Patent ID: 9123951
Filing Date: 2015-09-01
Classification: H01M,Y02E,Y02P

Abstract:
1. A secondary battery pack comprising: a battery cell having an electrode assembly of a cathode/separator/anode structure mounted in a battery case together with an electrolyte in a sealed state; a protection circuit module (PCM) assembly having a size less than the top of the battery cell in the longitudinal direction of the battery cell and including a PCM and first and second connection members coupled to a bottom of the PCM, the PCM assembly being provided with a through-hole for connection; an insulative mounting member constructed in a structure in which the PCM assembly is loaded on the top of the insulative mounting member, the insulative mounting member being mounted at the top of the battery cell, the insulative mounting member having openings through which first and second electrode terminals of the battery cells are exposed; and an insulative cap coupled to an upper end of the battery cell for covering the insulative mounting member in a state in which the PCM assembly is loaded on the insulative mounting member, wherein the first connection member is electrically connected to the first electrode terminal of the battery cell and protrudes from one end of the PCM assembly such that a region of the first connection member electrically connected to the first electrode terminal of the battery cell is exposed upward from the PCM assembly, the first connection member includes a PCM coupling part coupled to the bottom of the PCM, a battery cell coupling part coupled to the top of the battery cell, and a positive temperature coefficient (PTC) element disposed between the PCM coupling part and the battery cell coupling part, the second connection member is electrically connected to the second electrode terminal of the battery cell and is coupled to the bottom of the PCM such that at least a portion of the second connection member is exposed upward from the PCM assembly through the through-hole for connection, the insulative mounting member has a size less than the top of the battery cell in the longitudinal direction of the battery cell such that the insulative mounting member is provided with a region where the first connection member is connected to the battery cell, one end of the PCM assembly in which the first connection member is connected protrudes from one end of the insulative mounting member in the longitudinal direction such that the battery cell coupling part and the PTC element of the first connection member are disposed at the region where the first connection member is connected to the battery cell, the electrical connection between the first and second connection members and the electrode terminals of the battery cell is achieved at a top of the PCM while the insulative mounting member and the PCM assembly are loaded on the battery cell, and the insulative cap extends downward by a predetermined length such that at least a portion of the insulative cap covers the outside surface of the upper end of the battery cell in a state in which the insulative cap is coupled to the upper end of the battery cell.