Energy storage device

Abstract

To provide a power storage device capable of suppressing the occurrence of stress at a connection between a bus bar and an external terminal when a force is applied to a bus bar holding member.SOLUTION: A power storage device includes: a plurality of power storage elements aligned in a first direction, each power storage element having a pair of external terminals disposed at an interval therebetween in a third direction perpendicular to each of the first direction and a second direction at an edge in the second direction perpendicular to the first direction; an adjacent member disposed between adjacent power storage elements; a plurality of bus bars 6 connecting between the external terminals together aligned in the first direction and disposed at an interval therebetween in the third direction; a bus bar holding member disposed along the plurality of power storage elements and holding the plurality of bus bars; and a pair of locking parts 23A for locking the bus bar holding member to the adjacent member. The bus bar holding member extends from a position corresponding to one edge of the power storage element in the third direction to a position corresponding to another edge and also extends in the first direction, and the pair of locking parts 23A are disposed at a mutual interval in the third direction.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to an energy storage device including a plurality of energy storage elements. [Background technology]

[0002] Conventionally, there has been known an energy storage device including a battery assembly 510 and a busbar module 500 attached to the upper surface (upper surface of the cell) of the battery assembly 510, as shown in Fig. 18 (see Patent Document 1). Note that Fig. 18 shows only the vicinity of the surface of the battery assembly 510 where the busbar module 500 is attached.

[0003] The battery assembly 510 is constructed by arranging multiple rectangular parallelepiped-shaped batteries 511 and housing them in an insulating case. Each battery 511 has a positive electrode column 512 and a negative electrode column 513 protruding upward from one electrode surface. The electrode surface of each battery 511 is part of the top surface (cell top surface) of the battery assembly.

[0004] The battery assembly 510 is formed by arranging the positive poles 512 and negative poles 513 of a plurality of batteries 511 alternately, and connecting the positive poles 512 and negative poles 513 of adjacent batteries 511 with bus bars 501. The positive poles 512 and negative poles 513 of each battery 511 are formed with threads for threading nuts thereon.

[0005] The busbar module 500 is attached, with its longitudinal direction facing the battery arrangement direction, to the upper surface of the cell of the battery assembly 510. The busbar module 500 is configured by holding a plurality of busbars 501 on resin plates 502, respectively.

[0006] The bus bar 501 is provided with a pair of insertion holes through which the positive electrode pole 512 and the negative electrode pole 513 of adjacent batteries 511 are inserted, respectively. The resin plate 502 is provided with a plurality of accommodation sections 503 that respectively accommodate the plurality of bus bars 501. Each accommodation section 503 is formed by being surrounded by a substantially rectangular peripheral wall 504 that rises in a frame shape from the bottom wall of the resin plate 502.

[0007] The busbars 501 housed in the housing sections 503 are engaged with claws protruding from the peripheral walls of the respective housing sections 503 and are held within the respective housing sections 503. The positive electrode poles 512 and negative electrode poles 513 of adjacent batteries are inserted into the insertion holes of the busbars 501 held in the housing sections 503, and nuts are fastened to the positive electrode poles 512 and negative electrode poles 513 protruding from these insertion holes. In this way, the busbar module 500 is attached and held on the top surfaces of the cells of the battery assembly 510 by fastening nuts to the electrode poles 512, 513.

[0008] In the above energy storage device, as described above, bus bar module 500 is attached to the upper surface of the cell of battery assembly 510 by fastening nuts to each of electrode posts 512, 513. Therefore, for example, when a force is applied to bus bar module 500 in a direction away from battery assembly 510, the force is applied (stress is likely to be concentrated) to the connection portion between bus bar 501 held in housing portion 503 of bus bar module 500 (resin plate 502) and each battery 511 constituting battery assembly 510, and this makes the connection portion prone to damage. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2014-186973 Summary of the Invention [Problem to be solved by the invention]

[0010] Therefore, an object of this embodiment is to provide an electricity storage device that can suppress the generation of stress at the connection portion between the bus bar and the external terminal when force is applied to the bus bar holding member. [Means for solving the problem]

[0011] The power storage device of this embodiment is a plurality of storage elements arranged in a first direction, each of which has a pair of external terminals at an end portion in a second direction perpendicular to the first direction and spaced apart in a third direction perpendicular to both the first direction and the second direction; an adjacent member disposed between adjacent energy storage elements; a plurality of bus bars that connect the external terminals aligned in the first direction to each other and are spaced apart in the third direction; a bus bar holding member that is arranged along the plurality of energy storage elements and holds the plurality of bus bars; a pair of locking portions that lock the bus bar holding member to the adjacent member, the bus bar holding member extends in the third direction from a position corresponding to one end of the energy storage element to a position corresponding to the other end of the energy storage element, and also extends in the first direction; The pair of locking parts are arranged with a gap between them in the third direction. [Effects of the Invention]

[0012] As described above, according to this embodiment, it is possible to provide an electricity storage device that can suppress the occurrence of stress at the connection portion between the bus bar and the external terminal when force is applied to the bus bar holding member. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a perspective view of the electricity storage device according to this embodiment. [Figure 2] Figure 2 is a plan view of the energy storage device. [Figure 3] Figure 3 is a diagram illustrating the configuration of the plate portion of the energy storage device. [Figure 4] FIG. 4 is a diagram illustrating the configuration of the bus bar holding member of the plate portion. [Figure 5] FIG. 5 is a perspective view of the power storage device in a state where the device body and the plate portion are separated from each other. [Figure 6] FIG. 6 is an exploded perspective view of the device main body with some of the components omitted. [Figure 7] FIG. 7 is a plan view of the device main body. [Figure 8] FIG. 8 is an enlarged view of the portion indicated by VIII in FIG. [Figure 9] FIG. 9 is a perspective view of a first adjacent member included in the power storage device. [Figure 10] Figure 10 is an enlarged view of one end of the first adjacent member in the Z-axis direction. [Figure 11] FIG. 11 is a perspective view of a second adjacent member included in the electricity storage device. [Figure 12] Figure 12 is an enlarged view of one end of the second adjacent member in the Z-axis direction. [Figure 13] FIG. 13 is a partially enlarged view of the cross section taken along the line XIII-XIII in FIG. [Figure 14] Figure 14 is an enlarged plan view of the thermistor holder and its surrounding area at an intermediate position in the X-axis direction of the energy storage device, excluding the cover and harness. [Figure 15] FIG. 15 is an enlarged cross-sectional view taken along the line XV-XV in FIG. [Figure 16] FIG. 16 is an enlarged plan view of the thermistor holding portion at the end position in the X-axis direction of the power storage device and its surrounding area with the lid portion and harness removed. [Figure 17] FIG. 17 is an enlarged cross-sectional view taken along the line XVII-XVII in FIG. [Figure 18] Figure 18 is a perspective view of the vicinity of the busbar module in a conventional battery assembly. DETAILED DESCRIPTION OF THE INVENTION

[0014] The power storage device of this embodiment is a plurality of storage elements arranged in a first direction, each of which has a pair of external terminals at an end portion in a second direction perpendicular to the first direction and spaced apart in a third direction perpendicular to both the first direction and the second direction; an adjacent member disposed between adjacent energy storage elements; a plurality of bus bars that connect the external terminals aligned in the first direction to each other and are spaced apart in the third direction; a bus bar holding member that is arranged along the plurality of energy storage elements and holds the plurality of bus bars; a pair of locking portions that lock the bus bar holding member to the adjacent member, the bus bar holding member extends in the third direction from a position corresponding to one end of the energy storage element to a position corresponding to the other end of the energy storage element, and also extends in the first direction; The pair of locking parts are arranged with a gap between them in the third direction.

