Battery pack housing, battery pack comprising the battery pack housing, method for cooling a battery pack and vehicle comprising the battery pack

Abstract

According to an exemplary embodiment of the present invention, a battery pack housing is provided. The battery pack housing includes: a base plate intersecting a first direction; a cooling channel in the base plate including a sub-flow path and a main flow path for supplying cooling water to the sub-flow path; and a blocking member inside the sub-flow path, wherein the blocking member may include a bimetallic portion comprising a first metal and a second metal, the first metal and the second metal being arranged along a second direction intersecting the first direction and having different coefficients of thermal expansion.

Description

Technical Field

[0001] This disclosure relates to a battery pack housing, a battery pack including the battery pack housing, a battery pack cooling method, and a vehicle including the battery pack. This application claims the benefit of Korean Patent Application No. 10-2024-0122525, filed on September 9, 2024, the disclosure of which is incorporated herein by reference. Background Technology

[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 such as mobile phones, laptops, and cordless vacuum cleaners. Recently, the manufacturing cost per unit capacity of secondary batteries has significantly decreased due to improvements in energy density and economies of scale. As the cruising range of battery electric vehicles (BEVs) has increased to levels comparable to fuel cell vehicles, the primary application of secondary batteries is shifting from mobile devices to mobility.

[0003] The technological trend in secondary batteries for mobility applications is towards increased energy density and safety. The safety of secondary batteries in mobility applications is extremely important because it is directly related to passenger lives. The safety of secondary batteries can be achieved through mechanical robustness, reliable electrical insulation, and delays in thermal propagation during thermal runaway events. Summary of the Invention

[0004] Technical issues

[0005] The technical problem to be solved by the present invention is to provide a battery pack housing with enhanced safety.

[0006] The technical problem to be solved by the present invention is to provide a battery pack housing with improved performance and reliability.

[0007] The technical problem to be solved by the present invention is to provide a battery pack with enhanced safety.

[0008] The technical problem to be solved by the present invention is to provide a battery pack with improved performance and reliability.

[0009] The technical problem to be solved by the present invention is to provide a battery pack cooling method with enhanced safety.

[0010] The technical problem to be solved by the present invention is to provide a battery pack cooling method with improved performance and reliability.

[0011] The technical problem to be solved by the present invention is to provide a vehicle with enhanced safety.

[0012] The technical problem to be solved by the present invention is to provide a vehicle with improved performance and reliability.

[0013] Technical solution

[0014] According to an exemplary embodiment of this disclosure for solving the above-mentioned problems, a battery pack housing is provided. The battery pack housing includes: a base plate intersecting a first direction; a cooling channel within the base plate, the cooling channel including a sub-flow path and a main flow path supplying coolant to the sub-flow path; and a blocking member within the sub-flow path, wherein the blocking member includes a bimetallic portion comprising a first metal and a second metal, the first metal and the second metal having different coefficients of thermal expansion and arranged along a second direction intersecting the first direction.

[0015] When a thermal runaway event occurs in a battery cell assembly that overlaps with a sub-flow path in the first direction, the blocking member can be configured to close the sub-flow path.

[0016] The blocking member includes a first state at a first temperature and a second state at a second temperature, wherein the second temperature is higher than the first temperature, and the length of the bimetallic part in the second state in the second direction can be greater than the length of the bimetallic part in the second direction in the first state.

[0017] The blocking member includes a first state at a first temperature and a second state at a second temperature, wherein the second temperature is higher than the first temperature. 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 block the main flow path.

[0018] In the first state, coolant is supplied to the sub-flow path, and in the second state, coolant may not be supplied to the sub-flow path.

[0019] The blocking member also includes a fixing part and a plug part, wherein when the temperature of the battery cell assembly overlapping with the sub-flow path in the first direction rises, the relative position of the plug part with respect to the fixing part can move in the second direction.

[0020] The sub-flow path also includes a connection to the main flow path, wherein a blocking member is disposed within the connection, and the plug portion can be configured to contact the inner wall of the connection to close the sub-flow path when the temperature of the battery cell assembly rises.

[0021] The blocking member includes a first state at a first temperature and a second state at a second temperature, wherein the second temperature is higher than the first temperature. The sub-flow path also includes a connection with the main flow path. The blocking member is disposed in the connection. In the first state, coolant flows into the sub-flow path through the connection, and in the second state, the blocking member can block the movement of coolant through the connection.

[0022] The bimetallic portion includes a first layer and a second layer, each of the first layer and the second layer including a first metal and a second metal, wherein the second metal of the first layer and the second metal of the second layer can be arranged continuously along a second direction.

[0023] According to an exemplary embodiment of the present disclosure for solving the above-mentioned problems, a battery pack is provided. The battery pack includes: a battery pack housing including a base plate; a cooling channel within the base plate, the cooling channel including a first sub-flow path and a main flow path supplying coolant to the first sub-flow path; a first battery cell assembly located on the base plate and overlapping the first sub-flow path in a first direction; and a blocking member located within the first sub-flow path, wherein the first battery cell assembly includes a first state at a first temperature and a second state at a second temperature, wherein the second temperature is higher than the first temperature, the blocking member includes a bimetallic portion including a first metal and a second metal, the first metal and the second metal having different coefficients of thermal expansion and arranged along a second direction intersecting the first direction, wherein in the second state of the first battery cell assembly, the blocking member can be configured to close the first sub-flow path.

[0024] In the first state, the first sub-path is connected to the main path, and in the second state, the first sub-path can be blocked from the main path.

[0025] The cooling channel also includes a second sub-flow path, and the battery pack also includes a second battery cell assembly. The second battery cell assembly overlaps with the second sub-flow path in a first direction. In a first state, the main flow path is connected to the first sub-flow path and the second sub-flow path respectively, and the first sub-flow path is connected to the second sub-flow path through the main flow path. In a second state, the first sub-flow path can be blocked from the second sub-flow path.

[0026] In the first state, coolant is supplied from the main flow path to the first subflow path, and then from the first subflow path to the second subflow path via the main flow path. In the second state, coolant can be supplied from the main flow path to the second subflow path without passing through the first subflow path.

[0027] The first state is the normal state of the first battery cell assembly, and the second state can be the thermal runaway state of the first battery cell assembly.

