Battery Module

Abstract

The present invention relates to a battery module in which a separation structure having an easily fastened form delays the transfer of flames and high-temperature gases between cells or cell stacks due to heat generated from inside, thereby improving stability and improving structural rigidity to prevent deformation and collapse of the structure due to heat. The battery module according to the present invention includes a cell stack in which a plurality of cells are stacked, and a partition wall disposed between adjacent cell stacks to separate the cell stacks from each other, the partition wall including a horizontal partition wall having a horizontal fastening space extending in a height direction and an inner groove extending in a height direction formed on an inner side forming the horizontal fastening space, and a vertical partition wall having a vertical fastening space disposed perpendicular to the horizontal partition wall and extending in the height direction, the vertical partition wall including a protrusion on a side in contact with the horizontal partition wall that is configured to engage with the inner groove, and the inner groove and the protrusion may be fastened so that a part of the vertical partition wall is sandwiched in the horizontal fastening space and a part of the horizontal partition wall is sandwiched in the vertical fastening space, and the inner groove and the protrusion are fixed to each other by being engaged with each other.

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0041883 filed on April 4, 2022 and Korean Patent Application No. 10-2022-0153101 filed on November 15, 2022, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to a battery module, and more particularly to a secondary battery module including a plurality of cells. [Background technology]

[0003] In recent years, with rising energy prices due to the depletion of fossil fuels and growing concern over environmental pollution, the demand for eco-friendly alternative energy sources has become an essential factor for future life. Therefore, research into various power generation technologies such as solar, wind, and tidal power has been ongoing, and there has also been great interest in power storage devices such as batteries to more efficiently use the electrical energy produced in this way.

[0004] Furthermore, as technological development and demand for battery-based electronic mobile devices and electric vehicles increases, the demand for batteries as an energy source is rapidly increasing, and much research is being conducted on batteries that can meet the various demands.

[0005] Batteries that store electrical energy can generally be classified into primary batteries and secondary batteries. Primary batteries are disposable, consumable batteries, whereas secondary batteries are rechargeable batteries manufactured using materials that can undergo repeated oxidation and reduction processes between electric current and materials. That is, when a reduction reaction occurs on a material due to electric current, the power source is charged, and when an oxidation reaction occurs on the material, the power source is discharged. Electricity is generated by repeating this charge-discharge cycle.

[0006] Meanwhile, as the need for a large capacity structure increases along with the recent use of batteries as an energy storage source, the demand for battery packs in which a number of secondary batteries or battery modules are assembled is increasing, and accordingly, the demand for battery modules is also increasing.

[0007] When a battery module is used, heat is generated from the internal cells, and there is a possibility that the heat and high-temperature gas may diffuse inside. In this case, the battery module may include a separation structure to prevent heat from diffusing between the cell stacks and to delay the transfer of flames and high-temperature gas.

[0008] The separation structure of a conventional battery module does not efficiently retard flames and high-temperature gases, the fastening method is complicated, and it is difficult to retard flame transfer at the cell level.

[0009] In order to solve these problems, a battery module including a different type of separation structure is required. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery module in which an easily fastened separation structure can delay the transfer of flames and high-temperature gases between cells or cell stacks due to heat generated from inside, thereby improving stability, and improving structural rigidity to prevent deformation and collapse of the structure due to heat. [Means for solving the problem]

[0011] The battery module according to the present invention may include a cell stack in which a plurality of cells are stacked, and partition walls disposed between adjacent cell stacks to separate the cell stacks from each other, the partition walls including a horizontal partition wall having a horizontal fastening space extending in a height direction and an inner groove extending in a height direction formed on an inner side forming the horizontal fastening space, and a vertical partition wall having a vertical fastening space disposed perpendicular to the horizontal partition wall and extending in the height direction, the vertical partition wall including a protrusion on a side in contact with the horizontal partition wall that is configured to engage with the inner groove, and the inner groove and the protrusion may be fastened to each other so that a portion of the vertical partition wall is sandwiched in the horizontal fastening space and a portion of the horizontal partition wall is sandwiched in the vertical fastening space, and the inner groove and the protrusion are fastened to each other so that they are fixed to each other by being engaged with each other.

