CN221316415U - New energy automobile structure with low cost, high endurance and high side collision safety - Google Patents

Abstract

The utility model relates to the technical field of side collision protection of a battery pack of a new energy automobile, in particular to a new energy automobile structural member with low cost, high endurance and high side collision safety. The solar cell comprises a cell tray, frame beams, supporting beams, a threshold inner plate and a threshold outer plate, and are all made of steel materials; the frame beams are fixedly connected to the vehicle body, the frame beams are positioned on two sides of the battery tray and connected with the battery tray, and the supporting cross beams are fixedly connected to the frame beams; the threshold inner plate is connected with the threshold outer plate, a closed box-shaped part is formed between the threshold inner plate and the threshold outer plate, more than 3M-shaped structural reinforcements are uniformly distributed between the threshold inner plate and the threshold outer plate, and the M-shaped structural reinforcements are made of ultra-high strength steel. The structure is simple, and the manufacturing cost is low; the light weight is realized, and the endurance and side collision safety are improved.

Description

New energy automobile structure with low cost, high endurance and high side collision safety

Technical Field

The utility model relates to the technical field of side collision protection of a battery pack of a new energy automobile, in particular to a new energy automobile structural member with low cost, high endurance and high side collision safety.

Background

The sales of new energy automobiles in China reach 688.7 thousands in 2022; from the sales volume, the new energy automobile sales of the last half year 2023 is respectively completed by 378.8 ten thousand and 374.7 ten thousand, and the production and sales are respectively increased by 42.4 percent and 44.1 percent in the same proportion. From the market share, the specific gravity of the new energy automobile sales volume accounting for the total automobile sales volume reaches 28.3 percent, which is nearly three times. With the continuous development of new energy automobiles, the requirements of users on the new energy automobiles are also increasing. The battery pack is used as a core component of the new energy automobile, is large in general design in order to ensure that the new energy automobile has enough cruising ability, and is positioned below the floor of the whole passenger cabin, and the safety of the battery pack directly influences the safety of drivers and passengers.

During running of the vehicle, the collision direction of the vehicle may be from front, back, left and right, and for the collision from front and back, parts such as a front bumper, an energy absorption box, a front longitudinal beam and the like are used for protecting a passenger cabin and a battery pack below the passenger cabin for the front collision from the direction of a vehicle head; for a collision from the rear, there are parts such as a rear bumper, an energy absorbing rear and a rear side member to protect a passenger compartment and a battery pack below. In addition, the front and rear parts have enough depth distances, so that the safety piece can absorb energy and resist invasion when the vehicle collides with the front part or the rear part, thereby protecting passengers and the battery pack from being damaged. However, for the collision from the side direction, since the battery pack is located close to the two sides, when the side collision occurs, the side invasive object easily contacts the battery pack body, so that the battery pack is damaged, and if serious, the battery cell is damaged, so that secondary injury is caused to the passengers.

Therefore, in the overall design of the lower vehicle body and the battery pack, it is necessary to pay attention to the safety performance of the battery pack under the side collision condition. For the battery pack, the side protection cell structure is a battery case-frame-threshold (the battery case mainly bears the effect of the cell, and the frame and the threshold are mainly designed to prevent invasion) from inside to outside. Therefore, the design of the frame and the door sill, and the profile structure is particularly important to improve the safety of the battery pack in a side collision. The threshold beam is an important component in the automobile body, and the strength and the energy absorption effect of the threshold beam directly influence the deformation condition of the passenger cabin during side collision of the automobile, so that the safety of the side collision of the automobile is influenced. Most of the existing threshold beams adopt welded steel stamping parts, and the threshold beam structure adopting the steel stamping parts has the defects of large number of parts, large overall weight, complex preparation process, high development cost, limited overall collapse energy absorption capacity and the like, so that the improvement of the usability of the threshold beam is limited.

