BATTERY MANAGEMENT DEVICE AND POWER SUPPLY SYSTEM

• US 20200130509A1
• Filed: 01/02/2020
• Published: 04/30/2020
• Est. Priority Date: 04/27/2015
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: TAKAO, Hiroshi, KOBAYASHI, Noriharu, OKADA, Hoshihito
• Granted Patent: US 11,220,183 B2
• Time in Patent Office: Days
• CPC Class Codes: B60L 2240/54 related to batteries
• 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 2250/10 by alarm
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/24 for controlling the temperature of batteries
• 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 10/48 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: H01M 50/569 Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals battery terminal connectors with integrated measuring arrangements G01R31/364
• CPC Class Codes: H02J 1/06 Two-wire systems
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: H02J 7/0031 using battery or load disconnect circuits H02J9/002 takes precedence
• 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 driver controls a switch inserted in a current path between a secondary battery and an inverter that drives a motor. A first abnormality detector instructs the driver to turn off the switch when an abnormality of the secondary battery is detected. A second abnormality detector is disposed in parallel with the first abnormality detector, and instructs the driver to turn off the switch when the abnormality of the secondary battery is detected. The first abnormality detector suspends an instruction to turn off the switch to the driver, even when the abnormality of the secondary battery is detected, in cases where an ECU instructs discharge-stop prohibition of the secondary battery. The second abnormality detector instructs the driver to turn off the switch after a lapse of a certain time from when the abnormality of the secondary battery is detected, regardless of an instruction from the ECU.

Claims

1. A battery management device that manages a secondary battery that is to be mounted on a vehicle driven by a motor, the battery management device comprising:

a driver configured to drive a switch inserted in a current path where a current discharged from the secondary battery to the motor;

a first abnormality detector configured to detect an abnormality of the secondary battery and instruct the driver to turn off the switch and

a second abnormality detector that is disposed in parallel with the first abnormality detector, and detect the abnormality of the secondary battery, and instructs the driver to turn off the switch,

wherein the first abnormality detector selectively suspends an instruction to turn off the switch to the driver, based on information from the vehicle, when the abnormality of the secondary battery is detected,

the second abnormality detector has a delay function to delay an instruction to turn off the switch to the driver, such that the second abnormality detector instructs the driver to turn off the switch after a lapse of a certain time by the delay function, from when the abnormality of the secondary battery is detected, and the first abnormality detector and the second abnormality detector detects the abnormality of the secondary battery, and the second abnormality detector instructs the driver to turn off the switch after the lapse of the certain time, by the delay function, from when the abnormality of the secondary battery is detected, independently from the instruction to turn off the switch by the first abnormality detector.

2. The battery management device according to claim 1, wherein the first abnormality detector instructs the driver to turn off the switch after a lapse of a preset time from when the abnormality of the secondary battery is detected, in cases where the instruction to turn off the switch is suspended.

3. The battery management device according to claim 1, wherein the first abnormality detector causes to transit to the instruction to turn off the switch, based on the information from the vehicle, in even cases where the instruction to turn off the switch is suspended.

4. The battery management device according to claim 1, wherein

the first abnormality detector and the second abnormality detector are respectively a first overvoltage detector and a second overvoltage detector that instruct the driver to turn off the switch when overvoltage of the secondary battery is detected,

the first overvoltage detector includes a microcontroller that receives a voltage of the secondary battery and a signal from an electronic controller managing and controlling the vehicle and outputs an instruction signal to the driver, and

the second overvoltage detector includes a comparator configured to compare the voltage of the secondary battery with a voltage for overvoltage detection, and a delay circuit configured to delay an output signal of the comparator by the certain time.

5. A power supply system comprising:

a secondary battery that is to be mounted on a vehicle; and

the battery management device according to claim 1, which manages the secondary battery.