Battery lower casing, battery box, battery pack and vehicle

Abstract

This application discloses a battery lower housing, a battery box, a battery pack, and a vehicle. The battery lower housing includes a shell and a mounting body. The shell includes a bottom shell wall and side shell walls surrounding the bottom shell wall. The mounting body includes a plug-in mounting structure. The mounting body is located on the side of the side shell wall facing away from the interior of the shell, and the mounting body is fixedly connected to the side shell wall. This battery lower housing achieves reliable installation of the connectors through structural optimization.

Description

[0001] This application claims priority to Chinese Patent Application No. 202520175477.7, filed on January 26, 2025, entitled “A Battery Housing, Battery Pack and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of vehicle technology, and in particular to a battery lower housing, a battery box, a battery pack, and a vehicle. Background Technology

[0003] The powertrain of a new energy vehicle includes a battery pack, which comprises a battery housing, battery cell components, a thermal management system, an electrical system, and other accessories. The lower housing of the battery housing supports the battery cell components, thermal management system, and electrical system, and is a key structural component of the battery pack.

[0004] To meet the development needs of lightweighting, some battery lower housings are made by stamping and other methods. The walls of the housings are thin and cannot be directly used as the mounting base for related battery pack components. Utility Model Content

[0005] The purpose of this application is to provide a battery lower housing, a battery box, a battery pack, and a vehicle, wherein the battery lower housing can achieve reliable installation of connectors through structural optimization.

[0006] To address the aforementioned technical problems, embodiments of this application provide a lower battery housing, including a casing and a mounting body;

[0007] The shell includes a bottom shell wall and side shell walls surrounding the bottom shell wall;

[0008] The mounting body includes a plug-in mounting structure. The mounting body is located on the side of the side shell wall facing away from the interior of the housing, and the mounting body is fixedly connected to the side shell wall.

[0009] In one feasible embodiment, an annular seal is provided between the mounting body and the side shell wall.

[0010] In one feasible embodiment, the mounting body has an annular groove on its face facing the side shell wall, and at least a portion of the seal is embedded in the groove.

[0011] In one feasible embodiment, the width of the groove is not less than 6 to 10 mm, and / or the depth of the groove is not less than 3 to 7 mm.

[0012] In one feasible solution, the sealant is a sealant.

[0013] In one feasible embodiment, the mounting body is fixedly connected to the side shell wall by a plurality of fasteners, which are arranged at circumferential intervals along the seal.

[0014] In one feasible embodiment, the spacing between two adjacent fasteners along the circumferential direction of the seal is no greater than 80-120 mm.

[0015] In one feasible embodiment, the mounting body has a chamber with an opening facing the side shell wall, the plug-in mounting structure includes an insertion hole communicating with the chamber; the side shell wall has a through hole corresponding to the position of the insertion hole.

[0016] In one feasible embodiment, the plug-in mounting structure includes a first connecting hole and an insertion hole, wherein the first connecting hole is located on the outer periphery of the insertion hole.

[0017] In one feasible embodiment, the mounting body has a second connection hole that is fixedly connected to the side shell wall, and the mounting body is provided with a mounting post in the cavity. Both the first connection hole and the second connection hole are blind hole structures and are both located on the mounting post.

[0018] This application also provides a battery box, which includes the lower battery box body described in any of the above embodiments.

[0019] This application also provides a battery pack, which includes the battery box described above.

[0020] This application also provides a vehicle that includes the battery pack described above.

[0021] The battery lower housing provided in this application embodiment serves as a component of a battery box and can be used in battery packs, which can be used in vehicles. The battery lower housing includes a shell and a mounting body. The mounting body is fixedly connected to the side wall of the shell, and the mounting body is provided with a plug-in mounting structure for mounting connectors. When the shell wall is thin and cannot serve as a mounting base for contacts, the mounting body can be used to install connectors, facilitating the connection of internal battery cells and other structures to external devices. The mounting body improves the strength of the connector at the assembly interface with the shell, meeting the connector installation requirements. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the lower battery housing provided in one embodiment of this application;

[0023] Figure 2 This is an exploded view of the lower battery housing provided in one embodiment of this application;

[0024] Figure 3 for Figure 1 Structural diagram of the middle shell;

[0025] Figure 4 for Figure 1 Structural diagram of the connection between the second crossbeam, the first side shell wall, and the first side beam;

[0026] Figure 5 for Figure 1 A cross-sectional view of the lower housing of the middle battery at the connection point of the second crossbeam, the first side shell wall, and the first side beam;

[0027] Figure 6 for Figure 2 Structural diagram of the first side beam;

[0028] Figure 7 for Figure 4 Structural diagram of the transfer connector;

[0029] Figure 8 This is a structural diagram of the second crossbeam provided in one embodiment of this application;

[0030] Figure 9 for Figure 8 A partial view of the second crossbeam at its end is shown;

[0031] Figure 10 This is a partial structural diagram of the first side beam and the first side shell wall in one embodiment of this application;

[0032] Figure 11 This is a cross-sectional view of the connection between the first side shell wall and the first side beam in one embodiment of this application;

[0033] Figure 12 This is a cross-sectional view of the connection between the lower battery housing and the second side beam in one embodiment of this application.

[0034] Figure 13 This is a partial enlarged view of the lower battery housing at the location of the first mounting structure in one embodiment of this application;

[0035] Figure 14 This is a top view of the lower battery housing at the location of the first mounting structure in one embodiment of this application;

[0036] Figure 15 This is a schematic diagram of the connection structure between the first mounting structure and the third side shell wall in one embodiment of this application;

[0037] Figure 16 This is a cross-sectional view of the lower battery housing in one embodiment of the present application, at the location of the first mounting structure, the first longitudinal beam, and the first transverse beam.

[0038] Figure 17This is a partial structural diagram of a housing with a connector installed in one embodiment of this application;

[0039] Figure 18 This is an internal structural diagram of a housing on which a connector is installed, provided in one embodiment of this application.

[0040] Figure 19 This is an exploded view of the mounting structure of the connector and housing provided in one embodiment of this application;

[0041] Figure 20 This is an exploded view from another perspective of the mounting structure of the connector and housing provided in one embodiment of this application;

[0042] Figure 21 This is a structural diagram of the mounting body provided in one embodiment of this application;

[0043] Figure 22 This is a cross-sectional view of the mounting structure of the connector and the housing provided in one embodiment of this application;

[0044] Figure 23 This is a schematic diagram showing the positional relationship between the housing and the flow channel plate in one embodiment of this application;

[0045] Figure 24 This is an exploded view of the lower battery housing in another embodiment provided in this application.

[0046] Explanation of reference numerals in the attached figures:

[0047] Shell 10, receiving cavity 10A, bottom shell wall 11, side shell wall 12, first side shell wall 121, second side shell wall 122, third side shell wall 123, through hole 1231, flange 13;

[0048] Side beam structure 20, first side beam 21, side beam body 211, side beam inner side surface 2111, side beam top surface 2112, supporting wall part 212, second side beam 22, first beam part 221, second beam part 222, sealing layer 23, protruding wall part 24.

