Battery pack and vehicle

Abstract

A battery pack and a vehicle, which solve the technical problem in the prior art of poor heat dissipation effect of batteries. The battery pack comprises: a case, comprising a bottom plate (200) and a frame (100) which are connected to each other, the bottom plate (200) being provided with cooling channels (210), and liquid inlets (211) and liquid outlets (212) in communication with the cooling channels (210), wherein two side longitudinal beams (110) of the frame (100) are each provided with cavities (114) and a main port communicated with the cavities (114), the cavities (114) of one of the side longitudinal beams (110) are communicated with the liquid inlets (211) of the cooling channels (210), and the cavities (114) of the other side longitudinal beam (110) are communicated with the liquid outlets (212) of the cooling channels (210); and modules (300) covering openings of the cooling channels (210), so as to be in contact with a coolant in the cooling channels (210) for heat exchange. The coolant in the battery pack directly flushes the modules (300) for heat exchange, improving the cooling effect, and achieving good temperature uniformity of battery cells in the modules (300).

Description

A battery pack and a vehicle Cross-references to related applications

[0001] This application claims priority to Chinese patent application No. 202410917470.8, filed on July 10, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of battery pack technology, specifically relating to a battery pack and a vehicle. Background Technology

[0003] The power battery is the core power supply component of an electric vehicle. The power battery generates heat during use, so a cooling system is needed to dissipate the heat.

[0004] In related technologies, liquid cooling plates and thermal pads are usually placed between battery modules. Coolant is circulated through the liquid cooling plate, and heat is transferred through the thermal pad to remove the heat from the battery module. However, assembling the liquid cooling plate and thermal pad adds many parts, thereby increasing weight and occupying limited space within the battery pack. Furthermore, the presence of the liquid cooling plate and thermal pad between the battery module and the coolant affects the heat conduction efficiency and reduces the heat dissipation effect. Summary of the Invention

[0005] To address the current technical problem of low heat dissipation efficiency, this application provides a battery pack and a vehicle.

[0006] In a first aspect of this application, a battery pack is provided, comprising:

[0007] The housing includes a connected base plate and a frame. The base plate is provided with a cooling tank and an inlet and an outlet connected to the cooling tank. The two side longitudinal beams of the frame are each provided with a cavity and a main opening connected to the cavity. The cavity of one side longitudinal beam is connected to the inlet of the cooling tank, and the cavity of the other side longitudinal beam is connected to the outlet of the cooling tank.

[0008] The module covers the opening of the cooling tank to exchange heat with the coolant in the cooling tank.

[0009] In some optimized technical solutions, the base plate is provided with multiple baffle columns, and the multiple baffle columns are located in the cooling tank.

[0010] In some optimized technical solutions, the turbulence column is spaced apart from the module.

[0011] Some optimized technical solutions also include a heating structure located within the cooling tank.

[0012] In some optimized technical solutions, the heating structure includes a heating wire and an insulating encapsulation film covering the heating wire, the insulating encapsulation film being adhered to the module or the base plate.

[0013] In some optimized technical solutions, the heating structure is strip-shaped, and the strip-shaped heating structure is curved.

[0014] In some optimized technical solutions, the number of cooling tanks is the same as the number of modules, and multiple cooling tanks are provided, with each module covering the corresponding cooling tank.

[0015] In some optimized technical solutions, multiple cooling tanks are arranged sequentially along the flow direction of the coolant, and the multiple cooling tanks are connected in series; and / or;

[0016] The multiple cooling tanks are arranged sequentially along the axial direction of the side longitudinal beam, and the multiple cooling tanks are connected in parallel.

[0017] In some optimized technical solutions, the main opening of the side longitudinal beam is located on one side of a plurality of modules arranged sequentially along the axial direction of the side longitudinal beam, and the liquid inlet size of the plurality of cooling tanks arranged sequentially along the axial direction of the side longitudinal beam increases sequentially in the direction away from the main opening.

[0018] In some optimized technical solutions, the side longitudinal beam includes a body and a protrusion connected to the body. The protrusion is provided with the cavity and the main opening, and the protrusion is fitted and connected to the bottom plate.

[0019] In some optimized technical solutions, the protrusion is provided with a fitting protrusion, the periphery of the base plate is provided with a fitting groove, and the fitting protrusion is located in the fitting groove.

[0020] In some optimized technical solutions, the module includes a bottom shell and two end plates connected to the bottom shell, the end plates being connected to the frame and / or the bottom plate.

[0021] In some optimized technical solutions, the middle part of the end plate protrudes away from the module to form a receiving cavity for accommodating module parts. The frame and / or the bottom plate are provided with a connecting platform extending toward the module. The protruding part of the end plate is located above or below the connecting platform, and the protruding part of the end plate is connected to the connecting platform.

[0022] In some optimized technical solutions, the base plate is provided with an annular groove surrounding the cooling tank, and the module is sealed and covered by a sealing element located in the annular groove.

[0023] In a second aspect of this application, a vehicle is provided, including the battery pack of the first aspect.

[0024] The battery pack provided according to the embodiments of this application includes a housing and a module. The housing includes a connected base plate and a frame. The base plate is provided with a cooling tank and an inlet and an outlet connected to the cooling tank to allow coolant to flow in the cooling tank. The two side longitudinal beams of the frame are each provided with a cavity and a common opening connected to the cavity. The cavity of one side longitudinal beam forms an inlet channel for coolant to flow and is connected to the inlet of the cooling tank to provide coolant to the cooling tank. The cavity of the other side longitudinal beam is connected to the outlet of the cooling tank to form an outlet channel for coolant to flow. The module covers the opening of the cooling tank to contact and exchange heat with the coolant in the cooling tank to improve the heat exchange effect of the module.

[0025] Compared to existing technologies, the battery pack provided in this application uses the cavities of two side longitudinal beams as the main inlet and outlet channels for coolant flow. Simultaneously, cooling grooves are formed on the bottom plate of the housing, with the bottom plate and module assembly forming branch channels. This reduces the number of battery pack parts, simplifies the battery pack structure, and improves assembly efficiency. Furthermore, the coolant within the branch channels formed by the bottom plate and module assembly can directly contact and scour the modules, improving the cooling effect and ensuring temperature uniformity of the battery modules. This has a significant positive impact on improving battery cooling efficiency, reducing temperature differences between cells, and lowering energy consumption. Attached Figure Description

[0026] Figure 1 shows a schematic diagram of the structure of the battery pack in one or more embodiments of this application.

