Battery pack and vehicle

Abstract

The utility model discloses a battery pack and a vehicle, the battery pack comprises a box body and a battery cell group, the box body comprises a bottom plate; the frame is mounted on the bottom plate, the frame comprises a plurality of edge beams distributed along the periphery of the bottom plate, and the bottom plate and the plurality of edge beams define a cavity for mounting the battery cell group; wherein a plurality of first cavities distributed in the height direction are formed in the edge beam, an opening is formed in the upper portion of the inner side wall of the edge beam, and the opening extends in the extending direction of the edge beam. According to the battery pack provided by the invention, the opening is formed in the inner side wall of the edge beam, so that the material consumption of the edge beam is reduced under the condition of ensuring the overall structural strength, the weight of the frame is further reduced, the lightweight design of the box body is realized, the energy density of the battery is improved, and the endurance is further improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and in particular relates to a battery pack and a vehicle. Background Technology

[0002] A battery pack typically consists of a casing, battery cells, a power distribution module, and some structural components. To ensure the structural strength of the battery pack, the casing is usually quite heavy, which reduces the energy density of the battery and thus affects the driving range. Utility Model Content

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery pack and vehicle that achieves a lightweight design of the housing, increases battery energy density, and thus improves driving range.

[0004] In a first aspect, this application provides a battery pack, including a housing and a battery cell assembly, the housing comprising:

[0005] Base plate;

[0006] A frame, mounted on a base plate, includes multiple side beams distributed along the periphery of the base plate, the base plate and the multiple side beams defining a cavity for mounting the battery cell assembly;

[0007] The side beam has multiple first cavities distributed along the height direction, and the upper part of the inner side wall of the side beam has an opening that extends along the extension direction of the side beam.

[0008] According to the battery pack of this application, by setting an opening on the inner side wall of the side beam, the material used for the side beam is reduced while ensuring the overall structural strength, thereby reducing the weight of the frame, realizing a lightweight design of the box, increasing the battery energy density, and thus improving the range.

[0009] According to one embodiment of this application, the opening is provided with a flange extending along the height direction of the side beam.

[0010] According to one embodiment of this application, at least two oppositely arranged side beams include a vertical section and a mounting section. The vertical section has a first cavity with an opening on the inner sidewall of the vertical section. The mounting section is connected to the outer sidewall of the vertical section. The mounting section has a second cavity, and the opening and the second cavity have an overlapping portion in the thickness direction of the vertical section.

[0011] According to one embodiment of this application, a plurality of expansion beams are provided in the cavity, and the plurality of expansion beams are arranged at intervals on the base plate along the cell stacking direction of the cell assembly to divide the cavity into a plurality of chambers distributed along the cell stacking direction.

[0012] Among them, a battery cell assembly is installed between two adjacent expansion beams, and the end of the battery cell assembly in the battery cell stacking direction abuts against the two expansion beams.

[0013] According to one embodiment of this application, a clamping member is provided on the top of the battery cell assembly, and the end of the clamping member is fixedly connected to two adjacent expansion beams.

[0014] According to one embodiment of this application, the thickness of the expansion beam tends to increase from top to bottom.

[0015] According to one embodiment of this application, the battery pack further includes a cover body, which covers the top of a plurality of side beams. The cover body is provided with a first reinforcing rib extending along the stacking direction of the battery cells at the position corresponding to the battery cell group, and a plurality of second reinforcing ribs are provided on the periphery of the cover body evenly distributed along its circumference.

[0016] According to one embodiment of this application, a cushioning element is provided on the top of the cover;

[0017] The buffer element is positioned at the intersection with the first reinforcing rib.

[0018] According to one embodiment of this application, the bottom plate is provided with an exhaust chamber, the top of the bottom plate is provided with an exhaust hole communicating with the exhaust chamber, and the bottom of the battery cell assembly is provided with an explosion-proof valve corresponding to the exhaust hole.

[0019] Secondly, this application provides a vehicle that includes a battery pack as described in any of the first aspects, the battery pack being used to supply power to the vehicle.

