Battery pack lower shell, battery pack and vehicle

Abstract

The utility model provides a battery pack lower shell, a battery pack and a vehicle, and belongs to the technical field of battery manufacturing, the battery pack lower shell comprises a lower shell body, at least one group of mounting structures and an energy absorption structure, the mounting structures are arranged at the end part of the lower shell body along the Y-axis direction, and the energy absorption structure is arranged at the end part of the lower shell body along the Y-axis direction. A containing groove with a downward opening is formed between the mounting structure and the outer side wall of the lower shell body. The energy absorption structure is located in the containing groove and connected with the lower shell body, and the energy absorption structure is a deformable structure. According to the battery pack lower shell provided by the utility model, the mounting structure is arranged at the end part in the Y-axis direction and forms the accommodating groove structure, a dual-protection mechanism is formed by matching with the deformable energy absorption structure, the rigidity of a foundation structure is guaranteed by utilizing the mounting structure, collision kinetic energy can be effectively buffered by utilizing the controllable deformation characteristic of the energy absorption structure, and the safety of the battery pack is improved. The problem of shell cracking caused by insufficient energy absorption of an existing battery pack lower shell is solved, and the strength and the reliability of the battery pack lower shell are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery manufacturing technical field, more specifically, relate to a battery package lower casing, battery package and vehicle. BACKGROUND

[0002] At present, new energy vehicles have become the new energy industry that various countries support. The power battery package is the core component of the new energy vehicle, and provides power for the whole vehicle. The battery package lower casing is an important part in the power battery package, which provides strength, stiffness and sealing performance for the whole power battery package, and can protect the battery well.

[0003] The battery package lower casing on the market includes two schemes. One is an aluminum profile splicing and welding scheme, but this scheme generally has the problem of strength attenuation in the welding area. If the welding cracks, it will affect the sealing performance of the battery. The second is an integrated die-cast aluminum scheme, but this scheme has the risk of cracking of the casing due to insufficient energy absorption of the lower casing itself under the whole vehicle safety collision working condition because the elongation after fracture of the cast aluminum alloy is low. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a battery package lower casing, a battery package and a vehicle, and aims to solve the problem of cracking of the casing due to insufficient energy absorption of the battery package lower casing itself.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of providing a battery package lower casing, which comprises a lower casing body, a mounting structure and an energy absorption structure. The mounting structure is provided in at least one group. The mounting structure is arranged at the end of the lower casing body along the Y-axis direction. The mounting structure and the outer side wall of the lower casing body have an accommodating groove with an opening downward. The energy absorption structure is embedded in the accommodating groove and detachably connected with the lower casing body. The energy absorption structure is a deformable structure.

[0006] The battery package lower casing provided by the utility model has the beneficial effects that compared with the prior art, the battery package lower casing of the utility model sets the mounting structure at the Y-axis end and forms the accommodating groove structure, cooperates with the deformable energy absorption structure to form a double protection mechanism, constructs a composite impact resistance system in Y and Z directions, uses the mounting structure to ensure the rigidity of the basic structure, and uses the controllable deformation characteristics of the energy absorption structure to effectively buffer the collision kinetic energy, realizes the protection effect of rigidity and flexibility, solves the problem of cracking of the casing due to insufficient energy absorption of the existing battery package lower casing, and improves the strength and reliability of the battery package lower casing.

[0007] As another embodiment of the present application, the outer periphery of the open end of the lower shell body has a horizontally extending flange structure, the mounting structure is connected to the outer side edge of the flange structure, and the lower end of the mounting structure is located below the flange structure, and the lower shell body, the flange structure and the mounting structure surround the accommodation groove.

[0008] The beneficial effects of the present embodiment are that the local thickening region formed by horizontal outward extension significantly improves the connection strength of the lower shell body and the mounting structure, disperses the shear stress generated during impact, avoids stress concentration effect, and improves the bending stiffness of the connection region; the accommodation groove serves as a mechanical buffer space, and the initial impact energy is absorbed through elastic deformation of the region during impact, and the remaining load is uniformly transmitted to the lower shell body along the Y-axis direction through the rigid support of the flange structure, avoiding local overload.

[0009] As another embodiment of the present application, the width of the accommodation groove gradually decreases from the groove opening towards the groove bottom.

