Energy storage element module, energy storage element unit, building, and method for assembling the energy storage element module

Abstract

To achieve stable insulation between tabs of different cells.SOLUTION: A power storage element module 20 includes: a plurality of cells 30 stacked in a first direction DA, each of the cells 30 having a tab 35 protruding in a second direction DB non-parallel to the first direction DA; a case 40 accommodating the plurality of cells 30; a tab block 70 arranged between two tabs 35 in two cells 30 adjacent to each other in the first direction DA, the tab block having insulation properties; and a cover 50 which is attached to the case 40, and comes into contact with the tab block 70 from the outside in the second direction DB to regulate the outward movement of the tab block 70 in the second direction DB.SELECTED DRAWING: Figure 9

Description

【Technical Field】 【0001】 The present disclosure relates to a power storage element module, a power storage element unit, a building, and a method for assembling a power storage element module. 【Background Art】 【0002】 As disclosed in Patent Document 1, a power storage element module including a case that houses a plurality of cells including tabs and a tab block that insulates the tabs of adjacent cells is known. The tab block is attached to the case so as to be positioned between two tabs of two adjacent cells. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2019-67679 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 When a force is applied to the power storage element module, the tab block can move outward from a position between two tabs of two adjacent cells. When the tab block moves outward with respect to the tabs, the tabs of different cells cannot be stably insulated. An object of the present disclosure is to stably insulate the tabs of different cells. 【Means for Solving the Problems】 【0005】 A power storage element module according to an embodiment of the present disclosure includes: a plurality of cells stacked in a first direction, each cell including a tab protruding in a second direction non-parallel to the first direction; a case that houses the plurality of cells; a tab block that is disposed between two tabs of two adjacent cells in the first direction and has insulating properties; The case comprises a cover attached to the case, which contacts the tab block from the outside in the second direction and restricts the outward movement of the tab block in the second direction. [Effects of the Invention] 【0006】 According to this disclosure, tabs of different cells can be reliably isolated from each other. [Brief explanation of the drawing] 【0007】 [Figure 1] Figure 1 is a diagram illustrating one embodiment, and is a perspective view showing an energy storage element unit. [Figure 2] Figure 2 is a perspective view showing the energy storage element module included in the energy storage element unit of Figure 1. [Figure 3] Figure 3 is an exploded perspective view showing an example of a cell unit included in the energy storage element module shown in Figure 2. [Figure 4] Figure 4 is a diagram illustrating the electrical connections of the multiple cells included in the energy storage module shown in Figure 2. [Figure 5] Figure 5 is a perspective view showing a case included in the energy storage element module of Figure 2. [Figure 6] Figure 6 is an enlarged plan view of the third side wall in the case shown in Figure 5. [Figure 7] Figure 7 is a perspective view showing the first cover included in the energy storage element module of Figure 2. [Figure 8] Figure 8 is a schematic diagram showing the main components of the energy storage element module shown in Figure 2. [Figure 9] Figure 9 is a plan view showing the energy storage element module of Figure 2. [Figure 10] Figure 10 is a plan view showing the energy storage element module of Figure 2. [Figure 11] Figure 11 is a perspective view showing the tab block included in the energy storage element module of Figure 2. [Figure 12]FIG. 12 is a perspective view showing an electrode member included in the energy storage element module of FIG. 2. [Figure 13] FIG. 13 is a perspective view showing an electrode member of the energy storage element module of FIG. 3. [Figure 14] FIG. 14 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. [Figure 15] FIG. 15 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. [Figure 16] FIG. 16 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. [Figure 17] FIG. 17 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. [Figure 18] FIG. 18 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. [Figure 19] FIG. 19 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. [Figure 20] FIG. 20 is a diagram for explaining a method of assembling the energy storage element module of FIG. 2. 【DETAILED DESCRIPTION OF THE INVENTION】 【0008】 One embodiment of the present disclosure relates to the following [1] to

[10] . 【0009】 [1] A plurality of cells stacked in a first direction, each cell including a tab protruding in a second direction non-parallel to the first direction; A case for housing the plurality of cells; A tab block disposed between two tabs of two adjacent cells in the first direction and having insulation; A cover attached to the case, contacting the tab block from the outside in the second direction, and restricting outward movement of the tab block in the second direction. An energy storage element module comprising: 【0010】 [2] The case has a bottom wall portion that supports the plurality of cells from the first direction, and a side wall portion that extends from the bottom wall portion in the first direction, The side wall portion contacts the tab block from the inside in the second direction, thereby restricting the inward movement of the tab block in the second direction, in the energy storage element module of [1]. 【0011】 [3] The energy storage element module of [1] or [2], wherein the tab block contacts the cell from the outside in the second direction and restricts the outward movement of the cell in the second direction. 【0012】 [4] Further comprising an electrode member electrically connected to the tab, The tab block contacts the electrode member from the inside in the second direction, thereby restricting the inward movement of the electrode member in the second direction, in any of the energy storage element modules [1] to [3]. 【0013】 [5] Further comprising an electrode member electrically connected to the tab, The tab block contacts the cell from the outside in the second direction, restricting the outward movement of the cell in the second direction. The tab block contacts the electrode member from the inside in the second direction, thereby restricting the inward movement of the electrode member in the second direction. The tab is in surface contact with the electrode member from the outside in the second direction, in the energy storage element module of [1] or [2]. 【0014】 [6] The cover includes a plate-like portion that forms the outer surface of the energy storage element module and a protruding portion that extends from the plate-like portion toward the case, The tab block is one of the energy storage element modules [1] to [5] that contacts the protruding portion. 【0015】 [7] The cover includes a rib protruding from the plate-like portion toward the case, the energy storage element module of [6]. 【0016】 [8] A storage element module of any of [1] to [7], wherein adjacent cells in the first direction are joined to each other by a plurality of bonding members that extend in the second direction and are arranged in a third direction that is non-parallel to both the first and second directions. 【0017】 [9] [1]~[8] one of the energy storage element modules, A storage element unit comprising a housing for housing the aforementioned storage element module. 【0018】 A building equipped with

[10] [9] energy storage element units. 【0019】 Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Note that, for the sake of illustration and ease of understanding, the scale and aspect ratios of the drawings attached to this specification have been appropriately altered and exaggerated from those of the actual objects. Furthermore, some configurations shown in some drawings may be omitted in others. 【0020】 In this specification, terms such as "orthogonal," "identical," and "parallel," as well as lengths, which specify shapes, geometric conditions, and their degrees, shall not be limited to their strict meanings, but shall be interpreted to include a range that can be expected to function similarly. 【0021】 To clarify the directional relationships between drawings, the first direction DA, the second direction DB, and the third direction DC are shown as common directions between drawings. In each direction, the tip of the arrow is the first side. In each direction, the side opposite to the first side is the second side. Arrows pointing towards the viewer along the direction perpendicular to the drawing's plane are indicated by a symbol with a dot inside a circle, as shown in Figure 4, for example. Arrows pointing towards the back of the drawing along the direction perpendicular to the drawing's plane are indicated by a symbol with an "x" inside a circle, as shown in Figure 8, for example. 【0022】 In this specification, if multiple upper limit candidates and multiple lower limit candidates are given for a certain parameter, the numerical range of that parameter may be constructed by combining any one upper limit candidate and any one lower limit candidate. As an example, consider the statement, "Parameter B may be A1 or greater, A2 or greater, A3 or greater. Parameter B may be A4 or less, A5 or less, A6 or less." In this example, the numerical range of parameter B may be A1 or greater and A4 or less, A1 or greater and A5 or less, A1 or greater and A6 or less, A2 or greater and A4 or less, A2 or greater and A5 or less, A2 or greater and A6 or less, A3 or greater and A4 or less, A3 or greater and A5 or less, and A3 or greater and A6 or less. 【0023】 Figures 1 to 20 are diagrams illustrating one embodiment of the present invention. Figure 1 is a perspective view showing a power storage element unit 10 according to one embodiment. The power storage element unit 10 includes a housing 15 and a plurality of power storage element modules 20 housed in the housing 15. The power storage element unit 10 is used as a rechargeable secondary battery. The power storage element unit 10 may be installed in a building. The power storage element unit 10 may function as a power source for electrical devices (not shown) installed in the building by being electrically connected to the building's wiring. 【0024】 In the example shown in Figure 1, the housing 15 has a rectangular parallelepiped external shape with one side open. The housing 15 includes a housing body 16 and a housing cover 17 that covers the housing body 16 from above. The housing body 16 and the housing cover 17 form the housing space 15S of the housing 15. In the illustrated example, the energy storage element module 20 is housed in the housing space 15S of the housing 15. 【0025】 The housing 15 may house equipment other than the energy storage element module 20. In the example shown in Figure 1, the energy storage element unit 10 includes a control module 12 electrically connected to the energy storage element module 20. The control module 12 has one or more functions: a function to control the storage and discharge of the multiple energy storage element modules 20, a function to monitor the storage state (e.g., amount of stored energy) of the energy storage element modules 20, and a function to monitor whether or not there is an abnormality in the energy storage element modules 20. The control module 12 can transmit information regarding the storage state and abnormality of the energy storage element modules 20 to a control device (not shown) located outside the energy storage element unit 10. The control module 12 may include a switch that can change the electrical connection state with the energy storage element modules 20 and the electrical connection state with the control device. 【0026】 In the example shown in Figure 1, the energy storage element module 20 housed in the housing space 15S of the housing 15 is partially observed. Multiple energy storage element modules 20 may be housed in the housing space 15S of the housing 15. In the illustrated example, the energy storage element modules 20 are stacked in the first direction DA within the housing space 15S of the housing 15. The energy storage element modules 20 housed in the housing space 15S of the housing 15 are supported by the housing body 16 from the second side in the first direction DA. The energy storage element modules 20 housed in the housing space 15S of the housing 15 are restricted from moving in a direction perpendicular to the first direction DA. 