Battery pack

Abstract

To provide a battery pack comprising an easily attachable and detachable auxiliary partition wall and capable of suppressing a swelling phenomenon that may occur in a battery module accommodated inside.SOLUTION: A battery pack comprises a pack case including a module area where a cell stack is placed. The pack case includes: a base plate that supports a lower portion of the cell stack; a main partition wall formed to extend across the base plate and perpendicularly coupled to a central portion of the base plate; a side wall perpendicularly coupled along a perimeter of the base plate; and an auxiliary partition wall of which opposite ends are coupled to the main partition wall and the side wall, respectively, and which includes a pair of reinforcement plates coupled to each other. The pair of reinforcement plates includes a plurality of reinforcement ribs formed to protrude and extending in a longitudinal direction of the auxiliary partition wall.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a battery pack.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0059860, filed May 16, 2022, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0003] Types of secondary batteries include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel metal hydride batteries, and nickel zinc batteries. The operating voltage of such a unit secondary battery cell, i.e., a unit battery cell, is approximately 2.5V to 4.2V. Therefore, if a higher output voltage is required, a battery pack may be configured by connecting a plurality of battery cells in series. Alternatively, a battery pack may be configured by connecting a number of battery cells in parallel depending on the required charge / discharge capacity of the battery pack. Therefore, the number of battery cells included in the battery pack may be variously set depending on the required output voltage or charge / discharge capacity.

[0004] For example, when a battery pack is constructed by connecting a plurality of battery cells in series and / or parallel, a battery module made up of the plurality of battery cells is first constructed.

[0005] FIG. 1 shows a commonly used battery module 10 and a pack case 20 included in a battery pack that houses the battery module 10.

[0006] 1(a) shows one form of a battery module 10. As shown in the figure, a conventional battery module 10 has end plates 12 attached to the front and rear ends, and its sides are surrounded and protected by a module frame 11. In recent years, battery modules 10 in which the module frame 11 is eliminated and the internal cells are exposed have also been used.

[0007] 1(b) shows a pack case 20 in a typical battery pack that provides a space for accommodating battery modules 10. In the pack case 20 shown in FIG. 1(b), each battery module 10 is supported at its lower part by a base plate 21 in a space partitioned by side walls 22 and partition walls 23, and is electrically connected to other battery modules 10 in series or parallel.

[0008] Meanwhile, abnormal phenomena may occur in battery modules included in a battery pack during charging and discharging processes, one example of which is swelling. The swelling occurs when a battery cell expands due to gas generated inside the battery cell. The swelling may progress from one battery cell to another within the battery module, ultimately affecting the battery module. In particular, the swelling may progress throughout the center of the battery module, i.e., the entire module frame. However, because the module frame is not a fixed part in each battery module typically housed in a pack case, severe swelling may also affect adjacent battery modules.

[0009] Therefore, a new solution is needed that can minimize deformation of the battery modules even when swelling occurs in each battery module housed in the pack case. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Korean Patent Publication No. 10-2018-0113906 Summary of the Invention [Problem to be solved by the invention]

[0011] Therefore, the present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to provide a structure that can reinforce the side of a battery module housed in a pack case.

[0012] Another object of the present invention is to suppress the swelling phenomenon of a battery module housed in a pack case.

[0013] Other objects and advantages of the present invention can be understood from the following description and will become more apparent from the embodiments of the present invention. Also, it will be readily apparent that the objects and advantages of the present invention can be realized by the means and combinations thereof as claimed. [Means for solving the problem]

[0014] According to the present invention, there is provided a battery pack accommodating a battery module including a cell stack in which a plurality of cells are stacked, the battery pack including: a pack case including a module area in which the battery module is placed; the pack case including: a base plate supporting a lower portion of the battery module; a main partition wall extending across the base plate and vertically coupled to a center of the base plate; a side wall vertically coupled to a periphery of the base plate; and an auxiliary partition wall having both ends coupled to the main partition wall and the side wall, the auxiliary partition wall including a pair of reinforcing plates coupled to each other, the reinforcing plate including a plurality of protruding reinforcing ribs extending along a longitudinal direction of the reinforcing plate.

[0015] The reinforcing ribs may be formed at predetermined intervals along the longitudinal direction of the reinforcing plate.

