KR101293643B1 - Battery Module Employed with Patch Plate - Google Patents

Abstract

The present invention is a medium-large battery module having a structure including a secondary battery itself or a unit module containing two or more secondary batteries, the unit modules are mounted on a base plate (base plate) And a base plate on which the unit modules are mounted, a side portion of a structure bent downward along the outer circumferential surface of the unit module, and the side plate for fixing the base plate to the battery module mounting portion. It consists of a structure comprising two or more fastening portions protruding from the at least one of the fastening portion of the fastening portion to prevent deformation due to vertical vibration and to improve the mechanical rigidity, the upper surface of the fastening portion and the corresponding base plate An additional patch plate is placed around the sides and top of the Provided that the battery module.

Description

Battery Module with Patch Plate {Battery Module Employed with Patch Plate}

The present invention relates to a battery module having a stable mounting structure, and more particularly, to a medium-large battery module having a structure including unit modules in which secondary batteries themselves or two or more secondary batteries are built in. mounted on a predetermined part of the device ("battery module mounting part") in a state where it is mounted on a base plate, and the base plate has a structure including an upper surface part, a side part, and fastening parts, and fastening at least one of the fastening parts. The part relates to a battery module which is further provided with a patch plate surrounding the upper surface of the fastening portion and the side and upper portions of the base plate corresponding to the fastening portion to prevent deformation due to vertical vibration and to improve mechanical rigidity. .

One of the biggest problems with vehicles using fossil fuels such as gasoline and diesel is that they cause air pollution. As a solution to this problem, a technique of using a power source of a vehicle as a secondary battery capable of charging and discharging has attracted attention. Accordingly, an electric vehicle (EV) that can be operated only by a battery, and a hybrid electric vehicle (HEV) that uses a battery and an existing engine have been developed, and some of them have been commercialized. BACKGROUND ART [0002] Nickel metal hydride (Ni-MH) batteries are mainly used as secondary batteries as power sources for EVs, HEVs and the like. Recently, however, use of lithium ion batteries has also been attempted.

In order to use the secondary battery as a power source such as EV and HEV, a high output large capacity is required. For this purpose, a plurality of small secondary batteries (unit cells) are connected in series, or in some cases, a battery module connected in series and in parallel. To form.

In general, such a battery module is a structure for protecting the unit modules in which secondary batteries are built, and has various forms depending on the type of the target vehicle or the mounting position of the vehicle. Among them, a structure for effectively fixing a large capacity unit module is a structure based on a base plate, a supporting bar, and an end plate. Such a structure has an advantage that the base plate has a fastening position with the vehicle, and thus the stability of the entire battery module is excellent. However, when the fastening position of the base plate is not sufficient, deformation is largely caused in the up and down direction of vibration.

In order to solve this problem, a method of increasing the thickness of the base plate may be considered, but this method has a problem of increasing cost and weight.

Therefore, as a solution to the above problem, a structure in which the patch plate is additionally mounted only at the fastening portion is used so as not to increase the thickness of the base plate. 1 to 3, the patch plate 60 is mounted by welding on the side portion 24 and the fastening portion 22 of the base plate 20, and the welding points 62. , 64 are located on the upper surface 68 and the side surface 66 of the patch plate 60, respectively.

However, as the inventors of the present application have confirmed through experiments, such a structure has a resistance to bending at the side of the patch plate 60 when the vibration load in the up and down direction is generated, and the loads are also provided through the welding point 62 at the side. As a result, buckling occurs on the side face 66 of the patch plate 60, and sufficient rigidity reinforcement is not achieved, and a shear load is applied to the side weld point 62 and the periphery of the weld point 62 and the weld point 62. Sites have a problem that is vulnerable to shear load.

For reference, buckling means that when the length of the column is larger than the dimension of the cross section, when compressive load is applied to both ends of the column, the column suddenly bends when the load reaches a certain size, where shear load is It refers to a load that cuts an object by applying a pair of forces parallel to the cross section in parallel.

