KR102267587B1 - Battery Pack - Google Patents

Abstract

The present invention discloses a battery pack capable of preventing the flow of a cell assembly mounted in a pack housing. 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 accommodating space for accommodating the cell assembly therein, an upper case formed to cover an upper portion of the cell assembly, and a lower case formed to cover a lower portion of the cell assembly, wherein A pressing structure is provided on the inner surface of the receiving space of the pack housing that presses the outer surface of the cell assembly and that the protruding height is deformed according to the size of the cell assembly.

Description

Battery Pack {Battery Pack}

The present invention relates to a battery pack having a cell assembly having a plurality of secondary batteries housed therein, and more particularly, to a battery pack having a pressurizing structure to prevent a flow of a cell assembly mounted in a pack housing and a vehicle. is about

Currently commercialized secondary batteries include 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-based secondary batteries, so charging and discharging are free, The self-discharge rate is very low and the energy density is high, attracting attention.

Such a lithium secondary battery mainly uses a lithium-based oxide and a carbon material as a positive electrode active material and a negative electrode active material, respectively. Specifically, such a lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate to which the positive electrode active material and the negative electrode active material are applied, respectively, are disposed with a separator interposed therebetween, and a packaging material for sealing and housing the electrode assembly together with an electrolyte, that is, a pouch exterior material. do.

In general, a lithium secondary battery may 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 according to the shape of the exterior material.

Recently, secondary batteries have been widely used not only in small devices such as portable electronic devices, but also in medium and large devices such as automobiles and power storage devices. When used in such a medium-large device, a large number of secondary batteries are electrically connected to increase capacity and output. In particular, a pouch-type secondary battery is often used in such a medium or large-sized device due to the advantage of easy stacking.

Meanwhile, in the related art, when a battery pack is configured by electrically connecting a plurality of secondary batteries, it is common to first configure a cell assembly including a plurality of secondary batteries, and then mount the cell assembly in a pack housing to manufacture the battery pack. is known as

However, in the case of a battery pack used in a vehicle, since external vibration or shock may be frequently transmitted to the battery pack mounted in the vehicle while the vehicle is running, the cell assembly may flow inside the pack housing, and these continuous cells The movement of the assembly may cause a problem in that the components of the battery pack are damaged, such as an electrical connection between the electrode terminal of the cell assembly and the external input/output terminal of the battery pack is disconnected.

Accordingly, in the prior art battery pack, a fastening structure capable of preventing the cell assembly mounted in the pack housing from moving is provided. In this fastening structure, a method of restricting movement of the cell assembly in the pack housing is used in a form in which a plurality of bolts penetrate both the pack housing and the cell assembly to apply a fixing force.

However, in the fastening structure using such bolts, the material cost increases due to the addition of the bolt member, and the manufacturing cost of the battery pack such as the time required for the assembly process such as inserting and fastening the bolt to fix the cell assembly in the pack housing There was an increasing problem with this.

Accordingly, the present invention has been devised to solve the above problems, and it is an object of the present invention to provide a battery pack and a vehicle having a pressurization structure capable of preventing the flow of a cell assembly mounted in a pack housing while reducing manufacturing cost. do it with

Other objects and advantages of the present invention may be understood by the following description, and will become more clearly understood by the examples of the present invention. Moreover, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the 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 receiving space for accommodating the cell assembly therein, an upper case formed to cover an upper portion of the cell assembly, and a lower case coupled to the upper case and formed to cover a lower portion of the cell assembly. It may include a pack housing.

Here, on the inner surface of the receiving space of the pack housing, the outer surface of the cell assembly is pressed so that the coupled and fastened force between the upper case and the lower case is transmitted to the cell assembly, and a protruding height according to the size of the cell assembly is provided. A deformable pressing structure may be provided.

In addition, the thickness of the cell assembly may be formed to be thicker than the size of the storage space of the pack housing.

Furthermore, the pressing structure may include a support portion protruding from the inner surface of the pack housing and formed to support the outer surface of the mounted cell assembly; and a pressing protrusion formed to protrude from the outer surface of the support part in a direction in which the cell assembly is located so as to press and fix the outer surface of the cell assembly in an inward direction.

