Battery edge covering beam structure

Abstract

The utility model provides a battery edge covering beam structure which is provided with a beam main body, the beam main body is formed by bending and rolling a single plate according to a specified shape, and the beam main body is provided with a double-layer plate structure due to the roundabout closed-loop arrangement of the plate. The utility model has the effects of improving the integrity and impact resistance of the boundary beam, further enhancing the use stability of a battery pack and improving the use quality of a vehicle.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a battery pack side beam structure. Background Art

[0002] With the development of science and technology and the enhancement of environmental awareness, major automobile manufacturers have shifted their focus to new energy vehicles. Pure electric vehicles, as new energy vehicles, are increasingly favored by all sectors of society, and the use of new energy vehicles has increased significantly. As the core component of new energy vehicles, the stability of the battery pack directly affects the performance of the vehicle. The battery pack includes a battery pack housing and a battery module, a high-voltage electrical system, and a thermal management system arranged in the battery pack housing; and the battery pack housing is composed of side beams, cover plates, water cooling plates, protective plates, etc.

[0003] In the related art, the side beams of the battery pack shell are mostly formed by welding aluminum profiles. The integrity of the side beams is destroyed after multiple welding, and the yield strength of the aluminum profiles is low. When the battery pack is subjected to external forces, the side beams are easily collapsed into the battery pack, causing damage to the battery pack. Utility Model Content

[0004] In view of this, the utility model aims to propose a battery pack side beam structure to improve the integrity and impact resistance of the side beam, thereby enhancing the use stability of the battery pack and improving the use quality of the vehicle.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery edge beam structure, comprising a beam body;

[0007] The beam body is formed by bending and rolling a single plate in a specified shape, and the beam body has a double-layer plate structure due to the circuitous closed loop arrangement of the plate.

[0008] Further, the beam body is constructed in an L-shape.

[0009] Furthermore, two first cavities are formed on the vertical section of the beam body and are adjacent to each other up and down.

[0010] Furthermore, the lengths of the two first cavities are not less than 20 mm.

[0011] Furthermore, the height of the two first cavities is greater than 10 mm.

[0012] Furthermore, the head end and the tail end of the plate are located in the same first cavity.

[0013] Furthermore, the head end of the plate forms a fitting portion that is welded to the plate, and the length of the fitting portion is not less than 5 mm.

[0014] Furthermore, the horizontal section of the beam body has a closed section formed by the circuitous bonding of the plate, and both ends of the closed section are respectively connected with the second cavity.

[0015] Furthermore, the length of the closed section is not less than 5 mm.

[0016] Furthermore, the radius of the rolling angle on the bending and circuitous path of the plate is not less than the thickness of the plate.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The battery pack side beam structure described in the utility model is a beam body arranged in a circuitous closed loop formed by rolling a single plate, which has better integrity than the side beam formed by welding aluminum profiles; at the same time, the double-layer plate structure formed by the circuitous closed loop improves the strength and impact resistance of the side beam; since the space formed by the circuitous closed loop rolling forms a collapse energy absorption space, when the battery pack is subjected to external impact, the collapse energy absorption space collapses after absorbing energy, thereby reducing the external impact transmitted to the inside of the battery pack, thereby enhancing the stability of the battery pack and improving the quality of vehicle use.

[0019] Secondly, the beam body is constructed in an L-shape. The two first cavities formed on the vertical section of the beam body can withstand the impact when the battery pack is subjected to external impact, thereby avoiding loosening or rupture of the battery pack structure due to insufficient strength, thereby improving the safety of the battery pack.

[0020] In addition, after a single sheet of plate is rolled and wound, one end is fixedly connected to the sheet to form the first first cavity, and then, the sheet is bent according to a specified shape and rolled, and the other end is fixedly connected to the sheet to form a second cavity, thereby forming two first cavities formed on the vertical section of the beam body; the lengths of the two first cavities are not less than 20 mm, which can avoid tearing at the connection of the first cavity due to the short cavity length when the second first cavity is formed; at the same time, it can reduce the rebound force caused by the bending angle of the sheet, the thickness of the sheet or the hardness of the material that needs to be overcome when the second first cavity is fixed, thereby improving the strength of the beam body.

[0021] By setting the height of the first cavity to be greater than 10 mm, the risk of the roller being too thin and easy to break due to the first cavity being too small can be reduced. At the same time, setting the height of the first cavity in this way can reduce the number of empty bends in the beam body.

