Multi-Battery Pack Discharge Control for Circulating Current Prevention
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Solution Overview
Problem
In a multi-battery pack system, voltage differences between battery packs can generate large circulating currents during low load power, leading to overload and potential damage.
Innovation Solution
A method to detect real-time load power and selectively enable or disable the discharge function of battery packs based on their state of charge and capacity, ensuring only the target battery pack operates during low load conditions to prevent circulating currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs discharge in parallel, then the power supply capacity is improved, but circulating current is generated causing overload and potential damage
Solution Approach 1:
The patent implements dynamic control of battery pack discharge functions based on real-time load power detection. The control unit dynamically adjusts the number of active battery packs according to load conditions, switching between single battery pack operation (when load power is low) and multiple battery pack parallel operation (when load power is high), thereby adapting the power supply capacity to actual demands while preventing circulating current issues
Solution Approach 2:
The patent employs a feedback mechanism where the control unit continuously detects real-time load power and uses this information to control the discharge functions of battery packs. This closed-loop feedback system ensures that battery packs are enabled or disabled based on actual load requirements, preventing the generation of circulating currents while maintaining optimal power supply capacity
2Quantity of substance
If multiple battery packs operate in parallel, then the energy storage capacity is improved, but the system complexity increases
Solution Approach 1:
The patent segments the battery pack system into independently controllable units, where each battery pack can be individually enabled or disabled through control units. This segmentation allows the system to simplify operations by activating only the necessary number of battery packs based on load requirements, thereby reducing system complexity while maintaining adequate energy storage capacity
Solution Approach 2:
The control unit is designed with universal functionality to manage multiple battery packs, performing both detection of load power and control of discharge functions. This multi-functional control unit reduces overall system complexity by consolidating control logic while still enabling flexible management of multiple battery packs for adequate energy storage capacity
Data Source
AI summary
A battery pack control method includes: detecting real-time load power of a multi-battery pack system; and when the real-time load power is less than a first power threshold, and at least two battery packs discharge in parallel, determining a target battery pack from the battery packs discharging in parallel, maintaining a discharge function of the target battery pack, and disabling a discharge function of another battery pack discharging in parallel other than the target battery pack.