[0049] Crossbeam 30, first crossbeam 301, second crossbeam 302, third crossbeam 303, top wall of first crossbeam 31, top wall of second crossbeam 32, crossbeam mounting hole 33;

[0050] Adapter 40, adapter body 41, first extension wall 42, second extension wall 43, first adapter mounting hole 441, second adapter mounting hole 442;

[0051] First mounting structure 51, mounting part 511, mounting part 512, sealing ring 513, second mounting structure 52;

[0052] First longitudinal beam 61, first longitudinal beam segment 611, first top surface 6111, second longitudinal beam segment 612, second top surface 6121, third longitudinal beam segment 613, third top surface 6131, first arc-shaped surface 6141, second arc-shaped surface 6142, second longitudinal beam 62.

[0053] Mounting body 70, groove 71, seal 72, chamber 73, insertion hole 74, first connecting hole 75, second connecting hole 76, mounting post 77;

[0054] First fastener 81, second fastener 82, third fastener 83, fourth fastener 84, fifth fastener 85, sixth fastener 86, seventh fastener 87;

[0055] Flow channel plate 91, bottom guard plate 92, support pad 93;

[0056] Connector 100. Detailed Implementation

[0057] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0058] Without loss of generality, this embodiment uses the battery lower casing, whose outer contour is generally rectangular as shown in the illustration, as the main subject of description, to explain the specific implementation scheme in detail. It should be understood that the outer contour of the battery lower casing and the dimensional proportions shown in the illustration do not constitute a substantial limitation on the battery lower casing for which protection is claimed in this application.

[0059] The ordinal numbers "first," "second," etc., used in this article are for distinguishing different components with the same name and do not indicate a specific order or hierarchy. "Multiple" in this article refers to two or more items, while "several" refers to an indefinite quantity, which may be one, two, or three or more.

[0060] For ease of understanding and description, this paper defines three directions for the battery lower housing: the first direction x is the width direction of the battery lower housing, the second direction y is the length direction of the battery lower housing, and the third direction z is the thickness direction of the battery lower housing, which can also be understood as the height direction of the battery lower housing. In this paper, the left-right direction is the first direction x, the front-back direction is the second direction y, and the up-down direction (or top-bottom direction) is the third direction z. In the scenario where the battery lower housing is applied to a vehicle, "front" refers to the direction relatively closer to the front of the vehicle, "rear" refers to the direction relatively closer to the rear of the vehicle, the left-right direction is the width direction of the vehicle, and the up-down direction (top-bottom direction) is the height direction of the vehicle. The directional term "inner" in this paper refers to the direction relatively close to the center of the battery lower housing, and correspondingly, the directional term "outer" refers to the direction relatively far from the center of the battery lower housing. The use of these directional terms is only for clarity and convenience in describing the technical solution and does not constitute a limitation on the scope of protection.

[0061] Please refer to Figure 1 and Figure 2 , Figure 1 This is a structural diagram of the lower battery housing provided in one embodiment of this application. Figure 2 This is an exploded view of the lower battery housing provided in one embodiment of this application.

[0062] This embodiment provides a lower battery housing, which is a component of the battery box and can be used for a battery pack. The battery pack can be applied to a vehicle as one of the vehicle's power sources.

[0063] The lower battery housing includes a casing 10 and a side beam structure 20. The casing 10 includes a bottom casing wall 11 and side casing walls 12 surrounding the bottom casing wall 11. The side beam structure 20 is located on the side of the side casing wall 12 facing away from the interior of the casing 10, that is, the side beam structure 20 is located on the outside of the side casing wall 12, and the side beam structure 20 is fixedly connected to the side casing wall 12.

[0064] Using the above implementation scheme, the lower battery housing includes two modules: the shell 10 and the side beam structure 20. The two modules can be processed independently and then assembled. Processing the lower battery housing into modules and then assembling them reduces the processing difficulty of each module and makes it easier to control the process of processing a single module. That is, the deformation or dimensional accuracy of a single module is easy to control. In this way, the assembly complexity of the lower battery housing can be reduced and the structural performance of the lower battery housing can be improved.

[0065] The bottom shell wall 11 and the side shell wall 12 of the housing 10 enclose a receiving cavity 10A with an opening. The receiving cavity 10A of the housing 10 can be used to install the battery cells of the battery pack, and can also be used to install electrical components electrically connected to the battery cells and related accessories (such as wiring harnesses).

[0066] Please refer to this as well. Figure 3 , Figure 3 for Figure 1 Structural diagram of the middle shell.

[0067] The housing 10 has a box-shaped structure with an open top, and its shape can be customized according to application requirements. Taking the approximately rectangular housing 10 shown in the figure as an example, the side shell walls 12 may include two first side shell walls 121, a second side shell wall 122, and a third side shell wall 123. The two first side shell walls 121 are arranged opposite each other in the first direction x, and the second side shell walls 122 and the third side shell walls 123 are arranged opposite each other in the second direction y. The second side shell wall 122 is connected between one end of the two first side shell walls 121, and the third side shell wall 123 is connected between the other ends of the two first side shell walls 121.

[0068] The two first side shell walls 121 are the left and right side shell walls of the housing 10, respectively. The second side shell wall 122 can be the rear side shell wall of the housing 10, and the third side shell wall 123 can be the front side shell wall of the housing 10. That is, after the lower battery box is applied to the vehicle, the third side shell wall 123 is relatively closer to the front of the vehicle, and the second side shell wall 122 is relatively closer to the rear of the vehicle.

[0069] The following explanation will use the third side shell wall 123 as the front side shell wall and the second side shell wall 122 as the rear side shell wall as an example.

[0070] In some application examples, depending on the layout requirements, such as the need to avoid obstacles on vehicles, the third side shell wall 123 may have a bent section, such as... Figure 1 and Figure 3 As shown, the lower battery housing or casing 10 is roughly a cuboid structure with a missing corner.

[0071] In some embodiments, the housing 10 can be a single, integral structural component. This reduces the number of parts and connection points in the lower battery housing, simplifies the assembly process, and improves structural performance.

[0072] The shell 10 can be formed by hot stamping. Hot stamping utilizes the principle of thermoplastic forming of metals, which can simultaneously perform quenching heat treatment on the sheet metal, thereby improving forming accuracy and surface quality.

[0073] In one application example, the wall thickness of the housing 10 formed by hot stamping can be made as thin as less than 2mm, for example, 1.5mm, and the depth of the housing 10 can reach 105mm. While ensuring structural performance, the weight of the housing 10 can be reduced, providing technical conditions for the lightweight design of the battery lower casing.

[0074] The housing 10 can be made of metal materials such as aluminum or steel. The housing 10 can also be made of high-strength non-metallic materials such as composite materials. Using aluminum or composite materials for the housing 10 helps achieve a lightweight design for the battery's lower casing.

[0075] In other embodiments, the housing 10 may also be a spliced ​​structural component. For example, the bottom shell wall 11 and the side shell walls 12 of the housing 10 may be processed separately and then fixedly connected together, wherein the side shell wall 12 is a single integral component. Alternatively, the bottom shell wall 11, the first side shell wall 121, the second side shell wall 122, and the third side shell wall 123 of the housing 10 may all be independent components, processed separately, and then fixedly connected together. The aforementioned methods of fixed connection include, but are not limited to, welding, screwing, riveting, or bonding.

