Bottom plate, battery pack box body and battery pack

Abstract

The utility model provides a soleplate, battery pack box and battery pack, soleplate includes first plate layer, support layer and second plate layer that set in proper order, first plate layer is located inside battery pack box, second plate layer is located outside battery pack box, the flame retardant property of first plate layer is lower than that of second plate layer, the flame retardant property of second plate layer is lower than that of second plate layer. The strength of the supporting layer is larger than that of the first plate layer and that of the second plate layer. Through the technical scheme provided by the utility model, the problems of heavy weight and high manufacturing cost of the bottom plate in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery development, and in particular to a base plate, a battery pack box and a battery pack. Background Art

[0002] At present, as society pays more attention to sustainable development and environmental protection, the use of lithium batteries can not only reduce dependence on fossil fuels, but also reduce greenhouse gas emissions. The above advantages have enabled them to be widely used in many fields.

[0003] In the prior art, during the processing of lithium battery packs, in order to meet the flame retardant requirements of the battery packs, additional flame retardant layers are processed on the inner and outer sides of the bottom plate of the box. This not only increases the overall weight of the battery pack but also makes the processing technology of the bottom plate complicated and the manufacturing cost high. Utility Model Content

[0004] The utility model provides a base plate, a battery pack box and a battery pack, so as to solve the problems of heavy weight and high manufacturing cost of the base plate in the prior art.

[0005] According to one aspect of the present invention, a base plate is provided, which includes a first plate layer, a support layer and a second plate layer arranged in sequence, the first plate layer is located on the inner side of the battery pack case, and the second plate layer is located on the outer side of the battery pack case, the flame retardant performance of the first plate layer is lower than that of the second plate layer, and the strength of the support layer is greater than the strength of the first plate layer and the strength of the second plate layer.

[0006] Furthermore, the supporting layer includes a frame and a metal plate, and the frame is arranged around the outer periphery of the metal plate.

[0007] Furthermore, there are multiple metal plates, and support bars are arranged in the frame. The support bars cooperate with the frame to form multiple first accommodating areas. The first accommodating areas are used to place the metal plates. The multiple first accommodating areas are arranged in a one-to-one correspondence with the multiple metal plates.

[0008] Furthermore, at least one of the first board layer, the second board layer and the frame contains glass fiber and resin.

[0009] Furthermore, the first plate layer, the support layer and the second plate layer are formed by a hot pressing process.

[0010] According to one aspect of the present invention, a battery pack case is provided, comprising: a frame; a liquid cooling plate arranged at the bottom of the frame; a bottom plate arranged at the bottom of the frame, the bottom plate being located on the outside of the liquid cooling plate, the bottom plate being the above-mentioned bottom plate, and the first plate layer of the bottom plate being arranged toward the liquid cooling plate.

[0011] Furthermore, a connecting boss is provided in an annular shape at the bottom of the frame. The connecting boss is located on the inner side of the frame, and the liquid cooling plate is fixedly connected to the connecting boss.

[0012] Furthermore, the liquid cooling plate has a liquid cooling channel inside, and the liquid cooling channel is partially protruding from the surface of the liquid cooling plate. The battery pack body also includes a buffer pad, which is arranged between the liquid cooling plate and the base plate. The side of the buffer pad facing the liquid cooling plate has an avoidance structure, and the avoidance structure is adapted to the shape of the liquid cooling channel.

[0013] Furthermore, the frame includes a front beam, side beams and a tail beam, the side beams are located between the front beam and the tail beam, the front beam includes a top beam, a bottom beam and a support plate, the top beam and the bottom beam are hollow structures, one end of the support plate is connected to the top beam, and the other end of the support plate is connected to the bottom beam, the connecting boss is arranged on the inner side of the bottom beam, the bottom beam is fixedly connected to the bottom plate, and the liquid cooling plate is located on the side of the connecting boss close to the bottom plate.

