Battery Management System with Segmented Charge Circuits
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Solution Overview
Problem
Existing battery management systems struggle to efficiently manage high charge currents during rapid charging of lithium rechargeable batteries, potentially leading to overcharging and battery damage, while maintaining safe operation.
Innovation Solution
A battery management system with multiple charge circuits and switches that control charging based on output signal voltages, allowing for normal and express mode charging, where the second charge circuit handles higher currents with a lower turn-on resistance, ensuring safe and efficient charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single charge circuit is used for battery charging, then the device complexity is low, but the charging speed and productivity are limited
Solution Approach 1:
The charge circuit is divided into multiple independent charge circuits (first charge circuit and second charge circuit) with different current capabilities. The first charge circuit handles normal charging with lower current, while the second charge circuit enables express charging with higher current. This segmentation allows the system to achieve high charging speeds when needed while maintaining simplicity for normal operation.
2Productivity
If high charge current is supplied for rapid charging, then the charging speed increases, but the risk of overcharging and battery damage increases
Solution Approach 1:
The system dynamically switches between different charge circuits based on real-time battery state and charging requirements. The control unit monitors battery conditions and selectively activates either the first charge circuit for normal charging or the second charge circuit for express charging, adjusting the charging current dynamically to maintain safety while maximizing charging speed when appropriate.
Solution Approach 2:
The control unit continuously monitors battery parameters such as voltage, current, and temperature, and uses this feedback information to determine which charge circuit to activate and when to switch between them. This feedback mechanism ensures that high current charging is only applied when safe, preventing overcharging and battery damage while enabling rapid charging when conditions permit.
3Adaptability or versatility
If multiple charge circuits with different currents are used, then the charging versatility and productivity improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The charging system is segmented into distinct charge circuits with clearly defined functions - the first charge circuit for normal charging and the second charge circuit for express charging. Each segment is designed with specific current capabilities, making the system versatile while keeping individual components relatively simple and manageable for manufacturing.
Data Source
AI summary
A battery management system and a method of driving the same are provided. When the output signal of a charger is higher than a first voltage, a battery cell is charged with a first current by a first charge circuit. When the output signal of the charger is higher than a second voltage, a battery cell is charged with a second current by a second charge circuit. The second voltage is higher than the first voltage and second current is higher than the first current.