Internal Cell Supervision Circuit for Battery System Wiring Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery systems require additional wiring harnesses for cell supervision, increasing manufacturing costs and complexity.
Innovation Solution
Integration of internal cell supervision circuits (iCSCs) within each battery cell, allowing communication with the battery management system (BMS) via power lines, eliminating the need for separate wiring harnesses and enabling internal balancing of state of charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cell supervision circuits (CSCs) are used with wiring harnesses for communication, then cell monitoring capability is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the cell supervision circuit functionality directly into the battery management system integrated circuit. Instead of having separate CSC units connected via wiring harnesses, the monitoring functions are merged into the BMS IC that can communicate with all battery cells through the existing power line infrastructure, thereby eliminating the need for additional wiring harnesses while maintaining comprehensive cell monitoring capability
Solution Approach 2:
The BMS integrated circuit is designed to perform multiple functions: it serves as both the battery management system and the cell supervision circuit for all battery cells. The single BMS IC can communicate with and monitor multiple battery cells through the power lines, replacing the need for dedicated supervision circuits for each cell group
2Measurement precision
If additional wiring harnesses are installed for CSC connections, then cell voltage and temperature measurement is enabled, but manufacturing cost increases
Solution Approach 1:
The measurement functions for cell voltage and temperature are merged into the BMS IC's capabilities. The system uses the existing power line communication infrastructure to transmit measurement data from all battery cells to the single BMS IC, eliminating the need for separate wiring harnesses and reducing manufacturing costs while maintaining precise measurement capabilities
Solution Approach 2:
The system utilizes the existing power lines that are already part of the battery system architecture to serve the dual purpose of power delivery and data communication. By making the power lines serve themselves for both functions, the system eliminates the need for additional dedicated measurement wiring, thereby reducing manufacturing complexity and cost
3Reliability
If separate CSCs are used for each battery module, then cell supervision is achieved, but the system requires additional components and assembly steps
Solution Approach 1:
The patent extracts the cell supervision functionality from separate physical CSC units and integrates it directly into the BMS IC. This extraction consolidates multiple discrete components (separate CSCs for different battery modules) into a single integrated circuit that can perform supervision functions for all cells, thereby reducing the total number of components and assembly steps
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention refers to a battery system (100) which comprises a plurality of battery cells (10), each battery cell (10) comprising two cell terminals (11, 12) electrically connected to one of two system terminals (98, 99) via one of two power lines (51, 52), respectively. At least some of the battery cells (10) further comprise an internal cell supervision circuit, iCSC (70), arranged within said battery cells (10) respectively, wherein each of the iCSCs (70) is adapted to detect at least one parameter of the battery cell (10) it is arranged in. The battery system (100) further comprises a battery management system, BMS (90), adapted to communicate bidirectionally with the iCSCs (70) via the power lines (98, 99). The iCSCs (70) are further adapted to perform a balancing of the state of charge, SOC, of the battery cells (10) the iCSCs (70) are arranged in respectively.