[0014] Furthermore, the battery pack box also includes a mounting beam, which is arranged on the outer side wall of the frame. The mounting beam has a connecting end and a free end that are relatively arranged. The connecting end is connected to the frame, and the longitudinal dimension of the mounting beam gradually decreases from the connecting end to the free end.

[0015] According to another aspect of the present invention, a battery pack is provided, comprising the above-mentioned battery pack case.

[0016] Applying the technical solution of the present invention, the base plate is composed of a first plate layer, a support layer and a second plate layer. The flame retardant performance of the first plate layer is lower than that of the second plate layer. The second plate layer is located on the outside of the battery pack body, so that the second plate layer can avoid the impact of external high-temperature fire or impact on the internal components. It can also avoid the large amount of heat generated during charging and discharging inside the battery pack to cause fire, reducing safety hazards and risks. The strength of the support layer is greater than the strength of the first plate layer and the strength of the second plate layer, so that the structural strength of the base plate can be guaranteed. Through the above-mentioned arrangement, while ensuring that the second plate layer achieves the preset flame retardant effect, the proportion of flame retardant material added in the first plate layer can be reduced. Compared with the prior art in which a flame retardant layer of the same thickness is added to both the inner and outer sides of the base plate, the solution of the present application can not only reduce the overall weight of the base plate and make the base plate lightweight, but also reduce the production cost of the base plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 An exploded view of the base plate provided by the present invention is shown;

[0019] Figure 2 A partial cross-sectional view of the battery pack box provided by the present invention is shown;

[0020] Figure 3 Shows a schematic structural diagram of the buffer pad provided by the utility model;

[0021] Figure 4 Shows a schematic structural diagram of the framework provided by the utility model;

[0022] Figure 5 Shows a top view of the frame provided by the utility model;

[0023] Figure 6 Shows a schematic structural diagram of the front beam provided by the utility model;

[0024] Figure 7 Shows a bottom view of the battery pack box provided by the present utility model;

[0025] Figure 8 Shows a schematic structural diagram of the battery pack box provided by the present utility model;

[0026] Figure 9 A partial side view of the battery pack box provided by the present invention is shown.

[0027] The above drawings include the following reference numerals:

[0028] 10. Bottom plate;

[0029] 11. First board layer;

[0030] 12. Support layer;

[0031] 121. Frame; 122. Metal plate;

[0032] 123. Support bar; 124. First accommodating area;

[0033] 13. Second board layer;

[0034] 20. Frame; 21. Connecting boss;

[0035] 221, front beam; 2211, top beam; 2212, bottom beam; 2213, support plate;

[0036] 222, side beam; 223, tail beam;

[0037] 23. Transverse beam; 24. Longitudinal beam; 25. Second accommodation area;

[0038] 30. Liquid cooling plate; 31. Liquid cooling channel;

[0039] 50. Buffer pad; 51. Avoidance structure;

[0040] 60. Mounting beam; 601. Second bottom plate; 602. Top plate;

[0041] 61. Connecting end; 62. Free end;

[0042] 70. Strengthening ribs;

[0043] 80. Upper cover;

[0044] 100. Battery pack box. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0046] like Figure 1 As shown, an embodiment of the present invention provides a bottom plate 10, which includes a first plate layer 11, a support layer 12 and a second plate layer 13. The first plate layer 11, the support layer 12 and the second plate layer 13 are sequentially arranged at the bottom of the battery pack case 100, the first plate layer 11 is arranged on the inner side of the battery pack case 100, and the second plate layer 13 is arranged on the outer side of the battery pack case 100. The bottom plate 10 can improve the structural strength of the battery pack case 100, and at the same time, the bottom plate 10 can protect the battery cells in the battery pack case 100 to prevent them from being damaged. The flame retardant performance of the first plate layer 11 is lower than the flame retardant performance of the second plate layer 13, and the strength of the support layer 12 is greater than the strength of the first plate layer 11 and the strength of the second plate layer 13. The flame retardant performance of the first plate layer 11 and the flame retardant performance of the second plate layer 13 are achieved by adding flame retardant materials to the composite layer to make the composite layer have flame retardant performance, and the flame retardant performance of the composite layer is adjusted by the proportion of the added flame retardant materials.