[0028] Beneficial effects

[0029] According to an exemplary embodiment of this disclosure, the battery pack housing may include a blocking member disposed within a sub-flow path. The blocking member includes a bimetallic portion and, in the event of a thermal runaway event in the battery cell assembly, can expand in one direction to close the sub-flow path. By preventing coolant from flowing into the sub-flow path below the battery cell assembly where a thermal runaway event has occurred, the cooling performance of the coolant can be maintained for a longer period.

[0030] According to exemplary embodiments of this disclosure, a battery pack housing with enhanced safety can be provided.

[0031] According to exemplary embodiments of this disclosure, a battery pack housing with improved performance and reliability can be provided.

[0032] According to exemplary embodiments of this disclosure, a battery pack with enhanced safety can be provided.

[0033] According to exemplary embodiments of this disclosure, a battery pack with improved performance and reliability can be provided.

[0034] According to exemplary embodiments of this disclosure, a battery pack cooling method with enhanced safety can be provided.

[0035] According to exemplary embodiments of this disclosure, a battery pack cooling method with improved performance and reliability can be provided.

[0036] According to exemplary embodiments of this disclosure, a vehicle with enhanced safety can be provided.

[0037] According to exemplary embodiments of this disclosure, a vehicle with improved performance and reliability can be provided.

[0038] The effects obtainable from the exemplary embodiments of this disclosure are not limited to those described above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of this disclosure pertain. In other words, unintended effects of practicing the exemplary embodiments of this disclosure can also be derived by those skilled in the art from the exemplary embodiments of this disclosure. Attached Figure Description

[0039] Figure 1 This is a schematic plan view of a battery pack according to an exemplary embodiment of the technical concept of this disclosure.

[0040] Figure 2 This is a plan view schematically illustrating the cooling channels of a battery pack housing according to an exemplary embodiment of the technical concept of this disclosure.

[0041] Figure 3 This is a plan view of a blocking member of a battery pack housing, used to explain an exemplary embodiment of the technical concept of this disclosure.

[0042] Figure 4 This is a plan view of a blocking member of a battery pack housing, used to explain an exemplary embodiment of the technical concept of this disclosure.

[0043] Figure 5 This is a plan view of a blocking member of a battery pack housing, used to explain an exemplary embodiment of the technical concept of this disclosure.

[0044] Figure 6 This is a plan view of a blocking member of a battery pack housing, used to explain an exemplary embodiment of the technical concept of this disclosure.

[0045] Figure 7 This is a plan view of a battery pack housing used to explain exemplary embodiments of the technical concept according to this disclosure.

[0046] Figure 8 This is a plan view of a battery pack housing used to explain exemplary embodiments of the technical concept according to this disclosure.

[0047] Figure 9 This is a plan view of a battery pack housing used to explain exemplary embodiments of the technical concept according to this disclosure.

[0048] Figure 10 This is a flowchart for explaining an exemplary embodiment of a battery pack cooling method based on the technical concept of this disclosure.

[0049] Figure 11 This is a diagram schematically illustrating an exemplary embodiment of a vehicle including a battery pack according to the technical concept of this disclosure. Detailed Implementation

[0050] In the following, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that the terms and words used in this specification and claims should not be construed as having their ordinary or dictionary meaning, but rather should be interpreted as having meanings and concepts consistent with the technical ideas of the present disclosure, based on the principle that the inventor can define the concepts of the terms in a manner he considers best suited to describe his disclosure.

[0051] Therefore, it should be understood that the embodiments described herein and the configurations shown in the accompanying drawings are merely the most preferred embodiments of this disclosure and are not an exhaustive list of the technical ideas of this disclosure, and various equivalents and modifications that can replace them may exist at the time of submission.

[0052] Furthermore, in describing this disclosure, detailed descriptions of relevant known configurations or features have been omitted where such descriptions would obscure the essence of this disclosure.

[0053] Because embodiments of this disclosure are provided to explain this disclosure more fully to those skilled in the art, the shapes and dimensions of components in the drawings may be exaggerated, omitted, or shown schematically for clarity. Therefore, the dimensions or proportions of each component do not necessarily indicate its actual size or proportion.

[0054] (First Implementation)

[0055] Figure 1 This is a schematic plan view of a battery pack 100 according to an exemplary embodiment of the technical concept of this disclosure.

[0056] Reference Figure 1 The battery pack 100 may include a battery pack housing 110 and a plurality of battery cell assemblies 120. The battery pack 100 may be an end product installed in applications such as vehicles.

[0057] The battery pack housing 110 provides space for mounting the battery cell assembly 120. The battery pack housing 110 may include a base plate 111, side walls 112, 113, 114, 115, a central beam 116, and a crossbeam 117.

[0058] Here, the first direction D1 and the second direction D2 can 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 can be substantially perpendicular to the mounting surface of the base plate 111.

[0059] Side walls 112, 113, 114, and 115 may be substantially perpendicular to the base plate 111. Side walls 112 and 113 may extend along a first direction D1. Side walls 114 and 115 may extend along a second direction D2.

[0060] The central beam 116 can extend along the first direction D1. The central beam 116 can be inserted between the side walls 112 and 113. The crossbeam 117 can extend along the second direction D2. The crossbeam 117 can be inserted between the side walls 114 and 115.

[0061] Multiple battery cell assemblies 120 can be mounted on the base plate 111 of the battery pack housing 110. The base plate 111 can support the multiple battery cell assemblies 120. Side walls 112, 113, 114, and 115 can horizontally surround the multiple battery cell assemblies 120. The side walls 112, 113, 114, and 115 can protect the multiple battery cell assemblies 120. The multiple battery cell assemblies 120 can be mounted on the base plate 111 within the space defined by the crossbeam 117.

[0062] The battery cell assembly 120 may further include a plurality of battery cells disposed along a first direction D1 and a pad disposed between the plurality of battery cells. The pad is disposed between the plurality of battery cells along the first direction D1 and may overlap with the plurality of battery cells along the first direction D1.

[0063] The pad can absorb the expansion of multiple battery cells. The pad may include compressible materials. The pad may include PU (polyurethane). The pad may also include refractory materials.

[0064] The battery pack 100 may also include a battery pack cover attached to the side walls 112, 113, 114, 115 of the battery pack housing 110. The battery pack cover may cover components installed inside the battery pack 100, such as multiple battery cell assemblies 120 and electrical components. The battery pack cover may be secured to the battery pack housing 110 by a mechanical connection such as bolts.

