Method and device for estimating open circuit voltage of battery based on a gas-liquid dynamic model

Patent metadata

Field	Value
Publication number	US-11428741-B2
Application number	US-201916965062-A
Country	US
Kind code	B2
Filing date	Mar 29, 2019
Priority date	Mar 21, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A method and device for estimating an open circuit voltage of a battery based on a gas-liquid dynamic model, includes the following steps: deriving an undetermined equation for estimating the open circuit voltage according to a gas-liquid dynamic model; identifying the estimation equation parameters according to experimental data; designing a method for estimating the open circuit voltage according to the complete equation for estimating open circuit voltage and calculating to obtain an estimated value of the open circuit voltage. The estimation equation of open circuit voltage includes the battery temperature. The experimental data includes open circuit voltages under different currents, terminal voltages and temperatures, optimal values of undetermined parameters of the equation for estimating open circuit voltage are identified with an identification method, and the optimal values of undetermined parameters are substituted into the undetermined equation for estimating open circuit voltage in the deriving step to obtain a complete equation.

First claim

The invention claimed is:

1. A method for estimating an open circuit voltage of a battery based on a gas-liquid dynamic model, the method comprising the following steps:
step 1: deriving an undetermined equation for estimating the open circuit voltage on the basis of the gas-liquid dynamic model, and embedding the undetermined equation for estimating the open circuit voltage into a single chip microcomputer of an estimation component for the open circuit voltage;
step 2: identifying parameters of the undetermined equation for estimating the open circuit voltage on the basis of experimental data: open circuit voltages under different currents, terminal voltages and temperatures obtained through experimental tests, identifying optimal values of undetermined parameters with an identification method, and substituting the optimal values of undetermined parameters into the undetermined equation for estimating the open circuit voltage to obtain a complete equation for estimating the open circuit voltage; and
step 3: acquiring signals of current, temperature, and voltage of the battery through a signal acquisition component, which transmits the acquired signals of current, temperature, and voltage to the single chip microcomputer of the estimation component for the open circuit voltage, the single chip microcomputer designing a process for estimating the open circuit voltage on the basis of the complete equation for estimating the open circuit voltage, and calculating to obtain an estimated value of the open circuit voltage;
wherein the undetermined equation for estimating the open circuit voltage in the step 1 is:

P
3

=

(

P
1

+
lT

)

⁢

(

P
2

-
lT

)

-

kT
2

+

(

lT
+

P
1

)

2

⁢

(

lT
+

P
2

)

2

+

k
2

⁢

T
4

+

2
⁢

(

lT
+

P
1

)

⁡

[

klT
3

+

kT
2

⁡

(

2
⁢

P
1

-

P
2

)

]

2
⁢

(

l

Assignees

• Univ Jiangsu

Inventors

• Chen Biao
• Jiang Haobin
• Sun Huayang
• Li Huanhuan
• Hua Lei

Classifications

• G01R31/367 Primary

  Software therefor, e.g. for battery testing using modelling or look-up tables · CPC title

• G06F17/10

  Complex mathematical operations {(function generation by table look-up G06F1/03; evaluation of elementary functions by calculation G06F7/544)} · CPC title

• G01R31/374

  with means for correcting the measurement for temperature or ageing · CPC title

• G01R31/3648

  comprising digital calculation means, e.g. for performing an algorithm · CPC title