Edge beam, battery pack and vehicle

Abstract

The invention discloses a boundary beam, a battery pack and a vehicle, and belongs to the technical field of batteries. The boundary beam comprises an outer side surface, a bottom surface and a guide inclined surface, the outer side surface and the bottom surface are arranged at an included angle, the guide inclined surface is connected with at least part of the outer side surface and at least part of the bottom surface, and the guide inclined surface is configured to guide the boundary beam to move away from the ground in the second direction when an obstacle acts on the guide inclined surface in the first direction; the first direction is perpendicular to the second direction. When the edge beam serves as a part of a box body of the battery pack and the bottom of the battery pack is impacted by an obstacle in the first direction, due to the arrangement of the guide inclined plane, the impact enables the battery pack to have a trend of moving in the second direction, so that impact energy brought by impact force is decomposed, and the risk that the edge beam is impacted excessively to cause sealing failure of the box body is reduced; and the battery cell in the box body has relatively high safety. And the risk of safety problems caused by bottom rubbing of the battery pack in the running process of the vehicle is greatly reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a side beam, a battery pack and a vehicle. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. New energy vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the driving of new energy vehicles, safety problems caused by bottom scratches frequently occur. When the side beam of the battery pack is excessively deformed after being scratched, the sealing of the battery pack will be greatly reduced, and the risk of battery pack fire and explosion will be significantly increased. In addition, the risk of the battery pack wiring harness connector breaking or disconnecting is also relatively high. Once a vehicle in driving has safety problems caused by the bottom scratch of the battery pack, it is easy to cause casualties.

[0004] Therefore, how to improve the safety of battery packs is an urgent problem to be solved in battery technology. Summary of the invention

[0005] In view of the above problems, the present application provides a side beam, a battery pack and a vehicle, which can improve the safety of the battery pack.

[0006] In the first aspect, the present application provides a side beam, which includes an outer side surface, a bottom surface and a guide slope. The outer side surface and the bottom surface are set at an angle. The guide slope connects at least part of the outer side surface and at least part of the bottom surface. The guide slope is configured to guide the side beam to move away from the ground in a second direction when an obstacle acts on the guide slope along a first direction; the first direction is perpendicular to the second direction.

[0007] In the technical solution of the embodiment of the present application, when the side beam is part of the box of the battery pack and the bottom of the battery pack is hit by an obstacle in the first direction, due to the setting of the guiding slope, the impact will cause the battery pack to have a tendency to move in the second direction, so that the impact energy brought by the impact force is decomposed, reducing the risk of the box sealing failure caused by excessive impact on the side beam, so that the battery cells in the box have higher safety. The risk of safety problems caused by scratches on the bottom of the battery pack during vehicle driving is greatly reduced.

[0008] In an optional embodiment, the side beam includes a first side wall and a second side wall arranged at intervals, and the surface of the first side wall facing away from the second side wall is located on the outer side. A first support rib is arranged inside the side beam, one end of the first support rib is connected to the lower end of the first side wall, and the other end of the first support rib is connected to the second side wall. The angle between the guide slope and the first support rib is α1, which satisfies: 87°≤α1≤93°.

[0009] In the above scheme, when 87°≤α1≤93°, after the impact force is dispersed by the inclined surface, most of the force will be transmitted to the first support rib, so that the dispersed impact force is transmitted to the relatively high strength area in the side beam, reducing the risk of excessive deformation of the side beam causing battery pack sealing failure.

[0010] In an optional embodiment, a second support rib is further provided inside the side beam, one end of the second support rib is connected to the first side wall, and the other end of the second support rib is connected to the second side wall. The first support rib and the second support rib meet at the second side wall.

[0011] In the above solution, the second support rib can further improve the strength of the side beam. At the same time, since the first support rib and the second support rib meet at the second side wall, the strength of the side beam at the position where the impact force is dispersed is further improved, further reducing the risk of excessive deformation of the side beam leading to sealing failure of the battery pack.

[0012] In an optional embodiment, the side beam further includes a bottom wall and a third support rib. The lower ends of the first side wall and the second side wall are both connected to the bottom wall, and the bottom wall extends beyond the side of the second side wall away from the first side wall. The third support rib is located on the side of the second side wall away from the first side wall, one end of the third support rib is connected to the second side wall, and the other end of the third support rib is connected to the bottom wall. The first support rib, the second support rib and the third support rib intersect at the second side wall.