[0015] In this manner, by arranging a pair of engagement portions at a distance from each other in the third direction, the busbar holding member is engaged with an adjacent member near the portion where the busbar is held, and movement of the busbar holding member relative to adjacent members around the busbar (adjacent members arranged between the energy storage elements) is effectively suppressed, thereby suppressing the generation of stress at the connection between the busbar and the external terminal when the busbar holding member attempts to move relative to the multiple energy storage elements.

[0016] In the power storage device, The pair of locking parts may be positioned between busbars that are spaced apart in the third direction.

[0017] With this configuration, warping of the busbar holding member, such as bulging of the central portion in the third direction (moving away from the adjacent member in the second direction), is effectively suppressed, thereby suppressing the generation of stress at the connection point between the busbar and the external terminal due to the warping.

[0018] In the power storage device, The bus bar holding member is a bus bar holding portion that is disposed at an end portion in the third direction and holds the bus bar; a thermistor holding portion that is disposed at a position closer to a center of the bus bar holding member than the bus bar holding portion in the third direction and that holds the thermistor in a state where the thermistor is pressed against the energy storage element, The locking portion may be positioned between the busbar holding portion and the thermistor holding portion.

[0019] With this configuration, a locking portion is positioned between the busbar holding portion and the thermistor holding portion. That is, the busbar holding member is locked to an adjacent member near both the busbar holding portion and the thermistor holding portion. As a result, not only is the movement of the busbar holding portion relative to the adjacent member (the adjacent member positioned between the energy storage elements), but the movement of the thermistor holding portion relative to the adjacent member is also effectively suppressed. This allows for the suppression of stress generation at the connection between the busbar and the external terminal when the busbar holding member attempts to move relative to multiple energy storage elements, while also maintaining a suitable pressure of the thermistor against the energy storage elements.

[0020] In addition, in the power storage device, the bus bar holding member includes: an electric wire arrangement portion that is disposed adjacent to the thermistor holding portion in the third direction and in which an electric wire is arranged; and a partition portion that separates the thermistor holding portion from the electric wire arrangement portion, the adjacent member has a main body portion located between the energy storage elements and an engaging protrusion portion protruding from the main body portion toward the bus bar holding member, the partition portion has an engaged portion with which the engaging protrusion engages, The locking portion may be composed of the engaging projection and the engaged portion.

[0021] In this way, by using a part of the partition (engaged portion) that separates the thermistor holding portion and the wire arrangement portion to lock the busbar holding portion to the adjacent member, the dimensions of the busbar holding member in the third direction can be reduced.

[0022] In addition, in the power storage device, The locking portion may lock the busbar holding member to the adjacent member in the first direction that is adjacent to the energy storage element against which the thermistor is pressed.

[0023] With this configuration, since the busbar holding member is locked to the adjacent member near the thermistor holding portion, the movement of the thermistor holding portion relative to the energy storage element against which the thermistor is pressed is effectively suppressed. As a result, even if the busbar holding member attempts to move relative to multiple energy storage elements, the pressing of the thermistor against the energy storage elements is suitably maintained.

[0024] In addition, in the power storage device, The locking portion may be provided at each of the positions that sandwich the energy storage element against which the thermistor is pressed in the first direction.

[0025] In this way, by providing locking portions at each position that clamps the energy storage element against which the thermistor is pressed in the first direction, the movement of the thermistor holding portion relative to the energy storage element against which the thermistor is pressed is effectively suppressed. As a result, even if the busbar holding member attempts to move relative to multiple energy storage elements, the pressing of the thermistor against the energy storage element is suitably maintained.

[0026] In addition, in the power storage device, each of the plurality of energy storage elements has a gas release valve disposed at an end in the second direction; The bus bar holding member is an opening extending along the gas release valves arranged in the first direction between the pair of locking portions and opening in the second direction; an elongated member extending along the opening and closing the opening, The elongated member may be configured to be removable from the opening, or to guide the gas in the first direction when the gas is released from the gas discharge valve.

[0027] Hereinafter, one embodiment of the present invention will be described with reference to Figures 1 to 17. The names of the components (elements) in this embodiment are those used in this embodiment and may differ from the names of the components (elements) in the background art.

[0028] 1 to 6, the energy storage device 1 of this embodiment includes a plurality of energy storage elements 10 arranged in a first direction, adjacent members 2 arranged between adjacent energy storage elements 10, a plurality of bus bars 6 that electrically connect the energy storage elements 10, a bus bar holding member 7 that holds the plurality of bus bars 6, and at least a pair of locking portions L (see FIG. 13) that lock the bus bar holding member 7 to the adjacent members 2. Specifically, the configuration is as follows.

[0029] This energy storage device 1 comprises a device main body A having a plurality of energy storage elements 10 each having an external terminal 14, and a plate portion B including a bus bar holding member 7 and covering the surface of the device main body A on which the external terminals 14 are arranged.

[0030] 7 and 8, the device main body A includes a plurality of energy storage elements 10 arranged in the predetermined direction, a plurality of adjacent members 2 adjacent to the energy storage elements 10 in the predetermined direction, and a holding member 3 that holds the plurality of energy storage elements 10 and the plurality of adjacent members 2. The device main body A also includes a first fastening member 4 that fixes at least one adjacent member 2 to the holding member 3, and an insulator 5 that provides insulation between the plurality of energy storage elements 10 and the holding member 3.

[0031] Each of the plurality of energy storage elements 10 is a primary battery, a secondary battery, a capacitor, or the like. The energy storage element 10 of this embodiment is a chargeable and dischargeable non-aqueous electrolyte secondary battery. More specifically, the energy storage element 10 is a lithium ion secondary battery that utilizes electron transfer that occurs with the transfer of lithium ions.

[0032] Specifically, each energy storage element 10 includes an electrode assembly, a case 11 that houses the electrode assembly together with an electrolyte, an external terminal 14 that is at least partially exposed to the outside of the case 11, and a current collector that connects the electrode assembly and the external terminal 14. The energy storage element 10 of this embodiment includes a pair of external terminals 14, and the pair of external terminals 14 are arranged at ends of the energy storage element 10 in a second direction that is orthogonal to the first direction, with a gap in between in a third direction that is orthogonal to both the first and second directions. In the following description, the first direction is defined as the X-axis direction of a Cartesian coordinate system, the third direction is defined as the Y-axis direction of the Cartesian coordinate system, and the second direction is defined as the Z-axis direction of the Cartesian coordinate system.

[0033] In the electrode body, positive and negative electrodes are stacked alternately with a separator in between. In this electrode body, lithium ions move between the positive and negative electrodes, causing the energy storage element 10 to charge and discharge.

