Patent ID: 9722238
Date: 2017-08-01
CPC Classifications: H01M,Y02E

Claim:
1. A battery pack, comprising: a plurality of battery cells that are electrically coupled to one another; and a case covering the plurality of battery cells and including an upper case and a lower case, wherein at least one drainage hole is formed on a bottom of the lower case, wherein the drainage hole includes a first region and a second region, the first region being a region from an inner surface to a predetermined depth in a thickness direction of the bottom of the lower case and the second region being a region from where the first region ends to an outer surface from the thickness direction of the bottom of the lower case, wherein the first region includes a first tilting portion formed tilted such that the drainage hole becomes increasingly smaller, and wherein grooves are formed at regular intervals along a circumference of the drainage hole from where the first tilting portion ends to the outer surface of the bottom of the lower case and a foreign substance blocking portion formed on a same plane as the outer surface of the bottom of the lower case.