Battery box assembly and battery pack

Abstract

This application provides a battery box assembly and a battery pack, relating to the field of battery pack energy storage technology. The battery box assembly provided by this application includes a box frame, a first cooling assembly, a box cover, and a second cooling assembly. The first cooling assembly is connected to the bottom of the box frame; the box cover is connected to the top of the box frame; the second cooling assembly is connected to the side of the box cover facing the first cooling assembly. The box frame, the first cooling assembly, and the box cover together form a receiving cavity for housing a battery cell module. The first and second cooling assemblies are respectively used to dissipate heat at opposite ends of the battery cell module. By setting the first cooling assembly to dissipate heat at the bottom of the battery cell module and the second cooling assembly to dissipate heat at the top of the battery cell module, a dual heat dissipation path is formed, enhancing heat dissipation in the top area of ​​the battery cell module where heat generation is severe, improving the temperature uniformity of the battery cell module, reducing the overall temperature difference of the battery cell module, and thus improving the heat dissipation effect of the battery pack.

Description

Technical Field

[0001] This application relates to battery pack energy storage technology, and more particularly to a battery box assembly and battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage industries, the energy density and charge / discharge rate of battery packs are constantly increasing, and the heat generated during their operation is significantly increasing, posing a more severe challenge to the performance of thermal management systems. To solve the heat dissipation problem, related technologies employ immersing the battery cells in an insulating immersion liquid located within the battery pack, utilizing the direct contact between the insulating immersion liquid and the surface of the battery cells to achieve heat dissipation.

[0003] However, in some applications, the top area of ​​the battery cell generates significant heat, resulting in poor thermal management. Summary of the Invention

[0004] In view of this, this application provides a battery box assembly and a battery pack, which aims to improve the heat dissipation effect of the battery pack.

[0005] To achieve the above objectives, this application provides a battery box assembly and battery pack, which adopts the following technical solution:

[0006] In a first aspect, this application provides a battery box assembly, including:

[0007] Box frame;

[0008] A first cooling assembly is connected to the bottom of the housing frame;

[0009] A lid, which is connected to the top of the box frame;

[0010] A second cooling assembly is connected to the side of the box cover facing the first cooling assembly;

[0011] The housing frame, the first cooling component, and the housing cover together form a receiving cavity, which is used to house the battery cell module. The first cooling component and the second cooling component are used to dissipate heat at opposite ends of the battery cell module.

[0012] In one possible implementation, the battery box assembly provided in this application includes a box frame comprising a frame and a partition plate, wherein the partition plate is connected to the inner wall of the frame and the upper surface of the first cooling assembly;

[0013] The partition plate divides the receiving cavity into a cell cavity and an electrical cavity. The cell cavity is used to house the cell module, and the electrical cavity is used to house the battery management system.

[0014] In one possible implementation, the battery box assembly provided in this application has an immersion liquid injection port and an immersion liquid outlet on the frame.

[0015] Both the immersion liquid injection port and the immersion liquid outlet are connected to the cell cavity. The immersion liquid injection port is used to inject immersion liquid into the cell cavity, and the immersion liquid outlet is used to discharge the immersion liquid.

[0016] In one possible implementation, the battery box assembly provided in this application includes a first cooling assembly comprising a liquid cooling plate, the surface of which facing the box cover is a plane, the plane being used to abut against the battery cell module.

[0017] The liquid cooling plate is provided with a refrigerant channel for refrigerant flow, and the liquid cooling plate is provided with a refrigerant injection port and a refrigerant outlet that are connected to the refrigerant channel.

[0018] In one possible implementation, the battery box assembly provided in this application further includes at least one reinforcing beam in the first cooling assembly;

[0019] The reinforcing beam is connected to the liquid cooling plate, and the reinforcing beam is located on the side of the liquid cooling plate away from the box cover.

[0020] In one possible implementation, the battery box assembly provided in this application includes a second cooling assembly comprising an insulating frame and a cooling pipe;

[0021] The insulating frame is connected to the side of the box cover facing the first cooling assembly, and the cooling pipe is disposed on the insulating frame.

