Liquid cooling system for power battery pack

Abstract

The invention discloses a liquid cooling system for a power battery pack, and the liquid cooling system comprises a battery frame, a liquid cooling plate, a connection assembly, a heat conduction plate and a battery module. A connecting pipe, communicated with a refrigerant outlet and a refrigerant inlet of the liquid cooling plate, on the connecting assembly is arranged on the side face of the battery pack, intensive arrangement of a heat management system is facilitated, arrangement space is optimized, and the space utilization rate is increased, meanwhile, the liquid cooling plate serves as an upper shell of the battery pack and also serves as a vehicle body floor, and the battery pack and a vehicle body form a CTC structure; the overall height of the battery pack is reduced, so that space utilization in the battery pack is more reasonable, the energy density ratio of the battery pack is effectively improved, lightweight design of a whole vehicle and overall processing and quality control of the battery pack are facilitated, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile battery cooling, and in particular to a liquid cooling system for a power battery pack. Background Art

[0002] The cooling system of new energy plug-in hybrid (including extended range) vehicles mainly includes drive motor cooling, engine cooling, and power battery cooling. Since pure electric vehicles do not have engines, they only have power battery cooling and drive motor cooling.

[0003] The main functions of the cooling system of electric vehicles are: on the one hand, it allows key components of the power system to work within a suitable temperature range to prevent the performance of the battery cells from being damaged due to excessive temperature, thus affecting the performance and life of the entire battery pack; on the other hand, the cooling system also affects the energy utilization of the entire vehicle. For pure electric vehicles, the cooling system will consume some energy during operation, thus affecting the vehicle's driving range. Therefore, the cooling efficiency of the electric vehicle cooling system is crucial to the design of the entire vehicle.

[0004] According to different cooling methods, battery pack cooling technology can be divided into air cooling, liquid cooling and direct cooling.

[0005] Air cooling technology includes passive air cooling and active air cooling: passive air cooling usually directly uses external air / crew cabin air as the medium; active air cooling is to preheat or precool the external air through air conditioning before entering the battery system and battery pack for heat exchange. The advantages are simple structure, light weight, effective removal of harmful gases, and low cost; the disadvantages are relatively low heat transfer coefficient, slow speed, low efficiency, poor internal temperature uniformity, which has a great impact on the battery life.

[0006] Liquid cooling technology uses liquid convection heat exchange to remove the heat generated by the battery, thereby reducing the battery temperature. It is the most mainstream cooling solution on the market. Its advantages are high thermal management efficiency, precise temperature control, good consistency management performance, the system can also heat the battery pack under low temperature conditions, and the layout of the liquid cooling system is relatively flexible. The disadvantages of liquid-cooled batteries are that the structure is more complex and the cost is higher, it increases the volume of the battery pack, encroaches on the cabin space, and is equivalent to reducing energy density.

[0007] Direct cooling technology uses the principle of latent heat of evaporation of refrigerant to establish an air-conditioning system in the whole vehicle or battery system, and install the evaporator of the air-conditioning system in the battery system. The refrigerant evaporates in the evaporator and quickly and efficiently removes the heat from the battery system, thereby completing the cooling of the battery system. The advantage is that the refrigerant plate is simpler in design and can be detached, and the cooling system can be easily replaced or even repaired. The disadvantage is that the consistency is difficult to control and the technical difficulty is high.

[0008] At present, the most widely used technology in the market is liquid cooling, and the core component of the liquid cooling solution is the water cooling plate. There are usually four solutions to improve the thermal conductivity of the water cooling plate, namely, improving the thermal conductivity of the cold plate itself (material); improving the thermal conductivity of the interface between the cold plate and the battery cell; adjusting the flow channel design to increase the contact area between the cold plate and the battery cell and the heat exchange effect of the fluid itself; optimizing the layout of the cold plate.

[0009] Some models also use side cooling of the battery cells. For example, in the liquid cooling solution with serial flow channels, the cold plate is installed in the battery gap. This design ensures that each cylindrical battery cell can be in direct contact with the water plate, but the serpentine cold plate greatly increases the pressure loss of the liquid cooling system. Summary of the invention

[0010] In view of the deficiencies in the prior art, the present invention provides a liquid cooling system for a power battery pack that is easy to process and has high cooling efficiency.

