KR20170065832A - Base Plate for Battery Pack Having Three-layered Structure - Google Patents

Abstract

The present invention relates to a base plate for mounting a plurality of battery modules and combined with a pack cover to constitute a battery pack, comprising: a first plate fixed to an external device and supporting a load of the battery modules; A second plate positioned on the first plate and having a sealing portion to which the pack cover is coupled to seal the battery modules from the outside; And a third plate positioned on the second plate and having one or more module mounting portions for mounting the battery module; And the first plate, the second plate, and the third plate are closely stacked in the vertical direction.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a base plate for a battery pack having a three-

The present invention relates to a base plate for a battery pack having a three-layer laminated structure.

2. Description of the Related Art [0002] Recently, as technology development and demand for mobile devices have increased, the demand for secondary batteries capable of charging and discharging as energy sources has been rapidly increasing, and a lot of research has been conducted on secondary batteries that can meet various demands. In addition, the secondary battery is an electric vehicle (EV), a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (HEV), and the like, which are proposed as solutions for air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels (Plug-In HEV) and the like.

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) secondary batteries are mainly used as secondary batteries as power sources for EV, HEV, etc. Recently, researches using lithium secondary batteries having high energy density, high discharge voltage and output stability have been actively conducted And some are commercialized.

When such a secondary battery is used as a power source for an automobile, the secondary battery is used in the form of a battery pack including a plurality of battery modules or a battery module assembly.

The vehicle battery pack is generally electrically connected to the respective devices while being mounted in an inner space such as a trunk. However, large and small vibrations inevitably occur during operation of the vehicle. There are slight vibrations caused by the vibration of the engine or the motor, and there is also a large vibration caused by the unevenness of the road such as the brakes.

Such vibration may damage the sealed state of the battery pack for the vehicle, and foreign matter may penetrate the battery pack, or the battery pack fixed to the vehicle frame may be detached.

In addition, since the vehicle battery pack supplies power to each electrically connected device, if the electrical connection state is released regardless of the user's intention, the operation control of the user may not be possible, which may lead to a major accident .

Therefore, there is a high need for a technique that can firmly fix the vehicle battery pack to the frame of the vehicle and prevent infiltration of foreign matter into the inside of the vehicle battery pack even when such external vibration or impact is applied.

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

The inventors of the present application have conducted intensive research and various experiments. As described later, when a base plate constituting a battery pack is combined with a pack cover to form a specific three-layer laminated structure, It is possible to improve the stability and stability of the vehicle frame at the same time, and as a result, the stability is improved, and the present invention has been accomplished.

Therefore, the base plate according to the present invention is a base plate on which a plurality of battery modules are mounted and combined with a pack cover to constitute a battery pack, comprising: a first plate fixed to an external device and supporting a load of the battery modules; A second plate positioned on the first plate and having a sealing portion to which the pack cover is coupled to seal the battery modules from the outside; And a third plate located on the second plate and having at least one module mounting portion for mounting the battery module; And the first plate, the second plate, and the third plate are closely stacked in the vertical direction.

Although the battery modules are generally composed of a plurality of battery modules, it is not intended to exclude that the battery module includes only one battery module, and in some cases, the battery module may include only one battery module. However, it is preferable to improve the energy density of the battery pack by using two or more battery modules. Furthermore, the battery pack in which the battery modules are arranged in a state of being spaced apart from each other in a shape matching the dead space of the device on which the battery pack is mounted can improve the space efficiency of the device.

As described above, the base plate for a battery pack of a three-layer laminated structure according to the present invention is composed of a first plate, a second plate and a third plate having different functions.

The first plate may be formed in a plate shape, and the base plate may be fixed to an external device, for example, a frame of the vehicle through the first plate.

Further, the base plate may be formed to completely seal the inside in combination with the pack cover. To this end, the base plate further includes a second plate, and the second plate is provided with a sealing portion for sealing the battery modules by engaging with the pack cover.

The base plate includes a third plate having a module mounting portion for mounting the battery module. In addition to the battery module, the module mounting portion may be formed to mount a control member or a cooling member for controlling the battery module.

