JP7224193B2 - Battery structure fixing structure - Google Patents

Description

The present invention relates to a fixing structure for battery modules in electric vehicles, hybrid vehicles, and the like.

A vehicle such as an electric vehicle (EV) or a hybrid vehicle (HV) is equipped with a plurality of battery modules for storing electric power supplied to a driving motor. The battery modules mounted on the vehicle are heavy, for example, on the order of several hundred kilograms in total. Also, in an electric vehicle or the like, a plurality of battery modules are collectively mounted as a unit (battery unit). Therefore, the battery modules and battery units are firmly fixed to, for example, a highly rigid portion such as a vehicle body so as not to move during normal use.

As a structure for fixing a plurality of battery modules to a floor panel, for example, as disclosed in Patent Literature 1 below, a plurality of battery modules are housed in a housing with an open top, and the housing has an open top. A structure has been proposed in which a flange projecting from an upper edge is fixed to the lower surface of a floor panel with bolts and nuts.

JP-A-2000-344148

However, in a vehicle equipped with the above-described battery module, battery unit, etc. (hereinafter also referred to as "battery structure"), when a large impact is applied to the vehicle due to, for example, a collision, the vehicle and the battery structure may be damaged. can also have a large impact. Specifically, for example, when the front of the vehicle collides with a wall or the like, after the front portion of the vehicle is damaged, the inertial force due to the heavy battery structure acts toward the front of the vehicle, further damaging the vehicle. or a large impact may be applied to the battery structure. Therefore, in order to further improve the safety of a vehicle equipped with a battery structure, it is desirable to have a configuration that can reduce the above possibility.

Accordingly, the present invention provides a battery structure capable of controlling how a load is applied from the battery structure to the vehicle and the impact acting on the battery structure when a shock is applied to a vehicle equipped with the battery structure. The purpose was to provide an object fixing structure.

(1) A battery structure fixing structure of the present invention provided to solve the above-described problems is a structure for fixing a battery structure in a vehicle on which a battery structure including a battery is mounted, wherein the battery structure is fixed to the battery structure. Alternatively, an integrated fixing portion, a fixed portion fixed or integrated with the vehicle, and a fastening member for fastening the fixing portion to the fixed portion, wherein the fixing portion connects the fastening member. An insertion hole for insertion and a weakened portion provided so as to be continuous with or adjacent to the insertion hole, and the weakened portion is continuous with or adjacent to the insertion hole in the fixing portion It is characterized by being more fragile than other parts of the body.

In the battery structure fixing structure of the present invention, an insertion hole for inserting a fastening member is provided in the fixing portion on the battery structure side, and a fragile portion is provided so as to be continuous with or adjacent to the insertion hole. ing. Also, the fragile portion is made weaker than other portions that are continuous with or adjacent to the insertion hole in the fixed portion. Therefore, when a vehicle on which the battery structure is mounted is subjected to an impact, the load of the battery structure acts on the fragile portion, causing the fragile portion to deform or break while the battery structure slides. Therefore, according to the battery structure fixing structure of the present invention, when a vehicle mounted with a battery structure is subjected to an impact or the like, the load applied from the battery structure to the vehicle and the impact acting on the battery module are controlled. You can control it.

(2) In the battery structure fixing structure described above, the fragile portion may be provided at a position continuous with or adjacent to the insertion hole in the longitudinal direction of the vehicle.

According to such a configuration, it is possible to optimize how the load is applied from the battery module to the vehicle and the impact acting on the battery module, assuming the case where the vehicle collides in the front or rear.

(3) In the battery structure fixing structure described above, the fragile portion may be provided at a position continuous with or adjacent to the insertion hole in the left-right direction of the vehicle.

According to this configuration, it is possible to optimize the load applied from the battery module to the vehicle and the impact acting on the battery module, assuming a case such as a collision on the side of the vehicle.

(4) In the battery structure fixing structure described above, the battery structure may be a battery module obtained by modularizing the battery.

With such a configuration, it is possible to control how the load is applied from the battery module to the vehicle and the impact acting on the battery module when an impact is applied to the vehicle.

(5) In the battery structure fixing structure described above, the battery structure is a battery unit in which a plurality of battery modules obtained by modularizing the batteries are housed inside a case, and the fixing portion is fixed to the case or It is preferable that they are integrated.

With such a configuration, it is possible to control how the load is applied from the battery unit to the vehicle and the impact acting on the battery unit when the vehicle is subjected to an impact or the like.

(6) In the battery structure fixing structure described above, the battery structure may be fixed in a state of being suspended from the vehicle body.

