Systems and methods for battery charge control

Patent metadata

Field	Value
Publication number	US-2019181652-A1
Application number	US-201616076031-A
Country	US
Kind code	A1
Filing date	Feb 17, 2016
Priority date	Feb 17, 2016
Publication date	Jun 13, 2019
Grant date	—

Abstract

A charging control system for a battery includes temperature sensing means configured to provide temperature value associated with the battery, voltage sensing means configured to provide a battery's voltage value, pressure sensing means configured to provide the battery's internal portion pressure value, and a controller. The controller is configured to determine a threshold pressure change associated with a full charge of the battery based on map data selected from a predetermined data map associated with the battery monitor, during the charging process, a present voltage value obtained by the voltage sensing means and a total pressure change based on a present pressure value obtained by the pressure sensing means, continue the charging process when the present voltage value exceeds an upper limit voltage value, and total pressure change is less than threshold pressure change and terminate the charging process when the present voltage value exceeds the upper limit voltage value

First claim

1 - 21 . (canceled)

22 . A charging control system for a battery, comprising:
a temperature sensor configured to provide a temperature value associated with the battery; a voltage sensor configured to provide a voltage value associated with the battery; a pressure sensor configured to provide a pressure value associated with an internal portion of the battery; and a controller configured to:
determine, before a charging process is started, a threshold pressure change associated with a full charge of the battery based on map data selected from a predetermined data map associated with the battery;
monitor, during the charging process, a present voltage value obtained by the voltage sensor and a total pressure change based on a present pressure value obtained by the pressure sensor;
continue the charging process when the present voltage value exceeds an upper limit voltage value, and the total pressure change is less than the threshold pressure change; and
terminate the charging process when the present voltage value exceeds the upper limit voltage value, and the total pressure change is greater than or equal to the threshold pressure change.

23 . The charging control system according to claim 22 , wherein the selection of the map data is based on a pre-charging temperature value obtained from the temperature sensor, a pre-charging voltage value obtained from the voltage sensing means, and a pre-charging pressure value obtained from the pressure sensor.

24 . The charging control system according to claim 22 , wherein the controller is configured to increase the upper limit voltage value when the present voltage value exceeds the upper limit voltage value, and the total pressure change is less than the threshold pressure change.

25 . The charging control system according to claim 22 , wherein the controller is further configured to compensate for creep in one or more portions of the battery by modifying the selected map data based on an initial internal pressure measurement, the pre-charging process pressure value, and the pre-charging temperature value.

26 . The charging control system according to claim 25 , wherein the controller is configured to compare the initial internal pressure measurement and the pre-charging pressure value, and when the initial internal pressure measurement is greater than the pre-charging process pressure value, select new map data associated with the pre-charging pressure value.

27 . The charging control system according to claim 26 , wherein the predetermined map comprises a collection of experimentally measured internal pressures, open circuit voltages, and temperatures of a representative battery under representative conditions of use of the battery.

28 . The charging control system according to claim 22 , wherein the pressure sensor comprises at least one tactile sensor embedded in the battery.

29 . The charging control system according to claim 28 , wherein the at least one tactile sensor is positioned parallel to a laminated direction of a battery cell of the battery.

30 . The charging control system according to claim 22 , further comprising a state of charge sensor configured to determine a state of charge of the battery.

31 . The charging control system according to claim 22 , wherein the voltage sensor comprises a dummy cell connected to one or more battery packs associated with the battery.

32 . The charging control system according to claim 22 , wherein the voltage value is an open circuit voltage of the battery.

33 . The charging control system according to claim 22 , wherein the battery comprises at least one of a lithium-ion solid-state battery and a lithium-ion liquid electrolyte battery.

34 . A vehicle comprising the charging control system according to claim 22 .

35 . A method for charging a battery, comprising:
determining a temperature value associated with the battery; determining a voltage value associated with the battery; determining a pressure value associated with an internal portion of the battery; determining, before a charging of the battery is started, a threshold pressure change associated with a full charge of the battery based on map data selected from a predetermined data map associated with the battery; charging the battery; monitoring, during the charging, a present voltage value obtained by the voltage sensor and a total pressure change based on a present pressure value obtained by the pressure sensor; continuing the charging when the present voltage value exceeds an upper limit voltage value, and the total pressure change is less than the threshold pressure change; and terminating the charging when the present voltage value exceeds the upper limit voltage value, and the total pressure change is greater than or equal to the threshold pressure change.

36 . The method according to claim 35 , wherein the selection of the map data is based on a pre-charging temperature value obtained from the temperature sensor, a pre-charging voltage value obtained from the voltage sensor, and a pre-charging pressure value obtained from the pressure sensor.

37 . The method according to claim 35 , comprising increasing the upper limit voltage value when the present voltage value exceeds the upper limit voltage value, and the total pressure change is less than the threshold pressure change.

38 . The method according to claim 35 , comprising compensating for creep in one or more portions of the battery by modifying the selected map data based on an initial internal pressure measurement, the pre-charging process pressure value, and the pre-charging temperature value.

39 . The method according to claim 38 , comprising comparing the initial internal pressure measurement and the pre-charging pressure value; and
when the initial internal pressure measurement is greater than the pre-charging process pressure value, selecting new map data associated with the pre-charging pressure value.

40 . The method according to claim 39 , wherein the predetermined map comprises a collection of experimentally measured internal pressures, open circuit voltages, and temperatures of a representative battery under representative conditions of use of the battery.

41 . The method according to claim 35 , comprising determining a state of charge of the battery and modifying the threshold pressure change based on the state of charge of the battery before the charging is started.

42 . The method according to claim 35 , wherein the battery comprises at least one of a lithium-ion solid-state battery and a lithium-ion liquid electrolyte battery.

Assignees

• Toyota Motor Europe

Inventors

• Komiyama Keita
• Katoh Yuki

Classifications

• H02J7/65

  against overtemperature · CPC title

• H02J7/975

  in response to temperature · CPC title

• H02J7/973

  in response to degree of gas development in the battery · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/14 Primary

  for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle · CPC title