[0016] The reinforcing plate may include a curved reinforcing groove between a pair of reinforcing ribs spaced apart along the length of the reinforcing plate.

[0017] The shape of the reinforcing groove may be the same as the shape of the reinforcing rib so that the reinforcing rib can be inserted into the groove.

[0018] The reinforcing ribs and reinforcing grooves may be formed alternately along the longitudinal direction of the auxiliary partition wall.

[0019] The reinforcing rib may have at least one of a trapezoidal shape and a parabolic shape.

[0020] The reinforcing ribs may be formed at predetermined intervals along a height direction of the reinforcing plate.

[0021] The auxiliary partition wall may include a first reinforcing plate having a reinforcing rib formed on one side thereof and a second reinforcing plate having a reinforcing rib formed on one side thereof opposite to the first reinforcing plate, and the reinforcing ribs included in the first and second reinforcing plates may be formed to have heights corresponding to each other.

[0022] The reinforcing plate includes a curved reinforcing groove between a pair of reinforcing ribs spaced apart along the longitudinal direction of the reinforcing plate, and the first reinforcing plate can be joined so that the reinforcing ribs and reinforcing grooves engage with the reinforcing grooves and reinforcing ribs of the second reinforcing plate.

[0023] The first reinforcing plate may be coupled to the second reinforcing plate so that each reinforcing rib is inserted into a reinforcing groove of the second reinforcing plate at a corresponding position, and the second reinforcing plate may be coupled to the first reinforcing plate so that each reinforcing rib is inserted into a reinforcing groove of the first reinforcing plate at a corresponding position.

[0024] The reinforcing plate may include a through-hole drilled so as to pass vertically through the reinforcing rib.

[0025] The pack case may include a coupling groove formed at the bottom of the module area corresponding to the position of the through hole, and the auxiliary partition wall may be coupled to the pack case by a bolt passing through the through hole and inserted into the coupling groove.

[0026] The reinforcing plate may further include a reinforcing bar extending vertically through the reinforcing rib, and the reinforcing bar may include a reinforcing hole drilled vertically through the reinforcing bar.

[0027] The pack case may include a coupling groove formed at a bottom of the module region corresponding to the position of the reinforcing hole, and the auxiliary partition wall may be coupled to the pack case by a bolt that passes through the reinforcing hole and is inserted into the coupling groove.

[0028] The reinforcing plate includes auxiliary connection holes drilled horizontally through both ends, and the side walls and main partition wall each include auxiliary connection grooves formed to correspond to the positions of the auxiliary connection holes of the auxiliary partition wall, and the auxiliary partition wall can be connected to the pack case by bolts that pass through the auxiliary connection holes and are inserted into the auxiliary connection grooves. [Effects of the Invention]

[0029] According to the present invention, the swelling phenomenon of a battery module housed in a pack case can be effectively suppressed.

[0030] Furthermore, the present invention can improve the assembly efficiency of the pack case by using a structure that can partition the battery modules housed in the pack case and can be freely detached from the pack case. [Brief explanation of the drawings]

[0031] [Figure 1] 1 shows a conventional battery module and pack case. [Figure 2] 1 is a perspective view of a pack case included in a battery pack according to a first embodiment of the present invention; [Figure 3] This shows the state in which the battery module is housed in the pack case of Figure 2. [Figure 4] 1 shows the pack case with the auxiliary partition removed. [Figure 5] 3 is a perspective view of an auxiliary partition included in the battery pack according to the first embodiment of the present invention. FIG. [Figure 6] 1 shows a pair of stiffener plates separated. [Figure 7] FIG. 7 is a plan view of a pair of reinforcing plates shown in FIG. 6. [Figure 8] 1 shows an auxiliary partition wall in which a first reinforcing plate and a second reinforcing plate are combined. [Figure 9] This shows that bolts have been inserted into the through holes and auxiliary connection holes. [Figure 10] 10 illustrates a pack case included in a battery pack according to a second embodiment of the present invention and a battery module accommodated in the pack case. [Figure 11] 10 shows a pair of reinforcing plates constituting an auxiliary partition wall included in a battery pack according to a second embodiment of the present invention. [Figure 12] 1 shows an auxiliary partition wall in which a first reinforcing plate and a second reinforcing plate are combined. [Figure 13] This shows that bolts have been inserted into the reinforcing holes and auxiliary connecting holes. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concepts of the terms to best describe his own invention.

