Battery frame, power battery and vehicle

Abstract

The application discloses a battery frame, a power battery and a vehicle, wherein the battery frame comprises a bottom plate and side edge beams located at opposite sides of the bottom plate, the side edge beams comprise edge beam parts extending along the height direction of the bottom plate, connecting parts located at the inner sides of the edge beam parts and connected with the bottom plate, and fixing parts located at the outer sides of the edge beam parts and used for being connected with the vehicle rocker beams; the edge beam part comprises an edge beam upper part and an edge beam lower part, the edge beam upper part is located above the edge beam lower part, the outer side of the edge beam lower part is connected with the fixing part, the inner side of the edge beam lower part is connected with the connecting part, the edge beam lower part is provided with a first cavity, the bottom wall of the first cavity of the edge beam lower part is thinned, and the thickness of the bottom wall of the first cavity is smaller than the thickness of the side wall of the first cavity. The technical scheme can increase the cell capacity of the power battery pack and ensure the safety of the cells in the side collision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, in particular to a battery frame, a power battery and a vehicle. BACKGROUND

[0002] The power battery of a pure electric vehicle is usually arranged under the floor between the front and rear subframes. The front and rear parts of the battery are protected by the subframes, so the front and rear collisions have relatively small damage to the power battery. The side part is only protected by the rocker beam and the battery side beam structure, so the side collision is more likely to cause greater impact on the battery. In order to avoid the impact of the side beam on the battery during side collision, a space distance is reserved between the battery cell and the side beam, thereby reducing the risk of hitting the battery cell during side collision.

[0003] However, in order to alleviate the travel anxiety of electric vehicle owners, major automakers are now trying to increase the battery capacity, and one effective solution is to expand the battery cell boundary to increase the battery capacity. However, due to the influence of the overall vehicle width, expanding the battery boundary will further shorten the distance between the overall vehicle boundary and the battery cell, increasing the risk of hitting the battery cell during side collision.

[0004] At present, the above problems are generally solved by strengthening the rocker beam and the battery side beam. Although strengthening the structure of the rocker beam and the battery side beam can protect the battery cell to some extent, on the one hand, it increases the weight of the vehicle and the battery frame, which does not meet the requirements of lightweight design; on the other hand, the problem of hitting the battery cell during side collision still exists and has not been well solved. SUMMARY

[0005] The main purpose of the present application is to provide a battery frame which can increase the capacity of the battery cell while ensuring the safety of the battery cell during side collision.

[0006] To achieve the above purpose, the battery frame provided by the present application comprises:

[0007] a bottom plate; and

[0008] a side beam located on opposite sides of the bottom plate, the side beam comprising a side beam portion extending in the height direction of the bottom plate, a connecting portion located on the inner side of the side beam portion and connected to the bottom plate, and a fixing portion located on the outer side of the side beam portion and connected to the rocker beam of the vehicle.

[0009] The side beam portion comprises a side beam upper portion and a side beam lower portion, the side beam upper portion is located above the side beam lower portion, the outer side of the side beam lower portion is connected to the fixing portion, and the inner side of the side beam lower portion is connected to the connecting portion. The side beam lower portion is provided with a first cavity, the bottom wall of the first cavity of the side beam lower portion is thinned, and the thickness of the bottom wall of the first cavity is less than the thickness of the side wall of the first cavity.

[0010] Optionally, the battery frame further comprises a protective plate, and a bottom wall of the first cavity is provided with a mounting position, and the protective plate is detachably fixed to the mounting position.

[0011] Optionally, the protective plate is fixed to the mounting position by a fastener, and the mounting position is formed with a groove along a penetrating direction of the fastener, and a head of the fastener is arranged in the groove.

[0012] Optionally, the connecting portion is provided with a second cavity.

[0013] Optionally, a wall thickness of the second cavity is greater than or equal to a side wall thickness of the first cavity.

[0014] Optionally, the upper portion of the side beam is provided with a third cavity, and the third cavity is provided with a reinforcing structure.

[0015] Optionally, the reinforcing structure comprises a plurality of reinforcing ribs distributed in the third cavity, the plurality of reinforcing ribs are arranged between two side walls of the third cavity in an inclined manner, and the plurality of reinforcing ribs separate the third cavity to form a plurality of sub-cavities.

[0016] Optionally, a side wall thickness of the third cavity is less than a side wall thickness of the first cavity.

[0017] Optionally, a connection between the fixing portion and the lower portion of the side beam is inclined.

