Battery monitoring system for a lift device

Patent metadata

Field	Value
Publication number	US-12358397-B2
Application number	US-202418736139-A
Country	US
Kind code	B2
Filing date	Jun 6, 2024
Priority date	Mar 6, 2020
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

Abstract

A lift device includes multiple electrical components and a battery monitoring system. The battery monitoring system includes multiple batteries and a controller. The multiple batteries are configured to power the multiple electrical components. The controller is configured to obtain sensor data from the batteries. The controller is also configured to determine a state of charge of the batteries for open circuit conditions based on the sensor data. The controller is configured to determine a state of charge of the batteries for load conditions based on the sensor data. The controller is configured to determine a state of charge of the batteries for charging conditions based on the sensor data. The controller determines an overall state of charge of the batteries based on the state of charge for open circuit conditions, the state of charge of the batteries for load conditions, and the state of charge for charging conditions.

First claim

The invention claimed is:

1. A lift device comprising:
a plurality of electrical components; and
a battery monitoring system comprising:
a plurality of batteries configured to provide power to the plurality of electrical components; and
processing circuitry configured to:
determine an overall state of charge of the plurality of batteries based on a state of charge for open circuit conditions, a state of charge of the plurality of batteries for load conditions, and a state of charge for charging conditions, wherein in one or more conditions, the overall state of charge is a weighted average of at least two of the state of charge for open circuit conditions, the state of charge for load conditions, and the state of charge for charging conditions; and
operate a display screen to notify an operator regarding the overall state of charge of the plurality of batteries.

2. The lift device of claim 1 , wherein weights of the weighted average are determined by the processing circuitry using a current of the power charging or discharging from the plurality of batteries.

3. The lift device of claim 1 , wherein the state of charge of the plurality of batteries for open circuit conditions, the state of charge of the plurality of batteries for load conditions, and the state of charge of the plurality of batteries for charging conditions are determined by the processing circuitry based on sensor data obtained from the plurality of batteries.

4. The lift device of claim 1 , wherein the processing circuitry is further configured to:
determine an amount of electrolyte present in the plurality of batteries based on a Hydrogen evolution rate of the plurality of batteries.

5. The lift device of claim 1 , wherein the processing circuitry is wirelessly communicably coupled with a user device and is configured to generate a report for the user device, the report comprising the overall state of charge of the plurality of batteries, wherein the processing circuitry is configured to operate the user device to provide at least one of the overall state of charge of the plurality of batteries, the state of charge of the plurality of batteries for open circuit conditions, the state of charge of the plurality of batteries for load conditions, or the state of charge of the plurality of batteries for charging conditions.

6. The lift device of claim 1 , wherein the processing circuitry is further configured to determine a battery health of one or more of the plurality of batteries based on a plurality of equivalent series resistance values each determined at different times and a battery temperature, wherein each of the plurality of equivalent series resistance values is determined based on:
a difference between (1) a voltage across the plurality of batteries before a battery function is performed and (2) a voltage across the plurality of batteries while the battery function is performed; and
a load current of the plurality of batteries that causes the difference.

7. The lift device of claim 1 , wherein the processing circuitry is further configured to determine a battery fluid level and a percent of fluid remaining in the plurality of batteries relative to a maximum level.

8. A battery monitoring system for a lift device, the battery monitoring system comprising:
a plurality of batteries configured to power a plurality of electrical components of the lift device; and
processing circuitry configured to:
determine an overall state of charge of the plurality of batteries based on a state of charge for open circuit conditions, a state of charge of the plurality of batteries for load conditions, and a state of charge for charging conditions, wherein in one or more conditions, the overall state of charge is a weighted average of at least two of the state of charge for open circuit conditions, the state of charge for load conditions, and the state of charge for charging conditions; and
operate a display screen to notify an operator regarding the overall state of charge of the plurality of batteries.

9. The battery monitoring system of claim 8 , wherein the processing circuitry is further configured to:
determine an amount of electrolyte present in the plurality of batteries based on a Hydrogen evolution rate of the plurality of batteries.

10. The battery monitoring system of claim 8 , wherein the processing circuitry is wirelessly communicably coupled with a user device and is configured to generate a report for the user device, the report comprising the overall state of charge of the plurality of batteries.

11. The battery monitoring system of claim 10 , wherein the processing circuitry is configured to operate the user device to provide at least one of the overall state of charge of the plurality of batteries, the state of charge of the plurality of batteries for open circuit conditions, the state of charge of the plurality of batteries for load conditions, or the state of charge of the plurality of batteries for charging conditions.

12. The battery monitoring system of claim 8 , wherein the processing circuitry is further configured to determine a battery health of one or more of the plurality of batteries.

13. The battery monitoring system of claim 12 , wherein the processing circuitry is configured to determine the battery health based on a plurality of equivalent series resistance values each determined at different times and a battery temperature, wherein each of the plurality of equivalent series resistance values is determined based on:
a difference between (1) a voltage across the plurality of batteries before a battery function is performed and (2) a voltage across the plurality of batteries while the battery function is performed; and
a load current of the plurality of batteries that causes the difference.

14. The battery monitoring system of claim 8 , wherein the processing circuitry is further configured to determine a battery fluid level and a percent of fluid remaining in at least one of the plurality of batteries relative to a maximum level.

15. A method, comprising:
determining an overall state of charge of a plurality of batteries based on a state of charge of the plurality of batteries for open circuit conditions, a state of charge of the plurality of batteries for load conditions based, and a state of charge of the plurality of batteries for charging conditions, wherein in one or more conditions, the overall state of charge is determined based on at least two of the state of charge of the plurality of batteries for open circuit conditions, the state of charge of the plurality of batteries for load conditions, or the state of charge of the plurality of batteries for charging conditions; and
operating a display screen to provide the overall state of charge of the plurality of batteries to a user.

16. The method of claim 15 , wherein determining the overall state of charge comprises determining a weighted average of at least two of the state of charge of the plurality of batteries for open circuit conditions, the state of charge of the plurality of batteries for load conditions, or the state of charge of the plurality of batteries for charging conditions.

17. The method of claim 15 , further comprising:
determining an amount of electrolyte present in the plurality of batteries based on a Hydrogen evolution rate of the plurality of batteries.

18. The method of claim 15 , further comprising determining a battery health of one or more of the plurality of batteries.

19. The method of claim 18 , wherein the battery health is determined based on a

Assignees

• Oshkosh Corp

Inventors

• Eshleman Stefan
• Bolton Michael
• Booth Patrick

Classifications

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/84

  Control of state of health [SOH] · CPC title

• H02J7/82 Primary

  Control of state of charge [SOC] · CPC title

• H04Q9/00

  Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom · CPC title

• H01M2010/4278

  Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller · CPC title