Battery housing for a motor vehicle battery

A battery housing for a motor vehicle battery, said battery housing comprising:

• a housing for accommodating at least one battery cell in an interior space delimited by the housing,
• a drainage device which communicates with the interior space and which serves for discharging liquid and/or moisture out of the interior space of the housing,
• a detection device for detecting an air moisture content and/or a liquid fill level in the interior space of the housing,
• an evaluation unit which is connected to the detection device and which serves for ascertaining a liquid fill level and/or moisture content that can be dissipated via the drainage device, wherein the evaluation unit is connected to the drainage device and the drainage device is configured to open and/or close in a manner dependent on the liquid fill level and/or moisture content ascertained by the evaluation unit, and
• a pressure equalization valve, which is integrated in the drainage device or which is formed separately from the drainage device, that is configured for equalizing pressure in the interior space of the housing with surroundings,
• wherein the pressure equalization valve is connected to (i) the evaluation unit, (ii) an interior pressure sensor for detecting a pressure in the interior space of the housing, and (iii) an outside pressure sensor for detecting a pressure outside the housing,
• wherein the evaluation unit is configured to open the pressure equalization valve when the pressure detected by the outside pressure sensor is lower than the pressure detected by the interior pressure sensor,
• wherein the evaluation unit is configured to store a chronological course of a detected moisture content in the interior space of the housing over a defined minimum time period and to trigger an opening of the drainage device if a predefined threshold value for a derivative with respect to time of the detected moisture content is overshot, and wherein the predefined threshold value for the derivative is indicative of a leakage of liquid into the housing.