WO2023080479A1 - 과충전 방지가 가능한 이차전지 및 이의 충전방법 - Google Patents
과충전 방지가 가능한 이차전지 및 이의 충전방법 Download PDFInfo
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- WO2023080479A1 WO2023080479A1 PCT/KR2022/015597 KR2022015597W WO2023080479A1 WO 2023080479 A1 WO2023080479 A1 WO 2023080479A1 KR 2022015597 W KR2022015597 W KR 2022015597W WO 2023080479 A1 WO2023080479 A1 WO 2023080479A1
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- Prior art keywords
- secondary battery
- lead
- alloy
- voltage
- temperature
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims description 33
- 239000002184 metal Substances 0.000 claims description 33
- 229910000990 Ni alloy Inorganic materials 0.000 claims description 20
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 12
- 229910001000 nickel titanium Inorganic materials 0.000 claims description 11
- URQWOSCGQKPJCM-UHFFFAOYSA-N [Mn].[Fe].[Ni] Chemical compound [Mn].[Fe].[Ni] URQWOSCGQKPJCM-UHFFFAOYSA-N 0.000 claims description 10
- UTICYDQJEHVLJZ-UHFFFAOYSA-N copper manganese nickel Chemical compound [Mn].[Ni].[Cu] UTICYDQJEHVLJZ-UHFFFAOYSA-N 0.000 claims description 8
- VAWNDNOTGRTLLU-UHFFFAOYSA-N iron molybdenum nickel Chemical compound [Fe].[Ni].[Mo] VAWNDNOTGRTLLU-UHFFFAOYSA-N 0.000 claims description 8
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 15
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 229910000640 Fe alloy Inorganic materials 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 5
- 229910000881 Cu alloy Inorganic materials 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 2
- -1 copper-zinc-aluminum Chemical compound 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 229910052987 metal hydride Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
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- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
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- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Images
Classifications
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
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- H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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- 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 secondary battery capable of preventing overcharging and a charging method thereof.
- lithium secondary batteries with high energy density and high discharge voltage are particularly widely used.
- an essential consideration in the development of a lithium secondary battery is to secure safety.
- a safety element mounted on the outside of the cell includes a PTC device using temperature change, a CID device, a protection circuit using voltage change, and a safety vent using change in internal voltage of the battery. Adding a chemically and electrochemically changeable substance belongs to the latter.
- an object of the present invention is to provide a secondary battery and a charging method thereof in which safety problems due to overcharging are improved by detecting an overcharging situation of the secondary battery and stopping charging current supplied to the secondary battery.
- the present invention in one embodiment, the present invention
- An electrode assembly having an anode lead and a cathode lead at both ends;
- the conductive wire part is introduced to the other end of the side electrically connected to the cathode lead to provide a secondary battery including a temperature sensitive part electrically connecting the cathode lead and the cathode lead according to temperature conditions.
- the shape of the temperature sensing unit is deformed when exposed to a temperature of 70° C. to 100° C., so that the anode lead and the cathode lead may be electrically connected.
- the temperature sensitive part is made of a shape memory alloy including a nickel-titanium alloy, or an alloy of a first metal made of an alloy of nickel iron and an alloy of nickel manganese iron, an alloy of nickel molybdenum iron, or an alloy of nickel manganese copper. It may be composed of a bimetal containing a second metal.
- the voltage measuring unit may measure the voltage between the positive lead and the negative lead when the conductive wire is connected to the negative lead due to deformation of the temperature sensing unit.
- the secondary battery may include a control unit that is electrically connected to the voltage measurement unit and receives a voltage value measured by the voltage measurement unit.
- the control unit may stop charging of the secondary battery when the voltage value received from the voltage measurement unit is greater than or equal to a predetermined value.
- a method for charging a secondary battery including stopping charging of the secondary battery when the measured voltage value is greater than or equal to a predetermined value.
- the shape of the temperature sensing unit is deformed when exposed to a temperature of 70° C. to 100° C., so that the anode lead and the cathode lead may be electrically connected.
