JP2019110097A - Power storage device - Google Patents

Abstract

To provide a power storage device that is able to hinder damage to an end plate.SOLUTION: A power storage device comprises: one or more power storage elements 100; an end plate 200a disposed in a first direction of an end power storage element 100a disposed at an end, in the first direction, of the one or more power storage elements 100; fixing parts 500 for fixing the end plate 200a to an external member 400, the fixing parts being two fixing parts 500 arranged side by side in a second direction intersecting the first direction. Between the end power storage element 100a and the end plate 200a is a space disposed between the two fixing parts 500 in the second direction, the space being continuously formed from at least one end of an area to a central part of the area where, as viewed from the first direction, the end power storage element 100a and the end plate 200a overlap in a third direction intersecting the first and second directions.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage device provided with one or more power storage elements and an end plate.

  2. Description of the Related Art Conventionally, there is widely known a power storage device that includes one or more power storage elements and an end plate, and is configured to sandwich the power storage element between the end plates to suppress expansion of the power storage element. For example, Patent Document 1 discloses a power supply device (power storage device) having a configuration in which a plurality of secondary battery cells (power storage elements) are sandwiched between two end plates.

JP, 2015-111493, A

  However, in the above-mentioned conventional power storage device, when suppressing the swelling of the power storage element, an excessive force is applied to the end plate, which may damage the end plate.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power storage device capable of suppressing damage to an end plate.

  In order to achieve the above object, a power storage device according to an aspect of the present invention includes one or more power storage elements, and the end power storage element disposed at an end of the one or more power storage elements on the first direction side. It comprises: an end plate disposed in the first direction side; and a fixing portion for fixing the end plate to an external member, the two fixing portions being aligned in a second direction intersecting the first direction; A space which is disposed between the end storage element and the end plate, and which is a space disposed between the two fixed parts in the second direction, and which intersects the first direction and the second direction. In the above, a continuous space is formed from at least one end of a region where the end portion storage element and the end plate overlap with each other when viewed from the first direction.

  According to this, in the power storage device, there is a space disposed between the two fixed portions that fix the end plate to the external member between the end charge storage element disposed at the end and the end plate. A continuous space is formed from at least one end to the central portion of the overlapping region of the end storage element and the end plate. Here, the portion of the end plate fixed to the outside is a portion that is strong against the force from the end storage element. For this reason, a space is formed between the two fixing portions that fix the end plate to the outside, and the force from the end storage element is received near the two fixing portions. Further, since the space is a space continuous from at least one end to the central portion of the region where the end plate faces the end charge storage device, the force from the end charge storage device is most received from the one end The force received from the end storage element can be avoided until the central portion is considered. As described above, the end plate can be prevented from being damaged by receiving the force from the end energy storage device at the strong portion while avoiding the force from the end energy storage device at the portion where the end plate is easily damaged. .

  In addition, the end plate has two first protrusions that protrude toward the end portion of the electric storage element and are aligned in the second direction, and each of the two first protrusions is viewed from the first direction. And the space is formed continuously between the two first protrusions and is disposed at a position overlapping with each of the fixing regions fixed to the two fixing portions of the end plate. It may be possible to have one space.

  According to this, in the power storage device, the end plate has the two first protrusions protruding toward the end power storage element, and the two first protrusions are fixed to the two fixing portions. It arrange | positions in the position which overlaps with a fixed area | region, and the 1st space is continuously formed between the said two 1st protrusion parts. As described above, since the end plate has the two first protrusions projecting toward the end charge storage device, the first plate can be easily formed between the two fixing portions if the end plate is disposed. Can. Thereby, since the force from the end storage element can be received in the vicinity of the two fixing portions, damage to the end plate can be suppressed.

  Furthermore, a spacer disposed between the end plate and the end storage element is provided, and the spacer protrudes toward at least one of the end storage element and the end plate, in the second direction. Each of the two second protrusions has two second protrusions juxtaposed, and each of the two second protrusions is a fixing region fixed to the two fixing portions of the end plate as viewed from the first direction. And the space may have a second space formed continuously between the two second protrusions.

  According to this, the power storage device includes the spacer having the two second protrusions protruding toward at least one of the end charge storage device and the end plate, and the two second protrusions are the two fixing portions. It arrange | positions in the position which overlaps with the fixed area | region which is being fixed, and the 2nd space is continuously formed between the said 2nd 2nd protrusion part. As described above, since the spacer has two protrusions projecting toward at least one of the end energy storage device and the end plate, the second space is easily formed between the two fixing portions if the spacer is disposed. can do. Thereby, since the force from the end storage element can be received in the vicinity of the two fixing portions, damage to the end plate can be suppressed.

  The fixing area may be an area formed by extending the maximum width of the fixing portion in the second direction in the second direction in the end plate.

  According to this, in the power storage device, the fixed region is a region formed by extending the maximum width of the fixed portion of the end plate. That is, since the area obtained by extending the maximum width of the fixing part up and down is the part to which the fixing part applies a fixing force, this area is made a fixing area, and the projecting part is disposed at a position overlapping the fixing area. Do. Thereby, since the force from the end charge storage device can be received by the protrusion, damage to the end plate can be suppressed.