[0010] The beneficial effects of the present embodiment are that the width of the accommodation groove gradually decreases along the depth direction, so that the energy absorption structure generates a material deformation resistance that is regulated by the cross-sectional area gradient change during impact, thereby improving the energy absorption density.

[0011] As another embodiment of the present application, the energy absorption structure has a first mounting surface and a second mounting surface, the first mounting surface is attached to the groove bottom of the accommodation groove, the second mounting surface is attached to the outer side wall of the lower shell body, and mounting holes are formed in the first mounting surface and the second mounting surface.

[0012] The beneficial effects of the present embodiment are that the energy absorption structure is fixed by riveting or screwing through the mounting holes of the first mounting surface and the second mounting surface, achieving the purpose of being detachable, facilitating installation, and improving the feasibility of the assembly process.

[0013] As another embodiment of the present application, the energy absorption structure is a frame structure, the energy absorption structure has an energy absorption cavity inside, and the lower end of the energy absorption structure is provided with a drainage hole that communicates with the energy absorption cavity.

[0014] The beneficial effects of the present embodiment are that when the frame of the energy absorption structure is subjected to external pressure or fluctuation, it deforms or even elongates by being extruded by virtue of its deformable characteristics and the internal energy absorption cavity, thereby offsetting the external energy and avoiding the fluctuation of the battery cells inside the lower shell body, and the drainage hole avoids water accumulation in the energy absorption cavity.

[0015] As another embodiment of the present application, the energy absorption cavity has two, and the two energy absorption cavities are longitudinally spaced apart; the energy absorption structure includes a middle partition plate located between the two energy absorption cavities, and the middle partition plate and the bottom plate of the energy absorption structure are both provided with the drainage hole.

[0016] The beneficial effect of the embodiment is that the bottom plate of the energy absorption structure is provided with a drainage hole for draining water in the lower energy absorption cavity downward, avoiding water accumulation in the energy absorption cavity.

[0017] As another embodiment of the application, the cell mounting groove of the lower shell body is provided with an inner reinforcing rib.

[0018] The beneficial effect of the embodiment is that the inner reinforcing rib can be used to disperse concentrated stress and transmit force laterally, protecting the cell from force.

[0019] As another embodiment of the application, the mounting structure is provided with a mounting hole in the Z-axis direction and an outer reinforcing rib located in the circumferential direction of the mounting hole.

[0020] The beneficial effect of the embodiment is that the reinforcing rib arranged on the mounting part can be used to disperse concentrated stress, improve the rigidity of the mounting part, and optimize the overall strength of the mounting structure, which, in cooperation with the energy absorption structure, achieves the protection effect of rigidity and flexibility.

[0021] A battery pack is also provided, comprising the above-mentioned battery pack lower shell, and further comprising a cell mounted in the cell mounting groove of the lower shell body.

[0022] The beneficial effect of the battery pack provided by the utility model lies in that, compared with the prior art, the battery pack of the utility model adopts a battery pack lower shell, has all the beneficial effects of the above-mentioned battery pack lower shell, and through arranging the mounting structure at the Y-axis end and forming a containing groove structure, a double protection mechanism is formed in cooperation with the deformable energy absorption structure, solving the problem of shell cracking caused by insufficient energy absorption of the battery pack lower shell; and the strength and reliability of the battery pack lower shell are improved.

[0023] A vehicle is also provided, comprising the above-mentioned battery pack lower shell.

[0024] The beneficial effect of the vehicle provided by the utility model lies in that, compared with the prior art, the vehicle of the utility model adopts a battery pack lower shell, has all the beneficial effects of the above-mentioned battery pack lower shell, and through arranging the mounting structure at the Y-axis end and forming a containing groove structure, a double protection mechanism is formed in cooperation with the deformable energy absorption structure, solving the problem of shell cracking caused by insufficient energy absorption of the battery pack lower shell in the vehicle, improving the strength and reliability of the battery pack lower shell, and improving the stability of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0026] Figure 1 A structure diagram of the lower shell body of the battery pack provided by the embodiment of the present application is shown in the figure.

[0027] Figure 2 A top view of the lower shell body of the battery pack provided by the embodiment of the present application is shown in the figure.

[0028] Figure 3 A side view of the lower shell body of the battery pack provided by the embodiment of the present application is shown in the figure.

