Battery Degradation Estimation During BMS Sleep States
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Solution Overview
Problem
Existing battery management systems fail to provide degradation information when the monitoring unit is not operating, leading to user unawareness of battery condition during non-operating states.
Innovation Solution
A battery management system that includes an obtaining unit to collect electrical data during operation and environmental data during non-operation, an estimating unit to calculate degradation based on these data, and a display to show the degradation state, using cloud computing and wireless communication to facilitate continuous monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the monitoring unit operates continuously to monitor battery state, then measurement precision of battery degradation is improved, but use of energy increases and device complexity increases
Solution Approach 1:
The monitoring unit operates periodically rather than continuously. The controller switches the monitoring unit between operating state and non-operating state, performing battery state measurements at specific intervals (when switching occurs) rather than maintaining constant monitoring, thereby reducing energy consumption while still capturing degradation information.
Solution Approach 2:
The system uses the battery's own operational characteristics (voltage changes during charging/discharging) to perform degradation measurements. The controller calculates degradation based on voltage measurements taken during natural state transitions, utilizing the battery's self-service during normal operation rather than requiring dedicated continuous monitoring power.
2Loss of information
If the monitoring unit operates continuously to provide real-time degradation information, then information availability is improved, but use of energy increases
Solution Approach 1:
Degradation information is provided periodically at state transition points rather than continuously. The controller determines degradation degree when the monitoring unit switches between operating and non-operating states, ensuring information availability at critical moments while avoiding continuous energy consumption.
Solution Approach 2:
The system performs degradation calculations in advance at state transition points, preparing degradation information before it is needed for display or decision-making. This preliminary calculation approach ensures information is ready when switching occurs without requiring continuous computation and energy expenditure.
3Use of energy by moving object
If the monitoring unit is in non-operating state to save energy, then use of energy is reduced, but measurement precision of battery degradation deteriorates
Solution Approach 1:
The system strategically schedules measurements to occur at periodic state transition moments. By switching the monitoring unit between operating and non-operating states and performing measurements at these transition points, the system captures sufficient degradation information without maintaining continuous operation, thus balancing energy savings with measurement adequacy.
Solution Approach 2:
The controller uses feedback from voltage measurements taken during state transitions to calculate degradation degree. The system monitors voltage changes during charging/discharging phases and uses this feedback information to determine degradation, ensuring accurate measurements are obtained even with intermittent monitoring operation.
Data Source
AI summary
A battery management system includes an obtaining unit, an estimating unit, and a display. The obtaining unit obtains electrical data of a battery in an operating state of a monitoring unit that monitors the battery, and environmental data in a non-operating state. The electrical data includes a first SOC of the battery before transition from the operating state to the non-operating state and a second SOC of the battery after transition from the non-operating state to the operating state. The environmental data includes an outside temperature. The estimating unit estimates a charge/discharge state in the non-operating state based on the first SOC and the second SOC, estimates a temperature of the battery in the non-operating state based on the outside temperature, and estimates the degradation degree of the battery in the non-operating state based on the estimated charge and discharge state and the estimated temperature of the battery.