Vehicle Battery SOC Range Control for Longer Pack Life
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Solution Overview
Problem
The existing battery management systems for vehicles restrict the use of battery packs other than the most deteriorated one, leading to a limited supply of power, which decreases the battery lifespan and limits driving time and distance.
Innovation Solution
A battery management method that sets a state of charge (SOC) range based on driving information to minimize battery degradation, allowing the battery to operate within a predetermined SOC limiting range of 30-70% to delay the decrease in battery lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If power supply is controlled based on the battery pack with the most deterioration, then battery lifespan is extended, but use of other battery packs is restricted and power supply capability is limited
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the SOC (State of Charge) limiting range based on driving conditions. Instead of using a fixed SOC limit for all battery packs, the system varies the SOC limiting range according to vehicle speed, acceleration, temperature, and other driving parameters. This allows battery packs with different deterioration levels to operate within optimized SOC ranges that extend their lifespan while still meeting the vehicle's power demands under different conditions.
2Duration of action of stationary object
If SOC limiting range is applied to extend battery lifespan, then battery degradation is minimized, but driving time and distance are limited
Solution Approach 1:
The patent implements dynamics by making the SOC limiting range adjustable and condition-dependent rather than fixed. The system continuously monitors driving conditions (vehicle speed, acceleration, temperature, humidity) and dynamically adjusts the SOC limiting range accordingly. During high-demand conditions, the system can temporarily expand the SOC range to ensure sufficient power supply, while under normal conditions it maintains the optimized range for lifespan extension. This dynamic adjustment resolves the contradiction between lifespan extension and driving duration.
3Object-affected harmful factors
If fixed SOC range is used for charging, then battery degradation is reduced, but adaptability to different driving conditions is poor
Solution Approach 1:
The patent applies feedback by continuously monitoring driving conditions and battery state, then adjusting the SOC limiting range in real-time. The system receives feedback from sensors measuring vehicle speed, acceleration, temperature, humidity, and battery voltage/current. Based on this feedback, the control unit dynamically optimizes the SOC limiting range to balance battery protection with driving performance requirements. This closed-loop feedback mechanism enables the system to adapt to different driving conditions while minimizing battery degradation.
Data Source
AI summary
A battery device receives a state of charge (SOC) a SOC setting range, charge at least one battery pack, estimates a SOC based on state information of the at least one battery pack, monitors whether the estimated SOC reaches a charging reference value corresponding to an upper limit of the SOC setting range, and stops charging when it is confirmed through a result of the monitoring that the estimated SOC reaches the charging reference value. The SOC setting range may be determined based on driving information of a vehicle, and may be within a SOC limiting range in which degradation of battery cells included in the at least one battery pack is the lowest.