JP2023019871A - power storage device - Google Patents

Abstract

To provide a power storage device capable of saving spaces.SOLUTION: A power storage device 10 comprises a power storage element 100, a side plate 500 arranged on the lateral side of the power storage element 100 in a first direction, and an insulation member 600 arranged between the power storage element 100 and the side plate 500. The side plate 500 comprises a plate body part 510 facing the power storage element 100 in the first direction and a plate protrusion 530 protruding from the plate body part 510 in the first direction and facing the power storage element 100 in a second direction. The insulation member 600 comprises an insulation body part 610 arranged between the power storage element 100 and the plate body part 510 and an insulation protrusion 630 protruding from the insulation body part 610 in the first direction and arranged between the power storage element 100 and the plate protrusion 530 in the second direction. The power storage device 10 further comprises a securing member 700 for securing the insulation protrusion 630 to the plate protrusion 530.SELECTED DRAWING: Figure 5

Description

The present invention relates to a power storage device including power storage elements.

Conventionally, a power storage device is known that includes a power storage element, a side plate arranged on the side of the power storage element, and an insulating member arranged between the power storage element and the side plate. For example, Patent Literature 1 discloses a battery module (power storage device) in which a side separator (insulating member) is arranged between a battery (power storage element) and a restraining member (side plate).

WO2020/166182

In the conventional power storage device described above, the side plate may have a protrusion (hereinafter referred to as a plate protrusion) that protrudes toward the power storage element and faces the power storage element in the vertical direction. In this case, the insulating member has a protrusion (hereinafter referred to as an insulating protrusion) that protrudes between the storage element and the plate protrusion to provide insulation between the storage element and the plate protrusion. In Patent Document 1, the restraining member (side plate) protrudes toward the battery (storage element) and has an arm (plate protrusion) facing the battery in the vertical direction, and the side separator (insulating member) It has a second portion and a third portion (insulating protrusion) between the battery and the arm. In such a configuration, in the above-described conventional power storage device, the protrusion amount of the insulating protrusion may be formed long in order to ensure insulation between the power storage element and the plate protrusion. However, if the protruding amount of the insulating protruding part is long, it is not possible to secure space for arranging the cooling equipment or the space for arranging the members (parts on the vehicle side, etc.) for installing the power storage device. It may not be possible to do so.

An object of the present invention is to provide a power storage device that can save space by focusing on the above problem.

A power storage device according to an aspect of the present invention includes a power storage element, a side plate arranged to the side of the power storage element in a first direction, an insulating member arranged between the power storage element and the side plate, wherein the side plate includes: a plate main body facing the power storage element in the first direction; and a plate main body projecting in the first direction from the plate main body and intersecting the first direction. a plate projecting portion facing the storage element in a second direction, the insulating member comprising: an insulating body portion disposed between the storage element and the plate body portion; and an insulating protrusion that protrudes in one direction and is arranged between the power storage element and the plate protrusion in the second direction, wherein the power storage device includes the insulating protrusion on the plate protrusion. A fixing member for fixing is provided.

A power storage device according to an aspect of the present invention includes a power storage element, a side plate arranged to the side of the power storage element in a first direction, an insulating member arranged between the power storage element and the side plate, wherein the side plate includes: a plate main body facing the power storage element in the first direction; and a plate main body projecting in the first direction from the plate main body and intersecting the first direction. a pair of plate protrusions facing the storage element on both sides in the second direction, and the insulating member includes an insulating main body disposed between the storage element and the plate main body, and the insulating main body. a pair of insulating protrusions protruding from the portion in the first direction and arranged between the storage element and the pair of plate protrusions in the second direction, wherein the pair of insulating protrusions One is attached to one of the pair of plate projecting portions, and the other of the pair of insulating projecting portions is a first portion projecting from the insulating main body portion in the first direction, and a portion extending from the first portion to the second portion. and a tip portion connected to the second portion, wherein the tip portion does not protrude in a direction away from the power storage element in the second direction more than the plate protruding portion. placed in position.

The present invention can be realized not only as such a power storage device, but also as a combination of a side plate, an insulating member and a fixing member, a combination of an insulating member and a fixing member, a combination of a fixing member, a side plate and an insulating member, or It can also be realized as an insulating member.

According to the power storage device of the present invention, space can be saved.

1 is a perspective view showing an appearance of a power storage device according to an embodiment; FIG. FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is exploded; 1 is a perspective view showing a configuration of an electric storage element according to an embodiment; FIG. FIG. 3 is a perspective view showing configurations of an insulating member and a fixing member according to the embodiment; FIG. 4 is a cross-sectional view showing a configuration in which an insulating member according to an embodiment is fixed to a side plate by a fixing member; FIG. 9 is a cross-sectional view showing a configuration in which an insulating member according to Modification 1 of the embodiment is fixed to a side plate by a fixing member; FIG. 9 is a cross-sectional view showing a configuration in which an insulating member according to Modification 1 of the embodiment is fixed to a side plate by a fixing member; FIG. 11 is a cross-sectional view showing a configuration in which an insulating member is arranged on a side plate according to Modification 2 of the embodiment; FIG. 11 is a cross-sectional view showing a configuration in which an insulating member is arranged on a side plate according to Modification 2 of the embodiment; FIG. 11 is a cross-sectional view showing a configuration in which an insulating member according to Modification 3 of the embodiment is fixed to a side plate by a fixing member; FIG. 11 is a cross-sectional view showing a configuration in which an insulating member according to Modification 3 of the embodiment is fixed to a side plate by a fixing member;

A power storage device according to an aspect of the present invention includes a power storage element, a side plate arranged to the side of the power storage element in a first direction, an insulating member arranged between the power storage element and the side plate, wherein the side plate includes: a plate main body facing the power storage element in the first direction; and a plate main body projecting in the first direction from the plate main body and intersecting the first direction. a plate projecting portion facing the storage element in a second direction, the insulating member comprising: an insulating body portion disposed between the storage element and the plate body portion; and an insulating protrusion that protrudes in one direction and is arranged between the power storage element and the plate protrusion in the second direction, wherein the power storage device includes the insulating protrusion on the plate protrusion. A fixing member for fixing is provided.

According to this, in the power storage device, the insulating member has an insulating projecting portion that projects in the first direction from the insulating main body portion and that is arranged between the energy storage element and the plate projecting portion of the side plate in the second direction. A fixing member is arranged to fix the insulating protrusion to the plate protrusion. By fixing the insulating protrusion to the plate protrusion with the fixing member in this manner, the insulating protrusion can be fixed to the plate protrusion at a predetermined position. For this reason, in order to ensure insulation between the storage element and the plate protrusion, the protrusion of the insulation protrusion should be considered to avoid misalignment of the protrusion with respect to the plate protrusion. There is no need to keep the volume forming for a long time. As a result, it is possible to suppress the amount of protrusion of the insulating protruding portion from increasing, so that space saving (downsizing) of the power storage device can be achieved.

The fixing member may fix the insulating protrusion to the plate protrusion by sandwiching the insulating protrusion and the plate protrusion in the second direction.

According to this, the fixing member sandwiches the insulating projecting portion of the insulating member and the plate projecting portion of the side plate, so that the insulating projecting portion can be easily fixed to the plate projecting portion. As a result, it is possible to easily suppress an increase in the amount of protrusion of the insulating protrusion, so that space saving (downsizing) of the power storage device can be easily achieved.

The insulating projecting portion may have a first portion projecting from the insulating body portion in the first direction and a second portion bending from the first portion in the second direction.

