JP2016054118A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a trouble caused by power storage elements equally expanding.SOLUTION: A power storage device 1 comprises: power storage elements 100; and holding members 320 and 310 which are disposed so as to hold the power storage elements 100 therebetween. The holding member 320 has a high-rigidity part AR11 which is higher, in rigidity, than the holding member 310.SELECTED DRAWING: Figure 7A

Description

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

  2. Description of the Related Art In a power storage device including a power storage element, a configuration is known in which a pair of end plates arranged so as to sandwich the power storage element and fastening bands whose both ends are fixed to the pair of end plates are known. With such a configuration, the power storage device is housed in the case of the power storage device in a state where the power storage device, the pair of end plates, and the fastening band are integrally held even when there are a plurality of power storage devices. (For example, refer to Patent Document 1).

Japanese Patent No. 5171015

  Here, the power storage element expands due to gas generated by repeated charge and discharge. At this time, in the above-described conventional configuration, the power storage device may be equally expanded toward each end plate, thereby causing a problem in the power storage device. For example, when one end plate and the exterior body of the power storage device are fixed, the exterior body may be deformed or damaged due to expansion of the electrical storage element.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a power storage device that can suppress problems caused by the power storage elements expanding equally.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention is a power storage device including a power storage element, and includes a first sandwiching portion and a second sandwiching portion arranged so as to sandwich the power storage element. The first clamping part has a highly rigid part having higher rigidity than the second clamping part.

  As described above, since the first sandwiching portion includes the high-rigidity portion, the power storage element is more easily expanded to the second sandwiching portion side than to the first sandwiching portion side. That is, the expansion of the power storage element toward the first clamping unit can be suppressed. Therefore, the malfunction of the electrical storage apparatus which arises when an electrical storage element expand | swells equally can be suppressed.

  The high-rigidity portion may be disposed at a position facing the central portion of the power storage element.

  Here, in the power storage element, the central portion of the power storage element tends to expand due to repeated charge and discharge. Therefore, by providing the highly rigid portion at a position facing the central portion of the power storage element, expansion of the power storage element can be further effectively suppressed.

  The first clamping unit may be disposed on the bottom side of the power storage device.

  According to this, expansion of the electricity storage element to the bottom surface side of the electricity storage device can be suppressed. Thus, even when the bottom surface of the power storage device is disposed so as to contact another member, interference between the power storage device and the other member due to expansion of the power storage element can be suppressed.

  In addition, the first sandwiching portion may include a plurality of members arranged in an overlapping manner, and the high-rigidity portion may be a portion formed by overlapping the plurality of members.

  According to this, since the high rigidity portion is formed by stacking a plurality of members, for example, the high rigidity portion is formed with fewer steps compared to the case where the high rigidity portion is formed by changing the shape of one member. Can be realized. That is, a highly rigid part can be formed easily.

  The first clamping unit may be fixed to an exterior body of the power storage device.

  Thus, when the 1st clamping part is being fixed to the exterior body of an electrical storage apparatus, when the 1st clamping part deform | transforms, the said exterior body may deform | transform or damage. On the other hand, in this aspect, the deformation of the first clamping portion can be suppressed by suppressing the expansion of the power storage element toward the first clamping portion. Therefore, even when the power storage element expands, the first sandwiching portion and the exterior body of the power storage device can be firmly fixed.

  In addition, a gap in which the electrolyte solution leaking from the power storage element can be disposed may be formed between the first sandwiching portion and the exterior body of the power storage device.

  According to this, when the electrolyte solution (nonaqueous electrolyte) sealed in the electricity storage element leaks out, the electrolyte solution can be disposed in the gap, so that the electrolyte solution leaks out of the electricity storage device. Can be suppressed.

  The power storage device according to another aspect of the present invention is a power storage device including a power storage element, and includes a first sandwiching portion and a second sandwiching portion that are disposed so as to sandwich the power storage element. The clamping part has higher rigidity than the second clamping part.

  As described above, since the first sandwiching portion has higher rigidity than the second sandwiching portion, the power storage element is more easily expanded to the second sandwiching portion side than the first sandwiching portion side. That is, the expansion of the power storage element toward the first clamping unit can be suppressed. Therefore, the malfunction of the electrical storage apparatus which arises when an electrical storage element expand | swells equally can be suppressed.

  According to the power storage device of the present invention, it is possible to suppress problems caused by the power storage elements expanding equally.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electrical storage unit which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electrical storage unit which concerns on embodiment of this invention. It is a perspective view which shows the structure of the electrical storage element which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of disassembling the clamping member which concerns on embodiment of this invention. It is a perspective view which shows the structure of the clamping member which concerns on embodiment of this invention. It is a disassembled perspective view which shows each component at the time of disassembling the clamping member which concerns on embodiment of this invention. It is a perspective view which shows the structure of the 1st metal end plate which concerns on embodiment of this invention. It is a perspective view which shows the detailed structure of the 2nd metal end plate which concerns on embodiment of this invention. It is a bottom view which shows the structure of the clamping member which concerns on embodiment of this invention. It is a perspective view which shows the mode of the attachment to the exterior body of the electrical storage unit and electric equipment which have the clamping member which concerns on embodiment of this invention. It is sectional drawing which shows the structure concerning the space | gap formed between the clamping member and 2nd exterior body which concerns on embodiment of this invention, (a) is whole sectional drawing, (b) is one of (a). FIG.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, assembling methods, assembling orders, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

(Embodiment)
First, the configuration of the power storage device 1 will be described.

