JP2011126452A - Structure for mounting battery for electric vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a supporting posture of a battery by improving an accuracy of a face for mounting a battery to a vehicle body floor and facilitating automation of mounting a battery. <P>SOLUTION: Six locking mechanisms 22 for mounting a battery 2 to a vehicle body floor 5 are installed in front of a side member coupling part 7a between a left front side member 7 and a left rear side member 11 and a side member coupling part 8a between a right front side member 8 and a right rear side member 12, and two locking mechanism 22 are installed after the coupling parts. Among the six front locking mechanisms 22, two mechanisms each, four mechanisms in total are arranged on both side of a vehicle width direction in front of the battery 2, and the two mechanisms are arranged at a front end of the battery 2. The two rear locking mechanisms 22 are arranged on both sides of a vehicle width direction on a rear side of the battery 2. Accordingly, the battery 2 has a mounting strength sharing proportion to the front portion of the vehicle body floor 5 of high strength higher than that to the rear portion of the vehicle body floor 5 of low strength. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention is an electric vehicle equipped with an electric motor such as an electric vehicle or a hybrid vehicle.
The present invention relates to an attachment structure for attaching a battery for an electric motor to a vehicle body floor.

  In an electric vehicle such as an electric vehicle or a hybrid vehicle, a large-capacity and large-sized battery (a unit obtained by connecting a large number of batteries to each other) is required for an electric motor.

Such a battery is not only large, but heavy (for example, about 400 kg in the case of an electric vehicle), and when it is detachable or permanently attached to the vehicle body, it is designed to avoid the vehicle body's center of gravity becoming high and unstable. In addition, a device for balancing the vehicle weight in the vehicle width direction is necessary.
Therefore, when attaching a large and heavy battery to the vehicle body, this battery is placed below the vehicle body floor and attached so that the center of the battery in the vehicle width direction is located approximately in the middle of the vehicle width direction. It is common.

When the battery is attached to the lower side of the vehicle body floor, the thickness of the battery (the vehicle vertical dimension) cannot be increased, and the size of the battery in the vehicle width direction (the battery width) Is not allowed to protrude beyond the width of the car,
If it is attempted to increase the capacity of the battery so as to satisfy the requirements of the electric vehicle, it is inevitable that the size of the battery in the vehicle front-rear direction (the length of the battery) increases.

Conventionally, for example, a technique described in Patent Document 1 has been proposed as a technique for arranging and attaching a battery that has become long due to an increase in capacity under the vehicle body floor.
This proposed technology is configured to attach the battery to the vehicle body floor at a number of locations on both sides in the vehicle width direction.

Japanese Patent Laid-Open No. 08-150841 (FIG. 6)

  However, the above-mentioned conventional proposed technique causes a large number of vehicle body floor mounting points of the battery to be equally arranged on both sides of the battery in the vehicle width direction, resulting in the following problems.

In other words, the vehicle body floor includes left and right front side members and left and right rear side members on both sides in the vehicle width direction, and left and right side members formed by connecting the front and rear direction front ends of the left and right rear side members to the rear end of the left and right front side members. Although it is the main body floor skeleton member,
Left and right front and rear side members sandwiching the left front and rear side member joints between the left front side member and the left rear side member and the right front and rear side member joints between the right front side member and the right rear side member From the viewpoint of occupant protection, the strength of the front portion of the vehicle body floor ahead of the member coupling portion is configured to be greater than the strength of the rear portion of the vehicle body floor behind the front and rear side member coupling portions.
Incidentally, the reason why the strength of the rear part of the vehicle body floor is not increased is to avoid an increase in the weight of the vehicle body by increasing the rear part of the vehicle body floor more than necessary.

As described above, when the battery that has become long due to the increase in capacity is arranged and attached to the lower side of the vehicle body floor, the battery straddles both the front side portion of the vehicle body floor with high strength and the rear side portion of the vehicle body floor with low strength. It will extend in the front-rear direction.
By the way, as in the proposed technique described above, if the vehicle body floor mounting points of the battery are equally arranged on both sides of the battery in the vehicle width direction,
In arranging the vehicle body floor mounting points, no consideration is given to the difference in strength between the front portion of the vehicle body floor and the rear side portion of the vehicle body floor.

For this reason, the battery mounting strength sharing ratio for the low-strength vehicle body floor rear portion may be larger than the battery mounting strength sharing ratio for the high-strength vehicle floor front portion.
In this case, the rear part of the low-strength vehicle body floor is vulnerable to deformation in the vertical direction of the vehicle, making it difficult to ensure the accuracy of the battery mounting surface with respect to the vehicle body floor, and only hinders automating battery installation. Not only that, but also a deformation load is applied to the battery, and the support posture of the battery becomes unstable.

  The present invention makes it easy to ensure the accuracy of the battery mounting surface by making the battery mounting strength share ratio appropriate for the front part of the vehicle body floor and the rear part of the vehicle body floor, thereby eliminating the above-mentioned problems. An object of the present invention is to provide a battery mounting structure for an electric vehicle.

For this purpose, the electric vehicle battery mounting structure according to the present invention constitutes the following.
First, to explain the electric vehicle that is the basic premise of the gist configuration of the present invention,
A vehicle body having left and right front side members and left and right rear side members on both sides in the vehicle width direction, and having left and right side members formed by connecting the left and right front side members of the left and right front side members with the vehicle front and rear direction front ends, respectively. A battery extending in the vehicle front-rear direction across the left and right front side members and the left and right rear side members is attached to the lower side of the floor.

The present invention is characterized in that a battery mounting structure used in such an electric vehicle is particularly configured as follows.
In other words, the front and rear side member coupling portions between the left and right front side members and the left and right rear side members are sandwiched, and the vehicle body floor mounting points of the battery on the front side in the vehicle longitudinal direction with respect to the front and rear side member coupling portions are determined from the front and rear side member coupling portions. Also, the number of attachment points of the vehicle body floor on the rear side in the vehicle longitudinal direction is increased.

  In the battery mounting structure for an electric vehicle according to the present invention, the following effects can be obtained.

That is, by increasing the number of vehicle body floor mounting points of the battery on the front side of the front and rear side member coupling portions than the number of battery body floor mounting points of the battery on the rear side,
The battery mounting strength sharing ratio for the high-strength vehicle body floor front portion is larger than the battery mounting strength sharing ratio for the low-strength vehicle floor rear portion.
For this reason, it becomes easy to ensure the mounting surface accuracy of the battery, the mounting of the battery can be easily automated, and the adverse effect of applying a deformation load to the battery can be eliminated.

