Battery pack

Abstract

The present invention relates to a battery pack accommodating a cell stack including one or more battery cells, the battery pack including a pack case providing a space in which the cell stack is placed, the pack case including a base plate supporting a lower portion of the cell stack, a main partition wall extending across the base plate and coupled to a center of the base plate, a hollow side wall including a gas exhaust passage therein and coupled along an outer periphery of the base plate, and a plurality of auxiliary partition walls having a front end coupled to the main partition wall and a rear end coupled to the side wall, the auxiliary partition wall including a first partition member including a pair of ribs extending along a longitudinal direction of the auxiliary partition wall on one side, and a second partition member coupled to the first partition member, and at least one of the first partition member and the second partition member includes a first hole penetrating between the ribs included in the first partition member.

Description

[Technical Field]

[0001] The present invention relates to a battery pack. More specifically, the battery pack of the present invention houses a plurality of cell stacks each including one or more battery cells, and has a feature that the battery pack can release high-temperature gas generated inside to the outside by using auxiliary partitions that separate the cell stacks and have gas flow paths inside.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0068280, dated June 3, 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 / parallel, a cell stack consisting of a plurality of battery cells is first constructed, and then other components are added to the cell stack to construct the battery pack.

[0005] A cell stack refers to a component in which a number of secondary batteries are connected in series or parallel, and a battery pack refers to a component in which a number of cell stacks are connected in series or parallel to increase capacity, output, etc.

[0006] Figure 1(a) is an exploded perspective view of a typical cell stack installed in a battery pack. Referring to Figure 1(a), a bus bar frame and an end plate are respectively coupled to the front and rear surfaces of the cell stack, which is formed by stacking multiple battery cells. The cell stack can also be protected by being surrounded by a U-shaped module frame, as shown in Figure 1(b).

[0007] Meanwhile, it is important for a battery pack to easily release high-temperature gases generated in each cell stack. If the high-temperature gases generated during the charge / discharge process are not effectively removed, heat accumulation can accelerate deterioration of the cell stack, and in some cases, fire or explosion can occur. Furthermore, the heat from the gases can be transferred to other cell stacks that are operating normally, causing problems such as deterioration or explosion of all battery cells housed inside the battery pack. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 10-2022-0014027 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a battery pack that can quickly discharge high-temperature gas to the outside when deterioration occurs in one of a plurality of cell stacks and the gas is released.

[0010] Another object of the present invention is to provide a battery pack that can prevent heat from being transferred to other adjacent cell stacks when deterioration occurs in one of a plurality of cell stacks and high-temperature gas is released.

[0011] 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]

[0012] According to the present invention, there is provided a battery pack accommodating a cell stack including one or more battery cells, the battery pack including: a pack case providing a space in which the cell stack is placed; a base plate supporting a lower portion of the cell stack; a main partition wall extending across the base plate and coupled to a center of the base plate; a hollow side wall having a gas exhaust passage therein and coupled to the periphery of the base plate; and a plurality of auxiliary partition walls, the front end of which is coupled to the main partition wall and the rear end of which is coupled to the side wall; the auxiliary partition wall including: a first partition member having a pair of ribs formed to extend along a longitudinal direction of the auxiliary partition wall on one side; and a second partition member coupled to the first partition member, and at least one of the first partition member and the second partition member includes a first hole penetrating between the ribs included in the first partition member.

[0013] The auxiliary partitions may be disposed on both sides of the main partition at regular intervals along the longitudinal direction of the main partition.

[0014] The pair of ribs may be formed vertically spaced apart by a predetermined distance.

[0015] The second compartment member may be coupled to the first compartment member in a direction opposite to the ribs of the first compartment member.

[0016] The auxiliary barrier rib may include a plurality of the first holes on one side.

[0017] The first partitioning member may have a rear surface that is perforated so that the space between the pair of ribs is open toward the rear end of the first partitioning member.

[0018] The auxiliary partition may have a rear end inserted into the side wall so that the open portion communicates with the gas discharge path.

[0019] The auxiliary partition wall includes a gas flow path formed by closing the top and bottom surfaces by the pair of ribs and closing both side surfaces by a first partition member and a second partition member, and the gas flow path can be opened to the outside through the first hole and the opening portion, respectively.