  FIG. 1 is a perspective view showing an appearance of power storage device 1 according to the embodiment of the present invention. FIG. 2 is an exploded perspective view showing each component when the power storage device 1 according to the embodiment of the present invention is disassembled.

  In these figures, the Z-axis direction is shown as the vertical direction, and the Z-axis direction will be described below as the vertical direction. However, depending on the usage, the Z-axis direction may not be the vertical direction. The axial direction is not limited to the vertical direction.

  The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 1 is a battery module used for power storage use, power supply use, and the like.

  As shown in these drawings, the power storage device 1 includes an exterior body 10 including a first exterior body 11 and a second exterior body 12, and an electrical storage unit 30 and an electric device 40 accommodated inside the exterior body 10. ing.

  The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1 and is disposed outside the power storage unit 30 and the electric device 40. That is, the exterior body 10 arranges the power storage unit 30 and the electric device 40 at predetermined positions, and protects the power storage unit 30 and the electric device 40 from an impact or the like. Moreover, the exterior body 10 is comprised, for example with insulating resin, such as a polycarbonate and a polypropylene (PP), and avoids that the electrical storage unit 30 and the electric equipment 40 contact an external metal member.

  Here, the exterior body 10 includes a first exterior body 11 constituting a lid body of the exterior body 10 and a second exterior body 12 constituting a main body of the exterior body 10. The first exterior body 11 is a flat rectangular cover member that closes the opening of the second exterior body 12, and is provided with a positive external terminal 21 and a negative external terminal 22. The power storage device 1 charges electricity from the outside via the positive electrode external terminal 21 and the negative electrode external terminal 22, and discharges electricity to the outside. The second exterior body 12 is a bottomed rectangular cylindrical housing in which an opening is formed, and houses the power storage unit 30 and the electric device 40.

  In addition, the 1st exterior body 11 and the 2nd exterior body 12 may be formed with the member of the same material, and may be formed with the member of a different material.

  The power storage unit 30 includes a plurality of power storage elements, and is connected to the positive external terminal 21 and the negative external terminal 22 provided on the first exterior body 11. In the present embodiment, as shown in FIG. 2, the power storage unit 30 is stacked in the Z-axis direction and arranged in the second exterior body 12 with a plurality of power storage elements placed horizontally. The power storage unit 30 is accommodated inside the exterior body 10 by covering the first exterior body 11 from above. The detailed configuration of the power storage unit 30 will be described later.

  The electric device 40 is a rectangular device in which a circuit board, a relay, and the like are arranged on the inside, and is arranged on the side of the power storage unit 30 (X-axis direction plus side). In the present embodiment, as shown in FIG. 2, the electric device 40 is erected in the Z-axis direction with the circuit board placed vertically, and is disposed in the second exterior body 12. The electrical device 40 is accommodated inside the exterior body 10 by covering the first exterior body 11 from above.

  The circuit board provided in the electric device 40 is connected to the positive terminal or the negative terminal of each power storage element in the power storage unit 30 by wiring (lead wire). For example, the charge state or the discharge state (voltage) of the power storage element , Battery status such as temperature), and so on.

  Next, the configuration of the power storage unit 30 will be described in detail.

  3 and 4 are perspective views showing the configuration of the power storage unit 30 according to the embodiment of the present invention. Specifically, FIG. 3 is an exploded perspective view showing a configuration when the bus bar frame 500 and the bus bar 600 are separated from the power storage unit 30. FIG. 4 is an exploded perspective view showing each component when the components separating the bus bar frame 500 and the bus bar 600 from the power storage unit 30 are further disassembled.

  In these figures and the following figures, for convenience of explanation, the Y-axis direction is shown as the vertical direction, and there is a place where the Y-axis direction is described as the vertical direction. The Y-axis direction is not always the vertical direction.

  As shown in these drawings, the power storage unit 30 includes a plurality of power storage elements 100 (eight power storage elements 100 in the present embodiment), a plurality of spacers 200 (seven spacers 200 in the present embodiment), and , A pair of clamping members 300, a plurality of restraining members 400 (in this embodiment, four restraining members 410 to 440), a bus bar frame 500, and a plurality of bus bars 600 (in this embodiment, five bus bars 600). ).

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular shape and is disposed adjacent to the spacer 200. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 200 and arranged in the Z-axis direction.

  In the present embodiment, the power storage element 100 is disposed laterally inside the outer package 10 (see FIG. 2). However, in FIG. It has shown in the state arrange | positioned toward. In addition, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. The detailed configuration of the power storage device 100 will be described later.

  The spacer 200 is an insulating plate-like member that is disposed between two adjacent power storage elements 100 and formed of a resin or the like that insulates between the two power storage elements 100. In the present embodiment, seven spacers 200 are arranged between the eight power storage elements 100. The spacer 200 is formed of an insulating resin such as polycarbonate or polypropylene (PP), but may be formed of any material as long as it is a member having an insulating property.

  Spacer 200 is formed so as to cover approximately half of the front side or back side of storage element 100 (substantially half when divided into two in the Z-axis direction). That is, a recess is formed on both the front side or the back side (both sides in the Z-axis direction) of the spacer 200, and approximately half of the power storage element 100 is inserted into the recess. With such a configuration, the two spacers 200 sandwiching the power storage element 100 cover most of the power storage element 100, so that the insulating property between the power storage element 100 and another conductive member is covered by the spacer 200. Can be improved.

  The sandwiching member 300 includes a pair of sandwiching members 310 and 320 that are flat plate-like members, and sandwiches and holds the plurality of power storage elements 100 from both sides in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100.