[0033] Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and that there may be various equivalents and modifications that can replace them at the time of this application.

[0034] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0035] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and therefore the shapes and sizes of components in the drawings may be exaggerated, omitted, or illustrated schematically for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0036] The present invention relates to a battery pack that houses a battery module including a cell stack in which a plurality of cells are stacked.

[0037] The battery module accommodated in the battery pack of the present invention may be composed of a cell stack and end plates coupled to the front and rear of the cell stack, respectively, or may further include a module frame surrounding the side and top and bottom surfaces of the cell stack.

[0038] The battery pack of the present invention includes a pack case including a module area in which a battery module is placed.

[0039] 2 to 9 relate to a battery pack according to a first embodiment of the present invention, and FIGS. 10 to 13 relate to a battery pack according to a second embodiment of the present invention.

[0040] Each embodiment will be described below with reference to the drawings.

[0041] (First embodiment) FIG. 2 is a perspective view of a pack case 200 included in the battery pack according to the first embodiment of the present invention, and FIG. 3 shows a state in which a battery module 100 is accommodated in the pack case 200 of FIG. 2.

[0042] As shown in FIGS. 2 and 3, the pack case 200 is composed of a base plate 210, a main partition wall 220, a side wall 230, and an auxiliary partition wall 240.

[0043] The auxiliary partition 240 of the present invention is detachably installed on the base plate 210 and the side wall 230 of the pack case 200 .

[0044] FIG. 4 shows the pack case 200 with the auxiliary partition wall 240 removed.

[0045] 2 to 4, the base plate 210 corresponds to the bottom of the pack case 200 and serves to support the lower portion of the battery module 100 mounted on the upper portion.

[0046] The base plate 210 may have a coupling groove 210h formed therein so that a bolt B can be inserted therein to enable screw coupling.

[0047] The main partition wall 220 extends across the base plate 210 and is coupled to the center of the base plate 210 vertically.

[0048] The battery modules 100 mounted on both sides of the main partition wall 220 are symmetrical with respect to the main partition wall 220 .

[0049] The main partition 220 serves to divide the internal space of the pack case 200 into two large areas, and also serves to insert and protect various conductive wires used inside the pack case 200.

[0050] The side wall 230 is vertically coupled to the periphery of the base plate 210 and serves to surround and protect the outer surface of the battery module 100 positioned on the base plate 210 .

[0051] The main bulkhead 220 and the sidewall 230 may have auxiliary coupling grooves 220h and 230h formed therein so that a bolt B can be inserted therein to enable screw coupling.

[0052] FIG. 5 is a perspective view of the auxiliary partition 240 included in the battery pack according to the first embodiment of the present invention.

[0053] As shown in FIG. 2, both ends of the auxiliary partition 240 are connected to the main partition 220 and the side wall 230, respectively.

[0054] The auxiliary barrier ribs 240 are installed on both sides of the main barrier ribs 220 at a predetermined interval along the longitudinal direction d of the main barrier ribs 220, and each auxiliary barrier rib 240 is adjacent to two module regions A on both sides.

[0055] The distance between the auxiliary barrier ribs 240 is preferably approximately the same as the width of the battery modules 100 to be used. That is, the battery modules 100 accommodated in the module area A are preferably inserted such that both sides thereof are in close contact with the auxiliary barrier ribs 240. Therefore, the battery modules 100 inserted into the module area A can be supported by the auxiliary barrier ribs 240 on both sides.

[0056] As shown in FIG. 5, the auxiliary partition wall 240 is composed of a pair of reinforcing plates 241 joined together, and the pair of reinforcing plates 241 are shaped to have an interlocking structure on one side facing each other.

[0057] Specifically, the reinforcing plate 241 is characterized by including a plurality of reinforcing ribs 2411 protruding from one side and extending along the longitudinal direction d of the reinforcing plate 241, and each reinforcing rib 2411 engages with the reinforcing rib 2411 of the opposing reinforcing plate 241, thereby combining the pair of reinforcing plates 241 to form the auxiliary partition wall 240.

[0058] FIG. 6 shows a pair of reinforcing plates 241 separated.

