Abstract: A battery pack includes a plurality of cells, a chamber adjacent to the plurality of cells, and a pressure sensor in the chamber to detect an internal pressure of the chamber, wherein each of the cells includes a first vent hole to open to exhaust a cell internal pressure to an exterior of the cell when the cell internal pressure is equal to or greater than a first pressure level, and a second vent hole to open to exhaust the cell internal pressure into the chamber when the cell internal pressure is equal to or greater than a second pressure level, the first pressure level being higher than that the second pressure level.

Abstract: An embodiment of the present invention provides a battery management system including an insulation resistance estimator configured to estimate insulation resistance corresponding to internal temperature and pressure of a battery pack to obtain an estimated value of the insulation resistance, a concentration estimator configured to estimate an internal gas concentration of the battery pack corresponding to the estimated value of the insulation resistance, a cell failure detector configured to detect whether a plurality of battery cells fail based on a state of charge (SOC) and a voltage of the plurality of battery cells accommodated in the battery pack, and a leak determiner configured to determine whether a battery cell leaks based on a detected result of the cell failure detector and based on the internal gas concentration corresponding to the estimated value of the insulation resistance.

Abstract: An electrical connector includes a lower body with terminal holes, an inflator between the terminal holes in the lower body, an upper body, and a cover, The upper body is on the lower body and includes an opening corresponding to at least one of the terminal holes and a pair of metal holders electrically connected to each other. The cover covers the upper body and includes an end portion coupled to the lower body. An inner surface of the cover faces a top surface of the upper body and includes a space that is separated from the top surface.

Abstract: A rechargeable battery charging apparatus includes a battery module including a plurality of battery cells, a charging unit configured to charge the battery module using power supplied from an external power source, and an overcharge preventing unit configured to deform according to an internal pressure of the battery module to electrically couple the battery module and the charging unit, wherein the charging unit is configured to stop charging the battery module when the charging unit is electrically coupled to the battery module by the overcharge preventing unit.

Abstract: A rechargeable battery and a rechargeable battery module, the rechargeable battery including an electrode assembly; a case accommodating the electrode assembly; a cap plate closing and sealing an opening of the case; and electrode terminals electrically connected to the electrode assembly and disposed in terminal holes of the cap plate, at least part of the electrode terminals being exposed outside of the cap plate, wherein each of the electrode terminals includes a base portion facing the cap plate; and a coupling portion protruding from at least one part of a top of the base portion, the coupling portion being coupleable to a bus bar by press-fitting.

Abstract: A rechargeable battery 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 first conductive plate between the first electrode assembly and the case; and a first contact electrically coupling the first conductive plate to the second electrode assembly.

Abstract: A rechargeable battery protection apparatus includes: a battery module including a plurality of unit cells coupled in series between a positive terminal and a negative terminal, and configured to be coupled to a charger through a first external port coupled to the positive terminal and a second external port coupled to the negative terminal to charge the plurality of unit cells; a pack fuse on a high current path between the battery module and the charger; and a connector that forms a bypass path that bypasses a current between a first unit cell and a second unit cell among the plurality of unit cells to the pack fuse depending on an internal pressure of the battery module.

Abstract: A secondary battery including a case, at least one electrode assembly housed in the case, and a cap plate coupled to the case includes a terminal protruding through the cap plate, a collector between the cap plate and the electrode assembly electrically coupling the terminal and the electrode assembly, and an insulation member between the collector and the electrode assembly. The insulation member may include a flow passage between the collector and the insulation member configured to allow an electrolyte of the secondary batter to flow through.

Abstract: A secondary battery including an electrode assembly; a case accommodating the electrode assembly; a cap plate sealing the case; a terminal plate on the cap plate; a current collecting terminal penetrating through the cap plate and the terminal plate, the current collecting terminal being coupled with a top surface of the terminal plate and being electrically connected to the electrode assembly; and a reinforcing plate coupled with a bottom surface of the terminal plate to face the terminal plate.

Abstract: A rechargeable battery includes: an electrode assembly including a first electrode having a first polarity and a second electrode having a second polarity, the second polarity being different from the first polarity; a case housing the electrode assembly; a first terminal electrically connected to the first electrode; a cap plate coupled to an opening of the case; a first lower insulating member between the first electrode and the cap plate; and a first short-circuit member between the first terminal and the first lower insulating member, and configured to be deformed to electrically connect the first electrode to the cap plate, wherein the first terminal includes a first fixing portion electrically connected to the first electrode.

