Pack housing, battery pack comprising same, method for cooling battery pack, and vehicle comprising same

Abstract

According to exemplary embodiments of the present invention, a pack housing is provided. The pack housing comprises: a base plate which intersects a first direction; a cooling channel which is in the base plate and includes a sub-flow path and a main flow path for supplying cooling water to the sub-flow path; and a blocking member which is inside the sub-flow path, wherein the blocking member may include a bimetal part comprising a first metal and a second metal which are arranged in a second direction that intersects the first direction and which have different coefficients of thermal expansion.

Description

Pack housing, battery pack including same, cooling method for battery pack, and vehicle including same

[0001] The present invention relates to a pack housing, a battery pack including the same, a cooling method for the battery pack, and a vehicle including the same. This application claims the benefit of Korean Application No. 10-2024-0122525, filed September 9, 2024, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological development trend for secondary batteries for mobility is improving energy density and safety. The safety of secondary batteries for mobility is crucial, as it directly impacts the lives of passengers. Safety in secondary batteries can be achieved through mechanical robustness, reliable electrical insulation, and delayed heat transfer in the event of thermal runaway.

[0004] The technical idea of ​​the present invention aims to solve a problem by providing a pack housing with enhanced safety.

[0005] The technical idea of ​​the present invention is to provide a pack housing with improved performance and reliability.

[0006] The technical idea of ​​the present invention aims to solve a problem by providing a battery pack with improved safety.

[0007] The technical idea of ​​the present invention aims to solve a problem by providing a battery pack with improved performance and reliability.

[0008] The technical idea of ​​the present invention is to provide a method for cooling a battery pack with improved safety.

[0009] The technical idea of ​​the present invention is to provide a method for cooling a battery pack with improved performance and reliability.

[0010] The problem that the technical idea of ​​the present invention seeks to solve is to provide a vehicle with improved safety.

[0011] The technical idea of ​​the present invention aims to solve a problem by providing a vehicle with improved performance and reliability.

[0012] According to exemplary embodiments of the present invention for solving the above-described problem, a pack housing is provided. The pack housing includes: a base plate intersecting a first direction; a cooling channel within the base plate, the cooling channel including a sub-channel and a main channel for supplying cooling water to the sub-channel; and a blocking member within the sub-channel, wherein the blocking member may include a bimetallic portion including a first metal and a second metal having different coefficients of thermal expansion and arranged in a second direction intersecting the first direction.

[0013] When a thermal runaway event occurs in the battery cell assembly overlapping the sub-euro and the first direction, the blocking member may be configured to close the sub-euro.

[0014] The above-described blocking member includes a first state at a first temperature and a second state at a second temperature, the second temperature being higher than the first temperature, and a length of the bimetallic portion in the second direction in the second state may be greater than a length in the second direction in the first state.

[0015] The blocking member includes a first state at a first temperature and a second state at a second temperature, the second temperature being higher than the first temperature, and in the first state, the sub-flow path is connected to the main flow path, and in the second state, the sub-flow path can be blocked from the main flow path.

[0016] In the first state, the cooling water may be supplied to the sub-channel, and in the second state, the cooling water may not be supplied to the sub-channel.

[0017] The above blocking member further includes a fixing portion and a plug portion, and when the temperature of the battery cell assembly overlapping the sub-euro in the first direction increases, the relative position of the plug portion with respect to the fixing portion can move in the second direction.

[0018] The sub-euro further includes a connection portion with the main euro, and the blocking member is disposed within the connection portion, and when the temperature of the battery cell assembly rises, the plug portion may be configured to contact an inner wall of the connection portion to close the sub-euro.

[0019] The blocking member includes a first state at a first temperature and a second state at a second temperature, the second temperature being higher than the first temperature, the sub-channel further includes a connection portion with the main channel, and the blocking member is disposed within the connection portion, and in the first state, the cooling water flows into the sub-channel through the connection portion, and in the second state, the blocking member can block movement of the cooling water through the connection portion.

[0020] The bimetallic portion includes a first layer and a second layer each including the first metal and the second metal, and the second metal of the first layer and the second metal of the second layer can be arranged in a row in the second direction.

[0021] According to exemplary embodiments of the present invention for solving the above-described problem, a battery pack is provided. The battery pack includes a pack housing including a base plate; a cooling channel within the base plate including a first sub-channel and a main channel for supplying coolant to the first sub-channel; a first battery cell assembly on the base plate overlapping the first sub-channel in a first direction; and a blocking member positioned within the first sub-channel, wherein the first battery cell assembly includes a first state at a first temperature and a second state at a second temperature, the second temperature being higher than the first temperature, and the blocking member includes a bimetallic portion including a first metal and a second metal having different coefficients of thermal expansion and arranged in a second direction intersecting the first direction, wherein in the second state of the first battery cell assembly, the blocking member may be configured to close the first sub-channel.

[0022] In the first state, the first sub-euro is connected to the main euro, and in the second state, the first sub-euro can be blocked from the main euro.

[0023] The cooling channel further includes a second sub-channel, and further includes a second battery cell assembly overlapping the second sub-channel in the first direction, wherein in the first state, the main channel is connected to each of the first sub-channel and the second sub-channel, such that the first sub-channel communicates with the second sub-channel through the main channel, and in the second state, the first sub-channel can be blocked from the second sub-channel.

[0024] In the first state, the coolant is supplied from the main flow path to the first sub-flow path, and then from the first sub-flow path to the second sub-flow path through the main flow path, and in the second state, the coolant can be supplied from the main flow path to the second sub-flow path without passing through the first sub-flow path.

[0025] The first state may be a normal state of the first battery cell assembly, and the second state may be a thermal runaway state of the first battery cell assembly.

[0026] According to exemplary embodiments of the present invention, the pack housing may include a blocking member positioned within the sub-channel. The blocking member may include a bimetallic member that expands in one direction when a thermal runaway event occurs in the battery cell assembly, thereby closing the sub-channel. By preventing coolant from flowing into the sub-channel under the battery cell assembly where the thermal runaway event has occurred, the cooling performance of the coolant may be maintained for a longer period of time.

[0027] According to exemplary embodiments of the present invention, a pack housing with enhanced safety can be provided.

[0028] According to exemplary embodiments of the present invention, a pack housing with improved performance and reliability can be provided.

[0029] According to exemplary embodiments of the present invention, a battery pack with enhanced safety can be provided.

[0030] According to exemplary embodiments of the present invention, a battery pack with improved performance and reliability can be provided.

