A breathable gas supply apparatus has a flow generator configured to pressurize a flow of breathable gas and a humidifier base unit configured to be coupled to the flow generator. A water container is configured to be removably coupled to the humidifier base unit and includes an air inlet and an air inlet passage extending into an interior of the water container from the air inlet. The air inlet passage is configured to direct the pressurized flow of breathable gas in a direction that is substantially parallel to a base of the water container. A barrier wall is provided across an outlet end of the air inlet passage and extends downward from the air inlet passage toward the water container base. In addition, a curved wall opposes both the outlet end of the air inlet passage and the barrier wall and extends downward toward the water container base. The breathable gas supply apparatus also includes a connector defining an airflow passage between an outlet of the flow generator and the air inlet of the water container.

The invention relates to a method for humidifying air in a supply air path (2) of a fuel cell system (1) by means of water injection, wherein product water produced on the cathode side is used, with said product water being separated from the humid exhaust air introduced into the exhaust air path (3) with the aid of a water separator (4) integrated into the exhaust air path (3), wherein, depending on the load, the liquid water content of the exhaust air is varied by means of the temperature of the exhaust air.

The invention also relates to a device for humidifying air in a supply air path (2) of a fuel cell system (1) and to a fuel cell system (1) comprising a device according to the invention.

An atomization circuit module includes a voltage stabilization module and a microcontroller module, an input terminal of the voltage stabilization module is connected to a power supply, an output terminal of the voltage stabilization module is connected to the microcontroller module, and the microcontroller module outputs pulse width modulation (PWM) signals with variable duty factors to control an atomization sheet to oscillate at a resonant frequency. An atomizer head includes the atomization circuit module, the atomization sheet, and a housing of the atomizer head, the atomization circuit module is electrically connected to the atomization sheet and the housing of the atomizer head, and the atomization circuit module and the atomization sheet are both disposed in the housing of the atomizer head.