JPH10149805A - Battery fixing structure for electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery fixing structure for an electric vehicle being resistant against vibration or a shock and being capable of preventing occurrence of short-circuiting, wherein the number of holder members for fixing batteries can be reduced so that the number of component items can be reduced and operability can be enhanced. SOLUTION: In the case a plurality of batteries 2 are arrayed, holder members 10a-10c are stretched across the end edges of the batteries 2 along the arraying direction in which the number of batteries 2 is greater. In this state, the plurality of batteries 2 are tightly fixed between the holder members 10a-10c and the bottom face 1a of a battery containing tray. In the case the batteries 2a, 2b and the battery 2c are shifted in position from each other along the vehicle lengthwise direction or the vehicle lateral direction, a connecting bracket 19 is laid to overlap one end of each of holder members 17b, 18a, 18c stretched across the end edges of the batteries 2a-2c, followed by tightening together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery storage tray mounted on a vehicle body of an electric vehicle, in which a plurality of batteries are arranged in a vehicle longitudinal direction and a vehicle lateral direction. The present invention relates to a structure for fixing individual batteries to the battery storage tray.

[0002]

2. Description of the Related Art FIGS. 8 to 12 illustrate a conventional battery fixing structure for an electric vehicle.
8 and 9 show the bottom surface 1a of the battery storage tray 1.
(See FIG. 9) _First- stage battery group S ₁ arranged above
Shows the structure for fixing the, Figure 12 shows a structure for fixing a battery group S ₂ of the second stage which is disposed on the battery group S ₁ of the first stage.

[0003] As shown in FIGS. 8 and 9, the battery group S ₁ of the first stage is approximately rectangular parallelepiped shape of a plurality (e.g., eight) the battery 2 is the longitudinal direction of the vehicle body α and the lateral direction of the vehicle body beta (vertical and horizontal (In both directions), two rows are arranged in the vehicle body front-rear direction α and four rows are arranged in the vehicle body left-right direction β. In FIG. 8, reference numerals 3a and 3b denote a pair of electrodes provided on the upper surface of each battery 2.

Each of the batteries 2 constituting the first-stage battery group S ₁ has a longitudinal holder member 4 a, 4 b, 4 c,
By using 4d, 4e and a plurality of stud bolts 5, it is fixed on the bottom surface 1a of the battery storage tray 1. More specifically, each of the holder members 4a, 4b, 4c, 4d, and 4e extends along the arrangement direction in which the number of batteries 2 is smaller among the two arrangement directions described above, that is, along the vehicle front-rear direction α in FIG. The battery 2 is arranged corresponding to both edge portions. As shown in FIG. 10, the left and right holder members 4a and 4e are made of a steel angle member having an L-shaped cross section and having a stud bolt insertion hole 5a. It is arranged corresponding to the side edge portion. Further, the holder members 4b, 4c and 4d
Is made of a T-shaped iron angle member having a stud bolt insertion hole 5b as shown in FIG.
It is bridged between the batteries 2 arranged adjacent to each other at an intermediate position in the right and left arrangement directions, and is arranged corresponding to the edge of the battery 2. Thus, the stud bolts 5 are interposed between the holder members 4a to 4e applied to the both edge portions of each battery 2 and the bottom surface 1a of the battery storage tray 1, and fastened to the upper end of the stud bolts 5. By screwing the attached nut 6 and tightening it,
Each battery 2 is fixed in a sandwiched state between the holder members 4 a to 4 e and the bottom surface 1 a of the battery storage tray 1. In FIG. 11, reference numeral 7 denotes a plurality of welding nuts which are stud bolted and screwed to the bottom surface 1a of the battery storage tray 1 by welding.

Further, in the battery group S ₂ of the second stage, as shown in FIG. 12, the front side of the vehicle body, for example, two batteries 2 are elongated in parallel arranged, these two batteries 2 In the rear part, there is a displacement in the vehicle body left-right direction β in parallel with the vehicle body front-rear direction α and in the middle of the two batteries 2 in the left-right arrangement direction, that is, relative to the two front batteries 2. For example, one battery 2 is disposed at the position. And
To fix these batteries 2, holder members 9 a, 9 b, 9 c, 9 d, 9 e, and 9 f made of an iron angle material having an L-shaped cross section are arranged correspondingly on both right and left side edges, respectively. Similarly, these holder members 9a
The stud bolt 5 is interposed between the both end portions of ~9f and the bottom surface 1a of the battery accommodating tray 1, wherein each battery 2 of the battery group S ₂ of the second stage by tightening the nut to these stud bolts are to be fixed to each battery 2 of the battery group S ₁ of the first stage in a sandwich state between the holder member 9a to 9f.

