Battery pack box body and battery pack

Abstract

The utility model discloses a battery pack box body and a battery pack. The battery pack box comprises a box body, a reinforcing frame is arranged outside the box body, and the reinforcing frame comprises a bottom transverse force transmission beam, a bottom longitudinal force transmission beam and two side mounting frame beams, the bottom transverse force transmission beam and the bottom longitudinal force transmission beam are arranged below a bottom plate of the box body, and the two side mounting frame beams are arranged on the outer sides of two side plates of the box body. The bottom transverse force transmission beam and the bottom longitudinal force transmission beam are connected in a perpendicular and crossed mode. The two side mounting frame beams are connected with the two ends of the bottom transverse force transfer beam; and at least two stress dispersion frames are arranged in the inner side groove-shaped space of each side mounting frame beam. On the premise that the cost of the box body is reduced and the weight of the box body is slightly increased, the overall strength of the box body is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, in particular to a battery pack box body and a battery pack. Background Art

[0002] As a key component of electric vehicles, the reliability of batteries is directly related to the safety of the whole vehicle. For existing battery boxes, due to the limitations of low one-time investment and low unit cost, using sheet metal bending for the box body is currently the best solution. The advantages of this solution are low one-time investment and no need to develop new molds, which is the best alternative before it is confirmed whether the product can be mass-produced. The disadvantage is that the structure is simple and complex structures cannot be made to meet higher-strength vibration tests.

[0003] As found in the vibration test of the above battery pack, after the battery pack is installed on the bench fixture, when performing a 1.5-fold GB38031 battery pack-level vibration test on the bench fixture, the welding joints at the four corners of the battery box body are prone to looseness, resulting in cracks at the four corners of the box body in the later stage of the test, and unable to meet the requirements of IP68 at the battery pack level.

[0004] With the increasingly stringent requirements for vibration standards, the battery pack box body urgently needs to be strengthened synchronously. However, the overall strengthening scheme directly affects the energy density of the battery pack. Therefore, it is necessary to design a battery pack box body that can strengthen the box body strength with a slight increase in weight to meet more stringent vibration requirements. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies and defects of the prior art, and provide a battery pack box body with low cost and high strength. This battery pack box body enhances the mechanical strength of the box body while meeting the low-cost requirements of the box body, and improves the reliability of the battery pack.

[0006] In the first aspect of the utility model, a battery pack box body is provided, which includes a box body main body, and a strengthening frame is arranged outside the box body main body. The strengthening frame includes a bottom transverse force transmission beam, a bottom longitudinal force transmission beam arranged under the bottom plate of the box body main body, and two side installation frame beams arranged outside the two side plates of the box body main body. The bottom transverse force transmission beam is vertically and cross-connected with the bottom longitudinal force transmission beam; the two side installation frame beams are connected to both ends of the bottom transverse force transmission beam; at least two stress dispersion frames are arranged in the inner groove-shaped space of each side installation frame beam.

[0007] Among them, the two stress dispersion frames are relatively arranged at the inner sides of both ends of the side installation frame beam; the stress dispersion frame includes a frame strengthening cross beam and at least one frame strengthening longitudinal beam vertically connected to the frame strengthening cross beam.

[0008] Among them, at least one T-shaped structure is formed after the frame reinforcing longitudinal beam is connected to the frame reinforcing cross beam.

[0009] Among them, both ends of the frame reinforcing longitudinal beam are connected to the top plate and the bottom plate of the inner trough-shaped space of the side-mounted frame beam. One end of the frame reinforcing cross beam is connected to the side surface of one of the frame reinforcing longitudinal beams, and the other end is connected to the end plate of the inner trough-shaped space of the side-mounted frame beam.

[0010] Among them, the bottom end of the frame reinforcing longitudinal beam corresponds to the connection surface of the bottom transverse force transmission beam for connecting the side-mounted frame beam.

[0011] Among them, in the up-and-down direction of the frame reinforcing longitudinal beam, frame mounting points are arranged on the side-mounted frame beam.

[0012] Among them, the bottom transverse force transmission beam, the bottom longitudinal force transmission beam and the side-mounted frame beam are welded together; the side-mounted frame beam is welded to the box body, and the stress dispersion frame is welded to the side-mounted frame beam.

