Series Battery Charging Circuit Without Current Interruption
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Solution Overview
Problem
Charging and discharging multiple secondary batteries in series poses challenges due to capacity differences, leading to current interruptions and measurement errors, which increase equipment and operation costs, and pose safety risks.
Innovation Solution
A series-type charging and discharging method and apparatus using a bi-directional main power supply with auxiliary power supplies in parallel to correct capacity differences, configured as insulated unidirectional DC-to-DC converters, to maintain continuous charging and discharging without current interruptions, and featuring real-time voltage monitoring for safety and calibration of current sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple secondary batteries are charged and discharged in series using one main power supply, then equipment costs are reduced, but capacity differences between batteries cause current interruptions and measurement errors
Solution Approach 1:
The system divides the charging and discharging function into two parts: the main power supply handles series connection and overall charging/discharging, while auxiliary power supplies are added in parallel to individual batteries to handle capacity differences. This segmentation allows each component to focus on a specific function, resolving the contradiction between using one main power supply and maintaining process continuity.
Solution Approach 2:
Auxiliary power supplies act as intermediaries between the main power supply and individual batteries. When a battery completes charging or discharging first, the auxiliary power supply compensates by providing or absorbing current, preventing current interruption in the main circuit and eliminating measurement errors while maintaining the benefit of using one main power supply.
2Ease of operation
If relay switches are used to connect or separate batteries from the circuit, then individual battery control is achieved, but current interruption occurs at the moment of relay operation
Solution Approach 1:
The auxiliary power supply serves as an intermediary that maintains current flow in the main circuit during relay switching operations. When a relay switches a battery in or out, the auxiliary power supply compensates for the current change, ensuring continuous current flow and preventing measurement errors, while still allowing individual battery control through the relay.
Solution Approach 2:
The system dynamically changes the current parameter by introducing auxiliary current through the auxiliary power supply. This compensates for current interruptions caused by relay switching, maintaining measurement precision while preserving the ease of operation provided by relay-controlled battery connection and separation.
3Measurement precision
If high specification sensors are used to maintain high precision and resolution, then measurement accuracy is improved, but equipment cost increases
Solution Approach 1:
The auxiliary power supply acts as an intermediary that stabilizes current and voltage parameters during battery switching operations. This creates a more stable measurement environment, allowing the use of lower specification sensors while maintaining measurement accuracy, thereby reducing equipment cost while preserving measurement precision.
Solution Approach 2:
By dynamically adjusting current parameters through the auxiliary power supply, the system maintains stable electrical parameters during relay operations. This parameter stabilization reduces measurement errors, allowing the use of less expensive sensors while maintaining the required measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces equipment and operation costs, enhances power conversion efficiency, minimizes power loss, and improves safety by preventing accidents through real-time monitoring and easy program updates, while maintaining high precision in charging and discharging processes.
Implementation Method 1
The auxiliary charging power supply for the individual battery is an insulated unidirectional DC-to-DC converter
Implementation Method 2
a plurality of secondary batteries connected in series are charged and discharged using one bi-directional main charging and discharging power supply
Data Source
AI summary
The present disclosure relates to a method and an apparatus for charging and discharging a plurality of secondary batteries connected in series by using one bi-directional main charging and discharging power supply, and more particularly, to a series-type charging and discharging method and apparatus without current interruption in which auxiliary charging power supplies are added in parallel to individual batteries to reduce a capacity difference between the individual batteries and perform continuous charging and discharging according to a predetermined recipe (electrical conditions for charging and discharging, etc.) without interruption (on/off) of a charging and discharging current of the main charging and discharging power supply.