US 10,094,881 B2Granted

Battery fuel gauging system

AssigneeDongguan Cellwise Microelectronics Co., Ltd.

InventorWeili Zhu

Life of this patent

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Abstract

The present disclosure discloses a battery fuel gauging system, which includes a battery voltage collecting module and a microprocessor module. An input terminal of the battery voltage collecting module is configured to collect a terminal voltage of the battery. The microprocessor module is configured to receive the terminal voltage and estimate the remaining charge in the battery. The microprocessor module estimates an open-circuit voltage of the battery according to the terminal voltage of the battery and a built-in battery model, and further calculates the battery's remaining charge based on SOC-OCV relations of a typical lithium-ion battery. The present disclosure is capable of maintaining the precision of the battery fuel gauging system and can set the battery fuel gauging system inside or outside of the battery.

Claims19

Dependent claims

A battery fuel gauging system, comprising:

a battery comprising a terminal voltage, an open-circuit voltage and a built-in battery model;
a battery voltage collecting module comprising an input terminal and an output terminal, the input terminal being connected to the battery and configured to collect the terminal voltage of the battery, wherein the battery voltage collecting module works intermittently;
a microprocessor module, being connected to the output terminal of the battery voltage collecting module and configured to receive the terminal voltage of the battery and estimate remaining charge in the battery;
wherein, the microprocessor module estimates the open-circuit voltage of the battery according to the terminal voltage of the battery in conjunction with the built-in battery model, and further calculates the battery's remaining charge based on SOC-OCV(state of charge-open-circuit voltage) relations of a typical lithium-ion battery, the built-in battery model is described by the following equation set:
V
o
⁡
(
t
)
=
V
ocv
⁡
(
t
)
-
I
1
⁡
(
t
)
*
R
1
-
I
2
⁡
(
t
)
*
R
2
(
1
)
I
2
⁡
(
t
)
*
R
2
=
V
C
1
⁡
(
t
)
(
2
)
∫
0
t
⁢
I
2
-
I
1
C
1
⁢
dt
=
V
C
1
⁡
(
t
)
(
3
)
SOC
⁡
(
t
)
=
SOC
⁡
(
0
)
-
∫
0
t
⁢
I
1
⁡
(
t
)
⁢
dt
(
4
)
wherein, Vo(t) represents the terminal voltage of the battery, Vocv(t) represents the open-circuit voltage of the battery, R1 represents an equivalent ohmic resistance of the battery, R2 represents an equivalent polarization differential resistance, I1(t) represents charge current or discharge current of the battery, and I2(t) represents the current flowing through the equivalent polarization differential resistance R2, SOC(t) is the present remaining charge in the battery, and SOC(0) is initial charge amount of the battery, C1 represents a responding speed of the polarization voltage differential to current excitation and is decided by the intrinsic characteristics of the battery, the present open-circuit voltage of the battery is calculated according to the built-in battery model in conjunction with the presently collected terminal voltage of the battery, and the present open-circuit voltage of the battery is further utilized to calculate the remaining charge in the battery according to the SOC-OCV relations of the typical lithium-ion battery.

109 more elements

A battery fuel gauging method, wherein the battery comprises a terminal voltage Vo(t), an open-circuit voltage Vocv(t) and a built-in battery model, comprising:

establishing SOC-OCV (state of charge-open-circuit voltage) relations of a typical lithium-ion battery, wherein the SOC-OCV relations are the relations between the open-circuit voltage Vocv(t) of the battery and present remaining charge SOC(t) in the battery;
establishing the built-in battery model of the battery, the built-in battery model of the battery being described by the following equation set:
V
o
⁡
(
t
)
=
V
ocv
⁡
(
t
)
-
I
1
⁡
(
t
)
*
R
1
-
I
2
⁡
(
t
)
*
R
2
(
1
)
I
2
⁡
(
t
)
*
R
2
=
V
C
1
⁡
(
t
)
(
2
)
∫
0
t
⁢
I
2
-
I
1
C
1
⁢
dt
=
V
C
1
⁡
(
t
)
(
3
)
SOC
⁡
(
t
)
=
SOC
⁡
(
0
)
-
∫
0
t
⁢
I
1
⁡
(
t
)
⁢
dt
(
4
)
wherein, Vo(t) represents the terminal voltage of the battery, Vocv(t) represents the open-circuit voltage of the battery, R1 represents an equivalent ohmic resistance of the battery, R2 represents an equivalent polarization differential resistance, I1(t) represents charge current or discharge current of the battery, and I2(t) represents the current flowing through the equivalent polarization differential resistance R2, SOC(t) is the present remaining charge in the battery, and SOC(0) is initial charge amount of the battery, C1 represents a responding speed of the
polarization voltage differential to current excitation and is decided by the intrinsic characteristics of the battery, equation (4) is an SOC characteristic equation of the battery, with which the SOC characteristic of the battery at every time point is in accordance;
estimating the charge current or discharge current I1(t) of the battery at a present time point depending on the SOC characteristic of the battery at a previous sampling time point;
calculating the current I2(t) flowing through the polarization differential resistance R2 according to equations (2) and (3) with the present charge current or discharge current I1(t) of the battery;
calculating the present open-circuit voltage Vocv(t) of the battery according to equation (1) together with the present charge current or discharge current Ii(t) of the battery, the present current I2(t) flowing through the polarization differential resistance R2, and a presently collected terminal voltage Vo(t) of the battery;
and
estimating the remaining charge in the battery, according to the SOC-OCV relations of the typical battery model with the present open-circuit voltage of the battery.