[0020] According to the vehicle of this application, by setting an opening on the inner side wall of the side beam, the material used in the side beam is reduced while ensuring the overall structural strength, thereby reducing the weight of the frame, realizing a lightweight design of the box body, increasing the battery energy density, and thus improving the range.

[0021] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is an exploded structural diagram of the battery pack provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of the box provided in the embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the side beam provided in an embodiment of this application;

[0026] Figure 4 This is another structural schematic diagram of the edge beam provided in the embodiment of this application;

[0027] Figure 5 This is a partial structural schematic diagram of the battery pack provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the assembly structure of the expansion beam and clamping component provided in the embodiments of this application;

[0029] Figure 7 This is a partially enlarged structural schematic diagram of the expansion beam and clamping member provided in the embodiments of this application.

[0030] Figure label:

[0031] 1000, battery pack;

[0032] 100. Housing; 110. Base plate; 111. Vent; 120. Frame; 121. Side beam; 1211. Facade; 1211a. First cavity; 1211b. Opening; 1211c. Flanged edge; 1212. Mounting part; 1212a. Second cavity; 130. Expansion beam; 140. Clamping element;

[0033] 200. Cover; 210. First reinforcing rib; 220. Second reinforcing rib; 230. Buffer component;

[0034] 200. Battery cell pack. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0036] The following is for reference. Figures 1-7 This application describes a battery pack and a vehicle according to embodiments thereof.

[0037] Please see Figure 1 The battery pack 1000 provided in this application embodiment includes a housing 100 and a cell assembly 200.

[0038] The battery cell assembly 200 includes multiple individual battery cells, and the battery cell assembly 200 is installed inside the housing 100.

[0039] Please see Figure 1 , Figure 2 and Figure 3The housing 100 includes a base plate 110 and a frame 120. The frame 120 is mounted on the base plate 110 and includes a plurality of side beams 121 distributed along the periphery of the base plate 110. The base plate 110 and the plurality of side beams 121 define a cavity for mounting the battery cell assembly 200. Each side beam 121 has a plurality of first cavities 1211a distributed along its height direction, and the upper part of the inner sidewall of the side beam 121 has an opening 1211b extending along the extension direction of the side beam 121.

[0040] The base plate 110 is used to support the weight of the entire battery pack 1000 and the pressure from the cell assembly 200.

[0041] The side beam 121 of the frame 120 is made of extruded aluminum alloy profile. During the extrusion process, with the help of a specially designed die, multiple first cavities 1211a distributed along the height direction can be formed inside the side beam 121. The presence of these first cavities 1211a is similar to an I-beam structure, which can significantly improve the structural strength of the side beam 121 without significantly increasing its weight. Taking a common battery pack side beam as an example, the number of first cavities 1211a can be determined according to the specific size and design requirements of the side beam 121, and there is no specific limit to the number; it can be three, four, five, or more. Furthermore, the height dimensions of each first cavity 1211a can be the same or different, and there is also no specific limitation.

[0042] The cavity defined by the multiple side beams 121 and the base plate 110 has a size and shape designed according to the external shape of the battery cell assembly 200. For example, there are four side beams 121, which together form a rectangular frame 120. The rectangular frame 120 is fixed to the base plate 110 to define a cavity for mounting the battery cell assembly 200, which is installed in the cavity.

[0043] An opening 1211b is provided on the upper part of the inner wall of the side beam 121, making the upper part of the side beam 121 a thin-walled structure. The side beam 121 in the battery pack 1000 mainly bears the weight from the cell assembly 200, as well as various vibrations and impact loads generated during vehicle operation. The opening 1211b in the upper part of the side beam 121 is provided because the shear force and bending moment in this area are relatively small. When the battery pack 1000 is subjected to external forces, the lower part of the side beam 121 and the area with multiple first cavities 1211a can bear the main structural stress. Compared to providing openings 1211b at other locations on the side beam 121, the upper opening 1211b has the lowest weakening effect on the overall structural strength of the side beam 121. At the same time, the thin-walled structure formed by the opening 1211b reduces material usage and achieves weight reduction, while, due to the stress characteristics of the upper part, it does not substantially affect the side beam 121's ability to perform key functions such as supporting and protecting the cell assembly 200.

