JP6500819B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device.

  Electric vehicles such as hybrid vehicles and electric vehicles are equipped with a high capacity storage device. For example, the electric vehicle described in Japanese Patent Application Laid-Open No. 2007-8443 is mounted on a floor panel on the rear side of the rear seat.

JP 2007-8443 A

  The power storage device described in Japanese Patent Laid-Open No. 2007-8443 is mounted in a vehicle compartment. For this reason, there is a possibility that load due to luggage or a passenger may be applied to the power storage device from above the power storage device.

  When a large load is applied to the upper surface of the storage device, the upper surface of the storage case is deformed, and the upper surface of the deformed case comes in contact with the main system relay housed in the case, and the load is transferred to the main system relay. It may be added.

  The present invention has been made in view of the above problems, and an object thereof is that a load is applied to a main system relay in an electric storage device even if a large load is applied from the upper surface of the electric storage device. Is to provide a power storage device in which

  The power storage device according to the present invention is, in one aspect, a power storage device mounted on an electric vehicle including an electric motor. The power storage device includes a case including an upper wall portion, a battery stack including a plurality of battery cells housed in the case, and a system main relay controlling an electrical connection between the battery stack and the motor. And a bolt for fixing the system main relay in the case above the battery stack. The bolt is disposed to extend in the vertical direction, and the distance between the upper end of the bolt and the upper wall of the case is shorter than the distance between the system main relay and the upper wall.

  According to the above power storage device, when a load or an impact force is applied to the power storage device from above the power storage device, the upper surface of the case is bent. Even if the upper surface of the case is bent, the upper end of the bolt can be in contact with the upper surface of the case before the system main relay, and the upper surface of the case can be prevented from contacting the system main relay.

  According to the power storage device of the present invention, even if a large load is applied from the upper surface of the power storage device, it is possible to suppress the load from being applied to the system main in the power storage device.

FIG. 1 is a schematic view schematically showing an electrically powered vehicle 100 equipped with a power storage device 1 according to an embodiment. It is a circuit block diagram for demonstrating the structure of the electric system of a vehicle. It is sectional drawing in the III-III line shown in FIG. 5 is an exploded perspective view showing a case 30. FIG. It is sectional drawing in the VV line shown in FIG. FIG. 7 is a plan view of power storage device 1 in plan view with lid 40 removed. It is an enlarged view in VII shown in FIG. It is sectional drawing which shows the front-end | tip part of the axial part 60, and its surrounding structure. FIG. 7 is a cross-sectional view showing a power storage device 1A according to a comparative example.

  FIG. 1 is a schematic view schematically showing electrically powered vehicle 100 in which power storage device 1 according to the embodiment is mounted. As shown in FIG. 1, electrically powered vehicle 100 includes a power storage device 1, a PCU (power control unit) 2, motor generators 3 and 4, and an engine 5.

  Electric powered vehicle 100 is provided behind floor panel 20 forming the bottom of electric powered vehicle 100 and partitioning the interior and exterior of the vehicle, front seat 21 and rear seat 22 provided on floor panel 20, and rear seat 22. And a luggage board 23.

  The luggage board 23 divides an in-vehicle space located rearward of the rear seat 22 into a luggage space 24 and a device accommodation space 25. The device housing space 25 is partitioned below the luggage space 24 with the luggage board 23 interposed therebetween.

  Power storage device 1 is housed in device housing space 25. Power storage device 1 is mounted on a portion of the upper surface of floor panel 20 that is located rearward of rear seat 22. In addition, in FIG. 1 etc., "F" in a figure shows the front direction of the electric vehicle 100, and "B" shows a rear direction. "L" indicates the left direction and "R" indicates the right direction. "U" indicates upward and "D" indicates downward.

  FIG. 2 is a circuit block diagram for explaining the configuration of the electric system of the vehicle. As shown in FIG. 2, electrically powered vehicle 100 includes a power storage device 1, SMRs (system main relays) 10 and 11, and a PCU 2. PCU 2 is provided between inverter 6 connected to motor generator 3, inverter 7 connected to motor generator 4, converter 9 connected to inverters 6 and 7, inverter 6, 7 and converter 9. And a smoothing capacitor 8.

