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 concerns about environmental pollution, the demand for environmentally friendly alternative energy sources has become an essential factor for future life. Accordingly, 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, with the increasing technological development and demand for battery-based electronic mobile devices and electric vehicles, the demand for batteries as an energy source is rapidly increasing, and a great deal of research is being conducted into batteries that can meet the resulting diverse demands.

[0005] Batteries that store electrical energy are generally classified as primary batteries and secondary batteries. While primary batteries are disposable, secondary batteries are rechargeable batteries manufactured using materials that allow for repeated oxidation and reduction processes between electric current and materials. That is, when a reduction reaction occurs in a material due to electric current, the power source is charged, and when an oxidation reaction occurs in the material, the power source is discharged. Electricity is generated through repeated charge-discharge cycles.

[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] As the battery module is used, heat is generated from the internal cells, and as a result, 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 gases.

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

[0009] To solve these problems, a battery module including a different type of separation structure is needed. 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 delays the transfer of flames and high-temperature gases between cells or cell stacks due to heat generated from inside, thereby improving stability and structural rigidity to prevent deformation and collapse of the structure due to heat. [Means for solving the problem]

[0011] A 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 the height direction formed on an inner surface forming the horizontal fastening space, and a vertical partition wall disposed perpendicular to the horizontal partition wall, having a vertical fastening space extending in the height direction and including a protrusion on a side surface 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 is 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 the side surface of the horizontal partition wall and the inner surface of the frame may have shapes that are interlocked with each other and fastened to each other.

[0013] The horizontal bulkhead may have an outer groove extending in a height direction formed on a side surface that contacts the frame, and the frame may include a frame protrusion that engages with the outer groove on an inner surface that contacts the horizontal bulkhead, and the outer groove and the frame protrusion may be engaged with each other to be fastened together.

[0014] The horizontal bulkhead may include a fixing portion at an upper portion thereof extending in an extension direction of the vertical bulkhead, 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 an extension direction of the vertical partition wall and a fixing vertical portion extending in a 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 disposed 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 inner walls disposed between a certain number of the cells and separating the certain number of the cells from each other.

[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 the thickness of the inner wall, and may be arranged so 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 an upper surface thereof that contacts the ceiling cover. [Effects of the Invention]

[0024] A 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 surface forming the horizontal fastening space, and a vertical partition wall disposed perpendicular to the horizontal partition wall, having a vertical fastening space extending in the height direction and including a protrusion on a side surface 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 are fixed by being engaged with each other.

[0025] As a result, the separation structure, which is easy to fasten, delays the transfer of flames and high-temperature gases between cells or cell stacks due to heat generated from inside, thereby improving stability and providing a battery module that can improve structural rigidity to prevent deformation and collapse of the structure due to heat. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is an exploded perspective view schematically illustrating a battery module according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view schematically illustrating a state in which a partition wall of a battery module according to a first embodiment of the present invention is arranged. [Figure 3] 1 is a perspective view schematically illustrating a partition wall of a battery module according to a first embodiment of the present invention. [Figure 4] 1 is a perspective view schematically illustrating a horizontal partition wall of a battery module according to a first embodiment of the present invention. [Figure 5] 1 is a perspective view schematically illustrating a vertical partition wall of a battery module according to a first embodiment of the present invention. [Figure 6] 1 is a perspective view schematically illustrating a frame of a battery module according to a first embodiment of the present invention. [Figure 7] 1 is a perspective view schematically illustrating an end plate of a battery module according to a first embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view schematically illustrating a battery module according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily understand the preferred embodiments of 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 explanation 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 throughout the specification for the same or similar components.

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

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

[0031] FIG. 1 is an exploded perspective view schematically 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 partition wall 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 with 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 bottom 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 placed 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 pairs so as 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 have 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 ceiling cover 400 can protect the cell stack 100 from the outside.

[0045] FIG. 2 is a perspective view schematically illustrating a state in which the partition wall 500 of the battery module 10 according to the first embodiment of the present invention is arranged, and FIG. 3 is a perspective view schematically illustrating the partition wall 500 of the battery module 10 according to the 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 one another. By separating the cell stacks 100 from one another using the partition walls 500, the diffusion of heat and high-temperature gas generated from the cell stacks 100 during use of the battery module 10 to adjacent cell stacks 100 can be delayed.

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

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

[0050] FIG. 4 is a perspective view schematically illustrating a horizontal partition wall 510 of a battery module 10 according to a 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 have a horizontal fastening space 511 and an inner groove 512 formed therein.

[0052] Specifically, the horizontal fastening space 511 of the horizontal bulkhead 510 may be arranged alongside the end plate 300 and formed extending in the height direction, and the inner groove 512 of the horizontal bulkhead 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 bottom to the top, and the width of the horizontal fastening space 511 may be the same as the width of the vertical bulkhead 520. Therefore, a portion of the vertical bulkhead 520 may be sandwiched in the horizontal fastening space 511, thereby fastening the horizontal bulkhead 510 and the vertical bulkhead 520 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 forms 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 grooves 513 of the horizontal partition walls 510 may be formed on the side surfaces that contact the frame 200 and extend in the height direction, and the outer grooves 513 may cause the surfaces of the outer surfaces of the horizontal partition walls 510 to bend.

[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 barrier rib 520. Specifically, the fixed vertical portions 514-2 may have a shape that extends downward from both ends of the fixed horizontal portion 514-1.

