JP6665876B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module including one or more power storage elements.

  2. Description of the Related Art A battery pack (power storage pack) including a plurality of battery modules (power storage modules) each containing one or more unit cells (power storage elements) in a module case and housing the plurality of battery modules in a pack case is known. Here, when the charge and discharge of the unit cell are repeatedly performed, the battery module generates heat, and thus it is necessary to cool the battery module.

  For this reason, conventionally, a battery pack capable of cooling a battery module inside a pack case has been proposed (for example, see Patent Document 1). In this battery pack, a heat dissipation member is provided between the module case of the battery module (battery module) and the pack case (battery case) to cool the battery module from outside the module case.

Japanese Patent No. 5109559

  However, in the above-described conventional configuration, although the battery module is cooled, since the cooling is performed from the outside of the module case, there is a problem that the unit cell that is a heat generation source cannot be efficiently cooled. .

  In other words, the heat generated from the unit cell is trapped between the unit cell and the inside of the module case of the battery module, but in the above-described conventional configuration, the unit cell is cooled from the outside of the module case of the battery module. It can only be cooled indirectly. For this reason, in the above-mentioned conventional configuration, the unit cells cannot be cooled efficiently, and if the unit cells cannot be cooled efficiently, the battery module cannot be cooled efficiently.

  SUMMARY An advantage of some aspects of the invention is to provide a power storage module that can efficiently cool a power storage element.

  In order to achieve the above object, in a power storage module according to one embodiment of the present invention, one or more power storage elements including an electrode body formed by winding an electrode plate and the one or more power storage elements are held. A power storage module including a unit module having a module case or a spacer, wherein the power storage element bottom surface is a bottom surface of at least one of the one or more power storage elements, and the module case faces the power storage element bottom surface. Alternatively, a first protruding portion protruding from at least one of the power storage device bottom surface and the first surface is provided so that a first space is formed by the first surface that is the surface of the spacer.

  According to this, the power storage module is configured to protrude from at least one of the power storage element bottom surface and the first surface such that a first space is formed by the power storage element bottom surface and the first surface of the module case or the spacer. It has a protrusion. Accordingly, heat generated from the power storage element is radiated through the first space formed by the first protrusion, so that the power storage element held by the module case or the spacer can be efficiently cooled.

  Further, the first protruding portion may include a protruding portion arranged at a position corresponding to at least two of four corners of the bottom surface of the power storage element.

  According to this, since the projecting portions are formed at positions corresponding to at least two of the four corners of the bottom surface of the storage element, when the storage element is held in the module case or the spacer, the four corners of the bottom surface of the storage element are formed. The power storage element can be supported at at least two of them. Therefore, the power storage element can be stably held by the module case or the spacer.

  Further, the first protruding portion, when viewed from the normal direction of the power storage element bottom surface, is surrounded by the first space in the power storage element bottom surface, and extends in the longitudinal direction of the power storage element bottom surface. It may have a protruding part to be arranged.

  Further, the first protrusion may have a center protrusion disposed at a position corresponding to a center portion of the bottom surface of the power storage element.

  According to this, since the central protruding portion is formed at a position corresponding to the central portion of the bottom surface of the power storage element, when the power storage element is held in the module case or the spacer, the power storage element is placed at the central portion of the bottom surface of the power storage element. Can be supported.

  Further, a power storage element side surface which is a side surface of at least one power storage element of the one or more power storage elements and a second surface which is a surface of the module case or the spacer facing the power storage element side surface. A second protruding portion protruding from at least one of the power storage element side surface and the second surface may be provided so that two spaces are formed.

  According to this, the power storage module is configured to protrude from at least one of the power storage element side surface and the second surface such that a second space is formed by the power storage element side surface and the second surface of the module case or the spacer. A projection is further provided. Accordingly, heat generated from the power storage element is radiated through the second space formed by the second protrusion, so that the power storage element held by the module case or the spacer can be efficiently cooled.

  Further, the first space and the second space may be connected to each other.

  According to this, since the first space on the bottom surface side of the power storage device and the second space on the side surface of the power storage device are connected to each other, heat generated from the power storage device passes through the first space and the second space. Heat is dissipated. Therefore, the heat hardly stays between the storage element and the module case or the spacer, and the storage element can be efficiently cooled.

  Further, a through hole may not be formed in a region of the first surface corresponding to the bottom surface of the power storage element.

  According to this, since no through hole is formed in the portion of the module case or the spacer facing the bottom surface of the power storage element, even if the module case or the spacer is placed on the conductive member, the power storage element and the conductive Insulation between the conductive member and the conductive member can be ensured. That is, even in a configuration in which a through hole is not formed in the module case or the spacer in order to prevent a short circuit between the power storage element and the conductive member, the power storage element can be efficiently cooled.

  The power storage device having the power storage device bottom surface may include a sheet member that covers a periphery of a side surface adjacent to the power storage device bottom surface.

  According to this, since the side surface of the power storage element is covered with the sheet member, heat from the power storage element is more easily radiated from the bottom surface than from the side surface of the power storage element. Therefore, by dissipating heat through the first space formed on the bottom surface side of the power storage element, the power storage element can be efficiently cooled.

  The power storage module may include a plurality of the unit modules, and the power storage module may further include a flat member on which the plurality of the unit modules are mounted.

  According to this, by mounting the plurality of unit modules on the flat plate member, the plurality of unit modules can be aligned and arranged, so that the cooling medium for cooling the plurality of unit modules can flow smoothly. .

  Further, the plurality of unit modules may be electrically connected to unit modules arranged adjacent to each other.

  According to this, by electrically connecting adjacent unit modules, a plurality of unit modules in the power storage module can be easily connected.

  Further, each of the plurality of unit modules has a plurality of the power storage elements, and the plurality of the power storage elements are held in the module case or the spacer. The plurality of storage elements of the unit module may be arranged so as to intersect with the arrangement direction of the plurality of storage elements.

  According to this, since the plurality of unit modules and the plurality of power storage elements are arranged orthogonally, the cooling medium flows between the plurality of power storage elements by flowing the cooling medium in the arrangement direction of the plurality of unit modules. Can be shed.

  The flat member includes a first standing wall provided at one end in the arrangement direction of the plurality of unit modules, and a second standing wall provided at the other end in the arrangement direction. An opening communicating with the first space may be provided in the second standing wall.

  Here, the first upright wall and the second upright wall are provided for fixing the plurality of unit modules to the flat member, but when the cooling medium flows in the arrangement direction of the plurality of unit modules, the first upright wall and the second upright wall are provided. The flow of the cooling medium may be blocked by the second standing wall. For this reason, by providing an opening communicating with the first space in the first standing wall and the second standing wall, when the cooling medium flows in the arrangement direction of the plurality of unit modules, the cooling medium passes through the opening and passes through the opening. It can flow into and out of a space.

  In addition, a cooling device that allows a cooling medium to flow into the module case of each of the plurality of unit modules may be further provided.

  According to this, since the power storage module is provided with a cooling device that allows a cooling medium to flow into each module case, heat stored in each unit module is radiated to efficiently cool each unit module. can do.

  The cooling device may be arranged at a position facing an end unit module in the arrangement direction of the plurality of unit modules.

