Charge control apparatus and charge control method

Patent metadata

Field	Value
Publication number	US-9608468-B2
Application number	US-201114349406-A
Country	US
Kind code	B2
Filing date	Oct 4, 2011
Priority date	Oct 4, 2011
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

ECU executes program including the steps of turning on an overcharge tentative determination flag and performing limitation on Win in a case where a rising rate ΔTB is higher than or equal to ΔTB(0), and a current average value IBs is a value on a side of charging, and the steps of turning off the overcharge tentative determination flag and cancelling the limitation on Win in a case where the rising rate ΔTB is lower than or equal to ΔTB(1), or the current average value IBs exhibits a value on a side of discharging, and the steps of determining that a battery is in the overcharging state and executing a fail safe process in a case where the integrated value IBs of current from a time point at which the overcharge tentative determination flag is switched from an off-state to an on-state becomes greater than or equal to IBs(0).

First claim

The invention claimed is:

1. A charge control apparatus for controlling charging of an electrical storage device for supplying power to electric equipment, the charge control apparatus comprising:
a detection device for detecting a temperature of said electrical storage device; and
a control device for lowering an upper limit value of charging power of said electrical storage device when the temperature of said electrical storage device rises due to charging of said electrical storage device, and determining that said electrical storage device is in an overcharging state when charging continues in a state where said upper limit value is lowered, and a rise in the temperature of said electrical storage device continues,
wherein, based upon a rising rate of the temperature of said electrical storage device being higher than a first threshold value, said control device sets said upper limit value of said charging power to be lower as compared to a case where said rising rate is lower than said first threshold value, and
when the temperature of said electrical storage device is high said control device sets said first threshold value so that said first threshold value is higher as compared to an instance where a temperature of said electrical storage device is low.

2. The charge control apparatus according to claim 1 , wherein
said detection device detects temperatures at a plurality of parts of said electrical storage device, and
said control device lowers said upper limit value of said charging power when said rising rate of a temperature at any one part among the plurality of parts is higher than said first threshold value.

3. The charge control apparatus according to claim 1 , wherein when charging continues until an integrated value of a current to said electrical storage device becomes greater than a predetermined value after said upper limit value of said charging power is lowered, and the rising rate of the temperature of said electrical storage device does not become lower than a second threshold value, said control device determines that said electrical storage device is in said overcharging state, and
said second threshold value is a value less than or equal to said first threshold value.

4. The charge control apparatus according to claim 3 , wherein in at least any one of a case where said rising rate is lower than said second threshold value and a case where said electrical storage device is discharging, said control device cancels lowering of said upper limit value of said charging power.

5. The charge control apparatus according to claim 1 , wherein when said control device determines that said electrical storage device is in said overcharging state, said control device stops charging of said electrical storage device.

6. The charge control apparatus according to claim 1 , wherein
said electrical storage device is provided with a cooling device for cooling said electrical storage device, and
when said cooling device is in operation in a case where a temperature of said electrical storage device rises due to charging of said electrical storage device, said control device does not change an operation amount of said cooling device while said upper limit value is lowered.

7. The charge control apparatus according to claim 1 , wherein said electrical storage device is provided with a cooling device for cooling said electrical storage device, and
when operation of said cooling device is started, said control device does not determine on whether or not said electrical storage device is in said overcharging state.

8. The charge control apparatus according to claim 1 , wherein when the temperature of said electrical storage device rises due to charging of said electrical storage device, said control device lowers said upper limit value of said charging power and lowers an upper limit value of discharging power of said electrical storage device.

9. The charge control apparatus according to claim 1 , wherein
said charge control apparatus is mounted to a vehicle having an electric motor for driving, and
said electrical storage device provides power to and receives power from said electric motor for driving.

10. A charge control method of controlling charging of an electrical storage device for supplying power to electric equipment, the charge control method comprising the steps of:
lowering an upper limit value of charging power of said electrical storage device when a temperature of said electrical storage device rises due to charging of said electrical storage device; and
determining that said electrical storage device is in an overcharging state when charging continues in a state where said upper limit value is lowered, and a rise in the temperature of said electrical storage device continues,
wherein, based upon a rising rate of the temperature of said electrical storage device being higher than a first threshold value, setting said upper limit value of said charging power to be lower as compared to a case where said rising rate is lower than said first threshold value, and
when the temperature of said electrical storage device is high, setting said first threshold value so that said first threshold value is higher as compared to an instance where a temperature of said electrical storage device is low.

Assignees

• Kikuchi Yoshiaki
• Kubo Masahiko
• Hiroe Yoshihiko
• Okumura Motoyoshi
• Nakamura Kimihito
• Kawamura Hideki
• Toyota Motor Co Ltd

Inventors

• Kikuchi Yoshiaki
• Kubo Masahiko
• Hiroe Yoshihiko
• Okumura Motoyoshi
• Nakamura Kimihito
• Kawamura Hideki

Classifications

• B60L58/26

  by cooling · CPC title

• B60L58/13

  Maintaining the SoC within a determined range · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/947

  in response to integrated charge or discharge current · CPC title

• H02J7/663

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title