In one specific example, the third plate includes: a first plate-like member extending in a first direction and being rectangular in plan view; And a second plate-like member extending in a second direction perpendicular to the first direction and being rectangular in plan view; And the first plate member and the second plate member may be vertically coupled on the same plane to be formed into a T shape.

Specifically, the battery pack to which the base plate and the pack cover are coupled may be formed in a T shape so as to be positioned over the lower portion of the rear magnet of the vehicle and the lower portion of the armrest.

Accordingly, in order to form the base plate into a T-shape, the third plate may be formed in a planar shape in which a first plate member and a second plate member, which are rectangular, are combined.

With respect to the first direction and the second direction, for example, the width direction of the vehicle on which the base plate is mounted may be defined as a "first direction ", and the longitudinal direction of the vehicle may be defined as a" second direction ".

The first plate member extends in the first direction and the second plate member extends in the second direction so that the first plate member and the second plate member are coupled to form a T shape.

Accordingly, the first plate-shaped member and the second plate-shaped member may be formed to have different widths with respect to the longitudinal direction of the vehicle, or may be formed with the rectangular plate-shaped members having different widths coupled to each other. In detail, the width of the first plate member may be formed to be in the range of 100% to 400% of the width of the second plate member.

In this structure, one side of the first plate-shaped member and one side of the second plate-shaped member can be joined to each other in the mutually perpendicular direction on the same plane. In detail, one side of the second plate-shaped member can be coupled to the center of one side of the first plate-shaped member.

Thus, by forming the base plate into a T-shape, the horizontal cross-section of the battery pack can be formed into a T-shape, thereby allowing a worker to repair and replace the battery pack without interfering with other devices mounted on the vehicle And it is possible to use the space of the vehicle more efficiently and to use the inner space of the vehicle more widely by the user.

Further, the battery pack can be configured such that the weight applied to the left and right sides of the battery pack can be balanced by being positioned at the central portion of the device such as an automobile in a plan view. Thus, It is possible to more easily perform the mechanical design of the device in consideration of the weight of the device.

Although the third plate is formed in a T shape in one embodiment of the present invention, the shape of the third plate is not limited thereto, and may be formed in a different shape in consideration of the shape, size, to be.

In one specific example, the module mounting portion of the third plate has a frame structure in which an opening is formed at the center while supporting the lower peripheral edge of the outer periphery of the battery module, and one battery module or two or more battery modules Respectively.

In this structure, the module mounting portion supports both side lower ends of the battery module, and a cooling member for cooling the battery module may be inserted into the opening to exchange heat with the lower portion of the battery module.

The module mounting portion formed on the third plate may be composed of first to third module mounting portions. In this structure, the arrangement directions of the battery modules fixed to the first module mounting portion and the second module mounting portion are different from each other, and the arrangement direction of the battery modules fixed to the second module mounting portion and the third module mounting portion may be the same have.

At this time, the first plate-shaped member of the third plate may include a pair of first module mounting portions located on opposite sides in the first direction, and a pair of second module mounting portions located between the first module mounting portions, And a second module mount of a different battery module orientation.

Specifically, the pair of first module mounts may be symmetrically positioned on both sides of the first plate member, and a second module mount may be formed between the first pair of symmetrical module mounts.

In this structure, the first module mounting portion may have a predetermined width and may be formed long in the second direction, so that the battery module may also be arranged in a line in the second direction when mounted on the first module mounting portion.

Alternatively, the battery modules mounted on the second module mounting portion may be arranged in a line in the first direction. Therefore, the second module mounting portion may have an opening shape having a width corresponding to the length of the battery module in the second direction, and the width in the first direction may be different because the number of the battery modules may be different depending on the designer's choice.

On the other hand, the second plate member of the third plate may include a third module mounting portion of the same battery module orientation as the second module mounting portion. The shape of the third module mounting portion may be the same as the shape of the second module mounting portion. However, this implies that it can be formed differently depending on the designer's choice.

Thus, by forming the battery modules in different directions from each other, the energy density of the battery pack can be improved within a limited space inside the vehicle. Further, by configuring the battery pack in a more various shape, it is possible to more easily overcome the restriction on the mounting space of the battery pack.

