JPH07211303A - Battery fixation device of battery box - Google Patents

Abstract

PURPOSE:To accurately, surely and firmly fix each battery by without lashback in the vertical direction. CONSTITUTION:A plurality of batteries B are juxtaposed for storage in a battery box in the direction of the width and in the direction of the length, and a pair of urging pieces 11, 12 with a detent structure are insertingly disposed in layers in the upper part of a bolt 5 in a plane-view X-shaped form The urging piece 11 on the upper side of the urging piece 12 is fastened by a nut 13 threadedly engaged with the bolt, and four pieces of batteries radially disposed about the bolt are respectively fixed by the respective urging parts 11d, 12d of the urging pieces. Thereby, the corner parts of each battery are respectively urged for fixation downwards by the two urging parts of the respective urging pieces, and the batteries can be fixed by urging with the error of the height of each battery absorbed by each urging part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery fixing device for fixing a battery group used as an energy source of an electric vehicle to a battery box.

[0002]

2. Description of the Related Art An electric vehicle equipped with a plurality of batteries and using the battery group as an energy source for the vehicle has been conventionally known, and the battery group is housed in a battery box and disposed under the floor of the vehicle. Has been done. As a fixing device for such a battery in a battery box, if a large number of batteries are individually tightened and fixed with individual bolts, nuts, stays, etc., the number of parts becomes extremely large, and the battery fixing work However, the amount of removal work during maintenance becomes extremely large, which makes the work troublesome and complicated, resulting in extremely poor workability. Therefore, conventional Japanese Utility Model Publication No. 50-52433 and Japanese Utility Model Publication No. 50-524 have been proposed.
Techniques such as Japanese Patent Laid-Open No. 34 and Japanese Patent Laid-Open No. 56-13665 are disclosed.

Japanese Utility Model Publication No. 50-52433, Japanese Utility Model Publication No. 5
In the technology of 0-52434, long bolts are planted on the bottom plate of the battery box, and the adjacent corners of the four batteries arranged around the bolts are screwed from above with a nut and pressed. The structure which fixes by doing is disclosed. On the other hand, the technique of Japanese Patent Laid-Open No. 56-13665 discloses a configuration in which a long bolt is planted on the bottom plate of a battery box and a battery is pressed by a nut via an elastic member, as described above.

[0004]

In the above-mentioned prior art, the corners of the four batteries radially arranged around the bolt are fixed by pressing one washer and one nut, respectively. Certainly not done. That is, even if the upper surfaces of the corners of adjacent batteries are pressed with common bolts, nuts, and washers, the height of each battery varies, so some batteries and pressing washers are Then, a minute gap is generated in the vertical direction, which causes a problem such as rattling of the battery in the vertical direction.

On the other hand, in the prior art, since the battery fixing bolts are erected directly from the bottom plate of the battery box, the bolts are long, and fixing the bolts to the battery box is troublesome, complicated, and the workability is poor. Is not preferable for manufacturing. In addition, since the bolt is long, it is difficult to weld the lower end surface of the bolt directly to the box bottom plate and attach it vertically and accurately, which is not preferable in terms of installation accuracy, etc. Furthermore, it also affects the battery fixing work. Not preferable. Furthermore, if the lower end surface of the bolt is directly welded to the bottom surface of the battery box, it cannot be said that it is sufficient in terms of mounting strength of the bolt, and if it is firmly welded, welding work such as welding to the lower end of the bolt is troublesome, It is complicated.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 56-13665, even though the battery is pressed by the elastic body, it is the pressing of the battery alone and a plurality of parts cannot be pressed at the same time. It is troublesome and complicated, and on the other hand, since the battery fixing bolt is also erected from the box bottom plate, it has the same inconvenience as the above.

The present invention has been made to solve the above problems. The object of the present invention is to shorten the length of a battery fixing bolt to improve workability of bolt mounting and accuracy of bolt mounting position. , The bolt mounting strength can be improved, and among the four batteries arranged radially in the center of the bolt, each battery with height error can be accurately and surely absorbed by the common bolt and nut. Another object of the present invention is to provide a battery fixing device for a battery box, which has a simple structure and can be firmly fixed without backlash.

[0008]

[Means for Solving the Problems] To solve the above problems, a bolt is provided on the bottom plate side of the battery box, and the nut side screwed to the bolt is used to secure the battery housed in the battery box. A battery fixing device for a battery box in which a center frame is passed inside a battery box, and bolts are fixedly mounted on the center frame. Further, the bolt was erected on the upper portion of the center frame, and the base portion of the bolt was welded to the inner peripheral wall of the center frame.

