JP-7856518-B2 - Energy storage device

JP7856518B2JP 7856518 B2JP7856518 B2JP 7856518B2JP-7856518-B2

Inventors

中野峰士
飯田純一
田丸耕二郎
守作直人
伊藤匡平
井上拓
森岡怜史
奥村素宜

Assignees

株式会社豊田自動織機
トヨタ自動車株式会社

Dates

Publication Date: 20260511
Application Date: 20220727

Claims (5)

An electrode stack comprising a plurality of electrodes stacked along a first direction, and a power storage module having a sealing portion provided around the electrode stack to seal the spaces between the electrodes, A pair of restraint plates arranged to sandwich the electrode stack in the first direction, A plurality of connecting members are arranged on the outside of the sealing portion when viewed from the first direction, extending along the first direction and connecting the pair of restraining plates along the first direction, thereby restraining the electrode laminate. Equipped with, The outer circumferential surface of the sealing portion along the first direction is formed with a canopy portion having an upper surface that slopes away from the outer circumferential surface as it extends downward in the first direction. In the portion of the canopy facing each of the connecting members, a notch is formed so as to be spaced apart from the connecting member. A wall portion is formed at the edge of the notch, projecting upward from the edge in the first direction and extending along the edge. Energy storage device.
The wall portion extends along the entire edge so as to reach the tip of the eaves portion. The energy storage device according to claim 1.
The upper end surface of the wall portion in the first direction is either flush with the upper end surface of the seal portion, which is the upper end surface of the portion of the seal portion corresponding to the notch in the first direction, or is located above the upper end surface of the seal portion in the first direction. The energy storage device according to claim 1.
The shape of the outer edge of the portion of the connecting member facing the outer peripheral surface is arc-shaped when viewed from the first direction. The shape of the edge portion and the wall portion of the notch are arc-shaped, which are recessed in a manner corresponding to the shape of the outer edge of the connecting member when viewed from the first direction. The energy storage device according to claim 1.
The wall portion is inclined such that it moves away from the outer peripheral surface as it moves upward in the first direction. The energy storage device according to any one of claims 1 to 4.

Description

This disclosure relates to an energy storage device. Patent Document 1 describes an energy storage device. This device includes a restraint, a plurality of energy storage units, a plurality of current collector plates, and an insulating plate. The restraint includes a top plate, a bottom plate, and a column. The plurality of energy storage units, the plurality of current collector plates, and the insulating plate are arranged between the top plate and the bottom plate. The upper end of the column is fixed to the top plate, and the lower end of the column is fixed to the bottom plate. The energy storage unit includes a sealing member and a canopy formed on the long wall portion of the sealing member. The canopy includes an inclined portion having an inclined surface that extends downward as it moves horizontally away from the outer circumferential surface of the long wall portion. The column of the restraint extends along the long wall portion in the stacking direction of the energy storage units. International Publication No. 2020/138110 Figure 1 is a schematic cross-sectional view showing a cross-section of a power storage device according to one embodiment, including the first and second directions.Figure 2 is a schematic cross-sectional view showing a cross-section of a power storage device according to one embodiment, including the first and third directions.Figure 3 is a schematic cross-sectional view showing the energy storage module shown in Figures 1 and 2.Figure 4 is a plan view of the energy storage module shown in Figures 1-3.Figure 5 is an enlarged view of the portion P1 shown in Figure 4.Figure 6 is an enlarged view of the portion P2 shown in Figure 4.Figure 7 is a schematic cross-sectional view of portion P2 shown in Figure 4. The following describes one embodiment of the energy storage device with reference to the drawings. In the description of each figure, the same or equivalent elements are denoted by the same reference numeral, and redundant explanations may be omitted. Furthermore, each figure illustrates a Cartesian coordinate system composed of a first axis defining the first direction D1, a second axis defining the second direction D2, and a third axis defining the third direction D3. As an example, the first direction D1 is the vertical direction, and the second direction D2 and the third direction D3 are two intersecting horizontal directions. Figure 1 is a schematic cross-sectional view showing a cross-section of a power storage device according to one embodiment, including the first and second directions. Figure 2 is a schematic cross-sectional view showing a cross-section of a power storage device according to one embodiment, including the first and third directions. The power storage device 1 shown in Figures 1 and 2 can be used, for example, as a battery for various vehicles such as forklifts, hybrid vehicles, and electric vehicles. The power storage device 1 comprises a module stack 2 including a plurality of power storage modules 4 stacked along the first direction D1, and a restraining member 3 that applies a restraining load to the module stack 2 along the first direction D1. The module stack 2 includes multiple (in this case, three) energy storage modules 4 and multiple (in this case, two) conductive plates 5. The energy storage modules 4 are, for example, bipolar batteries and have a rectangular shape when viewed from the first direction D1. More specifically, the energy storage modules 4 are rectangular in shape with a long side and a short side when viewed from the first direction D1. The energy storage modules 4 are, for example, secondary batteries such as nickel-metal hydride batteries and lithium-ion batteries, or electric double-layer capacitors. In the following description, a nickel-metal hydride secondary battery is used as an example. In the module stack 2, a conductive plate 5 is interposed between adjacent energy storage modules 4 along the first direction D1. This electrically connects multiple energy storage modules 4 via the conductive plate 5. More specifically, each energy storage module 4 has a positive terminal surface on one end face in the first direction D1 and a negative terminal surface on the other end face in the first direction D1, and multiple energy storage modules 4 stacked via the conductive plate 5 are connected in series. A current collector plate 6 with a positive terminal 6a is positioned on the outside of an energy storage module 4 located at one end of the module stack 2 in the first direction D1, and is electrically connected to that module 4. Similarly, a current collector plate 7 with a negative terminal 7a is positioned on the outside of an energy storage module 4 located at the other end of the module stack 2 in the first direction D1, and is electrically connected to that module 4. Charging and discharging of the energy storage device 1 is performed using these positive terminal 6a and negative terminal 7a. Multiple flow channel