[0013] In the above solution, the provision of the third support rib can further improve the strength of the side beam. At the same time, since the third support rib is located on the side of the second side wall away from the first side wall, the provision of the third support rib can also reduce the risk of the side beam tilting toward the inside of the box body, thereby reducing the risk of the battery cell being damaged by the collision with the side beam. In addition, since the first support rib and the second support rib meet at the second side wall, the strength of the side beam at the position where the impact force is dispersed is further improved, further reducing the risk of excessive deformation of the side beam leading to sealing failure of the battery pack.

[0014] In an optional implementation, the included angle between the guiding inclined plane and the horizontal plane is α2, satisfying: 30°≤α2≤60°.

[0015] In the above scheme, when α2≥30°, the probability of an obstacle acting on the guide slope is higher, and when α2≤60°, the effect of the guide slope in dispersing the impact force is higher. Therefore, when 30°≤α2≤60°, while increasing the probability of an obstacle acting on the guide slope, the guide slope can also have a better effect of dispersing the impact force.

[0016] In an optional embodiment, the side beam includes a first side beam, a second side beam and a third side beam, the first side beam has a first end face and a second end face arranged opposite to each other along a third direction, the first end face is connected to the second side beam, and the second end face is connected to the third side beam. The first side beam is provided with a guide groove, the groove bottom surface of the guide groove is a guide inclined surface, and the guide groove also includes a first groove side face and a second groove side face arranged opposite to each other along the third direction. Along the third direction, the first groove side face is spaced apart from the first end face, and the second groove side face is spaced apart from the second end face.

[0017] In the above scheme, since the first groove side surface is spaced apart from the first end surface and the second groove side surface is spaced apart from the second end surface along the third direction, the risk of increased difficulty in sealing the area where the first side beam is connected to the second side beam and the third side beam due to the setting of the guide groove is reduced, so that the battery pack can have both higher safety and lower assembly difficulty.

[0018] In a second aspect, the present application provides a battery pack, which includes a battery cell and a case, the case including a bottom plate and side beams in one or more of the above-mentioned embodiments, the side beams are arranged around the bottom plate, and the side beams and the bottom plate together define a receiving cavity for accommodating the battery cell.

[0019] In the above scheme, since the side beams in one or more of the above embodiments are provided with guiding slopes that can disperse the impact energy, the battery pack including the side beams in one or more of the above embodiments has a lower risk of causing safety problems due to bottom scratches.

[0020] In an optional embodiment, the battery pack further comprises an electrical connector, which is welded to the side beam to form a weld mark. The guide slope intersects with the outer side surface to form a first edge, which is located below the weld mark and spaced apart from the weld mark.

[0021] In the above solution, when the battery pack is hit, the first edge is generally the impact point. The position where the battery pack is provided with the weld mark is relatively weak. By placing the first edge below the weld mark, the risk of excessive impact force acting on the side beam, causing damage to the side beam, and failure of the box seal can be significantly reduced. At the same time, the risk of deformation or displacement of the electrical connector due to the impact force acting on the side beam, resulting in failure of its connection, can also be reduced.

[0022] In an optional embodiment, the distance between the first edge and the weld mark is H1, which satisfies: 2mm≤H1≤3mm.

[0023] In the above scheme, when H1≥2mm, the probability of the impact force acting on the weld mark is low, the risk of the side beam being excessively damaged by the impact force is low, and the safety of the battery pack is high; when H1≤3mm, it is beneficial to make the guide slope have a larger area, so that the probability of obstacles acting on the guide slope increases, so that the guide slope can disperse the impact force in most cases, and the battery pack has a higher safety; therefore, when 2mm≤H1≤3mm, while reducing the probability of the impact force acting on the weld mark, the probability of the impact force acting on the guide slope can be increased, so that the battery pack has a higher safety.

[0024] In an optional embodiment, a cavity is formed inside the side beam, the first edge is located below the lower wall of the cavity, and along the vertical direction, the distance between the lower wall of the cavity and the first edge is H2, satisfying: 5mm≤H2≤7mm.

[0025] In the above scheme, when H2≥5mm, the volume of the material below the lower wall of the cavity is larger, the strength is higher, and the ability to resist impact force is stronger, thereby reducing the risk of excessive damage to the side beam by impact force and improving the safety of the battery pack; when H2≤7mm, the energy density of the battery pack is higher; therefore, when 5mm≤H2≤7mm, the battery pack can take into account both higher safety and higher energy density.

[0026] In a third aspect, the present application provides a vehicle comprising a battery pack according to one or more of the above-mentioned embodiments.

