Battery pack upper cover, battery pack housing, battery pack assembly, and vehicle

Abstract

This invention relates to the field of vehicle technology and discloses a battery pack cover, a battery pack housing, a battery pack assembly, and a vehicle. The battery pack cover includes a cover plate body and a heat-conducting component. The cover plate body includes a main body and a protruding structure connected to the main body. Along the thickness direction of the cover plate body, the protruding structure is located on one side of the main body. The heat-conducting component is connected to the protruding structure, and a cooling channel is formed between the heat-conducting component, the protruding structure, and the main body. The heat-conducting component is used to contact the battery cells of the battery pack assembly to fix the battery cells. Applying the technical solution of this invention can solve the problem of low system integration caused by the separate design of the cover plate and the heat dissipation component in the prior art.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, specifically to a battery pack cover, a battery pack housing, a battery pack assembly, and a vehicle. Background Technology

[0002] With the accelerated development of the global new energy vehicle industry, the power battery pack, as the core energy carrier of vehicles, has seen its safety, structural reliability, lightweighting level, and thermal management efficiency become key indicators determining overall vehicle performance and user safety. The industry is placing higher demands on the comprehensive performance of battery systems under complex operating conditions, urgently requiring structural innovation to achieve synergistic optimization of safety, cost, and efficiency.

[0003] Current mainstream battery packs use an independent metal cover to cover the battery cells, with a grooved structure at the bottom of the cover to mechanically hold the cells in place. Heat dissipation relies on an additional liquid cooling plate or air cooling assembly, which conducts heat away from the cells through external piping in contact with the cell surface. The cover and the heat dissipation system are completely separate in structure and function, each responsible for its own function of holding and protecting the cells while also handling heat exchange.

[0004] The design of separating the cover plate from the heat dissipation components results in low system integration, a large number of parts, and complex assembly, making it difficult to meet the development needs of high integration and lightweight battery packs. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a battery pack cover, a battery pack housing, a battery pack assembly, and a vehicle, which aims to solve the problem of low system integration caused by the design of separating the cover plate and the heat dissipation components in the prior art.

[0006] In a first aspect, embodiments of this application provide a battery pack cover for a battery pack assembly. The battery pack cover includes a cover body and a heat-conducting component. The cover body includes a main body and a protruding structure connected to the main body. Along the thickness direction of the cover body, the protruding structure is disposed on one side of the main body. The heat-conducting component is connected to the protruding structure, and a cooling channel is formed between the heat-conducting component, the protruding structure, and the main body. The heat-conducting component is used to contact the battery cells of the battery pack assembly to fix the battery cells.

[0007] Based on the aforementioned technical features, the battery pack cover provided in this application, while limiting and fixing the battery cells through the protruding structure and heat-conducting components, also dissipates heat from the battery pack assembly through heat exchange between the heat-conducting components and the battery cells, as well as heat exchange between the heat-conducting components and the coolant within the cooling channels, within the main body, the protruding structure, and the cooling plate. This allows the protruding structure and heat-conducting components to both limit and cool the battery cells, integrating cell cooling and limiting into a single unit, thus increasing the overall integration of the battery pack.

[0008] In some embodiments, the density of the cover plate body is less than the density of the heat-conducting element; and / or, the thermal conductivity of the heat-conducting element is greater than the thermal conductivity of the cover plate body.

[0009] Based on the aforementioned technical features, the volume of the cover plate body is much larger than that of the heat-conducting component. Using a lower-density material for the larger cover plate body allows for a smaller mass, thereby reducing the overall size of the battery pack cover. This enables the battery pack assembly to meet both integration and lightweight requirements. Furthermore, using a material with a high thermal conductivity for the heat-conducting component improves the heat exchange efficiency between the component and the battery cells, as well as the uniformity of heat distribution. It also increases the heat exchange efficiency between the heat-conducting component and the coolant in the cooling channels, thus enhancing the heat dissipation effect on the battery cells.

[0010] In some embodiments, the material of the cover body includes a composite material, and the material of the heat-conducting component includes an aluminum alloy.

[0011] Based on the aforementioned technical characteristics, composite materials possess high strength and excellent corrosion resistance, good electrical insulation, and flame retardant properties, effectively enhancing the safety protection capabilities of the battery pack assembly. Simultaneously, their low density significantly reduces the overall vehicle weight. Aluminum alloys, compared to other materials with good thermal conductivity, have low density and are lightweight, contributing to lightweight design while ensuring good heat dissipation performance.

[0012] In some embodiments, the heat-conducting component includes a heat-spreading portion and a heat-conducting protrusion. The heat-spreading portion is located on the side of the protrusion structure away from the main body and is connected to the protrusion structure. The heat-spreading portion is used to contact the battery cell to fix the battery cell. The heat-conducting protrusion is connected between the heat-spreading portion and the main body. The heat-conducting protrusion, the protrusion structure, the heat-spreading portion and the main body form a first flow channel. A second flow channel is provided inside the heat-conducting protrusion. The cooling flow channel includes the first flow channel and the second flow channel.

[0013] Based on the above technical features, the coolant in the first flow channel can flow through the heat-conducting protrusions and the heat-spreading section, which can increase the contact area for heat exchange between the heat-conducting component and the coolant in the first flow channel, thereby increasing the heat dissipation efficiency of the coolant on the heat-conducting component, so that the heat-conducting component has a better heat dissipation effect on the battery cell.