According to this, in the insulating projecting portion of the insulating member, by providing the second portion that bends in the second direction from the first portion that projects in the first direction from the insulating body portion, the insulating projecting portion projects in the first direction. You can control the lengthening of the volume. As a result, space saving (downsizing) of the power storage device can be achieved.

The second portion may be bent in a direction from the first portion toward the power storage element in the second direction.

According to this, in the insulating projecting portion of the insulating member, by bending the second portion in the direction facing the electric storage element, it is possible to suppress the insulating projecting portion from projecting in the direction away from the electric storage element in the second direction. Thereby, space saving (downsizing) of the power storage device can be achieved also in the second direction.

The insulating protruding portion further has a tip connected to the second portion, and the tip is arranged at a position that does not protrude further away from the power storage element in the second direction than the plate protruding portion. may be

According to this, in the insulating projecting portion of the insulating member, by arranging the distal end portion at a position that does not project in the direction away from the storage element more than the plate projecting portion, the insulating projecting portion is located at the plate projecting portion in the second direction. It can be suppressed to protrude more than Thereby, space saving (downsizing) of the power storage device can be achieved also in the second direction. By arranging the tip of the insulating protrusion at a position that does not protrude further than the plate protrusion, it is possible to prevent the insulating protrusion from interfering with other members and causing damage such as breakage. If the insulating protrusion can be prevented from being damaged, the thickness of the insulating protrusion can be reduced because it is not necessary to form a thick insulating protrusion so as not to damage the insulating protrusion. Also by this, space saving (downsizing) of the power storage device can be achieved.

The insulating protrusions may be arranged to sandwich the plate protrusions in the second direction.

According to this, by arranging the insulating protrusions of the insulating member so as to sandwich the plate protrusion, the electric storage element and the plate protrusion can be effectively insulated by the insulating protrusions. As a result, it is possible to achieve space saving (miniaturization) of the power storage device while effectively insulating the power storage element and the plate protrusion.

A power storage device according to an aspect of the present invention includes a power storage element, a side plate arranged to the side of the power storage element in a first direction, an insulating member arranged between the power storage element and the side plate, wherein the side plate includes: a plate main body facing the power storage element in the first direction; and a plate main body projecting in the first direction from the plate main body and intersecting the first direction. a pair of plate protrusions facing the storage element on both sides in the second direction, and the insulating member includes an insulating main body disposed between the storage element and the plate main body, and the insulating main body. a pair of insulating protrusions protruding from the portion in the first direction and arranged between the storage element and the pair of plate protrusions in the second direction, wherein the pair of insulating protrusions One is attached to one of the pair of plate projecting portions, and the other of the pair of insulating projecting portions is a first portion projecting from the insulating main body portion in the first direction, and a portion extending from the first portion to the second portion. and a tip portion connected to the second portion, wherein the tip portion does not protrude in a direction away from the power storage element in the second direction more than the plate protruding portion. placed in position.

In the electric storage device, when one of the pair of insulating projecting portions of the insulating member is attached to one of the pair of plate projecting portions of the side plate, the other of the pair of insulating projecting portions has a longer protrusion in order to ensure clearance. you may need to. If the protruding amount of the insulating protruding portion is long, there is a possibility that space saving (miniaturization) cannot be achieved. Accordingly, the other of the pair of insulating projecting portions is provided with a second portion that bends in the second direction from a first portion that projects in the first direction from the insulating body portion. In addition, the tip portion connected to the second portion is arranged at a position that does not protrude in the direction away from the storage element in the second direction more than the plate protruding portion. As a result, it is possible to suppress the amount of protrusion of the insulating projecting portion in the first direction from becoming longer, and it is possible to suppress the projecting of the insulating projecting portion in the direction away from the power storage element in the second direction as well. Space saving (downsizing) can be achieved. By arranging the tip of the insulating protrusion at a position that does not protrude further than the plate protrusion, it is possible to prevent the insulating protrusion from interfering with other members and causing damage such as breakage. If the insulating protrusion can be prevented from being damaged, the thickness of the insulating protrusion can be reduced because it is not necessary to form a thick insulating protrusion so as not to damage the insulating protrusion. Also by this, space saving (downsizing) of the power storage device can be achieved.

Hereinafter, power storage devices according to embodiments of the present invention (including modifications thereof) will be described with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, manufacturing processes, order of manufacturing processes, and the like shown in the following embodiments are examples, and are not intended to limit the present invention. In each drawing, dimensions and the like are not strictly illustrated. In each figure, the same reference numerals are given to the same or similar components.

In the following description and drawings, the direction in which a pair of electrode terminals in one storage element are arranged, the direction in which a pair of short sides of a container of one storage element are opposed, the direction in which a pair of side plates are arranged, or the direction in which a pair of insulating members are arranged is defined as the X-axis direction. The direction in which a plurality of energy storage elements are arranged, the direction in which a plurality of spacers are arranged, the direction in which a pair of end plates are arranged, the direction in which the energy storage element, the spacer, and the end plate are arranged, the direction in which a pair of long sides of a container of one energy storage element face each other, Alternatively, the thickness direction of the storage element, spacer, or end plate is defined as the Y-axis direction. The direction in which the container body and lid of the container for the storage element are arranged, or the vertical direction, is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that cross each other (perpendicularly in this embodiment). Although the Z-axis direction may not be the vertical direction depending on the mode of use, the Z-axis direction will be described below for convenience of explanation.

In the following description, for example, the positive direction of the X-axis indicates the arrow direction of the X-axis, and the negative direction of the X-axis indicates the direction opposite to the positive direction of the X-axis. When simply referred to as the X-axis direction, it indicates either or both of the X-axis plus direction and the X-axis minus direction. The same applies to the Y-axis direction and the Z-axis direction. Hereinafter, the X-axis direction may also be referred to as the first direction, and the Z-axis direction may also be referred to as the second direction. Expressions indicating relative directions or orientations, such as parallel and orthogonal, also include cases where the directions or orientations are not strictly speaking. For example, two directions being parallel not only means that the two directions are completely parallel, but also being substantially parallel, that is, including a difference of about several percent, for example. means. Furthermore, in the following description, the expression "insulation" means "electrical insulation".

(Embodiment)
[1 General description of power storage device 10]
First, a general description of power storage device 10 in the present embodiment will be given. FIG. 1 is a perspective view showing the appearance of power storage device 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when power storage device 10 according to the present embodiment is exploded.

Power storage device 10 is a device capable of charging electricity from the outside and discharging electricity to the outside, and has a substantially rectangular parallelepiped shape in the present embodiment. For example, the power storage device 10 is a battery module (assembled battery) used for power storage or power supply. Specifically, the power storage device 10 is, for example, an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a rolling stock for an electric railway. It is used as a battery etc. Examples of the vehicles include electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and fossil fuel (gasoline, light oil, liquefied natural gas, etc.) vehicles. Examples of railway vehicles for the electric railway include electric trains, monorails, linear motor cars, and hybrid trains having both diesel engines and electric motors. The power storage device 10 can also be used as a stationary battery or the like for home or business use.

As shown in FIGS. 1 and 2, the power storage device 10 includes a plurality of power storage elements 100, a plurality of spacers 200, a pair of end plates 400, a pair of side plates 500, a pair of insulating members 600, a pair of and a fixing member 700 of. The power storage device 10 also includes a bus bar that connects the power storage elements 100 in series or in parallel, but illustration and description thereof are omitted. In addition to the components described above, the power storage device 10 includes a busbar frame for positioning the busbars, an exterior body for housing the components, external terminals connected to external busbars, etc., and the state of charge of the power storage element 100. Also, a circuit board, fuses, relays, connectors, and other electric devices for monitoring or controlling the discharge state may be provided.