[0027] Figure 2 shows an exploded view of the frame, base plate, and seals of the battery pack in Figure 1.

[0028] Figure 3 shows a schematic diagram of the assembly of the base plate and frame in Figure 1.

[0029] Figure 4 shows a magnified view of one of the parts in Figure 3.

[0030] Figure 5 shows a magnified view of another part of Figure 3.

[0031] Figure 6 shows another enlarged view of a portion of Figure 3.

[0032] Figure 7 shows a partially enlarged view of section AA in Figure 1.

[0033] Figure 8 shows a partial cross-sectional view of BB in Figure 1.

[0034] Figure 9 shows an exploded view of the module and the frame.

[0035] Figure 10 shows a partial enlarged view of Figure 9.

[0036] Figure 11 shows a schematic diagram of the module in Figure 9.

[0037] Explanation of reference numerals in the attached figures:

[0038] 100-Frame, 110-Side longitudinal beam, 111-Body, 112-Protrusion, 1121-Matching protrusion, 113-Hanging part, 114-Cavity, 115-Chamber, 116-First reinforcing cavity, 117-Second reinforcing cavity, 118-Interface, 119-Main pipe, 120-Side crossbeam, 130-Crossbeam, 140-Longitudinal beam, 150-Connecting platform;

[0039] 200-Base plate, 210-Cooling tank, 211-Inlet, 212-Outlet, 220-Breakthrough column, 230-Heating structure, 231-Heating wire, 240-Matching groove, 250-Process hole, 260-Sealing element;

[0040] 300 - Module, 310 - Bottom shell, 320 - End plate. Detailed Implementation

[0041] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0042] According to a first aspect of this application, a battery pack is provided in which the coolant can directly contact the module for heat exchange, resulting in high heat exchange efficiency. Furthermore, the cooling channels are integrated within the frame, eliminating the need for cooling pipes, simplifying the structure, and improving space utilization.

[0043] Please refer to Figures 1, 2, and 3. The battery pack provided in this embodiment includes a housing and a module 300, wherein:

[0044] The housing includes a connected base plate 200 and a frame 100. The frame 100 and the base plate 200 can be combined to form a cavity for accommodating the module 300. The base plate 200 is provided with a cooling groove 210 and an inlet 211 and an outlet 212 connected to the cooling groove 210, so that the coolant can flow in the cooling groove 210. The cooling groove 210 forms a cooling channel for thermal management of the module 300 located on the base plate 200. Since the size of the cooling groove 210 along the longitudinal beam 110 is slightly smaller than that of the module 300 and very close to that of the module 300, the width of the cooling channel is very large, which can accommodate a large flow of coolant. The flow of coolant is smoother, the structure is simple, and the cooling effect is good. Both side longitudinal beams 110 of the frame 100 are provided with cavities 114 and a general opening connected to the cavities 114. The cavity 114 of one side longitudinal beam 110 serves as a coolant inlet channel and is connected to the coolant inlet 211 of the cooling tank 210 to supply coolant to the cooling tank 210. The cavity 114 of the other side longitudinal beam 110 serves as a coolant outlet channel and is connected to the coolant outlet 212 of the cooling tank 210 to discharge the coolant in the cooling tank 210. Therefore, the cavity 114 provides a coolant flow channel, eliminating the need for additional cooling pipes, simplifying the structure, improving space utilization, and enhancing the structural strength of the frame 100. The module 300 can be a module 300 composed of pouch cells, or a module 300 composed of prismatic cells or cylindrical cells. It covers the opening of the cooling tank 210, so the bottom of the module 300 can directly contact the coolant flowing in the cooling tank 210 for heat exchange without passing through the thermal pad and liquid cooling plate. Therefore, the heat transfer path is shortened and the cooling effect of the module 300 is improved.

[0045] The base plate 200 serves as both a cooling structure and a support structure for the module 300. In some embodiments, the shape of the cooling groove 210 on the base plate 200 can be consistent with the bottom shape of the module 300, increasing the contact heat exchange area between the coolant and the module 300. In other embodiments, the shape of the cooling groove 210 on the base plate 200 can also differ from the shape of the bottom of the module 300, while still achieving contact heat exchange between the coolant and the module 300. In some embodiments, the size of the cooling groove 210 can be slightly smaller than the bottom size of the module 300 to increase the contact heat exchange area between the coolant and the module 300, improving the heat dissipation effect of the module 300. In other embodiments, the module 300 is provided with a heat dissipation protrusion extending toward the cooling groove 210. The heat dissipation protrusion extends into the cooling groove 210 and is immersed in the coolant, forming semi-immersion cooling, further increasing the contact heat exchange area between the module 300 and the coolant, and improving the cooling effect of the module 300. Regarding the processing method of the base plate 200, the base plate 200 can be machined to form the cooling groove 210, or it can be obtained by integral stamping. When machining the base plate 200, it can be processed by double-sided milling. The cooling groove 210 is milled into the top surface of the base plate 200, and the process opening is first machined into the bottom surface of the base plate 200, followed by milling the liquid inlet 211 and liquid outlet 212. Finally, a patch is added at the process opening position for welding sealing. The base plate 200 and the frame 100 can be connected by friction stir welding.

[0046] In some embodiments, the heat dissipation protrusion may extend intermittently into the cooling tank 210, allowing the coolant to dissipate heat from both the top and sides of the protrusion, thus increasing the heat dissipation area and improving the cooling effect. In other embodiments, the size of the heat dissipation protrusion may also match the cooling tank 210, allowing the coolant to contact the top of the protrusion extending into the cooling tank 210 for heat dissipation, or enabling direct contact heat exchange between the coolant and the bottom of the module 300, resulting in good cooling performance.