Also, a center frame is passed inside the battery box, a nut is fixedly mounted on the center frame, and a battery housed in the battery box is fixed by a bolt side screwed to the nut. Is.

Further, in a battery fixing device in which a bolt is provided on the bottom plate side of the battery box, and the battery housed in the battery box is fixed by the nut side screwed to the bolt, A plurality of batteries are stored in parallel in the width direction and the length direction, and a pair of pressing pieces having a rotation-stopping structure are vertically stacked on top of the bolts to be mounted in an X shape in plan view, and the pressing pieces are overlapped. Press the nut with the nut to view each of the four batteries arranged radially around the bolt in a plan view.
This is a battery fixing device for a battery box, in which each pressing portion of the letter-shaped pressing piece individually presses.

Further, a plurality of batteries are accommodated in parallel in the width direction and the length direction in the battery box, and the opposing end portions of a pair of pressing pieces having a detent structure are placed above and below the bolt. Mounted in an H-shape in plan view,
Each pressing piece is provided with a pressing portion on the left and right sides, and the overlapped portion of the pressing pieces is fastened with the nut screwed to the bolt, and each of the four batteries radially arranged around the bolt is This is a battery fixing device for a battery box in which the pressing portions on the left and right sides of the pressing piece having an H-shape in plan view are individually pressed.

In addition, a plurality of batteries are accommodated in parallel in the battery box in the width direction and the length direction, and the opposing ends of a pair of pressing pieces having a detent structure are placed above and below the bolt. Mounted in an H-shape in plan view,
The pair of pressing pieces have the same shape, and each has a pressing portion on the left and right sides, and a mountain-shaped portion protruding to the inside and the back side of each pressing portion. One of the pair of pressing pieces is turned upside down with respect to the other. Batteries arranged such that the overlapping portions of the pressing pieces are fastened from above with the nuts, and the upper surface of each of the four batteries is fixed by the leg portion of one pressing piece and the mountain portion of the other pressing piece. It is a battery fixing device for the box.

[0013]

According to the above means, since the bolts or nuts for fixing the battery are fixedly mounted on the center frame of the battery box, the length of the bolts is shortened, the mounting is easy, and the positional accuracy is easy and accurate. You can On the other hand, the four batteries radially arranged so as to surround the bolt include the battery shoulders of the pair of pressing pieces arranged in the X-shape or the H-shape arranged around the bolt, or , Even if there is an error in the height direction of each battery due to being pressed by the pressing parts corresponding to the vicinity of each,
Accurately, each battery does not rattle up and down,
Moreover, it is securely fixed in the battery box.

[0014]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 is an exploded perspective view of a battery box according to a first embodiment of the present invention, FIG. 2 is a plan view of a battery box in which a battery is stored, and FIG.
3 is an enlarged sectional view taken along line 3; FIG. 4 is a plan view showing a state where the battery is pressed by a pressing piece; FIG. 5 is an enlarged sectional view taken along line 5-5 of FIG. 4;
6 is an enlarged sectional view taken along line 6-6 of FIG. 4, FIG. 7 is an exploded perspective view of the pressing piece of the first embodiment, FIG. 8 is an exploded perspective view of the pressing piece of the second embodiment, and FIG. 9 is the pressing piece of FIG. 10 is a plan view showing a pressed state of the battery by FIG. 10, FIG. 10 is an enlarged sectional view taken along line 10-10 of FIG. 9, FIG. 11 is an exploded perspective view of a pressing piece of the third embodiment, and FIG. 12 is FIG.
1 is a plan view showing a battery pressing state by the pressing piece of FIG. 1, FIG. 13 is an enlarged sectional view taken along line 13-13 of FIG. 12, and FIG.
2 is a sectional view taken along line 14-14, and FIG. 15 is a sectional view of a modified embodiment of the embodiment shown in FIG.

