Method for managing the operating range of a battery

Patent metadata

Field	Value
Publication number	US-10222428-B2
Application number	US-201515510083-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Sep 10, 2014
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

A method for managing an authorized operating range of a battery, the authorized operating range being limited between a minimum level and a maximum level of state of charge of the battery. The method includes estimating a state of health in power of the battery, the state of health in power characterizing capacity of the battery to supply a minimum required power level across an entirety of the operating range; and determining the minimum level of state of charge of the battery in accordance with the estimated state of health in power, the minimum level of state of charge being increased when the state of health in power decreases.

First claim

The invention claimed is:

1. A method for managing a permissible operating range of a battery, the permissible operating range being bounded between a minimum level and a maximum level of state of charge of the battery, the method comprising:
estimating a state of health in terms of power of the battery, the state of health in terms of power characterizing capacity of the battery to supply a required minimum power level over an entirety of the operating range;
determining the minimum level of state of charge of the battery as a function of the estimated state of health in terms of power, the minimum level of state of charge being increased when the state of health in terms of power decreases;
estimating a state of health in terms of energy of the battery, the state of health in terms of energy characterizing the capacity of the battery to supply a required minimum energy level over the entirety of the operating range; and
determining the maximum level of state of charge of the battery as a function of the estimated state of health in terms of energy of the battery, and increasing the maximum level of state of charge when the state of health in terms of energy decreases.

2. The method as claimed in claim 1 , further comprising determining the maximum level of state of charge of the battery as a function of the estimated state of health in terms of power of the battery, the maximum level of state of charge being increased when the state of health in terms of power decreases.

3. The method as claimed in claim 1 , further comprising reducing the minimum level of state of charge of the battery at a start of life of the battery.

4. The method as claimed in claim 1 , further comprising reducing the maximum level of state of charge of the battery at a start of life of the battery.

5. The method as claimed in claim 1 , wherein the estimating the state of health in terms of power of the battery includes comparing internal resistance of the battery at a given temperature and state of charge conditions with a value of the internal resistance in conditions when the battery is new.

6. A device for managing a permissible operating range of a battery, the permissible operating range being bounded between a minimum level and a maximum level of state of charge of the battery, the device comprising:
means for estimating a state of health in terms of power of the battery, the state of health in terms of power characterizing capacity of the battery to supply a required minimum power level over an entirety of the operating range;
processing means for determining the minimum level of state of charge of the battery as a function of the estimated state of health in terms of power, such that the minimum level of state of charge increases when the state of health in terms of power of the battery decreases; and
means for estimating the state of health in terms of energy of the battery, the state of health in terms of energy characterizing the capacity of the battery to supply the required minimum energy level over the entirety of the operating range,
wherein the processing means further determine the maximum level of state of charge of the battery as a function of the estimated state of health in terms of energy of the battery, such that the processing means increase the maximum level of state of charge when the state of health in terms of energy of the battery decreases.

7. The device as claimed in claim 6 , the processing means further for determining the maximum level of state of charge of the battery as a function of the estimated state of health in terms of power of the battery, such that the maximum level of state of charge increases when the state of health in terms of power of the battery decreases.

8. A motor vehicle comprising a battery and a device for managing the permissible operating range of the battery as claimed in claim 6 .

Assignees

• Renault Sas

Inventors

• Saint-Marcoux Antoine
• Delobel Bruno

Classifications

• H02J7/63

  against overdischarge · CPC title

• H02J7/61

  against overcharge · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• G01R31/3647

  for determining the ability of a battery to perform a critical function, e.g. cranking · CPC title

• B60L58/15

  Preventing overcharging · CPC title