In addition, when the battery module is mounted in the trunk of the vehicle, since a part of the base plate is mounted on the upper portion of the portion where the spare tire is located on the layout of the vehicle, the battery module has an asymmetrical mounting structure. At this time, when the vibration from the road surface is severe, the battery module is subjected to a torsional load, and this torsional load is very likely to cause damage due to the concentration of stress on the fastening portions of the base plate and the respective bent portions of the base plate.

Therefore, the stack structure of the unit modules in the medium-large battery module is stable and the fastening position of the base plate is asymmetric, so that even if the vibration in the up-down direction is more severely applied to one side, the battery module has a new structure. The need for this is very high.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and the technical problems required from the past.

An object of the present invention is to provide a battery module that can minimize the damage to the fastening portion by mounting a patch plate of a specific structure in the fastening portion of the base plate and the battery module mounting portion.

Still another object of the present invention is to provide a battery module that can be stably mounted in a vehicle and minimize the volume occupied in the vehicle by forming a partial structure of the battery module using some form of the vehicle.

According to an aspect of the present invention,

A medium-large battery module having a structure including a secondary battery itself or a unit module containing two or more secondary batteries,

The unit modules are mounted on a predetermined portion of the device ("battery module mounting site") in a state of being mounted on a base plate,

The base plate includes a top surface on which unit modules are mounted, a side portion of a structure bent downward along the outer circumferential surface of the top surface, and two or more fastening portions protruding from the side portion to fix the base plate to the battery module mounting portion. It consists of,

At least one of the fastening portions may further include a patch plate surrounding the upper surface of the fastening portion and the side surface and the upper surface of the corresponding fastening portion to prevent deformation due to vertical vibration and improve mechanical rigidity. It consists of a structure that is attached.

Therefore, in the battery module according to the present invention, since the patch plate surrounds the upper surface of the fastening portion and the side portion and the upper surface portion of the base plate corresponding thereto, it is possible to prevent deformation due to vertical vibration applied to the battery module and to improve mechanical rigidity. .

In addition, as described above, the double bending structure surrounding the patch plate not only to the fastening portion of the base plate but also to the upper surface portion can prevent the deformation of the fastening portion and increase the mechanical rigidity without increasing the thickness of the base plate. Weight gain can be minimized.

The unit module in the present invention may be a secondary battery itself or a small module having two or more secondary batteries built therein. An example of a unit module having two or more secondary batteries embedded therein may be the module of Korean Patent Application No. 2006-12303. The unit module in the above application has a structure mounted on a frame member in which an input / output terminal is formed in close contact with two secondary batteries facing each other.

Another example of a unit module may include the modules of Korean Patent Application Nos. 2006-20772 and 2006-45444. The unit module in these applications consists of a structure in which two secondary batteries are covered with a pair of high-strength cell covers while their outer surfaces are in close contact with each other.

The above applications are incorporated by reference in the context of the present invention. However, of course, the structure of the unit module in the battery module of the present invention is not limited to the examples of the above applications.

The unit modules are mounted on the base plate in a vertical state, a pair of end plates in close contact with the outer surface of the outermost unit modules in a state where the lower end is fixed to the base plate, and the end plate It may be a structure consisting of a supporting bar that connects the upper both sides or the side both sides of the end plates to interconnect them to support.

Therefore, the battery module according to the present invention closely adheres the unit modules stacked on the base plate to the end plate, and fixes the end plate again to the supporting bar, thereby preventing movement and swelling in the thickness direction of the unit module. Therefore, it is possible to improve the safety of the battery module and effectively prevent performance degradation.

The patch plate forms, for example, a first mounting portion mounted on an upper surface portion of the base plate, a second mounting portion mounted on a side portion of the base plate, and a third mounting portion mounted on the fastening portion of the base plate. It may consist of a curved plate-shaped plate.

As a preferable example of the structure, a fastener is perforated in the fastening portion of the base plate, and a through hole communicating with the fastener is formed in the third mounting portion, so that an insertion member such as a bolt is fastened to the base plate. The battery module can be easily mounted on the battery module mounting portion of the desired device by inserting the battery module continuously into the through hole of the sphere and the patch plate.

