JP7366523B2 - Power storage device - Google Patents

Description

The present invention relates to a power storage device including a power storage element, an insulating member placed on the side of the power storage element, and a conductive member placed at a position sandwiching the insulating member between the power storage element and the power storage element.

Conventionally, power storage devices are widely known that include a power storage element, an insulating member disposed on the side of the power storage element, and a conductive member arranged at a position sandwiching the insulating member between the power storage element and the power storage element. For example, Patent Document 1 describes a power storage element (battery cell), an insulating member (packing) disposed on the side of the power storage element, and a conductive member (side plate) disposed at a position sandwiching the insulating member between the power storage element and the power storage element. ) A power storage device (battery system) is disclosed.

International Publication No. 2015/145927

However, the above conventional power storage device has a problem in that the power storage element and the conductive member may not be sufficiently insulated. In other words, in Patent Document 1, an insulating member is arranged across a plurality of power storage elements to insulate the power storage elements and the conductive member, but for example, in the power storage element at the end, the conductive member The creepage distance is relatively short, and it may not be possible to sufficiently insulate the conductive member from the conductive member.

The present invention was made in order to solve the above problem, and an object of the present invention is to provide a power storage device that can improve the insulation between a power storage element and a conductive member.

In order to achieve the above object, a power storage device according to one aspect of the present invention includes a power storage element, an insulating member disposed on the first direction side of the power storage element, and a position where the insulating member is sandwiched between the power storage element and the power storage element. and a conductive member disposed in the second direction, the power storage element having an electrode terminal disposed in a second direction intersecting the first direction, and the conductive member having an outer edge in the second direction. It has a concave recess.

According to this, in the power storage device, the power storage element has an electrode terminal on the second direction side, and the conductive member disposed at a position sandwiching the insulating member from the power storage element has an outer edge on the second direction side. It has a recessed part. Here, in a power storage element, current flows through the electrode terminals, so in order to ensure insulation between the power storage element and the conductive member, the insulation between the electrode terminal of the power storage element and the conductive member must be It is important to ensure that For this reason, a concave portion having a concave outer edge on the second direction side (electrode terminal side) is formed in the conductive member. Thereby, the creeping distance between the electrode terminal of the power storage element and the conductive member can be increased, so that the insulation between the power storage element and the conductive member can be improved.

Further, the recessed portion may be a recessed portion in which an outer edge of the conductive member on the second direction side is recessed relative to the insulating member.

According to this, the recess of the conductive member is a recess formed such that the outer edge of the conductive member on the second direction side is recessed relative to the insulating member. In this way, by making the recess of the conductive member deeper than the insulating member, the creepage distance between the electrode terminal of the power storage element and the conductive member can be increased, so that the distance between the power storage element and the conductive member can be increased. It is possible to improve the insulation between the two.

Further, the recessed portion may have a curved outer edge shape.

According to this, the recessed portion of the conductive member has a curved outer edge shape. In this way, even when a recess is formed in the conductive member in order to increase the creepage distance between the electrode terminal of the power storage element and the conductive member, by making the outer edge of the recess curved, local stress can be reduced in the recess. It is possible to suppress damage to the conductive member due to contact with the conductive member.

Further, the insulating member may include a rib disposed within the recess.

According to this, the insulating member has a rib disposed within the recess of the conductive member. In this way, by arranging the rib of the insulating member within the concave portion of the conductive member, the creepage distance between the electrode terminal of the power storage element and the conductive member can be further increased. It is possible to further improve the insulation between the two.

Furthermore, the battery may further include a side member disposed on a side of the power storage element, and the recessed portion may be disposed on the first direction side of the side member.

According to this, the recessed portion of the conductive member is arranged on the first direction side of the side member arranged on the side of the power storage element. In this way, in the conductive member, by forming the recess at the first direction side of the side member, it is possible to suppress the strength of the conductive member on the first direction side of the power storage element from decreasing. Thereby, it is possible to improve the insulation between the power storage element and the conductive member while suppressing a decrease in the strength of the conductive member.

Further, in the side member, the radius of curvature of the outer edge of the first corner on the side of the electricity storage element is larger than that of the second corner on the side opposite to the electricity storage element, and the recess is formed in the side member. The outer edge may have a larger radius of curvature than the first corner.

According to this, in the side member, the radius of curvature of the outer edge is formed larger at the first corner on the side of the electricity storage element than at the second corner on the opposite side to the electricity storage element, and The concave portion has an outer edge having a radius of curvature larger than that of the first corner. In this way, since the side member has a large radius of curvature of the outer edge of the first corner closer to the power storage element, the creepage distance between the power storage element and the side member can be increased. Thereby, even if the side member and the conductive member are electrically connected, it is possible to improve the insulation between the power storage element and the conductive member. Further, since the first corner of the side member has an outer edge whose radius of curvature is not larger than that of the recess of the conductive member, there is a gap between the first corner and the second corner of the side member. A straight line portion of a certain length is formed. Thereby, the conductive member can be opposed to the linear portion of the side member, so the conductive member can be easily positioned with respect to the side member.

Note that the present invention can be realized not only as such a power storage device, but also as a conductive member or an insulating member included in the power storage device.

According to the power storage device of the present invention, it is possible to improve the insulation between the power storage element and the conductive member.

FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. FIG. 1 is a perspective view showing the configuration of a power storage element according to an embodiment. FIG. 1 is a perspective view and a sectional view showing the configuration of a spacer (intermediate spacer) according to an embodiment. FIG. 1 is a perspective view and a sectional view showing the configuration of a spacer (end spacer) according to an embodiment. FIG. 1 is a perspective view and a plan view showing the configuration of an insulator according to an embodiment. It is a perspective view showing the composition of the side plate concerning an embodiment. FIG. 2 is a plan view and a cross-sectional view showing the positional relationship of a power storage element, a spacer, an end member, an insulator, and a side plate according to an embodiment. FIG. 2 is a perspective view showing the positional relationship among a power storage element, a spacer, an end member, an insulator, and a side plate according to an embodiment. FIG. 2 is a cross-sectional view showing the positional relationship between a power storage element, a spacer, an insulator, and a side plate according to an embodiment.

Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Note that the embodiments described below are comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, manufacturing steps, order of manufacturing steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the most significant concept will be described as arbitrary constituent elements. Further, in each figure, dimensions etc. are not strictly illustrated.

In addition, in the following description and drawings, the direction in which a pair of electrode terminals in one power storage element are arranged, the direction in which a pair of short sides face each other in a container of one power storage element, the direction in which insulators are arranged, the direction in which side plates are arranged, , the direction in which the insulator and side plate are lined up is defined as the X-axis direction. In addition, the direction in which power storage elements are arranged, the direction in which spacers (intermediate spacers, end spacers) are arranged, the direction in which end members are arranged, the direction in which power storage elements, spacers, and end members are arranged, and the direction in which a pair of long sides of a container for one power storage element are The opposing direction or the thickness direction of the electricity storage element, spacer, or end member is defined as the Y-axis direction. Further, the direction in which the container body and the lid of the power storage element are lined up, the direction in which the power storage element, the bus bar, and the bus bar holding member are lined up, 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 intersect with each other (orthogonal in this embodiment). Note that depending on the mode of use, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below. Furthermore, in the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the opposite direction to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction.

Note that the X-axis direction is an example of the first direction, and the Z-axis plus direction is an example of the second direction. That is, the first direction is the direction in which the insulator is arranged with respect to the power storage element, and is the X-axis positive direction or the X-axis negative direction. Further, the second direction intersects the first direction and is a direction in which the electrode terminals of the electricity storage element are arranged.

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

The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 10 is a battery module (battery assembly) used for power storage, power supply, and the like. Specifically, the power storage device 10 can be used, for example, in a vehicle such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, or a construction machine. It is used as a battery for driving moving objects such as machines or for starting engines.

As shown in FIGS. 1 and 2, power storage device 10 includes a plurality of (12 in this embodiment) power storage elements 100, a plurality of spacers 200 and 300 (11 spacers 200 in this embodiment, and a pair of spacer 300), a pair of end members 400, a pair of insulators 600, a pair of side plates 700, a bus bar 800, and a bus bar holding member 900. Further, a joining member 510 is arranged between the power storage element 100 and the spacer 200, a joining member 520 is arranged between the power storage element 100 and the spacer 300, and a joining member 520 is arranged between the spacer 300 and the end member 400. A member 530 is arranged. Further, a pair of external terminals 810 (a positive external terminal and a negative external terminal), which are terminals of the power storage device 10, are connected to the bus bar 800. Note that the power storage device 10 also includes wiring for measuring the voltage of the power storage element 100, wiring for measuring the temperature, a thermistor, etc., but illustrations of these are omitted and detailed description thereof is also omitted. Furthermore, power storage device 10 may also include electrical equipment such as a circuit board and a relay for monitoring the charging state and discharging state of power storage element 100.

