Battery pack and electric vehicle including same

Abstract

The technical idea of ​​the present invention provides a battery pack including a cell block including a plurality of battery cells, and a pack housing that houses the cell block and includes a cooling plate connected to the cell block, wherein the cooling plate includes a first cooling channel located at a first distance from the cell block and through which a first cooling fluid flows, and a second cooling channel located at a second distance from the cell block that is greater than the first distance and through which a second cooling fluid flows, and wherein the first cooling fluid and the second cooling fluid are different from each other.

Description

[Technical Field]

[0001] The present invention relates to a battery pack and an electric vehicle including the same.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0141028, filed on October 20, 2023, and all contents disclosed in the documents of this Korean patent application are incorporated herein by reference. [Background technology]

[0003] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as energy sources for a variety of wireless devices, such as handsets, laptops, and wireless vacuum cleaners. In recent years, improvements in energy density and economies of scale have dramatically reduced the manufacturing cost per unit capacity of secondary batteries. As the driving range of battery electric vehicles (BEVs) has increased to the same level as fuel-powered vehicles, the primary use of secondary batteries has shifted from mobile devices to mobility.

[0004] As secondary batteries are used in mobility, there is a growing demand for their safety. Research into technologies to improve the safety of secondary batteries is essential, as a fire or other accident involving a secondary battery used in mobility could put the driver's life at risk. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem that the present invention aims to achieve is to provide a battery pack and an electric vehicle including the same. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the technical idea of ​​the present invention provides a battery pack including a cell block including a plurality of battery cells, and a pack housing that accommodates the cell block and includes a cooling plate connected to the cell block, wherein the cooling plate includes a first cooling channel located at a first distance from the cell block and through which a first cooling fluid flows, and a second cooling channel located at a second distance from the cell block that is 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.

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

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

[0009] In an exemplary embodiment, the cooling plate is at a third distance from the cell block that is greater than the second distance, and further includes a third cooling channel through which a third cooling fluid flows.

[0010] In an exemplary embodiment, the first cooling fluid and the third cooling fluid are cooling water, and the second cooling fluid is a refrigerant.

[0011] In an exemplary embodiment, 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.

[0012] In an exemplary embodiment, the first cooling fluid is cooling water, and the second cooling fluid and the third cooling fluid are refrigerants.

[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 are each 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 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.

[0015] In an exemplary embodiment, the semiconductor device further includes a thermally conductive adhesive layer interposed between the cooling plate and the cell block.

[0016] In an exemplary embodiment, the cooling plate supports the cell block, and the pack housing further includes a sidewall on the cooling plate and a top plate coupled onto the sidewall to cover the cell block.

[0017] In order to solve the above-mentioned problems, the technical idea of ​​the present invention provides an electric vehicle including a body frame, a battery pack mounted on the body frame, a first cooling device that supplies a first cooling fluid to the battery pack, and a second cooling device that supplies a second cooling fluid to the battery pack, wherein the battery pack includes a cell block including a plurality of battery cells, and a pack housing including a cooling plate that accommodates and supports the cell block, wherein the cooling plate includes a first cooling channel through which the first cooling fluid supplied from the first cooling device flows, and a second cooling channel located below the first cooling channel through which the second cooling fluid supplied from the second cooling device flows, wherein the first cooling fluid is a coolant, and the second cooling fluid is a refrigerant.

[0018] In an exemplary embodiment, the battery pack further includes a third cooling device that supplies a third cooling fluid to the battery pack, and the cooling plate further includes a third cooling channel located 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 is cooling water.

[0020] In an exemplary embodiment, the third cooling fluid is a refrigerant. [Effects of the Invention]

[0021] According to an exemplary embodiment of the present invention, a cooling plate includes a first cooling channel and a second cooling channel separated vertically, and the first cooling fluid flowing along the first cooling channel and the second cooling fluid flowing along the second cooling channel can be used to cool the cell blocks of the battery assembly, thereby improving the cooling capacity, thereby effectively controlling heat generation in the battery pack and ultimately improving the safety of the battery pack and the electrical device including the battery pack.

