JP2018110082A - Holding member and battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding member capable of sufficiently holding a bus bar that is fastened by a rotating fastening member and electrically connecting different battery packs.SOLUTION: A holding member (protector 142) holds a bus bar 141 that is fastened, respectively, to the terminal (anode side terminal 133) of a first battery pack 100 including multiple electric cells 110, and the terminal (cathode side terminal 134) of a second battery pack 100 including multiple electric cells 110, by means of a bolt 143. Body 142M of the protector 142 has insulation quality and holds the bus bar 141. Snap-fit 142c of the protector is coupled to the body 142M, and attaches the body 142M to an external member different from the body 142M. A rib 142d of the protector is coupled to the snap-fit 142c, and when the terminal and the bus bar 141 are fastened by means of the bolt 143, abuts on the external member thus regulating rotation of the bus bar 141.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a holding member and an assembled battery pack.

Conventionally, there is an assembled battery pack (battery pack) composed of a plurality of assembled batteries (battery modules). Each assembled battery is configured by electrically connecting a plurality of stacked unit cells (battery cells). Each assembled battery is electrically connected by a bus bar or the like fastened by a fastening member (bolt).
(See Patent Document 1).

Table 2013/084942

  In the configuration described in Patent Document 1, when the bus bar rotates following the rotation of the fastening member, a load is applied to the bus bar and a load is applied to the terminal of the assembled battery connected to the bus bar. In the configuration described in Patent Document 1, even if stress is applied to the bus bar or vibration or impact is propagated, a load is applied to the terminal of the bus bar and the assembled battery.

  The objective of this invention is providing the holding member and assembled battery pack which can fully hold | maintain the bus bar fastened by the rotating fastening member and electrically connecting between different assembled batteries.

  The holding member of the present invention for achieving the above object is fastened by a fastening member to each of a terminal of a first assembled battery having a plurality of unit cells and a terminal of a second assembled battery having a plurality of unit cells. Hold the bus bar. The holding member has a holding part, an attaching part, and a restricting part. The holding portion has an insulating property and holds the bus bar. The attachment part is connected to the holding part, and attaches the holding part to an external member different from the holding part. The restricting portion is connected to the attachment portion and restricts the rotation of the bus bar by abutting against the external member when the terminal and the bus bar are fastened by the fastening member.

  In order to achieve the above object, an assembled battery pack of the present invention includes a plurality of assembled batteries, a bus bar, a fastening member, and the holding member. The assembled battery includes a plurality of unit cells, an anode side terminal connected to an anode side terminal of the plurality of electrically connected unit cells, and a cathode side of the plurality of electrically connected unit cells. And a cathode side terminal connected to the terminal end. The bus bar electrically connects the anode side terminal of the first assembled battery and the cathode side terminal of the second assembled battery. The fastening member fastens the anode side terminal of the first assembled battery and one end of the bus bar, and fastens the cathode side terminal of the second assembled battery and the other end of the bus bar.

  According to the holding member and the assembled battery pack, it is possible to sufficiently hold the bus bar that is fastened by the rotating fastening member and electrically connects different assembled batteries.

It is a perspective view which shows the assembled battery pack of the state which connected the two assembled batteries which concern on embodiment by the electroconductive unit. It is a side view which shows the assembled battery pack of FIG. 1 partially. It is a perspective view which shows the state which removed the electroconductive unit from the two assembled batteries of FIG. After removing the conductive unit from the two assembled batteries, remove the pressure unit (upper pressure plate, lower pressure plate and left and right side plates) from one assembled battery, and part of the bus bar unit (protective cover and anode side) It is a perspective view which shows the state which removed the terminal and the cathode side terminal. It is a perspective view which decomposes | disassembles an electroconductive unit for every structural member and shows from upper direction. It is a perspective view which shows a part of main body part of the protector of the electroconductive unit of FIG. It is a perspective view which decomposes | disassembles an electroconductive unit for every structural member and shows from the downward direction. It is a perspective view which shows a part of coating | coated part of the protector of the electroconductive unit of FIG. It is a side view which shows an electroconductive unit by a cross section. It is a side view which decomposes | disassembles and shows the electroconductive unit of FIG. 9A for every structural member. It is a perspective view which shows the principal part of the state which joined the bus bar for electrode tabs to the electrode tab of the laminated | stacked single battery by a cross section. It is a side view which shows FIG. 10A from the side. It is a perspective view which shows the state which removed the bus bar holder and the electrode tab bus bar from the laminated body shown in FIG. It is a perspective view which shows the state which electrically connects the 1st cell subassembly shown in FIG. 11 and the 2nd cell subassembly by the bus bar for electrode tabs. 11 is a state in which the first cell sub-assembly (three sets of cells connected in parallel) shown in FIG. 11 is disassembled for each cell, and the first spacer and the second spacer are removed from one (the uppermost) cell. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, the same members are denoted by the same reference numerals, and redundant description is omitted. In the drawings, the size and ratio of each member are exaggerated to facilitate understanding of the embodiment, and may be different from the actual size and ratio.

  In each figure, the direction of the assembled battery 100 is shown using arrows represented by X, Y, and Z. The direction of the arrow represented by X indicates the longitudinal direction of the battery pack 100. The direction of the arrow represented by Y indicates the short direction of the battery pack 100. The direction of the arrow represented by Z indicates the stacking direction of the assembled battery 100.

  FIG. 1 is a perspective view showing an assembled battery pack 10 in a state where two assembled batteries 100 according to the embodiment are electrically connected by a conductive unit 140. FIG. 2 is a side view partially showing the assembled battery pack 10 of FIG. FIG. 3 is a perspective view partially showing a state in which the conductive unit 140 is removed from the two assembled batteries 100 of FIG. 4, after removing the conductive unit 140 from the two assembled batteries 100, the pressure unit 120 (the upper pressure plate 121, the lower pressure plate 122, and the left and right side plates 123) is removed from the one assembled battery 100, and It is a perspective view which shows the state which removed a part (protective cover 135, the anode side terminal 133, and the cathode side terminal 134) of the bus bar unit 130. FIG.

  FIG. 5 is a perspective view showing the conductive unit 140 disassembled for each constituent member and shown from above. FIG. 6 is a perspective view showing a part of the main body 142M of the protector 142 of the conductive unit 140 of FIG. FIG. 7 is a perspective view showing the conductive unit 140 disassembled for each component member and shown from below. FIG. 8 is a perspective view showing a part of the covering portion 142N of the protector 142 of the conductive unit 140 of FIG. FIG. 9A is a side view showing the conductive unit 140 by a cross section. FIG. 9B is an exploded side view of the conductive unit 140 of FIG. 9A for each component.

