JP2018006276A - Battery pack and power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of improving heat dissipation, and to provide a power supply device.SOLUTION: A battery pack (100) includes multiple battery cells (150), a cell holder (120) for holding the multiple battery cells (150) in a lower case (110), an inter-cell bus bar (160) welded to the electrode terminals of the multiple battery cells (150) on the upper surface of the cell holder (120), and electrically connecting the electrode terminals of different battery cells (150) out of the multiple battery cells (150), and a secondary battery controller substrate (140) which is fixed to the cell holder (120), by being tightened together with the fastening point of the inter-cell bus bar (160) from the upper surface side. In the top view, the weld of the inter-cell bus bar (160) is exposed from the secondary battery controller substrate (140).SELECTED DRAWING: Figure 12

Description

  The present invention relates to an assembled battery and a power supply device.

  Conventionally, an assembled battery including a plurality of battery cells and a control circuit board that detects and controls the voltage of each battery cell is known. For example, Patent Document 1 discloses an assembled battery in which a control circuit board is mounted above a battery module including a plurality of battery cells.

JP 2013-196932 A

  However, in the assembled battery disclosed in Patent Document 1, the bus bar between the electrodes connecting the electrodes of the battery cells is a mixture of those covered by the control circuit board and those not covered in the top view. Yes. Therefore, the location where the heat dissipation in the assembled battery at the time of charging / discharging becomes low may occur depending on the positional relationship between the bus bar and the control circuit board.

  The objective of this invention made | formed in view of this viewpoint is providing the assembled battery and power supply device which can improve heat dissipation.

In order to solve the above problem, the assembled battery according to the first aspect is:
A plurality of battery cells;
A cell holder for holding the plurality of battery cells in a lower case;
An inter-cell bus bar that is welded to the electrode terminals of the plurality of battery cells on the upper surface of the cell holder and electrically connects the electrode terminals of different battery cells among the plurality of battery cells;
A secondary battery controller board fixed to the cell holder by being fastened together with a fastening point of the inter-cell bus bar from the upper surface side,
A welded portion of the inter-cell bus bar is exposed from the secondary battery controller board in a top view.

The assembled battery according to the second aspect is
A plurality of battery cells;
A cell holder for holding the plurality of battery cells in a lower case;
An inter-cell bus bar that is welded to the electrode terminals of the plurality of battery cells on the upper surface of the cell holder and electrically connects the electrode terminals of different battery cells among the plurality of battery cells;
A secondary battery controller board fixed to the cell holder by being fastened together with a fastening point of the inter-cell bus bar from the upper surface side,
More than half of the area of the inter-cell bus bar in the top view is exposed from the secondary battery controller board.

An assembled battery according to the third aspect is
A plurality of battery cells;
A cell holder for holding the plurality of battery cells in a lower case;
A plurality of inter-cell bus bars that are welded to electrode terminals of the plurality of battery cells on the upper surface of the cell holder, and electrically connect the electrode terminals of different battery cells among the plurality of battery cells;
A secondary battery controller board fixed to the cell holder by being fastened together with a fastening point of the inter-cell bus bar from the upper surface side,
For the plurality of inter-cell bus bars, the ratio of the area of the exposed portion from the secondary battery controller board to the area of the inter-cell bus bar in a top view is substantially the same.

The assembled battery according to the fourth aspect is
The inter-cell bus bar includes a plurality of the fastening points, and is fastened to the cell holder together with the secondary battery controller board by being fastened together at all of the plurality of fastening points.

An assembled battery according to the fifth aspect is
The plurality of fastening points of the inter-cell bus bar are arranged at positions symmetrical with respect to a bisector of the two electrode terminals to be electrically connected in a top view,
At least one of the plurality of fastening points is joined to the secondary battery controller board as a voltage detection line.

  Moreover, the power supply device which concerns on a 6th viewpoint is provided with the said assembled battery, It is characterized by the above-mentioned.

  According to the assembled battery according to the first aspect, since at least a part of all the inter-cell bus bars is exposed from the secondary battery controller board in a top view, the heat dissipation of the inter-cell bus bars can be ensured, The heat dissipation as a whole assembled battery can be improved. In addition, since the weld portion of the inter-cell bus bar is exposed from the secondary battery controller board in a top view, the operator can check whether the inter-cell bus bar is appropriately welded in the manufacturing process of the assembled battery. It can be easily confirmed visually.

  Moreover, according to the assembled battery which concerns on a 2nd viewpoint, since more than half of the area in the top view of an inter-cell bus bar is exposed from the secondary battery controller board, the heat dissipation of an inter-cell bus bar improves.

  Moreover, according to the assembled battery which concerns on a 3rd viewpoint, since the dispersion | variation in the heat dissipation between each inter-cell bus bar can be suppressed about several inter-cell bus bars, the dispersion | variation in the temperature of each battery cell can be suppressed. As a result, it becomes easy to suppress variations in the deterioration of the battery cells.

  Moreover, according to the assembled battery which concerns on a 4th viewpoint, the support strength of a battery cell can be improved.

  Moreover, according to the assembled battery which concerns on a 5th viewpoint, the cell voltage of a battery cell can be detected in any of the fastening points in each inter-cell bus bar.

  Further, according to the power supply device of the sixth aspect, since at least a part of all the inter-cell bus bars is exposed from the secondary battery controller board in a top view, it is possible to ensure the heat dissipation of the inter-cell bus bars. It is possible to improve heat dissipation as a whole assembled battery.

It is an external appearance perspective view of the assembled battery which concerns on one Embodiment of this invention. It is a functional block diagram which shows the outline of the power supply system containing the assembled battery shown in FIG. It is an external appearance perspective view of the assembled battery which shows the lower case and cell holder of the assembled battery of FIG. 1 in a transparent state. It is a disassembled perspective view of the assembled battery of FIG. It is an external appearance perspective view of the lower case of FIG. FIG. 6 is a top view of the lower case of FIG. 5. It is an external appearance perspective view of the cell holder of FIG. It is an external appearance perspective view which shows the state which attached the cell holder of FIG. 7 to the lower case of FIG. It is an expansion appearance perspective view of a bus bar between cells attached to a cell holder. It is a figure which shows typically the adhesion position of the battery cell in the assembled battery of FIG. 1, a lower case, and a cell holder. It is a figure which shows typically the state before and behind the engagement nail | claw of a cell holder and the engagement hole of a lower case. It is a top view of the cell holder which shows the state which fixed the LBC board | substrate to the cell holder by fastening. It is an external appearance perspective view of the auxiliary machine base of FIG. It is a side view at the time of seeing the auxiliary machine base of FIG. 1 from one side. It is an external appearance perspective view of the auxiliary machine base which shows the state which attached each component and the bus bar. It is a top view of the auxiliary machine base which shows the state which fixed each component and the bus bar with the nut. It is a figure which shows the mode of the assembly of the whole assembled battery. It is a figure for demonstrating the mode of an assembly | attachment of a battery module group and an auxiliary machine module group.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an external perspective view of an assembled battery according to an embodiment of the present invention, and is an external perspective view showing a state where an upper case of the assembled battery is removed. However, in FIG. 1, the depiction of each part is shown in a simplified manner. Refer to FIGS. 5 to 16 for details of each part. The assembled battery 100 includes a lower case 110 that houses battery cells, a cell holder 120 that holds battery cells housed in the lower case 110 on a side to which the upper case is attached (hereinafter also referred to as “upper surface side”), and a cell holder 120. 1 is provided with an auxiliary machine base 200 attached to the upper surface side, various parts attached to the auxiliary machine base 200, and an upper case (not shown in FIG. 1) for protecting the various parts.