[0063] Meanwhile, the horizontal fixing portion 514-1 and the vertical fixing portion 514-2 of the fixing portion 514 may all have a plate shape, and a space may be formed between the horizontal fixing portion 514-1 and the vertical fixing portion 514-2. In this case, the vertical barrier rib 520 may be sandwiched in this space so that the horizontal barrier rib 510 and the vertical barrier rib 520 are fixed to each other. The width of this space may be the same as the width of the vertical barrier rib 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 together 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, a horizontal connection hole 515 may be formed in the horizontal partition wall 510 according to the first embodiment of the present invention.

[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 holes 515 may be formed to connect one side of the horizontal bulkhead 510 to the other side thereof. The shape of the horizontal connection holes 515 may vary depending on the shape of the bus bars to be arranged.

[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 schematically illustrating a vertical partition wall 520 of a battery module 10 according to a first embodiment of the present invention.

[0071] As an example of a configuration for efficient fastening with the horizontal partition wall 510, the vertical partition wall 520 of the partition wall 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 may 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 top to the bottom 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 portion 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 portion of the horizontal bulkhead 510 being sandwiched in the vertical fastening space 521.

[0074] The protrusions 522 of the vertical partition walls 520 may be formed on the side surfaces that contact the horizontal partition walls 510 when the horizontal partition walls 510 and the vertical partition walls 520 are fastened together, and may be formed to engage with the inner grooves 512 of the horizontal partition walls 510. The protrusions 522 may cause the side surfaces of the vertical partition walls 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 together by being sandwiched so that the inner groove 512 and the protrusion 522 engage with each other. That is, the horizontal partition wall 510 and the vertical partition wall 520 may be fixed together by sandwiching the protrusion 522 in the inner groove 512. This fastening method makes it easy to fasten the horizontal partition wall 510 and the vertical partition wall 520, and also enables the cell stack 100 to be stably separated from each other.

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

[0077] A bus bar or the like may be disposed in the vertical connection hole 523 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 side of the vertical bulkhead 520 to the other side thereof. The shape of the vertical connection hole 523 may vary depending on the shape of the bus bar 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 schematically illustrating 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 the inner surface of the frame 200 that contacts the horizontal bulkhead 510 and may have a shape that engages with the outer groove 513 of the horizontal bulkhead 510. Therefore, the inner surface of the frame 200 that contacts the horizontal bulkhead 510 due to the frame protrusion 210 may be formed to be bent.

[0083] The frame protrusion 210 may fasten the side of the horizontal bulkhead 510 to the inner surface of the frame 200 by engaging the outer groove 513 with 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 schematically illustrating 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. The central plate 310 of the end plate 300 may extend from one side of the end plate 130 facing the cell stack 100 toward the cell stack 100, and a pair of central plates 310 may be arranged 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 sandwiched 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 partition wall 500 of the battery module 10 according to the first embodiment of the present invention may be joined to the frame 200 by welding at its lower surface in contact with the frame 200, and may be joined to the ceiling cover 400 by welding at its upper surface in contact with the ceiling cover 400.

[0090] The partition wall 500 of the battery module 10 is joined by welding at the surfaces that come into contact with the frame 200 and the ceiling cover 400, thereby improving structural rigidity and stability.

[0091] The battery module 10 according to the first embodiment of the present invention has an easily fastened partition wall 500 that delays the transfer of flames and high-temperature gases between the cell stacks 100 due to heat generated from 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 another type of battery module 20 as a second embodiment.

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

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

[0095] As an example of a configuration for separating 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 an inner wall 120, which can reduce the impact of damage and fire generated from a certain number of cells 110 on other adjacent cells 110, and can delay heat transfer.

[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 heat transfer 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 surfaces of the cell stack. That is, the bus bar frame 130 may be disposed alongside the end plates 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 shape and may be formed in pairs. The extension plate of the bus bar frame 130 may extend from one side of the bus bar frame 130 in a direction toward the cell stack, and may be arranged in pairs 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 increase 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 each including an 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 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 skill in the art to which the present invention pertains. [Explanation of symbols]

[0110] 10, 20 Battery Module 100 cell stack 110 cells 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 extending in a height direction is formed and an inner groove extending in the height direction is formed on an inner surface forming the horizontal fastening space; 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 that is configured to engage with the inner groove, A portion of the longitudinal bulkhead is engaged with the transverse fastening space, and a portion of the transverse bulkhead is engaged with the longitudinal fastening space, The battery module, wherein the inner groove and the protrusion are fastened to each other so as to be engaged with each other and fixed.

2. a frame surrounding a lower surface and a side surface of the cell stack so that the cell stack is disposed therein; The battery module according to claim 1 , wherein the side surfaces of the horizontal partition walls and the inner surfaces of the frames are shaped to be engaged with each other.

3. The transverse bulkhead is An outer groove extending in a height direction is formed on the side surface that contacts the frame, The frame is a frame protrusion formed on an inner surface in contact with the transverse bulkhead and 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 fasten them together.

4. The transverse bulkhead is a fixing portion extending in an extension direction of the vertical partition wall at an upper portion thereof; The battery module according to claim 1 , wherein the fixing portion is fastened to the vertical bulkhead so 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; fixed vertical portions extending in a height direction of the vertical partition wall from both sides of the fixed horizontal portion, The battery module according to claim 4, wherein the vertical partition wall is fixedly engaged in a space defined by the horizontal fixing portion and the vertical fixing portion.

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

7. The cell stack is The battery module according to 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 cells and spaced apart by the thickness of the inner wall, 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 partition wall 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 horizontal connection holes are formed in which bus bars are 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 welded to the frame.

12. Further comprising a ceiling cover disposed on top of the cell stack; The partition wall is The battery module according to claim 1 , wherein an upper surface of the battery module that contacts the ceiling cover is welded to the ceiling cover.

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