  FIG. 10A is a perspective view showing a cross-section of the main part in a state where the electrode tab bus bar 132 is joined to the electrode tab 112 of the stacked unit cell 110. FIG. 10B is a side view showing FIG. 10A from the side. FIG. 11 is a perspective view showing a state where the bus bar holder 131 and the electrode tab bus bar 132 are removed from the laminate 110S shown in FIG. FIG. 12 is a perspective view showing a state in which the first cell sub-assembly 110M and the second cell sub-assembly 110N shown in FIG. 13 disassembles the first cell sub-assembly 110M (three sets of unit cells 110 connected in parallel) shown in FIG. 11 for each unit cell 110, and the first spacer 110 from one (the uppermost) unit cell 110 has a first spacer. It is a perspective view which shows the state which removed 114 and the 2nd spacer 115.

  With reference to FIG. 3, the holding member (protector 142) according to the embodiment roughly includes a terminal (anode side terminal 133) of the first assembled battery 100 including a plurality of unit cells 110 and a unit cell 110. A bus bar 141 that is fastened by a fastening member (bolt 143) is held in each of the terminals (cathode side terminals 134) of the plurality of second assembled batteries 100 that are provided. The protector 142 includes a holding part (main body part 142M), an attaching part (snap fit 142c), and a restricting part (rib 142d). The main body 142M has an insulating property and holds the bus bar 141. The snap fit 142c is connected to the main body 142M, and attaches the main body 142M to an external member different from the main body 142M. The rib 142d is coupled to the snap fit 142c and regulates the rotation of the bus bar 141 by coming into contact with an external member when the terminal (the anode side terminal 133 and the cathode side terminal 134) and the bus bar 141 are fastened by the bolt 143.

  With reference to FIG. 3, the battery pack 10 according to the embodiment is briefly described as a plurality of battery packs 100, a bus bar 141, a pair of fastening members (bolts 143), and the holding member (protector 142). And having. The assembled battery 100 includes a plurality of single cells 110, an anode-side terminal 133 connected to the anode-side terminal of the plurality of electrically connected single cells 110, and a cathode of the plurality of electrically connected single cells 110. And a cathode side terminal 134 connected to the end of the side. The bus bar 141 electrically connects the anode side terminal 133 of the first assembled battery 100 and the cathode side terminal 134 of the second assembled battery 100. The bolt 143 fastens the anode side terminal 133 of the first assembled battery 100 and one end 141c of the bus bar 141, and fastens the cathode side terminal 134 of the second assembled battery 100 and the other end 141d of the bus bar 141.

  A plurality of assembled batteries 100 are mounted on a vehicle such as an electric vehicle, for example, and are used as a power source for driving a vehicle motor. Each assembled battery 100 is configured to be electrically connected by a conductive unit 140.

  The assembled battery pack 10 of the embodiment is configured by connecting two assembled batteries 100 by a conductive unit 140. When actually used in an electric vehicle, the assembled battery pack 10 is configured by connecting, for example, 16 assembled batteries 100 having the same specifications in series by 15 conductive units 140 having different lengths and shapes.

  Each assembled battery 100 is configured such that a stacked body 110 </ b> S formed by stacking a plurality of single cells 110 is electrically connected by a bus bar unit 130 in a state where the stacked body 110 </ b> S is pressurized by the pressure unit 120. That is, one assembled battery 100 is configured by the stacked body 110 </ b> S, the pressure unit 120, and the bus bar unit 130.

  Hereinafter, the configuration (stacked body 110S, pressure unit 120, and bus bar unit 130) of the assembled battery 100 and the configuration (conductive unit 140) that electrically connects each assembled battery 100 will be described.

  The configuration of the stacked body 110S will be described in detail.

  As shown in FIG. 11, the stacked body 110 </ b> S includes a first cell sub-assembly 110 </ b> M including three unit cells 110 electrically connected in parallel and a second cell sub-assembly 110 </ b> N including three unit cells 110 electrically connected in parallel. Alternately connected in series.

  As shown in FIG. 11, the first cell sub-assembly 110 </ b> M corresponds to the three unit cells 110 located in the second, fourth, and sixth stages from the bottom in the assembled battery 100. As shown in FIG. 11, in the assembled battery 100, the second cell sub-assembly 110N includes three unit cells located at the first (bottom), the third, the fifth, and the seventh (top) from the bottom. It corresponds to the battery 110.

  The first cell sub-assembly 110M and the second cell sub-assembly 110N have the same configuration. However, the first cell sub-assembly 110M and the second cell sub-assembly 110N have three anode-side electrode tabs 112A and three cathode-side electrode tabs 112K by replacing the top and bottom of the three unit cells 110 as shown in FIGS. Are arranged alternately along the Z direction. FIG. 12 shows, for example, a first cell sub-assembly 110M in the fourth stage from the bottom and a second cell sub-assembly 110N in the third stage from the bottom.

  In the first cell sub-assembly 110M, as shown in FIGS. 11 and 12, all the anode side electrode tabs 112A are located on the right side in the figure, and all the cathode side electrode tabs 112K are located on the left side in the figure. On the other hand, in the second cell sub-assembly 110N, as shown in FIGS. 11 and 12, all the anode side electrode tabs 112A are located on the left side in the figure, and all the cathode side electrode tabs 112K are located on the right side in the figure.

  In the first cell sub-assembly 110M and the second cell sub-assembly 110N, simply replacing the top and bottom so that the anode-side electrode tabs 112A and the cathode-side electrode tabs 112K are alternately arranged along the Z direction for every three unit cells 110. The direction of the tip 112d of the electrode tab 112 varies up and down in the Z direction. For this reason, each tip 112d is refracted downward so that the tips 112d of the electrode tabs 112 of all the unit cells 110 are aligned.

  The unit cell 110 corresponds to, for example, a lithium ion secondary battery. A plurality of unit cells 110 are connected in series in order to satisfy the specification of the drive voltage of the vehicle motor. A plurality of single cells 110 are connected in parallel in order to secure the capacity of the battery and extend the travel distance of the vehicle.

  As shown in FIGS. 10A and 10B, the unit cell 110 includes a battery body 110 </ b> H that is flat and includes a power generation element 111 that performs charging and discharging, an electrode tab 112 that faces the power generation element 111 to the outside, and the power generation element 111. The laminate film 113 to be stopped is included.

