Battery wrapping edge beam structure and battery pack

Abstract

The utility model provides a battery hemming beam structure and battery pack, the battery hemming beam structure of this embodiment comprises a beam body formed by a steel plate through integral rolling, the beam body comprises a first side wall and a second side wall which are arranged oppositely, the second side wall comprises a first wall body connected with the top of the first side wall through a top wall, and a second wall body connected with the top of the second side wall through a bottom wall; the second wall body is connected with the bottom of the first side wall through the bottom wall, a cavity is defined by the first side wall, the second side wall, the top wall and the bottom wall, and the free end of the first wall body is connected with a bent arm located in the cavity. According to the battery wrapping edge beam structure disclosed by the utility model, the beam body is formed by integrally rolling and forming the steel plate, and the bending arms are arranged between the second wall body and the first side wall in the roundabout manner, so that the cavity in the beam body is divided into a plurality of sub-cavities, the structural strength of the edge beam is favorably improved, and the safety performance of a battery pack is favorably improved.

Description

Technical Field

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

[0002] The battery pack side beam is an important component of the battery pack, and its structural strength determines the safety performance of the battery pack. Due to the material properties of aluminum alloys, which are light in weight, they are widely used in the manufacture of battery pack side beams. Common battery pack side beam structures are mostly made by welding aluminum alloy profiles, casting aluminum alloys and other methods. However, due to the material properties of aluminum alloys, its strength is also relatively low, which makes it difficult to meet the needs of the evolving new energy vehicles for the structural performance of the battery pack side beams. In order to improve the strength of the side beam structure, the conventional technical means is to increase the thickness of the side beam, but this will lead to an increase in the weight of the battery pack and increase the space occupied, which is not conducive to the performance of the battery pack. Utility Model Content

[0003] In view of this, the utility model aims to propose a battery pack side beam structure to enhance the structural strength of the side beam, thereby facilitating improving the safety of the battery pack.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A battery pack side beam structure, comprising a beam body integrally roll-formed from a steel plate, the beam body comprising a first side wall and a second side wall arranged opposite to each other, the second side wall comprising a first wall body connected to the top of the first side wall through a top wall, and a second wall body connected to the bottom of the first side wall through a bottom wall, and a cavity is formed between the first side wall, the second side wall, the top wall and the bottom wall;

[0006] The free end of the first wall is connected to a bending arm located in the cavity. The bending arm is arranged between the second side wall and the first side wall and is connected to the second wall and the first side wall. The bending arm divides the cavity into a plurality of sub-cavities arranged at intervals in the upper and lower parts.

[0007] Furthermore, the bending arm has a middle portion connected to the first side wall, a first portion connected between the top of the middle portion and the free end of the first wall, and a second portion connected between the bottom of the middle portion and the second wall.

[0008] Furthermore, the distance between the first part and the second part is gradually increased in a direction away from the middle part.

[0009] Furthermore, the top of the second wall body is provided with an upper flange folded into the cavity, and the second wall body is connected to the first part through the upper flange; and / or, the bottom of the second part is provided with a lower flange folded downward, and the second part is connected to the second wall body through the lower flange.

[0010] Furthermore, an overlapping length L1 between the upper flange and the first portion satisfies: L1 ≥ 5 mm; and / or an overlapping length L2 between the lower flange and the second wall body satisfies: L2 ≥ 5 mm.

[0011] Furthermore, the angle β between the upper flange and the second wall satisfies: 40°≤β≤50°; and / or the bending radius R between the upper flange and the second wall satisfies: R≥3mm.

[0012] Furthermore, an angle α between at least one of the first part and the second part and the middle part satisfies: 130°≤α≤140°.

[0013] Further, the width A of the beam body and the height B of the beam body satisfy: A≥25mm, B≥2A; and / or, the relationship between the height L3 of the middle portion and the height B of the beam body satisfies: L3≥0.2*B.

[0014] Furthermore, the bending arm is connected to the second wall and the first side wall by welding.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The battery pack side beam structure described in the utility model is formed by integrally roll-forming a beam body from a steel plate, and by arranging a bending arm between the second wall body and the first side wall, the cavity in the beam body is divided into a plurality of sub-cavities, which is beneficial to improving the structural performance of the side beam, thereby helping to improve the safety performance of the battery pack. Compared with the solution of increasing the thickness of the traditional aluminum side beam, it is beneficial to reduce the space occupied and contribute to the lightweight of the battery pack.