[0020] The second partition member may include a pair of ribs formed to extend along the longitudinal direction on one side, and the auxiliary partition wall may include a second hole penetrating between the ribs included in the second partition member on the other side opposite to the side on which the first hole is formed.

[0021] The ribs of the second partitioning member may be formed so as not to overlap with the ribs formed on the first partitioning member.

[0022] The ribs of the second partition member may be formed to be located above a pair of ribs formed on the first partition member, and the first and second holes may be formed at the bottom and top, respectively, on both sides of the auxiliary partition wall.

[0023] The first and second partition members may have rear surfaces that are perforated so that the space between the pair of ribs is open toward the rear end of each partition member.

[0024] The auxiliary partition wall may have a rear end inserted into the side wall so that the upper and lower open portions communicate with the gas discharge passage.

[0025] The auxiliary barrier rib may include a plurality of the first holes and a plurality of the second holes on both sides.

[0026] The auxiliary partition wall includes an upper gas flow path located at an upper portion, the upper and lower surfaces of which are closed by a pair of ribs formed on the second partition member and both side surfaces of which are closed by the first partition member and the second partition member, and a lower gas flow path located at a lower portion, the upper and lower surfaces of which are closed by a pair of ribs formed on the first partition member and both side surfaces of which are closed by the first partition member and the second partition member, and the upper gas flow path and the lower gas flow path may not be connected to each other within the auxiliary partition wall. [Effects of the Invention]

[0027] According to the present invention, even if deterioration occurs in a cell stack housed in a battery pack and high-temperature gas is generated, the battery pack can be prevented from catching fire or exploding.

[0028] Furthermore, the present invention can prevent the phenomenon of heat transfer caused by high-temperature gas generated in a cell stack being transferred to another adjacent cell stack.

[0029] Furthermore, according to the present invention, a plurality of ribs may be applied to the partition walls that are installed in the battery pack and separate the cell stacks, thereby improving rigidity and forming passages through which gas can move. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 10 is an exploded perspective view of a conventional cell stack. [Figure 2] FIG. 1 is a perspective view of a pack case according to the present invention. [Figure 3] 1 shows the auxiliary bulkhead coupled to the base plate. [Figure 4] FIG. 2 is a front perspective view of an auxiliary partition included in the battery pack according to the first embodiment. [Figure 5]FIG. 5 is a rear perspective view of the auxiliary partition wall of FIG. 4. [Figure 6] FIG. 5 is an exploded perspective view of the auxiliary partition wall of FIG. 4. [Figure 7] FIG. 2 is a plan view of the pack case of the battery pack according to the first embodiment. [Figure 8] 10 shows a first partition member of an auxiliary partition wall included in a battery pack according to a second embodiment. [Figure 9] 9 is a perspective view of an auxiliary partition wall including the first partition member of FIG. 8. FIG. [Figure 10] FIG. 11 is a front perspective view of an auxiliary partition included in a battery pack according to a third embodiment. [Figure 11] FIG. 11 is a rear perspective view of the auxiliary partition wall of FIG. 10. [Figure 12] FIG. 11 is an exploded perspective view of the auxiliary partition wall of FIG. 10. [Figure 13] 13 is a side view of a second partition member included in the auxiliary partition wall of FIG. 12. FIG. [Figure 14] FIG. 14 is a perspective view of the second partition member of FIG. [Figure 15] 13 is a side view of a first partition member included in the auxiliary partition wall of FIG. 12. FIG. [Figure 16] FIG. 16 is a perspective view of the first partition member of FIG. [Figure 17] FIG. 10 is a perspective view of a pack case included in a battery pack according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] The present invention relates to a battery pack having a structure that separates the spaces in which a plurality of cell stacks are housed and that can quickly release high-temperature gas to the outside even if the gas is generated in any one of the cell stacks. In this case, the cell stack may be in the form of one or more stacked battery cells as shown in Fig. 1(a), or in the form of a battery module surrounded by a module frame as shown in Fig. 1(b).

[0036] The battery pack of the present invention includes a pack case 1000 that provides a space in which the cell stack is placed.

[0037] FIG. 2 shows a perspective view of the pack case 1000 of the present invention.

[0038] 2, the pack case 1000 includes a base plate 100, a main partition 200, a side wall 300, and an auxiliary partition 400. The battery pack of the present invention may further include an upper cover (not shown) in addition to the pack case 1000. The upper cover may be combined with the pack case 1000 to form a housing that accommodates a plurality of cell stacks.

