JP2017196960A - Battery mounting structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure of a vehicle that can transmit a load while dispersing the load.SOLUTION: In a battery mounting structure of a vehicle 1, in which skeleton members 5 extending in a longitudinal direction of the vehicle 1 are provided at both left and right sides of the vehicle 1 and a battery pack 7 having laminates 8 having a plurality of single cells 14 laminated and integrated in one direction is installed at a lower side of the vehicle 1, the battery pack 7 is arranged between the skeleton members 5 provided at both left and right sides of the vehicle 1, the plurality of laminates 8 are arranged in parallel at predetermined intervals 10 and 11 in a lateral direction of the vehicle 1 and in a longitudinal direction of the vehicle 1 inside the battery pack 7, and a filling member 19 is arranged at a space in a cross shape formed between the plurality of laminates 8 arranged in parallel in the lateral direction of the vehicle 1 and in the longitudinal direction of the vehicle 1, where the filling member 19 is formed in the cross shape.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a battery mounting structure of a vehicle, and more particularly to a structure for mounting a battery that stores and discharges electric power for traveling of the vehicle.

  Patent Document 1 discloses a structure in which a plurality of batteries are arranged on the lower side of a floor panel. In the structure disclosed in Patent Document 1, side sills extending in the front-rear direction of the vehicle are provided on both sides of the floor panel. Between the side sills, a plurality of first battery units in which a plurality of batteries are stacked in the vertical direction and a second battery unit in which a plurality of batteries are stacked in the vehicle transverse direction are provided. These first battery units are arranged side by side at predetermined intervals in the left-right direction and the front-rear direction of the vehicle.

International Publication No. 2010/098271

  In the configuration described in Patent Document 1, when a side collision or the like occurs in one side sill, the first battery unit disposed on one side sill receives an impact force, and the line of action of the impact force is applied. The impact force is transmitted to a part of the other side sill on the side opposite to the portion where the side collision has occurred through the other first battery units arranged in the direction. That is, since one side sill, each battery unit, and the other side sill arranged in the direction of the action line described above transmit the load accompanying the collision, when the load to be transmitted is large, the one side sill, It is necessary to reinforce each battery unit and the other side sill to increase their rigidity against the transmitted load.

  The present invention has been made paying attention to the above technical problem, and an object of the present invention is to provide a vehicle battery mounting structure capable of distributing and transmitting a load.

  In order to achieve the above object, according to the present invention, a skeleton member extending in the front-rear direction of the vehicle is provided on both left and right sides of the vehicle, and a plurality of single cells are stacked in one direction on the lower side of the vehicle. In a battery mounting structure for a vehicle to which a battery pack having an integrated laminated body is attached, the battery pack is disposed between the skeleton members provided on the left and right sides of the vehicle, and the battery pack is disposed inside the battery pack. A plurality of the stacked bodies are arranged side by side with a predetermined interval in the left-right direction of the vehicle and the front-rear direction of the vehicle, and a plurality of layers arranged side by side in the left-right direction of the vehicle and the front-rear direction of the vehicle A stuffing member is disposed in a cross-shaped gap formed between the laminated bodies, and the stuffing member has a cross shape.

  According to the present invention, the cross-shaped gap is formed between the stacked bodies arranged in the left-right direction and the front-rear direction of the vehicle inside the battery pack, and the gap is packed by the cross-shaped packing member. ing. The battery pack described above is provided between the skeleton members disposed on the left and right sides of the vehicle. Therefore, for example, when a side collision or the like occurs in one skeleton member and any of the stacked bodies receives an impact force, a plurality of stacks arranged in the direction of the line of action of the impact force via a cross-shaped packing member Distribute and transmit impact force to the body. As a result, the load transmitted by each laminate is reduced. And the load accompanying the said collision is transmitted to the wide range in the other skeleton member on the opposite side to the one skeleton member in which the side collision has occurred through each laminate. Therefore, it is possible to suppress the load from being concentrated on a part of the other skeleton member, and to reduce the deformation amount, that is, the collision stroke, at a plurality of locations where the load is transmitted to the other skeleton member. As a result, since the entire battery pack receives a collision load, the impact resistance strength of the battery pack as a whole can be improved, and the above-described collision stroke can be reduced. In addition, since the stuffing member is arrange | positioned in the clearance gap mentioned above, it can suppress that each laminated body moves by the vibration accompanying driving | running | working of a vehicle.

