A lithium-ion battery online safety warning method

A lithium-ion battery, safety warning technology, applied in secondary battery repair/maintenance, secondary battery charging/discharging, measuring electricity, etc., can solve battery thermal runaway, can not predict battery safety hazards well, can not be effective Prevent battery safety accidents and other issues to achieve the effect of preventing safety accidents, accurate and efficient early warning, and simple and easy methods

Active Publication Date: 2019-03-08
STATE GRID CORP OF CHINA +2
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

These methods reduce the risk of using lithium-ion batteries to a certain extent, but because battery safety accidents are usually from the inside out, that is, problems occur inside the battery, causing thermal runaway of the battery, and the current safety measures are not very good. Reflecting the internal situation of the battery, it is impossible to predict the possible safety hazards of the battery; at the same time, most of the battery safety accidents occur during use, and this kind of regular inspection and maintenance cannot effectively prevent battery safety accidents. occur

Method used

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  • A lithium-ion battery online safety warning method
  • A lithium-ion battery online safety warning method

Examples

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Embodiment 1

[0038] Such as Figure 1-2 As shown, the invention of this example provides an online safety warning method for lithium-ion batteries. During the operation of lithium-ion batteries, the voltage, current and temperature of the battery are mainly collected. The temperature measures the temperature on the surface of the battery and cannot accurately reflect the internal conditions of the battery. The voltage of the battery has two situations, one is the voltage of the battery in the static state, the other is the voltage of the battery in operation and its changes, the voltage in the static state can provide very little information, but the voltage in the operation process The voltage and its changes can provide more information, which can reflect the capacity and internal resistance of the battery at the same time. In a certain period of time, the voltage change value of the lithium-ion battery changes with the current or power loaded on the battery, and, as the capacity of the...

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Abstract

The invention relates to an online safety pre-warning method for a lithium-ion battery. The method comprises the following steps: determining an impact condition of the lithium-ion battery; determining a voltage change threshold of the battery; and carrying out online safety pre-warning of the battery. According to the method, the single battery with a potential safety hazard can be separated out by intercepting a voltage change value of the lithium-ion battery under a current or power impact condition within a certain period and carrying out transverse and longitudinal comparison on the numerical value, so that online safety pre-warning of the lithium-ion battery is achieved. Transverse comparison is carried out between different single batteries; and longitudinal comparison is numerical value comparison of various single batteries between different running time nodes.

Description

Technical field: [0001] The invention relates to an online safety warning method for a battery, and more particularly relates to an online safety warning method for a lithium ion battery. Background technique: [0002] Clean renewable energy such as wind energy and solar energy has been widely used, but due to its intermittent and discontinuous nature, energy storage technology is needed to improve the continuity and stability of energy supply. Lithium-ion batteries have shown great application potential in the field of energy storage due to their advantages such as high energy density, good power characteristics, long cycle life, good environmental adaptability, and no memory effect. But lithium-ion batteries are an energy carrier after all. During use, due to improper use (overcharge, overdischarge, short circuit, etc.) or harsh use conditions (high temperature, low temperature, high current, high power), the battery may be damaged. The thermal runaway of lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/42H01M10/44G01R31/385
CPCY02E60/10
Inventor 刘家亮范茂松官亦标王绥军傅凯金翼
Owner STATE GRID CORP OF CHINA
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