【0027】 In the example shown in Figure 2, the energy storage module 20 has a rectangular parallelepiped shape. The energy storage module 20 includes a plurality of cells 30 stacked in a first direction DA, a case 40 housing the plurality of cells 30, and a cover 50 attached to the case 40 from the outward side in a second direction DB, i.e., the side away from the center of the energy storage module 20 in the second direction DB. Each cell 30 includes a tab 35 projecting in a second direction DB that is non-parallel to the first direction DA. The energy storage module 20 includes a tab block 70 positioned between two tabs 35 in two adjacent cells 30 in the first direction DA. The energy storage module 20 may also include electrode members 80 electrically connected to the tabs 35. In the illustrated example, the second direction DB is the direction perpendicular to the first direction DA. 【0028】 In the example shown in Figure 2, the case 40 opens to the first side SA1 in the first direction DA. The opening of the case 40 is covered by the lid 60 from the first side SA1 in the first direction DA. The case 40 and the lid 60 may constitute a housing 18 that houses the cell 30. 【0029】 In the example shown in Figure 2, case 40 is covered from the first side SB1 in the second direction DB by a first cover 50a, which is a cover 50. Case 40 is covered from the second side in the second direction DB by a second cover 50b, which is a cover 50. The first cover 50a and the second cover 50b may have the same configuration as each other. The first cover 50a and the second cover 50b may have different configurations as each other. 【0030】 Figure 3 illustrates two cells 30 housed in case 40, adjacent to each other in the first direction DA. In the example shown in Figure 3, cell 30 is a plate-like member extending in the second direction DB and in a third direction DC that is non-parallel to both the first direction DA and the second direction DB. In the illustrated example, the third direction DC is perpendicular to both the first direction DA and the second direction DB. 【0031】 Cell 30 is the smallest unit treated as an energy storage element. Various types of cells can be used for cell 30. For example, cell 30 may be a lithium-ion battery. Cell 30 has a longitudinal direction parallel to the second direction DB. Cell 30 has a width direction parallel to the third direction DC. Cell 30 has a first surface 30a and a second surface 30b opposite to the first surface 30a. In the illustrated example, the two cells 30 face the first direction DA on their second surface 30b. The second surface 30b may be flat. 【0032】 As shown in Figure 3, cell 30 has a central portion 30c located in the center and a peripheral portion 30e surrounding the central portion 30c. The central portion 30c protrudes from the peripheral portion 30e to one side in the first direction DA. In the illustrated example, in cell 30 located on the first side SA1 in the first direction DA, the central portion 30c protrudes from the peripheral portion 30e to the first side SA1 in the first direction DA. In cell 30 located on the second side in the first direction DA, the central portion 30c protrudes from the peripheral portion 30e to the second side in the first direction DA. 【0033】 In the example shown in Figure 3, the central portion 30c forms a plurality of protruding surfaces 31 on the first surface 30a of the cell 30, oriented in a direction perpendicular to the first direction DA. The protruding surfaces 31 include a pair of first protruding surfaces 31a oriented in the longitudinal direction (second direction DB) and a pair of second protruding surfaces 31b oriented in the width direction (third direction DC). Each first protruding surface 31a extends in the first direction D1 along the width direction. Each second protruding surface 31b extends in the first direction D1 along the longitudinal direction. 【0034】 As shown in Figures 4 and 8, the pair of first protruding surfaces 31a may be inclined somewhat inward in the longitudinal direction (second direction DB), that is, toward the center of the cell 30 in the longitudinal direction, from the connection point between the central portion 30c and the peripheral portion 30e. The pair of second protruding surfaces 31b may be inclined somewhat inward in the width direction (third direction DC), that is, toward the center of the cell 30 in the width direction, from the connection point between the central portion 30c and the peripheral portion 30e. 【0035】 In the example shown in Figure 3, the cell 30 includes a plurality of electrode plates 32, including a positive electrode plate and a negative electrode plate; an outer casing 33 that houses the plurality of electrode plates 32; and tabs 35 that are electrically connected to the electrode plates 32 and extend outward from the outer casing 33. 【0036】 The outer casing 33 may include an insulating layer. The electrode plate 32 may be insulated from the outside by housing it in the outer casing 33 which includes an insulating layer. 【0037】 In the example shown in Figure 3, the outer casing 33 has a first outer casing 33a and a second outer casing 33b facing each other in the first direction DA. The first outer casing 33a constitutes the first surface 30a of the cell 30. The first outer casing 33a has a bulge 33ap that protrudes in the first direction DA. The bulge 33ap constitutes the central part 30c of the cell 30. The second outer casing 33b constitutes the second surface 30b of the cell 30. The first outer casing 33a and the second outer casing 33b form a space inside the first outer casing 33a for housing the electrode plate 32. The first outer casing 33a and the second outer casing 33b are connected to each other at their circumferential edges. 【0038】 In the example shown in Figure 3, the cell 30 has a pair of tabs 35. The pair of tabs 35 protrude from the outer casing 33 in the central portion of the cell 30 in the width direction (third direction DC) on one side of the cell 30 in the longitudinal direction (second direction DB). More specifically, the tabs 35 pass between the first outer casing 33a and the second outer casing 33b and extend to the outside of the outer casing 33. 【0039】 As shown in Figure 4, one of the pair of tabs 35 may function as the positive terminal of the cell 30. The other of the pair of tabs 35 may function as the negative terminal of the cell 30. In Figure 4, the tab 35 that functions as the positive terminal of the cell 30 is indicated by the letter "(+)" near it. The tab 35 that functions as the negative terminal of the cell 30 is indicated by the letter "(-)" near it. 【0040】 In the example shown in Figure 3, the tab 35 has a base portion 35A extending from the outer casing 33 in the second direction DB, and a tip portion 35B that is bent relative to the base portion 35A to one side in the first direction DA. In other words, the tab 35 is bent at the tip portion 35B to one side in the first direction DA. In the tab 35 located on the first side SB1 in the second direction DB, the tip portion 35B is bent relative to the base portion 35A to the first side SA1 in the first direction DA. In the tab 35 located on the second side in the second direction DB, the tip portion 35B is bent relative to the base portion 35A to the second side in the first direction DA. The tab 35 may also be bent in the first direction DA when two adjacent cells 30 are stacked on top of each other in the first direction DA, i.e., when a cell unit 36 ​​is formed. 【0041】 In the examples shown in Figures 3 and 4, two adjacent cells 30 in the first direction DA are superimposed on each other in the first direction DA from the second surface 30b. A cell unit 36 ​​may be formed by superimposing two adjacent cells 30 in the first direction DA. The cell unit 36 ​​has a first surface 36a and a second surface 36b opposite to the first surface 36a. The first surface 36a of the cell unit 36 ​​is formed by the first surface 30a of the cell 30 located on the first side SA1 in the first direction DA. The second surface 36b of the cell unit 36 ​​is formed by the first surface 30a of the cell 30 located on the second side in the first direction DA. The cell unit 36 ​​has a longitudinal direction in the same direction as the longitudinal direction of the cell 30. The cell unit 36 ​​has a width direction in the same direction as the width direction of the cell 30. 【0042】 In the cell unit 36 ​​shown in Figure 4, the central portion 30c of each cell 30 protrudes outward in the first direction DA, that is, away from the joint portion with other cells 30. As a result, the cell unit 36 ​​has a shape that protrudes on both sides in the first direction DA. 【0043】 In the example shown in Figure 4, the cell unit 36 ​​includes a pair of tabs 35 adjacent to each other in the first direction DA. A tab unit 37 may be formed by two tabs 35 adjacent to each other in the first direction DA. That is, the cell unit 36 ​​may include a pair of tab units 37. The base end 37A of the tab unit 37 may be formed by the overlapping of the two base ends 35A of the two tabs. The tip end 37B of the tab unit 37 may be formed by the overlapping of the two tip ends 35B of the two tabs. 【0044】 The two cells 30 constituting the cell unit 36 ​​may be electrically connected to each other at the two tabs 35 constituting the tab unit 37. In the examples shown in Figures 4 and 8, the two cells 30 are electrically connected to each other at the two tabs 35 constituting one tab unit 37 and the two tabs 35 constituting the other tab unit 37. That is, in the illustrated examples, the two cells 30 are electrically connected to each other at two locations: a portion that functions as a positive terminal and a portion that functions as a negative terminal. As a result, the two cells 30 are electrically connected to each other by parallel connection. 【0045】 As shown in Figure 4, by electrically connecting the tabs 35 that form the positive terminals to each other, one of the pair of tab units 37 may function as the positive terminal of the cell unit 36. By electrically connecting the tabs 35 that form the negative terminals to each other, the other of the pair of tab units 37 may function as the negative terminal of the cell unit 36. In Figure 4, the tab unit 37 that functions as the positive terminal of the cell unit 36 ​​is indicated by the letter "(+)" near that tab unit 37. The tab unit 37 that functions as the negative terminal of the cell unit 36 ​​is indicated by the letter "(-)" near that tab unit 37. 【0046】 As shown in Figures 4 and 8, multiple cell units 36 may be stacked in the first direction DA. In the illustrated example, the eighth cell unit 368, the seventh cell unit 367, the sixth cell unit 366, the fifth cell unit 365, the fourth cell unit 364, the third cell unit 363, the second cell unit 362, and the first cell unit 361 are stacked in this order from the second side toward the first side SA1 in the first direction DA. Two cell units 36 adjacent to each other in the first direction DA overlap each other in the second direction DB at the two bent ends 37B of the two tab units 37. As a result, as shown in Figure 8, in the two cell units 36 stacked in the first direction DA, the four ends 35B of the four tabs 35 overlap each other in the second direction DB. 【0047】 Two adjacent cells 30 in the first direction DA may be welded together at the point where the tabs 35 of each cell 30 are in surface contact with each other. Two adjacent cells 30 in the first direction DA may also be welded together at the point where the bent tabs 35 of each cell 30 are in surface contact with each other in the second direction DB, i.e., where the two tip portions 35B are in surface contact with the second direction DB. Two cells 30 constituting a cell unit 36 ​​may be welded together at the two tabs 35 constituting one tab unit 37 and the two tabs 35 constituting the other tab unit 37. That is, two cells 30 may be welded at two points: the portion that functions as a positive terminal and the portion that functions as a negative terminal. Welding allows for an electrically stable connection at the two tabs 35. 【0048】 In the example shown in Figure 8, two adjacent cells 30 in the first direction DA include tabs 35 that are welded to the electrode member 80 from the outside in the second direction DB, making surface contact. In the eighth cell unit 368, one of the cell units 36 shown in Figure 8, the tab 35 of the cell 30 located on the first side SA1 in the first direction DA is welded at its tip 35B to the electrode member 80 from the outside in the second direction DB, making surface contact. In the cell units other than the eighth cell unit 368, one of the cell units 36 shown in Figure 8, the tab 35 of the cell 30 located on the second side in the first direction DA is welded at its tip 35B to the electrode member 80 from the outside in the second direction DB, making surface contact. The electrode member 80 will be described later. 