Predictive Battery Charging Temperature Limits for High-Load Operation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium-ion batteries in electric vehicles often face thermal management challenges during high-load and high-speed operations, leading to insufficient cooling and potential battery performance limitations.
Innovation Solution
A method for charging lithium-ion batteries that adjusts the maximum permissible charging temperature based on the predicted subsequent driving and load profile, ensuring the battery operates within safe temperature limits and maintains performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the battery is charged with high charging power to reduce charging time, then the charging speed is improved, but the battery temperature increases excessively and may exceed the maximum permissible operating temperature
Solution Approach 1:
The method performs a preliminary determination of the subsequent operating state and predicted thermal losses before completing the charging process. Based on this advance information, the maximum permissible charging temperature is pre-calculated and used to control the charging power, preventing temperature exceedance before it occurs
Solution Approach 2:
The method establishes a feedback loop where the actual battery temperature, subsequent operating state, and thermal losses are continuously monitored. The charging power is dynamically adjusted based on this feedback to maintain the battery temperature within the calculated maximum permissible charging temperature, thus resolving the contradiction between charging speed and temperature control
2Temperature
If the cooling system power is increased to dissipate thermal losses during high-load operation, then the battery temperature control is improved, but the device complexity and cost increase
Solution Approach 1:
The method calculates the predicted thermal losses and determines the maximum permissible charging temperature in advance, before the actual high-load operation begins. This preliminary determination allows the cooling system to be sized appropriately rather than requiring excessive cooling capacity for all possible scenarios
Solution Approach 2:
The method dynamically adjusts the maximum permissible operating temperature and maximum permissible charging temperature parameters based on the predicted subsequent operating state and thermal losses. This parameter adaptation allows the existing cooling system to operate more efficiently without requiring increased system power or complexity
3Reliability
If the maximum permissible operating temperature is set lower to prevent overheating, then the battery safety is improved, but the available power and performance during operation are reduced
Solution Approach 1:
The method dynamically adapts the maximum permissible operating temperature parameter based on the predicted subsequent operating state and actual thermal losses. When thermal losses are low, a higher maximum temperature is permitted, maintaining battery performance. When thermal losses are high, the maximum temperature is reduced to ensure safety, thus optimizing both reliability and power availability
Solution Approach 2:
The method transforms the static maximum permissible operating temperature into a dynamic parameter that changes based on real-time conditions including predicted operating state and thermal losses. This dynamic adjustment allows the battery to operate at higher temperatures when safe, maximizing power output while maintaining safety when conditions require it
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 prevents battery overheating and performance limitations by maintaining the battery temperature below the maximum permissible operating temperature, even during high-load conditions, thus ensuring reliable vehicle performance.
Implementation Method 1
rechargeable batteries are used to repeatedly convert chemical energy into electrical energy
Implementation Method 2
the temperature of the battery increases due to thermal losses resulting from the internal resistance of the battery
Data Source
AI summary
A method for charging and operating a battery. The battery is charged in a charging process. It is provided that a maximum permissible predictive charging temperature of the battery during the charging process is specified depending on a specifiable operating state of the battery subsequent to the charging process, such that the maximum operating temperature of the battery during the operating state is less than or equal to a maximum permissible operating temperature of the battery.