Patent ID: 9548477
Date: 2017-01-17
CPC Classifications: H01M,Y02E

Claim:
1. A battery block comprising: a battery case made of metal and having a plurality of holes; and a plurality of unit cells accommodated in the respective holes, wherein a minimum thickness section of the battery case between any two of the holes neighboring each other satisfies the following relationship: where K1 is a thermal conductance between any one of the unit cells and the battery case, K2 is a thermal conductance of the minimum thickness section, K3 is a ratio of an abnormal heat temperature of a reference cell under room temperature to ambient temperature causing abnormal heat generation in the reference cell under room temperature, the abnormal heat temperature is defined as a temperature caused by a short circuit within the unit cell, the battery case comprises a plurality of circular cylinders joined to each other, the cylinders each having the holes, and the cylinders each include a cylindrical core made of metal, and a metallic material covering an outer surface of the core and having a lower melting point than that of a material of the core.