[0034] Case 11 has a case body 12 with an opening at one end in the Z-axis direction (upper in FIG. 6), and a plate-like cover plate 13 that closes the opening of case body 12. This case body 12 has a rectangular tubular shape (i.e., a rectangular tubular shape with a bottom) with the other end in the Z-axis direction (lower in FIG. 6) closed, and case 11 has a rectangular parallelepiped shape (six-sided shape).

[0035] Specifically, the case body 12 comprises a plate-shaped closing portion 121 and a cylindrical body portion (peripheral wall) 122 connected to the periphery of the closing portion 121.

[0036] The closure portion 121 is located at the lower end of the case body 12 when the case body 12 is positioned with the opening facing upwards (i.e., it becomes the bottom wall of the case body 12 when the opening is facing upwards). The closure portion 121 is rectangular in shape, elongated in the Y-axis direction when viewed from the Z-axis direction.

[0037] The body portion 122 is rectangular in shape, more specifically, a flattened rectangular shape. The body portion 122 has a pair of long wall portions 123 extending from the long side at the periphery of the closure portion 121, and a pair of short wall portions 124 extending from the short side at the periphery of the closure portion 121. In this body portion 122, the short wall portions 124 connect the ends of the pair of long wall portions 123 that are opposite each other in the X-axis direction, thereby forming the rectangular body portion 122.

[0038] The cover plate 13 is a plate-like member that closes the opening of the case body 12. The cover plate 13 has a cover plate main body 131 that is a rectangular plate that is long in the Y-axis direction, and a gas exhaust valve 132 that is arranged in the cover plate main body 131.

[0039] The gas exhaust valve 132 exhausts gas to the outside when the pressure inside the case 11 exceeds a predetermined value due to gas generation inside the case 11. The gas exhaust valve 132 in this embodiment is disposed in the center of the cover plate main body 131 in the Y-axis direction.

[0040] The cover plate 13 thus configured is joined to the case body 12 with the peripheral edge of the cover plate 13 overlapping the peripheral edge of the opening of the case body 12, thereby forming the case 11.

[0041] Each of the pair of external terminals 14 is a part that is electrically connected to the external terminals 14 of another energy storage element 10 or to an external device, etc. Each external terminal 14 is formed of a conductive material. For example, each external terminal 14 is formed of a highly weldable metal material such as aluminum or an aluminum alloy, or a copper alloy.

[0042] The pair of external terminals 14 are arranged at both ends in the Y-axis direction (longitudinal direction) of the cover plate 13. That is, the pair of external terminals 14 are arranged at positions on the cover plate 13 with the gas exhaust valve 132 sandwiched between them.

[0043] The energy storage elements 10 described above are flat rectangular parallelepipeds, and multiple energy storage elements 10 are arranged in the Z-axis direction with the wide surfaces (long walls 123) of the case 11 facing each other. At this time, the gas discharge valves 132 of each energy storage element 10 are arranged in a line in the X-axis direction (see Figures 7 and 8). In addition, one external terminal 14 of each energy storage element 10 and the other external terminal 14 are arranged in the X-axis direction at each position with the gas discharge valve 132 in between.

[0044] Each of the multiple adjacent members 2 is insulating and is positioned between energy storage elements 10 aligned in the X-axis direction, or between an energy storage element 10 and a member aligned with respect to the energy storage element 10 in the X-axis direction (in this embodiment, a part of the holding member 3). The adjacent members 2 in this embodiment are made of resin. These adjacent members 2 form a flow path R through which a temperature-regulating fluid (a gas such as air in this embodiment) can flow between adjacent energy storage elements 10. These multiple adjacent members 2 include multiple types of adjacent members 2A, 2B, and 2C.

[0045] Specifically, the plurality of adjacent members 2 include a first adjacent member 2A positioned between two adjacent energy storage elements 10, a second adjacent member 2B positioned between adjacent energy storage elements 10 and fixed to the holding member 3, and a third adjacent member 2C positioned between the holding member 3 and the energy storage element 10 at the outermost end in the X-axis direction, adjacent to the energy storage element 10. That is, the energy storage device 1 comprises a first adjacent member 2A, a second adjacent member 2B, and a third adjacent member 2C as adjacent members 2. The energy storage device 1 of this embodiment comprises a plurality of first adjacent members 2A, one second adjacent member 2B, and two (a pair) third adjacent members 2C. Each of these plurality of first adjacent members 2A is positioned between each energy storage element 10, excluding the positions between the energy storage elements 10 where the second adjacent member 2B is positioned.

[0046] 9 and 10 , each of the first adjacent members 2A includes a first main body portion 21A extending in a direction perpendicular to the X-axis direction between adjacent energy storage devices 10 in the X-axis direction, an engaging protrusion 22A protruding from the first main body portion 21A toward one side in the Z-axis direction (i.e., toward the busbar holding member 7), and at least one first restricting portion 25A restricting movement of an adjacent energy storage device 10 relative to the first main body portion 21A. Each first adjacent member 2A in this embodiment includes a locking portion 23A protruding from the first main body portion 21A toward one side in the Z-axis direction and an extension portion 24A extending in the X-axis direction from one end of the first main body portion 21A in the Z-axis direction. Each of the first adjacent members 2A also defines at least one flow path R through which a temperature control fluid can flow between adjacent energy storage devices 10.

[0047] The first main body portion 21A is a portion that faces the long wall portion 123 of the case 11 of the energy storage element 10 while partially abutting against it. This first main body portion 21A cooperates with an adjacent energy storage element 10 to form a flow path R through which a temperature-regulating fluid can flow between the energy storage element 10 and the first main body portion 21A. The first main body portion 21A of this embodiment is a rectangular plate having a size corresponding to that of the energy storage element 10 when viewed from the X-axis direction, and has a cross-sectional shape along the XZ plane (a plane including the X-axis direction and the Z-axis direction) that is a rectangular waveform.

[0048] The extension portions 24A extend from the center in the Y-axis direction at one end of the first main body portion 21A in the Z-axis direction, specifically, from a position corresponding to the gas release valve 132 of the energy storage element 10 adjacent to the first adjacent member 2A having the extension portion 24A, to one side and the other side in the X-axis direction. That is, the first adjacent member 2A has a pair of extension portions 24A. In this embodiment, each extension portion 24A has an axisymmetric shape with respect to an imaginary line extending in the X-axis direction from the center in the Y-axis direction of the first main body portion 21A. Each of the pair of extension portions 24A extends along the XY plane (a plane including the X-axis direction and the Y-axis direction) and has an arc-shaped notch 241 at its tip corresponding to the gas release valve 132.

[0049] The locking portion 23A is a portion that locks the member 77 that constitutes the plate portion B (see FIG. 13). In this embodiment, a pair of locking portions 23A are provided, and are arranged in the center in the Y-axis direction at one end of the first main body portion 21A in the Z-axis direction, more specifically, at positions that sandwich the extension portion 24A in the Y-axis direction. The pair of locking portions 23A sandwich the member 77 that constitutes the plate portion B in the Y-axis direction.

[0050] The engaging projection 22A is the part that engages with the busbar holding member 7. In this embodiment, a pair of engaging projections 22A are provided, and they are located at the center in the Y-axis direction of one end of the first main body 21A in the Z-axis direction, specifically, at a position that sandwiches the pair of locking portions 23A in the Y-axis direction.