  The power generation element 111 charges electric power from an outdoor charging stand or the like and then discharges the electric power to the vehicle motor or the like to supply driving power. The power generation element 111 is configured by stacking a plurality of sets of anodes and cathodes separated by a separator.

  As shown in FIGS. 10A, 10B, and 11, the electrode tab 112 faces the power generation element 111 to the outside. The electrode tab 112 includes an anode side electrode tab 112A and a cathode side electrode tab 112K. The proximal end side of the anode side electrode tab 112A is joined to all the anodes included in one power generation element 111. The anode-side electrode tab 112A is formed from a thin plate and is made of aluminum in accordance with the characteristics of the anode. The base end side of the cathode side electrode tab 112K is joined to all the cathodes included in one power generation element 111. The cathode-side electrode tab 112K is formed from a thin plate and is made of copper in accordance with the characteristics of the cathode.

  As shown in FIG. 10B, the electrode tab 112 is formed in an L shape from the proximal end portion 112 c adjacent to the power generation element 111 to the distal end portion 112 d. The tip 112d of the electrode tab 112 is refracted along the lower side in the Z direction. The shape of the tip 112d of the electrode tab 112 is not limited to the L shape. For example, the electrode tab 112 may be formed in a U shape by further extending the distal end portion 112d and folding the extended portion toward the power generation element 111 side. Further, the base end portion 112c of the electrode tab 112 may be formed in a wave shape or a curved shape. The tip 112 d of the electrode tab 112 is in surface contact with the electrode tab bus bar 132.

  As shown in FIGS. 10A and 10B, the laminate film 113 is a pair and seals the battery body 110H by sandwiching it from the top and bottom along the Z direction. The pair of laminate films 113 lead out the anode-side electrode tab 112A and the cathode-side electrode tab 112K from the gap between the one end portions 113a along the Y direction toward the outside.

  The unit cells 110 are stacked as shown in FIGS. 10 and 11 while being supported by a pair of spacers (first spacer 114 and second spacer 115) as shown in FIG.

  As shown in FIGS. 4, 10A, and 10B, the pair of spacers (the first spacer 114 and the second spacer 115) arrange the unit cells 110 at regular intervals along the Z direction. The first spacer 114 supports the unit cell 110 on the side provided with the electrode tab 112. The second spacer 115 supports the unit cell 110 on the side not provided with the electrode tab 112 so as to face the first spacer 114 in the X direction of the unit cell 110.

  As shown in FIG. 13, the first spacer 114 is formed of a long plate shape having irregularities, and is made of reinforced plastics having insulating properties. The first spacer 114 is provided so as to face one end 113a of the pair of laminate films 113. As shown in FIGS. 10B and 13, the first spacer 114 supports one end 113 a of the laminate film 113 by a flat support surface 114 b. The first spacer 114 includes a contact surface 114h on a wall surface adjacent to the support surface 114b and extending in the Z direction. As shown in FIG. 10B, the contact surface 114h positions the tip 112d of the electrode tab 112 along the X direction. As shown in FIG. 13, the first spacer 114 includes a pair of connecting pins 114 c that protrude upward from both ends of the support surface 114 b along the Y direction. The pair of connecting pins 114c has a columnar shape, and the unit cell 110 is positioned by being inserted into connecting holes 113c opened at both ends along the Y direction of the one end 113a of the laminate film 113.

  As shown in FIG. 10B, the plurality of first spacers 114 are in contact with the upper surface 114 a of one first spacer 114 and the lower surface 114 d of another first spacer 114. As shown in FIG. 10B, the plurality of first spacers 114 are positioned so as to open to cylindrical positioning pins 114e protruding from the upper surface 114a of one first spacer 114 and lower surfaces 114d of the other first spacers 114. By positioning the holes 114f, they are positioned with respect to each other. As shown in FIG. 13, the first spacer 114 has locating holes 114g at both ends along the Y direction. Locating hole 114g inserts a bolt that connects the plurality of assembled batteries 100 while positioning them in the Z direction.

  Since the second spacer 115 does not need to support the electrode tab 112, the first spacer 114 is simplified. As shown in FIG. 13, the second spacer 115 includes a support surface 115 b that supports the other end 113 b of the laminate film 113, a positioning pin 114 e that positions the second spacers, and a single cell. 110 includes a connecting pin 115c for positioning 110, and a locate hole 115g for inserting a bolt for positioning and connecting the plurality of assembled batteries 100 to each other.

  The configuration of the pressure unit 120 will be described in detail.

  The pressurizing unit 120 includes an upper pressurizing plate 121 and a lower pressurizing plate 122 that pressurize the power generation element 111 of each unit cell 110 of the stacked body 110S from above and below, and an upper pressurizing plate 121 and a lower part that pressurize the stacked body 110S A pair of side plates 123 for fixing the pressure plate 122 is included.

  As shown in FIGS. 1 and 4, the upper pressure plate 121 and the lower pressure plate 122 sandwich and hold the plurality of unit cells 110 constituting the stacked body 110 </ b> S from above and below, and generate the power generation element of each unit cell 110. 111 is pressurized. The upper pressure plate 121 is formed in a plate shape having unevenness and is made of a metal having sufficient rigidity. The upper pressure plate 121 is provided on a horizontal plane. As shown in FIG. 4, the upper pressure plate 121 includes a pressure surface 121 a that pressurizes the power generation element 111 downward. The pressing surface 121a is formed flat and protrudes downward from the central portion of the upper pressing plate 121. The upper pressure plate 121 includes a locating hole 121b into which a bolt for connecting the assembled batteries 100 is inserted. The locate hole 121b is formed of a through hole and opens at the four corners of the upper pressure plate 121. As shown in FIGS. 1, 3, and 4, the upper pressure plate 121 includes rectangular holes 121c at the four outer corners of the pressure surface 121a.

  As shown in FIG. 4, the lower pressure plate 122 has the same shape as the upper pressure plate 121 and is provided to reverse the top and bottom of the upper pressure plate 121. Similar to the upper pressure plate 121, the lower pressure plate 122 is a locating hole into which a pressure surface 122 a that pressurizes the power generation element 111 upward and bolts that connect the battery packs 100 while positioning them in the Z direction are inserted. 122b. Unlike the upper pressure plate 121, the lower pressure plate 122 does not include holes in the outer four corners of the pressure surface 122a.

