Battery cell assembly and battery pack comprising same

Abstract

According to exemplary embodiments, a battery pack is provided. The battery pack may comprise: a base plate; and a battery cell assembly on the base plate, the battery cell assembly including a plurality of cell units arranged in a first horizontal direction. Each of the plurality of cell units may include: a battery cell; a frame exposing first and second side surfaces of the battery cell in the first horizontal direction and surrounding the battery cell; a cooling fin including a plate portion on the first side surface of the battery cell, and first and second discharge portions perpendicular to the plate portion and parallel to the base plate; and a pad on the second side surface. The first discharge portion may be farther from the base plate than the second discharge portion, and the first discharge portion may include a first slit. The frame may include a second slit overlapping the first slit in a vertical direction between the first discharge portion and the battery cell.

Description

Battery cell assembly and battery pack including the same

[0001] The present invention relates to a battery cell assembly and a battery pack including the same. The present application claims the benefit of Korean application No. 10-2025-0020590, filed on February 18, 2025, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for various wireless devices such as handsets, laptops, and cordless vacuum cleaners. Recently, as the manufacturing cost per unit capacity of secondary batteries has decreased dramatically due to improved energy density and economies of scale, and as the driving range of BEVs (battery electric vehicles) has increased to a level equivalent to that of fuel vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological development trend for secondary batteries in mobility is the improvement of energy density and safety. Here, energy density of a secondary battery is defined as the maximum electrical energy that can be stored by the battery's mass. Since high energy density is directly linked to the driving efficiency and range of mobility vehicles, various studies are being conducted to improve this energy density. The safety of secondary batteries is critical as it is directly related to the lives of mobility users. A key challenge for enhancing secondary batteries is providing solutions to prevent thermal propagation and thermal runaway within the battery pack.

[0004] The problem that the technical concept of the present invention aims to solve is to provide a battery cell assembly with enhanced cooling performance and rigidity, and a battery pack with improved energy density.

[0005] According to exemplary embodiments for solving the above-described problem, a battery pack is provided. The battery pack may include a base plate; and a battery cell assembly comprising a plurality of cell units arranged in a first horizontal direction on the base plate. Each of the plurality of cell units may include a battery cell; a frame surrounding the battery cell while exposing first and second sides of the battery cell in the first horizontal direction; a cooling fin comprising a plate portion on the first side of the battery cell and first and second discharge portions perpendicular to the plate portion and parallel to the base plate; and a pad on the second side. The first discharge portion is further from the base plate than the second discharge portion, and the first discharge portion may include a first slit. The frame may include a second slit that overlaps in a direction perpendicular to the first slit between the first discharge portion and the battery cell.

[0006] The above frame may include a first rib between the first discharge portion and the battery cell, comprising the second slit; a second rib between the second discharge portion and the battery cell; and third and fourth ribs connecting the first and second ribs, spaced apart in a second horizontal direction perpendicular to the first horizontal direction.

[0007] The battery cell can be inserted into the hollow defined by the first to fourth ribs.

[0008] The battery pack may further include a lower TIM (Thermal Interface Material) layer located between the base plate and the battery cell assembly and in contact with the second discharge portion.

[0009] The battery pack may further include an upper TIM layer in contact with the first discharge portion and including third slits. Each of the third slits may overlap in a vertical direction with each of the first and second slits of the corresponding cell units.

[0010] The battery pack may further include side walls surrounding the battery cell assembly and perpendicular to the base plate; a lead plate connected to the side walls on the battery cell assembly; and an exhaust passage between the upper TIM layer and the lead plate.

[0011] The battery cell can communicate with the discharge passage through the first to third slits.

[0012] The battery pack may further include a fire-resistant film located between the battery cell assembly and the upper TIM layer and overlapping in a vertical direction with the third slits.

[0013] The above fire-resistant film may further include a cut line that overlaps with each of the above third slits.

[0014] Each of the first and second slits can be extended in a second horizontal direction perpendicular to the first horizontal direction.

[0015] The battery pack may further include an adhesive layer between adjacent cell units.