[0065] exist Figure 1 In this context, the arrangement of multiple battery cell assemblies 120 can be referred to as 3. 2. Arrangement. For example, multiple battery cell assemblies 120 may include 3. The first battery cell assembly 120A, the second battery cell assembly 120B, the third battery cell assembly 120C, the fourth battery cell assembly 120D, the fifth battery cell assembly 120E, and the sixth battery cell assembly 120F are arranged in a row. Figure 1 The arrangement of the multiple battery cell assemblies 120 disclosed herein is a non-limiting example and does not limit the technical concept of this disclosure in any way. Based on the content described herein, those skilled in the art will be able to readily implement the M... A plurality of battery cell assemblies 120 arranged in N (where M and N are each integers of 2 or greater).

[0066] The battery pack 100 may also include a BMS (Battery Management System). The BMS can be configured to perform monitoring, balancing, and control of the battery pack 100. Monitoring of the battery pack 100 may include measuring the voltage and current at specific nodes within the multiple battery cell assemblies 120, and measuring the temperature at designated locations within the battery pack 100. The battery pack 100 may include instruments for measuring the aforementioned voltage, current, and temperature.

[0067] Balancing the battery pack 100 is an operation to reduce deviations among the multiple battery cell assemblies 120. Controlling the battery pack 100 includes preventing overcharging, over-discharging, and overcurrent. Through monitoring, balancing, and control, the battery pack 100 can operate under optimal conditions, thereby preventing a shortened lifespan for each of the multiple battery cell assemblies 120.

[0068] The battery pack 100 may also 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 can prevent overheating of each of the multiple battery cell assemblies 120 by circulating air within the battery pack 100. The PRA can be configured to supply or disconnect power from the high-voltage battery to an external load (e.g., a vehicle motor). In the event of an abnormal voltage such as a voltage surge, the PRA can protect the multiple battery cell assemblies 120 and the external load (e.g., the vehicle motor) by disconnecting power supply to the external load (e.g., the vehicle motor). Additional electrical components may be inserted between the multiple 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.

[0069] The battery pack 100 may also include a plurality of internal busbars configured to electrically connect a plurality of battery cell assemblies 120. The plurality of battery cell assemblies 120 may be connected in series via the plurality of internal busbars. Therefore, the battery pack 100 may be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0070] (Second Implementation)

[0071] Figure 2 This is a schematic plan view of the cooling channel 130 of a battery pack housing 110 according to an exemplary embodiment based on the technical concept of this disclosure.

[0072] Refer to together Figure 1 and Figure 2The base plate 111 of the battery 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 correspond to the regions below the first battery cell assembly 120A to the sixth battery cell assembly 120F, 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 is disposed on the first region 111A of the base plate 111, and the first region 111A may overlap with the first battery cell assembly 120A in the third direction D3. The second battery cell assembly 120B is disposed on the second region 111B of the base plate 111, and the second region 111B may overlap with the second battery cell assembly 120B in the third direction D3. The third battery cell assembly 120C is disposed on the third region 111C of the base plate 111, and the third region 111C may overlap with the third battery cell assembly 120C in the third direction D3. The fourth battery cell assembly 120D is disposed on the fourth region 111D of the base plate 111, and the fourth region 111D may overlap with the fourth battery cell assembly 120D in the third direction D3. The fifth battery cell assembly 120E is disposed on the fifth region 111E of the base plate 111, and the fifth region 111E may overlap with the fifth battery cell assembly 120E in the third direction D3. The sixth battery cell assembly 120F is disposed on the sixth region 111F of the base plate 111, and the sixth region 111F may overlap with the sixth battery cell assembly 120F in the third direction D3.

[0073] Cooling channels 130 can be disposed within the base plate 111. Cooling channels 130 may include first sub-flow paths 135A to sixth sub-flow paths 135F. Each of the first sub-flow paths 135A to sixth sub-flow paths 135F is disposed within a first region 111A to a sixth region 111F of the base plate 111, and may correspond to the first battery cell assemblies 120A to the sixth battery cell assemblies 120F. For example, the first sub-flow path 135A is disposed below the first battery cell assembly 120A, overlaps with the first battery cell assembly 120A in the third direction D3, and can cool the first battery cell assembly 120A. The second sub-flow path 135B is disposed below the second battery cell assembly 120B, overlaps with the second battery cell assembly 120B in the third direction D3, and can cool the second battery cell assembly 120B. The third sub-flow path 135C is located below the third battery cell assembly 120C, overlaps with the third battery cell assembly 120C on the third-direction D3, and can cool the third battery cell assembly 120C. The fourth sub-flow path 135D is located below the fourth battery cell assembly 120D, overlaps with the fourth battery cell assembly 120D on the third-direction D3, and can cool the fourth battery cell assembly 120D. The fifth sub-flow path 135E is located below the fifth battery cell assembly 120E, overlaps with the fifth battery cell assembly 120E on the third-direction D3, and can cool the fifth battery cell assembly 120E. The sixth sub-flow path 135F is located below the sixth battery cell assembly 120F, overlaps with the sixth battery cell assembly 120F on the third-direction D3, and can cool the sixth battery cell assembly 120F.

[0074] The cooling passage 130 may also include a first main flow path 131 that supplies coolant to a first sub-flow path 135A, a second sub-flow path 135B, and a third sub-flow path 135C. The first main flow path 131 may be connected to each of the first sub-flow path 135A, the second sub-flow path 135B, and the third sub-flow path 135C.

[0075] The cooling passage 130 may further include a second main flow path 132 that supplies coolant to the fourth sub-flow path 135D, the fifth sub-flow path 135E, and the sixth sub-flow path 135F. The second main flow path 132 may be connected to the fourth sub-flow path 135D, the fifth sub-flow path 135E, and the sixth sub-flow path 135F, respectively. The second main flow path 132 may be connected to the first main flow path 131.

[0076] The cooling passage 130 may further include an inlet port 133 and an outlet port 134. The inlet port 133 is connected to a coolant reservoir, enabling it to supply coolant to the first main flow path 131 and the second main flow path 132. The outlet port 134 can discharge coolant that has passed through the first main flow path 131 and the second main flow path 132 from the cooling passage 130.

