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Soh estimation method and storage medium of lithium iron phosphate battery based on eigenvalue method

A lithium iron phosphate battery and eigenvalue technology, which is applied in the field of SOH estimation method and storage medium of lithium iron phosphate battery, can solve the problems that the estimation conditions are not easy to trigger, and the online estimation of lithium iron phosphate battery SOH cannot be realized, etc.

Active Publication Date: 2022-05-03
深蓝汽车科技有限公司
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Problems solved by technology

[0009] In view of this, the purpose of the present invention is to provide a method and storage medium for estimating the SOH of lithium iron phosphate batteries based on the eigenvalue method, so as to solve the problem that the traditional estimation conditions for estimating the SOH of lithium iron phosphate batteries are not easily triggered, and online estimation of phosphoric acid cannot be realized. Technical problems of lithium iron battery SOH

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  • Soh estimation method and storage medium of lithium iron phosphate battery based on eigenvalue method
  • Soh estimation method and storage medium of lithium iron phosphate battery based on eigenvalue method
  • Soh estimation method and storage medium of lithium iron phosphate battery based on eigenvalue method

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Embodiment Construction

[0027] like figure 1 As shown, a method for estimating the SOH of a lithium iron phosphate battery based on the eigenvalue method includes:

[0028] Step 1. Determine the voltage setting value U through the SOC-OCV curve, charging current and charging resistance of the lithium iron phosphate battery.

[0029] Step 2, during the slow charging and charging process of the lithium iron phosphate battery, when the voltage of the lithium iron phosphate battery is greater than the voltage setting value U, continuously collect the voltage of the lithium iron phosphate battery with a sampling period T, and calculate a sample The voltage collected in one cycle and the voltage difference collected in the previous cycle, and based on each voltage difference, a set value of voltage difference is obtained.

[0030] Step 3. During the slow charging process, record the battery charging capacity when the voltage difference within the sampling period T is less than the set value of the voltage...

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Abstract

The invention provides a method for estimating the SOH of a lithium iron phosphate battery and a storage medium based on an eigenvalue method, and relates to the technical field of battery management systems for new energy vehicles, including analyzing the charging state of the battery through the preset voltage setting value and according to the voltage setting value. The voltage and capacity data in the process are used to determine the set value of the voltage difference, and after the set value of the voltage difference is determined, the charging amount of the battery is counted every 100 seconds, which is used to calculate the cumulative charging capacity in the interval ;Cycle charging test is carried out on the life of lithium iron phosphate battery, and the functional relationship between the accumulated charging capacity and the total battery capacity in the whole life cycle of lithium iron phosphate battery is counted, and the estimation of SOH of lithium iron phosphate battery is realized based on the functional relationship . It solves the problem that the traditional method cannot estimate the SOH of lithium iron phosphate battery online, and also overcomes the technical problem that the trigger condition of the estimation method is difficult to achieve in practice due to the long plateau period of lithium iron phosphate battery.

Description

technical field [0001] The invention relates to the technical field of battery management systems for new energy vehicles, in particular to a method for estimating the SOH of a lithium iron phosphate battery based on an eigenvalue method and a storage medium. Background technique [0002] The SOH decay speed of electric vehicles during use is often inseparable from the internal control of the BMS (Battery Management System). By improving the SOH accuracy of the battery, it can play a greater role in improving the control level of the BMS, and The accuracy of SOH is closely related to the calculation result of battery capacity. [0003] In the existing SOH estimation methods of lithium iron phosphate batteries, there are two commonly used estimation methods, one is through the SOC before charging 1 , SOC after charging 2 And the battery capacity change Q during the charging process 充电 , use the formula (1) to estimate the total capacity of the battery at the current stage,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/378G01R31/382G01R31/367B60L58/12
CPCG01R31/378G01R31/382G01R31/367B60L58/12Y02T10/70
Inventor 张绍虹洪木南郑英朱骞
Owner 深蓝汽车科技有限公司
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