Battery pack

Abstract

According to exemplary embodiments, a battery pack is provided. The battery pack may comprise: a base plate; sidewalls on the edge of the base plate; a plurality of partition walls defining venting paths on the base plate; a cooling plate on the plurality of partition walls; a battery module on the cooling plate; and a lead plate, which is on the battery module and is connected to the sidewalls. The battery module can include: a module frame, which includes a bottom plate including venting holes, side plates perpendicular to the bottom plate, and a top plate on the side plates; a plurality of battery cells inside the module frame; and a filler filling the inner space of the module frame.

Description

battery pack

[0001] The present invention relates to a battery pack. The present application claims the benefit of Korean application No. 10-2025-0008776, filed on January 21, 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] In the current trend emphasizing secondary batteries for mobility, the primary direction of secondary battery technology development is to reduce production costs and enhance safety. Secondary batteries account for the largest share of a BEV's manufacturing cost. Therefore, the production cost of secondary batteries is the most critical factor in increasing the market share of BEVs compared to internal combustion engine vehicles. Cost reduction can be achieved through the reduction of raw materials, the decrease in the number of steps in the production process, and the shortening of cycle times. The safety of secondary batteries is critical as it is directly linked to the lives of mobility passengers. A key challenge for enhancing secondary battery safety is the provision of cooling solutions for battery packs.

[0004] The problem that the technical concept of the present invention aims to solve is to provide a battery pack with enhanced safety.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack is provided. The battery pack may include: a base plate; side walls on the edges of the base plate; a plurality of bulkheads defining venting paths on the base plate; a cooling plate on the plurality of bulkheads; a battery module on the cooling plate; and a lead plate on the battery module and connected to the side walls. The battery module may include a module frame comprising a bottom plate having venting holes, side plates perpendicular to the bottom plate, and a top plate on the side plates; a plurality of battery cells inside the module frame; and a filler filling the internal space of the module frame.

[0006] Each of the above venting holes can overlap with a corresponding one of the battery cells in a vertical direction.

[0007] The above cooling plate may include cooling holes that overlap in a vertical direction with a corresponding one of the above venting holes.

[0008] The battery cells can be connected to the venting passes through the venting holes and the cooling holes.

[0009] Each of the above battery cells may overlap with two or more of the above venting holes in a vertical direction.

[0010] The battery pack may further include a thermal resin layer between the battery module and the cooling plate.

[0011] The above plurality of bulkheads can be spaced apart from each other in a first direction.

[0012] The battery pack may further include a center beam extending in the first direction on the base plate. Each of the plurality of partitions may extend in a second direction perpendicular to the first direction between the side wall and the center beam, and may be spaced apart from each of the side wall and the center beam.

[0013] Each of the above-mentioned venting passes can overlap in a vertical direction with a corresponding one of the plurality of battery cells.

[0014] Each of the above-mentioned venting passes may overlap in a vertical direction with two or more corresponding of the plurality of battery cells.

[0015] The battery pack may further include a first bonding layer between each of the bulkheads and the base plate; and a second bonding layer between each of the bulkheads and the cooling plate.

[0016] The magnitude of the bonding force of each of the above bulkheads to the base plate by the above first bonding layer may be different from the magnitude of the bonding force of each of the above bulkheads to the cooling plate by the above second bonding layer.

[0017] The first bonding layer above may be a welding layer, and the second bonding layer may be an adhesive layer.

[0018] The first bonding layer is an adhesive layer, and the second bonding layer may be a welding layer.

[0019] The battery pack may further include channels embedded in the side walls. One end of each of the channels may be connected to the venting passes, and the other end of each of the channels may be configured to communicate with the outside of the battery pack.

[0020] According to exemplary embodiments of the present invention, venting within the battery pack is directed downward, and a venting path connected to the outside is provided at the bottom of the battery pack, thereby enabling smooth pressure release in the event of a fire in the battery pack. Accordingly, damage to the battery pack can be prevented, and thermal propagation and thermal runaway within the battery pack can be prevented.

[0021] 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.

[0022] FIG. 1 is a top view of a battery pack according to exemplary embodiments.

[0023] FIG. 2 is a top view of a pack housing according to exemplary embodiments.

[0024] FIG. 3 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0025] FIG. 4 is a cross-sectional view of a battery pack according to exemplary embodiments.

[0026] FIG. 5 is a cross-sectional view of a battery module in exemplary embodiments.