The power storage element 100 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular parallelepiped (prismatic) shape, and is arranged adjacent to the spacers 200 and 300. That is, each of the plurality of power storage elements 100 is arranged alternately with each of the plurality of spacers 200 and 300, and arranged in the Y-axis direction. In this embodiment, 11 spacers 200 are arranged between adjacent power storage elements 100 among 12 power storage elements 100, and the power storage elements 100 at the ends of the 12 power storage elements 100 are A pair of spacers 300 are arranged at sandwiching positions.

Note that the number of power storage elements 100 is not limited to 12, and may be a number other than 12. Further, the shape of the power storage element 100 is not limited to a rectangular parallelepiped shape, and may be a polygonal column shape other than a rectangular parallelepiped shape, or may be a laminated type power storage element. Furthermore, the power 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 a capacitor. Moreover, the power storage element 100 may be a primary battery that can use the stored electricity without being charged by the user, instead of being a secondary battery. Furthermore, power storage element 100 may be a battery using a solid electrolyte. A detailed explanation of the configuration of this power storage element 100 will be described later.

Spacers 200 and 300 are rectangular and plate-shaped spacers that are arranged on the sides of power storage element 100 (in the Y-axis positive direction or Y-axis negative direction) and insulate power storage element 100 from other members. Specifically, spacer 200 is an intermediate spacer that is disposed between two adjacent power storage elements 100 and insulates between the two power storage elements 100. More specifically, joining members 510 are arranged on both sides of the spacer 200 in the Y-axis direction, and the joining members 510 join the spacer 200 and the power storage elements 100 on both sides in the Y-axis direction. Note that in this embodiment, 11 spacers 200 are arranged corresponding to 12 power storage elements 100, but if the number of power storage elements 100 is other than 12, the number of spacers 200 also depends on the power storage It is changed depending on the number of elements 100.

Spacer 300 is an end spacer that is disposed between power storage element 100 at the end and end member 400 and insulates between power storage element 100 at the end and end member 400. Specifically, a joining member 520 is arranged on the side of the power storage element 100 of the spacer 300, and the spacer 300 and the power storage element 100 are joined by the joining member 520. Further, a joining member 530 is arranged on the end member 400 side of the spacer 300, and the spacer 300 and the end member 400 are joined by the joining member 530. A detailed explanation of the configuration of these spacers 200 and 300 will be given later.

The end member 400 and the side plate 700 are members that press the power storage elements 100 from the outside in the direction in which the plurality of power storage elements 100 are lined up (Y-axis direction). That is, the end member 400 and the side plate 700 sandwich the plurality of power storage elements 100 from both sides in the arrangement direction, thereby pressing each power storage element 100 included in the plurality of power storage elements 100 from both sides in the arrangement direction.

Specifically, the end members 400 are disposed on both sides of the plurality of power storage elements 100 in the Y-axis direction, and sandwich the plurality of power storage elements 100 from both sides in the direction in which the plurality of power storage elements 100 are lined up (Y-axis direction). It is a flat block-shaped end plate (holding member) that holds the device. The end member 400 is made of a metal (conductive) member such as steel or stainless steel, for example, from the viewpoint of strength. Note that the material of the end member 400 is not particularly limited, and may be made of, for example, a high-strength insulating member, or may be subjected to an insulation treatment. End member 400 is an example of a side member disposed on the side of power storage element 100.

The side plate 700 is an elongated and flat plate-shaped restraint member (restraint bar) whose both ends are attached to the end member 400 and which restrains the plurality of power storage elements 100 . In other words, the side plate 700 is arranged to extend in the Y-axis direction so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200, 300, and to apply a restraining force in the direction in which these are lined up (Y-axis direction). In this embodiment, two side plates 700 are provided on both sides of the plurality of power storage elements 100 in the X-axis direction, at positions where the insulator 600 is sandwiched between the power storage elements 100 (specifically, the second container surface 111a, which will be described later). is located. Each of the two side plates 700 is attached to the ends of the two end members 400 in the X-axis direction at both ends in the Y-axis direction. Thereby, the two side plates 700 sandwich and restrain the plurality of power storage elements 100 and the plurality of spacers 200 and 300 from both sides in the X-axis direction and both sides in the Y-axis direction.

Further, the side plate 700 is fixed to the end member 400 by a plurality of fixing members 701 arranged in the Z-axis direction. In this embodiment, fixing member 701 is a bolt that passes through side plate 700 and is joined to end member 400. Note that the attachment of the side plate 700 to the end member 400 is not limited to fixing with bolts, and may be joined by welding, adhesive, or the like. Further, like the end member 400, the side plate 700 is a conductive member formed of a metal (conductive) member such as steel or stainless steel from the viewpoint of strength, etc. It may be formed of a member or may be subjected to an insulation treatment. Side plate 700 is an example of an outer portion of a conductive member that sandwiches an insulating member with power storage element 100 or a pressing member that presses power storage element 100 . A detailed explanation of the configuration of this side plate 700 will be described later.

Insulator 600 is a long and flat insulating member that is arranged on both sides of the plurality of power storage elements 100 in the X-axis direction and extends in the Y-axis direction. That is, the insulator 600 is arranged between the plurality of power storage elements 100 and the plurality of spacers 200, 300 and the side plate 700 so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200, 300, and and the side plate 700 are insulated. The insulator 600 is made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyethylene terephthalate (PET), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl. Made of insulating materials such as vinyl ether (PFA), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyether sulfone (PES), ABS resin, ceramic, and composite materials thereof. . Note that the insulator 600 may be made of any material as long as it has insulation properties, and the two insulators 600 may be made of different materials.

The insulator 600 also has a function of pressing the plurality of power storage elements 100 in the negative Z-axis direction. In other words, the plurality of power storage elements 100 are configured to be cooled by being placed on the cooling device 20 (see FIG. 10), and the insulator 600 presses the plurality of power storage elements 100 toward the cooling device 20. . Cooling device 20 is a device that cools power storage device 10 (a plurality of power storage elements 100) by water cooling, for example. Note that the power storage device 10 is configured to be mounted, for example, on the body of a car in which the power storage device 10 is mounted, or on an exterior body that houses the power storage device 10, rather than on the cooling device 20, and the insulator 600 may be configured to press the plurality of power storage elements 100 toward the vehicle body, exterior body, or the like. The insulator 600 is a first insulating member disposed on the X-axis direction side of the power storage element 100, a contact member that abuts the power storage element 100, or an inner side located inside of a pressing member that presses the power storage element 100. This is an example of the section. A detailed explanation of the configuration of this insulator 600 will be described later.

Bus bar 800 is a conductive plate-like member that is disposed on a plurality of power storage elements 100 and electrically connects the electrode terminals of the plurality of power storage elements 100. In this embodiment, bus bar 800 connects the plurality of power storage elements 100 in series by sequentially connecting the positive and negative terminals of adjacent power storage elements 100. Furthermore, positive and negative external terminals 810 are connected to the bus bar 800 arranged at the end. The bus bar 800 is made of a conductive member made of metal, such as copper, copper alloy, aluminum, or aluminum alloy. Note that the connection form of the power storage elements 100 is not particularly limited, and any of the power storage elements 100 may be connected in parallel.

The busbar holding member 900 is a plate that can hold the busbar 800 and other wiring (not shown), insulate the busbar 800, etc. from other members, and regulate the position of the busbar 800, etc. It is a shaped member (busbar plate, busbar frame). Specifically, the busbar holding member 900 has a main body part and a lid part, and by opening the lid part and placing the bus bar 800 etc. on the main body part, and then closing the lid part, the bus bar The structure is such that it can accommodate 800 etc. The bus bar holding member 900 is made of an insulating material such as PC, PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, ABS resin, ceramic, and composite materials thereof.

[2 Detailed description of power storage element 100]
Next, the configuration of power storage element 100 will be described in detail. FIG. 3 is a perspective view showing the configuration of power storage element 100 according to this embodiment.

As shown in FIG. 3, the power storage element 100 includes a container 110, two electrode terminals 120 (a positive electrode terminal and a negative electrode terminal), two gaskets 121, and an insulating sheet 130. Further, inside the container 110, an electrode body, a current collector (a positive electrode current collector and a negative electrode current collector), an electrolytic solution (non-aqueous electrolyte), etc. are stored, but illustration of these is omitted. . Note that the type of electrolytic solution is not particularly limited as long as it does not impair the performance of power storage element 100, and various types can be selected. Further, a gasket is also arranged between the container 110 (lid 112 described later) and the current collector, and spacers are arranged on the sides of the current collector, but illustration of these is also omitted.

