Dynamic Battery Charge Control via Deterioration Estimation
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Solution Overview
Problem
Existing battery management systems fail to accurately adapt charge/discharge conditions based on the state of secondary batteries, leading to inefficient performance and accelerated deterioration due to uniform conditions applied throughout a battery's life, regardless of its usage and internal state.
Innovation Solution
A charge/discharge control apparatus that calculates and updates conditions of use for secondary batteries based on inner state parameters and deterioration models, integrating a CPU circuit to control charging and discharging, estimate battery characteristics, and acquire deterioration information to optimize voltage, current, and state of charge ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform conditions of use are applied throughout the battery life, then the battery control is simplified, but the battery performance is not sufficiently utilized in the initial period and deterioration is accelerated in the final period
Solution Approach 1:
The patent applies dynamics by transitioning from static uniform conditions of use to dynamic adaptive conditions. The system continuously monitors battery state (SOC, temperature, current) and adjusts charge/discharge conditions in real-time based on the battery's current state and estimated deterioration level, allowing optimal performance extraction while preventing accelerated deterioration
Solution Approach 2:
The patent changes parameters by adjusting conditions of use (voltage width, current limits, SOC ranges) based on estimated battery deterioration. The system calculates appropriate parameter values dynamically according to the battery's state and deterioration level, rather than using fixed parameters throughout the battery lifecycle
2Productivity
If narrow voltage width is set to maximize battery performance in initial period, then productivity is improved, but deterioration is accelerated in final period
Solution Approach 1:
The voltage width and other conditions of use are made dynamic rather than fixed. The system adjusts these parameters continuously based on real-time battery state monitoring and deterioration estimation, allowing wide voltage width for high performance when battery is healthy, and narrowing it when deterioration is detected to extend battery life
Solution Approach 2:
The system changes operational parameters (voltage width, current limits, SOC ranges) according to the battery's deterioration level. When the battery is in initial period with low deterioration, wider voltage width is permitted for maximum performance. As deterioration progresses, parameters are adjusted to reduce stress on the battery, extending its operational life
3Duration of action of stationary object
If wide voltage width is set to extend battery life, then duration of action is improved, but battery performance is not sufficiently utilized in initial period
Solution Approach 1:
The system dynamically adjusts voltage width based on real-time battery state and deterioration estimation. In the initial period when battery is healthy, wide voltage width is applied for maximum performance. As deterioration progresses, the system adaptively narrows the voltage width to reduce stress and extend battery life, achieving both goals at different times
4Duration of action of stationary object
If conditions of use are changed according to battery state, then battery life is extended, but it is difficult to accurately estimate present deterioration due to various deterioration factors
Solution Approach 1:
The system implements feedback by continuously monitoring battery state (SOC, temperature, current, voltage) and using this information to update deterioration estimation. The estimated deterioration then feeds back into adjusting conditions of use, creating a closed-loop system that adapts to actual battery state while compensating for the difficulty of accurate deterioration measurement
Solution Approach 2:
The patent introduces an intermediary approach by using multiple indirect indicators (SOC, temperature, current, voltage) to estimate deterioration rather than attempting direct measurement. The system combines these multiple indirect measurements with deterioration models to infer the battery's health state, overcoming the limitation of not being able to directly measure deterioration caused by various factors
Data Source
AI summary
A charge/discharge control apparatus according to one aspect of the present invention is an apparatus that controls charge or discharge of a secondary battery to be charged or discharged on the basis of at least one condition of use calculated from a deterioration model or a deterioration map of a secondary battery and at least one inner state parameter of the secondary battery to be charged or discharged. The charge/discharge control apparatus updates the condition of use on the basis of change of the inner state parameter.