Battery pack and electric vehicle

Abstract

The utility model discloses a battery pack and an electric vehicle, the battery pack comprises a first battery cell part, a second battery cell part and a locking part, and the first battery cell part is stacked above the second battery cell part; in at least one of the length direction and the width direction of the battery pack, the size of the first battery cell part is smaller than that of the second battery cell part, and a mounting space is formed in the position, smaller than the second battery cell part, of the first battery cell part; the locking part is arranged in the installation space. By adopting the scheme, the occupied area of the battery pack is reduced, so that the battery pack is more compact. The first battery cell part and the second battery cell part are configured to have different sizes, a mounting space of the locking part can be formed by using the size difference, and the locking part is close to the first battery cell part and is located in the area occupied by the second battery cell part, so that the arrangement of the locking part and the battery pack is more compact, the space occupied by the battery pack is reduced, and the battery pack is more convenient to use. Meanwhile, the locking part is close to the gravity center position of the battery pack, so that the stability of connection between the battery pack and the electric vehicle can be improved.

Description

Technical Field

[0001] The utility model relates to a battery pack and an electric vehicle. Background Art

[0002] The existing battery pack installation methods of electric vehicles are generally divided into fixed installation and replaceable installation. The fixed installation battery pack is generally fixed on the car; while the replaceable battery pack is generally installed in a movable manner. The battery pack can be removed at any time for replacement or charging, and then installed on the vehicle body after replacement or charging.

[0003] For replaceable battery packs, a locking portion is usually provided; a quick-change bracket is installed at the bottom of the electric vehicle, and a locking mechanism is provided on the quick-change bracket. The locking portion can cooperate with the locking mechanism to achieve the installation of the battery pack and the electric vehicle. A plurality of battery cells are usually arranged in the battery pack to improve the power supply capacity. The plurality of battery cells are usually laid flat in the horizontal direction to form a regular rectangular battery pack. At this time, the locking portion is usually arranged on the side of the battery pack, so that the battery pack is connected to the quick-change bracket of the electric vehicle on its side. However, this method requires occupying space on the side of the battery pack, resulting in a larger occupied space for the battery pack, and the locking portion is far away from the center of gravity of the battery pack, resulting in poor stability in the connection between the battery pack and the electric vehicle. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect that the battery pack occupies a large space in the prior art, and to provide a battery pack and an electric vehicle.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A battery pack is applied to an electric vehicle, the battery pack comprising a first battery core part, a second battery core part and a locking part, the locking part is used to cooperate with a locking mechanism of the electric vehicle;

[0007] The first battery cell part is stacked on top of the second battery cell part; in at least one direction of the length direction and the width direction of the battery pack, the size of the first battery cell part is smaller than the size of the second battery cell part, and the position where the first battery cell part is smaller than the second battery cell part forms an installation space; the locking part is arranged in the installation space.

[0008] In this solution, the first battery cell and the second battery cell are stacked up and down, which is beneficial to reducing the area occupied by the battery pack and making the battery pack more compact. The first battery cell and the second battery cell are configured to be different sizes, and the size difference can be used to form the installation space of the locking part. The locking part is close to the first battery cell and is located within the area occupied by the second battery cell, so that the arrangement of the locking part and the battery pack is more compact, which is beneficial to reducing the space occupied by the battery pack. At the same time, the locking part is close to the center of gravity of the battery pack, which can also improve the stability of the connection between the battery pack and the electric vehicle.

[0009] Preferably, in the length direction of the battery pack, the size of the first battery core is smaller than the size of the second battery core, and the installation space is provided on at least one side in the length direction of the battery pack;

[0010] And / or, in the width direction of the battery pack, the size of the first battery cell portion is smaller than the size of the second battery cell portion, and the installation space is provided on at least one side in the width direction of the battery pack.

[0011] In this solution, an installation space is formed at the edge of the battery pack in the length direction and / or width direction, which can facilitate the installation of the locking part and the assembly of the overall structure; it also facilitates the locking operation when locking with the electric vehicle.

[0012] Preferably, the installation spaces are provided on both sides of the battery pack in the length direction, and the installation spaces on both sides are arranged in parallel.

[0013] In this solution, there is installation space on both sides, and locking parts are installed in the installation space, which can be locked at both ends of the battery pack to improve the reliability of locking.

[0014] Preferably, the locking portion is mounted on an upper portion of the second battery core portion and extends along a width direction and / or a length direction of the battery pack.

[0015] In this solution, the locking part can be installed on the upper part of the second battery core, while reducing the space occupied on the battery pack. When the installation space is set at the edge in the length direction, the locking part extends along the width direction; when the installation space is set at the edge in the width direction, the locking part extends along the length direction.

[0016] Preferably, the locking portion is mounted on a side of the first battery core portion and extends along a width direction and / or a length direction of the battery pack.

[0017] In this solution, the locking part can be installed on the side of the first battery core, while reducing the space occupied on the battery pack. When the installation space is set at the edge in the length direction, the locking part extends along the width direction; when the installation space is set at the edge in the width direction, the locking part extends along the length direction.

[0018] Preferably, the locking portion comprises a lock base and a plurality of lock shafts, the lock base is connected to the second battery core portion, the lock base has an installation cavity extending along the width direction of the battery pack, and the opening of the installation cavity faces away from the second battery core portion;

[0019] Along the width direction of the battery pack, a plurality of locking shafts are installed in the installation cavity at intervals.

