Upper cover assembly, battery pack and electric device

Abstract

The present application relates to the technical field of batteries. Provided are an upper cover assembly, a battery pack and an electric device. The upper cover assembly comprises a first substrate and a second substrate, wherein the first substrate comprises a first substrate main body and a first extension portion connected to at least one side edge of the first substrate main body; and the second substrate is connected to the first substrate, and a second cavity is provided between the second substrate and the first extension portion.

Description

Top cover assembly, battery pack and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411751653.3, filed on November 29, 2024, entitled “A Battery Pack and Vehicle”, and Chinese Patent Application No. 202422966054.5, filed on November 29, 2024, entitled “A Top Cover Assembly, a Battery Pack and an Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and more particularly to a cover assembly, a battery pack, and an electrical device. Background Technology

[0003] Battery packs are used to provide power to electrical equipment such as electric vehicles.

[0004] The battery pack consists of a tray, a top cover, and battery cells. The top cover sits on the tray, and the space between the tray and the top cover forms a receiving cavity, within which the battery cells are located. One side of the top cover is connected to the tray, and the other side is connected to the electrical device. Therefore, the top cover requires high strength. Strength can be increased by increasing the thickness of the top cover, but this increases the material cost of the top cover.

[0005] In related technologies, it is difficult to achieve both high strength and low cost for the top cover of a battery pack. Summary of the Invention

[0006] This application provides a cover assembly, a battery pack, and an electrical device, wherein the cover assembly can combine high strength with low weight.

[0007] This application provides a top cover assembly, including: a first substrate and a second substrate, the first substrate including a first substrate body and a first extension connected to at least one side edge of the first substrate body; the second substrate is connected to the first substrate, and a second cavity is formed between the second substrate and the first extension.

[0008] The cover assembly provided in this application includes a first substrate and a second substrate. The first substrate includes a first substrate body and a first extension connected to at least one side of the first substrate body. A second cavity is provided between the first extension and the second substrate, which can increase the strength of the cover assembly. The thickness of the first substrate and the reinforcing plate is set to be small, so that the material cost of the cover assembly is small. Thus, the cover assembly can have both high strength and low cost.

[0009] In one possible implementation, the cover assembly provided in this application includes a second substrate body and a second extension connected to at least one side edge of the second substrate body; the second substrate body is connected to the first substrate body, and a second cavity is provided between the first extension and the second extension.

[0010] In one possible implementation, the cover assembly provided in this application has a first extension bent away from the second extension from the first substrate body to form a second cavity between the first extension and the second extension.

[0011] In one possible implementation, the cover assembly provided in this application has a portion of the second extension bent toward the first extension and connected to the first extension.

[0012] In one possible implementation, the top cover assembly provided in this application further includes a fastening connector, through which the second extension and the first extension are connected, and the fastening connector is used to connect to the lower frame of the battery pack.

[0013] In one possible implementation, the cover assembly provided in this application has the first extension portion connected to at least both sides of the first substrate body along the first direction, and the second extension portion connected to at least both sides of the second substrate body along the first direction.

[0014] In one possible implementation, the cover assembly provided in this application has at least one stress-buffering window on the second substrate body.

[0015] In one possible implementation, the cover assembly provided in this application has a first seal between the second substrate body and the first substrate body, the first seal being located at the edge of the second substrate body, and / or the first seal being located around the stress buffer window.

[0016] In one possible implementation, the top cover assembly provided in this application has a maintenance window on one side of the first substrate body along the second direction, a first extension is connected to the other edge of the first substrate body along the second direction, a second extension is connected to the edge of the second substrate body along the second direction corresponding to the first extension, the projection of the second substrate body on the first substrate body is spaced apart from the maintenance window, and the second direction intersects the first direction.

[0017] In one possible implementation, the cover assembly provided in this application further includes at least one crossbeam, which extends along the first direction and is disposed on the side of the second substrate body opposite to the first substrate body, and the crossbeam is connected to the second substrate body.

[0018] In one possible implementation, the top cover assembly provided in this application further includes a plurality of lifting lugs corresponding to both ends of the crossbeam. The lifting lugs are at least partially located in the second cavity. Each lifting lug includes a first lifting lug connecting portion and a second lifting lug connecting portion. The first lifting lug connecting portion is connected to the first extension portion, and the second lifting lug connecting portion is connected to the second extension portion. The lifting lugs are used to connect to electrical equipment.

[0019] In one possible implementation, the cover assembly provided in this application further includes a filler attached to at least a portion of the outer peripheral surface of the lug and to the first extension and the second extension.

[0020] In one possible implementation, the top cover assembly provided in this application has a hollow structure between the crossbeam and the second base plate body, and a second connector is provided in the hollow structure for connecting to electrical equipment.

[0021] In one possible implementation, the cover assembly provided in this application further includes a filler that fills the second cavity.

[0022] In one possible implementation, the cover assembly provided in this application further includes a lug connecting the first extension and the second extension, the lug being used for connection to electrical equipment.

[0023] In one possible implementation, the top cover assembly provided in this application further includes a second reinforcing plate. A maintenance window is provided on one side of the first substrate body along a second direction. The projection of the second substrate body on the first substrate body is spaced apart from the maintenance window. The first extension is connected to the edge of the first substrate body near the maintenance window. The second reinforcing plate surrounds at least one side of the maintenance window and is connected to the first extension. The second direction intersects the first direction.

[0024] In one possible implementation, the top cover assembly provided in this application includes a second reinforcing plate comprising a water-retaining edge that wraps around the side of the first extension.

[0025] In one possible implementation, the top cover assembly provided in this application further includes a maintenance window cover plate, which covers the maintenance window and is connected to the first base plate body by projection welding nuts.

[0026] In one possible implementation, the top cover assembly provided in this application further includes a first expansion limiting structure, which is connected to the side of the first substrate body away from the second substrate, and is used to limit the position of the battery cell unit.

[0027] In a second aspect, this application provides a battery pack including a cell unit, a lower frame, and the aforementioned upper cover assembly, wherein the upper cover assembly covers the lower frame, and a receiving cavity is formed between the upper cover assembly and the lower frame, and the cell unit is located in the receiving cavity.

[0028] In one possible implementation, the battery pack provided in this application further includes an adhesive for bonding the battery cell unit and the first substrate.

[0029] A third aspect of this application provides a battery pack comprising: a top cover assembly configured to be at least connected to a vehicle frame, the top cover assembly forming a force-transmitting structure from its interior toward its edge; a lower frame sealed to the top cover assembly and forming a receiving cavity; and a cell unit at least partially connected to the top cover assembly, the cell unit being disposed in the receiving cavity.

[0030] The battery pack of this application is based on a force-transmitting structure on the top cover assembly. This force-transmitting structure gives the top cover assembly excellent structural strength and rigidity from its interior to its edge. The strength and rigidity of the top cover assembly are sufficient to support the connection between the top cover assembly and the vehicle frame, the connection between the top cover assembly and the lower frame, and the connection between the top cover assembly and the battery cell unit. This eliminates the need for structures such as intermediate crossbeams in conventional technologies within the battery pack, providing more space for the battery cell unit. The battery cell unit can fill the internal space of the battery pack, thereby improving the space utilization rate within the battery pack and thus increasing the battery pack capacity.

[0031] In one possible implementation, the cover assembly includes a substrate assembly, and the force transmission structure includes a first force transmission structure connected to one side of the substrate assembly.

[0032] In one possible implementation, the first force transmission structure includes a plurality of crossbeams arranged along the width direction of the upper cover assembly, the plurality of crossbeams being spaced apart and arranged parallel to each other on the base plate assembly.

[0033] In one possible implementation, the beam is a solid structure.

[0034] In one possible implementation, the beam is designed to have a first cavity.

[0035] In one possible implementation, the crossbeam includes: a connecting portion connected to the substrate assembly; and a protrusion connected to the connecting portion and forming the first cavity.

[0036] In one possible implementation, the protrusion has openings at both ends, and the crossbeam further includes an end plate that is obliquely disposed at the opening.

[0037] In one possible implementation, at least a portion of the edge of the cover assembly is formed with a second cavity, the second cavity forming a second force transmission structure.

[0038] In one possible implementation, the substrate assembly includes: a first substrate; and a second substrate, the second substrate being connected to the first substrate and forming the second cavity, the crossbeam being connected to the second substrate.

[0039] In one possible implementation, the crossbeam divides the area where the substrate assembly is located into several first regions, and the second substrate includes: a plurality of region structures, each of the region structures forming a second region corresponding to the first region.

[0040] In one possible implementation, the second substrate includes: an edge structure portion disposed circumferentially; and an intermediate structure portion disposed inside the edge structure portion to divide the edge structure portion into a plurality of second regions, wherein the edge structure portion and the intermediate structure portion surround the second regions to form the region structure.

[0041] In one possible implementation, a first seal is provided between the first substrate and the second substrate, the first seal extending in a manner corresponding to the regional structure.

[0042] In one possible implementation, a first recessed region is formed at the edge of the first substrate; and / or, a second recessed region is formed at the edge of the second substrate.

[0043] In one possible implementation, the first substrate includes a first substrate body and a first extension, the first extension being bent outward from the edge of the first substrate body and forming the first recessed region; and / or, the second substrate includes a second substrate body and a second extension, the second extension being bent outward from the edge of the second substrate body and forming the second recessed region.

[0044] In one possible implementation, the second cavity is filled with an expandable filler.

[0045] In one possible implementation, the battery pack further includes a connection structure disposed at the edge of the top cover assembly, the connection structure forming an installation channel.

[0046] In one possible implementation, the connection structure includes a first connection structure disposed in the second cavity, the first connection structure being disposed at the end of the crossbeam.

[0047] In one possible implementation, the first connection structure includes a lug assembly inserted into the second cavity, the lug assembly having a port, the lug assembly forming the mounting channel, and the outer wall surface of the lug assembly being connected to the first substrate and the second substrate.

[0048] In one possible implementation, the lug assembly includes: a lug, wherein a first step is formed at a position of the lug corresponding to the first substrate, and a second step is formed at a position of the lug corresponding to the second substrate.

[0049] In one possible implementation, the lug includes: a first connecting segment corresponding to the first substrate and forming the first step; a second connecting segment corresponding to the second substrate and forming the second step; and a third connecting segment connected between the first connecting segment and the second connecting segment, wherein the outer diameter of the first connecting segment is larger than the outer diameter of the second connecting segment, and at least a portion of the outer wall surface of the third connecting segment is inclined.

[0050] In one possible implementation, the lug assembly further includes: a bushing disposed within the mounting channel, the bushing extending from one side of the first substrate, the bushing having a bushing cavity communicating with the mounting channel, a gap being formed between the bushing and the first substrate, and a portion of the lower frame being confined within the gap.

[0051] In one possible implementation, the lug assembly further includes a sealing plug that is sealingly connected within the bushing cavity.

[0052] In one possible implementation, a second seal is provided between the lug and the frame.

[0053] In one possible implementation, a third seal is provided between the lug and the bushing, and a fourth seal is provided between the bushing and the sealing plug.

[0054] In one possible implementation, the first connection structure has an outer side facing the edge of the cover assembly and an inner side facing away from the edge of the cover assembly, and a reinforcing structure is filled between the first substrate and the second substrate, the reinforcing structure being located outside the first connection structure, or the reinforcing structure being located outside and inside the first connection structure.

[0055] In one possible implementation, the connection structure includes a second connection structure disposed at both ends of the upper cover assembly along the length direction, wherein the first substrate and the second substrate are attached to each other at both ends along the length direction, or the second substrate is recessed inward along the length direction from the first substrate to form at least one single-layer structural portion not covered by the second substrate at the end of the first substrate.

[0056] In one possible implementation, a structural adhesive layer is provided on the side of the upper cover assembly facing the lower frame, and the battery cell is connected to the structural adhesive layer.

[0057] In one possible implementation, the top cover assembly is provided with an adhesive groove, into which at least a portion of the structural adhesive layer is embedded.

[0058] In one possible implementation, the top cover assembly includes: a first expansion limiting structure disposed on the substrate assembly, wherein the battery cells are constrained between the first expansion limiting structures.

[0059] In one possible implementation, the first expansion limiting structure includes: an expansion beam abutting against the battery cell; and a support bracket supported on the side of the expansion beam opposite to the battery cell.

[0060] In one possible implementation, the expansion beam comprises: an outer beam designed to have a third cavity; and an inner beam disposed within the third cavity.

[0061] In one possible implementation, the support bracket includes: a first support portion abutting against the expansion beam; a second support portion abutting against the substrate assembly; and a third support portion connected between the first support portion and the second support portion, the third support portion forming a fourth cavity.

[0062] In one possible implementation, the first expansion limiting structure further includes a stop block disposed on the lower frame, the stop block being located on the side of the expansion beam opposite to the cell unit, the stop block being used to limit the expansion beam.

[0063] In one possible implementation, the lower frame includes a cold plate that forms the receiving cavity with the upper cover assembly, the cold plate being connected to the upper cover assembly.

[0064] In one possible implementation, a first recessed receiving area is formed on the side of the top cover assembly facing the battery cell, and a second recessed receiving area is formed on the cold plate corresponding to the position of the first recessed receiving area.

[0065] In one possible implementation, the cold plate includes: a heat spreader plate; and a flow channel plate, the flow channel plate being stacked with the heat spreader plate, both the heat spreader plate and the flow channel plate being designed as recessed structures recessed in a direction away from the top cover assembly.

[0066] In one possible implementation, the edge of the heat spreader is provided with a first edge in the circumferential direction; the edge of the flow channel plate is provided with a second edge in the circumferential direction, and the first edge is provided with a first connecting portion for connecting with the upper cover assembly at intervals; the second edge is provided with a second connecting portion for connecting with the upper cover assembly at intervals.

[0067] In one possible implementation, the inner side of the heat spreader is provided with a first reinforcing rib, and the inner side of the flow channel plate is provided with a second reinforcing rib corresponding to the position of the first reinforcing rib.

[0068] In one possible implementation, the heat spreader is designed as a multi-layered structure, with adjacent layers made of different materials; the flow channel plate is designed as a multi-layered structure, with adjacent layers made of different materials.

[0069] In one possible implementation, the cold plate is provided with a plug-in base, and the battery pack further includes a power distribution box, which is disposed on the cold plate and connected to the plug-in base.

[0070] In one possible implementation, the lower frame further includes a protective plate connected to the cold plate and located on the side of the cold plate away from the upper cover assembly.

[0071] In one possible implementation, the upper cover assembly is formed with a cavity in which force-transmitting crossbeams and force-transmitting longitudinal beams are arranged in a crisscross pattern.

[0072] A fourth aspect of this application provides an electrical device, the electrical device including a mounting frame and the aforementioned battery pack, the battery pack including a top cover assembly, the top cover assembly being connected to the mounting frame.

[0073] In one possible implementation, the electrical device further includes a sealing ring disposed between the mounting bracket and the top cover assembly.

