JP2019169386A - Power storage device - Google Patents

Abstract

To provide a power storage element capable of suppressing a deterioration in pressure resistance.SOLUTION: A power storage device 10 includes: a plurality of power storage elements 100; an end member 400 disposed on a side of the plurality of power storage elements 100; a terminal block 850 (fixing member) fixed on the end member 400; and a bus bar holding member 900 disposed on an electrode terminal side of the plurality of power storage elements 100, the bus bar holding member 900 holding a bus bar 800 connecting electrode terminals of the plurality of power storage elements 100. The terminal block 850 includes a locked part 880 to which a part (locking part 920) of the bus bar holding member 900 is locked.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power storage device.

  2. Description of the Related Art Conventionally, in a power storage device including a plurality of power storage elements, a sheet metal end member (termination member) disposed at the end of the plurality of power storage elements and a terminal having a terminal electrically connected to the plurality of power storage elements A power storage device in which a base (fixing member) is locked is known (see, for example, Patent Document 1).

JP 2017-152373 A

  An electric storage element is also known in which a bus bar holding member that holds a bus bar is locked to an end member made of sheet metal.

  Incidentally, in recent years, there is a demand for engaging the bus bar holding member together with the fixing member with respect to the end member made of sheet metal. For this reason, if a structure in which the bus bar holding member is engaged with the sheet metal end member is adopted, the rigidity of the end member is lowered, and as a result, the pressure resistance of the power storage device itself may be lowered. .

  Therefore, an object of the present invention is to provide a power storage device that can suppress a decrease in pressure resistance.

  In order to achieve the above object, a power storage device according to one embodiment of the present invention includes a plurality of power storage elements, an end member disposed on a side of the plurality of power storage elements, and a fixed member fixed on the end member. A bus bar holding member disposed on the electrode terminal side of the plurality of power storage elements, the bus bar holding member holding the bus bar connecting the electrode terminals of the plurality of power storage elements, and the fixing member is a bus bar holding member A part to be locked is provided.

  According to this configuration, since the locked portion to which a part of the bus bar holding member is locked is provided on the fixing member fixed to the end member, the bus bar holding member is directly locked to the end member. Even if compared with, the freedom degree of the shape of an end member can be raised. For this reason, it is possible to employ | adopt the end member formed, for example by extrusion molding. Since the end member formed by extrusion molding has higher rigidity than the conventional end member formed of sheet metal, for example, pressure resistance against an increase in internal pressure during EOL can be improved.

  The fixing member is a terminal block including a terminal connected to at least one of the plurality of power storage elements.

  According to this structure, since a fixing member is a terminal block, these can be shared by one member. Therefore, an increase in size of the power storage device in the direction in which the plurality of power storage elements are arranged can be suppressed. The terminal block is generally formed of a material harder than the end spacer disposed between the power storage element and the end member. Therefore, even when the locked portion is provided on the end spacer, the locked state with the bus bar holding member can be stabilized when the locked portion is provided on the terminal block. If the locked state is stabilized, the pressure resistance of the power storage device itself can be further increased.

  Further, the part of the bus bar holding member is provided with a wiring support portion for supporting the wiring drawn from the bus bar holding member.

  As described above, the part of the bus bar holding member is a locking position between the bus bar holding member and the fixing member. Even if the bus bar holding member and the fixing member are misaligned, the misalignment amount is small at the locking position. That is, if the part of the bus bar holding member that is the locking position is provided with a wiring support portion that supports the wiring, the wiring can be stably supported, such as high pressure inside the power storage device, vibration, etc. It is possible to suppress the load on the wiring due to the above.

  Moreover, the wiring support part is provided with a rib disposed on the side of the wiring.

  According to this configuration, since the rib is provided on the side of the wiring, the wiring is guided by the rib. Further, the wiring support portion is reinforced by the presence of the rib. By these things, wiring can be supported more stably and the load with respect to wiring resulting from the high voltage | pressure inside of an electrical storage apparatus, a vibration, etc. can be suppressed more.

  Further, the wiring support portion is provided with a tongue portion that protrudes outward from the locking position with the locked portion of the part of the bus bar holding member and to which the wiring is attached.

  According to this, since the wiring is attached to the tongue that protrudes outward from the locking position with the locked portion, in a state in which the locking of a part of the bus bar holding member and the locked portion is maintained. The wiring can be attached to the tongue. Therefore, the wiring can be supported more stably, and a load on the wiring due to high voltage, vibration, or the like inside the power storage device can be further suppressed.

  According to the power storage device of the present invention, it is possible to suppress a decrease in pressure resistance.

It is a perspective view which shows the external appearance of the electrical storage apparatus which concerns on embodiment. It is a disassembled perspective view which shows each component at the time of decomposing | disassembling the electrical storage apparatus which concerns on embodiment. It is a perspective view which shows the positional relationship of the end member which concerns on embodiment, a terminal block, and a bus-bar holding member. It is a perspective view which shows the structure of the end member which concerns on embodiment. It is a perspective view which shows the structure of the terminal block which concerns on embodiment. It is a perspective view which shows the structure of the terminal block which concerns on embodiment. It is a bottom view which shows the structure of the terminal block which concerns on embodiment. It is sectional drawing which shows the positional relationship of the terminal block which concerns on embodiment, and its surrounding member. It is sectional drawing which shows the creeping distance of the terminal block which concerns on embodiment. It is sectional drawing which shows the creeping distance of the terminal block which concerns on a comparative example. It is sectional drawing which shows the creeping distance of the terminal block which concerns on a modification. It is a perspective view which shows the structure of the latching | locking part which concerns on embodiment. It is a perspective view which shows the structure of the latching | locking part which concerns on embodiment. It is a front view which shows the structure of the latching | locking part which concerns on embodiment. It is a side view which shows the structure of the latching | locking part which concerns on embodiment.

