Battery Pack Dynamic Paralleling to Prevent Loop Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric vehicle battery packs with multiple compartments face challenges in maintaining consistent power levels over time, leading to potential loop charging issues that can cause irreversible damage, especially during temperature and power fluctuations.
Innovation Solution
A master-slave dynamic paralleling method for battery packs, where idle packs are dynamically connected to active packs based on voltage differences and fault protection states, allowing for adaptive paralleling modes to ensure safe and efficient charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery packs are operated in parallel to expand capacity and increase mileage, then the energy storage capacity and power output are improved, but the risk of loop charging increases when battery packs have inconsistent power levels
Solution Approach 1:
The patent implements dynamic control of battery pack paralleling based on real-time power level detection. The system continuously monitors the power levels of master and slave battery packs and dynamically adjusts the paralleling state. When power levels are inconsistent, the system dynamically switches from a paralleled configuration to a non-paralleled configuration, preventing loop charging while maintaining capacity expansion benefits during stable operation.
Solution Approach 2:
The system employs feedback control by continuously detecting the power levels of battery packs and using this information to control the switch circuits. The detection unit monitors power levels, and the control unit uses this feedback to determine whether to enable or disable the paralleled connection. This closed-loop feedback mechanism ensures that loop charging is prevented while maintaining optimal parallel operation when conditions permit.
2Quantity of substance
If battery packs with inconsistent power levels are connected in parallel, then capacity expansion is achieved, but irreversible damage occurs to battery cells under extreme temperature and power conditions
Solution Approach 1:
The system applies preliminary anti-action by proactively detecting power level inconsistencies before they can cause harmful loop charging effects. The detection unit continuously monitors power levels and predicts potential harmful conditions. When inconsistency is detected, the control unit preemptively disables the paralleled connection through the switch circuit, preventing the harmful effects from occurring in the first place rather than reacting after damage occurs.
Solution Approach 2:
The patent implements beforehand cushioning by establishing protective control logic that cushions against potential harmful effects. The system prepares protective measures by continuously monitoring battery pack parameters and having the control unit ready to switch off the paralleled connection when power level differences indicate potential risk. This cushioning approach protects battery cells from irreversible damage by preventing harmful conditions before they can cause actual harm.
3Reliability
If dynamic paralleling control is implemented to prevent loop charging, then battery safety is improved, but the system complexity increases due to additional control mechanisms
Solution Approach 1:
The patent reduces system complexity through segmentation by dividing the battery management system into distinct functional modules: a detection unit for monitoring power levels, a control unit for decision-making, and switch circuits for execution. This modular segmentation allows each component to perform a specific function independently, making the overall complex system more manageable and maintainable while achieving the safety benefits of dynamic paralleling control.
Data Source
AI summary
A master-slave dynamic paralleling method for battery packs, includes: during discharging, discharging a battery pack with the highest power, and when a voltage difference between battery packs reaches a preset threshold range and no fault protection state is triggered, parallel-connecting a battery pack to the lowest power for discharging, and performing paralleling mode switching; and during charging, charging a battery pack with the lowest voltage, and when voltages of all battery packs are consistent and no fault protection state is triggered, parallel-connecting another battery pack for charging, and performing paralleling mode switching.