It is a bottom view which shows an example of the lower structure of the vehicle to which this invention is applied. It is a perspective view which shows an example of a battery module. It is a perspective view which shows an example of a cross-shaped packing member. It is a figure which shows the back surface of the 1st stuffing member shown in FIG. It is a figure which shows typically an example of the transmission path | route of the load in embodiment of this invention. It is a figure which shows the other example of the filling member in embodiment of this invention. It is a reference example which connected each battery module by the bracket. It is another reference example which connected each battery module by the end plate arrange | positioned adjacent to each other in the left-right direction of the vehicle.

  FIG. 1 is a bottom view showing an example of a lower structure of a vehicle 1 to which the present invention is applied. In FIG. 1, the arrow FR direction indicates the front direction in the vehicle longitudinal direction, and the arrow LH direction indicates the left direction in the vehicle width direction. As shown in FIG. 1, the vehicle 1 includes, for example, a traveling device 3 and a traveling controller 4 mounted in a front compartment 2. The traveling device 3 is a device that outputs a driving force for the vehicle 1 to travel, and includes a power transmission device such as an engine and a motor and a power transmission device such as a transmission. The travel controller 4 also includes a controller for controlling the fuel injection amount, ignition timing, throttle opening, etc. of the engine, a control device such as an inverter and converter for controlling the motor current and the rotational speed, and control signals to the control device. Is provided.

  The vehicle 1 includes a pair of side sills (sometimes referred to as rockers) 5 extending in the front-rear direction of the vehicle 1 on both sides in the vehicle width direction. A floor panel (not shown) is provided so as to cover a portion between the side sills 5. In addition, a pair of floor cross reinforcements (hereinafter simply referred to as floor crosses) 6 are arranged in parallel to each other at a predetermined interval on both front and rear sides of the vehicle 1 in the front-rear direction with the substantially central portion of the side sill 5 interposed therebetween. Yes. The floor cloth 6 is a reinforcing member arranged in the vehicle width direction of the vehicle 1 and has a hat-shaped cross section (or cup-shaped cross section) that is extrusion-molded or press-molded. The opening end side is attached to the bottom surface of the floor panel so as to be in close contact with the floor panel, and both end portions in the longitudinal direction are fixed to the side sill 5. The spacing between the floor cloths 6 is somewhat larger than the width of a battery module (described later) in the front-rear direction of the vehicle 1. This is because the battery module is arranged between the floor cloths 6.

  A battery pack 7 serving as a power source for traveling is mounted on the lower part of the vehicle 1. In the example shown here, the battery pack 7 is disposed between the pair of side sills 5 and on the lower surface side of the floor panel. The battery pack 7 is formed by stacking a plurality of single cells to form a battery module 8, storing the plurality of battery modules 8 in a rectangular parallelepiped case 9, and appropriately connecting the battery modules 8 in series or in parallel. It is comprised so that electric power can be taken out outside. In the example shown in FIG. 1, ten battery modules 8 are arranged in a matrix of five rows in the front-rear direction and two columns in the width direction in parallel with each other at predetermined intervals in the left-right direction and the front-rear direction of the vehicle 1. Are arranged in a shape. Each battery module 8 is fixed to the case 9.

  In the example shown in FIG. 1, one first space 10 that is continuous in the front-rear direction of the vehicle 1 is formed at the center of the case 9 in the left-right direction of the vehicle 1. Second spaces 11 orthogonal to the first space 10 and continuing in the left-right direction of the vehicle 1 are formed on both front and rear sides of each battery module 8. A predetermined interval is provided between the inner wall surface of the case 9 in the front-rear direction of the vehicle 1 and the battery module 8 disposed adjacent thereto. Therefore, in the example shown in FIG. 1, six second spaces 11 are formed, and there are six locations where the second spaces 11 and the first spaces 10 intersect (hereinafter simply referred to as intersections). Is formed. Of the six second spaces 11 described above, the intersections between the two second spaces 11 and the first spaces 10 formed along the inner wall surface of the case 9 in the front-rear direction of the vehicle 1 described above are “ It has a “T” shape, and the other crossing portions have a cross shape. At the crossing portions, a stuffing member having a shape corresponding to the shape of each crossing portion is arranged. The movement of each battery module 8 in the case 9 is suppressed by these packing members, and a load is transmitted between the battery modules 8. The filling member will be described later.