[0059] The reinforcing rib 2411 may preferably have a trapezoidal shape with inclined surfaces formed on both sides, or may have a parabolic shape (not shown).

[0060] Referring to FIG. 6, the reinforcing ribs 2411 are formed at predetermined intervals along the longitudinal direction d of the reinforcing plate 241.

[0061] The reinforcing plate 241 includes reinforcing grooves 2412 formed in a curved shape by the inclined surfaces of the reinforcing ribs 2411 between adjacent reinforcing ribs 2411 arranged along the longitudinal direction d. In this case, it is preferable that the reinforcing grooves 2412 have the same shape as the reinforcing ribs 2411 so that the reinforcing ribs 2411 can be inserted into and engaged with each other. For example, if the reinforcing ribs 2411 are trapezoidal, the reinforcing grooves 2412 also have a trapezoidal shape.

[0062] The reinforcing ribs 2411 and the reinforcing grooves 2412 are preferably formed alternately along the longitudinal direction d of the reinforcing plate 241 .

[0063] 6, the reinforcing ribs 2411 are formed at predetermined intervals along the height direction d2 of the reinforcing plate 241. As shown in FIG.

[0064] FIG. 7 is a plan view of the pair of reinforcing plates 241 shown in FIG.

[0065] As shown in FIG. 7, the auxiliary partition wall 240 of the present invention includes a first reinforcing plate 241a located on one side and a second reinforcing plate 241b located opposite the first reinforcing plate 241a.

[0066] The reinforcing ribs 2411 formed on the first reinforcing plate 241a and the second reinforcing plate 241b are formed at heights symmetrical to each other with respect to the height direction d2 of the reinforcing plate 241, but are formed at positions offset from each other with respect to the longitudinal direction d of the reinforcing plate 241. For example, the reinforcing rib 241a1 of the first reinforcing plate 241a and the reinforcing groove 2412 of the second reinforcing plate 241b are positioned opposite each other. Therefore, in the auxiliary partition wall 240 of the present invention formed by combining the first reinforcing plate 241a and the second reinforcing plate 241b, the reinforcing rib 241a1 and the reinforcing groove 2412 of the first reinforcing plate 241a are engaged with the reinforcing groove 2412 and the reinforcing rib 241b1 of the second reinforcing plate 241b.

[0067] Figure 8 shows an auxiliary partition 240 in which a first reinforcing plate 241a and a second reinforcing plate 241b are combined. As shown in Figure 8, the first reinforcing plate 241a is combined with the second reinforcing plate 241b so that each reinforcing rib 241a1 is inserted into the reinforcing groove 2412 of the second reinforcing plate 241b at a corresponding position, and the second reinforcing plate 241b is combined with the first reinforcing plate 241a so that each reinforcing rib 241b1 is inserted into the reinforcing groove 2412 of the first reinforcing plate 241a at a corresponding position.

[0068] In this case, the reinforcing ribs 2411 that are joined together but offset from each other form a strip extending along the longitudinal direction d of the reinforcing plate 241. That is, the reinforcing ribs 2411 that are interlocked with each other in symmetrical shapes contact each other so that their inclined surfaces coincide with each other to form a single strip. Therefore, one auxiliary partition 240 may have multiple strips formed by joining the reinforcing ribs 2411 along the height direction d2 of the reinforcing plate 241.

[0069] With the above-described structure, each battery module 100 accommodated in the battery pack of the present invention as shown in FIG. 3 can be firmly supported at its side by each of the strip-shaped reinforcing ribs 2411.

[0070] The reinforcing plate 241 included in the battery pack according to the first embodiment of the present invention includes through-holes 2411h that are bored to vertically penetrate the reinforcing ribs 2411, as shown in FIGS.

[0071] The through holes 2411h are formed at the same position in each reinforcing rib 2411. For example, the through holes 2411h included in each reinforcing rib 2411 formed along the height direction d2 of the reinforcing plate 241 at the same position based on the longitudinal direction d of the reinforcing plate 241 are formed at positions corresponding to each other.

[0072] A bolt B may be inserted into each through hole 2411h formed at the same position based on the longitudinal direction d of the reinforcing plate 241, and the reinforcing plate 241 may be screwed to the bolt B inserted into the through hole 2411h.

