KR20130110951A - Battery pack of compact structure - Google Patents

Abstract

PURPOSE: A battery pack is provided to be easily assembled and to have a compact and stable structure by fixing battery modules to a base plate, a side support unit, and a strap unit. CONSTITUTION: A battery pack (200) comprises battery modules (30) in which unit modules (20) including battery cells are laminated up and down; a base plate (110); a base plate (110) on which the battery modules are mounted; a front support member (120) and a back support member (130) mounted to the front side and back side of the battery modules; a side support member (140) coupled onto the base plate; and a strap element (150) which surrounds the upper side and both sides of the battery modules to fix the location of the battery modules.

Description

A battery pack having a compact structure (Battery Pack of Compact Structure)

The present invention relates to a battery pack having a compact structure, and more particularly, battery modules having a structure in which unit modules including battery cells are stacked up and down, a base plate on which battery modules are mounted on an upper surface, and electrodes of battery cells. On the base plate, the front support member and the rear support member respectively mounted on the front and rear of the battery modules based on the terminal direction, and the one side of the battery modules forming the outer surface of the battery pack and a part of the front and rear surfaces of the battery pack are wrapped on the base plate. It relates to a battery pack including a side support member to be coupled, and at least one strap member coupled to the base plate while surrounding the upper surface and both sides of the battery module for fixing or mounting the position of the battery module.

BACKGROUND ART [0002] In recent years, rechargeable secondary batteries have been widely used as energy sources for wireless mobile devices. The secondary battery is also attracting attention as a power source for an electric vehicle (EV) and a hybrid electric vehicle (HEV), which are proposed as solutions for the air pollution of existing gasoline vehicles and diesel vehicles using fossil fuels .

Small or mobile devices use one or two or four battery cells per device, whereas medium and large devices use medium and large battery packs electrically connected to a plurality of battery cells due to the need for high output and large capacity.

Since the middle- or large-sized battery pack is preferably manufactured in a small size and weight, a prismatic battery, a pouch-type battery, and the like, which can be charged with a high degree of integration and have a small weight to capacity, are mainly used as battery cells of a middle- or large-sized battery pack. In particular, a pouch-shaped battery using an aluminum laminate sheet or the like as an exterior member has attracted a great deal of attention recently due to its advantages such as small weight, low manufacturing cost, and easy shape deformation.

In addition, in order for the middle- or large-sized battery pack to provide the output and capacity required for a predetermined device or device, a plurality of battery cells must be electrically connected in series or in series and parallel manner and a stable structure against external force must be maintained .

In general, the battery pack is fixed to the base plate (base plate) in order to ensure the dynamic stability, using a member such as end plate (support plate) for the appropriate number of battery modules It is manufactured by.

However, the battery pack having the above structure has a lot of space constraints in mounting the battery modules, and when a large number of battery modules are configured together, there is a problem that the structural stability of the overall battery pack is degraded.

In addition, in the conventional battery pack, in order to secure the dynamic stability of the battery modules to the base plate by bolts or nuts to prevent movement in the vertical direction, it is configured in the form of fixing the longitudinal direction through the end plate and the support beam.

However, since the battery pack having the above structure is mounted on the base plate by using a plurality of fastening members such as bolts and nuts, the assembly process is troublesome and the space for the fastening member is secured. And has a weight restriction of the fastening members.

Therefore, a battery pack having a compact structure that can solve the above problems is very necessary.

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.

Specifically, an object of the present invention is to provide a battery pack of a light weight while simplifying the assembly process, and compact as a whole by a novel fastening structure for fixing the battery modules.

According to an aspect of the present invention, there is provided a battery pack comprising:

Two or more battery modules having a structure in which unit modules including two or more battery cells are stacked up and down;

A base plate on which the battery modules are mounted;

A front support member and a rear support member respectively mounted on the front and rear of the battery modules based on the direction of the electrode terminal of the battery cell;

A side support member coupled to the base plate in a structure surrounding one side of the battery modules forming an outer surface of the battery pack and a portion of the front and rear surfaces of the battery pack; And

At least one strap member coupled to the base plate while surrounding the top and side surfaces of the battery modules to fix or mount the battery modules;

As shown in FIG.

That is, the battery pack of the present invention, each of the battery module is fixed to a specific base plate, front and rear support members, side support members, strap members, etc., it requires a large number of members for fastening the battery module and the battery pack to each other Compared with the conventional fastening structure for performing welding for coupling, assembling is improved, and the overall size of the battery pack is reduced to achieve a more compact and stable battery pack structure.