  In the present embodiment, the assembled battery 100 includes a metal oxide semiconductor field effect transistor (MOSFET) 210, a relay 220, a current sensor 230, and a fusible link 240 as various components attached to the auxiliary machine base 200. The assembled battery 100 includes three terminals, that is, an SSG terminal 250, a LOAD terminal 260, and a GND terminal 270 that protrude to the outside of the upper case when the upper case is attached.

  In the present embodiment, the assembled battery 100 will be described as being used by being mounted on a vehicle such as a vehicle equipped with an internal combustion engine or a hybrid vehicle capable of traveling with the power of both the internal combustion engine and the electric motor. The use of the battery 100 is not limited to the vehicle.

  FIG. 2 is a functional block diagram showing an outline of a power supply system including the assembled battery 100 shown in FIG. The power supply system 400 includes an assembled battery 100, an alternator 410, a starter 420, a second secondary battery 430, a load 440, a switch 450, and a control unit 460. The assembled battery 100 includes a first secondary battery 130 housed in the lower case 110. The first secondary battery 130, the alternator 410, the starter 420, the second secondary battery 430, and the load 440 are connected in parallel.

  The assembled battery 100 includes a MOSFET 210, a relay 220, a current sensor 230, a fusible link 240, a first secondary battery 130, and a secondary battery controller (LBC) 140. Relay 220, current sensor 230, fusible link 240, and first secondary battery 130 are connected in series in this order. MOSFET 210 is connected in series to second secondary battery 430 and load 440.

  In the assembled battery 100, the SSG terminal 250 is connected to the alternator 410, and the LOAD terminal 260 is connected to the load 440. The GND terminal 270 is used for grounding.

  The relay 220 functions as a switch that connects or disconnects the first secondary battery 130 in parallel with each component outside the assembled battery 100 in the power supply system 400.

  The current sensor 230 has an appropriate structure, and measures the current flowing through the circuit including the first secondary battery 130 by an appropriate method.

  The fusible link 240 is composed of a fuse body, a housing made of an insulating resin that accommodates and holds the fuse body, and a cover made of an insulating resin that covers the housing, and is blown when an overcurrent occurs.

  The first secondary battery 130 is configured by an assembly of battery cells 150 accommodated in the lower case 110 as shown in FIG. 3 in which the lower case 110 and the cell holder 120 are transparent. Each battery cell 150 constituting the first secondary battery 130 is, for example, a lithium ion battery, but may be another secondary battery such as a nickel metal hydride battery. The first secondary battery 130 has a positive electrode side connected to the fusible link 240 and a negative electrode side grounded via a GND terminal 270.

  MOSFET 210 functions as a switch for connecting or disconnecting second secondary battery 430 and load 440 in parallel with other components in power supply system 400.

  The LBC 140 is connected to the first secondary battery 130 and estimates the state of the first secondary battery 130. The LBC 140 estimates a state of charge (SOC) of the first secondary battery 130, for example.

  Alternator 410 is a generator and is mechanically connected to the engine of the vehicle. Alternator 410 generates power by driving the engine. The power generated by the alternator 410 by driving the engine can be supplied to the first secondary battery 130, the second secondary battery 430, and the load 440 included in the assembled battery 100 by adjusting the output voltage with a regulator. The alternator 410 can generate power by regeneration when the vehicle is decelerated. The electric power regenerated by the alternator 410 is used to charge the first secondary battery 130 and the second secondary battery 430.

  The starter 420 includes, for example, a cell motor, and receives power supply from at least one of the first secondary battery 130 and the second secondary battery 430 to start the engine of the vehicle.

  The second secondary battery 430 is composed of, for example, a lead storage battery and supplies power to the load 440.

  The load 440 includes, for example, an audio, an air conditioner, and a navigation system provided in the vehicle, and operates by consuming the supplied power. The load 440 operates by receiving power supply from the first secondary battery 130 while the engine driving is stopped, and operates by receiving power supply from the alternator 410 and the second secondary battery 430 while driving the engine.

  Switch 450 is connected in series with starter 420. The switch 450 connects or disconnects the starter 420 in parallel with other components.

  The control unit 460 controls the overall operation of the power supply system 400. The control unit 460 is configured by, for example, an ECU (Electric Control Unit or Engine Control Unit) of the vehicle. The control unit 460 controls the operation of the switch 450, the MOSFET 210, and the relay 220, respectively, and supplies power by the alternator 410, the first secondary battery 130, and the second secondary battery 430, and the first secondary battery 130. The second secondary battery 430 is charged.

  Next, a detailed configuration of the assembled battery 100 will be described with reference to FIGS. 4 is an exploded perspective view of the battery pack of FIG. However, in FIG. 4, as in FIG. 1, some parts are simplified. FIG. 5 is an external perspective view of the lower case 110, and FIG. 6 is a top view of the lower case 110. FIG. 7 is an external perspective view of the cell holder 120. 7A is an external perspective view from the upper surface side of the cell holder 120, and FIG. 7B is an external perspective view from the opposite side (hereinafter also referred to as “lower surface side”) of the cell holder 120. It is. FIG. 8 is an external perspective view showing a state where the cell holder 120 is attached to the lower case 110. FIG. 9 is an enlarged external perspective view of the inter-cell bus bar 160 attached to the cell holder 120. FIG. 10 is a diagram schematically illustrating the bonding positions of the battery cell 150, the lower case 110, and the cell holder 120 in the assembled battery 100. FIG. 11 is a diagram schematically illustrating a state before and after the engagement claw 205 of the cell holder 120 and the engagement hole 115 of the lower case 110 are engaged. FIG. 12 is a top view of the cell holder 120 showing a state in which the substrate of the LBC 140 is fixed to the cell holder 120 by fastening together. FIG. 13 is an external perspective view of the auxiliary machine pedestal 200, and FIG. 14 is a side view of the auxiliary machine pedestal 200 viewed from one side. FIG. 14A is a side view of the auxiliary machine base 200 only, and FIG. 14B is a side view of the auxiliary machine base 200 with components such as the relay 220 mounted thereon. FIG. 15 is an external perspective view of the auxiliary machine base 200 showing a state in which the components and the bus bar are attached. FIG. 16 is a top view of the auxiliary machine base 200 showing a state in which the components and the bus bar are fixed by the nut 290. FIG. 17 is a view showing how the assembled battery is assembled, and FIG. 18 is a view for explaining how the battery module group and the auxiliary module group are assembled.

