KR20190005405A - Battery Module - Google Patents

Abstract

The present invention discloses a battery pack that is easy to assemble a cell assembly and a pack housing and reduces manufacturing cost. To this end, the battery pack according to an aspect of the present invention comprises a cell assembly including a plurality of secondary batteries; and a pack housing having an internal space for receiving the cell assembly. At least one or more protrusion parts protruding inward are formed on the inner surface of the pack housing. At least one slot into which the protrusion parts are inserted is formed on the outer surface of the cell assembly.

Description

A battery module {Battery Module}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack that accommodates two or more secondary batteries, and more particularly, to a battery pack having a battery pack having a fastening structure for guiding the mounting of the cell assembly in a pack housing, And cars.

The secondary rechargeable batteries are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have almost no memory effect compared to nickel- It is very popular because of its low self-discharge rate and high energy density.

These lithium secondary batteries mainly use a lithium-based oxide and a carbonaceous material as a cathode active material and an anode active material, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate each coated with such a positive electrode active material and a negative electrode active material are disposed with a separator interposed therebetween, and an outer cover material, that is, a battery pouch outer cover material, which encapsulates the electrode assembly together with the electrolyte solution.

Generally, a lithium secondary battery can be classified into a can type secondary battery in which an electrode assembly is embedded in a metal can, and a pouch type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the casing.

In recent years, secondary batteries are widely used not only in small-sized devices such as portable electronic devices, but also in medium- and large-sized devices such as automobiles and electric power storage devices. When used in such a medium to large-sized apparatus, a large number of secondary batteries are electrically connected to increase capacity and output. In particular, pouch-type secondary batteries are widely used because they are easy to laminate in such a middle- or large-sized apparatus.

Conventionally, when a plurality of secondary cells are electrically connected to each other to form a battery pack, it is common to construct a cell assembly composed of a plurality of secondary cells first, and to mount the cell assembly in a pack housing to manufacture a battery pack .

However, in the case of a battery pack used in an automobile or the like, external vibrations or shocks can be frequently transmitted to a battery pack mounted on a vehicle during operation of the vehicle, so that a cell assembly can flow inside the pack housing, The flow of the assembly may cause a problem of damaging the configurations of the battery pack, such as disconnection of the electrical connection between the electrode terminal of the cell assembly and the external input / output terminal of the battery pack.

Therefore, in the prior art battery pack, a fastening structure is provided to prevent the flow of the cell assembly mounted in the pack housing. Such a fastening structure uses a method of restricting the movement of the cell assembly in the pack housing in such a manner that a plurality of bolts pass through both the pack housing and the cell assembly to exert a clamping force.

However, the fastening structure using such a bolt has problems such that the material cost is increased due to the addition of the bolt member, the manufacturing cost of the battery pack, such as the time required for assembling the bolt to fix the cell assembly in the pack housing, There has been a problem of increase.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a battery pack and an automobile having a fastening structure capable of preventing a flow of a cell assembly mounted in a pack housing while reducing manufacturing cost, .

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to an aspect of the present invention, there is provided a battery pack comprising: a cell assembly including a plurality of secondary batteries; And a pack housing having an inner space for receiving the cell assembly.

At least one or more protrusions protruding inward are formed on the inner surface of the pack housing, and at least one or more slots through which the protrusions are inserted may be formed on an outer surface of the cell assembly.

The cell assembly may include a cartridge assembly having secondary batteries stacked in one direction and configured to surround the side surfaces of the stacked secondary batteries.

Moreover, at least one or more protrusions may be formed on the outer surface of the cartridge assembly, and the protrusions may be formed at positions corresponding to the slots at the inner surface of the pack housing.

The slot may have a concave groove shape extending in the vertical direction so as to cover at least a part of the outer surface of the protrusion so that the protrusion is inserted and coupled.

At least one pressing structure for pressing and fixing the outer surface of the protrusion may be formed on the inner surface of the slot.

The pressing structure may include a pressing protrusion protruding in a direction in which the protrusion is located.

Here, the protruding height of the pressing protrusion may have a portion continuously increasing in a direction in which the protruding portion is inserted into the slot.

Furthermore, a groove may be formed on the outer surface of the protrusion so that at least a part of the pressing protrusion formed in the slot can be inserted and fixed.

On the other hand, the cartridge assembly includes: an upper cartridge configured to surround an upper side of the cell stack; And a lower cartridge configured to enclose a lower side surface of the cell stack body.

In addition, at least one of the slots may be formed on the outer surface of the upper cartridge and the lower cartridge.

Further, the pack housing includes: an upper case covering the upper portion of the cell assembly; And a lower case covering the lower portion of the cell assembly.

At least one or more protrusions may be formed on inner surfaces of the upper case and the lower case.

Further, the projecting portion of the upper case may include a support portion formed by being protruded downward from the inner surface of the upper portion of the upper case; And a column portion protruding downward from the lower surface of the support portion along the inner surface of the upper case.

Further, the projecting portion of the lower case may include: a support portion formed in an upward direction from a lower surface of the lower case; And a column portion protruding upward from the upper surface of the support portion along the inner surface of the lower case.