[0020] In this solution, the lock base can be used as a mounting component for the lock shaft, and also as a connecting component between the locking part and the second battery core part. When the lock base is connected to the second battery core part, multiple lock shafts can be installed. The lock base has an installation cavity for installing the lock shaft, and the installation cavity can protect the lock shaft; the opening of the installation cavity is away from the second battery core part, and when locked with the locking mechanism, the locking mechanism can extend into the installation cavity through the opening, and the installation cavity can also protect the locking mechanism.

[0021] Preferably, along the direction away from the second battery core portion, the opening of the installation cavity is outwardly expanding.

[0022] In this solution, by adopting the above structural form, when the locking shaft and the locking mechanism perform the locking operation, the outward-expanding opening can guide the locking process and improve the locking effect.

[0023] Preferably, the lock base includes a bottom plate and two side plates, the bottom plate is connected to the second battery core, the two side plates are spaced and connected to the bottom plate to form the installation cavity; the two ends of the lock shaft are respectively connected to the two side plates;

[0024] One end of the side plate is connected to the bottom plate, and the other end extends in a direction away from the bottom plate. The extended end of the side plate is inclined toward the outside of the installation cavity.

[0025] In this solution, the bottom plate in the lock base is connected to the second battery core, so that the installation operation can be achieved between the surfaces by fasteners. The side plates are connected to the bottom plate at intervals to form an installation cavity, and the lock shaft is connected to the bottom plate and is located in the installation cavity, so as to protect the lock shaft. In addition, the extended end of the bottom plate is inclined outward, thereby forming an outward expansion trend to form a guide structure.

[0026] Preferably, the lock base further comprises a reinforcing plate, and the reinforcing plate is penetrated through the two side plates.

[0027] In this solution, by adopting a reinforcing plate and installing it with the side plate, the structural strength of the lock base can be improved, thereby improving the reliability of locking.

[0028] Preferably, the battery pack further comprises an unlocking lever, and the unlocking lever is at least partially disposed through the second battery core portion and / or the installation cavity.

[0029] In this solution, the unlocking lever can act on the locking mechanism to perform an unlocking operation. The size of the second battery cell is larger than that of the first battery cell. Outside the second battery cell, the space formed by the size difference is the installation space; inside the second battery cell, the space formed by the size difference can be used as a storage space for the unlocking lever, so that the unlocking lever can directly unlock the locking mechanism. The part of the unlocking lever that passes through the second battery cell and / or the installation cavity can also be protected.

[0030] Preferably, the unlocking rod penetrates the bottom wall of the second battery core part, and extends vertically through the top wall of the second battery core part until it extends into the installation cavity.

[0031] In this solution, the unlocking rod is inserted into the second battery core and the installation cavity. The second battery core and the installation cavity can be used as the installation area of ​​the unlocking rod. The second battery core and the installation cavity can also be used to protect the unlocking rod to prevent external obstacles from affecting the movement of the unlocking rod.

[0032] Preferably, the first battery cell portion includes a first battery cell, and the second battery cell portion includes a second battery cell;

[0033] The battery pack further includes a bottom frame, a middle frame and a connecting bracket, wherein the bottom frame and the middle frame are arranged at intervals and connected by the connecting bracket;

[0034] The second battery cell is installed between the bottom frame and the middle frame, and the first battery cell is installed above the middle frame.

[0035] In this solution, by adopting the above structural arrangement, corresponding installation areas can be respectively configured for the first battery cell and the second battery cell, so that the first battery cell and the second battery cell can be reliably installed.

[0036] Preferably, the battery pack further comprises side frames, and the side frames are provided at both ends of the bottom frame and the middle frame along the length direction of the battery pack; a mounting plate is provided above the side frame, and the mounting plate is used to mount the locking portion.

[0037] In this solution, the side frame is located at the edge of the battery pack, and the side frame can be used as an extension of the bottom frame and the middle frame to form a region with a size difference between the first battery cell and the second battery cell. A mounting plate is provided above the side frame to mount the locking portion. The inside of the side frame can also be used as a storage area for components such as an unlocking lever and battery cell cables.

[0038] Preferably, the battery pack further comprises a cover plate, and the cover plate is provided at least at one of the bottom of the bottom frame, between the bottom frame and the middle frame, between the side frame and the mounting plate, and above the middle frame.

[0039] In this solution, the cover plate can be used to seal each frame and plate, forming an overall internal space for the installation and arrangement of various devices; it also forms the appearance structure of the battery pack and simplifies the number of parts of the battery pack.

[0040] An electric vehicle comprises the battery pack as described above.

[0041] In this solution, the first battery cell and the second battery cell are stacked up and down, which is beneficial to reducing the area occupied by the battery pack and making the battery pack more compact. The first battery cell and the second battery cell are configured to be different sizes, and the size difference can be used to form the installation space of the locking part. The locking part is close to the first battery cell and is located within the area occupied by the second battery cell, so that the arrangement of the locking part and the battery pack is more compact, which is beneficial to reducing the space occupied by the battery pack and also can improve the connection performance between the battery pack and the electric vehicle.

