Battery pack and vehicle

Abstract

The invention relates to the technical field of batteries, and provides a battery pack and a vehicle, the battery pack comprises a first base body, a second base body and a battery cell unit, the first base body is configured to be at least capable of being connected to a vehicle frame of the vehicle, and the first base body forms a force transmission structure from the interior to the edge of the first base body; the second base body and the first base body are connected in a sealing mode to form a containing cavity, at least part of the battery cell units are connected to the first base body, and the battery cell units are arranged in the containing cavity. According to the battery pack, the space utilization rate in the battery pack can be improved, so that the capacity of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and a vehicle. Background Art

[0002] To ensure the structural strength of the vehicle-mounted battery pack, a tray is usually required to be designed for the vehicle-mounted battery pack. The battery cell units are set on the tray, and the upper cover of the battery pack can be installed on the vehicle. An intermediate crossbeam is designed in the tray to provide strength support. The tray can be connected to the vehicle through the intermediate crossbeam. The design of the intermediate crossbeam will occupy the space in the tray, reducing the space utilization rate in the battery pack, thereby affecting the capacity of the battery pack. Summary of the Invention

[0003] The present application provides a battery pack and a vehicle, which can improve the space utilization within the battery pack, thereby increasing the capacity of the battery pack.

[0004] A first aspect of the present application provides a battery pack, comprising:

[0005] A first base body is configured to be at least connectable to a vehicle frame, wherein the first base body forms a force transmission structure from an interior thereof to an edge of the first base body;

[0006] a second base body, sealed and connected to the first base body to form a receiving cavity;

[0007] and a battery cell unit, which is at least partially connected to the first substrate, and the battery cell unit is arranged in the receiving cavity.

[0008] According to the battery pack described in the first aspect of the present application, the battery pack is based on the setting of the force transmission structure on the first substrate. The force transmission structure enables the first substrate to have excellent structural strength and rigidity from its interior to its edge. The strength and rigidity of the first substrate are sufficient to bear the connection between the first substrate and the frame, the connection between the first substrate and the second substrate, and the connection between the first substrate and the battery cell unit, so that there is no need to set up the intermediate cross beam and other structures in the traditional technology in the battery pack, and more accommodation space can be provided for the battery cell unit. The battery cell unit can fill the internal space of the battery pack, thereby improving the space utilization in the battery pack and thus increasing the capacity of the battery pack.

[0009] In one possible implementation, the first substrate includes:

[0010] The base plate assembly, the force transmission structure includes a first force transmission structure connected to one side of the base plate assembly.

[0011] In one possible implementation, the first force transmission structure includes:

[0012] A plurality of beams are arranged along the width direction of the first base body, and the plurality of beams are spaced apart and arranged in parallel on the base plate assembly.

[0013] In one possible implementation, the crossbeam is a solid structure.

[0014] In one possible implementation manner, the crossbeam is designed to have a first cavity.

[0015] In one possible implementation, the crossbeam includes:

[0016] a connecting portion connected to the substrate assembly;

[0017] and a protruding portion connected to the connecting portion to form the first cavity.

[0018] In one possible implementation, openings are formed at both ends of the protrusion, and the crossbeam further includes:

[0019] An end plate is arranged obliquely at the opening.

[0020] In one possible implementation, a second cavity is formed on at least a portion of the edge of the first substrate, and the second cavity forms a second force transmission structure.

[0021] In one possible implementation, the substrate assembly includes:

[0022] a first substrate;

[0023] and a second substrate, wherein the second substrate is connected to the first substrate and forms the second cavity, and the beam is connected to the second substrate.

[0024] In one possible implementation, the crossbeam divides the area where the substrate assembly is located into a plurality of first areas, and the second substrate includes:

[0025] A plurality of area structures are provided, each of the area structures enclosing a second area corresponding to the first area.

[0026] In one possible implementation, the second substrate includes:

[0027] an edge structure portion, the edge structure portion being arranged along the circumferential direction;

[0028] and an intermediate structure portion provided inside the edge structure portion to divide the edge structure portion into a plurality of second regions, the edge structure portion and the intermediate structure portion surrounding the second regions forming the region structure.

[0029] In a possible implementation, a first sealing member is provided between the first substrate and the second substrate, and the first sealing member is extended and provided corresponding to the regional structure.

[0030] In a possible implementation, a first recessed area is formed at an edge of the first substrate; and / or a second recessed area is formed at an edge of the second substrate.

[0031] In one possible implementation, the first substrate includes a first substrate body and a first extension portion, the first extension portion is bent and extended outward from the edge of the first substrate body, and the first extension portion forms the first recessed area; and / or, the second substrate includes a second substrate body and a second extension portion, the second extension portion is bent and extended outward from the edge of the second substrate body, and the second extension portion forms the second recessed area.

[0032] In one possible implementation, the second cavity is filled with an expansion filler.

[0033] In one possible implementation, the battery pack further includes a connecting structure, which is disposed on an edge of the first substrate and forms a mounting channel.

[0034] In a possible implementation, the connection structure includes a first connection structure disposed in the second cavity, and the first connection structure is disposed corresponding to an end portion of the beam.

[0035] In one possible implementation, the first connection structure includes a lifting ear assembly inserted into the second cavity, the lifting ear assembly has a port, the lifting ear assembly forms the installation channel, and the outer wall surface of the lifting ear assembly is connected to the first substrate and the second substrate.

[0036] In one possible implementation, the lifting ear assembly includes:

[0037] A lifting ear is provided with a first step at a position corresponding to the first substrate, and a second step at a position corresponding to the second substrate.

[0038] In one possible implementation, the lifting lug includes:

[0039] a first connecting section, the first connecting section corresponding to the first substrate, the first connecting section forming the first step;

[0040] a second connecting section, the second connecting section corresponding to the second substrate, the second connecting section forming the second step;

[0041] 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 greater 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.

[0042] In one possible implementation, the lifting ear assembly further includes:

[0043] A bushing is arranged in the installation channel, the bushing extends from one side of the first substrate, the bushing has a bushing cavity connected to the installation channel, a gap is formed between the bushing and the first substrate, and a part of the second base is confined in the gap.

[0044] In one possible implementation, the lifting ear assembly further includes:

[0045] A sealing plug is sealed and connected in the bushing cavity.

[0046] In one possible implementation, a second sealing member is provided between the lifting eye and the vehicle frame.

[0047] In one possible implementation, a third seal is provided between the lifting ear and the bushing, and a fourth seal is provided between the bushing and the sealing plug.

[0048] In one possible implementation, the first connecting structure has an outer side facing the edge of the first substrate and an inner side facing away from the edge of the first substrate, and a reinforcement structure is filled between the first substrate and the second substrate. The reinforcement structure is located on the outer side of the first connecting structure, or the reinforcement structure is located on both the outer side and the inner side of the first connecting structure.

[0049] In one possible implementation, the connecting structure includes a second connecting structure arranged at both ends of the length direction of the first substrate, and the first substrate and the second substrate are fitted together at both ends of the length direction, or the second substrate is retracted inwardly relative to the first substrate along the length direction to form at least one single-layer structure portion at the end of the first substrate that is not covered by the second substrate.

[0050] In a possible implementation, a structural adhesive layer is provided on a side of the first substrate facing the second substrate, and the battery cell unit is connected to the structural adhesive layer.

[0051] In a possible implementation, a glue groove is provided on the first substrate, and at least a portion of the structural adhesive layer is embedded in the glue groove.

[0052] In one possible implementation, the first substrate includes:

[0053] The first expansion limiting structure is provided on the substrate assembly, and the battery cell unit is limited between the first expansion limiting structures.

[0054] In one possible implementation, the first expansion limiting structure includes:

[0055] an expansion beam abutting against the battery cell unit;

[0056] and a supporting bracket, which is supported on a side of the expansion beam facing away from the battery cell unit.

[0057] In one possible implementation, the expansion beam includes:

[0058] The outer beam is designed to have a third cavity;

[0059] and an inner beam disposed in the third cavity.

[0060] In one possible implementation, the support leg includes:

[0061] a first supporting portion, the first supporting portion abutting against the expansion beam;

[0062] a second supporting portion, the second supporting portion abutting against the substrate assembly;

[0063] and a third supporting portion connected between the first supporting portion and the second supporting portion, wherein the third supporting portion forms a fourth cavity.

[0064] In one possible implementation, the first expansion limiting structure further includes:

[0065] A stopper is provided on the second substrate, the stopper is located on a side of the expansion beam away from the battery cell unit, and the stopper is used to limit the expansion beam.

[0066] In one possible implementation, the second substrate includes:

[0067] A cold plate, wherein the cold plate and the first base form the receiving cavity, and the cold plate is connected to the first base.

[0068] In a possible implementation, a first recessed receiving area is formed on a side of the first base body facing the battery cell unit, and a second recessed receiving area is formed on the cold plate at a position corresponding to the first recessed receiving area.

[0069] In one possible implementation, the cold plate includes:

[0070] Vapor chamber;

[0071] and a flow channel plate, wherein the flow channel plate and the temperature averaging plate are stacked, and both the temperature averaging plate and the flow channel plate are designed to be concave structures concave in a direction away from the first substrate.

[0072] In a possible implementation, in the circumferential direction, the edge of the temperature uniform plate is provided with a first edge; in the circumferential direction, the edge of the flow channel plate is provided with a second edge.

[0073] First connecting portions for connecting to the first base are provided at intervals on the first edge; second connecting portions for connecting to the first base are provided at intervals on the second edge.

[0074] In a possible implementation, a first reinforcing rib is provided on the inner side of the temperature homogenizing plate, and a second reinforcing rib is provided on the inner side of the flow channel plate at a position corresponding to the first reinforcing rib.

[0075] In one possible implementation, the temperature equilibrium plate is designed as a multi-layer structure, and two adjacent layers are made of different materials; the flow channel plate is designed as a multi-layer structure, and two adjacent layers are made of different materials.

[0076] In one possible implementation, a plug-in base is provided on the cold plate, and the battery pack further includes:

[0077] A distribution box is arranged on the cold plate and connected to the plug base.

[0078] In one possible implementation, the second substrate further includes:

[0079] A protection plate is connected to the cold plate and is located on a side of the cold plate away from the first base.

[0080] In a possible implementation, a cavity is formed on the first base body, and force-transmitting transverse beams and force-transmitting longitudinal beams arranged in a crisscross pattern are provided in the cavity.

[0081] A second aspect of the present application provides a vehicle comprising the battery pack described in the first aspect.