  As shown in FIGS. 1 and 4, the pair of side plates 123 fix the upper pressure plate 121 and the lower pressure plate 122 in a state where the stacked body 110 </ b> S is pressurized. That is, the pair of side plates 123 maintains a constant distance between the upper pressure plate 121 and the lower pressure plate 122. Further, the pair of side plates 123 covers and protects the side surfaces of the stacked unit cells 110 along the X direction. The side plate 123 is formed in a flat plate shape and is made of metal. The pair of side plates 123 are provided upright so as to face both side surfaces along the X direction of the stacked unit cells 110. The pair of side plates 123 are welded to the upper pressure plate 121 and the lower pressure plate 122.

  The configuration of the bus bar unit 130 will be described in detail.

  The bus bar unit 130 is electrically connected to a bus bar holder 131 that integrally holds a plurality of electrode tab bus bars 132, an electrode tab bus bar 132 that electrically connects electrode tabs 112 of the unit cells 110 arranged vertically. The anode-side terminals 133 that allow the anode-side ends of the plurality of unit cells 110 to face the conductive unit 140 and external input / output terminals, and the cathode-side ends of the plurality of the electrically connected unit cells 110 are connected to the conductive unit 140 and the outside And a protective cover 135 for protecting the electrode tab bus bar 132 and the like.

  As shown in FIGS. 4 and 11, the bus bar holder 131 integrally holds a plurality of electrode tab bus bars 132. The bus bar holder 131 integrally holds a plurality of electrode tab bus bars 132 in a matrix so as to face the electrode tabs 112 of each unit cell 110 of the stacked body 110S. The bus bar holder 131 is made of an insulating resin and has a frame shape.

  As shown in FIG. 11, the bus bar holder 131 is a pair of support columns that stand up along the Z direction so as to be positioned on both sides of the first spacer 114 that supports the electrode tab 112 of the unit cell 110. Each part 131a is provided. The pair of support columns 131 a are fitted to the side surfaces of the first spacer 114. The pair of support columns 131a are L-shaped when viewed along the Z direction, and are formed in a plate shape extending along the Z direction. The bus bar holder 131 is provided with a pair of auxiliary support columns 131b that stand up along the Z direction so as to be positioned near the center of the first spacer 114 in the longitudinal direction. The pair of auxiliary struts 131b are formed in a plate shape extending along the Z direction.

  As shown in FIG. 11, the bus bar holder 131 includes insulating portions 131 c that protrude between the electrode tab bus bars 132 adjacent in the Z direction. The insulating part 131c is formed in a plate shape extending along the Y direction. Each insulating part 131c is provided horizontally between the auxiliary support part 131b and the auxiliary support part 131b. The insulating portion 131c prevents discharge by insulating between the electrode tab bus bars 132 adjacent in the Z direction.

  The bus bar holder 131 may be formed by joining the supporting column 131a, the auxiliary supporting column 131b, and the insulating portion 131c formed independently of each other, or the supporting column 131a, the auxiliary supporting column 131b, and the insulating portion 131c are integrally formed. You may form and comprise.

  As shown in FIGS. 4, 10A, 10B, 11 and 12, the electrode tab bus bar 132 is for electrically connecting the electrode tabs 112 of the cells 110 arranged vertically. The electrode tab bus bar 132 electrically connects the anode side electrode tab 112 </ b> A of one unit cell 110 and the cathode side electrode tab 112 </ b> K of another unit cell 110. As shown in FIG. 12, the electrode tab bus bar 132 includes, for example, three anode side electrode tabs 112A arranged vertically in the first cell subassembly 110M and three cathode side electrode tabs 112K arranged vertically in the second cell subassembly 110N. Are electrically connected.

  That is, as shown in FIG. 12, the electrode tab bus bar 132 connects, for example, the three anode side electrode tabs 112A of the first cell subassembly 110M in parallel, and the three cathode side electrode tabs 112K of the second cell subassembly 110N. Connect in parallel. Furthermore, the electrode tab bus bar 132 connects three anode-side electrode tabs 112A of the first cell sub-assembly 110M and three cathode-side electrode tabs 112K of the second cell sub-assembly 110N in series. The electrode tab bus bar 132 is laser-welded to the anode side electrode tab 112 </ b> A of one unit cell 110 and the cathode side electrode tab 112 </ b> K of another unit cell 110.

  As shown in FIGS. 10A, 10B, and 11, the electrode tab bus bar 132 is configured by joining an anode side electrode tab bus bar 132A and a cathode side electrode tab bus bar 132K. The anode-side electrode tab bus bar 132A and the cathode-side electrode tab bus bar 132K have the same shape and are formed in an L shape. As shown in FIGS. 10A, 10B, and 11, the electrode tab bus bar 132 is formed by joining the refracted one end of the anode side electrode tab bus bar 132A and the refracted one end of the cathode side electrode tab bus bar 132K. It is integrated by the part 132c. As shown in FIG. 11, the anode side electrode tab bus bar 132A and the cathode side electrode tab bus bar 132K constituting the electrode tab bus bar 132 are provided with side portions 132d joined to the bus bar holder 131 at both ends along the Y direction. Yes.

  The anode-side electrode tab bus bar 132A is made of aluminum, like the anode-side electrode tab 112A of the unit cell 110. The cathode-side electrode tab bus bar 132K is made of copper, like the cathode-side electrode tab 112K of the unit cell 110. The anode side electrode tab bus bar 132A and the cathode side electrode tab bus bar 132K made of different metals are joined to each other by ultrasonic joining to form a joined portion 132c as shown in FIG. 10A.

  Among the electrode tab bus bars 132 arranged in a matrix, the electrode tab bus bar 132 located in the lower left of FIG. 11 corresponds to the anode end of 21 unit cells 110 (3 parallel 7 series). It consists only of the electrode tab bus bar 132A. As shown in FIG. 11, the anode-side electrode tab bus bar 132 </ b> A is laser-bonded to the anode-side electrode tabs 112 </ b> A of the leftmost three unit cells 110 among the stacked unit cells 110.

  Among the electrode tab bus bars 132 arranged in a matrix, the electrode tab bus bar 132 located at the upper right in FIG. 11 corresponds to the cathode end of the 21 cells 110 (3 parallel 7 series). It consists only of the electrode tab bus bar 132K. As shown in FIG. 11, the cathode-side electrode tab bus bar 132K is laser-bonded to the cathode-side electrode tabs 112K of the uppermost three unit cells 110 among the stacked unit cells 110.

