Battery pack

Abstract

According to an exemplary embodiment of the present invention, a battery pack is provided, the battery pack includes a housing including a plate portion, a first side wall and a second side wall connected to the plate portion, a plurality of battery assemblies disposed on the housing, and a lower supply piping assembly disposed on a first side of the housing, the plate portion includes a plurality of lower cooling channels extending in a first direction, the first side wall includes a first lower return channel, the second side wall includes a second lower return channel, and the lower supply piping assembly is connected to the plurality of lower cooling channels.

Description

[Technical Field]

[0001] The present invention relates to a battery pack. This application claims the benefit of Korean Application No. 10-2022-0179155, filed December 20, 2022, and Korean Application No. 10-2023-0029147, filed March 6, 2023, which are incorporated herein by reference in their entireties. [Background technology]

[0002] 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.

[0003] As secondary batteries are increasingly used in mobility, there are growing demands for the safety of these batteries. Since a fire or other accident involving a secondary battery used in mobility puts the driver's life at risk, research into technologies to improve secondary battery safety is essential. In particular, cooling technology to maintain the temperature of a secondary battery during operation is directly linked not only to the stability of the battery, but also to its lifespan and performance, and therefore much research is being conducted into cooling technology for secondary batteries. Summary of the Invention [Problem to be solved by the invention]

[0004] The problem to be solved by the technical idea of ​​the present invention is to provide a battery pack with improved reliability and safety. [Means for solving the problem]

[0005] According to an exemplary embodiment of the present invention to solve the above-mentioned problems, there is provided a battery pack including: a housing including a plate portion and first and second side walls connected to the plate portion; a plurality of battery assemblies disposed on the housing; and a lower supply piping assembly disposed on a first side of the housing, the plate portion including a plurality of lower cooling channels extending in a first direction, the first side wall including a first lower return channel, the second side wall including a second lower return channel, and the lower supply piping assembly being connected to the plurality of lower cooling channels.

[0006] The battery pack further includes a lower supply port disposed on the first side and connected to the lower supply piping assembly.

[0007] The battery pack further includes a lower discharge port disposed on the first side and connected to the first lower collecting channel and the second lower collecting channel.

[0008] Each of the first and second side walls further includes an exhaust passage configured to exhaust gas discharged from the battery assembly.

[0009] The battery pack further includes a lower return piping assembly disposed on a second side of the housing opposite the first side and connecting the plurality of lower cooling channels to the first lower return channel and the second lower return channel.

[0010] The lower supply piping assembly and the lower return piping assembly connect the plurality of lower cooling channels in parallel.

[0011] The first sidewall further includes a first upper collection channel disposed above the first lower collection channel.

[0012] The second sidewall further includes a second upper collection channel disposed above the second lower collection channel.

[0013] The battery pack further includes an upper cooling device disposed on the battery assembly and including a plurality of upper cooling channels.

[0014] The battery pack further includes an upper supply piping assembly disposed on the first side of the housing and connected to the plurality of upper cooling channels.

[0015] The upper supply piping assembly connects the upper cooling channels in parallel.

[0016] The battery pack further includes an upper supply port disposed on the first side and connected to the upper supply piping assembly.

[0017] The battery pack further includes an upper discharge port disposed on the first side and connected to the first upper collection channel and the second upper collection channel.

[0018] The battery pack further includes an upper return piping assembly connecting the plurality of upper cooling channels to the first and second upper return channels.

[0019] The upper return piping assembly is disposed on the second side of the housing. [Effects of the Invention]

[0020] The battery pack according to the exemplary embodiment of the present invention includes a cooling fluid recovery channel embedded in the side wall of the battery pack, which allows the side surface of the battery pack to be cooled during the cooling fluid recovery process, and the cooling system can be implemented in a relatively narrow space. Furthermore, since the input and output ports of the cooling port are each located on one side of the battery pack, the flow path design of the cooling system can be simplified.

