Power storage device

Abstract

The power storage device (10) comprises: a first end face component (301) and a second end face component (302) for sandwiching a plurality of power storage elements (100) in a first direction; and a first side face component (401) and a second side face component (402) for sandwiching a plurality of power storage elements (100) in a second direction, wherein the first end face component (301) comprises a first end face connection portion (321) connected to the first side face component (401) and a second end face connection portion connected to the second side face component (402). (331), the first side component (401) has a first side connection portion (421) connected to the first end surface connection portion (321), the second side component (402) has a second side connection portion (432) connected to the second end surface connection portion (331), the first end surface connection portion (321) and the first side connection portion (421) overlap and are joined in the first direction, and the second end surface connection portion (331) and the second side connection portion (432) overlap and are joined in the second direction.

Description

Technical Field

[0001] The present invention relates to an electric storage device including a plurality of electric storage elements. Background Art

[0002] A conventionally known power storage device includes: a plurality of power storage elements, an end face component disposed at a position sandwiching the plurality of power storage elements, and a side face component connected to the end face component. Patent document 1 discloses a battery system (power storage device) including: a plurality of battery cells (power storage elements), an end plate (end face component) for pressing and fixing the plurality of battery cells in a stacking direction, and a binding member (side face component) connected to the end plate.

[0003] (Prior art literature)

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-185415

[0006] The above-described conventional power storage device has a problem in that the restraining force applied to the power storage element is biased. Summary of the invention

[0007] An object of the present invention is to provide an electric storage device capable of suppressing the bias of the restraining force on the electric storage element.

[0008] An embodiment of the present invention relates to an electricity storage device, which includes: a plurality of electricity storage elements arranged in a first direction; a first end face component and a second end face component arranged at positions sandwiching the plurality of electricity storage elements in the first direction; and a first side face component and a second side face component arranged at positions sandwiching the plurality of electricity storage elements in a second direction, wherein the second direction is a direction intersecting the first direction, the first end face component having a first end face connecting portion connected to the first side face component and a second end face connecting portion connected to the second side face component, the first side face component having a first side face connecting portion connected to the first end face connecting portion, the second side face component having a second side face connecting portion connected to the second end face connecting portion, the first end face connecting portion and the first side face connecting portion overlapping and joined in the first direction, and the second end face connecting portion and the second side face connecting portion overlapping and joined in the second direction.

[0009] The present invention can be realized not only as such an electric storage device but also as an end surface member and a side surface member included in the electric storage device.

[0010] According to the power storage device of the present invention, it is possible to suppress the bias of the restraining force on the power storage element. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a perspective view showing the outer appearance of the power storage device according to the embodiment.

[0012] Figure 2 It is an exploded perspective view showing each component when the power storage device according to the embodiment is exploded.

[0013] Figure 3 It is a perspective view showing the structure of the power storage element according to the embodiment.

[0014] Figure 4 It is a perspective view showing the structure of the end surface members (the first end surface member and the second end surface member) according to the embodiment.

[0015] Figure 5 It is a perspective view showing the structure of the side members (the first side member and the second side member) according to the embodiment.

[0016] Figure 6 It is a cross-sectional view showing a structure when the end surface members (the first end surface member and the second end surface member) and the side surface members (the first side surface member and the second side surface member) are connected according to the embodiment. DETAILED DESCRIPTION

[0017] In the above-mentioned conventional structure of the power storage device, there is a problem that the restraining force on the power storage element is biased. In the above-mentioned patent document 1, the end face component and the side component are overlapped and connected in the arrangement direction of the plurality of power storage elements. The inventor of the present application found that in such a structure, since the restraining force is concentrated on the two ends of the side component side of the power storage element, the restraining force on the power storage element may be biased.

[0018] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an electric storage device capable of suppressing the bias of the restraining force on the electric storage element.

[0019] In order to achieve the above-mentioned object, one embodiment of the present invention relates to an electricity storage device, which comprises: a plurality of electricity storage elements arranged in a first direction; a first end surface component and a second end surface component arranged at positions sandwiching the plurality of electricity storage elements in the first direction; and a first side surface component and a second side surface component arranged at positions sandwiching the plurality of electricity storage elements in a second direction, the second direction being a direction intersecting the first direction, the first end surface component having a first end surface connection portion connected to the first side surface component, and a second end surface connection portion connected to the second side surface component, the first side surface component having a first side surface connection portion connected to the first end surface connection portion, the second side surface component having a second side surface connection portion connected to the second end surface connection portion, the first end surface connection portion and the first side surface connection portion overlapping and being joined in the first direction, and the second end surface connection portion and the second side surface connection portion overlapping and being joined in the second direction.

[0020] As described above, in the power storage device, the first end face connection portion of the first end face component and the first side face connection portion of the first side face component overlap and are joined in the first direction, and the second end face connection portion of the first end face component and the second side face connection portion of the second side face component overlap and are joined in the second direction. In this way, the first end face component and the first side face component are joined in the first direction, and the first end face component and the second side face component are joined in the second direction, so that the first end face component is joined in different directions such as the first direction and the second direction. In this way, the power storage element can be constrained in the first direction, and the constraining force can be suppressed from being concentrated on the two end portions of the side face component side of the power storage element, thereby suppressing the bias of the constraining force on the power storage element.

[0021] The second end surface component may include a third end surface connection portion connected to the second side surface component, and the second side surface component may include a third side surface connection portion connected to the third end surface connection portion, and the third end surface connection portion and the third side surface connection portion may overlap and be joined in the first direction.

[0022] As described above, in the power storage device, the third end surface connection portion of the second end surface component and the third side surface connection portion of the second side surface component overlap and are joined in the first direction. In this way, the second end surface component is joined to the second side surface component in the first direction, and the second side surface component joined to the first end surface component in the second direction is joined to the second end surface component in the first direction. Thus, the restraining force of the power storage element in the first direction can be increased, and the bias of the restraining force on the power storage element can be suppressed.