[0018] Optionally, the fixing portion comprises a sink groove formed by a bottom recess, a fastener penetrates through the fixing portion and the vehicle rocker beam to be fixed, and a head of the fastener is arranged in the sink groove.

[0019] Optionally, the side beam is integrally extruded.

[0020] The application further provides a power battery comprising a battery frame and a battery cell module.

[0021] Optionally, the power battery further comprises a protective layer arranged between the battery cell module and the battery frame.

[0022] The application further provides a vehicle comprising a vehicle body and a power battery as described above, two fixing portions are respectively connected to rocker beams of the vehicle body, and the rocker beams are provided with cavity structures.

[0023] Optionally, the rocker beam is integrally extruded.

[0024] The technical scheme of the present application adopts a bottom plate and side edge beams, the side edge beams are located on opposite sides of the bottom plate, the side edge beams comprise an edge beam part extending along the height direction of the bottom plate, a connecting part connected with the bottom plate on the inner side of the edge beam part, and a fixing part connected with the vehicle rocker beam on the outer side of the edge beam part; wherein the edge beam part comprises an edge beam upper part and an edge beam lower part, the edge beam upper part is located above the edge beam lower part, the outer side of the edge beam lower part is connected with the fixing part, and the inner side of the edge beam lower part is connected with the connecting part, the edge beam lower part is provided with a first cavity, the bottom wall of the first cavity of the edge beam lower part is thinned, and the thickness of the bottom wall of the first cavity is smaller than the thickness of the side wall of the first cavity. The bottom wall of the first cavity of the edge beam lower part is thinned, so that the thickness of the bottom wall of the first cavity is smaller than the thickness of the side wall of the first cavity, the structure of the side edge beam is changed, and when the side edge beam is deformed in a collision, the side edge beam is bent at the thinned part, so that the side edge beam is extruded and deformed in an obliquely upward direction during the collision process, and the impact force is reduced when the battery frame and the rocker beam connection position collapse directly to the direction of the battery cell. In particular, the battery frame is applied to the vehicle rocker beam improved by the present application, the collision force is weakened through the rocker beam, the safety of the battery cell during side collision is further ensured, and the protection effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the drawings shown.

[0026] Figure 1 The cross-sectional structure schematic diagram of an embodiment of the present application in which the power battery is installed on the rocker beam;

[0027] Figure 2 The structure schematic diagram of an embodiment of the battery frame; Figure 1

[0028] Figure 3 The cross-sectional structure schematic diagram of an embodiment of the side edge beam; Figure 1

[0029] The structure schematic diagram of the rocker beam in which the rocker beam collapses during side collision; Figure 4 Figure 1 The schematic diagram of the collapse direction of the side edge beam in which the side edge beam collapses.

[0030] Figure 5 Figure 4

[0031] Explanation of reference numerals:

[0032] ​​​​

[0033]

[0034] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments in combination with the accompanying drawings. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0036] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications also change accordingly.

[0037] In addition, the descriptions involving “first”, “second” and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0038] The power battery of the pure electric vehicle is usually arranged under the floor between the front and rear subframes. The front and rear parts of the battery are protected by the subframes, so the front and rear collisions have relatively small damage to the power battery. Only the rocker beam and the battery side beam structure protect the side, so the side collision is more likely to cause greater impact on the battery. In order to avoid the impact of the side beam on the battery during side collision, a space distance is reserved between the battery cell and the side beam, reducing the risk of hitting the battery cell during side collision.

[0039] However, in order to alleviate the travel anxiety of electric vehicle owners, major automakers are now trying to improve the battery capacity, among which expanding the battery cell boundary to increase the battery capacity is an effective solution. However, due to the influence of the overall vehicle width, expanding the battery boundary will further shorten the distance between the overall vehicle boundary and the battery cell, increasing the risk of hitting the battery cell during side collision.

[0040] At present, the above problems are generally solved by strengthening the rocker and the battery side beam. Although the structure strength of the rocker and the battery side beam can protect the battery cell to some extent, on the one hand, the weight of the vehicle and the battery frame is increased, which does not meet the requirement of lightweight design; on the other hand, the problem of the battery cell being hit during side collision still exists and has not been well solved.