[0029] Figure 4 An exploded view of the lower shell body of the battery pack provided by the embodiment of the present application is shown in the figure.

[0030] Figure 5 A structure diagram of the lower shell body of the battery pack provided by the embodiment of the present application is shown in the figure.

[0031] Figure 6 A structure diagram of the energy absorption structure provided by the embodiment of the present application is shown in the figure. Figure 5 An enlarged view of position A in the figure.

[0032] Figure 7 A structure diagram of the energy absorption structure provided by the embodiment of the present application is shown in the figure.

[0033] Figure 8 A connection diagram of the energy absorption structure and the lower shell body provided by the embodiment of the present application is shown in the figure.

[0034] Figure 9 A structure diagram of the energy absorption structure provided by the embodiment of the present application is shown in the figure. Figure 8 An enlarged view of position B in the figure.

[0035] Figure 10 A partial sectional view of the lower shell body of the battery pack provided by the embodiment of the present application is shown in the figure.

[0036] In the figure: 1, lower shell body; 2, mounting part; 3, mounting ring; 4, outer reinforcing rib; 5, energy absorption structure; 6, inner longitudinal reinforcing rib; 7, inner transverse reinforcing rib; 8, first mounting surface; 9, second mounting surface; 10, energy absorption cavity; 11, drainage hole; 12, clearance hole; 13, folded edge structure; 14, mounting bolt; 15, accommodating groove. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical schemes and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples.

[0038] Please refer to Figures 1 to 10 The battery pack lower shell, the battery pack and the vehicle provided by the utility model will be described. The battery pack lower shell comprises a lower shell body 1, a mounting structure and an energy absorption structure 5, the mounting structure is provided in at least one group, the mounting structure is arranged at the end of the lower shell body 1 along the Y-axis direction, and the mounting structure and the outer side wall of the lower shell body 1 have an opening downward containing groove 15; the energy absorption structure 5 is embedded in the containing groove 15 and is detachably connected with the lower shell body 1, and the energy absorption structure 5 is a deformable structure.

[0039] The lower shell body 1 and the mounting structure form the main bearing structure of the battery pack lower shell, the energy absorption structure 5 is installed in the containing groove 15 between the lower shell body 1 and the mounting structure, and the deformable feature of the energy absorption structure 5 is utilized to achieve the energy absorption effect. The energy absorption structure 5 is detachably connected, the overall structure does not need to be replaced after a collision, only the damaged module needs to be independently disassembled and maintained, the maintenance efficiency is improved by 70%, and the vehicle downtime is greatly shortened; the detachable energy absorption structure 5 can adopt different materials from the lower shell body 1, such as aluminum alloy or composite material, so that the lightweight and energy absorption performance can be configured as needed, and the demand of multiple collision conditions can be met; the independent disassembly and replacement of the energy absorption structure 5 can prolong the service life of the shell body, and the energy absorption structure 5 can be 100% recycled, which meets the requirements of circular economy.

[0040] Compared with the prior art, the battery pack lower shell provided by the utility model is characterized in that the mounting structure is arranged at the Y-axis end and forms a containing groove 15 structure, and a double protection mechanism is formed by cooperating with the deformable energy absorption structure, a composite impact resistance system in the Y direction and the Z direction is constructed, the basic structure rigidity is ensured by utilizing the mounting structure, the controllable deformation characteristics of the energy absorption structure 5 can effectively buffer the collision kinetic energy, and the protection effect of rigid and flexible combination is realized; the problem that the existing battery pack lower shell energy absorption is insufficient and causes the shell to crack is solved, and the strength and reliability of the battery pack lower shell are improved; the detachable connection of the energy absorption structure 5 and the lower shell facilitates the replacement of the energy absorption structure and the combination of different materials, improves the energy absorption effect, and reduces the cost.

[0041] In addition, the opening downward containing groove 15 structure realizes the collaborative design of the protection function and the space utilization, ensures the volume of the energy absorption cavity 10, and avoids occupying the battery module layout space.

[0042] The length direction of the lower shell body 1 is the Y-axis direction, the width direction of the lower shell body 1 is the X-axis direction, and the thickness direction of the lower shell body 1 is the Z-axis direction.