  Further, the space does not overlap with the joint portion formed in the container of the end portion storage device as viewed from the first direction in the region from one end to the other end of the end plate in the third direction. It may be a continuous space formed at a position.

  According to this, in the power storage device, the space to be formed is continuously formed at a position not overlapping the junction formed on the container of the end power storage element in the region from one end to the other end of the end plate Space. Here, in order to suppress damage to the bonding portion, it is preferable to press the bonding portion with an end plate, and therefore, it is preferable not to form a space at a position facing the bonding portion. For this reason, damage to the end plate can be suppressed while suppressing damage to the joint by forming a space continuously at a position other than the joint from one end to the other end of the end plate. .

  The present invention can not only be realized as such a power storage device, but also can be realized as an end plate or a spacer provided in the power storage device.

  According to the power storage device of the present invention, damage to the end plate can be suppressed.

FIG. 1 is a perspective view showing an appearance of a power storage device according to an embodiment. It is a perspective view which shows the external appearance of the electrical storage element which concerns on embodiment. It is a perspective view which shows the structure of the end plate which concerns on embodiment. It is a side view showing the composition in the state where the end plate concerning an embodiment was attached to an electrical storage element. It is the top view and front view which show the structure in the state in which the end plate which concerns on embodiment was attached to the electrical storage element. It is a perspective view showing the composition of the end plate concerning the modification 1 of an embodiment, and a spacer. It is a top view which shows the structure in the state in which the end plate and spacer which concern on the modification 1 of embodiment were attached to the edge part electrical storage element. It is a top view which shows the structure in the state in which the end plate which concerns on the other example of modification 1 of embodiment, and the spacer were attached to the edge part electrical storage element. It is a perspective view which shows the structure of the end plate which concerns on the modification 2 of embodiment.

  Hereinafter, a power storage device according to an embodiment (and its modification) of the present invention will be described with reference to the drawings. The embodiment described below shows a comprehensive or specific example. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, and the like described in the following embodiments are merely examples, and are not intended to limit the present invention. Further, among the components in the following embodiments, components not described in the independent claim indicating the highest concept are described as arbitrary components. Further, each drawing is a schematic view, and the dimensions and the like are not necessarily illustrated exactly. Furthermore, in each of the drawings, the same or similar components are denoted by the same reference numerals.

  In the following description and drawings, the direction in which the electrode terminals (that is, the positive electrode terminal and the negative electrode terminal) in one storage element are aligned or the opposing direction of the short side of the storage element container is defined as the X-axis direction. Further, the direction in which the storage elements are arranged, the direction in which the end plates are arranged, the opposing direction of the long side of the container of the storage elements, the thickness direction of the containers, or the thickness direction of the end plates is defined as the Y-axis direction. Further, the direction in which the container body and the lid of the storage element are aligned, the longitudinal direction of the short side of the storage cell container, or the vertical direction is defined as the Z axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are directions intersecting with each other (orthogonal in the present embodiment). Although it may be considered that the Z-axis direction is not in the vertical direction depending on the mode of use, the Z-axis direction is hereinafter described as the vertical direction for the convenience of description. Further, in the following description, for example, the X axis direction plus side indicates the arrow direction side of the X axis, and the X axis direction minus side indicates the opposite side to the X axis direction plus side. The same applies to the Y-axis direction and the Z-axis direction.

Embodiment
[1. General Description of Power Storage Device 10]
First, general description of power storage device 10 in the present embodiment will be made. FIG. 1 is a perspective view showing an appearance of power storage device 10 according to the present embodiment.

  Power storage device 10 is a device capable of charging electricity from the outside and discharging electricity to the outside. For example, the power storage device 10 is a battery module (assembled battery) used for a power storage application, a power supply application, and the like. Specifically, the storage device 10 is, for example, a car such as an electric car (EV), a hybrid electric car (HEV) or a plug-in hybrid electric car (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, a construction It is used as a battery for driving a moving body such as a machine or for starting an engine.

  As shown in FIG. 1, the storage device 10 includes a plurality of storage devices 100 (five storage devices 100 in the present embodiment), two end plates 200 (end plates 200 a and 200 b), and storage devices 100. And a restraining member 300 for restraining. Power storage device 10 includes a bus bar electrically connecting power storage elements 100, a spacer disposed between power storage elements 100, an exterior body disposed outside power storage element 100, and a bus bar frame for positioning the bus bars. An insulating member that insulates the storage element 100 and the restraint member 300, a circuit board for monitoring the charge state or discharge state of the storage element 100, and an electrical device such as a relay may also be provided, but these are not shown. And a detailed explanation is also omitted.

  Storage element 100 is a secondary battery (unit cell) capable of charging and discharging electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery . Storage element 100 has a flat rectangular parallelepiped (square) shape, and in the present embodiment, five storage elements 100 are arranged in the Y-axis direction. Here, the storage element 100 disposed at the end of the plus side (hereinafter also referred to as the first direction side) in the Y-axis direction is also referred to as an end storage element 100 a. Further, the storage element 100 disposed at the end on the negative side in the Y-axis direction is also referred to as an end storage element 100b. Further, the three storage elements 100 disposed between the end storage element 100a and the end storage element 100b are also referred to as an intermediate storage element 100c.

