The perforated part 131 of the safety device 100 to be described later penetrates through the safety vent groove 42 of the upper cover member 41 to make holes in the battery cases 1 and 3.
  • the main body 110 to be mounted on the target to the secondary battery 10, the exhaust port 113 formed on one side of the main body 110, the target to secondary battery 10 It may include a mounting portion (111, 112) formed in the interior of the main body 110 to have a shape that is opened toward the perforations 131 inserted into the mounting portion (111, 112).
  • the puncturing part 131 may be formed to be exposed to the outside of the main body 110 when the object to the secondary battery 20 reaches the operating temperature.
  • the safety device 100 operates before the secondary battery 10 reaches an exploding temperature, that is, a critical operating temperature. By expelling the gas such as oil vapor generated in the secondary battery 10 to the outside quickly, it is possible to prevent the secondary battery 10 to explode.
  • the safety device when the secondary battery that is the object on which the safety device is mounted is overheated, the safety device operates to prevent an accident such as the secondary battery explodes.
  • the main body 110 of the safety device 100 is an opening for exhausting a gas, such as oil vapor generated in the interior of the secondary battery 10 and the portion to which the safety device 100 is mounted or the object or the secondary battery 10. There is a part. A portion opened to exhaust gas such as oil vapor is an exhaust port 113 formed in the main body 110.
  • the exhaust pipe 113 may be equipped with an exhaust pipe 101.
  • the exhaust pipe 101 preferably has a tube or pipe shape, and one end of the exhaust pipe 101 connected to the exhaust port 113 should have a sufficient length so that the exhaust pipe 101 is far from the exhaust port 113.
  • the oil vapor generated inside the secondary battery 10 should be exhausted as far as possible from the secondary battery 10 because of its high ignition.
  • the cobalt of the active material of the secondary battery 10 has a high oxidation rate, so the cobalt contained in the oil vapor, etc. should be delayed as long as possible for the contact with oxygen and the exhaust pipe 101 has a sufficient length, for example, a length of 1 m or more.
  • the exhaust port 113 and the exhaust pipe 101 can cool the secondary battery 10 by quickly discharging and diluting gas such as oil vapor to the outside of the secondary battery 10.
  • the safety of the secondary battery 10 can be ensured by delaying the time for the active material such as cobalt to react with oxygen as much as possible.
  • the exhaust pipe 101 may be directly connected to the exhaust port 113 of the main body 110, but as shown in the drawing, the exhaust pipe 101 may be connected to the exhaust port 113 through a separate connection member 102.
  • the connecting member 102 is formed between the fastening part 105 inserted into the exhaust port 113, the inserting part 103 inserted into the exhaust pipe 101, and the fastening part 105 and the inserting part 103.
  • 102 may include a flange portion (not shown) that limits the depth that is inserted into the body 110.
  • the insertion part 103 of the connection member 102 may have a protrusion 104 to prevent separation of the exhaust pipe 101.
  • the protrusion 104 is preferably formed to be inclined downward toward the outside of the exhaust port 113.
  • mounting parts 111 and 112 opening toward the secondary battery 10 or the object may be formed inside the main body 110.
  • the mounting parts 111 and 112 are spaces formed at the bottom of the main body 110 to be bonded to the secondary battery 10 to be intaglio inside the main body 110.
  • the mounting parts 111 and 112 should communicate with the exhaust port 113.
  • the lower ends of the mounting portions 111 and 112 are open, but the upper ends are not open.
  • the upper ends of the mounting parts 111 and 112, that is, the ceiling, may support the elastic member 126 and the punching part 131 which will be described later.
  • the mounting parts 111 and 112 may be divided into two parts. It may be divided into an opening 112 at a lower end and an upper end 111 formed at an upper portion of the opening 112.
  • the upper end 111 is formed to have the same width, while the opening 112 has a width that increases toward the lower end. That is, the opening 112 may be formed in a conical or trapezoidal longitudinal section thereof.
  • the perforations 131 may be provided in the mounting parts 111 and 112 along the height direction of the mounting parts 111 and 112.
  • the perforation part 131 is a member that penetrates through the safety vent groove 42 and the battery cases 1 and 3 of the upper cover member 41.
  • the length of the perforated portion 131 is smaller than the height or depth of the mounting portions 111 and 112, the exhaust passage 132 may be formed in the perforated portion 131 in the longitudinal direction thereof.
  • the approximate shape of the aperture 131 is similar to a syringe needle.