  Hereinafter, a power storage device according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that the embodiments described below show comprehensive or specific examples. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, manufacturing steps, order of manufacturing steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements. In each drawing, dimensions and the like are not strictly illustrated.

  In the following description and drawings, the direction in which a pair of electrode terminals in one power storage element is aligned, the direction in which the pair of short side surfaces in a container of one power storage element are opposed, the direction in which insulators are aligned, the direction in which side plates are aligned, or The alignment direction of the insulator and the side plate is defined as the X-axis direction. Further, the alignment direction of the storage elements, the alignment direction of the spacers (intermediate spacers, end spacers), the alignment direction of the end members, the alignment direction of the storage elements, the spacers, and the end members, and a pair of long side surfaces in the container of one storage element The opposing direction or the thickness direction of the power storage element, spacer, or end member is defined as the Y-axis direction. Further, the direction in which the container body and the lid of the power storage element are arranged, the direction in which the power storage element, the bus bar and the bus bar holding member are arranged, the direction in which the end member and the terminal block are arranged, or the vertical direction is defined as the Z axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect (orthogonal in this embodiment). Although the case where the Z-axis direction does not become the vertical direction may be considered depending on the usage mode, the Z-axis direction will be described below as the vertical direction for convenience of explanation. In the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the direction opposite to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction.

(Embodiment)
[1 General Description of Power Storage Device 10]
First, the configuration of the power storage device 10 will be described. FIG. 1 is a perspective view showing an appearance of power storage device 10 according to the present embodiment. FIG. 2 is an exploded perspective view showing each component when the power storage device 10 according to the present embodiment is disassembled.

  The power storage device 10 is a device that can charge electricity from the outside and discharge electricity to the outside. For example, the power storage device 10 is a battery module (assembled battery) used for power storage applications, power supply applications, and the like. Specifically, the power storage device 10 is, for example, an automobile such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV), a motorcycle, a watercraft, a snowmobile, an agricultural machine, a construction It is used as a battery for driving a moving body such as a machine or starting an engine.

  As shown in FIGS. 1 and 2, the power storage device 10 includes a plurality (12 in this embodiment) of power storage elements 100, a plurality of spacers 200 and 300 (11 spacers 200 and a pair in this embodiment). Spacer 300), a pair of end members 400, a pair of insulators 600, a pair of side plates 700, a bus bar 800, a bus bar holding member 900, and a terminal block 850. Further, a bonding member 510 is disposed between the power storage element 100 and the spacer 200, a bonding member 520 is disposed between the power storage element 100 and the spacer 300, and a bonding is performed between the spacer 300 and the end member 400. A member 530 is disposed. In addition, a pair of external terminals 810 (a positive external terminal and a negative external terminal) that are terminals of the power storage device 10 are connected to the bus bar 800. Thereby, the external terminal 810 is electrically connected to at least one of the plurality of power storage elements 100 via the bus bar 800.

  In addition, the power storage device 10 includes a wiring group 910 in which a plurality of wirings for voltage measurement, a plurality of wirings for temperature measurement, and the like of the power storage element 100 are bundled, and the wiring group 910 is one end of the bus bar holding member 900. It extends from the part. The wiring group 910 is covered with an insulator. The voltage measurement wiring is electrically connected to the electrode terminal of the storage element 100. Further, the temperature measurement wiring is electrically connected to a thermistor for measuring the temperature of the storage element 100. In the case where the power storage device 10 also includes an electrical device such as a circuit board or a relay for monitoring the charge state or the discharge state of the power storage element 100, the wiring electrically connected to these devices is also a wiring group. 910 may be included.

  The power storage element 100 is a secondary battery (unit cell) that can charge and discharge electricity, and more specifically, a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage element 100 has a flat rectangular parallelepiped shape (square shape), and electrode terminals (a positive electrode terminal and a negative electrode terminal) are provided on the upper surface thereof. In addition, the storage element 100 is disposed adjacent to the spacers 200 and 300. That is, each of the plurality of power storage elements 100 is alternately arranged with each of the plurality of spacers 200 and 300 and arranged in the Y-axis direction. In the present embodiment, eleven spacers 200 are arranged between adjacent ones of twelve power storage elements 100, and the power storage elements 100 at the ends of the twelve power storage elements 100 are arranged. A pair of spacers 300 are arranged at the sandwiched positions.

  Note that the number of power storage elements 100 is not limited to 12, and may be other than 12. Further, the shape of the power storage element 100 is not limited to a rectangular parallelepiped shape, and may be a polygonal column shape other than the rectangular parallelepiped shape, or may be a laminate type power storage element. Moreover, the electrical storage element 100 is not limited to a nonaqueous electrolyte secondary battery, A secondary battery other than a nonaqueous electrolyte secondary battery may be sufficient, and a capacitor may be sufficient as it. In addition, the storage element 100 may be a primary battery that can use stored electricity without being charged by a user, instead of a secondary battery. Further, the power storage element 100 may be a battery using a solid electrolyte.

  The spacers 200 and 300 are rectangular and plate-like spacers that are arranged on the side of the electricity storage element 100 (Y-axis plus direction or Y-axis minus direction) and insulate the electricity storage element 100 from other members. Specifically, the spacer 200 is an intermediate spacer that is disposed between two adjacent power storage elements 100 and insulates between the two power storage elements 100. More specifically, bonding members 510 are disposed on both sides of the spacer 200 in the Y-axis direction, and the spacer 200 and the power storage elements 100 on both sides in the Y-axis direction are bonded by the bonding member 510. In the present embodiment, eleven spacers 200 are arranged corresponding to twelve power storage elements 100. However, when the number of power storage elements 100 is other than twelve, the number of spacers 200 is also stored. It is changed according to the number of elements 100.