  Note that the number of storage elements 100 is not limited to five, and may be one or a plurality other than five. When the number of storage elements 100 is one or two, the one or two storage elements 100 can be referred to as an end storage element. When the number of storage elements 100 is three or more, the storage elements 100 at both ends can be referred to as end storage elements, and the storage elements 100 in between can be referred to as intermediate storage elements.

  Further, the connection form of the storage element 100 is not particularly limited, and all may be connected in series, or any storage element 100 may be connected in parallel. In addition, although the rectangular parallelepiped (square) storage element 100 is illustrated in the present embodiment, the shape of the storage element 100 is not limited to a rectangular parallelepiped, and may be a long cylinder, a cylinder, or the like. It is also possible to use a laminate type storage element. Further, the storage element 100 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a capacitor. Further, the storage element 100 may not be a secondary battery, but may be a primary battery that can use the stored electricity without charging by the user. The detailed description of the configuration of the storage element 100 will be described later.

  The end plate 200 and the restraint member 300 are members that press the storage element 100 from the outside in the direction in which the plurality of storage elements 100 are arranged (Y-axis direction). That is, the end plate 200 and the restraint member 300 press the storage elements 100 included in the plurality of storage elements 100 from both sides by sandwiching the plurality of storage elements 100 from both sides in the arranging direction.

  Specifically, the end plate 200 is a flat member (sandwich member) disposed on both sides of the plurality of storage devices 100 in the Y-axis direction, and the plurality of storage devices 100 are arranged in the arrangement direction of the plurality of storage devices 100. Hold it from both sides (in the Y-axis direction). The end plate 200 is formed of, for example, a metal (conductive) member such as steel or stainless steel from the viewpoint of strength and the like, but is not limited thereto. For example, the end plate 200 is formed of a high strength insulating member May be When end plate 200 is formed of a conductive member such as metal, end plate 200 is subjected to an insulation treatment, or between end plate 200 and storage element 100 from the viewpoint of corrosion prevention and the like. An insulating member may be arranged.

  Here, the end plate 200 disposed on the Y axis direction plus side (the first direction side) of the end portion power storage device 100a is also referred to as an end plate 200a. Further, the end plate 200 disposed on the negative side in the Y-axis direction of the end storage element 100b is also referred to as an end plate 200b. A detailed description of the configuration of the end plate 200 (end plate 200a, end plate 200b) will be described later.

  The restraint member 300 is a long and flat plate-like member (a restraint bar) which is attached to the end plate 200 at both ends and restrains the plurality of storage elements 100. That is, the constraining member 300 is disposed so as to straddle the plurality of storage elements 100, and applies a restraint force in the direction in which the plurality of storage elements 100 are arranged (in the Y-axis direction).

  In the present embodiment, two restraint members 300 are arranged on both sides of the plurality of storage elements 100 in the X-axis direction, and each of the two restraint members 300 has two ends at both ends in the Y-axis direction. It is attached to the end of the plate 200 in the X-axis direction. Thus, the two restraint members 300 sandwich and restrain the plurality of storage elements 100 from both sides in the X-axis direction and both sides in the Y-axis direction. The attachment of the restraint member 300 to the end plate 200 is fixed by the bolt 310, but is not limited to the fixation by the bolt 310, and may be fixed by welding, adhesion or the like. Further, like the end plate 200, the restraint member 300 is preferably formed of a metal member such as steel or stainless steel, but may be formed of a member other than metal.

  Power storage device 10 is mounted on external member 400 disposed outside power storage device 10 and fixed by fixing portion 500. The external member 400 is, for example, a car body of a vehicle on which the power storage device 10 is mounted, a cooling device for cooling (for example, water cooling) the power storage device 10, or an exterior body of equipment for mounting the power storage device 10. The fixing portion 500 is a member for fixing the end plate 200 to the external member 400, and two fixing portions 500 are arranged side by side in the X-axis direction (hereinafter also referred to as a second direction). In the present embodiment, fixing portion 500 is a bolt that penetrates end plate 200 and is joined to external member 400.

  That is, fixing unit 500 is inserted into a through hole (a through hole 211 described later) formed in end plate 200 and extending in the Z-axis direction, and end plate 200 is fixed to external member 400, whereby power storage device 10 is obtained. Are fixed to the outer member 400. Fixing part 500 is not limited to a bolt. For example, the fixing portion 500 may be a rod-like member, and the rod-like member may be inserted into the through hole 211, and the rod-like member, the end plate 200, and the external member 400 may be joined by welding or the like.

[2 Detailed Description of Power Storage Element 100]
Next, the configuration of the storage element 100 (the end storage elements 100a and 100b and the intermediate storage element 100c) will be described in detail. End portion storage elements 100a and 100b and middle section storage element 100c all have the same configuration, and therefore, will be described as storage element 100 below. FIG. 2 is a perspective view showing the appearance of the storage element 100 according to the present embodiment.