- the temperature sensing part is composed of a shape memory alloy including a nickel-titanium alloy, or an alloy of a first metal made of a nickel-iron alloy and a nickel-manganese-iron alloy, a nickel-molybdenum-iron alloy, or a nickel-manganese-copper alloy. It may be composed of a bimetal including a second metal made of.
- the secondary battery according to the present invention includes a conducting wire electrically connecting a positive electrode lead and a negative electrode lead, and a temperature sensitive unit whose shape is deformed under high temperature conditions is introduced to an end of the negative lead side of the conducting wire, and between the positive lead and the negative lead in case of overcharging.
- FIG. 1 is a top view schematically showing the configuration of a secondary battery according to a first embodiment of the present invention.
- FIG. 2 is a schematic front view of the secondary battery of FIG. 1 .
- FIG. 3 is a front view illustrating a state in which the shape memory alloy, which is a temperature sensitive part in FIG. 2 , is deformed and connected to an anode lead.
- FIG. 4 is a front view schematically showing the configuration of a secondary battery according to a second embodiment of the present invention.
- FIG. 5 is a front view illustrating a state in which a bimetal, which is a temperature sensitive part in FIG. 4 , is deformed and connected to an anode lead.
- the present invention in one embodiment, the present invention
- An electrode assembly having an anode lead and a cathode lead at both ends;
- the conductive wire part is introduced to the other end of the side electrically connected to the cathode lead to provide a secondary battery including a temperature sensitive part electrically connecting the cathode lead and the cathode lead according to temperature conditions.
- the secondary battery according to the present invention includes an electrode assembly each having a positive electrode lead and a negative electrode lead, and the electrode assembly may include a positive electrode, a negative electrode, and a separator disposed between them in a battery case.
- the electrode assembly may be placed in a pouch, the positive electrode connected to the positive electrode lead, and the negative electrode connected to the negative electrode lead, protruding outward from the pouch, and then sealing the edge of the pouch by thermal compression.
- the present invention may also be applied to a type in which the positive lead and the negative lead are disposed at one end of the electrode assembly.
- the cathode lead of the electrode assembly includes a conducting wire part to which one end is electrically connected.
- the conductive wire part is electrically connected to the positive lead, and the conductive wire end may be connected by welding the end of the conductive wire to the upper surface of the positive lead.
- One end of the conducting wire may be bent so that the end is parallel to the upper surface of the positive lead in order to increase the length of contact with the upper surface of the positive lead.
- the wire portion may be disposed without particular limitation as long as it can be disposed between the anode lead and the cathode lead of the electrode assembly without causing an internal short circuit.
- the conducting wire part is located outside the pouch into which the electrode assembly is inserted and can be electrically coupled with the positive lead and the negative lead protruding outside the pouch. It can be electrically coupled to the positive electrode lead and the negative electrode lead inside the pouch into which the electrode assembly is inserted.
- the conductive wire part includes a temperature sensitive part electrically connected to the negative lead by being deformed according to temperature conditions at the other end of the side electrically connected to the positive lead. Accordingly, in the secondary battery, the shape of the temperature sensitive part is deformed according to the heat generated from the electrode assembly during overcharging, so that it can be connected to the negative electrode lead.
- the temperature sensing unit may be deformed in shape when exposed to a temperature of 70°C to 100°C, specifically, 80°C to 100°C; Alternatively, the shape may be deformed upon exposure to a temperature of 75° C. to 95° C.
- the type of the temperature sensitive unit is not particularly limited as long as it can change its shape in the temperature range of 70° C. to 100° C., but specifically, nickel-titanium alloy; And copper-zinc-a shape memory alloy containing at least one of aluminum alloys;
- the temperature sensing unit may be formed of a bimetal including a first metal made of a nickel iron alloy and a second metal made of a nickel manganese iron alloy, a nickel molybdenum iron alloy, or a nickel manganese copper alloy.
- the temperature sensitive part may include a nickel-titanium alloy having excellent shape restoring ability and workability.
- the temperature sensing unit may include a first metal made of an alloy of nickel iron and a second metal made of an alloy of an alloy of nickel manganese iron.
