Battery Protection Board Current Detection Heat Reduction
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Solution Overview
Problem
Existing battery protection boards generate excessive heat due to additional impedance components, which can lead to battery damage and safety risks, especially with the increased power consumption and fast charging technologies in mobile terminals.
Innovation Solution
The battery protection board incorporates a detection circuit that uses the impedance of the protection circuit itself to detect voltage drops, eliminating the need for special impedance components and reducing total impedance, thereby minimizing heat generation and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional impedance components are added to the battery protection board for current detection, then detection accuracy is improved, but heat generation increases causing safety risks
Solution Approach 1:
The patent extracts the detection function from separate impedance components and integrates it into the protection circuit's existing impedance. The detection circuit detects voltage drops across the protection circuit's MOS tubes, eliminating the need for additional impedance components while maintaining detection accuracy.
Solution Approach 2:
The patent merges the detection function with the protection circuit by using the protection circuit's existing impedance elements (MOS tubes) for both protection and current detection purposes. This consolidation eliminates separate impedance components and reduces total impedance, thereby minimizing heat generation.
2Measurement precision
If special impedance components are used for voltage drop detection, then current detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the protection circuit's MOS tubes serve dual functions: providing protection against overcharge/overdischarge and enabling current detection through voltage drop measurement. This multi-functionality eliminates the need for separate impedance components and reduces overall circuit complexity.
Solution Approach 2:
The patent extracts the current detection capability from separate impedance components and implements it within the protection circuit itself, using the existing MOS tube impedance for voltage drop detection and current calculation.
3Object-affected harmful factors
If the impedance of the protection board is reduced to minimize heat generation, then safety is improved, but detection accuracy may be compromised
Solution Approach 1:
The patent applies local quality by using the MOS tubes' impedance specifically for detection purposes while maintaining low overall board impedance. The detection circuit measures voltage drops across these specific components, allowing accurate current detection without requiring high total impedance across the entire protection board.
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 solution reduces the heat generated by the battery protection board, improves detection accuracy, and enhances the safety of battery charging and discharging processes by minimizing the risk of overheating and other safety hazards.
Implementation Method 1
detect a first voltage drop generated by an impedance of the at least part of the protection circuit and determine a charging current or a discharging current of the charge and discharge circuit according to the first voltage drop and the impedance of the at least part of the protection circuit
Implementation Method 2
Existing battery protection boards generate excessive heat due to additional impedance components
Data Source
AI summary
Embodiments of the present disclosure provide a battery protection board, a battery and a mobile terminal. A battery protection board includes a protection circuit and a detection circuit. The protection circuit is configured to be coupled to a charge and discharge circuit of a battery in a mobile terminal. The detection circuit is coupled to at least part of the protection circuit and configured to detect a voltage drop generated by an impedance of the at least part of the protection circuit and to determine a charging current or a discharging current of the charge and discharge circuit according to the voltage drop and the impedance of the at least part of the protection circuit during a charge and discharge process of the battery.