[0039] The base plate 100 is located at the bottom of the battery pack, and is configured to seat the cell stack and support the bottom of the cell stack.

[0040] The main partition wall 200 is formed to extend across the base plate 100 and is coupled to the center of the base plate 100 .

[0041] The main partition wall 200 largely divides the space inside the pack case 1000 into two sections, and the cell stacks on both sides are mounted on the base plate 100 symmetrically with respect to the main partition wall 200. That is, the cell stack on one side of the main partition wall 200 and the cell stack on the other side of the main partition wall 200 are separated by the main partition wall 200.

[0042] Electric wires or bus bars electrically connected to the cell stacks mounted on the base plate 100 may be located within the main partition wall 200. Each cell stack is mounted on the base plate 100 with its end plate facing the main partition wall 200.

[0043] The side wall 300 has a hollow shape and is coupled to the base plate 100 along the periphery thereof.

[0044] The sidewalls 300 support the sides of the cell stack mounted on the base plate 100 and protect them from the outside.

[0045] The side wall 300 having the hollow structure includes a gas discharge path 331 through which gas can move inside.

[0046] As shown in FIG. 2, the side wall 300 is made up of a front frame 310, a rear frame 320, and a pair of side frames 330.

[0047] The front frame 310 and the rear frame 320 support one side of the cell stack located at the outermost corner, and the side frame 330 supports the rear of the seated cell stack.

[0048] The gas discharge passage 331 is preferably included in the side frame 330. In addition, a gas discharge passage 331 may be formed in a part of the front frame 310 or the rear frame 320 so as to communicate with the gas discharge passage 331 of the side frame 330.

[0049] The side wall 300 may further include a gas outlet 321 that penetrates the gas outlet path 331 formed in the side wall 300 to open to the outside.

[0050] The auxiliary partition wall 400 is coupled to the base plate 100 so as to re-partition the receiving space P partitioned by the main partition wall 200 .

[0051] FIG. 3 shows the auxiliary bulkhead 400 coupled with the base plate 100 .

[0052] The auxiliary partition wall 400 formed by combining the first partition member 411 and the second partition member 412 has both ends coupled to the main partition wall 200 and the side wall 300, respectively, as shown in FIG.

[0053] 2, the auxiliary barrier ribs 400 are arranged on both sides of the main barrier rib 200 at a predetermined interval along the longitudinal direction of the main barrier rib 200. At this time, cell stacks are accommodated in the accommodation spaces P partitioned by the main barrier rib 200 and a pair of adjacent auxiliary barrier ribs 400.

[0054] The auxiliary partition wall 400 of the present invention is formed by combining a pair of partition members, and is characterized by including a gas flow path 420 formed by a rib L structure formed on the combined surfaces of the partition members, and a through hole that connects the gas flow path 420 to the receiving space P.

[0055] In the battery pack of the present invention, the auxiliary partition 400 can be divided into several embodiments according to the rib L structure and the hole structure.

[0056] 4 to 7 relate to the auxiliary partition 400 included in the battery pack according to the first embodiment, FIGS. 8 to 9 relate to the auxiliary partition 400 included in the battery pack according to the second embodiment, and FIGS. 10 to 17 relate to the auxiliary partition 400 included in the battery pack according to the third embodiment.

[0057] Each embodiment will be described below with reference to the above drawings.

[0058] (First embodiment) FIG. 4 is a front perspective view of an auxiliary partition 400 included in the battery pack according to the first embodiment, and FIG. 5 is a rear perspective view of the auxiliary partition 400 of FIG.

[0059] The auxiliary partition 400 includes a main fastening portion J1 protruding forward from a front end thereof, and is coupled to the main partition 200 by inserting the main fastening portion J1 into the main partition 200. In this case, the auxiliary partition 400 may be fixed to the main partition 200 by screwing the inserted main fastening portion J1 and the main partition 200 together.

[0060] The auxiliary partition 400 has a hollow structure. Specifically, the auxiliary partition 400 includes a gas passage 420 extending in a longitudinal direction to allow gas to move inside, an opening 430 at a rear end of the auxiliary partition 400 to open the gas passage 420 to the outside, and a first hole 411h formed through one side of the auxiliary partition 400 to open the gas passage 420 to the outside.