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0012] The present application provides a liquid cooling system for a power battery pack, comprising:

[0013] Battery module;

[0014] A battery frame, having an accommodating cavity with an opening facing away from the ground and used to accommodate the battery module;

[0015] A liquid cooling plate, used for the vehicle body floor, detachably connected to the battery frame and capable of covering the opening of the accommodating cavity, with a cooling channel inside, and a refrigerant outlet and a refrigerant inlet in communication with the cooling channel on the side close to the ground;

[0016] A connection assembly is fixedly arranged on the horizontal outer surface of the battery frame and has two connection pipes respectively connected to the refrigerant outlet and the refrigerant inlet of the liquid cooling plate;

[0017] A heat conducting plate is disposed between the liquid cooling plate and the battery module, and is in contact with the liquid cooling plate and the battery module in a vertical direction respectively;

[0018] The connecting pipe is in an "L" shape, and one end thereof is connected to the refrigerant outlet or the refrigerant inlet on the liquid cooling plate, and the other end extends in a horizontal direction away from one side of the battery frame.

[0019] It is further defined that the above-mentioned liquid cooling system for a power battery pack, wherein the battery frame comprises a base plate for mounting on a vehicle body and an outer frame body fixedly disposed on an end surface of the base plate on a side away from the ground, and the outer frame body is provided with a cavity opening to a side away from the base plate;

[0020] Wherein, longitudinal beams and transverse beams are fixedly arranged in the cavity of the outer frame, and the longitudinal beams and transverse beams cross each other to divide the cavity of the outer frame into a plurality of accommodating cavities.

[0021] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, the outer frame is configured as a rectangular structure formed by four sealing plates, and two adjacent sealing plates are connected by laser welding;

[0022] The sealing plate and the base plate are fixedly connected via FDS, and structural adhesive is provided at the connection between the sealing plate and the base plate.

[0023] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, the liquid cooling plate is fixedly connected to the battery frame via an FDS;

[0024] And / or, the liquid cooling plate is fixedly connected to the battery frame via a plurality of locking members.

[0025] Further defined, in the above-mentioned liquid cooling system for a power battery pack, two lock sleeves are fixedly provided on the longitudinal beam and the cross beam of the battery frame respectively, the four lock sleeves are distributed in a diamond shape, and four lock holes are respectively provided on the liquid cooling plate at positions corresponding to the four lock sleeves;

[0026] Among them, a through hole connected to the lock sleeve at the corresponding position is provided on the substrate of the battery frame, and the locking element is specifically configured as a bolt and a nut cooperating with the bolt. The bolt can pass through the lock sleeve and the lock hole at the corresponding position from the through hole on the substrate. After the nut is connected to the bolt, it can abut the outer surface of the liquid cooling plate away from the battery frame.

[0027] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, a sealing gasket is provided between the liquid cooling plate and the battery frame.

[0028] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, the connection assembly further comprises a fixing frame fixedly arranged on the horizontal outer surface of the battery frame, and the connection pipe is fixedly arranged on the fixing frame;

[0029] Two refrigerant flow nozzles connected to the cooling channel are fixedly provided on the end surface of the liquid cooling plate close to the battery frame, and the two refrigerant flow nozzles are respectively configured as a refrigerant outlet and a refrigerant inlet;

[0030] The two connecting pipes are respectively sleeved on the refrigerant flow nozzles at corresponding positions, and an O-type rubber ring is provided between the connecting pipe and the refrigerant flow nozzle.

[0031] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, a plurality of spoiler grooves are provided in a rectangular array in the cooling flow channel;

[0032] The cooling channel is stepped at the edge of the liquid cooling plate, and its height decreases in the vertical direction.

[0033] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, the liquid cooling plate comprises a bottom plate and a top plate fixedly arranged on a side of the bottom plate away from the ground;

[0034] The end surface of the bottom plate away from the top plate can abut against the heat conducting plate, and the cooling channel is located between the bottom plate and the top plate.

[0035] It is further defined that in the above-mentioned liquid cooling system for a power battery pack, the liquid cooling plate is made of a three-series aluminum alloy material;

[0036] And / or, the liquid cooling plate is formed by a progressive die stamping-brazing composite process.