[0017] In addition, the bending arm is connected to the second wall and the first side wall, which can improve the connection strength between the first side wall and the second side wall, thereby further improving the structural performance of the side beam. In addition, the spacing between the first part and the second part of the bending arm is gradually increased in the direction away from the middle part, so that the first part and the second part constitute a support for the middle part, and when the side beam is impacted by external force, the first part and the second part of the bending arm can be used as reinforcing ribs to help the first side wall resist the impact of the external force, thereby helping to further improve the structural strength of the side beam.

[0018] In addition, an upper flange is provided on the top of the second wall body, which is connected to the first part, and the overlapping length L1 of the upper flange and the first part is ≥5mm, and a lower flange is provided on the bottom of the second part, which is connected to the second wall body, and the overlapping length L2 of the lower flange and the second wall body is ≥5mm, which is beneficial to ensure the connection strength between the upper flange and the first part and between the lower flange and the second wall body, thereby ensuring the overall structural stability of the beam body.

[0019] In addition, another object of the present invention is to provide a battery pack, which includes a lower shell, and the above-mentioned battery pack side beam structure is provided on the circumference of the lower shell.

[0020] The battery pack described in the utility model has the technical advantages possessed by the above-mentioned battery pack side beam structure by providing the above-mentioned battery pack side beam structure, and can improve the structural strength of the battery pack, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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:

[0022] Figure 1 It is a cross-sectional schematic diagram of the battery side beam structure according to an embodiment of the utility model;

[0023] Figure 2 For the utility model Figure 1 Schematic diagram of the local structure at the position shown by C.

[0024] Description of reference numerals:

[0025] 1. First side wall; 2. Second side wall;

[0026] 21. first wall; 22. second wall;

[0027] 211, middle part; 212, first part; 213, second part; 214, lower flange;

[0028] 221. Turn up the edge. DETAILED DESCRIPTION

[0029] 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.

[0030] In the description of the present invention, it should be noted that if there are terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc., 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", "second", etc., they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0032] Embodiment 1

[0033] The present embodiment relates to a battery pack side beam structure, which serves as a part of a lower shell of the battery pack and is used to improve the safety performance of the battery pack.

[0034] In terms of overall structure, Figure 1 As shown, the battery pack side beam structure of this embodiment includes a beam body integrally roll-formed from a steel plate, the beam body includes a first side wall 1 and a second side wall 2 arranged opposite to each other, the second side wall 2 includes a first wall body 21 connected to the top of the first side wall 1 through a top wall, and a second wall body 22 connected to the bottom of the first side wall 1 through a bottom wall, and a cavity is formed between the first side wall 1, the second side wall 2, the top wall and the bottom wall.

[0035] Among them, the free end of the first wall body 21 is connected to a bending arm located in the cavity, the bending arm is arranged in a circuitous manner between the second side wall 2 and the first side wall 1, and is connected to the second wall body 22 and the first side wall 1, and the bending arm divides the cavity into multiple sub-cavities arranged in upper and lower intervals.

[0036] As shown in the above structure, the battery pack side beam structure of this embodiment is formed by integrally roll-forming the beam body with steel plates, and by setting a bending arm to be arranged between the second wall body 22 and the first side wall 1, the cavity in the beam body is divided into multiple sub-cavities, which can utilize the high strength of the cavity to improve the structural strength of the side beam, and the bending arm is arranged to be arranged between the second wall body 22 and the first side wall 1, which is also conducive to improving the connection strength between the first side wall 1 and the second side wall 2, thereby helping to improve the safety performance of the battery pack. Compared with the solution of increasing the thickness of the traditional aluminum side beam, it is conducive to reducing the space occupied and helping to make the battery pack lightweight. When the beam body is impacted by external force, the bending arm can also act as a reinforcing rib and play a supporting role inside the beam body, thereby further improving the structural performance of the beam body.

[0037] In this embodiment, as a preferred implementation form, Figure 1As shown in , the bending arm of this embodiment has a middle part 211 connected to the first side wall 1, a first part 212 connected between the top of the middle part 211 and the free end of the first wall 21, and a second part 213 connected between the bottom of the middle part 211 and the second wall 22. The first part 212, the second part 213 and the middle part 211 are formed by bending the bending arm, and the structure is simple and easy to form, and has a good connection effect. The first part 212 and the second part 213 divide the interior of the beam body into three sub-cavities, and the first part 212 and the second part 213 constitute a support structure for the middle part 211, that is, the first side wall 1.

