Battery Pack Charging Scheme Selection by Minimum Cell Voltage
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Solution Overview
Problem
Current charging strategies for portable energy storage power supplies result in low charging efficiency, long charging periods, high heating power consumption, and safety concerns due to increased battery temperature, which can lead to lithium precipitation and reduced cycle service life.
Innovation Solution
A charging method that involves obtaining the voltage of each cell in a battery pack and selecting a corresponding charging scheme based on the minimum voltage, using a combination of first and second charging schemes that adjust charging power and duration based on cell voltage and temperature to optimize charging efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single charging strategy is used, then the charging process is simple, but the charging efficiency is low and the charging period is long
Solution Approach 1:
The patent implements dynamic charging strategy adjustment based on real-time battery state monitoring. The system transitions from a static single charging strategy to a dynamic multi-strategy approach, where charging parameters are continuously adapted according to battery temperature, voltage, and charge state, thereby improving charging efficiency without excessive complexity
Solution Approach 2:
The patent changes charging parameters (current, voltage, power) based on battery state conditions. By monitoring battery temperature, cell voltage differences, and charge levels, the system adjusts charging parameters in real-time to optimize charging efficiency and prevent harmful effects like lithium precipitation and overheating
2Speed
If high charging current is applied, then the charging speed is fast, but the heating power consumption increases and safety risks arise
Solution Approach 1:
The patent implements periodic monitoring and adjustment of charging current based on battery temperature and state of charge. The system uses periodic detection of battery parameters and adjusts charging current in stages, reducing current when temperature rises or charge level increases, thereby maintaining fast charging speed while preventing excessive heating and safety risks
Solution Approach 2:
The patent employs feedback control by continuously monitoring battery temperature, cell voltage, and charge level, then adjusting charging current accordingly. The system uses real-time feedback from battery state sensors to modulate charging power, ensuring fast charging while preventing thermal runaway and lithium precipitation through closed-loop control
3Productivity
If high charging current is applied at low temperature, then the charging efficiency is high, but lithium precipitation occurs
Solution Approach 1:
The patent performs preliminary warming or pre-conditioning of the battery when low temperature is detected before applying high charging current. The system monitors battery temperature and implements preparatory heating or extends the warm-up phase, ensuring the battery reaches a safe temperature threshold before high-current charging begins, thereby preventing lithium precipitation while maintaining charging efficiency
Solution Approach 2:
The patent implements a staged charging approach that skips direct high-current charging at low temperatures. Instead, the system rapidly transitions through a low-current warm-up phase to reach the optimal charging temperature range, then proceeds with efficient high-current charging, effectively skipping the dangerous low-temperature high-current condition that causes lithium precipitation
4Temperature
If prolonged heating is applied, then the battery temperature increases, but the cycle service life is reduced
Solution Approach 1:
The patent maintains continuous monitoring of battery temperature and charge level throughout the charging process, ensuring uninterrupted optimization of charging parameters. The system continuously adjusts charging current to maintain battery temperature within the optimal range, preventing both excessive heating and insufficient charging, thereby extending cycle service life while ensuring complete charging
Data Source
AI summary
A charging method of an energy storage power supply, a charging apparatus therefor, a device and a medium are provided. The charging method includes: obtaining a voltage of each of a plurality of cells in a battery pack of a battery module; and charging the battery module by selecting, based on a minimum voltage among the voltages of the plurality of cells, a corresponding charging scheme. The corresponding charging scheme includes a first charging scheme and a second charging scheme.