It is the perspective view seen from the left front upper direction of the vehicle which shows the example of arrangement | positioning of the battery with respect to the vehicle body of the electric vehicle which can apply the battery attachment structure of this invention. FIG. 2 is a plan view of a battery arrangement example showing the electric vehicle of FIG. FIG. 2 is a side view of a battery arrangement example showing the electric vehicle of FIG. 1 as viewed from the side of the vehicle. FIG. 2 is a perspective view showing a vehicle body floor structure of the electric vehicle shown in FIG. It is a bottom view which shows the electric vehicle provided with the battery attachment structure which becomes one Example of this invention seeing from the vehicle downward direction. FIG. 6 is a perspective view showing battery guide means in the electric vehicle shown in FIG. 5 as seen from below the vehicle body floor. FIG. 7 is a cross-sectional view showing the battery guide means of FIG. 6 taken along the line VII-VII of FIG. FIG. 8 is an exploded perspective view of the battery guide means shown in FIGS. FIG. 6 is an overall perspective view of the screw type locking mechanism in the electric vehicle shown in FIG. FIG. 6 is an overall perspective view of the screw type locking mechanism in the electric vehicle shown in FIG. FIG. 6 is an exploded perspective view of a main part of the screw type lock mechanism, disassembling and showing a lock nut forcible rotation portion of the screw type lock mechanism in the electric vehicle shown in FIG. FIG. 12 is an enlarged detailed exploded perspective view showing the lock nut forcible rotation portion in FIG. 11 in an enlarged manner. FIGS. 9A and 12B are perspective views for explaining a lock nut forced rotation operation when the screw type lock mechanism is locked in FIGS. 9 to 12, wherein (a) shows the screw type lock mechanism in an unlocked position before the lock nut forced rotation. FIG. 4B is a perspective view showing the screw-type lock mechanism in a locked position after forcibly rotating the lock nut. FIGS. 9A and 12B are front views for explaining the lock nut forced rotation operation of the screw type lock mechanism in FIGS. 9 to 12, wherein (a) shows the lock after the screw type lock mechanism is forcedly rotated as in FIG. FIG. 4B is a front view showing the lock nut being stroked in the screwing direction after the screw-type lock mechanism is forcibly rotated with the lock nut. Operation when the lock nut forced rotation member releases the lock nut forced rotation force when the screw type locking mechanism in FIGS. 9 to 12 shifts from the state of FIG. 14 (a) to the state of FIG. (A) is an operation explanatory view showing a state before the lock nut forced rotation member releases the lock nut forced rotation force, and (b) is a lock nut forced rotation member. It is operation | movement explanatory drawing which shows a state when the lock nut forced rotation force is released. FIGS. 9A and 12B are front views for explaining the unlocking operation of the screw type locking mechanism in FIGS. 9 to 12, wherein FIG. It is the front which shows a lock mechanism in the state immediately after a lock release start. FIGS. 9A and 12B are perspective views for explaining a lock nut forced rotation operation when the screw type lock mechanism is unlocked in FIGS. 9 to 12, wherein (a) shows the screw type lock mechanism in a locked position before the lock nut forced rotation; FIG. 5B is a perspective view showing the unlocked position after the screw-type lock mechanism is forcibly rotated with the lock nut. When the screw type locking mechanism in FIGS. 9 to 12 shifts from the state of FIG. 16 (a) to the state of FIG. 16 (b), the lock nut forced rotation member can generate the lock nut forced rotation force. (A) is an operation explanatory diagram showing a state before the lock nut forcible rotation member can generate the lock nut forcible rotation force, (b) These are operation | movement explanatory drawings which show a state when a lock nut forced rotation member comes to be able to generate | occur | produce a lock nut forced rotation force. FIG. 6 is a longitudinal front view showing the connector unit in the electric vehicle shown in FIG. 5 as a cross section in a plane orthogonal to the vehicle body floor tunnel portion. FIG. 20 is a perspective view showing the connector unit shown in FIG. 19 as a cross section taken along the line XX-XX in FIG.

Hereinafter, embodiments of the present invention will be described in detail based on an example shown in the drawings.
<Overall configuration>
1 to 3 show an example of battery arrangement with respect to the body of an electric vehicle to which the battery mounting structure of the present invention can be applied.
FIG. 1 is a perspective view as seen from the upper left front of the vehicle, FIG. 2 is a plan view as seen from above the vehicle, and FIG. 3 is a side view as seen from the left side of the vehicle.
In these drawings, reference numeral 1 denotes an electric vehicle body which is an electric vehicle, and 2 denotes a battery for an electric motor (not shown).

The illustrated electric vehicle is mounted in a motor room in front of the vehicle using the electric motor (not shown) as a power source, and can drive by driving the left and right front wheels 3L and 3R with this electric motor.
In FIGS. 1 to 3, left and right rear wheels as driven wheels are indicated by 4L and 4R, respectively.

An electric vehicle requires a large-capacity and large-sized battery 2 for an electric motor, and this battery 2 is usually configured as one unit by connecting many battery shells to each other.
Therefore, the battery 2 is not only large, but heavy (for example, about 400 kg), and when detachably or permanently attached to the vehicle body 1, a device that avoids the vehicle body's center of gravity becoming high and running unstable, In addition, a device for balancing the vehicle weight in the vehicle width direction is also important for safety.

Therefore, when attaching the large and heavy battery 2 to the vehicle body 1, the battery 2 is disposed below the vehicle body floor 5 as shown in FIGS. It is good to arrange and install so that it may be located in the middle of the width direction.
1 to 3 denotes a vehicle body floor tunnel portion (tunnel member) that extends in the vehicle front-rear direction in the middle of the vehicle body floor 5 in the vehicle width direction.

Hereinafter, the vehicle body floor 5 will be schematically described with reference to FIGS.
FIG. 4 is a perspective view showing the vehicle body floor 5 as viewed from the diagonally upper left side of the vehicle, and FIG. 5 is a bottom view showing the vehicle body floor 5 as seen from below the vehicle with the battery 2 attached to the lower side thereof. FIG.

The vehicle body floor 5 includes a tunnel member 6 that provides a tunnel portion having a middle and high shape that extends in the vehicle longitudinal direction in the middle of the vehicle width direction as clearly shown in FIG.
Left and right front side members 7 and 8 extending in the longitudinal direction of the vehicle so as to be substantially parallel to the tunnel member 6 on both sides in the vehicle width direction as clearly shown in FIGS.
As clearly shown in FIGS. 4 and 5, left and right side sills 9 and 10 extending in the vehicle front-rear direction along the vehicle width direction outside of the left and right front side members 7 and 8,
As clearly shown in FIG. 5, the left and right rear side members 11 are connected to the rear ends of the left and right front side members 7 and 8 via the front and rear side member connecting portions 7a and 8a, respectively, and extend rearward in the vehicle front and rear direction. , 12,
Bridge members 15 and 16 extending in the vehicle width direction so as to connect the tunnel member 6 and the left and right front side members 7 and 8 are provided as main vehicle body floor frame members.