FIG. 1 is an exploded perspective view of a battery box, which has a rectangular plan view and has a box outer plate 2 opened upward.
Are formed by press forming of a steel plate material, and the surrounding peripheral plates 2a ...
And a bottom plate 2b and the like. Reference numeral 3 denotes an inner frame divided into four parts, which is provided with a large number of window portions 3a for the purpose of weight reduction, and is integrated with the inside of the peripheral plates 2a of the outer plate 2 by welding.
Reference numeral 4 denotes a center frame, which has an inverted U-shape having a narrow cross section and a high height as shown in FIGS. 1 and 3, and left and right side plates 4a each have a window portion 4b for reducing the weight. At the lower end portion, mounting flanges 4c, 4c extending symmetrically to the left and right are bent and integrally formed, and the top portion 4d is curved in an inverted U shape and is continuous with the left and right side plates 4a, 4a.

The center frame 4 is mounted inside the box outer plate 2 to which the inner frame 3 is joined,
The center frame 4 is located at the center of the box outer plate 2 in the short width direction, and is fixed in the longitudinal direction, which is the longitudinal direction,
It is provided as shown in FIG. 2 so as to divide the inside of the outer plate 2 into right and left. The battery box 1 is configured as described above, and the hanger for mounting on the vehicle body, the mounting stay, the lid for covering the battery box, etc. are omitted in the figure.

As shown in the sectional view of FIG. 3, the center frame 4 has a mounting flange 4c at the lower ends of the side plates 4a, 4a.
The lower portion 4e provided with and the intermediate upper portion 4f are bulged to the left and right, the intermediate portion 4g having the window portion 4b and the upper portion 4h are formed to have a narrow width, and the upper portion 4h has the same narrow width as the intermediate portion 4g, The center frame 4 has a mounting flange 4c at the lower end,
It is welded to and integrated with the bottom portion 2b of the box outer plate 2 at 4c.

On the top portion 4d of the upper portion 4h of the center frame 4 as described above, the bolts 5 for fixing the battery B are vertically attached and fixed. A mounting hole 4i is formed in the top portion 4d, and a shaft-shaped bolt 5 having no head is inserted into the mounting hole 4i from above and the bolt 5 is inserted.
A positioning washer 5 is provided between the shaft portion 5a and the screw portion 5b.
c is fitted and fixed, and with this as a reference, the shaft portion 5a is attached from above from the mounting hole 4i to the upper portion 4h of the inner frame 4,
The shaft 5a is fitted so as to face the lower end of the shaft 5a in the upper part of the window 4b above the intermediate upper part 4f and the intermediate part 4g, and the screw part 5b on the washer 5c is vertically projected onto the top part 4d.

The bolt 5 has a shaft portion 5a in the lower half portion, and an intermediate upper portion 4f in which an upper portion 4h on the side of the center frame 4 is swollen.
The inner surfaces of the upper and lower portions are welded to be integrated with each other, and the screw portion 5b is fixed so as to project above the top portion 4d. Bolt 5 Shaft 5
Since the center frame 4 is a tall and narrow inverted U-shape, the periphery of the shaft 5a is spot-welded at a plurality of positions in the height direction. Different from welding in, the welding strength is extremely high.

In the embodiment, as shown in FIG. 2, the center frame 4 is used as a boundary, two on the left and right, and 12 on the front and back, for a total of 24.
Store the individual batteries B in the battery box 1,
The bolts 5 are provided so as to be spaced from each other by a predetermined pitch in the length direction of the center frame 4, that is, in the front-back direction of the battery box 1. Specifically, one bolt 5 surrounds the four batteries B in the periphery. Since they are fixed in common, six pieces are provided in the front-rear direction so as to be separated from each other.

The center frame 4 is joined to the bottom plate 2b of the box outer plate 2 by the mounting flanges 4c and 4c at the lower end, and the front and rear parts thereof are joined to the inner frames 3 in the front and rear parts of the peripheral plate 2a of the outer plate 2, and The bolt 5 is fitted from above onto the top of the center frame 4 that is firmly and highly rigidly joined in the battery box 1 and is erected, and the shaft portion 5a is welded to the inner peripheral wall of the upper portion of the center frame 4. So
The bolts 5 will be installed while ensuring sufficient rigidity.

The bolts 5 are in a state in which the short shaft portion 5a is planted on the center frame 4 standing on the bottom plate 2b of the battery box 1, so to speak, as is clear in the embodiment. 5 has an extremely short length, and unlike the conventional one in which a thin bolt is directly erected on the bottom plate 2b, the mounting strength is high because it is joined by the surface of the shaft portion, Further, since the elongated object is different from the upright object, it does not bend and the positioning accuracy is high. Furthermore, since the bolts 5 are attached to the center frame 4 before the center frame 4 is attached to the outer plate 2 of the battery box 1, the attachment of the bolts 5 is made much easier than in the conventional case.

