Battery Charging Current Control for Low-Temperature SOC Accuracy
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Solution Overview
Problem
Existing power storage systems face challenges in achieving full charge capacity at low temperatures due to increased internal resistance, leading to incomplete charging and prolonged charge times, as current methods either maintain constant current values or reduce them to prevent overvoltage, resulting in insufficient state of charge or extended charging periods.
Innovation Solution
A power storage apparatus and method that dynamically adjusts the current value based on both temperature and state of charge (SOC) using a current value setting table, varying the current as SOC increases to ensure efficient charging and prevent erroneous charge completion, thereby achieving a state of charge of 90% or more within reduced time frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant current value is used for charging at low temperature, then charging simplicity is maintained, but charging efficiency decreases and charge completion accuracy deteriorates
Solution Approach 1:
The patent implements dynamic current value adjustment during the charging process based on temperature and SOC conditions. The charge controller changes the current value from a first value to a second value (lower than the first) when specific conditions are met, such as when the battery reaches a certain SOC threshold at low temperature. This dynamic adjustment optimizes charging efficiency while preventing overvoltage, resolving the contradiction between charging simplicity and charging efficiency.
2Reliability
If current value is reduced to prevent overvoltage at low temperature, then battery safety is improved, but charge completion accuracy deteriorates and charging time increases
Solution Approach 1:
The patent employs feedback control by continuously monitoring battery temperature and state of charge (SOC) during charging. The charge controller adjusts the current value based on feedback from these measurements, switching between different current values according to predefined thresholds and conditions. This feedback mechanism ensures both battery safety through overvoltage prevention and accurate charge completion detection, resolving the contradiction between safety and measurement precision.
Solution Approach 2:
The patent changes the electrical parameter (current value) based on temperature and SOC conditions. At low temperatures, when the battery reaches a certain SOC threshold, the current value is reduced from a first value to a second value to prevent overvoltage. This parameter change strategy ensures both battery safety and accurate charge completion, addressing the contradiction between reliability and measurement precision.
3Reliability
If current value is reduced to prevent overvoltage at low temperature, then battery safety is improved, but charging time increases
Solution Approach 1:
The patent uses dynamic current adjustment where the charge controller switches between different current values based on real-time temperature and SOC conditions. During the charging process, when the battery reaches a predetermined SOC threshold at low temperature, the current is reduced from a first value to a second value. This dynamic approach maintains battery safety while minimizing charging time by avoiding unnecessary current reduction throughout the entire charging process.
Solution Approach 2:
The patent implements periodic monitoring and adjustment of charging parameters. The charge controller continuously checks temperature and SOC, and periodically adjusts the current value based on the monitored conditions. This periodic action ensures battery safety is maintained while optimizing charging time by applying current reduction only when necessary, rather than maintaining a consistently low current throughout charging.
Data Source
AI summary
A power storage apparatus includes a power storage module, a temperature acquirer, a state-of-charge calculator, and a charge controller. The power storage module includes a plurality of batteries connected to each other. The temperature acquirer acquires a temperature of the power storage module. The state-of-charge calculator calculates a state of charge of the power storage module. The charge controller charges the power storage module with a current value that is set based on the acquired temperature and the calculated state of charge.