Rechargeable Battery Charging Control via Temperature-Based Current Termination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rechargeable batteries in mobile information handling systems face stress due to high temperature exposure, leading to reduced longevity and increased wear, as well as potential battery swelling from gas generation during charging, which can damage the battery and surrounding components.
Innovation Solution
Implementing a method to configure charge termination current based on temperature values, using a lookup table to determine appropriate charge termination current values for different temperature ranges, and ceasing the electrical charge current when it reaches a predetermined threshold, thereby reducing battery stress and preventing excessive charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high charge current is applied to rechargeable battery, then charging speed is improved, but battery temperature increases causing stress and reduced longevity
Solution Approach 1:
The charging system dynamically adjusts the charge current based on real-time temperature monitoring. The charge controller modifies charging parameters in response to temperature changes, transitioning from static to dynamic control to prevent thermal stress while maintaining efficient charging
Solution Approach 2:
The system implements temperature feedback control where temperature sensors continuously monitor battery temperature and feed this information back to the charge controller. This closed-loop feedback mechanism enables the system to adjust charging current based on actual thermal conditions, preventing overheating while optimizing charge speed
2Duration of action of moving object
If extended charging time is allowed, then battery capacity is fully restored, but gas generation increases causing battery swelling
Solution Approach 1:
The system establishes predetermined charge termination thresholds based on temperature and charging characteristics before the charging process begins. These pre-set limits prevent excessive charging that would lead to gas generation and swelling, stopping the charging process proactively before harmful effects occur
Solution Approach 2:
The system changes charging parameters (current, voltage, time limits) based on temperature conditions and battery state. By dynamically adjusting these parameters, the system optimizes charging efficiency while preventing the conditions that lead to gas generation and battery swelling
3Reliability
If temperature-based charge termination is implemented, then battery stress is reduced, but charging time increases
Solution Approach 1:
The system applies partial charging action by terminating charge at predetermined temperature-based thresholds rather than completing full charge cycles. This partial action approach prevents excessive charging that causes stress and swelling, accepting that not every battery will reach 100% capacity in exchange for reduced thermal stress and swelling prevention
4Productivity
If complex voltage programming is used to optimize charging, then charging efficiency is improved, but device complexity increases
Solution Approach 1:
The battery management system performs self-service by autonomously monitoring temperature and automatically adjusting charging parameters without requiring complex external voltage programming. The system uses built-in temperature sensors and control logic to optimize charging, eliminating the need for sophisticated programmable voltage sources
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach extends rechargeable battery longevity, reduces wear, minimizes gas generation and subsequent swelling, and allows for a simpler charger design by eliminating the need for programmable voltage, while maintaining efficient charging times.
Implementation Method 1
determining the temperature value associated with the rechargeable cell may include receiving the temperature value from a temperature sensor
Data Source
AI summary
In one or more embodiments, one or more systems, one or more methods, and/or one or more processes: may determine that a rechargeable cell of multiple rechargeable cells has reached a top of charge voltage value; in response to determining that the rechargeable cell has reached the top of charge voltage value, may provide an electrical charge current, associated with a charge current value, to the rechargeable cell; may determine a temperature value associated with the rechargeable cell; may determine a charge current termination value based at least on the temperature value; while the charge current value is not at and is not below the charge current termination value: may determine the temperature value associated with the rechargeable cell; and may determine the charge current termination value based at least on the temperature value; and may cease providing the electrical charge current to the rechargeable cell.