Battery cell cover member and battery module comprising same

Abstract

The present invention relates to a battery cell cover member and a battery module including the same, the battery module comprising: a battery cell including a preset first battery cell, a second battery cell distinct from the first battery cell; a module frame that forms a battery cell accommodating portion, the battery cell accommodating portion being configured to accommodate the battery cells; and a battery cell cover member for forming a discharge part for discharging a fluid generated at the first battery cell from one side of the first battery cell in the vertical direction to the outside of the battery cell accommodating part.

Description

Technical Field

[0001] The present invention relates to a battery cell cover member and a battery module including the same, and more particularly, to a battery module capable of delaying thermal runaway. Background Art

[0002] Recently, as awareness of the crisis of environmental and resource depletion continues to increase, research and development of electric vehicles (Electric Vehicles) as environmentally friendly vehicles has received increasing attention. Electric vehicles include plug-in hybrid electric vehicles (PHEV), battery electric vehicles (BEV), fuel cell electric vehicles (FCEV), etc.

[0003] An electric vehicle may include a battery module and a battery housing supporting the battery module. On the other hand, an electric vehicle uses battery cells of the battery module as a power source, and when a fire occurs in the battery module, there is a risk of thermal runaway.

[0004] Therefore, there has recently been an urgent need for a battery module capable of reducing heat transfer in the battery module that causes thermal runaway when a fire occurs in the battery module of an electric vehicle. Summary of the invention

[0005] Embodiments of the present invention are intended to solve the above-mentioned problems and provide a battery module that can discharge high-temperature gas generated by a possible fire in a battery cell to the outside of the battery module.

[0006] The technical issues of the present invention are not limited to the above-mentioned technical issues. Those skilled in the art can further understand other technical issues that can be solved by the present invention based on the following content.

[0007] A battery module according to an embodiment of the present invention includes: a battery cell, the battery cell including a preset first battery cell and a second battery cell different from the first battery cell; a module frame, the module frame forming a battery cell accommodating portion, the battery cell accommodating portion being configured to accommodate the battery cell; and a battery cell cover member, the battery cell cover member being used to form a discharge portion, the discharge portion allowing the fluid generated at the first battery cell to be discharged from one side of the first battery cell in the up and down direction to the outside of the battery cell accommodating portion.

[0008] The battery cell cover member may include: a cover body configured to support the first battery cell; and a cover portion configured to cover one side of the first battery cell in the up-down direction and formed to be cut from the cover body under the action of the pressure of the fluid generated at the first battery cell.

[0009] The cover body may include a blocking portion disposed between the first battery cell and the second battery cell to separate the first battery cell from the second battery cell.

[0010] The battery cell cover member may further include a guide cutout portion extending along an outer circumference of the cover portion.

[0011] The battery cell cover member may include a first guide cutout portion disposed at the cover portion and extending in a first direction, and a second guide cutout portion extending in a second direction intersecting the first direction.

[0012] The battery cell cover member may include a guide cutout portion disposed at the cover body and extending along a length direction of the cover body.

[0013] The battery module of an embodiment of the present invention may further include: a fire-resistant cover component, which is arranged on one side of the battery cell cover component in the up and down direction and forms a guide portion, which allows the fluid generated at the battery cell to be discharged from one side of the battery cell cover component in the up and down direction to the outside of the battery cell accommodating portion.

[0014] The fire-resistant cover member may form the guide portion by cutting a fire-resistant cover portion which is arranged on one side in the up-down direction of the battery cell cover member and is formed to be cut under the pressure of the fluid generated in the battery cell.

[0015] The refractory cover member may further include a refractory guide cutout portion extending along a length direction of the refractory cover portion or along a circumferential direction of the refractory cover portion.

[0016] The guide portion may include a hole formed on the refractory cover member.

[0017] The thickness of the battery cell cover member in the up-down direction or the horizontal direction may be formed thinner than the thickness of the fire-resistant cover member in the up-down direction or the horizontal direction.

[0018] The battery cell may also include: a third battery cell, which is arranged on the opposite side of the first battery cell in the horizontal direction to the side where the second battery cell is located, and is covered by the cover body together with the first battery cell; the cover body may include: a first blocking portion, which is arranged between the first battery cell and the second battery cell; and a second blocking portion, which corresponds to the first blocking portion and covers the other side of the third battery cell opposite to the side facing the first battery cell.

[0019] A supporting member is disposed between the first battery cell and the third battery cell.

[0020] The supporting member is a surface pressure member or a refractory sheet.

[0021] The battery cell cover member may include: a first battery cell cover member, which is configured to support the first battery cell; and a second battery cell cover member, which is configured to support a second battery cell arranged on one side of the first battery cell in the horizontal direction and is arranged on one side of the first battery cell cover member in the horizontal direction; wherein a supporting member may be arranged between the first battery cell cover member and the second battery cell cover member.

[0022] The module frame may further include a first side frame and a second side frame disposed in parallel with each other to apply pressure to the battery cell in a horizontal direction at both sides of the battery cell in a horizontal direction.

[0023] The battery cell cover member may be disposed between the first side frame and the second side frame so as to cover an upper side of the first battery cell, and an upper side of the battery cell cover member may be open.

[0024] The battery cell may also include: a third battery cell, which is arranged on the opposite side of the first battery cell to the side of the second battery cell in the horizontal direction where the second battery cell is located, and the battery cell cover component may include: a blocking portion, which is arranged between the first battery cell and the third battery cell to separate the first battery cell from the third battery cell; and a battery cell opening portion, which is arranged to open a side of the first battery cell facing the second battery cell.

[0025] The cover body may further include a base portion connecting the first blocking portion and the second blocking portion and covering the other side of the first battery cell in the up-down direction.

[0026] The cover body may include: a first cover portion extending from the blocking portion to cover one side of the first battery cell in the up-down direction; and a second cover portion extending from the blocking portion to cover one side of the second battery cell in the up-down direction.

[0027] The battery module of the embodiment of the present invention may further include: a sensing plate disposed between the module frame and the battery cells; and a partition wall disposed between the module frame and the sensing plate.

[0028] The partition wall may be connected to the sensing board and extend from the sensing board toward the module frame.

[0029] The partition wall may be connected to the module frame and extend from the module frame toward the sensing plate.

[0030] A refractory mat or a refractory material may be disposed between the module frame and the battery cells.

[0031] The battery cell cover component of an embodiment of the present invention includes: a cover body, which is configured to support a preset first battery cell; and a cover portion, which is connected to the cover body and is separated from the cover body under the action of the fluid pressure to form a discharge portion for discharging the fluid to the outside of the cover body in order to prevent the fluid generated from the first battery cell from flowing to a second battery cell different from the first battery cell.

[0032] This technology can discharge high-temperature gases caused by a possible fire in the battery cell to the outside of the battery module, thereby preventing heat transfer to adjacent battery cells and preventing thermal runaway from occurring in the battery module.

[0033] The present technology is configured so that the battery cell cover member is cut open only when a fire occurs in the battery cell, and thus the gas within the battery module can be guided to the outside of the battery module more stably.

[0034] The present technology can prevent heat transfer to adjacent battery cells due to a possible fire in a battery cell, thereby preventing safety accidents.

[0035] In addition, the battery cell cover member of the present technology supports the first battery cell and the second battery cell while separating them, and thus can pressurize the battery cells while preventing heat transfer, thereby improving the efficiency of the battery cells.

[0036] Furthermore, various effects directly or indirectly achieved herein can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 FIG. 4 is a three-dimensional diagram of a battery module according to an embodiment of the present invention.

[0038] Figure 2 Based on Figure 1 The cross-sectional view of the battery module according to one embodiment of the present invention is obtained along line II'.

[0039] Figure 3 The present invention is a perspective view of a battery cell cover member covering a first battery cell and a third battery cell according to an embodiment of the present invention.

[0040] Figure 4 Based on Figure 3 The cross-sectional view of the battery cell cover member is taken along line II-II'.

[0041] Figure 5 FIG. 4 is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0042] Figure 6 FIG. 1 is a top view of a battery cell cover member according to an embodiment of the present invention.

[0043] Figure 7 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0044] Figure 8 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0045] Fig. 9 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0046] Fig.10 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0047] Fig.11 FIG. 4 is a cross-sectional view of a battery cell cover member according to an embodiment of the present invention.

[0048] Fig.12 FIG. 4 is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0049] Fig.13 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0050] Fig.14 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0051] Fig.15 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0052] Fig.16 FIG. 4 is a cross-sectional view of a battery module according to another embodiment of the present invention.

[0053] Fig.17This is a perspective view of a battery cell cover member according to another embodiment of the present invention.

[0054] Fig.18 for Fig.17 A cross-sectional view of a battery cell cover member according to yet another embodiment of the present invention is shown.

[0055] Fig.19 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0056] Fig. 20 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0057] Fig.21 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0058] Fig. 22 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0059] Fig.23 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0060] Fig.24 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0061] Fig.25 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0062] Fig.26 This is a perspective view of a battery cell cover member according to another embodiment of the present invention.

[0063] Fig. 27 for Fig.26 A top view of a battery cell cover member according to another embodiment of the present invention is shown.

[0064] Fig.28 for Fig.26 A cross-sectional view of a battery cell cover member according to yet another embodiment of the present invention is shown.

[0065] Fig.29 for Fig.26 A cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention is shown.

[0066] Fig.30 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0067] Fig.31 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0068] Fig.32FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0069] Fig.33 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0070] Fig.34 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0071] Fig.35 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0072] Fig.36 for Fig.35 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0073] Fig.37 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0074] Fig.38 for Fig.37 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0075] Fig.39 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0076] Fig.40 for Fig.39 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0077] Fig.41 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0078] Fig.42 for Fig.41 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0079] Fig.43 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0080] Fig.44 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0081] Fig.45 for Fig.44 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0082] Fig.46FIG. 1 is a schematic diagram of a battery module according to an embodiment of the present invention.

[0083] Fig.47 for Fig.46 A schematic diagram of the front end of a battery module is shown.

[0084] Fig.48 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0085] Fig.49 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0086] Fig.50 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0087] Fig.51 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0088] Fig.52 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0089] Fig.53 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0090] Fig.54 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0091] Fig.55 To show Fig.54 A schematic diagram of the combined structure of the refractory pad and the third side frame is shown.

[0092] Fig.56 To show Fig.54 A schematic diagram of another combination structure of the refractory pad and the third side frame is shown.

[0093] Fig.57 FIG. 4 is a three-dimensional diagram of a battery module according to another embodiment of the present invention.

[0094] Fig.58 for Fig.57 A cross-sectional view of a battery module is shown.

[0095] Fig.59 and Fig.60 The present invention is a schematic diagram showing a situation in which, when a fire occurs in a first battery cell of a battery module, a cover portion is separated from a cover body to prevent heat transfer from the battery cell to an adjacent second battery cell according to an embodiment of the present invention.

[0096] Fig.61 A schematic diagram of a battery pack system for preventing a flame generated by a first battery module from entering a second battery module according to an embodiment of the present invention.

[0097] Fig.62 A cross-sectional view of a battery pack system for preventing a flame generated by a first battery module from entering a second battery module according to an embodiment of the present invention.

[0098] Fig.63 A cross-sectional view of a battery pack system for preventing a flame generated by a first battery module from entering a second battery module according to another embodiment of the present invention.

[0099] Fig.64 FIG. 1 is a cross-sectional view of a battery cell cover member inserted into a gap filler according to an embodiment of the present invention.

[0100] Fig.65 FIG. 1 is a cross-sectional view of a battery cell cover member inserted into a gap filler according to another embodiment of the present invention.