[0027] In the above scheme, since the battery pack in one or more of the above embodiments has higher safety, the vehicle including the battery pack in one or more of the above embodiments also has higher safety.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0030] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0031] Figure 2An exploded view of a battery pack according to some embodiments of the present application;

[0032] Figure 3 A schematic diagram of the structure of a battery pack according to some embodiments of the present application;

[0033] Figure 4 A schematic diagram of the structure of a battery pack according to some other embodiments of the present application;

[0034] Figure 5 This is a schematic diagram of the structure of the side beams of some embodiments of the present application;

[0035] Figure 6 A cross-sectional view of a portion of the structure of a battery pack according to some embodiments of the present application;

[0036] Figure 7 A cross-sectional view of a portion of the structure of a battery pack according to some other embodiments of the present application;

[0037] Figure 8 It is a cross-sectional view of a partial structure of a battery pack according to some embodiments of the present application, showing the impact position of the bottom-scraping column.

[0038] The reference numerals in the specific implementation manner are as follows:

[0039] 1000-vehicle; 100-battery pack; 11-box; 111-first box; 112-second box; 12-battery cell; 113-side beam; 1131-first side beam; 11311-first side wall; 11312-second side wall; 11313-bottom wall; 70-first supporting rib; 80-second supporting rib; 90-third supporting rib; 1132-second side beam; 1133-third side beam; 1134-fourth side beam; 1135-fifth side beam; 1136-sixth side beam; 114-bottom plate; 115-cover; 20-guide slope; 30-electrical connector; 40-weld stamp; 50-first edge; 60-cavity. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0045] According to the power source of the vehicle, the vehicle can be divided into fuel vehicles, electric vehicles and hybrid vehicles. Fuel vehicles mainly rely on fuel (such as gasoline or diesel) as a power source. Such vehicles usually include an engine that generates power by burning fuel. Electric vehicles generally provide power through batteries, which generally include generators and batteries. Hybrid vehicles generally include two power sources: fuel power and electric power.

[0046] For electric vehicles and hybrid electric vehicles, the battery pack inside the vehicle will be responsible for providing power. Generally, in order to increase the space in the passenger compartment and improve the user experience, the battery pack will be placed at the bottom of the vehicle. During the driving process of the vehicle, sometimes stones or pillars on the road will scratch the battery pack, causing excessive deformation of the battery pack box, seal failure, and even fire, explosion and other safety accidents, which greatly increases the risk of casualties.

[0047] In view of this, the present application provides a side beam, which includes an outer side surface, a bottom surface and a guiding slope. The outer side surface and the bottom surface are arranged at an angle, and the guiding slope connects at least part of the outer side surface and at least part of the bottom surface. The guiding slope is configured to guide the side beam to move away from the ground in a second direction when an obstacle acts on the guiding slope in a first direction; the first direction is perpendicular to the second direction. When the side beam is part of the battery pack case and the bottom of the battery pack is hit by an obstacle in a first direction, due to the setting of the guiding slope, the impact will cause the battery pack to have a tendency to move in the second direction, so that the impact energy brought by the impact force is decomposed, reducing the risk of the side beam being subjected to excessive impact and causing the case seal to fail, so that the battery cells in the case have a higher safety. The risk of safety problems caused by scratches on the bottom of the battery pack during vehicle driving is greatly reduced.

[0048] The following description will take the side beam as a part of the battery pack box as an example.

[0049] According to some embodiments of this application, please refer to Figure 2-Figure 5 The present application provides a side beam 113, which includes an outer side surface, a bottom surface and a guide slope 20. The outer side surface and the bottom surface are set at an angle. The guide slope 20 connects at least part of the outer side surface and at least part of the bottom surface. The guide slope 20 is configured to guide the side beam 113 to move away from the ground in a second direction when an obstacle acts on the guide slope 20 in a first direction; the first direction is perpendicular to the second direction.

[0050] The first direction may be any direction, and the second direction may be any direction perpendicular to the first direction. In some embodiments, the first direction is the front-to-back direction of the battery pack 100 , and the second direction is the top-to-bottom direction of the battery pack 100 .

[0051] In order to meet different power requirements, the battery pack 100 may include a plurality of battery cells 12, wherein the plurality of battery cells 12 may be connected in series, in parallel, or in a hybrid connection, wherein the hybrid connection refers to a mixture of series and parallel connections. The battery pack 100 may also be referred to as the battery pack 100. Optionally, a plurality of battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and a plurality of battery modules may then be connected in series, in parallel, or in a hybrid connection to form a battery pack 100. In other words, a plurality of battery cells 12 may directly form a battery pack 100, or may first form a battery module, and then the battery modules may form a battery pack 100.