[0012] The battery module may further include a frame surrounding a lower surface and a side surface of the cell stack so that the cell stack is disposed therein, and a side surface of the horizontal partition wall and an inner surface of the frame may have a shape that is interlocked with each other to be fastened to each other.

[0013] The horizontal bulkhead may have an outer groove extending in a height direction formed on a side surface in contact with the frame, and the frame may include a frame protrusion on an inner surface in contact with the horizontal bulkhead that is configured to engage with the outer groove, and the outer groove and the frame protrusion may be fastened to each other by engaging with each other.

[0014] The horizontal bulkhead may include a fixing portion extending in an extension direction of the vertical bulkhead at an upper portion thereof, and the fixing portion may be fastened to the vertical bulkhead so that the horizontal bulkhead and the vertical bulkhead are fixed to each other.

[0015] The fixing portion may include a fixing horizontal portion extending in the extension direction of the vertical partition wall, and a fixing vertical portion extending in the height direction of the vertical partition wall from both sides of the fixing horizontal portion, and the vertical partition wall may be sandwiched so as to be fixed in a space formed by the fixing horizontal portion and the fixing vertical portion.

[0016] The battery module may further include end plates arranged on the front and rear surfaces of the cell stack so as to cover the front and rear surfaces of the cell stack, and the end plates may include a pair of center plates extending from one side facing the cell stack in a direction toward the cell stack and arranged side by side and spaced apart by the thickness of the vertical partition wall, and a portion of the vertical partition wall may be sandwiched between the center plates so that the end plates and the vertical partition wall are fixed to each other.

[0017] The cell stack may include an inner wall disposed between and separating a number of the cells.

[0018] The cell stack may further include a bus bar frame arranged perpendicular to the stacked cells, and the bus bar frame may include a pair of extension plates extending from one side in a direction toward the cells and arranged side by side and spaced apart by a thickness of the inner wall, and may be arranged such that a portion of the inner wall is sandwiched between the extension plates.

[0019] The vertical barrier rib may have vertical connection holes in which bus bars are disposed so that adjacent cell stacks are electrically connected to each other.

[0020] The horizontal partition wall may have horizontal connection holes in which bus bars are disposed so that adjacent cell stacks are electrically connected to each other.

[0021] The partition wall may be joined to the frame by welding a lower surface thereof that contacts the frame.

[0022] The battery module further includes a ceiling cover disposed on an upper portion of the cell stack,

[0023] The partition wall may be joined to the ceiling cover by welding at an upper surface thereof that contacts the ceiling cover. Effect of the Invention

[0024] The battery module according to the present invention includes a cell stack in which a plurality of cells are stacked, and partition walls disposed between adjacent cell stacks to separate the cell stacks from each other, the partition walls including a horizontal partition wall having a horizontal fastening space extending in a height direction and an inner groove extending in a height direction formed on an inner side forming the horizontal fastening space, and a vertical partition wall having a vertical fastening space disposed perpendicular to the horizontal partition wall and extending in the height direction, the vertical partition wall including a protrusion on a side in contact with the horizontal partition wall that is configured to engage with the inner groove, and the inner groove and the protrusion may be fastened to each other so that a portion of the vertical partition wall is sandwiched in the horizontal fastening space and a portion of the horizontal partition wall is sandwiched in the vertical fastening space, and the inner groove and the protrusion are fastened to each other so that they are fixed to each other by being engaged with each other.