  As shown in FIGS. 1, 3 and 4, the anode-side terminal 133 has the anode-side terminals of a plurality of electrically connected unit cells 110 facing the conductive unit 140 and an external input / output terminal. It is. As shown in FIG. 4, the anode-side terminal 133 is joined to the anode-side electrode tab bus bar 132A located at the lower left in the drawing among the electrode tab bus bars 132 arranged in a matrix.

  As shown in FIG. 4, the anode side terminal 133 is formed in a plate shape, and has one end 133b positioned above the side surface 133a standing along the Z direction and the other end 133c positioned below the side surface 133a. It is refracted in the X direction like a nail. The one end 133b includes a screw groove 133d for screwing the bolt 143 of the conductive unit 140. The other end 133c is refracted in the Z direction in addition to the X direction so as to face the anode side electrode tab bus bar 132A along the Z direction. The anode side terminal 133 is made of a metal having conductivity.

  As shown in FIGS. 1, 3 and 4, the cathode side terminal 134 has the cathode side ends of a plurality of electrically connected unit cells 110 facing the conductive unit 140 or an external input / output terminal. It is. As shown in FIG. 4, the cathode-side terminal 134 is joined to the cathode-side electrode tab bus bar 132K located in the upper right in the drawing among the electrode tab bus bars 132 arranged in a matrix.

  As shown in FIG. 4, the cathode side terminal 134 is formed in a plate shape, and has one end 134 b positioned above the side surface 134 a erected along the Z direction and the other end 134 c positioned below the side surface 134 a. It is refracted in the X direction like a nail. The one end 134b includes a screw groove 134d for screwing the bolt 143 of the conductive unit 140. The other end 134c is refracted in the Z direction in addition to the X direction so as to face the cathode side electrode tab bus bar 132K along the Z direction. The side surface 134 a of the cathode side terminal 134 has a shorter length along the Z direction than the side surface 133 a of the anode side terminal 133. The cathode side terminal 134 is made of a metal having conductivity.

  As shown in FIGS. 1 and 4, the protective cover 135 protects the plurality of electrode tab bus bars 132, the anode-side terminal 133, and the cathode-side terminal 134. That is, the protective cover 135 integrally covers the plurality of electrode tab bus bars 132 and the like so that the plurality of electrode tab bus bars 132 and the like come into contact with other members and the like, and an electrical short circuit occurs. To prevent. As shown in FIG. 4, the protective cover 135 has one end 135b positioned above the side surface 135a upstanding along the Z direction and the other end 135c positioned below the side surface 135a in the X direction like a claw. It consists of plastics that are refracted and have insulating properties.

  The protective cover 135 covers the plurality of electrode tab bus bars 132, the anode-side terminal 133, and the cathode-side terminal 134 with the side surface 135a, and fixes the bus bar holder 131 with the one end 135b and the other end 135c sandwiched from above and below. . The protective cover 135 has a first cutout 135d made of a rectangular cutout and facing the anode side terminal 133 to the outside, and a second cutout 135e made of a rectangular cutout and facing the cathode side terminal 134 to the outside, respectively. It is provided at one end 135b.

  The configuration (bus bar 141, protector 142, and bolt 143) of the conductive unit 140 will be described in detail.

  The bus bar 141 is shown in FIGS. 3 to 9B and the like, and electrically connects the first assembled battery 100 and the second assembled battery 100.

  As shown in FIGS. 5 and 7, the bus bar 141 is made of a long plate-shaped metal having a back surface 141a and a front surface 141b. The long bus bar 141 is arranged along the Y direction so that both ends (one end 141c and the other end 141d) are located on the left and right in FIG. As shown in FIG. 5, one end 141c of the bus bar 141 is refracted downward in the Z direction, and the refracted portion is refracted so as to be away from the central portion of the bus bar 141 along the X direction. One end 141c of the bus bar 141 is provided with a screw hole 141e into which the bolt 143 is inserted. One end 141 c of the bus bar 141 is connected to one end 133 b of the anode side terminal 133 of the first assembled battery 100.

  As shown in FIG. 5, the other end 141d of the bus bar 141 is refracted downward in the Z direction, and the refracted portion is the center of the bus bar 141 along the X direction, like the one end 141c of the bus bar 141. It is refracted away from the part. The other end 141d of the bus bar 141 is provided with a screw hole 141f into which the bolt 143 is inserted, similarly to the one end 141c of the bus bar 141. The other end 141 d of the bus bar 141 is connected to one end 134 b of the cathode side terminal 134 of the second assembled battery 100. The bus bar 141 is made of, for example, copper or aluminum having excellent conductivity.

  The protector 142 is shown in FIGS. 3 to 9B and the like, and holds the bus bar 141.

  As shown in FIGS. 5, 7, and 9 </ b> B, the protector 142 includes a main body portion 142 </ b> M that has insulation and accommodates and holds the bus bar 141, and a covering portion 142 </ b> N that has insulation and covers the bus bar 141. It is provided so that it can be separated.

  As shown in FIG. 9A, the main body portion 142M accommodates the bus bar 141 covered with the covering portion 142N. As shown in FIGS. 7, 9A, and 9B, the main body 142M is formed integrally with the snap fit 142c. The snap fit 142c is attached in contact with the inner edge of the hole 121c of the upper pressure plate 121 of the assembled battery 100 shown in FIG.

  As shown in FIGS. 7, 9A, and 9B, the main body 142M is formed integrally with the rib 142d. The rib 142d is for contacting the inner edge of the hole 121c of the upper pressure plate 121 of the assembled battery 100 shown in FIG. 3 to restrict the rotation of the bus bar 141. That is, the rib 142d has a snap-fastening 142c and a function of fastening around the bus bar 141. As shown in FIGS. 5, 6, and 9 </ b> B, the main body 142 </ b> M has a concave shape with an opening upward, and includes a protrusion 142 i that protrudes inward from the inner side surface 142 h.

  Specifically, as shown in FIGS. 5 and 7, the main body 142 </ b> M is composed of a long plate-shaped insulator having a back surface 142 a and a front surface 142 b. The long main body 142 </ b> M is arranged along the Y direction, similarly to the bus bar 141. The snap fit 142c is formed in a plate shape and protrudes downward in the Z direction from the back surface 142a. The snap fit 142c has a hook-like tip corresponding to the lowest part in the Z direction. The tip of the snap fit 142c protrudes outward in the radial direction of the hole 121c of the upper pressure plate 121, and is hooked on the inner edge of the hole 121c. The rib 142d is formed in a rectangular parallelepiped shape, and protrudes downward in the Z direction from the back surface 142a.

