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JP-2026075830-A - Energy storage device

JP2026075830AJP 2026075830 AJP2026075830 AJP 2026075830AJP-2026075830-A

Abstract

[Problem] To provide an energy storage device with improved reliability. [Solution] The energy storage device 1 comprises an outer casing 10 and an energy storage element housed inside the outer casing. The outer casing includes a ventilation chamber 100 connecting the inside and outside of the outer casing. The ventilation chamber includes a through hole 115 connected to the inside of the outer casing, a first wall portion 110 with a through hole penetrating in a first direction, a membrane member 200 that closes the through hole, a side wall portion 150 positioned to surround the through hole, a side wall portion with an opening connecting the inside of the ventilation chamber to the outside of the outer casing, and a second wall portion 132 positioned between the opening and the through hole. The inside of the ventilation chamber is located in one direction from the first wall portion, a gap G is formed between the second wall portion and the inner surface of the ventilation chamber, and at least a part of the gap, the first gap Ga, is located in the other direction from the membrane member. [Selection Diagram] Figure 7

Inventors

  • 柴田 延言

Assignees

  • 株式会社ＧＳユアサ

Dates

Publication Date
20260511
Application Date
20241023

Claims (5)

  1. It comprises an outer casing and an energy storage element housed inside the outer casing, The exterior body includes a ventilation chamber that connects the inside and outside of the exterior body. The aforementioned ventilation chamber is A through hole connected to the interior of the exterior body, comprising a first wall portion having a through hole that penetrates in a first direction, A membrane member that seals the through hole, A side wall portion positioned to surround the aforementioned through hole, the side wall portion having an opening that connects the inside of the ventilation chamber to the outside of the exterior body, A second wall portion is disposed between the opening and the through hole, The interior of the ventilation chamber is located in one direction relative to the first wall, A gap is formed between the second wall portion and the inner surface of the ventilation chamber. The first gap, which is at least a part of the gap, is located in the other direction of the first direction, relative to the film member. Energy storage device.
  2. The ventilation chamber comprises a third wall portion facing the first wall portion in the first direction, The first end of the second wall portion is connected to the third wall portion. The energy storage device according to claim 1.
  3. The first gap is formed between the first edge of the second wall portion and the inner surface, The width of the first gap in the first direction increases as it approaches the opening. The energy storage device according to claim 1 or 2.
  4. The side wall portion is provided with a first inclined surface facing the interior of the ventilation chamber, The first inclined surface is tilted in a direction that moves closer to the outside of the exterior body as it approaches the opening. The energy storage device according to claim 1 or 2.
  5. The ventilation chamber is provided with a second inclined surface located on the other side in the first direction relative to the second wall portion, The second inclined surface is tilted in a direction that advances toward the other side of the first direction as it approaches the opening. The energy storage device according to claim 1 or 2.

Description

This invention relates to an energy storage device. The battery pack disclosed in Patent Document 1 comprises a battery module, an electrical unit, and a housing. The housing contains a first housing space for the battery module and a second housing space for the electrical unit. A duct is provided in the portion of the housing forming the second housing space, connecting the second housing space to the outside of the housing. The duct is equipped with a filter that closes the gas passage of the duct. The filter opens the gas passage of the duct when the gas pressure in the second housing space exceeds a predetermined value relative to the atmospheric pressure outside the housing. International Publication No. 2021/049315 Figure 1 is a perspective view showing the external appearance of an energy storage device according to an embodiment.Figure 2 is an exploded perspective view of the energy storage device according to the embodiment.Figure 3 is an exploded perspective view showing the configuration of the ventilation chamber according to the embodiment.Figure 4 is a perspective view showing the configuration of the third wall portion according to the embodiment.Figure 5 is a plan view showing the internal configuration of the ventilation chamber according to the embodiment.Figure 6 is a plan view showing the position of the second wall portion in the ventilation chamber according to the embodiment.Figure 7 is a first cross-sectional view of the ventilation chamber according to the embodiment.Figure 8 is a second cross-sectional view of the ventilation chamber according to the embodiment.Figure 9 is a third cross-sectional view of the ventilation chamber according to the embodiment.Figure 10 is a cross-sectional view of a ventilation chamber according to a modified example of the embodiment. (1) An energy storage device according to one aspect of the present invention comprises an outer casing and an energy storage element housed inside the outer casing. The outer casing includes a ventilation chamber connecting the inside and outside of the outer casing. The ventilation chamber comprises a first wall portion having a through-hole connected to the inside of the outer casing and penetrating in a first direction, a membrane member closing the through-hole, a side wall portion positioned to surround the through-hole and having an opening connecting the inside of the ventilation chamber to the outside of the outer casing, and a second wall portion positioned between the opening and the through-hole. The inside of the ventilation chamber is located in one direction from the first wall portion, a gap is formed between the second wall portion and the inner surface of the ventilation chamber, and at least a part of the gap, the first gap, is located in the other direction from the membrane member. According to one embodiment of the present invention, gas exchange between the inside and outside of the outer casing can occur through through-holes provided in the ventilation chamber. In the ventilation chamber, a second wall is positioned between the opening and the through-holes, thereby preventing liquid entering from the opening from reaching the membrane member. A gap exists between the second wall and the inner surface of the ventilation chamber, allowing gas exchange between the inside and outside of the outer casing to occur through this gap. Furthermore, in the first direction, the position of the first gap, which is at least a part of the gap, is on the other side of the first direction (closer to the inside of the outer casing) than the membrane member. Therefore, even if liquid reaches the first gap from the opening, its arrival at the membrane member from the first gap is suppressed. Consequently, deterioration or damage to the membrane member due to liquid adhesion is suppressed. Thus, the energy storage device according to this embodiment is an energy storage device with improved reliability. (2) In the energy storage device described in (1) above, the ventilation chamber may include a third wall facing the first wall in the first direction, and one end of the second wall in the first direction may be connected to the third wall. According to the energy storage device described in (2) above, one end of the second wall in the first direction is connected to the third wall, thus preventing the formation of a gap at that end. Therefore, liquid entering through the opening becomes less likely to reach the membrane member. (3) In the energy storage device described in (1) or (2) above, the first gap may be formed between the first edge of the second wall portion and the inner surface, and the width of the first gap in the first direction may increase as it approaches the opening. According to the energy storage device described in (3) above, the width of the first gap increases as it approaches the opening, thereby promoting the flow of liquid that has entered the first gap towards the opening. Therefore, liq