[0022] According to an exemplary embodiment, another cooling channel through which coolant flows may be provided between the cell block and the cooling channel through which the refrigerant flows. In this case, the coolant can prevent condensation and cool the battery pack without requiring a separate defrosting operation.

[0023] The effects that can be obtained from the exemplary embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood from the following description by a person having ordinary skill in the art to which the exemplary embodiments of the present disclosure belong. In other words, unintended effects accompanying the implementation of the exemplary embodiments of the present disclosure can also be derived from the exemplary embodiments of the present disclosure by a person having ordinary skill in the art. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view of a battery pack according to an exemplary embodiment of the present invention. [Figure 2] 2 is a cross-sectional view showing a part of the battery pack taken along line AA-AA' in FIG. [Figure 3] 2 is a cross-sectional view showing a part of the battery pack taken along line BB-BB' in FIG. [Figure 4] 1 is a cross-sectional view illustrating a battery pack according to an exemplary embodiment of the present invention. [Figure 5] 1 is a cross-sectional view illustrating a battery pack according to an exemplary embodiment of the present invention. [Figure 6] 1 is a schematic diagram illustrating an electric vehicle equipped with a battery pack according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, it should be noted that the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term to best describe his / her invention.

[0026] Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent the entire technical idea of ​​the present invention, and there may be various equivalents and modifications that can replace them at the time of this application.

[0027] Furthermore, in the description of the present invention, if it is determined that a specific description of related publicly known configurations or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0028] The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and therefore the shapes and sizes of components in the drawings may be exaggerated, omitted, or shown in a schematic manner for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0029] (First embodiment) Fig. 1 is a perspective view showing a battery pack 10 according to an exemplary embodiment of the present invention. Fig. 2 is a cross-sectional view showing a portion of the battery pack 10 taken along line AA-AA' in Fig. 1. Fig. 3 is a cross-sectional view showing a portion of the battery pack 10 taken along line BB-BB' in Fig. 1.

[0030] 1 to 3, battery pack 10 may include a pack housing 200 and battery assemblies 100 mounted in pack housing 200. Battery pack 10 may include one or more battery assemblies 100 mounted in pack housing 200. In an exemplary embodiment, battery pack 10 may include a plurality of battery assemblies 100 arranged in a first direction (e.g., X direction) and a second direction (e.g., Y direction).

[0031] The battery assembly 100 may include a cell block 110 containing a plurality of battery cells 111 .

[0032] Each battery cell 111 is a basic unit of a lithium-ion battery, i.e., a secondary battery. Each battery cell 111 can include an electrode assembly, an electrolyte, and a cell case. The electrode assembly housed in the cell case can include a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. The electrode assembly can be either a jelly roll type or a stack type depending on the assembly form. A jelly roll type electrode assembly can include a rolled structure of a positive electrode, a negative electrode, and a separator interposed therebetween. A stack type electrode assembly can include multiple positive electrodes, multiple negative electrodes, and multiple separators interposed therebetween, stacked in sequence. The positive electrode can include a positive electrode current collector and a positive electrode active material. The negative electrode can include a negative electrode current collector and a negative electrode active material.

[0033] The plurality of battery cells 111 may be connected in series and / or parallel. For example, the plurality of battery cells 111 may be connected in series with each other. For example, the plurality of battery cells 111 may be connected in parallel with each other. For example, when a set of two or more battery cells 111 connected in parallel with each other is defined as a bank, one bank consisting of two or more battery cells 111 connected in parallel with each other and another bank consisting of two or more battery cells 111 connected in parallel with each other may be connected in series.

[0034] Each battery cell 111 can be a pouch-type battery cell, a cylindrical battery cell, or a prismatic battery cell. The electrode assembly of a pouch-type battery cell is housed in a pouch case including an aluminum laminate sheet. The electrode assembly of a cylindrical battery cell is housed in a cylindrical metal can. The electrode assembly of a prismatic battery cell is housed in a prismatic metal can.