The Chinese patent document with the publication number of CN111546868B discloses a vehicle structure for improving the side collision safety performance of a new energy electric vehicle, which can enlarge the arrangement space of a battery pack, effectively improve the endurance mileage of the new energy electric vehicle and avoid the extrusion of a battery pack module in a side collision accident. Although the structural design in the threshold area is proposed, the overall structure is complex, and the housing is an aluminum alloy, which is costly to manufacture. The Chinese patent document with the bulletin number of CN208306579U discloses a side collision structure of a vehicle body, but for the new energy vehicle shape, as a battery pack is required to be arranged below a floor, a cross beam is arranged below the floor, so that the space of the battery pack is easy to squeeze, and the continuous voyage mileage of the new energy vehicle type is not beneficial to improvement. The chinese patent publication No. CN214013051U discloses a "lower case assembly for power battery", which only plays a role in bottom impact protection, and does not effectively protect side column collision and frontal collision. Namely, the side column collision resistance and the frontal collision resistance of the lower box body of the power battery in the prior art are poor, the structural strength is weak, and a complementary structure cannot be formed with the design of a vehicle body.

In a word, the existing new energy automobile structural member has the following defects and disadvantages: 1. the structure is complex, the material is basically an aluminum alloy structure, and the manufacturing cost is high; 2. the matching of the battery pack and the position of the threshold beam is not considered, so that the continuous voyage mileage is not improved; 3. the side collision protection is not considered, the whole collapse energy absorption capability is insufficient, and the side collision safety is affected.

Disclosure of utility model

In order to overcome the defects of the prior art, the utility model provides a new energy automobile structural member with low cost, high endurance and high side collision safety. The structure is simple, and the manufacturing cost is low; the light weight is realized, and the endurance and side collision safety are improved.

In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:

The new energy automobile structural member with low cost, high endurance and high side collision safety comprises a battery tray, frame beams, supporting beams, a threshold inner plate and a threshold outer plate, and is made of steel materials. The material cost is low, and different parts adopt materials with different strength levels according to different stress conditions.

The frame beam is fixedly connected to the vehicle body, the frame beam is positioned on two sides of the battery tray and is connected with the battery tray, and the supporting cross beam is fixedly connected to the frame beam. The threshold inner plate is connected with the threshold outer plate, a closed box-shaped part is formed between the threshold inner plate and the threshold outer plate, more than 3M-shaped structural reinforcements are uniformly distributed between the threshold inner plate and the threshold outer plate, and the M-shaped structural reinforcements are made of ultra-high strength steel.

When the outer side of the threshold is impacted by the M-shaped structural reinforcement, the impact force can be uniformly transmitted to the outer plate of the threshold at the inner side.

Further, the number of the M-shaped structural reinforcements is 4-8, the M-shaped width is 6-10 cm, the thickness is 1.2-1.4 mm, and the length dimension is determined according to the size of the threshold beam.

Further, the ultra-high strength steel is hot forming steel with the strength level of more than 1000MPa, and the M-shaped structural reinforcement is prepared through hot forming.

The 1000MPa thermoforming material has good plasticity and toughness, so that brittle fracture can not occur when deformation and energy absorption are performed, and the M-shaped structural reinforcement member is subjected to plastic deformation, so that collision energy is absorbed.

Further, the ultra-high-strength steel is dual-phase steel with the strength level of more than 1000MPa, and the M-shaped structural reinforcement is manufactured by roll pressing.

The reason for selecting 1000MPa dual-phase steel is that the material has good toughness, so that brittle fracture can not occur when deformation and energy absorption are carried out. The M-shaped structural reinforcement is plastically deformed to absorb impact energy.

Further, the inner threshold plate and the outer threshold plate are both made of martensite steel or hot stamping forming steel with the pressure of more than 1500 MPa.

The purpose of selecting 1500MPa level martensitic steel or hot stamping steel is that after the shaping, part intensity is high, is difficult for taking place to warp during the collision, and the main objective is to ensure that when the side bump takes place, the threshold whole does not take place bending deformation as far as possible, but whole even inward deformation, can make the external force when the collision evenly distributed along the threshold direction like this, and can furthest pass through 4 ~ 8M shape structural reinforcement absorption energy between threshold inner panel and the threshold planking between the overall arrangement.

Further, the frame beam is located between the battery tray and the threshold inner plate, the cross section of the frame beam is in a Chinese character 'ri', both sides of the frame beam are made of ultra-high strength steel, and the forming mode is rolling.

The frame beam has the following functions: a, supporting a battery pack; and b, resisting external impact and protecting the battery pack.

Further, the frame beam is soft and hard in section, the side close to the battery is a hard area, and the other side is a soft area.

