Edge beam for battery tray, battery tray, battery pack, and vehicle

Abstract

The application discloses a kind of for battery tray's edge beam, battery tray, battery pack and vehicle, edge beam includes: edge beam body, edge beam body defines cavity, edge beam body has partition, partition is in cavity, partition is connected between the top wall and bottom wall of cavity to separate cavity into first subcavity and second subcavity, first subcavity and second subcavity are sequentially arranged in the first direction of edge beam, the cross-sectional area of first subcavity is S1, the cross-sectional area of second subcavity is S2, satisfy relationship formula: 0.8 < S1 / S2 < 1. Therefore, by the edge beam body of the present application, the structural strength, rigidity of edge beam can be improved, also can guarantee battery pack modal is appropriate, subcavity can absorb collision force when being impacted, reduces the size of collision force transmitted to the inside of battery pack, can reduce the risk of edge beam deformation, so as to can prolong the service life of edge beam, battery tray.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a side beam for a battery tray, a battery tray, a battery pack and a vehicle. BACKGROUND

[0002] In the related art, the battery pack is provided with a battery tray, and the battery tray includes a frame, and the frame includes a side beam. The structural strength of the side beam is insufficient, and the stability is poor. The side beam is prone to deformation, which affects the service life of the side beam. When the side beam is impacted, the impact force transmitted to the inside of the battery pack is large, the risk of the battery cells in the battery pack being damaged by impact is high, and the use safety of the battery pack is affected. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a side beam for a battery tray, which can improve the structural strength and rigidity of the side beam, and can also ensure that the modal of the battery pack is appropriate. When the sub-cavity is impacted, the impact force can be absorbed, the size of the impact force transmitted to the inside of the battery pack is reduced, thereby improving the use safety of the battery pack, reducing the risk of deformation of the side beam, and prolonging the service life of the side beam and the battery tray.

[0004] The present application further provides a battery tray.

[0005] The present application further provides a battery pack.

[0006] The present application further provides a vehicle.

[0007] According to the side beam for a battery tray of the present application, the battery tray has a placing groove for placing battery cells, and the side beam includes a side beam body defining a cavity. The side beam body has a partition portion located in the cavity and connected between the top wall and the bottom wall of the cavity to divide the cavity into a first sub-cavity and a second sub-cavity. The first sub-cavity and the second sub-cavity are arranged in sequence in a first direction of the side beam. The cross-sectional area of the first sub-cavity is S1, and the cross-sectional area of the second sub-cavity is S2. The relationship between S1 and S2 satisfies the formula: 0.8 < S1 / S2 < 1.

[0008] According to the side beam for a battery tray of the present application, the side beam body can improve the structural strength and rigidity of the side beam, and can also ensure that the modal of the battery pack is appropriate. The risk of deformation of the side beam can be reduced, thereby prolonging the service life of the side beam and the battery tray. The battery pack can have good impact protection capability under the condition that the battery pack has appropriate modal.

[0009] In some examples of the present application, in the first direction of the edge beam, the first sub-cavity is located between the second sub-cavity and the placing slot.

[0010] In some examples of the present application, the partition is inclinedly connected between the top wall and the bottom wall of the cavity.

[0011] In some examples of the present application, in the direction from the upper end to the lower end of the edge beam, the partition is inclinedly away from the placing slot.

[0012] In some examples of the present application, the cross-sectional shape of the first sub-cavity and the cross-sectional shape of the second sub-cavity are both triangular or trapezoidal.

[0013] In some examples of the present application, the edge beam is configured as an integrally formed piece.

[0014] In some examples of the present application, in the width direction of the edge beam, the cavity has a first side wall disposed away from the placing slot, the first side wall is connected between the top wall and the bottom wall of the cavity, and the first side wall is connected with the partition.

[0015] In some examples of the present application, the lower end of the first side wall is connected with a first connecting portion extending towards the cavity, the first connecting portion is located on the side of the bottom wall of the cavity towards the top wall of the cavity, the first side wall is connected with the bottom wall of the cavity and the partition through the first connecting portion, and the first connecting portion is fixedly connected with the bottom wall of the cavity.

[0016] In some examples of the present application, the cavity has a second side wall close to the placing slot, the second side wall is connected between the top wall and the bottom wall of the cavity, and the second side wall is connected with the partition.

[0017] In some examples of the present application, the upper end of the second side wall is connected with a second connecting portion extending towards the cavity, the second connecting portion is located on the side of the top wall of the cavity towards the bottom wall of the cavity, the second side wall is connected with the top wall of the cavity and the partition through the second connecting portion, and the second connecting portion is fixedly connected with the top wall of the cavity.

[0018] In some examples of the present application, the edge beam comprises a support portion, the support portion is provided on the side of the edge beam body close to the placing slot, and the support portion is used for supporting the battery cell.

[0019] In some examples of the present application, the lower end of the second side wall is connected with a support portion extending towards the placing slot, and the second side wall is connected with the bottom wall of the cavity through the support portion.

[0020] In some examples of the present application, the second side wall is inclinedly connected between the top wall and the bottom wall of the cavity, and the second side wall is inclined toward the placement slot from the upper end to the lower end of the side beam.

[0021] In some examples of the present application, the bottom wall of the cavity has a structural reinforcement portion extending below the support portion in the width direction of the side beam, and the structural reinforcement portion is connected to the end portion of the support portion near the placement slot.

[0022] In some examples of the present application, the structural reinforcement portion is provided with a boss protruding toward the support portion, and the boss is connected to the support portion.

[0023] In some examples of the present application, the cavity has a first side wall disposed away from the placement slot in the width direction of the side beam, and the first side wall is connected between the top wall and the bottom wall of the cavity; the cavity has a second side wall near the placement slot, and the second side wall is connected between the top wall and the bottom wall of the cavity, the top wall of the cavity, the bottom wall of the cavity, the first side wall, and the second side wall collectively define the cavity, and the bottom wall of the cavity extends toward the placement slot to form a support portion for supporting the battery cell.

[0024] The battery tray according to the present application includes the side beam for the battery tray described above.

[0025] The battery tray according to the present application includes a tray bottom plate including a bottom plate body defining a placement slot for placing a battery cell and an extension portion extending along a circumferential edge of the bottom plate body, and a frame including a side beam, a front end beam, and a rear end beam, the side beam being the side beam, the side beam, the front end beam, and the rear end beam being connected to form a mounting space in which the bottom plate body is mounted, the extension portion being disposed above and on the frame in the height direction of the battery tray, and at least one of the side beam, the front end beam, and the rear end beam having a support portion extending toward the inside of the mounting space for supporting the tray bottom plate.