[0051] Each engaging protrusion 22A has a shaft portion 221 extending in the Z-axis direction from the first main body portion 21A, and an engaging portion 222 that engages with the busbar holding member 7. This shaft portion 221 is flexible, and when a force toward the center of the first adjacent member 2A in the Y-axis direction is applied to the engaging portion 222, the engaging portion 222 bends so as to move toward the center. In addition, the engaging portion 222 has an engaging slope 222a that is positioned outward in the Y-axis direction as it extends from the tip toward the first main body portion 21A.

[0052] First restricting portions 25A extend in the X-axis direction from at least the corners of rectangular first main body portion 21A and abut against energy storage elements 10 (more specifically, case 11) adjacent to first main body portion 21A from the outside in the YZ plane direction, thereby restricting relative movement of energy storage elements 10 in the YZ plane direction with respect to first main body portion 21A. First restricting portions 25A in this embodiment extend from first main body portion 21A to one side and the other in the X-axis direction.

[0053] 11 and 12 , the second adjacent member 2B includes a second main body portion 21B extending in a direction perpendicular to the X-axis direction (the YZ plane (a plane including the Y-axis direction and the Z-axis direction) direction) between two adjacent energy storage elements 10, an engaging protrusion 22B protruding from the second main body portion 21B toward one side in the Z-axis direction, at least one second restricting portion 25B restricting movement of an energy storage element 10 adjacent to the second main body portion 21B relative to the second main body portion 21B, and a second fastening member 26B used to fix the second adjacent member 2B to the holding member 3. The second adjacent member 2B of this embodiment also includes an extension portion 24B extending in the X-axis direction from one end of the second main body portion 21B in the Z-axis direction. The second adjacent member 2B also forms at least one flow path R through which a temperature control fluid can flow between the second adjacent energy storage elements 10 and the adjacent energy storage elements 10.

[0054] The second body portion 21B faces the long wall portion 123 of the case 11 of the energy storage element 10 while partially abutting against it. This second body portion 21B cooperates with an adjacent energy storage element 10 to form a flow path R through which a temperature-regulating fluid can flow between the energy storage element 10 and the second body portion 21B. The dimension of this second body portion 21B in the X-axis direction is larger than the dimension of the first body portion 21A in the X-axis direction (i.e., it is thick). The second body portion 21B of this embodiment is a rectangular plate having a size corresponding to that of the energy storage element 10 when viewed from the X-axis direction. This second body portion 21B has a plurality of ridges 211B that extend in the Y-axis direction and are arranged at intervals in the Z-axis direction. These plurality of ridges 211B protrude from a surface 212B of the second body portion 21B that faces the energy storage element 10.

[0055] The extension portions 24B have the same configuration as the extension portion 24A of the first adjacent member 2A. That is, the extension portions 24B are portions that extend from the second main body portion 21B to one side and the other in the X-axis direction, and each have an arc-shaped notch 241 at its tip. The extension portions 24B of this embodiment have an axisymmetric shape with respect to a virtual line that extends in the X-axis direction from the center position in the Y-axis direction of the second main body portion 21B.

[0056] The engaging projection 22B has the same configuration as the engaging projection 22B of the first adjacent member 2A. That is, a pair of engaging projections 22B are arranged on the second main body 21B, and each engaging projection 22B has a shaft portion 221 and an engaging portion 222 having an engaging inclined surface 222a.

[0057] Second restricting portions 25B extend in the X-axis direction from at least the corners of rectangular second main body portion 21B and abut against energy storage elements 10 (more specifically, case 11) adjacent to second main body portion 21B from the outside in the YZ plane direction, thereby restricting relative movement of energy storage elements 10 in the YZ plane direction with respect to second main body portion 21B. Second restricting portions 25B of the present embodiment extend from second main body portion 21B to one side and the other in the X-axis direction.

[0058] The second fastening members 26B are respectively disposed at each end of the second main body portion 21B in the Y-axis direction. Each of the plurality of second fastening members 26B fastens the second adjacent member 2B and the holding member 3 by engaging with the first fastening member 4. In this embodiment, each second fastening member 26B is an insert nut. Also, each first fastening member 4 in this embodiment is a bolt, which fastens the second adjacent member 2B and the holding member 3 by engaging (threading) with the second fastening member 26B while inserted through the holding member 3.

[0059] Each of the two third adjacent members 2C has a third main body portion 21C extending in a direction perpendicular to the X-axis direction between the energy storage elements 10 adjacent to each other in the X-axis direction and a part 31 of the holding member 3, and at least one third restricting portion 25C that restricts movement of the energy storage elements 10 adjacent to the third main body portion 21C relative to the third main body portion 21C. In addition, each of the two third adjacent members 2C forms at least one flow path R between the adjacent energy storage elements 10 and the third adjacent members 2C, through which a temperature adjustment fluid can flow.

[0060] The third body portion 21C is a portion that faces the long wall portion 123 of the energy storage element 10 while partially abutting against it. Like the first body portion 21A of the first adjacent member 2A and the second body portion 21B of the second adjacent member 2B, this third body portion 21C also cooperates with the adjacent energy storage element 10 to form a flow path R through which a temperature-regulating fluid can flow between the energy storage element 10 and the third body portion 21C. The third body portion 21C of this embodiment has a rectangular plate shape whose size corresponds to that of the energy storage element 10 when viewed from the X-axis direction. The third body portion 21C has a plurality of ridges 211C that extend in the Y-axis direction and are arranged at intervals in the Z-axis direction. These plurality of ridges 211C protrude from a surface 212C of the third body portion 21C that faces the energy storage element 10.

[0061] Third restricting portion 25C extends in the X-axis direction from at least a corner of rectangular third main body portion 21C and abuts against energy storage element 10 (more specifically, case 11) adjacent to third main body portion 21C from the outside in the YZ plane direction, thereby restricting relative movement of energy storage element 10 in the YZ plane direction with respect to third main body portion 21C. Third restricting portion 25C of this embodiment extends from third main body portion 21C toward one side in the X-axis direction (toward energy storage element 10).

[0062] 1, 5, and 6, the holding member 3 holds the stack D by surrounding the periphery of the stack D, which is made up of energy storage elements 10 and adjacent members 2 arranged alternately in the X-axis direction. That is, the holding member 3 holds the plurality of energy storage elements 10 and the plurality of adjacent members 2 together by surrounding the periphery of the plurality of energy storage elements 10 and the plurality of adjacent members 2. The holding member 3 is made of a conductive material such as metal.

[0063] Specifically, the holding member 3 has a pair of terminal members 31 arranged on both sides of the stack D in the X-axis direction, an extension member 32 extending in the X-axis direction along the stack D at a position adjacent to the stack D in the Y-axis direction, and a connecting member 33 connecting the terminal members 31 and the extension members 32.

[0064] Each of the pair of end members 31 is positioned to sandwich a third adjacent member 2C between itself and the energy storage element 10 located at the end in the X-axis direction. Specifically, each of the pair of end members 31 has an end member body 311 that extends along the YZ plane and a flange portion 313 that extends from the end member body 311 away from the energy storage element 10 in the X-axis direction.