[0101] Description of Reference Numerals

[0102] 1, 1-2, 1-3, 1-4, 1-5, 1-6, 1-7, 1-8, 1-9, 1a, 1b: Battery module 2: Base plate

[0103] 2a: Gap filler

[0104] 5. 10h, 630h, 830h: Insulation components

[0105] 10.310: Battery cell

[0106] 20: Module Framework

[0107] 20a: Battery cell receiving portion

[0108] 21: First side frame

[0109] 22: Second side frame

[0110] 23: Third side frame

[0111] 23a: Side frame body

[0112] 23b: Insert the protrusion

[0113] 24: Fourth side frame

[0114] 26: Sensor board

[0115] 27: Wire

[0116] 28: Side wall

[0117] 28a, 28a1, 28a2: First next door

[0118] 28b, 28b1, 28b2: Second next door

[0119] 29: Refractory pad

[0120] 30, 130, 230, 330, 430, 530, 630, 730, 830, 930: Battery cell cover member

[0121] 40, 240, 340, 440, 540, 640, 740, 840, 940: Cover body

[0122] 40a: Supporting part

[0123] 41: Battery cell opening

[0124] 42: Side battery unit opening

[0125] 45, 745: base

[0126] 50, 150, 350, 450, 550, 650, 750, 850, 950: blocking part

[0127] 60, 160: discharge part

[0128] 70, 170, 270, 370, 470, 570, 670, 770, 870, 970: Cover

[0129] 80, 180, 280, 680, 880: Guide cutout

[0130] 81a, 82a, 83a, 84a, 281a, 282a: guide incision part

[0131] 81b, 82b, 83b, 84b, 281b, 282b: guide connection part

[0132] 90: Refractory cover components

[0133] 91: Refractory cover

[0134] 92: Refractory support

[0135] 93: Refractory guide cutout

[0136] 95: Guidance Department

[0137] 180a: Separation tank

[0138] 180b: Guide separation part

[0139] 271: First cover

[0140] 272: Second opening and closing unit

[0141] 273: The third opening and closing part

[0142] 274: Fourth opening and closing unit

[0143] 281: First guide cutout

[0144] 282: Second guide cutout

[0145] 625: Cooling plate

[0146] 642: Side battery unit opening

[0147] 1000: Battery pack

[0148] 1000a: Module accommodating portion

[0149] 1000b: Bottom wall

[0150] 1001: Left outer wall

[0151] 1002: Right outer wall

[0152] 1003: Front outer wall

[0153] 1004: Rear outer wall

[0154] 1005: Front cross member

[0155] 1006: First cross member

[0156] 1007: Second cross member

[0157] 1008: Rear cross member

[0158] 1009: First longitudinal member

[0159] 1010: Second longitudinal member

[0160] 1011: The third longitudinal member

[0161] 1012: Intermediate components

[0162] 1020: Battery pack cover

[0163] FB: Clamping part

[0164] FR: Refractory

[0165] FS: Front Space

[0166] Fh: Refractory injection hole

[0167] RS: Rear space. DETAILED DESCRIPTION

[0168] The following describes in detail some embodiments of the present invention through exemplary drawings. It should be noted that when assigning reference numerals to the components of each figure, the same reference numerals are used as much as possible for the same components even if they are shown in different drawings. In addition, in describing the embodiments of the present invention, if it is determined that the specific description of the relevant known structure or function will hinder the understanding of the embodiments of the present invention, its detailed description will be omitted.

[0169] When describing the components of the embodiments of the present invention, the terms such as first, second, A, B, (a), (b) etc. may be used. Such terms are only used to distinguish the component from other components, and the nature, arrangement or order of the corresponding components are not limited by the terms. In addition, unless otherwise defined, all terms (including technical terms and scientific terms) used in this application should be understood to have the meanings commonly understood by those skilled in the art. Terms consistent with the content of commonly used dictionary definitions should be interpreted as having the same meaning in the context of the relevant technology, and should not be idealized or overly formalized unless the meaning is clearly indicated in this application.

[0170] Refer to the following Figures 1 to 65 , specifically describe the embodiments of the present invention.

[0171] Figure 1 FIG. 1 is a three-dimensional diagram of a battery module 1 according to an embodiment of the present invention. Figure 2 Based on Figure 1 The cross-sectional view of the battery module 1 according to one embodiment of the present invention is obtained along line II'. Figure 3 FIG. 1 is a perspective view of a battery cell cover member 30 covering the first battery cell 11 and the third battery cell 13 according to an embodiment of the present invention. Figure 4 Based on Figure 3 The cross-sectional view of the battery cell cover member is taken along line II-II'.

[0172] Reference Figures 1 to 4 The battery module 1 may be a structure for accommodating a plurality of battery cells 10 and covering the plurality of battery cells 10 from the outside. The battery module 1 may include a plurality of battery cells 10 and a module frame 20 forming a battery cell accommodating portion 20a formed in a manner that the plurality of battery cells 10 can be accommodated.

[0173] The plurality of battery cells 10 may extend along a first horizontal direction (X direction) and be arranged along a second horizontal direction (Y direction) perpendicular to the first direction. The battery cells 10 may be lithium-ion batteries, but are not limited thereto and may also be all-solid-state batteries. In the following, the first direction (X direction) and the second direction (Y direction) may refer to the first horizontal direction and the second horizontal direction, respectively.

[0174] The module frame 20 is configured to cover multiple battery cells 10 and may include: a first side frame 21, which is configured on the side of the multiple battery cells 10 in the direction opposite to the second direction (-Y direction); and a second side frame 22, which is configured on the side of the multiple battery cells 10 in the second direction (Y direction).

[0175] In addition, the module frame 20 may further include: a third side frame 23 disposed on the opposite direction (−X direction) of the first direction of the plurality of battery cells 10 ; and a fourth side frame 24 disposed on the first direction (X direction) side of the plurality of battery cells 10 .

[0176] The first side frame 21 and the second side frame 22 may be formed to correspond to each other and extend in parallel with each other. The third side frame 23 and the fourth side frame 24 may be formed to correspond to each other and extend in parallel with each other. The bottom plate 2 formed in a manner of covering the lower side of the battery cell 10 may be disposed on the lower side of the first to fourth side frames 21, 22, 23, 24.

[0177] The battery module 1 may include a battery cell cover member 30 formed in a manner to support at least one battery cell 10. The battery cell cover member 30 may cover the upper side of the at least one battery cell 10. The battery cell cover member 30 may extend in a first direction (X direction) in a manner to cover the upper side of the at least one battery cell 10, and may be configured in plurality and arranged in a second direction (Y direction).

[0178] In one embodiment of the present invention, the battery cell cover member 30 is different from the upper cover structure covering the upper side of the battery module 1 , and a plurality of battery cell cover members 30 may be configured and installed between the first side frame 21 and the second side frame 22 .

[0179] As described later, the battery cell cover member 30 can be understood as a structure for forming a discharge portion 60 that discharges the fluid (more specifically, high-temperature gas) generated in the battery cell 10 where a fire occurs from the upper side of the battery cell 10 to the outside of the battery cell accommodating portion 20a.

[0180] The battery cell 10 may include: a first battery cell 11; a second battery cell 12, which is arranged side by side with the first battery cell 11 and adjacent to the first battery cell 11; and a third battery cell 13, which is arranged on the opposite side of the second battery cell 12 relative to the first battery cell 11. Hereinafter, the first battery cell 11 or the third battery cell 13 may be understood as a battery cell where a fire occurs, and the second battery cell 12 may be understood as a battery cell for preventing heat transfer caused by a fire occurring in the first battery cell 11 or the third battery cell 13. The first battery cell 11 and the second battery cell 12 may be covered by different battery cell cover members 30, respectively. That is, the battery cell cover member 30 may include: a first battery cell cover member 31 arranged in a manner to cover the upper side of the first battery cell 11, and a second battery cell cover member 32 arranged in a manner to cover the upper side of the second battery cell 12.

[0181] like Figure 2 As shown, each battery cell cover member 30 can cover a pair of battery cells 10. In other words, the first battery cell cover member 31 can cover the first battery cell 11 and the third battery cell 13 arranged on the opposite side of the second battery cell 12 relative to the first battery cell 11, and the second battery cell cover member 32 can cover the second battery cell 12 and the fourth battery cell 14 arranged on the opposite side of the first battery cell 11 relative to the second battery cell 12. However, this is not limited to this, and each battery cell cover member 30 only needs to cover at least one battery cell 10.

[0182] The first battery cell cover member 31 may cover not only the upper side of the first battery cell 11 but also both sides in the horizontal direction of the first battery cell 11 and the third battery cell 13. Similarly, the second battery cell cover member 32 may cover not only the upper side of the second battery cell 12 but also both sides in the horizontal direction of the second battery cell 12 and the fourth battery cell 14.

[0183] To achieve such a structure, each of the first cell cover member 31 and the second cell cover member 32 may include a cover portion 70 disposed on one side of the battery cell 10 in the vertical direction and a blocking portion 50 covering one side of the battery cell 10 in the horizontal direction.

[0184] However, the Z direction shown in the above-mentioned figures or the following figures may be either the upper side or the lower side in the vertical direction. Therefore, the cover 70 may be arranged at the lower side of the battery cell 10 in the vertical direction, and the bottom plate 2 may be arranged at the upper side of the battery cell 10 in the vertical direction.

[0185] The cover portion 70 (which will be described in detail later) is a portion used to separate the battery cells 10 when a fire occurs. The blocking portion 50 can be a portion used to separate the first battery cell 11 from the second battery cell 12 while blocking heat conduction to prevent the battery cell 10 in which a fire occurs from transferring heat to the adjacent battery cell 10 and causing thermal runaway.

[0186] The structure of the battery cell cover member 30 will be described in detail below.

[0187] As described above, the battery cell cover member 30 can be configured to cover the pair of battery cells 11 and 13. The battery cell cover member 30 may include: a cover body 40 configured to support the first battery cell 11 and the third battery cell 13; and a cover portion 70 connected to the cover body 40 in a manner of closing the discharge portion 60, which is formed in a manner of opening in the event of a fire.

[0188] At this time, the cover body 40 may be understood as a structure other than the cover portion 70 in the battery cell cover member 30 .

[0189] The cover body 40 may include a blocking portion 50 having a first blocking portion 51 and a second blocking portion 52, wherein the first blocking portion 51 covers the side of the first battery cell 11 opposite to the second direction (Y direction); and the second blocking portion 52 covers the second direction (Y direction) side of the third battery cell 13. The first blocking portion 51 may be disposed between the first battery cell 11 and the second battery cell 12, and the second blocking portion 52 may correspond to the first blocking portion 51 and cover the third battery cell 13.

[0190] The blocking portion 50 can extend along the third direction (Z direction) so as to separate the first battery cell 11 and the third battery cell 13 from other battery cells 10, thereby delaying heat transfer to the battery cells arranged on the second direction (Y direction) side of the second battery cell 12 or the third battery cell 13 when a fire occurs in the first battery cell 11 or the third battery cell 13.

[0191] The third direction (Z direction) is a direction perpendicular to the first horizontal direction (X direction) and the second horizontal direction (Y direction), and can be understood as a side direction in the up-down direction. That is, the blocking portion 50 can extend in the up-down direction to isolate the battery cells 10 surrounded by each battery cell cover member 30. Therefore, the first blocking portion 51 can be disposed between the first battery cell 11 and the second battery cell 12 and extend in the up-down direction.

[0192] The cover portion 70 of the first battery cell cover member 30 can be configured in the following manner: in an environment where no fire occurs between the first battery cell 11 and the third battery cell 13, when the first battery cell 11 and the third battery cell 13 are operating normally, it is connected to the cover body 40 and covers the upper side of the first battery cell 11 and the third battery cell 13.

