A power storage device includes a case, a power storage element disposed in the case, a lead connected to an electrode of the power storage element, a sealing member sealing an opening of the case. The sealing member includes a gasket and a sealing plate having conductivity. The gasket includes a base having a disk shape. The base is disposed between the sealing plate and the power storage element. The base has a through-hole formed therein. The sealing plate includes a protrusion inserted in the through-hole. The protrusion of the sealing plate is connected to the lead. The protrusion is configured to be displaced in a direction away from the lead in accordance with an increase of an internal pressure of the case so as to be disconnected from the lead.

A cylindrical secondary battery configured to have a structure to which an adhesion unit, including an adhesive material, a conductive material, and a gas-generating material, is provided. The adhesion unit is configured to couple a cap assembly, which functions as a positive electrode terminal of the cylindrical secondary battery, and a positive electrode tab of a jelly-roll type electrode assembly to each other.

A battery pack includes: a plurality of battery modules; a venting inducing frame disposed along an edge of the battery modules and forming a venting passage; a venting gate for connecting an inside of the battery modules and the venting inducing frame; a rupture portion formed on an outside of the venting inducing frame; and a unidirectional valve formed on a passage of the venting inducing frame, wherein the unidirectional valve intercepts a passage in a direction connected to a venting gate connected to a second battery module from the venting gate connected to one battery module from among the battery modules, and opens a passage in a direction connected to the rupture portion from the venting gate connected to one battery module from among the battery modules.

An apparatus for measuring a pressure of battery cells includes: a battery cell; a pressure sensor configured to measure the surface pressure of the battery cell; and a first plate arranged between the battery cell and the pressure sensor so as to be in contact with the battery cell and the pressure sensor.

A degradation-determination system includes a volume change detecting unit configured to detect a volume change of a lithium-ion battery, a capacity change detecting unit configured to detect a capacity change of the lithium-ion battery, and a charge control unit configured to control charge of the lithium-ion battery. The charge control unit is configured to determine that the lithium-ion battery is in a state of degradation, upon occurrence of a condition in which volume expansion of the lithium-ion battery is detected by the volume change detecting unit, in conjunction with a condition in which a decrease in a capacity of the lithium-ion battery is not detected by the capacity change detecting unit.

An assembly for supplying power to an aircraft is disclosed having at least one battery housed in a respective housing, each housing comprising a wall in which a through-opening is arranged, and an exhaust device including a discharge duct connecting each housing opening to a common discharge port, a valve mounted on each opening. Each valve includes a membrane arranged so as to seal the opening closed and having a surface of pressure application towards the inside of the housing and a surface of pressure application towards the outside of the housing. The surface of pressure application towards the outside of the housing is larger than the surface of pressure application towards the inside of the housing, so that the membrane bursts at a bursting pressure inside the housing that is lower than a bursting pressure reached outside the housing.

The present invention relates to a system and a method of detecting swelling of a battery cell, which, when abnormal swelling is generated in a battery cell embedded in a battery pack, rapidly detect the abnormal swelling and control a supply of a power source to the battery pack to be blocked, thereby preventing a structural deformation of the battery cell and the battery pack and life shortening of the battery, and preventing an accident, such as ignition and explosion.

A battery module according to an embodiment of the present invention includes: a battery stack in which a plurality of battery cells including a cathode tab and an anode tab are stacked; a first bus bar assembly including a first bus bar connecting cathode tabs and anode tabs located at one end of the battery stack; and a second bus bar assembly including a second bus bar connecting cathode tabs and anode tabs located at the other end of the battery stack. The first bus bar assembly or the second bus bar assembly may include a venting part including at least one venting knife which protrudes from the first bus bar or the second bus bar toward the battery cell, such that stability of the battery module may be improved.

A circuit connection apparatus includes a first member and a second member sequentially stacked along a first direction. The first member is conductive. The first member includes a first section, a second section, and a third section. The first section and the second section are spaced apart in the first member. The third section is connected to the first section and the second section separately. The second member includes a boss extending toward the first member. Viewed along the first direction, the boss at least partly overlaps the third section. Along the first direction, the boss and the third section are interspaced with a clearance. The first member and the second member are able to approach each other. The boss is configured to be able to press against and be pressed by the third section to fracture the third section.

A battery pack includes a first battery case accommodating a plurality of cells, and a second battery case laminated above the first battery case and accommodating a plurality of cells. The first battery case has a first through-hole on an upper surface. The second battery case has a second through-hole on a bottom surface which communicates with the first through-hole. The battery pack includes a communication port composed of the first through-hole and the second through-hole, a gas discharge valve which is provided only in either the first battery case or the second battery case and opens when internal pressure of the battery pack is higher than a predetermined value, and a temperature sensor provided on a gas flow path connected to the gas discharge valve.