JP6070995B2 - Power storage device for vehicle - Google Patents

Description

  According to the present invention, a power storage device mounted on the rear part of a vehicle body holds a storage battery group, a high voltage member connected to the storage battery group via a cable, and sandwiching the storage battery group and the high voltage member from the front and rear. The present invention also relates to a vehicle power storage device that includes a front holding member and a rear holding member that are fixed to a vehicle body, and an auxiliary machine that is attached to the rear surface of the rear holding member via a stay.

  In a state in which two front and rear frames extending in the longitudinal direction of the vehicle body and two cross members extending in the vehicle width direction are coupled in a frame shape, and a battery case storing a plurality of batteries is biased to one side in the vehicle width direction. A power storage device for a vehicle in which a cooling fan for supporting and cooling a battery in a space formed on the other side surface in the vehicle width direction of the battery case is arranged is known from Patent Document 1 below.

JP 2009-119935 A

  By the way, when such a vehicle power storage device is mounted in the trunk room at the rear of the vehicle body, it may be necessary to dispose a cooling fan on the rear surface of the battery case because of layout requirements. In such a case, when the vehicle undergoes a rear collision, the cooling fan disposed on the rear surface of the battery case is pushed forward by the collision load, and a highly rigid fan rotor that is a component of the cooling fan is pushed into the battery case. there is a possibility. Since many high voltage members such as battery cells and inverters are housed inside the battery case and connected to each other by cables, when the high voltage device is pushed by the fan rotor that has advanced due to the collision load, The cable to which the high voltage is applied is pulled and damaged, and there is a risk of grounding the metal part of the vehicle body.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to prevent damage to a cable of a power storage device when a vehicle receives a rear collision.

In order to achieve the above object, according to the first aspect of the present invention, a power storage device mounted at the rear of a vehicle body of a vehicle includes a storage battery group and a high voltage member connected to the storage battery group via a cable. A front holding member and a rear holding member that are fixed to the vehicle body by holding the storage battery group and the high-voltage member sandwiched from the front and rear, and an auxiliary machine that is attached to the rear surface of the rear holding member via a stay. A vehicle power storage device comprising: a power storage device for a vehicle, wherein the stay has a main body that surrounds the periphery of the auxiliary machine, and has a lower strength against a load in the front-rear direction than the rear holding member. Is proposed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, the stay includes a bent portion between a fixing portion to the rear holding member and a fixing portion to the auxiliary machine. A vehicular power storage device is proposed.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, a vehicular power storage device is proposed in which the bent portion has a top at a tip bent radially outward. .

  According to the invention described in claim 4, in addition to the configuration of any one of claims 1 to 3, the auxiliary machine is aligned in the front-rear direction with respect to the storage battery group or the high voltage member. A vehicle power storage device is proposed in which the rear holding member is bent forward at a portion facing the auxiliary machine.

  According to the invention described in claim 5, in addition to the configuration of claim 4, the auxiliary machine is a cooling fan, and the rear holding member located in front of the fan rotor of the cooling fan is the fan. A vehicular power storage device having a through-hole into which a rotor can be fitted is proposed.

  The battery pack 12 of the embodiment corresponds to the power storage device of the present invention, the battery module 20 of the embodiment corresponds to the storage battery group of the present invention, and the PCU 23 of the embodiment corresponds to the high voltage member of the present invention. And the cooling fan 27 of embodiment corresponds to the auxiliary machine of this invention, and the welding part 31b and flange part 31c of embodiment correspond to the fixing | fixed part of this invention.

According to the configuration of claim 1, the power storage device mounted on the rear part of the vehicle body holds the storage battery group, the high voltage member connected to the storage battery group, and the storage battery group and the high voltage member sandwiched from the front and rear. A front holding member and a rear holding member fixed to the vehicle body; and an auxiliary machine attached to the rear surface of the rear holding member via a stay. The stay has a main body part that surrounds the periphery of the auxiliary machine, and has a lower strength against the load in the front-rear direction than the rear holding member, so when the collision load of rear collision is applied to the auxiliary machine , the stay moves the auxiliary machine forward. The rear holding member is prevented from being deformed by being deformed so as to be moved to absorb the impact. Thereby, it is possible to prevent the storage battery group and the high voltage member from being displaced from each other, and to prevent disconnection of the cable connecting them.