[0031] According to exemplary embodiments of the present invention, a method for cooling a battery pack with improved safety can be provided.

[0032] According to exemplary embodiments of the present invention, a method for cooling a battery pack with improved performance and reliability can be provided.

[0033] According to exemplary embodiments of the present invention, a vehicle with enhanced safety can be provided.

[0034] According to exemplary embodiments of the present invention, a vehicle with improved performance and reliability can be provided.

[0035] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing 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.

[0036] FIG. 1 is a plan view schematically illustrating a battery pack according to exemplary embodiments according to the technical idea of ​​the present invention.

[0037] FIG. 2 is a plan view schematically illustrating a cooling channel of a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0038] FIG. 3 is a plan view illustrating a blocking member of a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0039] FIG. 4 is a plan view illustrating a blocking member of a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0040] FIG. 5 is a plan view illustrating a blocking member of a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0041] FIG. 6 is a plan view illustrating a blocking member of a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0042] FIG. 7 is a plan view illustrating a pack housing according to exemplary embodiments according to the technical idea of ​​the present invention.

[0043] FIG. 8 is a plan view illustrating a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0044] FIG. 9 is a plan view illustrating a pack housing according to exemplary embodiments of the technical idea of ​​the present invention.

[0045] FIG. 10 is a flowchart illustrating a method for cooling a battery pack according to exemplary embodiments of the technical idea of ​​the present invention.

[0046] FIG. 11 is a schematic drawing of a vehicle including a battery pack according to exemplary embodiments of the technical idea of ​​the present invention.

[0047] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0048] Accordingly, 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. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0049] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0050] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0051]

[0052] (Example 1)

[0053] FIG. 1 is a plan view schematically illustrating a battery pack (100) according to exemplary embodiments of the technical idea of ​​the present invention.

[0054] Referring to FIG. 1, a battery pack (100) may include a pack housing (110) and a plurality of battery cell assemblies (120). The battery pack (100) may be a final product mounted in an application such as a vehicle.

[0055] The pack housing (110) may provide a space for mounting battery cell assemblies (120). The pack housing (110) may include a base plate (111), side walls (112, 113, 114, 115), a center beam (116), and cross beams (117).

[0056] Here, the first direction (D1) and the second direction (D2) may be substantially parallel to the mounting surface of the base plate (111) (i.e., the surface facing the battery cell assembly (120)), and the third direction (D3) may be substantially perpendicular to the mounting surface of the base plate (111).

[0057] The side walls (112, 113, 114, 115) may be substantially perpendicular to the base plate (111). The side walls (112, 113) may extend in a first direction (D1). The side walls (114, 115) may extend in a second direction (D2).

[0058] The center beam (116) can extend in a first direction (D1). The center beam (116) can be interposed between the side walls (112, 113). The cross beams (117) can extend in a second direction (D2). The cross beams (117) can be interposed between the side walls (114, 115).

[0059] A plurality of battery cell assemblies (120) may be arranged on a base plate (111) of a pack housing (110). The base plate (111) may support the plurality of battery cell assemblies (120). Side walls (112, 113, 114, 115) may horizontally surround the plurality of battery cell assemblies (120). The side walls (112, 113, 114, 115) may protect the plurality of battery cell assemblies (120). The plurality of battery cell assemblies (120) may be arranged in a space defined by cross beams (117) on the base plate (111).

[0060] The battery cell assembly (120) may further include a plurality of battery cells arranged in a first direction (D1) and pads arranged between the plurality of battery cells. The pads are arranged between the plurality of battery cells in the first direction (D1) and may overlap the plurality of battery cells in the first direction (D1).

[0061] The pad can absorb the swelling of multiple battery cells. The pad may contain a compressible material. The pad may contain polyurethane (PU). The pad may also contain a refractory material.

[0062] The battery pack (100) may further include a pack lead coupled to side walls (112, 113, 114, 115) of the pack housing (110). The pack lead may cover elements mounted inside the battery pack (100), such as a plurality of battery cell assemblies (120) and electrical components. The pack lead may be fixed to the pack housing (110) by a mechanical coupling means, such as bolting.

[0063] In FIG. 1, the arrangement of the plurality of battery cell assemblies (120) may be referred to as a 3 * 2 arrangement. For example, the plurality of battery cell assemblies (120) may include a first battery cell assembly (120A), a second battery cell assembly (120B), a third battery cell assembly (120C), a fourth battery cell assembly (120D), a fifth battery cell assembly (120E), and a sixth battery cell assembly (120F) arranged in a 3 * 2 arrangement. The arrangement of the plurality of battery cell assemblies (120) disclosed in FIG. 1 is a non-limiting example and does not limit the technical idea of ​​the present invention in any sense. A person of ordinary skill in the art will be able to easily arrive at a plurality of battery cell assemblies (120) arranged in an M * N arrangement (wherein, M and N are each integers greater than or equal to 2) based on the description herein.

[0064] The battery pack (100) may further include a Battery Management System (BMS). The BMS may be configured to monitor, balance, and control the battery pack (100). Monitoring of the battery pack (100) may include measuring voltage and current of specific nodes within a plurality of battery cell assemblies (120) and measuring temperature of set locations within the battery pack (100). The battery pack (100) may include measuring instruments for measuring the voltage, current, and temperature described above.

[0065] Balancing of a battery pack (100) is an operation that reduces the deviation between multiple battery cell assemblies (120). Control of the battery pack (100) includes preventing overcharge, overdischarge, and overcurrent. Through monitoring, balancing, and control, the battery pack (100) can operate under optimal conditions, thereby preventing shortening of the lifespan of each of the multiple battery cell assemblies (120).

[0066] The battery pack (100) may further include additional electrical components, such as a cooling device, a PRA (Power Relay Assembly), and a safety plug. The cooling device may include a cooling fan. The cooling fan may prevent overheating of each of the plurality of 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 may protect the plurality of 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 a situation where an abnormal voltage, such as a voltage surge, occurs. Additional electrical components may be interposed between the plurality of battery cell assemblies (120) and the sidewall (115). The space between the battery cell assemblies (120) and the sidewall (115) may also be referred to as an electrical component mounting area.

[0067] The battery pack (100) may further include a plurality of inter-busbars configured to electrically connect a plurality of battery cell assemblies (120). The plurality of battery cell assemblies (120) may be connected in series by the plurality of inter-busbars. Accordingly, the battery pack (100) may be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0068]

[0069] (Example 2)

[0070] FIG. 2 is a plan view schematically illustrating a cooling channel (130) of a pack housing (110) according to exemplary embodiments of the technical idea of ​​the present invention.