The soft and hard partition is realized on the section, the side close to the battery is a hard region, and the other side is a soft region, so that the energy absorption and the invasion resistance are extremely good.

Further, one side, close to the battery, of the frame beam is made of martensite steel with the pressure of more than 1500MPa, and the other side is made of complex phase steel with the pressure of more than 1000 MPa; the forming process comprises the following steps: in the flat plate state, the two materials are subjected to splice welding according to requirements, and after welding, the two materials are subjected to roll forming, and the length of the final part is determined according to the size of the battery pack.

Further, the supporting beam is made of 1500 MPa-level hot forming steel or martensitic steel, the section of the supporting beam is shaped like a Chinese character 'kou', and the forming mode is rolling.

The supporting beam is a part connected with the left side and the right side of the battery pack, mainly plays a supporting role, plays a role in transferring force during collision, adopts 1500 MPa-level hot forming steel or martensitic steel as the part, ensures that the end part of the supporting beam cannot be deformed easily when being stressed, and transmits external force to the other side of the battery pack.

Further, the supporting cross beam is connected with the frame beam through a reinforcing piece.

Compared with the prior art, the method has the beneficial effects that:

1. the utility model is made of steel materials, so that the production and manufacturing cost is reduced; the more than 3M-shaped structural reinforcements are uniformly distributed between the threshold inner plate and the threshold outer plate, and are made of ultra-high strength steel, so that the weight reduction is realized, and the endurance and side collision safety are improved.

In the limited space, reasonable material selection and structural design are utilized, the overall structural strength of the battery pack is improved, the energy generated during collision is absorbed, the external invasion amount during collision is realized, and the battery module is protected.

2. The utility model realizes soft and hard partition on the same frame beam part, especially on the section, the side close to the battery is a hard region, and the other side is a soft region, so that the energy absorption and the intrusion resistance are extremely good.

3. Through the material selection and structural design of the threshold, namely the inner plate of the threshold beam reinforcing plate and the threshold reinforcing plate are made of 1500 MPa-level ultrahigh-strength hot forming steel or martensitic steel, 4-8M-shaped structural reinforcements are uniformly distributed between the inner plate and the threshold beam reinforcing plate, and the M-shaped structural reinforcements are made of 1000 MPa-level hot forming steel or dual-phase steel with good toughness, so that the combination of energy absorption and intrusion resistance is realized.

4. The M-shaped structural reinforcement is made of hot forming steel with the strength level of more than 1000MPa, and is manufactured through hot forming. The 1000MPa thermoforming material has good plasticity and toughness, so that brittle fracture can not occur when deformation and energy absorption are performed, and the M-shaped structural reinforcement member is subjected to plastic deformation, so that collision energy is absorbed.

5. The M-shaped structural reinforcement is made of dual-phase steel with the strength level of more than 1000MPa, and is manufactured through roller pressing. The reason for selecting 1000MPa dual-phase steel is that the material has good toughness, so that brittle fracture can not occur when deformation and energy absorption are carried out. The M-shaped structural reinforcement is plastically deformed to absorb impact energy.

6. The inner plate and the outer plate of the threshold are made of martensite steel or hot stamping steel with the pressure of more than 1500 MPa. The purpose of selecting 1500MPa level martensitic steel or hot stamping steel is that after the shaping, part intensity is high, is difficult for taking place to warp during the collision, and the main objective is to ensure that when the side bump takes place, the threshold whole does not take place bending deformation as far as possible, but whole even inward deformation, can make the external force when the collision evenly distributed along the threshold direction like this, and can furthest pass through 4 ~ 8M shape structural reinforcement absorption energy between threshold inner panel and the threshold planking between the overall arrangement.

7. The supporting beam is a part connected with the left side and the right side of the battery pack, mainly plays a supporting role, plays a role in transferring force during collision, adopts 1500 MPa-level hot forming steel or martensitic steel as the part, ensures that the end part of the supporting beam cannot be deformed easily when being stressed, and transmits external force to the other side of the battery pack.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

Fig. 2 is a schematic view of the frame beam structure of the present utility model.

Fig. 3 is a schematic view of the structure of the supporting beam of the present utility model.

FIG. 4 is a schematic view of the structure of the rocker inner panel, rocker outer panel and M-shaped structural reinforcement of the present utility model.

