Abstract: A flow imaging and monitoring system for synchronized management of wide area drainage that includes an interposer for supporting monitoring and management equipment in a manhole, a module for illuminating water flowing in pipes at the base of the manhole, a module for monitoring responses to reflected light, a sealed and rechargeable battery pack, and a data analysis and management system to interpret data streams in real time. The interposer can be adjusted to fit the diameter of the manhole and can be adjusted to be placed under the manhole cover. The module for illuminating the flowing water can be adjusted to generate various frequencies. The support structures for the modules can be adjusted for varying pitch, roll and yaw with respect to the manhole. The data analysis and management system is supported by cloud computing.

Abstract: A rechargeable battery includes an electrode assembly for charging and discharging, a case in which the electrode assembly is stored; an electrode terminal electrically connected to the electrode assembly; a current collecting portion that electrically connects the electrode assembly with the electrode terminal, the current collecting portion including a fuse portion; and an insulation portion that insulates the fuse portion, the insulation portion being slidable in response to pressure applied in the fuse portion.

Abstract: A Pump-free lithium ion liquid flow battery, battery reactor and preparation method of electrode suspension solution. The Pump-free lithium ion liquid flow battery includes a positive electrode liquid preparation tank (27), a negative electrode liquid preparation tank (32), a positive electrode liquid collection tank (30), a negative electrode liquid collection tank (35), a positive electrode conveying tank (31), a negative electrode conveying tank (36) and several battery sub-systems. The positive electrode conveying tank (31) intermittently moves vertically to and fro for the transportation of positive electrode suspension solution between the positive electrode liquid collection tank (30) and the positive electrode liquid preparation tank (27). The negative electrode conveying tank (36) intermittently moves vertically to and fro for the transportation of negative electrode suspension solution between the negative electrode liquid collection tank (35) and the negative electrode liquid preparation tank (32).

Abstract: An energy storage device includes an electrode assembly, a case, a terminal part, and a current collector, wherein the terminal part has: an external terminal having at least a part exposed to outside of the case; a conduction member configured to make the external terminal and the current collector conductive; a decoupling mechanism configured to decouple the conduction member, or hinder a conduction state of the conduction member; and an auxiliary terminal disposed spaced from the external terminal, and having at least a part exposed to the outside of the case, the auxiliary terminal being electrically connected to the current collector.

Abstract: Secondary battery reuse method in which, when used secondary battery packs G and A in a lithium secondary battery have become unusable, the resistances and capacities of a plurality of secondary battery stacks constituting the secondary battery pack G are measured and a reusable secondary battery stack is selected and separated therefrom by comparing these measured resistances and capacities with a resistance threshold value H and a capacity threshold value I, respectively. In addition, a new secondary battery pack is rebuilt (constructed) by combining the secondary battery stack with a secondary battery stack that has been determined to be reusable in the secondary battery pack A in the same manner as in the secondary battery pack G.

Abstract: A rechargeable battery includes an electrode assembly; a case housing the electrode assembly; and an electrode connection assembly electrically coupled to the electrode assembly, the electrode connection assembly including: a terminal; a current collector electrically coupled to the electrode assembly; an insulating member between the terminal and the current collector, wherein a portion of the insulating member is spaced from the terminal and the current collector; and a connection member electrically coupling the terminal and the current collector, the connection member including a fuse part, wherein the portion of the insulating member overlaps with the connection member.

Abstract: Cap assembly, coupled to an open end of a battery can free from a beading portion, includes a top cap at an uppermost portion in a protrusive form forming a cathode terminal, a safety element below the top cap contacting the top cap, a safety vent contacting the safety element, a gasket surrounding outer circumferences of top cap, the safety element and vent, a cover surrounding the gasket so the top cap, safety element and vent adhere to each other, and a welding member at an upper portion of the cover having an outer end protruding more outwards than the outer end of the cover placed on the open end of the battery can, the welding member having a first notch at an upper surface thereof, protruding more than the outer end of the cover, and welded to the open end of the battery can where first notch is formed.

Abstract: A method for controlling regenerative braking of an automobile micro-hybrid system is disclosed. The system includes at least a rotary electrical machine and an electrochemical battery. The method includes a step, when the electrochemical battery has a first predetermined energy state, which corresponds to an initial optimum charging state, of commanding a reduction of the first energy state, to a second energy state corresponding to an intermediate charging state, so as to make a charging capacity available in the electrochemical battery during a subsequent opportunity for recovery of electrical energy during, for example, a braking phase of the vehicle.