[0193] However, when a fire occurs in the first battery cell 11 or the third battery cell 13, the cover portion 70 of the first battery cell cover member 31 can be separated from the cover body 40 to open a portion of the upper side of the first battery cell 11 and the third battery cell 13. However, when the cover portion 70 is arranged on the lower side of the first battery cell cover member 30, the cover portion 70 of the first battery cell cover member 31 can be separated from the cover body 40 to open a portion of the lower side of the first battery cell 11 and the third battery cell 13.

[0194] When a fire occurs in the first battery cell 11 and the third battery cell 13, the internal pressure of the battery cell cover member 30 accommodating the first battery cell 11 and the third battery cell 13 rises, and the cover portion 70 may be separated from the cover body 40 due to such pressure. That is, the cover portion 70 may be formed in such a manner that it is cut and separated from the cover body 40 due to the high-temperature gas pressure generated at the first battery cell 11 or the third battery cell 13.

[0195] In other words, the cover portion 70 can be connected to the cover body 40, but in order to prevent the fluid generated at the first battery cell 11 or the third battery cell 13 from flowing to the second battery cell 12, it can be separated from the cover body 40 under the action of fluid pressure to form a discharge portion that allows the fluid generated at the first battery cell 11 or the third battery cell 13 to be discharged to the outside of the cover body 40.

[0196] Therefore, in order to ensure that the cover portion 70 is separated from the cover body 40 only when a fire occurs in the first battery cell 11 or the third battery cell 13, and is not separated when the first battery cell 11 or the third battery cell 13 is operating normally, the battery cell cover member 30 according to an embodiment of the present invention may include a guide cutout portion 80 extending along the outer circumference of the cover portion 70 (see FIG. Figure 3 ).

[0197] In addition, if Figure 4As shown, the blocking portion 50 and the cover portion 70 may be connected by the first guide connection portion 81b and the third guide connection portion 83b. At this time, the first guide cut portion 81a and the third guide cut portion 83a may be arranged between the blocking portion 50 and the cover portion 70, and the depth h2 of the first guide cut portion 81a and the third guide cut portion 83a along the third direction (Z direction) may be less than or equal to 50% of the thickness h1 of the battery cell cover member 30. However, this is not limited to this, for example, the thickness h1 of the battery cell cover member 30 may also be less than or equal to the depth h2 of the first guide cut portion 81a and the third guide cut portion 83a along the third direction (Z direction).

[0198] According to this structure, when a fire occurs in the first battery cell 11 or the third battery cell 13, the cover portion 70 is separated from the cover body 40 due to fluid pressure to form the discharge portion 60, so that the high-temperature gas generated by the fire can be guided to the outside of the battery cell receiving portion 20a. In addition, combined with the structure of the blocking portion 50, heat transfer from the first battery cell 11 to the second battery cell 12, etc. can be prevented, thereby avoiding thermal runaway of the battery module 1.

[0199] In addition, according to this structure, the first side frame 21 and the second side frame 22 arranged side by side with each other may apply pressure to the battery cell 10 in the horizontal direction on both sides of the battery cell 10 in the horizontal direction.

[0200] In addition, according to this structure, each battery cell cover member 30 is arranged between the first side frame 21 and the second side frame 22, and is arranged so that each battery cell cover member 30 covers the upper side of each battery cell 10. That is, a separate module cover may not be required, and thus the upper side of the battery cell cover member 30 can be provided in an open manner.

[0201] The above description is based on an embodiment of the present invention. The battery cell cover member 30 of this embodiment can be understood as being configured as follows: the cover portion 70 is separated from the cover body 40 while the guide connection portions 81 b , 82 b , 83 b , 84 b are cut.

[0202] Figure 5 FIG. 1 is a cross-sectional view of a battery cell cover member 130 according to another embodiment of the present invention.

[0203] The battery cell cover member 130 of another embodiment of the present invention is different from Figure 4 , the cover portion 170 may include a guide cutout portion 180 connected to the blocking portion 150 along an outer circumference thereof.

[0204] Different from Figure 4The cutout portion 180 may include: a guide separation portion 180b, which is thinner than the blocking portion 150 and is more easily cut due to the internal pressure of the battery cell cover member 130; and a separation groove 180a, which is formed by the guide separation portion 180b.

[0205] Figure 6 FIG. 1 is a top view of a battery cell cover member according to an embodiment of the present invention.

[0206] The guide cutout portion 80 may include guide cutout portions 81a, 82a, 83a, 84a extending along the outer circumference of the cover portion 70 and spacing the cover body 40 from the cover portion 70, and guide connection portions 81b, 82b, 83b, 84b connecting the cover portion 70 to the cover body 40.

[0207] The guide cutout portions 81 a , 82 a , 83 a , 84 a may include a first guide cutout portion 81 a , a second guide cutout portion 82 a , a third guide cutout portion 83 a , and a fourth guide cutout portion 84 a spaced apart from each other in the circumferential direction of the cover portion 70 .

[0208] The guide connection parts 81b, 82b, 83b, 84b may include: a first guide connection part 81b arranged between the first guide cut part 81a and the second guide cut part 82a, a second guide connection part 82b arranged between the second guide cut part 82a and the third guide cut part 83a, a third guide connection part 83b arranged between the third guide cut part 83a and the fourth guide cut part 84a, and a fourth guide connection part 84b arranged between the fourth guide cut part 84a and the first guide cut part 81a.

[0209] like Figure 6 As shown, the first to fourth guide cutouts 81a to 84a may be disposed at the four corners of the cover 70, but are not limited thereto. Similarly, the first to fourth guide connection portions 81b to 84b may be disposed at the centers of the four outer circumferential surfaces of the cover 70, but are not limited thereto.

[0210] During normal operation of the first battery cell 11 or the third battery cell 13 , the cover portion 70 can remain connected to the cover body 40 by guiding the connection portions 81 b , 82 b , 83 b , 84 b , thereby covering the upper side of the first battery cell 11 or the third battery cell 13 .

[0211] On the contrary, in the event of a fire in the first battery cell 11 or the third battery cell 13, the guide connection portions 81b, 82b, 83b, 84b are shorter in the peripheral direction of the cover portion 70 than the guide cutting portions 81a, 82a, 83a, 84a. Therefore, the guide connection portions 81b, 82b, 83b, 84b can be cut open under the pressure generated by the fire in the first battery cell 11 or the third battery cell 13.

[0212] The cover portion 70 may be configured in plurality and arranged in a manner spaced apart from each other along the first direction (X direction). Since the cover portion 70 is configured in this manner, the area of ​​the discharge portion 60 opened by the cover portion 70 being separated from the cover body 40 is formed differently according to the explosive force of a fire occurring at the battery cell 10 or the discharge amount of high-pressure gas, so that thermal runaway can be delayed more efficiently according to the situation.

[0213] On the other hand, the width d1 of the cover 70 in the second direction (Y direction) may be smaller than the length d2 of the cover 70 in the first direction (X direction). The width d3 of the first guide connection portion 81b and the third guide connection portion 83b in the outer circumferential direction of the cover 70 may be determined according to the length d2 of the cover 70. In addition, the width d4 of the second guide connection portion 82b and the fourth guide connection portion 84b in the outer circumferential direction of the cover 70 may be determined according to the width d1 of the cover 70.

[0214] The support portion 40a of the cover body 40 may be disposed between a pair of cover portions 70 adjacent to each other in the first direction (X direction). The length d5 ​​of the support portion 40a in the first direction (X direction) may be formed to be greater than 5 mm. With this structure, even if one cover portion 70 is separated from the cover body 40, the other adjacent cover portions 70 may be prevented from being separated therefrom.

[0215] Figure 7 FIG. 2 is a top view of a battery cell cover member 230 according to another embodiment of the present invention.

[0216] Reference Figure 7 , unlike the structure of an embodiment of the present invention, the battery cell cover member 230 may have a structure in which the cover portion 270 is cut into a plurality of parts and is cut from the cover body 240, rather than a structure in which the cover portion 270 is separated from the cover body 240.

[0217] The cover portion 270 is disposed on the battery cell 10 (see Figure 2 ) will not be cut during normal operation, thereby covering the upper side of the battery cell 10.

[0218] The cover portion 270 can be configured in the following manner: when a fire occurs in the battery cell 10 accommodated in the battery cell cover member 230, the cover portion 270 can be cut into multiple parts such as the first cover portion 271, the second cover portion 272, the third cover portion 273, and the fourth cover portion 274 due to the pressure of the high-pressure gas caused by the fire.

[0219] In other words, the battery cell cover member 230 may include a guide cutout portion 280 configured on the cover portion 270, the guide cutout portion 280 having: a first guide cutout portion 281, the first guide cutout portion 281 extending in a direction opposite to the second direction (Y direction) relative to the first direction (X direction); and a second guide cutout portion 282, the second guide cutout portion 282 extending in a second direction (Y direction) relative to the first direction (X direction) in a manner intersecting with the first guide cutout portion 281.

[0220] The first guide cutout portion 281 may extend in a direction opposite to the second direction (Y direction) relative to the first direction (X direction) and is configured to separate the first cover portion 271 from the fourth cover portion 274 and the second cover portion 272 from the third cover portion 273 .

[0221] The first guide cutout portion 281 may include: a plurality of guide cutout portions 281a, which are spaced apart from each other as they extend in a direction opposite to a second direction (Y direction) relative to the first direction (X direction); and a guide connection portion 281b, which is disposed between the plurality of guide cutout portions 281a.

[0222] The second guide cutout portion 282 may extend toward the second direction (Y direction) relative to the first direction (X direction), and is configured to space the first cover portion 271 from the second cover portion 272 and the third cover portion 273 from the fourth cover portion 274. The second guide cutout portion 282 may include: a plurality of guide cutout portions 282a extending toward the second direction (Y direction) relative to the first direction (X direction) and spaced from each other; and a guide connection portion 282b disposed between the plurality of guide cutout portions 282a.

[0223] according to Figure 7 , relative to the direction in which the guide cutout portions 281 and 282 extend, the cover portion 270 may be separated from each other into the first cover portion 271 to the fourth cover portion 274 to form an open portion.

[0224] The first length L1 of the guide cutout portion 280 in the second direction (Y direction) and the second length L2 in the first direction (X direction) are not limited, but the spacing distance L3 between the first guide cutout portion 281 and the second guide cutout portion 282 in the first direction (X direction) can be determined thereby.

[0225] Figure 8 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0226] Reference Figure 8 , the cover body 340 of the battery cell cover member 330 may have a structure in which the cover parts 371 , 372 are cut into the first cover part 371 and the second cover part 372 .

[0227] The battery cell cover member 330 may include a guide cutout portion 380 disposed on the cover body 340, the guide cutout portion 380 extending along a first direction (X direction) in the length direction of the cover body 340. In more detail, the battery cell cover member 330 may include: a guide cutout portion 380 provided at the center of the cover body 340 in the second direction (Y direction) and extending along the first direction (X direction).

[0228] The guide cutout portion 380 may include guide cutout portions 380 a spaced apart from each other along a straight line and a guide connection portion 380 b disposed between the plurality of first guide cutout portions 380 a .

[0229] Due to the fire, the guide cutout portion 380 is cut along the first direction (X direction) of the length direction of the cover body 340 , so that the first cover portion 371 and the second cover portion 372 can be separated from each other.

[0230] On the other hand, not only Figure 8 The guide cutout portion described below may also correspond to the above-mentioned structure consisting of the guide cutting portion and the guide connecting portion of the guide cutout portion.

[0231] Fig. 9 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0232] Reference Fig. 9 ,and Figure 8 Similarly, the battery cell cover member 430 may include a guide cutout portion 480 provided to the cover body 440 , the guide cutout portion 480 extending along a first direction (X direction) of the length direction of the cover body 440 .

[0233] The guide cutout portion 480 may be provided in plurality and spaced apart from each other along a second direction (Y direction) perpendicular to the first direction (X direction). The guide cutout portion 480 may include a first guide cutout portion 481 , a second guide cutout portion 482 , and a third guide cutout portion 483 .

