JP2017196961A - Battery mounting structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure of a vehicle that can suppress a cable from being damaged.SOLUTION: In a battery mounting structure of a vehicle 1, in which skeleton members 5 are provided at both left and right sides of the vehicle 1 and a battery pack 6 having laminates 7 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 6 is arranged between the skeleton members 5, a first reinforcing member 11 extending in a longitudinal direction of the vehicle 1 and a second reinforcing member 12 extending in a width direction of the vehicle 1 are provided inside the battery pack 6, the first reinforcing member 11 and the second reinforcing member 12 are made to cross each other, the reinforcing members 11 and 12 are joined to each other at a portion 13 at which the members cross each other, a cable 24 electrically connected to the laminates 7 is arranged inside the first reinforcing member 11, the single cells 14 have a solid electrolyte sandwiched between a pair of electrodes, where the laminates 7 are constituted by pressing the plurality of single cells 14 in the laminate direction thereof to make the cells to closely adhere to each other.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 battery assembly in which a plurality of batteries are accommodated is disposed below a floor panel. The battery assembly includes a rectangular battery mounting frame, and a reinforcing member is provided inside the battery mounting frame. The reinforcing member is composed of a girder extending in the transverse direction of the vehicle and a beam extending in the front-rear direction of the vehicle and coupled to an intermediate portion of the girder, and has a “T” shape. A battery unit in which a plurality of batteries are stacked is disposed in a region partitioned by the reinforcing member, and a harness, a junction box, and the like that are electrically connected to each battery unit are provided above the beam.

International Publication No. 2010/098271

  Frame members (strength members) called side sills or rockers are provided on the left and right sides of the floor panel (left and right sides of the vehicle body). This type of skeletal member is deformed to some extent and relaxes the impact force when a large load is applied due to a side collision or the like. Therefore, when a side collision or the like occurs, a load accompanying the collision is applied to the battery mounting frame as the skeleton member is deformed, and the side opposite to the part where the side collision occurs via the reinforcing member girder The above-mentioned load is transmitted to. The harness and the junction box are exposed on the upper side of the beam, and are less rigid than the battery unit. Therefore, if the girder is deformed or the battery unit is displaced due to a large load accompanying the collision, the harness may be damaged by the girder or the battery unit.

  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 that can suppress cable damage.

  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 the left and right sides of the vehicle, and a plurality of single cells are laminated in one direction on the lower side of the vehicle. In the battery mounting structure of the vehicle to which the battery pack having the 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 includes the battery pack, A first reinforcing member extending in the front-rear direction of the vehicle and a second reinforcing member extending in the left-right direction of the vehicle are provided, and the first reinforcing member and the second reinforcing member are crossed, and The first reinforcing member and the second reinforcing member are coupled to each other at a crossing portion where the one reinforcing member and the second reinforcing member cross each other, and the laminated body is disposed inside the first reinforcing member. Electrical The single cell has a solid electrolyte sandwiched between a pair of electrodes, and the stacked body presses the plurality of single cells in the stacking direction. It is characterized by being in close contact with each other.

  According to this invention, the 1st reinforcement member extended in the front-back direction of a vehicle and the 2nd reinforcement member extended in the left-right direction of a vehicle are provided in the inside of a battery pack, These 1st reinforcement member and 2nd The reinforcing member is crossed and joined. That is, since the first reinforcing member and the second reinforcing member are crossed and joined, they are reinforced with each other, and the overall rigidity and impact resistance can be improved. Since the cable electrically connected to the laminated body is disposed inside the first reinforcing member, the cable can be protected from a large external force generated at the time of a collision or the like. The single cell is a so-called all-solid battery having a solid electrolyte, and its strength and rigidity are higher than those of other batteries using an electrolytic solution. Since the battery pack having the all solid state battery is disposed between the skeleton members and can function as the strength member, the overall rigidity of the vehicle can be improved.

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 sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a figure which shows an example which formed the 1st reinforcement member and the convex part integrally. It is a perspective view which shows an example of the crossing part of a 1st reinforcement member and a 2nd reinforcement member. It is a figure which shows typically an example of the transmission path | route of the load in embodiment of this invention. This is an example in which a second reinforcing member is abutted and joined to both sides of the first reinforcing member to form a cross-shaped crossing portion. It is a figure which shows an example which joined them in the state which prepared the height of the 1st reinforcement member, and the height of the 2nd reinforcement member, and comprised the crossing part.

  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 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. 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, which will be described later, is provided so as to cover a portion between the side sills 5. A battery pack 6 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 6 is disposed between the pair of side sills 5 and on the lower surface side of the floor panel.