Abstract: A rechargeable battery according to the present invention includes an electrode assembly that includes a positive electrode, a negative electrode, and a separator between the positive electrode and the negative electrode, a case that contains the electrode assembly and a cap assembly that is connected to the case. The positive electrode includes a current collector and a positive active material layer that includes an NCM-based positive active material disposed at the collector. The cap assembly includes a vent plate having a notch, and a current interrupt portion that interrupts electrical connection in a case of an increase in pressure inside the case. When a current interrupt pressure of the current interrupt portion is “A,” a vent fracture pressure at which the vent plate fractures at the notch is “B,” and the capacity of the rechargeable battery is “X,” they satisfy a formula of A/B=1.22?0.39X+D (?0.08?D?0.08).

Abstract: In a battery pack for an electric car, a plurality of battery modules are mounted to be divided between the front and rear of a middle cross member and a main switch and a junction board are disposed in the front and rear of the middle cross member respectively. A bent part of a second high voltage cable, which bends into a U-shape and pass through beneath the middle cross member, is held by a cable holder and fixed to a fixing part. Since only a bus bar disposed in the intermediate part of the first high voltage cable is bent into a U-shape and passed through beneath the middle cross member, not only is a wiring operation of the first high voltage cable easy, but it is also possible to minimize the length of the bus bar to thus enhance the reliability with respect to vibration.

Abstract: A rechargeable battery cell has at least one energy-optimized cell unit and at least one power-optimized cell unit. The power-optimized cell unit is configured in such a way that it can be used to generate a higher power than with the energy-optimized cell unit. The energy-optimized cell unit is configured in such a way that it can be used to store a higher quantity of energy per volume of the energy-optimized cell unit and/or per mass of the energy-optimized cell unit than with the power-optimized cell unit. The at least one energy-optimized cell unit and the at least one power-optimized cell unit are arranged in a common cell housing.

Abstract: Checking a sleep mode of a cell supervision circuit of a lithium-ion rechargeable battery having at least one electrochemical cell, while a sleep mode is set by a control device of the rechargeable battery for the cell supervision circuit, wherein, according to the method, the sending of a sleep command of the control device to the cell supervision circuit is connected to a confirmation request to the cell supervision circuit, and, in the event of non-receipt of a confirmation from the cell supervision circuit, the control device sends the sleep command and/or the confirmation request again after a time interval.

Abstract: Effecting a sleep mode of a cell supervision circuit of a rechargeable battery, in which the cell supervision circuit is not in the sleep mode after at least one sleep command sent to the cell supervision circuit, and in which a command for a software reset of the cell supervision circuit is sent to the cell supervision circuit after confirmation of the sleep mode is absent.

Abstract: The disclosed embodiments provide a battery pack that includes a fault-monitoring mechanism for detecting faults in the battery pack and indicating the faults to a user. The battery pack also includes a battery cell and enclosure material that encloses the battery cell. The fault may correspond to penetration of the battery pack, a puncture in the enclosure material, a short circuit within the battery cell, and/or a change in pressure within the battery pack. To detect the fault, the fault-monitoring mechanism may utilize a conductive mechanism, a color-changing mechanism, and/or a sensor mechanism in the battery pack.

Abstract: An electricity accumulation device includes an electricity accumulation element, an outer jacket material configured to house the electricity accumulation element, and a deformation sensor disposed on an expansive surface of the outer jacket material. The deformation sensor includes a sensor membrane having a base material made of an elastomer or a resin and conductive fillers filling the base material, the sensor membrane being subjected to bending deformation along with expansion of the outer jacket material, and a pair of electrodes connected to the sensor membrane. A three-dimensional conductive path is formed in the sensor membrane through contact between the conductive fillers. An electric resistance is increased along with an increase in amount of deformation of the sensor membrane from a natural state. The electricity accumulation device senses expansion of the outer jacket material on the basis of variations in electric resistance along with bending deformation of the sensor membrane.

Abstract: A rechargeable battery according includes a plurality of electrode assemblies including a first electrode assembly and a second electrode assembly, a case housing the plurality of electrode assemblies, a cap assembly coupled to the case, and a first safety member including a first conductive plate between the first electrode assembly and the case, a second conductive plate between the second electrode assembly and the case, and a safety fuse between the first conductive plate and the second conductive plate and coupling the first and second conductive plates together.