[0234] The first to third guide cutout portions 481 to 483 may be spaced apart from each other at equal intervals along the second direction (Y direction), but are not limited thereto.

[0235] The cover 470 can be separated into the first to fourth cover parts 471, 472, 473, and 474 by the first to third guide cutouts 481 to 483. That is, in the case of a fire caused by the battery cell receiving portion 20a (refer to Figure 2 ) in an environment where the pressure is relatively strong, the second cover portion 472 and the third cover portion 473 can be separated from the cover body 440, and the first cover portion 471 and the fourth cover portion 474 can be deformed in a direction away from each other.

[0236] Therefore, the discharge portion 60 can be formed in the portion where the first to fourth cover portions 471, 472, 473, 474 were originally located (see Figure 4 ).

[0237] Fig.10 FIG. 1 is a top view of a battery cell cover member according to another embodiment of the present invention.

[0238] Reference Fig.10 The battery cell cover member 530 may include a guide cutout portion 580 provided on the battery cell cover body 540: a first guide cutout portion 581, the first guide cutout portion 581 extending in a first direction (X direction); a second guide cutout portion 582, the second guide cutout portion 582 extending from one end of the first guide cutout portion 581 in a second direction (Y direction) relative to the first direction (X direction); and a third guide cutout portion 583 extending from one end of the first guide cutout portion 581 in a direction opposite to the second direction (Y direction) relative to the first direction (X direction). The second guide cutout portion 582 and the third guide cutout portion 583 may intersect at one end of the first guide cutout portion 581.

[0239] The battery cell cover member 530 may further include: a fourth guide cutout portion 584 extending from the other end of the first guide cutout portion 581 in the opposite direction of the first direction (X direction) toward the second direction (Y direction); and a fifth guide cutout portion 585 extending from the other end of the first guide cutout portion 581 in the opposite direction of the first direction (X direction) toward the second direction (Y direction). The fourth guide cutout portion 584 and the fifth guide cutout portion 585 may intersect at the other end of the first guide cutout portion 581.

[0240] When a fire occurs in the battery cell receiving portion 20 a , the pressure increases and the cover portion 570 may be separated into the first to fourth cover portions 571 , 572 , 573 , and 574 to form the discharge portion 60 .

[0241] Fig.11 FIG. 4 is a cross-sectional view of a battery cell cover member according to an embodiment of the present invention.

[0242] Reference Fig.11 The battery cell cover member 30 may be configured as described above to cover both the first battery cell 11 and the third battery cell 13. In this case, it can be understood that the second battery cell 12 (see FIG. 1 ) is disposed on the side of the first battery cell 11 opposite to the third battery cell 13 in the horizontal direction. Figure 2 ).

[0243] In more detail, the battery cell cover member 30 may include a first blocking portion 51 covering one side of the first battery cell 11 , a second blocking portion 52 covering one side of the third battery cell 13 , and a cover portion 70 detachably connected from the first and second blocking portions 51 and 52 .

[0244] That is, the cover body 40, which is different from the cover portion 70, may include: a first blocking portion 51, which covers a side of the first battery cell 11 facing the second battery cell 12 in a manner that separates the first battery cell 11 from the second battery cell 12; and a second blocking portion 52, which corresponds to the first blocking portion 51 and covers a side of the third battery cell 13 facing the opposite side of the first battery cell 11.

[0245] According to this structure, even if a fire occurs in the first battery cell 11, heat can only be transferred from the first battery cell 11 to the third battery cell 13, and heat transfer to the adjacent second battery cell 12 and the like is delayed, thereby improving safety.

[0246] On the other hand, the battery cell cover member 30 may include a cell opening portion 41 disposed at the lower side of the first battery cell 11 and the third battery cell 13. The battery cell opening portion 41 may be formed by the lower end of the first blocking portion 51 and the lower end of the second blocking portion 52 being spaced apart from each other in the second direction (Y direction). In the structure in which the cover portion 70 is disposed at the lower side of the first battery cell 11 and the third battery cell 13, the battery cell opening portion 41 may be understood as a structure disposed at the upper side of the first battery cell 11 and the third battery cell 13.

[0247] At this time, the cell cover member 30 may be made of a material having heat insulation or fire resistance, such as MICA (mica), ceramic composite material, or aerosol composite material. As described later, the cell cover member 30 is not limited thereto and may also be formed of metal.

[0248] Although not shown in the drawings, according to this structure, the base 2 (see Figure 2 ) can be in direct contact with the first battery cell 11 and the third battery cell 13, thereby cooling the first battery cell 11 and the third battery cell 13 more efficiently.

[0249] Fig.12FIG. 4 is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0250] Reference Fig.12 , different from Fig.11 The battery cell cover member 30 - 1 can be arranged in a manner to cover one battery cell 10 - 1 .

[0251] The battery cell cover member 30-1 may include a first blocking portion 51-1 covering one side of the battery cell 10-1, a second blocking portion 52-1 covering the other side of the battery cell 10-1, and a cover portion 70-1 easily connected to and detached from the first and second blocking portions 51-1 and 52-1.

[0252] That is, the cover body 40-1 of the battery cell cover member 30-1 may include blocking portions 50-1 disposed on both sides of the first battery cell 10-1 in the horizontal direction. The blocking portion 50-1 may include: a first blocking portion 51-1 disposed between the first battery cell 10-1 and a second battery cell disposed on one side of the first battery cell 10-1 in the horizontal direction; and a second blocking portion 52-1 disposed between the first battery cell 10-1 and a third battery cell disposed on the other side of the first battery cell 10-1 in the horizontal direction corresponding to the first blocking portion 51-1.

[0253] According to this structure, even when a fire occurs in the first battery cell 10 - 1 , heat transfer to other adjacent battery cells can be delayed, thereby improving safety.

[0254] Likewise, the cell cover member 30-1 may include a cell opening portion 41-1 disposed on the lower side of the cell 10-1, which may enable more efficient cooling of the cell 310. As described above, the cell opening portion 41-1 may also be disposed on the upper side of the cell 10-1.

[0255] Fig.13 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0256] Reference Fig.13 The battery cell cover member 30-2 can be arranged in such a manner that it covers the first battery cell 11-2, the third battery cell 13-2 arranged on the opposite side of the second battery cell in the horizontal direction relative to the first battery cell 11-2, and the fifth battery cell 15-2. In this case, the third battery cell 13-2 can be arranged between the first battery cell 11-2 and the fifth battery cell 15-2.

[0257] The cover body 40-2 of the battery cell cover member 30-2 may be configured to simultaneously cover the first battery cell 11-2, the third battery cell 13-2, and the fifth battery cell 15-2, and may include blocking portions 50-2 disposed on both sides of the first, third, and fifth battery cells 11-2, 13-2, and 15-2 in the horizontal direction.

[0258] The battery cell cover member 30-2 may include: a first blocking portion 51-2, which covers a side of the first battery cell 11-2 facing the opposite direction of the third battery cell 13-2; a second blocking portion 52-2, which covers a side of the fifth battery cell 15-2 facing the opposite direction of the third battery cell 13-2; and a cover portion 70-2, which is easily connected to be separated from the first blocking portion 51-2 and the second blocking portion 52-2.

[0259] Similarly, the battery cell cover member 30-2 may include a battery cell opening portion 41-2 disposed on the lower side of the first battery cell 11-2, the third battery cell 13-2, and the fifth battery cell 15-2. According to this structure, the cooling efficiency of the battery cells 11-2, 13-2, and 15-2 can be further improved. In addition, the battery cell opening portion 41-2 can also be disposed on the upper side of the battery cells 11-2, 13-2, and 15-2.

[0260] Fig.14 FIG. 5 is a cross-sectional view of a battery cell cover member 530 according to another embodiment of the present invention.

[0261] Reference Fig.14 The battery cell cover member 30 - 3 can be arranged to cover a total of four battery cells, namely, the first battery cell 11 - 3 , the third battery cell 13 - 3 , the fifth battery cell 15 - 3 , and the seventh battery cell 17 - 3 .

[0262] The cover body 40 - 3 of the battery cell cover member 30 - 3 may include blocking portions 50 - 3 disposed on both sides of the four battery cells in the horizontal direction.

[0263] The battery cell cover member 30-3 may include: a first blocking portion 51-3, which covers a side of the first battery cell 11-3 facing the opposite direction of the third battery cell 13-3; a second blocking portion 52-3, which covers a side of the seventh battery cell 17-3 facing the opposite direction of the fifth battery cell 15-3; and a cover portion 70-3, which is easily connected to be separated from the first blocking portion 51-3 and the second blocking portion 52-3.

[0264] Further, the battery cell cover member 30-3 may define a battery cell opening portion 41-3, which is formed in a manner that the first blocking portion 51-3 and the second blocking portion 52-3 are open toward the lower side so that the four battery cells 511, 513, 515, 517 are in direct contact with the cooling portion (not shown in the figure). In addition, the battery cell opening portion 41-3 can be configured in a manner that the four battery cells 511, 513, 515, 517 are open toward the upper side.

[0265] Therefore, the cooling efficiency of the battery cells 511 , 513 , 515 , and 517 can be improved.

[0266] Reference Figures 11 to 14 The battery cell cover members 30, 30-1, 30-2, 30-3 may cover at least one battery cell 10 (refer to Figure 2 If it is expected that the flames caused by a fire that may occur in the battery cells 10 are relatively small, or the gas pressure generated by the fire is a relatively small value, the battery cell cover members 30, 30-1, 30-2, 30-3 can be configured to cover a relatively large number of battery cells 10.

[0267] This is because, although covering one battery cell 10 is highly effective in preventing heat transfer, generally, the space for accommodating the battery cells 10 is relatively limited, so it may be more ideal to prioritize increasing the density of the battery cells 10 .

[0268] Fig.15 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0269] Reference Fig.15 , the battery cell cover member 30-4 may cover the first battery cell 11-4 and the third battery cell 13-4 disposed on the opposite side of the first battery cell 11-4 from the second battery cell, and a support member 10h may be disposed between the first battery cell 11-4 and the third battery cell 13-4. The support member 10h may be a surface pressure member to apply a force toward each other to the first battery cell 11-4 and the third battery cell 13-4, or may be a fire-resistant sheet formed of a fire-resistant material to delay heat transfer between the first battery cell 11-4 and the third battery cell 13-4. Alternatively, the support member 10h may also be formed of silica gel or the like to simultaneously satisfy heat insulation and form surface pressure.

[0270] According to this structure, the battery cell cover member 30-4 is arranged in a manner to surround the plurality of battery cells 11-4, 13-4. Therefore, even if a fire occurs, the cover portion 70-4 is separated from the cover body 40-4, and the heat transfer that may occur between the battery cells 11-4, 13-4 in one battery cell cover member 30-4 can be more effectively delayed, thereby preventing the battery module 1 (see Figure 1 ) Thermal runaway occurs when a fire occurs.

[0271] Fig.16 FIG. 4 is a cross-sectional view of a battery module according to another embodiment of the present invention.

[0272] Different from Figure 2 The battery module 1 may further include a support member 5 between a first battery cell cover member 31 supporting the first battery cell 11 and a second battery cell cover member 32 supporting the second battery cell 12 and disposed on one side of the first battery cell cover member 31. The support member 5 may be a surface pressure member to apply forces toward each other to the first battery cell cover member 31 and the second battery cell cover member 32, or may be a fire-resistant sheet formed of a fire-resistant material to delay heat transfer between the first battery cell cover member 31 and the second battery cell cover member 32. Alternatively, the support member 5 may also be formed of silica gel or the like to simultaneously satisfy heat insulation and form surface pressure.