The patch plate and the base plate is not particularly limited as long as it is a method of firmly and easily bonding to each other, but preferably, the patch plate is mounted on the base plate by welding to further improve the mutual bonding force. Can be.

Preferably, the welding may be performed between the first mounting portion and the upper surface portion of the base plate and the third mounting portion and the fastening portion of the base plate.

Therefore, since the welding points are located only on the first mounting portion and the third mounting portion of the patch plate, no buckling occurs in the second mounting portion of the patch plate.

In addition, since the load acts parallel to the welding direction, no shear load is generated, and as a result, the second mounting portion of the patch plate faithfully plays a role of reinforcing the bending stiffness, thereby preventing the possibility of breakage around the welding point. Can be.

Furthermore, it is preferable that the welding point is located in the first mounting part, which is the upper surface of the patch plate, and when the welding point is located in the second mounting part, which is the side surface, cracks due to shearing are not preferable.

On the other hand, the fastening portions are formed on the side parts of the long sides facing each other of the base plate, compared with the structure formed in the side parts of the short sides facing each other of the base plate, compared with the battery module mounting portion of the device It can be combined more stably.

As a preferred example of the structure, one side portion of the long side, one side portion has a fastening portion is formed only in the adjacent portions on both sides, may be a structure in which a patch plate is mounted on the fastening portion.

As a specific example, when the battery module is mounted in the trunk of the vehicle, since the spare tire or wheel housing is located on a portion of the base plate on the layout of the vehicle, the side portions of the long sides of the base plate may have asymmetrical fastening positions with each other. do.

Accordingly, two fastening portions are structurally formed only at two corner portions adjacent to one side portion corresponding to an upper portion of a space in which a spare tire or wheel housing having an asymmetrical fastening position among the long sides is formed, and the other side portion is a spare. Since no tire or wheel housing is located, four fasteners can be formed. In this case, since the side coupling portion formed of only two fastening portions of the base plate is weaker than the side portion on which the four coupling portions are formed, the mounting coupling force on the vehicle is weakened, thereby additionally mounting the patch plate on the two coupling portions to compensate for the mounting coupling force on the vehicle. can do.

In some cases, the patch plate and the fastening portion is formed in a shape corresponding to the battery module mounting portion, it is possible to strengthen the mutual coupling force and minimize the separation from each other even if an external force is applied from the outside.

The present invention also provides a battery module comprising an end plate of a specific structure.

In detail, the end plate may include a main body part in contact with the unit module and a top wall and a bottom wall protruding outwardly from the outer circumferential surface of the main body part so as to distribute bending loads from the unit modules and the supporting bar. And a pair of sidewalls, and the sidewalls may have a structure in which thickness increases from the top wall to the bottom wall.

Here, the "outward direction" refers to the direction opposite to the pressure, that is, the direction opposite to the direction in which the unit modules and the supporting bar are positioned around the main body of the end plate.

Accordingly, the end plate includes a main body portion in contact with the unit module and a top wall, a bottom wall, and a pair of side walls protruding outwardly from the outer circumferential surface of the main body portion, and the side walls are thick in the direction from the top wall to the bottom wall. Since the structure is increased, the pressure (bending load) from the unit modules and the supporting bar can be evenly distributed on the top wall, the bottom wall and the side wall.

In the battery module of the present invention, the end plate may have various structures that can effectively distribute the bending loads from the unit modules and the supporting bar.

As an example of such a structure, an outer circumferential surface of the side wall may have a straight shape, and the side wall may have a right triangle shape in a lateral direction.

Therefore, this structure can support the bending loads from the unit modules and the supporting bar more effectively than the structure of the end plate (Fig. 10: 30A) in which the side wall is formed in a straight (rectangular) shape in the lateral direction.