  As shown in FIG. 2, the storage element 100 includes a container 110 and two electrode terminals 120 (a positive electrode terminal and a negative electrode terminal). In the inside of the container 110, an electrode body, a current collector (positive electrode current collector and negative electrode current collector), an electrolytic solution (non-aqueous electrolyte), and the like are accommodated, but these are not shown. . In addition, as the said electrolyte solution, if it does not impair the performance of the electrical storage element 100, there will be no restriction | limiting in particular in the kind, A various thing can be selected.

  The container 110 is a rectangular parallelepiped (square-shaped) container having a container body 111 having an opening formed therein and a lid 112 for closing the opening of the container body 111. The container main body 111 is a member having a rectangular cylindrical shape and a bottom that constitutes the main body of the container 110, and includes two long side portions on the side surfaces on both sides in the Y-axis direction and two short side surface portions on the side surfaces on both sides in the X-axis direction, And it has a bottom part in the Z axis direction minus side. The lid 112 is a rectangular plate-like member that constitutes the lid of the container 110, and is disposed on the positive side in the Z-axis direction of the container body 111.

  Specifically, after the electrode body or the like is accommodated inside the container body 111, the container 110 is joined by welding or the like between the container body 111 and the lid 112 to form the joint portion 113, so that the inside is made It has a sealed structure. That is, on the side surfaces of the container 110 (surfaces on both sides in the X-axis direction and on both sides in the Y-axis direction), joint portions 113 in which the container body 111 and the lid 112 are joined are formed. The material of the container 110 (the container body 111 and the lid 112) is not particularly limited, but is preferably a weldable (joinable) metal such as stainless steel, aluminum, an aluminum alloy, iron, or a plated steel plate. Further, the lid 112 is provided with a gas discharge valve for releasing the pressure when the pressure in the container 110 is increased, a liquid injection part for injecting the electrolytic solution, etc. The description is omitted.

  The electrode terminal 120 is a terminal (a positive electrode terminal and a negative electrode terminal) electrically connected to the positive electrode plate and the negative electrode plate of the electrode body through the current collector. That is, the electrode terminal 120 leads the electricity stored in the electrode body to the external space of the storage element 100, and the metal for introducing the electricity into the internal space of the storage element 100 to store the electricity in the electrode body. It is a member made of The electrode terminal 120 is formed of aluminum or an aluminum alloy.

  The electrode body is a storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. Here, the positive electrode plate of the electrode body is obtained by forming a positive electrode active material layer on a positive electrode base material layer which is a long strip-like current collector foil made of metal such as aluminum or aluminum alloy. Further, the negative electrode plate is obtained by forming a negative electrode active material layer on a negative electrode base material layer which is a long strip-like current collector foil made of metal such as copper or copper alloy. Further, as a positive electrode active material used for the positive electrode active material layer and a negative electrode active material used for the negative electrode active material layer, known materials can be appropriately used as long as they can occlude and release lithium ions. The current collector is a member (a positive electrode current collector and a negative electrode current collector) provided with conductivity and rigidity electrically connected to the electrode terminal 120 and the electrode body. The positive electrode current collector is formed of aluminum or aluminum alloy as in the case of the positive electrode base layer of the positive electrode plate, and the negative electrode current collector is formed of copper or copper alloy as in the case of the negative electrode base layer of the negative electrode plate. It is done.

[Description of Configuration of End Plate 200]
Next, the configuration of the end plate 200 (end plates 200a and 200b) will be described in detail. FIG. 3 is a perspective view showing the configuration of the end plate 200 according to the present embodiment. Although the end plate 200 a is illustrated as the end plate 200 in the same drawing, the end plate 200 b has the same configuration as that of the end plate 200 a rotated 180 ° around the Z axis, so the end plate 200 b is illustrated. Is omitted.

  As shown in the figure, the end plate 200 includes a plate body 210, two first protrusions 220 aligned in the X-axis direction (second direction), and an end protrusion 230 disposed at the upper end. Have. The plate main body portion 210 is a rectangular and flat portion parallel to the XZ plane constituting the main body portion of the end plate 200. Further, in the plate main body portion 210, two circular through holes 211 in a top view are formed at both end portions in the X-axis direction. As described above, the through hole 211 is a hole into which the fixing portion 500 is inserted, and the fixing portion 500 inserted into the through hole 211 is joined to the external member 400, so that the plate body portion 210 is the external member 400. It is fixed to

  The first projecting portion 220 is a rectangular and flat plate-like portion protruding from both end portions in the X-axis direction of the plate main body portion 210 in the negative Y-axis direction, and is formed extending in the Z-axis direction. That is, the first projecting portion 220 is disposed to project from both end portions of the side surface on the negative side in the Y axis direction of the plate main body portion 210, from the lower end edge of the end projecting portion 230 to the lower end edge of the plate main body portion 210. It is disposed extending in the Z-axis direction. In addition, the first protrusion 220 is disposed at a position corresponding to the through hole 211, that is, at a position on the Y axis direction minus side of the through hole 211. In other words, the first protrusion 220 is disposed at a position overlapping the through hole 211 when viewed from the Y-axis direction.