[0042] The positive progress of the utility model is that the first battery cell and the second battery cell are stacked up and down, which is conducive to reducing the area occupied by the battery pack and making the battery pack more compact. The first battery cell and the second battery cell are configured to be different sizes, and the size difference can be used to form the installation space of the locking part. The locking part is close to the first battery cell and is located within the area occupied by the second battery cell, so that the arrangement of the locking part and the battery pack is more compact, which is conducive to reducing the space occupied by the battery pack and can also improve the connection performance between the battery pack and the electric vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic diagram of the structure of a battery pack provided by an embodiment of the utility model when installed in an electric vehicle;

[0044] Figure 2 A schematic diagram of the structure of a battery pack provided by an embodiment of the utility model at one viewing angle;

[0045] Figure 3 A schematic diagram of the structure of a battery pack provided by an embodiment of the utility model from another viewing angle;

[0046] Figure 4 A schematic diagram of the structure inside the battery pack provided by an embodiment of the utility model;

[0047] Figure 5 A schematic diagram of the structure of a locking portion provided in an embodiment of the utility model;

[0048] Figure 6 A cross-sectional schematic diagram of a locking portion provided in an embodiment of the utility model;

[0049] Figure 7 A schematic diagram of a locking portion and a locking mechanism when locked provided by an embodiment of the utility model;

[0050] Figure 8 A schematic diagram of another locking portion and locking mechanism provided in an embodiment of the utility model;

[0051] Fig. 9 for Figure 8 A schematic diagram of the middle locking portion and the locking mechanism when locked;

[0052] Fig.10 A structural schematic diagram of another locking mechanism provided by an embodiment of the utility model;

[0053] Fig.11 A schematic structural diagram of another locking portion provided by an embodiment of the utility model;

[0054] Fig.12 for Fig.10 The locking mechanism and Fig.11 A schematic diagram of the locking portion in the embodiment of the present invention when the locking portion is locked;

[0055] Fig.13 A cross-sectional view of a battery pack provided in an embodiment of the utility model, showing an internal unlocking lever;

[0056] Fig.14 A schematic diagram of an internal frame of a battery pack provided by an embodiment of the utility model from one perspective, wherein a cover plate is provided on the bottom frame;

[0057] Fig.15 A schematic diagram showing another perspective of the internal frame of the battery pack provided in an embodiment of the present invention.

[0058] Description of Reference Numerals

[0059] Battery pack 10, first battery cell 100, first battery cell 110, second battery cell 200, second battery cell 210, locking portion 300, lock base 310, installation cavity 311, bottom plate 312, plug-in slot 3121, side plate 313, plug-in protrusion 3131, reinforcing rib 314, reinforcing plate 315, lock shaft 320, limiting support portion 400, unlocking rod 500, installation space 600, bottom frame 710, bottom longitudinal beam 711, bottom cross beam 712, short longitudinal beam 713, middle frame 720, middle longitudinal beam 72 1, middle cross beam 722, column 723, connecting bracket 730, side frame 740, mounting plate 750, support arm 760, cover plate 770, inspection port 780, protruding chamber 790, vehicle beam 20, locking mechanism 30, locking assembly 31, locking tongue 32, quick-change bracket 40, locking seat 801, first opening 802, hanging portion 803, first threaded portion 804, hanging rod 903, second threaded portion 904, second opening 905, locking member 906, mounting shell 907, length direction L, width direction W. DETAILED DESCRIPTION

[0060] The present invention is further described below by way of embodiments, but the present invention is not limited to the scope of the embodiments.

[0061] The present invention provides a battery pack 10 for use in electric vehicles. Figure 1 , Figure 2 and Figure 3 As shown, the battery pack 10 includes a first battery cell portion 100, a second battery cell portion 200 and a locking portion 300, wherein the locking portion 300 is used to cooperate with the locking mechanism 30 of the electric vehicle; the first battery cell portion 100 is stacked on top of the second battery cell portion 200; in at least one direction of the length direction L and the width direction W of the battery pack 10, the size of the first battery cell portion 100 is smaller than the size of the second battery cell portion 200, and an installation space 600 is formed at a position where the first battery cell portion 100 is smaller than the second battery cell portion 200; the locking portion 300 is arranged in the installation space 600.

[0062] By configuring multiple battery cells, the power supply capacity of the battery pack 10 can be improved. Stacking the first battery cell 110 and the second battery cell 210 up and down can help reduce the area occupied by the battery pack 10, making the battery pack 10 more compact. The first battery cell 100 and the second battery cell 200 are configured to be different sizes, and the size difference can be used to form an installation space 600 for the locking portion 300. The locking portion 300 is close to the first battery cell 100 and is located within the area occupied by the second battery cell 200, so that the arrangement of the locking portion 300 and the battery pack 10 is more compact, which is conducive to reducing the space occupied by the battery pack 10, and can also improve the connection performance between the battery pack 10 and the electric vehicle.

[0063] like Figure 1 As shown, the first battery cell 100 is stacked on top of the second battery cell 200. Compared with the arrangement of the first battery cell 100 and the second battery cell 200 in the horizontal direction, the stacking method can occupy less area. When the battery pack 10 is locked in the electric vehicle, the first battery cell 100 can also be located on one side of the beam 20 of the electric vehicle, so that the space on one side of the beam 20 can be used to accommodate the first battery cell 100, so that sufficient battery replacement space can be reserved between the second battery cell 200 and the ground.

[0064] In a specific implementation, the first battery cell portion 100 and the second battery cell portion 200 may be provided with battery cells respectively, and the size difference between the first battery cell portion 100 and the second battery cell portion 200 may be achieved by configuring battery cells of different specifications. Specifically, the specification of the first battery cell 110 in the first battery cell portion 100 is smaller than the specification of the second battery cell 210 in the second battery cell portion 200, and the size of the first battery cell portion 100 is adapted to the first battery cell 110, and the size of the second battery cell portion 200 is adapted to the second battery cell 210. Therefore, in appearance, the size of the first battery cell portion 100 is smaller than the size of the second battery cell portion 200.