[0021] 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]

[0022] [Figure 1] FIG. 2 is a plan view illustrating a battery pack according to an exemplary embodiment. [Figure 2] FIG. 2 is a plan view illustrating a battery pack according to an exemplary embodiment. [Figure 3] FIG. 1A is a cross-sectional view taken along the cutting line 1A-1A'. [Figure 4] FIG. 1B is a perspective view including a cross section along the cutting line 1B-1B'. [Figure 5] FIG. 1C is a perspective view including a cross section along the cutting line 1C-1C'. [Figure 6] FIG. 2 is a plan view illustrating a battery pack according to an exemplary embodiment. [Figure 7] FIG. 6B is a perspective view including a cross section along the cutting line 6B-6B'. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before that, the terms and words used in the 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 concepts of the terms to best describe his own invention.

[0024] 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.

[0025] Furthermore, in the description of the present invention, if it is determined that a detailed description of related publicly known structures or functions may obscure the gist of the present invention, the detailed description will be omitted.

[0026] 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 illustrated schematically for clearer explanation. Therefore, the sizes and proportions of each component do not completely reflect the actual sizes and proportions.

[0027] (First embodiment) FIG. 1 is a plan view illustrating a battery pack according to an exemplary embodiment.

[0028] 2 is a plan view illustrating a battery pack according to an exemplary embodiment, in which a cooling channel 111CH, a first recovery channel 112CH, and a second recovery channel 113CH embedded in a housing 110 are indicated by dashed lines.

[0029] FIG. 3 is a cross-sectional view taken along section line 1A-1A'.

[0030] FIG. 4 is a perspective view including a cross section along the cutting line 1B-1B'.

[0031] FIG. 5 is a perspective view including a cross section along section line 1C-1C'.

[0032] 1 to 5, the battery pack 100 may include a housing 110, a plurality of battery assemblies 120, a center beam 131, a plurality of cross beams 133, an injection port 210, a supply piping assembly 220, a recovery piping assembly 230, a recovery port 240, and a discharge port 250. The battery pack 100 is the final form of a battery system to be installed in a mobility device or the like.

[0033] The housing 110 may include a plate portion 111, a first side wall 112, a second side wall 113, a third side wall 114, and a fourth side wall 115. Two directions substantially parallel to the plate portion 111 are defined as the X direction and the Y direction, and a direction substantially perpendicular to the plate portion 111 is defined as the Z direction. The X direction, the Y direction, and the Z direction may be substantially perpendicular to each other. Unless otherwise specified, the definitions of directions are the same for the following drawings.

[0034] A battery area BR and an electrical component area ER may be defined on the plate portion 111. A plurality of battery assemblies 120 may be arranged on the battery area BR. Electrical components may be arranged on the electrical component area ER.

[0035] According to an exemplary embodiment, the plate portion 111 may include a plurality of cooling channels 111CH and a plurality of cavities 111C. By way of non-limiting example, the plate portion 111 may be provided by an extrusion process. According to an exemplary embodiment, the plate portion 111 may be provided by welding (e.g., friction stir welding) a plurality of plates together, whereby the plate portion 111 may include a joining surface JS therebetween.

[0036] According to an exemplary embodiment, the cooling channels 111CH may be configured to provide a path for a cooling fluid to flow. The cooling fluid may be a fluid for cooling the battery assemblies 120, such as water, air, or a coolant. The cooling channels 111CH may be spaced apart in the Y direction. The cooling channels 111CH may be arranged along the Y direction. The cooling channels 111CH may be interposed between the cavities 111C. Each of the cooling channels 111CH may also be referred to as a lower cooling channel.

[0037] The multiple cavities 111C are empty spaces formed inside the plate portion 111. The formation of the multiple cavities 111C may reduce the mass of the plate portion 111, thereby improving the energy density of the battery pack 100. The multiple cavities 111C may be spaced apart in the Y direction.

[0038] A plurality of battery assemblies 120 may be disposed on the plate portion 111 of the housing 110. The plate portion 111 may support the plurality of battery assemblies 120. The plate portion 111 may include substantially parallel upper and lower surfaces. The upper surface of the plate portion 111 may face the plurality of battery assemblies 120. The lower surface of the plate portion 111 is opposite the upper surface of the plate portion 111.