[0022] In one possible implementation, the battery box assembly provided in this application includes an insulating frame comprising a plurality of connecting seats and a plurality of support bars, wherein the connecting seats and the support bars are alternately connected in sequence.

[0023] The connecting seat is connected to the box cover, and the support strip is spaced apart from the box cover;

[0024] The cooling pipe is detachably connected to the support bar, and the cooling pipe is located between the support bar and the box cover.

[0025] In one possible implementation, the battery box assembly provided in this application has claws at both ends of the support bar, the claws being used to engage with the battery cell module.

[0026] In one possible implementation, the battery box assembly provided in this application further includes a maintenance panel in the box frame, the maintenance panel being detachably connected to the frame.

[0027] The frame has an inspection window that is connected to the electrical cavity, and the inspection panel is configured to open or close the inspection window.

[0028] Secondly, this application provides a battery pack, including a cell module and a battery box assembly as described above;

[0029] The battery cell module is disposed within the receiving cavity of the battery box assembly.

[0030] The battery box assembly and battery pack provided in this application include a box frame, a first cooling assembly, a box cover, and a second cooling assembly; the first cooling assembly is connected to the bottom of the box frame; the box cover is connected to the top of the box frame; the second cooling assembly is connected to the side of the box cover facing the first cooling assembly; the box frame, the first cooling assembly, and the box cover together form a receiving cavity, which is used to house the battery cell module, and the first cooling assembly and the second cooling assembly are respectively used to dissipate heat at opposite ends of the battery cell module.

[0031] By setting up a first cooling component to dissipate heat from the bottom of the cell module and a second cooling component to dissipate heat from the top of the cell module, a dual heat dissipation path is formed. This strengthens heat dissipation in the top area of ​​the cell module where heat generation is severe, improves the temperature uniformity of the cell module, reduces the overall temperature difference of the cell module, and thus improves the heat dissipation effect of the battery pack.

[0032] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the technical solutions provided by this application, other technical features contained in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific embodiments. Attached Figure Description

[0033] The specific embodiments of this application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of this application, and this application is not limited to the specific embodiments described below.

[0034] Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of this application;

[0035] Figure 2 This is a partial exploded structural diagram of the box frame provided in an embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the structure of the first cooling component provided in an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the structure of the second cooling component provided in an embodiment of this application;

[0038] Figure 5 for Figure 4 A magnified structural diagram of part A in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Receiving cavity; 11. Cell cavity; 12. Electrical cavity; 20. Cell module; 30. Battery management system; 100. Housing frame; 110. Frame; 111. Immersion liquid inlet; 112. Immersion liquid outlet; 113. Inspection window; 120. Divider plate; 130. Inspection panel; 140. Sealing gasket; 200. First cooling assembly; 210. Liquid cooling plate; 211. Refrigerant channel; 212. Refrigerant inlet; 213. Refrigerant outlet; 220. Reinforcing beam; 230. Sheet metal wall; 300. Housing cover; 400. Second cooling assembly; 410. Insulating frame; 411. Connecting seat; 412. Support bar; 413. Elastic buckle; 414. Claw; 420. Cooling pipe; 421. Coolant inlet; 422. Coolant outlet.

[0041] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the preferred embodiments of this application will be described in more detail below with reference to the accompanying drawings.

[0043] In the accompanying drawings, the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments in this application.

[0044] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application. The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0045] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication between 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.

[0046] In the description of the embodiments of this application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are 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.

[0047] In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise specified precisely.

[0048] The terms “first,” “second,” “third,” “fourth,” etc., used in the description of this application and in the above-mentioned figures are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0049] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0050] With the rapid development of the new energy vehicle and energy storage industries, high-energy-density, high-charge-discharge-rate lithium battery technology has become a core requirement. In the new energy vehicle sector, the thermal management performance of the battery pack directly affects the vehicle's range, battery life, and safety performance; in energy storage systems, the stability and heat dissipation efficiency of the battery pack are related to the grid regulation capability and the safety of large-scale energy storage. Traditional air-cooling and liquid-cooling technologies are insufficient to meet the rapid heat dissipation requirements of battery packs under high-power scenarios, especially under high-load conditions, where problems such as large local temperature differences and high risk of thermal runaway are becoming increasingly prominent.