[0022] By setting the length of the fitting portion to be no less than 5 mm, the connection strength between the fitting portion and the plate and the yield rate of the beam body are guaranteed, and the rebound force caused by the plate bending angle, plate thickness or material hardness that needs to be overcome when the first cavity is fixed is better overcome.

[0023] By setting a closed section, the connection strength between the double-layer plates after the horizontal section of the beam body is formed is improved, and the strength of the second cavity is connected, thereby improving the anti-shrinkage ability of the second cavity; the length of the closed section is not less than 5mm to achieve the effectiveness of the connection between the closed section and the plate, and at the same time, it can avoid the closed section becoming arc-shaped due to the inability to overcome the rebound force caused by the closed section being too short.

[0024] By setting the rolling angle radius on the bending and circuitous path of the plate to be no less than the thickness of the plate, it is avoided that the bending is too small and causes cracks, peeling or distortion on the outer surface of the plate, and the stress concentration of the plate exceeding the bearing limit when the plate is impacted and the resulting fracture is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0026] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0027] Description of reference numerals: 1. beam body;

[0028] 101, vertical section; 102, horizontal section; 103, closed section;

[0029] 2. Board material;

[0030] 201, laminating portion; 202, transition portion;

[0031] 3. The first cavity;

[0032] 4. Second cavity;

[0033] a, height of the first cavity; b, length of the first cavity; R, rolling angle radius. DETAILED DESCRIPTION

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0035] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] The present embodiment relates to a battery pack side beam structure to improve the integrity and impact resistance of the side beam, thereby enhancing the use stability of the battery pack and improving the use quality of the vehicle.

[0039] The entire embodiment relates to a battery pack side beam structure to improve the integrity and impact resistance of the side beam, thereby enhancing the stability of the battery pack and improving the quality of vehicle use.

[0040] In terms of overall structure, the battery edge beam structure has a beam body 1, which is formed by bending and rolling a single plate 2 into a specified shape, and the beam body 1 has a double-layer plate 2 structure due to the circuitous closed loop setting of the plate 2.

[0041] As arranged above, the battery pack side beam structure of this embodiment, the beam body 1 arranged in a circuitous closed loop formed by rolling a single plate 2, has better integrity than the side beam formed by welding aluminum profiles; at the same time, the double-layer plate 2 structure formed by the circuitous closed loop improves the strength and impact resistance of the side beam; the space formed by the circuitous closed loop rolling forms a collapse energy absorption space, and when the battery pack is subjected to external impact, the collapse energy absorption space collapses after absorbing energy, providing deformation space for the external impact, and reducing the transmission of the external impact to the inside of the battery pack, thereby enhancing the stability of the battery pack and improving the quality of vehicle use.

[0042] Based on the overall introduction above, the battery pack side beam structure described in this embodiment, as shown in 1, is made of a material with high tensile strength and hardness, such as a steel plate. Compared with aluminum, steel has higher structural strength, higher melting point and lower material cost. Through the improvement of materials and structures, the overall strength and rigidity of the beam body 1 are improved, and compared with the welded side beam, the beam body 1 set in this way is easier to process, reduces construction steps and reduces production costs.

[0043] The beam body 1 is manufactured by rolling, which has the advantages of less welding area, stable output of side beams and improved air tightness of the product after molding.

[0044] In order to further increase the impact resistance of the beam body 1, the beam body 1 is constructed in an L shape, and the L-shaped beam body 1 can be divided into a vertical section 101 and a horizontal section 102 according to the shape; two first cavities 3 are formed on the vertical section 101 of the beam body 1, which are adjacent to each other up and down. The beam body 1 is constructed in an L shape, and the two first cavities 3 formed on the vertical section 101 of the beam body 1 are configured in this way. When the battery pack is subjected to external impact, the first cavity 3 can withstand the impact. When the impact force is too large, the first cavity 3 collapses to provide deformation space for the impact, and the vertical section 101 is set to avoid the loosening or rupture of the battery pack structure caused by insufficient strength, thereby improving the safety of the battery pack.

[0045] When the beam body 1 is formed, the head end of a single sheet 2 is fixedly connected to the sheet 2 after being rolled and detoured to form the first first cavity 3, the other end of the sheet 2 is first left blank along the length b direction of the first cavity 3, then bent to the side away from the first cavity 3 and folded back to form a horizontal section 102, the tail end of the sheet 2 is fixedly connected to the sheet 2 surrounding the first cavity 3, and then the second first cavity 3 is formed, and the vertical section 101 of the beam body 1 is formed. The above beam body 1 forming process is completed by bending at small angles multiple times, and then the head and tail ends of the sheet 2 are welded in sequence after gradually forming.

