JP2018166212A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module which can be miniaturized and which reduces the number of components.SOLUTION: A power storage module according to the present invention includes a power storage cell and a heat-conduction sheet. In the heat-conduction sheet overlaid on the power storage cell and having insulation properties, an uneven structure comprising projections and depressions is provided on at least one principal plane, and elasticity brought about by elastic deformation of the projection is assumed.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage module that can be miniaturized and has a reduced number of parts.

  An assembled battery used for an industrial machine or an on-vehicle vehicle is required to be space-saving and lightweight. In recent years, it has been required to increase the working current with respect to the electric capacity of the assembled battery, and it has become necessary to devise a heat dissipation structure accompanying the heat generation of the cell. Therefore, in the current assembled battery, a heat conductive sheet or the like is often used to transmit the heat of the cell to the heat radiating member, and further, it is often used in combination with a pressure member for fixing the cell (for example, , See Patent Document 1).

  In addition, many assembled batteries are currently clamped and fixed with a metal pressure member in order to withstand vibration and impact when fixing the cell (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 08-321329 JP 2012-084551 A

  However, in the invention described in Patent Document 1, since the heat dissipating member and the pressure member for fixing the cell are combined, there is a possibility that a large assembled battery may be obtained.

  Further, in the case of the invention described in Patent Document 2, a gap is generated between the cell and the structure in the structure considering the component tolerance. When this gap is eliminated and pressure is applied, an adjustment function is provided, resulting in a larger assembled battery.

  In addition, when the pressure member that fixes the cell is a metal, an insulation measure is taken using an insulator. However, in the case of a resin, even if there is no problem in insulation, the strength is inferior, so a complicated structure such as a beam structure is required. The structure must be taken, and as a result, it tends to be large. Further, when heat dissipation is taken into account, the heat transfer path is secured, so that the structure becomes more complex and the number of parts increases.

  In view of the circumstances as described above, an object of the present invention is to provide a power storage module that can be downsized and has a reduced number of parts.

In order to achieve the above object, a power storage module according to one embodiment of the present invention includes a power storage cell and a heat conductive sheet.
The heat conductive sheet is laminated on the power storage cell, has an insulating property, has a concavo-convex structure including a convex portion and a concave portion on at least one main surface, and has elasticity due to elastic deformation of the convex portion.

  According to this structure, a heat conductive sheet has a convex part. Here, when the convex portion is elastically deformed, a repulsive force can be generated in the heat conductive sheet. Thereby, the heat conductive sheet which has a convex part not only conducts the heat accompanying heat_generation | fever of an electrical storage cell, but can press an electrical storage cell. That is, the said heat conductive sheet can be set as the structure which integrated the pressurizing member and heat conductive member which press an electrical storage cell. Therefore, by using the heat conductive sheet, it is possible to provide a power storage module that can be downsized and has a reduced number of parts.

  The protrusions extend in a first direction parallel to the main surface, and are spaced apart from each other via the recess in a second direction that is parallel to the main surface and orthogonal to the first direction. May be.

  According to this configuration, the convex portions extend in the first direction parallel to the main surface and are separated from each other via the concave portions in the second direction. Thereby, since a heat conductive sheet increases the contact area with an electrical storage cell, the heat | fever derived from an electrical storage cell can be efficiently conducted.

  The convex portion may protrude in a third direction orthogonal to the first direction and the second direction.

  According to this configuration, the convex portion is configured to protrude in the third direction. Thereby, the electrical storage cell can be pressed and fixed in the third direction. Specifically, the storage cell is pressed and fixed by utilizing the repulsive force in the third direction due to the convex portion biting into the storage cell and being crushed.

  The convex portion may protrude in a direction inclined in the second direction from a third direction orthogonal to the first direction and the second direction.

  By projecting the convex portion in the direction inclined in the second direction, the direction in which the power storage cell is displaced can be restricted when the power storage module is affected by vibration or the like.

  The convex portion may include convex portions having different inclinations from the third direction in the protruding direction.

