Battery pack and electric vehicle including the same

Abstract

The technical concept of the present invention provides a battery pack comprising: a battery cell block comprising a plurality of battery cells; and a pack case accommodating the battery cell block and including a cooling plate connected to the battery cell block, in which the cooling plate includes: a first cooling channel spaced apart from the battery cell block by a first distance and through which a first cooling fluid flows; and a second cooling channel spaced apart from the battery cell block by a second distance greater than the first distance and through which a second cooling fluid flows, and the first cooling fluid and the second cooling fluid are different from each other.

Description

Technical Field

[0001] This disclosure relates to a battery pack and an electric vehicle including the battery pack.

[0002] This application claims the benefit based on priority of Korean Patent Application No. 10-2023-0141028, filed on October 20, 2023, the entire contents of which are incorporated herein by reference. Background Technology

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are already widely used as a power source for various types of wireless devices, such as mobile phones, laptops, and cordless vacuum cleaners. Recently, the primary use of secondary batteries has shifted from mobile devices to automobiles, as the manufacturing cost per unit capacity has significantly decreased due to increased energy density and economies of scale, and the driving range of battery electric vehicles (BEVs) has increased to the same level as fuel cell vehicles.

[0004] As secondary batteries are used in automobiles, the need for their safety is growing. In the event of an accident, such as a fire, involving a secondary battery used in a car, the driver's life could be endangered; therefore, research into technologies to enhance the safety of secondary batteries is essential. Summary of the Invention

[0005] Technical issues This disclosure aims to provide a battery pack and an electric vehicle including the battery pack.

[0006] Technical solution One aspect of this disclosure provides a battery pack, including: a battery cell block having a plurality of battery cells; and a battery pack housing housing the battery cell block and including a cooling plate connected to the battery cell block, wherein the cooling plate includes: a first cooling channel spaced a first distance from the battery cell block and configured to allow a first cooling fluid to flow therethrough; and a second cooling channel spaced a second distance from the battery cell block and configured to allow a second cooling fluid to flow therethrough, wherein the second distance is greater than the first distance, and the first cooling fluid and the second cooling fluid are different from each other.

[0007] In an exemplary embodiment, the first cooling fluid may be a coolant, and the second cooling fluid may be a refrigerant.

[0008] In an exemplary embodiment, the temperature of the second cooling fluid supplied to the inlet of the second cooling channel may be lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel.

[0009] In an exemplary embodiment, the cooling plate may further include a third cooling plate that is spaced apart from the battery cell block by a third distance greater than the second distance and is configured to allow a third cooling fluid to flow through it.

[0010] In an exemplary embodiment, each of the first cooling fluid and the third cooling fluid may be a coolant, and the second cooling fluid may be a refrigerant.

[0011] In an exemplary embodiment, the temperature of the second cooling fluid supplied to the inlet of the second cooling channel may be lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel and the temperature of the third cooling fluid supplied to the inlet of the third cooling channel.

[0012] In an exemplary embodiment, the first cooling fluid may be a coolant, and each of the second and third cooling fluids may be a refrigerant.

[0013] In an exemplary embodiment, the temperature of the second cooling fluid supplied to the inlet of the second cooling channel and the temperature of the third cooling fluid supplied to the inlet of the third cooling channel may be lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel.

[0014] In an exemplary embodiment, the temperature of the second cooling fluid supplied to the inlet of the second cooling channel may be lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel, and the temperature of the third cooling fluid supplied to the inlet of the third cooling channel may be lower than the temperature of the second cooling fluid supplied to the inlet of the second cooling channel.

[0015] In an exemplary embodiment, the battery pack may further include a thermally conductive adhesive layer between the cooling plate and the individual battery cells.

[0016] In an exemplary embodiment, the cooling plate can support the battery cell block, and the battery pack housing may further include: a sidewall located on the cooling plate; and a top plate attached to the sidewall and covering the battery cell block.

[0017] One aspect of this disclosure provides an electric vehicle, including: a vehicle frame; a battery pack mounted on the vehicle frame; a first cooling device configured to supply a first cooling fluid to the battery pack; and a second cooling device configured to supply a second cooling fluid to the battery pack, wherein the battery pack includes: a battery cell block including a plurality of battery cells; and a battery pack housing housing the battery cell block and including a cooling plate supporting the battery cell block, the cooling plate including: a first cooling channel through which the first cooling fluid supplied from the first cooling device flows; and a second cooling channel disposed below the first cooling channel and configured to through which the second cooling fluid supplied from the second cooling device flows, the first cooling fluid being a coolant and the second cooling fluid being a refrigerant.