  The spacer 300 is an end spacer that is disposed between the power storage element 100 at the end and the end member 400 and insulates between the power storage element 100 at the end and the end member 400. Specifically, a bonding member 520 is disposed on the power storage element 100 side of the spacer 300, and the spacer 300 and the power storage element 100 are bonded by the bonding member 520. A joining member 530 is disposed on the end member 400 side of the spacer 300, and the spacer 300 and the end member 400 are joined by the joining member 530.

  The end member 400 and the side plate 700 are members that press the power storage element 100 from the outside in the arrangement direction (Y-axis direction) of the plurality of power storage elements 100. That is, the end member 400 and the side plate 700 press the respective power storage elements 100 included in the plurality of power storage elements 100 from both sides in the arrangement direction by sandwiching the plurality of power storage elements 100 from both sides in the arrangement direction.

  Specifically, the end member 400 is disposed on both sides in the Y-axis direction of the plurality of power storage elements 100, and sandwiches the plurality of power storage elements 100 from both sides in the arrangement direction (Y-axis direction) of the plurality of power storage elements 100. A flat block-shaped end plate (holding member) to be held. The end member 400 is a conductive member formed of a conductive material such as steel, stainless steel, or aluminum from the viewpoint of strength or the like. The end member 400 may be subjected to insulation treatment. A detailed description of the configuration of the end member 400 will be described later.

  The side plate 700 is a long and flat restraining member (restraining bar) that is attached to the end member 400 at both ends and restrains the plurality of power storage elements 100. That is, the side plate 700 is disposed so as to extend in the Y-axis direction so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200 and 300, and the side plate 700 is arranged with respect to the plurality of power storage elements 100 and the plurality of spacers 200 and 300. The restraining force in the arrangement direction (Y-axis direction) is applied. In the present embodiment, two side plates 700 are arranged on both sides of the plurality of power storage elements 100 in the X-axis direction so as to sandwich the insulator 600 with the power storage element 100. Each of the two side plates 700 is attached to the X-axis direction ends of the two end members 400 at both ends in the Y-axis direction. Accordingly, the two side plates 700 sandwich and restrain the plurality of power storage elements 100 and the plurality of spacers 200 and 300 from both sides in the X-axis direction and both sides in the Y-axis direction.

  The side plate 700 is fixed to the end member 400 by a plurality of bolts 701 arranged in the Z-axis direction. In the present embodiment, the bolt 701 passes through the side plate 700 and is joined to the end member 400. Note that the attachment of the side plate 700 to the end member 400 is not limited to fixing with the bolt 701, and may be joined by welding, adhesion, or the like. Further, like the end member 400, the side plate 700 is a conductive member formed of a metal (conductive) member such as steel, stainless steel, or aluminum from the viewpoint of strength or the like. It may be formed of an insulating member, or may be subjected to insulation treatment.

  The insulator 600 is a long and flat insulating member that is disposed on both sides of the plurality of power storage elements 100 in the X-axis direction and extends in the Y-axis direction. That is, the insulator 600 is disposed between the plurality of power storage elements 100 and the plurality of spacers 200 and 300 and the side plate 700 so as to straddle the plurality of power storage elements 100 and the plurality of spacers 200 and 300. And the side plate 700 are insulated. The insulator 600 is, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyethylene terephthalate (PET), polyether ether ketone (PEEK), tetrafluoroethylene / perfluoroalkyl. It is made of an insulating material such as vinyl ether (PFA), polytetrafluoroethylene (PTFE), polybutylene terephthalate (PBT), poly ether sulfone (PES), ABS resin, ceramic, and composite materials thereof. . The insulator 600 may be formed of any material as long as it is an insulating member, and the two insulators 600 may be formed of members of different materials.

  The insulator 600 also has a function of pressing the plurality of power storage elements 100 in the negative Z-axis direction. In other words, the plurality of power storage elements 100 are configured to be mounted on a cooling device (not shown) and cooled, and the insulator 600 presses the plurality of power storage elements 100 toward the cooling device. The cooling device is a device that cools the power storage device 10 (a plurality of power storage elements 100) by, for example, water cooling. Note that the power storage device 10 may have a configuration that is not mounted on the cooling device, for example, on a vehicle body in which the power storage device 10 is mounted, or an exterior body that houses the power storage device 10. In this case, the insulator 600 may be configured to press the plurality of power storage elements 100 toward the vehicle body or the exterior body.

  The bus bar 800 is a conductive plate-like member that is disposed on the plurality of power storage elements 100 and electrically connects the electrode terminals of the plurality of power storage elements 100. In the present embodiment, bus bar 800 connects a plurality of power storage elements 100 in series by sequentially connecting a positive electrode terminal and a negative electrode terminal of adjacent power storage elements 100. Also, positive and negative external terminals 810 are connected to the bus bar 800 disposed at the end. The bus bar 800 is formed of a conductive member made of metal such as copper, copper alloy, aluminum, aluminum alloy, for example. Note that the connection form of the power storage elements 100 is not particularly limited, and any one of the power storage elements 100 may be connected in parallel.