[0014] The second flow channel further increases the contact area between the heat-conducting protrusions and the coolant, thereby increasing the heat dissipation efficiency of the protrusions and improving their heat dissipation effect on the heat dissipation zone, thus enhancing the heat dissipation capacity of the heat-conducting components for the battery cell. Simultaneously, it ensures sufficient coolant flow within the cooling channel.

[0015] In some embodiments, the protrusion structure includes a first protrusion and a second protrusion spaced apart along a first direction, the first direction being perpendicular to the thickness direction of the cover plate body; the first protrusion and the second protrusion are both connected between the heat-spreading portion and the main body portion, a heat-conducting protrusion is located between the first protrusion and the second protrusion, the heat-conducting protrusion, the first protrusion, the heat-spreading portion and the main body portion form a first sub-channel, the heat-conducting protrusion, the second protrusion, the heat-spreading portion and the main body portion form a second sub-channel, and the first sub-channel and the second sub-channel form the first channel.

[0016] According to the above technical features, the coolant flows in the first sub-channel and the second sub-channel so that the coolant contacts the heat-conducting protrusion on both sides of the heat-conducting protrusion along the first direction, which further increases the contact area between the heat-conducting protrusion and the coolant, thereby increasing the heat dissipation effect of the coolant on the heat-conducting protrusion, so as to increase the heat dissipation effect of the heat-conducting component on the battery cell.

[0017] In some embodiments, along the direction from the main body to the heat spreader, the first protrusion and the second protrusion gradually approach each other; and / or, along the first direction, the two surfaces of the heat-conducting protrusion are respectively the first surface and the second surface, and along the direction from the main body to the heat spreader, the first surface and the second surface gradually move away from each other; and / or, there are multiple heat-conducting protrusions, which are spaced apart along the first direction, and two adjacent heat-conducting protrusions, the heat spreader, and the main body form a third flow channel, and the cooling flow channel includes the third flow channel.

[0018] Based on the aforementioned technical features, the inner walls of the two opposing flow channels along the first direction are inclined surfaces. These inclined inner walls help reduce flow resistance, improve fluid distribution uniformity, and lower pressure drop, thereby enhancing the energy efficiency of the cooling system. Furthermore, they enhance the mechanical strength and deformation resistance of the first flow channel, improving overall structural reliability while ensuring lightweight design, thus increasing the overall structural stability of the battery pack cover.

[0019] Based on the aforementioned technical features, the structural strength of the heat-conducting protrusions can be effectively increased. These protrusions further enhance the structural strength and deformation resistance of the first flow channel, thereby more effectively increasing its overall strength. Simultaneously, they also increase the contact area between the coolant and the heat-conducting protrusions, thereby increasing the heat dissipation efficiency of the coolant.

[0020] Furthermore, the number of heat-conducting protrusions is set to be multiple, which can further increase the contact area between the heat-conducting component and the coolant, thereby increasing the heat exchange efficiency between the heat-conducting protrusions and the heat-spreading part, so as to improve the heat dissipation efficiency of the heat-conducting component for the battery cell.

[0021] In some embodiments, the cooling channel includes a first cooling channel, a second cooling channel, and a third cooling channel arranged sequentially at intervals along a first direction. Each of the first, second, and third cooling channels includes a first channel and a second channel. The inlet of the first cooling channel and the inlet of the third cooling channel are both used to receive external coolant. The outlet of the first cooling channel and the outlet of the third cooling channel are both connected to the inlet of the second cooling channel. The outlet of the second cooling channel is used to discharge coolant.

[0022] Based on the above technical features, if the total amount of coolant entering the second cooling channel increases without changing the coolant flow size, the flow rate of the coolant in the second channel will increase. The increased flow rate can improve the heat dissipation efficiency of the coolant on the heat-conducting components surrounding the second cooling channel, thereby making the heat dissipation effects of the first, second, and third cooling channels similar.

[0023] In some embodiments, the main body is provided with a groove, which is recessed from the side surface of the main body facing away from the protruding structure toward the protruding structure, and a reinforcing structure is provided in the groove.

[0024] Based on the aforementioned technical features, the groove structure can increase the structural strength of the main body, thereby increasing the protection capability of the cover plate body for the battery cells and enhancing the structural stability of the battery pack. The reinforcing structure located inside the groove can further increase the structural strength of the cover plate body. Simultaneously, the reinforcing structure can be concealed within the groove, thus preventing protrusions on the surface of the cover plate body away from the heat-conducting components from interfering with other vehicle parts.

[0025] In some embodiments, the projection of the groove onto the first plane coincides at least partially with the projection of the protrusion structure onto the first plane, the first plane being perpendicular to the thickness direction of the cover body; and / or, the reinforcing structure includes a plurality of reinforcing ribs, the plurality of reinforcing ribs being spaced apart along a second direction, two adjacent reinforcing ribs being inclined relative to each other, the second direction being perpendicular to the thickness direction of the cover body.

[0026] Based on the aforementioned technical features, the strength of the cover plate body can be further increased, thereby enhancing the structural stability of the battery pack assembly. Furthermore, it effectively improves the overall stiffness and deformation resistance of the cover plate body. The inclined stiffeners can form a truss-like or cross-bracing effect, which not only enhances the structure's load-bearing capacity under multi-directional loads but also more evenly distributes stress and suppresses local buckling. Simultaneously, this layout optimizes material distribution without significantly increasing weight, balancing lightweight and high-strength requirements.