  According to the second aspect of the present invention, since the stay includes the bent portion between the fixing portion to the rear holding member and the fixing portion to the auxiliary machine, the stay receiving the collision load is easily seated at the bent portion. It is possible to absorb the impact by bending the auxiliary machine forward.

  According to the third aspect of the present invention, since the bent portion has the apex at the tip bent radially outward, the stay receiving the collision load is deformed in the direction away from the auxiliary device, thereby interfering with the auxiliary device. It is possible to prevent the deformation of the stay from being hindered.

  According to the fourth aspect of the present invention, since the auxiliary machine is arranged at a position aligned in the front-rear direction with respect to the storage battery group or the high voltage member, it is pushed by the auxiliary machine that moves forward when the collision load of the rear collision is input. Although there is a possibility that the positional relationship between the storage battery group and the high voltage member is shifted, the rear holding member is bent forward at the portion facing the auxiliary machine, so the collision load of the rear collision is input and the auxiliary machine moves forward Sometimes, the rear holding member is pushed by the auxiliary machine and hardly deforms, and the storage battery group and the high voltage member can be prevented from being displaced from each other.

  According to the fifth aspect of the present invention, the auxiliary machine is a cooling fan, and the rear holding member located in front of the fan rotor of the cooling fan has a through hole into which the fan rotor can be fitted. When the stay is deformed by the load and the cooling fan moves forward, the fan rotor is fitted into the fitting hole of the rear holding member, so that the storage battery group and the high voltage member are more reliably displaced from each other. Can be prevented.

The perspective view of the vehicle body rear part in which a battery pack is mounted. The exploded perspective view of a battery pack. FIG. 3 is a three-direction arrow view of FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 6 is a sectional view taken along line 6-6 of FIG. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 3. The perspective view of a sensor cover. The perspective view of a stay. The perspective view of a stopper member. The perspective view of a latching means.

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

  As shown in FIG. 1, a recess 11a that is recessed downward is formed in the floor panel 11 of the trunk room at the rear of the vehicle body of the hybrid vehicle, and the battery pack 12 is mounted in the recess 11a. The battery pack 12 includes a case 13 made of a synthetic resin formed in a container shape whose upper surface is open, a metal cover 14 formed in a plate shape and closing the upper surface opening of the case 13, and extends in the vehicle width direction. The metal front part holding member 15 and the rear part holding member 16 which both ends are fixed to the upper surface of the floor panel 11 are provided. The case 13 and the cover 14 are fixed to the front holding member 15 and the rear holding member 16, and are suspended and supported in the recess 11a by the front holding member 15 and the rear holding member 16.

  As shown in FIGS. 1 and 2, the vehicle holding direction intermediate portions of the front holding member 15 and the rear holding member 16 are plate-like front walls 15a and rear walls 16a, respectively, and the front wall 15a and the rear wall 16a. Are connected together by a bottom wall 17, the left ends of the front wall 15 a and the rear wall 16 a are connected by a left side wall 18, and the right ends of the front wall 15 a and the rear wall 16 a are connected by a right side wall 19. The

  Four battery modules 20 are supported between the front holding member 15 and the rear holding member 16. The battery module 20 is formed by stacking twelve battery cells 21 made of, for example, lithium ion batteries, and connecting four corners of a pair of end plates 22 and 22 stacked at both ends in the stacking direction by four frames 29. Configured. The four battery modules 20 are juxtaposed in the vehicle width direction in a state in which the stacking direction of the battery cells 21 is aligned in the front-rear direction, and the pair of end plates 22 and 22 are respectively a front holding member 15 and a rear holding member. The 16 front walls 15a and the rear wall 16a are fastened.

  An inverter that converts the high-voltage direct current of the battery modules 20 to three-phase alternating current between the front wall 15a and the rear wall 16a of the front holding member 15 and the rear holding member 16 and on the left side of the four battery modules 20 ... In addition, a PCU (Power Control Unit) 23 including a DC-DC converter or the like for stepping down the high-voltage direct current to a low-voltage current is mounted.

