JP-7856487-B2 - Energy storage system

Inventors

• 久保 和樹
• 上畑 涼太郎
• 長井 友樹
• 大田 準二

Assignees

• トヨタ自動車株式会社
• 株式会社デンソー

Dates

Publication Date

20260511

Application Date

20220531

Claims (3)

1. A stationary energy storage device that supplies power to an electrical load, A control device that receives power from the aforementioned energy storage device and other power sources, A relay is positioned between the energy storage device and the control device, and between the energy storage device and the electrical load, and not between the control device and the power supply. An input device that receives input from the user, A power storage system comprising, The energy storage device includes a battery pack comprising a plurality of cells electrically connected to each other, The control device is configured to equalize the cell voltages in the battery pack when the relay is in the tripped state. A power storage system in which, when a connection request is input to the input device while the cell voltage equalization is being performed , the control device stops the cell voltage equalization and then connects the relay.
2. A stationary energy storage device that supplies power to an electrical load, A control device that receives power from the aforementioned energy storage device and other power sources, A relay is positioned between the energy storage device and the control device, and between the energy storage device and the electrical load, and not between the control device and the power supply. An input device that receives input from the user, A power storage system comprising, The control device is configured such that when a connection request is input to the input device while the relay is in the disconnected state, the relay is set to the connected state. The input device is configured to accept the connection request input when predetermined conditions are met, and not to accept the connection request input when the predetermined conditions are not met. An energy storage system in which the predetermined condition is met when it is predicted that a predetermined amount of power will not be supplied from the power source to the control device.
3. The input device is mounted on a portable terminal that can be carried by the user. The energy storage system according to claim 2 , wherein the mobile terminal displays a button to accept input of the connection request when the predetermined conditions are met.

Description

This disclosure relates to an energy storage system comprising a stationary energy storage device. International Publication No. 2015/029568 (Patent Document 1) discloses a technique for equalizing cell voltages in a battery pack. International Publication No. 2015/029568 This is a diagram illustrating the outline of the energy storage system according to the embodiment of the present disclosure.This flowchart shows an example of a method for switching the open/closed state (open circuit state/closed circuit state) of an energy storage device according to an embodiment of the present disclosure.This is a flowchart showing the first display control performed by the input device (portable terminal) of the energy storage system shown in Figure 1.This is a flowchart showing the second display control performed by the input device (portable terminal) of the energy storage system shown in Figure 1. Embodiments of this disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated. Figure 1 is a diagram illustrating the outline of an energy storage system according to an embodiment of this disclosure. Referring to Figure 1, the energy storage system according to this embodiment is applied to a building 100. In this embodiment, building 100 is a residence (for example, a user's home). However, it is not limited to this, and building 100 may be other buildings (factories, commercial facilities, etc.). The energy storage system of building 100 includes a control device 112, a control unit 122, a control device 250, and various sensors. Each of the control devices 112, 122, and 250 corresponds to the control unit of the energy storage system, receiving detection results from the various sensors and controlling the power supply equipment of building 100. Furthermore, the control unit of the energy storage system communicates wirelessly with the mobile terminal 500. Each of the control devices 112, 122, and 250 can be a computer equipped with a processor, RAM (Random Access Memory), storage device, timer, and communication interface. The mobile terminal 500 also incorporates a computer with a similar configuration. For example, a CPU (Central Processing Unit) can be used as the processor. The storage device is configured to store the stored information. The storage device may include rewritable non-volatile memory. In each computer, various processes (see, for example, Figures 2 to 4) are executed by the processor executing the program stored in the storage device. However, these various processes are not limited to software execution; they can also be executed by dedicated hardware (electronic circuits). The mobile terminal 500 is carried by the user. In this embodiment, a smartphone equipped with a touch panel display is used as the mobile terminal 500. The touch panel display functions as an input device that receives input from the user. The touch panel display also functions as a display device that shows information to the user. Application software for using the energy storage system is installed on the mobile terminal 500. However, it is not limited to this; any mobile terminal 500 can be used as the mobile terminal 500, including laptops, tablet devices, wearable devices (e.g., smartwatches, smart glasses), or electronic keys. The control device 112, the control unit 122, and the control device 250 are connected, for example, via a bus (not shown), and communicate with each other via wired connections. In this embodiment, the mobile terminal 500 communicates directly with the control unit 122, but not directly with the control device 250. Information exchange between the mobile terminal 500 and the control device 250 is conducted via the control unit 122. This improves the confidentiality of the information security of the control device 250. However, this is not limited to this configuration, and the mobile terminal 500 may be configured to communicate directly with each of the control devices 112, 122, and 250. In this embodiment, the control device 112, control unit 122, and control device 250 are housed in the power conversion unit 110, PCS 120, and energy storage pack 200, respectively, as described below. The energy storage system in building 100 includes a power conversion unit 110, a PCS (Power Conditioning System) 120, and a distribution board 130. Building 100 is also equipped with a stationary energy storage pack 200 and a power generation device 300. The energy storage pack 200 is electrically connected to the power conversion unit 110. The power generation device 300 is electrically connected to the PCS 120. The power conversion unit 110 includes a DC/DC converter 111 and a control device 112 that controls the DC/DC converter 111. The DC/DC converter 111 is a bidirectional DC/DC converter that performs bidirectional power conversion (e.g., voltage transfor