In addition, the pressure protrusion may be deformed by compression at a distal end in contact with the outer surface of the cell assembly.

In addition, the thickness of the distal end of the pressing protrusion may be deformed by compression to be greater than the thickness of the inner end connected to the support portion.

Furthermore, the pack housing may be positioned so that the pressing protrusion formed on the inner upper surface of the upper case faces each other with the cell assembly interposed therebetween by another pressing protrusion formed on the inner lower surface of the lower case.

In addition, the support part may be configured to protrude inwardly from the inner surface of the pack housing and to extend linearly along the inner surface of the pack housing.

In addition, the pressing protrusion may be formed on a portion of the support portion facing the cell assembly.

Moreover, the support part may be formed in a form in which a plurality of them cross each other. Furthermore, the support part may be formed to extend from one inner side of the pack housing to the other inner side opposite the inner upper surface or inner lower surface.

In addition, a groove portion into which at least a portion of the pressing projection is inserted may be formed on an outer surface of the cell assembly facing the pressing projection.

In addition, the upper case and the lower case, each portion in contact with each other may be formed in a fastening structure welded to bind to each other.

In addition, the upper case and the lower case may be provided with a hinge portion to connect each part to each other and to open and close the upper case and the lower case.

In addition, a fixing protrusion protruding to press the inner surface of the receiving space of the pack housing in an outward direction may be formed on the outer surface of the cell assembly.

In addition, the vehicle according to the present invention for achieving the above object includes the battery pack according to the present invention.

According to one aspect of the present invention, in the battery pack, by forming a pressing structure inside the pack housing that presses the outer surface of the cell assembly so that the coupled and fastened force between the upper case and the lower case is transmitted to the cell assembly, an external shock However, it is possible to prevent the cell assembly accommodated in the pack housing from flowing due to vibration.

Accordingly, according to the present invention, even if an external shock or vibration is applied to the battery pack without adding a separate fixing member, it is possible to prevent the cell assembly or the pack housing provided in the battery pack from being damaged.

In particular, in the case of a battery pack for a vehicle, it may be frequently exposed to vibration and shock due to the nature of its use environment. can be applied.

In addition, according to one aspect of the present invention, by configuring such a pressing structure so that the protruding height is deformed according to a change in size within the tolerance range of the cell assembly, even when the dimensional tolerance of structures such as the pack housing or the cell assembly occurs, the battery It is possible to prevent the occurrence of assembly defects of the pack.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so that the present invention is described in such drawings should not be construed as being limited only to
1 is a perspective view schematically illustrating a battery pack according to an embodiment of the present invention.
FIG. 2 is a perspective view illustrating a cell assembly that is a part of the battery pack of FIG. 1 .
3 is a perspective view illustrating stacked secondary batteries that are part of the battery pack of FIG. 1 .
4 is a perspective view illustrating an upper case that is a part of the battery pack of FIG. 1 .
5 is a perspective view illustrating a lower case that is a part of the battery pack of FIG. 1 .
6 is a cross-sectional view illustrating one form of a cross-section taken along line AA′ of the battery pack of FIG. 1 .
7 is an enlarged perspective view illustrating an enlarged portion B of a lower case, which is a part of the battery pack of FIG. 5 .
8 is a plan view illustrating an upper case that is a part of the battery pack of FIG. 1 as viewed from the bottom.
9 is a plan view illustrating a lower case, which is a part of the battery pack of FIG. 1, as viewed from the top.
Fig. 10 is an enlarged cross-sectional view showing one form of a cross section of a portion C of the lower case of Fig. 6 .
11 is a perspective view schematically illustrating a cell assembly that is a part of a battery pack according to another embodiment of the present invention.
12 is a perspective view schematically illustrating a cell assembly that is a part of a battery pack 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, the terms or words used in the present specification and claims should not be construed as being limited to their ordinary or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in the present specification is only the most preferred embodiment of the present invention and does not represent all of the technical idea of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.

1 is a perspective view schematically illustrating a battery pack according to an embodiment of the present invention. FIG. 2 is a perspective view illustrating a cell assembly that is a part of the battery pack of FIG. 1 . And, FIG. 3 is a perspective view showing stacked secondary batteries that are part of the battery pack of FIG. 1 .