[0065] In other embodiments, the size difference between the first battery cell portion 100 and the second battery cell portion 200 can also be achieved by configuring different frame structures. Specifically, the specifications of the first battery cell 110 in the first battery cell portion 100 can be the same as or different from the specifications of the second battery cell 210 in the second battery cell portion 200. The frame structure forming the first battery cell portion 100 is smaller than the frame structure forming the second battery cell portion 200, so that in appearance, the size of the first battery cell portion 100 is smaller than the size of the second battery cell portion 200.

[0066] Furthermore, the size difference of the first battery cell part 100 can be in at least one direction of the length direction L and the width direction W of the battery pack 10, so as to form at least one installation space 600, and the corresponding components can be installed in the installation space 600. For example, the locking part 300 can be arranged in the installation space 600. In other installation spaces 600, a limiting support part 400 can also be installed. The limiting support part 400 is a component that is docked with the corresponding component on the electric vehicle to limit the length direction L or the width direction W of the vehicle, and to provide support in the height direction.

[0067] Specifically, in the length direction L of the battery pack 10, the size of the first battery cell 100 is smaller than the size of the second battery cell 200, and an installation space 600 is provided on at least one side in the length direction L of the battery pack 10; and / or, in the width direction W of the battery pack 10, the size of the first battery cell 100 is smaller than the size of the second battery cell 200, and an installation space 600 is provided on at least one side in the width direction W of the battery pack 10. Forming the installation space 600 at the edge in the length direction L and / or the width direction W of the battery pack 10 can facilitate the installation of the locking part 300 and the assembly of the overall structure. It can be understood that, compared with forming the installation space 600 in the middle of the battery pack 10, forming the installation space 600 at the edge can provide more ample operating space for the installation of components such as the locking part 300 and the limiting support part 400, and during assembly, after the first battery cell 100 and the second battery cell 200 are assembled, the lock shaft 320, the limiting support part 400 and other components can be installed, which is conducive to optimizing the assembly process. In addition, when the electric vehicle is locked, the locking operation of the locking portion 300 is also facilitated, and the docking of the position limiting support portion 400 is also facilitated.

[0068] Furthermore, the installation space 600 in the length direction L of the battery pack 10 and the installation space 600 in the width direction W of the battery pack 10 may have similar space sizes or different space sizes. Figure 2 As shown, as an embodiment, the installation space 600 in the length direction L of the battery pack 10 is relatively large, and can be used for the installation of the locking portion 300 which requires more space, and the installation space 600 in the width direction W of the battery pack 10 is relatively small, and can be used for the installation of the limiting support portion 400 which requires less space. In other embodiments, if the size permits, the locking portion 300 can also be arranged in the width direction W of the battery pack 10, that is, this embodiment provides a feasible embodiment, and those skilled in the art can make adaptive adjustments according to the actual use requirements under the concept of forming the installation space 600 by using the size difference between the first battery cell 100 and the second battery cell 200 provided in the utility model, and the protection scope of the utility model should not be limited to the embodiments provided in the embodiment.

[0069] Further in combination with the implementation method provided in this embodiment, Figure 2 and Figure 3 As shown, both sides of the battery pack 10 in the length direction L are provided with installation spaces 600, and the installation spaces 600 on both sides are arranged in parallel. Both sides have installation spaces 600, and locking parts 300 are installed in the installation spaces 600, which can be locked at both ends of the battery pack 10 to improve the reliability of locking.

[0070] In a specific implementation, the battery cell may be in the form of a rectangular parallelepiped structure, and its length direction L may form more size differences, thereby forming a larger installation space 600. Figure 1 , Figure 2 and Figure 3 As shown, the length direction L of the battery cell can be along the length direction L of the electric vehicle, and both ends of the length direction L of the first battery cell part 100 are smaller than the second battery cell part 200, so that the first battery cell part 100 and the second battery cell part 200 form a stepped installation space 600 at both ends of the length direction L, and the installation space 600 at both ends can be used to install the locking part 300.

[0071] Furthermore, if Figure 1 and Figure 2 As shown, the width direction W of the battery cell also has a size difference, and forms an installation space 600, wherein the installation space 600 near the beam 20 can be used to install the limiting support part 400. Figure 2 and Fig.14 As shown, the bottom of the limiting support part 400 is installed on the upper surface of the second battery core part 200 and extends toward the direction close to the vehicle beam 20 so as to be inserted into the limiting groove (not shown in the figure) installed on the vehicle beam 20.

[0072] In a specific implementation, the installation of the components in the installation space 600 (such as the locking portion 300 and the position limiting support portion 400 in this embodiment) can utilize the second battery core portion 200 or the first battery core portion 100. The component can be connected to the second battery core portion 200 or the first battery core portion 100 by fasteners, specifically, by fasteners such as screws and bolts, or by welding and the like.

[0073] As a preferred embodiment, the locking portion 300 is installed on the upper part of the second battery cell 200 and extends along the width direction W and / or the length direction L of the battery pack 10. The locking portion 300 can be installed on the upper part of the second battery cell 200, while reducing the space occupied on the battery pack 10. When the installation space 600 is set at the edge of the length direction L, the locking portion 300 extends along the width direction W; when the installation space 600 is set at the edge of the width direction W, the locking portion 300 extends along the length direction L.

[0074] Specifically, Figure 2 , Figure 3 and Figure 4 As shown, an installation space 600 for installing the locking portion 300 is provided at the edge in the length direction L. The locking portion 300 is installed on the upper surface of the second battery cell portion 200 and extends along the width direction W of the battery pack 10.

