JPH1059220A - Battery frame seal structure - Google Patents

Abstract

(57) [Problem] When a sealing material having a foaming property is filled and molded into a groove having a rectangular cross section, the sealing material spreads laterally from an opening of the groove when the sealing material is foamed, and the foaming height is increased. However, there is a problem that it is difficult to manage the sealing material and the sealing material after foaming is easily peeled off. SOLUTION: A battery frame 1 attached to a lower part of a vehicle body floor of an electric vehicle to store a plurality of batteries.
0, a sealing groove 20 is formed along the longitudinal direction on the upper surface of the battery frame, and the sealing groove 20 is formed by filling the sealing groove 20 with a sealing material E having a foaming property. A battery frame sealing structure in which an opening width in a cross section orthogonal to a longitudinal direction is formed smaller than an internal width.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery frame sealing structure mounted on a vehicle body floor of an electric vehicle and used to store a plurality of batteries.

[0002]

2. Description of the Related Art A battery frame of an electric vehicle has, for example, a structure in which a plurality of frame members are combined in accordance with the shape of a vehicle body floor. It is designed to store a battery.

In this type of battery frame, a seal structure is provided to protect the battery from water. In this sealing structure, three grooves are formed along the longitudinal direction on the upper surface of the battery frame, which is a contact surface with the vehicle body floor, and two grooves on both sides are filled with a foaming sealing material. The central groove is used for drainage, draining water that has penetrated beyond the outer seal material from the central groove, and reducing the water pressure applied to the inner seal material. Had to be raised.

[0004]

However, in the conventional battery frame sealing structure as described above, a sealing material having a foaming property is filled and molded in a groove having a rectangular cross section. Are spread laterally from the opening of the groove, and it is difficult to control the foaming height, and there is a problem that the sealing material after foaming is easily peeled off, and it is a problem to solve such a problem. Was.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and obtains a stable foaming height of a foaming sealing material in a sealing groove provided in a battery frame of an electric vehicle. It is another object of the present invention to provide a battery frame sealing structure capable of improving the peel strength of a sealing material after foaming.

[0006]

According to a first aspect of the present invention, there is provided a battery frame sealing structure which is attached to a lower portion of a vehicle body floor of an electric vehicle and accommodates a plurality of batteries on an upper surface of the battery frame. In the sealing structure of the battery frame, a sealing groove is formed along with the sealing groove, and a sealing material having a foaming property is filled and formed in the sealing groove. Claim 2 is a configuration in which the inner side surface of the sealing groove is inclined, and Claim 3 is a configuration in which a projection is provided on the inner bottom surface of the sealing groove. 4, the groove for the seal, the inclination angle of the inner side surface is 50 to 70 degrees,
It has a configuration with a projection at the center of the inner bottom surface,
The above configuration is a means for solving the problem.

[0007]

In the battery frame sealing structure according to the first aspect of the present invention, the sealing groove is formed by making the opening width of the sealing groove smaller than the internal width thereof and filling the sealing groove with a sealing material. When the material is foamed, the sealing material is prevented from spreading laterally from the opening of the sealing groove, so that a predetermined foaming height can be obtained, and the foamed sealing material peels from the sealing groove. It becomes difficult.

[0008] In the battery frame sealing structure according to the second aspect of the present invention, since the inner side surface of the sealing groove is formed as an inclined surface, the foaming of the sealing material is performed smoothly and directionally. The foaming height can be obtained, and the sealing material after foaming becomes difficult to peel off from the sealing groove. In addition, the sealing groove can have a smaller cross-sectional area in a cross section orthogonal to the longitudinal direction as compared with a rectangular shape by making the inner side surface an inclined surface, thereby reducing the amount of sealing material used. obtain.

In the battery frame sealing structure according to the third aspect of the present invention, since the protrusion is provided on the inner bottom surface of the sealing groove, the contact area between the sealing material and the inner surface of the sealing groove is enlarged, and the sealing member is peeled off. The strength is further increased, and the cross-sectional area is reduced, so that the usage amount of the sealing material can be reduced.

In the battery frame sealing structure according to a fourth aspect of the present invention, the sealing material is smoothly and directionally foamed by the inclined surface, as in the first to third aspects. At the time, the sealing material is prevented from spreading laterally from the opening of the sealing groove, and a predetermined foaming height is obtained, and the foamed sealing material is less likely to peel from the sealing groove, In addition, the contact area between the sealing material and the inner surface of the sealing groove is enlarged by the protrusion, and the peel strength is further increased, and
The cross-sectional area is reduced, and the amount of use of the sealing material can be reduced.

