Battery electric system with alternating current self-heating mode
US-2024429481-A1 · Dec 26, 2024 · US
Cell temperature and degradation measurement in lithium ion battery systems using cell voltage and pack current measurement and the relation of cell impedance to temperature based on signal given by the power inverter
US8994340B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8994340-B2 |
| Application number | US-201213471803-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 15, 2012 |
| Priority date | May 15, 2012 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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Abstract
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A method and system for determining the temperature of cells in a battery pack, without using temperature sensors, by measuring the impedance of the cells and using the impedance to determine the temperature. An AC voltage signal is applied to the battery pack, and a time sample of voltage and current data is obtained. The voltage and current data is narrowed down to a simultaneous time window of interest, and a fast fourier transformation is performed on the windowed voltage and current data to identify voltage and current magnitudes at one or more specific frequencies. The voltage and current magnitudes are used to determine the impedance at the one or more frequencies. Finally, the impedance is used to determine the temperature of the cell or cells using a look-up table, where the impedance, the frequency, and a state of charge are used as input parameters for the look-up.
First claim
Opening claim text (preview).
What is claimed is: 1. A temperature measurement system for cells in a battery pack, said temperature measurement system comprising: means for applying an alternating current (AC) voltage signal to the battery pack; a voltage sensor for measuring a voltage across a cell group in the battery pack, where the cell group is comprised of one or more cells in parallel, said voltage sensor providing a voltage signal for the cell group; a current sensor for measuring a battery pack cu…
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- H01M10/486Primary
Electricity · mapped topic
Physics · mapped topic
- H02J7/00Primary
Electricity · mapped topic
Physics · mapped topic
Physics · mapped topic
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Frequently asked questions
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- What does patent US8994340B2 cover?
- A method and system for determining the temperature of cells in a battery pack, without using temperature sensors, by measuring the impedance of the cells and using the impedance to determine the temperature. An AC voltage signal is applied to the battery pack, and a time sample of voltage and current data is obtained. The voltage and current data is narrowed down to a simultaneous time window …
- Who is the assignee on this patent?
- Matthe Roland, Humbert Hans-Joachim, Kowalczyk Konrad, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification H01M10/486. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).