[0026] The battery pack according to the present application includes a battery cell, and a battery tray, the battery tray being the battery tray described above, the battery tray having a placement slot in which the battery cell is placed.

[0027] The vehicle according to the present application includes the battery pack described above.

[0028] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description, taken in conjunction with the following drawings in which:

[0030] Figure 1 is an exploded view of a battery pack according to an embodiment of the present application;

[0031] Figure 2 is a cross-sectional view of a battery pack according to an embodiment of the present application;

[0032] Figure 3 is Figure 2 is an enlarged view of A in FIG. 1;

[0033] Figure 4 is an assembly view of a battery tray and a battery cell according to an embodiment of the present application;

[0034] Figure 5 is a schematic view of a battery tray according to an embodiment of the present application;

[0035] Figure 6 is an exploded view of a battery tray according to an embodiment of the present application;

[0036] Figure 7 is a schematic view of a tray bottom plate of a battery tray according to an embodiment of the present application;

[0037] Figure 8 is a schematic view of a frame of a battery tray according to an embodiment of the present application;

[0038] Figure 9 is a schematic view of a side beam of a battery tray according to an embodiment of the present application;

[0039] Figure 10 is Figure 9 is an enlarged view of B in FIG. 1;

[0040] Figure 11 is a partial enlarged view of an assembly of a battery tray and a battery cell according to an embodiment of the present application;

[0041] Figure 12 is a cross-sectional view of a side beam according to an embodiment of the present application;

[0042] Figure 13 is another embodiment of a side beam according to an embodiment of the present application.

[0043] Reference numerals:

[0044] battery tray 100;

[0045] tray bottom plate 10;

[0046] bottom plate body 11; placement groove 111; pressure receiving area 112; bottom wall 113 of placement groove

[0047] extension 12; avoiding through hole 122; sealing structure 13;

[0048] frame 20; mounting space 21; support part 22;

[0049] edge beam 23; edge beam body 231; partition part 232; top wall of cavity 233; bottom wall of cavity 234; structure reinforcing part 2341;

[0050] sub-cavity 235; first sub-cavity 2351; second sub-cavity 2352;

[0051] first side wall 236; second side wall 237; first connecting part 238; second connecting part 239; boss structure 2391;

[0052] front end beam 24; rear end beam 25; support beam 26; expansion beam 27; bolt hole 28;

[0053] lifting lug structure 30; cover body 40; placement cavity 41;

[0054] battery pack 200; battery cell 201; pressing plate 202; sealing member 203. DETAILED DESCRIPTION

[0055] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0056] The following description is made with reference to the drawings, in which Figures 1-13 The edge beam 23 for the battery tray 100 according to the embodiments of the present application is described below, a plurality of edge beams 23 are connected to form the frame 20 of the battery tray 100, the frame 20 defines the mounting space 21, the battery tray 100 is applied to the battery pack 200, the battery tray 100 has the tray bottom plate 10 for supporting the battery cell 201, and the edge beam 23 is connected to the tray bottom plate 10. The battery tray 100 has the placement groove 111 for placing the battery cell 201.

[0057] As Figures 1-13As shown, according to the edge beam 23 of the embodiment of the present application, the edge beam 23 comprises an edge beam body 231 defining a cavity, the edge beam body 231 has a partition 232 located in the cavity, the partition 232 is connected between a top wall 233 of the cavity and a bottom wall 234 of the cavity, and the partition 232 can divide the cavity into a first sub-cavity 2351 and a second sub-cavity 2352, the first sub-cavity 2351 and the second sub-cavity 2352 are arranged in sequence in a first direction of the edge beam 23, the first direction of the edge beam 23 refers to a width direction of the edge beam 23 or a width direction of the battery tray 100 or a length direction of the battery tray 100, when the battery tray 100 is placed in the placement mode shown in Figure 11 , the width direction of the edge beam 23 refers to the left-right direction shown in Figure 11 . It should be explained that the partition 232 connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity can divide the cavity into a plurality of sub-cavities 235, when the partition 232 divides the cavity into two sub-cavities 235, the two sub-cavities are respectively the first sub-cavity 2351 and the second sub-cavity 2352, when the partition 232 divides the cavity into four sub-cavities 235, the four sub-cavities 235 are arranged in sequence in the first direction of the edge beam 23, and adjacent two sub-cavities 235 constitute the first sub-cavity 2351, and the other adjacent two sub-cavities 235 constitute the second sub-cavity 2352, when the partition 232 divides the cavity into six sub-cavities 235, the six sub-cavities 235 are arranged in sequence in the first direction of the edge beam 23, and adjacent three sub-cavities 235 constitute the first sub-cavity 2351, and the other adjacent three sub-cavities 235 constitute the second sub-cavity 2352, and so on, and the present application takes the example of the partition 232 dividing the cavity into two sub-cavities 235 for illustration.

[0058] The cross-sectional area of the first sub-cavity 2351 is S1, and the cross-sectional area of the second sub-cavity 2352 is S2, which satisfies the relationship: 0.8 < S1 / S2 < 1, and further, 0.8 < S1 / S2 < 0.99. Wherein, the cross-sectional area of the first sub-cavity 2351 refers to the cross-sectional area in the width direction of the edge beam 23, that is, the cross-section of the first sub-cavity 2351 perpendicular to the length direction of the edge beam 23, and the cross-sectional area of the second sub-cavity 2352 refers to the cross-sectional area in the width direction of the edge beam 23, that is, the cross-section of the second sub-cavity 2352 perpendicular to the length direction of the edge beam 23. By separating the cavity into the first sub-cavity 2351 and the second sub-cavity 2352 by the partition 232, the structural strength and rigidity of the edge beam 23 can be improved, and the risk of deformation of the edge beam 23 can be reduced, thereby prolonging the service life of the edge beam 23 and the battery tray 100, and when the sub-cavity 235 far from the mounting space 21 of the battery tray 100 in the first sub-cavity 2351 and the second sub-cavity 2352 is impacted, the sub-cavity 235 subjected to the impact can absorb the impact force, reducing the size of the impact force transmitted to the inside of the battery pack 200, and the risk of the battery cell 201 in the battery pack 200 being damaged can be reduced, thereby improving the use safety of the battery pack 200. At the same time, by 0.8 < S1 / S2 < 1, the modal of the battery pack 200 can be ensured to be appropriate, the probability of resonance of the battery pack 200 can be reduced, and the battery pack 200 can have better collision protection capability under the condition of ensuring that the battery pack 200 has appropriate modal, and the balance between the whole pack modal and the whole vehicle collision protection of the battery pack 200 can be achieved. In some embodiments of the present application, the partition 232 is inclinedly connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, and by being inclinedly connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, the partition 232 can be reliably supported between the top wall 233 of the cavity and the bottom wall 234 of the cavity, the structural strength and rigidity of the edge beam body 231 can be improved, and the structural stability of the edge beam body 231 can also be improved, thereby reducing the risk of deformation of the edge beam 23, and prolonging the service life of the edge beam 23 and the battery tray 100.