[0044] In one example, after the side beam 121 is extruded, the opening 1211b can be made using a high-precision milling process. Alternatively, in another example, when the opening 1211b is the same length as the side beam 121, the opening 1211b can be formed directly during the extrusion process by designing the mold.

[0045] According to the battery pack 1000 provided in the embodiments of this application, by providing an opening 1211b on the inner side wall of the side beam 121, the material used in the side beam 121 is reduced while ensuring the overall structural strength, thereby reducing the weight of the frame 120, realizing the lightweight design of the box 100, improving the battery energy density, and thus improving the range.

[0046] Please see Figure 3 and Figure 4 According to some embodiments of this application, an flange 1211c extending along the height direction of the side beam 121 may be provided at the opening 1211b.

[0047] A flange 1211c of a specific shape is provided at the opening 1211b on the upper part of the inner side wall of the side beam 121. Specifically, the flange 1211c can be elongated, extending vertically downward from the upper edge of the opening 1211b, and maintaining a certain distance from the lower edge of the opening 1211b.

[0048] The flange 1211c added to the edge of the opening 1211b acts as a reinforcing rib. When the battery pack 1000 encounters bumps and vibrations during vehicle operation, or experiences impacts due to rapid acceleration or braking, the side beam 121 will bear complex stresses. Since the flange 1211c extends downward from the upper edge of the opening 1211b, it can first absorb the stress concentrated in the upper part of the opening 1211b under stress, and then distribute the stress to other areas of the side beam 121 through its own structure. Finite element analysis simulation and actual testing show that under the same external force, the stress concentration at the opening 1211b of the side beam 121 with this flange 1211c is lower than that without the flange 1211c, which greatly avoids deformation or even cracking at the opening 1211b due to excessive stress concentration, significantly improving the overall structural stability of the side beam 121 and ensuring the stable operation of the battery pack 1000.

[0049] Furthermore, the opening 1211b can also be used for wiring within the battery pack 1000. Since the flange 1211c extends downwards from the upper edge of the opening 1211b along the height direction of the side beam 121, it provides ample and stable attachment points for wiring fixation. After completing the initial wiring arrangement of the cell assembly 200, workers can use cable ties, wire clips, and other fasteners to tightly bind the wiring to the flange 1211c. This improves the safety and stability of the internal wiring of the battery pack 1000.

[0050] Please see Figure 2 , Figure 3 and Figure 4 According to some embodiments of this application, at least two oppositely arranged side beams 121 may include a vertical section 1211 and a mounting section 1212. The vertical section 1211 is provided with a first cavity 1211a, and an opening 1211b is provided on the inner side wall of the vertical section 1211. The mounting section 1212 is connected to the outer side wall of the vertical section 1211, and a second cavity 1212a is provided in the mounting section 1212. The opening 1211b and the second cavity 1212a have an overlapping portion in the thickness direction of the vertical section 1211.

[0051] At least two opposing side beams 121 include a vertical section 1211 and a mounting section 1212. The vertical section 1211 extends along the height direction. In the entire battery pack 1000 structure, the vertical section 1211 mainly plays the key role of enclosing the cavity. The first cavity 1211a is located inside the vertical section 1211, and the opening 1211b is located on the inner sidewall of the vertical section 1211.

[0052] The mounting section 1212 can extend horizontally in the transverse direction. Its main function is to connect with the vehicle body. The mounting section 1212 is tightly connected to the outer wall of the vertical section 1211 and can also be integrally formed by extrusion molding, ensuring the stability of the connection between the two. The mounting section 1212 has a second cavity 1212a, which improves the structural strength of the mounting section 1212 itself and ensures the stability of the battery pack 1000 mounting. In the thickness direction of the vertical section 1211, the opening 1211b and the second cavity 1212a overlap. When the battery pack 1000 is subjected to external force, the vertical section 1211 bears the main stress by means of the first cavity 1211a. Although the opening 1211b is a thin-walled structure, thanks to the overlap with the second cavity 1212a, the second cavity 1212a can provide additional support for the area of ​​the opening 1211b, thereby further ensuring the stability of the overall structure.

