JP2017193291A - Battery mounting structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery mounting structure of a vehicle which achieves excellent protection performance of an electronic control unit for controlling charging/discharging and excellent vehicle mountability or sufficiently secures the power capacity.SOLUTION: A housing part 35 is formed between a floor cross 18 disposed between battery modules 15 and a reinforcement part 34 which is disposed so as to face the floor cross 18 in a vertical direction and reinforces a bottom plate 27 of a case, and an electronic control unit 36 is disposed in the housing part 35. A width W36 of the electronic control unit 36 is narrower than one of a width W18 of the floor cross 18 and a width W34 of the reinforcement part 34. Thus, the electronic control unit 36 is protected in both a vehicle fore and aft direction and a vehicle width direction by the floor cross 18 and the reinforcement part 34. Further, a space between the battery modules 15 is effectively utilized.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 described in Patent Document 1, a first battery unit 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. The second battery unit is provided with a control unit for controlling devices in the junction box, and the control unit is an end plate for binding a plurality of batteries stacked in the vehicle transverse direction. Is disposed between the end plate and the case of the battery unit. In other words, the control unit is arranged side by side in the same direction as the plurality of batteries.

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 is applied to the second battery unit in the stacking direction with the deformation of the skeleton member. Since the control units are stacked or arranged in the same manner as a plurality of batteries, when a large load is generated due to a side collision or the like, a large load acts on the control unit via the battery. Since the control unit is less rigid than the battery or the battery unit, when a large load is applied due to a side collision, there is a possibility that deformation or damage resulting from the deformation occurs.

  In order to eliminate such an inconvenience, it is possible to additionally install a reinforcing member for protecting the control unit. However, when such a reinforcing member is provided, the number of manufacturing steps and the weight of the vehicle body increase due to an increase in the number of parts. In addition, since a space for installing the reinforcing member is required, the battery unit becomes large, the in-vehicle property of the battery unit is deteriorated, or the battery capacity is limited.

  The present invention has been made in view of the above-described circumstances, and has a battery mounting structure for a vehicle that is excellent in the protection performance of an electronic control unit that controls charging and discharging, is excellent in in-vehicle performance, or can sufficiently secure power capacity. It is intended to provide.

  In order to achieve the above object, the present invention provides a vehicle battery mounting structure in which a battery pack in which a plurality of battery modules are housed in a case is disposed along a vehicle floor panel. A skeleton member is provided on each of both sides, and is a ridge that protrudes from the floor panel and reinforces the floor panel, and a floor cloth having a predetermined width when viewed in the front-rear direction of the vehicle is a vehicle width of the vehicle Extending in a direction and connected to the skeleton member, the battery modules are arranged parallel to each other along the floor cloth, and the case is located inside the case at a position where the battery modules are spaced apart from each other. A concave groove extending in the vehicle width direction, and facing the concave groove on the inner surface of the case, toward the inside of the case And a reinforcing portion having a predetermined width, which is a ridge portion extending in the vehicle width direction, is formed between the concave groove portion and the reinforcing portion, and charging / discharging of the battery module is performed. The electronic control unit to be controlled is disposed inside the housing portion, and the width of the electronic control unit is narrower than one of the width of the floor cloth and the width of the reinforcing portion. .

  According to the present invention, the load acting in the width direction of the vehicle due to a side collision or the like is supported by the floor cross and the reinforcing portion and is applied to the battery module, and therefore, avoiding or suppressing the application of a large load to the electronic control unit. can do. In addition, since the width of the electronic control unit is narrower than the width of the floor cross or the reinforcing portion, when a large load acts in the front-rear direction of the vehicle and the deformation occurs, the load caused by the deformation first has a width wider than that of the electronic control unit. It is handled by a large floor cloth or a reinforcing portion, and therefore, it is avoided or suppressed that a large load acts on the electronic control unit. In this way, the electronic control unit is protected by the member that reinforces the vehicle body, the floor, or the battery pack, so that the structure of the vehicle body floor side or the structure of the battery pack can be reduced without increasing the size or complexity of the battery pack. The protection performance from external load can be improved. Moreover, the vehicle-mounted property of the battery pack can be improved. Furthermore, since the space restriction for the battery module is reduced, a sufficient power capacity can be secured.

It is a figure which shows an example of the vehicle in the Example of this invention. It is a perspective view which omits and shows one of the battery modules. 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 sectional drawing which follows the VV line of FIG.