【0049】 In the example shown in Figure 8, two cell units 36 adjacent to each other in the first direction DA are welded to each other at the point where the tab units 37 of each cell unit 36 ​​are in surface contact with each other. Two cell units 36 adjacent to each other in the first direction DA are welded to each other at the point where the bent tab units 37 of each cell unit 36 ​​are in surface contact with each other in the second direction DB, that is, at the point where the two tip portions 37B are in surface contact with each other in the second direction DB. Two cell units 36 adjacent to each other in the first direction DA are welded to each other in surface contact with the second direction DB at the two tip portions 37B located at either end of the second direction DB. 【0050】 A cell unit assembly 39 may be formed by a plurality of cell units 36 that are electrically connected to each other. In the example shown in Figure 4, the positive terminal of the cell unit assembly 39 is formed by the positive terminal of the first cell unit 361 located on the first side S1 in the first direction DA. The negative terminal of the cell unit assembly 39 is formed by the negative terminal of the eighth cell unit 368 located on the second side in the first direction DA. 【0051】 In the example of the cell unit combination 39 shown in Figure 4, the negative terminal of the first cell unit 361 and the positive terminal of the second cell unit 362 are electrically connected to each other. The negative terminal of the second cell unit 362 and the positive terminal of the third cell unit 363 are electrically connected to each other. The negative terminal of the third cell unit 363 and the positive terminal of the fourth cell unit 364 are electrically connected to each other. The negative terminal of the fourth cell unit 364 and the positive terminal of the fifth cell unit 365 are electrically connected to each other. The negative terminal of the fifth cell unit 365 and the positive terminal of the sixth cell unit 366 are electrically connected to each other. The negative terminal of the sixth cell unit 366 and the positive terminal of the seventh cell unit 367 are electrically connected to each other. The negative terminal of the seventh cell unit 367 and the positive terminal of the eighth cell unit 368 are electrically connected to each other. 【0052】 In the examples shown in Figures 3 and 4, two adjacent cells 30 in the first direction DA are joined by a plurality of connecting members 38 extending in the second direction DB. In the example shown in Figure 3, the plurality of connecting members 38 are provided on the second surface 30b of the cell 30 located on the second side in the first direction DA. Each of the plurality of connecting members 38 has a longitudinal direction parallel to the second direction DB. Each of the plurality of connecting members 38 has a width direction parallel to the third direction DC. In the illustrated examples, the longitudinal direction of the connecting member 38 is parallel to the longitudinal direction of the cell 30. The width direction of the connecting member 38 is parallel to the width direction of the cell 30. 【0053】 By joining two adjacent cells 30 in the first direction DA with a bonding material 38, relative movement of the cells 30 in the longitudinal and width directions within the cell unit 36 ​​can be suppressed. The bonding material 38 may be, for example, double-sided tape. 【0054】 As shown in Figures 3 and 8, the joining material 38 may also be used to join adjacent cell units 36 in the first direction DA. In the example shown in Figure 3, multiple joining materials 38 are provided on the first surface 30a of the cell 30 located on the first side SA1 in the first direction DA. Multiple joining materials 38 are provided on the central portion 30c. These joining materials 38 are used to join other cell units 36 adjacent to the first side SA1 in the first direction DA. By joining adjacent cell units 36 in the first direction DA with the joining material 38, relative movement of the cell units 36 in the longitudinal and width directions within the case 40 can be suppressed. 【0055】 From the viewpoint of stably suppressing the relative movement of two adjacent cells 30 in the first direction DA, and the relative movement of two adjacent cell units 36 in the first direction DA, the ratio of the area of ​​the bonding material 38 to the area of ​​the cell 30 in a plan view (observation from either side in the first direction DA in Figure 3) may be 20% or more, or 30% or more. The ratio of the area of ​​the bonding material 38 to the area of ​​the cell 30 in a plan view may be 50% or less, or 40% or less. 【0056】 From the viewpoint of easily positioning the bonding material 38 on the cell 30, the width of the bonding material 38 (length in the third direction DC in Figure 3) may be 50% or less of the width of the cell 30, or 20% or less. 【0057】 As shown in Figure 3, multiple connecting members 38 extending in the longitudinal direction of the cell 30 may be arranged in the width direction. In the illustrated example, three connecting members 38 extending in the second direction DB are arranged at intervals in the third direction DC. According to this specific example, connecting members 38 can be easily provided on the cell 30 while effectively suppressing relative movement between the cells 30. 【0058】 In the example shown in Figure 3, the joining material 38 that joins two adjacent cells 30 in the first direction DA has the same dimensions as the joining material 38 that joins two adjacent cell units 36 in the first direction DA. That is, the lengths (in the second direction DB) of the multiple joining materials 38 shown are the same. Also, the widths (in the third direction DC) of the multiple joining materials 38 shown are the same. According to this specific example, joining materials 38 having the same dimensions can be used not only to join cells 30 together, but also to join cell units 36 together. This allows for efficient use of the joining materials 38. 【0059】 Next, case 40 will be described, mainly with reference to Figures 5 and 6. Case 40 accommodates a plurality of cells 30. Case 40 may also accommodate a plurality of cell units 36. In the illustrated example, case 40 has a bottom wall portion 42 that supports the plurality of cells 30 from the second side in the first direction DA, and a side wall portion 44 that extends from the bottom wall portion 42 in the first direction DA. Case 40 has an opening 40a at a position facing the bottom wall portion 42 and the first direction DA. 【0060】 As shown in Figures 5 and 6, the bottom wall portion 42 may include receiving holes 43 that penetrate in the first direction DA at the outer end in the second direction DB, i.e., the end on the side away from the center of the energy storage element module 20 in the second direction DB. Four receiving holes 43 are provided along the third direction DC. The positions of the receiving holes 43 correspond to the positions of the fixing portions 54 of the cover 50, which will be described later. The receiving holes 43 are capable of engaging with the fixing portions 54 of the cover 50. 【0061】 The side wall portion 44 surrounds a plurality of cells 30 from a direction nonparallel to the first direction DA. In the example shown in Figure 5, the side wall portion 44 includes a pair of first side wall portions 44a and second side wall portions 44b extending in the first direction DA along the second direction DB, and a pair of third side wall portions 44c and fourth side wall portions 44d extending in the first direction DA along the third direction DC. The first side wall portions 44a and second side wall portions 44b face each other in the third direction DC. The first side wall portion 44a is located at the first side SC1 in the third direction DC more than the second side wall portion 44b. The third side wall portion 44c and fourth side wall portions 44d face each other in the second direction DB. The third side wall portion 44c is located at the first side SB1 in the second direction DB more than the fourth side wall portion. 【0062】 The first side wall portion 44a and the second side wall portion 44b restrict the relative movement of the multiple cells 30 relative to the case 40 in the third direction DC. The third side wall portion 44c and the fourth side wall portion 44d restrict the relative movement of the multiple cells 30 relative to the case 40 in the second direction DB. 【0063】 In the example shown in Figure 5, the first side wall 44a and the second side wall 44b each have a plurality of fixing portions 47 extending from both ends of the first side SB1 and the second side end in the second direction DB. The fixing portions 47 are positioned along the first direction DA, facing the cover 50. The fixing portions 47 are engageable with receiving holes 53 provided in the first cover 50a. The fixing portions 47 are engageable with receiving holes 53 provided in the second cover 50b. In the illustrated example, two fixing portions 47 are provided at both ends of the first side wall 44a in the second direction DB, spaced apart from each other. Two fixing portions 47 are provided at both ends of the second side wall 44b in the second direction DB, spaced apart from each other. Therefore, as shown in Figure 5, there are four fixing portions 47 at either end of the case in the second direction DB. 【0064】 The fixing portion 47 provided on the first side wall portion 44a may be integrally molded with the first side wall portion 44a, for example, as a resin molded product. The fixing portion 47 provided on the second side wall portion 44b may be integrally molded with the second side wall portion 44b, for example, as a resin molded product. 【0065】 In the example shown in Figure 5, the fixing portion 47 is formed as a plate-shaped member having a long side along the first direction DA and a short side along the second direction DB. As a result, the fixing portion 47 is prone to bending deformation on either side in the third direction DC, with respect to the axis along the first direction DA. 【0066】 In the example shown in Figure 2, the first side wall portion 44a and the second side wall portion 44b have a plurality of receiving holes 49 that open to the first side SA1 in the first direction DA. The plurality of receiving holes 49 are provided at intervals in the second direction DB. The plurality of receiving holes 49 also open outward in the third direction DC. The positions where the receiving holes 49 are provided correspond to the positions of the fixing portion 62 of the lid portion 60, which will be described later. In the illustrated example, the receiving holes 49 can engage with the fixing portion 62 of the lid portion 60. The lid portion 60 may be attached to the case 40 by the fixing portion 62 engaging with the receiving holes 49. 【0067】 In the example shown in Figure 5, the third side wall portion 44c and the fourth side wall portion 44d have notches C formed in the central part in the third direction DC. When multiple cells 30 are housed in the case 40, the tabs 35 of the multiple cells 30 are positioned in the notches C, as shown in Figure 9. 【0068】 In the examples shown in Figures 6 and 9, the third side wall portion 44c includes a pair of notched wall portions 45 extending in the third direction DC. The pair of notched wall portions 45 mainly extend in the first direction DA along the third direction DC. The pair of notched wall portions 45 have an inner surface 45a facing inward in the second direction DB and an outer surface 45b facing outward in the second direction DB. The pair of notched wall portions 45 are spaced apart in the third direction DC. The pair of notched wall portions 45 have a shape that is symmetrical with respect to the center line MC of the case 40 in the third direction DC. Each notched wall portion 45 is connected to the first side wall portion 44a or the second side wall portion 44b at its outer end in the third direction DC, i.e., the end of the case 40 away from the center in the third direction DC. 【0069】 As shown in Figure 9, the notched wall portion 45 may be recessed inward in the second direction DB at its central portion in the third direction DC. In the illustrated example, the outer surface 45b of the notched wall portion 45 is located inward in the second direction DB at its central portion in the third direction DC compared to portions other than the central portion in the third direction DC. The notched wall portion 45 faces the tab block 70 and electrode member 80, described later, from the inside of the second direction DB at its inwardly recessed portion in the second direction DB. The notched wall portion 45 faces the plurality of cells 30 from the outside of the second direction DB at its inwardly recessed portion in the second direction DB. The notched wall portion 45 may be in contact with the plurality of cells 30 at its inwardly recessed portion in the second direction DB. 【0070】 In the example shown in Figure 9, the notched wall portion 45 has a plurality of ribs 45r in the outer portion in the third direction DC. The plurality of ribs 45r are spaced apart in the third direction DC. Each rib 45r protrudes inward from the inner surface 45a of the notched wall portion 45 in the second direction DB. Each rib 45r extends along the second direction DB in the first direction DA. According to this specific example, the rigidity of the notched wall portion 45 can be strengthened. 【0071】 In the examples shown in Figures 6 and 9, the third side wall 44c includes a pair of notched guide walls 46 connected to the inner ends of a pair of notched wall portions 45 in the third direction DC, i.e., the ends of the case 40 that are closer to the center in the third direction DC. Each notched guide wall 46 extends outward in the second direction DB, i.e., away from the center of the case 40 in the second direction DB, from the portion connected to the notched wall portion 45. Each notched guide wall 46 extends in the first direction DA along the second direction DB. The pair of notched guide walls 46 are spaced apart in the third direction DC. The pair of notched guide walls 46 have a shape that is symmetrical with respect to the center line MC of the case 40 in the third direction DC. 【0072】 In the example shown in Figure 6, each notched guide wall portion 46 has an end face 46s facing outward in the second direction DB at its outer end in the second direction DB. The end face 46s extends in the first direction DA along the third direction DC. As will be described in detail later, the conductive base portion 82 of the electrode member 80 may contact the end face 46s from the outside in the second direction DB. The outer portion 73 of the tab block 70 may also contact the end face 46s from the outside in the second direction DB. 【0073】 In the example shown in Figure 6, each notched guide wall 46 has a first rib 46a and a second rib 46b aligned in the second direction DB. The first rib 46a and the second rib 46b are provided on the outer surface of the corresponding notched guide wall 46 in the third direction DC. The first rib 46a and the second rib 46b project outward from the corresponding notched guide wall 46 in the third direction DC. The first rib 46a and the second rib 46b extend along the third direction DC in the first direction DA. The first rib 46a and the second rib 46b extend along the entire length of the notched guide wall 46 in the first direction DA. 【0074】 The first rib 46a has an inner surface 46aa facing inward in the second direction DB, and an outer surface 46ab facing outward in the second direction DB. The inner surface 46aa and the outer surface 46ab extend in the first direction DA along the third direction DC. The outer surface 46ab and the end surface 46s are separated from each other with a gap D3 in the second direction DB. 【0075】 The second rib 46b has an inner surface 46ba facing inward in the second direction DB and an outer surface 46bb facing outward in the second direction DB. The inner surface 46ba and the outer surface 46bb extend in the first direction DA along the third direction DC. In the illustrated notched guide wall 46, the inner surface 46ba and the end surface 46s are separated from each other with a gap D4 in the second direction DB. 【0076】 In the example shown in Figure 6, the second rib 46b is located further outward in the second direction DB than the first rib 46a. That is, the first rib 46a is located between the notched wall 45 and the second rib 46b in the second direction DB. The inner surface 46aa of the first rib 46a faces the notched wall 45 and the second direction DB. The outer surface 46ab of the first rib 46a faces the inner surface 46ba of the second rib 46b and the second direction DB. 【0077】 In the examples shown in Figures 6 and 9, the first rib 46a forms a first recess 48a between itself and the notched wall portion 45. The first recess 48a extends in the first direction DA. The first recess 48a is partitioned from the inside in the second direction DB by the notched wall portion 45. The first recess 48a is partitioned from the outside in the second direction DB by the inner surface 46aa of the first rib 46a. The notched wall portion 45 that partitions the first recess 48a from the inside in the second direction DB and the end face 46s are separated from each other with a gap D1 in the second direction DB. The inner surface 46aa of the first rib 46a and the end face 46s are separated from each other with a gap D2 in the second direction DB. The first recess 48a is partitioned from the inside in the third direction DC by the surface of the notched guide wall portion 46 that faces outward in the third direction DC. 【0078】 A connecting projection 75, provided on the tab block 70 (described later), may be inserted into the first recess 48a from the first side SA1 in the first direction DA. By inserting the connecting projection 75 into the first recess 48a in this manner, the relative movement of the tab block 70 with respect to the case 40 in a direction perpendicular to the first direction DA may be restricted. 【0079】 A protrusion 84 provided on the connection portion 81 of the electrode member 80, which will be described later, may be inserted into the first recess 48a. By inserting the protrusion 84 into the first recess 48a in this manner, the relative movement of the electrode member 80 with respect to the case 40 in a direction perpendicular to the first direction DA may be restricted. 【0080】 In the example shown in Figure 6, the first rib 46a and the second rib 46b form a second recess 48b between them. The second recess 48b extends in the first direction DA. The second recess 48b is partitioned from the inside in the second direction DB by the outer surface 46ab of the first rib 46a. The second recess 48b is partitioned from the outside in the second direction DB by the inner surface 46ba of the second rib 46b. The outer surface 46ab of the first rib 46a and the end face 46s are separated from each other with a gap D3 in the second direction DB. The inner surface 46ba of the second rib 46b and the end face 46s are separated from each other with a gap D4 in the second direction DB. 【0081】 A connecting projection 75 provided on the tab block 70, which will be described later, may be inserted into the second recess 48b from the first side SA1 in the first direction DA. By inserting the projection 76 into the second recess 48b in this manner, the relative movement of the tab block 70 with respect to the case 40 in a direction perpendicular to the first direction DA may be restricted. 【0082】 A protrusion 84 provided on the connection portion 81 of the electrode member 80, which will be described later, may be inserted into the second recess 48b. By inserting the protrusion 84 into the second recess 48b in this manner, the relative movement of the electrode member 80 with respect to the case 40 in a direction perpendicular to the first direction DA may be restricted. 【0083】 The above explanation regarding the configuration of the third side wall portion 44c also applies to the configuration of the fourth side wall portion 44d. 【0084】 In the example shown in Figure 2, the cover 50 includes a first cover 50a attached to the case 40 from the first side in the second direction DB, and a second cover 50b attached to the case 40 from the second side in the second direction DB. The first cover 50a and the second cover 50b may have the same shape as each other. The first cover 50a and the second cover 50b may have different shapes as well. The first cover 50a will be described below, mainly with reference to Figure 7. 【0085】 In the example shown in Figure 7, the first cover 50a includes a plate-like portion 51 that forms the outer surface of the energy storage element module 20, and a projection 52 that protrudes inward from the plate-like portion 51 in the second direction DB. The plate-like portion 51 extends mainly in the first direction DA and the third direction DC. In the first cover 50a, the projection 52 protrudes from the plate-like portion 51 towards the second side in the second direction DB. 【0086】 In the example shown in Figure 8, the protruding portion 52 contacts the outer portion 73 of the tab block 70, which will be described later, from the outside in the second direction DB. That is, the cover 50 contacts the tab block 70 from the outside in the second direction DB. As will be described in detail later, the cover 50, which contacts the tab block 70 from the outside in the second direction DB, can suppress the outward movement of the tab block 70 in the second direction DB. 【0087】 In the example shown in Figure 7, the plate-like portion 51 is bent inward in the second direction DB at its end in the third direction DC, with respect to an axis along the first direction DA. The portion of the plate-like portion 51 bent inward in the second direction DB is provided with a number of receiving holes 53 that penetrate the third direction DC. The receiving holes 53 have a certain length along the first direction DA. The positions of the receiving holes 53 correspond to the positions of the fixing portions 47 provided on the first side wall portion 44a and the second side wall portion 44b. The receiving holes 53 are capable of engaging with the fixing portions 47 provided on the first side wall portion 44a and the second side wall portion 44b. 【0088】 In the example shown in Figure 7, the first cover 50a may include a fixing portion 54 projecting inward in the second direction DB at its second end in the first direction DA. Four fixing portions 54 are provided along the third direction DC, facing the case 40. The fixing portions 54 are curved towards the second side in the first direction DA about an axis extending in the third direction DC. The fixing portions 54 are capable of engaging with receiving holes 43 provided in the bottom wall portion 42 of the case 40. The engagement of the fixing portions 54 with the receiving holes 43 suppresses outward movement of the cover 50 relative to the case 40 in the second direction DB. 【0089】 As shown in Figure 7, the cover 50 may include ribs 55 projecting inward in the second direction DB from the plate-like portion 51 toward the case 40. The cover 50 may include a plurality of ribs 55. The cover 50 may include a plurality of ribs 55 extending in the first direction DA. The cover 50 may include a plurality of ribs 55 extending in the third direction DC. The cover 50 may include a plurality of ribs extending in the second direction DB. The ribs 55 extending in the first direction DA can strengthen the rigidity of the cover 50 against forces applied from the first direction DA. The ribs 55 extending in the second direction DB can strengthen the rigidity of the cover 50 against forces applied from the second direction DB. The ribs 55 extending in the first direction DA can strengthen the rigidity of the cover 50 against forces applied from the third direction DC. 【0090】 In the example shown in Figure 2, the lid 60 is located on the first side SA1 in the first direction DA relative to the case 40. The lid 60 covers the opening 40a of the case 40 from the first side SA1 in the first direction DA. The lid 60 protects the multiple cells 30 from the first side in the first direction DA. The lid 60 restricts the movement of the multiple cells 30 to the first side SA1 in the first direction DA. 【0091】 In the example shown in Figure 2, the lid portion 60 has a lid body 61 and a plurality of fixing portions 62 extending from the lid body 61. The lid body 61 extends in a second direction DB and a third direction DC. The plurality of fixing portions 62 are provided on the edge of the lid body 61 in the third direction DC. Multiple fixing portions 62 are provided at intervals in the second direction DB. The positions where the fixing portions 62 are provided correspond to the positions of the receiving holes 49 provided in the first side wall portion 44a and the second side wall portion 44b. In the illustrated example, the fixing portions 62 are capable of engaging with the receiving holes 49. 【0092】 Next, the tab block 70 and electrode member 80 will be described mainly with reference to Figures 8 to 12. Here, Figure 9 shows the energy storage element module 20, schematically shown in Figure 8, with the lid 60 and the first cell unit 361 removed. Figure 10 shows the state shown in Figure 9 with the tab block 70 and electrode member 80, which are positioned between the first cell unit 361 and the second cell unit 362, further removed. In the example shown in Figures 9 and 10, the second cell unit 362 is observed as the cell unit 36 ​​housed in the case 40. 【0093】 The tab block 70 is positioned between the tabs 35 of two adjacent cells 30 in the first direction DA. The tab block 70 is insulating. The tab block 70 insulates between the tabs 35 of two adjacent cells 30 in the first direction DA. As shown in Figure 8, the tab block 70 may be positioned between two adjacent cell units 36 in the first direction DA. By positioning the tab block 70 between two adjacent cell units 36 in the first direction DA, the tabs 35 of different cell units 36 can be insulated by the tab block 70. The tab block 70 may be a molded resin product. 