1 to 3 , the battery pack 400 according to the present invention may include a pack housing 300 and a cell assembly 200 accommodated in the pack housing 300 .

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

In this case, 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 packaging material.

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

In addition, the pouch case may be configured in a form including an outer insulating layer, a metal layer, and an inner adhesive layer. This pouch case protects internal components such as the electrode assembly and the electrolyte, and may include a metal thin film, such as an aluminum thin film, in order to compensate for the electrochemical properties of the electrode assembly and the electrolyte and to improve heat dissipation. have. In addition, the aluminum thin film is disposed between the insulating layer formed of an insulating material in order to secure electrical insulation with other components outside the secondary battery 100 or components inside the secondary battery 100 such as the electrode assembly and the electrolyte. may be interposed.

In particular, the pouch case may be composed of two pouches, and at least one of them may have a concave inner space formed therein. And, the electrode assembly may be accommodated in the inner space of the pouch. In addition, sealing parts are provided on the outer peripheral surfaces of the two pouches, so that the sealing parts are fused to each other, so that the inner space in which the electrode assembly is accommodated can be sealed.

Each pouch-type secondary battery 100 may include electrode leads 111 and 112 , and the electrode leads 111 and 112 may include a positive electrode lead 111 and a negative electrode lead 112 . Here, each of the electrode leads 111 and 112 is configured in the form of a plate, and when viewed in the F direction, may be arranged in a form to be laid down substantially parallel to the ground, and two wide surfaces are located at the upper and lower sides, respectively .

Meanwhile, terms indicating directions such as before, after, left, right, up, and down described in the present specification may vary depending on the position of the observer or the placed shape of the object. However, in the present specification, for convenience of description, directions such as front, rear, left, right, top, and bottom are separately indicated with reference to the time of viewing in the F direction.

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 case. In addition, these electrode leads 111 and 112 may function as electrode terminals of the secondary battery 100 .

For example, as shown in FIG. 3 , one electrode lead 111 may be configured to protrude from one side of one side of the sealing part of the secondary battery 100 , and the other electrode lead 112 may be It may be configured to be spaced apart from the electrode lead 111 and to protrude from the other side of one side of the sealing part.

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

4 is a perspective view illustrating an upper case that is a part of the battery pack of FIG. 1 . 5 is a perspective view illustrating a lower case that is a part of the battery pack of FIG. 1 .

1 to 5 , the pack housing 300 includes an upper case 310 and a lower case 320 .

Here, the upper case 310 may have an internal structure to cover the upper portion of the cell assembly 200 . That is, the inner structure of the upper case 310 may have a structure corresponding to the upper outer surface of the cell assembly 200 . Specifically, the upper case 310 may be formed with a side wall 312 that protrudes downwardly from the inner upper surface.

For example, as shown in FIG. 2 , the upper outer shape of the cell assembly 200 includes one upper wall 311 and four sidewalls 312 extending vertically downward from the upper wall 311 . In this case, the internal structure of the upper case 310 may include one inner upper surface and four inner side surfaces extending perpendicularly to the upper surface.

Also, the lower case 320 may have an internal structure to cover the lower portion of the cell assembly 200 . That is, the inner structure of the lower case 320 may have a structure corresponding to the lower outer surface of the cell assembly 200 . Specifically, a sidewall 323 protruding upwardly from the inner lower surface of the lower case 320 may be formed.

For example, as shown in FIG. 2 , the lower outer shape of the cell assembly 200 is formed by one lower wall 321 and four side walls 323 extending vertically upwardly from the lower wall 321 . In this case, the internal structure of the upper case 310 may include one inner lower surface and four inner side surfaces extending perpendicularly to the lower surface.

According to this configuration of the present application, by configuring the pack housing in such a way that the upper case and the lower case separated from each other are combined, the cell assembly is mounted inside the lower case, and then the upper case is combined and sealed on the upper part of the lower case. Therefore, there is an advantage that the cell assembly can be easily mounted inside the pack housing.

Moreover, the pack housing 300 serves to protect the components housed therein, such as the cell assembly 200, from external impacts or external substances. To this end, the pack housing 300 may be made of a metal material such as steel, or may be made of a low-conductivity plastic material.