  The assembled battery 100 according to the present embodiment is assembled by assembling the battery module group and the accessory module group, then assembling the battery module group and the accessory module group, and fixing the upper case.

  The battery module group includes a battery cell 150, a lower case 110 that houses the battery cell 150, a cell holder 120 that holds the battery cell 150, an inter-cell bus bar 160, a total positive terminal bus bar 164, and a total negative terminal bus bar 165. , And LBC 140 are assembled. In the present embodiment, the LBC 140 is a substrate, and the LBC 140 is hereinafter also referred to as an LBC substrate 140.

  In this embodiment, the battery cell 150 with which the assembled battery 100 is provided has a substantially rectangular parallelepiped shape. Although the assembled battery 100 of this embodiment accommodates five battery cells 150, the number of battery cells 150 that can be accommodated by the assembled battery 100 is not limited to five. The number of battery cells 150 that can be accommodated in the assembled battery 100 is appropriately determined according to the maximum output of the battery cells 150 and the power consumed by a driven device such as a vehicle.

  As shown in FIG. 5, the lower case 110 is a housing having a space 110 a that can accommodate the battery cells 150 from the upper surface side. That is, the lower case 110 has a bottom surface 111 and four side surfaces 112a, 112b, 112c, and 112d, and an opening 113 on the opposite side (that is, the top surface side) of the bottom surface 111. In the lower case 110, the side surfaces 112a and 112c face each other, and the side surfaces 112b and 112d face each other. Hereinafter, when the four side surfaces 112a, 112b, 112c, and 112d are not distinguished, they are collectively referred to as the side surface 112. The height of the side surface 112 is lower than the height of the battery cell 150 accommodated in the lower case 110.

  The side surfaces 112b and 112d include an attachment mechanism 114 for attaching the assembled battery 100 to the vehicle outside the lower case 110 (that is, on the opposite side of the space 110a). The attachment mechanism 114 is appropriately determined in shape and position on the side surfaces 112b and 112d in accordance with the attachment method with the vehicle.

  The side surface 112 has an engagement hole 115 for engagement with the cell holder 120 on the opening 113 side. In the present embodiment, each side surface 112 has three engagement holes 115 in the center on the opening 113 side and in the vicinity of both ends.

  The bottom surface 111 includes a guide 116 for indicating the position of the battery cell 150 to be accommodated and preventing the displacement of the battery cell 150 to be accommodated inside the lower case 110 (that is, on the space 110a side). The guide 116 also has a function of maintaining the space between the battery cells 150. For example, an insulating sheet or the like may be inserted in the space between the battery cells 150 formed by the guide 116.

  The height of the guide 116 is lower than the height of the side surface 112. In the present embodiment, four guides 116 are provided at equal intervals in parallel to the side surfaces 112b and 112d. That is, in the present embodiment, the lower case 110 accommodates five battery cells 150 arranged so as to be stacked from the side surface 112b to the side surface 112d along each region of the bottom surface 111 divided into five by the guide 116. To do.

  In general, in the manufacture of the lower case 110, the side surfaces 112a and 112c without the attachment mechanism 114 are less likely to cause dimensional errors than the side surfaces 112b and 112d with the attachment mechanism 114. Therefore, the battery cells 150 accommodated in the lower case 110 are stacked in the lower case 110 by arranging the battery cells 150 so as to be stacked in the direction along the side surfaces 112a and 112c as in the present embodiment. It becomes difficult to slip.

  Note that the position, size, and the like of the guide 116 are appropriately determined according to the shape, quantity, and the like of the battery cell 150 that the lower case 110 accommodates.

  The battery cell 150 has a positive electrode terminal 152 and a negative electrode terminal 153 on one cap surface 151 having a substantially rectangular parallelepiped shape. The cap surface 151 has a rectangular shape having a long side and a short side, and the positive electrode terminal 152 and the negative electrode terminal 153 are provided near both ends of the cap surface 151 in the long side direction. In addition, a safety valve that is opened at the center of the cap surface 151 to discharge gas to the outside when gas is generated inside the battery cell 150 due to aging, thermal runaway, or the like and the pressure inside the battery cell 150 exceeds a predetermined value. 154 is provided. The battery cell 150 is accommodated in the lower case 110 so that the cap surface 151 protrudes from the opening 113, that is, on the upper surface side. As shown in FIG. 4, in the lower case 110, the battery cell 150 is accommodated in the lower case 110 such that the arrangement of the positive electrode terminal 152 and the negative electrode terminal 153 of the battery cells 150 adjacent to each other is reversed. The

  The cell holder 120 is attached to the cap surface 151 side of the battery cell 150, that is, the opening 113 side of the lower case 110.

  The cell holder 120 is substantially rectangular in a top view, and holds the battery cell 150 from the upper surface side in a state where the cell holder 120 is engaged with the lower case 110 inside the outer peripheral frame 121 having a predetermined height and inside the outer peripheral frame 121. And a holding lid 122. The holding lid 122 holds the cap surface 151 of the battery cell 150 accommodated in the lower case 110 from the upper surface side.

  The outer peripheral frame 121 has four side surfaces 121a, 121b, 121c, and 121d. The four side surfaces 121a, 121b, 121c and 121d are arranged at positions corresponding to the four side surfaces 112a, 112b, 112c and 112d of the lower case 110, respectively, in a state where the outer peripheral frame 121 and the lower case 110 are engaged. The

  The outer peripheral frame 121 includes screw hole forming portions 123 having screw holes 123a for fixing the accessory base 200 to the cell holder 120 by screwing at the ends of the side surfaces 121b and 121d. The outer peripheral frame 121 is formed so as to protrude outward from the side surfaces 121b and 121d. In the screw hole forming portion 123, the screw hole 123a is formed so that a screw can be inserted from the upper surface side.

  In addition, the outer peripheral frame 121 is used for screwing bus bars (that is, total plus copper bus bars 285 and total minus copper bus bars 286 described later) to the cell holder 120 on the upper surfaces of the side surfaces 121b and 121d. It has a screw hole 123b. The screw holes 123b are preferably provided in the vicinity of an opening 124a to which a total plus terminal bus bar 164 and a total minus terminal bus bar 165 described later are attached.