[0082] In one possible implementation, the vehicle includes a chassis, the chassis includes a frame, and the battery pack is connected to the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0084] Figure 1 A schematic diagram of the installation of a battery pack and a chassis of a vehicle provided in accordance with an embodiment of the present application is shown;

[0085] Figure 2 A schematic diagram of installing a battery pack for a vehicle according to an embodiment of the present application is shown;

[0086] Figure 3 A schematic diagram showing the arrangement of a connection structure of a battery pack provided in accordance with an embodiment of the present application is shown;

[0087] Figure 4 A schematic diagram of an explosion of a battery pack provided according to an embodiment of the present application is shown;

[0088] Figure 5 A schematic structural diagram of a first substrate provided according to an embodiment of the present application is shown;

[0089] Figure 6 A schematic structural diagram of a first substrate provided by an embodiment of the present application from another angle is shown;

[0090] Figure 7 An exploded schematic diagram of a first substrate provided according to an embodiment of the present application is shown;

[0091] Figure 8 Shown Figure 6 Partial cross-sectional view along the AA direction;

[0092] Figure 9 A cross-sectional view of a battery pack provided according to an embodiment of the present application is shown;

[0093] Figure 10 Shown Figure 9 A partial enlarged view of the part in the middle B;

[0094] Figure 11 A schematic structural diagram of a first expansion limiting structure provided according to an embodiment of the present application is shown;

[0095] Figure 12 A schematic structural diagram of a cold plate provided according to an embodiment of the present application is shown.

[0096] Reference numerals:

[0097] 100-first base; 101-second cavity; 102-glue groove; 110-base plate assembly; 120-first sealing member; 130-first expansion limiting structure; 111-first base plate; 112-second base plate; 113-tilted arm; 114-reinforcement structure; 110a-first area; 120a-third area; 112a-second area; 131-expansion beam; 132-supporting bracket; 133-stopper; 1111-first recessed area; 1 112 - first substrate body; 1113 - first extension; 1114 - welding opening; 1121 - regional structure; 1122 - edge structure; 1123 - intermediate structure; 1124 - second recessed region; 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;

[0098] 200 - second base; 210 - cold plate; 220 - distribution box; 230 - protective plate; 211 - temperature averaging plate; 212 - flow channel plate; 213 - plug-in base; 2111 - first edge; 2112 - first mounting portion; 2113 - first reinforcement rib; 2121 - second edge; 2122 - second mounting portion;

[0099] 300-cell unit;

[0100] 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 portion; 4113 - raised portion; 4114 - end plate;

[0101] 500-connection structure; 501-mounting channel; 510-first connection structure; 520-second connection structure; 511-lifting ear assembly; 511a-port; 5111-lifting ear; 5112-bushing; 5113-sealing plug; 5114-second sealing member; 5115-third sealing member; 5116-fourth sealing member; 5111a-first step; 5111b-second step; 5111c-first connecting section; 5111d-second connecting section; 5111e-third connecting section; 5112a-bushing cavity; 5112b-flange;

[0102] 600-body seal;

[0103] 700-structural adhesive layer;

[0104] 10-chassis; 11-frame; 11a-girder; 11b-crossbeam; 11c-mounting hole; 11b1-left crossbeam; 11b2-middle beam; 11b3-right crossbeam;

[0105] 20 - battery pack; 21 - left short side; 22 - right short side; 23 - first sub-area; 24 - second sub-area; 25 - third sub-area; 26 - fourth sub-area; 27 - receiving chamber. DETAILED DESCRIPTION

[0106] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0107] The embodiment of the present application provides a battery pack and an electrical device including the battery pack, wherein the electrical device includes an electrical device, and the battery pack can provide electrical energy to the electrical device. In the embodiment of the present application, the electrical device can be a vehicle. Based on the design of the battery pack in the embodiment of the present application, the vehicle has stronger power performance and power stability. The vehicle can be a new energy vehicle (New Energy Vehicle), such as a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; abbreviated as: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; abbreviated as: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; abbreviated as: HEV), a fuel cell electric vehicle), and the vehicle can also be any vehicle with a battery.

[0108] With the rapid development of new energy vehicle technologies, on-board battery packs are also undergoing a rapid development phase. An on-board battery pack refers to a battery structure that can be installed on a vehicle and provide kinetic energy for the vehicle. From a technological 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, battery cells need to be integrated into modules, which are then assembled into a battery pack before the battery pack is installed on the vehicle. This first-stage battery pack features highly directional installation, with distinct structural layers. The second stage is the CTP (Cell to Pack) stage. In this stage, battery cells can be directly assembled into a battery pack without the need for module assembly. This second-stage battery pack offers several advantages, including reduced cost, improved installation efficiency, and increased capacity. The third stage is CTB (Cell to Body), which is another technological evolution of CTP. In this stage, the battery pack is directly formed by individual battery cells, and the battery pack cover becomes a part of the vehicle as the vehicle floor. The battery pack of the third stage omits the process of integrating battery cells into modules and part of the vehicle structure, so it can further reduce the cost of the whole vehicle, further improve the installation efficiency of the whole vehicle, and further increase the battery pack capacity and other advantages.

[0109] During the three stages described above, the battery pack can be installed on the vehicle's chassis. The structural strength and rigidity of the chassis significantly impact the overall vehicle performance, and the quality of the chassis design impacts the vehicle's driving performance, comfort, force transmission, and vibration resistance. It's clear that adding a battery pack to the chassis will damage the chassis's inherent structure and performance. To minimize this damage, the battery pack's strength and rigidity must be designed, as well as the connection between the battery pack and the chassis. This ensures that the inherent performance of the chassis is not affected after the battery pack is installed. It's understandable that, based on this, the adoption of reasonable design methods can even improve the performance of the chassis and battery pack to a certain extent.

[0110] The main difficulty in implementing CTB technology on vehicles lies in the connection design 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 the battery pack and the vehicle. The latter is mainly reflected in the sealing design of the battery pack itself and the sealing design between the battery pack and the vehicle. In terms of connection design, not only does the battery pack itself need to have sufficient strength and rigidity, but it also needs to form sufficient connection strength and rigidity between the battery pack and the vehicle. Based on strength and rigidity considerations, the battery pack under the CTB architecture usually needs to be designed with a tray, which plays the role of supporting each battery cell unit. The tray is designed with an intermediate crossbeam that plays a role of strength support and rigidity extension. The tray can be connected to the vehicle through the intermediate crossbeam. The design of the intermediate crossbeam will occupy the space in the tray, reducing the space utilization of the battery cell unit, thereby affecting the capacity of the battery pack. In terms of sealing design, when connecting to the vehicle through the intermediate crossbeam, relevant structures are required to achieve sealing of the battery pack connection. There are problems with complex structure and difficult to ensure sealing performance.

[0111] In summary, current CTB-based battery packs typically require a tray with a central crossbeam due to considerations such as strength and rigidity. This tray configuration results in design flaws in connection, sealing, and connection processes. Specifically, the tray reduces the space utilization of the battery cells, thus affecting the pack's capacity. Furthermore, sealing the pack or the space between the pack and the vehicle is difficult to achieve due to the complex structure, making sealing performance difficult to guarantee. This further complicates battery pack installation.

[0112] Based on the above status quo and problems, an embodiment of the present application provides a battery pack, which has a trayless structure as a whole and can form a stable and independent structure before being installed on a vehicle, thereby reducing the difficulty of installing the battery pack and completing the sealing of the battery pack before installing it on the vehicle, thereby simplifying the structure and improving the sealing performance.

[0113] In addition, the battery pack in the embodiment of the present application transfers the structural components that provide strength support and rigidity extension from the inside to the outside, which can provide more accommodation space for the battery cell units. The battery cell units can fill the internal space of the battery pack, thereby improving the space utilization of the battery cell units and thus increasing the capacity of the battery pack.

[0114] It is understandable that since the battery pack transfers its structural components that provide main strength support and rigidity extension from the inside of the battery pack to the outside of the battery pack, the structural components need to have excellent strength, rigidity and installability. To this end, the embodiments of the present application can ensure the strength and rigidity of the structural components through structural design, material selection and process design, and can also control costs.

[0115] The mountability of the above-mentioned structural component indicates that the structural component can be assembled to the vehicle, for example, it can be assembled to the frame of the chassis. After the installation is completed, the required strength and rigidity can be formed between the vehicle and the battery pack based on the setting of the structural component.

[0116] The battery pack in the embodiment of the present application can be applied to some vehicles such as the above-mentioned new energy vehicles. Taking the new energy vehicle as an example, in order to adapt to the above-mentioned battery pack, its related structures can be designed. For example, a chassis is usually set at the bottom of the new energy vehicle, and the chassis may include a frame. The frame may include two beams set at intervals and in parallel. Multiple cross beams can be set between the two beams as needed. Three or more cross beams can be set. The three cross beams can be a front seat cross beam, a middle cross beam and a rear seat cross beam.

[0117] The battery pack can be installed on the chassis. Specifically, the above-mentioned structural components of the battery pack can be connected to the chassis beam and crossbeam. Based on the strength, rigidity and installability of the structural components, the chassis and battery pack can be unified in structure and performance, which is conducive to improving the overall performance of the vehicle.

[0118] Figure 1 A schematic diagram of the installation of a battery pack and a chassis of a vehicle provided in accordance with an embodiment of the present application is shown; Figure 2 A schematic diagram of the installation of a battery pack for a vehicle provided in accordance with an embodiment of the present application is shown.

[0119] In an embodiment of the present application, the vehicle includes a chassis 10 and a battery pack 20. The chassis 10 includes the above-mentioned frame 11. The frame 11 includes a beam 11a and a cross beam 11b. The cross beam 11b is connected between the two beams 11a. Specifically, welding can be used to connect the cross beam 11b and the beam 11a into one.

[0120] The battery pack 20 can form an independent and stable structure before being installed on the vehicle frame 11. The battery pack 20 can be sealed before being installed on the vehicle frame 11, which can reduce the difficulty of installing the battery pack 20. It can also complete the sealing of the battery pack 20 before installing the battery pack 20 on the vehicle, which can simplify the structure and improve the sealing performance.

[0121] The frame 11 is provided with mounting holes 11c on the main beam 11a and the cross beam 11b. Correspondingly, the battery pack 20 is provided with a connecting structure 500 at a 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.