6 is a cross-sectional view illustrating one form of a cross-section taken along line A-A' of the battery pack of FIG. 1 .

Referring to FIG. 6 together with FIGS. 4 and 5 , the pack housing 300 is provided with an accommodation space for accommodating the cell assembly 200 therein. That is, the pack housing 300 may have an inner space to cover at least a portion of the outer surface of the cell assembly 200 .

In addition, the upper case 310 and the lower case 320 may include a fastening structure 340 that can be coupled and fastened to each other.

Specifically, the sidewalls 312 and 323 of each of the upper case 310 and the lower case 320 may have edges 313 and 324 having similar sizes. In addition, each of the edges 313 and 324 of the upper case 310 and the lower case 320 may include a fastening structure 340 capable of being coupled to each other.

More specifically, in the lower end of the sidewall 312 of the upper case 310 , a groove portion 314 may be formed so that a portion of the upper end of the sidewall 323 of the lower case 320 is inserted. That is, in the upper case 310 and the lower case 320 , the upper end of the sidewall 323 of the lower case 320 is inserted into the groove 314 of the sidewall 312 of the upper case 310 . can be combined with each other.

Furthermore, the upper case 310 and the lower case 320 may have a welding-bonded fastening structure such that a portion of each portion in contact with each other binds to each other.

Specifically, a portion of the upper case 310 and the lower case 320 in contact with each other may be edges 313 and 324 formed on respective sidewalls. Moreover, the edges 313 and 324 of each of the upper case 310 and the lower case 320 may be welded to each other.

For example, as shown in FIG. 6 , in a state in which the groove portion 314 of the sidewall 312 of the upper case 310 and the upper end of the sidewall 323 of the lower case 320 are inserted, the upper In a state in which the case 310 is pressed in the downward direction with a force of 200 kgf or more, the inserted upper end of the sidewall 323 of the lower case 320 and the contact surface of the groove 314 may be welded to each other.

In this case, welding may be performed by various welding methods such as laser welding or resistance welding, and the present invention is not limited by these welding methods.

7 is an enlarged perspective view showing an enlarged portion B of the lower case, which is a part of the cell assembly of FIG. 5 . 8 is a plan view illustrating an upper case that is a part of the cell assembly of FIG. 1 as viewed from the bottom. And, FIG. 9 is a plan view showing the lower case, which is a part of the cell assembly of FIG. 1, as viewed from the top.

5 to 9 , a pressing structure 330 for pressing the outer surface of the cell assembly 200 may be provided on the inner surface of the receiving space of the pack housing 300 .

Specifically, the pressing structure 330 may be formed on the inner surface of the storage space formed by the internal structure of the upper case 310 and the lower case 320 so as to press the outer surface of the cell assembly 200 .

Accordingly, the pressing structure 330 may transmit a force generated while the upper case 310 and the lower case 320 are coupled to each other to press and fix the cell assembly 200 . In addition, the force transmitted to the cell assembly 200 by the pressing structure 330 may pressurize the secondary battery 100 accommodated in the cell assembly 200 so that it does not flow.

According to this configuration of the present invention, it is possible to prevent the cell assembly 200 accommodated in the pack housing 300 from flowing due to external shock or vibration. In addition, since the force applied to the cell assembly 200 is also transmitted to the stacked structure of the plurality of secondary batteries 100 , it is possible to effectively prevent the arrangement of the stacked structure from being disturbed by the pressing force.

Therefore, even in an environment where external shocks or vibrations are frequently applied, such as the battery pack 400 mounted in a vehicle, the cell assembly 200 built in the battery pack 400 is prevented from flowing inside the pack housing 300 . Thus, it is possible to prevent the internal components from being damaged due to friction between the pack housing 300 and the cell assembly 200 .

Also, the pressure structure 330 may have a protruding height depending on the size of the cell assembly 200 . That is, a portion of the pressing structure 330 in contact with the outer surface of the cell assembly 200 may be deformed by compression by the force pressing the cell assembly 200 .