[0059] In some embodiments of the present application, as shown in Figure 12 In the first direction of the edge beam 23, the first sub-cavity 2351 is located between the second sub-cavity 2352 and the placement groove 111, that is, the first sub-cavity 2351 is located between the second sub-cavity 2352 and the mounting space 21 of the battery tray 100. Wherein, when the edge beam 23 is placed in the Figure 12 placement manner in the edge beam 23, the left side of the edge beam 23 is the placement groove 111, the left side sub-cavity 235 is the first sub-cavity 2351, and the right side sub-cavity 235 is the second sub-cavity 2352. By arranging the first sub-cavity 2351 and the second sub-cavity 2352 in the width direction of the edge beam 23 in sequence, when the sub-cavity 235 far from the placement groove 111 in the plurality of sub-cavities 235 is impacted, that is,Figure 12 When the second sub-cavity 2352 on the right side is impacted, the impacted second sub-cavity 2352 can absorb the impact force, reduce the impact force transmitted to the inside of the battery pack 200, and reduce the risk of the battery cell 201 being damaged in the battery pack 200, thereby improving the safety of the battery pack 200.

[0060] In addition, in the battery pack 200, the cross-sectional area of the sub-cavity 235 close to the placement groove 111 has a greater impact on the modal of the battery pack 200, that is, the cross-sectional area of the first sub-cavity 2351 has a greater impact on the modal of the battery pack 200, the greater the cross-sectional area S1 of the first sub-cavity 2351, the worse the stiffness of the battery pack 200, the lower the modal of the battery pack 200, and the greater the probability of resonance of the battery pack 200, and the cross-sectional area of the sub-cavity 235 far from the placement groove 111 has a greater impact on the vehicle collision protection, that is, the cross-sectional area of the second sub-cavity 2352 has a greater impact on the vehicle collision protection, the greater the cross-sectional area S2 of the second sub-cavity 2352, the smaller the pressure area of the second sub-cavity 2352, and the smaller the energy that can be absorbed by the side beam 23 when the vehicle collides with external force, and the greater the collision safety risk. Therefore, by making 0.8 < S1 / S2 < 1, the modal of the battery pack 200 can be ensured to be appropriate, the probability of resonance of the battery pack 200 can be reduced, and the battery pack 200 can have better collision protection ability under the condition of having appropriate modal, and the balance between the modal of the battery pack 200 and the vehicle collision protection can be achieved.

[0061] In some embodiments of the present application, as shown in Figure 11 and Figure 12 When the side beam 23 is placed in the placement manner in Figure 11 , from the upper end to the lower end of the side beam 23, the partition portion 232 is inclinedly arranged away from the placement groove 111, which can also be understood as being inclinedly arranged away from the mounting space 21 of the battery tray 100, and can also be understood as being inclinedly extended away from the placement groove 111 from the top to the bottom of the battery tray 100. The partition portion 232 divides the cavity into the first sub-cavity 2351 and the second sub-cavity 2352, which can improve the structural strength of the side beam 23, improve the stability of the side beam 23, thereby improving the supporting capacity of the side beam 23 for the battery cell 201, and further reducing the risk of deformation of the side frame 20.

[0062] In some embodiments of the present application, the partition 232 is vertically connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity. Such an arrangement can make the partition 232 more reliably supported between the top wall 233 of the cavity and the bottom wall 234 of the cavity, can improve the structural strength of the edge beam 23, can improve the stability of the edge beam 23, so as to improve the ability of the edge beam 23 to support the battery cell 201, and can further reduce the risk of deformation of the frame 20.

[0063] In some embodiments of the present application, as shown in Figure 11 and Figure 12 , the cross-sectional shape of the first sub-cavity 2351 and the cross-sectional shape of the second sub-cavity 2352 are both triangular or trapezoidal. Such an arrangement can improve the structural stability of the edge beam 23, can further reduce the risk of deformation of the edge beam 23, and can further prolong the service life of the edge beam 23 and the battery tray 100.

[0064] According to a specific embodiment of the present application, the first sub-cavity 2351 is located on the side of the second sub-cavity 2352 close to the mounting space 21, the cross-sectional shape of the first sub-cavity 2351 is triangular, and further, the triangle is an isosceles triangle or an equilateral triangle, and the bottom wall 234 of the cavity constitutes the bottom wall of the triangle. Such an arrangement can further improve the structural stability of the edge beam 23, can further reduce the risk of deformation of the edge beam 23, and can further prolong the service life of the edge beam 23 and the battery tray 100.

[0065] Further, the included angle between the bottom wall 234 of the cavity and the partition 232 is configured as the bottom angle of the triangle, the angle of the bottom angle is β1, and satisfies the relationship: 50°≤β1≤70°, preferably, β1 is 60°. Such an arrangement can further improve the structural stability of the edge beam 23, can further reduce the risk of deformation of the edge beam 23, and can further prolong the service life of the edge beam 23 and the battery tray 100.

[0066] Further, the top angle of the triangle is α1, and satisfies the relationship: 50°≤α1≤70°, preferably, α1 is 60°. Such an arrangement can set the cross-sectional shape of the first sub-cavity 2351 to be an equilateral triangle. Such an arrangement can further improve the structural stability of the edge beam 23, can further reduce the risk of deformation of the edge beam 23, and can further prolong the service life of the edge beam 23 and the battery tray 100.

[0067] According to another specific embodiment of the present application, as shown in Figure 11 and Figure 12As shown in the drawings, in the width direction of the side beam 23, the first sub-cavity 2351 is located on the side of the second sub-cavity 2352 close to the mounting groove 111, the cross-sectional shape of the first sub-cavity 2351 is set as a trapezoid, further, the bottom wall 234 of the cavity constitutes the bottom wall of the trapezoid, and the included angle between the bottom wall 234 of the cavity and the partition 232 constitutes the bottom angle of the trapezoid of the first sub-cavity 2351, the angle of the bottom angle is β2, and the relationship formula is satisfied: 50°≤β2≤70°, preferably, β2 is 60°, and the setting can further improve the structural stability of the side beam 23, can further reduce the deformation risk of the side beam 23, and can further prolong the service life of the side beam 23 and the battery tray 100.