[0273] According to this structure, combined with the battery cell cover member 30, heat transfer from the first battery cell 11 to the second battery cell 12 due to a fire in the first battery cell 11 can be further prevented. In addition, the battery cell 10 needs to be pressurized on both sides in the second direction (Y direction), and this effect can be achieved by the support member 5.

[0274] Fig.17 This is a perspective view of a battery cell cover member according to another embodiment of the present invention. Fig.18 for Fig.17 A cross-sectional view of a battery cell cover member according to yet another embodiment of the present invention is shown. Fig.19 for Fig.17 A cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention is shown.

[0275] Reference Figures 17 to 19 The battery cell cover member 630 may be formed in an "L" shape. The battery cell cover member 630 may include: a cover portion 670 configured to cover one side of at least one battery cell 611, 613 in the up-down direction (e.g., the Z direction); and a blocking portion 650 connected to the cover portion 670 and extending in a direction opposite to the third direction (the Z direction) to cover one side of at least one battery cell 611, 613.

[0276] The second battery unit 612 may be disposed on one side of the first battery unit 611 in the horizontal direction, and the third battery unit 613 may be disposed on the other side of the first battery unit 611 in the horizontal direction.

[0277] At this time, the cover portion 670 can be configured in such a manner that it can be easily cut from the cover body 640 by the guide cutout portion 680 extending along the outer circumference of the cover portion 670. Therefore, when a fire occurs in the first battery cell 611 or the third battery cell 613, the cover portion 670 can be separated from the cover body 640 due to the pressure caused by the fire. The effects produced thereby are as described above.

[0278] The battery cell cover member 630 may include a battery cell opening portion 641, which is arranged on the other side of the first battery cell 611 and the third battery cell 613 in the up-down direction. At this time, if the cover portion 670 is arranged on the upper side of the first battery cell 611 and the third battery cell 613, the battery cell opening portion 641 may be arranged on the lower side of the first battery cell 611 and the third battery cell 613. In addition, if the cover portion 670 is arranged on the lower side of the first battery cell 611 and the third battery cell 613, the battery cell opening portion 641 may be arranged on the upper side of the first battery cell 611 and the third battery cell 613. The relevant effects are as described above.

[0279] The blocking portion 650 may cover one side of the first battery cell 611 and the third battery cell 613. The blocking portion 650 may extend to cover one side of the third battery cell 613 facing the opposite direction to the first battery cell 611.

[0280] In other words, the blocking portion 650 may be disposed between the first battery cell 611 and the second battery cell 612 to separate the first battery cell 611 from the second battery cell 612. However, unlike what is shown in the drawings, the blocking portion 650 may also extend to cover a side of the first battery cell 611 facing the opposite direction to the third battery cell 613.

[0281] On the other hand, a side cell opening portion 642 may be disposed on one side of the battery cell 611 not covered by the blocking portion 650. That is, the cell cover member 630 may be disposed with the side cell opening portion 642 so that one side of the first battery cell 611 facing the second battery cell 612 is open.

[0282] According to this structure, Fig.19 As shown, the first battery cell cover member 631 may cover the first battery cell 611 and the third battery cell 613 , and the second battery cell cover member 632 may cover the second battery cell 612 and the fourth battery cell 614 .

[0283] Even if a fire occurs in the first battery cell 611 or the third battery cell 613 inside the first battery cell cover member 631, the cover portion 670 of the first battery cell cover member 631 will be cut open, and high-pressure gas and the like will be directed to the upper side of the first battery cell cover member 631. In addition, due to the blocking portion 650 of the second battery cell cover member 632, heat transfer to the second battery cell 612 can be delayed, thereby preventing thermal runaway of the battery module 1.

[0284] As the battery cell cover member 630 is configured in an "L" shape, one side of the battery cells 611, 612, 613, 614 in the horizontal direction in the second direction (Y direction) may be opened, and a cooling plate 625 for cooling the battery cells 611, 612, 613, 614 may be further configured in this portion. That is, in the drawings, the cooling plate 625 may be provided on the side of the battery cells 611, 612, 613, 614 in the direction opposite to the second direction (Y direction).

[0285] In addition, a support member 630h may be disposed on the lower side of the battery cell cover member 630, and the support member 630h is disposed between the first battery cell 611 and the third battery cell 613. The support member 630h may be a surface pressure member to apply pressure to the first battery cell 611 and the third battery cell 613, or may be a fireproof sheet to thermally insulate the first battery cell 611 and the third battery cell 613. Alternatively, the support member 630h may be formed of silicone or the like to simultaneously satisfy the requirements of thermal insulation and surface pressure.

[0286] Fig. 20 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0287] Reference Fig. 20 , different from Fig.19 In the battery cell cover member 630 shown, the battery cell cover member 630-1 can be arranged in a manner to surround the individual battery cells 611-1, 612-1, 613-1, and 614-1.

[0288] The first battery cell cover member 631-1 may be configured to cover one side of the first battery cell 611-1 in the up-down direction and one side of the first battery cell 611-1 facing the third battery cell 613-1. The second battery cell cover member 632-1 may be configured to cover one side of the second battery cell 612-1 in the up-down direction and one side of the second battery cell 612-1 facing the first battery cell 611-1.

[0289] Fig.21 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0290] Reference Fig.21 The second battery cell 612-2 may be arranged on one side of the first battery cell 611-2, and the third battery cell 613-2 may be arranged on the other side of the first battery cell 611-2. The fourth battery cell 614-2 may be arranged on the opposite side of the second battery cell 612-2 from the first battery cell 611-2.

[0291] The battery cell cover member 630-2 may include: a first battery cell cover member 631-2, which covers one side of the first battery cell 611-2 in the up-down direction and a side of the first battery cell 611-2 facing the third battery cell 613-2; and a second battery cell cover member 632-2, which covers one side of the second battery cell 612-2 in the up-down direction and a side of the second battery cell 612-2 facing the first battery cell 611-2.

[0292] A support member 630h-2 may be disposed between the first battery cell cover member 631-2 and the second battery cell cover member 632-2. According to this structure, heat transfer from the first battery cell 611-2 to the second battery cell 612-2 or the third battery cell 613-2 may be delayed. At this time, the support member 630h-2 may be formed of a surface pressure member or a fireproof sheet as described above. Alternatively, the support member 630h-2 may be formed of a silica gel or the like that satisfies both heat insulation and surface pressure.

[0293] Fig. 22 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0294] Reference Fig. 22 , the battery cell cover member 630 - 3 may be configured to cover the individual battery cells 611 - 3 , 612 - 3 . Fig. 22 The battery cell cover member 630-3 and Fig. 20 Compared with the battery cell cover member 630 - 1 , the battery cell cover member 630 - 1 may further include a base 645 - 3 configured to cover the other side of the battery cells 611 - 3 and 612 - 3 in the up-down direction.

[0295] That is, each battery cell cover member 630-3 may include: a cover portion 670-3, which is configured to cover one side of the battery cells 611-3 and 612-3 in the up-down direction and can be cut open under the action of high-pressure gas; a cover body 640-3, which is connected to the cover portion 670-3. The cover body 640-3 may include: a blocking portion 650-3, which extends to the other side in the up-down direction to separate the battery cells 611-3 and 612-3; and a base portion 645-3, which extends from the blocking portion 650-3 and parallel to the cover portion 670-3.

[0296] At this time, the first battery cell cover member 631 - 3 and the second battery cell cover member 632 - 3 may have shapes corresponding to each other to respectively cover the adjacent battery cells 611 - 3 , 612 - 3 .

[0297] Fig.23 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0298] Reference Fig.23 , compared to Fig. 22 , the battery cell cover member 630 - 4 may have a structure in which the cover portion 670 - 4 extends from the blocking portion 650 - 4 in a direction opposite to a horizontal extension direction of the base portion 645 - 4 .

[0299] That is, the blocking portion 650-4 of the first battery cell cover member 631-4 may be disposed between the first battery cell 611-4 and the second battery cell 612-4, the cover portion 670-4 of the first battery cell cover member 631-4 may extend to cover one side of the first battery cell 611-4 in the vertical direction, and the base portion 645-4 of the first battery cell cover member 631-4 may extend to cover the other side of the second battery cell 612-4 in the vertical direction. The structure of the second battery cell cover member 632-4 may also correspond to the structure of the first battery cell cover member 631-4.

[0300] Fig.24 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0301] Reference Fig.24 The battery cell cover member 730 may be configured to cover the outer side of at least one battery cell 711, 713. That is, the battery cell cover member 730 may cover the outer periphery of one battery cell 711, 713, or may cover both the first battery cell 711 and the third battery cell 713, wherein the third battery cell 713 is arranged on the side of the first battery cell 711 opposite to the side in the horizontal direction where the second battery cell is arranged.

[0302] The cover body 740 of the battery cell cover member 730 may include: a first blocking portion 751, which covers the opposite side of the first battery cell 711 facing the third battery cell; and a second blocking portion 752, which covers the opposite side of the third battery cell 713 facing the first battery cell 711.

[0303] That is, the battery cell cover member 730 may include a blocking portion 750 covering both sides of the first and third battery cells 711 and 713 in a horizontal direction.

[0304] The battery cell cover member 730 may further include a cover portion 770, which is connected between the first blocking portion 751 and the second blocking portion 752 and is configured in a cuttable manner; and a base portion 745, which is arranged in parallel with the cover portion 770 and covers the other side of the first battery cell 711 and the third battery cell 713 in the up-down direction. The base portion 745 may connect the first blocking portion 751 and the second blocking portion 752 and cover the other side of the first battery cell 711 and the third battery cell 713 in the up-down direction.

[0305] Fig.25 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0306] Fig.25 The battery cell cover member 730-1 is compared to Fig.24 The battery cell cover member 730 has a base portion 745 - 1 formed with a battery cell opening portion 741 - 1 .

[0307] That is, the structures of the blocking portion 750-1 and the cover portion 770-1 in the battery cell cover member 730-1 are similar to those of the Fig.24 Correspondingly, the blocking portion 750-1 includes: a first blocking portion 751-1, which covers the opposite side of the first battery cell 711-1 facing the third battery cell 713-1; and a second blocking portion 752-1, which covers the opposite side of the third battery cell 713-1 facing the first battery cell 711-1.

[0308] However, the base 745 - 1 may form a battery cell opening portion 741 - 1 opened to the other side in the up-down direction at a portion faced by the first battery cell 711 - 1 and the third battery cell 713 - 1 , thereby improving the cooling effect.

[0309] Fig.26 This is a perspective view of a battery cell cover member according to another embodiment of the present invention. Fig. 27 for Fig.26 A top view of a battery cell cover member according to another embodiment of the present invention is shown. Fig.28 for Fig.26 A cross-sectional view of a battery cell cover member according to yet another embodiment of the present invention is shown. Fig.29 for Fig.26 A cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention is shown.

[0310] Reference Figure 26 to Figure 29 The battery cell cover member 830 may be formed in a "T" shape. The battery cell cover member 830 may include a blocking portion 850 disposed between the first battery cell 811 and the third battery cell 813, and a cover portion 870 extending from the blocking portion 850 to cover one side of the first battery cell 811 or the third battery cell 813 in the up-down direction.

[0311] The cover 870 is formed by Figure 3 The cover portion 70 shown is detachable from the cover body 840 by a guide cutout portion 880 extending along the outer circumference of the cover portion 870 .

[0312] The cover portion 870 may include: a first cover portion 870a, which extends from the blocking portion 850 toward the second direction (Y direction) in a manner that covers one side of the third battery cell 811 in the up-down direction; and a second cover portion 870b, which extends from the blocking portion 850 toward a direction opposite to the second direction (Y direction) in a manner that covers one side of the first battery cell 813 in the up-down direction.

[0313] When a fire occurs in the third battery cell 813, the first cover portion 870a may be separated from the cover body 840 to form a first discharge portion. When a fire occurs in the first battery cell 811, the second cover portion 870b may be separated from the cover body 840 to form a second discharge portion.

