Battery pack bottom protection structure, battery pack and automobile

Abstract

The utility model provides a battery pack bottom protection structure, a battery pack and an automobile. The battery pack bottom protection structure comprises a bottom protection plate and a protection frame, the protection frame and the bottom protection plate are arranged in a stacked mode and fixedly connected so as to support the bottom protection plate, the bottom protection plate can directly face possible impact, scraping and the like of the outside, damage to the bottom of the battery pack caused by road stone impact, sundries scraping and the like can be effectively prevented, and the protection frame and the bottom protection plate are arranged in a stacked mode and fixedly connected so that the battery pack can be protected. When the bottom of the battery pack is impacted by an external force, the protective frame can bear an impact load by virtue of the structural strength of the protective frame, and the impact force is conducted and dispersed along the structural path of the frame, so that the external force can be effectively dispersed, stress concentration is avoided, meanwhile, reverse supporting force is provided for the bottom protective plate, and stable and reliable support is provided for the bottom protective plate; therefore, the impact resistance of the battery pack bottom protection structure is enhanced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a bottom protection structure for a battery pack, a battery pack, and an automobile. Background Technology

[0002] New energy vehicles typically use lithium batteries for power. Currently, most battery packs are located inside the car chassis, in a low position under the vehicle. If the bottom of the car is impacted, the battery pack may be squeezed and deformed, potentially causing internal damage, short circuits, and even spontaneous combustion or explosion. Related technologies usually protect the battery pack by setting up a bottom protective structure. However, conventional bottom protective structures for battery packs are mostly flat metal plate structures, such as stamped steel plates. But flat metal plate structures have poor impact resistance. When impacted, the battery pack above the impact point is easily squeezed and damaged, failing to effectively protect the battery pack. Utility Model Content

[0003] This application discloses a bottom protection structure for a battery pack, a battery pack, and an automobile, which can improve the impact resistance of the bottom protection and structure of the battery to effectively protect the battery pack.

[0004] To achieve the above objectives, this application discloses a bottom protection structure for a battery pack, the bottom protection structure of which includes:

[0005] Bottom guard plate;

[0006] A protective frame is stacked on top of and fixedly connected to the bottom protective plate to support the bottom protective plate.

[0007] Optionally, the protective frame includes a plurality of support bars spaced apart along a first direction, and the plurality of support bars are respectively fixedly connected to the bottom protective plate, wherein the first direction is parallel to the surface of the bottom protective plate.

[0008] Optionally, the cross-section of the support bar is an I-shaped structure or a convex structure.

[0009] Optionally, when the support bar has an I-shaped cross-section, the thickness of the upper and lower flanges of the I-shaped structure is 1mm-20mm and the thickness of the web is 2mm-40mm along the stacking direction of the protective frame and the bottom protective plate.

[0010] Optionally, when the support strip has a U-shaped cross-section, the thickness of the protruding part of the U-shaped structure is 3mm-60mm and the thickness of the bottom part is 1mm-20mm along the stacking direction of the protective frame and the bottom protective plate.

[0011] Optionally, along the stacking direction of the protective frame and the bottom protective plate, the protective frame includes a first surface and a second surface disposed opposite to each other;

[0012] When there is one bottom guard plate, the bottom guard plate is disposed on the first surface or the second surface;

[0013] When there are two bottom protective plates, one bottom protective plate is disposed on the first surface and the other bottom protective plate is disposed on the second surface.

[0014] Optionally, the protective frame and / or the bottom guard plate may be made of aluminum alloy or steel.

[0015] Optionally, the bottom protective plate may comprise fiberglass material, carbon fiber material, or steel mesh.

[0016] Optionally, the thickness of the bottom protective plate is 1mm-6mm along the stacking direction of the bottom protective plate and the protective frame.

[0017] Optionally, the protective frame is provided with filler.

[0018] Optionally, the filler includes adhesive-backed foam or potting compound.

[0019] Optionally, the surface of the filler is bonded and fixed to the bottom cover plate.