[0052] For example, see Figure 2 The battery pack 100 may include a plurality of battery cells 12. The interior of the box body 11 is a hollow structure, and the plurality of battery cells 12 are accommodated in the box body 11. Figure 2As shown, they are respectively referred to as the first box body 111 and the second box body 112, and the first box body 111 and the second box body 112 are buckled together. The shapes of the first box body 111 and the second box body 112 can be determined according to the shapes of the combination of multiple battery cells 12, and the first box body 111 and the second box body 112 can both have an open surface. For example, the first box body 111 and the second box body 112 can both be hollow cuboids and each has only one face as an open face, the open face of the first box body 111 and the open face of the second box body 112 are arranged opposite to each other, and the first box body 111 and the second box body 112 are buckled together to form a box body 11 with a closed accommodating cavity. After the multiple battery cells 12 are connected in parallel or in series or in a mixed combination, they are placed in the box body 11 formed after the first box body 111 and the second box body 112 are buckled. In some embodiments, the side beam 113 can be formed by an extrusion process.

[0053] In some embodiments, the side beam 113 may have a plurality of cavities inside. On the one hand, the weight of the side beam 113 may be reduced to increase the energy density of the battery pack 100. On the other hand, when the side beam 113 is impacted, the cavity may collapse and absorb energy to reduce the risk of damage to the battery cell 12 due to excessive impact force, thereby improving the safety of the battery pack 100.

[0054] When an obstacle at the bottom of the battery pack 100 acts on the guide slope 20, it will tend to slide along the guide slope 20. During the sliding process of the obstacle, the energy brought by the impact will be converted into heat energy of friction, and the potential energy of the battery pack 100 lifting upward will then be converted into kinetic energy acting on the side beam 113, thereby reducing the risk of excessive damage to the side beam 113.

[0055] The outer side surface of the side beam 113 refers to the surface of the side beam 113 that is circumferentially away from the accommodation cavity. The bottom surface of the side beam 113 refers to the surface on the lower side of the side beam 113. The accommodation cavity is used to accommodate the battery cell 12.

[0056] In some embodiments, the bottom surface of the bottom plate 114 is smoothly transitioned to the bottom surface of the side beam 113. Taking the side beam 113 as a beam in the front-to-back direction of the battery pack 100 as an example, the setting of the guide slope 20 can reduce the risk of obstacles on the front side hitting the bottom plate 114. Since the bottom plate 114 carries most of the battery cells 12, the risk of the battery cells 12 being damaged by the impact force can be reduced.

[0057] Before the battery pack 100 leaves the factory, a battery scraping condition test is generally carried out. During the test, the battery pack 100 is loaded into a test trolley, and the performance of the battery pack 100 is evaluated by controlling the collision between the test trolley and the test scraping column during the forward and backward movement. Figure 8 , Figure 8The dotted line in the figure shows the cross section of the bottom-scraping column during the test. The bottom-scraping column is hemispherical, with a diameter of 150mm and made of 45# steel. During the bottom-scraping test, the test trolley moves forward and backward once, with a time interval of more than 2 hours. The forward movement speed of the test trolley is 20km / h to 21km / h, and the backward movement speed of the test trolley is 5km / h to 6km / h. The above speeds are the speeds when the bottom-scraping column collides with the battery pack 100. The inclination angle of the control trolley in the up and down direction is 3°, and the height of the bottom-scraping column is determined in accordance with the China-New Car Assessment Program (C-NACP). After the scraping bottom test is completed, if the battery pack 100 meets the following requirements: no fire, no explosion; composite requirements for air tightness test; insulation resistance value of the battery pack 100 is not less than 500Ω / V; water immersion test is carried out in accordance with GB38031-2020, and there is no water stain inside the battery pack 100; the wiring harness connector is not broken or disconnected; and the fixing point between the battery pack 100 and the test trolley does not fail after the test. Then the battery pack 100 is considered to have passed the scraping bottom test. After setting the guide ramp 20, the pass rate of the scraping bottom test of the battery pack 100 is significantly improved.

