JP2018125192A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack in which adhesive is easy to wet and spread, and the coating accuracy is improved in a holder for holding the battery cell.SOLUTION: A battery pack 100 according to the present invention includes a plurality of battery cells 150 having a cap surface 151 and a holder 120 for holding the stacked battery cells 150 so as to cover the cap surface 151, and the holder 120 includes a contact surface portion 122b that is in contact with the cap surface 151, and a first rib 127 disposed between adjacent battery cells 150 and having one end connected to the contact surface portion 122b and extending in a direction orthogonal to the contact surface portion 122b, and a first groove portion 122c provided along the connecting portion 127a between the contact surface portion 122b and the first rib 127.SELECTED DRAWING: Figure 8

Description

  The present invention relates to an assembled battery.

  Conventionally, a battery pack in which a plurality of battery cells are housed in a member such as a housing is known. For example, Patent Document 1 discloses an assembled battery configured by arranging a plurality of lithium ion cells on a frame member.

Special table 2014-504440 gazette

  In the battery module described in Patent Document 1, each battery cell is fixed by a belt and a frame cover. However, the battery module described in Patent Document 1 does not consider the point of fixing each battery cell and the frame member with an adhesive, and therefore, the ease of wetting and spreading of the adhesive on the frame member and the application accuracy are not considered. Did not consider.

  An object of the present invention made in view of such a viewpoint is to provide an assembled battery in which an adhesive is easily spread out and a coating accuracy is improved in a holding body for holding a battery cell.

In order to solve the above-described problem, an assembled battery according to the first aspect of the present invention includes:
A plurality of battery cells having a cap surface;
A holding body for holding the battery cells stacked so as to cover the cap surface;
With
The holder is
A contact surface portion that contacts the cap surface;
A first rib disposed between adjacent battery cells, one end of which is connected to the contact surface portion and extends in a direction perpendicular to the contact surface portion;
A first groove portion provided along a connection portion between the contact surface portion and the first rib;
Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, in the holding body for hold | maintaining a battery cell, the assembled battery which an adhesive agent is easy to wet and spread and an application precision improves can be provided.

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 sectional drawing along the AA line of the cell holder of FIG.7 (b). It is the figure which showed the 1st modification of the cell holder. It is the figure which showed the 2nd modification of the cell holder. It is the figure which showed the 3rd modification of the cell holder. 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 along the BB cross section of FIG. 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 along CC cross section of FIG. It is a figure which shows typically the modification of the adhesion position of the battery cell in the assembled battery of FIG. 1, a lower case, and a cell holder along the BB cross section of FIG. It is a figure which shows typically the modification of the adhesion position of the battery cell in the assembled battery of FIG. 1, a lower case, and a cell holder along CC cross section of FIG. 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 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 19 for details of each component. 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 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 includes 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 a secondary battery such as a lithium ion battery or 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 that connects or disconnects 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 electric 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 with the output voltage adjusted by 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 a sectional view taken along line AA of the cell holder 120 of FIG. FIG. 8A shows the entire cross section of the cell holder 120. FIG. 8B is an enlarged cross-sectional view in which a part of the cross section of the cell holder 120 is enlarged. FIG. 9 is a view showing a first modification of the cell holder 120. FIG. 9A is a perspective view of the cell holder 120. FIG. 9B is an enlarged view in which a part of the surface of the cell holder 120 is enlarged. FIG. 9C is an enlarged cross-sectional view including a part of the surface of the cell holder 120 shown in FIG. FIG. 10 is a view showing a second modification of the cell holder 120. FIG. 11 is a view showing a third modification of the cell holder 120. FIG. 12 is an external perspective view showing a state in which the cell holder 120 is attached to the lower case 110. FIG. 13 is an enlarged external perspective view of the inter-cell bus bar 160 attached to the cell holder 120. 14A to 14D are diagrams schematically showing the bonding positions of the battery cell 150, the lower case 110, and the cell holder 120 in the assembled battery 100. FIG. FIG. 15 is a diagram schematically illustrating a state before and after the engagement claw 128 of the cell holder 120 and the engagement hole 115 of the lower case 110 are engaged. FIG. 16 is an external perspective view of the auxiliary machine pedestal 200, and FIG. 17 is a side view of the auxiliary machine pedestal 200 viewed from one side. FIG. 17A is a side view of only the auxiliary machine base 200, and FIG. 17B is a side view of the auxiliary machine base 200 with components such as the relay 220 mounted thereon. FIG. 18 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. 19 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. 20 is a diagram illustrating a state of assembly of the entire assembled battery, and FIG. 21 is a diagram for illustrating a state of assembly of the battery module group and the auxiliary module group.

