EP-4220007-B1 - STREETLIGHT

Inventors

• MITSUOKA, SHIGEHI
• SUZUKI, TAKAFUMI
• FURUKI, Kazushi
• HIGASHI, NAOKI
• ASANO, TORU

Dates

Publication Date

20260513

Application Date

20230103

Claims (3)

1. A streetlight (1) comprising: a plurality of battery packs (5) arranged in an up-down direction inside a columnar member (2) and capable of supplying electricity to an illumination device (4); and a control device (6) that is disposed above the battery packs (5) inside the columnar member (2) and controls the battery packs (5), wherein a battery (53), a relay (54), and a submersion sensor (56) are provided in each battery pack (5), a positive terminal (60) that outputs a voltage of the battery (53) to the outside of the battery pack (5) is provided in each battery pack (5), the positive terminal (60) and a positive electrode (53a) of the battery (53) are connected via the relay (54) so as to be electrically conductive, wherein the relay (54) of a battery pack (5) is switched to a disconnected state when submersion is detected by the submersion sensor (56) in that battery pack (5), while a relay (54) of a battery pack (5) arranged immediately above that battery pack (5) is switched to a connected state.
2. The streetlight (1) as claimed in claim 1, wherein in each battery pack (5) the positive terminal (60) is located above the submersion sensor (56).
3. The streetlight (1) as claimed in any one of claims 1 or 2, wherein each battery pack (5) is a reused on-vehicle battery pack.

Description

[Technical Field] The present invention relates to a streetlight. [Background Art] In recent years, efforts have been made to reuse battery packs that had been mounted on a vehicle. Since there is a problem that such efforts are unprofitable when the battery pack is dismantled into cells and modules, the battery pack is reused as it is. However, a battery pack using small lithium ion batteries has a small battery capacity, and therefore cannot be used as it is for household power. Against this background, one reuse application of a battery pack using small lithium ion batteries is a streetlight electric storage device. Further, the streetlight may be a solar-type streetlight (hereinafter referred to as a "solar streetlight"). An example of a streetlight can be found for instance in CN 204 652 727 U or CN 211 399 584 U. Performance such as capacity and internal resistance of a battery pack collected from the market is deteriorated as compared to a new battery pack, and performance varies among battery packs. In consideration of such circumstances, it is necessary to increase the capacity by combining a plurality of battery packs when reusing battery packs. An example of a battery pack can be found for instance in KR 2012 0117477 A. JP2011-155232A discloses a streetlight using a photovoltaic power supply device in which a battery pack is disposed at the same height as a solar panel to reduce the risk of water immersion into a battery box incorporating the battery pack at the time of a disaster such as a flood or a tsunami. [Citation List] [Patent Literature] [Patent Literature 1] JP2011-155232A [Summary of Invention] [Technical Problem] However, in the streetlight described in JP2011-155232A, since the heavy battery box is mounted in a high position, there has been a problem of poor workability of installation and maintenance of the battery box. The present invention has been made in view of the foregoing, and aims to provide a streetlight that can improve workability of installation and maintenance of a battery pack. [Solution to Problem] In order to achieve the above objective, the present invention includes a configuration of a streetlight including: a plurality of battery packs arranged in an up-down direction inside a columnar member and capable of supplying electricity to an illumination device; and a control device that is disposed above the battery packs inside the columnar member and controls the battery packs, in which a battery, a relay, and a submersion sensor are provided in each battery pack, a positive terminal that outputs a voltage of the battery to the outside of the battery pack is provided in each battery pack, the positive terminal and a positive electrode of the battery are connected via the relay so as to be electrically conductive, and the relay of a battery pack is switched to a disconnected state when submersion is detected by the submersion sensor in that battery pack, while a relay of a battery pack arranged immediately above that battery pack is switched to a connected state. [Advantageous Effect of Invention] According to the present invention, it is possible to provide a streetlight that can improve workability of installation and maintenance of a battery pack. [Brief Description of Drawings] [Figure 1] Figure 1 is a schematic configuration diagram of a solar streetlight according to an example of the present invention, where (a) is a front view and (b) is a left side view.[Figure 2] Figure 2 is a schematic configuration diagram of a battery pack of the solar streetlight according to the example of the present invention.[Figure 3] Figure 3 is a block diagram illustrating an outline of electrical connection of the solar streetlight according to the example of the present invention. [Description of Embodiment] A streetlight according to an embodiment of the present invention includes: a plurality of battery packs arranged in an up-down direction inside a columnar member and capable of supplying electricity to an illumination device; and a control device that is disposed above the battery packs inside the columnar member and controls the battery packs, in which a battery, a relay, and a submersion sensor are provided in each battery pack, a positive terminal that outputs a voltage of the battery to the outside of the battery pack is provided in each battery pack, the positive terminal and a positive electrode of the battery are connected via the relay so as to be electrically conductive, and the relay of a battery pack is switched to a disconnected state when submersion is detected by the submersion sensor in that battery pack, while a relay of the battery pack arranged immediately above that battery pack is switched to a connected state. With this configuration, the streetlight according to the embodiment of the present invention can improve workability of installation and maintenance of the battery pack. [Example] Hereinafter, a streetlight according to an example of the present