[0006]

However, in the conventional battery fixing structure as described above, a number of holder members 4a to 4e and 9a to 9f are used to fix a plurality of batteries 2 in the battery storage tray 1. Required and the number of parts becomes very large. Therefore, the workability in fixing the battery is poor,
There is a problem that costs are high. In addition, the holder member 4a
-4e and 9a-9f are made of iron and steel, and are disposed near the electrodes 3a, 3b of the battery 2, so that the holder members 4a-4e, 9a-9f unexpectedly
a and 3b may be short-circuited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to reduce the number of holders used for fixing a battery, thereby reducing the number of parts and work. It is an object of the present invention to provide a battery fixing structure for an electric vehicle having a structure capable of improving the performance, being resistant to vibration and impact, and preventing occurrence of a short circuit.

[0008]

In order to achieve the above-mentioned object, according to the present invention, a plurality of batteries are provided in a battery storage tray mounted on a vehicle body of an electric vehicle along a vehicle longitudinal direction and a vehicle lateral direction. In the structure in which the plurality of batteries are aligned and fixed to the battery storage tray in this arrangement state, the arrangement in which the number of the batteries is larger in the arrangement direction in the vehicle body front-rear direction and the vehicle body left-right direction is larger. On the edge along the direction, the holder members extending longitudinally along the arrangement direction are respectively spanned, and stud bolts are respectively interposed between these holder members and the bottom surface of the battery storage tray. A plurality of batteries are fastened and fixed between the holder member and the bottom surface of the battery storage tray.

Further, in the present invention, the holder member is made of a fiber reinforced resin.

According to the present invention, a plurality of batteries are arranged in a battery storage tray attached to a vehicle body of an electric vehicle in parallel with each other in the vehicle longitudinal direction and the vehicle lateral direction. The batteries arranged adjacently along one of the left and right directions and the batteries arranged adjacently along the other direction are arranged with a relative displacement, and the plurality of batteries are arranged under this arrangement state. In the structure in which the plurality of batteries are fixed to the battery storage tray, holder members are respectively laid over both end edges of the plurality of batteries arranged along an orthogonal direction orthogonal to the direction of the positional shift, A connection bracket is provided in an area between the batteries adjacent in the orthogonal direction and extending in the direction of the displacement. The connecting bracket is overlapped on one end of each of the plurality of holder members, and the overlapped portions of these overlapped portions except for two places at both ends are jointly fastened and fixed. Under the condition, stud bolts are respectively interposed between the two overlapping portions on both end sides and the bottom surface of the battery storage tray, and the plurality of batteries are connected to the holder member and the bottom surface of the battery storage tray. Between them.

In the present invention, the holder member and the connecting bracket are made of fiber reinforced resin.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Note that in FIGS. 1 to 7, parts common to FIGS. 8 to 12 are denoted by the same reference numerals.

FIG. 1 shows an arrangement state (mounted state) of a plurality of batteries 2 which are driving power supplies for an electric vehicle. These batteries 2 are stored and arranged in a predetermined arrangement inside a battery storage tray 1 (not shown in FIG. 1) attached to a lower portion of a floor panel of an electric vehicle, and under the arrangement state, as described later. It is configured to be fixed in the battery storage tray 1.

In this example, the battery arrangement is a two-stage stack.
The first stage battery group S ₁Make up multiple
The battery 2 extends along the vehicle longitudinal direction α and the vehicle lateral direction β.
In parallel with each other, and
Lee group S_TwoThe plurality of batteries 2 constituting the
Battery 2a adjacently arranged along direction β and the other side
Between the battery 2b adjacently arranged along the direction of
They are arranged with a relative displacement. Note that the above
Second stage battery group S_TwoIs an electric car floor panel
In the tunnel formed in the
I have.