[0020] This application also discloses a battery pack, comprising:

[0021] Box;

[0022] The battery cells are housed within the casing.

[0023] The aforementioned bottom protective structure of the battery pack is located below the battery cell, and the protective frame is fixedly connected to the housing.

[0024] This application also discloses an automobile including the aforementioned battery pack.

[0025] Compared with the prior art, the beneficial effects of this application are as follows:

[0026] In this application, the bottom guard plate directly faces potential impacts and scratches from the outside environment, effectively preventing damage to the bottom of the battery pack from road stones or debris. This provides the first line of defense for the battery pack, reducing the risk of malfunction due to bottom damage. The protective frame is stacked and fixedly connected to the bottom guard plate. When the bottom of the battery pack is impacted by external forces, the protective frame can withstand the impact load with its own structural strength and conduct and disperse the impact force along the structural path of the frame. This effectively disperses external forces, avoids stress concentration, and provides reverse support to the bottom guard plate, preventing damage due to excessive stress and deformation or damage due to excessive local stress. This provides stable and reliable support for the bottom guard plate, ensuring its continuous protective function. This enhances the impact resistance of the battery pack's bottom protective structure. During vehicle operation, whether encountering bumpy roads or other complex conditions, it better maintains structural integrity, reduces the impact of vibration and shaking on the battery pack, and ensures normal operation of the battery pack. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a bottom protection structure for a battery pack provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of another battery pack bottom protection structure provided in an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of the bottom protection structure of a battery pack with two bottom protective plates provided in the embodiments of this application;

[0031] Figure 4 This is a schematic diagram of another battery pack bottom protection structure provided in an embodiment of this application;

[0032] Figure 5 yes Figure 3 Enlarged view of point A in the middle;

[0033] Figure 6 yes Figure 4 Enlarged view of point B in the middle;

[0034] Figure 7 The cross-sectional view of the support bar with an I-shaped structure provided in this application embodiment is shown.

[0035] Figure 8This is a cross-sectional view of a support strip with a convex-shaped cross-section provided in an embodiment of this application;

[0036] Figure 9 This is a cross-sectional view of a support strip with a convex-shaped structure provided in another embodiment of this application;

[0037] Figure 10 This is a schematic diagram of the bottom protective structure of a battery pack with filler within the protective frame provided in this application embodiment;

[0038] Figure 11 This is a schematic diagram of another battery pack bottom protection structure with filler inside the protective frame provided in this application embodiment;

[0039] Figure 12 This is a schematic diagram of another battery pack bottom protection structure with filler inside the protective frame provided in this application embodiment;

[0040] Figure 13 This is a schematic diagram of a battery pack provided in an embodiment of this application.

[0041] Explanation of main figure symbols

[0042] 1-Battery pack bottom protective structure;

[0043] 100-bottom guard plate;

[0044] 200 - Protective frame; 210 - Support bar;

[0045] 300 - Filler;

[0046] 2-Battery pack;

[0047] 10-Box body; 11-Connecting beam;

[0048] 20 - Top cover;

[0049] 30-Liquid cooling plate;

[0050] 40-cell. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0053] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0054] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0055] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components whose specific types and structures may be the same or different, and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0056] As mentioned in the background section, conventional battery packs typically have a flat metal plate protective plate structure at the bottom, such as stamped steel plates. However, flat metal plate protective plate structures have poor impact resistance. When impacted, the battery pack above the impact point is easily squeezed and damaged, failing to effectively protect the battery pack.

[0057] To address the aforementioned issues, this application involves stacking and fixing the protective frame and the bottom protective plate together. When the bottom of the battery pack is subjected to an external impact, the protective frame can withstand the impact load with its own structural strength and transmit and disperse the impact force along the structural path of the frame. This effectively disperses the external force, avoids stress concentration, and provides a reverse support force to the bottom protective plate, thus providing stable and reliable support and enhancing the impact resistance of the bottom protective structure of the battery pack.

[0058] The technical solutions of the battery pack bottom protection structure, battery pack, and automobile of this application will be further described below with reference to specific embodiments and accompanying drawings.