  Embodiments will be described below with reference to the drawings. FIG. 1 is a bottom view showing an example of a lower structure of a vehicle 10 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 10 includes a traveling device 12 and a traveling controller 13 mounted in, for example, a front compartment 11. The traveling device 12 is a device that outputs a driving force for the vehicle 10 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 13 is a controller that controls the fuel injection amount, ignition timing, throttle opening, etc. of the engine, control equipment such as an inverter and converter that controls the motor current and rotation speed, and control signals to the control equipment. Is provided.

  A battery pack 14 serving as a power source for traveling is mounted on the lower portion of the vehicle 10. The battery pack 14 may be disposed on either the upper surface side or the lower surface side of the floor panel. In the following description, an example provided on the lower surface side of the floor panel will be described. The battery pack 14 is formed by stacking a plurality of single cells to form a battery module 15, storing a plurality (10 in the example of FIG. 1) of battery modules 15 in a rectangular parallelepiped case 16, and connecting the battery modules 15 in series. Or it is comprised so that electric power can be taken out outside while connecting suitably in parallel. In the example shown in FIG. 1, the ten battery modules 15 are arranged in parallel with each other at predetermined intervals in the vehicle width direction and the front-rear direction, and in a matrix form of five rows in the front-rear direction and two columns in the width direction. It is arranged.

  The vehicle 10 includes a pair of side sills (also referred to as rockers) 17 that extend in the front-rear direction of the vehicle 10 on both sides in the vehicle width direction. A floor panel (not shown in FIG. 1), which will be described later, is provided so as to cover the portion between the side sills 17. In addition, a pair of floor cross reinforcements (hereinafter simply referred to as floor crosses) 18 on both sides of the side sill 17 in the longitudinal direction (the front-rear direction of the vehicle 10) across the substantially central portion are spaced from each other at a predetermined interval. They are arranged in parallel. The floor cloth 18 is a reinforcing member (protruded portion) arranged in the vehicle width direction of the vehicle 10 and has an extrusion-molded or press-molded hat-shaped cross section (or cup-shaped cross section). It is attached to the lower surface of the floor panel so as to be in close contact with the floor panel, and both ends in the longitudinal direction are fixed to the side sill 17. The distance between the floor cloths 18 is slightly larger than the width of the battery module 15 described above in the front-rear direction of the vehicle 10. This is because the battery module 15 is disposed between the floor cloths 18.

  Here, the configuration of the battery module 15 will be described. FIG. 2 is a perspective view showing an example of the battery module 15. In FIG. 2, the arrow FR direction indicates the front direction in the vehicle longitudinal direction, the arrow LH direction indicates the left direction in the vehicle width direction, and the arrow UP direction indicates the upward direction in the vehicle vertical direction. As shown in FIG. 2, the battery module 15 includes a battery stack 20 in which a plurality of flat single cells 19 are stacked, a pair of end plates 21 disposed at both ends in the stacking direction of the battery stack 20, and a battery. The stack 20 is provided with a pair of tension plates 23 sandwiching the stack 20 from above and below and having both ends in the longitudinal direction connected to the end plates 21 by bolts 22 respectively. The single cell 19 is a so-called all-solid battery using a solid electrolyte, and is firmly adhered to the pair of end plates 21 by tightening bolts 22. In addition, the code | symbol 24 in FIG. 2 has shown the terminal.

  The structure of the battery pack 14 and the structure in which the battery pack 14 is attached to the vehicle body will be described. 3 is a sectional view taken along line III-III in FIG. 1, FIG. 4 is a sectional view taken along line IV-IV in FIG. 1, and FIG. 5 is a sectional view taken along line V-V in FIG. The floor panel 25 to which the floor cloth 18 is attached has both ends in the vehicle width direction fixed to the side sill 17 to constitute the floor surface of the passenger compartment. As shown in FIGS. 3 to 5, the floor cloth 18 is attached to the lower surface of the floor panel 25, and the floor cloth 18 serves as a ridge that reinforces the floor panel 25.

