Battery pack

Abstract

The battery pack is applied to an electric vehicle and comprises a box body and a battery cell located in the box body, the box body comprises a bottom sealing plate and an enclosure frame arranged above the bottom sealing plate, the enclosure frame comprises a frame and a partition beam, the frame surrounds the bottom sealing plate and defines a containing cavity, and the partition beam is arranged in the containing cavity. The partition beams divide the accommodating cavity into a plurality of battery mounting cavities for mounting battery cells; the box body further comprises a lock seat, and a lock pin is installed on the lock seat so that the battery pack can be connected to a chassis of the electric vehicle through the lock pin. The separation beam comprises a first rolling beam body formed through rolling, and the lock seat is formed on the top of the first rolling beam body. According to the battery pack provided by the invention, the realization of light weight of the box body and the saving of the manufacturing cost are facilitated, the anti-fatigue performance and the strength of the lock seat can be improved through the rolling process, the risk that the lock seat is damaged is greatly reduced, and the service life of the box body is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery packs of electric vehicles, and in particular to a battery pack. BACKGROUND

[0002] Electric vehicles have the advantages of zero emission, low noise, high cost performance of operation and maintenance, and are more and more favored by users. The energy used by the electric vehicle is the electric energy provided by the battery pack carried by the electric vehicle, and the battery pack needs to be charged after the electric energy is used up. The setting mode of the battery pack of the electric vehicle is generally divided into fixed type and replaceable type, wherein the fixed type battery pack is generally fixed on the vehicle, and the vehicle is directly taken as the charging object during charging. The replaceable battery pack is generally fixed on the bracket of the vehicle through movable installation, and the battery pack can be taken off for separate replacement or charging operation, and after the replaced battery pack is charged, it is installed on the vehicle.

[0003] Most of the existing replaceable battery packs are installed on the chassis of the electric vehicle through a locking pin. Specifically, a lock piece is arranged on the chassis of the electric vehicle, and a lock seat is arranged on the box body of the battery pack. The locking pin is installed on the lock seat, and when the locking pin is connected to the lock piece, the battery pack is installed on the chassis. The lock seat is usually a casting, which is fixed on the top of the box body by bolts. The casting has weak fatigue resistance, and the battery pack is a heavy object, especially the battery pack of a pure electric heavy truck, which can even reach a ton of weight. The heavy gravity of the battery pack acts on the lock seat for a long time, which can easily cause damage to the lock seat. Moreover, the processing cost of the casting is high, which increases the cost of the battery pack. Generally, a thick plate needs to be welded on the top of the box body first, and then the lock seat is installed on the thick plate through bolts, and post-weld machining is also required. It can be seen that the installation process of the casting lock seat is complex.

[0004] Secondly, the development trend of the battery pack is to gradually improve the endurance capability and to be as light as possible. However, most of the traditional box bodies are welded by multiple rectangular tubes (such as steel tubes, aluminum tubes, etc.). The rectangular tube is a standard part, and the overall thickness and the wall thickness of the rectangular tube that meets the strength requirement of the box body are large, which makes the box body large in size and heavy in weight, is not conducive to the lightweight development of the battery pack, and also increases the difficulty of dismounting and replacing the battery pack on the electric vehicle, brings huge pressure to the battery replacement equipment, and brings great bearing pressure to the chassis of the electric vehicle. Moreover, the greater the weight of the battery pack, the greater the loss during the driving of the electric vehicle, and the weaker the endurance capability.

[0005] Therefore, the existing technology has many drawbacks and needs to be further improved and enhanced. CONTENT OF THE UTILITY MODEL

[0006] The application provides a battery pack, which simplifies the processing technology and installation steps of the lock seat, helps to improve the structural strength and fatigue resistance, is more economical, and solves at least one technical problem in the background art.

[0007] The technical scheme adopted by the application is:

[0008] A battery pack applied to an electric vehicle comprises a box body and battery cells in the box body. The box body comprises a bottom sealing plate and a surrounding frame arranged above the bottom sealing plate. The surrounding frame comprises a frame and a partition beam. The frame surrounds the bottom sealing plate and forms a containing cavity. The partition beam separates the containing cavity into a plurality of battery mounting cavities for mounting the battery cells. The box body further comprises a lock seat, which is provided with a lock pin. The battery pack is connected to the chassis of the electric vehicle through the lock pin. The partition beam comprises a first roll-formed beam body. The lock seat is formed on the top of the first roll-formed beam body.