[0047] Using the technical solution of the present invention, the base plate 10 is composed of a first plate layer 11, a support layer 12, and a second plate layer 13. The flame retardancy of the first plate layer 11 is lower than that of the second plate layer 13. Positioning the second plate layer 13 on the outside of the battery pack casing 100 protects the second plate layer 13 from external high-temperature fires or impacts that could affect internal components. It also prevents fires caused by the excessive heat generated during battery charging and discharging, thereby reducing safety hazards and risks. The strength of the support layer 12 is greater than that of both the first plate layer 11 and the second plate layer 13, thereby ensuring the structural strength of the base plate 10. This arrangement ensures that the second plate layer 13 achieves the desired flame retardancy while reducing the proportion of flame retardant material added to the first plate layer 11 or eliminating the addition of flame retardant material to the first plate layer 11. Compared to the prior art method of adding flame retardant layers of equal thickness on both the inside and outside of the base plate, the solution of the present application not only further reduces the overall weight of the base plate 10, making it lightweight, but also reduces the production cost of the base plate 10.

[0048] In the present application, the first plate layer 11 and the second plate layer 13 are both composite materials. Compared to the metal base plates in the prior art, the composite materials can reduce the overall weight of the base plate 10, making the base plate 10 lightweight. The support layer 12 is made of a metal material, which can reduce the overall weight while ensuring structural strength. Preferably, the support layer 12 can be made of steel. Steel has high strength and good impact resistance, and is low in cost, which can save the production cost of the base plate 10. Through the above-mentioned arrangement, the support layer 12 cooperates with the first plate layer 11 and the second plate layer 13 to further reduce the weight of the base plate 10 while ensuring the structural strength and impact resistance of the base plate 10.

[0049] Specifically, the preset flame retardant effect of the second board layer 13 should reach the UL94V-0 flame retardant grade. In the present application, the type and proportion of the flame retardant material incorporated into the composite layer are not limited. The type of flame retardant material incorporated into the composite layer can be set to resin, expansion agent or acid source. Resin has good bonding strength, fire resistance and water resistance. When the expansion agent and acid source are exposed to high temperature, they can produce non-flammable gas, dilute the oxygen density, and form a protective layer. The proportion of the flame retardant material added is sufficient as long as the flame retardant performance of the second board layer 13 can meet the UL94V-0 flame retardant grade.

[0050] The thickness of the first plate layer 11 is between 0.3mm and 0.9mm, the thickness of the support layer 12 is between 0.4mm and 1.0mm, and the thickness of the second plate layer 13 is between 0.7mm and 1.3mm. If the thickness of the bottom plate 10 is too thick, the weight of the battery pack case will increase. If the thickness of the bottom plate 10 is too thin, the structural strength of the battery pack case will be reduced. Specifically, the thickness of the first plate layer 11 can be 0.6mm, the thickness of the support layer 12 can be 0.7mm, and the thickness of the second plate layer 13 can be 1mm.

[0051] Furthermore, the support layer 12 includes a frame 121 and a metal plate 122, and the frame 121 is arranged around the outer periphery of the metal plate 122. Through the above arrangement, the metal plate 122 can not only increase the rigidity and structural strength of the support layer 12, but also improve the protective performance of the bottom plate 10, which helps the battery pack to withstand external loads and impacts. At the same time, the metal plate 122 has good thermal conductivity, which can quickly disperse the heat inside the battery pack and improve the thermal management efficiency of the battery pack. The frame 121 can prevent the metal plate 122 from rusting after being exposed to the outside world and contacting the air. At the same time, the frame 121 can also serve as a transition connector connecting the metal plate 122 with the first plate layer 11 and the second plate layer 13, thereby avoiding poor connection caused by excessive distance between the outer periphery of the metal plate 122 and the first plate layer 11 and the second plate layer 13. In this application, the metal plate 122 is connected to the first plate layer 11 and the second plate layer 13 through the frame 121, which improves the stability of the connection between the metal plate 122 and the first plate layer 11 and the second plate layer 13, thereby improving the overall structural strength of the base plate 10.