In the present invention, the battery cells constituting the battery modules may be generally formed of a pouch-shaped battery cell having a plate-shaped structure.

In one specific example, the third plate may have a structure in which upwardly protruding fastening protrusions for fixing the battery module are formed. The fastening protrusions may be formed of, for example, welded bolts, and the fastening protrusion may be coupled with the fastening protrusion in a state where the battery module is mounted, thereby stably fixing the battery module. The fixing member may be a member such as an end plate, a bracket, or the like, but is not limited thereto.

In one specific example, the first plate and the second plate may each have island-shaped beads formed in an upward protruding structure or a downward indentation structure.

The island-shaped beads are independent types of beads, and these island-shaped beads are formed on the plate at regular intervals to improve the strength of the plate.

In one specific example, the first plate is formed with island-shaped beads having upward protruding structure, the second plate is formed with island-shaped beads having a downward indentation structure, and the island- Lt; RTI ID = 0.0 > 2-plate < / RTI > The island-shaped beads may be, for example, rectangular or square in plan view.

Since the island-shaped beads are formed on the first and second plates, the first plate and the second plate are closely contacted with each other while minimizing the meandering or twisting phenomenon of the first plate and the second plate, thereby contributing to the improvement of the strength in the lamination direction.

The second plate is positioned between the first plate and the third plate and functions to seal the battery module by engaging with the pack cover. In other words, the pack cover is not bonded directly to the first plate, but is separately bonded using the second plate.

Since the first plate is directly coupled with an external device such as a vehicle, external vibration or impact is directly transmitted, so that the battery module may not be completely sealed.

If the first plate and the cover pack are sealed to seal the battery module, a space may be generated between the first plate and the cover pack due to continuous vibration during operation of the vehicle, Can penetrate and cause serious hazards.

Therefore, the second plate is stacked on the first plate, and the sealing plate is provided on the second plate, so that the battery pack can be completely sealed from the outside.

The sealing portion may include an outer protruding portion protruding upward at a predetermined height and width along the outer periphery of the upper surface of the second plate. The sealing portion may be formed to protrude upward with a predetermined height and width, And at the same time, the battery pack can be tightly shielded.

Further, the sealing portion may further include a sealing gasket interposed at the interface with the pack cover when the pack cover is engaged with the outer peripheral projection. Needless to say, the gasket may be formed of, for example, a rubber material.

The second plate, unlike the first plate or the third plate, is preferably composed of one unit, thereby providing high sealability.

On the other hand, the outer peripheral end of the third plate can be closely fixed to the inner side of the outer peripheral projection. By fitting the third plate in the vertical direction on the inner side of the outer circumferential projection, it is possible to exert a bonding force of not less than a predetermined strength without a separate bolt-nut connection or welding.

In addition, a pair of outwardly projecting first fastening portions are formed at an end of the second plate member coupled to the first plate member, and a downwardly recessed And the first fastening portions may be coupled to each other by spot welding while being accommodated in the second fastening portions.

At this time, the third plate may be formed so as to increase the contact area at the time of engagement by engaging with each other through the first fastening portion and the second fastening portion, and not to release the coupling to the external force in the horizontal direction. In addition, the first plate member and the second plate member can be strongly coupled by spot welding to the minute gap where the first and second fastening portions are coupled.

In one specific example, the first plate is a third plate member corresponding to the first plate member of the third plate; And a fourth plate member corresponding to the second plate member of the third plate; And the third plate member and the fourth plate member are vertically coupled on the same plane to form a T shape.

In detail, the first plate may be configured such that two different plate members are coupled to each other like the third plate.

The first plate is made of a material or structure having a relatively higher rigidity than the third plate. This is because the first plate is directly coupled to the frame of the vehicle and plays the role of supporting the battery module. Therefore, it is preferable that the first plate is formed of a thicker metal member than the second and third plates.

In one example, the first plate is formed so that the third and fourth plate members, which are two different plate members, are joined to each other. This is because, by selecting a rigid material for mechanical rigidity and increasing the thickness of the product, .

