JP2016031818A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module that is enhanced in production efficiency.SOLUTION: Plural power storage cells 1 are stacked so that a sheet-like sheet member 2 such as a double-faced tape or the like is interposed not in the form of leaves, but in the form of a continuous sheet between plural power storage cells 1 in a meandering form. That is, the sheet member 2 is meandered and arranged between the respective power storage cells 1 in a direction substantially perpendicular to electrode tabs 3a and 3b not in the form of leaves, but in the form of a continuous sheet. Accordingly, a power storage module 10 can be continuously assembled by using the sheet-like sheet member 2, and the productivity of the power storage module 10 can be enhanced. Furthermore, since the sheet member 2 is disposed between the plural power storage cells 1 not in the form of leaves, but in the form of a meandered sheet, the process can be more simplified as compared with a case using separated sheets, and the production cost of the power storage module 10 can be reduced.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a power storage module.

  A power storage system or power supply device using a storage battery uses a power storage module that has a large energy capacity and can be rapidly charged and discharged. For example, the power storage module is configured by stacking a plurality of power storage cells such as a lithium ion secondary battery, a nickel metal hydride battery, an electric double layer capacitor, and a lithium in capacitor. For example, an energy storage cell of a lithium ion secondary battery is a hermetically sealed electrode laminate in which a positive electrode, a negative electrode, and a separator are alternately laminated in an aluminum laminate film laminate material, and an organic electrolyte containing lithium ions Structure.

  In the storage module, a plurality of storage cells are stacked in the thickness direction, the entire stacked storage cell is fastened and held by an exterior component, and the storage cell electrodes are connected to each other so that the plurality of storage cells are connected in series or in parallel. Is done. In the energy storage module, the position of the contact surface between the energy storage cells is fixed by the displacement prevention member disposed on the contact surface between the energy storage cells, and the occurrence of displacement between the energy storage cells on the contact surface is prevented.

JP 2008-91206 A

  However, in the above-described conventional technology, since the shift prevention member is disposed independently between the respective storage cells, the shift prevention member is cut or punched into a predetermined size. Moreover, when arrange | positioning a slip prevention member on the contact surface of each electrical storage cell, after positioning, a slip prevention member is arrange | positioned on the contact surface of each electrical storage cell. For this reason, in the prior art, since the shift preventing member is arranged between the respective storage cells, smooth progress of the process when stacking the respective storage cells is hindered, and as a result, improvement in the production efficiency of the storage module is reduced. .

  In view of the above-described problems, an example of an embodiment aims to improve the production efficiency of a power storage module.

  The power storage module according to an example of the embodiment includes, for example, a plurality of substantially flat storage batteries stacked and a sheet member. The sheet member is folded back along one of the opposite end portions of each storage battery between the adjacent stacks of the plurality of storage batteries and continuously disposed between the stacks of the plurality of storage batteries, Hold.

  According to an example of the embodiment, it is possible to improve the production efficiency of the power storage module.

FIG. 1 is a perspective view illustrating an external appearance of the power storage module according to the first embodiment. FIG. 2 is a perspective view illustrating an appearance of the electricity storage cell according to the first embodiment. FIG. 3 is a diagram illustrating an external appearance of the power storage module according to the first embodiment in the I direction. FIG. 4 is a diagram illustrating an appearance in the II direction of the power storage module according to the first embodiment. FIG. 5 is a diagram illustrating an appearance of the power storage module according to the first embodiment when the sheet member is arranged as viewed from the I direction. FIG. 6 is a diagram illustrating an appearance of the power storage module according to the first embodiment when the sheet member is arranged as viewed from the II direction. FIG. 7A is a diagram illustrating a process of stacking power storage cells by arranging sheet members in the power storage module according to the first embodiment. FIG. 7B is a diagram illustrating a process of stacking power storage cells by arranging sheet members in the power storage module according to the first embodiment. FIG. 7C is a diagram illustrating a process of stacking power storage cells by arranging sheet members in the power storage module of Embodiment 1. FIG. 8 is a flowchart illustrating a stacking procedure of the power storage modules according to the first embodiment. FIG. 9 is a diagram illustrating an appearance of the power storage module according to the first embodiment when the sheet member is arranged as viewed from the I direction. FIG. 10 is a diagram illustrating an external appearance of the power storage module according to the first embodiment when the sheet member is disposed as viewed from the II direction. FIG. 11 is a diagram illustrating an external appearance of the power storage module according to the third embodiment, in which the sheet member is arranged as viewed from the I direction. FIG. 12 is a diagram illustrating an external appearance of the power storage module according to the third embodiment when the sheet member is arranged as viewed from the II direction. FIG. 13 is an explanatory diagram showing the relationship of the size of each part in the power storage module of the third embodiment.