[0065] The terminal member body 311 is rectangular in shape, corresponding to the size of the energy storage element 10 when viewed from the X-axis direction. More specifically, the terminal member body 311 is a long rectangle in the Y-axis direction and has a plurality of through holes 312 at both ends in the Y-axis direction, spaced apart in the Z-axis direction. The flange portion 313 extends from one end of the terminal member body 311 in the Z-axis direction in the X-axis direction and also extends in the Y-axis direction.

[0066] Each of the pair of extension members 32 includes an extension member body 320 facing the short wall portion 124 of each energy storage element 10, a first piece portion 321 extending in the Y-axis direction along the cover plate 13 of each energy storage element 10 and in the X-axis direction from one end of the extension member body 320 in the Z-axis direction, a second piece portion 322 extending in the Y-axis direction along the closing portion 121 of each energy storage element 10 and in the X-axis direction from the other end of the extension member body 320 in the Z-axis direction, and a pair of third pieces portion 323 extending in the Y-axis direction along the end member 31 and in the Z-axis direction from each end of the extension member body 320 in the X-axis direction.

[0067] The extension member body 320 is plate-shaped and extends along the short wall portion 124 of each energy storage element 10. It has a plurality of first through-holes 3201 that penetrate in the Y-axis direction so that the temperature-regulating fluid can flow into or out of each flow path R, and a plurality of second through-holes 3202 that penetrate in the Y-axis direction at positions corresponding to each second fastening member 26B of the second adjacent member 2B. The first fastening member 4 is inserted through these second through-holes 3202.

[0068] The first arm 321 is a strip-shaped portion that is long in the X-axis direction, and the second arm 322 is also strip-shaped that is long in the X-axis direction. The width of the portion of the second arm 322 excluding both ends in the X-axis direction (the dimension in the Y-axis direction) is greater than the width of the first arm 321. Each of the pair of third arms 323 has a plurality of through holes 3231 that are spaced apart in the Z-axis direction. Each of the through holes 3231 is located at a position corresponding to a through hole 312 in the termination member 31.

[0069] Each of the multiple connecting members 33 fastens the end member 31 and the extension member 32 by inserting them through the through hole 312 of the end member 31 and the through hole 3231 of the extension member 32 (specifically, the third piece 323). In this embodiment, each connecting member 33 is composed of a bolt 331 and a nut 332.

[0070] The insulator 5 has insulating properties. The insulator 5 is disposed between the extension member 32 and the stack D. Specifically, the energy storage device 1 includes a pair of insulators 5, and each insulator 5 covers at least an area of ​​the extension member 32 facing the plurality of energy storage elements 10. As a result, each insulator 5 provides insulation between the extension member 32 and the plurality of energy storage elements 10. Each insulator 5 has through holes 51 of a size and shape corresponding to each first through hole 3201 of the extension member main body 320, at positions corresponding to each first through hole 3201 of the extension member main body 320.

[0071] As shown in FIGS. 1 to 5, the plate portion B includes a plurality of bus bars 6, at least one thermistor S for detecting the temperature of the energy storage elements 10, a bus bar holding member 7 for holding the plurality of bus bars 6, and a harness 8 having a plurality of electric wires 80 connected to the bus bars 6 and the thermistor S. For ease of explanation, FIG. 3 omits all but one cover portion 73. For ease of explanation, FIG. 4 omits not only the other cover portion 73 but also the harness 8 and the elongated member 77 (a member constituting the bus bar holding member 7: see FIG. 3).

[0072] Each of the multiple busbars 6 is a conductive plate-shaped member such as metal, and connects the external terminals 14 of different energy storage elements 10. Each of these multiple busbars 6 makes electrical contact with each other by connecting the external terminals 14 of adjacent energy storage elements 10. In this embodiment, each busbar 6 is welded to the external terminal 14. Furthermore, these multiple busbars 6 are arranged in the X-axis direction on one side in the Y-axis direction and the other side, respectively, to form a row of busbars 6 (busbar row). That is, the two busbar rows extend in the X-axis direction at positions spaced apart in the Y-axis direction (one side in the Y-axis direction and the other side).

[0073] The thermistor S comes into contact with the surface (case 11) of the energy storage element 10, and outputs a signal corresponding to the temperature of the surface of the energy storage element 10. The energy storage device 1 of this embodiment includes a plurality of thermistors S (the number of which is equal to or less than the number of energy storage elements 10 included in the energy storage device 1), and detects the temperature of a predetermined energy storage element 10 among the plurality of energy storage elements 10.

[0074] The harness 8 includes a cable portion 81 having a plurality of electric wires 80 and a connector 82 disposed at the end of the cable portion 81 .

[0075] The cable section 81 is formed by bundling together at least a portion of a plurality of electric wires 80, each with one end connected to a busbar 6 or thermistor S. The cable section 81 is positioned on the busbar holding member 7 with one end protruding from the busbar holding member 7 in the X-axis direction. A connector 82 is attached to the protruding end of the cable section 81. In this embodiment, the connector 82 is a multi-pin connector, and two of them are provided.

[0076] Each wire 80 included in this cable section 81 is electrically connected to each busbar 6 constituting one busbar row in the Y-axis direction and each busbar 6 constituting the other busbar row in the Y-axis direction. In this embodiment, the cable section 81 is drawn out from one end of the busbar holding member 7 in the X-axis direction. More specifically, the multiple wires 80 constituting the cable section 81 are drawn out together from one end of the busbar holding member 7 in the X-axis direction.

[0077] The busbar retaining member 7 has a plate-shaped retaining member body 70 that covers the surface of the laminate D where the external terminals 14 are lined up. In addition, the busbar retaining member 7 of this embodiment has a long member 77 that is detachably attached to the retaining member body 70.

[0078] The holding member body 70 is a plate-shaped member whose dimensions in the Z-axis direction are smaller than those in the X-axis and Y-axis directions, and is rectangular in shape with a size corresponding to the laminated body D when viewed from the Z-axis direction. The holding member body 70 has a plurality of busbar holding parts 71, each holding a busbar 6, a harness arrangement part (wire arrangement part) 72 on which the harness 8 is arranged, and a plurality of cover parts 73. The holding member body 70 also has a plurality of thermistor holding parts 74 on which thermistors S are held. The holding member body 70 of this embodiment has an opening 75 on which a part of the laminated body D (in this example, the gas discharge valve 132 of each energy storage element 10) is exposed when viewed from the plate part B toward the device body A (i.e., when viewed from one side in the Z-axis direction to the other) (see Figure 4).

[0079] Each of the multiple busbar holding portions 71 has a bottom wall portion 711 with a pair of openings through which the corresponding external terminals 14 of adjacent energy storage elements 10 (specifically, the positive external terminal 14 of one energy storage element 10 and the negative external terminal 14 of the other energy storage element 10) are inserted, as shown in Figures 13, 14, and 16, and a peripheral wall portion 712 extending from the bottom wall portion 711 in one direction in the Z-axis direction.