[0073] The battery module 100 accommodated in the module area A of the battery pack of the present invention may be primarily supported on its sides by the reinforcing plate 241 included in the auxiliary partition 240, and may be triple-supported on its sides by the reinforcing rib 2411 formed on the reinforcing plate 241 and the bolt B inserted into the through hole 2411h of the reinforcing rib 2411.

[0074] As shown in FIGS. 6 and 8, the reinforcing plate 241 includes protrusions 243 protruding upward from both ends thereof, and auxiliary coupling holes 243h drilled to penetrate the protrusions 243 in the horizontal direction.

[0075] A bolt B may be inserted into the auxiliary coupling hole 243h, and the reinforcing plate 241 may be screw-coupled to the bolt B inserted into the auxiliary coupling hole 243h.

[0076] 9 shows that a bolt B is inserted into each of the through-hole 2411h and the auxiliary coupling hole 243h of one of the reinforcing plates 241. (However, for convenience, the specific structure of the bolt B, such as the threads, is omitted from the illustration.)

[0077] Referring to FIG. 9, one bolt B is inserted into and coupled to the through-hole 2411h of each reinforcing rib 2411 formed at the same position in the longitudinal direction d of the reinforcing plate 241.

[0078] Further, a bolt B is inserted horizontally into an auxiliary coupling hole 243h formed at the end of the reinforcing plate 241 and coupled thereto.

[0079] The battery module 100 of the present invention can be fixed to the pack case 200 included in the battery pack by the bolts B inserted into and coupled to the through-holes 2411h and the auxiliary coupling holes 243h.

[0080] Specifically, the auxiliary partition 240 may be fixedly coupled to the base plate 210 by a bolt B that passes vertically through the through-hole 2411h and is inserted into the coupling groove 210h of the base plate 210. The bolt B may be inserted into and coupled to each of the plurality of through-holes 2411h that are spaced apart at predetermined intervals along the longitudinal direction d of the reinforcing plate 241.

[0081] The bolts B inserted into the through holes 2411h fix a pair of reinforcing plates 241 constituting the auxiliary partition wall 240 to the base plate 210. Therefore, even if gas is generated inside the battery module 100 accommodated in the module region A between the auxiliary partition walls 240, the swelling phenomenon in which the battery module 100 expands can be suppressed by the bolts B arranged vertically along the side of the battery module 100 and the auxiliary partition wall 240 connected to the base plate 210 by the bolts B.

[0082] The auxiliary partition 240 may be installed such that the auxiliary coupling holes 243h of each reinforcing plate 241 correspond to the auxiliary coupling grooves 220h, 230h of the side wall 230 and the main partition 220. In this case, the auxiliary partition 240 may be fixedly coupled to the side wall 230 and the main partition 220 by bolts B that horizontally pass through the auxiliary coupling holes 243h and are inserted into the auxiliary coupling grooves 220h, 230h. Therefore, the auxiliary partition 240 installed inside the pack case 200 may be fixedly coupled to not only the base plate 210 but also the side wall 230 and the main partition 220 to support the battery module 100.

[0083] The battery pack of the present invention may further include an upper cover (not shown) coupled to the pack case 200 to cover the upper portion of each battery module 100 accommodated in the module area A of the pack case 200.

[0084] The upper cover is a well-known technology, and therefore a detailed description thereof will be omitted.

[0085] (Second embodiment) FIG. 10 shows a pack case 200 included in a battery pack according to a second embodiment of the present invention and a battery module 100 housed in the pack case 200. As shown in FIG.

[0086] The battery pack according to the second embodiment of the present invention differs from the battery pack according to the first embodiment in the structure of the auxiliary partition 240. Therefore, the configurations of the base plate 210, the main partition 220, and the side wall 230 are replaced with those of the first embodiment.

[0087] FIG. 11 shows a pair of reinforcing plates 241 constituting an auxiliary partition wall 240 included in a battery pack according to a second embodiment of the present invention.

[0088] The auxiliary partition wall 240 has a structure in which the pair of reinforcing plates 241 are combined together.

[0089] The auxiliary partition 240 has both ends coupled to the main partition 220 and the side wall 230, respectively, similar to the auxiliary partition 240 of the battery pack according to the first embodiment.

[0090] As shown in FIG. 11, the auxiliary partition wall 240 is composed of a pair of reinforcing plates 241, and the pair of reinforcing plates 241 are shaped to have an interlocking structure on one side facing each other.