[0023] The second end face component may have a fourth end face connection portion connected to the first side face component, the first side face component may have a fourth side face connection portion connected to the fourth end face connection portion, and the fourth end face connection portion and the fourth side face connection portion may overlap and be joined in the second direction.

[0024] As described above, in the power storage device, the fourth end surface connection portion of the second end surface component and the fourth side surface connection portion of the first side surface component overlap and are joined in the second direction. In this way, by joining the second end surface component and the first side surface component in the second direction, both of the two end surface components and the two side surface components are joined in different directions, such as the first direction and the second direction, and both of the two side surface components are joined to the two end surface components in the different directions. Therefore, the power storage element is restrained in a balanced manner by the two end surface components and the two side surface components, so that the bias of the restraining force on the power storage element can be suppressed.

[0025] The first end surface connection portion may include a recessed portion recessed in the first direction, and the first side surface connection portion may be arranged in the recessed portion and joined to the first end surface connection portion.

[0026] As described above, the first side surface connection portion of the first side surface component is arranged in the recessed portion of the first end surface connection portion of the first end surface component, which is recessed in the first direction, and is joined to the first end surface connection portion. In this way, when the first side surface connection portion is joined to the first end surface connection portion, it is arranged in the recessed portion of the first end surface connection portion, thereby preventing the first side surface connection portion from protruding from the first end surface connection portion in the first direction. Therefore, it is possible to prevent the first side surface component from protruding from the first end surface component in the first direction, thereby saving space and preventing the bias of the restraining force on the storage element.

[0027] The second end surface connection portion may be a side wall of the first end surface member in the second direction, and the second side surface connection portion and the side wall may overlap and be joined in the second direction.

[0028] As described above, the second side surface connection portion of the second side surface component overlaps and is joined to the side wall in the second direction of the second end surface connection portion of the first end surface component. In this way, the second side surface connection portion overlaps and is joined to the side wall of the first end surface component in the second direction, thereby preventing the second side surface connection portion from protruding from the first end surface component in the first direction. Thus, preventing the second side surface component from protruding from the first end surface component in the first direction can save space and prevent the bias of the restraining force on the storage element.

[0029] The following describes an embodiment of the present invention involving a power storage device with reference to the accompanying drawings. The embodiments described below are all general or specific examples of the present disclosure. The numerical values, shapes, materials, components, configuration positions of components, connection forms, manufacturing processes, and the order of manufacturing processes shown in the following embodiments are all examples, and their main purpose is not to limit the present invention. Among the components of the following embodiments, the components that are not recorded in the highest-level concept of independent technical solutions are described as arbitrary components. In the figures, dimensions, etc. are not strictly illustrated.

[0030] In the following description and drawings, the arrangement direction of a pair of electrode terminals in one storage element, the relative direction of a pair of short sides in a container of one storage element, the arrangement direction of a pair of side parts, or the arrangement direction of a storage element and a side part is defined as the X-axis direction. The arrangement direction of multiple storage elements, the arrangement direction of multiple partition parts, the arrangement direction of a pair of end face parts, the arrangement direction of a storage element, a partition part, and an end face part, the relative direction of a pair of long sides in a container of one storage element, or the thickness direction of the storage element, the partition part, or the end face part is defined as the Y-axis direction. The arrangement direction of the container body and the lid of the storage element, the arrangement direction of the storage element, the bus bar holding part, and the bus bar, or the up and down direction is defined as the Z-axis direction. These X-axis directions, Y-axis directions, and Z-axis directions are directions that intersect each other (orthogonal in this embodiment). Depending on the usage, the Z-axis direction may not be the up and down direction, but for the convenience of explanation below, the Z-axis direction is described as the up and down direction. In the following description, the positive direction of the X-axis indicates the direction of the arrow mark of the X-axis, and the negative direction of the X-axis indicates the direction opposite to the positive direction of the X-axis. The same is true for the Y-axis direction and the Z-axis direction. In the following description, the Y-axis direction is sometimes referred to as the first direction, and the X-axis direction is sometimes referred to as the second direction.

[0031] (Implementation Method)

[0032] [1 Overall Description of Power Storage Device 10]

[0033] First, the structure of the power storage device 10 will be described. Figure 1 It is a perspective view showing the outer appearance of the power storage device 10 according to the present embodiment. Figure 2 It is an exploded perspective view showing each component when the power storage device 10 according to the present embodiment is exploded.

[0034] The power storage device 10 is a device that can charge electricity from the outside and discharge it to the outside. The power storage device 10 is a battery module (battery assembly) used for power storage purposes or power supply purposes. Specifically, the power storage device 10 can be used as a fixed battery for driving or starting an engine of a mobile body, or for household use or a generator. The above-mentioned mobile body includes automobiles such as electric vehicles (EV), hybrid electric vehicles (HEV) or plug-in hybrid electric vehicles (PHEV), motorcycles, ships, snowmobiles, agricultural machinery, construction machinery, or railway vehicles for electric railways such as trams, monorails or linear motor drive vehicles, etc.

[0035] like Figure 1 as well as Figure 2 As shown, the power storage device 10 includes a plurality of power storage elements 100 , a plurality of spacer members 200 , a pair of end surface members 300 , a pair of side surface members 400 , a bus bar holding member 500 , a plurality of bus bars 600 , and a substrate 700 .

[0036] The storage element 100 is a secondary battery (single cell) that can be charged and discharged, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. The storage element 100 is in the shape of a flat rectangular parallelepiped (square) and is arranged adjacent to the partition member 200. In other words, the plurality of storage elements 100 are alternately arranged with each of the plurality of partition members 200 and arranged in the Y-axis direction (first direction). In this embodiment, each of the 13 partition members 200 is arranged at a position sandwiching each of the 12 storage elements 100.