[0025] As a result, a battery module can be provided in which the separation structure, which is easily fastened, delays the transfer of flames and high-temperature gases between the cells or cell stacks due to heat generated from within, thereby improving stability and improving structural rigidity to prevent deformation and collapse of the structure due to heat. [Brief description of the drawings]

[0026] [Figure 1] 1 is an exploded perspective view illustrating a battery module according to a first embodiment of the present invention; [Diagram 2] 1 is a perspective view illustrating a state in which a partition wall of a battery module according to a first embodiment of the present invention is arranged. [Diagram 3] 1 is a perspective view illustrating a partition wall of a battery module according to a first embodiment of the present invention. [Figure 4] 1 is a perspective view illustrating a horizontal partition wall of a battery module according to a first embodiment of the present invention. [Diagram 5] 1 is a perspective view illustrating a schematic vertical bulkhead of a battery module according to a first embodiment of the present invention; [Figure 6] 1 is a perspective view showing a frame of a battery module according to a first embodiment of the present invention; [Figure 7] FIG. 2 is a perspective view illustrating an end plate of the battery module according to the first embodiment of the present invention. [Figure 8] FIG. 11 is a perspective view illustrating a battery module according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and should not be construed as being limited to the following embodiments.

[0028] In order to clearly explain the present invention, detailed descriptions of parts that are not relevant to the description or of related known technologies that may obscure the gist of the present invention will be omitted, and when adding reference symbols to components in each drawing in this specification, the same or similar reference symbols will be used for the same or similar components throughout the specification.

[0029] Furthermore, the terms and words used in this specification and the claims should not be interpreted limited to their ordinary and dictionary meanings, but should be interpreted in a way that is consistent with the technical ideas of the present invention, based on the principle that the inventor himself / herself can appropriately define the concepts of terms in order to explain the invention in the best possible manner.

[0030] Example 1 The present invention provides a battery module as a first embodiment.

[0031] FIG. 1 is an exploded perspective view illustrating a battery module 10 according to a first embodiment of the present invention.

[0032] Referring to FIG. 1, a battery module 10 according to a first embodiment of the present invention may include a cell stack 100, a frame 200, an end plate 300, a ceiling cover 400, and a bulkhead 500.

[0033] The cell stack 100 of the battery module 10 may be formed by stacking a plurality of cells 110. The cell 110 may represent one secondary battery, and the cell 110 may be a pouch cell. Specifically, the cell stack 100 may be formed by stacking a plurality of cells 110 in parallel to each other.

[0034] The cell stack 100 may generate electrical energy for the battery module 10 .

[0035] The cell stack 100 may be disposed inside the frame 200 of the battery module 10. In this case, the frame 200 may be disposed to surround the lower surface and side surfaces of the cell stack 100. The frame 200 according to the first embodiment of the present invention may have a U-shape when viewed from the front.

[0036] A plurality of cell stacks 100 may be arranged inside the frame 200, and four cell stacks 100 may be arranged inside the frame 200 according to the first embodiment of the present invention. In this case, the cell stacks 100 may be arranged in two rows, two by two, inside the frame 200.

[0037] The frame 200 allows the cell stack 100 to be disposed inside the battery module 10 while maintaining its shape, and the frame 200 can protect the cell stack 100 from the outside.

[0038] The end plates 300 of the battery module 10 close the opening of the frame 200 in which the cell stack 100 is disposed, and may be disposed on the front and rear surfaces of the cell stack 100.

[0039] The end plates 300 may have a substantially rectangular parallelepiped plate shape, and may be formed in a pair to be disposed on the front and rear surfaces of the cell stack 100, respectively.

[0040] The end plates 300 can protect the cell stack 100 from the outside.

[0041] Although not shown in detail in the first embodiment of the present invention, the end plate 300 may be formed with a space in which additional components for electrically connecting the cell stack 100 to the outside can be arranged.

[0042] The ceiling cover 400 of the battery module 10 may be disposed on top of the cell stack 100.

[0043] The ceiling cover 400 may have a substantially rectangular parallelepiped plate shape, and may be formed so that the surface facing the cell stack 100 has approximately the same area as the lower surface of the frame 200.

[0044] The cell stack 100 can be protected from the outside by the ceiling cover 400.

