Secondary Battery Management System for Multi-Pack Parallel Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Increasing the number of serial unit battery cells in electric vehicles to enhance energy capacity leads to weight and volume issues in wiring harnesses, increased costs due to high-voltage elements, and potential system malfunctions, including fire risks, in existing battery management systems.
Innovation Solution
A secondary battery management system that includes a voltage temperature management system (VTMS) connected to each battery module, which senses and balances cell voltages and temperatures, generates diagnostic information, and communicates with a sub BMS, allowing for grouping of battery packs and reducing the need for high-voltage elements by using a communication signal line and power line, thereby minimizing wiring and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of serial unit battery cells is increased to enhance energy capacity, then energy capacity is improved, but weight and volume of wiring harness increase
Solution Approach 1:
The patent divides the battery system into multiple battery packs, each with its own integrated management system. Instead of one centralized BMS managing all cells through extensive wiring, each battery pack (containing multiple serial cells) has its own management capabilities, segmenting the monitoring functions and reducing the need for long-distance wiring harnesses connecting individual cells to a central controller.
2Use of energy by moving object
If the number of serial unit battery cells is increased to enhance energy capacity, then energy capacity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions (voltage sensing, temperature monitoring, cell balancing, and management control) into an integrated management system for each battery pack. This merging of functions reduces the number of separate components and simplifies the overall system architecture, making it easier to manage high-voltage, multi-cell configurations without proportionally increasing complexity.
3Reliability
If high-voltage elements are used for cell voltage of 100 cells or more, then system operation is enabled, but costs are greatly increased
Solution Approach 1:
The patent introduces an intermediary management system between the high-voltage battery cells and the low-voltage control systems. This intermediate management layer handles high-voltage sensing and control functions locally at each battery pack, then communicates with the main vehicle controller through standard low-voltage communication protocols. This intermediary approach enables high-voltage system operation while avoiding the need to upgrade entire vehicle control systems to handle high voltages, thereby controlling costs.
4Measurement precision
If wiring harness for sensing voltage is increased to accommodate more battery cells, then measurement coverage is improved, but reliability decreases due to vulnerable structure
Solution Approach 1:
The patent segments the voltage sensing function so that each battery pack has its own integrated management system that locally monitors cell voltages. This eliminates the need for long-distance wiring harnesses to connect individual cell sensors to a remote central controller. The segmented architecture improves reliability by reducing wiring length and potential failure points while maintaining comprehensive voltage monitoring coverage across all battery cells.
Data Source
AI summary
Provided is a secondary battery management system and method for exchanging information in a multi-pack parallel structure using the same, and more particularly, to a secondary battery management system and method for exchanging information in a multi-pack parallel structure using the same, including:a unit battery cell;a battery module in which a plurality of unit battery cells are disposed; and a voltage temperature management system (VTMS) generates a state information and generates a diagnosis information of battery module or the unit battery cells using unit battery cell information for the unit battery cells.