Storage battery apparatus with current cutoff control

Patent metadata

Field	Value
Publication number	US-11437834-B2
Application number	US-202016812460-A
Country	US
Kind code	B2
Filing date	Mar 9, 2020
Priority date	Sep 12, 2017
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

An apparatus according to one embodiment includes a positive and a negative electrode terminals; modules each including an assembled battery and a CMU, the assembled battery including cells, the CMU to detect a voltage and a temperature of the assembled battery; a main circuit for electrical connection between terminals of the modules and the positive and negative electrode terminals; a BMU to receive information about the voltage and the temperature from the respective CMU; a supply circuit to convert DC power from the main circuit and supply the converted power to the BMU; a breaker for interrupting the main circuit; and a circuit to block a current flowing through the main circuit in a direction of charging the modules, in response to a stop of a control signal from the BMU.

First claim

The invention claimed is:

1. A storage battery apparatus, comprising:
a positive electrode terminal and a negative electrode terminal adapted for external connection;
a plurality of battery modules each comprising an assembled battery and a cell monitoring unit, the assembled battery comprising a plurality of battery cells, the cell monitoring unit configured to detect a voltage of the battery cells and a temperature of the assembled battery;
a main circuit for electrical connection between a high potential side terminal of the battery modules and the positive electrode terminal, and between a low potential side terminal of the battery modules and the negative electrode terminal;
a battery management unit configured to receive information about the voltage of the battery cells and the temperature of the assembled battery from the respective cell monitoring unit;
a supply circuit configured to convert DC power from the main circuit into predetermined DC power and supply the converted power to the battery management unit;
a circuit breaker for interrupting the main circuit in response to an overcurrent flowing in the main circuit; and
a charge current cutoff circuit configured to block a current flowing through the main circuit in a direction of charging the battery modules, when a control signal from the battery management unit is stopped due to a supply of power to the battery management unit being terminated and the battery management unit being halted.

2. The storage battery apparatus according to claim 1 , further comprising a tripping circuit for the circuit breaker, the tripping circuit comprising a path for supplying a tripping current from the main circuit to the circuit breaker, and a first electromagnetic contactor configured to close a contact point on the path in response to the stop of the control signal from the battery management unit.

3. The storage battery apparatus according to claim 2 , wherein the charge current cutoff circuit comprises a diode on the main circuit and a second electromagnetic contactor connected in parallel with the diode, the diode having a forward direction conforming to a direction of a current flowing from the high potential side terminal of the battery modules to the positive electrode terminal, the second electromagnetic contactor configured to open a contact point in response to the stop of the control signal from the battery management unit.

4. The storage batter apparatus according to claim 1 , wherein the charge current cutoff circuit comprises a diode on the main circuit and a second electromagnetic contactor connected in parallel with the diode, the diode having a forward direction conforming to a direction of a current flowing from the high potential side terminal of the battery modules to the positive electrode terminal, the second electromagnetic contactor configured to open a contact point in response to the stop of the control signal from the battery management unit.

Assignees

• Toshiba Kk

Inventors

• Kuroda Kazuto
• Takahashi Jun
• Saeki Yosuke
• Okabe Ryo
• Sato Shinya
• Nakata Keita
• Inamura Atsushi
• Sekino Masahiro
• Oota Minoru

Classifications

• H02J7/62

  against overcurrent · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title

• H02J7/82 Primary

  Control of state of charge [SOC] · CPC title

• H02J13/12

  Monitoring network conditions, e.g. electrical magnitudes or operational status · CPC title

• H02J7/825

  Detection of fully charged condition · CPC title