Method and control device for determining state of charge of at least one battery cell on basis of impedance, and motor vehicle

A battery cell, state of charge technology, applied in the direction of battery/fuel cell control devices, battery circuit devices, control devices, etc., can solve the problems of high hysteresis and difficult realization, and achieve the effect of accurate state of charge

Pending Publication Date: 2022-04-19
AUDI AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of lithium iron phosphate batteries, on the one hand this stable voltage-state-of-charge-characteristic curve is very flat and on the other hand has a high hysteresis
Therefore, it is not easy to determine the state of charge based on the voltage, especially the open circuit voltage

Method used

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  • Method and control device for determining state of charge of at least one battery cell on basis of impedance, and motor vehicle
  • Method and control device for determining state of charge of at least one battery cell on basis of impedance, and motor vehicle
  • Method and control device for determining state of charge of at least one battery cell on basis of impedance, and motor vehicle

Examples

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Embodiment Construction

[0045] figure 1 An exemplary circuit 2 is shown. In this example, circuit 2 is part of a motor vehicle. In the present case, the circuit 2 is designed to supply electrical energy to electrical components of the motor vehicle. Motor vehicles are in particular electric vehicles, such as battery-electric vehicles, hybrid vehicles (internal combustion engine and electric motor coupled in parallel or in series) or hydrogen-electric vehicles. In the present case, the electrical circuit 2 is used to supply electrical energy to an electric machine 11 or an electric motor 11 for driving the motor vehicle. For this purpose, the circuit 2 can be designed as a high-voltage circuit.

[0046] The traction battery 9 arranged in the circuit 2 is therefore designed to supply the electric machine 11 with electrical energy via the circuit 2 . The traction battery 9 is preferably designed as a high-voltage battery. Therefore, traction battery 9 in particular has a voltage level of at least 8...

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Abstract

The invention relates to a method for determining the state of charge of at least one battery cell (1), having the following steps that the determination of the state of charge of lithium iron phosphate cells can be improved:-generating alternating current pulses in an electrical circuit (2) connected to the at least one battery cell (1); determining an impedance of the at least one battery cell (1) on the basis of the alternating current pulse; determining the state of charge by comparing the impedance with predefined characteristic curve data, the correlation between the state of charge and the impedance of the at least one battery cell (1) being determined from the predefined characteristic curve data.

Description

technical field [0001] The present invention relates to a method for determining the state of charge of at least one battery cell / cell, wherein in the method alternating current pulses are generated in a circuit connected to the battery cells and based on the alternating current pulses the state of charge of the battery cell is determined impedance. The invention also relates to a corresponding control device and a motor vehicle having such a control device. Background technique [0002] Electric vehicles, such as battery-electric vehicles, hybrid vehicles (combustion engine and electric machine connected in parallel or in series) or hydrogen-electric vehicles, require electrical energy stores, in particular so-called power batteries, for storing or temporarily storing electrical energy. Here, the prior art uses lithium-ion batteries. A major limiting factor for the popularization of electric vehicles is the high cost share of electrical energy storage devices. Lithium ir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/4207H01M10/4257H01M10/482G01R31/389G01R31/367G01R31/374B60L2260/44B60L2240/549B60L58/12B60L3/12G01R31/392G01R31/006
Inventor D·卡林R·诺曼C·勒廷格
Owner AUDI AG
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