[0037] The number of the storage elements 100 is not limited to 12, and may be a number other than 12. The shape of the storage element 100 is not particularly limited, and any shape other than a rectangular parallelepiped shape, such as a polygonal prism shape, a cylindrical shape, an elliptical prism shape, a long cylindrical shape, etc., may be used, and it may also be a laminated storage element. The storage element 100 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, and may be a capacitor. The storage element 100 may not be a secondary battery, and may be a primary battery that can use the stored electricity even if the user does not charge it. The storage element 100 may be a battery using a solid electrolyte. A detailed description of the structure of the storage element 100 will be described later.

[0038] The partition member 200 is arranged on the side (in the positive direction of the Y axis or the negative direction of the Y axis) of the energy storage element 100. The partition member 200 is a rectangular plate-shaped member for insulating the energy storage element 100 from other members. Specifically, the partition member 200 is arranged between two adjacent energy storage elements 100 and between the energy storage element 100 at the end and the end surface member 300 to insulate the two energy storage elements 100 and between the energy storage element 100 at the end and the end surface member 300. In the present embodiment, 13 partition members 200 are arranged corresponding to 12 energy storage elements 100. However, when the number of energy storage elements 100 is not 12, the number of the partition members 200 is also changed according to the number of energy storage elements 100.

[0039] The partition member 200 is formed so as to cover approximately half of the front side or back side (the negative Y-axis side or the positive Y-axis side) of the short side (the short side 122 described later) of the storage element 100 in addition to the long side (the long side portion 121 described later) of the storage element 100. In other words, a recess is formed on both sides (the two sides in the Y-axis direction) of the front side or back side of the partition member 200, and approximately half of the storage element 100 is inserted into the recess. With such a structure, the two partition members 200 sandwiching the storage element 100 cover the short side of the storage element 100, so that the insulation between the storage element 100 and the side member 400 can be ensured.

[0040] The partition member 200 is formed of insulating resin materials such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate (PET), polyetheretherketone (PEEK), soluble polytetrafluoroethylene (PFA), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), polyethersulfone (PES), ABS resin, and composite materials thereof. The partition member 200 may be formed of materials other than resin as long as it has insulating properties, and may be formed of ceramics or mica plates formed by aggregating and bonding mica sheets. All of the plurality of partition members 200 may not be formed of the same material.

[0041] The end face member 300 and the side face member 400 are members for pressing the energy storage element 100 from the outside in the arrangement direction (Y-axis direction, first direction) of the plurality of energy storage elements 100. In other words, the end face member 300 and the side face member 400 sandwich the plurality of energy storage elements 100 from both sides of the arrangement direction, thereby pressing each of the plurality of energy storage elements 100 from both sides of the arrangement direction.

[0042] Specifically, the end face component 300 is a flat block-shaped end plate (clamping component) that is arranged on both sides of the plurality of energy storage elements 100 in the Y-axis direction and holds the plurality of energy storage elements 100 by clamping them from both sides in the arrangement direction (Y-axis direction) of the plurality of energy storage elements 100. The end face component 300 is formed of a metal (conductive) material such as aluminum, aluminum alloy, stainless steel, iron, plated steel plate, etc. from the viewpoint of ensuring strength. The material of the end face component 300 is not particularly limited, and for example, it may be formed of a high-strength insulating material or may be subjected to insulation treatment. The end face component 300 is not limited to a block-shaped end plate, but may also be a plate-shaped end plate.

[0043] In the pair of end surface components 300, the end surface component 300 located on the negative side of the Y axis is referred to as the first end surface component 301, and the end surface component 300 located on the positive side of the Y axis is referred to as the second end surface component 302. The details of the structure of the pair of end surface components 300 (the first end surface component 301 and the second end surface component 302) will be described later.

[0044] The side member 400 is a slender and flat side plate (constraint member, constraint strip) whose two ends are mounted on the end face member 300 to constrain the plurality of storage elements 100. In other words, the side member 400 is extended in the Y-axis direction in a manner spanning the plurality of storage elements 100 and the plurality of partition members 200, and a constraint force is applied to the plurality of storage elements 100 and the plurality of partition members 200 in the arrangement direction (Y-axis direction). In the present embodiment, a pair of side members 400 is arranged on both sides of the plurality of storage elements 100 and the plurality of partition members 200 in the X-axis direction. Each of the pair of side members 400 is mounted on the X-axis direction ends of the pair of end face members 300 at both ends in the Y-axis direction. Thus, the pair of side members 400 sandwich and constrain the plurality of storage elements 100 and the plurality of partition members 200 from both sides in the X-axis direction and both sides in the Y-axis direction.

[0045] The side member 400 is joined to the end member 300 by a plurality of joining members 400a arranged in the Z-axis direction. In the present embodiment, the joining members 400a are bolts that penetrate the side member 400 and are fastened to the end member 300. The side member 400, like the end member 300, is formed of a metal (conductive) material such as aluminum, aluminum alloy, stainless steel, iron, plated steel plate, etc. from the viewpoint of ensuring strength, and can be formed of a high-strength insulating member, or can be subjected to insulation treatment. The side member 400 may not be a plate-shaped side plate, but may be a block-shaped or rod-shaped member, etc.

[0046] In the pair of side members 400, the side member 400 on the positive direction side of the X axis is referred to as the first side member 401, and the side member 400 on the negative direction side of the X axis is referred to as the second side member 402. The details of the structure of the pair of side members 400 (the first side member 401 and the second side member 402) will be described later.

[0047] The bus bar holding member 500 is a plate-shaped member (bus bar plate, bus bar frame) for holding the bus bar 600 and the substrate 700, etc., and isolating the bus bar 600, etc. from other members and limiting the position of the bus bar 600, etc. The bus bar holding member 500 is formed of a resin material having the same insulating properties as the partition member 200, such as PC, PP, PE, etc.