  When assembling the vehicle body floor 5, first, the vehicle body frame members 6-12, 15, 16 are mutually positioned by a vehicle body assembly jig (not shown). In this case, the vehicle body frame members 6-12, 15, A positioning pin corresponding to the vehicle body assembly jig is inserted into a locating hole (indicated by locating holes 7b, 8b of the left and right front side members 7, 8 in FIG. Perform 12, 15, 16 mutual positioning.

Next, the vehicle body skeleton members 6 to 12, 15, and 16 are joined to each other by welding or the like while maintaining the mutual positioning state.
Then, the vehicle body floor 5 is assembled with high accuracy by attaching the front floor panel 13 and the rear floor panel 14 as shown in FIG. 4 so as to close the gaps between the vehicle body floor skeleton members 6 to 12, 15, 16.
In order to realize such a high-precision assembly, the locating holes (indicated by the locating holes 7b and 8b of the left and right front side members 7 and 8 in FIG. 5) that form the reference position during assembly are a pair of Is placed on both sides in the vehicle width direction.

As described above with reference to FIGS. 1 to 3, when the battery 2 is disposed below the vehicle body floor 5 and is mounted so that the center of the battery 2 in the vehicle width direction is located approximately in the middle of the vehicle width direction,
The battery 2 is positioned relative to the vehicle body floor 5 in the front-rear direction as shown in FIG. 5, and as a result, the battery 5 is superior in strength to the vehicle rear side portion, as will be described in detail later. It can be supported by the tunnel member 6, the left and right front side members 7, 8 and the bridging members 15, 16 constituting the front part of the vehicle body, which is advantageous for maintaining the battery mounting accuracy.

As shown in FIG. 5, the battery 2 houses a large number of battery shells (not shown) in a battery frame 2a and is electrically connected to each other to form a single unit, which is sufficient for an electric motor. It is assumed that a large capacity has been realized.
Such a battery 2 is arranged below the vehicle body floor 5 as described above, and in this embodiment, the battery 2 is raised under the vehicle vertical direction guidance by the guide means 21 shown in FIG. 1 to 3 and FIG. 5, the battery 2 is attached to the lower side of the vehicle floor 5 with the screw-type locking mechanism 22 at the lower position. .

On the other hand, the battery 2 needs to be electrically connected to the vehicle body side electrical system such as an electric motor when the vehicle body is mounted, and a connector structure for controlling the electric connection is indispensable.
Therefore, in this embodiment, as shown in FIG. 5, a connector unit 23 is provided which includes a vehicle body side connector member connected to the vehicle body side electrical system and a battery side connector member connected to the battery 2.

In addition, after raising the battery 2 under the vehicle vertical direction guidance by the guide means 21 as described above, when attaching the battery 2 to the lower side of the vehicle body floor 5 with the screw type lock mechanism 22,
The connector unit 23 including the vehicle body side connector member and the battery side connector member is configured and arranged so that the battery side connector member is fitted into the vehicle body side connector member in an electrically connected state during the upward stroke of the battery 2. This is a great advantage in automating the installation of the battery 2.

<Guide means>
The guide means 21 for guiding the battery 2 in the vehicle vertical direction while raising the battery 2 when mounting the vehicle body will be described in detail.
This guide means 21 positions the rising battery 2 at the vehicle longitudinal direction position and the vehicle width direction position aligned with the downward battery storage space on the lower surface of the vehicle body floor 5, as shown in FIGS. It is composed of a locate pin described later.

The guide means 21 composed of such a locating pin or the like is naturally required to be provided as a set of two in light of the installation purpose described above.
If the guide means 21 does not align the battery 2 with the downward battery storage space on the lower surface of the vehicle body floor 5 with high accuracy, the battery 2 will interfere with the opening edge of the battery storage space during the ascending stroke. In this case, the battery 2 cannot be attached.

  In order to align the battery 2 with a downward battery storage space on the lower surface of the vehicle body floor 5 with high accuracy, a set of two battery guide means 21 provided for the purpose is used with high accuracy when the vehicle body floor is assembled. It is necessary to arrange a set of two locating holes (for example, the locating holes for the front side members 7 and 8 shown in FIG. .

The reason is as follows.
As the distance between the battery guide means 21 and the locate hole of the vehicle body floor 5 (for example, the locate holes 7b and 8b of the front side members 7 and 8 shown in FIG. 5) is longer, the vehicle body floor assembly error at the installation location of the battery guide means 21 , The battery guide means 21 has a large relative positional deviation with respect to the vehicle body floor 5, and the alignment accuracy of the battery 2 with respect to the battery storage space decreases accordingly.
However, if the battery guide means 21 is arranged near the vehicle body floor locate hole, the cumulative value of the vehicle body assembly error is small, and the relative displacement of the battery guide means 21 with respect to the vehicle body floor 5 is also small. The alignment accuracy of is increased.

For this reason, the set of two battery guide means 21 is close to the set of two vehicle body floor locate holes 7b, 8b on both sides in the vehicle width direction of the front portion of the vehicle body, which was the high-precision reference position when the vehicle body floor was assembled. If placed in
A set of two battery guide means 21 can align the battery 2 with high accuracy with the downward battery storage space on the lower surface of the vehicle body floor 5,
It is possible to avoid the disadvantage that the battery 2 interferes with the opening edge of the battery housing space during the ascending stroke.

In this embodiment, when two battery guide means 21 are arranged in the vicinity of the locating holes 7b, 8b of the pair of vehicle body floors 5 in the same manner,
Since these locate holes 7b, 8b are located on both sides in the vehicle width direction at the front side portion of the vehicle body floor 5, the battery guide means 21 are installed on both sides in the vehicle width direction near the front end of the battery 2 as shown in FIG. To do.

Each of the battery guide means 21 arranged in this way is constituted by a locating pin having a structure clearly shown in FIGS.
That is, the locate pin main body 25 is provided on the battery frame 2 a of the battery 2 via the bracket 24, and the locate pin main body 25 is protruded upward from the bracket 24.
A locating sleeve 26 into which the locating pin body 25 penetrates is provided on the front side member 7 (8) while the battery 2 is raised.