[0077] A blocking member may be provided within the first sub-flow paths 135A to the sixth sub-flow paths 135F of the cooling channel 130 to enclose them from the main flow paths 131 and 132. See below for reference. Figure 3 and Figure 4 The blocking member 40 in the first sub-flow path 135A is described by way of example.

[0078] Figure 3 This is a plan view illustrating the blocking member 40 of a battery pack housing 110 according to an exemplary embodiment based on the technical concept of this disclosure. Specifically, Figure 3 yes Figure 2 An enlarged view of the EX1 region shows the blocking member 40 in the first state S1.

[0079] Figure 4 This is a plan view illustrating the blocking member 40 of a battery pack housing 110 according to an exemplary embodiment based on the technical concept of this disclosure. Specifically, Figure 4 yes Figure 2 An enlarged view of the EX1 region shows the blocking member 40 in the second state S2.

[0080] Common Reference Figure 1 , Figure 3 and Figure 4 The blocking member 40 can be disposed within the first sub-flow path 135A. The blocking member 40 can be configured to shut down the first sub-flow path 135A in the event of a thermal runaway event in the first battery cell assembly 120A.

[0081] The blocking member 40 may include a bimetallic portion 45, a fixing portion 46, and a plug portion 47. The fixing portion 46 may be a portion fixed to a wall within the first sub-flow path 135A. The plug portion 47 may be disposed on the bimetallic portion 45 such that its position changes with the length of the bimetallic portion 45.

[0082] The bimetallic portion 45 may include a first metal and a second metal with different coefficients of thermal expansion. For example, the coefficient of thermal expansion of the first metal may be greater than that of the second metal. Specifically, the bimetallic portion 45 may include a first layer 41 and a second layer 42, which respectively include 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 continuously disposed. 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 disposed in contact in a 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 spaced apart, and the second metal layer 41b and the second metal layer 42b may be interposed between the first metal layer 41a of the first layer 41 and the first metal layer 42a of the second layer 42. Although Figure 3 and Figure 4 The bimetallic portion 45 is shown as including a first layer 41 and a second layer 42, but it should be understood that the bimetallic portion 45 according to the technical concept of this disclosure may include more than one first layer 41 and more than one second layer 42.

[0083] The first layer 41 and the second layer 42 can be arranged along the second direction D2. The first metal layer 41a and the second metal layer 41b of the first layer 41 can be arranged along the second direction D2. The first metal layer 42a and the second metal layer 42b of the second layer 42 can be arranged along the second direction D2.

[0084] Specifically, the blocking member 40 may be disposed at the boundary between the first sub-flow path 135A and the first main flow path 131. For example, the first sub-flow path 135A may include two portions connected to the first main flow path 131, and the blocking member 40 may be disposed within these two portions. For example, the first sub-flow path 135A may include an inlet for coolant to flow into the first sub-flow path 135A and an outlet for coolant to flow out of the first sub-flow path 135A, and the blocking member 40 may be disposed at these two boundaries.

[0085] In such Figure 3 In the first state S1 shown, the first battery cell assembly 120A can be in a normal state where no thermal runaway event has occurred. In the first state S1, the temperature of the first battery cell assembly 120A can be a first temperature. For example, the first temperature can be less than 100°C. For example, the first temperature can be less than 60°C.

[0086] In the first state S1, the blocking member 40 can be in a non-expanded state. Specifically, the bimetallic portion 45 can be in a non-expanded state. For example, the first layer 41 and the second layer 42 of the bimetallic portion 45 can be joined together in a manner where they contact each other in the second direction D2. In the first state S1, the length of the bimetallic portion 45 in the second direction D2 can be a first length L1. In the first state S1, the blocking member 40 can not block the first sub-flow path 135A. Specifically, in the first state S1, the blocking member 40 can also not block the first sub-flow path 135A from the first main flow path 131. In the first state S1, the first sub-flow path 135A can be connected to the first main flow path 131.

[0087] For example, the first sub-flow path 135A may include a connection portion 135A_C with the first main flow path 131. A blocking member 40 may be disposed within the connection portion 135A_C. In the first state S1, the blocking member 40 may not completely block the connection portion 135A_C, leaving a gap. Coolant supplied from the first main flow path 131 can flow into the first sub-flow path 135A through this gap.

[0088] In the second state S2, as Figure 4 As shown, the first battery cell assembly 120A can 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 can be a second temperature. The second temperature can be higher than the first temperature in the first state S1. For example, the second temperature can 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, when the temperature of the first battery cell assembly 120A rises, the temperature of the first region 111A and the first sub-flow path 135A can rise, and the bimetallic portion 45 can bend and expand toward the first metal, which has a larger 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. Displacement can occur when the first layer 41 and the second layer 42 deform by convex bending in different directions. The bimetallic portion 45 can expand in the second direction D2 by a distance equal to the sum of the displacements of the first layer 41 and the second layer 42.

[0090] In the second state S2, the length of the bimetallic portion 45 in the second direction D2 can 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 can be greater than the first length L1 of the bimetallic portion 45 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 can be greater than the length of the blocking member 40 in the second direction D2 in the first state S1.

[0091] In the second state S2, when the blocking member 40 expands in the second direction D2, the first sub-flow path 135A can be blocked. Specifically, in the second state S2, the blocking member 40 can block the first sub-flow path 135A from the first main flow path 131. In the second state S2, the first sub-flow path 135A may also not be connected to the first main flow path 131. In the second state S2, the first sub-flow path 135A can be closed.

[0092] For example, the blocking member 40 can unidirectionally block the connection portion 135A_C by expanding within it in the second direction D2. The blocking member 40 can expand within the connection portion 135A_C from one inner wall to the other to block the connection portion 135A_C. In this specification, blocking the connection portion 135A_C can mean blocking a channel, preventing materials such as coolant from flowing through the connection portion 135A_C, even if the connection portion 135A_C is not completely sealed and has no empty space.

[0093] Specifically, when the bimetallic portion 45 of the blocking member 40 expands in the second direction D2, the position of the plug portion 47 can move in the second direction D2. For example, the relative position of the plug portion 47 with respect to the fixing portion 46 can move in the second direction D2. As a result, the plug portion 47 can contact the inner wall of the connecting portion 135A_C, thereby sealing the first sub-flow path 135A. The inflow of coolant is blocked, thereby preventing coolant from being supplied from the first main flow path 131 to the first sub-flow path 135A.