[0076] The aforementioned side beam structure 20 is located on the side of the side shell wall 12 facing away from the interior of the housing 10. This includes a configuration where the side beam structure 20 is provided on the outer periphery of part of the side shell wall 12 away from the housing 10, and a configuration where the side beam structure 20 is provided on the outer periphery of all side shell walls 12 away from the housing 10. The side beam structure 20 can improve the structural strength of the lower battery housing.

[0077] exist Figure 1 and Figure 2 In the illustrated embodiment, the side beam structure 20 includes multiple side beams, which are respectively disposed on the outer sides of multiple portions of the side shell wall 12, that is, side beams are disposed on the outer sides of the two first side shell walls 121, the second side shell wall 122, and the third side shell wall 123. The side shell wall 12 as a whole has a generally rectangular ring structure, and the side beam structure 20 as a whole also has a generally rectangular ring structure. In this way, the overall structural performance of the lower battery housing is stable and balanced.

[0078] In other embodiments, if performance requirements can be met, side beams may be provided only on the outer sides of the two first side shell walls 121, or only on the outer sides of the second side shell wall 122 and the third side shell wall 123, or side beams may be provided on the outer sides of the first side shell wall 121 and the second side shell wall 122.

[0079] In some implementations, the lower battery housing includes a crossbeam 30 located inside the housing 10. The crossbeam 30 serves two purposes: firstly, it divides the receiving cavity 10A into different areas to facilitate the installation of the battery cells and their related electrical components; secondly, it improves the structural strength of the lower battery housing, ensuring the safety of the battery pack application.

[0080] The crossbeam 30 extends along the first direction x, that is, the crossbeam 30 extends approximately along the vehicle width direction. The two ends of the crossbeam 30 are fixedly connected to the two first side shell walls 121 respectively.

[0081] In the illustrated embodiment, the lower battery housing is provided with three crossbeams 30, referred to as the first crossbeam 301, the second crossbeam 302, and the third crossbeam 303, respectively. (Combined with...) Figure 1 and Figure 3 It is understood that the first crossbeam 301 is located close to the third side shell wall 123, that is, the first crossbeam 301 is located close to the front side shell wall 123, and the second crossbeam 302 and the third crossbeam 303 are located relatively close to the second side shell wall 122 (i.e. the rear side shell wall 122), with the second crossbeam 302 located between the first crossbeam 301 and the third crossbeam 303.

[0082] The number and arrangement of the crossbeams 30 can be set as needed, and are not limited to those shown in the figure.

[0083] In some implementations, the lower battery housing may further include longitudinal beams, which can improve the structural strength of the lower battery housing. In the illustrated embodiment, a plurality of first longitudinal beams 61 and a plurality of second longitudinal beams 62 are connected between the first crossbeam 301 and the third side shell wall 123, and a plurality of second longitudinal beams 62 are connected between the third crossbeam 303 and the second side shell wall 122. The structures of the first longitudinal beams 61 and the second longitudinal beams 62 are different and can be set as needed in application.

[0084] In other embodiments, the longitudinal beams may be connected between two adjacent transverse beams 30.

[0085] In applications, the number and arrangement of longitudinal beams, as well as the structure of the longitudinal beams, can all be set according to the performance requirements of the battery lower housing.

[0086] In some embodiments, where side beam structures 20 are provided on the outer sides of both first side shell walls 121 of the housing 10, the crossbeam 30 can also be fixedly connected to the side beam structures 20. In other words, the crossbeam 30 is fixedly connected to both the first side shell walls 121 and the side beam structures 20. This can improve the structural strength of the connection points of the crossbeam 30, which is beneficial to improving the side impact protection capability of the lower battery housing.

[0087] The side beam structure 20 includes a first side beam 21, which is located on the side of the first side shell wall 121 facing away from the interior of the shell 10, and is fixedly connected to the first side shell wall 121.

[0088] In the application, a first side beam 21 can be provided on the outer side of each first side shell 121 away from the receiving cavity 10A. Both ends of the crossbeam 30 are fixedly connected to the corresponding first side shell 121 and the first side beam 21.

[0089] In one implementation, the lower battery housing includes an adapter 40, and the crossbeam 30 is fixedly connected to the first side beam 21 and the first side shell wall 121 via the adapter 40. It can be understood that the adapter 40 is located inside the housing 10.

[0090] In the illustrated embodiment, the end of each crossbeam 30 is fixedly connected to the first side beam 21 and the first side shell wall 121 via an adapter 40. The structure of the second crossbeam 302 and its fixed connection to the first side beam 21 and the first side shell wall 121 via the adapter 40 are described below as an example. The structure and connection method of the other crossbeams 30 can be understood by reference and will not be repeated.

[0091] Please refer to this as well. Figures 4 to 9 , Figure 4 for Figure 1 Structural diagram of the connection between the second crossbeam, the first side shell wall, and the first side beam. Figure 5 for Figure 1A cross-sectional view of the lower battery housing at the connection point of the second crossbeam, the first side shell wall, and the first side beam. Figure 6 for Figure 2 Structural diagram of the first side beam in the middle. Figure 7 for Figure 4 Structural diagram of the transfer connector Figure 8 This is a structural diagram of the second crossbeam provided in one embodiment of this application. Figure 9 for Figure 8 The diagram shows a partial view of the second crossbeam at its end.

[0092] In some implementations, the second crossbeam 302 is fixedly connected to the adapter 40 via a first fastener 81, and the first side beam 21 and the first side shell wall 122 are both fixedly connected to the adapter 40 via second fasteners 82. This achieves a fixed connection between the second crossbeam 302 and the first side beam 21 and the first side shell wall 122. Using fasteners helps control the amount of deformation during the assembly of the second crossbeam 302, the first side shell wall 122, and the first side beam 21, thereby improving the structural performance of the lower battery housing.

[0093] The first side beam 21 and the first side shell wall 122 are fixedly connected to the adapter 40 by the second fastener 82, which can simplify the assembly process and improve the fixing effect of the three.

[0094] In one implementation, the adapter 40 may include an adapter body 41 and two first extension wall portions 42. The two first extension wall portions 42 are arranged along a second direction y. The first extension wall portions 42 are fixedly disposed on the side of the adapter body 41 facing the second crossbeam 302. The second crossbeam 302 is inserted between the two first extension wall portions 42. The first extension wall portions 42 are fixedly connected to the second crossbeam 302. The adapter body 41 is fixedly connected to the first side shell wall 121 and the first side beam 21.

[0095] The second crossbeam 302 has two opposing crossbeam sidewalls in the second direction y. Two first extension wall portions 42 are fixedly connected to the two crossbeam sidewalls respectively. A first fastener 81 can pass through the first extension wall portion 42 and the crossbeam sidewall to fix them together. The first extension wall portion 42 is provided with a first adapter mounting hole 441, and the crossbeam sidewall of the second crossbeam 302 is provided with a crossbeam mounting hole 33. The first fastener 81 can pass through the first adapter mounting hole 441 and the crossbeam mounting hole 33 to fix the second crossbeam 302 and the first extension wall portion 42. In the illustrated example, the first extension wall portion 42 and the corresponding crossbeam sidewall are each provided with three mounting holes. In other implementation examples, the number and arrangement of the first fastener 81 and the mounting holes therewith can be set as needed.