  That is, the clamping member 310 is a flat plate-like member that is disposed on the positive side in the Z-axis direction relative to the power storage element 100 that is disposed on the most positive side in the Z-axis direction among the plurality of power storage elements 100. Further, the clamping member 320 is a flat plate-like member that is disposed on the minus side in the Z-axis direction with respect to the electricity storage element 100 that is disposed on the most minus side in the Z-axis direction among the plurality of power storage elements 100. The sandwiching member 310 and the sandwiching member 320 sandwich and hold the plurality of power storage elements 100 and the plurality of spacers 200 from both sides in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100 and the plurality of spacers 200. .

  In addition, the sandwiching member 300 (the sandwiching members 310 and 320) is formed of a metal (conductive) member such as stainless steel or aluminum from the viewpoint of strength or the like. The insulating member is disposed to ensure insulation from the power storage element 100. Note that the clamping member 300 is not limited to a metal (conductive) member, and may be formed of, for example, an insulating member having high strength. Further, the sandwiching member 310 and the sandwiching member 320 may be formed of members of the same material, or may be formed of members of different materials.

  The restraining member 400 is a member that is attached to the sandwiching member 300 at both ends and restrains the plurality of power storage elements 100. That is, the restraining member 400 is disposed so as to straddle the plurality of power storage elements 100, and applies a restraining force in the arrangement direction (Z-axis direction) of the plurality of power storage elements to the plurality of power storage elements 100. The restraining member 400 is preferably formed of a metal member such as stainless steel or aluminum, for example, similarly to the clamping member 300, but may be formed of a member other than metal.

  Specifically, the restraining member 400 has one end attached to the holding member 310 and the other end attached to the holding member 320. Then, the restraining member 400 applies a restraining force in the arrangement direction of the plurality of power storage elements 100 and the plurality of spacers 200 to the plurality of power storage elements 100 and the plurality of spacers 200.

  Here, the restraining member 400 includes restraining members 410 to 440. The restraining members 410 and 420 are disposed on both sides of the plurality of power storage elements 100 in the vertical direction (both sides in the Y-axis direction), and sandwich and restrain the plurality of power storage elements 100 from both sides. The restraining members 430 and 440 are arranged on both sides (both sides in the X-axis direction) of the plurality of power storage elements 100, and sandwich and restrain the plurality of power storage elements 100 from both sides.

  Specifically, the restraining member 410 and the restraining member 420 are a pair of long and flat members disposed on the plus side and the minus side in the Y-axis direction of the plurality of power storage elements 100. The restraining member 430 and the restraining member 440 are a pair of long and flat members disposed on the plus side and the minus side in the X-axis direction of the plurality of power storage elements 100.

  The bus bar frame 500 is a member that can insulate the bus bar 600 from other members, protect various wirings disposed in the power storage device 1, and restrict the position of the bus bar 600. In particular, the bus bar frame 500 positions the bus bar 600 with respect to the plurality of power storage elements 100.

  Specifically, the bus bar frame 500 is placed above the plurality of power storage elements 100 (Y-axis direction plus side) and positioned with respect to the plurality of power storage elements 100. A bus bar 600 is placed on the bus bar frame 500. At this time, the protrusion of the bus bar frame 500 is inserted into the opening formed in the bus bar 600, whereby the bus bar 600 is positioned with respect to the bus bar frame 500. As a result, the bus bar 600 is positioned with respect to the plurality of power storage elements 100 and joined to the respective electrode terminals of the plurality of power storage elements 100.

  The bus bar frame 500 is formed of an insulating resin such as polycarbonate or polypropylene (PP), but may be formed of any material as long as it is an insulating member. The detailed configuration of the bus bar frame 500 and the detailed configuration in which the bus bar frame 500 positions the bus bar 600 will be described later.

  Bus bar 600 is a bus bar electrically connected to each of the plurality of power storage elements 100. That is, the bus bar 600 is a conductive member that is electrically connected to each electrode terminal included in the plurality of power storage elements 100, and any one of the electrode terminals included in the plurality of power storage elements 100 is electrically connected to each other. To do. Specifically, the bus bar 600 is disposed on the surface of each electrode terminal included in the plurality of power storage elements 100 and connected (joined) to the electrode terminal.

  The bus bar 600 is made of, for example, aluminum as a conductive member, but the material of the bus bar 600 is not particularly limited. In addition, the bus bar 600 may be formed of a member made of the same material, or one of the bus bars may be formed of a member made of a different material.

  Next, the structure of the electrical storage element 100 is demonstrated in detail.

  FIG. 5 is a perspective view showing a configuration of power storage element 100 according to the embodiment of the present invention. Specifically, this figure is a perspective view showing the inside of the electricity storage device 100 through the container 110 of the electricity storage device 100.

  As shown in the figure, the electricity storage element 100 includes a container 110, a positive electrode terminal 120, and a negative electrode terminal 130. In addition, an electrode body 140, a positive electrode current collector 150, and a negative electrode current collector 160 are disposed inside the container 110. In addition, although liquid, such as electrolyte solution, is enclosed in the inside of the container 110, illustration of the said liquid is abbreviate | omitted.

  The container 110 is composed of a rectangular cylindrical body made of metal and having a bottom, and a metal lid that closes the opening of the body. The container 110 can seal the inside by welding the lid portion and the main body after the electrode body 140 and the like are accommodated therein.

  The electrode body 140 includes a positive electrode, a negative electrode, and a separator, and is a power generation element that can store electricity. Specifically, the electrode body 140 is a wound electrode body formed by winding what is arranged in layers so that a separator is sandwiched between a positive electrode and a negative electrode. The electrode body 140 may be a laminated electrode body in which flat plate plates are laminated.