  According to this configuration, the convex portion can include convex portions having different inclinations from the third direction of the protruding direction. Thereby, an electrical storage cell will not receive a repulsive force from a convex part to one direction. That is, the convex portion can not only press the storage cell in one direction but also press from the other side.

  The protrusion protrudes in a direction inclined from the third direction to the second direction, and protrudes in a direction inclined from the third direction to the direction opposite to the second direction. And a second convex portion.

  According to this configuration, the protrusion protrudes in the direction inclined from the third direction to the second direction, and protrudes in the direction inclined from the third direction to the direction opposite to the second direction. And a second convex portion to be included. As a result, the storage cell not only receives a repulsive force in a direction inclined from the first convex portion in the second direction, but also repels from the second convex portion in a direction inclined in the direction opposite to the second direction. Since the force is received, the displacement of the storage cell is reduced.

  The direction in which the first protrusion protrudes and the direction in which the second protrusion protrudes may be symmetric with respect to the third direction.

  Since the direction in which the first protrusion protrudes and the direction in which the second protrusion protrudes are symmetric with respect to the third direction, the first protrusion and the second protrusion are separated from the third direction. Inclined in opposite directions at the same angle. Therefore, the repulsive force given to the electricity storage cell from the first convex portion is equivalent to the repulsive force given to the electricity storage cell from the second convex portion. Therefore, since the bias of the pressing force that the power storage cell receives from the heat conductive sheet is eliminated, the occurrence of positional deviation of the power storage cell can be suppressed.

  The convex portion may include a first convex portion and a second convex portion whose height from the main surface is lower than that of the first convex portion.

  According to this configuration, the convex portion can include the first convex portion and the second convex portion whose height from the main surface is lower than that of the first convex portion. Thereby, a convex part can be set as the structure which presses an electrical storage cell mainly with a 1st convex part, and ensures a contact area with an electrical storage cell with a 2nd convex part. Therefore, since the convex portion includes the first convex portion and the second convex portion, the storage cell can be pressed without applying too much weight without reducing the heat transfer efficiency.

  The protrusions extend in a first direction parallel to the main surface, and are spaced apart from each other via the recess in a second direction that is parallel to the main surface and orthogonal to the first direction. May be.

  According to this configuration, the convex portion including the first convex portion and the second convex portion whose height from the main surface is lower than that of the first convex portion extends in the first direction, and the second convex portion It can be set as the structure which mutually spaces apart through a recessed part in a direction. Thereby, since the said contact part increases the contact area with an electrical storage cell, it can conduct the heat | fever derived from an electrical storage cell efficiently not only suppressing the fall of heat transfer efficiency and the excessive press with respect to an electrical storage cell. .

  The convex portion includes a first direction parallel to the main surface and a third direction orthogonal to the second direction that is parallel to the main surface and orthogonal to the first direction. You may protrude in the direction which inclines toward a surface.

  According to this configuration, the convex portion including the first convex portion and the second convex portion whose height from the main surface is lower than that of the first convex portion is configured to be inclined in the direction of the main surface. You can also. This not only suppresses a decrease in heat transfer efficiency and excessive pressure on the storage cell, but also restricts the direction in which the storage cell deviates.

  The heat conductive sheet may be made of silicon rubber.

  When the heat conductive sheet is made of silicon rubber, the elastic force (repulsive force) of the convex portions of the heat conductive sheet is improved, and permanent deformation of the heat conductive sheet is difficult to occur. In other words, the heat conductive sheet can be less deteriorated over time by being made of the same material.

The power storage cell includes a power storage element,
You may provide the exterior film which coat | covers the said electrical storage element and seals with electrolyte solution.

  Generally, a storage cell in which the packaging material is a film is less pressed by a pressure member or the like because the strength of the packaging material is small, but the storage cell according to the present invention has a surface on the side of the heat conductive sheet. Since the entire surface is covered with the heat conductive sheet, even if it is configured to include an exterior film, it can be efficiently pressed and fixed by the heat conductive sheet.

