Battery allowable current model establishing method and device and battery management system
A technology of current model and establishment method, applied in the direction of measurement device, measurement of electricity, measurement of electricity variables, etc., can solve the problem of inability to predict the allowable current of the battery
Pending Publication Date: 2022-04-15
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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[0007] Embodiments of the present invention provide a method, device, and battery management system for establishing a battery allowable current model, so as to at least solve the problem in the prior art that the allowable current of the battery under each aging cycle cannot be accurately predicted
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[0028] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.
[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.
[0030] It should be noted that the terms...
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The invention discloses a method and a device for establishing a battery allowable current model and a battery management system. The method for establishing the battery allowable current model comprises the following steps: determining an open-circuit voltage UOCV and a working cut-off voltage Ucut of a battery under a preset working condition; a plurality of critical internal resistances R are calculated according to the open-circuit voltage UOCV, the working cut-off voltage Ucut-off and a plurality of preset working currents I with different sizes, and the critical internal resistances R are in one-to-one correspondence with the preset working currents I; according to the internal resistance change model of the battery under the preset working condition, the multiple preset working currents I and the multiple critical internal resistances R, multiple aging periods are determined, and the critical internal resistances R are in one-to-one correspondence with the aging periods; and establishing an allowable current model of the battery according to the plurality of preset working currents I and the plurality of aging periods in one-to-one correspondence with the plurality of preset working currents I. According to the method for establishing the allowable current model of the battery, the problem that the allowable current of the battery in each aging period cannot be accurately predicted in the prior art is solved.
Description
technical field [0001] The invention relates to the field of battery management, in particular to a method and device for establishing a battery allowable current model, and a battery management system. Background technique [0002] With the advancement of science and technology, batteries play an irreplaceable role in more and more products, and the maximum discharge power (allowable power) of batteries is different at different life stages. In actual use, the maximum discharge power The acquisition of power is very important, which is of great significance to prevent the battery from over-discharging and increase the service life of the battery. [0003] For example, with the implementation of the specific policy of "carbon peaking and carbon neutrality", new energy vehicles including pure electric vehicles (BEV), plug-in hybrid (PHEV), hybrid (HEV) and 48V systems have been vigorously promoted, further promoting The rapid development of power lithium-ion batteries. The ...
Claims
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IPC IPC(8): G01R31/367
Inventor 何永武翟秀梅陈甜戴豪刘瑶俊
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD