JP6832383B2 - Power storage element module, power storage element unit, building and housing - Google Patents

Description

The present invention relates to a power storage element module having a plurality of cells, a power storage element unit having a plurality of power storage element modules, a building including the power storage element unit, and an accommodating body for the power storage element module.

For example, as disclosed in Patent Document 1, a power storage element unit having a plurality of power storage element modules is known. Each power storage element module includes a plurality of stacked cells. In each power storage element module, two cells adjacent to each other in the stacking direction are electrically connected or insulated. When two adjacent cells are arranged close to each other, a problem may occur such as an unintended short circuit of tabs, for example, a tab of one cell comes into contact with an exterior material of another cell. In order to avoid such a problem, it is effective to arrange the two cells apart from each other. However, if the two cells are arranged apart from each other, the power storage element module becomes large and the energy efficiency of the power storage element module decreases.

JP-A-2017-5027

The present invention has been made in consideration of the above points, and an object of the present invention is to reduce the size of the power storage element module.

The power storage element module according to the present invention
A plurality of cells stacked in the stacking direction, wherein each cell has a tab on the peripheral edge portion and the thickness of the peripheral edge portion is thinner than the thickness of the central portion surrounded by the peripheral edge portion. When,
An electrode member arranged between the tabs of two cells adjacent to each other in the stacking direction and electrically connected to each other, and electrically connected to the two electrically connected cells.
The electrode member is provided at a position deviated from the central portion in a direction orthogonal to the stacking direction.

The power storage element module according to the present invention
Further provided with a case for accommodating the plurality of cells
The case holds the electrode member so as to allow the electrode member to move relative to the case in the stacking direction and to regulate the relative movement of the electrode member to the case in a direction orthogonal to the stacking direction. You may try to do so.

The power storage element module according to the present invention
Further provided with a case for accommodating the plurality of cells
The case has a bottom portion that supports the plurality of cells from one side in the stacking direction, and a side wall portion that rises from the bottom portion in the stacking direction.
The side wall is provided with a notch through which the tabs of the plurality of cells pass.
The electrode member may be supported by the side wall portion.

The power storage element module according to the present invention
Further provided with a case for accommodating the plurality of cells
The case has a bottom portion that supports the plurality of cells from one side in the stacking direction, and a side wall portion that rises from the bottom portion in the stacking direction.
One of the electrode member and the side wall portion has a recess extending in the stacking direction.
The other of the electrode member and the side wall portion may have a convex portion that is inserted into the concave portion and is movable relative to the concave portion in the stacking direction.

In the power storage element module according to the present invention
The cell has an electrode body including a plurality of electrode plates, an exterior body containing the electrode body, and a tab connected to the electrode body and extending to the outside of the exterior body.
The tab has a base end portion extending from the exterior body and a tip end portion bent with respect to the base end portion.
The tips of the tabs of the two electrically connected cells may be in surface contact with each other on the electrode member.

In the power storage element module according to the present invention, the base end portion may extend in a direction orthogonal to the stacking direction, and the tip end portion may extend in the stacking direction.

In the power storage element module according to the present invention, the tip of the tab located on one side of the two electrically connected cells in the stacking direction is the other in the stacking direction from the base end of the tab. The tip of the tab extending to the side and located on the other side of the two electrically connected cells in the stacking direction is from the base end of the tab to one side in the stacking direction. It may extend.

In the power storage element module according to the present invention
The cell has an electrode body including a plurality of electrode plates, an exterior body containing the electrode body, and a tab connected to the electrode body and extending to the outside of the exterior body.
The exterior body includes a first exterior material having a bulging portion forming the central portion, a flat second exterior material forming a space for accommodating the electrode body between the first exterior material, and a flat second exterior material. Have,
The plurality of cells include a cell in which the first exterior material faces one side in the stacking direction and the second exterior material faces the other side in the stacking direction, and the second exterior material faces one side in the stacking direction. Direction The first exterior material may be laminated so that cells facing the other side in the stacking direction are alternately arranged in the stacking direction.

In the power storage element module according to the present invention, the two electrically connected cells in which the electrode members are arranged may be laminated so that the first exterior materials face each other.

In the power storage element module according to the present invention, the thickness of the electrode member along the stacking direction is larger than the protrusion length along the front stacking direction of the bulging portion, and the protruding length along the front stacking direction of the bulging portion. It may be less than twice that.

The power storage element unit according to the present invention includes any of the above-mentioned power storage element modules according to the present invention.

The building according to the present invention includes any of the above-mentioned power storage element units according to the present invention.

The housing for the power storage element module according to the present invention is
A case that accommodates a plurality of cells stacked in the stacking direction, and has a bottom portion that supports the plurality of cells from one side in the stacking direction, and a side wall portion that rises from the bottom portion in the stacking direction. When,
The two electrically connected cells and the electrode member electrically connected to each other are provided between the tabs of two cells adjacent to each other in the stacking direction and electrically connected to each other.
Each cell has the tab on the peripheral edge, and the thickness of the peripheral edge is thinner than the thickness of the central portion surrounded by the peripheral edge.
The electrode member is provided at a position deviated from the central portion in a direction orthogonal to the stacking direction.

According to the present invention, the energy storage element module can be miniaturized to improve energy efficiency.

FIG. 1 is a diagram for explaining one embodiment, and is a perspective view showing a power storage element unit. FIG. 2 is a perspective view showing the inside of the power storage element unit of FIG. FIG. 3 is a perspective view showing a power storage element module combination and a power storage element module arranged in the storage box of the power storage element unit of FIG. FIG. 4 is a side view showing the power storage element module combination of FIG. 3, and shows the power storage element module combination from the second direction. FIG. 5 is a front view showing a schematic configuration of the power storage element module combination of FIG. 3, and shows the power storage element module combination from the third direction. FIG. 6 is a perspective view showing a power storage element module included in the power storage element module combination of FIG. 7 is a perspective view showing the power storage element module of FIG. 6, and is shown from the opposite side in the first direction of the power storage element module. FIG. 8 is a perspective view showing a plurality of stacked cells included in the power storage element module of FIG. FIG. 9 is a perspective view showing one cell shown in FIG. FIG. 10 is a diagram for explaining electrical connections for the plurality of cells of FIG. FIG. 11 is a perspective view showing the power storage element module of FIG. 6, showing a state in which the cover is removed from the case. FIG. 12 is a configuration diagram schematically showing a main configuration of the power storage element module of FIG. FIG. 13 is a partial perspective view showing the inside of the power storage element module of FIG. 6 in an enlarged manner. FIG. 14 is a perspective view showing a case included in the power storage element module of FIG. FIG. 15 is a partially enlarged view of FIG. FIG. 16 is a vertical cross-sectional view showing the power storage element module of FIG. FIG. 17 is a vertical cross-sectional view showing the power storage element module of FIG. 6, and shows the power storage element module at a position different from that of FIG. 16 along the third direction. FIG. 18 is a perspective view showing a tab block included in the power storage element module of FIG. FIG. 19 is a perspective view showing an electrode member included in the power storage element module of FIG. FIG. 20 is a perspective view showing a part of the configuration of the power storage element module of FIG. 6, and is a diagram for explaining a support structure of a tab block and an electrode member by a case. FIG. 21 is a perspective view showing a partial configuration of the power storage element module of FIG. 6, and is a diagram for explaining a cell positioning structure by a case and a tab block. FIG. 22 is a diagram corresponding to FIG. 12 and is a diagram for explaining a modification of the cell.

Hereinafter, an embodiment of the present invention will be described with reference to the specific examples shown in the drawings. In the drawings attached to the present specification, the scale, aspect ratio, etc. are appropriately changed from those of the actual product and exaggerated for the convenience of illustration and comprehension.

1 to 21 are views for explaining an embodiment according to the present invention and a modification thereof. Of these, FIG. 1 is a perspective view showing the power storage element unit 10, FIG. 2 is a perspective view showing the inside of the power storage element unit, and FIG. 3 shows a power storage element module 20 included in the power storage element unit. ing. The power storage element unit 10 is used as a secondary battery unit capable of charging and discharging. The illustrated power storage element unit 10 is applied to a building such as a house or a public facility, and functions as a power source for an electric device installed in the building by being electrically connected to the wiring of the building.

As shown in FIGS. 1 and 2, the power storage element unit 10 includes a storage box 11, a control module 14 housed in the storage box 11, and a plurality of power storage element modules 20. The storage box 11 has a frame 12 and a panel 13 fixed to the frame 12. The frame 12 is made of, for example, metal or resin, and has a certain degree of strength. The frame 12 forms an arrangement space for the control module 14 and the power storage element module 20. The panel 13 is, for example, a resin or metal plate-shaped member. The panel 13 closes the arrangement space of the control module 14 and the power storage element module 20.

The control module 14 has, for example, a function of controlling charging and discharging of a plurality of power storage element modules 20, a function of monitoring the charging state (for example, the amount of charge) of the power storage element module 20, and monitoring the presence or absence of an abnormality in the power storage element module 20. Has one or more functions. Further, the control module 14 may transmit information such as a charging state of the power storage element module 20 and a monitoring result of the presence or absence of an abnormality to a control device installed outside the power storage element unit 10. Further, the control module 14 may have a switch for switching the electrical connection and disconnection between the external wiring of the power storage element unit 10 (for example, the wiring of a building) and the power storage element module 20.

FIG. 2 shows the power storage element unit 10 with the upper surface and the front panel removed. Further, FIG. 3 shows a plurality of power storage element modules 20 in a state of being housed in the storage box 11. As shown in FIG. 3, the power storage element unit 10 has two power storage element module unions 15. The power storage element module combination 15 has a plurality of power storage element modules 20 stacked in the first direction DA. The two power storage element module combinations 15 are arranged side by side in the second direction DB which is non-parallel to the first direction DA.

In the illustrated example, the first power storage element module combination 15A has three power storage element modules 20 stacked in the first direction DA. The second power storage element module combination 15B is adjacent to the first power storage element module combination 15A from one side SB1 in the second direction DB. As shown in FIG. 2, the second power storage element module combination 15B supports the control module 14 from one side SA1 in the first direction DA. FIG. 4 shows the first power storage element module combination 15A from the other side in the second direction DB. FIG. 5 schematically shows a first power storage element module combination 15A from one side SC1 in a third direction DC that is non-parallel to both the first direction DA and the second direction DB. 6 and 7 show one power storage element module 20 included in the power storage element module combination 15. The plurality of power storage element modules 20 included in the power storage element unit 10 may have different configurations from each other, or may have the same configuration as each other. However, from the viewpoint of improving versatility, the plurality of power storage element modules 20 preferably have the same configuration as each other, and at least the same parts as each other (for example, cell 30, case 40, cover 60, tab block 70 described later). , The electrode member 80) is preferably included. In the illustrated example, the plurality of power storage element modules 20 have the same configuration as each other.

In order to clarify the directional relationship between the drawings, in some drawings, the first direction DA, the second direction DB, and the third direction DC are indicated by arrows as common directions between the drawings. The tip side of the arrow is one side SA1, SB2, SC3 of each direction DA, DB, DC. Further, an arrow directed toward the back of the paper along the direction perpendicular to the paper of the drawing is indicated by a symbol in which an X is provided in a circle, for example, as shown in FIG. Arrows from the paper surface to the front along the direction perpendicular to the paper surface of the drawing are indicated by symbols having dots in the circle, for example, as shown in FIG. Further, in the figure showing the parts (for example, the power storage element module combination 15 and the power storage element module 20) housed in the storage box 11, the direction and the direction in the state of being housed in the storage box 11 are shown. Similarly, in the figure showing each component (for example, cell 30, case 40, cover 60, tab block 70, electrode member 80, which will be described later) included in the power storage element module 20, the power storage element module housed in the storage box 11 The direction and direction in the state of being incorporated in 20 are shown.

In the illustrated example, the first direction DA, the second direction DB and the third direction DC are in a vertical relationship with each other. Further, the first direction DA is parallel to the vertical direction. One side SA1 in the first direction DA is the lower side in the vertical direction, and the other side opposite to one side in the first direction DA is the upper side in the vertical direction.

The power storage element module 20 includes a large number of cells 30 and an accommodating body 18 accommodating the cells 30. The cell 30 is the smallest unit treated as a power storage element. Various types of cells can be adopted for the cell 30, and for example, a lithium ion secondary battery can be used. FIG. 8 shows a plurality of cells 30 included in one power storage element module 20, and FIG. 9 shows one cell 30. The plurality of cells 30 included in one power storage element module 20 may have the same configuration as each other, or may have different configurations from each other.

As shown in FIGS. 8 and 9, the cell 30 has a flat shape. The cell 30 has a substantially rectangular shape in a plan view (when observed from the first direction DA). The cell 30 has a lateral direction in the second direction DB and a longitudinal direction in the third direction DC. The plurality of cells 30 are laminated in the stacking direction. In the illustrated example, the stacking direction of the cells 30 is parallel to the first direction DA. The cell 30 has a central portion 31C located at the center and a peripheral portion 31E surrounding the central portion 31C. The thickness of the central portion 31C is thicker than that of the peripheral portion 31E. In the illustrated example, the cell 30 bulges toward either side in the first direction DA at the central portion 31C. The plurality of cells 30 are stacked so that the central portion 31C at least partially faces each other in the first direction DA. The cell 30 shown in FIG. 9 has a plurality of electrode plates 32 including a positive electrode plate and a negative electrode plate, an exterior body 33 accommodating the plurality of electrode plates 32, and an exterior body 33 electrically connected to the electrode plates 32. It has a tab 35 extending to the outside of the. The cell 30 has a pair of tabs 35. The pair of tabs 35 function as positive electrode terminals or negative electrode terminals, respectively. The illustrated tab 35 has a base end portion 35A extending from the exterior body 33 and a tip end portion 35B bent with respect to the base end portion 35A.

The cell 30 has a substantially symmetrical configuration with respect to a plane along the first direction DA and the third direction DC passing through the center in the second direction DB as a reference plane. Further, the cell 30 has a substantially symmetrical configuration with respect to a surface along the first direction DA and the second direction DB passing through the center in the third direction DC as a reference surface.

A large number of cells 30 included in one power storage element module 20 are electrically connected to each other by series connection or parallel connection. By appropriately setting the quantity and connection of the cells 30 in series and in parallel, the output from one cell 30 can have a desired voltage and a desired capacitance. In the illustrated example, one cell 30 includes 16 cells 30. In particular, in the example shown in FIG. 10, two sets of two cells 30 connected in parallel are connected in series.

In the example shown in FIG. 10, the exterior body 33 has a first exterior material 34A and a second exterior material 34B. The first exterior material 34A and the second exterior material 34B are connected to each other at the peripheral edge portion, for example, are heat-welded. The first exterior material 34A has a bulging portion 34AP. The first exterior material 34A and the second exterior material 34B form a space for accommodating the electrode plate 32 inside the bulging portion 34AP of the first exterior material 34A. Further, the bulging portion 34AP defines the central portion 31C of the cell 30. On the other hand, the second exterior material 34B is formed in a flat plate shape. The tab 35 passes between the first exterior material 34A and the second exterior material 34B and extends to the outside of the exterior body 33. The exterior body 33 has a substantially rectangular shape in a plan view (when observed from the first direction DA). The exterior body 33 has a lateral direction in the second direction DB and a longitudinal direction in the third direction DC.

The first exterior material 34A is embossed, for example, to form a bulging portion 34AP. Generally, the first exterior material 34A and the second exterior material 34B have a metal layer and an inner layer laminated inside the metal layer. The inner layer is a layer having an insulating property, preferably having a thermoplastic property. By heating and pressurizing the first exterior material 34A and the second exterior material 34B laminated so that the inner layers having thermoplasticity face each other, the first exterior material 34A and the second exterior material 34B are brought into the peripheral portion. It can be heat welded at 31E. Further, since the first exterior material 34A and the second exterior material 34B include a metal layer, rigidity can be imparted to the exterior body 33. On the other hand, when the tab 35 of the other cell 30 comes into contact with the exterior body 33 including the metal layer, an unintended short circuit or the like may occur. However, in the present embodiment, a device is made to prevent such a short circuit from occurring. Specifically, a tab block 70 and an electrode member 80, which will be described later, are provided.

In the example shown in FIG. 10, the first exterior material 34A faces one side SA1 in the first direction (stacking direction) DA, and the second exterior material 34B faces the other side in the first direction (stacking direction) DA. , The cells in which the second exterior material 34B faces one side SA1 in the first direction DA and the first exterior material 34A faces the other side in the first direction DA are alternately arranged in the first direction (stacking direction) DA. .. The illustrated power storage element module 20 includes first cell 30A to 16th cell 30P arranged in order from the other side in the first direction DA.

In the two cells 30 adjacent to the first direction DA and the second exterior material 34B facing the first direction DA, the tabs 35 forming the positive electrode terminals face each other and the tabs 35 forming the negative electrode terminals face each other. Are arranged so as to face the first direction DA. Specifically, the first cell 30A and the second cell 30B are laminated so that the second exterior material 34B and the tab 35 face each other. Similarly, the third cell 30C and the fourth cell 30D are laminated so that the second exterior material 34B and the tab 35 face each other. The fifth cell 30E and the sixth cell 30F are laminated so that the second exterior material 34B and the tab 35 face each other. The 7th cell 30G and the 8th cell 30H are laminated so that the second exterior material 34B and the tab 35 face each other. The ninth cell 30I and the tenth cell 30J are laminated so that the second exterior material 34B and the tab 35 face each other. The 11th cell 30K and the 12th cell 30L are laminated so that the second exterior material 34B and the tab 35 face each other. The 13th cell 30M and the 14th cell 30N are laminated so that the second exterior material 34B and the tab 35 face each other. The 15th cell 30O and the 16th cell 30P are laminated so that the second exterior material 34B and the tab 35 face each other. Then, in the two cells 30 adjacent to these first-direction DAs and the second exterior material 34B facing the first-direction DA, the tabs 35 forming the positive electrode terminals are electrically connected to each other to form the negative electrode terminals. The 35s are electrically connected to each other.

Further, the tabs 35 forming the negative electrode terminals of the first and second cells 30A and 30B are electrically connected to the tabs 35 forming the positive electrode terminals of the third and fourth cells 30C and 30D. The tabs 35 forming the negative electrode terminals of the third and fourth cells 30C and 30D are electrically connected to the tabs 35 forming the positive electrode terminals of the fifth and sixth cells 30E and 30F. The tabs 35 forming the negative electrode terminals of the fifth and sixth cells 30E and 30F are electrically connected to the tabs 35 forming the positive electrode terminals of the seventh and eighth cells 30G and 30H. The tabs 35 forming the negative electrode terminals of the seventh and eighth cells 30G and 30H are electrically connected to the tabs 35 forming the positive electrode terminals of the ninth and tenth cells 30I and 30J. The tabs 35 forming the negative electrode terminals of the ninth and tenth cells 30I and 30J are electrically connected to the tabs 35 forming the positive electrode terminals of the eleventh and twelfth cells 30K and 30L. The tabs 35 forming the negative electrode terminals of the 11th and 12th cells 30K and 30L are electrically connected to the tabs 35 forming the positive electrode terminals of the 13th and 14th cells 30M and 30N. The tabs 35 forming the negative electrode terminals of the 13th and 14th cells 30M and 30N are electrically connected to the tabs 35 forming the positive electrode terminals of the 15th and 16th cells 30O and 30P.

In such a plurality of cells 30, two tabs 35 are laminated in the first direction DA so that the second exterior material 34B faces each other by including the base end portion 35A and the tip end portion 35B bent from each other. The deviation of the relative position of the cell 30 can be effectively suppressed. This makes it possible to effectively improve the seismic resistance of the power storage element module 20.

The specific configuration of the power storage element module 20 will be described in more detail.

As shown in FIGS. 11 to 13, the power storage element module 20 has a case 40 and a cover 60 as an accommodating body 18 for accommodating a plurality of cells. The cover 60 is removable to the case 40. Further, the power storage element module 20 has a tab block 70 and an electrode member 80 held in the case 40, and a first end cover 21 and a second end cover 22 fixed to the case 40. In the illustrated example, the accommodating body 18 of the power storage element module 20 accommodating a plurality of cells 30 has, as main components, a first end cover 21, a second end cover 22, a case 40, and a cover 60. It includes a tab block 70 and an electrode member 80.

Here, FIG. 11 is a perspective view showing the power storage element module 20 with the cover 60 removed from the case 40, and FIG. 12 is a side view schematically showing the main configuration of the power storage element module 20. Further, FIG. 13 is a perspective view showing a portion covered by the first end cover 21 and the cover 60 of the power storage element module 20 with the first end cover 21 and the cover 60 removed. 14 is a perspective view showing the case 40, and FIG. 15 is an enlarged perspective view showing the case 40.

The case 40 accommodating the plurality of cells 30 has a bottom portion 42 supporting the plurality of cells 30 from one side SA1 in the first direction DA and a side wall portion 44 rising from the bottom portion 42 in the first direction DA as an overall configuration. And have. The case 40 is open to the other side in the first direction DA. That is, the case 40 has an opening 40a at a position facing the bottom portion 42. The side wall portion 44 surrounds the cell 30 from the second direction DB and the third direction DC. More precisely, the side wall portion 44 surrounds the exterior body 33 of the cell 30 from the second direction DB and the third direction DC. The side wall portion 44 extends along the outer edge of the exterior body 33 of the cell 30 as observed from the first direction DA. A notch C is provided in the side wall portion 44. The notch C is provided in the notch forming wall portion 45 extending along the second direction DB in the side wall portion 44. Then, the tab 35 extends into the notch C. The notch C and the side wall portion 44 related to the notch C will be described later together with the tab block 70 and the electrode member 80.

The side wall portion 44 faces the cell 30 from a direction orthogonal to the first direction DA, for example, a second direction DB or a third direction DC. The side wall portion 44 regulates the relative movement of the cell 30 with respect to the case 40 in a direction orthogonal to the first direction DA, for example, along the second direction DB or the third direction DC. As a result, the plurality of cells 30 can be stably held in the case 40. On the other hand, the case 40 has an opening 40a in the first direction DA, and allows the cell 30 to move relative to the case 40 in the first direction DA.

The cover 60 is held by the case 40 so as to be movable in the first direction DA, and covers the opening 40a of the case 40. The cover 60 covers the cell 30 housed in the case 40 from the other side in the first direction DA. The cover 60 protects the cell 30 and also regulates the free relative movement of the cell 30 to the other side in the first direction DA with respect to the case 40.

As shown in FIG. 11, the cover 60 has a cover main body 61 and a fixing portion 62 extending from the cover main body 61. The fixing portion 62 can be engaged with the receiving portion 49 provided on the side wall portion 44 of the case 40. The cover 60 is held by the case 40 by engaging the fixing portion 62 with the receiving portion 49. In the illustrated example, the fixing portion 62 engages with the receiving portion 49 so as to be movable in the first direction DA.

As shown in FIG. 11, the cover 60 has a fixing portion 62 at each position separated from the second direction DB. Further, the cover 60 has fixed portions 62 at positions separated from each other in the third direction DC. The plurality of fixing portions 62 are provided at positions facing the side wall portion 44 along the first direction DA. In the illustrated example, four fixing portions 62 are provided apart from each other in each portion of the side wall portion 44 extending in the third direction DC. Therefore, in the illustrated example, eight fixing portions 62 are provided on one cover 60.

As shown in FIG. 11 and FIG. 16 which is a cross-sectional view taken along the first direction DA and the second direction DB, the fixing portion 62 includes an extending portion 62a extending from the cover main body 61 in the first direction DA. It has a claw portion (insertion portion) 62b protruding from the extending portion 62a to the second direction DB. The fixing portion 62 is integrally molded with the cover main body 61 as, for example, a resin molded product, and is elastically deformable. In particular, the illustrated extension portion 62a is formed as a plate-like portion having a long side along the first direction DA and a short side along the third direction DC, and has an axis along the third direction DC. It is easy to bend and deform (bend deformation) as the center.

On the other hand, the receiving portion 49 is a hole 49a provided in the side wall portion 44. The hole 49a forming the receiving portion 49 has a width slightly wider than the width of the claw portion (insertion portion) 62b along the third direction DC (see FIG. 11). Further, as shown in FIG. 16, the hole 49a forming the receiving portion 49 has a certain length along the first direction DA. The holes 49a forming the receiving portion 49 are provided corresponding to the respective fixing portions 62. That is, four receiving portions 49 are provided at each portion of the side wall portion 44 extending in the third direction DC so as to be separated from the third direction DC. Therefore, the side wall portion 44 is provided with a total of eight receiving portions 49.

The illustrated side wall portion 44 has a double wall structure in the region on the other side in the first direction DA. As can be confirmed in FIGS. 13 and 16, the side wall portion 44 has a main wall portion 44a extending from the bottom portion 42 along the first direction DA and a cell 30 in the outer side in the second direction DB, that is, in the second direction DB. The outer wall portion 44b extending from the main wall portion 44a is included on the side separated from the space for accommodating the above. The outer wall portion 44b is provided only in the region on the other side in the first direction DA. As shown in FIG. 16, the space between the main wall portion 44a and the outer wall portion 44b is open to the other side in the first direction DA. The hole 49a forming the receiving portion 49 is provided in the outer wall portion 44b of the side wall portion 44.

The height of the main wall portion 44a is lower than the height of the outer wall portion 44b. In other words, the position of the main wall portion 44a on the other side in the first direction DA is located on the other side in the first direction DA than the position of the outer wall portion 44b on the other side in the first direction DA. There is. The height of the main wall portion 44a is lower than the height of the outer wall portion 44b by a length longer than the thickness of the cover main body 61. According to such a configuration, as will be described later, it is possible to prevent the cover body 61 of the cover 60 from coming into contact with the power storage element module 20 located next to it.

By bending and bending the extending portion 62a of the fixing portion 62, the claw portion (inserting portion) 62b can be inserted into the receiving portion 49. As a result, the cover 60 is held by the case 40. Then, as shown by the dotted line in FIG. 16, the claw portion (insertion portion) 62b moves in the first direction DA in the hole 49a, so that the cover 60 held by the case 40 becomes the first with respect to the case 40. You can move in the direction DA.

The cover 60 can be removed from the case 40 by bending the extending portion 62a by pushing the claw portion 62b from the hole 49a or the like. The main wall portion 44a is provided inside the main wall portion 44a provided with the hole 49a in the second direction DB, that is, on the space side in the second direction DB for accommodating the cell 30. By interposing the main wall portion 44a, it is possible to effectively prevent the fixing portion 62 from coming into contact with the cell 30 when the extending portion 62a is bent. Therefore, when the cover 60 is removed from the case 40, it is possible to effectively prevent the cell 30 from being damaged by the fixing portion 62.

By making the cover 60 attached to the case 40 movable in the first direction DA with respect to the case 40, it is possible to absorb variations in the thickness of the cell 30. That is, a plurality of cells 30 can be stacked as they are and stored in the case 40 without adjusting the interval with a spacer or the like, and the cover 60 can be attached to the case 40. Therefore, the thickness of the power storage element module 20 can be reduced while the cell 30 is stably held and protected by the case 40 and the cover 60. Further, since it is not necessary to adjust the interval with a spacer or the like, the number of parts of the power storage element module 20 can be reduced and the structure can be simplified. Therefore, it is possible to reduce the manufacturing cost of the power storage element module 20 and the power storage element unit 10 and improve the productivity.

Unlike the illustrated example, the cover 60 has a hole 49a forming a receiving portion 49, and the case 40 is inserted into the hole 49a and the claw portion (insertion portion) that can be moved in the first direction DA in the hole 49a. It may have 62b. Also in this example, the simple structure makes it possible to move the cover 60 with respect to the case 40 in the first direction DA.

The cells 30 adjacent to the first direction DA may be fixed to each other via the bonding layer 38 (see FIG. 12). According to this example, by using the bonding layer 38, a plurality of cells 30 can be stably held in the case 40. Further, by changing the thickness of the bonding layer 38 according to the thickness of the cell 30, it is possible to effectively absorb the variation in the thickness of the cell 30 without adjusting the interval with a spacer or the like. As a result, a plurality of cells 30 can be stably accommodated in a constant accommodating body 18 having versatility.

Further, in the illustrated example, the receiving portion 49 is configured as a hole 49a. Therefore, the claw portion (insertion portion) 62b can move only within the hole 49a. That is, the movement of the cover 60 held in the case 40 with respect to the case 40 in the first direction DA is restricted within a certain range. Therefore, it is possible to prevent the cover 60 from coming off from the case 40.

Further, as shown in FIG. 16, in the power storage element module combination 15 including the plurality of power storage element modules 20, the side wall portion 44 of the first power storage element module 20A is second from one side in the first direction DA. By contacting the case 40 of the power storage element module 20B, the first power storage element module 20A and the second power storage element module 20B are stacked. The cover 60 of the first power storage element module 20A is separated from the second power storage element module 20B in a state where the first power storage element module 20A and the second power storage element module 20B are stacked. That is, the second power storage element module 20B stacked on the first power storage element module 20A is supported on the side wall portion 44 of the first power storage element module 20A and is separated from the cover 60. Therefore, it is possible to effectively prevent the second power storage element module 20B from pressing the plurality of cells 30 of the first power storage element module 20A via the cover 60. As a result, damage to the cell 30 of the power storage element module 20 can be effectively avoided while arranging the plurality of power storage element modules 20 in a compact space.

In particular, in FIG. 16, the cover 60 of the first power storage element module 20A is movable with respect to the case 40 within a range maintained in a state of being separated from the second power storage element module 20B. According to such an example, it is possible to more effectively prevent the second power storage element module 20B from pressing the plurality of cells 30 of the first power storage element module 20A through the cover 60. ..

The cover 60 is formed using, for example, an insulating material. The cover 60, as a whole, can be integrally molded from an insulating resin. Similarly, the case 40 is also formed using, for example, an insulating material. The case 40 can be integrally molded from an insulating resin as a whole including a portion described later.

Next, the configuration of the case 40 for stacking the first power storage element module 20A and the second power storage element module 20B will be described in more detail.

As shown in FIG. 16, which is a cross-sectional view taken along the first direction DA and the second direction DB, in the power storage element module combination 15 including the plurality of power storage element modules 20, the side wall portion 44 of the first power storage element module 20A. However, the first power storage element module 20A and the second power storage element module 20B are stacked by contacting the case 40 of the second power storage element module 20B from one side in the first direction DA. For example, as shown in FIGS. 14 and 15, the power storage element module 20 is provided at a distance from the second direction DB, which is the lateral direction of the cell 30, and is a first protruding portion protruding to the other side in the first direction DA. It has a 51 and a second protrusion 52. Then, as shown in FIG. 17, the first power storage element module 20A comes into contact with the second power storage element module 20B via the first protrusion 51 and the second protrusion 52.

As shown in FIG. 17, the second power storage element module 20B is supported on the first protrusion 51 and the second protrusion 52 of the first power storage element module 20A. Then, as shown in FIGS. 17, 4 and 5, in the region between the first protrusion 51 and the second protrusion 52 in the second direction DB, the first power storage element module 20A and the second The power storage element modules 20B can be separated from each other in the first direction DA.

Each power storage element module 20 includes a large number of stacked cells 30. Each cell 30 heats up during charging and discharging. However, in each power storage element module 20, flat cells are laminated at a high density. Therefore, heat cannot be efficiently released from each power storage element module 20. That is, there is a possibility that a significant temperature rise may occur inside the power storage element module 20. When the cell 30 is held at a high temperature, it becomes difficult for the power storage element module 20 to function effectively. In addition, there is a possibility that the power storage element module 20 may malfunction.

On the other hand, in the present embodiment, the first power storage element module 20A and the second power storage element module 20B are placed in the first direction between the first protrusion 51 and the second protrusion 52 in the second direction DB. It is separated from DA. That is, by blowing air into the space as the gap V between the first power storage element module 20A and the second power storage element module 20B, heat is dissipated from the first power storage element module and the second power storage element module. Can be effectively promoted. Alternatively, by arranging the heat transfer member 25 or the like in the space between the first power storage element module 20A and the second power storage element module 20B as shown in FIG. 5, the first power storage element module 20A and the second power storage element module 20A and the second It is possible to effectively prevent heat from accumulating in the power storage element module 20B. That is, it is possible to effectively promote heat dissipation from the power storage element module 20 included in the power storage element module combination 15. As a result, it is possible to suppress the temperature rise of the power storage element module 20 and make the power storage element module 20 function effectively.

As the heat transfer member 25, a member made of a material having high thermal conductivity can be used. Preferably, as the material of the heat transfer member 25, a material having a higher thermal conductivity than the material forming the case 40 is used. More specifically, as the heat transfer member 25, a metal plate having a sufficient heat capacity, for example, a plate material made of aluminum or an aluminum alloy can be used.

In the illustrated example, the first power storage element module 20A is located on the lower side in the vertical direction with respect to the second power storage element module 20B, and the first protrusion 51 and the second protrusion 52 are in the vertical direction. However, it is not limited to this example. Even if the first power storage element module 20A is located above the second power storage element module 20B in the vertical direction and the first protrusion 51 and the second protrusion 52 project downward in the vertical direction. Similar effects can be expected.

The first protruding portion 51 and the second protruding portion 52 each have a certain length in the third direction DC. In other words, the first protruding portion 51 and the second protruding portion 52 each have a certain width in the third direction DC. For example, the first protruding portion 51 and the second protruding portion 52 may extend long in the third direction DC, or may be a collection of portions continuously arranged in the third direction DC. According to the first protrusion 51 and the second protrusion 52, the first power storage element module 20A and the second power storage element module 20B can be stably maintained in a stacked state. Thereby, the vibration resistance of the power storage element unit 10 and the power storage element module 20 can be improved.

In particular, in the illustrated example, the width of each first protrusion 51 along the second direction DB is shorter than the width of the first protrusion 51 along the third direction DC. Further, the width of each of the second protruding portions 52 along the second direction DB is shorter than the width of the second protruding portion 52 along the third direction DC. According to such an example, while securing a sufficient space between the first protruding portion 51 and the second protruding portion 52 to stably promote heat dissipation, the first power storage element module 20A and the second The power storage element modules 20B can be stably maintained in a stacked state.

In the illustrated example, a plurality of first protrusions 51 arranged in the third direction DC which is the longitudinal direction of the cell 30 are provided. Further, a plurality of second protrusions 52 arranged in the third direction DC which is the longitudinal direction of the cell 30 are provided. According to such an example, the first power storage element module 20A and the second power storage element module 20B can be stably maintained in a stacked state. Thereby, the vibration resistance of the power storage element module combination 15 and the power storage element unit 10 can be improved. In the illustrated example, four first protruding portions 51 are provided, and four second protruding portions 52 are provided.

Further, in the illustrated example, the first protruding portion 51 and the second protruding portion 52 are provided on the case 40. More specifically, the first protruding portion 51 and the second protruding portion 52 are provided on the side wall portion 44 of the case 40. Therefore, as shown in FIG. 16, the second power storage element module 20B can be separated from the cover 60 of the first power storage element module 20A. According to this example, as described above, it is possible to effectively prevent the second power storage element module 20B from pressing the plurality of cells 30 of the first power storage element module 20A through the cover 60. Can be done. As a result, damage to the cell 30 of the power storage element module 20 can be effectively avoided.

As a specific configuration, the first protrusion 51 is located on one side SB1 in the second direction DB. The second protruding portion 52 is located on the other side of the second direction DB. The first protruding portion 51 has a protruding portion support portion 51a protruding from the side wall portion 44 to the other side in the first direction DA. The projecting portion support portion 51a contacts the power storage element module 20 adjacent to the first direction DA and supports the power storage element module 20 from one side SA1 in the first direction DA. Similarly, the second protruding portion 52 has a protruding portion support portion 52a protruding from the side wall portion 44 to the other side in the first direction DA. The projecting portion support portion 52a contacts the power storage element module 20 adjacent to the first direction DA, and supports the power storage element module 20 from one side SA1 in the first direction DA.

In the illustrated example, the protrusion support portion 51a and the protrusion support portion 52a have a plurality of inner ribs 53 extending from the bottom portion 42 to the other side in the first direction DA. The inner rib 53 extends beyond the side wall portion 44 to the other side in the first direction DA. A plurality of inner ribs 53 forming one projecting portion support portion 51a are provided at intervals in the third direction DC. Each inner rib 53 is a plate-shaped portion extending in the first direction DA and the second direction DB. The inner rib 53 has a function of reinforcing the case 40.

Further, the first protruding portion 51 further has a guide portion 51b connected to the protruding portion support portion 51a. The guide portion 51b comes into contact with a portion mounted on the protruding portion support portion 51a of the power storage element module 20 located adjacent to the guide portion 51b, and the first direction DA of the two power storage element modules 20 stacked in the first direction DA. Relative movement in a direction non-parallel to, in particular, relative movement to a second direction DB or a third direction DC orthogonal to the first direction DA is regulated. As a specific configuration, the guide portion 51b has a space above the protrusion support portion 51a, in other words, a space on the other side of the protrusion support portion 51a in the first direction DA, whichever is orthogonal to the first direction DA. Surrounded from the direction of. In the illustrated example, the guide portion 51b surrounds the space above the protrusion support portion 51a from three sides. More specifically, the guide portion 51b surrounds the space above the protrusion support portion 51a from one side SB1 in the second direction DB and both sides in the third direction DC.

Similarly, the second protruding portion 52 further has a guide portion 52b connected to the protruding portion supporting portion 52a. The guide portion 52b comes into contact with a portion mounted on the protruding portion support portion 52a of the power storage element module 20 located adjacent to the guide portion 52b, and the first direction DA of the two power storage element modules 20 stacked in the first direction DA. Relative movement in a direction non-parallel to, in particular, relative movement to a second direction DB or a third direction DC orthogonal to the first direction DA is regulated. As a specific configuration, the guide portion 52b has a space above the protrusion support portion 52a, in other words, a space on the other side of the protrusion support portion 52a in the first direction DA, whichever is orthogonal to the first direction DA. Surrounded from the direction of. In the illustrated example, the guide portion 52b surrounds the space above the protrusion support portion 52a from three sides. More specifically, the guide portion 52b surrounds the space above the protrusion support portion 52a from the other side in the second direction DB and both sides in the third direction DC.

The second power storage element module 20B, which is in contact with the first power storage element module 20A having such a first protrusion 51 and the second protrusion 52 from the other side in the first direction DA, is the first protrusion 51. It has a first engaging portion 56 that comes into contact with the second engaging portion 56 and a second engaging portion 57 that comes into contact with the second protruding portion 52. The contact between the first protruding portion 51 and the first engaging portion 56 not only regulates the relative movement of the two adjacent power storage element modules 20 to the first direction DA, but is also non-parallel to the first direction DA. Relative movement in any direction can also be regulated. Similarly, the contact between the second protruding portion 52 and the second engaging portion 57 not only regulates the relative movement of the two adjacent power storage element modules 20 to the first direction DA, but also restricts the relative movement of the two adjacent storage element modules 20 to the first direction DA, as well as the first direction DA. Relative movement in a direction non-parallel to is also regulated. According to such a configuration, the first power storage element module 20A and the second power storage element module 20B are stably maintained in a stacked state, and the first power storage element module 20A and the second power storage element module 20B are maintained. Relative movement can be regulated. That is, the seismic resistance of the power storage element module combination 15 and the power storage element unit 10 can be improved. In the illustrated example, four first engaging portions 56 are provided, and four second engaging portions 57 are provided.

In the illustrated example, the first engaging portion 56 and the second engaging portion 57 have a bulging restricting portion 58 that bulges outward in the second direction DB from the main wall portion 44a of the side wall portion 44. There is. The bulge restricting portion 58 extends in the first direction DA from a position connected to the bottom portion 42 to a position connected to the outer wall portion 44b of the side wall portion 44 in the first direction DA. As can be understood from FIG. 14, an inner rib 53 is arranged in the bulge control portion 58. The bulge restricting portion 58 forming the first engaging portion 56 bulges from the main wall portion 44a toward the one side SB1 in the second direction DB. The bulge restricting portion 58 forming the second engaging portion 57 bulges from the main wall portion 44a toward the other side in the second direction DB.

In the illustrated example, the bulge restricting portion 58 forming the first engaging portion 56 mounted on the protruding portion supporting portion 51a of the first protruding portion 51 is provided by the guide portion 51b connected to the protruding portion supporting portion 51a. , Surrounded from three sides. More specifically, the swelling regulating portion 58 is surrounded by the guide portion 51b from one side SB1 in the second direction DB and both sides in the third direction DC. Therefore, the first engaging portion 56 is restricted from moving relative to the first protruding portion 51 to the one side SB1 in the second direction DB and is restricted from moving relative to the first protruding portion 51 to the third direction DC. .. Similarly, the bulge restricting portion 58 forming the second engaging portion 57 mounted on the protruding portion supporting portion 52a of the second protruding portion 52 is provided from three sides by the guide portion 52b connected to the protruding portion supporting portion 52a. Surrounded. More specifically, the swelling regulating portion 58 is surrounded by the guide portion 52b from the other side in the second direction DB and both sides in the third direction DC. Therefore, the second engaging portion 57 is restricted from moving relative to the second protruding portion 52 to the one side SB1 in the second direction DB and is restricted from moving relative to the second protruding portion 52 to the third direction DC. .. According to the power storage element module combination 15 and the power storage element unit 10, the first power storage element module 20A and the second power storage element module 20B are stably maintained in a stacked state, and the first power storage element is stably maintained. The relative movement of the module 20A and the second power storage element module 20B to the second direction DB and the third direction DC can be effectively regulated.

As already described, the first protrusion 51 and the second protrusion 51 and the second in the second direction DB, which are the regions between the first power storage element module 20A and the second power storage element module 20B in the first direction DA. The heat transfer member 25 may be provided in the region between the protrusions 52. By providing the heat transfer member 25, heat dissipation from the first power storage element module 20A and the second power storage element module 20B can be effectively promoted. That is, it is possible to suppress the temperature rise of the power storage element module 20 and make the power storage element module 20 function effectively.

Further, it is a region between the first power storage element module 20A and the second power storage element module 20B in the first direction DA, and between the first protrusion 51 and the second protrusion 52 in the second direction DB. The region to be formed may be a void V. Even with such a configuration, heat dissipation from the first power storage element module 20A and the second power storage element module 20B can be effectively promoted. That is, it is possible to suppress the temperature rise of the power storage element module 20 and make the power storage element module 20 function effectively.

Next, the configuration of the notch C provided in the side wall 44 of the case 40 and the side wall 44 related to the notch C will be described, and then the tab block 70 and the electrode member 80 will also be described.

For example, as shown in FIG. 14, the side wall portion 44 is provided with a pair of notches C. Each notch C is formed in the notch forming wall portion 45 extending along the second direction DB in the side wall portion 44. The notch C is provided at a central position in the second direction DB of the corresponding notch forming wall portion 45. As shown in FIGS. 11 and 13, the pair of tabs 35 of the cell 30 extend into the notch C from the internal space of the case 40. Due to the symmetry of the shape of the cell 30 described above, one tab 35 enters the one notch C and the other tab 35 enters the other notch C regardless of the arrangement of the cell 30 in the case 40. More specifically, regardless of whether the central portion 31C of the cell 30 projects toward one side SA1 or the other side of the first direction DA, and the tab 35 serving as the positive electrode terminal of the cell 30 is the second. One tab 35 enters one notch C and the other tab 35 enters the other notch C, regardless of whether it extends towards one side SB1 or the other side in the directional DB.

In the illustrated example, the side wall 44 further includes a notch guide wall 46 connected to the notch forming wall 45. The notch guide wall portion 46 extends outward in the third direction DC from a position adjacent to the notch C of the notch forming wall portion 45. In other words, the notch guide wall portion 46 extends to the side away from the space accommodating the cell 30 of the case 40. The notch guide wall portion 46 extends in the third direction DC. Notch guide wall portions 46 are provided on both sides of the notch C in the second direction DB for one notch C. Therefore, each tab 35 is arranged between the pair of notch guide wall portions 46, and is guided by the notch guide wall portions 46 and extends in the third direction DC. According to such a notch guide wall portion 46, the cell 30 can be stably held in the case 40. In particular, since the position of the tab 35 that functions as a terminal is stable, the seismic resistance of the power storage element module 20 and the power storage element unit 10 can be effectively improved.

As shown in FIG. 15, each notch guide wall portion 46 has a first rib 46a and a second rib 46b. The first rib 46a and the second rib 46b are provided on the outer surface (the side of the second direction DB that is separated from the center of the case 40) of the corresponding notch guide wall portion 46 in the second direction DB, respectively. The first rib 46a and the second rib 46b each project outward from the corresponding notched guide wall portion 46 in the second direction DB. The first rib 46a and the second rib 46b extend in the first direction DA. In the illustrated example, the first rib 46a and the second rib 46b extend over the entire length of the notch guide wall portion 46 along the first direction DA. The second rib 46b is located outside of the first rib 46a in the third direction DC (from the side separated from the center of the case 40 in the third direction DC, in other words, from the space accommodating the cell 30 of the case 40 in the third direction DC). It is located on the side to be separated). The first rib 46a is located between the notched guide wall portion 46 and the second rib 46b in the third direction DC.

By such ribs 46a and 46b, a first recess 48a and a second recess 48b are formed in the notch guide wall portion 46. The first recess 48a is formed between the notch guide wall portion 46 and the first rib 46a. The second recess 48b is formed between the first rib 46a and the second rib 46b. The first recess 48a and the second recess 48b are open to the outside of the second direction DB (the side of the second direction DB that is separated from the center of the case 40). Therefore, the notch guide wall portion 46 is located so as to face the openings of the first recess 48a and the second recess 48b. The first recess 48a and the second recess 48b extend along the second direction DB.

Further, in the illustrated example, the first recess 48a and the second recess 48b extend over the entire length of the notch guide wall portion 46 along the first direction DA. The first recess 48a and the second recess 48b are also open to the other side in the first direction DA. The bottom portion 42 is located at a position facing the opening to the other side in the first direction DA of the first recess 48a and the second recess 48b.

Next, the tab block 70 will be described. The tab block 70 is arranged between the tabs of two cells 30 adjacent to the first direction DA, which is the stacking direction of the cells 30. The tab block 70 is made of an insulating material. The tab block 70 can be, for example, a resin molded product. The tab block 70 insulates between the tabs 35 of the two cells 30 stacked adjacent to each other in the first direction DA. Further, the tab block 70 described below also has a function of positioning the cell 30 with respect to the case 40.

As described with reference to FIG. 10, in the illustrated example of the power storage element module 20, the first cell 30A to the 16th cell 30P are stacked along the first direction DA. Then, in the one-sided SC1 in the third direction DC, the tabs 35 are insulated from each other between the second cell 30B and the third cell 30C, and the tabs 35 are insulated from each other between the sixth cell 30F and the seventh cell 30G. The tabs 35 are insulated from each other between the 10th cell 30J and the 11th cell 30K, and the tabs 35 are insulated from each other between the 14th cell 30N and the 15th cell 30O. Therefore, as shown in FIG. 16, in one side SC1 in the third direction DC, between the second cell 30B and the third cell 30C, between the sixth cell 30F and the seventh cell 30G, and the tenth cell 30J. A tab block 70 is provided between the 11th cell 30K and the 14th cell 30N and the 15th cell 30O.

Further, in the illustrated example, on the other side in the third direction DC, the tabs 35 are insulated from each other between the fourth cell 30D and the fifth cell 30E, and between the eighth cell 30H and the ninth cell 30I. The tabs 35 are insulated from each other, and the tabs 35 are insulated from each other between the 12th cell 30L and the 13th cell 30M. Therefore, as shown in FIG. 16, on the other side of the third direction DC, between the fourth cell 30D and the fifth cell 30E, between the eighth cell 30H and the ninth cell 30I, and between the tenth cell 30J and the tenth cell 30J. A tab block 70 is provided between the 11th cell 30K and the 12th cell 30L and the 13th cell 30M.

The tab block 70 as a specific example shown in FIG. 18 is connected to the insulating base portion 71 arranged in the notch C, the inner portion 72 and the outer portion 73 connected to the insulating base portion 71, and the outer portion 73. It has a connection guide unit 74 and. The insulation base 71 is located between the tabs 35 of the two cells 30 to be stacked in the first direction DA. In the illustrated example, the insulating base portion 71 is located between the pair of notched guide wall portions 46 of the side wall portions 44. When the insulating base portion 71 comes into contact with the notch guide wall portion 46, the insulating base portion 71 is restricted from moving to the second direction DB with respect to the case 40.

The inner portion 72 is connected to the insulating base portion 71 from the inner side in the third direction DC (the side close to the center of the case 40 in the third direction DC). The inner portion 72 is located in a space for accommodating the cell 30 surrounded by the case 40, particularly in a space for accommodating the exterior body 33. The width of the inner portion 72 along the second direction DB is wider than the width of the insulating base portion 71 along the second direction DB. Further, the width of the inner portion 72 along the second direction DB is wider than the width of the notch C along the second direction DB. In particular, the inner portion 72 extends outward in the second direction DB than the notched guide wall portion 46. Therefore, when the inner portion 72 comes into contact with the side wall portion 44 (particularly the notch guide wall portion 46 and the notch forming wall portion 45), the tab block 70 moves relative to the outside in the third direction DC with respect to the case 40. Can be regulated.

The outer portion 73 is connected to the insulating base portion 71 from the outside in the third direction DC (the side separated from the center of the case 40 in the third direction DC). The outer portion 73 is located in a space for accommodating the cell 30 surrounded by the case 40. The width of the outer portion 73 along the second direction DB is wider than the width of the insulating base portion 71 along the second direction DB. Further, the width of the outer portion 73 along the second direction DB is wider than the width of the notch C along the second direction DB. In particular, the outer portion 73 extends outward in the second direction DB than the notched guide wall portion 46. Therefore, when the outer side portion 73 comes into contact with the side wall portion 44 (particularly the notch guide wall portion 46), it is possible to restrict the tab block 70 from moving inward in the third direction DC with respect to the case 40.

In the illustrated example, the thickness of the outer portion 73 along the first direction DA is thinner than the thickness of the insulating base portion 71 along the first direction DA. Similarly, the thickness of the outer portion 73 along the first direction DA is thinner than the thickness of the inner portion 72 along the first direction DA. On the other hand, as described with reference to FIGS. 9 and 10, the illustrated tab 35 has a base end portion 35A extending outward in the first direction DA from the exterior body 33 and a base end portion 35A. It has a bent tip portion 35B. The tip 35B extends in the first direction DA. The thin outer portion 73 is arranged at a position facing the tip portion 35B from the first direction DA. As a result, the tab block 70 can pass between the tip portions 35B of the tab 35 whose gap is narrowed along the first direction DA. From the viewpoint of insulating the two tabs 35, it is preferable that the outer portion 73 also has an insulating property.

A pair of connection guide portions 74 are provided in each tab block 70. The connection guide portion 74 is arranged at a position facing the notch guide wall portion 46 from both outer sides in the second direction DB. That is, the notch guide wall portion 46 on the side corresponding to the connection guide portion 74 is located between each connection guide portion 74 and the insulation base portion 71. Each connection guide portion 74 has a connection protrusion piece 75. The connecting projecting piece 75 is a plate-shaped portion extending in the first direction DA and the second direction DB.

Each connecting projecting piece 75 projects inward in the second direction DB, that is, toward the notch guide wall portion 46. As shown in FIG. 20, the connecting projecting piece 75 is inserted into the groove-shaped first recess 48a formed between the notch forming wall portion 45 and the first rib 46a. Here, FIG. 20 is a perspective view showing one tab block 70 and the electrode member 80 provided on the tab block 70 together with the case 40 by removing the cell 30.

The connecting protruding piece 75 can move the first concave portion 48a as a convex portion 76. The first recess 48a extends in the first direction DA. The convex portion 76 formed by the connecting projecting piece 75 is movable in the first concave portion 48a in the first direction DA. On the other hand, when the convex portion 76 formed by the connecting projecting piece 75 comes into contact with the notch forming wall portion 45 and the first rib 46a, the relative movement of the tab block 70 to the case 40 in the third direction DC is restricted. To. Further, when the convex portion 76 formed by the connecting projecting piece 75 contacts the notch guide wall portion 46, or when the convex portion 76 contacts the first rib 46a or the second rib 46b, the tab block 70 Relative movement to the second direction DB with respect to the case 40 is restricted.

As shown in FIG. 13, the convex portions 76 of the plurality of tab blocks 70 arranged in the first direction DA are contained in one first recess 48a extending along the first direction DA. Then, the case 40 allows the tab block 70 to move relative to the case 40 in the first direction DA, and regulates the relative movement of the tab block 70 to the second direction DB and the third direction DC with respect to the case 40. It holds a plurality of tab blocks 70.

The tab block 70 is formed using an insulating material. The insulating base portion 71, the inner portion 72, the outer portion 73, and the connection guide portion 74 of the tab block 70 may be integrally molded using an insulating resin.

By the way, as schematically shown in FIG. 12, the tab block 70 is provided at a position deviated from the central portion 31C of the cell 30 along a direction orthogonal to the first direction DA, which is the stacking direction of the cells 30. .. In the illustrated example, the tab block 70 is provided at a position deviated from the central portion 31C along the third direction DC orthogonal to the first direction DA. That is, the tab block 70 does not overlap the central portion 31C of the cell 30 in the projection to the first direction DA. In particular, in the illustrated example, the tab block 70 is placed between the tabs 35 of two adjacent cells 30 to be insulated so that it overlaps only the peripheral edge 31E of the cell 30 in projection to the first direction DA. positioned.

By interposing an insulating tab block 70 between the tabs 35 of the two cells 30 at a position deviated from the central portion 31C in this way, the tabs 35 of the two adjacent cells 30 to be insulated are insulated. Can be done. Further, by interposing the tab block 70, the bending of the peripheral portions 31E of the plurality of cells 30 can be effectively prevented, and the posture of the peripheral portions 31E of the cells 30 can be maintained. Therefore, the movement of the tab 35 due to the bending of the cell 30 or the like can be effectively regulated, and thereby the tab block 70 can stably secure the insulation of the tab 35 of the two adjacent cells 30. it can. Further, by arranging the tab block 70 at a position not facing the central portion 31C of the cell 30, the two cells 30 insulated by the tab block 70 are brought close to each other so that the central portion 31C is close to each other in the first direction DA. , Can be placed. As a result, the insulation of the two cells 30 can be stably secured, and the power storage element module 20 including the plurality of cells 30 can be miniaturized.

In addition, since it is possible to effectively prevent bending at the peripheral edges of the plurality of cells 30, it is also possible to effectively avoid unintended damage to the cells.

In addition, the case 40 allows the tab block 70 to move relative to the case 40 in the first direction DA. On the other hand, the case 40 regulates the relative movement of the tab block 70 in a direction non-parallel to the first direction DA, particularly in the second direction DB or the third direction DC orthogonal to the first direction DA. When the case 40 supports the tab block 70 in this way, the tab block 70 supported by the case 40 moves to the first direction DA, which is the stacking direction of the cells 30, following the variation in the thickness of the cells 30. be able to. As a result, insulation using the tab block 70 can be stably secured.

