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A fast estimation method of open circuit voltage of secondary battery

An open-circuit voltage, secondary battery technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of limited operating temperature range, poor versatility, and slow acquisition of battery open-circuit voltage.

Active Publication Date: 2016-01-20
HARBIN INST OF TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of slow acquisition speed, poor versatility, and limitation of the working temperature range of the existing battery open circuit voltage, thereby providing a method for quickly estimating the open circuit voltage of the secondary battery

Method used

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  • A fast estimation method of open circuit voltage of secondary battery
  • A fast estimation method of open circuit voltage of secondary battery
  • A fast estimation method of open circuit voltage of secondary battery

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specific Embodiment approach 1

[0032] DETAILED DESCRIPTION One, a method for quickly estimating the open circuit voltage of a secondary battery, which is realized by the following steps:

[0033] Step 1: Perform n times of voltage sampling on the battery within the first A minutes after entering the open circuit state, and obtain n open circuit times t k with voltage value U RLX，k ; A is a positive number; k=1, 2,..., n, represents the kth sampling point; n is an integer greater than 2;

[0034] Step 2: Establish the open circuit time t k and by the diffusion capacitance C d with diffusion resistance R d The relaxation time τ of the diffusion-polarized link consisting of d A linear function of:

[0035] τ d,k =αt k +β

[0036] In the formula: α and β are coefficients used to characterize the linear relationship;

[0037] Substituting the above linear function into the traditional second-order equivalent model, the battery discharge voltage U RLX An improved model of:

[0038] ...

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Abstract

The invention discloses a method for quickly estimating an open circuit voltage of a secondary battery, which relates to the technical field of battery management. The method is used for solving the problems of the open circuit voltage of an existing battery of slow obtaining speed, poor universality and limitation caused by working temperature range. The method disclosed by the invention can be used for estimating the open circuit voltage of the battery by obtaining the time and the voltage data of the battery in an open circuit status within former few minutes and introducing the time and voltage data into a model of the invention. The method disclosed by the invention can be used for estimating the final open circuit voltage of the battery within several minutes. The method disclosed by the invention is suitable for quickly estimating the open circuit voltage of the secondary battery.

Description

technical field [0001] The invention relates to the technical field of battery management, in particular to a method for estimating the open-circuit voltage of a secondary battery. Background technique [0002] As an important parameter of the battery, the open circuit voltage (OCV) of the battery reflects the internal state of the battery and plays an important role in various fields of battery technology. Since the open circuit voltage of the battery depends on the battery electrode material and the active material content in the material, the open circuit voltage of the battery can not only be used to analyze the energy level characteristics of the battery electrode, but also can be used to estimate the remaining state of charge (SOC) of the battery. The open circuit voltage of the battery can also be used to estimate the state of health (SOH) of the battery. For example, in Li-ion batteries, as the battery ages, the open circuit voltage of the battery only decays in its ...

Claims

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Application Information

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IPC IPC(8): G01R19/00
Inventor 朱春波王天鸶裴磊逯仁贵魏国王婷婷
Owner HARBIN INST OF TECH
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