[0009] In the technical scheme, the partition beam comprises a first roll-formed beam body. Compared with the rectangular tube made of a standard part, the roll-formed structure can be adjusted in size as needed, which helps to reduce the overall thickness of the partition beam. The roll forming process has high production efficiency and material utilization rate, which helps to realize the lightweight of the box body and save manufacturing costs, has relatively high economic efficiency, and also helps to give the box body better vibration and mechanical properties. In addition, in the present scheme, the lock seat is no longer a casting fixed on the box body by bolts, but is formed on the top of the first roll-formed beam body. In other words, the completion of the roll forming process of the first roll-formed beam body also represents that the lock seat is roll formed, which greatly simplifies the forming process of the box body and saves the installation steps of the lock seat. The roll forming process can improve the fatigue resistance and strength of the lock seat. In the preferred scheme in which the first roll-formed beam body is roll formed by high-strength steel, the fatigue resistance and strength of the lock seat are significantly improved, which greatly reduces the risk of damage to the lock seat and prolongs the service life of the box body.

[0010] Preferably, the projection of the first roll-formed beam body on a plane perpendicular to the first roll-formed beam body is a closed structure.

[0011] In the technical scheme, the first roll-formed beam body is a closed structure, which can effectively improve the structural strength, greatly increase the compression resistance, tensile resistance and shear resistance, reduce the risk of deformation, and enable the lock pin installed on the lock seat to stably hang the battery pack on the vehicle bottom.

[0012] Preferably, the first roll-formed beam body is provided with a plurality of cavities arranged in a vertical direction. The wall of the first roll-formed beam body for forming the top cavity forms the lock seat.

[0013] In the technical solution, the first roller pressing beam body is provided with multiple cavities, so that the partition beam can meet the thickness requirement and the weight can be reduced by using the cavities to achieve lightweight of the battery pack. Moreover, the first roller pressing beam body needs to be pressed in multiple directions by the base material to form multiple cavities, and the multiple-direction pressing manner can improve the strength and further reduce the deformation risk.

[0014] Preferably, the lock seat is provided with multiple connection holes arranged at intervals in the length direction, each of the connection holes is provided with the lock pin, and the top of the lock seat is provided with a corresponding avoiding hole for the lock pin, so that the lock part on the chassis of the electric vehicle can enter the lock seat through the avoiding hole and be connected and matched with the lock pin.

[0015] In the technical solution, the lock pin is arranged in the connection hole of the lock seat, and the avoiding hole is used to avoid the lock part on the chassis of the electric vehicle, so that the lock part can enter the avoiding hole by lifting the battery pack upward during the installation of the battery pack, and then be connected and matched with the lock pin, thereby improving the convenience of installing the battery pack on the vehicle.

[0016] Preferably, the lock pin is higher than the frame in the vertical direction.

[0017] In the technical solution, since the lock pin is higher than the frame in the vertical direction, the lock seat needs to be raised as a whole to lift the lock pin to a position higher than the frame, which can help to avoid interference between the frame and other accessories on the electric vehicle during the connection and matching of the lock part and the lock pin, facilitate the hanging and matching of the lock part and the lock pin, reduce the height that needs to be lifted during the installation of the battery pack, and improve the safety of battery replacement.

[0018] Preferably, the two ends of the lock seat in the length direction are closed by the sealing plates.

[0019] In the technical solution, the two ends of the lock seat are closed by the sealing plates, which can improve the structural strength of the lock seat and further improve the pressure bearing capacity, so that the lock seat is not easy to deform, and the dust and dirt from the outside can also be prevented from entering the lock seat.

[0020] Preferably, the first roller pressing beam body comprises multiple roller pressing sections, and the multiple roller pressing sections are connected in sequence from top to bottom.

[0021] In the technical solution, the multiple roller pressing sections are connected in sequence from top to bottom to form the first roller pressing beam body, which can improve the strength and reduce the deformation risk compared with the single roller pressing structure of the first roller pressing beam body.

[0022] Preferably, the adjacent two roller pressing sections are welded, the two ends of the first roller pressing beam body are welded with the frame, and the bottom of the first roller pressing beam body is welded with the bottom sealing plate.

[0023] In the technical solution, the roll-pressed sections are connected by welding, the first roll-pressed beam body and the frame are connected by welding, and the first roll-pressed beam body and the bottom sealing plate are connected by welding, which helps to ensure the integrity and structural stability of the box body, improve the loading capacity, reduce the risk of deformation, and increase the service life.

[0024] Preferably, the frame comprises a longitudinal side beam and a transverse side beam, the longitudinal side beam comprises a second roll-pressed beam body made by rolling, and the transverse side beam comprises a third roll-pressed beam body made by rolling.

