Storage Battery Charging Control Voltage Determination
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Solution Overview
Problem
Storage battery systems, particularly those with lithium ion batteries, face significant deterioration in high-temperature, highly-charged states, leading to reduced capacity and cumulative capacity over their lifespan when only focused on deterioration suppression, rather than optimizing charge state control.
Innovation Solution
A storage battery system charging control device that estimates cumulative capacity until the end of life, using power and temperature data to calculate optimal charging control voltages, thereby balancing battery life and economy by managing the state of charge to maximize cumulative capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charge state is reduced to suppress deterioration, then battery life is improved, but cumulative capacity is reduced
Solution Approach 1:
The patent implements dynamic charge state control that adjusts charging strategies based on real-time temperature conditions and battery aging stage. The control device transitions from static charge limits to dynamic adjustment, where charge state targets are modified according to temperature thresholds and estimated remaining life, enabling optimization of both longevity and cumulative capacity throughout the battery lifecycle.
Solution Approach 2:
The patent changes the control parameter from fixed charge voltage limits to dynamic charge state targets that incorporate temperature compensation and aging-stage adjustment. By modifying charge state targets based on temperature conditions and estimated remaining life parameters, the system achieves optimal balance between deterioration suppression and capacity utilization without requiring fixed conservative charge limits.
2Reliability
If charge voltage is controlled to reduce deterioration, then initial stage deterioration is suppressed, but charging/discharging control expansion is limited
Solution Approach 1:
The patent transitions from static charge voltage control to dynamic charge state control that adapts to different operating conditions. The control device adjusts charge state targets based on temperature stages and aging progression, enabling expanded charging/discharging control strategies that go beyond simple voltage clipping while maintaining deterioration suppression benefits.
Solution Approach 2:
The patent performs preliminary estimation of remaining life and temperature trajectory before executing charging/discharging control. By calculating estimated remaining life in advance and predicting temperature stages, the control device can proactively adjust charge state targets to prevent deterioration while maximizing cumulative capacity utilization throughout the battery lifecycle.
Data Source
AI summary
In a storage battery system charging control device, on the basis of estimated temperature data until the end of life of a storage battery calculated by a power estimation unit, an ambient temperature estimation unit, and a temperature estimation unit, and a deterioration coefficient stored in a data storage unit, a capacity retention calculation unit sequentially calculates capacity retention data with respect to each state of charge until the end of life of the storage battery, using the state of charge as a parameter. A cumulative capacity calculation unit calculates a cumulative capacity corresponding to each state of charge, on the basis of the rated capacity of the storage battery and the capacity retention data. A charging control voltage determination unit determines charging control voltage on the basis of the cumulative capacities calculated by the cumulative capacity calculation unit.