  The SMRs 10 and 11 control the connection between the converter 9 and the storage device 1. When SMRs 10 and 11 are connected, power storage device 1 is electrically connected to motor generators (motors) 3 and 4 through PCU 2. When SMRs 10 and 11 are disconnected, motor generators 3 and 4 and power storage device 1 are connected. And are electrically disconnected.

  FIG. 3 is a cross-sectional view taken along line III-III shown in FIG. As shown in FIG. 3, power storage device 1 includes a case 30 including upper case 31 and lower case 32, SMRs 10 and 11 housed in case 30, battery stack 34, and a plurality of mounted devices 35.

  FIG. 4 is an exploded perspective view showing the case 30. As shown in FIG. The case 30 includes an upper case 31 and a lower case 32 provided on the lower surface of the upper case 31. The upper case 31 includes a case main body 41 opening upward and a lid (upper wall) 40 closing the opening of the case main body 41. A plurality of mounting plates 56 extending in the front-rear direction of the electric vehicle 100 are arranged at intervals on the bottom side of the case main body 41, and SMRs 10 and 11 (shown in FIG. Not shown) and a plurality of mounted devices 35 are arranged.

  FIG. 5 is a cross-sectional view taken along the line V-V shown in FIG. As shown in FIG. 5, the battery stack 34 is accommodated in the lower case 32 of the case 30. Battery stack 34 includes a plurality of battery cells 50 arranged in the left-right direction of electrically powered vehicle 100, bus bar modules 51 and 52, and an exhaust duct 53. The bus bar modules 51 and 52 and the exhaust duct 53 are provided on the top surface of the battery stack 34 and are formed to extend in the direction in which the battery cells 50 are arranged.

  The bus bar modules 51 and 52 connect the positive electrode terminal and the negative electrode terminal of each battery cell 50, and the plurality of battery cells 50 are connected in series by the bus bar modules 51 and 52. The exhaust duct 53 allows the gas discharged from each battery cell 50 to flow.

  As shown in FIG. 3, the plurality of mounted devices 35 and the SMRs 10 and 11 are accommodated in the case 30, and the SMRs 10 and 11 and the plurality of mounted devices 35 are disposed above the battery stack 34. It is done.

  FIG. 6 is a plan view of the power storage device 1 in plan view with the lid 40 removed, and the mounted devices 35 have various shapes, and the plurality of mounted devices 35 include a battery ECU and the like. Various sensors etc. are included. In FIG. 6, the battery stack 34 disposed below the plurality of mounted devices 35 is not shown.

  7 is an enlarged view of VII shown in FIG. As shown in FIG. 7, power storage device 1 fixes beam portion 55 extending in the front-rear direction of electrically powered vehicle 100, mounting plate 56 fixed to the upper surface of beam portion 55, beam portion 55 and mounting plate 56. And a bolt 57 and a nut 58.

  Beam portion 55 extends in the front-rear direction of electrically powered vehicle 100, and both end portions of beam portion 55 are fixed to the inner wall surface of case 30. The mounting plate 56 includes a fixing portion 63 in which a recess 62 is formed on the top surface, and a mounting portion 64 and a mounting portion 65 provided on both sides of the fixing portion 63. The SMR 10 is fixed to the upper surface of the mounting portion 64, and the SMR 11 is fixed to the upper surface of the mounting plate 56.

  The bolt 57 includes a head portion 61 and a shaft portion 60 having a thread formed on the circumferential surface. In the beam portion 55 and the fixing portion 63, a through hole into which the shaft portion 60 of the bolt 57 is inserted is formed. The through hole formed in the fixing portion 63 communicates with the recess 62.

  The bolt 57 is inserted from the lower surface side of the beam 55 and the mounting plate 56, and the head 61 is disposed on the lower surface of the beam 55. That is, the shaft portion 60 is disposed to extend upward from below.

  The nut 58 is disposed in the recess 62, and the mounting plate 56 is fixed to the upper surface of the beam 55 by screwing the nut 58 with the shaft 60. Thus, the SMRs 10 and 11 are fixed in the case 30.