[0074] In one possible implementation, the electrical equipment is a vehicle, the mounting bracket is a vehicle frame, the sealing ring is a vehicle body sealing ring, and the vehicle body sealing ring is disposed between the vehicle frame and the upper cover assembly. Attached Figure Description

[0075] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0076] Figure 1 shows a schematic diagram of the installation of a battery pack and chassis of a vehicle according to an embodiment of this application;

[0077] Figure 2 shows a schematic diagram of the installation of a vehicle battery pack according to an embodiment of this application;

[0078] Figure 3 shows a schematic diagram of the connection structure of a battery pack according to an embodiment of this application;

[0079] Figure 4 shows an exploded schematic diagram of a battery pack according to an embodiment of this application;

[0080] Figure 5 shows a structural schematic diagram of a top cover assembly provided according to an embodiment of this application;

[0081] Figure 6 shows a structural schematic diagram of a top cover assembly provided according to an embodiment of this application from another angle;

[0082] Figure 7 shows an exploded view of a cover assembly provided according to an embodiment of this application;

[0083] Figure 8 shows a partial cross-sectional view along the AA direction in Figure 6;

[0084] Figure 9 shows a cross-sectional view of a battery pack according to an embodiment of this application;

[0085] Figure 10 shows a magnified view of part B in Figure 9;

[0086] Figure 11 shows a schematic diagram of a first expansion limiting structure provided according to an embodiment of this application;

[0087] Figure 12 shows a schematic diagram of a cold plate according to an embodiment of this application;

[0088] Figure 13 is an exploded schematic diagram of the electrical equipment provided in an embodiment of this application;

[0089] Figure 14 is a schematic diagram of the battery pack provided in an embodiment of this application;

[0090] Figure 15 is an exploded view of the battery pack provided in an embodiment of this application;

[0091] Figure 16 is a structural schematic diagram of the top cover assembly provided in an embodiment of this application;

[0092] Figure 17 is an exploded view of the top cover assembly provided in an embodiment of this application;

[0093] Figure 18 is a cross-sectional view along CC in Figure 16;

[0094] Figure 19 is a structural schematic diagram of the top cover assembly provided in an embodiment of this application from another angle;

[0095] Figure 20 is a structural schematic diagram of the upper cover assembly and cell unit in the battery pack provided in the embodiment of this application;

[0096] Figure 21 is a second cross-sectional view along CC in Figure 16;

[0097] Figure 22 is a cross-sectional view along DD in Figure 16;

[0098] Figure 23 is a cross-sectional view along EE in Figure 18;

[0099] Figure 24 is an enlarged view of point F in Figure 16.

[0100] Reference numerals: 1000 - Vehicle; 100 - Top cover assembly; 101 - Second cavity; 102 - Adhesive groove; 110 - Substrate assembly; 120 - First seal; 130 - First expansion limiting structure; 111 - First substrate; 112 - Second substrate; 113 - Tilt arm; 114 - Reinforcing structure; 110a - First region; 120a - Third region; 112a - Second region; 131 - Expansion beam; 132 - Support leg; 133 - Stop; 1111 - First recessed region; 1112 - First substrate body; 1113 - First extension; 1114 - Welding opening; 1121 - Regional structure; 1122 - Edge structure; 1123 - Middle structure; 1124 - Second recessed area; 1125 - Second substrate body; 1126 - Second extension; 1311 - Outer beam; 1312 - Inner beam; 1321 - First support; 1322 - Second support; 1323 - Third support; 1311a - Third cavity; 124 - Second reinforcing plate; 125 - Water-retaining edge; 1211 - Stress buffer window; 140 - Filler; 172 - Second connector; 173 - Through hole; 190 - Maintenance window cover; 200-Lower frame; 210-Cold plate; 220-Distribution box; 230-Protective plate; 211-Heat distribution plate; 212-Flow channel plate; 213-Plug-in base; 2111-First edge; 2112-First mounting part; 2113-First reinforcing rib; 2121-Second edge; 2122-Second mounting part; 300-Battery cell unit; 310-Battery cell; 400-Force transmission structure; 410-First force transmission structure; 420-Second force transmission structure; 430-Third force transmission structure; 440-Fourth force transmission structure; 450-Sixth force transmission structure; 411-Crossbeam; 4111-First cavity; 4112-Connecting part; 4113-Protrusion; 4114-End plate; 500 - Connection structure; 501 - Mounting channel; 510 - First connection structure; 520 - Second connection structure; 511 - Lifting lug assembly; 511a - Port; 5111 - Lifting lug; 5112 - Bushing; 5113 - Sealing plug; 5114 - Second seal; 5115 - Third seal; 5116 - Fourth seal; 5111a - First step; 5111b - Second step; 5111c - First connecting section; 5111d - Second connecting section; 5111e - Third connecting section; 5112a - Bushing cavity; 5112b - Flange; 600 - Body sealing ring; 700 - Structural adhesive layer; 10 - Chassis; 11 - Frame; 11a - Main beam; 11b - Crossbeam; 11c - Mounting hole; 11b1 - Left crossbeam; 11b2 - Middle beam; 11b3 - Right crossbeam; 20-Battery pack; 21-Left short side; 22-Right short side; 23-First sub-region; 24-Second sub-region; 25-Third sub-region; 26-Fourth sub-region; 27-Reception cavity. Detailed Implementation

[0101] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0102] This application provides a battery pack and an electrical device including the battery pack. The electrical device includes an electrical appliance, and the battery pack can provide electrical energy to the electrical appliance. In this application embodiment, the electrical appliance can be a vehicle. Based on the design of the battery pack in this application embodiment, the vehicle has stronger power performance and smoother power delivery. The vehicle can be a new energy vehicle, such as a pure electric vehicle (PEV / BEV), a range-extended electric vehicle (REEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle. The vehicle can also be any vehicle with a battery.

[0103] With the rapid development of new energy vehicle technology, on-board battery packs are also undergoing rapid development. An on-board battery pack refers to a battery structure that can be installed in a vehicle to provide power. From a technological evolution perspective, on-board battery packs can be divided into three main stages. The first stage is the CTM (Cell to Module) stage. In this stage, cells need to be integrated into cell units, which are then assembled into a battery pack before being installed in the vehicle. This first-stage battery pack is characterized by high installation specificity, with clearly defined structural layers. The second stage is the CTP (Cell to Pack) stage. In this stage, the process of assembling cell units can be eliminated; the cells can be directly assembled into a battery pack before being installed in the vehicle. Because this second-stage battery pack eliminates the cell integration process, it offers several advantages, including reduced cost, improved installation efficiency, and increased battery pack capacity. The third stage is CTB (Cell to Body), which is another technological evolution of CTP. In this stage, the battery pack is formed directly from individual cells, and the battery pack cover becomes part of the vehicle as the vehicle floor. This third-stage battery pack has many advantages, such as further reducing the cost of the whole vehicle, further improving the installation efficiency of the whole vehicle, and further increasing the battery pack capacity, because it eliminates the process of integrating cells into cell units and the vehicle structure.

[0104] In the three stages mentioned above, the battery pack can be installed on the vehicle's chassis. The structural strength and rigidity of the chassis have a significant impact on the overall vehicle performance. The quality of the chassis design affects the vehicle's driving performance, comfort, force transmission performance, and vibration damping performance. It is understood that adding a battery pack to the chassis will damage the chassis's inherent structure and performance. To minimize this damage, the strength and rigidity of the battery pack, as well as the connection between the battery pack and the chassis, need to be designed to ensure that the installation of the battery pack does not affect the chassis's inherent performance. Understandably, based on this, employing appropriate design methods can even improve the performance of the chassis and battery pack to a certain extent.

[0105] The main challenges in implementing CTB technology in vehicles lie in the connection and sealing design between the battery pack and the vehicle. The former includes not only the structural design of the battery pack itself and the vehicle, but also the design of the connection structure between them. The latter mainly involves the sealing design of the battery pack itself and the sealing design between the battery pack and the vehicle. Regarding the connection design, not only does the battery pack itself need sufficient strength and rigidity, but sufficient connection strength and rigidity must also be formed between the battery pack and the vehicle. Based on strength and rigidity considerations, the battery pack in the CTB architecture typically requires a tray to support the individual cell units. Within this tray, a central crossbeam is designed to provide strength support and rigidity extension. The tray connects to the vehicle via this central crossbeam. This central crossbeam occupies space within the tray, reducing the space utilization of the cell units and thus affecting the battery pack's capacity. Regarding the sealing design, when connecting to the vehicle via the central crossbeam, a related structure is needed to seal the battery pack connection, resulting in structural complexity and difficulties in guaranteeing sealing performance.

[0106] In summary, current battery packs under the CTB architecture, based on considerations such as strength and rigidity, typically require a tray with a central crossbeam. This tray design introduces flaws in connection design, sealing design, and connection process design. Specifically, the tray reduces the space utilization of the cell units, thus affecting the battery pack's capacity. Furthermore, it makes achieving a proper seal between the battery pack and the vehicle difficult, resulting in a complex structure and compromised sealing performance. Finally, it increases the difficulty of battery pack installation.

[0107] Based on the above-mentioned situation and problems, this application provides a battery pack with an overall trayless structure. The battery pack can form a stable and independent structure before being installed in a vehicle, which can reduce the installation difficulty of the battery pack and also achieve the sealing work of the battery pack before it is installed in the vehicle, thereby simplifying the structure and improving the sealing performance.

[0108] Furthermore, in this embodiment of the battery pack, the structural components that provide strength support and rigidity extension are moved from the inside to the outside, which can provide more space for the cell units. The cell units can fill the internal space of the battery pack, thereby improving the space utilization of the cell units and thus increasing the capacity of the battery pack.

[0109] It is understandable that, since the battery pack moves its main structural components, which provide strength support and rigidity extension, from the inside of the battery pack to the outside, these structural components need to have excellent strength, rigidity, and installability. To this end, the embodiments of this application can ensure the strength and rigidity of the structural components through structural design, material selection, and process design, while also controlling costs.

[0110] The installability of the aforementioned structural component indicates that the structural component can be mounted on a vehicle, for example, onto the chassis frame, and after installation, the configuration of the structural component can create the required strength and rigidity between the vehicle and the battery pack.

[0111] The battery pack in this application embodiment can be applied to some vehicles such as the aforementioned new energy vehicles. Taking a new energy vehicle as an example, in order to adapt to the aforementioned battery pack, its related structure can be designed. For example, a chassis is usually set at the bottom of a new energy vehicle. The chassis can include a frame. The frame can include two beams that are spaced apart and arranged in parallel. Multiple cross beams can be set between the two beams as needed. There can be three or other cross beams. The three cross beams can be the front seat cross beam, the middle cross beam, and the rear seat cross beam.

[0112] The battery pack can be installed on the chassis. Specifically, the aforementioned structural components of the battery pack can be connected to the chassis beams and crossbeams. Based on the strength, rigidity, and installability of the structural components, the chassis and battery pack can achieve structural and performance uniformity, which is beneficial to improving the overall performance of the vehicle.

[0113] Figure 1 shows a schematic diagram of the installation of a battery pack and chassis of a vehicle according to an embodiment of the present application; Figure 2 shows a schematic diagram of the installation of a battery pack of a vehicle according to an embodiment of the present application.

[0114] In this embodiment of the application, the vehicle includes a chassis 10 and a battery pack 20. The chassis 10 includes the aforementioned frame 11, which includes a main beam 11a and a cross beam 11b. The cross beam 11b is connected between the two main beams 11a. Specifically, the cross beam 11b and the main beam 11a can be welded together.

[0115] The battery pack 20 can form an independent and stable structure before being installed onto the frame 11. The battery pack 20 can be sealed before being installed onto the frame 11, which can reduce the installation difficulty of the battery pack 20 and can also achieve the sealing work of the battery pack 20 before it is installed onto the vehicle, which can simplify the structure and improve the sealing performance.

[0116] The frame 11 has mounting holes 11c on the main beam 11a and the cross beam 11b. Correspondingly, the battery pack 20 has a connecting structure 500 at the position corresponding to the main beam 11a and the cross beam 11b. Here, the connecting structure 500 can be the first connecting structure 510 in the following embodiment, or it can be a combination of the first connecting structure 510 and the second connecting structure 520. The first connecting structure 510 and the second connecting structure 520 can be arranged corresponding to the main beam 11a and the cross beam 11b.

[0117] For example, in some embodiments, the first connecting structure 510 can be set to correspond to the crossbeam 11b, and the second connecting structure 520 can be set to correspond to the main beam 11a. Based on the connection relationship between the battery pack 20 and the vehicle, i.e. the connection design considerations mentioned above, the first connecting structure 510 and its surroundings can be composed of structures with excellent strength and rigidity. The second connecting structure 520 can be a common connecting structure 500, such as the bolt lug 5111 structure commonly used in the vehicle battery pack 20.

[0118] In some embodiments, a first connection structure 510 may also be provided on the battery pack 20 at a position corresponding to the main beam 11a, thereby improving the connection strength between the battery pack 20 and the vehicle.

[0119] It should be noted that, based on the dimensional relationship between the frame 11 and the battery pack 20, the number of connecting structures 500 can be set according to actual needs. For example, corresponding to the main beam 11a, 17 connecting structures 500 can be set on the edge of the battery pack 20. Multiple connecting structures 500 can be set on each of the two short sides of the battery pack 20, such as 4 or 5. For example, 4 connecting structures 500 can be set on one short side and 5 on the other. 4 connecting structures 500 can be set on each of the two long sides of the battery pack 20. Of course, in other embodiments, the number of connecting structures 500 can also be varied, for example, a total of 8, 12, or other values. The number of connecting structures 500 on each long and short side can also be varied. Furthermore, corresponding to the crossbeam 11b, 4 or other values ​​of connecting structures 500 can be set at the corresponding positions of the battery pack 20.

[0120] Figure 3 shows a schematic diagram of the arrangement of a connection structure 500 for a battery pack according to an embodiment of this application.

[0121] Taking the orientation shown in Figures 1 and 3 as an example, the two short sides of the battery pack 20 are located on both sides of the X direction, and the two long sides of the battery pack 20 are located on both sides of the Y direction. That is, along the X direction, the battery pack 20 has 4 or 5 connecting structures 500 on its short sides, and along the Y direction, the battery pack 20 has 4 connecting structures 500 on its long sides. At the positions of the battery pack 20 located between the two short sides and corresponding to the three crossbeams 11b, there are 4 connecting structures 500 at each position.

[0122] In this embodiment, the battery pack 20 can achieve a stable connection between the battery pack 20 and the vehicle by setting different numbers or different types of connection structures 500 at positions corresponding to the crossbeam 11b and the main beam 11a. The connection force between the vehicle and the battery pack 20 can be evenly distributed at various positions between the vehicle and the battery pack 20, which is beneficial to improving the connection strength and rigidity between the vehicle and the battery pack 20.

[0123] In addition, the multiple connection structures 500 can divide the area where the battery pack 20 is located into several sub-regions. When the aforementioned connection force or the battery pack 20 is subjected to external impact force, these forces can be quickly transmitted to various positions between the battery pack 20 and the vehicle, which can strengthen the rigid connection between the battery pack 20 and the vehicle.

[0124] Specifically, referring to Figures 1 and 2, for ease of description, along the X direction, the three crossbeams 11b on the frame 11 are the left crossbeam 11b1, the middle crossbeam 11b2, and the right crossbeam 11b3, respectively, and the short sides on the battery pack 20 are the left short side 21 and the right short side 22. The connection structure 500 corresponding to the left short side 21 and the left crossbeam 11b1 forms a first sub-region 23, the connection structure 500 corresponding to the left crossbeam 11b1 and the middle crossbeam 11b2 forms a second sub-region 24, the connection structure 500 corresponding to the middle crossbeam 11b2 and the right crossbeam 11b3 forms a third sub-region 25, and the connection structure 500 corresponding to the right crossbeam 11b3 and the right short side 22 forms a fourth sub-region 26. Taking the first sub-region 23 as an example, when the left short side 21 is subjected to an impact force such as a hard object, the impact force can be quickly transmitted along the left short side 21 and each connecting structure 500 to the long side or the connecting structure 500 corresponding to the left crossbeam 11b1. The force transmission path is short and the lever arm is short, thereby achieving rapid dispersion of the impact force, which can greatly improve the rigidity of the battery pack 20 (the mode of the battery pack 20 can reach above 80HZ). Similarly, the connecting force formed in the first sub-region 23 can also be quickly dispersed through the left short side 21, the long side, and the connecting structure 500.