  The end projecting portion 230 is a rectangular and flat portion projecting from the end on the positive side in the Z-axis direction of the plate main body portion 210 in the negative side in the Y-axis direction, and is formed extending in the X-axis direction There is. That is, the end projecting portion 230 is disposed to project from the upper end of the side surface on the negative side in the Y-axis direction of the plate main body portion 210, and from the end edge on the positive side in the X-axis direction of the plate main body 210 It is disposed extending in the X-axis direction over the side edge. The end protrusion 230 has a protrusion height equivalent to that of the first protrusion 220, and the surface on the negative side in the Y-axis direction is continuous with the first protrusion 220 without any step. .

[4 Description of mounting configuration of end plate 200]
Next, the configuration in the state where end plate 200 is attached to storage element 100 will be described in detail. FIG. 4 is a side view showing a configuration in which end plate 200 according to the present embodiment is attached to storage element 100. As shown in FIG. Specifically, FIG. 4 is a view of power storage device 10 shown in FIG. 1 as viewed from the plus side in the X-axis direction. In FIG. 4, for the convenience of description, the constraining member 300 is omitted.

  FIG. 5 is a top view and a front view showing a configuration in a state where end plate 200 according to the present embodiment is attached to power storage element 100. Specifically, (a) of FIG. 5 is a view of the end portion power storage device 100a and the end plate 200a of the power storage device 10 shown in FIG. 4 as viewed from the positive side in the Z-axis direction. (B) is a figure when the structure of (a) of FIG. 5 is seen from the Y-axis direction plus side. In FIG. 5B, the electrode terminal 120 of the end portion power storage element 100a is omitted for the convenience of description.

  As shown in FIG. 4, the end plate 200 a and the end plate 200 b are disposed so as to sandwich the end energy storage device 100 a, the three middle energy storage devices 100 c, and the end energy storage device 100 b. Specifically, the end plate 200a is disposed such that the two first protrusions 220 and the end protrusions 230 protrude toward the end power storage device 100a and abut on the container 110 of the end power storage device 100a. Be done. Specifically, the two first protrusions 220 are disposed in contact with both sides in the X-axis direction of the long side surface portion of the container 110 of the end portion energy storage device 100a. Further, the end projecting portion 230 is disposed at a position facing the joint portion 113 between the container body 111 of the container 110 and the lid 112, and the joint portion 113 is in contact with the joint portion 113. It is arranged in contact.

  The same applies to the positional relationship between the end charge storage device 100b and the end plate 200b. Since the configuration on the end plate 200 a side and the configuration on the end plate 200 b side have the same configuration as described above, the configuration on the end plate 200 a side will be described in detail below. The description of the configuration on the side is omitted.

  Here, as described above, a space is formed between the end charge storage device 100a and the end plate 200a by the two first protrusions 220 and the end protrusion 230 being in contact with the end charge storage device 100a. Be done. This space will be described in detail below.

  As shown in FIG. 5A, a first space S1 and a side space S2 disposed on both sides of the first space S1 are formed between the end charge storage device 100a and the end plate 200a. Be done. The first space S1 is a space disposed between the two fixing portions 500 in the second direction (X-axis direction). That is, the first space S1 is disposed between the two first protrusions 220 and continuously between the two first protrusions 220 without interruption between the two first protrusions 220. It is a space formed. Further, the side space S2 is a space disposed on the X axis direction plus side of the first protrusion 220 on the X axis direction plus side, and on the X axis direction minus side of the first protrusion 220 on the X axis direction minus side. It is.

  Further, as shown in (b) of FIG. 5, the first space S1 is formed in the third direction (Z-axis direction) intersecting the first direction (Y-axis direction) and the second direction (X-axis direction). This space is continuous from at least one end to the central portion of a region (region R1 in the same figure) in which the end charge storage device 100a and the end plate 200a overlap when viewed from one direction. Here, since end storage element 100a and end plate 200a have substantially the same size when viewed from the first direction (Y-axis direction), "end storage element 100a viewed from the first direction A region where the end plate 200a overlaps with the end plate 200a (region R1) is a rectangular region surrounded by the outer edge of the end plate 200a. That is, the first space S1 is a space which is continuous from one end of the end plate 200a to the central portion in the Z-axis direction when viewed from the Y-axis direction.

  In the present embodiment, the first space S1 is a continuous space from the lower end of the end plate 200a to the lower end of the end projecting portion 230, that is, in the region from one end to the other end of the end plate 200a in the Z-axis direction. This is a space excluding the end protrusion 230. Here, as described above, the end protrusion 230 is a portion that abuts on the bonding portion 113 formed in the container 110 of the end power storage device 100a. For this reason, in the third space (the Z-axis direction), the first space S1 is the end portion power storage device 100a as viewed from the first direction (the Y-axis direction) in the region from one end to the other end of the end plate 200a. The continuous space is formed at a position not overlapping with the joint portion 113 formed in the container 110 of FIG.

  The first space S1 may be a space which is continuous from one end of the region R1 to the central portion. For example, the first space S1 may be a space which is continuous from the upper end to the central portion of the end plate 200a. . When end storage element 100a is smaller than end plate 200a when viewed from the Y-axis direction, the above-mentioned region R1 is a region surrounded by the outer edge of end storage element 100a. In this case, the first space S1 may not extend to the lower end or the upper end of the end plate 200a, and may extend to one end (the lower end or the upper end) of the region R1.