[0094] For reference Figure 3 and Figure 4 As described, the blocking member 40 is disposed within the first sub-flow path 135A. Therefore, when a thermal runaway event occurs in the first battery cell assembly 120A, the first sub-flow path 135A can be isolated from the first main flow path 131, and the first sub-flow path 135A can be shut down.

[0095] Unlike embodiments based on the technical concept of this disclosure, when a thermal runaway event occurs in the first battery cell assembly 120A, the first sub-flow path 135A is not isolated from the first main flow path 131. Therefore, if coolant flows into the first sub-flow path 135A, the coolant can be heated by heat and flames that may be generated by the thermal runaway event. Such heated coolant may become unable to cool other battery cell assemblies, such as the second battery cell assemblies 120B to the fifth battery cell assemblies 120F, due to its reduced cooling capacity.

[0096] According to embodiments based on the technical concept of this disclosure, when the blocking member 40 expands to close the first sub-flow path 135A, the cooling performance of the coolant can be maintained for a longer period, thereby allowing other battery cell assemblies (e.g., second battery cell assemblies 120B to fifth battery cell assemblies 120F) to still be cooled. According to embodiments based on the technical concept of this disclosure, the service life of the coolant can be extended.

[0097] Refer again Figure 2 The blocking member is also provided in the second sub-flow path 135B to the sixth sub-flow path 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 path 135B to the sixth sub-flow path 135F can be shut down respectively.

[0098] According to embodiments based on the technical concept of this disclosure, even without a separate control device or control signal, the expansion of the blocking member caused by the temperature rise within the sub-flow path naturally achieves the effect of isolating the sub-flow path from the main flow path. Therefore, even in the event of a thermal runaway event that could potentially cause problems with the control device or prevent the normal transmission of the control signal, the sub-flow path can still be isolated from the main flow path. This enables the desired effects of maintaining coolant performance and extending coolant life to be achieved even during a thermal runaway event.

[0099] An example of the technical concept based on this disclosure provides a battery pack housing 110 with improved performance and reliability.

[0100] An example of the technical concept based on this disclosure can provide a battery pack housing 110 with enhanced safety.

[0101] An example of the technical concept based on this disclosure can provide a battery pack 100 including a battery pack housing 110 with improved performance and reliability.

[0102] An example of the technical concept based on this disclosure can provide a battery pack 100 including a battery pack housing 110 with enhanced safety.

[0103] (Third Implementation)

[0104] Figure 5 This is a plan view illustrating the blocking member 50 of a battery pack housing 110 according to an exemplary embodiment based on the technical concept of this disclosure. Specifically, Figure 5 yes Figure 2 An enlarged view of the EX1 region shows the blocking member 50 in the first state S1.

[0105] Figure 6 This is a plan view illustrating the blocking member 50 of a battery pack housing 110 according to an exemplary embodiment based on the technical concept of this disclosure. Specifically, Figure 6 yes Figure 2 An enlarged view of the EX1 region shows the blocking member 50 in the second state S2.

[0106] Common Reference Figure 2 , Figure 5 and Figure 6 The blocking member 50 may be disposed within the first sub-current path 135A. The blocking member 50 may be configured to shut down the first sub-current path 135A in the event of a thermal runaway event in the first battery cell assembly 120A. The following description will focus on the reference... Figure 3 and Figure 4 The differences in the described blocking member 40.

[0107] 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 with different coefficients of thermal expansion. For example, the coefficient of thermal expansion of the first metal may be greater than that 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 continuously disposed. For example, the second metal layer 51b of the first layer 51 and the second metal layer 52b of the second layer 52 may be disposed in contact.

[0108] The first layer 51 and the second layer 52 can be arranged along the first direction D1. The first metal layer 51a and the second metal layer 51b of the first layer 51 can be arranged along the first direction D1. The first metal layer 52a and the second metal layer 52b of the second layer 52 can be arranged along the first direction D1.

[0109] Specifically, the blocking member 50 may be disposed at the boundary between the first sub-flow path 135A and the first main flow path 131. For example, the first sub-flow path 135A may include two portions connected to the first main flow path 131, and the blocking member 50 may be disposed within these two portions. For example, it may include a boundary for coolant to flow into the first sub-flow path 135A and a boundary for coolant to flow out of the first sub-flow path 135A, and the blocking member 50 may be disposed at these two boundaries.

[0110] In such Figure 5 In the first state S1 shown, the first battery cell assembly 120A can be in a normal state where no thermal runaway event has occurred. In the first state S1, the temperature of the first battery cell assembly 120A can be a first temperature. For example, the first temperature can be below 100°C. For example, the first temperature can be below 60°C.

[0111] In the first state S1, the blocking member 50 can be in a non-expanded state. Specifically, the bimetallic portion 55 can be in a non-expanded state. In the first state S1, the length of the bimetallic portion 55 in the first direction D1 can be a third length L3. In the first state S1, the blocking member 50 can not block the first sub-flow path 135A. Specifically, in the first state S1, the blocking member 50 can also not block the first sub-flow path 135A from the first main flow path 131. In the first state S1, the first sub-flow path 135A can be connected to the first main flow path 131.

[0112] For example, the first sub-flow path 135A may include a connection portion 135A_C with the first main flow path 131. A blocking member 50 may be disposed within the connection portion 135A_C. In the first state S1, the blocking member 50 may not completely block the connection portion 135A_C, leaving a gap. Coolant supplied from the first main flow path 131 can flow into the first sub-flow path 135A through this gap.

[0113] In the second state S2, as Figure 6 As shown, the first battery cell assembly 120A can 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 can be a second temperature. The second temperature can be higher than the first temperature. For example, the second temperature can be 100°C or higher.

[0114] 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, when the temperature of the first battery cell assembly 120A rises, the temperature within the first sub-flow path 135A can rise, and the bimetallic portion 55 can expand.

[0115] In the second state S2, the length of the bimetallic portion 55 in the first direction D1 can be a fourth length L4. For example, the fourth length L4 of the bimetallic portion 55 in the first direction D1 in the second state S2 can 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 can be greater than the length of the blocking member 50 in the first direction D1 in the first state S1.