[0045] FIG. 2 is a perspective view illustrating a state in which a partition wall 500 of a battery module 10 according to a first embodiment of the present invention is arranged, and FIG. 3 is a perspective view illustrating a partition wall 500 of a battery module 10 according to a first embodiment of the present invention.

[0046] As an example of a configuration for separating the cell stacks 100 from each other, the battery module 10 according to the first embodiment of the present invention may include a partition wall 500.

[0047] 2, the partition walls 500 are disposed between adjacent cell stacks 100 to separate the cell stacks 100 from each other. Since the partition walls 500 separate the cell stacks 100 from each other, the diffusion of heat and high-temperature gas generated from the cell stacks 100 during use of the battery module 10 to adjacent other cell stacks 100 can be delayed.

[0048] As an example of a configuration for efficiently isolating the cell stacks 100 from each other, the partition wall 500 of the battery module 10 according to the first embodiment of the present invention may include a horizontal partition wall 510 and a vertical partition wall 520.

[0049] 3, the horizontal partition walls 510 and the vertical partition walls 520 may each have a substantially rectangular parallelepiped plate shape. The horizontal partition walls 510 may be arranged parallel to the end plates 300, and the vertical partition walls 520 may be arranged perpendicular to the horizontal partition walls 510. Therefore, the four cell stacks 100 of the battery module 10 according to the first embodiment may be arranged in four regions divided by the horizontal partition walls 510 and the vertical partition walls 520, respectively.

[0050] FIG. 4 is a perspective view illustrating a horizontal bulkhead 510 of the battery module 10 according to the first embodiment of the present invention.

[0051] As an example of a configuration for efficient fastening with the vertical bulkhead 520, the horizontal bulkhead 510 of the bulkhead 500 according to the first embodiment of the present invention may be formed with a horizontal fastening space 511 and an inner groove 512.

[0052] Specifically, the horizontal fastening space 511 of the horizontal partition wall 510 may be arranged alongside the end plate 300 and formed extending in the height direction, and the inner groove 512 of the horizontal partition wall 510 may be formed extending in the height direction on the inner surface forming the horizontal fastening space 511.

[0053] 4, the horizontal fastening space 511 of the horizontal bulkhead 510 may be formed to extend a certain length from the lower portion to the upper portion, and the width of the horizontal fastening space 511 may be the same as the width of the vertical bulkhead 520. Therefore, a part of the vertical bulkhead 520 may be sandwiched in the horizontal fastening space 511, so that the horizontal bulkhead 510 and the vertical bulkhead 520 may be fastened to each other.

[0054] The inner groove 512 of the horizontal partition wall 510 may be formed on the inner surface of the horizontal partition wall 510 that defines the horizontal fastening space 511, and the inner groove 512 may cause the surface of the inner surface of the horizontal partition wall 510 to be bent.

[0055] The horizontal fastening spaces 511 and the inner grooves 512 of the horizontal bulkhead 510 may allow the horizontal bulkhead 510 to be efficiently fastened to the vertical bulkhead 520. The fastening method will be described later.

[0056] As an example of a configuration for fastening the horizontal bulkhead 510 and the frame 200, the horizontal bulkhead 510 according to the first embodiment of the present invention may have an outer groove 513 formed therein.

[0057] The outer groove 513 of the horizontal partition wall 510 may be formed on the side surface that contacts the frame 200 so as to extend in the height direction, and the outer groove 513 may cause the surface of the outer side surface of the horizontal partition wall 510 to be bent.

[0058] The outer surface of the horizontal bulkhead 510 and the frame 200 may be fastened together by engaging the outer groove 513 with the frame protrusion 210 described below.

[0059] As an example of a configuration for fastening the horizontal bulkhead 510 and the vertical bulkhead 520 , the horizontal bulkhead 510 according to the first embodiment of the present invention may include a fixing portion 514 .

