A battery pack box body, a battery cell integrated vehicle body and an electric vehicle

Abstract

The embodiments of the present application provide a battery pack case, a battery cell integrated body and an electric vehicle. The battery pack case includes a shell, an upper cover and a reinforcement structure; the shell includes a bottom shell and a surrounding frame, the surrounding frame is fixed to the bottom shell and protrudes from the bottom shell to form a space for accommodating the battery cell; the reinforcement structure includes at least one longitudinal beam and a plurality of cross beam brackets; each longitudinal beam is fixed to the surrounding frame along the length direction of the electric vehicle; any cross beam bracket is fixed between a longitudinal beam and the surrounding frame or between any two adjacent longitudinal beams along the width direction of the electric vehicle; the cross beam bracket is arched and protrudes in the direction away from the bottom shell; the upper cover is sealed and fixed to the top of the surrounding frame away from the bottom shell, the upper cover is fixedly connected to the cross beam bracket, and the upper cover is used to constitute at least a part of the floor of the frame. The battery pack case can be integrated with the frame, and the top of the battery pack case can constitute at least a part of the frame bottom plate and provide sufficient pedaling rigidity to meet the strength requirements of the frame.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a battery pack box, a battery cell integrated body and an electric vehicle. Background Art

[0002] With the continuous development of new energy vehicles, the integration method of electric vehicle batteries is also constantly improving. Cell to body (CTB) is a new technology for battery-body integration. Cell to body technology can integrate the upper cover of the battery pack and the floor of the body into one structure, which can further realize battery integration and structural integration.

[0003] A common solution for integrating battery cells into vehicle bodies in the prior art is to use the sheet metal base of the vehicle body as the upper cover of the blade battery. The blade battery can serve as a structural component to support the force of the occupants stepping on it, and the side tabs are not affected, and there will be no failures such as high-voltage short circuits. However, this solution is only applicable to blade batteries. For the solution of integrating square battery cells into vehicle bodies, it is currently a technical difficulty to take into account both battery sealing and stepping stiffness. Summary of the invention

[0004] The embodiments of the present application provide a battery pack case, a battery cell integrated body and an electric vehicle. The battery pack case can be integrated with the frame, and the top of the battery pack case can constitute at least a part of the frame bottom plate and provide sufficient pedaling rigidity to meet the strength requirements of the frame.

[0005] In the first aspect, a battery pack case is provided, which can be used to integrate with the frame of an electric vehicle to realize the integration of the battery cell and the frame. The battery pack case includes a shell, an upper cover and a reinforcement structure. Among them, the shell includes a bottom shell and a frame, the frame is fixed to the bottom shell and protrudes from the bottom shell to form a space for accommodating the battery cell, and the frame and the bottom shell can be in an open box shape to facilitate the accommodation of the battery cell. The reinforcement structure is fixed to the frame to increase the strength of the shell, and the reinforcement structure includes at least one longitudinal beam and a plurality of cross beam brackets. Each longitudinal beam is fixed to the frame along the length direction of the electric vehicle, and the longitudinal beam can provide support along the length direction of the electric vehicle. Any cross beam bracket is fixed between a longitudinal beam and the frame or between any two adjacent longitudinal beams along the width direction of the electric vehicle, and the cross beam bracket can provide support along the width direction of the electric vehicle. Specifically, the cross beam bracket has two possible connection states, one is connected between the frame and a longitudinal beam, and the other is connected between two longitudinal beams when there are at least two longitudinal beams. Along the width direction of the electric vehicle, the cross beam bracket is arched and protrudes in a direction away from the bottom shell. When subjected to force, the cross beam bracket can transfer the force to the lower ends to the longitudinal beam and the surrounding frame, thereby improving the supporting force. The upper cover is sealed and fixed to the top of the surrounding frame away from the bottom shell, and the upper cover is fixedly connected to the cross beam bracket, and the upper cover is used to form at least a part of the floor of the frame.

[0006] The upper cover of the battery pack box provided in the present application can be used as the floor of the frame. The reinforcing structure fixed to the frame has sufficient structural strength, which can improve the bearing capacity of the shell, so that the upper cover has sufficient pedaling rigidity to meet the strength requirements of the frame floor. Integrating the battery pack box with the frame can release the space of the original multi-layer structure between the battery pack and the floor, which can improve the volume utilization of the battery system and place more batteries in the same space. In addition, the sealed connection between the upper cover and the shell of the battery pack box can ensure the safety of the battery pack.

[0007] In one possible implementation, the cross beam support includes at least one bending structure along the width direction of the electric vehicle, and the bending structure protrudes in a direction away from the bottom shell. For the entire cross beam support, the existence of the bending structure allows a certain amount of compressive stress and tensile stress to be formed inside the cross beam support when the cross beam support is subjected to force, which can partially offset the effect of external force, thereby improving strength.

[0008] In order to facilitate the connection and fixing of the upper cover, the bending structure has a support surface parallel to the bottom shell, and the upper cover is at least partially fixed to the support surface. The support surface and the upper cover can achieve surface contact connection, increase the contact area, and improve the support effect.