[0059] See Figures 1 to 3 This embodiment provides a bottom protection structure 1 for a battery pack. The bottom protection structure 1 for the battery pack includes a bottom protective plate 100 and a protective frame 200. The protective frame 200 is stacked on top of the bottom protective plate 100 and is fixedly connected to the bottom protective plate 100 to support the bottom protective plate 100.

[0060] Therefore, the bottom protective plate 100 can directly face potential impacts and scratches from the outside world, effectively preventing damage to the bottom of the battery pack from road stones or debris, providing the first line of defense for the battery pack and reducing the risk of battery pack failure due to bottom damage. The protective frame 200 is stacked and fixedly connected to the bottom protective plate 100. When the bottom of the battery pack is impacted by external forces, the protective frame 200 can withstand the impact load with its own structural strength and transmit and disperse the impact force along the structural path of the frame, effectively dispersing external forces and preventing damage. The force is concentrated, and at the same time, it provides reverse support force to the bottom guard plate 100, preventing the bottom guard plate 100 from being damaged due to excessive force, avoiding deformation or damage to the bottom guard plate 100 due to excessive local force, providing stable and reliable support for the bottom guard plate 100, ensuring that the bottom guard plate 100 can continuously play a protective role, thereby enhancing the impact resistance of the bottom protective structure 1 of the battery pack. During vehicle operation, whether encountering bumpy roads or other complex working conditions, it can better maintain the structural integrity, reduce the impact of vibration, shaking and other factors on the battery pack, and ensure the normal operation of the battery pack.

[0061] In one possible embodiment, see Figures 1 to 3 The protective frame 200 includes a plurality of support bars 210 spaced apart along a first direction. The plurality of support bars 210 are fixedly connected to the bottom protective plate 100 respectively, and the first direction is parallel to the surface of the bottom protective plate 100.

[0062] By arranging multiple support bars 210 at intervals along a first direction parallel to the surface of the bottom protective plate 100 and fixing them to the bottom protective plate 100, a uniform and stable support system is formed. When the bottom protective plate 100 is subjected to external impact, the impact force will be dispersed to the surrounding areas along the first direction through the support bars 210. Since the support bars 210 are distributed at intervals, the impact force will not be concentrated at a certain point or in a certain area, but will be uniformly transmitted to the entire protective frame 200. This reduces the impact intensity borne by a single point, enhances the impact resistance of the protective frame 200, and thus improves the impact resistance performance of the bottom protective structure 1 of the battery pack.

[0063] Of course, the protective frame 200 is not limited to the above forms. For example, the protective frame 200 can also be a grid-like frame, composed of intersecting metal strips forming a grid shape, or an integrated molded frame, manufactured using a one-time molding process, such as integral casting or molding, etc. Those skilled in the art should know the forms of the protective frame 200.

[0064] In one possible embodiment, see Figures 3 to 6 The cross-section of the support bar 210 is an I-shaped structure or a convex structure.

[0065] The I-shaped support bar 210 has upper and lower flanges and a web, which results in a large moment of inertia. When subjected to bending force, the upper and lower flanges mainly bear tensile and compressive forces, while the web resists shear force. This division of labor and cooperation improves the bending resistance of the support bar 210. For example, when the bottom guard plate 100 is subjected to a large lateral impact force, the I-shaped support bar 210 can effectively resist bending deformation, ensure the stable support of the bottom guard plate 100, and prevent the bottom guard plate 100 from collapsing locally due to the bending of the support bar 210.

[0066] For the support bar 210 with a convex shape, its protruding part can increase the section modulus when subjected to bending force. Especially when subjected to unidirectional bending force, the protruding part can provide additional support and enhance the overall bending resistance.