To achieve the above object, a power storage module according to an embodiment of the present invention includes a first power storage cell, a second power storage cell, a heat conductive sheet, a first plate, and a second plate. To do.
The thermal conductive sheet is laminated between the first power storage cell and the second power storage cell, has an insulating property, and has a concavo-convex structure including a convex portion and a concave portion on at least one main surface. It has elasticity by elastic deformation of the part.
The second plate sandwiches the first power storage cell, the second power storage cell, and the heat conductive sheet together with the first plate, and the first power storage element and the second power storage element are They are pressed against each other via a heat conductive sheet.

  According to this configuration, the heat conductive sheet has a convex portion and is laminated between the first power storage cell and the second power storage cell. Here, when the convex portion is elastically deformed, a repulsive force can be generated in the heat conductive sheet. Thereby, the heat conductive sheet having the convex portions can not only conduct heat accompanying the heat generation of the storage cell, but can also press the storage cell toward the first plate and the second plate. That is, the said heat conductive sheet can be set as the structure which integrated the pressurizing member and heat conductive member which press an electrical storage cell. Therefore, by using the heat conductive sheet, it is possible to provide a power storage module that can be downsized and has a reduced number of parts.

  As described above, according to the present invention, it is possible to provide a power storage module that can be downsized and has a reduced number of parts.

It is a perspective view of the electrical storage module which concerns on embodiment of this invention. It is a disassembled perspective view of the same electrical storage module. It is sectional drawing of the same electrical storage module. It is sectional drawing of the electrical storage cell which concerns on embodiment of this invention. It is a perspective view of the heat conductive sheet which concerns on embodiment of this invention. It is a side view of the heat conductive sheet. It is a top view of the heat conductive sheet. It is a side view of the heat conductive sheet. It is a side view of the heat conductive sheet. It is a side view of the heat conductive sheet. It is a side view of the heat conductive sheet. It is a side view of the heat conductive sheet. It is a side view of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is a figure which shows the other structure of the heat conductive sheet. It is sectional drawing of the electrical storage module which concerns on the modification of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Configuration of power storage module]
FIG. 1 is a perspective view of a power storage module 10 according to an embodiment of the present invention. 2 is an exploded perspective view of the power storage module 10, and FIG. 3 is a cross-sectional view. In the following drawings, the X direction, the Y direction, and the Z direction are three directions orthogonal to each other.

  As shown in FIGS. 1 to 3, the power storage module 10 according to the present embodiment includes a first power storage cell 20, a second power storage cell 21, a heat conductive sheet 30, a first plate 40, a second plate 41, and a first insulation. The conductive sheet 50, the second insulating sheet 51, and the support member 60 are provided. 2 and 3, the support member 60 is not shown.

  As shown in FIGS. 2 and 3, the first power storage cell 20 and the second power storage cell 21 are stacked via a heat conductive sheet 30. A first plate 40 is laminated on the opposite side of the first electricity storage cell 20 from the heat conductive sheet 30 via a first insulating sheet 50, and on the opposite side of the second electricity storage cell 21 from the heat conductive sheet 30. The second plate 41 is laminated via the second insulating sheet 51. The first plate 40 and the second plate 41 are supported by the support member 60 while being pressed against each other, and sandwich the first power storage cell 20 and the second power storage cell 21 via the heat conductive sheet 30.

  The 1st electrical storage cell 20 is a cell which can be charged and discharged. FIG. 4 is a schematic diagram showing the structure of the first storage cell 20. As shown in FIG. 4, the first power storage cell 20 includes a power storage element 22, an exterior film 23, a positive electrode terminal 24, and a negative electrode terminal 25.

  As shown in FIG. 4, the electricity storage element 22 includes a positive electrode 26, a negative electrode 27, and a separator 28. The positive electrode 26 and the negative electrode 27 are opposed to each other through the separator 28.

  The positive electrode 26 can be made of a positive electrode material including a positive electrode active material and a binder. The positive electrode active material is, for example, activated carbon. The positive electrode active material can be appropriately changed according to the type of the first storage cell 20. The positive electrode 26 may be formed on a current collector that is continuous with the positive electrode wiring 26a.