[0071] Referring to FIGS. 1 and 2 together, the base plate (111) of the pack housing (110) may include a first region (111A) to a sixth region (111F). The first region (111A) to the sixth region (111F) of the base plate (111) are regions below the first battery cell assembly (120A) to the sixth battery cell assembly (120F), respectively, and may correspond to the first battery cell assembly (120A) to the sixth battery cell assembly (120F), respectively. For example, the first battery cell assembly (120A) may be disposed on the first region (111A) of the base plate (111), and the first region (111A) may overlap the first battery cell assembly (120A) in a third direction (D3). A second battery cell assembly (120B) is disposed on a second region (111B) of a base plate (111), and the second region (111B) can overlap with the second battery cell assembly (120B) in a third direction (D3). A third battery cell assembly (120C) is disposed on a third region (111C) of the base plate (111), and the third region (111C) can overlap with the third battery cell assembly (120C) in a third direction (D3). A fourth battery cell assembly (120D) is disposed on a fourth region (111D) of the base plate (111), and the fourth region (111D) can overlap with the fourth battery cell assembly (120D) in a third direction (D3). A fifth battery cell assembly (120E) is disposed on a fifth region (111E) of a base plate (111), and the fifth region (111E) can overlap with the fifth battery cell assembly (120E) in a third direction (D3). A sixth battery cell assembly (120F) is disposed on a sixth region (111F) of a base plate (111), and the sixth region (111F) can overlap with the sixth battery cell assembly (120F) in a third direction (D3).

[0072] A cooling channel (130) may be arranged within the base plate (111). The cooling channel (130) may include a first sub-channel (135A) to a sixth sub-channel (135F). The first sub-channel (135A) to the sixth sub-channel (135F) are arranged in a first region (111A) to a sixth region (111F) of the base plate (111), respectively, and may correspond to a first battery cell assembly (120A) to a sixth battery cell assembly (120F). For example, the first sub-channel (135A) may be arranged under the first battery cell assembly (120A), overlap with the first battery cell assembly (120A) in a third direction (D3), and cool the first battery cell assembly (120A). The second sub-flow path (135B) is disposed under the second battery cell assembly (120B), overlaps with the second battery cell assembly (120B) in a third direction (D3), and can cool the second battery cell assembly (120B). The third sub-flow path (135C) is disposed under the third battery cell assembly (120C), overlaps with the third battery cell assembly (120C) in a third direction (D3), and can cool the third battery cell assembly (120C). The fourth sub-flow path (135D) is disposed under the fourth battery cell assembly (120D), overlaps with the fourth battery cell assembly (120D) in a third direction (D3), and can cool the fourth battery cell assembly (120D). The fifth sub-flow (135E) is arranged under the fifth battery cell assembly (120E), overlaps with the fifth battery cell assembly (120E) in a third direction (D3), and can cool the fifth battery cell assembly (120E). The sixth sub-flow (135F) is arranged under the sixth battery cell assembly (120F), overlaps with the sixth battery cell assembly (120F) in a third direction (D3), and can cool the sixth battery cell assembly (120F).

[0073] The cooling channel (130) may further include a first main channel (131) that supplies cooling water to the first sub-channel (135A), the second sub-channel (135B), and the third sub-channel (135C). The first main channel (131) may be connected to each of the first sub-channel (135A), the second sub-channel (135B), and the third sub-channel (135C).

[0074] The cooling channel (130) may further include a second main channel (132) that supplies cooling water to the fourth sub-channel (135D), the fifth sub-channel (135E), and the sixth sub-channel (135F). The second main channel (132) may be connected to each of the fourth sub-channel (135D), the fifth sub-channel (135E), and the sixth sub-channel (135F). The second main channel (132) may be connected to the first main channel (131).

[0075] The cooling channel (130) may further include an inlet (133) and an outlet (134). The inlet (133) may be connected to a cooling water storage tank and may supply cooling water to the first main passage (131) and the second main passage (132). The outlet (134) may discharge the cooling water that has passed through the first main passage (131) and the second main passage (132) from the cooling channel (130).

[0076] A blocking member may be placed within the first sub-channel (135A) to the sixth sub-channel (135F) of the cooling channel (130) to close it from the main channel (131, 132). Hereinafter, the blocking member (40) within the first sub-channel (135A) will be described as an example with reference to FIGS. 3 and 4.

[0077]

[0078] FIG. 3 is a plan view illustrating a blocking member (40) of a pack housing (110) according to exemplary embodiments according to the technical idea of ​​the present invention. Specifically, FIG. 3 is an enlarged view of the EX1 area of ​​FIG. 2, illustrating the blocking member (40) in a first state (S1).

[0079] FIG. 4 is a plan view illustrating a blocking member (40) of a pack housing (110) according to exemplary embodiments according to the technical idea of ​​the present invention. Specifically, FIG. 4 is an enlarged view of the EX1 area of ​​FIG. 2, illustrating the blocking member (40) in a second state (S2).

[0080] Referring to FIGS. 1, 3, and 4 together, a blocking member (40) may be positioned within the first sub-channel (135A). The blocking member (40) may be configured to close the first sub-channel (135A) when a thermal runaway event of the first battery cell assembly (120A) occurs.

[0081] The blocking member (40) may include a bimetallic portion (45), a fixed portion (46), and a plug portion (47). The fixed portion (46) may be a portion fixed on a wall within the first sub-channel (135A). The plug portion (47) may be a portion positioned on the bimetallic portion (45) and having a position that changes as the length of the bimetallic portion (45) changes.

[0082] The bimetallic portion (45) may include a first metal and a second metal having different thermal expansion coefficients. For example, the thermal expansion coefficient of the first metal may be greater than the thermal expansion coefficient of the second metal. Specifically, the bimetallic portion (45) may include a first layer (41) and a second layer (42) each including a first metal and a second metal. The first layer (41) may include a first metal layer (41a) and a second metal layer (41b). The second layer (42) may include a first metal layer (42a) and a second metal layer (42b). The second metal layer (41b) of the first layer (41) and the second metal layer (42b) of the second layer (42) may be arranged in series. For example, the second metal layer (41b) of the first layer (41) and the second metal layer (42b) of the second layer (42) may be arranged in contact with each other in the first state (S1). The first metal layer (41a) of the first layer (41) and the first metal layer (42a) of the second layer (42) may be arranged spaced apart from each other with the second metal layer (41b) and the second metal layer (42b) therebetween. In FIGS. 3 and 4, the bimetal part (45) is exemplified as including one first layer (41) and one second layer (42), but it is to be understood that the bimetal part (45) according to the technical idea of ​​the present invention may include more first layers (41) and second layers (42).