[0041] Therefore, with reference to Figures 1 to 3 , the present application provides a vehicle, wherein a power battery 200 is installed under the floor, and the power battery 200 is connected with a rocker 100 of the vehicle. When the vehicle is subjected to side collision, the collision force first hits the rocker 100, and the rocker 100 absorbs part of the energy during the collision process. The remaining energy is transmitted to other areas of the vehicle body through the seat cross beam in the transverse direction of the vehicle body floor. Another part of the energy is mainly transmitted to the battery bottom frame through the side beam 320 of the battery frame 300, and then transmitted to the structure of the vehicle body on the other side.

[0042] With reference to Figure 1 , in order to reduce the impact force during side collision and ensure lightweight, in the embodiment, the rocker 100 is composed of an aluminum extruded beam, that is, the rocker 100 is integrally extruded from aluminum. The rocker 100 is a hollow structure 110, which is similar to a nine-space structure. The multiple space structures ensure the absorption of the collision force. During the collision process, the rocker 100 will produce collapse deformation, thereby reducing the side collision force.

[0043] With reference to Figures 1 to 3 , the present application also provides a power battery 200, which comprises a battery cell module 400 and a battery frame 300 for installing the battery cell module 400. The battery frame 300 comprises a front and rear beam bottom plate 310 and two side beams 320. The battery cell module 400 is arranged in the battery frame 300. The battery cell module 400 comprises a battery cell group 410 and a cooling assembly 420. The cooling assembly 420 comprises a liquid cooling plate 421 and a water pipe 422. The cooling assembly 420 is arranged between the battery cell group 410 and the battery frame 300. The collision requirement of the power battery 200 is that the deformation of the battery frame 300 cannot hit the battery cell group 410, the battery cell group 410 cannot be deformed, and the cooling assembly 420 in the battery frame 300 cannot be hit, and the cooling liquid in the cooling assembly 420 cannot flow out.

[0044] With reference to Figure 4 and Figure 5To this end, the battery frame 300 is also improved in the application to solve the problem of increasing the capacity of the power battery 200 while ensuring safety in side collision. Specifically, in an embodiment of the application, the battery frame 300 includes a bottom plate 310 and side beams 320 located on both sides of the bottom plate 310. The side beams 320 include a beam portion 330 extending in the height direction of the bottom plate 310, a connecting portion 360 connected to the bottom plate 310 on the inner side of the beam portion 330, and a fixing portion 370 connected to the vehicle rocker beam 100 on the outer side of the beam portion 330. In order to increase the capacity of the power battery 200 while ensuring the safety of the battery cell in side collision, the beam portion 330 includes an upper beam portion 340 and a lower beam portion 350. The upper beam portion 340 is located above the lower beam portion 350. The outer side of the lower beam portion 350 is connected to the fixing portion 370, and the inner side of the lower beam portion 350 is connected to the connecting portion 360. The lower beam portion 350 is provided with a first cavity 351. The bottom wall 353 of the first cavity 351 of the lower beam portion 350 is thinned, so that the thickness of the bottom wall 353 of the first cavity 351 is less than the thickness of the side wall of the first cavity 351. The structure of the side beam 320 is changed. In the process of collision deformation, the side beam 320 is induced to bend at the thinned portion, so that the side beam 320 bends in the oblique direction of the battery frame 300 during the collision process, avoiding the battery frame 300 from directly extruding in the direction of the battery cell when the connection position of the battery frame 300 and the rocker beam 100 collapses, and reducing the impact force. In particular, the improved vehicle rocker beam 100 cooperates to weaken the impact force, further ensuring the safety of the battery cell in side collision.

[0045] The technical scheme of the present application adopts the bottom plate 310 and the side beam 320, the side beam 320 is located on the opposite sides of the bottom plate 310, the side beam 320 includes the side beam part 330 extending along the height direction of the bottom plate 310, the connecting part 360 connected with the bottom plate 310 on the inner side of the side beam part 330, and the fixing part 370 connected with the vehicle rocker beam 100 on the outer side of the side beam part 330; wherein the side beam part 330 includes the side beam upper part 340 and the side beam lower part 350, the side beam upper part 340 is located above the side beam lower part 350, the outer side of the side beam lower part 350 is connected with the fixing part 370, and the inner side is connected with the connecting part 360, the side beam lower part 350 is provided with the first cavity 351, the bottom wall 353 of the first cavity 351 of the side beam lower part 350 is thinned, and the thickness of the bottom wall 353 of the first cavity 351 is smaller than the thickness of the side wall of the first cavity 351. The bottom wall 353 of the first cavity 351 of the side beam lower part 350 is thinned, so that the thickness of the bottom wall 353 of the first cavity 351 is smaller than the thickness of the side wall of the first cavity 351, the structure of the side beam 320 is changed, and in the collision deformation, the side beam 320 is induced to bend at the thinned part, so that the side beam 320 bends in the oblique upward direction of the battery frame 300 during the collision process, avoiding the direct extrusion of the battery frame 300 to the direction of the battery cell when the connection position of the battery frame 300 and the rocker beam 100 collapses, and reducing the impact force. In particular, the improved vehicle rocker beam 100 cooperates to weaken the collision force, further ensuring the safety of the battery cell in the side collision.