[0080] The peripheral wall portion 712 is cylindrical in shape, surrounding (i.e., encircling) the busbar 6 that connects the two external terminals 14 inserted through the opening of the bottom wall portion 711, along the periphery of the busbar 6. In this embodiment, the peripheral wall portion 712 is rectangular in shape. In addition, at least one retaining portion 7121 is provided inside the peripheral wall portion 712, and the periphery of the busbar 6 placed on the bottom wall portion 711 is restricted by at least one retaining portion 7121 from moving in one direction in the Z-axis direction (opposite side from the bottom wall portion 711), thereby holding the busbar 6 in the busbar holding portion 71.

[0081] The bus bar holding portions 71 configured as described above are aligned in the X-axis direction at one end and the other end of the holding member main body 70 in the Y-axis direction. In other words, in the holding member main body 70, two rows of bus bar holding portions 71 aligned in the X-axis direction (hereinafter also referred to as "holding portion rows 71A") are arranged at an interval in the Y-axis direction. This holding portion row 71A extends from one end to the other end of the bus bar holding member 7 in the X-axis direction. Adjacent bus bar holding portions 71 in this holding portion row 71A share a portion of their peripheral wall portions 712. That is, two bus bar holding portions 71 adjacent in the X-axis direction in the holding portion row 71A share a portion of their peripheral wall portions 712 (wall).

[0082] The harness placement portion 72 is a groove-shaped portion in the holding member main body 70, and a cable portion 81 of the harness 8 is placed inside the harness placement portion 72. The harness placement portion 72 has two first portions 721 that extend in the X-axis direction along each holding portion row 71A at positions adjacent to the inside of each holding portion row 71A in the Y-axis direction (toward the center C of the holding member main body 70: see FIG. 4), and a second portion 722 that extends in the Y-axis direction and connects one end of each of the first portions 721 in the X-axis direction. In the harness placement portion 72 of this embodiment, the cable portion 81 is placed in each of the first portions 721 and the second portion 722, and the harness 8 is placed such that the end of the harness 8 on the connector 82 side protrudes in the X-axis direction from the center of the second portion 722 in the Y-axis direction.

[0083] Each side wall portion 7211 of the first portion 721 in the Y-axis direction extends continuously or intermittently in the X-axis direction. The bottom wall portion 7212 of the first portion 721 also extends continuously or intermittently in the X-axis direction. In each of the first portions 721 in this embodiment, both the side wall portion 7211 and the bottom wall portion 7212 extend intermittently in the X-axis direction.

[0084] The bottom wall portion 7212 of the first portion 721 and the inner side wall portion 7211 in the Y-axis direction have notches 7213 (or holes) extending in the Z-axis direction at positions corresponding to the engaging protrusions 22A, 22B of each adjacent member 2A, 2B, and when positioned within the notch 7213 (or inserted through the hole), the engaging portions 222 of the engaging protrusions 22A, 22B engage with the peripheral portion 7213a of the notch 7213 (or hole) (in this embodiment, the peripheral portion of the notch 7213: hereinafter also referred to as the "engaged portion") 7213a (see Figure 13).

[0085] Each of the multiple lid portions 73 is a plate-shaped portion that releasably covers one end of the peripheral wall portion 712 of the bus bar holding portion 71 in the Z-axis direction and one end of the first portion 721 of the harness placement portion 72 in the Z-axis direction. Each lid portion 73 is a rectangular plate, and a part of its periphery is connected to a part of the end of the peripheral wall portion 712 in the Z-axis direction (see FIGS. 3 and 4). The connection portion between the peripheral wall portion 712 and the lid portion 73 is flexible. The lid portion 73 of this embodiment is a rectangular plate-shaped portion large enough to cover two bus bar holding portions 71 adjacent to each other in the X-axis direction and a portion of the first portion 721 adjacent to the two bus bar holding portions 71 in the Y-axis direction, or a rectangular plate-shaped portion large enough to cover one bus bar holding portion 71 and a portion of the first portion 721 adjacent to the one bus bar holding portion 71 in the Y-axis direction.

[0086] The multiple thermistor holding portions 74 are arranged at intervals in the X-axis direction inside the first portion 721 in the Y-axis direction, and as also shown in Figures 15 and 17, each thermistor holding portion 74 holds the thermistor S in a state where it is pressed against the energy storage element 10 (in the example of this embodiment, the cover plate 13). In the holding member main body 70 of this embodiment, the multiple thermistor holding portions 74 are arranged at intervals in the X-axis direction at positions adjacent to the inside of the first portion 721 on one side of the center C and at positions adjacent to the inside of the first portion 721 on the other side.

[0087] The thermistor holding portion 74 of this embodiment is a portion that holds the thermistor S so as to surround the thermistor S, and the specific configuration is not limited as long as it is configured to hold the thermistor S while pressing it toward the storage element 10.

[0088] In the energy storage device 1 including the holding member main body 70 configured as described above, the engaging protrusions 22A, 22B of the adjacent members 2A, 2B, which are engaged with each other, and the engaged portion (peripheral portion of the notch 7213) 7213a of the holding member main body 70 form a locking portion L that locks the busbar holding member 7 to the adjacent members 2A, 2B (see Figure 13).

[0089] In the energy storage device 1 of this embodiment, each of the adjacent members 2A, 2B has a pair of engaging protrusions 22A, 22B, and therefore a pair of locking portions L (hereinafter also simply referred to as "locking portion pairs Lp") spaced apart from each other in the Y-axis direction are formed at positions corresponding to each of the adjacent members 2A, 2B in the energy storage device 1. That is, the energy storage device 1 includes a plurality of locking portion pairs Lp aligned in the X-axis direction.

[0090] These locking portion pairs Lp are arranged (formed) between bus bars 6 arranged at intervals in the Y-axis direction (i.e., between bus bar holding portions 71). At the end portions of the energy storage device 1 in the X-axis direction, the locking portions L lock the bus bar holding member 7 to the adjacent member (first adjacent member 2A) adjacent in the X-axis direction to the energy storage element 10 against which the thermistor S is pressed (see FIGS. 16 and 17). At the portions of the energy storage device 1 corresponding to the thermistor holding portions 74 at midpoints in the X-axis direction, the locking portions L are formed at positions that sandwich the energy storage element 10 against which the thermistor S is pressed in the X-axis direction (see FIGS. 14 and 15). That is, the busbar holding member 7 is engaged by the two engaging portions L to the adjacent members 2A, 2B adjacent to the storage element 10 against which the thermistor S is pressed on one side in the X-axis direction, and to the adjacent members 2A, 2B adjacent to the storage element 10 on the other side in the X-axis direction.

[0091] The opening 75 is a portion that extends along the gas release valves 132 that are aligned in the X-axis direction between a pair of locking portions L that make up each locking portion pair Lp, and that opens in the Z-axis direction (see FIG. 4). In this embodiment, the opening 75 extends from one end to the other end of the holding member main body 70 in the X-axis direction at the center of the holding member main body 70 in the Y-axis direction (specifically, between the thermistor holding portion 74 arranged on one side and the thermistor holding portion 74 arranged on the other side with respect to the center C of the holding member main body 70 in the Y-axis direction).

[0092] The elongated member 77 is a member that extends in the X-axis direction and is removably attached to the opening 75 of the holding member main body 70 to close the opening 75. The elongated member of this embodiment is made of an insulating material such as resin.

