Distributed Battery Cell-Group Monitoring for Charge Balancing
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Solution Overview
Problem
Existing lithium-ion battery management systems rely on centralized models and controllers, which can lead to inefficiencies and challenges in managing the state of charge, state of health, and charge balancing across multiple cells, especially in large battery packs.
Innovation Solution
The proposed energy conversion arrangement features a distributed system where each cell group is equipped with its own measurement and processing circuitry, allowing for local determination of conditions such as state of charge and state of health, and enabling independent or cooperative charge balancing without a central controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a centralized model and controller are used to manage battery cells, then the system structure is simplified, but the efficiency of managing state of charge, state of health, and charge balancing deteriorates
Solution Approach 1:
The patent divides the battery management system into multiple independent cell groups, where each cell group has its own processing circuitry that independently determines state of charge, state of health, and performs charge balancing. This segmentation allows parallel processing of multiple cell groups simultaneously, improving management efficiency while maintaining manageable system complexity through modular architecture.
2Measurement precision
If measurements are made at each cell group with local processing, then the management precision and response time improve, but the device complexity increases
Solution Approach 1:
The patent implements local processing circuitry at each cell group that performs measurements and determinations independently. Each cell group's processing unit is tailored to handle its specific cells' characteristics, enabling precise local condition determination. This local quality approach improves measurement precision and response time while the modular design keeps overall system complexity manageable.
3Reliability
If a distributed system with independent cell group processing is used, then the charge balancing and safety monitoring improve, but the manufacturing complexity increases
Solution Approach 1:
The patent structures the battery system as multiple identical or similar cell groups, each with standardized processing circuitry. This segmentation into uniform modules simplifies manufacturing through repetition of proven designs, while still achieving improved safety and charge balancing through distributed independent operation of each module.
Data Source
AI summary
An energy conversion arrangement configured to convert chemical energy into electrical energy. The energy conversion arrangement comprises plural cell groups 30, 32, 34, 36, each cell group being configured to convert chemical energy into electrical energy. The energy conversion arrangement also comprises at least one measurement arrangement 38, 40, 42, 44, 46 configured to make measurements at each of the plural cell groups 30, 32, 34, 36. Each energy conversion arrangement is configured to determine a condition of at least one of: each of the plural cell groups; and the energy conversion arrangement. The condition is determined in dependence on the measurements made at each cell group and a model of each cell group.