[0096] The adapter body 41, the first side shell wall 121 and the first side beam 21 are provided with matching mounting holes. The second fastener 82 can pass through the adapter body 41 and the first side shell wall 121 in sequence and be inserted into the first side beam 21 to fix the three together.

[0097] The adapter body 41 may be provided with a second adapter mounting hole 442 for the second fastener 82 to pass through. Two first extended wall portions 42 may be provided in the middle region of the adapter body 41 in the second direction y, and the two end regions of the adapter body 41 in the second direction y may be provided with the second adapter mounting holes 442. In this way, the second crossbeam 302 is fixed to the middle region of the adapter 40, and the two end regions of the adapter 40 are fixed to the first side shell wall 121 and the first side beam 21, ensuring the fixation effect of the second crossbeam 302, the first side shell wall 121, and the first side beam 21. In the illustrated example, each end region of the adapter body 41 is provided with three second adapter mounting holes 442, and the first side shell wall 121 and the first side beam 21 are also provided with mounting holes (not shown in the figure) corresponding to each second adapter mounting hole 442. In other implementation examples, the number and arrangement of the second fastener 82 and its mating mounting holes can be set as needed.

[0098] In one implementation, the adapter body 41 may further include a second extension wall portion 43, which is fixedly disposed on the side of the adapter body 41 facing the second crossbeam 302, i.e., the second extension wall portion 43 and the first extension wall portion 42 are located on the same side of the adapter body 41. The second extension wall portion 43 is fixedly connected to the side of the second crossbeam 302 facing away from the bottom shell wall 11, i.e., the second extension wall portion 43 is fixedly connected to the top wall of the second crossbeam 302. In this way, the reliability of the fixed connection between the second crossbeam 302 and the adapter 40 can be improved, thereby improving the connection strength between the second crossbeam 302 and the first side shell wall 121 and the first side beam 21, which is beneficial to improving the side impact protection capability of the lower battery box.

[0099] In application, after the end of the second crossbeam 302 is inserted between the two first extension wall portions 42, the second extension wall portion 43 can overlap the top wall of the second crossbeam 302. The second extension wall portion 43 and the top wall of the second crossbeam 302 can also be fixedly connected by a first fastener 81 passing through both.

[0100] In one implementation, the second crossbeam 302 may have a stepped structure at its end. The top wall of the second crossbeam 302 may be recessed downwards at the end to form a stepped structure. Alternatively, it can be understood that the top of the second crossbeam 302 has a notch at the end to form a stepped structure. Figure 8 and Figure 9As shown, the second crossbeam 302 includes a first crossbeam top wall 31 and a second crossbeam top wall 32. The second crossbeam top wall 32 is positioned lower than the first crossbeam top wall 31, and is arranged away from the center of the second crossbeam 302 relative to the first crossbeam top wall 31, that is, the second crossbeam top wall 32 is closer to the first side shell wall 121 relative to the first crossbeam top wall 31. The first crossbeam top wall 31 and the second crossbeam top wall 32 form the aforementioned stepped structure. A crossbeam mounting hole 33 is provided on the second crossbeam top wall 32, and the second crossbeam top wall 32 is fixedly connected to the second extension wall 43 of the adapter 40 by a first fastener 81. After this arrangement, combined with Figure 4 and Figure 5 A recessed structure is formed between the second crossbeam 302 and the first side shell wall 121, which is recessed towards the bottom shell wall 11. This recessed structure can be used for wiring harness routing inside the lower battery housing.

[0101] In other implementations, it is also possible to set the top wall of the second crossbeam 302 at the same height.

[0102] In application, the adapter body 41 of the adapter 40 can fit against the first side shell wall 121, and the first extended wall portion 42 and the second extended wall portion 43 can fit against the corresponding wall surface of the second crossbeam 302 to ensure the fixing effect of the adapter 40 with the first side shell wall 121, the first side beam 21 and the second crossbeam 302.

[0103] In applications, the adapter 40 can be made of metal materials such as aluminum, aluminum alloy, and steel, or it can be made of non-metallic materials with higher strength.

[0104] In some embodiments, the first side beam 21 includes a side beam body 211. The aforementioned second fastener 82 can sequentially pass through the adapter body 41 and the first side shell wall 121, and be inserted into the side beam body 211 to securely connect the adapter 40, the first side shell wall 121, and the side beam body 211. The second fastener 82 may not pass through the side beam body 211 to ensure the appearance integrity of the lower battery housing. Assembling the second fastener 82 from the inside of the housing 10 outwards facilitates assembly. In other embodiments, the second fastener 82 can also be assembled from the outside of the housing 10 inwards, that is, the second fastener 82 can sequentially pass through the side beam body 211, the first side shell wall 121, and the adapter body 41 to securely connect the three.

[0105] In one implementation, the side beam body 211 can be a profile structure with at least one cavity. The side beam body 211, with its cavity-shaped profile structure, exhibits better structural stability and, when assembled with the housing 10, improves the structural performance of the lower battery casing.

[0106] Figure 5 and Figure 6In the illustrated embodiment, the side beam body 211 has four cavities, which are arranged approximately along the third direction z. In other implementation examples, the number and arrangement of cavities in the side beam body 211 can also be other forms. For example, the side beam body 211 can have two cavity groups arranged along the first direction x, and each cavity group includes at least two cavities arranged along the third direction z.

[0107] Please refer to this as well. Figure 10 and Figure 11 , Figure 10 This is a partial structural diagram of the first side beam and the first side shell wall in one embodiment provided in this application. Figure 11 This is a cross-sectional view of the connection between the first side shell wall and the first side beam in one embodiment of this application.

[0108] The side beam body 211 is fixedly connected to the first side shell wall 121 by a third fastener 83. It can be understood that in areas where the adapter 40 is not provided, the side beam body 211 and the first side shell wall 121 are fixedly connected by the third fastener 83. (This can be combined with...) Figure 4 and Figure 10 Understood. The third fastener 83 can be assembled from the inside of the housing 10 outwards. The third fastener 83 can pass through the first side shell wall 121 and be inserted into the side beam body 211 to fix the first side shell wall 121 and the side beam body 211.

[0109] In some implementations, a sealing layer 23 may also be provided between the side beam body 211 and the first side shell wall 121, such as... Figure 11 As shown. In this way, the sealing performance of the lower battery casing can be improved by setting the sealing layer 23.

[0110] The side beam body 211 has an inner side surface 2111 facing the first side shell wall 121, and the sealing layer 23 is disposed between the inner side surface 2111 of the side beam and the outer side surface of the first side shell wall 121.

[0111] The sealing layer 23 can be formed by using sealant, or it can be a molded sealing sheet or other structure. The sealing layer 23 can have a certain degree of flexibility or elasticity, so that the lower battery casing has a certain buffering or energy absorption capacity when subjected to side impacts, which can help improve the side impact protection capability of the lower battery casing.

[0112] In some embodiments, the side beam body 211 of the first side beam 21 is connected to a support wall portion 212 on the side facing the housing 10, and the support wall portion 212 supports the bottom housing wall 11. In this way, the support wall portion 212 of the first side beam 21 can provide support force for the housing 10, which is beneficial to improving the structural performance of the lower battery box.

