CYLINDRICAL BATTERY

摘要

In a cylindrical battery including a gap formed between a peripheral side surface 32b of a dish-shaped portion in an anode terminal plate 32 and a curved end portion 11a of a cathode can 11, and a washer 50 having a washer boss portion 52a and an annular flange portion 50c provided around an upper end surface of the washer boss portion 52a, the washer being mounted to an opening portion of a cathode can 11 such that the washer boss portion 52a is fitted into the gap 201, a vent structure configured to release gas released to the gap 201 from a first vent hole 32a in the anode terminal plate 32 is provided in a range surrounded by a ridge line connecting a highest part 11b of the curved end portion 11a in the washer 50 and the peripheral side surface 32b of the anode terminal plate 32.

主权项

1. A cylindrical battery, comprising:
a bottomed cylindrical battery can in which power generation elements are placed; a terminal plate having an appearance of a substantially dish shape, the terminal plate having an end portion formed on its periphery; a sealing gasket having an end portion formed on its periphery; and a washer, the sealing gasket being provided below the terminal plate when an opening of the battery can is placed upward, the terminal plate and the sealing gasket being provided to the opening of the battery can, with the end portions of the terminal plate and the sealing gasket being subjected to a swaging process together with an end portion of the battery can, the terminal plate including a peripheral side surface of a dish-shaped portion thereof, the battery can including the end portion curved, by the swaging process, to a direction of a cylindrical axis of the battery can, the peripheral side surface and the end portion of the battery can forming a gap therebetween, the washer including a cylindrical boss portion and an annular flange portion provided to a periphery of an upper end surface of the boss portion, the washer being mounted to an opening portion of the battery can with the boss portion being fitted into the gap, the terminal plate including the peripheral side surface having a portion facing the gap, the portion facing the gap having formed therein a first vent hole to release gas in a space between the terminal plate and the sealing gasket, the battery can including the end portion having an edge portion curved slightly downward by the swaging process, the washer including a vent structure provided in a range surrounded by a circular ridge line and the peripheral side surface of the terminal plate, in a state where the washer is mounted to the opening portion of the battery can, the circular ridge line connecting a highest part of the curved end portion of the battery can, the vent structure being configured to release gas flowing from the first vent hole to the gap, to an exterior of the cylindrical battery.