Wireless battery system, and wireless system

Patent metadata

Field	Value
Publication number	US-2018012484-A1
Application number	US-201615547141-A
Country	US
Kind code	A1
Filing date	Jan 22, 2016
Priority date	Jan 30, 2015
Publication date	Jan 11, 2018
Grant date	—

Abstract

There is provided a wireless battery system reconcilable with unsuccessful communication due to interference from an external wireless instrument or radio wave reflection or shielding under a surrounding physical environment. A wireless battery system allocates a cell controller to a cell, detects a cell state, and wirelessly communicates a cell state detected by a cell controller to a battery controller. During the wireless communication, the battery controller transmits a beacon to the cell controller and specifies a duration for radio wave environment measurement and a frequency to be measured as a condition. The cell controller performs radio wave environment measurement under the specified condition and then returns a measurement result along with the cell state to the battery controller.

First claim

1 . A wireless battery system that allocates a cell controller to a cell, detects a cell state, and wirelessly communicates a cell state detected by a cell controller to a battery controller,
wherein: during the wireless communication, the battery controller transmits a beacon to the cell controller and specifies a duration for radio wave environment measurement and a frequency to be measured as a condition and the cell controller performs radio wave environment measurement under the specified condition and then returns a measurement result along with the cell state to the battery controller.

2 . The wireless battery system according to claim 1 ,
wherein: a frequency to transmit the beacon and a frequency used for response to the battery controller is each assumed to be a base frequency, a frequency for radio wave environment measurement corresponds to a frequency as a base frequency candidate, and a new frequency selected from a frequency as a base frequency candidate is used as a base frequency to continue subsequent communication when a failure occurs on communication using a base frequency.

3 . The wireless battery system according to claim 2 ,
wherein: the battery controller transmits a signal at a frequency specified during the specified duration for radio wave environment measurement under the condition and the cell controller measures reception possibility and reception intensity of a signal at a frequency specified during the specified duration and responds to the battery controller.

4 . The wireless battery system according to claim 2 ,
wherein: the battery controller and the cell controller measure reception possibility and reception intensity of a signal at a frequency specified during the specified duration and respond to the battery controller for radio wave environment measurement under the condition.

5 . The wireless battery system according to claim 3 ,
wherein: the battery controller generates a frequency list specifying priorities in descending order of communication reliability corresponding to the specified frequency by using data representing reception possibility and reception intensity of a signal at the specified frequency and transmits the frequency list to the cell controller by using the beacon.

6 . The wireless battery system according to claim 5 ,
wherein: the wireless communication performs a sequence of processes from transmission from the battery controller to response from the cell controller within a specified period and continues a process at a specified period; and when unsuccessful communication successively occurs n times at the base frequency during the specified period, the battery controller restarts transmission of the beacon by selecting a highly prioritized frequency in the frequency list as a new base frequency.

7 . The wireless battery system according to claim 6 ,
wherein: when a failure to receive the beacon successively occurs at least n times during the specified period, the cell controller restarts reception of the beacon by selecting a highly prioritized frequency in the previously transmitted frequency list as a new base frequency.

8 . The wireless battery system according to claim 1 ,
wherein: the wireless communication performs a sequence of processes from transmission from the battery controller to response from the cell controller within a specified period and continues a process at a specified period; and the specified period includes a slot indicating the beginning of a period for data communication, at least one slot for data communication, and at least one slot to measure radio wave environment, and a beginning slot for a data communication period and a slot for data communication are configured as the same frequency and a slot for radio wave environment measurement is configured as one of a frequency equal to a frequency for data communication and a frequency different from a frequency for data communication.

9 . The wireless battery system according to claim 8 ,
wherein: the slot indicating the beginning of a period for data communication specifies a period for the radio wave environment measurement and a frequency to be measured as a condition, at least one slot to measure the radio wave environment performs radio wave environment measurement under the specified condition, and at least one slot for the data communication returns a measurement result and the cell state to the battery controller.

10 . The wireless battery system according to claim 1 ,
wherein: a battery controller and a cell controller measure radio wave environment for each frequency in a communication frequency band at the time to initially start a wireless battery system, generate a list of frequencies in order of one of favorable radio wave environments and unfavorable radio wave environments, and specify a frequency for communication based on the list.

11 . A wireless system that wirelessly communicates a first controller to collect data and data detected by a first controller to a second controller,
wherein: during the wireless communication, the second controller transmits a beacon to the first controller and specifies a duration for radio wave environment measurement and a frequency to be measured as a condition the first controller performs radio wave environment measurement under the specified condition and then returns a measurement result along with the cell state to the second controller.

12 . The wireless system according to claim 11 ,
wherein: a frequency to transmit the beacon and a frequency used for response to the second controller is each assumed to be a base frequency, a frequency for radio wave environment measurement corresponds to a frequency as a base frequency candidate, and a new frequency selected from a frequency as a base frequency candidate is used as a base frequency to continue subsequent communication when a failure occurs on communication using a base frequency.

13 . The wireless battery system according to claim 4 ,
wherein: the battery controller generates a frequency list specifying priorities in descending order of communication reliability corresponding to the specified frequency by using data representing reception possibility and reception intensity of a signal at the specified frequency and transmits the frequency list to the cell controller by using the beacon.

14 . The wireless battery system according to claim 13 ,
wherein: the wireless communication performs a sequence of processes from transmission from the battery controller to response from the cell controller within a specified period and continues a process at a specified period; and when unsuccessful communication successively occurs n times at the base frequency during the specified period, the battery controller restarts transmission of the beacon by selecting a highly prioritized frequency in the frequency list as a new base frequency.

15 . The wireless battery system according to claim 14 ,
wherein: when a failure to receive the beacon successively occurs at least n times during the specified period, the cell controller restarts reception of the beacon by selecting a highly prioritized frequency in the previously transmitted frequency list as a new base frequency.

Assignees

• Hitachi Chemical Co Ltd

Inventors

• Sakabe Kei
• Yamazoe Takanori
• Arita Hiroshi

Classifications

• H04W72/54

  based on quality criteria · 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

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/44

  between battery management systems and power sources · CPC title

• G08C2200/00

  Transmission systems for measured values, control or similar signals · CPC title