[0058] In the technical solution of the embodiment of the present application, when the side beam 113 is a part of the box 11 of the battery pack 100 and the bottom of the battery pack 100 is hit by an obstacle in the first direction, due to the setting of the guide slope 20, the impact will cause the battery pack 100 to have a tendency to move in the second direction, so that the impact energy brought by the impact force is decomposed, reducing the risk of the box 11 sealing failure caused by excessive impact on the side beam 113, so that the battery cells 12 in the box 11 have higher safety. The risk of safety problems caused by scratches on the bottom of the battery pack 100 during the driving of the vehicle 1000 is greatly reduced.

[0059] According to some embodiments of this application, please refer to Figure 7 The side beam 113 includes a first side wall 11311 and a second side wall 11312 that are spaced apart, and the surface of the first side wall 11311 that is away from the second side wall 11312 is located on the outer side. A first support rib 70 is disposed inside the side beam 113, one end of the first support rib 70 is connected to the lower end of the first side wall 11311, and the other end of the first support rib 70 is connected to the second side wall 11312. The angle between the guide slope 20 and the first support rib 70 is α1, which satisfies: 87°≤α1≤93°.

[0060] The angle between the guide slope 20 and the first support rib 70 can be any value greater than or equal to 87° and less than or equal to 93°, for example, 87°, 87.5°, 88°, 88.5°, 89°, 89.5°, 90°, 90.5°, 91°, 91.5°, 92°, 92.5°, and 93°.

[0061] Please refer to Figure 7 and Figure 8 During the bottom scraping test, the bottom scraping column hits the side beam 113 in the front-to-back direction to simulate the situation where an obstacle hits the side beam 113 in the front-to-back direction. At this time, the first position to be subjected to force is the first edge 50. At this time, due to the setting of the guide slope 20, the impact force will be decomposed into a normal force perpendicular to the guide slope 20 and a tangential force tangent to the position where the bottom scraping column contacts the first edge 50. Since the tangential force transmitted to the side beam 113 is small, most of the force transmitted to the side beam 113 is the normal force. When the angle between the guide slope 20 and the first support rib 70 satisfies 87°≤α1≤93°, the first support rib 70 is basically located in the direction of transmission of the normal force. The first support rib 70 can significantly reduce the risk of excessive deformation of the side beam 113 caused by the normal force.

[0062] In the above scheme, when 87°≤α1≤93°, after the impact force is dispersed by the guide slope 20, most of the force will be transmitted to the first support rib 70, so that the dispersed impact force is transmitted to the relatively high strength area in the side beam 113, reducing the risk of excessive deformation of the side beam 113 causing sealing failure of the battery pack 100. And because the first support rib 70 is connected to the first side wall 11311 and the second side wall 11312, the risk of sudden change in the transmission direction of the normal force is small, and the first support rib 70 can play a strong supporting role.

[0063] According to some embodiments of this application, please refer to Figure 7 A second support rib 80 is further provided inside the side beam 113. One end of the second support rib 80 is connected to the first side wall 11311, and the other end of the second support rib 80 is connected to the second side wall 11312. The first support rib 70 and the second support rib 80 meet at the second side wall 11312.

[0064] The first support rib 70 and the second support rib 80 intersect at the second side wall 11312 , which means that the first support rib 70 , the second side wall 11312 and the first side wall 11311 form a “triangle” structure, which can improve the ability of the first support rib 70 to resist the normal force, thereby improving the strength of the side beam 113 .

[0065] In the above solution, the second support rib 80 can further improve the strength of the side beam 113. At the same time, since the first support rib 70 and the second support rib 80 intersect at the second side wall 11312, the strength of the side beam 113 at the position where the impact force is dispersed is further improved, further reducing the risk of excessive deformation of the side beam 113 leading to sealing failure of the battery pack 100.

[0066] According to some embodiments of this application, please refer to Figure 7The side beam 113 further includes a bottom wall 11313 and a third support rib 90. The lower ends of the first side wall 11311 and the second side wall 11312 are both connected to the bottom wall 11313, and the bottom wall 11313 extends beyond the side of the second side wall 11312 away from the first side wall 11311. The third support rib 90 is located on the side of the second side wall 11312 away from the first side wall 11311, one end of the third support rib 90 is connected to the second side wall 11312, and the other end of the third support rib 90 is connected to the bottom wall 11313. The first support rib 70, the second support rib 80 and the third support rib 90 intersect at the second side wall 11312.

[0067] In some embodiments, the bottom wall 11313 is connected to the bottom plate 114 of the box body 11 .

[0068] In some embodiments, a plurality of third support ribs 90 are provided, and the plurality of third support ribs 90 are spaced apart in the left-right direction. Such a configuration can improve the ability of the side beam 113 to resist impact force while providing the battery pack 100 with a higher energy density.