  In the main body 142M, the snap fit 142c and the rib 142d are formed close to each other on the back surface 142a of the main body 142M so that the snap fit 142c and the rib 142d are attached to face the inner edge of the same hole 121c of the upper pressure plate 121. ing. When the snap fit 142c and the rib 142d are inserted into the same hole 121c of the upper pressure plate 121, the side surface of the snap fit 142c and the inner edge of the hole 121c are in contact with each other, and the side surface of the rib 142d and the inner edge of the hole 121c are In contact.

  The main body 142M includes a lower holding surface 142e corresponding to the shape of the back surface 141a of the bus bar 141 excluding the one end 141c and the other end 141d on the surface 142b side. In the main body 142M, the lower holding surface 142e is provided with a step so as to be slightly higher in the Z direction than the surface 142b. The lower holding surface 142e has a first inner wall 142f and a first outer wall 142g facing each other along the Y direction projecting upward on both side surfaces in the X direction. The bus bar 141 covered with the covering portion 142N is accommodated in a concave portion constituted by the lower holding surface 142e, the first inner wall 142f, and the first outer wall 142g. The lower holding surface 142e contacts the back surface 141a of the bus bar 141 and holds the bus bar 141.

  In the main body 142M, each surface where the first inner wall 142f and the first outer wall 142g face each other corresponds to the inner side surface 142h provided with the protrusion 142i. Two protrusions 142i are provided on the inner side surface 142h of the first inner wall 142f so as to be sufficiently separated along the Y direction. Similarly, two protrusions 142i are provided on the inner side surface 142h of the first outer wall 142g with sufficient separation along the Y direction. The protrusion 142i on the inner side surface 142h of the first inner wall 142f faces the protrusion 142i on the inner side surface 142h of the first outer wall 142g along the X direction. That is, the protrusion 142i has a function as a wedge.

  The main body 142M is provided with a reinforcing wall 142j composed of three side walls protruding in the Z direction on the front surface 142b side so as to face the snap fit 142c and the rib 142d formed on the back surface 142a side. The reinforcing wall 142j on the front surface 142b side absorbs vibrations and shocks applied to the snap fit 142c and the rib 142d on the back surface 142a side. The main body 142M is made of resin, for example.

  9A, the covering portion 142N is accommodated in the main body portion 142M together with the bus bar 141 from the back surface 141a side facing the front surface 141b of the bus bar 141 in a state where the bus bar 141 is covered from the front surface 141b side of the bus bar 141. The As shown in FIGS. 7, 8, and 9 </ b> B, the covering portion 142 </ b> N has a concave shape with an opening below, and includes a protrusion 142 t that protrudes inward from the inner side surface 142 s.

  Specifically, the covering portion 142N includes an upper holding surface 142p corresponding to the shape of the surface 141b of the bus bar 141 excluding the one end 141c and the other end 141d. The upper holding surface 142p projects downward the second inner wall 142q and the second outer wall 142r facing each other along the Y direction on both side surfaces in the X direction. The bus bar 141 is covered from above by a concave portion constituted by the upper holding surface 142p, the second inner wall 142q, and the second outer wall 142r. The upper holding surface 142p is in contact with the surface 141b of the bus bar 141 and holds the bus bar 141.

  In the covering portion 142N, each surface where the second inner wall 142q and the second outer wall 142r face each other corresponds to the inner side surface 142s provided with the protrusion 142t. Two protrusions 142t are provided on the inner side surface 142s of the second inner wall 142q so as to be sufficiently separated in the Y direction. Similarly, two protrusions 142t are provided on the inner side surface 142s of the second outer wall 142r so as to be sufficiently separated along the Y direction. The protrusion 142t on the inner side surface 142s of the second inner wall 142q faces the protrusion 142t on the inner side surface 142s of the second outer wall 142r along the X direction. That is, the protrusion 142t has a function as a wedge. The covering portion 142N is made of resin, for example.

  The bolt 143 is shown in FIGS. 3 to 9B and the like, and fastens the bus bar 141 to the assembled battery 100.

  Bolt 143 consists of a hexagon bolt, for example. One bolt 143 is inserted into one screw hole 141 e of the bus bar 141 and screwed into the screw groove 133 d of the anode side terminal 133 of the first assembled battery 100. The other bolt 143 is inserted into the other screw hole 141 f of the bus bar 141 and screwed into the screw groove 134 d of the cathode side terminal 134 of the second assembled battery 100.

  When one head 143 is rotated clockwise by a spanner or a wrench, one bolt 143 sandwiches one end 141c of the bus bar 141 between the head and one end 133b of the anode side terminal 133. When the head of the other bolt 143 is rotated clockwise by a spanner or a wrench, the other end 141d of the bus bar 141 is sandwiched between the head and one end 134b of the cathode side terminal 134. The bus bar 141 in contact with the head of the bolt 143 generates torque as the bolt 143 rotates.

  The effect of embodiment described above is demonstrated.

  The protector 142 includes a terminal (anode side terminal 133) of the first assembled battery 100 having a plurality of unit cells 110 and a terminal (cathode side terminal 134) of the second assembled battery 100 having a plurality of unit cells 110. The bus bar 141 fastened by the bolt 143 is held. The protector 142 includes a main body 142M, a snap fit 142c, and a rib 142d. The main body 142M has an insulating property and holds the bus bar 141. The snap fit 142c is connected to the main body 142M, and attaches the main body 142M to an external member different from the main body 142M. The rib 142d is coupled to the snap fit 142c and regulates the rotation of the bus bar 141 by coming into contact with an external member when the terminal (the anode side terminal 133 and the cathode side terminal 134) and the bus bar 141 are fastened by the bolt 143.

  The assembled battery pack 10 includes a plurality of assembled batteries 100, a bus bar 141, a fastening member (bolt 143), and the protector 142 described above. The assembled battery 100 includes a plurality of single cells 110, an anode-side terminal 133 connected to the anode-side terminal of the plurality of electrically connected single cells 110, and a cathode of the plurality of electrically connected single cells 110. And a cathode side terminal 134 connected to the end of the side. The bus bar 141 electrically connects the anode side terminal 133 of the first assembled battery 100 and the cathode side terminal 134 of the second assembled battery 100. The bolt 143 fastens the anode side terminal 133 of the first assembled battery 100 and one end 141c of the bus bar 141, and fastens the cathode side terminal 134 of the second assembled battery 100 and the other end 141d of the bus bar 141.