  • the lower end of the perforations 131 through which the safety vent groove 42 and the battery cases 1 and 3 are to be drilled has an oblique cut shape. At this time, it is preferable that the lower end of the perforated portion 131 is cut at an appropriate inclination so as not to penetrate the other surface facing one surface of the battery case (1,3) to which the safety device 100 is attached.
  • a seating groove 116 may be formed in the ceiling of the mounting parts 111 and 112 on which the upper end of the perforation part 131 is seated. In the state where the upper end of the punching portion 131 is seated in the positioning groove 116, the lower end of the punching portion 131 is not exposed to the outside of the main body 110.
  • the width of the mounting portions 111 and 112 is larger than the width (or diameter) of the perforations 131. Accordingly, the sliding member 136 may be provided inside the mounting portions 111 and 112 as a separate guide member so that the perforations 131 may move up and down inside the mounting portions 111 and 112.
  • the sliding member 136 is a member moving in the height direction of the mounting parts 111 and 112 in the mounting parts 111 and 112, and the perforation part 131 may move together as the sliding member 136 moves. To this end, the perforations 131 may be formed to penetrate the sliding member 136. That is, the perforation part 131 is fixedly coupled to the sliding member 136 so that the perforation part 131 and the sliding member 136 move integrally.
  • the perforation part 131 may be formed to be fixed to the sliding member 136 that contacts the sidewalls of the mounting parts 111 and 112 and slides toward the object or the secondary battery 10 to move together with the sliding member 136.
  • the sliding member 136 is preferably formed of a plate-like member so that the side surface thereof may contact the side walls of the mounting portions 111 and 112.
  • the outer diameter of the sliding member 136 is smaller than the inner diameter of the mounting portions 111 and 112, so that the sliding member 136 can smoothly slide along the sidewall surfaces of the mounting portions 111 and 112.
  • An elastic member 126 may be provided between the sliding member 136 and the ceiling of the mounting portions 111 and 112 to press the sliding member 136 toward the object or the secondary battery 10.
  • the elastic member 126 is preferably formed of a coil spring, but is not necessarily limited to the coil spring. Any form can be applied as long as the sliding member 136 or the perforation 131 can be pushed toward the secondary battery 10 by the elastic restoring force.
  • FIG. 5 and 6 illustrate an example in which the elastic member 126 is a coil spring.
  • the upper end of the elastic member 126 is formed to abut the ceiling of the mounting portions 111 and 112 and the lower end is abutted against the sliding member 136.
  • 5 is a state in which the elastic member 126 is compressed
  • FIG. 6 is a state in which the elastic member 126 is restored. That is, FIG. 6 is a state in which the external force (pressure) applied to the elastic member 126 is removed
  • FIG. 5 is a state in which the elastic member 126 is compressed because an external force (pressure) is applied to the elastic member 126.
  • a cap element 150 may be fitted into the opening 112 of the mounting portions 111 and 112 to compress the elastic member 126.
  • the cap member 150 must be press-fitted or tightly fitted into the opening 112 formed in a conical shape on the lower side of the mounting portions 111 and 112.
  • the cap member 150 may also be formed to have a conical shape or a trapezoidal cross section.
  • the cap member 150 should be fitted to the main body 110 so hard that the cap member 150 is not pushed out by the elastic restoring force of the elastic member 126.
  • the lower end of the cap member 150 (one end facing the object or the secondary battery 10) may be fitted into the opening 112 to protrude toward the object or the secondary battery 10 than the lower end of the main body 110. That is, as shown in FIGS. 5 and 6, the lower end of the cap member 150 is positioned outside the lower end of the main body 110, that is, the secondary battery 10 in the state of being fitted to the opening 112 of the mounting portions 111 and 112 as much as possible. It can be fitted to the mounting portion 112 to protrude toward.
  • An adhesive member 120 may be mounted on the bottom surface of the main body 110, and the thickness of the adhesive member 120 may be equal to or greater than the protruding height of the cap member 150.
  • the adhesive member 120 is a member for simultaneously bonding the outer surfaces of the main body 110 and the secondary battery 10, and a double-sided adhesive tape or an adhesive may be used.
  • the cap member 150 has a through hole 152 through which the punching part 131 passes, and the through hole 152 may be formed toward the object or the secondary battery 10. An upper end of the cap member 150 may be opened, and an accommodating part 151 may be formed therein, and a through hole 151 may be formed at a bottom of the accommodating part 151.
  • the width to diameter of the storage unit 152 is preferably larger than the width to diameter of the through hole 151.