[0047] In some embodiments, referring to Figures 3 and 5, the inlet 211 and outlet 212 are arranged opposite to each other along the coolant flow direction and are both connected to the wall of the cooling tank 210. The height of the inlet 211 and outlet 212 is smaller than the depth of the cooling tank 210, and the axial dimensions of the inlet 211 and outlet 212 along the side longitudinal beam 110 are smaller than the wall dimensions of the cooling tank 210. Because the cooling tank 210 is relatively large, the smaller dimensions of the inlet 211 and outlet 212 improve the strength of the floor while ensuring effective thermal management of the module 300. In other embodiments, the axial dimensions of the inlet 211 and outlet 212 along the side longitudinal beam 110 are the same as the dimensions of the cooling tank 210, increasing the cross-sectional area of ​​the coolant flow channel, allowing for smooth and unobstructed coolant flow and improving cooling performance.

[0048] In some embodiments, referring to Figure 7, the base plate 200 has an annular groove surrounding the cooling tank 210. The module 300 is sealed and covered by a seal 260 located within the annular groove to ensure a tight seal between the cooling tank 210 and the module 300, preventing coolant leakage. The seal 260 can be a sealing ring, such as an O-ring or an X-ring. In some embodiments, multiple annular grooves can be provided, all surrounding the cooling tank 210. The multiple annular grooves are arranged sequentially from the inside to the outside. The number of seals 260 is the same as the number of annular grooves, and the seals 260 are located within their respective annular grooves. The module 300 is sealed and covered by multiple seals 260 to improve the tight seal between the cooling tank 210 and the module 300. The shape of the annular groove can be the same as the shape of the cooling tank 210.

[0049] Please refer to Figures 3 to 6. The base plate 200 is provided with baffle columns 220, which are located inside the cooling tank 210. These baffle columns 220 can turbulently flow through the cooling tank 210, increasing the residence time of the coolant within the cooling tank 210 and thus improving the heat transfer effect between the coolant and the module 300. Multiple baffle columns 220 can be provided, such as three, five, eight, or fifteen. In one embodiment, multiple baffle columns 220 can be evenly distributed at intervals within the cooling tank 210 to enhance the baffle effect. In another embodiment, the multiple turbulence columns 220 may be non-uniformly distributed in the cooling tank 210. For example, the turbulence columns 220 near the liquid inlet 211 may be denser than those near the liquid outlet 212, or the turbulence columns 220 near the liquid outlet 212 may be denser than those near the liquid inlet 211, or the turbulence columns 220 may be denser, sparser, and then denser again along the flow direction of the coolant, or even sparser, denser, and then sparser again along the flow direction of the coolant, which can also achieve the effect of turbulence on the coolant.

[0050] In some embodiments, the baffle columns 220 can be arranged vertically or horizontally to turbulent the coolant flow. In other embodiments, some of the baffle columns 220 are arranged vertically, while the remaining baffle columns 220 are arranged horizontally, which also achieves the effect of turbulent coolant flow. In yet another embodiment, the baffle columns 220 can also be arranged at an angle, and the angles of the multiple baffle columns 220 can be the same or different, and the angles of the baffle columns 220 can be acute or obtuse, which also achieves the effect of turbulent coolant flow.

[0051] In some embodiments, the shape of the baffle column 220 can be cylindrical, prismatic, or conical. In other embodiments, the baffle column 220 includes a connected column section and a spherical section, with the column section connected to the bottom of the cooling tank 210 and the spherical section facing the module.

[0052] Referring to Figure 7, the baffle column 220 is spaced apart from the module 300, meaning the height of the baffle column 220 is less than the depth of the cooling tank 210. This arrangement ensures that the contact area between the coolant and the module 300 is not obstructed, improving heat dissipation, and also guarantees the uniformity of the coolant flow rate in contact with the module 300, thus improving the temperature uniformity of the module 300. Specifically, when the baffle column 220 is vertically positioned, its top is spaced apart from the module 300; when the baffle column 220 is horizontally positioned, its periphery is spaced apart from the module 300. When the module 300 has a heat dissipation protrusion, the baffle column 220 can be located in the space between the heat dissipation protrusion and the wall of the cooling tank 210, or it can be located below the heat dissipation protrusion. When the baffle column 220 is located below the heat dissipation protrusion, it is spaced apart from the protrusion, which also helps to turbulent the coolant flow. The spacing between the baffle column 220 and the module 300 can be determined according to the depth of the cooling tank 210 and the flow rate of the coolant. The spacing between the baffle column 220 and the module 300 can be 2mm to 5mm, such as 3mm or 4mm, which ensures that the coolant can directly contact the bottom of the module 300 for heat exchange, and also ensures the uniformity of the speed of the coolant in contact with the module 300, thereby ensuring the temperature uniformity of the module 300.

[0053] In other embodiments, the baffle column 220 is arranged in contact with the module 300. Although the baffle column 220 is in contact with the coolant, the thermal conductivity of the baffle column 220 and the coolant are different, and their temperatures may be different. This may result in different heat dissipation efficiencies in different parts of the module 300, but it can still turbulent the coolant, increase the residence time of the coolant, and improve the heat dissipation effect.

[0054] In some embodiments, the base plate 200 and the spoiler column 220 can be an integral structure obtained through machining. In other embodiments, the spoiler column 220 and the base plate 200 can also be separate structures obtained by welding the spoiler column 220 and the base plate 200 together.

[0055] In some embodiments, referring to Figure 7, the wall thickness of the base plate 200 above the liquid inlet 211 or liquid outlet 212 is greater than the wall thickness below the liquid inlet 211 or liquid outlet 212. It is understood that the design of the cooling tank 210 reduces the strength of the base plate 200 itself. Since the module 300 covers the cooling tank 210 and is sealed to the upper surface of the base plate 200, a larger distance between the upper edge of the liquid inlet 211 or liquid outlet 212 and the upper surface of the base plate 200 can improve the support stability of the module 300. In other embodiments, the wall thickness of the base plate 200 above the liquid inlet 211 or liquid outlet 212 is equal to or less than the wall thickness below the liquid inlet 211 or liquid outlet 212, yet still provides support for the module 300. It should be noted that the cooling tank 210, liquid inlet 211 and liquid outlet 212 of the base plate 200 can be obtained by machining. The process hole 250 can be opened on the side of the base plate 200 away from the module 300. After machining, the process hole 250 is sealed by a sealing structure.