[0016] The battery pack may further include a first adhesive layer between the first side of the battery cell and the plate portion; and a second adhesive layer between the second side of the battery cell and the pad.

[0017] According to exemplary embodiments for solving the above-described problem, a battery cell assembly is provided. The battery cell assembly may include a plurality of cell units arranged in a first horizontal direction. Each of the plurality of cell units may include: a battery cell; a frame surrounding the battery cell and exposing first and second sides of the battery cell in the first horizontal direction; a cooling fin comprising a plate portion on the first side of the battery cell and first and second discharge portions perpendicular to the plate portion and spaced parallel to each other; and a pad on the second side. The first discharge portion may include a first slit. The frame may include a second slit that overlaps with the first slit.

[0018] Each of the first and second discharge parts can come into contact with the frame.

[0019] Each of the first and second slits can be extended in a second horizontal direction perpendicular to the first horizontal direction.

[0020] According to exemplary embodiments of the present invention, a battery cell assembly may include a plurality of cell units joined by an adhesive layer, etc. Each of the plurality of cell units may include a battery cell, a frame surrounding the battery cell, cooling fins for cooling the battery cell, and a pad. Accordingly, the structural rigidity and cooling performance of the battery cell assembly may be enhanced.

[0021] According to exemplary embodiments of the present invention, a battery pack may include a battery cell assembly coupled to a base plate by a TIM layer. Accordingly, the efficiency of the assembly process of the battery cell assembly into the pack housing is improved, and the energy density of the battery pack can be improved.

[0022] The effects obtainable from the exemplary embodiments of the present invention are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure belong from the following description. That is, unintended effects resulting from the implementation of the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0023] FIG. 1 is a perspective view of a battery pack according to exemplary embodiments.

[0024] FIG. 2 is a partial enlarged view of a battery pack according to exemplary embodiments.

[0025] FIG. 3 is a perspective view showing a cell unit according to exemplary embodiments.

[0026] FIG. 4 is an exploded perspective view showing a cell unit according to exemplary embodiments.

[0027] FIG. 5 is a cross-sectional view showing a battery pack according to exemplary embodiments.

[0028] FIG. 6 is an enlarged cross-sectional view showing a battery pack according to exemplary embodiments.

[0029] FIG. 7 is a cross-sectional view illustrating the gas exhaust path of a battery pack according to exemplary embodiments.

[0030] FIG. 8 is a cross-sectional view showing a battery pack according to exemplary embodiments.

[0031] FIG. 9 is a top view showing an upper TIM layer and a refractory sheet according to exemplary embodiments.

[0032] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

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

[0034] In addition, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the invention, such detailed description is omitted.

[0035] Since embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically depicted for clearer explanation. Accordingly, the size or proportion of each component does not entirely reflect the actual size or proportion.

[0036]

[0037] (1st embodiment)

[0038] FIG. 1 is a perspective view of a battery pack (100) according to exemplary embodiments. FIG. 2 is an enlarged perspective view showing a part of a battery pack (100) according to exemplary embodiments.

[0039] FIG. 3 is a perspective view showing a cell unit (120U) according to exemplary embodiments. FIG. 4 is an exploded perspective view showing a cell unit (120U) according to exemplary embodiments.

[0040] FIG. 5 is a cross-sectional view showing a battery pack (100) according to exemplary embodiments. FIG. 5 illustrates a cross-section along A-A' of FIG. 1. FIG. 6 is an enlarged cross-sectional view showing a battery pack (100) according to exemplary embodiments. FIG. 6 illustrates P1 of FIG. 5 in enlargement.

[0041] FIG. 7 is a cross-sectional view illustrating the state in which a fire event occurs in a battery pack (100) according to exemplary embodiments. In FIG. 7, an arrow without a drawing number illustrates the path of movement of fire byproducts.

[0042]

[0043] Referring to FIGS. 1 through 6, a battery pack (100) may include a pack housing (110), a lower TIM (Thermal Interface Material) layer (117), battery cell assemblies (120), an upper TIM layer (130), an exhaust passage (140), and a lead plate (150). In FIG. 1, the illustration of the lead plate (150) is omitted.