[0052] In this embodiment, the connection method between the metal plate 122 and the frame 121 is not limited. In this embodiment, the metal plate 122 is not connected to the frame 121. The metal plate 122 is located within the area enclosed by the frame 121. The position of the metal plate 122 and the frame 121 can be fixed by hot pressing the first plate layer 11, the second plate layer 13, and the frame 121. In other embodiments of the present application, the metal plate 122 can also be fixed to the frame 121 by welding or fasteners to prevent relative displacement between the metal plate 122 and the frame 121.

[0053] The materials of the metal plate 122 and the frame 121 are not limited. The metal plate 122 can be made of aluminum, copper, nickel, or metal alloys, and the frame 121 can be made of a composite material. In this way, the frame 121, the first plate layer 11, and the second plate layer 13 are all composite materials. Through the above design, the connection between the frame 121 and the first plate layer 11 and the second plate layer 13 will have a higher bonding strength than using different materials, and the melting point and adhesive compatibility will be more compatible. This can improve the connection strength and effect between the layers of the base plate 10. At the same time, using the same material can reduce the complexity of the material composition, thereby reducing production costs.

[0054] like Figure 1 As shown, there are multiple metal plates 122, and support bars 123 are provided in the frame 121. The support bars 123 cooperate with the frame 121 to form multiple first accommodating areas 124. The first accommodating areas 124 are used to place the metal plates 122. The multiple first accommodating areas 124 are arranged in a one-to-one correspondence with the multiple metal plates 122. Compared with placing a single metal plate in the frame 121, the provision of multiple metal plates 122 in this application can reduce the material consumption of the metal plates 122, thereby saving the production cost of the base plate. Among them, there is no limitation on the number and setting direction of the metal plates 122, and they can be adjusted according to the assembly method of the battery module during actual use.

[0055] In this embodiment, at least one of the first board layer 11, the second board layer 13, and the frame 121 includes glass fiber and resin. Through this arrangement, the glass fiber material has high strength and the resin material has good toughness. Adding glass fiber and resin to the processing of the first board layer 11, the second board layer 13, or the frame 121 can make the above structure have high strength and good toughness. Furthermore, the resin material has adhesive properties, which can strengthen the connection strength between adjacent layers, thereby improving the overall performance of the base plate 10.

[0056] Specifically, in this embodiment, the materials of the first board layer 11, the second board layer 13 and the frame 121 all include glass fiber and resin. Such a configuration can ensure the overall structural strength of the base plate 10 while improving the stability of the connection between different layers.

[0057] In other embodiments of the present application, it is also possible to choose to add glass fiber and resin to the first board layer 11, or to add glass fiber and resin to the second board layer 13, that is, to add glass fiber and resin to any one of the first board layer 11, the second board layer 13 and the frame 121; or to add glass fiber and resin to the frame 121 and the second board layer 13, that is, to add glass fiber and resin to any two of the first board layer 11, the second board layer 13 and the frame 121.

[0058] In this embodiment, the first plate layer 11, the second plate layer 13 and the frame 121 are composed of polypropylene, glass fiber and resin. Polypropylene is a lightweight plastic with good chemical stability and electrical insulation, and is relatively low in cost compared to other engineering plastics. There is no limitation on the ratio of glass fiber to resin. In this embodiment, preferably, the ratio of glass fiber is 60%. If the ratio of glass fiber is too high and the ratio of resin is too low, the strength of the bottom plate 10 will be higher, but the toughness will be reduced, and the bottom plate 10 will be more easily damaged or broken. If the ratio of glass fiber is too low and the ratio of resin is too high, the strength of the bottom plate 10 will be lower, and it will be easily deformed and damaged when subjected to external impact, and it will be unable to support and protect the internal components of the battery pack.