[0027] Secondly, this application provides a battery pack housing, including the battery pack cover provided in the first aspect of this application.

[0028] Thirdly, this application provides a battery pack assembly, including the battery pack housing provided in the second aspect of this application.

[0029] Fourthly, this application provides a vehicle including the battery pack assembly provided in the third aspect of this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0031] Figure 1 This is a schematic diagram of the structure of the battery pack cover disclosed in the embodiments of this application; Figure 2 This is a schematic diagram showing the arrangement of the first cooling channel, the second cooling channel, and the third cooling channel disclosed in the embodiments of this application; Figure 3 This is a schematic diagram of the arrangement of the grooves and reinforcing ribs disclosed in the embodiments of this application.

[0032] Explanation of reference numerals in the attached figures: 10. Cover plate body; 11. Main body; 12. Protruding structure; 121. First protrusion; 122. Second protrusion; 13. Reinforcing rib; 20. Thermal conductive component; 21. Heat dissipation zone; 22. Thermal conductive protrusion; 30. Battery cells; A, Cooling channel; Aa, First cooling channel; Ab, Second cooling channel; Ac, Third cooling channel; A1, First channel; A11, First sub-channel; A12, Second sub-channel; A2, Second channel; A3, Third channel; B. Groove; C. First direction; D. Second direction; E. Connecting channel. Detailed Implementation

[0033] The terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Directional terms used in this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," are merely for reference to the orientation shown in the accompanying drawings. The use of directional terms is for better and clearer explanation and understanding of this application, and does not indicate the orientation of the referred device or component in an actual application scenario.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after connection. "Rotary connection" refers to a connection where the two parts can rotate relative to each other after connection. "Sliding connection" refers to a connection where the two parts can slide relative to each other after connection.

[0035] In the embodiments of this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0036] The terms "parallel" and "perpendicular" are relative to the current technological level, not absolute mathematical definitions. Slight deviations are permissible; approximations of parallelism or perpendicularity are acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, with the angle between them ranging from 0 to 5 degrees. Similarly, "A and B are perpendicular" means that A and B are perpendicular or approximately perpendicular, with the angle between them ranging from 85 to 95 degrees.

[0037] The term "electrical connection" refers to the flow of current or signal from one conductor to another. An electrical connection between A and B means that current or signal can flow from A to B and vice versa. This connection includes direct and indirect electrical connections. A direct electrical connection between A and B means that A and B are physically connected. An indirect electrical connection between A and B means that A and B are connected via C, where C can be at least one wire or device.

[0038] The embodiments of this application are described below with reference to the accompanying drawings.

[0039] This application provides a vehicle, which can be a passenger vehicle or a freight vehicle, and can also be an electric vehicle or a hybrid vehicle. This application does not limit the specific purpose or power type of the vehicle, and the choice can be made according to actual needs.

[0040] In some embodiments, the vehicle may include a battery pack assembly, the main function of which is to provide electrical energy to the vehicle's motor, electronic control system, and other on-board electrical equipment. The battery pack assembly is capable of receiving electrical energy from external discharge devices and storing the electrical energy. This application does not limit the specific structure of the battery pack assembly, which can be selected according to actual needs such as design and manufacturing processes.

[0041] In some possible embodiments, the battery pack assembly can serve as the central body of the vehicle body structure, connecting to both the front and rear bodies along the length of the vehicle. This allows the battery pack assembly to support other components within the vehicle while also absorbing stress during a collision.

[0042] like Figure 1 As shown, in some embodiments, the battery pack assembly may include battery cells 30 and a battery pack housing. The main function of the battery cells 30 is to store or release electrical energy, and multiple battery cells 30 may be arranged inside the battery pack housing. The main function of the battery pack housing is to support and protect the battery cells 30. The battery pack housing may also be used to support components inside the passenger compartment, such as seats, armrests, and dashboards.

[0043] In some embodiments, the battery pack assembly may include a battery pack top cover, a battery pack bottom plate, and a battery pack frame. The battery pack top cover may be connected above the battery pack frame along the vehicle height direction, and the battery pack bottom plate may be connected below the battery pack frame along the vehicle height direction, so that the battery pack top cover, the battery pack bottom plate, and the battery pack frame form a sealed accommodating space for accommodating the battery cell 30.

[0044] like Figure 1 As shown, in some embodiments, the battery pack cover includes a cover body 10 and a heat-conducting element 20. The cover body 10 includes a main body 11 and a protruding structure 12 connected to the main body 11. In some possible embodiments, the main body 11 may be a plate-shaped body that covers the battery pack frame along its height and forms a sealed accommodating space with the battery pack frame and the battery pack bottom plate.

[0045] For example, the protrusion and the main body 11 can be integrally formed, or the protrusion and the main body 11 can be connected by welding. This application does not limit the specific connection method between the protrusion and the main body 11, and can be selected according to actual conditions such as cost and design.

[0046] Along the thickness direction of the cover body 10, a protruding structure 12 is provided on one side of the main body 11, and a heat-conducting element 20 is connected to the protruding structure 12. In some possible embodiments, the protruding part and the heat-conducting element 20 can both be located within the accommodating space, that is, the heat-conducting element 20 and the protruding part can be located on the side of the main body 11 near the bottom plate of the battery pack.