[0056] In some embodiments, as shown in Figures 1 to 3, multiple cooling slots 210 and modules 300 are provided. The number of cooling slots 210 and modules 300 is the same and they correspond one-to-one. Each module 300 covers its corresponding cooling slot 210. The arrangement of multiple modules 300 can increase the number of modules 300 in the battery pack, increase the power of the battery pack, and improve the vehicle's driving range. Each module 300 covers its corresponding cooling slot 210, allowing the base plate 200 to perform thermal management on all modules 300.

[0057] In some embodiments, multiple cooling tanks 210, such as two or three cooling tanks 210, are arranged sequentially along the flow direction of the coolant. These multiple cooling tanks 210 are connected in series to form a series cooling channel through which the coolant flows from the inlet channel of one side longitudinal beam 110 to the outlet channel of another side longitudinal beam 110, thereby simultaneously providing thermal management for the module 300 covering the series cooling tanks 210. Because the cooling channel of the cooling tank type 210 has a very large width and a very large coolant flow rate, multiple cooling tanks 210 can be connected in series to form a long cooling channel that still has good heat dissipation performance. It should be noted that the number of series cooling tanks 210 is not limited and is designed according to factors such as battery pack size, heat exchange requirements, and flow rate.

[0058] In other embodiments, multiple cooling tanks 210 are arranged sequentially along the axial direction of the side longitudinal beams 110, and the multiple cooling tanks 210 are connected in parallel. In this way, the cavity 114 of one side longitudinal beam 110 forms a liquid inlet main flow channel, and the cavity 114 of the other side longitudinal beam 110 forms a liquid outlet main flow channel, thereby forming multiple branch flow channels arranged in parallel between the liquid inlet main flow channel and the liquid outlet main flow channel. This allows for simultaneous thermal management of the module 300 covering the parallel cooling tanks 210. This arrangement can shorten the total length of the flow path in each branch flow channel, thereby reducing the accumulation of heat in the coolant in the branch flow channels and improving the overall heat exchange effect. It should be noted that the number of branch flow channels is not limited and is designed according to factors such as battery pack size, heat exchange requirements, and flow rate. The side longitudinal beams 110 serve as a box structure, and the cavity 114 within them forms the liquid inlet main flow channel and the liquid outlet main flow channel, simplifying the piping, making the structure simpler, and increasing the integration.

[0059] In another embodiment, multiple cooling grooves 210 are provided along the axial direction of the longitudinal beam 140 and multiple cooling grooves 210 are also provided along the flow direction of the coolant, that is, multiple branch channels are provided. Each branch channel is connected in series with multiple cooling grooves 210 to form a matrix distribution of cooling grooves 210. The coolant in the cooling grooves 210 can contact and exchange heat with the matrix-arranged modules 300. The relatively wide cooling channels of the cooling grooves 210 can form multiple branch channels that are first connected in series and then in parallel, which can still maintain the good heat dissipation effect and temperature uniformity of the battery pack as a whole.

[0060] For the housing, please refer to Figure 3. The frame 100 includes two side beams 120, which are spaced apart along the axial direction of the side longitudinal beam 110. The side beams 120 and the side longitudinal beam 110 are connected to form an annular frame 100, which defines the space for mounting the module 300. The frame 100 can be rectangular, square, circular, or other shapes, and this application does not impose any restrictions.

[0061] In one embodiment, referring to Figure 3, the main inlets of the two side longitudinal beams 110 are located on one side of a plurality of modules 300 arranged sequentially along the axial direction of the side longitudinal beams 110. That is, the main inlets are located at the ends of the side longitudinal beams 110, meaning both main inlets are located on the same side of the module 300 along the axial direction of the side longitudinal beams 110. This allows for the diversion or convergence of coolant flow and facilitates pipework arrangement, saving space. In another embodiment, the main inlet of the side longitudinal beams 110 is located in the middle, and cooling grooves 210 are provided on both sides of the main inlet along the axial direction of the side longitudinal beams 110, also allowing for the diversion or convergence of cooling flow. In yet another embodiment, one main inlet of the two side longitudinal beams 110 is located at one end of the axial direction of the side longitudinal beams 110, and the other main inlet is located at the other end of the axial direction of the side longitudinal beams 110. That is, both main inlets are located on both sides of the module 300 along the axial direction of the side longitudinal beams 110, also allowing for the diversion or convergence of cooling flow. In another embodiment, each side longitudinal beam 110 is provided with two main ports, which are located at both ends of the side longitudinal beam 110 in the axial direction, or at the middle of the side longitudinal beam 110, or one main port is at the end of the side longitudinal beam 110 and the other main port is at the middle of the side longitudinal beam 110, and the cooling flow is further distributed or combined through an external pipeline structure.

[0062] In one embodiment, with the main opening of the side longitudinal beam 110 located at the end, the size of the liquid inlet 211 of a plurality of cooling tanks 210 arranged sequentially along the axial direction of the side longitudinal beam 110 increases sequentially in the direction away from the main opening. That is, the size of the liquid inlet 211 of the cooling tanks 210 increases sequentially in the direction of coolant flow. It is understood that the flow rate of the branch flow channel located away from the main opening will be affected by the decrease in water pressure. In order to ensure that the flow rate of each branch flow channel is relatively balanced and thus improve the overall heat exchange effect, the size of the liquid inlet 211 of the plurality of cooling tanks 210 increases in the direction away from the main opening of the liquid inlet channel. This makes the flow resistance of the liquid inlet 211 located near the main opening large and the flow resistance of the liquid inlet 211 located away from the main opening small, thereby achieving the effect of balancing the flow rate in each branch flow channel. In another embodiment, the size of the inlet 211 of the multiple cooling tanks 210 arranged sequentially along the axial direction of the side longitudinal beam 110 can be the same, or it can be increased first and then decreased, or decreased first and then increased. This can also realize that the coolant flows from the main inlet channel to the main outlet channel through the branch channel to cool the module 300.