[0018] In an exemplary embodiment, the electric vehicle may further include a third cooling device configured to supply a third cooling fluid to the battery pack, and the cooling plate may further include a third cooling channel disposed below the second cooling channel and through which the third cooling fluid supplied from the third cooling device flows.

[0019] In an exemplary embodiment, the third cooling fluid may be a coolant.

[0020] In an exemplary embodiment, the third cooling fluid may be a refrigerant.

[0021] Beneficial effects According to an exemplary embodiment of this disclosure, the cooling plate includes a first cooling channel and a second cooling channel separated from each other in a vertical direction, and is capable of cooling the cell blocks of the battery assembly using a first cooling fluid flowing along the first cooling channel and a second cooling fluid flowing along the second cooling channel, thereby improving cooling capacity. Therefore, the heat generation of the battery pack can be effectively controlled, thereby improving the safety of the battery pack and the electrical devices including the battery pack.

[0022] According to exemplary embodiments of this disclosure, an additional cooling channel for coolant flow can be provided between the individual battery cells and the cooling channel through which the coolant flows. In this case, condensation of the coolant can be prevented, thus allowing the battery pack to be cooled without performing a defrosting operation.

[0023] The effects achievable by the exemplary embodiments of this disclosure are not limited to those described above, and those skilled in the art to which the exemplary embodiments of this disclosure pertain will clearly derive and understand other effects not described herein from the following description. In other words, those skilled in the art can deduce from the exemplary embodiments of this disclosure unintended effects when implementing the exemplary embodiments of this disclosure. Attached Figure Description

[0024] Figure 1 This is a perspective view of a battery pack according to an exemplary embodiment of the present disclosure.

[0025] Figure 2 It is along Figure 1 A cross-sectional view of a portion of the battery pack taken by line AA-AA'.

[0026] Figure 3 It is along Figure 1 A cross-sectional view of a portion of the battery pack taken by line BB-BB'.

[0027] Figure 4 and Figure 5 This is a cross-sectional view of a battery pack according to an exemplary embodiment of the present disclosure.

[0028] Figure 6 This is a schematic diagram of an electric vehicle in which a battery pack is installed, according to an exemplary embodiment of the present disclosure. Detailed Implementation

[0029] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present disclosure, the terms or expressions used in this specification and claims should not be construed as limited to terms or expressions as commonly understood or defined in common dictionaries, but should be understood based on the principle that the inventors of this application may appropriately define the terms or expressions to best interpret the present disclosure according to the meanings and concepts corresponding to the present disclosure.

[0030] Therefore, the configurations shown in the embodiments and accompanying drawings described herein are merely examples of this disclosure and do not reflect all the technical concepts of this disclosure. It should be understood that various equivalents and modifications have been made to replace this configuration as of the filing date of this application.

[0031] When it is determined that a known configuration or function related to the description of this disclosure obscures the subject matter of this disclosure due to unnecessary detail, such configuration or function will not be described in detail.

[0032] Because embodiments of this disclosure are provided to illustrate the disclosure more fully to those skilled in the art, the shapes, dimensions, etc., of the components shown in the drawings may be shown enlarged, omitted, or schematically for clarity. Therefore, it should not be construed that the dimensions or proportions of the components fully reflect their actual dimensions or proportions.

[0033] (First embodiment) Figure 1 This is a perspective view of a battery pack 10 according to an exemplary embodiment of the present disclosure. Figure 2 It is along Figure 1 A cross-sectional view of a portion of battery pack 10 taken by line AA-AA'. Figure 3 It is along Figure 1 A cross-sectional view of a portion of battery pack 10 taken by line BB-BB'.

[0034] Reference Figures 1 to 3 The battery pack 10 may include a battery pack housing 200 and battery components 100 mounted in the battery pack housing 200. The battery pack 10 may include one or more battery components 100 in the battery pack housing 200. In an exemplary embodiment, the battery pack 10 may include a plurality of battery components 100 arranged in a first direction (e.g., the X-axis direction) and a second direction (e.g., the Y-axis direction).

[0035] The battery assembly 100 may include a battery cell block 110 containing a plurality of battery cells 111.