[0061] The auxiliary partition 400 has a front end, where the main fastening portion J1 is formed, inserted into and coupled to the main partition 200, and a rear end, which is inserted into and coupled to the side wall 300, so that the opening 430 communicates with the gas discharge path 331 of the side wall 300. At this time, the first hole 411h connects any one of the receiving spaces P defined by the auxiliary partition 400 to the gas passage 420. Therefore, the receiving space P communicates with the gas discharge path 331 of the side wall 300 through the gas passage 420.

[0062] As shown in FIG. 4, the front end of the gas flow passage 420 is closed by a main fastening portion J1 or other components, and the rear end is opened by an opening portion 430.

[0063] An upper fastening part J2 that can be coupled to an upper cover coupled to the pack case 1000 may be formed on the upper part of the auxiliary partition 400 to cover the cell stack accommodated in the pack case 1000.

[0064] FIG. 6 is an exploded perspective view of the auxiliary partition wall 400 of FIG.

[0065] As shown in FIG. 6, the auxiliary partition wall 400 includes a first partition member 411 and a second partition member 412 connected to the first partition member 411 .

[0066] 6, the first partition member 411 may include a partition wall fastening portion J3 that penetrates vertically and can be threadedly coupled to an inner surface coupled to the second partition member 412. More specifically, the partition wall fastening portion J3 included in the first partition member 411 is preferably formed on each of the ribs L as shown in FIG.

[0067] The second partition member 412 may also include a partition wall fastening portion J3 drilled vertically on an inner surface thereof to be coupled to the first partition member 411 so as to be threadably coupled. The partition wall fastening portions J3 included in the first partition member 411 and the second partition member 412 are preferably formed at vertically corresponding positions. Therefore, when the first partition member 411 and the second partition member 412 are coupled to each other, the partition wall fastening portions J3 formed on each partition member overlap each other at vertically corresponding positions, and the first partition member 411 and the second partition member 412 are coupled to each other by bolts or the like passing through the partition wall fastening portions J3 formed on each partition member. The bolts passing through the partition wall fastening portions J3 may also pass through the base plate 100 of the pack case 1000 to couple and fix the auxiliary partition 400 to the base plate 100. At this time, the bolts penetrate the ribs L of the first partition member 411 in the vertical direction and are coupled to the auxiliary partition wall 400.

[0068] The first partition member 411 includes a pair of ribs L extending along the longitudinal direction of the auxiliary partition wall 400 .

[0069] The pair of ribs L are formed vertically at a predetermined interval, and the first partition member 411 including the ribs L is coupled to the second partition member 412, so that the space between the ribs L forms the gas flow path 420. That is, the second partition member 412 covers the space between the ribs L, thereby forming the gas flow path 420 in a passage shape.

[0070] That is, the auxiliary partition wall 400 of the present invention includes a gas flow path 420 that is closed at the top and bottom by the pair of ribs L and closed at both sides by the first partition member 411 and the second partition member 412 .

[0071] The gas flow path 420 is formed such that the upper and lower surfaces are closed by the pair of ribs L, and both side surfaces are closed by the first partition member 411 and the second partition member 412.

[0072] The first partitioning member 411 is perforated at its rear surface by extending into the space between the pair of ribs L so that the space between the pair of ribs L is open toward the rear end of the first partitioning member 411, and it is preferable that the second partitioning member 412 has an open structure at its rear surface corresponding to the perforated area of ​​the first partitioning member 411 so that the perforated area is not blocked when combined with the first partitioning member 411, as shown in FIG. 5.

[0073] The perforated area forms an opening 430 of the auxiliary partition wall 400 by combining the first partition member 411 and the second partition member 412 .

[0074] In addition, at least one of the first partitioning member 411 or the second partitioning member 412 coupled to the first partitioning member 411 includes a first hole 411h penetrating between the ribs L included in the first partitioning member 411.

[0075] Therefore, the gas flow path 420 formed by combining the first partitioning member 411 and the second partitioning member 412 can be opened to the outside through the opening 430 and the first hole 411h.

[0076] FIG. 7 is a plan view of the pack case 1000 of the battery pack according to the first embodiment.