[0038] It is understandable that when the beam is impacted by external force, the first part 212 and the second part 213 of the bent arm can act as reinforcing ribs and play a supporting role, which is conducive to the second side wall 2 resisting the impact of external force, and is conducive to preventing the second side wall 2 from collapsing into the beam body, further improving the structural strength of the beam body. Even if the beam body collapses, each sub-cavity in the beam body can also act as a collapse space to accommodate the collapsed first part 212, the second part 213 and the first side wall 1, thereby preventing the battery module in the battery pack from being damaged and improving the safety of the battery pack.

[0039] Specifically, as a preferred implementation form, the spacing between the first part 212 and the second part 213 of this embodiment is gradually increased in the direction away from the middle part 211. The advantage of such a setting is that the first part 212, the middle part 211, the second part 213 and the second wall body 22 can form a sub-cavity with a trapezoidal structure, which has better connection stability. It can be understood that the first part 212 and the second part 213 jointly support the middle part 211 and form a trapezoidal structure, which can to a certain extent avoid the first part 212 and the second part 213 being bent to the same side when the first side wall 1 is subjected to external force, causing the beam body to collapse under force, thereby having a better stabilizing effect.

[0040] At the same time, when the first side wall 1 is subjected to an external force, the external force on the first side wall 1 can be dispersed along the first portion 212 and the second portion 213 to the first wall body 21 and the second wall body 22, so that the bending arm of this embodiment has a better bearing effect, thereby improving the structural strength of the beam body in this embodiment. In specific implementation, the second side wall 2 can be preferably arranged to face the inside of the battery pack, so that the first side wall 1 faces the outside of the battery pack, so as to improve the protection effect on the battery pack.

[0041] It is understandable that the bending arm in this embodiment can also be arranged multiple times between the second wall 22 and the first side wall 1, which can be determined according to the use requirements during specific implementation. In addition, in this embodiment, as a preferred implementation form, the top of the second wall 22 is provided with an upper flange 221 folded into the cavity, the second wall 22 is connected to the first part 212 through the upper flange 221, and the bottom of the second part 213 is provided with a lower flange 214 folded downward, and the second part 213 is connected to the second wall 22 through the lower flange 214. The upper flange 221 and the lower flange 214 have simple structures and are easy to process and form.

[0042] Among them, the provision of the upper flange 221 can increase the contact area between the second wall body 22 and the first part 212, so as to facilitate the connection of the second wall body 22 with the first wall body 21 through the first part 212, thereby ensuring the integrity of the second side wall 2 and enhancing the structural strength of the second side wall 2. The provision of the lower flange 214 can increase the contact area between the second part 213 and the second wall body 22, so as to facilitate the connection between the second part 213 and the second wall body 22, thereby ensuring the connection strength of the second part 213, and facilitating the bending arm to support the beam body, thereby improving the structural strength of the beam body.

[0043] Specifically, as a preferred implementation form, the overlapping length L1 between the upper flange 221 and the first part 212 of this embodiment satisfies: L1 ≥ 5mm. For example, the overlapping length L1 is 5mm, 6mm or 7mm, etc., as long as the structural strength requirements of the beam body are met. When the overlapping length L1 is less than 5mm, the contact area between the upper flange 221 and the first part 212 is too small to meet the strength requirements of the side beam structure of this embodiment. When the beam body is subjected to external force, the upper flange 221 and the first part 212 are easily separated, causing the second side wall 2 to rupture and the beam body structure to be destroyed. Therefore, when the overlapping length L1 between the upper flange 221 and the first part 212 is set to ≥ 5mm, the beam body has better structural strength.

[0044] The overlapping length L2 of the lower flange 214 and the second wall 22 of this embodiment satisfies: L2 ≥ 5 mm, which is also to avoid the contact area between the lower flange 214 and the second wall 22 being too small, causing the second part 213 to be separated from the second wall 22, so that the bending arm cannot support the cavity inside the beam body. For example, the overlapping length L2 is 5 mm, 6 mm or 7 mm, etc., as long as the structural strength requirements of the beam body are met.