FIG. 15 shows an embodiment in which the nut 6 is welded to the back surface of the top portion 4d of the center frame 4. The top portion 4d is flat, a hole 4j for screwing the nut 6 is provided in the top portion 4d, and the bolt 7 is attached from above. The battery B is fixed by screwing, and such a structure may be used. Since the binding member is provided on the top of the center frame 4, unlike the conventional case, the nut 6 may be used on the battery box 1 side. ,
It is possible to fix the battery B. In the present embodiment, the center frame 4 and other components are substantially the same as those described above, so that the same parts are designated by the same reference numerals and detailed description thereof is omitted, but it can be fully understood.

Next, a fixing and pressing mechanism which is a main part of the battery mounting apparatus according to the present invention will be described. 4 to 7 show a first embodiment of a battery fixing / pressing mechanism, which is a fixing / pressing mechanism (hereinafter referred to as a pressing mechanism) 10
Consists of two strip-shaped pressing pieces 11 and 12 of narrow width,
Each of them has a substantially inverted concave shape similar to each other. The upper pressing piece 11 is provided with leg portions 11c and 11c which are symmetrically bent and slanted downward at both ends of the horizontal portion 11b of the body 11a of the reverse concave type,
Flat and horizontal pressing portions 11d and 11d symmetrically bent and extended outward are provided at the lower end portions of the leg portions 11c and 11c.
Equipped with. An insertion hole 11e for inserting the bolt 5 is formed in the center of the horizontal portion 11b of the main body 11a of the pressing piece 11, and a concave seat portion 11f is formed around the insertion hole 11e.

Similarly to the above, the lower pressing piece 12 has leg portions 12c and 12c symmetrically bent and slanted downward at both ends of the horizontal portion 12b of the body 12a of the inverted concave type. The portions 12c and 12c are shorter than the leg portions 11c and 11c by the plate thickness, and the flat and horizontal pressing portion 12 that is symmetrically bent and extended outward at the lower end portion of each leg portion 12c and 12c.
The horizontal portion 12b is provided with an insertion hole 12e through which the bolt 5 is inserted, similarly to the above.
In the horizontal portion 12b of the lower pressing piece 12, a restriction piece 12f is formed with a gap corresponding to the width of the horizontal portion 11b of the upper pressing piece 11.
Are erected at the front and rear in the width direction of the portions near both ends of the horizontal portion (rotation preventing structure), and the restricting pieces 12f are bent and erected on both sides of the front and rear portions in the length direction of the horizontal portion 12b to be integrated. Form. In addition, an engaging groove 12g is provided below the center of the horizontal portion 12b.
And the engaging groove 12g forms the washer 5c of the bolt 5.
The lower pressing piece 12 is prevented from rotating by engaging with the side surface 5d (rotation preventing structure).

The above pressing pieces 11 and 12 are connected to the battery B
Of the battery box 1 containing the ... Is inserted into the bolts 5 protruding above the center frame 4 through the holes 12e and 11e, and the upper pressing piece 11 that is superposed on the lower pressing piece 12 is the horizontal portion 11b. The intermediate portion is overlapped with the horizontal portion 12b between the restriction pieces 12f, and the pressing pieces 11 and 12 are overlapped and arranged at a right angle, so that they are arranged in an X shape in plan view as shown in FIG. The pressing pieces 11 and 12 are set in a state of being displaced by 45 ° with respect to the center line of the center frame 4 in the front-rear direction (length direction), and the four batteries B are arranged radially around the bolt 5. ... and pressing portions 11d, 11 of the pressing pieces 11, 12 on the adjacent corners.
The d, 12d, and 12d come into contact with each other from above.

Thereafter, the holes 12e,
The nut 13 is attached to the threaded portion of the bolt 5 protruding through 11e.
Are screwed together and the horizontal portions 11b, 1 of the pressing pieces 11, 12 are screwed from above.
2b is tightened and pressed, so that the corners of the four batteries B arranged radially around the bolt 5 that face each other and that are adjacent to each other have corresponding pressing parts 11d, 11d, 12d. , 12d are pressed from above. Even if there is an error in the height of each battery B ... due to the pressing of the individual battery corners,
Even if each of the heights is absorbed and the four nuts 13 are commonly tightened, pressed and fixed with one nut 13, each of the batteries B can be accurately, surely, highly accurately and accurately attached to the battery box from above. It can be pressed and fixed to the bottom.