[0077] Referring to the enlarged partial view and gas movement path of Figure 7, gas Gp moving through the gas flow path 420 formed in the auxiliary partition 400 and the side wall 300 connected to the auxiliary partition 400, i.e., the gas exhaust path 331 of the side frame 330, is discharged to the outside through the gas exhaust port 321 of the rear frame 320 connected to the side frame 330.

[0078] In the battery pack according to the first embodiment of the present invention, as shown in FIG. 7, even if high-temperature gas is generated in any one of the accommodation spaces P in which the cell stack is accommodated, the gas can be effectively discharged to the outside through the auxiliary partition 400.

[0079] (Second embodiment) FIG. 8 shows a first partition member 411 of an auxiliary partition 400 included in a battery pack according to the second embodiment, and FIG. 9 shows a perspective view of the auxiliary partition 400 including the first partition member 411 of FIG. 8.

[0080] The battery pack according to the second embodiment of the present invention is characterized in that the auxiliary partition 400 has a plurality of first holes 411h formed on one side thereof.

[0081] 8 and 9, the auxiliary partition 400 included in the battery pack according to the second embodiment of the present invention includes at least two first holes 411h formed through at least one of the first partitioning member 411 and the second partitioning member 412 so that the gas passage 420 communicates with the accommodating space P. The plurality of first holes 411h are preferably formed adjacent to both ends of the auxiliary partition 400, as shown in the drawings.

[0082] When the first holes 411h are formed adjacent to both ends of the auxiliary barrier rib 400 as described above, the gas generated in the cell stack can move on the outer surfaces of the main barrier rib 200 and the side wall 300 while being blocked by the main barrier rib 200 and the side wall 300, and can effectively flow into the first holes 411h formed at both ends of the auxiliary barrier rib 400.

[0083] (Third embodiment) FIG. 10 is a front perspective view of an auxiliary partition 400 included in a battery pack according to the third embodiment, and FIG. 11 is a rear perspective view of the auxiliary partition 400 included in a battery pack according to the third embodiment.

[0084] 10, the auxiliary partition 400 includes a main fastening portion J1 protruding forward from a front end thereof, and is coupled to the main partition 200 by inserting the main fastening portion J1 into the main partition 200. In this case, the auxiliary partition 400 may be fixed to the main partition 200 by screwing the inserted main fastening portion J1 and the main partition 200 together.

[0085] In addition, an upper fastening portion J2 may be formed on the upper portion of the auxiliary partition wall 400 to cover the cell stack accommodated in the pack case 1000 and to be connectable with an upper cover connected to the pack case 1000.

[0086] The battery pack according to the third embodiment of the present invention is characterized in that both the first partitioning member 411 and the second partitioning member 412 have a rib L configuration.

[0087] More specifically, the battery pack according to the third embodiment of the present invention includes an auxiliary partition 400 including a first partition member 411 having a pair of ribs L formed on one side thereof and extending along the longitudinal direction, and a second partition member 412 coupled to the first partition member 411 and having a pair of ribs L formed on one side thereof and extending along the longitudinal direction.

[0088] That is, the first partition member 411 and the second partition member 412 of the auxiliary partition wall 400 included in the battery pack according to the third embodiment each include a pair of ribs L on the inner surfaces facing each other.

[0089] 12 is an exploded perspective view of an auxiliary partition 400 included in a battery pack according to the third embodiment, FIG. 13 is a side view of a second partition member 412 included in the auxiliary partition 400 of FIG. 12, FIG. 14 is a perspective view of the second partition member 412 of FIG. 13, FIG. 15 is a side view of a first partition member 411 included in the auxiliary partition 400 of FIG. 12, and FIG. 16 is a perspective view of the first partition member 411 of FIG. 15.

[0090] As shown in FIG. 12 above, each of the first partition member 411 and the second partition member 412 includes a pair of ribs L.

[0091] As shown in FIG. 12, the rib L of the second partitioning member 412 is located at the top so as not to overlap with the rib L of the first partitioning member 411, and the rib L of the first partitioning member 411 is located at the bottom so as not to overlap with the rib L of the second partitioning member 412.

[0092] A space between a pair of ribs L formed on an upper portion of the second partitioning member 412 forms an upper gas passage 421 by combining the first partitioning member 411 and the second partitioning member 412. Also, a space between a pair of ribs L formed on a lower portion of the first partitioning member 411 forms a lower gas passage 422 by combining the second partitioning member 412 and the first partitioning member 411. Here, the upper gas passage 421 and the lower gas passage 422 are designed to be separated and disconnected from each other and not to communicate with each other. Therefore, it is preferable that a predetermined interval be spaced between the lower rib L of the pair of ribs L formed on the second partitioning member 412 and the upper rib L of the pair of ribs L formed on the first partitioning member 411.