[0025] In the technical solution, the longitudinal side beam comprises a second roll-pressed beam body made by rolling, and the transverse side beam comprises a third roll-pressed beam body made by rolling. Compared with using a rectangular tube made of standard parts to manufacture the frame, the rolling structure can be adjusted in size as needed, which helps to reduce the overall thickness of the frame, and the rolling process has high production efficiency and material utilization rate, which helps to achieve lightweight and cost savings of the box body, has relatively high economic efficiency, and also helps to give the box body better vibration and mechanical properties, significantly improves the fatigue resistance and strength of the frame, greatly reduces the risk of damage, and improves the service life of the box body.

[0026] Preferably, the projection of the second roll-pressed beam body on the plane where the third roll-pressed beam body is located is a closed structure, and the projection of the third roll-pressed beam body on the plane where the second roll-pressed beam body is located is a closed structure.

[0027] In the technical solution, by making the second roll-pressed beam body and the third roll-pressed beam body a circumferentially closed structure, the structural strength can be effectively improved, the compression resistance, tensile resistance, and shear resistance can be greatly increased, and the risk of deformation can be reduced.

[0028] Preferably, the second roll-pressed beam body is provided with a plurality of cavities arranged in the vertical direction in sequence, and / or the third roll-pressed beam body is provided with a plurality of cavities arranged in the vertical direction in sequence.

[0029] In the technical solution, by providing the second roll-pressed beam body and the third roll-pressed beam body with a plurality of cavities, the frame can help to reduce weight by using the cavities to meet the corresponding thickness requirements, achieve lightweight of the battery pack, and further reduce the risk of deformation by the multiple-directionally indirect rolling of the second roll-pressed beam body and the third roll-pressed beam body through the base material.

[0030] Preferably, the second roll-pressed beam body comprises a plurality of longitudinal roll-pressed sections connected in sequence from top to bottom, and the third roll-pressed beam body comprises a plurality of transverse roll-pressed sections connected in sequence from top to bottom.

[0031] In the technical solution, the plurality of longitudinal roller pressing sections are sequentially connected from top to bottom to form the second roller pressing beam body, and the plurality of transverse roller pressing sections are sequentially connected from top to bottom to form the third roller pressing beam body, which helps to improve the strength and reduce the risk of deformation compared to designing the second roller pressing beam body and the third roller pressing beam body as a single roller pressing structure.

[0032] Preferably, the bottom of the second roller pressing beam body is provided with a longitudinal roller pressing protruding edge extending into the accommodating cavity in the horizontal direction, and the bottom of the third roller pressing beam body is provided with a transverse roller pressing protruding edge extending into the accommodating cavity in the horizontal direction, and the bottom sealing plate is connected to the longitudinal roller pressing protruding edge and the transverse roller pressing protruding edge, respectively.

[0033] In the technical solution, by providing the longitudinal roller pressing protruding edge and the transverse roller pressing protruding edge, the frame is conveniently connected to the bottom sealing plate, especially after the frame is horizontally butted to the bottom sealing plate to realize welding.

[0034] Preferably, the box further includes an upper bracket covering the battery mounting cavity and used for supporting the battery cell, and the frame supports the upper bracket together with the partition beam.

[0035] In the technical solution, in addition to that the battery mounting cavity can accommodate the battery cell, the upper bracket can also support the battery cell, so that the battery cells are arranged in layers on the box, the installation space is fully utilized, the number of battery cells that can be accommodated by one box is increased, and the endurance of the electric vehicle is greatly improved.

[0036] Preferably, the first roller pressing beam body is provided with a first longitudinal roller pressing recess, the second roller pressing beam body is provided with a second longitudinal roller pressing recess, and the third roller pressing beam body is provided with a transverse roller pressing recess, and the first longitudinal roller pressing recess, the second longitudinal roller pressing recess and the transverse roller pressing recess together support the upper bracket.

[0037] In the technical solution, the first longitudinal roller pressing recess, the second longitudinal roller pressing recess and the transverse roller pressing recess are formed by a roller pressing process, and have simple structure and high strength, and the first longitudinal roller pressing recess, the second longitudinal roller pressing recess and the transverse roller pressing recess together support the upper bracket, which has high support stability.

