Battery Charging Voltage Adjustment for Capacity Fade Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery management systems (BMS) for lithium-ion batteries can only delay the decline of battery capacity but cannot prevent it entirely.
Innovation Solution
A method and apparatus that determine the historical capacity decline of a lithium-ion battery based on discharging parameters, calculate a full charge voltage to compensate for this decline, and charge the battery accordingly to ensure it reaches full charge without further capacity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery is charged to a fixed preset upper limit (80%-90% of nominal capacity), then the charging control is simple and safe, but the battery capacity will inevitably decline with aging
Solution Approach 1:
The patent applies dynamics by making the full charge voltage dynamic rather than fixed. The full charge voltage is adjusted based on the battery's historical capacity decline, allowing the charging system to adapt to the battery's aging state. This resolves the contradiction by enabling capacity maintenance through voltage adjustment while keeping the control logic relatively simple.
Solution Approach 2:
The patent changes the charging parameter (full charge voltage) based on the battery's aging state. By calculating the historical capacity decline and adjusting the full charge voltage accordingly, the system can maintain battery capacity without requiring complex control mechanisms. This parameter change approach directly addresses the technical contradiction.
2Reliability
If the full charge voltage is increased to compensate for capacity decline, then the battery can reach full charge, but the battery safety may be compromised
Solution Approach 1:
The patent implements feedback by continuously monitoring the battery's capacity decline through discharging parameters and using this information to adjust the full charge voltage. This closed-loop feedback mechanism ensures that the voltage is increased only to the extent necessary for capacity compensation, avoiding excessive voltage that would compromise safety.
Solution Approach 2:
The patent applies preliminary action by calculating the historical capacity decline before charging and determining the appropriate full charge voltage in advance. This allows the system to set the optimal charging voltage before the charging process begins, ensuring both capacity maintenance and safety without requiring real-time voltage adjustments during charging.
3Duration of action of stationary object
If the battery undergoes deep discharging to reduce capacity fading, then the battery longevity improves, but the battery lifespan is reduced
Solution Approach 1:
The patent applies periodic action by implementing a cyclic process of discharging, calculating capacity decline, and charging with adjusted voltage. This periodic approach allows the battery to undergo controlled discharge cycles while receiving compensatory charging, thereby extending service life without sacrificing capacity retention.
Data Source
AI summary
Embodiments of this application provide a battery, an electric apparatus, a battery charging method, and an apparatus for charging a battery. The technical solutions provided by the application belong to the field of battery charging technologies. In this application, a historical capacity decline of the battery is determined based on capacity decline in a k-th discharging process and a capacity decline in previous k−1 discharging processes, a full charge voltage in an m-th charging process is determined based on the historical capacity decline, and then m-th charging is performed, based on the determined full charge voltage in the m-th charging process, on the battery. Because the historical capacity decline increases constantly with the use of the battery, in this application, the full charge voltage of the battery in the charging process is increased constantly, or the full charge voltage is opened up constantly.