  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 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 of 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 lower case 110 corresponds to the housing of the present invention.

  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. Further, the battery cell 150 has a can bottom surface 155 that faces the cap surface 151, and four side surfaces 156 a, 156 b, 156 c, and 156 d that are perpendicular to the cap surface 151 and the can bottom surface 155. In the battery cell 150, the side surfaces 156a and 156c face each other, and the side surfaces 156b and 156d face each other. The four side surfaces 156a, 156b, 156c, and 156d are disposed at positions corresponding to the four side surfaces 112a, 112b, 112c, and 112d of the lower case 110, respectively, in a state where the battery cell 150 is accommodated in the lower case 110. Hereinafter, when the four side surfaces 156a, 156b, 156c, and 156d are not distinguished, they are collectively referred to as a side surface 156. The cap surface 151, the can bottom surface 155, and the side surface 156 have 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. The positive terminal 152 and the negative terminal 153 include, for example, a flat terminal, a cylindrical terminal, or another appropriate type of terminal. 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 or thermal runaway or 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 (holding body) has a substantially rectangular shape when viewed from above, an outer peripheral frame 121 having a predetermined height, and an inner surface of the outer peripheral frame 121 with the cell holder 120 engaged with the lower case 110. And a holding lid 122 held from the side. 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. Thus, the cell holder 120 holds the stacked battery cells 150 so as to cover the cap surface 151 of the battery cells 150.

  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. 12, 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 124a 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. 12, in a state where the cell holder 120 and the lower case 110 are engaged, the gas discharged from the safety valve 154 is discharged from the opening 124b 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 124a and 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. 13, 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 part 126 in a state where the voltage sensor mounting terminal 163 is disposed on the screw hole forming part 126, and the screw hole 126a and screw are screwed by the LBC 140. The holes 163a are screwed 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. 20, 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 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 140 is placed on the upper surface side of the cell holder 120 and is screwed 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 (first rib) 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 rib 127 is disposed between adjacent battery cells 150 among the plurality of stacked battery cells 150.

  In FIG. 7B, the rib 127 extends over a region from the side surface 121a to the side surface 121c, but is not limited to this. The rib 127 may extend over an arbitrary region as long as the displacement of the battery cell 150 can be prevented. For example, the rib 127 may be provided only near the center on the lower surface side of the holding lid 122.

  As shown in FIG. 7B, the cell holder 120 has a contact surface portion 122 b that contacts the cap surface 151 of the battery cell 150 on the lower surface of the holding lid 122. More specifically, the cap surface 151 abuts on a frame portion on the lower surface side of the holding lid 122 excluding a portion to which the opening 124a and the opening 124b and the rib 127 are connected in the abutting surface portion 122b. In the engaged state between the cell holder 120 and the lower case 110, the positive electrode terminal 152, the negative electrode terminal 153, and the safety valve 154 of the battery cell 150 are exposed from the corresponding openings 124a and 124b, respectively, while the cap surface 151 contacts. It abuts on the surface portion 122b. Thereby, the position of the battery cell 150 in the direction orthogonal to the contact surface portion 122b is determined.