[0122] For example, in some embodiments, the first connection structure 510 can be set corresponding to the crossbeam 11b, and the second connection structure 520 can be set corresponding to the beam 11a. Based on the connection relationship between the battery pack 20 and the vehicle, that is, the considerations of the connection design mentioned above, the first connection structure 510 and its surroundings can be composed of a structure with excellent strength and rigidity, and the second connection structure 520 can adopt an ordinary connection structure 500, for example, the bolt ear 5111 structure commonly used in the vehicle-mounted battery pack 20.

[0123] In some embodiments, a first connection structure 510 may also be provided at a position on the battery pack 20 corresponding to the beam 11 a , thereby improving the connection strength between the battery pack 20 and the vehicle.

[0124] It should be noted that the number of connection structures 500 can be set according to actual needs based on the dimensional relationship between the vehicle frame 11 and the battery pack 20. For example, corresponding to the main beam 11a, 17 connection structures 500 can be set at the edge of the battery pack 20, wherein multiple connection structures 500 can be set on each of the two short sides of the battery pack 20, which can be 4, 5, etc. For example, 4 connection structures 500 are set on one short side, 5 connection structures are set on the other short side, and 4 connection 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 connection structures 500 can be varied, such as 8, 12, or other values, and the number of connection structures 500 on each long and short side can also be varied. In addition, corresponding to the crossbeam 11b, 4 or other values ​​of connection structures 500 can be set at the corresponding positions of the battery pack 20.

[0125] Figure 3 A schematic diagram of the arrangement of a connection structure 500 of a battery pack provided according to an embodiment of the present application is shown.

[0126] by Figure 1 and Figure 3Taking the orientation shown 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 is provided with 4 or 5 connecting structures 500 on its short sides, and along the Y direction, the battery pack 20 is provided with 4 connecting structures 500 on its long sides, and 4 connecting structures 500 are provided at the positions of the battery pack 20 located between the two short sides and corresponding to the three crossbeams 11b.

[0127] In an embodiment of the present application, the battery pack 20 can achieve a stable connection between the battery pack 20 and the vehicle by setting different numbers or matching 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.

[0128] In addition, multiple connection structures 500 can divide the area where the battery pack 20 is located into several sub-areas. When the above-mentioned 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 rigidity of the connection between the battery pack 20 and the vehicle.

[0129] Specifically, you can refer to Figure 1 and Figure 2 For ease of description, along the X-direction, the three crossbeams 11b on the vehicle frame 11 are the left crossbeam 11b1, the middle crossbeam 11b2, and the right crossbeam 11b3. The short sides of the battery pack 20 are the left short side 21 and the right short side 22. The connecting structures 500 corresponding to the left short side 21 and the left crossbeam 11b1 form a first sub-region 23. The connecting structures 500 corresponding to the left crossbeam 11b1 and the middle crossbeam 11b2 form a second sub-region 24. The connecting structures 500 corresponding to the middle crossbeam 11b2 and the right crossbeam 11b3 form a third sub-region 25. The connecting structures 500 corresponding to the right crossbeam 11b3 and the right short side 22 form a fourth sub-region 26. In the four sub-regions described above, taking the first sub-region 23 as an example, when the left short side 21 is struck by a hard object or other impact force, the impact force is rapidly transmitted along the left short side 21 and the various connecting structures 500 to the long side or the connecting structure 500 corresponding to the left crossbeam 11b1. This shortens the force transmission path and moment arm, thereby rapidly dissipating the impact force and significantly improving the rigidity of the battery pack 20 (the modal frequency of the battery pack 20 can reach above 80 Hz). Similarly, the connection force generated in the first sub-region 23 can also be quickly dispersed through the left short side 21, the long side, the connecting structure 500, and so on.

[0130] 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 mount the battery pack 20 on the frame 11.

[0131] Figure 4 A schematic diagram of an explosion of a battery pack provided according to an embodiment of the present application is shown; Figure 5 A schematic structural diagram of a first substrate provided according to an embodiment of the present application is shown; Figure 6 A schematic structural diagram of a first substrate provided by an embodiment of the present application from another angle is shown; Figure 7 An exploded schematic diagram of a first substrate provided according to an embodiment of the present application is shown.

[0132] In the examples of this application, please refer to Figures 4 to 7 The battery pack 20 in the embodiment of the present application includes a first base 100 , a second base 200 and a battery cell unit 300 .

[0133] The first substrate 100 is the structural component introduced above. The first substrate 100 has excellent strength, rigidity and installability. The first substrate 100 is configured to be connectable to the vehicle frame 11. The first substrate 100 has a force transmission structure 400 formed from its interior to the edge of the first substrate 100.

[0134] After the battery pack 20 is connected to the vehicle frame 11 , the first base 100 is connected to the vehicle frame 11 , and the second base 200 is located below the first base. The first base 100 can serve as an upper cover structure for the battery pack 20 .

[0135] 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 and the impact force when the battery pack 20 is subjected to external impact can be transmitted along the force transmission structure 400.

[0136] The force transmission structure 400 here is formed from the inside of the first substrate 100 to the edge of the first substrate 100. Combined with the foregoing, the inside of the first substrate 100 is a structure corresponding to the battery pack 20 located between the left short side 21 and the right short side 22. A connecting structure 500 corresponding to the crossbeam 11b is provided on this part of the structure. The edge of the first substrate 100 is located at a structure corresponding to the long side or short side of the battery pack 20. A connecting structure 500 corresponding to the beam 11a is provided on this part of the structure. Therefore, the force transmission structure 400 is set to be formed from the inside of the first substrate 100 to the edge. The connection force and impact force of the internal area of ​​the first substrate 100 can be transmitted from the inside and dispersed to the edges of the first substrate 100 and the frame 11. The connection force and impact force can also be transmitted in the opposite direction, so that the first substrate 100 has excellent structural strength and rigidity from its inside to its edge. After the first substrate 100 is force-connected to the frame 11, excellent connection strength and rigidity can also be formed between the frame 11 and the battery pack 20.

[0137] In an embodiment of the present application, in order to enable the first substrate 100 to form the above-mentioned force transmission structure 400 from its inside to the edge, the force transmission structure 400 can be formed on the outside of the first substrate 100, or on the inside of the first substrate 100, or the force transmission structure 400 can be formed on both the outside of the first substrate 100 and the inside of the first substrate 100. The above three methods of forming the force transmission structure 400 will be explained in detail in the following embodiments.

[0138] In addition, the force transmission structure 400 can be other structures arranged on the first substrate 100, and the force transmission structure 400 can also be formed by the structure of the first substrate 100 itself. These two ways of forming the force transmission structure 400 will also be explained in detail in the following embodiments.

[0139] The second substrate 200 is sealed and connected to the first substrate 100 to form a receiving cavity 27 (see 9 ). The battery cell unit 300 can be disposed in the receiving cavity 27 , and at least part of the battery cell unit 300 is connected to the first substrate 100 .

[0140] The battery pack 20 adopts a sealed connection between the first base 100 and the second base 200, so that the battery pack 20 as a whole can be sealed before being connected to the frame 11, and an independent and stable battery pack 20 structure can be formed, which helps to simplify the assembly of the battery pack 20 and achieve effective sealing.

[0141] At least part of the battery cells 300 are connected to the first base 100 , and the second base 200 only needs to support part of the weight of the battery cells 300 , or even no weight at all. The second base 200 can be designed to be lightweight, further improving the energy density of the battery pack 20 .

[0142] The present application does not limit the specific type of battery cell 300. In some embodiments, the battery cell 300 may be a blade-type battery. In addition, the battery cell 300 may be placed independently in the receiving cavity 27, or multiple battery cell units 300 may be arranged in the receiving cavity 27 in a module.

[0143] In combination with the following embodiments, it can be appreciated that the main function of the second base 200 in the embodiments of the present application is to form a seal with the first base 100, thereby achieving overall sealing of the battery pack 20. The second base 200 can also integrate other structural components of the battery pack 20. For example, the cold plate 210, the distribution box 220, etc. can be integrated into the second base 200.

[0144] In order to achieve sealing between the first substrate 100 and the second substrate 200, bolts or other connecting parts can be set at the edges of the first substrate 100 and the second substrate 200 and combined with sealing rings to achieve sealing, or welding can be used to form a full circle weld to ensure the sealing effect between the first substrate 100 and the second substrate 200.

[0145] Furthermore, an insulating structure may be provided between the first substrate 100 and the second substrate 200 to provide insulation therebetween. The insulating structure may be an insulating tape or a layer of insulating material. Alternatively, an insulating film such as a PI film may be attached to the ends of the battery cells 300. This not only provides insulation but also prevents heat transfer between the battery cells 300, thereby improving the safety of the battery pack 20.

[0146] The battery pack 20 in the embodiment of the present application is based on the setting of the force transmission structure 400 on the first substrate 100. The force transmission structure 400 enables the first substrate 100 to have excellent structural strength and rigidity from its interior to its edge. The strength and rigidity of the first substrate 100 are sufficient to bear the connection between the first substrate 100 and the frame 11, the connection between the first substrate 100 and the second substrate 200, and the connection between the first substrate 100 and the battery cell unit 300, so that there is no need to set up the intermediate cross beam 411 and other structures in the traditional technology in the battery pack 20, and more accommodation space can be provided for the battery cell unit 300. The battery cell unit 300 can fill the internal space of the battery pack 20, thereby improving the space utilization of the battery cell unit 300, thereby improving the capacity of the battery pack 20.

[0147] In addition, the sealing design based on the second base 200 and the first base 100 can improve the 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 difficulty of installing the battery pack 20. It can also complete the sealing of the battery pack 20 before installing the battery pack 20 on the vehicle, which can simplify the sealing structure and improve the sealing performance.

[0148] In some embodiments, please refer to Figure 5 and Figure 7 The first base 100 includes a base plate assembly 110 , and the force transmission structure 400 includes a first force transmission structure 410 connected to one side of the base plate assembly 110 .

[0149] The first force transmission structure 410 is one of the force transmission structures 400 . Combined with the foregoing, the first force transmission structure 410 is formed on the outside of the first base 100 and adopts other structural forms. The first force transmission structure 410 can improve the strength and rigidity of the substrate assembly 110 .

[0150] The substrate assembly 110 can be designed to be roughly rectangular in structure. Corresponding to the rectangular battery pack 20, the first force transmission structure 410 can be formed on the side of the first base 100 facing away from the second base 200. This can improve the strength and rigidity of the first base 100 while avoiding occupying the internal space of the battery pack 20.

[0151] In some embodiments, please refer to Figure 5 and Figure 7 The first force transmission structure 410 includes a plurality of beams 411 arranged along the width direction of the first base body 100 , and the plurality of beams 411 are spaced apart and arranged in parallel on the base plate assembly 110 .

