Battery SOH Estimation via Voltage Variation Mapping
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Solution Overview
Problem
Conventional methods for calculating the capacity of electronic device batteries are inaccurate when the battery is not fully charged or discharged, leading to potential safety issues such as battery swelling.
Innovation Solution
An electronic device with a memory storing mapping parameters correlating battery voltage variation to state of health (SOH) and a processor that detects external charging, determines mapping parameters based on charging current, and identifies voltage variations to accurately calculate the battery's SOH during partial charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional capacity calculation methods (adding up current during full charge/discharge) are used, then the calculation process is simple, but the accuracy of battery capacity calculation deteriorates when the battery is not fully charged or discharged
Solution Approach 1:
The patent changes the measurement parameter from current integration to voltage variation measurement. By measuring the variation in battery voltage during charging and comparing it to pre-stored mapping parameters, the system achieves accurate SOH calculation without requiring full charge/discharge cycles, thus improving accuracy while maintaining operational simplicity
Solution Approach 2:
The patent creates a reference model by pre-storing mapping parameters that represent the relationship between voltage variation and SOH under various charging conditions. During operation, the system copies this pre-established relationship to determine current battery state, avoiding the need for complex real-time calculations while maintaining high accuracy
2Loss of time
If the battery is charged partially (not from fully discharged state), then the charging time is reduced, but the accuracy of capacity calculation using conventional methods deteriorates
Solution Approach 1:
The patent changes the measurement approach to voltage variation monitoring during the actual charging process. This allows accurate SOH determination at any charging stage without requiring the battery to be fully discharged first, enabling partial charging while maintaining calculation accuracy
Solution Approach 2:
The patent performs preliminary work by pre-storing mapping parameters that correlate voltage variations with SOH values under different charging conditions. This pre-prepared reference data enables accurate SOH calculation during partial charging operations without requiring full charge/discharge cycles
3Measurement precision
If mapping parameters are determined based on charging current, then the accuracy of SOH determination is improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent uses charging current as a parameter to select appropriate mapping parameters from pre-stored data, rather than performing complex real-time analysis. This approach improves SOH determination accuracy by accounting for current-dependent voltage characteristics while keeping processor requirements manageable through lookup-based operations
Data Source
AI summary
An electronic device according to various embodiments of the present invention includes: a memory which stores one or more mapping parameters that indicate the correlation between a voltage change amount and the state of health (SOH) of the battery; and a processor, wherein the processor can be set to: detect that an external device for charging the battery is connected to the electronic device; charge the battery by using a charging current supplied from the external device; decide on at least one mapping parameter among the one or more mapping parameters on the basis of at least the charging current; check the voltage change amount of the battery while the battery is being charged; and acquire the SOH of the battery at least partially on the basis of the at least one mapping parameter and the voltage change amount.