[0069] In the above solution, the third support rib 90 can further improve the strength of the side beam 113. At the same time, since the third support rib 90 is located on the side of the second side wall 11312 away from the first side wall 11311, the third support rib 90 can also reduce the risk of the side beam 113 tilting toward the inside of the box 11, thereby reducing the risk of the battery cell 12 colliding with the side beam 113 and causing damage to the battery cell 12. In addition, since the first support rib 70 and the second support rib 80 meet at the second side wall 11312, the strength of the side beam 113 at the position where it withstands the dispersed impact force is further improved, further reducing the risk of excessive deformation of the side beam 113 causing sealing failure of the battery pack 100.

[0070] According to some embodiments of this application, please refer to Figure 7 The included angle between the guide slope 20 and the horizontal plane is α2, which satisfies: 30°≤α2≤60°.

[0071] The angle between the guide slope 20 and the horizontal plane can be any value greater than or equal to 30° and less than or equal to 60°, for example, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, etc.

[0072] In the above scheme, when α2≥30°, the probability of an obstacle acting on the guide slope 20 is higher, and when α2≤60°, the effect of the guide slope 20 in dispersing the impact force is higher. Therefore, when 30°≤α2≤60°, while increasing the probability of an obstacle acting on the guide slope 20, the guide slope 20 can also have a better effect of dispersing the impact force.

[0073] According to some embodiments of this application, please refer to Figure 3-Figure 5 The side beam 113 includes a first side beam 1131, a second side beam 1132 and a third side beam 1133. The first side beam 1131 has a first end face and a second end face arranged opposite to each other along a third direction. The first end face is connected to the second side beam 1132, and the second end face is connected to the third side beam 1133. The first side beam 1131 is provided with a guide groove, and the groove bottom surface of the guide groove is a guide inclined surface 20. The guide groove also includes a first groove side face and a second groove side face arranged opposite to each other along the third direction. Along the third direction, the first groove side face is spaced apart from the first end face, and the second groove side face is spaced apart from the second end face.

[0074] In some embodiments, the first end surface is connected to the second side beam 1132 by welding.

[0075] In some embodiments, the second end surface is connected to the third side beam 1133 by welding.

[0076] In some embodiments, the third direction is a left-right direction.

[0077] In some embodiments, the side beam 113 further includes a fourth side beam 1134, a fifth side beam 1135 and a sixth side beam 1136, the fourth side beam 1134 and the fifth side beam 1135 are arranged opposite to each other in the left-right direction, the sixth side beam 1136 and the first side beam 1131 are arranged opposite to each other in the front-back direction, the second side beam 1132 connects the first side beam 1131 and the fourth side beam 1134, the fourth side beam 1134 connects the sixth side beam 1136 and the second side beam 1132, the third side beam 1133 connects the first side beam 1131 and the fifth side beam 1135, and the fifth side beam 1135 connects the sixth side beam 1136 and the third side beam 1133. In some other embodiments, the second side beam 1132, the third side beam 1133, the fourth side beam 1134, the fifth side beam 1135 and the sixth side beam 1136 are all provided with mounting beams, and the mounting beams are used to mount the battery pack 100 on the vehicle 1000.

[0078] The first groove side surface is spaced apart from the first end surface, and the second groove side surface is spaced apart from the second end surface, which means that the setting of the guide groove will not increase the difficulty of sealing after the first side beam 1131 is connected. For example, please refer to 5, a solid area will be formed on both sides of the left and right directions of the guide groove. Taking the welding connection of the first end surface and the second side beam 1132 as an example, the weld is relatively regular, and the risk of sealing failure after the first side beam 1131 and the second side beam 1132 are connected is low.

[0079] In the above scheme, since the first groove side surface is spaced apart from the first end surface and the second groove side surface is spaced apart from the second end surface along the third direction, the risk of increased difficulty in sealing the area where the first side beam 1131 is connected to the second side beam 1132 and the third side beam 1133 due to the setting of the guide groove is reduced, so that the battery pack 100 can have both higher safety and lower assembly difficulty.

[0080] According to some embodiments of this application, please refer to Figure 3-Figure 6 The present application provides a battery pack 100, which includes a battery cell 12 and a box body 11. The box body 11 includes a bottom plate 114 and side beams 113 in one or more of the above-mentioned embodiments. The side beams 113 are surrounded by the bottom plate 114. The side beams 113 and the bottom plate 114 jointly define a receiving cavity for accommodating the battery cell 12.

