BATTERY MANAGEMENT SYSTEM FOR TRANSMITTING SECONDARY PROTECTION SIGNAL AND DIAGNOSIS SIGNAL USING A SMALL NUMBER OF INSULATION ELEMENTS

• US 20160380442A1
• Filed: 10/16/2014
• Published: 12/29/2016
• Est. Priority Date: 10/25/2013
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Kang, Ju-Hyun, Eguchi, Yasuhito, Tanina, Shoji
• Granted Patent: US 10,177,579 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: G01R 31/36 Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
• CPC Class Codes: G01R 31/371 with remote indication, e.g. on external chargers
• 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 10/425 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 10/482 for several batteries or cells simultaneously or sequentially
• 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: H02J 7/0014 Circuits for equalisation of charge between batteries
• CPC Class Codes: H02J 7/0018 using separate charge circuits
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence
• CPC Class Codes: H04J 3/02 Details electronic switching or gating H03K17/00
• CPC Class Codes: H04Q 2209/10 using a centralized architecture
• CPC Class Codes: H04Q 2209/30 using a wired architecture
• CPC Class Codes: H04Q 9/00 Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

Disclosed is a battery management system for transmitting a secondary protection signal and a diagnosis signal using a small number of insulation elements. N battery management units included in the battery management system transmit at least two pieces of data via one communication line through time division. N data signals transmitted from the N battery management units are transmitted in a sequential order or are mixed to one signal and transmitted to an external device.

Claims

1. A battery management system for managing a battery pack, comprising:

N battery management units configured to manage secondary batteries included in the battery pack, in which N is a natural number greater than or equal to 2;

N communication lines electrically connected to each battery management unit to transmit data to an external device which controls the battery management system;

an insulation element configured to transmit a signal while electrically separating the external device from the battery management system; and

a selective connection device configured to selectively connect any one of the N communication lines to the insulation element by a control signal,

wherein each battery management unit transmits at least two pieces of data through time division.

2. The battery management system according to claim 1, wherein the selective connection device comprises:

a switch; and

a switch controller configured to output a control signal to the switch.

3. The battery management system according to claim 1, wherein the selective connection device is a calculator.

4. The battery management system according to claim 1, wherein the insulation element is a photo coupler.

5. The battery management system according to claim 1, further comprising:

a level shift electrically connected between each battery management unit and the communication line.

6. The battery management system according to claim 2, wherein the switch controller is connected to the external device through the insulation element, and is controlled by the external device.

7. The battery management system according to claim 1, wherein each battery management unit transmits at least two pieces of data through time division using ADSYNC changing in logic level of a signal at a data transmission preparation section and a start point of a data transmission section.

8. The battery management system according to claim 7, wherein the at least two pieces of data included in the data transmission section of the ADSYNC have the same width of each data.

9. The battery management system according to claim 7, wherein among the at least two pieces of data included in the data transmission section of the ADSYNC, a width of data distant from the start point of the data transmission section is wider than a width of data close to the start point.

10. The battery management system according to claim 9, wherein the width of the data distant from the start point of the data transmission section is wider by at least 5% than the width of the data close to the start point of the data transmission section.

11. The battery management system according to claim 7, wherein a pulse indicating a boundary between the data is included in the data transmission section of the ADSYNC.

12. The battery management system according to of claim 1, wherein the N battery management units further comprise a synchronization line to establish an electrical connection for synchronization with adjacent other battery management unit.

13. The battery management system according to claim 12, wherein the N battery management units perform synchronization by ADSYNC.

14. The battery management system according to claim 13, wherein the N battery management units respectively output a free-run ADSYNC and are synchronized to any one of the outputted free-run ADSYNCs.

15. The battery management system according to claim 14, wherein the N battery management units are synchronized to a free-run ADSYNC with a narrowest width of a data transmission preparation section and a narrowest width of an ADSYNC cycle among the free-run ADSYNCs outputted from the N battery management units.