The storage element 100 is a secondary battery (single battery) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The power storage element 100 has a flat rectangular parallelepiped shape (rectangular shape), and in the present embodiment, eight power storage elements 100 are arranged side by side in the Y-axis direction. The size and shape of the power storage element 100, the number of power storage elements 100 to be arranged, and the like are not limited, and for example, only one power storage element 100 may be arranged. The storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor. The power storage device 100 may be a primary battery that can use stored electricity without being charged by the user, instead of a secondary battery. The storage element 100 may be a battery using a solid electrolyte. The storage element 100 may be a pouch-type storage element. A detailed description of the configuration of the storage element 100 will be given later.

Spacer 200 is a plate-like member arranged adjacent to storage element 100 and insulating storage element 100 from other members. The spacers 200 are arranged in the Y-axis plus direction or the Y-axis minus direction of the energy storage elements 100 to insulate between two adjacent energy storage elements 100 and between the edge energy storage elements 100 and the end plates 400 . . The spacer 200 also covers the X-axis direction both ends of the short side surface (the short side surface 112 described later), the bottom surface (the bottom surface 113 described later), and the X-axis direction both ends of the top surface (the lid body 130 described later) of the storage element 100 . are arranged as follows. In the present embodiment, nine spacers 200 are arranged corresponding to eight power storage elements 100, but the arrangement position and number of spacers 200 are not particularly limited. The spacer 200 is made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET ), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyamide (PA), It is made of an insulating member such as ABS resin or a composite material thereof, a metal coated with an insulating coating, or a member having a heat insulating property such as a damper material.

The end plate 400 and the side plate 500 are restraining members that externally press (restrain) the power storage elements 100 in the direction in which the plurality of power storage elements 100 are arranged (the Y-axis direction). That is, the end plates 400 and the side plates 500 sandwich the plurality of power storage elements 100 from both sides in the alignment direction, thereby pressing (restraining) the power storage elements 100 included in the plurality of power storage elements 100 from both sides in the alignment direction. )do. The end plate 400 and the side plate 500 are formed of a metal member such as steel or stainless steel from the viewpoint of ensuring strength, but the material is not particularly limited. It may be formed, or an insulating treatment may be applied to a metal member.

The end plates 400 are arranged on both sides of the plurality of energy storage elements 100 and the plurality of spacers 200 in the Y-axis direction, and sandwich and hold the plurality of energy storage elements 100 and the like from both sides in the alignment direction (Y-axis direction). It is a restraint member having a shape (flat block shape). The pair of end plates 400 are arranged at positions sandwiching the plurality of energy storage elements 100 and the plurality of spacers 200 in the Y-axis direction (the stacking direction of the electrode bodies of the electrode bodies of the energy storage elements 100) to constrain them.

The side plate 500 is a plate-shaped and elongated restraining member arranged on the side of the plurality of power storage elements 100 and the plurality of spacers 200 in the X-axis direction (first direction). Specifically, the side plate 500 is arranged on the side of the insulating member 600 so that the insulating member 600 is sandwiched between the plurality of power storage elements 100 and the plurality of spacers 200 in the X-axis direction. Both ends of the side plate 500 are attached to the pair of end plates 400 , and by connecting the pair of end plates 400 , the plurality of power storage elements 100 and the plurality of spacers 200 are constrained. The side plate 500 is arranged so as to extend in the Y-axis direction so as to straddle the plurality of storage elements 100 and the plurality of spacers 200, and the side plate 500 extends in the direction of arrangement (Y-axis direction) with respect to the plurality of storage elements 100 and the like. give restraint.

In this embodiment, a pair of side plates 500 are arranged on both sides of the plurality of energy storage elements 100 and the plurality of spacers 200 in the X-axis direction. The pair of side plates 500 are attached to the X-axis direction end portions of the pair of end plates 400 at both Y-axis direction end portions. Accordingly, the pair of side plates 500 and the pair of end plates 400 sandwich and constrain the plurality of power storage elements 100 and the like from both sides in the X-axis direction and both sides in the Y-axis direction. Specifically, the side plate 500 is connected (joined) to the end plate 400 by a plurality of (three in this embodiment) connecting members 500a arranged in the Z-axis direction. In the present embodiment, connecting member 500a is a bolt (screw), and is fastened by screwing with a female threaded portion formed in end plate 400. As shown in FIG. The connection (joining) of the side plate 500 to the end plate 400 is not limited to fixing with bolts (screws), and may be joined by welding, adhesion, or the like.

The side plate 500 has a plate body portion 510 and a pair of plate projecting portions 520 and 530 (see FIGS. 2 and 5, etc.). Plate body portion 510 is a portion arranged to face storage element 100 in the X-axis direction (first direction). Specifically, the plate main body portion 510 is arranged to face the insulating main body portion 610 of the insulating member 600 to be described later in the X-axis direction, and is parallel to the YZ plane extending in the Y-axis direction. is the part of That is, the plate body portion 510 is arranged at a position sandwiching the insulating body portion 610 between the plurality of power storage elements 100 and the plurality of spacers 200 in the X-axis direction. The plate body portion 510 is arranged in contact with the insulating body portion 610 in the X-axis direction.

The pair of plate protrusions 520 and 530 protrude from the plate main body 510 in the X-axis direction (first direction) and face the storage element 100 on both sides in the Z-axis direction (second direction intersecting the first direction). It is a part to do. Specifically, the plate projecting portion 520 projects in the X-axis direction from the end of the plate main body portion 510 in the positive direction of the Z-axis toward the power storage element 100 and extends in the Y-axis direction. It is a plate-like portion and is arranged in the Z-axis plus direction of the storage element 100 . In the present embodiment, the plate protruding portion 520 is arranged at a position sandwiching the insulating protruding portion 620 of the insulating member 600, which will be described later, between the plurality of power storage elements 100 and the plurality of spacers 200 in the Z-axis direction. Specifically, the plate projecting portion 520 is arranged in a state in which it is inserted and fitted into the insulating projecting portion 620 from the X-axis direction (see FIG. 5 and the like).

The plate projecting portion 530 is a long flat plate-like portion that projects in the X-axis direction from the end of the plate main body portion 510 in the negative Z-axis direction toward the power storage element 100 and extends in the Y-axis direction. and is arranged in the negative Z-axis direction of the power storage element 100 . In the present embodiment, the plate protrusion 530 is arranged at a position sandwiching the insulating protrusion 630 of the insulating member 600 described later with the plurality of power storage elements 100 and the plurality of spacers 200 . Specifically, the plate projecting portion 530 is arranged in a state in which it is inserted and fitted into the insulating projecting portion 630 from the X-axis direction (see FIG. 5, etc.). The plate protrusion 530 is longer than the plate protrusion 520 in the X-axis direction.

The insulating members 600 are plate-shaped and elongated insulating members (insulators) arranged on both sides of the plurality of power storage elements 100 and the plurality of spacers 200 in the X-axis direction and extending in the Y-axis direction. The insulating member 600 is arranged between the plurality of power storage elements 100 and the like and the side plate 500 so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200 . Thereby, the insulating member 600 insulates the power storage elements 100 from the side plate 500 . The insulating member 600 may be made of any material as long as it has insulating properties. In this embodiment, the insulating member 600 is a thin member (thin film) having a thickness of about several tenths of a millimeter.