According to the battery guide means 21, while the battery 2 is raised, the locate pin body 25 provided on the battery 2 penetrates into the locate sleeve 26 provided on the front side member 7 (8) as shown in FIGS. The battery 2 inside is restrained in the vehicle front-rear direction and the vehicle width direction.
Therefore, the guide means 21 guides the battery 2 in the vertical direction of the vehicle in a state where the battery 2 is accurately aligned with the downward battery storage space on the lower surface of the vehicle body floor 5, and the battery 2 opens the battery storage space during the upward stroke. The inconvenience of interfering with the edge can be avoided.

Further, in the present embodiment, as shown in FIG. 5, the battery guide means 21 is provided on both sides in the vehicle width direction at a location close to the front end of the battery 2, so that the vehicle body that was the high-precision reference position when the vehicle body floor 5 was assembled. Because it is located close to the locate holes 7b, 8b on the front side of the floor,
The battery 2 can be more accurately aligned with the downward battery storage space on the lower surface of the vehicle body floor 5, and the above-described effects can be further enhanced.

<Configuration of screw type locking mechanism>
In order to lock and attach the battery 2 raised to the mounting position below the vehicle body floor 5 as shown in FIGS. 1 to 3 and FIG. 5 under the guidance of the locate pin type battery guide means 21 to the lower side of the vehicle body floor 5 The screw type locking mechanism 22 will be described in detail below.

  In the present embodiment, the screw type locking mechanism 22 in this embodiment is shown in FIG. 5 in which the left front / rear side member connecting portion 7a between the left front side member 7 and the left rear side member 11 and the right front side member 8 and the right rear side member 12 are combined. 6 on the front side in the vehicle front-rear direction with respect to the right front-rear side member coupling portion 8a and two on the rear side in the vehicle front-rear direction on the left and right side member coupling portions 7a, 8a.

Six screw type locking mechanisms 22 on the front side are arranged in two on each side in the vehicle width direction on the front side of the battery 2 (battery frame 2a), and both sides in the vehicle width direction on the front side of the battery 2 Is attached to the front side members 7 and 8,
The remaining two are arranged at the front end in the vehicle longitudinal direction of the battery 2 (battery frame 2a) so as to be separated from each other in the vehicle width direction, and the front end of the battery 2 is a bridging member between the front side members 7 and 8 and the tunnel member 6. Attach to 15,16.
The two screw-type locking mechanisms 22 on the rear side are respectively arranged on both sides in the vehicle width direction on the rear side in the vehicle longitudinal direction of the battery 2 (battery frame 2a), and the both sides in the vehicle width direction on the rear side of the battery 2 are rear side members. Attach to 11,12.

  Here, many (six) screw-type locking mechanisms 22 are arranged in front of the left and right front / rear side member coupling portions 7a and 8a, and fewer (two) are arranged behind the left and right front / rear side member coupling portions 7a and 8a. Explain why.

When the battery 2 is attached to the lower side of the vehicle body floor 5 as in the present embodiment, the thickness of the battery 2 (the vehicle vertical dimension) cannot be made too large due to the secured space in the same direction. In addition, since the size of the battery 2 in the vehicle width direction (the width of the battery 2) cannot be allowed to protrude beyond the vehicle width,
If the capacity of the battery 2 is increased so as to satisfy the requirements of the electric vehicle, the size of the battery 2 in the vehicle front-rear direction (the length of the battery 2) inevitably increases.

  As shown in FIG. 5, when the battery 2 that has become longer due to the increase in capacity is arranged and attached to the lower side of the vehicle body floor 5, the battery 2 is connected to the left front side member 7 and the left rear side member 11 as shown in FIG. It extends in the vehicle front-rear direction across both the left front-rear side member coupling portion 7a and the right front-rear side member coupling portion 8a between the right front side member 8 and the right rear side member 12. Become.

  By the way, the front part of the vehicle body floor 5 in front of the left and right front / rear side member coupling portions 7a and 8a is provided with sufficient strength to meet the purpose of occupant protection. The rear part of the vehicle body floor 5 behind the front and rear side member coupling portions 7a, 8a is not required to be as strong as the vehicle body floor front part, so it has a lower strength than the vehicle body floor front part in order to reduce the vehicle weight. Has been.

As in the past, the attachment points of the battery 2 to the vehicle body floor 5 are equally arranged on both sides in the vehicle width direction of the battery 2 without considering the difference in strength between the vehicle body floor front side portion and the vehicle body floor rear side portion. So,
The attachment strength sharing ratio of the battery 2 with respect to the low-strength vehicle body floor rear portion may be the same as or larger than the attachment strength distribution ratio of the battery 2 with respect to the high-strength vehicle floor front portion.

Thus, when the attachment strength sharing ratio of the battery 2 to the rear part of the low-strength vehicle floor becomes equal to or more than the attachment strength sharing ratio of the battery 2 to the front part of the high-strength vehicle floor,
Since the rear part of the low-strength vehicle floor is vulnerable to deformation in the vertical direction of the vehicle, it is difficult to ensure the accuracy of the mounting surface of the battery 2 with respect to the vehicle floor 5, and only hinders automating the mounting of the battery 2 Not only that, but also a deformation load is applied to the battery 2 and the support posture of the battery 2 becomes unstable.

  Therefore, in the present embodiment, the attachment strength of the battery 2 is shared more by the front side portion of the high-strength vehicle body floor 5 than by the low-strength vehicle body floor rear side portion. It is easy to secure the mounting surface accuracy, so that the mounting of the battery 2 can be easily automated, and problems such as deformation load applied to the battery 2 and the support posture of the battery 2 become unstable Make sure there is no.

Therefore, in the present embodiment, as described above with reference to FIG. 5, the screw type lock mechanism 22 that controls the attachment of the battery 2 to the vehicle body floor 5 is arranged in a larger number (six) in front of the left and right front and rear side member coupling portions 7a and 8a. The left and right front / rear side member coupling portions 7a and 8a are disposed behind (less than two).
Thus, the battery 2 is attached to the front part of the high-strength vehicle body floor 5 with the six screw type locking mechanisms 22 in front of the left and right front and rear side member joints 7a and 8a, and the left and right front and rear side member joints 7a and 8a. Two screw type locking mechanisms 22 at the rear are attached to the rear portion of the low-strength vehicle body floor 5.

Since the eight screw-type lock mechanisms 22 have the same configuration, the detailed structure of the screw-type lock mechanisms 22 arranged on both sides in the vehicle width direction at the front end of the battery 2 (battery frame 2a) will be described below. .
FIGS. 9 and 10 show the overall structure of the screw type locking mechanism 22, FIG. 9 shows the screw type locking mechanism 22 in the unlocked state, and FIG. 10 shows the screw type locking mechanism 22 in the locked state. Show.
11 and 12 are exploded perspective views showing the main part of the screw type locking mechanism 22 shown in FIGS.