[0045] As a preferred implementation form, Figure 2As shown in , the angle β between the upper flange 221 and the second wall 22 of this embodiment satisfies: 40°≤β≤50°, and the bending radius R between the upper flange 221 and the second wall 22 satisfies: R≥3mm. Here, the setting of the angle β makes the bending transition of the upper flange 221 smoother, and makes the upper flange 221 arranged parallel to the first part 212.

[0046] At the same time, the bending radius R between the upper flange 221 and the second wall 22 satisfies: R ≥ 3mm. When the bending radius R < 3mm, the bending radius of the bending part of the upper flange 221 is too small, which makes the surface of the bending part prone to cracks, distortion and other defects. Moreover, if the bending radius R is too small, the bending part will be subjected to additional stress, thereby weakening the strength of the upper flange 221, and easily disconnecting the upper flange 221 from the second wall 22, causing damage to the beam structure. Therefore, when the bending radius R is set to ≥ 3mm, the strength and stability of the upper flange 221 structure can be guaranteed.

[0047] In specific implementation, the angle β can be preferably set to 40°, 45° or 50°, and the bending radius R can be preferably set to 3mm, 5mm or 7mm to meet the strength requirements of the upper flange 221. Of course, the values ​​of the angle β and the bending radius R can also be adjusted according to the use requirements.

[0048] In addition, as a preferred implementation form, the angle α between at least one of the first part 212 and the second part 213 of this embodiment and the middle part 211 satisfies: 130°≤α≤140°, so as to ensure that the beam body has good structural strength.

[0049] Specifically, when the angle α is greater than 140°, the angle between the first part 212 or the second part 213 and the middle part 211 is too large, which may easily weaken the support force of the first part 212 and the second part 213 in the width direction of the beam, resulting in a decrease in the strength of the beam. When the angle α is less than 130°, when the first side wall 1 is subjected to an external force, the first part 212 and the second part 213 cannot effectively support the first side wall 1 in the height direction of the beam, causing the first side wall 1 to easily slide in the height direction of the beam, ultimately causing the beam to collapse, and reducing the protection effect on the battery pack.

[0050] In specific implementation, the first part 212 and the second part 213 can be preferably set to have an equal angle with the middle part 211 to ensure that the external force on the first side wall 1 can be evenly dispersed by the first part 212 and the second part 213, thereby ensuring the structural strength of the beam body. At the same time, the bending radius of the bending arm at the bending point can be preferably set to be greater than 3mm to ensure the strength and stability of the bending point, and the angle α can be preferably set to 130°, 135° or 140°, etc., which can be determined according to the use requirements in specific implementation.

[0051] As a preferred implementation form, Figure 1 As shown in , the width A of the beam body and the height B of the beam body of this embodiment satisfy A≥25mm, B≥2A, and the relationship between the height L3 of the middle part 211 and the height B of the beam body satisfies: L3≥0.2*B. The relationship between the width A and the height B of the beam body is set so that the beam body and the cavity inside the beam body have a certain width, ensuring that when the beam body is collapsed by external force, the cavity has enough space for buffering to avoid damage to the inside of the battery pack, which is conducive to meeting the use requirements of the beam body and the safety requirements of the battery pack. In addition, when the height L3 of the middle part 211 is ≥0.2*B, the contact area between the middle part 211 and the first side wall 1 is larger, and a better connection effect is achieved.

[0052] In specific implementation, the midpoint of the middle part 211 in the height direction can be preferably set to be flush with the midpoint of the beam in height, that is, the midpoint of the middle part 211 is flush with the midpoint of the first side wall 1, so as to ensure that when the first side wall 1 is acted by an external force, the external force can be evenly transmitted to the first part 212 and the second part 213 through the middle part 211. And the beam width A can be preferably set to 25mm, 30mm or 35mm to meet the actual use needs of the beam.

[0053] Furthermore, as a preferred embodiment, the bending arm is connected to the second wall 22 and the first side wall 1 by welding, that is, the upper flange 221 and the first wall 21, the lower flange 214 and the second wall 22, and the middle part 211 and the first side wall 1 are connected by welding. The connection method of welding is easy to achieve, and has good connection strength, thereby ensuring the structural strength of the beam. In addition to the above-mentioned welding connection method, the bending arm and the second wall 22 and the first side wall 1 can also be connected by other methods, such as bonding, riveting, etc., as long as sufficient connection strength is guaranteed.