[0048] The bus bar 600 is a conductive plate-shaped member that is arranged on a plurality of energy storage elements 100 and electrically connects the electrode terminals (electrode terminals 140 described later) of the plurality of energy storage elements 100 to each other. In the present embodiment, the bus bar 600 connects the plurality of energy storage elements 100 in series by sequentially connecting the positive terminals and negative terminals of adjacent energy storage elements 100. The bus bar 600 arranged at the end is connected to the terminals of the energy storage device 10, namely, the external terminals 610 (positive external terminals, negative external terminals). The bus bar 600 is formed of a conductive member made of a metal such as copper, copper alloy, aluminum, aluminum alloy, etc. There is no particular limitation on the connection form of the energy storage elements 100, and any energy storage elements 100 may be connected in parallel.

[0049] The substrate 700 is a circuit substrate mounted on the busbar holding member 500, and is provided with electronic components, fuses, relays, shunt resistors, connectors, etc. for monitoring the charging state or discharging state of the storage element 100. The substrate 700 is connected to the wiring 710 via the connector. The wiring 710 includes wiring for measuring the voltage of the storage element 100 and wiring for measuring the temperature.

[0050] [2 Description of the Energy Storage Element 100]

[0051] Next, the structure of the energy storage element 100 will be described in detail. Figure 3 It is a perspective view showing the structure of the energy storage device 100 according to the present embodiment.

[0052] like Figure 3As shown, the storage element 100 includes a container 110, a pair of electrode terminals 140 (positive terminal and negative terminal), and a pair of gaskets 150. The inside of the container 110 contains an electrode body, a collector (positive collector and negative collector), and an electrolyte (non-aqueous electrolyte), but these are omitted in the figure. As the electrolyte, there is no particular limitation on its type as long as it does not impair the performance of the storage element 100, and various types can be selected. A separator can be arranged on the side of the collector, or an insulating sheet covering the outer surface of the container 110 can be arranged.

[0053] The container 110 is a rectangular parallelepiped (square) container having a container body 120 with an opening formed therein and a cover 130 that closes the opening of the container body 120. The container body 120 is a rectangular cylindrical member that constitutes the main body of the container 110 and has a bottom, and has a pair of long side portions 121 on the sides of the Y-axis direction, a pair of short side portions 122 on the sides of the X-axis direction, and a bottom portion 123 on the negative direction side of the Z-axis. The short side portion 122 is a rectangular plane that is adjacent to the pair of long side portions 121 and the bottom portion 123 and has a smaller area than the long side portion 121. The bottom portion 123 is a rectangular plane that is adjacent to the pair of long side portions 121 and the pair of short side portions 122. The long side portion 121 is a rectangular plane that is adjacent to the pair of short side portions 122 and the bottom portion 123 and has a larger area than the short side portion 122. The cover 130 is a rectangular plate-shaped member constituting the cover of the container 110, and is arranged on the positive Z-axis direction side of the container body 120. The cover 130 is also provided with a gas release valve 131 for releasing the pressure when the pressure inside the container 110 rises, and a liquid injection part 132 for injecting electrolyte into the container 110.

[0054] With such a configuration, the container 110 is structured such that after the electrode body and the like are housed inside the container body 120, the container body 120 and the lid 130 are joined by welding or the like, thereby sealing the inside. The material of the container 110 (container body 120 and lid 130) is not particularly limited, and is preferably a metal that can be welded (joined), such as stainless steel, aluminum, aluminum alloy, iron, or plated steel.

[0055] The electrode terminal 140 is a terminal (positive terminal and negative terminal) of the energy storage element 100 disposed on the cover 130 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. In other words, the electrode terminal 140 is a metal component for conducting electricity stored in the electrode body to the external space of the energy storage element 100, and conducting electricity to the internal space of the energy storage element 100 in order to store electricity in the electrode body. The electrode terminal 140 is formed of aluminum, aluminum alloy, copper, copper alloy, etc.

[0056] The gasket 150 is disposed between the electrode terminal 140 and the cover 130, and between the cover 130 and the current collector, and is a component for ensuring insulation and airtightness between the electrode terminal 140 and the cover 130, and between the cover 130 and the current collector. The gasket 150 is formed of an insulating material such as PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, or ABS resin.

[0057] The electrode body is an electric storage element (power generation element) formed by stacking a positive electrode plate, a negative electrode plate and a separator. The positive electrode plate of the electrode body is composed of a positive electrode active material layer formed on a positive electrode substrate layer, and the positive electrode substrate layer is a thin strip of collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate is composed of a negative electrode active material layer formed on a negative electrode substrate layer, and the negative electrode substrate layer is a thin strip of collector foil made of metal such as copper or a copper alloy. 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, as long as lithium ions can be absorbed and released, known materials can be appropriately used. The collector is a conductive and rigid component (positive electrode collector and negative electrode collector) electrically connected to the electrode terminal 140 and the electrode body. The positive electrode current collector is made of aluminum or an aluminum alloy, like the positive electrode substrate layer of the positive electrode plate, and the negative electrode current collector is made of copper or a copper alloy, like the negative electrode substrate layer of the negative electrode plate.

[0058] [3. Description of the End Surface Member 300 and the Side Surface Member 400]

[0059] [3.1 Description of the end surface member 300]

[0060] Next, the structures of the end surface member 300 and the side surface member 400 will be described in detail. First, the structures of the end surface member 300 (the first end surface member 301 and the second end surface member 302) will be described in detail. Figure 4 3 is a perspective view showing the structure of the end surface member 300 (the first end surface member 301 and the second end surface member 302) of this embodiment. Specifically, Figure 4 (a) shows Figure 2 3 is a perspective view of the structure of the first end surface component 301 in the embodiment, or the structure when the second end surface component 302 is rotated 180 degrees around the Z axis. Figure 4 (b) shows the image viewed from the opposite side of the Y-axis direction. Figure 4 (a) is a perspective view of the structure of the end surface member 300. The first end surface member 301 and the second end surface member 302 have the same structure when rotated 180 degrees around the Z axis, and therefore are shown in the same figure.