  On the other hand, the case 16 of the battery pack 14 has a rectangular parallelepiped shape including an upper lid 26 and a bottom plate 27, and the battery pack 14 is fixed so that the upper surface of the upper lid 26 faces the lower surface of the floor panel 25. The means for fixing can be selected as appropriate. For example, as shown in FIG. 5, a nut 28 fixed to the floor cloth 18 and a bolt 29 penetrated from the bottom plate 27 side of the battery pack 14 are used. The battery pack 14 can be fixed to the lower surface side of the floor panel 25. In addition, it is preferable that the inside of the battery pack 14 is sealed by inserting a cylindrical member (collar) into which the bolt 29 is inserted between the upper lid 26 and the bottom plate 27. As shown in FIG. 1, the locations where the battery pack 14 is fixed by the bolts 29 and the nuts 28 as described above are on both sides spaced apart from each other by a center portion in the longitudinal direction (vehicle width direction) of the floor cloth 18. It is provided in two places. Assuming that the portion between the two fixed locations 30 by the bolts 29 and nuts 28 is the center portion 31 and the outside (right side and left side of the vehicle 10) from the fixed location 30 is the side portion 32, these portions 31 and 32 are as follows. It is configured as follows. The means for fixing the battery pack 14 can be appropriately selected. For example, two fixing points similar to the fixing point 30 are provided, and a flange portion (not shown) is provided at the side end of the case 16. And the battery pack 14 may be fixed to the side sill 17 by the flange portion.

  As shown in FIG. 3, the portion of the upper lid 26 that faces the floor cloth 18 is recessed inside the battery pack 14 in accordance with the shape of the floor cloth 18, thereby forming a groove 33. The portion where the recessed groove portion 33 is formed is a portion between the battery modules 15 arranged with a space in the front-rear direction of the vehicle 10. Inside the side portion 32 is provided a side reinforcement (side RF) 34 corresponding to the reinforcing portion in the embodiment of the present invention. The side RF 34 is provided in a state where the fixed portion 30 made of the above-described collar or the like and the side portion (side surface portion) in the vehicle width direction of the battery pack 14 are connected. An intermediate portion of the side RF 34 in the longitudinal direction (vehicle width direction) is lowered to the bottom plate 27 side and is separated from the lower surface of the concave groove portion 33. Further, as shown in FIG. 3, this intermediate portion has a hat-shaped cross section or a cup-shaped cross section similar to the floor cloth 18 described above, and the bottom plate is in a closed state with the open end side in close contact with the inner surface of the bottom plate 27. 27 is fixed to the inner surface. Since the recessed groove portion 33 has a shape that follows the outer shape of the floor cloth 18, the lower surface on the inner side of the battery pack 14 is a flat surface, and the upper surface of the side RF 34 that faces this is similarly a flat surface. ing. The lower surface of the concave groove portion 33 and the upper surface of the side RF 34 that are opposed to each other are separated from each other, and a housing portion 35 is formed between the lower surface of the concave groove portion 33 and the upper surface of the side RF 34.

  An electronic control unit (ECU) 36 is disposed inside the housing portion 35. The ECU 36 is an electronic device having a configuration in which electronic components such as a microcomputer and an input / output interface are housed in a predetermined casing. As an example, the ECU 36 has a rectangular parallelepiped shape and its width (width measured in the front-rear direction of the vehicle 10) W36. The width W18 of the floor cloth 18 and the width W34 of the side RF 34 are narrower. This is because a load applied in the front-rear direction of the vehicle 10 due to a collision or the like is applied to the floor cloth 18 or the side RF 34 before the ECU 36. The width W18 of the floor cloth 18 or the width W34 of the side RF 34 is an interval between the end portions of the flange portions. The ECU 36 is fixed to the upper surface of the side RF 34.

  A center upper reinforcement (center upper RF) 37 is provided inside the center portion 31 in a state where the left and right fixing points 30 are connected. The center upper RF 37 is a reinforcing member for increasing the rigidity of the upper lid 26 in the battery pack 14. For example, the central portion in the longitudinal direction (vehicle width direction) forms a hat-shaped cross section or a cup-shaped cross section, and the opening end thereof is formed. It is fixed to the inner surface (lower surface) of the upper lid 26 in a state of being in close contact with the inner surface (lower surface) of the upper lid 26. That is, the center upper RF 37 serves as a protrusion on the lower surface of the upper lid 26 to increase the bending rigidity of the upper lid 26. Further, the center upper RF 37 is connected to the side RF 34 at the above-described fixing point 30, and the center upper RF 37 and the side RF 34 are combined to increase the rigidity of the battery pack 14 in the vehicle width direction.

