Lithium ion battery life estimation method and device
A lithium-ion battery and life estimation technology, which is applied in the automotive field, can solve the problems of lack of failure probability, ignore the randomness and contingency of sample inconsistency failure, and achieve the effect of improving applicability
Inactive Publication Date: 2019-01-04
CH AUTO TECH CORP CO LTD
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However, this life model lacks the consideration of failure probability, ignores the sample inconsistency and the randomness and contingency of failure
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[0051] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals represent the same parts.
[0052] For the sake of brevity and intuition in description, the solution of the present invention is described below by describing several representative implementation manners. Numerous details in the embodiments are only used to help the understanding of the solutions of the present invention. But obviously, the technical solutions of the present invention may not be limited to these details when implemented. In order to avoid unnecessarily obscuring the solution of the present invention, some embodiments are not described in detail, but only a framework is given. Hereinafter, "including" means "including but not limited to", and "according to..." means "at least accordin...
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The embodiments of the invention disclose a lithium ion battery life estimation method and device. The method includes the following steps: setting n repeated samples for the same life test conditionsof a lithium ion battery and obtaining life test data of the n repeated samples, wherein the n is a positive integer of at least 5; taking a Weibull probability distribution curve as a probability distribution curve of lithium ion battery failure under the same life test conditions, using the life test data of the n repeated samples to obtain shape parameters of the probability distribution curveof the lithium ion battery failure under the same life test conditions and scale parameters expressed as characteristic life, and determining a battery life function under the same life test conditions based on the shape parameters and the scale parameters, wherein an independent variable of the battery life function is failure probability; and receiving specific values of the failure probabilityunder the same life test conditions, and determining battery life corresponding to the specific values of the failure probability under the same life test conditions based on the battery life function under the same life test conditions.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of automobiles, in particular to a method and device for estimating the life of a lithium-ion battery. Background technique [0002] The latest national standard "Terms and Definitions of Vehicle and Trailer Types" (GB / T 3730.1-2001) has the following definition for a vehicle: a non-rail-mounted vehicle driven by power with 4 or more wheels, mainly used for : Carrying people and (or) goods; towing vehicles carrying people and (or) goods; special purpose. Energy shortages, oil crises and environmental pollution are intensifying, which have a huge impact on people's lives and are directly related to the sustainable development of the country's economy and society. All countries in the world are actively developing new energy technologies. [0003] Lithium ion (Li + ) battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the...
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IPC IPC(8): G01R31/367G01R31/392
Inventor 王克坚张雅琨
Owner CH AUTO TECH CORP CO LTD