  A junction board 24 that connects the battery modules 20... And the PCU 23 via a cable (not shown) is fixed to the front surface of the front holding member 15. The junction board 24 is provided with a contactor and a fuse for cutting off the electrical connection between the battery modules 20... And the PCU 23. Further, a plurality of cell voltage sensors 25, 25 for measuring the voltages of the battery cells 21 are provided on the rear surface of the rear wall 16a of the rear holding member 16 behind the battery modules 20, and the cell voltage sensors 25, A sensor cover 26 made of a metal plate that covers 25 from behind is fixed to the rear surface of the rear wall 16 a of the rear holding member 16.

  A cooling fan 27 is provided on the rear surface of the rear wall 16 a of the rear holding member 16 behind the PCU 23. When the cooling fan 27 is driven, the cooling air is sucked from the vehicle compartment through an intake duct (not shown) connected to the cooling air inlet 13b (see FIG. 1) formed in the rear wall 13a of the case 13, and the battery module 20 .. And the exhaust gas after cooling the PCU 23 is discharged outside the vehicle through the cooling fan 27 and the exhaust duct 28.

  Next, the structure of each part of the battery pack 12 will be described in detail with reference to FIGS.

  As shown in FIGS. 3, 5, and 10, the cooling fan 27 is supported by a stay 31 fixed to the left end of the rear wall 16 a of the rear holding member 16. The stay 31 is formed by press-molding a metal plate, a main body 31a partially surrounding the periphery of the cooling fan 27, a weld 31b formed by bending the front end of the main body 31a and welded to the rear wall 16a. , And a flange portion 31c formed by bending the rear end of the main body portion 31a and welded to the front surface. In the main body 31 a of the stay 31, bent portions 31 d having a triangular cross-section projecting radially outward are formed so as to partially surround the cooling fan 27.

  The cooling fan 27 includes a front casing 33 and a rear casing 34 made of synthetic resin that are coupled to each other, and a metal fan rotor 35 and a fan motor 36 that drives the fan rotor 35 are coaxially arranged therein. Placed in. Three mounting brackets 34a are projected forward from the outer periphery of the rear casing 34, and three bolts 37 penetrating through the mounting bracket 34a and the flange portion 31c of the stay 31 are welded nuts 32 ... As a result, the cooling fan 27 is fixed to the stay 31.

  A substantially circular through hole 16b is formed in the rear wall 16a of the rear holding member 16 surrounded by the welded portions 31b of the stay 31, and a rectangular duct support member 38 is fixed to the front surface of the through hole 16b. An entrance duct 39 made of synthetic resin extends from the center of the front casing 33 into the through hole 16b, and a rectangular flange 39a provided at the tip of the entrance duct 39 is fixed to the duct support member 38. As a result, the front end of the entrance duct 39 opens so as to face the rear surface of the PCU 23.

  As apparent from FIG. 5, the diameter a of the fan rotor 35 is set smaller than the diameter b of the through hole 16b of the rear holding member 16, and the diameter c of the front casing 33 and the rear casing 34 is the diameter of the through hole 16b. It is set larger than b. A longitudinal distance d from the rear end of the through hole 16 b to the rear end of the PCU 23 is set to be larger than the thickness e of the fan rotor 35 in the front-rear direction. Further, in the rear holding member 16, a portion sandwiched between the cooling fan 27 and the PCU 23 is bent forward with respect to the other portions (see FIG. 3).

  As shown in FIG. 2 to FIG. 4 and FIG. 9, the sensor cover 26 covering the cell voltage sensors 25, 25 fixed to the rear surface of the rear wall 16 a of the rear holding member 16 from the rear is formed by a large number of ridge lines 26 a. The stiffener 40 is overlapped on the front surface and further reinforced. Four projecting portions 41A, 41B, 41C, and 41D are provided on the front surface of the stiffener 40 so as to project forward. Five stud bolts 42... Planted on the rear wall 16a of the rear holding member 16 connect the center of the left three protrusions 41A, 41B, 41C and the upper and lower ends of one protrusion 41D at the right end. The sensor cover 26 is fixed with a predetermined space on the rear surface of the rear wall 16a of the rear holding member 16 by passing through and screwing into the nuts 43.