[0068] Further, as shown in the drawings, Figure 12 The included angle between the two waists of the trapezoid of the first sub-cavity 2351 is α2, and the relationship formula is satisfied: 50°≤α2≤70°, preferably, α2 is 60°, and the setting can further improve the structural stability of the side beam 23, can further reduce the deformation risk of the side beam 23, and can further prolong the service life of the side beam 23 and the battery tray 100.

[0069] In some embodiments of the present application, as shown in the drawings, Figure 12 The cross-sectional shape of the second sub-cavity 2352 is set as a trapezoid, the bottom wall 234 of the cavity constitutes the top wall of the trapezoid of the second sub-cavity 2352, and the top wall 233 of the cavity constitutes the bottom wall of the trapezoid of the second sub-cavity 2352, which can further improve the structural stability of the side beam 23, can further reduce the deformation risk of the side beam 23, and can further prolong the service life of the side beam 23 and the battery tray 100.

[0070] In some embodiments of the present application, the side beam body 231 also has a support part 22 extending towards the mounting groove 111 of the battery tray 100, the support part 22 is located below the tray bottom plate 10, the support part 22 is used to support the battery cell 201 in the tray bottom plate 10, the side beam 23 mainly bears the weight of the battery cell 201, and the tray bottom plate 10 of the battery tray 100 bears a small part of the weight of the battery cell 201, greatly reducing the bearing requirement of the tray bottom plate 10.

[0071] In some embodiments of the present application, as shown in the drawings, Figure 12 And Figure 13As shown, the edge beam 23 is configured as an integral molding. Further, the edge beam 23 can be made of aluminum material, the edge beam 23 can also be made of steel material, but the application is not limited thereto, the edge beam 23 can also be made of other metal materials that have the same effect as steel material, preferably, the edge beam 23 is made of steel material, the edge beam 23 can be roll-formed from steel material, and the edge beam 23 can also be extruded from steel material. Among them, by setting the edge beam 23 as an integral molding, the load-bearing capacity of the edge beam 23 can be improved, and the risk of deformation of the edge beam 23 can be reduced. Moreover, the edge beam 23 made of steel material can withstand high temperature of 1500°C or above, thereby ensuring the integrity of the edge beam 23 when the battery cell 201 is in thermal runaway.

[0072] According to one embodiment of the application, as Figure 10 and Figure 11 shown, in the width direction of the edge beam 23, the cavity has a first side wall 236 arranged away from the placement groove 111, the first side wall 236 is connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, and the first side wall 236 is connected with the partition 232. Further, as Figure 11 shown, the lower end of the first side wall 236 is connected with a first connecting portion 238 extending towards the inside of the cavity, the first connecting portion 238 is located on the side of the bottom wall 234 of the cavity towards the top wall 233 of the cavity, the first side wall 236 is connected with the bottom wall 234 of the cavity and the partition 232 through the first connecting portion 238, and the first connecting portion 238 is fixedly connected with the bottom wall 234 of the cavity, for example, the first connecting portion 238 is welded with the bottom wall 234 of the cavity, and such arrangement can further improve the structural strength of the edge beam 23, and can further improve the stability of the edge beam 23.

[0073] Further, as Figure 10 and Figure 11 shown, in the width direction of the edge beam 23, the cavity has a second side wall 237 close to the placement groove 111, the second side wall 237 is connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, and the second side wall 237 is connected with the partition 232. Further, as Figure 11 shown, the upper end of the second side wall 237 is connected with a second connecting portion 239 extending towards the inside of the cavity, the second connecting portion 239 is located on the side of the top wall 233 of the cavity towards the bottom wall 234 of the cavity, the second side wall 237 is connected with the top wall 233 of the cavity and the partition 232 through the second connecting portion 239, and the second connecting portion 239 is fixedly connected with the top wall 233 of the cavity, for example, the second connecting portion 239 is welded with the top wall 233 of the cavity, the top wall 233 of the cavity, the bottom wall 234 of the cavity, the first side wall 236 and the second side wall 237 together define the cavity, and such arrangement can further improve the structural strength of the edge beam 23, and can further improve the stability of the edge beam 23.

[0074] Further, asFigure 10 and Figure 11 As shown, the side beam 23 includes a support portion 22, which is located on the side of the side beam body 231 near the placement groove 111. The support portion 22 is used to support the battery cell 201. That is, the side beam body 231 is connected to the support portion 22 extending toward the placement groove 111. The support portion 22 is used to support the battery cell 201 in the tray bottom plate 10 of the battery tray 100. The support portion 22 is supported on the lower surface of the tray bottom plate 10 to support the battery cell 201. The side beam 23 bears most of the weight of the battery cell 201, and the tray bottom plate 10 of the battery tray 100 does not bear the weight of the battery cell 201 or only bears a small part of the weight of the battery cell 201, which greatly reduces the load-bearing requirements of the tray bottom plate 10.

[0075] Furthermore, the lower end of the second sidewall 237 is connected to a support portion 22 extending toward the placement groove 111. The support portion 22 can be used to support the tray bottom plate 10, and the second sidewall 237 is connected to the bottom wall 234 of the cavity through the support portion 22. Further, as... Figure 12 As shown, in the width direction of the side beam 23, the bottom wall 234 of the cavity has a structural reinforcement 2341 extending to the lower part of the support 22. The structural reinforcement 2341 is connected to the end of the support 22 near the bottom plate 10. It can also be understood that the structural reinforcement 2341 extends to the lower part of the support 22. The end of the bottom wall 234 of the cavity near the placement groove 111 is connected to the end of the structural reinforcement 2341 near the placement groove 111. Furthermore, the structural reinforcement 2341 is provided with a boss (i.e., boss structure 2391) protruding towards the support 22. The boss structure 2391 is connected to the support 22. This arrangement can further improve the structural strength of the side beam 23 and further improve the stability of the side beam 23.

[0076] Furthermore, the structural reinforcement 2341 is provided with a plurality of boss structures 2391, which are arranged sequentially in the width direction of the side beam 23. At least one of the boss structures 2391 is located below the battery cell 201. This arrangement enables the boss structure 2391 to support the battery cell 201, which can further improve the load-bearing capacity of the frame 20 and reduce the risk of deformation of the support 22.

[0077] According to another embodiment of the invention, such as Figure 13As shown, in the width direction of the side beam 23, the cavity has a first side wall 236 arranged away from the placement groove 111, the first side wall 236 being connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, the cavity has a second side wall 237 close to the placement groove 111, the second side wall 237 being connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, the top wall 233 of the cavity, the bottom wall 234 of the cavity, the first side wall 236 and the second side wall 237 together define the cavity, and the bottom wall 234 of the cavity extends towards the placement groove 111 to form a support portion 22 for supporting the tray bottom plate 10, the support portion 22 being located below the tray bottom plate 10, the support portion 22 extending below the battery cell 201, so that the support portion 22 can support the battery cell 201, and the load-bearing capacity of the side beam 23 can be further improved.