[0037] The present invention has at least the following beneficial effects:

[0038] 1. The upper cooling solution is adopted. The bottom of the liquid cooling plate is closely connected with the battery module through the heat conducting plate. The heat generated by the battery module is transferred to the liquid cooling plate through the heat conducting plate, and finally the heat is taken away by the circulating liquid in the liquid cooling plate. The connecting pipe connected to the refrigerant outlet and refrigerant inlet of the liquid cooling plate on the connecting assembly is arranged on the side of the battery pack, which is convenient for the intensive arrangement of the thermal management system, optimizes the arrangement space, and improves the space utilization rate. At the same time, the liquid cooling plate is used as the upper shell of the battery pack on the one hand, and as the body floor on the other hand, so that the battery pack and the body form a CTC structure, which reduces the overall height of the battery pack, makes the space utilization in the battery pack more reasonable, effectively improves the energy density ratio of the battery pack, facilitates the lightweight design of the whole vehicle, and the overall processing and quality control of the battery pack, and reduces the manufacturing cost;

[0039] 2. Through FDS connection technology and four locks from bottom to top fastening system, it can ensure uniform pressure on the contact surface between the liquid cooling plate and the heat conducting plate, reduce the thermal resistance of the distributed interface, effectively improve the thermal contact efficiency, and reduce the assembly process;

[0040] 3. The edge of the cooling channel adopts a trapezoidal cross-section structure, which can reduce the flow resistance coefficient when combined with the spoiler groove. At the same time, the distribution parameters of the spoiler groove are optimized through CFD simulation, which can effectively eliminate the coolant retention area, improve the uniformity of temperature distribution, and improve the cooling dead corner problem existing in traditional flow channels;

[0041] 4. The liquid cooling plate is formed by a stamping-brazing composite process. It has a large contact area, good heat exchange effect, pressure resistance and structural strength, and can achieve high dimensional accuracy control, which is suitable for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1This is a schematic diagram of the structure of a liquid cooling system for a power battery pack according to an embodiment of the present application;

[0043] Figure 2 This is a schematic diagram of an exploded structure of a liquid cooling system for a power battery pack according to an embodiment of the present application;

[0044] Figure 3 This is a schematic structural diagram of the "battery frame 100" part of the liquid cooling system for a power battery pack in an embodiment of the present application;

[0045] Figure 4 This is a schematic diagram of the coordination of the “liquid cooling plate 200 and the connection assembly 300” in the liquid cooling system for a power battery pack in an embodiment of the present application;

[0046] Figure 5 This is a structural cross-sectional view of the "liquid cooling plate 200 and the connection assembly 300" part of the liquid cooling system for the power battery pack in the embodiment of the present application;

[0047] Figure 6 It is a partial cross-sectional view of the “liquid cooling plate 200” in the liquid cooling system for a power battery pack according to an embodiment of the present application.

[0048] Reference numerals

[0049] Battery frame 100, outer frame 110, substrate 120, longitudinal beam 130, cross beam 140, accommodating cavity 150, locking sleeve 160, liquid cooling plate 200, bottom plate 201, top plate 202, locking hole 210, refrigerant flow nozzle 220, cooling channel 230, connecting assembly 300, fixing frame 310, connecting pipe 320, heat conducting plate 400, battery module 500, locking piece 600. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0051] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0052] The liquid cooling system for a power battery pack provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0053] like Figures 1 to 6 As shown, an embodiment of the present application provides a liquid cooling system for a power battery pack, including a battery frame 100, a liquid cooling plate 200, a connection assembly 300, a heat conducting plate 400, and a battery module 500.

[0054] The battery frame 100 is provided with a receiving cavity 150 which opens to a side away from the ground and is used to receive the battery module 500. The liquid cooling plate 200 is detachably connected to the battery frame 100 and can cover the opening of the receiving cavity 150. The heat conducting plate 400 is arranged between the liquid cooling plate 200 and the battery module 500 and is respectively in contact with the liquid cooling plate 200 and the battery module 500.

[0055] A cooling channel 230 is provided in the liquid cooling plate 200, and a refrigerant outlet and a refrigerant inlet connected to the cooling channel 230 are provided on the side close to the ground. The connecting assembly 300 is fixedly arranged on the horizontal outer surface of the battery frame 100, and has two connecting pipes 320 respectively connected to the refrigerant outlet and the refrigerant inlet on the liquid cooling plate 200.

[0056] The liquid cooling plate 200 is used for the vehicle body floor, the connecting pipe 320 is "L"-shaped, and one end thereof is connected to the refrigerant outlet or the refrigerant inlet on the liquid cooling plate 200, and the other end extends in the horizontal direction away from the battery frame 100.

