A sampling assembly for a battery module, the battery module comprising a busbar, wherein the sampling assembly comprises: a sampling circuit board with a predetermined length and a predetermined width; a sampling leg comprising a first connection portion, an intermediate portion and a second connection portion, the first connection portion being connected to the sampling circuit board, the second connection portion configured to be connected to the busbar, the first connection portion comprising a first connection region connected to the intermediate portion, the second connection portion comprising a second connection region connected to the intermediate portion, at least a part of the intermediate portion having a cross-sectional area which is smaller than a cross-sectional area of the first connection region and smaller than a cross-sectional area of the second connection region; wherein the first connection portion, the intermediate portion, and the second connection portion are successively distributed in a width direction of the sampling circuit board; wherein a length direction of the sampling circuit board intersects with the width direction of the sampling circuit board; wherein the intermediate portion is provided with a through hole, a cross-sectional area of a portion of the intermediate portion corresponding to the through hole being smaller than the cross-sectional area of the first connection region and smaller than the cross-sectional area of the second connection region; wherein the intermediate portion comprises a bent pointed region protruding in the length direction of the sampling circuit board, a starting point and/or an end point of the through hole being offset from the bent pointed region in the width direction of the sampling circuit board; wherein the starting point of the through hole is close to the first connection region and has a predetermined distance from the first connection region, and the end point is close to the second connection region and has a predetermined distance from the second connection region. a sampling circuit board with a predetermined length and a predetermined width; a sampling leg comprising a first connection portion, an intermediate portion and a second connection portion, the first connection portion being connected to the sampling circuit board, the second connection portion configured to be connected to the busbar, the first connection portion comprising a first connection region connected to the intermediate portion, the second connection portion comprising a second connection region connected to the intermediate portion, at least a part of the intermediate portion having a cross-sectional area which is smaller than a cross-sectional area of the first connection region and smaller than a cross-sectional area of the second connection region; wherein the first connection portion, the intermediate portion, and the second connection portion are successively distributed in a width direction of the sampling circuit board; wherein a length direction of the sampling circuit board intersects with the width direction of the sampling circuit board; wherein the intermediate portion is provided with a through hole, a cross-sectional area of a portion of the intermediate portion corresponding to the through hole being smaller than the cross-sectional area of the first connection region and smaller than the cross-sectional area of the second connection region; wherein the intermediate portion comprises a bent pointed region protruding in the length direction of the sampling circuit board, a starting point and/or an end point of the through hole being offset from the bent pointed region in the width direction of the sampling circuit board; wherein the starting point of the through hole is close to the first connection region and has a predetermined distance from the first connection region, and the end point is close to the second connection region and has a predetermined distance from the second connection region.