[0091] Specifically, the reinforcing plate 241 is characterized by including a plurality of reinforcing ribs 2411 protruding from one side and extending along the longitudinal direction d of the reinforcing plate 241, and each reinforcing rib 2411 engages with the reinforcing rib 2411 of the opposing reinforcing plate 241, thereby combining the pair of reinforcing plates 241 to form the auxiliary partition wall 240.

[0092] The reinforcing rib 2411 may preferably have a trapezoidal shape with inclined surfaces formed on both sides, or may have a parabolic shape (not shown).

[0093] Referring to FIG. 11, the reinforcing ribs 2411 are formed at predetermined intervals along the longitudinal direction d of the reinforcing plate 241.

[0094] The reinforcing plate 241 includes reinforcing grooves 2412 formed in a curved shape by the inclined surfaces of the reinforcing ribs 2411 between adjacent reinforcing ribs 2411 arranged along the longitudinal direction d. In this case, it is preferable that the reinforcing grooves 2412 have the same shape as the reinforcing ribs 2411 so that the reinforcing ribs 2411 can be inserted into and engaged with each other. For example, if the reinforcing ribs 2411 are trapezoidal, the reinforcing grooves 2412 also have a trapezoidal shape.

[0095] The reinforcing ribs 2411 and the reinforcing grooves 2412 are preferably formed alternately along the longitudinal direction d of the reinforcing plate 241 .

[0096] 11, the reinforcing ribs 2411 are formed at predetermined intervals along the height direction d2 of the reinforcing plate 241. As shown in FIG.

[0097] The reinforcing plate 241 constituting the auxiliary partition wall 240 includes a first reinforcing plate 241a located on one side and a second reinforcing plate 241b facing the first reinforcing plate 241a and coupled to the first reinforcing plate 241a.

[0098] The reinforcing ribs 2411 formed on the first reinforcing plate 241a and the second reinforcing plate 241b are formed at heights that are symmetrical with respect to each other with respect to the height direction d2 of the reinforcing plate 241, but are formed at positions that are offset from each other with respect to the longitudinal direction d of the reinforcing plate 241. For example, the reinforcing rib 241a1 of the first reinforcing plate 241a and the reinforcing groove 2412 of the second reinforcing plate 241b are positioned symmetrical with each other.

[0099] The auxiliary partition 240 included in the battery pack according to the second embodiment of the present invention is characterized in that it further includes a reinforcing bar 242 extending vertically through the reinforcing rib 2411, as shown in FIG. 11.

[0100] The reinforcing bars 242 are formed on the reinforcing plate 241 at predetermined intervals based on the longitudinal direction d of the reinforcing plate 241. The reinforcing bars 242 are preferably formed at the same positions as the reinforcing ribs 2411.

[0101] The reinforcing bar 242 includes vertically drilled reinforcing holes 242h.

[0102] A bolt B may be inserted into the reinforcing hole 242h of the reinforcing bar 242, and the reinforcing plate 241 may be screwed to the bolt B inserted into the reinforcing hole 242h. Therefore, each battery module 100 accommodated in the battery pack of the present invention may be primarily supported by the reinforcing plate 241, and may be quadruple supported by the reinforcing ribs 2411 formed on the reinforcing plate 241, the reinforcing bar 242 extending vertically, and the bolt B inserted into the reinforcing hole 242h of the reinforcing bar 242.

[0103] Figure 12 shows an auxiliary partition wall 240 in which a first reinforcing plate 241a and a second reinforcing plate 241b are combined. As shown in Figure 12, the first reinforcing plate 241a is combined with the second reinforcing plate 241b so that each reinforcing rib 241a1 is inserted into the reinforcing groove 2412 of the second reinforcing plate 241b at a corresponding position, and the second reinforcing plate 241b is combined with the first reinforcing plate 241a so that each reinforcing rib 241b1 is inserted into the reinforcing groove 2412 of the second reinforcing plate 241b at a corresponding position.

[0104] In this case, the reinforcing ribs 2411 that are joined together but offset from each other form a strip extending along the longitudinal direction d of the reinforcing plate 241. That is, the reinforcing ribs 2411 that are interlocked with each other in symmetrical shapes contact each other so that their inclined surfaces coincide with each other to form a single strip. Therefore, one auxiliary partition 240 may have multiple strips formed by joining the reinforcing ribs 2411 along the height direction d2 of the reinforcing plate 241.