[0152] The number of the cross beams 411 can be set according to the number of the cross beams 11b. Figure 1 and Figure 3 In the illustrated embodiment, the vehicle frame 11 includes three cross beams 11b. Accordingly, the first force transmission structure 410 may also include three cross beams 411, with the cross beams 411 corresponding to the positions of the cross beams 11b. In other embodiments, when the number of cross beams 11b changes, the number of cross beams 411 may also change accordingly.

[0153] like Figure 5As shown, 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 of the substrate assembly 110 (the long side of the substrate assembly 110) is subjected to the aforementioned connection force and impact force, the connection 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.

[0154] It can be understood that the spacing distance between the crossbeams 411 can be designed to adapt to the distance between the crossbeams 11b. Taking three crossbeams 411 as an example, the crossbeam 411 corresponding to the middle beam 11b2 can be set at a position roughly in the middle of the substrate assembly 110, and the other two crossbeams 411 can be set as the crossbeam 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 an asymmetrical distribution can be adopted.

[0155] In some embodiments, please refer to Figure 5 The crossbeam 411 is a solid structure, thereby improving the strength of the substrate assembly 110 .

[0156] In some embodiments, the beam 411 is designed to have a first cavity 4111, so that when the substrate assembly 110 is subjected to an action force, the beam 411 having the first cavity 4111 can provide a certain elastic support for the substrate assembly 110. When the substrate assembly 110 is subjected to the above-mentioned action force, the substrate assembly 110 can better transmit the action force, and can also buffer or weaken the action force, so that the beam 411 having the first cavity 4111 can enhance the rigidity of the substrate assembly 110.

[0157] In some embodiments, please refer to Figure 5 and Figure 7 The crossbeam 411 may adopt a combination of a solid structure and a hollow structure, so that the base plate assembly 110 can achieve a balance between strength and rigidity.

[0158] To form the first cavity 4111 , the beam 411 may include a third support portion 1323 and a protrusion 4113 . The third support portion 1323 is connected to the substrate assembly 110 . The protrusion 4113 is connected to the third support portion 1323 to form the first cavity 4111 .

[0159] The beam 411 is an overall arched structure and is arranged on the side of the first base 100 facing away from the second base 200. The protrusion 4113 protrudes from the surface of the first base 100 to form a first cavity 4111. The third support portion 1323 extends outward from the edge of the protrusion 4113. The third support portion 1323 can increase the contact area between the beam 411 and the substrate assembly 110, thereby improving the connection strength between the two.

[0160] The specific structure of the third support portion 1323 is not limited. For example, Figure 5 In the example shown, 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 wavy structure, etc., and even a lateral structure that can realize lateral transmission of force can be provided on the third support portion 1323. The lateral structure can be provided perpendicular to the third support portion 1323.

[0161] The specific structure of the protrusion 4113 is not limited. For example, Figure 5 In the example shown, the cross-section of the raised portion 4113 is a rectangular structure. In other embodiments, the raised portion 4113 can also be designed as an arc-shaped structure or a wavy structure, for example, the side wall of the raised portion 4113 can be bent, etc.

[0162] In some embodiments, please refer to Figure 5 Openings are formed at both ends of the raised portion 4113, and the crossbeam 411 further includes end plates 4114, which are tiltedly arranged at the openings.

[0163] The crossbeam 411 is arranged on the substrate assembly 110 along the Y direction. The crossbeam 411 is provided with openings at both ends in the X direction. By providing inclined end plates 4114 at the openings, the above-mentioned force can be transmitted to the substrate assembly 110 along the end plates 4114, thereby improving the overall strength and rigidity of the first base 100.

[0164] It can be understood that the end plate 4114 tilted at the opening can extend the path from the beam 411 to the substrate, thereby extending the path for the force to be transmitted from the beam 411 to the substrate assembly 110, and can form a buffer transition between the beam 411 and the substrate assembly 110, thereby avoiding the problem of damage to the connection performance between the beam 411 and the substrate assembly 110 caused by excessive force and instantaneous transmission to the substrate assembly 110. For example, it can avoid the detachment between the beam 411 and the substrate assembly 110.

[0165] In some embodiments, the end plate 4114 may have a hollow structure or a solid structure, and an inclined structure that can achieve inclined transmission of the force may be provided on the end plate 4114 .

[0166] Of course, in other embodiments, the beam 411 may also leave openings at both ends thereof, that is, the end plates 4114 may not be provided at both ends of the beam 411 . In addition, the end plate 4114 may be arranged only at one end of the beam 411 .

[0167] Figure 8 Shown Figure 6 Partial cross-sectional view along AA direction.

[0168] In some embodiments, please refer to Figure 7 and Figure 8 A second cavity 101 is formed on at least part of the edge of the first substrate 100 , and the second cavity 101 forms a second force transmission structure 420 .

[0169] As one of the force transmission structures 400 , the second force transmission structure 420 is formed on the inner side of the first base 100 and adopts its own structure. The second force transmission structure 420 can enhance the strength and rigidity of the substrate assembly 110 .

[0170] It is understood that when the side of the first substrate 100 is subjected to the above-mentioned force, the provision of the second cavity 101 can provide the first substrate 100 with a certain degree of elastic support. When the first substrate 100 is subjected to the above-mentioned force, the first substrate 100 can better transmit the force, and can also buffer or weaken the force. The processed force with a smaller impact is then transmitted to other positions of the first substrate 100, thereby making the first substrate 100 with the second cavity 101 have better strength and rigidity. When the internal position of the first substrate 100 is subjected to the above-mentioned force, when the force is transmitted from the inside to the edge of the first substrate 100, due to the provision of the second cavity 101, the force can be better transmitted, and this part of the force can also be buffered or weakened by the action of the second cavity 101.

[0171] The second cavity 101 can be formed circumferentially at the edge of the first substrate 100 , and the second cavity 101 can also be selectively set at certain positions of the first substrate 100 . For example, the second cavity 101 can be set at a position corresponding to the beam 411 . Of course, the second cavity 101 can also be set at other positions of the first substrate 100 .

[0172] In some embodiments, please refer to Figure 7 and Figure 8 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 beam 411 can be connected to the second substrate 112 .

[0173] Here, the substrate assembly 110 is designed to include a first substrate 111 and a second substrate 112 , and 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.

[0174] It is understandable that the substrate assembly 110 using the above-mentioned split structure needs to form a seal between the first substrate 111 and the second substrate 112. To this end, a first seal 120 can be provided between the first substrate 111 and the second substrate 112. The first seal 120 can be made of materials such as rubber or silicone. The first seal 120 can be arranged in multiple circles 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 seal 120 between the first substrate 111 and the second substrate 112, sealing can also be achieved by providing a related sealing structure between the first substrate 111 and the second substrate 112. For example, the first substrate 111 and the second substrate 112 can be designed to have a structure that can be nested or interlocked with each other. In this case, combined with the above-mentioned first seal 120, the sealing effect can be improved.

[0175] In addition, the specific shape of the first seal 120 can be set according to the different shapes of the second substrate 112. Generally speaking, the first seal 120 can be set to a structure corresponding to the second substrate 112. Thus, the first seal 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 seal 120 or simplify the arrangement of the first seal 120.

[0176] In some embodiments, please refer to Figure 5 The crossbeam 411 divides the area where the substrate assembly 110 is located into a plurality of first areas 110 a . The second substrate 112 includes a plurality of area structures 1121 . Each area structure 1121 encloses a second area 112 a corresponding to the first area 110 a .

[0177] In combination with the foregoing, it can be understood that the first region 110a can be understood as corresponding to the sub-region in the foregoing text, and the second substrate 112 forms a plurality of regional structures 1121 according to the number and arrangement of the first regions 110a, and each regional structure 1121 forms a second region 112a corresponding to the first region 110a, and each regional structure 1121 can strengthen the corresponding first region 110a.

[0178] In combination with the foregoing, the first area 110a corresponds to the crossbeam 11b and the main beam 11a in the vehicle frame 11. The connection force between the vehicle and the battery pack 20 is mainly generated between the battery pack 20 and the crossbeam 11b or between the battery pack 20 and the main beam 11a. By setting the regional structure 1121 for the first area 110a, the force can be transmitted and dispersed in a targeted manner at the positions of the crossbeam 11b and the main beam 11a, which is beneficial to improving the strength and rigidity of the first matrix 100.

[0179] Combined with the above-mentioned setting of the first sealing member 120, the first sealing member 120 can be extended corresponding to the regional structure 1121, that is, according to the second region 112a formed by the regional structure 1121, the first sealing member 120 can be set between the first substrate 111 and the second substrate 112 and the first sealing member 120 can enclose a third region 120a corresponding to the second region 112a.

[0180] The above-mentioned first area 110a, second area 112a and third area 120a are all designed based on the frame 11. It can be understood that when the structure of the frame 11 changes, the structure and arrangement of the beam 411, the second substrate 112 and the first seal 120 may also change.

[0181] In some embodiments, please refer to Figure 7 The second substrate 112 includes an edge structure portion 1122 and an intermediate structure portion 1123. The edge structure portion 1122 is arranged along the circumferential direction, and the intermediate structure portion 1123 is arranged on the inner side of the edge structure portion 1122 to divide the edge structure portion 1122 into multiple second areas 112a. The edge structure portion 1122 and the intermediate structure portion 1123 surrounding the second areas 112a form a regional structure 1121.

[0182] The edge structure portion 1122 corresponds to the edge portion of the frame 11, for example, the edge structure portion 1122 can correspond to the beam 11a of the frame 11, and the intermediate structure portion 1123 corresponds to the middle portion of the frame 11, for example, the intermediate structure can correspond to the crossbeam 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 portion 1122 and the intermediate structure portion 1123 can adapt to the force transmission between the frame 11 and the battery pack 20, and can meet the strength and rigidity requirements of the first substrate 100 while saving the material of the second substrate 112 and simplifying the manufacturing process and cost of the second substrate 112.

[0183] It is understandable that the above-mentioned structural composition of the second substrate 112 is only for illustration. In other embodiments, the second substrate 112 can also be designed to include other structures. For example, the second substrate 112 itself can also have structures such as cavities, which can also play the role of transmitting the force.

[0184] In addition, in other embodiments, in addition to the double-layer structure formed by the first substrate 111 and the second substrate 112, the substrate assembly 110 can also form a three-layer structure or other structures. When the substrate assembly 110 forms a three-layer structure, the substrate assembly 110 can include a third substrate, etc.