[0046] When the head and tail ends of the plate 2 are fixedly connected to the plate 2, it is only necessary to ensure the connection strength of the first cavity 3 after the connection; for example, the fixing method can be riveting or welding. In this embodiment, in order to improve the connection strength between the head and tail ends of the plate 2 and the plate 2 and increase the connection points between the head and tail ends of the plate 2 and the plate 2, welding is selected as the fixing method; specifically, laser welding is selected. Laser welding is a method of welding that uses a focused laser beam as an energy source to bombard the weldment with heat generated. Laser welding also has the characteristics of low heat input, small welding deformation, and no influence of electromagnetic fields.

[0047] In order to ensure the strength of the first cavity 3 after forming, the length b of the two first cavities 3 is not less than 20 mm. The first first cavity 3 is formed by rolling a single plate 2 and then fixing the first end to the plate 2. Then, the plate 2 is bent into a specified shape and rolled and fixedly connected to the plate 2 at the other end to form a second cavity 4, so as to form two first cavities 3 formed on the vertical section 101 of the beam body 1. The length b of the two first cavities 3 is not less than 20 mm, which can avoid tearing at the connection of the first first cavity 3 due to the short length of the first cavity 3 when the second first cavity 3 is formed. At the same time, it can reduce the rebound force caused by the bending angle of the plate 2, the thickness of the plate 2 or the hardness of the material that needs to be overcome when the second first cavity 3 is fixed, thereby improving the strength of the beam body 1.

[0048] In order to facilitate the roll forming of the beam body 1, the height a of the two first cavities 3 is greater than 10mm. By setting the height a of the first cavity 3 to be greater than 10mm, the easy breakage of the supporting roller caused by the thickness of the supporting roller required for production being too thin due to the small height a of the first cavity 3 can be reduced. At the same time, setting the height a of the first cavity 3 in this way can reduce the number of empty bends of the beam body 1. Specifically, the height a of the first cavity 3 also depends on the tensile strength of the plate 2. For reference, when the tensile strength of the plate 2 is less than 600Mpa, the height a of the first cavity 3 is not less than 10mm; when the tensile strength of the plate 2 is between 600Mpa and 800Mpa, the height a of the first cavity 3 is not less than 12mm; when the tensile strength of the plate 2 is between 1200Mpa, the height a of the first cavity 3 is not less than 15mm. Plates 2 with different tensile strengths are matched with first cavities 3 with different heights, so that the first cavity 3 has more suitable impact strength and different collapse spaces.

[0049] In order to make the battery pack equipped with the side beam have better safety in the event of a collision, the head and tail ends of the plate 2 are located in the same first cavity 3; by surrounding the head and tail ends in the first cavity 3, the ends of the plate 2 surrounding the first cavity 3 are blocked; compared with the head and tail ends being located outside the first cavity 3, it can effectively prevent the two ends of the plate 2 from piercing into the interior of the battery pack when the battery pack is impacted by the outside and the first cavity 3 collapses, thereby improving the safety and stability of the battery pack.

[0050] In order to ensure the connection strength of the first cavity 3 and the yield rate of the beam body 1, the head end of the plate 2 forms a fitting portion 201 that is welded to the plate 2, and the length of the fitting portion 201 is not less than 5 mm. By setting the length of the fitting portion 201 to be not less than 5 mm, the rebound force generated by the bending angle of the plate 2, the thickness of the plate 2 or the hardness of the material that needs to be overcome when the first cavity 3 is fixed is better overcome; the connection strength between the fitting portion 201 and the plate 2 and the yield rate of the beam body 1 are ensured.

[0051] In order to improve the strength of the corresponding plate 2 surrounding the horizontal section 102 of the beam body 1, the horizontal section 102 of the beam body 1 has a closed section 103 formed by the circuitous bonding of the plate 2, and the two ends of the closed section 103 are respectively connected with the second cavity 4. By providing the closed section 103, the connection strength between the double-layer plate 2 after the horizontal section 102 of the beam body 1 is improved, and the strength of the connected second cavity 4 is improved, and the anti-collapse ability of the second cavity 4 is improved.