[0009] In one possible implementation, at least two bending structures are arranged along the length direction of the electric vehicle, so that the crossbeam bracket forms at least two support surfaces along the length of the electric vehicle, and each support surface is coplanar, which can improve the support force. Among them, the at least two bending structures are arranged at intervals, so that the crossbeam bracket can form multiple bending nodes, further enhancing the support force.

[0010] In one possible implementation, the battery pack body is provided with a plurality of cross beam assemblies along the length direction of the electric vehicle. Each cross beam assembly includes a plurality of cross beam brackets, and the plurality of cross beam brackets are arranged end to end in sequence along the width direction of the electric vehicle. The plurality of cross beam brackets are arranged end to end in a regular pattern along the width direction of the electric vehicle, and can form a supporting force along the width direction of the electric vehicle. In a specific implementation, a plurality of cross beam assemblies can be provided along the length direction of the electric vehicle according to the structural layout of the electric vehicle to improve the supporting strength of the housing.

[0011] Possibly, along the width direction of the electric vehicle, the size of each crossbeam bracket is the same. The two ends of the crossbeam bracket are either connected to a longitudinal beam and the surrounding frame, or connected to two adjacent longitudinal beams. It can be considered that the longitudinal beam divides the surrounding frame into multiple areas along the width direction of the electric vehicle, and the width of each area is adapted to the width of the crossbeam bracket, so that the shell has a balanced supporting force along the width direction of the electric vehicle.

[0012] In the second aspect, a battery cell integrated body is provided, which includes a frame, a battery cell and any one of the battery pack boxes provided in the first aspect. The frame includes a front section, a rear section and two threshold beams connected between the front section and the rear section, the front section and the rear section are respectively fixed to the two ends of the frame along the length direction of the electric vehicle, the two threshold beams are respectively fixed to the two ends of the frame along the width direction of the electric vehicle, and the upper cover constitutes at least a part of the floor of the frame. The battery cell is accommodated between the shell and the upper cover, and the upper cover is sealed with the shell to ensure the safety of the battery pack. The battery cell integrated body integrates the battery pack box with the frame, which is equivalent to integrating the battery cell with the frame. The structure of the battery pack box has sufficient pedaling rigidity, and the upper cover of the battery pack box can constitute at least a part of the floor of the frame, which can meet the strength requirements of the frame floor.

[0013] In one possible implementation, the battery pack body is provided with a plurality of cross beam assemblies along the length direction of the electric vehicle. Each cross beam assembly includes a plurality of cross beam brackets, which are arranged end to end along the width direction of the electric vehicle to form a supporting force along the width direction of the electric vehicle. In a specific implementation, a plurality of cross beam assemblies can be provided along the length direction of the electric vehicle according to the structural layout of the electric vehicle to improve the supporting strength of the housing.

[0014] In a possible implementation, along the length direction of the electric vehicle, a plurality of crossbeam assemblies are divided into three groups, each group of crossbeam assemblies includes at least one crossbeam assembly, and the three groups of crossbeam assemblies are arranged at intervals along the length direction of the electric vehicle. The three groups of crossbeam assemblies include a first group of crossbeam assemblies, a second group of crossbeam assemblies, and a third group of crossbeam assemblies. In combination with the structure of the frame, the first group of crossbeam assemblies are arranged between two crossbeams of the front row seats of the frame. The second group of crossbeam assemblies are arranged before the first base point and before the front crossbeam of the front row seats of the frame. The first base point is the positive projection of the front row passenger's sitting buttocks on the bottom shell, and the second group of crossbeam assemblies can be used to bear the pedaling force of the front row passengers or the driver. The third group of crossbeam assemblies are arranged between the second base point and the rear crossbeam of the front row seats of the frame. The second base point is the positive projection of the rear row passenger's sitting buttocks on the bottom shell, and the third group of crossbeam assemblies can be used to bear the pedaling force of the rear row passengers.

[0015] Specifically, the distance between the second group of beam assemblies and the first base point is 600±100 mm, and the distance between the third group of beam assemblies and the second base point is 600±150 mm.

[0016] In one possible implementation, along the length direction of the electric vehicle, the size of the beam bracket in the first group of beam assemblies is larger than the size of the beam bracket in the second group of beam assemblies to meet the supporting force requirements at different positions.

[0017] In one possible implementation, along the length direction of the electric vehicle, the third group of cross-beam assemblies includes a plurality of cross-beam assemblies, and the plurality of cross-beam assemblies are adjacently arranged along the length direction of the electric vehicle to increase support strength.

[0018] In the third aspect, an electric vehicle is provided, which includes any one of the battery cell integrated bodies provided in the first aspect. Since the battery cell integrated body has a high degree of integration and strength. Among them, the upper cover of the battery pack box as part of the bottom plate of the frame can ensure sufficient pedaling rigidity and meet the sealing safety requirements of the battery pack. For the entire electric vehicle, the vertical riding space in the car will also be increased, improving the riding comfort of passengers.