  As is apparent from FIG. 3, the protrusion 41A is located behind the left frame 29 of the leftmost battery module 20, and the protrusion 41C is the right frame 29 of the second battery module 20 from the left and 3 from the left. The protrusion 41D is located behind the right frame 29 of the right battery module 20 and is located behind the left frame 29 of the second battery module 20.

  As shown in FIGS. 2, 3, 6, 7, and 11, the cover 14 that covers the upper surface opening of the case 13 is composed of the upper surface of the front holding member 15 and the rear holding member 16 with six bolts 44. It is detachably fixed to the upper surface. An opening 14a elongated in the vehicle width direction is formed at the right end of the cover 14 projecting forward from the front holding member 15. The opening 14a is covered with a detachable lid 14b by two bolts 45 and 45. A metal stopper member 46 is fixed to the lower surface of the cover 14 facing the opening 14a. The stopper member 46 includes a pair of left and right bottom wall portions 46a and 46b, a side wall portion 46c connecting the bottom wall portions 46a and 46b, and a pair of left and right welded portions 46d formed at the left and right ends of the side wall portion 46c. , 46e, and is welded and fixed to the lower surface of the cover 14 at the welded portions 46d, 46e. One pin 46h is planted upward on the left bottom wall 46a.

  The welded portions 46d and 46e are provided on the rear end side of the stopper member 46, and a side wall portion 46c continuous in front of the welded portions 46d and 46e is used to form a space α between the lower surface of the cover 14. A pair of left and right cutouts 46f and 46g are formed.

  The service plug 47 provided at a position facing the opening 14a of the cover 14 includes a first half 49 fixed to the front wall 15a of the front holding member 15 with two bolts 48, 48, and a first half 49. The second half 50 is detachable from the body 49. The first half 49 is provided with a locking pin 51 protruding in the horizontal direction, and the second half 50 is formed with a pin hole 50a that can be fitted to the pin 46h of the stopper member 46. A lock lever 53 is pivotally supported on the second half 50 via a support shaft 52, and the lock lever 53 is arcuately engageable with the locking pin 51 of the first half 49. The cam groove 53a is formed.

  As shown in FIGS. 2, 3, 8 and 12, three through holes 14 c are formed along the front end of the cover 14, and locking means 54 for locking these through holes 14 c. Is integrally provided at the front end of the case 13. The locking means 54 includes a flange portion 54a projecting forward from the front end of the case 13 and a first connecting portion 54c connected via a bendable first hinge portion 54b formed thinly at the tip of the flange portion 54a. A second connecting portion 54e connected to the tip of the first connecting portion 54c through a thin bendable second hinge portion 54d, and three provided at the tip of the second connecting portion 54e. The locking claws 54f are provided. In the flange portion 54a, three locking holes 54g are engageable with the three locking claws 54f.

  Accordingly, as shown in FIG. 8, with the cover 14 placed on the upper surface of the flange portion 54a of the case 13 via the seal member 55, the first and second hinge portions 54b and 54d are bent to engage the locking claw 54f. Is passed through the through-holes 14c of the cover 14 from the top to the bottom, and the engaging claws 54f are engaged with the engaging holes 54g of the flange portion 54a so that the front portion of the cover 14 is attached to the case 13. Can be fixed.

  As shown in FIGS. 2 to 4, a pair of left and right pushing members 56, 56 are provided at the front portion of the battery pack 12. Each pusher member 56 includes a rear pusher member 56a and a front pusher member 56b. The right rear pusher member 56a is formed by projecting a part of the front wall 15a of the front holding member 15 in a rectangular parallelepiped block shape, The left rear pushing member 56a is formed by bending the left end portion of the front wall 15a of the front holding member 15 so as to protrude forward. The pair of left and right front pushing members 56b and 56b are formed by projecting a part of the front wall 13c of the case 13 in a rectangular parallelepiped block shape.