[0125] In some embodiments, a mounting hole 11c is provided on the frame 11 at a position corresponding to the connection structure 500. The mounting hole 11c can be a threaded hole. When assembling the frame 11 and the battery pack 20, fasteners such as bolts can be used to install the battery pack 20 onto the frame 11.

[0126] Figure 4 shows an exploded view of a battery pack according to an embodiment of the present application; Figure 5 shows a structural schematic diagram of a top cover assembly according to an embodiment of the present application; Figure 6 shows a structural schematic diagram of a top cover assembly from another angle according to an embodiment of the present application; Figure 7 shows an exploded view of a top cover assembly according to an embodiment of the present application.

[0127] In the embodiments of this application, please refer to Figures 4 to 7. The battery pack 20 in the embodiments of this application includes an upper cover assembly 100, a lower frame 200, and a cell unit 300.

[0128] The battery cell unit 300 can be formed by connecting multiple battery cells 310, and the multiple battery cells 310 in the same battery cell unit 300 can be arranged side by side.

[0129] The cover assembly 100 is the structural component described above. The cover assembly 100 has excellent strength, rigidity and installability. The cover assembly 100 is configured to be connected to the vehicle frame 11. The cover assembly 100 has a force transmission structure 400 formed from its interior to the edge of the cover assembly 100.

[0130] After the battery pack 20 is connected to the frame 11, the upper cover assembly 100 is connected to the frame 11, and the lower frame 200 is located below the upper cover assembly. The upper cover assembly 100 can serve as the upper cover structure of the battery pack 20.

[0131] It should be noted that the force transmission structure 400 has the function of transmitting force. The connection force between the vehicle and the battery pack 20, as well as the connection force and impact force when the battery pack 20 is subjected to external impact force, can be transmitted along the force transmission structure 400.

[0132] The force transmission structure 400 here forms from the inside of the top cover assembly 100 to the edge of the top cover assembly 100. As mentioned above, the inside of the top cover assembly 100 is a structure located between the left short side 21 and the right short side 22 corresponding to the battery pack 20. This part of the structure is provided with a connection structure 500 corresponding to the cross beam 11b. The edge of the top cover assembly 100 is located in a structure corresponding to the long side or short side of the battery pack 20. This part of the structure is provided with a connection structure 500 corresponding to the main beam 11a. Therefore, by setting the force transmission structure 400 to form from the inside of the top cover assembly 100 to the edge, the connection force and impact force of the internal region of the top cover assembly 100 can be transmitted from the inside and distributed to the edge of the top cover assembly 100 and the frame 11. The connection force and impact force can also be transmitted in the opposite direction, so that the top cover assembly 100 has excellent structural strength and stiffness from its inside to its edge. After the top cover assembly 100 is forcefully connected to the frame 11, excellent connection strength and stiffness can also be formed between the frame 11 and the battery pack 20.

[0133] In the embodiments of this application, in order to enable the upper cover assembly 100 to form the force transmission structure 400 from its interior to its edge, the force transmission structure 400 can be formed on the outside of the upper cover assembly 100, or on the inside of the upper cover assembly 100, or the force transmission structure 400 can be formed on both the outside and the inside of the upper cover assembly 100. The above three ways of forming the force transmission structure 400 will be described in detail in the following embodiments.

[0134] In addition, the force transmission structure 400 can be other structures disposed on the upper cover assembly 100, or the force transmission structure 400 can be formed by the structure of the upper cover assembly 100 itself. The following embodiments will also elaborate on these two ways of forming the force transmission structure 400.

[0135] The lower frame 200 is sealed to the upper cover assembly 100 and forms a receiving cavity 27 (see reference 9). The battery cell 310 can be disposed in the receiving cavity 27, and at least a portion of the battery cell 310 is connected to the upper cover assembly 100.

[0136] The battery pack 20 adopts a sealed connection between the upper cover assembly 100 and the lower frame 200, which allows the battery pack 20 to be sealed as a whole before it is connected to the frame 11, forming an independent and stable battery pack 20 structure, which helps to simplify the assembly of the battery pack 20 and achieve effective sealing.

[0137] At least some of the battery cells 310 are connected to the upper cover assembly 100. The lower frame 200 only needs to support the weight of some of the battery cells 310, or even does not need to support the weight. The lower frame 200 can be designed to be lightweight, which further improves the energy density of the battery pack 20.

[0138] This application does not limit the specific type of the battery cell 310. In some embodiments, the battery cell 310 can be a blade battery. In addition, the battery cell 310 can be placed independently in the receiving cavity 27, or multiple battery cells 310 can be arranged in the receiving cavity 27 in the form of a battery cell unit 300.

[0139] As can be seen from the following embodiments, the main function of the lower frame 200 in this application embodiment is to form a seal with the upper cover assembly 100, thereby achieving the overall sealing of the battery pack 20. The lower frame 200 can also integrate other structural components of the battery pack 20, such as the cold plate 210, the distribution box 220, etc., which can be integrated into the lower frame 200.

[0140] To achieve a seal between the upper cover assembly 100 and the lower frame 200, bolts or other connecting parts can be installed at the edges of the upper cover assembly 100 and the lower frame 200, and a sealing ring can be used to achieve a seal. Alternatively, welding can be used to form a full-circle weld to ensure the sealing effect between the upper cover assembly 100 and the lower frame 200.

[0141] In addition, an insulating structure can be provided between the upper cover assembly 100 and the lower frame 200 to achieve insulation between the two. The insulating structure can be insulating tape located between the two, or a separator structure made of insulating material. Alternatively, an insulating film such as a PI film can be attached to the end of the cell 310, which can not only achieve insulation performance, but also isolate heat transfer between the cells 310, thereby improving the safety performance of the battery pack 20.

[0142] The battery pack 20 in this embodiment is based on the force transmission structure 400 on the upper cover assembly 100. The force transmission structure 400 gives the upper cover assembly 100 excellent structural strength and rigidity from its interior to its edge. The strength and rigidity of the upper cover assembly 100 are sufficient to support the connection between the upper cover assembly 100 and the frame 11, the connection between the upper cover assembly 100 and the lower frame 200, and the connection between the upper cover assembly 100 and the cell unit 300. This eliminates the need for structures such as the intermediate crossbeam 411 in conventional technologies in the battery pack 20, providing more space for the cell unit 300. The cell unit 300 can fill the internal space of the battery pack 20, thereby improving the space utilization of the cell unit 300 and thus increasing the capacity of the battery pack 20.

[0143] Furthermore, the sealing design of the lower frame 200 and the upper cover assembly 100 can improve the overall integrity of the battery pack 20, so that the battery pack 20 can form an independent and stable structure before being connected to the vehicle. The battery pack 20 can be sealed before being installed on the frame 11, which can reduce the installation difficulty of the battery pack 20 and can also complete the sealing work of the battery pack 20 before it is installed on the vehicle, which can simplify the sealing structure and improve the sealing performance.

[0144] In some embodiments, referring to Figures 5 and 7, the cover assembly 100 includes a substrate assembly 110, and the force transmission structure 400 includes a first force transmission structure 410 connected to one side of the substrate assembly 110.

[0145] As one of the force transmission structures 400, the first force transmission structure 410, as described above, is formed on the outside of the upper cover assembly 100 and adopts other structural forms. The first force transmission structure 410 can improve the strength and rigidity of the substrate assembly 110.

[0146] The substrate assembly 110 can be designed in a generally cuboid structure, corresponding to the cuboid battery pack 20. The first force transmission structure 410 can be formed on the side of the upper cover assembly 100 away from the lower frame 200. This can improve the strength and rigidity of the upper cover assembly 100 while avoiding occupying the internal space of the battery pack 20.

[0147] In some embodiments, referring to Figures 5 and 7, the first force transmission structure 410 includes a plurality of crossbeams 411 arranged along the width direction of the upper cover assembly 100, the plurality of crossbeams 411 being spaced apart and arranged in parallel on the substrate assembly 110.

[0148] The number of crossbeams 411 can be set according to the number of crossbeams 11b. For example, in the examples shown in Figures 1 and 3, the frame 11 includes three crossbeams 11b, and correspondingly, the first force transmission structure 410 can also be provided with three crossbeams 411, with the positions of the crossbeams 411 corresponding to those of the crossbeams 11b. In other embodiments, the number of crossbeams 411 can also be changed accordingly when the number of crossbeams 11b changes.

[0149] As shown in Figure 5, the crossbeam 411 can establish a force transmission channel between the two sides of the substrate assembly 110 in the Y direction. When one side (the long side of the substrate assembly 110) is subjected to the aforementioned connecting force and impact force, the connecting force and impact force can be transmitted along the crossbeam 411 to the other side of the substrate assembly 110, thereby improving the strength and rigidity of the substrate assembly 110.

[0150] It is understandable that the spacing between the crossbeams 411 can be designed to match the spacing between the crossbeams 11b. Taking three crossbeams 411 as an example, the crossbeam 411 corresponding to the middle beam 11b2 can be set at approximately the middle position of the substrate assembly 110, and the other two crossbeams 411 can be set as the crossbeams 411 corresponding to the middle beam 11b2. The two can be symmetrically distributed on both sides of the crossbeam 411 corresponding to the middle beam 11b2, or they can be arranged in an asymmetrical manner.

[0151] In some embodiments, referring to Figure 5, the crossbeam 411 is a solid structure, which can improve the strength of the substrate assembly 110.

[0152] In some embodiments, the crossbeam 411 is designed to have a first cavity 4111, so that when the substrate assembly 110 is subjected to a force, the crossbeam 411 with the first cavity 4111 can provide a certain elastic support for the substrate assembly 110. When the substrate assembly 110 is subjected to the aforementioned force, the substrate assembly 110 can better transmit the force, and can also buffer or weaken the force, thereby enabling the crossbeam 411 with the first cavity 4111 to enhance the rigidity of the substrate assembly 110.

[0153] In some embodiments, referring to Figures 5 and 7, the crossbeam 411 may employ a combination of solid and hollow structures, enabling the substrate assembly 110 to achieve a balance between strength and stiffness.

[0154] To form the first cavity 4111, the crossbeam 411 may include a third support portion 1323 and a protrusion 4113. The third support portion 1323 is connected to the substrate assembly 110, and the protrusion 4113 is connected to the third support portion 1323 to form the first cavity 4111.

[0155] The crossbeam 411 has an overall arched structure and is located on the side of the upper cover assembly 100 away from the lower frame 200. The protrusion 4113 protrudes from the surface of the upper cover assembly 100 to form a first cavity 4111. The third support 1323 extends outward from the edge of the protrusion 4113. The third support 1323 can increase the contact area between the crossbeam 411 and the substrate assembly 110, thereby improving the connection strength between the two.

[0156] The specific structure of the third support portion 1323 is not limited. For example, in the example shown in Figure 5, the third support portion 1323 can be a planar structure. In other embodiments, the third support portion 1323 can also be designed as an arc-shaped structure, a wave-shaped structure, etc., and even a lateral structure that can realize the lateral transmission of force can be provided on the third support portion 1323. The lateral structure can be arranged perpendicular to the third support portion 1323.

[0157] The specific structure of the protrusion 4113 is not limited. For example, in the example shown in Figure 5, the cross-section of the protrusion 4113 is rectangular. In other embodiments, the protrusion 4113 can also be designed as an arc-shaped structure or a wave-shaped structure. For example, the sidewall of the protrusion 4113 can be bent.

[0158] In some embodiments, referring to FIG5, the protrusion 4113 has openings at both ends, and the crossbeam 411 also includes an end plate 4114, which is obliquely disposed at the opening.

[0159] The crossbeam 411 is arranged on the substrate assembly 110 along the Y direction. The crossbeam 411 has openings at both ends in the X direction. By setting inclined end plates 4114 at the openings, the aforementioned force can be transmitted to the substrate assembly 110 along the end plates 4114, thereby improving the overall strength and rigidity of the cover assembly 100.

[0160] Understandably, the end plate 4114, which is inclined at the opening, can extend the path from the crossbeam 411 to the substrate, thereby extending the path of force transmission from the crossbeam 411 to the substrate assembly 110. This can create a buffer transition between the crossbeam 411 and the substrate assembly 110, avoiding damage to the connection performance between the crossbeam 411 and the substrate assembly 110 caused by excessive force and instantaneous transmission to the substrate assembly 110. For example, it can prevent the crossbeam 411 from detaching from the substrate assembly 110.

[0161] In some embodiments, the end plate 4114 may be a hollow structure or a solid structure, and an inclined structure that enables the inclined transmission of force may be provided on the end plate 4114.

[0162] Of course, in other embodiments, the crossbeam 411 may also have openings at both ends, that is, the end plates 4114 may not be provided at both ends of the crossbeam 411. Alternatively, the end plate 4114 may be provided only at one end of the crossbeam 411.

[0163] Figure 8 shows a partial cross-sectional view along the AA direction in Figure 6.

[0164] In some embodiments, referring to Figures 7 and 8, at least a portion of the edge of the cover assembly 100 is formed with a second cavity 101, which forms a second force transmission structure 420.

[0165] As one of the force transmission structures 400, the second force transmission structure 420, as described above, is formed on the inner side of the upper cover assembly 100 and adopts its own structure. The second force transmission structure 420 can improve the strength and rigidity of the substrate assembly 110.

[0166] It is understandable that when the side of the cover assembly 100 is subjected to the aforementioned force, the second cavity 101 provides elastic support, allowing the cover assembly 100 to better transmit the force and buffer or weaken it. The reduced force is then transmitted to other parts of the cover assembly 100, resulting in better strength and rigidity for the cover assembly 100 with the second cavity 101. When the cover assembly 100 is subjected to the aforementioned force, as the force is transmitted from the inside to the edge, the second cavity 101 allows for better transmission, buffering or weakening the force.

[0167] The second cavity 101 can be formed circumferentially on the edge of the cover assembly 100. The second cavity 101 can also be selectively provided at certain locations of the cover assembly 100. For example, the second cavity 101 can be provided at the location corresponding to the crossbeam 411. Of course, the second cavity 101 can also be provided at other locations of the cover assembly 100.

[0168] In some embodiments, please refer to FIG7 and FIG8, the substrate assembly 110 includes a first substrate 111 and a second substrate 112. The second substrate 112 is connected to the first substrate 111 and forms a second cavity 101. The aforementioned crossbeam 411 can be connected to the second substrate 112.

[0169] Here, the substrate assembly 110 is designed to include a first substrate 111 and a second substrate 112. Then, the second cavity 101 can be formed by the cooperation between the first substrate 111 and the second substrate 112. The structure is simple and the formation of the second cavity 101 can be simplified.

[0170] It is understood that the substrate assembly 110 with the above-described split structure needs to form a seal between the first substrate 111 and the second substrate 112. Therefore, a first sealing element 120 can be provided between the first substrate 111 and the second substrate 112. This first sealing element 120 can be made of materials such as rubber or silicone, and can be arranged in multiple turns around the first substrate 111 and the second substrate 112, thereby improving the seal between the first substrate 111 and the second substrate 112. In other embodiments, in addition to providing the first sealing element 120 between the first substrate 111 and the second substrate 112, a related sealing structure can also be provided between the first substrate 111 and the second substrate 112 to achieve a seal. For example, the first substrate 111 and the second substrate 112 can be designed to be nested or interlocked with each other. In this case, combining this with the first sealing element 120 can further improve the sealing effect.

[0171] In addition, the specific shape of the first sealing element 120 can be set according to the different shapes of the second substrate 112. In general, the first sealing element 120 can be set to a structure corresponding to the second substrate 112. Thus, the first sealing element 120 can be arranged according to the structure of the second substrate 112, which is highly targeted and can save the use of the first sealing element 120 or simplify the arrangement of the first sealing element 120.

[0172] In some embodiments, please refer to FIG5, the crossbeam 411 divides the area where the substrate assembly 110 is located into several first regions 110a, and the second substrate 112 includes multiple region structures 1121, each region structure 1121 forming a second region 112a corresponding to the first region 110a.

