Secondary Battery Charging Current Control Under Heat Constraints
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Solution Overview
Problem
Existing charging methods for secondary batteries, such as lithium-ion batteries, fail to effectively control heat generation during charging, leading to potential temperature increases that can hinder efficient charging and battery health.
Innovation Solution
A charging control method that acquires heat information from the battery and adjusts the charging current to maintain a predetermined heat generation level, using a temperature-current map to set charging current values based on battery temperature, thereby limiting temperature increases and ensuring continuous charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If charging current is increased to improve charging speed, then productivity is improved, but temperature increases and heat generation worsens
Solution Approach 1:
The charging control device dynamically adjusts the charging current based on real-time battery temperature measurements. As temperature increases during charging, the system automatically reduces the charging current to prevent excessive heat generation, creating a dynamic balance between charging speed and temperature control
Solution Approach 2:
The system implements a feedback mechanism where the charging control device continuously monitors battery temperature and uses this information to adjust the charging current. The temperature sensor provides feedback to the controller, which then modulates the charging current to maintain safe operating temperatures while maximizing charging efficiency
2Temperature
If charging current is limited to control heat generation, then temperature is controlled, but productivity decreases
Solution Approach 1:
Rather than using a fixed current limit, the system employs dynamic current adjustment based on actual battery temperature conditions. The charging current is continuously adapted to maintain optimal charging speed while staying within safe temperature boundaries
Solution Approach 2:
The system changes the charging current parameter in response to temperature variations. By monitoring temperature and adjusting the current parameter accordingly, the system optimizes the balance between heat generation control and charging efficiency
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 controlled heat generation and stable battery temperatures, enabling efficient and safe charging while extending battery lifespan and maintaining performance.
Implementation Method 1
an amount of heat generation by the secondary battery is determined based on a current and an internal resistance
Data Source
AI summary
A charging control method for controlling charging of a secondary battery includes: an acquisition step of acquiring information on heat of the secondary battery; and a control step of setting, based on the information on the heat of the secondary battery, a charging current value of the secondary battery to control an amount of heat generation by the secondary battery to a predetermined value.