Dynamic Battery Charge Voltage Adjustment for Temperature and Aging
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Solution Overview
Problem
Conventional battery charging techniques using constant charge voltage lead to overcharging, reducing battery life, especially in Lithium Ion batteries, due to temperature fluctuations and aging, which degrade capacity and increase internal resistance.
Innovation Solution
A battery charging system that dynamically determines charge voltage based on ambient temperature, state of charge, and age of the battery, using a lookup table to adjust the charge voltage to prevent overcharging and account for battery degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If constant charge voltage is used, then charging simplicity is maintained, but battery life is reduced due to overcharging
Solution Approach 1:
The patent implements dynamic charge voltage adjustment based on ambient temperature and battery state of charge. The charge voltage is no longer constant but varies according to temperature conditions and charging stage, resolving the contradiction by making the charging system adaptive rather than static.
Solution Approach 2:
The patent changes the charge voltage parameter based on temperature and state of charge conditions. By adjusting the voltage parameter dynamically according to environmental and battery conditions, the system prevents overcharging while maintaining charging effectiveness, thus extending battery life without significantly complicating the charging process.
2Device complexity
If constant charge voltage is used, then charging control is simple, but temperature fluctuations cause overcharging
Solution Approach 1:
The patent incorporates feedback mechanisms by continuously monitoring ambient temperature and battery state of charge, then adjusting the charge voltage accordingly. This feedback loop ensures accurate charging control that compensates for temperature fluctuations, preventing overcharging while maintaining reasonable system complexity through the use of lookup tables and standardized adjustment protocols.
3Ease of operation
If charge voltage does not account for temperature, then charging is straightforward, but battery capacity degrades
Solution Approach 1:
The patent adjusts the charge voltage parameter based on temperature and state of charge conditions. By dynamically changing the voltage parameter, the system optimizes charging for different temperature conditions, preventing capacity degradation while maintaining a relatively straightforward charging process through automated control.
Solution Approach 2:
The patent uses pre-established lookup tables that contain optimal charge voltage values for different temperature and state of charge conditions. This preliminary preparation of charging parameters allows the system to quickly determine appropriate voltage settings without complex real-time calculations, maintaining ease of operation while protecting battery capacity.
4Device complexity
If constant charge voltage is applied to aging batteries, then charging procedure remains unchanged, but overcharging occurs more frequently
Solution Approach 1:
The patent implements dynamic charge voltage adjustment that adapts to battery aging conditions. By making the charging voltage dynamic rather than constant, the system can compensate for age-related changes in battery characteristics, improving charging precision without requiring complex manual intervention or procedure changes.
Solution Approach 2:
The patent incorporates feedback based on battery state of charge and temperature to adjust charging parameters. This feedback mechanism allows the system to automatically adapt to aging batteries, improving charging precision while maintaining simple automated control procedures that do not require user intervention.
Data Source
AI summary
According to an example, a battery is charged using a charge voltage based on a present state of charge of the battery and a present ambient temperature of the battery. Additionally, the charge voltage may be based on the present state of charge of the battery, the present ambient temperature of the battery, and an age of the battery. The charge voltage may be retrieved from a lookup table that includes a plurality of reference charge voltage values at which to charge the battery for different ambient temperatures, different states of charge, or different ages of the battery.