[0057] It is understandable that the end of the connecting pipe 320 away from the battery frame 100 can be connected to a water pump, so as to realize the circulation of the cooling liquid in the liquid cooling plate 200 .

[0058] In the embodiment of the present application, the above-mentioned liquid cooling system for a power battery pack is adopted, and an upper cooling scheme is adopted. The bottom of the liquid cooling plate 200 is tightly connected to the battery module 500 through the heat conducting plate 400. The heat generated by the battery module 500 is transmitted to the liquid cooling plate 200 through the heat conducting plate 400, and finally the heat is taken away by the circulating liquid in the liquid cooling plate 200. The connecting pipe 320 on the connecting assembly 300, which is connected to the refrigerant outlet and the refrigerant inlet of the liquid cooling plate 200, is arranged on the side of the battery pack, which is convenient for the intensive arrangement of the thermal management system, optimizes the arrangement space, and improves the space utilization rate. At the same time, the liquid cooling plate 200 is used as the upper shell of the battery pack on the one hand, and as the vehicle body floor on the other hand, so that the battery pack and the vehicle body form a CTC structure, which reduces the overall height of the battery pack, makes the space utilization in the battery pack more reasonable, effectively improves the energy density ratio of the battery pack, and facilitates the lightweight design of the whole vehicle, as well as the overall processing and quality control of the battery pack, and reduces the manufacturing cost.

[0059] In a preferred embodiment, Figures 1 to 3 As shown, the battery frame 100 includes a substrate 120 for installation on a vehicle body and an outer frame 110 fixedly disposed on an end surface of the substrate 120 away from the ground. The outer frame 110 is provided with a cavity opening to a side away from the substrate 120 .

[0060] A longitudinal beam 130 and a transverse beam 140 are fixedly disposed in the cavity of the outer frame 110 . The longitudinal beam 130 and the transverse beam 140 cross each other to divide the cavity of the outer frame 110 into a plurality of accommodating cavities 150 .

[0061] In a preferred embodiment, the outer frame 110 is configured as a rectangular structure formed by four sealing plates, and two adjacent sealing plates are connected by laser welding.

[0062] The sealing plate and the base plate 120 are fixedly connected by FDS (flow drill screws), and structural adhesive is provided at the connection between the sealing plate and the base plate 120, so as to ensure the structural strength of the outer frame 110 and the sealing performance of the battery pack.

[0063] In a preferred embodiment, Figure 1 , Figure 2 As shown, the liquid cooling plate 200 and the battery frame 100 are fixedly connected by FDS (flow drill screws), thereby ensuring the overall structural strength of the battery pack.

[0064] In a preferred embodiment, Figures 1 to 4 As shown, the liquid cooling plate 200 and the battery frame 100 are fixedly connected via a plurality of locking members 600 .

[0065] In a preferred embodiment, Figures 1 to 4As shown, two locking sleeves 160 are fixedly disposed on the longitudinal beam 130 and the transverse beam 140 , respectively. The four locking sleeves 160 are distributed in a diamond shape. Four locking holes 210 are respectively penetrated through the corresponding positions of the four locking sleeves 160 on the liquid cooling plate 200 .

[0066] Among them, a through hole connected to the corresponding position lock sleeve 160 is provided on the base plate 120, and the locking element 600 is specifically configured as a bolt and a nut cooperating with the bolt. The bolt can pass through the corresponding position lock sleeve 160 and the lock hole 210 from the through hole on the base plate 120. After the nut and the bolt are connected, they can abut the outer surface of the liquid cooling plate 200 away from the battery frame 100.

[0067] It is understandable that through the FDS connection technology and the four locks 600 fastening system from bottom to top, it is possible to ensure that the contact surface pressure between the liquid cooling plate 200 and the heat conducting plate 400 is uniform, reduce the distributed interface thermal resistance, effectively improve the thermal contact efficiency, and reduce the assembly process.

[0068] In a preferred embodiment, two locking sleeves 160 are fixedly disposed on the longitudinal beam 130 and the transverse beam 140 , respectively. The four locking sleeves 160 are distributed in a diamond shape, and four locking holes 210 are respectively provided through the liquid cooling plate 200 at positions corresponding to the four locking sleeves 160 .

[0069] The locking element 600 is specifically configured as a bolt, and can penetrate the locking hole 210 and be threadedly connected to the locking sleeve 160 at the corresponding position.

