Battery Protection Circuit for Low-Temperature Discharge Cutoff
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Solution Overview
Problem
In low temperature environments, the existing under-voltage protection thresholds and discharging cutoff voltages set for batteries at normal temperatures result in unused battery energy, as the power consumption load cannot continue to obtain energy when the battery's output voltage reaches the cutoff voltage, leading to reduced battery utilization.
Innovation Solution
A charging/discharging protection circuit that dynamically adjusts the under-voltage protection threshold and discharging cutoff voltage based on temperature and discharging current, reducing the threshold when the battery is in a low temperature environment with high discharging current, and increasing it when the output voltage falls below the cutoff voltage to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the under-voltage protection threshold and discharging cutoff voltage are set according to normal temperature battery performance, then battery safety is ensured at normal temperature, but battery energy cannot be fully utilized in low temperature environments
Solution Approach 1:
The patent applies dynamics by making the under-voltage protection threshold adjustable rather than fixed. The protection circuit dynamically changes the threshold value based on detected temperature and discharge current conditions. When low temperature and high discharge current are detected, the threshold is reduced to allow continued battery operation, thereby resolving the contradiction between safety and energy utilization.
Solution Approach 2:
The patent changes the parameter of the under-voltage protection threshold based on operating conditions. By detecting temperature and discharge current, the system adjusts the voltage threshold parameter to suit different environmental conditions. This allows the battery to operate safely at normal temperatures while maximizing energy utilization in low temperature environments where previously it would have been prematurely cutoff.
2Use of energy by moving object
If the under-voltage protection threshold is reduced in low temperature environments, then battery energy utilization is improved, but battery damage risk increases if the threshold is set too low
Solution Approach 1:
The patent applies local quality by implementing different protection threshold levels for different operating conditions. Instead of a single global threshold, the system creates localized threshold values suited to specific temperature and current conditions. This allows aggressive energy utilization in low-temperature high-current scenarios while maintaining conservative safety margins in other conditions.
Solution Approach 2:
The patent implements feedback by continuously monitoring temperature and discharge current, then using this information to adjust the protection threshold. The system receives feedback from the battery's actual state and dynamically responds by modifying the threshold, ensuring that energy utilization is maximized only when safe operating conditions permit.
3Device complexity
If a fixed discharging cutoff voltage is used, then the protection circuit is simple in structure, but battery energy is wasted in low temperature environments
Solution Approach 1:
The patent transforms the static, fixed discharging cutoff voltage into a dynamic, adjustable parameter. The protection circuit incorporates temperature and current sensing capabilities that enable real-time adjustment of the cutoff voltage. This dynamic approach maintains structural simplicity while dramatically improving energy utilization in low temperature environments.
Solution Approach 2:
The patent makes the protection circuit multi-functional by enabling it to operate effectively across different temperature conditions. The same protection circuit structure serves both normal temperature operation (with standard thresholds) and low temperature operation (with reduced thresholds), eliminating the need for separate circuits for different environments.
Data Source
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AI summary
The present application relates to the field of charging, and provides a charging/discharging protection circuit, a terminal device, and a battery discharging control method, for use in solving the problem that the electric quantity of a battery cannot be effectively utilized in a low temperature environment. The charging/discharging protection circuit comprises a power supply end, a grounding end, and an under-voltage protection threshold control end; the power supply end is connected to a positive electrode of a battery; the grounding end is connected to a negative electrode of the battery; the under-voltage protection threshold control end is configured to receive a first control signal. The charging/discharging protection circuit is configured to reduce an under-voltage protection threshold of the battery under the control of the first control signal when the temperature of the battery is smaller than a set temperature threshold and the discharging current of the battery is greater than a set current threshold.