  The bus bar holding member 900 is a plate that holds the bus bar 800 and other wirings (not shown), can insulate the bus bar 800 and the like from other members, and can regulate the position of the bus bar 800 and the like. Shaped member (bus bar plate, bus bar frame). Specifically, the bus bar holding member 900 has a main body portion and a lid portion, and after opening the lid portion and placing the bus bar 800 or the like on the main body portion, the bus bar holding member 900 is closed to close the bus bar. It is configured to accommodate 800 or the like. Bus bar holding member 900 is arranged above a plurality of power storage elements 100, that is, on the electrode terminal side of the plurality of power storage elements 100. The bus bar holding member 900 is formed of an insulating material such as PC, PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, ABS resin, ceramic, and a composite material thereof. A detailed description of the configuration of the bus bar holding member 900 will be described later.

  The terminal block 850 includes an external terminal 810 and is an insulating fixing member fixed on the end member 400. The terminal block 850 is provided for each of the plurality of end members 400. The terminal block 850 is a member that performs insulation between the external terminal 810 and other members and restricts the position of the external terminal 810. The terminal block 850 is formed of an insulating material such as PC, PP, PE, PPS, PET, PEEK, PFA, PTFE, PBT, PES, ABS resin, ceramic, and a composite material thereof. Note that the terminal block 850 is preferably formed to be harder than the spacer 300. In this case, for example, the terminal block 850 can be formed hard by including glass fiber in the insulating material described above. The glass fiber content is, for example, 30%. A detailed description of the configuration of the terminal block 850 will be described later.

[2 Detailed description of end member]
Next, the configuration of the end member 400 will be described in detail. FIG. 3 is a perspective view showing a positional relationship among the end member 400, the terminal block 850, and the bus bar holding member 900 according to the present embodiment. FIG. 4 is a perspective view showing the configuration of the end member 400 according to the present embodiment. Note that one end member 400 is provided on each of the positive electrode side and the negative electrode side of the power storage device 100, but both have substantially the same shape. For this reason, in the present embodiment, the end member 400 on the positive electrode side (Y-axis direction minus side) will be described, and the description on the end member 400 on the negative electrode side will be omitted.

  As shown in FIGS. 3 and 4, the end member 400 is formed in a substantially rectangular parallelepiped block shape. Specifically, the end member 400 is formed by a processing method such as extrusion or cutting. Here, the “block shape” means a three-dimensional shape with an overall uniform width. When a rectangular parallelepiped shape is illustrated as a block shape, the smallest one of width, thickness, and height may be 1/10 or more of the largest one. The end member 400 has a length (width) in the X-axis direction, a length (thickness) in the Y-axis direction, and a length (height) in the Z-axis direction as a whole. Further, the length in the X-axis direction of the end member 400 is preferably larger than the length of the external terminal 810 in the X-axis direction. The length of the end member 400 in the Y-axis direction is preferably larger than the length of the external terminal 810 in the Y-axis direction. A plurality of through holes 401 and 402 are formed on the upper surface of the end member 400 (the surface on the positive side in the Z-axis direction). The end member 400 is reduced in weight by the through holes 401 and 402. Here, the upper surface of the end member 400 is a surface on the same side as the surface (upper surface) on which the electrode terminal of the electricity storage element 100 is provided.

  A pair of through holes 401 provided at both ends in the X-axis direction on the upper surface of the end member 400 are formed in a cylindrical shape. The other four through holes 402 are arranged along the X-axis direction. These four through holes 402 are formed in a shape suitable for positioning the terminal block 850. A plurality (three in the present embodiment) of screw holes 403 for fixing the terminal block 850 are formed on the upper surface of the end member 400. Of the three screw holes 403, one screw hole 403 is disposed at the center in the X-axis direction, and the remaining two screw holes 403 are disposed at both ends in the X-axis direction. In the present embodiment, as shown in FIG. 3, since the terminal block 850 is disposed at a position closer to the X axis direction plus side in the end member 400, among the four other through holes 402 in the end member 400. The terminal block 850 is positioned with respect to the two through holes 402 on the X axis direction plus side. Of the three screw holes 403, the terminal block 850 is screwed to the two screw holes 403 on the positive side in the X-axis direction with screws (not shown).

  A plurality of screw holes 420 into which the bolts 701 are screwed are formed on the surface of the end member 400 on the Y axis direction minus side. The plurality of screw holes 420 are arranged along the Z-axis direction at both ends in the X-axis direction.

[3 Detailed explanation of terminal block]
Next, the configuration of the terminal block 850 will be described in detail. FIG. 5 is a perspective view showing the configuration of the terminal block 850 according to the present embodiment. FIG. 6 is a perspective view showing the configuration of terminal block 850 according to the present embodiment, and is a perspective view seen from a direction different from FIG. FIG. 7 is a bottom view showing the configuration of the terminal block 850 according to the present embodiment. FIG. 8 is a cross-sectional view showing the positional relationship between the terminal block 850 and the surrounding members according to the present embodiment. 8 is a cross-sectional view of the YZ cut plane including the line VIII-VIII in FIG.

  As shown in FIGS. 3 and 5 to 8, the terminal block 850 includes a plate-shaped external terminal 810 and a fixture 820 for fixing an external electric wire (not shown) connected to the external terminal 810. And. The terminal block 850 and the external terminal 810 are integrally formed by insert molding, for example. The fixture 820 may be insert-molded together with the terminal block 850 and the external terminal 810, or may be attached later to the external terminal 810 after the insert molding. The bus bar 800 is joined to the external terminal 810 by laser welding, for example.

  The terminal block 850 is integrally provided with a main body portion 860 and a locked portion 880.

  The main body 860 is a part that supports the external terminal 810 and the fixture 820, and is formed in a substantially rectangular shape that is long in the X-axis direction when viewed in the Z-axis direction. The lower surface of the main body 860 is a facing surface 866 that faces the end member 400. In addition, a first wall portion 861 is provided on the periphery of the upper surface of the main body portion 860. A portion of the first wall portion 861 on the minus side in the Y-axis direction is notched, and an external electric wire connected to the external terminal 810 is disposed in the notched portion 862. Attachment portions 863 for attaching the terminal block 850 to the end member 400 are provided at both ends of the notch portion 862 in the X-axis direction.