【0094】 In the example shown in Figure 8, the tab blocks 70 are attached to the case 40. The tab blocks 70 are positioned in notches C provided in the third side wall 44c or in notches C provided in the fourth side wall 44d. The tab blocks 70 positioned in the notches C of the third side wall 44c are located between the first cell unit 361 and the second cell unit 362, between the third cell unit 363 and the fourth cell unit 364, between the fifth cell unit 365 and the sixth cell unit 366, and between the seventh cell unit 367 and the eighth cell unit 368. The tab blocks 70 positioned in the notches C of the fourth side wall 44d are located between the second cell unit 362 and the third cell unit 363, between the fourth cell unit 364 and the fifth cell unit 365, and between the sixth cell unit 366 and the seventh cell unit 367. In the illustrated example, the tab block 70 has a shape that is symmetrical with respect to the center line MC in the third direction DC of the case 40. 【0095】 In the examples shown in Figures 9 and 10, the tab block 70 attached to the case 40 has a first surface 70a facing one side in the first direction DA, and a second surface 70b opposite to the first surface 70a. In the example shown in Figure 9, the first surface 70a of the tab block 70 is observed from the first side SA1 in the first direction DA. In the example shown in Figure 10, the second surface 70b of the tab block 70 is observed from the first side SA1 in the first direction DA. That is, in the example shown in Figure 10, the tab block 70 is attached to the case 40 facing the opposite direction to that in the example shown in Figure 9. 【0096】 In the examples shown in Figures 9 and 10, the tab block 70 has an insulating base portion 71 positioned in the notch C, an inner portion 72 and an outer portion 73 connected to the insulating base portion 71, and a projection 74 connected to the outer portion 73. The insulating base portion 71 is located in the notch C provided in the third side wall portion 44c or the notch C provided in the fourth side wall portion 44d. The insulating base portion 71 includes a portion facing the tab 35 of the cell 30 housed in the case 40 in the first direction DA. The insulating base portion 71 extends outward from the notch C in the second direction DB. The insulating base portion 71 is located between a pair of notch guide walls 46 in the third direction DC. The contact of the insulating base portion 71 with the inner surface of the notch guide wall 46 in the third direction DC restricts the relative movement of the tab block 70 in the third direction DC relative to the case 40. 【0097】 In the examples shown in Figures 9 and 11, the inner portion 72 is connected to the insulating base portion 71. The periphery of the inner portion 72 is provided with a rib 72r rising from the first surface 70a. In a tab block 70 attached to a case 40, the inner portion 72 is connected to the insulating base portion 71 from the inside in the second direction DB. As shown in Figure 9, the inner portion 72 is located within the space for housing the cell 30 surrounded by the case 40. When the tab block 70 is positioned between two adjacent cells 30 in the first direction DA, the inner portion 72 is positioned between the periphery portions 30e of the two adjacent cells 30 in the first direction DA. The inner portion 72 prevents the two adjacent cells 30 in the first direction DA from approaching each other at their periphery portions 30e. 【0098】 As shown in Figures 8 and 9, in the tab block 70 attached to the case 40, the inner portion 72 may contact the central portion 30c of the cell 30 from the outside in the second direction DB. In the illustrated example, the inner portion 72 may contact the first projection 31a formed by the central portion 30c of the rib from the rib 72r provided on the periphery. The contact of the inner portion 72 with the central portion 30c from the outside in the second direction DB restricts the outward movement of the cell 30 in the second direction DB. According to this specific example, multiple cells 30 can be stably held within the case 40. 【0099】 As shown in Figures 9 and 10, in a tab block 70 attached to case 40, the inner portion 72 may contact the notched wall portion 45 from the inside in the second direction DB. In the illustrated example, the inner portion 72 may contact the inner surface 45a of the notched wall portion 45 from a rib 72r provided on the periphery. The contact of the inner portion 72 with the notched wall portion 45 from the inside in the second direction DB may restrict the outward movement of the tab block 70 relative to case 40 in the second direction DB. 【0100】 In the examples shown in Figures 9 and 11, a pair of outer portions 73 are provided on the tab block 70. The pair of outer portions 73 are connected to the insulating base portion 71 from the side. As shown in Figure 9, in the tab block 70 mounted on the case 40, each outer portion 73 is connected to the insulating base portion 71 from the outside in the third direction DC. The outer portion 73 approaches the notched guide wall portion 46 from the outside in the second direction DB. The outer portion 73 approaches the notched guide wall portion 46 from the outside in the third direction DC. The outer portion 73 extends in the second direction DB and the third direction DC. The outer portion 73 may be located between two adjacent electrode members 80 in the first direction DA. The outer portion 73 may insulate between two adjacent electrode members 80 in the first direction DA. 【0101】 In the examples shown in Figures 9 to 11, the insulating base portion 71 and the pair of outer portions 73 form the outer surface 70s of the tab block 70 on the edges facing away from the inner portion 72. As shown in Figure 9, in the tab block 70 attached to the case 40, the outer surface 70s faces outward in the second direction DB. The outer surface 70s faces the cover 50 and the second direction DB. The tab block 70 can contact the protrusion 52 of the cover 50 from the outside in the second direction DB on its outer surface 70s. Contact with the protrusion 52 on the outer surface 70s restricts the outward movement of the tab block 70 in the second direction DB. 【0102】 Incidentally, as disclosed in JP2019-67679A, conventional energy storage module includes a case that houses multiple cells, each containing tabs, and tab blocks that insulate the tabs of adjacent cells from each other. The tab blocks are mounted to the case from outside the cell-housing space in the case, so as to be positioned between the two tabs of two adjacent cells. 【0103】 When a force is applied to a conventional energy storage module from the external environment, the tab block may be subjected to a force from within the space containing the cells in the case outward, due to the case and the cells. This type of force can cause the tab block to move outward from the case. This outward movement may even cause the tab block to detach from the case. Outward movement of the tab block relative to the case, or detachment from the case, can lead to problems with stable insulation between adjacent tabs. 【0104】 In contrast, in one specific example of the energy storage element module 20 according to this embodiment, the energy storage element module 20 comprises a plurality of cells 30 stacked in a first direction DA, each cell 30 including a tab 35 protruding in a second direction DB that is not parallel to the first direction DA; a case 40 housing the plurality of cells 30; an insulating tab block 70 positioned between two tabs 35 of two adjacent cells 30 in the first direction DA; and a cover 50 attached to the case 40, which contacts the tab block 70 from the outside in the second direction DB and restricts the outward movement of the tab block 70 in the second direction DB. According to this specific example, the tab block 70 is prevented from moving outward in the second direction DB relative to the case 40. As a result, the tab block 70 is prevented from moving outward in the second direction DB relative to the tabs 35 of the cells 30 housed in the case 40. Therefore, according to this specific example, the tabs 35 of two adjacent cells 30 in the first direction DA can be stably isolated from each other by the tab block 70. 【0105】 In the examples shown in Figures 9 and 11, the outer portion 73 has a rib 73r rising from the first surface 70a. In the tab block 70 attached to the case 40, the rib 73r extends to the first side SA1 in the first direction DA. The rib 73r includes a first surface 73ra facing inward in the second direction DB and a second surface 73rb facing outward in the second direction DB. 【0106】 In the example shown in Figure 9, the rib 73r faces the end face 46s of the notched guide wall 46 and the second direction DB at the first surface 73ra. The notched guide wall 46 can contact the first surface 73ra of the rib 73r of the inner-to-outer portion 73 at the end face 46s in the second direction DB. The contact between the notched guide wall 46 and the rib 73r restricts the inward movement of the tab block 70 in the second direction DB. By restricting the inward movement of the tab block 70 in the second direction DB, the tab block 70 can stably insulate adjacent cells 30 in the first direction DA. 【0107】 In the example shown in Figure 9, the rib 73r faces the first surface 82a of the conductive base portion 82 of the electrode member 80 (described later) in the second direction DB on its second surface 73rb. The rib 73r can contact the first surface 82a of the conductive base portion 82 from the inside in the second direction DB. The contact between the rib 73r and the conductive base portion 82 restricts the inward movement of the electrode member 80 in the second direction DB. According to this specific example, the tab block 70 allows the electrode member 80 to be stably positioned in the case 40. 【0108】 In the examples shown in Figures 9 to 11, a pair of protrusions 74 are provided on the tab block 70. The protrusions 74 protrude from the outer end of the outer part 73. In the tab block 70 attached to the case 40, the protrusions 74 protrude from the outer part 73 to one side in the first direction DA. As shown in Figures 9 and 20, when the first surface 70a of the tab block 70 faces the first side SA1 in the first direction DA, the protrusions 74 protrude from the outer part 73 to the second side in the first direction DA. As shown in Figures 10 and 20, when the second surface 70b of the tab block faces the first side SA1 in the first direction DA, the protrusions 74 protrude from the outer part 73 to the first side SA1 in the first direction DA. 【0109】 In the example shown in Figure 10, a pair of connecting protrusions 75 are provided on the tab block 70. The connecting protrusions 75 project laterally toward the insulating base portion 71 from the end opposite to the end that forms the outer surface 70s of the outer portion 73. 【0110】 As shown in Figure 9, in the tab block 70 attached to the case 40, the connecting projection 75 is inserted into the first recess 48a. The connecting projection 75 may contact the outer surface 45b of the notched wall portion 45 from the outside in the second direction DB. That is, the notched wall portion 45 may contact the tab block 70 from the inside in the second direction DB. The contact between the notched connecting projection 75 and the notched wall portion 45 may restrict the inward movement of the tab block 70 relative to the case 40 in the second direction DB. According to this specific example, the tab block 70 can be stably positioned on the case 40 in the second direction DB. 【0111】 In the example shown in Figure 9, the connecting projection 75 can move within the first recess 48a formed in the notched guide wall 46. Unlike the illustrated example, the connecting projection 75 may also be movable within the second recess 48b formed in the notched guide wall 46. The connecting projection 75 located within the first recess 48a may contact the inner surface 46aa of the first rib 46a from the inside in the second direction DB. The contact between the connecting projection 75 and the first rib 46a may restrict the outward movement of the tab block 70 relative to the case 40 in the second direction DB. According to this specific example, the tab block 70 can be stably positioned on the case 40 in the second direction DB. 【0112】 Next, the electrode member 80 will be described, mainly with reference to Figures 8, 9, and 12. The electrode member 80 is positioned between the tabs 35 of two adjacent cells 30 in the first direction DA. The electrode member 80 is conductive. The electrode member 80 is electrically connected to the tabs 35. As shown in Figure 8, the electrode member 80 may be positioned between two adjacent cell units 36 in the first direction DA. The electrode member 80 may be housed in a case 40 and electrically connected to the tabs 35 of two or more adjacent cells 30 in the first direction DA. The electrode member 80 may be made of metal. 