[0113] The support wall portion 212 can be formed by extending from the bottom of the inner side surface 2111 of the side beam body 211 towards the direction of the shell 10. The extension dimension of the support wall portion 212 towards the direction of the shell 10 can be set as needed, with the principle of not interfering with the structure of the bottom of the bottom shell wall 11.

[0114] like Figure 6 As shown, the extension length of the supporting wall portion 212 can be approximately the same as the extension length of the side beam body 211, that is, the supporting wall portion 212 is a continuous wall structure. In other implementation examples, the supporting wall portion 212 may also include multiple supporting wall segments, which are arranged at intervals along the extension direction of the side beam body 211, that is, the supporting wall portion 212 is a discontinuous structure.

[0115] In some embodiments, a first side beam 21 may also be provided on the outer side of the second side shell wall 122 of the housing 10. The structure of the first side beam 21 and the connection method between the first side beam 21 and the second side shell wall 122 can be similar to the description of the foregoing embodiments and will not be repeated.

[0116] In the first side beams 21 provided on the outer side of the first side shell wall 121 and the second side shell wall 122, some of the first side beams 21 may not have a supporting wall portion 212.

[0117] In some embodiments, at least a portion of the side shell wall 12 of the housing 10 is connected to a flange 13 on the side away from the bottom shell wall 11, and the flange 13 extends in a direction away from the interior of the housing 10. The flange 13 may overlap the side beam structure 20, and the flange 13 is fixedly connected to the side beam structure 20.

[0118] exist Figure 3 In the example shown, the top ends of the two first side shell walls 121, the second side shell wall 122, and the third side shell wall 123, away from the bottom shell wall 11, are all connected with flanges 13.

[0119] The flange 13 is an integral structure with the side shell wall 12, and the top of the side shell wall 12 can be formed into the flange 13 by bending or other means. This helps to ensure the structural performance of the shell 10.

[0120] Taking the fit between the first side beam 21 and the first side shell wall 121 as an example, combined with... Figures 4 to 6 as well as Figure 10 , Figure 11 The first side beam 21 has a main body 211 with a top surface 2112 facing away from the bottom shell wall 11. A flange 13, connected to the first side shell wall 121, overlaps the top surface 2112 of the main body 211, meaning the top surface 2112 supports the flange 13. The flange 13 and the main body 211 can be fixedly connected by a fourth fastener 84. This configuration improves the reliability of the connection between the first side beam 21 and the first side shell wall 121.

[0121] In the design where the first side beam 21 has a supporting wall portion 212, and the flange 13 of the housing 10 is fixedly connected to the first side beam 21, in the third direction z, the bottom shell wall 11 of the housing 10 is supported by the supporting wall portion 212; in the first direction x or the second direction y, the first side shell wall 121 or the second side shell wall 122 of the housing 10 is fixedly connected to the side beam body 211; and in the third direction z, the flange 13 of the housing 10 is fixedly connected to the side beam body 211. The housing 10 is constrained by the first side beam 21 in all directions, which improves the structural performance of the lower battery housing.

[0122] In practical applications, the third side shell wall 123 (i.e. the front side shell wall) of the housing 10 is usually provided with a through hole that communicates with the outside world, so that the battery cells inside the housing 10 can be connected to relevant electrical or control equipment in the outside world through the wire harness.

[0123] In some embodiments, the side beam structure 20 includes a second side beam 22, which is located on the outside of the third side shell wall 123. The second side beam 22 includes a first beam portion 221, which is located on the side of the third side shell wall 123 away from the bottom shell wall 11 and is fixedly connected to the third side shell wall 123. In this way, the arrangement of the second side beam 22 can improve the structural strength of the location of the third side shell wall 123 and avoid obstructing the third side shell wall 123, which can facilitate the connection of the internal structure of the housing 10, such as the battery cell, to external equipment.

[0124] In some embodiments, the second side beam 22 may further include a second beam portion 222, which is located on the side of the third side shell wall 123 near the bottom shell wall 11. The second beam portion 222 is fixedly connected to a first mounting structure 51, which is fixedly connected to the third side shell wall 123. In this way, the second beam portion 222 is fixed to the third side shell wall 123 through the first mounting structure 51.

[0125] The first mounting structure 51 facilitates the installation of the lower battery box on the vehicle and also makes it easy to move the lower battery box during routine maintenance and repairs. Furthermore, the first mounting structure 51 helps improve the frontal collision protection capability of the lower battery box.

[0126] In the scheme where the second side beam 22 is provided with a first beam portion 221 and a second beam portion 222, the first beam portion 221 and the second beam portion 222 are arranged approximately in the third direction z, and the portion of the third side shell wall 123 located between the first beam portion 221 and the second beam portion 222 can be exposed.

[0127] Please refer to this as well. Figure 12 , Figure 12 This is a cross-sectional view of the connection between the third side shell and the second side beam of the lower battery housing in one embodiment of this application.

[0128] Figure 12 In the example shown, the first beam portion 221 is a beam structure with a roughly U-shaped cross-section. The U-shaped opening of the first beam portion 221 faces the side where the bottom shell wall 11 is located, and the first beam portion 221 is fixedly connected to the flange 13. For example, the first beam portion 221 and the flange 13 can be fixedly connected by fasteners. In this way, the first beam portion 221 is fixedly connected to the third side shell wall 123 through its fixed connection with the flange 13. In other implementations, the first beam portion 221 can also be directly fixed to the third side shell wall 123.

[0129] Figure 12 In the example shown, the second beam 222 is a profile structure with a cavity, and the first mounting structure 51 can be fixedly connected to the second beam 222 by fasteners or the like. The first mounting structure 51 and the third side shell 123 can also be fixedly connected by fasteners or the like.

[0130] The structure of the first beam 221 can also be in other forms, such as an L-shaped beam structure. The structure of the second beam 222 can also be in other forms, such as a beam structure with multiple cavities or a U-shaped beam structure.

[0131] In some implementation schemes, combined with Figure 1 and Figure 2 It is understood that a second mounting structure 52 is connected to the first side beam 21 on the outer side of the first side shell 121 to facilitate the hoisting or transfer of the lower battery casing. The second mounting structures 52 on the two opposite first side beams 21 along the first direction x can be arranged symmetrically to ensure the force balance of the lower battery casing during hoisting, thus avoiding safety hazards or damage to the lower battery casing.

[0132] The second mounting structure 52 can be integrated with the first side beam 21 to improve the structural strength of the lower battery housing. In other embodiments, the second mounting structure 52 can also be an independent structure, which is then assembled with the first side beam 21.

[0133] In some implementation schemes, each of the first side beams 21 of the side beam structure 20 can be an independent structure or connected together.

[0134] Please refer to this as well. Figures 13 to 16 , Figure 13 This is a partial enlarged view of the lower battery housing at the location of the first mounting structure in a specific embodiment; Figure 14 This is a top view of the lower battery housing at the location of the first mounting structure in a specific embodiment. Figure 15 This is a schematic diagram of the connection structure between the first mounting structure and the third side shell wall in a specific embodiment. Figure 16This is a cross-sectional view of the lower battery housing in a specific embodiment, showing the location of the first mounting structure, the first longitudinal beam, and the first transverse beam.