The screw-type lock mechanism 22 shown in FIGS. 9 and 10 is attached to and detached from the lower mounting position of the vehicle body floor 5 by cooperating with the lock plate 27 fixed to the vehicle body floor 5 (front side members 7 and 8). It can be freely locked,
Therefore, the lock plate 27 is provided with a rectangular opening 27a, and a circular opening 27b is provided at the center thereof.
When fixing the lock plate 27 to the vehicle body floor 5, the lock plate 27 is attached to the corresponding front side member 7 (8) by tightening means such as bolts inserted into the corner holes 27c at the four corners of the lock plate 27. To wear.

The screw type lock mechanism 22 includes a lock base 31 attached to the battery 2 (battery frame 2a), a bolt 32 attached to the lock base 31, and a lock nut 33 screwed to the lock base 31 as main components.
The bolt 32 is rotatably inserted into the lock base 31 and is prevented from coming off upward in FIGS. 9 to 11 by a bolt head (not shown) integrally formed at the lower end of the bolt 32 in FIGS.

As described above, the bolt 32, which is prevented from coming off from the lock base 31 and is rotatably provided, is provided with a lock nut 33 screwed onto the end opposite to the above-mentioned end from which the retaining is provided.
The lock nut 33 is a nut having a square cross section such as a rectangle when viewed in the screwing direction, and has a female screw for screwing into the bolt 32 at the center.

  As shown in FIGS. 9 to 11, the central circular boss portion 31a of the lock base 31 has an unlocked position, which is a loosening direction restricting position shown in FIG. Two stoppers 31b and 31c are provided to be restricted between the lock positions which are tightening direction restriction positions.

Of the rectangular hole 27a and the circular hole 27b provided in the lock plate 27, the former rectangular hole 27a accurately passes the lock nut 33 in the unlock position shown in FIG. 9 in all directions orthogonal to the passing direction. The latter circular hole 27b is allowed to be fitted in the center circular boss portion 31a provided in the lock base 31.
However, the diameter of the circular hole 27b is set to a size that does not allow passage of the lock nut 33 at the lock position shown in FIGS.

The lock nut 33 has a taper surface 33a formed by chamfering the long side corner at the tip in the insertion passage direction, and a taper surface 33b formed by chamfering the short side corner.
These tapered surfaces 33a and 33b function as follows.

That is, as described above, the battery guide means 21 positions the battery 2 in the lateral direction during the ascending stroke and aligns the battery 2 with the battery storage space. However, the vehicle body side connector constituting the connector unit 23 only by this alignment. The fitting portions of the member and the battery-side connector member cannot be correctly aligned with each other.
If there is such a misalignment, not only will the cross fitting direction of both connector members be subjected to a lateral load across the fitting direction to reduce the durability of the connector unit 23, but also the mutual fitting portion of the connector member. This causes a gap in part and causes a spark.

  By the way, in this embodiment, when trying to pass the lock nut 33 through the rectangular hole 27a of the lock plate 27 in the insertion direction, the tapered surfaces 33a and 33b of the lock nut 33 abut against the opening edge of the rectangular hole 27a. By cooperating with the opening edge of the rectangular hole 27a, the lock nut 33 is fitted into the rectangular hole 27a while being guided into the rectangular hole 27a of the lock plate 27.

At this time, since the lock nut 33 is closely fitted into the rectangular hole 27a of the lock plate 27 without a gap, the battery 2 connector member of the connector unit 23 is accurately centered with respect to the vehicle body side connector member. Can be positioned to be
There is no lateral load acting in the direction crossing the fitting direction on the mutual fitting portions of both connector members, the durability of the connector unit 23 is reduced, or there is a gap in the mutual fitting portions of the connector members. The problem of occurrence of sparks can be avoided.

Therefore, the taper surfaces 33a and 33b of the lock nut 33 and the rectangular hole 27a (the opening edge thereof) of the lock plate 27 that cooperates with each other allow the battery side connector member and the vehicle body side connector member of the connector unit 23 to mutually For positioning the battery 2 in the horizontal direction with respect to the vehicle body floor 5 so as to be centered,
As a result, a connector member centering means for centering between the battery side connector member and the vehicle body side connector member of the connector unit 23 is configured.

  Next, referring also to FIGS. 11 and 12, the lock nut 33 is forcibly rotated in the same direction when the bolt 32 is rotated in the tightening direction (in this embodiment, a right-hand thread) and when the bolt 32 is rotated in the loose direction. The lock nut rotation mechanism for rotating the tightening direction restriction position (lock position) shown in FIGS. 10 and 11 and the relaxation direction restriction position (unlock position) shown in FIG. 9 will be described in detail.

As clearly shown in FIGS. 11 and 12, a plurality of axial grooves 32a are formed at equal intervals in the circumferential direction on the outer periphery of the tip of the bolt 32 into which the lock nut 33 is screwed, so that the tip of the bolt 32 has a non-circular cross section. Shape and sushi.
A lock nut forcibly turning member 34 is provided at the tip of the bolt 32 as shown in FIGS.

The lock nut forcibly rotating member 34 is composed of a plate-like member 34a and two leg portions 34b formed integrally therewith.
By drilling a non-circular hole 34d corresponding to the above-mentioned non-circular cross-sectional shape of the tip of the bolt 32 in the center of the plate-like member 34a, and slidably fitting the non-circular hole 34d to the tip of the bolt 32, A lock nut forcibly rotating member 34 is rotatably engaged with the tip of the bolt 32 so as to be slidable in the axial direction.

The lock nut forcibly rotating member 34 is urged toward the lock nut 33 by elastic means such as a spring 35 loosely fitted to the tip of the bolt 32. Therefore, the end of the spring 35 far from the lock nut forcibly rotating member 34 is A spring seat 36 on which the part is seated is provided to be engaged with the tip of the bolt 32.
Each of the legs 34b of the lock nut forcibly rotating member 34 urged toward the lock nut 33 by an elastic means such as a spring 35 cooperates with the long side taper surface 33a of the lock nut 33 as follows. The flat cam surface 34c that causes the action is set.