[0059] Specifically, the first plate layer 11, the support layer 12, and the second plate layer 13 are formed by a hot pressing process. Through the above-mentioned setting, the hot pressing process can optimize the internal structure of the material, increase the bonding strength between the composite layers, make the composite layers tightly bonded, and thus improve the overall structural strength of the bottom plate 10.

[0060] like Figure 2 As shown, according to another embodiment of the present invention, a battery pack case 100 is provided, which includes: a frame 20, a liquid cooling plate 30 and a bottom plate 10. The frame 20 can ensure the overall mechanical strength of the battery pack case 100 so that the battery cells can be placed inside the frame 20. The liquid cooling plate 30 is arranged at the bottom of the frame 20. The liquid cooling plate 30 is used to cool the battery cells to prevent the internal temperature of the battery pack case 100 from being too high and to ensure the normal operation of the battery cells. The bottom plate 10 is arranged at the bottom of the frame 20. The bottom plate 10 is located on the outside of the liquid cooling plate 30. The bottom plate 10 is the bottom plate 10 in the above embodiment, and the first plate layer 11 of the bottom plate 10 is arranged towards the liquid cooling plate 30. Through the above arrangement, the bottom plate 10 can reduce the weight of the bottom plate 10 while ensuring the flame retardant performance, so that the battery pack case 100 is lightweight and the production cost of the battery pack case 100 can be saved.

[0061] Furthermore, a connecting boss 21 is provided in an annular shape at the bottom of the frame 20. The connecting boss 21 is located on the inner side of the frame 20, and the liquid cooling plate 30 is fixedly connected to the connecting boss 21. Through the above arrangement, the connecting boss 21 can provide a mounting position for the liquid cooling plate 30 and can guide and determine the mounting position of the liquid cooling plate 30, which helps to improve the assembly efficiency and assembly accuracy of the liquid cooling plate 30. At the same time, the connecting boss 21 can increase the contact area between the frame 20 and the liquid cooling plate 30, thereby making the connection between the liquid cooling plate 30 and the frame 20 more stable and improving the stability of the fixing of the liquid cooling plate 30.

[0062] In this embodiment, the liquid cooling plate 30 is connected to the connecting boss 21 by welding.

[0063] The space inside the frame 20 is limited, and the liquid cooling plate 30 is located below the connecting boss 21 to maximize the use of the internal space of the battery pack box 100. It is also more convenient and quick to maintain or replace the liquid cooling plate 30.

[0064] like Figure 2 and Figure 3 As shown, the liquid cooling plate 30 has a liquid cooling channel 31 inside, and the liquid cooling channel 31 is partially protruding from the surface of the liquid cooling plate 30. The battery pack case 100 also includes a buffer pad 50, which is arranged between the liquid cooling plate 30 and the base plate 10. In this way, the buffer pad 50 can absorb vibration and reduce the impact on the internal components of the battery pack case 100. When the battery pack case 100 is subjected to external impact or internal pressure changes, the buffer pad 50 can disperse stress and reduce the impact on the liquid cooling plate 30 and the base plate 10. At the same time, the buffer pad 50 can also fill the gap between the base plate 10 and the cold plate to ensure a tight connection between the base plate 10 and the liquid cooling plate 30. The battery pack case 100 improves the protection effect of the battery pack case 100 through the arrangement of the base plate 10, the liquid cooling plate 30 and the buffer pad 50.

[0065] Furthermore, the side of the buffer pad 50 facing the liquid cooling plate 30 has a relief structure 51 that matches the shape of the liquid cooling channel 31. This arrangement positions the liquid cooling channel 31 on the liquid cooling plate 30 within the relief structure on the buffer pad 50, increasing the contact area between the buffer pad 50 and the liquid cooling plate 30 and thereby improving heat transfer efficiency. This buffer layer also provides better support for the liquid cooling plate 30, reducing vibration caused by refrigerant flow. By matching the relief structure 51 with the raised structure of the liquid cooling channel 31, the buffer pad 50 can be positioned, improving the stability of the liquid cooling plate 30.