The insulating member 600 has an insulating body portion 610 and a pair of insulating projecting portions 620 and 630 (see FIGS. 2 and 4, etc.). The insulating main body portion 610 is arranged between the storage element 100 and the plate main body portion 510 and is a plate-like and rectangular portion extending in the Y-axis direction and parallel to the YZ plane. Specifically, the insulating main body portion 610 is arranged between the plurality of power storage elements 100 and the plurality of spacers 200 and the plate main body portion 510 in the X-axis direction. The insulating main body portion 610 is arranged at a position facing the center portion (the center portion (including the center) of the short side surface 112) of the power storage element 100 in the Z-axis direction (second direction) in the X-axis direction. Specifically, the insulating body portions 610 are arranged at positions facing each other in the X-axis direction from one end to the other end in the Z-axis direction of the short side surface 112 of the power storage element 100 . The insulating body portion 610 is arranged in contact with the side walls of the plurality of spacers 200 in the X-axis direction in the X-axis direction. It may be arranged in contact with the short side 112 .

The pair of insulating protrusions 620 and 630 protrude from the insulating main body 610 in the X-axis direction (first direction), and extend from the power storage element 100 and the pair of plate protrusions 520 and 530 in the Z-axis direction (second direction). It is a part located between Specifically, the insulating projecting portion 620 projects in the X-axis direction from the end of the insulating main body portion 610 in the positive Z-axis direction toward the storage element 100 and extends in the Y-axis direction. It is a plate-like part. The insulating projecting portion 620 abuts on the upper wall of the plurality of spacers 200 in the positive Z-axis direction at the ends of the plurality of spacers 200 in the positive Z-axis direction in the Z-axis direction. placed in a state. The insulating protruding portion 630 is a long plate-like portion that protrudes in the X-axis direction from the end of the insulating main body portion 610 in the negative direction of the Z-axis toward the storage element 100 and extends in the Y-axis direction. be. The insulating protrusions 630 are arranged in the negative Z-axis direction of the plurality of energy storage elements 100 and the plurality of spacers 200 . The insulation protrusion 630 is longer than the insulation protrusion 620 in the X-axis direction. A more detailed description of the configuration of the insulating member 600 (insulating protrusions 620 and 630) will be given later.

The fixing member 700 is a member that fixes the insulating member 600 to the side plate 500 . A pair of fixing members 700 are arranged corresponding to the pair of insulating members 600 and the pair of side plates 500 . Specifically, the fixing member 700 is a flat and elongated member parallel to the XY plane, extending in the Y-axis direction along the insulating protrusion 630 and the plate protrusion 530. is fixed to the plate protrusion 530 . The fixing member 700 is arranged in contact with the bottom wall of the plurality of spacers 200 in the negative Z-axis direction at the ends of the plurality of spacers 200 in the negative Z-axis direction. Although the fixing member 700 may be made of any material, it can be made of any insulating material that can be used for the spacer 200, for example. A detailed description of the configuration of the fixing member 700 will be given later.

[2 Explanation of storage element 100]
Next, the configuration of the storage element 100 will be described in detail. FIG. 3 is a perspective view showing the structure of the storage device 100 according to this embodiment. FIG. 3 shows an enlarged appearance of one power storage element 100 out of the plurality of power storage elements 100 shown in FIG. Since the plurality of power storage elements 100 all have the same configuration, the configuration of one power storage element 100 will be described in detail below.

As shown in FIG. 3 , the power storage device 100 includes a container 110 , a pair of electrode terminals 140 (positive electrode side and negative electrode side), and an upper gasket 150 . Inside the container 110, a lower gasket, an electrode body, a pair of current collectors (positive electrode side and negative electrode side), an electrolytic solution (non-aqueous electrolyte), etc. are accommodated, but illustration of these is omitted. . As the electrolytic solution, the type thereof is not particularly limited as long as it does not impair the performance of the electric storage element 100, and various kinds can be selected.

In addition to the components described above, the electric storage element 100 may include spacers arranged on the side or below the electrode body, an insulating film that wraps the electrode body and the like, and the like. Furthermore, an insulating film (shrink tube or the like) covering the outer surface of the container 110 may be arranged around the container 110 . The material of the insulating film is not particularly limited as long as it can ensure the insulation required for the electric storage element 100. Examples include insulating resins such as PC, PP, PE, PPS, PET, PBT, and ABS resins, Epoxy resin, Kapton (registered trademark), Teflon (registered trademark), silicon, polyisoprene, polyvinyl chloride, and the like can be exemplified.

The container 110 is a rectangular parallelepiped (square or box-shaped) case having a container body 120 with an opening and a lid 130 closing the opening of the container body 120 . The container main body 120 is a rectangular tubular member that constitutes the main body of the container 110 and has a bottom, and an opening is formed on the Z-axis positive direction side. The lid body 130 is a rectangular plate-like member that constitutes the lid portion of the container 110 , and is arranged to extend in the X-axis direction in the positive Z-axis direction of the container body 120 . The container 110 (lid 130) has a gas discharge valve that releases the pressure when the pressure inside the container 110 is excessively increased, and an injection part for injecting an electrolytic solution into the container 110. etc. may be provided. The material of the container 110 (the container body 120 and the lid 130) is not particularly limited, and can be, for example, a weldable (bondable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate. can also be used.

The container 110 has a structure in which the inside is hermetically sealed by joining the container body 120 and the lid 130 by welding or the like after housing the electrode body and the like inside the container body 120 . The container 110 has a pair of long side surfaces 111 on both side surfaces in the Y-axis direction, a pair of short side surfaces 112 on both side surfaces in the X-axis direction, and a bottom surface 113 on the negative Z-axis direction side. The long side surface 111 is a rectangular planar portion that forms the long side surface of the container 110 and is arranged to face the adjacent spacers 200 in the Y-axis direction. Long side 111 is adjacent to short side 112 and bottom 113 and has a larger area than short side 112 . The short side surface 112 is a rectangular planar portion that forms the short side surface of the container 110 and is arranged to face the side plate 500 and the insulating member 600 in the X-axis direction. Short side 112 is adjacent to long side 111 and bottom 113 and has a smaller area than long side 111 . The bottom surface 113 is a rectangular planar portion that forms the bottom surface of the container 110 and is arranged adjacent to the long side surface 111 and the short side surface 112 .

The electrode terminal 140 is a terminal member (a positive electrode terminal and a negative electrode terminal) of the storage element 100 arranged in the lid 130, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via a current collector. there is That is, the electrode terminal 140 is made of a metal material for leading electricity stored in the electrode body to the external space of the storage element 100 and for introducing electricity into the internal space of the storage element 100 to store the electricity in the electrode body. It is a member made of The electrode terminal 140 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

The electrode assembly is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate is formed by forming a positive electrode active material layer on a positive electrode substrate layer, which is a collector foil made of a metal such as aluminum or an aluminum alloy. The negative electrode plate is formed by forming a negative electrode active material layer on a negative electrode substrate layer, which is a collector foil made of a metal such as copper or a copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be appropriately used as long as it can intercalate and deintercalate lithium ions. A microporous sheet made of resin, a non-woven fabric, or the like can be used as the separator. In the present embodiment, the electrode body is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the Y-axis direction. The electrode body includes a wound electrode body formed by winding electrode plates (a positive electrode plate and a negative electrode plate), and a laminated type (stacked) electrode body formed by stacking a plurality of flat plate-shaped electrode plates. or a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape.

