Shifted Battery SOC Window Control for Narrow-Range Degradation
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Solution Overview
Problem
Batteries deteriorate faster when charged and discharged in narrow SOC ranges, particularly when using certain electrode materials like lithium iron phosphate, necessitating a method to reduce this degradation without interrupting operation.
Innovation Solution
The battery is operated in a series of shifted SOC ranges, with sequential switching between these ranges to prevent continuous operation in a single narrow range, using a processing circuit to manage and control charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery is charged and discharged in a narrow SOC range to meet usage requirements, then the ease of operation is improved, but the reliability deteriorates due to accelerated battery degradation
Solution Approach 1:
The patent applies dynamics by making the SOC range dynamic rather than fixed. The operation SOC range is determined based on the degree of deterioration, which changes over time. The control device dynamically adjusts the upper and lower limits of the SOC range according to real-time battery state, transforming a static operation parameter into a dynamic one that adapts to battery aging, thereby resolving the contradiction between maintaining narrow SOC range operation and preventing degradation
Solution Approach 2:
The patent changes the parameter of SOC range limits based on the degree of deterioration. As the battery deteriorates, the control device modifies the upper and lower SOC thresholds, expanding or shifting the operation range. This parameter change approach allows the system to adapt to battery aging while maintaining appropriate operation constraints, addressing the contradiction between usage requirements and durability
2Productivity
If the battery operates in a specific narrow SOC range to satisfy usage modes, then the productivity is improved, but the object-affected harmful factors increase due to accelerated deterioration
Solution Approach 1:
The patent implements feedback by continuously monitoring the degree of deterioration and using this information to adjust the operation SOC range. The control device receives feedback on battery health status and modifies the SOC limits accordingly, creating a closed-loop control system that prevents harmful accumulation of degradation while maintaining productive operation within appropriate bounds
Data Source
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AI summary
An operation method of a battery (2), the method comprising: selecting one of a plurality of SOC ranges (X) shifted from each other as an operation SOC range, and operating the battery (2) in an SOC range (X) selected as the operation SOC range; and sequentially switching an SOC range (X) to be selected as the operation SOC range between the plurality of SOC ranges (X), wherein the switching includes switching an SOC range (X) to be the operation SOC range in response to a prescribed period (Tref) or more having elapsed from a time of starting an operation in an SOC range (X) selected as the operation SOC range, or in response to an integrated value (P) of an amount of electric power input to and output from the battery (2) from a time of starting an operation in an SOC range (X) selected as the operation SOC range being a prescribed amount (Pref) of electric power or more, and wherein the SOC range selected as the operation SOC range is different before and after the switching.