Fig. 5 is a schematic view of the structure of the M-shaped structural reinforcement of the present utility model.

In the figure: 1-cell tray 2-frame beam 3-support beam 4-threshold inner plate 5-threshold outer plate

6-M structural reinforcement 7-connection point 8-hard zone 9-soft zone

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

The following detailed description of the utility model is further illustrative, but is not intended to limit the scope of the utility model:

[ example ]

Example 1:

as shown in fig. 1 to 5, the new energy automobile structural member with low cost, high endurance and high side collision safety comprises a battery tray 1, a frame beam 2, a supporting cross beam 3, a threshold inner plate 4 and a threshold outer plate 5. The structural material is all steel material, and the material cost is low; according to different stress conditions, different parts adopt materials with different strength levels.

The battery tray 1 is horizontally arranged transversely, the battery is placed on the battery tray 1, and two frame beams 2 are positioned on the left side and the right side of the battery tray 1. The support beam 3 transversely sets up, supports battery tray 1, and support beam 3 fixed connection is on frame roof beam 2, and frame roof beam 2 and automobile body fixed connection, battery tray 1 and frame roof beam 2 bolted connection.

The inner rocker panel 4 and the outer rocker panel 5 are welded together by spot welding to form a closed box-shaped member. Before the two are welded, M-shaped structural reinforcements 6 are connected to the threshold inner plate 4 at equal intervals, the number of the M-shaped structural reinforcements 6 is 4 according to the size requirement of a vehicle model, the M-shaped structural reinforcements 6 are finished through bending or thermoforming, and the specific forming mode is determined according to materials.

The M-shape of the M-shaped structural reinforcement 6 has a width of 8cm and a thickness of 1.2mm, and the length dimension is determined according to the size of the rocker, and three connection points 7 of the M-shaped structural reinforcement 6 are connected to the rocker inner panel 4 as shown in fig. 5. The connection points on the two sides are preferably spot-welded, the middle is glued, and the fact that the welding gun with too high diameter depth is difficult to enter the middle connection point is mainly considered. The structural reinforcement plays a role in reinforcement, enhances the anti-collision capacity of the car body threshold beam, reduces deformation of the car body threshold beam during collision, and improves the passive safety performance of the car.

The material selected for the M-shaped structural reinforcement 6 is ultra-high strength steel. The dual-phase steel with the strength grade of 1000MPa is adopted, the part is obtained by rolling (the reason that the dual-phase steel with the strength grade of 1000MPa is adopted is that the material has good toughness, so that brittle fracture cannot occur during deformation energy absorption), and the M-shaped structural reinforcement 6 is subjected to plastic deformation, so that collision energy is absorbed.

The inner threshold plate 4 and the outer threshold plate 5 are made of 1500MPa martensitic steel or hot stamping steel, after the purpose of forming is to select 1500MPa martensitic steel or hot stamping steel, the strength of the part is high, deformation is not easy to occur during collision, the main purpose is to ensure that the whole threshold is not bent and deformed as much as possible when side collision occurs, but is uniformly deformed inwards, so that external force during collision is uniformly distributed along the threshold direction, and energy can be absorbed to the greatest extent through a plurality of M-shaped structural reinforcements 6 distributed between the inner threshold plate 4 and the outer threshold plate 5.

The left and right frame beams 2 are arranged between the battery tray 1 and the threshold inner plate 4, and the left and right frame beams 2 have the following functions: a, supporting a battery pack; and b, resisting external impact and protecting the battery pack. The cross sections of the left frame beam 2 and the right frame beam 2 are in a Chinese character 'ri', the two sides of the Chinese character 'ri' shaped frame beams are made of ultra-high strength steel, and the forming mode is rolling.

Preferably, the side close to the battery is 1500MPa martensitic steel, and the other side is 1000MPa complex phase steel (in the forming process, in a flat plate state, two materials are subjected to welding according to requirements, and then are subjected to roll forming after welding, so that a final part is obtained, the length of the final part is determined according to the size of a battery pack.

The supporting beam 3 is a part for connecting the left side and the right side of the battery pack, mainly plays a supporting role, plays a role in transferring force during collision, adopts 1500 MPa-level hot forming steel or martensitic steel as the part, ensures that the end part of the supporting beam 3 cannot be deformed easily when being stressed, and transmits external force to the other side of the battery pack. The cross section of the supporting beam 3 is shaped like a Chinese character kou, and the forming mode is rolling.