  The holding lid 122 has an opening 124 a at a position corresponding to the positive terminal 152 and the negative terminal 153 of the battery cell 150 when the cell holder 120 and the lower case 110 are engaged. That is, as shown in FIG. 8, in the engaged state between the cell holder 120 and the lower case 110, the positive terminal 152 and the negative terminal 153 of the battery cell 150 are exposed from the opening 124 a to the upper surface side of the holding lid 122. .

  In addition, the holding lid 122 has an opening 124 b at a position corresponding to the safety valve 154 of the battery cell 150 when the cell holder 120 and the lower case 110 are engaged. That is, as shown in FIG. 8, in the engaged state between the cell holder 120 and the lower case 110, the gas discharged from the safety valve 154 is discharged from the opening 124a to the outside of the battery cell 150.

  The positive electrode terminal 152 and the negative electrode terminal 153 that are exposed from the opening 124 a and are aligned in a row are adjacent to each other except for the positive electrode terminal 152 connected to the fusible link 240 and the negative electrode terminal 153 connected to the GND terminal 270. Are electrically connected by the inter-cell bus bar 160. The inter-cell bus bar 160 is made of a conductive metal such as aluminum. The inter-cell bus bar 160 has a convex portion 161 for avoiding interference with the frame portion 122a of the holding lid 122 between the openings 124a in a state where the inter-cell bus bar 160 is connected to the positive electrode terminal 152 and the negative electrode terminal 153. Have. That is, the inter-cell bus bar 160 protrudes from the terminal connection part 162 connecting the two terminal connection parts 162 and the two terminal connection parts 162 connected to the positive electrode terminal 152 and the negative electrode terminal 153 to the upper surface side in a side view. And a convex portion 161.

  For example, as shown in FIG. 9, the terminal connecting portion 162 has a welding opening 162a at the center. The inter-cell bus bar 160 and the later-described total plus terminal bus bar 164 and total minus terminal bus bar 165 are connected to each terminal of the battery cell 150 by bead welding at the periphery of the welding opening 162a.

  Each terminal connection portion 162 has a voltage sensor attachment terminal 163 that protrudes toward the opening 124b when attached to the cell holder 120. Each voltage sensor attachment terminal 163 has a screw hole 163a. In the inter-cell bus bar 160, each voltage sensor mounting terminal 163 is arranged on a screw hole forming portion 126 described later when the terminal connection portion 162 of the inter-cell bus bar 160 is connected to the positive terminal 152 or the negative terminal 153. Is formed. The screw hole 163a overlaps with the screw hole 126a formed in the screw hole forming portion 126 in a state where the voltage sensor mounting terminal 163 is disposed on the screw hole forming portion 126, and is screwed to the screw hole 126a by screwing the LBC substrate 140. And the screw hole 163a are screwed together (fastened together). The voltage sensor attachment terminal 163 is connected to the voltage sensor and used to detect a voltage between the terminals.

  Further, the total positive terminal bus bar 164 is connected to the positive terminal 152 connected to the fusible link 240, and the total negative terminal bus bar 165 is connected to the negative terminal 153 connected to the GND terminal 270. The total plus terminal bus bar 164 and the total minus terminal bus bar 165 are made of a conductive metal such as aluminum. The total plus terminal bus bar 164 and the total minus terminal bus bar 165 include one terminal connection part 162 and an external connection part 166 for connecting to the total plus copper bus bar 285 and the total minus copper bus bar 286 provided in the auxiliary machine base 200, respectively. Have. The external connection portion 166 has a convex shape that protrudes to the upper surface side of the terminal connection portion 162 so as to sandwich the inner surface and the outer surface of the outer peripheral frame 121. In particular, as shown in FIG. 17, the external connection portion 166 is attached along a bus bar support portion 123 c formed from the inner surface to the outer surface of the outer peripheral frame 121. Moreover, the external connection part 166 has the screw hole 166a in the position corresponding to the screw hole 123b in the state attached to the outer periphery frame 121. As shown in FIG. Note that the terminal connection portions 162 of the total plus terminal bus bar 164 and the total minus terminal bus bar 165 also have a voltage sensor mounting terminal 163 that protrudes toward the opening 124b when mounted on the cell holder 120.

  The holding lid 122 prevents electrical connection between the bus bars between the inter-cell bus bars 160 attached to the cell holder 120 and between the inter-cell bus bar 160 and the total plus terminal bus bar 164 or the total minus terminal bus bar 165. And a bead 125 for positioning the bus bar. The bead 125 projects to the upper surface side of the holding lid 122.

  Further, the holding lid 122 includes a screw hole forming portion 126 for fixing the LBC substrate 140 on the upper surface side. The screw hole forming portion 126 is formed between the opening 124 a and the opening 124 b on the upper surface side of the holding lid 122. That is, in the present embodiment, the holding lid 122 includes ten screw hole forming portions 126. The screw hole forming portion 126 has a substantially cylindrical shape, and a screw hole 126a is provided at the center. The LBC substrate 140 is mounted on the upper surface side of the cell holder 120 and is fastened together with the intercell bus bar 160 to the cell holder 120 from the upper surface side using the screw holes 126a formed in the screw hole forming portion 126.

  In addition, the holding lid 122 includes a rib 127 for preventing displacement of the battery cell 150 accommodated in the lower case 110 on the lower surface side. Four ribs 127 are provided at equal intervals in parallel to the side surfaces 121b and 121d. That is, the rib 127 of the holding lid 122 is provided in a direction and position corresponding to the guide 116 of the lower case 110 in a state where the cell holder 120 and the lower case 110 are engaged.

  The outer peripheral frame 121 has an engagement insertion portion 121e having a predetermined height over the entire circumference. The engagement insertion portion 121e is thinner than other portions of the outer peripheral frame 121. Therefore, the outer surface of the outer peripheral frame 121 has an engagement insertion portion 121e that is thinner than other portions of the outer peripheral frame 121. It is depressed. As shown in FIG. 11B, the engaging insertion portion 121 e is inserted inside the lower case 110 on the opening 113 side of the lower case 110 when the cell holder 120 is engaged with the lower case 110.

  In each of the side surfaces 121a, 121b, 121c, and 121d, the engagement insertion portion 121e includes three engagement claws 128 at the center and in the vicinity of both ends. The engagement claw 128 is provided at a position corresponding to the engagement hole 115 of the lower case 110. When the cell holder 120 and the lower case 110 are engaged, the engagement claw 128 of the cell holder 120 is fitted into the engagement hole 115 of the lower case 110 to be engaged, whereby the cell holder 120 and the lower case 110 are engaged. Combined. The positions and quantities of the engagement holes 115 and the engagement claws 128 are not limited to the examples shown in the present embodiment, and can be determined as appropriate positions and quantities.

