JP2012028050A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that a bus bar needs to be stored so as to prevent the bus bar from being lost and so on when the bus bar is detached from a storage element.SOLUTION: A power storage device includes a plurality of storage elements (10) having a positive electrode terminal (13) and a negative electrode terminal (14) on an upper surface, cases (101, 102) for housing the plurality of storage elements, a plurality of bus bars (20) coming into contact with the positive electrode terminals and the negative electrode terminals of the respective storage elements to electrically connect the plurality of storage elements, and a support unit (30) which extends upward from a bottom surface (101) of the case to support the respective bus bars while penetrating through the respective bus bars.

Description

  The present invention relates to a power storage device that houses a plurality of power storage elements inside a case.

  The battery pack includes an assembled battery and a case that houses the assembled battery. The assembled battery is composed of a plurality of unit cells, and the plurality of unit cells are electrically connected by a plurality of bus bars.

JP 2002-157982 A JP 2010-033393 A JP 09-213292 A JP 2002-157984 A JP 2009-087761 A JP 2009-048773 A JP 2008-181765 A JP 2006-324060 A JP-A-11-102680

  When replacing one of the battery packs, for example, a battery having deteriorated, it is necessary to remove the bus bar. When the bus bar is removed from the unit cell, it is necessary to store the bus bar so that the bus bar is not lost or damaged.

  A power storage device according to the present invention includes a plurality of power storage elements having a positive electrode terminal and a negative electrode terminal on an upper surface, a case that houses the plurality of power storage elements, a positive electrode terminal and a negative electrode terminal of each power storage element, and a plurality of power storage elements And a support unit that extends upward from the bottom surface of the case and supports each bus bar in a state of passing through each bus bar.

  Here, if a case is comprised using the upper case and lower case which are mutually connected, a support unit can be fixed to a lower case. If the support unit is fixed to the lower case, the state of the bus bar supported by the support unit can be confirmed before the upper case is connected to the lower case.

  If the support unit presses the bus bar downward, the bus bar can be brought into contact with the positive terminal and the negative terminal. Moreover, the positive electrode terminal and the negative electrode terminal can be provided with a tapered surface whose diameter decreases from the proximal end side toward the distal end side. And the contact part which contacts a positive electrode terminal and a negative electrode terminal among bus bars can be formed in the shape along a taper surface. If comprised in this way, a bus bar can be made to contact a positive electrode terminal and a negative electrode terminal only by pressing down a bus bar, and the contact area of a bus bar and a positive electrode terminal (and negative electrode terminal) can be ensured.

  The support unit can be disposed between two adjacent power storage elements. Here, the bus bar can be moved along the longitudinal direction of the support unit and can be rotated around an axis along the longitudinal direction of the support unit. Accordingly, the bus bar can be detached from the positive terminal and the negative terminal or connected to the positive terminal and the negative terminal while the bus bar is supported by the support unit.

  A stopper for holding the bus bar at a position away from the bottom surface of the case can be provided on the support unit. Thereby, the bus bar can be held at a position close to the positive electrode terminal and the negative electrode terminal, and the bus bar can be easily attached to the positive electrode terminal and the negative electrode terminal.

  A plurality of bus bars can be configured as a bus bar module. Specifically, the bus bar module can be composed of a plurality of bus bars and a holding member that holds the plurality of bus bars and is formed of an insulating material. Moreover, the bending part which can change the positional relationship of the two contact parts which contact a positive electrode terminal and a negative electrode terminal with respect to a bus bar can be provided. Even if the positive electrode terminal and the negative electrode terminal are displaced from the reference position, the bus bar can be easily attached to the positive electrode terminal and the negative electrode terminal by deforming the bent portion.

  The support unit can be composed of a bolt that penetrates the bottom surface of the bus bar and the case, and a nut that meshes with a portion of the bolt that protrudes from the bottom surface of the case. Here, it is preferable to dispose an insulating member between the bolt and the bus bar.