  Hereinafter, a power storage module according to an example of an embodiment will be described with reference to the drawings. Each of the following embodiments is merely an example and does not limit the disclosed technology. The following embodiments can be appropriately combined within a consistent range. In each embodiment, each position such as “up” and “down” shown with reference to the drawings merely indicates a relative position shown in each drawing, and does not indicate an absolute position. In each embodiment, the same code | symbol is provided to the same component and description is abbreviate | omitted in the case of later mention.

[Embodiment 1]
(Configuration of power storage module of Embodiment 1)
FIG. 1 is a perspective view illustrating an external appearance of the power storage module according to the first embodiment. FIG. 2 is a perspective view illustrating an appearance of the electricity storage cell according to the first embodiment. As illustrated in FIG. 1, the power storage module 10 of Embodiment 1 includes a plurality of stacked power storage cells 1 and an exterior portion 20 that covers the stacked plurality of power storage cells 1. As will be described later, the plurality of power storage cells 1 are stacked between each power storage cell 1 with a sheet-like sheet member 2 (see FIG. 4) such as a double-sided tape, which is a displacement prevention member, interposed therebetween. Although FIG. 1 shows an example in which eight power storage cells 1 are stacked, the number of stacked layers is not limited to this.

  The power storage module is also called a battery module or a capacitor module. The storage cell is also referred to as a storage battery. Moreover, since the electrical storage module is a combination of a plurality of stacked storage batteries, it is also called an assembled storage battery.

  The storage cell 1 is a flat type storage battery in which an organic electrolyte containing lithium ions and an electrode laminate are sealed, for example, an airtight flexible packaging material such as an aluminum laminate film material in which an aluminum foil is laminated with a resin film. It has a container 5. The storage cell 1 may be a rectangular can type storage battery in which the container 5 is formed of a metal material such as aluminum or stainless steel. The electrical storage cell 1 has an electrode tab 3 a and an electrode tab 3 b that are arranged outward from a pair of opposite sides of the container 5. One of the electrode tab 3a and the electrode tab 3b is a positive electrode, and the other is a negative electrode.

  In addition, since the electrode stack and the organic electrolyte are sealed in the container 5, the storage cell 1 has a current collector cell surface 5 a that is raised near the center of the surface of the container 5. Moreover, the electrical storage cell 1 has the cell surface 5b which is a surface on the opposite side to the cell surface 5a in the container 5. FIG. The power storage module 10 is stacked on the cell surface 5a of the power storage cell 1 so that the cell surface 5b of the power storage cell 1 to be stacked is opposed. In addition, although the electrical storage cell 1 of Embodiment 1 has a shape in which only the cell surface 5a is raised, and the cell surface 5b has a flat plate shape, this is not limiting, and both the cell surface 5a and the cell surface 5b are raised. The shape which forms a collector may be sufficient.

  The exterior portion 20 includes a pair of opposite sides of the container 5 in which the electrode tab 3a and the electrode tab 3b of each storage cell 1 are not provided, the cell surface 5a of the uppermost storage cell 1 and the storage cell 1 of the lowermost layer. The plurality of stacked storage cells 1 are packaged so as to surround the cell surface 5b. The exterior portion 20 includes an end plate 11a, an end plate 11b, a bracket 12a, and a bracket 12b.

  The end plate 11 a is provided along the cell surface 5 a of the uppermost storage cell 1 of the stacked storage cells 1. In addition, a bracket provided along a pair of opposite sides of the container 5 provided with the electrode tab 3a and the electrode tab 3b of each storage cell 1 provided along the cell surface 5b of the lowermost storage cell 1 12a and a bracket 12b.