Abstract: A rechargeable battery includes an electrode assembly; a case accommodating the electrode assembly therein; a cap plate configured to close and seal an opening of the case; first and second electrode terminals extending through the cap plate and electrically coupled to the electrode assembly; and an external short-circuiter configured to electrically isolate or short-circuit the cap plate and the first terminal from or to each other, the cap plate being electrically coupled to the second electrode terminal. The external short-circuiter includes a membrane configured to close and seal a short-circuit opening in the cap plate, a short-circuit tab electrically coupled to the first electrode terminal and located at a side of the membrane, and the short-circuit tab includes a short-circuit protrusion, the short-circuit protrusion being configured to be separated from or short-circuited to the membrane. The membrane and the short-circuit protrusion have substantially the same resistivity.

Abstract: A current interruption device includes: a deforming plate configured to deform when the internal pressure of the casing rises above the predetermined level; a conducting plate which configures the current path; and a contact plate. The conducting plate includes a first contact portion configured to contact the contact plate. The contact plate includes a second contact portion configured to contact the first contact portion. The deforming plate includes a pressure receiving portion configured to receive the internal pressure of the casing and a contacting portion configured to contact the first contact portion. The second contact portion is configured to be separated from the conducting plate by deformation causing the contacting portion to move toward the contact plate. The deforming plate is insulated from the conducting plate and the contact plate. The conducting plate is disposed to be interleaved between the deforming plate and the contact plate.

Abstract: An assembled battery module includes battery cells connected in series, resistors, a voltage measuring unit, failure detection switches, and a control unit. Each resistor is connected between a positive or negative electrode of the corresponding battery cell and a corresponding node for the positive or negative electrode. Each failure detection switch is connected between the two nodes corresponding to positive and negative electrodes of a battery cell to allow on-off switching between the two nodes. The control unit detects a disconnection between a positive or negative electrode of a battery cell to a corresponding node based on first and second voltages measured between two nodes, the first voltage being measured when one of the two failure detection switches connected to the corresponding node is switched from on to off and the second voltage being measured when the other failure detection switch is switched from on to off.

Abstract: A rechargeable battery includes: an electrode; a case accommodating the electrode assembly therein; a cap plate closing an opening of the case; a first electrode terminal and a second electrode terminal extending through the cap plate and coupled to the electrode assembly; and an external short-circuiter including a membrane closing and sealing a short-circuit opening in the cap plate and coupled to the second electrode terminal, and a short-circuit tab coupled to the first electrode terminal and separated from the membrane, wherein the cap plate includes a bending inducement groove formed at the second electrode terminal.

Abstract: An electronic cigarette comprising a battery pole and an atomizer is provided, the battery pole includes a battery and a control module, and the atomizer includes an identification signal generation module and an atomizing module; the identification signal generation module is configured for sending an identification signal to the control module by wired transmission or wireless transmission; the control module is configured for determining whether the atomizer matches with the battery pole basing on whether the identification signal is received or whether the identification signal is correct, and controlling the battery to be electrically connected with or to be electrically isolated from the atomizing module according to the determining result. The case that different kinds of tobacco juices with different tastes may be mixed together, and the case that battery poles and atomizers provided by different manufacturers may be randomly assembled together can be avoided.

Abstract: A lithium ion battery comprises a shell, a cell disposed in the shell, and two lugs connected to the cell. Each of the lugs comprises a conductive foil with a surface and a PTC layer disposed on the surface of the conductive foil. The lugs conduct currents between the lithium ion battery and an outer circuit.

Abstract: A battery module may include a housing, a plurality of battery cells disposed in the housing, a battery terminal extending from the battery module for coupling the battery module with electrical components in the vehicle, and a contactor. A voltage supplied to a relay coil in the contactor may generate a magnetic field to actuate a contactor switch. The battery module may also include a printed circuit board (PCB) disposed in the housing. The PCB may include a relay control circuit configured to control a current flowing across the relay coil, and the relay control circuit may operate in a pull-in mode to transition the contactor switch into a closed position and in a hold mode to maintain the contactor switch in the closed position.