[0075] As another preferred embodiment, the locking portion 300 is installed on the side of the first battery cell 100 and extends along the width direction W and / or the length direction L of the battery pack 10. The locking portion 300 can be installed on the side of the first battery cell 100, while reducing the space occupied on the battery pack 10. When the installation space 600 is set at the edge of the length direction L, the locking portion 300 extends along the width direction W; when the installation space 600 is set at the edge of the width direction W, the locking portion 300 extends along the length direction L. Further, the locking portion 300 can be installed on the side wall of the first battery cell 100 located in the installation space 600.

[0076] In specific implementation, the locking portion 300 can adopt a variety of structural forms. In the following content, some feasible implementations will be provided, but the structural form of the locking portion 300 should not be limited to the following implementations. In addition, this embodiment provides an implementation in which the locking portion 300 is arranged along the width direction W of the battery pack 10, but as mentioned above, the locking portion 300 can also be arranged along the length direction L of the battery pack 10. And, this embodiment provides an implementation in which the locking portion 300 is installed on the second battery core part 200, but as mentioned above, the locking portion 300 can also be installed on the first battery core part 100. Therefore, the arrangement direction and installation position of the locking portion 300 should not be limited to the following implementations.

[0077] As a feasible implementation of the locking portion 300, Figure 2 , Figure 3 and Figure 5 As shown, the locking part 300 includes a lock base 310 and a plurality of lock shafts 320. The lock base 310 is connected to the second battery core part 200. The lock base 310 has an installation cavity 311 extending along the width direction W of the battery pack 10. The opening of the installation cavity 311 faces away from the second battery core part 200. Along the width direction W of the battery pack 10, a plurality of lock shafts 320 are installed in the installation cavity 311 at intervals. The lock base 310 can be used as a mounting component for the lock shaft 320, and at the same time as a connecting component between the locking part 300 and the second battery core part 200. When the lock base 310 is connected to the second battery core part 200, the installation of a plurality of lock shafts 320 can be realized. Among them, the lock base 310 has an installation cavity 311 for installing the lock shaft 320, and the installation cavity 311 can protect the lock shaft 320; the opening of the installation cavity 311 is away from the second battery core part 200, and when locked with the locking mechanism 30, the locking mechanism 30 can extend into the installation cavity 311 through the opening, and the installation cavity 311 can also protect the locking mechanism 30.

[0078] like Figure 1 and Figure 5 As shown, the lock shaft 320 is a cylindrical structure, and the lock shaft 320 is arranged in a horizontal plane. Figure 7 The locking mechanism 30 is used in conjunction with the locking mechanism 30 shown. The locking mechanism 30 is installed on a quick-change bracket 40 connected to the electric vehicle and is located outside the vehicle beam 20 of the electric vehicle. The locking mechanism 30 includes a plurality of locking components 31. In the width direction W of the electric vehicle, the plurality of locking components 31 are arranged at intervals and correspond one to one with the locking shaft 320. In addition, as shown in FIG. Figure 2 As shown, the electrical connector of the battery pack 10 is arranged on its long side. When the battery pack 10 is connected to the electric vehicle, it can enter the predetermined position from the side of the electric vehicle, and then the battery pack 10 moves along the vertical direction to the opening of the locking assembly 31, and then moves along the horizontal direction to the locking groove in the locking assembly 31, and then the locking tongue 32 of the locking assembly 31 moves downward to achieve locking. In this process, in addition to achieving locking, the horizontal movement of the battery pack 10 can also achieve the movement of the electrical connector toward the beam 20 to achieve electrical connection of the electrical connector. Therefore, the mounting cavity 311 in this embodiment extends along the width direction W of the battery pack 10, the lock shaft 320 is arranged along the width direction W of the battery pack 10, and the electrical connector is arranged at the long side of the battery pack 10 close to the beam 20, so that the side space of the electric vehicle can be used for battery replacement operations.

[0079] like Figure 5 and Figure 6 As shown, the opening of the installation cavity 311 is outwardly expanded in the direction away from the second battery core 200. When the locking shaft 320 and the locking mechanism 30 are locked, the outwardly expanded opening can guide the locking process and improve the locking effect.

[0080] like Figure 5 and Figure 6 As shown, the lock base 310 includes a bottom plate 312 and two side plates 313. The bottom plate 312 is connected to the second battery core 200. The two side plates 313 are connected to the bottom plate 312 at intervals to form a mounting cavity 311. The two ends of the lock shaft 320 are connected to the two side plates 313 respectively. One end of the side plate 313 is connected to the bottom plate 312, and the other end extends in a direction away from the bottom plate 312. The extended end of the side plate 313 is inclined toward the outside of the mounting cavity 311. The bottom plate 312 in the lock base 310 is connected to the second battery core 200, so that the installation operation can be achieved between the surfaces by fasteners. The side plates 313 are connected to the bottom plate 312 at intervals to form a mounting cavity 311. The lock shaft 320 is connected to the bottom plate 312 and is located in the mounting cavity 311, so as to protect the lock shaft 320. In addition, the extended end of the bottom plate 312 is inclined toward the outside, thereby forming an outward expansion trend to form a guide structure.

[0081] Specifically, Figure 5 and Figure 6As shown, the bottom plate 312 is a flat plate structure, and the upper surface of the second battery core 200 located in the installation space 600 is also a plane. The two can be connected by fasteners or welding, preferably by bolt connection. Figure 6 As shown, the side plate 313 and the bottom plate 312 can be connected by plugging. Specifically, the bottom of the side plate 313 can be provided with a plurality of plug-in protrusions 3131 at intervals, and the bottom plate 312 can have a corresponding plug-in groove 3121, and the plug-in protrusion 3131 is inserted into the plug-in groove 3121. After the side plate 313 extends a certain distance in the vertical direction, it tilts toward the outside of the installation cavity 311, and the lock shaft 320 is installed on the vertical extension part of the side plate 313. A reinforcing rib 314 can also be provided between the side plate 313 and the bottom plate 312, and a plurality of reinforcing ribs 314 are arranged at intervals and are arranged near the position where the lock shaft 320 is located. The two ends of the lock shaft 320 are respectively connected to the two side plates 313, so as to support the two ends of the lock shaft 320 and improve the reliability of the lock shaft 320.