[0060] The fixing portion 514 may be formed on the upper portion of the horizontal barrier rib 510 and extend in the extension direction of the vertical barrier rib 520. Specifically, the fixing portion 514 may include a fixing horizontal portion 514-1 and a fixing vertical portion 514-2.

[0061] The fixed horizontal portion 514-1 may be formed to extend from an upper portion of the horizontal barrier rib 510 in an extension direction of the vertical barrier rib 520. In this case, the upper portion of the horizontal barrier rib 510 connected to the fixed horizontal portion 514-1 may refer to a position corresponding to a portion where the horizontal barrier rib 510 and the vertical barrier rib 520 intersect with each other.

[0062] The fixed vertical portions 514-2 may be formed to extend from both sides of the fixed horizontal portion 514-1 in the height direction of the vertical partition wall 520. Specifically, the fixed vertical portions 514-2 may have a shape extending downward from both ends of the fixed horizontal portion 514-1.

[0063] Meanwhile, the fixed horizontal portion 514-1 and the fixed vertical portion 514-2 of the fixed portion 514 may all have a plate shape, and a space may be formed by the plate-shaped fixed horizontal portion 514-1 and the fixed vertical portion 514-2. In this case, the vertical partition wall 520 may be sandwiched in this space so that the horizontal partition wall 510 and the vertical partition wall 520 are fixed to each other. Also, the width of this space may be the same as the width of the vertical partition wall 520.

[0064] Therefore, a part of the vertical partition wall 520 may be sandwiched in the space formed by the fixed horizontal portion 514-1 and the fixed vertical portion 514-2, thereby fastening the horizontal partition wall 510 and the vertical partition wall 520 to each other.

[0065] When the horizontal bulkhead 510 and the vertical bulkhead 520 are fastened to each other by the fixing portion 514 of the horizontal bulkhead 510, structural rigidity and stability can be improved.

[0066] As an example of a configuration for electrical connection between the cell stacks 100, the horizontal partition wall 510 according to the first embodiment of the present invention may have a horizontal connection hole 515 formed therein.

[0067] A bus bar or the like may be disposed in the horizontal connection hole 515 so that adjacent cell stacks 100 are electrically connected to each other.

[0068] 4, the horizontal connection hole 515 may be formed to connect one side of the horizontal bulkhead 510 to the other side of the horizontal bulkhead 510. The shape of the horizontal connection hole 515 may vary depending on the shape of the busbars to be disposed.

[0069] A bus bar or the like may be disposed in the horizontal connection hole 515, and when the bus bar is disposed, the cell stacks 100 separated by the horizontal partition wall 510 may be electrically connected to each other.

[0070] FIG. 5 is a perspective view illustrating a schematic vertical bulkhead 520 of a battery module 10 according to the first embodiment of the present invention.

[0071] As an example of a configuration for efficient fastening with the horizontal bulkhead 510, the vertical bulkhead 520 of the bulkhead 500 according to the first embodiment of the present invention may be formed with a vertical fastening space 521 and a protrusion 522.

[0072] Specifically, the vertical fastening space 521 of the vertical partition wall 520 may be disposed perpendicular to the horizontal partition wall 510 and extend in the height direction, and the protrusion 522 of the vertical partition wall 520 may have a shape that engages with the inner groove 512 of the horizontal partition wall 510 on the side that contacts the horizontal partition wall 510.

[0073] 5, the vertical fastening space 521 of the vertical bulkhead 520 may be formed to extend a certain length from the upper portion to the lower portion of the vertical bulkhead 520, and the width of the vertical fastening space 521 may be the same as the width of the horizontal bulkhead 510. Therefore, the horizontal bulkhead 510 and the vertical bulkhead 520 may be fastened to each other by a part of the horizontal bulkhead 510 being sandwiched in the vertical fastening space 521. That is, the horizontal bulkhead 510 and the vertical bulkhead 520 may be fixed to each other by a part of the horizontal bulkhead 510 being sandwiched in the vertical fastening space 521.

