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Method for judging lithium-ion-battery cell internal resistance abnormity

A lithium-ion battery and cell technology, which is applied in the measurement of resistance/reactance/impedance, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of increasing the internal resistance monitoring method of the battery cell and scrapping the lithium-ion battery.

Active Publication Date: 2018-06-22
EVE ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a method for judging the abnormality of the internal resistance of a lithium-ion battery cell. By measuring the resistivity of the positive and negative plates, it is predicted whether the internal resistance of the cell is abnormal, which increases the monitoring method for the internal resistance of the cell and reduces the process. The probability of scrapping solves the problem of a large number of scrapping of lithium-ion batteries caused by abnormal pole pieces

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  • Method for judging lithium-ion-battery cell internal resistance abnormity
  • Method for judging lithium-ion-battery cell internal resistance abnormity
  • Method for judging lithium-ion-battery cell internal resistance abnormity

Examples

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Embodiment 1

[0043] figure 1 It is a schematic flow chart of a method for judging abnormal internal resistance of a lithium-ion battery cell provided by Embodiment 1 of the present invention. see figure 1 , the method includes:

[0044] S110. Obtain resistivity data of a plurality of positive and negative electrode sheets to be formed into a lithium-ion battery, and group the positive and negative electrode sheets according to the resistivity data.

[0045] Among them, the positive and negative electrodes to be composed of lithium-ion batteries include the positive and negative electrodes that have been stripped and cut into pieces and passed the inspection; the qualified inspection includes the slurry viscosity of the positive and negative electrodes, and the electrodes (unless otherwise specified, " Pole piece" includes both the positive pole piece and the negative pole piece) The surface density of the coating, the cold-pressed thickness of the pole piece, and the rebound thickness of...

Embodiment 2

[0075] figure 2 It is a schematic flowchart of a method for judging abnormal internal resistance of a lithium-ion battery cell provided by Embodiment 2 of the present invention. see figure 2 , on the basis of the first embodiment above, the method includes:

[0076] S210. Acquiring size parameters of a plurality of positive and negative electrode sheets to be formed into a lithium-ion battery.

[0077] Wherein, the size parameters of the positive and negative electrodes of the lithium-ion battery include the length, width, boundary area, and effective measurement area of ​​the positive and negative electrodes of the lithium-ion battery. The units of the above dimensions are all length units, which may be millimeters (mm) for example.

[0078] optional, image 3 It is a schematic diagram of the size parameters of a positive and negative electrode sheet provided in Embodiment 2 of the present invention, Figure 4 It is a schematic diagram of the size parameters of another...

Embodiment 3

[0122] Figure 5 It is a schematic flow chart of a method for judging abnormal internal resistance of a lithium-ion battery cell provided by Embodiment 3 of the present invention. see Figure 5 , on the basis of the first embodiment above, the method includes:

[0123] S310. Obtain the resistivity data of a plurality of positive and negative electrode sheets to be formed into lithium ion batteries, and group the positive and negative electrode sheets by using a two-factor multi-level grouping method according to the resistivity data.

[0124] Wherein, the two factors are positive sheet resistivity and negative sheet resistivity;

[0125] The multiple levels are a plurality of resistivity value intervals evenly divided according to the range of resistivity data of a plurality of positive and negative electrodes of a lithium-ion battery to be formed.

[0126] Wherein, the value range of resistivity can be represented by the median value of the range. Exemplarily, the value ra...

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Abstract

The invention discloses a method for judging lithium-ion-battery cell internal resistance abnormity. The method includes: acquiring the resistivity data of a plurality of positive and negative electrode plates for forming a lithium ion battery, and grouping the positive and negative electrode plates according to the resistivity data; corresponding combining the positive and negative electrode plates in each group according to the grouping result to form lithium-ion-battery cells; acquiring the average value of the internal resistance of each group of lithium-ion-battery cells; determining theresistivity boundary range of the positive and negative electrode plates forming the electrodes of the lithium ion battery according to the average value of the internal resistance of the lithium-ion-battery cells and internal resistance process standards; when the resistivity of the positive and negative electrode plates for forming the lithium ion battery is located in the resistivity boundary range, eliminating lithium-ion-battery cell internal resistance abnormity caused by positive and negative electrode plate resistivity abnormity. The method has the advantages that whether cell internalresistance is abnormal or not is prejudged by measuring the resistivity of the positive and negative electrode plates, the monitoring method for the cell internal resistance is provided, and processscrappage probability is lowered.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of lithium-ion power batteries, in particular to a method for judging abnormal internal resistance of lithium-ion battery cells. Background technique [0002] Lithium-ion batteries are widely used in electronic equipment and energy fields due to their advantages such as high voltage, high energy density, small size, large capacity and long cycle life. The conventional production process of lithium-ion battery pole pieces includes three processes of mixing, coating and rolling. During the pressing process, the actual compaction of the material area is inconsistent, and the difference in surface and internal porosity is large, which will lead to the quality deviation of the pole piece, resulting in a large difference in the internal resistance of the lithium-ion battery cell. [0003] Generally, there are few detection methods for the pole pieces of lithium-ion batteries. At present,...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R31/36H01M10/0525H01M10/058
CPCG01R27/02G01R31/3648G01R31/389H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 吕鑫张亚飞张智建葛辉明刘金成
Owner EVE ENERGY CO LTD
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