The container 110 is a rectangular parallelepiped (prismatic) container that includes a container body 111 with an opening formed therein and a lid 112 that closes the opening of the container body 111. The lid 112 is a rectangular plate-like member that constitutes the lid of the container 110, and is disposed on the positive Z-axis side of the container body 111. Here, the lid 112 has a container first surface 112a on which the electrode terminal 120 is arranged. The first surface 112a of the container is a rectangular plane (outer surface or upper surface) extending in the X-axis direction and disposed on the Z-axis plus direction side of the lid 112. The lid 112 also includes a gas exhaust valve 113 that releases the pressure when the pressure inside the container 110 increases, and a liquid injection part 114 that injects electrolyte into the inside of the container 110. It is provided.

The container main body 111 is a rectangular cylindrical member with a bottom that constitutes the main body of the container 110, and has two container second surfaces 111a on both side surfaces in the X-axis direction, and a container second surface 111a on the side in the negative Z-axis direction. It has three surfaces 111b, and two container fourth surfaces 111c on both side surfaces in the Y-axis direction. The second container surface 111a is a rectangular plane that forms the short side of the container 110. In other words, the second container surface 111a is adjacent to the first container surface 112a, the third container surface 111b, and the fourth container surface 111c, and has a smaller area than the fourth container surface 111c. Further, the third container surface 111b is a rectangular plane that forms the bottom surface of the container 110. In other words, the third container surface 111b is a surface that faces the first container surface 112a and is adjacent to the second container surface 111a and the fourth container surface 111c. The fourth container surface 111c is a rectangular plane that forms the long side of the container 110. In other words, the fourth container surface 111c is adjacent to the first container surface 112a, the second container surface 111a, and the third container surface 111b, and has a larger area than the second container surface 111a. The container body 111 has a curved container corner 111d at the boundary between the second container surface 111a and the fourth container surface 111c.

With such a configuration, the container 110 is configured such that after the electrode body and the like are housed inside the container body 111, the container body 111 and the lid 112 are joined by welding or the like to form a joint 115. The structure is such that it is sealed. That is, on the side surfaces of the container 110 (the surfaces on both sides in the X-axis direction and both sides in the Y-axis direction), joint parts 115 are formed where the container body 111 and the lid body 112 are joined to each other. The material of the container 110 (container body 111 and lid 112) is not particularly limited, but is preferably a weldable (joinable) metal such as stainless steel, aluminum, aluminum alloy, iron, or plated steel plate.

The electrode terminal 120 is a terminal (positive electrode terminal and negative electrode terminal) of the electricity storage element 100 arranged on the first surface 112a of the container 110, and is electrically connected to the positive electrode plate and the negative electrode plate of the electrode body via the current collector. It is connected to the. In other words, the electrode terminal 120 is a metal terminal for guiding electricity stored in the electrode body to the external space of the power storage element 100 and for introducing electricity into the internal space of the power storage element 100 in order to store electricity in the electrode body. It is a manufactured member. Note that the electrode terminal 120 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.

The gasket 121 is a member disposed around the electrode terminal 120 and between the electrode terminal 120 and the lid 112 of the container 110 to ensure insulation and airtightness between the electrode terminal 120 and the container 110. It is. The gasket 121 is made of an insulating material such as PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, or ABS resin.

Here, the electrode terminal 120 and the gasket 121 are convex portions that protrude from the first container surface 112a of the container 110. That is, the electrode terminal 120 or the gasket 121 is an example of a convex part that the power storage element 100 has, and the power storage element 100 has two such convex parts on both sides of the first surface 112a of the container in the X-axis direction. In this embodiment, power storage element 100 has gasket 121 as the convex portion.

The electrode body is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. Here, the positive electrode plate included in the electrode body has a positive electrode active material layer formed on a positive electrode base material layer which is a long strip-shaped current collecting foil made of metal such as aluminum or aluminum alloy. Further, the negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a long strip-shaped current collecting foil made of metal such as copper or copper alloy. Further, as the positive electrode active material used in the positive electrode active material layer and the negative electrode active material used in the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. Further, the current collector is a member (a positive electrode current collector and a negative electrode current collector) that is electrically connected to the electrode terminal 120 and the electrode body and has conductivity and rigidity. Note that the positive electrode current collector is formed of aluminum or an aluminum alloy, etc., like the positive electrode base material layer of the positive electrode plate, and the negative electrode current collector is formed of copper, copper alloy, etc., like the negative electrode base material layer of the negative electrode plate. has been done.

The insulating sheet 130 is an insulating sheet-like member that is placed on the outer surface of the container 110 and covers the outer surface of the container 110. The material of the insulating sheet 130 is not particularly limited as long as it can ensure the insulation required for the power storage element 100, but for example, insulating resin such as PC, PP, PE, PPS, PET, PBT, or ABS resin, Examples include epoxy resin, Kapton, Teflon (registered trademark), silicone, polyisoprene, and polyvinyl chloride.

Specifically, the insulating sheet 130 covers the entire surface of the third container surface 111b of the container 110, almost the entire surface of the second container surface 111a and the fourth container surface 111c, and a part of the first container surface 112a. It is a single insulating sheet placed on the In this way, the insulating sheet 130 is placed on the outer surface of the container 110 with the gas discharge valve 113, liquid injection part 114, and electrode terminal 120 of the lid 112 exposed. The insulating sheet 130 is an example of a second insulating member that covers the third surface 111b of the container.

[3 Detailed description of spacer 200]
Next, the configuration of the spacer 200 will be described in detail. FIG. 4 is a perspective view and a cross-sectional view showing the configuration of spacer 200 according to this embodiment. Specifically, FIG. 4A is an exploded perspective view of the spacer 200 showing each component along with the joining member 510. FIG. 4B is a cross-sectional view showing the configuration of the upper part (part on the Z-axis positive direction side) when the second member 210 of the spacer 200 in FIG. 4A is cut along the IVbc-IVbc line. FIG. 4(c) is a cross-sectional view showing the configuration of the lower part (part on the negative Z-axis direction side). Note that in FIGS. 4(b) and 4(c), components other than the second member 210 are also shown with broken lines for convenience of explanation.

As shown in FIG. 4, the spacer 200 includes a first member 201 and a second member 210. The first member 201 is a member disposed at a position in contact with the fourth surface 111c of the container, which is the side surface in the Y-axis direction of the power storage element 100, and includes the first plate portion 220, the second plate portion 230, and the second plate portion 230. It has a joining member 240 that joins the first plate part 220 and the second plate part 230. The second member 210 is a member that is disposed on the side of the first member 201 in the direction crossing the Y-axis direction and supports the end of the first member 201 in the direction crossing the Y-axis direction. Specifically, an opening 212 that is a rectangular through hole passing through in the Y-axis direction is formed at the center of the second member 210, and the first member 201 is arranged within the opening 212. Thus, the second member 210 is configured to support the periphery of the first member 201.

More specifically, as shown in FIG. 10 described below, the second member 210 includes a main body 211, a first protrusion 213, a second protrusion 214, and a third protrusion 215. . The main body portion 211 is a rectangular annular plate-shaped portion with the above-mentioned opening 212 formed in the center. Further, the main body portion 211 is provided with a spacer first surface 211a, a joint protrusion 211b, a first recess 211c, a sandwiching portion 211d, a second recess 211e, and a spacer second surface 211f. .

The spacer first surface 211a is an annular plane disposed on the Y-axis minus direction side of the main body portion 211 and around the opening 212, and the joining member 510 on the Y-axis minus direction side is disposed. That is, four rectangular joining members 510 are arranged on the spacer first surface 211a, and the spacer 200 and the power storage element 100 on the Y-axis negative direction side are joined. Further, the spacer second surface 211f is an annular plane disposed on the opposite side (Y-axis positive direction side) from the spacer first surface 211a and around the opening 212, and is an annular plane arranged around the joining member 512 on the Y-axis positive direction side. is placed. That is, four rectangular joining members 510 are arranged on the spacer second surface 211f, and the spacer 200 and the power storage element 100 on the Y-axis positive direction side are joined.

Here, bonding member 510 is a member that is disposed between power storage element 100 and spacer 200 and joins power storage element 100 and spacer 200, and in this embodiment, is an adhesive layer such as double-sided tape. Note that the joining member is not limited to double-sided tape, but may also be an adhesive layer such as an adhesive, and may be used for mechanical purposes such as caulking, fitting, etc. It may be a joined part or another joined part.

