Battery SoC Balancing Before Shutdown to Reduce Ignition Risk
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Solution Overview
Problem
Battery control systems fail to prevent ignition in battery-mounted devices, such as vehicles, when the device is turned off, especially when the battery state-of-charge is high, due to external or internal factors like collisions or short-circuits.
Innovation Solution
A battery control system that detects the operation state of external devices, identifies the remaining state of charge of each battery, and performs cell balancing up to a designated level for batteries exceeding a threshold value to reduce the risk of ignition by lowering energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay is turned off when the device is turned off to prevent arbitrary battery use, then battery security is improved, but the risk of ignition increases when battery SoC is high due to external or internal factors
Solution Approach 1:
The system performs cell balancing before the device is turned off to reduce battery SoC to a safe level. By proactively managing battery charge levels in advance, the system eliminates the harmful effect of high SoC that would otherwise create ignition risk during the off state, while still maintaining the security benefit of turning off the relay.
Solution Approach 2:
The system changes the battery state parameters by performing cell balancing to reduce SoC from a high state to a safe level before device shutdown. This parameter change ensures that even when the relay is turned off for security purposes, the reduced energy content minimizes ignition risk from external or internal factors.
2Stability of the object's composition
If cell balancing is performed for all batteries regardless of SoC level, then battery uniformity is improved, but energy waste increases due to unnecessary balancing operations
Solution Approach 1:
The system applies cell balancing selectively only to batteries that exceed the threshold SoC level, rather than uniformly to all batteries. This localized approach ensures that balancing energy is consumed only where needed (in batteries with high SoC), while batteries already at safe levels require no additional energy input, thus eliminating unnecessary energy waste.
Solution Approach 2:
The system performs partial cell balancing only on the subset of batteries that require it (those exceeding threshold SoC), rather than applying full balancing to all batteries. This partial action approach reduces energy consumption by avoiding excessive balancing operations on batteries that are already at safe charge levels.
3Object-affected harmful factors
If the system monitors and manages battery SoC levels continuously, then ignition risk is reduced, but system complexity increases
Solution Approach 1:
The system performs cell balancing as a preliminary action before device shutdown is detected, rather than continuously monitoring and managing SoC throughout operation. By triggering balancing only when shutdown is anticipated and only when threshold SoC is exceeded, the system reduces ignition risk without requiring complex continuous monitoring and control mechanisms during active operation.
Data Source
AI summary
Provided is an operating method of a battery control system including a plurality of batteries, the operating method including detecting, by a processor, an operation of an external device is off, identifying, by the processor, a remaining state of charge (SoC) of each of the plurality of batteries, and performing, by the processor, a cell balancing up to a designated level for at least one of the plurality of batteries having a remaining SoC exceeding a threshold value.