The current collectors are conductive members (a positive electrode current collector and a negative electrode current collector) that are electrically connected to the electrode terminal 140 and the electrode body. The positive electrode current collector is made of aluminum, an aluminum alloy, or the like, like the positive electrode substrate layer of the positive electrode plate, and the negative electrode current collector, like the negative electrode substrate layer of the negative electrode plate, is made of copper, a copper alloy, or the like. there is

The upper gasket 150 is a gasket that is arranged between the lid 130 and the electrode terminal 140 to insulate and seal between the lid 130 and the electrode terminal 140 . The lower gasket is a gasket that is placed between the lid 130 and the current collector to insulate and seal between the lid 130 and the current collector. The upper gasket 150 and the lower gasket may be made of any material as long as it has insulating properties.

[3 Description of insulating member 600 and fixing member 700]
Next, configurations of the insulating member 600 and the fixing member 700 will be described in detail. FIG. 4 is a perspective view showing the configuration of insulating member 600 and fixing member 700 according to the present embodiment. Specifically, (a) of FIG. 4 shows an enlarged view of the insulating member 600 and the fixing member 700 in the positive direction of the X-axis among the pair of insulating members 600 and the pair of fixing members 700 shown in FIG. It is a perspective view. (b) of FIG. 4 is a perspective view showing a configuration in which the insulating member 600 and the fixing member 700 shown in (a) of FIG. 4 are rotated by 180° around the Z-axis.

FIG. 5 is a cross-sectional view showing a configuration in which insulating member 600 according to the present embodiment is fixed to side plate 500 with fixing member 700. As shown in FIG. Specifically, FIG. 5(a) omits components other than the side plate 500, the insulating member 600, and the fixing member 700, and shows a state in which the insulating member 600 is fixed to the side plate 500 parallel to the XZ plane. It shows a cross section when cut along a plane. (a) of FIG. 5 shows a state in which the insulating member 600 and the side plate 500 in the plus direction of the X-axis among the pair of insulating members 600 and the pair of side plates 500 shown in FIG. 2 are assembled. (b) of FIG. 5 shows an enlarged end portion of the configuration shown in (a) of FIG. 5 in the positive direction of the Z axis, and (c) of FIG. 5 shows the configuration shown in (a) of FIG. is shown in an enlarged manner at the end of the Z-axis minus direction.

Of the pair of side plates 500, the pair of insulating members 600, and the pair of fixing members 700 shown in FIG. have a shape. Therefore, the configuration in the positive direction of the X-axis will be mainly described below as shown in FIGS. 4 and 5, and the description of the configuration in the negative direction of the X-axis will be simplified or omitted.

As described above, the insulating member 600 has an insulating body portion 610 and a pair of insulating protrusions 620 and 630, and the pair of insulating protrusions 620 and 630 will be described in detail below. As shown in FIGS. 4 and 5 , the insulating protrusion 620 has a first portion 621 , a second portion 622 and a tip portion 623 .

The first portion 621 is a portion protruding from the insulating main body portion 610 in the X-axis direction (first direction). Specifically, the first portion 621 protrudes in the negative direction of the X-axis (the direction facing the power storage element 100) from the end of the insulating main body portion 610 in the positive direction of the Z-axis, and extends in the Y-axis direction. It is a shaku-shaped and flat plate-shaped part. The first portion 621 is arranged in the negative Z-axis direction of the plate protrusion 520 of the side plate 500 and in the positive Z-axis direction of the plurality of power storage elements 100 and the plurality of spacers 200 . The first portion 621 abuts on the surface of the plate protrusion 520 in the negative direction of the Z-axis and the upper wall of the positive end of the plurality of spacers 200 in the positive direction of the Z-axis in the Z-axis direction. placed in a state. Depending on the shape or the like of spacer 200 , first portion 621 may be arranged in contact with the end of lid 130 of container 110 of power storage element 100 in the positive X-axis direction.

The second portion 622 is a portion bent in the Z-axis direction (second direction) from the first portion 621 . Specifically, the second portion 622 extends in the positive Z-axis direction by bending in the positive Z-axis direction from the end of the first portion 621 in the negative X-axis direction (the end on the power storage element 100 side). It is an elongated flat plate-shaped portion extending in the direction of the arrow. The second portion 622 is arranged in the negative X-axis direction of the plate protrusion 520 of the side plate 500 . In the present embodiment, the second portion 622 is arranged in contact with the end surface of the plate projecting portion 520 in the negative direction of the X axis, but does not have to be in contact.

Tip 623 is the tip portion of insulating protrusion 620 that is connected to second portion 622 . Specifically, the tip portion 623 extends in the positive X-axis direction by bending from the end of the second portion 622 in the positive Z-axis direction (the direction away from the power storage element 100 in the X-axis direction), and It is an elongated plate-shaped portion extending in the Y-axis direction. In the present embodiment, tip portion 623 has a shape in which the tip in the positive direction of the X-axis is curved in the positive direction of the Z-axis. Furthermore, the tip portion 623 has a convex portion 623a that protrudes in the negative Z-axis direction. The convex portion 623a is a bulging portion in which the negative Z-axis direction surface of the distal end portion 623 protrudes in the negative Z-axis direction and the positive Z-axis direction surface of the distal end portion 623 is recessed in the negative Z-axis direction. The distal end portion 623 is provided with a plurality of (five in this embodiment) convex portions 623a arranged in the Y-axis direction. The tip portion 623 is arranged in the Z-axis plus direction of the plate protrusion 520 of the side plate 500, and is arranged in a state where the convex portion 623a is in contact with the surface of the plate protrusion 520 in the Z-axis plus direction.

In this manner, the insulating projecting portion 620 is arranged so as to sandwich the plate projecting portion 520 in the Z-axis direction (second direction). That is, the insulating projecting portion 620 protrudes in the negative direction of the X-axis from the end of the insulating main body portion 610 in the positive direction of the Z-axis, is bent in the positive direction of the Z-axis, and is bent in the positive direction of the X-axis as viewed from the negative direction of the Y-axis. It has a substantially C-shaped shape. As a result, a recess recessed in the negative direction of the X-axis is formed in the insulating projecting portion 620 , and the plate projecting portion 520 is inserted and fitted into this recessed portion, and the insulating projecting portion 620 is attached to the plate projecting portion 520 . The insulating projecting portion 620 has a shape in which the plate projecting portion 520 can be easily inserted because the tip of the tip portion 623 in the positive direction of the X axis is curved in the positive direction of the Z axis.

The insulating projecting portion 630 also has a configuration similar to that of the insulating projecting portion 620 . That is, the insulating projecting portion 630 has a first portion 631 , a second portion 632 and a tip portion 633 .

The first portion 631 is a portion protruding from the insulating body portion 610 in the X-axis direction (first direction). Specifically, the first portion 631 protrudes in the negative direction of the X-axis (the direction facing the power storage element 100) from the end of the insulating body portion 610 in the negative direction of the Z-axis, and extends in the Y-axis direction. It is a shaku-shaped and flat plate-shaped part. The first portion 631 is arranged in the Z-axis positive direction of the plate protrusion 530 of the side plate 500 and in the Z-axis negative direction of the plurality of power storage elements 100 and the plurality of spacers 200 . The first portion 631 is arranged in contact with the surface of the plate projecting portion 530 in the positive Z-axis direction in the Z-axis direction.

The second portion 632 is a portion bent in the Z-axis direction (second direction) from the first portion 631 . Specifically, the second portion 632 extends in the negative Z-axis direction by bending in the negative Z-axis direction from the end of the first portion 631 in the negative X-axis direction (the end on the power storage element 100 side). It is an elongated flat plate-shaped portion extending in the direction of the arrow. The second portion 632 is arranged in the negative X-axis direction of the plate protrusion 530 of the side plate 500 . In the present embodiment, the second portion 632 is arranged in contact with the end face of the plate projecting portion 530 in the negative direction of the X axis, but it does not have to be in contact.