  According to this, by arranging the cooling device at a position facing the unit module at the end in the arrangement direction of the plurality of unit modules, the cooling medium can flow in the arrangement direction. It can be cooled by passing through a medium.

  Further, the module case included in each of the plurality of unit modules has a side surface portion having a plurality of openings formed therein, and the side surface portion is a column partitioning the plurality of openings, and It may have a pillar portion extending in a direction intersecting with the arrangement direction of the modules.

  Here, when the large opening is opened in the side surface of the module case, heat from the power storage element is easily released to the outside of the module case, but the strength of the module case is reduced by the large opening. Therefore, the strength of the module case can be improved because the side surface of the module case has the pillar.

  Further, the column portion is formed on each of a pair of opposed side surfaces of the module case, and each column formed on the pair of opposed side surfaces is an array of the plurality of unit modules. It may be provided at different positions in the direction.

  Here, if the column portions of the pair of side portions of the module case are arranged at the same position in the arrangement direction, the cooling portion is formed by overlapping the column portions when the two module cases are arranged adjacent to each other. The flow of the medium in the arrangement direction is blocked by the pillar. Therefore, by providing the pillars at different positions in the arrangement direction, the cooling medium can flow smoothly without obstructing the flow of the cooling medium flowing in the arrangement direction by the pillars.

  A power storage module including a unit module including one or more power storage elements and a spacer holding the one or more power storage elements, wherein a bottom surface of at least one power storage element of the one or more power storage elements is provided. Projecting from at least one of the power storage element bottom surface and the first surface such that a first space is formed by a certain power storage element bottom surface and a first surface which is a surface of the spacer facing the power storage element bottom surface. May be provided.

  According to the power storage module of the present invention, the power storage element can be efficiently cooled.

FIG. 2 is a perspective view illustrating an appearance of the power storage module according to the embodiment of the present invention. FIG. 3 is an exploded perspective view showing components when the power storage module according to the embodiment of the present invention is disassembled. FIG. 2 is an exploded perspective view showing each component when the unit module according to the embodiment of the present invention is disassembled. FIG. 2 is a perspective view showing the power storage element according to the embodiment of the present invention as seen through the inside. FIG. 2 is a perspective view showing an appearance when the electric storage element according to the embodiment of the present invention is viewed from below. It is a perspective view showing composition of a case main part concerning an embodiment of the invention. It is a top view when the case main body which concerns on embodiment of this invention is seen from above. FIG. 4 is a plan view when a state in which a power storage element is arranged inside a case main body according to the embodiment of the present invention is viewed from above. It is sectional drawing which expands and shows the state with which the electric storage element was arrange | positioned inside the case main body which concerns on embodiment of this invention. It is sectional drawing which expands and shows the state with which the electric storage element was arrange | positioned inside the case main body which concerns on embodiment of this invention. 1 is a perspective view illustrating a configuration of a power storage pack including a power storage module according to an embodiment of the present invention. FIG. 13 is a perspective view illustrating an appearance when a power storage element according to Modification Example 1 of the embodiment of the present invention is viewed from below. It is sectional drawing which expands and shows the state with which the electric storage element was arrange | positioned inside the case main body which concerns on the modification 1 of embodiment of this invention. It is sectional drawing which expands and shows the state with which the electric storage element was arrange | positioned inside the case main body which concerns on the modification 1 of embodiment of this invention. FIG. 13 is a perspective view illustrating an appearance when a power storage element according to Modification 2 of the embodiment of the present invention is viewed from below.

  Hereinafter, a power storage module according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, and the like shown in the following embodiments are merely examples, and do not limit the present invention. In addition, among the components in the following embodiments, components not described in the independent claims indicating the highest concept are described as arbitrary components.

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

  FIG. 1 is a perspective view illustrating an appearance of a power storage module 1 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing components when the power storage module 1 according to the embodiment of the present invention is disassembled.

  In these drawings, the Z-axis direction is shown as an up-down direction, and hereinafter, the Z-axis direction will be described as an up-down direction. However, depending on the use mode, the Z-axis direction may not be up-down direction. The axial direction is not limited to the vertical direction. The same applies to the following figures.

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

  As shown in these drawings, the power storage module 1 includes a module group 10 having a plurality of unit modules 11, 12, and 13, a lower connecting member 20, an upper connecting member 30, and a cooling device 40. Note that the power storage module 1 may have a configuration including only one unit module.

  The module group 10 includes a plurality of unit modules 11, 12, and 13 arranged in a line in the X-axis direction. Further, the unit module 11 is provided with a positive electrode external terminal cover 11a which is a cover for a positive external terminal described later and a negative external terminal cover 11b which is a cover for a negative external terminal described later. The power storage module 1 charges electricity from the outside and discharges electricity to the outside via the positive external terminal in the positive external terminal cover 11a and the negative external terminal in the negative external terminal cover 11b.

  The unit modules 11, 12, and 13 are rectangular modules in which one or more power storage elements are housed in a module case 14, and have the same configuration. Further, the positive terminals and the negative terminals of the adjacent unit modules among the unit modules 11, 12, and 13 are electrically connected, so that all the storage elements in the unit modules 11, 12, and 13 are connected in series. Have been. The detailed configuration of the unit modules 11, 12, and 13 will be described later.

  The lower connecting member 20 and the upper connecting member 30 are members for connecting the plurality of unit modules 11, 12, and 13, and the lower connecting member 20 is a lower connecting member, and the upper connecting member 30 is an upper connecting member. It is. That is, the unit modules 11, 12, and 13 are connected by fixing the unit modules 11, 12, and 13 so as to sandwich them between the lower connecting member 20 and the upper connecting member 30.

  Specifically, the lower connecting member 20 and the upper connecting member 30 are flat members, and are formed of a conductive member such as a metal. Thereby, the unit modules 11, 12, and 13 can be firmly and stably fixed. Usually, it is difficult to coat the surfaces of the lower connecting member 20 and the upper connecting member 30 with insulation, and therefore, the lower connecting member 20 and the upper connecting member 30 are conductive members.

  The module case 14 of each of the plurality of unit modules 11, 12, and 13 is placed on the lower connecting member 20.

  Here, the lower connecting member 20 has a bottom 21, a first standing wall 22, and a second standing wall 23. The bottom 21 is a flat member on which the plurality of unit modules 11, 12, and 13 are placed. The first standing wall 22 is a standing wall provided at one end in the arrangement direction of the plurality of unit modules 11, 12, and 13, and the second standing wall 23 is a standing wall provided at the other end in the arrangement direction. That is, the first standing wall 22 is a wall provided to rise from one end of the bottom 21 in the arrangement direction, and the second standing wall 23 is a wall provided to rise from the other end of the bottom 21 in the arrangement direction. It is.

  The first standing wall 22 has an opening 22a, and the second standing wall 23 has an opening 23a. The opening 22a is a rectangular through hole formed in the center of the first standing wall 22. The openings 23 a are three rectangular through holes formed in the center of the second standing wall 23 and arranged in the Y-axis direction.

  Here, the opening 22a and the opening 23a are openings communicating with a first space 110b described later. That is, since the opening 22a and the opening 23a are formed, the first space 110b is not obstructed by the first standing wall 22 and the second standing wall 23, and the power storage module 1 is passed through the opening 22a and the opening 23a. Is connected to the outside.