【0113】 The electrode member 80 is attached to the case 40. In the example shown in Figure 8, the electrode member 80 is attached to the third side wall portion 44c or the fourth side wall portion 44d. The electrode member 80 attached to the third side wall portion 44c is located between the first cell unit 361 and the second cell unit 362, between the second cell unit 362 and the third cell unit 363, between the fourth cell unit 364 and the fifth cell unit 365, between the sixth cell unit 366 and the seventh cell unit 367, and between the seventh cell unit 367 and the eighth cell unit 368. The electrode member 80 attached to the fourth side wall portion 44d is located between the first cell unit 361 and the second cell unit 362, between the third cell unit 363 and the fourth cell unit 364, between the fifth cell unit 365 and the sixth cell unit 366, and between the seventh cell unit 367 and the eighth cell unit 368. 【0114】 In the example shown in Figure 12, the electrode member 80 is a bent plate-shaped member. The electrode member 80 includes a pair of connecting portions 81 formed by a pair of ends, and a conductive base portion 82 located between the pair of connecting portions 81. The pair of connecting portions 81 and the conductive base portion 82 extend elongated in the same direction. In the illustrated example, the connecting portions 81 and the conductive base portion 82 face each other. 【0115】 In the examples shown in Figures 9 and 12, each connection portion 81 has a first surface 81a facing the conductive base portion 82 and a second surface 81b opposite to the first surface 81a. The conductive base portion 82 has a first surface 82a facing each connection portion 81 and a second surface 82b opposite to the first surface 82a. The connection portion 81 faces the conductive base portion 82 in the direction normal to the first surface 81a. The conductive base portion 82 faces the connection portion 81 in the direction normal to the first surface 82a. 【0116】 As shown in Figures 9 and 12, the electrode member 80 may include connecting portions 83 between each connection portion 81 and the conductive base portion 82. In the illustrated example, a pair of connecting portions 83 are provided. The connecting portions 83 are located between each connection portion 81 and the conductive base portion 82 in the bent plate-shaped electrode member 80. One end of the connecting portion 83 is connected to the connection portion 81. The other end of the connecting portion 83 is connected to the conductive base portion 82. As shown in Figure 12, the connecting portion 83 extends in a direction in which each connection portion 81 and the conductive base portion 82 face each other. 【0117】 The connecting portion 83 causes the first surface 81a of each connecting portion 81 and the first surface 82a of the conductive base portion 82 to face each other while being separated from each other. As shown in Figure 9, the first surface 81a of the connecting portion 81 and the first surface 82a of the conductive base portion 82 are separated from each other with a gap LL. The second surface 81b of the connecting portion 81 and the first surface 82a of the conductive base portion 82 are separated from each other with a gap LH. 【0118】 In the examples shown in Figures 9 and 12, the electrode member 80 has a shape that is symmetrical with respect to the center line in the direction in which the connecting portion 81 and the conductive base portion 82 extend. 【0119】 In the example shown in Figure 9, the connector 81 is attached to the case 40. The connector 81 attached to the case 40 extends in the first direction DA along the third direction DC. The end of the connector 81 opposite to the end that connects to the connecting portion 83 is inserted as a protrusion 84 from the first side SA1 in the first direction DA into the second recess 48b. In the second direction DB, the protrusion 84 is located between the first rib 46a and the second rib 46b provided on the notched guide wall portion 46. In the protrusion 84, the first surface 81a of the connector 81 faces the inner surface 46ba of the second rib 46b and the second direction DB. In the protrusion 84, the second surface 81b of the connector 81 faces the outer surface 46ab of the first rib 46a and the second direction DB. 【0120】 The first surface 81a of the connecting portion 81 can contact the inner surface 46ba of the second rib 46b from the inside in the second direction DB at the protrusion 84. The contact of the first surface 81a of the connecting portion 81 with the inner surface 46ba of the second rib 46b restricts the outward movement of the connecting portion 81 in the second direction DB relative to the notched guide wall 46. In other words, the outward movement of the electrode member 80 in the second direction DB relative to the case 40 is restricted when the protrusion 84 provided on the connecting portion 81 is inserted into the second recess 48b. According to this specific example, the electrode member 80 attached to the case 40 can be stably held in the second direction DB. 【0121】 The protrusion 84 can contact the notched guide wall 46 from the outside in the third direction DC. The contact of the protrusion 84 with the notched guide wall 46 from the outside in the third direction DC can restrict the movement of the electrode member 80 relative to the case 40 in the third direction DC. In particular, in the illustrated example, when one connector 81 contacts the notched guide wall 46 from the outside in the third direction DC, the other connector 81 is located within the second recess 48b. That is, the pair of connectors 81 attached to the case 40 are restricted from moving relative to the case 40 in the third direction DC such that they always include a portion located within the second recess 48b. 【0122】 The electrode member 80 is attached to the case 40 by attaching a pair of connecting parts 81 to the case 40. In the illustrated example, the electrode member 80 is attached to the third side wall portion 44c or the fourth side wall portion 44d, which includes the notched guide wall portion 46, by inserting the pair of connecting parts 81 into the second recesses 48b provided in the notched guide wall portion 46. 【0123】 As shown in Figure 9, in the electrode member 80 attached to the case 40, the conductive base portion 82 extends in the third direction DC. The conductive base portion 82 is a plate-shaped portion facing the second direction DB. The first surface 82a of the conductive base portion 82 faces inward in the second direction DB. The second surface 82b of the conductive base portion 82 faces outward in the second direction DB. In the conductive base portion 82, the first surface 82a and the second surface 82b face each other in the second direction DB. 【0124】 In the examples shown in Figures 6 and 9, the distance LL between the first surface 81a of the connecting portion 81 and the first surface 82a of the conductive base portion 82 is greater than the distance D4 between the inner surface 46ba and the end surface 46s of the second rib 46b in the second direction DB. The distance LH between the second surface 81b of the connecting portion 81 and the first surface 82a of the conductive base portion 82 is smaller than the distance D3 between the outer surface 46ab and the end surface 46s of the first rib 46a in the second direction DB. 【0125】 In the example shown in Figure 9, the tabs 35 overlap the conductive base portion 82 from the outside in the second direction DB. Multiple tabs 35 may overlap the conductive base portion 82 from the outside in the second direction DB. In the illustrated example, the tip portion 35B, which is located furthest inward in the second direction DB, is in surface contact with the second surface 82b of the conductive base portion 82 from the outside in the second direction DB. 【0126】 In the examples shown in Figures 9 and 10, as previously explained, the tab block 70 contacts the cell 30 from the outside in the second direction DB, thereby restricting the outward movement of the cell 30, including the tab 35, in the second direction DB. Also, as previously explained, the tab block 70 contacts the conductive base portion 82 from the inside in the second direction DB, thereby restricting the inward movement of the electrode member 80, including the conductive base portion 82, in the second direction DB. Therefore, when the tab 35 makes surface contact with the electrode member 80 from the outside in the second direction DB, the tab block 70 can stably electrically connect the tab 35 and the electrode member 80. 【0127】 In the example shown in Figure 20, the conductive base portion 82 is welded to the conductive base portion 82 by a tab 35 (tip portion 35B) that makes surface contact with the conductive base portion 82 from the second surface 82b at a weld portion MP located in the center in the third direction DC. The weld portion MP extends in the third direction DC. The conductive base portion 82 is welded to the tab 35 at three weld portions MP arranged in the first direction DA. If multiple tabs 35 overlap the conductive base portion 82 from the outside in the second direction DB, the conductive base portion 82 and the adjacent tip portions 35B in the second direction DB may be welded to each other. 【0128】 The conductive base portion 82 and the tab 35 may be welded by various methods. For example, the conductive base portion 82 and the tab 35 may be laser welded. 【0129】 The conductive base portion 82 faces the case 40 from the outside in the second direction DB. In the example shown in Figure 9, the first surface 82a of the conductive base portion 82 faces the end surface 46s of each notched guide wall portion 46 from the outside in the second direction DB. 【0130】 The electrode member 80 may contact the case 40 from the outside in the second direction DB. In the example shown in Figure 9, the electrode member 80 contacts the end face 46s of the notched guide wall 46 from the outside in the second direction DB at a pair of contact positions TP located on the first surface 82a of the conductive base portion 82, due to the relationship between the spacing LL and spacing D4 and the relationship between the spacing LH and spacing D3 described above. That is, the conductive base portion 82 may contact the case 40 from the outside in the second direction DB. 【0131】 In the example shown in Figure 9, the pair of contact points TP are separated from each other in the third direction DC, with the weld portion MP in between. That is, each contact point TP is located outward in the third direction DC from the weld portion MP. The pair of contact points TP are located inward in the third direction DC from the end in the third direction DC, i.e., the connection portion with the connecting portion 83 in the illustrated example. 【0132】 When case 40 contacts the contact position TP of the conductive base portion 82 from the inside in the second direction DB, the distance LL between the first surface 81a of the connecting portion 81 and the first surface 82a of the conductive base portion 82 is the distance between the end surface 46s in the second direction DB and the first surface 81a of the connecting portion 81. When case 40 contacts the contact position TP of the conductive base portion 82 from the inside in the second direction DB, the distance LH between the second surface 81b of the connecting portion 81 and the first surface 82a of the conductive base portion 82 is the distance between the end surface 46s in the second direction DB and the second surface 81b of the connecting portion 81. 【0133】 When case 40 contacts the contact position TP of the conductive base portion 82 from the inside in the second direction DB, case 40 restricts the inward movement of the conductive base portion 82 in the second direction DB. In the illustrated example, each notched guide wall portion 46 can contact the contact position TP of the conductive base portion 82 at its end face 46s. As a result, the notched guide wall portion 46 can restrict the inward movement of the electrode member 80, including the conductive base portion 82, in the second direction DB at its end face 46s. 【0134】 The conductive base portion 82 may be provided with screw holes 82H into which screws engage. The screws that engage with the screw holes 82H may be used to fix the wiring within the energy storage element module 20 to the conductive base portion 82. In the illustrated example, the conductive base portion 82 is provided with two screw holes arranged in the third direction DC. 【0135】 In the example shown in Figure 9, each connecting portion 83 extends in the second direction DB. Each connecting portion 83 is a plate-like portion that extends in the first direction DA and the third direction DC. At its inner end in the second direction DB, each connecting portion 83 is connected to the outer end of the connecting portion 81 in the third direction DC. At its outer end in the second direction DB, each connecting portion 83 is connected to the outer end of the conductive base portion 82 in the third direction DC. Each connecting portion 83 faces the notched guide wall portion 46 from the outside in the third direction DC. 