Battery Charging Control Circuit with Segmented Temperature Detection
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Solution Overview
Problem
Conventional charging circuits for secondary batteries can only stop charging in response to high temperatures, lacking the ability to perform fine control based on temperature changes, which limits safety and charging efficiency.
Innovation Solution
A charging control circuit with a temperature detection terminal, a temperature comparison part using four threshold voltages, and a control part that adjusts charging current and voltage based on temperature ranges, allowing for fine control and optimized charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single threshold voltage is used to detect high temperature, then charging can be stopped to prevent overcharging or heating, but fine control according to temperature changes cannot be performed
Solution Approach 1:
The single threshold voltage detection is segmented into four threshold voltages (V1, V2, V3, V4) corresponding to four reference temperatures (T1, T2, T3, T4). This divides the temperature detection range into multiple segments, allowing the system to identify specific temperature ranges (e.g., T1-T2, T2-T3, T3-T4) and apply different charging control strategies for each segment, thereby achieving fine control while maintaining safety.
2Reliability
If charging is stopped in response to high temperature detection, then battery safety is ensured, but charging efficiency is reduced due to inability to perform proper control according to temperature range
Solution Approach 1:
The charging control is made dynamic by adjusting charging current based on the detected temperature range. Instead of a static stop-or-continue decision, the system dynamically modifies charging parameters: using first charging current in lower temperature ranges, second charging current in intermediate ranges, and third charging current in higher temperature ranges. This dynamic adjustment maintains safety while optimizing charging efficiency at each temperature level.
Solution Approach 2:
The system changes the charging current parameter according to the detected temperature range. By comparing the detected voltage with four threshold voltages, the system identifies which temperature range the battery is in and adjusts the charging current accordingly. This parameter change approach allows efficient charging in safer temperature ranges while preventing overheating in higher temperature ranges.
3Productivity
If four threshold voltages and comparators are added for fine temperature control, then charging efficiency and safety are improved, but device complexity increases
Solution Approach 1:
The four comparators are merged into a single integrated temperature comparison circuit that processes the detected voltage against all four threshold voltages simultaneously. The circuit combines the threshold voltage setting (via voltage divider) and comparison functions in one module, reducing the need for separate discrete components and simplifying the overall circuit architecture while maintaining the fine temperature control capability.
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 precise control of charging current and voltage according to temperature, ensuring safety and maximizing charging efficiency by adjusting current levels based on temperature ranges, thereby extending battery life.
Implementation Method 1
a thermistor to detect the temperature of the secondary battery as a change in resistance
Data Source
AI summary
A charging control circuit for a secondary battery includes a temperature detection terminal for detecting the temperature of a secondary battery from an input detected voltage; a temperature comparison part having four threshold voltages corresponding to four reference temperatures, the temperature comparison part being configured to compare the four threshold voltages with the detected voltage input to the temperature detection terminal and to output a temperature range signal indicating the temperature range of the detected voltage; and a control part configured to control a charging current and/or a charging voltage based on the temperature range signal output from the temperature comparison part.