[0053] Please see Figure 1 , Figure 2 and Figure 5 According to some embodiments of this application, a plurality of expansion beams 130 may be provided in the cavity. The plurality of expansion beams 130 are arranged at intervals on the base plate 110 along the cell stacking direction of the cell assembly 200 to divide the cavity into a plurality of chambers distributed along the cell stacking direction. The cell assembly 200 is installed between two adjacent expansion beams 130, and the end of the cell assembly 200 in the cell stacking direction abuts against the two expansion beams 130.

[0054] Multiple expansion beams 130 are spaced apart on the base plate 110 within the cavity of the battery pack 1000, along the cell stacking direction of the cell assembly 200. The spacing of the expansion beams 130 is precisely designed and determined based on the dimensional parameters of the cell assembly 200 and the overall spatial layout of the battery pack 1000, ensuring that the space between two adjacent expansion beams 130 precisely matches the installation dimensions of the cell assembly 200. During the installation of the cell assembly 200, the cell assembly 200 is precisely placed between two adjacent expansion beams 130, with the ends of the cell assembly 200 in the cell stacking direction closely abutting against the two expansion beams 130, thereby achieving a stable positioning of the cell assembly 200 within the battery pack 1000.

[0055] The expansion beam 130 divides the cavity into multiple chambers. Specifically, each chamber can be a cell chamber, a power distribution chamber, and an accessory chamber. Each chamber is isolated from the others to ensure that the chambers will not affect each other when the cell experiences thermal runaway, thus increasing the safety of the battery pack 1000.

[0056] When the battery pack 1000 is in normal operating condition, the battery cells will expand to a certain extent due to charging and discharging processes. The expansion beam 130, with its unique structural design, suppresses this expansion. Its structure possesses sufficient strength to effectively resist the pressure generated by the cell expansion, keeping the expansion level within a safe threshold range. This ensures stable cell operation and the integrity of the internal structure of the battery pack 1000.

[0057] When an abnormal situation occurs inside the battery pack 1000, such as a rapid rise in temperature due to an abnormal chemical reaction inside the battery, which intensifies the expansion of the battery cell, the expansion beam 130 utilizes the deformable characteristics of its own structure to buffer the additional expansion pressure of the battery cell through appropriate deformation. On the other hand, the high strength of its structure continuously suppresses the excessive expansion of the battery cell, preventing the battery cell from being damaged due to excessive compression.

[0058] Please see Figure 5 , Figure 6 and Figure 7 According to some embodiments of this application, the top of the battery cell assembly 200 may be provided with a clamping member 140, and the end of the clamping member 140 is fixedly connected to two adjacent expansion beams 130.

[0059] The clamping member 140 can be used to increase the clamping force on the cell assembly 200 and further stabilize the position of the cell assembly 200 within the battery pack 1000. During battery pack 1000 operation, the cells are prone to displacement due to expansion during charging and discharging, as well as vibrations from vehicle movement. The clamping member 140, by applying force to the top of the cell assembly 200, combined with the constraint of the expansion beam 130 on the sides of the cell assembly 200, comprehensively restricts the movement of the cell assembly 200, greatly improving the stability of the internal structure of the battery pack 1000.

[0060] The end of the clamping member 140 is securely connected to the two adjacent expansion beams 130. Common connection methods include bolting, riveting, or using special snap-fit ​​connections. These connection methods ensure that the clamping member 140 and the expansion beams 130 form a stable integral structure, which can effectively transmit the constraint force on the battery cell assembly 200.

[0061] The clamping element 140 can take many forms, such as a pressure strip or a pull strip.

