BATTERY CONDITION MONITORING DEVICE

• US 20130338871A1
• Filed: 04/30/2013
• Published: 12/19/2013
• Est. Priority Date: 06/15/2012
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: MAEBARA, Tsuneo, KUBO, Shunichi
• Granted Patent: US 8,954,220 B2
• Time in Patent Office: Days
• US Class Current: 701/29.2
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0084 relating to control modules
• CPC Class Codes: B60L 3/0092 with use of redundant elements for safety purposes
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• CPC Class Codes: G01R 31/382 Arrangements for monitoring battery or accumulator variables, e.g. SoC
• 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
• 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 10/486 for measuring temperature
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 2310/40 The network being an on-board power network, i.e. within a vehicle
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/00309 Overheat or overtemperature protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/005 Detection of state of health [SOH]
• 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

A battery condition monitoring device has a control section for monitoring conditions of a high voltage battery on the basis of detection signals detected and transmitted by monitoring ICs. The control section has a main control section and a sub control section. When the main control section is in an abnormal condition, the sub control section detects the conditions of the high voltage battery, and instructs SMRs to turn on and off an electrical connection between the high voltage battery and a vehicle driving electric motor. The SMRs are arranged on connection lines through which the high voltage battery is connected to the vehicle driving electric motor.

Claims

1. A battery condition monitoring device for monitoring conditions of a battery capable of supplying electric power to a vehicle driving source mounted to a vehicle,

the battery condition monitoring device comprising:

a battery condition detecting section configured to detect conditions of the battery and output detection signals indicating the detected conditions of the battery;

a main control section configured to receive the detection signals transmitted from the battery condition detecting section, and detect whether or not the battery is in an abnormal condition on the basis of the received detection signals, and control an electrical connection state between the battery and the vehicle driving source on the basis of a detection result of the battery; and

a sub-control section configured to detect whether or not the main control section is in an abnormal condition, and control the electrical connection state between the battery and the vehicle driving source, the sub-control section, detecting whether or not the battery is in an abnormal condition on the basis of the detection signals transmitted from the battery condition detecting section when the detection result indicates that the main control section is in an abnormal condition, and control the electrical connection state between the battery and the vehicle driving source on the basis of the detection result of the high voltage battery.

2. The battery condition monitoring device according to claim 1, wherein the sub-control section has a self-diagnostic function for detecting a condition of the sub-control section, and

the sub-control section does not execute a control of the electrical connection state between the battery and the vehicle driving source when the detection result of the self-diagnostic function indicates that the sub-control section is in an abnormal condition even if the detection result indicates that the main control section is in an abnormal condition.

3. The battery condition monitoring device according to claim 1, wherein the main control section is configured to stop the operation thereof when receiving a reset signal, the sub-control section is configured to output the reset signal to the main control section, and the sub-control section is configured to output the reset signal to the main control section when the detection result indicates that the main control section is in an abnormal condition.

4. The battery condition monitoring device according to claim 2, wherein the main control section is configured to stop the operation thereof when receiving a reset signal, the sub-control section is configured to output the reset signal to the main control section, and the sub-control section is configured to output the reset signal to the main control section when the detection result indicates that the main control section is in an abnormal condition.

5. The battery condition monitoring device according to claim 1, wherein the sub-control section outputs to an upper side control section a signal indicating the detection result of the main control section when the detection result indicates that the main control section is in an abnormal condition, where the upper side control section controls an entire system of the vehicle.

6. The battery condition monitoring device according to claim 2, wherein the sub-control section outputs to an upper side control section a signal indicating the detection result of the main control section when the detection result indicates that the main control section is in an abnormal condition, where the upper side control section controls an entire system of the vehicle.

7. The battery condition monitoring device according to claim 1, wherein the main control section is configured to output a control signal to the battery condition detecting section, and

the battery condition detecting section is configured to detect whether or not the main control section is in an abnormal condition on the basis of the control signal transmitted to the main control section, and

the battery condition detecting section is configured to decide that the main control section is in an abnormal condition when the control signal transmitted from the main control section indicates an occurrence of an abnormal condition in the main control section.

8. The battery condition monitoring device according to claim 2, wherein the main control section is configured to output a control signal to the battery condition detecting section, and

the battery condition detecting section is configured to detect whether or not the main control section is in an abnormal condition on the basis of the control signal transmitted to the main control section, and

the battery condition detecting section is configured to decide that the main control section is in an abnormal condition when the control signal transmitted from the main control section indicates an occurrence of an abnormal condition in the main control section.

9. The battery condition monitoring device according to claim 1, wherein the main control section is configured to periodically output the control signal to the battery condition detecting section, and

the battery condition detecting section is configured to detect whether or not the main control section is in an abnormal condition on the basis of the control signal transmitted from the main control section, and to decide that the main control section is in an abnormal condition when receiving no control signal transmitted from the main control section for a predetermined time length.

10. The battery condition monitoring device according to claim 2, wherein the main control section is configured to periodically output the control signal to the battery condition detecting section, and

the battery condition detecting section is configured to detect whether or not the main control section is in an abnormal condition on the basis of the control signal transmitted from the main control section, and to decide that the main control section is in an abnormal condition when receiving no control signal transmitted from the main control section for a predetermined time length.

11. The battery condition monitoring device according to claim 7, wherein the battery condition detecting section is configured to output the detection signals to the main control section and the sub-control section, and select some specific detection signals from all of the detection signals when the detection result indicates that the main control section is in an abnormal condition as compared with the detection signals output when the main control section is in a normal condition without any trouble.

12. The battery condition monitoring device according to claim 9, wherein the battery condition detecting section is configured to output the detection signals to the main control section and the sub-control section, and select some specific detection signals from all of the detection signals when the detection result indicates that the main control section is in an abnormal condition as compared with the detection signals output when the main control section is in a normal operation without any trouble.

13. The battery condition monitoring device according to claim 1, wherein the battery condition detecting section is configured to output at least one of the detection signals indicating voltage information and temperature information of the battery to the sub-control section when the detection result indicates that the main control section is in an abnormal condition.

14. The battery condition monitoring device according to claim 2, wherein the battery condition detecting section is configured to output at least one of the detection signals indicating voltage information and temperature information of the battery to the sub-control section when the detection result indicates that the main control section is in an abnormal condition.

15. The battery condition monitoring device according to claim 1, wherein the battery is a high voltage battery comprised of a plurality of battery blocks, each of the battery blocks is comprised of a plurality of battery cells, and

the battery condition detecting section is comprised of a plurality of monitoring integrated circuits connected in a daisy chain connection, and the monitoring integrated circuits correspond to the battery blocks, respectively.

16. An electric power system to be mounted to a vehicle, comprising:

a battery configured to supply electric power to a vehicle driving source;

the battery monitoring device for monitoring conditions of the battery according to claim 1; and

system main relays arranged between the battery and the vehicle driving source in order to form the electrical connection between the battery and the vehicle driving source, and each of the main control section and the sub control section in the battery monitoring device instructs the system main relays to connect and disconnect the electrical connection between the battery and the vehicle driving source.