At least one fixing protrusion for pressing the inner wall of the slot may be formed in at least one of the side surfaces of the column portion.

Also, the fixing protrusion may have a portion where the protruded height continuously increases in a direction in which the supporting portion is located.

Meanwhile, a plurality of ribs may be formed on the inner surface of the pack housing to support the outer surface of the mounted cell assembly.

In addition, the rib may protrude from the inner surface of the pack housing and extend linearly.

Furthermore, at least one rib projection may be formed on a part of the rib facing the cell assembly.

At least two of the rib projections may be formed at positions opposite to each other with respect to the cell assembly.

According to another aspect of the present invention, there is provided a vehicle including the battery pack according to the present invention.

According to an aspect of the present invention, a slot formed on an outer surface of the cell assembly is engaged with a protrusion formed on an inner surface of the pack housing in a direction in which the cell assembly is received, so that the battery pack is slidably inserted into the battery pack. Sufficient force to prevent flow into the pack housing of the cell assembly can be exhibited.

Thus, the present invention can prevent the cell assembly or the pack housing provided in the battery pack from being damaged even if an external shock or vibration is applied to the battery pack without adding additional fastening members.

Particularly, in the case of a battery pack for an automobile, the battery pack according to the present invention can be frequently exposed to vibrations and shocks due to its environmental characteristics. In addition, Can be applied.

According to an aspect of the present invention, the protrusions and the slots, respectively, provided in the cell assembly and the pack housing can serve as guides in assembling the cell assembly and the pack housing.

Therefore, according to this aspect of the present invention, when the protrusions provided on both sides are accommodated in the slots formed in the outer surface of the cell assembly when the protrusions are accommodated in the inner space of the pack housing, the storage positions are precisely adjusted. There is no need to make a large effort to match, and the defect rate due to assembly mistakes can be reduced.

Further, according to this aspect of the present invention, the pack housing is formed with a rib having a linearly extending structure, and the rib effectively improves the rigidity of the pack housing, thereby ultimately enhancing the durability of the battery pack.

In addition, according to one aspect of the present invention, the ribs are provided on the linear ribs formed on the pack housing, so that the cell assembly can be effectively restrained so as to prevent the flow of the cell assembly in which the pack housing is mounted.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
1 is a perspective view schematically showing a battery pack according to an embodiment of the present invention.
2 is a perspective view showing an upper case, which is a part of the battery pack of FIG.
3 is a perspective view showing a lower case which is a part of the battery pack of FIG.
4 is a perspective view showing a cell assembly which is a part of the battery pack of FIG.
FIG. 5 is a perspective view showing stacked secondary batteries which are a part of the battery pack of FIG. 1;
6 is a partially enlarged view of an enlarged slot configuration on the left side of the cell assembly of Fig.
7 is a plan view (a) and a side view (b) of a lower cartridge of a cell assembly according to an embodiment of the present invention.
8 is a plan view (a) and a side view (b) of an upper cartridge of a cell assembly according to an embodiment of the present invention.
9 is a plan view showing an upper case, which is a part of the cell assembly of FIG.
10 is a plan view showing a lower case which is a part of the cell assembly of FIG.
11 is a cross-sectional view showing one embodiment of a cross section taken along the line AA 'of the C region of the lower case of Fig.
12 is a perspective view showing protrusions of a pack housing according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, and the inventor should appropriately interpret the concept of the term appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

1 is a perspective view schematically showing a battery pack according to an embodiment of the present invention. 2 is a perspective view showing an upper case, which is a part of the battery pack of FIG. 3 is a perspective view showing a lower case which is a part of the battery pack of FIG. 4 is a perspective view showing a cell assembly which is a part of the battery pack of FIG. 5 is a perspective view illustrating stacked secondary batteries which are a part of the battery pack of FIG.

1 to 5, a battery pack 400 according to the present invention may include a cell assembly 200 and a pack housing 300.

The cell assembly 200 may include a plurality of secondary batteries 100.

At this time, the secondary battery 100 may be a pouch type secondary battery 100. In particular, the pouch type secondary battery 100 may include an electrode assembly, an electrolyte, and a pouch outer cover material.

Here, the electrode assembly may be configured such that at least one positive electrode plate and at least one negative electrode plate are disposed with the separator interposed therebetween. More specifically, the electrode assembly can be divided into a winding type in which one positive electrode plate and one negative electrode plate are wound together with a separator, and a stacked type in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked with a separator interposed therebetween .

Further, the pouch exterior member may be configured in the form of an external insulating layer, a metal layer, and an internal adhesive layer. Such a pouch case may be formed of a metal thin film, such as an aluminum thin film, in order to protect internal components such as an electrode assembly and an electrolyte, and to complement the electrochemical properties of the electrode assembly and the electrolyte, have. In order to ensure electrical insulation between the internal components of the secondary battery 100 such as the electrode assembly and the electrolytic solution, and other components outside the secondary battery 100, the aluminum thin film is disposed between the insulating layers formed of the insulating material Can be intervened.