[0038] With the above technical solutions, the application has the following technical effects: the partition beam comprises a first roller-pressed beam body, compared with manufacturing the partition beam by using a standard rectangular pipe, the roller-pressed structure can be adjusted in size as needed, which helps to reduce the overall thickness of the partition beam, the roller-pressing process has high production efficiency and material utilization rate, which helps to realize the lightweight of the box body and save manufacturing cost, has relatively high economy, and also helps to give the box body better vibration and mechanical properties. In addition, in the present solution, the lock seat is no longer a casting fixed on the box body by bolts, but is formed on the top of the first roller-pressed beam body, in other words, the completion of the roller-pressing forming process of the first roller-pressed beam body also represents that the lock seat is roller-pressed and formed, which greatly simplifies the forming process of the box body and saves the installation step of the lock seat. The roller-pressing process can improve the fatigue resistance and strength of the lock seat, especially in the preferred solution that the first roller-pressed beam body is roller-pressed and formed by using high-strength steel, the fatigue resistance and strength of the lock seat are obviously improved, which greatly reduces the risk of damage of the lock seat and prolongs the service life of the box body. BRIEF DESCRIPTION OF DRAWINGS

[0039] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and serve to explain the principles of the application, and do not limit the application in any way. In the drawings:

[0040] Figure 1 Assembly of the battery pack provided by the embodiments of the application Figure 1 ;

[0041] Figure 2 Assembly of the battery pack provided by the embodiments of the application Figure 2 , which shows the state of the battery pack after the upper layer of the bracket is removed;

[0042] Figure 3 Assembly of the box provided by the embodiments of the application Figure 1 ;

[0043] Figure 4 Assembly of the box provided by the embodiments of the application Figure 2 , which shows the state of the box after the upper layer of the bracket is removed;

[0044] Figure 5 is an enlarged view of A in FIG. Figure 4

[0045] Figure 6 Assembly drawing of the partition beam and the lock pin provided by the embodiments of the application

[0046] Figure 7 is an enlarged view of B in FIG. Figure 6

[0047] ​​Figure 8 A structure schematic diagram of a second roller pressing beam provided by an embodiment of the present application is shown in the figure.

[0048] Figure 9 For Figure 8 An enlarged view at C.

[0049] Figure 10 A structure schematic diagram of a third roller pressing beam provided by an embodiment of the present application is shown in the figure.

[0050] Parts and list of reference numerals:

[0051] 1 box, 11 bottom sealing plate, 12 frame, 121 second roller pressing beam, 1211 longitudinal roller pressing section, 1212 longitudinal roller pressing convex, 1213 second longitudinal roller pressing recess, 122 third roller pressing beam, 1221 transverse roller pressing section, 1222 transverse roller pressing convex, 1223 transverse roller pressing recess, 13 partition beam, 131 lock seat, 132 first roller pressing beam, 1321 roller pressing section, 1322 first longitudinal roller pressing recess, 133 connecting hole, 134 avoiding hole, 14 lock pin, 15 sealing plate, 16 upper bracket;

[0052] 2 battery cell. DETAILED DESCRIPTION

[0053] In order to more clearly explain the overall concept of the present application, the following will be described in detail with reference to the accompanying drawings.

[0054] In the following description, a lot of specific details are set forth in order to facilitate a thorough understanding of the present application, however, the present application can also be implemented in other ways different from those described herein, therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below.

[0055] In the present application, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “fixing” and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, or communication; can be directly connected, or indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0056] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0057] In the embodiments of this application, a battery pack is provided. For ease of explanation and understanding, the following content provided in this application is based on the illustrated product structure. Of course, those skilled in the art will understand that the above structure is only a specific example and illustrative illustration, and does not constitute a specific limitation on the technical solution provided in this application.

[0058] like Figures 1 to 10 As shown, the battery pack provided in this application is used in an electric vehicle and includes a housing 1 and battery cells 2 located inside the housing 1. The housing 1 includes a bottom sealing plate 11 and a protective frame located above the bottom sealing plate 11. The protective frame includes a frame 12 and a partition beam 13. The frame 12 surrounds the bottom sealing plate 11 and forms a receiving cavity. The partition beam 13 divides the receiving cavity into multiple battery mounting cavities for mounting the battery cells 2. The housing 1 also includes a lock seat 131, which is equipped with a locking pin 14 so that the battery pack is connected to the chassis of the electric vehicle through the locking pin 14. The partition beam 13 includes a first roll-formed beam body 132, and the lock seat 131 is formed on the top of the first roll-formed beam body 132.

[0059] Specifically, Figures 1 to 4 The illustration shows an embodiment where the housing 1 has an overall rectangular structure, and the receiving cavity is divided into three battery mounting cavities by two partition beams 13. In other embodiments, the housing 1 may also have other structural forms, and the number of partition beams 13 is not limited. The bottom sealing plate 11 can be regarded as a plate-like structure, and the bottom sealing plate 11 is the bottom support component of the entire housing 1, which supports the battery cell 2.