[0078] In some embodiments of the present application, the second side wall 237 is inclinedly connected between the top wall 233 of the cavity and the bottom wall 234 of the cavity, and from the upper end to the lower end of the side beam 23, the second side wall 237 is inclinedly arranged towards the placement groove 111, so that the structural strength of the side beam 23 can be further improved, the stability of the side beam 23 can be further improved, the ability of the side beam 23 to support the battery cell 201 can be further improved, and the risk of deformation of the side frame 20 can be further reduced.

[0079] As shown, Figures 1-13As shown, the battery tray 100 according to the embodiment of the application comprises a tray bottom plate 10 (the tray bottom plate 10 in the above embodiment) and a frame 20 (the frame 20 in the above embodiment). The tray bottom plate 10 comprises a bottom plate body 11 and an extension 12, the bottom plate body 11 defines a placement groove 111 for placing an electric core 201 or a battery module, the application takes the placement groove 111 for placing the electric core 201 as an example for description, the electric core 201 can be adhered in the placement groove 111 by structural glue, further, the placement groove 111 has a placement groove bottom wall 113, the placement groove bottom wall 113 has a pressure receiving area 112 for supporting the electric core 201, the pressure receiving area 112 refers to an area in which the normal projection of the placement groove bottom wall 113 coincides with the normal projection of the electric core 201 in the height direction of the battery tray 100 when the electric core 201 is installed in the placement groove 111, or it can also be understood as the contact area of the electric core 201 and the placement groove bottom wall 113 when the electric core 201 is installed in the placement groove 111, the contact area includes the area in which the electric core 201 directly contacts with the placement groove bottom wall 113 or indirectly contacts with the placement groove bottom wall 113, for example, when there is adhesive or cooling structure between the electric core 201 and the placement groove bottom wall 113, it belongs to the indirect contact of the electric core 201 and the placement groove bottom wall 113, when there is no other object between the electric core 201 and the placement groove bottom wall 113, the electric core 201 directly contacts with the placement groove bottom wall 113, or it can also be understood as the area in which the weight of the electric core 201 directly acts on the placement groove bottom wall 113 is the pressure receiving area 112. The normal projection of the placement groove bottom wall 113, that is, the projection of the placement groove bottom wall 113 in a plane perpendicular to the height direction of the battery tray 100. The normal projection of the electric core 201, that is, the projection of the electric core 201 in a plane perpendicular to the height direction of the battery tray 100.

[0080] When the electric core 201 is installed in the battery tray 100, the electric core 201 is located in the pressure receiving area 112 of the placement groove 111, the extension 12 is arranged along the circumferential edge of the bottom plate body 11, further, the extension 12 is configured as a ring structure, specifically, the extension 12 is configured as a closed loop structure.

[0081] The frame 20 defines a mounting space 21, the bottom plate body 11 is mounted in the frame 20, further, the bottom plate body 11 is fixedly mounted in the frame 20, the bottom plate body 11 can be adhered to the frame 20, the bottom plate body 11 can also be mounted in the frame 20 by bolts, the specific assembly mode of the bottom plate body 11 and the frame 20 is not specifically limited, which is selected according to actual needs. The bottom plate body 11 is mounted in the mounting space 21, the extension 12 is located outside the mounting space 21, in the height direction of the battery tray 100, the extension 12 is located above the frame 20 and is arranged on the frame 20.

[0082] In some embodiments of the present application, as shown in Figure 6 and Figure 8 The frame 20 includes a side beam, a front end beam 24 and a rear end beam 25, at least one of the side beam, the front end beam 24 and the rear end beam 25 is the side beam 23 in the above-mentioned embodiments, the side beam 23, the front end beam 24 and the rear end beam 25 are connected to form the mounting space 21, the connection of the side beam, the front end beam 24 and the rear end beam 25 includes direct connection and indirect connection, for example, taking the connection of the side beam and the front end beam 24 as an example, the side beam and the front end beam 24 can be directly connected, and the side beam and the front end beam 24 can also be indirectly connected through other beams.

[0083] Further, the side beam and / or the front end beam 24 and / or the rear end beam 25 has a support portion 22 extending towards the inside of the mounting space 21, it can also be understood that at least one of the side beam, the front end beam 24 and the rear end beam 25 has a support portion 22 extending towards the inside of the mounting space 21, the support portion 22 is used to support the tray bottom plate 10. Among them, the side beam is provided with two, the rear end beam 25 and the front end beam 24 are each provided with one, when the frame 20 is placed in the manner shown in Figure 8 , the two side beams are arranged apart in the left-right direction in Figure 8 , the front end beam 24 and the rear end beam 25 are connected between the two side beams, the front end beam 24 and the rear end beam 25 are arranged apart in the front-rear direction of the frame 20, so that the front end beam 24, the rear end beam 25 and the two side beams jointly define the mounting space 21. And when the battery cell 201 is placed along the left-right direction in Figure 8 , by arranging the support portion 22 on the side beam, it can be ensured that each battery cell 201 is supported by the support portion 22, the support portion 22 can further support the battery cell 201, and the frame 20 can mainly be used to bear the weight of the battery cell 201, so that the position of the support portion 22 is reasonable. It can be understood that when the battery tray 100 is installed on the vehicle, the width direction of the battery tray 100 can be consistent with the vehicle width direction, and the length direction of the battery tray 100 can be consistent with the vehicle length direction. Of course, the width direction of the battery tray 100 can also be consistent with the vehicle length direction, and the length direction of the battery tray 100 can be consistent with the vehicle width direction.

[0084] Further, the support portion 22 is used to support the pressure receiving area 112 of the tray bottom plate 10. As shown in Figure 6 , Figure 8 and Figure 11 , the present application takes the placement of the battery tray 100 along the up-down direction as an example, after the bottom plate body 11 is installed in the mounting space 21, the extension portion 12 is arranged outside the mounting space 21, in the up-down direction of the battery tray 100, the extension portion 12 is arranged corresponding to the frame 20, specifically, as shown in Figure 11As shown, the extension 12 is located above the frame 20 and is directly opposite the frame 20. In the vertical direction of the battery tray 100, the extension 12 can cover the entire upper surface of the frame 20.

