Battery cell safety identification method and device
A technology for safety identification and battery cell, applied in measuring devices, measuring electricity, measuring electrical variables, etc., can solve problems such as poor pertinence and accuracy, cannot avoid extreme accidents, and cannot identify abnormal self-discharge batteries in advance, etc. The effect of early identification and avoidance of extreme accidents
Pending Publication Date: 2022-01-28
安徽明德源能科技有限责任公司
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that in the prior art, the safety of the battery is judged by the evaluation method of the consistency of the battery pack monomer, which is poor in pertinence and accuracy, and cannot identify abnormal self-discharging cells in advance, so that it cannot be avoided. occurrence of extreme accidents
Method used
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Experimental program
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Embodiment 1
[0040] Based on Embodiment 1, Embodiment 2 of the present invention also provides a cell security identification device, which includes:
[0041] The first cell voltage acquisition module is used to record the cell voltages of all cells in a battery pack when the battery pack is fully charged and stop charging or discharging for more than two hours;
[0042] The second cell voltage acquisition module is used to re-record the cell voltages of all cells under the same working conditions after a preset time;
[0043] The voltage difference sequence acquisition module is used to calculate the voltage difference between the two tested voltages of each string of batteries, and obtain the voltage difference sequence of the battery pack single cells tested twice;
[0044] The data processing module is used to calculate the average value and standard deviation of each data in the pressure difference sequence, and calculate the deviation from the mean of the pressure difference sequence...
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The invention discloses a battery cell safety identification method and device. The method comprises the steps of: recording the voltages of all battery cells in a battery pack under the condition that the battery pack is fully charged and charging or discharging is stopped for more than two hours; after a preset time, under the same working condition, recording the voltages of all the battery cells again; calculating the voltage difference between the voltages of each string of cells in two tests to obtain a voltage difference sequence of the cells of the battery pack in the two tests; calculating an average value and a standard deviation of each data in the pressure difference sequence, and respectively calculating a deviation from average of the pressure difference sequence; and if the deviation from average corresponding to a certain string of battery cells is a positive value and the absolute value is greater than A times of the standard deviation, determining that the string of battery cells has abnormal self-discharge, and handling the string of battery cells; The method and the device have the advantages that the self-discharge abnormity of the battery cells is identified in advance, the normal battery cells and the abnormal self-discharge battery cells are accurately distinguished in a targeted manner, the risk of the battery pack is identified in advance, and extreme accidents are avoided.
Description
technical field [0001] The present invention relates to the field of new energy storage systems, and more specifically relates to a battery security identification method and device. Background technique [0002] At present, lithium-ion batteries have been more and more widely used in the field of energy storage, especially in the field of backup power, the use of lithium-ion batteries has exploded, and accidents are frequent; battery safety has always been a concern in the new energy industry one of the focal points. The abnormal self-discharge of the battery cell can easily lead to serious battery accidents such as internal short circuit and thermal runaway, which is one of the main factors affecting battery safety. Therefore, early identification of abnormal self-discharge cells can largely prevent extreme accidents. It is of great significance to improve battery safety. [0003] At present, in the battery pack (on the BMS) or on the battery management platform, only th...
Claims
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Login to View More IPC IPC(8): G01R31/36
CPCG01R31/36
Inventor 孙柏林赵博特雷建平
Owner 安徽明德源能科技有限责任公司