[0039] The first to fourth side walls 112, 113, 114, and 115 may horizontally surround the plurality of battery assemblies 120. The first to fourth side walls 112, 113, 114, and 115 may protect the plurality of battery assemblies 120. The first to fourth side walls 112, 113, 114, and 115 may be fixed to each other by a method such as friction stir welding or spot welding.

[0040] Each of the first side wall 112 and the second side wall 113 may be substantially perpendicular to the Y direction. The third side wall 114 may be substantially perpendicular to the X direction. The fourth side wall 115 may include a portion that is substantially perpendicular to the X direction and a portion that is substantially perpendicular to the Y direction. The first side wall 112 and the second side wall 113 may cover side surfaces of the plate portion 111. The third side wall 114 and the fourth side wall 115 may be disposed on the plate portion 111.

[0041] According to an exemplary embodiment, the first to fourth side walls 112, 113, 114, and 115 may be provided by an extrusion process. According to an exemplary embodiment, the first to fourth side walls 112, 113, 114, and 115 may include an internal empty space, like the second side wall 113 in FIG. 5 . This may reduce the weight of the first to fourth side walls 112, 113, 114, and 115, and improve the energy density of the battery pack 100.

[0042] According to an exemplary embodiment, some of the empty spaces of the first to fourth side walls 112, 113, 114, and 115 may be gas venting paths 113VP. The first side wall 112 and the second side wall 113 may be formed by an extrusion process. The empty spaces of the first side wall 112 and the second side wall 113 may extend in the X direction.

[0043] According to an exemplary embodiment, the first side wall 112 may include a first collection channel 112CH disposed in a portion of the open space of the first side wall 112. The first collection channel 112CH may be recessed in the first side wall 112. According to an exemplary embodiment, the second side wall 113 may include a second collection channel 113CH disposed in a portion of the open space of the second side wall 113. The second collection channel 113CH may be recessed in the second side wall 113. The first collection channel 112CH is referred to as a first lower collection channel, and the second collection channel 113CH is referred to as a second lower collection channel.

[0044] The battery assembly 120 may include a plurality of battery cells. In some embodiments, the battery assembly 120 may include a module frame that surrounds the plurality of battery cells. In some embodiments, the battery assembly 120 may not include a module frame.

[0045] A battery cell is the basic unit of a lithium-ion battery, i.e., a secondary battery. A battery cell includes an electrode assembly, an electrolyte, and a case. Battery cells are classified into lithium-ion batteries, lithium-ion polymer batteries, and lithium polymer batteries depending on the configuration of the electrode assembly and electrolyte. Lithium-ion polymer batteries are easy to manufacture, have a low risk of electrolyte leakage, and occupy a larger proportion of secondary batteries.

[0046] Depending on the shape of the battery case, battery cells are classified into cylindrical batteries, in which the electrode assembly is housed in a cylindrical metal can, prismatic batteries, in which the electrode assembly is housed in a prismatic metal can, and pouch batteries, in which the electrode assembly is housed in an aluminum laminate sheet pouch case.

[0047] The electrode assembly housed in the battery case includes a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes. Electrode assemblies are classified into jelly roll and stack types depending on the assembly configuration. The jelly roll type is formed by winding up a positive electrode, a negative electrode, and a separator interposed between them. The stack type includes multiple positive electrodes, multiple negative electrodes, and multiple separators interposed between them, stacked in sequence.

[0048] The center beam 131 can separate elements disposed on the housing 110 from one another, thereby protecting the multiple battery assemblies 120 and preventing unwanted short circuits between them.

[0049] The center beam 131 may extend between the third side wall 114 and any one of the multiple cross beams 133 (e.g., the cross beam 133 located farthest from the third side wall 114). The center beam 131 may extend in the X direction. The center beam 131 may contact the third side wall 114 and each of the multiple cross beams 133. The center beam 131 may separate the multiple battery assemblies 120 from each other. The center beam 131 may be interposed between the multiple battery assemblies 120.