  In the exterior portion 20, the end plate 11 a and the bracket 12 a and the bracket 12 b are fastened by, for example, screwing of the screws 13. Moreover, in the exterior part 20, the end plate 11b, the bracket 12a, and the bracket 12b are fastened by, for example, screwing of the screws 13, and the opening and the cross section are formed in a rectangular cylindrical shape.

  The plurality of stacked power storage cells 1 are accommodated in the cylindrical part of the exterior part 20. In addition, the connection between the end plate 11a and the end plate 11b and the bracket 12a and the bracket 12b in the exterior portion 20 is not limited to fastening by screwing of the screws 13, but various known techniques such as reppet fastening may be used. . That is, the plurality of stacked storage cells 1 are fixed by receiving a fastening pressure by the exterior part 20.

  FIG. 3 is a diagram illustrating an external appearance of the power storage module according to the first embodiment in the I direction. The I direction is a direction indicated by an arrow I toward the power storage module 10 shown in FIG. As shown in FIG. 3, for example, in the power storage module 10, the electrode tabs 3 a of the lowermost power storage cell 1 and the second power storage cell 1 from the lowermost layer are connected by the terminal connection portion 4 a. One of the electrode tabs 3a of the lowermost storage cell 1 and the electrode tab 3a of the second storage cell 1 from the lowermost layer is a positive electrode, and the other is a negative electrode.

  Moreover, the electrode tabs 3b of the 2nd electrical storage cell 1 from the lowest layer and the 3rd electrical storage cell 1 from the lowest layer are connected by the terminal connection part 4b. One of the electrode tab 3a of the lowermost storage cell 1 and the electrode tab 3a of the second storage cell 1 from the lowermost layer is the positive electrode, the other is the negative electrode, and the electrode of the same storage cell 1 One of the tab 3a and the electrode tab 3b is a positive electrode, and the other is a negative electrode. That is, in the storage cell 1, the electrode tab 3 a and the electrode tab 3 b arranged in the vertical direction in FIG. 3 are a positive electrode and a negative electrode (or a negative electrode and a positive electrode), respectively, and are stacked in the thickness direction of the storage cell 1. Cells 1 are electrically connected in series.

  As shown in FIG. 3, in the exterior part 20, the end plate 11 a and the end plate 11 b and the bracket 12 a are fastened by, for example, screwing of screws 13. Although not shown in FIG. 3, the fastening of the end plate 11 a and the end plate 11 b and the bracket 12 b (see FIG. 4) in the exterior portion 20 is the same.

  The terminal connection portion 4a and the terminal connection portion 4b are bus bars. However, the connection between the electrode tabs 3b and between the electrode tabs 3b is not limited to the bus bar, and may be a connection by welding.

  FIG. 4 is a diagram illustrating an appearance in the II direction of the power storage module according to the first embodiment. The II direction is a direction indicated by an II arrow toward the power storage module 10 shown in FIG. As shown in FIG. 4, a plurality of power storage cells 1 are formed by interposing a sheet-like sheet member 2 such as a double-sided tape between each power storage cell 1 in a continuous state, not in a single sheet, in a folded state. 1 are stacked.

  The sheet member 2 is for holding the stacked state of the storage cells 1. Therefore, the sheet member 2 is a double-sided tape having adhesive layers on both sides. However, the sheet member 2 is not limited to the double-sided tape, and may be a material that stabilizes the stacked state of the storage cells 1 to be stacked, for example, another material such as an elastomer sheet having friction surfaces on both sides. Further, the sheet member 2 may be one in which an adhesive layer is applied to both surfaces of a base material, or may be one in which only the adhesive layer is processed into a sheet without a base material.

  Furthermore, the sheet member 2 may have electrical insulation. This is to improve the insulation between the two stacked power storage cells 1. Generally, the exterior of the electricity storage cell 1 is covered with an electrically insulating material such as resin. However, an assembled battery in which a large number of the storage cells 1 are stacked and electrically connected has insufficient insulation performance and requires an insulation treatment. In the first embodiment, when a member having electrical insulation is used as the sheet member 2, the storage cell in the storage module 10 can be efficiently and without requiring a separate process while stabilizing the stacked state of the stacked storage cells 1. The insulation performance between the ones can be improved.