The joint protrusion 211b is a long protrusion in the X-axis direction that is arranged to protrude from the spacer first surface 211a and the spacer second surface 211f on both sides in the Y-axis direction, and connects the containers of the power storage elements 100 on both sides in the Y-axis direction. 110 and is disposed opposite to the joint portion 115 of 110 . Specifically, the joint protrusion 211b is arranged at a position where it comes into contact with the joint 115 of the container 110 of the power storage element 100 when the power storage element 100 is arranged adjacent to the spacer 200. That is, the joint protrusion 211b is in contact with the joint 115 when the power storage device 10 is manufactured, or when the container 110 of the power storage element 100 swells during use of the power storage device 10. come into contact with

The first recess 211c is an annular recess formed along the periphery of the opening 212 and recessed in the positive direction of the Y-axis. That is, the second member 210 has a first recess 211c at the end along the opening 212, and the first member 201 engages with this first recess 211c in the Y-axis direction. Specifically, the first recessed portion 211c engages with the engaging portion 221 disposed at the end of the first plate portion 220 of the first member 201, thereby causing the first member 201 to move relative to the second member 210. is placed. Note that the first member 201 may have a first recess, and the second member 210 may have an engaging portion that engages with the first recess. In other words, either the first member 201 or the second member 210 has a first recess at its end, and the other has an engaging part 221 that engages with the first recess in the Y-axis direction. Bye.

The pinching portion 211d is a protrusion that projects inward from the opening 212 from the inner wall of the first recess 211c, and has the function of pinching the first member 201. In this embodiment, a total of eight sandwiching portions 211d are provided on both sides of the first member 201 in the X-axis direction and on both sides of the Z-axis direction. That is, in the X-axis direction, the two pairs of sandwiching parts 211d sandwich the first member 201, and also in the Z-axis direction, the two pairs of sandwiching parts 211d sandwich the first member 201. Specifically, the pinching portions 211d sandwich the first member 201 in the X-axis direction and the Z-axis direction by engaging with end surfaces of the first member 201 on both sides in the X-axis direction and on both sides in the Z-axis direction. Note that the shape, number, and arrangement position of the sandwiching portions 211d are not limited to those described above.

The second recess 211e is a recess recessed in the Y-axis direction from the spacer first surface 211a and the spacer second surface 211f, and is arranged on the side of the first member 201 and extends along the periphery of the first member 201. It is formed into a long shape. Specifically, the second recess 211e is arranged at a position adjacent to the sandwiching part 211d on the spacer first surface 211a, and the second recess 211e is arranged at a position adjacent to the sandwiching section 211d on the spacer second surface 211f. It is arranged inside the recessed portion 211e (on the first member 201 side). Note that the shape, number, and arrangement position of the second recesses 211e are not limited to those described above. Further, instead of the second recess 211e, a through hole passing through the main body 211 in the Y-axis direction may be formed.

With such a configuration, the sandwiching portion 211d and the second recess 211e are arranged within the range from the spacer first surface 211a to the spacer second surface 211f in the Y-axis direction. In other words, the sandwiching portion 211d and the second recess 211e are formed without a shape protruding from the spacer first surface 211a in the Y-axis negative direction, and are formed without a shape protruding from the spacer second surface 211f in the Y-axis positive direction. It is formed without accompanying. In other words, the first spacer surface 211a and the second spacer surface 211f are recessed or formed on the same plane as the adjacent surface at a position overlapping the sandwiching portion 211d when viewed from the Y-axis direction. Similarly, the first spacer surface 211a and the second spacer surface 211f are recessed or formed on the same plane as the adjacent surface at a position overlapping with the second recess 211e when viewed from the Y-axis direction.

The first protrusion 213 is an elongated protrusion that protrudes from the end of the main body 211 on the Z-axis plus direction toward both sides in the Y-axis direction. In this embodiment, two pairs of first protrusions 213 are arranged side by side in the X-axis direction. The first protrusion 213 is arranged to face the protrusion of the power storage element 100 (in this embodiment, the gasket 121) in the X-axis direction, and to protrude along the protrusion. A detailed explanation regarding this will be given later.

The second protrusions 214 are protrusions that protrude to both sides in the X-axis direction from portions of the main body portion 211 on both sides in the X-axis direction and on the positive Z-axis side. Here, the second protrusion 214 is formed with a concavo-convex portion having at least one of a concave portion and a convex portion at an end in the X-axis direction. Specifically, the uneven portion has a convex portion 214a that protrudes in the positive direction of the Y-axis, and a concave portion 214b that is formed on the back side of the convex portion 214a and has a concave surface at the end of the second protrusion 214. (See Figure 8). A detailed explanation regarding this will be given later.

The third protrusion 215 is a protrusion that protrudes from the end of the main body 211 on the Z-axis minus direction toward the bottom surface of the power storage element 100 (the third surface 111b of the container) in the Z-axis minus direction. . The third protrusions 215 are arranged at both ends of the main body 211 in the X-axis direction and placed on the insulator 600. A detailed explanation regarding this will be given later.

Here, the second member 210 is formed of an insulating material such as PC, PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, ABS resin, and composite materials thereof. . The second member 210 may be made of any material as long as it has insulation properties, and all the second members 210 of the plurality of spacers 200 may be made of the same material. Alternatively, one of the second members 210 may be made of a different material.

The first member 201 is made of a member having higher heat resistance than the second member 210. Moreover, it is preferable that the first member 201 is formed of a member having higher hardness than the second member 210. Further, it is more preferable that the first member 201 is formed of a member having higher heat insulation properties than the second member 210. For example, as the first plate part 220 and the second plate part 230, which have high heat resistance and the like, which constitute the first member 201, mica plates (thermal The decomposition temperature is, for example, about 600°C to 800°C). The first plate part 220 and the second plate part 230 may be made of any material as long as it has high heat resistance, and the first plate part 220 and the second plate part 230 may be made of any material. They may be made of different materials. The material etc. of the joining member 240 are the same as the material etc. of the joining member 510, so a detailed explanation will be omitted.

Here, high heat resistance means that it is not easily affected even when exposed to high temperatures and can maintain its physical properties (or maintain its shape).For example, glass transition temperature, deflection temperature under load (heat resistance) deformation temperature) or high melting point. In addition, when comparing the glass transition temperature, deflection temperature under load (heat distortion temperature), and melting point of two members, if the values are reversed, the member with the higher melting point is defined as the member with higher heat resistance. . Moreover, "high hardness" means that it is hard and difficult to deform, for example, it means that the Vickers hardness is high. Furthermore, "high heat insulation" means that heat is difficult to conduct, for example, that thermal conductivity is low. Comparison of heat resistance, etc. (heat resistance, hardness, and heat insulation properties) can be determined by appropriately measuring by a known method.

In the above embodiment, the first plate part 220 and the second plate part 230 are all made of a material having high heat resistance, etc., but some may be made of a material having high heat resistance etc. You can also assume that it is. For example, the first plate part 220 and the second plate part 230 are made of a material having high heat resistance etc. due to a structure in which a material (paint etc.) having high heat resistance etc. is arranged (applied) on the surface of a resin base material. It does not matter if it is formed.

Specifically, the first plate part 220 and the second plate part 230 are arranged at a position where they come into contact with the container fourth surface 111c of the electricity storage element 100 when the electricity storage element 100 is arranged adjacent to the spacer 200. It is a rectangular and flat member. That is, the first plate portion 220 and the second plate portion 230 are in contact with the fourth surface 111c of the container at the time of manufacturing the power storage device 10, or the container 110 of the power storage element 100 swells during use of the power storage device 10. When the container comes up, it comes into contact with the fourth surface 111c of the container. Moreover, the first plate part 220 is formed to have a larger width in the X-axis direction and the Z-axis direction and a thicker thickness in the Y-axis direction than the second plate part 230.

More specifically, the first plate portion 220 protrudes from the spacer first surface 211a toward the energy storage element 100 on the negative side of the Y-axis, and faces the center portion of the energy storage element 100 on the negative side of the Y-axis. will be placed. Moreover, the second plate part 230 is arranged on the opposite side (Y-axis positive direction side) of the first plate part 220. In other words, the second plate portion 230 protrudes from the spacer second surface 211f toward the power storage element 100 on the Y-axis positive direction side, and is arranged to face the center of the power storage element 100 on the Y-axis positive direction side. . Note that the first plate portion 220 is arranged to protrude further in the Y-axis negative direction than the joint protrusion 211b on the Y-axis negative side, and the second plate portion 230 is arranged so as to protrude more than the joint protrusion 211b on the Y-axis positive direction side. It is recessed in the negative direction of the Y-axis. In this way, the first member 201 is formed to have a thickness that is approximately the same as or thicker than the main body portion 211 of the second member 210 .

Note that the first plate portion 220 is an example of a central protrusion, and this central protrusion (first plate portion 220) and the joining protrusion 211b on the Y-axis negative direction side are examples of the first protrusion. Further, the second plate portion 230 is also an example of a central protrusion, and this central protrusion (second plate portion 230) and the joining protrusion 211b on the Y-axis plus direction side are examples of the second protrusion. Therefore, the central protrusion preferably has higher heat resistance and hardness than the second member 210, and more preferably has higher heat insulation properties. In other words, the first protruding portion and the second protruding portion have a portion having higher heat resistance and higher hardness than the portion having the spacer first surface 211a and the spacer second surface 211f of the spacer 200. It is preferable to have a portion, and it is more preferable to have a portion with high heat insulation properties.

