Construction Machine

Patent metadata

Field	Value
Publication number	US-2022274487-A1
Application number	US-201917260614-A
Country	US
Kind code	A1
Filing date	Jul 4, 2019
Priority date	Jul 19, 2018
Publication date	Sep 1, 2022
Grant date	—

Abstract

In a case of a normal operation, a battery controller (22) assumes a normal operation mode and permits charging and discharging of a battery module (21). Upon receiving a discharge command from a vehicle body controller (17) for completely discharging the battery module (21), the battery controller (22) assumes a discharge mode to discharge the battery module (21) to reach a safe voltage level and store discharge information. Upon reading out the discharge information, the battery controller (22) assumes a discharge prohibition mode to prohibit charging and discharging of the battery module (21).

First claim

1 . A construction machine comprising:
a hydraulic pump driven by an electric motor; a working mechanism driven by hydraulic oil delivered from the hydraulic pump; an inverter that controls the electric motor; an electricity storage device that is connected to the inverter to perform charging and discharging of electric power; and a battery controller that controls the charging and the discharging of the electricity storage device based upon a charge/discharge command from a vehicle body controller and stores information of the electricity storage device, characterized in that the battery controller: in a case of a normal operation, assumes a normal operation mode to permit the charging and the discharging of the electricity storage device; upon receiving a discharge command from the vehicle body controller for complete discharge of the electricity storage device, assumes a discharge mode to discharge the electricity storage device to reach a safety voltage level and store discharge information; and upon reading out the discharge information, assumes a discharge prohibition mode to prohibit the charging and the discharging of the electricity storage device.

2 . The construction machine according to claim 1 , wherein
the electricity storage device and the battery controller configure an exchangeable battery unit.

3 . The construction machine according to claim 1 , further comprising:
a switching device that connects or disconnects electrically between the inverter and the electricity storage device, wherein the battery controller blocks electrically between the inverter and the electricity storage device using the switching device in the discharge prohibition mode.

4 . The construction machine according to claim 1 , further comprising:
a monitor for displaying the discharge information.

Assignees

• Hitachi Construction Mach Co

Inventors

• Watanabe Toshihiko
• Ishida Seiji
• Takeuchi Ken

Classifications

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/855 Primary

  with circuits adapted for supplying loads from the battery · CPC title

• H01M10/48

  Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte (constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569) · CPC title

• Y02T10/62

  Hybrid vehicles · CPC title

• B60L53/80

  Exchanging energy storage elements, e.g. removable batteries · CPC title