113 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/768,603Filed 31 Jul 2013
Priority: CN 2013 1 006421828 Feb 2013
Published: US 2016/0003913 A17 Jan 2016
Granted: 9 Oct 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01R 31/367
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
G01R 31/3835
Arrangements for monitoring battery or accumulator variables, e.g. SoC: involving only voltage measurements
G01R 31/388
Determining ampere-hour charge capacity or SoC: involving voltage measurements
H01M 10/48
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators combined with arrangements for…

Family

US 2016/0003913 A1Pre-grant publication · published 7 Jan 2016
US 10,094,881 B2This patent

From the US filing history. Foreign family members aren’t listed.

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Abstract

A battery fuel gauging system, comprising:

a battery comprising a terminal voltage, an open-circuit voltage and a built-in battery model;
a battery voltage collecting module comprising an input terminal and an output terminal, the input terminal being connected to the battery and configured to collect the terminal voltage of the battery, wherein the battery voltage collecting module works intermittently;
a microprocessor module, being connected to the output terminal of the battery voltage collecting module and configured to receive the terminal voltage of the battery and estimate remaining charge in the battery;
wherein, the microprocessor module estimates the open-circuit voltage of the battery according to the terminal voltage of the battery in conjunction with the built-in battery model, and further calculates the battery's remaining charge based on SOC-OCV(state of charge-open-circuit voltage) relations of a typical lithium-ion battery, the built-in battery model is described by the following equation set:
V
o
⁡
(
t
)
=
V
ocv
⁡
(
t
)
-
I
1
⁡
(
t
)
*
R
1
-
I
2
⁡
(
t
)
*
R
2
(
1
)
I
2
⁡
(
t
)
*
R
2
=
V
C
1
⁡
(
t
)
(
2
)
∫
0
t
⁢
I
2
-
I
1
C
1
⁢
dt
=
V
C
1
⁡
(
t
)
(
3
)
SOC
⁡
(
t
)
=
SOC
⁡
(
0
)
-
∫
0
t
⁢
I
1
⁡
(
t
)
⁢
dt
(
4
)
wherein, Vo(t) represents the terminal voltage of the battery, Vocv(t) represents the open-circuit voltage of the battery, R1 represents an equivalent ohmic resistance of the battery, R2 represents an equivalent polarization differential resistance, I1(t) represents charge current or discharge current of the battery, and I2(t) represents the current flowing through the equivalent polarization differential resistance R2, SOC(t) is the present remaining charge in the battery, and SOC(0) is initial charge amount of the battery, C1 represents a responding speed of the polarization voltage differential to current excitation and is decided by the intrinsic characteristics of the battery, the present open-circuit voltage of the battery is calculated according to the built-in battery model in conjunction with the presently collected terminal voltage of the battery, and the present open-circuit voltage of the battery is further utilized to calculate the remaining charge in the battery according to the SOC-OCV relations of the typical lithium-ion battery.

109 more elements

Facts

Application

14/768,603Filed 31 Jul 2013

Priority

CN 2013 1 006421828 Feb 2013

Published

US 2016/0003913 A17 Jan 2016

Granted

9 Oct 2018

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G01R 31/367
Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of…
G01R 31/3835
Arrangements for monitoring battery or accumulator variables, e.g. SoC: involving only voltage measurements
G01R 31/388
Determining ampere-hour charge capacity or SoC: involving voltage measurements
H01M 10/48
Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells: accumulators combined with arrangements for…