  The outer peripheral frame 121 includes an engagement hole 129a on the upper surface side of the side surfaces 121a and 121c and in the vicinity of the screw hole 123b. The engagement hole 129a is provided so as to protrude outward from the outer peripheral frame 121, and is a substantially rectangular hole when viewed from above. The engagement hole 129a is used when the cell holder 120 and the auxiliary machine base 200 are assembled.

  Further, the outer peripheral frame 121 includes an engagement hole 129b on the upper surface side near the center of each of the side surfaces 121a, 121b, 121c and 121d. The engagement hole 129b is provided so as to protrude outward from the outer peripheral frame 121, and is a substantially rectangular hole in a top view. The engagement hole 129b is used when the cell holder 120 and the upper case are assembled. Note that the engagement hole 129b is not necessarily provided near the center of each of the side surfaces 121a, 121b, 121c, and 121d, and may be provided at any position as long as the upper case described later can be engaged. It may be.

  Here, the assembly of the battery module group will be described. First, an adhesive is applied to the battery cell 150. The adhesive is an arbitrary adhesive capable of bonding the battery cell 150, the lower case 110, and the cell holder 120. For example, an epoxy-based adhesive can be used. When the cell holder 120 and the lower case 110 are engaged with each other, it is only necessary that the position of the battery cell 150 is fixed in the lower case 110, so that the adhesive is not necessarily applied to the entire battery cell 150. It may be applied to a part of the battery cell 150. For example, in the battery cell 150, the adhesive is a battery cell that contacts the bottom surface 111 when the battery cell 150 is inserted into the lower case 110 (that is, the surface opposite to the cap surface 151) and the cell holder 120 from the top surface side. It may be applied to the surface (that is, the cap surface 151) that contacts the holding lid 122 when holding 150. In particular, since the cap surface 151 includes the positive electrode terminal 152, the negative electrode terminal 153, and the safety valve 154, for example, the cap surface 151 of the cap surface 151 is prevented from being coated with the positive electrode terminal 152, the negative electrode terminal 153, and the safety valve 154. The adhesive may be applied only to the peripheral edge in the longitudinal direction.

  10 shows a surface of the battery cell 150 that contacts the bottom surface 111 when the battery cell 150 is inserted into the lower case 110 and a surface that contacts the holding lid 122 when the cell holder 120 holds the battery cell 150 from the upper surface side. It is a figure which shows typically the adhesion position when an adhesive agent is applied to (that is, cap surface 151). FIG. 10 is a cross-sectional view taken along the line AA in FIG. 8, and particularly shows only the central battery cell 150 and its periphery among the five stacked battery cells 150. Moreover, in FIG. 10, the area | region where an adhesive agent is apply | coated is shown with the hatching. In this case, as shown in FIG. 10, the battery cell 150 is bonded to the cell holder 120 around the intersection of the holding lid 122 and the rib 127, and is bonded to the lower case 110 on the bottom surface 111.

  In addition, what is apply | coated between the battery cell 150 and the bottom face 111 of the lower case 110 is not restricted to an adhesive agent. Another filler may be applied between the battery cell 150 and the bottom surface 111. The filler is particularly preferably elastic. By applying an elastic filler between the battery cell 150 and the bottom surface 111, the filler absorbs vibration generated when the vehicle including the assembled battery 100 travels, so that vibration is hardly transmitted to the battery cell 150.

  Next, in a state where the cell holder 120 is turned upside down, the cap surface 151 of the battery cell 150 is turned downward, and the battery cell 150 is inserted into the lower surface side of the holding lid 122 of the cell holder 120 according to the rib 127. Then, with the lower case 110 turned upside down, the lower case 110 is engaged with the cell holder 120 so as to cover the cell holder 120 into which the battery cell 150 is inserted. At this time, as shown in FIGS. 11A and 11B, the engagement claw 128 of the cell holder 120 is engaged with the engagement hole 115 of the lower case 110. An example of a state in which the cell holder 120 and the lower case 110 are engaged is shown in FIG.

  In addition, the adhesion | attachment procedure of the battery cell 150 is not restricted to the said procedure. For example, the battery cell 150 may be inserted into the space 110a of the lower case 110 without causing the lower case 110 and the cell holder 120 to be turned upside down, and the cell holder 120 may be engaged with the lower case 110 from above.

  Then, inter-cell bus bar 160, total plus terminal bus bar 164, and total minus terminal bus bar 165 are attached to each terminal of battery cell 150 exposed from opening 124a of holding lid 122 by bead welding, and LBC substrate 140 is attached to holding lid 122. By attaching, the assembly of the battery module group is completed. As described above, the LBC substrate 140 is attached to the holding lid 122 by, for example, fastening together with the inter-cell bus bar 160.

  FIG. 12 is a top view of the cell holder 120 showing a state in which the LBC substrate 140 is fixed to the cell holder 120 by fastening together. In FIG. 12, the LBC substrate 140 is shown in a transparent state for explanation.

  As shown in FIG. 12, the LBC substrate 140 is fixed to the cell holder 120 by being fastened together with the fastening point (screw hole 163a) of the inter-cell bus bar 160. In the present embodiment, the inter-cell bus bar 160 includes two fastening points, and is fastened to the cell holder 120 together with the LBC substrate 140 by being fastened together at the two fastening points. In the present embodiment, the bolt that fastens the inter-cell bus bar 160 and the LBC substrate 140 together is preferably a loosening prevention bolt such as an SL bolt or a seal bolt.

  In the present embodiment, all four inter-cell bus bars 160 have the same shape. The two fastening points of the inter-cell bus bar 160 are arranged at positions symmetrical with respect to a bisector (indicated by a broken line in FIG. 12) of two electrode terminals that are electrically connected in a top view. In each inter-cell bus bar 160, at least one of the plurality of fastening points is joined to the LBC substrate 140 as a voltage detection line.

  In the present embodiment, the welded portion of the inter-cell bus bar 160, that is, the welding opening 162a is exposed from the LBC substrate 140 in a top view. Since the welded portion is exposed from the LBC substrate 140, in the manufacturing process of the assembled battery 100, an operator can easily visually confirm whether the inter-cell bus bar 160 is appropriately welded.

  In the present embodiment, more than half of the area of the inter-cell bus bar 160 in the top view is exposed from the LBC substrate 140. Thus, the heat dissipation of the inter-cell bus bar 160 is improved by setting the area of the portion exposed from the LBC substrate 140 in the inter-cell bus bar 160 to be half or more of the area in the top view.