The tip portion 633 is the tip portion of the insulating protrusion 630 that is connected to the second portion 632 . Specifically, the tip portion 633 extends in the positive X-axis direction by bending in the positive X-axis direction (the direction away from the power storage element 100 in the X-axis direction) from the end of the second portion 632 in the negative Z-axis direction, and It is an elongated plate-like portion extending in the Y-axis direction. Further, the tip portion 633 has a convex portion 633a that protrudes in the positive direction of the Z axis. The convex portion 633a is a bulging portion in which the surface of the tip portion 633 in the positive Z-axis direction protrudes in the positive Z-axis direction and the surface of the tip portion 633 in the negative Z-axis direction is recessed in the positive Z-axis direction. The distal end portion 633 is provided with a plurality of (five in this embodiment) convex portions 633a arranged in the Y-axis direction. The tip portion 633 is arranged in the negative Z-axis direction of the plate protrusion 530 of the side plate 500, and is arranged in a state where the convex portion 633a is in contact with the surface of the plate protrusion 530 in the negative Z-axis direction.

In this manner, the insulating projecting portion 630 is arranged so as to sandwich the plate projecting portion 530 in the Z-axis direction (second direction). That is, the insulating projecting portion 630 protrudes in the negative direction of the X-axis from the end of the insulating main body portion 610 in the negative direction of the Z-axis, is bent in the negative direction of the Z-axis, and is bent in the positive direction of the X-axis as viewed from the negative direction of the Y-axis. It has a substantially C-shaped shape. As a result, a recess recessed in the negative direction of the X-axis is formed in the insulating projecting portion 630 , and the plate projecting portion 530 is inserted and fitted into this recessed portion, and the insulating projecting portion 630 is attached to the plate projecting portion 530 .

The fixing member 700 has a first wall portion 710 , a connecting portion 720 and a second wall portion 730 . The first wall portion 710 is arranged in the Z-axis plus direction of the second wall portion 730 so as to face the second wall portion 730 in the Z-axis direction, and is elongated parallel to the XY plane and extending in the Y-axis direction. It is a flat plate-shaped part. In the present embodiment, first wall portion 710 has a shape in which the tip in the positive direction of the X-axis is bent in the positive direction of the Z-axis. The first wall portion 710 is arranged in a state of being in contact with the first portion 631 of the insulating projecting portion 630 at a position sandwiching the first portion 631 of the insulating projecting portion 630 with the plate projecting portion 530 in the Z-axis direction. That is, the first wall portion 710 is arranged in the positive Z-axis direction of the first portion 631 and in the negative Z-axis direction of the plurality of power storage elements 100 and the plurality of spacers 200 . The first wall portion 710 contacts the surface of the first portion 631 in the positive Z-axis direction and the bottom wall in the negative Z-axis direction of the ends of the plurality of spacers 200 in the positive X-axis direction in the Z-axis direction. It is placed in a state where Depending on the shape of the spacer 200 and the like, the first wall portion 710 may be arranged in contact with the X-axis plus direction end portion of the bottom surface 113 of the container 110 of the power storage element 100 .

The second wall portion 730 is arranged in the negative Z-axis direction of the first wall portion 710 so as to face the first wall portion 710 in the Z-axis direction, and has a length substantially parallel to the XY plane and extending in the Y-axis direction. It is a shaku-shaped and flat plate-shaped part. In the present embodiment, the second wall portion 730 has an inclined surface formed by chamfering the corner portion in the positive Z-axis direction of the tip in the positive X-axis direction. The second wall portion 730 is arranged in contact with the tip portion 633 of the insulating protrusion portion 630 at a position sandwiching the tip portion 633 of the insulating protrusion portion 630 with the plate protrusion portion 530 in the Z-axis direction. In the present embodiment, the second wall portion 730 is longer than the first wall portion 710 and shorter than the tip portion 633 in the X-axis direction. As a result, space can be saved by suppressing the size of the second wall portion 730 within a range in which movement of the tip portion 633 in the negative Z-axis direction can be restricted.

The connecting portion 720 is arranged in the negative X-axis direction of the first wall portion 710 and the second wall portion 730 , and the negative X-axis direction end portion of the first wall portion 710 and the negative X-axis direction end portion of the second wall portion 730 . It is the part that connects the The connecting portion 720 is a long curved plate-like portion that curves in an arc shape (semicircular shape) when viewed from the Y-axis direction and extends in the Y-axis direction. The connecting portion 720 is arranged at a position where the second portion 632 of the insulating projecting portion 630 is sandwiched between the plate projecting portion 530 and the second portion 632 in the X-axis direction. You may arrange|position in the state which contact|abutted.

The connecting portion 720 imparts a biasing force that biases the first wall portion 710 and the second wall portion 730 toward the plate protrusion portion 530 and the insulating protrusion portion 630 . That is, the distance between the first wall portion 710 and the second wall portion 730 is increased by inserting the plate protrusion portion 530 and the insulating protrusion portion 630 between the first wall portion 710 and the second wall portion 730. , the connecting portion 720 is deformed. The first wall portion 710 and the second wall portion 730 are urged toward the plate projecting portion 530 and the insulating projecting portion 630 by the force of the deformation of the connecting portion 720 trying to return, and the fixing member 700 moves toward the insulating projecting portion 630. is fixed to the plate protrusion 530 .

In this way, the fixing member 700 fixes the insulating projecting portion 630 to the plate projecting portion 530 by sandwiching the insulating projecting portion 630 and the plate projecting portion 530 in the Z-axis direction (second direction). It is a substantially C-shaped clip-shaped member. In the fixing member 700, the tip of the first wall portion 710 in the plus direction of the X axis is bent in the plus direction of the Z axis, and the corner of the tip of the second wall portion 730 in the plus direction of the X axis in the plus direction of the Z axis is chamfered. Therefore, the insulating projecting portion 630 and the plate projecting portion 530 are easily inserted. In this embodiment, the fixing member 700 continuously fixes the insulating protrusion 630 to the plate protrusion 530 from one end to the other end of the insulating protrusion 630 in the Y-axis direction. A plurality of fixing members 700 may be arranged side by side in the Y-axis direction, and the plurality of fixing members 700 may intermittently fix the insulating protrusion 630 to the plate protrusion 530 .

[4 Explanation of effects]
As described above, according to power storage device 10 according to the embodiment of the present invention, insulating member 600 protrudes from insulating main body portion 610 in the X-axis direction (first direction) and extends in the Z-axis direction (second direction). ) has an insulating protrusion 630 disposed between the storage element 100 and the plate protrusion 530 of the side plate 500 . In this configuration, a securing member 700 is arranged to secure the insulating protrusion 630 to the plate protrusion 530 . By fixing the insulating protrusion 630 to the plate protrusion 530 with the fixing member 700 as described above, the insulating protrusion 630 can be fixed to the plate protrusion 530 at a predetermined position. Therefore, in order to ensure insulation between the power storage element 100 and the plate protrusion 530, the insulating protrusion 630 may be misaligned with respect to the plate protrusion 530 and may not be positioned accurately. It is not necessary to form the projecting portion 630 to have a long projecting amount. As a result, it is possible to suppress the amount of protrusion (the length in the X-axis direction) of insulating protrusion 630 from increasing, so that space saving (miniaturization) of power storage device 10 can be achieved.

By configuring the fixing member 700 to sandwich the insulating projecting portion 630 of the insulating member 600 and the plate projecting portion 530 of the side plate 500 , the insulating projecting portion 630 can be easily fixed to the plate projecting portion 530 . As a result, it is possible to easily suppress an increase in the amount of projection of insulating projecting portion 630, so that space saving (downsizing) of power storage device 10 can be easily achieved.