  The openings 22a and 23a need not be rectangular through holes, but may be circular or triangular through holes, rectangular or semicircular notches, or the like. It doesn't matter. Further, the numbers of the openings 22a and the openings 23a are not limited to the above numbers.

  The cooling device 40 is a cooling fan that is arranged on the side of the module group 10 on the plus side in the X-axis direction and that allows a cooling medium to flow into the module group 10. That is, the cooling device 40 is disposed at a position facing the unit module 13 at the end in the arrangement direction of the plurality of unit modules 11, 12, and 13. Then, the cooling device 40 sucks in external air as a cooling medium from the end face of the module group 10 on the negative side of the X axis, and sends the air into the module case 14 of each of the plurality of unit modules 11, 12, and 13. Let it flow in. Then, the cooling device 40 discharges the air from the end surface on the X axis plus side of the module group 10 and discharges the air from the back surface of the cooling device 40.

  The cooling device 40 may have a configuration in which external air is sucked in from the end face on the X axis plus side of the module group 10 and the air is discharged from the end face on the X axis minus side of the module group 10. The cooling medium that the cooling device 40 causes to flow into the module group 10 is not limited to air, but may be cold air cooled by a cooler or the like. Further, in the present embodiment, cooling device 40 has two fans, but the number of fans that cooling device 40 has is not limited. The cooling device 40 need not be a fan as long as it allows the cooling medium to flow into the module group 10.

  Next, a detailed configuration of the unit modules 11, 12, and 13 included in the module group 10 will be described. Since the unit modules 11, 12 and 13 have the same configuration, the unit module 11 will be described below, and the description of the configuration of the unit modules 12 and 13 will be omitted.

  FIG. 3 is an exploded perspective view showing each component when the unit module 11 according to the embodiment of the present invention is disassembled.

  As shown in the figure, the unit module 11 includes a module case 14 including a case main body 100 and a lid 700, and a plurality of power storage elements 200 housed in the module case 14 (four power storage elements 200 in the figure). And a regulating member 300, a bus bar 430, and a substrate 600. The number of power storage elements 200 housed in module case 14 is not limited to a plurality, and a configuration in which only one power storage element 200 is housed may be employed.

  The module case 14 is a rectangular (box-shaped) container that forms an exterior body of the unit module 11. The module case 14 arranges the plurality of power storage elements 200, the board 600, and the like at predetermined positions, and protects the plurality of power storage elements 200, the board 600, and the like from impacts. The module case 14 is made of an insulating material such as a resin such as polycarbonate, for example, and prevents the power storage element 200 and the substrate 600 from contacting an external metal member or the like.

  Here, the module case 14 has a case body 100 and a lid 700. The case body 100 is a bottomed rectangular cylindrical member that forms the body of the module case 14. The lid 700 is a member that constitutes a lid of the module case 14, and is a flat rectangular member that closes the opening of the case body 100.

  Specifically, a plurality of power storage elements 200, regulating members 300, and bus bars 430 are arranged in this order inside case main body 100, and the opening of case main body 100 is closed by lid 700. In this way, by arranging the plurality of heavy electric storage elements 200 at the bottom, the stability of the unit module 11 is improved. The detailed configuration of the case body 100 will be described later.

  Here, the plurality of power storage elements 200 are arranged inside the case body 100 in the Y-axis direction. That is, the plurality of power storage elements 200 are arranged such that the arrangement direction intersects (orthogonal in the present embodiment) the arrangement direction of the plurality of unit modules 11, 12, and 13. In other words, the arrangement direction of the plurality of unit modules 11, 12, 13 intersects (orthogonal in the present embodiment) the arrangement direction of the plurality of power storage elements 200 included in each unit module 11, 12, 13. Are located in

  The regulating member 300 is a flat rectangular member disposed above the plurality of power storage elements 200. The regulating member 300 is made of, for example, an insulating material such as a resin. Here, regulating member 300 is a member that regulates the position of a plurality of power storage elements 200 in case body 100. Specifically, regulating member 300 is fitted inside case main body 100, and fixes the plurality of power storage elements 200 to case main body 100 by pressing down the plurality of power storage elements 200 from above.

  The substrate 600 is placed on the regulating member 300. Thus, regulating member 300 has a function of fixing power storage element 200 to case main body 100 and also functions as a mounting table for substrate 600.

  The bus bar 430 is a member arranged above the regulating member 300. Bus bar 430 is a conductive member such as a metal, and electrically connects a plurality of power storage elements 200 to each other. Specifically, bus bar 430 connects a positive terminal or a negative terminal of one power storage element 200 to a negative terminal or a positive terminal of another power storage element 200 in adjacent power storage elements 200.

  In addition, the unit module 11 is provided with a positive external terminal 410 disposed in the positive external terminal cover 11a and a negative external terminal 420 disposed in the negative external terminal cover 11b. The positive external terminal 410 and the negative external terminal 420 are electrode terminals that allow the power storage module 1 to charge electricity from the outside and discharge electricity to the outside. That is, the power storage module 1 charges electricity from the outside and discharges electricity to the outside via the positive external terminal 410 and the negative external terminal 420.

  The substrate 600 can acquire, monitor, and control the state of the plurality of power storage elements 200 and is connected to the plurality of power storage elements 200 by the wiring 440. Here, wiring 440 is a lead wire connecting positive electrode terminal 230 or negative electrode terminal 240 of power storage element 200 and substrate 600. Note that the wiring 440 is not shown in FIG.

  Specifically, the board 600 is a control board for monitoring the charge state and the discharge state (battery state such as voltage and temperature) of the plurality of power storage elements 200. The board 600 is provided with, for example, a control circuit (not shown) for performing the monitoring, controlling on / off of a relay, and communicating with other devices.

  The substrate 600 is arranged on the regulating member 300 and is arranged so as to be covered by the lid 700. That is, the substrate 600 is disposed so as to be protected by the regulating member 300 and the lid 700 by being sandwiched between the regulating member 300 and the lid 700. In addition, as described above, by integrating the electrical components on the upper part, the assemblability and maintenance of the power storage module 1 are improved.

  Next, the configuration of power storage element 200 will be described in detail.

  FIG. 4 is a perspective view showing power storage element 200 according to the embodiment of the present invention as seen through the inside. FIG. 5 is a perspective view showing the appearance of power storage element 200 according to the embodiment of the present invention when viewed from below.

  The storage element 200 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, is a nonaqueous electrolyte secondary battery such as a lithium ion secondary battery. . The storage element 200 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery or a capacitor.

  First, as shown in FIG. 4, power storage element 200 includes a container 210, a positive terminal 230 and a negative terminal 240, and container 210 includes a container lid 220 as an upper wall. Further, inside the container 210, an electrode body 250, a positive electrode current collector 260, and a negative electrode current collector 270 are arranged. Note that a liquid such as an electrolytic solution is sealed inside the container 210, but illustration of the liquid is omitted.

  The container 210 is composed of a case body having a rectangular cylindrical bottom with metal and a bottom, and a metal container lid 220 closing an opening of the case body. Further, the container 210 can be hermetically sealed by, for example, welding the container lid 220 and the housing body after housing the electrode body 250 and the like inside. The material of the container 210 is not particularly limited, but is preferably a weldable metal such as stainless steel or aluminum.

