BATTERY, BATTERY CAN, BATTERY PACK, ELECTRONIC INSTRUMENT, ELECTRIC CAR, POWER STORAGE DEVICE AND POWER SYSTEM

摘要

This battery comprises an electrode body, and a battery can having a bottom portion and housing the electrode body. At least one of the surfaces of the bottom portion has two or more grooves on the same circle. The proportion of the inner diameter of the groove with respect to the outer diameter of the bottom portion is 44% or greater. The proportion of the total groove spacing with respect to the circumference of the circle is between 2% and 24% inclusive.