[0173] Based on the foregoing, it can be understood that the first region 110a can be understood as the sub-region mentioned above. The second substrate 112 forms multiple region structures 1121 according to the number and arrangement of the first regions 110a. Each region structure 1121 forms a second region 112a corresponding to the first region 110a. Each region structure 1121 can strengthen the corresponding first region 110a.

[0174] As described above, the first region 110a corresponds to the crossbeam 11b and the main beam 11a in the frame 11. The connection force between the vehicle and the battery pack 20 is mainly formed between the battery pack 20 and the crossbeam 11b or between the battery pack 20 and the main beam 11a. By setting the region structure 1121 for the first region 110a, the force can be transmitted and dispersed in a targeted manner at the location of the crossbeam 11b and the main beam 11a, which is beneficial to improving the strength and rigidity of the top cover assembly 100.

[0175] In conjunction with the above-mentioned first sealing member 120, the first sealing member 120 can be extended corresponding to the region structure 1121. That is, according to the second region 112a formed by the region structure 1121, the first sealing member 120 can be disposed between the first substrate 111 and the second substrate 112, and the first sealing member 120 can form a third region 120a corresponding to the second region 112a.

[0176] The first region 110a, the second region 112a and the third region 120a mentioned above are all designed based on the frame 11. It is understood that when the structural form of the frame 11 changes, the structural form and arrangement of the crossbeam 411, the second base plate 112 and the first seal 120 can also change.

[0177] In some embodiments, referring to FIG7, the second substrate 112 includes an edge structure portion 1122 and an intermediate structure portion 1123. The edge structure portion 1122 is disposed circumferentially, and the intermediate structure portion 1123 is disposed inside the edge structure portion 1122 to divide the edge structure portion 1122 into a plurality of second regions 112a. A region structure 1121 is formed around the edge structure portion 1122 and the intermediate structure portion 1123 of the second regions 112a.

[0178] The edge structure 1122 corresponds to the edge portion of the frame 11. For example, the edge structure 1122 can correspond to the main beam 11a of the frame 11. The middle structure 1123 corresponds to the middle portion of the frame 11. For example, the middle structure can correspond to the cross beam 11b of the frame 11. After the battery pack 20 is installed on the frame 11, the second substrate 112 is located between the first substrate 111 and the frame 11. The design of the second substrate 112, including the edge structure 1122 and the middle structure 1123, can adapt to the force transmission between the frame 11 and the battery pack 20. It can meet the strength and rigidity requirements of the top cover assembly 100 while saving the material of the second substrate 112 and simplifying the manufacturing process and cost of the second substrate 112.

[0179] It is understood that the above-described structure of the second substrate 112 is only an example. In other embodiments, the second substrate 112 may also be designed to include other structures. For example, the second substrate 112 itself may have a cavity or other structure, which may also play the role of transmitting force.

[0180] In addition, in other embodiments, the substrate assembly 110 may form a three-layer structure or other structures, in addition to the two-layer structure formed by the first substrate 111 and the second substrate 112. When the substrate assembly 110 forms a three-layer structure, the substrate assembly 110 may include a third substrate, etc.

[0181] Alternatively, the second cavity 101 can be formed in the substrate assembly 110 by integral molding, for example, the substrate assembly 110 including the second cavity 101 can be manufactured by injection molding.

[0182] In some embodiments, referring to Figures 5 to 8, a first recessed region 1111 is formed at the edge of the first substrate 111, and / or a second recessed region 1124 is formed at the edge of the second substrate 112.

[0183] In specific design, the first recessed region 1111 can be formed only at the edge of the first substrate 111, or the second recessed region 1124 can be formed only at the edge of the second substrate 112. Of course, the first recessed region 1111 and the second recessed region 1124 can also be provided simultaneously. When the second substrate 112 is connected to the first substrate 111, due to the presence of the first recessed region 1111 or the second recessed region 1124, the second cavity 101 mentioned above can be formed at the edges of the first substrate 111 and the second substrate 112.

[0184] To form the first recessed region 1111 and the second recessed region 1124, the first substrate 111 and the second substrate 112 can both be formed by stamping, which is simple, efficient and low cost. The first substrate 111 and the second substrate 112 can be made of 90DP or higher strength steel, and the thickness can be 0.6mm to 1mm. The two are then connected together by the first sealing member 120 and welding.

[0185] In some embodiments, referring to Figures 5 to 8, the first substrate 111 includes a first substrate body 1112 and a first extension 1113. The first extension 1113 bends outward from the edge of the first substrate body 1112 and forms a first recessed region 1111. And / or, the second substrate 112 includes a second substrate body 1125 and a second extension 1126. The second extension 1126 bends outward from the edge of the second substrate body 1125 and forms two recessed regions.

[0186] To ensure the connection strength between the first substrate 111 and the second substrate 112 and to simplify manufacturing, taking the first substrate 111 as an example, the first substrate 111 can be designed to include a flat portion and a curved portion. The flat portion can form a large-area contact with the flat portion on the second substrate 112, thereby ensuring connection strength. The curved portion can form the aforementioned first recessed area 1111. The first substrate body 1112 forms the aforementioned flat portion, and the first extension 1113 can form the curved portion. When designing the first substrate 111, the flat plate can be stamped at the edge of the plate. After forming the aforementioned first extension 1113 at the edge of the plate, the first substrate 111 can be formed. The structure and manufacturing method of the second substrate 112 are similar to those of the first substrate 111, and will not be described in detail here.

[0187] As can be seen from the following embodiments, the side of the upper cover assembly 100 facing the lower frame 200 can be connected to the battery cell unit 300, that is, the battery cell unit 300 is disposed on the side of the upper cover assembly 100 facing the lower frame 200. In order to provide space for the battery cell unit 300 and control the shape of the battery pack 20, the first extension 1113 can be bent towards the side facing the lower frame 200, thereby wrapping the battery cell unit 300 within the wrapping space formed by the first extension 1113 and the first substrate body 1112. In order to achieve cooperation with the first substrate 111, the second extension 1126 of the second substrate 112 can also be bent towards the side facing the lower frame 200, so that the first substrate 111 and the second substrate 112 are more tightly connected.

[0188] In the embodiment provided with the first extension 1113 and the second extension 1126, it should be understood that the first extension 1113 can be formed by one bend or by multiple bends, and the second extension 1126 can be formed by one bend or by multiple bends. Therefore, the first extension 1113 and the second extension 1126 can be a second cavity 101 that extends circumferentially along the upper cover assembly 100 and has a single-ring structure, or it can be a second cavity 101 with a multi-ring structure.

[0189] In some embodiments, referring to FIG8, the first substrate body 1112 and the first extension 1113 can be connected by an inclined arm 113, and the second substrate body 1125 and the second extension 1126 can be connected by an inclined arm 113. The inclined arm 113 can alleviate or weaken the transmission of force, thereby improving the strength and rigidity of the first substrate 111 or the second substrate 112.

[0190] In some embodiments, an expansion filler may be provided in the second cavity 101. The expansion filler may be a material that can expand, such as foam. By filling the second cavity 101 with an expansion filler, the strength and rigidity of the cover assembly 100 can be improved.

[0191] The expansion filler, combined with the welding method of the first seal 120 mentioned above, can ensure the strength and rigidity of the connection between the first substrate 111 and the second substrate 112 to form the substrate assembly 110.

[0192] In conjunction with the foregoing, in some embodiments, referring to Figures 9 to 11, the battery pack 20 further includes a connecting structure 500. This connecting structure 500 is disposed at the edge of the upper cover assembly 100, forming a mounting channel 501. This mounting channel 501 can mate with the aforementioned mounting holes 11c on the frame 11, thereby enabling the upper cover assembly 100 to be mounted onto the frame 11 using bolts or other fasteners. It is understood that the connecting structure 500 can be a first connecting structure 510, or a combination of the first connecting structure 510 and the second connecting structure 520.

[0193] The connecting structure 500 is located at the edge of the upper cover assembly 100. Combined with the second cavity 101 formed at the edge of the upper cover assembly 100, the second cavity 101 can form the peripheral structure of the connecting structure 500. As a force transmission structure 400, the second cavity 101 can transmit the connecting force at the connecting structure 500 to other parts or weaken the connecting force. The combination of the connecting structure 500 and the second cavity 101 can improve the strength and rigidity of the upper cover assembly 100. After the upper cover assembly 100 is connected to the frame 11, the frame 11 and the upper cover assembly 100 can also meet the strength and rigidity requirements.

[0194] It should be understood that the connection structure 500 located on the edge of the cover assembly 100 needs to be interpreted according to the specific location of the second cavity 101. As mentioned above, the second cavity 101 can be formed circumferentially on the edge of the cover assembly 100, or it can be formed at a certain location on the cover assembly 100. Therefore, when the connection structure 500 is located at the location where the second cavity 101 is formed, the connection structure 500 and the corresponding second cavity 101 can form the above-mentioned combination relationship. When the location where the connection structure 500 is located does not have a second cavity 101, the combination of the connection structure 500 and the cover assembly 100 mainly serves to strengthen the structural strength of the cover assembly 100. Of course, in other embodiments, to meet the stiffness requirements of force transmission, a force transmission structure 400 can also be provided on the cover assembly 100 corresponding to the connection structure 500, such as the first force transmission structure 410 mentioned above.

[0195] For ease of description, the connecting structure 500 disposed in the second cavity 101 is defined as the first connecting structure 510, and the connecting structure 500 disposed in the upper cover assembly 100 where the second cavity 101 is not formed is defined as the second connecting structure 520. As mentioned above, it can be understood that the combination of the first connecting structure 510 and the second cavity 101 can improve the strength, rigidity and installability of the upper cover assembly 100, and the combination of the second connecting structure 520 and the upper cover assembly 100 can improve the strength of the upper cover assembly 100. In addition, in combination with the setting of other force transmission structures 400, the combination of the second connecting structure 520 and the upper cover assembly 100 can meet the requirements of strength and rigidity.

[0196] In the embodiments of this application, as described above, it should be understood that the number and arrangement of the first connecting structure 510 and the second connecting structure 520 can be selected according to actual needs. For example, in some cases, the first connecting structure 510 can be used and arranged in a circle along the circumference of the upper cover assembly 100. Alternatively, in some cases, the first connecting structure 510 and the second connecting structure 520 can be arranged alternately along the circumference of the upper cover assembly 100. Based on the above embodiments, in embodiments where a first force transmission structure 410 formed by a crossbeam 411 is provided, the first connecting structure 510 and the second connecting structure 520 can also be arranged according to the position of the crossbeam 411.

[0197] In some embodiments, please refer to FIG5, the first connecting structure 510 is correspondingly disposed at the end of the crossbeam 411.

[0198] As described above, the function of the crossbeam 411 is to connect with the crossbeam 11b on the frame 11. As the part of the cover assembly 100 that needs to connect with the frame 11, and since the crossbeam 411 is located inside the cover assembly 100, the stress concentration effect on the crossbeam 411 is relatively significant. In order to alleviate the stress, in addition to adopting the hollow structure and other structural designs described above, the first connecting structure 510 can also be correspondingly set at the end of the crossbeam 411. This allows the combination of the first connecting structure 510 and the second cavity 101 to function in relation to the crossbeam 411 during the transmission of connecting force and impact force. This allows the force transmitted along the crossbeam 411 to be quickly dispersed or weakened when it is transmitted to the first connecting structure 510 and the second cavity 101, thereby improving the strength, rigidity and installability of the cover assembly 100 from the crossbeam 411 to the edge.

[0199] Understandably, since the crossbeam 411 primarily serves to connect with the frame 11, a second connecting structure 520 can be installed on the crossbeam 411 to ensure connection strength. Alternatively, a first connecting structure 510 can also be installed on the crossbeam 411.

[0200] Figure 9 shows a cross-sectional view of a battery pack according to an embodiment of this application; Figure 10 shows a partial enlarged view of part B in Figure 9.

[0201] In some embodiments, please refer to Figures 9 and 10. The first connection structure 510 includes a lug assembly 511 that passes through the second cavity 101. The lug assembly 511 has a port 511a and forms an installation channel 501. The outer wall surface of the lug assembly 511 is connected to the first substrate 111 and the second substrate 112.

[0202] The port 511a is formed on the end of the lug assembly 511 corresponding to the frame 11. The mounting channel 501 can be connected to the mounting hole 11c on the frame 11. After bolts and other fasteners are sequentially inserted into the mounting channel 501 and the mounting hole 11c, the connection between the cover assembly 100 and the frame 11 can be achieved.

[0203] The lug assembly 511 can be connected to the first substrate 111 and the second substrate 112 by welding. In the design, a welding opening 1114 that can accommodate the lug assembly 511 can be formed on the first substrate 111 and the second substrate 112. Before welding, the lug assembly 511 can be installed at the welding opening 1114 and the outer wall of the lug assembly 511 can be made to abut against the edges of the first substrate 111 and the second substrate 112. Then, the connection between the lug assembly 511 and the top cover assembly 100 can be achieved by laser welding.

[0204] To ensure reliable connection and prevent the lug assembly 511 from detaching from the cover assembly 100, a limiting structure can be formed between the lug assembly 511 and the cover assembly 100.

[0205] For example, referring to FIG10, in some embodiments, the lug assembly 511 may include a lug 5111, a first step 5111a is formed at the position of the lug 5111 corresponding to the first substrate 111, and a second step 5111b is formed at the position of the lug 5111 corresponding to the second substrate 112.

[0206] The first step 5111a can be engaged with the edge of the welding opening 1114 on the first substrate 111. The first step 5111a can limit the lifting lug 5111 below, preventing the lifting lug 5111 from passing through the welding opening 1114 on the first substrate 111. The second step 5111b can limit the lifting lug 5111 above, preventing the lifting lug 5111 from passing through the welding opening 1114 on the second substrate 112.

[0207] In some embodiments, referring to FIG10, the lug 5111 includes a first connecting segment 5111c, a second connecting segment 5111d, and a third connecting segment 5111e. The first connecting segment 5111c corresponds to the first substrate 111 and forms a first step 5111a. The second connecting segment 5111d corresponds to the second substrate 112 and forms a second step 5111b. The third connecting segment 5111e is connected between the first connecting segment 5111c and the second connecting segment 5111d. The outer diameter of the first connecting segment 5111c is larger than the outer diameter of the second connecting segment 5111d. At least a portion of the outer wall surface of the third connecting segment 5111e is inclined.

[0208] Therefore, the lifting lug 5111 has a stepped structure in shape. The first connecting segment 5111c can extend out of the welding opening 1114 to form the port 511a of the lifting lug assembly 511. The first connecting segment 5111c can transition to the second connecting segment 5111d through the inclined third connecting segment 5111e. The third connecting segment 5111e and the second connecting segment 5111d have an outward expansion structure relative to the first connecting segment 5111c. The third connecting segment 5111e and the first connecting segment 5111c can be restricted between the first substrate 111 and the second substrate 112 by means of the limiting effect of the first step 5111a and the second step 5111b, thereby improving the connection strength between the upper cover assembly 100 and the lifting lug 5111.

[0209] In the above structure, at least part of the outer wall surface of the third connecting segment 5111e is inclined, which can prolong the transmission time of the above force between the lug 5111 and the upper cover assembly 100, thereby reducing the impact of the force on the upper cover assembly 100 and the lug 5111.

[0210] In some embodiments, referring to FIG10, the lug assembly 511 further includes a bushing 5112 disposed within the mounting channel 501. The bushing 5112 extends from one side of the first substrate 111 and has a bushing cavity 5112a communicating with the mounting channel 501. A gap is formed between the bushing 5112 and the first substrate 111, and a portion of the lower frame 200 can be confined within the gap.