[0051] To solve the heat dissipation problem, related technologies employ immersing the battery cells (also known as cell modules) of the battery pack in an insulating immersion liquid located within the battery pack, thereby achieving heat dissipation through direct contact between the insulating immersion liquid and the surface of the cell.

[0052] However, in some applications, the top area of ​​the battery cell experiences significant heat generation, resulting in poor thermal management. For example, while the insulating impregnation fluid covers the periphery of the battery cell module, the top of the module typically does not reach a deep depth due to the need for components such as terminals, aluminum busbars, and integrated busbar assemblies. In other words, the amount of impregnation fluid at the top of the battery cell module is less than that at the periphery. This leads to the inability to dissipate heat effectively and promptly at the top of the battery cell module, causing heat accumulation and resulting in a "top-heavy" phenomenon.

[0053] Furthermore, in other application scenarios, such as the immersion fluid immersing the battery cell modules and thermal management systems, high-voltage electrical components such as fuses and MSD (Material Safety Data, a safety data sheet system used to manage and control the power battery packs of new energy vehicles) are also immersed. These electrical components and sealing materials must undergo compatibility certification, and the immersion fluid must be drained before maintenance, and then refilled after the operation, significantly increasing maintenance and time costs.

[0054] Based on the above-mentioned technical problems, this application provides a battery box assembly and a battery pack. In this technical solution, the battery box assembly includes a box frame, a first cooling assembly, a box cover, and a second cooling assembly. The first cooling assembly is connected to the bottom of the box frame; the box cover is connected to the top of the box frame; the second cooling assembly is connected to the side of the box cover facing the first cooling assembly; the box frame, the first cooling assembly, and the box cover together form a receiving cavity, which is used to house the battery cell module. The first cooling assembly and the second cooling assembly are respectively used to dissipate heat at opposite ends of the battery cell module.

[0055] By setting up a first cooling component to dissipate heat from the bottom of the cell module and a second cooling component to dissipate heat from the top of the cell module, a dual heat dissipation path is formed. This strengthens heat dissipation in the top area of ​​the cell module where heat generation is severe, improves the temperature uniformity of the cell module, reduces the overall temperature difference of the cell module, and thus improves the heat dissipation effect of the battery pack.

[0056] It should be noted that, Figures 1 to 5 This diagram illustrates a simplified representation of the battery box assembly and its components. The specific structures of the remaining components in the battery box assembly and battery pack are not limited to these examples. Figures 1 to 5 of examples.

[0057] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0058] Reference Figure 1 As shown in the embodiment of this application, a battery box assembly is provided for a battery pack. The battery box assembly includes a box frame 100, a first cooling assembly 200, a box cover 300, and a second cooling assembly 400.

[0059] The first cooling assembly 200 is connected to the bottom of the housing frame 100; the cover 300 is connected to the top of the housing frame 100. It is understood that the battery pack has a top and a bottom, with the bottom of the battery pack typically facing the ground. The top and bottom of the battery box assembly correspond to the top and bottom of the battery pack. That is, since the first cooling assembly 200 is connected to the bottom of the housing frame 100, the first cooling assembly 200 is closer to the ground relative to the housing frame 100. The cover 300 is connected to the top of the housing frame 100, and the cover 300 is farther from the ground relative to the housing frame 100.

[0060] The second cooling component 400 is connected to the side of the cover 300 facing the first cooling component 200; or it can be understood as the second cooling component 400 being connected to the lower surface of the cover 300.

[0061] The housing frame 100, the first cooling component 200, and the housing cover 300 together form a receiving cavity 10. The receiving cavity 10 is used to house the battery cell module 20. The battery cell module 20 is installed in the receiving cavity 10. In this embodiment, the connection relationship between the battery cell module 20 and the battery box assembly is not specifically limited. It can be placed directly in the receiving cavity 10, or it can be welded to the battery box assembly or detachably connected.

[0062] The first cooling component 200 and the second cooling component 400 are used to dissipate heat at opposite ends of the battery cell module 20, respectively. Specifically, the first cooling component 200 dissipates heat at the bottom of the battery cell module 20, and the second cooling component 400 dissipates heat at the top of the battery cell module 20.