[0082] Furthermore, if Figure 5 As shown, the lock base 310 also includes a reinforcing plate 315, which is inserted through the two side plates 313. By adopting the reinforcing plate 315 and installing it with the side plates 313, the structural strength of the lock base 310 can be improved, thereby improving the reliability of locking. Specifically, the two side plates 313 are correspondingly provided with through grooves, and the reinforcing plate 315 is inserted into the through grooves of the two side plates 313.

[0083] As another feasible implementation of the locking portion 300, the locking portion 300 includes at least one of a threaded connector and a T-shaped hanging member, wherein the threaded connector is used to thread the battery pack 10 to the quick-change bracket 40, and the T-shaped hanging member is used to rotate and engage the battery pack 10 to the quick-change bracket 40. The locking portion 300 can be operated in the vertical direction to lock the battery pack 10. Components such as an electrical connector and a liquid cooler on the battery pack 10 can be installed on the upper surface of the battery pack 10 to achieve docking.

[0084] Specifically, in the threaded connection method, such as Figure 8 and Fig. 9As shown, the locking mechanism 30 includes a locking seat 801, the locking seat 801 has a first opening 802 extending in the vertical direction, a first threaded portion 804 is provided in the first opening 802, and the first threaded portion 804 is an internal thread. The locking portion 300 includes a mounting shell 907 and a locking member 906, a second opening 905 extending in the vertical direction in the mounting shell 907, the locking member 906 is vertically arranged in the second opening 905, the locking member 906 can move in the vertical direction relative to the mounting shell 907, and the locking member 906 is provided with a second threaded portion 904 that matches the first threaded portion 804, and the second threaded portion 904 can mesh with the first threaded portion 804, thereby realizing the locking and unlocking of the locking mechanism 30 and the locking portion 300.

[0085] In other specific embodiments, in the rotational engagement mode, such as Fig.10 , Fig.11 and Fig.12 As shown, the locking mechanism 30 includes a locking seat 801, the locking seat 801 has a first opening 802 extending in the vertical direction, a hanging portion 803 is provided in the locking seat 801, the locking seat 801 has a hanging cavity, the first opening 802 is connected to the hanging cavity, and the hanging seat 803 is located at the bottom of the hanging cavity. In this embodiment, the first opening 802 is a square hole, and the hanging portion 803 is located on both sides of the first opening 802. The locking portion 300 includes a locking member 906, and the upper end of the locking member 906 is provided with a hanging rod 903 extending in the horizontal direction. The hanging rod 903 is a columnar body and is horizontally arranged on the top of the locking member 906. The hanging rod 903 and the locking member 906 together constitute a T-shaped structure.

[0086] When the hooking rod 903 is in the first position, the hooking rod 903 can pass through the first opening 802 and enter the hooking cavity of the locking seat 801. When the hooking rod 903 located in the hooking cavity rotates to the second position, the hooking rod 903 can be hooked on the limiting portion 803, so that the locking mechanism 30 and the locking portion 300 are relatively locked and fixed.

[0087] In a specific implementation, the battery pack 10 may be installed with other components, such as the locking portion 300, the limiting support portion 400, the battery cell, etc., in addition to the above-mentioned components, such as a connector for electrical connection, a connector for liquid cooling, and an unlocking lever 500 described below. The unlocking lever 500 can unlock the locking mechanism 30, specifically, the lock tongue 32.

[0088] like Fig.13As shown, the battery pack 10 also includes an unlocking rod 500, which is at least partially disposed in the second battery cell portion 200 and / or the installation cavity 311. The unlocking rod 500 can act on the locking mechanism 30 to perform an unlocking operation. The size of the second battery cell portion 200 is larger than that of the first battery cell portion 100. Outside the second battery cell portion 200, the space formed by the size difference is the installation space 600; inside the second battery cell portion 200, the space formed by the size difference can be used as a storage space for the unlocking rod 500, so that the unlocking rod 500 can perform an unlocking operation directly on the locking mechanism 30. The portion of the unlocking rod 500 that penetrates the second battery cell portion 200 and / or the installation cavity 311 can also be protected.

[0089] like Fig.13 , Fig.14 and Fig.15 As shown, unlocking levers 500 are provided at the locking parts 300 at both ends; at either end, two unlocking levers 500 are provided at intervals. Specifically, the locking part 300 has three locking shafts 320, and an unlocking lever 500 is provided between two adjacent locking shafts 320.

[0090] like Fig.13 As shown, the unlocking lever 500 passes through the bottom wall of the second battery cell 200, and extends vertically through the top wall of the second battery cell 200 until it reaches the mounting cavity 311. The unlocking lever 500 passes through the second battery cell 200 and the mounting cavity 311, and the second battery cell 200 and the mounting cavity 311 can be used as the mounting area of ​​the unlocking lever 500. The second battery cell 200 and the mounting cavity 311 can also be used to protect the unlocking lever 500 to prevent external obstacles from affecting the movement of the unlocking lever 500. Further, as Fig.13 As shown, the unlocking rod 500 passes through the bottom plate 312 of the locking portion 300 to extend into the installation cavity 311 .