[0066] In this solution, the buffer pad 50 can be connected to the liquid cooling plate 30 and the base plate 10 by bonding. There is no limitation on the specific material of the buffer pad 50. A soft rubber foam layer such as PU foam, EPDM foam or silicone rubber foam can be selected. The above materials have good thermal insulation properties and elasticity.

[0067] like Figures 2 to 6As shown, the frame 20 includes a front beam 221, side beams 222 and a tail beam 223. The side beams 222 are located between the front beam 221 and the tail beam 223. The front beam 221 includes a top beam 2211, a bottom beam 2212 and a support plate 2213. The top beam 2211 and the bottom beam 2212 are hollow structures. The top beam 2211 is fixedly connected to the upper cover 80 of the battery pack case 100. Compared with the support by a vertical flat plate structure, the present application can reduce the weight of the front beam 221 through the above arrangement, and at the same time increase the connection area between the top beam 2211 and the upper cover 80 of the battery pack case 100, and the structural strength of the connection between the bottom beam 2212 and the bottom plate 10 and the liquid cooling plate 30 of the battery pack case 100, thereby preventing the battery pack case 100 from being deformed at the connection between the top beam 2211 and the bottom beam 2212 when it is subjected to external impact, thereby improving the sealing effect of the battery pack case 100.

[0068] The connecting boss 21 is located inside the bottom beam 2212, which is fixedly connected to the bottom plate 10. The liquid cooling plate 30 is located on the side of the connecting boss 21 that is closest to the bottom plate 10. This structure is simple and prevents the liquid cooling plate 30 from interfering with components placed on the connecting boss 21.

[0069] In this embodiment, the connection method between the bottom beam 2212 and the bottom plate 10 is not limited and can be connected by fasteners, welding, or bonding. Specifically, in this embodiment, the bottom plate 10 is fixed to the frame 20 using rivet nuts. This not only improves the overall structural stability of the battery pack case 100, but also improves the convenience of disassembly and assembly of the bottom beam 2212 and the bottom plate 10.

[0070] like Figure 4 and Figure 5 As shown, the frame 20 includes a panel, a crossbeam 23 and a longitudinal beam 24. The crossbeam 23 and the longitudinal beam 24 are located inside the panel. The panel, the crossbeam 23 and the longitudinal beam 24 cooperate with each other to form a plurality of second accommodating areas 25. The second accommodating areas 25 are used to place battery modules. The battery modules are integrated by a plurality of battery cells. The front beam 221, the side beam 222 and the tail beam 223 form the panel. Through the above arrangement, the crossbeam 23 can resist the expansion force of the battery module and reduce the possibility of the expansion force of the battery module after damage causing squeezing of the adjacent battery modules. The end of the battery module no longer needs to be provided with an end plate to ensure the structural stability of the battery module. The battery module can be directly assembled into the battery pack, realizing a module-free design. In this way, the space utilization rate of the battery pack box 100 is improved, more battery modules can be installed in the same volume, and the energy density of the battery pack is improved. The assembly process is simplified and the production cost is reduced.

[0071] In the present application, the height of the crossbeam 23 and the longitudinal beam 24 needs to be higher than 80% of the height of the battery module, and at the same time, the height of the crossbeam 23 and the longitudinal beam 24 needs to be less than 100% of the height of the battery module, that is, the height of the crossbeam 23 and the longitudinal beam 24 is between 80% and 100% of the height of the battery module. If the height of the crossbeam 23 and the longitudinal beam 24 is lower than 80%, the height of the crossbeam 23 and the longitudinal beam 24 is too low, which will result in a lower structural strength of the crossbeam 23 and the longitudinal beam 24, thereby reducing the overall structural strength of the frame 20 of the battery pack case 100. If the height of the crossbeam 23 and the longitudinal beam 24 is higher than 100%, then the height of the crossbeam 23 and the longitudinal beam 24 is too high, which will increase the spatial height of the battery pack case 100, thereby increasing the volume of the entire battery pack.