[0070] It is understandable that the connection method between the liquid cooling plate 200 and the battery frame 100 is not limited to the above embodiment, as long as the installation strength of the liquid cooling plate 200 on the battery frame 100 can be guaranteed, which will not be elaborated here.

[0071] In a preferred embodiment, a sealing gasket is provided between the liquid cooling plate 200 and the battery frame 100 to ensure the sealing performance of the battery pack.

[0072] In a preferred embodiment, the extension direction of the cooling channel 230 is perpendicular to the direction of the battery cells of the battery module 500 .

[0073] It can be understood that the cooling channel 230 and the battery cell orientation setting of the battery module 500 are conducive to maintaining the consistency of the temperature of the battery cell monomers and improving the overall cooling efficiency of the battery pack. At the same time, the liquid cooling plate 200 can better protect the safety of the occupants when the battery module 500 thermally runs away.

[0074] In a preferred embodiment, Figures 1 to 5 As shown, the connection assembly 300 further includes a fixing frame 310 fixedly disposed on the horizontal outer surface of the battery frame 100 , and the connection tube 320 is fixedly disposed on the fixing frame 310 .

[0075] Two refrigerant flow nozzles 220 connected to the cooling channel 230 are fixedly provided on the end surface of the liquid cooling plate 200 close to the battery frame 100. The two refrigerant flow nozzles 220 are respectively configured as a refrigerant outlet and a refrigerant inlet.

[0076] The two connecting pipes 320 are respectively sleeved on the refrigerant flow nozzles 220 at corresponding positions.

[0077] It is understandable that the connection method between the connecting pipe 320 and the refrigerant flow nozzle 220 is not limited to the above-mentioned one. For example, the refrigerant flow nozzle 220 can also be set to be sleeved on the connecting pipe 320. As long as the connection between the two can be guaranteed, it will not be elaborated here.

[0078] In a preferred embodiment, an O-type rubber ring is provided between the connecting pipe 320 and the refrigerant flow nozzle 220 .

[0079] It is understandable that the O-ring can improve the sealing performance of the connection between the connecting pipe 320 and the refrigerant flow nozzle 220, thereby ensuring the pressure resistance performance.

[0080] In a preferred embodiment, Figure 6 As shown, a plurality of spoiler grooves are provided in a rectangular array in the cooling channel 230 .

[0081] The cooling channel 230 is stepped at the edge of the liquid cooling plate 200 , and its height decreases in the vertical direction.

[0082] It can be understood that the edge of the cooling channel 230 adopts a trapezoidal cross-sectional structure, which, combined with the spoiler groove, can reduce the flow resistance coefficient. At the same time, the distribution parameters of the spoiler groove are optimized through CFD (computational fluid dynamics) simulation, which can effectively eliminate the coolant retention area, improve the uniformity of temperature distribution, and improve the cooling dead corner problem existing in traditional channels.

[0083] In a preferred embodiment, Figure 6 As shown, the liquid cooling plate 200 includes a bottom plate 201 and a top plate 202 fixedly disposed on a side of the bottom plate 201 away from the ground.

[0084] The end surface of the bottom plate 201 away from the top plate 202 can abut against the heat conducting plate 400 , and the cooling channel 230 is located between the bottom plate 201 and the top plate 202 .

[0085] In a preferred embodiment, the liquid cooling plate 200 is made of a three-series aluminum alloy material.

[0086] It is understandable that the three-series aluminum alloy has low density, high specific strength, easy processing and other advantages. It is currently an ideal automotive lightweight material. It still has good anti-rust ability in a humid environment, high plasticity, and is easy to stamp and stretch, and can meet the processing requirements of the liquid cooling plate 200.

[0087] In a preferred embodiment, the liquid cooling plate 200 is formed by a progressive die stamping-brazing composite process.

[0088] Specifically, the bottom plate 201 and the top plate 202 are stamped by a press and a mold to produce plastic deformation on the aluminum material, thereby forming the bottom plate 201, the top plate 202 and the flow channel structure. The bottom plate 201 and the top plate 202 are fixed by brazing.

[0089] It is understandable that the liquid cooling plate 200 is formed by a stamping-brazing composite process, has a large contact area, has good heat exchange effect, pressure resistance and structural strength, and can achieve high dimensional accuracy control, and is suitable for mass production.

[0090] In a preferred embodiment, the battery module 500 is fixedly connected to the base plate 120 by screws.