[0043] The mounting structure can be one or two groups. When the mounting structure is one group, the corresponding energy-absorbing structure 5 is one; the mounting structure is installed at either end of the length direction of the lower shell body 1 and cooperates with the outer side wall of the lower shell body 1 to form a containing groove 15, and the energy-absorbing structure 5 is installed in the containing groove 15. When the mounting structure is two groups, the corresponding energy-absorbing structure 5 is two, the mounting structure is installed at both ends of the length direction of the lower shell body 1, and cooperates with the outer side wall of the lower shell body 1 to form containing grooves 15 respectively, and the two containing grooves 15 are located at both ends of the lower shell body 1 respectively, and the energy-absorbing structures 5 are installed in the two containing grooves 15.

[0044] In some possible embodiments, referring to Figure 2 , Figure 5 , Figure 6 and Figure 10 , the outer side of the lower shell body 1 has a horizontally extending flange structure 13, the upper end of the mounting structure is connected to the outer side edge of the flange structure 13, and the lower end of the mounting structure is located below the flange structure 13, and the lower shell body 1, the flange structure 13 and the mounting structure surround the containing groove 15.

[0045] The flange structure 13 adopts a flange turning edge, the flange structure 13 extends outward in the horizontal direction, and the mounting structure is connected at the outer side edge thereof. At this time, a gap is formed between the side wall of the mounting structure and the outer side wall of the lower shell body 1, which cooperates with the horizontally arranged flange structure 13 to form the inner cavity of the containing groove 15. The two sides of the width direction of the containing groove 15 are the mounting structure and the lower shell body 1 respectively.

[0046] The flange structure 13 adopts a flange turning edge design, and forms a local thickening area by extending outward horizontally, which significantly improves the connection strength of the lower shell body 1 and the mounting structure. The flange turning edge can disperse the shear stress generated during the collision, avoid stress concentration effect, improve the bending stiffness of the connection area, and at the same time form a continuous support interface in the Z-axis direction, thereby enhancing the overall torsional performance. The gap between the side wall of the mounting structure and the flange structure 13 forms the containing groove 15, which serves as a mechanical buffer space, absorbs the initial impact energy through elastic deformation of the area during the collision, and then uniformly transmits the remaining load along the Y-axis direction to the lower shell body 1 through the rigid support of the flange structure 13, thereby avoiding local overload.

[0047] Specifically, the shell body 1 and the mounting structure can be made of one-piece die-cast aluminum. During die-casting, the mounting structure, the flange structure 13 and the shell body 1 are integrally die-cast at one time, and the containing groove is naturally formed between the mounting structure and the shell body 1. Figure 1 and Figure 2As shown, the lower shell body 1 forms a central recess, a groove structure extending upward around the periphery, and the central recess of the lower shell body 1 is an electric core mounting groove. The upper end of the peripheral sidewall of the lower shell body 1 is pressed to form a horizontally extending flange structure 13, and one or more sides of the flange structure 13 is further connected with a hanging structure. The flange structure 13 and the hanging structure are formed in the process of die casting, without the need for additional welding, thereby ensuring the integrity of the lower shell of the battery pack.

[0048] As shown in Figure 9 , the width of the accommodation groove 15 gradually decreases from the groove opening to the groove bottom, that is, the width of the accommodation groove 15 gradually decreases along the depth direction of the accommodation groove 15. The width of the groove opening part of the accommodation groove 15 is greater than the width of the groove bottom part, so that the inner cavity of the accommodation groove 15 gradually increases from bottom to top. This design is more convenient for the energy-absorbing structure 5 to enter the inner cavity of the accommodation groove 15 from the groove opening, and improves the bending stiffness at the flange structure. In addition, the energy-absorbing structure 5 cooperates with the accommodation groove 15 to form a structure with a narrow upper part and a wide lower part, achieving the purpose of the lower energy-absorbing effect being greater than the upper energy-absorbing effect, and cooperating with the hanging structure to form a rigid and flexible energy-absorbing protection structure.

[0049] In addition, the width of the accommodation groove 15 gradually decreases along the depth direction, so that the energy-absorbing structure 5 produces a progressive collapse deformation from the groove opening to the groove bottom when colliding, and the energy-absorbing density is improved by using the gradient change of the cross-sectional area to control the material deformation resistance. When a collision occurs in the Y-axis direction, the width change of the energy-absorbing structure 5 can produce a lateral support component, which can inhibit the lateral instability of the energy-absorbing structure 5 during compression.