[0047] A cooling channel A is formed between the heat-conducting element 20, the raised structure 12, and the main body 11. In some possible embodiments, the raised structure 12 may be connected between the heat-conducting element 20 and the main body 11, and the main body 11, the raised structure 12, and the main body 11 are arranged along the height direction of the vehicle. In other possible embodiments, the raised structure 12 is connected to the main body 11, a portion of the heat-conducting element 20 may be located on the side of the raised structure 12 away from the cover plate, and other portions of the heat-conducting element 20 may be located on the side of the raised portion along the length and / or width direction of the vehicle. This application does not limit the specific connection position between the heat-conducting element 20, the main body 11, and the raised structure 12, and the position can be selected according to the actual situation such as design and process.

[0048] For example, the heat-conducting component 20 and the raised structure 12 can be bonded together with adhesive, or the heat-conducting component 20 and the raised structure 12 can be connected with screws. This application does not limit the specific connection method between the heat-conducting component 20 and the raised structure 12, and the method can be selected according to actual conditions such as cost and process.

[0049] The heat-conducting component 20 is used to contact the battery cell 30 of the battery pack assembly to fix the battery cell 30. When the main body 11 covers the battery pack frame, both the protruding structure 12 and the heat-conducting component 20 are located within the accommodating space. The main body 11 is connected to the battery pack frame so that the main body 11 applies force to the heat-conducting component 20 through the protruding structure 12, so that the heat-conducting component 20 abuts against the battery cell 30, and applies force to the battery cell 30, and clamps the battery cell 30 in conjunction with the battery pack bottom plate.

[0050] This design ensures that the battery cell 30 maintains structural stability and tight contact under conditions such as vibration, impact, or thermal expansion and contraction, preventing displacement of the battery cell 30. This improves the overall safety of the battery pack assembly. Simultaneously, the coolant flowing through the cooling channel A formed by the heat-conducting component 20, the raised structure 12, and the main body 11 can exchange heat with the battery cell 30 through the heat-conducting component 20, thereby achieving heat dissipation for the battery cell 30.

[0051] The battery pack cover provided in this application, while limiting and fixing the battery cell 30 through the protruding structure 12 and the heat-conducting element 20, also dissipates heat from the battery pack assembly by means of heat exchange between the main body 11, the protruding structure 12, and the cooling channel A enclosed by the cooling plate, through heat exchange between the heat-conducting element 20 and the battery cell 30, and between the heat-conducting element 20 and the coolant in the cooling channel A. This allows the protruding structure 12 and the heat-conducting element 20 to both limit and cool the battery cell 30, integrating cooling and limiting of the battery cell into one unit, thus increasing the integration of the battery pack.

[0052] In some embodiments, the density of the cover body 10 is less than that of the heat conductor 20. That is, compared with the heat conductor 20 of the same size, the cover body 10 is lighter. The cover body 10 is the main part of the battery cover, and it is a plate-like structure that forms an accommodating space together with the battery pack bottom plate and the battery pack frame. The volume of the cover body 10 is much larger than that of the heat conductor 20. The larger volume of the cover body 10 can achieve a smaller weight by using a material with a lower density, thereby reducing the overall size of the battery pack cover. This allows the battery pack assembly to meet the requirements of integration and lightweight design.

[0053] In some embodiments, the thermal conductivity of the heat-conducting element 20 is greater than that of the cover body 10. A higher thermal conductivity of the heat-conducting element 20 compared to the cover body 10 means that the heat-conducting element 20 has a stronger ability to conduct heat, enabling it to quickly transfer heat from high-temperature areas to low-temperature areas. A high thermal conductivity helps improve heat dissipation efficiency and prevent localized overheating. Since the heat-conducting element 20 is in contact with the battery cell 30, a material with a higher thermal conductivity for the heat-conducting element 20 can improve the heat exchange efficiency between the heat-conducting element 20 and the battery cell 30, as well as the uniformity of heat distribution. It can also increase the heat exchange efficiency between the heat-conducting element 20 and the coolant in the cooling channel A, thereby increasing the heat dissipation effect on the battery cell 30. Furthermore, since the cover body 10 does not directly contact the battery cell 30, the cover body 10 can be made of a material with low thermal conductivity but low sealing performance, thereby reducing the mass of the cover body 10. This allows the battery pack cover to provide better heat dissipation for the battery cell 30, reduces the overall weight of the battery pack cover, and meets the compactness requirements of the battery pack cover.

[0054] In some possible embodiments, the material of the cover body 10 includes composite materials. Exemplary examples include sheet molding compounds, long glass fiber or continuous fiber reinforced thermoplastic composites (such as PP, PPE, PPS matrices), etc. Composite materials have high strength and excellent corrosion resistance, good electrical insulation and flame retardant properties, effectively improving the safety protection capabilities of the battery pack assembly. Simultaneously, the low density of composite materials significantly reduces the overall vehicle weight.

[0055] In some possible embodiments, the heat-conducting element 20 is made of aluminum alloy. Aluminum alloy has a high thermal conductivity, enabling rapid conduction and uniform distribution of heat, effectively reducing the risk of localized hot spots. At the same time, compared to other materials with good thermal conductivity, aluminum alloy has a low density and is lightweight, contributing to lightweight design while ensuring good heat dissipation performance.