  As shown in FIG. 5, the container 210 includes an insulating sheet member 211 covering the periphery of the power storage element side surfaces 210a and 210b, and an insulating sheet member 212 covering the power storage element bottom face 210c. Here, power storage element side surface 210a is the long side surface of container 210, power storage element side surface 210b is the short side surface of container 210, and power storage element bottom surface 210c is the bottom surface of container 210.

  That is, the sheet member 212 is an insulating sheet that covers the power storage element bottom surface 210c, protects the power storage element bottom surface 210c, prevents damage, and ensures insulation. The sheet member 211 protects the power storage element side faces 210a and 210b by covering the periphery of the power storage element side faces 210a and 210b which are the side faces adjacent to the power storage element bottom face 210c without covering the power storage element bottom face 210c. An insulating sheet for preventing sticking and ensuring insulation.

  With such a configuration, a gap is formed between the sheet member 211 and the sheet member 212, which is located around the power storage element bottom surface 210c. Note that the sheet member 211 and the sheet member 212 do not need to have insulating properties, and even in this case, the effect of preventing damage can be obtained.

  Returning to FIG. 4, the electrode body 250 is a power generation element that includes a positive electrode, a negative electrode, and a separator and can store electricity. Specifically, the electrode body 250 is a wound-type electrode body formed by winding the layers arranged so that the separator is sandwiched between the positive electrode and the negative electrode so that the whole becomes an oval shape. It is an electrode body. In addition, the electrode body 250 may be a laminated electrode body in which flat electrode 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-shaped conductive positive current collector foil made of aluminum or an aluminum alloy, and the negative electrode is a long sheet 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 strip-shaped 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 power storage element 200 are not particularly different from those conventionally used, and known materials can be appropriately used as long as the performance of the power storage element 200 is not impaired. The type of electrolyte (non-aqueous electrolyte) sealed in the container 210 is not particularly limited as long as the performance of the storage element 200 is not impaired, and various types can be selected.

  The positive electrode terminal 230 is an electrode terminal electrically connected to the positive electrode of the electrode body 250 via the positive electrode current collector 260, and the negative terminal 240 is connected to the negative electrode of the electrode body 250 via the negative electrode current collector 270. Are connected to the container lid 220. That is, the positive electrode terminal 230 and the negative electrode terminal 240 lead the electricity stored in the electrode body 250 to the space outside the power storage element 200, and also store the electricity in the electrode body 250 inside the space inside the power storage element 200. Is a metal electrode terminal for introducing the electrode.

  Specifically, of the plurality of power storage elements 200 provided in power storage module 1, positive electrode terminal 230 of power storage element 200 arranged on positive electrode external terminal 410 side is connected to positive electrode external terminal 410, and negative electrode of power storage element 200 Terminal 240 is connected to positive electrode terminal 230 of adjacent power storage element 200. Similarly, of the plurality of power storage elements 200, the negative electrode terminal 240 of the power storage element 200 arranged on the negative electrode external terminal 420 side is connected to the negative electrode external terminal 420, and the positive electrode terminal 230 of the power storage element 200 Connected to negative electrode terminal 240 of element 200. In addition, a positive electrode terminal 230 or a negative electrode terminal 240 of another power storage element 200 is connected to a negative electrode terminal 240 or a positive electrode terminal 230 of an adjacent power storage element 200.

  The positive electrode current collector 260 is a member provided between the positive electrode of the electrode body 250 and the side wall of the container 210 and having conductivity and rigidity electrically connected to the positive electrode terminal 230 and the positive electrode. The positive electrode current collector 260 is formed of aluminum, similarly to the positive electrode current collector foil of the positive electrode. The negative electrode current collector 270 is disposed between the negative electrode of the electrode body 250 and the side wall of the container 210, and has conductivity and rigidity electrically connected to the negative electrode terminal 240 and the negative electrode of the electrode body 250. It is a member. The negative electrode current collector 270 is made of copper, similarly to the negative electrode current collector foil of the negative electrode.

  Next, the case body 100 of the module case 14 will be described in detail.

  FIG. 6 is a perspective view showing a configuration of case main body 100 according to the embodiment of the present invention. FIG. 7 is a plan view when the case body 100 according to the embodiment of the present invention is viewed from above. FIG. 8 is a plan view of a state where power storage element 200 is arranged inside case body 100 according to the embodiment of the present invention when viewed from above.

  9A and 9B are cross-sectional views showing, on an enlarged scale, a state where power storage element 200 is arranged inside case main body 100 according to the embodiment of the present invention. Specifically, FIG. 9A is an enlarged cross-sectional view illustrating a part on the Y axis minus side when the case main body 100 and the electric storage element 200 illustrated in FIG. 8 are cut along the AA cross section. FIG. 9B is a cross-sectional view illustrating, on an enlarged scale, a portion on the Y-axis minus side when the case main body 100 and the electric storage element 200 illustrated in FIG. 8 are cut along a BB cross section.

  As shown in these drawings, the case body 100 is a bottomed rectangular cylindrical member having a case bottom part 110, a case side part 120, and a partition part 130, and having an opening formed in the upper part. Then, a plurality of power storage elements 200 are inserted and housed through the opening in the upper part of case body 100.

  In the present embodiment, power storage element 200 is housed in case body 100 such that container lid 220 faces upward (Z-axis plus direction). That is, the power storage inside the case main body 100 is such that the power storage element bottom surface 210c of the power storage element 200 faces the case bottom surface portion 110, and the power storage element side surfaces 210a and 210b of the power storage device 200 face the case side surface portion 120 and the partition portion 130. The element 200 is housed.

  The case bottom part 110 is a bottom part of the case main body 100 and is a rectangular and flat part. The case side surface portion 120 is a quadrangular cylindrical portion including four rectangular and flat side surfaces that cover four sides of the case bottom surface portion 110. The partition part 130 is a rectangular and flat part for partitioning the plurality of power storage elements 200 arranged inside the case main body 100.

  In order to radiate the heat generated from the electric storage element 200 to the outside of the case main body 100, a plurality of rectangular openings are formed in the case side surface 120 in a ring shape along the inner circumference. Note that the opening formed in the case side surface 120 is not limited to a rectangular shape.

  Here, the case side surface portion 120 has pillar portions 120c to 120f that partition the plurality of openings. The pillar portions 120c to 120f are pillar-shaped portions extending in a direction (Z-axis direction) intersecting with the arrangement direction (X-axis direction) of the plurality of unit modules 11, 12, and 13.

  That is, each of the pillars 120c to 120f is arranged between adjacent ones of the plurality of openings. In other words, each of the pillar portions 120c to 120f is arranged so as to divide the opening formed in the case side surface portion 120, and is provided on both sides of each of the pillar portions of the pillar portions 120c to 120f. , An opening is formed.

  The pillar portions 120c and 120d are elongated portions formed on each of a pair of opposed side surface portions of the four side surface portions of the case side surface portion 120 of the module case 14. The pillars 120c and 120d formed on the pair of opposed side surfaces are provided at different positions in the arrangement direction of the plurality of unit modules 11, 12, and 13. That is, the pillar portions 120c and 120d are provided at different positions in the X-axis direction so as not to overlap with the pillar portions of the adjacent module cases 14.

