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Method for Determining the Functional Safety of Low-Voltage Batteries

A low-voltage battery, safety technology, applied in current collectors, measuring electricity, electrical devices, etc., can solve problems such as insufficient battery function realization

Active Publication Date: 2022-02-08
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] A disadvantage of the known prior art is that with the disclosed method it is only possible to determine the functional realization of the battery insufficiently

Method used

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  • Method for Determining the Functional Safety of Low-Voltage Batteries
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  • Method for Determining the Functional Safety of Low-Voltage Batteries

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Embodiment Construction

[0030] figure 1 A possible device with which the method according to the invention can be applied is shown. The energy supply, low voltage battery 2 , of an electric vehicle (not shown) is shown by means of a HV battery 1 and a NV battery 2 supplying the vehicle's NV on-board network 3 . Batteries 1, 2 may be lead storage batteries, lithium storage batteries or other suitable batteries. Usually, the vehicle-mounted network of a common car is designed to be 12V, while the vehicle-mounted network of a traditional truck is designed to be 24V. However, other vehicle network voltages in the NV range, for example 12V to 60V, may also be used. In order to apply a test pulse to the NV battery 2, a switch 4 is provided, which connects the NV battery 2 with a DC / DC converter 5 and is responsible for feeding power back into the HV battery 1 in boost operation (arrow 6) . Once the switch 4 is closed, a test pulse is applied to the NV battery 2 and the voltage across the battery is mea...

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Abstract

The invention relates to a method for determining the functional safety of a low-voltage battery (NV battery) of an at least partially electrically driven vehicle, to which a test pulse is applied. In order to propose a method that enables a functional check in a simple manner, which shows that the battery meets a predefinable load scenario and does not fall below a temperature-independent lower voltage limit, it is proposed to The functional safety of the battery results from the correlation of the voltage curve of the battery with the predetermined functional requirements, wherein the battery is functionally safe if the voltage curve of the battery during the test pulse satisfies a plurality of independent test criteria.

Description

technical field [0001] The invention relates to a method for determining the functional safety of a low-voltage battery (NV battery) of an at least partially electrically driven vehicle, wherein test pulses are applied to the battery. Background technique [0002] A conventional engine-driven vehicle has an engine and a generator (Generator) that is driven by the engine and provides electric energy for the vehicle. It also drives safety-relevant systems such as brake booster, power steering, ESP and lighting. Furthermore, such vehicles have a low-voltage battery, which is charged by the generator and also assumes certain functions of the power supply, such as the radio or the window regulators, even when the engine is switched off and thus the generator is switched off. In the event that the generator fails due to a fault and is no longer able to supply the vehicle with electrical energy, the low-voltage battery assumes the electrical supply of the vehicle as a whole, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/382B60L3/12B60L1/00
CPCB60L1/00B60L3/12G01R31/3835G01R31/3647
Inventor T.克雷姆瑟M.霍拉斯M.内伯尔西克W.索克
Owner VOLKSWAGEN AG