  According to the protector 142 and the assembled battery pack 10 having the protector 142, when the bus bar 141 is fastened to the anode side terminal 133 or the cathode side terminal 134 using the bolt 143, the bus bar 141 that is driven by the rotation of the bolt 143 is used. This rotation can be restricted by the rib 142d of the protector 142 in contact with the upper pressure plate 121. That is, the rib 142 d of the protector 142 functions as a fastening around the bus bar 141. Furthermore, the stress applied to the bus bar 141 and the vibration and impact propagated to the bus bar 141 can be absorbed by the snap fit 142 c of the protector 142 attached to the upper pressure plate 121. Therefore, according to the protector 142 and the assembled battery pack 10 having the protector 142, the bus bar 141 that is fastened by the rotating bolt 143 and electrically connects the different assembled batteries 100 can be sufficiently held.

  In the protector 142, the main body 142M preferably has a concave shape that accommodates the bus bar 141, and the concave inner surface 142h is preferably formed with a protrusion 142i that contacts the bus bar 141 and supports the bus bar 141.

  According to the protector 142, the main body 142M can insulate the bus bar 141 from other members, and can be easily held by inserting the bus bar 141 into the interior (via the covering portion 142N). Can do. Furthermore, rattling (movement of the member in the gap) between the protector 142 and the bus bar 141 (via the covering portion 142N) can be eliminated by the protrusion 142i of the main body portion 142M. Therefore, the protrusion 142i of the main body 142M can effectively absorb the vibration and impact propagating from the bus bar 141 and the vibration and impact propagating to the bus bar 141 (via the covering portion 142N).

  Further, according to the protector 142, manufacturing errors of the protector 142 and the bus bar 141 can be absorbed by the protrusion 142i of the main body 142M. Therefore, the protector 142 and the bus bar 141 manufactured inexpensively can be used.

  Further, according to the protector 142, the contact portion between the protector 142 and the bus bar 141 (via the covering portion 142N) can be reduced by the protrusion 142i of the main body 142M. Therefore, the pressure required for insertion can be reduced, and the assemblability of the protector 142 and the bus bar 141 (via the covering portion 142N) can be improved. That is, the number of man-hours required for manufacturing can be shortened.

  The protector 142 preferably further includes a covering portion 142N having a protrusion 142t that has an insulative shape and covers the bus bar 141 and that protrudes inward from the inner side surface 142s. In a state where the bus bar 141 is covered from the one surface (front surface 141b) side of the bus bar 141, the covering portion 142N is held together with the bus bar 141 from the other surface (back surface 141a) side opposite to the one surface (front surface 141b) of the bus bar 141. Main body 142M).

  According to this protector 142, the bus bar 141 and other members can be sufficiently insulated by the covering portion 142N and the main body portion 142M, and can be easily covered (assembled) by inserting the bus bar 141 into the interior. be able to. Furthermore, rattling (movement of the member in the gap) between the protector 142 and the bus bar 141 can be eliminated by the protrusion 142t of the covering portion 142N. Therefore, the protrusion 142t of the covering portion 142N can effectively absorb the vibration and impact propagating from the bus bar 141 and the vibration and impact propagating to the bus bar 141.

  Further, according to the protector 142, manufacturing errors of the protector 142 and the bus bar 141 can be absorbed by the protrusion 142t of the covering portion 142N. Therefore, the protector 142 and the bus bar 141 manufactured inexpensively can be used.

  Further, according to the protector 142, the contact portion between the protector 142 and the bus bar 141 can be reduced by the protrusion 142t of the covering portion 142N. Therefore, the pressure required for insertion can be reduced, and the assemblability of the protector 142 and the bus bar 141 can be improved. That is, the number of man-hours required for manufacturing can be shortened.

  In the assembled battery pack 10, the external member is at least one of a pair of pressure members (upper pressure plate 121 and lower pressure plate 122) that sandwich and pressurize the plurality of unit cells 110 from both sides, and the snap fit 142c is The upper pressure plate 121 is preferably attached in contact with the inner edge of the hole 121c.

  According to the assembled battery pack 10, it is not necessary to separately prepare a bracket for fixing the snap fit 142 c of the protector 142. Furthermore, in order to attach the snap fit 142c of the protector 142, it is not necessary to provide the upper pressure plate 121 with a special structure or to change the outer shape of the upper pressure plate 121. Therefore, the assembled battery pack 10 including the plurality of assembled batteries 100 and the protector 142 can maximize the volume efficiency.

  Further, according to the assembled battery pack 10, the upper pressure plate 121 is formed in a convex shape (corresponding to the pressure surface 121 a) downward in order to pressurize the unit cell 110. Therefore, even if the hole 121c is provided in the portion around the pressure surface 121a of the upper pressure plate 121 and the snap fit 142c of the protector 142 is inserted into the hole 121c, interference with the unit cell 110 or the like can be prevented.

  Further, according to the assembled battery pack 10, the upper pressurizing plate 121 has sufficient strength to pressurize the unit cell 110. Therefore, even if the upper pressure plate 121 is provided with the hole 121c, the mechanical characteristics can be maintained.

  In the assembled battery pack 10, the rib 142d is preferably brought into contact with the inner edge of the same hole 121c so as to face the snap fit 142c.

  According to the assembled battery pack 10, the rotation of the bus bar 141 driven by the rotation of the bolt 143 is effective by the rib 142d of the protector 142 and the snap fit 142c provided so as to face the inner edge of the hole 121c of the upper pressure plate 121. Can be regulated. Furthermore, according to the assembled battery pack 10, the rib 142d of the protector 142 and the snap fit are provided so that the stress applied to the bus bar 141 and the vibration and impact propagated to the bus bar 141 are opposed to the inner edge of the hole 121c of the upper pressure plate 121. By 142c, it can absorb effectively.

  Further, according to the assembled battery pack 10, the rib 142 d and the snap fit 142 c are brought into contact with the inner edge of the same hole 121 c of the upper pressure plate 121. Compared to the case, the shape of the protector 142 can be reduced.

  Further, according to the assembled battery pack 10, the upper pressure plate 121 is formed in a convex shape (corresponding to the pressure surface 121 a) downward in order to pressurize the unit cell 110. Therefore, even if the hole 121c is provided in the portion around the pressure surface 121a of the upper pressure plate 121 and the rib 142d of the protector 142 is inserted into the hole 121c, interference with the unit cell 110 or the like can be prevented.

  In addition, the present invention can be variously modified based on the configurations described in the claims, and these are also within the scope of the present invention.

