Secondary battery pack having excellent energy density and pcm assembly therefor

Abstract

Disclosed herein is a secondary battery pack including a battery cell, and a protection circuit module (PCM) assembly, configured in a specific structure, coupled to the top of the battery cell. The secondary battery pack includes a battery cell having an electrode assembly mounted in a battery case together with an electrolyte in a sealed state, a protection circuit module (PCM) assembly including a PCM and connection members, the PCM assembly being provided with a through-hole for connection, an insulative mounting member mounted at the top of the battery cell, an insulative cap coupled to an upper end of the battery cell. One of the connection members, i.e., the connection member (A), protrudes from one end of the PCM assembly such that a region of the connection member (A) electrically connected to the battery cell is exposed upward from the PCM assembly. The other connection member, i.e., the connection member (B), is coupled to the bottom of the PCM such that at least a portion of the connection member (B) is exposed upward from the PCM assembly through the through-hole for connection. The electrical connection between the connection members and the electrode terminals of the battery cell is achieved at the top of the PCM while the insulative mounting member and the PCM assembly are loaded on the battery cell.