- the voltage measurement unit is electrically connected to the middle of the conducting wire unit. That is, lead wire connection terminals may be provided at both ends of the voltage measuring unit, respectively. As long as one end of the conducting wire is connected to the positive electrode lead and the other end is connected to the temperature sensing unit arranged to contact the upper surface of the electrode assembly, the voltage measuring unit is not disposed on the electrode assembly, but may be disposed at a position spaced apart from the electrode assembly.
- a secondary battery charging device is generally provided with a voltage measuring unit for measuring the pressure between the positive electrode and the negative electrode of the electrode assembly. Therefore, the secondary battery of the present invention can be configured by connecting the positive electrode lead and the conductive wire connected to the temperature sensing unit to the previously provided voltage measuring unit.
- the voltage measuring unit continuously measures the voltage during charging, and the measured voltage value becomes zero before the temperature sensing unit is connected to the cathode lead. That is, while the secondary battery is being charged, the voltage measuring unit is continuously operated, but heat is generated due to overcharging of the secondary battery, and thus the shape of the temperature sensing unit is deformed so that the positive lead of the electrode assembly is not connected until the temperature sensing unit is connected to the negative electrode lead. Since the voltage between the and the cathode lead cannot be measured, a voltage value of zero can be obtained as a result value. In addition, when the shape of the temperature sensing unit is deformed under a high temperature condition and connected to the negative lead, the voltage measuring unit electrically connected to the middle of the conducting wire can measure the voltage between the positive lead and the negative lead.
- the voltage measurement unit may be electrically connected to the control unit, and may transmit a measured voltage value to the control unit.
- the control unit may stop charging of the secondary battery when a voltage higher than a predetermined value is measured by the voltage measuring unit.
- the temperature sensing unit when charging by connecting power to the positive lead and the negative lead of the electrode assembly, heat is generated in the electrode assembly. Since the temperature sensing unit is in contact with the upper surface of the electrode assembly, heat may be received by conduction. When the temperature of the temperature sensitive unit receives heat and rises, in particular, an end portion of the anode lead side is thermally deformed and can be connected to the anode lead at a predetermined temperature or higher. When the temperature sensing unit is connected to the cathode lead, the voltage charged in the electrode assembly until then is measured. The controller may stop charging of the secondary battery when a voltage of a predetermined value slightly greater than almost zero is measured by the voltage measuring unit. Accordingly, swelling or ignition of the secondary battery due to overcharging may be prevented.
- the voltage of the predetermined value may be 4.0V or more as a preset value, specifically 4.1V or more, 4.2V or more, 4.2 to 4.8V; or 4.2 to 4.5V.
- the secondary battery includes a lead storage battery, a nickel-cadmium (NiCd) battery, a nickel-metal hydride (Ni-MH) battery, a lithium ion (Li-ion) battery, and a lithium ion polymer (Li-ion polymer) battery.
- the secondary battery may be a lithium ion battery.
- Lithium-ion batteries are lightweight, have a large capacity, have little self-discharge, and have high voltage, occupying most of the secondary battery market. However, since lithium ion batteries may swell and explode or catch fire when overcharged, there is a greater need to prevent overcharge as in the present invention.
- a method for charging a secondary battery includes transmitting the measured voltage value to a controller and stopping charging of the secondary battery when the transmitted voltage value is greater than or equal to a predetermined value.
- the charging method of the secondary battery according to the present invention is a method of charging the secondary battery of the present invention described above, wherein the charging is performed by supplying electric power to the secondary battery of the present invention, and by the heat generated from the electrode assembly during overcharging, the secondary battery
- the voltage measuring part measures the voltage
- the temperature sensing unit in order to electrically connect the anode lead and the cathode lead, the temperature sensing unit may be deformed in shape when exposed to a temperature of 70° C. to 100° C., specifically, 80° C. to 100° C.; Alternatively, the shape may be deformed upon exposure to a temperature of 75° C. to 95° C.