Particularly, the pouch exterior member can be composed of two pouches, and at least one of them can be formed with a concave internal space. The electrode assembly can be housed in the inner space of the pouch. In addition, a sealing portion is provided on the outer circumferential surface of the two pouches, and these sealing portions are fused to each other, so that the internal space accommodating the electrode assembly can be sealed.

Each of the pouch type secondary batteries 100 may include electrode leads 111 and 112 and the positive electrode lead 111 and the negative electrode lead 112 may be included in the electrode leads 111 and 112. Here, each of the electrode leads 111 and 112 is formed in a plate shape, and can be arranged so as to lie approximately parallel to the ground when viewed in the direction F, and two broad surfaces are respectively located at upper and lower portions .

More specifically, the electrode leads 111 and 112 may be configured to protrude forward or backward from a sealing portion located on the outer periphery of the front or rear of the pouch outer casing. These electrode leads 111 and 112 can function as electrode terminals of the secondary battery 100. [

For example, as shown in FIG. 5, one electrode lead 111 may protrude from one side of one side of the sealing portion of the secondary battery 100, and the other electrode lead 112 may be formed And may protrude from the electrode lead 111 and protrude from the other side of the sealing portion.

The configuration of the above-described pouch-type secondary battery 100 is obvious to those skilled in the art, so that a detailed description thereof will be omitted. In addition, various secondary batteries known at the time of filing of the present invention can be employed in the cell assembly 200 according to the present invention.

The pack housing 300 has an empty space in which the cell assembly 200 can be housed. In addition, the pack housing 300 may have an internal space to cover the entire outer surface of the cell assembly 200.

According to this configuration, since the pack housing 300 can serve as a casing for the battery pack 400, it is possible to provide the battery pack 400 with structural stability, And protects the components housed therein, such as the cell assembly 200, from the elements. To this end, the pack housing 300 may be made of a metal such as steel, or may be made of a plastic material of low conductivity.

At least one protrusion 321 protruding inward may be formed on the inner surface of the pack housing 300. 3, the pack housing 300 may have a protrusion 321 on the side surface of the inner space in which the cell assembly 200 is housed. Further, the protrusion 321 may be formed in a shape elongated in a direction perpendicular to the paper surface, that is, in a direction perpendicular to the lower surface of the pack housing 300. And, at least one side of the protrusion can be face-bonded to the side surface of the inner space of the pack housing.

As shown in FIG. 4, at least one slot 213 may be formed on the outer surface of the cell assembly 200.

The slot 213 may include a structure in which the protrusion 321 is inserted in a sliding manner. Specifically, the slot 213 may have an internal structure having a size corresponding to an outer surface of the protrusion so that the protrusion 321 formed in the inside of the pack housing 300 may be inserted.

According to such a configuration, the slot 213 can be engaged with the protrusion 321 formed on the inner surface of the pack housing 300 in the direction in which the cell assembly 200 is housed, and inserted in a sliding manner. In this case, a fixing force sufficient to prevent the cell assembly from flowing into the pack housing can be exerted without a separate fastening member. Therefore, the manufacturing cost of the battery pack can be reduced, and the cell assembly can be easily mounted and fastened to the pack housing without any assembly mistakes, thereby improving the manufacturing efficiency of the battery pack.

In addition, even when an external shock or vibration is applied to the battery pack 400, the cell assembly 200 built in the battery pack 400 can be prevented from flowing inside the pack housing 300, It is possible to prevent the inner structures from being damaged due to the friction between the cell assemblies 200.

According to this structure, the cell assembly 200 can be positively fixed within the pack housing 300 by the structure of the slot 213 and the protrusion 321 of the battery pack 400 of the present invention. Therefore, the battery pack 400 of the present invention can perform the assembling process in which the cell assembly 200 is accommodated in the pack housing 300 and can be fixed to the pack housing 300, Can be minimized.

Further, even if vibration or impact is applied to the battery pack 400 during the battery pack manufacturing process or using the manufactured battery pack 400, since the cell assembly 200 does not move, It is possible to effectively prevent the assembly position of the cell assembly 200 from being disturbed or the battery pack 400 from being damaged.

Referring again to FIGS. 4 and 5, the cell assembly 200 may include secondary batteries 100 stacked in one direction.

Here, the secondary batteries 100 may be stacked in at least one direction. For example, as shown in FIG. 5, six pouch-shaped secondary batteries 100 may be stacked in the vertical direction. At this time, each of the pouch-shaped secondary batteries 100 is arranged such that when viewed in the direction F, the two wide surfaces are located on the upper and lower sides, respectively, and the sealing portions are located on the upper and lower sides, Can be arranged in the form of

On the other hand, terms such as front, back, left, right, top, and bottom may be different depending on the position of the observer or the shape of the object. For the sake of convenience of description, in the present specification, the directions of the front, rear, left, right, top, bottom, and the like are described separately with reference to the view in the F direction.

In addition, the cell assembly 200 may include a cartridge assembly 210 configured to surround a side surface of the stacked secondary batteries 100.

