Battery system

• US 10,132,871 B2
• Filed: 01/18/2018
• Issued: 11/20/2018
• Est. Priority Date: 04/15/2013
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Miura, Hikaru, Kikuchi, Mutsumi, Kudoh, Akihiko, Kanai, Tomonori
• Primary Examiner(s): Skibinski, Thomas
• Application Number:
  US15/874,548
• Publication Number:
  US 20180143260A1
• Time in Patent Office: 306 Days
• Field of Search: 307 43, 307 77, 307 82, 307 83, 320116, 320118, 320134, 320136
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: G01R 15/22 using light-emitting devices, e.g. LED, optocouplers G01R31/31901 takes precedence
• CPC Class Codes: G01R 31/371 with remote indication, e.g. on external chargers
• 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 10/482 for several batteries or cells simultaneously or sequentially
• CPC Class Codes: H01M 2010/4278 Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
• CPC Class Codes: H01M 2220/20 Batteries in motive systems, e.g. vehicle, ship, plane
• CPC Class Codes: H02J 1/10 Parallel operation of dc sources
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• 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 system includes a battery module having a plurality of assembled batteries. Battery monitoring circuits are provided to correspond to each of the assembled batteries of the battery module. A control circuit controls operation of the battery monitoring circuits. A first signal transmission path transmits signals that are input and output between the battery monitoring circuits and the control circuit. A first isolation element is connected to the control circuit, and a second isolation element is connected to the battery monitoring circuit. The first signal transmission path is isolated from the control circuit by the second isolation element. The electrical potential of the first signal transmission path is a floating potential in relation to the electrical potentials of the control circuit and battery monitoring circuits.

Claims

1. A battery system, comprising:

a battery module in which a plurality of assembled batteries each having a plurality of battery cells are connected;

a plurality of battery monitoring circuits that are each provided so as to correspond to each of the assembled batteries of the battery module and each monitor a status of each of the battery cells of each of the assembled batteries; and

a plurality of boards, wherein;

the plurality of battery monitoring circuits are each provided on each of the plurality of boards which are different from each other;

the plurality of boards each include a capacitor;

the plurality of battery monitoring circuits are connected via the capacitor and a relay signal transmission path; and

an electrical potential of the relay signal transmission path is a floating potential in relation to electrical potentials of the battery monitoring circuits.

2. The battery system according to claim 1, further comprising

a control circuit for controlling each of operations of the plurality of battery monitoring circuits;

a transmission/reception signal transmission path for transmitting signals that are input and output between the plurality of battery monitoring circuits and the control circuit; and

an isolation element connected to the control circuit, wherein;

the transmission/reception signal transmission path is isolated from the control circuit by the isolation element and is isolated from the battery monitoring circuit by the capacitor; and

an electrical potential of the transmission/reception signal transmission path is a floating potential in relation to the electrical potential of the control circuit and the electrical potentials of the battery monitoring circuits.

3. The battery system according to claim 2, further comprising:

an isolated power supply for supplying power isolated from the control circuit and the battery monitoring circuits to the isolation element, wherein;

the isolation element includes an isolation element for transmission in which an input side is connected to the control circuit and an output side is connected to the transmission/reception signal transmission path, and an isolation element for reception in which an input side is connected to the transmission/reception signal transmission path and an output side is connected to the control circuit; and

the isolated power supply supplies the power to the output side of the isolation element for transmission and the input side of the isolation element for reception.

4. The battery system according to claim 3, wherein

the isolated power supply is incorporated in the isolation element.

5. The battery system according to claim 3, further comprising

a switch circuit for switching an operation status of the isolated power supply depending on controlling of the control circuit.

6. A battery system, comprising:

a battery module in which a plurality of assembled batteries each having a plurality of battery cells are connected;

battery monitoring circuits that are each provided so as to correspond to each of the assembled batteries of the battery module and each monitor a status of each of the battery cells of each of the assembled batteries;

a control circuit for controlling operations of the battery monitoring circuits;

a first signal transmission path for transmitting signals that are input and output between the battery monitoring circuits and the control circuit;

a first isolation element connected to the control circuit;

a second isolation element connected to one of the battery monitoring circuits;

an isolated power supply for supplying power isolated from the control circuit and the battery monitoring circuits to the first isolation element;

a switch circuit for switching an operation status of the isolated power supply depending on controlling of the control circuit, wherein;

the first signal transmission path is isolated from the control circuit by the first isolation element and is isolated from the battery monitoring circuit by the second isolation element;

an electrical potential of the first signal transmission path is a floating potential in relation to an electrical potential of the control circuit and electrical potentials of the battery monitoring circuits;

the first isolation element includes an isolation element for transmission in which an input side is connected to the control circuit and an output side is connected to the first signal transmission path, and an isolation element for reception in which an input side is connected to the first signal transmission path and an output side is connected to the control circuit; and

the isolated power supply supplies the power to the output side of the isolation element for transmission and the input side of the isolation element for reception.