  The attachment portion 863 is a portion having a through hole 864 that penetrates in the Z-axis direction, and is surrounded by a surrounding wall 865 including a part of the first wall portion 861. The through-hole 864 is provided with a cylindrical collar (not shown) serving as a spacer, and a screw (not shown) is inserted through this collar. The terminal block 850 is fixed to the end member 400 by fastening the screw inserted through the through hole 864 into the screw hole 403 of the end member 400.

  As shown in FIGS. 6 to 8, the opposing surface 866 of the main body 860 is provided with a first convex portion 871, a second convex portion 872, a third convex portion 873, and a fourth convex portion 874. The first convex portion 871, the second convex portion 872, the third convex portion 873, and the fourth convex portion 874 protrude from the facing surface 866 toward the end member 400.

  The first convex portion 871 is a cylindrical convex portion surrounding the entire circumference of the through hole 864. The first convex portion 871 is supported in contact with the upper surface of the end member 400 when the terminal block 850 is fixed to the end member 400. That is, after fixing, the opposing surface 866 of the main body 860 and the upper surface of the end member 400 are separated from each other.

  Further, in FIG. 7, the external shape of the external terminal 810 is illustrated by a broken line. The normal direction of the external terminal 810 is parallel to the Z-axis direction. The normal direction of the external terminal 810 is the same as the normal direction of the facing surface 866. For this reason, as shown in FIG. 7, the two first convex portions 871 are arranged at positions that do not overlap the external terminal 810 in the normal direction view of the external terminal 810. Specifically, a pair of corners on the negative side in the Y-axis direction of the external terminal 810 is recessed toward the inside of the external terminal 810. By disposing the first convex portion 871 in the region formed by this depression, the first convex portion 871 and the external terminal 810 do not overlap in the normal direction view of the external terminal 810. Thus, since the 1st convex part 871 is arrange | positioned in the hollow in the outer edge of the external terminal 810, the external terminal 810 and the 1st convex part 871 can be arrange | positioned compactly, without overlapping.

  As shown in FIGS. 6 to 8, the second convex portion 872 is provided on a part of the peripheral edge of the facing surface 866 of the main body portion 860. The second convex portion 872 extends along the X-axis direction with respect to the Y-axis direction negative side edge of the main body portion 860. One end of the second convex portion 872 overlaps the first convex portion 871 on the minus side in the X-axis direction when viewed in the Y-axis direction. On the other hand, the other end of the second convex portion 872 overlaps the first convex portion 871 on the positive side in the X-axis direction when viewed in the Y-axis direction. As shown in FIG. 8, the outer surface of the second convex portion 872 is flush with the outer surface of the main body portion 860. Further, the inner side surface of the second convex portion 872 is an inclined surface that becomes outward (Y-axis direction minus side) as it goes downward (Z-axis direction minus side). A lower end portion of the second convex portion 872 is a plane parallel to the facing surface 866. As shown in FIG. 8, the protrusion amount H2 of the second convex portion 872 is lower than the protrusion amount H1 of the first convex portion 871. For this reason, in the Z-axis direction, the second convex portion 872 is located between the facing surface 866 and the end member 400.

  As shown in FIGS. 6 to 8, the third convex portion 873 is disposed on the positive side in the Y-axis direction with respect to the first convex portion 871 on the facing surface 866 of the main body portion 860. That is, the third convex portion 873 is disposed closer to the storage element 100 than the first convex portion 871. The third convex portion 873 includes a main portion 873a along the X-axis direction, and a plurality of branch portions 873b branched from the main portion 873a and along the Y-axis direction. The intersection of the main portion 873a and the branch portion 873b protrudes from the other portions. The intersecting portion 873c is accommodated in the through hole 402 of the end member 400. The intersecting portion 873c has a tapered shape that becomes lower as it approaches the intersection. Due to such a shape, when the intersecting portion 873c is accommodated in the through hole 402, it contacts the periphery of the through hole 402 and is guided to a predetermined position. Further, the portion other than the intersecting portion 873 c in the third convex portion 873 is a supported portion 873 d that is supported by being in contact with the upper surface of the end member 400. The protrusion amount H31 of the supported portion 873d is the same as the protrusion amount H1 of the first convex portion 871. Further, the protruding amount H32 of the intersecting portion 873c is larger than the protruding amount H31 of the supported portion 873d.

  The fourth convex portion 874 is disposed between the two first convex portions 871 on the facing surface 866 of the main body portion 860. Four fourth convex portions 874 are provided, and these are arranged in a cross shape. The protrusion amount H4 of the fourth protrusion 874 is smaller than the protrusion amount H1 of the first protrusion 871. Thereby, the 4th convex part 874 is spaced apart from the upper surface of the end member 400, and has opened the predetermined space | interval.

  Here, when the terminal block 850 is attached to the end member 400, a screw (not shown) is inserted into the through hole 864 of the terminal block 850 and fastened to the screw hole 403 of the end member 400. The base 850 may be bent. Assuming a case where there is no fourth convex portion 874, there is a possibility that stable fixation may be hindered by bending of the terminal block 850. However, if there is the fourth convex portion 874, the distance between the fourth convex portion 874 and the end member 400 decreases due to the bending of the terminal block 850, and the fourth convex portion 874 comes into contact with the end member 400. For this reason, the stability of the terminal block 850 is increased, and stable fixation is possible.

  Next, the creepage distance of the terminal block 850 will be described.