[0050] As shown in Figure 4 , the energy-absorbing structure 5 is made of aluminum profile splicing. The energy-absorbing structure 5 is detachably fixed to the lower shell body 1 by riveting or screwing. When the lower shell body 1 is subjected to a collision, the energy-absorbing structure 5 can absorb the energy of the lower shell body 1 through its own deformation, thereby protecting the electric core in the electric core mounting cavity of the lower shell body 1 from force. When the width of the energy-absorbing structure 5 gradually increases along the height direction in cooperation with the accommodation groove 15, the flexibility of the energy-absorbing structure 5 will increase with the increase of the width, that is, the closer to the groove bottom of the mounting groove, the stronger the rigidity of the energy-absorbing structure 5, and the closer to the groove opening of the mounting groove, the more flexible the energy-absorbing structure 5.

[0051] In some possible embodiments, please refer to Figure 4 , Figure 7 and Figure 10 , the energy-absorbing structure 5 has a first mounting surface 8 and a second mounting surface 9, the first mounting surface 8 is connected to the groove bottom of the accommodation groove 15, and the second mounting surface 9 is connected to the outer sidewall of the lower shell body 1.

[0052] The upper end of the energy-absorbing structure 5 has a first mounting surface 8, and the side of the energy-absorbing structure 5 has a second mounting surface 9. After the energy-absorbing structure 5 is inserted into the accommodating groove 15, the first mounting surface 8 is attached to the groove bottom of the accommodating groove 15, that is, the first mounting surface 8 is attached to the lower end surface of the folding edge structure 13 between the lower shell body 1 and the mounting structure. The second mounting surface 9 is attached to the outer side wall of the shell body.

[0053] The first mounting surface 8 is provided with a plurality of first mounting holes spaced apart along the length direction thereof, and corresponding pull-rivet positioning holes are formed in the folding edge structure 13. During installation, the first mounting surface 8 is fixed to the lower end of the folding edge structure 13 by pull-rivet bolts penetrating through the first mounting holes and the pull-rivet positioning holes.

[0054] The second mounting surface 9 is provided with a plurality of second mounting holes spaced apart along the length direction thereof, and corresponding bolt holes are formed in the side of the lower shell body 1. The second mounting surface 9 is fixed to the outer side wall of the lower shell body 1 by installation bolts 14 penetrating through the second mounting holes and the bolt holes.

[0055] After the first mounting surface 8 and the second mounting surface 9 are both fixed, the energy-absorbing structure 5 is installed. The energy-absorbing structure 5 is fixed by riveting or screwing through the mounting holes of the first mounting surface 8 and the second mounting surface 9, achieving the purpose of being detachable, facilitating installation, and improving the feasibility of the assembly process.

[0056] During installation, first, the lower shell body 1 is inverted, so that the accommodating groove 15 is in a state with the groove opening upward; then the first mounting surface 8 of the energy-absorbing structure 5 is downward, and the energy-absorbing structure 5 is placed into the inner cavity of the accommodating groove 15 from the groove opening of the accommodating groove 15; then the first mounting surface 8 and the second mounting surface 9 are fixed in sequence until the energy-absorbing structure 5 is installed. When fixing the first mounting surface 8 and the second mounting surface 9, the second mounting surface 9 can be fixed first. The second mounting surface 9 of the energy-absorbing structure 5 is attached to the outer side wall of the lower shell body 1 by penetrating the second mounting holes of the energy-absorbing structure 5 with the installation bolts 14, and is fixed by the installation bolts 14. Then the lower shell of the battery pack is inverted, so that the accommodating groove 15 is in a state with the groove opening downward, and the pull-rivet bolts are installed to fix the first mounting surface 8 of the energy-absorbing structure 5 to the folding edge structure 13 by the pull-rivet bolts.

[0057] The first mounting surface 8 is a horizontal surface and the second mounting surface 9 is a longitudinal surface, and there is an included angle between the two. When the energy-absorbing structure 5 is subjected to a collision, the first mounting surface 8 and the second mounting surface 9 respectively decompose the force and transmit it to the lower shell body 1 and the folding edge structure 13, reducing the impact effect.

[0058] In some possible embodiments, as shown in Figure 7 and Figure 10 the energy-absorbing structure 5 is a frame structure, the inside of the energy-absorbing structure 5 has an energy-absorbing cavity 10, and the lower end of the energy-absorbing structure 5 is provided with a drainage hole 11 communicating with the energy-absorbing cavity 10.

