Battery management system, battery pack, electric vehicle, and battery management method
A battery management system and battery technology, applied in battery/fuel cell control devices, electric vehicles, batteries, etc., can solve problems such as determining battery degradation information
Pending Publication Date: 2022-03-11
LG ENERGY SOLUTION LTD
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Problems solved by technology
In this way, when the positive electrode-dependent peak and the negative electrode-dependent peak appear together in a narrow capacity range, it is difficult to accurately determine the deterioration information of the battery from these two peaks
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[0033] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before the description, it should be understood that the terms or words used in the specification and appended claims should not be construed as limited to the ordinary and dictionary meanings, but based on the principle of allowing the inventor to define the terms appropriately for the best interpretation , interpreted based on the meanings and concepts corresponding to the technical aspects of the present disclosure.
[0034] Therefore, the embodiments described here and the illustrations shown in the drawings are only the most preferred embodiments of the present disclosure, and are not intended to fully describe the technical aspects of the present disclosure, so it should be understood that at the time of filing this application Various other equivalents and modifications can be made thereto.
[0035] Terms including ordinal numbers...
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The battery management system is used for a battery comprising a positive electrode material and a negative electrode material, the positive electrode material shows a phase change behavior in a preset capacity range, and the negative electrode material has a stable characteristic in the preset capacity range. The battery management system includes a sensing unit that outputs sensing information indicating a voltage and a current of a battery, and a control unit. The control unit determines a voltage curve indicating a correspondence relationship between a capacity of the battery and a voltage of the battery based on sensing information collected during charging or discharging of the battery at a constant current. The control unit determines a differential voltage curve based on the voltage curve. The control unit detects a peak of interest occurring within a predetermined capacity range in the differential voltage curve. The control unit determines a first capacity loss rate of the battery based on the differential voltage of the peak of interest.
Description
technical field [0001] The present disclosure relates to techniques for battery degradation diagnosis. [0002] This application claims the benefit of Korean Patent Application No. 10-2020-0063839 filed with the Korean Intellectual Property Office on May 27, 2020, the disclosure of which is incorporated herein by reference in its entirety. Background technique [0003] Recently, the demand for portable electronic products such as laptop computers, video cameras, and mobile phones has increased rapidly, and with the widespread development of electric vehicles, storage batteries for energy storage, robots, and satellites, there is an ongoing demand for devices that can be repeatedly charged and discharged A lot of research has been done on high-performance batteries. [0004] Currently, batteries available on the market include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, lithium batteries, etc. Among these batteries, lithium-ion batteries have ...
Claims
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IPC IPC(8): G01R31/385
CPCG01R31/385H01M10/48G01R31/392H01M2220/20H01M2010/4271H01M10/052Y02E60/10G01R31/3842G01R19/16528G01R19/30G01R31/3648B60L58/16G01R31/396H02J7/005H02J7/007184H01M10/4257
Inventor 催贤俊金荣德金大洙池秀元
Owner LG ENERGY SOLUTION LTD