  The right rear pushing member 56a and the front pushing member 56b are arranged so as to overlap in the front-rear direction, and the left rear pushing member 56a and the front pushing member 56b are arranged so as to overlap in the front-rear direction. The longitudinal dimension f of the pushing member 56 or the longitudinal dimension g of the rear pushing member 56a is set larger than the longitudinal dimension of the junction board 24 (see FIG. 4). As a result, the junction board 24 is housed in a space surrounded by the front wall 15a of the front holding member 15, the front wall 13c of the case 13, and the left and right rear pushing members 56a and 56a. The left and right front push-in members 56b and 56b are set to be higher than the left and right rear push-in members 56a and 56a.

  As shown in FIGS. 1 to 3, the three-phase AC line 57 extending forward from the PCU 23 is drawn out from a grommet 58 provided on the front wall 13 c of the case 13, and then the front wall of the recess 11 a of the floor panel 11. The motor / generator is connected through a hole 11c (see FIG. 1) formed in 11b. A part of the front wall 13c of the case 13 is recessed backward between the front wall 13c of the case 13 provided with the grommet 58 and the hole 11c formed in the front wall 11b of the recess 11a of the floor panel 11. A space β (see FIG. 3) is formed. Also, the front holding member 15 is partially recessed rearward in accordance with the recess of the case 13.

  Due to this space β, when the PCU 23 moves forward due to the collision load of the rear collision, the three-phase AC line 57 is sandwiched between the front wall 13c of the case 13 and the front wall 11b of the recess 11a of the floor panel 11 and is damaged. Can be prevented.

  Next, the operation of the embodiment of the present invention having the above configuration will be described.

  To remove the cover 14 from the case 13 that houses the battery modules 20... And the PCU 23, first, the two bolts 48, 48 are loosened, the lid 14b is removed from the opening 14a of the cover 14, and the service plug 47 exposed to the opening 14a is removed. After the lock lever 53 of the second half 50 is raised around the support shaft 52 to release the lock, the second half 50 is pulled out from the first half 49 through the opening 14a and separated (see FIG. 6). As a result, the electrical contacts in the service plug 47 become non-contact, the battery modules 20 are electrically disconnected, and a safe state is achieved even if the inside of the case 13 is touched. From this state, the cover 14 can be removed by loosening the six bolts 44 that are screwed into the front holding member 15 and the rear holding member 16.

  Before the second half 50 of the service plug 47 is pulled out, the pin hole 50a of the second half 50 is fitted to the pin 46h of the stopper member 46 from above. The situation where the stopper 14 integral with the cover 14 interferes with the second half 50 and the cover 14 is inadvertently removed can be avoided.

  In order to attach the cover 14, the cover 14 is placed on the case 13 and fixed to the front holding member 15 and the rear holding member 16 with bolts 44. The lock lever 53 may be tilted horizontally in a state where the second half 50 is inserted and positioned with respect to the first half 49 so that the pin hole 50a is fitted to the locking pin 51. Then, the cam groove 53a of the lock lever 53 slides along the locking pin 51 of the first half 49, so that the second half 50 is pushed into the first half 49 and coupled to the cam groove 53a. The second half 50 is locked so as not to come off by engagement with the locking pin 51, and the battery modules 20 are electrically connected to the PCU 23 and the like.

  Finally, after fixing the lid 14 b with the bolts 48, 48, the front end of the cover 14 is fixed to the case 13 with the locking means 54. That is, the first and second hinge portions 54b and 54d of the locking means 54 are bent to swing the first and second connecting portions 54c and 54e above the cover 14, and are provided at the tip of the second connecting portion 54e. The three locking claws 54f are engaged with the three locking holes 54g of the flange portion 54a.