[0027] FIG. 6 is a cross-sectional view showing the fire occurrence state of a battery pack according to exemplary embodiments.

[0028] FIG. 7 is a cross-sectional view showing the fire occurrence state of a battery pack according to exemplary embodiments.

[0029] FIG. 8 is a cross-sectional view showing the fire occurrence state of a battery pack according to exemplary embodiments.

[0030] FIG. 9 is a top view of a pack housing according to exemplary embodiments.

[0031] FIG. 10 is a cross-sectional view of a battery pack 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 top view showing a battery pack (100) according to exemplary embodiments.

[0039] FIG. 2 is a top view showing a pack housing (110) according to exemplary embodiments.

[0040] FIGS. 3 and FIGS. 4 are cross-sectional views illustrating a battery pack (100) according to exemplary embodiments. FIG. 3 illustrates a cross-section of the battery pack (100) at position A-A' in FIGS. 1 and FIG. 2. FIG. 4 illustrates a cross-section of the battery pack (100) at position B-B' in FIGS. 1 and FIG. 2.

[0041] FIG. 5 is a cross-sectional view showing a battery module (130) according to exemplary embodiments.

[0042]

[0043] Referring to FIGS. 1 through 5, the battery pack (100) may include a pack housing (110), bulkheads (120), cooling plates (125), thermal resin layers (129), battery modules (130), lead plates (150), and reinforcing structures (160). In FIG. 1, the packing member (147), lead plates (150), and reinforcing structures (160) are omitted from the illustration.

[0044]

[0045] The pack housing (110) may include a base plate (111), a center beam (112), cross beams (113) and side walls (114).

[0046] The base plate (111) may have a flat plate shape. Two directions substantially parallel to the upper surface (111M) of the base plate (111) are defined as the X direction and the Y direction, and a direction substantially perpendicular to the upper surface (111M in FIG. 3 and FIG. 4) 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.

[0047] The center beam (112) and cross beams (113) can divide the space defined by the pack housing (110). The center beam (112) and cross beams (113) can partition the space in which each of the battery modules (130) is mounted. The center beam (112) and cross beams (113) can be surrounded by side walls (114).

[0048] In this example, the center beam (112) and the cross beams (113) isolate the receiving space of the pack housing (110) into a matrix of 4 rows and 2 columns, but this is for illustrative purposes only and does not limit the technical concept of the invention in any sense.

[0049] 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). Each of the cross beams (113) may intersect the center beam (112). Each of the cross beams (113) may extend in the Y direction. The cross beams (113) may be spaced apart from each other in the X direction.

[0050] 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).

[0051]

[0052] A plurality of bulkheads (120) may be located at the bottom of each battery module (130). A plurality of bulkheads (120) may be located between the base plate (111) and the cooling plate (125). A plurality of bulkheads (120) may be located between adjacent cross beams (113) or between the cross beam (113) and the side wall (114).

[0053] One end of each bulkhead (120) can be fixed to the upper surface (111M) of the base plate (111). The other end of each bulkhead (120) can be fixed to the cooling plate (125). Referring to FIG. 4, one end of each bulkhead (120) can be fixed to the base plate (111) by a bonding layer (101), and the other end of each bulkhead (120) can be fixed to the cooling plate (125) by a bonding layer (102).

[0054] The magnitude of the bonding force to the base plate (111) of each partition (120) by the bonding layer (101) may differ from the magnitude of the bonding force to the cooling plate (125) of each partition (120) by the bonding layer (102). In some embodiments, the magnitude of the bonding force to the base plate (111) of each partition (120) by the bonding layer (101) may be greater than the magnitude of the bonding force to the cooling plate (125) of each partition (120) by the bonding layer (102). For example, each bonding layer (101) may be a welding layer, and each bonding layer (102) may be an adhesive layer.

[0055] A plurality of bulkheads (120) may be spaced apart from each other in the X direction. Each of the plurality of bulkheads (120) may extend in the Y direction. Each bulkhead (120) may be located between adjacent venting paths (123). Each bulkhead (120) may be spaced apart from the side wall (114) and the center beam (112). By doing so, the venting paths (123) at the bottom of each of the battery modules (130) may be connected to each other.

[0056]

[0057] Venting passages (123) may be located at the bottom of each battery module (130). Venting passages (123) may be located between the base plate (111) and the cooling plate (125). Venting passages (123) may be separated by a plurality of partitions (120).