The reason why the end plate shape effectively supports the bending load is that the side plate fixing area and the side wall for supporting the bending load increase in thickness from the top wall to the bottom wall and are formed in a right triangle shape in the lateral direction. This is because the load concentrated on the fastening portion of the end plate can be distributed to the side walls and the bottom wall.

As another example, the outer circumferential surface of the side wall may have a parabolic structure. Since the outer circumferential surface of the side wall has a parabolic shape, the end plate of this structure can gently absorb the bending loads from the unit modules and the supporting bar than when the outer circumferential surface is linear.

In this case, the parabolic shape may be formed in various shapes. For example, the parabolic shape may protrude convexly outward from the bottom edge of the outermost unit module. The end plate of such a structure is particularly preferable because it can absorb the bending load as effectively as possible while suppressing the increase in volume of the battery module as much as possible.

In some cases, the parabolic shape may be a shape recessed inwardly with respect to the bottom edge of the outermost unit module.

According to the results of experiments by the inventors of the present invention, the end plate having such a structure has a larger deformation amount due to bending load than the shape protruding outwardly from the bottom edge of the outermost unit module, but the outer peripheral surface of the side wall is It was confirmed that the deformation amount was smaller than the case of the straight shape.

The end plate has a structure in which the area size increases in the order of the top wall, the side wall, and the bottom wall, so that the structural dynamics can easily withstand the pressure from the supporting bar and the unit modules.

In the above structure, the area of the side wall may be greater than 40% to 90% of the size of the bottom wall.

When the area of the side wall is less than 40% of the area of the bottom wall, the side wall is difficult to support the bending load from the supporting bar and the unit modules, and if it exceeds 90%, it is not preferable because the volume of the battery module increases as a whole.

More preferably, the area of the side wall may be of a size of 55% to 75% based on the area of the bottom wall. The side wall area size in this range is highly desirable because it can easily support the bending load while minimizing the increase in the overall volume of the battery module.

On the other hand, since a pair of through holes for mounting the supporting bar is formed on the upper end of the main body of the end plate, the supporting bars are easily inserted into the through holes of the end plate to achieve mutual coupling.

The supporting bar may be a structure connecting the upper both sides of the end plates, or may be a structure connecting the both sides of the side of the end plates.

In the structure in which the supporting bar connects the upper both sides of the end plates, preferably, the top wall of the end plate protrudes upward with respect to the top surface of the outermost unit module for mounting the supporting bar, so that the supporting bar is at the top of the unit modules. It may be located in the structure coupled to the end plate.

The upwardly protruding height of the upper wall may be 2 to 20% in size based on the height of the outermost unit module, and when the height is less than 2% of the height of the outermost unit module, mounting the supporting bar to the end plate. The overall stiffness can be impaired because of the difficulty or size of supporting bars. On the contrary, when it exceeds 20%, the increase in volume of the battery module becomes too large, which is not preferable.

The end plate is fixed in a structure in which the bottom wall is coupled on the base plate, so that the end plate is prevented from being released from the base plate even when an impact is applied to the end plate from the outside.

For example, a pair of fastening grooves are formed in a portion of the bottom wall of the end plate, and a bolt may be inserted into the fastening grooves to fix the end plates to the base plate, or to achieve mutual coupling through welding. have.

The present invention also provides an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle that uses the battery module as a power source and has a limited mounting space and is exposed to frequent vibrations and strong shocks.

The battery module used as the power source of the vehicle can of course be manufactured in combination according to the desired output and capacity.

In this case, the vehicle may be an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle in which the battery module is mounted in the trunk of the vehicle.

Electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles using the battery module as a power source is known in the art, so a detailed description thereof will be omitted.

As described above, in the battery module according to the present invention, by attaching a patch plate having a specific structure to a fastening portion between the base plate and the battery module mounting portion, damage of the fastening portion can be minimized.

In addition, by forming a partial structure of the battery module by using some form of the vehicle it can be stably mounted on the vehicle, it is possible to minimize the volume of the battery module occupies in the vehicle.