The supporting cross beam 3 is connected with the left frame beam 2 and the right frame beam 2 through a reinforcing piece.

Example 2:

Other structures of the embodiment are the same as those of the embodiment 1, the M-shaped structural reinforcement 6 is made of hot forming steel with the strength level of 1000MPa, the part is obtained through hot forming, and the hot forming material with the strength of 1000MPa has good plasticity, so that brittle fracture can not occur when deformation and energy absorption are carried out, and the M-shaped structural reinforcement 6 is plastically deformed, so that collision energy is absorbed. The M-shaped structural reinforcements 6 are firstly connected to the threshold inner plate 4 at equal intervals, and the number of the M-shaped structural reinforcements is 6 according to the size requirement of a vehicle model.

In the embodiment, the M-shaped structural reinforcement 6 is attached to the rocker inner panel 4, the term attachment being used herein to denote preferably welding, but not limited to welding, but may also be attached by means of adhesive, snap-fit or the like, or integrally joined.

In the limited space, the utility model improves the integral structural strength of the battery pack by utilizing reasonable material selection and structural design, realizes the absorption of energy generated during collision and realizes the external invasion amount during collision, thereby protecting the battery module. Soft and hard partitions are realized on the same frame beam part, particularly on the section, the side close to the battery is a hard region, and the other side is a soft region, so that the energy absorption and the intrusion resistance are extremely good; through the material selection and structural design of the threshold, namely the inner plate of the threshold beam reinforcing plate and the threshold reinforcing plate are made of 1500 MPa-level ultrahigh-strength hot forming steel or martensitic steel, 4-8M-shaped reinforcing structures are uniformly distributed between the inner plate and the threshold beam reinforcing plate, and the M-shaped reinforcing structures are made of 1000 MPa-level hot forming steel or dual-phase steel with good toughness, so that the combination of energy absorption and intrusion resistance is realized.

The utility model has simple structure and low manufacturing cost; the device realizes light weight, improves the crumple energy absorption capability during side collision, and improves the endurance capability and the side collision safety.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims (9)

1. New energy automobile structure that low cost, high duration, side bump security are high, its characterized in that:

The solar cell comprises a cell tray, frame beams, supporting beams, a threshold inner plate and a threshold outer plate, and are all made of steel materials;

the frame beams are fixedly connected to the vehicle body, the frame beams are positioned on two sides of the battery tray and connected with the battery tray, and the supporting cross beams are fixedly connected to the frame beams;

the threshold inner plate is connected with the threshold outer plate, a closed box-shaped part is formed between the threshold inner plate and the threshold outer plate, more than 3M-shaped structural reinforcements are uniformly distributed between the threshold inner plate and the threshold outer plate, and the M-shaped structural reinforcements are made of ultra-high strength steel.

2. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

The number of the M-shaped structural reinforcing pieces is 4-8, the width is 6-10 cm, and the thickness is 1.2-1.4 mm.

3. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

the ultra-high strength steel is hot forming steel with the strength grade of more than 1000 MPa.

4. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

The ultra-high strength steel is dual-phase steel with the strength level of more than 1000 MPa.

5. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

the inner and outer threshold plates are made of martensite steel or hot stamping steel with the pressure of more than 1500 MPa.

6. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

The frame beam is located between the battery tray and the threshold inner plate, the cross section of the frame beam is in a Chinese character 'ri', and both side edges of the frame beam are made of ultra-high strength steel.

7. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 6, wherein:

The side, close to the battery, of the frame Liang Ruan is a hard zone, and the other side is a soft zone;

The side of the frame beam, which is close to the battery, is made of martensite steel with the pressure of more than 1500MPa, and the other side of the frame beam is made of complex phase steel with the pressure of more than 1000 MPa.

8. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

The supporting beam is made of 1500 MPa-level hot forming steel or martensitic steel, and the section of the supporting beam is in a shape of a Chinese character kou.

9. The low-cost, high-endurance, high-side impact safety new energy automobile structure of claim 1, wherein:

the supporting cross beam is connected with the frame beam through a reinforcing piece.