[0062] In one example, when the clamping element 140 is in the form of a clamping strip, the clamping strip is generally made of high-strength aluminum alloy. Aluminum alloy is lightweight and high-strength, enabling it to apply stable and sufficient pressure to the top of the cell assembly 200 without significantly increasing the weight of the battery pack 1000. The length and width of the clamping strip are precisely designed according to the dimensions of the top of the cell assembly 200, ensuring uniform coverage and effective application to the top of the cell assembly 200. The ends of the clamping strip can be fixed to the top of the expansion beam 130 with bolts. Bolts are passed through the threaded holes on the clamping strip and the expansion beam 130 and tightened with nuts to ensure a tight connection between the clamping strip and the expansion beam 130, forming a stable overall structure. This connection method allows the pressure applied to the top of the cell assembly 200 by the clamping strip to be effectively transmitted to the expansion beam 130, thereby coordinating with the constraint effect of the expansion beam 130 on the sides of the cell assembly 200, comprehensively restricting the displacement of the cell assembly 200, and greatly improving the stability of the internal structure of the battery pack 1000.

[0063] In another example, if a pull bar is used as the clamping element 140, the pull bar is typically made of high-strength alloy steel. The alloy steel bar possesses excellent tensile strength, enabling it to apply an upward pulling force from the top of the cell assembly 200 under tension, working in conjunction with the lateral constraint of the expansion beam 130 to suppress cell expansion and displacement. Both ends of the pull bar are connected to the expansion beam 130 via specially designed connectors. One end of the connector is securely connected to the pull bar, while the other end is reliably fixed to the expansion beam 130, ensuring that the pulling force of the pull bar is effectively transmitted to the cell assembly 200.

[0064] Please see Figure 6 and Figure 7According to some embodiments of this application, the thickness of the expansion beam 130 may increase from top to bottom.

[0065] During the operation of the battery pack 1000, especially in fast charging scenarios, the expansion rate and magnitude of the battery cells increase significantly. At this time, the lower part of the expansion beam 130 must not only bear the weight of the battery cell assembly 200 itself, but also cope with the strong compressive force generated by the rapid expansion of the cells. The thicker design of the lower part of the expansion beam 130 provides stronger structural strength, effectively resisting these greater pressures and greatly preventing deformation or even damage to the lower part of the expansion beam 130. The relatively thinner design of the upper part of the expansion beam 130 reduces the overall weight of the expansion beam 130, achieving an optimized balance between structural strength and lightweight design. Combined with the top constraint of the pressure strip, this further enhances the restraint effect on the battery cells, effectively suppressing excessive expansion and displacement of the cells during fast charging. This provides a solid guarantee for the battery pack 1000 to meet fast charging performance requirements, ensuring stable and efficient operation of the battery pack 1000 in fast charging mode.

[0066] Please see Figure 1 According to some embodiments of this application, the battery pack 1000 also includes a cover 200, which covers the top of a plurality of side beams 121. The cover 200 may be provided with a first reinforcing rib 210 extending along the stacking direction of the battery cells at the position corresponding to the battery cell group 200, and the periphery of the cover 200 may be provided with a plurality of second reinforcing ribs 220 evenly distributed along its circumference.

[0067] The cover 200 can be made of aluminum alloy material that is compatible with the material of the side beam 121 and the base plate 110 to ensure the consistency and stability of the entire battery pack 1000 structure; or it can be made of composite material to ensure structural strength while meeting the requirements of lightweight design.

[0068] The cover 200 is precisely placed on top of the multiple side beams 121, ensuring that the edges of the cover 200 fit tightly against the top of the side beams 121. A secure fixing method, such as bolts, can be used to firmly fix the cover 200 to the side beams 121, thus forming a closed space for the battery pack 1000 and providing effective protection for the internal cell assembly 200.

[0069] A first reinforcing rib 210 extending along the cell stacking direction is provided at the position corresponding to the cover 200 and the cell assembly 200. The first reinforcing rib 210 can enhance the structural strength of the area of ​​the cover 200 corresponding to the cell assembly 200. When manufacturing the cover 200, the first reinforcing rib 210 and the cover 200 can be manufactured simultaneously by die stamping or integral molding process. The number and spacing of the first reinforcing ribs 210 are reasonably planned according to the size of the cell assembly 200 and the area of ​​the cover 200 to ensure that the pressure from above can be evenly distributed, prevent the cover 200 from deforming due to uneven stress, and thus provide good protection for the cell assembly 200.