[0085] Among them, such as Figure 11 As shown, when the battery cell 201 is installed in the placement slot 111, the battery cell 201 is located in the pressure area 112. The support part 22 supports the pressure area 112. The weight of the battery cell 201 is supported on the frame 20, which bears most of the weight of the battery cell 201. The tray bottom plate 10 does not bear the weight of the battery cell 201 or bears only a small part of the weight of the battery cell 201, greatly reducing the load-bearing requirements of the tray bottom plate 10. The tray bottom plate 10 can be made of a material with lower strength and thinner thickness. Furthermore, the tray bottom plate 10 is set as a non-metallic part. Furthermore, the tray bottom plate 10 is set as an insulating part. The tray is made of lightweight non-metallic composite material. The base plate 10 can be made of lightweight non-metallic composite material, such as resin and glass fiber. The resin can be epoxy resin or polyurethane, but the invention is not limited to this. The lightweight composite material can also be made of other composite materials that have the same effect as resin and glass fiber. This arrangement can reduce the weight of the tray base plate 10, which is beneficial to the lightweight design of the battery tray 100 and the battery pack 200. Furthermore, the existing tray base plate 10 is made of aluminum. By using non-metallic composite material to make the tray base plate 10, the production cost of the tray base plate 10 can be reduced, which is beneficial to reducing the production cost of the battery tray 100 and the battery pack 200. It should be noted that the tray base plate 10 made of non-metallic composite material has excellent electrical insulation properties. When the vehicle experiences a serious bottoming-out accident, the battery pack 200 will not be subject to high voltage risks such as arcing.

[0086] Furthermore, the tray base plate 10 is constructed as a single molded part. The tray base plate 10 is molded from a lightweight non-metallic composite material. During the molding process, the tray base plate 10 achieves good airtightness after the resin melts, flows, and solidifies. Simultaneously, the molding process ensures that the tray base plate 10 has good flatness and dimensional accuracy, guaranteeing its sealing function. The frame 20 can be formed by metal welding. After welding, only the structural strength and necessary flatness of the welded structure need to be ensured. The welding efficiency is high, improving the production efficiency of the battery tray 100. Since the tray base plate 10 is responsible for sealing, no weld grinding or airtightness testing is required, eliminating the risk of sealing failure due to welding. The tray base plate 10 can be molded from composite materials, resulting in high production efficiency and high mold precision, thus achieving high flatness and reducing the size requirements of the battery cell 201.

[0087] In addition, the existing battery tray 100 does not distinguish the functions of bearing and sealing in the product structure, and the overall bearing and sealing need to be considered at the same time when manufacturing the battery tray 100, which leads to low manufacturing efficiency and yield of the battery tray 100. In the present application, the functions of bearing and sealing are distinguished, the frame 20 is mainly responsible for bearing, and the tray bottom plate 10 mainly undertakes the sealing function, which improves the manufacturing efficiency and yield of the battery tray 100.

[0088] Therefore, by cooperation of the tray bottom plate 10 and the frame 20, the frame 20 mainly bears the weight of the battery cell 201, the tray bottom plate 10 only bears a small part of the weight of the battery cell 201, the tray bottom plate 10 mainly undertakes the sealing function, the thickness of the tray bottom plate 10 can be reduced, the tray bottom plate 10 made of light composite material can be used, which is beneficial to the lightweight design and cost reduction of the battery tray 100 and the battery pack 200, and after the tray bottom plate 10 and the frame 20 are assembled together, there is no risk of sealing failure of the battery tray 100 caused by welding, and there is no need for welding polishing and air tightness detection of the battery tray 100, which improves the production efficiency of the battery tray 100.

[0089] In some embodiments of the present application, the tray bottom plate 10 and the frame 20 are sealingly connected. The frame 20 is provided with bolt holes 28, the bolt holes 28 are a plurality of, the extension part 12 is provided with a plurality of avoiding through holes 122, the plurality of bolt holes 28 and the plurality of avoiding through holes 122 are one-to-one correspondingly arranged, a plurality of pull rivet nuts are pre-buried in the frame 20, the plurality of pull rivet nuts are one-to-one correspondingly arranged with the plurality of bolt holes 28, and the pull rivet nuts pass through the avoiding through holes 122 and the bolt holes 28. The battery pack 200 comprises a cover body 40, the cover body 40 and the tray bottom plate 10 jointly define a placing cavity 41 for placing the battery cell 201, and the cover body 40 is connected with the frame 20. Further, the cover body 40 is arranged on the open end of the placing groove 111 to define the placing cavity 41, the extension part 12 is clamped between the cover body 40 and the frame 20, and the bolt passes through the cover body 40, the avoiding through hole 122 of the extension part 12 and the bolt hole 28 of the frame 20 to be connected with the pull rivet nut, so as to assemble the cover body 40, the tray bottom plate 10 and the frame 20 together. By sealingly connecting the tray bottom plate 10 and the frame 20, the bolt and the bolt hole 28 are sealed, which can improve the sealing property of the battery tray 100, can avoid water vapor flowing into the placing groove 111 from the bolt hole 28 on the frame 20, and can also prevent short circuit of the battery pack 200, thereby improving the safety in use of the battery pack 200.

[0090] In some embodiments of the present application, as shown in Figure 11As shown, the tray bottom plate 10 and the frame 20 are sealingly connected through the sealing structure 13, further, the sealing structure 13 is configured as sealing glue, the sealing structure 13 can also be configured as a rubber piece, but the application is not limited to this, the sealing structure 13 can also be configured as a sealing piece which plays the same role as the sealing glue. The sealing structure 13 can be clamped in the entire space between the tray bottom plate 10 and the frame 20, the sealing structure 13 can be clamped in part of the space between the tray bottom plate 10 and the frame 20, the sealing structure 13 can be arranged around the bolt hole 28 and the avoiding through hole 122, further, the sealing structure 13 can extend into the bolt hole 28 and the avoiding through hole 122, such arrangement can realize the sealing connection between the tray bottom plate 10 and the frame 20, and can effectively prevent water vapor from flowing into the placement cavity 41 from the bolt hole 28 on the frame 20.

[0091] In some embodiments of the application, as shown in Figure 11 The sealing structure 13 is arranged between the extension 12 and the frame 20, and because the avoiding through hole 122 is arranged at the extension 12, by arranging the sealing structure 13 between the extension 12 and the frame 20, the sealing structure 13 can seal the bolt hole 28 and the avoiding through hole 122, and the arrangement position of the sealing structure 13 can be reasonable.

[0092] In some embodiments of the application, as shown in Figure 11 When the battery tray 100 is placed in the placement mode shown in Figure 11 In the height direction of the battery tray 100, the normal projection of the support portion 22 and the normal projection of the pressure receiving area 112 have an overlapping area, and after the battery cell 201 is placed in the placement groove 111, such arrangement can ensure that the support portion 22 supports the battery cell 201, and can ensure that the frame 20 is mainly used for bearing the weight of the battery cell 201.