[0019] For the technical effects that can be achieved in the above-mentioned second and third aspects, please refer to the description of the technical effects that can be achieved by the corresponding design scheme in the above-mentioned first aspect, and this application will not repeat them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application;

[0021] Figure 2a A schematic diagram of the structure of a battery cell integrated with a vehicle body provided in an embodiment of the present application;

[0022] Figure 2b A schematic structural diagram of a frame of a battery-integrated vehicle body provided in an embodiment of the present application;

[0023] Figure 3a A schematic diagram of the structure of a battery pack in a vehicle body with integrated battery cells provided in an embodiment of the present application;

[0024] Figure 3b A schematic diagram of a structure of a hidden upper cover of a battery pack in a battery cell integrated vehicle body provided in an embodiment of the present application;

[0025] Figure 4a A schematic diagram of the structure of a battery pack housing provided in an embodiment of the present application;

[0026] Figure 4b A schematic diagram of the structure of a battery pack housing provided in an embodiment of the present application;

[0027] Figure 5a A simplified structural schematic diagram of a battery pack housing provided in an embodiment of the present application;

[0028] Figure 5b A schematic diagram of the structure of a battery pack box and a vehicle frame provided in an embodiment of the present application;

[0029] Figure 5cA schematic diagram of the cooperation between a battery pack box body and a vehicle frame provided by an embodiment of the present application;

[0030] Figure 6 A schematic diagram of the connection structure of a crossbeam bracket in a battery pack box body provided by an embodiment of the present application;

[0031] Figure 7a For Figure 6 A schematic cross-sectional structure diagram at the V1-V1 position in

[0032] Figure 7b For Figure 7a A schematic diagram of the cooperation between the shown structure and the upper cover;

[0033] Figure 8a For Figure 6 A schematic cross-sectional structure diagram at the V2-V2 position in

[0034] Figure 8b For Figure 8a A schematic diagram of the cooperation between the shown structure and the upper cover. Specific embodiments

[0035] The technology of integrating battery cells into the vehicle body is a technology that integrates battery cells into the vehicle body. The upper cover of the battery pack can be used as the floor of the whole vehicle, and the body-in-white of the vehicle has no sheet metal floor structure. In the prior art, one design idea of integrating battery cells into the vehicle body is to use the upper cover of the battery pack as the floor of the body-in-white, and the body-in-white itself has no floor. This technology of integrating battery cells into the vehicle body is only applicable to blade batteries. Since the blade batteries are arranged densely horizontally, they can support the force when passengers step on the upper cover of the battery well. And the tabs of the battery are on both sides. After the upper cover of the battery is subjected to the stepping pressure, no failure conditions such as high-voltage short circuit will occur. Another design idea of integrating battery cells into the vehicle body is to use the floor of the body-in-white as the upper cover of the battery pack, and the battery pack itself has no upper cover. This structure has extremely high requirements for the sealing of the battery pack and the assembly and manufacturing level with the vehicle body. Moreover, the battery pack without an upper cover needs to be well protected against dust and water during transportation, resulting in relatively high logistics costs. The square battery is a common form in the new energy field. The tabs of this battery generally face the top or the bottom. When applying the technology of integrating battery cells into the vehicle body to the square battery, on the premise of meeting the sealing requirements of the battery pack, it is necessary to focus on considering the stepping rigidity of the upper cover of the battery pack to ensure high-voltage functional safety.

[0036] Based on this, the embodiments of the present application provide a battery pack box body, a battery cell integrated vehicle body and an automobile. The battery pack box body can ensure the sealing requirements of the battery, and the upper cover of the battery pack has sufficient strength. When the upper cover of the battery pack is applied to the technology of integrating battery cells into the vehicle body, the upper cover of the battery pack can meet the stepping stiffness requirements of passengers.

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following further describes this application in detail with reference to the accompanying drawings.

[0038] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit this application. As used in the specification and claims of this application, the singular forms "a", "an", "the", "above-mentioned", "said", and "this" are also intended to include expressions such as "one or more", unless the context clearly indicates otherwise.

[0039] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of this application. Thus, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having", and their variants mean "including but not limited to", unless otherwise specifically emphasized.

[0040] As Figure 1 shown, an embodiment of this application provides an electric vehicle, which includes an upper vehicle body 200, a lower vehicle body 100, and an electric core 300. The upper vehicle body 200 and the lower vehicle body 100 are combined to form the overall structure of the electric vehicle. The electric core 300 can be directly integrated and installed on the lower vehicle body 100 to achieve the integrated integration of the electric core into the vehicle body. When the integrated integration technology of integrating the electric core into the vehicle body is used in the electric vehicle, the strength of the whole vehicle will be improved, and the roll during high-speed cornering will also become smaller, which can improve the controllability and driving safety of the electric vehicle.