  • the diameter to the width of the through hole 151 should not be smaller than the outer diameter of the perforated portion 131.
  • the lower surface of the sliding member 136 does not directly contact the upper end of the cap member 150 in the state before the drilling unit 131 is operated (see FIG. 5), and the sliding member 136 and the cap member 150 are not in contact with each other.
  • the thermal spacer 140 may be formed.
  • the thermal spacer 140 is positioned between the sliding member 136 and the cap member 150 such that the upper end of the perforation part 131 is seated in the positioning groove 116. That is, the thermal spacer 140 should have a thickness or height such that the upper end of the perforation portion 131 is seated in the positioning groove 116 in a state provided between the sliding member 136 and the cap member 150.
  • the elastic member 126 is provided in a compressed state between the ceiling of the sliding member 136 and the mounting portions 111 and 112, the thermal spacer 140 is the sliding member 136 and the cap member by the elastic force of the elastic member 126 It may be provided in a pressurized state between the 150.
  • the thermal spacer 140 may be melted when the object or the secondary battery 10 reaches the operating temperature. For example, before the secondary battery 10 reaches the critical operating temperature at which the secondary battery 10 is exploded when the temperature increases due to a malfunction such as overcharge, overdischarge, or short circuit, the safety device 100 is attached. The thermal spacer 140 is melted.
  • the thermal spacer 140 is similar to a thermal fuse and the like, and may be formed of an organic material similar to a component such as a candle, paraffin, or soap.
  • the thermal spacer 140 is formed of an organic compound, such as a candle or paraffin.
  • a sealing material is preferably applied to the ceiling positioning grooves 116 of the mounting portions 111 and 112 in contact with the upper ends of the perforations 131.
  • the thermal spacer 140 should be manufactured so that the melting point is determined according to the critical operating temperature of the object to which the safety device 100 is attached or the secondary battery 10.
  • Thermal spacer 140 according to an embodiment of the present invention is preferably formed to be melted in the range 95 °C ⁇ 100 °C. Since the thermal spacer 140 melts according to the temperature of the secondary battery 10, it is important that the temperature of the secondary battery 10 is well transmitted to the thermal spacer 140.
  • the cap member may be formed of a material having high thermal conductivity so as to transfer the temperature of the object or secondary battery 10 to the thermal spacer 140.
  • the cap member 150 is preferably made of a copper series metal such as brass having high thermal conductivity.
  • a thermal cream or thermal grease may be applied between the bottom of the cap member 150 and the outer surface of the secondary battery 10 for thermal conduction.
  • the thermal spacer 140 When the temperature of the secondary battery 10 reaches a critical operating temperature and the thermal spacer 140 is melted, the thermal spacer 140 is in a molten state, and the molten thermal spacer 140 flows downward by gravity.
  • the molten thermal spacer 140 is collected in the accommodating part 151 formed in the cap member 150. That is, the accommodating part 151 of the cap member 150 may be referred to as a space for accommodating the molten thermal spacer 140.
  • the sliding member 126 When the thermal spacer 140 is melted, the sliding member 126 is moved toward the cap member 150 by the elastic force or the elastic restoring force of the elastic member 126, and as the sliding member 136 moves, The lower end may pass through the through hole 152 and be exposed to the outside of the main body 110.
  • the safety device 100 illustrated in FIG. 5 is in a state before the thermal spacers 140 are melted, and the safety device 100 illustrated in FIG. 6 is in a state after the thermal spacers 140 are melted.
  • the temperature of the secondary battery 10 to which the safety device 100 is attached increases to a temperature immediately before the critical operating temperature
  • the thermal spacer 140 is melted and the thermal spacer 140 is melted to compress the elastic member ( 126 pushes the sliding member 136 downward, that is, toward the secondary battery 10 by the elastic restoring force.
  • the thermal spacer 140 melts, the molten thermal spacer 140 flows into the receiving portion 151 of the cap member 150, so that the sliding member 136 is moved downward by the elastic member 126. .
  • the lower end of the drilling part 131 passes through the through hole 152 and is exposed to the outside of the main body 110.