The unit module may vary, and preferably, an outer surface of two or more battery cells electrically connected may be formed in a structure surrounded by a cell cover.

The battery module may also have various structures. For example, the battery module may have a structure in which a cartridge surrounds both sides or both sides and front and rear surfaces of two or more unit modules stacked up and down.

In one preferred example, two or more battery modules include two module assemblies each arranged in a longitudinal direction in the electrode terminal direction, the module assemblies may be a structure arranged at a distance apart in the horizontal direction.

In the above structure, the side support member may be mounted to each module assembly in a structure surrounding the one side of the module assembly forming the outer surface of the battery pack and the front and rear surfaces of the battery pack. That is, when configuring the battery pack including the side support member, by combining with the strap member to facilitate the fixing and mounting of the battery module, it is possible to ensure the overall structural stability.

Meanwhile, external input / output terminals may be preferably located on the front support member or the rear support member.

In another preferred embodiment, a through hole through which a fastening member for fixing the battery module is inserted in a position corresponding to the strap member in the base plate may be formed, thereby stably coupling the base plate and the strap member.

The fastening member is not particularly limited as long as the parts can easily achieve mutual fastening, and may be, for example, fastening screws or bolts. Such a fastening member is preferable because it can more firmly achieve the coupling of the base plate, the strap member and the battery module.

On the other hand, the corresponding side of the battery module on which the strap member is mounted may have a structure in which a fastening protrusion is formed. Therefore, the strap member can be easily and stably positioned, and the shock can be minimized to be directly transmitted to the battery module during an external shock.

Preferably, a fastener for fastening the strap member may be formed in the center of the fastening protrusion, so that the fastening member may be inserted into the fastener to be engaged in a state where the strap member is positioned on the fastening protrusion.

With the above structure, of course, the strap member is also coupled to the side support member.

In one preferred example, the strap member may have a structure coupled to the upper surface of the base plate while surrounding both sides and the top surface of the battery module. Therefore, the assembly can be easily performed, and as a result, the space of the battery pack can be optimized, and the weight of the battery pack can be reduced.

In the battery pack according to the present invention, a plurality of slits are formed in the side support member so that the coolant can be circulated in the side support member so that high cooling efficiency can be exerted by surrounding air without a separate heat dissipation member. It may be made of a structure.

Meanwhile, the bus bar assembly cover may be additionally mounted on the top of the battery module while the strap member is mounted.

The present invention also provides a device including the battery pack.

The device may preferably be a power storage device or a carrier repeater, but the scope of application is not limited thereto.

As described above, the battery pack according to the present invention, by fixing the respective battery modules to the base plate, the side support member and the strap member, to facilitate the assembly of the battery pack, to achieve a more compact and stable battery pack structure can do.

1 is a perspective view of a battery pack according to the present invention;
2 is a partial perspective view of the battery pack of FIG. 1;
3 is a schematic view of the battery module assembly, the side support member and the strap member of Figure 2;
4 is a side view of FIG. 3;
5 is a schematic diagram in which a bus bar assembly is mounted on the battery module assembly of FIG. 1;
6 is a schematic view of the battery modules of Figure 5 combined with the base plate, the front support member and the side support member.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings, but the present invention is not limited by the scope of the present invention.

1 is a perspective view schematically showing a battery pack according to an embodiment of the present invention, Figure 2 is a partial perspective view of the battery pack of Figure 1 schematically, Figure 3 is a battery of Figure 2 A schematic view of the module assembly, the side support member and the strap member is shown and the side view of FIG. 3 is shown in FIG. 4.

Referring to these drawings, the battery pack 200 includes the battery modules 30, the base plate 110, the front support member 120 and the rear support member 130, the side support member 140, and the plurality of strap members. Field 150 is included.

The battery module 30 has a structure in which the unit modules 20 including the plurality of battery cells 10 are stacked up and down, and the unit module 20 includes a plurality of battery cells electrically connected thereto. The outer surface of 10 has a structure wrapped by the cell cover 11. Since the battery cell 10 is wrapped by the cell cover 11, the battery cell 10 is not exposed to the outside, and thus, the battery cell 10 is represented by a dotted line in the drawing.

The battery module 30 has a structure in which the cartridge 21 surrounds both side surfaces and front and rear surfaces of the unit modules 20 stacked up and down.

In addition, the two battery modules 30 are arranged in the longitudinal direction in the electrode terminal direction (A) to form one module assembly 100, two module assemblies 100 in such a distance distance (L) in the horizontal direction ) Are arranged.