[0091] In specific implementation, the main structure of the battery pack 10 can be formed in a variety of ways, such as by splicing a plate structure of appropriate strength, or by assembling a frame structure plus a cover plate 770 (skin). In the following content, some feasible implementation methods will be provided, but the main structure of the battery pack 10 should not be limited to the following implementation methods.

[0092] like Fig.14 and Fig.15As shown, the first battery cell part 100 includes a first battery cell 110, and the second battery cell part 200 includes a second battery cell 210; the battery pack 10 also includes a bottom frame 710, a middle frame 720 and a connecting bracket 730, the bottom frame 710 and the middle frame 720 are arranged at intervals and connected by the connecting bracket 730; the second battery cell 210 is installed between the bottom frame 710 and the middle frame 720, and the first battery cell 110 is installed above the middle frame 720. The first battery cell 110 and the second battery cell 210 can be respectively configured with corresponding installation areas, so that the first battery cell 110 and the second battery cell 210 can be reliably installed.

[0093] like Figure 4 As shown, an embodiment is provided in which the first battery cell 110 and the second battery cell 210 are of different specifications, wherein the first battery cell 110 and the second battery cell 210 have different sizes in the length direction L and the width direction W, and the difference in the length direction L is large, thereby forming a larger installation space 600 in the length direction L of the battery pack 10. The wiring harness of the first battery cell 110 and the wiring harness of the second battery cell 210 are located at the same end, and the battery pack 10 has a layout space reserved at the end with the wiring harness.

[0094] like Fig.14 and Fig.15 As shown, the battery pack 10 further includes a side frame 740. Along the length direction L of the battery pack 10, the side frames 740 are provided at both ends of the bottom frame 710 and the middle frame 720; a mounting plate 750 is provided above the side frame 740, and the mounting plate 750 is used to install the locking portion 300. The side frame 740 is located at the edge of the battery pack 10. The side frame 740 can serve as an extension of the bottom frame 710 and the middle frame 720 to form an area of ​​the size difference between the first battery cell 100 and the second battery cell 200. The mounting plate 750 is provided above the side frame 740, and can be used for installing the locking portion 300. The inside of the side frame 740 can also serve as a storage area for components such as the unlocking lever 500 and the battery cell cable.

[0095] like Fig.14 and Fig.15 As shown, the bottom frame 710 and the middle frame 720 form the main load-bearing frame of the battery pack 10. The bottom frame 710 and the middle frame 720 can be formed by a combination of cross beams and longitudinal beams, wherein Fig.14 As shown, the middle frame 720 has two middle longitudinal beams 721 arranged at intervals, and a plurality of middle cross beams 722 are arranged between the two middle longitudinal beams 721. The first battery cell 110 can be installed on the middle cross beam 722, and the position limiting support part 400 can be installed on the middle longitudinal beam 721. Fig.15As shown, the bottom frame 710 has two bottom longitudinal beams 711 arranged at intervals, and a plurality of bottom cross beams 712 are arranged between the two bottom longitudinal beams 711 . The second battery cell 210 can be installed on the bottom cross beam 712 .

[0096] like Fig.14 and Fig.15 As shown, a plurality of connecting brackets 730 are arranged at intervals between the bottom longitudinal beam 711 and the middle longitudinal beam 721. The bottom of the connecting bracket 730 is connected to the bottom longitudinal beam 711, and the top is connected to the middle longitudinal beam 721. The side frames 740 are arranged at the four corners of the battery pack 10. The bottom of the side frames 740 is connected to the bottom longitudinal beam 711, and the side is connected to the end of the middle longitudinal beam 721. The mounting plate 750 is connected to the top of the side frames 740. The bottom plate 312 of the locking part 300 is connected to the mounting plate 750. At the end of the battery pack 10 in the length direction L, a short longitudinal beam 713 is also arranged between two adjacent bottom cross beams 712, and the unlocking rod 500 can be passed through the short longitudinal beam 713.

[0097] like Fig.14 and Fig.15 As shown, at one side close to the vehicle beam 20, the side walls of the bottom longitudinal beam 711 and the middle longitudinal beam 721 are further provided with a support arm 760, and a cover plate 770 is provided on the support arm 760 to form a protruding chamber 790 on the side. The protruding chamber 790 can be used for wiring, and for arranging electrical connectors, liquid cooling connectors, etc.

[0098] like Figure 2 and Figure 3 As shown, the battery pack 10 further includes a cover plate 770, and the cover plate 770 is provided at least at the bottom of the bottom frame 710, between the bottom frame 710 and the middle frame 720, between the side frame 740 and the mounting plate 750, and above the middle frame 720. The cover plate 770 can be used to seal each frame and the plates, forming an overall internal space for the installation and arrangement of each device; it also forms the appearance structure of the battery pack 10, and simplifies the number of parts of the battery pack 10. In addition, the main structure of the battery pack 10 is formed by the cover plate 770 and the frame, which can also reduce the weight of the battery pack 10.

[0099] like Figure 2 and Figure 3As shown, cover plates 770 are provided around the bottom frame 710 and the middle frame 720. The bottom frame 710, the side frame 740, the middle frame 720 and the corresponding cover plates 770 form a lower accommodating chamber of the battery pack 10, and the lower accommodating chamber can be used to install and protect the second battery cell 210, the unlocking rod 500, the battery cell wiring harness, etc. A cover plate 770 is provided above the middle frame 720. The middle frame 720 and the cover plate 770 form an upper accommodating chamber of the battery pack 10, and the upper accommodating chamber can be used to install and protect the first battery cell 110 and the wiring harness, etc. Among them, a column 723 is also provided on the side of the upper surface of the middle frame 720 close to the vehicle beam 20. As shown Figure 3 As shown, a maintenance port 780 is provided on the cover plate 770 on the side away from the vehicle beam 20 in the lower accommodating cavity and the upper accommodating cavity, so that when there is a fault or maintenance is required due to other reasons, it is convenient to cut off the power in time, which is beneficial to ensure safety.