Specifically, the cartridge assembly 210 may have a structure in which at least two cartridges are fastened to each other. Here, the cartridge may be a member for wrapping the outer surface of the at least one secondary battery 100.

Since the cartridge assembly 210 can protect the outer appearance of the stacked secondary batteries 100, the secondary batteries 100 can be stably housed in the battery pack 400, And protects the secondary battery 100 from other external physical factors such as materials. In addition, the cartridge assembly 210 may include a material having elasticity capable of effectively dispersing stress due to volume expansion due to the swelling phenomenon caused by charging and discharging of the secondary battery 100. For example, the cartridge assembly 210 may be made of a plastic material.

 Furthermore, the cartridge can prevent the secondary battery 100 from flowing and prevent the secondary battery 100 from being stacked, thereby guiding the stacking and assembly of the secondary battery 100. Such cartridges can be replaced with various other terms such as a lamination frame, and can be configured in the form of a rectangular ring with an empty central portion. In this case, four corners in the form of a square ring can be respectively located on the outer periphery of the pouch type secondary battery 100.

At least one or more slots 213 and 214 may be formed on the outer surface of the cartridge assembly 210. 4, the slots 213 and 214 correspond to the left and right directions of the outer surface of the cartridge assembly 210 with respect to the front-rear direction in which the electrode leads of the secondary battery 100 are formed The left and right sides of the cartridge assembly 210, as shown in FIG.

3, the protrusion 321 is formed on the inner surface of the pack housing 300 at a position corresponding to the slot 213, so that the cell assembly 200 is inserted into the inside of the pack housing 300 It can be configured to be inserted into the slot 213. [ The protrusion 321 is formed on the left outer surface and the right outer surface of the cartridge assembly 210 in which the slot 213 is formed and the inner surface of the pack housing 300, And a protrusion 321 on the inner surface of the right side.

According to this configuration of the present invention, the protrusion 321 formed on the inner surface of the pack housing 300 may be able to press the outer surface of the cell assembly 200 in the lateral direction. Accordingly, by preventing the cell assembly 200 from flowing in the pack housing 300, it is possible to prevent the structure of the cell assembly 200, particularly the weak structures disposed in front of the cell assembly 200 where the electrode leads of the secondary battery are located, The protection circuit board, the electrode lead, and the like can be avoided.

6 is a partially enlarged view of an enlarged slot configuration on the left side of the cell assembly of Fig.

Referring to FIGS. 4 and 6 together with FIG. 3, the slot 213 may be formed in a concave groove shape so as to cover at least a part of the outer surface of the protrusion 321 so that the protrusion 321 is inserted .

The groove shape of the slot 213 is formed to extend in a direction in which the cell assembly 200 is inserted into the pack housing 300 so that the protrusion 321 formed in the pack housing 300 can be slidably inserted . For example, as shown in FIG. 4, when the cell assembly 200 is accommodated in the upper or lower direction within the pack housing 300, the groove shape of the slot 213 may be long And may be formed in an extended form.

When the protrusion 321 formed on the inner surface of the pack housing 300 is introduced into the slot 213 of the cell assembly 200 according to the present invention, It is possible to insert the cell assembly 200 into the interior accommodating space of the pack housing 300 in the upward or downward direction with the horizontal movement of the assembly 200 restricted. According to this configuration, since the cell assembly can be easily inserted and stored without fear of being housed in a wrong position, the manufacturing process efficiency of the battery pack can be improved.

6, at least one pressing structure 215 for pressing and fixing the outer surface of the protrusion 321 may be formed on the inner surface of the slot 213. As shown in FIG. Specifically, the pressing structure 215 may be a structure for pressing at least a part of the outer surface of the protrusion 321 while the protrusion 321 is inserted into the slot 213. For example, the pressing structure 215 may be formed to protrude outwardly, such as leftward or rightward.

According to this configuration, not only can the cell assembly 200 be restricted from flowing inside the pack housing 300 by the fastening structure of the slot 213 and the protrusion 321, By further pressing the outer surface of at least a part of the protruding portion 321 of the pack housing 300 in the outward direction, the formed pressing structure 215 can exert a stronger binding force.

Specifically, the pressing structure 215 may include a pressing protrusion 216 protruding in a direction in which the protrusion 321 is located. For example, the pressing protrusion 216 may have a spherical, conical, cylindrical, or polygonal prism structure. However, the shape of the pressing protrusion 216 is not limited to such a shape, and it is applicable to a shape that does not easily damage the outer surface of the cell assembly 200.

In addition, the pressing protrusion 216 may be formed in a deformed shape in which a part of the pressed portion is pressed while pressing the outer surface of the protruding portion 321. For example, the pressing protrusion 216 may be configured such that at least a part of the pressing protrusion 216 is pushed inward in the process of inserting the cell assembly 200 into the inside of the pack housing 300. More specifically, in the case of the pressing protrusion 216 located on the left side of the cell assembly 200 in the configuration of FIG. 6, the outer end may be deformed to a thicker width in the forward and backward direction than before being pressed by the protrusion have. Further, the pressing protrusion 216 may have a shape in which the thickness of the outer end of the pressing protrusion 216 is thicker than the thickness of the inner end in a state in which the pressing protrusion 321 is pressed.

