Multi-Stage Constant Current Battery Charging Control
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Solution Overview
Problem
The existing charging process is prolonged due to a long constant voltage charging stage, which wastes time and reduces charging speed, as it maintains charging voltage below the battery's rated voltage throughout the entire process.
Innovation Solution
Implementing a charging control method that performs multiple constant current charging stages, where each stage charges the battery to a preset voltage greater than the rated voltage, and stops charging when the Kth stage's voltage is reached, thereby eliminating the constant voltage charging stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant voltage charging is performed until charging cut-off condition is satisfied, then battery safety is ensured, but charging duration becomes long
Solution Approach 1:
The charging process is segmented into multiple constant current charging stages instead of using a single constant voltage charging stage. Each stage charges the battery to a different voltage level, with the final stage allowing voltage to exceed the rated voltage. This segmentation eliminates the need for prolonged constant voltage charging while ensuring battery safety through controlled progression through defined charging phases.
Solution Approach 2:
The charging voltage parameter is dynamically changed throughout the charging process. In the Kth constant current charging stage, the charging voltage is allowed to exceed the battery's rated voltage and reach a higher charging cut-off voltage. This parameter change enables faster charging by removing the voltage constraint that limits charging speed in traditional constant voltage charging, while still maintaining battery safety through controlled current and staged progression.
2Reliability
If charging voltage is kept below rated voltage throughout constant voltage charging stage, then battery safety is ensured, but charging speed is reduced
Solution Approach 1:
The charging voltage is made dynamic rather than static. Instead of maintaining a fixed voltage below the rated voltage throughout the charging process, the system dynamically adjusts the charging voltage in different stages. In the final constant current stage, the voltage dynamically increases to exceed the rated voltage and reach the charging cut-off voltage, enabling faster charging speed while maintaining safety through controlled current and staged progression.
3Loss of time
If multiple constant current charging stages are performed with preset voltage greater than rated voltage, then charging time is reduced, but charging control complexity increases
Solution Approach 1:
The charging process is divided into K distinct constant current stages, each with a preset voltage level. This segmentation allows the system to progress through controlled voltage increments, with the final stage allowing voltage to exceed the rated voltage. The segmentation provides a structured control approach that manages complexity by breaking down the charging process into manageable, predefined stages rather than requiring continuous complex control.
Data Source
AI summary
Embodiments of the present disclosure provide a charging control method, a charging control device and a device to be charged. The method includes: in a charging process, performing K constant current charging stages on a battery in the device to be charged, where K is a positive integer greater than or equal to 1; in each constant current charging stage, performing constant current charging on the battery with a preset current corresponding to the constant current charging stage until the battery is charged to a preset voltage corresponding to the constant current charging stage, wherein the preset voltage corresponding to the Kth constant current charging stage is a charging cut-off voltage greater than a rated voltage of the battery; and when the voltage of the battery reaches the charging cut-off voltage in the Kth constant current charging stage, stopping charging the battery.