[0041] Figure 2a shows an electric-core integrated vehicle body provided by an embodiment of this application, and this electric-core integrated vehicle body can be used as Figure 1 the lower vehicle body 100 shown in Figure 2aAs shown, the battery cell integrated body includes a vehicle frame 20, a battery pack box 10, and battery cells 30. The battery cells 30 are accommodated in the battery pack box 10 and are thus shown in dashed lines. The vehicle frame 20 and the battery pack box 10 are integrated together, which can improve the overall strength of the vehicle frame. When the electric vehicle is in different road conditions, the deformation amount of components such as the chassis of the vehicle frame structure can be reduced. By integrating the vehicle frame 20 and the battery pack box 10, the top of the battery pack box 10 can be used as the floor of the vehicle frame 20, releasing the space of the multi-layer structure between the original battery pack and the floor, which can improve the volume utilization rate of the battery system and more batteries can be placed in the same space. By integrating the vehicle frame 20 and the battery pack box 10, a part of the structure is saved, which can reduce the mass of the battery cells integrated into the vehicle body and can also reduce the cost. In addition, for the entire electric vehicle, the vertical seating space in the carriage will also increase, improving the comfort of the passengers' riding experience. The reduction of the overall vehicle height can also improve the aerodynamic resistance of the electric vehicle and improve the performance of the electric vehicle. In some embodiments, by selecting appropriate materials and mechanism designs, the space for the heads of the driver and passengers can be saved by about 20 mm, and the overall vehicle can be reduced in weight by about 4 - 7 kg, so that the overall vehicle cost can be reduced by several hundred yuan.

[0042] Please continue to refer to Figure 2b the vehicle frame 20 shown. The vehicle frame 20 includes a front section 201, a rear section 202, and two sill beams 203 connected between the front section 201 and the rear section 202. The two sill beams 203 are arranged opposite to and spaced apart from each other. An opening-shaped space K is enclosed between the front section 201, the rear section 202, and the two sill beams 203. When the vehicle frame 20 is matched with the battery pack box 10, the battery pack box 10 is welded to the front section 201, the rear section 202, and the two sill beams 203, so that the top of the battery pack box 10 can at least partially cooperate with the opening-shaped space K, and the top of the battery pack box 10 can serve as the floor of the vehicle frame 20.

[0043] Figure 3a shows the battery pack provided by the embodiment of the present application. This battery pack can be considered as the structure after the integration of the battery pack 30 and the battery pack box 10. As Figure 3a shown, the battery pack box 10 includes a housing 1 and an upper cover 2. The upper cover 2 is fixed to the top of the housing 1. When the battery pack box 10 is integrated with the vehicle frame 20 to form a battery cell integrated body, the upper cover 2 is the floor of the battery cell integrated body. The battery cells 30 are accommodated in the battery pack box 10 and are not shown.

[0044] Figure 3b shows the structure of the battery pack after hiding the upper cover 2. As Figure 3bAs shown in the figure, the housing 1 includes a bottom case 11, a surrounding frame 12, and a strengthening structure 3. The surrounding frame 12 is fixed to the bottom case 11 and protrudes from the bottom case 11. Exemplarily, the bottom case 11 is rectangular, the surrounding frame 12 is arranged along the edge of the bottom case 11, and the structure formed by the combination of the surrounding frame 12 and the bottom case 11 is in the shape of an open box. The strengthening structure 3 is fixed to the surrounding frame 12, and specifically includes at least one longitudinal beam 31 and a plurality of cross beam brackets 321, and the cross beam brackets 321 are in an arch shape. The longitudinal beam 31 extends along the length direction of the electric vehicle to provide support, and the cross beam brackets 321 extend along the width direction of the electric vehicle to provide support. Among them, either both ends of any one cross beam bracket 321 are fixed to a longitudinal beam 31 and the surrounding frame 12, or both ends are fixed to two adjacent longitudinal beams 31. The longitudinal beam 31 can divide the space surrounded by the surrounding frame 12 into a plurality of battery cell accommodation grooves along the width direction of the electric vehicle, and the battery cells 30 can be accommodated in the battery cell accommodation grooves. Among them, the cross beam brackets 321 can span across the top of the battery cells 30 along the width direction of the electric vehicle, and while playing a supporting role, they can also play a role in protecting the battery cells 30. When cooperating with the upper cover 2, the upper cover 2 can be covered on the top of the surrounding frame 12, and the upper cover 2 can be fixedly connected to the cross beam brackets 321, and the cross beam brackets 321 provide sufficient strength support for the upper cover 2. Among them, the upper cover 2 and the surrounding frame 12 can be fixedly connected by welding and sealed to provide good protection for the battery cells accommodated in the battery pack housing 10.