[0093] In the energy storage device 1 configured as described above, the pair of locking portions L constituting the locking portion pair Lp are arranged at a distance from each other in the Y-axis direction, and therefore the busbar holding member 7 is locked to the adjacent members 2A and 2B near the portion (busbar holding portion 71) that holds the busbar 6, thereby effectively suppressing movement of the busbar holding member 7 relative to the adjacent members 2A and 2B around the busbar 6 (adjacent members arranged between the energy storage elements 10). This suppresses stress generation at the connection portion between the busbar 6 and the external terminal 14 (in the example of this embodiment, the welded portion between the external terminal 14 and the busbar 6) when the busbar holding member 7 attempts to move relative to the multiple energy storage elements 10.

[0094] In the energy storage device 1 of this embodiment, each locking portion pair Lp is disposed between bus bars 6 spaced apart in the Y-axis direction. This effectively prevents warping of the bus bar holding member 7 (more specifically, the holding member main body 70) in the Y-axis direction, causing the central portion to bulge (moving away from the adjacent member 2 in the Z-axis direction). This prevents stress from occurring at the connection portion between the bus bar 6 and the external terminal 14 due to the warping. Furthermore, this configuration allows the bus bar holding member 7 to be locked to the adjacent members 2A and 2B without being affected by warping of the bus bar holding member 7 (more specifically, the holding member main body 70).

[0095] Furthermore, in the energy storage device 1 of this embodiment, the busbar holding member 7 has a busbar holding portion 71 that is disposed at an end in the Y-axis direction and that holds the busbar 6, and a thermistor holding portion 74 that is disposed closer to the center C (see FIG. 4 ) of the busbar holding member 7 in the Y-axis direction than the busbar holding portion 71 and that holds the thermistor S in a state where it is pressed against the energy storage elements 10, and a locking portion L is disposed between the busbar holding portion 71 and the thermistor holding portion 74 (see FIG. 13 ). In this way, the locking portion L is disposed between the busbar holding portion 71 and the thermistor holding portion 74, i.e., the busbar holding member 7 is locked to the adjacent members 2A and 2B near the busbar holding portion 71 and the thermistor holding portion 74, respectively. This effectively suppresses movement of the busbar holding member 7 relative to the adjacent members 2A and 2B (adjacent members disposed between the energy storage elements 10) as well as movement of the thermistor holding portion 74 relative to the adjacent members 2A and 2B. As a result, in the energy storage device 1 of this embodiment, when the busbar holding member 7 attempts to move relative to the multiple energy storage elements 10, stress is suppressed at the connection between the busbar 6 and the external terminal 14, while the thermistor S is also maintained in an appropriate position while being pressed against the energy storage elements 10.

[0096] In the energy storage device 1 of this embodiment, the busbar holding member 7 has a first portion 721 of the harness placement portion (electrical wire placement portion) 72 that is disposed adjacent to the thermistor holding portion 74 in the Y-axis direction and in which the harness 8 (more specifically, the plurality of electric wires 80 included in the cable portion 81) is disposed, and a portion (side wall portion 7211: partition portion) that separates the thermistor holding portion 74 from the first portion 721. The adjacent members 2A and 2B have main body portions 21A and 21B that are disposed between the energy storage elements 10, and engaging protrusions 22A and 22B that protrude from the main body portions 21A and 21B toward the busbar holding member 7, and the side wall portion (partition portion) 7211 has an engaged portion (periphery of the notch 7213) 7213a that engages with the engaging protrusions 22A and 22B. The engaging protrusions 22A and 22B and the engaged portion form the locking portion L. In this way, by configuring the busbar holding member 7 to engage with adjacent members 2A and 2B using a portion (engaged portion 7213a) of the side wall portion 7211 that separates the thermistor holding portion 74 and the first portion 721, the dimension of the busbar holding member 7 in the Y-axis direction can be reduced compared to when the engaged portion is configured between the first portion 721 and thermistor holding portion 74 using a portion that is not included in the first portion 721 and thermistor holding portion 74.

[0097] Furthermore, at the end in the X-axis direction of the energy storage device 1 of this embodiment, the locking portion L locks the bus bar holding member 7 to the adjacent member 2A that is adjacent in the X-axis direction to the energy storage element 10 against which the thermistor S is pressed (see FIGS. 15 and 17). In this way, because the bus bar holding member 7 is locked to the adjacent members 2A and 2B near the thermistor holding portion 74, movement of the thermistor holding portion 74 relative to the energy storage element 10 against which the thermistor S is pressed is effectively suppressed. As a result, even if the bus bar holding member 7 attempts to move relative to the multiple energy storage elements 10, the thermistor S is suitably maintained pressed against the energy storage elements 10.

[0098] Furthermore, in the vicinity of the thermistor holding portion 74 at a midpoint in the X-axis direction of the energy storage device 1 of this embodiment (a position excluding both end portions of the energy storage device 1), locking portions L are provided at positions that sandwich, in the X-axis direction, the energy storage element 10 against which the thermistor S is pressed, among the multiple energy storage elements (see FIGS. 14 and 15 ). In this way, by providing locking portions L at positions that sandwich, in the X-axis direction, the energy storage element 10 against which the thermistor S is pressed, movement of the thermistor holding portion 74 relative to the energy storage element 10 against which the thermistor S is pressed is effectively suppressed. As a result, even if the busbar holding member 7 attempts to move relative to the multiple energy storage elements 10, the thermistor S is suitably maintained pressed against the energy storage elements 10.

[0099] The power storage device of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the configuration of one embodiment can be added to the configuration of another embodiment, or part of the configuration of one embodiment can be replaced with the configuration of another embodiment. Furthermore, part of the configuration of one embodiment can be deleted.

[0100] There are no limitations on the specific configuration of the elongated member 77 of the busbar holding member 7. In the above embodiment, the elongated member 77 does not have a function of guiding gas in a predetermined direction when the gas is discharged from the gas discharge valve 132 of the energy storage element 10. However, for example, the elongated member 77 may be configured to guide the gas in the X-axis direction when the gas is discharged from the gas discharge valve 132 of the energy storage element 10, and discharge the gas to the outside from an end of the energy storage device 1 in the X-axis direction.

[0101] Furthermore, the opening 75 of the busbar holding member 7 (more specifically, the holding member main body 70) in the above embodiment extends in the X-axis direction at the center C in the Y-axis direction of the holding member main body 70, that is, at the position where the gas release valves 132 of the energy storage elements 10 of the device main body A are aligned in the X-axis direction, but is not limited to this position. The opening 75 may also be positioned at a position offset from the row of the gas release valves 132. Furthermore, multiple openings 75 may be provided.

[0102] Furthermore, although the bus bar holding member 7 in the above embodiment includes the elongated member 77, it does not necessarily have to include the elongated member 77.

[0103] Furthermore, in the energy storage device 1 of the above embodiment, the locking portion pair Lp is located inside the busbar 6 (on the center C side of the holding member body 70) which is spaced apart in the Y-axis direction, but the configuration is not limited to this. Each locking portion L constituting the locking portion pair Lp may be located outside the busbar 6 which is spaced apart in the Y-axis direction.