  One end of the rib 127 is connected to the contact surface portion 122b, and is configured to extend in a direction orthogonal to the contact surface portion 122b. More specifically, one end on the upper surface side of the rib 127 is connected to the contact surface portion 122b, and extends linearly from the contact surface portion 122b toward the lower surface side.

  As shown in FIG. 8, the cell holder 120 has a first groove portion 122 c provided on the surface of the contact surface portion 122 b along the connection portion 127 a between the contact surface portion 122 b and the rib 127. More specifically, the 1st groove part 122c is formed over the surface of the contact surface part 122b adjacent to the connection part 127a. That is, the first groove part 122c is formed on both sides of the connection part 127a. In other words, the connection portion 127a is sandwiched between the two first groove portions 122c.

  An adhesive described later flows into the first groove portion 122 c and is disposed along the rib 127. As described above, the formation of the first groove portion 122 c facilitates the flow of the adhesive along the rib 127. Thereby, in the cell holder 120, an adhesive agent spreads easily and application | coating precision improves. That is, the reliability of the assembled battery 100 is improved.

  In FIG. 8, the first groove 122 c is extended on the surface of the contact surface 122 b over the region extending from the side surface 121 a to the side surface 121 c according to the rib 127, but is not limited thereto. The first groove 122c may be extended over an arbitrary region. For example, the first groove portion 122c may be provided only in the vicinity of the center in the contact surface portion 122b. Thereby, the area | region which apply | coats an adhesive agent can be reduced and the application quantity of the adhesive agent to be used can be suppressed. That is, the assembled battery 100 can reduce cost.

  Moreover, the 1st groove part 122c is not limited to the structure extended on the surface of the contact surface part 122b. For example, the first groove portion 122 c may be provided on the side wall of the rib 127 along the connection portion 127 a between the contact surface portion 122 b and the rib 127.

  As shown in FIG. 8B, the first groove 122c has a first side wall 122d formed on the side facing the rib 127. For example, the first side wall 122d may be inclined so as to be separated from the rib 127 as it goes in the direction in which the rib 127 extends, that is, from the upper surface side toward the lower surface side. Thus, the first side wall 122d is formed in a tapered shape.

  The first sidewall 122d formed in a tapered shape makes it easier for the adhesive to flow into the first groove 122c. That is, the ease of spreading and application accuracy of the adhesive are further improved.

  In FIG. 8, the first side wall 122d is formed as a linear inclined surface over the whole, but is not limited thereto. For example, only a part of the first side wall 122d may be formed as a slope. Thereby, the area | region which apply | coats an adhesive agent can be reduced and the application quantity of the adhesive agent to be used can be suppressed. That is, the assembled battery 100 can reduce cost. The first side wall 122d is not limited to a linear slope, and may be any shape as long as it is tapered. On the other hand, the first side wall 122d may not be configured as an inclined surface, and may be formed in a vertical plane shape as a part of a normal groove.

  The first side wall 122d may be formed as a rough surface in the molding process of the cell holder 120. That is, the first sidewall 122d may have irregularities on the surface. As a result, the adhesive area of the adhesive in the first groove 122c increases, and the adhesive strength between the cell holder 120 and the battery cell 150 increases due to the anchor effect.

  In addition, as shown in FIG. 9, the cell holder 120 may have a second groove 122e that is connected to the first groove 122c and extends in a direction orthogonal to the first groove 122c in plan view. In FIG. 9, five second groove portions 122e are provided in a part of the contact surface portion 122b sandwiched between two adjacent ribs 127. More specifically, three second groove portions 122e are provided along one rib 127, and two second groove portions 122e are provided along the other rib 127.

  The adhesive is guided to the first groove 122c through the second groove 122e. Thus, the adhesive easily spreads to the first groove 122c by the second groove 122e. Further, it is possible to accurately guide the adhesive to the first groove 122c by the second groove 122e.

  The 2nd groove part 122e is not limited to said structure, The one or more should just be provided with respect to one 1st groove part 122c. Further, the second groove portion 122e may be provided over the entire contact surface portion 122b. Further, the second groove 122e may be provided in a symmetrical arrangement with respect to the two adjacent ribs 127.