[0314] like Fig.29 As shown, from the perspective of the structure in which the plurality of battery cell cover members 830 are arranged, one side of the first battery cell 811 in the horizontal direction is open, so a support member 830h can be arranged between the first battery cell 811 and the second battery cell 812.

[0315] Similar to the support member 630h described above, the support member 830h may be a surface pressure member to apply pressure to the first battery cell 811 and the second battery cell 812, or may be a fire-resistant sheet to prevent heat transfer from the first battery cell 811 to the second battery cell 812. Alternatively, the support member 830h may be formed of silica gel or the like to simultaneously satisfy the requirements of heat insulation and surface pressure.

[0316] Fig.30 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0317] Reference Fig.30 The battery cell cover member 930 may be configured to cover the individual battery cells 911, 912, 913, 914. The battery cell cover member 930 may include a first battery cell cover member 931 and a second battery cell cover member 932 whose respective blocking portions 950 are in contact with each other.

[0318] The first battery cell cover member 931 may include: a cover body 940 having a blocking portion 950, which covers a side of the first battery cell 911 facing the second battery cell 912; and a first cover portion 971, which extends from the cover body 940 in a manner covering one side of the first battery cell 911 in the up and down directions.

[0319] In addition, the second battery cell cover member 932 includes: a cover body 940, wherein the cover body 940 has a blocking portion 950, which covers a side of the second battery cell 912 facing the first battery cell 911; and a second cover portion 972, which extends from the cover body 940 in a direction opposite to the first cover portion 971 in a manner covering one side of the second battery cell 912 in the up and down directions.

[0320] According to this structure, the blocking portions 950 of adjacent battery cell cover members 930 are in contact with each other, and the respective cover portions 971 and 972 can extend in opposite directions.

[0321] Fig.31 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0322] Reference Fig.31 ,exist Fig.30 On the basis of the structure of FIG. 1 , a support member 930h-1 may be disposed between the first battery cell cover member 931-1 and the second battery cell cover member 932-2 of the battery cell cover member 930-1.

[0323] That is, the support member 930h-1 may be disposed between the blocking portion 950 of the first cell cover member 931-1 and the blocking portion 950 of the second cell cover member 932-1, thereby increasing the surface pressure between the battery cells 911-1, 912-1, 913-1, and 914-1 or improving the heat insulation effect.

[0324] Fig.32 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention.

[0325] Reference Fig.32 , different from Fig.31The support member 930h-2 can be configured in a manner to prevent adjacent battery cells 911-2, 912-2, 913-2, and 914-2 from contacting each other.

[0326] In other words, the supporting member 930h-2 may be disposed between the first battery cell 911-2 and the third battery cell 913-2, and between the second battery cell 912-2 and the fourth battery cell 914-2.

[0327] According to this structure, it is also possible to maintain the surface pressure between the battery cells 911-2, 912-2, 913-2, and 914-2, or delay the heat transfer between the battery cells 911-2, 912-2, 913-2, and 914-2, and improve the cooling effect.

[0328] Fig.33 This is a cross-sectional view of a battery cell cover member according to another embodiment of the present invention.

[0329] Reference Fig.33 The battery cell cover member 930-3 may be formed in an "I" shape. The battery cell cover member 930-3 may include: a blocking portion 950-3 that separates the first battery cell 911-3 from the second battery cell 912-3; a first cover portion 970a-3 and a second cover portion 970b-3 that extend from one end of the blocking portion 950-3 in the up-down direction in opposite directions.

[0330] In addition, the battery cell cover member 930 - 3 may include a first base portion 945 a - 3 and a second base portion 945 b - 3 extending in opposite directions from the other end in the up-down direction of the blocking portion 950 - 3 .

[0331] According to this structure, the battery cell cover member 930 - 3 may include the structure of the blocking portion 950 - 3 , the cover portion 970 - 3 , and the base portion 945 - 3 in its entirety.

[0332] Fig.34 FIG. 4 is a cross-sectional view of a partial structure of a battery module according to another embodiment of the present invention. Fig.35 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0333] Reference Fig.34 and Fig.35 , different from Figure 2The battery module structure may further include: a fire-resistant cover component 90, which is arranged on one side of the multiple battery cell cover components 30 in the up and down direction, and forms a guide portion for discharging the fluid generated at the battery cell 10 from one side of the battery cell cover component 30 in the up and down direction to the battery cell accommodating portion 20a.

[0334] That is, in a structure in which the cover 70 is disposed on the upper side of the battery cell 10, the fire-resistant cover member 90 may be disposed on the upper side of the cover 70, and in a structure in which the cover 70 is disposed on the lower side of the battery cell 10, the fire-resistant cover member 90 may be disposed on the lower side of the cover 70. The following description will be based on the structure in which the cover 70 is disposed on the upper side of the battery cell 10, but the cover 70 and the fire-resistant cover member 90 may also be disposed on the lower side of the battery cell 10.

[0335] That is, when the fire-resistant cover member 90 formed of a fire-resistant material is disposed on the upper side of the battery cell cover member 30, and when a fire occurs in an adjacent battery cell 10 or an adjacent battery module, the fire-resistant cover member 90 can block foreign matter and the like propagating upward, thereby preventing the flame from spreading to the internal battery cell 10. At this time, the battery cell cover member 30 and the fire-resistant cover member 90 can be bonded to each other to fix the position.

[0336] However, when a fire occurs in the battery cell 10 supported by the battery cell cover member 30 , the cover portion 70 of the battery cell cover member 30 may be cut open to form the discharge portion 60 . In this case, the fire-resistant cover member 90 may be configured to form the guide portion 95 .

[0337] That is, the guide portion 95 may be an open portion that is disposed on one side of the battery cell cover member 30 in the vertical direction and allows the fluid generated at the battery cell 10 to be discharged from one side of the battery cell cover member 30 in the vertical direction to the outside of the battery cell receiving portion 20a. When the battery cell 10 is operating normally, the fire-resistant cover portion 91 is connected to the fire-resistant support portion 92 to protect the battery cell 10 and the battery cell cover member 30. When a fire occurs in the battery cell 10, the fire-resistant cover portion 91 can be cut from the fire-resistant support portion 92 along the fire-resistant guide cutout portion 93 together with the cover portion 70 to form the guide portion 95.

[0338] In this way, the fire-resistant cover portion 91 is arranged on one side of the battery cell 10 in the vertical direction and is formed in a manner to be cut open by the fluid pressure generated by the battery cell 10 . As the fire-resistant cover portion 91 is cut open, the guide portion 95 can be formed.

[0339] Fig.36 for Fig.35 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0340] like Fig.36 As shown, viewed from top view Fig.35 The refractory cover portion 91 may be connected to the refractory support portion 92. On the other side of the refractory cover portion 91 in the up-down direction, there may be a structure of a guide cutout portion 380-1 and a cover portion 370-1.

[0341] The guide cutout portion 380-1 may include a first guide cutout portion 381-1 and a second guide cutout portion 382-1 extending parallel to each other along the length direction of the cover portion 370-1, and the cover portion 370-1 may include first to third cover portions 371-1, 372-1, and 373-1 that can be separated by the first guide cutout portion 381-1 and the second guide cutout portion 382-1.

[0342] As at least one of the first to third cover parts 371-1, 372-1, 373-1 is cut, at least one of the first to third refractory cover parts 91a, 91b, 91c is cut, the refractory support part 92 and the uncut upper cover parts 91a, 91b, 91c can remain connected.

[0343] For example, the second cover portion 372-1 is separated from the first cover portion 371-1 and the third cover portion 373-1 along the first guide cutout portion 381-1 and the second guide cutout portion 382-1 to form a discharge portion, and at this position, the third fire-resistant cover portion 91c can be cut from the fire-resistant support portion 92 to form a guide portion. Thus, the discharge portion and the guide portion can be connected. According to this structure, when a fire occurs in the battery cell, high-temperature, high-pressure gas can be discharged to the outside of the battery cell accommodating portion more efficiently.

[0344] However, the shapes of the cover portion of the battery cell cover member and the cover portion of the fire-resistant cover member at this time are not limited thereto.

[0345] Fig.37 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention. Fig.38 for Fig.37 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0346] Reference Fig.37 and Fig.38 , a fire-resistant cover member 90 may be disposed on the upper side of the battery cell cover member 630 - 1 .

[0347] exist Fig.37 and Fig.38 In the structure of , the structure of the fire-resistant cover member 90 may correspond to the fire-resistant cover member 90 described above, but the structure of the battery cell cover member 630-1 is changed.

[0348] That is, the guide cutout 380-2 may not be located at the center of the cover 370-2 in the second direction (Y direction), but may be located to one side in the horizontal direction. The covers 91a, 91b, 91c of the refractory cover member 90 may be arranged to correspond to the guide cutout 380-2.

[0349] For example, the first cover portion 371-2 and the second cover portion 372-1 may be separated along the guide cutout portion 380-2 to form the discharge portion, and at this location, the third refractory cover portion 91c may be cut from the refractory support portion 92 to form the guide portion. Thus, the discharge portion and the guide portion may communicate.

[0350] Fig.39 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention. Fig.40 for Fig.39 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0351] Reference Fig.39 and Fig.40 , different from Fig.37 The refractory cover member 90 shown may not have the structure of the refractory support portion 92. Therefore, the refractory cover portions 91-1 may be connected by the guide cutout portion 93-1.

[0352] In addition, the battery cell cover member 830 may also be formed only by a cover portion 870 and a guide cutout portion 880, wherein the cover portion 870 includes a first cover portion to a third cover portion 871, 872, and 873, and the guide cutout portion 880 includes a first guide cutout portion 881 arranged between the first cover portion 871 and the second cover portion 872, and a second guide cutout portion 882 arranged between the second cover portion 872 and the third cover portion 873.

[0353] For example, when the third cover portion 873 is cut from the second cover portion 872 along the second guide cutout portion 882 to form the discharge portion, the first fire-resistant cover portion 91a-1 can be cut from the second fire-resistant cover portion 91b-1 along the fire-resistant guide cutout portion 93-1 to form the guide portion. In this case, the discharge portion and the guide portion can be arranged in a connected manner to discharge the battery cell accommodating portion 20a (see Fig.34 ) in high pressure gas.

[0354] Fig.41 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention. Fig.42 for Fig.41 A schematic diagram of a fire-resistant cover member and a battery cell cover member is shown.

[0355] Reference Fig.41 and Fig.42The refractory cover portion 91-2 of the refractory cover member 90-2 may be connected to the refractory support portion 92-2 via a refractory guide cutout portion 93-2 extending along the outer periphery of the refractory cover portion 91-2. However, although the refractory cover portion 91-2 is shown as an elliptical shape, it is not limited thereto.

[0356] The shape of the battery cell cover member 30 - 1 is also not limited, and the cover portion 70 - 1 may be connected to the cover body 40 - 1 via a guide cutout portion 80 - 1 extending along the outer periphery of the cover portion 70 - 1 of the battery cell cover member 30 - 1 .

[0357] However, when the cover portion 70-1 is cut along the guide cut portion 80-1 to form a discharge portion, the refractory cover portion 91-2, which is configured to be larger than the cover portion 70-1 so as to cover the cover portion 70-1, can be separated from the refractory support portion 92-2 along the refractory guide cut portion 93-2, thereby forming a guide portion 95 connected to the discharge portion.

[0358] Fig.43 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention.

[0359] Reference Fig.43 It can be confirmed that the structures of the refractory cover portion 91-2, the refractory support portion 92-2 and the refractory guide cutout portion 93-2 can be Fig.41 The structure in FIG. 1 corresponds to that in FIG. 1 , with only the structure of the battery cell cover member 630 - 1 being changed.