  Here, although the first space S1 is disposed between the two first protrusions 220, the arrangement position of the two first protrusions 220 will be described in detail. As shown in (b) of FIG. 5, each of the two first protrusions 220 is fixed to two fixing portions 500 of the end plate 200 a when viewed from the first direction (Y-axis direction). It is arrange | positioned in the position which overlaps with each of fixed area | region R2. Here, the fixing area R2 is an area formed by extending the maximum width of the fixing portion 500 in the second direction (X-axis direction) of the end plate 200a in the third direction (Z-axis direction). .

  That is, in the present embodiment, since fixing portion 500 is a bolt, the head portion of the bolt has a width larger than that of the shaft portion in the X-axis direction, and has the largest width of fixing portion 500. . Then, when the end plate 200a is fixed by the fixing portion 500, the end plate 200a is pressed against the head of the bolt, so that a fixing force is applied to the end plate 200a in the region of the width of the head of the bolt. As described above, since the fixing area R2, which is an area corresponding to the width of the head of the bolt, is a strong portion of the end plate 200a, the first projection 220 is disposed at a position overlapping the fixing area R2. In the present embodiment, the first projecting portion 220 is disposed so as to include the entire fixing region R2 when viewed from the Y-axis direction, but the first projecting portion 220 may include X only so as to include only a part of the fixing region R2. It may be disposed offset to the axial positive side or negative side.

  Further, in the side space S2, similarly to the first space S1, in the Z-axis direction, a space continuous from at least one end to the central portion of the region R1; that is, from one end to the other end of the end plate 200a The continuous space is formed at a position not overlapping with the joint portion 113 in the area of. In addition, the shape of side space S2 may be a shape different from the above, and side space S2 does not need to be formed.

[5 Description of effect]
As described above, according to power storage device 10 according to the embodiment of the present invention, two fixing portions 500 for fixing end plate 200a to external member 400 between end power storage element 100a and end plate 200a. A space (first space S1) continuous from at least one end to the central portion of the region R1 in which the end charge storage device 100a and the end plate 200a overlap with each other. . Here, the portion of the end plate 200a fixed to the outside is a portion that is strong against the force from the end storage element 100a. Therefore, a space is formed between the two fixing portions 500 that fix the end plate 200a to the outside, and the force from the end storage element 100a is received in the vicinity of the two fixing portions 500. Further, since the space is a space which is continuous from at least one end of the region R1 in which the end plate 200a faces the end charge storage device 100a to the central portion, the end charge storage device 100a The force received from end storage element 100a can be avoided until the central portion that is considered to receive the most force. As described above, in the portion where the end plate 200a is easily damaged, the force from the end storage element 100a is received by the strong portion while avoiding the force from the end storage element 100a, thereby suppressing the damage of the end plate 200a. can do. As a result, there is no need to make the end plate 200 a rigid, and the size reduction of the end plate 200 a can be realized.

  In addition, the end plate 200 a has two first protrusions 220 protruding toward the end power storage device 100 a, and the two first protrusions 220 are fixed regions fixed to the two fixing portions 500. A first space S1 is formed continuously between the two first protrusions 220, which is disposed at a position overlapping with R2. As described above, since the end plate 200a has the two first protrusions 220 protruding toward the end charge storage device 100a, if the end plate 200a is disposed, it is easy to set the first fixed portion between the two fixing portions 500. Space S1 can be formed. Thus, the force from the end storage element 100a can be received in the vicinity of the two fixing portions 500, so that damage to the end plate 200a can be suppressed.

  The fixing area R2 is an area formed by extending the maximum width of the fixing portion 500 of the end plate 200a. That is, since the region obtained by extending the maximum width of the fixing portion 500 up and down is a portion to which a fixing force is applied by the fixing portion 500, this region is referred to as a fixing region R2, and at a position overlapping with the fixing region R2. The first protrusion 220 is disposed. Thus, the first protrusion 220 can receive a force from the end charge storage device 100a, so that damage to the end plate 200a can be suppressed.

  In addition, the first space S1 is a continuous space formed at a position not overlapping the bonding portion 113 formed in the container 110 of the end portion storage device 100a in the region from one end to the other end of the end plate 200a. is there. Here, in order to suppress damage to the bonding portion 113, it is preferable to press the bonding portion 113 with the end plate 200a, and therefore, it is preferable not to form a space at a position facing the bonding portion 113. Therefore, by forming a space continuously from one end to the other end of the end plate 200a at a position other than the bonding portion 113, damage to the end plate 200a is suppressed while suppressing damage to the bonding portion 113. can do.

  The same effect can be achieved also on the end plate 200 b side.

[6 Description of Modifications]
(Modification 1)
Next, a first modification of the above embodiment will be described. FIG. 6 is a perspective view showing a configuration of an end plate 200c and a spacer 600 according to the first modification of the present embodiment. 6 is a view corresponding to FIG. 3 in the above embodiment. FIGS. 7A and 7B are top views showing a configuration in which end plate 200c and spacer 600 according to Modification 1 of the present embodiment are attached to end portion power storage element 100a. 7A and 7B are diagrams corresponding to (a) of FIG. 5 in the above embodiment.