  Moreover, the cell holder 120 has the 1st embossed part 122f which is provided in the bottom face of the 1st groove part 122c as shown in FIG. Furthermore, the cell holder 120 has a second embossed portion 122h that is provided on the second side wall 122g of the first groove portion 122c that constitutes a part of the side wall 127b of the rib 127, and has a concavo-convex pattern. In FIG. 10, as an example, the first embossed portion 122f and the second embossed portion 122h are formed only in a part of the first groove portion 122c. However, it is not limited to this, The 1st embossed part 122f and the 2nd embossed part 122h may be formed over a wider range, and may be formed over the 1st groove part 122c whole.

  Due to the first embossed portion 122f and the second embossed portion 122h as described above, the adhesive area of the adhesive in the first groove portion 122c is increased, and the adhesive strength between the cell holder 120 and the battery cell 150 is further increased due to the anchor effect.

  Furthermore, the cell holder 120 has a rib 122i (second rib) that is connected to the side wall 127b of the rib 127 and protrudes in a direction orthogonal to the side wall 127b, as shown by enlarging the broken line encircled portion in FIG. In FIG. 11, three ribs 122i protrude from the side wall 127b. Each rib is parallel to each other, and extends from one end on the upper surface side of the side wall 127b to one end on the lower surface side along the protruding direction of the rib 127.

  When the first side wall 122d is a smooth inclined surface, the adhesive flows on the first side wall 122d and is guided to the first groove part 122c provided along the rib 127. A part of the adhesive guided to the first groove portion 122c comes into contact with the rib 122i. At this time, even if the surface of the first side wall 122d is not uneven, due to the presence of the rib 122i, the adhesive area of the adhesive in the first groove 122c increases, and the anchor effect between the cell holder 120 and the battery cell 150 is increased. Adhesive strength can be maintained.

  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. 15B, the engagement 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. Further, the engaging claw 128 and the engaging hole 115 do not necessarily have to be provided on the cell holder 120 side and the lower case 110 side, respectively. You may provide an engaging claw in.

  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 contact surface portion 122b of the cell holder 120, and then the battery cell 150 is fixed. Thereafter, an adhesive is applied to the bottom surface 111 of the lower case 110 to engage the cell holder 120 and the lower case 110. 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. The adhesive preferably has elasticity when cured. 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. Therefore, the adhesive is not necessarily used for the contact surface portion 122b of the cell holder 120 and the lower case 110. It may not be applied to the entire bottom surface 111 and may be applied to a part of these. For example, the adhesive may be applied only in the vicinity of the center along the rib 127 on the contact surface portion 122 b of the cell holder 120. In particular, since the cap surface 151 of the battery cell 150 includes the positive electrode terminal 152, the negative electrode terminal 153, and the safety valve 154, the cap surface 151 is provided on, for example, the contact surface portion 122b of the cell holder 120 so that no adhesive is applied thereto. The adhesive may be applied linearly only near the center along the first groove 122c. Similarly, the adhesive may be applied linearly only to the central portion of the rectangular area surrounded by the guide 116 on the bottom surface 111 of the lower case 110.

  More specifically, with the cell holder 120 turned upside down, the cap surface 151 of the battery cell 150 is directed 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. At this time, the adhesive applied linearly only near the center along the first groove 122 c of the cell holder 120 contacts the cap surface 151 of the battery cell 150. Before the adhesive is cured, the positive electrode terminal 152 and the negative electrode terminal 153 are positioned with respect to the cell holder 120 by aligning the edge of the battery cell 150 with the lower surface side of the holding lid 122, that is, the contact surface portion 122 b and the rib 127. Then, the battery cell 150 and the cell holder 120 are adhere | attached because an adhesive agent hardens | cures. As described above, the adhesive is applied along the first groove portion 122 c provided in the cell holder 120. Therefore, the adhesive is applied to the peripheral edges of the rib 127 and the contact surface portion 122b with high accuracy without being restricted by the nozzle shape (thickness and length) of the applicator. That is, since the adhesive easily flows along the rib 127 due to the formation of the first groove portion 122c, even if the nozzle is thick and the distance from the rib 127 is increased, the adhesive remains in the rib 127 and the contact surface portion 122b. It is applied to the periphery. In other words, it is not necessary to elongate the nozzle in order to reduce the distance between the nozzle and the rib 127, and the assembled battery 100 can prevent an increase in the size of the device accompanying high-pressure discharge.

