Novel detection method for self-discharge characteristics of lithium iron phosphate system power lithium ion batteries
A lithium-ion battery, lithium iron phosphate technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems affecting the accuracy of data acquisition, the deviation of capacity acquisition conditions, etc., to aggravate the trend of self-discharge changes and improve the accuracy of The effect of increasing the stability and reliability, chemical reactivity
Active Publication Date: 2015-02-18
SHANGHAI AEROSPACE POWER TECH +1
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The traditional self-discharge characteristic is to evaluate the self-discharge characteristic level by comparing the capacity attenuation of the battery before and after aging. This method needs to use charging and discharging equipment to charge and discharge the battery before and after aging, which is vulnerab
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Embodiment 1
[0042] Perform self-discharge detection processing on the lithium iron phosphate power lithium-ion battery after capacity separation: Step 1, SOC state adjustment: use 0.5C current to charge and discharge the battery twice, and then use 0.5C, 0.2C , 0.1C, 0.05C different currents are divided into 4 steps of constant current discharge, adjust the SOC state of the battery to 0%, then charge with a current of 0.5C for 0.8h, and then discharge with a current of 0.5C for 0.1 hour, adjust the SOC state of the battery to 35%; step 2, the first voltage measurement: the battery is left to stand for 24 hours, and the battery voltage OCV1 is detected after the battery voltage is stable; step 3, high temperature aging: the battery is clamped with a special clamp and placed in a high temperature aging room. At 40±3°C, aging for 20 days; step 4, the second voltage measurement: take the battery out of the high-temperature aging room, place it at room temperature for no less than 8±2h, and che...
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The invention discloses a novel detection method for self-discharge characteristics of lithium iron phosphate system power lithium ion batteries. The method comprises the following steps: step 1, charging and discharging batteries, and adjusting SOC (System On Chip) states of the batteries to be 20-40%; step 2, standing for a certain period of time at normal temperature, and measuring open-circuit voltage (OCV)1 of the batteries; step 3, performing high-temperature aging on the batteries; step 4, standing for a certain period of time at normal temperature, and then detecting OCV2 of the batteries; step 5, calculating a voltage drop deltaU of the batteries, wherein deltaU is equal to OCV1-OCV2; and step 6, calculating an average value and standard deviations of the voltage drops of the same group of batteries, determining a self-discharge detection standard of the batteries, and screening. The method for detecting the self-discharge characteristics of the batteries by virtue of voltage differences of the batteries disclosed by the invention can be used for well shielding interference of factors such as equipment, operations and environment temperature existing in a manufacturing process of the batteries in the self-discharge data acquisition accuracy of the batteries, so that the self-discharge characteristic data distortion of a single battery can be avoided, the matching reliability of the batteries can be effectively improved, and the cycle life of a battery pack can be prolonged.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a detection process for the manufacture of lithium iron phosphate power lithium ion batteries, specifically, a new method for detecting the self-discharge characteristics of lithium iron phosphate power lithium ion batteries, including Finally, the SOC state (state of charge) adjustment, voltage measurement, high temperature aging, battery screening and other detection processes are carried out. Background technique [0002] With the continuous development of the global economy, the consumption of energy by human society is increasing day by day, and petrochemical resources are becoming increasingly exhausted. At the same time, problems such as environmental degradation and abnormal climate are intensifying. The development of new energy vehicle technology powered by lithium-ion batteries has become the future energy source of many countries. One of the important strategic dire...
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Inventor 余招宇侯敏王刚庆曹辉
Owner SHANGHAI AEROSPACE POWER TECH
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