Battery Discharge Current Switching for Low-Temperature Power Output
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Solution Overview
Problem
Traction batteries experience a significant decline in discharge capability in low-temperature environments, making it difficult to release power effectively.
Innovation Solution
A discharge method and apparatus that uses a higher first discharge current to heat the battery when the temperature is below a preset threshold, switching to a lower second discharge current once the temperature rises, thereby improving discharge capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher discharge current is used to heat the battery in low-temperature environments, then the discharge capability is improved, but the energy loss increases
Solution Approach 1:
The system performs preliminary heating action by discharging at a first discharge current before the battery reaches optimal operating temperature. This preliminary heating enables the battery to achieve sufficient temperature for normal discharge operations, thereby improving discharge capability in low-temperature environments while managing energy loss through controlled heating duration
Solution Approach 2:
The discharge current is dynamically adjusted based on battery temperature conditions. The system switches from a first discharge current (higher) when temperature is below the threshold to a second discharge current (lower or normal) when temperature reaches the threshold. This dynamic adjustment optimizes both discharge capability and energy utilization efficiency
2Temperature
If a higher discharge current is applied to heat the battery, then the temperature rises quickly, but the discharge time is extended
Solution Approach 1:
The system applies a first discharge current as a preliminary heating phase to quickly raise battery temperature to the threshold. Once the temperature threshold is reached, the system switches to a second discharge current for the remaining discharge process. This two-stage approach minimizes the time spent at high current while ensuring sufficient heating, thereby balancing temperature rise speed with overall discharge time
Solution Approach 2:
The discharge process is divided into periodic stages: an initial heating stage with first discharge current when temperature is below threshold, and a normal discharge stage with second discharge current when temperature reaches threshold. This periodic switching optimizes both heating efficiency and total discharge duration
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 approach effectively increases the battery's discharge capability in low-temperature environments by quickly raising the temperature and optimizing energy utilization, ensuring reliable power output and safety.
Implementation Method 1
the first discharge current is used for heating the battery during discharging
Data Source
AI summary
This application provides a discharge method and discharge apparatus for battery, able to improve the discharge capability of batteries in low-temperature environments. The discharge method includes: obtaining a temperature of a battery; and determining, when the temperature of the battery is lower than a preset temperature threshold, to discharge the battery based on a first discharge current until the battery meets a preset condition, and then determining to discharge the battery based on a second discharge current, where the first discharge current is used for heating the battery during discharging, and the first discharge current is greater than the second discharge current.