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Battery temperature detection

A technology of batteries and detection methods, applied in battery, secondary battery testing, thermometers, etc., can solve problems such as time-consuming

Active Publication Date: 2021-06-04
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

it is time consuming

Method used

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Examples

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example 1

[0119] Example 1: A method comprising: driving an alternating input current having a first frequency into a battery, and detecting the imaginary part of the battery impedance at the first frequency; driving a variable current into the battery, and detecting an imaginary part of the battery impedance at a second frequency; and calculating an intercept frequency based at least on the imaginary part obtained at the first frequency and the imaginary part obtained at the second frequency, the imaginary part being at The cutoff frequency is equal to the predefined value.

example 2

[0120] Example 2: The method according to Example 1, wherein the predefined value is zero.

example 3

[0121] Example 3: The method according to example 1 or 2, wherein the predefined value is not zero.

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Abstract

A method and a temperature detection circuit are disclosed. An example of the method includes: driving an alternating current having a first frequency into the battery, and detecting the imaginary part of the battery impedance at the first frequency; driving an alternating current having a second frequency different from the first frequency driving into the battery, and detecting the imaginary part of the battery impedance at a second frequency; and calculating an intercept frequency based at least on the imaginary part obtained at the first frequency and the imaginary part obtained at the second frequency, the imaginary part being at The cutoff frequency is equal to the predefined value.

Description

technical field [0001] The present disclosure generally relates to detecting the temperature of a battery. In particular, the present disclosure relates to sensorless battery temperature detection. Background technique [0002] Detecting or measuring the temperature of a battery, such as a lithium-ion (Li-ion) battery, may include driving an alternating current with varying frequencies into the battery, measuring the complex impedance of the battery at each frequency of the current in order to detect imaginary variations in the impedance. The frequency at which the impedance part is zero, and the temperature is detected based on the frequency at which the imaginary part of the impedance is zero. This method, known as the ZIF (Zero Intercept Frequency) method, is based on the fact that the imaginary part of the battery impedance depends on temperature in such a way that at a given temperature, the imaginary part of the battery impedance of a certain type of battery Zeros ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/4285H01M10/48H01M10/486G01R31/382G01K7/42G01K2217/00G01R31/389G01R31/3648H01M10/0525H01M2220/20Y02E60/10G01K7/16
Inventor S·玛赛利C·桑德纳J·蒂尔曼
Owner INFINEON TECH AG
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