[0044] The pack housing (110) may include a base plate (111), a center beam (112), a cross beam (113), and side walls (114). Here, two directions substantially parallel to the mounting surface of the base plate (111) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the mounting surface of the base plate (111) is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other.

[0045] The base plate (111) can support a plurality of battery cell assemblies (120). The base plate (111) may have a flat plate shape.

[0046] The center beam (112) and the cross beam (113) can partition the space in which the battery cell assembly (120) is mounted. The center beam (112) and the cross beam (113) can be surrounded by side walls (114). The center beam (112) and the cross beam (113) can divide the space defined by the pack housing (110).

[0047] The center beam (112) may extend in the X direction. The center beam (112) may be formed by an extrusion process together with the base plate (111) or welded to the base plate (111). The center beam (112) may isolate the battery cell assemblies (120) in the Y direction.

[0048] Each cross beam (113) may extend in the Y direction. The cross beam (113) may be in contact with the center beam (112) at one end, or may intersect with the center beam (112).

[0049] The side walls (114) may be substantially perpendicular to the base plate (111). The side walls (114) may be adjacent to the edge portions of the base plate (111). The side walls (114) may be joined to the edge portions of the base plate (111). The side walls (114) may horizontally surround a plurality of battery cell assemblies (120).

[0050] Referring to FIG. 5, one or more of the side walls (114) may include at least one venting hole (114H). The battery pack (100) may include an exhaust device (not shown) coupled to the venting hole (114H). The exhaust devices may be configured to delay heat propagation by releasing high-temperature gas inside the battery pack (100) to the outside when at least one of the plurality of battery cell assemblies (120) is in a thermal runaway state.

[0051] Here, thermal runaway of multiple battery cell assemblies (120) is a state in which a temperature change of multiple battery cell assemblies (120) further accelerates the temperature change, which is an uncontrollable positive feedback. Multiple battery cell assemblies (120) in a thermal runaway state exhibit a rapid temperature rise and emit a large amount of high-pressure gas and combustion residue.

[0052]

[0053] The lower TIM layer (117) may be located between the base plate (111) and each battery cell assembly (120). The lower TIM layer (117) may be in contact with the base plate (111). The lower TIM layer (117) may be in contact with the discharge portion (122D2) of each cell unit (120U).

[0054] The lower TIM layer (117) may have high thermal conductivity. The lower TIM layer (117) may transfer heat generated from the battery cell assemblies (120) to the base plate (111). The base plate (111) may include a material having low thermal resistance (e.g., aluminum). The heat transferred to the base plate (111) may be dispersed to the outside of the battery pack (100).

[0055] The lower TIM layer (117) can prevent an air layer from forming between the base plate (111) and the battery cell assemblies (120). Accordingly, cooling of the plurality of battery cell assemblies (120) can be promoted. The lower TIM layer (117) may be, for example, a thermal pad.

[0056] The lower TIM layer (117) can provide adhesion. Each of the battery cell assemblies (120) can be fixed on the base plate (111) by the lower TIM layer (117). The battery cell assemblies (120) can be fixed to the pack housing (110) without separate mechanical means such as bolting. Accordingly, structures such as beams for fixing the battery cell assemblies (120) are eliminated, and the energy density of the battery pack (100) can be improved.

[0057]

[0058] A plurality of battery cell assemblies (120) may be placed on the mounting surface of the base plate (111) of the pack housing (110). The battery cell assemblies (120) may be arranged in the X direction and the Y direction. In this example, two battery cell assemblies (120) are arranged in the Y direction, so that the plurality of battery cell assemblies (120) form a matrix of 2 rows and 1 column, but this is for illustrative purposes only and does not limit the technical concept of the present invention in any sense.

[0059] Each of the battery cell assemblies (120) may include a plurality of cell units (120U) arranged in the X direction. Referring to FIGS. 3 through 5, each of the cell units (120U) may include a battery cell (121), a cooling fin (122), a frame (123), and a pad (124). In FIG. 3, the illustration of the pad (124) is omitted.

