BATTERY CONTROLLER

• US 20150369873A1
• Filed: 02/05/2013
• Published: 12/24/2015
• Est. Priority Date: 02/05/2013
• Status: Active Grant

• Current Assignee: Vehicle Energy Japan, Inc.
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: NAKAO, Ryohei, KAWAHARA, Yohei, KUDOU, Akihiko, OOKAWA, Keiichiro, IGARASHI, Naoyuki
• Granted Patent: US 9,952,288 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health
• CPC Class Codes: G01R 31/396 Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

Provided is a battery control device which can verify a probability of a state of charge or a state of health of a battery. A battery controller according to the invention calculates a measurement parameter of the battery using the state of charge or the state of health of the battery, and the probability of the state of charge or the state of health is diagnosed by comparing the measurement results (see FIGS. 9(a) and 9(b)).

Claims

1. A battery controller that controls an operation of a battery, comprising:

a state calculation unit configured to calculate a state of charge and a state of health of the battery;

a parameter calculation unit configured to calculate a measurement parameter of the battery using the state of charge or the state of health of the battery calculated by the state calculation unit; and

a diagnosis unit configured to diagnose a probability of the state of charge or the state of health of the battery calculated by the state calculation unit,

wherein the diagnosis unit diagnoses the probability of the state of charge or the state of health of the battery calculated by the state calculation unit by comparing the measurement parameter of the battery calculated by the parameter calculation unit with a measurement value, and outputs a diagnosis result.

2. The battery controller according to claim 1, further comprising a voltage detection unit configured to detect a both-end voltage of the battery,

wherein the parameter calculation unit calculates the both-end voltage of the battery using the state of charge and the state of health of the battery calculated by the state calculation unit, and

the diagnosis unit diagnoses the probability of the state of charge or the state of health of the battery calculated by the state calculation unit by comparing the both-end voltage of the battery calculated by the parameter calculation unit with the both-end voltage of the battery detected by the voltage detection unit.

3. The battery controller according to claim 2,

wherein the diagnosis unit is configured to,

at the time of discharging of the battery,

diagnose that the state of health of the battery is calculated as being small in a case where the both-end voltage of the battery calculated by the parameter calculation unit is larger than the both-end voltage of the battery detected by the voltage detection unit by a predetermined threshold or more, and

diagnose that the state of health of the battery is calculated as being large in a case where the both-end voltage of the battery calculated by the parameter calculation unit is smaller than the both-end voltage of the battery detected by the voltage detection unit by the predetermined threshold or more, and

at the time of charging of the battery,

diagnose that the state of health of the battery is calculated as being large in a case where the both-end voltage of the battery calculated by the parameter calculation unit is larger than the both-end voltage of the battery detected by the voltage detection unit by the predetermined threshold or more, and

diagnose that the state of health of the battery is calculated as being small in a case where the both-end voltage of the battery calculated by the parameter calculation unit is smaller than the both-end voltage of the battery detected by the voltage detection unit by the predetermined threshold or more.

4. The battery controller according to claim 1, further comprising:

a voltage detection unit configured to detect a both-end voltage of the battery; and

a current detection unit configured to detect a current flowing in the battery,

wherein the diagnosis unit diagnoses the probability of the state of charge or the state of health of the battery calculated by the state calculation unit by comparing a resultant both-end voltage of the battery calculated by the parameter calculation unit in a case where an allowable charge current or an allowable discharge current flows in the battery with the both-end voltage of the battery detected by the voltage detection unit in a case where the allowable charge current or the allowable discharge current flows in the battery.

5. The battery controller according to claim 4,

wherein the diagnosis unit is configured to

diagnose that the state of health of the battery is calculated as being small in a case where a variation amount of the both-end voltage of the battery detected by the voltage detection unit exceeds a variation amount of the both-end voltage of the battery calculated by the parameter calculation unit by a predetermined threshold or more in a period where the parameter calculation unit calculates the both-end voltage of the battery corresponding to a case where the allowable charge current or the allowable discharge current flows in the battery, and

diagnose that the state of health of the battery is calculated as being large in a case where the variation amount of the both-end voltage of the battery detected by the voltage detection unit is lower than the variation amount of the both-end voltage of the battery calculated by the parameter calculation unit by the predetermined threshold or more in a period where the parameter calculation unit calculates the both-end voltage of the battery corresponding to a case where the allowable charge current or the allowable discharge current flows in the battery.

6. The battery controller according to claim 1,

wherein the diagnosis unit diagnoses that the state of health of the battery is calculated as being small in a case where the both-end voltage of the battery calculated by the parameter calculation unit is smaller than the both-end voltage of the battery detected by the voltage detection unit when the battery is charged or discharged.

7. The battery controller according to claim 1, further comprising a current detection unit configured to detect a current flowing in the battery,

wherein the diagnosis unit is configured to

diagnose the probability of the state of charge of the battery calculated by the state calculation unit in a case where the current does not flow in the battery, or the current flowing in the battery is equal to or less than a predetermined threshold so as to be considered as no current flowing in the battery, and

diagnose the probability of the state of health of the battery calculated by the state calculation unit in a case where the battery is charged or discharged.

8. The battery controller according to claim 1, further comprising a temperature detection unit configured to detect a temperature of the battery,

wherein the parameter calculation unit calculates an internal temperature of the battery using the state of charge and the state of health of the battery calculated by the state calculation unit, and

the diagnosis unit diagnoses the probability of the state of charge or the state of health of the battery calculated by the state calculation unit by comparing the internal temperature of the battery calculated by the parameter calculation unit with the internal temperature of the battery calculated based on the temperature of the battery detected by the temperature detection unit.

9. The battery controller according to claim 8,

wherein the diagnosis unit is configured to, at the time of charging of the battery,

diagnose that the state of health of the battery is calculated as being large in a case where the internal temperature of the battery calculated by the parameter calculation unit is larger than the internal temperature of the battery calculated based on the temperature of the battery detected by the temperature detection unit by a predetermined threshold or more, and

diagnose that the state of health of the battery is calculated as being small in a case where the internal temperature of the battery calculated by the parameter calculation unit is smaller than the internal temperature of the battery calculated using the current flowing in the battery detected by the current detection unit by the predetermined threshold or more.

10. The battery controller according to claim 1, further comprising:

a voltage detection unit configured to detect a both-end voltage of the battery; and

a current detection unit configured to detect a current flowing in the battery,

wherein the diagnosis unit is configured to,

in a case where the state of charge or the state of health of the battery calculated by the state detection unit is not correct,

acquire a first magnitude relation indicating a larger one of the both-end voltage of the battery calculated by the parameter calculation unit and an open circuit voltage of the battery, and a second magnitude relation indicating a larger one of the both-end voltage of the battery detected by the voltage detection unit and the open circuit voltage of the battery, and

diagnose that the state of charge or the state of health of the battery calculated by the state detection unit is incorrect based on a displacement between a detection timing of the current detection unit and a detection timing of the voltage detection unit in a case where the magnitude relation indicated by the first magnitude relation is inverted to the magnitude relation indicated by the second magnitude relation, and output a diagnosis result thereof.