Gateway PCBA for Li-Ion Battery SoC Monitoring
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Solution Overview
Problem
Traditional battery management systems struggle to effectively communicate with lead acid battery packs, especially in industrial and commercial vehicle applications, due to their lack of electronic communication capabilities, leading to inaccurate state of charge estimation and inability to detect faulty packs, which can result in inefficient energy use and reduced battery lifespan.
Innovation Solution
A battery management system that enables smart lithium-ion battery packs to notify application devices of limp home mode conditions through analog signals, using a gateway PCBA to interface with lead acid battery systems, and includes internal BMS for state of charge calculation and communication over CAN protocols, allowing for coordinated charging and discharging of battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional application devices monitor pack voltage to determine state of charge, then the device can operate without electronic communication capabilities, but the state of charge estimation becomes inaccurate and faulty packs cannot be detected
Solution Approach 1:
The patent introduces a gateway PCBA as an intermediary device that bridges the communication gap between traditional lead acid battery systems and modern lithium-ion battery management systems. The gateway PCBA includes a CAN transceiver that enables Controller Area Network communication, allowing application devices to accurately read SoC and fault status from lithium-ion battery packs without requiring the application device itself to have native CAN communication capabilities. This resolves the contradiction by providing accurate measurement through an intermediary that handles the complex communication protocol.
Solution Approach 2:
The patent changes the communication parameter from simple analog voltage monitoring to digital CAN protocol communication. By implementing a gateway PCBA with CAN transceiver functionality, the system transforms the interaction mode between application devices and battery management systems, enabling precise digital exchange of SoC and fault information while maintaining compatibility with traditional application devices through the gateway interface.
2Productivity
If lithium-ion battery packs implement complex BMS algorithms for accurate state of charge calculation, then energy management efficiency improves, but the system complexity and cost increase
Solution Approach 1:
The patent segments the battery management functionality into modular components: individual battery packs contain their own BMS with CAN communication capability, and a gateway PCBA handles the interface to application devices. This segmentation allows each component to perform specialized functions efficiently, with the BMS focusing on accurate SoC calculation through complex algorithms and the gateway handling communication protocol translation, thereby improving energy management efficiency while organizing complexity into manageable modules.
3Reliability
If traditional lead acid battery systems are used in industrial and commercial vehicle applications, then compatibility with existing application devices is maintained, but accurate state of charge monitoring and fault detection are not achieved
Solution Approach 1:
The gateway PCBA serves as an intermediary that enables lithium-ion battery packs to interface with traditional application devices designed for lead acid batteries. The gateway translates CAN protocol communications from the lithium-ion BMS into forms that traditional application devices can understand, maintaining backward compatibility while enabling advanced fault detection and accurate SoC monitoring capabilities of lithium-ion technology in industrial and commercial vehicle applications.
Data Source
AI summary
A battery system with a large-format Li-ion battery pack powers attached equipment by discharging battery cells distributed among a plurality of battery packs. A limp home notification is generated from a smart lithium-ion battery pack to one or more application devices using an analog signal. The battery pack may provide broadcast messages over electronic communication lines, that includes state of charge (SoC), fault status, etc. which can be read by one or more application devices to enter limp home mode. In another example, a “fully charged” notification is generated from the smart lithium-ion battery pack to one or more application devices using an analog signal. The end device powered by the battery pack system receives and reacts to the outputted fully charged signal by modifying the state of the circuitry on the end device.