【0136】 The operation of the illustrated energy storage module 20 will be explained. Specifically, an example of how to assemble the illustrated energy storage module 20 will be described. 【0137】 First, the cell 30 is placed in the case 40. In the illustrated example of the energy storage element module 20, the cell 30 is placed in the case 40 in a state that constitutes a cell unit 36. The cell unit 36 ​​is placed in the case 40 in the following order, starting with the eighth cell unit 368, which is located on the second side in the first direction DA, then the seventh cell unit 367, the sixth cell unit 366, the fifth cell unit 365, the fourth cell unit 364, the third cell unit 363, the second cell unit 362, and the first cell unit 361, according to the procedure described below. 【0138】 Next, the eighth cell unit 368 is placed in case 40. The eighth cell unit 368 is placed in case 40 by the following procedure. 【0139】 Firstly, the eighth cell unit 368 is housed in the case 40. The eighth cell unit 368 is housed in the case 40 by moving from the state shown in Figure 13 to the second side in the first direction DA relative to the case 40. Each tab unit 37 of the eighth cell unit 368 passes through a notch C provided in either the third side wall portion 44c or the fourth side wall portion 44d. 【0140】 The eighth cell unit 368, which moves to the second side in the first direction DA relative to the case 40, is superimposed on the bottom wall portion 42 of the case 40 on the second surface 36b. As shown in Figures 8 and 13, the eighth cell unit 368 may be joined to the bottom wall portion 42 by a joining material 38 provided on the second surface 36b. In the eighth cell unit 368 superimposed on the bottom wall portion 42, a pair of tab units 37 extend into a notch C. Figure 14 shows a tab unit 37 extending into a notch C provided in the third side wall portion 44c. 【0141】 Secondly, the electrode member 80 is placed on top of the tab unit 37 of the eighth cell unit 368. By placing the electrode member 80 on top of the tab unit 37, the electrode member 80 is placed on top of the tab 35. The electrode member 80 is placed on the tab unit 37 that forms the negative electrode terminal of the eighth cell unit 368, that is, the tab unit 37 that forms the negative electrode terminal of the cell unit assembly 39. As shown in Figure 14, the electrode member 80 is attached to the third side wall portion 44c. The electrode member 80 is attached to the third side wall portion 44c by inserting each of the protrusions 84 provided on the pair of connecting portions 81 into the second recess 48b described above from the first side SA1 in the first direction DA. 【0142】 The electrode member 80 attached to the third side wall portion 44c moves in the first direction DA relative to the case 40 along the second recess 48b. The electrode member 80 moving in the first direction DA relative to the case 40 overlaps the tab unit 37 in the first direction DA at the conductive base portion 82. At the electrode member 80 overlapping the tab unit 37, the first surface 82a of the conductive base portion 82 faces inward in the second direction DB. In particular, at the contact position TP, the first surface 82a of the conductive base portion 82 faces the end face 46s in the second direction DB. The second surface 82b of the conductive base portion 82 faces outward in the second direction DB. 【0143】 Thirdly, the tab unit 37, including tab 35, is bent. In the example shown in Figure 15, the tab unit 37 is bent from the position indicated by the dashed line in the figure, around an axis parallel to the third direction, toward the first side SA1 in the first direction DA. The bent tab unit 37 extends toward the first direction DA along the third direction DC. The bending of the tab unit 37 forms a base end 37A and a tip end 37B bent relative to the base end 37A. The tab 35 included in the tab unit 37 is bent to form a base end 35A and a tip end 35B bent relative to the base end 35A. As the tab unit 37 is bent in this way, as shown in Figure 8, the tip end 35B of the tab 35 located on the first side SA1 in the first direction DA of the eighth cell unit 368 faces the second surface 82b of the conductive base portion 82 toward the second direction DB. 【0144】 As described above, the eighth cell unit 368 is placed in case 40. Next, the seventh cell unit 367, which overlaps the eighth cell unit 368, is placed in case 40. The seventh cell unit 367 is placed in case 40 by the following procedure. 【0145】 First, the tab block 70 is placed on top of the tab 35. The tab block 70 can be placed on a tab 35 (tab unit 37) located on either side of the second direction DB. In the example shown in Figure 16, the tab block 70 is placed on a tab unit 37 located on the first side SB1 in the second direction DB. The tab block 70 is placed on a tab unit 37 from the first side SA1 in the first direction DA. 【0146】 The tab block 70 can be attached to either the third side wall portion 44c or the fourth side wall portion 44d. In the example shown in Figure 16, the tab block 70 is attached to the third side wall portion 44c. The tab block 70 is attached to the third side wall portion 44c by inserting each of the pair of connecting protrusions 75 into the first recess 48a described above from the first side SA1 in the first direction DA. 【0147】 The tab block 70 attached to the third side wall portion 44c moves along the first recess 48a in the first direction DA relative to the case 40. The tab block 70 moving in the first direction DA relative to the case 40 overlaps with the tab unit 37 in the first direction DA at the insulating base portion 71. 【0148】 In the example shown in Figure 16, the tab block 70 overlaps the electrode member 80 attached to the third side wall portion 44c from the first side SA1 in the first direction DA. The electrode member 80 may be covered by the tab block 70 from the first side SA1 in the first direction DA. The electrode member 80 may be located between a pair of protrusions 74 in the third direction DC. 【0149】 Secondly, the electrode member 80 is placed on top of the tab 35. The electrode member 80 can be placed on a tab 35 (tab unit 37) located on either side in the second direction DB. In the example shown in Figure 17, the electrode member 80 is placed on a tab unit 37 located on the second side in the second direction DB. The electrode member 80 is placed on the tab unit 37 from the first side SA1 in the first direction DA by the method described above. 【0150】 Thirdly, the seventh cell unit 367 is housed in the case 40. The seventh cell unit 367 is housed in the case 40 by moving from the state shown in Figure 18 to the second side in the first direction DA relative to the case 40. Each tab unit 37 of the seventh cell unit 367 passes through a notch C provided in either the third side wall portion 44c or the fourth side wall portion 44d. 【0151】 The seventh cell unit 367, which moves to the second side in the first direction DA relative to case 40, is superimposed on the eighth cell unit 368 in the first direction DA. As shown in Figure 8, the seventh cell unit 367 faces the first surface 36a of the eighth cell unit 368 on its second surface 36b. The seventh cell unit 367 may be joined to the eighth cell unit 368 by a bonding material provided on the second surface 36b. 【0152】 As described above, the seventh cell unit 367 is housed in the case 40. In the seventh cell unit 367 superimposed on the eighth cell unit 368, a pair of tab units 37 extend into the notch C. Figure 19 shows a tab unit 37 extending into the notch C provided in the third side wall portion 44c. In the examples shown in Figures 18 and 19, the tab unit 37 located on the second side in the second direction DB includes the portion facing the tab unit 37 of the eighth cell unit 368 in the first direction DA. 【0153】 Fourth, the tab unit 37 of the seventh cell unit 367 is folded together with the tab unit 37 of the eighth cell unit 368, which is located on the second side in the first direction DA. In the example shown in Figure 19, the tab unit 37 located on the second side in the second direction DB is folded together with the tab unit 37 of the eighth cell unit 368. 【0154】 In the example shown in Figure 19, the tab unit 37 of the seventh cell unit 367 is bent to the second side in the first direction DA, about an axis parallel to the third direction DC, from the position indicated by the dashed line in the figure. The tab unit 37 of the eighth cell unit 368 is bent to the first side in the first direction DA, about an axis parallel to the third direction DC, from the position indicated by the dashed line in the figure. The bent tab unit 37 extends in the first direction DA along the third direction DC. The bending of the tab unit 37 forms a base end 37A and a tip end 37B bent relative to the base end 37A. The bending of the tab 35 included in the tab unit 37 forms a base end 35A and a tip end 35B bent relative to the base end 35A. 【0155】 In the example shown in Figure 19, in the bent tab unit 37 of the seventh cell unit 367, the tip 35B of the tab 35 located on the second side in the first direction DA faces the second surface 82b of the conductive base portion 82 and the second direction DB. In the bent tab unit 37 of the seventh cell unit 367, the tip 35B of the tab 35 located on the first side SA1 in the first direction DA faces the tip 35B of the tab 35 located on the first side SA1 in the first direction DA of the eighth cell unit 368 and the second direction DB. 【0156】 As described above, the seventh cell unit 367 is placed inside the case 40. The sixth cell unit 366, which overlaps with the seventh cell unit 367, is placed inside the case 40 by the procedure described above for placing the seventh cell unit 367 inside the case 40. The fifth cell unit 365, which overlaps with the sixth cell unit 366, is placed inside the case 40 by the procedure described above for placing the seventh cell unit 367 inside the case 40. The fourth cell unit 364, which overlaps with the fifth cell unit 365, is placed inside the case 40 by the procedure described above for placing the seventh cell unit 367 inside the case 40. The third cell unit 363, which overlaps with the fourth cell unit 364, is placed inside the case 40 by the procedure described above for placing the seventh cell unit 367 inside the case 40. The second cell unit 362, which overlaps with the third cell unit 363, is placed inside the case 40 by the procedure described above for placing the seventh cell unit 367 inside the case 40. 【0157】 Next, the first cell unit 361 is placed in the case 40. The first cell unit 361 is placed in the case 40 by the following procedure. 【0158】 First, the tab block 70 is placed on top of the second cell unit 362. The tab block 70 is placed on top of the tab unit 37 located on the first side SB1 in the second direction DB of the second cell unit 362 by the method described above. 【0159】 Secondly, two electrode members 80 are stacked on a pair of tab units 37 of the second cell unit 362. The two electrode members 80 are stacked on the tab unit 37 located on the first side SA1 in the first direction DA, on the tab unit 37 located on the first side SB1 in the second direction DB, and on the tab unit 37 located on the second side, respectively, using the method described above. Of the two electrode members 80, the electrode member 80 located on the first side SB1 in the second direction DB is housed in a tab block 70, as shown in Figures 8 and 19. 【0160】 Thirdly, the first cell unit 361 is housed in the case 40. The first cell unit 361 is housed in the case 40 in the manner described above. In the first cell unit 361, which is superimposed on the second cell unit 362 located on the second side in the first direction DA, the pair of tab units 37 extend into the notch C. 【0161】 Fourth, the pair of tab units 37 of the first cell unit 361 are folded. The tab unit 37 located on the second side in the second direction DB is folded together with the tab unit 37 of the second cell unit 362 located on the second side in the first direction DA. Each tab unit 37 is folded to the second side in the first direction DA in the manner described above. In this way, the first cell unit 361 is placed in the case 40. 【0162】 Next, the tab 35 facing the second direction DB and the conductive base portion 82 are welded together in surface contact. As shown in Figure 9, in order to bring the tab 35 facing the second direction DB and the conductive base portion 82 into surface contact, a force F is applied to the welded portion MP of the conductive base portion 82 from the outside in the second direction DB. 