Battery Charging Control via Weighted State Balancing
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Solution Overview
Problem
Repeating charging and discharging cycles in batteries lead to chemical and aging differences between cells, causing voltage and capacity deviations, resulting in overcharging or over-discharging, which reduces battery capacity and lifespan.
Innovation Solution
A processor-implemented method that determines state information of battery units, calculates weights based on sensed physical quantities and correspondence values, and generates control information to balance charging, ensuring equal charging of all units despite unequal state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If uniform charging is applied to all battery units, then charging simplicity is maintained, but battery units with different states experience overcharging or over-discharging, reducing battery lifespan
Solution Approach 1:
The patent applies local quality by determining state information (charge state, available capacity, temperature) for each battery unit individually and calculating specific weights for each unit based on their unique states. This allows differential charging control where each battery unit receives customized charging parameters rather than uniform treatment, preventing overcharging or over-discharging of specific units while maintaining overall system reliability.
2Reliability
If differential charging control based on state information is implemented, then battery lifespan is extended, but control system complexity increases
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting charging parameters (charging current, voltage) based on determined state information and calculated weights. The control system modifies charging parameters in real-time according to the charge state, available capacity, and temperature of each battery unit, allowing extended battery lifespan through adaptive control without requiring fundamentally complex system architecture.
Solution Approach 2:
The patent employs feedback mechanisms by continuously determining state information of battery units during charging, comparing actual states with target states, and adjusting charging parameters accordingly. The control system uses feedback from charge state, available capacity, and temperature measurements to calculate appropriate weights and modify charging control information, ensuring reliable battery operation through closed-loop control.
3Use of energy by moving object
If charging parameters are adjusted based on state information, then energy utilization efficiency is improved, but measurement and detection difficulty increases
Solution Approach 1:
The patent applies universality by using a multi-functional control system that performs multiple tasks: determining charge state, measuring available capacity, monitoring temperature, calculating weights, and adjusting charging parameters all within a single integrated system. This universal approach improves energy utilization efficiency by comprehensively managing multiple battery parameters simultaneously without requiring separate specialized measurement systems for each parameter.
Data Source
AI summary
A method of controlling the charging of a battery includes determining plural pieces of state information of a battery unit based on a sensed physical quantity of the battery unit, calculating a weight of the battery unit based on the pieces of state information and a correspondence value of each of the plural pieces of state information, and defining, based on the weight, control information corresponding to an input physical quantity in a charging physical quantity of the battery unit, where the input physical quantity is input to a converter of the battery unit.