  Here, the positive electrode is an electrode plate in which a positive electrode active material layer is formed on the surface of a long strip-like conductive positive electrode current collector foil made of aluminum or an aluminum alloy, and the negative electrode is made of copper or a copper alloy. It is an electrode plate in which a negative electrode active material layer is formed on the surface of a long strip-like conductive negative electrode current collector foil, and the separator is a microporous sheet. Note that the positive electrode, the negative electrode, and the separator used for the energy storage device 100 are not particularly different from those conventionally used, and any known material can be used as long as the performance of the energy storage device 100 is not impaired. Further, the electrolyte solution (nonaqueous electrolyte) sealed in the container 110 is not particularly limited as long as it does not impair the performance of the power storage device 100, and various types can be selected.

  The positive electrode current collector 150 is a member that is disposed between the positive electrode of the electrode body 140 and the side wall of the container 110 and has electrical conductivity and rigidity that are electrically connected to the positive electrode terminal 120 and the positive electrode. The positive electrode current collector 150 is made of aluminum or an aluminum alloy as in the positive electrode current collector foil. The negative electrode current collector 160 is disposed between the negative electrode of the electrode body 140 and the side wall of the container 110, and has conductivity and rigidity that are electrically connected to the negative electrode terminal 130 and the negative electrode of the electrode body 140. It is a member. The negative electrode current collector 160 is made of copper or a copper alloy or the like, similarly to the negative electrode current collector foil.

  The positive electrode terminal 120 is an electrode terminal electrically connected to the positive electrode of the electrode body 140 via the positive electrode current collector 150, and the negative electrode terminal 130 is the negative electrode of the electrode body 140 via the negative electrode current collector 160. The electrode terminal is electrically connected to. In other words, the positive electrode terminal 120 and the negative electrode terminal 130 lead the electricity stored in the electrode body 140 to the external space of the power storage element 100, and also store the electricity in the internal space of the power storage element 100 in order to store the electricity in the electrode body 140. It is an electrode terminal made of metal for introducing.

  The positive electrode current collector 150 is a member that is disposed between the positive electrode of the electrode body 140 and the side wall of the container 110 and has electrical conductivity and rigidity that are electrically connected to the positive electrode terminal 120 and the positive electrode. The positive electrode current collector 150 is made of aluminum or an aluminum alloy as in the positive electrode current collector foil. The negative electrode current collector 160 is disposed between the negative electrode of the electrode body 140 and the side wall of the container 110, and has conductivity and rigidity that are electrically connected to the negative electrode terminal 130 and the negative electrode of the electrode body 140. It is a member. The negative electrode current collector 160 is made of copper or a copper alloy or the like, similarly to the negative electrode current collector foil.

  Next, the structure of the clamping member 300 (the clamping members 310 and 320) will be described in detail with reference to FIGS.

  First, the structure of the clamping member 310 is demonstrated using FIG. FIG. 6 is an exploded perspective view showing each component when the clamping member 310 according to the embodiment of the present invention is disassembled.

  As shown in FIG. 6, the clamping member 310 is disposed in order from the plurality of power storage elements 100 and the plurality of spacers 200 in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100 and the plurality of spacers 200. And a resin end plate 311 and a metal end plate 312. Hereinafter, each component member which comprises the clamping member 310 is demonstrated in detail.

  The resin end plate 311 is an insulative plate-shaped member formed of a resin or the like that insulates the power storage element 100 and the metal end plate 312 that is disposed closest to the power storage element 100 among the constituent members constituting the clamping member 310. It is a member. The resin end plate 311 is formed of an insulating resin such as polycarbonate or polypropylene (PP), but may be formed of any material as long as it is an insulating member.

  Further, the resin end plate 311 is substantially half of the front side of the power storage element 100 arranged closest to the clamping member 310 among the plurality of power storage elements 100 (Z-axis direction plus side when divided into two in the Z-axis direction). Is formed so as to cover approximately half). That is, a recess is formed on the back side (minus side in the Z-axis direction) of the resin end plate 311, and approximately half of the front side of the electricity storage element 100 is inserted into the recess. With such a configuration, the spacer 200 and the resin end plate 311 sandwiching the power storage element 100 cover most of the power storage element 100, so that the power storage element 100 and the resin end plate 311 allow the power storage Insulation between the element 100 and another conductive member can be improved.

  The metal end plate 312 is a flat plate-like member placed on the front side (Z-axis direction plus side) of the resin end plate 311. The metal end plate 312 is formed of a metal (conductive) member such as stainless steel or aluminum from the viewpoint of strength or the like, but may be formed of any material as long as it has a necessary strength. It doesn't matter.

  The metal end plate 312 is formed so as to protrude outward from the flat plate portion positioned on the front side (Z-axis direction plus side) of the plurality of power storage elements 100, and is bent to the Z-axis direction negative side. The two pairs of bent portions are connected to each other by being screwed to the restraining member 400 (restraining members 410 to 440).

  Next, the structure of the clamping member 320 will be described in detail with reference to FIGS. 7A to 9.

  FIG. 7A is a perspective view showing the configuration of the clamping member 320 according to the embodiment of the present invention. FIG. 7B is an exploded perspective view showing each component when the holding member 320 according to the embodiment of the present invention is disassembled.

  The clamping member 320 shown in these drawings has a high-rigidity part AR11 having higher rigidity than the clamping member 310. The clamping member 320 is provided with screw holes 301 a to 301 d for fixing the clamping member 320 to the second exterior body 12 (see FIG. 2) of the power storage device 1.