[0083] The first layer (41) and the second layer (42) may be arranged in the second direction (D2). The first metal layer (41a) and the second metal layer (41b) of the first layer (41) may be arranged in the second direction (D2). The first metal layer (42a) and the second metal layer (42b) of the second layer (42) may be arranged in the second direction (D2).

[0084] Specifically, the blocking member (40) may be disposed at the boundary between the first sub-channel (135A) and the first main channel (131). For example, the first sub-channel (135A) may include two portions connected to the first main channel (131), and the blocking member (40) may be disposed within the two portions. For example, the first sub-channel (135A) may include an inlet portion through which coolant flows into the first sub-channel (135A) and an outlet portion through which coolant flows out from the first sub-channel (135A), and the blocking member (40) may be disposed at the boundary between the two portions.

[0085] In the first state (S1) as illustrated in FIG. 3, the first battery cell assembly (120A) may be in a normal state in which no thermal runaway event has occurred. In the first state (S1), the temperature of the first battery cell assembly (120A) may be a first temperature. For example, the first temperature may be less than 100°C. For example, the first temperature may be less than 60°C.

[0086] In the first state (S1), the blocking member (40) may be in a non-expanded state. Specifically, the bimetallic portion (45) may be in a non-expanded state. For example, the first layer (41) and the second layer (42) of the bimetallic portion (45) may have a form in which they are joined by being in contact with each other in the second direction (D2). In the first state (S1), the length of the bimetallic portion (45) in the second direction (D2) may be a first length (L1). In the first state (S1), the blocking member (40) may not block the first sub-channel (135A). Specifically, in the first state (S1), the blocking member (40) may not block the first sub-channel (135A) from the first main channel (131). In the first state (S1), the first sub-channel (135A) may be connected to the first main channel (131).

[0087] For example, the first sub-channel (135A) may include a connection portion (135A_C) with the first main channel (131). A blocking member (40) may be positioned within the connection portion (135A_C). In the first state (S1), the blocking member (40) may not completely block the connection portion (135A_C) but may leave an empty space. Through the empty space, the cooling water supplied from the first main channel (131) may flow into the first sub-channel (135A).

[0088] In the second state (S2) as illustrated in FIG. 4, the first battery cell assembly (120A) may be in a state where a thermal runaway event has occurred. In the second state (S2), the temperature of the first battery cell assembly (120A) may be a second temperature. The second temperature may be higher than the first temperature of the first state (S1). For example, the second temperature may be 100°C or higher.

[0089] In the second state (S2), the blocking member (40) can expand in the second direction (D2). Specifically, the bimetallic portion (45) can expand in the second direction (D2). For example, as the temperature of the first battery cell assembly (120A) rises, the temperatures of the first region (111A) and the first sub-channel (135A) can rise, and the bimetallic portion (45) can expand and bend toward the first metal having a large coefficient of thermal expansion. For example, the first layer (41) can be convexly bent toward the first metal layer (41a), and the second layer (42) can be convexly bent toward the first metal layer (42a). As the first layer (41) and the second layer (42) are convexly bent in different directions and undergo shape deformation, displacement can occur. The bimetallic portion (45) can expand in the second direction (D2) by a distance equal to the sum of the displacement of the first layer (41) and the displacement of the second layer (42).

[0090] In the second state (S2), the length of the bimetallic portion (45) in the second direction (D2) may be a second length (L2). For example, the second length (L2) of the bimetallic portion (45) in the second direction (D2) in the second state (S2) may be greater than the first length (L1) in the second direction (D2) in the first state (S1). For example, the length of the blocking member (40) in the second direction (D2) in the second state (S2) may be greater than the length in the second direction (D2) in the first state (S1).

[0091] In the second state (S2), the first sub-channel (135A) may be blocked as the blocking member (40) expands in the second direction (D2). Specifically, in the second state (S2), the blocking member (40) may block the first sub-channel (135A) from the first main channel (131). In the second state (S2), the first sub-channel (135A) may not be connected to the first main channel (131). In the second state (S2), the first sub-channel (135A) may be closed.

[0092] For example, the blocking member (40) can block the connection portion (135A_C) in one direction by expanding in the second direction (D2) within the connection portion (135A_C). The blocking member (40) can block the connection portion (135A_C) by expanding from one inner wall toward the other inner wall within the connection portion (135A_C). In the present specification, blocking the connection portion (135A_C) may mean blocking a passage so that a material (e.g., coolant) cannot move through the connection portion (135A_C), even if the connection portion (135A_C) is not blocked so that there is no empty space therein.

[0093] Specifically, as the bimetallic portion (45) of the blocking member (40) expands in the second direction (D2), the position of the plug portion (47) may move in the second direction (D2). For example, the relative position of the plug portion (47) with respect to the fixed portion (46) may move in the second direction (D2). As a result, the plug portion (47) may come into contact with an inner wall of the connection portion (135A_C), thereby closing the first sub-channel (135A). The inflow of coolant may be blocked, so that coolant may not be supplied from the first main channel (131) to the first sub-channel (135A).

[0094]

[0095] As described with reference to FIGS. 3 and 4, a blocking member (40) is arranged within the first sub-flow path (135A), so that when a thermal runaway event of the first battery cell assembly (120A) occurs, the first sub-flow path (135A) is blocked from the first main flow path (131), and the first sub-flow path (135A) can be closed.

[0096] Unlike embodiments according to the technical idea of ​​the present invention, when a thermal runaway event of the first battery cell assembly (120A) occurs, if the first sub-channel (135A) is not blocked from the first main channel (131) and coolant flows into the first sub-channel (135A), the coolant may be heated by heat and flames that may be generated by the thermal runaway event. The coolant heated in this way reaches the end of its cooling life and cannot cool other battery cell assemblies (e.g., the second battery cell assembly to the fifth battery cell assemblies (120B to 120F)).

[0097] According to embodiments of the technical idea of ​​the present invention, when the blocking member (40) expands and closes the first sub-channel (135A), the cooling performance of the coolant can be maintained for a longer period of time, and thus other battery cell assemblies (e.g., the second battery cell assembly to the fifth battery cell assembly (120B to 120F)) can still be cooled. According to embodiments of the technical idea of ​​the present invention, the life of the coolant can be extended.

