DC Converter Voltage Control for Battery Overcharge Prevention
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Solution Overview
Problem
Lithium batteries in low voltage power supply systems of new energy vehicles are prone to overcharging during load dump events, leading to lithium ion precipitation and reduced service life.
Innovation Solution
A voltage control method that generates a voltage control signal based on the operating conditions of the DC converter and the battery, controlling the output voltage of the DC converter to be less than the maximum charging voltage of the battery, thereby preventing overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the DC converter output voltage is allowed to increase during load dump events, then the charging speed and power delivery improve, but the battery becomes overcharged causing lithium ion precipitation and reduced service life
Solution Approach 1:
The control method continuously monitors the output voltage of the DC converter and dynamically adjusts the charging process based on real-time voltage conditions. When voltage exceeds the maximum charging voltage threshold during load dump events, the system automatically reduces or stops charging current, creating a closed-loop feedback control that prevents overcharging while maximizing charging speed under normal conditions
Solution Approach 2:
The charging system transitions from a static voltage control approach to a dynamic control strategy that adapts to changing operating conditions. The control method adjusts charging parameters in real-time based on the instantaneous output voltage of the DC converter, allowing the system to optimize charging speed when voltage is within safe limits while preventing damage when voltage spikes occur during load dump events
Data Source
AI summary
The voltage control method includes: generating a voltage control signal according to a first operating condition information of a direct current converter and a second working operating information of a battery; and according to the voltage control signal, controlling an output voltage of the direct current converter to be less than the maximum charging voltage of the battery.