[0063] In some embodiments, the side longitudinal beam 110 with the liquid inlet main flow channel is provided with an interface 118 that connects one-to-one with the liquid inlets 211 of the multiple cooling tanks 210, and the interface 118 is connected to the cavity 114; the side longitudinal beam 110 with the liquid outlet main flow channel is provided with an interface 118 that connects one-to-one with the liquid outlets 212 of the multiple cooling tanks 210, and the interface 118 is connected to the cavity 114, so as to realize the connection of the liquid inlet main flow channel, the branch flow channels of the cooling tanks 210 and the liquid outlet main flow channel, thereby performing thermal management of the battery module 300.

[0064] In some embodiments, the side longitudinal beam 110 includes a body 111 and a protrusion 112 connected to the body 111. The protrusion 112 has a cavity 114, a main opening, and multiple interfaces 118. The protrusion 112 is fitted and connected to the base plate 200 to achieve the connection between the side longitudinal beam 110 and the base plate 200, and the communication between the cavity 114 and the cooling tank 210, thereby forming a thermal management channel for coolant flow. The protrusion 112 facilitates the fitting of the side longitudinal beam 110 and the base plate 200, thus achieving the connection between the side longitudinal beam 110 and the base plate 200. In actual assembly, the side longitudinal beam 110 and the base plate 200 can be directly fitted together, which is quick and simple to assemble, and has high connection strength and good airtightness. In other embodiments, the body 111 of the side longitudinal beam 110 is directly fitted into the base plate 200, which can also realize the connection between the side longitudinal beam 110 and the base plate 200, as well as the connection between the cavity 114 and the cooling tank 210, thereby forming a thermal management channel for the flow of coolant.

[0065] In some embodiments, referring to Figure 7, the body 111 has multiple chambers 115 arranged sequentially along the height direction. The longitudinal beam structure design of the multiple chambers 115 can improve the structural strength of the longitudinal beams 110 themselves, while reducing weight, and can also serve as a buffer space in the event of a side collision, thereby improving safety. In other embodiments, the body 111 can also be a solid structure, using high-strength steel plate as the processing material, which can also ensure the strength of the frame 100 and improve safety performance.

[0066] In one embodiment, referring to Figure 7, the protrusion 112 may have multiple cavities 114, with the lowest cavity 114 serving as either an inlet or outlet main flow channel, and the remaining cavities 114 serving as reinforcement structures and impact buffer cavities. The protrusion 112 is connected to a main pipe 119, the opening of which forms a main outlet. The main pipe 119 can communicate with other pipes to allow coolant to flow in or out. There is a gap between the module 300 and the side beam 120, with the main pipe 119 located in this gap for easy pipework arrangement.

[0067] In some embodiments where the body 111 has multiple chambers 115, the side longitudinal beam 110 can be a profile, and the cavity 114 of the protrusion 112 and the chambers 115 of the body 111 are all cavities of the side longitudinal beam 110. That is, one of the cavities formed by processing the profile is used as the liquid inlet channel or the liquid outlet channel. This is convenient to manufacture, has high production efficiency, and high structural strength. The cavity can also serve as a side impact buffer space to improve safety. In other embodiments, the side longitudinal beam 110 can also be obtained by casting, which can also form a liquid inlet channel and a liquid outlet channel structure.

[0068] In some embodiments, referring to Figure 7, the protrusion 112 is provided with a fitting protrusion 1121, and the periphery of the base plate 200 is provided with a fitting groove. The fitting protrusion 1121 is located within the fitting groove, allowing for quick connection. During assembly, simply insert the fitting protrusion 1121 of the side longitudinal beam 110 into the fitting groove of the base plate 200, and then weld it. In other embodiments, the protrusion 112 is provided with a fitting groove, and the periphery of the base plate 200 is provided with a fitting protrusion 1121, which is located within the fitting groove, also enabling the connection between the side longitudinal beam 110 and the base plate 200.

[0069] In some embodiments, when the protrusion 112 is provided with a fitting protrusion 1121, the lower part of the protrusion 112 is provided with a notch, the middle part of the protrusion 112 is provided with a groove, and the part of the protrusion 112 located between the groove and the notch forms a fitting protrusion 1121 to increase the wall thickness of the protrusion 112 above the groove, thereby improving the strength of the side longitudinal beam 110; the groove wall of the fitting groove is inserted into the groove, resulting in higher docking stability.

[0070] In some embodiments, multiple interfaces 118 of the longitudinal side beam are located at the fitting protrusion 1121, and the liquid inlet 211 or liquid outlet 212 of the connecting groove is connected to the fitting groove to realize the communication between the cavity 114 and the cooling tank 210. The interfaces 118 are located at the position where the longitudinal side beam and the base plate 200 are connected, and the liquid inlet 211 or liquid outlet 212 is located at the position where the base plate 200 and the longitudinal side beam are connected. This realizes both the docking connection between the longitudinal side beam and the base plate 200 and the communication between the cavity 114 and the cooling tank 210, resulting in a simple structure and rich functionality.

[0071] In one embodiment, referring to Figure 7, the longitudinal side beam and / or side cross beam 120 is provided with a mounting part 113. The mounting part 113 is located on the side of the frame 100 away from the module 300. The mounting part 113 is used to mount the battery pack to the vehicle body to achieve connection and fixation between the battery pack and the vehicle body. When the longitudinal side beam is provided with a mounting part 113, the mounting part 113 is connected to the side of the body 111 away from the protrusion 112. That is, the liquid inlet channel and the mounting structure are integrated into the longitudinal side beam 110, which not only improves the strength of the longitudinal side beam 110 itself, but also ensures the stability of the connection between the longitudinal side beam 110 and the vehicle body. In some embodiments, the mounting part 113 and the body 111 can be an integral structure or a separate structure. The mounting part 113 is provided with multiple chambers 115. When it is an integral structure with the body 111, it can be obtained by profile processing, which is convenient to manufacture, has high production efficiency and high structural strength. The cavity can also serve as a side impact buffer space to improve safety.