- the type of the temperature sensitive unit is not particularly limited as long as it can change its shape in the temperature range of 70° C. to 100° C., but specifically, nickel-titanium alloy; And copper-zinc-a shape memory alloy containing at least one of aluminum alloys;
- the temperature sensing unit may be formed of a bimetal including a first metal made of a nickel iron alloy and a second metal made of a nickel manganese iron alloy, a nickel molybdenum iron alloy, or a nickel manganese copper alloy.
- the temperature sensitive part may include a nickel-titanium alloy having excellent shape restoring ability and workability.
- the temperature sensing unit may include a first metal made of an alloy of nickel iron and a second metal made of an alloy of an alloy of nickel manganese iron.
- the voltage measurement unit may transmit the measured voltage value to the control unit as a voltage signal, and the control unit may stop charging the secondary battery when the received voltage value is greater than or equal to a predetermined value.
- the voltage of the predetermined value may be 4.0V or more as a preset value, specifically 4.1V or more, 4.2V or more, 4.2 to 4.8V; or 4.2 to 4.5V.
- the secondary battery includes a lead storage battery, a nickel-cadmium (NiCd) battery, a nickel-metal hydride (Ni-MH) battery, a lithium ion (Li-ion) battery, and a lithium ion polymer (Li-ion polymer) battery.
- the secondary battery may be a lithium ion battery.
- Lithium-ion batteries are lightweight, have a large capacity, have little self-discharge, and have high voltage, occupying most of the secondary battery market. However, since lithium ion batteries may swell and explode or catch fire when overcharged, there is a greater need to prevent overcharge as in the present invention.
- FIG. 1 is a top view schematically showing the configuration of a secondary battery according to a first embodiment of the present invention
- FIG. 2 is a front view schematically showing the secondary battery of FIG. 1
- FIG. 3 is a shape memory that is a temperature sensitive part in FIG. It is a front view showing a state in which the alloy is deformed and connected to the negative electrode lead.
- the secondary battery 100 includes an electrode assembly 110 having a cathode lead 120 and a cathode lead 130 at both ends, and a lead part 140 having one end electrically connected to the cathode lead. ), a temperature sensing unit 150 electrically connected to the other end of the conducting wire electrically connected to the anode lead and having at least a part in contact with the electrode assembly 110, and a voltage measuring unit 160 electrically connected to the middle of the conducting wire unit and when the voltage value measured by the voltage measurement unit 160 is greater than or equal to a predetermined value as the temperature sensing unit 150 including the shape memory alloy is deformed and connected to the negative electrode lead 130, charging of the electrode assembly 110 is stopped.
- a control unit 190 is included.
- the anode lead 120 and the cathode lead 130 are disposed at both ends of the electrode assembly 110, and the conducting wire 140 is electrically connected to the anode lead 120.
- the end of the conducting wire may be connected by welding to the upper surface of the positive lead 120 .
- One end of the conductive wire 140 may be bent so that the end is parallel to the top surface of the cathode lead 120 in order to increase the contact length with the top surface of the cathode lead 120 .
- the temperature sensing unit 150 may be electrically connected to the other end of the conducting wire unit 140 .
- the temperature sensitive part 150 is not only deformed according to the temperature, but also may be made of a conductive metal through which current flows through the connection of the other end of the conductive wire part 140 .
- the temperature sensing unit 150 is a part that is deformed by receiving heat transmitted from the electrode assembly 110, and most of the temperature sensing unit 150 is the upper surface of the electrode assembly 110, except for a portion on the negative electrode lead 130 side. It can be placed in contact with.
- the voltage measuring unit 160 is electrically connected to the middle of the conducting wire 140 . That is, wire connection terminals may be provided at both ends of the voltage measuring unit 160 , respectively. As long as one end of the conducting wire 140 is connected to the positive electrode lead 120 and the other end is connected to the temperature sensing unit 150 arranged to contact the upper surface of the electrode assembly 110, the voltage measuring unit 160 is an electrode assembly. It may also be disposed at a position spaced apart from the electrode assembly 110 without being disposed on top of (110).
