Battery Protection Circuit for Low-Temperature Discharge Threshold Control
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Solution Overview
Problem
In low temperature environments, the electric quantity of a battery cannot be effectively utilized due to the under-voltage protection threshold and discharging cutoff voltage being set based on normal temperature performance, leading to battery damage and inefficiency.
Innovation Solution
A charging/discharging protection circuit that adjusts the under-voltage protection threshold and discharging cutoff voltage based on battery temperature and current, allowing the battery to continue discharging until the reduced threshold is reached, and increases the threshold when necessary to prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the under-voltage protection threshold and discharging cutoff voltage are set based on normal temperature battery performance, then the battery safety is ensured at normal temperature, but the electric quantity of the battery cannot be effectively utilized in low temperature environment
Solution Approach 1:
The patent implements dynamic adjustment of the under-voltage protection threshold based on battery temperature. When temperature is below a threshold, the protection threshold is reduced, allowing the battery to discharge to lower voltages and utilize remaining electric quantity. When temperature is normal or high, the original protection threshold is maintained to ensure battery safety. This dynamic parameter adjustment resolves the contradiction between safety and productivity.
Solution Approach 2:
The patent changes the voltage parameter (under-voltage protection threshold) based on temperature conditions. By reducing the voltage threshold in low temperature environments, the system allows deeper discharge while maintaining safety. This parameter change enables the battery to provide more electric quantity in cold conditions without compromising overall safety.
2Productivity
If the under-voltage protection threshold is reduced to utilize remaining electric quantity in low temperature, then the electric quantity utilization is improved, but the battery may be damaged if the threshold is too low
Solution Approach 1:
The patent applies different protection thresholds for different temperature conditions. Instead of using a single global threshold, it creates localized protection levels: a reduced threshold for low temperature operation and a higher threshold for normal/high temperature operation. This local quality approach allows optimal discharge depth for each temperature condition, maximizing productivity while maintaining reliability.
Solution Approach 2:
The protection threshold dynamically adapts to temperature changes. The system continuously monitors temperature and adjusts the under-voltage protection threshold accordingly, ensuring that the battery operates safely across different thermal conditions while maximizing electric quantity utilization when appropriate.
3Reliability
If the discharging cutoff voltage is set high to prevent battery damage, then the battery safety is improved, but the remaining electric quantity cannot be utilized
Solution Approach 1:
The patent changes the discharging cutoff voltage parameter based on temperature conditions. In low temperature environments, the cutoff voltage is reduced, allowing the battery to discharge more completely and reducing energy waste. In normal temperature conditions, the higher cutoff voltage is maintained to prevent battery damage. This conditional parameter change resolves the contradiction between safety and energy utilization.
Data Source
AI summary
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.