EV Battery Cell Charging Control Using Internal Resistance Heating
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Solution Overview
Problem
Existing thermal management methods for electric vehicle batteries consume significant time, limiting the charging speed and efficiency, especially in varying ambient temperatures.
Innovation Solution
A charging control method that dynamically adjusts thermal management functions based on the cell's temperature and state of charge, disabling heating or cooling functions when the target temperature is reached to optimize charging speed and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermal management is performed on the power battery group during charging, then the charge/discharge speed is improved and safety is ensured, but charging time increases due to repeated thermal management operations
Solution Approach 1:
The patent utilizes the cell's own internal resistance to generate heat during charging, eliminating the need for external heating systems. The charging current passing through the cell's internal resistance naturally produces heat (Q=I²Rt), which maintains the cell temperature within the optimal charging range, allowing the cell to heat itself during the charging process
Solution Approach 2:
The patent converts the previously harmful effect of internal resistance (which causes energy loss and heat generation) into a beneficial heating source. By disabling external heating functions when the cell temperature reaches the target range, the system allows the natural resistive heating during charging to maintain optimal temperature, transforming what was considered waste energy into a useful thermal management mechanism
2Productivity
If external heating is applied to the cell, then the charging speed is improved, but energy consumption increases
Solution Approach 1:
The system eliminates external heating by utilizing the cell's internal resistance to generate the necessary heat during charging. The charging current naturally produces heat through the cell's internal resistance, which is sufficient to maintain the cell temperature in the optimal range, thereby eliminating the need for additional energy-consuming external heating systems
Solution Approach 2:
The patent transforms the energy loss due to internal resistance into a beneficial heating effect. The heat that was previously considered waste energy is now utilized to maintain optimal cell temperature, eliminating the need for separate heating energy input and reducing overall energy consumption
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
Enables fast charging by maintaining optimal cell temperature through internal resistance heating and minimizing energy waste, while ensuring safety by preventing thermal overloads.
Implementation Method 1
the charging current is consumed on the internal resistance of the cell, so that heat is generated to maintain the temperature of the cell
Data Source
AI summary
A mobile apparatus, a charging control method, and a chip relate to the field of electric vehicle charging, where the mobile apparatus is configured to connect to a charging pile to form a charging system. The charging pile is configured to charge a cell of the mobile apparatus. The method for fast charging of the cell includes: detecting a temperature of the cell; and if the temperature of the cell is equal to a target temperature, disabling a heating function for the cell until charging ends, where a temperature change of the cell is positively correlated with internal resistance of the cell and a charging current provided by the charging pile.