[0058] Referring to FIG. 4, each venting pass (123) may overlap with a corresponding one of the battery cells (131) in the Z direction. Since adjacent venting passes (123) are separated by each of the partitions (120), direct heat propagation between the battery cells (131) through the venting passes (123) can be prevented or delayed.

[0059] Each venting pass (123) can be connected to a corresponding battery cell (131) by means of the cooling holes (125H) of the cooling plate (125), the connecting holes (129H) of the thermal resin layer (129), and the venting holes (141H) of the bottom plate (141). Heat generated from each battery cell (131) can be discharged through the holes (125H, 129H, 141H) to each venting pass (123).

[0060] The venting passes (123) may communicate with channels (114C) embedded in the side walls (114). The channels (114C) may be configured to communicate with the outside of the battery pack (100). Heat generated from the battery cells (131) and discharged into the venting passes (123) may be discharged to the outside of the battery pack (100) through the channels (114C).

[0061]

[0062] Each of the cooling plates (125) may be located between the partitions (120) and each of the battery modules (130). The cooling plates (125) may be configured to cool the battery modules (130). According to some embodiments, the cooling plates (125) may include built-in cooling lines (not shown). The cooling lines may provide a passage for the flow of a refrigerant such as water. However, the configuration and structure of the cooling plates (125) are not limited thereto and can be varied as long as they can cool the battery modules (130).

[0063] Each of the cooling plates (125) may include cooling holes (125H). The cooling holes (125H) may be connected to venting passes (123). Referring to FIGS. 3 and 4, each battery cell (131) may overlap with two cooling holes (125H). However, this is not limited thereto, and each battery cell (131) may overlap with one or more cooling holes (125H). The cooling holes (125H) overlapping with each battery cell (131) may be spaced apart along the longitudinal direction (Y direction) of each battery cell (131).

[0064] In FIGS. 1 and 4, an embodiment is illustrated in which each cooling plate (125) is provided at the bottom of each battery module (130), but is not limited thereto. According to some other embodiments, adjacent battery modules (130) in the Y direction may share a single cooling plate (125). According to some other embodiments, all battery modules (130) may share a single cooling plate (125).

[0065]

[0066] Thermal resin layers (129) may be configured to transfer heat generated from battery modules (130) to cooling plates (125). Each thermal resin layer (129) may be located between each cooling plate (125) and each battery module (130). The thermal resin layers (129) may have high thermal conductivity.

[0067] In some embodiments, thermal resin layers (129) may be provided by an application process of a thermal resin composition. The resin composition may be a room temperature curable composition. That is, the curing reaction of the resin composition may start and proceed at room temperature. The curing reaction of the resin composition may be accelerated at a temperature higher than room temperature. The rate of the curing reaction of the resin composition at a temperature higher than room temperature may be faster than the rate of the curing reaction of the resin composition at room temperature. As a non-limiting example, the main component of the resin composition may be any one of silicone resin, polyol resin, epoxy resin, and acrylic resin.

[0068] The curing agent of the resin composition can be selected according to the main component of the resin composition. For example, if the main component of the resin composition is a silicone resin, a siloxane compound may be used as the curing agent. For example, if the main component of the resin composition is a polyol resin, an isocyanate compound may be used as the curing agent. For example, if the main component of the resin composition is an epoxy resin, an amine compound may be used as the curing agent. For example, if the main component of the resin composition is an acrylic resin, an isocyanate compound may be used as the curing agent.

[0069] The inorganic filler of the resin composition may have relatively high thermal conductivity. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be about 1 W / m·K or higher. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be 5 W / m·K or higher. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be 10 W / m·K or higher. According to exemplary embodiments, the thermal conductivity of the inorganic filler of the resin composition may be about 15 W / m·K or higher.

[0070] According to some embodiments, the inorganic filler of the resin composition may include ceramic. For example, the inorganic filler of the resin composition may include any one of aluminum oxide (Al2O3), aluminum nitride (AlN), boron nitride (BN), silicon nitride (Si3N4), silicon carbide (SiC), beryllium oxide (BeO), zinc oxide (ZnO), aluminum hydroxide (Al(OH)3), and boehmite. The resin composition may also include a carbon filler. The resin composition may include, for example, any one of fumed silica, clay, and calcium carbonate.

[0071] Each of the thermal resin layers (129) may include connecting holes (129H). Each connecting hole (129H) may be aligned in the Z direction with a corresponding one of the venting holes (141H) and a corresponding one of the cooling holes (125H).