Here, a structure for fixing the battery 2 to the battery storage tray 1 (see FIG. 3) will be described as follows. First, the first-stage battery group S ₁
2 (unit block location) in FIG.
As shown in FIG. 2, two rows of batteries 2 are arranged in the vehicle longitudinal direction α, and four rows of batteries 2 are arranged in the vehicle lateral direction β. Holder members 10a, 10b extending longitudinally along the arrangement direction at the edge portions A, B, C, D of the portion along the arrangement direction with the larger number of batteries (in this example, the vehicle lateral direction β). , 10c. Then, as shown in FIGS. 2 and 3, one stud bolt 11 a, 11 b, 11 c is interposed between the holder members 10 a, 10 b, 10 c and the bottom surface 1 a of the battery storage tray 1. A plurality of batteries 2 constituting the eye battery group S ₁ are fixed between the holder members 10 a, 10 b, 10 c and the bottom surface 1 a of the battery storage tray 1. In this example, the stud bolts 11a,
11b and 11c are respectively arranged at two positions in the longitudinal intermediate portion of each of the holder members 10a to 10c, and a total of six stud bolts 11a, 11b and 11c are used for fixing the battery (FIG. 2). reference). In addition,
Both ends of each of the holder members 10a to 10c are not tightened and fixed.

More specifically, two holder members 10 are disposed at both ends in the longitudinal direction α of the vehicle body.
As shown in FIG. 3, a and 10c are formed by angle members having a L-shaped cross section (similar to those shown in FIG. 10), and one of the holder members 10a and 10c is connected to one edge 12b of the battery 2. The other part 1 of the holder members 10a, 10c is arranged corresponding to the upper surfaces of the parts A, D, respectively.
3a and 13c are arranged corresponding to the side surfaces of the edge portions A and D.
Thus, the stud bolts 11a and 11a are attached to the welding nut 7 welded to the bottom surface 1a of the battery storage tray 1.
c and screw these stud bolts 1
1a, 11c is replaced with one part 12 of holder members 10a, 10c.
a, 12c and the bottom surface 1a of the battery storage tray 1, and in this state, the pieces 12a, 12c
The battery 2 is tightened and fixed between the holder members 10a and 10c and the bottom surface 1a of the battery storage tray 1 by tightening the tightening nut 6 from the side c.

Further, as shown in FIGS. 3 and 4, a holder member 10b disposed at an intermediate portion in the vehicle longitudinal direction α has a flat substrate portion 14b having a stud bolt insertion hole 14a, and a flat substrate portion 14b having a stud bolt insertion hole 14a. It is a steel member comprising bent pieces 14c and 14d bent upward at both ends of 14b. Thus, the flat substrate portion 14b of the holder member 10b is positioned between the batteries 2 adjacent to each other in the vehicle front-rear direction α.
Are applied to edges B and C of the upper surface of
The battery 2 is fastened and fixed between the holder member 10b and the bottom surface 1a of the battery storage tray 1 by fastening the fastening nut 6 to the stud bolt 11b.

Since the above-mentioned holder members 10a to 10b are made of steel (conductive material), there is a danger of a short circuit. Therefore, in the present example, the holder members 10a to 10a
b has an insulating coating on the entire surface.

Conventionally, as shown in FIG.
4e, the battery was fixed at 15 points. According to such a battery fixing structure, the battery can be fixed at 6 points (see FIG. 2), and the number of parts, that is, the holder member,
The required number of stud bolts and nuts can be reduced, and the number of working steps can be reduced. In other words, a large number of batteries 2 can be fixed in the battery storage tray 1 with a small number of holder members or the like. Therefore, parts costs and work costs can be reduced.

Further, in the above-described embodiment, the holder members 10a to 10c made of steel are used, but a holder member made of FRP (made of fiber reinforced resin) can be used. In this case, as shown in FIG.
5. A holder member 10 having a T-shaped cross section, which is formed by bonding an elongated flat plate 16 having a width smaller than the central portion to the lower surface of the lower plate 5 with an adhesive.
b and a holder member 10 formed by molding into an L-shaped cross section
a, 10c may be used. According to such an embodiment, since the holder members 10a to 10c are insulative, the holder members 1a to 1c need not be coated with an insulating coating.
Occurrence of a short circuit through 0a to 10c can be avoided.

On the other hand, the second-stage battery group S ₂ disposed in the tunnel section of the floor panel is composed of three batteries 2a, 2b, 2c as shown in FIG. Two batteries 2a, 2b are arranged in front of the vehicle body along the vehicle body left-right direction β in parallel with each other, and at the rear of the batteries 2a, 2b in the front row in a state parallel to them. One battery 2c which is adjacent and has a relative displacement with respect to these front row batteries 2a and 2b along the vehicle body left-right direction β.
Is arranged. That is, one battery 2c that is arranged with a displacement is arranged at a central position between the two batteries 2a and 2b in the front row.