[0035] In an exemplary embodiment, each battery cell 111 corresponds to a pouch-type battery cell, and multiple battery cells 111 may be stacked on top of each other in a second direction (e.g., the Y direction) within one battery assembly 100. In an exemplary embodiment, each battery cell 111 in each battery assembly 100 corresponds to a pouch-type battery cell whose length along the second direction (e.g., the Y direction) is shorter than its length along the first direction (e.g., the X direction), and multiple battery cells 111 may be stacked on top of each other in the second direction (e.g., the Y direction).

[0036] In a plan view, the cell block 110 may have a rectangular shape. The cell block 110 may have a front surface and a back surface opposite each other in a first direction (e.g., the X direction), two side surfaces (i.e., a first side surface and a second side surface) opposite each other in a second direction (e.g., the Y direction), and a top surface and a bottom surface opposite each other in a vertical direction (e.g., the Z direction).

[0037] A busbar frame on which busbars are mounted may be disposed on each of the front and rear surfaces of the cell block 110. A plurality of busbars may be mounted on the busbar frame on the front surface of the cell block 110, and a plurality of busbars may be mounted on the busbar frame on the rear surface of the cell block 110.

[0038] The bus bars may be coupled to the electrode leads of the battery cells 111. For example, the bus bars may be coupled to the electrode leads of the battery cells 111 by welding. For example, each bus bar may be coupled to an electrode lead coupled to different battery cells 111 belonging to the cell block 110, and may be an inter-bus bar for electrically coupling the different battery cells 111. For example, each bus bar may be a terminal bus bar for electrically coupling the cell block 110 to another cell block 110 or another battery device.

[0039] The pack housing 200 may provide an accommodation space in which the battery assembly 100 is accommodated. The pack housing 200 may include a bottom plate 210, side walls 221, and a top plate 223. The bottom plate 210 may have a flat plate shape parallel to a first direction (e.g., the X direction) and a second direction (e.g., the Y direction). The bottom plate 210 may support the battery assembly 100. The side walls 221 may be coupled to an edge of the bottom plate 210 and extend in a vertical direction (e.g., the Z direction). The side walls 221 may extend along the edge of the bottom plate 210 to surround the battery assembly 100. The top plate 223 may be disposed on the side walls 221. The top plate 223 may be a pack lid coupled to the side walls 221 to cover the battery assembly 100.

[0040] The bottom plate 210 of the pack housing 200 may include cooling channels configured to allow a cooling fluid to flow therethrough and may be configured to cool the cell blocks 110 of the battery assembly 100. In the present disclosure, the bottom plate 210 may be referred to as a cooling plate. A cooling fluid provided from outside the battery pack 10 may be supplied to an inlet of the cooling channel, flow along the cooling channel, and be discharged to the outside through an outlet of the cooling channel. While the cooling fluid flows along the cooling channel, the cell blocks 110 of the battery assembly 100 may be cooled. The cooling fluid may include a coolant and / or a refrigerant.

[0041] The refrigerant may refer to a phase-change refrigerant configured to change phase between a liquid state and a gas state while being used in a cooling device for the battery pack 10. A cooling device configured to circulate a 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 having a heat load may constitute the evaporator of the refrigeration cycle. The coolant may refer to a liquid substance that does not change phase while being used in a cooling device for the battery pack 10. A cooling device configured to circulate coolant to cool the battery pack 10 may include a chiller for cooling the coolant.

[0042] In an exemplary embodiment, the bottom plate 210 may include a first cooling channel 211 and a second cooling channel 213 separated in a vertical direction (e.g., Z direction). The first cooling channel 211 and the second cooling channel 213 may be separated in a vertical direction (e.g., Z direction) to form a multi-layered cooling channel. The first cooling channel 211 and the second cooling channel 213 may overlap in a vertical direction (e.g., Z direction). The first cooling channel 211 may be located between the cell block 110 and the second cooling channel 213. In other words, the first cooling channel 211 may be at a first distance from the cell block 110, and the second cooling channel 213 may be at a second distance from the cell block 110 that is greater than the first distance. The first cooling channel 211 and the second cooling channel 213 are separated and not connected to 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 are not mixed.

[0043] In an exemplary embodiment, the bottom plate 210 can be formed by an extrusion process, and the portion of the bottom plate 210 having the vertically stacked first cooling channel 211 and second cooling channel 213 can be a single piece.