  • the secondary battery 10 according to an embodiment of the present invention, the electrode group 20, including the at least one positive electrode plate 11 and the negative electrode plate 16 stacked, the battery case in which the electrode group 20 is accommodated (1, 3), the positive electrode external terminal 30 and the negative electrode external terminal (not shown) connected to the positive electrode tab 12 of the positive electrode plate 11 and the negative electrode tab 17 of the negative electrode plate 16, respectively, the positive electrode tab 12 ) And the electrode case (1, so as to be located on the upper surface of the cover member 40 and the cover member 40 formed on the connection portion of the positive electrode external terminal 30 and the negative electrode tab 17 and the negative electrode external terminal, respectively). 3) may include a safety device 100 mounted on one surface.
  • the cover member 40 includes an upper cover member 41 and a lower cover member 46, and a safety vent groove 41 is formed on the upper surface of the upper cover member 41 in an intaglio, and the safety device 100 is It may be located above the safety vent groove 42.
  • the safety device 100 may be attached to the surfaces of the battery cases 1 and 3 so as to be above the cover member 40 of the secondary battery 10. Can be. In the case of FIG. 9, the safety device 100 does not operate as the secondary battery 10 operates normally. When the secondary battery 10 is in the normal temperature range, since the thermal spacer 140 is not melted, the upper end of the perforation part 131 is in close contact with the ceiling positioning groove 116 of the mounting parts 111 and 112.
  • the temperature of the secondary battery 10 is increased to melt the thermal spacer 140.
  • the sliding member 136 is moved downward by the elastic restoring force of the elastic member 126.
  • the perforations 131 fixed to the sliding member 136 are also moved downward.
  • the perforation part 131 moves downward, passes through the through-hole 151, drills the safety vent groove 42 of the cover member 40, and makes holes in the battery cases 1 and 3.
  • Gases such as vapor generated in the overheated secondary battery 10 are discharged to the outside of the secondary battery 10 through the holes of the battery cases 1 and 3, thereby preventing the secondary battery 10 from exploding. have.
  • Gas such as oil vapor discharged through the holes of the battery cases 1 and 3 formed by the drilling portion 131 flows into the exhaust flow path 132 formed inside the drilling portion 131 and passes through the exhaust pipe 101. The air can be exhausted to the air far away from the secondary battery 10 (see the dashed arrows in FIG. 10 for the flow path of gas such as steam).
  • the safety device 100 according to an embodiment of the present invention When the safety device 100 according to an embodiment of the present invention is used in the secondary battery 10, the safety device 100 according to the present invention may be applied to a secondary battery without the cover member 40.
  • the secondary battery 10 according to another embodiment of the present invention illustrated in FIG. 11 is a secondary battery having no cover member at a portion connecting the electrode tab and the external electrode terminal.
  • the secondary battery according to another embodiment of the present invention illustrated in FIG. 11 is the same as the secondary battery according to the exemplary embodiment of the present invention except that there is no cover member and there is a vent spacer.
  • the same reference numerals are used for the same parts.
  • the secondary battery 10 includes an electrode group 20 and an electrode group 20 including at least one positive electrode plate 11 and a negative electrode plate 16 stacked thereon.
  • the battery case (1, 3), the positive electrode tab 12 of the positive electrode plate 11 and the negative electrode tab 17 of the negative electrode plate 16 is connected to each other, the positive electrode external terminal 30 and the negative electrode external terminal (not shown)
  • a vent spacer 160 provided inside the battery cases 1 and 3 so as to be positioned between the positive electrode tab 12 and the negative electrode tab 17 and the electrode case so as to be positioned on the top surface of the vent spacer 160. It may include a safety device (100) mounted on one surface of (1,3).
  • vent spacer 160 is positioned between the positive electrode tab 12 and the negative electrode tab 17 and sealed by the battery cases 1 and 3. Therefore, in the case of the secondary battery without the cover member, the vent spacer 160 may be installed between the positive electrode tab 12 and the negative electrode tab 17, and the safety device 100 may be mounted on the vent spacer 160.
  • a safety vent groove 166 is formed in an intaglio on an upper surface of the vent spacer, and the safety device 100 may be positioned above the safety vent groove 166.
  • the thermal spacer 140 of the safety device 100 is melted, the perforation part 131 passes through the safety vent groove 166 of the vent spacer 160 to make holes in the battery cases 1 and 3. This operation can prevent the explosion of the secondary battery (10).
  • the safety device 100 operating in accordance with the temperature, it is possible to ensure the safety of the object such as the secondary battery 10 to which the safety device 100 is attached.
  • the present invention can be used in flat batteries, secondary batteries, energy storage devices and the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