1 is a perspective view of a conventional battery module;
2 and 3 are enlarged schematic views of the portion A of FIG. 1;
4 is a perspective view of a battery module according to an embodiment of the present invention;
5 is a rear view of FIG. 4;
6 and 7 are enlarged schematics of the portion B of FIG. 4;
8 is a perspective view of an exemplary conventional patch plate;
9 is a perspective view of a patch plate according to another embodiment of the present invention;
10 is a schematic diagram showing a conventional end plate structure;
11-13 are perspective views of end plates according to various embodiments of the present invention;
14 and 15 are photographs showing experimental results showing the deformation amount of the fastening portion according to the patch plate structure of FIGS. 8 and 9.

Hereinafter, with reference to the drawings of the battery module according to an embodiment of the present invention, this is for easier understanding of the present invention, the scope of the present invention is not limited thereto.

4 is a schematic perspective view of a battery module according to an embodiment of the present invention, Figure 5 is a schematic rear view of FIG.

6 and 7 are enlarged schematic views of the portion B of FIG. 4, FIG. 6 shows a structure before welding the patch plate to the base plate, and FIG. 7 shows a structure after welding the patch plate to the base plate. have.

Referring to these drawings, the battery module 200 includes a unit module 10, a base plate 20, a pair of end plates 30, a pair of patch plates 70, the secondary batteries are built-in, And a supporting bar 40.

The unit modules 10 are mounted on the battery module mounting portion (not shown) of the device in a state in which the unit modules 10 are mounted on the base plate 20.

The base plate 20 includes a top surface portion 23 on which the unit modules 10 are mounted, a side surface portion 24 having a structure bent downward along the outer circumferential surface of the top surface portion 23, and a base plate 20. It includes six fastening portions 22 protruding from the side portion 24 for fixing to the site (eg inside the vehicle, etc.).

The fastening parts 22 are formed on the side parts 24 and 25 of the long sides facing each other of the base plate 20.

In addition, the plate 70 has a fastening portion 22 formed only at both edges adjacent to one side portion 24 of one of the side portions 24 and 25 of the long side.

The patch plate 70 surrounds the upper surface of the fastening portion 22 and the side portion 24 and the upper surface portion 23 of the base plate 20 corresponding thereto, thereby preventing deformation due to vertical vibration and improving mechanical rigidity. .

In addition, the patch plate 70 is a bent plate-shaped plate, which is mounted on the first mounting portion 72 mounted on the upper surface portion 23 of the base plate 20 and the side portion 24 of the base plate 20. It consists of the 2nd mounting part 74 and the 3rd mounting part 76 mounted on the fastening part 22 of the base plate 20. As shown in FIG.

A fastener 26 is drilled in the fastening portion 22 of the base plate 20, and a through hole communicating with the fastener 26 of the base plate 20 is connected to the third mounting portion 76 of the patch plate 70. A sphere 78 is formed.

In addition, the patch plate 70 is mounted to the base plate 20 by welding, and the welding points 77 and 79 are connected to the first mounting portion 72 and the third mounting portion 79 of the patch plate 70. It is formed at the top.

Meanwhile, the unit modules 10 are vertically stacked and stacked on the upper portion of the base plate 20, and the end plate 30 is the outermost unit modules 10 having the lower end fixed to the base plate 20. It is in close contact with the outer surface.

The supporting bar 40 connects the upper both sides of the end plates 30 to interconnect and support the pair of end plates 30.

The end plate 30 includes a main body 32 in contact with the unit module 10, a top wall 34, a bottom wall 36, and a pair protruding outwardly from the outer circumferential surface of the main body 32. The side wall 38 of the side wall 38 is made of a structure in which the thickness increases from the top wall 34 toward the bottom wall 36. Accordingly, the bending loads from the unit modules 10 and the supporting bar 40 are distributed from the main body 32 to the side wall 38 and the bottom wall 36.

The end plate 30 is fixed in a structure in which the bottom wall 36 is joined by welding on the base plate 20.

