# US 2021/0276450 A1 · Battery monitoring system for a lift device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0276450 A1 - Document ID: US20210276450A1 - Status: Published application - Kind: A1 - Application number: 17/193,358 - Filed: 2021-03-05 - Published: 2021-09-09 - Earliest claimed: 2020-03-06 - Assignees: Oshkosh Corporation - Applicants: Oshkosh Corporation - Inventors: Stefan Eshleman; Michael Bolton; Patrick Booth - Web page: https://patentgrep.com/patent/US20210276450A1 ## CPC - B60L 58/12: responding to state of charge [SoC] - H02J 7/82: Control of state of charge [SOC] - B60L 58/18: of two or more battery modules - B66F 13/00: Common constructional features or accessories - G01R 31/3842: combining voltage and current measurements - G01R 31/392: Determining battery ageing or deterioration, e.g. state of health - H01M 10/4257: {Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries} - H01M 10/482: {for several batteries or cells simultaneously or sequentially} - H01M 10/484: {for measuring electrolyte level, electrolyte density or electrolyte conductivity} - H01M 10/486: {for measuring temperature} - H01M 10/488: {Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density} - H02J 7/80: including monitoring or indicating arrangements - H02J 7/84: Control of state of health [SOH] - H04Q 9/00: 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 - B60L 2200/40: Working vehicles - B66F 11/044: {Working platforms suspended from booms} - H01M 2010/4278: {Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller} - Y02E 60/10: Energy storage using batteries - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - B66F: HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD ({invalid lifting devices A61G7/10; } mounting artificial islands on piles or like supports E02B17/00; scaffolding combined with lifting devices E04G1/22; lifting devices for sliding forms E04G11/24; lifting of buildings E04G23/06; shores or struts E04G25/00; lifts or other hoisting devices on ladders E06C7/12; props for mining E21D15/00) - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## 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. ## Claims ### Claim 1 A lift device comprising: a plurality of electrical components; a battery monitoring system comprising: a plurality of batteries configured to power the plurality of electrical components; and a controller configured to: obtain sensor data from the plurality of batteries; determine a state of charge of the plurality of batteries for open circuit conditions based on the sensor data; determine a state of charge of the plurality of batteries for load conditions based on the sensor data; determine a state of charge of the plurality of batteries for charging conditions based on the sensor data; and determine an overall state of charge of the plurality of 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. ### Claim 2 (depends on 1) The lift device of claim 1, wherein the controller 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. ### Claim 3 (depends on 1) The lift device of claim 1, wherein the controller 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 batteries. ### Claim 4 (depends on 3) The lift device of claim 3, wherein the controller is configured to operate the user device to provide at least one of the overall state of charge of the batteries, the state of charge of the batteries for open circuit conditions, the state of charge of the batteries for load conditions, or the state of charge of the batteries for charging conditions. ### Claim 5 (depends on 1) The lift device of claim 1, wherein the controller is further configured to determine a battery health of one or more of the plurality of batteries. ### Claim 6 (depends on 5) The lift device of claim 5, wherein the controller 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 batteries that causes the difference. ### Claim 7 (depends on 1) The lift device of claim 1, wherein the controller 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. ### Claim 8 A battery monitoring system for a device, the battery monitoring system comprising: a plurality of batteries configured to power a plurality of electrical components of the device; and a controller configured to: obtain sensor data from the plurality of batteries; determine a state of charge of the batteries for open circuit conditions based on the sensor data; determine a state of charge of the batteries for load conditions based on the sensor data; determine a state of charge of the batteries for charging conditions based on the sensor data; and determine 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. ### Claim 9 (depends on 8) The battery monitoring system of claim 8, wherein the controller 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. ### Claim 10 (depends on 8) The battery monitoring system of claim 8, wherein the controller 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 batteries. ### Claim 11 (depends on 10) The battery monitoring system of claim 10, wherein the controller is configured to operate the user device to provide at least one of the overall state of charge of the batteries, the state of charge of the batteries for open circuit conditions, the state of charge of the batteries for load conditions, or the state of charge of the batteries for charging conditions. ### Claim 12 (depends on 8) The battery monitoring system of claim 8, wherein the controller is further configured to determine a battery health of one or more of the plurality of batteries. ### Claim 13 (depends on 12) The battery monitoring system of claim 12, wherein the controller 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 batteries that causes the difference. ### Claim 14 (depends on 8) The battery monitoring system of claim 8, wherein the controller is further configured to determine a battery fluid level and a percent of fluid remaining in the battery relative to a maximum level. ### Claim 15 A method for monitoring batteries of a lift device, the method comprising: obtaining sensor data from a plurality of batteries of the lift device; determining an overall state of charge of the 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; and providing the overall state of charge of the plurality of batteries to a user device. ### Claim 16 (depends on 15) The method of claim 15, wherein the overall state of charge of the plurality of batteries is a weighted average 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 based, and the state of charge of the plurality of batteries for charging conditions. ### Claim 17 (depends on 15) 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. ### Claim 18 (depends on 15) The method of claim 15, further comprising determining a battery health of one or more of the plurality of batteries. ### Claim 19 (depends on 18) The method of claim 18, wherein the battery health is determined based on a plurality of equivalent series resistance values of the plurality of batteries, 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 batteries that causes the difference ### Claim 20 (depends on 18) The method of claim 18, further comprising: generating a report for the user device, the report comprising the overall state of charge of the plurality of batteries and the battery health of the plurality of batteries; and providing the report to the user device for display to a user.