[0022] The three battery 2a constituting the battery group S ₂ of the second stage, 2b, 2c is adapted to be secured in the following manner. First, the two batteries 2a and 2b in front are arranged along both end edges, that is, in a direction orthogonal to the direction of displacement (in this example, the vehicle lateral direction β) (in this example, the vehicle longitudinal direction α). The holder members 17a, 17b, and 17c are respectively laid over both edge portions E, F, G, and H of the two batteries 2a, 2b, and the holder member 18a is provided on both edge edges of the rear battery 2c. , 18b. In addition,
The holder members 17a, 17c and 18a, 18b have a cross section L
The holder member 17b is a steel member provided with an insulation coating having a T-shaped cross-section formed by welding the above-mentioned angle members having an L-shaped cross-section to each other. (These members may be FRP members as in the case described above).

Further, it is a region between the batteries 2a, 2b and 2c adjacent in the orthogonal direction (vehicle longitudinal direction α) and the direction of the displacement (vehicle lateral direction β).
The connecting bracket 19 is disposed in a region extending along the longitudinal direction, and is superposed on the rear ends of the holder members 17a, 17b, 17c and the front ends of 18a, 18b. The connecting bracket 19 is a member made of a steel or FRP material, and as shown in FIG. 7, a flat substrate portion 19a and a flat substrate portion 19a.
bent pieces 19b, 1 integrally formed by bending at both ends of
9c. Then, an intermediate portion in the longitudinal direction of the connecting bracket 19, a rear end of the intermediate holder member 17b, and a holder member 18 having an L-shaped cross section.
a, 20b, 2 at the front ends of the a, 18b
7 is jointly fastened (fastened) by the bolt 21 and the welding nut 22 as shown in FIG.

Thus, each of the holder members 17a, 17b,
17c, 18a and 18b are attached by the same structure as the above-mentioned fixing structure using the stud bolt 5, the tightening nut 6 and the welding nut 7, but both ends of the connecting bracket 19 and a pair of right and left are provided. Holder members 17a, 17
The overlapping portions 23a and 23b with the rear end portion c are fixed to the bottom surface 1a of the battery storage tray 1 while being overlapped.

According to such a battery fixing structure,
A connecting bracket 19 is attached, and three overlapping portions 20a, 20b, 20c of the connecting bracket 19 and the holder members 17b, 18a, 18b are fastened together, and under this state, both ends of the connecting bracket 19 The holder member 1
Bottom 1 of battery storage tray 1 together with 7a and 17c
Since the battery is fastened and fixed in the state of being superposed on the battery a, each battery can be firmly fixed by the reinforcing effect of the connecting bracket 19. Further, as the holder member 17b, a member having two T-shaped cross sections formed by welding and joining two angle members having an L-shaped cross section for the holder members 17a and 17c may be used. Since the member is used as one part, the number of parts can be reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes can be made based on the technical concept of the present invention. For example, the number of batteries arranged in the battery storage tray 1 is not limited to the above-described embodiment, and can be variously changed as necessary. Further, in the above-described embodiment, the longitudinal direction of the rectangular parallelepiped battery 2 is set to the vehicle longitudinal direction α, but the present invention can be applied to a case where the battery 2 is arranged in the opposite direction.

[0027]

As described above, according to the present invention, when a plurality of batteries are arranged and aligned, the edge along the arrangement direction of the larger number of batteries among the arrangement directions of the vehicle front-rear direction and the vehicle body left-right direction. On the part, the holder members extending in the longitudinal direction along the arrangement direction are respectively spanned, and stud bolts are interposed between these holder members and the bottom surface of the battery storage tray, respectively, to thereby form the plurality of batteries. Since the fastening member is fixed between the holder member and the bottom surface of the battery storage tray, the number of holder members can be reduced, and the number of fastening locations by stud bolts and nuts can be reduced. can do. Accordingly, with the reduction in the number of parts and the number of fixed work steps, the workability can be improved, and the parts cost and the work cost can be reduced.

Further, in the present invention, when a plurality of batteries are displaced in the longitudinal direction of the vehicle body or in the lateral direction of the vehicle body, the plurality of batteries are arranged along an orthogonal direction orthogonal to the direction of the displacement. The holder members are respectively bridged over both edges of the two batteries, and the connecting bracket is disposed in a region between the batteries adjacent in the orthogonal direction and a region extending along the direction of the displacement. A connecting bracket is superimposed on one end of each of the plurality of holder members, and stud bolts are interposed between these superimposed portions and the bottom surface of the battery storage tray, respectively. Since the bracket is fastened and fixed between the holder member and the bottom surface of the battery storage tray, the connection bracket is By being fastened to the timber, the rigidity of the holder member is increased in the tightened position, it can be further enhanced hold effect of the plurality of battery according hence the holder member and the connecting bracket,
A plurality of batteries can be securely fixed and held. Therefore, a fixing structure resistant to vibration and impact can be obtained due to the presence of the connecting bracket.

