Battery Pack Status Estimation Using Cell Threshold Evaluation

The patent applies dynamics by making the battery pack status reporting adaptive rather than static. The system dynamically selects between different reporting modes (average-based vs. maximum-based) depending on the operational context and battery conditions. This allows the system to switch between smoothed average values during normal operation and maximum values when safety limits are approached, resolving the contradiction between reliability and simplicity by introducing conditional adaptability.

The patent changes the parameter used for reporting based on the battery's operational state. When the average temperature or SOC is close to maximum limits, the system transitions from reporting average values to reporting maximum values. This parameter change strategy allows the system to maintain reliability by reporting the most critical value (maximum) when it matters most, while avoiding unnecessary alarm during normal operation when average values suffice.

The system dynamically adjusts the reporting strategy based on the relationship between average and maximum values. During normal operation when the spread between average and maximum is small, the system reports average values for ease of interpretation. When the spread increases and maximum values approach safety limits, the system transitions to reporting maximum values to ensure safety accuracy. This dynamic adaptation resolves the contradiction by contextually selecting the most appropriate reporting mode.

The patent introduces an intermediary evaluation layer that processes both average and maximum temperature/SOC values before presenting information to the user. This intermediary layer compares the spread between average and maximum values and determines which value to report based on safety considerations. The intermediary acts as a mediator that balances user interpretability with safety accuracy, selecting the most appropriate value to report in each context.

The patent merges individual cell-level measurements into a unified battery pack status report. By collecting temperature and SOC readings from all cells and evaluating them collectively, the system determines the overall battery pack status. The merging process involves comparing individual cell values against the average and determining whether the maximum or average should represent the pack status, thus combining detailed cell information into a reliable pack-level assessment.

The patent applies local quality by treating different cells differently based on their individual characteristics and their impact on overall pack status. Rather than uniformly averaging all cell readings, the system identifies cells with extreme values (maximum temperature or SOC) and gives them special consideration. This local quality approach ensures that cells which are limiting the pack performance are properly represented in the overall status report, maintaining both cell-level precision and pack-level reliability.