[0211] As described above, the lower frame 200 serves to form a seal with the upper cover assembly 100. In a specific design, a seal can be formed between the first substrate 111 and the lower frame 200. The bushing 5112 extends from one side of the first substrate 111, extending the length of the mounting channel 501. This facilitates the insertion of fasteners such as bolts through the bushing cavity 5112a into the mounting channel 501, simplifying the bolt connection process. Furthermore, by creating a gap between the bushing 5112 extending from the first substrate 111 and the first substrate 111, the lower frame 200 is confined within this gap. This enhances the connection strength and reliability between the lower frame 200 and the upper cover assembly 100, allowing for a more compact structure in the battery pack 20.

[0212] To form the aforementioned gap, a flange 5112b can be provided on the outer wall of the bushing 5112, which can form the aforementioned gap with the first substrate 111.

[0213] In some embodiments, referring to FIG10, the lug assembly 511 further includes a sealing plug 5113, which is sealed within the bushing cavity 5112a.

[0214] The function of the sealing plug 5113 is to seal the mounting channel 501, so that after the top cover assembly 100 or battery pack 20 is connected to the frame 11 by bolts, the sealing plug 5113 can protect the internal environment of the mounting channel 501, for example, it can prevent dust, moisture and other substances from entering the mounting channel 501.

[0215] Based on the above, it can be seen that the lug 5111 has a port 511a. The lug 5111 needs to be connected to the frame 11. In order to ensure the connection effect and to form a seal between the frame 11 and the lug 5111, a second sealing element 5114 can be provided between the lug 5111 and the frame 11. Please refer to Figure 10. The second sealing element 5114 can be an O-ring or similar made of silicone.

[0216] For the lifting lug 5111 and bushing 5112, as well as the bushing 5112 and sealing plug 5113, sealing structures can be provided separately to improve the sealing effect. For example, a third sealing element 5115 can be provided between the lifting lug 5111 and bushing 5112, and a fourth sealing element 5116 can be provided between the bushing 5112 and sealing plug 5113. These sealing structures can be O-rings or H-rings, etc., and this application does not limit them.

[0217] In some embodiments, referring to FIG10, the first connection structure 510 has an outer side facing the edge of the cover assembly 100 and an inner side away from the edge of the cover assembly 100. A reinforcing structure 114 is filled between the first substrate 111 and the second substrate 112. The reinforcing structure 114 is located on the outer side of the first connection structure 510, or the reinforcing structure 114 is located on both the inner and outer sides of the first connection structure 510.

[0218] It is understandable that, for the first connecting structure 510, after it is assembled into the second cavity 101, the first connecting structure 510 is surrounded by the second cavity 101. In order to improve the structural strength of the first connecting structure 510 and its surroundings, a reinforcing structure 114 can be provided on the inner side, or on both the inner and outer sides at the same time. The addition of the reinforcing structure 114 can prevent the first connecting structure 510 or the upper cover assembly 100 corresponding to the first connecting structure 510 from deforming due to excessive force.

[0219] In some specific embodiments, the reinforcing structure 114 can be formed by potting glue on the inner and outer sides. For the inner side, the glue can be potted before the first connecting structure 510 is connected to the upper cover assembly 100. For the outer side, the glue can be potted after the first connecting structure 510 is connected to the upper cover assembly 100.

[0220] In some embodiments, referring to FIG5, the first substrate 111 and the second substrate 112 are attached to each other at both ends in the length direction, or the second substrate 112 is recessed inward along the length direction of the first substrate 111, so as to form at least one single-layer structure portion not covered by the second substrate 112 at the end of the first substrate 111.

[0221] The length direction here can be understood as the X direction in Figure 5. Here, the second connecting structure 520 is set at both ends of the upper cover assembly 100 along the length direction, which can strengthen the structural strength of the upper cover assembly 100 at the ends. The fitting setting and the single-layer structure part here are both positions in the upper cover assembly 100 where the second cavity 101 is not formed.

[0222] In the above embodiments of the first connecting structure 510 and the second connecting structure 520, it should be understood that the first connecting structure 510 and the second connecting structure 520 may adopt the same structure, that is, both may include lugs 5111, bushings 5112, etc. In some embodiments, the second connecting structure 520 may only be provided with lugs 5111, or the second connecting structure 520 may adopt a conventional lug 5111 structure.

[0223] In some embodiments, in order to achieve a seal between the battery pack 20 and the frame 11, a body sealing ring 600 can be provided on the side of the upper cover assembly 100 away from the lower frame 200. The body sealing ring 600 can be provided on the second substrate 112, for example. The body sealing ring 600 has a closed ring structure and can form a seal between the upper cover assembly 100 and the frame 11.

[0224] In some embodiments, please refer to Figures 5 and 7, a structural adhesive layer 700 is provided on the side of the upper cover assembly 100 facing the lower frame 200, and the battery cell unit 300 is connected to the structural adhesive layer 700.

[0225] The structural adhesive layer 700 enables the connection between the cell unit 300 and the upper cover assembly 100. The connection between the cell unit 300 and the upper cover assembly 100 can be a step in assembling the battery pack 20. This step can be performed as follows: the upper cover assembly 100 is placed on the assembly station with the side of the upper cover assembly 100 facing the lower frame 200 upwards; then, structural adhesive is evenly applied to the upper cover assembly 100 to form the structural adhesive layer 700; finally, the cell units 300 are connected to the structural adhesive layer 700 according to a specified arrangement.

[0226] Understandably, after completing the above procedures, the lower frame 200 can be connected to the upper cover assembly 100. After completing the sealed connection between the lower frame 200 and the upper cover assembly 100, the battery pack 20 can be formed. Then, the battery pack 20 can be rotated 180 degrees so that the upper cover assembly 100 of the battery pack 20 is above the lower frame 200. Then, the battery pack 20 can be installed on the vehicle frame 11 through the connecting structure 500 to complete the installation of the battery pack 20.

[0227] As can be seen from the aforementioned embodiments of the upper cover assembly 100, the force transmission structure 400 can be disposed on the outside of the upper cover assembly 100, or formed by the first substrate 111 and the second substrate 112. The part of the upper cover assembly 100 used for coating structural adhesive can be planar, thereby allowing precise control of the thickness of the structural adhesive layer 700 and achieving a balance in the thickness of the structural adhesive layer 700. This is beneficial for improving the connection reliability between each battery cell 300 and the structural adhesive layer 700 and achieving uniformity in the performance of each battery cell 300.

[0228] In some embodiments, please refer to FIG10, an adhesive groove 102 may also be provided on the top cover assembly 100, and at least a portion of the structural adhesive layer 700 may be embedded in the adhesive groove 102.

[0229] The adhesive groove 102 can increase the bonding force between the structural adhesive layer 700 and the cover assembly 100, thereby improving the connection stability between the structural adhesive layer 700 and the cover assembly 100.

[0230] In some embodiments, the adhesive groove 102 may be disposed around the outer periphery of the connecting structure 500. In this case, the adhesive groove 102 may serve as a third force transmission structure 430. The third force transmission structure 430 is formed by the upper cover assembly 100 itself, specifically by the first substrate 111. The third force transmission structure 430 can form a better force transmission effect around the connecting structure 500, thereby improving the strength and rigidity of the connecting structure 500 and its surroundings.

[0231] Figure 11 shows a schematic diagram of a first expansion limiting structure provided according to an embodiment of this application.

[0232] In some embodiments, please refer to Figures 6, 7 and 11. The top cover assembly 100 further includes a first expansion limiting structure 130 disposed on the substrate assembly 110, and the battery cell unit 300 is constrained between the first expansion limiting structures 130.

[0233] The first expansion limiting structure 130 can be set at both ends of the upper cover assembly 100 along its length. When the battery pack 20 is in charge-discharge cycle, the cell unit 300 will expand and contract to a certain extent. The first expansion limiting structure 130 can provide buffer space for the expansion of the cell unit 300 and prevent the cell unit 300 from expanding excessively.

[0234] In some embodiments, referring to FIG11, the first expansion limiting structure 130 includes an expansion beam 131 and a support leg 132. The expansion beam 131 abuts against the cell unit 300, and the support leg 132 supports the side of the expansion beam 131 away from the cell unit 300.

[0235] The expansion beam 131 is supported by the support bracket 132 to prevent it from tilting, thereby improving the limiting effect of the expansion beam 131 on the battery cell unit 300.

[0236] In some specific embodiments, referring to Figure 11, the expansion beam 131 includes an outer beam 1311 and an inner beam 1312. The outer beam 1311 is designed to have a third cavity 1311a, and the inner beam 1312 is disposed within the third cavity 1311a. The third cavity 1311a can form a fourth force transmission structure 440, which is located between the battery cell unit 300 and the substrate assembly 110. This fourth force transmission structure 440 can realize the force transmission between the substrate assembly 110 and the battery cell unit 300. While ensuring the limiting effect of the expansion beam 131 on the battery cell unit 300, it can also improve the strength and rigidity of the upper cover assembly 100. In addition, by providing the inner beam 1312 in the third cavity 1311a, the structural strength of the expansion beam 131 can be improved, preventing damage to the expansion beam 131.

[0237] In some specific embodiments, please refer to FIG11. The support bracket 132 includes a first support portion 1321, a second support portion 1322 and a third support portion 1323. The first support portion 1321 abuts against the expansion beam 131, the second support portion 1322 abuts against the substrate assembly 110, and the third support portion 1323 connects between the first support portion 1321 and the second support portion 1322. The third support portion 1323 forms a fourth cavity.

[0238] The first support portion 1321 and the second support portion 1322 can be arranged vertically. The first support portion 1321, the second support portion 1322, and the third support portion roughly form a triangular structure, which can provide good support for the expansion beam 131. By providing a fourth cavity on the third support portion 1323, this fourth cavity can serve as a fifth force transmission structure, realizing the transmission of force between the expansion beam 131 and the substrate assembly 110. The provision of this fourth cavity can improve the rigidity of the first expansion structure. Of course, for the first support portion 1321 and the second support portion 1322, a fifth cavity 1321a can be provided inside, and this fifth cavity 1321a can form a sixth force transmission structure.

[0239] Figure 12 shows a schematic diagram of a cold plate according to an embodiment of this application.

[0240] In some embodiments, referring to FIG12, in order to prevent the expansion beam 131 from deforming or shifting, the first expansion structure may also include a stop block 133, which may be disposed on the lower frame 200. After the lower frame 200 is connected to the upper cover assembly 100, the stop block 133 is located on the side of the expansion beam 131 away from the cell unit 300, and the stop block is used to restrict the expansion beam 131.

[0241] The stop block 133 can be set on one side of the support leg 132. The distance between the stop block 133 and the support leg 132 can be designed according to different needs. In addition, the number of stop blocks 133 can also be selected according to needs.

[0242] The stop block 133 can be a solid structure or a hollow structure. When it is a hollow structure, it can be designed similarly to the internal structure of the aforementioned expansion beam 131.

[0243] It should be noted that the stop 133 can abut against the expansion beam 131 or there can be a certain distance between the stop and the expansion beam 131, thereby providing a controllable and safe range for the deformation of the expansion beam 131.

[0244] In addition to the above, the stop 133 can also be provided on the upper cover assembly 100, or a portion of the stop 133 can be provided on the lower frame 200 and another portion of the stop 133 can be provided on the upper cover assembly 100.

[0245] The above embodiments provide a detailed description of the upper cover assembly 100 in the battery pack 20. It can be understood that the upper cover assembly 100, based on the setting of the force transmission structure 400 and the combined design of the connecting mechanism and the force transmission structure 400, can have excellent strength, rigidity and installability. Based on the design of the upper cover assembly 100, the battery pack 20 can use the upper cover assembly 100 as the main load-bearing component of the battery pack 20 and the third support part 1323 of the frame 11. Thus, the cell unit 300 and the lower frame 200 can be assembled onto the upper cover assembly 100, thereby achieving the effects of increased capacity, simplified assembly and simplified lower frame of the battery pack 20.

[0246] The above-described embodiments of the cover assembly 100 mainly describe the cover assembly 100 and the force transmission structure 400 from the perspective of local design of the force transmission structure 400. In other embodiments, the force transmission structure 400 may also be designed from an overall perspective.

[0247] For example, in some embodiments, the cover assembly 100 may be designed as a whole to include a cavity, in which crossbeams and longitudinal beams of force transmission may be arranged in a crisscross pattern. The crossbeams and longitudinal beams of force transmission enable the connection force and impact force to be transmitted along the crossbeams and longitudinal beams to various positions of the cover assembly 100 when a certain position of the cover assembly 100 is subjected to the aforementioned connection force and impact force, thereby meeting the requirements of the cover assembly 100 for strength, rigidity and installability.

[0248] In some embodiments, referring to FIG12, the lower frame 200 includes a cold plate 210, which is connected to the upper cover assembly 100 and forms a receiving cavity 27.

[0249] The function of the cold plate 210 is to dissipate heat for the cell unit 300. The cold plate 210 is provided with flow channels that can span between each cell unit 300.

[0250] In conjunction with the foregoing, in some embodiments, a first recessed receiving area is formed on the side of the top cover assembly 100 facing the battery cell 300. For example, in the embodiment where the top cover assembly 100 includes a first substrate 111 and a second substrate 112, and the second substrate 112 includes a second substrate body 1125 and a second extension 1126, the second substrate body 1125 and the second extension 1126 can form the first recessed receiving area, and the battery cell 300 can be wrapped by the first recessed receiving area. To adapt to the top cover assembly 100 with the above-described structural shape, the cold plate 210 forms a second recessed receiving area at a position corresponding to the first recessed receiving area.

[0251] In some embodiments, referring to FIG12, the cold plate 210 includes a heat spreader 211 and a flow channel plate 212, which are stacked on top of each other. The heat spreader 211 is close to the battery cell unit 300, and the heat from the battery cell unit 300 can be quickly transferred to the heat spreader 211. The flow channel plate 212 is provided with the aforementioned flow channels to dissipate heat. Both the heat spreader 211 and the flow channel plate 212 are designed as recessed structures that are recessed in the direction away from the upper cover assembly 100.

[0252] The recessed structure can be adapted to the top cover assembly 100, which can expand the internal space of the battery pack 20 and make the battery pack 20 more compact in structure.

[0253] In some embodiments, referring to FIG12, the edge of the heat spreader 211 is provided with a first edge 2111 in the circumferential direction, and the edge of the flow channel plate 212 is provided with a second edge 2121 in the circumferential direction. A first mounting portion 2112 for connecting with the upper cover assembly 100 is provided at intervals on the first edge 2111, and a second mounting portion 2122 for connecting with the upper cover assembly 100 is provided at intervals on the second edge 2121.

[0254] The first edge 2111 is the edge structure of the heat spreader 211. In a specific design, the edge of the heat spreader 211 can be formed into a flange, which forms the first edge 2111. The second edge 2121 is the edge structure of the flow channel plate 212. In a specific design, the edge of the flow channel plate 212 can be formed into a flange, which forms the second edge 2121. The contact area between the heat spreader 211 and the flow channel plate 212 can be increased through the cooperation of the first edge 2111 and the second edge 2121, thereby improving the integrity of the cold plate 210. In addition, when the cold plate 210 is connected to the upper cover assembly 100, the first mounting part 2112 and the second mounting part 2122 can be formed on the first edge 2111 and the second edge 2121, respectively. Overall, the edge of the cold plate 210 can form a large-area contact with the upper cover assembly 100, which is beneficial to improving the connection strength and reliability between the upper cover assembly 100 and the cold plate 210.

[0255] In conjunction with the foregoing, the first edge 2111 and the second edge 2121 can be confined between the bushing 5112 and the second substrate 112, thereby improving the tightness between the cold plates 210 of the top cover assembly 100, which is beneficial to the compact design of the battery pack 20.