Further, according to the present invention, since the above-mentioned holder member and the connecting bracket are made of fiber reinforced resin (FRP), these members can be provided with a good electric insulating property without applying an insulating coating. Therefore, even if the holder member or the connecting bracket is accidentally pushed and comes into contact with the electrode of the battery, it is possible to avoid an undesirable phenomenon such as a short circuit. Moreover, there is an advantage that the holder member and the connecting bracket made of fiber reinforced resin can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an arrangement state (mounted state) of a plurality of batteries mounted in a battery storage tray.

FIG. 2, showing the first embodiment of the present invention, is a plan view showing a fixing structure of a battery constituting a first-stage battery group.

FIG. 3 is a side view showing a fixing structure of a battery constituting the first-stage battery group.

FIG. 4 is a perspective view of a holder member for fixing a battery.

FIG. 5 is a perspective view of a holder member made of FRP and having a T-shaped cross section.

FIG. 6, showing the second embodiment of the present invention, is a plan view showing a fixing structure of a battery constituting a second-stage battery group.

FIG. 7 is a side view showing a fixing structure of a battery constituting the second-stage battery group.

FIG. 8 is a plan view similar to FIG. 1, showing a conventional battery fixing structure for an electric vehicle.

FIG. 9 is a side view of the battery fixing structure of the conventional electric vehicle shown in FIG.

FIG. 10 is a perspective view of a holder member having an L-shaped cross section.

FIG. 11 is a perspective view of a holder member having a T-shaped cross section.

FIG. 12 is a plan view similar to FIG. 6, showing a conventional battery fixing structure for an electric vehicle.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Battery storage tray 2 Battery 2a, 2b, 2c Battery constituting the second-stage battery group 5 Stud bolt 6 Tightening nut 7 Welding nut 10a, 10b, 10c Holder member 11a, 11b, 11c Stud bolt 17a, 17b, 17c Holder member 18a, 18b Holder member 19 Connection bracket 21 Bolt 22 Weld nut A-J Edge of battery α Body longitudinal direction β Body lateral direction (vehicle width direction)

Claims (4)

[Claims] 1. A plurality of batteries are arranged in a battery storage tray attached to a vehicle body of an electric vehicle along a vehicle front-rear direction and a vehicle body left-right direction. In the structure in which the battery is fixed to the battery storage tray, a longitudinal shape is formed along the arrangement direction on the edge portion along the arrangement direction of the larger number of the batteries in the arrangement direction in the vehicle body front-rear direction and the vehicle body left-right direction. And a plurality of batteries are interposed between the holder members and the bottom surface of the battery storage tray by interposing stud bolts between the holder members and the bottom surface of the battery storage tray. A battery fixing structure for an electric vehicle, wherein the battery fixing structure is fastened and fixed therebetween. 2. The battery fixing structure for an electric vehicle according to claim 1, wherein said holder member is made of a fiber reinforced resin. 3. A battery storage tray mounted on a vehicle body of an electric vehicle, wherein a plurality of batteries are arranged in parallel with each other along the vehicle body front-rear direction and the vehicle body left-right direction. The batteries arranged adjacently along one direction and the batteries arranged adjacently along the other direction are arranged with relative displacement, and the plurality of batteries are arranged under this arrangement state. In the structure for fixing to the battery storage tray, a holder member is laid over both end edges of the plurality of batteries arranged along an orthogonal direction orthogonal to the direction of the displacement, and in the orthogonal direction. A connecting bracket is arranged in an area between adjacent batteries and extending along the direction of the misalignment. The connecting bracket is superimposed on one end of each of the plurality of holder members, and the superimposed portions of these superimposed portions except for two places at both ends are fastened and fixed together. Stud bolts are interposed between two overlapping portions on both ends and the bottom surface of the battery storage tray, and the plurality of batteries are tightened between the holder member and the bottom surface of the battery storage tray. A battery fixing structure for an electric vehicle, wherein the battery fixing structure is fixed. 4. The battery fixing structure for an electric vehicle according to claim 3, wherein the holder member and the connection bracket are made of fiber reinforced resin.