| CPC H01M 50/211 (2021.01) [H01M 50/264 (2021.01); H01M 50/502 (2021.01)] | 8 Claims |

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1. A battery pack comprising:
a battery cell stack including a plurality of stacked battery cells, the battery cell stack including a lower surface and an upper surface on an opposite side and side surfaces extending therebetween, and
a busbar frame arranged to cover at least one surface of the battery cell stack,
wherein the battery cell stack comprises a lower frame to cover the lower surface and the side surfaces, and an entirely flat upper plate for covering the upper surface, and
wherein at least one assembly guide part is formed at an edge of the lower frame, the at least one assembly guide part including a support part that protrudes from the lower frame, the support part being configured to be received in a groove part of the upper plate to couple the lower frame to the upper plate, the groove part being defined by an opening extending through the upper plate.
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