Wireless Battery BMS Timing for Road-Aware Safety Mode Entry
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Solution Overview
Problem
Wireless battery management systems experience increased communication failures and frequent entry into safety mode, leading to reduced stability and marketability due to unreliable communication failure diagnosis.
Innovation Solution
A battery management method that determines wireless communication failures by considering road conditions, setting different failure confirmation times based on whether the vehicle is on roads capable of causing cell overvoltage/low voltage, and entering safety mode only after these times have elapsed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master BMS enters safety mode immediately upon detecting wireless communication failure, then battery safety is protected, but system stability deteriorates due to frequent unnecessary relay opening
Solution Approach 1:
The system performs preliminary actions by setting different failure confirmation times based on road conditions before entering safety mode. On roads capable of causing cell overvoltage/low voltage, a first (shorter) failure confirmation time is set, while on other roads, a second (longer) failure confirmation time is set. This preliminary differentiation prevents unnecessary safety mode entries while maintaining battery safety.
Solution Approach 2:
The failure confirmation time is made dynamic rather than fixed. The system adjusts the confirmation time based on real-time road condition information, making the safety response adaptive to operating conditions. This dynamic adjustment reduces unnecessary relay opening while maintaining protective functionality when needed.
2Ease of operation
If the master BMS uses a fixed failure confirmation time, then the system is simple to operate, but it cannot reliably distinguish between temporary communication glitches and actual failures
Solution Approach 1:
The system changes the parameter of failure confirmation time based on road condition parameters. By receiving road condition information and adjusting the confirmation time accordingly, the system achieves more accurate communication failure diagnosis without requiring complex diagnostic algorithms, maintaining ease of operation while improving precision.
3Reliability
If the master BMS enters safety mode frequently to ensure battery protection, then battery safety is maintained, but marketability decreases due to reduced system stability
Solution Approach 1:
The system performs preliminary assessment of road conditions before entering safety mode. By pre-setting appropriate failure confirmation times based on whether the vehicle is on roads capable of causing cell overvoltage/low voltage, the system avoids unnecessary safety mode entries that would harm marketability while maintaining battery protection when truly needed.
Data Source
AI summary
A management method of a battery system includes determining whether a wireless communication failure occurs between a master battery management system (BMS) and at least one of a plurality of slave battery management systems (BMSs); receiving road condition information of where the vehicle equipped with the battery system is currently positioned if the wireless communication failure occurs; determining whether the vehicle is on the road based on the road condition information; setting a first failure confirmation time if the current position of the vehicle is on the road; setting a second failure confirmation time if the current position of the vehicle is not located on the road; and entering a safety mode if a wireless communication failure section from the time when the wireless communication failure occurs to the current time reaches the first failure confirmation time or the second failure confirmation time.