In the insulating projecting portion 630 of the insulating member 600, by providing a second portion 632 that bends in the Z-axis direction (second direction) from a first portion 631 that projects in the X-axis direction (first direction) from the insulating main body portion 610, It is possible to suppress the amount of protrusion of the insulating protruding portion 630 in the X-axis direction (first direction) from increasing. Thereby, space saving (miniaturization) of the power storage device 10 can be achieved.

By arranging the insulating protrusions 630 of the insulating member 600 so as to sandwich the plate protrusions 530 , the power storage element 100 and the plate protrusions 530 can be effectively insulated by the insulating protrusions 630 . As a result, it is possible to achieve space saving (miniaturization) of the power storage device 10 while effectively insulating the power storage element 100 and the plate protrusion 530 .

[5 Description of Modifications]
Although power storage device 10 according to the present embodiment has been described above, the present invention is not limited to the above embodiment. The embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all modifications within the meaning and range of equivalents to the claims. .

(Modification 1)
Modification 1 of the above embodiment will be described. 6A and 6B are cross-sectional views showing a configuration in which insulating member 600 according to Modification 1 of the present embodiment is fixed to side plate 500 with fixing member 700. FIG. 6A and 6B are diagrams corresponding to (c) of FIG.

In this modification, the insulating member 600 has an insulating protrusion 630a as shown in FIG. 6A instead of the insulating protrusion 630 in the above embodiment, or an insulating protrusion It has a portion 630b. Other configurations of this modified example are the same as those of the above-described embodiment, so detailed description thereof will be omitted.

As shown in FIG. 6A, the insulating protrusion 630a has a first portion 631, a second portion 632a, and a tip portion 633b. The first part 631 has the same configuration as the first part 631 in the above embodiment. The second portion 632a is a portion that bends from the first portion 631 toward the power storage element 100 in the Z-axis direction (second direction). Specifically, the second portion 632a bends in the positive direction of the Z axis from the end of the first portion 631 in the negative direction of the X axis (the end on the power storage element 100 side), and then bends in the positive direction of the X axis. It is an elongated curved portion extending in the axial direction.

The tip portion 633b is an elongated plate-like portion extending in the positive direction of the X-axis from the end of the second portion 632a in the positive direction of the Z-axis and extending in the Y-axis direction. The tip portion 633b is arranged in a state sandwiched between the first portion 631 and the first wall portion 710 in the Z-axis positive direction of the first portion 631 and in the Z-axis negative direction of the first wall portion 710 of the fixing member 700. . That is, the insulating projecting portion 630a is sandwiched between the first wall portion 710 and the plate projecting portion 530 in a state where the tip portion 633b and the first portion 631 are overlapped (folded). The tip portion 633b may have a protrusion projecting in the Z-axis plus direction or the Z-axis minus direction, similar to the protrusion 633a in the above embodiment.

As shown in FIG. 6B, the insulating protrusion 630b has a first portion 631, a second portion 632b, and a tip portion 633c. The first part 631 has the same configuration as the first part 631 in the above embodiment. The second portion 632b is an elongated curved shape that extends in the Y-axis direction, bending in the negative Z-axis direction from the end of the first portion 631 in the negative X-axis direction and then bending in the positive X-axis direction. It is a part.

The tip portion 633c is an elongated plate-like portion that extends in the positive direction of the X-axis from the end of the second portion 632b in the negative direction of the Z-axis and extends in the Y-axis direction. The distal end portion 633 c is arranged in a state of being sandwiched between the first portion 631 and the plate protrusion 530 in the Z-axis negative direction of the first portion 631 and the Z-axis positive direction of the plate protrusion 530 . That is, the insulating projecting portion 630b is sandwiched between the first wall portion 710 and the plate projecting portion 530 in a state where the tip portion 633c and the first portion 631 are overlapped (folded). The tip portion 633c may have a protrusion projecting in the Z-axis plus direction or the Z-axis minus direction, similar to the protrusion 633a in the above embodiment.

In this way, the tip portions 633b and 633c are arranged at positions that do not protrude further than the plate protruding portion 530 in the Z-axis direction (second direction) away from the storage element 100 (Z-axis negative direction). Specifically, the tip portions 633b and 633c are arranged in the Z-axis plus direction from the plate protrusion portion 530. As shown in FIG. Thereby, the insulating protrusions 630 a and 630 b are arranged in the Z-axis positive direction relative to the plate protrusion 530 .

As described above, according to the power storage device 10 according to the present modification, the same effects as those of the above-described embodiment can be obtained. In power storage device 10, when insulating projecting portion 620 of insulating member 600 is attached to plate projecting portion 520 of side plate 500, the amount of protrusion of the other insulating projecting portion needs to be increased in order to ensure clearance. There is If the protruding amount of the other insulating protruding portion is long, there is a possibility that space saving (miniaturization) cannot be achieved. Therefore, in the insulating projecting portions 630a and 630b, second portions 632a and 632b that bend in the Z-axis direction (second direction) from the first portion 631 projecting from the insulating body portion 610 in the X-axis direction (first direction) are provided. Further, the tip portions 633b and 633c connected to the second portions 632a and 632b do not protrude further from the plate protruding portion 530 in the Z-axis direction (second direction) away from the storage element 100 (Z-axis negative direction). place in position. As a result, it is possible to suppress the amount of protrusion of the insulating projecting portions 630a and 630b in the X-axis direction (first direction) from becoming longer, and the insulating projecting portions 630a and 630b can store electricity even in the Z-axis direction (second direction). Protrusion in a direction away from the element 100 can be suppressed. Therefore, space saving (downsizing) of the power storage device 10 can be achieved.

By arranging the tips 633b and 633c of the insulating protrusions 630a and 630b at positions that do not protrude from the plate protrusion 530, it is possible to prevent the insulating protrusions 630a and 630b from interfering with other members and causing damage such as breakage. can. If the insulating protrusions 630a and 630b can be prevented from being damaged, it is not necessary to form the insulating protrusions 630a and 630b thick so as not to damage the insulating protrusions 630a and 630b. Space saving (miniaturization) of the power storage device 10 can also be achieved by this.

In the insulating protruding portion 630a of the insulating member 600, the second portion 632a is bent toward the power storage element 100 (the Z-axis positive direction), so that the insulating protruding portion 630a extends toward the power storage element 100 in the Z-axis direction (second direction). can be suppressed from protruding in the direction away from the Thereby, space saving (miniaturization) of the power storage device 10 can be achieved. By bending the second portion 632a toward the power storage element 100 (Z-axis positive direction), the fixing member 700 is more insulated than when the second portion 632b is bent away from the power storage element 100 (Z-axis negative direction). This makes it easier to insert the projecting portion 630a.

In the above modified example, the distal end portion 633b or 633c may be arranged at the same position as the plate protrusion 530 in the Z-axis direction, for example, by being placed in the X-axis minus direction of the plate protrusion 530 . Also with this, the tip portion 633b or 633c is arranged at a position that does not protrude further in the negative Z-axis direction than the plate protruding portion 530, so that the same effect as described above can be obtained.

(Modification 2)
Modification 2 of the above embodiment will be described. 7A and 7B are cross-sectional views showing a configuration in which an insulating member 600 according to Modification 2 of the present embodiment is arranged on a side plate 500. FIG. 7A and 7B are diagrams corresponding to FIGS. 6A and 6B.