[0072]

[0073] Each of the battery modules (130) may include a module frame (140) and battery cells (131) housed in the internal space of the module frame (140). Each of the battery cells (131) may include electrode leads (131L) at both ends. Each of the electrode leads (131L) may pass through slits of the busbar frame (135) and be connected to each of the busbars (137).

[0074] Battery cells (131) can be stacked in the X direction inside the module frame (140). According to exemplary embodiments, each of the plurality of battery cells (131) may be bidirectional cells. That is, the positive terminal of each of the plurality of battery cells (131) may be placed at each end, and the negative terminal of each of the plurality of battery cells (131) may be placed at each other end. A person skilled in the art will be able to easily arrive at an embodiment in which each of the plurality of battery cells (131) is a unidirectional cell based on what is described herein.

[0075] Each of the plurality of battery cells (131) includes an electrode assembly, an electrolyte, and a case covering them. The case may be a pouch case or a rectangular case. The pouch case may include an aluminum laminate sheet. The rectangular case may include a metallic material such as aluminum. The rectangular case may have a rectangular prism shape.

[0076] An electrode assembly embedded in a case may include an anode, a cathode, and a separator interposed between the anode and the cathode. Depending on the assembly form, the electrode assembly may be either a jelly roll type or a stack type. A jelly roll type electrode assembly may include a wound structure of an anode, a cathode, and a separator interposed between them. A stack type electrode assembly may include a plurality of sequentially stacked anodes, a plurality of cathodes, and a plurality of separators interposed between them.

[0077] The battery module (130) may further include separators (not shown) for separating battery cells (131). Each separator may be interposed between battery cells (131). Multiple battery cells (131) and multiple separators may form a cell stack.

[0078] Multiple separators may include a compressible material. Multiple separators may absorb swelling of multiple battery cells (131). Multiple separators may be thermal barriers. According to exemplary embodiments, each of the multiple separators may have a high melting temperature and low thermal conductivity. According to exemplary embodiments, each of the multiple separators may include a flame-retardant material, such as ceramic and coated glass material. According to exemplary embodiments, the multiple separators 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 module frame (140) may include a bottom plate (141), side plates (142) and a top plate (143).

[0081] The bottom plate (141) can support the battery cells (131) from the bottom in the Z direction. The bottom plate (141) can be substantially parallel to the base plate (111). The top plate (143) can be substantially parallel to the base plate (111). The top plate (143) can be spaced apart from the bottom plate (141) in the Z direction.

[0082] Side plates (142) may be interposed between the bottom plate (141) and the top plate (143). Side plates (142) may be on the edge of the bottom plate (141). Side plates (142) may be connected to the bottom plate (141). Side plates (142) may be connected to the top plate (143). Side plates (142) may be substantially perpendicular to each of the bottom plate (141) and the top plate (143).

[0083] The bottom plate (141) may include a plurality of venting holes (141H). Each of the plurality of venting holes (141H) of the bottom plate (141) may be aligned in the Z direction with a corresponding one among the connecting holes (129H) of the thermal resin layer (129) and a corresponding one among the cooling holes (125H) of the cooling plate (125). Referring to FIGS. 3 and 4, each battery cell (131) may overlap with two venting holes (141H). However, this is not limited thereto, and each battery cell (131) may overlap with one or more than three venting holes (141H). The venting holes (141H) that overlap with each battery cell (131) may be spaced apart along the length direction (Y direction) of each battery cell (131).

[0084]

[0085] Each of the battery modules (130) may include a filler (139). The filler (139) may fill the internal space of the module frame (140). The filler (139) may fill the space between the battery cells (131) and the inner surface of the module frame (140). The filler (139) may fill the internal space of each battery module (130), excluding the venting holes (141H) of each bottom plate (141). As a result, heat or gas generated from the battery cells (131) can be directed to the venting holes (141H). That is, the venting direction of each battery module (130) can be directed downward in the Z direction.

[0086] According to some embodiments, the filler (139) may be configured to be foamed in a liquid or semi-liquid state and to fill the internal space of the module frame (140) by curing after foaming. As a non-limiting example, the filler (139) may include a polymer matrix and a thermal conductive additive. The polymer matrix may include, for example, silicone or polyurethane. The thermal conductive additive may include, for example, aluminum oxide, boron nitride, or carbon-based materials. However, the method of application and the type of material of the filler (139) are not limited thereto.