  In the present embodiment, in particular, the ratio of the area of the exposed portion from the LBC substrate 140 to the area of the four inter-cell bus bars 160 in the top view of the inter-cell bus bars 160 is the same. In other words, for the four inter-cell bus bars 160, the ratio of the area covered by the LBC substrate 140 is the same as the area of the inter-cell bus bar 160 in a top view. Thus, by making the ratio of the area of the exposed part in the four inter-cell bus bars 160 the same, it is possible to suppress variation in heat dissipation between the inter-cell bus bars 160. Thereby, the dispersion | variation in the temperature of each battery cell 150 can be suppressed, and it becomes easy to suppress the dispersion | variation in deterioration of the battery cell 150. FIG.

  In addition, the ratio of the area of the exposed part from the LBC board | substrate 140 with respect to the area in the top view of the intercell bus bar 160 does not necessarily need to be completely the same among each intercell bus bars 160. The ratio of the area of the exposed portion from the LBC substrate 140 to the area of the inter-cell bus bar 160 in a top view may be substantially the same. Here, the ratio of the area of the exposed portion is substantially the same includes the range of the area ratio in which the heat dissipation between the inter-cell bus bars 160 is within a predetermined range.

  Also, the positional relationship between the total plus terminal bus bar 164 and the total minus terminal bus bar 165 and the LBC substrate 140 can be the same as the positional relationship between the inter-cell bus bar 160 and the LBC substrate 140.

  Next, the auxiliary machine module group of the assembled battery 100 according to the present embodiment will be described. The auxiliary equipment module group electrically connects the auxiliary equipment base 200, the MOSFET 210, the relay 220, the current sensor 230 and the fusible link 240 arranged on the auxiliary equipment base 200, and each component arranged on the auxiliary equipment base 200. It is configured by assembling a copper bus bar for connection to the cable.

  The auxiliary machine base 200 has four side surfaces 200a, 200b, 200c and 200d, and a placement surface 201. The four side surfaces 200a, 200b, 200c, and 200d are the four side surfaces 112a, 112b, 112c, and 112d (and the four side surfaces of the cell holder 120) of the lower case 110, respectively, in a state where the auxiliary machine base 200 is assembled to the battery module group. 121a, 121b, 121c and 121d).

  On the mounting surface 201, a current sensor 230 is mounted near the side surface 200a, a MOSFET 210 is mounted near the side surface 200b, a relay 220 is mounted near the side surface 200c, and a fusible link 240 is mounted near the side surface 200d. . As shown in FIG. 13, the mounting surface 201 is formed with unevenness according to the position where the MOSFET 210, the relay 220, the current sensor 230 and the fusible link 240 are mounted. The mounting surface 201 has higher rigidity due to the unevenness than when there is no unevenness.

  In the present embodiment, as shown in FIG. 13, the unevenness of the mounting surface 201 includes the region 201c on the mounting surface 201 where the relay 220 is mounted, the region 201a where the current sensor 230 is mounted, and the MOSFET 210. It is formed so as to be at a higher position when the assembled battery 100 is assembled as compared to the area 201b to be placed and the area 201d to which the fusible link 240 is placed. Further, the unevenness of the mounting surface 201 is formed so that the region 201d where the fusible link 240 is mounted is at a higher position when the assembled battery 100 is assembled than the regions 201a and 201b. Yes. That is, the unevenness of the placement surface 201 is formed such that the region 201a where the current sensor 230 is placed is at a lower position than the region 201c and the region 201d. Since the mounting surface 201 has such irregularities, the fusible link 240 is disposed at a position lower than the relay 220 in the auxiliary machine base 200, and the current sensor 230 thicker than the fusible link 240 is also connected to the relay 220. Can be arranged at a lower position.

  The current sensor 230, the MOSFET 210, the relay 220, and the fusible link 240 are respectively formed by standing walls formed by unevenness of the mounting surface 201 or ribs 202 formed on the mounting surface 201 in the regions 201a, 201b, 201c, and 201d. Is positioned.

  In the present embodiment, for example, as shown in FIGS. 13 and 15, the region 201 c is partially surrounded by a rib 202. That is, the relay 220 is positioned by the rib 202. The rib 202 also has a function of preventing rotation when the relay 220 is fixed to the auxiliary machine base 200 with the nut 290. The rib 202 also has an insulating function for preventing contact between copper bus bars, which will be described later.

  Further, the MOSFET 210, the relay 220, and the fusible link 240 are positioned by standing walls formed in parts around the areas 201a, 201b, and 201d, respectively. The standing wall on the mounting surface 201 also has a function of preventing rotation when the MOSFET 210, the relay 220, and the fusible link 240 are fixed to the auxiliary machine base 200 with the nut 290.

  The auxiliary machine base 200 includes a plurality of upward studs 203 on the mounting surface 201. The stud 203 is used to electrically connect the battery cells 150 of the battery module group, the MOSFET 210, the relay 220, the current sensor 230, and the fusible link 240 to each other. Further, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 also extend upward from the placement surface 201 and function as studs.

  Each stud 203, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 are provided at an appropriate height on the mounting surface 201 having unevenness. For example, each stud 203 has a height matching the terminals of the current sensor 230, the MOSFET 210, the relay 220, and the fusible link 240 placed on each of the regions 201 a, 201 b, 201 c, and 201 d on the placement surface 201. Provided. That is, the diameter of each stud 203 is sized according to the connection opening provided in each terminal of the current sensor 230, MOSFET 210, relay 220, and fusible link 240, and the current sensor 230, MOSFET 210, relay 220. The fusible link 240 is attached to the accessory base 200 by passing the stud 203 from the upper surface side to the terminal connection opening. Thus, by making the direction of each stud 203 upward, it is easy to attach each part to the auxiliary machine base 200, and thus the productivity of the auxiliary machine module and the assembled battery 100 is improved.

  In the present embodiment, the GND terminal 270 is provided at a position lower than the SSG terminal 250 and the LOAD terminal 260. In this way, by changing the height of the GND terminal 270, the SSG terminal 250, and the LOAD terminal 260, the GND terminal 270 can be identified more easily, thereby preventing erroneous wiring when the assembled battery 100 is mounted on a vehicle. It becomes easy.

  Here, wiring of each component using a copper bus bar on the auxiliary machine base 200 will be described. As shown in FIGS. 15 and 16, the copper bus bars 280 to 284 have various shapes according to the positions where they are arranged along the unevenness of the mounting surface 201 of the auxiliary machine base 200.

  Terminal 240 b of fusible link 240 is electrically connected to terminal 230 a of current sensor 230 via copper bus bar 280. The other terminal 230 b of the current sensor 230 is electrically connected to the terminal 220 a of the relay 220 via the copper bus bar 281. The other terminal 220 b of the relay 220 is electrically connected to the terminal 210 a of the MOSFET 210 via the copper bus bar 282. The other terminal 220 b of the relay 220 is further electrically connected to the SSG terminal 250 via the copper bus bars 282 and 283. The terminal 210 b of the MOSFET 210 is electrically connected to the LOAD terminal 260 via the copper bus bar 284.