Referring back to FIG. 6 , the thickness T1 of the cell assembly 200 may be thicker than the size of the storage space of the pack housing 300 . For example, the outer thickness of the cell assembly 200 may be thicker than the size of the storage space when the cell assembly 200 of the pack housing 300 is not accommodated within a dimensional tolerance range. In this case, the protruding height of the pressing structure 330 may be compressed and deformed by the force pressing the cell assembly 200, and thus may be further reduced.

According to this configuration of the present invention, the cell assembly has a so-called dimensional tolerance that is slightly different in the size of the appearance during the production process, but the pressing structure 330 in which the height is deformed according to the size change within the tolerance range of the cell assembly 200 . ) can be used to prevent assembly defects and product defects of the battery pack according to these dimensional tolerances.

Moreover, the volume of the secondary battery 100 located inside the cell assembly 200 may expand or decrease according to charging and discharging. Accordingly, the size of the external appearance of the cell assembly 200 may also be increased during charging and discharging. Since it can be changed, the pressing structure 330 can absorb the stress generation according to the size change of the cell assembly 200, thereby preventing deformation or damage of internal components of the battery pack, and increasing durability. .

In addition, the pack housing 300 may reduce the volume of gas generated during charging and discharging by surface-pressurizing the secondary battery 100 , thereby preventing a decrease in battery capacity, and improving battery life characteristics.

More specifically, the pressing structure 330 may include a support 331 formed to support the outer surface of the mounted cell assembly 200 .

For example, as shown in FIG. 7 , the support part 331 may be formed to protrude from the inner surface of the pack housing 300 . In addition, the support part 331 may include a support surface 332 that may be in contact with the outer surface of the cell assembly 200 .

Also, for example, as shown in FIG. 8 , a support part 331 protruding downward may be formed on the upper surface of the upper case 310 . Also, as shown in FIG. 9 , a support part 331 protruding upwardly may be formed on a lower surface of the lower case 320 .

According to this configuration of the present invention, the support part 331 supports the outer surface of the cell assembly 200 mounted in the receiving space of the pack housing 300 , thereby maintaining the cell assembly 200 stably accommodated. can

Referring back to FIGS. 5, 8 and 9 , the support part 331 protrudes inward from the inner surface of the pack housing 300 and linearly extends along the inner surface of the pack housing 300 . have.

Specifically, the support portion 331 may be formed to extend from one inner side of the upper case 300 to the other inner side of the upper case 300 through the inner upper surface.

In addition, the support part 331 may be formed to extend from one inner side of the lower case 300 to the other inner side of the lower case 300 through the inner lower surface. In this case, the pressing protrusion 333 may be formed on a part of the support part 331 facing the cell assembly 200 .

Furthermore, the linearly extended support part 331 may be formed in a shape that a plurality of them cross each other. Specifically, a plurality of the linearly extended support parts 331 may be a honeycomb pattern or a lattice pattern. For example, as shown in FIGS. 8 and 9 , the plurality of support parts 331 may be formed to cross each other in a grid pattern.

According to this configuration of the present invention, since a plurality of linear support parts 331 are formed on the inner surface of the pack housing 300 , the rigidity of the pack housing 300 can be improved uniformly as a whole. Accordingly, it is possible to prevent or reduce damage to the pack housing 300, such as an impact applied from the outside or the inside.

In addition, the pressing structure 330 may include a pressing protrusion 333 for pressing the outer surface of the cell assembly 200 .

Specifically, the pressing protrusion 333 may be formed to protrude from the outer surface of the support part 331 in the direction in which the cell assembly 200 is located so as to press and fix the outer surface of the cell assembly 200 in the inward direction. Moreover, the pressing protrusion 333 may be formed on a portion of the support portion 331 facing the cell assembly 200 .

For example, as shown in FIG. 8 , the pressing protrusion 333 formed on the upper surface of the upper case 310 may protrude downward in which the cell assembly 200 is located. Also, as shown in FIG. 9 , the pressing protrusion 333 formed on the lower surface of the lower case 320 may protrude upward in the cell assembly 200 .

According to this configuration of the present invention, the pressing protrusion 333 formed on the inner surface of the pack housing 300 presses the upper outer surface and the lower outer surface of the cell assembly 200, so that the cell mounted inside the pack housing 300 . It is possible to effectively prevent the assembly 200 from flowing.