[0093] Therefore, the upper gas flow passage 421 of the auxiliary partition 400 included in the battery pack according to the third embodiment is formed such that its top and bottom surfaces are closed by a pair of ribs L formed on the second partition member 412, and its both side surfaces are closed by the first partition member 411 and the second partition member 412. In addition, the lower gas flow passage 422 is formed such that its top and bottom surfaces are closed by a pair of ribs L formed on the first partition member 411, and its both side surfaces are closed by the first partition member 411 and the second partition member 412.

[0094] The first and second partitioning members 411 and 412 extend into the space between the ribs L and have their rear surfaces penetrated, as shown in Fig. 12, so that the space between the pair of ribs L is open toward the rear end of each partitioning member. Therefore, the auxiliary partition 400 included in the battery pack according to the third embodiment includes an upper opening 431 located at the top and a lower opening 432 located at the bottom, as shown in Fig. 11, formed by combining the first and second partitioning members 411 and 412.

[0095] The upper open portion 431 communicates with the upper gas passage 421 , and the lower open portion 432 communicates with the lower gas passage 422 .

[0096] The auxiliary partition 400 included in the battery pack according to the third embodiment of the present invention has a rear end inserted into the side wall 300 so that the upper opening 431 and the lower opening 432 communicate with the gas discharge path 331 of the side wall 300.

[0097] 12 to 14, the second partition member 412 may include a partition wall fastening portion J3 that penetrates vertically and can be screwed onto an inner surface that is coupled to the first partition member 411. More specifically, the partition wall fastening portion J3 included in the second partition member 412 is preferably formed on each rib L.

[0098] 12, 15 and 16, the first partition member 411 may include a partition fastening portion J3 drilled vertically to be screw-connectable on an inner surface to be connected to the second partition member 412. More specifically, the partition fastening portion J3 included in the first partition member 411 is preferably formed on each rib L corresponding to the position of the partition fastening portion J3 of the second partition member 412. That is, the partition fastening portions J3 included in the first partition member 411 and the second partition member 412 are preferably formed at positions corresponding to each other vertically.

[0099] Therefore, when the first partition member 411 and the second partition member 412 are joined together, the partition wall fastening portions J3 formed on the respective partition members are positioned to vertically align with each other, and the first partition member 411 and the second partition member 412 are joined together by bolts or the like passing through the partition wall fastening portions J3 formed on the respective partition members. At this time, the bolts passing through the respective partition wall fastening portions J3 can also pass through the base plate 100 of the pack case 1000 to join and fix the auxiliary partition wall 400 to the base plate 100. At this time, the bolts pass vertically through the ribs L of the first partition member 411 and are joined to the auxiliary partition wall 400.

[0100] The auxiliary partition 400 included in the battery pack according to the third embodiment of the present invention has holes formed on both sides thereof. Specifically, the auxiliary partition 400 includes a first hole 411h on one side thereof that is penetrated to communicate with the lower gas passage 422, and a second hole 412h on the other side thereof that is penetrated to communicate with the upper gas passage 421.

[0101] The first hole 411h is formed through the lower part of the first partition member 411 to communicate with the lower gas passage 422, and the second hole 412h is formed through the lower part of the second partition member 412 to communicate with the upper gas passage 421.

[0102] The auxiliary barrier 400 may include a plurality of first holes 411h and a plurality of second holes 412h on both sides, similar to the auxiliary barrier 400 included in the battery pack according to the second embodiment.

[0103] FIG. 17 is a perspective view of a pack case 1000 included in a battery pack according to a third embodiment of the present invention.

[0104] 17, the first hole 411h and the second hole 412h are formed on both sides of the auxiliary partition 400 and communicate with the respective accommodating spaces P. That is, any one accommodating space P may be formed by the main partition 200, the side wall 300, and at least one auxiliary partition 400.

