Storage battery management system, vehicle, and server device

Patent metadata

Field	Value
Publication number	US-12545145-B2
Application number	US-202218551561-A
Country	US
Kind code	B2
Filing date	Mar 11, 2022
Priority date	Mar 26, 2021
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

A system is provided with which data on the internal state of a storage battery such as SOC-OCV characteristics and FCC can be obtained with high accuracy and highly accurate estimation is possible even in the case of repeating charging and discharging for a long period. The storage battery management system includes a vehicle that includes a unit enabling data transmission and reception; the vehicle includes a storage battery, a balancing circuit electrically connected to the storage battery, and a vehicle control unit having a function of controlling the balancing circuit; the storage battery includes an assembled battery including a plurality of battery cells; the vehicle control unit has a function of selecting an estimated value that most closely shows a state of each of the battery cells included in the assembled battery; and the balancing circuit has a function of being controlled in accordance with the selected estimated value.

First claim

The invention claimed is:

1 . A storage battery management system comprising a server device and a vehicle, wherein the vehicle comprises:
a storage battery comprising an assembled battery comprising a plurality of battery cells; a balancing circuit electrically connected to the plurality of battery cells; and a vehicle control unit comprising a CPU and a communication portion, wherein the server device is configured to receive first data on internal states of the plurality of battery cells transmitted from the communication portion, calculate a plurality of estimated values in accordance with the first data, and transmit second data including the plurality of estimated values to the communication portion, wherein the CPU is configured to select an estimated value that shows a state of each of the plurality of battery cells from the plurality of estimated values, and wherein the balancing circuit is configured to equalize SOC of the plurality of battery cells in accordance with the selected estimated value.

2 . A storage battery management system comprising a server device and a vehicle,
wherein the vehicle comprises:
a storage battery comprising an assembled battery comprising a plurality of battery cells;
a balancing circuit comprising a plurality of circuits, the plurality of circuits electrically connected to the plurality of battery cells; and
a vehicle control unit comprising a CPU and a communication portion,
wherein the server device is configured to calculate a plurality of estimated values in accordance with first data on an internal state of the assembled battery that is transmitted from the communication portion and transmit second data including the plurality of estimated values to the communication portion, wherein the CPU is configured to select an estimated value that shows a state of each of the plurality of battery cells from the plurality of estimated values, and wherein the balancing circuit is configured to be controlled equalize SOC of the plurality of battery cells in accordance with the selected estimated value.

3 . The storage battery management system according to claim 2 , wherein the first data comprises successive data on the internal state of the assembled battery.

4 . The storage battery management system according to claim 3 , wherein the successive data comprises an SOC-OCV characteristic.

5 . The storage battery management system according to claim 3 , wherein the successive data comprises internal resistance.

6 . The storage battery management system according to claim 5 ,
wherein the internal resistance comprises a resistance component R 1 with a first response speed and a resistance component R 2 with a second response speed, and wherein the first response speed is faster than the second response speed.

7 . The storage battery management system according to claim 6 , wherein the server device is configured to predict changes in the resistance component R 1 and the resistance component R 2 with LSTM (Long Short-Term Memory).

8 . A vehicle comprising:
a storage battery comprising an assembled battery comprising a plurality of battery cells; a balancing circuit comprising a plurality of circuits, the plurality of circuits electrically connected to the plurality of battery cells; and a vehicle control unit comprising a CPU and a communication portion, wherein the communication portion is configured to transmit first data on internal states of the plurality of battery cells to a server device and receive second data including a plurality of estimated values from the server device, wherein the CPU is configured to select an estimated value that shows a state of each of the plurality of battery cells from the plurality of estimated values, and wherein the balancing circuit is configured to equalize SOC of the plurality of battery cells in accordance with the selected estimated value.

9 . The vehicle according to claim 8 , wherein the first data comprises successive data on an internal state of the assembled battery that is transmitted from the vehicle.

10 . The vehicle according to claim 9 , wherein the successive data comprises an SOC-OCV characteristic.

11 . The vehicle according to claim 9 , wherein the successive data comprises internal resistance.

12 . The vehicle according to claim 11 ,
wherein the internal resistance comprises a resistance component R 1 with a first response speed and a resistance component R 2 with a second response speed, and wherein the first response speed is faster than the second response speed.

13 . The vehicle according to claim 11 , wherein the internal resistance comprises a measured value of each of the plurality of battery cells.

14 . The vehicle according to claim 11 configured to measure the internal resistance by a current-rest-method.

15 . The storage battery management system according to claim 1 , wherein the first data comprises successive data on an internal state of the assembled battery.

16 . The storage battery management system according to claim 15 , wherein the successive data comprises an SOC-OCV characteristic.

17 . The storage battery management system according to claim 15 , wherein the successive data comprises internal resistance.

18 . The storage battery management system according to claim 17 ,
wherein the internal resistance comprises a resistance component R 1 with a first response speed and a resistance component R 2 with a second response speed, and wherein the first response speed is faster than the second response speed.

19 . The storage battery management system according to claim 18 , wherein the server device is configured to predict changes in the resistance component R 1 and the resistance component R 2 with LSTM.

Assignees

• Semiconductor Energy Lab

Inventors

• Osada Takeshi
• Inoue Noboru
• Katagiri Haruki
• Tsukamoto Yosuke
• Mikami Mayumi
• Tanemura Kazuki
• Sasaki Kousuke

Classifications

• H02J7/52

  for charge balancing, e.g. equalisation of charge between batteries · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M2010/4278

  Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller · CPC title

• H01M2010/4271

  Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing · CPC title

• H01M10/425

  Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing (printed circuits H05K1/00) · CPC title