  The negative electrode 27 can be made of a negative electrode material including a negative electrode active material and a binder. The negative electrode active material is, for example, a carbon-based material. The negative electrode active material can be appropriately changed according to the type of the first storage cell 20. The negative electrode 27 may be formed on a current collector that is continuous with the negative electrode wiring 27a.

  The separator 28 is disposed between the positive electrode 26 and the negative electrode 27 and allows the electrolytic solution to pass therethrough and prevents (insulates) the contact between the positive electrode 26 and the negative electrode 27. The separator 28 may be a woven fabric, a nonwoven fabric, a synthetic resin microporous film, or the like.

  Although one positive electrode 26 and one negative electrode 27 are provided in FIG. 4, a plurality of each may be provided. In this case, a plurality of positive electrodes 26 and negative electrodes 27 can be alternately stacked via separators 28.

  As shown in FIG. 4, the exterior film 23 covers the power storage element 22 and seals the power storage element 22 together with the electrolytic solution. The exterior film 23 can be, for example, one in which both front and back surfaces of a metal foil are covered with a synthetic resin, and the synthetic resin is heat-sealed at the periphery of the electricity storage element 22 to seal the inside. .

  In general, a storage cell in which the exterior material is a film is difficult to be pressed by a pressure member or the like because the strength of the exterior material is small, but the first energy storage cell 20 and the second energy storage cell according to the present embodiment. 21, the entire surface on the heat conductive sheet 30 side is covered with the heat conductive sheet 30 (see FIG. 3), so even if the exterior material is a film, the first plate 40 is formed by the heat conductive sheet 30. And it can be efficiently pressed and fixed to the second plate 41 side. In addition, the 1st electrical storage cell 20 does not necessarily need to be provided with the exterior film 23, and may be provided with exterior materials, such as a can package.

The electrolytic solution is a solution in which an electrolyte such as SBP · BF ₄ (spirobipyyrolydinium tetrafuloroborate) is dissolved in a nonaqueous solvent such as propylene carbonate, and can be selected according to the type of the first storage cell 20.

  The positive electrode terminal 24 is an external terminal of the positive electrode 26. As shown in FIG. 4, the positive electrode terminal 24 is electrically connected to the positive electrode 26 through the positive electrode wiring 26 a, and is drawn out through the space between the two exterior films 23. The positive electrode terminal 24 can be a foil or a wire made of a conductive material. Ultrasonic welding or the like can be used for joining the positive electrode terminal 24 and the positive electrode wiring 26a.

  The negative electrode terminal 25 is an external terminal of the negative electrode 27. As shown in FIG. 4, the negative electrode terminal 25 is electrically connected to the negative electrode 27 through the negative electrode wiring 27 a, and is drawn out through the space between the two exterior films 23. The negative electrode terminal 25 can be a foil or a wire made of a conductive material. Ultrasonic welding or the like can be used for joining the negative electrode terminal 25 and the negative electrode wiring 27a.

  The kind of the 1st electrical storage cell 20 is not specifically limited, It can be set as a lithium ion capacitor, a lithium ion battery, an electric double layer capacitor, etc. Moreover, the structure of the 1st electrical storage cell 20 is not limited to the structure of FIG. 4, For example, the structure which seals the electrical storage element 22 with the sheet | seat film 23 of 1 sheet may be sufficient.

  The second power storage cell 21 is a cell that can be charged and discharged, and can have the same structure as the first power storage cell 20. Further, the second power storage cell 21 may be a power storage cell having a structure different from that of the first power storage cell 20.

  As shown in FIGS. 1 to 3, the heat conductive sheet 30 is pressed by the first power storage cell 20 and the second power storage cell 21. The heat conductive sheet 30 has a function of conducting heat accompanying the heat generation of the first power storage cell 20 and the second power storage cell 21 to the first plate 40 or the second plate 41.

  The heat conductive sheet 30 can be made of a material having insulating properties, heat conductivity, and a certain level of rigidity (i.e., less susceptible to distortion), such as silicon rubber made of vinyl methyl silicon rubber. However, it is not limited to this material. The heat conductive sheet 30 will be described later.