[0256] In some specific embodiments, the first mounting portion 2112 and the second mounting portion 2122 can be designed as a structure such as a threaded hole.

[0257] In some embodiments, please refer to FIG12, a first reinforcing rib 2113 is provided on the inner side of the heat spreader 211, and a second reinforcing rib is provided on the inner side of the flow channel plate 212 corresponding to the position of the first reinforcing rib 2113. The structural strength of the cold plate 210 can be improved by the action of the first reinforcing rib 2113 and the second reinforcing rib.

[0258] In the specific design, the first reinforcing rib 2113 can be evenly arranged on the temperature equalization plate 211 along the circumference, and the second reinforcing rib can be evenly arranged on the flow channel plate 212 along the circumference.

[0259] In some embodiments, the heat spreader 211 is designed as a multi-layer structure, with adjacent layers made of different materials; the flow channel plate 212 is designed as a multi-layer structure, with adjacent layers made of different materials.

[0260] Using different materials to manufacture the heat spreader 211 and the flow channel plate 212 and forming a layered structure can improve the strength and rigidity of the heat spreader 211 and the flow channel plate 212. The combination of different materials and different layers is beneficial to the transmission and dispersion of forces.

[0261] This application does not limit the specific materials of the heat spreader 211 and the flow channel plate 212, nor does it limit the number of layers in the layered structure. For example, in some embodiments, the heat spreader 211 may have a three-layer structure and the flow channel plate 212 may have a four-layer structure. Alternatively, the material may be selected from high-strength aluminum.

[0262] The multi-layer structure of the temperature uniform plate 211 and the flow channel plate 212 can be formed by cold rolling of the sheet metal. For example, by reasonably selecting different sheet metals and arranging them in a stacked manner, the temperature uniform plate 211 and the flow channel plate 212 can be formed by a suitable cold rolling process.

[0263] To enhance the bonding strength between the heat spreader 211 and the flow channel plate 212, brazing layers and other structures can be set between different layers. The auxiliary brazing process can improve the structural strength of the heat spreader 211 and the flow channel plate 212.

[0264] In some embodiments, please refer to FIG12, a plug-in base 213 is provided on the cold plate 210, and the lower frame 200 also includes a power distribution box 220, which is disposed on the cold plate 210 and connected to the plug-in base 213.

[0265] It is understandable that the distribution box 220 is a component of the control system of the battery pack 20, and the battery management system (BMS) of the battery pack 20 can be set in the distribution box 220.

[0266] In some embodiments, a second expansion limiting structure may be provided on the cold plate 210, which abuts against the cell unit 300. Its structure and function can be referred to the aforementioned first expansion limiting structure 130, and will not be described again.

[0267] In some embodiments, referring to FIG2, the lower frame 200 further includes a protective plate 230, which is connected to the cold plate 210 and located on the side of the cold plate 210 away from the upper cover assembly 100.

[0268] The protective plate 230 is a protective structure for the battery pack 20. After the battery pack 20 is installed on the frame 11, the protective plate 230 is located at the bottom of the battery pack 20, which can prevent damage to the battery pack 20 caused by impacts from hard objects such as stones.

[0269] The protective plate 230 can be connected to the cold plate 210 by bolts or other fasteners, which can be arranged circumferentially on the edge of the protective plate 230.

[0270] To better understand the structure and performance of the battery pack 20 in this application embodiment, a portion of the embodiment will be further described below with reference to FIG2. In the embodiments described below, the battery pack 20 may include an upper cover assembly 100, a structural adhesive layer 700, a cell unit 300, a lower frame 200, and a connecting structure 500. The upper cover assembly 100 includes a substrate assembly 110 and a first force transmission structure 410 and a first expansion limiting structure 130 disposed on the substrate assembly 110. The substrate assembly 110 includes a first substrate 111 and a second substrate 112. The first substrate 111 and the second substrate 112 form a second cavity 101 at their edges, serving as a second force transmission structure 420. A portion of the connecting structure 500 is disposed in the second cavity 101. The connecting structure 500 includes a bushing 5112 extending out of the second substrate 112. The cell unit 300 is connected to the side of the upper cover assembly 100 facing the lower frame 200 via the structural adhesive layer 700. The lower frame 200 includes a cold plate 210, a protective plate 230, and an electrical distribution box 220 disposed on the cold plate 210. The cold plate 210 includes a heat spreader 211 and a flow channel plate 212. The edge of the cold plate 210 can limit the gap between the second substrate 112 and the bushing 5112. In addition, both the upper cover assembly 100 and the cold plate 210 are designed as recessed structures.

[0271] Among the aforementioned components, the first substrate 111, the second substrate 112, the heat spreader 211, the flow channel plate 212, and the protective plate 230 can all be formed by stamping, thereby improving the production efficiency of the battery pack 20, reducing the manufacturing cost of the battery pack 20, and making it suitable for mass production.

[0272] In the aforementioned battery pack 20, the first substrate 111 and the second substrate 112 can be connected by welding, the heat spreader 211 and the flow channel plate 212 can be connected by welding, the cold plate 210 and the upper cover assembly 100 can be connected by bolts or other fasteners, and the protective plate 230 and the cold plate 210 can be connected by bolts or other fasteners. The connections between the components that need to be connected are reliable and easy to operate. The fit between the cold plate 210 and the gap, combined with the recessed structure of the upper cover assembly 100 and the cold plate 210, makes the battery pack 20 more compact in structure, which is beneficial for expanding the internal space of the battery pack 20, reducing the overall weight of the battery pack 20, and improving the driving range of the battery pack 20 in the vehicle.

[0273] When assembling the battery pack 20, the top cover assembly 100 can be placed at the workstation first, then the structural adhesive layer 700 can be applied to the top cover assembly 100, followed by the installation of the cell unit 300, and then the cold plate 210 and protective plate 230. The overall assembly process is simple and efficient. When connecting the battery pack 20 to the vehicle frame 11, the battery pack 20 can be rotated 180 degrees, and then the connection between the battery pack 20 and the vehicle frame 11 can be achieved by locking the bolts into the connecting structure 500, resulting in high installation efficiency.

[0274] During the assembly of the battery pack 20 and its installation onto the vehicle frame 11, it is evident that the battery pack 20 can form an independent and stable structure before being installed onto the vehicle frame 11. This reduces the installation difficulty of the battery pack 20 and allows for sealing of the battery pack 20 before installation onto the vehicle, simplifying the sealing structure and improving sealing performance. Furthermore, based on the design of the force transmission structures 400 on the top cover assembly 100, the top cover assembly 100 possesses sufficient strength and rigidity, serving as a load-bearing structure to support the cell units 300, cold plate 210, etc. Located on the outside of the battery pack 20, the top cover assembly 100 provides more space for the cell units 300, allowing them to fill the internal space of the battery pack 20. This improves the space utilization of the cell units 300, thereby increasing the capacity of the battery pack 20.

[0275] Figure 13 is an exploded schematic diagram of the electrical equipment provided in the embodiment of this application.

[0276] Referring to Figure 13, the electrical equipment includes the equipment body and the battery pack 20. The following description uses a vehicle as an example. The vehicle includes a body (not shown in the figure) and a frame 11, which supports the body. The battery pack 20 is connected to the frame 11. The battery pack 20 supplies power to the vehicle. A vehicle may include one battery pack 20 or multiple battery packs 20.

[0277] Figure 14 is a structural schematic diagram of the battery pack 20 provided in the embodiment of this application, and Figure 15 is an exploded schematic diagram of the battery pack 20 provided in the embodiment of this application.

[0278] Referring to Figures 14 and 15, the battery pack 20 includes an upper cover assembly 100, a cell unit 300, and a lower frame 200. The upper cover assembly 100 covers the lower frame 200, and a receiving cavity is formed between the upper cover assembly 100 and the lower frame 200. The cell unit 300 is located in the receiving cavity.

[0279] The upper cover assembly 100 and the lower frame 200 of the battery pack 20 form the outer shell of the battery pack 20. The outer shell can be a cuboid structure, and the outer shell has a first direction Y, a second direction X, and a third direction Z. The first direction Y is one of the length direction and the width direction of the outer shell, and the second direction X is the other of the length direction and the width direction of the outer shell. In Figure 14, the first direction Y is the width direction, the second direction X is the length direction, and the third direction Z is the thickness direction of the outer shell.

[0280] When the upper cover assembly 100 is placed on the lower frame 200, there is a receiving cavity between the upper cover assembly 100 and the lower frame 200, in which the battery cell unit 300 or other devices can be placed. The battery cell unit 300 includes a plurality of battery cells 310, which are arranged along the second direction X.

[0281] The lower frame 200 includes a protective plate 230 and a cold plate 210. The cold plate 210 is mounted on the protective plate 230. When the battery cell unit 300 is located in the receiving cavity, the side of the battery cell unit 300 facing the lower frame 200 can contact the cold plate 210. The cold plate 210 is used to dissipate heat from the battery cell 310 in the battery cell unit 300.

[0282] The battery pack 20 also includes a power distribution box 220, which is used to manage and monitor the operating status of the battery cell units 300 in the battery pack 20. In Figure 13, the power distribution box 220 is mounted on the cold plate 210.

[0283] The specific structure of the upper cover assembly 100 will be described below.

[0284] Figure 16 is a structural schematic diagram of the top cover assembly 100 provided in the embodiment of this application, Figure 17 is an exploded schematic diagram of the top cover assembly 100 provided in the embodiment of this application, and Figure 18 is a cross-sectional view along CC in Figure 16.

[0285] Referring to Figures 16 to 18, the top cover assembly 100 includes: a first substrate 111 and a second substrate 112. The first substrate 111 includes a first substrate body 1112 and a first extension 1113 connected to at least one side edge of the first substrate body 1112. The second substrate 112 is connected to the first substrate 111, and a second cavity 101 is provided between the second substrate 112 and the first extension 1113.

[0286] The first substrate 111 faces the lower frame 200. The first substrate 111 is the supporting body of the upper cover assembly 100. The first substrate 111 includes a first substrate body 1112, which can be rectangular, circular, elliptical, or other polygonal. The following description takes a rectangular first substrate body 1112 as an example.

[0287] At least one side edge of the first substrate body 1112 is provided with a first extension 1113, that is, the first extension 1113 is connected to the first substrate body 1112 and extends outward from the first substrate body 1112.

[0288] When the first substrate body 1112 is rectangular, the first substrate body 1112 has four sides. For example, the first extension 1113 can be provided at the edge of one side of the first substrate body 1112, the first extension 1113 can be provided at the edges of two sides of the first substrate body 1112, the first extension 1113 can be provided at the edges of three sides of the first substrate body 1112, or the first extension 1113 can be provided at the edges of four sides of the first substrate body 1112.

[0289] In the embodiments shown in Figures 16 to 18, the first extension 1113 can be integrally formed with the first substrate body 1112.

[0290] The second substrate 112 is disposed on the side of the first substrate 111 away from the lower frame 200. The size of the second substrate 112 along the first direction Y can be close to the size of the first substrate 111 along the first direction Y, and the size of the second substrate 112 along the second direction X can be close to the size of the first substrate 111 along the second direction X.

[0291] The second substrate 112 is fastened to the first substrate 111, connecting the second substrate 112 to the first substrate 111. For example, the second substrate 112 can be connected to the first substrate 111 via fasteners, or it can be bonded to the first substrate 111. At this time, a second cavity 101 is formed between the second substrate 112 and the first extension 1113, and the second cavity 101 is located at at least one edge of the upper cover assembly 100. For example, the second cavity 101 can be located at the edge of one side of the upper cover assembly 100, the second cavity 101 can be located at the edges of two sides of the upper cover assembly 100, the second cavity 101 can be located at the edges of three sides of the upper cover assembly 100, or the second cavity 101 can be located at the edges of all four sides of the upper cover assembly 100. That is, the second cavity 101 can be formed at any edge of the first substrate body 1112 where the first extension 1113 is connected.

[0292] The second cavity 101 can increase the dimension of at least one side of the cover assembly 100 along the third direction Z, so that the cover assembly 100 has a higher resistance to torsion and deformation, thereby further increasing the strength of the cover assembly 100.

[0293] Furthermore, the first substrate body 1112 and the second substrate body 1125 form a two-layer structure, and a second cavity 101 is formed on the periphery of the upper cover assembly 100. This allows the thickness of both the first substrate 111 and the reinforcing plate to be set relatively small to meet the strength requirements of the upper cover assembly 100, resulting in a lower material cost for the upper cover assembly 100. Thus, the upper cover assembly 100 can have both high strength and low cost.

[0294] The top cover assembly 100 provided in this application is provided with a first substrate 111 and a second substrate 112. The first substrate 111 includes a first substrate body 1112 and a first extension 1113 connected to at least one side of the first substrate body 1112. A second cavity 101 is provided between the first extension 1113 and the second substrate 112, which can increase the strength of the top cover assembly 100. The thickness of the first substrate 111 and the reinforcing plate is set to be small, so that the material cost of the top cover assembly 100 is small. Thus, the top cover assembly 100 can have both high strength and low cost.

[0295] The second substrate 112 includes a second substrate body 1125 and a second extension 1126 connected to at least one side edge of the second substrate body 1125; the second substrate body 1125 is connected to the first substrate body 1112, and a second cavity 101 is provided between the first extension 1113 and the second extension 1126.

[0296] The second substrate 112 includes a second substrate body 1125, which may also be rectangular. The size of the second substrate body 1125 along the first direction Y may be close to the size of the first substrate body 1112 along the first direction Y, and the size of the second substrate body 1125 along the second direction X may be close to the size of the first substrate body 1112 along the second direction X.

[0297] A second extension 1126 is provided on at least one side of the second substrate body 1125, that is, the second extension 1126 extends outward from the second substrate body 1125. The second extension 1126 corresponds to the first extension 1113. In the embodiments shown in FIG16 to FIG18, the second extension 1126 may be integrally formed with the second substrate body 1125.

[0298] The second substrate 112 is fastened onto the first substrate 111, and the second substrate body 1125 is connected to the first substrate body 1112. For example, the second substrate body 1125 can be connected to the first substrate body 1112 by fasteners, or the second substrate body 1125 can be bonded to the first substrate body 1112. At this time, a second cavity 101 is formed between the first extension 1113 and the second extension 1126, and the second cavity 101 is located on the periphery of the upper cover assembly 100.

[0299] By connecting the first substrate body 1112 and the second substrate body 1125, the upper cover assembly 100 forms a two-layer stacked structure. Compared with simply increasing the thickness of a structural component, the stacked structure can further improve the strength of the upper cover assembly 100 due to the mutual restriction between the layers.

[0300] In addition, the outer surfaces of the first substrate 111 and the second substrate 112 may be coated with a reinforcing coating. For example, a zinc-aluminum-magnesium plating layer may be coated on the outer surfaces of the first substrate 111 and the second substrate 112 by electrophoresis to further increase the strength of the first substrate 111 and the second substrate 112.

[0301] Figure 19 is a structural schematic diagram of the top cover assembly 100 provided in an embodiment of this application from another angle; Figure 20 is a structural schematic diagram of the top cover assembly 100 and the cell unit 300 in the battery pack 20 provided in an embodiment of this application.

[0302] Referring to Figures 19 and 20, by increasing the strength of the upper cover assembly 100, the upper cover assembly 100 becomes capable of bearing loads, and the battery cell unit 300 can be connected to the first substrate 111 in the upper cover assembly 100. The upper cover assembly 100 can share part of the weight of the battery cell unit 300, thereby appropriately reducing the thickness of the lower frame 200, and thus reducing the material cost of the lower frame 200.

[0303] Specifically, the battery pack 20 also includes an adhesive (not shown in the figure) for bonding the cell unit 300 and the first substrate 111.