  FIG. 8 is a cross-sectional view showing the configuration of the upper end portion of the shaft portion 60 and the periphery thereof. In FIG. 8, “L1” indicates the vertical distance between the upper end of the shaft 60 and the lid 40. “L2” indicates the vertical distance between the top surface of the SMR 10 and the lid 40. “L3” indicates the distance between the top surface of the SMR 11 and the lid 40 in the vertical direction. And bolt 57, SMR10, and SMR11 are arranged so that distance L1 may become shorter than any of distance L2 and distance L3. The distance in the vertical direction between the top surface of each mounting device 35 and the lid 40 is longer than the distance in the vertical direction between the top surface of the SMRs 10 and 11 and the lid 40, and each mounting device 35 has the SMRs 10 and 11. More distant from the lid 40.

  In power storage device 1 and electrically powered vehicle 100 configured as described above, a large load may be applied to the top surface of power storage device 1. For example, in FIG. 1, a case may be considered in which a heavy load or the like is dropped onto the storage device 1 by mistake while the occupant opens the luggage board 23.

  In such a case, as shown by the broken line in FIG. 8, the lid 40 of the case 30 is bent. Even if the lid 40 is bent, the upper end of the bolt 57 first contacts the lid 40, and the SMRs 10 and 11 are prevented from contacting the lid 40.

  Furthermore, as shown in FIG. 3, the upper surface of each mounting device 35 is farther from the lid 40 than the upper surfaces of the SMRs 10 and 11. For this reason, even if a load is applied to the power storage device 1 from above the power storage device 1, contact of the mounted device 35 with the lid 40 is suppressed.

  Thus, according to power storage device 1 according to the present embodiment, even if a load or an impact force is applied from above power storage device 1, a large load or an impact force is applied to SMRs 10 and 11 and mounting device 35. Can be suppressed.

  Table 1 below shows experimental results when the drop test is performed on the power storage device 1A according to the comparative example shown in FIG. 9 and the power storage device 1 according to the example shown in FIG. In the drop test, when an object having a mass of 7.2 (Kg) collides with the lid 40 of the electric storage device 1 or 1A from above the electric storage device 1 or 1A, deflection generated on each lid 40 of the electric storage device 1 or 1A The amount was measured. In FIG. 9, power storage device 1A includes a bolt 57A, and SMRs 10 and 11 are fixed in case 30 by this bolt 57A. The bolt 57A includes a shaft 60A and a head 61A. The distance L4 in the vertical direction between the upper end portion of the shaft portion 60A and the lid 40 is longer than the distance L1 and the distances L2 and L3 shown in FIG.

  As shown in Table 1 above, it can be seen that the lid 40 of the power storage device 1 shown in FIG. 7 has a smaller amount of deflection than the lid 40 of the power storage device 1A shown in FIG. Thus, according to power storage device 1 shown in FIG. 9, the amount of deflection of lid 40 can be reduced, and SMRs 10 and 11 housed in case 30 and a plurality of mounted devices 35 and lid 40 contact with each other. It turns out that it can control.

  In the above embodiment, although the power storage device 1 mounted on a hybrid vehicle has been described, the invention can be applied to an electric vehicle and a hydrogen fuel cell vehicle, and can be applied to various electric vehicles. It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

  1 storage device, 3, 4 motor generator, 5 engine, 6, 7 inverter, 9 converter, 20 floor panel, 21 front seat, 22 rear seat, 23 luggage board, 24 luggage space, 25 device housing space, 30 cases, 31 upper stage Case, 32 lower case, 34 battery stack, 35 mounted device, 40 lid, 41 case main body, 50 battery cell, 51, 52 bus bar module, 53 exhaust duct, 55 beam portion, 56 mounting plate, 57 bolt, 58 nut, 60 Shaft part, 61 head part, 62 recessed part, 63 fixed part, 64, 65 placement part, ECU battery, L1, L2, L3 distance.

Claims (1)

A power storage device mounted on an electric vehicle including a motor,
A case including the upper wall,
A battery stack housed in the case and including a plurality of battery cells;
A system main relay that controls an electrical connection between the battery stack and the motor;
Bolts securing the system main relay in the case above the battery stack;
Equipped with
The bolts are arranged to extend in the vertical direction,
A storage device, wherein a distance between an upper end of the bolt and an upper wall of the case is shorter than a distance between the system main relay and the upper wall.

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