[0116] In the second state S2, when the blocking member 50 expands in the first direction D1, the first sub-flow path 135A can be blocked. Specifically, in the second state S2, the blocking member 50 can block the first sub-flow path 135A from the first main flow path 131. In the second state S2, the first sub-flow path 135A may also not be connected to the first main flow path 131. In the second state S2, the first sub-flow path 135A can be closed.

[0117] For example, the blocking member 50 can unidirectionally block the connection portion 135A_C by expanding within it in the first direction D1. The blocking member 50 can expand within the connection portion 135A_C from one inner wall to another, thereby blocking the connection portion 135A_C. For example, the blocking member 50 can block channels through which coolant can pass within the connection portion 135A_C. Therefore, the inflow of coolant is blocked by the blocking member 50, thereby preventing coolant from being supplied from the first main flow path 131 to the first sub-flow path 135A.

[0118] An example of the technical concept based on this disclosure provides a battery pack housing 110 with improved performance and reliability.

[0119] An example of the technical concept based on this disclosure can provide a battery pack housing 110 with enhanced safety.

[0120] An example of the technical concept based on this disclosure can provide a battery pack 100 including a battery pack housing 110 with improved performance and reliability.

[0121] An example of the technical concept based on this disclosure can provide a battery pack 100 including a battery pack housing 110 with enhanced safety.

[0122] (Fourth Implementation)

[0123] Figure 7 This is a plan view illustrating an exemplary embodiment of a battery pack 100 based on the technical concept of this disclosure. Specifically, Figure 7 yes Figure 2 The enlarged view of region EX2 shows the battery pack 100 in the first state S11.

[0124] Figure 8 This is a plan view illustrating an exemplary embodiment of a battery pack 100 based on the technical concept of this disclosure. Specifically, Figure 8 yes Figure 2 An enlarged view of region EX2 in the image shows the battery pack 100 in the second state S12.

[0125] Figure 9 This is a plan view illustrating an exemplary embodiment of a battery pack 100 based on the technical concept of this disclosure. Specifically, Figure 9 yes Figure 2 The enlarged view of region EX2 shows the battery pack 100 in the third state S13.

[0126] Common Reference Figure 1 , Figure 2 and Figure 7 In the 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 can be in a normal state where no thermal runaway event has occurred. In the first state S11, the temperature of the first battery cell assembly 120A, the second battery cell assembly 120B, and the third battery cell assembly 120C can be a first temperature. For example, the first temperature can be below 100°C. For example, the first temperature can be below 60°C.

[0127] The blocking member can be disposed in each of the first sub-flow path 135A, the second sub-flow path 135B, and the third sub-flow path 135C. For example, as Figure 3 and Figure 4 As shown, a blocking member 40 including a bimetallic portion 45 can be provided. For example... Figure 5 and Figure 6 As shown, a blocking member 50 including a bimetallic part 55 can be provided.

[0128] In the first state S11, the blocking members including bimetallic portions disposed in the first sub-flow path 135A, the second sub-flow path 135B, and the third sub-flow path 135C respectively can be in a non-expanded state. (Similar to reference...) Figure 3 or Figure 5 As described, the first sub-flow path 135A, the second sub-flow path 135B and the third sub-flow path 135C can each be connected to the first main flow path 131 without blocking the first main flow path 131.

[0129] In the first state S11, coolant 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. Coolant 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, coolant can be supplied from the first main flow path 131 to the first sub-flow path 135A, and coolant passing through the first sub-flow path 135A can be supplied to the second sub-flow path 135B via the first main flow path 131. Coolant passing through the second sub-flow path 135B can be supplied to the third sub-flow path 135C via the first main flow path 131. Coolant passing through the third sub-flow path 135C can be supplied back to the first sub-flow path 135A via the second main flow path 132, etc. In other words, in the first state S11, the first main path 131 allows the first sub-path 135A, the second sub-path 135B, and the third sub-path 135C to be connected to each other.

[0130] Common Reference Figure 1 , Figure 2 and Figure 8 In the second state S12, the first battery cell assembly 120A of the battery pack 100 can 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 can be a second temperature. The second temperature can be higher than the first temperature in the first state S11. For example, the second temperature can be 100°C or higher.

[0131] In the second state S12, the blocking member including the bimetallic portion within the first sub-flow path 135A can be in an expanded state. (Similar to reference...) Figure 4 or Figure 6 As described, the first sub-path 135A can be blocked from the first main path 131. The first sub-path 135A may not be connected to the first main path 131.

[0132] In the second state S12, coolant 138 may not be supplied from the first main flow path 131 to the first sub-flow path 135A. Coolant 138 may not flow into the first sub-flow path 135A. Therefore, coolant 138 may not pass through the first sub-flow path 135A, where its temperature has already increased.

[0133] For example, as described above, the blocking member 40 can be provided in the inlet of the coolant flowing into the first sub-flow path 135A and the outlet of the coolant flowing out of the first sub-flow path 135A. Therefore, the first sub-flow path 135A is blocked from the first main flow path 131, preventing the coolant 138 from flowing into the first sub-flow path 135A.

[0134] At this time, the second battery cell assembly 120B and the third battery cell assembly 120C can be in a state where no thermal runaway event TR has occurred, and each can be connected to the first main flow path 131 without being blocked by it. Coolant 138 can 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, coolant 138 can 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.

[0135] In the second state S12, the first sub-flow path 135A can be isolated from the second sub-flow path 135B and the third sub-flow path 135C.

[0136] Reference Figure 1 , Figure 2 and Figure 9 In the third state S13, the second battery cell assembly 120B of the battery pack 100 can be in a state where a thermal runaway event TR has occurred.

[0137] Similar to a reference Figure 8 The description states that the blocking member including the bimetallic portion in the second sub-flow path 135B can be in an expanded state, and through the blocking member, the second sub-flow path 135B can be blocked and disconnected from the first main flow path 131.

[0138] In the third state S13, coolant 138 may not be supplied from the first main flow path 131 to the second sub-flow path 135B. Coolant 138 may not flow into the second sub-flow path 135B. Therefore, coolant 138 may not pass through the second sub-flow path 135B, where its temperature has already increased.