  A battery ECU 12 is provided for each battery module 8. As shown in FIG. 1, the battery module 8 is disposed adjacent to the battery module 8 on the rear side in the front-rear direction of the vehicle 1 with respect to the battery module 8. The battery ECU 12 is electrically connected to the battery module 8 via a harness (not shown). The battery ECU 12 measures the voltage of each single cell, and performs voltage equalization control for equalizing the voltage of the single cell based on the measured voltage.

  Here, the structure for attaching the battery pack 7 to the vehicle body and the structure of the battery module 8 will be described. A portion of the upper surface of the case 9 of the battery pack 7 that faces the floor cloth 6 is recessed inward of the battery pack 7 following the shape of the floor cloth 6 and forms a concave groove portion (not shown). A floor cloth 6 is disposed in the concave groove. The portion where the concave groove portion is formed is a portion between the battery modules 8 arranged with a space in the front-rear direction of the vehicle 1. For example, the battery pack 7 is fixed to the lower surface side of the floor panel by nuts fixed to the floor cloth 6 and bolts penetrated from the lower surface side of the battery pack 7. As shown in FIG. 1, the fixing points 13 by the bolts and nuts are provided in two places on both sides at a predetermined interval with the center portion in the longitudinal direction (vehicle width direction) of the floor cloth 6 as shown in FIG. 1. It has been. A flange portion (not shown) may be provided on the side end portion of the case 9 and the battery pack 7 may be fixed to the side sill 5 by the flange portion.

  FIG. 2 is a perspective view showing an example of the battery module 8. In FIG. 2, the arrow FR direction indicates the front direction of the vehicle 1 in the longitudinal direction, the arrow LH direction indicates the left direction of the vehicle width direction, and the arrow UP direction indicates the upward direction of the vehicle vertical direction. Yes. As shown in FIG. 2, the battery module 8 includes a battery stack 15 in which a plurality of flat single cells 14 are stacked, a pair of end plates 16 disposed at both ends in the stacking direction of the battery stack 15, and a battery. The stack 15 is provided with a pair of tension plates 18 sandwiching the stack 15 from above and below and having both ends in the longitudinal direction connected to the end plate 16 by bolts 17 respectively. The single cell 14 is a so-called all-solid battery using a solid electrolyte, and is firmly adhered to the pair of end plates 16 by tightening bolts 17.

  FIG. 3 is a perspective view showing an example of the cross-shaped filling member described above. In FIG. 3, the arrow RR direction indicates the rear direction in the front-rear direction of the vehicle 1, and the arrow RH direction indicates the right direction in the vehicle width direction. As shown in FIG. 3, a cross-shaped first filling member 19 is disposed at a location where the first space 10 and the second space 11 intersect in a cross shape. The thickness or height of the first filling member 19 is set to be approximately the same as or slightly higher than the height of each battery module 8. The first stuffing member 19 is disposed in the first space 10 and has a first stuffing portion 19A having a width substantially the same as the width of the first space 10, and the second space 11 and the width of the second space 11. The first stuffing portion 19A and the second stuffing portion 19B are configured in a cross shape substantially orthogonal to each other. Therefore, four “L” -shaped corners 19C are formed by the first filling portion 19A and the second filling portion 19B. When the first filling members 19 are arranged at the cross-shaped crossing portions described above, the corner portions of the battery modules 8 positioned on the center side in the left-right direction of the vehicle 1 are located at the corner portions 19C of the “L” shape. Each is arranged. By doing so, the four battery modules 8 arranged in the left-right direction and the front-rear direction of the vehicle 1 with the first packing member 19 interposed therebetween are connected to each other via the first packing member 19.