[0087]

[0088] The lead plate (150) may be located on the upper side of the battery modules (130) in the Z direction. The lead plate (150) may be secured to the side walls (114) by bolting or the like. The lead plate (150) may be substantially parallel to the base plate (111).

[0089] The packing member (147) may be located between each battery module (130) and the lead plate (150). The packing member (147) may be in contact with each battery module (130) and the lead plate (150), respectively. The packing member (147) may be configured to secure each battery module (130). For example, if a shock such as vibration is applied to the battery pack (100), the packing member (147) may be configured to prevent movement of the battery modules (130) and absorb the shock. The packing member (147) may include an elastic material (e.g., rubber, etc.).

[0090] The reinforcing structure (160) may be on the lead plate (150). The reinforcing structure (160) may be a configuration for reinforcing the rigidity of the battery pack (100).

[0091]

[0092] FIGS. 6 and FIGS. 7 are cross-sectional views showing a battery pack (100) in the event of a fire event. FIG. 6 shows a cross-section of the battery pack (100) at position A-A' in FIGS. 1 and FIGS. 2. FIG. 7 shows a cross-section of the battery pack (100) at position B-B' in FIGS. 1 and FIGS. 2.

[0093]

[0094] Referring to FIGS. 6 and 7, if a fire event occurs in one of the battery cells (131) of the battery pack (100), fire byproducts including high-temperature heat, gas, or particles may be generated. The fire byproducts may move to venting passes (123) through venting holes (141H) of the bottom plate (141) of the module frame (140), connecting holes (129H) of the thermal resin layer (129), and holes (125H) of the cooling plate (125). Since the internal space of the battery module (130) is filled with filler (139), the flow of fire byproducts may be guided to the bottom of the battery pack (100) through the venting holes (141H). Since adjacent venting passes (123) in the Y direction are separated from each other by the center beam (112), the flow of fire byproducts between adjacent venting passes (123) in the Y direction can be prevented or delayed.

[0095] The internal pressure of the venting passes (123) may increase due to high-temperature fire byproducts. Due to the increased internal pressure, the base plate (111) may expand. Compared to the lead plate (150) which is equipped with an external reinforcing structure (160), the base plate (111) may expand relatively easily due to the increase in internal pressure of the battery pack (100). The internal pressure of the battery pack (100) may be primarily relieved by the expansion of the base plate (111). At this time, as shown in FIG. 7, one end of each bulkhead (120) may be fixed to the base plate (111) by a weld layer (101), and the other end of each bulkhead (120) may be separated from the cooling plate (125).

[0096] Fire byproducts contained in the venting passes (123) can be introduced into the channels (114C) of the side walls (114). Referring to FIGS. 1 and FIGS. 2 together, the fire byproducts can flow through the channels (114C) and be discharged to the outside of the battery pack (100). By discharging the fire byproducts, the internal temperature and internal pressure of the battery pack (100) can be reduced. Additionally, while the fire byproducts flow through the channels (114C), the temperature of the fire byproducts can be reduced and sparks can be extinguished. Accordingly, a secondary explosion caused by the reaction between the fire byproducts discharged from the battery pack (100) and the outside air can be prevented.

[0097]

[0098] (2nd Example)

[0099] FIG. 8 is a cross-sectional view showing a battery pack (100') in the event of a fire event. FIG. 8 illustrates a cross-section of the battery pack (100') at the position B-B' in FIG. 1 and FIG. 2.

[0100]

[0101] In FIG. 8, the components having the same drawing numbers as FIG. 1 to FIG. 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.

[0102]

[0103] The battery pack (100') of FIG. 8 differs from the battery pack (100) of FIG. 1 to 7 in that, in the event of a fire, one end of each partition (120) is separated from the base plate (111), and the other end of each partition (120) is fixed to the cooling plate (125) by the bonding layer (102).

[0104] Referring to FIG. 4 and FIG. 8 together, in a battery pack (100') in a normal state, one end of each bulkhead (120) may be fixed to a base plate (111) by a bonding layer (101 in FIG. 4), and the other end of each bulkhead (120) may be fixed to a cooling plate (125) by a bonding layer (102). In some embodiments, the bonding force between the bulkheads (120) and the cooling plate (125) by the bonding layer (102) may be greater than the bonding force between the bulkheads (120) and the base plate (111) by the bonding layer (101). For example, the bonding layer (101) may be an adhesive layer, and the bonding layer (102) may be a welding layer. When the internal pressure of the venting passes (123) increases, the base plate (111) may expand downward. Along with this, one end of the bulkheads (120) that were fixed to the base plate (111) by the bonding layer (101) can be separated from the base plate (111).