[0013] Among them, the bottom transverse force transmission beam, the bottom longitudinal force transmission beam and the side-mounted frame beam are all made by bending steel plates.

[0014] Among them, a module mounting beam is arranged on the inner bottom surface of the box body, including a module front mounting beam and a module rear mounting beam which are arranged relatively separated; the module mounting beam is welded to the box body.

[0015] In the second aspect of the present utility model, a battery pack is provided, including the battery pack box body.

[0016] For the battery pack box body of the present utility model, the force transmission path is optimized by arranging a reinforcing frame outside the box body, and the stress at the bottom and side of the box body is effectively connected through the frame beam and the box body side hanging point; the force transmission beam structure in the bottom area of the box body is optimized, so that the force transmission beam is structurally connected to the side-mounted frame beam to form a closed-loop force transmission path, so that the concentrated stress received by the box body is evenly dispersed, the force on the mounting point of the battery pack is reduced, the modal frequency of the battery pack in the Z-direction and Y-direction is increased, and the anti-vibration and anti-impact performance of the battery pack is improved. On the premise of reducing the cost of the box body and increasing the weight less, the overall strength of the box body is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an exploded schematic diagram of the battery pack box body and the battery module of the embodiment of the present utility model.

[0018] Figure 2 is an overall structural schematic diagram of the battery pack box body of the embodiment of the present utility model.

[0019] Figure 3 It is a schematic diagram of the back structure of the battery pack box body according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the strengthening frame beam of the battery pack box body according to an embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of a stress dispersion frame of a side-mounted vehicle frame beam of the battery pack box body according to an embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of another stress dispersion frame of the side-mounted vehicle frame beam of the battery pack according to an embodiment of the present invention. Specific embodiments

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] Please refer to Figures 1 to 6 As shown, in the battery pack box body of the present invention, it includes a box body main body 110, and a strengthening frame is arranged outside the box body main body. The strengthening frame includes a bottom transverse force transmission beam, a bottom longitudinal force transmission beam, and a side-mounted vehicle frame beam 192 arranged below the outer surface of the bottom plate of the box body main body. The bottom transverse force transmission beam and the bottom longitudinal force transmission beam are vertically and cross-connected; the two side-mounted vehicle frame beams 190 are arranged relatively spaced apart on the outer sides of the two side plates of the box body main body and are connected to both ends of the bottom transverse force transmission beam; at least two stress dispersion frames are arranged in the inner groove-shaped space of each side-mounted vehicle frame beam. Through the stress dispersion frames, the stress at the bottom of the box body can be effectively evenly distributed on each installation point connected to the vehicle body through the stress dispersion support brackets, reducing the maximum concentrated stress at the installation points, thereby increasing the upper limit of the overall Y-direction force of the box body.

[0025] In one embodiment, there are three of the bottom transverse force transmission beams. As shown in the figure, they include a first bottom transverse force transmission beam 140, a second bottom transverse force transmission beam 150, and a third bottom transverse force transmission beam 160. They are arranged parallel to each other and have the same structure. There are three of the bottom longitudinal force transmission beams, including two first bottom longitudinal force transmission beams 170 and one second bottom longitudinal force transmission beam 180. The two first bottom longitudinal force transmission beams 170 are arranged on both sides of the second bottom longitudinal force transmission beam 180.

[0026] In one embodiment, the two stress dispersion frames are arranged relatively at the inner ends of the side-mounted vehicle frame beam 190; the stress dispersion frame includes a vehicle frame strengthening cross beam 194 and at least one vehicle frame strengthening longitudinal beam 193 perpendicular to the vehicle frame strengthening cross beam.

[0027] In a preferred embodiment, after the frame reinforcing longitudinal beam is connected to the frame reinforcing cross beam, at least one T-shaped structure is formed, and it can also be two T-shaped structures or three T-shaped structures. For example, Figure 6 An embodiment showing two T-shaped structures is as follows. Figure 6 As shown, on the basis of the frame reinforcing longitudinal beam 193, another frame reinforcing longitudinal beam 197 is added to form a double-T force transmission structure with the frame reinforcing cross beam 194. Similarly, a third frame reinforcing longitudinal beam can form a triple-T force transmission structure. By adding a stress dispersion frame composed of the box frame reinforcing longitudinal beam 193 and the frame reinforcing cross beam 194 inside the side-mounted frame beam 190, the stress at the bottom is effectively evenly distributed on each mounting point connected to the vehicle body through the stress dispersion frame, and the maximum concentrated stress at the mounting point is reduced, thereby increasing the upper limit of the force in the Y direction of the overall box body.