  As shown in FIG. 1, a “T” -shaped second stuffing member 20 is arranged at a location where the first space 10 and the second space 11 intersect in a “T” shape. . The second stuffing member 20 is disposed in the first space 10 and is disposed in the first space 20A having the same width as the width of the first space 10 and in the second space 11 along the inner wall surface of the case 9. The second stuffing portion 20B having a width substantially the same as the width of the second space 11 is formed, and the stuffing portions 20A and 20B form the “T” -shaped second stuffing member 20, which is the above-mentioned “T” Is located at the crossover of the shape. Therefore, at the “T” -shaped intersection, the two battery modules 8 arranged in the left-right direction of the vehicle 1 with the second stuffing member 20 interposed therebetween are connected to each other via the second stuffing member 20, Those battery modules 8 are connected to the case via the second filling member 20.

  FIG. 4 is a view showing the back surface of the first filling member 19 shown in FIG. 3. In FIG. 4, the arrow FR direction indicates the front direction in the front-rear direction of the vehicle 1, and the arrow LH direction indicates the left direction in the vehicle width direction. As shown in FIG. 4, a plurality of ribs 19 </ b> D for improving the rigidity of the first stuffing member 19 are provided on the back surface of the first stuffing member 19, that is, below the first stuffing member 19 in the vertical direction of the vehicle 1. The ribs 19D are formed so as to extend in the width directions of the filling portions 19A and 19B. Moreover, it forms along the diagonal line which connects between each corner | angular part 19C arrange | positioned adjacent to each other, and two each corner | angular part 19C among the four corner | angular parts 19C.

  Next, functions and effects of the above-described embodiment will be described. FIG. 5 is a diagram schematically showing an example of a load transmission path in the embodiment of the present invention. When a side collision or the like occurs on one side sill 5, a large load A accompanying the collision is applied to a part of the one side sill 5. One side sill 5 is deformed to some extent to reduce the impact force. The collision load A is transmitted from one side sill 5 to the battery pack 7. The collision load A is transmitted to the battery module 8 through the case 9 of the battery pack 7. The battery module 8 to which the collision load A is first transmitted from one side sill 5 is referred to as a battery module 8A in the following description. The battery module 8 </ b> A tends to move to the side opposite to the location where the side collision occurs in the left-right direction of the vehicle 1 due to the impact force. However, the first filling member 19 is disposed between the battery module 8A and the battery module 8B that is disposed adjacent to the vehicle 1 in the left-right direction. Therefore, the movement of the vehicle 1 in the left-right direction is suppressed by the first filling member 19.

  The collision load A transmitted to the battery module 8A is in contact with the battery module 8A via the first stuffing member 19, and is arranged in the direction of the line of action of the collision load A. , 8D are distributed and transmitted. That is, the battery module 8B described above and the battery modules 8C and 8D that are arranged in the front-rear direction of the vehicle 1 in the front-rear direction of the vehicle module 8B and connected to the battery module 8A via the first filling member 19 are dispersed. Is transmitted. In FIG. 5, the collision load transmitted by each of the battery modules 8B, 8C, and 8D is indicated by the symbol B. The collision load B transmitted by the plurality of battery modules 8A, 8B, 8C, 8D is smaller than the collision load A, and is opposite to the location where the side collision has occurred via these battery modules 8A, 8B, 8C, 8D. The collision load B is transmitted to a wide range in the other side sill 5 on the side. Therefore, it is possible to suppress the collision load A from being concentrated on a part of the other side sill 5. Moreover, since the collision load B is transmitted to a wide range in the other side sill 5, the deformation amount, that is, the collision stroke, at the portion where the collision load B is transmitted can be reduced. As a result, the impact resistance strength of the battery pack 7 as a whole can be improved and the collision stroke can be reduced. Further, since reinforcement is not particularly required, the battery pack 7 can be reduced in weight. In addition, since the filling members 19 and 20 are packed in the gaps between the battery modules 8, it is possible to prevent or suppress the battery modules 8 from being vibrated due to vibration caused by traveling of the vehicle.