The pressing pieces 11 and 12 may be press-formed products of steel plates, and spring steel plates may be used to press and fix the batteries B while elastically applying pressure. in this way,
While using one bolt in common, it is possible to press and fix the four batteries B around the bolt 5 accurately, reliably, firmly and firmly, even if each has a height error. . Then, when the upper pressing piece 11 is brought into contact with the nut 13 by the nut 13 so as to rotate and tighten, the restriction piece 1 of the lower pressing piece 12
Since the main body 11a of the upper pressing piece 11 is regulated and constrained by 2f, both sides 11 and 12 are prevented from rotating, and by the regulating pieces 12f, the rotation preventing is performed while maintaining the X-shaped state. As a result, both pressing pieces 11 and 12 are tightened and fixed.

8 to 10 show a second embodiment of a battery fixing and pressing mechanism. A fixing and pressing mechanism (hereinafter referred to as a pressing mechanism) 20 is composed of two piece-like pressing pieces 21 and 22. , And each has a generally symmetrical shape and a similar shape. The upper pressing piece 21 has a substantially T-shape having a width in a plan view, and the front cross section has a substantially concave shape, and a forward protruding piece 21b is integrally formed at an intermediate portion of the horizontal portion 21a. Form a T-shape in plan view.

On the left and right of the horizontal portion 21a, the leg portions 21c, 2 are provided.
1c, horizontal pressing portions 21d, 21d, which are symmetrically bent outwardly, are respectively provided at the lower ends thereof, and strip-shaped restricting pieces 21f, 21 are provided at least at both ends of the protruding piece 21b.
f is bent and drooped, and in the embodiment, the legs 21c, 21c
The regulation piece is extended to the front end edge of the leg portion 21c to increase the rigidity of the leg portions 21c and 21c. A mounting hole 21e is formed in the tip portion of the above-mentioned protruding piece 21b, and the horizontal portion 21a, the leg portions 21c and 21c, and the pressing portions 21d and 21d form a substantially inverted concave shape in a front view.

The lower pressing piece 22 has a symmetrical shape similar to the upper pressing piece 21, and has a horizontal portion 22a and left and right leg portions 22.
c, 22c, pressing portions 22d, 22d, and the horizontal portion 22
A projecting piece 22b is provided so as to project rearward from the intermediate portion of a, and the projecting piece 22b is bent and drooped at both end edges.
2f is provided, and the width of the protruding piece 22b is equal to that of the upper pressing piece 21b.
It is formed to have a width narrower than that of the protruding piece 21b by the amount corresponding to the plate thickness, that is, set to a width that fits in the space between the restriction pieces 21f and 21f of the upper pressing piece 21 to prevent rotation. Has been made (non-rotating structure). Further, the width of the protruding piece 22b is
The size is set to engage with the side surface 5d of the washer 5c of the bolt 5 to prevent rotation (rotation prevention structure). When the washer 5c is displaced by 90 ° with respect to FIG. 8, the lower pressing piece 22 is also displaced by 90 ° for mounting. A mounting hole 22e corresponding to the mounting hole 21e is formed at the tip of the protruding piece 22b.

The above pressing pieces 21 and 22 are arranged vertically,
The above-mentioned bolt 5 with the respective mounting holes 21e, 22e being concentric
The upper protruding piece 21b to the lower protruding piece 22b.
And the lower protruding piece 22b and the restricting pieces 22f, 22f.
Is the lower surface of the upper protruding piece 21b, the left and right restricting pieces 21f, 2
The pressing pieces 21, 22 are fitted and engaged between 1f, and are assembled in an H-shape in a plan view. Therefore, both 2
Rotation of 1 and 22 will be restricted and integrated,
The pressing piece 2 has a non-rotating structure and is thus assembled.
Four pressing parts 21d, 21d, 22d, 22 of 1, 22
d is 4 arranged radially around the bolt 5.
The batteries B are made to face the corners of the batteries B, which are arranged adjacent to each other, and the nuts 13 are screwed into the bolts 5 and tightened, and the pressing pieces 21 and 22 are pressed from above.