Un dispositif de sécurité selon la présente invention comprend : un corps principal qui est monté sur un objet cible ; une sortie qui est formée sur un côté du corps principal ; une partie de montage qui est formée dans le corps principal pour avoir une forme ouverte vers l'objet cible ; et une partie de perforation qui est insérée dans la partie de montage, la partie de perforation pouvant être formée pour être découverte à l'extérieur du corps principal quand l'objet cible atteint une température de fonctionnement critique. En conséquence, le dispositif de sécurité est actionné quand l'objet cible, par exemple un accumulateur, sur lequel est monté le dispositif de sécurité est surchauffé, afin d'éviter un accident dans lequel l'objet cible qui est l'accumulateur explose.
PCT/KR2013/000242 2012-12-27 2013-01-11 Dispositif de sécurité et accumulateur le comprenant WO2014104462A1 (fr)

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KR1020120154191A KR101287411B1 (ko) 2012-12-27 2012-12-27 안전장치 및 이를 구비한 이차전지
KR10-2012-0154191 2012-12-27

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WO2014104462A1 true WO2014104462A1 (fr) 2014-07-03

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Cited By (1)

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US10622607B2 (en) 2017-11-07 2020-04-14 Ford Global Technologies, Llc Electrified vehicle battery packs designed with sacrificial components

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Publication number Priority date Publication date Assignee Title
KR101730575B1 (ko) * 2014-10-17 2017-04-26 주식회사 엘지화학 배터리 안전성 실험 장치
WO2016085271A1 (fr) * 2014-11-26 2016-06-02 주식회사 엘지화학 Dispositif et procédé permettant de mesurer l'épaisseur d'une cellule de batterie rechargeable
KR101783923B1 (ko) 2014-11-26 2017-10-10 주식회사 엘지화학 이차전지 셀의 두께 측정장치 및 방법

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JPH02284350A (ja) * 1989-04-25 1990-11-21 Matsushita Electric Ind Co Ltd 有機電解液電池用安全装置
JPH09320549A (ja) * 1996-05-29 1997-12-12 Norihiro Oonishi リチウム二次電池用外装缶
KR100490545B1 (ko) * 2002-12-18 2005-05-17 삼성에스디아이 주식회사 이차 전지
KR100502337B1 (ko) * 2002-12-26 2005-07-20 삼성에스디아이 주식회사 리튬 이차 전지

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KR100615155B1 (ko) * 1999-09-09 2006-08-25 삼성에스디아이 주식회사 각형 이차전지와 그 제조 방법

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JPH02284350A (ja) * 1989-04-25 1990-11-21 Matsushita Electric Ind Co Ltd 有機電解液電池用安全装置
JPH09320549A (ja) * 1996-05-29 1997-12-12 Norihiro Oonishi リチウム二次電池用外装缶
KR100490545B1 (ko) * 2002-12-18 2005-05-17 삼성에스디아이 주식회사 이차 전지
KR100502337B1 (ko) * 2002-12-26 2005-07-20 삼성에스디아이 주식회사 리튬 이차 전지

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10622607B2 (en) 2017-11-07 2020-04-14 Ford Global Technologies, Llc Electrified vehicle battery packs designed with sacrificial components

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