Abstract: In one embodiment, a method includes accessing a plurality of images of a region of interest of a person's skin and extracting, from the plurality of images, a color signal of the region of interest as a function of time. The method further includes determining, based at least on the color signal, a first quality associated with an estimated vital sign of the person, where the vital sign estimate is determined from the plurality of images.

Abstract: A power module is provided. The power module includes a housing, a connector, an inductor, a cold plate, and an air-liquid heat exchanger. The connector, the air-liquid heat exchanger, the cold plate, and the inductor are sequentially arranged inside the housing along a first direction. The housing includes a front plate and a rear plate. The front plate and the rear plate are oppositely arranged along the first direction. The connector is arranged between the air-liquid heat exchanger and the front plate along the first direction. The power module has a small size, and has good heat dissipation effect for various heat-generating components, and can reduce heat dissipation costs.

Abstract: A power conversion device and an energy storage cabinet, related to the field of power conversion technologies. The power conversion device includes a housing, a power plate, and a liquid cooling plate. The power plate is located inside the housing. One side of the power plate includes a plurality of power conversion modules, and the other side of the power plate is attached to the liquid cooling plate. The inside of the liquid cooling plate includes a first main channel, at least two branch channels, and a second main channel. Two ends of each branch channel respectively communicate with the first main channel and the second main channel. In a direction perpendicular to the liquid cooling plate, projections of at least two of the plurality of power conversion modules at least partially overlap projections of the different branch channels.

Abstract: A heat dissipation apparatus is provided. The heat dissipation apparatus includes an immersion tank. The immersion tank accommodates a liquid medium. When being used, the board is immersed in the liquid medium, and the liquid medium dissipates heat for the board by absorbing heat. The heat dissipation apparatus further includes a condenser immersed in the liquid medium. The condenser is disposed to dissipate heat for the liquid medium. Heat of the board is transferred to the condenser in the immersion tank by using the liquid medium in the immersion tank as a medium. Then the condenser takes away and dissipates the heat by using a cooling apparatus that is connected to the condenser and that is configured to perform heat exchange for the condenser.

Abstract: This application discloses a liquid cooling heat dissipation apparatus, a motor control unit, a powertrain, and an electric vehicle. The liquid cooling heat dissipation apparatus includes a cover plate, a middle partition plate, a separator wall, and a bottom plate. The cover plate, the middle partition plate, and the bottom plate are sequentially stacked in a first direction. A gap between the cover plate and the middle partition plate forms a first cavity, and a gap between the bottom plate and the middle partition plate forms a second cavity. The separator wall is configured to separate the first cavity into a liquid inlet channel and a liquid outlet channel. The cover plate includes two openings. One opening communicates with the liquid inlet channel, and the other opening communicates with the liquid outlet channel. The middle partition plate includes at least one group of through holes.

Abstract: A power conversion apparatus includes a heat sink and a power module. The heat sink includes a plurality of condensation teeth and an evaporator. The plurality of condensation teeth are spaced apart from each other in a thickness direction of the condensation tooth, and an airflow channel parallel to a second direction is provided between two adjacent condensation teeth. Each condensation tooth has a condensation channel and a solid region that extend in a first direction, and the condensation channel is located on a side of the solid region. The first direction, the second direction, and the thickness direction are perpendicular to each other. In the power conversion apparatus provided, the solid region has a good thermal conductivity, and heat of the evaporator can be effectively transferred to the condensation tooth through the solid region.

Abstract: A heat dissipation system and a power device. The heat dissipation system may include a power module and a condenser. The power module may include a base and a power component, the base has a first chamber, and the first chamber is filled with a refrigerant. The power component is disposed on a first surface of the base, and the power component is in thermally conductive contact with the first surface. Heat generated by the power component may be transferred from the first surface to the first chamber, and is further conducted to the refrigerant, and the refrigerant may be heated and vaporized into vapor. In addition, the condenser communicates with the first chamber, and the vaporized refrigerant may enter the condenser. The refrigerant condensed into a liquid state by the condenser may flow back to the first chamber.

Abstract: A heat dissipation system may include a power module, an evaporator, and a condenser. The power module includes a thermally conductive substrate and a power component, and the power component is fastened to a first surface of the thermally conductive substrate. The evaporator has an evaporation chamber, and the evaporation chamber is filled with a refrigerant. At least one sidewall of the evaporator is provided with a window, the thermally conductive substrate is embedded into the window, at least a part of surfaces of the thermally conductive substrate is immersed in the refrigerant, and the first surface is located on an outer side of the evaporation chamber. The condenser communicates with the evaporation chamber, and the vaporized refrigerant may enter the condenser. The refrigerant condensed into a liquid state by the condenser may flow back to the evaporation chamber.

