Method and device for controlling the operating point of a battery

• US 8,294,416 B2
• Filed: 05/17/2006
• Issued: 10/23/2012
• Est. Priority Date: 10/28/2005
• Status: Expired due to Fees

• Current Assignee: Conti Temic Microelectronic GmbH (Continental AG)
• Original Assignee: Conti Temic Microelectronic GmbH (Continental AG)
• Inventors: Birke, Peter, Keller, Michael, Malik, Manfred
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US12/091,315
• Publication Number:
  US 20080284378A1
• Time in Patent Office: 2,351 Days
• Field of Search: 320/107
• US Class Current: 320/107
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• 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 58/24 for controlling the temperature of batteries
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/30 Nickel accumulators H01M10/34 takes precedence
• CPC Class Codes: H01M 10/345 Gastight metal hydride accumulators
• CPC Class Codes: H01M 10/44 Methods for charging or discharging circuits for charging H02J7/00
• CPC Class Codes: H01M 10/443 in response to temperature
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

Disclosed is a method for controlling the operating point (AP, AP1, AP2) of a battery (1), such as a lithium ion battery, a nickel metal hydride battery or a lithium polymer battery. The charging state (SoC1, SoC2) of the battery (1) is recorded as a state variable which determines the current operating point (AP1, AP2) of the battery (1). The current operating point (AP1, AP2) is set by a corresponding set value (SoC_AP1, SoC_AP2) for the charging state (SoC1, SoC2) which is continuously adjusted depending on the temperature (T) and/or on the age state (SoH) of the battery.

Claims

1. A method for controlling the operating point(AP, AP1, AP2) of a battery (1), such as alithium ion battery, a nickel metal hydride battery, or a lithium polymer battery, the method comprising:

recording a charging state (SoC1, SoC2) of the battery (1) as a state variable,

setting corresponding operating points (AP1, AP2) by means of corresponding set values (SoC_AP1, SoC_AP2) for the charging state (SoC1, SoC2), the corresponding set values (SoC_AP1, SoC_AP2) are continuously adjusted depending on a temperature (T) and an age state (SoH).

2. A method according to claim 1, wherein which the current set value (SoC_AP1, SoC_Ap2) is adapted for the charging state (SoC1, SoC2) on the basis of a specified temperature-dependent characteristic curve (KI).

3. A method according to claim 1, wherein the current charging state (SoC1, SoC2) of the battery (1) is determined on the basis of a measurement,of the battery current and the charge which is absorbed or removed.

4. A method according to claim 1, wherein the current charging state (SoC1, SoC2) is determined based on at least one of an open-circuit voltage measurement method and a model-based estimation method.

5. A method according to claim 1, wherein at least one of an ambient temperature, a battery temperature, and a cell temperature is recorded as the temperature (T).

6. A method according to claim 1, wherein the current set value (SoC_AP1, SoC_AP2) for the charging state (SoC1, SoC2) is adapted by means of an age-dependent correction factor (SoC_corr) and on the basis of a specified second.

7. A method according to claim 6, wherein the age-dependent correction factor (SoC_corr)is determined on the basis of a model-based estimation method for the capacity and power rating of the battery (1).

8. A method according to claim 6, wherein an age state (SoH) of the battery (1) is determined based on at least one of a voltage measurement method, a current measurement method and model-based estimation method.

9. A method according to claim 6, wherein when the adapted set value (SoC_Ap2) for the charging state (SoC2) is not reachd by the current charging state value, a compensation charge is conducted.

10. A method according to claim 9, wherein after the compensation charge has been completed, the age-dependent correction factor (SoC_corr) is set to a value greater than 1.

11. A device for conducting a method for controlling on operating point (AP, AP1, AP2) of a battery (1), such as a lithium ion battery, a nickel metal hydride battery, or a lithium polymer battery, the device comprising:

at least one processor which is part of a control device (4), wherein the processor is used so that an operating point (AP1, AP2) of the battery (1) can be set continuously using a set value for the charging state (SOC1, SOC2) which is dynamically adjusted based on at least one of a temperature (T) and an age state (SoH) of the battery (1).