[4 Detailed description of spacer 300]
Next, the configuration of the spacer 300 will be explained in detail. FIG. 5 is a perspective view and a sectional view showing the configuration of a spacer 300 according to this embodiment. Specifically, FIG. 5A is a perspective view showing the spacer 300 on the Y-axis plus direction side in FIG. 2 together with the joining members 520 and 530. FIG. 5B is a cross-sectional view showing the configuration of the upper part (part on the Z-axis positive direction side) when the spacer 300 in FIG. 5A is cut along the Vbc-Vbc line. (c) is a cross-sectional view showing the configuration of the lower part (part on the negative side of the Z-axis). Note that in FIGS. 5(b) and 5(c), the joining members 520 and 530 are also shown with broken lines for convenience of explanation. Note that the spacer 300 on the Y-axis minus direction side in FIG. 2 also has a similar configuration.

As shown in FIG. 5, the spacer 300 includes a main body 310, a first protrusion 320, a second protrusion 330, and a third protrusion 340. The main body portion 310 is a rectangular and plate-shaped portion, and is provided with a spacer first surface 311, a first protrusion 312 having a central protrusion 312a and a joining protrusion 312b, and a spacer second surface 313. There is. Note that the spacer 300 is made of the same material as the second member 210 of the spacer 200.

The spacer first surface 311 is an annular plane disposed on the Y-axis minus direction side of the main body portion 310 and around the central protrusion 312a, and the joining member 520 is disposed thereon. That is, four rectangular joining members 520 are arranged on the spacer first surface 311, and the spacer 300 and the power storage element 100 on the Y-axis negative direction side are joined. Further, the spacer second surface 313 is a rectangular plane disposed on the opposite side (Y-axis positive direction side) of the central protrusion 312a, and the joining member 530 is disposed thereon. That is, the rectangular joining member 530 is arranged on the spacer second surface 313, and the spacer 200 and the power storage element 100 on the positive side of the Y-axis are joined.

Here, the joining member 520 is a member that is arranged between the power storage element 100 and the spacer 300 and joins the power storage element 100 and the spacer 300, and the joining member 530 is arranged between the end member 400 and the spacer 300, This is a member that joins the end member 400 and the spacer 300. Since the materials of the joining members 520 and 530 are the same as those of the joining member 510, detailed description thereof will be omitted.

The center protrusion 312a of the first protrusion 312 protrudes from the spacer first surface 311 toward the power storage element 100 on the negative side of the Y-axis, and faces the center of the power storage element 100 on the negative side of the Y-axis. This is the part where it is placed. Further, the joint protrusion 312b is a long protrusion in the X-axis direction that is arranged to protrude from the first surface 311 of the spacer in the Y-axis negative direction, and is a long protrusion in the X-axis direction of the container 110 of the power storage element 100 on the Y-axis negative direction. It is arranged opposite to the joint part 115. Specifically, the central protrusion 312a and the joint protrusion 312b correspond to the fourth container surface 111c of the container 110 of the power storage element 100 and the joint part 115 when the power storage element 100 is arranged adjacent to the spacer 300. placed in contact with each other. That is, the central protrusion 312a and the joint protrusion 312b are in contact with the container fourth surface 111c and the joint 115 at the time of manufacturing the power storage device 10, or the container 112 of the power storage element 100 is in contact with the container 111c during the use of the power storage device 10. When it swells, it comes into contact with the fourth surface 111c of the container and the joint 115. Note that the joint protrusion 312b protrudes in the negative Y-axis direction to the same position as the central protrusion 312a.

The first protrusion 320 is an elongated protrusion that protrudes from the end of the main body 310 on the Z-axis plus direction toward the Y-axis minus direction. Note that since the first protrusion 320 has the same configuration as the first protrusion 213 of the spacer 200, detailed explanation will be omitted.

The second protrusions 330 are protrusions that protrude to both sides in the X-axis direction from portions of the main body portion 310 on both sides in the X-axis direction and on the positive Z-axis side. Here, the second protrusion 330 is formed with a concavo-convex portion having at least one of a concave portion and a convex portion at an end in the X-axis direction. Specifically, the uneven portion has recesses 331 and 332 in which the surface of the end of the second protrusion 330 is recessed (see FIG. 8). A detailed explanation regarding this will be given later.

The third protrusion 340 is a protrusion that protrudes from the end of the main body 310 in the Z-axis negative direction toward the bottom surface of the power storage element 100 (container third surface 111b). . Note that the third protrusion 340 has the same configuration as the third protrusion 215 of the spacer 200, so a detailed explanation will be omitted.

[5 Detailed description of insulator 600]
Next, the configuration of insulator 600 will be described in detail. FIG. 6 is a perspective view and a plan view showing the configuration of an insulator 600 according to this embodiment. Specifically, FIG. 6(a) is a perspective view showing the insulator 600 on the X-axis positive direction side in FIG. 2, and FIG. 6(b) is a perspective view of the insulator 600 in FIG. FIG. 3 is a perspective view showing the configuration when viewed from above. Further, FIG. 6(c) is an enlarged perspective view showing an enlarged portion surrounded by a broken line in FIG. 6(a). FIG. 6(d) is an enlarged view of the configuration of the end portion of the insulator 600 in FIG. 6(b) on the Y-axis negative direction side and the Z-axis positive direction side when viewed from the X-axis negative direction side. FIG. Note that the insulator 600 on the X-axis minus direction side in FIG. 2 also has a similar configuration.

As shown in FIG. 6, the insulator 600 includes an insulator main body 610, a first insulator wall 620, and a second insulator wall 630. Insulator main body portion 610 is a rectangular and plate-shaped portion that is disposed on the positive side of the X-axis of power storage element 100 and extends in the Y-axis direction, parallel to the YZ plane. The insulator first wall portion 620 is a long, plate-shaped portion that protrudes from the end of the insulator main body portion 610 on the Z-axis positive direction side in the X-axis negative direction side and extends in the Y-axis direction. , are arranged on the Z-axis positive direction side of the power storage element 100. The insulator second wall portion 630 is an elongated and plate-shaped portion that protrudes from the end of the insulator main body portion 610 on the Z-axis negative direction side in the X-axis negative direction side and extends in the Y-axis direction. , are arranged on the Z-axis negative direction side of the power storage element 100.

Specifically, the insulator main body portion 610 has a facing portion 611 and an extending portion 612. The opposing portion 611 is disposed on the X-axis direction side of the container second surface 111a facing the container second surface 111a of the power storage element 100, and has a rectangular and plate-like shape parallel to the YZ plane extending in the Y-axis direction. This is the part of the body. The extending portion 612 extends from a portion of the opposing portion 611 on the electrode terminal 120 side (Z-axis positive direction side) to a portion of the opposing portion 611 on the side opposite to the electrode terminal 120 (Z-axis negative direction side). This is a part that is arranged to extend in the direction. That is, the insulator main body portion 610 has a shape in which portions of the ends on both sides in the Y-axis direction on the Z-axis plus direction side protrude to both sides in the Y-axis direction.

Further, the extending portion 612 has a recess 613 and a rib 614. The recess 613 is a notch-shaped recess in which the outer edge of the extended portion 612 on the Z-axis plus direction side is recessed in the Z-axis minus direction. The rib 614 is a protrusion that protrudes from the surface of the extension 612 and is arranged to surround the recess 613. Specifically, the rib 614 includes a first rib 614a extending in the Z-axis direction and a second rib 614b extending in the Y-axis direction along the periphery of the recess 613. Note that in this embodiment, the ribs 614 protrude outward from the outer surface of the extending portion 612, but may protrude inward from the inner surface of the extending portion 612.

Further, a third rib 615 is provided on the inner surface of the insulator main body portion 610. The third rib 615 is a protrusion that protrudes inward from the inner surface of the end of the opposing portion 611 on the Z-axis plus direction side, and is arranged to extend in the Z-axis direction. In this embodiment, a plurality (11) of third ribs 615 are arranged at equal intervals in the Y-axis direction.

The insulator first wall part 620 has a first pressing part 621 and a second pressing part 622, which are a plurality of pressing parts. The plurality of pressing parts (first pressing part 621 and second pressing part 622) are arranged corresponding to each of the plurality of power storage elements 100, and are parts that press each of the plurality of power storage elements 100, and in detail, This is a convex portion that protrudes toward the corresponding power storage element 100. Specifically, the insulator first wall portion 620 has at least two first pressing portions 621 and a second pressing portion 622 as the plurality of pressing portions. In the present embodiment, two first pressing parts 621 are arranged corresponding to the electricity storage elements 100 at both ends of the plurality of electricity storage elements 100, and a plurality of ( 10 second pressing portions 622 are arranged.

