State of charge algorithm for a battery
First Claim
Patent Images
1. A method of determining the state of charge of a battery comprising the steps of:
- determining whether the battery is in a charge decreasing or increasing mode;
integrating the charge going in and out of the battery to determine a current-based state of charge measurement if the battery is in a charge increasing mode; and
determining the open circuit voltage to determine an open circuit-based state of charge measurement if the battery is in a charge decreasing mode.
14 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for determining the state of charge of a battery including the steps of determining whether the battery is in a charge decreasing, sustaining or increasing mode, integrating the charge going in and out of the battery to determine a current-based state of charge measurement if the battery is in a charge increasing or sustaining mode, and determining the open circuit voltage to determine an open circuit-based state of charge measurement if the battery is in a charge decreasing mode.
-
Citations
17 Claims
-
1. A method of determining the state of charge of a battery comprising the steps of:
-
determining whether the battery is in a charge decreasing or increasing mode;
integrating the charge going in and out of the battery to determine a current-based state of charge measurement if the battery is in a charge increasing mode; and
determining the open circuit voltage to determine an open circuit-based state of charge measurement if the battery is in a charge decreasing mode. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of determining the state of charge of a nickel metal hydride battery comprising:
-
determining whether the nickel metal hydride battery is in a charge increasing, charge sustaining, or charge decreasing mode;
integrating coulombs charging and discharging the battery to determine a first state of charge measurement in a charge increasing or charge sustaining mode; and
determining the open circuit voltage to determine a second state of charge measurement in a charge decreasing mode. - View Dependent Claims (7, 8, 9, 10, 11)
-
-
12. A method of determining the state of charge of a battery operating in a charge increasing, charge sustaining, and charge decreasing mode, the method comprising:
-
integrating current charging and discharging the battery to determine a first state of charge measurement;
determining the open circuit voltage to determine a second state of charge measurement by using a set of data points mapping open circuit voltage to state of charge for the battery; and
determining which of the first state of charge measurement or the second state of charge measurement more accurately represents the actual state of charge of the battery. - View Dependent Claims (13, 14, 15)
-
-
16. A battery state of charge measurement apparatus comprising:
-
a battery pack comprising at least one battery module;
a current sensor coupled to said battery pack to sense current charging and discharging the battery;
a voltage sensor coupled to said battery pack to sense voltage of the battery; and
a controller coupled to said current and voltage sensors, said controller generating a current-based state of charge measurement and a voltage-based state of charge measurement. - View Dependent Claims (17)
-
Specification