  FIG. 9 is a cross-sectional view showing the creepage distance of terminal block 850 according to the present embodiment. FIG. 9 is an enlarged view of the broken line portion D in FIG. A creeping distance is formed between the external terminal 810 and the end member 400 along the surface of the terminal block 850. In FIG. 9, the arrow Y <b> 1 schematically shows the creeping distance of the terminal block 850. It can be seen that the creepage distance Y1 passes through the surfaces of the second convex portion 872 and the first convex portion 871 and reaches the end member 400.

  FIG. 10 is a cross-sectional view showing the creeping distance of the terminal block 850A according to the comparative example. FIG. 10 corresponds to FIG. The terminal block 850A according to this comparative example is different from the terminal block 850 according to the present embodiment in that the opposed surface 866a does not have a convex portion and is a plane as a whole. The facing surface 866a of the terminal block 850A is in close contact with the upper surface of the end member 400. In FIG. 10, the arrow Y2 schematically shows the creepage distance of the terminal block 850A according to the comparative example. In FIG. 10, the creepage distance Y1 of the terminal block 850 according to the present embodiment is indicated by a broken line. Since the convex portion is not provided on the facing surface 866a of the terminal block 850A according to the comparative example, the creeping distance Y2 is shorter than the creeping distance Y1. That is, the terminal block 850 according to the present embodiment can increase the creeping distance Y1 because the first convex portion 871 and the second convex portion 872 are provided on the opposing surface 866.

  FIG. 11 is a cross-sectional view showing the creeping distance of a terminal block 850B according to a modification. FIG. 11 is a diagram corresponding to FIG. The terminal block 850B according to this modification is different from the terminal block 850 according to the present embodiment in that the second protrusion is not provided on the facing surface 866b. In FIG. 11, the arrow Y3 schematically indicates the creepage distance of the terminal block 850B according to the modification. In FIG. 11, the creepage distance Y1 of the terminal block 850 according to the present embodiment is indicated by a broken line, and the creepage distance Y2 of the terminal block 850A according to the comparative example is indicated by a two-dot chain line. Since the second convex portion is not provided on the facing surface 866b of the terminal block 850B according to the modification, the creeping distance Y3 is shorter than the creeping distance Y1. However, the opposing surface 866b of the terminal block 850B is provided with the first convex portion 871b. Since the creepage distance Y3 passes through the surface of the first convex portion 871b, the creepage distance Y3 is longer than the creepage distance Y2. can do.

  Also, two two-dot chain lines parallel to the X-axis direction shown in FIG. 7 indicate the Y-axis direction plus side edge of the end member 400 and the Y-axis direction minus side edge. As shown in FIG. 7, the first convex portion 871, the third convex portion 873, and the fourth convex portion 874 are disposed entirely inside the end member 400 in the normal direction view of the external terminal 810. The entire second convex portion 872 is disposed outside the end member 400. Since the entire first convex portion 871 is disposed inward of the end member 400, the creepage distance due to the first convex portion 871 can be further increased. The same applies to the third convex portion 873.

  In the present embodiment, the case where the number of installed first convex portions 871 is two is illustrated, but the number of installed first convex portions 871 is one or three or more. Also good.

  As shown in FIGS. 5 to 7, the locked portion 880 protrudes from the end of the main body 860 on the minus side in the X-axis direction toward the minus side in the X-axis direction. The locked portion 880 is a portion where the locking portion 920 that is a part of the bus bar holding member 900 is locked. Specifically, the locked portion 880 includes a top plate portion 881 and a second wall portion 882 provided on the periphery of the top plate portion 881.

  The top plate portion 881 is provided at the upper end portion (end portion on the plus side in the Z-axis direction) of the locked portion 880, and is formed in a rectangular plate shape parallel to the XY plane. An opening 883 having a rectangular shape in plan view penetrating in the Z-axis direction is formed at the center of the locked portion 880. An insertion portion 930 (described later) of the locking portion 920 is inserted into the opening 883 so that the locking portion 920 is locked to the locked portion 880.

  The second wall portion 882 is erected downward from the periphery of the lower surface (the surface on the minus side in the Z-axis direction) of the top plate portion 881. The second wall portion 882 is provided with respect to the entire circumference of the top plate portion 881. A first slit 884 extending in the Z-axis direction and opened downward is provided in the second wall portion 882 on the negative wall side in the X-axis direction. In addition, a second slit 885 extending in the Z-axis direction and opened downward is provided in a wall portion on the negative side in the Y-axis direction of the second wall portion 882. The first slit 884 and the second slit 885 are used when the locking portion 920 is removed from the locked portion 880.

[4 Detailed Description of Locking Section 920]
Next, the structure of the latching | locking part 920 with which the bus-bar holding member 900 is equipped is demonstrated in detail. FIG. 12 is a perspective view showing the configuration of the locking portion 920 according to the present embodiment. FIG. 13 is a perspective view showing the configuration of the locking portion 920 according to the present embodiment, and is a perspective view seen from a direction different from FIG. FIG. 14 is a front view showing the configuration of the locking portion 920 according to the present embodiment. FIG. 15 is a side view showing the configuration of the locking portion 920 according to the present embodiment. 14 and 15, a broken line and a two-dot chain line indicate the locked portion 880 assembled to the locking portion 920. Specifically, the broken line indicates the outer shape of the locked portion 880, and the two-dot chain line indicates the internal structure of the locked portion 880.

  As shown in FIGS. 3 and 12 to 15, the locking portion 920 is disposed at a position corresponding to the locked portion 880 in the bus bar holding member 900. Specifically, the locking portion 920 is an end portion on the Y axis direction minus side and protrudes from a substantially center in the X axis direction toward the Y axis direction minus side.

