Battery Pack Aging-Based Operational Limit Adjustment
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Solution Overview
Problem
Existing battery management systems struggle to accurately detect sudden cell failures in aged battery packs, particularly in lithium-ion cells, which can lead to dangerous situations due to internal cell defects that are not measurable through standard voltage, current, or temperature signals.
Innovation Solution
A method for operating a battery pack that determines a current intermediate characteristic value, such as energy throughput (ETP), to assess the aging state, compares it with predetermined values for end-of-safe-operation (EoS) and end-of-life (EoL), and adjusts operational limits to prevent overloading and extend the battery's safe usage time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard voltage, current, or temperature signals are used for detection, then the measurement system remains simple, but sudden cell failures in aged battery packs cannot be accurately detected
Solution Approach 1:
The patent introduces an intermediate characteristic value that serves as an early warning indicator for sudden cell failures. This value is calculated before actual failures occur, allowing the system to take preliminary actions to prevent dangerous situations. The intermediate characteristic value captures subtle changes in battery behavior that precede catastrophic failures, enabling early detection without requiring complex additional sensors.
Solution Approach 2:
The patent employs an intermediate characteristic value as a mediator between standard measurements and sudden cell failure detection. This intermediate value acts as a bridge, translating ordinary voltage, current, and temperature signals into predictive information about potential failures. Rather than directly detecting failures, the system uses this intermediate characteristic to infer upcoming failures, maintaining measurement system simplicity while improving detection accuracy.
2Reliability
If operational limits are kept constant, then the battery pack can operate at maximum capacity, but the risk of overloading aged battery cells increases
Solution Approach 1:
The patent makes operational limits dynamic by adjusting them based on the intermediate characteristic value. As the intermediate characteristic value changes with battery aging and usage conditions, the operational limits automatically adapt. This dynamic adjustment ensures that aged battery cells are not overloaded while allowing maximum operational capacity when the battery is healthy, thus resolving the contradiction between safety and productivity.
Solution Approach 2:
The patent changes operational parameters (voltage, current, temperature limits) based on the intermediate characteristic value. When the intermediate characteristic value indicates approaching failure conditions, the system adjusts operational parameters to reduce stress on battery cells. This parameter adaptation maintains safety by preventing overloading while preserving maximum operational capacity during normal conditions.
3Duration of action of stationary object
If the battery pack operates without adjusting operational limits based on aging, then productivity is maintained, but the service life of the battery pack is shortened
Solution Approach 1:
The patent extends battery service life by taking preliminary actions based on the intermediate characteristic value. Before actual failures occur, the system detects changes in the intermediate characteristic value and adjusts operational limits accordingly. This preliminary intervention prevents cumulative damage that would otherwise lead to premature battery failure, thereby extending service life without significantly impacting productivity.
Solution Approach 2:
The patent implements a feedback mechanism where the intermediate characteristic value continuously informs operational limit adjustments. As the battery ages and the intermediate characteristic value evolves, the system receives feedback about the battery's health state and相应 adjusts operational parameters. This closed-loop feedback ensures that productivity is maintained within safe boundaries, extending the battery's operational lifespan.
Data Source
AI summary
The present disclosure refers to a method for operating a battery pack, is provided. According to the method provided, a current intermediate characteristic value characterizing an aging state degree of the battery pack is determined based on a detected and/or obtained condition measurement signal. Afterwards, a comparison of the current intermediate characteristic value and a first predetermined value of the intermediate characteristic value is performed, wherein the first predetermined value includes a value of the intermediate characteristic value at which a predefined value of the aging state degree is undercut. Further, an operational limit for the battery pack is adjusted based on the comparison. Aspects provided further relate to a battery system including a battery pack, the battery system being configured for performing the disclosed method.