[0056] like Figure 1As shown, in some embodiments, the cooling channel A includes a first channel A1, and the heat-conducting component 20 includes a heat-spreading portion 21 and a heat-conducting protrusion 22. The heat-spreading portion 21 is located on the side of the protrusion structure 12 away from the main body portion 11 and is connected to the protrusion structure 12. The heat-conducting protrusion 22, the protrusion structure 12, the heat-spreading portion 21, and the main body portion 11 form the first channel A1. The heat-spreading portion 21 is used to contact the battery cell 30 to fix the battery cell 30. The surface of the heat-spreading portion 21 away from the main body portion 11 can contact the battery cell 30, thereby pressing against the battery cell 30 to limit its position. The coolant flowing through the first channel A1 can exchange heat with the heat-spreading portion 21, so that the heat-spreading portion 21 can dissipate heat from the battery cell 30 while fixing it.

[0057] The heat-conducting protrusion 22 connects the heat-spreading section 21 and the main body 11. That is, the heat-conducting protrusion 22 is disposed inside the first flow channel A1. When the coolant flows in the first flow channel A1, the coolant flows through the heat-conducting protrusion 22 and the heat-spreading section 21, exchanging heat with both. Simultaneously, the heat-conducting protrusion 22 has a large surface area, resulting in greater contact with the coolant and thus better heat dissipation. The heat-conducting protrusion 22 also contacts the heat-spreading section 21, facilitating heat exchange between them. The heat-spreading section 21 then contacts the battery cell 30 for heat exchange, enabling the heat-spreading section 21 to dissipate heat from the battery cell 30.

[0058] With this configuration, the coolant in the first flow channel A1 can flow through the heat-conducting protrusion 22 and the heat-spreading section 21, which can increase the contact area between the heat-conducting component 20 and the coolant in the first flow channel A1, thereby increasing the heat dissipation efficiency of the coolant on the heat-conducting component 20, so that the heat-conducting component 20 has a better heat dissipation effect on the battery cell 30.

[0059] In some possible embodiments, the heat-conducting protrusion 22 can be integrally formed with the heat-spreading portion 21. In other possible embodiments, the guide protrusion can also be welded to the heat-spreading portion 21. This application does not limit the specific connection method between the heat-conducting protrusion 22 and the heat-spreading portion 21, and the method can be selected according to the actual situation such as process and cost.

[0060] In some possible embodiments, the heat-conducting protrusion 22 is connected to the main body 11. For example, the heat-conducting part may abut against the main body 11, and the surface of the main body 11 facing the heat-spreading part 21 may also be provided with a retaining groove, in which the heat-conducting protrusion 22 can be retained. This application does not limit the specific connection method between the heat-conducting protrusion 22 and the main body 11, and can select according to actual conditions such as process and cost. The heat-conducting protrusion 22 is connected between the heat-spreading part 21 and the main body 11 so that the heat-conducting protrusion 22 can support the first flow channel A1, thereby ensuring the strength of the first flow channel A1 and the strength of the cover plate body 10. At the same time, the heat-conducting protrusion 22 can transfer the force on the cover plate body 10 to the heat-spreading part 21 and the battery cell 30, thereby enabling the battery cell 30 to help the battery pack assembly share the external stress, thereby improving the overall strength of the battery pack assembly.

[0061] like Figure 1 As shown, in some embodiments, the cooling channel A further includes a second channel A2. The heat-conducting protrusion 22 is provided with the second channel A2, that is, the heat-conducting protrusion 22 itself forms the second channel A2. During the flow of coolant inside the second channel A2, it can further exchange heat with the heat-conducting protrusion 22, so that coolant is provided both inside and outside the heat-conducting protrusion 22. In this way, the second channel A2 can further increase the contact area between the heat-conducting protrusion 22 and the coolant, thereby increasing the heat dissipation efficiency of the heat-conducting protrusion 22, and thus improving the heat dissipation effect of the heat-conducting protrusion 22 on the heat-spreading part 21, and improving the heat dissipation capacity of the heat-conducting component 20 on the battery cell 30. At the same time, it can ensure a sufficient coolant flow rate in the cooling channel A.

[0062] like Figure 1 As shown, in some embodiments, the protrusion structure 12 includes a first protrusion 121 and a second protrusion 122 spaced apart along a first direction C, the first direction C being perpendicular to the thickness direction of the cover body 10; the first protrusion 121 and the second protrusion 122 may be elongated structures, for example, the thickness direction of the cover body 10 may be parallel to the height direction of the vehicle.

[0063] In some possible embodiments, the first direction C can be the width direction of the vehicle, and the first protrusion 121 and the second protrusion 122 can both extend along the length direction of the vehicle. In other possible embodiments, the first direction C can be the length direction of the vehicle, and the first protrusion 121 and the second protrusion 122 can both extend along the width direction of the vehicle. This application does not limit the specific structure of the first protrusion 121 and the second protrusion 122, and they can be selected according to actual conditions such as design and manufacturing process.

[0064] In some possible embodiments, the heat-conducting element 20 may also be in the form of a long strip, the heat-spreading part 21 may be in the form of a long strip plate, and the heat-conducting protrusion 22 may be in the form of a long strip block. The extension direction of the heat-spreading part 21 and the extension direction of the heat-conducting protrusion 22 may both be the same as the extension direction of the first protrusion 121.

[0065] The first protrusion 121 and the second protrusion 122 are both connected between the heat-spreading portion 21 and the main body portion 11. The heat-conducting protrusion 22 is located between the first protrusion 121 and the second protrusion 122. That is, the first protrusion 121, the second protrusion 122, the heat-spreading portion 21, and the main body portion 11 form a first flow channel A1. The first protrusion 121, the heat-conducting protrusion 22, and the second protrusion 122 are arranged sequentially at intervals along the first direction C. The heat-conducting protrusion 22, the first protrusion 121, the heat-spreading portion 21, and the main body portion 11 form a first sub-flow channel A11, and the heat-conducting protrusion 22, the second protrusion 122, the heat-spreading portion 21, and the main body portion 11 form a second sub-flow channel A12. The first sub-flow channel A11 and the second sub-flow channel A12 together form the first flow channel A1.

