Multi-Battery Pack Voltage Switching for Balanced Power Supply
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Solution Overview
Problem
In multi-battery pack systems, switching battery packs for charging or discharging leads to insufficient power supply and unbalanced power distribution among battery packs, resulting in low charging or discharging efficiency due to paralleling failures.
Innovation Solution
A control method that determines a first and second reference battery pack based on charging-discharging states and voltage differences, adjusting the parallel voltage range to selectively turn off or on battery packs with voltage differences exceeding a threshold, ensuring balanced power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If all enabled battery packs are turned off when switching battery packs for charging or discharging, then the battery pack that needs to be turned on can be activated, but power supply becomes insufficient and paralleling fails due to unbalanced power among battery packs
Solution Approach 1:
The patent implements dynamic battery pack management by continuously monitoring voltage differences and dynamically adjusting which battery packs remain enabled. Instead of static on/off switching, the system adaptively maintains enabled battery packs based on real-time voltage conditions, allowing seamless transitions while maintaining power supply stability.
Solution Approach 2:
The patent introduces a voltage difference threshold parameter to control battery pack switching decisions. By monitoring whether voltage differences exceed this parameter threshold, the system intelligently determines when to switch battery packs, resolving the contradiction between switching capability and power supply stability.
2Adaptability or versatility
If all enabled battery packs are turned off when switching, then the target battery pack can be activated, but charging or discharging efficiency decreases due to unbalanced power distribution
Solution Approach 1:
The system dynamically evaluates voltage differences and selectively maintains enabled battery packs during switching operations. This dynamic approach allows the system to activate target battery packs while preserving other packs with compatible voltages, thereby maintaining high charging or discharging efficiency without complete system shutdowns.
Solution Approach 2:
By introducing voltage difference threshold as a control parameter, the system optimizes switching decisions to maintain productivity. When voltage differences remain within acceptable thresholds, multiple battery packs can operate simultaneously, maximizing charging or discharging efficiency while still providing activation flexibility.
3Reliability
If battery packs are switched based on voltage differences exceeding a threshold, then power balance is maintained, but system complexity increases due to voltage range determination and selective switching control
Solution Approach 1:
The patent uses a simple voltage difference threshold parameter to control switching decisions, avoiding complex control algorithms. This parameter-based approach maintains power balance stability through straightforward comparisons while keeping control logic relatively simple and易于 implementation.
Solution Approach 2:
The system performs self-monitoring of voltage differences and automatically makes switching decisions based on predefined thresholds. This self-service mechanism reduces the need for complex external control logic, as the system autonomously maintains power balance through simple threshold-based decision making.
Data Source
AI summary
A control method of a multi-battery pack system is provided. The method includes: determining a first reference battery pack based on a charging-discharging state of the multi-battery pack system and battery voltages of enabled battery packs; determining a second reference battery pack based on the charging-discharging state of the multi-battery pack system and battery voltages of non-enabled battery packs; determining a to-be-turned off battery pack and a to-be-turned on battery pack based on a battery voltage of the first reference battery pack and a battery voltage of the second reference battery pack; and controlling to turn off the to-be-turned off battery pack and turn on the to-be-turned on battery pack.