Coupling Unit Selective Battery Switching
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Solution Overview
Problem
Existing on-board electrical systems for motor vehicles face challenges in efficiently managing voltage transitions between low-voltage and high-voltage subsystems, leading to potential interruptions and inefficiencies in energy supply, particularly in hybrid and electric vehicles.
Innovation Solution
A method involving a coupling unit that selectively connects and disconnects battery units between low-voltage and high-voltage electrical subsystems without interrupting energy supply, using reverse and forward blocking enabled switches to ensure uninterrupted power delivery and optimize energy transfer, allowing for the use of lithium ion batteries and supercapacitors to support high-power loads and cold-start operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If battery units are switched between low-voltage and high-voltage electrical subsystems, then energy supply efficiency is improved, but interruptions in energy supply may occur
Solution Approach 1:
The coupling unit is configured to pre-establish connection paths and ensure that switching operations between battery units are performed in a manner that maintains continuous energy supply. The system prepares the electrical pathways in advance to prevent interruptions during voltage transitions.
Solution Approach 2:
The coupling unit acts as an intermediary device between the battery units and the electrical subsystems, managing the switching operations and ensuring smooth transitions without causing interruptions to the energy supply to the electrical loads.
2Quantity of substance
If multiple battery units are used in the high-voltage electrical subsystem, then energy storage capacity is improved, but device complexity increases
Solution Approach 1:
The battery system is divided into multiple modular battery units that can be independently managed and switched. Each battery unit can be selectively connected to the high-voltage electrical subsystem through the coupling unit, allowing flexible configuration and management of energy storage capacity.
Solution Approach 2:
The coupling unit is designed to handle multiple functions: it manages switching between different battery units, handles voltage transitions between low-voltage and high-voltage subsystems, and ensures continuous energy supply. This multi-functional design reduces overall system complexity despite using multiple battery units.
Data Source
AI summary
The invention relates to a method for operating an on-board electrical system (1) for a motor vehicle, wherein the on-board electrical system (1) has a low-voltage electrical subsystem (21) with at least one low-voltage load (29) and a starter (26), and has a high-voltage electrical subsystem (20) having at least one high-voltage load (25) and one electrical generator (23), wherein the high-voltage electrical subsystem (20) is connected to the low-voltage electrical subsystem (21) by means of a coupling unit (33) which is designed to draw energy from the high-voltage electrical subsystem (20) and to supply energy to the low-voltage electrical subsystem (21), wherein the high-voltage electrical subsystem (20) has a battery (40) which is designed to generate the high voltage and output said high voltage to the high-voltage electrical subsystem (20), and which has at least two battery units (41-1, 41-2, . . . , 41-n) with line sections (80-11, 80-12, . . . , 80-n2) which are routed to the coupling unit (33). In this case, the coupling unit (33) is designed to selectively connect the battery units (41-1, 41-2, . . . , 41-n) to the low-voltage electrical subsystem (21). The invention also relates to a motor vehicle comprising an internal combustion engine and an on-board electrical system (1) of this kind.