  As shown in FIGS. 2 and 3, the first plate 40 is laminated on the first insulating sheet 50, and has a function of radiating the heat accompanying the heat generation of the first storage cell 20 and the second storage cell 21. The first plate 40 is made of a metal material, and can be, for example, a metal plate made of aluminum, or may be a metal plate made of copper, nickel, stainless steel, or the like. When the first plate 40 is made of metal, the heat derived from the first power storage cell 20 and the second power storage cell 21 is efficiently dissipated. The thickness of the first plate 40 can be about several mm.

  As shown in FIGS. 2 and 3, the second plate 41 is laminated on the second insulating sheet 51, and has a function of radiating heat accompanying the heat generation of the first storage cell 20 and the second storage cell 21. The second plate 41 can be made of the same material as the first plate 40 and can be about several mm thick.

  As shown in FIGS. 2 and 3, the first insulating sheet 50 is laminated between the first storage cell 20 and the first plate 40. The first insulating sheet 50 is made of an insulating material, and prevents (insulates) contact between the positive electrode terminal 24 and the negative electrode terminal 25 of the first storage cell 20 and the first plate 40. The first insulating sheet 50 can be made of, for example, synthetic resin or synthetic rubber. The thickness of the first insulating sheet 50 can be about several mm.

  As shown in FIGS. 2 and 3, the second insulating sheet 51 is laminated between the second storage cell 21 and the second plate 41. The second insulating sheet 51 prevents (insulates) contact between the second plate 41 and the positive electrode terminal 24 and the negative electrode terminal 25 of the second storage cell 21. The second insulating sheet 51 can be made of the same material as the first insulating sheet 50 and can have a thickness of about several mm.

  The power storage module 10 according to the present embodiment has the above configuration.

[About heat conduction sheet]
The detail of the heat conductive sheet 30 is demonstrated. FIG. 5 is a perspective view of the heat conductive sheet 30. 6 is a side view of the heat conductive sheet 30, and FIG. 7 is a plan view.

  As shown in FIGS. 5 and 6, the heat conductive sheet 30 has a concavo-convex structure including a convex portion 31 and a concave portion 32. The convex portion 31 and the concave portion 32 are provided on at least one main surface 30 a of the heat conductive sheet 30.

  Here, assuming that the X direction is one direction parallel to the main surface 30a, the Y direction is a direction parallel to the main surface 30a and orthogonal to the X direction, and the Z direction is a direction orthogonal to the X direction and the Y direction, the convex portion 31 is As shown in FIGS. 5 to 7, it can be configured to extend in the X direction and be separated from each other via the recess 32 in the Y direction.

  Moreover, the convex part 31 is comprised so that it may protrude in a Z direction, as shown in FIG. In other words, as described above, the convex portion 31 extends in the X direction, that is, has a uniform shape in the X direction, and thus protrudes along the XZ plane (arrow L1 in the drawing).

[Effect of heat conduction sheet]
The heat conductive sheet 30 according to the present embodiment can generate a repulsive force in the heat conductive sheet 30 by the elastic deformation of the convex portion 31.

  Thereby, not only the heat accompanying the heat generation of the first power storage cell 20 and the second power storage cell 21 is conducted, but also the first power storage cell 20 is pressed toward the first plate 40 and the second power storage cell 21 is moved to the second plate. 41 side can be pressed. Therefore, the heat conductive sheet 30 can be configured such that the pressure member that presses the first power storage cell 20 and the second power storage cell 21 and the heat conductive member are integrated. Here, the pressure at which the heat conductive sheet 30 presses the first storage cell 20 and the second storage cell 21 is preferably 0.012 MPa.

  As described above, the heat conductive sheet 30 according to the present embodiment extends in the X direction parallel to the main surface 30a, and protrudes away from each other via the recess 32 in the Y direction parallel to the main surface 30a and orthogonal to the X direction. It can be set as the structure provided with the part 31 (refer FIG. 5 thru | or FIG. 7).

  Thereby, since the heat conductive sheet 30 increases the contact area with the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 via the convex part 31, it originates in the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 efficiently. Heat can be conducted to the first plate 40 or the second plate 41.