  For example, in the embodiment, the assembled battery pack 10 has been described with the configuration in which two assembled batteries 100 arranged in the left-right direction (Y direction) are connected by one conductive unit 140, but the configuration is limited to such a configuration. There is nothing. The assembled battery pack 10 connects a plurality of assembled batteries 100 arranged in the front-rear direction (X direction) and the vertical direction (Z direction) in addition to the left-right direction (Y direction) by a plurality of conductive units 140 having different lengths and shapes. Can be configured.

  In the embodiment, the protector 142 has been described as holding the bus bar 141 that connects the anode-side terminal 133 of the first assembled battery 100 and the cathode-side terminal 134 of the second assembled battery 100. It is not limited to a simple configuration. For example, the protector 142 may hold a bus bar 141 that connects the anode terminal 133 of the first assembled battery 100 and the anode terminal 133 of the second assembled battery 100. In this case, the first assembled battery 100 and the second assembled battery 100 are electrically connected in parallel.

  Moreover, although the external member which attaches the snap fit 142c of the protector 142 was demonstrated as the upper pressurizing plate 121 of the assembled battery 100 in embodiment, it is not limited to such a structure. The external member can be configured as a housing or a bracket provided in a vehicle on which the assembled battery 100 is mounted.

  In the embodiment, the external member for attaching the snap fit 142c of the protector 142 and the external member for contacting the rib 142d of the protector 142 have been described as the same member (upper pressure plate 121), but are configured as different members. May be.

  In the embodiment, the snap fit 142c and the rib 142d of the protector 142 have been described as being connected to the hole 121c of the upper pressure plate 121, but the invention is not limited to such a configuration. The snap fit 142c and the rib 142d of the protector 142 may be connected to a notch or a protrusion provided in the upper pressure plate 121 or the like.

  In the embodiment, the hole 121c of the upper pressure plate 121 into which the snap fit 142c and the rib 142d of the protector 142 are inserted has been described as a hole penetrating the upper pressure plate 121 along the Z direction. There is no limit. The hole 121c may be constituted by a concave hole having a sufficient depth into which the snap fit 142c and the rib 142d of the protector 142 can be inserted.

  In the embodiment, the hole 121c of the upper pressure plate 121 into which the snap fit 142c and the rib 142d of the protector 142 are inserted has been described as the same hole 121c, but may be configured as different holes 121c.

  Further, in the embodiment, the hole 121c of the upper pressure plate 121 where the rib 142d and the snap fit 142c are brought into contact with each other is close to the fixing point of the bus bar 141 and the anode side terminal 133 or the fixing point of the bus bar 141 and the cathode side terminal 134. By setting to, the weight of the bus bar 141 is not easily applied to the fixed point. Therefore, by shortening the distance between the hole 121c and the fixing point, the weight of the bus bar 141 can be reduced, and the bus bar 141 can be fastened and the vibration and shock of the bus bar 141 can be effectively absorbed.

  In the embodiment, the protector 142 may not include the covering portion 142N. When the protector 142 does not include the covering portion 142N, the protector 142 causes the protrusion 142i of the main body portion 142M to contact the bus bar 141.

10 battery packs,
100 battery packs,
110 cell,
110M first cell sub-assembly,
110N second cell sub-assembly,
110S laminate,
110H battery body,
111 power generation elements,
112 electrode tabs,
112A anode side electrode tab,
112K cathode side electrode tab,
113 Laminate film,
114 first spacer,
115 second spacer,
120 pressure unit,
121 Upper pressure plate,
121c hole,
122 Lower pressure plate,
123 side plate,
130 bus bar unit,
131 Bus bar holder,
132 bus bar for electrode tab,
132A anode side electrode tab bus bar,
132K cathode side electrode tab bus bar,
133 Anode terminal,
134 cathode side terminal,
135 protective cover,
140 conductive unit,
141 Busbar,
141a Back side (other side),
141b surface (one side),
141c one end,
141d the other end,
141e, 141f screw holes,
142 protector (holding member),
142M body part (holding part),
142N covering part,
142c snap fit (mounting part),
142d rib (regulator),
142h, 142s inner surface,
142i, 142t protrusions,
143 volts,
X The longitudinal direction of the battery pack 100,
Y Short direction of the assembled battery 100,
Z Stack direction of the assembled battery 100.

Claims (6)

A holding member for holding a bus bar fastened by a fastening member to each of a terminal of a first assembled battery including a plurality of cells and a terminal of a second assembled battery including a plurality of cells,
A holding part having insulation and holding the bus bar;
An attachment part connected to the holding part, and attaching the holding part to an external member different from the holding part;
A holding member connected to the mounting portion and having a restricting portion that restricts rotation of the bus bar by contacting the external member when the terminal and the bus bar are fastened by the fastening member.   The holding member according to claim 1, wherein the holding portion has a concave shape that accommodates the bus bar, and a protrusion that contacts the bus bar and supports the bus bar is formed on the inner surface of the concave shape. . It has a concave shape that covers the bus bar with insulation, and further has a covering portion that includes a protrusion protruding inward from the inner surface,
The said coating | coated part is accommodated in the said holding | maintenance part with the said bus bar from the other surface side facing the said one surface of the said bus bar in the state which covered the said bus bar from the one surface side of the said bus bar. Holding member. A plurality of single cells, an anode-side terminal connected to the anode-side terminal of the plurality of electrically connected single cells, and a cathode connected to the cathode-side terminal of the plurality of electrically connected single cells A plurality of assembled batteries each having a side terminal;
A bus bar that electrically connects the anode side terminal of the first assembled battery and the cathode side terminal of the second assembled battery;
A fastening member that fastens the anode side terminal of the first assembled battery and one end of the bus bar, and fastens the cathode side terminal of the second assembled battery and the other end of the bus bar;
A holding part that has an insulating property and holds the bus bar; and is connected to the holding part, and is attached to the attaching part that attaches the holding part to an external member different from the holding part; A battery pack comprising: a holding member provided with a restricting portion that restricts rotation of the bus bar by contacting the external member when the terminal and the bus bar are fastened by a fastening member. The external member is at least one of a pair of pressure members that sandwich and pressurize the plurality of unit cells from both sides,
The assembled battery pack according to claim 4, wherein the attachment portion is attached in contact with an inner edge of a hole provided in the pressure member.   The assembled battery pack according to claim 5, wherein the restricting portion is brought into contact with an inner edge of the same hole so as to face the attachment portion.