[0304] The adhesive can bond the cell unit 300 to the side of the first substrate 111 facing away from the second substrate 112. The adhesive occupies a small space along the third direction Z. By bonding with the adhesive, the size of the battery pack 20 along the third direction Z can be reduced.

[0305] It should be noted that when assembling the battery pack 20, first, the first substrate 111 is placed facing upwards on the operating table of the upper cover assembly 100. The battery cell unit 300 is then bonded to the first substrate 111 using adhesive. Next, the lower frame 200 is placed upside down on the upper cover assembly 100. The lower frame 200 and the upper cover assembly 100 are then joined, and finally, the battery pack 20 is flipped over to complete the assembly of the battery pack 20. The entire assembly process only requires one flip, which simplifies the assembly process of the battery pack 20 compared to the related technology where the battery cell unit 300 needs to be flipped twice when connected to the tray.

[0306] Figure 21 is a cross-sectional view along CC in the figure.

[0307] As shown in the figure, the top cover assembly 100 also includes a filler 140, which fills the second cavity 101.

[0308] The substrates of the first substrate 111 and the second substrate 112 in the cover assembly 100 are typically made of steel or other high-strength metals to ensure the strength of the cover assembly 100. The filler 140 can be foam or other lightweight materials, and its cost is lower than that of steel. Filling the second cavity 101 with the filler 140 can further increase the strength of the cover assembly 100 with a small increase in weight and cost.

[0309] Please continue to refer to Figures 18 and 21. The first extension 1113 is bent away from the second extension 1126 from the first substrate body 1112 to form a second cavity 101 between the first extension 1113 and the second extension 1126.

[0310] The first substrate body 1112 is attached to the second substrate body 1125, thereby the first extension 1113 bends away from the second extension 1126 from the first substrate body 1112, so that there is a gap between the first extension 1113 and the second extension 1126 in the third direction Z. This gap allows a second cavity 101 to be formed between the first extension 1113 and the second extension 1126.

[0311] By bending the first extension 1113 away from the second extension 1126 from the first substrate body 1112, the second cavity 101 is formed, and the first extension 1113 and the first substrate body 1112 form an inverted bowl-shaped structure, which facilitates the fastening of the first substrate 111 onto the lower frame 200. In addition, the side of the second substrate 112 away from the first substrate 111 is a planar structure, which also facilitates the connection of the upper cover assembly 100 to the vehicle frame 11.

[0312] In one possible implementation, the second extension 1126 is bent away from the first extension 1113 from the second substrate body 1125, and a second cavity 101 may also be formed between the first extension 1113 and the second extension 1126. In another possible implementation, the second extension 1126 is bent away from the first extension 1113 from the second substrate body 1125, while the first extension 1113 is bent away from the second extension 1126 from the first substrate body 1112, and a second cavity 101 may also be formed between the first extension 1113 and the second extension 1126.

[0313] Please continue to refer to Figures 18 and 21, where a portion of the second extension 1126 bends toward the first extension 1113 and connects with the first extension 1113.

[0314] The edge of the second extension 1126 is bent toward the first extension 1113 to approach or contact the first extension 1113 so that the second extension 1126 can be connected to the first extension 1113.

[0315] Please continue to refer to Figures 18 and 21. The upper cover assembly 100 also includes a fastening connector 115. The second extension 1126 and the first extension 1113 are connected by the fastening connector 115, which is used to connect to the lower frame 200 of the battery pack 20.

[0316] The fastening connector 115 can be a projection weld nut or other fastener. The fastening connector 115 passes through the first extension 1113 and the second extension 1126 to connect the first extension 1113 and the second extension 1126. A threaded hole with internal threads can be provided on the other side of the fastening connector 115 facing the lower frame 200. Other fastening connectors 115, such as fastening bolts, can pass through the lower frame 200 and the threaded hole to connect the upper cover assembly 100 to the lower frame 200.

[0317] In another embodiment, the second extension 1126 and the first extension 1113 can also be connected by bonding the first seal 120 and then spot welding.

[0318] The first substrate body 1112 has a first extension 1113 connected to at least both sides of the first direction Y, and the second substrate body 1125 has a second extension 1126 connected to at least both sides of the first direction.

[0319] The first substrate body 1112 has a larger dimension along the second direction X. Therefore, first extensions 1113 can be provided at both edges extending along the second direction X, that is, first extensions 1113 are connected at both edges along the first direction Y. Correspondingly, second extensions 1126 are also provided at the two edges extending along the second direction X of the second substrate body 1125. The top cover assembly 100 is prone to deformation in the direction of larger dimension. Therefore, providing a second cavity 101 along the direction of larger dimension can improve the deformation resistance of the top cover assembly 100.

[0320] Please refer to Figure 17. At least one stress buffer window 1211 is provided on the second substrate body 1125.

[0321] By providing a stress buffer window 1211 on the second substrate body 1125, the deformation of the second substrate body 1125 can be reduced, and the weight of the second substrate body 1125 can also be reduced. One stress buffer window 1211 can be provided on the second substrate body 1125, or two or more stress buffer windows 1211 can be provided. In the figure, three stress buffer windows 1211 are schematically shown.

[0322] Please refer to Figure 17. A first sealing member 120 is provided between the second substrate body 1125 and the first substrate body 1112. The first sealing member 120 is located at the edge of the second substrate body 1125, and / or, the first sealing member 120 is located on the periphery of the stress buffer window 1211.

[0323] Specifically, a first sealing member 120 can be provided at the edge of the second substrate body 1125, and the first sealing member 120 adheres to the edge of the second substrate body 1125 and the edge of the first substrate body 1112. This can prevent liquid in the second cavity 101 from entering the device through the gap between the second substrate body 1125 and the first substrate body 1112 and through the stress buffer window 1211.

[0324] In some embodiments, a first sealing element 120 may be provided around the stress buffer window 1211 to seal the gap between the second substrate body 1125 and the first substrate body 1112 multiple times. The first sealing element 120 may be a spot-welded first sealing element 120, which has strong adhesion and good corrosion resistance.

[0325] The first substrate body 1112 is provided with a maintenance window 1115 on one side along the second direction X. The first substrate body 1112 is connected to the other edge along the second direction X with a first extension 1113. The second substrate body 1125 is connected to the edge of the first extension 1113 along the second direction X with a second extension 1126. The projection of the second substrate body 1125 on the first substrate body 1112 is spaced apart from the maintenance window 1115.

[0326] The maintenance window 1115 is roughly aligned with the distribution box 220 on the tray along the third direction Z to facilitate maintenance of the distribution box 220 from the maintenance window 1115. At the maintenance window 1115, the second substrate body 1125 is not covered on the first substrate body 1112 so that the second substrate body 1125 avoids the maintenance window 1115.

[0327] The first substrate body 1112 is connected to the edge of the side opposite to the maintenance window 1115 along the second direction X with a first extension 1113. The second substrate body 1125 is also provided with a second extension 1126 at the corresponding position. The first extension 1113 and the second extension 1126 also form a second cavity 101 on the side opposite to the maintenance window 1115, so as to further increase the strength of the upper cover assembly 100.

[0328] The top cover assembly 100 also includes at least one crossbeam 411, which extends along a first direction Y and is disposed on the side of the second substrate body 1125 opposite to the first substrate body 1112, and the crossbeam 411 is connected to the second substrate body 1125.

[0329] The crossbeams 411 can extend along the first direction Y. Three crossbeams 411 are shown in Figures 16 and 17. The crossbeams 411 can further increase the strength of the upper cover assembly 100. Referring to Figure 13, the frame 11 includes three mounting beams: the right crossbeam 11b3 411, which is the front seat beam, the body beam (i.e., the middle beam 11b2), and the rear seat beam (i.e., the left crossbeam 11b1). The three crossbeams 411 are respectively connected to the right crossbeam 11b3, i.e., the front seat beam, the body beam (i.e., the middle beam 11b2), and the rear seat beam (i.e., the left crossbeam 11b1).

[0330] Figure 22 is a cross-sectional view along DD in Figure 16, and Figure 23 is a cross-sectional view along EE in Figure 16.

[0331] Referring to Figures 16, 17, 22, and 23, the upper cover assembly 100 also includes lugs 5111 corresponding to both ends of the crossbeam 411. The lugs 5111 are at least partially located in the second cavity 101. The lugs 5111 include a first lug connecting portion 51111 and a second lug connecting portion 51112. The first lug connecting portion 51111 is connected to the first extension portion 1113, and the second lug connecting portion 51112 is connected to the second extension portion 1126. The lugs 5111 are used for connection with the vehicle.

[0332] The first extension 1113 has a welding opening 1114. One end of the lifting lug 5111 facing the first extension 1113 passes through the welding opening 1114. A first lifting lug connecting part 51111 can be provided near the first extension 1113. The first lifting lug connecting part 51111 overlaps the first extension 1113 and is connected to the first extension 1113. For example, the first lifting lug connecting part 51111 can be welded to the first extension 1113 by laser penetration welding.

[0333] The second extension 1126 has a welding opening 1114. One end of the lifting lug 5111 facing the second extension 1126 passes through the welding opening 1114. A second lifting lug connecting part 51112 can be provided near the second extension 1126. The second lifting lug connecting part 51112 overlaps the second extension 1126 and is connected to the second extension 1126. For example, the first lifting lug connecting part 51111 can be welded to the second extension 1126 by laser brazing.

[0334] The battery pack 20 also includes an adapter (not shown in the figure) that connects to a lug 5111. For example, the lug 5111 has a mounting channel 501, and the adapter is inserted into the mounting channel 501 for threaded connection with the lug 5111. The adapter is used to connect the upper and lower frames 200 to the upper cover assembly 100. The end of the lug 5111 facing away from the adapter is used for connection to the vehicle. By providing lugs 5111 at both ends of the crossbeam 411, the upper cover assembly 100 can be connected to the lower frame 200 and the vehicle at locations where the upper cover assembly 100 has higher strength, reducing the load on other areas of the upper cover assembly 100.

[0335] By clamping the lug 5111 between the first extension 1113 and the second extension 1126, the movement of the lug 5111 and the adapter connected to the lug 5111 along the third direction Z can be restricted, thereby reducing the stress at the connection between the lug 5111 and the first extension 1113 and the second extension 1126.

[0336] The cover assembly 100 is also provided with lifting lugs 5111 at the position aligned with the crossbeam 411. The lifting lugs 5111 are arranged at intervals along the edge of the cover assembly 100. These lifting lugs 5111 are used to connect with the vehicle to increase the reliability of the connection between the cover assembly 100 and the vehicle.

[0337] Please continue to refer to Figures 22 and 23. The top cover assembly 100 also includes a filler 140, which is connected to at least a portion of the outer peripheral surface of the lug 5111 and to the first extension 1113 and the second extension 1126.

[0338] The filler 140 wraps around a portion of the outer periphery of the lug 5111 and covers the first extension 1113 and the second extension 1126, which can reduce the strength loss of the upper cover assembly 100 caused by the lug 5111.

[0339] Referring to Figures 16, 17 and 23, a first cavity 4111 is provided between the crossbeam 411 and the second base plate body 1125. A second connector 172 is provided in the first cavity 4111 for connecting with the vehicle.

[0340] A crossbeam 411 protrudes from the surface of the second substrate body 1125, forming a first cavity 4111 between the crossbeam 411 and the second substrate body 1125. The crossbeam 411 has a through hole 173. One end of the second connector 172 is connected to the second substrate body 1125, and the other end of the second connector 172 is aligned with the through hole 173 so that the second connector 172 can be connected to a mounting beam in the frame 11. In other words, the crossbeam 411 increases the strength of the cover assembly 100 while also facilitating connection to the frame 11 of the vehicle 1000.

[0341] Furthermore, by placing the crossbeam 411 on one side of the second substrate 112, the crossbeam 411 can be prevented from occupying space in the receiving cavity of the battery pack 20, thereby allowing the receiving cavity to accommodate more battery cells 310 or other devices.

[0342] Referring to Figures 13, 15, and 16, the vehicle 1000 also includes a body seal 600 disposed between the frame 11 and the cover assembly 100, which serves as a protective plate 230 for the vehicle. The body seal 600 is also schematically shown in Figures 17, 22, and 23.

[0343] The top cover assembly 100 has high strength and, while protecting the battery cell units 300 in the battery pack 20, can also be connected to the vehicle frame 11 to serve as a protective plate 230 for the vehicle. This reduces the number of components in the vehicle and simplifies its structure. A body sealing ring 600 is provided between the top cover assembly 100 and the frame 11 to seal the gap between them.

[0344] Please refer to Figure 17. The upper cover assembly 100 also includes a second reinforcing plate 124. The first base plate body 1112 is connected to a first extension 1113 on one side edge near the maintenance window 1115. The second reinforcing plate 124 surrounds at least one side of the maintenance window 1115 and is connected to the first extension 1113.

[0345] The second reinforcing plate 124 is used to reinforce the position of the maintenance window 1115 of the first substrate 111. Specifically, the second reinforcing plate 124 can be provided around the periphery of the maintenance window 1115. The second reinforcing plate 124 can be bonded to the first extension 1113 by spot welding the first sealing member 120, thereby reducing the impact of opening the maintenance window 1115 on the strength of the first substrate 111.

[0346] Please refer to Figure 17. The upper cover assembly 100 also includes a maintenance window cover plate 190, which covers the maintenance window 1115 and is connected to the first base plate body 1112 by projection welding nuts.

[0347] For example, the first substrate body 1112 may be provided with a projection weld nut on the periphery of the maintenance window 1115. The maintenance window cover 190 may be connected to the projection weld nut by bolts. The projection weld nut has a high breaking torque, so that the connection between the projection weld nut and the first substrate body 1112 can still remain sealed during the bolt tightening process.

[0348] Figure 24 is an enlarged view of point F in Figure 16.

[0349] Referring to Figure 24, the second reinforcing plate 124 includes a water-blocking edge 125, which wraps around the side of the first extension 1113.

[0350] The water-blocking edge 125 is folded from the second reinforcing plate 124 to the side of the first extension 1113 away from the second substrate 112 or the second reinforcing plate 124. Thus, the water-blocking edge 125 can block the gap between the first extension 1113 and the second reinforcing plate 124, preventing liquid from entering the upper cover assembly 100 from the gap.

[0351] Please continue to refer to Figures 19 and 20. The upper cover assembly 100 also includes an expansion beam 131, which is connected to the side of the first substrate body 1112 away from the second substrate 112. The expansion beam 131 is used to limit the position of the battery cell unit 300.

[0352] Specifically, there are two expansion beams 131, which are connected to both ends of the upper cover assembly 100 along the second direction X. The two expansion beams 131 clamp the two sides of the battery cell unit 300. When the battery cell 310 in the battery cell unit 300 expands due to heat, the expansion beams 131 can limit the battery cell unit 300 along the second direction X. The sides of the expansion beams 131 also include support legs 132, which abut against the connection between the expansion beams 131 and the first substrate body 1112 to increase the load-bearing capacity of the expansion beams 131.

[0353] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0354] In the description of this application, it should be understood that the terms "comprising" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device 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 device.

[0355] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the connection within 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0356] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover assembly (100), wherein, include: The first substrate (111) includes a first substrate body (1112) and a first extension (1113) connected to at least one side edge of the first substrate body (1112). The second substrate (112) is connected to the first substrate (111), and a second cavity (101) is provided between the second substrate (112) and the first extension (1113).

2. The cover assembly (100) according to claim 1, wherein, The second substrate (112) includes a second substrate body (1125) and a second extension (1126) connected to at least one side edge of the second substrate body (1125); The second substrate body (1125) is connected to the first substrate body (1112), and the second cavity (101) is provided between the first extension (1113) and the second extension (1126).

3. The cover assembly (100) according to claim 2, wherein, The first extension (1113) is bent away from the second extension (1126) from the first substrate body (1112) to form the second cavity (101) between the first extension (1113) and the second extension (1126).