  Moreover, as shown in FIG. 6, the convex part 31 is comprised so that it may protrude in the direction of arrow L1, and it presses and fixes the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 to a Z direction. be able to. Specifically, the first power storage cell 20 and the second power storage cell 21 are pressed by using the repulsive force in the Z direction due to the convex portion 31 biting into the first power storage cell 20 or the second power storage cell 21 and being crushed. It will be fixed. Further, as shown in FIG. 6, when the height from the main surface 30a is D1 and the width is D2, the convex portion 31 is adjusted by adjusting D1 and D2, thereby the first power storage cell 20 and the second power storage. The repulsive force that presses the cell 21 can be adjusted.

  Moreover, the heat conductive sheet 30 has insulation. As a result, as shown in FIG. 3, the positive electrode terminal 24 and the negative electrode terminal 25 of the first power storage cell 20 and the second power storage cell 21 are stacked between the first power storage cell 20 and the second power storage cell 21. It is possible to prevent a short circuit of the power storage module 10 due to the positive electrode terminal 24 and the negative electrode terminal 25 coming into contact with each other.

  Furthermore, since the heat conductive sheet 30 is made of silicon rubber made of vinyl methyl silicone rubber, the elastic force (repulsive force) of the convex portion 31 can be improved, and permanent deformation can hardly occur. In other words, the heat conductive sheet 30 can be less deteriorated over time by being made of the same material.

  A general heat conductive sheet presses an electrical storage cell using elastic force derived from rubber elasticity of the material itself. As a result, the permanent set becomes large when used for a long time, and the pressing force disappears after several hours.

  On the other hand, since the heat conductive sheet 30 according to the present invention is made of a material having high hardness and presses the power storage cell using the elastic force of the convex portion 31, the power storage cell is more than a general heat conductive sheet. The repulsive force received from the surface is reduced, and permanent deformation is unlikely to occur.

  8 to 13 are side views of the heat conductive sheet 30 having various structures. As shown in FIG. 8, the convex portion 31 can be configured to project in a direction inclined from the Z direction to the Y direction, as well as the shape shown in FIGS. 5 to 7.

  Specifically, as shown in FIG. 8, when a plane inclined in the Y direction from the arrow L1 that is a plane orthogonal to the main surface 30a is an arrow L2, the convex portion 31 projects in the direction of the arrow L2. can do. Thereby, when the electrical storage module 10 receives the influence of a vibration etc., the direction where the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 shift can be controlled.

  As shown in FIG. 9, the protrusions 31 can have different inclinations from the Z direction in the protruding direction. Specifically, as shown in FIG. 9, when a plane inclined in the Y direction with an inclination different from the arrow L2 from the arrow L1 which is a plane orthogonal to the main surface 30a is an arrow L3, the convex portion 31 is The convex part 31 which protrudes in a direction and the convex part 31 which protrudes in the direction of arrow L3 shall be included.

  Thereby, the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 do not receive a repulsive force from the convex part 31 to one direction. That is, the convex part 31 can not only press the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 in one direction but can also press from the other.

  Moreover, the convex part 31 shall include the convex part 31b which protrudes in the direction inclined in the Y direction from the Z direction, and the convex part 31c which protrudes in the direction inclined in the opposite direction to the Y direction from the Z direction.

  Specifically, as shown in FIG. 10, when a plane inclined in the direction opposite to the Y direction from the arrow L1 that is a plane orthogonal to the main surface 31a is an arrow L4, the convex portion 31b protrudes in the direction of the arrow L2, The convex portion 31c can be configured to project in the direction of the arrow L4.

  Thereby, the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 not only receive the repulsive force from the convex part 31b in the direction inclined in the Y direction, but also in the direction inclined in the direction opposite to the Y direction from the convex part 31c. Since it receives a repulsive force, the positional shift of the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 is reduced.

  In addition, the direction in which the protrusion 31b protrudes and the direction in which the protrusion 31c protrudes can be symmetric with respect to the Z direction. Specifically, as shown in FIG. 10, the angle A1 of the arrow L2 with respect to the arrow L1 that is a plane orthogonal to the main surface 31a and the angle A2 of the arrow L4 are the same angle.