  Here, the rigidity of the high-rigidity part AR <b> 11 only needs to be higher than the rigidity of the portion of the clamping member 310 that is on the side of the power storage element 100 (the Z-axis direction plus side). The magnitude relationship with is not a problem.

  Further, the rigidity of the clamping members 310 and 320 can be evaluated by, for example, reading the clamping members 310 and 320 by 3D scanning and using CAE (Computer Aided Engineering) analysis or the like.

  The sandwiching member 320 includes a resin end plate 321, a first end disposed in order from the plurality of power storage elements 100 and the plurality of spacers 200 in the arrangement direction (Z-axis direction) of the plurality of power storage elements 100 and the plurality of spacers 200. A metal end plate 322 and a second metal end plate 323 are provided. Hereinafter, each component member which comprises the clamping member 320 is demonstrated in detail.

  First, the resin end plate 321 will be described in detail.

  The resin end plate 321 is a plate-like member that is disposed closest to the power storage element 100 among the constituent members constituting the clamping member 320, and the power storage element 100, the first metal end plate 322, and the second metal end plate 323. It is an insulating plate-like member formed of a resin or the like that insulates from each other. The resin end plate 321 is formed of an insulating resin such as polycarbonate or polypropylene (PP), but may be formed of any material as long as it is an insulating member.

  The resin end plate 321 is substantially half of the back side of the power storage element 100 arranged closest to the clamping member 320 among the plurality of power storage elements 100 (minus side in the Z-axis direction when divided into two in the Z-axis direction). Is formed so as to cover approximately half). That is, a recess is formed on the front side (Z-axis direction plus side) of the resin end plate 321, and approximately half of the back side of the electricity storage element 100 is inserted into the recess. With such a configuration, the spacer 200 and the resin end plate 321 sandwiching the power storage element 100 cover most of the power storage element 100, so that the power storage element 100 and the resin end plate 321 allow the power storage. Insulation between the element 100 and another conductive member can be improved.

  Further, screw holes 301a to 301d for fixing the clamping member 320 to the second exterior body 12 (see FIG. 2) of the power storage device 1 by screwing are provided on the back side (Z-axis direction negative side) of the resin end plate 321. Is provided.

  Further, on the back side (Z-axis direction minus side) of the resin end plate 321, two recesses 355 that are recessed toward the front side (Z-axis direction plus side) are further provided. These two recesses 355 can be used for positioning when the first metal end plate 322, the second metal end plate 323, and the resin end plate 321 are assembled, for example.

  Next, the first metal end plate 322 will be described in detail with reference to FIG. FIG. 8 is a perspective view showing the configuration of the first metal end plate 322 according to the embodiment of the present invention.

  As shown in FIG. 7B, the first metal end plate 322 is a flat plate member placed on the back side (Z-axis direction minus side) of the resin end plate 321. The first metal end plate 322 is formed of a metal (conductive) member such as stainless steel or aluminum from the viewpoint of strength or the like, but is formed of any material as long as it has a necessary strength. It may be done.

  The first metal end plate 322 is provided in the high rigidity portion AR11 shown in FIG. 7A. That is, in the present embodiment, the high rigidity portion AR11 is a portion formed by overlapping a plurality of members. The plurality of members are the first metal end plate 322 and the second metal end plate 323 in the present embodiment.

  That is, as shown in FIG. 6, the clamping member 310 has one metal end plate 312, whereas the clamping member 320 has two metal end plates (first metal end plate 322 and second metal end plate 323). Have Thereby, in this Embodiment, the part formed by the 1st metal end plate 322 and the 2nd metal end plate 323 being piled up among the clamping members 320 becomes higher than the clamping member 310. FIG.

  As shown in FIG. 8, the first metal end plate 322 has a flat plate portion 361 located on the back side (minus side in the Z-axis direction) of the plurality of power storage elements 100 and projects outward from the flat plate portion 361. And a pair of bent portions 362 that are bent to the plus side in the Z-axis direction. The first metal end plate 322 has holes 363a to 363d provided in each of the pair of bent portions 362 for connecting the first metal end plate 322 and the restraining members 410 and 420 by screws. .

  As shown in FIG. 8, the flat plate portion 361 includes a plurality of ribs 364 that protrude to the positive side in the Z-axis direction. Each of these ribs 364 extends in the short direction of the storage element 100 when viewed from the positive side in the Z-axis direction. That is, the rib 364 extends in the Y-axis direction of the first metal end plate 322 when viewed from the positive side in the Z-axis direction. Thereby, the first metal end plate 322 can increase the rigidity in the Y-axis direction.

  The flat plate portion 361 is formed with two through holes 365 provided at positions corresponding to the two concave portions 355 of the resin end plate 321. These two through holes 365 can be used, for example, for positioning when the first metal end plate 322, the second metal end plate 323, and the resin end plate 321 are assembled.

  The pair of bent portions 362 are formed so as to protrude from both sides in the short side direction (both sides in the Y axis direction) of the electricity storage device 100 when viewed from the minus side in the Z axis direction before being bent, and bend to the plus side in the Z axis direction. And connected to the restraining members 410 and 420.

  Next, the second metal end plate 323 will be described in detail with reference to FIG. FIG. 9 is a perspective view showing a detailed configuration of the second metal end plate 323 according to the embodiment of the present invention.

  As shown in FIG. 7B, the second metal end plate 323 is a flat plate member placed on the back side (the Z axis direction minus side) of the first metal end plate 322. The second metal end plate 323 is formed of a metal (conductive) member such as stainless steel or aluminum from the viewpoint of strength or the like, but is formed of any material as long as it has a necessary strength. It may be done.

