Nonaqueous electrolyte secondary battery and manufacturing method therefor
US-2017309953-A1 · Oct 26, 2017 · US
Method of screening high rate electrochemical cells
US11041912B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11041912-B2 |
| Application number | US-202016839045-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 2, 2020 |
| Priority date | Nov 18, 2016 |
| Publication date | Jun 22, 2021 |
| Grant date | Jun 22, 2021 |
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- Title
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Abstract
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A method of screening a battery for failure mechanisms is provided. The method may include activating an electrochemical cell. Within 5 minutes to two hours of activating the cell, the open circuit voltage of the cell is measured over a period of time to determine a voltage versus time function. The cell is then screened for the presence of a failure mechanism by checking the voltage versus time function for a failure criteria.
First claim
Opening claim text (preview).
What is claimed is: 1. A method comprising: measuring the open circuit voltage of an activated electrochemical cell over a period of time to determine a voltage versus time function, the voltage versus time function resulting from at least 100 open circuit voltage measurements taken between activating the cell and 24 hours after activating the cell; and screening the cell for the presence of a failure mechanism by checking the voltage versus time function for a failure criteria, the failure mechanism being a mechanism by which the cell can fail after the screening. 2. The method of claim 1 , wherein the voltage versus time function includes multiple open circuit voltage measurements taken between activating the cell and screening the cell. 3. The method of claim 2 , wherein the voltage measurements start within 5 minutes of activating the cell. 4. The method of claim 1 , wherein the failure mechanism is a mechanism that causes cells to short due to the presence of contaminants in the cell. 5. The method of claim 1 , wherein checking the voltage versus time function for the failure criteria further comprises calculating and filtering a first derivative of the voltage versus time function. 6. The method of claim 1 , wherein checking the voltage versus time function for the failure criteria further comprises filtering a second derivative of the voltage versus time function using a linear time invariant filter. 7. The method of claim 6 , wherein the failure criteria is met where the absolute value of the filtered second derivative exceeds 0.15 V/sec 2 at any point in time. 8. The method of claim 1 , wherein adding an electrolyte to the electrochemical cell activates the electrochemical cell.
Assignees
Inventors
Classifications
- G01R31/3865Primary
related to manufacture, e.g. testing after manufacture · CPC title
- G01R31/385Primary
Arrangements for measuring battery or accumulator variables (for monitoring G01R31/382) · CPC title
comprising digital calculation means, e.g. for performing an algorithm · CPC title
Determining battery ageing or deterioration, e.g. state of health · CPC title
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- What does patent US11041912B2 cover?
- A method of screening a battery for failure mechanisms is provided. The method may include activating an electrochemical cell. Within 5 minutes to two hours of activating the cell, the open circuit voltage of the cell is measured over a period of time to determine a voltage versus time function. The cell is then screened for the presence of a failure mechanism by checking the voltage versus tim…
- Who is the assignee on this patent?
- Pacesetter Inc
- What technology area does this patent fall under?
- Primary CPC classification G01R31/3865. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jun 22 2021 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).