[0105]

[0106] (3rd Example)

[0107] FIG. 9 is a top view showing a pack housing (110) according to exemplary embodiments. FIG. 10 is a cross-sectional view showing a battery pack (100) according to exemplary embodiments. FIG. 10 shows a cross-section of the battery pack (100) at a position corresponding to B-B' in FIG. 1 and FIG. 9.

[0108] In FIGS. 9 and FIGS. 10, the components having the same drawing numbers as 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 third embodiment, which differ from the first embodiment, will be described in detail.

[0109]

[0110] Referring to FIGS. 9 and 10, each venting pass (123") may overlap with two battery cells (131) in the Z direction. However, this is not limited thereto, and each venting cell (123") may overlap with three or more battery cells (131) in the Z direction.

[0111] The battery cells (131) can be connected to the venting passes (123) by holes (141H", 129H", 125H"). Each of the holes (141H") of the bottom plate (141) can overlap with two battery cells (131) in the Z direction. Each of the connecting holes (129H") of the thermal resin layer (129) can overlap with two battery cells (131) in the Z direction. Each of the holes (125H") of the cooling plate (125) can overlap with two battery cells (131) in the Z direction. The holes (141H", 129H", 125H") can be aligned with each other in the Z direction.

[0112]

[0113] 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; Side walls on the edge of the base plate; A plurality of bulkheads defining venting paths on the base plate; Cooling plates on the plurality of bulkheads above; Battery module on the above cooling plate; and It includes a lead plate that is on the battery module and connected to the side walls, and The above battery module is, A module frame comprising a bottom plate including venting holes, side plates perpendicular to the bottom plate, and a top plate on the side plates; A plurality of battery cells inside the module frame; and A battery pack comprising a filler that fills the internal space of the module frame.

2. In Paragraph 1, A battery pack characterized in that each of the above-mentioned venting holes overlaps in a vertical direction with a corresponding one of the above-mentioned battery cells.

3. In Paragraph 1, A battery pack characterized in that the cooling plate includes cooling holes that overlap in a vertical direction with a corresponding one of the venting holes.

4. In Paragraph 3, A battery pack characterized in that the battery cells are in communication with the venting passes through the venting holes and the cooling holes.

5. In Paragraph 1, A battery pack characterized in that each of the above-mentioned battery cells overlaps in a vertical direction with two or more of the above-mentioned venting holes.

6. In Paragraph 1, A battery pack characterized by further including a thermal resin layer between the battery module and the cooling plate.

7. In Paragraph 1, A battery pack characterized in that the plurality of partitions are spaced apart from each other in a first direction.

8. In Paragraph 7, It further includes a center beam extending in the first direction on the base plate, and A battery pack characterized in that each of the plurality of partitions extends in a second direction perpendicular to the first direction between the side wall and the center beam, and is spaced apart from each of the side wall and the center beam.

9. In Paragraph 1, A battery pack characterized in that each of the above-mentioned venting passes overlaps in a vertical direction with a corresponding one of the plurality of battery cells.

10. In Paragraph 1, A battery pack characterized in that each of the above-mentioned venting passes overlaps in a vertical direction with two or more corresponding of the plurality of battery cells.

11. In Paragraph 1, A first bonding layer between each of the above bulkheads and the base plate; and A battery pack characterized by further including a second bonding layer between each of the above bulkheads and the cooling plate.

12. In Paragraph 11, A battery pack characterized in that the magnitude of the bonding force of each of the bulkheads to the base plate by the first bonding layer is different from the magnitude of the bonding force of each of the bulkheads to the cooling plate by the second bonding layer.

13. In Paragraph 11, A battery pack characterized in that the first bonding layer is a welding layer and the second bonding layer is an adhesive layer.

14. In Paragraph 11, A battery pack characterized in that the first bonding layer is an adhesive layer and the second bonding layer is a welding layer.

15. In Paragraph 1, It further includes channels embedded in the above side walls, and A battery pack characterized in that one end of each of the above channels is connected to the venting passes, and the other end of each of the above channels is configured to communicate with the outside of the battery pack.

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