[0050] Each of the multiple cross beams 133 may extend between the first side wall 112 and the center beam 131, or each of the multiple cross beams 133 may extend between the second side wall 113 and the center beam 131. Each of the multiple cross beams 133 may contact either the first side wall 112 or the second side wall 113. Each of the multiple cross beams 133 may extend in the Y direction. Each of the multiple cross beams 133 may separate the multiple battery assemblies 120 from each other. Each of the multiple cross beams 133 may be interposed between the multiple battery assemblies 120.

[0051] 1 is a non-limiting example and does not limit the technical concept of the present invention in any way. Based on what is described herein, a person skilled in the art can easily arrive at a battery pack including a center beam 131, multiple cross beams 133, and multiple battery assemblies in various arrangements and numbers.

[0052] The cooling fluid may be supplied to the supply piping assembly 220 through the injection ports 210. Each of the injection ports 210 may also be referred to as a lower injection port. The injection ports 210 may be connected to a cooling fluid source (e.g., a cooling system for the mobility). The injection ports 210 may provide a flow path for the cooling fluid.

[0053] The cooling fluid may be supplied to the plurality of cooling channels 111CH via a supply pipe assembly 220. The supply pipe assembly 220 may also be referred to as a lower supply pipe assembly. The supply pipe assembly 220 may include a plurality of supply pipes 221, a plurality of connectors 223, and a plurality of connecting pipes 225.

[0054] The plurality of supply pipes 221 may be connected to the injection port 210. The plurality of supply pipes 221 may be connected in parallel to one another. The plurality of connectors 223 may be connected to the plurality of supply pipes 221 or to the plurality of connecting pipes 225. The plurality of connecting pipes 225 may connect the plurality of connectors 223 to one another. Each of the plurality of connectors 223 may be connected to a corresponding one of the plurality of cooling channels 111CH. This allows each of the plurality of cooling channels 111CH to be connected in parallel based on the flow of the cooling fluid, and pressure drop along the cooling fluid path may be reduced. Additional pipes may be further provided between the plurality of connectors 223 and the plurality of cooling channels 111CH to connect the plurality of connectors 223 and the plurality of cooling channels 111CH.

[0055] The cooling fluid may cool the plurality of battery assemblies 120 by flowing along the plurality of cooling channels 111CH. The cooling fluid that has flowed along the plurality of cooling channels 111CH may be collected via the return piping assembly 230. The return piping assembly 230 is also referred to as a lower return piping assembly. The cooling fluid collected by the return piping assembly 230 may flow to the return ports 240. Each of the return ports 240 is also referred to as a lower return port. The return piping assembly 230 may include a plurality of return piping 231, a plurality of connectors 233, and a plurality of connecting piping 235.

[0056] The plurality of recovery pipes 231 may be connected to the recovery port 240. The plurality of recovery pipes 231 may be connected in parallel to one another. The plurality of connectors 233 may be connected to the plurality of recovery pipes 231 or to the plurality of connecting pipes 235. The plurality of connecting pipes 235 may connect the plurality of connectors 233 to one another. Each of the plurality of connectors 233 may be connected to a corresponding one of the plurality of cooling channels 111CH. Additional pipes may further be provided between the plurality of connectors 233 and the plurality of cooling channels 111CH to connect the plurality of connectors 233 and the plurality of cooling channels 111CH.

[0057] The cooling fluid can be discharged to a cooling fluid sink (e.g., a cooling system for a mobility vehicle) via the collection port 240, the first collection channel 112CH and the second collection channel 113CH, and the discharge port 250. Each of the discharge ports 250 is also referred to as a lower discharge port. The cooling fluid can cool the multiple battery assemblies 120 while flowing along the first collection channel 112CH and the second collection channel 113CH. This increases the number of surfaces that cool the multiple battery assemblies 120, thereby improving the cooling performance of the battery pack 100.