[0060] A battery cell (121) may include an electrode assembly, an electrolyte, and a case. The battery cell (121) may be any one of a cylindrical battery cell, a prismatic battery cell, and a pouch-type battery cell. The electrode assembly of a cylindrical battery cell is embedded in a cylindrical metal can. The electrode assembly of a prismatic battery cell is embedded in a prismatic metal can. The electrode assembly of a pouch-type battery cell is embedded in a pouch case containing an aluminum laminate sheet.

[0061] An electrode assembly includes an anode, a cathode, and a separator interposed between the anode and the cathode. A jelly roll type electrode assembly is formed by winding an anode, a cathode, and a separator interposed between them. A stack type electrode assembly includes a plurality of anodes, a plurality of cathodes, and a plurality of separators interposed between them, which are stacked sequentially.

[0062] According to exemplary embodiments, a plurality of battery cells (121) may form a plurality of banks. A plurality of banks may include one or more parallel-connected battery cells (121). A plurality of banks may be connected in series with each other. The number of battery cells (121) included in each of the plurality of banks and the number of banks connected in series with each other may be determined according to the voltage and current to be output through each of the plurality of battery cell assemblies (120).

[0063]

[0064] The cooling fins (122) may be configured to absorb and release heat generated from the battery cell (121). The cooling fins (122) may have high thermal conductivity. The cooling fins (122) may include a metallic material, for example, aluminum or stainless steel.

[0065] The cooling fin (122) may include a plate portion (122P) and a plurality of discharge portions (122D1, 122D2).

[0066] The plate portion (122P) may be in contact with the side of the battery cell (121) (121S1 in FIG. 4 and 6). The plate portion (122P) may be substantially perpendicular to the X direction. The plate portion (122P) may be substantially perpendicular to the mounting surface of the base plate (111). The plate portion (122P) may absorb heat generated from the battery cell (121). The heat absorbed by the plate portion (122P) may be conducted to a plurality of discharge portions (122D1, 122D2).

[0067] Each of the plurality of emission portions (122D1, 122D2) may be configured to emit heat absorbed from the battery cell (121). Each of the emission portions (122D1, 122D2) may be connected to the plate portion (122P). Each of the emission portions (122D1, 122D2) may be substantially perpendicular to the plate portion (122P). Each of the emission portions (122D1, 122D2) may be substantially parallel to the base plate (111). Each of the emission portions (122D1, 122D2) may extend in the Y direction. The emission portions (122D1, 122D2) may be spaced apart from each other in the Z direction.

[0068] Referring to FIG. 5, the discharge portion (122D1) may be in contact with the upper TIM layer (130), and the discharge portion (122D2) may be in contact with the lower TIM layer (117). Heat discharged from the discharge portion (122D1) may be dispersed through the upper TIM layer (130) to the discharge passage (140). Heat discharged from the discharge portion (122D2) may be dispersed through the lower TIM layer (117) to the base plate (111).

[0069] The discharge section (122D1) may be further from the base plate (111) than the discharge section (122D2). That is, the discharge section (122D1) may be located above the discharge section (122D2) in the Z direction. The discharge section (122D1) may include a slit (122D1S). The slit (122D1S) may extend in the Y direction. The slit (122D1S) may be configured to discharge heat in the event that excessive heat is generated from the battery cell (121) due to a fire event, etc.

[0070]

[0071] The frame (123) may surround the battery cell (121) while exposing the sides of the battery cell (121) in the X direction (121S1, 121S2 in FIG. 4 and 6). The frame (123) may be located between the battery cell (121) and the cooling fin (122). As each of the cell units (120U) includes the cooling fin (122) and the frame (123), the rigidity of the battery cell assembly (120) may be improved.

[0072] Referring to FIGS. 4 and 5, the frame (123) may include a plurality of ribs (123R1, 123R2, 123R3, 123R4).

[0073] A rib (123R1) may be located between the battery cell (121) and the discharge portion (122D1) of the cooling fin (122). The rib (123R1) may be in contact with each of the discharge portion (122D1) of the battery cell (121) and the cooling fin (122). A rib (123R2) may be located between the battery cell (121) and the discharge portion (122D2) of the cooling fin (122). The rib (123R2) may be in contact with each of the discharge portion (122D2) of the battery cell (121) and the cooling fin (122). The ribs (123R1, 123R2) may be spaced apart from each other in the Z direction. Each of the ribs (123R1, 123R2) may be substantially parallel to the Y direction.