  According to the present invention, since the support unit supports the bus bar while penetrating the bus bar, the bus bar can be left on the support unit (in other words, the bottom surface of the case). Thereby, storage of the bus bar is facilitated, and loss of the bus bar can be prevented.

It is the schematic which shows the structure of the battery pack which is Example 1 of this invention. 1 is a front view of a single cell in Example 1. FIG. 1 is a side view of a single cell in Example 1. FIG. 3 is a top view of a unit cell in Example 1. FIG. 3 is a side view of a bus bar in Embodiment 1. FIG. 3 is a bottom view of a bus bar in Embodiment 1. FIG. In Example 1, it is a side view which shows the structure of a part of battery pack. In Example 1, it is a top view which shows the structure of a part of battery pack. In Example 2 of this invention, it is a side view which shows the structure of a part of battery pack. In Example 2, it is a top view which shows the structure of a part of battery pack. In Example 2, it is a side view which shows the structure of a part of battery pack, Comprising: It is a figure which shows the state which removed the bus-bar from the electrode terminal. In Example 2, it is a top view which shows the structure of a part of battery pack, Comprising: It is a figure which shows the state which removed the bus-bar from the electrode terminal. It is a top view of the bus-bar module in Example 3 of this invention. FIG. 6 is an enlarged view showing a part of a bus bar module in Example 3. FIG. 6 is a cross-sectional view showing a part of a bus bar module in Example 3. 10 is a top view of a bus bar in a modification of Example 3. FIG. FIG. 10 is a side view of a bus bar in a modification of Example 3. In Example 4 of this invention, it is a side view which shows the structure of a part of battery pack.

  Examples of the present invention will be described below.

  A battery pack (corresponding to a power storage device) that is Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing a configuration of a battery pack. The X axis, the Y axis, and the Z axis shown in FIG. 1 are axes that are orthogonal to each other. In this embodiment, the axis corresponding to the vertical direction is the Z axis.

  The battery pack 1 includes an assembled battery 100 and a lower case 101 and an upper case 102 for housing the assembled battery 100. The lower case 101 and the upper case 102 form a space for accommodating the assembled battery 100 by being connected to each other.

  In this embodiment, the lower case 101 and the upper case 102 are formed in the shape shown in FIG. 1, but the present invention is not limited to this. That is, it is only necessary that a space for accommodating the assembled battery 100 can be formed by the upper case and the lower case. For example, the lower case may have a side wall that faces the side surface of the assembled battery 100, and the upper case may be configured only by a surface that faces the upper surface of the assembled battery 100.

  The assembled battery 100 includes a plurality of single cells (corresponding to power storage elements) 10. The plurality of unit cells 10 are arranged side by side in the X direction and are electrically connected in series. A plurality of single cells 10 electrically connected in parallel may be included. Also, a plurality of assembled batteries 100 shown in FIG. 1 may be prepared, and the plurality of assembled batteries 100 may be arranged in the Y direction.

  As the unit cell 10, a secondary battery such as a nickel metal hydride battery or a lithium ion battery can be used. In addition, an electric double layer capacitor can be used instead of the secondary battery. In this embodiment, the unit cells 10 are arranged in one direction. However, a plurality of unit cells 10 may be used to form a single battery module, and a plurality of battery modules may be arranged in one direction. it can. The plurality of single cells 10 included in one battery module are electrically connected in series.

  Next, a specific structure of the unit cell 10 will be described with reference to FIGS. 2A to 2C. FIG. 2A is a front view of the unit cell 10 as viewed from the X direction. 2B is a side view of the unit cell 10 when viewed from the direction of the arrow D1 in FIG. 2A, and FIG. 2C is a top view of the unit cell 10 when viewed from the direction of the arrow D2 in FIG. 2A.

  As shown in FIG. 2A, the cell 10 includes a power generation element 11 and a battery case 12 that houses the power generation element 11. The power generation element 11 is composed of a positive electrode element, a negative electrode element, and an electrolyte layer disposed between the positive electrode element and the negative electrode element, and is an element that charges and discharges. For example, the power generation element 11 can be configured by rolling a laminate in which a positive electrode element, an electrolyte layer, and a negative electrode element are stacked.