[0185] In addition, the second cavity 101 may also be formed in the substrate assembly 110 by an integral molding method. For example, the substrate assembly 110 including the second cavity 101 may be manufactured by injection molding.

[0186] In some embodiments, please refer to Figures 5 to 8 A first recessed area 1111 is formed at an edge of the first substrate 111 , and / or a second recessed area 1124 is formed at an edge of the second substrate 112 .

[0187] In a specific design, the first recessed region 1111 may be formed only at the edge of the first substrate 111, or the second recessed region 1124 may be formed only at the edge of the second substrate 112. Of course, both the first recessed region 1111 and the second recessed region 1124 may be provided simultaneously. When the second substrate 112 is connected to the first substrate 111, the first substrate 111 and the second substrate 112 may form the aforementioned second cavity 101 at their edges due to the presence of the first recessed region 1111 or the second recessed region 1124.

[0188] In order to form the above-mentioned first recessed area 1111 and the second recessed area 1124, the first substrate 111 and the second substrate 112 can be formed by stamping, which has a simple process, high efficiency 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~1mm. The two are then connected as one through the above-mentioned first seal 120 and welding.

[0189] In some embodiments, please refer to Figures 5 to 8The first substrate 111 includes a first substrate 111 main body and a first extension portion 1113, the first extension portion 1113 is bent and extended outward from the edge of the first substrate 111 main body, and the first extension portion 1113 forms a first recessed area 1111; and / or, the second substrate 112 includes a second substrate 112 main body and a second extension portion 1126, the second extension portion 1126 is bent and extended outward from the edge of the second substrate 112 main body, and the second extension portion 1126 forms two recessed areas.

[0190] To ensure the connection strength between the first substrate 111 and the second substrate 112 and simplify manufacturing, taking the first substrate 111 as an example, the first substrate 111 can be designed to include a straight portion and a curved portion. The straight portion can form a large-area contact with the straight portion on the second substrate 112 to ensure connection strength, while the curved portion can form the first recessed area 1111. The main body of the first substrate 111 forms the above-mentioned straight portion, and the first extension 1113 can form the curved portion. When designing the first substrate 111, the flat plate structure can be stamped at the edge of the plate. After the first extension 1113 is formed 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 repeated here.

[0191] As can be seen from the following embodiments, the side of the first base 100 facing the second base 200 can be connected to the battery cell 300. That is, the battery cell 300 is arranged on the side of the first base 100 facing the second base 200. To provide space for the battery cell 300 and control the size of the battery pack 20, the first extension 1113 can be bent toward the side of the second base 200, thereby enclosing the battery cell 300 within the enclosed space formed by the first extension 1113 and the main body of the first substrate 111. To achieve mating with the first substrate 111, the second extension 1126 of the second substrate 112 can also be bent toward the side facing the second base 200, thereby ensuring a tighter connection between the first substrate 111 and the second substrate 112.

[0192] In the embodiment in which the first extension portion 1113 and the second extension portion 1126 are provided, it should be understood that the first extension portion 1113 can be formed by one bend or by multiple bends, and the second extension portion 1126 can be formed by one bend or by multiple bends. Therefore, the first extension portion 1113 and the second extension portion 1126 can be the second cavity 101 extending along the circumference of the first base body 100 and presenting a single-loop structure, or can be the second cavity 101 presenting a multi-loop structure.

[0193] In some embodiments, please refer to Figure 8The main body of the first substrate 111 and the first extension portion 1113 can be connected by an inclined arm 113, and the main body of the second substrate 112 and the second extension portion 1126 can be connected by an inclined arm 113. The inclined arm 113 can alleviate or weaken the transmission of the force, thereby improving the strength and rigidity of the first substrate 111 or the second substrate 112.

[0194] In some embodiments, an expandable filler may be provided in the second cavity 101 . The expandable filler may be a material capable of expanding, such as foam. By filling the second cavity 101 with the expandable filler, the strength and rigidity of the first substrate 100 may be improved.

[0195] The expansion filler, combined with the first sealant 120 and welding, 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 .

[0196] In combination with the above, in some embodiments, please refer to Figures 9 to 11 The battery pack 20 further includes a connecting structure 500 disposed at an edge of the first base 100. The connecting structure 500 forms a mounting channel 501 that can engage with the mounting hole 11c on the vehicle frame 11, thereby enabling the first base 100 to be mounted to the vehicle frame 11 using fasteners such as bolts. It is understood that the connecting structure 500 may be the first connecting structure 510 or a combination of the first connecting structure 510 and the second connecting structure 520.

[0197] Here, the connecting structure 500 is arranged at the edge of the first substrate 100. Combined with the second cavity 101 formed at the edge of the first substrate 100, the second cavity 101 can form a peripheral structure of the connecting structure 500. The second cavity 101 serves as a force transmission structure 400, which 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 enhance the strength and rigidity of the first substrate 100. After the first substrate 100 is connected to the frame 11, the strength and rigidity requirements between the frame 11 and the first substrate 100 can also be met.

[0198] It should be understood that the connection structure 500 provided at the edge of the first substrate 100 needs to be understood based on the specific location of the second cavity 101. In combination with the above, the second cavity 101 can be formed along the circumferential edge of the first substrate 100, or the second cavity 101 can be formed at a certain location of the first substrate 100. Therefore, when the connection structure 500 is provided 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 second cavity 101 does not exist at the location where the connection structure 500 is provided, the combination of the connection structure 500 and the first substrate 100 mainly serves to strengthen the structural strength of the first substrate 100. Of course, in other embodiments, in order to meet the stiffness requirements of force transmission, a force transmission structure 400 can also be provided on the first substrate 100 corresponding to the connection structure 500, such as the first force transmission structure 410 described above.

[0199] For the sake of convenience of description, the connecting structure 500 arranged in the second cavity 101 is defined as a first connecting structure 510, and the connecting structure 500 arranged at the location of the first substrate 100 where the second cavity 101 is not formed is defined as a second connecting structure 520. In combination with the foregoing, 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 first substrate 100, and the combination of the second connecting structure 520 and the first substrate 100 can improve the strength of the first substrate 100. In addition, combined with the setting of other force transmission structures 400, the combination of the second connecting structure 520 and the first substrate 100 can meet the requirements of strength and rigidity.

[0200] In the embodiments of the present application, combined with the foregoing, it should be recognized that the number and arrangement relationship of the first connecting structures 510 and the second connecting structures 520 can be selected according to actual needs. For example, in some cases, the first connecting structures 510 can be used and arranged in a circle along the circumference of the first base body 100. For another example, in some cases, the first connecting structures 510 and the second connecting structures 520 can be arranged in an alternating manner along the circumferential direction of the edge of the first base body 100. Combined with the above embodiments, it can be seen that in the embodiment where the first force transmission structure 410 formed by the crossbeam 411 is provided, the first connecting structures 510 and the second connecting structures 520 can also be arranged according to the position of the crossbeam 411.

[0201] In some embodiments, please refer to Figure 5 , the first connecting structure 510 is correspondingly arranged at the end of the beam 411 .

[0202] In combination with the above, the function of the crossbeam 411 is to form a connection with the crossbeam 11b on the frame 11. The crossbeam 411 is the part on the first base 100 that needs to be connected to the frame 11, and the crossbeam 411 is located in the internal position of the first base 100. The stress concentration effect on the crossbeam 411 is more significant. In order to alleviate the influence of stress, in addition to adopting the structural design such as the hollow structure described in the above, the crossbeam 411 can also set the first connecting structure 510 correspondingly at the end of the crossbeam 411, so that in the process of transmitting the connection force and impact force of the crossbeam 411, the combination of the first connecting structure 510 and the second cavity 101 can act correspondingly to the crossbeam 411, so that the above-mentioned force can be quickly diverged or weakened when it is transmitted along the crossbeam 411 to the first connecting structure 510 and the second cavity 101, thereby improving the strength, rigidity and installability of the first base 100 from the crossbeam 411 to the edge.

[0203] It is understood that the cross beam 411 mainly serves to connect with the vehicle frame 11 , and to ensure the connection strength, a second connection structure 520 may be provided on the cross beam 411 . Of course, the first connection structure 510 may also be provided on the cross beam 411 .

[0204] Figure 9 A cross-sectional view of a battery pack provided according to an embodiment of the present application is shown; Figure 10 Shown Figure 9 A magnified view of the part B in the middle.

[0205] In some embodiments, please refer to Figure 9 and Figure 10 The first connection structure 510 includes a lifting ear component 511 inserted into the second cavity 101. The lifting ear component 511 has a port 511a. The lifting ear component 511 forms the installation channel 501. The outer wall surface of the lifting ear component 511 is connected to the first substrate 111 and the second substrate 112.

[0206] The port 511a is formed at one end of the lifting ear assembly 511 corresponding to the frame 11, and the mounting channel 501 can be connected to the mounting hole 11c on the frame 11. After fasteners such as bolts are sequentially installed into the mounting channel 501 and the mounting hole 11c, the connection between the first base 100 and the frame 11 can be achieved.

[0207] The ear assembly 511 can be connected to the first substrate 111 and the second substrate 112 by welding. During design, a welding opening 1114 that can accommodate the ear assembly 511 can be formed on the first substrate 111 and the second substrate 112. Before welding, the ear assembly 511 can be installed at the welding opening 1114 and the outer wall of the ear assembly 511 can be abutted against the edges of the first substrate 111 and the second substrate 112. Then, the connection between the ear assembly 511 and the first base 100 can be achieved by laser welding between the two.

[0208] In order to ensure connection reliability and prevent the ear assembly 511 from being separated from the first base 100 , a limiting structure may be formed between the ear assembly 511 and the first base 100 .

[0209] For example, see Figure 10 In some embodiments, the ear assembly 511 may include an ear 5111 , wherein a first step 5111 a is formed at a position of the ear 5111 corresponding to the first substrate 111 , and a second step 5111 b is formed at a position of the ear 5111 corresponding to the second substrate 112 .

[0210] The first step 5111a can be snapped into the edge of the above-mentioned welding opening 1114 of the first substrate 111. The first step 5111a can limit the lifting ear 5111 below the lifting ear 5111 to prevent the lifting ear 5111 from passing through the welding opening 1114 on the first substrate 111. The second step 5111b can limit the lifting ear 5111 above the lifting ear 5111 to prevent the lifting ear 5111 from passing through the welding opening 1114 on the second substrate 112.

