Battery Cell Impedance Isolation for Pack Imbalance Mitigation
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Solution Overview
Problem
Traditional battery packs experience performance and reliability issues due to individual cells degrading at different rates, leading to reduced efficiency and potential damage.
Innovation Solution
A battery imbalance mitigation system that isolates and diagnoses individual cells using complex impedance measurement, determining their state of health, and controls their connection based on health metrics to mitigate imbalances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual battery cells are used in a battery pack, then the battery pack can supply energy despite cell degradation, but the degraded cells reduce performance and reliability
Solution Approach 1:
The battery pack is segmented into individual monitorable units with isolation capability. Each battery cell or group is equipped with its own isolation unit and impedance measurement circuitry, allowing independent monitoring and isolation of degraded cells while maintaining operation of healthy cells, thus resolving the contradiction between reliability and performance
Solution Approach 2:
An impedance measurement system continuously monitors the state of health of individual battery cells and provides feedback to the control system. When degradation is detected beyond a threshold, the system automatically isolates the affected cell, creating a closed-loop control that maintains battery pack reliability and performance by preventing degraded cells from negatively impacting the overall system
2Duration of action of moving object
If degraded battery cells are used, then the battery pack can continue operating, but damage can occur to the battery pack
Solution Approach 1:
The system performs preliminary impedance measurement and state of health assessment on battery cells before they can cause damage to the battery pack. By detecting degradation early through impedance changes and isolating affected cells proactively, the system extends operational duration while preventing harmful effects from degraded cells
Solution Approach 2:
The system converts the potentially harmful presence of degraded cells into a beneficial diagnostic opportunity. By measuring impedance of individual cells and identifying degradation patterns, the system transforms what would be a harmful condition into useful information that triggers preventive isolation, thereby extending battery pack life without causing damage
3Measurement precision
If complex impedance measurement is used to diagnose individual cells, then state of health can be determined, but system complexity increases
Solution Approach 1:
The impedance measurement system is designed with multi-functionality to reduce overall complexity. The same measurement circuitry and processing logic are used across all battery cell monitors, and the isolation units serve dual purposes of both measurement and cell disconnection. This universal approach achieves precise state of health measurement while minimizing the complexity increase through standardized, reusable components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves battery pack performance and reliability by preventing degraded cells from contributing to the system, thereby extending the life and efficiency of the battery pack.
Implementation Method 1
determining, via a complex impedance measurement unit, a state of health of the first battery cell
Data Source
AI summary
Techniques are provided for battery imbalance diagnosis and mitigation. In one embodiment, the techniques involve isolating, via a first isolation unit, a first battery cell from a plurality of battery cells, determining, via a complex impedance measurement unit, a state of health of the first battery cell, and controlling, via a controller, the first battery cell based on the state of health of the first battery cell.