Four pressing parts 21 of each pressing piece 21, 22
d, 21d, 22d and 22d are four batteries B ...
The adjacent corners and the corners facing each other will be pressurized. This state is shown in FIGS. 9 and 10, and as shown in FIG. 9, the pressing pieces 21 and 22 are assembled in an H shape in plan view,
Moreover, it is tightened and presses the corner portion of each battery B ... Even if there is an error in the height of each battery B ...
Absorb by pressing from above individually, accurately, surely,
Firmly attach each battery B ... to the common bolt 5 and nut 13
It can be pressed and fixed with. According to the second embodiment, since the side face 5d of the washer 5c of the bolt 5 is arranged in the same direction as or at a right angle to the extending direction of the center frame 4, the bolt 5 can be mounted more than the structure of the first embodiment. Easy to install.

11 to 14 are for fixing the battery,
A third embodiment of the pressing mechanism is shown, and the fixing and pressing mechanism (hereinafter referred to as the pressing mechanism) 30 includes two piece-like pressing pieces 31, 32.
And the same shape, and one of them is vertically inverted with respect to the other. The upper pressing piece 31 has a T-shape having a substantially wide width in a plan view, and both end portions of the horizontal portion 31a are continuously provided with mountain-shaped portions 31g protruding upward in a mountain-shaped manner. A leg portion 31c hangs obliquely downward from the end portion below the horizontal portion 31a, and an outward pressing portion 31d is bent and extended in the horizontal direction at the lower end edge of the leg portion 31c.

A protruding piece 3 extends forward from an intermediate portion of the horizontal portion 31a.
1b is extended, a mounting hole 31e of the bolt 5 is bored at the tip of the protruding piece 31b, and a narrow, piece-shaped restricting piece 31f is provided on the right side of the tip of the protruding piece 31b. ° bend,
An elongated hole-like engagement hole 3 corresponding to a restricting piece 32f described later is provided on the rear left side of the mounting hole 31e of the protruding piece 31b.
1 h is drilled.

As the lower pressing piece 32, the above-mentioned upper pressing piece 31 is used by turning it upside down. Therefore, the upper and lower pressing pieces 3
It is not necessary to separately manufacture 1 and 32, one type of pressing piece is manufactured, the same pressing piece 31 as above is prepared, and this is turned upside down and used. That is, each part 3 of the lower pressing piece 32
2a to 32h are turned upside down so that the back surface side is up, the mountain portion 32g hangs downward, the upper engaging hole 31h and the lower restricting piece 32f, and the upper restricting piece 31f and the lower engaging hole 32h. And will face up and down. In addition, the upper control piece 31
By hanging down and engaging with the side surface 5d of the washer 5c of the bolt 5 and with the side surface of the upper portion 4h of the center frame 4, the upper pressing piece 31 is prevented from rotating (rotation stopper). Construction).

For the sake of convenience, the lower pressing piece is set to 32, but it is the same as the upper pressing piece 31 and only the reference numerals are divided for distinguishing the upper and lower parts. Upper and lower pressing pieces 31, 32
Is inserted into the bolt 5 from above via the mounting holes 31e and 32e, and the upper restricting piece 31f is engaged with the lower engaging hole 32h.
, And the lower restricting piece 32f engages with the upper engaging hole 31h,
As a result, both detents are made (detent structure),
The pressing pieces 31 and 32 have an H-shape in plan view as shown in FIG. 12, and the nut 13 is screwed into the bolt 5 to form the pressing pieces 31 and 32.
The four batteries B arranged radially around the bolt 5 facing each other and facing the adjacent corners,
Press and fix each corner from above.

By the way, in the present invention, the upper pressing piece 31.
, The pressing portions 31d and 31d come into contact with the corners of the two batteries B from above, and the lower pressing piece 32 is used by being inverted. Therefore, the mountain-shaped portions 32g and 32g are used for the other two batteries B. The four batteries B are brought into contact with the corner portion from above, and two of the batteries B ... Are pressed and fixed from above by two pressing portions 31d and 31d and two mountain-shaped portions 32g and 32g. The pressing portions 31d and 31d and the mountain-shaped portions 32g and 32g are
Since the mountain-shaped portion is provided so as to project from the horizontal portions 31a and 32a, the mountain portion itself has an elastic action and elastically presses and fixes each battery B ... In FIG. 12, the pressed and fixed state is shown in a plan view.
In 3 and 14, each part is shown in cross section, so that it can be easily understood.

In each of the above embodiments, the center frame 4 divides the inside of the battery box 2 and is interposed between the batteries B adjacent to each other in the front, rear, left and right,
The configuration is not limited to the configuration arranged at the central position in the battery box 2.