  In addition, the center portion (center portion in the width direction of the vehicle 10) in the longitudinal direction (vehicle width direction) of the center upper RF 37 swells downward over a predetermined length, and the wire harness 38 is located at the center portion. The vehicle 10 penetrates in the front-rear direction. Therefore, the wire harness 38 is partially held by the center upper RF 37. In addition, the wire harness 38 is disposed so as to pass between the left and right battery modules 15 toward the front and rear direction of the vehicle at a central portion in the vehicle width direction, and the travel device 12 and the travel described above are connected to each battery module 15 and the ECU 36. The controller 13 is electrically connected. Accordingly, the wire harness 38 is disposed between the floor cloth 18 and the center upper RF 37 and the like, and these floor cloth 18 and the center upper RF 37 are so-called strength members for improving the rigidity. Is protected from a large external force generated during a collision.

  Further, the center portion of the bottom plate 27 in the vehicle width direction swells to the lower surface side so as to form a ridge 39 extending in the front-rear direction of the vehicle 10 as shown in FIGS. 4 and 5. A center lower reinforcement (center lower RF) 40 is provided on the inner side of the center portion 31 so as to cover the opening end of the ridge 39. The center lower RF 40 is a member for increasing the rigidity of the bottom plate 27 or the case 16 together with the above-described convex portion 39, and is formed in a hat-shaped cross section or a cup-shaped cross section, and its open end is brought into close contact with the inner surface of the bottom plate 27. In the state, it is fixed to the inner surface of the bottom plate 27.

  In the above-described battery mounting structure according to the embodiment of the present invention, the floor cloth 18 is provided to increase the rigidity of the floor panel 25, so that a predetermined interval is provided between the battery modules 15. Since the ECU 36 is disposed at a location where the interval is wide, it is not necessary to secure a special space for the ECU 36, and the space can be effectively used. Therefore, since the ECU 36 does not reduce the space for the battery module 15, the size of the battery pack 14 is not reduced, and the power capacity can be sufficiently increased. Further, the accommodating portion 35 in which the ECU 36 is disposed is formed by the floor cloth 18 and the side RF 34, and the width W36 of the ECU 36 is smaller than the width W18, W34 of one of the floor cloth 18 and the side RF 34. Even if a large load acts in the front-rear direction due to a collision or the like, a load is applied to the floor cloth 18 or the side RF 34 prior to the ECU 36, and the ECU 36 is protected from such a load.

  The present invention is not limited to the above-described embodiment, and the battery pack 14 may be disposed on the upper surface side of the floor panel 25. In that case, the structure shown in FIGS. It is sufficient to make the structure upside down. In addition, the number of battery modules in the present invention is not limited to the number shown in the above-described embodiments, and can be changed as appropriate. Further, the battery may be a storage battery other than the all solid state battery.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 14 ... Battery pack, 15 ... Battery module, 16 ... Case, 17 ... Side sill (rocker), 18 ... Floor cross reinforcement (floor cloth), 25 ... Floor panel, 26 ... Top cover, 27 ... Bottom plate, 33 ... concave groove, 34 ... side lean reinforcement (side RF), 35 ... housing part, 36 ... electronic control unit (ECU), W36 ... (electronic control unit) width, W18 ... (of floor cross reinforcement) Width, W34 ... (side lean reinforcement) width.

Claims (1)

In a vehicle battery mounting structure in which a battery pack in which a plurality of battery modules are housed in a case is arranged along a vehicle floor panel,
A skeleton member is provided on each of the both sides in the width direction of the vehicle,
A ridge that protrudes from the floor panel and reinforces the floor panel, and a floor cloth having a predetermined width as viewed in the front-rear direction of the vehicle extends in the vehicle width direction of the vehicle and is connected to the skeleton member. And
The battery modules are arranged parallel to each other along the floor cloth,
The case has a recessed groove portion that is recessed in the case and extends in the vehicle width direction at a location where the battery modules are spaced apart,
A reinforcing portion having a predetermined width that is convex toward the inner side of the case and extends toward the vehicle width direction is provided at a position facing the concave groove portion on the inner surface of the case,
An accommodating part is formed between the concave groove part and the reinforcing part,
An electronic control unit that controls charging / discharging of the battery module is disposed inside the housing portion, and the width of the electronic control unit is narrower than one of the width of the floor cloth and the width of the reinforcing portion. A vehicle battery mounting structure characterized by the above.

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