The lock nut forcibly rotating member side flat cam surface 34c is formed by the lock nut forcibly rotating member 34 that rotates together with the bolt 32 when the bolt 32 rotates. By being pressed, the lock nut 33 is tilted so that it can be rotated, but the tilt angle is set such that the following actions are possible.
That is, after the lock nut 33 is restrained to the corresponding direction restriction position by the stopper 31b or 31c, the lock nut forced-turning member 34 gets over the lock nut long side taper surface 33a on the flat cam surface 34c, and this The flat cam on the lock nut forced-rotation member side so that the spring 35 is compressed and the stroke is moved away from the lock nut 33 and the lock nut 33 is rotated relative to the lock nut 33 to release the lock nut rotation force. The inclination angle of the surface 34c is determined.

The stroke limit position of the lock nut forcibly rotating member 34 urged toward the lock nut 33 by elastic means such as a spring 35 is defined by the length of the axial groove 32a provided on the outer periphery of the tip of the bolt 32.
When determining the length of the axial groove 32a, immediately after the lock nut 33 is brought into the locked position shown in FIGS. The axial limit groove 32a so that the lock nut 33 moves away from the leg 34b of the lock nut forced-turning member 34 when the lock nut 33 further strokes in the tightening direction when the stroke reaches the stroke limit position. To decide.

<Operation of screw type locking mechanism>
The screw-type lock mechanism 22 having the above-described configuration has the lock base 31 attached to the battery 2 (battery frame 2a) as described above and provided on the battery 2 side, and the lock plate 27 is attached to the vehicle body floor 5. Practical use by providing on the vehicle body side,
When the battery 2 is detachably stored and locked in a battery storage space with a downward opening on the lower side of the vehicle body floor 5, the screw type locking mechanism 22 cooperates with the lock plate 27 to perform the locking function as follows. Fulfill.

First, the locking action when the battery is attached will be described with reference to FIGS.
When the battery 2 is attached, the lock nut 33 is rotated by the lock nut rotating member 34 as described in detail later by the rotation of the bolt 32 in the loosening direction indicated by the arrow in FIG. 31b is the relaxing direction restriction position (unlock position) shown in FIG. 9 and FIG. 13 (a).

  Here, when the battery 2 is lifted into the battery storage space with the downward opening on the lower surface of the vehicle body floor 5, the lock nut 33 is moved into the lock plate rectangular hole by the cooperation of the tapered surfaces 33a and 33b and the lock plate rectangular hole 27a. While being centered with respect to 27a, it passes through the lock plate rectangular hole 27a as shown in FIGS. 9 and 13 (a), and the central circular boss portion 31a of the lock base 31 is recessed into the lock plate circular hole 27b. The lock nut 33 is positioned in the battery storage space, and the lock base 31 is seated on the externally exposed lower surface of the lock plate 27.

In this state, when the bolt 32 is rotated in the tightening direction indicated by the arrow in FIG. 13 (b) with a nut runner or the like, the lock nut forcibly rotating member 34 that rotates together with the bolt 32 is locked via the flat cam surface 34c and the tapered surface 33a. The nut 33 is rotated and the lock nut 33 is brought into contact with the stopper 31c to be in the tightening direction restricting position (lock position) shown in FIGS. 10, 13 (b) and 14 (a).
However, the lock nut 33 is not rotated by the lock nut forced rotation member 34 beyond the tightening direction limit position (lock position), and is shown in FIGS. 10, 13 (b) and 14 (a). Thus, it stops at the rotation position.

  By the way, as shown in FIG. 15 (b) from the state of FIG. 15 (a), the lock nut forcibly turning member 34 is over the lock nut long side taper surface 33a against the spring 35 on the flat cam surface 34c, In addition, the spring 35 is compressed as it goes over and strokes in a direction away from the lock nut 33, so that it can rotate relative to the lock nut 33 and release the lock nut turning force.

For this reason, the bolt 32 is not prevented from further rotation in the tightening direction even by the presence of the lock nut forcedly rotating member 34.
When the bolt 32 is further rotated in the tightening direction, as shown in FIG. 14 (b), the lock nut 33 is screwed in the direction indicated by the arrow while maintaining the tightening direction restricting position (locking position). The stroke moves in a direction approaching the lock base 31 while leaving the position where the lock nut forcedly rotating member 34 (leg 34b) is located.
As a result, the lock nut 33 and the lock base 31 can hold the lock plate 27 therebetween to lock and hold the battery 2 at a position where it is stored in the battery storage space.

Next, the unlocking action when removing the battery will be described with reference to FIGS.
When unlocking to take out the battery 2 from the battery storage space, the bolt 32 is rotated in the loosening direction indicated by the arrow in FIG.

  Initially, as shown in FIG. 16 (a), the lock nut 33 is in the same locking screwing stroke position as in FIG. 14 (b), and is separated from the lock nut forcibly turning member 34 (leg 34b) at the lower limit position. Therefore, the lock nut forcibly rotating member 34 rotated in the loosening direction together with the bolt 32 can rotate relative to the lock nut 33 in the same direction, and does not prevent the bolt 32 from rotating in the loosening direction.

Such rotation of the bolt 32 in the loosening direction causes the lock nut 33 to stroke in the loosening direction indicated by the arrows in FIGS. 16 (b) and 17 (b), and immediately, as shown in FIG. 18 (a), the lock nut in the lower limit position. It is made to contact with the forced rotation member 34 (leg part 34b).
However, in the contact state shown in FIG. 18 (a), the lock nut forced rotation member 34 (leg 34b) is still on the rear end surface of the lock nut 33 in the screwing direction, and the lock nut rotation force cannot be generated. Therefore, the lock nut forcibly turning member 34 (leg part 34b) rotates relative to the lock nut 33 in the loosening direction together with the bolt 32.

As a result of such relative rotation, the lock nut forcibly rotating member 34 becomes a rotational position where the flat cam surface 34c of the leg 34b faces the lock nut long side taper surface 33a, as shown in FIG. 18 (b).
At this time, the spring 35 urges the lock nut forced-turning member 34 in the direction of the arrow in FIG. 18B, and the lock nut forced-turn member 34 has a flat cam surface 34c whose lock nut long side tapered surface 33a. Stroke position opposite to.
As described above, as shown in FIGS. 16 (b) and 17 (a), the lock nut 33 and the lock nut forcibly rotating member 34 that remain in the same tightening direction restricting position as that at the time of locking include the tapered surface 33a and the flat cam surface. Rotating engagement is achieved by the co-operation of 34c.

When the bolt 32 is further rotated in the loosening direction in this state, the lock nut forcibly rotating member 34 that rotates together with the bolt 32 rotates the lock nut 33 through the flat cam surface 34c and the tapered surface 33a, and the lock nut 33 is rotated. As shown in FIG. 17 (b), it is forcibly rotated to a relaxing direction limit position (unlock position) that contacts the stopper 31b.
However, the lock nut 33 is not rotated by the lock nut forced rotation member 34 beyond the loosening direction restriction position (unlock position), and stops at the rotation position as shown in FIG. 17 (b).

