Battery Pack BMS Analog Digital Conversion for Cell Count
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Solution Overview
Problem
Existing battery management systems (BMS) are limited in controlling a greater number of batteries than they are designed for, leading to increased manufacturing costs and reduced stability.
Innovation Solution
A battery pack design that incorporates an analog digital converting port in the battery management unit, allowing it to control N+1 batteries by using a voltage measuring terminal for main battery cells and an analog to digital converting terminal for additional battery cells, along with a protection circuit that compares output and reference voltages to detect abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a BMS is designed to control a specific number of batteries, then the manufacturing cost and system complexity are optimized for that number, but the system cannot control a greater number of batteries without increasing cost and complexity
Solution Approach 1:
The BMS is designed with multi-functional terminals that can serve different purposes. The voltage measuring terminal can measure voltages of main battery cells, while the analog-to-digital converting terminal can measure voltages of additional battery cells through a switching element. This universal design allows the same BMS hardware to control more batteries than traditionally designed for, without proportionally increasing system complexity
Solution Approach 2:
The system employs dynamic switching elements that can connect different battery cells to measurement terminals based on operational needs. The switching element dynamically routes voltage signals from either main or additional battery cells to the appropriate measurement terminal, enabling flexible control of variable battery configurations without requiring dedicated measurement circuits for each cell
2Adaptability or versatility
If a BMS is designed to control a specific number of batteries, then the manufacturing cost is optimized, but controlling more batteries increases manufacturing cost
Solution Approach 1:
The BMS uses universal measurement terminals that can measure voltages of both main and additional battery cells. The analog-to-digital converting terminal serves dual purposes by measuring voltages through the switching element, eliminating the need for separate dedicated measurement circuits for additional cells, thereby reducing manufacturing costs while increasing adaptability
Solution Approach 2:
The system uses existing BMS components (voltage measuring terminal, analog-to-digital converting terminal, switching element) to serve the additional function of measuring and controlling more battery cells. Rather than adding new dedicated components for each additional cell, the existing infrastructure is made to serve multiple purposes, reducing overall manufacturing cost
3Adaptability or versatility
If voltage measurement is performed for additional battery cells, then control capability is improved, but measurement precision may be affected due to analog-to-digital conversion
Solution Approach 1:
The switching element acts as an intermediary that selectively connects additional battery cells to the analog-to-digital converting terminal. This intermediary mechanism allows voltage measurement of additional cells through existing conversion infrastructure, maintaining measurement precision by using the same high-precision analog-to-digital converter already present in the system rather than introducing new measurement pathways
Data Source
AI summary
A battery pack is disclosed. In one aspect, the battery pack includes a battery unit including a plurality of main battery cells and an additional battery cell. The battery pack also includes a battery management system (BMS) configured to receive voltage information about the battery unit and control charging and discharging of the battery unit. The BMS includes at least one voltage measuring terminal configured to receive main voltage information about the main battery cell and an analog to digital converting terminal configured to receive additional voltage information about the additional battery cell.