[0074] Each of the ribs (123R3, 123R4) can connect the ribs (123R1, 123R2) to each other. The ribs (123R3, 123R4) can be spaced apart from each other in the Y direction. Each of the ribs (123R3, 123R4) can be substantially parallel to the Z direction.

[0075] The ribs (123R1, 123R2, 123R3, 123R4) can define the hollow portion (123A). A battery cell (121) can be accommodated in the hollow portion (123A).

[0076] The rib (123R1) may include a slit (123R1S). The slit (123R1S) of the rib (123R1) may overlap with the slit (122D1S) of the discharge portion (122D1) in the Z direction. The slit (123R1S) may extend in the Y direction. The slit (123R1S) of the rib (123R1), together with the slit (122D1S) of the discharge portion (122D1), may be configured to discharge heat when excessive heat is generated from the battery cell (121) due to a fire event or the like.

[0077]

[0078] The pad (124) may be on the side of the battery cell (121) (121S2 in FIG. 4). The pad (124) may include a flexible material. The pad (124) may absorb swelling of the battery cell (121). In some embodiments, the pad (124) may be a thermal barrier. In some embodiments, the pad (124) may have a high melting temperature and low thermal conductivity. In some embodiments, the pad (124) may include a flame-retardant material, such as ceramic and coated glass material. In some embodiments, the pad (124) may be configured to release a fire retarding material and a fire extinguishing agent in the event of a thermal runaway event.

[0079]

[0080] The upper TIM layer (130) may be located between the battery cell assembly (120) and the lead plate (150). The upper TIM layer (130) may be in contact with the battery cell assembly (120). The upper TIM layer (130) may be in contact with the discharge portion (122D1) of each of the cell units (120U).

[0081] The upper TIM layer (130) may have high thermal conductivity. The upper TIM layer (130) may absorb heat generated from the battery cell assemblies (120) and transfer it to the exhaust passage (140). Accordingly, cooling of the multiple battery cell assemblies (120) may be promoted. The upper TIM layer (130) may be, for example, a thermal pad.

[0082] The upper TIM layer (130) may include a plurality of slits (130S). Each of the plurality of slits (130S) may overlap with the slits (122D1S, 123R1S) of the corresponding cell units (120U) in the Z direction. The slits (130S) of the upper TIM layer (130) may be configured to rapidly dissipate heat generated from the battery cell (121) together with the slits (122D1S, 123R1S) of each cell unit (120U).

[0083]

[0084] A lead plate (150) may be located on top of the battery cell assemblies (120). The lead plate (150) may cover elements placed inside the battery pack (100), such as the battery cell assemblies (120) and electrical components (not shown). The lead plate (150) may be spaced apart from the battery cell assemblies (120) in the Z direction. The lead plate (150) may be connected to the side walls (114) of the pack housing (110). The lead plate (150) may be secured to the battery pack (100) by mechanical fastening means, such as bolts.

[0085]

[0086] The exhaust passage (140) may be located between the battery cell assemblies (120) and the lead plate (150). The exhaust passage (140) may provide a passage for heat generated from the battery cell assemblies (120) to be discharged.

[0087] For example, FIG. 7 illustrates the exhaust path of gas when a fire event occurs in a battery cell (121) of any one of the battery cell assemblies (120). In FIG. 7, arrows without drawing numbers indicate the direction of heat movement.

[0088] Referring to FIG. 7, fire byproducts such as heat or high-temperature gas generated in the battery cell (121) can move to the exhaust passage (140) through the slits (123R1S, 122D1S, 130S). The upper TIM layer (130) can absorb the heat generated from the battery cell (121) and discharge it to the exhaust passage (140). The fire byproducts moved to the exhaust passage (140) can be discharged to the outside of the battery pack (100) through the holes (114H) of the side walls (114). This prevents or delays heat propagation and thermal runaway of the battery pack (100).

