Patent ID: 9356294
Filing Date: 2016-05-31
CPC Classification: H01M,Y02E,Y02P,Y10T

Claim Text:
1. A secondary battery, comprising: an electrode assembly; and a case accommodating the electrode assembly, wherein the electrode assembly comprises: a first electrode plate comprising a first collector and a first active material layer formed on at least one side of the first collector; a second electrode plate comprising a second collector and a second active material layer formed on at least one side of the second collector; and a separator interposed between the first and second electrode plates, wherein a plurality of pores are formed only in part of the first and second collectors, wherein the pores comprise a plurality of spatially distinct groups of pores formed in one of the first and second collectors, wherein no pores are formed between adjacent groups of pores, wherein distances taken along a length of the one of the first and second collectors between the adjacent groups of pores are greater than distances between the pores within each of the groups, wherein each and every spatially distinct group of pores is fully surrounded by a region of the one of the first and second collectors where no pores are formed, and wherein at least one of the groups of pores includes a plurality of pores arranged in a matrix having a plurality of rows and columns.