[0211] In some embodiments, please refer to Figure 10 The ear 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 the first connecting segment 5111c forms a first step 5111a. The second connecting segment 5111d corresponds to the second substrate 112, and the second connecting segment 5111d 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 greater 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.

[0212] Therefore, the ear 5111 has a stepped structure in appearance, and the first connecting section 5111c can extend out of the above-mentioned welding opening 1114 to form the port 511a of the ear assembly 511. The first connecting section 5111c can transition to the second connecting section 5111d through the inclined third connecting section 5111e. The third connecting section 5111e and the second connecting section 5111d are in an outward-expanding structure relative to the first connecting section 5111c. The third connecting section 5111e and the first connecting section 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 first base body 100 and the ear 5111.

[0213] In the above structure, at least part of the outer wall of the third connecting section 5111e is inclined, which can extend the transmission time of the above force between the ear 5111 and the first base 100, thereby reducing the impact of the force on the first base 100 and the ear 5111.

[0214] In some embodiments, please refer to Figure 10 The ear assembly 511 also includes a bushing 5112, which is arranged in the mounting channel 501. The bushing 5112 extends from one side of the first substrate 111. The bushing 5112 has a bushing cavity 5112a that is connected to the mounting channel 501. A gap is formed between the bushing 5112 and the first substrate 111, and a portion of the second base body 200 can be confined in the gap.

[0215] In conjunction with the foregoing, the function of the second substrate 200 is to form a seal with the first substrate 100. It is understandable that, in a specific design, a seal can be formed between the first substrate 111 and the second substrate 200. The bushing 5112 extending from one side of the first substrate 111 can extend the length of the mounting channel 501, making it easier to pass fasteners such as bolts through the bushing cavity 5112a and into the mounting channel 501, thereby simplifying the bolt connection operation. In addition, by forming a gap between the bushing 5112 extending from the first substrate 111 and the first substrate 111, the second substrate 200 is confined within the gap, which can improve the connection strength and reliability between the second substrate 200 and the first substrate 100, making the battery pack 20 more compact in structure.

[0216] In order to form the above-mentioned gap, a circle of flange 5112 b can be provided on the outer wall of the bushing 5112 , and the flange 5112 b can form the above-mentioned gap with the first substrate 111 .

[0217] In some embodiments, please refer to Figure 10 The lifting ear assembly 511 further includes a sealing plug 5113, which is sealed in the bushing cavity 5112a.

[0218] The function of the sealing plug 5113 is to seal the installation channel 501 so that after the first substrate 100 or the battery pack 20 is connected to the vehicle frame 11 by bolts, the sealing plug 5113 can protect the internal environment of the installation channel 501, for example, preventing dust, water vapor, etc. from entering the installation channel 501.

[0219] As can be seen from the above, the lug 5111 is formed with a port 511a. The lug 5111 needs to be connected to the frame 11. To ensure the connection effect and to form a seal between the frame 11 and the lug 5111, a second sealing member 5114 can be provided between the lug 5111 and the frame 11. Figure 10 The second sealing member 5114 can be an O-ring supported by silicone, etc.

[0220] For the lifting ear 5111 and the bushing 5112, as well as the bushing 5112 and the sealing plug 5113, in order to improve the sealing effect, a second base 200 can also be set respectively. For example, a third seal 5115 can be set between the lifting ear 5111 and the bushing 5112, and a fourth seal 5116 can be set between the bushing 5112 and the sealing plug 5113. These second bases 200 can be O-rings or H-rings, etc., and this application does not impose any restrictions on this.

[0221] In some embodiments, please refer to Figure 10 The first connecting structure 510 has an outer side facing the edge of the first substrate 100 and an inner side facing the edge of the first substrate 100, and a reinforcement structure 114 is filled between the first substrate 111 and the second substrate 112. The reinforcement structure 114 is located on the outer side of the first connecting structure 510, or the reinforcement structure 114 is located on the inner and outer sides of the first connecting structure 510.

[0222] It can be understood 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 periphery, a reinforcement structure 114 can be set on the inside, or on both the inside and the outside. The insertion of the reinforcement structure 114 can prevent the first connecting structure 510 or the first substrate 100 corresponding to the first connecting structure 510 from being deformed due to excessive force.

[0223] In some specific embodiments, the reinforcement structure 114 can be formed by pouring glue on the inner and outer sides. For the inner side, the glue pouring can be performed before connecting the first connection structure 510 to the first substrate 100. For the outer side, the glue pouring can be performed after connecting the first connection structure 510 to the first substrate 100.

[0224] In some embodiments, please refer to Figure 5 The first substrate 111 and the second substrate 112 are bonded together at both ends in the length direction, or the second substrate 112 is retracted into the first substrate 111 along the length direction to form at least one single-layer structure portion at the end of the first substrate 111 that is not covered by the second substrate 112.

[0225] The length direction here can be Figure 5 In the X direction, the second connecting structure 520 is arranged at both ends of the first substrate 100 along the length direction, and the structural strength of the first substrate 100 can be strengthened at the ends. The fitting arrangement and the single-layer structure portion here are both positions where the second cavity 101 is not formed in the first substrate 100.

[0226] In the above-mentioned 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 can adopt the same structure, that is, both can include a lifting ear 5111, a bushing 5112, etc. In some embodiments, the second connecting structure 520 can also only be provided with a lifting ear 5111, or the second connecting structure 520 adopts a traditional form of the lifting ear 5111 structure.

[0227] In some embodiments, in order to achieve sealing between the battery pack 20 and the frame 11, a body sealing ring 600 can be set on the side of the first substrate 100 facing away from the second substrate 200. The body sealing ring 600 can be set on the second substrate 112, for example. The body sealing ring 600 has a closed annular structure and can form a seal between the first substrate 100 and the frame 11.

[0228] In some embodiments, please refer to Figure 5 and Figure 7 A structural adhesive layer 700 is provided on one side of the first substrate 100 facing the second substrate 200 , and the battery cell unit 300 is connected to the structural adhesive layer 700 .

[0229] The structural adhesive layer 700 can achieve the connection between the battery cell unit 300 and the first substrate 100. The connection between the battery cell unit 300 and the first substrate 100 can be used as a process for assembling the battery pack 20. This process can be carried out as follows: the first substrate 100 is placed on the assembly station so that the side of the first substrate 100 facing the second substrate 200 is facing upward, and then the structural adhesive is evenly coated on the first substrate 100 to form the structural adhesive layer 700. Then, the battery cell unit 300 is connected to the structural adhesive layer 700 according to the specified arrangement.

[0230] It can be understood that after completing the above process, the second base 200 can be connected to the first base 100. After completing the sealed connection between the second base 200 and the first base 100, the battery pack 20 can be formed. Then, the battery pack 20 can be flipped 180 degrees so that the first base 100 of the battery pack 20 is located above the second base 200. Then, the battery pack 20 is installed on the frame 11 through the connecting structure 500 to complete the installation of the battery pack 20.

[0231] In combination with the aforementioned embodiments of the first substrate 100, it can be seen that the force transmission structure 400 can be arranged on the outside of the first substrate 100, or formed by the first substrate 111 and the second substrate 112. The portion on the first substrate 100 for coating the structural adhesive can be a planar structure, thereby accurately controlling the thickness of the structural adhesive layer 700 and achieving thickness balance of the structural adhesive layer 700, which is beneficial to improving the connection reliability between each battery cell unit 300 and the structural adhesive layer 700 and achieving uniform performance of each battery cell unit 300.

[0232] In some embodiments, please refer to Figure 10 A glue groove 102 may be further provided on the first substrate 100 , and at least a portion of the structural glue layer 700 may be embedded in the glue groove 102 .

[0233] The provision of the adhesive groove 102 can increase the bonding force between the structural adhesive layer 700 and the first substrate 100 , thereby improving the connection stability between the structural adhesive layer 700 and the first substrate 100 .

[0234] In some embodiments, the glue groove 102 can be arranged around the periphery of the connecting structure 500. At this time, the glue groove 102 can act as a third force transmission structure 430. The third force transmission structure 430 is formed by the first base 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, and can improve the strength and rigidity of the connecting structure 500 and its surroundings.

[0235] Figure 11 A structural schematic diagram of a first expansion limiting structure provided according to an embodiment of the present application is shown.

[0236] In some embodiments, please refer to Figure 6 、 Figure 7 and Figure 11 The first substrate 100 further includes a first expansion limiting structure 130 , which is disposed on the substrate assembly 110 , and the battery cell unit 300 is confined between the first expansion limiting structures 130 .

[0237] The first expansion limiting structure 130 can be set at both ends of the length direction of the first substrate 100. When the battery pack 20 undergoes a charge and discharge cycle, the battery cell unit 300 will expand and contract to a certain extent. The first expansion limiting structure 130 can provide a buffer space for the expansion of the battery cell unit 300 to prevent the battery cell unit 300 from excessive expansion.

[0238] In some embodiments, please refer to Figure 11 The first expansion limiting structure 130 includes an expansion beam 131 and a support bracket 132 . The expansion beam 131 abuts against the battery cell unit 300 , and the support bracket 132 is supported on a side of the expansion beam 131 away from the battery cell unit 300 .

[0239] Supporting the expansion beam 131 by the support bracket 132 can prevent the expansion beam 131 from tilting, thereby improving the limiting effect of the expansion beam 131 on the battery cell unit 300.

[0240] In some specific embodiments, please refer 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. The inner beam 1312 is disposed within the third cavity 1311a. The third cavity 1311a forms a fourth force transmission structure 440. This fourth force transmission structure 440 is located between the battery cell 300 and the substrate assembly 110, enabling force transmission between the substrate assembly 110 and the battery cell 300. While ensuring that the expansion beam 131 limits the battery cell 300, it also enhances the strength and rigidity of the first substrate 100. Furthermore, by providing the inner beam 1312 within the third cavity 1311a, the structural strength of the expansion beam 131 is enhanced, preventing damage to the expansion beam 131.

[0241] In some specific embodiments, please refer to Figure 11 The supporting leg 132 includes a first supporting portion 1321, a second supporting portion 1322 and a third supporting portion 1323. The first supporting portion 1321 abuts against the expansion beam 131, the second supporting portion 1322 abuts against the substrate assembly 110, and the third supporting portion 1323 is connected between the first supporting portion 1321 and the second supporting portion 1322. The third supporting portion 1323 forms a fourth cavity.