Fig. 10 is an enlarged cross-sectional view showing one form of a cross section of a portion C of the lower case of Fig. 6 .

Referring to FIG. 10 , the pressing protrusion 333 may have a compression-deformed end portion in contact with the outer surface of the cell assembly 200 .

Specifically, since the pressing protrusion 333 is in a state in which the outer surface of the cell assembly 200 is pressed, the distal end portion in contact with the outer surface of the cell assembly 200 may be compressed and deformed in a direction opposite to the pressing direction. Accordingly, the protruding height S of the pressing protrusion 333 may be reduced according to the degree of compression deformation.

Furthermore, the pressing protrusion 333 may be divided into a distal end contacting the cell assembly 200 in a protruding direction and an inner end connected to the support 331 . In this case, the thickness T2 of the distal end of the pressing protrusion 333 may be compressed to be greater than the thickness T1 of the inner end while the outer surface of the cell assembly 200 is pressed.

That is, the thickness of the distal end and the thickness of the inner end may be the same or smaller than the thickness of the inner end in the state before the pressure protrusion 333 presses the cell assembly 200, but as shown in FIG. 10 , the pressure protrusion 333 is , in a state in which the outer surface of the cell assembly 200 is pressed, the thickness T2 of the distal end may be compressed and deformed to be greater than the thickness T3 of the inner end.

Referring back to FIGS. 8 and 9 , the pack housing 300 may be positioned such that one pressing protrusion 333 and the other pressing protrusion 333 face each other in the receiving space.

Specifically, the pressing protrusion 333 formed in the D portion of the inner upper surface of the upper case 310 includes the other pressing protrusion 333 formed in the E portion of the inner lower surface of the lower case 320 and the cell assembly ( 200) and may be positioned to face each other.

For example, as shown in FIGS. 8 and 9 , the eight pressing protrusions 333 formed on the inner upper surface of the upper housing of FIG. 8 are eight pressing projections 333 formed on the inner lower surface of the lower housing of FIG. ) and the cell assembly 200 may be positioned to face each other.

According to this configuration of the present application, the pressing protrusion 333 presses the corresponding both outer surfaces of the cell assembly 200, so that the pressing force in the downward direction and the pressing force in the upward direction correspond to each other, a stronger fixing force can exert

Again, referring to FIG. 3 together with FIG. 2 , the cell assembly 200 may include a cartridge assembly 210 configured to surround the side surfaces of the stacked secondary batteries 100 .

Specifically, the cartridge assembly 210 may have a structure in which at least two or more cartridges 211 and 212 are fastened to each other. Here, the cartridge 211 may be a member for enclosing the outer surface of at least one or more secondary batteries 100 .

In addition, since the cartridge assembly 210 can serve to protect the appearance of the stacked secondary batteries 100 , the secondary battery 100 is stably accommodated in the battery pack 400 , and impacts or materials, etc. It serves to protect the secondary battery 100 from other external physical elements.

In addition, the cartridge assembly 210 may include a material having elasticity capable of effectively dispersing stress caused by volume expansion due to swelling caused by charging and discharging of the secondary battery 100 . For example, the cartridge assembly 210 may be made of a plastic material.

Moreover, the cartridge 211 is configured to hold the secondary battery 100 to prevent its flow, and to allow a plurality of secondary batteries 100 to be stacked with each other, thereby guiding the stacking assembly of the secondary batteries 100 . . The cartridge 211 may be replaced by various other terms such as a frame for stacking, and may be configured in a square ring shape with a central portion empty. In this case, the four corners of the square ring shape may be respectively located on the outer periphery of the pouch-type secondary battery 100 .

Meanwhile, again referring to FIGS. 5, 8 and 9 , a protrusion 325 may be provided in the inner space in which the cell assembly 200 of the upper case 310 and the lower case 320 is accommodated. .

Specifically, the protrusion 325 of the upper case 310 may be formed to extend in a direction perpendicular to the ground, that is, in a direction perpendicular to the inner upper surface of the upper case 310 . In addition, at least one side of the protrusion 325 may be surface-bonded with a side surface of the inner space of the upper case 310 .

