Battery module
View Patent ↗A battery module includes a plurality of cylindrical batteries and lead plate connected to cylindrical batteries and electrically connecting the plurality of cylindrical batteries. Cylindrical battery includes can bottom valve including a thin-walled line ruptured and opening an exhaust port when an internal pressure of an outer covering can becomes higher than a threshold pressure. Lead plate includes double-supported arm arranged opposing a can bottom of cylindrical battery and coupled to lead plate at both ends at a position opposing can bottom valve, and gas permeation gap of exhaust gas ejected from the exhaust port on both sides of double-supported arm.
1 . A battery module comprising:
a plurality of cylindrical batteries; and
a lead plate connected to the plurality of cylindrical batteries and electrically connecting the plurality of cylindrical batteries to each other,
wherein
each of the plurality of cylindrical batteries includes a can bottom valve including a thin-walled line that is ruptured and opens an exhaust port when an internal pressure of an outer covering can becomes higher than a threshold pressure, and
the lead plate includes
a double-supported arm arranged opposing the can bottom valve at a can bottom of a corresponding one of the plurality of cylindrical batteries, wherein the double-supported arm is free of direct contact with the can bottom and coupled to a rest of the lead plate at both ends of the double-supported arm, and
a gas permeation gap for exhaust gas ejected from the exhaust port disposed on both sides of the double-supported arm.
2 . The battery module according to claim 1 , wherein the double-supported arm is arranged elongated in a diametrical direction of the can bottom of a circular shape.
3 . The battery module according to claim 1 , wherein
the lead plate includes connection arms provided by welding to the can bottom on both sides of the double-supported arm,
the gas permeation gap is provided between the double-supported arm and each of the connection arms, and
each of the connection arms is a cantilever arm with one end coupled to the lead plate, and includes a tip welded to the can bottom.
4 . The battery module according to claim 3 , wherein each of the connection arms is welded to the can bottom outside a thin-walled line that is annular.
5 . The battery module according to claim 1 , wherein each of the cylindrical batteries includes a can bottom valve on the can bottom of the outer covering can and a exhaust valve on a sealing plate formed by closing an opening of the outer covering can.
6 . The battery module according to claim 1 , wherein a lateral width of the double-supported arm is greater than or equal to 1.5 mm.
7 . The battery module according to claim 1 , wherein an opening width (K) of the gas permeation gap in plan view is less than or equal to 5 mm.
8 . The battery module according to claim 1 , wherein each of the cylindrical batteries is a non-aqueous electrolyte secondary battery.
9 . A battery module comprising:
a plurality of cylindrical batteries; and
a lead plate connected to the plurality of cylindrical batteries and electrically connecting the plurality of cylindrical batteries to each other,
wherein
each of the plurality of cylindrical batteries includes a can bottom valve including a thin-walled line that is ruptured and opens an exhaust port when an internal pressure of an outer covering can becomes higher than a threshold pressure,
the lead plate includes
a double-supported arm arranged opposing a can bottom of a corresponding one of the plurality of cylindrical batteries and coupled to the lead plate at both ends at a position opposing the can bottom valve, and
a gas permeation gap for exhaust gas ejected from the exhaust port disposed on both sides of the double-supported arm,
the lead plate includes connection arms provided by welding to the can bottom on both sides of the double-supported arm,
the gas permeation gap is provided between the double-supported arm and each of the connection arms, and
each of the connection arms is a cantilever arm with one end coupled to the lead plate, and includes a tip welded to the can bottom.
10 . The battery module according to claim 9 , wherein the double-supported arm is arranged elongated in a diametrical direction of the can bottom of a circular shape.
11 . The battery module according to claim 9 , wherein each of the connection arms is welded to the can bottom outside a thin-walled line that is annular.
12 . The battery module according to claim 9 , wherein each of the cylindrical batteries includes a can bottom valve on the can bottom of the outer covering can and a exhaust valve on a sealing plate formed by closing an opening of the outer covering can.
13 . The battery module according to claim 9 , wherein a lateral width of the double-supported arm is greater than or equal to 1.5 mm.
14 . The battery module according to claim 9 , wherein an opening width (K) of the gas permeation gap in plan view is less than or equal to 5 mm.
15 . The battery module according to claim 9 , wherein each of the cylindrical batteries is a non-aqueous electrolyte secondary battery.