[0072] In some embodiments, referring to FIG7, the side longitudinal beam 110 is provided with a first reinforcing plate and a second reinforcing plate. The opposite sides of the first reinforcing plate are a first side and a second side, respectively. The first side is connected to the side of the protrusion 112 away from the body 111, and the second side is connected to the body 111. The first reinforcing plate is inclined, and the first side is lower than the second side to ensure the connection stability between the protrusion 112 and the body 111. The opposite sides of the second reinforcing plate are a third side and a fourth side, respectively. The third side and the fourth side are connected to the mounting part 113 and the body 111, respectively. The second reinforcing plate is inclined, and the third side is lower than the fourth side to ensure the connection stability between the mounting part 113 and the body 111.

[0073] In some embodiments, the outer side of the first reinforcing plate, the outer side of the protrusion 112, and the outer side of the body 111 enclose a first reinforcing cavity 116 extending axially along the side longitudinal beam 110, and / or the outer side of the second reinforcing plate, the outer side of the mounting portion 113, and the outer side of the body 111 also enclose a second reinforcing cavity 117 extending axially along the side longitudinal beam 110. Both the first reinforcing cavity 116 and the second reinforcing cavity 117 can serve as side impact buffer cavities to improve safety performance. In addition, the arrangement of the first reinforcing cavity 116 and the second reinforcing cavity 117 further improves the structural strength of the side longitudinal beam 110.

[0074] In some embodiments, please continue to refer to Figure 7. The height of the first reinforcing plate is higher than that of the protrusion 112. The top plate of the protrusion 112 is inclined, and the inclination direction of the top plate of the protrusion 112 is opposite to that of the first reinforcing plate. The first reinforcing plate, the top plate of the protrusion 112, and the body 111 together form a first reinforcing cavity 116. The top plate of the protrusion 112 is lower on the side connected to the body 111 and higher on the side connected to the first reinforcing plate. Together with the first reinforcing plate, it forms a first reinforcing cavity 116 with an acute-angled triangular cross-section, which is more stable and stronger.

[0075] In some embodiments, please continue to refer to FIG7. The height of the second reinforcing plate is higher than that of the mounting part 113. The body 111 is provided with a third reinforcing plate in the same direction of inclination as the second reinforcing plate. The third reinforcing plate is coplanar with the second reinforcing plate and is located in one of the chambers 115 of the body 111 to divide the chamber 115 into two chambers 115. The third reinforcing plate and the second reinforcing plate jointly bear the downward force of the mounting part 113, resulting in a stable structure with high strength.

[0076] In some embodiments, the cross-sectional area of ​​the cavity 114 in the side longitudinal beam 110, which serves as the main inlet or outlet flow channel, is larger than the cross-sectional area of ​​any other chamber 115 in the side longitudinal beam 110, including the first reinforcing cavity 116 and the second reinforcing cavity 117. This means that the cavity with the largest cross-section in the side longitudinal beam 110 is selected as the main inlet or outlet flow channel to match the large-section branch flow channels of the cooling tank 210, improving the smoothness of coolant flow and thus ensuring the cooling and heat dissipation effect on the module 300. In other embodiments, the cross-sectional dimensions of each cavity in the side longitudinal beam 110 are the same. Selecting a cavity closer to the module 300 as the main flow channel or outlet flow channel also achieves the function of diverting coolant to the branch flow channels of each cooling tank 210 and converging the coolant from the branch flow channels of each cooling tank 210.

[0077] In some embodiments, referring to FIG9, the battery pack includes a heating structure 230 located within a cooling tank 210 to heat the coolant within the cooling tank 210. The coolant heats the module 300 to ensure that the module 300 has a suitable operating temperature in cold ambient temperatures, thereby improving the performance of the battery pack. In another embodiment, the coolant can also be heated by a PTC heater located outside the battery pack in the battery thermal management system, which also ensures that the module 300 has a suitable operating temperature and improves the performance of the battery pack.

[0078] In some embodiments, please continue referring to Figure 9. The heating structure 230 includes a heating wire 231 and an insulating encapsulation film, namely a PET film, covering the heating wire 231. Since the PET film is located in the coolant, the heat generated by heating is transferred to the coolant, improving the thermal energy utilization rate. In other embodiments, the heating structure 230 can also be a PTC electric heater, an electric heater composed of a ceramic heating element and an aluminum tube, which has the advantages of high thermal resistance and high heat exchange efficiency.

[0079] In some embodiments, multiple heating structures 230 may be provided, such as two or three, with multiple heating structures 230 disposed within each cooling tank 210 to improve the heating effect. In other embodiments, the heating effect can also be improved by extending the length of the heating structures 230 to cover the cooling tank 210 as much as possible.

[0080] In some embodiments, the insulating encapsulation film is bonded to the module 300 or the base plate 200 to fix the insulating encapsulation film. In one embodiment, the insulating encapsulation film is located between the module 300 and the baffle column 220, and the insulating encapsulation film and the module 300 are spaced apart to improve heat transfer efficiency. In another embodiment, the insulating encapsulation film is provided with clearance holes for the baffle column 220 to extend into. Relative to the bottom of the cooling tank 210, the insulating encapsulation film is closer to the module 300, that is, the insulating encapsulation film is located in the upper middle layer of the cooling tank 210, which shortens the heat transfer path, improves the heat exchange effect, and avoids coolant stratification.

[0081] In some embodiments, the heating structure 230 is strip-shaped, and the strip-shaped heating structure 230 is curved, such as arranged in a serpentine shape, to increase the heating area and improve the heating effect. In other embodiments, the heating structure 230 can also be tree-shaped or U-shaped, both of which can achieve heating of the coolant.

[0082] Regarding the structure of module 300, in some embodiments, module 300 includes a bottom shell 310, which has a heat dissipation protrusion and a groove for accommodating the battery cell of module 300. The groove forms a heat dissipation protrusion on the outer side of bottom shell 310 to increase the contact area between the battery cell and bottom shell 310 and ensure heat dissipation. In another embodiment, the battery cell can also be located outside the groove, which can also achieve heat exchange and heat dissipation. In yet another embodiment, bottom shell 310 is flat, and the flat bottom shell 310 covers the opening of cooling tank 210 and is compressed by sealing member 260 to achieve a sealed connection between module 300 and cooling tank 210.