[0044] In an exemplary embodiment, a thermally conductive adhesive layer 120 may be interposed between the cell block 110 and the bottom plate 210. The thermally conductive adhesive layer 120 may provide a thermal and physical connection between the cell block 110 and the bottom plate 210. The thermally conductive adhesive layer 120 may include a resin and a thermally conductive filler contained in the resin. The thermally conductive adhesive layer 120 may include, for example, a thermal interface material (TIM).

[0045] The first cooling device 310 may supply a first cooling fluid F1 to the first cooling channel 211. The first cooling device 310 may be provided to an electric device (e.g., an electric vehicle) external to the battery pack 10. Alternatively, the first cooling device 310 may be included in the battery pack 10. A first inlet pipe 231 connected to an inlet of the first cooling channel 211 and a first outlet pipe 233 connected to an outlet of the first cooling channel 211 may be attached to one side of the bottom plate 210. The first cooling device 310 may 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 may supply a first cooling fluid F1 having a predetermined temperature to the first cooling channel 211. The first cooling fluid F1 provided from the first cooling device 310 is supplied to the inlet of the first cooling channel 211 through the first inlet pipe 231. While the first cooling fluid F1 flows from the inlet to the outlet of the first cooling channel 211, the cell block 110 is cooled by heat exchange between the first cooling fluid F1 and the cell block 110, and the first cooling fluid F1 discharged from the outlet of the first cooling channel 211 can be recovered in the first cooling device 310 through the first outflow pipe 233 and the recovery piping.

[0046] The second cooling device 320 may supply a second cooling fluid F2 to the second cooling channel 213. The second cooling device 320 may be provided to an electric device (e.g., an electric vehicle) external to the battery pack 10. Alternatively, the second cooling device 320 may be included in the battery pack 10. A second inlet pipe 241 connected to an inlet of the second cooling channel 213 and a second outlet pipe 243 connected to an outlet of the second cooling channel 213 may be attached to one side of the bottom plate 210. The second cooling device 320 may be connected to the second inlet pipe 241 via a supply pipe and to the second outlet pipe 243 via a return pipe. The second cooling device 320 may supply a second cooling fluid F2 having a predetermined temperature to the second cooling channel 213. The second cooling fluid F2 provided from the second cooling device 320 is supplied to the inlet of the second cooling channel 213 through the second inlet pipe 241. While the second cooling fluid F2 flows from the inlet to the outlet of the second cooling channel 213, the cell block 110 is cooled by heat exchange between the second cooling fluid F2 and the cell block 110, and the second cooling fluid F2 discharged from the outlet of the second cooling channel 213 can be recovered in the second cooling device 320 through the second outflow pipe 243 and the recovery piping.

[0047] 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 cooling water 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 for operating a refrigeration cycle with a refrigerant configured to undergo a phase change.

[0048] 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 a cooling system using the second cooling fluid F2 having a relatively low temperature may be greater than the cooling capacity of a cooling system using the first cooling fluid F1 having a relatively high temperature.

[0049] According to an exemplary embodiment of the present invention, the cooling plate includes a first cooling channel 211 and a second cooling channel 213 separated in a vertical direction (e.g., Z direction), and the cell block 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, heat generation in the battery pack 10 can be effectively controlled, ultimately improving the safety of the battery pack 10 and the electrical equipment including the battery pack 10.

[0050] In the battery pack 10 according to the comparative example, the cooling plate includes only cooling channels through which the refrigerant flows. In this case, if cooling is performed using only the refrigerant, the cell block 110 may be cooled to an excessively low temperature, or defrosting may be required to remove dew that has formed around the cooling plate due to the low temperature of the refrigerant.

[0051] According to an exemplary embodiment of the present invention, a first cooling channel 211 through which coolant flows may be provided between the cell block 110 and the second cooling channel 213 through which the refrigerant flows. In this case, the coolant can prevent dew from forming, and the battery pack 10 can be cooled without a separate defrosting operation.