  As shown in FIG. 4, for example, in the sheet member 2, the electrode tab 3 a and the electrode tab 3 b of the storage cell 1 are provided between the lowermost storage cell 1 and the second storage cell 1 from the lowermost layer. The container 5 is provided from the opposite side of the opposite side of the container 5 toward the side of the bracket 12a. And the sheet | seat member 2 is bend | folded along the edge | side by the side of the bracket 12a of the 2nd electrical storage cell 1 from the lowest layer laminated | stacked immediately on the lowermost electrical storage cell 1 in the bracket 12a side.

  And the sheet | seat member 2 is the container 5 in which the electrode tab 3a and the electrode tab 3b of the electrical storage cell 1 are not provided between the 2nd electrical storage cell 1 from the lowest layer, and the 3rd electrical storage cell 1 from the lowest layer. It is provided from the opposite side opposite the bracket 12a side toward the bracket 12b side. And the sheet | seat member 2 is bend | folded along the edge | side by the side of the bracket 12a of the 3rd electrical storage cell 1 from the lowest layer laminated | stacked directly on the 2nd electrical storage cell 1 from the lowest layer in the bracket 12b side.

  In this way, the sheet member 2 is folded between the storage tabs 1 in a substantially perpendicular direction with respect to the electrode tab 3a and the electrode tab 3b in a connected state instead of a single wafer. Since the sheet member 2 is provided in a direction substantially orthogonal to the electrode tab 3a and the electrode tab 3b, the electrode tab 3a and the electrode tab 3b (see FIG. 3) are connected to the terminal connection portions 4a even if they are folded in a connected state. And when electrically connected by the terminal connection part 4b, it does not interfere with a connection part.

  Furthermore, the power storage module 10 may be housed in an outer case made of resin, metal, or the like. In addition, although the electrical storage module 10 has circuits, such as voltage measurement of the electrical storage cell 1, temperature measurement, and state monitoring, illustration and description are abbreviate | omitted.

(Arrangement Mode of Sheet Member of Embodiment 1)
FIG. 5 is a diagram illustrating an appearance of the power storage module according to the first embodiment when the sheet member is arranged as viewed from the I direction. FIG. 5 is a view of the power storage module 10 as viewed from the I direction in FIG. 1, and the illustration of the bracket 12 a is omitted in FIG. 3. The sheet member 2 disposed between the storage cells 1 and folded in a connected state is bent along the side of the storage cell 1 on the bracket 12a side and the side of the bracket 12b side.

  For this reason, as shown in FIG. 5, when viewed from the I direction, the bent portion of the sheet member 2 is the second, fourth, sixth,... Located in. Note that when viewed from the direction opposite to the I direction, the bent portion of the sheet member 2 is located on the bracket 12b side edge of the third, fifth, seventh,...

  FIG. 6 is a diagram illustrating an appearance of the power storage module according to the first embodiment when the sheet member is arranged as viewed from the II direction. FIG. 6 is a view of the power storage module 10 viewed from the II direction in FIG. As shown in FIG. 6, the electrode tab 3a of the 2nd and 3rd electrical storage cell 1 from the lowest layer is connected by the terminal connection part 4a. Similarly, the electrode tab 3a of the 4th and 5th electrical storage cell 1 from the lowest layer is connected by the terminal connection part 4a. The same applies to the sixth or more power storage cells 1 from the lowest layer.

(Sheet member placement process)
7A to 7C are diagrams illustrating a process of stacking power storage cells by arranging sheet members in the power storage module according to the first embodiment. 7A to 7C are views of the power storage module 10 as viewed from the II direction (or the direction opposite to the II direction) in FIG. 7A to 7C illustrate an example of a schematic configuration of a bonding apparatus 200 that bonds a double-sided tape that is a sheet member 2 to each power storage cell 1 of the power storage module 10. In addition, the bonding apparatus 200 is a part of the manufacturing apparatus of the electrical storage module 10.