[0104] Furthermore, in the energy storage device 1 of the above embodiment, each adjacent member 2A, 2B has an engaging projection 22A, 22B, and each part of the holding member body 70 corresponding to the engaging projection 22A, 22B has an engaged portion 7213a, but the device is not limited to this configuration. It is also possible to have a configuration in which some of the multiple adjacent members 2A, 2B have engaging projections 22A, 22B, and each part of the holding member body 70 corresponding to the engaging projection 22A, 22B has an engaged portion 7213a.

[0105] Furthermore, although the holding member body 70 in the above embodiment has the thermistor holding portion 74, it does not necessarily have to have the thermistor holding portion 74.

[0106] Furthermore, although the locking portion L in the above embodiment is disposed on the outer side (including the outer edge) of the thermistor holding portion 74 in the Y-axis direction, this configuration is not limiting. The locking portion L may also be disposed on the inner side (including the inner edge) of the thermistor holding portion 74 in the Y-axis direction.

[0107] Furthermore, in the locking portion L of the above embodiment, the engaging protrusions 22A and 22B of adjacent members 2A and 2B engage with the engaged portion 7213a of the holding member body 70, but the configuration is not limited to this. The engaging protrusions extending from the holding member body 70 toward the device body A may engage with the engaged portion of the device body A, or the engaging protrusions extending from the holding member body 70 toward the device body A and the engaging protrusions extending from the device body A toward the holding member body 70 may engage with each other.

[0108] Furthermore, in the energy storage device 1 of the above embodiment, a locking portion L is formed at the position of the adjacent member 2 adjacent to the energy storage element 10 against which the thermistor S is pressed (i.e., the adjacent members 2A and 2B have engaging protrusions 22A and 22B), but the device is not limited to this configuration. The locking portion L may be positioned at a distance in the X-axis direction from the adjacent members 2A and 2B adjacent to the energy storage element 10 against which the thermistor S is pressed.

[0109] Furthermore, in the holding member main body 70 of the above embodiment, the engaged portion 7213a is provided on the wall 7211 that separates the first portion 721 and the thermistor holding portion 74 (a portion shared by the first portion 721 and the thermistor holding portion 74), but it may be provided in another position.

[0110] In the above embodiment, the case where the energy storage element is used as a chargeable and dischargeable non-aqueous electrolyte secondary battery (for example, a lithium ion secondary battery) has been described, but the type and size (capacity) of the energy storage element are arbitrary. In the above embodiment, a lithium ion secondary battery has been described as an example of the energy storage element, but the present invention is not limited to this. For example, the present invention can also be applied to energy storage elements of various secondary batteries, as well as primary batteries and capacitors such as electric double layer capacitors. [Explanation of symbols]

[0111] 1...Energy storage device, 2...Adjacent member, 2A...First adjacent member, 21A...First main body (main body), 22A...Engaging projection, 221...Shaft, 222...Engaging part, 222a...Engaging slope, 23A...Locking part, 24A...Extended part, 25A...First restricting part, 2B...Second adjacent member, 21B...Second main body (main body), 211B...Protrusion, 212B...Opposite surface, 22B...Engaging projection, 24B...Extended part, 25B...Second restricting part, 26B...Second fastening member, 2C...Third adjacent member, 21C...Third main body, 211C...Protrusion ,212C...Opposite surface, 25C...Third restricting part, 3...Holding member, 31...Ending member, 311...Ending member body, 312...Through hole, 313...Flange part, 32...Extending member, 320...Extending member body, 3201...First through hole, 3202...Second through hole, 321...First piece, 322...Second piece, 323...Third piece, 3231...Through hole, 33...Connecting member, 331...Bolt, 332...Nut, 4...First fastening member, 5...Insulator, 51...Through hole, 6...Busbar, 7...Busbar holding member, 70...Holding Component body, 71...busbar holding part, 71A...holding part row, 711...bottom wall part, 712...peripheral wall part, 7121...pressing part, 72...harness arrangement part, 721...first part, 7211...side wall part (partition part), 7212...bottom wall part, 7213...notch, 7213a...engaged part, 722...second part, 73...lid part, 74...thermistor holding part, 75...opening, 77...long component, 8...harness, 80...electric wire, 81...cable part, 82...connector, 10...energy storage element, 11...case, 12...case body ,121...Blocking section, 122...Body section, 123...Long wall section, 124...Short wall section, 13...Cover plate, 131...Cover plate body, 132...Gas discharge valve, 14...External terminal, 500...Busbar module, 501...Busbar, 502...Resin plate, 503...Housing section, 504...Peripheral wall, 510...Battery assembly, 511...Battery, 512...Positive electrode column, 513...Negative electrode column, A...Device body, B...Plate section, C...Center of the holding member body in the Y-axis direction, D...Laminate, L...Locking section, Lp...Pair of locking sections, R...Flow path, S...Thermistor

Claims

1. a plurality of storage elements arranged in a first direction, each of which has a pair of external terminals at an end portion in a second direction perpendicular to the first direction and spaced apart in a third direction perpendicular to both the first direction and the second direction; an adjacent member disposed between adjacent energy storage elements; a plurality of bus bars that connect the external terminals aligned in the first direction to each other and are spaced apart in the third direction; a bus bar holding member that is arranged along the plurality of energy storage elements and holds the plurality of bus bars; a pair of locking portions that lock the bus bar holding member to the adjacent member, the bus bar holding member extends in the third direction from a position corresponding to one end of the energy storage element to a position corresponding to the other end of the energy storage element, and also extends in the first direction; The pair of locking portions are arranged at an interval in the third direction, The bus bar holding member is a bus bar holding portion that is disposed at an end portion in the third direction and holds the bus bar; a thermistor holding portion that is disposed at a position closer to a center of the bus bar holding member than the bus bar holding portion in the third direction and that holds the thermistor in a state where the thermistor is pressed against the energy storage element, The locking portion is disposed between the bus bar holding portion and the thermistor holding portion.

2. The power storage device according to claim 1 , wherein the pair of locking portions are arranged between bus bars arranged at an interval in the third direction.

3. the bus bar holding member includes: an electric wire arrangement portion that is disposed adjacent to the thermistor holding portion in the third direction and in which an electric wire is arranged; and a partition portion that separates the thermistor holding portion from the electric wire arrangement portion, the adjacent member has a main body portion located between the energy storage elements and an engaging protrusion portion protruding from the main body portion toward the bus bar holding member, the partition portion has an engaged portion with which the engaging protrusion engages, The power storage device according to claim 1 or 2, wherein the locking portion is configured by the engaging protrusion and the engaged portion.

4. The energy storage device according to any one of claims 1 to 3, wherein the locking portion locks the busbar holding member to the adjacent member adjacent in the first direction to the energy storage element against which the thermistor is pressed, among the plurality of energy storage elements.

5. The storage device according to any one of claims 1 to 4, wherein the locking portions are provided at positions that sandwich the storage element against which the thermistor is pressed in the first direction, among the plurality of storage elements.

6. each of the plurality of energy storage elements has a gas release valve disposed at an end in the second direction; The bus bar holding member is an opening extending along the gas release valves arranged in the first direction between the pair of locking portions and opening in the second direction; an elongated member extending along the opening and closing the opening, The storage device according to any one of claims 1 to 5, wherein the elongated member is configured to be removable from the opening, or configured to be able to guide gas in the first direction when gas is released from the gas exhaust valve.

Images