  FIG. 6 is a view showing another example of the filling member in the embodiment of the present invention. The example shown here is an example in which a harness is passed through the first cross-shaped filling member 19. As shown in FIG. 6, a through hole 21 is formed along the length direction of the first filling portion 19 </ b> A in the first filling member 19, and a harness 22 that connects each battery module 8 in series or in parallel to the through hole 21. Is passed. If it is such a structure, the harness 22 can be protected from the big external force which arises at the time of a collision, etc. by the 1st filling member 19 being what is called a strength member for transmission of a load.

  FIG. 7 is a reference example in which each battery module is connected by a bracket. The bracket 23 in the example shown in FIG. 7 is a rectangular plate and is provided corresponding to the cross-shaped crossing portion. The corner portions of the battery module 8 corresponding to the respective corner portions of the bracket 23 are fixed to the respective corner portions of the bracket 23 by, for example, bolts and nuts. In FIG. 7, the fixed portion is indicated by reference numeral 24. In short, it is only necessary that the four battery modules 8 arranged parallel to each other in the left-right direction and the front-rear direction of the vehicle 1 around the cross-shaped intersection are connected to each other via the bracket 23. Even in the “T” -shaped crossing portion, two battery modules 8 arranged in parallel to each other in the left-right direction of the vehicle 1 may be connected to each other via the bracket 23. With such a configuration, the collision load A can be distributed and transmitted between the battery modules 8 via the bracket 23, so that the same operation and effect as the configuration shown in FIGS. 1 and 3 can be obtained. it can. Further, the spaces 10 and 11 between the battery modules 8 can be maintained by the bracket 23. Therefore, the harness 22 described above can be disposed in the spaces 10 and 11 described above to protect the harness 22 from external force.

  FIG. 8 is another reference example in which the battery modules are connected by end plates arranged adjacent to each other in the left-right direction of the vehicle 1. In the example shown in FIG. 8, each end plate 16 disposed on the center side in the left-right direction of the vehicle 1 is formed in a crank shape as a whole. That is, a fastening portion 16A that is disposed adjacent to the single cell 14 and to which the bolt 17 is fastened, and a flange portion 16B that is spaced apart from the fastening portion 16A and has a surface parallel to the fastening portion 16A. I have. The fastening portion 16A and the flange portion 16B are integrally formed, and the flange portion 16B is displaced from the fastening portion 16A in the front-rear direction of the vehicle 1. And the flange parts 16B of each end plate 16 arrange | positioned at the center side in the left-right direction of the vehicle 1 are mutually contacted, and those flange parts 16B are arrange | positioned adjacent to each other in the left-right direction of the vehicle 1. It is clamped by the fastening portion 16A. With such a configuration, when the above-described side collision occurs, the collision load A is distributed to each of the plurality of battery modules 8 connected via the end plates 16 combined with each other. Therefore, the same operation and effect as the configuration shown in FIGS. 1 and 3 can be obtained. Further, it is not necessary to provide the stuffing members 19 and 20, and the number of parts can be reduced accordingly.

  In addition, this invention is not limited to embodiment mentioned above, Comprising: The number of the battery modules in this invention is not restricted to the number shown by embodiment mentioned above, It can change suitably as needed. Further, the battery may be a storage battery other than the all solid state battery.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 5 ... Side sill (frame member), 7 ... Battery pack, 8 ... Battery module (laminated body), 10 ... 1st space (predetermined space | interval), 11 ... 2nd space (predetermined space | interval), 14 ... single cell, 19 ... first filling member (cross-shaped filling member).

Claims (1)

A skeleton member extending in the front-rear direction of the vehicle is provided on both left and right sides of the vehicle, and a battery pack having a laminated body in which a plurality of single cells are stacked in one direction and integrated is attached to the lower side of the vehicle. In the vehicle battery mounting structure,
The battery pack is disposed between the skeleton members provided on the left and right sides of the vehicle,
Inside the battery pack, a plurality of the stacked bodies are arranged side by side with a predetermined interval in the left-right direction of the vehicle and the front-rear direction of the vehicle,
A stuffing member is arranged in a cross-shaped gap formed between the plurality of stacked bodies arranged side by side in the left-right direction of the vehicle and the front-rear direction of the vehicle,
The battery mounting structure for a vehicle, wherein the filling member has a cross shape.

Images