Abstract: A power battery heat exchanger, a power battery system and an electric vehicle are provided. The power battery heat exchanger comprises a connector, a first collecting tube assembly and a second collecting tube assembly which are arranged at intervals in a first direction, and a plurality of harmonica tubes arranged between the first collecting tube assembly and the second collecting tube assembly and arranged at intervals in a second direction. Each harmonica tube comprises a first end and a second end that are opposite to each other, an inlet of the connector is respectively in communication with first ends of one or more harmonica tubes through the first collecting tube, and an outlet of the connector is respectively in communication with first ends of remaining harmonica tubes through the collecting tube. Second ends of the plurality of harmonica tubes are in communication through the second collecting tube assembly.

Abstract: A direct cooling plate, a heat exchanger, a power battery pack and a vehicle are disclosed. The direct cooling plate includes a plurality of heat exchange channels, which are arranged inside the direct cooling plate. Each heat exchange channel includes an inlet for a refrigerant and an outlet for the refrigerant to flow out therefrom. The at least one heat exchange channel is circumferentially arranged around the other heat exchange channels; and each heat exchange channel forms a heat exchange unit at the direct cooling plate, and the heat exchange unit is used for performing heat exchange in different temperature regions of a battery. The direct cooling plate can control the temperature of the refrigerant at the inlet of each heat exchange channel aimed at different temperature regions of the battery, such that the overall temperature difference of the battery is improved, and prolonging the service life of the battery.

Abstract: A vehicle is provided with a battery pack comprising a heat radiator assembly. The heat radiator assembly comprises a first heat radiator, a second heat radiator, a third heat radiator, and at least one fourth heat radiator. The third heat radiator is coupled between the first heat radiator and the second heat radiator. The third heat radiator is separately communicated with the first heat radiator and the second heat radiator; the at least one fourth heat radiator is coupled between the first heat radiator and the second heat radiator; the at least one fourth heat radiator and the third heat radiator are arranged side by side between the first heat radiator and the second heat radiator; the first heat radiator and the second heat radiator are both stamping plate-type heat radiators; and the fourth heat radiator is a harmonica tube-type heat radiator.

Abstract: A harmonica-shaped tube, a harmonica-shaped tube type heat exchanger and a vehicle are provided. The harmonica-shaped tube includes a plurality of flow channels arranged at intervals. Inner walls of at least some flow channels include protrusions protruding in a direction approaching centers of the flow channels and/or include recesses recessing in a direction away from the centers of the flow channels. The protrusions and recesses enable a liquid fluid (e.g., refrigerant) to nucleate rapidly, and can also burst large nucleuses which grow in a disorderly manner, thereby preventing the large nucleuses from forming boundary layers on inner walls of the plurality of flow channels, such that nucleuses can be separated from inner wall surfaces rapidly. Therefore, heat exchange performance of the harmonica-shaped tube is improved, and heat exchange requirements of a traction battery are satisfied.