[0089]

[0090] Referring to FIG. 6, the battery pack (100) may include a plurality of adhesive layers (171, 172, 173). The plurality of adhesive layers (171, 172, 173) can bond the components of the battery cell assembly (120) to each other.

[0091] The adhesive layer (171) may be located between the battery cell (121) and the cooling fin (122). The adhesive layer (171) may be in contact with the plate portion (122P) of the cooling fin (122). The adhesive layer (171) may be in contact with the side (121S1) of the battery cell (121).

[0092] The adhesive layer (172) may be located between the battery cell (121) and the pad (124). The adhesive layer (172) may be in contact with the side (121S2) of the battery cell (121). The adhesive layer (172) may be in contact with the pad (124).

[0093] The adhesive layer (173) may be located between the cooling fin (122) and the pad (124). The adhesive layer (173) may be in contact with the plate portion (122P) of the cooling fin (122). The adhesive layer (173) may be in contact with the pad (124).

[0094]

[0095] Although not shown in the drawing, the battery pack (100) may further include interbusbars. Multiple battery cell assemblies (120) may be connected in series by the interbusbars, and the battery pack (100) may output a high voltage.

[0096] Although not shown in the drawing, the battery pack (100) may further include electrical components. The electrical components may be placed within the pack housing (110). The electrical components may be placed between one of the side walls (114) where exhaust devices are installed and a plurality of battery cell assemblies (120).

[0097] Electrical components may include, for example, a BMS. The BMS may be configured to perform monitoring, balancing, and control of the battery pack. Monitoring of the battery pack (100) may include measuring the voltage and current of specific nodes within a plurality of battery cell assemblies (120) and measuring the temperature of set locations within the battery pack (100). The battery pack (100) may include sensors for measuring the voltage, current, and temperature described above.

[0098] Balancing of the battery pack (100) is an operation that reduces deviations between multiple battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack (100) can operate under optimal conditions, and accordingly, the shortening of the lifespan of each of the multiple battery cell assemblies (120) can be prevented.

[0099] The electrical components may further include a cooling device, a PRA (Power Relay Assembly), and a safety plug. The cooling device may include a cooling fan. The cooling fan can prevent overheating of each of the multiple battery cell assemblies (120) by circulating air inside the battery pack (100). The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA can protect the multiple battery cell assemblies (120) and the external load (e.g., a vehicle motor) by cutting off power supply to the external load (e.g., a vehicle motor) in situations where abnormal voltage occurs, such as a voltage surge.

[0100]

[0101] (2nd Example)

[0102] FIG. 8 is a cross-sectional view showing a battery pack (100') according to exemplary embodiments. FIG. 9 is a top view showing an upper TIM layer (130) and a fire-resistant film (160) according to exemplary embodiments.

[0103] In FIGS. 8 and 9, the components having the same drawing numbers as in FIGS. 1 to 7 may be described as described above in the first embodiment, and such descriptions will be omitted. Hereinafter, the components of the second embodiment that differ from the first embodiment will be described in detail.

[0104]

[0105] The battery pack (100') of FIG. 8 differs from the battery pack (100) of FIG. 1 to FIG. 7 in that it further includes a fire-resistant film (160).

[0106] A fire-resistant film (160) may be located between the battery cell assembly (120) and the upper TIM layer (130). The fire-resistant film (160) may separate the battery cell (121) from the discharge passage (140). The fire-resistant film (160) may separate the slits (122D1S, 123R1S) from the slits (130S). The fire-resistant film (160) may be exposed to the discharge passage (140) by the slits (130S) of the upper TIM layer (130).

[0107] Referring together with FIG. 9, the fire-resistant film (160) may include cut lines (160L). Each cut line (160L) may overlap in the Z direction with a corresponding slit (130S) of the upper TIM layer (130). Each cut line (160L) may overlap in the Z direction with a corresponding battery cell (121).

[0108] When heat is generated in the battery cell (121) due to a fire event or the like, the pressure in the containment space of the battery cell (121) may increase. Accordingly, the fire-resistant film (160) in the area overlapping with the ignited battery cell (121) may rupture. Each of the cut lines (160L) can facilitate the rupture of the fire-resistant film (160) due to the ignition of the battery cell (121). Heat generated from the ignited battery cell (121) can be discharged through the ruptured part of the fire-resistant film (160) to the discharge passage (140).