  The laminating apparatus 200 is configured such that the sheet member 2 is peeled off by the winding unit 110 from the member roll 100 in which the sheet member 2 that is a double-sided tape is wound in a roll shape with one surface covered with the cover film. Are bonded to the front surface of the storage cell 1 by the guide rolls 120a and 120b. The sheet member 2 bonded to the storage cell 1 is folded back at the bracket 12a side and the bracket 12b side ends of the storage cell 1 in a state of being connected in a direction substantially perpendicular to the electrode tab 3a and the electrode tab 3b. For this reason, the sheet member 2 may always be given a constant tension by the roll 130 so that the sheet member 2 is efficiently bonded to the electricity storage cell 1.

  First, as shown in FIG. 7A, the bonding apparatus 200 bonds the sheet member 2 to the first storage cell 1 by the movement of the guide roll 120a in the arrow direction in FIG. 7A. Next, as shown in FIG. 7B, the bonding apparatus 200 retracts the guide roll 120a in the arrow direction in FIG. 7B. At this time, the bonding apparatus 200 stacks the second power storage cell 1 on the first power storage cell 1.

  And, as shown in FIG. 7C, the bonding apparatus 200 folds the sheet member 2 at the end of the second storage cell 1 by moving the guide roll 120b in the arrow direction in FIG. It bonds with respect to the 2nd electrical storage cell 1. FIG. The bonding apparatus 200 repeats the same procedure for the second and subsequent power storage cells 1. And the bonding apparatus 200 will cut | disconnect the sheet member 2 in the edge side vicinity of the last electrical storage cell 1, if the sheet member 2 is bonded with respect to the last electrical storage cell 1. FIG.

(Storage module stacking procedure)
FIG. 8 is a flowchart illustrating a stacking procedure of the power storage modules according to the first embodiment. As shown in FIG. 8, first, the bonding apparatus 200 places one electrical storage cell 1 at a predetermined position (step S11). Next, the bonding apparatus 200 bonds the sheet member 2 to the upper surface of the electricity storage cell 1 placed in step S11 (step S12). Next, the bonding apparatus 200 stacks one power storage cell 1 on the uppermost power storage cell to which the sheet member 2 is bonded (step S13).

  Next, the bonding apparatus 200 determines whether or not the power storage cell 1 stacked in step S13 is the last power storage cell 1, that is, whether or not it is the last power storage cell 1 stacked in the power storage module 10 to be assembled ( Step S14). Bonding apparatus 200 moves the process to step S16 if the determination in step S14 is Yes, and moves the process to step S15 if No.

  In step S15, the bonding apparatus 200 bends and bonds the sheet member 2 so as to extend from one end to the other end of the upper surface of the electricity storage cell 1 laminated in step S13. The bonding apparatus 200 moves the process to step S13 when step S15 ends. On the other hand, in step S <b> 16, the bonding apparatus 200 cuts the sheet member 2 bonded in step S <b> 15 at or near the other end of the storage cell 1. When step S <b> 16 ends, the bonding apparatus 200 ends the stacking of the power storage modules.

(Effect by Embodiment 1)
According to the above Embodiment 1, the electrical storage module 10 can be continuously assembled using the sheet-like sheet member 2, and the productivity of the electrical storage module 10 is improved. In addition, since the sheet member 2 is not sheet-fed but is folded between sheet-like members and disposed between the plurality of power storage cells 1, the process is simplified compared to the case of using the sheet-fed and the power storage module 10 The production cost can be reduced. That is, the power storage module 10 of Embodiment 1 can improve low cost and high productivity, and can improve the convenience of the power storage module 10 in various devices using the power storage module 10.

[Embodiment 2]
(Arrangement Mode of Sheet Member of Embodiment 2)
FIG. 9 is a diagram illustrating an appearance of the power storage module according to the second embodiment when the sheet member is arranged as viewed from the I direction. FIG. 10 is a diagram illustrating an appearance of the power storage module according to the second embodiment when the sheet member is arranged as viewed from the II direction. In Embodiment 2, compared to Embodiment 1, in the storage cell 1a, the electrode tab 3 (electrode tab 3c, electrode tab 3d) is a pair of opposite sides of a container (not shown) of the storage cell 1a. The difference is that they are arranged outward from the same side. The second embodiment is the same as the first embodiment in other points.

