Battery Module Wireless BMS Control Under Communication Interference
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Solution Overview
Problem
Wireless communication in storage battery apparatuses using radio waves is prone to interference, leading to potential failures and reduced reliability, necessitating a solution to enhance availability and ensure operation even in the presence of interference.
Innovation Solution
A storage battery apparatus with a battery management unit that extends communication cycles with cell monitoring units during interference, adjusts chargeable and dischargeable currents based on state of charge, health, and temperature, and employs channel switching to mitigate interference effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If wireless communication using radio waves is implemented between storage battery modules and management apparatus, then device complexity is reduced and ease of operation is improved, but reliability deteriorates due to interference and communication failures
Solution Approach 1:
The system dynamically changes communication parameters including switching between different radio wave frequencies/channels and adjusting communication cycles based on detected interference levels. When interference is detected, the management apparatus switches to alternative frequencies or extends communication cycles to ensure successful data transmission, thereby maintaining reliability while using wireless communication.
2Reliability
If communication cycle is extended during interference, then reliability is improved by reducing communication failures, but productivity deteriorates due to reduced communication frequency
Solution Approach 1:
The communication cycle is made dynamic rather than fixed. The management apparatus adjusts the communication cycle length based on real-time interference conditions - using shorter cycles when communication is successful and extending cycles when interference is detected. This dynamic adjustment ensures operational reliability while minimizing the impact on communication efficiency and productivity.
Solution Approach 2:
The system employs periodic communication attempts with variable intervals. Instead of continuous communication, the system uses periodic check-ins at adapted intervals, extending the period only when necessary due to interference. This approach maintains system availability while optimizing communication resource usage and preventing excessive communication attempts during poor signal conditions.
3Reliability
If chargeable and dischargeable currents are limited based on communication state, then reliability is improved by ensuring operation during poor communication, but productivity deteriorates due to reduced current values
Solution Approach 1:
The chargeable and dischargeable current limits are made dynamic parameters that adjust based on communication quality. When communication is successful, higher current limits are permitted for optimal productivity. When interference is detected and communication fails, the system automatically reduces current limits to conservative values that ensure safe operation even with delayed communication feedback. This dynamic current adjustment maintains reliability while maximizing productivity under good communication conditions.
Data Source
AI summary
According to one embodiment, a storage battery apparatus includes: a plurality of storage battery modules each including a battery module, which includes a plurality of battery cells, and a cell monitoring unit measuring voltages of the battery cells and a temperature of the battery module; and a battery management unit periodically receiving measurement values of the voltages of the battery cells and the temperature of the battery module. When there is interference in communication with the plurality of cell monitoring units, the battery management unit extends a communication cycle with the cell monitoring units, sets a value of a chargeable current and a value of a dischargeable current of the battery module, which correspond to at least the communication cycle.