[0066] The coolant flows in the first sub-channel A11 and the second sub-channel A12 so that the coolant contacts the heat-conducting protrusion 22 on both sides along the first direction C, which further increases the contact area between the heat-conducting protrusion 22 and the coolant, thereby increasing the heat dissipation effect of the coolant on the heat-conducting protrusion 22, and thus increasing the heat dissipation effect of the heat-conducting component 20 on the battery cell 30.

[0067] In some other possible embodiments, the protrusion structure 12 may also be a block structure. The surface of the block structure away from the main body 11 is provided with a groove, and the groove wall and the heat-conducting component 20 form a heat dissipation channel. This application does not limit the specific structure of the protrusion structure 12, and it can be selected according to the actual situation such as cost and process.

[0068] In some embodiments, along the direction from the main body 11 to the heat dissipation section 21, the first protrusion 121 and the second protrusion 122 gradually approach each other; that is, the inner walls of the two opposite flow channels of the first flow channel A1 formed by the first protrusion 121, the second protrusion 122, the main body 11 and the heat dissipation section 21 are inclined surfaces along the first direction C. The inclined inner walls help to reduce flow resistance, improve fluid distribution uniformity, reduce pressure drop, thereby improving the energy efficiency of the cooling system.

[0069] Meanwhile, the first flow channel A1 can have a first cross section, which can be trapezoidal in shape. The first cross section is perpendicular to the extension direction of the first flow channel A1. The trapezoidal structure can enhance the mechanical strength and deformation resistance of the first flow channel A1, thereby improving the overall structural reliability while ensuring lightweight design, and thus increasing the overall structural stability of the battery pack cover.

[0070] In some other possible embodiments, the first protrusion 121 and the second protrusion 122 may gradually move away from each other along the direction from the main body 11 to the heat-spreading part 21. This application does not limit the specific arrangement of the first protrusion 121 and the second protrusion 122, and they can be selected according to the actual situation of design and process.

[0071] In some embodiments, along the first direction C, the two surfaces of the heat-conducting protrusion 22 are a first surface and a second surface, respectively. Along the direction from the main body 11 to the heat-spreading portion 21, the first surface and the second surface gradually move away from each other; that is, the main body 11 may have a second cross-section, which may be trapezoidal in shape and perpendicular to the extending direction of the main body 11. This configuration effectively increases the structural strength of the heat-conducting protrusion 22, further enhancing the structural strength and deformation resistance of the first flow channel A1, thereby more effectively increasing the strength of the first flow channel A1. Simultaneously, it also increases the contact area between the coolant and the heat-conducting protrusion 22, thereby increasing the heat dissipation efficiency of the coolant on the heat-conducting protrusion 22.

[0072] In some possible embodiments, the second flow channel A2 may have a third cross section, which may also be trapezoidal in shape and perpendicular to the extension direction of the second flow channel A2, so that the two inner sidewalls of the second flow channel A2 along the first direction C are inclined surfaces, thereby reducing the flow resistance of the coolant in the second flow channel A2.

[0073] In some possible embodiments, along the direction from the main body 11 to the heat-spreading portion 21, the first protrusion 121 and the second protrusion 122 gradually approach each other. Simultaneously, along the first direction C, the two surfaces of the heat-conducting protrusion 22 are a first surface and a second surface, respectively, and along the direction from the main body 11 to the heat-spreading portion 21, the first surface and the second surface gradually move away from each other. This arrangement allows the fourth cross-section of the first sub-channel A11, the second sub-channel A12, and the fifth cross-section of the fifth sub-channel to all have trapezoidal cross-sections, with the fourth cross-section perpendicular to the extending direction of the first sub-channel A11 and the fifth cross-section perpendicular to the extending direction of the second sub-channel A12.

[0074] Meanwhile, the two opposing inner sidewalls of the first sub-channel A11 along the first direction C are inclined, thereby effectively reducing the flow resistance of the coolant in the first sub-channel A11. Furthermore, the two opposing inner sidewalls of the second sub-channel A12 along the first direction C are also inclined, thereby effectively reducing the flow resistance of the coolant in the second sub-channel A12.

[0075] In some other possible embodiments, along the first direction C, the two surfaces of the heat-conducting protrusion 22 are the first surface and the second surface, respectively. Along the direction from the main body 11 to the heat-spreading part 21, the first surface and the second surface gradually approach each other. This application does not limit the specific setting of the first surface and the second surface, and can select them according to the actual situation such as process and design.

[0076] like Figure 1 As shown, in some embodiments, there are multiple heat-conducting protrusions 22, which are spaced apart along a first direction C. Two adjacent heat-conducting protrusions 22, the heat-spreading portion 21, and the main body portion 11 form a third flow channel A3, and the cooling flow channel A includes the third flow channel A3. Setting the number of heat-conducting protrusions 22 to multiple can further increase the contact area between the heat-conducting element 20 and the coolant, thereby increasing the heat exchange efficiency between the heat-conducting protrusions 22 and the heat-spreading portion 21, so as to improve the heat dissipation efficiency of the heat-conducting element 20 for the battery cell 30.