  As shown in FIGS. 9 and 10, for example, in the power storage module 10a, the electrode tabs 3c of the lowermost power storage cell 1a and the second power storage cell 1a from the lowermost layer are connected by the terminal connection portion 4. . One of the electrode tab 3c of the lowermost storage cell 1a and the electrode tab 3c of the second storage cell 1a from the lowermost layer is a positive electrode, and the other is a negative electrode. Further, for example, in the power storage module 10 a, the electrode tabs 3 d of the second power storage cell 1 a from the bottom layer and the third power storage cell 1 a from the bottom layer are connected by the terminal connection portion 4. Of the electrode tab 3d of the second storage cell 1a from the bottom layer and the electrode tab 3d of the third storage cell 1a from the bottom layer, one is the positive electrode and the other is the negative electrode.

  That is, in the storage cell 1a, the electrode tab 3c and the electrode tab 3d arranged in the vertical direction of FIGS. 9 and 10 are a positive electrode and a negative electrode (or a negative electrode and a positive electrode), respectively, and are stacked in the thickness direction of the storage cell 1a. Each power storage cell 1a is electrically connected in series.

(Effect of Embodiment 2)
Even in the power storage cell 1a having the electrode tab 3c and the electrode tab 3d as in the second embodiment, a sheet-like sheet member such as a double-sided tape is provided between the power storage cells 1a as in the power storage module 10 of the first embodiment. The battery cell 1a can be stacked by interposing 2 in a continuous state instead of a single wafer in a twisted state.

[Embodiment 3]
(Arrangement Mode of Sheet Member of Embodiment 3)
FIG. 11 is a diagram illustrating an external appearance of the power storage module according to the third embodiment, in which the sheet member is arranged as viewed from the I direction. FIG. 12 is a diagram illustrating an external appearance of the power storage module according to the third embodiment when the sheet member is arranged as viewed from the II direction. The third embodiment is different from the first embodiment in that a heat radiating plate 6 is disposed between the storage cells 1 in the storage module 10b. In the third embodiment, in the power storage module 10b, the sheet member 2 is interposed between the power storage cell 1 and the heat dissipation plate 6 in a continuous state, not in a single sheet, in a folded state. Are stacked. The third embodiment is the same as the first embodiment in other points.

  As shown in FIG. 11, the sheet member 2 that is disposed between each storage cell 1 and the heat dissipation plate 6 and is folded in a connected state includes the side on the bracket 12 a (see FIG. 4) side of the storage cell 1 and It is bent along the side on the bracket 12b (see FIG. 4) side. For this reason, as shown in FIGS. 11 and 12, the bent portion of the sheet member 2 is located on the end of the heat sink 6 on the bracket 12a (see FIG. 4) side when viewed from the I direction. As shown in FIG. 12, when viewed from the direction opposite to the I direction, the bent portion of the sheet member 2 is located on the end of the battery cell 1 on the bracket 12 b (see FIG. 4) side.

In Embodiment 3, since the sheet member 2 conducts the heat of the storage cell 1 to the heat radiating plate 6 through the sheet member 2, the sheet member 2 may have higher thermal conductivity. By using the sheet member 2 having a thermal resistance value of, for example, 10 cm ² · K / W or less, the heat generated by the storage cell 1 can be efficiently conducted to the heat radiating plate 6. Further, the sheet member 2 preferably has a thermal resistance value of, for example, 5 cm ² · K / W or less, 1 cm ² · K / W or less.

  And the heat sink 6 discharge | releases the heat | fever emitted from the electrical storage cell 1 efficiently by the input / output of electric power outside. The heat sink 6 may be a metal, alloy, or carbon fiber material mainly composed of aluminum, copper, iron, magnesium, titanium, or the like.

(Relationship of size of each part of power storage module of embodiment 3)
FIG. 13 is an explanatory diagram showing the relationship of the size of each part in the power storage module of the third embodiment. FIG. 13 is an enlarged view of a part of FIG. The width B of the sheet member 2 shown in FIG. 13 is desirably equal to or greater than the width A of the current collector of the storage cell 1. The current collector is a portion in which main components of the storage cell 1 such as a positive electrode material, a separator, and an electrolytic solution are included, except for a portion that seals the laminate film. As shown in FIG. 13, the length in the direction in which the electrode tab 3a and the electrode tab 3b are arranged is the width of the current collector.

