Patent ID: 11906382
Assignee: VOLKSWAGEN AKTIENGESELLSCHAFT
Field: Measurement (Instruments)
Classification: CPC G  H  Y | IPC G  H

Claim 0:
1. A method for determining the amount of a gas present in a battery cell, whereby the battery cell has an initial volume, and the method comprises at least the following steps:
a) immersing the battery cell into a non-conductive liquid having a defined density at a first ambient pressure;
b) generating a lifting force that acts in the opposite direction of a downforce of the battery cell;
c) changing the first ambient pressure to a second ambient pressure, and measuring the buoyancy force—which is dependent on ambient pressure—of the battery cell in the liquid; and
d) measuring an amount of gas present in the battery cell, taking into account the first and second ambient pressures, the buoyancy forces ascertained for these ambient pressures, the temperature of the non-conductive liquid and the density of the liquid,
whereby any measurement of parameters during steps a), b) and c) is carried out in a sealed pressure chamber.