- the control unit 190 may stop charging of the electrode assembly 110 when a voltage equal to or higher than a predetermined value is measured by the voltage measurement unit 160 .
- a voltage equal to or higher than a predetermined value is measured by the voltage measurement unit 160 .
- heat is generated in the electrode assembly 110. Since the temperature sensing unit 150 is in contact with the upper surface of the electrode assembly 110, it can receive heat by conduction. When the temperature of the temperature sensing unit 150 increases by receiving heat, the end portion of the negative electrode lead 130 is thermally deformed and can be connected to the negative electrode lead 130 at a predetermined temperature or higher.
- the voltage measuring unit 160 continuously measures the voltage during charging, and the measured voltage value becomes zero before the shape memory alloy unit 150 is connected to the negative lead 130. Then, when the temperature sensing unit 150 is connected to the cathode lead 130, the voltage charged in the electrode assembly 110 until then is measured.
- the control unit 190 controls the voltage of a predetermined value slightly greater than almost zero in the voltage measurement unit 160, for example, 4.2 to 4.5V; Alternatively, when 4.2 to 4.3V is measured, charging of the electrode assembly 110 may be stopped. Accordingly, swelling or ignition of the secondary battery due to overcharging may be prevented.
- the temperature sensing unit 150 may receive heat from the electrode assembly 110 and be deformed at a temperature of 80 to 100° C. to be connected to the negative electrode lead 130 .
- the temperature sensing unit 150 is not connected to the cathode lead 130 even if it is deformed at a temperature between room temperature and less than 80°C, and when it reaches a temperature of 80 to 100°C, the temperature sensing unit 150 is deformed and the negative electrode It starts to be connected to lead 130.
- Shape memory alloy refers to an alloy that has the property of returning to its original shape by heating even after being deformed into a different shape.
- the temperature sensing unit 150 may be manufactured by molding the original shape as shown in FIG. 3 and pressing it into a substantially rectangular plate shape at room temperature. When the temperature sensing unit 150 is heated to 80 to 100° C., it is deformed into an original bent shape so that the temperature sensing unit 150 can be connected to the negative electrode lead 130 .
- the temperature sensing part 150 may be made of a nickel-titanium alloy.
- Representative shape memory alloys include nickel-titanium alloys and copper-zinc-aluminum alloys.
- Nickel-titanium alloy has the disadvantage of high cost of nickel and titanium, but it has excellent shape recovery ability and processability, so it is better than copper-zinc-aluminum alloy.
- the conductor 140 is connected to the anode lead 120 and the temperature sensing unit 150 is deformed and connected to the cathode lead 130, but the conductor 140 is connected to the cathode lead 130.
- the temperature sensing unit 150 may be deformed and connected to the anode lead 120.
- the secondary battery according to the first embodiment of the present invention when the voltage is measured using the temperature sensing unit and the voltage measuring unit, overcharging can be prevented in advance by stopping charging.
- FIG. 4 is a front view schematically showing the configuration of a secondary battery according to a second embodiment of the present invention
- FIG. 5 is a front view showing a state in which the temperature sensitive part including the bimetal is deformed and connected to the negative electrode lead in FIG. 4 .
- the secondary battery according to the second embodiment of the present invention includes an electrode assembly 110 having a positive electrode lead 120 and a negative electrode lead 130 at both ends, a conducting wire 140 electrically connected to the positive lead, a positive lead and A temperature sensing unit including a temperature sensing unit 170 electrically connected to the other end of the electrically connected wire unit and having at least a part of it in contact with the electrode assembly, a voltage measuring unit 160 electrically connected to the middle of the wire unit, and a bimetal.
- the controller 190 stops charging the electrode assembly 110 when the voltage value measured by the voltage measuring unit 160 is greater than or equal to a predetermined value when the electrode 170 is deformed and connected to the negative electrode lead 130.
- the secondary battery of the second embodiment is different from the first embodiment in that the temperature sensitive part 170 includes a bimetal instead of a shape memory alloy part. Therefore, the configuration of the temperature sensing unit 170 including the bimetal will be mainly described below.