Specifically, the first pressing portion 621 and the second pressing portion 622 are convex portions in which the surface of the first wall portion 620 of the insulator on the Z-axis positive direction is recessed, and the surface on the Z-axis negative direction is bulged. and are arranged at equal intervals in the Y-axis direction (alternating with the third ribs 615). Here, the first pressing part 621 is formed so that the protruding height of the convex part is higher than that of the second pressing part 622. That is, the protruding height H1 of the first pressing part 621 is formed to be larger than the protruding height H2 of the second pressing part 622 (see (d) in FIG. 6). Thereby, the first pressing section 621 presses the corresponding power storage element 100 with a larger force than the second pressing section 622. Note that a configuration may be adopted in which the first pressing portion 621 contacts the corresponding power storage element 100 and the second pressing portion 622 does not contact the corresponding power storage element 100.

Insulator second wall portion 630 is a portion on which power storage element 100 and spacers 200 and 300 are placed. A detailed explanation regarding this will be given later.

[6 Detailed description of side plate 700]
Next, the configuration of the side plate 700 will be described in detail. FIG. 7 is a perspective view showing the configuration of a side plate 700 according to this embodiment. Specifically, FIG. 7(a) is a perspective view showing the side plate 700 on the X-axis positive direction side in FIG. 2, and FIG. 7(b) is a perspective view of the side plate 700 in FIG. 7(a). FIG. 3 is a perspective view showing the configuration when viewed from the back side. Note that the side plate 700 on the X-axis minus direction side in FIG. 2 also has a similar configuration.

As shown in FIG. 7, the side plate 700 includes a side plate main body 710, a first side plate wall 720, a second side plate wall 730, and a third side plate wall 740.

The side plate main body part 710 is a rectangular and plate-shaped part that is arranged on the X-axis plus direction side of the insulator main body part 610 and extends in the Y-axis direction and parallel to the YZ plane. The side plate first wall portion 720 is an elongated and plate-shaped portion that protrudes in the negative X-axis direction from both ends of the side plate main body portion 710 in the Y-axis direction and extends in the Z-axis direction. and is fixed to the end member 400. The side plate second wall portion 730 is an elongated and plate-shaped portion that protrudes from the end of the side plate main body portion 710 on the Z-axis positive direction side in the X-axis negative direction side and extends in the Y-axis direction. and is inserted and arranged in the insulator first wall portion 620 (see (b) of FIG. 10). The side plate third wall portion 740 is an elongated and plate-shaped portion that projects in the X-axis negative direction from the end of the side plate main body 710 on the Z-axis negative direction and extends in the Y-axis direction. and is inserted and arranged in the insulator second wall portion 630 (see (c) of FIG. 10).

Here, the side plate main body portion 710 has a recessed portion 711 having a recessed outer edge on the Z-axis positive direction side and a recessed portion 712 having a recessed outer edge on the Z-axis negative direction side at both ends in the Y-axis direction. . In other words, the recess 711 is a notch-like recess in which the outer edge of the side plate main body 710 on the Z-axis plus direction side is recessed in the Z-axis minus direction, and has a curved outer edge shape. The recess 712 is a notch-like recess in which the outer edge of the side plate main body 710 on the Z-axis minus direction is recessed in the Z-axis plus direction, and has a curved outer edge shape.

[7 Explanation of positional relationship of each component]
Next, the positional relationship among power storage element 100, spacers 200 and 300, end member 400, insulator 600, and side plate 700 will be described in detail. FIG. 8 is a plan view and a cross-sectional view showing the positional relationship among power storage element 100, spacers 200, 300, end member 400, insulator 600, and side plate 700 according to the present embodiment. Specifically, (a) of FIG. 8 is a plan view of the above-mentioned component when viewed from the positive direction of the Y-axis, and (b) of FIG. ) is a sectional view of a portion of each component on the X-axis minus direction side and the Z-axis plus direction side. In addition, the parts on the X-axis positive direction and the parts on the X-axis negative direction of each component have the same configuration, and the parts on the Y-axis positive direction and the parts on the Y-axis negative direction have the same configuration. have. The same applies to the following.

Further, FIG. 9 is a perspective view showing the positional relationship among power storage element 100, spacers 200, 300, end member 400, insulator 600, and side plate 700 according to the present embodiment. Specifically, (a) in FIG. 9 is a perspective view showing a portion of the above-mentioned component on the positive side of the X axis and the negative side of the Y axis, and (b) of FIG. 9 is a perspective view of the above component. ) is a perspective view showing the configuration when the side plate 700 is removed.

Further, FIG. 10 is a cross-sectional view showing the positional relationship among power storage element 100, spacer 200, insulator 600, and side plate 700 according to the present embodiment. Specifically, FIG. 10(a) is a cross-sectional view of the above component taken along the XZ plane, as viewed from the negative Y-axis direction. Further, FIG. 10(b) is an enlarged view of the portion on the X-axis plus direction side and the Z-axis plus direction side of FIG. 10(a), and FIG. 10(c) is an enlarged view of the portion in FIG. FIG. 3 is an enlarged view showing a portion on the X-axis plus direction side and the Z-axis minus direction side in FIG. Note that FIGS. 10(b) and 10(c) show the configuration when the spacer 200 is removed from FIG. 10(a).

First, as shown in FIG. 8A, first protrusions 213 and 320 of spacers 200 and 300 are arranged to protrude along the convex portion (electrode terminal 120 or gasket 121) of power storage element 100. In this embodiment, the first protrusions 213 and 320 are arranged to extend in a long shape along the gasket 121. That is, the first protrusions 213 and 320 are protrusions that face the gasket 121 in the X-axis direction and protrude along the gasket 121. Specifically, two first protrusions 213 aligned in the X-axis direction are arranged between two gaskets 121 of one power storage element 100 and along the two gaskets 121 . The same applies to the first protrusion 320. Note that the two first protrusions 213 or the two first protrusions 320 may be arranged along the two gaskets 121 at positions sandwiching the two gaskets 121.

More specifically, the amount of protrusion of first protrusions 213 and 320 is smaller than half the width of container first surface 112a of power storage element 100 in the Y-axis direction. Thereby, the first protrusion 213 and the first protrusion 320, or the two first protrusions 213, which are adjacent to each other in the Y-axis direction, are arranged facing each other and spaced apart from each other. In other words, if two spacers sandwiching the electricity storage element 100 are one spacer and another spacer, and one spacer has one first protrusion and the other spacer has another first protrusion, one The first protrusion and the other first protrusion are arranged facing each other and spaced apart from each other.

Further, as shown in FIG. 8B, the spacers 200 and 300 are arranged at positions that do not protrude from the power storage element 100 in the X-axis direction. That is, the spacers 200 and 300 are arranged inside the power storage element 100 in the X-axis direction when viewed from the Y-axis direction. In other words, the spacers 200 and 300 are formed to have a width smaller than that of the power storage element 100 in the X-axis direction. Alternatively, it can be said that the spacer 200 does not have a portion facing the container second surface 111a.

Further, the uneven portions formed on the second protrusions 214 and 330 of the spacers 200 and 300 are arranged apart from the power storage element 100. Specifically, the concavo-convex portion of the second protrusion 214 has a convex portion 214a on the positive side of the Y-axis, a concave portion 214b on the negative side of the Y-axis of the convex portion 214a, and the convex portion 214a and the concave portion 214b are , are formed so as to be spaced apart from the power storage element 100. More specifically, the convex portion 214a is disposed along the container corner 111d of the power storage element 100 so as to protrude in the Y-axis positive direction. That is, the convex portion 214a is formed to protrude in a curved shape toward the container corner 111d while being spaced apart from the container corner 111d. Further, the third rib 615 of the insulator 600 is disposed at a position facing the spacer 200 and inserted into the recess 214b from the X-axis direction.

Regarding the spacer 300, the uneven portion of the second protrusion 330 has a recess 331 on the positive side of the Y-axis and a recess 332 on the negative side of the Y-axis, and the recesses 331 and 332 are spaced apart from the power storage element 100. It is formed so that it can be placed.

Further, as shown in FIG. 9A, the recess 711 of the side plate 700 has a shape that is cut out larger than the recess 613 of the insulator 600, so that the insulator 600 is exposed from the recess 711. It is in a state. That is, the recessed portion 711 is a recessed portion in which the outer edge of the side plate main body portion 710 on the Z-axis positive direction side is recessed relative to the insulator 600 .