Now, when the vehicle is collided from the rear, a collision load is first input to the cooling fan 27 located at the rearmost of the battery packs 12 housed in the recess 11a of the floor panel 11 of the trunk room at the rear of the vehicle body. While collision load inputted to the cooling fan 27 is transmitted to the rear holding member 16 through a stay 31, together with the stay 31 has a body portion 31a surrounding the cooling fan 27, the strength of that is in the rear holding member 16 Since it is set to be lower than the strength, the stay 31 is deformed so as to move the cooling fan 27 forward and absorbs the impact, so that the rear holding member 16 is prevented from being deformed.

  The battery modules 20... And the PCU 23 housed in the case 13 are connected by cables via the junction board 24, but the collision load of the rear collision is transmitted from the cooling fan 27 to the PCU 23 positioned in front of the PCU 23. If the position of the battery module 20 is shifted forward, the cable connecting the PCU 23 and the battery module 20 may be disconnected and a ground fault may occur.

  However, according to the present embodiment, the stay 31 is easily deformed to absorb the impact, so that the collision load is difficult to reach the rear holding member 16 and the PCU 23 in front of the rear holding member 16, and the cable is not broken due to the movement of the PCU 23. Can be prevented. Moreover, the main body 31 a of the stay 31 includes a fragile bent portion 31 d that bends in a mountain shape between a welded portion 31 b that is fixed to the rear holding member 16 and a flange portion 31 c that is fixed to the cooling fan 27. Therefore, the bent portions 31d can be easily buckled by the collision load to absorb the impact. At this time, the tops of the angle-shaped bent portions 31d... Face the outside of the stay 31. Therefore, the stay 31 is deformed to the outside, and the interference with the cooling fan 27 is avoided.

  In particular, according to the present embodiment, the rear holding member 16 has a portion located in front of the cooling fan 27 bent forward with respect to the other portions (see FIG. 3). The distance that the cooled cooling fan 27 can move forward without interfering with the rear holding member 16 is increased, and the collision load becomes more difficult for the rear holding member 16.

  When the cooling fan 27 moves forward while deforming the stay 31, the diameter a of the fan rotor 35 is set smaller than the diameter b of the through hole 16 b of the rear holding member 16 and the diameters of the front casing 33 and the rear casing 34. Since c is set larger than the diameter b of the through hole 16b (see FIG. 5), the front casing 33 and the rear casing 34 made of synthetic resin, which is vulnerable to the cooling fan 27, interfere with the surroundings of the through hole 16b and are destroyed. The fan rotor 35 having higher strength than the rear holding member 16 is fitted into the through hole 16 b without interfering with the rear holding member 16. With the above dimensional relationship, the fan rotor 35 can be reliably fitted into the through hole 16b of the rear holding member 16 while the rigidity of the rear holding member 16 is secured by minimizing the diameter of the through hole 16b.

  As described above, the fan rotor 35 is prevented from pressing and deforming the rear holding member 16, and the PCU 23 located in front of the fan rotor 35 is pushed by the rear holding member 16 to the battery modules 20. Misalignment is eliminated and cable breakage is prevented. When the collision load is large, the entire rear holding member 16 moves forward with the fan rotor 35 fitted in the through hole 16b. However, the PCU 23 and the battery modules 20 are pushed by the rear holding member 16 to be integrated. Since they move forward, their positional relationship does not shift.

  Further, since the front-rear direction distance d from the rear end of the through hole 16b of the rear holding member 16 to the rear end of the PCU 23 is set larger than the front-rear direction thickness e of the fan rotor 35 (see FIG. 5), Even when the fan rotor 35 moved forward by the collision load is completely fitted into the through hole 16b of the rear holding member 16, a gap remains between the front end of the fan rotor 35 and the rear end of the PCU 23. It is possible to reliably prevent the PCU 23 from moving forward.

  In addition, since cell voltage sensors 25 and 25 to which a high voltage is applied are provided on the rear surface of the rear wall 16a of the rear holding member 16, a ground fault occurs when the cell voltage sensors 25 and 25 are damaged by a collision load of a rear collision. May occur. However, according to the present embodiment, the sensor cover 26 is fixed to the rear surface of the rear wall 16a of the rear holding member 16, and the cell voltage sensors 25, 25 are disposed between the rear holding member 16 and the sensor cover 26. By transmitting the collision load of the collision to the rear holding member 16 via the sensor cover 26, a space for protecting the cell voltage sensors 25, 25 is secured between the sensor cover 26 and the rear holding member 16, and the cell voltage sensor 25, 25 damage can be prevented.

