Lithium-ion battery cell life detection method
A detection method and battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of small application range, long test period, unusable and so on
Active Publication Date: 2021-09-10
DONGFENG COMML VEHICLE CO LTD
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[0004] The Chinese patent application publication number is CN201710238631.0, and the application publication date is April 13, 2017. The use of new patents discloses a method and system for detecting the cycle life of lithium-ion batteries. The lithium-ion batteries of this method are tested by high-current life It is equivalent to its life at a low current, but it is still necessary to perform a high-current life test on the battery. The test cycle is long, and it is not universal for lithium-ion battery cells with high specific energy and high power functions of the same system and structure. The application range is relatively large. Small
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[0028]The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.
[0029] The invention provides a method for detecting the life of a lithium-ion battery cell, comprising the following steps:
[0030] Step 1. In an environment of 25°C±2°C, first use 1I 1 The current is to fully charge the battery with constant current and constant voltage, and then put it aside for 30 minutes, and then put it aside for 24 hours at a specific temperature T (T=-20°C, -10°C, 0°C, 25°C) and a specific discharge current I (I=Imin, I 1 , Imax) conditions, discharge the battery at a constant current, put it aside for 30 minutes, and measure the specific capacity value of the lithium-ion battery cell.
[0031] Step two, use 1I 1 Current, in an environment of 25°C±2°C, first adjust the battery SOC to 50%, and then put it...
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The purpose of the present invention is to aim at the defects of the prior art, to provide a lithium-ion battery cell life detection model and its detection method, comprising the following steps: obtaining the DC internal resistance of the lithium-ion battery cell standard part at different specific temperatures value; obtain the life curve of the standard part of the lithium-ion battery cell; obtain the DC internal resistance value of the tested part of the lithium-ion battery cell at different specific temperatures; calculate the reference temperature of the standard part of the lithium-ion battery cell at different specific temperatures DC internal resistance change rate; calculate and calculate the equivalent coefficient of the lithium-ion battery cell under test and the standard lithium-ion battery cell; multiply the equivalent coefficient by the life value of the standard part, and draw the lithium-ion battery cell equivalently The life curve of the DUT is used to predict the life of lithium-ion battery cells.
Description
technical field [0001] The invention relates to the technical field of application of new energy vehicle power supplies, in particular to a method for detecting the life of a lithium-ion battery cell. Background technique [0002] The application of lithium-ion batteries in new energy vehicle power supplies is very important. The service life of new energy vehicle power supplies is always the focus of consumers. Therefore, the life of lithium-ion battery cells has become a key factor for designers in the new product design of new energy vehicles. one of the key indicators. In a short cycle, it is very important for the development of new energy vehicles to obtain relatively accurate cycle life characteristics of the lithium-ion batteries used. Since the lithium-ion battery cell has the characteristics of small charge and discharge current, low heat generation, and long cycle life, the cell life curve calculation method is widely used at present. This method is to first tes...
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IPC IPC(8): G01R31/396G01R31/392
CPCG01R31/392G01R31/396
Inventor 孟仙雅冯修成周建刚任卫群宋宏贵罗霄周芷仰
Owner DONGFENG COMML VEHICLE CO LTD