Further, the pressing protrusion 216 may be biased to one side of the inner surface of the slot 213. Specifically, the pressing protrusion 216 may be formed on one side of the inner surface of the slot 213 corresponding to the direction in which the protrusion 321 is inserted, and may be formed so as to be in contact with the one side surface . For example, referring to FIG. 6, in the upper pressing structure 215, the pressing protrusion 216 may be located below the pressing structure 215. Further, in the pressing structure 215 located at the lower portion, the pressing protrusion 216 may be located at the upper portion of the pressing structure 215.

The pressing protrusion 216 may have a portion where the protruded height (lateral length) continuously increases in a direction in which the protrusion 321 is inserted into the slot 213. That is, the pressing protrusion 216 may be formed with an inclined surface continuously increasing in height. For example, referring to FIG. 6, in the case of the lower pressing projection 216, at least a part of the pressing projection 216 may be inclined so that the projection height gradually increases toward the upper direction. In addition, in the case of the pressing projection located at the upper portion, the pressing projection may be formed in an inclined shape in which at least a part of the pressing projection gradually increases in height in the downward direction.

According to such a configuration, the protrusion 321 can slide along the inclined surface of the pressing protrusion 216, so that the protrusion 321 can be more easily inserted into the slot 213. A portion of the pushing protrusion 216 having the highest protruding height can press the outer surface of the protrusion 321 with a strong force so that the cell assembly 200 is firmly fitted into the pack housing 300 Can be fixed.

Referring again to FIG. 4, the cell assembly 200 may include an end plate 220 covering upper and lower surfaces of the cell assembly 200. That is, the end plate 220 may be mounted at a position facing the lower surface of the secondary battery 100 positioned at the uppermost or bottommost position of the secondary battery 100 positioned at the uppermost one of the stacked secondary batteries 100.

Furthermore, the end plate 220 is formed in a plate shape having a large area on the top and bottom surfaces, and can cover the top and bottom surfaces of the cell assembly 200, respectively. The end plate 220 provides mechanical rigidity to the cell assembly 200 and protects the cell assembly 200 from external impacts. For this purpose, the end plate 220 may be made of a metal such as steel.

The end plate 220 can be fastened and fixed to the cartridge assembly 210. For example, the end plate 220 may be fixed through a fastening structure such as a bolt or the like with the cartridge assembly 210, or may be fixedly coupled to the cartridge assembly 210 by laser welding or the like.

7 is a plan view (a) and a side view (b) of a lower cartridge of a cell assembly according to an embodiment of the present invention. 8 is a plan view (a) and a side view (b) of an upper cartridge of a cell assembly according to an embodiment of the present invention. 9 is a plan view showing an upper case, which is a part of the cell assembly of FIG. FIG. 10 is a plan view showing a lower case, which is a part of the cell assembly of FIG. 1. FIG.

5-11, the cartridge assembly 210 may include an upper cartridge 211 and a lower cartridge 212.

The upper cartridge 211 may have a structure configured to surround an upper side surface of the stacked secondary batteries 100. Such a structure may be formed in the shape of a rectangular ring having a hollow central portion. In this case, the four corners of the rectangular ring can be respectively located on the outer peripheral portion of the pouch type secondary battery 100.

In addition, the lower cartridge 212 may have a structure configured to surround a lower side surface of the stacked secondary batteries 100. Such a structure may be formed in the shape of a rectangular ring having a hollow central portion. In this case, the four corners of the rectangular ring can be respectively located on the outer peripheral portion of the pouch type secondary battery 100.

In this configuration, at least one or more of the slots 213 and 214 may be formed on the outer surface of the upper cartridge 211 and the lower cartridge 212. 4, two slots 211 and 214 may be formed on both sides of the lower cartridge 212, and two slots 211 and 214 may be formed on both sides of the upper cartridge 211, respectively. have.

The slot 213 may be formed in a groove extending upward from the lower end of the lower cartridge 212 to a predetermined position. The slot 213 may be formed with an inner wall 219 protruding from the most side surface of the lower cartridge 212 so as to fix the protrusion 321 inserted in the upward direction.

Likewise, the slot 214 may be formed as a groove extending downward from the upper end of the upper cartridge 211 to a predetermined position. The slot 214 may be formed with an inner wall 219 protruding from the most side surface of the upper cartridge 211 so as to fix the protrusion 311 inserted in the downward direction.

5 to 11, the pack housing 300 includes an upper case 310 covering an upper portion of the cell assembly 200 and a lower case 320 covering a lower portion of the cell assembly 200. [ . ≪ / RTI >

The upper case 310 may have an internal structure to cover the upper portion of the cell assembly 200 to protect the upper surface of the cell assembly 200. The inner structure may have an inner shape larger than the outer shape of the cell assembly 200. Specifically, the upper case 310 is provided with a ceiling structure in which the upper portion of the cell assembly 200 is inwardly extended in a rectangular shape to cover the upper surface of the rectangular shape of the cell assembly 200.