[0139] For example, a blocking member can be provided in the inlet of the coolant flowing into the second sub-flow path 135B and the outlet of the coolant flowing out of the second sub-flow path 135B. Therefore, the second sub-flow path 135B is blocked from the first main flow path 131, preventing the coolant 138 from flowing into the second sub-flow path 135B.

[0140] At this time, the first sub-flow path 135A and the third sub-flow path 135C, respectively below the first battery cell assembly 120A and the third battery cell assembly 130C where no thermal runaway event TR has occurred, are not blocked by the first main flow path 131 and can be connected to the first main flow path 131. Coolant 138 can 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, coolant 138 can 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.

[0141] In the third state S13, the second sub-flow path 135B can be isolated from the first sub-flow path 135A and the third sub-flow path 135C.

[0142] According to embodiments based on the technical concept of this disclosure, when the first sub-flow path 135A is shut down during a thermal runaway event TR in the first battery cell assembly 120A, the cooling performance of the coolant can be maintained for a longer period. Therefore, other battery cell assemblies (e.g., the second to fifth battery cell assemblies 120F) can still be cooled. Specifically, the coolant can cool not only the second battery cell assembly 120B adjacent to the first battery cell assembly 120A where the thermal runaway event TR occurred, but also the non-adjacent third battery cell assembly 120C.

[0143] Similarly, according to embodiments based on the technical concept of this disclosure, when the second sub-flow path 135B is shut down during a thermal runaway event TR in the second battery cell assembly 120B, the cooling performance of the coolant can be maintained for a longer period. Therefore, other battery cell assemblies (e.g., the first battery cell assembly 120A, the third battery cell assembly 120C to the fifth battery cell assembly 120F) can still be cooled.

[0144] According to the embodiments based on the technical concept of this disclosure, the service life of the coolant can be extended.

[0145] According to embodiments based on the technical concept of this disclosure, even without a separate control device or control signal, the expansion of the blocking member caused by the temperature rise within the sub-flow path can naturally isolate the sub-flow path from the main flow path. Therefore, even in the event of a thermal runaway incident where a problem occurs in the control device within the battery pack or the control signal cannot be transmitted normally, the sub-flow path can be isolated from the main flow path. Thus, even during a thermal runaway incident, the performance of the coolant can be maintained and its service life extended.

[0146] An example of the technical concept based on this disclosure provides a battery pack housing 110 with improved performance and reliability.

[0147] An example of the technical concept based on this disclosure provides a battery pack housing 110 with enhanced safety.

[0148] An example of the technical concept based on this disclosure can provide a battery pack 100 including a battery pack housing 110 with improved performance and reliability.

[0149] An example of the technical concept based on this disclosure can provide a battery pack 100 including a battery pack housing 110 with enhanced safety.

[0150] (Fifth implementation method)

[0151] Figure 10 This is a flowchart illustrating a cooling method S100 for a battery pack according to an exemplary embodiment based on the technical concept of this disclosure.

[0152] Reference Figure 1 , Figure 2 , Figure 7 and Figure 8 Whether the coolant passes through the sub-flow path can vary depending on whether the battery cell assembly is in a state of thermal runaway.

[0153] First, step S110, which determines whether the battery cell assembly is in a thermal runaway state, can be performed. In these embodiments, step S110, which determines whether the battery cell assembly is in a thermal runaway state, may not be performed separately. However, depending on the thermal runaway state, step S121, which allows the coolant 138 to flow through the first sub-flow path 135A, or step S131, which shuts off the first sub-flow path 135A, can be performed.

[0154] The battery cell assembly can include a first state and a second state, where the first state is a normal state and the second state is a thermal runaway state. In the first state, the battery cell assembly can be at a first temperature. In the second state, the battery cell assembly can be at a second temperature higher than the first temperature. For example, the first temperature can be less than 100°C. For example, the first temperature can be less than 60°C. For example, the second temperature can be 100°C or higher.

[0155] 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, as referred to Figure 7 As described, steps S121, S122, S123, and S124 can be performed, which involve coolant 138 passing through a first sub-flow path 135A, coolant 138 passing through a main flow path (e.g., the first main flow path 131), and coolant 138 passing through a second sub-flow path 135B.

[0156] 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, as referred to Figure 8 As described, step S131, in which blocking members 40 and 50 expand to close the first sub-flow path 135A, and step S132, in which coolant 138 flows through the second sub-flow path 135B, can be performed.

[0157] For reference Figure 4 or Figure 6As described, step S131 of closing the first sub-flow path 135A may include expanding the blocking members 40, 50 within the first sub-flow path 135A to block the first sub-flow path 135A from the main flow path (e.g., the first main flow path 131). As a result, coolant 138 may not flow through the first sub-flow path 135A.

[0158] For a description of the blocking components 40 and 50, the first sub-flow path 135A, and the first battery cell assembly 120A, please refer to [reference needed]. Figures 1 to 6 The description is as follows. For example, the first sub-flow path 135A may overlap with the first battery cell assembly 120A in the third direction D3. The blocking members 40 and 50 may include bimetallic portions 45 and 55, which include a first metal and a second metal arranged along a first direction D1 or a second direction D2. In the second state, the blocking members 40 and 50 may expand in the first direction D1 or the second direction D2. In the second state, the bimetallic portions 45 and 55 may expand in the first direction D1 or the second direction D2.

[0159] According to embodiments based on the technical concept of this disclosure, when the blocking member expands to close the first sub-flow path 135A, the cooling performance of the coolant can be maintained for a longer period, and therefore other battery cell assemblies (e.g., second battery cell assemblies 120B to fifth battery cell assemblies 120F) can still be cooled. According to embodiments based on the technical concept of this disclosure, the service life of the coolant can be extended.

[0160] According to embodiments based on the technical concept of this disclosure, even without a separate control device or control signal, the expansion of the blocking member caused by the temperature rise within the sub-flow path can naturally create an effect of blocking the sub-flow path from the main flow path. Therefore, even in the event of a thermal runaway incident where the control device malfunctions or the control signal cannot be transmitted normally, the sub-flow path can be isolated from the main flow path. This allows the coolant's performance to be maintained and its service life extended even during a thermal runaway incident.

[0161] According to exemplary embodiments based on the technical concept of this disclosure, a cooling method S100 for a battery pack with improved performance and reliability can be provided.