ADVANTAGE OF THE INVENTION According to the present invention, when a vehicle mounted with a battery structure is subjected to an impact or the like, the battery structure can control how the load is applied from the battery structure to the vehicle and the impact acting on the battery structure. A structure fixing structure can be provided.

1 is a plan view showing a battery structure fixing structure according to an embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; (a) is a plan view showing the configuration of an extending portion, and (b) is a plan view showing the configuration of a fixing portion. (a) is a plan view showing a modification of the extending portion, and (b) is a plan view showing a modification of the fixing portion. FIG. 5 is a cross-sectional view showing a battery structure fixing structure according to a modification; It is explanatory drawing which shows the modification of a weak part.

Hereinafter, a battery structure fixing structure 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, terms indicating positional relationships such as front, rear, left, and right are based on the state of being installed in a vehicle unless otherwise specified.

As shown in FIGS. 1 and 2, a battery structure fixing structure 1 is a structure for fixing battery modules 3 and battery units 10 to a vehicle body 2 of a vehicle such as an electric vehicle or a hybrid vehicle. Specifically, the battery structure fixing structure 1 includes a portion for fixing the battery unit 10 to the cross member 5 forming the vehicle body 2 and a plurality of parts for the case 7 of the battery unit 10 fixed to the vehicle body 2 side. It is used in the part where the battery module 3 is fixed.

A vehicle body 2 forming the vehicle of this embodiment includes a pair of left and right floor side members 4 and a plurality of cross members 5 . The pair of floor side members 4 are spaced apart from each other in the left-right direction (vehicle width direction). The plurality of cross members 5 are spaced apart from each other in the front-rear direction, spanned between the pair of floor side members 4, and extend in the left-right direction. Thereby, the floor side member 4 and the cross member 5 form a ladder-like structure.

The vehicle of this embodiment includes a battery unit 10 . The battery unit 10 accommodates a plurality of (two in this embodiment) battery modules 3 fixed to the case 7 . The case 7 is provided with an internal plate 11, a lower cover 12 and an upper cover 13, as will be detailed later. The battery unit 10 is arranged so as to straddle between a pair of cross members 5 adjacent to each other in the front-rear direction, and is fastened to the pair of cross members 5 by fastening members 14 .

Specifically, the front end portion and the rear end portion (parts extending in the left-right direction) of the peripheral end portion 16 of the internal plate 11 constitute a fixing portion 10 a for fixing to the cross member 5 . . Four insertion holes 51a are provided at the front and rear ends of the peripheral end portion 16 . As shown in FIG. 2, each insertion hole 51a vertically penetrates the peripheral end portion 16 of the internal plate 11. As shown in FIG. Further, the peripheral end portion 16 is provided with a fragile portion 51b provided so as to continue from the insertion hole 51a in the front-rear direction (forward in this embodiment) of the vehicle body 2 . The fragile portion 51b is formed by a slit extending in the longitudinal direction of the vehicle body 2 while being continuous with the insertion hole 51a. The fragile portion 51b is weaker in strength than other portions adjacent to the insertion hole 51a.

Further, the front end and rear end of the flange portion 33 of the lower cover 12 are fixed portions for fixing to the cross member 5 in the same manner as the front end and rear end of the peripheral end portion 16 of the inner plate 11 described above. 10a. Insertion holes 52a are formed in the front end and the rear end of the flange portion 33 so as to penetrate vertically at positions corresponding to the respective insertion holes 51a. Further, the flange portion 33 is provided with a fragile portion 52b provided so as to continue from the insertion hole 52a in the front-rear direction (forward in this embodiment) of the vehicle body 2 . The fragile portion 52b is formed by a slit extending in the longitudinal direction of the vehicle body 2 while being continuous with the insertion hole 52a. The fragile portion 52b is weaker in strength than other portions adjacent to the insertion hole 52a.

The fastening member 14 is, for example, a flat screw or the like. The upper surfaces of the front and rear ends of the peripheral end portion 16 of the internal plate 11 are in contact with the lower surface of the cross member 5, and the fastening member 14 is inserted through the insertion holes 51a and 52 of the lower cover 12 from below. . A distal end portion of the fastening member 14 is fastened to the cross member 5 to the cross member 5 . In this manner, battery unit 10 is fixed to cross member 5 . That is, the battery unit 10 uses the cross member 5 as a fixed portion, and the peripheral end portion 16 of the inner plate 11 and the flange portion 33 of the lower cover 12 as fixed portions to be fixed to the cross member 5 (fixed portion). It is fixed by fastening using members 14 to form the battery structure fixing structure 1 .

