A battery pack, comprising: a housing comprising a housing bottom wall and a housing side wall, wherein the housing bottom wall and the housing side wall form an accommodating space; a battery module disposed in the accommodating space and comprising a plurality of batteries, wherein a case side wall of the battery comprises two first side walls oppositely disposed along a first direction and two second side walls oppositely disposed along a second direction, an area of the first side wall is larger than an area of the second side wall, and the first direction and the second direction are both parallel to the housing bottom wall and perpendicular to each other; and a frame structure disposed in the accommodating space for limiting a position of the battery module, wherein the frame structure comprises a first beam and a second beam respectively located at two ends of the battery module along the first direction, the first beam and the second beam extend along the second direction and are disposed opposite to the first side wall along the first direction, the first beam is non-detachably connected to the housing by welding, riveting, bonding, or a combination of riveting and bonding, and the second beam is detachably connected to the housing by threaded connection, key connection, pin connection; wherein the battery pack comprises a fifth beam disposed in the accommodating space, the fifth beam extends in the second direction and is located at an end of the battery module where the second beam is disposed, the second beam is located between the fifth beam and the battery module and has a spacing from the fifth beam in the first direction, and the fifth beam is fixedly connected to the housing bottom wall. a housing comprising a housing bottom wall and a housing side wall, wherein the housing bottom wall and the housing side wall form an accommodating space; a battery module disposed in the accommodating space and comprising a plurality of batteries, wherein a case side wall of the battery comprises two first side walls oppositely disposed along a first direction and two second side walls oppositely disposed along a second direction, an area of the first side wall is larger than an area of the second side wall, and the first direction and the second direction are both parallel to the housing bottom wall and perpendicular to each other; and a frame structure disposed in the accommodating space for limiting a position of the battery module, wherein the frame structure comprises a first beam and a second beam respectively located at two ends of the battery module along the first direction, the first beam and the second beam extend along the second direction and are disposed opposite to the first side wall along the first direction, the first beam is non-detachably connected to the housing by welding, riveting, bonding, or a combination of riveting and bonding, and the second beam is detachably connected to the housing by threaded connection, key connection, pin connection; wherein the battery pack comprises a fifth beam disposed in the accommodating space, the fifth beam extends in the second direction and is located at an end of the battery module where the second beam is disposed, the second beam is located between the fifth beam and the battery module and has a spacing from the fifth beam in the first direction, and the fifth beam is fixedly connected to the housing bottom wall.