  The locking part 920 is provided with a wiring support part 940 that supports the wiring group 910 drawn from the bus bar holding member 900 and an insertion part 930 that is inserted into the opening 883 of the locked part 880.

  The wiring support portion 940 includes a flat pedestal portion 941, a pair of ribs 942, and a tongue portion 943. The pedestal portion 941 is formed in a rectangular shape in plan view. The pedestal portion 941 is flush with the inner bottom surface of the bus bar holding member 900 through an opening 901 provided in the wall portion of the bus bar holding member 900. The wiring group 910 drawn out from the inside of the bus bar holding member 900 through the opening 901 is placed on the upper surface of the pedestal portion 941, so that the wiring group 910 is supported by the pedestal portion 941. Further, the insertion portion 930 protrudes downward from the lower surface of the pedestal portion 941.

  The pair of ribs 942 is provided at both ends of the pedestal portion 941 in the X-axis direction. The pair of ribs 942 is positioned on the side of the wiring group 910 in a state where the wiring group 910 is supported on the pedestal portion 941. The rib 942 has a lower end portion located below the pedestal portion 941 and an upper end portion located above the pedestal portion 941. The portion of the rib 942 below the pedestal portion 941 is formed at a uniform height with respect to the pedestal portion 941. Further, the portion of the rib 942 above the pedestal portion 941 has an inclined surface that approaches the wall portion of the bus bar holding member 900 as it goes upward. That is, the rib 942 has the highest height at the base end portion of the pedestal portion 941 and is joined to the wall portion of the bus bar holding member 900. The pair of ribs 942 increases the strength of the locking portion 920. In this embodiment, the case where two ribs 942 are provided is illustrated, but it is sufficient that at least one rib is provided.

  The tongue 943 is a part to which the wiring group 910 is attached. The tongue portion 943 is elongated from the central portion in the X-axis direction toward the Y-axis direction minus side at the end portion on the Y-axis direction minus side of the pedestal portion 941. Thus, the tongue portion 943 protrudes outward from the pedestal portion 941. That is, the tongue portion 943 protrudes outward from the locking position with the locked portion 880 (position of the insertion portion 930). In addition, a pair of ridges 944 that are long in the Y-axis direction are provided on the lower surface of the tongue 943. The strength of the tongue 943 is enhanced by the pair of ridges 944.

  As shown in FIG. 3, in a state where the wiring group 910 is disposed on the upper surface of the pedestal portion 941 and the tongue portion 943, the tongue portion 943 and the wiring group 910 are bound by the binding band 999, so that the wiring group 910 is It is attached to the portion 943.

  As illustrated in FIGS. 12 to 15, the insertion portion 930 protrudes from the lower surface of the pedestal portion 941 toward the minus side in the Z-axis direction. The insertion portion 930 has a substantially rectangular cylindrical shape, and claw portions 931 that can be elastically deformed are provided on the wall portions on both sides in the X-axis direction. The upper end portion of the claw portion 931 protrudes outward, and the surface of the upper end portion is an inclined surface that becomes outward as it goes upward.

  When the locking portion 920 is locked to the locked portion 880 of the terminal block 850, the insertion portion 930 is inserted from above into the opening 883 of the top plate portion 881. At the time of insertion, since the inclined surface of the claw portion 931 comes into contact with the peripheral edge of the opening 883, the claw portion 931 is elastically deformed and gradually pushed into the insertion portion 930. After that, when the claw portion 931 passes through the opening 883, it is restored to its original shape. Thereby, the claw portion 931 is caught by the top plate portion 881, and the locking portion 920 is restricted and fixed to the locked portion 880.

  After the fixing, as shown in FIG. 14, the claw portion 931 on the plus side in the X-axis direction is exposed from the second slit 885 of the locked portion 880 as shown in FIG. 14. On the other hand, as shown in FIG. 15, of the pair of claw portions 931, the claw portion 931 on the minus side in the X-axis direction is exposed from the first slit 884 of the locked portion 880. When disassembling the terminal block 850 and the bus bar holding member 900, the operator inserts a tool into the first slit 884 and the second slit 885, and the pair of claw portions 931 are placed inside the insertion portion 930. The regulation is released by pushing toward and elastically deforming. After the release, the operator removes the locking portion 920 from the locked portion 880 by pulling the insertion portion 930 upward. Thereby, the terminal block 850 and the bus bar holding member 900 are disassembled.

[5 Description of effects]
As described above, according to power storage device 10 according to the present embodiment, a plurality of power storage elements 100, end member 400 disposed on the side of the plurality of power storage elements 100, and fixed on end member 400 A terminal block 850 (fixing member) and a bus bar holding member 900 disposed on the electrode terminal side of the plurality of power storage elements 100, and a bus bar holding member that holds a bus bar 800 that connects the electrode terminals of the plurality of power storage elements 100 to each other. 900, and the terminal block 850 includes a locked portion 880 to which a part (the locking portion 920) of the bus bar holding member 900 is locked.

  According to this configuration, since the locked portion 880 to which the locking portion 920 of the bus bar holding member 900 is locked is provided on the terminal block 850 fixed to the end member 400, the bus bar holding member 900 is directly connected. The degree of freedom of the shape of the end member 400 can be increased as compared with the case where the end member 400 is locked. For this reason, it is possible to employ | adopt the end member 400 formed, for example by extrusion molding. Since the end member 400 formed by extrusion molding has higher rigidity than the end member 400 formed of conventional sheet metal, even if the plurality of power storage elements 100 expand, these end members 400 are stably paired with the end members 400. It can be sandwiched between the members 400. For this reason, the pressure | voltage resistance with respect to the internal pressure increase at the time of EOL can be improved, for example.