The lower case 320 may have an internal structure to cover a lower portion of the cell assembly 200 to protect the lower external appearance of the cell assembly 200. The internal structure may include a lower portion of the cell assembly 200, Which is larger than the size of the outer shape of the outer case. Specifically, the lower case 320 is provided with a bottom structure that is inwardly bent in a rectangular shape so as to cover the lower surface of the rectangular shape of the cell assembly 200.

Further, the upper case 310 and the lower case 320 may have a fastening structure for fastening the two members to each other. Specifically, the fastening structure may have a structure in which the upper case 310 is mounted on the lower case 320 in a downward direction, and the upper case 310 and the lower case 320 are fastened to each other .

For example, the fastening structure may be a bolt fastening structure capable of maintaining a fastened state without loosening, or a fastening operation in which the fastening operation is easy and the upper case 310 and the lower case 320 are in contact with each other so as to face each other A male and female fastening structure that can be engaged by a resilient coupling, and the like can be applied. However, the present invention is not necessarily limited to these fastening structures, and a known fastening method can be applied to both the fastening structure of the upper case 310 and the lower case 320.

Referring again to FIG. 3 and FIG. 9 to FIG. 10, at least one or more protrusions 311 and 321 may be formed on inner surfaces of the upper case 310 and the lower case 320, respectively.

Specifically, the protrusion 311 formed on the inner surface of the upper case 310 may be inserted into the slot 214 formed in the upper cartridge 211 in a downward direction and fastened. The protrusion 321 formed on the inner surface of the lower case 320 may be inserted upward in the slot 213 formed in the lower cartridge 212 to be fastened.

More specifically, the protruding portion 311 of the upper case 310 may include a support portion 315 and a pillar portion 317.

Here, the support portion 315 may be protruded downward from the inner upper surface of the upper case 310. For example, the support portion 315 may have a shape such as a circular shape, an elliptical shape, a rectangular shape, or the like, which is planarly protruded downward. As shown in Fig. 9, the four supports 315 may have an oval shape and a downwardly protruding shape.

The column portion 317 may protrude downward from the lower surface of the support portion 315 along the inner surface of the upper case 310. For example, the columnar section 317 may have a circular, oval or rectangular cross section in the horizontal direction. Further, at least one side surface of the column portion 317 may be surface-bonded to the inner surface of the upper case 310. As shown in Fig. 9, the columnar section 317 may have a substantially rectangular cross section in the horizontal direction. The column portion 317 may have a shape in which a rectangular parallelepiped protrudes from the inner surface of the upper case 310.

The protrusion 321 of the lower case 320 may include a support portion 315 and a column portion 317.

Here, the support portion 315 may be formed in an upward direction from an inner bottom surface of the lower case 320. For example, the support portion 315 may have a shape in which a shape such as a circle, an ellipse, or a rectangle is raised in a planar shape upward.

The column portion 317 may protrude upward from the upper surface of the support portion 315 along the inner surface of the lower case 320. For example, the columnar section 317 may have a circular, oval or rectangular cross section in the horizontal direction. Further, at least one side surface of the column portion 317 may be bonded to the inner surface of the lower case 320. As shown in Fig. 10, the columnar section 317 may have a substantially rectangular cross section in the horizontal direction. The column portion 317 may have a shape in which a rectangular parallelepiped protrudes from the inner side surface of the lower case 320.

According to this configuration, it is easy to slidely insert the protrusions 311 and 321 into the slots 213 while the cell assembly 200 is in close contact with the inner surface of the pack housing 300, So that it can be stably fastened.

Also, as shown in FIG. 3, at least one fixing protrusion 313 may be formed on at least one of the side surfaces of the column portion 317.

Specifically, the fixing protrusion 313 may be protruded to a predetermined height so as to press the inner wall of the slots 213 and 214 of the cartridge assembly 210. For example, the fixing protrusions 313 may be configured to protrude forward and backward from the front side surface and the rear side surface of the column portion 317.

The fixing protrusion 313 may be formed to contact the lower end of the column portion 317 in a structure in which the column portion 317 extends in the vertical direction. In other words, the fixing protrusion 313 may be a linear protrusion extending from the supporting portion 315 in the vertical direction along the side surface of the column portion 317.

Further, the fixing protrusion 313 may be formed in a deformed shape in which a part of the upper portion pressed by pressing the inner surface of the slot 213 is pressed. Specifically, the outer end of the fixing protrusion 313, which is pressed on the inner surfaces of the slots 213 and 214 of the cartridge assembly 210, may be deformed to a greater thickness than before being pressed. 3, the fixing protrusions 313 formed on the front side surface of the column portion 317 are formed so that the direction in which the fixing protrusions 313 protrude in the state in which the inner surface of the slot 213 is pressed is defined as a reference The outer end, that is, the thickness of the front end portion may be thicker than the thickness of the rear end portion coupled to the body of the column portion 317.