[0098]

[0099] Referring again to FIG. 2, blocking members are also arranged within the second sub-flow (135B) to the sixth sub-flow (135F), so that when a thermal runaway event occurs in the second battery cell assembly (120B) to the sixth battery cell assembly (120F), the second sub-flow (135B) to the sixth sub-flow (135F) can be closed, respectively.

[0100]

[0101] According to embodiments of the technical idea of ​​the present invention, even without a separate control device or control signal, the blocking member can naturally expand due to a temperature rise within the sub-flow path, thereby blocking the sub-flow path from the main flow path. Therefore, even in a thermal runaway event situation where a problem occurs in the control device or the control signal is not transmitted normally, the sub-flow path can be blocked from the main flow path. As a result, it is expected that the performance of the coolant can be maintained and the lifespan of the coolant can be extended even in a thermal runaway event situation.

[0102] By embodiments according to the technical idea of ​​the present invention, a pack housing (110) with improved performance and reliability can be provided.

[0103] By embodiments according to the technical idea of ​​the present invention, a pack housing (110) with improved safety can be provided.

[0104] By embodiments according to the technical idea of ​​the present invention, a battery pack (100) including a pack housing (110) with improved performance and reliability can be provided.

[0105] By embodiments according to the technical idea of ​​the present invention, a battery pack (100) including a pack housing (110) with improved safety can be provided.

[0106]

[0107] (Example 3)

[0108] FIG. 5 is a plan view illustrating a blocking member (50) of a pack housing (110) according to exemplary embodiments according to the technical idea of ​​the present invention. Specifically, FIG. 5 is an enlarged view of the EX1 area of ​​FIG. 2, illustrating the blocking member (50) in a first state (S1).

[0109] Fig. 6 is a plan view illustrating a blocking member (50) of a pack housing (110) according to exemplary embodiments according to the technical idea of ​​the present invention. Specifically, Fig. 6 is an enlarged view of the EX1 area of ​​Fig. 2, illustrating the blocking member (50) in a second state (S2).

[0110] Referring to FIGS. 2, 5, and 6 together, a blocking member (50) may be positioned within the first sub-flow path (135A). The blocking member (50) may be configured to close the first sub-flow path (135A) when a thermal runaway event of the first battery cell assembly (120A) occurs. Hereinafter, the differences from the blocking member (40) described with reference to FIGS. 3 and 4 will be primarily described.

[0111] The blocking member (50) may include a bimetallic portion (55), a fixing portion (56), and a plug portion (57). The bimetallic portion (55) may include a first metal and a second metal having different thermal expansion coefficients. For example, the thermal expansion coefficient of the first metal may be greater than the thermal expansion coefficient of the second metal. The bimetallic portion (55) may include a first layer (51) composed of a first metal layer (51a) and a second metal layer (51b), and a second layer (52) composed of a first metal layer (52a) and a second metal layer (52b). The second metal layer (51b) of the first layer (51) and the second metal layer (52b) of the second layer (52) may be arranged in series. For example, the second metal layer (51b) of the first layer (51) and the second metal layer (52b) of the second layer (52) can be placed in contact with each other.

[0112] The first layer (51) and the second layer (52) may be arranged in the first direction (D1). The first metal layer (51a) and the second metal layer (51b) of the first layer (51) may be arranged in the first direction (D1). The first metal layer (52a) and the second metal layer (52b) of the second layer (52) may be arranged in the first direction (D1).

[0113] Specifically, the blocking member (50) may be disposed at the boundary between the first sub-channel (135A) and the first main channel (131). For example, the first sub-channel (135A) may include two portions connected to the first main channel (131), and the blocking member (50) may be disposed within the two portions. For example, the first sub-channel (135A) may include a boundary where coolant flows into the first sub-channel (135A) and a boundary where coolant flows out from the first sub-channel (135A), and the blocking member (50) may be disposed at the two boundaries.

[0114] In the first state (S1) as illustrated in FIG. 5, the first battery cell assembly (120A) may be in a normal state in which no thermal runaway event has occurred. In the first state (S1), the temperature of the first battery cell assembly (120A) may be a first temperature. For example, the first temperature may be less than 100°C. For example, the first temperature may be less than 60°C.

[0115] In the first state (S1), the blocking member (50) may be in a non-expanded state. Specifically, the bimetallic portion (55) may be in a non-expanded state. In the first state (S1), the length of the bimetallic portion (55) in the first direction (D1) may be a third length (L3). In the first state (S1), the blocking member (50) may not block the first sub-channel (135A). Specifically, in the first state (S1), the blocking member (50) may not block the first sub-channel (135A) from the first main channel (131). In the first state (S1), the first sub-channel (135A) may be connected to the first main channel (131).

[0116] For example, the first sub-channel (135A) may include a connection portion (135A_C) with the first main channel (131). A blocking member (50) may be positioned within the connection portion (135A_C). In the first state (S1), the blocking member (50) may not completely block the connection portion (135A_C) but may leave an empty space. Cooling water supplied from the first main channel (131) may flow into the first sub-channel (135A) through the empty space.

[0117] In the second state (S2) as illustrated in FIG. 6, the first battery cell assembly (120A) may be in a state where a thermal runaway event has occurred. In the second state (S2), the temperature of the first battery cell assembly (120A) may be a second temperature. The second temperature may be higher than the first temperature. For example, the second temperature may be 100°C or higher.

[0118] In the second state (S2), the blocking member (50) can expand in the first direction (D1). Specifically, the bimetallic portion (55) can expand in the first direction (D1). For example, as the temperature of the first battery cell assembly (120A) increases, the temperature within the first sub-channel (135A) can increase, and the bimetallic portion (55) can expand.

[0119] In the second state (S2), the length of the bimetallic portion (55) in the first direction (D1) may be a fourth length (L4). For example, the fourth length (L4) of the bimetallic portion (55) in the second state (S2) in the first direction (D1) may be greater than the third length (L3) of the bimetallic portion (55) in the first direction (D1) in the first state (S1). For example, the length of the blocking member (50) in the first direction (D1) in the second state (S2) may be greater than the length of the blocking member (50) in the first direction (D1) in the first state (S1).

[0120] In the second state (S2), the first sub-channel (135A) may be blocked as the blocking member (50) expands in the first direction (D1). Specifically, in the second state (S2), the blocking member (50) may block the first sub-channel (135A) from the first main channel (131). In the second state (S2), the first sub-channel (135A) may not be connected to the first main channel (131). In the second state (S2), the first sub-channel (135A) may be closed.