Further, the tab block 70 is arranged at least partially in the notch C formed in the side wall portion 44 of the case 40. According to such a configuration, the relative movement of the tab block 70 with respect to the case 40 can be effectively suppressed. As a result, the tabs 35 of the two adjacent cells 30 arranged close to each other can be insulated by a simple configuration.

Further, the tab block 70 is supported by the side wall 44, and the cell 30 is housed in a space partitioned by the side wall 44 supporting the tab block 70. According to such a configuration, the relative movement between the cell 30 and the tab block 70 can be effectively suppressed. Therefore, the tabs 35 of the two adjacent cells 30 arranged close to each other can be stably insulated by a simple configuration.

Further, the side wall portion 44 has a first recess 48a extending in the first direction DA, which is the stacking direction of the cells 30, and the tab block 70 is inserted into the first recess 48a and is first with respect to the first recess 48a. It has a convex portion 76 that can move relative to the direction DA. According to such a configuration, the tab block 70 can move to the first direction DA following the thickness variation of the cell 30. As a result, stable insulation can be ensured while adopting a simple configuration.

However, the present invention is not limited to the above-mentioned example, and the convex portion 76 formed by the connecting projecting piece 75 of the tab block 70 may be inserted into the second concave portion 48b instead of the first concave portion 48a. Further, unlike the above-mentioned example, the tab block 70 has a recess extending in the first direction DA which is the stacking direction of the cells 30, and the side wall portion 44 is inserted into the recess of the tab block 70 and the tab block 70. It may have a convex portion that can move relative to the concave portion in the first direction DA. Similar effects can be obtained by these modified examples.

Further, in the illustrated example, a cell in which the first exterior material 34A having the bulging portion 34AP faces one side SA1 in the first direction DA and the second exterior material 34B faces the other side in the first direction DA, and a second. Cells with the exterior material 34B facing one side SA1 in the first direction DA and the first exterior material 34A facing the other side in the first direction DA are alternately laminated on the first direction DA. Then, as shown in FIG. 12, the tab block 70 is arranged between two cells in which the first exterior material 34A is laminated so as to face each other. According to such a configuration, the central portion 31C of the two cells 30 can be arranged so as to be close to the first direction DA while ensuring the insulation of the tabs 35 of the two adjacent cells 30. That is, the thickness of the plurality of stacked 30 first-direction DAs can be reduced. Further, it is possible to prevent the peripheral portions 31E of the plurality of cells 30 from bending and maintain the posture of the cells 30. As a result, the insulation of the two cells 30 can be stably secured, and unintended damage to the cells 30 can be effectively avoided.

As shown in FIG. 12, in such a configuration, the thickness Tx of the tab block 70 along the first direction DA is not more than twice the protrusion length Lx in the central portion 31C of the cell 30 in the first direction DA. Is preferable. By setting the thickness Tx of the tab block 70 in such a range, the thickness of the power storage element module 20 can be reduced. Further, from the viewpoint of preventing the peripheral portion 31E of the cell 30 from bending, the thickness Tx of the tab block 70 along the first direction DA is larger than the protruding length Lx at the central portion 31C of the cell 30 in the first direction DA. Is preferable. In the illustrated example, the protruding length Lx at the central portion 31C of the cell 30 in the first direction DA corresponds to the protruding length of the first exterior material 34A at the bulging portion 34AP in the first direction DA.

Here, FIG. 21 is a view corresponding to FIG. 13 and is a perspective view showing a state in which the first cell 30A and the second cell 30B are removed. As shown in FIG. 21 and schematically shown in FIG. 12, the inner portion 72 of the tab block 70 supported by the case 40 is located on the outer side in the third direction DC (the side away from the center in the third direction DC). ) To the central portion 31C of the cell 30, the movement of the cell 30 with respect to the case 40 in the direction orthogonal to the first direction DA can be restricted. In other words, the side wall portion 44 comes into contact with the central portion 31C of the plurality of cells 30 via the tab block 70, so that the side wall portion 44 is orthogonal to the first direction DA of the plurality of cells 30, particularly orthogonal to the first direction DA. Regulate the movement to the third direction DC. With such a configuration, a plurality of cells 30 can be stably held in the case 40. In particular, the central portion 31C of the cell 30 has a certain length in the first direction DA. Therefore, the contact between the tab block 70 and the central portion 31C of the cell 30 can stably regulate the relative movement of the cell 30 with respect to the case 40 along the direction orthogonal to the first direction DA.

As shown in FIG. 12, in such a configuration, the thickness Tx of the tab block 70 along the first direction DA is preferably larger than the protrusion length Lx at the central portion 31C of the cell 30 in the first direction DA. By setting the thickness in such a range, the relative movement of a large number of cells 30 included in the power storage element module 20 with respect to the case 40 can be regulated more stably.

Next, the electrode member 80 will be described in more detail. The electrode member 80 is electrically connected to the tabs 35 of two or more cells 30 adjacent to the first direction DA, which is the stacking direction of the cells 30. The tab 35 is formed using a conductive material, typically metal.

The electrical connection of the first cell 30A to the 16th cell 30P included in the illustrated example of the power storage element module 20 has already been described with reference to FIG. Then, as shown in FIG. 12, the tabs 35 forming the positive electrode terminals of the two adjacent power storage element modules 20 laminated in the first direction DA so that the second exterior material 34B faces each other are attached to the electrode member 80. It is fixed and electrically connected. Further, the tabs 35 forming the negative electrode terminals of the two adjacent power storage element modules 20 laminated in the first direction DA so that the second exterior material 34B faces each other are fixed to the electrode member 80 and electrically connected to each other. Has been done.

Further, in the example shown in FIG. 12, the tabs 35 of the third cell 30C, the fourth cell 30D, the fifth cell 30E, and the sixth cell 30F are electrically connected to each other in the one-side SC1 in the third direction DC. However, it is fixed to the same electrode member 80. Further, the tabs 35 of the 7th cell 30G, the 8th cell 30H, the 9th cell 30I and the 10th cell 30J are electrically connected to each other and fixed to the same electrode member 80. Further, the tabs 35 of the 11th cell 30K, the 12th cell 30L, the 13th cell 30M, and the 14th cell 30N are electrically connected to each other and fixed to the same electrode member 80.

Further, in the example shown in FIG. 12, on the other side of the third direction DC, the first cell 30A, the second cell 30B, the third cell 30C, and the fourth cell 30D are electrically connected to each other and are the same. It is fixed to the electrode member 80. The fifth cell 30E, the sixth cell 30F, the seventh cell 30G, and the eighth cell 30H are electrically connected to each other and fixed to the same electrode member 80. The ninth cell 30I, the tenth cell 30J, the eleventh cell 30K, and the twelfth cell 30L are electrically connected to each other and fixed to the same electrode member 80. The 13th cell 30M, the 14th cell 30N, the 15th cell 30O, and the 16th cell 30P are electrically connected to each other and fixed to the same electrode member 80.

An example of the electrode member 80 shown in FIG. 19 is a bent plate-like material. The electrode member 80 has an elongated conduction base portion 81, a pair of connecting portions 82 connected to the conduction base portion 81, and a pair of connecting end portions 83 connected to the connecting portion 82. Such an electrode member 80 can be manufactured by bending an elongated metal plate material.

The conduction base portion 81 is elongated in the second direction DB. The conduction base portion 81 is a plate-shaped portion that extends in the first direction DA and the second direction DB. The conduction base portion 81 is arranged at a position facing the notch C of the case 40 from the outside in the third direction DC (the side separated from the space accommodating the cell 30 in the third direction DC). The conduction base portion 81 is provided with a screw hole for fixing a screw used for connecting wiring or the like.

The connecting portion 82 is connected to both ends of the conduction base portion 81 in the second direction DB. The connecting portion 82 is a plate-shaped portion extending in the first direction DA and the third direction DC. The connection end 83 is connected to the inner end (the side of the space accommodating the cell 30 in the third direction DC) of the connection 82 in the third direction DC. The connection end portion 83 is a plate-shaped portion extending in the first direction DA and the second direction DB. The connection end portion 83 faces the conduction base portion 81 from the inside in the third direction DC (the side of the space accommodating the cell 30 in the third direction DC).

Each connection end 83 faces the notched guide wall 46 of the side wall 44 of the case 40 in the second direction DB. Each connection end 83 projects inward in the second direction DB, i.e. towards the notch guide wall 46. The connection end 83 shown in FIG. 20 is inserted into a groove-shaped second recess 48b formed between the first rib 46a and the second rib 46b. Further, the connection end portion 83 can also be inserted into the groove-shaped first recess 48a formed between the notch forming wall portion 45 and the first rib 46a. By inserting the connection end portion 83 into the first recess 48a or the second recess 48b, the electrode member 80 is held by the case 40. When the connection end portion 83 is inserted into the second recess 48b, the electrode member 80 is located outside in the third direction DC as compared with the case where the connection end portion 83 is inserted into the second recess 48b. ..

The connection end portion 83 can move the first concave portion 48a and the second concave portion 48b as the convex portion 84. As described above, the first recess 48a and the second recess 48b extend in the first direction DA. The convex portion 84 formed by the connection end portion 83 can move in the first recess 48a in the first direction DA, and can move in the second recess 48b in the first direction DA. ing. On the other hand, the convex portion 84 formed by the connecting end portion 83 comes into contact with the notch forming wall portion 45, the first rib 46a, and the second rib 46b, so that the electrode member 80 moves to the third direction DC with respect to the case 40. Relative movement is regulated. Further, when the convex portion 84 formed by the connecting end portion 83 comes into contact with the notch guide wall portion 46, or when the connecting portion 82 comes into contact with the first rib 46a or the second rib 46b, the electrode member 80 Relative movement to the second direction DB with respect to the case 40 is restricted.

As shown in FIG. 13, the convex portions 84 of the plurality of electrode members 80 arranged in the first direction DA are inserted into one first concave portion 48a or the second concave portion 48b extending along the first direction DA. Can be done. In this case, the case 40 allows the electrode member 80 to move relative to the case 40 in the first direction DA, and regulates the relative movement of the electrode member 80 to the second direction DB and the third direction DC with respect to the case 40. Therefore, a plurality of electrode members 80 are held.

As described above, the tab 35 has a base end portion 35A extending from the exterior body 33 and a tip end portion 35B bent with respect to the base end portion 35A. The tip ends 35B of the two or more tabs that are electrically connected to the electrode member 80 are fixed to the conduction base portion 81 in a state of being in surface contact with each other on the conduction base portion 81 of the electrode member 80. According to such a configuration, the tabs 35 to be electrically connected are stably maintained in a surface contact state, so that the electrical connection between the two tabs 35 can be stably secured. .. Further, the relative movement between the cell 30 including the tab 35 and the electrode member 80 can be stably regulated.

In particular, in the illustrated example, the base end 35A of the tab 35 extends in a direction orthogonal to the first direction DA (particularly the third direction DC), and the tip end 35B extends in the first direction DA. Therefore, the electrical connection between the tabs 35 of the two adjacent cells 30 can be stably secured. Further, the relative movement of the cell 30 including the tab 35 and the electrode member 80, particularly the relative movement in the direction orthogonal to the first direction DA can be regulated more stably.