The first plate and the second plate may have a structure in which a plurality of fixing holes for engaging with external devices are perforated on the outer periphery of each of the first plate and the second plate.

In this structure, the fixing holes of the first plate are formed on the island-shaped beads of the upward protruding structure, and the fixing holes of the second plate may be formed on the portion extending outward from the sealing portion.

Specifically, the fixing holes of the first plate may be formed apart from the outer periphery of the first plate and may be coupled to the external device through a coupling member such as a bolt. In addition, the second plate may form a wing portion extending in the outward direction of the seal portion, and the second plate fixing holes may be formed on the wing portion.

In the above structure, each of the first and second plate fixing holes may be disposed at a position facing each other, and one coupling member may be formed to be fixed to the external device through the first and second plate fixing holes.

Meanwhile, the third plate may be provided with at least one stud bolt on which a control member for controlling the operation of the battery modules may be mounted and fixed.

In one specific embodiment, the battery module is electrically connected and may include a plurality of adjacent arranged battery cells. Each of the battery modules may include, for example, 12 to 24 battery cells, and the battery cell may be formed of a lithium secondary battery. The number of battery cells constituting the battery modules may be the same or different.

The structure of the lithium secondary battery and the manufacturing method thereof are well known in the art, and a detailed description thereof will be omitted in this specification.

The present invention also provides a battery pack having a structure in which battery modules are mounted on the base plate and a pack cover can be coupled.

The pack cover is bonded to the second plate of the base plate, specifically, to the sealing portion of the second plate composed of one unit member, and exhibits a high shielding property.

Further, the present invention provides a device including the battery pack as a power source.

The device may be any one selected from the group consisting of an electric vehicle, a hybrid electric vehicle, or a plug-in hybrid electric vehicle, for example.

As described above, by forming the base plate into a T shape, the battery pack can be mounted in the lower center of the vehicle, for example, in the lower part of the rear seat occupancy space, So that the internal space of the vehicle can be efficiently utilized.

In one specific example, the battery pack in the device may be a structure that is mounted in a structure isolated from an interior (boarding space) of an automobile.

As described above, when the battery pack is exposed to a high temperature environment or malfunctions, if an internal short circuit occurs in the battery cell constituting the battery pack, a decomposition reaction of the electrolyte occurs at the positive electrode interface, The battery case ruptures and is discharged to the outside of the battery cell.

Generally, such an internal gas contains poisonous components which are harmful to the human body such as carbon monoxide and the like, thus causing safety problems.

On the other hand, the battery pack according to the present invention is mounted in a device in a structure isolated from the interior of the vehicle, thereby preventing the internal gas from flowing into the interior of the vehicle, thereby solving the safety problem.

The structure and manufacturing method of such a device are well known in the art, so a detailed description thereof will be omitted herein.

As described above, the base plate for a battery pack according to the present invention is formed by stacking the first to third plates having different functions, and is firmly fixed to the external device, and at the same time, It is possible to completely seal the mounted battery module from the outside and thereby to overcome the limitation on the mounting position of the battery pack in a device such as an automobile and to minimize the volume of the battery pack relative to the capacity, The space utilization of the device can be maximized.

1 is an exploded perspective view of a base plate for a battery pack according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a state in which the base plate for the battery pack of FIG. 1 is coupled.
3 is a perspective view schematically showing the structure of a second plate of the base plate for a battery pack of FIG.
4 is a perspective view schematically showing the structure of a third plate of the base plate for a battery pack of FIG.
FIG. 5 is a perspective view schematically showing a state where a fixing member is coupled to a third plate of the base plate for a battery pack of FIG. 1;
6 is an exploded perspective view showing a state where a cooling member is mounted on the base plate for a battery pack of FIG.
FIG. 7 is a perspective view showing a state in which battery modules are mounted on the base plate for the battery pack of FIG. 1; FIG.
8 is a perspective view of a battery pack according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

FIG. 1 is an exploded perspective view of a base plate for a battery pack having a three-layer laminated structure according to one embodiment of the present invention, and FIG. 2 is a perspective view showing a combined state.

Referring to FIGS. 1 and 2, a base plate 100 for a battery pack according to an embodiment of the present invention includes a first plate 110, a second plate 140, and a third plate 170).