Abstract: A secondary battery includes a case; a cap plate coupled to the case; at least one electrode assembly accommodated in the case, the electrode assembly including a positive electrode plate, a negative electrode plate, and a separator located between the positive and negative electrode plates; an electrode collector electrically connected to the electrode assembly; an electrode terminal connected to the electrode collector and protruding outward from the cap plate; a gasket surrounding the electrode terminal; and a reinforcement part coupled to the gasket such that at least a portion of the electrode collector is located between the reinforcement part and the gasket.

Abstract: A battery includes a plurality of electrode assemblies arranged in a case, each electrode assembly including a first electrode, a second electrode and a separator between the first electrode and the second electrode, and an interior safety member including an interior plate between the electrode assemblies, the interior safety member being electrically connected to at least one of the plurality of electrode assemblies.

Abstract: A rechargeable battery includes an electrode assembly that performs charging and discharging; a case in which the electrode assembly is installed; a cap plate coupled to the case; an electrode terminal coupled to a terminal hole of the cap plate; and an insulator between the cap plate and the electrode terminal. The electrode includes a flow path that supplies a cooling fluid to a portion of the electrode terminal coupled with the insulator.

Abstract: A rechargeable battery includes an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode. The rechargeable battery also includes a case accommodating the electrode assembly. The rechargeable battery further includes a cap plate including a first plate and a second plate coupled to the first plate along a joint. The cap plate is coupled to an opening of the case. The rechargeable battery also includes a vent unit at the joint where the first plate of the cap plate is coupled to the second plate.

Abstract: A rechargeable battery module includes a plurality of unit cells including rechargeable batteries and adjacently disposed, at least one bus bar connecting electrode terminals of adjacent unit cells of the plurality of unit cells, and a cover configured to cover the plurality of unit cells, the cover including a coupling part coupled with the at least one bus bar, and a signal detector electrically connected to the bus bar.

Abstract: A system for measuring a length of an electrode plate includes a body on which an electrode plate roll formed by spirally winding the electrode plate is provided; a control device to which the body is combined; and a measuring device including a thickness measurement unit combined with the body and electrically connected to the control device to measure a spirally wound thickness of the electrode plate that is spirally wound on the electrode plate roll, and a diameter measurement unit to measure a diameter of a hollow portion of the electrode plate roll, wherein the control device receives a moving distance of the thickness measurement unit and a moving distance of the diameter measurement unit and calculates the length of the electrode plate of the electrode plate roll.

Abstract: Provided is a secondary battery including: an electrode assembly; a case housing the electrode assembly and having a case opening; a cap plate substantially sealing the case opening; a first terminal plate on the cap plate; a first collector terminal coupling the electrode assembly to the first terminal plate; and a seal gasket between the first collector terminal and the cap plate, wherein the first collector terminal includes: a lower terminal adjacent the electrode assembly, and an upper terminal adjacent the first terminal plate, the upper terminal including a first metal different from a second metal of the lower terminal, and contacting the lower terminal at an interface between the first metal and the second metal, and wherein the seal gasket covers at least a portion of a side surface of the interface between the first metal and the second metal.

Abstract: A protection apparatus for a rechargeable battery includes a battery module, a cathode power line, an anode power line, a signal line, and a battery protector. The battery module includes a unit cell, a conductor case, a cathode, and an anode. The battery protector measures a charged voltage of the unit cell through the cathode power line and the anode power line, measures a detection voltage of the unit cell through the anode power line and the signal line, and determines a charged state of the unit cell based on a calculated voltage ratio of the charged voltage and the detection voltage.

Abstract: A rechargeable battery charging apparatus includes a battery module including a plurality of battery cells, a charging unit configured to charge the battery module using power supplied from the outside, and an overcharge preventing unit configured to deform according to internal pressure of the battery module to electrically couple the battery module and the charging unit, wherein the charging unit is configured to stop the charging of the battery module when the charging unit is electrically coupled to the battery module by the overcharge preventing unit.

Abstract: A rechargeable battery includes an electrode assembly having a first electrode and a second electrode; a case housing the electrode assembly; a cap plate coupled to the case; a short-circuit tab electrically coupled to the second electrode and having an opening; a short-circuit member electrically coupled to the first electrode and configured to be moved by a change in pressure to be electrically coupled to the short-circuit tab; and a cover covering the opening in the short-circuit tab.