  By the way, the lock nut forcibly rotating member 34, as shown in FIG.18 (b) from the state of FIG. 18 (b), overcoming the spring 35 on the flat cam surface 34c and overcoming the lock nut long side taper surface 33a, In addition, the spring 35 is compressed as it goes over and strokes in a direction away from the lock nut 33, so that the spring 35 can rotate relative to the lock nut 33, and the lock nut rotation force can be released.

For this reason, the bolt 32 is not prevented from further rotating in the loosening direction even by the presence of the lock nut forcibly rotating member 34.
When the bolt 32 is further rotated in the loosening direction, the lock nut 33 maintains the loosening direction restriction position (unlock position) in FIG. 17 (b) and performs a loosening stroke in the direction of the arrow in FIG. While moving the lock nut forcedly rotating member 34 (leg 34b) in the same direction, the stroke is moved away from the lock base 31.

  As a result, the clamping pressure (locking) of the lock plate 27 by the lock nut 33 and the lock base 31 is released, and the lock nut 33 passes through the rectangular hole 27a of the lock plate 27 and the central circular boss portion 31a of the lock base 31 The battery 2 can be removed from the battery storage space while the battery 2 is removed from the circular hole 27b of the lock plate 27.

<Connector unit>
The battery 2 must have a connector structure for controlling electrical connection with the vehicle body side electrical system. Therefore, in this embodiment, the connector unit 23 is provided as described above with reference to FIG.
19 and 20, the connector unit 23 includes a vehicle body side connector member 41 connected to the vehicle body side electrical system and a battery side connector member 42 connected to the battery 2.

By the way, as in this embodiment, the battery 2 is raised to the mounting position on the lower side of the vehicle body floor 5 as shown in FIGS. 1 to 3 and 5 under the guidance of the locate pin type battery guide means 21 described above. When the battery 2 is locked and installed in the battery storage space on the lower side of the vehicle body floor 5 by the screw type locking mechanism 22 described above,
The connector unit 23 comprising the vehicle body side connector member 41 and the battery side connector member 42 is configured such that the battery side connector member 42 is fitted in the vehicle body side connector member 41 in an electrically connected state during the rising stroke of the battery 2. Arrangement is very advantageous in automating the attachment of the battery 2, and in this embodiment, the connector unit 23 is configured in such a manner as will be described later with reference to FIGS.

Thus, when the connector unit 23 is far from both of the battery guide means 21 (see FIG. 5), the connector unit 23 is far from only one of the battery guide means 23. even when,
Due to the accumulation of the vehicle body assembly error described above, a relative positional shift between the battery side connector member 42 forming the connector unit 23 and the vehicle body side connector member 41 occurs, and the battery side connector member 42 and the vehicle body side connector member 41 are mutually offset. Misalignment occurs in the fitting part.

  Such misalignment between the battery side connector member 42 and the vehicle body side connector member 41 applies a lateral load in a direction crossing the fitting direction to the mutual fitting portion of both the connector members 41, 42, thereby improving the durability of the connector unit 23. In addition to lowering, a gap is partially generated in the mutual fitting portion of the connector members 41 and 42, which causes a spark.

  Therefore, in this embodiment, the connector unit 23 constituted by the battery side connector member 42 and the vehicle body side connector member 41 is provided on both of the battery guide means 21 provided on both sides in the vehicle width direction of the battery 2 as shown in FIG. They are arranged at positions close to each other, that is, at an intermediate position equidistant from these battery guide means 21.

The connector unit 23 having such an arrangement is close to both the battery guide means 21, and the positions of the vehicle body side connector member 41 and the battery side connector member 42 are highly accurate with the influence of accumulation of vehicle body assembly errors being minimized.
Therefore, it is possible to eliminate the misalignment at the mutual fitting portions of these connector members 41 and 42, and the mutual fitting portions of both connector members 41 and 42 are not subjected to a lateral load across the fitting direction. In addition, it is possible to solve the problem that the durability of the connector unit 23 is reduced, or that a gap is partially generated in the mutual fitting portion of the connector members 41 and 42 to generate sparks.

In light of the above, the connector unit 23 is disposed in the middle of the vehicle body floor 5 in the vehicle width direction.
By the way, in the middle of the vehicle body floor 5 in the vehicle width direction, a tunnel member 6 is provided for securing the strength of the vehicle body floor 5 and for wiring the wiring harness of the vehicle body side electrical system. Shaped tunnel part is set.
Therefore, in this embodiment, the connector unit 23 is placed in a medium-high shape tunnel member 6 (tunnel portion) extending in the vehicle front-rear direction in the middle of the vehicle body floor 5 in the vehicle width direction as shown in FIGS. Deploy.

  In this arrangement, as clearly shown in FIG. 5, a connector is provided in the tunnel member 6 (tunnel portion) where the tunnel member 6 (tunnel portion) of the vehicle body floor 5 and the front end surface of the battery 2 (battery frame 2a) intersect. Unit 23 should be placed.

  19 and 20, of the vehicle body side connector member 41 and the battery side connector member 42 constituting the connector unit 23, the vehicle body side connector member 41 is the tunnel member 6 (tunnel portion) of the vehicle body floor 5 at the above-mentioned location. The battery-side connector member 42 is attached to the front end face of the battery 2 (battery frame 2a) via the bracket 44 at the above-described location.

Of course, the vehicle body side connector member 41 and the battery side connector member 42 are installed at positions so as to be fitted to each other in an electrically connected state during the upward stroke of the battery 2 (preferably at the end of the upward stroke). But,
After the battery 2 is mounted by the screw type locking mechanism 22, the vehicle body side connector member 41 and the battery side connector member 42 are mounted so that the battery side connector member 42 on the lower side does not protrude downward from the tunnel member 6 (tunnel portion). It is good to decide the level.

<Effect of Example>
According to the above-described battery mounting structure of the present embodiment, the screw type locking mechanism 22 for locking and mounting the battery 2 to the lower side of the vehicle body floor 5 is provided with the left and right front and rear side member coupling portions 7a and The front and rear side member joints 8a are provided in front of the front and rear direction of the vehicle in six, and the left and right front and rear side member joints 7a and 8a are provided in the rear of the vehicle in the front and rear direction of two, respectively. Since the number of attachment points (6 pieces) of the battery 2 in front of the front side 8a is greater than the number of attachment points (2 pieces) of the vehicle body 2 in the rear side of the front and rear side member coupling portions 7a, 8a, the following effects can be obtained. It is done.

