A method and system for evaluating battery cell consistency
A technology of battery cells and battery systems, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as the inability to evaluate the consistency of battery cells
Active Publication Date: 2017-10-03
GAC AION NEW ENERGY AUTOMOBILE CO LTD
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Problems solved by technology
[0004] The purpose of the embodiments of the present invention is to provide a method and system for evaluating the consistency of battery cells, which can solve the problem of evaluating battery cells under static conditions before and after being assembled into a battery system in the prior art. Consistency, but it is impossible to evaluate the consistency of battery cells in use after they are assembled into a battery system
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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0031] Such as figure 1 As shown, in the embodiment of the present invention, a method for evaluating the consistency of battery cells is proposed, which is implemented in a battery system composed of multiple battery cells, and the method includes the following steps:
[0032] Step S101, the battery management system collects and records the temperature, current, remaining battery capacity and the voltage value of each battery cell of the battery system at each slice time within the total collection time;
[0033] In the embodiment of the present invention, the consistency of the battery cells is...
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The embodiment of the present invention discloses a method for evaluating the consistency of battery cells. The method includes: the battery management system collects and records the temperature, current, remaining battery capacity of the battery system at each slice time in the total time, and the battery capacity of each cell. Voltage value: Calculate the voltage difference of each cell according to the voltage value of each cell, and count the total number of voltage differences of the cells within the range of the same temperature, remaining battery capacity and current range and the ratio of the number of voltage differences of each cell to the total number; The cell consistency is evaluated according to the ratio. When the number of cell voltage differences exceeding a predetermined threshold in the same current segment accounts for a higher proportion of the total number, it indicates that the cell consistency is worse. The embodiment of the invention also discloses a system for evaluating the consistency of battery cells. The embodiments of the present invention solve the problem in the prior art that only the consistency of battery cells under static conditions before and after assembly of the battery system can be evaluated, but the consistency of battery cells in the state of use after assembly cannot be evaluated.
Description
technical field [0001] The invention relates to the technical field of battery management, in particular to a method and system for evaluating the consistency of battery cells. Background technique [0002] New energy vehicle batteries are composed of multiple battery cells connected in series and parallel, so the requirements for the consistency of the battery cells are very high, and the consistency of the battery cells is usually determined by the battery manufacturer before leaving the factory. The AC internal resistance, capacity and open circuit voltage are tested, and the consistency of the battery monomer is evaluated according to the AC internal resistance, capacity and open circuit voltage obtained by the test, and then the battery cell with the similar AC internal resistance, capacity and open circuit voltage is selected. The battery cells form the battery system. The disadvantage of this method is that it can only evaluate the consistency of the battery cells be...
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IPC IPC(8): G01R31/36
Inventor 梅骜罗杰涂成姣
Owner GAC AION NEW ENERGY AUTOMOBILE CO LTD