Electric car vehicle power battery large-power direct current electric energy metering method

A technology for power batteries and electric vehicles, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of high power consumption, low measurement accuracy, and affecting the measurement accuracy of measurement devices, achieving strong practicability and high precision , The effect of wide voltage measurement range

CN106646251AInactive Publication Date: 2017-05-10BEIJING STATE GRID PURUI EXTRA HIGH VOLTAGE POWER TRANSMISSION TECH CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-05-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to an electric car vehicle power battery large-power direct current electric energy metering method. The method comprises the following steps: the step 1) sampling the charging and discharging current of the power battery through a current sampling module; the step 2) sampling the charging and discharging voltage of the power battery though a voltage sampling module; the step 3) converting the sampled charging and discharging current and the charging and discharging voltage through an electric energy metering module and inputting the converted charging and discharging current and the charging and discharging voltage into a processor module; and the step 4) performing data reading of the inputted sampling current and voltage and converting the sampling current and voltage to electric quantity signals through the processor module and displaying the electric quantity on the interface of a master control device in the curve display mode. The electric car vehicle power battery large-power direct current electric energy metering method is high in electric quantity metering precision of the battery and high in practicality, and can realize the comprehensive accurate calculation of the dual-directional electric energy of the electric car.
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Description

technical field

[0001] The invention relates to a method for measuring high-power DC electric energy of a vehicle-mounted power battery of an electric vehicle. Background technique

[0002] With the popularization of electric vehicles, the monitoring of battery power of electric vehicles has become a concern of electric vehicle users. Electric vehicles currently in use do not have a unified standard metering device for the high-power DC power of the on-board power battery, and most of the DC power metering devices currently in use mainly use simple mechanical monitoring and measurement, which has the disadvantages of large power consumption and measurement accuracy. Low, regular calibration is required, and severe vibration during driving will affect the measurement accuracy of the metering device, which cannot meet the electric energy metering needs of electric vehicles. Contents of the invention

[0003] The purpose of the present invention is to provide a method for me...

Examples

Embodiment Construction

[0028] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0029] A method for measuring the high-power DC electric energy of the vehicle-mounted power battery of an electric vehicle according to the present invention, such as figure 1 shown, including the following steps:

[0030] 101. Sampling the charging and discharging current of the power battery through the current sampling module;

[0031] 102. Sampling the charging and discharging voltage of the power battery through the voltage sampling module;

[0032] The voltage sampling module includes a precision resistor for voltage division conversion of the measured voltage and a voltage instrumentation amplifier module for modulating the magnification of the voltage divided by the precision resistor;

[0033] The linearity of the precision resistor is 0.2%, and the temperature drift coefficient is 55ppm / K.

[0034] The voltage instrumentation amplifier module inclu...