[0063] Traditional immersion cooling relies on natural convection of the immersion liquid. However, due to heat accumulation and a single heat dissipation path, the top of the battery module 20 is prone to localized high temperatures. In the above embodiment, the first cooling component 200 dissipates heat to the bottom of the battery module 20, which can be achieved by the first cooling component 200 contacting the bottom of the battery module 20; the second cooling component 400 dissipates heat to the top of the battery module 20, which can be achieved by the second cooling component 400 contacting the top of the battery module 20, forming a dual heat dissipation path. This enhances heat dissipation in the top area of ​​the battery module 20, which experiences severe heat generation, reduces the overall temperature difference of the battery module 20, and avoids the risk of localized thermal runaway.

[0064] Compared to the traditional immersion heat dissipation structure, the cooling method of adding dual-end heat dissipation can improve heat conduction efficiency, enhance the temperature uniformity of the battery cell module 20, and significantly improve heat dissipation efficiency.

[0065] In one possible implementation, both the first cooling component 200 and the second cooling component 400 are directly in contact with the battery cell module 20, resulting in a short heat dissipation path and low thermal resistance, which helps to improve heat dissipation efficiency. At the same time, the direct contact between the first cooling component 200 and the second cooling component 400 and the battery cell module 20 can improve structural stability.

[0066] In one possible implementation, the first cooling component 200 dissipates heat from the bottom of the battery module 20, which can be achieved by the first cooling component 200 dissipating heat from the immersion liquid at the bottom of the battery module 20, thereby dissipating heat from the battery module 20; the second cooling component 400 dissipates heat from the top of the battery module 20, which can be achieved by the second cooling component 400 dissipating heat from the immersion liquid at the top of the battery module 20, thereby dissipating heat from the top of the battery module 20. By accelerating the heat conduction of the immersion liquid, heat dissipation of the immersion liquid is achieved, thereby improving the heat dissipation of the battery module 20.

[0067] The housing frame 100, the first cooling component 200, and the housing cover 300 form a receiving cavity 10, which is further enclosed. This design is suitable for scenarios where the immersion liquid is filled. The enclosed receiving cavity 10 prevents leakage of the immersion liquid while ensuring sufficient contact between the immersion liquid and the surface of the battery cell. By incorporating the immersion liquid, combined with the first cooling component 200 and the second cooling component 400, multiple heat dissipation methods are achieved for the battery cell module 20, enhancing the dual heat dissipation effect and further improving heat dissipation efficiency.

[0068] In one possible implementation, refer to Figure 1 and Figure 2 As shown, the housing frame 100 includes a frame 110 and a partition plate 120, the partition plate 120 being connected to the inner wall of the frame 110 and the upper surface of the first cooling assembly 200.

[0069] The separator 120 divides the receiving cavity 10 into a cell cavity 11 and an electrical cavity 12. The cell cavity 11 is used to house the cell module 20, and the electrical cavity 12 is used to house the battery management system 30. Specifically, the separator 120 is welded to the two inner walls opposite to the frame 110, and the bottom edge of the separator 120 is welded to the upper surface of the first cooling assembly 200. This embodiment does not limit the material of the separator 120; the welding method helps improve sealing and prevent leakage.

[0070] The partition plate 120 is connected to both the inner wall of the frame 110 and the upper surface of the first cooling assembly 200, effectively adding a longitudinal support structure inside the receiving cavity 10. This helps to disperse external impact forces or vibration loads during vehicle operation on the frame 100, thereby improving the overall structural strength of the battery pack assembly.

[0071] In traditional technology, the battery pack housing needs to contain a large amount of insulating immersion fluid, which leads to a significant increase in internal pressure and places extremely high demands on the sealing performance of the welds, making it prone to leakage.

[0072] In the above embodiments, by setting a partition plate 120, the receiving cavity 10 is divided into a cell cavity 11 and an electrical cavity 12. Compared with the traditional setting method, only the cell cavity 11 is injected with insulating impregnation liquid, which can reduce the amount of insulating impregnation liquid used, thereby reducing the pressure in the cell cavity 11 and avoiding leakage. It should be noted that the embodiments of this application do not limit the type or material of the insulating impregnation liquid.

