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

Patent metadata

Field	Value
Publication number	US-2018194592-A1
Application number	US-201615741022-A
Country	US
Kind code	A1
Filing date	Jun 29, 2016
Priority date	Jul 1, 2015
Publication date	Jul 12, 2018
Grant date	—

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.

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 . The elevator system according to claim 1 , 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.

6 . 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.

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

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

9 . The method of claim 7 , wherein raising the temperature includes establishing a charging profile for the lithium-ion battery.

10 . The method of claim 6 , 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.

11 . 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.

12 . The battery operated elevator system according to claim 11 , further comprising: a heater operatively coupled to the controller and the lithium-ion battery for selectively raising a temperature of the lithium-ion battery.

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

• B66B1/302

  for energy saving · CPC title

• H01M10/443

  in response to temperature · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title