[0074] The protrusions 522 of the vertical partition wall 520 may be formed on a side surface that contacts the horizontal partition wall 510 when the horizontal partition wall 510 and the vertical partition wall 520 are fastened together, and may be formed to engage with the inner grooves 512 of the horizontal partition wall 510. The protrusions 522 may cause the side surface of the vertical partition wall 520 to be bent.

[0075] Therefore, the inner surface of the horizontal partition wall 510 and the side surface of the vertical partition wall 520 may be fastened by being sandwiched such that the inner groove 512 and the protrusion 522 mesh with each other. That is, the horizontal partition wall 510 and the vertical partition wall 520 may be fixed to each other by sandwiching the protrusion 522 in the inner groove 512. With this fastening method, the horizontal partition wall 510 and the vertical partition wall 520 can be easily fastened and the cell stack 100 can be stably separated from each other.

[0076] As an example of a configuration for electrical connection between the cell stacks 100, the vertical barrier rib 520 according to the first embodiment of the present invention may have a vertical connection hole 523 formed therein.

[0077] In the vertical connection holes 523, a bus bar or the like may be disposed so that adjacent cell stacks 100 are electrically connected to each other.

[0078] 5, the vertical connection hole 523 may be formed to connect one surface of the vertical bulkhead 520 to the other surface of the vertical bulkhead 520. The shape of the vertical connection hole 523 may vary depending on the shape of the busbar to be disposed.

[0079] A bus bar or the like may be disposed in the vertical connection hole 523, and when the bus bar is disposed, the cell stacks 100 separated by the vertical partition wall 520 may be electrically connected to each other.

[0080] FIG. 6 is a perspective view that illustrates a frame 200 of a battery module 10 according to a first embodiment of the present invention.

[0081] Referring to FIG. 6, the frame 200 may include a frame protrusion 210 on a portion of the inner surface.

[0082] The frame protrusion 210 may be formed on an inner surface of the frame 200 that contacts the horizontal partition wall 510, and may have a shape that engages with an outer groove 513 of the horizontal partition wall 510. Therefore, the inner surface of the frame 200 that contacts the horizontal partition wall 510 due to the frame protrusion 210 may be formed to be bent.

[0083] The side of the horizontal bulkhead 510 and the inner surface of the frame 200 may be fastened together by engaging the outer groove 513 with the frame protrusion 210 through the frame protrusion 210. In this manner, the horizontal bulkhead 510 and the frame 200 may be fastened together efficiently.

[0084] FIG. 7 is a perspective view illustrating a schematic configuration of an end plate 300 of a battery module 10 according to a first embodiment of the present invention.

[0085] As an example of a configuration for fastening the vertical bulkhead 520 to the end plate 300 , the end plate 300 of the battery module 10 according to the first embodiment of the present invention may include a center plate 310 .

[0086] 7, the central plate 310 may have a substantially rectangular parallelepiped shape and may be formed in a pair. Also, the central plate 310 of the end plate 300 may extend in a direction toward the cell stack 100 from one side of the end plate 130 facing the cell stack 100, and may be arranged in a pair side by side and spaced apart by the thickness of the vertical partition wall 520.

[0087] In this case, a space may be formed between the central plates 310 arranged side by side and spaced apart from each other, and a portion of the vertical partition wall 520 may be disposed between the central plates 310, thereby fastening the vertical partition wall 520 to the end plate 300. That is, the vertical partition wall 520 may be sandwiched between the central plates 310, thereby fixing the end plate 300 and the vertical partition wall 520 to each other.

[0088] The central plate 310 may effectively fasten the longitudinal bulkheads 520 to the end plates 300 .

[0089] The bulkhead 500 of the battery module 10 according to the first embodiment of the present invention may be coupled to the frame 200 by welding at a lower surface in contact with the frame 200, and may be coupled to the ceiling cover 400 by welding at an upper surface in contact with the ceiling cover 400.