  The four battery modules 20 are each provided with four frames 29 extending in the front-rear direction at the four corners, and these frames 29 connect the front surface of the rear holding member 16 and the rear surface of the front holding member 15. In addition, since the strength of the sensor cover 26, the rear holding member 16 and the frame 29 is substantially the same, the collision load input to the rear holding member 16 is transmitted to the front holding member 15 via the frame 29 ... Can be dispersed.

  At this time, since the sensor cover 26 includes the protruding portions 41A, 41B, 41C, and 41D that are fixed to the rear surface of the rear holding member 16, the space that protects the cell voltage sensors 25 and 25 by the protruding portions 41A, 41B, 41C, and 41D. Since the three protrusions 41A, 41C, 41D are aligned with the frame 29 of the battery module 20 in the front-rear direction (see FIG. 3), the collision load is projected on the protrusions 41A, 41C, 41D. Can be reliably transmitted to the frame 29.

  When the front holding member 15 to which the collision load of the rear collision is transmitted through the frame 29 of the battery module 20 advances, the lower part of the stopper member 46 fixed to the lower surface of the cover 14 is moved forward by the front holding member 15. (See FIG. 7). At this time, if the strength of the stopper member 46 is higher than the strength of the cover 14, the front portion of the cover 14, that is, the front portion of the front holding member 15 is fixed upward with respect to the position fixed with the bolts 44. May be lifted and a gap may be generated between the cover 14 and the case 13. If such a gap occurs, there is a risk of touching a high voltage portion such as the battery module 20 when the operator inserts a hand into the gap.

  However, according to the present embodiment, when the stopper member 46 is pressed forward by the front holding member 15, the stopper member 46 is fixed to the lower surface of the cover 14 by the welded portions 46 d and 46 e located at the rear, and Since the space is provided above the notches 46f and 46g located in the front, the front portion of the cover 14 is prevented from being lifted upward by the bending of the stopper member 46 toward the front upper direction.

  Further, since the front portion of the cover 14 is fixed to the case 13 by the locking means 54, the locking means 54 also prevents the front portion of the cover 14 from being lifted. In addition, even if the front portion of the cover 14 is lifted, the locking means 54 has first and second connecting portions extending in the vehicle width direction along the front end of the case 13 between the flange portion 54a and the locking claws 54f. 54c and 54e (see FIG. 8), the first and second connecting portions 54c and 54e cover the gap between the cover 14 and the case 13 from the front, so that the operator inserts his hand into the gap. Is reliably prevented.

  The locking claws 54f are connected to the flange portion 54a via the first hinge portion 54b, the first connecting portion 54c, the second hinge portion 54d, and the second connecting portion 54e. The front part of the cover 14 fixed to the upper surface of the front holding member 15 with bolts 44... Swings backward with the bolts 44. Swings upward. As described above, the movement direction of the locking claws 54f and the movement direction of the front portion of the cover 14 are different, so that when the cover 14 is lifted upward, the locking claws 54f. This prevents the cover 14 from being lifted more reliably.

  Further, the total positive terminals 30A and the total negative terminals 30B of the battery modules 20 are exposed on the front surface of the front holding member 15 (see FIG. 2), but the locking means 54 is disposed in front of the total positive terminals 30A. Therefore, the operator's finger is prevented from touching the total plus terminal 30A by being blocked by the locking means 54. Further, since the locking means 54 is provided integrally with the case 13, the locking means 54 is not separated from the case 13 even when the locking claws 54f are removed from the locking holes 54g. The situation where the means 54 is dropped or lost can be avoided in advance.