[0072] Specifically, the cross beam 23 and the longitudinal beam 24 are both made of metal, and are connected by welding, so that the connection strength is high and the structural stability is better.

[0073] One end of the support plate 2213 is connected to the top beam 2211, and the other end of the support plate 2213 is connected to the bottom beam 2212. This arrangement, in which the top beam 2211 and the bottom beam 2212 are connected via the support plate 2213, can further reduce the weight of the front beam 221, thereby reducing the overall weight of the battery pack case 100 and achieving a lightweight battery pack.

[0074] In this application, there is no limit on the number of crossbeams 23 and longitudinal beams 24. In this application, three crossbeams 23 and two longitudinal beams 24 are provided, with the crossbeam 23 near the tail beam 223 being integrated with the tail beam 223. This improves the strength of the crossbeam 23 relative to the tail beam 223 while reducing the space occupied by the crossbeam 23, making the battery pack case 100 more compact and miniaturized.

[0075] like Figure 7 and Figure 8 As shown, the battery pack case 100 also includes a mounting beam 60, which is arranged on the outer side wall of the frame 20. The mounting beam 60 has a connecting end 61 and a free end 62 that are relatively arranged. The connecting end 61 is connected to the frame 20, and the longitudinal dimension of the mounting beam 60 gradually decreases from the connecting end 61 to the free end 62. The free end 62 of the mounting beam 60 fixes the battery pack case 100 in the vehicle through fasteners. The above arrangement is conducive to dispersing the force at the mounting point to the entire frame 20, avoiding stress concentration and fracture at the mounting point, extending the service life of the mounting beam 60 and the stability of the fixed position of the battery pack case 100.

[0076] like Figure 9As shown, the mounting beam 60 comprises a second bottom plate 601 and a top plate 602. The distance between the second bottom plate 601 and the top plate 602 gradually decreases toward the free end 62. One end of the second bottom plate 601 and one end of the top plate 602 are connected to the outer wall of the frame 20 to form a connecting end 61, while the other end of the second bottom plate 601 and the other end of the top plate 602 are connected to form a free end 62. Multiple reinforcing ribs 70 are located between the second bottom plate 601 and the top plate 602. With this arrangement, the ribs 70 can distribute the concentrated load at the free end 62 over a larger area, further reducing local stress concentration. Furthermore, the ribs 70 can enhance the structural strength of the mounting beam 60 and reduce deformation when subjected to external forces. Furthermore, the provision of multiple reinforcing ribs 70 can optimize the force transmission path and rate. The ribs 70 can guide force along a specific path, avoiding direct impact and concentration of external forces, and reducing the risk of damage to the mounting beam 60 and the battery pack casing 100.

[0077] According to another aspect of the present invention, a battery pack is provided, comprising the battery pack case 100 described above. The above configuration provides a battery pack case 100 having excellent flame retardancy, superior structural strength, high integration, high space utilization, and low production cost, thereby improving the overall performance of the battery pack, including energy density and service life.

[0078] The battery pack provided in this application has the following advantages:

[0079] 1. The bottom plate adopts a multi-layer composite structure. The flame retardant performance of the outer composite layer of the battery pack is higher than that of the inner composite layer, and the production cost of the bottom plate is low;

[0080] 2. The tail beam and cross beam are designed as one piece, and the top and bottom beams of the front beam are hollow structures, which has high structural strength;

[0081] 3. The battery pack box integrates liquid cooling plate, bottom plate and buffer layer, with high integration and good protection effect;

[0082] 4. The mounting beam is designed to be smaller at a distance and larger near the target. The reinforcement ribs increase the strength of the mounting beam and optimize the force transmission path.

