A power battery top cap structure, comprising: a top cap piece, a length, a width, and a thickness of the top cap piece extending on an X axis, a Y axis, and a Z axis, respectively, where the X axis, the Y axis, and the Z axis are perpendicular to each other; a first electrode assembly and a second electrode assembly fixed on the top cap piece, wherein the first electrode assembly comprises a first electrode column and a first electrode column seal ring, and the second electrode assembly comprises a second electrode column and a second electrode column seal ring; a lower insulation member fixed below the top cap piece by a snap fit, a length, a width, and a thickness of the lower insulation member extending on the X axis, the Y axis, and the Z axis, respectively, wherein the lower insulation member comprises, along the X axis, a snapping portion arranged on each of two ends thereof, and a connecting portion arranged between the two snapping portions; an abutment member extending along the Y axis and abutting between the connecting portion and the top cap piece, a minimum distance between the connecting portion and the top cap piece along the Z axis being G3, where G3 > 0; and a first switching piece, a second switching piece, and an insulation end plate, both the first switching piece and the second switching piece are beneath the lower insulation member, wherein each of the snapping portions comprises an avoidance hole, wherein the insulation end plate is fixed below the lower insulation member, both the first switching piece and the second switching piece are arranged between the insulation end plate and the lower insulation member, and wherein the first electrode column is connected with the first switching piece through the lower insulation member via one avoidance hole, and the second electrode column is connected with the second switching piece through the lower insulation member via another avoidance hole. a top cap piece, a length, a width, and a thickness of the top cap piece extending on an X axis, a Y axis, and a Z axis, respectively, where the X axis, the Y axis, and the Z axis are perpendicular to each other; a first electrode assembly and a second electrode assembly fixed on the top cap piece, wherein the first electrode assembly comprises a first electrode column and a first electrode column seal ring, and the second electrode assembly comprises a second electrode column and a second electrode column seal ring; a lower insulation member fixed below the top cap piece by a snap fit, a length, a width, and a thickness of the lower insulation member extending on the X axis, the Y axis, and the Z axis, respectively, wherein the lower insulation member comprises, along the X axis, a snapping portion arranged on each of two ends thereof, and a connecting portion arranged between the two snapping portions; an abutment member extending along the Y axis and abutting between the connecting portion and the top cap piece, a minimum distance between the connecting portion and the top cap piece along the Z axis being G3, where G3 > 0; and a first switching piece, a second switching piece, and an insulation end plate, both the first switching piece and the second switching piece are beneath the lower insulation member, wherein each of the snapping portions comprises an avoidance hole, wherein the insulation end plate is fixed below the lower insulation member, both the first switching piece and the second switching piece are arranged between the insulation end plate and the lower insulation member, and wherein the first electrode column is connected with the first switching piece through the lower insulation member via one avoidance hole, and the second electrode column is connected with the second switching piece through the lower insulation member via another avoidance hole.