Power Battery Equalization Control Circuit for Extended Efficiency
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Solution Overview
Problem
The existing power battery equalization methods, particularly passive equalization, suffer from low efficiency due to short equalization time and limited functionality during charging/discharging processes, leading to reduced charging/discharging capacity and shorter battery life.
Innovation Solution
A method and circuit for power battery equalization control that detects and monitors cells to determine equalization starting and stopping conditions, allowing for extended equalization times based on calculated values, ensuring equalization is performed during various states (charging, discharging, or standing) until a predetermined time period is met, thereby improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If passive equalization is performed only during standing state, then the circuit structure remains simple and cost remains low, but the equalization time becomes too short and equalization efficiency becomes low
Solution Approach 1:
The patent makes the equalization function dynamic by enabling it to operate during charging/discharging processes in addition to standing state. The control unit dynamically activates the equalization circuit based on real-time detection of battery cell states and charging/discharging conditions, allowing the system to adaptively perform equalization at appropriate moments rather than being restricted to static standing state only.
Solution Approach 2:
The patent implements continuous equalization action by allowing the equalization circuit to operate continuously during charging/discharging processes when conditions are met. Instead of performing equalization only during brief standing periods, the system can continuously monitor and perform equalization throughout the charging/discharging cycles, significantly increasing the total equalization time and efficiency.
2Productivity
If equalization is performed during charging/discharging process, then equalization efficiency improves and equalization time extends, but the control system complexity increases
Solution Approach 1:
The control unit is designed with multi-functionality, serving both as the charging/discharging controller and as the equalization controller. This universal controller integrates multiple functions including charge control, discharge control, and equalization control, thereby improving equalization efficiency without requiring a separate dedicated equalization control system, thus avoiding excessive complexity increase.
Solution Approach 2:
The system performs self-service by using its own control unit to simultaneously manage charging/discharging and equalization processes. The control unit autonomously detects battery cell states and determines when to activate equalization during charging/discharging, eliminating the need for external or separate control mechanisms and keeping the overall system complexity manageable.
3Manufacturing precision
If equalization time is extended to meet calculated time period, then voltage and capacity differences between cells are reduced, but the risk of over-discharging and under-voltage issues increases
Solution Approach 1:
The patent implements real-time feedback control by continuously monitoring battery cell voltages and states during equalization. The control unit receives real-time data from detection circuits and adjusts the equalization process accordingly, stopping or modulating equalization when cells approach critical voltage thresholds. This feedback mechanism ensures that extended equalization time achieves voltage uniformity while preventing over-discharging and under-voltage conditions that would compromise battery safety.
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 enhances equalization efficiency by extending the equalization time, reducing voltage and capacity differences between cells, and ensuring service safety and extended battery life by preventing over-discharging and under-voltage issues.
Implementation Method 1
The passive equalization, also known as lossy equalization, makes the surplus electric quantity in the battery cell with high electric quantity to be discharged by connecting resistors in parallel
Data Source
AI summary
Disclosed are equalization control method, apparatus and circuit for a power battery. The equalization control method includes: detecting a to-be-equalized cell in the power battery satisfying a preset equalization starting condition, and starting to perform an equalization on the to-be-equalized cell; in a process of performing the equalization on the to-be-equalized cell, determining whether the to-be-equalized cell satisfies an equalization stopping condition; when it is determined that the to-be-equalized cell satisfies the equalization stopping condition, stopping performing the equalization on the to-be-equalized cell, and when the to-be-equalized cell satisfies an equalization continuing condition, continuing to perform the equalization on the to-be-equalized cell; and when it is determined that the to-be-equalized cell does not satisfy the equalization stopping condition, continuing performing the equalization on the to-be-equalized cell, and finishing the equalization until the time period during which the equalization is performed on the to-be-equalized cell satisfies the equalization time calculated value.