[0083] 5. The battery pack box is a combination of a frame and horizontal and vertical beams to achieve a module-free design.

[0084] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0085] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0086] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0087] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0088] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0089] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A base plate, characterized in that: The bottom plate comprises a first plate layer (11), a support layer (12) and a second plate layer (13) arranged in sequence, wherein the first plate layer (11) is located on the inner side of the battery pack case, and the second plate layer (13) is located on the outer side of the battery pack case, the flame retardant performance of the first plate layer (11) is lower than the flame retardant performance of the second plate layer (13), and the strength of the support layer (12) is greater than the strength of the first plate layer (11) and the strength of the second plate layer (13).

2. The base plate according to claim 1, wherein: The supporting layer (12) comprises a frame (121) and a metal plate (122), wherein the frame (121) is arranged around the outer periphery of the metal plate (122).

3. The base plate according to claim 2, wherein: There are multiple metal plates (122), and a support bar (123) is provided in the frame (121). The support bar (123) cooperates with the frame (121) to form multiple first accommodating areas (124). The first accommodating areas (124) are used to place the metal plates (122), and the multiple first accommodating areas (124) are arranged in a one-to-one correspondence with the multiple metal plates (122).

4. The base plate according to claim 2, wherein: At least one of the first board layer (11), the second board layer (13) and the frame (121) contains glass fiber and resin.

5. The base plate according to claim 1, wherein: The first plate layer (11), the support layer (12) and the second plate layer (13) are formed by a hot pressing process.

6. A battery pack box, characterized in that: The battery pack box includes: Frame (20); a liquid cooling plate (30) disposed at the bottom of the frame (20); A base plate (10) is arranged at the bottom of the frame (20), the base plate (10) is located on the outside of the liquid cooling plate (30), the base plate is the base plate according to any one of claims 1 to 5, and the first plate layer (11) of the base plate (10) is arranged toward the liquid cooling plate (30).

7. The battery pack case according to claim 6, characterized in that: A connecting boss (21) is provided in an annular shape at the bottom of the frame (20), the connecting boss (21) is located on the inner side of the frame (20), and the liquid cooling plate (30) is fixedly connected to the connecting boss (21).

8. The battery pack case according to claim 6, characterized in that: The liquid cooling plate (30) has a liquid cooling channel (31) inside, and the liquid cooling channel (31) is partially protruding from the surface of the liquid cooling plate (30). The battery pack box further includes a buffer pad (50), and the buffer pad (50) is arranged between the liquid cooling plate (30) and the bottom plate (10). The side of the buffer pad (50) facing the liquid cooling plate (30) has an avoidance structure, and the avoidance structure is adapted to the shape of the liquid cooling channel (31).

9. The battery pack case according to claim 7, characterized in that: The frame (20) includes a front beam (221), a side beam (222) and a tail beam (223), wherein the side beam (222) is located between the front beam (221) and the tail beam (223), and the front beam (221) includes a top beam (2211), a bottom beam (2212) and a support plate (2213), wherein the top beam (2211) and the bottom beam (2212) are hollow structures, one end of the support plate (2213) is connected to the top beam (2211), and the other end of the support plate (2213) is connected to the bottom beam (2212), the connecting boss (21) is arranged on the inner side of the bottom beam (2212), and the bottom beam (2212) is fixedly connected to the bottom plate (10), and the liquid cooling plate (30) is located on a side of the connecting boss (21) close to the bottom plate (10).

10. The battery pack case according to claim 6, characterized in that: The battery pack box further includes a mounting beam (60), which is arranged on the outer side wall of the frame (20). The mounting beam (60) has a connecting end (61) and a free end (62) that are arranged opposite to each other. The connecting end is connected to the frame (20), and the longitudinal dimension of the mounting beam (60) gradually decreases from the connecting end (61) to the free end (62).

11. A battery pack, characterized in that: The battery pack includes the battery pack case according to any one of claims 6 to 10.

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