Abstract: A battery system having a bladed fuse connector and a method of operation of the bladed fuse connector are provided. The system may, in certain embodiments, include a printed circuit board (PCB) and a high current interconnect. The high current interconnect may be mounted to and extending upward from the PCB. The battery system may also include a fuse. The fuse may limit an amount of current flowing through the battery system. Additionally, the battery system may include a bladed fuse connector coupled between the high current interconnect and the fuse. The bladed fuse connector may carry a current between the high current interconnect and the fuse. To that end, the bladed fuse connector may include an S-shaped bend between the high current interconnect and the fuse.

Abstract: A rechargeable battery includes an electrode assembly including a first electrode and a second electrode, a case configured to store the electrode assembly, a cap plate attached to the case, a terminal electrically connected to the first electrode and protruding out of the cap plate, a current collecting member connecting the first electrode with the terminal, the current collecting member including a fuse portion, a lower insulating member between the cap plate and the current collecting member, and a barrier between the lower insulating member and the fuse portion.

Abstract: A rechargeable battery includes an electrode assembly including a first electrode and a second electrode; a case accommodating the electrode assembly; a cap plate coupled to the case; a terminal electrically connected to the first electrode and protruding out of the cap plate; a short-circuit member at a short-circuit opening in the cap plate and configured to deform to electrically connect the first electrode and the second electrode; and a blocking member below the short-circuit opening and having a plurality of openings.

Abstract: A dual-contact battery pack comprises a housing, a plurality of battery cells located within the housing, a first set of contacts and a second set of contacts coupled to the housing and to the plurality of battery cells. The dual-contact battery further comprises a first control circuit coupled between the plurality of battery cells and the first set of contacts and a second control circuit coupled between the plurality of battery cells and the second set of contacts. The first and second sets of contacts enable the dual-contact battery pack to selectively switch from a first state which prevents current from flowing from the plurality of battery cells to the respective first and second set of contacts to a second state in which current flows from the plurality of battery cells to the respective first and second set of contacts in response to the respective first and second control circuits.

Abstract: A rechargeable battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a case housing the electrode assembly; and a cap assembly coupled to the case, wherein the cap assembly includes a cap plate sealing the case and having a short circuit opening; a first short circuit plate installed at the short circuit opening of the cap plate; a second short circuit plate on an exterior of the cap plate and spaced from the cap plate to cover the short circuit opening; and a sealing layer between the second short circuit plate and the cap plate.

Abstract: A battery pack for a use with a powered surgical tool. The battery pack may include a housing with an outer wall and opposing first and second ends. The housing may include an elongated shape that extends between the first and second ends. A first member may extend across the first end of the housing and include a first aperture, and a second end member may extend across the second end of the housing and may include a second aperture. A passage may extend through the housing with a first end that aligns with the first aperture and a second end that aligns with the second aperture. The housing may be sized for a plurality of storage locations positioned between the first and second members and around the passage, and each of the storage locations may be configured to store a power cell.

Abstract: The invention relates to a HV-battery, in particular a traction battery for a vehicle, having a plurality of cell modules which each comprise a plurality of cells, wherein each cell module is assigned a controller for cell monitoring and/or for cell balancing, wherein the controllers are connected to a battery management control device for communication or open-loop control and/or closed loop control purposes, wherein the HV-battery is of modular construction by configuring the cell modules as plug-in modules that are detachably mountable or can be mounted to a printed circuit board.

Abstract: A rechargeable battery module includes a plurality of unit cells each including a rechargeable battery, a first electrode terminal, and a second electrode terminal; a bus bar coupling adjacent ones of the plurality of unit cells; a first module terminal coupled to the first electrode terminal of one of the plurality of unit cells at one side of the unit cells; a second module terminal coupled to the second electrode terminal of an other one of the plurality of unit cells at an opposite side of the unit cells; and a module short-circuit member coupled to the first module terminal or the second module terminal, separated from the other module terminal, and configured to contact the other module terminal according to temperature.

Abstract: A vehicle is disclosed comprising a battery and a controller. Projected battery impedance parameters are calculated based on predetermined parameter values and historical parameter values generated by a battery parameter estimation model. The values may be weighted according to time data associated with the historical impedance parameter values and a temperature of the battery. Recent historical impedance parameter values may affect the projected battery impedance parameter values more than older historical impedance parameter values. The model is initialized with projected parameter values at vehicle initialization. Battery power capability is calculated using the projected parameter values for a period of time following vehicle initialization. After the period of time following vehicle initialization, battery power capability is calculated using impedance parameters generated by the model. The period of time following vehicle initialization may end when the model output has converged to a stable solution.