[0162] According to exemplary embodiments based on the technical concept of this disclosure, a cooling method S100 for a battery pack with enhanced safety can be provided.

[0163] (Sixth Implementation Method)

[0164] Figure 11 This is a schematic diagram illustrating a vehicle 1000 including a battery pack according to an exemplary embodiment based on the technical concept of this disclosure.

[0165] Reference Figure 11 The 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 embodiments of the present disclosure. The vehicle 1000 may include four-wheeled vehicles and two-wheeled vehicles. According to embodiments of the present disclosure, the vehicle 1000 can operate by receiving power supplied from the battery pack 100.

[0166] As described above, the battery pack 100 may include reference Figures 3 to 6 The blocking members 40 and 50 are described. Therefore, in the event of a thermal runaway event in the battery cell assembly, the sub-flow path below the battery cell assembly can be isolated from the main flow path. Consequently, the cooling performance of the coolant is maintained for a longer period, and the coolant's service life can be extended.

[0167] It is worth noting that even without a separate control device or control signal, the blocking member will naturally expand due to the temperature rise within the sub-flow path, thereby isolating the sub-flow path from the main flow path. Therefore, even during a thermal runaway event where the control device malfunctions or the control signal cannot be transmitted normally, the sub-flow path can still be isolated from the main flow path. This allows for the anticipated maintenance of coolant performance and extended coolant life even during a thermal runaway event.

[0168] According to embodiments based on the technical concept of this disclosure, a vehicle 1000 including a battery pack 100 with enhanced safety can be provided.

[0169] According to embodiments based on the technical concept of this disclosure, a vehicle 1000 including a battery pack 100 with improved performance and reliability can be provided.

[0170] According to embodiments based on the technical concept of this disclosure, a vehicle 1000 with enhanced safety can be provided.

[0171] According to embodiments based on the technical concept of this disclosure, a vehicle 1000 with improved performance and reliability can be provided.

[0172] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, it should be understood that the configurations shown in the drawings or the embodiments described herein are merely one embodiment of the present disclosure and do not represent all the technical ideas of the present disclosure, and various equivalents and modifications may exist at the time of filing this application.

Claims

1. A battery pack housing, the battery pack housing comprising: Base plate, which intersects with the first direction; A cooling channel, located within the base plate, includes sub-flow paths and a main flow path supplying coolant to the sub-flow paths; as well as A blocking member is provided within the sub-flow path, wherein, The blocking member includes a bimetallic portion comprising a first metal and a second metal, the first metal and the second metal having different coefficients of thermal expansion and being arranged along a second direction intersecting the first direction.

2. The battery pack housing according to claim 1, wherein, When a thermal runaway event occurs in a battery cell assembly that overlaps with the sub-flow path in the first direction, the blocking member is configured to close the sub-flow path.

3. The battery pack housing according to claim 1, wherein, The blocking member includes a first state at a first temperature and a second state at a second temperature, wherein... The second temperature is higher than the first temperature, and The length of the bimetallic portion in the second direction in the second state is greater than the length of the bimetallic portion in the second direction in the first state.

4. The battery pack housing according to claim 1, wherein, The blocking member includes a first state at a first temperature and a second state at a second temperature, wherein... The second temperature is higher than the first temperature. In the first state, the sub-path is connected to the main path, and In the second state, the sub-flow path is blocked from the main flow path.

5. The battery pack housing according to claim 4, wherein, In the first state, the coolant is supplied to the sub-flow path, and In the second state, the coolant is not supplied to the sub-flow path.

6. The battery pack housing according to claim 1, wherein, The blocking member further includes a fixing part and a plug part, wherein... When the temperature of the battery cell assembly that overlaps with the sub-flow path in the first direction rises, the relative position of the plug portion with respect to the fixing portion moves in the second direction.

7. The battery pack housing according to claim 6, wherein, The sub-path further includes a connection portion with the main path, wherein... The blocking member is disposed within the connecting portion, and When the temperature of the battery cell assembly rises, the plug portion is configured to contact the inner wall of the connector to close the sub-flow path.

8. The battery pack housing according to claim 1, wherein, The blocking member includes a first state at a first temperature and a second state at a second temperature, wherein... The second temperature is higher than the first temperature. The sub-path also includes a connection portion to the main path. The blocking member is disposed within the connecting portion, wherein... In the first state, the coolant flows into the sub-flow path through the connection, and In the second state, the blocking member blocks the movement of the coolant through the connection.

9. The battery pack housing according to claim 1, wherein, The bimetallic portion includes a first layer and a second layer, each of the first layer and the second layer including a first metal and a second metal, wherein... The second metal of the first layer and the second metal of the second layer are arranged continuously along the second direction.

10. A battery pack, the battery pack comprising: A battery pack housing, the battery pack housing including a base plate; A cooling channel is located within the base plate, and the cooling channel includes a first sub-flow path and a main flow path that supplies coolant to the first sub-flow path; A first battery cell assembly is located on the base plate and overlaps with the first sub-flow path in a first direction; as well as A blocking member is located within the first sub-flow path, wherein... The first battery cell assembly includes a first state at a first temperature and a second state at a second temperature, wherein, The second temperature is higher than the first temperature. The blocking member includes a bimetallic portion comprising a first metal and a second metal, the first metal and the second metal having different coefficients of thermal expansion and arranged along a second direction intersecting the first direction. In the second state of the first battery cell assembly, the blocking member is configured to close the first sub-flow path.

11. The battery pack according to claim 10, wherein, In the first state, the first sub-path is connected to the main path, and In the second state, the first sub-flow path is blocked from the main flow path.

12. The battery pack according to claim 10, wherein, The cooling channel also includes a second sub-flow path, and The battery pack further includes a second battery cell assembly, which overlaps with the second sub-flow path in the first direction. In the first state, the main flow path is connected to the first sub-flow path and the second sub-flow path respectively, and the first sub-flow path is connected to the second sub-flow path through the main flow path. In the second state, the first sub-flow path is blocked from the second sub-flow path.

13. The battery pack according to claim 12, wherein, In the first state, the coolant is supplied from the main flow path to the first sub-flow path, and subsequently from the first sub-flow path through the main flow path to the second sub-flow path, and 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. The battery pack according to claim 10, wherein, The first state is the normal state of the first battery cell assembly, and The second state is the thermal runaway state of the first battery cell assembly.

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