[0083] For fixing the module 300, in some embodiments, the module 300 includes two end plates 320 connected to the bottom shell 310. The two end plates 320 are arranged opposite each other along the flow direction of the coolant, and the end plates 320 are connected to the frame 100 and / or the bottom plate 200 to fix the module 300. In other embodiments, the bottom shell 310 is connected to the frame 100 and / or the bottom plate 200, which also achieves the fixing of the module 300.

[0084] In one embodiment, referring to Figures 10 and 11, the middle portion of the end plate 320 protrudes away from the module 300 to form a receiving cavity for accommodating components of the module 300, such as a busbar. The frame 100 and / or the bottom plate 200 are provided with a connecting platform 150 extending toward the module 300. For example, the protrusion 112 is provided with the connecting platform 150. The protruding portion of the end plate 320 is located above or below the connecting platform 150, and the protruding portion of the end plate 320 is connected to the connecting platform 150. By relying on a portion of the inherently protruding structure of the end plate 320 to form the connection structure with the connecting platform 150, the inherently protruding structure of the end plate 320 is utilized, without occupying additional space. This achieves both the fixation of the module 300 and improves space utilization. In another embodiment, the bottom shell 310 is provided with a connecting portion extending toward the frame 100. The connecting portion is located above or below the connecting platform 150, and the connecting portion is connected to the connecting platform 150, which also achieves the fixation of the module 300.

[0085] In some embodiments, the protruding portion of the end plate 320 can be bolted to the connecting platform 150 for easy disassembly and maintenance. In other embodiments, the protruding portion of the end plate 320 is snap-fitted to the connecting platform 150, which also secures the module 300. In some embodiments, the end plate 320 is provided with vent holes to facilitate gas flow.

[0086] In some embodiments, the number of connecting platforms 150 is twice the number of end plates 320, meaning each end plate 320 corresponds to two connecting platforms 150. The two ends of the axial portion of the protruding part of the end plate 320 along the longitudinal beam 110 are respectively connected to two corresponding connecting platforms 150, resulting in high connection stability and a relatively small number of connections, simplifying installation and disassembly. A receiving cavity for the module 300 parts is formed in the middle of the protruding part of the end plate 320 along the axial portion of the longitudinal beam 140, which can be offset from the connecting platforms 150 and improve space utilization. When multiple modules 300 are provided along the axial portion of the longitudinal beam 110, two adjacent modules 300 are connected and fixed through the same connecting platform 150 to improve space utilization and reduce processing difficulty.

[0087] Referring to Figure 9, the housing also includes a crossbeam 130 and a longitudinal beam 140. Both the crossbeam 130 and the longitudinal beam 140 are connected to the base plate 200. The two ends of the crossbeam 130 are respectively connected to two side longitudinal beams 110, and the two ends of the longitudinal beam 140 are respectively connected to two side crossbeams 120 of the frame 100, so as to enclose multiple cavities for accommodating modules 300. Dividing the housing into multiple areas using the crossbeams 130 and the longitudinal beams 140 can improve the strength of the housing. The longitudinal beams 140 and / or the base plate 200 are provided with connecting platforms 150, and the end plates 320 of the modules 300 are connected to the connecting platforms 150. In some embodiments, the crossbeam 130 is provided with mounting points for mounting to the vehicle body. The mounting points of the crossbeam 130 and the mounting portions 113 of the side longitudinal beams 110 together realize the connection between the battery pack and the vehicle body.

[0088] In some embodiments, there is a gap between the module 300 and one of the side beams 120 to form a space for accommodating a controller (BMS), which is a battery management system for managing the cooling and heating of the module 300. The controller includes control units, such as a master control unit and a slave control unit. The control unit generally includes a mounting plate, a cover, and a control circuit board located in the space enclosed by the mounting plate and the cover.

[0089] The working principle of the battery pack provided in this application is as follows:

[0090] Coolant enters from the main pipe 119 into the main inlet channel of one side longitudinal beam 110, and then flows through the main inlet channel to the cooling tanks 210 of each branch channel. The cooling tanks 210 are filled with coolant, and the coolant directly washes and cools the corresponding module 300. Under the turbulence of the baffle column 220 and the PET heating film, the coolant gradually flows from the inlet 211 to the outlet 212. After the coolant comes into contact with the bottom of the module 300 for heat exchange, it is discharged through the outlet 212 into the series-connected cooling tanks 210. The coolant directly washes and cools the corresponding module 300, and under the turbulence of the baffle column 220 and the PET heating film, it gradually flows from the inlet 211 to the outlet 212. After the coolant comes into contact with the bottom of the module 300 for heat exchange, it flows through the outlet 212 to the main outlet channel of another side longitudinal beam 110, and finally is discharged from another main pipe 119.

[0091] In low-temperature conditions, the battery high voltage supplies power to the PET heating film, rapidly raising the temperature of the coolant. The heated coolant then heats the battery, quickly raising its temperature above 0°C, which significantly improves fast charging and low-temperature battery life.

[0092] The battery pack of this application uses the cavities of two side longitudinal beams as the main inlet and outlet channels for coolant flow. Simultaneously, a cooling groove 210 is formed on the bottom plate 200 of the housing. The bottom plate 200 and the module 300 together form a branch flow channel, reducing the number of battery pack parts, simplifying the battery pack structure, and improving the battery pack assembly efficiency. Furthermore, the coolant within the branch flow channel formed by the bottom plate 200 and the module 300 can directly contact and scour the module 300 for cooling, improving the cooling effect of the module 300, ensuring the temperature uniformity of the battery module 300, and having a significant positive effect on improving battery cooling efficiency, reducing temperature differences between cells, and reducing energy consumption.

[0093] The connection point between the side longitudinal beam 110 and the base plate 200 integrates a connecting structure between the cooling groove 210 and the cavity of the side longitudinal beam, eliminating the need for additional connecting parts, simplifying the battery pack structure, and improving battery pack assembly efficiency. It also achieves the integration of multiple structures, saving space and improving space utilization.

[0094] Both side longitudinal beams 110 are profiles, which are easy to process. The largest cavity 114 inside the profile is used as the main inlet or outlet flow channel, which not only improves the structural strength of the side longitudinal beams 110, but also provides a flow channel for coolant.

[0095] A second aspect of this application provides a vehicle including a battery pack according to any embodiment of the first aspect.