[0036] Each battery cell 111 is a basic unit of a lithium-ion battery (i.e., a secondary battery). Each battery cell 111 may include an electrode assembly, an electrolyte, and a battery cell casing. The electrode assembly in the battery cell casing may include a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. Depending on the assembly configuration, the electrode assembly may be a wound electrode assembly or a stacked electrode assembly. A wound electrode assembly may include a structure in which a positive electrode, a negative electrode, and a separator located between the positive and negative electrodes are wound together. A stacked electrode assembly may include multiple positive electrodes and multiple negative electrodes stacked sequentially, with multiple separators located between them. The positive electrode may include a positive electrode current collector and a positive electrode active material. The negative electrode may include a negative electrode current collector and a negative electrode active material.

[0037] Multiple battery cells 111 can be connected in series and / or in parallel. For example, multiple battery cells 111 can be connected in series with each other. For example, multiple battery cells 111 can be connected in parallel with each other. For example, when a set of two or more battery cells 111 connected in parallel is defined as a group, a group including two or more battery cells 111 connected in parallel and another group including two or more battery cells 111 connected in parallel can be connected in series.

[0038] Each battery cell 111 can be a pouch cell, a cylindrical cell, or a prismatic cell. The electrode assembly of a pouch cell is embedded in a pouch housing comprising an aluminum laminate. The electrode assembly of a cylindrical cell is embedded in a cylindrical metal can. The electrode assembly of a prismatic cell is embedded in a prismatic metal can.

[0039] In an exemplary embodiment, the battery cell 111 may be a pouch cell and is stacked together in a battery assembly 100 in a second direction (e.g., the Y-axis direction). In an exemplary embodiment, in each battery assembly 100, a plurality of battery cells 111 may be pouch cells whose length in the second direction (e.g., the Y-axis direction) is less than their length in the first direction (e.g., the X-axis direction) and are stacked in the second direction (e.g., the Y-axis direction).

[0040] When viewed in a plan view, the battery cell block 110 may have a rectangular shape. The battery cell block 110 may include a front surface and a rear surface that are opposite each other in a first direction (e.g., the X-axis direction), two sides (i.e., the first side and the second side) that are opposite each other in a second direction (e.g., the Y-axis direction), and an upper surface and a lower surface that are opposite each other in a vertical direction (e.g., the Z-axis direction).

[0041] The busbar frame on which the busbars are mounted can be located on each of the front and rear surfaces of the battery cell block 110. Multiple busbars can be mounted on the busbar frame on the front surface of the battery cell block 110, and multiple busbars can be mounted on the busbar frame on the rear surface of the battery cell block 110.

[0042] Busbars can be connected to the electrode leads of battery cells 111. For example, busbars can be soldered to the electrode leads of battery cells 111. For example, each busbar can be an intermediate busbar connected to the electrode leads of different battery cells 111 belonging to battery cell block 110 to electrically connect the different battery cells 111. For example, each busbar can be a terminal busbar for electrically connecting battery cell block 110 to another battery cell block 110 or battery device.

[0043] The battery pack housing 200 provides a receiving space for accommodating the battery assembly 100. The battery pack housing 200 may include a base plate 210, sidewalls 221, and a top plate 223. The base plate 210 may have a flat plate shape parallel to a first direction (e.g., the X-axis direction) and a second direction (e.g., the Y-axis direction). The base plate 210 may support the battery assembly 100. The sidewalls 221 may be attached to an edge portion of the base plate 210 and extend in a vertical direction (e.g., the Z-axis direction). The sidewalls 221 may extend along the periphery of the base plate 210 and surround the battery assembly 100. The top plate 223 may be on the sidewalls 221. The top plate 223 may be a battery pack cover attached to the sidewalls 221 to cover the battery assembly 100.

[0044] The base plate 210 of the battery pack housing 200 may include cooling channels configured for the flow of cooling fluid and may be configured to cool the cell blocks 110 of the battery assembly 100. In this disclosure, the base plate 210 may be referred to as a cooling plate. Cooling fluid supplied from outside the battery pack 10 may be supplied to the inlet of the cooling channels, flow along the cooling channels, and be discharged to the outside through the outlet of the cooling channels. As the cooling fluid flows along the cooling channels, it can cool the cell blocks 110 of the battery assembly 100. The cooling fluid may contain a coolant and / or a refrigerant.