[0073] Furthermore, the separator 120 physically cuts off the direct heat conduction path from the cell cavity 11 to the electrical cavity 12, preventing the battery management system 30 from experiencing performance degradation or malfunction due to prolonged exposure to high temperatures, thus ensuring the stable operation of the battery management system 30. Simultaneously, physical isolation prevents electrolyte leakage and current leakage in the cell cavity 11 from affecting the components within the electrical cavity 12, reducing the risks of short circuits and signal interference, and significantly improving the overall safety level of the battery pack.

[0074] In one specific implementation, continue to refer to Figure 2 As shown, the frame 110 is provided with an immersion liquid injection port 111 and an immersion liquid outlet 112; both the immersion liquid injection port 111 and the immersion liquid outlet 112 are connected to the cell cavity 11. Specifically, both the immersion liquid injection port 111 and the immersion liquid outlet 112 are connected to the cell cavity 11 through pipes.

[0075] The immersion fluid injection port 111 is used to inject immersion fluid into the cell cavity 11, and the immersion fluid outlet 112 is used to discharge the immersion fluid. In one embodiment, low-temperature immersion fluid is injected into the cell cavity 11 through the immersion fluid injection port 111, and high-temperature immersion fluid is discharged through the immersion fluid outlet 112, thereby achieving active circulation of the immersion fluid within the cell cavity 11. The flowing immersion fluid can quickly remove heat from the surface of the cell module 20, improving heat dissipation efficiency and temperature uniformity.

[0076] Furthermore, the immersion liquid injection port 111 and the immersion liquid outlet 112 are located on the same side of the frame 110 for easy subsequent maintenance.

[0077] In one possible implementation, the immersion liquid inlet 111 is located above the immersion liquid outlet 112 in the height direction of the battery pack, so that the immersion liquid can fully fill the cell cavity 11.

[0078] In one possible implementation, the first cooling assembly 200 includes a liquid cooling plate 210. The surface of the liquid cooling plate 210 facing the cover 300 is flat and is used to abut against the battery cell module 20. The planar design of the surface of the liquid cooling plate 210 facing the battery cell module 20 allows for a larger contact area with the battery cell module 20 compared to non-planar cooling components, reducing contact thermal resistance and ensuring that heat from the battery cell module 20 can be quickly conducted to the liquid cooling plate 210, thus improving heat dissipation efficiency.

[0079] The liquid cooling plate 210 is a blow-inflated, one-piece liquid cooling plate 210. The liquid cooling plate 210 has a refrigerant channel 211 for refrigerant flow, and a refrigerant injection port 212 and a refrigerant outlet 213 communicating with the refrigerant channel 211. This allows for active circulation of the refrigerant within the liquid cooling plate 210. When the low-temperature refrigerant flows through the refrigerant channel 211, it quickly removes the heat absorbed by the battery module 20 by the liquid cooling plate 210 through heat exchange. The high-temperature refrigerant is discharged, cooled externally, and then flows back. (Refer to...) Figure 3 As shown, the embodiments of this application do not restrict the positional distribution of the refrigerant injection port 212 and the refrigerant outlet 213.

[0080] Furthermore, the refrigerant circulation flow rate can be dynamically adjusted according to the real-time heat generation power of the battery module 20: under low load conditions, the refrigerant flow rate is reduced to save energy; under high load conditions, the flow rate is increased to enhance heat dissipation.

[0081] In one possible implementation, refer to Figure 3 As shown, there are 4 refrigerant channels 211, which are connected in sequence and arranged at intervals.

[0082] In one possible implementation, refer to Figure 3 As shown, the first cooling assembly 200 also includes at least one reinforcing beam 220. The reinforcing beam 220 is connected to the liquid cooling plate 210, and the reinforcing beam 220 is located on the side of the liquid cooling plate 210 away from the cover 300.