The battery modules 30 are mounted on the upper surface of the base plate 110.

The front support member 120 and the rear support member 130 are mounted on the front and rear surfaces of the battery modules 30 based on the electrode terminal direction A of the battery cell 10, respectively. External input / output terminals 135 are positioned on the rear support member 130.

The side support member 140 is coupled to the base plate 110 in a structure surrounding one side of the battery modules 30 forming the outer surface of the battery pack 200 and a part of the front and rear surfaces of the battery pack 200. .

The side support member 140 is mounted to each module assembly 100 in a structure surrounding one side of the module assembly 100 forming the outer surface of the battery pack 200 and a portion of the front and rear surfaces of the battery pack 200. have.

In addition, the side support member 140 is formed with a plurality of slits 145 through which the refrigerant can flow.

The plurality of strap members 150 are coupled to the base plate 110 while surrounding the top and both sides of the battery modules 30 for fixing or mounting the positions of the battery modules 30.

In the base plate 110, a through hole 115 into which the fastening screw 205 for fixing the battery module 30 is inserted is formed at a position corresponding to the strap member 150.

FIG. 5 is a schematic diagram illustrating a bus bar assembly mounted on the battery module assembly of FIG. 1, and FIG. 6 is a schematic diagram illustrating the battery modules of FIG. 5 coupled with a base plate, a front support member, and a side support member. .

1 through 4, a fastening protrusion 105 is formed at a corresponding side surface of the battery module 30 on which the strap member 150 is mounted, and a strap member is formed at the center of the fastening protrusion 105. A fastener 107 for fastening the 150 is formed.

The strap member 150 is also coupled to the side support member 140.

The strap member 150 is formed in a structure that is coupled to the upper surface of the base plate 110 while surrounding both sides and the top surface of the battery module 30, it can be easily assembled, with a very compact structure The battery pack can be configured.

Meanwhile, the bus bar assembly cover 220 is mounted on the top of the battery module 30 in a state in which the strap member 150 is mounted.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (16)

Two or more battery modules having a structure in which unit modules including two or more battery cells are stacked up and down;
A base plate on which the battery modules are mounted;
A front support member and a rear support member respectively mounted on the front and rear of the battery modules based on the direction of the electrode terminal of the battery cell;
A side support member coupled to the base plate in a structure surrounding one side of the battery modules forming an outer surface of the battery pack and a portion of the front and rear surfaces of the battery pack; And
At least one strap member coupled to the base plate while surrounding the top and side surfaces of the battery modules to fix or mount the battery modules;
A battery pack comprising a. The battery pack as claimed in claim 1, wherein the unit module has a structure in which outer surfaces of two or more battery cells electrically connected are surrounded by a cell cover. The battery pack according to claim 1, wherein the battery module has a structure in which a cartridge surrounds both sides or both sides and front and rear surfaces of two or more unit modules stacked vertically. The battery pack according to claim 1, wherein two or more battery modules include two module assemblies arranged in a longitudinal direction in an electrode terminal direction, and the module assemblies are arranged at a distance apart in a lateral direction. The battery pack according to claim 4, wherein the side support members are mounted on the respective module assemblies with a structure that surrounds one side of the module assembly forming the outer surface of the battery pack and a part of the front and rear sides of the battery pack. The battery pack as claimed in claim 1, wherein external input / output terminals are positioned on the front support member or the rear support member. The battery pack as claimed in claim 1, wherein a through hole into which the fastening member for fixing the battery module is inserted is formed at a position corresponding to the strap member on the base plate. The battery pack according to claim 7, wherein the fastening member is a fastening screw or bolt. The battery pack according to claim 1, wherein a fastening protrusion is formed on a corresponding side surface of the battery module on which the strap member is mounted. The battery pack according to claim 9, wherein a fastener for fastening a strap member is formed at the center of the fastening protrusion. The battery pack as claimed in claim 1, wherein the strap member is coupled to the side support member. The battery pack as claimed in claim 1, wherein the strap member is coupled to an upper surface of the base plate while surrounding both side surfaces and the top surface of the battery module. The battery pack as claimed in claim 1, wherein the side support member has a plurality of slits through which the refrigerant can flow. The battery pack as claimed in claim 1, wherein a bus bar assembly cover is additionally mounted on an upper end of the battery module while the strap member is mounted. A device comprising a battery pack according to any one of claims 1 to 14. 16. The device of claim 15, wherein the device is a power storage device or a carrier repeater.

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