  The pillars 120e and 120f are elongated portions formed on each of the other pair of facing side surfaces among the four side surfaces of the case side surface 120. And each pillar part 120e, 120f is provided in the same position in the Y-axis direction. Accordingly, the column portions of the adjacent module cases 14 are arranged so as to overlap, so that a cooling medium such as air can flow smoothly in the arrangement direction of the plurality of unit modules 11, 12, and 13.

  In the present embodiment, each of the pillars 120c and 120d has one pillar-shaped portion, and each of the pillars 120e and 120f has two pillar-shaped portions. Is not limited.

  Further, partition portion 130 is formed to be lower (height in the Z-axis direction) than power storage device 200 so that heat generated from power storage device 200 can be easily led to the opening of case side surface portion 120. I have. This also allows a cooling medium, such as air, to flow smoothly between the adjacent storage elements 200 in the arrangement direction (X-axis direction) of the plurality of unit modules 11, 12, and 13.

  The case body 100 has a first protrusion 100a and a second protrusion 100b.

  First protruding portion 100a is a protruding portion that protrudes from at least one of power storage device bottom surface 210c and case bottom portion 110 so that a space is formed between power storage device bottom surface 210c of case 200 and power storage device bottom surface 210c. is there. In the present embodiment, the first protrusion 100a is a protrusion protruding from the case bottom 110, and the four protrusions 111, the four corner protrusions 112, and the center protrusion 113 formed on the case bottom 110 are formed by the first protrusion 100a. Have.

  That is, as shown in FIG. 9A, the first protrusion 100a (four corner protrusion 111 and center protrusion 113 in the figure) is at least one of one or more power storage elements 200 arranged inside case body 100. A projecting portion that projects from the first case surface 110a such that the first space 110b is formed by the energy storage device bottom surface 210c of the two energy storage devices 200 and the first case surface 110a.

  Here, first case surface 110a is a surface of module case 14 facing power storage element bottom surface 210c. That is, the first case surface 110a is the upper surface (the surface on the Z-axis plus side) of the case bottom portion 110.

  Further, an opening such as a through hole or a notch is not formed in a region of first case surface 110a corresponding to power storage element bottom surface 210c. That is, the opening is not formed in a region of case bottom 110 immediately below power storage element bottom 210c. Note that an opening may be formed in a region of the case bottom 110 that is not directly below the power storage element bottom 210c, but in order to ensure insulation between the power storage element 200 and the lower connection member 20, It is preferable that no opening is formed in the entire case bottom 110.

  Four corner protrusions 111 are rectangular protrusions arranged at positions corresponding to the four corners of power storage element bottom surface 210c of power storage element 200. That is, the four corner protruding portions 111 have four protruding portions with respect to one power storage element 200, and are formed corresponding to all the power storage elements 200 arranged inside the case main body 100.

  The four-corner protrusion 112 is a rectangular protrusion disposed between two adjacent four-corner protrusions 111. In the present embodiment, one or two protrusions between the four corners are formed between the two protrusions 111, but three or more protrusions may be formed. Absent.

  Central projecting portion 113 is a projecting portion arranged at a position corresponding to a central portion of power storage device bottom surface 210c of power storage device 200. The central protruding portion 113 has three rod-shaped protruding portions extending in the longitudinal direction (X-axis direction) of the power storage device bottom surface 210c with respect to one power storage device 200, and is disposed inside the case main body 100. It is formed corresponding to all storage elements 200. Note that the central projection 113 does not have to have three projections.

  The shape of the four-corner protrusion 111 and the four-corner protrusion 112 has a rectangular shape when viewed from above (the Z-axis plus side), but is not limited to a rectangular shape, and may be circular or elliptical. Alternatively, the shape may be an oval shape. The shape of the central projecting portion 113 has an oval shape when viewed from above (from the Z axis plus side), but is not limited to an oval shape, and may be an elliptical shape, a circular shape, a rectangular shape, or the like. It may be.

  Further, the projecting heights (heights in the Z-axis direction) of the four-corner projecting portion 111, the four-corner projecting portion 112, and the central projecting portion 113 are formed to be the same height. That is, in a state where the electric storage element 200 is disposed inside the case main body 100, the upper surface (the surface on the positive side of the Z axis) of the four corner projecting portion 111, the four It is formed so as to be in surface contact with power storage element bottom surface 210c.

  In the present embodiment, the four-corner protrusion 111, the four-corner protrusion 112, and the center protrusion 113 are formed integrally with the case bottom 110, but the four-corner protrusion 111, the four-corner protrusion 112, and the center protrusion Any one of the protrusions 113 may be configured separately from the case bottom 110.

  The second protruding portion 100b is formed such that a space is formed between the power storage element side surfaces 210a, 210b of the power storage element 200 and the case side surface portion 120 or the partition portion 130, so that a space is formed. 130 and a protrusion protruding from at least one of them. In the present embodiment, the second protruding portion 100 b is a protruding portion that protrudes from the case side portion 120 and the partition portion 130, and is formed on the side protruding portions 121 and 122 formed on the case side portion 120 and the partition portion 130. And a projected partition 131.

  That is, as shown in FIGS. 9A and 9B, the second protrusion 100b (the side protrusion 121 and the partition protrusion 131 in FIG. 9) is one of the one or more power storage elements 200 arranged inside the case body 100. The protrusions protruding from the second case surfaces 120a, 130a such that the second spaces 120b, 130b are formed by the power storage device side surfaces 210a, 210b of the at least one power storage device 200 and the second case surfaces 120a, 130a. is there.

  Here, the second case surfaces 120a and 130a are surfaces of the module case 14 facing the power storage element side surfaces 210a and 210b. That is, the second case surface 120a is a side surface of the case side surface portion 120, and the second case surface 130a is a side surface of the partition portion 130.

  The first space 110b and the second spaces 120b and 130b are connected and formed. That is, the first space 110b and the second spaces 120b and 130b are not closed spaces, and the first space 110b and the second spaces 120b and 130b are connected to each other.

  The first space 110b communicates with the opening 22a of the first standing wall 22 and the opening 23a of the second standing wall 23 shown in FIG. That is, the first space 110b and the second spaces 120b and 130b are connected to the outside of the power storage module 1 via the openings 22a and 23a.

  Specifically, of the three openings partitioned by the pillar 120 e formed on the case side surface 120 of the module case 14 of the unit module 11, the center opening and the opening 22 a formed on the first standing wall 22. Are arranged adjacent to each other, whereby the space in the central opening and the space in the opening 22a communicate with each other. Further, three openings formed by the column 120 f formed on the case side surface 120 of the module case 14 of the unit module 13 and three openings 23 a formed on the second standing wall 23 are arranged adjacent to each other. Thus, the space in the three openings and the space in the opening 23a communicate with each other. Thus, the first space 110b and the second spaces 120b and 130b communicate with the spaces in the openings 22a and 23a, and are connected to the space outside the power storage module 1.

  The side projections 121 and 122 are rectangular projections formed around the inner surface of the case side 120, and the partition projections 131 are rectangular projections formed on both side surfaces of the partition 130. is there. That is, the side protruding portions 121 and 122 and the partition protruding portion 131 are formed over the entire side surface so as to surround the entire side surface of all the power storage elements 200 arranged inside the case main body 100.