[0090] The partition wall 500 of the battery module 10 is joined to the frame 200 and the ceiling cover 400 by welding at their mutual contact surfaces, so that structural rigidity and stability can be improved.

[0091] The battery module 10 according to the first embodiment of the present invention has an easily fastened partition 500 that delays the transfer of flames and high-temperature gases between the cell stacks 100 due to heat generated from the inside, thereby improving stability and improving structural rigidity to prevent deformation and collapse of the structure due to heat.

[0092] Example 2 The present invention provides a battery module 20 of another form as a second embodiment.

[0093] Hereinafter, detailed description of the same configuration as the battery module 10 according to the first embodiment of the present invention will be omitted.

[0094] FIG. 8 is a perspective view illustrating a battery module 20 according to a second embodiment of the present invention.

[0095] As an example of a configuration for isolating the cells 110 from each other, the cell stack of the battery module 20 according to the second embodiment of the present invention may include an inner wall 120.

[0096] 8, the battery module 20 according to the second embodiment may include one cell stack. Here, one cell stack disposed inside the frame 200 may include inner walls 120 disposed between a certain number of cells 110, thereby isolating the certain number of cells 110 from each other.

[0097] Therefore, the cell stack of the battery module 20 may have a configuration in which a certain number of cells 110 and inner walls 120 are sequentially and repeatedly arranged side by side.

[0098] The cell stack of the battery module 20 according to the second embodiment of the present invention includes inner walls 120, which can reduce the effect of damage and fire caused by a certain number of cells 110 on other adjacent cells 110, and can delay the transfer of heat.

[0099] Although not shown in the second embodiment of the present invention, a certain number of cells 110 disposed between the inner walls 120 may be combined into one. In this case, since each cell 110 is separated by the inner wall 120, the inner wall 120 can delay the transfer of heat between each cell 110.

[0100] The cell stack of the battery module 20 according to the second embodiment of the present invention may further include a bus bar frame 130.

[0101] 8, the bus bar frame 130 may be disposed perpendicular to the cells 110 stacked on both sides to form the front and rear sides of the cell stack. That is, the bus bar frame 130 may be disposed side by side with the end plate 300.

[0102] The cells 110 may be electrically connected to each other by a bus bar frame 130 .

[0103] As an example of a configuration for fastening the inner wall 120 to the bus bar frame 130, the bus bar frame 130 according to the second embodiment of the present invention may include an extension plate.

[0104] The extension plate may have a substantially rectangular parallelepiped plate shape and may be formed in a pair. Also, the extension plate of the bus bar frame 130 may extend in a direction from one side of the bus bar frame 130 toward the cell stack, and may be arranged in a pair side by side and spaced apart from each other by the thickness of the inner wall 120.

[0105] In this case, a space may be formed between the extension plates arranged side by side and spaced apart from each other, and a portion of the inner wall 120 may be sandwiched between the extension plates, thereby fastening the inner wall 120 to the bus bar frame 130. Therefore, the number of extension plates may be increased as the number of inner walls 120 increases.

[0106] The extension plate may allow the inner wall 120 to be stably and efficiently fastened to the bus bar frame 130 .

[0107] Although not shown in the second embodiment of the present invention, the battery module may include a plurality of cell stacks including the inner wall 120 .

[0108] The battery module 20 according to the second embodiment of the present invention can prevent heat diffusion between the cells 110 constituting the cell stack in advance by delaying heat transfer between the cells 110 constituting the cell stack.