[0054] The battery pack side beam structure in this embodiment is firstly made by bending a steel plate several times into a truncated shape, and then welding the overlapping parts of the bending, which greatly reduces the difficulty of welding and simplifies the manufacturing process. In addition, the bending arm formed by the bending can effectively improve the rigidity and strength of the side beam, thereby providing a better edge protection effect for the battery pack.

[0055] Compared with the side beams made of traditional aluminum alloy castings and aluminum profiles welded together, they have lower strength, higher cost, and larger size, which occupies more space inside the battery pack. The beam body of this embodiment is formed by roll-forming a steel plate, and the steel plate constituting the beam body can preferably be made of conventional steel with a certain strength, such as stainless steel, etc., which has better structural strength than the side beam structure made of aluminum alloy materials. In addition, with the same structural performance, the side beam structure in this embodiment can reduce the volume and weight of the side beam, thereby saving space inside the battery pack, which is beneficial to increase the capacity of the battery pack while ensuring the safety of the battery pack.

[0056] Moreover, compared with cast beams and profile beams, the battery pack side beam structure of this embodiment has a simple molding process, and has low processing difficulty and cost, which is beneficial to its application in battery packs of different sizes and structures to a certain extent.

[0057] Embodiment 2

[0058] The present embodiment relates to a battery pack, which includes a lower shell. The battery pack side beam structure of the first embodiment is provided on the circumference of the lower shell.

[0059] The battery pack of this embodiment, by providing the battery pack side beam structure in the first embodiment, can enhance the structural strength of the lower shell and help improve the collision performance of the battery pack, thereby helping to improve the safety of the battery pack.

[0060] 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, characterized in that: The beam body comprises a beam body integrally roll-formed from a steel plate, the beam body comprises a first side wall and a second side wall arranged opposite to each other, the second side wall comprises a first wall body connected to the top of the first side wall through a top wall, and a second wall body connected to the bottom of the first side wall through a bottom wall, and a cavity is formed between the first side wall, the second side wall, the top wall and the bottom wall; The free end of the first wall is connected to a bending arm located in the cavity. The bending arm is arranged between the second side wall and the first side wall and is connected to the second wall and the first side wall. The bending arm divides the cavity into a plurality of sub-cavities arranged at intervals in the upper and lower parts.

2. The battery pack side beam structure according to claim 1, characterized in that: The bending arm has a middle portion connected to the first side wall, a first portion connected between the top of the middle portion and the free end of the first wall, and a second portion connected between the bottom of the middle portion and the second wall.

3. The battery pack side beam structure according to claim 2, characterized in that: The distance between the first portion and the second portion is gradually increased in a direction away from the middle portion.

4. The battery pack side beam structure according to claim 2, characterized in that: The top of the second wall is provided with an upper flange folded into the cavity, and the second wall is connected to the first part through the upper flange; and / or, The bottom of the second part is provided with a downwardly folded lower edge, and the second part is connected to the second wall body through the lower flange.

5. The battery pack side beam structure according to claim 4, characterized in that: The overlapping length L1 of the upper flange and the first portion satisfies: L1 ≥ 5 mm; and / or, An overlapping length L2 of the lower flange and the second wall body satisfies: L2 ≥ 5 mm.

6. The battery pack side beam structure according to claim 4, characterized in that: The angle β between the upper flange and the second wall satisfies: 40°≤β≤50°; and / or, The bending radius R between the upper flange and the second wall satisfies: R≥3mm.

7. The battery pack side beam structure according to claim 2, characterized in that: An included angle α between at least one of the first portion and the second portion and the middle portion satisfies: 130°≤α≤140°.

8. The battery pack side beam structure according to claim 2, characterized in that: The width A of the beam body and the height B of the beam body satisfy: A≥25mm, B≥2A; and / or, The relationship between the height L3 of the middle portion and the height B of the beam body satisfies: L3≥0.2*B.

9. The battery pack side beam structure according to any one of claims 2 to 8, characterized in that: The bending arm is connected to the second wall and the first side wall by welding.

10. A battery pack, characterized in that: It comprises a lower shell, and the battery pack side beam structure according to any one of claims 1 to 9 is provided on the circumference of the lower shell.

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