Battery OCV-SOC Profile Switching for Capacity Degradation Control
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Solution Overview
Problem
The repeated switching of Open Circuit Voltage (OCV)-State Of Charge (SOC) profiles in batteries due to capacity degradation leads to safety and reliability issues in battery control.
Innovation Solution
An apparatus and method that store multiple OCV-SOC profiles with overlapping zones, measure battery operational characteristics, and control charge/discharge based on the degree of degradation, calculating partial capacity and selecting the appropriate profile to change the OCV-SOC profile accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OCV-SOC profile is changed when battery capacity degrades below a threshold, then the battery control adapts to degradation, but repeated profile switching occurs causing safety and reliability issues
Solution Approach 1:
The patent implements dynamic OCV-SOC profile management by continuously monitoring battery capacity degradation and switching between different profiles (first profile for healthy batteries, second profile for degraded batteries) based on real-time capacity thresholds. This dynamic adaptation ensures the control strategy matches the actual battery state while preventing repeated switching through stable threshold-based decision logic.
Solution Approach 2:
The patent changes the OCV-SOC profile parameters based on battery capacity degradation. When capacity falls below a threshold, the system transitions from a first OCV-SOC profile to a second OCV-SOC profile that is specifically adapted for degraded batteries, ensuring optimal and safe control throughout the battery lifecycle.
2Productivity
If the OCV range is expanded to increase available capacity in degraded batteries, then capacity utilization improves, but the OCV-SOC profile must be frequently switched causing instability
Solution Approach 1:
The patent segments the battery lifecycle into distinct phases with different OCV-SOC profiles: a first profile for batteries with capacity above the threshold and a second profile for degraded batteries. This segmentation allows each profile to be optimized for its specific phase, expanding OCV range when appropriate while maintaining stability through clear phase boundaries.
Solution Approach 2:
The system continuously monitors battery capacity and provides feedback to determine whether to use the first or second OCV-SOC profile. This feedback mechanism ensures the correct profile is selected based on actual battery state, maximizing capacity utilization while preventing unstable repeated switching through reliable threshold-based decision making.
Data Source
AI summary
Disclosed is an apparatus and method for managing an Open Circuit Voltage (OCV)-State Of Charge (SOC) profile of a battery. The apparatus according to the present disclosure includes a storage means to store a plurality of OCV-SOC profiles having an overlapping zone in which the OCV-SOC profiles overlap in a predetermined SOC range; and a control means coupled to the storage means. The control means is configured to calculate a partial capacity of the battery in the SOC range of the overlapping zone during charging or discharging of the battery, determine a reduction ratio of the current partial capacity to the partial capacity of the battery at Beginning Of Life (BOL), select the OCV-SOC profile corresponding to the reduction ratio among the plurality of OCV-SOC profiles, change the current OCV-SOC profile to the selected OCV-SOC profile, and control the charge or discharge of the battery using the changed OCV-SOC profile.