[0077] like Figure 1 and Figure 2 As shown, in some embodiments, the cooling channel A includes a first cooling channel Aa, a second cooling channel Ab, and a third cooling channel Ac arranged sequentially at intervals along the first direction C. The first cooling channel Aa, the second cooling channel Ab, and the third cooling channel Ac each include a first channel A1 and a second channel A2. In some possible embodiments, the number of protrusions 12 and heat-conducting elements 20 can both be three. The three protrusions 12 are arranged at intervals along the first direction C, and one heat-conducting element 20 corresponds to the first protrusion 12 and is connected to the protrusion 12 corresponding to the heat-conducting element 20.

[0078] In some other possible embodiments, the number of protrusions 12 may also be one. The protrusion 12 is a block structure and has three grooves. It forms a first cooling channel Aa, a second cooling channel Ab, and a third cooling channel Ac with the heat-conducting element 20. This application does not limit the specific reasons for the formation of the first cooling channel Aa, the second cooling channel Ab, and the third cooling channel Ac. They can be selected according to the actual situation such as design and cost.

[0079] The inlet of the first cooling channel Aa and the inlet of the third cooling channel Ac are both used to receive external coolant. The outlet of the first cooling channel Aa and the outlet of the third cooling channel Ac are both connected to the inlet of the second cooling channel Ab, and the outlet of the second cooling channel Ab is used to discharge coolant. In some possible embodiments, a connecting channel E can also be provided on the main body 11 to connect the outlet of the first cooling channel Aa and the inlet of the second cooling channel Ab, as well as the outlet of the third cooling channel Ac and the inlet of the second cooling channel Ab.

[0080] In some possible embodiments, the first cooling channel Aa, the second cooling channel Ab, and the third cooling channel Ac can all be channels with identical structures. The coolant flowing into the first cooling channel Aa and the third cooling channel Ac has a lower temperature, which gradually increases as it flows through them. When it reaches the outlet of the first cooling channel Aa and the third cooling channel Ac, the coolant temperature is higher, resulting in poor heat dissipation. At this point, the coolant flowing out of the first cooling channel Aa and the third cooling channel Ac merges in the second cooling channel Ab. Since the dimensions of the second cooling channel Ab, the first cooling channel Aa, and the third cooling channel Ac are identical, the amount of coolant entering the second cooling channel Ab is the sum of the coolant flowing into the first cooling channel Aa and the third cooling channel Ac. If the total amount of coolant entering the second cooling channel Ab increases without changing the coolant flow size, the flow rate of the coolant in the second channel A2 will increase. The increased flow rate can improve the heat dissipation efficiency of the coolant on the heat-conducting component 20 surrounding the second cooling channel Ab, thereby making the heat dissipation effects of the first cooling channel Aa, the second cooling channel Ab, and the third cooling channel Ac similar.

[0081] In some possible embodiments, the number of first cooling channels Aa, the number of second cooling channels Ab, and the number of third cooling channels Ac can all be multiple. In other possible embodiments, the number of first cooling channels Aa, the number of second cooling channels Ab, and the number of third cooling channels Ac can all be only one. This application does not limit the specific number of first cooling channels Aa, second cooling channels Ab, and third cooling channels Ac, and they can be selected according to the actual situation of design and process.

[0082] like Figure 1 and Figure 3 As shown, in some embodiments, the cover body 10 further includes a reinforcing structure. The main body 11 has a groove B, which is recessed from the side of the main body 11 facing away from the protruding structure 12 toward the protruding structure 12. The reinforcing structure is disposed within the groove B. For example, the groove B may extend along a first direction C, or it may extend along a direction perpendicular to the first direction C and perpendicular to the thickness direction of the cover body 10. The groove B structure can increase the structural strength of the main body 11, thereby increasing the protection capability of the cover body 10 for the battery cell 30, and improving the structural stability of the battery pack. The reinforcing structure disposed inside the groove B can further increase the structural strength of the cover body 10. At the same time, the reinforcing structure can be hidden inside the groove B, thereby preventing protrusions from appearing on the surface of the cover body 10 away from the heat-conducting component 20 that would interfere with other components of the vehicle.

[0083] like Figure 1 and Figure 3 As shown, in some embodiments, the projection of the groove B onto the first plane at least partially coincides with the projection of the protrusion 12 onto the first plane, and the first plane is perpendicular to the thickness direction of the cover body 10; in some possible embodiments, the projection of the groove B onto the first plane and the projection of the protrusion 12 onto the first plane may completely coincide, or they may partially coincide. This arrangement can further increase the strength of the cover body 10, thereby improving the structural stability of the battery pack assembly.

[0084] like Figure 1 and Figure 3 As shown, in some embodiments, the reinforcing structure includes a plurality of reinforcing ribs 13, which are spaced apart along a second direction D. Adjacent reinforcing ribs 13 are inclined relative to each other, and the second direction D is perpendicular to the thickness direction of the cover plate body 10. The second direction D may be perpendicular to the first direction C, and the second direction D is perpendicular to the thickness direction of the cover plate body 10.

[0085] In some possible embodiments, the multiple reinforcing ribs 13 can be integrally formed with the main body 11. In other possible embodiments, the multiple reinforcing ribs 13 can also be bonded to the main body 11. This application does not limit the specific connection method between the reinforcing ribs 13 and the main body 11, and can select according to the actual situation such as process and design.