[0045] The refrigerant can be a phase-change refrigerant configured to undergo a phase change between a liquid and a gaseous state when used in a cooling device for the battery pack 10. The cooling device configured to circulate the refrigerant to cool the battery pack 10 provides a refrigeration cycle including a compressor, a condenser, an expansion valve, and an evaporator, and the refrigerant is configured to absorb heat from the battery pack 10 while circulating in the cooling cycle provided by the cooling device. In the refrigeration cycle, the battery pack 10, which has a heat load, can constitute the evaporator of the refrigeration cycle. The coolant can be a liquid material that does not undergo a phase change when used in a cooling device for the battery pack 10. The cooling device configured to circulate the coolant to cool the battery pack 10 can include a cooler for cooling the coolant.

[0046] In an exemplary embodiment, the base plate 210 may include a first cooling channel 211 and a second cooling channel 213 that are separated from each other in a vertical direction (e.g., the Z-axis direction). The first cooling channel 211 and the second cooling channel 213 may be spaced apart from each other in a vertical direction (e.g., the Z-axis direction) to form a multi-layer cooling channel. The first cooling channel 211 and the second cooling channel 213 may overlap each other in a vertical direction (e.g., the Z-axis direction). The first cooling channel 211 may be located between the battery cell block 110 and the second cooling channel 213. In other words, the first cooling channel 211 may be spaced apart from the battery cell block 110 by a first distance, and the second cooling channel 213 may be spaced apart from the battery cell block 110 by a second distance greater than the first distance. The first cooling channel 211 and the second cooling channel 213 are not connected to each other and are separated from each other, and the first cooling fluid F1 supplied to the first cooling channel 211 and the second cooling fluid F2 supplied to the second cooling channel 213 do not mix.

[0047] In an exemplary embodiment, the base plate 210 can be formed by an extrusion process, and a portion of the base plate 210, including the first cooling channel 211 and the second cooling channel 213 that overlap each other perpendicularly, can be a separate component.

[0048] In an exemplary embodiment, a thermally conductive adhesive layer 120 may be inserted between the battery cell block 110 and the base plate 210. The thermally conductive adhesive layer 120 can thermally and physically connect the battery cell block 110 and the base plate 210. The thermally conductive adhesive layer 120 may include a resin and a thermally conductive filler contained in the resin. For example, the thermally conductive adhesive layer 120 may include a thermal interface material (TIM).

[0049] The first cooling device 310 can supply a first cooling fluid F1 to the first cooling channel 211. The first cooling device 310 can be configured as an external electrical device of the battery pack 10 (e.g., an electric vehicle). Alternatively, the first cooling device 310 can be included within the battery pack 10. A first inlet pipe 231 connected to the inlet of the first cooling channel 211 and a first outlet pipe 233 connected to the outlet of the first cooling channel 211 can be installed on one side of the base plate 210. The first cooling device 310 can be connected to the first inlet pipe 231 via a supply pipe and to the first outlet pipe 233 via a return pipe. The first cooling device 310 can supply a first cooling fluid F1 at a predetermined temperature to the first cooling channel 211. The first cooling fluid F1 supplied from the first cooling device 310 is supplied to the inlet of the first cooling channel 211 via the first inlet pipe 231. When the first cooling fluid F1 flows from the inlet of the first cooling channel 211 to its outlet, the battery cell 110 can be cooled by heat exchange between the first cooling fluid F1 and the battery cell 110. The first cooling fluid F1 discharged from the outlet of the first cooling channel 211 can be recovered to the first cooling device 310 through the first outflow pipe 233 and the recovery pipe.

[0050] The second cooling device 320 can supply the second cooling fluid F2 to the second cooling channel 213. The second cooling device 320 can be configured as an external electrical device (e.g., an electric vehicle) of the battery pack 10. Alternatively, the second cooling device 320 can be included within the battery pack 10. A second inflow pipe 241 connected to the inlet of the second cooling channel 213 and a second outflow pipe 243 connected to the outlet of the second cooling channel 213 can be installed on one side of the base plate 210. The second cooling device 320 can be connected to the second inflow pipe 241 via a supply pipe and to the second outflow pipe 243 via a return pipe. The second cooling device 320 can supply the second cooling fluid F2 at a predetermined temperature to the second cooling channel 213. The second cooling fluid F2 supplied from the second cooling device 320 is supplied to the inlet of the second cooling channel 213 via the second inflow pipe 241. When the second cooling fluid F2 flows from the inlet of the second cooling channel 213 to its outlet, the battery cell 110 can be cooled by heat exchange between the second cooling fluid F2 and the battery cell 110. The second cooling fluid F1 discharged from the outlet of the second cooling channel 213 can be recovered to the second cooling device 320 through the second outflow pipe 243 and the recovery pipe.