  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, the adhesive applied linearly only to the central portion of the rectangular region surrounded by the guide 116 of the lower case 110 contacts the bottom surface 155 of the battery cell 150. Before the adhesive is cured, the battery cell 150 is accommodated along each region of the bottom surface 111 delimited by the guide 116. Further, as shown in FIGS. 15A and 15B, 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, the inter-cell bus bar 160, the total plus terminal bus bar 164, and the total minus terminal bus bar 165 are attached to each terminal of the battery cell 150 exposed from the opening 124a of the holding lid 122 by bead welding, and the LBC 140 is attached to the holding lid 122. Thus, the assembly of the battery module group is completed. As described above, the LBC 140 is attached to the holding lid 122 by, for example, screwing.

  FIG. 14A shows a 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 in (namely, cap surface 151). FIG. 14A is a cross-sectional view taken along the line BB in FIG. 12, and particularly shows only the central battery cell 150 and its periphery among the five stacked battery cells 150. Moreover, in FIG. 14A, the area | region where an adhesive agent is arrange | positioned is shown with the shading. In this case, as shown in FIG. 14A, the battery cell 150 is adhered to the cell holder 120 at an adhesive portion 170 made of an adhesive that fills a peripheral region at the intersection of the holding lid 122 and the rib 127, and the bottom surface 111. Is bonded to the lower case 110 at an adhesive portion 180 made of an adhesive that fills a region between the bottom surface 155 and the can bottom 155.

  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.

  Here, the embodiment of the present invention will be described in more detail with reference to FIG. 14A. The adhesive applied linearly only in the vicinity of the center along the first groove 122c of the cell holder 120 protrudes from the cap surface 151 by the pressure when contacting the cap surface 151 of the battery cell 150, and the side surface of the battery cell 150 It extends to a part of 156b and 156d. That is, not only is a part of the region between the cap surface 151 and the lower surface side of the holding lid 122 filled with the adhesive, but the adhesive is also applied to a part of the region between the side surfaces 156b and 156d and the rib 127. Is filled. Thereby, the adhesion part 170 is comprised, and not only the battery cell 150 is adhesively fixed to the cell holder 120 in the vertical direction, but also adhesively fixed in the horizontal direction. The adhesive that covers a part of the region between the side surfaces 156b and 156d and the rib 127 further strengthens the adhesion and fixing of the battery cell 150 in the horizontal direction, and the direction of the battery cell 150 when the vehicle travels. Can absorb the vibration to the hardened adhesive.

  In one embodiment of the present invention, the thickness of the adhesive portion 170 provided on the cap surface 151 side is smaller than the thickness of the adhesive portion 180 provided on the can bottom surface 155 side. Thereby, when the edge of the battery cell 150 is aligned with the lower surface side of the holding lid 122 of the cell holder 120 and the rib 127, the positive electrode terminal 152 and the negative electrode terminal 153 can be more accurately positioned with respect to the cell holder 120.

  The adhesive applied linearly only to the central portion of the rectangular region surrounded by the guide 116 of the lower case 110 is caused by the pressure when contacting the can bottom surface 155 of the battery cell 150 between the can bottom surface 155 and the bottom surface 111. Fill the area between. Thereby, the adhesion part 180 is comprised and the battery cell 150 is adhesively fixed to the lower case 110.