[0360] Fig.44 It is a schematic diagram of a fire-resistant cover member and a battery cell cover member of a battery module according to another embodiment of the present invention. Fig.45 for Fig.44 Schematic diagram of the fire-resistant cover component and the battery cell cover component.

[0361] Reference Fig.44 and Fig.45 , the refractory cover member 90-3 is different from the above structure, and can be formed only by the guide portion 95-3 without the structure of the refractory cover portions 91, 91-1, 91-2. That is, the guide portion 95-3 may include a hole formed on the refractory cover portion 90-3, rather than a structure formed by cutting the refractory cover portions 91, 91-1, 91-2 from the refractory support portions 92, 92-2.

[0362] At this time, when the cover 70-1 is cut along the guide cutout 80-1 to form a discharge portion, the discharge portion and the guide portion 95-3 are connected, so that the fluid can be discharged to the outside. However, at this time, another refractory material is also arranged on one side of the refractory cover member 90-3 in the up-down direction to prevent heat transfer caused by high-temperature gas or foreign matter generated by a fire in an adjacent portion.

[0363] On the other hand, the above Figure 35 to Figure 45 The fire-resistant cover member 90 - 3 described in is different from the battery cell cover members 30 , 130 , 230 , 330 , 430 , 530 , 630 , 830 , 930 , and may be formed of a fire-resistant material instead of metal.

[0364] On the other hand, the thickness of the battery cell cover member 30, 130, 230, 330, 430, 530, 630, 830, 930 in the vertical direction or the horizontal direction can be formed to be thinner than the thickness of the fire-resistant cover member 90-3 in the vertical direction or the horizontal direction. This is because the relatively thick design of the fire-resistant cover member 90-3 can effectively prevent the battery cell 10 (refer to Figure 2 ) is transferred from the outside of the battery cell 10, and at the same time, by forming the battery cell cover members 30, 130, 230, 330, 430, 530, 630, 830, 930 to be relatively thin, a higher energy density can be achieved under the condition of limited length of the battery cell 10 in the horizontal direction.

[0365] Fig.46 FIG. 1 is a schematic diagram of a battery module according to an embodiment of the present invention. Fig.47 for Fig.46 A schematic diagram of the front end of a battery module is shown.

[0366] Reference Fig.46 and Fig.47 The third side frame 23 may be arranged at the front end of the battery module 1, and the fourth side frame 24 may be arranged at the rear end of the battery module 1. In addition, the second side frame 22 and the first side frame 21 may be arranged on the second direction (Y direction) or the opposite direction side of the second direction (Y direction) of the battery module 1, respectively.

[0367] The first to fourth side frames 21 , 22 , 23 , and 24 may form a module frame, may accommodate a plurality of battery cells 10 therein, and may apply pressure to the plurality of battery cells 10 at the same time.

[0368] The second blocking portion 52 may be disposed on one side of the battery cell 10 facing the second direction (Y direction), and the first blocking portion 51 may be disposed on one side of the battery cell 10 facing the direction opposite to the second direction.

[0369] On the other hand, the rear end of the battery module 1 may be arranged on the first direction (X direction) side of the battery cell 10 , and the front end of the battery module 1 may be arranged on the opposite side of the battery cell 10 in the first direction (X direction).

[0370] In more detail, a front space FS may be disposed between the third side frame 23 and the battery unit 10, and a rear space RS may be disposed between the fourth side frame 24 and the battery unit 10. At this time, the sensor board 26 may be disposed in the front space FS and the rear space RS.

[0371] The sensing board 26 is used to control the battery unit 10 , and the front space FS can be divided into a first front space FS1 and a second front space FS2 by the sensing board 26 . In addition, the rear space RS can also be divided into a first rear space RS1 and a second rear space RS2 by the sensing board 26 .

[0372] The sensing plate 26 can be connected to the battery cell 10 via a wire 27. In this case, when a fire occurs in the battery cell 10, the heat transfer between adjacent battery cells 10 can be delayed due to the structure of the first blocking portion 51 and the second blocking portion 52. However, there is still a risk of foreign matter being transferred to the adjacent battery cell 10 through the front space FS and the rear space RS. Figures 48 to 52 ) for description.

[0373] Fig.48 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0374] Reference Fig.48 A side partition wall 28 may be disposed between the sensor plate 26 of the battery module 1 - 2 and the third side frame 23 .

[0375] In more detail, Fig.48 The partition wall 28a can be connected to the sensing plate 26 and extend from the sensing plate 26 toward the third side frame 23. At this time, the first partition wall 28a is disposed in the first front space FS1, which can delay the transfer of foreign matter or high-pressure gas from the battery cell 10 where the fire occurs to other battery cells 10 in the battery module 1-2 through the first front space FS1, thereby improving safety.

[0376] Fig.49 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0377] Reference Fig.49 A side partition wall 28 may be disposed between the sensor plate 26 of the battery module 1-3 and the third side frame 23. The partition wall 28b of the battery module 1-3 may be disposed in the first front space FS1. The partition wall 28b may be connected to the third side frame 23 and extend from the third side frame 23 toward the sensor plate 26.

[0378] Fig.50 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0379] Reference Fig.50 , a side partition wall 28 may be disposed between the sensing plate 26 of the battery module 1-4 and the third side frame 23. The side partition wall 28 of the battery module 1-4 may include a first partition wall 28a extending from the sensing plate 26 to the third side frame 23 and a second partition wall 28b extending from the third side frame 23 to the sensing plate 26. The first partition wall 28a and the second partition wall 28b may be alternately arranged along the second direction (Y direction).

[0380] Fig.51 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0381] Reference Fig.51 The side partition walls 28 of the battery module 1 - 5 may include a first partition wall 28 a extending from the sensing plate 26 toward the third side frame 23 and a second partition wall 28 b extending from the third side frame 23 toward the sensing plate 26 .

[0382] The second partition wall 28b may include a 2-1 partition wall 28b1 and a 2-2 partition wall 28b2 disposed opposite to each other across the first partition wall 28a. Thus, the side partition wall 28 of the battery module 1-5 may be formed in a structure in which the 2-1 partition wall 28b1, the first partition wall 28a, and the 2-2 partition wall 28b2 are alternately arranged in the second direction (Y direction).

[0383] Fig.52 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0384] Reference Fig.52 The side partition walls 28 of the battery modules 1 - 6 may include a first partition wall 28 a extending from the sensing plate 26 toward the third side frame 23 and a second partition wall 28 b extending from the third side frame 23 toward the sensing plate 26 .

[0385] The first partition wall 28a may include a 1-1 partition wall 28a1 and a 1-2 partition wall 28a2 disposed opposite to each other with the second partition wall 28b interposed therebetween. Thus, the side partition wall 28 of the battery module 1-6 may be formed in a structure in which the 1-1 partition wall 28a1, the second partition wall 28b, and the 1-2 partition wall 28a2 are alternately arranged in the second direction (Y direction).

[0386] Fig.53 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention.

[0387] Reference Fig.53 The battery module 1-7 may include a refractory material FR disposed between the third side frame 23 and the battery unit 10. The refractory material FR may be injected into the front space FS of the battery module 1-7. A refractory material injection hole Fh may be formed on the third side frame 23 so as to inject the refractory material FR into the first front space FS1 and the second front space FS2.

[0388] After the refractory material FR is injected through the injection hole Fh, the injection hole Fh can be closed. As the refractory material FR is injected into the front space FS, even if a fire occurs in the battery cell 10, the heat transfer to the adjacent battery cell 10 can be delayed by the blocking parts 51 and 52, and the flame propagation through the front space FS can be delayed by the refractory material FR. As a result, the safety of the battery modules 1-7 can be improved.

[0389] Fig.54 FIG. 4 is a schematic diagram of a front end portion of a battery module according to another embodiment of the present invention. Fig.55 To show Fig.54 A schematic diagram of the combined structure of the refractory pad and the third side frame is shown.

[0390] Reference Fig.54 and Fig.55 The battery module 1 - 8 may include a refractory pad 29 disposed between the third side frame 23 and the battery unit 10 .

[0391] In more detail, the refractory mat 29 may be attached to an inner side surface of the third side frame 23 facing the battery unit 10 and accommodated in the first front space FS1 .

[0392] The propagation of fire through the front space FS of the battery cell 10 may be delayed by the fire-resistant mat 29 .

[0393] On the other hand, the third side frame 23 may include a side frame body 23 a and an insertion protrusion 23 b protruding from the side frame body 23 a toward the first direction (X direction) of the battery cell 10 .

[0394] The fireproof mat 29 may include an insertion hole 29b formed on the mat body 29a and configured to be inserted into the insertion protrusion 23b. As the insertion protrusion 23b is inserted into the insertion hole 29b, the fireproof mat 29 may be coupled to the third side frame 23 to fix the position.

[0395] Fig.56 To show Fig.54 A schematic diagram of another combination structure of a refractory pad and a third side frame is shown.

[0396] Reference Fig.56 The fireproof pad 29-1 is combined with the third side frame 23-1 by using a structure that can be inserted into the third side frame 23-1. The third side frame 23-1 may include a side frame body 23a-1, a first hanging portion 23b-1 and a second hanging portion 23b-2, the first hanging portion 23b-1 and the second hanging portion 23b-2 extending from the side frame body 23a-1 toward the battery unit 10 (refer to Fig.54 ) in a first direction (X direction) and protrude toward each other in the up-down direction.

[0397] The first hanging part 23b-1 and the second hanging part 23b-2 may protrude from the upper end and the lower end of the side frame body 23a-1 in the direction toward the battery cell 10 and bend toward each other. At this time, the refractory mat 29-1 may be inserted through one side of the first hanging part 23b-1 and the second hanging part 23b-2, and the first hanging part 23b-1 and the second hanging part 23b-2 may apply pressure to the refractory mat 29-1 in the opposite direction of the first direction (X direction) to fix the position of the refractory mat 29-1.

[0398] On the other hand, as described above, the structure in the front space FS may be formed correspondingly in the rear space RS of the battery modules 1, 1-2, 1-3, 1-4, 1-5, 1-6, 1-7, and 1-8.

[0399] Fig.57 FIG. 4 is a three-dimensional diagram of a battery module according to another embodiment of the present invention. Fig.58 for Fig.57 A cross-sectional view of a battery module is shown.

[0400] Reference Fig.57 and Fig.58 , battery modules 1-9 are different from Figure 1 The battery module 1 shown may further include a clamping portion FB. The clamping portion FB may be formed by a fixing band and may be configured to cause the first side frame 21 and the second side frame 22 of the battery module 1-9 to be subjected to force in directions toward each other.

[0401] According to this structure, the clamping part FB can be respectively arranged on the upper side of the battery cell cover member 30 and the lower side of the bottom plate 2. Due to the arrangement of the clamping part FB, even without an additional battery module upper cover, the plurality of battery cells 10 arranged in the second direction (Y direction) can be prevented from moving away from each other. That is, even if the battery cell 10 swells (Swelling), the pressure applied by the clamping part FB can prevent the performance of the battery cell 10 from being degraded.

[0402] Fig.59 and Fig.60 The present invention is a schematic diagram showing a situation in which, when a fire occurs in a first battery cell of a battery module 1 , the cover portion 70 is separated from the cover body 40 to prevent heat transfer to a second battery cell adjacent to the battery cell according to an embodiment of the present invention.

[0403] Reference Figure 2 , Fig.59 and Fig.60 Before a fire occurs in the first battery cell 11 , the cover portion 70 may be connected to the cover body 40 and cover one side of the first battery cell 11 in the up-down direction.

[0404] When a fire occurs in the first battery cell 11 , the guide connection portions 81 b , 82 b , 83 b , 84 b are cut open by the high-pressure gas pressure or flames, and the cover portion 70 is separated from the cover body 40 and the battery module 1 .

