Battery Potential Deviation Restoration Control
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Solution Overview
Problem
Lithium-ion secondary batteries experience capacity reduction due to physical deterioration and deviation of positive/negative-electrode electric potentials from their reference state, leading to reduced battery performance over time.
Innovation Solution
A charge and discharge control device that acquires information on positive/negative-electrode electric potentials, determines deviations from a reference state, and holds the state of charge within a restoration range to bring the potentials back to the initial state, thereby restoring capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium-ion secondary battery undergoes repetition of charge and discharge or long-time storage, then battery capacity is reduced due to physical deterioration and deviation of electric potentials, but the battery structure and materials remain unchanged
Solution Approach 1:
The control device performs preliminary detection of electric potential deviation before significant capacity loss occurs. By monitoring positive and negative electrode potentials during charge/discharge cycles and comparing them against reference values, the system identifies deviation early and initiates restoration charging procedures to correct the imbalance before it causes permanent damage to battery capacity.
Solution Approach 2:
The system continuously monitors battery electric potentials during operation and uses this feedback to determine when restoration charging is needed. The control device compares real-time potential measurements against predetermined reference values, and automatically adjusts charging parameters to restore potentials to their reference state, creating a closed-loop control system that maintains optimal battery performance.
2Ease of operation
If conventional charge and discharge control methods are used, then battery operation is simple, but capacity reduction due to electric potential deviation cannot be properly detected or restored
Solution Approach 1:
The patent replaces conventional voltage-based control methods with an electric potential-based control system. Instead of merely monitoring terminal voltage, the system measures and controls the actual electric potentials of individual electrodes relative to a reference potential, enabling more precise detection and restoration of capacity loss mechanisms that were previously undetectable through conventional methods.
Solution Approach 2:
The control device introduces an intermediary reference potential that serves as a baseline for measuring electrode potentials. This reference potential acts as a mediator between the complex electrochemical processes within the battery and the control system, enabling accurate detection of potential deviations and facilitating automated restoration charging to maintain battery health.
Data Source
AI summary
According to one embodiment, information related to a positive-electrode electric potential and a negative-electrode electric potential of each of one or more batteries is acquired, and whether deviation of the positive/negative-electrode electric potentials from a reference state is beyond a prescribed range is determined for each of one or more batteries. Further, in response to at least existence of a battery-to-be-restored that is a battery in which the determined deviation of positive/negative-electrode electric potentials from a reference state is beyond a prescribed range, a state of charge of the battery-to-be-restored is held in a restoration holding range for a prescribed time.