Battery Pack Current Control via Series Resistor Balancing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery cell balancing methods result in unwanted cell voltage drops and reduced power delivery capacity due to inefficient current control during the balancing process, leading to charge loss and suboptimal battery performance.
Innovation Solution
A method and system that control a relatively low current through a resistor in series with the battery pack to minimize charge loss and optimize power delivery, using a control unit to measure voltage across the resistor and adjust the current accordingly, especially during cell balancing when charge and discharge ability is below a predetermined limit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cell balancing is performed using conventional methods, then battery cell voltage differences are equalized, but cell voltage drops and power delivery capacity are reduced
Solution Approach 1:
The patent changes the current parameter during cell balancing by switching between a first current value (higher) and a second current value (lower). This dynamic parameter adjustment allows the system to equalize cell voltages while minimizing voltage drops and maintaining power delivery capacity, resolving the contradiction between reliability and power.
2Reliability
If cell balancing is performed continuously, then battery cell voltage differences are equalized, but charge loss increases
Solution Approach 1:
The patent implements periodic cell balancing by alternating between different current values rather than applying continuous current. This periodic action achieves voltage equalization over time while reducing overall charge loss, as the lower current value is applied during periods when equalization is less critical.
3Productivity
If high current is used for cell balancing, then battery cell voltage differences are equalized faster, but cell voltage drops increase
Solution Approach 1:
The patent makes the current value dynamic by switching between a first current value and a second current value based on real-time battery conditions. This dynamic adjustment optimizes the balance between balancing speed and voltage stability, allowing faster equalization when needed while maintaining voltage stability when the battery is in optimal condition.
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 reduces cell voltage drops and optimizes power delivery capacity by minimizing charge loss during balancing, ensuring efficient cell balancing and maintaining battery performance over time.
Implementation Method 1
measuring the voltage across said resistor, thereby obtaining a value of said current
Data Source
AI summary
A method for controlling a current being fed to a battery pack including a plurality of battery cells connected in series and providing an output battery voltage includes the steps of: feeding a relatively low current through a resistor being arranged in series with the battery pack; and measuring the voltage across the resistor, thereby obtaining a value of the current. A system for controlling a current being fed to a battery pack is also provided.