  Further, since the terminal block 850 is fixed on the end member 400, the terminal block 850 overlaps the end member 400 in the Y-axis direction when viewed from above. Thereby, the enlargement in the Y-axis direction can be suppressed.

  The fixing member is a terminal block 850 including an external terminal 810 connected to at least one of the plurality of power storage elements 100.

  According to this configuration, since the fixing member is the terminal block 850, these can be shared by one member. Therefore, an increase in size of power storage device 10 in the Y-axis direction can be suppressed. The terminal block 850 is generally made of a material harder than the spacer 300 disposed between the power storage element 100 and the end member 400. Therefore, compared with the case where the locked portion is provided for the spacer 300, the locked state with the bus bar holding member 900 is more stable when the locked portion 880 is provided on the terminal block 850. Can do. If the locked state is stabilized, the pressure resistance of the power storage device 10 itself can be further increased.

In addition, a part of the bus bar holding member 900 (the locking part 920) is provided with the wiring support part 940 that supports the wiring (wiring group 910) drawn from the bus bar holding member 900. The locking portion 920 of the holding member 900 is a locking position between the bus bar holding member 900 and the terminal block 850. Even if the bus bar holding member 900 and the terminal block 850 are misaligned, the misalignment amount is slight at the locking position. In other words, if the wiring support portion 940 that supports the wiring group 910 is provided in the locking portion 920 of the bus bar holding member 900 that is the locking position, the wiring group 910 can be stably supported, and the power storage device 10, the load on the wiring group 910 due to high pressure inside, vibration, or the like can be suppressed.

  In addition, the wiring support portion 940 is provided with ribs 942 arranged on the sides of the wiring (wiring group 910).

  According to this configuration, since the rib 942 is provided on the side of the wiring group 910, the wiring group 910 is guided by the rib 942. Further, the wiring support portion 940 is reinforced by the presence of the rib 942. As a result, the wiring group 910 can be supported more stably, and the load on the wiring group 910 caused by high voltage, vibration, or the like inside the power storage device 10 can be further suppressed.

  In addition, the wiring support portion 940 protrudes outward from the locking position with the locked portion 880 in a part (the locking portion 920) of the bus bar holding member 900, and the tongue to which the wiring (wiring group 910) is attached. A portion 943 is provided.

  According to this, since the wiring group 910 is attached to the tongue portion 943 protruding outward from the locking position with the locked portion 880, the locking portion 920 and the locked portion 880 of the bus bar holding member 900 The wiring group 910 can be attached to the tongue portion 943 in a state where the locking is maintained. Therefore, the wiring group 910 can be supported more stably, and a load on the wiring group 910 due to high voltage, vibration, or the like inside the power storage device 10 can be further suppressed.

[6 Description of Modification]
The power storage device 10 according to the present embodiment has been described above, but the present invention is not limited to the above embodiment. That is, the embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the above-described embodiment, the case where the fixing member including the locked portion 880 is the terminal block 850 is illustrated, but the fixing member including the locked portion may be separate from the terminal block.

  Moreover, in the said embodiment, although the case where the terminal block 850 was installed on the upper surface of the end member 400 was illustrated, the terminal block may be installed on the side surface of an end member.

  Moreover, although the case where the wiring support part 940 was provided in the latching | locking part 920 of the bus-bar holding member 900 was illustrated in the said embodiment, the wiring support part does not need to be provided in the latching | locking part.

  In addition, embodiments constructed by arbitrarily combining the constituent elements included in the above-described embodiment and its modifications are also included in the scope of the present invention.

  The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

DESCRIPTION OF SYMBOLS 10 Power storage device 100 Power storage element 200, 300 Spacer 400 End member 401, 402 Through hole 403, 420 Screw hole 510, 520, 530 Joining member 600 Insulator 700 Side plate 701 Bolt 800 Bus bar 810 External terminal 820 Fixing tool 850, 850A, 850B Terminal block 860 Main body portion 861 First wall portion 862 Notch portion 863 Mounting portion 864 Through hole 865 Enclosure walls 866, 866a, 866b Opposing surfaces 871, 871b First convex portion 872 Second convex portion 873 Third convex portion 873a Main portion 873b Branch portion 873c Crossing portion 873d Supported portion 874 Fourth convex portion 880 Locked portion 881 Top plate portion 882 Second wall portion 883 Opening portion 884 First slit 885 Second slit 900 Busbar holding member 901 Opening 910 Wiring group 920 Locking part 93 Insertion unit 931 pawl portion 940 wiring supporting portion 941 base portion 942 rib 943 tongue 944 ridge 999 binding band D broken lines H1, H2, H31, H32, H4 projection amount Y1, Y2, Y3 creepage distance

Claims (5)

A plurality of power storage elements;
End members disposed on the sides of the plurality of power storage elements;
A fixing member fixed on the end member;
A bus bar holding member disposed on the electrode terminal side of the plurality of power storage elements, the bus bar holding member holding a bus bar connecting the electrode terminals of the plurality of power storage elements, and
The fixing member includes a locked portion to which a part of the bus bar holding member is locked. The power storage device according to claim 1, wherein the fixing member is a terminal block including a terminal connected to at least one of the plurality of power storage elements. The power storage device according to claim 1, wherein a wiring support portion that supports a wiring drawn from the bus bar holding member is provided in the part of the bus bar holding member. The power storage device according to claim 3, wherein the wiring support portion is provided with a rib disposed on a side of the wiring. The wiring support portion is provided with a tongue portion that protrudes outward from a locking position of the part of the bus bar holding member with the locked portion and to which the wiring is attached. The power storage device described in 1.

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