  The terminal 240a of the fusible link 240 is connected to a total plus copper bus bar 285 for electrical connection to the total plus terminal bus bar 164 of the battery module group. The GND terminal 270 is connected with a total minus copper bus bar 286 for electrically connecting to the total minus terminal bus bar 165 of the battery module group. The total plus copper bus bar 285 and the total minus copper bus bar 286 extend to the lower surface side along the side surfaces 200b and 200d, respectively, and the tips of the total plus copper bus bar 286 and the auxiliary base 200 and the cell holder 120 are assembled to the total plus terminal, respectively. Contact with the bus bar 164 and the total negative terminal bus bar 165 ensures electrical connection. The total plus copper bus bar 285 and the total minus copper bus bar 286 are respectively screw holes at positions corresponding to the screw holes 123b provided in the cell holder 120 in a state where the auxiliary machine base 200 and the cell holder 120 are assembled at the tips. 285a and 286a.

  The copper bus bars 280 to 284 and the total plus copper bus bar 285 are fixed to the auxiliary machine base 200 together with the MOSFET 210, the relay 220, the current sensor 230 and the fusible link 240 by a nut 290 screwed to the stud 203 from the upper surface side. . The relay 220 can also be attached to the auxiliary machine base 200 by passing an opening 221 provided at a position different from the terminals 220a and 220b through the stud 203 and screwing the nut 290 into the stud 203 from the upper surface side. Fixed.

  Note that, as described above, the copper bus bars are arranged so as not to contact each other by the ribs 202 provided on the auxiliary machine base 200. Moreover, the partition 222 provided in the terminal 220a and the terminal 220b of the relay 220 also has a function of insulating the copper bus bars so that they do not contact each other.

  The auxiliary machine pedestal 200 includes a screw hole forming part 204 having screw holes 204a for fixing the cell holder 120 and the auxiliary machine pedestal 200 by screwing at the ends of the side surfaces 200b and 200d. The screw hole 204a is provided at a position corresponding to the screw hole 123a provided in the cell holder 120 in a state where the cell holder 120 and the auxiliary machine base 200 are assembled.

  The auxiliary machine base 200 includes engagement claws 205 in the vicinity of the stud 203 to which the total plus copper bus bar 285 on the side surface 200a is attached and in the vicinity of the GND terminal 270 to which the total minus copper bus bar 286 on the side surface 200c is attached. The engagement claw 205 is provided at a position corresponding to the engagement hole 129a in a state where the cell holder 120 and the auxiliary machine base 200 are assembled. The engaging claw 205 extends from the outside of the side surfaces 200a and 200c toward the lower surface, and the front end of the engaging claw 205 has a wedge shape when viewed from the side. When the tip of the engagement claw 205 is fitted into the engagement hole 129a, the engagement claw 205 and the engagement hole 129a are engaged.

  Here, the assembly of the accessory module group will be described. In the assembly of the accessory module group, first, each component (ie, MOSFET 210, relay 220, current sensor 230, fusible link 240) and copper bus bar (ie, copper bus bar 280 to 284, total plus copper bus bar 285, and total minus copper). The bus bar 286) is disposed through the stud 203, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 of the mounting surface 201 of the auxiliary machine base 200. Then, the auxiliary machine module group is assembled by screwing the nut 290 into the stud 203, the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 from the upper surface side.

  Next, the upper case will be described. As shown in FIG. 17, the upper case 300 has three openings 310a and 310b for exposing the SSG terminal 250, the LOAD terminal 260, and the GND terminal 270 to the outside from the upper case 300 when the assembled battery 100 is assembled. And 310c.

  Further, the upper case 300 includes engagement claws 320 for engaging with the cell holder 120 on the lower surfaces of the four side surfaces. The engagement claw 320 is provided at a position corresponding to the engagement hole 129b in a state where the cell holder 120 and the upper case 300 are assembled. The engaging claw 320 extends in the lower surface direction from the outer side of each side surface, and the front end portion of the engaging claw 320 has a wedge shape in a side view. When the tip of the engagement claw 320 is fitted into the engagement hole 129b, the engagement claw 320 and the engagement hole 129b are engaged.

  Further, the upper case 300 includes a bus bar protection unit 330 for protecting the total plus copper bus bar 285 and the total minus copper bus bar 286 in a state where the cell holder 120 and the upper case 300 are assembled.

  Next, assembly of the assembled battery 100 as a whole will be described. First, assembly of the battery module group and the accessory module group will be described. The assembly of the battery module group and the accessory module group is realized by the assembly of the cell holder 120 and the accessory base 200.

  The cell holder 120 and the auxiliary machine base 200 are assembled by fitting the engaging claws 205 into the engaging holes 129a and engaging them. In addition, the cell holder 120 and the auxiliary machine pedestal 200 are configured such that, in a state where the auxiliary machine pedestal 200 is placed on the cell holder 120, the bolt 340 is screwed into the screw hole 285a or the screw hole 286a from the outside of the side surfaces 200b and 200d It is assembled by passing through the hole 166a and screwed into the screw hole 123b. That is, the cell holder 120 and the auxiliary machine base 200 are indirectly assembled by the bolt 340 via the total plus copper bus bar 285 and the total minus copper bus bar 286. At this time, the support portion 206 provided along the total plus copper bus bar 285 and the total minus copper bus bar 286 has a function of preventing rotation.

  In this way, by performing assembly by both means of assembly by engagement and assembly by the bolt 340, a more robust assembly can be realized as compared with the case of assembly by one side.

  Further, the cell holder 120 and the auxiliary machine pedestal 200 are formed in such a manner that, in the state where the cell holder 120 is placed on the auxiliary machine pedestal 200, as shown in FIG. It is assembled by screwing to 123a.

  Since the battery module group and the auxiliary machine module group of the present embodiment are assembled as described above, the battery module group and the auxiliary machine module group are fixed at the four corners of the substantially rectangular auxiliary machine base 200 in a top view. . Thereby, a robust assembly can be realized.

  Next, assembly of the upper case 300 will be described. The upper case 300 is engaged with the cell holder 120 by engaging the engagement claw 320 with the engagement hole 129 b of the cell holder 120. Thus, the assembly of the assembled battery 100 is completed by engaging the upper case 300 with the cell holder 120.