In addition, the protrusion 325 of the lower case 320 may be formed to extend in a direction perpendicular to the ground, that is, in a direction perpendicular to the inner lower surface of the lower case 320 . In addition, at least one side of the protrusion 325 may be surface-bonded with a side surface of the inner space of the lower case 320 .

Referring back to FIG. 2 , at least two slots 213 may be formed on the outer surface of the cell assembly 200 .

The slot 213 may include a structure in which the protrusion 325 is inserted and fastened in a sliding manner. Specifically, the slot 213 may have an internal structure having a size corresponding to the outer surface of the protrusion 325 so that the protrusion 325 formed inside the pack housing 300 can be inserted.

That is, the slot 213 may be engaged with the protrusion 325 formed on the inner surface of the pack housing 300 in a direction in which the cell assembly 200 is accommodated and inserted and fastened in a sliding manner.

According to this configuration of the present application, it is possible to exert sufficient fixing force to prevent flow in the pack housing 300 of the cell assembly 200 without the configuration of a separate fastening member. Accordingly, the manufacturing cost of the pack is reduced, and the cell assembly 200 can be easily mounted and fastened in the pack housing 300 without making an assembling error, thereby improving the manufacturing efficiency of the battery pack.

Referring back to FIG. 6 together with FIG. 2 , the cell assembly 200 may include an end plate 220 covering an upper surface and a lower surface of the cell assembly 200 . That is, the end plate 220 may be mounted at a position facing the upper surface of the secondary battery 100 positioned at the uppermost end of the stacked secondary cells 100 or the lower surface of the secondary battery 100 positioned at the lowermost end of the stacked secondary cells 100 .

Moreover, the end plate 220 may be configured in a plate shape having a large upper surface and a lower surface to cover the upper and lower surfaces of the cell assembly 200 , respectively. In addition, the end plate 220 may serve to provide mechanical rigidity to the cell assembly 200 and to protect the cell assembly 200 from external impact. To this end, the end plate 220 may be made of a metal material such as steel.

Referring back to FIGS. 4 and 5 , the battery pack according to another embodiment of the present invention may further include a hinge portion configured to connect a portion of each of the upper case 310 and the lower case 320 to each other. .

Here, the upper case 310 and the lower case 320 may be configured to open and close each other by rotationally moving based on the portion where the hinge portion is formed. For example, one side of the edge 313 formed along the sidewall 312 of the upper case 310 and one side of the edge 324 formed along the sidewall 323 of the lower case 320 are connected to each other A hinge portion may be formed.

According to this configuration of the present application, it is possible to easily open and close the upper case 310 and the lower case 320 by using the hinge structure. In addition, each one side of the upper case 310 and the lower case 320 is connected to each other through a hinge part, so that only the other side of the other upper case 310 and the lower case 320 is coupled to each other and the pack housing Since 300 can be sealed, manufacturing operations can be facilitated.

11 is a perspective view schematically illustrating a cell assembly that is a part of a battery pack according to another embodiment of the present invention.

Referring to FIG. 11 , in the battery pack according to another embodiment of the present invention, a groove 230 may be formed on an outer surface of the cell assembly 201 .

Specifically, at least a portion of the pressing protrusion 333 formed in the receiving space of the pack housing 300 may be inserted into the groove 230 . More specifically, the interior of the groove 230 may be filled with the distal end of the pressing protrusion 333 . Furthermore, the groove portion 230 may be positioned to face the pressing protrusion 333 formed inside the pack housing 300 .

For example, as shown in FIG. 11 , four grooves 230 may be formed in the upper outer surface of the cell assembly 201 . The distal end of the pressing protrusion 333 formed on the upper housing 310 may be inserted into the groove 230 .

According to this configuration of the present invention, the pressing protrusion 333 not only presses the outer surface of the cell assembly 201, but also the pressing protrusion 333 is inserted into the groove 230 formed on the outer surface of the cell assembly 200, It is possible to exert a certain constraint so that the cell assembly 200 does not flow in the front, rear, left, and right directions.

12 is a perspective view schematically illustrating a cell assembly that is a part of a battery pack according to another embodiment of the present invention.

