Quick Charging Device Switching Unit Battery Module Discharging
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Solution Overview
Problem
Existing quick charging devices for vehicle storage batteries face challenges in efficiently charging multiple battery modules simultaneously, leading to uneven charge distribution and reduced charging speed due to the need for series and parallel connections, which complicates the charging and discharging processes.
Innovation Solution
A quick charging device with a switching unit and controller that connects battery modules in series for charging and individually to a load unit for discharging, while performing an equalizing process to balance charge levels, ensuring all modules are fully charged before stopping the charging process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery modules are connected in series for charging, then charging voltage is increased and charging speed is improved, but charge distribution becomes uneven and some modules become fully charged before others
Solution Approach 1:
The battery system is divided into multiple independent battery modules, each with its own switching unit. This segmentation allows individual control of each module during charging, enabling the system to connect modules in series for high-voltage fast charging while also allowing individual module disconnection to prevent overcharging, thus resolving the contradiction between charging speed and charge distribution uniformity.
Solution Approach 2:
The switching units dynamically adjust the connection state of each battery module based on its charge level. When a module reaches full charge, its switching unit disconnects it from the series circuit, allowing other modules to continue charging. This dynamic adjustment maintains high charging voltage while ensuring uniform charge distribution across all modules.
2Power
If battery modules are connected in parallel for discharging, then current capacity is increased, but control complexity increases and equalizing charge levels becomes difficult
Solution Approach 1:
Each battery module is equipped with an independent switching unit that can individually connect or disconnect the module from the load. This segmentation simplifies control by allowing each module to operate independently during discharging, reducing the overall control complexity while maintaining the ability to provide high current capacity through parallel connection of multiple modules.
Solution Approach 2:
The switching units automatically manage the connection and disconnection of individual battery modules based on their charge levels and the system's power demands. This self-service mechanism eliminates the need for complex centralized control, as each module autonomously regulates its own discharge, thereby reducing control system complexity while maintaining high discharge current capacity.
3Power
If all battery modules are connected to the load during discharging, then power output is maximized, but reliability decreases if one module fails
Solution Approach 1:
The independent switching units for each battery module enable selective connection to the load, creating modular redundancy. If one module fails, its switching unit disconnects it from the circuit, allowing the remaining healthy modules to continue providing power output. This segmentation maintains system reliability while preserving the ability to maximize power output when all modules are functional.
Solution Approach 2:
The switching units are designed to detect and respond to module failures before they propagate through the entire system. By providing individual disconnection capability for each module, the system prepares in advance for potential failures, ensuring that a single module failure does not compromise the entire battery system's reliability or power output capability.
Data Source
AI summary
A quick charging device connects, in a charging operation, a plurality of battery modules in series, and connects the battery modules that are connected in series to a charger, and selects, in a discharging operation, one of the battery modules, and connects the selected battery module to a load unit. When the amount of charge in the battery module connected to the load unit drops by a predetermined amount during the discharging operation, the quick charging device connects another battery module having the largest amount of charge to the load unit.