That is, according to the above configuration, the mounting strength of the battery 2 with respect to the vehicle body floor 5 is greater than the front and rear side member coupling portions 7a and 8a rather than the lower strength vehicle body floor rear portion behind the front and rear side member coupling portions 7a and 8a. A large amount is shared by the front side portion of the front high-strength vehicle body floor 5.
The front-and-rear part of the high-strength vehicle body floor 5 can increase the accuracy of the mounting surface of the battery 2 with respect to the vehicle body floor 5, and the battery 2 can be easily attached by this high mounting surface accuracy. In addition to being able to be automated, problems such as a deformation load applied to the battery 2 and an unstable support posture of the battery 2 can be avoided.

Of the six screw-type lock mechanisms 22 on the front side, two screw-type lock mechanisms 22 arranged on both sides in the vehicle width direction on the front side of the battery 2 (battery frame 2a), the vehicle width on the front side of the battery 2 Since both sides are attached to the corresponding front side members 7 and 8,
This attachment becomes attachment to the sturdy front side members 7 and 8 which are the skeleton members of the vehicle body floor 5, and the above-mentioned effects can be made more remarkable.

Further, of the six screw-type lock mechanisms 22 on the front side, the remaining two are arranged at the front end in the vehicle front-rear direction of the battery 2 (battery frame 2a) so as to be spaced apart from each other in the vehicle width direction. Since it is attached to the bridging members 15 and 16 between the front side members 7 and 8 and the tunnel member 6, the following effects can be obtained.
In other words, the two screw-type locking mechanisms 22 at the front end of the battery 2 are constituted by four screw-type locking mechanisms 22 arranged on the both sides in the vehicle width direction of the front portion of the battery 2 (battery frame 2a). This function functions to further increase the share of the attachment strength of the battery 2 to the front part of the vehicle body floor with a high strength by assisting the attachment strength to the front part of the vehicle body floor. .

  And the attachment by the two screw type lock mechanisms 22 at the front end of the battery 2 is also attached to the bridging members 15 and 16 between the sturdy front side members 7 and 8 and the tunnel member 6 which are the frame members of the vehicle body floor 5. And the said effect can be made more remarkable.

<Other examples>
In the illustrated embodiment, the number of attachment points of the vehicle body floor of the battery 2 by the screw-type lock mechanism 22 is eight in total, six ahead of the front and rear side member joints 7a and 8a, and the front and rear side member joints 7a and 8a. However, the total number of attachment points of the vehicle body floor of the battery 2 by the screw type locking mechanism 22 may be arbitrary. In short, the battery 2 in front of the front and rear side member coupling portions 7a, 8a is important. If the number of vehicle body floor attachment points is greater than the number of vehicle body floor attachment points of the battery 2 behind the front and rear side member coupling portions 7a and 8a, the above-described effects can be achieved.

Also, in the illustrated example, screw type locking mechanisms 22 are provided on both sides of the front portion of the battery 2 in the vehicle width direction, the vehicle body floor mounting points of the battery 2 are set here, and the screw type locking mechanism 22 is provided at the front end of the battery 2. I set up a car body floor mounting point for battery 2 here,
It is not always necessary to provide screw type locking mechanisms 22 on both sides of the front part of the battery 2 in the vehicle width direction and on the front end of the battery 2. Considering the mounting strength requirement of the battery 2, the screw type lock is applied to only one of them. It is also possible to set a vehicle body floor attachment point of the battery 2 by providing a mechanism 22.

Further, in the illustrated example, the battery 2 is described in the case where the battery 2 is configured by connecting a large number of battery shells to one unit.
Needless to say, even if the battery 2 is of any type such as what is referred to as a battery module, the above-described idea of the present invention can be applied to achieve the same effect.

1 body
2 Battery
2a battery frame
3L, 3R Left and right front wheels (drive wheels)
4L, 4R left and right rear wheels
5 Body floor
6 Tunnel member
7,8 Left and right front side members
7a, 8a Front / rear side member joint
7b, 8b Locate hall
9,10 Left and right side sills
11,12 Left and right rear side members
13 Front floor panel
14 Rear floor panel
15,16 Bridge members
21 Battery guide means
22 Screw type locking mechanism
23 Connector unit
24 Bracket
25 Locate pin body
26 Locate sleeve
27 Lock plate
27a Rectangular opening
27b Circular opening
31 Lock base
31b, 31c stopper
32 volts
33 Lock nut
33a Lock nut long side taper surface
33b Lock nut short side taper surface
34 Lock nut forced rotation member
34a Plate member
34b Leg
34c Flat cam surface
35 Spring
36 Spring seat
41 Car body side connector member
42 Battery side connector
43,44 bracket

Claims (4)

A vehicle body having left and right front side members and left and right rear side members on both sides in the vehicle width direction, and having left and right side members formed by connecting the left and right front side members of the left and right front side members with the vehicle front and rear direction front ends, respectively. In the electric vehicle in which a battery extending in the vehicle front-rear direction across the left and right front side members and the left and right rear side members is attached to the lower side of the floor,
The vehicle body floor mounting points on the front side in the vehicle front-rear direction with respect to the front-rear side member coupling portion across the front-rear side member coupling portion between the left and right front side members and the left and right rear side members are An attachment structure for a battery for an electric vehicle, wherein the number of attachment points of the vehicle body floor on the rear side in the front-rear direction is increased. In the battery mounting structure for an electric vehicle according to claim 1,
A battery mounting structure for an electric vehicle, wherein the battery is mounted on a front side member and a rear side member on the corresponding side at vehicle body floor mounting points on both sides of the battery in the vehicle width direction. In the mounting structure of the battery for an electric vehicle according to claim 1 or 2,
A battery mounting structure for an electric vehicle characterized in that at least one mounting point of the battery body floor mounting points on the front side in the vehicle front-rear direction than the front-rear side member coupling portion is disposed at the front end in the vehicle front-rear direction of the battery. . Between the left and right front side members, a tunnel member extending in the vehicle front-rear direction in the middle of the vehicle width direction is provided, and the tunnel member is interposed between the tunnel member and the left and right front side members, respectively. In the battery mounting structure for an electric vehicle according to claim 3, wherein the tunnel member is also used as a vehicle body floor skeleton member by being coupled to the left and right front side members.
The at least one attachment point disposed at the front end of the battery in the vehicle longitudinal direction is defined as two attachment points,
At these two attachment points, the battery mounting structure for an electric vehicle is characterized in that the battery is attached to the left and right bridging members on the corresponding side.

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