Secondary Battery Charging Control via Heat Generation Calculation
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Solution Overview
Problem
Existing methods for controlling secondary battery charging fail to adequately manage heat generation during reduced charging efficiency, leading to potential over-restriction of charging power and insufficient temperature suppression.
Innovation Solution
A method that calculates heat generation based on inter-electrode-plate voltage, internal resistance, and charging efficiency, and limits charging power according to the cooling ability of the cooling unit, ensuring the amount of generated heat does not exceed the allowable heat, thereby managing charging effectively even in situations with reduced efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If charging power is limited based on conventional methods (temperature or stored electricity amount only), then battery temperature can be controlled, but charging efficiency is reduced and charging time increases
Solution Approach 1:
The patent changes the control parameters from conventional single-parameter control (temperature or stored electricity amount only) to multi-parameter control including charging efficiency, internal resistance, and cooling unit output. By dynamically adjusting charging power based on the relationship between charging efficiency and heat generation, the system achieves better temperature control without unnecessarily limiting charging power, thus resolving the contradiction between temperature control and charging efficiency.
Solution Approach 2:
The patent implements feedback control by continuously monitoring charging efficiency, internal resistance, and temperature, then adjusting charging power accordingly. The control device calculates heat generation based on charging efficiency and compares it with the cooling unit's heat dissipation capacity, creating a closed-loop feedback system that optimizes charging power in real-time to maintain temperature control while maximizing charging efficiency.
2Productivity
If charging power is increased to improve charging speed, then charging efficiency improves, but heat generation increases and may exceed safe limits
Solution Approach 1:
The patent applies dynamic control by continuously adjusting charging power based on real-time monitoring of charging efficiency, internal resistance, and temperature conditions. Rather than using fixed charging power limits, the system dynamically optimizes charging power to maximize charging speed while keeping heat generation within safe limits determined by the cooling unit's capacity.
Solution Approach 2:
The patent performs preliminary calculation of heat generation based on charging efficiency and internal resistance before actual charging occurs. By predicting heat generation in advance and comparing it with the cooling unit's heat dissipation capacity, the system can pre-determine safe charging power levels that achieve fast charging without exceeding thermal limits.
3Temperature
If charging power is restricted to manage heat, then temperature control improves, but charging time increases
Solution Approach 1:
The patent changes from conventional temperature-based control to efficiency-based control by incorporating charging efficiency and internal resistance into the control algorithm. This allows the system to maintain more aggressive charging power levels when charging efficiency is high (indicating lower heat generation), thereby reducing charging time while still maintaining temperature control.
Solution Approach 2:
The patent replaces conventional thermal management approaches with an efficiency-based control system that uses electrical parameters (charging efficiency, internal resistance) to predict and control heat generation. This substitution allows for more precise and responsive control that reduces unnecessary charging power restrictions, thereby reducing charging time while maintaining temperature control.
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 allows for appropriate charging management by limiting charging power when heat generation exceeds allowable levels, suppressing temperature rise and reducing battery deterioration, while allowing unrestricted charging when heat generation is within safe limits.
Implementation Method 1
calculating an amount of heat generated by a secondary battery based on an inter-electrode-plate voltage, an internal resistance, an electric current value, and a charging efficiency of the secondary battery
Data Source
Figure 1~3
Figure 2(A)~2(B)
Figure 4(A)~4(B)
AI summary
The disclosed device for controlling charging of a secondary battery includes a step for calculating an amount of heat generated by a secondary battery on the basis of an inter-electrode-plate voltage, internal resistance, a current value, and charging efficiency; a step for calculating an amount of allowable generated heat of the secondary battery on the basis of a temperature of the secondary battery and the cooling ability of a cooling means that cools the secondary battery; and a step for limiting the charging power of the secondary battery when the aforementioned amount of heat generated is greater than the aforementioned amount of allowable heat generation.