The fixing protrusion 313 may have a portion where the protruding height (longitudinal length in the drawing) increases continuously in the direction in which the supporting portion 315 is located. That is, the fixing protrusion 313 may be formed with an inclined surface that increases in a direction in which the supporting portion 315 is located. For example, at least a part of the fixing protrusion 313 located in the lower case 320 may be inclined in such a manner that the protrusion height in the forward and backward direction gradually increases toward the lower direction.

According to such a configuration, the slot 213 can slide along the inclined surface of the fixing protrusion 313 and can be fastened to the protrusion 321, and the protruding height of the fixing protrusion 313 is the highest The inner surface of the slot 213 can be pressed with a strong force and a more rigid fastening structure between the protrusion 321 and the slot 213 can be formed.

11 is a cross-sectional view showing one form of a cross section taken along the line A-A 'in the C region of the lower case of Fig.

Referring to FIG. 9 and FIG. 11 together with FIG. 3, a plurality of ribs 330 may be formed on the inner surface of the pack housing 300.

The rib 330 may protrude inward from the inner surface of the pack housing 300 so as to support the outer surface of the cell assembly 200 mounted inside the pack housing 300. Specifically, the ribs 330 may protrude from the inner surface of the pack housing 300 and extend linearly.

More specifically, the rib 330 may be linearly extended from one side of the inside of the pack housing 300 to the other side of the opposite side through the inner bottom surface. As described above, the rigidity can be stably secured from one side of the pack housing 300 to the other side of the pack housing 300 by the structure in which the ribs 330 are formed on the entire inner surface of the pack housing 300.

Particularly, the pack housing 300 may be provided with a plurality of ribs 330. In this case, the rigidity of the pack housing 300 may be uniformly improved. For example, when the lower case 320 is formed in the shape of an opened hexahedron, a plurality of ribs may be provided on each of four sides and one lower surface. In this case, both four side surfaces and one lower surface can secure a uniform overall rigidity. According to such a configuration, the battery pack 400 of the present invention can be prevented or reduced from being damaged, such as a shock applied from the outside or the inside, to the pack housing 300.

In addition, the ribs 330 may be formed so that a plurality of ribs 330 intersect with each other. For example, the ribs 330 may be formed in a lattice shape or in a honeycomb shape. However, the present invention is not limited to such a shape, but may be applied to any shape in which the ribs 330 intersect with each other.

3, 9, and 10, at least one rib protrusion 333 may be formed on a part of the rib 330 facing the cell assembly 200. As shown in FIGS. The rib protrusion 333 is formed on the rib 330 formed on the inner side surface of the pack housing 300 so that the outer surface of the cell assembly 200 mounted inside the pack housing 300 It is possible to press it more strongly.

When the rib protrusion 333 is formed on the upper surface of the pack housing 300 or the rib 330 formed on the inner surface of the pack housing 300, The upper outer surface or the lower outer surface of the assembly 200 can be pressed more strongly.

The rib protrusion 333 may be deformed by pressing the outer surface of the cell assembly 200. Specifically, the outer end of the rib projection 333, which is pressed on the outer surface of the cell assembly 200, may be deformed to a greater thickness than before being pressed. For example, the rib protrusion 333 is formed so that the thickness of the upper end (outer end) is smaller than the thickness of the lower end (inner end) of the cell assembly 200 with respect to the direction in which the rib protrusion 333 protrudes, It can be thicker than thickness.

The rib protrusion 333 protrudes in the direction in which the cell assembly 200 is positioned so as to prevent the flow of the cell assembly 200 in which the pack housing 300 is mounted, The cell assembly 200 can be constrained to the inside of the pack housing 300 by strongly pressing the outer surface of the cell assembly 200.

9 and 10, the rib projections 333 are formed at positions opposite to each other with respect to the other rib projections 333 formed in the pack housing 300 and the cell assemblies 200 .

9, when one rib projection 333 is formed on the rib 330 formed on the inner upper surface of the inner surface of the upper case 310 of the pack housing 300, Another rib protrusion 333 may be formed on the rib 330 formed on the inner lower surface of the inner surface of the lower case 320, which is a position corresponding to each other.

3, when one rib projection 333 is formed on a rib 330 formed on one inner surface of the inner surface of the lower case 320 of the pack housing 300, (Not shown) may be formed on the ribs formed on the inner surface of the other side corresponding to the left and right sides of the rib 320.

According to this configuration of the present invention, the ribs 330 formed at positions corresponding to each other with respect to the cell assembly 200 and the corresponding ribs 333 formed on the ribs 330 are formed in the corresponding Both outer surfaces can be pressed. Therefore, the effect of preventing the cell assembly 200 from flowing inside can be further improved.

12 is a perspective view showing protrusions of a pack housing according to another embodiment of the present invention.

12, the protrusion 341 of the pack housing according to another embodiment of the present invention has a groove portion 343 on the outer surface in comparison with the protrusion portion 321 of the pack housing 300 according to the embodiment of FIG. ) Can be further formed. The groove portion 343 may be formed in such a shape that at least a part of the pressing protrusion 216 formed in the slots 213 and 214 of the pack housing 300 can be inserted and fixed.