  That is, the convex part 31b and the convex part 31c can be inclined in the opposite direction at the same angle from the Z direction, as shown in FIG. Therefore, the repulsive force applied from the convex portion 31 b to the first power storage cell 20 and the second power storage cell 21 is equivalent to the repulsive force applied from the convex portion 31 c to the first power storage cell 20 and the second power storage cell 21. Therefore, since the bias of the pressing force received by the first storage cell 20 and the second storage cell 21 from the heat conductive sheet 30 is eliminated, it is possible to suppress the occurrence of misalignment between the first storage cell 20 and the second storage cell 21. .

  The convex portion 31 is not limited to the configuration shown in FIGS. 5 to 10, and as shown in FIG. 11, the convex portion 31d and the convex portion 31e whose height from the main surface 30a is lower than the convex portion 31d. Can be included. Here, as shown in FIG. 11, the convex part 31d and the convex part 31e can be set as the structure protruded in the direction of the arrow L1 which is a plane orthogonal to the main surface 30a.

  As shown in FIG. 11, when the height of the convex portion 31d is D3 from the main surface 30a, D3 is a height at which the heat conductive sheet 30 presses the first power storage cell 20 and the second power storage cell 21 with a predetermined pressure. Set to

  As shown in FIG. 11, when the height from the main surface 30a is D4, the protrusion 31e is high enough to secure a contact area between the first storage cell 20 and the second storage cell 21. Is set.

  Therefore, the heat conductive sheet 30 mainly has a configuration in which the first storage cell 20 and the second storage cell 21 are pressed by the convex portion 31d and the contact area with the first storage cell 20 is secured by the convex portion 31e. it can.

  Therefore, the heat conductive sheet 30 has the convex part 31d and the convex part 31e, and can press the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 without overloading, without reducing heat-transfer efficiency. it can.

  Moreover, the convex part 31d and the convex part 31e may adjust the pressing force with respect to the thermal conductivity of the heat conductive sheet 30, and the 1st electrical storage cell 20 and the 2nd electrical storage cell 21 by adjusting the number. it can. Specifically, the ratio of the number of convex portions 31d and convex portions 31e included in the heat conductive sheet 30 is preferably 1: 8.

  Furthermore, the convex part 31d and the convex part 31e can also be set as the structure which inclines in the direction of the main surface 30a, as shown in FIG. Specifically, as shown in FIG. 12, the convex portion 31d and the convex portion 31e protrude in the direction of the arrow L2 that is a plane inclined in the Y direction from the arrow L1 that is a plane orthogonal to the main surface 30a. Can be configured.

  Thereby, not only the decrease in heat transfer efficiency and excessive pressing on the first power storage cell 20 and the second power storage cell 21 are suppressed, but also the direction in which the first power storage cell 20 and the second power storage cell 21 shift is regulated. You can also.

  The shape of the convex part 31d and the convex part 31e is not limited to the structure of FIG.11 and FIG.12, and as shown in FIG. 13, the convex part 31d and the convex part 31e have the inclination from the Z direction which protrudes. Different configurations may be used.

  Specifically, as shown in FIG. 13, the convex portion 31e projects in the direction of an arrow L2 that is a plane inclined in the Y direction from the arrow L1 that is a plane orthogonal to the main surface 31a, and the convex portion 31d It can be set as the structure which protrudes in the direction of arrow L4 which is a plane which inclines in the direction opposite to Y direction from L1. The direction in which the protrusions 31d and 31e protrude is not limited to the configuration shown in FIG. 13, and the protrusion 31d may protrude in the direction of the arrow L2, and the protrusion 31e is in the direction of the arrow L4. May protrude.

  14 to 19 are diagrams showing another structure of the shape of the convex portion 31. FIG. The shape of the convex portion 31 viewed from the X direction (side view of the convex portion 31) is not limited to the configuration shown in FIG. 6, and as shown in FIG. 14 and FIG. can do. Further, the shape seen from the Z direction (plan view of the convex portion 31) is not limited to the configuration shown in FIG. 7, and as shown in FIGS. 16 to 18, the wave shape, the curved shape, and the bending point are shown. It can be a straight line or the like.