4. The cover assembly (100) according to claim 3, wherein, Part of the second extension (1126) is bent toward the first extension (1113) and connected to the first extension (1113).

5. The cover assembly (100) according to claim 4, wherein, It also includes a fastening connector (115) through which the second extension (1126) and the first extension (1113) are connected, the fastening connector (115) being used to connect to the lower frame (200) of the battery pack (20).

6. The cover assembly (100) according to claim 2, wherein, The first substrate body (1112) is connected to the first extension (1113) at least along both sides of the first direction, and the second substrate body (1125) is connected to the second extension (1126) at least along both sides of the first direction.

7. The cover assembly (100) according to claim 6, wherein, At least one stress-buffering window (1211) is provided on the second substrate body (1125).

8. The cover assembly (100) according to claim 7, wherein, A first sealing member (120) is provided between the second substrate body (1125) and the first substrate body (1112). The first sealing member (120) is located at the edge of the second substrate body (1125), and / or the first sealing member (120) is located on the periphery of the stress buffer window (1211).

9. The cover assembly (100) according to claim 6, wherein, The first substrate body (1112) has a maintenance window (1115) on one side along the second direction. The first substrate body (1112) is connected to the first extension (1113) on the other side edge along the second direction. The second substrate body (1125) is connected to the second extension (1126) on the side edge of the second direction corresponding to the first extension (1113). The projection of the second substrate body (1125) on the first substrate body (1112) is spaced apart from the maintenance window (1115). The second direction intersects the first direction.

10. The cover assembly (100) according to any one of claims 6 to 9, wherein, It also includes at least one crossbeam (411) that extends along the first direction and is disposed on the side of the second substrate body (1125) away from the first substrate body (1112), and the crossbeam (411) is connected to the second substrate body (1125).

11. The cover assembly (100) according to claim 10, wherein, It also includes a plurality of lugs (5111) corresponding to both ends of the crossbeam (411). The lugs (5111) are at least partially located in the second cavity (101). The lugs (5111) include a first lug connecting part (51111) and a second lug connecting part (51112). The first lug connecting part (51111) is connected to the first extension part (1113), and the second lug connecting part (51112) is connected to the second extension part (1126). The lugs (5111) are used to connect to electrical equipment.

12. The cover assembly (100) according to claim 11, wherein, It also includes a filler (140) connected to at least a portion of the outer peripheral surface of the lug (5111) and connected to the first extension (1113) and the second extension (1126).

13. The cover assembly (100) according to claim 11, wherein, The crossbeam (411) and the second base plate body (1125) have a hollow structure, and a second connector (172) is provided in the hollow structure. The second connector (172) is used to connect to electrical equipment.

14. The cover assembly (100) according to any one of claims 1 to 9, wherein, It also includes a filler (140) that fills the second cavity (101).

15. The cover assembly (100) according to any one of claims 2 to 9, wherein, It also includes a lug (5111) that connects the first extension (1113) and the second extension (1126) and is used to connect to electrical equipment.

16. The cover assembly (100) according to any one of claims 6 to 9, wherein, It also includes a second reinforcing plate (124), a maintenance window (1115) is provided on one side of the first substrate body (1112) along the second direction, the projection of the second substrate body (1125) on the first substrate body (1112) is spaced apart from the maintenance window (1115), the first extension (1113) is connected to the edge of the first substrate body (1112) near the maintenance window (1115), the second reinforcing plate (124) surrounds at least one side of the maintenance window (1115) and is connected to the first extension (1113), and the second direction intersects the first direction.

17. The cover assembly (100) according to claim 16, wherein, The second reinforcing plate (124) includes a water-blocking edge (125) that wraps around the side of the first extension (1113).

18. The cover assembly (100) according to claim 16, wherein, It also includes a maintenance window cover plate (190), which covers the maintenance window and is connected to the first base plate body (1112) by projection welding nuts.

19. The cover assembly (100) according to any one of claims 1 to 9, wherein, It also includes a first expansion limiting structure (130), which is connected to the side of the first substrate body (1112) away from the second substrate (112) and is used to limit the cell unit (300).

20. A battery pack (20), wherein, include: A cover assembly (100) is configured to be at least connected to the frame (11) of a vehicle (1000), the cover assembly (100) forming a force transmission structure (400) from its interior toward the edge of the cover assembly (100); The lower frame (200) is connected to the upper cover assembly (100) and forms a receiving cavity (27); A battery cell unit (300) is at least partially connected to the top cover assembly (100), and the battery cell unit (300) is disposed in the receiving cavity (27).

21. The battery pack (20) according to claim 20, wherein, The upper cover assembly (100) includes: The substrate assembly (110) includes a first force transmission structure (410) connected to one side of the substrate assembly (110).

22. The battery pack (20) according to claim 21, wherein, The first force transmission structure (410) includes a plurality of crossbeams (411) arranged along the width direction of the upper cover assembly (100), the plurality of crossbeams (411) being spaced apart and arranged parallel to each other on the substrate assembly (110).

23. The battery pack (20) according to claim 22, wherein, The crossbeam (411) is a solid structure.

24. The battery pack (20) according to claim 22, wherein, The crossbeam (411) is designed to have a first cavity (4111).

25. The battery pack (20) according to claim 24, wherein, The crossbeam (411) includes: A connecting part (4112) is connected to the substrate assembly (110); And a protrusion (4113), which is connected to the connecting portion (4112) and forms the first cavity (4111).

26. The battery pack (20) according to claim 25, wherein, The protrusion (4113) has openings at both ends, and the crossbeam (411) further includes: End plate (4114), which is inclinedly disposed at the opening.

27. The battery pack (20) according to claim 22, wherein, At least a portion of the edge of the top cover assembly (100) is formed with a second cavity (101), and the second cavity (101) forms a second force transmission structure (420).

28. The battery pack (20) according to claim 27, wherein, The substrate assembly (110) includes: First substrate (111); And a second substrate (112), which is connected to the first substrate (111) and forms the second cavity (101), and the crossbeam (411) is connected to the second substrate (112).

29. The battery pack (20) according to claim 28, wherein, The crossbeam (411) divides the area where the substrate assembly (110) is located into several first regions (110a), and the second substrate (112) includes: Multiple region structures (1121), each of which encloses a second region (112a) corresponding to the first region (110a).

30. The battery pack (20) according to claim 29, wherein, The second substrate (112) includes: An edge structure portion (1122) is provided circumferentially; And an intermediate structure portion (1123) is disposed inside the edge structure portion (1122) to divide the edge structure portion (1122) into a plurality of second regions (112a), and the edge structure portion (1122) and the intermediate structure portion (1123) surrounding the second region (112a) form the region structure (1121).

31. The battery pack (20) according to claim 28, wherein, A first sealing member (120) is provided between the first substrate (111) and the second substrate (112), and the first sealing member (120) extends correspondingly to the region structure (1121).

32. The battery pack (20) according to claim 28, wherein, A first recessed region (1111) is formed at the edge of the first substrate (111); and / or, a second recessed region (1124) is formed at the edge of the second substrate (112).

33. The battery pack (20) according to claim 32, wherein, The first substrate (111) includes a first substrate body (1112) and a first extension (1113), the first extension (1113) bends outward from the edge of the first substrate body (1112) and forms the first recessed region (1111); and / or, the second substrate (112) includes a second substrate body (1125) and a second extension (1126), the second extension (1126) bends outward from the edge of the second substrate body (1125) and forms the second recessed region (1124).

34. The battery pack (20) according to claim 27, wherein, The second cavity (101) is filled with an expansion filler.

35. The battery pack (20) according to claim 27, wherein, The battery pack (20) also includes a connecting structure (500) disposed at the edge of the upper cover assembly (100) and forming an installation channel (501).

36. The battery pack (20) according to claim 35, wherein, The connecting structure (500) includes a first connecting structure (510) disposed in the second cavity (101), the first connecting structure (510) being disposed at the end of the crossbeam (411).

37. The battery pack (20) according to claim 36, wherein, The first connection structure (510) includes a lug assembly (511) inserted into the second cavity (101), the lug assembly (511) having a port (511a), the lug assembly (511) forming the mounting channel (501), and the outer wall surface of the lug assembly (511) being connected to the first substrate (111) and the second substrate (112).

38. The battery pack (20) according to claim 37, wherein, The lug assembly (511) includes: The lug (5111) has a first step (5111a) at a position corresponding to the first substrate (111) and a second step (5111b) at a position corresponding to the second substrate (112).

39. The battery pack (20) according to claim 38, wherein, The lug (5111) includes: A first connecting segment (5111c) is formed, which corresponds to the first substrate (111) and forms the first step (5111a). The second connecting segment (5111d) corresponds to the second substrate (112), and the second connecting segment (5111d) forms the second step (5111b); And a third connecting segment (5111e) is connected between the first connecting segment (5111c) and the second connecting segment (5111d), wherein the outer diameter of the first connecting segment (5111c) is larger than the outer diameter of the second connecting segment (5111d), and at least part of the outer wall surface of the third connecting segment (5111e) is inclined.

40. The battery pack (20) according to claim 38, wherein, The lug assembly (511) also includes: A bushing (5112) is disposed within the mounting channel (501) and extends from one side of the first substrate (111). The bushing (5112) has a bushing cavity (5112a) communicating with the mounting channel (501). A gap is formed between the bushing (5112) and the first substrate (111), and a portion of the lower frame (200) is confined within the gap.

41. The battery pack (20) according to claim 40, wherein, The lug assembly (511) also includes: A sealing plug (5113) is sealed within the bushing cavity (5112a).

42. The battery pack (20) according to claim 38, wherein, A second seal (5114) is provided between the lifting lug (5111) and the frame (11).

43. The battery pack (20) according to claim 41, wherein, A third seal (5115) is provided between the lug (5111) and the bushing (5112), and / or a fourth seal (5116) is provided between the bushing (5112) and the sealing plug (5113).

44. The battery pack (20) according to claim 37, wherein, The first connecting structure (510) has an outer side facing the edge of the cover assembly (100) and an inner side facing away from the edge of the cover assembly (100). A reinforcing structure (114) is filled between the first substrate (111) and the second substrate (112). The reinforcing structure (114) is located outside the first connecting structure (510), or the reinforcing structure (114) is located on both the outer and inner sides of the first connecting structure (510).

45. The battery pack (20) according to claim 36, wherein, The connection structure (500) includes a second connection structure (520) disposed at both ends of the upper cover assembly (100) in the length direction. The first substrate (111) and the second substrate (112) are attached to each other at both ends in the length direction, or the second substrate (112) is recessed inward along the length direction from the first substrate (111) to form at least one single-layer structure portion not covered by the second substrate (112) at the end of the first substrate (111).

46. ​​The battery pack (20) according to any one of claims 20 to 45, wherein, A structural adhesive layer (700) is provided on the side of the upper cover assembly (100) facing the lower frame (200), and the battery cell unit (300) is connected to the structural adhesive layer (700).

47. The battery pack (20) according to claim 46, wherein, The top cover assembly (100) is provided with an adhesive groove (102), and at least a portion of the structural adhesive layer (700) is embedded in the adhesive groove (102).

48. The battery pack (20) according to any one of claims 21 to 45, wherein, The upper cover assembly (100) includes: A first expansion limiting structure (130) is disposed on the substrate assembly (110), and the battery cell unit (300) is constrained between the first expansion limiting structures (130).

49. The battery pack (20) according to claim 48, wherein, The first expansion limiting structure (130) includes: An expansion beam (131) abuts against the battery cell unit (300); And a support bracket (132) is provided on the side of the expansion beam (131) away from the battery cell (300).

50. The battery pack (20) according to claim 49, wherein, The expansion beam (131) includes: The outer beam (1311) is designed to have a third cavity (1311a); And an inner beam (1312) is disposed within the third cavity (1311a).

51. The battery pack (20) according to claim 49, characterized in that, The support bracket (132) includes: The first support part (1321) abuts against the expansion beam (131); The second support portion (1322) abuts against the substrate assembly (110); And a third support portion (1323) connected between the first support portion (1321) and the second support portion (1322), the third support portion (1323) forming a fourth cavity.

52. The battery pack (20) according to claim 49, wherein, The first expansion limiting structure (130) further includes a stop (133) disposed on the lower frame (200). The stop (133) is located on the side of the expansion beam (131) away from the battery cell (300). The stop (133) is used to limit the expansion beam (131).

53. The battery pack (20) according to any one of claims 20 to 45, wherein, The lower frame (200) includes a cold plate (210), which forms the receiving cavity (27) with the upper cover assembly (100), and the cold plate (210) is connected to the upper cover assembly (100).

54. The battery pack (20) according to claim 53, wherein, The top cover assembly (100) has a first recessed receiving area on the side facing the battery cell (300), and the cold plate (210) has a second recessed receiving area corresponding to the position of the first recessed receiving area.

55. The battery pack (20) according to claim 54, wherein, The cold plate (210) includes: Heat spreader (211); And a flow channel plate (212), which is stacked with the heat spreader plate (211), and both the heat spreader plate (211) and the flow channel plate (212) are designed as recessed structures that are recessed in the direction away from the upper cover assembly (100).

56. The battery pack (20) according to claim 55, wherein, In the circumferential direction, the edge of the temperature distribution plate (211) is provided with a first edge (2111); in the circumferential direction, the edge of the flow channel plate (212) is provided with a second edge (2121). The first edge (2111) is provided with a first connecting portion (4112) for connecting with the upper cover assembly (100) at intervals; the second edge (2121) is provided with a second connecting portion (4112) for connecting with the upper cover assembly (100) at intervals.

57. The battery pack (20) according to claim 55, wherein, The inner side of the temperature distribution plate (211) is provided with a first reinforcing rib (2113), and the inner side of the flow channel plate (212) is provided with a second reinforcing rib corresponding to the position of the first reinforcing rib (2113).

58. The battery pack (20) according to claim 55, wherein, The heat spreader (211) is designed as a multi-layer structure, with adjacent layers made of different materials; the flow channel plate (212) is designed as a multi-layer structure, with adjacent layers made of different materials.

59. The battery pack (20) according to claim 53, wherein, The cold plate (210) is provided with a plug-in base (213), and the battery pack (20) further includes: A distribution box (220) is mounted on the cold plate (210) and connected to the plug-in base (213).

60. The battery pack (20) according to claim 53, wherein, The cold plate (210) is provided with a second expansion limiting structure, which abuts against the battery cell (300).

61. The battery pack (20) according to claim 53, wherein, The lower frame (200) also includes: A protective plate (230) is connected to the cold plate (210) and located on the side of the cold plate (210) away from the top cover assembly (100).

62. The battery pack (20) according to claim 20, wherein, The upper cover assembly (100) has a cavity, and the cavity is provided with crossbeams and longitudinal beams arranged in a crisscross pattern.

63. A battery pack (20), wherein, The device includes a battery cell unit (300), a lower frame (200), and an upper cover assembly (100) as described in any one of claims 1 to 19, the upper cover assembly (100) covering the lower frame (200), a receiving cavity being formed between the upper cover assembly (100) and the lower frame (200), and the battery cell unit (300) being located in the receiving cavity.

64. An electrical appliance, wherein, The electrical equipment includes a mounting bracket and a battery pack (20) according to any one of claims 20 to 63, the battery pack (20) including a cover assembly (100) connected to the mounting bracket.

65. The electrical equipment according to claim 64, wherein, The electrical equipment also includes a sealing ring disposed between the mounting bracket and the upper cover assembly (100).

66. The electrical equipment according to claim 65, wherein, The electrical equipment is a vehicle (1000), the mounting bracket is a vehicle frame (11), the sealing ring is a body sealing ring (600), and the body sealing ring (600) is disposed between the vehicle frame (11) and the upper cover assembly (100).

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