[0052] (Second embodiment) Figures 4 and 5 are cross-sectional views showing a battery pack according to an exemplary embodiment of the present invention, with Figure 4 being a cross-sectional view of the battery pack taken along a line corresponding to line AA-AA' in Figure 1, and Figure 5 being a cross-sectional view of the battery pack taken along a line corresponding to line BB-BB' in Figure 1. The battery pack shown in Figures 4 and 5 will be described below, focusing on differences from battery pack 10 described with reference to Figures 1 to 3.

[0053] 4 and 5 , the bottom plate 210A of the pack housing 200 may include a first cooling channel 211, a second cooling channel 213, and a third cooling channel 215, which are separated in a vertical direction (e.g., the Z direction). The third cooling channel 215 may overlap the first cooling channel 211 and the second cooling channel 213 in a vertical direction (e.g., the Z direction). The third cooling channel 215 may be disposed below the second cooling channel 213. The second cooling channel 213 may be at a second distance from the cell block 110, and the third cooling channel 215 may be at a third distance from the cell block 110 that is 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 bottom plate 210A can be formed by an extrusion process, and the portion of the bottom plate 210A having the vertically stacked first cooling channel 211, second cooling channel 213, and third cooling channel 215 can be a single piece.

[0054] The third cooling device 330 may supply a third cooling fluid to the third cooling channel 215. The third cooling device 330 may be provided in an electric device (e.g., an electric vehicle) outside the battery pack. Alternatively, the third cooling device 330 may be included in the battery pack. A third inlet pipe connected to an inlet of the third cooling channel 215 and a third outlet pipe connected to an outlet of the third cooling channel 215 may be attached to one side of the bottom plate 210A. The third cooling device 330 may be connected to the third inlet pipe through a supply pipe and to the third outlet pipe through a return pipe. The third cooling device 330 may supply a third cooling fluid having a predetermined temperature to the third cooling channel 215. The third cooling fluid provided from the third cooling device 330 is supplied to the inlet of the third cooling channel 215 through the third inlet pipe. While the third cooling fluid flows from the inlet to the outlet of the third cooling channel 215, the cell block 110 is cooled by heat exchange between the third cooling fluid and the cell block 110, and the third cooling fluid discharged from the outlet of the third cooling channel 215 can be collected in the third cooling device 330 through a third outlet pipe and a collection pipe. The third cooling fluid can be cooling water or a refrigerant. When the third cooling fluid is a refrigerant, the third cooling device 330 that provides the third cooling fluid can include an element for operating a refrigeration cycle using a refrigerant configured to undergo a phase change.

[0055] In an exemplary embodiment, the first and third cooling fluids may be cooling water, and the second cooling fluid may be a refrigerant.

[0056] In an exemplary embodiment, the first cooling fluid may be cooling water, and the second and third cooling fluids may be refrigerants.

[0057] In an exemplary embodiment, the first and second cooling fluids may be cooling water, and the third cooling fluid may be a refrigerant.

[0058] 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.

[0059] 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 each be lower than the supply temperature of the first cooling fluid supplied to the inlet of the first cooling channel 211.

[0060] 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.

[0061] According to an exemplary embodiment of the present invention, the cooling plate includes first to third cooling channels 211, 213, 215 separated in a vertical direction (e.g., the Z direction), and the cell block 110 of the battery assembly 100 can be cooled using first to third cooling fluids flowing along the first to third cooling channels 211, 213, 215, thereby improving the cooling capacity.

[0062] According to an exemplary embodiment of the present invention, a first cooling channel 211 through which cooling water flows is provided between the cell block 110 and the second cooling channel 213 through which the refrigerant flows, so that the cooling water can prevent dew from forming and the battery pack can be cooled without performing a separate defrosting operation.

[0063] (Third embodiment) FIG. 6 is a schematic diagram illustrating an electric vehicle 1000 equipped with a battery pack 1100 according to an exemplary embodiment of the present invention.