  Further, the shape of the convex portion 31 viewed from the Z direction is not limited to the linear shape as shown in FIGS. 7, 16, 17, and 18, but as shown in FIG. Thus, a plurality of independent protrusions 31 may be formed.

  FIG. 20 is a schematic diagram illustrating another structure of the heat conductive sheet 30. As shown in FIG. 20, the convex portions 31 can be provided not only on one side of the heat conductive sheet 30 but also on both sides.

[Modification]
FIG. 21 is a cross-sectional view showing a power storage module 10 according to a modification. In the said embodiment, although the electrical storage module 10 shall have the 1st electrical storage cell 20 and the 2nd electrical storage cell 21, it is not limited to this structure. As shown in FIG. 21, the power storage module 10 can have only the first power storage cell 20, and can also have three or more power storage cells. When the number of storage cells is two or more, the uppermost surface of the plurality of storage cells is stacked on the first insulating sheet 50 and the lowermost surface is stacked on the second insulating sheet 51.

  Moreover, in the said embodiment, although the 1st plate 40 and the 2nd plate 41 shall consist of metals, it can also consist of insulating materials, such as a synthetic resin. In this case, the first insulating sheet 50 and the second insulating sheet 51 may not be provided in the power storage module 10.

DESCRIPTION OF SYMBOLS 10 ... Power storage module 20 ... 1st electrical storage cell 21 ... 2nd electrical storage cell 30 ... Thermal conductive sheet 31 ... Convex part 32 ... Concave part 40 ... 1st plate 41 ... -2nd plate 50 ... 1st insulating sheet 51 ... 2nd insulating sheet 60 ... Support member

Claims (11)

A storage cell;
It is laminated on the electricity storage cell, has an insulating property, and has a concavo-convex structure consisting of a convex portion and a concave portion on at least one main surface, and the convex portion has the first convex portion and the first convex portion than the first convex portion. A heat conductive sheet including a second convex portion having a low height from the main surface and having elasticity by elastic deformation of the convex portion. A first storage cell;
A second storage cell;
It is laminated between the first power storage cell and the second power storage cell, has an insulating property, and has a concavo-convex structure including a convex portion and a concave portion on at least one main surface, A heat conductive sheet including a convex part and a second convex part having a height from the main surface lower than that of the first convex part, and having elasticity by elastic deformation of the convex part;
A first plate;
The first power storage cell, the second power storage cell, and the heat conductive sheet are sandwiched together with the first plate, and the first power storage element and the second power storage element are connected to each other through the heat conductive sheet. A power storage module comprising: a second plate to be pressed. The power storage module according to claim 1 or 2,
The convex portions extend in a first direction parallel to the main surface, and are separated from each other via the concave portions in a second direction that is parallel to the main surface and orthogonal to the first direction. Power storage module. The power storage module according to claim 3,
The convex portion protrudes in a third direction orthogonal to the first direction and the second direction. The power storage module according to claim 3,
The convex portion protrudes in a direction inclined from the third direction orthogonal to the first direction and the second direction to the second direction. The power storage module according to claim 5,
The power storage module, wherein the convex part includes a convex part having different inclinations from the third direction in the protruding direction. The power storage module according to claim 6,
The convex portion protrudes in a direction inclined from the third direction to the second direction, and a convex portion protrudes in a direction inclined from the third direction to the direction opposite to the second direction. And a power storage module. The power storage module according to claim 7,
The direction inclined from the third direction to the second direction and the direction inclined from the third direction to the direction opposite to the second direction are symmetric with respect to the third direction. The power storage module according to claim 3,
The convex portion includes a first direction parallel to the main surface and a third direction orthogonal to the second direction that is parallel to the main surface and orthogonal to the first direction. An electricity storage module that protrudes in a direction inclined toward the surface. The power storage module according to claim 8 or 9, wherein
The heat conductive sheet is a power storage module made of silicon rubber. The power storage module according to claim 10, wherein
The power storage cell includes a power storage element,
A power storage module comprising: an exterior film that covers the power storage element and seals together with the electrolytic solution.

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