  The shapes of the side protruding portions 121 and 122 and the partition protruding portion 131 are not limited to a rectangular shape, but may be a column shape protruding inward from the case side portion 120 in a cylindrical shape, a truncated cone shape, or a truncated pyramid shape. The shape may be a cone, a pyramid, or the like.

  Further, the protrusion heights (heights in the X-axis or Y-axis direction) of the side protrusions 121 and 122 are formed to be the same height, and the protrusion height of the partition protrusion 131 (the height in the Y-axis direction) ) Are formed to have the same height. That is, in a state where the power storage element 200 is disposed inside the case main body 100, the side surface protrusions 121 and 122 and the partition protrusion 131 have their tip surfaces in surface contact with the power storage element side 210 a or 210 b of the power storage element 200. Is formed.

  In the present embodiment, the side projections 121 and 122 are formed integrally with the case side 120, but one of the side projections 121 and 122 is separate from the case side 120. It may be composed of Further, in the present embodiment, partition protruding portion 131 is formed integrally with partition portion 130, but partition protruding portion 131 may be formed separately from partition portion 130.

  Next, an example of using the power storage module 1 will be described. FIG. 10 is a perspective view illustrating a configuration of a power storage pack 2 including a power storage module 1 according to the embodiment of the present invention.

  As shown in FIG. 1, the power storage pack 2 is a large-sized power supply device in which a plurality of (for example, 10 to 40) battery modules 1 are arranged, and a battery used for power storage use, large-sized power supply use, and the like. It is a pack. The power storage pack 2 includes the plurality of power storage modules 1 and a pack case 2a that accommodates the plurality of power storage modules 1.

  Then, the high-voltage power storage pack 2 is configured by electrically connecting the positive external terminal 410 and the negative external terminal 420 of the adjacent power storage modules 1 among the plurality of power storage modules 1. The number of power storage modules 1 provided in power storage pack 2 is not particularly limited.

  As described above, according to power storage module 1 according to the embodiment of the present invention, first space 110b is formed by power storage element bottom surface 210c of power storage element 200 and first case surface 110a of module case 14. And a first projecting portion 100a projecting from the first case surface 110a. Thereby, the heat generated from the power storage element 200 is radiated through the first space 110b formed by the first protrusion 100a, so that the power storage element 200 disposed inside the module case 14 is efficiently cooled. be able to.

  Therefore, power storage element 200 can be cooled, so that power storage module 1 can be cooled without externally cooling power storage module 1 in pack case 2a of power storage pack 2 shown in FIG.

  Further, since the side surface of the power storage element 200 is covered with the sheet member 211, heat from the power storage element 200 is more easily radiated from the bottom surface than from the side surface of the power storage element 200. Therefore, by dissipating heat through the first space 110b formed on the bottom surface side of the power storage element 200, the power storage element 200 can be efficiently cooled.

  In addition, since four corner protruding portions 111 are formed at positions corresponding to the four corners of power storage element bottom surface 210c, when power storage element 200 is arranged in module case 14, power storage element 200 is placed at four corners of power storage element bottom face 210c. Can be supported. Therefore, power storage element 200 can be stably mounted in module case 14.

  In addition, since central projection 113 is formed at a position corresponding to the center of power storage element bottom surface 210c, when power storage element 200 is arranged in module case 14, the power storage element is positioned at the center of power storage element bottom face 210c. 200 can be supported. For this reason, it is possible to prevent the central portion of the power storage element bottom surface 210 c from expanding in the module case 14, and to stably mount the power storage element 200 in the module case 14.

  Further, power storage module 1 has second case surfaces 120a, 130b formed such that second spaces 120b, 130b are formed by power storage device side surfaces 210a, 210b of power storage device 200 and second case surfaces 120a, 130a of module case 14. It further includes a second projecting portion 100b projecting from 130a. Thereby, the heat generated from the power storage element 200 is radiated through the second spaces 120b and 130b formed by the second protrusion 100b, so that the power storage element 200 disposed inside the module case 14 can be efficiently moved. Can be cooled.

  Further, since the first space 110b on the side of the storage element bottom surface 210c and the second spaces 120b, 130b on the side of the storage element side 210a, 210b are formed so as to be connected to each other, the heat generated from the storage element 200 is generated by the first space 110b. The heat is dissipated through the second space 120b and the second space 120b. Therefore, the heat is unlikely to be trapped between the power storage device 200 and the module case 14, and the power storage device 200 can be efficiently cooled.

  Further, since no through hole is formed in a portion of the module case 14 facing the power storage element bottom surface 210c, even when the module case 14 is placed on a conductive member, the power storage element 200 and the conductive member Insulation between them can be secured. That is, even if the through hole is not formed in module case 14 in order to prevent a short circuit between power storage element 200 and the conductive member, power storage element 200 can be efficiently cooled.

  The power storage module 1 includes a conductive lower connection member 20 on which the plurality of unit modules 11, 12 and 13 are connected and the module case 14 is placed. Since the through hole is not formed in the portion facing the power storage device, insulation between the power storage element 200 and the lower connecting member 20 can be ensured. In other words, even if the module case 14 must be placed on the conductive lower connecting member 20 due to the difficulty of applying the insulating coating to the lower connecting member 20, the electric storage element 200 The electric storage element 200 can be efficiently cooled while preventing a short circuit between the power storage element 200 and the lower connection member 20.

  In addition, since the plurality of unit modules 11, 12, and 13 are placed on the bottom 21 of the lower connecting member 20, which is a flat member, the plurality of unit modules 11, 12, and 13 can be arranged in a line. The cooling medium that cools the plurality of unit modules 11, 12, and 13 can flow smoothly.

  Further, by electrically connecting adjacent unit modules, the plurality of unit modules 11, 12, and 13 in the power storage module 1 can be easily connected.

  In addition, since the plurality of unit modules 11, 12, and 13 and the plurality of power storage elements 200 are arranged orthogonally, the flow of the cooling medium in the arrangement direction of the plurality of unit modules 11, 12, and 13 allows the plurality of power storage devices to be stored. The cooling medium can flow between the elements 200.

  Further, a first standing wall 22 and a second standing wall 23 are provided for fixing the plurality of unit modules 11, 12 and 13 to the bottom 21 of the lower connecting member 20 which is a flat member. When the cooling medium flows in the arrangement direction of 11, 12, and 13, the flow of the cooling medium may be blocked by the first standing wall 22 and the second standing wall 23. For this reason, by providing the openings 22a and 23a communicating with the first space 110b in the first standing wall 22 and the second standing wall 23, when the cooling medium flows in the arrangement direction of the plurality of unit modules 11, 12 and 13, The cooling medium can flow into and out of the first space 110b through the openings 22a and 23a.

  In addition, since the power storage module 1 includes the cooling device 40 that allows the cooling medium to flow into each module case 14, the heat stored in each of the unit modules 11, 12, and 13 is released, and each unit module 11, 12, and 13 is radiated. Modules 11, 12, and 13 can be efficiently cooled.

  That is, since the cooling medium flows into the vicinity of the second protruding portion 100b by the cooling device 40, the hot air flowing from the first space 110b through the second spaces 120b and 130b is flowed by the cooling medium, thereby improving heat radiation. be able to.

