Inductor-Based Voltage Balance Circuit for Dual Cell Battery
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Solution Overview
Problem
Current voltage balancing methods for dual cell rechargeable batteries suffer from poor efficiency, energy loss, and inability to perform real-time voltage detection, leading to safety issues and reduced battery life due to excessive discharging and overheating.
Innovation Solution
A voltage balance circuit with an integrated control module that includes a voltage detection module, delay control module, and DC modulation module, utilizing an inductor and resistor to detect current flow and generate balancing activation and directional signals, allowing for efficient voltage balancing and real-time detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If energy dissipation method is used for voltage balancing, then voltage equilibrium between battery cells is achieved, but energy loss increases and balancing efficiency decreases
Solution Approach 1:
The patent introduces an inductor as an intermediary component to enable energy transfer between battery cells. The inductor stores energy from the higher-voltage cell and releases it to the lower-voltage cell, serving as a mediator that facilitates voltage balancing without direct energy dissipation. This resolves the contradiction by maintaining voltage equilibrium while minimizing energy loss through controlled energy transfer.
Solution Approach 2:
The patent changes the operating parameters of the balancing circuit by using an inductor with specific inductance values and controlling the discharge current within a specific range (0.5-2A). By optimizing these parameters, the circuit achieves efficient voltage balancing with reduced energy loss compared to traditional resistive dissipation methods.
2Loss of time
If discharge logic loop current is increased to improve balancing speed, then time to reach equilibrium decreases, but discharge current and energy loss increase
Solution Approach 1:
The patent employs periodic switching of MOS tubes to control the discharge logic loop. By periodically switching the MOS tubes on and off, the circuit achieves controlled energy transfer that balances voltage efficiently without requiring continuously high discharge currents. This periodic action reduces both balancing time and energy loss simultaneously.
Solution Approach 2:
The patent uses dynamic control of the discharge current through MOS tube switching, allowing the current to vary during the balancing process. The current starts higher to quickly reduce voltage difference, then decreases as equilibrium approaches. This dynamic adjustment optimizes both balancing speed and energy efficiency.
3Reliability
If traditional balancing circuit is used, then voltage balancing is achieved, but real-time voltage detection capability is lacking
Solution Approach 1:
The patent integrates multiple functions into a single balancing circuit. The circuit simultaneously performs voltage balancing and real-time voltage detection through the same control module. The control module monitors battery voltage continuously and activates balancing only when voltage difference exceeds the threshold, achieving both functions without separate dedicated circuits.
4Reliability
If resistor-based discharge circuit is used, then voltage balancing is achieved, but resistor temperature increases causing safety issues
Solution Approach 1:
The patent replaces the traditional resistor-based energy dissipation mechanism with an inductor-based energy transfer mechanism. Instead of converting electrical energy directly to heat through resistor dissipation, the inductor stores energy in its magnetic field and transfers it to the lower-voltage cell. This substitution eliminates excessive heat generation while maintaining voltage balancing functionality.
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
Enhances voltage balancing efficiency, reduces energy loss, and enables real-time voltage detection, thereby extending battery life and ensuring safety by preventing overheating.
Implementation Method 1
an inductor; a resistor coupled to the inductor, the resistor capable of detecting an amount of current flow within the inductor
Implementation Method 2
a resistor coupled to the inductor, the resistor capable of detecting an amount of current flow within the inductor
Data Source
AI summary
Voltage balance circuit for dual cell rechargeable battery having a balancing circuit coupled to an integrated control circuit. The balancing circuit can be configured to charge and discharge current during a voltage balancing process allowing a higher charged cell to discharge or dissipate excess capacity to a lower charged cell. The integrated control circuit, having a plurality of modules, can be configured to output balancing directional and timing control signals for signaling the activation and deactivation of the voltage balancing process.