  The battery pack 6 is formed by stacking a plurality of single cells to form a battery module 7, storing the plurality of battery modules 7 in a rectangular parallelepiped case 8, and appropriately connecting the battery modules 7 in series or in parallel and electric power. It is comprised so that it can take out outside. In the example shown in FIG. 1, ten battery modules 7 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. One first space 9 that is continuous in the front-rear direction of the vehicle 1 is formed at the center of the case 8 in the vehicle width direction. A second space 10 that is orthogonal to the first space 9 and continues in the vehicle width direction of the vehicle 1 is formed on both front and rear sides of each battery module 7. In the example shown in FIG. 1, six second spaces 10 are formed. Each battery module 7 is fixed to the case 8.

  The first reinforcing member 11 extending over the entire length is provided in the first space 9 described above, and the second reinforcing member 12 extending over the entire length is provided in each second space 10. The shapes of the first reinforcing member 11 and the second reinforcing member 12 will be described later. The second reinforcing member 12 and the first reinforcing member 11 are orthogonal to each other at the center of the second reinforcing member 12 in the vehicle width direction. Further, at the crossing portion (hereinafter simply referred to as a crossing portion) 13, the second reinforcing member 12 is disposed above the first reinforcing member 11 in the vertical direction of the vehicle 1. The members 11 and 12 are connected to each other. The means for the connection can be appropriately selected. For example, the connection can be performed by welding, brazing, riveting, bolting, or the like. In addition, you may form integrally by press molding. Further, as shown in FIG. 1, the intersecting portions 13 of the second reinforcing member 12 and the first reinforcing member 11 provided along the inner wall surface of the case 8 in the front-rear direction of the vehicle 1 have a “T” shape. The other crossing portions 13 have a cross shape. In the following description, the “T” -shaped crossing portion 13 is referred to as a crossing portion 13a, and the cross-shaped crossing portion 13 is referred to as a crossing portion 13b.

  Here, the structure for attaching the battery pack 6 to the vehicle body and the structure of the battery module 7 will be described. A flange portion (not shown) is provided at a side end portion of the case 8 of the battery pack 6, and the battery pack 6 is fixed to the side sill 5 by the flange portion. The means for fixing can be selected as appropriate. For example, the battery pack 6 is attached to the side sill 5 by a nut fixed to the side sill 5 and a bolt through which a bolt hole formed in the flange portion is penetrated from the bottom side. Can be fixed to.

  FIG. 2 is a perspective view showing an example of the battery module 7. In FIG. 2, the arrow FR direction indicates the front direction of the vehicle 1, 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 1. Show. As shown in FIG. 2, the battery module 7 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 the solid electrolyte is sandwiched between a pair of electrodes. Then, by tightening the bolts 17 described above, the bolts 17 are pressed by the pair of end plates 16 to be firmly attached. And the battery pack 6 is arrange | positioned between a pair of side sills 5 in the state which made the lamination direction of the single cell 14 and the vehicle width direction correspond. A battery ECU (not shown) is provided for each battery module 7. A battery ECU is disposed adjacent to the battery module 7 on the rear side in the front-rear direction of the vehicle 1 with respect to the battery module 7. The battery ECU is electrically connected to the battery module 7 and the travel controller 4 via a harness described later. The battery ECU 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.

  3 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 and 4 are shown upside down from FIG. 1 for easy viewing. The case 8 of the battery pack 6 includes an upper lid 19 and a bottom plate 20, and the battery pack 6 is fixed to the side sill 5 with the upper surface of the upper lid 19 facing the lower surface of the floor panel 21. As shown in FIG. 3 and FIG. 4, a groove-like convex portion 22 that protrudes below the vehicle 1 and extends in the front-rear direction of the vehicle 1 is formed at the center of the bottom plate 20 in the vehicle width direction. ing. This is to increase the rigidity of the bottom plate 20 or the case 8 and to avoid or suppress the contact or collision between the interference object and the battery module 7 on the road surface, as will be described later. The 1st reinforcement member 11 is attached to the baseplate 20 so that the opening part of the convex part 22 may be covered. As shown in FIGS. 3 and 4, the first reinforcing member 11 has a hat-shaped cross section or a cup-shaped cross section that is extrusion-molded or press-molded. Flange portions 11 a are formed on both sides of the opening, and are fixed to the bottom plate 20 in a state where the flange portions 11 a are in close contact with the bottom plate 20 of the case 8. The means for fixing can be appropriately selected. For example, the fixing can be performed by welding, brazing, adhesive, or the like. The space above the convex portion 22 is the first space 9 described above.