【0163】 Incidentally, in the conventional energy storage element module disclosed in JP2012-109275A, two adjacent cells in the stacking direction are electrically connected to each other by overlapping and welding their tabs and electrode members (busbars). Generally, when welding two adjacent members in one direction, it is required that the two members be in close contact from the viewpoint of stable welding. In the energy storage element module, in order to bring the tabs and electrode members into close contact during welding, an external force is applied to the area where the tabs and electrode members are to be welded. However, the externally applied force can cause the tabs and electrode members to deform significantly. Unintended deformation of the tabs and electrode members can make it difficult to stably weld the tabs and electrode members together. 【0164】 In contrast, in one specific example of the energy storage element module 20 according to this embodiment, the energy storage element module 20 includes a plurality of cells 30 stacked in a first direction DA, each cell 30 having a tab 35 protruding in a second direction DB that is not parallel to the first direction DA; a case 40 housing the plurality of cells 30; a pair of connecting parts 81 attached to the case 40; and an electrode member 80 having a conductive base part 82 located between the pair of connecting parts 81 and extending in a third direction DC that is not parallel to both the first direction DA and the second direction DB. The tab 35 is welded to the conductive base part 82 in surface contact from the outside in the second direction DB. The case 40 contacts the conductive base part 82 from the inside in the second direction DB at a pair of positions TP between the ends of the conductive base part 82 in the third direction DC and the welded portion MP between the tab 35 and the electrode member 80, thereby restricting the inward movement of the conductive base part 82 in the second direction DB. In other words, case 40 contacts the conductive base portion 82 from the inside in the second direction DB (the side closer to the center of gravity of the cell in the second direction DB) at a pair of positions TP that are on the inside in the third direction DC (the side closer to the welded portion MP in the third direction DC) of both ends of the conductive base portion 82, and on both the outside in the third direction DC (the side further away from the welded portion MP in the third direction DC) of the welded portion MP between the tab 35 and the electrode member 80, thereby restricting the inward movement of the conductive base portion 82 in the second direction DB. According to this specific example, when the conductive base portion 82 contacts case 40 from the outside in the second direction DB, case 40 can stably support the conductive base portion 82 from the inside in the second direction DB against a force applied to the conductive base portion 82 from the outside in the second direction DB. This allows the position of the conductive base portion 82 and the position of the tab 35 in surface contact with the conductive base portion 82 to be stabilized when welding the conductive base portion 82 and the tab 35 from the outside in the second direction DB. Therefore, according to this specific example, the tab 35 and the electrode member 80 can be easily welded. As a result, according to this specific example, multiple cells 30 housed in the case 40 can be easily electrically connected to one another. 【0165】 As described above, the tab 35 facing the second direction DB and the conductive base portion 82 are welded together. Next, the cover 50 is attached to the case 40 from the outside of the second direction DB. The cover 50 may be attached to the case 40 by the fixing portions 47 provided on the first side wall portion 44a and the second side wall portion 44b engaging with the receiving holes 53 of the cover 50. The cover 50 may also be attached to the case 40 by the fixing portion 54 of the cover 50 engaging with the receiving holes 43 provided on the bottom wall portion 42. 【0166】 Next, the lid 60 is attached to the case 40 from the first side SA1 in the first direction DA. The lid 60 may also be attached to the case 40 by the fixing portion 62 of the lid 60 engaging with receiving holes 49 provided in the first side wall portion 44a and the second side wall portion 44b. 【0167】 The energy storage element module 20 is assembled in the manner described above. The energy storage element unit 10 may also be assembled by housing the assembled energy storage element module 20 in the housing body 16. 【0168】 In the embodiment described above, the energy storage element module 20 includes a plurality of cells 30 stacked in a first direction DA, each cell 30 having a tab 35 protruding in a second direction DB that is not parallel to the first direction DA; a case 40 housing the plurality of cells 30; a pair of connecting parts 81 attached to the case 40; and an electrode member 80 having a conductive base part 82 located between the pair of connecting parts 81 and extending in a third direction DC that is not parallel to both the first direction DA and the second direction DB. The tab 35 is welded to the conductive base part 82 in surface contact from the outside in the second direction DB. The case 40 contacts the conductive base part 82 from the inside in the second direction DB at a pair of positions TP between the ends of the conductive base part 82 in the third direction DC and the welded portion MP of the tab 35 and the electrode member 80, thereby restricting the inward movement of the conductive base part 82 in the second direction DB. In this specific example, case 40 can stably support the conductive base portion 82 that contacts the second direction DB from the outside, and the tab 35 that makes surface contact with the conductive base portion 82 from the outside in the second direction DB. This stabilizes the position of the conductive base portion 82 and the position of the tab 35 that makes surface contact with the conductive base portion 82 in the second direction DB. Therefore, the tab 35 and the electrode member 80 can be stably welded from the outside in the second direction DB. 【0169】 Furthermore, in the embodiment described above, the energy storage element module 20 comprises a plurality of cells 30 stacked in a first direction DA, each cell 30 including a tab 35 protruding in a second direction DB that is not parallel to the first direction DA; a case 40 housing the plurality of cells 30; an insulating tab block 70 positioned between two tabs 35 of two adjacent cells 30 in the first direction DA; and a cover 50 attached to the case 40, which contacts the tab block 70 from the outside in the second direction DB, thereby restricting the outward movement of the tab block 70 in the second direction DB. In this specific example, the cover 50 suppresses the outward movement of the tab block 70 relative to the tabs 35 in the second direction DB. As a result, the tabs 35 of two adjacent cells 30 in the first direction DA can be stably insulated from each other by the tab block 70. 【0170】 Although one embodiment has been described with reference to specific examples, the above-mentioned example does not limit the embodiment. The above-described embodiment can be implemented in various other examples, and various omissions, substitutions, modifications, and additions can be made without departing from its essence. 【0171】 In one specific example of the energy storage element module 20 described above, the connection portion 81 of the electrode member 80 was provided with a protrusion 84 at the end opposite to the end connected to the connecting portion 83. The protrusion 84 was inserted into a second recess 48b provided on the outward-facing surface of the notched guide wall portion 46 in the third direction DC. However, the example is not limited to the illustrated example, and the protrusion 84 may be inserted into a first recess 48a provided on the outward-facing surface of the notched guide wall portion 46 in the third direction DC. In this example, the distance LL between the first surface 81a of the connection portion 81 and the first surface 82a of the conductive base portion 82 is greater than the distance D2 between the inner surface 46aa and the end surface 46s of the first rib 46a in the second direction DB. In this example, the distance LH between the second surface 81b of the connecting portion 81 and the first surface 82a of the conductive base portion 82 is smaller than the distance D1 between the notched wall portion 45 that partitions the first recess 48a from the inside in the second direction DB and the end face 46s. 【0172】 In one specific example of the energy storage element module 20 described above, the connection portion 81 of the electrode member 80 was provided with a protrusion 84 at the end opposite to the end connected to the connecting portion 83. The protrusion 84 was inserted into a second recess 48b provided on the outward-facing surface of the notched guide wall portion 46 in the third direction DC. However, the example is not limited to the one shown, and a protrusion may be provided on the outward-facing surface of the notched guide wall portion 46 in the third direction DC. A recess may be provided on the connection portion 81 of the electrode member 80. The protrusion provided on the outward-facing surface of the notched guide wall portion 46 in the third direction DC may be inserted into a recess provided in the connection portion 81. [Explanation of Symbols] 【0173】 10: Energy storage element unit, 15: Housing, 20: Energy storage element module, 30: Cell, 35: Tab, 35A: Base end, 35B: Tip end, 40: Case, 45: Notched wall, 46: Notched guide wall, 50: Cover, 70: Tab block, 80: Electrode member, 81: Connection part, 82: Conductive base part, 83: Connecting part

Claims

[Claim 1] A plurality of cells stacked in a first direction, each cell including a tab protruding in a second direction nonparallel to the first direction, A case for housing the aforementioned multiple cells, An insulating tab block is placed between two tabs in two adjacent cells in the first direction, A storage element module comprising: a cover attached to the case, which contacts the tab block from the outside in the second direction and restricts the outward movement of the tab block in the second direction. [Claim 2] The case has a bottom wall portion that supports the plurality of cells from the first direction, and a side wall portion that extends from the bottom wall portion in the first direction. The energy storage element module according to claim 1, wherein the side wall portion contacts the tab block from the inside in the second direction, thereby restricting the inward movement of the tab block in the second direction. [Claim 3] The energy storage element module according to claim 1, wherein the tab block contacts the cell from the outside in the second direction and restricts the outward movement of the cell in the second direction. [Claim 4] The tab is further comprising an electrode member electrically connected to the aforementioned tab, The energy storage element module according to claim 1, wherein the tab block contacts the electrode member from the inside in the second direction, thereby restricting the inward movement of the electrode member in the second direction. [Claim 5] The tab is further comprising an electrode member electrically connected to the aforementioned tab, The tab block contacts the cell from the outside in the second direction, restricting the outward movement of the cell in the second direction. The tab block contacts the electrode member from the inside in the second direction, thereby restricting the inward movement of the electrode member in the second direction. The energy storage element module according to claim 1, wherein the tab is in surface contact with the electrode member from the outside in the second direction. [Claim 6] The cover includes a plate-like portion that forms the outer surface of the energy storage element module, and a protruding portion that extends from the plate-like portion toward the case. The energy storage element module according to claim 1, wherein the tab block is in contact with the protruding portion. [Claim 7] The energy storage element module according to claim 6, wherein the cover includes ribs protruding from the plate-like portion toward the case. [Claim 8] The energy storage element module according to claim 1, wherein adjacent cells in the first direction are joined to each other by a plurality of bonding members that extend in the second direction and are arranged in a third direction that is non-parallel to both the first and second directions. [Claim 9] A storage element module according to any one of claims 1 to 8, A storage element unit comprising a housing for housing the aforementioned storage element module. [Claim 10] A building comprising the energy storage element unit described in claim 9.

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