[0109] Additionally, the fire-resistant film (160) can prevent fire byproducts flowing through the discharge passage (140) from flowing back into adjacent battery cells (121). Accordingly, heat propagation to adjacent battery cells (121) is prevented, and efficient heat discharge to the outside of the battery pack (100') is possible.

[0110] In FIG. 9, each of the incision lines (160L) is depicted as a straight line extending in the Y direction, but is not limited thereto. In some other embodiments, each of the incision lines (160L) may be H-shaped or may consist of a plurality of spaced straight lines.

[0111]

[0112] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

Claims

1. Base plate; and A battery cell assembly comprising a plurality of cell units arranged in a first horizontal direction on the base plate, and Each of the above plurality of cell units is, Battery cell; A frame surrounding the battery cell while exposing the first and second sides of the battery cell in the first horizontal direction; A cooling fin comprising a plate portion on the first side of the battery cell, and first and second discharge portions perpendicular to the plate portion and parallel to the base plate; and Includes a pad on the second side above, The first discharge portion is further from the base plate than the second discharge portion, and the first discharge portion includes a first slit, and A battery pack comprising a frame that includes a second slit overlapping in a vertical direction with the first slit between the first discharge portion and the battery cell.

2. In Paragraph 1, The above frame is, A first rib including the second slit and located between the first discharge part and the battery cell; A second rib between the second discharge part and the battery cell; and A battery pack characterized by connecting the first and second ribs, and including third and fourth ribs spaced apart in a second horizontal direction perpendicular to the first horizontal direction.

3. In Paragraph 2, A battery pack characterized in that the battery cell is inserted into a hollow defined by the first to fourth ribs.

4. In Paragraph 1, A battery pack characterized by further including a lower TIM (Thermal Interface Material) layer located between the base plate and the battery cell assembly and in contact with the second discharge portion.

5. In Paragraph 1, Further comprising an upper TIM layer in contact with the first discharge portion and including third slits, and A battery pack characterized in that each of the above-mentioned third slits overlaps in a vertical direction with each of the above-mentioned first and second slits of the corresponding cell units.

6. In Paragraph 5, Side walls surrounding the battery cell assembly and perpendicular to the base plate; A lead plate connected to the sidewalls on the battery cell assembly; and A battery pack characterized by further including an exhaust passage between the upper TIM layer and the lead plate.

7. It is in Paragraph 6, and A battery pack characterized in that the battery cell communicates with the discharge passage through the first to third slits.

8. In Paragraph 5, A battery pack characterized by further including a fire-resistant film located between the battery cell assembly and the upper TIM layer and overlapping in a vertical direction with the third slits.

9. In Paragraph 8, A battery pack characterized in that the above-mentioned fire-resistant film further includes a cut line that overlaps with each of the above-mentioned third slits.

10. In Paragraph 1, A battery pack characterized in that each of the first and second slits extends in a second horizontal direction perpendicular to the first horizontal direction.

11. In Paragraph 1, A battery pack characterized by further including an adhesive layer between adjacent cell units.

12. In Paragraph 1, A first adhesive layer between the first side of the battery cell and the plate portion; and A battery pack characterized by further including a second adhesive layer between the second side of the battery cell and the pad.

13. Includes a plurality of cell units arranged in a first horizontal direction, and Each of the above plurality of cell units is, Battery cell; A frame that surrounds the battery cell and exposes the first and second sides of the battery cell in the first horizontal direction; A cooling fin comprising a plate portion on a first side of the battery cell, and first and second discharge portions perpendicular to the plate portion and spaced apart parallel to each other; and Includes a pad on the second side above, The above-mentioned first discharge portion includes a first slit, and A battery cell assembly, wherein the frame includes a second slit that overlaps with the first slit.

14. In Paragraph 13, A battery cell assembly characterized in that each of the first and second discharge portions is in contact with the frame.

15. In Paragraph 13, A battery cell assembly characterized in that each of the first and second slits extends in a second horizontal direction perpendicular to the first horizontal direction.

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