  In addition, by disposing the cooling device 40 at a position facing the unit module 13 at the end in the arrangement direction of the plurality of unit modules 11, 12, and 13, the cooling medium can flow in the arrangement direction. The cooling medium can be passed through the unit modules 11, 12, and 13 for cooling.

  In the case side surface 120 of the module case 14, when a large opening is open, heat from the power storage element 200 is easily released to the outside of the module case 14. However, the strength of the module case 14 is reduced by the large opening. descend. For this reason, the case side part 120 of the module case 14 has the pillar parts 120c to 120f, so that the strength of the module case 14 can be improved.

  Further, if the column portions 120c and 120d of the pair of side surface portions of the case side surface portion 120 of the module case 14 are arranged at the same position in the arrangement direction of the plurality of unit modules 11, 12 and 13, two module cases When the fourteen are arranged adjacent to each other, the pillars overlap each other, so that the flow of the cooling medium in the arrangement direction is blocked by the pillars. For this reason, by providing the pillar portions 120c and the pillar portions 120d at different positions in the arrangement direction, the flow of the cooling medium flowing in the arrangement direction is not interrupted by the pillar portions 120c or 120d, so that the cooling medium can smoothly flow. Can be flushed.

(Modification 1)
Next, a first modification of the above embodiment will be described. FIG. 11 is a perspective view showing the appearance of power storage element 201 according to Modification 1 of the embodiment of the present invention when viewed from below. FIGS. 12A and 12B are cross-sectional views showing, on an enlarged scale, a state in which power storage element 201 is arranged inside the case main body according to the first modification of the embodiment of the present invention. Specifically, FIG. 12A is a diagram corresponding to FIG. 9A in the above embodiment, and FIG. 12B is a diagram corresponding to FIG. 9B in the above embodiment.

  As illustrated in FIG. 11, power storage element 201 includes a container 280 instead of container 210 of power storage element 200 in the above embodiment. The container 280 has power storage element side surfaces 280a and 280b and a power storage element bottom surface 280c, and a first protrusion 281 is formed on the power storage element bottom surface 280c. That is, container 280 has a configuration in which a protrusion is formed on bottom surface 210c of power storage element 210 of power storage element 200 in the above embodiment.

  Note that the container 280 has an insulating sheet member covering the periphery of the power storage element side surfaces 280a and 280b and an insulating sheet member covering the power storage element bottom surface 280c. Since it is the same as power storage element 200 in the above embodiment, detailed description is omitted.

  First projecting portion 281 is a projecting portion projecting from power storage element bottom surface 280c so that a space is formed between power storage element bottom surface 280c of power storage element 201 and case bottom portion 110, and has four corner projecting portions 282 and a central projecting portion. 283.

  That is, as shown in FIG. 12A and FIG. 12B, the first protrusion 281 (four corner protrusion 282 and the center protrusion 283 in FIG. 12) is one of the one or more power storage elements 201 arranged inside the case main body. A protrusion protrudes from the power storage element bottom surface 280c such that the first space 110d is formed by the power storage element bottom surface 280c of at least one power storage element 201 and the first case surface 110c. Here, the first case surface 110c is a surface of the module case facing the power storage element bottom surface 280c.

  Four corner protrusions 282 are rod-shaped protrusions arranged at positions corresponding to the four corners of power storage element bottom surface 280c of power storage element 201. That is, the four corner projecting portions 282 have four projecting portions for one power storage element 201 and are formed for all the power storage elements 201 arranged inside the case main body. Note that the shape of the four corner projecting portions 282 is not limited to a rod shape.

  Central projecting portion 283 is a projecting portion arranged at a position corresponding to the central portion of power storage element bottom surface 280c of power storage element 201. The central protruding portion 283 has one rod-shaped protruding portion extending in the longitudinal direction (X-axis direction) of the power storage device bottom surface 280c with respect to one power storage device 201, and is disposed inside the case main body. Are formed with respect to the storage element 201. The central projecting portion 283 may have two or more projecting portions, and the shape is not limited to a rod shape.

  Further, the protrusion heights (heights in the Z-axis direction) of the four corner protrusions 282 and the center protrusion 283 are formed to be the same height. That is, in a state where the electric storage element 201 is arranged inside the case main body, the four corner protruding portions 282 and the central protruding portion 283 have the lower surfaces (the surfaces on the negative side of the Z axis) on the first case surface 110 c of the case bottom surface portion 110. It is formed so as to make surface contact.

  In this modification, the four corner protrusions 282 and the center protrusion 283 are formed integrally with the container 280, but one of the four corner protrusions 282 and the center protrusion 283 is different from the container 280. It may be composed of the body.

  As described above, according to the power storage module according to Modification 1 of the embodiment of the present invention, first space 110d is formed by power storage element bottom surface 280c of power storage element 201 and first case surface 110c. A first protruding portion 281 protruding from the power storage element bottom surface 280c is provided. Thus, heat generated from the power storage element 201 is radiated through the first space 110d formed by the first protrusion 281. Therefore, the power storage element 201 disposed inside the module case can be efficiently cooled. Can be.

(Modification 2)
Next, a second modification of the above embodiment will be described. FIG. 13 is a perspective view showing an appearance when power storage element 202 according to Modification 2 of the embodiment of the present invention is viewed from below.

  As shown in the drawing, the electric storage element 202 includes a container 290 instead of the container 280 of the electric storage element 201 in the first modification. The container 290 has power storage element side surfaces 290a and 290b and a power storage element bottom surface 290c, and a first protrusion 291 is formed on the power storage element bottom surface 290c, and a second protrusion 294 is formed on the power storage element side surfaces 290a and 290b. Is formed. That is, container 290 has a configuration in which projecting portions are formed on power storage element side surfaces 280a and 280b of container 280 of power storage element 201 in the first modification.

  First projecting portion 291 is a projecting portion projecting from power storage element bottom surface 290c so that a space is formed between power storage element bottom surface 290c of power storage element 202 and case bottom portion 110, and has four corner projecting portion 292 and central projecting portion. 293. The first protrusion 291 (four-corner protrusion 292 and center protrusion 293) is the same as the four-corner protrusion 282 and center protrusion 283 in the first modification, and therefore, detailed description is omitted. Further, the other configuration of the power storage element 202 is similar to that of the above-described embodiment or Modification Example 1, and thus detailed description is omitted.

  Second projecting portion 294 is a projecting portion projecting from power storage element side surfaces 290a, 290b such that a space is formed between power storage element side surfaces 290a, 290b of power storage device 202 and case side surface portion 120 or partitioning portion 130.

  That is, the second protrusion 294 faces the storage element side surfaces 290a and 290b of at least one of the one or more storage elements 202 disposed inside the case main body and the storage element side surfaces 290a and 290b. The projecting portion projects from the power storage element side surfaces 290a and 290b so that a second space is formed between the module case surface and the second case surface.

  Further, second projecting portion 294 has a rectangular long side projecting portion 295 projecting from power storage element side surface 290a, and a rectangular short side projecting portion 296 projecting from power storage element side surface 290b. That is, second projecting portion 294 has long side projecting portion 295 and short side projecting portion 296 forming a plurality of projecting portions formed over the entire periphery of power storage element side surfaces 290a, 290b. The shape and number of the long side projection 295 and the short side projection 296 are not limited to the shape and number shown in FIG.