[0045] Figure 4a The structure of the housing 1 is shown. With the electric vehicle as a reference, the surrounding frame 12 of the housing 1 can be considered to be composed of two first side shells 121 and two second side shells 122. Along the length direction of the electric vehicle, the two first side shells 121 are arranged opposite to each other. Along the width direction of the electric vehicle, the two second side shells 122 are arranged opposite to each other. One first side shell 121, one second side shell 122, the other first side shell 121, and the other second side shell 122 are sequentially connected end to end along the edge of the bottom case 11 to form the surrounding frame 12. A part of the cross beam brackets 321 are connected between a longitudinal beam 31 and the adjacent second side shell 122, and the cross beam brackets 321 are parallel to the width direction of the electric vehicle. When there are at least two longitudinal beams 31, at least one cross beam bracket 321 is also connected between any two adjacent longitudinal beams 31. The surrounding frame 12 further includes an auxiliary side shell 123 located between the two first side shells 121. Both ends of the auxiliary side shell 123 are respectively connected to the two second side shells 122, and the auxiliary side shell 123 is parallel to the first side shell 121, that is, the auxiliary side shell 123 is parallel to the width direction of the electric vehicle. With the length direction of the electric vehicle as a reference, the auxiliary side shell 123 is close to the first side shell 121 located at the rear of the vehicle. Both ends of each longitudinal beam 31 are respectively connected between the first side shells 121 located at the front of the vehicle. A certain space is left between the auxiliary side shell 123 and the first side shell 121, which is beneficial to optimizing the structural design of the housing 1 while ensuring the strength of the housing 1.

[0046] Please continue to refer to Figure 4a As shown, the longitudinal beam 31 can divide the internal space of the frame 12 into at least two areas for accommodating battery cells along the width direction of the electric vehicle. The longitudinal beam 31 can play a connecting and supporting role in the length direction of the electric vehicle, and the force is continuous in the length direction of the electric vehicle, and the structural stability is stronger. On the basis of the longitudinal beam 31, the crossbeam bracket 321 is connected between two adjacent longitudinal beams 31 or between the longitudinal beam 31 and the second side shell 122, and can play a connecting and supporting role in the width direction of the electric vehicle. Among them, the crossbeam bracket 321 is arched and protrudes in the direction away from the bottom shell 11. When the crossbeam bracket 321 is compressed, it can transfer the force downward to the longitudinal beam 31 and the second side shell 122, so as to withstand greater pressure, thereby improving the bearing capacity of the shell 1, so that the upper cover 2 has sufficient pedaling rigidity to meet the strength requirements of the frame floor.

[0047] exist Figure 4a In the shell 1 structure shown, multiple crossbeam brackets 321 are arranged according to certain rules. For example, along the length direction of the electric vehicle, two first side shells 121 can be provided with multiple crossbeam assemblies 32. There can be multiple crossbeam assemblies 32, and along the length direction of the electric vehicle, multiple crossbeam assemblies 32 are arranged at intervals. Each crossbeam assembly 32 includes multiple crossbeam brackets 321 arranged end to end in sequence along the width direction of the electric vehicle. One of the crossbeam brackets 321 is connected between one of the second side shells 122 and the adjacent longitudinal beam 31, and another crossbeam bracket 321 is connected between another second side shell 122 and the adjacent longitudinal beam 31. When the number of longitudinal beams 31 is at least two, a crossbeam bracket 321 is connected between any two adjacent longitudinal beams 31.

[0048] by Figure 4a Taking the two longitudinal beams 31 as an example, each cross beam assembly 32 includes three cross beam brackets 321, the first cross beam bracket 321 is connected between one of the second side shells 122 and one of the longitudinal beams 31, the second cross beam bracket 321 is connected between the two longitudinal beams 31, and the third cross beam bracket 321 is connected between the other second side shell 122 and the other longitudinal beam 31. The multiple cross beam brackets 321 in each cross beam assembly 32 are arranged along the width direction of the electric vehicle, so that the multiple cross beam brackets 321 in the cross beam assembly 32 can form a coherent force-bearing structure extending along the width direction of the electric vehicle, further improving the pedaling stiffness of the upper cover 2. Of course, the multiple cross beam brackets 321 can also be arranged irregularly.

[0049] Among them, the longitudinal beam 31 and the two second side shells 122 are stressed along the length direction of the electric vehicle. To equalize the stress, the two second side shells 122 and all the longitudinal beams 31 can be evenly arranged along the width direction of the electric vehicle, so that the stress of the upper cover 2 in the length direction of the electric vehicle can be evenly distributed along the width direction of the electric vehicle. Specifically, along the width direction of the electric vehicle, the size between each second side shell 122 and the adjacent longitudinal beam 31 is the same, and the size of each cross beam bracket 321 along the width direction of the electric vehicle is equal. When the number of longitudinal beams 31 is at least two, the size between each second side shell 122 and the adjacent longitudinal beam 31 is the same as the size between any two adjacent longitudinal beams 31.

[0050] Figure 4b Fig. shows another structure of the shell 1. The longitudinal beam 31 is arranged along the length direction of the electric vehicle, and both ends of the longitudinal beam 31 are fixed to the two first side shells 121. In this structure, the stress of the longitudinal beam 31 between the two first side shells 121 is continuous throughout the shell 1, and the strength can be higher.