  The convex portions 22 described above are formed substantially symmetrical with respect to the first reinforcing member 11. The convex portion 22 and the first reinforcing member 11 constitute a housing portion 23 that extends in the front-rear direction of the vehicle 1. A harness 24 is disposed inside the housing portion 23. The harness 24 electrically connects the plurality of battery modules 7 and the battery ECU to the travel device 3 and the travel controller 4 described above. Moreover, the both sides of the convex part 22 in the baseplate 20 become the module mounting part 25 in which the battery module 7 is arrange | positioned, and is formed substantially flat. In addition, as shown in FIG. 5, you may comprise the convex part and 1st reinforcement member which were mentioned above integrally by extrusion molding, for example. If it comprises as shown in FIG. 5, a number of parts can be reduced and it can be easy to assemble as a whole. In FIG. 5, the upper and lower sides of FIG.

  FIG. 6 is a perspective view showing an example of a crossing portion 13 b between the first reinforcing member 11 and the second reinforcing member 12. The first reinforcing member 11 and the second reinforcing member 12 are orthogonal or substantially orthogonal, and in the example shown here, the second reinforcing member 12 is located above the first reinforcing member 11 in the vertical direction of the vehicle 1. Yes. As shown in FIG. 6, the second reinforcing member 12 has a hat-shaped cross section or a cup-shaped cross section that is extrusion-molded or press-molded, and both end portions of the opening portion are flange portions 12a. A concave portion 26 corresponding to the shape of the first reinforcing member 11 is formed in the central portion of the second reinforcing member 12 in the length direction, and the first reinforcing member 11 is fitted into the concave portion 26. The flange portion 12 a in the recess 26 is in close contact with the upper surface of the first reinforcing member 11. In this manner, the flange portion 12 a of the recess 26 is fixed to the upper surface of the first reinforcement member 11 with the recess 26 in close contact with the upper surface of the first reinforcement member 11. Further, the flange portions 12a in the portions on both sides of the concave portion 26 in the length direction of the second reinforcing member 12 are in close contact with the bottom plate 20, as shown in FIG. And it is being fixed to the baseplate 20 in the state which made those flange parts 12a contact | adhere to the baseplate 20. FIG. In addition, the means for fixing mentioned above can be selected suitably, for example, it can fix by welding, brazing, an adhesive material, etc. Similarly, the second reinforcing member 12 is also brought into close contact with and fixed to the first reinforcing member 11 and the bottom plate 20 in the crossing portion 13a having a “T” shape.

  Next, functions and effects of the above-described embodiment will be described. FIG. 7 is a diagram schematically showing an example of a load transmission path in the embodiment of the present invention. When a side collision occurs in 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. Accordingly, a collision load A is applied to the battery pack 6 from one side sill 5, and the collision load A is applied to the second reinforcing member 12 through the case 8 of the battery pack 6. Then, the collision load A is transmitted to the side opposite to the portion where the side collision has occurred via the second reinforcing member 12. Since the 1st reinforcement member 11 is couple | bonded with the center part of the 2nd reinforcement member 12, the 2nd reinforcement member 12 is reinforced by the 1st reinforcement member 11, and rigidity is improved. Therefore, even if a large load A accompanying the collision, that is, a compressive load acts on the second reinforcing member 12, deformation of the second reinforcing member 12 can be prevented or suppressed.

  When a front collision occurs and a collision load B is applied to the front side of the battery pack 6 in the front-rear direction of the vehicle 1, the collision load B is applied to the first reinforcing member 11 via the case 8 of the battery pack 6. It takes. The first reinforcing member 11 extends over the entire length of the case 8 in the front-rear direction of the vehicle 1 and is coupled to the plurality of second reinforcing members 12 via the crossing portions 13a and 13b. Therefore, the collision load B is transmitted to the rear side in the front-rear direction of the vehicle 1 via the first reinforcing member 11, and the plurality of second reinforcing members 12 extending in the left-right direction of the vehicle 1 via the crossing portions 13a, 13b. To be distributed. The collision load applied to each second reinforcing member 12 is indicated by symbol b in FIG. Since the collision load b acting on each second reinforcing member 12 is smaller than the collision load B, deformation of each second reinforcing member 12 can be prevented or suppressed. Moreover, it can prevent or suppress that the collision load B concentrates on each crossing part 13 mentioned above, and the 1st reinforcement member 11 and the 2nd reinforcement member 12 deform | transform.