  A positive terminal (also referred to as an electrode terminal) 13 and a negative terminal (also referred to as an electrode terminal) 14 are disposed on the upper surface of the battery case 12. The positive terminal 13 is electrically and mechanically connected to the positive element of the power generation element 11. Moreover, the positive electrode terminal 13 has a diameter that continuously decreases from the proximal end portion toward the distal end portion, and has a tapered surface 13a.

  The negative electrode terminal 14 is electrically and mechanically connected to the negative electrode element of the power generation element 11. Moreover, the negative electrode terminal 14 has a diameter that continuously decreases from the proximal end portion toward the distal end portion, and has a tapered surface 14a. In this embodiment, the tapered surfaces 13a and 14a are formed on the entire side surfaces of the electrode terminals 13 and 14, but the present invention is not limited to this. That is, a tapered surface may be formed on part of the side surfaces of the electrode terminals 13 and 14.

  Two unit cells 10 adjacent in the X direction are electrically connected by a bus bar 20 shown in FIGS. 3A and 3B. Here, FIG. 3A is a side view of the bus bar 20, and FIG. 3B is a bottom view of the bus bar 20 as viewed from the direction of the arrow D3 in FIG. 3A. The bus bar 20 is made of a conductive material, and forms a current path between two unit cells 10 that are electrically connected.

  The bus bar 20 has connection holes 21 and 22 (corresponding to contact portions), and the connection holes 21 and 22 are in contact with the electrode terminals 13 and 14 of the unit cell 10. The connection hole 21 is configured with a tapered surface along the tapered surfaces 13a and 14a of the electrode terminals 13 and 14, and the connection hole 22 is configured with a tapered surface along the tapered surfaces 13a and 14a of the electrode terminals 13 and 14. Has been. In the present embodiment, the connection holes 21 and 22 pass through the bus bar 20, but do not need to pass through the connection holes 21 and 22 as long as the electrode terminals 13 and 14 can be inserted.

  In the bus bar 20, a through hole 23 is formed between the two connection holes 21 and 22. The support unit 30 is inserted into the through hole 23 as shown in FIGS. 4A and 4B. Here, FIG. 4A is a side view showing a configuration of a part of the battery pack 1, and FIG. 4B is a view when seen from the direction of the arrow D4 in FIG. 4A. In FIG. 4A, the connection hole 21 of the bus bar 20 is in contact with the negative electrode terminal 14 and the connection hole 22 of the bus bar 20 is in contact with the positive electrode terminal 13.

  The support unit 30 includes a bolt 31 and a nut 32 that meshes with the bolt 31, and is disposed between two unit cells 10 adjacent in the X direction. The bolt 31 extends in the Z direction and passes through the through hole 23 of the bus bar 20 and the lower case 101. A collar 33 is disposed between the bolt 31 and the through hole 23 of the bus bar 20.

  The collar 33 is formed of an insulating material (for example, resin), and ensures insulation between the bolt 31 and the bus bar 20. The collar 33 is fixed to the bus bar 20 with an adhesive or the like. The collar 33 may not be fixed to the bus bar 20. In this embodiment, the insulating collar 33 is used, but the present invention is not limited to this. For example, the collar 33 can be omitted if an insulating layer is formed on the surface of the bus bar 20.

  The collar 33 has a cylindrical portion 33a and a flange portion 33b. The cylindrical portion 33 a extends in the Z direction along the bolt 31 and is inserted into the through hole 23 of the bus bar 20. The flange portion 33 b is in contact with the upper surface of the bus bar 20, and a washer 34 is disposed between the flange portion 33 b and the head portion 31 a of the bolt 31. The tip 31b of the bolt 31 protrudes to the outside of the lower case 101, and a nut 32 is attached. The lower case 101 is formed with a recess 101 a, and the recess 101 a forms a space for placing the nut 32.