  That is, by setting (the width A of the current collector of the electricity storage cell 1) ≦ (the width B of the sheet member 2), the electricity storage cell 1 and the heat sink 6 are bonded together with a necessary and sufficient contact area. If (the width A of the current collector of the electricity storage cell 1)> (the width B of the sheet member 2), the area of the sheet member 2 is smaller than the area of the current collector, so the electricity storage cell 1 and the heat sink 6 Cannot be bonded with the required contact area. Further, if (the width A of the current collector of the electricity storage cell 1)> (the width B of the sheet member 2), the heat dissipation capability of the heat sink 6 cannot be exhibited sufficiently. Moreover, the insulation capability of the sheet | seat member 2 cannot fully be exhibited as it is (width A of the electrical power collector of the electrical storage cell 1)> (width | variety B of the sheet | seat member 2).

  In addition, the power storage module 10 b is configured by fastening and holding the stacked power storage cells 1 by the exterior portion 20, but a fastening pressure is applied in the stacking direction of the power storage cells 1 during fastening and holding. At this time, when (the width A of the current collector of the storage cell 1)> (the width B of the sheet member 2), the fastening pressure of the portion where the sheet member 2 is disposed is relatively large, but the sheet member 2 is The fastening pressure of the portion that is not arranged is relatively small or zero. That is, the fastening pressure distribution is uneven. The uneven fastening pressure may affect the deterioration life of the storage cell 1. For the above reason, (the width A of the current collector of the storage cell 1) ≦ (the width B of the sheet member 2) is desirable.

  The maximum value of (the width B of the sheet member 2) may be, for example, about 1.2 times the width C of the heat sink 6 shown in FIG. It is. The same applies to the first embodiment in that (the width A of the current collector of the storage cell 1) ≦ (the width B of the sheet member 2) is desirable.

(Effect by Embodiment 3)
According to the third embodiment, due to the thermal conductivity of the sheet member 2 and the heat dissipation property of the heat radiating plate 6, the heat generated by the storage cell 1 is efficiently conducted to the heat radiating plate 6, and It can discharge | release to the exterior of the electrical storage module 10b efficiently through an opening part.

  The power storage modules 10, 10 a, and 10 b according to the above first to third embodiments and their respective parts are merely examples. That is, a power storage module configured by appropriately combining and substituting each part of the power storage modules 10, 10a, and 10b according to the first to third embodiments is also included in the power storage module according to the disclosed technology.

1, 1a, 1b Power storage cell 2 Sheet member 3, 3a, 3b, 3c, 3d Electrode tab 4a, 4b Terminal connection part 5 Container 5a, 5b Cell surface 6 Heat sink 10, 10a, 10b Power storage module 11a, 11b End plate 12a 12b Bracket 13 Screw 20 Exterior part 100 Member roll 110 Winding part 120a, 120b Guide roll 130 Roll 200 Bonding device

Claims (6)

A plurality of substantially flat storage batteries stacked;
Folded along one of the opposite end portions of each of the storage batteries between the adjacent stacks of the plurality of storage batteries and continuously arranged between the stacks of the plurality of storage batteries, each stack state of the plurality of storage batteries And a sheet member to be held. A plurality of substantially flat storage batteries;
A plurality of heat sinks alternately stacked with the plurality of storage batteries;
Between each of the adjacent stacks of the plurality of storage batteries and the plurality of heat sinks, folded back along one of the opposite ends of each of the storage batteries or each of the heat sinks, and the plurality of storage batteries and the plurality of heat sinks A power storage module comprising: a plurality of storage batteries, and a sheet member that holds each of the stacked states of the plurality of heat sinks.   3. The power storage module according to claim 1, wherein the sheet member is continuous in a substantially perpendicular direction with respect to an arrangement direction of the electrodes of the plurality of storage batteries.   The power storage module according to claim 1, wherein the sheet member has electrical insulation.   The said sheet | seat member is a double-sided adhesive tape which has adhesiveness on both surfaces, The electrical storage module as described in any one of Claims 1-4 characterized by the above-mentioned.   The power storage module according to claim 1, wherein a width of the sheet member is equal to or greater than a width of a current collector portion of the storage battery.

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