[0058] According to an exemplary embodiment, the inlet port 210 and the outlet port 250 may be disposed on the same side of the housing 110. More specifically, the inlet port 210 and the outlet port 250 may be disposed on the side of the housing 110 where the third side wall 114 is disposed. Because the inlet port 210 and the outlet port 250 are disposed on the same side of the housing 110, the flow path design of the cooling system for supplying cooling fluid to the battery pack 100 may be simplified. The side of the housing 110 adjacent to the third side wall 114 is defined as a first side, and the side of the housing 110 adjacent to the fourth side wall is defined as a second side. The first side and the second side may be spaced apart in the X direction and may be opposite each other.

[0059] The battery pack 100 may further include a plurality of exhaust devices. The plurality of exhaust devices may be connected to the venting path 113VP. The venting path 113VP may be a path for discharging gas and heat inside the battery pack 100.

[0060] The exhaust devices may be configured to slow thermal propagation by releasing high-temperature gases inside the battery pack 100 to the outside when at least one of the battery assemblies 120 is in a thermal runway state.

[0061] Here, thermal runaway of the battery assemblies 120 is a state in which the temperature change of the battery assemblies 120 accelerates the temperature change, resulting in an uncontrollable positive feedback loop. The battery assemblies 120 in a thermal runaway state exhibit a rapid temperature rise and emit a large amount of high-pressure gas and combustion debris.

[0062] The battery pack 100 may further include electrical components. The electrical components may be arranged on an electrical component area ER. The electrical components may include any electronic elements necessary to operate the battery pack.

[0063] The electrical components may include, for example, a BMS (Battery Management System). The BMS may be configured to monitor, balance, and control the battery pack. Monitoring the battery pack 100 may include measuring the voltage and current of specific nodes within the multiple battery assemblies 120 and measuring the temperature at a set location within the battery pack 100. The battery pack 100 may include measuring instruments for measuring the voltage, current, and temperature described above.

[0064] Balancing the battery pack 100 is an operation to reduce the deviation between the multiple battery 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 of each of the multiple battery assemblies 120.

[0065] The electrical components may further include a cooling device, a power relay assembly (PRA), a safety plug, etc. The cooling device may include a cooling fan. The cooling fan may prevent overheating of each of the multiple battery assemblies 120 by circulating air inside the battery pack 100. The PRA may be configured to supply or cut off power from the high-voltage battery to an external load (e.g., a vehicle motor). The PRA may protect the multiple battery assemblies 120 and the external load (e.g., a vehicle motor) by cutting off the power supply to the external load (e.g., a vehicle motor) in the event of an abnormal voltage such as a voltage surge.

[0066] The battery pack 100 may further include a plurality of bus bars configured to electrically connect the plurality of battery assemblies 120. The plurality of battery assemblies 120 may be connected in series by the plurality of bus bars. This allows the battery pack 100 to be configured to output a high voltage to an external load (e.g., a vehicle motor).

[0067] The battery pack 100 may further include a lead plate coupled to the housing 110. The lead plate may cover the electrical components and the battery assembly.

[0068] (Second embodiment) FIG. 6 is a plan view illustrating a battery pack 100' according to an exemplary embodiment.

[0069] FIG. 7 is a perspective view including a cross section along section line 6A-6A'.

[0070] 1, 6, and 7, the battery pack 100′ is substantially the same as the battery pack 100, except that the housing 110 is replaced with a housing 110′ and the battery pack 100′ further includes a cooling device 140, an inlet port 310, a supply piping assembly 320, a recovery piping assembly 330, a recovery port 340, and a discharge port 350. Thus, the battery pack 100′ may include a plurality of battery assemblies 120, a center beam 131, a plurality of cross beams 133, an inlet port 210, a supply piping assembly 220, a recovery piping assembly 230, a recovery port 240, and a discharge port 250, and redundant descriptions thereof will be omitted.