  When the nut 32 is tightened with respect to the front end portion 31 b of the bolt 31, the head portion 31 a of the bolt 31 pushes the bus bar 20 downward via the washer 34 and the flange portion 33 b of the collar 33. Thereby, the connection holes 21 and 22 of the bus bar 20 can be brought into close contact with the electrode terminals 13 and 14, and electrical connection between the bus bar 20 and the electrode terminals 13 and 14 can be ensured.

  In the present embodiment, the contact areas of the electrode terminals 13 and 14 and the bus bar 20 can be ensured by bringing the connection holes 21 and 22 of the bus bar 20 into contact with the tapered surfaces 13a and 14a of the electrode terminals 13 and 14, respectively.

  Further, by pushing the bus bar 20 downward, the unit cell 10 can be held by the bus bar 20 and the lower case 101. In other words, the unit cell 10 can be fixed to the lower case 101. Thus, according to the present embodiment, by using the support unit 30, the unit cell 10 can be fixed to the lower case 101 by fixing the bus bar 20 to the electrode terminals 13 and 14. Thereby, the assembly work of the battery pack 1 can be simplified.

  In this embodiment, when removing the bus bar 20 from the electrode terminals 13 and 14, first, the nut 32 that engages with the bolt 31 is loosened. When the nut 32 is loosened, the bolt 31 can be slid upward. By sliding the bolt 31 upward, the bus bar 20 can be moved upward, and the bus bar 20 can be removed from the electrode terminals 13 and 14.

  In a state where the bus bar 20 is removed from the electrode terminals 13 and 14, the bus bar 20 can be rotated around the bolt 31. Then, by rotating the bus bar 20, for example, the bus bar 20 can be arranged along the Y direction. If the bus bar 20 is arranged along the Y direction, the unit cell 10 can be prevented from interfering with the bus bar 20 when the unit cell 10 is replaced. Here, if the interval between two unit cells 10 adjacent in the X direction is set to be equal to or greater than the width of the bus bar 20 (the length in the Y direction in FIG. 4B), the unit cells 10 can be easily taken out in the Z direction. .

  In the present embodiment, the bolt 31 is arranged so that the head portion 31a of the bolt 31 is positioned above, but the present invention is not limited to this. Specifically, the head portion 31 a of the bolt 31 can be disposed in the space formed by the concave portion 101 a of the lower case 101. In this case, the tip portion 31b of the bolt 31 protrudes from the flange portion 33b of the collar 33, and the nut 32 may be attached to the tip portion 31b. Even if it is such a structure, the effect similar to a present Example can be acquired.

  In this embodiment, the nut 31 is used to fix the bolt 31 to the lower case 101. However, the present invention is not limited to this. For example, the shaft member corresponding to the bolt 31 and the lower case 101 can be integrally configured. Here, a nut is attached to the upper end portion of the shaft member, and the bus bar 20 can be pressed downward by tightening the nut.

  A battery pack that is Embodiment 2 of the present invention will be described. Here, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  In the present embodiment, the structure of the bolt 31 included in the support unit 30 is different from that in the first embodiment. Specifically, as shown in FIG. 5A, the bolt 31 has a stopper portion 31c formed in a convex shape. Here, FIG. 5A is a side view showing a part of the configuration of the battery pack 1 in the present embodiment, and FIG. 5B is a top view when seen from the direction of the arrow D5 in FIG. 5A.

  The stopper 31c of the bolt 31 is used to hold the bus bar 20 at a predetermined height. Hereinafter, the function of the stopper portion 31c will be specifically described. The position where the stopper 31c is provided for the bolt 31 can be set as appropriate.

  In the state shown in FIG. 5A, when the meshing position of the nut 32 with respect to the bolt 31 is changed downward, the bolt 31 can be moved upward. Accordingly, the bus bar 20 can also be moved upward, and the connection holes 21 and 22 of the bus bar 20 can be moved away from the electrode terminals 13 and 14. If the connection holes 21 and 22 are removed from the electrode terminals 13 and 14, the bus bar 20 can be rotated around the bolt 31. Specifically, the bus bar 20 can rotate around the through hole 23.

