High-voltage on-board power system for electrically driven vehicles

By designing two independent sub-grids in electric vehicles, the redundancy and electromagnetic compatibility issues of high-voltage on-board grids in existing technologies are solved, achieving efficient voltage regulation and redundant power supply, reducing the risk of vehicle breakdown, and supporting autonomous driving.

CN122249336APending Publication Date: 2026-06-19MERCEDES BENZ GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MERCEDES BENZ GRP
Filing Date
2024-11-14
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The on-board power grid of existing electric vehicles lacks redundancy design in the high-voltage system, resulting in a high risk of vehicle breakdown and a lack of redundancy in autonomous driving. In addition, the inverter is inefficient at low loads and has high electromagnetic compatibility requirements.

Method used

It employs at least two independent sub-grids, each with its own high-voltage battery, electric drive unit, and auxiliary assembly. Energy transfer and voltage regulation are achieved through an on-board charger to reduce the risk of breakdowns, and redundant low-voltage power supply is provided through a DC-DC converter.

Benefits of technology

It achieves redundant design of high-voltage vehicle-mounted power grid, reduces the risk of vehicle breakdown, supports autonomous driving, improves inverter efficiency under low load, reduces electromagnetic compatibility requirements, and provides more capacitor freedom.

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Abstract

This invention relates to a high-voltage on-board electrical network (1) for an electric vehicle, comprising at least one high-voltage battery (2, 2.1, 2.2), at least one electric drive unit (3, 4), and a plurality of auxiliary assemblies (5 to 9), wherein at least one charging interface for DC charging of the high-voltage batteries (2, 2.1, 2.2) and an on-board charger (11) for AC charging of the high-voltage batteries (2, 2.1, 2.2) are arranged, wherein the high-voltage on-board electrical network (1) has at least two mutually separate sub-grids (1.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 ... 1.2), each of these sub-grids has its own high-voltage battery (2.1, 2.2), wherein these sub-grids (1.1, 1.2) are electrically connected to each other via an on-board charger (11) having a DC-DC converter (11.1) and being able to transfer energy between these sub-grids (1.1, 1.2) via the DC-DC converter (11.1), wherein the at least one electric drive unit (3, 4) and the plurality of auxiliary assemblies (5 to 9) are fixedly distributed to the two sub-grids (1.1, 1.2).
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