[0070] The cover 200 has a plurality of second reinforcing ribs 220 evenly distributed along its circumference. These second reinforcing ribs 220 are arranged around the edge of the cover 200 and can be manufactured using die stamping or integral molding processes. These second reinforcing ribs 220 effectively increase the strength of the edge of the cover 200 and strengthen the stability of the connection between the cover 200 and the side beam 121. When the battery pack 1000 is subjected to external impact or vibration, the second reinforcing ribs 220 can better distribute the impact force throughout the cover 200 and the side beam 121 structure, reducing the risk of loosening or damage at the connection points.

[0071] Please see Figure 1 According to some embodiments of this application, the top of the cover 200 may be provided with a buffer 230; the buffer 230 is disposed intersecting with the first reinforcing rib 210.

[0072] The battery pack 1000 is installed inside the vehicle body. During vehicle operation, the vehicle body will generate various vibrations. If these vibrations are directly transmitted to the cover 200, they may affect the stable operation of the battery cell pack 200. At the same time, the cover 200 may deform and bulge under various external forces during vehicle operation, which may lead to vibration and abnormal noise problems.

[0073] A buffer element 230 is provided on the top of the cover 200. The buffer element 230 is located between the cover 200 and the vehicle body structure and plays a buffering role. There can be multiple buffer elements 230, which are evenly distributed on the top of the cover 200.

[0074] The cushioning element 230 can be a rubber pad or foam, etc. Taking foam as an example, the foam is soft and elastic, and has excellent shock absorption and cushioning performance. The foam can be tightly bonded to the top surface of the cover 200 with a high-strength adhesive layer.

[0075] When the vehicle is in motion, the vehicle body structure exerts a certain degree of compression on the foam attached to the top of the cover 200. During the compression process, the tiny pores inside the foam deform, effectively absorbing and dispersing vibration energy, greatly reducing the amplitude of vibration transmitted to the cover 200. At the same time, because the foam is continuously subjected to the compressive force of the vehicle body structure, when the cover 200 tends to deform and bulge, the foam can provide timely reverse support to prevent the cover 200 from deforming and bulging, thereby avoiding abnormal vibration and noise caused by the deformation and bulging of the cover 200.

[0076] The foam is arranged along the top surface of the cover 200, intersecting with the first reinforcing rib 210, with some foam extending across the first reinforcing rib 210. This intersecting arrangement allows the foam to not only buffer vibrations but also benefit from the structural support of the first reinforcing rib 210, further enhancing the buffering effect. Simultaneously, the intersecting arrangement does not interfere with the function of the first reinforcing rib 210 in strengthening the structural strength of the area corresponding to the battery pack 200 within the cover 200, and also makes efficient use of the top space of the cover 200. In one example, the buffer element 230 is arranged perpendicularly to the first reinforcing rib 210.

[0077] Please see Figure 1 According to some embodiments of this application, the base plate 110 may be provided with an exhaust chamber, the top of the base plate 110 is provided with an exhaust hole 111 communicating with the exhaust chamber, and the bottom of the battery cell assembly 200 is provided with an explosion-proof valve corresponding to the exhaust hole 111.

[0078] The base plate 110 employs a specific double-layer or multi-layer composite structure to construct the exhaust chamber. During manufacturing, a closed and continuous cavity is created inside the base plate 110 using a precise mold forming process, serving as the exhaust chamber. The exhaust chamber is rationally distributed along the length and width of the base plate 110, and its position precisely corresponds to the explosion-proof valve at the bottom of the cell assembly 200, ensuring that it can immediately receive and handle the emitted high-temperature gases in the event of thermal runaway of the cell.

[0079] At the top of the base plate 110, an exhaust port 111 communicating with the exhaust chamber is provided. The number, size, and distribution of the exhaust ports 111 are precisely designed based on the size and number of the cell pack 200 and the estimated gas generation inside the battery pack 1000. When the gas pressure inside the cell pack 200 rises sharply due to abnormal chemical reactions or other reasons, triggering thermal runaway, the explosion-proof valve will respond quickly and automatically open when its set opening pressure is reached. At this time, the high-temperature and high-pressure gas inside the cell pack 200 is discharged through the explosion-proof valve and directly enters the corresponding exhaust chamber below.

