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Device and method for battery impedance measurement

A battery impedance, battery technology, applied in the direction of measuring resistance/reactance/impedance, measuring electricity, measuring devices, etc., can solve problems such as hot spots and temperature changes, negative effects of measurement accuracy, etc.

Pending Publication Date: 2020-05-05
INFINEON TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This can lead to hot spots and temperature changes of the measuring device during the measurement, which can negatively affect the measurement accuracy

Method used

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  • Device and method for battery impedance measurement
  • Device and method for battery impedance measurement
  • Device and method for battery impedance measurement

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0099] Example 1. An apparatus for battery impedance measurement comprising:

[0100] a first terminal configured to be connected to a battery;

[0101] a second terminal configured to connect to an energy storage device;

[0102] a switched capacitor network coupled between the first terminal and the second terminal;

[0103] a controller configured to operate the switched capacitor network to cause alternating current to flow between the battery and the energy storage device; and

[0104] A measurement circuit configured to measure the alternating current flowing into or out of the battery and the voltage across the battery.

[0105] Example 2. The device of example 1, wherein the controller is further configured to determine a battery impedance of the battery based on the measured alternating current and the voltage across the battery.

example 3

[0106] Example 3. The apparatus of examples 1 or 2, wherein the controller is configured to operate the switched capacitor network such that the alternating current has a rectangular waveform.

[0107] Example 4. The device of any of examples 1-3, wherein the controller is further configured such that: during the first part of the cycle of the alternating current, current flows from the battery to the energy storage device, and during the second part of the cycle, Electricity flows from the energy storage device to the battery.

[0108] Example 5. The apparatus of example 4, wherein the controller is further configured to: control the switched capacitor network to repeatedly change between the first switching configuration and the second switching configuration in the first part of the cycle, and in the second part of the cycle repeatedly changing between the third switching configuration and the fourth switching configuration.

[0109] Example 6. The apparatus of any of exam...

example 12

[0138] Example 12. The apparatus of any of examples 1-11, further comprising an energy storage device, wherein the energy storage device includes at least one of a capacitor or a coil.

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Abstract

Devices and methods for impedance measurements are provided. A switched capacitor network (15) is operated to cause an alternating current to flow between a battery (13) and an energy storage (14), and the alternating current and a voltage across the battery (13) are measured.

Description

technical field [0001] The present application relates to devices and methods for battery impedance measurement. Background technique [0002] Battery impedance can provide information about the battery, such as temperature, state of charge, or state of health (eg, degradation due to aging). Measurement of such impedance of a battery can be performed, for example, in an electric vehicle in order to obtain information about the battery powering the electric vehicle. [0003] This impedance measurement is typically performed by injecting a sinusoidal current (positive (i.e., current into the battery) or negative (i.e., current out of the battery)) into the battery, and simultaneously measuring the injected current and the battery voltage response to the injected current . The measured time-varying voltage and current are then post-processed, which includes forming a ratio between voltage and time that gives the complex impedance of the battery at the frequency of the sinusoi...

Claims

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Application Information

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IPC IPC(8): G01R31/389G01R27/08B60L58/10
CPCG01R31/389G01R27/08B60L58/10G01R31/3842G01R31/396G01R31/3644
Inventor S·玛赛利K·霍玛尔A·米斯拉F·罗赛蒂
Owner INFINEON TECH AG
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