As schematically shown in FIG. 12, the electrode member 80 is positioned at a position deviated from the central portion 31C of the cell 30 along a direction orthogonal to the first direction DA, which is the stacking direction of the cell 30, like the tab block 70. It is provided in. In the illustrated example, the electrode member 80 is provided at a position deviated from the central portion 31C along the third direction DC orthogonal to the first direction DA. That is, the electrode member 80 does not overlap with the central portion 31C of the cell 30 in the projection to the first direction DA. In particular, in the illustrated example, the electrode member 80 is a tab 35 of two adjacent cells 30 to be electrically connected so as to overlap only the peripheral edge 31E of the cell 30 in projection to the first direction DA. It is located between.

By interposing the electrode member 80 between the tabs 35 of the two cells 30 at a position deviated from the central portion 31C in this way, the bending of the peripheral portions 31E of the two cells 30 is effectively prevented and the cell 30 is prevented from bending. Can maintain the posture of. Therefore, it is possible to effectively avoid an unintended short circuit of the tab 35, for example, a short circuit caused by contact between the tab 35 of one cell 30 and the exterior body 33 of the other cell 30. Further, by arranging the electrode member 80 at a position not facing the central portion 31C of the cell 30, the plurality of cells 30 can be laminated so that the central portion 31C of the cell 30 is close to each other in the stacking direction. As a result, the electrical connection between the two cells 30 can be stably secured, and the power storage element module 20 including the plurality of cells 30 can be miniaturized. In addition, since it is possible to effectively prevent bending at the peripheral edges of the plurality of cells 30, it is also possible to effectively avoid unintended damage to the cells 30 and the like.

The electrode member 80A electrically connected to the tab 35 forming the positive electrode terminal of the first cell 30A and the second cell 30B is provided between the second cell 30B and the third cell 30C to be insulated from each other. .. Similarly, the electrode member 80B electrically connected to the tab 35 forming the negative electrode terminal of the 15th cell 30O and the 16th cell 30P is provided between the 14th cell 30N and the 15th cell 30O to be insulated from each other. There is. The tab block 70 described above is also provided between the two cells 30 in which the electrode member 80A and the electrode member 80B are arranged.

The electrode member 80A is located between the tab block 70 and the second cell 30B in the first direction DA. The tab block 70 is located between the electrode member 80A and the third cell 30C, and insulates the electrode member 80A from the third cell 30C. The electrode member 80B is located between the tab block 70 and the 15th cell 30O in the first direction DA. The tab block 70 is located between the electrode member 80A and the 14th cell 30N, and insulates the electrode member 80A from the 14th cell 30N.

The electrode member 80A and the electrode member 80B are provided on the outer portion 73 of the tab block 70. As described above, the thickness of the outer portion 73 is reduced. Further, the thickness of the electrode member 80 along the first direction DA is thinner than the maximum thickness of the tab block 70 along the first direction DA. In the illustrated example, the thickness of the electrode member 80 along the first direction DA is thinner than the thickness of the insulating base portion 71 of the tab block 70. Then, as shown in FIG. 12, the electrode member 80A and the electrode member 80B are located in the region where the tab block 70 is arranged in the first direction DA. That is, the tab block 70 separates the two cells 30 from each other in the first direction DA in the insulating base portion 71 or the inner portion 72 while securing the arrangement space of the electrode member 80 in the outer portion 73, and the two cells. The insulation of the tabs 35 of 30 is secured.

On the other hand, the electrode members 80 other than the electrode members 80A and the electrode members 80B are arranged between the two cells 30 to be electrically connected to each other in the first direction DA. Then, the tip end portion 35B of the tab 35 located on one side SA1 (for example, the lower side) in the first direction DA of the two electrically connected cells 30 is relative to the base end portion 35A of the tab 35. It is bent and extends from the base end portion 35A of the tab 35 to the other side (for example, the upper side) in the first direction DA. The tip 35B of the tab 35 located on the other side (for example, the upper side) of the two electrically connected cells in the first direction DA bends with respect to the base end 35A of the tab 35, and the tab It extends from the base end portion 35A of 35 to one side (for example, the lower side) in the first direction DA. According to such a configuration, the cell 30 can effectively prevent the cell 30 from bending at the peripheral portion 31E having a reduced thickness, and can maintain the posture. By effectively preventing deformation such as bending in the cell 30, an unintended short circuit of the tab 35, for example, a short circuit caused by contact between the tab 35 of one cell 30 and the exterior body 33 of the other cell 30 is effective. Can be avoided.

As shown in FIG. 20, the convex portion 84 formed by the connecting end portion 83 of the electrode member 80A and the electrode member 80B is inserted into the second concave portion 48b of the side wall portion 44, and is inserted by the connecting protruding piece 75 of the tab block 70. The convex portion 76 to be formed is inserted into the first concave portion 48a of the side wall portion 44. For the electrode member 80 other than the electrode member 80A and the electrode member 80B, the convex portion 84 formed by the connecting end portion 83 may be inserted into the second concave portion 48b of the side wall portion 44, or as shown in the drawing, the convex portion 84 may be inserted into the second concave portion 48b. 1 It may be inserted into the recess 48a.

Further, the case 40 allows the electrode member 80 to move relative to the case 40 in the first direction DA, and regulates the relative movement of the electrode member 80 to the case 40 in the direction orthogonal to the first direction DA. Supports member 80. According to such a configuration, the electrode member 80 held in the case 40 can move in the stacking direction following the variation in the thickness of the cell 30, so that the electrode member 80 is electrically connected to the cell via the electrode member 80. Can be stably secured.

Further, the electrode member 80 is supported by a side wall portion 44 forming a notch C through which the tabs 35 of the plurality of cells 30 pass. According to such a configuration, the relative movement of the electrode member 80 with respect to the case 40 can be effectively suppressed. As a result, the tabs 35 of the two adjacent cells 30 can be electrically connected by a simple configuration. In particular, by restricting the relative movement of the tab 35 with respect to the side wall portion 44 of the case 40, the relative movement of the tab 35 and the electrode member 80 supported by the side wall portion 44 can be effectively suppressed. As a result, the electrical connection with the cell 30 can be stably secured.

Further, the side wall portion 44 of the case 40 has a first recess 48a and a second recess 48b extending in the first direction DA. The electrode member 80 has a convex portion 84 that is inserted into at least one of the first concave portion 48a and the second concave portion 48b and is movable relative to the concave portion in the first direction DA. According to such a configuration, the electrode member 80 held in the case 40 can move to the first direction DA following the variation in the thickness of the cell 30. As a result, it is possible to stably secure an electrical connection with the tab 35 of the cell 30 while adopting a simple configuration.

However, not limited to the above-mentioned example, the electrode member 80 has a recess extending in the first direction DA which is the stacking direction of the cells 30, and the side wall portion 44 is inserted into the recess of the electrode member 80 and the electrode member 80. It may have a convex portion that can move relative to the concave portion in the first direction DA. The same effect can be obtained by this modification.

Further, in the illustrated example, a cell in which the first exterior material 34A having the bulging portion 34AP faces one side SA1 in the first direction DA and the second exterior material 34B faces the other side in the first direction DA, and a second. Cells with the exterior material 34B facing one side SA1 in the first direction DA and the first exterior material 34A facing the other side in the first direction DA are alternately laminated on the first direction DA. Then, as shown in FIG. 12, the electrode member 80 is arranged between two cells in which the first exterior material 34A is laminated so as to face each other. According to such a configuration, the electrode member 80 is arranged between the tabs 35 of the two adjacent cells 30, and the electrical connection between the tabs 35 of the two cells 30 is stably secured. The central portion 31C of one cell 30 can be arranged so as to be close to the first direction DA. That is, the thickness of the plurality of stacked 30 first-direction DAs can be reduced. In addition, the posture can be maintained by preventing bending of the peripheral edges 31E of the plurality of cells 30. As a result, the electrical connection between the two cells 30 can be stably secured, and unintended damage to the cells 30 can be effectively avoided.

As shown in FIG. 12, in such a configuration, the thickness Ty of the tab block 70 along the first direction DA is not more than twice the protrusion length Lx in the central portion 31C of the cell 30 in the first direction DA. Is preferable. By setting the thickness Ty of the electrode member 80 in such a range, it is possible to reduce the thickness of the power storage element module 20. Further, from the viewpoint of preventing the peripheral portion 31E of the cell 30 from bending, the thickness Ty of the electrode member 80 along the first direction DA is larger than the protruding length Lx at the central portion 31C of the cell 30 in the first direction DA. Is preferable. In the illustrated example, the protruding length Lx at the central portion 31C of the cell 30 in the first direction DA corresponds to the protruding length of the first exterior material 34A at the bulging portion 34AP in the first direction DA.

In one embodiment described above, the power storage element module 20 is a case 40 that accommodates a plurality of cells 30 stacked in a first direction (stacking direction) DA and a plurality of cells 30 in the first direction. A case 40 having a bottom portion 42 supporting a plurality of cells 30 from one side SA1 in the DA and a side wall portion 44 rising from the bottom portion 42 in the first direction DA, and an opening of the case 40 opened to the other side in the first direction DA. Includes a cover 60 that covers the portion 40a. Then, the cover 60 is held in the case 40 so as to be movable in the first direction DA. According to such one embodiment, since the cover 60 attached to the case 40 can move in the first direction DA with respect to the case 40, it is possible to absorb the variation in the thickness of the cell 30. That is, a plurality of cells 30 can be stacked close to each other and stored in the case 40, and the cover 60 can be attached to the case 40. Therefore, the thickness of the power storage element module 20 can be reduced while the cell 30 is stably held and protected by the case 40 and the cover 60. Thereby, the energy efficiency of the power storage element module 20 and the power storage element unit 10 can be improved. Further, as an example, since the number of parts that do not require a spacer can be reduced and the structure can be simplified, the manufacturing cost of the power storage element module 20 and the power storage element unit 10 can be reduced and the productivity can be improved. ..

Further, in this one embodiment, the power storage element module combination 15 has a first power storage element module 20A and a second power storage element module 20B, and the side wall portion 44 of the first power storage element module 20A is a first. By contacting the case 40 of the second power storage element module 20B from one side in the one-way DA, the first power storage element module 20A and the second power storage element module 20B are stacked. Then, in a state where the first power storage element module 20A and the second power storage element module 20B are stacked, the cover 60 of the first power storage element module 20A is separated from the second power storage element module 20B. According to one such embodiment, the second power storage element module 20B stacked on the first power storage element module 20A is supported and covered on the side wall portion 44 of the first power storage element module 20A. It is separated from 60. Therefore, it is possible to effectively prevent the second power storage element module 20B from pressing the plurality of cells 30 of the first power storage element module 20A via the cover 60. As a result, damage to the cell 30 of the power storage element module 20 can be effectively avoided while arranging the plurality of power storage element modules 20 in a miniaturized space.