[0051] In an exemplary embodiment, the first cooling fluid F1 flowing along the first cooling channel 211 may be different from the second cooling fluid F2 flowing along the second cooling channel 213. In an exemplary embodiment, the first cooling fluid F1 may be a coolant, and the second cooling fluid F2 may be a refrigerant. In this case, the second cooling device 320 providing the second cooling fluid F2 may include elements that operate a refrigeration cycle using a refrigerant configured for phase change.

[0052] In an exemplary embodiment, the supply temperature of the second cooling fluid F2 supplied to the inlet of the second cooling channel 213 may be lower than the supply temperature of the first cooling fluid F1 supplied to the inlet of the first cooling channel 211. In this case, the cooling capacity of the cooling system using the relatively low-temperature second cooling fluid F2 may be greater than the cooling capacity of the cooling system using the relatively high-temperature first cooling fluid F1.

[0053] According to an exemplary embodiment of this disclosure, the cooling plate includes a first cooling channel 211 and a second cooling channel 213 separated from each other in a vertical direction (e.g., the Z-axis direction), and the battery cell blocks 110 of the battery assembly 100 can be cooled using a first cooling fluid F1 flowing along the first cooling channel 211 and a second cooling fluid F2 flowing along the second cooling channel 213, thereby improving the cooling capacity. Therefore, the temperature rise of the battery pack 10 can be effectively controlled, thereby improving the safety of the battery pack 10 and the electrical devices including the battery pack 10.

[0054] In the case of the battery pack 10 according to the comparative example, the cooling plate may only include cooling channels through which the refrigerant flows. In this case, when cooling is performed using only refrigerant, the individual battery cells 110 may be cooled to extremely low temperatures, or a defrosting operation may be required to remove condensation that forms around the cooling plate due to the low temperature of the refrigerant.

[0055] According to an exemplary embodiment of this disclosure, a first cooling channel 211 through which coolant flows may be disposed between the battery cell block 110 and a second cooling channel 213 through which coolant flows. In this case, condensation of the coolant can be prevented, thus allowing the battery pack 10 to be cooled without performing a defrosting operation.

[0056] (Second Embodiment) Figure 4 and Figure 5 This is a cross-sectional view of a battery pack according to an exemplary embodiment of the present disclosure. Figure 4 It is along Figure 1 A cross-sectional view of the battery pack taken by line AA-AA', and Figure 5 It is along Figure 1 The cross-sectional view of the battery pack taken by line BB-BB'. In the following text, the focus will be on the reference above. Figures 1 to 3 The differences described in the battery pack 10 are used to describe Figure 4 and Figure 5 The battery pack shown in the image.

[0057] Reference Figure 4 and Figure 5 The base plate 210A of the battery pack housing 200 may include a first cooling channel 211, a second cooling channel 213, and a third cooling channel 215 that are separated from each other in a vertical direction (e.g., the Z-axis direction). The third cooling channel 215 may overlap with the first cooling channel 211 and the second cooling channel 213 in the vertical direction (e.g., the Z-axis direction). The third cooling channel 215 may be located below the second cooling channel 213. The second cooling channel 213 may be spaced apart from the battery cell block 110 by a second distance, and the third cooling channel 215 may be spaced apart from the battery cell block 110 by a third distance greater than the second distance. The third cooling channel 215 is separated from the first cooling channel 211 and the second cooling channel 213, and the third cooling fluid supplied to the third cooling channel 215 does not mix with the first cooling fluid in the first cooling channel 211 and the second cooling fluid in the second cooling channel 213. In an exemplary embodiment, the base plate 210A can be formed by an extrusion process, and a portion of the base plate 210A, including the first cooling channel 211, the second cooling channel 213, and the third cooling channel 215 that overlap each other perpendicularly, can be a separate component.

