Power battery cycle life evaluation method
A cycle life and power battery technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems affecting the cycle life of lithium-ion batteries, etc., to optimize the design of battery systems and electric vehicles, and improve the accuracy of cycle life. Effect
Inactive Publication Date: 2019-11-19
江西优特汽车技术有限公司
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Problems solved by technology
Working conditions, matching conditions, and battery management systems will seriously affect the actual cycle life of lithium-ion batteries, which is not considered by existing cycle life test and evaluation technologies
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[0014] The specific implementation manner of the present invention will be described in further detail below by describing the best embodiment with reference to the accompanying drawings.
[0015] The present invention obtains a relatively accurate method for estimating the actual life of the battery in consideration of the configuration, working conditions, and parameters of the battery management system, and fully considers the influence of the working conditions, configuration and battery management system on the cycle life of the power battery to obtain a more accurate method. Practical power battery cycle life prediction results are helpful to select battery cells, assembly technology and battery management system according to the design purpose of electric vehicles, and optimize battery system and electric vehicle design.
[0016] Specifically include the following steps:
[0017] Step 1: Test the cycle life L0 of the power battery unit under standard cycle conditions. ...
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The invention discloses a power battery cycle life evaluation method. The method comprises the following steps that: S1, the cycle life L0 of each power battery under a standard circulating working condition is tested; S2, a service life working condition shortening coefficient K1 used for characterizing the loss of the cycle life of each battery caused by the operating working condition of the corresponding battery, a service life matched packing shortening coefficient K2 for characterizing the influence of the matched packing of the batteries on the cycle lives of the batteries and a servicelife management system shortening coefficient K3 used for characterizing the influence of a battery management system on the cycle lives of the batteries are acquired; and S3, the expected cycle lifeof a battery pack under the influence of K1, K2 and K3 is calculated, and the expected cycle life of the battery pack can be the product of L0*K1*K2*K3. According to the method, the influence of working conditions, matched packing, battery management system parameters and the like on the cycle lives is considered, and therefore, the accuracy of the calculated cycle lives of the batteries is improved; obtained cycle life data are favorable for selecting battery cells, matched packing technologies and battery management systems according to the design purposes of electric automobiles, and the design of battery systems and electric automobiles is optimized.
Description
technical field [0001] The invention relates to the field of power batteries, in particular to a method for evaluating cycle life of a power battery. Background technique [0002] For power batteries, cycle life is an important indicator. Lithium-ion batteries have become the preferred power batteries for electric vehicles due to their high specific energy and long cycle life. The storage life of lithium-ion batteries at room temperature can reach more than 10 years. Today, it is used as the power battery system of electric vehicles, and the operating life requirement meets the requirements of more than 8 years. Therefore, the cycle life of power lithium battery is one of the indicators that battery manufacturers and electric vehicle manufacturers are more concerned about. In the prior art, the cycle life of the battery is mainly carried out on the battery charge and discharge test equipment. To perform a complete lifetime assessment, more than 2,000 charge-discharge cycl...
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IPC IPC(8): G01R31/367G01R31/385
CPCG01R31/367G01R31/385
Inventor 李世明徐秋鹏胡庆军
Owner 江西优特汽车技术有限公司