FIG. 8 schematically illustrates a perspective view of an exemplary conventional patch plate, and FIG. 9 schematically illustrates a perspective view of a patch plate according to another embodiment of the present invention.

First, referring to FIG. 8, the patch plate 80 and the fastening part 22a have a shape corresponding to a spare tire mounting space which is a battery module mounting part, and the fastening part 22a and the side part of the base plate 20a ( It is attached to 24a) by welding, respectively.

In addition, a wiring member through hole 82 for inserting the wiring member is formed on the side surface of the patch plate.

In contrast, referring to FIG. 9, the patch plate 90 is mounted on the fastening portion 22a and the upper surface portion 23a of the base plate 20a by welding, which is different from the structure of FIG. 8. .

11 to 13 schematically illustrate perspective views of an end plate according to various embodiments of the present disclosure.

First, referring to FIG. 11 together with FIG. 4, the outer circumferential surface of the side wall 38 has a straight shape, and the side plate 38 has a substantially right triangular shape in the lateral direction.

The end plate 30b has a structure in which the area size increases in the order of the top wall 34, the side wall 38, and the bottom wall 36, and the area of the side wall 38 is based on the area of the bottom wall 36. It consists of about 60% in size.

Furthermore, a pair of through holes 302 for mounting the supporting bar 40 are formed on the main body 32 of the end plate 30b, and the outer circumferential surface of the end plate 30b is treated with the fillet 31. This effectively prevents the stress from the supporting bar 40 and the unit modules 10 from being concentrated on the outer circumferential surface of the end plate 30b.

The upper wall 34 of the end plate 30b protrudes upwards to a size of 10% of the height H of the outermost unit module 10 with respect to the upper surface of the outermost unit module 10, thereby supporting the supporting bar ( 40 is easily mounted on both upper sides of the end plate 30.

Next, referring to FIG. 12 together with FIG. 4, the end plate 30c has a parabolic shape in which the outer circumferential surface of the side wall 38c is recessed inwardly with respect to the bottom edge of the outermost unit module 10. consist of.

Finally, referring to FIG. 13 together with FIG. 4, the end plate 30d has a parabolic shape in which the outer circumferential surface of the side wall 38d protrudes outwardly with respect to the bottom edge of the outermost unit module 10. have.

On the other hand, in order to check the deformation amount of the fastening portion according to the patch plate structure of Figures 8 to 9, the simulation of the maximum stress in the state in which the patch plate having the shape of these figures mounted in the battery module in the same structure as Figure 4 Was performed.

More accurate sizes and shapes of patch plates are disclosed in FIGS. 14 and 15, which are shown with stress distributions. In addition, in Table 1 below, the initial resonance frequency of the patch plate of FIG. 8 and the initial resonance frequency of the patch plate of FIG. 9 are described.

TABLE 1

As shown in FIG. 14, the patch plate structure of FIG. 8 shows a high stress distribution on the lower surface and the side surface of the patch plate. In particular, the patch plate structure of the patch plate has a very high surface area at the through hole coupled to the battery module mounting portion of the patch plate. High stress distributions are shown. Therefore, the site | part which shows high stress distribution has a high possibility of a failure at the time of applying an external force.

On the other hand, as shown in Figure 15, the patch plate structure of Figure 9 it can be seen that the stress is significantly reduced compared to the patch plate structure of FIG.

In addition, as shown in Table 1, the patch plate structure of FIG. 9 has an initial resonance frequency greater than that of the patch plate structure of FIG. 8, and thus the vibration resistance is relatively excellent even if the vehicle generates vibration along the road surface.

