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Electrochemical lithium precipitation analysis method and module device thereof

An analysis method and electrochemical technology, applied in the direction of material analysis, measuring devices, and analysis materials through electromagnetic means, can solve the problems of manpower and material resources, low efficiency of lithium analysis, toxic and harmful detection sensitivity, etc., to avoid manpower and material resources , large application prospects and social benefits

Active Publication Date: 2019-06-21
欣旺达惠州动力新能源有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide an electrochemical lithium analysis method and its module device, aiming to solve the problems of low efficiency, manpower and material resources, poisonous and harmful, low detection sensitivity and incapable of quantitative analysis of lithium analysis in the prior art The problem

Method used

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  • Electrochemical lithium precipitation analysis method and module device thereof
  • Electrochemical lithium precipitation analysis method and module device thereof
  • Electrochemical lithium precipitation analysis method and module device thereof

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Embodiment 1

[0042] refer to figure 1 , the embodiment of the present invention proposes an electrochemical lithium analysis method, comprising the following steps:

[0043] S1, specify charging mode and collect voltage, time, current, capacity data. Among them, charging in the specified mode is: charging the lithium-ion battery to a certain voltage or to a certain state of charge (SOC) at a certain temperature and at a certain current under constant current or constant current and constant voltage.

[0044] S2, standing still and collecting voltage and time data.

[0045] S3, analyzing the second-order differential relationship between voltage and time during the standing period.

[0046] S4, if the voltage-time curve collected in S3 is analyzed, and the second-order differential value of the voltage versus time does not appear to be less than zero at the initial stage of standing, it is determined that lithium is not separated.

[0047] S5, if the voltage-time curve collected in S3 is a...

Embodiment 2

[0068] refer to Figure 7 , the present invention provides a modular device based on the electrochemical lithium analysis method proposed above, including:

[0069] The first command unit is used to command the conditions and result output form of lithium analysis detection;

[0070] a first obtaining unit, configured to obtain the instruction;

[0071] The second acquisition unit is used to acquire the voltage, time, current, and capacity data of the charging process, and the voltage and time data of the resting process;

[0072] A third acquisition unit, configured to acquire a relationship curve between voltage and time during the standing process, and acquire the relationship between the second order differential of voltage versus time and time;

[0073] The judging unit is used for judging whether the battery has undergone lithium deposition according to the change of the second-order differential value of the voltage versus time, and gives an output result of "lithium ...

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Abstract

The invention provides an analysis method for electrochemical detection of lithium precipitation and a corresponding module device thereof, and the method comprises the following steps: charging a to-be-detected battery, then carrying out standing treatment, and collecting an electrochemical signal of the battery; characterizing whether the sample battery generates lithium precipitation or not inthe previous charging process by analyzing the collected electrochemical signal, and grading the lithium precipitation degree of the sample battery; and if the semi-quantitative analysis needs to be carried out, carrying out discharge treatment on the lithium-separated battery and collecting an electrochemical signal. The battery semi-quantitative lithium precipitation amount is obtained by analyzing the discharge and the previous charge electrochemical signal. According to the method, the defects of complicated operation, low precision, toxicity, harm and the like of the traditional method for analyzing lithium precipitation by disassembling the battery are overcome, and the lithium precipitation of the battery is quickly, accurately and quantitatively analyzed by utilizing an electrochemical means and a modular device.

Description

technical field [0001] The invention relates to the field of battery new energy technology, in particular to an electrochemical lithium analysis method and a module device thereof. Background technique [0002] The deposition of metallic lithium, also known as lithium precipitation, is the main cause of performance degradation of lithium-ion batteries. It will lead to irreversible capacity loss and internal short circuit, and even bring safety problems such as thermal runaway and combustion. Therefore, in the design and evaluation of battery performance, the lithium release window is regarded as an indispensable parameter. [0003] However, most of the current methods for evaluating the lithium analysis window are to disassemble the battery to observe the state of the pole piece, so as to evaluate the size of the lithium analysis window. The disadvantages of this method are very obvious: the battery is destructively operated, time-consuming, requiring large manpower, mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
Inventor 刘鹏褶春波张耀
Owner 欣旺达惠州动力新能源有限公司
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