Method for quantitatively determining flatness of battery cell

A flatness and cell technology, applied in the direction of circuits, measuring devices, electrical components, etc., can solve the problems of unquantifiable cell flatness, limited application, expensive equipment, etc., to reduce the flatness value, measure Accurate results and improved energy density

Active Publication Date: 2021-04-16
TIANJIN ENERGIES
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  • Claims
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Problems solved by technology

The naked eye observation method is commonly known as the visual inspection method, which uses visible light to observe the surface state of the battery cell. It is a rough and non-quantifiable observation method. Although visible light observation is fast, it cannot quantitatively give the difference in the flatness of the battery

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  • Method for quantitatively determining flatness of battery cell
  • Method for quantitatively determining flatness of battery cell
  • Method for quantitatively determining flatness of battery cell

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Embodiment Construction

[0031] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...

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Abstract

The invention provides a method for quantitatively determining the flatness of a battery cell, which belongs to the technical field of measurement of the flatness of the battery cell of a lithium ion battery, and comprises the following steps that S1, the battery cell to be measured is put on a test board of a measuring tool, and the measuring tool is started; S2, the measuring end of the measuring tool is in contact with the battery cell and extrudes the battery cell, the minimum pressure is 20 Kgf, a first battery cell thickness value f(1) is obtained under the minimum pressure, the pressure of the measuring tool is gradually increased for multiple measurements, the single pressure is increased by 30 Kgf, the thickness change rate K(n) is obtained according to the formula K(n)=1-f(n)/f(n-1), the variable quantity G(n) of the thickness change rate is obtained according to the formula G(n)=K(n)-K(n-1); and S3, the variation G(n) of the thickness change rate is subtracted from the battery cell thickness value f(1) measured for the first time to obtain a cell thickness value measured when the variation G(n) of the thickness change rate is a negative value for the first time to obtain a flatness numerical value. The method is simple to operate and accurate in measurement result, the flatness of the battery cell is quantitatively determined under the condition of meeting low-cost measurement conditions, and engineering technicians can be better helped to research the assembly characteristics of the soft package battery.

Description

technical field [0001] The invention belongs to the technical field of cell flatness measurement for lithium ion batteries, and relates to a method for quantitatively determining the cell flatness. Background technique [0002] In the prior art, the methods for measuring the flatness of the pouch cell are mainly visual observation or laser scanning. The naked eye observation method is commonly known as the visual inspection method, which uses visible light to observe the surface state of the battery cell. It is a rough and non-quantifiable observation method. Although visible light observation is fast, it cannot quantitatively give the difference in the flatness of the battery cell. The laser scanning method is to use optical equipment to scan the entire outline of the cell to make a 3D model, and then calculate the difference between the overall thickness value and the thickness value of the section. Although it can be measured quantitatively, the equipment is expensive and...

Claims

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Application Information

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IPC IPC(8): G01B21/30H01M10/0525
CPCY02E60/10
Inventor 暴旭任正鑫郑彦俊马华刘峰王驰伟
Owner TIANJIN ENERGIES
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