[0105] The storage space P partitioned by auxiliary partitions 400 on both sides may be connected simultaneously to the first hole 411h of one of the auxiliary partitions 400 and the second hole 412h of the remaining auxiliary partition 400, and the storage space P partitioned by an auxiliary partition 400 on one side and a side wall 300 on the other side may be connected to the first hole 411h or the second hole 412h of the auxiliary partition 400.

[0106] 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]

[0107] 10: (Prior Art) Cell Stack 1: (Conventional technology) Battery cell 2: (Conventional technology) Busbar frame 3: (Conventional technology) End plate 4: (Conventional technology) Module frame 1000: Pack case 100: Base plate 200: Main bulkhead 300: Side wall 310: Front frame 320: Rear frame 321: Gas outlet 330: Side frame 331: Gas exhaust channel 400: Auxiliary bulkhead 411: First compartment member 411h: 1st hole 412: Second compartment member 412h: 2nd hole 420: Gas flow path 421: Upper gas passage 422: Lower gas passage 430:Open part 431:Top open part 432: Lower opening part L: Rib P: Containment space J1: Main connection part J2: Upper fastening part J3: Bulkhead fastening part Gp: Gas transfer (pathway)

Claims

1. A battery pack containing a cell stack including one or more battery cells, a pack case that provides a space in which the cell stack is placed, The pack case is a base plate supporting a lower portion of the cell stack; a main partition wall extending across the base plate and coupled to a center portion of the base plate; a hollow sidewall including a gas discharge passage therein and coupled along the periphery of the base plate; and a plurality of auxiliary bulkheads each having a front end connected to the main bulkhead and a rear end connected to the sidewall; The auxiliary partition wall includes a first partition member having a pair of ribs formed on one side thereof and extending along a longitudinal direction of the auxiliary partition wall, and a second partition member coupled to the first partition member, At least one of the first partitioning member and the second partitioning member includes a first hole penetrating between ribs included in the first partitioning member, The pair of ribs are formed vertically at a predetermined interval, the first partition member has a rear end penetrated so that the space between the pair of ribs is open toward the rear end of the first partition member; a rear end of the auxiliary partition wall is inserted into the side wall so that an open portion thereof communicates with the gas discharge channel; The auxiliary partition wall is a gas flow path formed by closing upper and lower surfaces by the pair of ribs and closing both side surfaces by a first partition member and a second partition member, The gas flow path is open to the outside through the first hole and the opening.

2. The battery pack according to claim 1 , wherein the auxiliary partitions are disposed on both sides of the main partition at regular intervals along a longitudinal direction of the main partition.

3. The battery pack according to claim 1 , wherein the second partition member is coupled to the first partition member in a direction opposite to a rib of the first partition member.

4. The battery pack of claim 1 , wherein the auxiliary partition includes a plurality of the first holes on one side.

5. The second partition member includes a pair of ribs formed on one side thereof and extending along the longitudinal direction, 2. The battery pack of claim 1, wherein the auxiliary partition wall includes a second hole penetrating between ribs included in the second partition member on the other side opposite to the side where the first hole is formed.

6. The battery pack according to claim 5 , wherein the ribs of the second partitioning member are formed so as not to overlap with the ribs formed on the first partitioning member.

7. The ribs of the second partitioning member are formed to be located above a pair of ribs formed on the first partitioning member, The battery pack of claim 5 , wherein the first hole and the second hole are formed at a lower portion and an upper portion, respectively, on both sides of the auxiliary partition wall.

8. The battery pack according to claim 5 , wherein the rear ends of the first and second partition members are perforated so that the space between the pair of ribs is open toward the rear end of each partition member.

9. The battery pack according to claim 8 , wherein a rear end of the auxiliary partition is inserted into the side wall so that an upper open portion and a lower open portion communicate with the gas discharge passage.

10. The battery pack of claim 5 , wherein the auxiliary partition includes a plurality of the first holes and a plurality of the second holes on both sides thereof.

11. The auxiliary partition wall is an upper gas flow path located at an upper portion, the upper and lower surfaces of which are closed by a pair of ribs formed on the second partition member, and both side surfaces of which are closed by the first partition member and the second partition member; a pair of ribs formed on the first partition member to close upper and lower surfaces, and a lower gas flow path formed by closing both side surfaces by the first partition member and the second partition member, the lower gas flow path being located at a lower portion; The battery pack according to claim 5 , wherein the upper gas flow passage and the lower gas flow passage do not communicate with each other within the auxiliary partition wall.

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