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

Abstract

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 coupling modules, calculating the residual electric energy q of the power battery after single charging. According to the scheme, the real-time dynamically-changed self-discharge electric quantity of the power battery can be determined in real time, the total self-discharge amount of the power battery after single charging is calculated, and the accuracy of statistics of the battery remaining capacity of the power battery is improved.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of battery electric energy calculation, and in particular to a method and system for measuring high-power DC electric energy of a vehicle-mounted power battery. Background technique [0002] As people's awareness of environmental protection is getting stronger and stronger, electric vehicles have gradually become popular as a means of transportation. The monitoring of the battery power of electric vehicles has become a concern of electric vehicle users. Electric vehicles (BEV) refer to vehicles powered by on-board power supplies, driven by motors, and meeting the requirements of road traffic and safety regulations. Due to its smaller impact on the environment than traditional cars, its prospects are widely optimistic. [0003] At present, most of the methods for calculating the high-power DC electric energy of the vehicle-mounted power battery of electric vehicles are as described ...

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Problems solved by technology

[0005] To this end, the embodiment of the present invention provides a method and system for measuring high-power DC electric energy of a vehicle-mounted power battery. The multivariate relationship model among them can determine the real-time dynamic self-discharge quantity of the power battery in real time, calculate the total amount of self-discharge of the power battery after a single charge, and improve the accuracy of statistics on the remaining battery capacity of the power battery to solve the current problem. In the existing technology, the loss of battery self-discharge power is not considered, so the accuracy of calculating and counting the remaining battery capacity is low

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