[0242] 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, the fourth cavity can serve as a fifth force transmission structure to achieve the transmission of force between the expansion beam 131 and the substrate assembly 110. The provision of the fourth cavity can improve the rigidity of the first expansion structure. Of course, the first support portion 1321 and the second support portion 1322 can be provided with a fifth cavity 1321a therein, and the fifth cavity 1321a can form a sixth force transmission structure.

[0243] Figure 12 A schematic structural diagram of a cold plate provided according to an embodiment of the present application is shown.

[0244] In some embodiments, please refer to Figure 12 In order to prevent the expansion beam 131 from deformation or displacement, the first expansion structure can also include a block 133. The block 133 can be set on the second base 200. After the second base 200 is connected to the first base 100, the block 133 is located on the side of the expansion beam 131 away from the battery cell unit 300. The block is used to limit the expansion beam 131.

[0245] The stopper 133 can be provided on one side of the support leg 132 . The distance between the stopper 133 and the support leg 132 can be designed according to different requirements. In addition, the number of the stoppers 133 can also be selected according to requirements.

[0246] The stopper 133 may be a solid structure or a hollow structure. When the stopper 133 is a hollow structure, the internal structure may be designed similarly to the aforementioned expansion beam 131 .

[0247] It should be noted that the stopper 133 may abut against the expansion beam 131 or may be at a certain distance from the expansion beam 131 , thereby providing a controllable safety range for the deformation of the expansion beam 131 .

[0248] In addition to the above, the stopper 133 may also be provided on the first substrate 100 , or a portion of the stopper 133 may be provided on the second substrate 200 , and another portion of the stopper 133 may be provided on the first substrate 100 .

[0249] The above embodiments provide a detailed description of the first substrate 100 in the battery pack 20. It can be recognized that the first substrate 100 can have excellent strength, rigidity and installability based on the setting of the force transmission structure 400 and the combined design of the connecting mechanism and the force transmission structure 400. The design of the battery pack 20 based on the first substrate 100 can make the first substrate 100 serve as the main load-bearing component of the battery pack 20 and the third support part 1323 of the frame 11. Therefore, the battery cell unit 300 and the second substrate 200 can be assembled on the first substrate 100, thereby achieving the effects of the battery pack 20 in terms of capacity improvement, simplified assembly and simplified second substrate.

[0250] The above embodiments of the first substrate 100 mainly introduce the first substrate 100 and the force transmission structure 400 from the perspective of local design of the force transmission structure 400. In other embodiments, the possibility of designing the force transmission structure 400 may also be considered from an overall perspective.

[0251] For example, in some embodiments, the first base 100 can be designed as a whole to include a cavity, in which force-transmitting crossbeams 411 and force-transmitting longitudinal beams arranged in a criss-cross pattern can be set. The force-transmitting crossbeams 411 and force-transmitting longitudinal beams can enable a certain position of the first base 100 to be subjected to the above-mentioned connection force and impact force. The connection force and impact force can be transmitted to various positions of the first base 100 along the force-transmitting crossbeams 411 and the force-transmitting longitudinal beams, thereby meeting the strength, rigidity and installability requirements of the first base 100.

[0252] In some embodiments, please refer to Figure 12 The second base 200 includes a cold plate 210 , which is connected to the first base 100 and forms a receiving cavity 27 .

[0253] The function of the cold plate 210 is to dissipate heat for the battery cell units 300 . The cold plate 210 is provided with a flow channel, and the flow channel can span between the battery cell units 300 .

[0254] In conjunction with the foregoing, in some embodiments, a first recessed receiving area is formed on the side of the first base 100 facing the battery cell unit 300. For example, in the embodiment described above where the first base 100 includes a first substrate 111 and a second substrate 112, and the second substrate 112 includes a second substrate 112 body and a second extension 1126, the second substrate 112 body and the second extension 1126 can form the first recessed receiving area, and the battery cell unit 300 can be enclosed by the first recessed receiving area. To adapt to the above-mentioned structural shape of the first base 100, the cold plate 210 is formed with a second recessed receiving area at a position corresponding to the first recessed receiving area.

[0255] In some embodiments, please refer to Figure 12The cold plate 210 includes a heat evaporating plate 211 and a flow channel plate 212. The flow channel plate 212 is stacked with the heat evaporating plate 211. The heat evaporating plate 211 is close to the battery cells 300, allowing heat from the battery cells 300 to be quickly transferred to the heat evaporating plate 211. The flow channels provided on the flow channel plate 212 enable heat dissipation. Both the heat evaporating plate 211 and the flow channel plate 212 are designed as recessed structures that are recessed in a direction away from the first substrate 100.

[0256] The recessed structure can be adapted to the first substrate 100 , thereby expanding the internal space of the battery pack 20 and making the battery pack 20 more compact in structure.

[0257] In some embodiments, please refer to Figure 12 In the circumferential direction, a first edge 2111 is provided on the edge of the temperature equalizing plate 211, and in the circumferential direction, a second edge 2121 is provided on the edge of the flow channel plate 212. First mounting portions 2112 for connecting to the first substrate 100 are provided at intervals on the first edge 2111, and second mounting portions 2122 for connecting to the first substrate 100 are provided at intervals on the second edge 2121.

[0258] The first edge 2111 is the edge structure of the temperature averaging plate 211. In a specific design, the edge of the temperature averaging plate 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 temperature averaging plate 211 and the flow channel plate 212 can cooperate with each other through the first edge 2111 and the second edge 2121 to increase the contact area between the two, thereby improving the integrity of the cold plate 210. In addition, when the cold plate 210 is connected to the first base 100, the first mounting portion 2112 and the second mounting portion 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 first base 100, which is beneficial to improving the connection strength and connection reliability between the first base 100 and the cold plate 210.

[0259] In combination 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 first base 100 and the cold plate 210 , which is beneficial to the compact design of the battery pack 20 .

[0260] In some specific embodiments, the first mounting portion 2112 and the second mounting portion 2122 can be designed as structures such as threaded holes.

[0261] In some embodiments, please refer to Figure 12A first reinforcing rib 2113 is provided on the inner side of the temperature homogenizing plate 211, and a second reinforcing rib is provided on the inner side of the flow channel plate 212 at a position corresponding to 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.

[0262] In a specific design, the first reinforcing ribs 2113 can be evenly arranged on the temperature equalizing plate 211 along the circumferential direction, and the second reinforcing ribs can be evenly arranged on the flow channel plate 212 along the circumferential direction.

[0263] In some embodiments, the temperature homogenizing plate 211 is designed as a multi-layer structure, and two adjacent layers are made of different materials; the flow channel plate 212 is designed as a multi-layer structure, and two adjacent layers are made of different materials.

[0264] Using different materials to manufacture the temperature averaging plate 211 and the flow channel plate 212 and forming a layered structure can improve the strength and rigidity of the temperature averaging plate 211 and the flow channel plate 212. The combination of different materials and different layers is conducive to the transmission and dispersion of the force.

[0265] This application does not limit the specific materials of the temperature plate 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 temperature plate 211 can have a three-layer structure, and the flow channel plate 212 can have a four-layer structure. For example, the materials can be selected from high-strength aluminum.

[0266] The multi-layer structure of the temperature equalizing plate 211 and the flow channel plate 212 can be formed by cold rolling of plates. For example, by reasonably selecting different plates and then arranging the different plates in a stacked manner, the temperature equalizing plate 211 and the flow channel plate 212 can be formed through a suitable cold rolling process.

[0267] In order to improve the bonding strength between the temperature averaging plate 211 and the flow channel plate 212 , structures such as brazing layers can be set between different layers. The auxiliary brazing process can improve the structural strength of the temperature averaging plate 211 and the flow channel plate 212 .

[0268] In some embodiments, please refer to Figure 12 A plug-in base 213 is provided on the cold plate 210 , and the second base 200 further includes a distribution box 220 , which is provided on the cold plate 210 and connected to the plug-in base 213 .

[0269] It can be understood 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 and the like can be set in the distribution box 220 .

[0270] In some embodiments, a second expansion limiting structure may be provided on the cold plate 210 , and the second expansion limiting structure abuts against the battery cell unit 300 . The structure and function of the second expansion limiting structure may refer to the first expansion limiting structure 130 , and will not be described in detail.

[0271] In some embodiments, please refer to Figure 2 The second base 200 further includes a protection plate 230 , which is connected to the cold plate 210 and is located on a side of the cold plate 210 away from the first base 100 .

[0272] The protective plate 230 is a protective structure for the battery pack 20. When the battery pack 20 is installed on the frame 11, the protective plate 230 is located at the bottom of the battery pack 20 to prevent the battery pack 20 from being damaged by hard objects such as stones.

[0273] The protection plate 230 may be connected to the cold plate 210 by connecting members such as bolts, and the connecting members may be arranged circumferentially at the edge of the protection plate 230 .

[0274] In order to more clearly understand the structure and performance of the battery pack 20 in the embodiment of the present application, the following will be combined with Figure 2 To further describe a portion of the embodiments of the present application, in the embodiments described below, the battery pack 20 may include a first substrate 100, a structural adhesive layer 700, a battery cell unit 300, a second substrate 200, and a connection structure 500. The first substrate 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 have a second cavity 101 formed at their edges, serving as a second force transmission structure 420. A portion of the connection structure 500 is disposed in the second cavity 101. The connection structure 500 includes a bushing 5112 extending from the second substrate 112. The battery cell unit 300 is connected to the side of the first substrate 100 facing the second substrate 200 via the structural adhesive layer 700. The second base 200 includes a cold plate 210, a protective plate 230, and a distribution box 220 disposed on the cold plate 210. The cold plate 210 includes a temperature distribution plate 211 and a flow channel plate 212. The edge of the cold plate 210 can limit the gap between the second base plate 112 and the bushing 5112. In addition, the first base 100 and the cold plate 210 are both designed as recessed structures.

[0275] Among the above-mentioned components, the first substrate 111, the second substrate 112, the temperature equalizing plate 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 being suitable for mass production.

[0276] In the battery pack 20 described above, the first substrate 111 and the second substrate 112 can be connected by welding, the temperature averaging plate 211 and the flow channel plate 212 can also be connected by welding, the cold plate 210 and the first base 100 can be connected by fasteners such as bolts, and the protective plate 230 and the cold plate 210 can also be connected by fasteners such as bolts. 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 first base 100 and the cold plate 210, can make the battery pack 20 more compact, facilitate expansion of the internal space of the battery pack 20, reduce the overall weight of the battery pack 20, and improve the battery pack 20's endurance in the vehicle.

