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A Soh Estimation Method Based on Cell Voltage Statistics

A single voltage and initial voltage technology, applied in the direction of measuring electricity, electric vehicles, measuring electrical variables, etc., can solve the problem of low precision and achieve the effect of avoiding difficulty and avoiding deviation

Active Publication Date: 2019-07-12
成都雅骏新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to: aim at the problems existing in the prior art, provide a kind of SOH estimation method based on cell voltage statistics, solve the problem of low accuracy of the existing SOH estimation method

Method used

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  • A Soh Estimation Method Based on Cell Voltage Statistics
  • A Soh Estimation Method Based on Cell Voltage Statistics
  • A Soh Estimation Method Based on Cell Voltage Statistics

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Embodiment

[0025] This embodiment provides a method for SOH estimation based on cell voltage statistics. The cell voltage is recorded during each real-time DC charging, and the change of the cell voltage during the DC charging process is statistically analyzed to estimate the relative SOH. The present invention mainly has two problems, one is the control of the DC charging process, and the other is the selection of the single voltage sampling point.

[0026] A method of SOH estimation based on cell voltage statistics of this embodiment, such as figure 1 As shown, the following steps are included in sequence:

[0027] A. Charge stage control, select standard overcharge;

[0028] B. Select the voltage sampling point, select and record the voltage point during the charging phase;

[0029] C. Voltage sampling point filtering, filtering and storing single voltage record value;

[0030] D. Relative SOH estimation.

[0031] The following is a further description of each step:

[0032] A. Charge stage cont...

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Abstract

The invention provides an SOH estimation method based on monomer voltage statistics. The method comprises steps of recording monomer voltage during real-time direct-current charging every time; and counting and analyzing change of the monomer voltage in the direct-current charging process and then estimating relative SOH. According to the invention, difficulties in SOH estimation in different application scenes can be avoided and deviation of algorithm estimation caused by different cell types can be avoided.

Description

Technical field [0001] The invention relates to the field of algorithms for vehicle power battery functions, in particular to an SOH estimation method based on monomer voltage statistics. Background technique [0002] At present, the vehicle power battery is used in the full life cycle of the user, and the power battery will attenuate with the use time, which will affect the normal use of the power battery. Therefore, the SOH (power battery state of health) is estimated to accurately reflect the power battery SOC (battery state of charge) to meet the user's reasonable use. Currently, there are two solutions for SOH estimation. [0003] The first method is to design a solution from the internal characteristics of the power battery, estimate the actual capacity and internal resistance of the power battery, and then estimate the SOH. [0004] The second type: design the solution from the use characteristics of the power battery, estimate the characteristic parameter design such as the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/392G01R31/396B60L58/12
CPCB60L58/12B60L2240/547G01R31/3648G01R31/392G01R31/396Y02T10/70
Inventor 陕亮亮戴润义廖茜
Owner 成都雅骏新能源科技有限公司
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