Referring to FIG. 12 , in the battery pack according to another embodiment of the present invention, a fixing protrusion 240 may be formed on an outer surface of the cell assembly 202 .

Here, the fixing protrusion 240 may protrude to press the inner surface of the receiving space of the pack housing 300 in an outward direction.

In addition, the fixing protrusion 240 may be deformed by compression by a force pressing the inner surface of the pack housing 300 . Accordingly, the protruding height of the fixing protrusion 240 may be deformed according to the size of the storage space of the pack housing 300 .

Specifically, the fixing protrusion 240 may be in a form in which the distal end in contact with the inner surface of the pack housing 300 is compressed and deformed. That is, the fixing protrusion 240 is in a state in which the inner surface of the pack housing 300 is pressed, so that the distal end thereof may be compressed and deformed in a direction opposite to the pressing direction. Accordingly, the protruding height of the fixing protrusion 240 may be reduced according to the pressing force.

According to this configuration of the present invention, since the cell assembly 202 directly presses the inner surface of the pack housing 300 , the flow of the cell assembly 202 accommodated in the pack housing 300 can be prevented.

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

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

Meanwhile, in the present specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are for convenience of explanation only and may vary depending on the location of the object or the position of the observer It is apparent to those skilled in the art that the present invention may

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

400: battery pack
100: secondary battery
200: cell assembly
210: cartridge assembly
220: end plate
300: pack housing
310: upper case
320: lower case
330: pressure structure
331: support
333: pressure projection

Claims (13)

a cell assembly including a plurality of secondary batteries; and
A pack having a receiving space for accommodating the cell assembly therein, an upper case formed to cover an upper portion of the cell assembly, and a lower case coupled to the upper case and formed to cover a lower portion of the cell assembly comprising a housing;
The inner surface of the receiving space of the pack housing presses the outer surface of the cell assembly so that the coupled and fastened force between the upper case and the lower case is transmitted to the cell assembly, and the protruding height is deformed according to the size of the cell assembly A pressurizing structure is provided,
The pressure structure is
a support part protruding from the inner surface of the pack housing and configured to support the cell assembly accommodated in the receiving space of the pack housing; and
and a pressing protrusion protruding in a direction in which the cell assembly is located from an outer surface of a portion of the support portion to press and fix the outer surface of the cell assembly,
The pressing protrusion, the battery pack, characterized in that the distal end in contact with the outer surface of the cell assembly is compressed and deformed in a direction opposite to the pressing direction of the pressing protrusion. According to claim 1,
The battery pack, characterized in that the thickness of the cell assembly is formed to be thicker than the size of the storage space of the pack housing. delete delete According to claim 1,
A battery pack, characterized in that the thickness of the distal end of the pressing protrusion is compressed to be greater than the thickness of the inner end connected to the support portion. 6. The method of claim 5,
In the pack housing, the pressing protrusion formed on the inner upper surface of the upper case is positioned to face each other with another pressing protrusion formed on the inner lower surface of the lower case and the cell assembly therebetween. According to claim 1,
The support part is configured to protrude inward from the inner surface of the pack housing and linearly extend along the inner surface of the pack housing,
The pressing protrusion is formed on a part of the support part facing the cell assembly. 8. The method of claim 7,
A plurality of the support parts are formed to cross each other, and the battery pack is characterized in that it extends from one inner side of the pack housing through the inner upper surface or the inner lower surface to the other inner side of the opposite side. According to claim 1,
A battery pack, characterized in that a groove portion into which at least a portion of the pressing projection is inserted is formed on an outer surface of the cell assembly facing the pressing projection. According to claim 1,
The upper case and the lower case, the battery pack, characterized in that each portion in contact with each other is formed in a fastening structure welded to bind to each other. According to claim 1,
The upper case and the lower case are each provided with a hinge part to connect one part to each other and to open and close the upper case and the lower case. According to claim 1,
A battery pack, characterized in that a fixing protrusion protruding to press the inner surface of the receiving space of the pack housing in an outward direction is formed on the outer surface of the cell assembly. 13. A motor vehicle comprising a battery pack according to any one of claims 1, 2, and 5 to 12.

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