  When the bus bar 20 is rotated so that the longitudinal direction of the bus bar 20 extends from the X direction to the Y direction, the state shown in FIG. 6A is obtained. Here, FIG. 6A is a side view showing a part of the battery pack 1 after the bus bar 20 is removed from the electrode terminals 13 and 14, and FIG. 6B is an upper surface when viewed from the direction of the arrow D6 in FIG. 6A. FIG.

  As shown in FIG. 6A, the cylindrical portion 33 a of the collar 33 is in contact with the stopper portion 31 c of the bolt 31, and the stopper portion 31 c prevents the collar 33 from falling. In other words, if the stopper portion 31 c is omitted, the bus bar 20 and the collar 33 fall to a position where they come into contact with the lower case 101. As a result, the collar 33 is held at a predetermined height away from the lower case 101. Here, since the collar 33 is fixed to the bus bar 20 (through hole 23), the bus bar 20 is also held at a predetermined position.

  According to the present embodiment, the bus bar 20 can be easily attached to the electrode terminals 13 and 14 by holding the bus bar 20 at a predetermined position (height). Here, if the stop portion 31 is omitted, the collar 33 falls to a position where it comes into contact with the lower case 101. From this state, when the bus bar 20 is to be connected to the electrode terminals 13 and 14 again, the bus bar 20 must be moved to a height where the electrode terminals 13 and 14 are located.

  On the other hand, in this embodiment, since the bus bar 20 is held at a position above the lower case 101, the bus bar 20 can be easily moved to a height where the electrode terminals 13 and 14 are located. Thereby, the bus bar 20 can be easily connected to the electrode terminals 13 and 14. In addition, since the bus bar 20 remains attached to the bolt 31, the battery cell 10 can be easily replaced without losing the bus bar 20.

  In this embodiment, since the collar 33 is fixed to the bus bar 20 (through hole 23), the cylindrical portion 33a of the collar 33 is brought into contact with the stopper portion 31c, but this is not restrictive. For example, when the collar 33 is not fixed to the bus bar 20, the collar 33 and the bus bar 20 may be brought into contact with the stopper portion 31c. Thereby, the collar 33 and the bus bar 20 can be held at a predetermined height.

  A battery pack that is Embodiment 3 of the present invention will be described. Here, members having the same functions as those described in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the first embodiment will be mainly described.

  In the first embodiment, the plurality of bus bars 20 are independent from each other, but in the present embodiment, the plurality of bus bars 20 are integrally formed. FIG. 7 is a top view of the bus bar module used in this embodiment.

  The bus bar module 40 illustrated in FIG. 7 includes a plurality of bus bars 20 and a holding plate (corresponding to a holding member) 41 that holds the plurality of bus bars 20. The holding plate 41 is formed of an insulating material (for example, resin). In the example shown in FIG. 7, an assembled battery is configured by arranging a plurality of rows of unit cells 10 arranged side by side in the X direction in two rows in the Y direction. As described in the first embodiment, the present embodiment can also be applied to the assembled battery 100 in which the plurality of single cells 10 are arranged in the X direction.

  The holding plate 41 has openings 41 a and 41 b, and the openings 41 a and 41 b are provided to allow the electrode terminals 13 and 14 of the unit cell 10 to pass through. The electrode terminals 13 and 14 penetrating the openings 41a and 41b are connected to a load (not shown) via a cable.

  When the battery pack 1 of this embodiment is mounted on a vehicle, a motor / generator can be used as a load. The motor / generator generates kinetic energy for running the vehicle by receiving electric power from the battery pack 1, or converts the kinetic energy generated during braking of the vehicle into electric energy and supplies the electric energy to the battery pack 1. . An inverter and a converter can be arranged between the battery pack 1 and the motor / generator.