[0011]

According to the battery frame sealing structure according to the first aspect of the present invention, when the sealing material is foamed, the sealing material is prevented from spreading laterally from the opening of the sealing groove, so that the sealing material is stable. It is possible to obtain a foaming height of the sealing material, and thereby obtain good watertightness with the vehicle body floor. Further, since the opening width of the sealing groove is reduced, the sealing material after foaming is hardly peeled off from the sealing groove, and the peel strength of the sealing material can be greatly increased.

According to the battery frame sealing structure of the second aspect of the present invention, the sealing material can be smoothly and directionally foamed by the inclined surface.
A stable foaming height can be obtained, and the peel strength of the sealing material after foaming can be increased. In addition, since the inner side surface of the sealing groove is an inclined surface, it is possible to reduce the cross-sectional area in a cross section orthogonal to the longitudinal direction as compared with a rectangular case, and accordingly, the amount of sealing material used is reduced. This can contribute to cost reduction and the like.

According to the battery frame sealing structure of the third aspect of the present invention, the same effects as those of the first and second aspects can be obtained. The area of contact with the inner surface can be increased to increase the peel strength, and the cross-sectional area can be reduced to further reduce the amount of sealing material used.

According to the battery frame sealing structure of the fourth aspect of the present invention, similarly to the first to third aspects, the sealing material can be smoothly and directionally foamed by the inclined surface. When the material is foamed, the sealing material is prevented from spreading laterally from the opening of the sealing groove, so that a stable foaming height can be obtained, and the sealing material after foaming is not easily separated from the sealing groove. As a result, the peel strength of the sealing material can be greatly increased.
In addition, the contact area between the sealing material and the inner surface of the sealing groove can be increased by the protrusions to further increase the peel strength, and the cross-sectional area can be reduced to reduce the amount of the sealing material used.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a battery frame sealing structure according to the present invention will be described below with reference to the drawings.

FIG. 2 shows a vehicle body floor of an electric vehicle. The vehicle body floor has a floor member 2 joined to a lower side of a floor panel 1. The floor member 2 includes side members 3 provided on both sides along the front-rear direction, and three cross members 4, 5, 6 in the vehicle width direction mounted between the side members 3, 3. An L-shaped sub-member 7 is provided between the member 5 and the side member 3. A side sill 9 is attached to an outer wall of each side member 3 via a plurality of outriggers 8.

A battery frame 10 is provided below the vehicle body floor. The battery frame 10
For example, it is formed of a plurality of members made of an extruded material made of an aluminum alloy, and is detachably attached to the side members 3 and the cross members 4 and 6.

The battery frame 10 has a side frame 11 on both sides as a frame extending in the front-rear direction, and a front frame 12 and a rear frame 13 on the front and rear portions as frames extending in the vehicle width direction. At the rear end of each side frame 11, an L-shaped sub-frame 14 is provided as a frame connected to the rear frame 13.

A horizontal frame 15 is provided between the two side frames 11 along the vehicle width direction, and between the horizontal frames 15 and between the horizontal frame 15 and the rear frame 13 along the front-rear direction. A vertical frame 16 is provided. The horizontal frame 15 and the vertical frame 16 arranged in a lattice form allow the plurality of storage units 1
8 are formed, and the battery 17 is fixed to each of the storage portions 18 by a mounting bracket 19 in a pair.

The sealing structure of the battery frame 10 is such that a sealing groove is formed on the upper surface of the side frame 11, the front frame 12, the rear frame 13 and the sub-frame 14 constituting the periphery of the battery frame 10. Is provided with a sealing material. That is,
FIG. 1 illustrates the side frame 11 by way of example. A sealing groove 20 is formed along the longitudinal direction of the side frame 11, and a sealing material having a foaming property is filled in the sealing groove 20. . In addition, for example, three sealing grooves 20 are formed along the longitudinal direction of the side frame 11, and two sides are filled with a sealing material, and the center is used as a drain groove.

The width of the opening of the sealing groove 20 is smaller than the inner width thereof in a cross section orthogonal to the longitudinal direction. More specifically, the sealing groove 20 has inclined inner surfaces 20a on both sides, and a projection A at the center of the inner bottom surface 20b. The protrusion A shown in FIG. 1 has a rectangular shape. Then, the sealing groove 20 is filled with a sealing material having a foaming property, and the sealing material E is foamed so as to protrude from the sealing groove 20 as shown by a virtual line in FIG.