[0277] When assembling the battery pack 20, the first substrate 100 is placed on the workstation, the structural adhesive layer 700 is applied to the first substrate 100, and the battery cells 300 are installed. Finally, the cold plate 210 and protective plate 230 are installed. 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 flipped 180 degrees and then bolted into the connecting structure 500 to connect the battery pack 20 to the vehicle frame 11, achieving high installation efficiency.

[0278] During the assembly of the battery pack 20 and the installation of the battery pack 20 on the vehicle frame 11, it can be seen that the battery pack 20 can form an independent and stable structure before being installed on the vehicle frame 11, which can reduce the difficulty of installing the battery pack 20 and also achieve the sealing of the battery pack 20 before installing it on the vehicle, which can simplify the sealing structure and improve the sealing performance. In addition, based on the design of each force transmission structure 400 on the first base 100, the first base 100 can have sufficient strength and rigidity, and can serve as a load-bearing structure for supporting the battery cell unit 300, the cold plate 210, etc. The first base 100 is located on the outside of the battery pack 20, which can provide more accommodation space for the battery cell unit 300. The battery cell unit 300 can fill the internal space of the battery pack 20, thereby improving the space utilization of the battery cell unit 300 and thus increasing the capacity of the battery pack 20.

[0279] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships 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, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0280] In the description of this application, it should be understood that the terms "including" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0281] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration. They can be directly connected or indirectly connected through an intermediate medium. They can also refer to internal connections between two elements or interactions between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated.

[0282] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A first base body is configured to be at least connectable to a vehicle frame, wherein the first base body forms a force transmission structure from an interior thereof to an edge of the first base body; a second base body connected to the first base body and forming a receiving cavity; The battery cell unit is at least partially connected to the first substrate, and the battery cell unit is arranged in the receiving cavity.

2. The battery pack according to claim 1, wherein: The first substrate comprises: The base plate assembly, the force transmission structure includes a first force transmission structure connected to one side of the base plate assembly.

3. The battery pack according to claim 2, wherein: The first force transmission structure includes: A plurality of beams are arranged along the width direction of the first base body, and the plurality of beams are spaced apart and arranged in parallel on the base plate assembly.

4. The battery pack according to claim 3, wherein: The crossbeam is a solid structure.

5. The battery pack according to claim 3, wherein: The crossbeam is designed to have a first cavity.

6. The battery pack according to claim 5, characterized in that: The crossbeam comprises: a connecting portion connected to the substrate assembly; and a protruding portion connected to the connecting portion to form the first cavity.

7. The battery pack according to claim 6, characterized in that: Openings are formed at both ends of the raised portion, and the crossbeam further comprises: An end plate is arranged obliquely at the opening.

8. The battery pack according to claim 3, wherein: A second cavity is formed on at least a portion of the edge of the first substrate, and the second cavity forms a second force transmission structure.

9. The battery pack according to claim 8, characterized in that: The substrate assembly comprises: a first substrate; and a second substrate, wherein the second substrate is connected to the first substrate and forms the second cavity, and the beam is connected to the second substrate.

10. The battery pack according to claim 9, characterized in that: The crossbeam divides the area where the substrate assembly is located into a plurality of first areas, and the second substrate includes: A plurality of area structures are provided, each of the area structures enclosing a second area corresponding to the first area.

11. The battery pack according to claim 10, characterized in that: The second substrate includes: an edge structure portion, the edge structure portion being arranged along the circumferential direction; and an intermediate structure portion provided inside the edge structure portion to divide the edge structure portion into a plurality of second regions, the edge structure portion and the intermediate structure portion surrounding the second regions forming the region structure.

12. The battery pack according to claim 9, wherein: A first sealing member is disposed between the first substrate and the second substrate, and the first sealing member is extended and disposed corresponding to the regional structure.

13. The battery pack according to claim 9, wherein: A first recessed area is formed at an edge of the first substrate; and / or a second recessed area is formed at an edge of the second substrate.

14. The battery pack according to claim 13, wherein: The first substrate includes a first substrate body and a first extension portion, the first extension portion is bent and extended outward from the edge of the first substrate body, and the first extension portion forms the first recessed area; and / or the second substrate includes a second substrate body and a second extension portion, the second extension portion is bent and extended outward from the edge of the second substrate body, and the second extension portion forms the second recessed area.

15. The battery pack according to claim 8, wherein: The second cavity is filled with an expansion filler.

16. The battery pack according to claim 8, characterized in that: The battery pack further includes a connecting structure, which is disposed at an edge of the first substrate and forms a mounting channel.

17. The battery pack according to claim 16, wherein: The connecting structure includes a first connecting structure arranged in the second cavity, and the first connecting structure is arranged corresponding to the end of the beam.

18. The battery pack according to claim 17, characterized in that: The first connection structure includes a lifting ear component inserted into the second cavity, the lifting ear component has a port, the lifting ear component forms the installation channel, and the outer wall surface of the lifting ear component is connected to the first substrate and the second substrate.

19. The battery pack according to claim 18, wherein: The lifting lug assembly comprises: A lifting ear is provided with a first step at a position corresponding to the first substrate, and a second step at a position corresponding to the second substrate.

20. The battery pack according to claim 19, wherein: The lifting lugs include: a first connecting section, the first connecting section corresponding to the first substrate, the first connecting section forming the first step; a second connecting section, the second connecting section corresponding to the second substrate, the second connecting section 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 greater 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.

21. The battery pack according to claim 19, wherein: The lifting ear assembly further comprises: A bushing is arranged in the installation channel, the bushing extends from one side of the first substrate, the bushing has a bushing cavity connected to the installation channel, a gap is formed between the bushing and the first substrate, and a part of the second base is confined in the gap.

22. The battery pack according to claim 21, wherein: The lifting ear assembly further comprises: A sealing plug is sealed and connected in the bushing cavity.

23. The battery pack according to claim 19, wherein: A second sealing member is provided between the lifting eye and the vehicle frame.

24. The battery pack according to claim 22, wherein: A third sealing member is provided between the lifting ear and the bushing, and / or a fourth sealing member is provided between the bushing and the sealing plug.

25. The battery pack according to claim 18, wherein: The first connecting structure has an outer side facing the edge of the first base and an inner side facing away from the edge of the first base. A reinforcement structure is filled between the first substrate and the second substrate. The reinforcement structure is located on the outer side of the first connecting structure, or the reinforcement structure is located on the outer side and the inner side of the first connecting structure.

26. The battery pack according to claim 17, wherein: The connecting structure includes a second connecting structure arranged at both ends of the length direction of the first substrate, and the first substrate and the second substrate are attached to each other at both ends of the length direction, or the second substrate is retracted inwardly relative to the first substrate along the length direction to form at least one single-layer structure portion at the end of the first substrate that is not covered by the second substrate.

27. The battery pack according to any one of claims 1 to 26, characterized in that: A structural adhesive layer is provided on a side of the first substrate facing the second substrate, and the battery cell unit is connected to the structural adhesive layer.

28. The battery pack according to claim 27, wherein: The first substrate is provided with an adhesive groove, and at least a portion of the structural adhesive layer is embedded in the adhesive groove.

29. The battery pack according to any one of claims 2 to 26, characterized in that: The first substrate comprises: The first expansion limiting structure is provided on the substrate assembly, and the battery cell unit is limited between the first expansion limiting structures.

30. The battery pack according to claim 29, wherein: The first expansion limiting structure includes: an expansion beam abutting against the battery cell unit; and a supporting bracket, which is supported on a side of the expansion beam facing away from the battery cell unit.

31. The battery pack according to claim 30, characterized in that: The expansion beam comprises: The outer beam is designed to have a third cavity; and an inner beam disposed in the third cavity.

32. The battery pack according to claim 30, wherein: The supporting stand comprises: a first supporting portion, the first supporting portion abutting against the expansion beam; a second supporting portion, the second supporting portion abutting against the substrate assembly; and a third supporting portion connected between the first supporting portion and the second supporting portion, wherein the third supporting portion forms a fourth cavity.

33. The battery pack according to claim 30, characterized in that The first expansion limiting structure further includes: A stopper is provided on the second substrate, the stopper is located on a side of the expansion beam away from the battery cell unit, and the stopper is used to limit the expansion beam.

34. The battery pack according to any one of claims 1 to 26, characterized in that: The second substrate comprises: A cold plate, wherein the cold plate and the first base form the receiving cavity, and the cold plate is connected to the first base.

35. The battery pack according to claim 34, characterized in that: A first concave receiving area is formed on a side of the first base body facing the battery cell unit, and a second concave receiving area is formed on the cold plate at a position corresponding to the first concave receiving area.

36. The battery pack according to claim 35, characterized in that: The cold plate comprises: Vapor chamber; and a flow channel plate, wherein the flow channel plate and the temperature averaging plate are stacked, and both the temperature averaging plate and the flow channel plate are designed to be concave structures concave in a direction away from the first substrate.

37. The battery pack according to claim 36, characterized in that In the circumferential direction, the edge of the temperature uniform plate is provided with a first edge; in the circumferential direction, the edge of the flow channel plate is provided with a second edge. First connecting portions for connecting to the first base are provided at intervals on the first edge; second connecting portions for connecting to the first base are provided at intervals on the second edge.

38. The battery pack according to claim 36, characterized in that A first reinforcing rib is provided on the inner side of the temperature uniform plate, and a second reinforcing rib is provided on the inner side of the flow channel plate at a position corresponding to the first reinforcing rib.

39. The battery pack according to claim 36, wherein: The temperature uniform plate is designed to be a multi-layer structure, and two adjacent layers are made of different materials; the flow channel plate is designed to be a multi-layer structure, and two adjacent layers are made of different materials.

40. The battery pack according to claim 34, wherein: The cold plate is provided with a plug-in base, and the battery pack further includes: A distribution box is arranged on the cold plate and connected to the plug base.

41. The battery pack according to claim 34, characterized in that The cold plate is provided with a second expansion limiting structure, and the second expansion limiting structure abuts against the battery core unit.

42. The battery pack according to claim 34, wherein: The second substrate further comprises: A protection plate is connected to the cold plate and is located on a side of the cold plate away from the first base.

43. The battery pack according to claim 1, wherein: The first base body is formed with a cavity, and the cavity is provided with force-transmitting transverse beams and force-transmitting longitudinal beams arranged in a crisscross manner.

44. A vehicle, characterized in that A battery pack comprising the battery pack according to any one of claims 1 to 43.

45. The vehicle of claim 44, wherein: The vehicle includes a vehicle frame, and the first base is connected to the vehicle frame.

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