[0081] In some embodiments, the box body 11 further includes a cover body 115 , and the cover body 115 , the side beams 113 , and the bottom plate 114 together define a receiving cavity.

[0082] In the above scheme, since the side beam 113 in one or more of the above embodiments is provided with a guiding slope 20 that can disperse the impact energy, the battery pack 100 including the side beam 113 in one or more of the above embodiments has a lower risk of causing safety problems due to bottom scratches.

[0083] According to some embodiments of this application, please refer to Figure 3-Figure 6 The battery pack 100 further includes an electrical connector 30, which is welded to the side beam 113 to form a weld mark 40. The guide slope 20 intersects with the outer side surface to form a first edge 50, which is located below the weld mark 40 and spaced apart from the weld mark 40.

[0084] The welding methods may include but are not limited to laser welding, electron beam welding, argon arc welding and the like.

[0085] Due to the presence of the weld mark 40 , the strength of the position of the side beam 113 where the weld mark 40 is present is relatively lower than that of other positions of the side beam 113 .

[0086] Please refer to Figure 5 and Figure 6When the bottom obstacle acts on the guiding slope 20 , the first edge 50 is the position farthest from the accommodating cavity, and generally the impact point will be the position of the first edge 50 .

[0087] The electrical connector 30 may include, but is not limited to, a fast charging connector disposed on the side beam 113, a connector for connecting to a motor, a control harness connector, a high-voltage connector, a low-voltage connector, etc. Damage to the electrical connector or excessive deformation of its periphery will significantly increase the risk of connection failure. Therefore, the first edge 50 is disposed below the weld mark 40 and spaced apart from the weld mark 40, which can significantly reduce the risk of failure of the electrical connector 30.

[0088] In the above scheme, when the battery pack 100 is hit, the first edge 50 is generally the impact point, and the position where the weld mark 40 of the battery pack 100 is set is relatively weak. The first edge 50 is set below the weld mark 40, which can significantly reduce the risk of excessive impact force acting on the side beam 113, causing damage to the side beam 113 and failure of the sealing of the box 11. At the same time, it can also reduce the risk of deformation or displacement of the electrical connector 30 caused by the impact force acting on the side beam 113, resulting in its connection failure. In addition, since the guide bevel 20 connects the outer side surface of the side beam 113 and the bottom surface of the side beam 113, the setting of the guide bevel 20 will not lose the energy density of the battery pack 100.

[0089] According to some embodiments of this application, please refer to Figure 6 The distance between the first edge 50 and the weld mark 40 is H1, which satisfies: 2mm≤H1≤3mm.

[0090] The distance between the first edge 50 and the weld mark 40 can be any value greater than or equal to 2 mm and less than or equal to 3 mm, for example, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, etc.

[0091] In the above scheme, when H1≥2mm, the probability of the impact force acting on the weld mark 40 is low, the risk of the side beam 113 being excessively damaged by the impact force is low, and the safety of the battery pack 100 is high; when H1≤3mm, it is beneficial to make the guide slope 20 have a larger area, so that the probability of obstacles acting on the guide slope 20 increases, so that the guide slope 20 can disperse the impact force in most cases, and the battery pack 100 has a higher safety; therefore, when 2mm≤H1≤3mm, while reducing the probability of the impact force acting on the weld mark 40, the probability of the impact force acting on the guide slope 20 can be increased, so that the battery pack 100 has a higher safety.

[0092] According to some embodiments of this application, please refer to Figure 7A cavity 60 is formed inside the side beam 113, and the first edge 50 is located below the lower wall of the cavity 60. Along the vertical direction, the distance between the lower wall of the cavity 60 and the first edge 50 is H2, satisfying: 5mm≤H2≤7mm.

[0093] The distance between the lower wall of the cavity 60 and the first edge 50 can be any value greater than or equal to 5 mm and less than or equal to 7 mm, for example, 5 mm, 5.1 mm, 5.2 mm, 5.3 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.7 mm, 5.8 mm, 5.9 mm, 6 mm, 6.1 mm, 6.2 mm, 6.3 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.7 mm, 6.8 mm, 6.9 mm, 7 mm, etc.

[0094] In the above scheme, when H2≥5mm, the volume of the material below the lower wall of the cavity 60 is larger, the strength is higher, and the ability to resist impact force is stronger, thereby reducing the risk of excessive impact force damaging the side beam 113 and improving the safety of the battery pack 100; when H2≤7mm, the energy density of the battery pack 100 is higher; therefore, when 5mm≤H2≤7mm, the battery pack 100 can take into account both higher safety and higher energy density.