  As shown in FIGS. 8A and 8B, the holding plate 41 holds the bus bar 20 using the claw portion 41c. 8A is an enlarged view showing a part of the bus bar module 40, and FIG. 8B is a cross-sectional view taken along the line AA of FIG. 8A.

  The holding plate 41 is formed with an opening 41 d for accommodating the bus bar 20, and the opening 41 d is formed along the outer edge of the bus bar 20. A plurality of claw portions 41c are provided in a part of the opening 41d. Each of both ends in the longitudinal direction of the bus bar 20 is sandwiched between a pair of claw portions 41c as shown in FIG. 8B.

  In the present embodiment, the support units 30 described in the first embodiment are provided by the number of bus bars 20, and the bus bar modules 40 are supported by the plurality of support units 30.

  Also in this embodiment, the same effect as that of Embodiment 1 can be obtained. Specifically, the cell 10 can be fixed to the lower case 101 by fixing the bus bar 20 to the electrode terminals 13 and 14. In this embodiment, since the bus bar module 40 in which the plurality of bus bars 20 are integrally formed is used, the bus bar 20 can be easily attached to the plurality of single cells 10.

  In this embodiment, the bus bar 20 shown in FIGS. 9A and 9B can also be used. Here, FIG. 9A is a top view of a bus bar 20 which is a modified example of the present embodiment, and FIG. 9B is a side view of a bus bar which is a modified example. The bus bar 20 in this modification has a bent portion 24 between the connection hole 21 and the through hole 23, and has a bent portion 24 between the connection hole 22 and the through hole 23. As shown in FIG. 9B, the two bent portions 24 protrude in the same direction (upward direction in FIG. 9B).

  By providing the bent portion 24 on the bus bar 20, the bus bar 20 can be easily connected to the electrode terminals 13 and 14. When the bus bar module 40 in which the plurality of bus bars 20 are integrally formed is used, if some of the electrode terminals 13 and 14 are displaced from the reference position, it is difficult to attach the bus bar 20 to the electrode terminals 13 and 14. In this modification, the bus bar 20 can be easily attached to the electrode terminals 13 and 14 by deforming the bent portion 24 of the bus bar 20.

  For example, when the interval between the electrode terminals 13 and 14 is widened, the bent portion 24 can be deformed so that the connection holes 21 and 22 of the bus bar 20 are displaced in a direction away from each other (left and right direction in FIG. 9B). As a result, the connection holes 21 and 22 of the bus bar 20 can be aligned with the electrode terminals 13 and 14 with a wider space.

  In addition, in this modification, although the bending part 24 of the shape shown to FIG. 9A and FIG. 9B is used, it does not restrict to this. That is, it is only necessary that the bent portions 24 are deformed to change the positions of the connection holes 21 and 22. For example, in the present modification, two bent portions 24 are provided on the bus bar 20, but only one bent portion 24 may be provided.

  Moreover, in this modification, although the bending part 24 is provided in the bus-bar 20 used with the bus-bar module 40, it does not restrict to this. That is, as described in the first embodiment, in the configuration in which the plurality of bus bars 20 are provided independently, the bent portion 24 described in the present modification can be provided for each bus bar 20.

  A battery pack that is Embodiment 4 of the present invention will be described. Here, members having the same functions as those described in the first and second embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. Hereinafter, differences from the second embodiment will be mainly described.

  In the second embodiment, the bus bar 20 is pressed downward to bring the connection holes 21 and 22 of the bus bar 20 into contact with the electrode terminals 13 and 14, but in this embodiment, the bus bar 20 is connected to the electrode by using bolts. The terminals 13 and 14 are fixed.

  FIG. 10 is a side view showing a partial configuration of the battery pack in the present embodiment. As shown in FIG. 10, the positive terminal 13 is formed with a screw groove 13 b that engages with the screw portion 50 a of the bolt 50, and the negative electrode terminal 14 is formed with a screw groove 14 b that engages with the screw portion 50 a of the bolt 50. ing. The bus bar 20 is provided with a through hole 25 through which the threaded portion 50 a of the bolt 50 passes. The through hole 25 is provided corresponding to the electrode terminals 13 and 14.