[0051] In a specific implementation manner, Figure 5a illustrates Figure 4a the simplified structure of the shell 1 shown. Along the length direction of the electric vehicle, the battery pack box 10 is provided with a plurality of cross beam assemblies 32, and the plurality of cross beam assemblies 32 are divided into three groups. Each group of cross beam assemblies 32 includes one cross beam assembly 32, and the three groups of cross beam assemblies 32 are arranged at intervals along the length direction of the electric vehicle. The three groups of cross beam assemblies 32 are the first group of cross beam assemblies 32a, the second group of cross beam assemblies 32b, and the third group of cross beam assemblies 32c respectively. Along the direction from the front of the electric vehicle to the rear of the electric vehicle, the first group of cross beam assemblies 32a is located between the second group of cross beam assemblies 32b and the third group of cross beam assemblies 32c.

[0052] Further combined with Figure 5b shown, taking the vehicle frame 20 of the electric vehicle as a reference, the vehicle frame 20 includes two front row cross beams 204 of the front row seats, namely the front first cross beam 2041 and the second cross beam 2042. The first cross beam 2041 and the second cross beam 2042 are slidably arranged between the two sill beams 203 along the length direction of the electric vehicle. Along the length direction of the electric vehicle, the first cross beam 2041 can be regarded as the previous front row cross beam 204 of the front row seat, and the second cross beam 2042 can be regarded as the rear front row cross beam 204 of the front row seat. The vehicle frame 20 of the electric vehicle further includes a rear row cross beam 205 of the rear row seat, and the rear row cross beam 205 is connected between the two sill beams 203.

[0053] Figure 5cThe figure shows a schematic diagram of the stress state simulated by the battery cell integrated vehicle body 100. The first set of crossbeam assemblies 32a among the above three sets of crossbeam assemblies 32 is arranged between two front crossbeams 204 of the front row seats, that is, the first set of crossbeam assemblies 32a is located between the first crossbeam 2041 and the second crossbeam 2042, and the first set of crossbeam assemblies 32a can be used to bear the pressure of the front row driver and passengers on the electric vehicle floor. The second set of crossbeam assemblies 32b is arranged before the first reference point P1 and before the front crossbeam 204 of the front row seat of the vehicle frame 20, that is, the second set of crossbeam assemblies 32b is arranged before the first reference point P1 and before the first crossbeam 2041. At this time, the second set of crossbeam assemblies 32b is used to bear the pressure of the front row driver and passengers stepping on the electric vehicle floor. Among them, the first reference point P1 refers to the position of the projection of the buttocks of the front row driver and passengers in the sitting posture on the bottom shell 1 in the longitudinal direction of the electric vehicle. Specifically, the distance H1 between the second set of crossbeam assemblies 32b and the first reference point P1 is 600±100mm. The third set of crossbeam assemblies 32c is arranged between the second reference point P2 and the rear crossbeam 204 of the front row seat of the vehicle frame 20, that is, the third set of crossbeam assemblies 32c is arranged between the second reference point P2 and the front crossbeam 204b. At this time, the third set of crossbeam assemblies 32c is used to bear the pressure of the rear passengers stepping on the electric vehicle floor. Among them, the second reference point P2 refers to the position of the projection of the buttocks of the rear row passengers in the sitting posture on the bottom shell 1 in the longitudinal direction of the electric vehicle. Specifically, the distance H2 between the third set of crossbeam assemblies 32c and the second reference point P2 is 600±150mm.

[0054] For the arrangement positions of the three sets of crossbeam assemblies 32, the arrangement mode of the crossbeam brackets 321 in each set of crossbeam assemblies 32 can also be adaptively improved. Referring together Figures 5a to 5c , by way of example, one crossbeam assembly 32 is provided in the first set of crossbeam assemblies 32a, and one crossbeam assembly 32 is provided in the second set of crossbeam assemblies 32b. Based on the different forces on the first set of crossbeam assemblies 32a and the second set of crossbeam assemblies 32b, along the longitudinal direction of the electric vehicle, the size of the crossbeam brackets 321 in the first set of crossbeam assemblies 32a can be set to be larger than the size of the crossbeam brackets 321 in the second set of crossbeam assemblies 32b, so that the supporting force of the first set of crossbeam assemblies 32a is stronger than that of the second set of crossbeam assemblies 32b. Or, the specifications and sizes of the crossbeam brackets 321 in the first set of crossbeam assemblies 32a are the same as those of the crossbeam brackets 321 in the second set of crossbeam assemblies 32b. One crossbeam assembly 32 is provided in the first set of crossbeam assemblies 32a, and two crossbeam assemblies 32 are provided in the second set of crossbeam assemblies 32b. Generally, the supporting force of the third set of crossbeam assemblies 32b is stronger than that of the first set of crossbeam assemblies 32a and the second set of crossbeam assemblies 32b. Therefore, at least two crossbeam assemblies 32 are provided in the third set of crossbeam assemblies 32c, and the at least two crossbeam assemblies 32 are arranged adjacent to each other along the longitudinal direction of the electric vehicle to improve the supporting force.