Abstract: A battery comprises a plurality of battery modules, a plurality of monitoring units with a respective monitoring unit connected to a battery module, a battery control unit, and a first communication network to which the monitoring units are connected. The first communication network is configured to transmit data from or to the battery control unit. Furthermore, the battery comprises a second communication network configured to transmit an activation signal for activating a monitoring unit to a further monitoring unit.

Abstract: A flex circuit system according to an exemplary aspect of the present disclosure includes, among other things, a substrate, at least one bus bar mounted to the substrate and at least one voltage sense lead integrated with the substrate.

Abstract: Pressure response devices, systems, and associated methods. The pressure response device includes a flange portion, a central portion, and an angled frustum portion provided between the flange portion and the central portion, with the angled frustum potion configured to activate upon experiencing a predetermined pressure differential. Pressure response systems may include a projection, a conductive arch, or a photo emitter configured to indicate a response to the predetermined pressure differential. Pressure response device may be a battery device, with the pressure response member configured to form part of an electrical conducting path until a predetermined pressure condition is reached.

Abstract: The present disclosure teaches a method, system, and apparatus for the mitigation of internal shorting for improved battery safety. In one or more embodiments, the disclosed method for mitigating internal shorting in a battery involves sensing, with at least one sensor, an internal shorting condition of the battery. The method further involves producing, by at least one processor, at least one commanding signal to initiate motion of a filament breaking mesh. Also, the method involves moving, by at least one drive mechanism, the filament breaking mesh, upon receiving at least one commanding signal. Further, the method involves breaking, with the filament breaking mesh, at least one filament present within the battery.

Abstract: Disclosed herein is a middle- or large-sized battery module comprising: a battery cell stack including a plurality of battery cells or unit modules electrically connected with each other; a first module case constructed in a structure to entirely surround one side end of the battery cell stack and to partially surround the upper and lower ends of the battery cell stack; a second module case coupled with the first module case, the second module case being constructed in a structure to entirely surround the other side end of the battery cell stack and to partially surround the upper and lower ends of the battery cell stack; a sensing member mounted to the first module case or the second module case; and a battery management system (BMS) mounted to the first module case or the second module case.

Abstract: Formation of metallic dendrites within a battery can lead to catastrophic batten failure in some instances. Methods for monitoring for the presence of metallic dendrites within a battery can include measuring the electric field within the battery's separator material over a period of time. Batteries containing an electric field sensor on or in their separator material can be fabricated and their operation regulated in the event of dendrite formation. The electric field sensor is configured to detect an electric field in the separator material.

Abstract: An electric or hybrid vehicle including an arrangement of mechanisms introducing an extinguishing fluid into a battery pack, especially a drive battery, of the vehicle. A first port is placed in a wall of the pack and provides access to an interior of the pack, the first port including a partial or total blocking mechanism being removable or meltable under effect of temperature. A second port is placed in an element of a body of the vehicle facing the first port. Extinguishing fluid may be introduced into the pack through two ports once the blocking mechanism of the first port has been removed or melted.

Abstract: A battery pack having one or more battery cells, a shell enclosing the one or more battery cells, wherein at least part of the shell is separated in space with one or more battery cells, and a fire preventing and restricting agent placed between the shell and one or more battery cells. The fire preventing and restricting agent includes thermally expandable agent which is capable of preventing, retarding and/or extinguishing a fire in the battery pack by filling the space between the shell and one or more battery cells.

Abstract: A battery pack having a can housing having an electrode assembly and electrolyte, this can may include a cap plate coupled to an open end of the can. A recess is provided on a surface of the cap plate. A metal plate made of a material different from the cap plate is embedded in the recess. The metal plate includes a plurality grooves on at least one surface.

Abstract: A cell housing, such as for a backpack battery pack, includes a first wall, a second wall, and a cell retention structure there-between, wherein the cell retention structure is configured to retain battery cells arranged in a matrix of rows and columns such that the longitudinal axis of each battery cell is substantially parallel to the longitudinal axes of the other battery cells. A plurality of connectors are located on the exterior of the cell housing and are electrically connected to the battery cells through openings in the first and second walls of the cell housing. The connectors electrically connect the cells in each row in parallel and the cells in each column in series. The connectors may comprise unitary connectors that electrically connect the positive terminals of at least two cells of one row of cells to each other and also to the negative terminals of at least two cells of another row of cells.