[0061] like Figure 4As shown, the end surface member 300 includes an end surface main body portion 310 , an end surface connection portion 320 and an end surface connection portion 330 , and two fixing portions 340 .

[0062] The end face main body 310 is a rectangular and block-shaped portion constituting the main body of the end face component 300. In the present embodiment, the end face main body 310 has a shape in which a plurality of rectangular recesses 310a recessed toward the positive direction of the Y axis are formed in a rectangular parallelepiped portion that is long in the X-axis direction and thin in the Y-axis direction, but the shape of the end face main body 310 is not particularly limited. In other words, recesses 310a of any shape and any number may be formed in the end face main body 310, and recesses 310a may not be formed in the end face main body 310. The fixing portion 340 is a portion protruding from the end of the end face main body 310 on the negative side of the Z axis in the negative direction of the Y axis, and is fixed to other components such as a vehicle body, so that the power storage device 10 is fixed to the other component.

[0063] The end face connection portion 320 is the end portion of the end face component 300 on the positive side of the X-axis, is located on the positive side of the X-axis of the end face main body 310, and is extended in the Z-axis direction. Specifically, the end face connection portion 320 has a recessed portion 320a, which is a portion on the negative side of the Y-axis that is recessed toward the positive direction of the Y-axis. The recessed portion 320a is a recessed portion that extends in the Z-axis direction and is open on the negative side of the Y-axis and the positive side of the X-axis. Two circular hole portions 320b arranged in the Z-axis direction are formed in the wall portion of the recessed portion 320a that is parallel to the XZ plane on the positive side of the Y-axis. The hole portion 320b is a through hole formed with a female screw portion, which is used to screw with the male screw portion of the coupling component 400a.

[0064] The end surface connection portion 330 is an end portion on the negative X-axis direction side of the end surface component 300, and is arranged to extend in the Z-axis direction on the negative X-axis direction side of the end surface main body 310. Specifically, the end surface connection portion 330 is a side wall on the negative X-axis direction side of the end surface component 300, and two circular holes 330a arranged in the Z-axis direction are formed on the side wall. The hole 330a is a recessed portion formed with a female screw portion that is screwed with the male screw portion of the joint component 400a.

[0065] The end surface body portion 310 of the first end surface member 301 is referred to as a first end surface body portion 311, the end surface connection portion 320 of the first end surface member 301 is referred to as a first end surface connection portion 321, and the end surface connection portion 330 of the first end surface member 301 is referred to as a second end surface connection portion 331. The end surface body portion 310 of the second end surface member 302 is referred to as a second end surface body portion 312, the end surface connection portion 320 of the second end surface member 302 is referred to as a third end surface connection portion 322, and the end surface connection portion 330 of the second end surface member 302 is referred to as a fourth end surface connection portion 332. In other words, the first end surface member 301 includes the first end surface body portion 311, the first end surface connection portion 321, and the second end surface connection portion 331. The second end surface member 302 includes a second end surface main body portion 312 , a third end surface connecting portion 322 , and a fourth end surface connecting portion 332 .

[0066] [3.2 Description of the side member 400]

[0067] Next, the structure of the side member 400 (the first side member 401 and the second side member 402 ) will be described in detail. Figure 5 4 is a perspective view showing the structure of the side member 400 (the first side member 401 and the second side member 402) of this embodiment. Specifically, Figure 5 (a) shows Figure 2 4 is a perspective view of the structure of the first side member 401 in the embodiment, or the structure when the second side member 402 is rotated 180 degrees around the Z axis. Figure 5 (b) is viewed from the opposite side of the X-axis direction. Figure 5 (a) is a perspective view of the structure of the side member 400. The first side member 401 and the second side member 402 have the same structure when rotated 180 degrees around the Z axis, and therefore are shown in the same figure.

[0068] like Figure 5 As shown, the side member 400 includes a side body portion 410 , side connection portions 420 and 430 , and a pair of protruding portions 440 .

[0069] The side body portion 410 is a rectangular and flat plate-shaped portion constituting the main body of the side member 400. Specifically, the side body portion 410 is parallel to the YZ plane and extends in the Y-axis direction. A pair of protrusions 440 are portions that protrude from the ends of the side body portion 410 on the positive Z-axis side and the negative Z-axis side in the negative X-axis direction and extend in the Y-axis direction. With this structure, the pair of protrusions 440 are arranged at a position sandwiching the partition member 200 in the Z-axis direction, thereby limiting the movement of the storage element 100 and the partition member 200 in the Z-axis direction.

[0070] The side connection part 420 is an end of the side member 400 on the negative Y-axis direction side, and is configured to protrude from the edge of the side body part 410 on the negative Y-axis direction side toward the negative X-axis direction. Specifically, the side connection part 420 is a rectangular and flat plate-shaped portion that is parallel to the XZ plane and extends in the Z-axis direction. Two circular through holes 420a are formed in the side connection part 420, and the through holes 420a pass through the side connection part 420 in the Y-axis direction and are arranged in the Z-axis direction.

[0071] The side connection part 430 is an end part on the positive Y-axis direction side of the side member 400, and is extended from the edge of the side main body part 410 on the positive Y-axis direction side to the positive Y-axis direction side. In other words, the side connection part 430 is a part extending continuously from the side main body part 410 to the positive Y-axis direction side, and is a rectangular and flat plate-shaped part parallel to the YZ plane and extending in the Z-axis direction. Two circular through holes 430a are formed in the side connection part 430, and the through holes 430a pass through the side connection part 430 in the X-axis direction and are arranged in the Z-axis direction.