As shown in FIGS. 7A and 7B, in this modified example, the fixing member 700 in the first modified example is not arranged. Since the rest of the configuration of this modification is the same as that of Modification 1, detailed description thereof will be omitted. That is, in this modified example, as in the first modified example, the insulating projecting portions 630a and 630b are provided with second portions 632a and 632b that bend in the Z-axis direction from the first portion 631, and the tip portions 633b and 633c are provided with plates. It is arranged at a position where it does not protrude further in the Z-axis negative direction than the projecting portion 530 .

As described above, according to the power storage device 10 according to this modified example, the same effects as those of the first modified example can be obtained.

(Modification 3)
Modification 3 of the above embodiment will be described. 8A and 8B are cross-sectional views showing a configuration in which insulating member 600 according to Modification 3 of the present embodiment is fixed to side plate 500 with fixing member 701. FIG. 8A is a diagram corresponding to (c) of FIG. 5, and FIG. 8B is a diagram corresponding to FIG. 6A.

As shown in FIGS. 8A and 8B, in this modification, the insulating member 600 is fixed to the side plate 500 with a fixing member 701 instead of the fixing member 700 in the first embodiment and the first modification. Other configurations of this modified example are the same as those of the above-described embodiment, so detailed description thereof will be omitted.

As shown in FIG. 8A, the securing member 701 is a fastener that secures the insulating protrusion 630 to the plate protrusion 530 . Specifically, the fixing member 701 has a shaft portion 702 that protrudes and extends in the Z-axis negative direction, and the shaft portion 702 is connected to the first portion 631 and the tip portion 633 of the insulating protrusion portion 630 and the plate protrusion portion 530 . and fix the insulating protrusion 630 to the plate protrusion 530 . The fixing members 701 are arranged at both ends of the insulating protrusion 630 and the plate protrusion 530 in the Y-axis direction to fix the insulating protrusion 630 to the plate protrusion 530. The arrangement position and the number of the fixing members 701 are particularly Not limited.

Similarly for FIG. 8B, the fixing member 701 has a shaft portion 702, and the shaft portion 702 penetrates the first portion 631 and the tip portion 633b of the insulating protrusion 630a and the plate protrusion 530, and the insulating protrusion Section 630 a is secured to plate protrusion 530 . In the fixing member 701, the shaft portion 702 passes through the first portion 631 and the tip portion 633c of the insulating protrusion 630b shown in FIG. may

As described above, according to power storage device 10 according to the present modification, the same effects as those of the above-described embodiment or modification 1 can be achieved. The shape of the fixing member 701 can take various shapes other than those shown in this modified example.

(Other modifications)
In the above embodiment, the insulating protrusion 630 of the insulating member 600 may not have the tip portion 633 or the second portion 632 and the tip portion 633 . As a result, it is possible to prevent the insulating projecting portion 630 from projecting further in the Z-axis negative direction than the plate projecting portion 530, so that the same effects as those of the first modification can be obtained. Similarly, the insulating projecting portion 620 may not have the tip portion 623 or the second portion 622 and the tip portion 623 .

In the above embodiment, the insulating member 600 has a pair of insulating protrusions 620 and 630, but the insulating protrusion 620 may not be provided. Similarly, side plate 500 may not have plate protrusion 520 .

In the above embodiment, the tip portion 623 of the insulating projecting portion 620 of the insulating member 600 has the convex portion 623a, but the convex portion 623a may not be provided. Similarly, the tip portion 633 of the insulating projecting portion 630 does not have to have the convex portion 633a.

In the above embodiment, the fixing member 700 fixes the insulating projecting portion 630 of the insulating member 600 to the plate projecting portion 530 of the side plate 500, but the insulating projecting portion 620 may be fixed to the plate projecting portion 520. good.

In the above embodiment, the side plate 500 is a member that connects the pair of end plates 400, but any member that is arranged on the side of the storage element 100 may be used, and its configuration is not particularly limited.

In the above embodiment, both the configuration in the positive direction of the X-axis and the configuration in the negative direction of the X-axis in power storage device 10 have the above-described configuration, but either one has a configuration different from the above-described configuration. may be

Forms constructed by arbitrarily combining the constituent elements included in the above embodiments and modifications thereof are also included within the scope of the present invention. That is, among the various modifications that can be applied to the above embodiment, those that can be applied to Modifications 1 to 3 may also be applied to Modifications 1 to 3. Of the modifications of any one of Modifications 1 to 3, those that can be applied to other modifications may also be applied to the other modifications.

The present invention can be realized not only as power storage device 10 as described above, but also as a combination of side plate 500, insulating member 600, and fixing member, a combination of insulating member 600 and fixing member, a fixing member, side plate 500, and insulating member 600. or as an insulating member 600.

INDUSTRIAL APPLICABILITY The present invention can be applied to a power storage device having a power storage element such as a lithium ion secondary battery.

10 power storage device 100 power storage element 110 container 140 electrode terminal 200 spacer 400 end plate 500 side plate 510 plate main body 520, 530 plate protrusion 600 insulating member 610 insulating main body 620, 630, 630a, 630b insulating protrusion 621, 631 Part 622, 632, 632a, 632b Second part 623, 633, 633b, 633c Tip part 623a, 633a Convex part 700, 701 Fixing member 702 Shaft part 710 First wall part 720 Connecting part 730 Second wall part

Claims (7)

A power storage device comprising: a power storage element; a side plate arranged to the side of the power storage element in a first direction; and an insulating member arranged between the power storage element and the side plate,
The side plate is
a plate body facing the storage element in the first direction;
a plate projecting portion projecting from the plate main body portion in the first direction and facing the power storage element in a second direction intersecting the first direction;
The insulating member is
an insulating main body portion disposed between the power storage element and the plate main body portion;
an insulating protrusion that protrudes from the insulating main body in the first direction and is arranged between the storage element and the plate protrusion in the second direction;
The power storage device includes a fixing member that fixes the insulating projecting portion to the plate projecting portion. The power storage device according to claim 1, wherein the fixing member fixes the insulating projecting portion to the plate projecting portion by sandwiching the insulating projecting portion and the plate projecting portion in the second direction. The electricity storage according to claim 1 or 2, wherein the insulating projecting portion has a first portion projecting from the insulating body portion in the first direction and a second portion bending from the first portion in the second direction. Device. The power storage device according to claim 3, wherein the second portion is bent in a direction toward the power storage element in the second direction from the first portion. The insulating protrusion further has a tip connected to the second part,
The power storage device according to claim 3 or 4, wherein the tip portion is arranged at a position that does not protrude in the second direction away from the power storage element more than the plate projecting portion. The power storage device according to any one of claims 1 to 4, wherein the insulating protrusions are arranged so as to sandwich the plate protrusions in the second direction. A power storage device comprising: a power storage element; a side plate arranged to the side of the power storage element in a first direction; and an insulating member arranged between the power storage element and the side plate,
The side plate is
a plate body facing the storage element in the first direction;
a pair of plate protrusions that protrude from the plate body in the first direction and face the storage elements on both sides in a second direction that intersects the first direction;
The insulating member is
an insulating main body portion disposed between the power storage element and the plate main body portion;
a pair of insulating projections projecting from the insulating main body in the first direction and arranged between the storage element and the pair of plate projections in the second direction;
one of the pair of insulating protrusions attached to one of the pair of plate protrusions;
The other of the pair of insulating projecting portions is connected to the first portion projecting from the insulating body portion in the first direction, the second portion bending from the first portion in the second direction, and the second portion. and a tip that
The power storage device is such that the tip portion is arranged at a position that does not protrude further in the second direction than the plate projecting portion in a direction away from the power storage element.

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