[0093] In some embodiments of the application, the bottom wall 113 of the placement groove 111 is formed with the pressure receiving area 112, and it can also be understood that the pressure receiving area 112 is arranged at the bottom wall 113 of the placement groove 111, as shown in Figure 11 When the battery tray 100 is placed in the placement mode shown in Figure 11 The support portion 22 is located below the bottom plate body 11 and is supported on the bottom wall 113, such arrangement can ensure that the support portion 22 is supported below the pressure receiving area 112, can further ensure that the support portion 22 supports the battery cell 201, and can further ensure that the frame 20 is mainly used for bearing the weight of the battery cell 201, so that the arrangement position of the pressure receiving area 112 is reasonable.

[0094] In some embodiments of the application, as shown in Figure 8As shown, the frame 20 further comprises a support beam 26, which is connected between two side beams 23, or connected between the front end beam 24 and the rear end beam 25, or connected between the front end beam 24 and the side beam 23, or connected between the rear end beam 25 and the side beam 23, which can improve the structural strength of the frame 20, and thus improve the structural strength of the battery tray 100.

[0095] In some embodiments of the present application, as shown in Figure 5 and Figure 6 , the battery tray 100 further comprises an expansion beam 27, which is arranged on the side of the tray bottom plate 10 away from the frame 20, and is arranged above the tray bottom plate 10 when the battery tray 100 is placed in the manner as shown in Figure 5 and Figure 6 , and the expansion beam 27 is bolted to the support beam 26, and can limit the expansion of the battery cell 201 after the battery cell 201 is installed in the placement groove 111, thereby improving the safety of the battery cell 201.

[0096] Further, the support beam 26 is provided in a plurality, and the plurality of support beams 26 are arranged in sequence and spaced apart along the length direction of the side beam 23, which refers to the front-rear direction in Figure 6 , and the expansion beam 27 is provided in a plurality, and the plurality of expansion beams 27 are arranged in sequence and spaced apart along the length direction of the side beam 23, and the plurality of expansion beams 27 and the plurality of support beams 26 are arranged one-to-one, and one expansion beam 27 is bolted to one support beam 26, so that the expansion beam 27 can be stably installed on the frame 20.

[0097] In some embodiments of the present application, as shown in Figure 11 , the support portion 22 is arranged close to the lower end of the side beam 23, or it can also be understood that the support portion 22 is arranged close to the end of the side beam 23 away from the tray bottom plate 10, and after the bottom plate body 11 is installed in the installation space 21, by arranging the support portion 22 close to the end of the side beam 23 away from the tray bottom plate 10, it can be ensured that the support portion 22 is supported below the bottom plate body 11, and it can also be ensured that the bottom plate body 11 can be installed in the installation space 21.

[0098] In some embodiments of the present application, as shown in Figures 5-7 , Figure 11 , when the battery tray 100 is placed in the manner as shown in Figure 11 , the upper end of the placement groove 111 is open, and the battery cell 201 can be placed into the placement groove 111 from the open end of the placement groove 111. Furthermore, the extension portion 12 is arranged to extend circumferentially along the open end of the placement groove 111, as shown in Figure 11As shown, the extension part 12 is connected with the upper end of the bottom plate body 11, after the bottom plate body 11 is installed in the installation space 21, the extension part 12 is arranged outside the placing groove 111, which can ensure that the extension part 12 is arranged corresponding to the frame 20 in the up-down direction of the battery tray 100, thereby ensuring the sealing of the battery tray 100.

[0099] In some embodiments of the present application, as shown in Figure 8 、 Figure 10 and Figure 11 , the surface of the support part 22 close to the tray bottom plate 10 is configured as a plane, that is, as shown in Figure 11 , the upper surface of the support part 22 is configured as a plane, which can ensure the support area of the support part 22 and the bottom plate body 11, and can better support the battery cell 201.

[0100] In some embodiments of the present application, the support part 22 is located below the bottom plate body 11 and is fixedly connected with the bottom plate body 11. Further, the tray bottom plate 10 is bonded to the frame 20. Further, the support part 22 and the bottom plate body 11 are bonded and connected by a bonding agent (such as a structural adhesive) between the tray bottom plate 10 and the frame 20, and the thickness of the bonding agent is used to control the dimensional tolerance of the frame 20, and the tray bottom plate 10 has good flatness, and the bonding agent can be used to absorb the tolerance to reduce the manufacturing requirements of the tray bottom plate 10 and the frame 20. Moreover, when the existing tray bottom plate 10 and the frame 20 are welded, the tray bottom plate 10 is easily deformed during the welding process, which increases the size requirements of the battery cell 201 during the subsequent assembly process of the battery pack 200, affecting the assembly efficiency of the battery pack 200. In the present application, the tray bottom plate 10 and the frame 20 are bonded and connected to avoid welding connection, which can prevent the tray bottom plate 10 from deforming, reduce the size requirements of the battery cell 201 during the subsequent assembly process of the battery pack 200, and improve the assembly efficiency of the battery pack 200.

[0101] In some embodiments of the present application, the tray bottom plate 10 is configured as an integrally formed part, and the tray bottom plate 10 is molded by a light composite material, which forms good airtightness after the resin melts and flows during the molding process. At the same time, the tray bottom plate 10 can have good flatness and dimensional accuracy through molding by a mold part, thereby ensuring the sealing function of the tray bottom plate 10.

[0102] In some embodiments of the present application, the frame 20 is configured as a metal piece, which can be made of aluminum material, or can be made of steel material, but the present application is not limited thereto, and the frame 20 can also be made of other metal materials having the same effect as the steel material. Preferably, the frame 20 is made of steel material, which can be formed by rolling or extruding.

[0103] In some embodiments of the present application, as shown in Figure 5 and Figure 6 , the frame 20 is connected with a lifting lug structure 30, which is provided with a mounting hole. The lifting lug structure 30 is mounted on the vehicle by a fastener (such as a bolt), so as to achieve the purpose of mounting the battery pack 200 on the vehicle.

[0104] As shown in Figures 1-11 , the battery pack 200 according to the embodiments of the present application comprises a battery cell 201, a battery tray 100 and a cover 40. The battery tray 100 is the battery tray 100 of the above-mentioned embodiments, which has a placing groove 111, and the battery cell 201 is placed in the placing groove 111. The cover 40 and the tray bottom plate 10 jointly define a placing cavity 41 for placing the battery cell 201, and the cover 40 is connected with the frame 20. Further, the cover 40 is arranged on the open end of the placing groove 111 to define the placing cavity 41, and the extension 12 is clamped between the cover 40 and the frame 20. The cover 40, the tray bottom plate 10 and the frame 20 are assembled together by using a bolt to pass through the cover 40, the extension 12 and the frame 20. Further, a sealing member 203 (such as a sealing ring) is clamped between the extension 12 and the cover 40, which can seal the placing cavity 41. The cover 40 and the tray bottom plate 10 define a sealed and insulated cavity (i.e. the placing cavity 41). After the battery cell 201 is placed in the placing cavity 41, the battery cell 201 can be completely isolated from the frame 20, and the battery cell 201 is in a completely insulated environment, so that the battery pack 200 has no risk of electric leakage.