  As a result, in the above-described embodiment, it is possible to prevent or suppress the damage of the harness 24 due to the large loads A and B accompanying the collision being concentrated on a part of each of the reinforcing members 11 and 12 and being deformed. Moreover, since the harness 24 is arrange | positioned inside the 1st reinforcement member 11 which is an intensity | strength member, it can prevent or suppress the harness 24 more effectively. Furthermore, since the convex part 22 which comprises a part of the accommodating part 23 mentioned above protrudes on the lower side of the vehicle 1, for example, when there is an interference object such as a block on the travel path, it is more than the battery pack 6. First, the protrusion 22 contacts or abuts against the interference. As a result, the battery pack 6 can be protected by the convex portion 22. Moreover, since the convex part 22 is extended in the front-back direction of the vehicle 1, it becomes difficult to become air resistance at the time of driving | running | working of the vehicle 1, and the aerodynamic characteristic in the lower side of the vehicle 1 is not deteriorated. In the above-described embodiment, the battery module 7 is a so-called all-solid-state battery, and the battery pack 6 having the battery modules 7 is disposed between the side sills 5, so that the battery pack 6 functions as a strength member. It is possible to improve the rigidity and impact resistance of the vehicle 1 as a whole.

  FIG. 8 is a diagram illustrating an example in which a cross-shaped crossing portion 13 b is configured by abutting and joining the second reinforcing member 12 to both sides of the first reinforcing member 11. In the example shown here, the length of each second reinforcing member 12 is set to be substantially the same as the length of the battery module 7 in the vehicle width direction. As shown in FIG. 8, a flange portion 12 b that contacts the upper surface of the first reinforcing member 11 is formed at one end of the second reinforcing member 12, and the first upper surface of the first reinforcing member 11 described above. Flange portions 12 b are brought into close contact with both sides of the reinforcing member 11. The first reinforcing member 11 is fixed in a state where the flange portions 12b are in close contact with each other. The means for fixing can be selected as appropriate, and can be fixed by welding, brazing, adhesive, or the like as described above. Similarly, the crossing portion 13 a having a “T” shape is also configured to be fixed in a state where the flange portions of the second reinforcing member 12 are in close contact with both sides of the first reinforcing member 11.

  FIG. 9 is a diagram illustrating an example in which the crossing portion 13b is configured by joining the first reinforcing member 11 and the second reinforcing member 12 in a state in which the first reinforcing member 11 and the second reinforcing member 12 are aligned. As shown in FIG. 9, a cross-shaped connector 27 is provided at each location where the first space 9 and the second space 10 intersect in a cross shape. The connector 27 can be formed by press molding, and the first reinforcing member 11 and the second reinforcing member 12 are fitted and fixed to respective end portions of the connector 27. The first reinforcing member 11 is divided in the front-rear direction of the vehicle 1, and the length of each first reinforcing member 11 is set to be substantially the same as the length of the battery module 7 in the front-rear direction of the vehicle 1. Further, the length of each second reinforcing member 12 is set to be substantially the same as the length of the battery module 7 in the vehicle width direction. The first reinforcing member 11 and the second reinforcing member 12 are connected to each other via the connector 27. The means for fixing described above can be selected as appropriate, and can be fixed by welding, brazing, adhesive, or the like as described above. A connector formed in a “T” shape is disposed at a location where the first space 9 and the second space 10 intersect in a “T” shape, and the first reinforcing member 11 and the second reinforcing member are disposed in the connector. 12 may be fitted and fixed respectively. With such a configuration, the dead space in the height direction in the case 8 can be reduced.

  In addition, this invention is not limited to embodiment mentioned above, Comprising: The number of the battery modules in this invention can be changed suitably as needed. The battery may be a storage battery other than an all solid state battery. Further, the second reinforcing member 12 is fixed in close contact with the bottom plate 20 in the vehicle width direction, and the first reinforcing member 11 is arranged above the second reinforcing member 12 in the vertical direction of the vehicle 1 at each crossing portion 13. May be.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 5 ... Side sill (frame member), 6 ... Battery pack (battery pack), 7 ... Battery pack (laminated body), 11 ... 1st reinforcement member, 12 ... 2nd reinforcement member, 13 ... Crossing part, 14 ... single cell, 24 ... harness (cable).

Claims (1)

A skeleton member extending in the front-rear direction of the vehicle is provided on the left and right sides of the vehicle, and a battery pack having a laminated body in which a plurality of single cells are laminated in one direction 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,
A first reinforcing member extending in the front-rear direction of the vehicle and a second reinforcing member extending in the vehicle width direction of the vehicle are provided inside the battery pack, and
The first reinforcing member and the second reinforcing member are crossed with each other, and the first reinforcing member and the second reinforcing member are crossed at the crossing portion of the first reinforcing member and the second reinforcing member. Are joined together,
A cable electrically connected to the laminate is disposed inside the first reinforcing member,
The single cell has a solid electrolyte sandwiched between a pair of electrodes,
The battery mounting structure for a vehicle, wherein the stacked body is configured by pressing the plurality of unit cells in the stacking direction so as to be in close contact with each other.

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