The present application provides a battery box, including a lower box body. The lower box body includes: a first plate including a bottom wall and a peripheral wall that is connected to the peripheral edge of the bottom wall and extending upwards, where the bottom wall and the peripheral wall together form an accommodating space that opens upwards along a height direction; and a second plate that is fastened under the bottom wall and that forms, together with the bottom wall, an inlet flow path, an outlet flow path, and a main flow path communicating with both the inlet flow path and the outlet flow path, where the main flow path includes a first main flow path, a second main flow path, and a plurality of parallel branch flow paths that communicate with both the first main flow path and the second main flow path.
1. A battery box, comprising a lower box body, wherein the lower box body comprises:
a first plate comprising a bottom wall and a peripheral wall that is connected to the peripheral edge of the bottom wall and extending upwards, wherein the bottom wall and the peripheral wall together form an accommodating space that opens upwards along a height direction; and
a second plate that is fastened under the bottom wall and that is connected together with the bottom wall, the second plate comprises a plate body, wherein the plate body comprises:
a first concave portion that is recessed downward from a side of the second plate facing toward the first plate;
a peripheral portion that is connected to an end portion of the first concave portion and extending outward around the first concave portion; and
a plurality of intermediate convex portions spaced apart along a longitudinal direction, wherein each intermediate convex portion is recessed upward from a side of the first concave portion facing away from the bottom wall and protrudes toward the bottom wall, and each intermediate convex portion is spaced apart from the periphery of the first concave portion along a traverse direction;
wherein the peripheral portion of the plate body and the plurality of intermediate convex portions are each in sealed connection to the bottom wall of the first plate, and the first concave portion is spaced apart from the bottom wall to form flow paths;
the second plate further comprises a first lug and a second lug that are connected to one side of the plate body along the longitudinal direction and spaced apart along the traverse direction, wherein
the first lug is provided with a first lug edge portion connected to the peripheral portion of the plate body, and a second concave portion that is recessed downward from the first lug edge portion and communicating with the first concave portion;
the second lug is provided with a second lug edge portion connected to the peripheral portion of the plate body, and a third concave portion that is recessed downward from the second lug edge portion and communicating with the first concave portion; and
the first lug edge portion of the first lug and the second lug edge portion of the second lug are each in sealed connection to the bottom wall, the second concave portion of the first lug is spaced apart from the bottom wall to form the inlet flow path communicating with the first main flow path, and the third concave portion of the second lug is spaced apart from the bottom wall to form the outlet flow path communicating with the second main flow path.
2. The battery box according to claim 1 , wherein the plate body further comprises:
a separation convex portion that is recessed upward from the side of the first concave portion facing away from the bottom wall and that protrudes toward the bottom wall, wherein the separation convex portion is connected to an intermediate convex portion adjacent to the first lug and the second lug, and extends to the peripheral portion between the first lug and the second lug, and the separation convex portion is in sealed connection to the bottom wall of the first plate to block a branch flow path adjacent to the inlet flow path and the outlet flow path at a position of the separation convex portion.
3. The battery box according to claim 2 , characterized in that wherein
the bottom wall of the first plate is further provided with a fourth concave portion that is recessed upward from a side of the bottom wall facing toward the second plate and that protrudes beyond the opposite side, a contour of the fourth concave portion matches an outer contour of the second plate, and the second plate is embedded into the fourth concave portion of the bottom wall.
4. The battery box according to claim 3 , wherein
the peripheral portion of the plate body of the second plate, the plurality of intermediate convex portions, the separation convex portion, the first lug edge portion of the first lug, and the second lug edge portion of the second lug are each in sealed connection to an inner top surface of the fourth concave portion of the bottom wall, wherein the first concave portion and the fourth concave portion form the first main flow path, the plurality of parallel branch flow paths, and the second main flow path; the second concave portion of the first lug and the fourth concave portion form the inlet flow path communicating with the first main flow path; and the third concave portion of the second lug and the fourth concave portion form the outlet flow path communicating with the second main flow path.
5. The battery box according to claim 3 , wherein
the peripheral portion of the plate body of the second plate, the plurality of intermediate convex portions, the separation convex portion, the first lug edge portion of the first lug, and the second lug edge portion of the second lug are each in sealed connection to the fourth concave portion by adhesive.
6. The battery box according to claim 3 , wherein the periphery of the second plate is in welded connection to the periphery of the fourth concave portion.
7. The battery box according to claim 1 , wherein the second plate is formed by integral stamping.
8. The battery box according to claim 1 , wherein the battery box further comprises a battery group accommodated in the accommodating space of the first plate, wherein a lower surface of the battery group is in thermally conductive contact with the bottom wall of the first plate.
9. The battery box according to claim 1 , wherein the second plate forms, together with the bottom wall, an inlet flow path, an outlet flow path, and a main flow path communicating with both the inlet flow path and the outlet flow path, wherein the main flow path comprises a first main flow path, a second main flow path, and a plurality of parallel branch flow paths that communicate with both the first main flow path and the second main flow path.