Battery pack having improved strength

摘要

Disclosed herein is a battery pack including a battery cell array including two or more battery cells, each of which has an electrode assembly of a cathode/separator/anode structure disposed in a battery case together with an electrolyte in a sealed state, arranged in a lateral direction, a protection circuit module (PCM) connected to an upper end of the battery cell array to control an operation of the battery pack, a pack case in which the battery cell array and the protection circuit module are disposed, and a plate-shaped reinforcing member mounted between the pack case and the battery cell array to increase mechanical strength of the pack case.

主权项

1. A battery pack comprising:
(a) a battery cell array comprising two or more battery cells, each of which has an electrode assembly of a cathode/separator/anode structure disposed in a battery case together with an electrolyte in a sealed state, arranged in a lateral direction in a same surface plane; (b) a protection circuit module (PCM) connected to an upper end of the battery cell array to control an operation of the battery pack; (c) a pack case in which the battery cell array and the protection circuit module are disposed, wherein the pack case comprises a lower case at which the battery cell array and the protection circuit module are disposed and an upper case to cover the lower case so as to fix the battery cell array and the protection circuit module in place, wherein the lower case is partitioned into a battery cell mounting part, at which the battery cells are disposed, and a protection circuit module mounting part, at which the protection circuit module is disposed, and a partition wall is formed at an interface between the battery cell mounting part and the protection circuit module mounting part, openings, through which electrode terminals of the battery cells are exposed toward the protection circuit module, being formed at portions of the partition wall corresponding to electrical connection regions between the electrode terminals of the battery cells and the protection circuit module, wherein the protection circuit module mounting part comprises support parts to support the electrical connection regions between the electrode terminals of the battery cells and the protection circuit module; and (d) a plate-shaped reinforcing member mounted between the pack case and the battery cell array to increase mechanical strength of the pack case.