[0055] Figure 6 It shows a schematic structure of a crossbeam bracket 321 connected to the second side shell 122 and the longitudinal beam 31. The second side shell 122 extends along the length direction of the electric vehicle, and the crossbeam bracket 321 extends along the width direction of the electric vehicle.

[0056] Figure 7a It shows that the crossbeam bracket 321 is along Figure 6 The cross-sectional structure cut along the V1-V1 plane shown, and this cross-section is parallel to the length direction of the electric vehicle. As Figure 7a shown, along the length direction of the electric vehicle, that is, the direction perpendicular to the extending direction of the crossbeam bracket 321, the crossbeam bracket 321 includes at least one bending structure 3211, and the bending structure 3211 protrudes in a direction away from the bottom shell 11. The two end portions of the crossbeam bracket 321 are respectively used to connect the second side shell 122 and the longitudinal beam 31, and the bending structure 3211 protrudes in a direction away from the bottom shell 11, making the crossbeam bracket 321 in an arch shape. When the crossbeam bracket 321 is stressed, the protruding part of the bending structure 3211 bears the external force and transmits the force to the second side shell 122 and the longitudinal beam 31 at the end of the crossbeam bracket 321, so that the crossbeam bracket 321 can bear a greater force. For the entire crossbeam bracket 321, the existence of the bending structure 3211 causes certain compressive stress and tensile stress to be formed inside the crossbeam bracket 321 when it is stressed, which can partially offset the action of the external force, thereby improving the strength.

[0057] As Figure 7a shown, the bending structure 3211 is approximately trapezoidal, and each bending structure 3211 forms four bending nodes J, and the crossbeam bracket 321 bends at these four nodes J to form the bending structure 3211. The bending structure 1411 not only plays the role of force transmission of the arch bridge, but also can play the role of structural strengthening, further improving the supporting effect of the crossbeam bracket 321.

[0058] In specific implementation, along the length direction of the electric vehicle, there are at least two bending structures 3211 arranged, so that the crossbeam bracket 321 forms at least two supporting surfaces M along the length of the electric vehicle, and each supporting surface M is coplanar, which can improve the supporting force. Among them, the at least two bending structures 3211 are arranged at intervals, so that the crossbeam bracket 321 can form multiple bending nodes J, further enhancing the supporting force.

[0059] As Figure 7aAs shown, the crossbeam bracket 321 includes two bending structures 3211, which are spaced apart in the width direction of the electric vehicle. Each bending structure 3211 is in a convex shape facing away from the bottom case 11, and a convex shape facing the bottom case 11 is formed between the two bending structures 3211. The two bending structures 3211 enable the crossbeam bracket 321 to form eight bending nodes J, further improving the supporting force of the crossbeam bracket 321.

[0060] Specifically, as Figure 7a shown, the bending structure 3211 has a supporting surface M parallel to the bottom case 11, and this supporting surface M can be used to receive the action of force.

[0061] As Figure 7b shown, when the upper cover 2 is fixed to the housing 1, the surface of the upper cover 2 facing the bottom case 11 can be fixed to the supporting surface M of the bending structure 3211 by spot welding or riveting. A surface contact connection can be achieved between the supporting surface M and the upper cover 2, increasing the contact area and enhancing the supporting effect. During the assembly process of the battery pack housing 10 provided in the embodiment of the present application, the upper cover 2 is first connected to the crossbeam bracket 321, and the connection process can be spot welding or riveting.

[0062] Figure 8a shows the cross-sectional structure of the crossbeam bracket 321 cut along the Figure 6 V2-V2 plane shown, and this cross-section is perpendicular to the length direction of the electric vehicle. As Figure 8a shown, both ends of the crossbeam bracket 321 are respectively fixed to the longitudinal beam 31 and the second side shell 122. The cross-section of the longitudinal beam 31 is exemplified as C-shaped, and the cross-section of the longitudinal beam 31 can also be in various forms such as rectangular, T-shaped, I-shaped, H-shaped, etc. The second side shell 122 is in a hollowed-out frame structure, which can reduce the overall structural mass while ensuring sufficient strength.

[0063] Referring to Figure 7a the cross-section of the crossbeam bracket 321 shown, Figure 8a the V2-V2 plane shown passes through the concave part between the two bending structures 3211. Therefore, in the Figure 8a view shown, one of the bending structures 3211 can be seen. As Figure 8b shown, when the upper cover 2 is fixed to the housing 1, the upper cover 2 contacts and connects with the supporting surface M of this bending structure 3211.

[0064] In summary, the cell-integrated vehicle body provided in the embodiment of the present application integrates the frame 20 and the battery pack case 10, and utilizes the upper cover 2 of the battery pack case 10 to constitute at least a portion of the floor of the frame 20, thereby eliminating the need for structure and achieving lightweight and weight reduction of the vehicle. The shell 1 of the battery pack case 10 is reinforced by the reinforcing structure 3, and can provide sufficient support force for the upper cover 2, so that the upper cover 2 can maintain sufficient pedaling stiffness to meet the strength requirements of the frame. In addition, the integration of the frame 20 and the battery pack case 10 can increase the head space for the driver and passengers, enhance the competitiveness of the entire vehicle, and also perform well in reducing vehicle height and improving wind resistance.