[0100] The utility model embodiment also provides an electric vehicle, which includes the battery pack 10 as described above. By configuring a plurality of battery cells, the power supply capacity of the battery pack 10 can be improved. Stacking the first battery cell 110 and the second battery cell 210 up and down can help reduce the area occupied by the battery pack 10, making the battery pack 10 more compact. The first battery cell 100 and the second battery cell 200 are configured to be of different sizes, and the size difference can be used to form an installation space 600 for the locking portion 300. The locking portion 300 is close to the first battery cell 100 and is located within the area occupied by the second battery cell 200, so that the arrangement of the locking portion 300 and the battery pack 10 is more compact, which is conducive to reducing the space occupied by the battery pack 10, and can also improve the connection performance between the battery pack 10 and the electric vehicle.

[0101] like Figure 1 As shown, the electric vehicle has two beams 20 extending along the length direction L of the vehicle body and arranged at intervals, and the above-mentioned battery packs 10 can be provided on the outside of the two beams 20. A quick-change bracket 40 can be straddled above the beam 20, and the battery packs 10 on both sides can be connected to the corresponding locking mechanisms 30 on the quick-change bracket 40 respectively. A vehicle-end connector is also provided on the inner side of the two beams 20, and the battery pack 10 can be connected to the vehicle-end connector to achieve electrical connection and liquid cooling connection with the electric vehicle.

[0102] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A battery pack, applied to an electric vehicle, characterized in that: The battery pack includes a first battery core part, a second battery core part and a locking part, and the locking part is used to cooperate with the locking mechanism of the electric vehicle; The first battery cell part is stacked on top of the second battery cell part; in at least one direction of the length direction and the width direction of the battery pack, the size of the first battery cell part is smaller than the size of the second battery cell part, and the position where the first battery cell part is smaller than the second battery cell part forms an installation space; the locking part is arranged in the installation space.

2. The battery pack according to claim 1, characterized in that: In the length direction of the battery pack, the size of the first battery core is smaller than the size of the second battery core, and the installation space is provided on at least one side in the length direction of the battery pack; And / or, in the width direction of the battery pack, the size of the first battery cell portion is smaller than the size of the second battery cell portion, and the installation space is provided on at least one side in the width direction of the battery pack.

3. The battery pack according to claim 2, characterized in that: The installation spaces are provided on both sides of the battery pack in the length direction, and the installation spaces on both sides are arranged in parallel.

4. The battery pack according to claim 2, characterized in that: The locking portion is mounted on the upper portion of the second battery core portion and extends along the width direction and / or length direction of the battery pack; And / or, the locking portion is mounted on a side of the first battery core portion and extends along a width direction and / or a length direction of the battery pack.

5. The battery pack according to claim 4, characterized in that: The locking portion includes a lock base and a plurality of lock shafts, the lock base is connected to the second battery core portion, the lock base has an installation cavity extending along the width direction of the battery pack, and the opening of the installation cavity faces away from the second battery core portion; Along the width direction of the battery pack, a plurality of locking shafts are installed in the installation cavity at intervals.

6. The battery pack according to claim 5, characterized in that: Along the direction away from the second battery core portion, the opening of the installation cavity is outwardly expanding.

7. The battery pack according to claim 6, characterized in that: The lock base includes a bottom plate and two side plates, the bottom plate is connected to the second battery core, the two side plates are spaced and connected to the bottom plate to form the installation cavity; the two ends of the lock shaft are respectively connected to the two side plates; One end of the side plate is connected to the bottom plate, and the other end extends in a direction away from the bottom plate. The extended end of the side plate is inclined toward the outside of the installation cavity.

8. The battery pack according to claim 7, characterized in that: The lock base also includes a reinforcement plate, and the reinforcement plate is penetrated through the two side plates.

9. The battery pack according to claim 5, characterized in that: The battery pack further includes an unlocking lever, which is at least partially disposed through the second battery core portion and / or the installation cavity.

10. The battery pack according to claim 9, characterized in that: The unlocking rod passes through the bottom wall of the second battery core part and extends through the top wall of the second battery core part along the vertical direction until it extends into the installation cavity.

11. The battery pack according to any one of claims 1 to 10, characterized in that: The first battery cell portion includes a first battery cell, and the second battery cell portion includes a second battery cell; The battery pack further includes a bottom frame, a middle frame and a connecting bracket, wherein the bottom frame and the middle frame are arranged at intervals and connected by the connecting bracket; The second battery cell is installed between the bottom frame and the middle frame, and the first battery cell is installed above the middle frame.

12. The battery pack according to claim 11, characterized in that: The battery pack also includes a side frame, and along the length direction of the battery pack, the side frames are provided at both ends of the bottom frame and the middle frame; a mounting plate is provided above the side frame, and the mounting plate is used to install the locking portion.

13. The battery pack according to claim 12, characterized in that: The battery pack further includes a cover plate, which is provided at least at a bottom of the bottom frame, between the bottom frame and the middle frame, between the side frame and the mounting plate, and above the middle frame.

14. An electric vehicle, characterized in that: The electric vehicle comprises the battery pack as claimed in any one of claims 1-13.

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