[0071] The housing 110' may include a plate portion 111, a first side wall 112', a second side wall 113', a third side wall 114, and a fourth side wall 115. The plate portion 111, the third side wall 114, and the fourth side wall 115 are substantially the same as those described with reference to Figures 1 to 5.

[0072] The first sidewall 112' is the same as the first sidewall 112 (see FIG. 1) except that it includes an additional first collection channel 112CH'. The second sidewall 113' is the same as the second sidewall 113 (see FIG. 1) except that it includes an additional second collection channel 113CH'. The first collection channel 112CH' and the second collection channel 113CH' may be disposed in the empty space inside the first sidewall 112' and the second sidewall 113'. The first collection channel 112CH' is referred to as the first upper collection channel, and the second collection channel 113CH' is referred to as the second upper collection channel.

[0073] The cooling device 140 may cover the plurality of battery assemblies 120 (see FIG. 1). The cooling device 140 may cool the upper portions of the plurality of battery assemblies 120 (see FIG. 1), thereby improving the cooling performance of the battery pack 100′. The cooling device 140 may be provided, for example, by an extrusion process. The cooling device 140 may include a plurality of cooling channels 140CH extending along the X direction. The plurality of cooling channels 140CH are also referred to as upper cooling channels.

[0074] The cooling fluid may be supplied to the supply piping assembly 320 through the injection ports 310. Each of the injection ports 310 may also be referred to as an upper injection port. The injection ports 310 may be connected to a cooling fluid source (e.g., a cooling system for the mobility). The injection ports 310 may provide a flow path for the cooling fluid.

[0075] The cooling fluid may be supplied to the plurality of cooling channels 140CH via a supply piping assembly 320. The supply piping assembly 320 may also be referred to as an upper supply piping assembly. The supply piping assembly 320 may include a plurality of supply piping 321, a plurality of connectors 323, and a plurality of connecting piping 325.

[0076] The plurality of supply pipes 321 may be connected to the injection port 310. The plurality of supply pipes 321 may be connected in parallel to one another. The plurality of connectors 323 may be connected to the plurality of supply pipes 321 or to the plurality of connecting pipes 325. The plurality of connecting pipes 325 may connect the plurality of connectors 323 to one another. Each of the plurality of connectors 323 may be connected to a corresponding one of the plurality of cooling channels 140CH. This allows each of the plurality of cooling channels 140CH to be connected in parallel based on the flow of the cooling fluid, and pressure drops along the path of the cooling fluid may be reduced. Additional pipes may be further provided between the plurality of connectors 323 and the plurality of cooling channels 140CH to connect the plurality of connectors 323 and the plurality of cooling channels 140CH.

[0077] The cooling fluid may cool the plurality of battery assemblies by flowing along the plurality of cooling channels 140CH. The cooling fluid that has flowed along the plurality of cooling channels 140CH may be collected via a return piping assembly 330. The return piping assembly 330 is also referred to as an upper return piping assembly. The cooling fluid collected by the return piping assembly 330 may flow to a return port 340. Each of the return ports 340 is also referred to as an upper return port. The return piping assembly 330 may include a plurality of return pipes 331, a plurality of connectors 333, and a plurality of connecting pipes 335.

[0078] The plurality of recovery pipes 331 may be connected to the recovery ports 340. The plurality of recovery pipes 331 may be connected in parallel to one another. The plurality of connectors 333 may be connected to the plurality of recovery pipes 331 or to the plurality of connecting pipes 335. The plurality of connecting pipes 335 may connect the plurality of connectors 333 to one another. Each of the plurality of connectors 333 may be connected to a corresponding one of the plurality of cooling channels 140CH. Additional pipes may further be provided between the plurality of connectors 333 and the plurality of cooling channels 140CH to connect the plurality of connectors 333 and the plurality of cooling channels 140CH.

[0079] The cooling fluid can be discharged to the outside (e.g., a cooling system of the mobility vehicle) through the collection port 340, the first collection channel 112CH and the second collection channel 113CH, and the discharge port 350. Each of the discharge ports 350 is also referred to as an upper discharge port. The cooling fluid can cool the plurality of battery assemblies 120 while flowing along the first collection channel 112CH and the second collection channel 113CH. This increases the number of cooled surfaces of each of the plurality of battery assemblies 120, thereby improving the cooling performance of the battery pack 100.