[0105] With the above-described structure, each battery module 100 accommodated in the battery pack of the present invention can be firmly supported by each of the strip-shaped reinforcing ribs 2411 and the reinforcing bar 242 formed perpendicularly to the strip-shaped reinforcing ribs 2411 along the longitudinal direction d of the reinforcing plate 241.

[0106] As shown in FIGS. 11 and 12, the reinforcing plate 241 includes protrusions 243 protruding upward from both ends thereof, and auxiliary coupling holes 243h drilled to penetrate the protrusions 243 in the horizontal direction.

[0107] A bolt B may be inserted into the auxiliary coupling hole 243h, and the reinforcing plate 241 may be screw-coupled to the bolt B inserted into the auxiliary coupling hole 243h.

[0108] 13 shows that a bolt B is inserted into each of the reinforcing holes 242h and the auxiliary joining holes 243h of one of the reinforcing plates 241. (However, for convenience, the specific structure of the bolt B, such as the threads, is omitted from the illustration.)

[0109] Referring to FIG. 13, one bolt B is inserted into and coupled to the reinforcing hole 242h of each reinforcing bar 242 formed at the same position in the longitudinal direction d of the reinforcing plate 241.

[0110] Further, a bolt B is inserted horizontally into an auxiliary coupling hole 243h formed at the end of the reinforcing plate 241 and coupled thereto.

[0111] The battery module 100 of the present invention can be fixed to the pack case 200 included in the battery pack by the bolts B inserted and coupled to the reinforcing holes 242h and the auxiliary coupling holes 243h.

[0112] Specifically, the auxiliary partition wall 240 may be fixedly coupled to the base plate 210 by a bolt B that passes vertically through the reinforcing hole 242h and is inserted into the coupling groove 210h of the base plate 210. The bolt B may be inserted into and coupled to each of the reinforcing holes 242h that are spaced apart at predetermined intervals along the longitudinal direction d of the reinforcing plate 241.

[0113] The bolts B inserted into the reinforcing holes 242h fix a pair of reinforcing plates 241 constituting the auxiliary partition wall 240 to the base plate 210. Therefore, even if gas is generated inside the battery module 100 accommodated in the module region A between the auxiliary partition walls 240, the swelling phenomenon of the battery module 100 can be suppressed by the bolts B arranged vertically along the side of the battery module 100 and the auxiliary partition wall 240 connected to the base plate 210 by the bolts B.

[0114] The auxiliary partition 240 may be installed such that the auxiliary coupling holes 243h of each reinforcing plate 241 correspond to the auxiliary coupling grooves 220h, 230h of the side wall 230 and the main partition 220. In this case, the auxiliary partition 240 may be fixedly coupled to the side wall 230 and the main partition 220 by bolts B that horizontally pass through the auxiliary coupling holes 243h and are inserted into the auxiliary coupling grooves 220h, 230h. Therefore, the auxiliary partition 240 installed inside the pack case 200 may be fixedly coupled to not only the base plate 210 but also the side wall 230 and the main partition 220 to support the battery module 100.

[0115] The battery pack of the present invention may further include an upper cover (not shown) coupled to the pack case 200 to cover the upper portion of each battery module 100 accommodated in the module area A of the pack case 200.

[0116] The upper cover is a well-known technology, and therefore a detailed description thereof will be omitted.

[0117] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, so it should be understood that there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0118] 10: (Prior Art) Battery Module 11: (Conventional technology) Module frame 12: (Prior Art) End Plate 20: (Conventional technology) Pack case 21: (Prior Art) Base Plate 22: (Prior Art) Sidewall 23: (Conventional) Partition 100: Battery module 200: Pack case 210: Base plate 210h: Binding groove 220: Main bulkhead 230: Side wall 220h, 230h: Auxiliary coupling groove 240: Auxiliary bulkhead 241: Reinforcement plate 241a: 1st reinforcement plate 241a1: Reinforcing rib of the first reinforcing plate 241b:Second reinforcing plate 241b1: Reinforcement rib of the second reinforcing plate 2411: Reinforcement rib 2411h: Through hole 2412: Reinforcement groove 242: Reinforcement bar 242h: Reinforcement hole 243:Protrusion 243h: Auxiliary coupling hole A: Module area B: Bolt d: Longitudinal direction of the reinforcing plate d2: Height direction of the reinforcing plate

