Battery Charging Control With Aging-Based Cut-Off Voltage
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Solution Overview
Problem
Aging of batteries leads to a decline in chargeable capacity, and existing charging methods do not effectively account for changes in the correspondence between voltages and states of charge, resulting in reduced battery performance.
Innovation Solution
A charging method that determines a preset voltage threshold based on the aging state of the battery, adjusts the charge cut-off voltage accordingly, and monitors the update frequency of the charge cut-off voltage to maintain battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the charge cut-off voltage is kept constant for a fresh battery, then the battery can be charged to full capacity initially, but as the battery ages, the chargeable capacity declines due to aging and polarization
Solution Approach 1:
The patent applies dynamics by making the charge cut-off voltage adjustable rather than fixed. The system dynamically adapts the charge cut-off voltage based on the battery's aging state, transitioning from a static parameter to a dynamic one that evolves with battery condition. This allows the charging system to optimize for both initial capacity and long-term durability.
Solution Approach 2:
The patent changes the parameter of charge cut-off voltage based on battery aging state. By monitoring battery characteristics and adjusting the voltage threshold accordingly, the system compensates for aging effects. This parameter adaptation enables maintaining optimal charging conditions throughout the battery's lifecycle, addressing both capacity and duration requirements.
2Duration of action of stationary object
If the charge cut-off voltage is increased to compensate for capacity loss, then the usable time may be extended, but lithium precipitation and overcharge risks increase
Solution Approach 1:
The patent implements feedback by continuously monitoring battery state and using this information to adjust the charge cut-off voltage. The system measures battery characteristics, compares them against reference data, and dynamically modifies charging parameters accordingly. This closed-loop control prevents both undercharging and overcharging, maintaining reliability while extending usable time.
Solution Approach 2:
The patent applies preliminary action by pre-establishing reference correspondence relationships between voltage and state of charge for batteries at different aging stages. Before actual charging occurs, the system determines the appropriate charge cut-off voltage based on the battery's current state, preventing potential issues like lithium precipitation before they can occur during charging.
3Measurement precision
If the correspondence between voltage and state of charge is not updated with battery aging, then the charging control remains simple, but the charging accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-establishing reference correspondence relationships between voltage and state of charge for batteries at different aging stages. These reference data are prepared in advance, allowing the system to quickly determine appropriate charging parameters without complex real-time calculations, thus maintaining simplicity while improving accuracy.
Solution Approach 2:
The patent changes the voltage-state of charge correspondence parameters based on battery aging state. By updating these parameters according to monitored battery characteristics, the system maintains high charging accuracy without requiring a completely complex control system, as it builds upon the existing framework with adaptive parameter adjustment.
Data Source
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AI summary
This application provides a charging method and apparatus, a vehicle, and a computer-readable storage medium. The method includes: obtaining a current-time voltage of a target battery; determining a current-time power of the target battery based on the current-time voltage; determining a chargeable power of the target battery based on the current-time power; and obtaining a real-time voltage of the target battery where the target battery is charged with the chargeable power, where the real-time voltage is used for determining a charge cut-off voltage of the target battery in a next charging.