[0086] This design effectively improves the overall stiffness and deformation resistance of the cover plate body 10. The inclined stiffeners 13 can form a truss-like or cross-bracing effect, which not only enhances the load-bearing capacity of the structure under multi-directional loads, but also distributes stress more evenly and suppresses local buckling. At the same time, this layout optimizes the material distribution without significantly increasing the weight, taking into account both lightweight and high strength requirements.

[0087] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. A battery pack cover, characterized in that, For use in a battery pack assembly, the battery pack cover includes a cover body (10) and a heat-conducting element (20). The cover body (10) includes a main body (11) and a protruding structure (12) connected to the main body (11). Along the thickness direction of the cover body (10), the protruding structure (12) is provided on one side of the main body (11). The heat-conducting element (20) is connected to the protruding structure (12), and the heat-conducting element (20), the protruding structure (12) and the main body (11) form a cooling channel (A). The heat-conducting element (20) is used to contact the battery cell (30) of the battery pack assembly to fix the battery cell (30).

2. The battery pack cover according to claim 1, characterized in that, The density of the cover plate body (10) is less than the density of the heat-conducting element (20); and / or, the thermal conductivity of the heat-conducting element (20) is greater than the thermal conductivity of the cover plate body (10).

3. The battery pack cover according to claim 1, characterized in that, The material of the cover plate body (10) includes composite material, and the material of the heat-conducting component (20) includes aluminum alloy material.

4. The battery pack cover according to any one of claims 1-3, characterized in that, The heat-conducting component (20) includes a heat-spreading section (21) and a heat-conducting protrusion (22). The heat-spreading section (21) is located on the side of the protrusion structure (12) away from the main body (11) and is connected to the protrusion structure (12). The heat-spreading section (21) is used to contact the battery cell (30) to fix the battery cell (30). The heat-conducting protrusion (22) is connected between the heat-spreading part (21) and the main body part (11). The heat-conducting protrusion (22), the protrusion structure (12), the heat-spreading part (21) and the main body part (11) form a first flow channel (A1). A second flow channel (A2) is provided inside the heat-conducting protrusion (22). The cooling flow channel (A) includes the first flow channel (A1) and the second flow channel (A2).

5. The battery pack cover according to claim 4, characterized in that, The protrusion structure (12) includes a first protrusion (121) and a second protrusion (122) spaced apart along a first direction (C), the first direction (C) being perpendicular to the thickness direction of the cover plate body (10); The first protrusion (121) and the second protrusion (122) are both connected between the heat-spreading part (21) and the main body part (11). The heat-conducting protrusion (22) is located between the first protrusion (121) and the second protrusion (122). The heat-conducting protrusion (22), the first protrusion (121), the heat-spreading part (21) and the main body part (11) form a first sub-channel (A11). The heat-conducting protrusion (22), the second protrusion (122), the heat-spreading part (21) and the main body part (11) form a second sub-channel (A12). The first sub-channel (A11) and the second sub-channel (A12) form the first channel (A1).

6. The battery pack cover according to claim 5, characterized in that, Along the direction from the main body (11) to the heat-spreading part (21), the first protrusion (121) and the second protrusion (122) gradually approach each other; And / or, along the first direction (C), the two surfaces of the heat-conducting protrusion (22) are a first surface and a second surface, respectively, and along the direction from the main body (11) to the heat-spreading part (21), the first surface and the second surface gradually move away from each other; And / or, the number of the heat-conducting protrusions (22) is multiple, and the multiple heat-conducting protrusions (22) are spaced apart along the first direction (C). Two adjacent heat-conducting protrusions (22), the heat-spreading part (21) and the main body part (11) form a third flow channel (A3), and the cooling flow channel (A) includes the third flow channel (A3).

7. The battery pack cover according to claim 4, characterized in that, The cooling channel (A) includes a first cooling channel (Aa), a second cooling channel (Ab) and a third cooling channel (Ac) arranged sequentially at intervals along a first direction (C), wherein the first cooling channel (Aa), the second cooling channel (Ab) and the third cooling channel (Ac) each include the first channel (A1) and the second channel (A2); The inlet of the first cooling channel (Aa) and the inlet of the third cooling channel (Ac) are both used to connect to external coolant. The outlet of the first cooling channel (Aa) and the outlet of the third cooling channel (Ac) are both connected to the inlet of the second cooling channel (Ab). The outlet of the second cooling channel (Ab) is used to discharge coolant.

8. The battery pack cover according to any one of claims 1-3, characterized in that, The cover plate body (10) also includes a reinforcing structure. The main body (11) is provided with a groove (B). The groove (B) is recessed from the side surface of the main body (11) facing away from the protruding structure (12) toward the protruding structure (12). The reinforcing structure is provided in the groove (B).

9. The battery pack cover according to claim 8, characterized in that, The projection of the groove (B) onto the first plane at least partially coincides with the projection of the protrusion structure (12) onto the first plane, the first plane being perpendicular to the thickness direction of the cover plate body (10). And / or, the reinforcing structure includes a plurality of reinforcing ribs (13), the plurality of reinforcing ribs (13) are spaced apart along a second direction (D), two adjacent reinforcing ribs (13) are inclined relative to each other, and the second direction (D) is perpendicular to the thickness direction of the cover plate body (10).

10. A battery pack housing, characterized in that, Includes the battery pack cover as described in any one of claims 1-9.

11. A battery pack assembly, characterized in that, Includes the battery pack housing as described in claim 10.

12. A vehicle, characterized in that, Includes the battery pack assembly as described in claim 11.

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