[0046] The side beam 320 deforms at the thinned part of the bottom of the side beam 320, so that the bottom starts to deform during the side collision process, so that the side beam 320 moves in the oblique upward direction, reduces the impact force on the battery cell, and changes the deformation direction of the side beam 320, so that the capacity of the battery cell group 410 in the battery frame 300 is increased by expanding the boundary of the battery cell.

[0047] Referring to Figure 1 and Figure 3 Further, in order to reduce the mass of the battery frame 300 and facilitate light weight, the connecting part 360 is provided with the second cavity 361.

[0048] Further, in order to solve the problem of increasing the capacity of the power battery 200 while ensuring safety in side collision, the wall thickness of the second cavity 361 is greater than or equal to the side wall thickness of the first cavity 351. As described above, in the collision, a part of the energy is transmitted from the side beam 320 to the battery bottom frame, and then to the body structure on the other side. By strengthening the strength of the connection between the bottom plate 310, the impact force is better transmitted, and the deformation effect is also ensured. The connection part 360 is provided with the second cavity 361 to strengthen the connection between the battery side beam 320 and the bottom plate 310. The bottom plate 310 is fixed by welding with the connection part 360. The wall thickness of the transverse structure of the second cavity 361 is greater than that of the bottom wall 353 of the first cavity 351, so that the side beam 320 is not easy to deform at this position, and the collision force can be diffused to the bottom plate 310 frame of the battery frame 300 to disperse the collision force.

[0049] Referring to Figure 1 and Figure 3 Further, in order to solve the problem of increasing the capacity of the power battery 200 while ensuring safety in side collision, the power battery 200 further comprises a buffer material. A protective layer 500 formed of the buffer material is arranged between the battery frame 300 and the battery cell. Specifically, in this embodiment, the protective layer 500 is configured as a polyurethane filling layer. The battery frame 300 and the battery cell group 410 are arranged with a liquid cooling plate 421 and a water pipe 422 for cooling. The polyurethane filling layer wraps the liquid cooling plate 421 and the water pipe 422. In order to improve the cooling efficiency, the liquid cooling plate 421 is arranged between the rows of battery cells to increase the cooling area of the battery cells. In order to increase the utilization rate of the internal space of the battery, the interface of the liquid cooling plate 421 and the water pipe 422 is arranged between the side beam 320 and the battery cell. In order to protect the liquid cooling plate 421, polyurethane material is added. The polyurethane material is attached to the battery cell and the side beam. The middle is hollow to avoid the liquid cooling plate 421. In the collision, the side beam 320 deforms at the thinned part of the first cavity 351 of the side beam lower part 350, so that the stress area of the polyurethane material is also increased, thereby minimizing the impact on the battery cell. The polyurethane material protects the liquid cooling plate 421. The polyurethane material can withstand an impact of more than 80Mpa, and can avoid the cooling liquid of the liquid cooling plate 421 from flowing out when the power battery 200 is subjected to side collision.

[0050] Referring to Figure 1 and Figure 3Further, in order to protect the power battery 200, the battery frame 300 further comprises a scratch guard 600, and the lower part 350 of the side beam is provided with a mounting position 352, and the scratch guard 600 is detachably fixed to the mounting position 352. In order to facilitate replacement, in the embodiment, the scratch guard 600 is fixed to the mounting position 352 by bolts, and after the battery is scratched, the scratch guard 600 can be directly replaced. In other embodiments, other detachable connection modes such as projection nut, clamping and the like can also be used. Specifically, the scratch guard 600 is fixed to the mounting position 352 by a fastener 800, and the mounting position 352 is formed with a groove along the penetrating direction of the fastener, and the head of the fastener 800 is arranged in the groove.

[0051] In an embodiment, the bottom wall 353 of the first cavity 351 is provided with a mounting position 352, and the groove at the mounting position 352 is recessed in the penetrating direction of the fastener 800. The fastener 800 penetrates the bottom wall 353 and is arranged in the first cavity 351, and the head of the fastener 800 is hidden in the groove. In this way, the bottom wall 353 is thinned, and the fastener 800 for fixing the scratch guard 600 is prevented from being exposed, so that the appearance and high-grade feeling are ensured.