The base plate 100 has a structure in which a second plate 140 is laminated on a first plate 110 and a third plate 170 is sequentially laminated on a second plate 140.

The first plate 110 has a substantially T-shape in plan view and is fixed directly to an external device, for example, a frame of the vehicle. And a plurality of first fixing holes 117 spaced apart from each other to be fixed to a frame of the vehicle.

The second plate 140 is formed of a unit and includes second fixing holes 147 at positions facing the first fixing holes 117 formed in the first plate 110. Therefore, the base plate 100 can be fixed to the frame (not shown) of the vehicle by fastening a fastening member (not shown) to the first fastening holes 117 and the second fastening holes 147.

The first plate 110 is formed with island-shaped beads 111 having an upward protruding structure and the second plate 140 is formed with island-shaped beads 141 having a downward indentation structure. Type beads 111 of the first plate 110 may face the island-shaped beads 141 of the second plate 140. [

The island-shaped beads 111 and 141 are, for example, in a rectangular or square shape in a plan view, but needless to say.

The second plate 140 is located between the first plate 110 and the third plate 170 and functions to seal the battery module (not shown) by engaging with a pack cover (not shown). In other words, the packing cover is not bonded to the first plate 110 made of two members but is joined using the second plate 140 made of one unit member, thereby providing a high degree of sealing.

To this end, the second plate 140 includes a seal to which the pack cover is coupled. The sealing part includes an outer protruding part 144 protruding upward at a predetermined height and width along the outer periphery of the upper surface of the second plate 140. The outer circumferential protruding part 144 of the outer circumferential protruding part 144, And the third plate 170 can be fixed to the second plate 140 by tightly fixing the end portions.

The third plate 170 includes a first plate member 172 extending in a first direction I and being rectangular in plan view and a second plate member 172 extending in a second direction II perpendicular to the first direction, And a second plate member 176 having a rectangular shape. The first plate member 172 and the second plate member 176 are vertically coupled on the same plane to form a T-shape.

In addition, the third plate 170 includes first to third module mounting portions 173, 174 and 177 capable of mounting at least one battery module.

(Not shown) fixed to the first and second module mounting portions 173 and 174 are fixed to the second module mounting portion 174 and the third module mounting portion 177 The battery modules are arranged in the same direction. A more detailed description of the second plate 140 and the third plate 170 will be given later.

The first plate 110 corresponds to the third plate member 112 corresponding to the first plate member 172 of the third plate 170 and the second plate member 176 corresponding to the third plate 170 And the third plate member 112 and the fourth plate member 116 are vertically coupled on the same plane to form a T-shape.

The first plate 110 is directly coupled to the frame of the vehicle and has a thickness greater than that of the second and third plates 140 and 170 to support the battery module.

3 is a perspective view schematically showing a structure of a second plate of a base plate for a battery pack according to an embodiment of the present invention.

Referring to FIG. 3, the second plate 140 is formed of one T-shaped plate member, unlike the first and third plates 110 and 170. This is because the second plate 140 functions to seal the battery module by engaging with the pack cover, thereby eliminating voids through which external substances can penetrate. In addition, since the second plate 140 is relatively thinner than the first plate 110, it is easy to manufacture the first plate 110 as a unit.

In order to improve the strength, the second plate 140 is provided with island-shaped beads having a downward indentation shape corresponding to the upwardly projecting island-shaped beads 111 formed on the first plate 110 shown in FIG. (Not shown).

A fixing hole 149 for a cooling member is formed in the island-shaped bead 141 of the second plate 140. The fixing holes for the cooling members are not necessarily formed on all of the island-shaped beads 141 of the second plate 140, but may vary depending on the design of the structure.

2, the fixing hole 149 for the cooling member formed on the second plate 140 corresponds to the position of the fastening protrusion 179 formed on the first plate 110. As shown in Fig. Accordingly, the cooling member can be coupled through the fixing hole 149 for the cooling member and the fastening protrusion 179 through the coupling member.