[0072] The side body portion 410 of the first side member 401 is referred to as a first side body portion 411, the side connection portion 420 of the first side member 401 is referred to as a first side connection portion 421, and the side connection portion 430 of the first side member 401 is referred to as a fourth side connection portion 431. The side body portion 410 of the second side member 402 is referred to as a second side body portion 412, the side connection portion 420 of the second side member 402 is referred to as a third side connection portion 422, and the side connection portion 430 of the second side member 402 is referred to as a second side connection portion 432. In other words, the first side member 401 includes the first side body portion 411, the first side connection portion 421, and the fourth side connection portion 431. The second side member 402 includes the second side body portion 412, the third side connection portion 422, and the second side connection portion 432.

[0073] [3.3 Description of the connection structure between the end surface member 300 and the side surface member 400]

[0074] Next, a structure in which the end surface member 300 and the side surface member 400 are connected will be described in detail. Figure 6 1 is a cross-sectional view showing a structure in which the end surface member 300 (the first end surface member 301 and the second end surface member 302) and the side surface member 400 (the first side surface member 401 and the second side surface member 402) are connected in this embodiment. Specifically, Figure 6 It means for Figure 11 is a cross-sectional view of the structure of the power storage device 10 cut along a plane parallel to the XY plane and including the VI-VI line, and shows the structure in a state where the power storage element 100 , the spacer member 200 , the end surface member 300 , and the side surface member 400 are assembled.

[0075] like Figure 6 As shown in the figure, the first end surface member 301 and the second end surface member 302 are arranged at positions sandwiching the plurality of energy storage elements 100 in the Y-axis direction (first direction). In other words, the first end surface member 301 and the second end surface member 302 are arranged at positions of a pair of long side surfaces 121 of the container 110 sandwiching the energy storage elements 100. In the present embodiment, the first end surface member 301 is arranged on the Y-axis negative direction side of the plurality of energy storage elements 100, and the second end surface member 302 is arranged on the Y-axis positive direction side of the plurality of energy storage elements 100.

[0076] The first side member 401 and the second side member 402 are arranged at positions sandwiching the plurality of energy storage elements 100 in the X-axis direction (a second direction intersecting the first direction). In other words, the first side member 401 and the second side member 402 are arranged at positions of a pair of short side portions 122 of the container 110 sandwiching the energy storage elements 100. In the present embodiment, the first side member 401 is arranged on the positive direction side of the plurality of energy storage elements 100 in the X-axis, and the second side member 402 is arranged on the negative direction side of the plurality of energy storage elements 100 in the X-axis.

[0077] With such a structure, the first end surface connection portion 321 of the first end surface component 301 is connected to the first side surface component 401. Specifically, the first end surface connection portion 321 is connected to the first side surface connection portion 421 of the first side surface component 401. More specifically, the first end surface connection portion 321 and the first side surface connection portion 421 overlap and are joined in the Y-axis direction (first direction). In other words, the first side surface connection portion 421 is arranged on the Y-axis negative direction side of the first end surface connection portion 321, overlaps and is joined.

[0078] In the present embodiment, the first end surface connection part 321 has a recessed portion 320a recessed in the Y-axis direction (first direction), and the first side surface connection part 421 is arranged in the recessed portion 320a and is joined to the first end surface connection part 321. Specifically, the joining member 400a is inserted into the through hole 420a of the first side surface connection part 421 and is screwed into the hole portion 320b of the first end surface connection part 321, so that the first end surface connection part 321 and the first side surface connection part 421 are joined (fixed). Therefore, the first side surface connection part 421 is arranged at a position that does not protrude from the surface on the Y-axis negative direction side of the first end surface main body 311 of the first end surface member 301 in the Y-axis negative direction. In the present embodiment, the joining member 400a is also arranged at a position that does not protrude from the surface on the Y-axis negative direction side of the first end surface main body 311 in the Y-axis negative direction.

[0079] The second end surface connection portion 331 of the first end surface component 301 is connected to the second side surface component 402. Specifically, the second end surface connection portion 331 is connected to the second side surface connection portion 432 of the second side surface component 402. More specifically, the second end surface connection portion 331 and the second side surface connection portion 432 overlap and are joined in the X-axis direction (second direction). In other words, the second side surface connection portion 432 is arranged on the X-axis negative direction side of the second end surface connection portion 331, overlaps and is joined.

[0080] In the present embodiment, the second end surface connection part 331 is a side wall of the first end surface part 301 in the X-axis direction (the second direction), and the second side surface connection part 432 overlaps and is joined to the side wall (the second end surface connection part 331) in the X-axis direction (the second direction). Specifically, the joining part 400a is inserted into the through hole 430a of the second side surface connection part 432 and is screwed into the hole part 330a of the second end surface connection part 331, so that the second end surface connection part 331 and the second side surface connection part 432 are joined (fixed). Therefore, the second side surface connection part 432 is arranged at a position that does not protrude from the surface of the second end surface connection part 331 on the negative direction side of the Y-axis to the negative direction of the Y-axis.

[0081] The third end surface connection portion 322 of the second end surface component 302 is connected to the second side surface component 402. Specifically, the third end surface connection portion 322 is connected to the third side surface connection portion 422 of the second side surface component 402. More specifically, the third end surface connection portion 322 and the third side surface connection portion 422 overlap and are joined in the Y-axis direction (first direction). In other words, the third side surface connection portion 422 is arranged on the Y-axis positive direction side of the third end surface connection portion 322, overlaps and is joined.

[0082] In the present embodiment, the third end surface connection part 322 has a recessed portion 320a recessed in the Y-axis direction (first direction), and the third side surface connection part 422 is arranged in the recessed portion 320a and is joined to the third end surface connection part 322. Specifically, the joining member 400a is inserted into the through hole 420a of the third side surface connection part 422 and is screwed into the hole portion 320b of the third end surface connection part 322, so that the third end surface connection part 322 and the third side surface connection part 422 are joined (fixed). Therefore, the third side surface connection part 422 is arranged at a position that does not protrude from the surface of the second end surface main body 312 of the second end surface part 302 on the Y-axis positive direction side to the Y-axis positive direction. In the present embodiment, the joining member 400a is also arranged at a position that does not protrude from the surface of the second end surface main body 312 on the Y-axis positive direction side to the Y-axis positive direction.