[0058] The third cooling device 330 can supply a third cooling fluid to the third cooling channel 215. The third cooling device 330 can be configured as an external electrical device of the battery pack (e.g., an electric vehicle). Alternatively, the third cooling device 330 can be included within the battery pack. A third inlet pipe connected to the inlet of the third cooling channel 215 and a third outlet pipe connected to the outlet of the third cooling channel 215 can be installed on one side of the base plate 210A. The third cooling device 330 can be connected to the third inlet pipe via a supply pipe and to the third outlet pipe via a recovery pipe. The third cooling device 330 can supply a third cooling fluid at a predetermined temperature to the third cooling channel 215. The third cooling fluid supplied from the third cooling device 330 is supplied to the inlet of the third cooling channel 215 via the third inlet pipe. As the third cooling fluid flows from the inlet to the outlet of the third cooling channel 215, the battery cell 110 can be cooled through heat exchange between the third cooling fluid and the battery cell 110, and the third cooling fluid discharged from the outlet of the third cooling channel 215 can be recovered to the third cooling device 330 via the third outlet pipe and the recovery pipe. The third cooling fluid can be a coolant or a refrigerant. When the third cooling fluid is a refrigerant, the third cooling device 330 that provides the third cooling fluid may include elements that operate the refrigeration cycle using a refrigerant configured for phase change.

[0059] In an exemplary embodiment, each of the first cooling fluid and the third cooling fluid may be a coolant, and the second cooling fluid may be a refrigerant.

[0060] In an exemplary embodiment, the first cooling fluid may be a coolant, and each of the second and third cooling fluids may be a refrigerant.

[0061] In an exemplary embodiment, each of the first cooling fluid and the second cooling fluid may be a coolant, and the third cooling fluid may be a refrigerant.

[0062] In an exemplary embodiment, the supply temperature of the second cooling fluid supplied to the inlet of the second cooling channel 213 may be lower than the supply temperature of the first cooling fluid supplied to the inlet of the first cooling channel 211 and the supply temperature of the third cooling fluid supplied to the inlet of the third cooling channel 215.

[0063] In an exemplary embodiment, the supply temperature of the second cooling fluid supplied to the inlet of the second cooling channel 213 and the supply temperature of the third cooling fluid supplied to the inlet of the third cooling channel 215 may be lower than the supply temperature of the first cooling fluid supplied to the inlet of the first cooling channel 211.

[0064] In an exemplary embodiment, the supply temperature of the second cooling fluid supplied to the inlet of the second cooling channel 213 may be lower than the supply temperature of the first cooling fluid supplied to the inlet of the first cooling channel 211, and the supply temperature of the third cooling fluid supplied to the inlet of the third cooling channel 215 may be lower than the supply temperature of the second cooling fluid supplied to the inlet of the second cooling channel 213.

[0065] According to an exemplary embodiment of the present disclosure, the cooling plate includes a first cooling channel 211, a second cooling channel 213, and a third cooling channel 215 that are separated from each other in a vertical direction (e.g., the Z-axis direction), and the battery cell blocks 110 of the battery assembly 100 can be cooled by using a first cooling fluid, a second cooling fluid, and a third cooling fluid flowing along the first cooling channel 211, the second cooling channel 213, and the third cooling channel 215, thereby improving the cooling capacity.

[0066] According to an exemplary embodiment of the present disclosure, a first cooling channel 211 through which coolant flows is provided between the battery cell block 110 and a second cooling channel 213 through which refrigerant flows, thereby using refrigerant to prevent condensation and thus cooling the battery pack without performing a defrosting operation.

[0067] (Third embodiment) Figure 6This is a schematic diagram of an electric vehicle 1000 in which a battery pack 1100 is installed, according to an exemplary embodiment of the present disclosure.

[0068] For the sake of simplicity, in Figure 6 The diagram does not show some components of the electric vehicle 1000, but shows a portion of the body frame 1200 forming the lower frame of the vehicle, as well as a battery pack 1100, tires, and a cooling system 1300 mounted on the body frame 1200. The battery pack 1100 may be located below the passenger compartment. For example, the battery pack 1100 may include components as shown above. Figures 1 to 3 The battery pack described above, or the reference above, is 10. Figure 4 and Figure 5 The battery pack described. Cooling device 1300 can provide cooling fluid to a cooling plate on the battery pack housing for cooling the battery pack 1100. Cooling device 1300 may include multiple means for providing different types of cooling fluid. In an exemplary embodiment, cooling device 1300 may include the above-described... Figures 1 to 3 The first cooling device 310 and the second cooling device 320 are described. In an exemplary embodiment, the cooling device 1300 may include the above-described cooling device. Figure 4 and Figure 5 The first cooling device 310, the second cooling device 320 and the third cooling device 330 are described.

