Method for managing the operating range of a battery

• US 10,222,428 B2
• Filed: 09/02/2015
• Issued: 03/05/2019
• Est. Priority Date: 09/10/2014
• Status: Active Grant

• Current Assignee: Renault Sas (Renault)
• Original Assignee: Renault Sas (Renault)
• Inventors: Saint-Marcoux, Antoine, Delobel, Bruno
• Primary Examiner(s): Riyami, Abdullah
• Assistant Examiner(s): Alhawamdeh, Nader
• Application Number:
  US15/510,083
• Publication Number:
  US 20170299660A1
• Time in Patent Office: 1,280 Days
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/42 by adaptive correction
• CPC Class Codes: B60L 2260/44 by parameter estimation
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60R 16/033 characterised by the use of electrical cells or batteries for propulsion puposes B60K1/04; supplying batteries to, or removing batteries from, vehicles B60S5/06; testing of charge state G01R31/36
• CPC Class Codes: G01R 31/3647 for determining the ability of a battery to perform a critical function, e.g. cranking
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/388 involving voltage measurements
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: H01M 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H01M 10/425 : Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing printed circuits H05K1/00
• CPC Class Codes: H01M 10/44 : Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/48 : 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 Class Codes: H01M 2010/4271 : Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
• CPC Class Codes: H01M 2220/20 : Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 7/00 : Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/0029 : with safety or protection devices or circuits
• CPC Class Codes: H02J 7/00302 : Overcharge protection
• CPC Class Codes: H02J 7/00306 : Overdischarge protection
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

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.

Claims

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.