Claims

1. A battery pack accommodating a battery module including a cell stack in which a plurality of cells are stacked, a pack case including a module area in which the battery module is placed, The pack case is a base plate that supports a lower portion of the battery module; a main partition wall extending across the base plate and vertically coupled to a center of the base plate; a sidewall coupled vertically along the periphery of the base plate; an auxiliary partition wall, both ends of which are connected to the main partition wall and the side wall, the auxiliary partition wall including a pair of reinforcing plates connected to each other; wherein the reinforcing plate includes a plurality of reinforcing ribs formed to protrude, the reinforcing ribs extending along a longitudinal direction of the reinforcing plate.

2. The battery pack according to claim 1 , wherein the reinforcing ribs are formed at predetermined intervals along a longitudinal direction of the reinforcing plate.

3. The battery pack according to claim 2 , wherein the reinforcing plate includes a curved reinforcing groove between a pair of reinforcing ribs spaced apart along the longitudinal direction of the reinforcing plate.

4. The battery pack according to claim 3 , wherein the reinforcing groove has the same shape as the reinforcing rib so that the reinforcing rib can be inserted into the reinforcing groove.

5. The battery pack according to claim 4 , wherein the reinforcing ribs and the reinforcing grooves are alternately formed along the longitudinal direction of the auxiliary partition.

6. The battery pack according to claim 1 , wherein the reinforcing rib has at least one of a trapezoidal shape and a parabolic shape.

7. The battery pack of claim 1 , wherein the reinforcing ribs are spaced apart from each other by a predetermined distance along a height direction of the reinforcing plate.

8. The auxiliary partition wall includes a first reinforcing plate having a reinforcing rib formed on one side thereof; a second reinforcing plate having a reinforcing rib formed on one side thereof facing the first reinforcing plate; Including, The battery pack of claim 7 , wherein the reinforcing ribs included in the first reinforcing plate and the second reinforcing plate are formed to have heights corresponding to each other.

9. The reinforcing plate includes a curved reinforcing groove between a pair of reinforcing ribs spaced apart along the longitudinal direction of the reinforcing plate, The battery pack according to claim 8 , wherein the first reinforcing plate is coupled to the second reinforcing plate such that the reinforcing ribs and the reinforcing grooves of the first reinforcing plate are engaged with the reinforcing grooves and the reinforcing ribs of the second reinforcing plate.

10. the first reinforcing plate is coupled to the second reinforcing plate such that each reinforcing rib is inserted into a corresponding reinforcing groove of the second reinforcing plate; The battery pack according to claim 8 , wherein the second reinforcing plate is coupled to the first reinforcing plate such that each reinforcing rib is inserted into a reinforcing groove of the first reinforcing plate at a corresponding position.

11. The battery pack according to claim 1 , wherein the reinforcing plate includes a through-hole drilled to perpendicularly penetrate the reinforcing rib.

12. the pack case includes a coupling groove formed in a bottom of the module area corresponding to a position of the through hole, The battery pack according to claim 11 , wherein the auxiliary partition is coupled to the pack case by a bolt that passes through the through hole and is inserted into the coupling groove.

13. The reinforcing plate further includes a reinforcing bar extending vertically through the reinforcing rib, The battery pack according to claim 1 , wherein the reinforcing bar includes a reinforcing hole drilled vertically therethrough.

14. the pack case includes a coupling groove formed in a bottom of the module area corresponding to a position of the reinforcing hole, The battery pack according to claim 13 , wherein the auxiliary partition is coupled to the pack case by a bolt that passes through the reinforcing hole and is inserted into the coupling groove.

15. The reinforcing plate includes auxiliary connection holes drilled horizontally through both ends thereof, the side wall and the main partition wall each include an auxiliary coupling groove formed to correspond to the auxiliary coupling hole of the auxiliary partition wall; The battery pack of claim 1 , wherein the auxiliary partition is coupled to the pack case by a bolt that passes through the auxiliary coupling hole and is inserted into the auxiliary coupling groove.

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