Specifically, the recessed portion 711 is formed to be greatly recessed so that the rib 614 of the insulator 600 is exposed. That is, the rib 614 is arranged within the recess 711. Thereby, the first rib 614a is arranged closer to the extending direction of the extending portion 612 than the side plate 700 (in FIG. 9, the Y-axis minus direction side). Further, the second rib 614b is arranged closer to the electrode terminal 120 than the side plate 700 (in the positive Z-axis direction in FIG. 9).

Furthermore, the recessed portion 711 is arranged on the X-axis direction side of the end member 400 (the X-axis positive direction side in FIG. 9). Therefore, as shown in FIG. 9B, the extending portion 612, recess 613, and rib 614 of the insulator 600 are also arranged on the X-axis direction side of the end member 400. Here, as also shown in FIG. 8B, the end member 400 has a first corner 410 that is a corner on the power storage element 100 side (Y-axis positive direction side) and a first corner 410 that is opposite to the power storage element 100. It has a second corner 420 that is a corner on the side (Y-axis minus direction side). The radius of curvature of the outer edge of the first corner 410 is larger than that of the second corner 420. That is, the first corner 410 has a larger rounded outer edge than the second corner 420. Further, the recessed portion 711 is formed so that the radius of curvature of the outer edge thereof is larger than that of the first corner portion 410 . That is, the recess 711 has a curved outer edge, and the radius of curvature of the curved outer edge is larger than the radius of curvature of the outer edge of the first corner 410 .

Further, as shown in FIGS. 10A and 10C, the edge of the main body portion 211 of the spacer 200 on the Z-axis negative direction side is connected to the surface of the container 110 of the power storage element 100 on the Z-axis negative direction side (the container The third surface 111b) is located on the opposite side of the Z-axis minus direction. That is, spacer 200 is arranged so that main body portion 211 does not protrude from power storage element 100 in the negative Z-axis direction. Here, the edge of the third protrusion 215 of the spacer 200 on the Z-axis negative direction is on the same plane as the third surface 111b of the container of the power storage element 100 (on the same plane P in FIGS. 10(a) and 10(c)). ). That is, spacer 200 is arranged so that third protrusion 215 also does not protrude from power storage element 100 in the negative Z-axis direction. In other words, the third protrusion 215 has a shape that does not abut the surface of the power storage element 100 on the Z-axis negative direction side.

With such a configuration, the surface of power storage element 100 on the Z-axis negative direction side (container third surface 111b) is placed in contact with insulator second wall portion 630 of insulator 600. Further, the third protrusion 215 of the spacer 200 is also disposed in contact with the insulator second wall portion 630. In other words, since the third surface 111b of the container and the edge of the third protrusion 215 on the Z-axis negative direction side are arranged on the same plane P, they are placed on the second wall part 630 of the insulator. . Further, insulator 600 is further placed in contact with the surface of power storage element 100 on the X-axis direction side (container second surface 111a). Note that the insulator second wall portion 630 is fixed to the power storage element 100 by inserting the side plate third wall portion 740.

Further, as shown in FIGS. 10A and 10B, the first pressing portion 621 and the second pressing portion 622 provided on the insulator first wall portion 620 of the insulator 600 are arranged in the X-axis direction of the power storage element 100. Press both ends of in the negative Z-axis direction. Note that the insulator first wall portion 620 is fixed to the power storage element 100 by inserting the side plate second wall portion 730. Thereby, the third surface 111b of the container is pressed against the cooling device 20, and the power storage element 100 is cooled. Here, since the plurality of power storage elements 100 are pressed by one insulator 600 and pressed onto the insulator second wall part 630, the container third surface 111b of the plurality of power storage elements 100 is aligned on the same plane P. Placed. As a result, the container third surfaces 111b of the plurality of power storage elements 100 are evenly pressed against the cooling device 20 and cooled.

Note that although the spacer 200 has been described in FIG. 10, the spacer 300 also has a similar configuration.

[8 Explanation of effects]
As described above, according to the power storage device 10 according to the present embodiment, the power storage element 100 has the electrode terminal 120 on the second direction (Z-axis positive direction) side, and the power storage element 100 and the insulating member The conductive member (side plate 700) disposed at a position sandwiching the (insulator 600) has a recess 711 with a recessed outer edge on the second direction side. Here, in the power storage element 100, current flows through the electrode terminal 120, so in order to ensure insulation between the power storage element 100 and the conductive member, it is necessary to connect the electrode terminal 120 of the power storage element 100 and the conductive member It is important to ensure insulation between the For this reason, a recess 711 having a recessed outer edge on the second direction side (electrode terminal 120 side) is formed in the conductive member. Thereby, the creepage distance between the electrode terminal 120 of the power storage element 100 and the conductive member can be increased, so that the insulation between the power storage element 100 and the conductive member can be improved.

Further, the recess 711 is a recess formed such that the outer edge of the conductive member on the second direction side is recessed relative to the insulating member. In this way, by making the recess 711 a recess that is deeper than the insulating member, the creepage distance between the electrode terminal 120 of the power storage element 100 and the conductive member can be increased, so that the distance between the power storage element 100 and the conductive member can be increased. It is possible to improve the insulation between the members.

Furthermore, the recess 711 has a curved outer edge shape. In this way, even when the recess 711 is formed in the conductive member in order to increase the creepage distance between the electrode terminal 120 of the power storage element 100 and the conductive member, the shape of the outer edge of the recess 711 is curved. Damage to the conductive member due to local stress applied to 711 can be suppressed.

Further, the insulating member has a rib 614 disposed within the recess 711. In this way, by arranging the rib 614 of the insulating member within the recess 711, the creepage distance between the electrode terminal 120 of the power storage element 100 and the conductive member can be further increased. The insulation between the conductive member and the conductive member can be further improved.

Further, the recess 711 is arranged on the first direction (X-axis direction) side of the side member (end member 400) arranged on the side of the power storage element 100. In this way, in the conductive member, by forming the recess 711 on the first direction side of the side member, the strength of the conductive member on the first direction side of the power storage element 100 is suppressed from decreasing. I can do it. Thereby, it is possible to improve the insulation between the power storage element 100 and the conductive member while suppressing a decrease in the strength of the conductive member.

Further, in the side member, the first corner 410 on the side of the power storage element 100 is formed to have a larger radius of curvature of the outer edge than the second corner 420 on the opposite side to the power storage element 100, and the recess 711 The radius of curvature of the outer edge is larger than that of the first corner 410 . In this way, since the side member has a large radius of curvature of the outer edge of the first corner 410 that is closer to the power storage element 100, it is possible to increase the creepage distance between the power storage element 100 and the side member. can. Thereby, even if the side member and the conductive member are electrically connected, it is possible to improve the insulation between the power storage element 100 and the conductive member. Moreover, since the first corner 410 of the side member has a radius of curvature of the outer edge that is not formed larger than that of the recess 711, there is a gap between the first corner 410 and the second corner 420 in the side member. A straight line portion of a certain length is formed. Thereby, the electrically conductive member can be opposed to the linear portion of the side member, so the electrically conductive member can be easily positioned with respect to the side member.

In addition, in the power storage element 100, current flows through the electrode terminal 120, so in order to ensure insulation between the power storage element 100 and the conductive member (side plate 700), the electrode terminal 120 of the power storage element 100 must be It is important to ensure insulation between the conductive member and the conductive member. Therefore, in the first insulating member (insulator 600) between the power storage element 100 and the conductive member, a portion on the electrode terminal 120 side is extended. Thereby, the creepage distance between the electrode terminal 120 of the power storage element 100 and the conductive member can be increased, so that the insulation between the power storage element 100 and the conductive member can be improved.

In addition, in order to press all the power storage elements 100 with a large force in the pressing members (insulator 600 and side plate 700), it is necessary to arrange them so that all the pressing parts press all the power storage elements 100 with a large force. Since it may become difficult to configure the pressing member, the pressing forces of the pressing portions are varied. In this way, since it is not necessary to press all the power storage elements 100 with a large force using all the pressing parts, it is possible to easily configure a pressing member that presses a plurality of power storage elements 100.

In addition, in the configuration in which the power storage element 100 and the spacers 200, 300 are joined by the joining members 510, 520, the spacer 200, 300 is directed toward the power storage element 100 from the spacer first surfaces 211a, 311 on which the joining members 510, 520 are arranged. A first protrusion is provided that protrudes. Thereby, even if the joining members 510 and 520 are compressed by the force that causes the power storage element 100 to swell when the power storage element 100 is about to swell, the first protrusion can suppress the bulge of the power storage element 100. Further, even if the joining members 510 and 520 are not compressed by the force that causes the power storage element 100 to swell due to high hardness of the joining members 510 and 520, there is a risk that the power storage element 100 will swell toward parts other than the joining members 510 and 520. . However, even in this case, by arranging the first protrusion, it is possible to suppress the power storage element 100 from expanding toward parts other than the joining members 510 and 520.