[0059] The energy absorption structure 5 is made by a process of welding aluminum profiles, and includes a frame structure on the outer side and an energy absorption cavity 10 in the interior, which is a hollow cavity structure. When the frame of the energy absorption structure 5 is pressed or fluctuated by external force, it deforms or is even stretched by the deformable characteristics and the energy absorption cavity 10 in the interior, so as to offset the energy on the outer side and avoid the battery cells in the lower shell body 1 from being fluctuated.

[0060] In order to adapt to the shape of the accommodating groove 15 and ensure the strength of the energy absorption structure 5, the energy absorption structure 5 has an upper half and a lower half, the upper half is a rectangular frame, and the lower half is a trapezoidal or rectangular frame. The energy absorption cavity 10 is arranged in the frame of the upper half and the lower half.

[0061] The frames of the upper half and the lower half can be connected by welding or the like. In order to facilitate drainage, a drainage hole 11 is arranged on the frame to drain the water in the energy absorption cavity 10 and prevent the energy absorption cavity 10 from rusting due to water accumulation.

[0062] In some possible embodiments, as shown in Figure 7 and Figure 10 The energy absorption cavity 10 has two energy absorption cavities 10 arranged longitudinally, and the energy absorption structure 5 includes a middle partition plate between the two energy absorption cavities 10, and the middle partition plate and the bottom plate of the energy absorption structure 5 are both provided with drainage holes 11.

[0063] The frames of the upper half and the lower half can be connected by the middle partition plate, and the upper and lower sides of the middle partition plate are both the energy absorption cavities 10. The drainage hole 11 arranged on the middle partition plate is used to communicate the energy absorption cavities 10 in the frame of the upper half, and drain the water in the upper energy absorption cavity 10 downward into the lower energy absorption cavity 10. The drainage hole 11 arranged on the bottom plate of the energy absorption structure 5 is used to drain the water in the lower energy absorption cavity 10 downward, so as to avoid water accumulation in the energy absorption cavity 10.

[0064] Optionally, the energy absorption cavity 10 is a hollow cavity extending along the X-axis direction, and a plurality of reinforcing rib plates are arranged in the energy absorption cavity 10 and spaced apart in the width direction. The reinforcing rib plates are longitudinally arranged along the length direction of the energy absorption cavity 10. The reinforcing rib plates divide the energy absorption cavity 10 into several separate cavities in the width direction, which increases the strength of the energy absorption cavity 10 without affecting the energy absorption effect. The upper end of the reinforcing rib plate extends to the upper end of the energy absorption cavity 10, and the lower end of the reinforcing rib plate extends to the lower end of the energy absorption cavity 10. The reinforcing rib plate is fixedly connected with the energy absorption structure 5.

[0065] The two ends of the length direction of the energy absorption structure 5 are not provided with end plates, and the two ends of the length direction of the energy absorption cavity 10 are communicated with the outside to form an open end, so that the energy absorption effect of the energy absorption cavity 10 at each position in the length direction is consistent. In some possible embodiments, the second mounting surface 9 is located on the outer side of the energy absorption cavity 10, and a clearance hole 12 is formed on the side plate away from the second mounting surface 9 of the energy absorption structure 5. The clearance hole 12 is coaxially arranged with the mounting hole on the second mounting surface 9.

[0066] The second mounting surface 9 and the lower shell body 1 are connected by bolts. In order to facilitate the connection of the bolts, clearance holes 12 are formed on the symmetrically opposite side plates of the second mounting surface 9. The clearance holes 12 correspond to the second mounting holes on the second mounting surface 9 one by one, and the inner diameter of the clearance holes 12 is larger than that of the mounting holes. The clearance holes 12 are used as bolt through holes for the bolts to pass through, which facilitates the bolt mounting and improves the installation convenience of the energy absorption structure 5 and the feasibility of the assembly process.

[0067] In some possible embodiments, as shown in Figure 4 , Figure 5 and Figure 8 , the mounting structure located on the same side of the lower shell body 1 has a plurality of mounting parts 2, and the plurality of mounting parts 2 are arranged at intervals along the X-axis direction. The clearance hole 12 is located in the gap between the adjacent two mounting parts 2.