Therefore, the above experimental results mean that the deformation amount and the stress can be reduced only by changing the shape of the patch plate and the position of the welding point, which is an unexpected result.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (21)

A medium-large battery module having a structure including a secondary battery itself or a unit module containing two or more secondary batteries,
The unit modules are mounted on a predetermined portion of the device ("battery module mounting site") in a state of being mounted on a base plate,
The base plate includes a top surface on which unit modules are mounted, a side portion of a structure bent downward along the outer circumferential surface of the top surface, and two or more fastening portions protruding from the side portion to fix the base plate to the battery module mounting portion. It consists of,
At least one of the fastening portions may further include a patch plate surrounding the upper surface of the fastening portion and the side surface and the upper surface of the corresponding fastening portion to prevent deformation due to vertical vibration and improve mechanical rigidity. Is equipped,
The unit modules are mounted on the base plate in a vertical state, a pair of end plates in close contact with the outer surface of the outermost unit modules in a state where the lower end is fixed to the base plate, and the end plate It consists of a supporting bar which connects the upper side or both sides of the end plates to interconnect them.
The end plate may include a main body portion in contact with the unit module and a top wall, a bottom wall, and a shape protruding outward from an outer circumferential surface of the main body portion so as to distribute bending loads from the unit modules and the supporting bar. And a pair of side walls, wherein the side walls have a structure in which a thickness increases in a direction from a top wall to a bottom wall. delete 2. The patch plate of claim 1, wherein the patch plate forms a first mounting portion mounted on an upper surface portion of the base plate, a second mounting portion mounted on a side portion of the base plate, and a third mounting portion mounted on the fastening portion of the base plate. The battery module, characterized in that the bent plate-shaped plate. 4. The battery module according to claim 3, wherein a fastener is drilled in the fastening portion of the base plate, and a through hole communicating with the fastener is formed in the third mounting portion. 4. The battery module according to claim 3, wherein the patch plate is mounted to the base plate by welding. 6. The battery module according to claim 5, wherein the welding is performed between the first mounting portion and the upper surface portion of the base plate and the third mounting portion and the fastening portion of the base plate. The battery module according to claim 1, wherein the fastening parts are formed at side parts of the long sides facing each other of the base plate. The battery module according to claim 7, wherein one of the side parts of the long side is provided with a fastening part only at an adjacent side portion of both side edges, and a patch plate is mounted on the fastening part. The battery module according to claim 1, wherein the patch plate and the fastening portion have a shape corresponding to the battery module mounting portion. delete The battery module according to claim 1, wherein an outer circumferential surface of the side wall has a straight shape, and the side wall has a right triangle shape in a lateral direction. The battery module according to claim 1, wherein an outer circumferential surface of the side wall has a parabolic shape. The battery module according to claim 1, wherein the end plate has a structure in which the area size increases in the order of the top wall, the side wall, and the bottom wall. The battery module according to claim 1, wherein a pair of through holes for mounting a supporting bar is formed on an upper portion of the main body of the end plate. The battery module according to claim 1, wherein the top wall of the end plate protrudes upward with respect to the top surface of the outermost unit module for mounting the supporting bar. The battery module according to claim 1, wherein the end plate is fixed in a structure in which a bottom wall is coupled to the base plate. An electric vehicle using the battery module according to claim 1 as a power source. 18. The electric vehicle according to claim 17, wherein the battery module is mounted on a trunk of the vehicle. A medium-large battery module having a structure including a secondary battery itself or a unit module containing two or more secondary batteries,
The unit modules are mounted on a predetermined portion of the device ("battery module mounting site") in a state of being mounted on a base plate,
The base plate includes a top surface on which unit modules are mounted, a side portion of a structure bent downward along the outer circumferential surface of the top surface, and two or more fastening portions protruding from the side portion to fix the base plate to the battery module mounting portion. It consists of,
At least one of the fastening portions may further include a patch plate surrounding the upper surface of the fastening portion and the side surface and the upper surface of the corresponding fastening portion to prevent deformation due to vertical vibration and improve mechanical rigidity. Equipped with
The fastening parts are formed on side parts of the long sides facing each other of the base plate,
Among the side parts of the long side, one side portion of the battery module, characterized in that the fastening portion is formed only in the adjacent portions on both side corners, the patch plate is mounted on the fastening portion. A hybrid electric vehicle characterized by using the battery module according to claim 1 as a power source. A plug-in hybrid electric vehicle characterized by using the battery module according to claim 1 as a power source.

Images