[0028] In one embodiment, both ends of the frame reinforcing longitudinal beam are connected to the top plate and the bottom plate of the inner trough-shaped space of the side-mounted frame beam. One end of the frame reinforcing cross beam is connected to the side surface of one of the frame reinforcing longitudinal beams, and the other end is connected to the end plate 196 of the inner trough-shaped space of the side-mounted frame beam. The frame reinforcing longitudinal beam 193 abuts against the upper and lower inner surfaces of the inner wall of the side-mounted frame beam 190, and the frame reinforcing cross beam 194 connects the frame reinforcing longitudinal beam 193 and the end plate 196 of the side-mounted frame beam 190, so that the stress dispersion frame and the side-mounted frame beam 190 form a closed mechanical transmission path.

[0029] In one embodiment, the bottom end of the frame reinforcing longitudinal beam corresponds to the connection surface of the bottom transverse force transmission beam for connecting the side-mounted frame beam. Taking the first bottom transverse force transmission beam as an example, it has a connection surface 141 for connecting to the side-mounted frame beam 190, and is used to weld the side-mounted frame beam and the first bottom transverse force transmission beam together.

[0030] In one embodiment, in the up and down direction of the frame reinforcing longitudinal beam, frame mounting points 195 are arranged on the side-mounted frame beam.

[0031] In one embodiment, the bottom transverse force transmission beam, the bottom longitudinal force transmission beam and the side-mounted frame beam are welded together; the side-mounted frame beam is welded to the box body main body, and the stress dispersion frame is welded to the side-mounted frame beam. Specifically, the frame reinforcing longitudinal beam 193 and the frame reinforcing cross beam 194 can be welded to the side-mounted frame beam 190 by CO2 shielded arc welding to form a stress dispersion frame, and the stress dispersion frame can effectively evenly disperse the force transmitted by the bottom cross beam to each mounting point of the side-mounted frame beam 190, solving the problem that the mounting points at the four corners of the box body are prone to concentrated stress caused by Y-direction vibration and resulting in cracking of the box body in the later stage of vibration.

[0032] Specifically, the bottom transverse force transmission beam and the first bottom longitudinal force transmission beam 170 can be first welded into a small assembly by resistance welding, and then welded to the side mounting frame beam 190 through resistance welding and CO2 shielded arc welding processes. The second bottom longitudinal force transmission beam 180 is fixed at the corresponding position of the bottom transverse force transmission beam through CO2 shielded arc welding. Finally, the formed strengthening frame and the box body 110 are welded by resistance welding.

[0033] In one embodiment, the bottom transverse force transmission beam, the bottom longitudinal force transmission beam, and the side mounting frame beam are all made by bending steel plates. Specifically, when manufacturing the battery pack box body of the present application, the box body 110, the front module mounting beam 120, the rear module mounting beam 130, the bottom transverse force transmission beam, the bottom longitudinal force transmission beam, the side mounting frame beam 190, the frame strengthening longitudinal beam 193, and the frame strengthening cross beam 194 can be respectively cut into the required unfolded material state through the laser cutting process according to the design scheme of the drawing, and then processed and prepared by a bending machine according to the specified bending path. In the embodiment of the present application, the main structures of the strengthening frame all use bent steel plates, which have the advantages of low cost and no need for mold opening.

[0034] In one embodiment, module mounting beams are arranged on the inner bottom surface of the box body, including a front module mounting beam 120 and a rear module mounting beam 130 that are relatively spaced apart; the module mounting beams are welded and connected to the box body. Specifically, the front module mounting beam 120 and the rear module mounting beam 130 can be installed on the box body 110 through resistance welding. Among them, the module assembly 200 is fixed on the front module mounting beam 120 and the rear module mounting beam 130 of the box body through module mounting bolts 300.