As described above, the second plate 140 has a sealing portion formed along the outer periphery of the upper surface. Such a seal includes a sealing gasket 146 interposed at the interface with a pack cover (not shown). The sealing gasket 146 may be formed of a rubber material and functions as a rubber packing.

In addition, the sealing portion is formed with the outer circumferential projection 144 protruding upward with a predetermined height and width, and a step is formed by a predetermined height from the inside of the sealing portion. Accordingly, the third plate 170 described above is closely attached to the inner side of the outer circumferential projection 144. The third plate 170 is formed at a height that can be fitted to the height of the outer circumferential projection 144.

The second plate 140 is formed with second fixing holes 147 to be fixed to an external device together with the first plate 110. The second fixing holes 147 are formed apart from the wings 148 extending in the outward direction of the sealing portion. And is spaced apart from the periphery of the sealing portion in the outer direction of the sealing portion.

4 is a perspective view schematically showing a structure of a third plate of a base plate for a battery pack according to an embodiment of the present invention.

4, the third plate 170 includes a first plate member 172 that extends in a first direction and is rectangular in plan view, a second plate member 172 that extends in a second direction perpendicular to the first direction, And the first plate member 172 and the second plate member 176 are vertically coupled on the same plane to form a T-shape.

The first plate member 172 and the second plate member 176 are coupled to form a T shape so that the first plate member 172 extends in the first direction and the second plate member 176 extends in the first direction, And extend in the second direction.

Accordingly, the first plate member 172 and the second plate member 176 may be formed to have different widths with respect to the longitudinal direction of the vehicle, or may be formed with the rectangular plate members having different widths joined together .

The third plate 170 includes first to third module mounting portions 173, 174, and 177. The direction of arrangement of the battery modules fixed to the first and second module mounting portions 173 and 174 is different from that of the battery modules mounted to the second module mounting portion 174 and the third module mounting portion 177, Are the same.

The first plate member 172 of the third plate 170 includes a pair of first module mounting portions 173 located opposite to each other in the first direction. Also included is a second module mounting portion 174 located between the first module mounting portions 173 and having a different battery module orientation than the battery module orientation of the first module mounting portion 173. That is, a pair of first module mounting portions 173 are symmetrically positioned on both sides of the first plate member 172, and a second module mounting portion 174 is formed between the first module mounting portions 173 .

5 is a perspective view schematically showing a state where a fixing member is coupled to a third plate of a base plate for a battery pack according to an embodiment of the present invention.

Referring to FIG. 5, first fixing members 185a, 185b, 185c, and 185d for fixing the battery modules are coupled to the third plate 170. As shown in FIG. The first fixing members 185a, 185b, 185c, and 185d are sort of end plates that fix the battery modules on the third plate 170 in close contact with each other at both ends.

6 is an exploded perspective view illustrating a state where a cooling member is mounted on a base plate for a battery pack according to an embodiment of the present invention.

6, the cooling member includes heat sinks 190a, 190b, 190c, and 190d formed in a shape corresponding to the first through third module mounting portions 173, 174, and 177, And cooling passages 192a and 192b for supplying the coolant to the cooling passages 190a, 190b, 190c and 190d.

Each of the heat sinks 190a, 190b, 190c, and 190d is formed in a hollow plate-like structure. The heat sinks 190a, 190b, 190c, Holes are formed.

7 is a perspective view illustrating a state in which a battery module is mounted on a base plate for a battery pack according to an embodiment of the present invention.

5 and 7, a plurality of battery modules 194, 195, 196, and 197 arranged in different directions are mounted on the base plate. The plurality of battery modules 194, 195, 196, and 197 are fixed in the vertical direction through the first fixing members 190a, 190b, 190c, and 190d described above and the second fixing members 184, do.

The battery modules 194 and 195 are arranged in a row in the first direction and the battery modules 196 and 197 are disposed in the second module mounting portion 174 and the third module mounting portion 177. [ Are arranged in a line in the first direction. As a result, the battery modules 194, 195, 196, and 197 are disposed in different first and second directions.