  As shown in FIG. 9, the second metal end plate 323 has a flat plate portion 371 located on the back side (minus side in the Z-axis direction) of the plurality of power storage elements 100 and projects outward from the flat plate portion 371. And a pair of bent portions 372A and a pair of bent portions 372B which are bent to the plus side in the Z-axis direction. The first metal end plate 322 has holes 374a and 374b provided in each of the pair of bent portions 372B for connecting the second metal end plate 323 and the restraining members 430 and 440 by screwing. .

  As shown in FIG. 9, the flat plate portion 371 is provided on the positive side in the Z-axis direction provided at a position corresponding to the two concave portions 355 of the resin end plate 321 and the two through holes 365 of the first metal end plate 322. It has two protruding portions 375 that protrude. These two convex portions 375 are inserted into the corresponding through holes 365 and concave portions 355 when the first metal end plate 322, the second metal end plate 323, and the resin end plate 321 are assembled. The first metal end plate 322 and the second metal end plate 323 can be positioned with respect to the end plate 321.

  The pair of bent portions 372A are formed so as to protrude on both sides in the short side direction (both sides in the Y axis direction) of the electricity storage device 100 when viewed from the Z axis direction minus side before being bent, and bend on the Z axis direction plus side. And overlapped with the pair of bent portions 362 of the first metal end plate 322.

  Here, each of the pair of bent portions 372 </ b> A is formed so as to avoid a screw used for screwing for connecting the first metal end plate 322 and the restraining members 410 and 420. Specifically, the pair of bent portions 372A are cut out in a U shape from the end on the positive side in the Z-axis direction to positions corresponding to the holes 363a to 363d of the first metal end plate 322. Parts 373a to 373d.

  Thereby, the assembly | attachment of the restraint member 400 (restraint member 410-440) and the clamping member 320 can be performed in the following procedures. Specifically, first, in a state where the plurality of power storage elements 100 and the plurality of spacers 200 are sandwiched between the clamping member 310, the resin end plate 321 and the first metal end plate 322, the restraining members 410 and 420 and the first metal end. The plate 322 is connected by screwing. Thereafter, the second metal end plate 323 is slid in the Z-axis direction plus side and superimposed on the first metal end plate 322, and then the restraining members 430 and 440 and the second metal end plate 323 are connected by screwing. .

  By assembling the restraining member 400 (the restraining members 410 to 440) and the sandwiching member 320 by such a procedure, the restraining member 400 (the restraining members 410 to 440) and the sandwiching member 320 can be easily assembled.

  As described above, the sandwiching member 320 is attached to the restraining member 400 (the restraining members 410 to 420), and sandwiches the plurality of power storage elements 100 together with the sandwiching member 310.

  Here, the positional relationship between the holding member 320 and the power storage element 100 will be described with reference to FIG. FIG. 10 is a bottom view showing the configuration of the holding member 320 according to the embodiment of the present invention. In addition, in the same figure, the electrical storage element 100 is further shown with the broken line.

  As shown in the figure, the first metal end plate 322 is disposed at the center of the plurality of power storage elements 100 when viewed from the negative side in the Z-axis direction. That is, in the present embodiment, the high rigidity portion AR11 is disposed at a position facing the central portion of the power storage element 100.

  In the power storage element 100, the central portion of the power storage element 100 is likely to expand due to repeated charge and discharge. Therefore, in the present embodiment, by providing first metal end plate 322 at a position facing the central portion of power storage element 100, expansion of power storage element 100 can be more effectively suppressed.

  In the present embodiment, clamping member 320 is arranged on the bottom surface side (Z-axis direction negative side) of power storage device 1.

  Thereby, expansion of power storage element 100 to the bottom surface side (Z-axis direction negative side) of power storage device 1 can be suppressed. Specifically, in the present embodiment, the inner space of the exterior body 10 of the power storage device 1 is smaller toward the bottom side. That is, in the present embodiment, when the exterior body 10 is cut on the XY plane, the region surrounded by the exterior body 10 becomes smaller toward the bottom surface side of the power storage device 1. For this reason, when the holding member 310 and the holding member 320 have the same rigidity, the power storage element 100 is likely to expand toward the bottom surface side.

  Therefore, by disposing the holding member 320 having the high rigidity portion AR11 on the bottom surface side of the power storage device 1, the expansion of the power storage element 100 toward the bottom surface side of the power storage device 1 can be suppressed.

  In the present embodiment, the clamping member 320 is fixed to the exterior body 10 of the power storage device 1. Specifically, the clamping member 320 is fixed to the second exterior body 12 of the power storage device 1 by screwing. Hereinafter, the fixing between the holding member 320 and the exterior body 10 will be described in detail with reference to FIG.

  FIG. 11 is a perspective view showing a state in which the power storage unit 30 having the clamping member 320 and the electric device 40 according to the embodiment of the present invention are attached to the exterior body 10 (second exterior body 12).

  As shown in the figure, the second exterior body 12 is provided with through holes 12a to 12d for fixing the clamping member 320 to the second exterior body 12 (see FIG. 2) by screwing. These through holes 12a to 12d are provided at positions corresponding to the screw holes 301a to 301d of the holding member 320, and screws 13a to 13d for screwing the holding member 320 to the second exterior body 12 are inserted.

  That is, the power storage unit 30 having the clamping member 320 is attached to the second exterior body 12 so that the clamping member 320 is on the bottom surface side (Z-axis direction minus side) of the second exterior body 12 after being assembled with the electric device 40. Be contained. And the said electrical storage unit 30 and the electric equipment 40 are fixed to the 2nd exterior body 12 with the screws 13a-13d from the outer side of the 2nd exterior body 12. FIG.

