Secondary battery degradation state estimation method, degradation state estimation device, control method, and control system
US-2019361076-A1 · Nov 28, 2019 · US
Battery system
US11881567B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11881567-B2 |
| Application number | US-202117329444-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 25, 2021 |
| Priority date | Jun 12, 2020 |
| Publication date | Jan 23, 2024 |
| Grant date | Jan 23, 2024 |
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- Title
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Abstract
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A battery system avoids an over discharge with a simple sensor element is provided. The battery system comprises: a battery pack including a plurality of battery cells connected in series, a monitoring unit that monitors a condition of the battery pack, and a control unit that controls a discharge of the battery pack. The control unit calculates capacity condition A of the battery pack at a first discharge cutoff voltage based on the total voltage and the total current, estimates capacity condition B of the battery pack at the first discharge cutoff voltage based on the total current and the temperature, determines an occurrence of an over discharge based on the capacity condition A and the capacity condition B, changes the first discharge cutoff voltage to a second discharge cutoff voltage that is higher than the first discharge cutoff voltage, when the occurrence of the over discharge is determined.
First claim
Opening claim text (preview).
What is claimed is: 1. A battery system comprising: a battery pack including a plurality of battery cells connected in series, a monitoring unit configured to monitor a condition of the battery pack, and a control unit configured to control at least a discharge of the battery pack, and the monitoring unit includes: a voltage sensor configured to measure a total voltage of the battery pack, a current sensor configured to measure a total current of the battery pack, and a temperature sensor configured to measure a temperature of the battery pack, the control unit includes: a calculating section configured to calculate capacity condition A of the battery pack at a first discharge cutoff voltage based on the total voltage and the total current, an estimating section configured to estimate capacity condition B of the battery pack at the first discharge cutoff voltage based on the total current and the temperature, a determining section configured to determine an occurrence of an over discharge based on the capacity condition A and the capacity condition B, and a voltage changing section configured to change the first discharge cutoff voltage to a second discharge cutoff voltage that is higher than the first discharge cutoff voltage, when the occurrence of the over discharge is determined. 2. The battery system according to claim 1 , wherein the voltage changing section specifies capacity condition C corresponding to voltage a in an estimated discharge curve of an over discharged cell, specifies voltage β corresponding to the capacity condition C in an actually measured discharge curve of the battery pack, and sets the second discharge cutoff voltage based on the voltage β. 3. The battery system according to claim 2 , wherein the voltage α is a voltage of 0 V or more. 4. The battery system according to claim 1 , wherein the monitoring unit includes no voltage sensor configured to measure a voltage of the battery cells individually.
Assignees
Inventors
Classifications
Sequential battery discharge in systems with a plurality of batteries · CPC title
Control of state of charge [SOC] · CPC title
against overdischarge · CPC title
- H01M10/482Primary
for several batteries or cells simultaneously or sequentially · CPC title
involving only voltage measurements · CPC title
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- What does patent US11881567B2 cover?
- A battery system avoids an over discharge with a simple sensor element is provided. The battery system comprises: a battery pack including a plurality of battery cells connected in series, a monitoring unit that monitors a condition of the battery pack, and a control unit that controls a discharge of the battery pack. The control unit calculates capacity condition A of the battery pack at a fir…
- Who is the assignee on this patent?
- Toyota Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M10/482. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 23 2024 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 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).