Abstract: A power module includes a first substrate, a second substrate, a first heat sink, a second heat sink, and a chip that are disposed opposite to each other. The chip is disposed between the first heat sink and the second heat sink that are disposed opposite to each other. The first heat sink and the second heat sink are connected to the chip through sintering or welding. The first substrate and the second substrate are respectively connected to the first heat sink and the second heat sink through welding or sintering.

Abstract: A powertrain, a coolant flow rate estimation method, and an electric vehicle are provided. Coolant in a first cooling loop of the powertrain is configured to cool an inverter. An electronic pump drives the coolant to circulate in the first cooling loop. When a phase current of a motor is greater than or equal to a preset current value, a controller determines a rotation speed of the electronic pump at a first moment as a first rotation speed, and determines a coolant flow rate at the first moment based on a temperature at a first position in the first cooling loop, a temperature at a second position in the inverter, and a power loss of the inverter. In the solution of this application, data does not need to be separately calibrated for different thermal management systems. This reduces time consumed by data calibration and improves practicability.

Abstract: A power conversion device includes a housing with a mounting cavity, and the mounted cavity mounts a power element and a heat sink. The heat sink includes a thermally conductive plate which is mounted in the housing. The thermally conductive plate includes a first side in a first direction of the thermally conductive plate, where the first side has a heat source assembly region, and where the power element is disposed in the heat source assembly region and is in thermal contact with the thermally conductive plate. The thermally conductive plate has at least one sealed chamber, where the chamber is provided with flow channels that are spaced apart, and a two-phase cooling medium is accommodated in the flow channel. The flow channel includes a first end and a second end spaced apart in a third direction, and the first end is located above the second end.

Abstract: This application provides a heat exchange device and a heat exchange system. The heat exchange device has a first heat exchange mode, and includes a housing, a partition plate, an evaporator, and a compressor. The partition plate divides space inside the housing into an internal circulation cavity and an external circulation cavity. The evaporator and the compressor are located in the internal circulation cavity. A first valve group is disposed between an inlet of the compressor and an outlet of the evaporator. When the first heat exchange mode is used for heat exchange, the evaporator is communicated with the compressor by using the first valve group. In this application, the compressor is disposed in the internal circulation cavity, so that a temperature difference between the compressor and the evaporator is small, thereby reducing a slugging risk of the compressor.

Abstract: A liquid cooling plate includes a housing, a support structure, and a coolant. The housing includes a top wall and a bottom wall, the top wall and the bottom wall are covered to form an accommodation cavity, and the accommodation cavity includes a first region and a second region. The support structure is disposed in the first region and is located between the top wall and the bottom wall. The coolant flows in the accommodation cavity to dissipate heat from a heat generating device, the coolant can expand in volume when being heated and shrink in volume when being cooled, and the second region can deform to absorb a volume variation of the coolant.

Abstract: In one embodiment, a method includes accessing a plurality of images of a region of interest of a person's skin and extracting, from the plurality of images, a color signal of the region of interest as a function of time. The method further includes determining, based at least on the color signal, a first quality associated with an estimated vital sign of the person, where the vital sign estimate is determined from the plurality of images.

Abstract: A smart warning system for nursing beds includes a main body shell, a button switch, a control circuit board, a pull-cord switch, a power module and a warning device. The main body shell is secured to a headboard. The control circuit board and the power module are arranged in the main body shell. The pull-cord switch is arranged on the main body shell. The button switch is arranged on the main body shell. The control circuit board is wirelessly connected to the warning device. The warning device includes a voice interaction control module. The voice interaction control module is wirelessly connected to external terminals. There is further provided a pull-cord switch which can be triggered by the user regardless of any position on the bed in an emergency. The voice interaction control module is connected to the Internet of Things, which automatically dials for emergency contact.

Abstract: Provided is a heat exchanger, including a plurality of heat exchange members arranged in a first direction so as to be spaced apart from each other. Each of the plurality of heat exchange members includes: a heat transfer pipe extending in a second direction intersecting with the first direction; and a heat transfer plate provided to the heat transfer pipe along the second direction. The heat transfer plate includes extending portions extending away from the heat transfer pipe in a third direction intersecting with each of the first direction and the second direction. The heat transfer plate is formed separately from the heat transfer pipe.

Abstract: In a heat exchanger, each of a plurality of heat exchange members includes: a flat pipe; and a heat transfer plate integrated with the flat pipe along a longitudinal direction of the flat pipe. A width direction of each of the flat pipes intersects with a direction in which the plurality of heat exchange members are arranged side by side. Each of the heat transfer plates includes an extending portion extending outward in the width direction of each of the flat pipes from at least one of one end of a corresponding one of the flat pipes in the width direction and another end of the corresponding one of the flat pipes in the width direction. Each of the flat pipes has one or more flat pipe bent portions, each forming a groove extending along the longitudinal direction of the flat pipes.