[0095] According to some embodiments of this application, please refer to Figure 1 , the present application provides a vehicle 1000, which includes a battery pack 100 in one or more of the above-mentioned embodiments.

[0096] A motor, a controller and a battery pack 100 may be provided inside the vehicle 1000, and the controller is used to control the battery pack 100 to power the motor. For example, a battery pack 100 may be provided at the bottom tail of the vehicle 1000. The battery pack 100 may be used to power the vehicle 1000, for example, the battery pack 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery pack 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] In some embodiments, the box 11 may be a part of the chassis structure of the vehicle 1000. For example, part of the box 11 may become at least a part of the floor of the vehicle 1000, or part of the box 11 may become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0098] In the above solution, since the battery pack 100 in one or more of the above embodiments has high safety, the vehicle 1000 including the battery pack 100 in one or more of the above embodiments also has high safety.

[0099] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A side beam, characterized in that: The side beam includes an outer side surface, a bottom surface and a guide slope, the outer side surface and the bottom surface are set at an angle, the guide slope connects at least part of the outer side surface and at least part of the bottom surface, and the guide slope is configured to guide the side beam to move away from the ground in a second direction when an obstacle acts on the guide slope in a first direction; the first direction is perpendicular to the second direction.

2. The side beam according to claim 1, characterized in that: The side beam comprises a first side wall and a second side wall which are spaced apart from each other, and a surface of the first side wall which faces away from the second side wall is located on the outer side surface; A first supporting rib is disposed inside the side beam, one end of the first supporting rib is connected to the lower end of the first side wall, and the other end of the first supporting rib is connected to the second side wall; The included angle between the guiding inclined surface and the first supporting rib is α1, which satisfies: 87°≤α1≤93°.

3. The side beam according to claim 2, characterized in that: A second supporting rib is further provided inside the side beam, one end of the second supporting rib is connected to the first side wall, and the other end of the second supporting rib is connected to the second side wall; The first supporting rib and the second supporting rib meet at the second side wall.

4. The side beam according to claim 3, characterized in that: The side beam further comprises a bottom wall and a third supporting rib; The lower ends of the first side wall and the second side wall are both connected to the bottom wall, and the bottom wall extends beyond a side of the second side wall away from the first side wall; The third supporting rib is located on a side of the second side wall away from the first side wall, one end of the third supporting rib is connected to the second side wall, and the other end of the third supporting rib is connected to the bottom wall; The first supporting rib, the second supporting rib and the third supporting rib meet at the second side wall.

5. The side beam according to any one of claims 1 to 4, characterized in that: The included angle between the guiding inclined plane and the horizontal plane is α2, which satisfies: 30°≤α2≤60°.

6. The side beam according to any one of claims 1 to 4, characterized in that: The side beam comprises a first side beam, a second side beam and a third side beam, the first side beam has a first end face and a second end face arranged opposite to each other along a third direction, the first end face is connected to the second side beam, and the second end face is connected to the third side beam; The first side beam is provided with a guide groove, the groove bottom surface of the guide groove is the guide inclined surface, and the guide groove further includes a first groove side surface and a second groove side surface which are arranged opposite to each other along the third direction; Along the third direction, the first groove side surface is spaced apart from the first end surface, and the second groove side surface is spaced apart from the second end surface.

7. A battery pack, characterized in that: include: Battery cells; A box body comprises a bottom plate and side beams as described in any one of claims 1 to 6, wherein the side beams are arranged around the bottom plate, and the side beams and the bottom plate jointly define a receiving cavity for accommodating the battery cell.

8. The battery pack according to claim 7, characterized in that: The battery pack further comprises an electrical connector, wherein the electrical connector is welded to the side beam to form a weld mark; The guiding inclined surface intersects with the outer side surface to form a first edge, and the first edge is located below the welding mark and is spaced apart from the welding mark.

9. The battery pack according to claim 8, characterized in that: The distance between the first edge and the weld mark is H1, which satisfies: 2mm≤H1≤3mm.

10. The battery pack according to claim 8, characterized in that: A cavity is formed inside the side beam, the first edge is located below the lower wall of the cavity, and along the vertical direction, the distance between the lower wall of the cavity and the first edge is H2, satisfying: 5mm≤H2≤7mm.

11. A vehicle, characterized in that: Comprising a battery pack as claimed in any one of claims 7 to 10.

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