[0052] In another embodiment, as shown in Figure 1 and 3 , the bottom wall 353 of the first cavity 351 is provided with a mounting position 352, and the groove at the mounting position 352 is formed by the right side wall of the fixed part 370, the bottom wall 353 and the left side wall of the connecting part 360. The design of the groove can prevent the head of the fastener 800 of the scratch guard 600 from being exposed, so that the appearance and high-grade feeling are ensured. Further, the groove can also induce the side beam to deform at this position when a collision occurs, and in order to deform more easily, the thickness of the bottom wall 353 at this position is also thinned compared with the peripheral side wall. The structure of the side beam 320 is prevented from directly extruding to the direction of the battery cell when a collision occurs. In the actual analysis process, the side beam 320 will be extruded and deformed obliquely upward after deformation, which increases the stress area of the polyurethane material and reduces the impact on the cooling module and the battery cell.

[0053] Referring to Figure 1 and Figure 3 , further, in order to reduce the mass of the battery frame 300 and facilitate light weight, the upper part 340 of the side beam is provided with a third cavity 341, and further, a reinforcing structure is arranged in the third cavity 341 to divide the third cavity 341 into a plurality of sub-cavities. Specifically, the reinforcing structure comprises a plurality of reinforcing ribs 342 distributed in the third cavity 341, and the plurality of reinforcing ribs 342 are arranged obliquely between the two side walls of the third cavity 341. While increasing the structural strength, the plurality of oblique reinforcing ribs 342 also facilitate the collision collapse of the plurality of sub-cavities formed by the plurality of oblique reinforcing ribs 342, and have a certain effect on buffering and energy absorption.

[0054] With reference to Figure 1 and Figure 3 In order to further reduce the weight of the battery frame 300, the upper side beam portion 340 bears less force in a collision than the lower side beam portion 350, and thus the third cavity 341 of the upper side beam portion 340 has a smaller wall thickness than the side wall thickness of the first cavity 351 of the lower side beam portion 350. In order to facilitate cushioning deformation, the reinforcing ribs 342 of the third cavity 341 of the upper side beam portion 340 are also designed to be inclined. In this embodiment, two reinforcing ribs 342 are arranged in the third cavity 341 and are inclined. The reinforcing ribs 342 have a trapezoidal structure in cross section with the side wall of the third cavity 341. In this way, the thickness of the side beam 320 is minimized while ensuring the collision effect, thereby achieving the lightweight design requirement.

[0055] Further, in order to ensure stable fixing with the rocker beam 100 and to ensure transmission of the collision force during a collision, the connection between the fixing portion 370 and the lower side beam portion 350 is inclined, which facilitates connection with the rocker beam 100. In addition, the wall thickness of the connection between the fixing portion 370 and the lower side beam portion 350 is greater than that of other positions, thereby enhancing the connection strength between the fixing portion 370 and the lower side beam portion 350.

[0056] With reference to Figure 1 and Figure 3 Specifically, the rocker beam 100 and the fixing portion 370 are connected by fasteners 800. In this embodiment, the fasteners 800 are bolts. In order to avoid protruding of the bolts from the fixing portion 370, the fixing portion 370 is recessed in the Z direction to form a sink 371. The Z direction is the vertical direction of the bottom plate 310, i.e., the Z direction of the vehicle. The bolts pass through the fixing portion 370 from bottom to top to connect the fixing portion 370 and the rocker beam 100. After fixing, the heads of the bolts are located in the sink 371, avoiding protruding from the bottom surface of the fixing portion 370.

[0057] Specifically, in order to ensure stability of the structure, the side beam 320 is integrally extruded. That is, the side beam portion 330, the fixing portion 370, and the connecting portion 360 are integrally arranged. In order to reduce the weight and ensure lightweight, the side beam 320 can be integrally extruded from an aluminum alloy.

[0058] In use, the battery cell module 400 is placed into the battery frame 300 from the opening of the battery frame 300 and is fixed, the polyurethane is arranged between the battery cell module 400 and the side beam of the battery frame 300, the battery upper cover 700 is covered on the opening of the battery frame 300 and is fixed, the assembled power battery 200 is installed to the bottom plate of the vehicle, is connected and fixed with the rocker beam 100 through the fixed part 370 of the side beam 320 of the battery frame 300, is locked by screwing, the anti-scratching guard plate 600 is fixed on the installation position 352 of the lower part 350 of the side beam, is locked by screwing, and the anti-scratching guard plate 600 can be first installed on the battery frame 300. The bolts of the rocker beam 100 and the bolts of the anti-scratching guard plate 600 are not convex outward, so that the appearance is ensured.