[0105] In some embodiments of the present application, as shown in Figure 1 , the battery pack 200 can further comprise a pressing plate 202 configured as a closed loop structure. The cover 40, the sealing member 203 and the extension 12 are clamped between the pressing plate 202 and the frame 20. The pressing plate 202, the cover 40, the extension 12 and the frame 20 are assembled together by using a bolt to pass through the pressing plate 202, the cover 40, the extension 12 and the frame 20. The pressing plate 202 can uniformly press the entire sealing member 203, so as to ensure that the placing cavity 41 is reliably sealed.

[0106] The vehicle according to the embodiment of the present application comprises the battery pack 200 of the above-mentioned embodiments, the battery pack 200 is installed on the vehicle to provide electric energy for the vehicle, the frame 20 of the battery pack 200 bears most of the weight of the battery cell 201, the tray bottom plate 10 only bears a small part of the weight of the battery cell 201, and the tray bottom plate 10 mainly undertakes the sealing function, so that the tray bottom plate 10 made of the light composite material can be used, which is beneficial to the lightweight design and cost reduction of the battery tray 100, the battery pack 200 and the vehicle, and after the tray bottom plate 10 and the frame 20 are assembled together, there is no risk of sealing failure of the battery tray 100 caused by welding, and there is no need to polish the weld and detect the air tightness of the battery tray 100, so that the production efficiency of the battery tray 100 and the vehicle is improved. At the same time, the tray bottom plate 10 made of the composite material has excellent electric insulation performance, so that when the vehicle has a serious grounding accident, the battery pack 200 will not have high-voltage risks such as arc drawing, and the safety of the vehicle is improved.

[0107] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above-mentioned terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0108] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A side beam for a battery tray having a placement slot for placing a battery cell, characterized by, The side beam comprises: a side beam body defining a cavity, the side beam body having a partition located in the cavity, the partition being connected between a top wall and a bottom wall of the cavity to separate the cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity being arranged in sequence in a first direction of the side beam, a cross-sectional area of the first sub-cavity being S1, a cross-sectional area of the second sub-cavity being S2, and satisfying a relationship: 0.8 In a width direction of the side beam, the cavity has a first side wall disposed away from the placement slot, the first side wall being connected between the top wall and the bottom wall of the cavity, and the first side wall being connected with the partition. A lower end of the first side wall is connected with a first connecting portion extending towards the cavity, the first connecting portion being located on a side of the bottom wall of the cavity towards the top wall of the cavity, the first side wall being connected with the bottom wall of the cavity and the partition through the first connecting portion, and the first connecting portion being fixedly connected with the bottom wall of the cavity. In the first direction of the side beam, the first sub-cavity is located between the second sub-cavity and the placement slot.

2. The rim for a battery tray of claim 1, wherein, The partition is obliquely connected between the top wall and the bottom wall of the cavity.

3. The rim for a battery tray of claim 2, wherein, From an upper end to a lower end of the side beam, the partition is obliquely inclined towards away from the placement slot.

4. The rim for a battery tray of claim 1, wherein, The cross-sectional shape of the first sub-cavity and the cross-sectional shape of the second sub-cavity are both triangular or trapezoidal.

5. The rim for a battery tray of claim 1, wherein, The side beam is configured as an integrally formed member.

6. The rim for a battery tray of claim 1, wherein, The cavity has a second side wall close to the placement slot, the second side wall being connected between the top wall and the bottom wall of the cavity, and the second side wall being connected with the partition.

7. The rim for a battery tray of claim 6, wherein, An upper end of the second side wall is connected with a second connecting portion extending towards the cavity, the second connecting portion being located on a side of the top wall of the cavity towards the bottom wall of the cavity, the second side wall being connected with the top wall of the cavity and the partition through the second connecting portion, and the second connecting portion being fixedly connected with the top wall of the cavity.

8. The rim for a battery tray of claim 7, wherein, The side beam comprises a support portion provided on a side of the side beam body close to the placement slot, the support portion being used for supporting the battery cell.

9. The rim for a battery tray of claim 8, wherein, A lower end of the second side wall is connected with a support portion extending towards the placement slot, the second side wall being connected with the bottom wall of the cavity through the support portion.

10. The rim for a battery tray of claim 6, wherein, The second side wall is obliquely connected between the top wall and the bottom wall of the cavity, and from the upper end to the lower end of the side beam, the second side wall is obliquely inclined towards close to the placement slot.

11. The rim for a battery tray of claim 9, wherein, In the width direction of the side beam, the bottom wall of the cavity has a structural reinforcement portion extending below the support portion, the structural reinforcement portion being connected with an end of the support portion close to the placement slot.

12. The rim for a battery tray of claim 11, wherein, The structural reinforcement portion is provided with a boss protruding towards the support portion, the boss being connected with the support portion.

13. The rim for a battery tray of any one of claims 1-5, wherein, The cavity has a second side wall close to the placement slot, the second side wall being connected between the top wall and the bottom wall of the cavity, the top wall of the cavity, the bottom wall of the cavity, the first side wall and the second side wall together defining the cavity, and the bottom wall of the cavity extending towards the placement slot to form a support portion for supporting the battery cell.

14. A battery tray characterized by, The battery tray comprises the side beam according to any one of claims 1-13.

15. The battery tray of claim 14, wherein, The battery tray comprises: a tray bottom plate comprising a bottom plate body and an extension portion, the bottom plate body defining a placement slot for placing a battery cell, the extension portion extending along a circumferential edge of the bottom plate body; a frame comprising a side beam, a front end beam and a rear end beam, at least one of the side beam, the front end beam and the rear end beam being the side beam, the side beam, the front end beam and the rear end beam being connected to form a mounting space in which the bottom plate body is mounted, the extension portion being located above and provided on the frame in a height direction of the battery tray, at least one of the side beam, the front end beam and the rear end beam having a support portion extending towards the mounting space, the support portion being used for supporting the tray bottom plate.

16. A battery pack, characterized by The battery pack comprises a battery cell and the battery tray according to claim 14 or 15, the battery tray having a placement slot, the battery cell being placed in the placement slot.

17. A vehicle characterized by comprising: The battery pack comprises the battery tray according to claim 16.

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