  As described above, the power storage device 1 according to the present embodiment includes a fixing portion that fixes the holding member 320 to the exterior body 10 (second exterior body 12) from the outside of the exterior body 10 (second exterior body 12). Prepare. The fixing portion corresponds to the screws 13a to 13d in the present embodiment.

  Here, a gap in which the electrolyte leaked from the electricity storage element 100 can be arranged is provided between the electricity storage unit 30 having the clamping member 320 assembled as described above and the exterior body 10 (second exterior body 12). Is formed. Hereinafter, the voids formed in this way will be described in detail with reference to FIG.

  FIG. 12 is a cross-sectional view showing a configuration related to the gap AR21 formed between the clamping member 320 and the second exterior body 12 according to the embodiment of the present invention, (a) is an overall cross-sectional view, (b) ) Is a partially enlarged view of (a).

  As shown in the figure, a gap AR21 is formed between the holding member 320 and the second exterior body 12. Specifically, the space AR <b> 21 is formed between the second metal end plate 323 and the second exterior body 12.

  In the space AR <b> 21, when the electrolytic solution (nonaqueous electrolyte) sealed in the power storage element 100 leaks from the safety valve of the power storage element 100 or the like, the electrolytic solution is accommodated (arranged).

  As described above, the power storage device 1 according to the embodiment of the present invention includes the sandwiching member 310 and the sandwiching member 320 that are disposed so as to sandwich the electrical storage element 100, and the sandwiching member 320 is more than the sandwiching member 310. It has the high rigidity part AR11 with high rigidity.

  As described above, since the clamping member 320 has the high-rigidity portion AR11, the power storage element 100 is more easily expanded to the clamping member 310 side than the clamping member 320 side. Here, for example, when the power storage element 100 expands equally between the sandwiching member 320 side and the sandwiching member 310 side, when the sandwiching member 320 and the exterior body 10 of the power storage device 1 are fixed, the power storage element 100 There is a possibility that the exterior body 10 is deformed or damaged due to the expansion of the electrolyte, and the electrolyte solution leaks to the outside. On the other hand, in this Embodiment, since the electrical storage element 100 becomes easy to expand | swell to the clamping member 310 side, the expansion | swelling to the clamping member 320 side can be suppressed. Therefore, since damage to the exterior body 10 can be prevented, it is possible to suppress a problem that the electrolyte leaks to the outside.

  The sandwiching member 320 in the present embodiment corresponds to the “first sandwiching portion” described in the claims, and the sandwiching member 310 in the present embodiment is the “second sandwiching portion” described in the claims. It corresponds to.

  In addition, according to the embodiment of the present invention, high-rigidity part AR <b> 11 is arranged at a position facing the central portion of power storage element 100.

  Here, in the power storage element 100, the central portion of the power storage element 100 is likely to expand due to repeated charge and discharge. Therefore, by providing the highly rigid portion AR11 at a position facing the central portion of the energy storage device 100, the expansion of the energy storage device 100 can be more effectively suppressed.

  Further, according to the embodiment of the present invention, the clamping member 320 is arranged on the bottom surface side of the power storage device 1.

  According to this, the expansion of the power storage element 100 toward the bottom surface side of the power storage device 1 can be suppressed. Therefore, even when the bottom surface of the power storage device 1 is disposed so as to be in contact with another member, interference between the power storage device 1 and the other member due to the expansion of the power storage element 100 can be suppressed.

  In addition, according to the embodiment of the present invention, the high-rigidity part AR11 is formed by stacking a plurality of members. Therefore, for example, compared with the case where the high-rigidity part AR11 is formed by changing the shape of one member. Thus, the highly rigid portion AR11 can be realized with a small number of steps. That is, the high rigidity part AR11 can be easily formed.

  Further, according to the embodiment of the present invention, the clamping member 320 is fixed to the exterior body 10 of the power storage device 1.

  Here, if the clamping member 320 is fixed to the exterior body 10 of the power storage device 1, the exterior body 10 may be deformed or damaged when the sandwiching member 320 is deformed. On the other hand, in this aspect, the deformation of the clamping member 320 can be suppressed by suppressing the expansion of the power storage element 100 toward the clamping member 320. Therefore, even when the power storage element 100 is expanded, the sandwiching member 320 and the exterior body 10 of the power storage device 1 can be firmly fixed.

  Further, according to the embodiment of the present invention, the clamping member 320 is fixed from the outside of the exterior body 10 of the power storage device 1.

  According to this, by fixing the sandwiching member 320 from the outside of the exterior body 10 of the power storage device 1, it is possible to make the sandwiching member 320 and the exterior body 10 less likely to interfere with the fixing operation. Therefore, the clamping member 320 and the exterior body 10 can be fixed smoothly. That is, it is possible to shorten the process of fixing the clamping member 320 and the exterior body 10.

  In addition, according to the embodiment of the present invention, gap AR <b> 21 in which the electrolyte solution leaking from power storage element 100 can be arranged is formed between sandwiching member 320 and exterior body 10 of power storage device 1.

  According to this, when the electrolytic solution (nonaqueous electrolyte) sealed in the power storage element 100 leaks out, the electrolytic solution (nonaqueous electrolyte) can be disposed in the gap AR21. 1 can be prevented from leaking to the outside.