[0067] In addition, both the I-shaped and U-shaped structures provide a large connection area for the connection with the bottom guard plate 100. For example, the upper and lower flanges of the I-shaped structure can be firmly connected to the bottom guard plate 100 by welding, riveting, etc., which increases the stability of the connection. The bottom plane of the U-shaped structure can also fit tightly with the bottom guard plate 100, ensuring that the connection between the support bar 210 and the bottom guard plate 100 will not easily loosen when subjected to various external forces, thus ensuring the effective support of the protective frame 200 for the bottom guard plate 100.

[0068] In one possible embodiment, see Figure 7 When the support bar 210 has an I-shaped cross-section, along the stacking direction of the protective frame 200 and the bottom protective plate 100, the thickness of the upper and lower flanges of the I-shaped structure is 1mm-20mm, and the thickness of the web is 2mm-40mm.

[0069] The thickness of the upper and lower flanges is Figure 7 The dimensions referred to by a1 and c1 are the same as the web thickness referred to by b1.

[0070] By keeping the thickness of the upper and lower flanges within the range of 1mm-20mm, sufficient bending section modulus can be provided for the structure while ensuring that the weight of the support bar 210 is not excessive. When the battery pack is subjected to bending force due to road bumps or other conditions during vehicle operation, the flanges of appropriate thickness can effectively resist bending moment and reduce the degree of bending deformation of the support bar 210. For example, when encountering large potholes, the bottom of the battery pack will be subjected to a large bending moment. At this time, the flange thickness within this range can keep the support bar 210 in good shape and prevent excessive bending from affecting the safety of the battery pack. Furthermore, the upper and lower flanges cooperate with the web plate with a thickness of 2mm-40mm. While the web plate provides a shear-resistant foundation, the flanges and the web plate work together to share the bending stress, making the entire I-shaped structure a highly efficient whole in terms of bending resistance, thus improving the bending protection capability of the support bar 210 for the bottom of the battery pack.

[0071] Furthermore, this size range offers better compatibility with other components and structures at the bottom of the battery pack. During assembly, it can better cooperate with the bottom guard plate 100 and other connecting parts. It will not cause assembly difficulties or affect the compactness of the overall structure due to the support bar 210 being too large or too small. At the same time, the appropriate thickness allows the support bar 210 to form a good connection with the bottom guard plate 100 when it is installed at the bottom of the battery pack. It will not take up too much space due to the connection part being too thick, nor will it be too thin to cause the connection to be weak. This ensures the coordination and stability of the protective frame 200 and the overall structure of the battery pack.

[0072] in addition, Figure 7 The dimension referred to by d1 can be 4mm-40mm, and the dimension referred to by e1 can be 2mm-20mm.

[0073] In one possible embodiment, see Figure 8 When the cross section of the support bar 210 is a convex structure, along the stacking direction of the protective frame 200 and the bottom protective plate 100, the thickness of the protruding part of the convex structure is 3mm-60mm, and the thickness of the bottom is 1mm-20mm.

[0074] The thickness of the protruding part is Figure 8 The dimension indicated by b2 in the middle, and the dimension indicated by the bottom thickness c2.

[0075] The thickness of the raised portion of the U-shaped structure is 3mm-60mm, which ensures that the support bar 210 has sufficient material to resist compressive deformation when subjected to pressure perpendicular to the surface of the bottom guard plate 100. The appropriate thickness of the raised portion ensures the contact area between the support bar 210 and the pressure surface, which can evenly distribute the pressure to the entire support structure, reduce the pressure per unit area, and thus improve the compressive strength of the support bar 210. This effectively prevents the support bar 210 from excessively deforming or being damaged under heavy pressure. The bottom thickness of 1mm-20mm also provides a certain degree of bending resistance. Working in conjunction with the raised portion, the entire U-shaped structure can better maintain its shape when subjected to bending force, reduce bending deformation, and enhance the bending protection of the support bar 210 for the protective frame 200 and the bottom guard plate 100 in the lateral direction.

[0076] in addition, Figure 8 The dimension referred to by d2 can be 4mm-40mm, and the dimension referred to by e2 can be 2mm-20mm.