  In one embodiment of the present invention, the thickness of the adhesive portion 180 provided on the can bottom surface 155 side is thicker than the thickness of the adhesive portion 170 provided on the cap surface 151 side. Thereby, the adhesion and fixing of each battery cell 150 to the lower case 110 is further strengthened. In addition, when the lower case 110 is bonded to the battery cell 150, each region can be filled with an adhesive according to the variation in the distance between the bottom surface 155 of each battery cell 150 and the bottom surface 111 of the lower case 110. That is, a degree of freedom can be given to the bonding and fixing position between each battery cell 150 and the lower case 110.

  Furthermore, when the lower case 110 is engaged with the cell holder 120 by making the thickness of the lower surface side adhesive portion 180 larger than the thickness of the upper surface side adhesive portion 170, the battery cell 150 is attached by the pressing when the lower case 110 is engaged with the cell holder 120. Compress the adhesive that makes up. By bonding and fixing the battery cell 150 to the lower case 110, the adhesive constituting the bonding portion 180 supports the battery cell 150 from the lower surface side. Since the cured adhesive has elasticity, the adhesive absorbs vibration generated when the vehicle including the assembled battery 100 travels, and vibration is not easily transmitted to the battery cell 150. Therefore, it is possible to suppress the relative displacement of the electrode terminals due to vibration during vehicle travel, avoid excessive stress on the inter-cell bus bar 160 that connects the battery cells 150, and prevent breakage thereof.

  FIG. 14B is a diagram schematically showing each bonding position similarly to FIG. 14A, but is a cross-sectional view taken along the line CC in FIG. 12, unlike FIG. 14A. Similarly to FIG. 14A, the area to which the adhesive is applied is indicated by shading. In one embodiment of the present invention, the application length of the adhesive arranged linearly along two opposing long sides in the cap surface 151 is the adhesive arranged linearly at the center of the bottom surface 155 of the can. Long compared to the coating length of the agent. Therefore, the length of the adhesive portion 170 provided on the cap surface 151 side is longer than the length of the adhesive portion 180 provided on the can bottom surface 155 side. This is because, as described above, since the thickness of the bonding portion 170 is smaller than the thickness of the bonding portion 180, the adhesive strength that is reduced by this is compensated.

  Next, another embodiment of the present invention will be described based on FIGS. 14C and 14D. For convenience of explanation, members having the same functions as the constituent elements described in the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. Only differences from the above-described embodiment will be described.

  FIG. 14C is a cross-sectional view taken along the line BB of the assembled battery 100 according to another embodiment of the present invention corresponding to FIG. In another embodiment of the present invention, the adhesive applied linearly only in the vicinity of the center along the first groove 122c of the cell holder 120 is greatly spread by the pressure when contacting the cap surface 151 of the battery cell 150, It extends to the cap surface 151 and part of the side surfaces 156b and 156d of the battery cell 150. That is, the entire area surrounded by the lower surface side of the battery cell 150 and the holding lid 122 and the rib 127 is filled with the adhesive. Thereby, the battery cell 150 is more firmly bonded and fixed to the cell holder 120 in the vertical direction and the horizontal direction.

  The adhesive applied linearly only to the central portion of the rectangular region surrounded by the guide 116 of the lower case 110 is between the can bottom surface 155 and the bottom surface 111 due to the pressure when contacting the can bottom surface 155 of the battery cell 150. The entire area is filled and extends to the entire area surrounded by the side surfaces 156b and 156d and the guide 116. Thereby, the battery cell 150 is more firmly bonded and fixed to the lower case 110 in the vertical direction and the horizontal direction.