[0068] The mounting structure located on the same side is a group, and the mounting structure in the same group has a plurality of mounting parts 2, and there is a clearance groove between the adjacent two mounting parts 2. The clearance groove provides a clearance space for the above-mentioned clearance hole 12 to avoid blocking the clearance hole 12.

[0069] When the energy absorption structure 5 is installed, the energy absorption structure 5 is placed into the accommodating groove 15, and the clearance hole 12 is located in the clearance groove between the adjacent two mounting parts 2. Then, the mounting bolt 14 is passed through the clearance hole 12 as a whole, and the mounting bolt 14 is inserted into the second mounting hole.

[0070] In some possible embodiments, as shown in Figure 1 and Figure 2 , the lower shell body 1 has an inner side reinforcing rib in the cell mounting groove.

[0071] The inner side reinforcing rib includes at least one inner side transverse reinforcing rib 7 arranged along the Y-axis direction and at least one inner side longitudinal reinforcing rib 6 arranged along the X-axis direction. The inner side reinforcing rib can be used to disperse concentrated stress and transmit force transversely, and protect the cell from force.

[0072] The inner side reinforcing rib is arranged in the cell mounting groove of the lower shell body 1, and the inner side reinforcing rib is arranged in a transverse and longitudinal staggered manner. The inner side reinforcing rib can increase the rigidity of the lower shell body 1 and improve the force transmission effect, so as to avoid deformation of the lower shell body 1 and extrusion of the cell.

[0073] The inner reinforcing ribs can adopt a "one horizontal and multiple vertical" configuration, meaning there is one inner transverse reinforcing rib 7 and multiple inner longitudinal reinforcing ribs 6. The inner transverse reinforcing rib 7 is located on the centerline of the cell mounting groove, and the length direction of the multiple inner longitudinal reinforcing ribs 6 is consistent with the X-axis direction, and the multiple inner longitudinal reinforcing ribs 6 are spaced apart along the Y-axis direction. The multiple inner longitudinal reinforcing ribs 6 buffer the impact received in the X-axis direction, enhancing the strength of the bottom plate of the lower housing body 1 while also achieving lateral force transmission. The two ends in the Y-axis direction have energy-absorbing structures 5, which have a strong energy absorption effect, allowing for a suitable reduction in the arrangement of the inner transverse reinforcing ribs 7.

[0074] The inner reinforcing ribs can also be arranged in a "multiple transverse and multiple longitudinal" manner, that is, there are multiple inner transverse reinforcing ribs 7 and multiple inner longitudinal reinforcing ribs 6. The multiple inner transverse reinforcing ribs 7 are distributed at intervals along the X-axis direction, and their length direction is consistent with the Y-axis direction; the length direction of the multiple inner longitudinal reinforcing ribs 6 is consistent with the X-axis direction, and the multiple inner longitudinal reinforcing ribs 6 are distributed at intervals along the Y-axis direction.

[0075] In some possible embodiments, such as Figure 6 , Figure 9 As shown, the mounting structure has mounting holes along the Z-axis and outer reinforcing ribs 4 located around the mounting holes.

[0076] The upper surface of the mounting part 2 is flat, and its lower end forms a downward-opening frame structure. Each frame structure of the mounting part 2 has several longitudinal mounting rings 3, which are integrally formed with the mounting part 2, and mounting holes are formed inside the mounting rings 3. The upper end of the mounting ring 3 extends to the upper surface of the mounting part 2, and the lower end of the mounting ring 3 extends to the lower end of the mounting part 2. Furthermore, the inner cavity of the frame structure of the mounting part 2 has an outer reinforcing rib 4, which includes an outer transverse reinforcing rib and an outer longitudinal reinforcing rib. The outer transverse reinforcing rib and the outer longitudinal reinforcing rib are staggered and superimposed. One or more outer transverse reinforcing ribs and outer longitudinal reinforcing ribs can be used; that is, the outer reinforcing rib 4 has at least one outer transverse reinforcing rib arranged along the Y-axis and at least one outer longitudinal reinforcing rib arranged along the X-axis.

