Battery casing and battery assembly

A battery casing (1) and a battery assembly (100) are disclosed. The battery casing has (1) a casing body (20), a least one first stress-bearing element (30), and at least one second stress-bearing element (40). The casing body (20) has two corresponding disposed first walls (21) and a bearing surface (22). The at least one first stress-bearing element (30) is disposed on the bearing surface (22). The two ends of the at least one second stress-bearing element (40) connect with the two first walls (21) and are situated above and aligned with the at least one first stress-bearing element (30) to form at least one stress-bearing space (S1) for accommodating at least one battery (10).