[0077] Of course, the convex structure can also be Figure 9 The form referred to herein has a protruding portion that can extend away from the bottom of the battery pack. b3 can be 3mm-60mm, a1 can be 1mm-20mm, d3 can be 4mm-40mm, and e3 can be 2mm-20mm.

[0078] In one possible embodiment, see Figures 1 to 3 Along the stacking direction of the protective frame 200 and the bottom protective plate 100, the protective frame 200 includes a first surface and a second surface disposed opposite to each other; when there is one bottom protective plate 100, the bottom protective plate 100 is disposed on the first surface or the second surface; when there are two bottom protective plates 100, one bottom protective plate 100 is disposed on the first surface and the other bottom protective plate 100 is disposed on the second surface.

[0079] See Figure 1 and Figure 2 When there is one bottom guard plate 100, the bottom guard plate 100 can be installed on the first or second surface of the protective frame 200 according to the actual use scenario and risk direction. This can concentrate protective resources and effectively resist major risks. For example, in vehicles driving on ordinary urban roads, the bottom of the battery pack is more likely to be damaged by road debris, small stones, etc. Installing the bottom guard plate 100 on the first surface close to the road can directly block these damages and protect the battery pack.

[0080] See Figure 3When there are two bottom protective plates 100, the two bottom protective plates 100 are symmetrically distributed on both sides of the protective frame 200, so that the protective frame 200 is subjected to more uniform force in all directions. When subjected to external forces from different directions, the protective frame 200 can use the two bottom protective plates 100 to evenly distribute the force, which can improve the overall stability and reliability of the battery pack bottom protective structure 1.

[0081] In one possible embodiment, the protective frame 200 and / or the bottom guard plate 100 comprises aluminum alloy or steel.

[0082] The protective frame 200 and / or the bottom guard plate 100 are made of aluminum alloy or steel. It should be understood that both the protective frame 200 and the bottom guard plate 100 are made of aluminum alloy or steel, or one of the protective frame 200 and the bottom guard plate 100 is made of aluminum alloy or steel, without limitation.

[0083] Aluminum alloy has a lower density, which significantly reduces the weight of the bottom protective structure 1 of the battery pack compared to traditional steel. In vehicle applications, weight reduction helps to reduce the overall energy consumption of the vehicle. In addition, a dense oxide film can naturally form on the surface of aluminum alloy. This oxide film has good corrosion resistance and can effectively resist the erosion of the bottom protective structure 1 of the battery pack by corrosive environments such as humidity and acid and alkali. For example, in some humid coastal areas or areas with severe industrial pollution, the use of aluminum alloy protective frame 200 and bottom plate 100 can extend the service life of the bottom protective structure 1 of the battery pack and reduce structural damage and decline in protective performance caused by corrosion.

[0084] Steel has high strength and toughness, and can withstand greater impact and pressure. When faced with extreme external forces, such as severe collisions or impacts from large stones, the steel battery pack bottom protection structure 1 can effectively protect the battery pack from damage due to its excellent mechanical properties. For example, in engineering vehicles or heavy transport vehicles, the battery pack may be subjected to greater impact and vibration. The high strength and high toughness of steel can ensure that the battery pack bottom protection structure 1 maintains its structural integrity under such harsh working conditions.

[0085] In one possible embodiment, the bottom guard plate 100 includes fiberglass material, carbon fiber material, or steel mesh.

[0086] The bottom protective plate 100 can be a composite material reinforced with glass fiber, carbon fiber, steel mesh, or any combination of glass fiber, carbon fiber, and steel mesh, etc., without any limitation.

[0087] Glass fiber reinforced, carbon fiber reinforced, steel mesh reinforced composite materials and their combinations have low density (glass fiber is about 2.5-2.7 g / cm3, carbon fiber is about 1.7-1.8 g / cm3), and steel mesh reinforced composite materials can also control weight through reasonable design. They can also be customized with structural designs, such as hollow or honeycomb structures, and can be integrally molded to reduce connecting parts. With their high strength and high rigidity, they can replace traditional metal materials to achieve weight reduction while meeting usage requirements.

