A device unit is provided with a first heating element, a second heating element configured to generate a heat in an amount smaller than that generated by the first heating element, and a cooler located between the first heating element and the second heating element. The cooler has a coolant flow passage through which a coolant flows, and cooling fins disposed on a first heating element side in the coolant flow passage in a manner as to be substantially in parallel with a flow direction of the coolant, and a fluid resistance of the coolant in the coolant flow passage is smaller on a second heating element side than on the first heating element side.

A hybrid vehicle having an electric drive with a power accumulator, a fuel cell, and a control unit configured to control the operation of the fuel cell. The control unit has logic, at least partially including hardware configured to activate and deactivate the fuel cell as a function of a first characteristic map having a first input variable representing a present power demand of the hybrid vehicle which exists over a first defined observation time range.

The present invention provides a hybrid vehicle, including a power battery, a fuel storage tank, an electrical power generation unit, a pressure detection unit and a work mode controller, and adopts a pressure protection mode under the work mode controller, wherein the work mode controller is configured to control the vehicle to enter the pressure protection mode when the electrical power generation unit is in a stop state and when the gas pressure detected by the pressure detection unit is higher than a pressure threshold; and in the pressure protection mode, the electrical power generation unit is started from the stop state to enter the working state to consume the fuel in the fuel storage tank, and the gas pressure in the fuel storage tank is accordingly reduced. As the pressure protection mode is adopted in the present invention, the electrical power generation unit can be automatically started according to the gas pressure of the fuel in the fuel storage tank to charge the power battery using the expanded redundant fuel. The safety problem and the waste resulting from the fact that the expanded fuel exceeding the threshold in the fuel storage tank is discharged into the atmosphere in the prior art are avoided.

In one embodiment, a positive electrode is formed by a process that includes forming a slurry including particles dispersed within a liquid from a electrode formulation and the liquid such that the particles have a particle size distribution D.sub.50 of 15 microns or less, coating the slurry on a collector; and drying the coated collector to form the positive electrode. The electrode formulation includes an electrode active material, a conductive carbon source, an organic polymeric binder, and a water-soluble polymer. The liquid consists essentially of water or a mixture of water and an alcohol. When the liquid consists essentially of the mixture, the alcohol is present in an amount of less than 10% by weight, based on the weight of the slurry. When the liquid consists essentially of water, the slurry is formed from the electrode formulation, the liquid, and an arene-capped polyoxoethylene surfactant.

A self-propelled work machine includes an undercarriage provided with drive wheels driven by a drive device. An upper structure is rotatably mounted on the undercarriage. A drive unit is arranged in the undercarriage and a boom for a work tool is mounted on the undercarriage. The drive unit drives a power generator that is a power source for an electric motor arranged in the upper structure, the electric motor being the drive device for the drive wheels arranged on the undercarriage.

A hybrid vehicle having an electric drive with a power accumulator, a fuel cell, and a control unit configured to control the operation of the fuel cell. The control unit has logic, at least partially including hardware configured to activate and deactivate the fuel cell as a function of a first characteristic map having a first input variable representing a present power demand of the hybrid vehicle which exists over a first defined observation time range.

The present invention provides a hybrid vehicle, including a power battery, a fuel storage tank, an electrical power generation unit, a pressure detection unit and a work mode controller, and adopts a pressure protection mode under the work mode controller, wherein the work mode controller is configured to control the vehicle to enter the pressure protection mode when the electrical power generation unit is in a stop state and when the gas pressure detected by the pressure detection unit is higher than a pressure threshold; and in the pressure protection mode, the electrical power generation unit is started from the stop state to enter the working state to consume the fuel in the fuel storage tank, and the gas pressure in the fuel storage tank is accordingly reduced. As the pressure protection mode is adopted in the present invention, the electrical power generation unit can be automatically started according to the gas pressure of the fuel in the fuel storage tank to charge the power battery using the expanded redundant fuel. The safety problem and the waste resulting from the fact that the expanded fuel exceeding the threshold in the fuel storage tank is discharged into the atmosphere in the prior art are avoided.