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Systems and methods for determining a self-discharge current characteristic of a storage cell

A storage unit, self-discharge technology, applied in circuits, measuring electricity, electrical components, etc., to solve problems lasting several weeks or longer, chemical leakage, toxic emissions, etc.

Active Publication Date: 2018-06-29
KEYSIGHT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Understandably, such a process not only provides an approximation of the self-discharge current characteristics of each Li-ion cell, but also suffers from various other disadvantages, such as test cycles that must extend for several weeks or longer, storage requirements (including controlled environment conditions) and potential hazards during storage (fire, chemical spills, toxic emissions, etc.)

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  • Systems and methods for determining a self-discharge current characteristic of a storage cell

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Embodiment Construction

[0015] Throughout this specification, embodiments and modifications have been described for the purpose of illustrating the use and making of the inventive concept. The illustrative description should be understood as presenting an example of the inventive concepts, not as limiting the scope of the concepts disclosed herein. For this reason, certain expressions and terms are used herein for convenience only, and such expressions and terms should be broadly construed to include various terms as generally understood by those of ordinary skill in the art in various forms and equivalents. and action. For example, words such as "memory cell", "charge", "voltage", "processor", "computer", "amplifier", "accuracy", "resolution", "accuracy", "gain", "group", "Collection" or "number" may have various interpretations and may be implemented in various ways without departing from the spirit of the present disclosure. More specifically, the phrase "storage unit" as used herein is not nece...

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Abstract

The invention discloses systems and methods for determining a self-discharge current characteristic of a storage cell. In accordance with one illustrative embodiment, a system for determining a self-discharge current characteristic of a storage cell (or a bank of storage cells) includes a voltage source, first and second voltage measurement circuits, a current measurement circuit, and a processor.The voltage source provides a potentiostat voltage to the storage cell coupled to the system. The first voltage measurement circuit provides a first voltage resolution for measuring an open circuit voltage across a pair of terminals of the storage cell. The second voltage measurement circuit provides a second voltage resolution that is significantly higher than the first voltage resolution for measuring a terminal voltage at one of the pair of terminals of the storage cell. The processor executes a test procedure by using the voltage source, the first and second voltage measurement circuits,and the current measurement circuit, to determine the self-discharge leakage current characteristic of the storage cell.

Description

Background technique [0001] Storage batteries, such as nickel-cadmium (NiCad) batteries or lithium-ion batteries, typically lose their charge over a period of time, primarily due to the self-discharge current that occurs in the storage battery. Unfortunately, considering the state of the art, it is practically impossible to completely eliminate the self-discharge current in these memory cells. Furthermore, while testing individual memory cells in a laboratory environment has limited success, measuring the self-discharge current characteristics of each of a batch of memory cells in a manufacturing environment is rather complex and impractical. [0002] More specifically, measuring the self-discharge current parameter of each of a batch of Li-ion cells during manufacturing is impractical for various reasons. Some of these reasons include disadvantages associated with existing lithium storage battery technology, while others are associated with commercially available potentiosta...

Claims

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Application Information

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IPC IPC(8): G01R31/36
CPCG01R31/385G01R31/396G01R31/374G01R31/52G01R31/3865Y02E60/10G01R31/387G01R31/3648H01M10/48G01R31/3842G01R31/367
Inventor E·布罗林M·乌洛维奇B·博斯维尔R·佐罗
Owner KEYSIGHT TECH
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