FIG. 8 is a perspective view illustrating a battery pack with a base plate for a battery pack and a pack cover according to an embodiment of the present invention. FIG. Referring to FIG. 8, the pack cover 198 is coupled to the upper portion of the base plate 100 for a battery pack having a three-layer laminated structure according to an embodiment of the present invention, It is possible to prevent penetration of the substance of

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 (19)

A battery pack comprising: a base plate having a plurality of battery modules mounted thereon and coupled with a pack cover to constitute a battery pack,
A first plate fixed to the external device and supporting a load of the battery modules;
A second plate positioned on the first plate and having a sealing portion to which the pack cover is coupled to seal the battery modules from the outside; And
A third plate positioned on the second plate and having one or more module mounting portions for mounting the battery module;
, ≪ / RTI >
Wherein the first plate, the second plate, and the third plate are closely stacked in the vertical direction. The apparatus of claim 1, wherein the third plate comprises:
A first plate member extending in a first direction and being rectangular in plan view; And
A second plate-shaped member extending in a second direction perpendicular to the first direction and being rectangular in plan view;
And,
Wherein the first plate-shaped member and the second plate-shaped member are vertically coupled on the same plane to form a T-shape. The battery module according to claim 1, wherein the module mounting portion of the third plate has a frame structure in which an opening is formed at the center while supporting a lower outer peripheral edge of the battery module, Wherein the module is mounted on the base plate. 3. The battery module according to claim 2, wherein the first plate-shaped member includes: a pair of first module mounting portions positioned on opposite sides in a first direction; and a pair of second module mounting portions located between the first module mounting portions, And a second module mounting portion of a different battery module orientation. The base plate for a battery pack according to claim 4, wherein the second plate-shaped member of the third plate includes a third module mounting portion of the same battery module orientation as the second module mounting portion. The base plate for a battery pack according to claim 1, wherein the third plate is formed with upwardly projecting fastening protrusions for mounting and fixing the battery module. The base plate for a battery pack according to claim 1, wherein the first plate and the second plate each have an island-shaped bead formed in an upward protruding structure or a downwardly indented structure. [8] The method of claim 7, wherein the first plate is formed with island-shaped beads having upward protruding structures, and the second plate is formed with island-shaped beads having a downward indentation structure, Wherein the first plate and the second plate face each other with the island-shaped beads of the two plates facing each other. The base plate for a battery pack according to claim 1, wherein the sealing portion includes an outer protruding portion protruding upward at a predetermined height and width along the outer periphery of the upper surface of the second plate. The base plate for a battery pack according to claim 9, wherein the sealing portion further comprises a sealing gasket interposed at an interface with the pack cover when the pack cover is engaged with the outer peripheral projection. The base plate for a battery pack according to claim 9, wherein an outer peripheral end of the third plate is closely fixed to the inner side of the outer peripheral projection. 3. The method of claim 2,
A pair of outwardly protruding first fastening portions are formed at an end of the second plate member coupled to the first plate member,
The first plate-shaped member is provided with downwardly recessed second fastening portions at positions corresponding to the first fastening portions,
Wherein the first fastening portions are coupled to each other by spot welding in a state of being accommodated in the second fastening portions. 3. The apparatus of claim 2,
A third plate member corresponding to the first plate member of the third plate; And
A fourth plate member corresponding to the second plate member of the third plate;
And,
Wherein the third plate member and the fourth plate member are vertically coupled to each other on the same plane to form a T-shape. The base plate for a battery pack according to claim 13, wherein the material of the first plate is relatively stiffer than the material of the third plate. [2] The base plate for a battery pack according to claim 1, wherein the first plate and the second plate have a plurality of fixing holes for engaging with external devices on the outer periphery of each of the first plate and the second plate. 16. The method of claim 15,
The fixing holes of the first plate are formed on the island-shaped beads having the upward protruding structure,
And the fixing holes of the second plate are formed at a portion extending outward from the sealing portion. The base plate for a battery pack according to claim 1, wherein the third plate is provided with at least one stud bolt on which a control member for controlling the operation of the battery modules can be mounted and fixed. The battery pack according to any one of claims 1 to 17, wherein the battery modules are mounted on the base plate and the pack covers are coupled. A device according to claim 18, wherein the battery pack is mounted.

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