As described above, in the sealing structure of the battery frame, since the opening width of the sealing groove 20 is made smaller than the internal width, when the sealing material E filled in the sealing groove 20 is foamed, Since the sealing material E does not spread laterally from the opening of the sealing groove 20, and in particular, the inner side surface 20 a is an inclined surface, the foaming of the sealing material E smoothly and directionally along the inner side surface 20 a. Then, a predetermined foaming height h is stably obtained. Thereby, the battery frame 10 can obtain good watertightness between the battery frame 10 and the vehicle body floor.

In the above-described sealing structure, the cross-sectional shape of the sealing groove 20 having an opening width smaller than the inner width makes it difficult for the foamed sealing material E to peel off from the sealing groove 20. The inner surface of the sealing groove 20 and the sealing material E are formed by the inclined inner side surface 20a and the projection A.
Since the contact surface with the metal is enlarged, the peel strength is further increased.

Furthermore, in the above-described sealing structure, the inner side surface 20a of the sealing groove 20 is formed as an inclined surface, so that the cross-sectional area can be made smaller than that of the rectangular shape. Since the area is reduced, the amount of use of the sealing material E is correspondingly reduced, and cost reduction by saving the sealing material E is also realized.

Here, in order to obtain a predetermined foaming height and peel strength of the sealing material in the sealing structure of the battery frame, an experiment was conducted by changing various dimensions of the sealing groove.

First, as control factors in the sealing groove, as shown in FIG. 3, in the longitudinal section of the sealing groove 20, the inclination angle (groove angle) C of the inner side face 20a,
The groove depth D, the width (groove width) F of the inner bottom surface 20b, and the presence or absence of the protrusion A are given. The control factors of the sealing material E include the application amount (filling rate) B, the material (E), the foaming temperature G, and the application speed H. In addition, as the sealing material E, a normal temperature firing type material and a hot heating type material were used. Then, different levels were set for each control factor of the sealing groove 20 and the sealing material E.
Table 1 shows the settings.

[0027]

[Table 1]

Next, each control factor and each level shown in Table 1 were combined. Table 2 shows the combinations.

[0029]

[Table 2]

An experiment was conducted for each combination shown in Table 2 using a jig 30 shown in FIG. Jig 3
Reference numeral 0 designates a pair of groove forming members 32, 32 forming the inner side wall of the sealing groove and a projection forming member 33 detachable from a base 31 forming the inner bottom surface of the sealing groove. A groove forming member 32 having an inclination angle corresponding to each level is prepared.

As the error factors, the temperature of the jig and the ambient temperature are set to the normal temperature of the jig and the normal temperature of the ambient temperature.
Only the ambient temperature rises by 10 ° C, only the jig temperature rises by 10 ° C, both the jig temperature and the ambient temperature are 10 ° C
The experiment was performed under these conditions, which was selected as rising.

The results of the experiment are shown in FIGS. The S / N ratio in FIGS. 5 and 6 indicates the S / N ratio in quality engineering, and is used as a level of how much variation can be suppressed. As the S / N ratio is higher, the target quality level can be reached without variation. The sensitivity in FIG. 5 is used as an index of how close to the target value is. If the sensitivity is high, bring it closer to the target value.

FIG. 5 is a diagram showing the factor and effect of the foaming height created based on the analysis data of the experiment. First, A2, B1, C2, D3, E1, F2, G
When the level of 2, H2 is selected, the most stable foaming height can be ensured. In particular, it can be seen that the optimum value for C: groove angle is at two levels (60 degrees).

FIG. 6A is a diagram showing the factors and effects of the coating efficiency prepared based on the analysis data of the experiment. According to the graph, A1, B1, C2, D1, and E1 are set according to the SN ratio priority condition.
It can be seen that the coating efficiency can be most stably improved when the levels 1, 1, F1, G2, and H1 are selected. C: Regarding the groove angle, almost the same effect is obtained at the levels of 1 and 2 (45 degrees, 60 degrees).

FIG. 6B is a diagram showing the factors and effects of the pull-out force (peel strength) prepared based on the analysis data of the experiment. According to FIG.
It can be seen that when the levels of C1, D3, E1, F2, and G21H1 are selected, the pulling force can be improved most stably. C: It can be seen that the groove angle is the optimum value at one level (45 degrees).

Based on the above results, factors A (1,2), which have a high contribution to each characteristic and have different optimum values for each characteristic,
B (2,3), D (1,3), and G (2,3) were combined to calculate the estimated value of each characteristic. The other factors were fixed (C2, E1, F2, H1) in consideration of the optimum value or the easiness of realistic setting. Table 3 shows the results.

[0037]

[Table 3]

According to Table 3, No. Combination was found to be optimal. In addition, No. It was also found that the combination of (foaming temperature at normal temperature, more G2 → G3) was at a usable level although the coating efficiency and the pull-out force were slightly reduced.