[0077] During construction, to enhance the strength of the mounting section 2, multiple outer transverse reinforcing ribs and multiple outer longitudinal reinforcing ribs can be installed, forming a "multiple transverse and multiple longitudinal" reinforcing structure in the mounting section 2. This "multiple transverse and multiple longitudinal" reinforcing rib arrangement can disperse concentrated stress, improve the rigidity of the mounting section 2, and thus improve the overall rigidity of the lower shell structure. After the rigidity of the mounting section 2 is improved, the overall strength of the mounting structure is optimized. Combined with the energy-absorbing structure 5, it achieves a protective effect that combines rigidity and flexibility, improving the problem of insufficient energy absorption in the lower shell of the battery pack, and further enhancing the strength and reliability of the battery pack.

[0078] The battery pack further comprises the battery pack lower shell and the electric core, and the electric core is installed in the electric core installation slot of the lower shell body.

[0079] The battery pack provided by the utility model has the battery pack lower shell, has all the beneficial effects of the battery pack lower shell, the mounting structure is arranged at the Y axial end portion and forms the accommodating groove 15 structure, the double protection mechanism is formed by cooperating with the deformable energy absorption structure, the problem of shell cracking caused by insufficient energy absorption of the battery pack lower shell is solved, and the strength and reliability of the battery pack lower shell are improved.

[0080] The vehicle further comprises the battery pack lower shell.

[0081] The vehicle provided by the utility model has the battery pack lower shell, has all the beneficial effects of the battery pack lower shell, the mounting structure is arranged at the Y axial end portion and forms the accommodating groove 15 structure, the double protection mechanism is formed by cooperating with the deformable energy absorption structure, the problem of shell cracking caused by insufficient energy absorption of the battery pack lower shell in the vehicle is solved, the strength and reliability of the battery pack lower shell are improved, and the stability of the vehicle is improved.

[0082] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A lower housing of a battery pack, characterized in that, The device includes a lower housing body (1), a mounting structure, and an energy-absorbing structure (5). At least one set of mounting structures is provided. The mounting structure is located at the end of the lower housing body (1) along the Y-axis direction. The mounting structure and the outer side wall of the lower housing body (1) have a downward-opening receiving groove (15). The energy-absorbing structure (5) is embedded in the receiving groove (15) and is detachably connected to the lower housing body (1). The energy-absorbing structure (5) is a deformable structure.

2. The lower housing of the battery pack as described in claim 1, characterized in that, The lower housing body (1) has a horizontally extending folded edge structure (13) on the outer periphery of the opening end. The upper end of the mounting structure is connected to the outer edge of the folded edge structure (13), and the lower end of the mounting structure is located below the folded edge structure (13). The lower housing body (1), the folded edge structure (13) and the mounting structure enclose the receiving groove (15).

3. The lower housing of the battery pack as described in claim 2, characterized in that, The width of the receiving groove (15) gradually decreases from the opening of the receiving groove (15) toward the bottom of the groove.

4. The lower housing of the battery pack as described in claim 1, characterized in that, The energy-absorbing structure (5) has a first mounting surface (8) and a second mounting surface (9). The first mounting surface (8) is connected to the bottom of the receiving groove (15), and the second mounting surface (9) is connected to the outer wall of the lower housing body (1).

5. The lower housing of the battery pack as described in claim 4, characterized in that, The energy-absorbing structure (5) is a frame structure. The energy-absorbing structure (5) has an energy-absorbing cavity (10) inside. The lower end of the energy-absorbing structure (5) is provided with a drainage hole (11), which is connected to the energy-absorbing cavity (10).

6. The lower housing of the battery pack as described in claim 5, characterized in that, The energy-absorbing chamber (10) has two parts, which are longitudinally spaced apart; the energy-absorbing structure (5) includes a central partition between the two energy-absorbing chambers (10), and the drainage hole (11) is provided on both the central partition and the bottom plate of the energy-absorbing structure (5).

7. The lower housing of the battery pack as described in claim 1, characterized in that, The lower housing body (1) has an inner reinforcing rib in the cell mounting groove.

8. The lower housing of the battery pack as described in claim 1, characterized in that, The mounting structure has mounting holes along the Z-axis and outer reinforcing ribs (4) located around the mounting holes.

9. A battery pack, characterized in that, The battery pack includes the lower housing as described in any one of claims 1-8, and also includes a battery cell, wherein the battery cell is installed in a battery cell mounting slot in the lower housing body (1).

10. A vehicle, characterized in that, Includes the lower housing of the battery pack as described in any one of claims 1-8.

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