High-power direct-current electric energy metering method and system for vehicle-mounted power battery

The embodiment of the invention discloses a high-power direct-current electric energy metering method and system for a vehicle-mounted power battery. The method comprises the steps of: carrying out self-discharge pre-experiment on a power battery, and building a multivariate relation model between the self-discharge electric quantity W and the environmental parameters of an electric vehicle; dividing the load of the power battery into a plurality of coupling modules which are connected in parallel according to function association, and calculating the linear current of each coupling module inreal time by utilizing an electric energy metering unit; monitoring the initial total electric quantity C of the power battery after single charging in real time, and calculating the total energy consumption of the coupling modules in the use process of the power battery; and according to the self-discharge electric quantity W obtained by the multivariate relation model and the total power consumption Q of all the couplin