[0096] Vehicles equipped with the above-mentioned battery packs have battery pack modules 300 that can be directly contacted and cooled by the coolant, resulting in good heat dissipation. Therefore, the temperature uniformity of each cell is high, the battery pack performs well, and the vehicle's driving range is improved.

[0097] The vehicle includes a power unit and a coolant tank. The coolant tank, power unit, and inlet of the coolant inlet are connected, allowing the coolant in the tank to flow into the coolant inlet under the drive of the power unit for thermal management of the battery pack. The outlet of the coolant inlet is connected to the coolant tank, allowing the coolant after cooling the module 300 to flow back into the coolant tank through the outlet.

[0098] The battery pack and vehicle provided in this application have at least the following advantages:

[0099] (1) The modules 300 are arranged in a certain series and parallel manner on the box. At the same time, the two side longitudinal beams 110 serve as the main inlet and outlet channels for the coolant. Meanwhile, a cooling channel 210 is opened on the bottom plate 200 of the box. This realizes the direct contact cooling between the modules 300 and the coolant, which improves the cooling effect, ensures the temperature uniformity of the battery modules 300, and simplifies the structure of the battery pack. It has high creative value, strong feasibility, and has a significant positive effect on improving battery cooling efficiency, reducing temperature difference between cells and energy consumption.

[0100] (2) The bottom plate 200 is milled with a cooling groove 210, an inlet 211 and an outlet 212, which are connected to the two side longitudinal beams 110 by friction stirring welding. The process opening is sealed by adding a patch. The processing technology is simple.

[0101] (3) Both side longitudinal beams 110 are profiles, which are easy to process. The largest cavity 114 inside the profile is used as the liquid inlet or liquid outlet channel, which not only improves the structural strength of the side longitudinal beams 110, but also provides a flow channel for coolant.

[0102] (4) The side longitudinal beam 110 integrates the liquid inlet main flow channel or the liquid outlet main flow channel, and the bottom plate 200 integrates the cooling tank 210 type branch flow channel. The side longitudinal beam 110 is then connected to the floor through the interlocking structure. The structure is simple and ingenious, with high integration, saving space. The cross-sectional area of ​​the coolant flow channel is large, smooth and not easy to block, with good cooling effect, and can also improve the assembly efficiency of the battery pack.

[0103] (5) The profile side longitudinal beam 110 has a protrusion 112 that is connected to the bottom plate 200 and a mounting part 113 that is mounted on the vehicle body on both sides along its own width direction. It has high integration and high structural strength, but is lightweight, which has a positive effect on improving the vehicle's range.

[0104] (6) The module 300 is connected to the side longitudinal beam 110 or the base plate 200 by bolts, and an O-ring is added at the junction of the base plate 200 and the bottom shell 310 of the module 300. The compression of the O-ring ensures that the coolant is sealed in the cooling tank 210, which makes it less prone to leakage and improves the safety of battery operation.

[0105] (7) A PET heating film is arranged in the branch flow channel of the cooling tank 210 to heat the coolant at low temperature, thereby increasing the temperature of the module 300 and ensuring the working performance of the battery.

[0106] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0107] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0108] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0109] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0110] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, comprising: The housing includes a connected base plate and a frame. The base plate is provided with a cooling tank and an inlet and an outlet connected to the cooling tank. The two side longitudinal beams of the frame are each provided with a cavity and a main opening connected to the cavity. The cavity of one side longitudinal beam is connected to the inlet of the cooling tank, and the cavity of the other side longitudinal beam is connected to the outlet of the cooling tank. The module covers the opening of the cooling tank to exchange heat with the coolant in the cooling tank.

2. The battery pack according to claim 1, wherein, The base plate is provided with multiple baffle columns, which are located within the cooling tank.

3. The battery pack according to claim 2, wherein, The turbulence-disrupting columns are spaced apart from the module.

4. The battery pack according to any one of claims 1-3, wherein, It also includes a heating structure located within the cooling tank.

5. The battery pack according to claim 4, wherein, The heating structure includes a heating wire and an insulating encapsulation film covering the heating wire. The insulating encapsulation film is adhered to the module or the base plate.

6. The battery pack according to claim 5, wherein, The heating structure is strip-shaped, and the strip-shaped heating structure is curved.

7. The battery pack according to any one of claims 1-3, wherein, The number of cooling tanks is the same as the number of modules, and there are multiple of each. Each module covers the corresponding cooling tank.

8. The battery pack according to claim 7, wherein, The multiple cooling tanks are arranged sequentially along the flow direction of the coolant, and the multiple cooling tanks are connected in series; and / or; The multiple cooling tanks are arranged sequentially along the axial direction of the side longitudinal beam, and the multiple cooling tanks are connected in parallel.

9. The battery pack according to claim 8, wherein, The main opening of the side longitudinal beam is located on one side of a plurality of modules arranged sequentially along the axial direction of the side longitudinal beam, and the liquid inlet size of the plurality of cooling tanks arranged sequentially along the axial direction of the side longitudinal beam increases sequentially in the direction away from the main opening.

10. The battery pack according to any one of claims 1-3, wherein, The side longitudinal beam includes a body and a protrusion connected to the body. The protrusion is provided with the cavity and the main opening. The protrusion is fitted and connected to the bottom plate.

11. The battery pack according to claim 10, wherein, The protrusion is provided with a fitting protrusion, and the periphery of the base plate is provided with a fitting groove, with the fitting protrusion located in the fitting groove.

12. The battery pack according to any one of claims 1-3, wherein, The module includes a bottom shell and two end plates connected to the bottom shell, the end plates being connected to the frame and / or the bottom plate.

13. The battery pack according to claim 12, wherein, The middle portion of the end plate protrudes away from the module to form a receiving cavity for accommodating module parts. The frame and / or the bottom plate are provided with a connecting platform extending toward the module. The protruding portion of the end plate is located above or below the connecting platform, and the protruding portion of the end plate is connected to the connecting platform.

14. The battery pack according to any one of claims 1-3, wherein, The base plate is provided with an annular groove surrounding the cooling tank, and the module is sealed and covered by a sealing element located in the annular groove.

15. A vehicle comprising the battery pack of any one of claims 1-14.

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