[0069] According to exemplary embodiments of this disclosure, the heat generation of the battery pack 1100 can be effectively controlled by improving the cooling capacity of the cooling system of the battery pack 1100. Therefore, the safety and durability of the battery pack 1100 and the electric vehicle 1000 including the battery pack 1100 can be improved.

[0070] The present disclosure has been described in more detail above with reference to the accompanying drawings, embodiments, etc. However, the configurations shown in the drawings or embodiments described in this disclosure are merely embodiments of the present disclosure and do not reflect all the technical concepts of the present disclosure. Therefore, it should be understood that various equivalents and modifications have been made to replace the configurations as of the filing date of this application.

Claims

1. A battery pack, comprising: A battery cell block, comprising multiple battery cells; as well as The battery pack housing accommodates the individual battery cells and includes a cooling plate connected to the individual battery cells. The cooling plate includes: A first cooling channel, spaced a first distance from the battery cell block and configured to allow a first cooling fluid to flow through it; and A second cooling channel, spaced a second distance from the battery cell block and configured to allow a second cooling fluid to flow through it, wherein the second distance is greater than the first distance, and The first cooling fluid and the second cooling fluid are different from each other.

2. The battery pack according to claim 1, wherein: The first cooling fluid contains a coolant, and The second cooling fluid contains a refrigerant.

3. The battery pack according to claim 1, wherein, The temperature of the second cooling fluid supplied to the inlet of the second cooling channel is lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel.

4. The battery pack according to claim 1, wherein, The cooling plate also includes a third cooling plate spaced a third distance from the battery cell block and configured to allow a third cooling fluid to flow through it, wherein the third distance is greater than the second distance.

5. The battery pack according to claim 4, wherein: Each of the first cooling fluid and the third cooling fluid contains a coolant, and The second cooling fluid contains a refrigerant.

6. The battery pack according to claim 4, wherein, The temperature of the second cooling fluid supplied to the inlet of the second cooling channel is lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel and the temperature of the third cooling fluid supplied to the inlet of the third cooling channel.

7. The battery pack according to claim 4, wherein: The first cooling fluid contains a coolant, and Each of the second cooling fluid and the third cooling fluid contains a refrigerant.

8. The battery pack according to claim 4, wherein, The temperature of the second cooling fluid supplied to the inlet of the second cooling channel and the temperature of the third cooling fluid supplied to the inlet of the third cooling channel are respectively lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel.

9. The battery pack according to claim 4, wherein: The temperature of the second cooling fluid supplied to the inlet of the second cooling channel is lower than the temperature of the first cooling fluid supplied to the inlet of the first cooling channel, and The temperature of the third cooling fluid supplied to the inlet of the third cooling channel is lower than the temperature of the second cooling fluid supplied to the inlet of the second cooling channel.

10. The battery pack according to claim 1, further comprising a thermally conductive adhesive layer between the cooling plate and the battery cell block.

11. The battery pack according to claim 1, wherein: The cooling plate supports the battery cell block, and The battery pack casing also includes: Sidewall, located on the cooling plate; and The top plate is attached to the sidewall and covers the battery cell block.

12. An electric vehicle, comprising: Vehicle body frame; The battery pack is mounted on the vehicle body frame; A first cooling device is configured to supply a first cooling fluid to the battery pack; as well as A second cooling device is configured to supply a second cooling fluid to the battery pack. The battery pack includes: A battery cell block, comprising multiple battery cells; and The battery pack housing includes the individual battery cells and a cooling plate that supports the individual battery cells. The cooling plate includes: A first cooling passage through which the first cooling fluid supplied from the first cooling device flows; and A second cooling channel is disposed below the first cooling channel and configured to allow the second cooling fluid supplied from the second cooling device to flow through it. The first cooling fluid contains a coolant, and the second cooling fluid contains a refrigerant.

13. The electric vehicle according to claim 12, further comprising: A third cooling device is configured to supply a third cooling fluid to the battery pack, and The cooling plate further includes a third cooling channel disposed below the second cooling channel and through which the third cooling fluid supplied from the third cooling device flows.

14. The electric vehicle according to claim 13, wherein, The third cooling fluid contains a coolant.

15. The electric vehicle according to claim 13, wherein, The third cooling fluid contains a refrigerant.

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