[0064] For simplicity, FIG. 6 omits the illustration of some components of the electric vehicle 1000 and instead shows a portion of a body frame 1200 that forms the lower framework of the vehicle, a battery pack 1100 attached to the body frame 1200, tires, and a cooling device 1300. The battery pack 1100 may be located below a cabin room where passengers board. For example, the battery pack 1100 may include the battery pack 10 described with reference to FIGS. 1 to 3 or the battery pack described with reference to FIGS. 4 and 5. The cooling device 1300 may provide a cooling fluid for cooling the battery pack 1100 to a cooling plate of a pack housing. The cooling device 1300 may include multiple devices that provide different cooling fluids. In an exemplary embodiment, the cooling device 1300 may include the first cooling device 310 and the second cooling device 320 described with reference to FIGS. 1 to 3. In the exemplary embodiment, the cooling device 1300 may include the first cooling device 310, the second cooling device 320, and the third cooling device 330 described with reference to FIGS.

[0065] According to the exemplary embodiment of the present invention, it is possible to effectively control heat generation in battery pack 1100 by improving the cooling capacity of the cooling system for battery pack 1100. Therefore, it is possible to improve the safety and durability of battery pack 1100 and electric vehicle 1000 equipped with the same.

[0066] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations shown in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, and therefore, there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0067] 10 Battery pack 100 Battery assembly 110 Cell Block 111 Battery Cell 120 Thermally conductive adhesive layer 200 pack housing 210 Bottom Plate 210A Bottom Plate 211 First cooling channel 213 Second Cooling Channel 215 3rd Cooling Channel 221 Side wall 223 Top Plate 231 First inlet pipe 233 First Outlet Pipe 241 Second inlet pipe 243 Second Outlet Pipe 310 1st cooling device 320 2nd cooling device 330 Third cooling device 1000 electric cars 1100 Battery Pack 1200 body frame 1300 Cooling device F1 1st cooling fluid F2 2nd cooling fluid

Claims

1. a cell block including a plurality of battery cells; a pack housing that houses the cell block and includes a cooling plate connected to the cell block; A battery pack including: The cooling plate is a first cooling channel at a first distance from the cell block and through which a first cooling fluid flows; a second cooling channel at a second distance from the cell block, the second distance being greater than the first distance, through which a second cooling fluid flows; Including, The first cooling fluid and the second cooling fluid are different from each other.

2. the first cooling fluid is cooling water; The battery pack of claim 1 , wherein the second cooling fluid is a refrigerant.

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

4. The cooling plate is a third cooling channel, the third cooling channel being at a third distance from the cell block greater than the second distance and through which a third cooling fluid flows; The battery pack of claim 1 or 2, further comprising:

5. the first cooling fluid and the third cooling fluid are cooling water; The battery pack of claim 4 , wherein the second cooling fluid is a refrigerant.

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

7. the first cooling fluid is cooling water; The battery pack of claim 4 , wherein the second cooling fluid and the third cooling fluid are refrigerants.

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

9. 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; 5. The battery pack of claim 4, wherein a 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 or 2, further comprising a thermally conductive adhesive layer interposed between the cooling plate and the cell block.

11. the cooling plate supports the cell block; The pack housing includes: a sidewall on the cooling plate; a top plate coupled onto the sidewall so as to cover the cell block; The battery pack of claim 1 or 2, further comprising:

12. The body frame and a battery pack attached to the vehicle body frame; a first cooling device that supplies a first cooling fluid to the battery pack; a second cooling device that supplies a second cooling fluid to the battery pack; Including, The battery pack a cell block including a plurality of battery cells; a pack housing including a cooling plate that houses and supports the cell block; Including, The cooling plate is a first cooling channel through which the first cooling fluid supplied from the first cooling device flows; a second cooling channel located below the first cooling channel and through which the second cooling fluid supplied from the second cooling device flows; Including, The electric vehicle, wherein the first cooling fluid is a coolant and the second cooling fluid is a refrigerant.

13. a third cooling device that supplies a third cooling fluid to the battery pack; The electric vehicle of claim 12 , wherein the cooling plate further includes a third cooling channel located below the second cooling channel and through which the third cooling fluid supplied from the third cooling device flows.

14. 14. The electric vehicle of claim 13, wherein the third cooling fluid is cooling water.

15. 14. The electric vehicle of claim 13, wherein the third cooling fluid is a refrigerant.

Images