- the temperature sensing unit 170 may be electrically connected to the other end of the conductive wire 140 , one end of which is connected to the anode lead 120 . When the electrode assembly 110 is charged, the temperature sensing unit 170 receives heat from the electrode assembly 110 and is deformed so as to be connected to the negative electrode lead 130 . At least a portion of the temperature sensing unit 170 may be disposed to contact the electrode assembly 110 so as to receive heat from the electrode assembly 110 by conduction.
- Bimetal is made by overlapping and welding two different thin metal plates to form a single band.
- the length of expansion is different depending on the change in temperature, so it bends to one side.
- the temperature sensitive unit 170 including the bimetal may receive heat from the electrode assembly 110 and be deformed at a temperature of 80 to 100° C. to be connected to the negative electrode lead 130 .
- the temperature sensing unit 170 may be manufactured to be deformed at a temperature of 80 to 100° C. and connected to the negative electrode lead 130 according to the shape and thermal expansion coefficient of the two metal materials.
- a temperature of 80 to 100 ° C can be seen as a temperature just before overcharging in a lithium ion battery among secondary batteries.
- the temperature sensing unit 170 may include a first metal 172 made of an alloy of nickel iron and a second metal 174 made of an alloy of nickel manganese iron, an alloy of nickel molybdenum iron, or an alloy of nickel manganese copper. ) may be included.
- the first metal 172 is a metal having a smaller coefficient of thermal expansion than the second metal 174 and may be formed of an alloy including nickel and iron.
- the second metal 174 is a metal having a higher coefficient of thermal expansion than the first metal 172 and may be formed of a nickel manganese iron alloy, a nickel molybdenum iron alloy, or a nickel manganese copper alloy.
- the temperature sensing unit 170 is shown as being disposed on the upper surface of the electrode assembly 110, but the bimetal 170 may be disposed to contact the lower surface of the electrode assembly 110. Since the second metal 174 is a metal having a higher coefficient of thermal expansion than the first metal 172 , it is more efficient for the second metal 174 to contact the electrode assembly 110 and directly receive heat.
- power is connected to the positive electrode lead 120 and the negative electrode lead 130 of the electrode assembly 110, and charging is performed by supplying power.
- the voltage is measured with the voltage measuring unit 160 connected to the middle of the conducting wire having one end connected to the anode lead 120 and the other end connected to the temperature sensing unit 150 or 170.
- the temperature sensing unit 150 or 170 may include the shape memory alloy of the first embodiment or the bimetal of the second embodiment. At least a portion of the temperature sensitive part 150 including the shape memory alloy may be connected to the negative lead 130 as it is deformed by receiving heat from the electrode assembly 110 in contact with the electrode assembly 110 . At least a portion of the temperature sensing unit 170 including a bimetal is in contact with the electrode assembly 110 to receive heat from the electrode assembly and is deformed, so that it may be connected to the negative electrode lead 130 .
- the voltage measuring unit 160 may continuously measure the voltage after charging starts and transmit a voltage signal to the controller 190 .
- the temperature sensing unit 150 or 170 receives heat from the electrode assembly 110 during charging of the electrode assembly 110 and is deformed, and when it reaches a temperature of 80 to 100 ° C., it can be connected to the negative electrode lead 130. . Accordingly, the voltage value measured by the voltage measurement unit 160 increases from zero to a predetermined value or more, and the controller 190 may stop charging the electrode assembly 110 when the voltage signal is received.
- control unit 190 control unit
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Abstract
Description
Claims (11)
- 양단부에 양극 리드와 음극 리드를 구비하는 전극 조립체;상기 양극 리드에 일단이 전기적으로 연결되는 도선부; 및상기 도선부의 중간에 전기적으로 연결되는 전압측정부;를 포함하고,상기 도선부는 양극 리드와 전기적으로 연결된 측의 타단에 도입되어 온도 조건에 따라 양극 리드와 음극 리드를 전기적으로 연결하는 온도감응부를 포함하는 이차전지.