Each battery module 3 stores electric power to be supplied to a motor (not shown) for driving the vehicle. The battery module 3 has a substantially rectangular parallelepiped shape.

A plurality (two in this embodiment) are provided inside the case 7 of the battery unit 10 . The battery module 3 has an internal plate 11 (see FIG. 2) of the case 7 fixed to the vehicle body 2 side as a fixed portion, and an extending portion 21 of the battery module 3 is fixed to the internal plate 11 (fixed portion). It is fixed to the vehicle body 2 by fastening with bolts 24 (fastening members) to form the battery structure fixing structure 1 . Each member used for fixing the battery module 3 will be described in more detail below.

The internal plate 11 is made of sheet metal, for example. As shown in FIG. 1, the internal plate 11 has a substantially rectangular shape in plan view. As shown in FIG. 2, the central portion 15 of the internal plate 11 is formed as a substantially rectangular recess in plan view that is recessed downward with respect to the peripheral edge portion 16 therearound. In other words, the internal plate 11 has a step between the central portion 15 and the rectangular annular peripheral edge portion 16 surrounding the central portion 15 so that the peripheral edge portion 16 becomes higher. The connecting portion of the has a crank-shaped cross section. Thereby, the internal plate 11 has high rigidity at the connecting portion (step portion) between the central portion 15 and the peripheral end portion 16 .

As shown in FIGS. 1 and 2, the battery modules 3 are arranged below the internal plate 11 so as to be aligned in the left-right direction and extend in the front-rear direction. Four extensions 21 are provided at the upper end of each battery module 3 . The extending portions 21 are provided in the vicinity of the four corners of the battery module 3 so as to protrude outward, and have a substantially rectangular plate shape. Two circular insertion holes 22a are formed in each extending portion 21 so as to penetrate vertically at predetermined intervals in the longitudinal direction of the vehicle. Further, the extending portion 21 is provided with a fragile portion 22b provided so as to continue from the insertion hole 22a in the front-rear direction (forward in this embodiment) of the vehicle body 2 . The fragile portion 22b is formed by a slit extending in the longitudinal direction of the vehicle body 2 while being continuous with the insertion hole 22a. The fragile portion 22b is weaker in strength than other portions adjacent to the insertion hole 22a.

The battery module 3 is fastened to the inner plate 11 with bolts 24 and nuts 25 . Specifically, the upper surface of each extending portion 21 of the battery module 3 is in contact with the lower surface of the internal plate 11 . The central portion 15 of the internal plate 11 is formed with through-holes 23 that communicate with the through-holes 22a of the extension portions 21 vertically. A bolt 24 is inserted through the insertion holes 22a and 23 from below, and a nut 25 is screwed onto the tip of the bolt 24 protruding upward from the internal plate 11, thereby connecting the head of the bolt 24 and the nut 25 together. Each extending portion 21 and the inner plate 11 are fastened between them.

The lower cover 12 is made of resin. The lower cover 12 has an open upper surface and has a box-like shape capable of housing a plurality of (two in this embodiment) battery modules 3 collectively. Specifically, the lower cover 12 includes a substantially rectangular plate-shaped bottom plate portion 31 that collectively faces the plurality of battery modules 3 from below, and a bottom plate portion 31 that rises upward from the peripheral edge portion of the bottom plate portion 31 to cover the plurality of battery modules 3 . and a flange portion 33 projecting from the upper end portion of the peripheral plate portion 32 to the periphery thereof in a flange-like manner. In a plan view, the outer shape of the lower cover 12 is substantially the same as the outer shape of the inner plate 11 .

The lower cover 12 accommodates the plurality of battery modules 3 attached to the internal plate 11 in a space defined by the bottom plate portion 31 and the peripheral plate portion 32 , and the upper surface of the flange portion 33 extends from the peripheral end portion 16 of the internal plate 11 . provided in contact with the lower surface of the As shown in FIG. 1, the lower cover 12 is fixed to the inner plate 11 by a plurality of bolts 38 and nuts (not shown).

The upper cover 13 is a plate-like body made of resin, for example. As shown in FIG. 1, the upper cover 13 has a substantially rectangular shape that is smaller than the inner plate 11 in plan view. As shown in FIG. 2, the central portion 41 of the upper cover 13 is formed as a substantially rectangular convex portion that protrudes upward with respect to the peripheral end portion 42 of the periphery thereof.