[0065] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A battery pack housing (10), characterized in that, The battery pack housing (10) is used to be integrated into the frame (20) of an electric vehicle; the battery pack housing (10) includes: a housing (1), an upper cover (2), and a strengthening structure (3); The housing (1) includes a bottom shell (11) and a surrounding frame (12), and the surrounding frame (12) is fixed to the bottom shell (11) and protrudes from the bottom shell (11) to form a space for accommodating the battery cells (30); The strengthening structure (3) includes at least one longitudinal beam (31) and a plurality of cross beam assemblies (32); each longitudinal beam (31) is fixed to the surrounding frame (12) along the length direction of the electric vehicle; each cross beam assembly (32) includes a plurality of cross beam brackets (321), and the plurality of cross beam brackets (321) are arranged end to end in sequence along the width direction of the electric vehicle; any one of the cross beam brackets (321) is fixed between one longitudinal beam (31) and the surrounding frame (12) or between any two adjacent longitudinal beams (31) along the width direction of the electric vehicle; along the width direction of the electric vehicle, the cross beam bracket (321) is arched and protrudes in a direction away from the bottom shell (11), and the cross beam bracket (321) is used to span the top of the battery cells (30); the upper cover (2) is hermetically fixed to the top of the surrounding frame (12) facing away from the bottom shell (11), and the upper cover (2) is fixedly connected to the cross beam bracket (321), and the upper cover (2) is used to form at least a part of the floor of the frame (20); The plurality of cross beam assemblies (32) includes a first group of cross beam assemblies (32a), a second group of cross beam assemblies (32b), and a third group of cross beam assemblies (32c) arranged at intervals along the length direction of the electric vehicle, and each of the first group of cross beam assemblies (32a), the second group of cross beam assemblies (32b), and the third group of cross beam assemblies (32c) includes at least one cross beam assembly (32); The first group of cross beam assemblies (32a) is used to be arranged between two front cross beams (204) of the front row seats of the frame (20); The second group of cross beam assemblies (32b) is used to be arranged before a first reference point (P1) and before the previous front cross beam (204) of the front row seats of the frame (20), and the first reference point (P1) is the orthographic projection of the hip of the front row passenger's sitting posture on the bottom shell (11); The third group of cross beam assemblies (32c) is used to be arranged between a second reference point (P2) and the subsequent front cross beam (204) of the front row seats of the frame; the second reference point (P2) is the orthographic projection of the hip of the rear row passenger's sitting posture on the bottom shell (11).

2. The battery pack housing (10) according to claim 1, characterized in that, Along the length direction of the electric vehicle, the cross beam bracket (321) has at least one bending structure (3211), and the bending structure (3211) protrudes in a direction away from the bottom shell (11).

3. The battery pack housing (10) according to claim 2, characterized in that, The bending structure (3211) has a support surface (M) parallel to the bottom shell, and the upper cover (2) is at least partially fixed to the support surface (M).

4. The battery pack housing (10) according to claim 3, characterized in that, Along the length direction of the electric vehicle, at least two bending structures (3211) are arranged at intervals, and the supporting surfaces (M) of the bending structures (3211) are coplanar.

5. The battery pack housing (10) according to claim 1, characterized in that, Along the width direction of the electric vehicle, the sizes of each crossbeam bracket (321) are the same.

6. The battery pack housing (10) according to claim 1, characterized in that, Along the length direction of the electric vehicle, the size of the crossbeam bracket (321) in the first group of crossbeam assemblies (32a) is larger than the size of the crossbeam bracket (321) in the second group of crossbeam assemblies (32b).

7. The battery pack housing (10) according to any one of claims 1-6, characterized in that, Along the length direction of the electric vehicle, the third group of crossbeam assemblies (32c) includes a plurality of crossbeam assemblies (32), and the plurality of crossbeam assemblies (32) are arranged adjacent to each other along the length direction of the electric vehicle.

8. A battery cell integrated vehicle body, characterized in that, The battery cell integrated body includes a vehicle frame (20), battery cells (30), and a battery pack box body (10) according to any one of claims 1-7; The vehicle frame (20) includes a front section (201), a rear section (202), and two sill beams (203) connected between the front section (201) and the rear section (202); the front section (201) and the rear section (202) are respectively fixed to both ends of the surrounding frame (12) along the length direction of the electric vehicle, and the two sill beams (203) are respectively fixed to both ends of the surrounding frame (12) along the width direction of the electric vehicle; the upper cover (2) forms at least a part of the floor of the vehicle frame (20), and the battery cells (30) are accommodated between the housing (1) and the upper cover (2).

9. An electric vehicle, characterized in that, It includes a battery cell integrated body according to claim 8.

Images