  The protruding height (height in the Y-axis direction) of the long side protruding portion 295 is formed to be the same height, and the protruding height (height in the X-axis direction) of the short side protruding portion 296 is: It is formed so as to have the same height. In other words, the long side projection 295 and the short side projection 296 are formed such that the front end surface thereof comes into surface contact with the case side surface 120 or the partitioning portion 130 in a state where the power storage element 202 is arranged inside the case main body. ing.

  The long side projection 295 and the short side projection 296 may be formed integrally with the container 290, or one of the long side projection 295 and the short side projection 296 may be connected to the container 290. It may be configured separately.

  As described above, according to the power storage module according to Modification 2 of the embodiment of the present invention, the second space is formed by power storage element side surfaces 290a and 290b of power storage element 202 and the second case surface of the module case. As described above, second storage portion 294 further protruding from power storage element side surfaces 290a and 290b is further provided. Accordingly, heat generated from the power storage element 202 is radiated through the second space formed by the second protrusion 294, so that the power storage element 202 disposed inside the module case can be efficiently cooled. it can.

  As described above, the power storage module according to the embodiment of the present invention and its modified example have been described, but the present invention is not limited to the above-described embodiment and its modified example. In other words, the embodiments and modifications thereof disclosed this time are to be considered in all respects as illustrative 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. Further, a mode constructed by arbitrarily combining the above-described embodiment and the above-described modified examples is also included in the scope of the present invention.

  For example, in the above embodiment and its modifications, the power storage module includes the cooling device 40. However, the power storage module may have a configuration without the cooling device 40. Although the power storage module includes the lower connection member 20 and the upper connection member 30, the power storage module may be configured not to include the lower connection member 20 or the upper connection member 30.

  In the above-described embodiment and its modifications, the lower connecting member 20 and the upper connecting member 30 are formed of a conductive member, but the lower connecting member 20 and the upper connecting member 30 It may be formed of an insulating member such as a resin. In this case, a configuration in which a through hole is formed in a region corresponding to the bottom surface of the power storage element on the first case surface of the module case may be used.

  Further, in the above-described embodiment and the modifications thereof, the power storage element has the sheet member that covers the side surface and the bottom surface. However, the power storage element may have a configuration that does not include the sheet member. .

  In the above-described embodiment and its modifications, the first protrusion has four corner protrusions at positions corresponding to the four corners of the power storage element bottom surface. May be provided at positions corresponding to two or three of the four corners. This also allows the storage element to be supported at at least two of the four corners on the bottom surface of the storage element, so that the storage element can be stably mounted in the module case. Although the first protrusion has the center protrusion at a position corresponding to the center of the bottom surface of the power storage element, the first protrusion may have a structure without the center protrusion. .

  In the above-described embodiment and its modifications, the power storage module is configured such that the first space formed by the first protrusion and the second space formed by the second protrusion are connected. Alternatively, a configuration in which the first space and the second space are not connected may be used. Although the power storage module has the second protrusion, the power storage module may have a structure without the second protrusion.

  Further, in the above-described embodiment and its modifications, the module case is a container in which a power storage element is accommodated, but the module case may be an inter-cell spacer capable of holding the power storage element. .

  Further, in the above embodiment and its modification, the bottom surface of the storage element is the surface on the opposite side of the electrode terminal, but the storage element is turned over, and the short side of the storage element faces the bottom surface of the module case. In such a case, the bottom surface of the storage element is the short side surface of the storage element. In this case, the short side surface of the power storage element may be covered with the sheet member without covering the short side surface of the power storage element with the sheet member.

  The present invention can be applied to a power storage module in which one or more power storage elements are housed in a module case, a power storage pack in which a plurality of power storage modules are housed in a pack case, and the like.

DESCRIPTION OF SYMBOLS 1 Power storage module 2 Power storage pack 2a Pack case 10 Module group 11, 12, 13 Unit module 11a Positive external terminal cover 11b Negative external terminal cover 14 Module case 20 Lower connecting member 21 Bottom 22 First standing wall 22a, 23a Opening 23 First Double standing wall 30 Upper connecting member 40 Cooling device 100 Case main body 100a, 281, 291 First protruding portion 100b, 294 Second protruding portion 110 Case bottom portion 110a, 110c First case surface 110b, 110d First space 111, 282, 292 Four corner protruding part 112 Four corner protruding part 113,283,293 Central protruding part 120 Case side surface part 120a, 130a Second case surface 120b, 130b Second space 120c-120f Column part 121,122 Side surface protruding part 130 Partition part 131 Cut-out protrusions 200, 201, 202 Storage element 210, 280, 290 Container 210a, 210b, 280a, 280b, 290a, 290b Storage element side 210c, 280c, 290c Storage element bottom 211, 212 Sheet member 220 Container cover 230 Positive terminal 240 Negative terminal 250 Electrode body 260 Positive electrode current collector 270 Negative electrode current collector 295 Long side protruding part 296 Short side protruding part 300 Restriction member 410 Positive external terminal 420 Negative external terminal 430 Bus bar 440 Wiring 600 Substrate 700 Lid

Claims (8)

An electricity storage module including a unit module including one or more electricity storage elements having an electrode body formed by winding an electrode plate and a module case or a spacer holding the one or more electricity storage elements,
A first space is formed by a power storage element bottom surface that is a bottom surface of at least one of the one or more power storage elements and a first surface that is a surface of the module case or the spacer facing the power storage element bottom surface. As such, comprising a first protrusion protruding from at least one of the power storage element bottom surface and the first surface,
The electrode body is formed by winding an electrode plate around a winding axis extending in a direction orthogonal to a direction in which the power storage element bottom surface and the first surface face each other,
The power storage module includes a plurality of the unit modules,
Each of the plurality of unit modules has the first protrusion, and is arranged in a longitudinal direction of the power storage element bottom surface,
The power storage module, wherein the first protrusions of each of the plurality of unit modules are arranged at positions overlapping when viewed from a longitudinal direction of a bottom surface of the power storage element . The opening is formed in a surface of the module case or the spacer facing a side surface of at least one of the at least one storage element in a longitudinal direction of the bottom surface of the storage element. The power storage module as described in the above. The power storage module according to claim 1, wherein the first protrusion has a protrusion disposed at a position corresponding to at least two of four corners of the bottom surface of the power storage element. The first protruding portion, when viewed from the normal direction of the power storage element bottom surface, is surrounded by the first space in the power storage element bottom surface, and is disposed so as to extend in the longitudinal direction of the power storage element bottom surface. The power storage module according to any one of claims 1 to 3, further comprising a protruding portion. further,
A second space is formed by a power storage element side surface that is a side surface of at least one of the one or more power storage elements and a second surface that is a surface of the module case or the spacer facing the power storage element side surface. The power storage module according to any one of claims 1 to 4, further comprising: a second protrusion protruding from at least one of the power storage element side surface and the second surface. The power storage module according to claim 5, wherein the first space and the second space are connected and formed. The power storage module according to any one of claims 1 to 6, wherein the power storage element having the power storage element bottom surface includes a sheet member that covers a side surface adjacent to the power storage element bottom surface. The power storage module according to any one of claims 1 to 7 , wherein the power storage module further includes a flat member on which the plurality of unit modules are mounted.

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