[0088] In one possible embodiment, the thickness of the bottom protective plate 100 is 1mm-6mm along the stacking direction of the bottom protective plate 100 and the protective frame 200.

[0089] With a thickness range of 1mm-6mm, it can be well adapted to various types and specifications of protective frames 200. Whether it is a lightweight aluminum alloy protective frame or a heavy-duty steel structure protective frame, the bottom guard plate 100 can be matched with it through reasonable connection methods to form a stable structural system and meet the needs of different equipment and projects.

[0090] In one possible embodiment, see Figures 10 to 12 The protective frame 200 is filled with filler 300.

[0091] The filler 300 can buffer the bottom guard plate 100 when it is subjected to external impact, absorb and disperse the impact force, reduce the direct effect of external force on the equipment or structure, reduce the risk of damage caused by impact, protect the safety of key components and structures inside the battery pack, and fill the space inside the protective frame 200, making the entire structure of the protective frame 200 more compact and stable, increasing the overall rigidity and strength of the bottom protective structure 1 of the battery pack, improving the bottom guard plate 100's ability to resist deformation and torsion, and ensuring good structural integrity during use.

[0092] In one possible embodiment, the filler 300 comprises adhesive-backed foam or potting compound.

[0093] Among them, the adhesive foam material can be selected from foamed polyphenylene ether, foamed polypropylene, foamed polyethylene, foamed silicone, foamed polyurethane, rubber, etc., and the potting compound can be selected from epoxy resin potting compound, polyurethane potting compound, and silicone resin potting compound, etc., without limitation.

[0094] The adhesive-backed foam has good elasticity and softness, and can be quickly compressed and deformed when subjected to external impact, effectively absorbing and dispersing the impact force, providing reliable cushioning protection for the protective frame 200, reducing damage caused by vibration, collision and other factors. In addition, the adhesive-backed foam can closely adhere to the surface of the bottom protective plate 100 to form a good sealing effect, effectively blocking the intrusion of external pollutants such as dust, moisture and debris, keeping the internal environment clean and dry, and preventing the performance and life of the battery pack from being affected by dust accumulation or moisture.

[0095] After curing, the potting compound forms a complete and continuous sealing layer that completely encapsulates the components within the protective frame 200, effectively preventing the intrusion of moisture, humidity, chemicals, etc., and providing effective waterproof, moisture-proof, and corrosion-proof protection.

[0096] In one possible embodiment, the surface of the filler 300 is bonded and fixed to the bottom cover 100.

[0097] By bonding and fixing, the filler 300 and the bottom guard plate 100 form an integral structure, which improves the stability of the entire system. When subjected to external forces, they can work together better to bear and distribute the load, reduce deformation or damage caused by uneven local stress, improve the reliability of the overall structure, and prevent the filler 300 from shifting or falling off during use, ensuring that the filler 300 is always in the correct position.

[0098] See Figure 13 This application embodiment also provides a battery pack 2, which includes a housing 10, a battery cell 40, and a bottom protective structure 1 of the battery pack in any of the above embodiments; the battery cell 40 is disposed inside the housing 10, the bottom protective structure 1 of the battery pack is disposed below the battery cell 40, and the protective frame 200 is fixedly connected to the housing 10.

[0099] The battery pack bottom protection structure 1 in this embodiment can have the same structure as the battery pack bottom protection structure 1 in the above embodiments and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments. This embodiment will not be repeated here.

[0100] In this embodiment, by fixing the protective frame 200 to the housing 10, the bottom protective structure 1 of the battery pack and the housing 10 can be connected into a stable whole, which enhances the strength of the entire battery pack 2 structure and can better withstand external pressure and impact. For example, during vehicle operation, it can effectively resist external forces such as road bumps and stone impacts, and protect the internal structure of the battery.