[0059] Referring to Figure 4 and Figure 5 When the vehicle is subjected to side collision, the collision force first collides with the rocker beam 100, and the plurality of cavities of the rocker beam 100 will be collapsed and deformed in the collision process, and a part of the energy is absorbed. The remaining energy is partly transmitted to other areas of the vehicle body through the seat cross beam in the transverse direction of the vehicle body floor. Another part of the remaining energy is transmitted to the side beam part 330 through the fixed part 370, the side beam part 330 is induced to bend at the installation position 352 of the anti-scratching guard plate 600, and after deformation, the side beam part 330 is obliquely extruded and deformed upwards, the stress area of the side beam part 330 and the polyurethane material is increased, the impact on the cooling assembly 420 and the battery cell group 410 is reduced, and at the same time, the excess energy is transmitted to the bottom plate 310 of the battery frame 300 through the connecting part 360 of the battery frame 300, and then is transmitted to the side beam 320 on the other side of the battery frame 300 through the bottom plate 310, and then is transmitted to the vehicle body structure.

[0060] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A battery frame, characterized in that, include: Base plate; and Side beams are located on opposite sides of the base plate. Each side beam includes a side beam portion extending along the height direction of the base plate, a connecting portion located inside the side beam portion and connected to the base plate, and a fixing portion located outside the side beam portion and used to connect to the vehicle sill beam. The side beam includes an upper side beam and a lower side beam. The upper side beam is located above the lower side beam. The outer side of the lower side beam is connected to the fixing part, and the inner side is connected to the connecting part. The lower side beam is provided with a first cavity. The thickness of the bottom wall of the first cavity is less than the thickness of the side wall of the first cavity. The connecting portion extends away from the base plate from the part connected to the base plate and slopes upward toward the bottom wall of the first cavity, so that the connecting portion and the bottom wall of the first cavity form a continuous inclined transition surface. The bottom wall of the first cavity is provided with a mounting position, and the mounting position forms a groove along the insertion direction of the fastener.

2. The battery frame as described in claim 1, characterized in that, The battery frame also includes a scratch-resistant plate, which is detachably fixed to the mounting position.

3. The battery frame as described in claim 2, characterized in that, The anti-scratch guard plate is fixed to the mounting position by fasteners, with the head of the fastener placed in the groove.

4. The battery frame as described in claim 1, characterized in that, The connecting part is provided with a second cavity.

5. The battery frame as described in claim 4, characterized in that, The wall thickness of the second cavity is greater than or equal to the sidewall thickness of the first cavity.

6. The battery frame as described in any one of claims 1 to 5, characterized in that, A third cavity is provided on the upper part of the side beam, and a reinforcing structure is provided inside the third cavity.

7. The battery frame as described in claim 6, characterized in that, The reinforcing structure includes multiple reinforcing ribs distributed inside the third cavity. The multiple reinforcing ribs are inclinedly arranged between the two side walls of the third cavity and separate the third cavity to form multiple sub-cavities.

8. The battery frame as described in claim 7, characterized in that, The sidewall thickness of the third cavity is less than that of the sidewall thickness of the first cavity.

9. The battery frame as described in claim 1, characterized in that, The connection between the fixing part and the lower part of the side beam is inclined.

10. The battery frame as described in claim 9, characterized in that, The fixing part includes a recessed groove formed at the bottom, and a fastener passes through the fixing part and is fixed to the vehicle sill beam, with the head of the fastener located in the recessed groove.

11. The battery frame as claimed in claim 1, characterized in that, The side beam is integrally extruded.

12. A power battery, characterized in that, It includes a cell module and a battery frame for mounting the cell module, wherein the battery frame is the battery frame as described in any one of claims 1 to 11.

13. The power battery as described in claim 12, characterized in that, The power battery also includes a protective layer, which is disposed between the cell module and the battery frame.

14. A vehicle, characterized in that, The device includes a vehicle body and a power battery as described in claim 12 or 13, wherein the two fixed parts are respectively connected to a door sill beam of the vehicle body, and the door sill beam has a cavity structure.

15. The vehicle as claimed in claim 14, characterized in that, The threshold beam is integrally extruded.

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