That is, the protrusion A is provided, the application amount (filling rate) B of the sealing material is set to 125%, the inclination angle (groove angle) C of the inner side surface of the sealing groove is set to 60 degrees, and the sealing groove is formed. The groove depth D is 3 mm, the material E of the sealing material is a; the room temperature firing type, the width (groove width) F of the inner bottom surface is 7 mm, and the foaming temperature G of the sealing material is 60 or 30 degrees (normal temperature). If the application speed H of the sealing material is set to 100 mm / s, the sealing material can be filled and molded in the sealing groove in an optimum state, and the following expected quality level can be obtained.

Foaming height 6.28 ± 0.30 mm (at 60 ° foaming) 6.29 ± 0.33 mm (at normal temperature foaming) Coating efficiency 3.0 mm ² / g (at 60 ° foaming) 3.0 mm ² / g (at the time of foaming at room temperature) Pulling force 19.6 kgf / m (at the time of foaming at 60 degrees) 18.5 kgf / m (at the time of foaming at room temperature) Considering the results of the above experiments and analysis, the securing of the foaming height is stable. What contributes to the performance is the groove angle C and the material F of the sealing material. The groove angle C is set to 60 degrees and the groove depth is set to 3 mm. It has been found. Conversely, it was found that although the contribution ratio was low, the stability was slightly reduced when the projections A were present. In order to secure the foaming height, the application rate B of the sealing material E and the contribution rate of the groove depth D are also high, and the highest when the application amount B is 150% and the groove depth D is 2 mm. However, the target foaming height is 5.5 to 7
In the case of the range of mm, it was found that the target can be achieved by setting the application amount B to 125% and the groove depth D to 3 mm.

Next, it is the groove angle C and the groove depth D that contribute to the stability (improvement) of the coating efficiency. The coating efficiency is most maximized when the groove angle C is 60 degrees and the groove depth is as small as possible. Will be higher. However, if the groove depth D is made small, it becomes impossible to obtain the above-mentioned foaming height, so the maximum point of the coating efficiency when 3 mm was selected was selected. The presence or absence of the protrusion A and the groove angle C contribute to the stability (improvement) of the pulling force.
The maximum pulling force is obtained when the protrusion A is present, the groove angle C is 45 degrees, and the groove depth D is 3 mm.

In consideration of such points, in the battery frame sealing structure, the inclination angle (groove angle) of the inner side surface of the sealing groove becomes 50 to 70 as shown in FIG. Degree.

The protrusion A can be a square shape as shown in FIG. 1 or a trapezoidal shape as shown in FIG. In the sealing groove formed in the range of depth, groove width and groove angle, the upper side P shown in FIG.
5-2 mm, the lower side Q is 2-4 mm, and the height R is 1.
5 to 2 mm.

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealing groove for explaining an embodiment of a battery frame sealing structure according to the present invention.

FIG. 2 is a perspective view illustrating an electric vehicle in a state where a vehicle body floor is disassembled.

FIG. 3 is a cross-sectional view for explaining various dimensions of a sealing groove.

FIG. 4 is a perspective view illustrating a jig used for an experiment on a sealing groove and a sealing material.

FIG. 5 is a diagram showing a factor and effect of a foaming height created based on analysis data of an experiment.

6 (a) and 6 (b) are diagrams showing the factors and effects of the drawing force generated based on the analysis data of the experiment.

FIG. 7 is a graph showing the relationship between the magnitude of the groove angle of the sealing groove and the SN ratio with respect to the firing height, the coating efficiency, and the pull-out force.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Battery frame 20 Seal groove 20a Inner side surface 20b Inner bottom surface A Projection E Sealing material

Claims (4)

[Claims] 1. A sealing groove is formed along a longitudinal direction on an upper surface of a battery frame which is attached to a lower portion of a body floor of an electric vehicle and stores a plurality of batteries, and a seal having foaming property is formed in the sealing groove. A sealing structure for a battery frame, wherein a sealing groove is formed such that an opening width in a cross section orthogonal to a longitudinal direction thereof is smaller than an inner width of the sealing groove. 2. The battery frame sealing structure according to claim 1, wherein an inner side surface of the sealing groove is an inclined surface. 3. The battery frame sealing structure according to claim 1, wherein a projection is provided on an inner bottom surface of the sealing groove. 4. The sealing groove has an inner side surface having an inclination angle of 5 degrees.
The sealing structure for a battery frame according to any one of claims 1 to 3, wherein the sealing structure has a projection of 0 to 70 degrees and a center portion of an inner bottom surface.