[0135] In some embodiments, the lower battery housing includes a housing 10, a first mounting structure 51, a first crossbeam 301 extending in a first direction x, and a first longitudinal beam 61 extending in a second direction y.

[0136] The structure of the housing 10 is as described in the aforementioned embodiment and will not be repeated here.

[0137] Both the first crossbeam 301 and the first longitudinal beam 61 are located within the receiving cavity 10A of the housing 10, meaning they are situated inside the housing 10. The first crossbeam 301 is positioned near the third side shell wall 123 (i.e., the front shell wall) of the housing 10, and its two ends are connected to the two first side shell walls 121, respectively. A first longitudinal beam 61 connects the third side shell wall 123 and the first crossbeam 301, meaning its two ends are fixedly connected to both the third side shell wall 123 and the first crossbeam 301, respectively.

[0138] The first mounting structure 51 is located on the side of the third side shell wall 123 facing away from the interior of the shell 10. The first mounting structure 51 is fixedly connected to the third side shell wall 123, and the connection position between the first mounting structure 51 and the third side shell wall 123 at least partially overlaps with the connection position between the first longitudinal beam 61 and the third side shell wall 123. That is, the area on the third side shell wall 123 used for connection with the first mounting structure 51 at least partially overlaps with the area on the third side shell wall 123 used for connection with the first longitudinal beam 61.

[0139] With this configuration, in the event of a frontal collision, the impact force can be transmitted to the first crossbeam 301 through the first mounting structure 51, the third side shell 123, and the first longitudinal beam 61, thereby transferring the entire vehicle's impact force to the inside of the battery pack to resist overall front deformation.

[0140] The height of the first longitudinal beam 61 near the third side shell wall 123 is greater than the height of the first longitudinal beam 61 near the first crossbeam 301. This height refers to the dimension of the first longitudinal beam 61 in the third direction z. In other words, the height of the front end of the first longitudinal beam 61 is greater than the height of the rear end of the first longitudinal beam 61.

[0141] With the above settings, when subjected to a frontal collision, the first mounting structure 51 is the first to receive the collision force. The collision force can be transmitted to the location of the first crossbeam 301 through the first longitudinal beam 61. Since the height of the rear end of the first longitudinal beam 61 is less than the height of the front end, the collision force can be transmitted to the position near the bottom of the first crossbeam 301 under the force transmission action of the first longitudinal beam 61, avoiding the upper area of ​​the first crossbeam 301 from being subjected to greater force and causing it to overturn. This can reduce the safety hazards caused by collision and squeezing into the battery cell.

[0142] In application, both the first longitudinal beam 61 and the first transverse beam 301 are in contact with the bottom shell wall 11. In other words, the bottom shell wall 11 supports the first longitudinal beam 61 and the first transverse beam 301 to ensure the structural stability of the lower battery box.

[0143] In some embodiments, the first longitudinal beam 61 includes a first longitudinal beam segment 611, which is adjacent to and fixedly connected to the first crossbeam 301. The first longitudinal beam segment 611 has a first top surface portion 6111 facing away from the bottom shell wall 11, and the first top surface portion 6111 is parallel to the bottom shell wall 11. The parallelism described herein includes mathematical parallelism as well as parallelism within a reasonable margin of error; for example, an inclination angle of 1° to 15° between the first top surface portion 6111 and the bottom shell wall 11 is also considered as parallelism. It can be understood that the first longitudinal beam segment 611 is a gently sloping segment with approximately equal height.

[0144] With this configuration, the frontal impact force is transmitted to the first longitudinal beam segment 611 via the first longitudinal beam 61. Under the buffering effect of the first longitudinal beam segment 611, it can be transmitted relatively smoothly to the position near the bottom of the first crossbeam 301, thus ensuring the energy absorption effect.

[0145] In one implementation, the first top surface 6111 of the first longitudinal beam segment 611 is not higher than the center position of the first transverse beam 301 in the third direction z. In this way, the impact force can be transferred to the position below the middle of the first transverse beam 301, reducing the probability of the battery cell being squeezed in by the impact and improving the safety of the lower battery casing under impact conditions.

[0146] In application, the height of the first top part 6111 of the first longitudinal beam segment 611 can be 1 / 4 to 1 / 2 of the height of the first crossbeam 301. In this way, a better force transmission path can be constructed between the first mounting structure 51 and the first crossbeam 301, which is beneficial to improving the frontal collision protection capability of the battery lower housing.

[0147] In some embodiments, the first longitudinal beam 61 includes a second longitudinal beam segment 612 connected to the first longitudinal beam segment 611. The second longitudinal beam segment 612 is located on the side of the first longitudinal beam segment 611 closest to the third side shell wall 123, and the height of the second longitudinal beam segment 612 gradually decreases from the third side shell wall 123 to the first crossbeam 301. Thus, the height change of the second longitudinal beam segment 612 is relatively smooth, allowing the impact force to be transmitted more smoothly to the area below the middle of the first crossbeam 301, achieving a better impact protection effect.

[0148] The second longitudinal beam segment 612 has a second top surface 6121 facing away from the bottom shell wall 11, and the second top surface 6121 and the first top surface 6111 are connected by a first arc-shaped surface 6141. In this way, the impact force can be smoothly transmitted at the junction of the second longitudinal beam segment 612 and the first longitudinal beam segment 611, which helps to improve the frontal impact protection capability of the battery lower housing.

[0149] In some embodiments, the first longitudinal beam 61 includes a third longitudinal beam segment 613, which is connected to the second longitudinal beam segment 612. The third longitudinal beam segment 613 is fixedly connected to the third side shell wall 123. The third longitudinal beam segment 613 has a third top surface portion 6131 facing away from the bottom shell wall 11, and the third top surface portion 6131 is parallel to the bottom shell wall 11. The parallelism here is explained above and will not be repeated.

[0150] With this configuration, the transmission of collision force between the first mounting structure 51 and the first longitudinal beam 61 can be relatively smooth, which is beneficial to improving the frontal collision protection capability of the battery lower housing.

[0151] The third top surface 6131 and the second top surface 6121 are connected by a second arc-shaped surface 6142. In this way, the impact force can be smoothly transmitted at the junction of the third longitudinal beam segment 613 and the second longitudinal beam segment 612, which helps to improve the frontal impact protection capability of the battery lower housing.

[0152] In the illustrated example, the first longitudinal beam 61 includes a third longitudinal beam segment 613, a second longitudinal beam segment 612, and a first longitudinal beam segment 611 connected sequentially from front to back. In other embodiments, the first longitudinal beam 61 may not include a third longitudinal beam segment 613.

[0153] exist Figure 16 In the image, a hollow arrow illustrates the path of force transmission during a head-on collision.

[0154] In some embodiments, the first mounting structure 51 includes a mounting portion 512 and a mounting portion 511. The mounting portion 512 is fixedly connected to the third side shell wall 123, and the mounting portion 511 extends forward away from the third side shell wall 123. Typically, the mounting portion 511 is positioned higher than the first longitudinal beam 61, or corresponds to the top region of the first longitudinal beam 61.

