US-20260128585-A1 - ENERGY STORAGE APPARATUS

Abstract

An energy storage apparatus includes a first semiconductor switch and a second semiconductor switch provided in series on a power line between an energy storage device and a negative terminal, a cutoff control switch connected to the first and second semiconductor switches to simultaneously turn off the first and second semiconductor switches when an abnormality of the energy storage device is detected by a management controller, and an external charge detector to simultaneously turn on the first and second semiconductor switches when detecting that an external power supply has been connected to a positive terminal and the negative terminal.

Inventors

• Ryuichi Ito
• Shoichi Arimoto
• Shota Okamoto

Assignees

• GS YUASA INTERNATIONAL LTD.

Dates

Publication Date

20260507

Application Date

20251218

Priority Date

20230620

Claims (7)

1. 1 . An energy storage apparatus comprising: an energy storage device; a management controller; a positive terminal and a negative terminal; a power line connecting the positive terminal, the energy storage device, and the negative terminal to each other; a first semiconductor switch and a second semiconductor switch provided in series on the power line between the energy storage device and the negative terminal; a cutoff control switch connected to the first and second semiconductor switches to simultaneously turn off the first and second semiconductor switches when an abnormality of the energy storage device is detected by the management controller; and an external charge detector to simultaneously turn on the first and second semiconductor switches when detecting that an external power supply has been connected to the positive terminal and the negative terminal.
2. 2 . An energy storage apparatus comprising: an energy storage device; a management controller; a positive terminal and a negative terminal; a power line connecting the positive terminal, the energy storage device, and the negative terminal to each other; a first semiconductor switch and a second semiconductor switch provided in series on the power line the energy storage device and the negative terminal; a cutoff control switch connected to the first and second semiconductor switches to simultaneously turn off the first and second semiconductor switches when a first abnormality of the energy storage device is detected by the management controller; a latch circuit; and a reuse prohibition switch provided in series with the cutoff control switch to be turned off by the latch circuit when a second abnormality of the energy storage device is detected by the management controller, and to maintain an off state even when the second abnormality is resolved.
3. 3 . The energy storage apparatus according to claim 1 , further comprising: a wiring line provided in parallel with the power line to connect the power line, which is between the positive terminal and the energy storage device, and the negative terminal to each other; and a third semiconductor switch on the wiring line.
4. 4 . The energy storage apparatus according to claim 3 , wherein the external charge detector includes an operation restoration switch and a first push-pull circuit to which a potential of the negative terminal is input, and the operation restoration switch is switchable by an output of the first push-pull circuit to cause the first and second semiconductor switches to be simultaneously turned on.
5. 5 . The energy storage apparatus according to claim 4 , further comprising a delay circuit to cause a timing at which the operation restoration switch is set to a standby state to be more delayed than a timing at which a potential of the negative terminal is pulled up.
6. 6 . The energy storage apparatus according to claim 4 , further comprising a second push-pull circuit to which an output of a delay circuit is input, wherein the operation restoration switch is set to a standby state or switching of the operation restoration switch is prohibited depending on an output of the second push-pull circuit.
7. 7 . An energy storage apparatus comprising: an energy storage device; a management controller; a positive terminal and a negative terminal; a power line connecting the positive terminal, the energy storage device, and the negative terminal to each other; a first semiconductor switch and a second semiconductor switch provided in series on the power line between the energy storage device and the negative terminal; a cutoff control switch connected to the first and second semiconductor to switch and simultaneously turn off the first and second semiconductor switches when an abnormality of the energy storage device is detected by the management controller; a latch circuit; and a reuse prohibition switch provided in series with the cutoff control switch, to be turned off by the latch circuit when the abnormality of the energy storage device is detected by the management controller, and to maintain an off state even when the abnormality is resolved.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of priority to Japanese Patent Application No. 2023-100576 filed on Jun. 20, 2023 and is a Continuation Application of PCT Application No. PCT/JP2024/021958 filed on Jun. 18, 2024. The entire contents of each application are hereby incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to energy storage apparatuses. 2. Description of the Related Art Generally, in motorcycles, a lead battery is used as an energy storage apparatus for starting an engine of the motorcycle. However, in Japanese Unexamined Patent Application Publication No. 2020-167766, an energy storage apparatus including a plurality of lithium-ion secondary batteries (energy storage devices) is applied to a motorcycle. In Japanese Unexamined Patent Application Publication No. 2020-167766, as a circuit breaker for protection of the energy storage devices, a field-effect transistor (FET) is provided between a negative electrode of the energy storage device and a negative terminal of the energy storage apparatus (that is, on a low side of the energy storage device). The FET is turned off (opened) when an abnormal event of the energy storage devices, such as overcharge or overcurrent, occurs. SUMMARY OF THE INVENTION Example embodiments of the present invention provide energy storage apparatuses each capable of preventing thermal destruction of a semiconductor switch provided on a low side of a power line, and for which restoration of operation or prohibition of the restoration of operation can be implemented after the switch is turned off. An energy storage apparatus according to an example embodiment of the present invention includes an energy storage device, a management controller, a positive terminal and a negative terminal, a power line connecting the positive terminal, the energy storage device, and the negative terminal to each other, a first semiconductor switch and a second semiconductor switch provided in series on the power line between the energy storage device and the negative terminal, a cutoff control switch connected to the first and second semiconductor switches to simultaneously turn off the first and second semiconductor switches when an abnormality of the energy storage device is detected by the management controller, and an external charge detector to simultaneously turn on the first and second semiconductor switches when detecting that an external power supply has been connected to the positive terminal and the negative terminal. An energy storage apparatus according to another example embodiment of the present invention includes an energy storage device, a management controller, a positive terminal and a negative terminal, a power line connecting the positive terminal, the energy storage device, and the negative terminal to each other, a first semiconductor switch and a second semiconductor switch provided in series on the power line between the energy storage device and the negative terminal, a cutoff control switch connected to the first and second semiconductor switches to simultaneously turn off the first and second semiconductor switches when a first abnormality of the energy storage device is detected by the management controller, a latch circuit, and a reuse prohibition switch provided in series with the cutoff control switch to be turned off by the latch circuit when a second abnormality of the energy storage device is detected by the management controller and to maintain an off state even when the second abnormality is resolved. An energy storage apparatus according to yet another example embodiment of the present invention includes an energy storage device, a management controller, a positive terminal and a negative terminal, a power line connecting the positive terminal, the energy storage device, and the negative terminal to each other, a first semiconductor switch and a second semiconductor switch provided in series on the power line between the energy storage device and the negative terminal, a cutoff control switch connected to the first and second semiconductor switches to simultaneously turn off the first and second semiconductor switches when an abnormality of the energy storage device is detected by the management controller, a latch circuit, and a reuse prohibition switch provided in series with the cutoff control switch to be turned off by the latch circuit when the abnormality of the energy storage device is detected by the management controller and to maintain an off state even when the abnormality is resolved. According to the above example embodiments, it is possible to provide energy storage apparatuses each capable of preventing thermal destruction of the first and second semiconductor switches provided on the power line by simultaneously turning off the first and second semiconductor switches, and for which restoration of operation or prohibition of the resto