From another point of view, in one embodiment described above, the power storage element module combination 15 has a plurality of power storage element modules 20 stacked in the first direction (stacking direction) DA, and each power storage element module. 20 has a plurality of cells 30. The first power storage element module 20A included in the plurality of power storage element modules 20 contacts the second power storage element module 20B included in the plurality of power storage element modules 20 from one side SA1 in the first direction (stacking direction) DA. As a result, the first power storage element module 20A and the second power storage element module 20B are stacked. The first power storage element module 20A has a first protrusion 51 and a second protrusion 52 that protrude to the other side in the first direction DA and come into contact with the second power storage element module 20B. The first protruding portion 51 and the second protruding portion 52 are separated from each other by the second direction DB orthogonal to the first direction DA. Then, in the region between the first protrusion 51 and the second protrusion 52 in the second direction DB, the first power storage element module 20A and the second power storage element module 20B are separated from each other in the first direction DA. ing. According to such an embodiment, the first power storage element module 20A and the second power storage element module 20B are placed between the first protrusion 51 and the second protrusion 52 in the second direction DB. It is separated in the direction DA. That is, by blowing air into the space between the first power storage element module 20A and the second power storage element module 20B, or by arranging the heat transfer member 25, the first power storage element module 20A and the first power storage element module 20A and the first It is possible to effectively avoid the accumulation of heat in the power storage element module 20B of 2, and effectively promote heat dissipation from the first power storage element module 20A and the second power storage element module 20B. That is, it is possible to suppress the temperature rise of the power storage element module 20 and make the power storage element module 20 function effectively.

From yet another point of view, in one embodiment described above, the power storage element module 20 has a plurality of cells 30 stacked in the first direction (stacking direction) DA and one adjacent to the first direction DA. It has an insulating tab block 70, which is arranged between the tabs 35 of the two cells 30. Each cell 30 has a tab 35 on the peripheral edge portion 31E, and the thickness of the peripheral edge portion 31E is smaller than the thickness of the central portion 31C surrounded by the peripheral edge portion 31E. The insulating tab block 70 is provided at a position deviated from the central portion 31C along a direction orthogonal to the first direction DA. According to such an embodiment, by interposing the tab block 70 between the two cells 30, it is possible to effectively prevent the peripheral portions 31E of the plurality of cells 30 from bending and maintain the posture. .. Therefore, the tab block 70 can ensure the insulation of the tabs 35 of the two adjacent cells 30. Further, by arranging the tab block 70 at a position not facing the peripheral edge portion 31E of the cell 30, the two cells 30 insulated by the tab block 70 are arranged so that the central portion 31C thereof is close to the first direction DA. , Can be placed. As a result, the insulation of the two cells 30 can be stably secured, and the power storage element module 20 including the plurality of cells 30 can be miniaturized. As a result, the energy efficiency of the power storage element module 20 and the power storage element unit 10 can be improved. In addition, since it is possible to effectively prevent bending of the peripheral edges 31E of the plurality of cells 30, it is also possible to effectively avoid unintended damage to the cells 30 and the like.

From yet another point of view, in the embodiment described above, the power storage element module 20 is electrically connected to a plurality of cells 30 stacked in the first direction (stacking direction) DA and adjacent to each other in the first direction DA. It has two electrically connected cells 30 and an electrically connected electrode member (bus bar) 80, which is arranged between tabs 35 of two electrically connected cells 30. Each cell 30 has a tab 35 on the peripheral edge portion 31E, and the thickness of the peripheral edge portion 31E is smaller than the thickness of the central portion 31C surrounded by the peripheral edge portion 31E. The electrode member 80 is provided at a position deviated from the central portion 31C in a direction orthogonal to the first direction DA. According to one such embodiment, the two cells 30 can be stably and electrically connected by using the electrode member 80. Further, by arranging the electrode member 80 at a position not facing the central portion 31C of the cell 30, the central portion 31C of the two cells 30 electrically connected by the electrode member 80 is close to the first direction DA. It can be arranged in this way. As a result, the electrical connection between the two cells 30 can be stably secured, and the power storage element module 20 including the plurality of cells 30 can be miniaturized. As a result, the energy efficiency of the power storage element module 20 and the power storage element unit 10 can be improved. In addition, by interposing the electrode member 80 between the two cells 30, it is possible to effectively prevent bending of the peripheral edges 31E of the plurality of cells 30 and maintain the posture. Therefore, it is possible to effectively avoid an unintended short circuit of the cell 30, for example, contact between the tab 35 of one cell 30 and the exterior body 33 of the other cell 30.

Although one embodiment has been described by a plurality of specific examples, the above-mentioned specific examples are not intended to limit one embodiment. The above-described embodiment can be implemented in various other specific examples, and various omissions, replacements, changes, and additions can be made without departing from the gist thereof. For example, in the above-mentioned specific example, the example in which the cell 30 bulges only on one side in the first direction DA is shown, but the present invention is not limited to this, and the cell 30 is, for example, as shown in FIG. It may bulge on both sides in the one-way DA.

DA 1st direction SA1 1 side DB 2nd direction SB1 Other side DC 3rd direction SC1 1 side C Notch V Void 10 Storage element unit 11 Storage box 12 Frame 13 Panel 14 Control module 15 Storage element module combination 15A 1st storage Element module combination 15B Second power storage element module combination 18 Containment body 20 Power storage element module 20A First power storage element module 20B Second power storage element module 21 First end cover 22 Second end cover 25 Heat transfer member 30, 30A to 30P Cell 31E Peripheral part 31C Central part 32 Electrode plate 33 Exterior body 34A First exterior material 34AP Protruding part 34B Second exterior material 35 Tab 35A Base end 35B Tip 38 Joint layer 40 Case 40a Opening 42 Bottom 44 Side wall 44a Main wall 44b Outer wall 45 Notch forming wall 46 Notch guide wall 46a First rib 46b Second rib 48a First recess 48b Second recess 49 Receiving section 49a Hole 51 First protrusion 51a Projection Support portion 51b Guide portion 52 Second protrusion 52a Projection support portion 52b Guide portion 53 Inner rib 56 First engagement portion 57 Second engagement portion 58 Swelling restriction portion 60 Cover 61 Cover body 62 Fixing portion 62a Extension portion 62b Claw 70 Tab block 71 Insulation base 72 Inner 73 Outer 74 Connection guide 75 Connection protrusion 76 Convex 80, 80A, 80B Electrode member 81 Conductive base 82 Connection 83 Connection end 84 Convex

Claims (12)

A plurality of cells stacked in the stacking direction, wherein each cell has a tab on the peripheral edge portion and the thickness of the peripheral edge portion is thinner than the thickness of the central portion surrounded by the peripheral edge portion. When,
An electrode member arranged between the tabs of two cells adjacent to each other in the stacking direction and electrically connected to each other, and electrically connected to the two electrically connected cells.
A case for accommodating the plurality of cells is provided.
The electrode member is provided at a position deviated from the central portion in a direction orthogonal to the laminating direction.
The case holds the electrode member so as to allow the electrode member to move relative to the case in the stacking direction and to regulate the relative movement of the electrode member to the case in a direction orthogonal to the stacking direction. to, power storage element module. A plurality of cells stacked in the stacking direction, wherein each cell has a tab on the peripheral edge portion and the thickness of the peripheral edge portion is thinner than the thickness of the central portion surrounded by the peripheral edge portion. When,
An electrode member arranged between the tabs of two cells adjacent to each other in the stacking direction and electrically connected to each other, and electrically connected to the two electrically connected cells.
A case for accommodating the plurality of cells is provided.
The electrode member is provided at a position deviated from the central portion in a direction orthogonal to the laminating direction.
The case has a bottom portion that supports the plurality of cells from one side in the stacking direction, and a side wall portion that rises from the bottom portion in the stacking direction.
The side wall is provided with a notch through which the tabs of the plurality of cells pass.
The electrode member is a power storage element module supported by the side wall portion. A plurality of cells stacked in the stacking direction, wherein each cell has a tab on the peripheral edge portion and the thickness of the peripheral edge portion is thinner than the thickness of the central portion surrounded by the peripheral edge portion. When,
An electrode member arranged between the tabs of two cells adjacent to each other in the stacking direction and electrically connected to each other, and electrically connected to the two electrically connected cells.
A case for accommodating the plurality of cells is provided.
The electrode member is provided at a position deviated from the central portion in a direction orthogonal to the laminating direction.
The case has a bottom portion that supports the plurality of cells from one side in the stacking direction, and a side wall portion that rises from the bottom portion in the stacking direction.
One of the electrode member and the side wall portion has a recess extending in the stacking direction.
The other of the electrode member and the side wall portion is a power storage element module having a convex portion inserted into the concave portion and movable relative to the concave portion in the stacking direction. The cell has an electrode body including a plurality of electrode plates, an exterior body containing the electrode body, and a tab connected to the electrode body and extending to the outside of the exterior body.
The tab has a base end portion extending from the exterior body and a tip end portion bent with respect to the base end portion.
The power storage element module according to any one of claims 1 to 3, wherein the tip portions of the tabs of the two electrically connected cells are in surface contact with each other on the electrode member. The power storage element module according to claim 4 , wherein the base end portion extends in a direction orthogonal to the stacking direction, and the tip end portion extends in the stacking direction. The tip of the tab located on one side of the two electrically connected cells in the stacking direction extends from the base end of the tab to the other side in the stacking direction and is electrically connected. wherein the tip portion of the tab located on the other side in the stacking direction of the connected two cells are from the base end portion of the tab extending out to one side in the stacking direction to claim 5 The power storage element module according to. The cell has an electrode body including a plurality of electrode plates, an exterior body containing the electrode body, and a tab connected to the electrode body and extending to the outside of the exterior body.
The exterior body includes a first exterior material having a bulging portion forming the central portion, a flat second exterior material forming a space for accommodating the electrode body between the first exterior material, and a flat second exterior material. Have,
The plurality of cells include a cell in which the first exterior material faces one side in the stacking direction and the second exterior material faces the other side in the stacking direction, and the second exterior material faces one side in the stacking direction. Direction The power storage element according to any one of claims 1 to 6, wherein the first exterior material is laminated so that cells facing the other side in the stacking direction are alternately arranged in the stacking direction. module. The power storage element module according to claim 7 , wherein the two electrically connected cells in which the electrode members are arranged are laminated so that the first exterior materials face each other. The thickness of the electrode member along the stacking direction is larger than the protruding length of the bulging portion along the pre-stacking direction and not more than twice the protruding length of the bulging portion along the pre-stacking direction. The power storage element module according to claim 8. A power storage element unit including a plurality of power storage element modules according to any one of claims 1 to 9. A building comprising the power storage element unit according to claim 10. An accommodating body for a power storage element module that accommodates a plurality of cells stacked in the stacking direction.
A case having a bottom portion that supports the plurality of cells from one side in the stacking direction, and a side wall portion that rises from the bottom portion in the stacking direction.
An electrode member supported by the case, which is arranged between the tabs of two cells of the plurality of cells housed in the case, which are adjacent to each other in the stacking direction and electrically connected to each other. The two electrically connected cells and the electrically connected electrode member are provided.
Each cell has the tab on the peripheral edge, the thickness of the peripheral edge is thinner than the thickness of the central portion surrounded by the peripheral edge, and the electrode member is supported by the case. stacking direction ing as similar position deviated from the central portion in a direction perpendicular disposed between the tabs of the two cells that are housed in the case, container for storage element module.