Search

JP-2026074489-A - Energy storage device

JP2026074489AJP 2026074489 AJP2026074489 AJP 2026074489AJP-2026074489-A

Abstract

[Problem] In an exterior body where the battery case and lid are joined by heat welding, the objective is to provide a reliable energy storage device that suppresses damage to the joint when the internal pressure of the exterior body increases. [Solution] The energy storage device comprises an energy storage element and an outer casing 10 that houses the energy storage element. The outer casing comprises a first outer casing 12 having an opening on one side in the first direction, a second outer casing 20 that closes the opening, a joint 90 that joins the opening end face, which is the end face of the opening, and the second outer casing by welding or adhesive, and a shaft member 100 that extends in the first direction and penetrates the joint. The first outer casing has a first shaft hole 110 provided on the opening end face, and the second outer casing has a second shaft hole 120 facing the first shaft hole in the first direction. The shaft member is inserted into the first shaft hole and the second shaft hole. [Selection Diagram] Figure 4

Inventors

  • 中畑 拓也

Assignees

  • 株式会社ＧＳユアサ

Dates

Publication Date
20260507
Application Date
20241021

Claims (7)

  1. Energy storage element, The system comprises an outer casing for housing the energy storage element, The exterior body is, A first exterior body having an opening on one side in the first direction, A second exterior body that closes the aforementioned opening, A joint portion is provided to join the opening end face, which is the end face of the opening, and the second exterior body by welding or bonding. It comprises a shaft member that extends in the first direction and penetrates the joint, The first exterior body is The opening end face is provided with a first shaft hole, The second exterior body is provided with a second shaft hole facing the first shaft hole in the first direction, The shaft members are inserted into the first shaft hole and the second shaft hole. Energy storage device.
  2. The opening has a thicker portion where the thickness of the opening end face is greater than that of other parts. The first shaft hole is provided in the thickened portion. The energy storage device according to claim 1.
  3. The exterior body is made of resin, and the shaft member is made of metal. The energy storage device according to claim 1 or 2.
  4. The shaft member comprises a screw shaft portion that is connected to at least one of the first shaft hole and the second shaft hole, and has a screw shaft portion on its outer circumference. The energy storage device according to claim 1 or 2.
  5. The first shaft hole penetrates the first outer casing in the first direction, or the second shaft hole penetrates the second outer casing in the first direction. The energy storage device according to claim 1 or 2.
  6. The shaft member does not have any portion exposed to the outside of the outer casing. The energy storage device according to claim 1 or 2.
  7. Energy storage element, The system comprises an outer casing for housing the energy storage element, The exterior body is, A first exterior body having an opening on one side in the first direction, A second exterior body that closes the aforementioned opening, A joint portion is formed by welding the opening end face, which is the end face of the opening, to the second exterior body, It comprises a shaft member that extends in the first direction and penetrates the joint, The first exterior body is The opening end face is provided with a first shaft hole, The second exterior body is provided with a second shaft hole facing the first shaft hole in the first direction, The shaft members are inserted into the first shaft hole and the second shaft hole. Energy storage device.

Description

This invention relates to an energy storage device. Patent Document 1 discloses a battery comprising a lead-acid battery case, which is an outer casing, and a lead-acid battery cover that closes the upper opening of the lead-acid battery case. The lead-acid battery case is partitioned internally by battery compartment walls, and an auxiliary battery storage chamber is provided inside the lead-acid battery case, where the auxiliary battery is housed. The lead-acid battery cover is heat-welded to the outer periphery wall of the lead-acid battery case and the upper edge of the battery compartment wall, closing the upper openings of the cell chamber and the auxiliary battery storage chamber. Special Publication No. 2015-11847 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 shaft member and its surrounding components according to an embodiment.Figure 4 is a cross-sectional view showing the configuration of the shaft member and its surrounding area according to the embodiment.Figure 5 is an enlarged cross-sectional view showing a portion of the cross-sectional view shown in Figure 4.Figure 6 is a perspective view showing a partial arrangement range of the joint according to the embodiment.Figure 7 is a perspective view illustrating an example of a method for forming a joint according to an embodiment.Figure 8 is a cross-sectional view showing the configuration of the shaft member and its surrounding area according to a modified example 1 of the embodiment.Figure 9 is a cross-sectional view showing the configuration of the shaft member and its surrounding area according to a modified example 2 of the embodiment.Figure 10 is a cross-sectional view showing the configuration of the shaft member and its surrounding area according to a modified example 2 of the embodiment. (1) An energy storage device according to one aspect of the present invention comprises an energy storage element and an outer casing housing the energy storage element, wherein the outer casing comprises a first outer casing having an opening on one side in a first direction, a second outer casing closing the opening, a joint that joins the opening end face (which is the end face of the opening) and the second outer casing by welding or adhesive, and a shaft member extending in the first direction and penetrating the joint, wherein the first outer casing has a first shaft hole provided in the opening end face, and the second outer casing has a second shaft hole facing the first shaft hole in the first direction, and the shaft member is inserted into the first shaft hole and the second shaft hole. According to one aspect of the present invention, the interior of the outer casing can be sealed by joining the second outer casing and the open end face of the first outer casing at a joint. Furthermore, a shaft member exists at the boundary between the second and first outer casings, penetrating the joint and inserted into both the second and first outer casings. Therefore, even if the outer casing deforms and expands due to an increase in internal pressure, the increase in stress at the joint is suppressed, effectively preventing damage to the joint. Consequently, the energy storage device according to one aspect of the present invention is an energy storage device with improved reliability. (2) In the energy storage device described in (1) above, the opening may have a thickened portion where the thickness of the opening end face is greater than that of other parts, and the first shaft hole may be provided in the thickened portion. According to the energy storage device described in (2) above, the shaft member is more stably supported by the thicker portion, and/or the diameter of the shaft member can be increased. This makes the joint less susceptible to damage. (3) In the energy storage device described in (1) or (2) above, the outer casing may be made of resin, and the shaft member may be made of metal. According to the energy storage device described in (3) above, problems such as strength reduction due to heat or vibration are less likely to occur in the shaft member. This contributes to improving the reliability of the energy storage device. (4) In the energy storage device described in any one of (1) to (3) above, the shaft member may be a screw shaft portion connected to at least one of the first shaft hole and the second shaft hole, and comprising a screw shaft portion having screw threads on its outer circumference. According to the energy storage device described in (4) above, bolts or tapping screws can be used as shaft members. This improves the bonding force between the shaft member and the first shaft hole and/or second shaft hole, resulting in further improvement of the joint strength. (5) In the energy storage device de