  When the front holding member 15 is pushed forward by the frame 29 of the battery module 20 that moves forward due to the collision load of the rear collision, the junction board 24 supported on the front surface of the front wall 15a of the front holding member 15 is moved to the floor. Although there is a risk of being pinched and damaged between the front wall 11b of the recess 11a of the panel 11, according to the present embodiment, the front wall 15a of the front holding member 15 faces the front wall 11b of the recess 11a. Since the push-in member 56 is provided and the longitudinal dimension of the push-in member 56 is set larger than the longitudinal dimension of the junction board 24 (see FIG. 4), the push-in member 46 abuts against the front wall 11b of the recess 11a and stretches. The junction board 24 can be positioned in the formed space to prevent damage.

  At this time, if the pushing member 56 is not divided into two parts, the rear pushing member 56a and the front pushing member 56b, when the front end of the pushing member 56 slides forward and upward along the front wall 11b of the inclined recess 11a. In addition, the rear end of the pushing member 56 may be broken at the connection portion with the front holding member 15, and the function may not be performed. However, according to the present embodiment, since the pushing member 56 is divided into the rear pushing member 56a and the front pushing member 56b, the connection between the front pushing member 56b and the front wall 13c of the case 13 is disconnected. In addition, the front pushing member 56b sandwiched between the front wall 11b and the case 13 and the rear pushing member 56a fixed to the front holding member 15 are stretched to secure a space for protecting the junction board 24. The function of the pushing member 56 is maintained.

  In addition, since the height of the front pushing member 56b is set larger than the height of the rear pushing member 56a, even if the connection between the front pushing member 56b and the front wall 13c of the case 13 is disconnected, the rear pushing member The load of 56a can be transmitted to the front wall 11b of the recessed part 11a via the front pushing member 56b, and the function of the pushing member 56 can be exhibited reliably.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the storage battery of the present invention is not limited to the lithium ion battery of the embodiment.

  The high voltage member of the present invention is not limited to the PCU 23 of the embodiment.

  The auxiliary machine of the present invention is not limited to the cooling fan 27 of the embodiment, and may be a highly rigid member such as a small motor or a control device housed in a strong case.

  Even if only one of them is provided without providing both the bent portion 31d of the stay 31 and the through hole 16b of the rear holding member 16, the same effect can be achieved although there is a difference in degree.

  In the embodiment, the cooling fan 27 is located behind the PCU 23, but it may be located behind the battery module 20. In this case, the rear holding member 16 is bent forward at the portion sandwiched between the cooling fan 27 and the battery module 20.

12 Battery pack (power storage device)
15 Front holding member 16 Rear holding member 16b Through hole 20 Battery module (storage battery group)
23 PCU (High Voltage Member)
27 Cooling fan (auxiliary machine)
31 stays
31a body portion 31b welded portion (fixed portion)
31c Flange (fixed part)
31d bent part 35 fan rotor

Claims (5)

A power storage device (12) mounted on a rear part of a vehicle body includes a storage battery group (20), a high voltage member (23) connected to the storage battery group (20) via a cable, and the storage battery group (20). And a front holding member (15) and a rear holding member (16) fixed to the vehicle body by holding the high voltage member (23) from the front and rear, and a stay (31 on the rear surface of the rear holding member (16). A power storage device for a vehicle comprising an auxiliary machine (27) attached via
The stay (31) has a main body (31a) surrounding the periphery of the auxiliary machine (27), and has a lower strength against a load in the front-rear direction than the rear holding member (16). Power storage device.   The stay (31) includes a bent part (31d) between a fixing part (31b) to the rear holding member (16) and a fixing part (31c) to the auxiliary machine (27). The power storage device for a vehicle according to claim 1.   The power storage device for a vehicle according to claim 2, wherein the bent portion (31d) has a top portion at a tip bent radially outward.   The auxiliary machine (27) is disposed at a position aligned in the front-rear direction with respect to the storage battery group (20) or the high voltage member (23), and the rear holding member (16) faces the auxiliary machine (27). The power storage device for a vehicle according to any one of claims 1 to 3, wherein a portion to be bent is bent forward.   The auxiliary machine (27) is a cooling fan, and the rear holding member (16) positioned in front of the fan rotor (35) of the cooling fan has a through hole (16b) into which the fan rotor (35) can be fitted. The vehicle power storage device according to claim 4, further comprising:

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