Cell Information Storage for Battery Pack Balancing
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Solution Overview
Problem
In electric vehicle battery packs, maintaining equal State of Charge (SoC) across series-connected battery cells is challenging due to leakage current and efficiency differences, leading to mismatches that grow with each charge/discharge cycle, necessitating cell-balancing circuits to prevent premature degradation and economic replacement of entire packs.
Innovation Solution
Each energy storage cell is equipped with a local cell information storage device, such as an integrated circuit, to store and communicate vital parameters like cell voltage, temperature, SoC, SoH, and SoF, using existing communication interfaces, allowing for localized maintenance and balancing without replacing the entire pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell-balancing circuits are added to equalize cell charges, then the State of Charge uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent divides the battery pack into modular sections, with each section containing multiple cells that share common balancing components. This segmentation allows the balancing circuit to be scaled and configured flexibly, reducing overall complexity compared to individual balancing circuits for each cell.
Solution Approach 2:
The balancing components (resistors, switches, control logic) are designed to serve multiple cells within a section simultaneously. A single balancing circuit can balance multiple cells by switching between them, reducing the total number of components needed compared to dedicated per-cell balancing circuits.
2Reliability
If complete battery pack replacement is performed when cells degrade, then the reliability is maintained, but the loss of substance and cost increase
Solution Approach 1:
The patent enables individual cell replacement by providing each cell with unique identification and characterization data stored locally. This segmentation of information allows the control system to identify and replace only degraded cells rather than the entire pack, reducing material waste.
Solution Approach 2:
The system facilitates selective replacement of failed cells while retaining and reusing healthy cells in the pack. The local storage of cell data enables proper tracking and management of replaced cells, allowing for recovery and recycling of valuable materials from only the necessary components.
3Ease of repair
If cell information is stored locally in each cell, then the ease of repair is improved, but the device complexity increases
Solution Approach 1:
Each cell contains local storage of its own identification, characterization, and status data. This self-service approach enables the cell to provide its own diagnostic information without requiring external measurement equipment, simplifying repair and replacement procedures.
Solution Approach 2:
The patent combines the information storage function with the cell itself, integrating the memory device directly into or with each cell. This merging eliminates the need for separate external storage systems and enables straightforward identification and tracking of individual cells during maintenance.
Data Source
AI summary
An energy storage cell for a multi-cell energy storage device is disclosed. The energy storage cell comprises a cell information storage device adapted to store cell information regarding the energy storage cell.