As shown in FIG. 1, the upper cover 13 is provided so that the lower surface of the peripheral edge portion 42 of the upper cover 13 contacts the upper surface of the peripheral edge portion 16 of the internal plate 11 and covers the central portion 15 of the internal plate 11 from above. ing. The upper cover 13 is fixed to the inner plate 11 with a plurality of bolts 43 and nuts 44. As shown in FIG.

The battery unit 10 and the battery module 3 can be fixed to the vehicle body 2 side, for example, as follows. That is, first, after fixing the battery module 3 to the inner plate 11 via the extending portion 21, the battery module 3 is fixed inside the case 7 by attaching the lower cover 12 and the upper cover 13 to the inner plate 11. structure. Thereafter, battery unit 10 is fixed to vehicle body 2 by fixing inner plate 11 and lower cover 12 to cross member 5 using fastening members 14 . When fixed in this manner, the portion where the internal plate 11 and the lower cover 12 and the cross member 5 are fixed using the fastening member 14 and the battery module 3 are attached to the internal plate 11 via the extending portion 21 . A battery structure fixing structure 1 is formed at a portion fixed to the inner plate 11 by pressing.

As described above, the vehicle exemplified in this embodiment employs the battery structure fixing structure 1 as a structure for fixing the battery module 3 in the vehicle mounted with the battery module 3 including the battery. Specifically, the battery structure fixing structure 1 for fixing the battery module 3 includes an extending portion 21 (fixing portion) fixed or integrated with the battery module 3 and fixed or integrated with the vehicle body 2 side. and bolts 24 for fastening the extending portion 21 to the internal plate 11 . Further, the extending portion 21 has an insertion hole 21a for inserting the bolt 24, and a fragile portion 22b provided so as to be continuous with the insertion hole 21a. In addition, the fragile portion 22b is made weaker than other portions of the extending portion 21 that are continuous with or adjacent to the insertion hole 21a. With such a configuration, when the vehicle body 2 is subjected to a large impact due to a collision or the like, the load of the battery module 3 acts on the fragile portion 22b. As a result, the battery module 3 slides while deforming or breaking the fragile portion 22b. Therefore, according to the configuration described above, the load acting on the vehicle body 2 from the battery module 3, the load acting on the battery module 3, and the sliding amount of the battery module 3 can be minimized.

In addition, in the vehicle exemplified in the present embodiment, the battery structure fixing structure 1 is employed as the structure for fixing the battery unit 10 including the battery module 3 described above. Specifically, the battery structure fixing structure 1 used for fixing the battery unit 10 includes a fixing portion 10 a of the battery unit 10 , a cross member 5 constituting the vehicle body 2 , and the fixing portion 10 a fastened to the cross member 5 . A fastening member 14 is provided. The fixed portion 10a also has insertion holes 51a and 52a through which the fastening member 14 is inserted, and fragile portions 51a and 52a that are continuous with or adjacent to the insertion holes 51a and 52a. The fragile portions 51a and 52a are weaker than other portions that are continuous with or adjacent to the insertion holes 51a and 52a in the fixed portion 10a. Therefore, when an impact is applied to the vehicle body 2 on which the battery unit 10 is mounted, the load of the battery unit 10 acts on the fragile portions 51a and 52a, deforming or breaking the fragile portions 51a and 52a, and causing the battery unit to break. 10 slides. Therefore, if the battery structure fixing structure 1 is adopted as the structure for fixing the battery unit 10 as described above, when the vehicle body 2 on which the battery unit 10 is mounted is subjected to an impact, the load from the battery unit 10 to the vehicle body 2 is reduced. The application of force, the impact acting on the battery unit 10, and the sliding amount of the battery unit 10 can be minimized.

In the embodiment described above, the fragile portion 22b of the extension portion 21 used for fixing the battery module 3 is provided at a position continuous with or adjacent to the insertion hole 21a in the longitudinal direction of the vehicle body 2 . Therefore, when the vehicle body 2 collides in the front or the rear, it is possible to optimize how the load is applied from the battery module 3 to the vehicle body 2 and the impact acting on the battery module. Note that the fragile portion 22b described above does not necessarily need to be provided at a position continuous with or adjacent to the insertion hole 21a in the front-rear direction. may be provided in According to such a configuration, it is possible to optimize the load applied from the battery modules to the vehicle body 2 and the impact acting on the battery modules 3, assuming a case such as a collision on the side of the vehicle body 2 .