[0060] The first roll-formed beam body 132 is formed by roll forming, which is different from punching, extrusion or die casting manufacturing process. The first roll-formed beam body 132 can be made of high-strength steel and formed by roll forming. Compared with manufacturing the partition beam 13 by using a rectangular tube of a standard part, the roll-formed structure can be adjusted in size as needed, which helps to reduce the overall thickness of the partition beam 13. The roll forming process has high production efficiency and material utilization, which helps to realize the lightweight and cost saving of the box body 1, has relatively high economy, and also helps to give the box body 1 better vibration and mechanical properties. In addition, in the present scheme, the lock seat 131 is no longer a casting fixed on the box body 1 by bolts, but is formed on the top of the first roll-formed beam body 132. In other words, the completion of the roll forming process of the first roll-formed beam body 132 also represents that the lock seat 131 is roll-formed, which greatly simplifies the forming process of the box body 1 and also saves the installation step of the lock seat 131. The roll forming process can improve the fatigue resistance and strength of the lock seat 131. In the preferred scheme in which the first roll-formed beam body 132 is roll-formed by high-strength steel, the fatigue resistance and strength of the lock seat 131 are obviously improved, which greatly reduces the risk of damage to the lock seat 131 and prolongs the service life of the box body 1.

[0061] As a preferred embodiment of the present application, the projection of the first roll-formed beam body 132 on the plane perpendicular thereto is a closed structure. Specifically, taking the roll-formed rectangular steel plate as an example, after roll forming into the required shape, the two free edges of the rectangular steel plate can be connected to other parts that are roll-formed by welding, thereby forming a closure. In the embodiment shown in Figures 4 to 7 In the embodiment shown in

[0062] Further, as shown in Figure 6 and Figure 7As shown, the first roll-formed beam body 132 is provided with a plurality of cavities arranged in sequence in the vertical direction, and the wall of the first roll-formed beam body 132 for enclosing the top cavity forms the lock seat 131. In the technical solution, by providing the first roll-formed beam body 132 with a plurality of cavities, the partition beam 13 can help reduce weight by utilizing the cavities on the basis of meeting the corresponding thickness requirement, and realize lightweight of the battery pack; moreover, the first roll-formed beam body 132 needs to be roll-formed in multiple directions by the base material to form a plurality of cavities, and this multiple-direction winding roll-forming method helps improve the strength and further reduce the risk of deformation. It should be noted that the plurality of cavities of the first roll-formed beam body 132 can be roll-formed by one base material plate, or can be roll-formed by a plurality of base material plates, for example, each steel plate in the plurality of steel plates can be roll-formed to form a cavity, and then the steel plates are connected in sequence in the vertical direction.

[0063] In a specific embodiment, as shown in Figures 4 to 7 The lock seat 131 is provided with a plurality of connection holes 133 arranged at intervals in the length direction, a lock pin 14 is arranged in each connection hole 133, and the top of the lock seat 131 is provided with an escape hole 134 corresponding to the lock pin 14, so that the lock piece on the chassis of the electric vehicle is connected and matched with the lock pin 14 after entering the lock seat 131 through the escape hole 134. Specifically, since the wall of the first roll-formed beam body 132 for enclosing the top cavity forms the lock seat 131, the connection holes 133 are arranged on the walls on both sides of the top cavity, and one lock pin 14 is arranged to connect the two connection holes 133. During the installation of the battery pack, the lock piece can be lifted up by the battery swap trolley to enter the escape hole 134, and then connected and matched with the lock pin 14, thereby improving the convenience of installing the battery pack on the vehicle.

[0064] Further, as shown in Figure 4 and Figure 5 The lock pin 14 is higher than the frame 12 in the vertical direction. Specifically, the lock seat 131 needs to be raised as a whole to lift the lock pin 14 to a position higher than the frame 12, so that the height of the partition beam 13 after roll-forming is greater than the height of the frame 12 as a whole. During the connection and matching of the lock pin 14 with the lock piece on the vehicle, it helps to avoid interference between the frame 12 and other accessories on the electric vehicle, facilitates the hanging and matching of the lock piece with the lock pin 14, reduces the height that needs to be lifted during the installation of the battery pack, and improves the safety of battery swap.