[0121] For example, the blocking member (50) can block the connection portion (135A_C) in one direction by expanding in the first direction (D1) within the connection portion (135A_C). The blocking member (50) can expand from one inner wall toward the other inner wall within the connection portion (135A_C) to block the connection portion (135A_C). For example, the blocking member (50) can block a passage through which coolant can pass within the connection portion (135A_C). As a result, the inflow of coolant is blocked by the blocking member (50), so that coolant may not be supplied from the first main passage (131) to the first sub passage (135A).

[0122] By embodiments according to the technical idea of ​​the present invention, a pack housing (110) with improved performance and reliability can be provided.

[0123] By embodiments according to the technical idea of ​​the present invention, a pack housing (110) with improved safety can be provided.

[0124] By embodiments according to the technical idea of ​​the present invention, a battery pack (100) including a pack housing (110) with improved performance and reliability can be provided.

[0125] By embodiments according to the technical idea of ​​the present invention, a battery pack (100) including a pack housing (110) with improved safety can be provided.

[0126]

[0127] (Example 4)

[0128] FIG. 7 is a plan view illustrating a battery pack (100) according to exemplary embodiments of the technical idea of ​​the present invention. Specifically, FIG. 7 is an enlarged view of the EX2 area of ​​FIG. 2, and is intended to illustrate the battery pack (100) in the first state (S11).

[0129] FIG. 8 is a plan view illustrating a battery pack (100) according to exemplary embodiments of the technical idea of ​​the present invention. Specifically, FIG. 8 is an enlarged view of the EX2 area of ​​FIG. 2, and is intended to illustrate the battery pack (100) in the second state (S12).

[0130] FIG. 9 is a plan view illustrating a battery pack (100) according to exemplary embodiments of the technical idea of ​​the present invention. Specifically, FIG. 9 is an enlarged view of the EX2 area of ​​FIG. 2, and is intended to illustrate the battery pack (100) in the third state (S13).

[0131] Referring to FIGS. 1, 2, and 7 together, in a first state (S11), the first battery cell assembly (120A), the second battery cell assembly (120B), and the third battery cell assembly (120C) of the battery pack (100) may be in a normal state in which a thermal runaway event has not occurred. In the first state (S11), the temperatures of the first battery cell assembly (120A), the second battery cell assembly (120B), and the third battery cell assembly (120C) may be a first temperature. For example, the first temperature may be less than 100°C. For example, the first temperature may be less than 60°C.

[0132] A blocking member may be placed within each of the first sub-flow (135A), the second sub-flow (135B), and the third sub-flow (135C). For example, a blocking member (40) including a bimetallic portion (45) may be placed as illustrated in FIGS. 3 and 4 . A blocking member (50) including a bimetallic portion (55) may be placed as illustrated in FIGS. 5 and 6 .

[0133] In the first state (S11), the blocking member including the bimetallic portions respectively arranged in the first sub-flow path (135A), the second sub-flow path (135B), and the third sub-flow path (135C) may be in an unexpanded state. Similarly to what was described with reference to FIG. 3 or FIG. 5, the first sub-flow path (135A), the second sub-flow path (135B), and the third sub-flow path (135C) may not be blocked from the first main flow path (131), but may be connected to the first main flow path (131).

[0134] In the first state (S11), cooling water (138) can be supplied from the first main flow path (131) to the first sub flow path (135A), the second sub flow path (135B), and the third sub flow path (135C). The cooling water (138) can flow into the first sub flow path (135A), the second sub flow path (135B), and the third sub flow path (135C). For example, cooling water is supplied from the first main flow path (131) to the first sub flow path (135A), and the cooling water passing through the first sub flow path (135A) can be supplied to the second sub flow path (135B) through the first main flow path (131). The cooling water passing through the second sub flow path (135B) can be supplied to the third sub flow path (135C) through the first main flow path (131). Cooling water passing through the third sub-flow path (135C) can be supplied back to the first sub-flow path (135A) through the second main flow path (132), etc. In other words, in the first state (S11), the first sub-flow path (135A), the second sub-flow path (135B), and the third sub-flow path (135C) can communicate with each other through the first main flow path (131).

[0135] Referring to FIGS. 1, 2, and 8 together, in the second state (S12), the first battery cell assembly (120A) of the battery pack (100) may be in a state where a thermal runaway event (TR) has occurred. In the second state (S12), the temperature of the first battery cell assembly (120A) may be a second temperature. The second temperature may be higher than the first temperature of the first state (S11). For example, the second temperature may be 100°C or higher.

[0136] In the second state (S12), the blocking member including the bimetallic portion within the first sub-flow path (135A) may be in an expanded state. Similar to what was described with reference to FIG. 4 or FIG. 6, the first sub-flow path (135A) may be blocked from the first main flow path (131). The first sub-flow path (135A) may not be connected to the first main flow path (131).

[0137] In the second state (S12), the cooling water (138) may not be supplied from the first main flow path (131) to the first sub-flow path (135A). The cooling water (138) may not flow into the first sub-flow path (135A). Therefore, the cooling water (138) may not pass through the first sub-flow path (135A) where the temperature has increased.

[0138] For example, as described above, the blocking member (40) may be positioned within the inlet portion through which coolant flows into the first sub-channel (135A) and the outlet portion through which coolant flows out from the first sub-channel (135A). As a result, the first sub-channel (135A) may be blocked from the first main channel (131), thereby preventing coolant (138) from flowing into the first sub-channel (135A).

[0139] At this time, the second battery cell assembly (120B) and the third battery cell assembly (120C) may not be in a state where a thermal runaway event (TR) has occurred, and may be connected to the first main flow path (131) without being blocked from the first main flow path (131), respectively. The coolant (138) may be supplied from the first main flow path (131) to the second sub flow path (135B) without passing through the first sub flow path (135A). Similarly, the coolant (138) may be supplied from the first main flow path (131) to the third sub flow path (135C) without passing through the first sub flow path (135A).

[0140] In the second state (S12), the first sub-euro (135A) can be blocked from the second sub-euro (135B) and the third sub-euro (135C).

[0141] Referring to FIGS. 1, 2, and 9, in the third state (S13), the second battery cell assembly (120B) of the battery pack (100) may be in a state where a thermal runaway event (TR) has occurred.

[0142] Similar to what was described with reference to FIG. 8, the blocking member including the bimetallic portion within the second sub-euro (135B) may be in an expanded state, and by the blocking member, the second sub-euro (135B) may be blocked from the first main euro (131) and may not be connected.

[0143] In the third state (S13), the cooling water (138) may not be supplied from the first main flow path (131) to the second sub flow path (135B). The cooling water (138) may not flow into the second sub flow path (135B). Therefore, the cooling water (138) may not pass through the second sub flow path (135B) where the temperature has increased.

