Car-mounted low-voltage battery charging method

A technology of low-voltage battery and charging method, which is applied in battery circuit devices, charging/discharging current/voltage regulation, collectors, etc., can solve the problems of shortened service life of batteries, dangerous accidents, and low charging efficiency, so as to ensure charging safety, Avoid dangerous accidents and achieve high charging efficiency

Inactive Publication Date: 2019-01-04
科力远混合动力技术有限公司
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  • Claims
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AI Technical Summary

Problems solved by technology

When the ambient temperature of the vehicle is too high, unreasonable charging current will cause the temperature of the low-voltage battery to rise too fast, which may exceed the maximum allowable temperature of the battery, resulting in low charging efficiency, shortened battery life, and dangerous accidents.
At present, the control of low-voltage batteries is concentrated in the start-up stage

Method used

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  • Car-mounted low-voltage battery charging method
  • Car-mounted low-voltage battery charging method

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Embodiment 1

[0019] A method for charging a vehicle-mounted low-voltage storage battery, the control flow chart of which is as follows figure 1 shown, proceed as follows:

[0020] S1: The vehicle controller controls the output current of the DC / DC converter to be I 0 , the output voltage is U 0 Charge the battery with constant current and constant voltage; the output current I of the DC / DC converter 0 The value range of is 38~70A, the I of this embodiment 0 The value is 50A, the output voltage U 0 The value range of is 12.75~14.0V, the U of this embodiment 0 The value is 13.7V;

[0021] S2: During the charging process, the charging voltage, charging current and battery temperature of the battery are detected in real time, and the detected data of the charging voltage, charging current and battery temperature of the battery are transmitted to the vehicle controller, and then the vehicle controller sends The received data is forwarded to the man-machine interface for real-time display

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Abstract

The invention provides a car-mounted low-voltage battery charging method. Firstly, a vehicle controller controls the output current of the DC/DC converter to be I0, the output voltage is U0 to chargethe battery with constant current and constant voltage, if the battery temperature is detected to be greater than the battery alert temperature at some point in time, judging whether the battery temperature at the time is smaller than the battery temperature at the previous time, if yes, calculating a difference T between the battery temperature at that time and the battery temperature at the previous time, and the charging current IPID of the battery is calculated by using T and PID algorithm, after that, the vehicle controller controls the output current of the DC/DC converter to change to IPID, and the output voltage remains unchanged at U0 to charge the battery. If it is detected that the battery temperature is higher than the maximum allowable charging temperature of the battery at acertain time, the charging is terminated; otherwise, the battery temperature is cyclically judged, and different currents are used to charge the battery. The method of the invention is simple and feasible, can improve charging efficiency and avoid excessive temperature of the battery.

Description

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Claims

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Application Information

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Owner 科力远混合动力技术有限公司
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