[0040]

As is apparent from the above, according to the present invention,
On the bottom plate side of the battery box, in the battery fixing device that fixed the battery housed in the battery box with the nut side screwed to this bolt, pass the center frame inside the battery box, By fixing the bolts to this center frame, it is no longer necessary to erect the bolts from the bottom of the battery box, so the length of the bolts can be significantly shorter, and the bolts will not fall over when they are erected from the bottom. It is possible to install bolts with high precision without inclination or inclination. Also, since the bolts can be attached to the center frame in advance, the bolts can be attached together when the center frame is manufactured. When the center frame is attached to the battery box, the bolts are attached at the same time. Installation workability is significantly improved compared to the past.

Further, since the bolt is erected on the upper portion of the center frame and the base portion of the bolt is welded to the inner peripheral wall of the center frame, unlike the case where the lower end surface of the long bolt is joined to the bottom portion of the box, the mounting of the bolt is different. High strength is obtained, and the bolt can sufficiently and firmly press the battery in response to tightening and pressing force of the battery.

Further, according to the present invention, the center frame is passed inside the battery box, the nut is fixed to the center frame, and the battery housed in the battery box is fixed by the bolt side screwed to the nut. , Since the screw part is not exposed from the top of the center frame, it does not hit and damage the screw part when storing the battery in the battery box.

Further, the present invention provides a battery fixing device in which a bolt is erected on the bottom plate side of the battery box and the nut side screwed to the bolt fixes the battery housed in the battery box. Inside, a plurality of batteries are accommodated in parallel in the width direction and the length direction, and a pair of pressing pieces having a rotation-stopping structure are vertically stacked on the upper part of the bolt and attached in an X-shape in plan view. By pressing the overlapped parts with a nut and pressing each of the four batteries arranged radially around the bolt individually with each pressing part of the X-shaped pressing piece in plan view, one battery is obtained. The corners of the two batteries can be individually pressed from above by the pressing parts on both sides of the pressing piece, and the four batteries can be individually pressed and fixed by the total of four pressing parts. Therefore, even if there is an error in the height of each battery, the error can be absorbed and pressed by each pressing part and fixed, and the vertical part of the fixing part caused by the error in the height direction of the battery is small. It is possible to press each battery to the bottom of the battery box accurately, surely, and firmly, without any unevenness. Further, since it is provided with the rotation preventing structure, it is assembled in an X-shape in plan view and easily positioned, and screwing work with a nut can be performed, which is extremely advantageous in terms of work. Furthermore, only one set of bolts and nuts is required to press and fix the four batteries individually, and the number of parts can be reduced. Furthermore, the pressing piece can be easily obtained as a press-molded product, which is extremely advantageous in terms of cost.

Further, according to the present invention, a pair of pressing pieces having a detent structure are mounted on the upper part of the bolt so as to overlap each other in an H-shape in plan view, and the pressing portions are arranged on the left and right sides of each pressing piece. The upper part of the pressing piece is fastened with a nut screwed to the bolt, and the four batteries radially arranged around the bolt are connected to the left and right of the pressing piece in the plan view. By individually pressing each of the pressing parts, the batteries adjacent to each other can be individually pressed by the pressing parts on the left and right of each pressing piece, so that there is an error in the height of each battery. Also, there is an effect that it can be surely pressed, and that the same effects as those of the above-mentioned X-shaped plan view structure can be obtained accurately, reliably and easily.

Further, according to the present invention, a pair of pressing pieces having a detent structure are mounted on the upper part of the bolt in an H-shape in a plan view by stacking opposing ends of the pressing pieces on top of each other. Yes, each has left and right pressing parts, each has a mountain-shaped part that projects to the inside and the back side, and one of the pair of pressing pieces is arranged upside down with respect to the other. By tightening the nuts from above and fixing the upper surface of each of the four batteries with the leg portion of one pressing piece and the mountain portion of the other pressing piece, one pressing piece is sufficient, Since it is possible to reduce the number of types, the cost can be reduced, and the same effects as those of the above-mentioned H-shaped configuration in plan view can be obtained accurately, reliably, and easily.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a battery box according to a first embodiment of the present invention.

FIG. 2 is a plan view of the battery box in which the battery according to the first embodiment of the present invention is stored.

FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG.

FIG. 4 is a plan view showing a state where the battery of the first embodiment according to the present invention is pressed by a pressing piece.

5 is an enlarged sectional view taken along line 5-5 of FIG.

6 is an enlarged sectional view taken along line 6-6 of FIG.