[0155] In some implementations, the mounting portion 512 of the first mounting structure 51 is fixedly connected to the third side shell wall 123 and / or the first longitudinal beam 61 by a plurality of fifth fasteners 85. Fixing the first mounting structure 51 to the third side shell wall 123 and / or the first longitudinal beam 61 using fasteners ensures reliable fixation and establishes a more efficient force transmission path.

[0156] In one implementation, a sealing ring 513 is provided on the outer periphery of the fifth fastener 85 to ensure the sealing of the lower battery casing.

[0157] The sealing ring 513 can be located between the mounting part 512 and the third side shell wall 123, or between the third side shell wall 123 and the first longitudinal beam 61. Alternatively, the sealing ring 513 can be provided between the mounting part 512 and the third side shell wall 123, and also between the third side shell wall 123 and the first longitudinal beam 61.

[0158] Multiple fifth fasteners 85 are distributed as evenly as possible within the connection area between the mounting part 512 and the third side shell wall 123 to ensure the reliability of the connection between the mounting part 512, the third side shell wall 123, and the first longitudinal beam 61.

[0159] Figure 15 In the example shown, there are five fifth fasteners 85, with one fifth fastener 85 located in the center and four fifth fasteners 85 arranged around the central fifth fastener 85. In other embodiments, the number and arrangement of the fifth fasteners 85 can be adjusted as needed.

[0160] For example, the spacing between the two fifth fasteners 85 can be controlled within 50mm.

[0161] For example, the fifth fastener 85 can be a bolt, and the bolt size is not less than M6.

[0162] Please refer to this as well. Figures 17 to 22 , Figure 17 This is a partial structural diagram of the housing with connectors installed in a specific embodiment; Figure 18 This is an internal structural diagram of the housing with connectors installed in a specific embodiment; Figure 19 This is an exploded view of the mounting structure of the connector and the housing in a specific embodiment; Figure 20 This is an exploded view of the mounting structure of the connector and housing in a specific embodiment from another perspective; Figure 21 This is a structural diagram of the mounting body in a specific embodiment; Figure 22 This is a cross-sectional view of the mounting structure of the connector and the housing in a specific embodiment of this application.

[0163] In some embodiments, the lower battery housing includes a housing 10 and a mounting body 70. The structure of the housing 10 is as described in the aforementioned embodiments and will not be repeated here.

[0164] Mounting body 70 includes a plug-in mounting structure. Mounting body 70 is located on the side of the side shell wall 12 of housing 10 facing away from the interior of housing 10, and mounting body 70 is fixedly connected to side shell wall 12. The plug-in mounting structure of mounting body 70 is used to install connector 100.

[0165] With the above settings, when the shell wall of the housing 10 is too thin to serve as the mounting base for the connector 100, the connector 100 can be installed using the mounting body 70. This facilitates the connection of the battery cells and other structures inside the lower battery housing to external devices via the connector 100. The mounting body 70 enhances the strength of the connector 100 at the assembly interface of the housing 10, thus meeting the installation requirements of the connector 100.

[0166] In applications, connector 100 is typically mounted on the front or rear shell wall of housing 10. Of course, connector 100 can also be mounted on the left or right shell wall of housing 10.

[0167] The following example illustrates the connection structure between the mounting body 70 and the third side shell wall 123 (i.e., the front side shell wall) of the housing 100. The connection methods between the mounting body 70 and the other side shell walls can be understood by referring to this example and will not be repeated here.

[0168] In some embodiments, an annular seal 72 is provided between the mounting body 70 and the third side shell wall 123. This ensures the sealing between the mounting body 70 and the third side shell wall 123, thereby guaranteeing the sealing effect of the lower battery casing.

[0169] In one implementation, the mounting body 70 has an annular groove 71 on its surface facing the third side shell wall 123, and at least a portion of the sealing member 72 is embedded in the groove 71. After the mounting body 70 is fixedly connected to the third side shell wall 123, the sealing member 72 can be pressed between the mounting body 70 and the third side shell wall 123 to achieve a seal at the connection.

[0170] In the illustrated example, the face of the mounting body 70 facing the third side shell wall 123 is roughly rectangular. Correspondingly, the annular groove 71 can be conformally arranged to the mounting body 70 and is also roughly rectangular. In other implementation examples, depending on the structure of the mounting body 70 and the sealing requirements, the groove 71 can be elliptical, polygonal, or other irregular annular shapes.

[0171] The seal 72 can be in the form of a sealant, which can be filled into the groove 71 during assembly. The sealant can be a two-component sealant, consisting of two independent components that can undergo a chemical reaction and cure after mixing. The two-component sealant can be a polysulfide-based two-component sealant or a polyurethane-based two-component sealant.

[0172] The seal 72 can also be a molded sealing ring.

[0173] To ensure a good seal, the width of the groove 71 can be no less than 6 to 10 mm. For example, the width of the groove 71 can be 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm.

[0174] To ensure a good seal, the depth of the groove 71 can be set to be no less than 3 to 7 mm. For example, the depth of the groove 71 can be 3 mm, 4 mm, 4.5 mm, 5 mm, 6 mm, or 7 mm.

[0175] In some embodiments, the mounting body 70 is fixedly connected to the third side shell wall 123 by a plurality of sixth fasteners 86, which are arranged at intervals along the circumference of the seal 72. In this way, a more balanced force can be applied to the seal 72 between the mounting body 70 and the third side shell wall 123, thereby improving the sealing effect of the seal 72.

[0176] In application, the spacing between two adjacent sixth fasteners 86 along the circumference of the seal 72 is set to no more than 80-120 mm. This ensures reliable connection between the mounting body 70 and the third side shell wall 123 while maintaining a good sealing effect. For example, the spacing between two adjacent sixth fasteners 86 can be 80 mm, 90 mm, 100 mm, 110 mm, or 120 mm.

[0177] When the sixth fastener 86 is in the form of a bolt, the bolt specification can be M5.

[0178] In other embodiments, the mounting body 70 may also be fixedly connected to the third side shell wall 123 by welding or bonding.

[0179] In some embodiments, the mounting body 70 has a chamber 73 with an opening facing the third side shell wall 123. The chamber 73 can be used to accommodate a portion of the connector 100 to ensure the installation reliability of the connector 100.

[0180] The mounting structure of the mounting body 70 includes an insertion hole 74 that communicates with the chamber 73. The third side shell wall 123 has a through hole 1231 corresponding to the position of the insertion hole 74. With this configuration, the connector 100 can be inserted into the insertion hole 74, with a portion of the connector 100 located within the chamber 73. The connector 100 can be connected to the battery cell or other electrical components inside the housing 10 through the chamber 73 and the through hole 1231.

[0181] In the illustrated example, the mounting body 70 has three insertion holes 74, which mate with three connectors 100 respectively. Correspondingly, the third side shell wall 123 has three through holes 1231, which mate with the three insertion holes 74 respectively.

[0182] The plug-in mounting structure of the mounting body 70 may further include a first connecting hole 75, which is located on the outer periphery of the insertion hole 74. After the connector 100 is inserted into the insertion hole 74, it can also be fixedly connected to the mounting body 70 by a seventh fastener 87. The seventh fastener 87 is engaged with the first connecting hole 75.