[0091] It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0092] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A liquid cooling system for a power battery pack, characterized in that: include: Battery module; A battery frame, having an accommodating cavity with an opening facing away from the ground and used to accommodate the battery module; A liquid cooling plate, used for the vehicle body floor, detachably connected to the battery frame and capable of covering the opening of the accommodating cavity, with a cooling channel inside, and a refrigerant outlet and a refrigerant inlet in communication with the cooling channel on the side close to the ground; A connection assembly is fixedly arranged on the horizontal outer surface of the battery frame and has two connection pipes respectively connected to the refrigerant outlet and the refrigerant inlet of the liquid cooling plate; A heat conducting plate is disposed between the liquid cooling plate and the battery module, and is in contact with the liquid cooling plate and the battery module in a vertical direction respectively; The connecting pipe is "L"-shaped, and one end thereof is connected to the refrigerant outlet or the refrigerant inlet on the liquid cooling plate, and the other end extends in a horizontal direction away from one side of the battery frame.

2. A liquid cooling system for a power battery pack according to claim 1, characterized in that: The battery frame includes a base plate for mounting on a vehicle body and an outer frame body fixedly disposed on an end surface of the base plate away from the ground, wherein the outer frame body is provided with a cavity opening to a side away from the base plate; Wherein, longitudinal beams and transverse beams are fixedly arranged in the cavity of the outer frame, and the longitudinal beams and transverse beams cross each other to divide the cavity of the outer frame into a plurality of accommodating cavities.

3. A liquid cooling system for a power battery pack according to claim 2, characterized in that: The outer frame is configured as a rectangular structure formed by four sealing plates, and two adjacent sealing plates are connected by laser welding; The sealing plate and the base plate are fixedly connected via FDS, and structural adhesive is provided at the connection between the sealing plate and the base plate.

4. A liquid cooling system for a power battery pack according to any one of claims 1 to 3, characterized in that: The liquid cooling plate is fixedly connected to the battery frame via FDS; And / or, the liquid cooling plate is fixedly connected to the battery frame via a plurality of locking members.

5. A liquid cooling system for a power battery pack according to claim 4, characterized in that: Two lock sleeves are fixedly provided on the longitudinal beam and the transverse beam of the battery frame, respectively, and the four lock sleeves are distributed in a diamond shape, and four lock holes are respectively provided on the liquid cooling plate at positions corresponding to the four lock sleeves; Among them, a through hole connected to the lock sleeve at the corresponding position is provided on the substrate of the battery frame, and the locking element is specifically configured as a bolt and a nut cooperating with the bolt. The bolt can pass through the lock sleeve and the lock hole at the corresponding position from the through hole on the substrate. After the nut is connected to the bolt, it can abut the outer surface of the liquid cooling plate away from the battery frame.

6. The liquid cooling system for a power battery pack according to claim 1, characterized in that: A sealing gasket is provided between the liquid cooling plate and the battery frame.

7. The liquid cooling system for a power battery pack according to claim 1, characterized in that: The connection assembly also includes a fixing frame fixedly arranged on the horizontal outer surface of the battery frame, and the connection tube is fixedly arranged on the fixing frame; Two refrigerant flow nozzles connected to the cooling channel are fixedly provided on the end surface of the liquid cooling plate close to the battery frame, and the two refrigerant flow nozzles are respectively configured as a refrigerant outlet and a refrigerant inlet; The two connecting pipes are respectively sleeved on the refrigerant flow nozzles at corresponding positions, and an O-type rubber ring is provided between the connecting pipe and the refrigerant flow nozzle.

8. The liquid cooling system for a power battery pack according to claim 1, characterized in that: A plurality of spoiler grooves are arranged in a rectangular array in the cooling channel; The cooling channel is stepped at the edge of the liquid cooling plate, and its height decreases in the vertical direction.

9. The liquid cooling system for a power battery pack according to claim 1, characterized in that: The liquid cooling plate comprises a bottom plate and a top plate fixedly arranged on a side of the bottom plate away from the ground; The end surface of the bottom plate away from the top plate can abut against the heat conducting plate, and the cooling channel is located between the bottom plate and the top plate.

10. A liquid cooling system for a power battery pack according to claim 8 or 9, characterized in that: The liquid cooling plate is made of three series aluminum alloy material; And / or, the liquid cooling plate is formed by a progressive die stamping-brazing composite process.

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