[0080] The exhaust chamber effectively prevents high-temperature gases from entering other chambers of the battery pack 1000. In the event of thermal runaway of a cell, the exhaust chamber rapidly guides the high-temperature gases to the outside of the battery pack 1000, significantly reducing the internal gas pressure of the cell assembly 200 and preventing serious safety accidents such as explosions caused by excessive gas pressure. Simultaneously, the successful thermal-electrical separation effectively prevents the spread of high-temperature gases within the battery pack 1000, eliminating the risk of thermal diffusion from the battery pack 1000 at its source.

[0081] This application embodiment also provides a vehicle, which includes a battery pack 1000 as described in any of the above technical solutions, the battery pack 1000 being used to supply power to the vehicle.

[0082] It should be noted that since the vehicle provided in this application embodiment includes a battery pack 1000 of any of the above technical solutions, it has the technical features and effects of the battery pack 1000 of any of the above technical solutions, which will not be repeated here.

[0083] According to the vehicle provided in this application embodiment, by providing an opening 1211b on the inner sidewall of the side beam 121, the material used in the side beam 121 is reduced while ensuring the overall structural strength, thereby reducing the weight of the frame 120, achieving a lightweight design of the housing 100, increasing battery energy density, and thus improving range. While meeting structural strength requirements, the safety and NVH (Noise, Vibration, Harshness) performance of the battery pack 1000 are also guaranteed, avoiding personal injury and property damage to users.

[0084] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0085] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0086] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0087] In the description of this application, "multiple" means two or more.

[0088] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0089] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0091] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized by, The battery pack comprises a box body and a cell group, wherein the box body comprises: a bottom plate; a frame mounted on the bottom plate, the frame comprising a plurality of side beams distributed along the periphery of the bottom plate, the bottom plate and the plurality of side beams defining a cavity for mounting the cell group; wherein the side beams are provided with a plurality of first cavities distributed in the height direction, and the inner side wall of the side beam is provided with an opening at the upper portion, the opening extending along the extension direction of the side beam.

2. The battery pack of claim 1, wherein, The opening is provided with a flange extending in the height direction of the side beam.

3. The battery pack of claim 1, wherein, At least two oppositely arranged side beams comprise a facade portion and a hanging portion, the facade portion is provided with the first cavity, the opening is arranged on the inner side wall of the facade portion, the hanging portion is connected with the outer side wall of the facade portion, the hanging portion is provided with a second cavity, and the opening and the second cavity have an overlapping portion in the thickness direction of the facade portion.

4. The battery pack of any one of claims 1-3, wherein, The cavity is provided with a plurality of expansion beams, the plurality of expansion beams are arranged on the bottom plate in the stacking direction of the cell group to divide the cavity into a plurality of chambers distributed in the stacking direction of the cell group; wherein the cell group is mounted between two adjacent expansion beams, and the end portion of the cell group in the stacking direction of the cell group abuts against the two expansion beams.

5. The battery pack of claim 4, wherein, The top portion of the cell group is provided with a pressing member, and the end portion of the pressing member is fixedly connected with two adjacent expansion beams.

6. The battery pack of claim 5, wherein, The thickness of the expansion beam has an increasing trend from top to bottom.

7. The battery pack of any one of claims 1-3, wherein, The battery pack further comprises a cover body, the cover body covers the top portion of the plurality of side beams, the cover body is provided with a first reinforcing rib extending in the stacking direction of the cell group at the corresponding position of the cell group, and the periphery of the cover body is provided with a plurality of second reinforcing ribs uniformly distributed in the circumferential direction.

8. The battery pack of claim 7, wherein, The top portion of the cover body is provided with a buffer member; The buffer member intersects with the first reinforcing rib.

9. The battery pack of any one of claims 1-3, wherein, The bottom plate is provided with an exhaust cavity, the top portion of the bottom plate is provided with an exhaust hole communicating with the exhaust cavity, and the bottom portion of the cell group is provided with an explosion-proof valve corresponding to the exhaust hole.

10. A vehicle characterized by comprising: The battery pack comprises the battery pack according to any one of claims 1-9, and the battery pack is used for supplying power to the vehicle.

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