[0109] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the technical spirit of the present invention and the scope of the claims set forth below, by a person having ordinary knowledge in the technical field to which the present invention pertains. [Explanation of symbols]

[0110] 10, 20 Battery Module 100 Cell stack 110 Cell 120 Inner wall 130 Busbar frame 200 frames 210 Frame protrusion 300 End Plate 310 Center plate 400 Ceiling Cover 500 Bulkhead 510 Transverse bulkhead 511 Horizontal fastening space 512 Inner groove 513 Outer groove 514 Fixed part 514-1 Fixed horizontal section 514-2 Fixed vertical section 515 Horizontal connection hole 520 Longitudinal bulkhead 521 Vertical fastening space 522 Protrusion 523 Vertical connecting hole

Claims

1. A cell stack in which a plurality of cells are stacked; a partition wall disposed between adjacent cell stacks to separate the cell stacks from each other; The partition wall is A horizontal bulkhead in which a horizontal fastening space is formed extending in a height direction, and an inner groove is formed on an inner surface forming the horizontal fastening space, the inner surface being extended in the height direction; a vertical bulkhead disposed perpendicular to the horizontal bulkhead, having a vertical fastening space extending in a height direction, the vertical bulkhead including a protrusion on a side surface contacting the horizontal bulkhead, the protrusion being configured to engage with the inner groove, A portion of the vertical bulkhead is engaged with the horizontal fastening space, and a portion of the horizontal bulkhead is engaged with the vertical fastening space, The inner groove and the protrusion are fastened to each other so as to be engaged with each other and fixed.

2. The cell stack may further include a frame surrounding a lower surface and a side surface of the cell stack so that the cell stack may be disposed therein, The battery module according to claim 1 , wherein the side of the horizontal partition wall and the inner surface of the frame have shapes that are engaged with each other to be fastened to each other.

3. The transverse bulkhead is An outer groove is formed on the side surface that contacts the frame and extends in the height direction, The frame is a frame protrusion on an inner surface contacting the transverse bulkhead, the frame protrusion being configured to engage with the outer groove; The battery module according to claim 2 , wherein the outer groove and the frame protrusion are engaged with each other to be fastened.

4. The transverse bulkhead is A fixing portion is provided at an upper portion thereof and extends in an extension direction of the vertical bulkhead, The battery module according to claim 1 , wherein the fixing portion is fastened to the vertical bulkhead such that the horizontal bulkhead and the vertical bulkhead are fixed to each other.

5. The fixing portion is a fixed horizontal portion extending in an extension direction of the vertical bulkhead; a fixed vertical portion extending in a height direction of the vertical bulkhead from both sides of the fixed horizontal portion, The battery module according to claim 4 , wherein the vertical bulkhead is fixedly engaged in a space defined by the horizontal fixing portion and the vertical fixing portion.

6. The cell stack further includes end plates disposed on the front and rear surfaces of the cell stack such that the front and rear surfaces of the cell stack are covered, The end plate is a pair of center plates extending from one surface facing the cell stack in a direction toward the cell stack and spaced apart from each other by a thickness of the vertical partition wall; The battery module according to claim 1 , wherein a portion of the vertical bulkhead is sandwiched between the center plate so that the end plate and the vertical bulkhead are fixed to each other.

7. The cell stack is The battery module of claim 1 , further comprising an inner wall disposed between a certain number of the cells to separate the certain number of the cells from each other.

8. The cell stack is The stacked cells further include a bus bar frame disposed perpendicular to the stacked cells, The bus bar frame is A pair of extension plates extending from one surface in a direction toward the cell and spaced apart from each other by the thickness of the inner wall are disposed side by side, The battery module according to claim 7 , wherein a portion of the inner wall is disposed so as to be sandwiched between the extension plates.

9. The longitudinal bulkhead is The battery module according to claim 1 , wherein vertical connection holes are formed in which bus bars are disposed so that adjacent cell stacks are electrically connected to each other.

10. The transverse bulkhead is The battery module according to claim 1 , wherein a transverse connection hole is formed in which a bus bar is disposed so that adjacent cell stacks are electrically connected to each other.

11. The partition wall is The battery module according to claim 2 , wherein a lower surface in contact with the frame is joined to the frame by welding.

12. Further comprising a ceiling cover disposed on the upper portion of the cell stack; The partition wall is The battery module according to claim 1 , wherein an upper surface of the battery module in contact with the ceiling cover is connected to the ceiling cover by welding.

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