  FIG. 14D is a cross-sectional view taken along the line CC of the assembled battery 100 according to another embodiment of the present invention corresponding to FIG. In another embodiment of the present invention, the adhesive applied linearly only in the vicinity of the center along the first groove 122c of the cell holder 120 is greatly spread by the pressure when contacting the cap surface 151 of the battery cell 150, It extends to the cap surface 151 and part of the side surfaces 156a and 156c of the battery cell 150. That is, the entire area surrounded by the lower surface side of the battery cell 150 and the holding lid 122, the side surfaces 121a and 121c, and the rib 127 is filled with the adhesive. Similarly, the adhesive applied linearly only to the central portion of the rectangular region surrounded by the guide 116 of the lower case 110 is applied to the can of the battery cell 150 by the pressure when contacting the can bottom 155 of the battery cell 150. The entire region between the bottom surface 155 and the bottom surface 111 is filled, and extends to the entire region surrounded by the side surfaces 156a and 156c of the battery cell 150, the side surfaces 112a and 112c of the lower case 110, and the guide 116. Thereby, the battery cell 150 is more firmly bonded and fixed to the engaged cell holder 120 and the lower case 110 in the vertical direction and the horizontal direction.

  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. 16, 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. 16, the unevenness of the mounting surface 201 includes an area 201c where the relay 220 is mounted on the mounting surface 201, an area 201a where the current sensor 230 is mounted, and a 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. 16 and 18, 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. 18 and 19, 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. Terminal 220 b of relay 220 is further electrically connected to SSG terminal 250 via copper bus bars 282 and 283. The other 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. 20, 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 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.

100 assembled battery 110 lower case 110a space 111 bottom surface 112, 112a, 112b, 112c, 112d, 121a, 121b, 121c, 121d, 156a, 156b, 156c, 156d, 200a, 200b, 200c, 200d side surfaces 113, 124a, 124b, 221, 310 a, 310 b, 310 c Opening 114 Mounting mechanism 115, 129 a, 129 b Engaging hole 116 Guide 120 Cell holder (holding body)
121 outer peripheral frame 121e engagement insertion part 122 holding lid 122a frame part 122b contact surface part 122c first groove part 122d first side wall 122e second groove part 122f first embossed part 122g second side wall 122h second embossed part 122i rib (second rib) )
123, 126, 204 Screw hole forming portion 123a, 123b, 126a, 163a, 166a, 204a, 285a, 286a Screw hole 123c Bus bar support portion 125 Bead 127 Rib (first rib)
127a connection part 127b side wall 128, 205, 320 engaging claw 130 first secondary battery 140 LBC (battery controller)
150 battery cell 151 cap surface 152 positive electrode terminal 153 negative electrode terminal 154 safety valve 155 can bottom 160 inter-cell bus bar 161 convex 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 Part 170, 180 Adhesion part 200 Auxiliary machine base 201 Placement surface 201a, 201b, 201c, 201d Region 202 Rib 203 Stud 206 Support part 210 MOSFET
210a, 210b, 220a, 220b, 230a, 230b, 240a, 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 (7)

A plurality of battery cells having a cap surface;
A holding body for holding the battery cells stacked so as to cover the cap surface;
With
The holder is
A contact surface portion that contacts the cap surface;
A first rib disposed between adjacent battery cells, one end of which is connected to the contact surface portion and extends in a direction perpendicular to the contact surface portion;
A first groove portion provided along a connection portion between the contact surface portion and the first rib;
Comprising
Assembled battery. In a cross-sectional view along the direction orthogonal to the contact surface portion, the first side wall of the first groove portion facing the first rib is separated from the first rib toward the direction in which the first rib extends. To tilt,
The assembled battery according to claim 1. The first side wall has irregularities on the surface,
The assembled battery according to claim 2. The first groove portion includes a first embossed portion provided on a bottom surface.
The assembled battery according to any one of claims 1 to 3. The first groove part includes a second embossed part provided on a second side wall of the first groove part constituting a part of the side wall of the first rib.
The assembled battery according to any one of claims 1 to 4. A second rib connected to the side wall of the first rib and projecting in a direction perpendicular to the side wall;
The assembled battery according to any one of claims 1 to 5. A second groove part connected to the first groove part and extending in a direction orthogonal to the first groove part in plan view;
The assembled battery according to any one of claims 1 to 6.