Battery Charging Rectifier for Safety Isolation
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Solution Overview
Problem
Existing battery charging systems for vehicles and stationary applications face reliability issues due to the need for multiple contactors, which increase costs and risk of safety hazards, especially when dealing with high DC voltages and potential short circuits.
Innovation Solution
Incorporating a rectifying means, such as a diode, to allow charging current flow in one direction while blocking current flow in the opposite direction, thereby eliminating the need for one of the contactors and preventing battery discharge during short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple contactors are used in the battery charging system, then the system can control current flow and provide safety isolation, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the current control function from the mechanical contactor system and implements it through semiconductor switching elements (transistors) integrated into the control circuit. This eliminates the need for multiple heavy-duty contactors while maintaining safety isolation through electronic control and fuse protection.
Solution Approach 2:
The patent replaces the mechanical contactor system with an electronic switching system using transistors and diodes. The mechanical isolation function is substituted by electronic control elements that can rapidly switch current flow while providing equivalent or superior safety through integrated circuit protection.
2Power
If multiple contactors are used to control charging current, then current control is achieved, but the cost of the battery system increases
Solution Approach 1:
The patent substitutes expensive mechanical contactors with cost-effective semiconductor switching elements. The transistor-based electronic switch provides precise current control at a fraction of the cost of multiple heavy-duty contactors, while the integrated circuit design reduces assembly complexity.
Solution Approach 2:
The patent changes the control parameter from mechanical contactor positioning to electronic voltage/current control through transistors. This allows precise current regulation through electronic feedback control, achieving the same power control function at lower cost and with better 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 solution enhances reliability and reduces costs by simplifying the charging process, ensuring safe operation, and preventing battery discharge during short circuits, thus addressing the reliability and safety concerns in battery charging systems.
Implementation Method 1
a first connection of a charging device is connected to a first pole of at least one battery cell by means of a rectifying means. The rectifying means is designed in such a way that a charging current can flow
Data Source
AI summary
The disclosure relates to a method for charging a battery having at least one battery cell. A first connection of a charging device is connected to a first pole of the at least one battery cell by a rectifying device. The rectifying device is set up such that charging current can flow. The disclosure further relates to a charging device, a battery, and a motor vehicle, which are configured to carried out the method.