FIG. 7 is an exploded perspective view of the pressing piece according to the first embodiment of the present invention.

FIG. 8 is an exploded perspective view of a pressing piece according to a second embodiment of the present invention.

9 is a plan view showing a battery pressing state by the pressing piece of FIG.

10 is an enlarged sectional view taken along line 10-10 of FIG.

FIG. 11 is an exploded perspective view of a pressing piece according to a third embodiment of the present invention.

FIG. 12 is a plan view showing a battery pressing state by the pressing piece of FIG.

13 is an enlarged sectional view taken along line 13-13 of FIG.

14 is an enlarged cross-sectional view taken along line 14-14 of FIG.

15 is a cross-sectional view of a modified embodiment of the embodiment shown in FIG.

[Explanation of symbols]

1 ... Battery box, 4 ... Center frame, 4d
... top of center frame, 4h ... top of center frame, 5 ... bolt, 6 ... nut, 10 ... pressing mechanism, 1
1, 12 ... Pressing piece, 11d, 12d ... Pressing part, 12f ...
Regulation piece, 20 ... Pressing mechanism 21,22 ... Pressing piece, 21
d, 22d ... pressing portion, 21f, 22f ... regulating piece, 30 ...
Pressing mechanism, 31, 32 ... Pressing piece, 31d, 32d ... Pressing section, 31f, 32f ... Restricting piece, 31g, 32g ... Mountain-shaped section, 31h, 32h ... Engaging hole, B ... Battery.

Claims (6)

[Claims] 1. A battery fixing device in which a bolt is provided on a bottom plate side of a battery box, and a nut accommodated in the bolt is used to fix a battery housed in the battery box. A battery fixing device for a battery box, characterized in that a center frame is handed over to the center frame, and the above-mentioned bolt is fixedly mounted on the center frame. 2. The battery fixing device for a battery box according to claim 1, wherein the bolt is erected on an upper portion of the center frame, and a base portion of the bolt is welded to an inner peripheral wall of the center frame. 3. A center frame is passed inside the battery box, a nut is fixedly mounted on the center frame, and the battery housed in the battery box is fixed by a bolt side screwed to the nut. Battery fixing device for battery box. 4. A battery fixing device in which a bolt is provided on the bottom plate side of a battery box, and a nut is screwed into the bolt to fix the battery housed in the battery box. , A plurality of batteries are accommodated in parallel in the width direction and the length direction, and a pair of pressing pieces having a rotation-stopping structure are vertically stacked on the upper part of the bolt to be attached in an X shape in plan view. Are pressed by the nuts so that each of the four batteries arranged radially around the bolt is individually pressed by each pressing portion of the X-shaped pressing piece in plan view. A battery fixing device for a battery box, which is characterized by: 5. A battery box fixing device in which a bolt is erected on a bottom plate side of a battery box, and a nut housed in the bolt is used to fix a battery housed in the battery box. Inside, a plurality of batteries are accommodated in parallel in the width direction and the length direction, and the opposing ends of a pair of pressing pieces having a rotation-stopping structure are vertically stacked on top of the above-mentioned bolt to form an H-shape in plan view. It is attached to a mold, and the pressing parts are provided on the left and right of each of the pressing pieces, and the overlapped parts of the pressing pieces are fastened with the nuts screwed to the bolts, and the four parts are arranged radially around the bolts. A battery fixing device for a battery box, characterized in that each of the batteries is individually pressed by each of the left and right pressing portions of the above-mentioned H-shaped pressing piece in plan view. . 6. A battery box fixing device in which a bolt is erected on a bottom plate side of a battery box, and a nut housed in the bolt is used to fix a battery housed in the battery box. Inside, a plurality of batteries are accommodated in parallel in the width direction and the length direction, and the opposing ends of a pair of pressing pieces having a rotation-stopping structure are vertically stacked on top of the above-mentioned bolt to form an H-shape in plan view. Attached to a mold, the pair of pressing pieces have the same shape, and each has a pressing portion on the left and right, and mountain-shaped portions protruding to the inside and the back side of each of the pressing portions. One of the pair of pressing pieces is attached to the other. On the other hand, they are arranged upside down, and the overlapping portions of the pressing pieces are tightened with the nuts from above, and the leg portions of one pressing piece and the chevron portions of the other pressing piece are used to form 4 pieces.
A battery fixing device for a battery box, wherein the upper surface of each battery is fixed.