[0144] For example, the blocking member may be positioned within an inlet portion through which coolant flows into the second sub-channel (135B) and an outlet portion through which coolant flows out from the second sub-channel (135B). As a result, the second sub-channel (135B) may be blocked from the first main channel (131), thereby preventing coolant (138) from flowing into the second sub-channel (135B).

[0145] At this time, the first sub-flow path (135A) and the third sub-flow path (135C) under the first battery cell assembly (120A) and the third battery cell assembly (130C) where the thermal runaway event (TR) has not occurred may not be blocked from the first main flow path (131), but may be connected to the first main flow path (131). Cooling water (138) may be supplied from the first main flow path (131) to the first sub-flow path (135A) without passing through the second sub-flow path (135B). Similarly, cooling water (138) may be supplied from the first main flow path (131) to the third sub-flow path (135C) without passing through the second sub-flow path (135B).

[0146] In the third state (S13), the second sub-euro (135B) can be blocked from the first sub-euro (135A) and the third sub-euro (135C).

[0147] According to embodiments of the technical idea of ​​the present invention, when the first sub-channel (135A) is closed when a thermal runaway event (TR) occurs in the first battery cell assembly (120A), the cooling performance of the coolant can be maintained for a longer period of time, and thus other battery cell assemblies (e.g., the second battery cell assembly to the fifth battery cell assembly (120B to 120F)) can still be cooled. In particular, not only the second battery cell assembly (120B) adjacent to the first battery cell assembly (120A) in which the thermal runaway event (TR) occurred, but also the non-adjacent third battery cell assembly (120C) can be cooled.

[0148] Likewise, according to embodiments of the technical idea of ​​the present invention, when the second sub-flow path (135B) is closed when a thermal runaway event (TR) of the second battery cell assembly (120B) occurs, the cooling performance of the coolant can be maintained for a longer period of time, and thus other battery cell assemblies (e.g., the first battery cell assembly, the third battery cell assembly, and the fifth battery cell assemblies (120A, 120C to 120F)) can still be cooled.

[0149] According to embodiments of the technical idea of ​​the present invention, the life of the coolant can be extended.

[0150] According to embodiments of the technical idea of ​​the present invention, even without a separate control device or control signal, the blocking member can naturally expand due to a temperature rise within the sub-flow path, thereby blocking the sub-flow path from the main flow path. Accordingly, even in a thermal runaway event situation where a problem occurs in the control device within the battery pack or the control signal is not transmitted normally, the sub-flow path can be blocked from the main flow path. As a result, it is expected that the performance of the coolant can be maintained and the lifespan of the coolant can be extended even in a thermal runaway event situation.

[0151] By embodiments according to the technical idea of ​​the present invention, a pack housing (110) with improved performance and reliability can be provided.

[0152] By embodiments according to the technical idea of ​​the present invention, a pack housing (110) with improved safety can be provided.

[0153] By embodiments according to the technical idea of ​​the present invention, a battery pack (100) including a pack housing (110) with improved performance and reliability can be provided.

[0154] By embodiments according to the technical idea of ​​the present invention, a battery pack (100) including a pack housing (110) with improved safety can be provided.

[0155]

[0156] (Example 5)

[0157] FIG. 10 is a flowchart for explaining a method (S100) for cooling a battery pack according to exemplary embodiments of the technical idea of ​​the present invention.

[0158] Referring to FIGS. 1, 2, 7 and 8, whether or not the coolant passes through the sub-flow path may vary depending on whether or not the battery cell assembly is in a thermal runaway state.

[0159] First, a step (S110) for determining whether the battery cell assembly is in a thermal runaway state may be performed. In embodiments, the step (S110) for determining whether the battery cell assembly is in a thermal runaway state may not be performed separately. However, depending on whether a thermal runaway state exists, a step (S121) for passing the coolant (138) through the first sub-channel (135A) or a step (S131) ​​for closing the first sub-channel (135A) may be performed.

[0160] The battery cell assembly may include a first state, which is a normal state, and a second state, which is a thermal runaway state. In the first state, the battery cell assembly may be at a first temperature. In the second state, the battery cell assembly may be at a second temperature higher than the first temperature. For example, the first temperature may be less than 100°C. For example, the first temperature may be less than 60°C. For example, the second temperature may be greater than 100°C.

[0161] In the first state, that is, when the battery cell assembly (e.g., the first battery cell assembly (120A)) is not in a thermal runaway state, the step (S121) of passing the coolant (138) through the first sub-channel (135A), the step (S122) of passing the coolant (138) through the main channel (e.g., the first main channel (131)), and the step (S123) of passing the coolant (138) through the second sub-channel (135B) may be performed as described with reference to FIG. 7.

[0162] In the second state, that is, when the battery cell assembly (e.g., the first battery cell assembly (120A)) is in a thermal runaway state, the step (S131) ​​in which the blocking member (40, 50) expands to close the first sub-channel (135A) and the step (S132) in which the coolant (138) passes through the second sub-channel (135B) can be performed as described with reference to FIG. 8.

[0163] The step (S131) ​​of closing the first sub-channel (135A) may include expanding the blocking member (40, 50) within the first sub-channel (135A) to block the first sub-channel (135A) from the main channel (e.g., the first main channel (131)), as described with reference to FIG. 4 or FIG. 6. As a result, the cooling water (138) may not be included from passing through the first sub-channel (135A).

[0164] Descriptions of the blocking member (40, 50), the first sub-channel (135A), and the first battery cell assembly (120A) may refer to those described with reference to FIGS. 1 to 6. For example, the first sub-channel (135A) may overlap the first battery cell assembly (120A) in a third direction (D3). The blocking member (40, 50) may include a bimetallic portion (45, 55) including a first metal and a second metal arranged in a first direction (D1) or a second direction (D2). In a second state, the blocking member (40, 50) may expand in the first direction (D1) or the second direction (D2). In the second state, the bimetallic portion (45, 55) may expand in the first direction (D1) or the second direction (D2).

[0165] According to embodiments of the technical idea of ​​the present invention, when the blocking member expands and closes the first sub-channel (135A), the cooling performance of the coolant can be maintained for a longer period of time, and thus other battery cell assemblies (e.g., the second battery cell assembly to the fifth battery cell assembly (120B to 120F)) can still be cooled. According to embodiments of the technical idea of ​​the present invention, the life of the coolant can be extended.