[0065] Further, as shown in Figure 4 and Figure 5As shown, the two ends of the lock seat 131 in the length direction are open and closed by the sealing plate 15. Those skilled in the art can understand that, after the first roll-formed beam body 132 is roll-formed and welded to form a circumferential seal, the two ends of the cavity are in an open state, and the part of the first roll-formed beam body 132 that is lower than the frame 12 can directly close the cavity through the frame 12. However, the lock seat 131 is higher than the frame 12, and the cavity in the lock seat 131 cannot be closed at the two ends through the frame 12. Therefore, the cavity in the lock seat 131 can be closed by the sealing plate 15, and the sealing plate 15 can be welded with the lock seat 131. After the two ends of the lock seat 131 are closed by the sealing plate 15, on the one hand, the structural strength of the lock seat 131 can be improved by the connecting and supporting effect of the sealing plate 15, thereby improving the pressure-bearing capacity and being less prone to deformation. On the other hand, the sealing plate 15 can also prevent dust and dirt from entering the lock seat 131.

[0066] In a preferred embodiment, the first roll-formed beam body 132 includes a plurality of roll-formed sections 1321, and the plurality of roll-formed sections 1321 are sequentially connected from top to bottom. As shown in Figure 7 As shown, it is illustrated that the first roll-formed beam body 132 is connected in the vertical direction by three roll-formed sections 1321, and each roll-formed section 1321 is independently roll-formed to form a plurality of circumferentially sealed cavities. Those skilled in the art can understand that, as the demand for the endurance of electric vehicles increases, the size specifications of the electric cells also gradually increase, and large-specification electric cells require a larger height space. If the partition beam 13 is a single roll-formed structure formed by roll-forming a steel plate, the increase in height will have a negative effect on the strength, thereby reducing the strength and increasing the risk of deformation. Therefore, in the present technical solution, the plurality of roll-formed sections 1321 are sequentially connected from top to bottom to form the first roll-formed beam body 132, which is helpful to improve the strength and reduce the risk of deformation compared to designing the first roll-formed beam body 132 as a single roll-formed structure.

[0067] Further, the adjacent two roll-formed sections 1321 are welded, the two ends of the first roll-formed beam body 132 are welded with the frame 12, and the bottom of the first roll-formed beam body 132 is welded with the bottom sealing plate 11. For example, the adjacent two roll-formed sections 1321 can be welded by resistance welding, and the first roll-formed beam body 132, the frame 12, and the bottom sealing plate 11 can also be welded by resistance welding. In the present technical solution, the roll-formed sections 1321 are connected by welding, the first roll-formed beam body 132 and the frame 12 are connected by welding, and the first roll-formed beam body 132 and the bottom sealing plate 11 are connected by welding, which is helpful to ensure the integrity and structural stability of the box body 1, improve the loading capacity, reduce the risk of deformation, and increase the service life.

[0068] Regarding the structure of the frame 12, as a preferred embodiment of the present application, as shown in Figure 4 , Figure 8 , Figure 9 andFigure 10 As shown in the drawings, the frame 12 includes longitudinal side beams and transverse side beams, the longitudinal side beams include second roll-formed beam bodies 121, and the transverse side beams include third roll-formed beam bodies 122. In this technical solution, the frame 12 is connected and matched by two longitudinal side beams and two transverse side beams to form a rectangular frame structure. Compared with manufacturing the frame 12 by using a rectangular tube of a standard part, the frame 12 is roll-formed, the size can be adjusted as needed, which helps to reduce the overall thickness of the frame 12, the production efficiency and material utilization rate of the roll-forming process are high, which helps to realize the lightweight of the battery box 1 and save manufacturing costs, has relatively high economy, and also helps to give the battery box 1 better vibration and mechanical performance, the fatigue resistance and strength of the frame 12 are obviously improved, the risk of damage is greatly reduced, and the service life of the battery box 1 is improved.

[0069] In a preferred embodiment, as shown in Figure 9 and Figure 10 As shown in the drawings, the projection of the second roll-formed beam body 121 on the plane where the third roll-formed beam body 122 is located is a closed structure, and the projection of the third roll-formed beam body 122 on the plane where the second roll-formed beam body 121 is located is a closed structure. Specifically, taking the roll-forming of the rectangular steel plate into the second roll-formed beam body 121 and the third roll-formed beam body 122 as an example, after the shapes of the second roll-formed beam body 121 and the third roll-formed beam body 122 are roll-formed, the two free edges of the rectangular steel plate can be connected to other parts that are roll-formed by welding to form a closed structure. The second roll-formed beam body 121 forms a plurality of cavities that are circumferentially closed, and the free edges at both ends are folded inward and welded to be closed; the third roll-formed beam body 122 forms a plurality of cavities that are circumferentially closed, and the free edges at both ends are folded inward and welded to be closed. In this technical solution, by making the second roll-formed beam body 121 and the third roll-formed beam body 122 into a circumferentially closed structure, the structural strength can be effectively improved, the compression resistance, tensile resistance and shear resistance can be greatly increased, and the risk of deformation can be reduced.

