Wireless Battery Management Channel Selection Under Pack Shielding
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Solution Overview
Problem
Existing wireless battery management systems (WBMS) face challenges in effectively mitigating interference from external sources due to the shielding effect of the battery pack enclosure, leading to unpredictable channel performance and increased packet error rates, especially in environments with varying interference patterns.
Innovation Solution
Incorporating a remote antenna located outside or within the battery pack enclosure to detect interference earlier and proactively select or reserve wireless channels using various strategies, including channel reservation messages, to minimize interference impact on communication between the master and slave controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master antenna is used inside the battery pack enclosure for wireless communication, then the communication is protected from external interference, but the detection of external interference is delayed
Solution Approach 1:
A remote antenna acts as an intermediary element positioned outside the battery pack enclosure. This remote antenna detects external interference signals before they reach the master antenna inside the enclosure, providing early warning without compromising the shielded communication environment. The remote antenna serves as a sentinel that mediates between the external interference sources and the internal communication system.
Solution Approach 2:
The remote antenna performs preliminary interference detection outside the battery pack enclosure before interference affects the internal communication. By detecting interference signals in advance and notifying the master controller, the system can proactively switch channels or adjust communication parameters before packet errors occur, maintaining communication reliability while enabling early interference detection.
2Object-affected harmful factors
If the battery pack enclosure provides shielding to protect internal components, then protection from external interference is improved, but detection of external interference is hindered
Solution Approach 1:
The remote antenna positioned outside the battery pack enclosure serves as an intermediary detection element. It can sense external interference signals in the environment without being blocked by the enclosure shielding, and relay this information to the master controller. This resolves the contradiction by separating the detection function (performed by remote antenna outside shielding) from the communication function (protected inside shielding).
Solution Approach 2:
The system adds a spatial dimension to interference detection by placing a remote antenna outside the battery pack enclosure, while the master antenna remains inside for protected communication. This multi-dimensional approach allows simultaneous achievement of shielding protection and external interference detection by operating in different spatial locations.
3Reliability
If channel switching is performed reactively after interference is detected, then communication reliability is maintained, but packet error rates increase during transition
Solution Approach 1:
The remote antenna enables preliminary detection of external interference before it degrades communication quality. The master controller receives early interference notifications and proactively switches to alternative channels before packet errors occur. This preliminary channel switching action prevents information loss during interference events, maintaining communication reliability without increasing error rates.
Solution Approach 2:
The system implements a feedback mechanism where the remote antenna continuously monitors external interference and provides real-time information to the master controller. Based on this feedback, the master controller dynamically adjusts communication parameters or switches channels proactively, creating a closed-loop system that maintains reliability by responding to interference conditions before they cause packet errors.
Data Source
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AI summary
A battery management system, comprising: a battery pack enclosure that contains: a master controller and a plurality of slave controllers. Each of the plurality of slave controllers is configured to communicate wirelessly with the master controller using their respective antennas over one of a plurality of wireless channels. The battery management system further comprises: a remote antenna, which is located remote from the master antenna such that it is less shielded by the battery pack enclosure to interference that is external to the battery pack enclosure; and a controller that is configured to: receive signalling from the remote antenna and process the signalling to determine a level of interference in the plurality of wireless channels; and based on the determined level of interference in the plurality of wireless channels, select one of the plurality of wireless channels for wireless communication between the master controller and the plurality of slave controllers.