[0166] According to embodiments of the technical idea of ​​the present invention, even without a separate control device or control signal, the blocking member can naturally expand due to a temperature rise within the sub-flow path, thereby blocking the sub-flow path from the main flow path. Therefore, even in a thermal runaway event situation where a problem occurs in the control device or the control signal is not transmitted normally, the sub-flow path can be blocked from the main flow path. As a result, it is expected that the performance of the coolant can be maintained and the lifespan of the coolant can be extended even in a thermal runaway event situation.

[0167] According to exemplary embodiments of the technical idea of ​​the present invention, a method (S100) for cooling a battery pack with improved performance and reliability can be provided.

[0168] According to exemplary embodiments of the technical idea of ​​the present invention, a method (S100) for cooling a battery pack with improved safety can be provided.

[0169]

[0170] (Example 6)

[0171] FIG. 11 is a schematic drawing of a vehicle (1000) including a battery pack according to exemplary embodiments of the technical idea of ​​the present invention.

[0172] Referring to FIG. 11, a vehicle (1000) may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle, and may include a battery pack (100) according to an embodiment of the present invention. The vehicle (1000) may include a four-wheeled vehicle and a two-wheeled vehicle. The vehicle (1000) may operate by receiving power from the battery pack (100) according to an embodiment of the present invention.

[0173] As described above, the battery pack (100) may include the blocking member (40, 50) described with reference to FIGS. 3 to 6. Accordingly, when a thermal runaway event occurs in a battery cell assembly, the sub-flow path under the battery cell assembly may be blocked from the main flow path. This allows the cooling performance of the coolant to be maintained for a longer period of time, and the lifespan of the coolant to be extended.

[0174] In particular, even without a separate control device or control signal, the blocking member may naturally expand due to a temperature rise within the sub-flow path, thereby blocking the sub-flow path from the main flow path. Therefore, even in the event of a thermal runaway event, where a problem occurs in the control device or the control signal may not be transmitted normally, the sub-flow path can be blocked from the main flow path. As a result, it is expected that the performance of the coolant can be maintained and the lifespan of the coolant can be extended even in the event of a thermal runaway event.

[0175] According to embodiments of the technical idea of ​​the present invention, a vehicle (1000) including a battery pack (100) with improved safety can be provided.

[0176] According to embodiments of the technical idea of ​​the present invention, a vehicle (1000) including a battery pack (100) with improved performance and reliability can be provided.

[0177] According to embodiments of the technical idea of ​​the present invention, a vehicle (1000) with enhanced safety can be provided.

[0178] According to embodiments of the technical idea of ​​the present invention, a vehicle (1000) with improved performance and reliability can be provided.

[0179]

[0180] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. Base plate intersecting the first direction; A cooling channel including a sub-euro and a main euro supplying cooling water to the sub-euro within the base plate; and Including a blocking member inside the above sub-euro, A pack housing, characterized in that the blocking member includes a bimetallic portion having different coefficients of thermal expansion and including a first metal and a second metal arranged in a second direction intersecting the first direction.

2. In paragraph 1, A pack housing, characterized in that when a thermal runaway event occurs in the battery cell assembly overlapping the sub-euro and the first direction, the blocking member is configured to close the sub-euro.

3. In paragraph 1, The above blocking member includes a first state at a first temperature and a second state at a second temperature, The second temperature is higher than the first temperature, A pack housing, characterized in that the length of the bimetallic portion in the second direction in the second state is greater than the length in the second direction in the first state.

4. In paragraph 1, The above blocking member includes a first state at a first temperature and a second state at a second temperature, The second temperature is higher than the first temperature, In the above first state, the sub euro is connected to the main euro, A pack housing, characterized in that in the second state, the sub-euro is blocked from the main euro.

5. In paragraph 4, In the above first state, the cooling water is supplied to the sub-euro, A pack housing, characterized in that in the second state, the coolant is not supplied to the sub-euro.

6. In paragraph 1, The above blocking member further includes a fixed portion and a plug portion, A pack housing, characterized in that when the temperature of the battery cell assembly overlapping the sub-euro and the first direction increases, the relative position of the plug portion with respect to the fixed portion moves in the second direction.

7. In paragraph 6, The above sub-euro further includes a connection portion with the above main euro, The above blocking member is placed within the connecting portion, A pack housing characterized in that when the temperature of the battery cell assembly rises, the plug portion is configured to contact an inner wall of the connection portion to close the sub-channel.

8. In paragraph 1, The above blocking member includes a first state at a first temperature and a second state at a second temperature, The second temperature is higher than the first temperature, The above sub-euro further includes a connection portion with the above main euro, The above blocking member is placed within the connecting portion, In the above first state, the coolant flows into the sub-channel through the connection portion, A pack housing, characterized in that in the second state, the blocking member blocks the movement of the coolant through the connecting portion.

9. In paragraph 1, The bimetallic portion includes a first layer and a second layer each including the first metal and the second metal, A pack housing, characterized in that the second metal of the first layer and the second metal of the second layer are arranged in a row in the second direction.

10. Pack housing including base plate; A cooling channel comprising a first sub-euro and a main euro supplying cooling water to the first sub-euro within the base plate; On the base plate, a first battery cell assembly overlapping the first sub-euro in the first direction; and Including a blocking member located inside the first sub-euro, The first battery cell assembly includes a first state at a first temperature and a second state at a second temperature, The second temperature is higher than the first temperature, The above blocking member includes a bimetallic portion including a first metal and a second metal having different coefficients of thermal expansion and arranged in a second direction intersecting the first direction, A battery pack, characterized in that, in the second state of the first battery cell assembly, the blocking member is configured to close the first sub-channel.

11. In paragraph 10, In the first state, the first sub-euro is connected to the main euro, A battery pack, characterized in that in the second state, the first sub-euro is blocked from the main euro.

12. In paragraph 10, The above cooling channel further comprises a second sub-euro, Further comprising a second battery cell assembly overlapping the second sub-euro and the first direction, In the first state, the main euro is connected to each of the first sub-euro and the second sub-euro, and the first sub-euro communicates with the second sub-euro through the main euro, A battery pack, characterized in that in the second state, the first sub-euro is blocked from the second sub-euro.

13. In paragraph 12, In the first state, the coolant is supplied from the main duct to the first sub-duct, and then from the first sub-duct to the second sub-duct through the main duct, A battery pack characterized in that, in the second state, the coolant is supplied from the main flow path to the second sub-flow path without passing through the first sub-flow path.

14. In paragraph 10, The above first state is a normal state of the first battery cell assembly, A battery pack, characterized in that the second state is a thermal runaway state of the first battery cell assembly.

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