  First, as shown in FIG. 6, in the present modification, an end plate 200c and a spacer 600 are disposed instead of the end plate 200 of the above embodiment. The end plate 200c and the spacer 600 have such a shape that the end plate 200 of the above embodiment is divided into two members. That is, the end plate 200c has the same shape as the plate main body 210 of the end plate 200 of the above embodiment. Further, the spacer 600 is a rectangular and flat spacer body 610, and a second projection similar in shape to the two first projections 220 and the end projections 230 of the end plate 200 of the above embodiment. 620 and an end projection 630. The other configuration is the same as that of the above embodiment, and thus the detailed description will be omitted.

  End plate 200c can be formed with the same material as end plate 200 of the above-mentioned embodiment. In addition, the spacer 600 is made of, for example, an insulating member such as polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polybutylene terephthalate (PBT) or ABS resin, and mica pieces are accumulated. Thermal insulation members such as a dummy material constituted by bonding, phenol resin, urea resin, melamine resin, unsaturated polyester resin, diallyl phthalate resin, epoxy resin, silicon resin, alkyd resin, polyimide, polyaminobismaleimide, casein resin It can be formed of a thermosetting (and heat resistant) member such as furan resin or urethane resin, or a heat resistant member such as ceramics.

  And as shown to FIG. 7A, the spacer 600 is arrange | positioned between the end plate 200c and the end part electrical storage element 100a. Thereby, the two second protrusions 620 aligned in the second direction (X-axis direction) are disposed so as to protrude toward at least one of the end energy storage device 100a and the end plate 200c. In the figure, the two second protrusions 620 are disposed so as to protrude toward the end storage element 100 a. The shape and arrangement position of the two second protrusions 620 are the same as the shape and arrangement position of the two first protrusions 220 in the above embodiment. That is, each of the two second protrusions 620 is disposed at a position overlapping with each of the fixing regions fixed to the two fixing portions 500 of the end plate 200c when viewed from the first direction (Y-axis direction). Be done.

  As a result, a second space S3 and two side spaces S4 are formed between the spacer 600 and the end charge storage device 100a. Here, the second space S3 is a space formed continuously between the two second protrusions 620. The two side spaces S4 are spaces formed on both sides of the second space S3. In addition, the shape, the arrangement position, and the like of the second space S3 and the side space S4 are the same as the shape, the arrangement position, and the like of the first space S1 and the side space S2 in the above embodiment.

  Also, as shown in FIG. 7B, the two second protrusions 620 may be disposed to protrude toward the end plate 200c. That is, the spacer 600 in FIG. 7A may be disposed in an inverted manner. As a result, a second space S3 and two side spaces S4 are formed between the spacer 600 and the end plate 200c.

  As described above, according to the power storage device of the present modification, the same effects as those of the above embodiment can be obtained. In particular, the power storage device according to the present modification includes the spacer 600 having the two second protrusions 620 protruding toward at least one of the end energy storage device 100 a and the end plate 200 c, and the two second protrusions 620. Is disposed at a position overlapping the fixing region fixed to the two fixing portions 500, and a second space S3 is continuously formed between the two second protrusions 620. As described above, since the spacer 600 has the two protrusions projecting toward at least one of the end charge storage device 100a and the end plate 200c, the end plate 200c is the same as the end plate 200c even if the protrusions are not formed on the end plate 200c. If the spacer 600 of another member is arrange | positioned, 2nd space S3 can be easily formed between the two fixing parts 500. As shown in FIG. Thus, the force from the end storage element 100a can be received in the vicinity of the two fixing portions 500, so that damage to the end plate 200c can be suppressed.

  A spacer 600 in the present modification may be disposed not between the end plate 200 c but between the end plate 200 and the end storage element 100 a in the above embodiment. In addition, the spacer 600 may have a protruding portion that protrudes to one of the end power storage device 100a and the end plate 200c, but not to both.

(Modification 2)
Next, a second modification of the above embodiment will be described. FIG. 8 is a perspective view showing a configuration of an end plate 200d according to Modification 2 of the present embodiment. FIG. 8 is a diagram corresponding to FIG. 3 in the above embodiment.

  As shown in FIG. 8, the end plate 200 d in this modification does not have the end protrusion 230 of the end plate 200 in the above embodiment. That is, when the end plate 200d is attached to the end charge storage device 100a, a continuous space is formed from one end (upper end) to the other end (lower end) of the end plate 200d. In other words, in the Z-axis direction, a continuous space is formed from one end to the other end in a region where end storage element 100a and end plate 200d overlap when viewed from the Y-axis direction. The other configuration is the same as that of the above embodiment, and thus the detailed description will be omitted.

(Other modifications)
As mentioned above, although the electrical storage apparatus which concerns on embodiment and its modification of this invention was demonstrated, this invention is not limited to this embodiment and its modification. That is, it should be understood that the embodiment disclosed this time and the modification thereof are illustrative in all points and not restrictive. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

  For example, in the above embodiment and its modification, the end plate 200a (or the end plates 200c and 200d) side and the end plate 200b side have the above configuration. However, only one of the end plate 200a (or the end plates 200c and 200d) and the end plate 200b may have the above configuration.