[0052] The closed section 103 is formed by bending one of the two parallel sections of the plate 2 that surround the horizontal section 102 of the beam body 1 to extend toward the other section of the unbent plate 2 to form an inclined transition section 202. The transition section 202 abuts against the unbent plate 2 and extends in close contact with the plate 2, then bends downward to form another transition section 202, and then extends after being adjusted to be parallel to the unbent plate body to complete the formation of the closed section 103. The inclined transition section 202 makes the horizontal section 102 of the beam body 1 have better impact resistance, and the inclined transition section 202, compared with the transition section 202 perpendicular to the horizontal section 102 of the beam body 1, can prevent metal fatigue caused by the bending transition of the plate 2.

[0053] In order to improve the connection stability of the closed section 103 and avoid the plate 2 becoming an arc-shaped plate due to the plate 2 surrounding the horizontal section 102 being too long during the molding of the first cavity 3; the length of the closed section 103 is not less than 5mm to achieve the effectiveness of the connection between the closed section 103 and the plate 2, and at the same time avoid the closed section 103 being unable to overcome the rebound force due to being too short, causing the section to become an arc.

[0054] In order to ensure the strength of the plate 2 after it is bent, the rolling angle radius R on the bending and circuitous path of the plate 2 is not less than the thickness of the plate 2. By setting the rolling angle radius R on the bending and circuitous path of the plate 2 to be not less than the thickness of the plate 2, it is possible to avoid cracks, peeling or distortion on the outer surface of the plate 2 due to excessive bending, and to reduce the stress concentration that exceeds the bearing limit of the plate 2 when the plate 2 is impacted and cause fracture. The thickness of plate 2 is set to a standard amount of 1t, and different rolling angle radii R correspond to different tensile strengths of the steel plate. For specific reference, when the tensile strength of the steel plate is less than 400Mpa, the rolling angle radius R is 1t, that is, the rolling angle radius R is the same as the thickness of plate 2; when the tensile strength of plate 2 is between 400Mpa and 600Mpa, the rolling angle radius R is 1.2t; when the tensile strength of plate 2 is between 600Mpa and 800Mpa, the rolling angle radius R is 1.5t; when the tensile strength of plate 2 is between 800Mpa and 1000Mpa, the rolling angle radius R is 2t; when the tensile strength of plate 2 is between 1000Mpa and 1200Mpa, the rolling angle radius R is 3t; the rolling angle radius R set in this way reduces the possibility of cracks, peeling or distortion on the outer surface of plate 2 due to too small bending.

[0055] When the utility model battery pack side beam structure is formed, a steel plate with a specific tensile strength is first selected as the plate. The beam body 1 formed by rolling a single plate 2 in a circuitous closed loop has better integrity than the side beam formed by welding aluminum profiles. At the same time, the double-layer plate 2 structure formed by the circuitous closed loop improves the strength and impact resistance of the side beam. The space formed by the circuitous closed loop rolling forms a collapse energy absorption space. When the battery pack is impacted by the outside world, the collapse energy absorption space collapses after absorbing energy, providing a deformation space for the external impact, and reducing the transmission of the external impact to the inside of the battery pack, thereby enhancing the stability of the battery pack and improving the quality of the vehicle. Compared with the use of aluminum, steel has higher structural strength, higher melting point and lower material cost. Through the improvement of materials and structures, the overall strength and rigidity of the beam body 1 are improved, and compared with the side beam formed by welding, the beam body 1 set in this way is easier to process, reduces construction steps and reduces production costs.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery side beam structure, having a beam body, characterized in that: The beam body is formed by bending and rolling a single sheet of plate into a specified shape, and the beam body has a double-layer plate structure due to the circuitous closed loop arrangement of the plate; The beam body is configured in an L shape; Two first cavities are formed on the vertical section of the beam body and are adjacent to each other up and down.

2. The battery pack side beam structure according to claim 1, characterized in that: The length of the two first cavities is not less than 20 mm.

3. The battery pack side beam structure according to claim 1, characterized in that: The height of the two first cavities is greater than 10 mm.

4. The battery pack side beam structure according to claim 1, characterized in that: The head end and the tail end of the plate are located in the same first cavity.

5. The battery pack side beam structure according to claim 4, characterized in that: The head end of the plate forms a fitting portion which is welded to the plate, and the length of the fitting portion is not less than 5 mm.

6. The battery pack side beam structure according to claim 1, characterized in that: The horizontal section of the beam body is provided with a closed section formed by the circuitous bonding of the plate, and the two ends of the closed section are respectively connected with the second cavity.

7. The battery pack side beam structure according to claim 6, characterized in that: The length of the closed section is not less than 5 mm.

8. The battery pack side beam structure according to any one of claims 1 to 7, characterized in that: The rolling angle radius on the bending and circuitous path of the plate is not less than the thickness of the plate.

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