For example, in the case where the protrusion 321 is a linear protrusion extending over a part of the pressing protrusion 216 formed in the slot 213 in a certain direction, the linearly recessed groove portion 343 . 12, the groove portion 343 extends in the vertical direction of the projection portion 321 so as to face the pressing projection 216 of the slot 213 of the lower cartridge 212 in Fig. 6 May be formed on the entire surface of the upper end of the pillar portion 347.

The groove portion 343 formed on the outer surface of the protrusion 321 is formed in such a manner that at least a part of the pressing protrusion 216 formed on the outer surface of the slot 213 of the cell assembly 200 is inserted and fixed It is possible to restrict the protrusion 321 from flowing in a state where it is inserted into the slot 213 and ultimately to prevent the flow of the cell assembly 200 more effectively.

The battery pack 400 according to the present invention may include various devices for controlling the charge and discharge of the cell assembly 200 such as a BMS (Battery Management System), a current sensor, a fuse, and the like in addition to the cell assembly 200 .

Also, the battery pack 400 according to the present invention can be applied to an automobile such as an electric car or a hybrid car. That is, the automobile according to the present invention may include the battery pack 400 according to the present invention.

In the present specification, terms indicating upward, downward, leftward, rightward, forward, and backward directions are used, but these terms are for convenience of explanation only and may vary depending on the position of an object or the position of an observer It will be apparent to those skilled in the art that the present invention is not limited thereto.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

400: Battery module
100: secondary battery
200: cell assembly
210: cartridge assembly
211: upper cartridge
212: Lower cartridge
213, 214: Slot
215: Pressurizing structure
216: pressing projection
220: End plate
300: Pack housing
310: upper case
320: Lower case
311, 321:
315: Support
317:
313: Fixing projection
330: rib
333: rib projection

Claims (15)

A cell assembly having a plurality of secondary cells; And
A pack housing having an inner space for housing the cell assembly,
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Wherein at least one protrusion protruding inward is formed on an inner surface of the pack housing, and at least one slot is formed on an outer surface of the cell assembly, into which the protrusion is inserted. The method according to claim 1,
Wherein the cell assembly includes a cartridge assembly including secondary batteries stacked in one direction and configured to surround a side surface of the stacked secondary batteries. 3. The method of claim 2,
Wherein the slot is formed at least on the outer surface of the cartridge assembly,
And the projecting portion is formed at a position corresponding to the slot on the inner surface of the pack housing. The method of claim 3,
The slot has a concave groove shape extending in the vertical direction so as to cover at least a part of the outer surface of the protrusion so that the protrusion is inserted and coupled,
Wherein at least one pressing structure for pressing and fixing the outer surface of the protrusion is formed on the inner surface of the slot. 5. The method of claim 4,
Wherein the pressing structure includes a pressing projection projecting in a direction in which the projection is located,
Wherein the protruding height of the pressing projection has a portion continuously increasing in a direction in which the protruding portion is inserted into the slot. 6. The method of claim 5,
And a groove is formed on an outer surface of the protrusion so that at least a part of the pressing protrusion formed in the slot can be inserted and fixed. The method of claim 3,
The cartridge assembly comprising:
An upper cartridge configured to enclose an upper side of the cell stack; And
A lower cartridge configured to enclose a lower side surface of the cell stack body,
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Wherein at least one of the slots is formed on an outer surface of the upper cartridge and the lower cartridge. The method according to claim 1,
The pack housing includes an upper case covering an upper portion of the cell assembly; And
A lower case covering the lower portion of the cell assembly,
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Wherein at least one of the protrusions is formed on an inner surface of each of the upper case and the lower case. 9. The method of claim 8,
The protruding portion of the upper case,
A support portion formed in an upward direction from an inner surface of the upper portion of the upper case; And
Extending from the lower surface of the support portion along the inner surface of the upper case in a downward direction,
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The protrusion of the lower case
A support portion formed in an upward direction from a lower surface of the lower case; And
And extending from the upper surface of the support portion to the upper side along the inner surface of the lower case,
The battery pack comprising: 10. The method of claim 9,
Wherein at least one of the side surfaces of the column portion is formed with at least one fixing protrusion for pressing an inner side wall of the slot. 11. The method of claim 10,
Wherein the fixing protrusion has a portion in which the protruding height continuously increases in a direction in which the supporting portion is located. The method according to claim 1,
Wherein a plurality of ribs are formed on the inner surface of the pack housing to support the outer surface of the mounted cell assembly. 13. The method of claim 12,
Wherein at least one rib protrusion is formed on a part of the rib facing the cell assembly. The battery pack according to claim 1, wherein the at least one rib protrusion is formed on a part of the rib facing the cell assembly, the rib protruding from the inner surface of the pack housing and extending linearly. 14. The method of claim 13,
Wherein at least two of the rib projections are formed at positions opposite to each other with respect to the cell assembly. An automobile including the battery pack according to any one of claims 1 to 14.

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