Similarly, in the battery structure fixing structure 1 described above, the fragile portions 51a and 52a are provided at positions continuous with or adjacent to the insertion holes 51a and 52a in the longitudinal direction of the vehicle body 2. good. Therefore, when the vehicle body 2 collides in the front or the rear, the load applied from the battery unit 10 to the vehicle body 2 and the impact acting on the battery unit 10 are controlled. can be optimized. It should be noted that the fragile portions 51a and 52a described above do not necessarily need to be continuous in the front-rear direction with respect to the insertion holes 51a and 52a, or be provided at positions adjacent to each other. may be provided at adjacent positions. According to such a configuration, it is possible to optimize the load applied from the battery unit 10 to the vehicle body 2 and the impact acting on the battery unit 10, assuming a case such as a collision on the side of the vehicle body 2 .

In the above-described embodiment, an example in which the battery structure fixing structure 1 is used for fixing the battery module 3 and fixing the battery unit 10 is shown, but the present invention is not limited to this. That is, the battery structure fixing structure 1 may be employed only for either fixing the battery module 3 or fixing the battery unit 10 . Moreover, the battery structure fixing structure 1 may be provided at a position other than the position illustrated in the above embodiment. For example, a flange or the like extending from the battery module 3 toward the side members 4, 4 may be provided, and the battery structure fixing structure 1 may be applied to a fixing portion between the flange and the side members 4, 4, or the like.

Also, the configurations of the battery module 3 and the battery unit 10 described above are merely examples, and the battery structure fixing structure 1 can be employed for fixing a configuration different from that described above. . For example, like the battery unit 60 shown in FIG. It is preferable to employ the above-described battery structure fixing structure 1 at the location where the battery structure is fixed to 72 .

Further, in the present embodiment, as shown in FIG. Although an example configured by slits formed so as to be continuous with the insertion holes 51a and 52a has been shown, the present invention is not limited to this. For example, one or both of the fragile portion 22b provided in the extending portion 21 and the fragile portions 51b and 52b provided in the fixing portion 10a of the battery unit 10 may be inserted into the insertion hole 21a or the insertion hole as shown in FIG. A portion adjacent to 51a and 52a may be formed so as to be more fragile than other portions.

Further, the fragile portions 22b, 51b, and 52b provided on the extending portion 21 and the fixing portion 10a are not limited to the above-described forms. For example, it consists of a bead provided at a position adjacent to the through holes 22a, 51a, 52a like the weakened portion 80 shown in FIG. 6(a), or a notch like the weakened portion 82 shown in FIG. It is preferable to provide one or a plurality of members formed by bending positions adjacent to the through holes 22a, 51a, 52a like the fragile portion 84 shown in FIG.

It should be noted that the present invention is not limited to those exemplified in the above-described embodiments and modifications, and those skilled in the art will recognize that other embodiments are possible from the teachings and spirit of the invention without departing from the scope of the claims. easy to understand.

INDUSTRIAL APPLICABILITY The battery structure fixing structure of the present invention can be suitably used for fixing a battery structure in general vehicles on which a battery structure including a battery is mounted.

1: Battery structure fixing structure 2: Vehicle body 3: Battery module (battery structure)
5: Cross member (fixed part)
7: Case 10: Battery unit (battery structure)
10a: Fixed part 11: Internal plate (fixed part)
21: Extension part (fixed part)
22a: insertion hole 22b: fragile portion 23: insertion hole 24: bolt (fastening member)
51a: insertion hole 51b: fragile portion 52: insertion hole 52a: insertion hole 52b: fragile portion

Claims (3)

A fixing structure for a battery structure in a vehicle equipped with a battery structure including a battery,
a case for fixing and housing the battery structure;
a fixing portion fixed to or integrated with the battery structure;
a fixed portion fixed or integrated with the vehicle;
a fastening member that fastens the fixed portion to the fixed portion;
the case is
an inner plate to which the battery structure is fastened and which serves as the fixed portion;
a lower cover capable of accommodating a battery structure attached to the inner plate;
an upper cover attached to cover the inner plate;
The fixed part is
an insertion hole for inserting the fastening member;
and a fragile portion provided so as to be continuous or adjacent to the insertion hole,
The battery structure fixing structure, wherein the fragile portion is weaker than other portions that are continuous with or adjacent to the insertion hole in the fixing portion. 2. The structure for fixing a battery structure according to claim 1, wherein a concave portion having a substantially rectangular shape in plan view is formed in the central portion of the inner plate, the concave portion being concave downward with respect to the peripheral end portion of the inner plate. The vehicle comprises a plurality of cross members,
The insertion hole for inserting the fastening member is provided at the peripheral end of the internal plate,
The fragile portion is provided so as to be continuous with the insertion hole,
3. The battery structure fixing structure according to claim 2, wherein the cross member and the internal plate are fastened by the fastening member.

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