[0035] In the embodiment of the present application, the front module mounting beam 120 and the rear module mounting beam 130 can transfer the stress they receive to the bottom transverse force transmission beam through the box body 110. The bottom longitudinal force transmission beams 170 and 180 of the box body are directly below the module assembly. The inertial force received by the module assembly 200 can be transferred to the bottom longitudinal force transmission beams of the box body through the box body 110, and then transferred to the lower bottom surface 191 of the side mounting frame beam 190 through the bottom transverse force transmission beam. The lower bottom surface 191 is transferred to the frame strengthening longitudinal beam 193 through the side surface 192 of the side mounting frame beam assembly. The frame strengthening longitudinal beam 193 disperses the concentrated stress received by the entire box body to the frame mounting points 195 around the stress dispersion frame through the frame strengthening cross beam 194, solving the problem that the mounting points at the four corners of the box body are prone to concentrated stress generated by Y-direction vibration, resulting in cracking of the box body in the later stage of vibration.

[0036] Taking the first bottom transverse force transfer beam 140 as an example, after the first bottom longitudinal force transfer beam 170 transfers the inertial force of the module assembly to the first bottom transverse force transfer beam 140 of the box body, the concentrated stress of the first bottom transverse force transfer beam 140 will be directly transferred to the lower bottom surface 191 of the side mounting frame beam 190 welded thereto. The lower bottom surface 191 is transferred to the frame reinforcing longitudinal beam 193 through the side surface 192 of the side mounting frame beam 190. The frame reinforcing longitudinal beam 193 corresponds to the connection surface 141 for welding of the first bottom transverse force transfer beam 140. The frame reinforcing longitudinal beam 193 disperses the concentrated stress received by the entire box body to the frame mounting points 195 around the stress dispersion bracket through the frame reinforcing cross beam 194.

[0037] In a second aspect of the present invention, a battery pack is provided, including the battery pack box body.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0039] Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0040] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. Battery pack housing, characterized in that, It includes a box body. An enhanced frame is arranged outside the box body. The enhanced frame includes a bottom transverse force transmission beam, a bottom longitudinal force transmission beam arranged under the bottom plate of the box body, and two side mounting frame beams arranged outside the two side plates of the box body. The bottom transverse force transmission beam is perpendicularly and cross - connected with the bottom longitudinal force transmission beam. The two side mounting frame beams are connected to both ends of the bottom transverse force transmission beam. At least two stress dispersion frames are arranged in the inner trough - shaped space of each side mounting frame beam.

2. The battery pack housing according to claim 1, characterized in that, The two stress dispersion frames are relatively arranged at the inner sides of both ends of the side mounting frame beam. The stress dispersion frame includes a frame strengthening cross beam and at least one frame strengthening longitudinal beam perpendicularly connected to the frame strengthening cross beam.

3. The battery pack housing according to claim 2, characterized in that, At least one T - shaped structure is formed after the frame strengthening longitudinal beam is connected with the frame strengthening cross beam.

4. The battery pack housing according to claim 2, wherein Both ends of the frame strengthening longitudinal beam are connected to the top plate and the bottom plate of the inner trough - shaped space of the side mounting frame beam. One end of the frame strengthening cross beam is connected to the side surface of one frame strengthening longitudinal beam, and the other end is connected to the end plate of the inner trough - shaped space of the side mounting frame beam.

5. The battery pack housing according to claim 2, wherein The bottom end of the frame strengthening longitudinal beam corresponds to the connection surface of the bottom transverse force transmission beam for connecting the side mounting frame beam.

6. The battery pack housing according to claim 2, wherein In the up - and - down direction of the frame strengthening longitudinal beam, frame mounting points are arranged on the side mounting frame beam.

7. The battery pack housing according to claim 2, wherein, The bottom transverse force transmission beam, the bottom longitudinal force transmission beam and the side mounting frame beam are welded together. The side mounting frame beam is welded to the box body, and the stress dispersion frame is welded to the side mounting frame beam.

8. The battery pack housing according to claim 1, wherein, The bottom transverse force transmission beam, the bottom longitudinal force transmission beam and the side mounting frame beam are all made by bending steel plates.

9. The battery pack housing according to claim 1, characterized in that, The inner bottom surface of the box body is provided with module mounting beams, including a module front mounting beam and a module rear mounting beam arranged relatively and spaced apart. The module mounting beam is welded and connected to the box body.

10. Battery pack, characterized in that, It includes the battery pack box body according to any one of claims 1 - 9.

Images