Lithium-ion battery charging system for a battery powered elevator system

Patent metadata

Field	Value
Publication number	US-10954100-B2
Application number	US-201615741022-A
Country	US
Kind code	B2
Filing date	Jun 29, 2016
Priority date	Jul 1, 2015
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

An elevator system includes at least one lithium-ion battery, a temperature sensor (56, 57) operatively coupled to the at least one lithium-ion battery (44), and a lithium-ion battery charging system (50) including a controller (30) having a central processing unit (CPU) (36) interconnected functionally via a system bus to the at least one lithium-ion battery (44) and the temperature sensor (56, 57). The controller (30) further includes at least one memory (38) device thereupon stored a set of instructions which, when executed by the CPU, causes the lithium-ion battery charging system (50) to determine an expected run mode for the elevator system, sense a temperature of the lithium-ion battery (44) through the temperature sensor (56, 57) establishing a sensed temperature, and establish a state of charge (SOC) for the lithium-ion battery based on the sensed temperature and expected run mode of the elevator system.

First claim

What is claimed is:

1. An elevator system comprising:
at least one lithium-ion battery;
a temperature sensor operatively coupled to the at least one lithium-ion battery; and
a lithium-ion battery charging system including a controller including a central processing unit (CPU) interconnected functionally via a system bus to the at least one lithium-ion battery and the temperature sensor, and at least one memory device thereupon stored a set of instructions which, when executed by the CPU, causes the lithium-ion battery charging system to:
determine an expected run mode for the elevator system;
sense a temperature of the lithium-ion battery through the temperature sensor establishing a sensed temperature; and
establish a state of charge (SOC) for the lithium-ion battery based on the sensed temperature and expected run mode of the elevator system;
wherein determining the expected run mode for the elevator system includes identifying one of an up-peak operating mode, a down-peak operating mode, and an off-peak operating mode;
wherein establishing the state of charge (SOC) for the lithium-ion battery based on the sensed temperature and expected run mode of the elevator system comprises selecting at least one of a first SOC, a second SOC and a third SOC for the lithium-ion battery based on the sensed temperature and expected run mode.

2. The elevator system according to claim 1 , wherein the set of instructions which, when executed by the CPU, causes the lithium-ion battery charging system to raise the temperature of the lithium-ion battery to a predetermined temperature level if the sensed temperature is below a desired temperature.

3. The elevator system according to claim 2 , wherein the set of instructions which, when executed by the CPU, causes the lithium-ion battery charging system to activate a heater to raise the temperature of the lithium-ion battery to the desired temperature.

4. The elevator system according to claim 2 , wherein the set of instructions which, when executed by the CPU, causes the lithium-ion battery charging system to establish a charging profile to raise the temperature of the lithium-ion battery to the desired temperature.

5. A method of charging a lithium-ion battery for an elevator system comprising:
determining an expected run mode for the elevator system;
sensing a temperature of the lithium-ion battery through the temperature sensor establishing a sensed temperature; and
establishing a state of charge (SOC) for the lithium-ion battery based on the sensed temperature and expected run mode of the elevator system;
wherein determining the expected run mode for the elevator system includes identifying one of an up-peak operating mode, a down-peak operating mode, and an off-peak operating mode;
wherein establishing the state of charge (SOC) for the lithium-ion battery based on the sensed temperature and expected run mode of the elevator system comprises selecting at least one of a first SOC, a second SOC and a third SOC for the lithium-ion battery based on the sensed temperature and expected run mode.

6. The method of claim 5 , further comprising: raising the temperature of the lithium-ion battery to a predetermined temperature level if the sensed temperature is below a desired temperature.

7. The method of claim 6 , wherein raising the temperature includes activating a heater operatively connected to the lithium-ion battery.

8. The method of claim 6 , wherein raising the temperature includes establishing a charging profile for the lithium-ion battery.

9. A battery operated elevator system comprising:
an elevator car;
a motor drive system operatively connected to the elevator car;
a lithium-ion battery operatively coupled to the motor drive system;
a temperature sensor operatively coupled to the lithium-ion battery; and
a controller operatively connected to the lithium-ion battery, the controller establishing a state of charge (SOC) for the lithium-ion battery based on a temperature sensed by the temperature sensor and an expected run mode of the elevator system;
wherein determining the expected run mode for the elevator system includes identifying one of an up-peak operating mode, a down-peak operating mode, and an off-peak operating mode;
wherein establishing the state of charge (SOC) for the lithium-ion battery based on the sensed temperature and expected run mode of the elevator system comprises selecting at least one of a first SOC, a second SOC and a third SOC for the lithium-ion battery based on the sensed temperature and expected run mode.

10. The battery operated elevator system according to claim 9 , further comprising: a heater operatively coupled to the controller and the lithium-ion battery for selectively raising a temperature of the lithium-ion battery.

11. An elevator system comprising:
at least one lithium-ion battery;
a temperature sensor operatively coupled to the at least one lithium-ion battery; and
a lithium-ion battery charging system including a controller including a central processing unit (CPU) interconnected functionally via a system bus to the at least one lithium-ion battery and the temperature sensor, and at least one memory device thereupon stored a set of instructions which, when executed by the CPU, causes the lithium-ion battery charging system to:
determine an expected run mode for the elevator system and establish a state of charge (SOC) for the lithium-ion battery with respect to the expected run mode of the elevator system;
wherein determining the expected run mode for the elevator system includes identifying one of an up-peak operating mode, a down-peak operating mode, and an off-peak operating mode; and
wherein the set of instructions, when executed by the CPU, further causes the lithium-ion battery charging system to:
sense a temperature of the lithium-ion battery or a temperature difference of the lithium-ion battery with respect to ambient temperature through the temperature sensor establishing a sensed temperature or temperature difference; and
establish the state of charge (SOC) for the lithium-ion battery with respect to the expected run mode of the elevator system based on the sensed temperature;
wherein with respect to the up-peak operation mode a high state of charge (SOC) is set for the lithium-ion battery in case the sensed temperature or temperature difference is above a desired temperature or temperature difference, and a medium state of charge (SOC) is set for the lithium-ion battery in case the sensed temperature or temperature difference is below the desired temperature or temperature difference;
wherein with respect to the off-peak operation mode a medium state of charge (SOC) is set for the lithium-ion battery in case the sensed temperature or temperature difference is above a desired temperature or temperature difference, and a low state of charge (SOC) is set for the lithium-ion battery in case the sensed temperature or temperature difference is below the desired temperature or temperature difference; and
wherein with respect to the down-peak operation mode a first low state of charge (SOC) is set for the lithium-ion battery in case the sensed temperature or temperature difference is above a desired temperature or temperature difference, and a second low state of charge (SOC) is set for the lithium-ion battery in case the sensed temperature or temperature difference is below the desired temperature or temperature difference.

Assignees

• Otis Elevator Co

Inventors

• Darling Robert Mason
• Smeltz Andrew

Classifications

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/977 Primary

  of the battery · CPC title

• H01M10/486

  for measuring temperature · CPC title

• B66B1/34 Primary

  Details {, e.g. call counting devices, data transmission from car to control system, devices giving information to the control system} · CPC title

• H02J7/04

  Regulation of charging current or voltage · CPC title