[0083] The fourth end surface connection portion 332 of the second end surface component 302 is connected to the first side surface component 401. Specifically, the fourth end surface connection portion 332 is connected to the fourth side surface connection portion 431 of the first side surface component 401. More specifically, the fourth end surface connection portion 332 and the fourth side surface connection portion 431 overlap and are joined in the X-axis direction (second direction). In other words, the fourth side surface connection portion 431 is arranged on the X-axis positive direction side of the fourth end surface connection portion 332, overlaps and is joined.

[0084] In the present embodiment, the fourth end surface connection part 332 is a side wall of the second end surface part 302 in the X-axis direction (the second direction), and the fourth side surface connection part 431 overlaps and is joined to the side wall (the fourth end surface connection part 332) in the X-axis direction (the second direction). Specifically, the joining part 400a is inserted into the through hole 430a of the fourth side surface connection part 431 and is screwed into the hole part 330a of the fourth end surface connection part 332, so that the fourth end surface connection part 332 and the fourth side surface connection part 431 are joined (fixed). Therefore, the fourth side surface connection part 431 is arranged at a position that does not protrude from the surface of the fourth end surface connection part 332 on the positive direction side of the Y-axis to the positive direction of the Y-axis.

[0085] [4. Description of the Effect]

[0086] As described above, according to the power storage device 10 of the present embodiment, the first end surface connection portion 321 of the first end surface member 301 and the first side surface connection portion 421 of the first side surface member 401 overlap and are joined in the first direction (Y-axis direction). The second end surface connection portion 331 of the first end surface member 301 and the second side surface connection portion 432 of the second side surface member 402 overlap and are joined in the second direction (X-axis direction). In this way, the first end surface member 301 and the first side surface member 401 are joined in the first direction, and the first end surface member 301 and the second side surface member 402 are joined in the second direction, so that the first end surface member 301 is joined in different directions, namely, the first direction and the second direction. Thus, the power storage element 100 can be restrained in the first direction, and the restraining force can be suppressed from being concentrated on both ends of the power storage element 100 on the side of the side member 400, thereby suppressing the bias of the restraining force on the power storage element 100.

[0087] The third end surface connection portion 322 of the second end surface component 302 and the third side surface connection portion 422 of the second side surface component 402 overlap and are joined in the first direction. In this way, the second end surface component 302 is joined to the second side surface component 402 in the first direction, and the second side surface component 402 joined to the first end surface component 301 in the second direction is joined to the second end surface component 302 in the first direction. Thus, the restraining force of the energy storage element 100 in the first direction can be increased, and the bias of the restraining force on the energy storage element 100 can be suppressed.

[0088] When the two ends of the second side surface component 402 are joined to the two end surface components 300 in the first direction, it is difficult to absorb the tolerance in the first direction. Therefore, the second side surface component 402 is joined to the first end surface component 301 in the second direction, so that the tolerance in the first direction can be easily absorbed.

[0089] The fourth end surface connection portion 332 of the second end surface component 302 and the fourth side surface connection portion 431 of the first side surface component 401 overlap and are joined in the second direction. In this way, by joining the second end surface component 302 and the first side surface component 401 in the second direction, both of the two end surface components 300 are joined to the two side surface components 400 in different directions, namely the first direction and the second direction, and both of the two side surface components 400 are joined to the two end surface components 300 in the different directions. Therefore, the two end surface components 300 and the two side surface components 400 restrain the energy storage element 100 in a balanced manner, and the bias of the restraining force on the energy storage element 100 can be suppressed.

[0090] Furthermore, since the two end surface members 300 and the two side surface members 400 can be formed into the same shape, the two end surface members 300 and the two side surface members 400 can be made common.

[0091] The first side surface connection portion 421 of the first side surface member 401 is arranged in the recessed portion 320a of the first end surface connection portion 321 of the first end surface member 301, which is recessed in the first direction, and is joined to the first end surface connection portion 321. Thus, when the first side surface connection portion 421 is joined to the first end surface connection portion 321, it is arranged in the recessed portion 320a of the first end surface connection portion 321, so that the first side surface connection portion 421 can be suppressed from protruding from the first end surface connection portion 321 in the first direction. Therefore, it is possible to suppress the first side surface member 401 from protruding from the first end surface member 301 in the first direction, thereby saving space and suppressing the bias of the restraining force on the energy storage element 100. The same is true for the third end surface connection portion 322 of the second end surface member 302 and the third side surface connection portion 422 of the second side surface member 402.

[0092] The second side connection portion 432 of the second side member 402 overlaps and is joined to the side wall in the second direction of the second end surface connection portion 331 of the first end surface member 301. In this way, the second side connection portion 432 overlaps and is joined to the side wall of the first end surface member 301 in the second direction, thereby preventing the second side connection portion 432 from protruding from the first end surface member 301 in the first direction. Therefore, it is possible to prevent the second side member 402 from protruding from the first end surface member 301 in the first direction, thereby saving space and preventing the bias of the restraining force on the energy storage element 100. The same is true for the fourth end surface connection portion 332 of the second end surface member 302 and the fourth side connection portion 431 of the first side member 401.

[0093] [5. Description of Modifications]

[0094] The above describes the power storage device 10 according to the embodiment of the present invention, but the present invention is not limited to this embodiment. In other words, all the contents of the embodiment disclosed this time are illustrative and not restrictive, and the scope of the present invention includes all changes within the scope of the equivalent meaning and the equivalent scope of the technical solution.

[0095] In the above embodiment, the third end surface connection portion 322 of the second end surface member 302 and the third side surface connection portion 422 of the second side surface member 402 overlap and are joined in the first direction. However, the third end surface connection portion 322 and the third side surface connection portion 422 may overlap and be joined in the second direction.

