Internal Temperature Sensor for Fast Battery Charge Control
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Solution Overview
Problem
Conventional surface-mounted temperature sensors fail to accurately track rapid internal temperature changes in lithium-ion battery cells, leading to inadequate detection and prevention of thermal runaway, which can cause damage and safety issues during charging.
Innovation Solution
A battery charging system with an internal temperature sensor that measures and correlates phase delays with internal cell temperatures, allowing for real-time monitoring and control of the charging process to prevent thermal runaway by interrupting power delivery when the cell reaches full charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fast charging is implemented, then charging speed is improved, but internal temperature rises rapidly causing thermal runaway risk
Solution Approach 1:
The patent applies preliminary action by measuring internal temperature continuously during charging and identifying the point of full charge before thermal runaway occurs. The system proactively detects temperature changes and interrupts charging at the optimal moment, preventing the harmful temperature rise before it leads to thermal runaway.
Solution Approach 2:
The patent implements feedback by using an internal temperature sensor to continuously monitor cell temperature during charging and using this information to control the charging process. The temperature measurements provide real-time feedback that allows the system to adjust charging current and interrupt power delivery when full charge is detected, preventing excessive temperature rise.
2Device complexity
If surface-mounted temperature sensors are used, then device complexity is reduced, but measurement precision of internal temperature changes is insufficient
Solution Approach 1:
The patent applies the nested doll principle by placing the temperature sensor inside the battery cell structure. The sensor is positioned within the cell to directly measure internal temperature, with the sensor housing nested within the cell components. This internal placement allows accurate measurement of rapid temperature changes that occur during fast charging, overcoming the limitations of external surface sensors.
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
Enables safe and efficient fast charging by accurately detecting the point of full charge based on internal temperature changes, reducing the risk of cell damage and thermal runaway, and allowing for continuous monitoring of multiple cells.
Implementation Method 1
measuring internal battery temperatures by correlating phase delays with internal cell temperatures
Implementation Method 2
identify an indication that the at least one battery cell is at a point of full charge based on changes in the internal temperature
Data Source
AI summary
A battery charging system includes a charging source, at least one battery cell, a battery internal temperature sensor configured to measure an internal temperature of the at least one battery cell responsive to charging of the at least one battery cell by the charging source, and a charge controller. The charge controller is configured to receive indications of the internal temperature of the at least one battery cell over time, to identify an indication that the at least one battery cell is at a point of full charge based on rate of change of the internal temperature, and to interrupt power delivery from the charging source to the at least one battery cell responsive to the indication that the at least one battery cell is at the point of full charge.