[0070] In a preferred embodiment, as shown in Figure 9 As shown in the drawings, the second roll-formed beam body 121 is provided with a plurality of cavities arranged in the vertical direction. In this technical solution, by providing the second roll-formed beam body 121 with a plurality of cavities, the longitudinal side beams can help to reduce weight by using the cavities on the basis of meeting the corresponding thickness requirements, and realize the lightweight of the battery pack; moreover, the second roll-formed beam body 121 needs to be roll-formed in multiple directions by the base material to form a plurality of cavities, and this multiple-direction roll-forming method helps to improve the strength and further reduce the risk of deformation. It should be noted that the plurality of cavities of the second roll-formed beam body 121 can be roll-formed by one base material plate, or can be roll-formed by multiple base material plates, for example, each of the multiple steel plates can be roll-formed to form a cavity, and then the steel plates are connected in the vertical direction to form the second roll-formed beam body 121.

[0071] In another preferred embodiment, as shown in Figure 10 In the present technical solution, the third roll-pressed beam body 122 is provided with multiple cavities arranged in sequence in the vertical direction, which helps to reduce weight by utilizing the cavities on the basis of meeting the corresponding thickness requirement, realizes lightweight of the battery pack, helps to improve strength, and further reduces the risk of deformation. Similarly, the multiple cavities of the third roll-pressed beam body 122 can be formed by roll-pressing one base material plate or multiple base material plates, and the base material plate can be a high-strength rectangular steel plate.

[0072] Further, the second roll-pressed beam body 121 includes multiple longitudinal roll-pressed sections 1211 connected in sequence from top to bottom, and the third roll-pressed beam body 122 includes multiple transverse roll-pressed sections 1221 connected in sequence from top to bottom. As shown in Figure 9 and Figure 10 In the present technical solution, the multiple longitudinal roll-pressed sections 1211 are connected in sequence from top to bottom to form the second roll-pressed beam body 121, and the multiple transverse roll-pressed sections 1221 are connected in sequence from top to bottom to form the third roll-pressed beam body 122, which helps to improve strength and reduce the risk of deformation. In a preferred embodiment, the adjacent two longitudinal roll-pressed sections 1211 can be connected by welding, and the adjacent two transverse roll-pressed sections 1221 can be connected by welding, to ensure the integrity and structural stability of the frame 12, reduce the risk of deformation, and increase the service life.

[0073] Further, as shown in the drawings, the bottom of the second roll-pressed beam body 121 is provided with a longitudinal roll-pressed protruding edge 1212 extending into the horizontal receiving cavity, the bottom of the third roll-pressed beam body 122 is provided with a transverse roll-pressed protruding edge 1222 extending into the horizontal receiving cavity, and the bottom sealing plate 11 is connected to the longitudinal roll-pressed protruding edge 1212 and the transverse roll-pressed protruding edge 1222, respectively. By providing the longitudinal roll-pressed protruding edge 1212 and the transverse roll-pressed protruding edge 1222, the frame 12 and the bottom sealing plate 11 can be conveniently connected, especially after the frame 12 and the bottom sealing plate 11 are horizontally butted, the welding can be realized.

[0074] In a preferred embodiment, as shown in Figures 1 to 4 and Figures 8 to 10As shown, the box body 1 further comprises an upper layer bracket 16 covering the battery mounting cavities and used for supporting the battery module, and the frame 12 supports the upper layer bracket 16 together with the partition beams 13. In the embodiment shown in the figure in which two partition beams 13 divide three battery mounting cavities, the upper layer bracket 16 can be covered on the top of each battery mounting cavity. In the technical solution, in addition to that the battery mounting cavities can accommodate the battery cells 2, the upper layer bracket 16 can also support the battery cells 2, so that the battery cells 2 are arranged in layers on the box body 1, the installation space is fully utilized, the number of the battery cells 2 that can be accommodated by one box body 1 is increased, and the cruising range of the electric vehicle is greatly improved.

[0075] Further, as shown in Figure 2 、 Figure 3 、 Figure 4 、 Figure 8 and Figure 10 , the first roller pressing beam body 132 is provided with a first longitudinal roller pressing recessed part 1322, the second roller pressing beam body 121 is provided with a second longitudinal roller pressing recessed part 1213, and the third roller pressing beam body 122 is provided with a transverse roller pressing recessed part 1223, and the first longitudinal roller pressing recessed part 1322, the second longitudinal roller pressing recessed part 1213 and the transverse roller pressing recessed part 1223 together support the upper layer bracket 16. In the technical solution, the first longitudinal roller pressing recessed part 1322, the second longitudinal roller pressing recessed part 1213 and the transverse roller pressing recessed part 1223 are formed by a roller pressing process, and have simple structure and high strength. By using the first longitudinal roller pressing recessed part 1322, the second longitudinal roller pressing recessed part 1213 and the transverse roller pressing recessed part 1223 to support the upper layer bracket 16, high support stability is achieved.

