Battery SOC Range Switching to Reduce 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 active materials, necessitating a method to reduce this deterioration without interrupting operation.
Innovation Solution
The battery is operated in multiple shifted SOC ranges, with sequential switching between these ranges to prevent continuous operation in a single narrow range, using a processing circuit to control charging and discharging within defined SOC limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the battery is charged and discharged in a narrow SOC range (e.g., SOC width of 50% or less), then the battery operation is simplified and suited for specific usage modes, but the deterioration of the battery is accelerated
Solution Approach 1:
The patent applies dynamics by making the SOC range dynamic rather than fixed. The operation SOC range is determined based on a reference SOC range and adjustment values that are updated over time. This allows the battery to operate in a narrow SOC range for simplicity while periodically adjusting the range to prevent long-term deterioration, thus resolving the contradiction between ease of operation and battery durability
Solution Approach 2:
The patent changes the parameter of SOC range by introducing adjustment values (first and second adjustment values) that modify the reference SOC range. These parameters are dynamically adjusted based on operation history and conditions, allowing the system to maintain simple narrow-range operation while preventing deterioration through parameter evolution over time
2Productivity
If the battery is repeatedly charged and discharged in a specific SOC range with narrow SOC width, then the operation is convenient for specific usage modes, but the progress of deterioration is accelerated
Solution Approach 1:
The patent implements periodic action through the sequential determination of adjustment values based on operation history. The SOC range is adjusted periodically rather than continuously, allowing efficient operation in a stable range while preventing deterioration through periodic adjustments. This resolves the contradiction by maintaining high productivity during stable operation while protecting battery lifespan through periodic interventions
Solution Approach 2:
The operation SOC range transitions from a static fixed range to a dynamic adaptive range that evolves with usage. The range remains stable during normal operation for efficiency but adapts over time to prevent deterioration, achieving both high productivity and extended battery lifespan through dynamic adjustment
3Reliability
If multiple SOC ranges are set and sequentially switched, then the battery deterioration is reduced, but the control complexity increases
Solution Approach 1:
The patent segments the SOC range into multiple adjustment values (first adjustment value, second adjustment value, etc.) that can be sequentially applied. Each adjustment value represents a segment of the overall adjustment strategy, making the complex control task manageable through division into discrete, sequential steps while still achieving the goal of reducing battery deterioration
Solution Approach 2:
The patent prepares multiple adjustment values in advance based on a reference SOC range, then sequentially applies them during operation. This preliminary preparation simplifies the control process by having pre-calculated adjustment options ready, reducing the need for complex real-time calculations while maintaining battery durability through systematic range adjustment
Data Source
AI summary
In an operating method of a battery in an embodiment, one of a plurality of SOC ranges shifted from each other is selected as an operation SOC range, and the battery is operated in the SOC range selected as the operation SOC range. In the operation method, the SOC range selected as the operation SOC range is sequentially switched between the plurality of SOC ranges.