[0083] In practice, sheet metal walls 230 are provided on both sides of the liquid cooling plate 210, and the liquid cooling plate 210 and the sheet metal walls 230 are formed by laser welding. The reinforcing beam 220 is connected to the liquid cooling plate 210 through the sheet metal walls 230. The structural strength of the liquid cooling plate 210 is relatively low. By setting the sheet metal walls 230, a connection foundation is provided for the reinforcing beam 220. Without compromising the structural strength of the liquid cooling plate 210, the structural strength of the liquid cooling plate 210 can be improved by the reinforcing beam 220.

[0084] There are multiple sets of strengthening beams 220, for example Figure 3 As shown, four reinforcing beams 220 are provided, and the four reinforcing beams 220 are arranged at intervals along the length or width direction of the liquid cooling plate 210. Structural ribs are provided on the reinforcing beams 220 to improve their bending resistance. In another embodiment, the extension direction of the refrigerant channel 211 is perpendicular to the extension direction of the reinforcing beams 220, further improving the structural strength.

[0085] In the above embodiment, the reinforcing beam 220 is connected to the liquid cooling plate 210 and located on the side away from the cover 300. This means that the reinforcing beam 220 provides a longitudinal support frame for the liquid cooling plate 210, which can significantly improve the overall structural rigidity and deformation resistance of the liquid cooling plate 210, prevent the liquid cooling plate 210 from deforming due to external or internal forces, ensure its large-area contact with the battery cell module 20, and maintain the stability of heat dissipation efficiency.

[0086] The refrigerant channel 211 inside the liquid cooling plate 210 is the core structure for liquid cooling. If there is localized stress concentration in the liquid cooling plate 210, it can easily lead to the rupture of the refrigerant channel 211 and refrigerant leakage. This will not only result in the loss of heat dissipation function but may also cause a short circuit risk inside the battery pack. The reinforcing beam 220 can disperse the impact force and vibration force on the liquid cooling plate 210, avoid stress concentration in the area corresponding to the refrigerant channel 211, reduce the probability of damage and refrigerant leakage, and improve the operational safety of the first cooling component 200 and the entire battery pack.

[0087] The reinforcing beam 220 is installed on the side of the liquid cooling plate 210 away from the cover 300, and the plane of the liquid cooling plate 210 facing the cover 300 is the contact and heat dissipation surface with the battery cell module 20. This arrangement does not occupy heat dissipation contact space, does not change the planar contact shape of the liquid cooling plate 210, and does not affect the heat conduction path between the liquid cooling plate 210 and the battery cell module 20.

[0088] In one possible implementation, refer to Figure 1 , Figure 4 and Figure 5 As shown, the second cooling assembly 400 includes an insulating frame 410 and a cooling pipe 420; the insulating frame 410 is connected to the side of the cover 300 facing the first cooling assembly 200, and the cooling pipe 420 is disposed on the insulating frame 410.

[0089] In the above embodiment, the insulating frame 410 serves as the mounting carrier for the cooling pipe 420, and its core characteristic is insulation. The insulating frame 410 can be made of plastic or other insulating materials. The insulating frame 410 can electrically isolate the cooling pipe 420 from the box cover 300 and the cell module 20, preventing short circuit faults caused by conductive materials or surface condensation in the cooling pipe 420, thus ensuring the electrical safety and reliability of the battery pack from a structural perspective. The insulating frame 410 is rigidly connected to the box cover 300, and the cooling pipe 420 is fixed on the insulating frame 410, forming a stable mounting structure.

[0090] Specifically, the insulating frame 410 includes multiple connecting seats 411 and multiple support bars 412, with the connecting seats 411 and support bars 412 connected alternately in sequence. Furthermore, multiple insulating frames 410 can be configured, with multiple insulating frames 410 jointly supporting the cooling pipe 420, which can further improve the installation stability of the cooling pipe 420. Both the connecting seats 411 and the support bars 412 are made of insulating material.

[0091] The connecting seat 411 is connected to the box cover 300, and the support bar 412 is spaced apart from the box cover 300. It can be understood that the connecting seat 411 has a certain height or thickness. One end of the connecting seat 411 is connected to the box cover 300, and the other end of the connecting seat 411 is connected to the support bar 412, so that the support bar 412 is spaced apart from the box cover 300.