[0183] The mounting body 70 also has a second connection hole 76 that connects to the third side shell wall 123, and the aforementioned sixth fastener 86 can mate with the second connection hole 76. The sixth fastener 86 can pass through the inside of the third side shell wall 123 and mate with the second connection hole 76 of the mounting body 70.

[0184] In one implementation, the mounting body 70 has a mounting post 77 within its chamber 73. The aforementioned first connecting hole 75 and second connecting hole 76 are both blind holes and are located on the mounting post 77. This arrangement allows the mounting body 70 to have a more compact structure, meeting the installation requirements of the connector 100 while minimizing the space occupied by the mounting body 70.

[0185] Combination Figure 21 and Figure 22 It is understood that the mounting body 70 is provided with multiple mounting posts 77, which can be arranged at intervals along the circumference of the chamber 73. Each mounting post 77 has a first connecting hole 75 and a second connecting hole 76. The opening of the first connecting hole 75 faces away from the third side shell wall 123 to facilitate the insertion of the seventh fastener 87 through the connector 100 into the first connecting hole 75. The opening of the second connecting hole 76 faces the third side shell wall 123 to facilitate the insertion of the sixth fastener 86 through the third side shell wall 123 into the second connecting hole 76.

[0186] In some implementation schemes, the mounting body 70 can be made of die casting, which has good structural strength.

[0187] The fasteners mentioned in the foregoing embodiments (including the first fastener 81, the second fastener 82, the third fastener 83, the fourth fastener 84, the fifth fastener 85, the sixth fastener 86, and the seventh fastener 87, etc.) can all be bolts, combinations of bolts and nuts, rivets, screws, or other connecting parts. Depending on the type of fastener, the mounting hole or connection hole that matches the fastener can be a threaded hole, etc.

[0188] Please refer to this as well. Figure 23 and Figure 24 , Figure 23 This is a schematic diagram showing the positional relationship between the housing and the flow channel plate in one embodiment of this application. Figure 24 This is an exploded view of the lower battery housing in another embodiment provided in this application.

[0189] Based on the foregoing embodiments, the lower battery housing may further include a flow channel plate 91, which is fixedly connected to the housing 10. The flow channel plate 91 is located on the side of the bottom housing wall 11 facing away from the side housing wall 12, i.e., the flow channel plate 91 is located at the bottom of the bottom housing wall 11. After the flow channel plate 91 is fixed to the housing 10, a flow channel is formed between the flow channel plate 91 and the housing 10. The flow channel can supply cooling medium for thermal management of the battery pack.

[0190] The flow channel plate 91 can be fixedly connected to the housing 10 by welding, bonding or fastener connection.

[0191] In some embodiments, the lower battery housing may further include a bottom protective plate 92, which is located on the side of the flow channel plate 91 facing away from the housing 10, i.e., the bottom protective plate 92 is located at the bottom of the flow channel plate 91. The bottom protective plate 92 may be fixedly connected to at least one of the side beam structure 20 and the bottom shell wall 10. The bottom protective plate 92 may also be fixedly connected to the crossbeam 30 inside the housing 10.

[0192] The bottom guard plate 92 can play a protective role in preventing the flow channel plate 91 from cracking due to impact or the impact of external objects (such as stones).

[0193] The bottom protective plate 92 can be fixedly connected to the side beam structure 20 by welding, gluing, or using fasteners (such as bolts, screws, rivets, etc.). The fixed connection between the bottom protective plate 92 and the bottom shell wall 10 can be achieved using fasteners.

[0194] In some implementations, the lower battery housing may further include a support pad 93, which is disposed between the bottom protective plate 92 and the flow channel plate 91. The support pad 93 acts as a buffer when the bottom of the lower battery housing is impacted, preventing the flow channel plate 91 from being damaged by excessive impact force. The support pad 93 can be made of a material with sufficient strength and cushioning function, possessing a degree of flexibility or elasticity to provide cushioning while also having sufficient strength to provide good support for the flow channel plate 91.

[0195] The support pad 93 can be connected to the bottom guard plate 92 and / or the side beam structure 20 by means of adhesive bonding or other connection methods.

[0196] In some embodiments, the bottom of the side beam structure 20, away from the outer side of the housing 10, may be provided with a downwardly projecting protruding wall portion 24, such as... Figure 5 and Figure 12 As shown, the protruding wall portion 24 can thus limit the periphery of the bottom guard plate 92.

[0197] This application also provides a battery box, which includes the lower battery box described in any of the foregoing embodiments, and the battery box also includes an upper battery box connected to the lower battery box.

[0198] This application also provides a battery pack, which includes the battery box described in any of the foregoing embodiments and battery cells installed inside the battery box. This battery pack can be used in electric vehicles.

[0199] This application also provides a vehicle that includes the battery pack described in any of the foregoing embodiments. This vehicle can be an electric vehicle.

[0200] The aforementioned battery box, battery pack, and vehicle all possess the same technical effects as the aforementioned lower battery housing, and will not be repeated here. Other structural designs of the battery box or battery pack can refer to existing designs, but are not considered the core of this invention and will not be elaborated upon here.

[0201] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A battery lower case characterized by comprising: Includes housing and mounting body; The shell includes a bottom shell wall and side shell walls surrounding the bottom shell wall; The mounting body includes a plug-in mounting structure. The mounting body is located on the side of the side shell wall facing away from the interior of the housing, and the mounting body is fixedly connected to the side shell wall.

2. The battery lower housing according to claim 1, characterized in that, An annular seal is provided between the mounting body and the side shell wall.

3. The lower battery housing according to claim 2, characterized in that, The mounting body has an annular groove on the face of the side shell wall, and at least a portion of the seal is embedded in the groove.

4. The lower battery housing according to claim 3, characterized in that, The width of the groove is not less than 6~10mm, and / or the depth of the groove is not less than 3~7mm.

5. The battery lower casing according to any one of claims 2-4, characterized in that, The sealing element is a sealant.

6. The battery lower casing according to any one of claims 2-5, characterized in that, The mounting body is fixedly connected to the side shell wall by a plurality of fasteners, which are arranged at intervals along the circumference of the seal.

7. The lower battery housing according to claim 6, characterized in that, Along the circumference of the seal, the distance between two adjacent fasteners is no greater than 80~120mm.

8. The battery lower casing according to any one of claims 1-7, characterized in that, The mounting body has a chamber with an opening facing the side shell wall, and the plug-in mounting structure includes an insertion hole that communicates with the chamber; the side shell wall has a through hole corresponding to the position of the insertion hole.

9. The battery lower casing according to any one of claims 1-8, characterized in that, The plug-in installation structure includes a first connecting hole and an insertion hole, wherein the first connecting hole is located on the outer periphery of the insertion hole.

10. The lower battery housing according to claim 9, characterized in that, The mounting body has a second connection hole that is fixedly connected to the side shell wall. The mounting body has a mounting post in the cavity. Both the first connection hole and the second connection hole are blind holes and are located on the mounting post.

11. A battery box, characterized in that, The battery box includes the lower battery box body as described in any one of claims 1-10.

12. A battery pack, characterized in that, The battery pack includes the battery box as described in claim 11.

13. A vehicle, characterized in that, The vehicle includes the battery pack of claim 12.

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