[0096] In the above embodiment, the fourth end surface connection portion 332 of the second end surface component 302 and the fourth side surface connection portion 431 of the first side surface component 401 overlap and are joined in the second direction. However, the fourth end surface connection portion 332 and the fourth side surface connection portion 431 may overlap and be joined in the first direction.

[0097] In the above-described embodiment, the first end surface connection portion 321 of the first end surface member 301 has the recessed portion 320a recessed in the first direction, and the first side surface connection portion 421 of the first side surface member 401 is disposed in the recessed portion 320a and joined to the first end surface connection portion 321. However, the first end surface connection portion 321 may be joined to the first side surface connection portion 421 without having the recessed portion 320a. The same is true for the third end surface connection portion 322 of the second end surface member 302 and the third side surface connection portion 422 of the second side surface member 402.

[0098] In the above-described embodiment, the second end surface connection portion 331 of the first end surface component 301 is a side wall of the first end surface component 301 in the second direction, and the second side surface connection portion 432 of the second side surface component 402 overlaps and is joined to the side wall in the second direction. However, the second end surface connection portion 331 may be a protrusion protruding from the first end surface main body portion 311 in the Y-axis direction, and the second side surface connection portion 432 overlaps and is joined to the protrusion in the second direction. The same is true for the fourth end surface connection portion 332 of the second end surface component 302 and the fourth side surface connection portion 431 of the first side surface component 401.

[0099] In the above-described embodiment, the first end surface component 301 and the second end surface component 302 have the same shape, and the first side surface component 401 and the second side surface component 402 have the same shape. However, the first end surface component 301 and the second end surface component 302 may have different shapes, and the first side surface component 401 and the second side surface component 402 may also have different shapes.

[0100] In the above-described embodiment, the end face component 300 and the side face component 400 are joined by bolts of the joint component 400a. However, the joining of the end face component 300 and the side face component 400 is not limited to bolts, but may be rivet fastening, riveting, fitting, clamping, welding, adhesive or double-sided tape.

[0101] In the above-described embodiment, the power storage device 10 does not need to include Figure 2 The power storage device 10 may not include the partition member 200 , the bus bar holding member 500 , or the substrate 700 .

[0102] Any configuration obtained by arbitrarily combining the constituent elements of the above-described embodiment and the above-described modifications is also included in the scope of the present invention.

[0103] The present invention can be implemented not only as such an electric storage device 10 but also as the end surface member 300 and the side surface member 400 included in the electric storage device 10 .

[0104] The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery, and the like.

[0105] Explanation of symbols

[0106] 10 Power storage device

[0107] 100 Storage Components

[0108] 110 Container

[0109] 120 Container body

[0110] 121 Long side face

[0111] 122 Short side face

[0112] 123 bottom part

[0113] 130 Cover

[0114] 131 Gas release valve

[0115] 132 Liquid injection part

[0116] 140 Electrode terminal

[0117] 150 Gasket

[0118] 200 Separator

[0119] 300 End face parts

[0120] 301 1st end face component

[0121] 302 Second end face component

[0122] 310 end face body

[0123] 310a, 320a recess

[0124] 311 1st end surface main body

[0125] 312 Second end surface main body

[0126] 320, 330 end connection

[0127] 320b, 330a hole portion

[0128] 321 1st end connection part

[0129] 322 3rd end connection part

[0130] 331 Second end connection part

[0131] 332 4th end connection

[0132] 340 Fixed part

[0133] 400 Side parts

[0134] 400a Joint parts

[0135] 401 1st side member

[0136] 402 2nd side member

[0137] 410 side body

[0138] 411 1st side body

[0139] 412 Second side body

[0140] 420, 430 Side connection

[0141] 420a, 430a through hole

[0142] 421 1st side connection part

[0143] 422 3rd side connection

[0144] 431 4th side connection

[0145] 432 Second side connection

[0146] 440 Protrusion

[0147] 500 Busbar Retention Components

[0148] 600 Busbar

[0149] 610 external terminal

[0150] 700 substrate

[0151] 710 Wiring

Claims

1. An electric storage device, The power storage device comprises: A plurality of power storage elements are arranged in a first direction; a first end surface member and a second end surface member disposed at positions sandwiching the plurality of power storage elements in the first direction; and The first side member and the second side member are arranged at positions sandwiching the plurality of power storage elements in a second direction, the second direction being a direction intersecting the first direction, and the first side member and the second side member are independent members from each other. The first end surface member has a first end surface connection portion connected to the first side surface member and a second end surface connection portion connected to the second side surface member. The first side surface member has a first side surface connection portion connected to the first end surface connection portion. The second side surface member has a second side surface connecting portion connected to the second end surface connecting portion. The first end surface connection portion and the first side surface connection portion overlap in the first direction, and are joined in the first direction by a joining member at the overlapping portion. The second end surface connection portion and the second side surface connection portion overlap in the second direction, and are joined in the second direction by a joining member at the overlapping portion.

2. The power storage device according to claim 1, The second end surface member has a third end surface connection portion connected to the second side surface member. The second side surface member has a third side surface connection portion connected to the third end surface connection portion. The third end surface connection portion and the third side surface connection portion overlap and are joined in the first direction.

3. The power storage device according to claim 2, The second end surface member has a fourth end surface connection portion connected to the first side surface member. The first side member has a fourth side connection portion connected to the fourth end surface connection portion. The fourth end surface connecting portion and the fourth side surface connecting portion overlap and are joined in the second direction.

4. The power storage device according to any one of claims 1 to 3, The first end surface connecting portion has a recessed portion recessed in the first direction, The first side surface connection portion is disposed in the recessed portion and is joined to the first end surface connection portion.

5. The power storage device according to any one of claims 1 to 3, The second end surface connection portion is a side wall of the first end surface member in the second direction. The second side surface connecting portion and the side wall overlap and are joined in the second direction.

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