[0092] The cooling pipe 420 is detachably connected to the support bar 412, and the cooling pipe 420 is located between the support bar 412 and the cover 300. In this way, the cooling pipe 420 does not need to contact the battery cell module 20, but only cools the immersion liquid. Specifically, one end of the cooling pipe 420 has a coolant inlet 421, and the other end has a coolant outlet 422. The cooling pipe 420 circulates coolant through the coolant inlet 421 and the coolant outlet 422 to dissipate heat from the immersion liquid above the battery cell module 20.

[0093] In the above embodiment, the cooling pipe 420 can be detachably connected to the side of the support bar 412 away from the battery cell module 20. For example, the support bar 412 is provided with an elastic buckle 413, and the cooling pipe 420 is locked in the elastic buckle 413. In order to improve the connection stability, the number of elastic buckles 413 can also be set to multiple.

[0094] In one possible implementation, the cooling pipe 420 is arranged in a serpentine pattern, which increases the contact area between the cooling pipe 420 and the immersion liquid, thereby improving heat dissipation efficiency. The insulating frame 410 can also be connected to the top of the housing frame 100, which can further improve stability and facilitate assembly.

[0095] The support bar 412 has claws 414 at both ends, which are used to engage with the cell module 20. The top of the cell module 20 has a slot, in which the claws 414 engage. By setting the slot and claws 414, it is convenient to achieve assembly positioning and facilitate assembly, and it also helps to further improve the installation stability of the insulation frame 410.

[0096] In one possible implementation, refer to Figure 2 As shown, the housing frame 100 also includes a maintenance panel 130, which is detachably connected to the frame 110. The maintenance panel 130 can be detachably connected to the outer wall of the frame 110 via bolts. The frame 110 has a maintenance window 113, which communicates with the electrical cavity 12. The maintenance panel 130 is configured to open or close the maintenance window 113. To improve the battery pack's sealing performance, a sealing gasket 140 is provided between the maintenance panel 130 and the frame 110. The sealing gasket 140 surrounds the periphery of the maintenance window 113.

[0097] In the above embodiment, by opening a maintenance window 113 communicating with the electrical cavity 12 in the frame 110 and configuring a detachable maintenance panel 130, it is not necessary to disassemble the entire cover 300 or the frame 100. Only the maintenance panel 130 needs to be opened to operate the wiring connectors and other components of the battery management system 30 inside the electrical cavity 12, which greatly simplifies the maintenance process and reduces the time and labor costs required for maintenance.

[0098] In one possible implementation, the inspection window 113, the immersion fluid inlet 111, and the immersion fluid outlet 112 are all located on the same side of the frame 110, facilitating maintenance and piping installation. Furthermore, the refrigerant inlet 212, the refrigerant outlet 213, the coolant inlet 421, and the coolant outlet 422 are all located on the same side of the frame 110.

[0099] In one possible implementation, this application provides a battery pack including a cell module 20 and the aforementioned battery box assembly. The battery box assembly has a receiving cavity 10, and the cell module 20 is disposed within the receiving cavity 10. The battery box assembly has already been described above and will not be repeated here.

[0100] The battery pack in the embodiments of this application can be used in new energy vehicles, and the new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The embodiments of this application do not limit the specific structure of the vehicle.

[0101] The vehicles mentioned in this application embodiment can also refer to large cars, small cars, special-purpose vehicles, etc. For example, according to vehicle type, the vehicles in this application embodiment can be sedans, off-road vehicles, multi-purpose vehicles (MPVs), or other types of vehicles. Of course, they can also be other types of vehicles, and this application embodiment does not limit them.

[0102] The implementation principle of a battery box assembly and battery pack according to an embodiment of this application is as follows: The battery box assembly includes a box frame 100, a first cooling component 200, a box cover 300, and a second cooling component 400; the first cooling component 200 is connected to the bottom of the box frame 100; the box cover 300 is connected to the top of the box frame 100; the second cooling component 400 is connected to the side of the box cover 300 facing the first cooling component 200; the box frame 100, the first cooling component 200, and the box cover 300 together form a receiving cavity 10, which is used to house the battery cell module 20, and the first cooling component 200 and the second cooling component 400 are respectively used to dissipate heat at opposite ends of the battery cell module 20.