  The bus bar 20 can be fixed to the upper surface of the positive electrode terminal 13 by the screw portion 50 a penetrating the through hole 25 of the bus bar 20 engaging with the screw groove 13 b of the positive electrode terminal 13. Thereby, the electrical connection of the bus bar 20 and the positive electrode terminal 13 can be ensured. In addition, the bus bar 20 can be fixed to the upper surface of the negative electrode terminal 14 by engaging the screw portion 50 a penetrating the through hole 25 with the screw groove 14 b of the negative electrode terminal 14. Thereby, the electrical connection of the bus bar 20 and the negative electrode terminal 14 can be ensured.

  In the present embodiment, similarly to the second embodiment, the unit cell 10 can be replaced by removing the bolt 50 and releasing the bus bar 20 from the electrode terminals 13 and 14. Here, when the cylindrical portion 33a of the collar 33 in the support unit 30 comes into contact with the stopper portion 31c, the bus bar 20 can be held at a predetermined height. In addition, after replacing the unit cell 10, the operator can easily move the bus bar 20 held at a predetermined height to a position where the bus bar 20 is fixed to the electrode terminals 13 and 14.

  According to the present embodiment, since the bus bar 20 is supported by the support unit 30 even while the unit cell 10 is replaced, it is possible to prevent the bus bar 20 from being lost.

1: Battery pack (power storage device) 100: Battery assembly 101: Lower case 102: Upper case 10: Single battery (power storage element) 11: Power generation element 12: Battery case 13: Positive electrode terminal (electrode terminal)
13a: Tapered surface 14: Negative electrode terminal (electrode terminal)
14a: Tapered surface 20: Bus bar 21, 22: Connection hole (contact part) 23: Through hole 30: Support unit 31: Bolt 31a: Head part 31b: Tip part 31c: Stopper part 32: Nut 33: Collar 33a: Cylindrical part 33b: Flange part 34: Washer 40: Bus bar module 41: Holding plate (holding member)
41a, 41b: opening 41c: claw part 41d: opening 50: bolt

Claims (9)

A plurality of power storage elements having a positive electrode terminal and a negative electrode terminal on the upper surface;
A case for accommodating the plurality of power storage elements;
A plurality of bus bars in contact with the positive electrode terminal and the negative electrode terminal of each of the power storage elements, and electrically connecting the plurality of power storage elements;
A support unit that extends upward from the bottom surface of the case and supports the bus bars in a state of passing through the bus bars;
A power storage device comprising: The case has an upper case and a lower case connected to each other,
The power storage device according to claim 1, wherein the support unit is fixed to the lower case.   The power storage device according to claim 1, wherein the support unit presses the bus bar downward to make contact with the positive terminal and the negative terminal. The positive electrode terminal and the negative electrode terminal have a tapered surface whose diameter decreases from the proximal end side toward the distal end side,
4. The power storage device according to claim 1, wherein the bus bar is formed in a shape along the tapered surface and has a contact portion that contacts the positive electrode terminal and the negative electrode terminal. 5. The support unit is disposed between two adjacent power storage elements,
5. The bus bar according to claim 1, wherein the bus bar is movable along a longitudinal direction of the support unit and is rotatable around an axis along the longitudinal direction of the support unit. The power storage device according to one.   The power storage device according to claim 1, wherein the support unit includes a stopper for holding the bus bar at a position away from the bottom surface of the case.   The power storage device according to claim 3, further comprising a bus bar module including the plurality of bus bars and a holding member that holds the plurality of bus bars and is formed of an insulating material. apparatus.   The power storage device according to any one of claims 1 to 7, wherein the bus bar has a bent portion that can change a positional relationship between two contact portions that are in contact with the positive electrode terminal and the negative electrode terminal. The support unit is
A bolt that penetrates the bottom of the bus bar and the case;
Of the bolt, a nut that meshes with a portion protruding from the bottom surface of the case,
The power storage device according to claim 1, comprising:

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