[0101] For example, the battery pack 2 may also include a top cover 20 and a liquid cooling plate 30. The housing 10 may also have an opening, and a connecting beam 11 may be fixedly installed inside the housing 10. The top cover 20 is located at the opening, and the liquid cooling plate 30 is fixedly installed inside the housing 10 and located below the top cover 20. The protective frame 200 is fixedly connected to the connecting beam 11. The liquid cooling plate 30 is composed of a flat plate and a flow channel plate, which are brazed together. The liquid cooling plate 30 is connected to the housing 10 by FDS or friction stir welding. The liquid cooling plate 30 is bonded to the battery cell 40.

[0102] In one possible embodiment, the protective frame 200, the bottom protective plate 100, and the housing 10 are sequentially fixed together by bolts.

[0103] Bolted connections provide high-strength mechanical connection force, tightly combining the protective frame 200, bottom protective plate 100, and housing 10 into a stable overall structure. This effectively resists various external forces, such as vibration, impact, and tension, ensuring that the components do not easily shift or loosen in complex working environments. Furthermore, when subjected to external forces, bolted connections can evenly transmit the force to the protective frame 200, bottom protective plate 100, and housing 10, allowing the entire structure to share the load and avoid localized stress concentration. This improves the deformation resistance and load-bearing capacity of the bottom protective structure 1 of the battery pack, effectively protecting the battery pack 2.

[0104] This application also provides an automobile, which includes the battery pack 2 described above.

[0105] The battery pack 2's housing 10 can be fixed to the vehicle body with bolts.

[0106] In addition, the battery pack 2 in this embodiment can have the same structure as the battery pack 2 in the above embodiments and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments. This embodiment will not be repeated here.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A bottom protective structure for a battery pack, characterized in that, The bottom protective structure of the battery pack includes: Bottom guard plate; A protective frame is stacked on top of and fixedly connected to the bottom protective plate to support the bottom protective plate.

2. The battery pack bottom protective structure according to claim 1, characterized in that, The protective frame includes a plurality of support bars spaced apart along a first direction, and the plurality of support bars are respectively fixedly connected to the bottom protective plate, wherein the first direction is parallel to the surface of the bottom protective plate.

3. The battery pack bottom protective structure according to claim 2, characterized in that, The cross-section of the support bar is an I-shaped structure or a convex structure.

4. The battery pack bottom protective structure according to claim 3, characterized in that, When the support bar has an I-shaped cross-section, along the stacking direction of the protective frame and the bottom protective plate, the thickness of the upper and lower flanges of the I-shaped structure is 1mm-20mm, and the thickness of the web is 2mm-40mm.

5. The battery pack bottom protective structure according to claim 3, characterized in that, When the support bar has a convex cross-section, along the stacking direction of the protective frame and the bottom plate, the thickness of the protruding part of the convex structure is 3mm-60mm, and the thickness of the bottom is 1mm-20mm.

6. The battery pack bottom protective structure according to any one of claims 1-5, characterized in that, Along the stacking direction of the protective frame and the bottom protective plate, the protective frame includes a first surface and a second surface disposed opposite to each other; When there is one bottom guard plate, the bottom guard plate is disposed on the first surface or the second surface; When there are two bottom protective plates, one bottom protective plate is disposed on the first surface and the other bottom protective plate is disposed on the second surface.

7. The battery pack bottom protective structure according to any one of claims 1-5, characterized in that, The protective frame and / or the bottom protective plate are made of aluminum alloy or steel.

8. The battery pack bottom protective structure according to any one of claims 1-5, characterized in that, Along the stacking direction of the bottom protective plate and the protective frame, the thickness of the bottom protective plate is 1mm-6mm.

9. The battery pack bottom protective structure according to any one of claims 1-5, characterized in that, The protective frame is filled with a filler material.

10. The battery pack bottom protective structure according to claim 9, characterized in that, The filler includes adhesive-backed foam or potting compound.

11. A battery pack, characterized in that, include: Box; The battery cells are housed within the casing. The battery pack bottom protection structure according to any one of claims 1-10, wherein the battery pack bottom protection structure is disposed below the battery cell, and the protection frame is fixedly connected to the housing.

12. A car, characterized in that, Includes the battery pack as described in claim 11.

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