[0405] As the cover 70 is separated from the cover body 40, the fluid generated in the first battery cell 11 can be guided to one side in the vertical direction of the first battery cell 11 under the action of pressure. According to this structure, the fluid generated in the first battery cell 11 can be prevented from flowing to the adjacent second battery cell 12.

[0406] In addition, due to the arrangement of the blocking portion 50 of the battery cell cover member 30 , heat transfer from the relatively high temperature first battery cell 11 to the second battery cell 12 can be prevented.

[0407] Therefore, the battery module 1 can prevent thermal runaway caused by heat transfer between adjacent battery cells 10, thereby preventing user safety accidents. In addition, by applying pressure to the battery cell 10, the efficiency of the battery cell 10 can also be prevented from decreasing.

[0408] Fig.61 Schematic diagram of a battery pack system 1000 for preventing a flame generated in a first battery module 1a from entering into a second battery module 1b according to an embodiment of the present invention. Fig.62 A cross-sectional view of a battery pack system for preventing a flame generated at a first battery module from entering a second battery module according to an embodiment of the present invention.

[0409] Reference Fig.61 and Fig.62 The battery pack system 1000 may include a left outer wall 1001, a right outer wall 1002, a front outer wall 1003, and a rear outer wall 1004 for accommodating a plurality of battery modules 1a and 1b. The battery pack system 1000 may also include a bottom wall 1000b to support the battery modules 1a and 1b.

[0410] A module accommodating portion 1000 a may be formed between the left outer wall 1001 , the right outer wall 1002 , the front outer wall 1003 , and the rear outer wall 1004 to accommodate a plurality of battery modules 1 a , 1 b .

[0411] In addition, the plurality of battery modules 1 a and 1 b may be spaced apart and respectively accommodated in the first direction (X direction) by the front cross member 1005 , the rear cross member 1008 , and the first cross member 1006 and the second cross member 1007 .

[0412] Likewise, the plurality of battery modules 1 a and 1 b may be spaced apart along the second direction (Y direction) and accommodated separately by the first vertical member 1009 , the second vertical member 1010 , and the third vertical member 1011 .

[0413] The battery pack system 1000 may include a battery pack cover 1020 covering the upper sides of the battery modules 1a and 1b. When a fire occurs in the first battery module 1a, foreign matter moving to the upper side of the first battery module 1a is blocked by the battery pack cover 1020 in the battery pack system 1000 to prevent it from leaking out, thereby improving safety.

[0414] At the same time, each battery module 1a, 1b is protected from thermal runaway by the battery cell cover member 30 as described above, and foreign matter or high-pressure gas generated by flames or the like can be prevented from flowing from the first battery module 1a where a fire occurs to the second battery module 1b, thereby more efficiently preventing thermal runaway. Therefore, even if a fire occurs in the first battery module 1a, thermal runaway of the battery pack system 1000 can be prevented, thereby preventing safety accidents of users and improving the durability of other battery modules 1b.

[0415] However, the present invention is not limited to the embodiment shown in the drawings. Figure 2 ) can be disposed toward the bottom wall 1000b, and the bottom plate 2 can be disposed toward the battery pack cover 1020. At this time, the battery modules 1a and 1b can be supported by being combined with the bottom wall 1000b through the module frames 21, 22, 23, and 24.

[0416] Fig.63 A cross-sectional view of a battery pack system for preventing a flame generated by a first battery module from entering a second battery module according to another embodiment of the present invention.

[0417] Reference Fig.63 , different from Fig.62 The battery pack system 1000-1 may further include an intermediate member 1012 disposed between the third longitudinal member 1011 and the battery pack cover 1020, wherein the third longitudinal member 1011 is disposed on the upper side of the bottom wall 1000b-2.

[0418] Through this structure, when a fire occurs in the first battery module 1a, heat transfer from the first battery cell 11 to other adjacent second battery cells 12 can be delayed, and the high-pressure gas discharged to the upper side will not be discharged to the outside of the battery pack system 1000-1 due to the battery pack cover 1020.

[0419] Furthermore, foreign matter or high-pressure gas that moves upward from the first battery module 1a and collides with the battery pack cover 1020 can be prevented from flowing toward the second battery module 1b, thereby delaying the spread of fire to the second battery module 1b and improving safety.

[0420] At this time, the cover 70 (see Figure 2) can also be configured toward the bottom wall 1000b, and the bottom plate 2 can also be configured toward the battery pack cover 1020.

[0421] Fig.64 FIG. 1 is a cross-sectional view of a battery cell cover member inserted into a gap filler according to an embodiment of the present invention.

[0422] Reference Fig.64 The battery cell cover member 30-4 may be formed of a metal having high fire resistance. The structure of the battery cell cover member 30-4 is not limited, and the shape of the battery cell cover member in this specification may be adopted and formed of metal. However, in the case of being formed of metal, the shape of the cover portion may be configured to be relatively small.

[0423] If the battery cell cover member 30-4 is formed of metal, the cooling effect of the battery cell 10 can be improved. In addition, a cooling liquid channel (not shown in the figure) can be configured on the bottom plate 2. At this time, a gap filler 2a can be configured between the bottom plate 2 and the battery cell 10, and the battery cell cover member 30-4 can be connected to the gap filler 2a to further improve the cooling effect of the battery cell 10.

[0424] Fig.65 FIG. 1 is a cross-sectional view of a battery cell cover member inserted into a gap filler according to another embodiment of the present invention.

[0425] Reference Fig.65 The base 45-4 of the battery cell cover member 70-5 can be formed in a curved structure so that the length of the battery cell cover member 70-5 inserted into the gap filler 2a is relatively long. Thus, the contact area between the battery cell cover member 70-5 and the gap filler 2a can be increased, thereby improving the cooling effect of the battery cell 10.

[0426] However, the structure of the battery cell cover member 70 - 5 is not limited thereto.

[0427] The above description is merely an exemplary description of the technical concept of the present invention, and a person skilled in the art may make various modifications and variations without departing from the essential characteristics of the present invention.

[0428] Therefore, the embodiments disclosed in the present invention are intended to illustrate the technical ideas rather than to limit them, and any interpretation based on these embodiments should not limit the scope of the technical ideas of the present invention. The protection scope of the present invention should be interpreted according to the claims, and all technical ideas within their equivalent scope should be interpreted as being included in the scope of rights of the present invention.

Claims

1. A battery module, comprising: A battery cell, wherein the battery cell comprises a preset first battery cell and a second battery cell different from the first battery cell; a module frame, the module frame forming a battery cell receiving portion, the battery cell receiving portion being configured to receive the battery cell; as well as A battery cell cover member is configured to form a discharge portion that discharges a fluid generated at the first battery cell from one side in a vertical direction of the first battery cell to the outside of the battery cell receiving portion.

2. The battery module according to claim 1, wherein: The battery cell cover member comprises: a cover body configured to support the first battery cell; and A cover portion is configured to cover one side of the first battery cell in the up-down direction and is formed to be cut away from the cover body under the pressure of the fluid generated in the first battery cell.

3. The battery module according to claim 2, wherein: The cover body comprises: The blocking portion is disposed between the first battery cell and the second battery cell to separate the first battery cell from the second battery cell.

4. The battery module according to claim 2, wherein: The battery cell cover member further includes: A guide cutout portion extends along an outer circumference of the cover portion.

5. The battery module according to claim 2, wherein: The battery cell cover member comprises: a first guide cutout portion, the first guide cutout portion being disposed on the cover portion and extending along a first direction; A second guide cutout portion extends along a second direction intersecting the first direction.

6. The battery module according to claim 2, wherein: The battery cell cover member comprises: A guide cutout portion is disposed on the cover body and extends along a longitudinal direction of the cover body.

7. The battery module according to claim 1, wherein: Also includes: A fire-resistant cover member is disposed on one side of the battery cell cover member in the vertical direction and forms a guide portion that discharges fluid generated at the battery cell from the one side of the battery cell cover member in the vertical direction to the outside of the battery cell accommodating portion.

8. The battery module according to claim 7, wherein: The fire-resistant cover member forms the guide portion by cutting a fire-resistant cover portion, which is arranged on one side in the vertical direction of the battery cell cover member and is formed to be cut under the pressure of the fluid generated in the battery cell.

9. The battery module according to claim 8, wherein: The refractory cover member further comprises: A refractory guide cutout portion extends along a length direction of the refractory cover portion or along a circumferential direction of the refractory cover portion.

10. The battery module according to claim 7, wherein: The guide portion includes a hole formed on the refractory cover member.

11. The battery module according to claim 7, wherein: The thickness of the battery cell cover member in the up-down direction or the horizontal direction is formed to be thinner than the thickness of the fire-resistant cover member in the up-down direction or the horizontal direction.

12. The battery module according to claim 2, wherein: The battery unit further comprises: a third battery cell, the third battery cell being arranged on the opposite side of the first battery cell in the horizontal direction to the side where the second battery cell is located, and being covered by the cover body together with the first battery cell, The cover body comprises: a first blocking portion, the first blocking portion being disposed between the first battery unit and the second battery unit; The second blocking portion corresponds to the first blocking portion and covers the other side of the third battery cell opposite to the side facing the first battery cell.

13. The battery module according to claim 12, wherein: A supporting member is arranged between the first battery cell and the third battery cell.

14. The battery module according to claim 13, wherein: The supporting member is a surface pressure member or a refractory sheet.

15. The battery module according to claim 1, wherein: The battery cell cover member comprises: a first battery cell cover member configured to support the first battery cell; and a second battery cell cover member configured to support a second battery cell disposed on one side in a horizontal direction of the first battery cell and disposed on one side in a horizontal direction of the first battery cell cover member; Here, a supporting member is arranged between the first battery cell cover member and the second battery cell cover member.

16. The battery module according to claim 1, wherein: The module framework includes: A first side frame and a second side frame are arranged in parallel with each other to apply pressure to the battery cell in a horizontal direction on both sides of the battery cell in a horizontal direction.

17. The battery module according to claim 16, wherein: The battery cell cover member is disposed between the first side frame and the second side frame so as to cover the upper side of the first battery cell. The upper side of the battery cell cover member is arranged in an open manner.

18. The battery module according to claim 1, wherein: The battery unit further comprises: a third battery unit, the third battery unit being arranged on a side of the first battery unit opposite to a side of the first battery unit in a horizontal direction where the second battery unit is located; The battery cell cover member comprises: a blocking portion, the blocking portion being disposed between the first battery cell and the third battery cell to separate the first battery cell from the third battery cell; and The battery cell opening portion is configured to open a surface of the first battery cell that faces the second battery cell.

19. The battery module according to claim 12, wherein: The cover body also includes: A base portion connects the first blocking portion and the second blocking portion and covers the other side of the first battery cell in the up-down direction.

20. The battery module according to claim 3, wherein: The cover body comprises: a first cover portion extending from the blocking portion to cover one side in a vertical direction of the first battery unit; and A second cover portion extends from the blocking portion to cover one side of the second battery cell in a vertical direction.

21. The battery module according to claim 1, wherein: Also includes: a sensing plate disposed between the module frame and the battery unit; and The partition wall is disposed between the module frame and the sensor plate.

22. The battery module according to claim 21, wherein: The partition wall is connected to the sensing board and extends from the sensing board toward the module frame.

23. The battery module according to claim 21, wherein: The partition wall is connected to the module frame and extends from the module frame toward the sensing board.

24. The battery module according to claim 1, wherein: A refractory mat or refractory material is disposed between the module frame and the battery cells.

25. A battery cell cover member comprising: a cover body, wherein the cover body is configured to support a preset first battery unit; and A cover portion is connected to the cover body and is separated from the cover body under the action of the fluid pressure to form a discharge portion for discharging the fluid to the outside of the cover body in order to prevent the fluid generated from the first battery cell from flowing to a second battery cell different from the first battery cell.

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