  The power storage device 1 according to the embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the said embodiment, it was set as the part formed by the several member (1st metal end plate 322 and 2nd metal end plate 323) being piled up as high rigidity part AR11 which the clamping member 320 has. However, the high-rigidity part AR11 only needs to have higher rigidity than the clamping member 310, and is not limited to the configuration of the above embodiment. For example, the sandwiching member 320 may have only one metal end plate. By making the thickness of the metal end plate thicker than the thickness of the metal end plate 312 of the sandwiching member 310, the high-rigidity portion AR11 is formed. It may be realized. Further, the high-rigidity part AR11 may be realized by increasing the number of ribs provided on one metal end plate of the sandwiching member 320.

  In the above embodiment, the high-rigidity portion AR11 is disposed at a position facing the central portion of the power storage element 100. However, the high-rigidity part AR11 may be arranged at a position facing the end portion excluding the central portion. Also by this, the power storage element 100 is easily expanded to the holding member 310 side rather than the holding member 320 side, and thus it is possible to suppress the malfunction of the power storage device 1 caused by the power storage element 100 expanding equally.

  Moreover, in the said embodiment, it demonstrated that the highly rigid part AR11 was arrange | positioned in a part of clamping member 320. FIG. That is, it has been described that a part of the clamping member 320 has higher rigidity than the clamping member 310. However, it is sufficient that the rigidity of the clamping member 320 is higher than the rigidity of the clamping member 310. For example, the high-rigidity part AR11 may be disposed on the entire clamping member 320, and the average rigidity of the clamping member 320 is clamped. The rigidity of the member 310 may be higher than the average rigidity, or the rigidity of each part of the clamping member 320 may be higher than the rigidity of the opposing part of the clamping member 310.

  Further, in the above-described embodiment, it has been described that the holding member 320 disposed on the bottom surface side (Z-axis direction negative side) of the power storage device 1 has the high-rigidity portion AR11. However, the clamping member 310 disposed on the upper surface side (Z-axis direction plus side) of the power storage device 1 may have a highly rigid portion having higher rigidity than the clamping member 320. In this case, the malfunction (for example, deformation | transformation or damage of the 1st exterior body 11 of the electrical storage apparatus 1) by the electrical storage element 100 expanding to the upper surface side of the electrical storage apparatus 1 can be suppressed.

  In the above embodiment, the sandwiching member 320 is described as being fixed to the exterior body 10 of the power storage device 1, but may be placed on the inner wall of the exterior body 10 without being fixed. Even in this case, it is possible to suppress problems such as positional deviation of the power storage element 100 due to the power storage element 100 expanding toward the clamping member 320.

  In the above embodiment, the sandwiching member 320 has been described as being fixed from the outside of the exterior body 10 of the power storage device 1, but the sandwiching member 320 may be secured to the inner wall of the exterior body 10. Good. Also by this, interference between the power storage device 1 and other members due to the expansion of the power storage element 100 can be suppressed.

  Moreover, in the said embodiment, the clamping member 320 and the exterior body 10 of the electrical storage apparatus 1 were demonstrated as being fixed by screwing. However, the clamping member 320 and the exterior body 10 may be fixed by a fixing method other than screwing, for example, fixing by bolting, a part of the clamping member 320 and a part of the exterior body 10 May be fixed by fitting, fixed by adhesion, and the like.

  Moreover, in the said embodiment, the clamping member 310 and the clamping member 320 were demonstrated as another member. However, the clamping member 310 and the clamping member 320 may be different parts of the integrally formed members.

  Moreover, the form constructed | assembled combining each component with which the said embodiment is provided arbitrarily is also contained in the scope of the present invention.

  The present invention can be applied to a power storage device including a plurality of power storage elements.

DESCRIPTION OF SYMBOLS 1 Power storage device 10 Exterior body 11 1st exterior body 12 2nd exterior body 12a-12d, 365 Through-hole 13a-13d Screw 21 Positive electrode external terminal 22 Negative electrode external terminal 30 Power storage unit 40 Electrical equipment 100 Power storage element 110 Container 120 Positive electrode terminal 130 Negative electrode terminal 140 Electrode body 150 Positive electrode current collector 160 Negative electrode current collector 200 Spacer 300, 310, 320 Holding member 301a-301d Screw hole 311, 321 Resin end plate 312 Metal end plate 322 First metal end plate 323 Second metal end Plate 355 Concave part 361, 371 Flat plate part 362, 372A, 372B Bending part 363a-363d, 374a, 374b Hole part 364 Rib 373a-373d Notch part 375 Convex part 400, 410, 420, 430, 440 Flux member 500 bus bar frame 600 busbar AR11 high-rigidity area AR21 gap

Claims (7)

A power storage device including a power storage element,
A first sandwiching portion and a second sandwiching portion arranged to sandwich the power storage element;
The power storage device, wherein the first clamping unit includes a high-rigidity part having higher rigidity than the second clamping unit. The power storage device according to claim 1, wherein the high-rigidity portion is disposed at a position facing a central portion of the power storage element. The power storage device according to claim 1, wherein the first clamping unit is disposed on a bottom surface side of the power storage device. The first clamping part has a plurality of members arranged in an overlapping manner,
The power storage device according to claim 1, wherein the high-rigidity portion is a portion formed by overlapping the plurality of members. The power storage device according to claim 1, wherein the first clamping unit is fixed to an exterior body of the power storage device. The space | gap which can arrange | position the electrolyte solution which leaked from the said electrical storage element is formed between said 1st clamping part and the exterior body of the said electrical storage apparatus. Power storage device. A power storage device including a power storage element,
A first sandwiching portion and a second sandwiching portion arranged to sandwich the power storage element;
The first clamping unit has a higher rigidity than the second clamping unit.

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