- 제1항에 있어서,온도감응부는 70℃ 내지 100℃의 온도 노출 시 형태가 변형되어 양극 리드와 음극 리드를 전기적으로 연결하는 이차전지.
- 제1항에 있어서,온도감응부는 니켈 티탄 합금을 포함하는 형상기억합금으로 구성되는 이차전지.
- 제1항에 있어서,온도감응부는 니켈 철의 합금으로 이루어진 제1 금속과 니켈 망간 철의 합금, 니켈 몰리브덴 철의 합금, 또는 니켈 망간 구리의 합금으로 이루어진 제2 금속을 포함하는 바이메탈로 구성되는 이차전지.
- 제1항에 있어서,전압측정부는 온도감응부의 변형에 의해 도선부가 음극 리드에 접속되는 경우 양극 리드와 음극 리드 사이의 전압을 측정하는 이차전지.
- 제1항에 있어서,이차전지는 전압측정부와 전기적으로 연결되어 전압측정부에서 측정된 전압값을 전송받는 제어부를 포함하는 이차전지.
- 제6항에 있어서,제어부는 전압측정부에서 전송받은 전압값이 소정값 이상이면 이차전지의 충전을 중단시키는 이차전지.
- 제1항에 따른 이차전지에 전력을 공급하여 충전하는 단계;상기 이차전지에 구비된 도선부의 온도감응부가 음극 리드에 전기적으로 접속되면 전압측정부로 전압을 측정하는 단계;측정된 전압값이 소정값 이상이면 이차전지의 충전을 중지하는 단계를 포함하는 이차전지의 충전방법.
- 제8항에 있어서,온도감응부는 70℃ 내지 100℃의 온도 노출 시 형태가 변형되어 양극 리드와 음극 리드를 전기적으로 연결하는 이차전지의 충전방법.
- 제8항에 있어서,온도감응부는 니켈 티탄 합금을 포함하는 형상기억합금으로 구성되는 이차전지의 충전방법.
- 제8항에 있어서,온도감응부는 니켈 철의 합금으로 이루어진 제1 금속과 니켈 망간 철의 합금, 니켈 몰리브덴 철의 합금, 또는 니켈 망간 구리의 합금으로 이루어진 제2 금속을 포함하는 바이메탈로 구성되는 이차전지의 충전방법.
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JP2023536542A JP2024503979A (ja) | 2021-11-02 | 2022-10-14 | 過充電防止が可能な二次電池およびその充電方法 |
US18/267,059 US20240055875A1 (en) | 2021-11-02 | 2022-10-14 | Secondary battery capable of preventing overcharge, and charging method thereof |
CN202280008386.3A CN116670890A (zh) | 2021-11-02 | 2022-10-14 | 能够防止过充的二次电池及二次电池的充电方法 |
EP22890214.4A EP4246705A1 (en) | 2021-11-02 | 2022-10-14 | Secondary battery capable of preventing overcharge, and charging method thereof |
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KR1020210149067A KR20230063714A (ko) | 2021-11-02 | 2021-11-02 | 과충전 방지가 가능한 이차전지 및 이의 충전방법 |
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CN117706378A (zh) * | 2024-02-05 | 2024-03-15 | 常州拜特测控技术有限公司 | 一种液流电池充放电性能测试方法、系统及存储介质 |
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- 2022-10-14 WO PCT/KR2022/015597 patent/WO2023080479A1/ko active Application Filing
- 2022-10-14 JP JP2023536542A patent/JP2024503979A/ja active Pending
- 2022-10-14 CN CN202280008386.3A patent/CN116670890A/zh active Pending
- 2022-10-14 EP EP22890214.4A patent/EP4246705A1/en active Pending
- 2022-10-14 US US18/267,059 patent/US20240055875A1/en active Pending
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US20240055875A1 (en) | 2024-02-15 |
EP4246705A1 (en) | 2023-09-20 |
CN116670890A (zh) | 2023-08-29 |
JP2024503979A (ja) | 2024-01-30 |
KR20230063714A (ko) | 2023-05-09 |
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