[0080] According to an exemplary embodiment, the inlet port 310 and the outlet port 350 may be disposed on the same side of the housing 110′. More specifically, the inlet port 310 and the outlet port 350 may be disposed on the side of the housing 110′ on which the third side wall 114 is disposed. Because the inlet port 310 and the outlet port 350 are disposed on the same side (i.e., the first side) of the housing 110′, the flow path design of a cooling system for supplying cooling fluid to the battery pack 100′ may be simplified.

[0081] The present invention has been described in more detail above through the drawings and embodiments, etc. However, the configurations described 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]

[0082] 100 battery packs 110 Housing 111 Plate section 111C Cavity 111CH Cooling Channel 112 First side wall 112CH 1st recovery channel 113 Second side wall 113CH Second recovery channel 113VP Venting Route 114 Third Side Wall 115 4th side wall 120 Battery Assembly 131 Center beam 133 Cross Beam 140 Cooling device 140CH cooling channels 210 Injection port 220 Supply Piping Assembly 221 Supply piping 223 Connector 225 Connecting piping 230 Recovery piping assembly 231 Recovery piping 233 Connector 235 Connecting piping 240 Collection Port 250 exhaust port 310 Injection port 320 Supply Piping Assembly 321 Supply piping 323 Connector 325 Connecting piping 330 Recovery piping assembly 331 Recovery piping 333 Connector 335 Connecting piping 340 Collection Port 350 exhaust port

Claims

1. a housing including a plate portion and a first side wall and a second side wall connected to the plate portion; a plurality of battery assemblies disposed on the housing; a lower supply piping assembly disposed on a first side of the housing; A battery pack comprising: the plate portion includes a plurality of lower cooling channels extending in a first direction; the first sidewall includes a first lower collection channel; the second sidewall includes a second lower collection channel; The lower supply piping assembly is connected to a plurality of the lower cooling channels.

2. The battery pack according to claim 1 , further comprising a lower supply port disposed on the first side and connected to the lower supply piping assembly.

3. The battery pack of claim 1 , further comprising a lower exhaust port disposed on the first side and coupled to the first and second lower collecting channels.

4. The battery pack according to claim 1 , wherein each of the first side wall and the second side wall further includes an exhaust passage configured to exhaust gas discharged from the battery assembly.

5. 2. The battery pack of claim 1, further comprising a lower return piping assembly disposed on a second side of the housing opposite the first side, the lower return piping assembly connecting the plurality of lower cooling channels to the first lower return channel and the second lower return channel.

6. 6. The battery pack according to claim 5, wherein the lower supply piping assembly and the lower return piping assembly connect to a plurality of the lower cooling channels in parallel.

7. the first sidewall further includes a first upper collection channel disposed above the first lower collection channel; The battery pack of claim 1 , wherein the second side wall further includes a second upper collecting channel disposed above the second lower collecting channel.

8. The battery pack according to claim 7 , further comprising an upper cooling device disposed on the battery assembly and including a plurality of upper cooling channels.

9. The battery pack according to claim 8 , further comprising an upper supply piping assembly disposed on the first side of the housing and coupled to a plurality of the upper cooling channels.

10. 10. The battery pack according to claim 9, wherein the upper supply piping assembly connects to a plurality of the upper cooling channels in parallel.

11. The battery pack of claim 9 , further comprising an upper supply port disposed on the first side and coupled to the upper supply piping assembly.

12. The battery pack of claim 9 , further comprising an upper exhaust port disposed on the first side and coupled to the first and second upper collection channels.

13. 10. The battery pack of claim 8, further comprising an upper return piping assembly connecting a plurality of the upper cooling channels to the first and second upper return channels.

14. The battery pack of claim 13 , wherein the upper return piping assembly is disposed on a second side of the housing opposite the first side.

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