[0076] The places not described in the present application can be implemented or referred to the existing technology.

[0077] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment mainly describes the differences from other embodiments.

[0078] The above only describes the embodiments of the present application and is not used to limit the present application. The present application can have various changes and modifications for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A battery pack applied to an electric vehicle, comprising a box body and a battery cell located in the box body, characterized in that, The box body comprises a bottom cover plate and a surrounding frame arranged above the bottom cover plate, the surrounding frame comprises a frame and a partition beam, the frame surrounds the bottom cover plate and forms a containing cavity, and the partition beam divides the containing cavity into a plurality of battery mounting cavities for mounting battery cells. The box body further comprises a lock seat, the lock seat is provided with a lock pin, and the battery pack is connected to the chassis of the electric vehicle through the lock pin; the partition beam comprises a first roll-formed beam body, and the lock seat is formed on the top of the first roll-formed beam body.

2. The battery pack of claim 1, wherein, The first roll-formed beam body is in a closed structure in a plane perpendicular to the first roll-formed beam body.

3. The battery pack of claim 2, wherein, The first roll-formed beam body is provided with a plurality of cavities arranged in a vertical direction, and a wall of the first roll-formed beam body for forming a top cavity forms the lock seat.

4. The battery pack of claim 3, wherein, The lock seat is provided with a plurality of connection holes arranged at intervals in the length direction, each of the connection holes is provided with the lock pin, and the top of the lock seat is provided with a plurality of avoiding holes corresponding to the lock pins, so that the lock piece on the chassis of the electric vehicle is connected and matched with the lock pin after entering the lock seat through the avoiding hole.

5. The battery pack of claim 4, wherein, The lock pin is higher than the frame in the vertical direction.

6. The battery pack of claim 5, wherein, The two ends of the lock seat in the length direction are closed by end plates.

7. The battery pack of claim 3, wherein The first roll-formed beam body comprises a plurality of roll-formed sections connected in sequence from top to bottom.

8. The battery pack of claim 7, wherein, Two adjacent roll-formed sections are welded. The two ends of the first roll-formed beam body are welded to the frame, and the bottom of the first roll-formed beam body is welded to the bottom cover plate.

9. The battery pack of claim 1, wherein, The frame comprises a longitudinal beam and a transverse beam, the longitudinal beam comprises a second roll-formed beam body, and the transverse beam comprises a third roll-formed beam body.

10. The battery pack of claim 9, wherein, The second roll-formed beam body is in a closed structure in a plane where the third roll-formed beam body is located, and the third roll-formed beam body is in a closed structure in a plane where the second roll-formed beam body is located.

11. The battery pack of claim 10, wherein, The second roll-formed beam body is provided with a plurality of cavities arranged in a vertical direction in sequence; And / or The third roll-formed beam body is provided with a plurality of cavities arranged in a vertical direction in sequence.

12. The battery pack of claim 11, wherein, The second roll-formed beam body comprises a plurality of longitudinal roll-formed sections connected in sequence from top to bottom. The third roll-formed beam body comprises a plurality of transverse roll-formed sections connected in sequence from top to bottom.

13. The battery pack of claim 12, wherein, The bottom of the second roll-formed beam body is provided with a longitudinal roll-formed convex edge extending into the containing cavity in a horizontal direction, and the bottom of the third roll-formed beam body is provided with a transverse roll-formed convex edge extending into the containing cavity in a horizontal direction, and the bottom cover plate is connected to the longitudinal roll-formed convex edge and the transverse roll-formed convex edge respectively.

14. The battery pack of claim 9, wherein, The box body further comprises an upper bracket covering the battery mounting cavities and used for supporting battery cells, and the frame and the partition beam support the upper bracket together.

15. The battery pack of claim 14, wherein The first roller-pressed beam body is provided with a first longitudinal roller-pressed recess, the second roller-pressed beam body is provided with a second longitudinal roller-pressed recess, and the third roller-pressed beam body is provided with a transverse roller-pressed recess, and the first longitudinal roller-pressed recess, the second longitudinal roller-pressed recess and the transverse roller-pressed recess together support the upper layer carrier.

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