[0103] By setting the first cooling component 200 to dissipate heat from the bottom of the cell module 20 and the second cooling component 400 to dissipate heat from the top of the cell module 20, a dual heat dissipation path is formed, which strengthens heat dissipation in the top area of ​​the cell module 20 where heat generation is severe, improves the temperature uniformity of the cell module 20, reduces the overall temperature difference of the cell module 20, and thus improves the heat dissipation effect of the battery pack.

[0104] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein.

[0105] The embodiments in this application are intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed in this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the claims.

[0106] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery box assembly, characterized in that, include: Box frame (100); A first cooling assembly (200) is connected to the bottom of the housing frame (100); A lid (300) is connected to the top of the box frame (100); The second cooling assembly (400) is connected to the side of the lid (300) facing the first cooling assembly (200); The housing frame (100), the first cooling component (200) and the housing cover (300) together form a receiving cavity (10), which is used to house the battery cell module (20). The first cooling component (200) and the second cooling component (400) are used to dissipate heat at opposite ends of the battery cell module (20).

2. The battery box assembly according to claim 1, characterized in that, The housing frame (100) includes a frame (110) and a partition plate (120), the partition plate (120) being connected to the inner wall of the frame (110) and the upper surface of the first cooling assembly (200); The partition plate (120) divides the receiving cavity (10) into a cell cavity (11) and an electrical cavity (12). The cell cavity (11) is used to house the cell module (20), and the electrical cavity (12) is used to house the battery management system (30).

3. The battery box assembly according to claim 2, characterized in that, The frame (110) is provided with an immersion liquid injection port (111) and an immersion liquid outlet (112). The immersion liquid injection port (111) and the immersion liquid outlet (112) are both connected to the cell cavity (11). The immersion liquid injection port (111) is used to inject immersion liquid into the cell cavity (11), and the immersion liquid outlet (112) is used to discharge immersion liquid.

4. The battery box assembly according to any one of claims 1 to 3, characterized in that, The first cooling assembly (200) includes a liquid cooling plate (210), the surface of which facing the cover (300) is flat and is used to abut against the battery cell module (20); The liquid cooling plate (210) is provided with a refrigerant channel (211) for refrigerant flow, and the liquid cooling plate (210) is provided with a refrigerant injection port (212) and a refrigerant outlet (213) communicating with the refrigerant channel (211).

5. The battery box assembly according to claim 4, characterized in that, The first cooling assembly (200) also includes at least one reinforcing beam (220); The reinforcing beam (220) is connected to the liquid cooling plate (210), and the reinforcing beam (220) is located on the side of the liquid cooling plate (210) away from the box cover (300).

6. The battery box assembly according to any one of claims 1 to 3, characterized in that, The second cooling assembly (400) includes an insulating frame (410) and a cooling pipe (420). The insulating frame (410) is connected to the box cover (300) on the side facing the first cooling assembly (200), and the cooling pipe (420) is disposed on the insulating frame (410).

7. The battery box assembly according to claim 6, characterized in that, The insulating frame (410) includes multiple connecting seats (411) and multiple support bars (412), and the connecting seats (411) and the support bars (412) are connected alternately in sequence; The connecting seat (411) is connected to the box cover (300), and the support strip (412) is spaced apart from the box cover (300); The cooling pipe (420) is detachably connected to the support bar (412), and the cooling pipe (420) is located between the support bar (412) and the box cover (300).

8. The battery box assembly according to claim 7, characterized in that, The support bar (412) is provided with claws (414) at both ends, and the claws (414) are used to lock onto the battery cell module (20).

9. The battery box assembly according to claim 2, characterized in that, The housing frame (100) also includes a maintenance panel (130), which is detachably connected to the housing (110); The frame (110) has an inspection window (113) which is connected to the electrical cavity (12). The inspection panel (130) is configured to open or close the inspection window (113).

10. A battery pack, characterized in that, Includes a cell module (20) and a battery box assembly as described in any one of claims 1 to 9; The cell module (20) is disposed within the receiving cavity (10) of the battery box assembly.

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