  Thus, according to the assembled battery 100 according to the present embodiment, at least a part of all the inter-cell bus bars 160 is exposed from the LBC substrate 140 in a top view. Therefore, according to the assembled battery 100, the heat dissipation of all the inter-cell bus bars 160 can be ensured, and the heat dissipation of the assembled battery 100 as a whole can be improved. Moreover, the assembled battery 100 can prolong the lifetime by improving heat dissipation. Moreover, according to the assembled battery 100, since the possibility of a contact with the LBC board | substrate 140 and the inter-cell bus bar 160 which is a metal component can be reduced, the danger of a short circuit can be reduced and it becomes easy to ensure insulation.

  Further, according to the assembled battery 100, the welded portion of the inter-cell bus bar 160 is exposed from the LBC substrate 140 in a top view. Therefore, in the manufacturing process of the assembled battery 100, the operator can easily visually confirm whether the inter-cell bus bar 160 is properly welded.

  In addition, according to the assembled battery 100, more than half of the area of the inter-cell bus bar 160 in the top view is exposed from the LBC substrate 140, so that a larger area is covered with the LBC substrate 140. Thus, the heat dissipation of the inter-cell bus bar 160 is improved.

  Moreover, according to the assembled battery 100, the ratio of the area of the exposed part from the LBC board | substrate 140 with respect to the area in the top view of the inter-cell bus bar 160 is the same about the four inter-cell bus bars 160. Therefore, variation in heat dissipation between the inter-cell bus bars 160 can be suppressed, so that variation in temperature of each battery cell 150 can be suppressed, and as a result, variation in deterioration of the battery cell 150 can be easily suppressed.

  Moreover, according to the assembled battery 100, each inter-cell bus bar 160 is fastened together at two fastening points. Therefore, in the battery pack 100, each battery cell 150 is supported by bolts at all fastening points. Thereby, the support strength of the battery cell 150 can be improved. As a result, it becomes easy to ensure long-term reliability of the assembled battery 100.

  Moreover, in the assembled battery 100, since all four inter-cell bus bars 160 have the same shape, it is possible to share components (inter-cell bus bars 160). Further, the two fastening points of the inter-cell bus bar 160 are arranged at positions symmetrical with respect to the bisector of the two electrode terminals to be electrically connected in a top view, and at least one of the plurality of fastening points. Are bonded to the LBC substrate 140 as voltage detection lines. Therefore, according to the assembled battery 100, the cell voltage of the battery cell 150 can be detected at any of the fastening points in each inter-cell bus bar 160.

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each means can be rearranged so as not to be logically contradictory, and a plurality of means can be combined into one or divided.

  For example, in the above embodiment, the battery pack 100 has been described as including five battery cells 150, but the number of battery cells 150 is not limited to five. Further, the number of inter-cell bus bars 160 provided in the assembled battery 100 is appropriately determined according to the number of battery cells 150 included in the assembled battery 100.

  Further, the number of fastening points can be any number of two or more in each inter-cell bus bar 160. The support strength of the battery cell 150 can be improved as the number of fastening points increases.

100 assembled battery 110 lower case 110a space 111 bottom surface 112, 112a, 112b, 112c, 112d, 121a, 121b, 121c, 121d, 200a, 200b, 200c, 200d side surface 113, 124a, 124b, 221, 310a, 310b, 310c opening 114 Mounting mechanism 115, 129a, 129b Engagement hole 116 Guide 120 Cell holder 121 Outer peripheral frame 121e Engagement insertion part 122 Holding lid 122a Frame part 123, 126, 204 Screw hole formation part 123a, 123b, 126a, 163a, 166a, 204a, 285a, 286a Screw hole 123c Bus bar support part 125 Bead 127, 202 Rib 128, 205, 320 Engagement claw 130 First secondary battery 140 LBC (secondary battery controller) base Plate 150 Battery cell 151 Cap surface 152 Positive electrode terminal 153 Negative electrode terminal 154 Safety valve 160 Inter-cell bus bar 161 Protruding portion 162 Terminal connection portion 162a Welding opening 163 Voltage sensor mounting terminal 164 Total plus terminal bus bar 165 Total minus terminal bus bar 166 External connection portion 200 Auxiliary machine base 201 Placement surface 201a, 201b, 201c, 201d Area 203 Stud 206 Support part 210 MOSFET
210a, 220a, 230a, 240a, 210b, 220b, 230b, 240b Terminal 220 Relay 222 Bulkhead 230 Current sensor 240 Fusible link 250 SSG terminal 260 LOAD terminal 270 GND terminal 280, 281, 282, 283, 284 Copper bus bar 285 Total plus Copper bus bar 286 Total minus copper bus bar 290 Nut 300 Upper case 330 Bus bar protection unit 340, 350 volts 400 Power supply system 410 Alternator 420 Starter 430 Second secondary battery 440 Load 450 Switch 460 Control unit

Claims (6)

A plurality of battery cells;
A cell holder for holding the plurality of battery cells in a lower case;
An inter-cell bus bar that is welded to the electrode terminals of the plurality of battery cells on the upper surface of the cell holder and electrically connects the electrode terminals of different battery cells among the plurality of battery cells;
A secondary battery controller board fixed to the cell holder by being fastened together with a fastening point of the inter-cell bus bar from the upper surface side,
The assembled battery, wherein a welded portion of the inter-cell bus bar is exposed from the secondary battery controller board in a top view. A plurality of battery cells;
A cell holder for holding the plurality of battery cells in a lower case;
An inter-cell bus bar that is welded to the electrode terminals of the plurality of battery cells on the upper surface of the cell holder and electrically connects the electrode terminals of different battery cells among the plurality of battery cells;
A secondary battery controller board fixed to the cell holder by being fastened together with a fastening point of the inter-cell bus bar from the upper surface side,
An assembled battery in which more than half of the area of the inter-cell bus bar in a top view is exposed from the secondary battery controller board. A plurality of battery cells;
A cell holder for holding the plurality of battery cells in a lower case;
A plurality of inter-cell bus bars that are welded to electrode terminals of the plurality of battery cells on the upper surface of the cell holder, and electrically connect the electrode terminals of different battery cells among the plurality of battery cells;
A secondary battery controller board fixed to the cell holder by being fastened together with a fastening point of the inter-cell bus bar from the upper surface side,
The assembled battery in which the ratio of the area of the exposed portion from the secondary battery controller board to the area of the plurality of inter-cell bus bars in the top view of the inter-cell bus bar is substantially the same.   The inter-cell bus bar includes a plurality of the fastening points, and is fastened to the cell holder together with the secondary battery controller board by being fastened together at all of the plurality of fastening points. The assembled battery according to claim 1. The plurality of fastening points of the inter-cell bus bar are arranged at positions symmetrical with respect to a bisector of the two electrode terminals to be electrically connected in a top view,
The assembled battery according to claim 4, wherein at least one of the plurality of fastening points is joined to the secondary battery controller board as a voltage detection line.   A power supply apparatus provided with the assembled battery as described in any one of Claims 1 thru | or 5.