Method for determining the aging state of battery cells by means of impedance spectroscopy

A battery cell and aging state technology, applied in the direction of material impedance, electrical components, secondary batteries, etc., can solve the problems of insufficient battery cells, unreliable prediction of battery cell service life, insufficient estimation of battery cell aging state, etc. Achieve the effect of saving test time

Inactive Publication Date: 2011-12-21
ROBERT BOSCH GMBH
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Problems solved by technology

However, these traditional methods only provide insufficient knowledge about the state of the tested battery cell
The state of aging of battery cells has hitherto been only insufficiently estimated with the aid of these conventional methods
Therefore, the service life of battery cells cannot be predicted unreliably

Method used

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  • Method for determining the aging state of battery cells by means of impedance spectroscopy
  • Method for determining the aging state of battery cells by means of impedance spectroscopy
  • Method for determining the aging state of battery cells by means of impedance spectroscopy

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Embodiment Construction

[0045] According to the invention, the determination of the aging state and the prediction of the service life are carried out by means of impedance spectroscopy. It has been shown here that the aging of a battery cell can be detected mainly by two signs, which are illustrated here by way of example with a lithium-ion battery in our measurement sequence.

[0046] 1) Increased impedance in the low frequency range

[0047] The increasing state of aging of these cells is manifested by an impedance increase mainly in the low frequency range (see FIG. 2 ). The increase in impedance is basically independent of the aging duration, but depends on all relevant factors contributing to aging, such as SOC (state of charge: state of charge) and temperature. Thus, the impedance increase can be used for aging state identification and especially for service life prediction.

[0048] 2) Formation of the second RC network in impedance spectroscopy

[0049] In addition to the impedance increa...

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Abstract

The invention relates to a method for determining an aging condition of a battery cell. The method has the following steps of a) providing a battery cell, b) recording an impedance spectrum of the battery cell, c) determining an evaluation quantity based on the measured impedance spectrum, and d) determining an aging condition of the battery cell based on a comparison of the evaluation quantity to a reference value.

Description

Background technique [0001] When evaluating a battery cell, it is necessary to determine the state of aging of the battery cell and, if necessary, to make a prediction about the expected remaining service life. These instructions mainly play an important role in the evaluation of battery cells to be newly qualified. Especially when determining the SOH (state of health) of a battery and when operating a battery management system, for example in a vehicle, a rapid evaluation of the battery cells with respect to their state of aging and / or service life is required. [0002] Heretofore, as a method for this, direct current resistance or battery cell capacity is measured. However, these traditional methods provide only insufficient knowledge about the state of the tested battery cell. The state of aging of the battery cells has hitherto been only insufficiently estimated by means of these conventional methods. Therefore, the lifetime of a battery cell cannot be predicted unrelia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/48
CPCG01R31/3679H01M10/48G01R31/3662Y02E60/12G01R31/392G01R31/389Y02E60/10G01R27/02G01N27/02G01R23/16G01R23/005B60R16/033
Inventor J·齐格勒M·滕策E·克劳斯M·H·柯尼希斯曼
Owner ROBERT BOSCH GMBH
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