Abstract: A battery system includes a connector electrically connecting, in parallel, three or more battery cells, where the connector includes a fuse integrally formed therein at least between a first one or more cells in the group of cells and a second one or more cells in the group of cells. The connector may be a unitary piece of conductive material that has a cross sectional area that narrows between each cell to form a fuse between each of the three or more battery cells and/or narrows between pairs of the three or more battery cells. Each fuse's cross-sectional area is dimensioned so as to disconnect the cell(s) on one side of the fuse from the cell(s) on the other side of the fuse, thereby preventing a thermal runaway event. A battery pack comprising this battery system may have an external fuse that responds to a short circuit occurring external to the battery system before the connector's fuses do.

Abstract: A battery includes: battery cell groups, each of which is obtained by connecting battery cells in series to each other; a battery casing storing the battery cells; a bus-bar connecting positive electrodes of the respective battery cell groups; a bus-bar connecting negative electrodes of the respective battery cell groups; and a first line connecting the positive electrode and the bus-bar, a second line connecting the negative electrode and the bus-bar, and a third line connecting the battery cells included in each of the battery cell groups. The first line and the second line are drawn to the outside of the battery casing and connected to the bus-bar, and the corresponding first and second lines are bent at the outside of the battery casing according to a position of the battery cell group in the battery casing and are connected to the bus-bar.

Abstract: A control system includes an electrical power source and an alternating current (AC) power supply electrically coupled with the electrical power source. An uninterruptable power supply is electrically coupled with the AC power supply for storing and returning electrical energy supplied by the AC power supply. The uninterruptable power supply includes multiple battery modules. Each battery module includes a battery cell and a battery monitor configured to monitor the battery cell. Each battery module also includes a controller operatively coupled with the battery modules. The controller is configured to receive diagnostic information from the battery modules. The uninterruptable power supply can also include one or more authentication modules to participate in an authentication sequence between two or more of a battery module, the controller, a device to be coupled with the uninterruptable power supply, an action originator in the control system, and so forth.

Abstract: A battery pack includes: a battery unit in which a plurality of battery modules with a plurality of secondary batteries connected in series to each other is connected in parallel to each other so that output current; and a battery management unit. The battery management unit calculates a first allowable current value of each of the plurality of battery modules and calculates second allowable current values of the other battery modules based on the first allowable current value of one battery module from the plurality of battery modules. The battery management unit calculates a value corresponding to the sum of the first allowable current value used as the reference and the respective second current values as an allowable current value when each of the second allowable current values is equal to or smaller than the first allowable current value of the corresponding battery module.

Abstract: A rechargeable battery including an electrode assembly; a terminal; and a current collector electrically connecting the electrode assembly and the terminal, the current collector including a first fuse for a first current and a second fuse for a second current, the first current being different from the second current.

Abstract: Embodiments of the present invention are directed to an improved battery packaging design. The battery pack design may include a battery cell, a plurality of transistors, and a controller. The transistors may be coupled to the terminals of the battery cell in an H-bridge configuration. The controller may control the transistors to bypass the battery cell based on the current flowing between the output terminals of the battery pack. In such a manner, the controller may prevent damage to the battery cell and improve the overall safety of the battery pack in hazardous conditions.

Abstract: Embodiments of the present invention are directed to improved battery packaging designs. The battery pack design may include a battery cell, a plurality of transistors, and a controller. The transistors may be coupled to the terminals of the battery cell in an H-bridge configuration. The controller may control the transistors to bypass the battery cell based on the current flowing between the output terminals of the battery pack. In such a manner, the controller may prevent damage to the battery cell and improve the overall safety of the battery pack in hazardous conditions. Moreover, the design may allow for more efficient charging/discharging of the cells that are most ready to accept/supply current.

Abstract: An overcurrent shut-off device according to an exemplary embodiment of the present disclosure includes a switching unit connected to both ends of a secondary battery, the switching unit being turned on by pressure caused by a swelling phenomenon occurring in the secondary battery, and a fusing unit, as a component installed on a path of an electric current flowing through the secondary battery, being ruptured when the switching unit is turned on, to interrupt the electric current flowing through the secondary battery. According to an aspect of the present disclosure, by a turn-on operation in response to a swelling phenomenon of a secondary battery caused by a short circuit and the like, a connecting component installed on a path of an electric current flowing through a secondary battery is ruptured quickly to interrupt an overcurrent, thereby ensuring safety of the secondary battery in use.