Furthermore, by forming the first protrusions 213 and 320 that protrude along the convex portion (gasket 121) of the power storage element 100 on the spacers 200 and 300, the spacer 200 and 300 It is possible to position the power storage element 100 and the spacers 200, 300 without providing the spacers 200, 300. Thereby, it is possible to suppress the width of power storage device 10 from increasing, and it is possible to reduce the size of power storage device 10.

In addition, by arranging the first member 201 with high heat resistance in the spacer 200 at a position that contacts the side surface of the power storage element 100, even if the power storage element 100 reaches a high temperature, the spacer 200 will not be deformed or melted. It can be suppressed from doing so. Further, the spacer 200 often has a complicated shape in order to insulate or hold the power storage element 100, but it is generally difficult to process a highly heat-resistant member into a complicated shape. be. Therefore, by configuring the spacer 200 to include the second member 210 that supports the end portion of the first member 201 having high heat resistance, the second member 210 can insulate or hold the power storage element 100. If the first member 201 is formed in such a way that it can be formed, there is no need to process the first member 201 into a complicated shape. In particular, since the second member 210 is made of resin and can be formed into a complicated shape, it can be easily formed into a structure that insulates or holds the power storage element 100. Thereby, the first member 201 having high heat resistance can be easily placed on the spacer 200. As described above, even if the power storage element 100 reaches a high temperature (for example, 600 degrees Celsius) due to an abnormality in the power storage element 100, the first member 201 can prevent the spacer 200 from deforming or melting. Therefore, it is possible to maintain the functions of the spacer 200, such as suppressing swelling and insulating the power storage element 100, and it is possible to suppress the occurrence of problems.

Further, spacers 200 and 300 are provided with third protrusions 215 and 340 having a shape that protrudes toward the negative Z-axis side of power storage element 100 but do not come into contact with the surface of power storage element 100 in the negative Z-axis direction. The three protrusions 215 and 340 position the main bodies 211 and 310 of the spacers 200 and 300 at positions where they do not protrude beyond the surface of the power storage element 100 in the negative Z-axis direction. Thereby, the surface of the power storage element 100 on the negative side of the Z axis can be brought into contact with the cooling device 20 without being obstructed by the main bodies 211, 310 and the third protrusions 215, 340 of the spacers 200, 300. Power storage element 100 can be easily cooled.

Furthermore, by arranging the spacers 200 and 300 inward of the power storage element 100 in the X-axis direction (that is, formed so as not to protrude from the power storage element 100 in the X-axis direction), the width of the power storage device 10 in the X-axis direction can be increased. can be suppressed from increasing. Furthermore, by forming uneven portions that are spaced apart from the power storage element 100 at the ends of the spacers 200 and 300 in the X-axis direction, the power storage element 100 and other members can be separated from each other at the ends of the spacers 200 and 300 in the X-axis direction. (neighboring power storage element 100, etc.) can increase the creepage distance. Thereby, it is possible to reduce the size of power storage device 10 while achieving insulation at the ends of power storage element 100 in the X-axis direction.

[9 Description of modification]
Although the power storage device 10 according to the present embodiment has been described above, the present invention is not limited to the above embodiment. In other words, the embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the above description, and it is intended that all changes within the meaning and range equivalent to the claims are included.

For example, in the embodiment described above, the recess 711 of the side plate 700 is a recess that is formed to be more recessed than the insulator 600. However, the recess 711 does not have to be deeper than the insulator 600; for example, the recess 711 may be formed in the same shape as the recess 613 of the insulator 600.

Further, in the above embodiment, the recess 711 of the side plate 700 has a curved outer edge shape, but it may be formed only with a straight outer edge shape.

Further, in the embodiment described above, the recess 711 of the side plate 700 is disposed on the X-axis direction side of the end member 400, and the radius of curvature of the outer edge is formed larger than that of the first corner 410 of the end member 400. It was decided that However, the recessed portion 711 may be arranged at a position other than the X-axis direction side of the end member 400, or may have an outer edge shape with a smaller radius of curvature than the first corner portion 410.

Further, in the above embodiment, the extending portion 612 of the insulator 600 is formed with a rib 614 having a first rib 614a and a second rib 614b. However, the extending portion 612 may not be provided with either the first rib 614a or the second rib 614b, or may not be provided with the entire rib 614.

Further, in the embodiment described above, the power storage element 100 includes the insulating sheet 130 that covers most of the container body 111. However, the insulating sheet 130 may be configured to cover only the third container surface 111b (and the vicinity of the third container surface 111b), or the entire insulating sheet 130 may not be provided.

Further, in the above embodiment, both of the two side plates 700 have the above configuration, but one of the side plates 700 may have a configuration different from the above. The same applies to insulator 600, power storage element 100, and spacers 200 and 300.

Furthermore, the scope of the present invention also includes a configuration constructed by arbitrarily combining each component included in the above embodiment and its modified examples.

Further, the present invention can be realized not only as such power storage device 10 but also as insulator 600 or side plate 700.

INDUSTRIAL APPLICATION This invention is applicable to the electrical storage device etc. which are equipped with electrical storage elements, such as a lithium ion secondary battery.

10 Power storage device 20 Cooling device 100 Power storage element 110 Container 111a Second container surface 111b Third container surface 111c Fourth container surface 112a First container surface 120 Electrode terminal 130 Insulating sheet 200, 300 Spacer 400 End member 410 First corner 420 Second corner part 600 Insulator 611 Opposing part 612 Extended part 613 Recessed part 614 Rib 614a First rib 614b Second rib 621 First pressing part 622 Second pressing part 700 Side plate 711, 712 Recessed part

Claims (6)

a plurality of power storage elements arranged in a third direction, a pair of end members sandwiching the plurality of power storage elements in the third direction, and arranged on the first direction side intersecting the third direction of the plurality of power storage elements, A power storage device comprising: a side plate attached to the pair of end members; and an insulating member disposed between the plurality of power storage elements and the side plate so as to straddle the plurality of power storage elements ,
A power storage element located at an end in the third direction of the plurality of power storage elements has an electrode terminal disposed on a second direction side intersecting the first direction and the third direction,
The side plate has a recessed portion at the end in the third direction, the outer edge of which is recessed in the second direction,
The said insulating member has a rib arrange|positioned in the said recessed part. Power storage device. a plurality of power storage elements arranged in a third direction, a pair of end members sandwiching the plurality of power storage elements in the third direction, and arranged on the first direction side intersecting the third direction of the plurality of power storage elements, A power storage device comprising: a side plate attached to the pair of end members; and an insulating member disposed between the plurality of power storage elements and the side plate so as to straddle the plurality of power storage elements ,
A power storage element located at an end in the third direction of the plurality of power storage elements has an electrode terminal disposed on a second direction side intersecting the first direction and the third direction,
The side plate is located inside the tip in the third direction, and has a recess that is recessed from the outer edge of the tip in the second direction toward the opposite side to the second direction. Has a power storage device. a plurality of power storage elements arranged in a third direction, a pair of end members sandwiching the plurality of power storage elements in the third direction, and arranged on the first direction side intersecting the third direction of the plurality of power storage elements, A power storage device comprising: a side plate attached to the pair of end members; and an insulating member disposed between the plurality of power storage elements and the side plate so as to straddle the plurality of power storage elements ,
A power storage element located at an end in the third direction of the plurality of power storage elements has an electrode terminal disposed on a second direction side intersecting the first direction and the third direction,
The side plate is disposed on the first direction side of the end member and has a recessed part with a recessed outer edge on the second direction side,
The end member has an outer edge having a radius of curvature larger at a first corner on the side of the plurality of power storage elements than at a second corner on the opposite side from the plurality of power storage elements,
The concave portion has an outer edge having a radius of curvature larger than that of the first corner portion. a plurality of power storage elements arranged in a third direction, a pair of end members sandwiching the plurality of power storage elements in the third direction, and arranged on the first direction side intersecting the third direction of the plurality of power storage elements, A power storage device comprising: a side plate attached to the pair of end members; and an insulating member disposed between the plurality of power storage elements and the side plate so as to straddle the plurality of power storage elements ,
A power storage element located at an end in the third direction of the plurality of power storage elements has an electrode terminal disposed on a second direction side intersecting the first direction and the third direction,
The side plate is disposed on the first direction side of the end member, and the outer edge on the second direction side is on a side opposite to the second direction from the outer edge of the end member on the second direction side. A power storage device with a recessed part. The power storage device according to any one of claims 1 to 4, wherein the recess is a recess in which an outer edge of the side plate on the second direction side is recessed relative to the insulating member. The power storage device according to any one of claims 1 to 5, wherein the recess has a curved outer edge shape.

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