  Further, in the above-described embodiment and the modification thereof, the storage element 100 has the joint portion 113 between the container body 111 and the lid 112 on the side surface of the container 110 (surfaces on both sides in the X axis direction and both sides in the Y axis direction). I decided to do it. However, the storage element 100 may have the bonding portion 113 on the upper surface (surface on the plus side in the Z-axis direction) of the container 110. For example, when the lid 112 is fitted into the opening at the top of the container main body 111 and welding is performed from above, the bonding portion 113 is formed on the upper surface of the container 110. Even in this case, the end projection 230 of the end plate 200 (or the end projection 630 of the spacer 600) is disposed in contact with the side surface of the container 110 at a position overlapping the joint 113 when viewed from the Y-axis direction. Thus, the joint 113 can be reinforced to suppress damage to the joint 113.

  Further, in the above-described embodiment and the modified example thereof, the end plate (or the spacer 600) integrally has a projecting portion such as the first projecting portion 220 (or the second projecting portion 620). However, the end plate (or the spacer 600) may have separate projections.

  Further, in the above-described embodiment and the modification thereof, the end plate (or the spacer 600) is provided with the protruding portion, so that a space is formed between the end portion power storage element 100a and the end plate. . However, a space may be formed between the end portion storage element 100 a and the end plate by providing the end storage element 100 a with a protruding portion that protrudes toward the end plate.

  Further, in the above embodiment and its modification, the first projecting portion 220 (or the second projecting portion 620) of the end plate (or the spacer 600) is arranged to extend in the Z-axis direction. . However, the first projecting portion 220 (or the second projecting portion 620) may be shorter than the length in the above-described embodiment and the variation thereof, and is divided into a plurality of projecting portions aligned in the Z-axis direction. May be

  Further, in the above-described embodiment and the modification thereof, the fixing portion 500 is extended from the lower end to the upper end of the end plate. However, the fixing portion 500 may have a length shorter than that, and may be disposed, for example, from the lower end of the end plate to the center or only at the lower end of the end plate. However, from the viewpoint of suppressing the expansion of the storage element 100, the fixing portion 500 is preferably disposed at a position corresponding to at least the central portion of the end plate, such as above the lower portion of the end plate and above the central portion.

  Moreover, in the said embodiment and its modification, we decided that the two fixing | fixed parts 500 are arrange | positioned along with the X-axis direction. However, the number of fixing portions 500 is not limited. For example, two fixing portions 500 may be arranged in the Y-axis direction, and two sets of the fixing portions 500 may be arranged in the X-axis direction. Further, three or more fixing portions 500 may be arranged side by side in the X-axis direction. Even in such a case, if a space is formed between two adjacent fixing parts 500 in the X-axis direction, the same effect as that of the above embodiment can be obtained.

  Further, a form constructed by arbitrarily combining the above embodiment and the above modification is also included in the scope of the present invention.

  Further, the present invention can not only be realized as such a power storage device, but also can be realized as an end plate or a spacer 600 provided in the power storage device.

  The present invention is applicable to a storage device and the like provided with a storage element such as a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 10 power storage device 100 power storage device 100a, 100b end portion power storage device 100c middle portion power storage device 110 container 111 container main body 112 lid 113 joint portion 120 electrode terminal 200, 200a, 200b, 200c, 200d end plate 210 plate main portion 211 through hole 220 first protrusion 230 end protrusion 300 restraint member 310 bolt 400 external member 500 fixing portion 600 spacer 610 spacer main portion 620 second protrusion 630 end protrusion

Claims (5)

One or more storage elements,
An end plate disposed on the first direction side of an end portion storage element disposed on an end portion on the first direction side of the one or more storage elements;
A fixing portion for fixing the end plate to an external member, the fixing portion including two fixing portions arranged in a second direction intersecting the first direction;
A space disposed between the end storage element and the end plate, the space being disposed between the two fixed parts in the second direction, the space crossing the first direction and the second direction; In a direction, a continuous space is formed from at least one end to a central portion of a region where the end portion storage device and the end plate overlap with each other when viewed from the first direction. The end plate has two first protrusions which protrude toward the end charge storage device and are aligned in the second direction;
Each of the two first protrusions is disposed at a position overlapping with each of the fixing regions fixed to the two fixing portions of the end plate as viewed from the first direction;
The power storage device according to claim 1, wherein the space has a first space continuously formed between the two first protrusions. And a spacer disposed between the end plate and the end charge storage device,
The spacer has two second protrusions which protrude toward at least one of the end portion power storage device and the end plate and are aligned in the second direction.
Each of the two second protrusions is disposed at a position overlapping with each of fixing regions fixed to the two fixing portions of the end plate, as viewed from the first direction;
The power storage device according to claim 1, wherein the space has a second space continuously formed between the two second protrusions. The power storage device according to claim 2, wherein the fixed area is an area formed by extending a maximum width of the fixed portion in the second direction in the second direction in the end plate. The space is in a position not overlapping the junction formed in the container of the end charge storage device as viewed from the first direction in the region from one end to the other end of the end plate in the third direction. It is the continuous space formed, The electrical storage apparatus of any one of Claims 1-4.

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