A high-voltage electrical safety protection structure for a battery pack, a battery pack, and a vehicle.

Abstract

This invention discloses a high-voltage electric safety protection structure for a battery pack, a battery pack, and a vehicle, belonging to the field of new energy vehicle technology. It includes a battery pack housing for supporting the battery cells; the battery pack housing has opposing support members inside, with mounting space for electrical components between the support members and mounting space for the battery cells between the battery pack housing and the support members; the height of the support members is higher than the upper surface of the battery cells, and the support members are located directly below the overlap between the central channel and the rear crossbeam of the seat, to withstand the downward compressive force generated at the overlap under side pole impact conditions. This invention increases the self-protection of the battery pack in side pole impact conditions without modifying the vehicle body, reduces the contact between the upper surface of the battery pack module or core and surrounding components, and ensures the high-voltage electric safety of the battery pack; it also solves the problems of high cost and difficulty in modifying existing protection methods.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a high-voltage electric safety protection structure for a battery pack, a battery pack, and a vehicle. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] On urban roads, national highways, and expressways, road traffic conditions are complex, and various accidents occur frequently. When a vehicle experiences uncontrollable rotation while in motion, its side may collide with pillar-like objects such as trees or utility poles. Compared to other types of collisions, side-pole collisions have a smaller contact area and a larger impact load per unit area, causing significant intrusion into the door sill beam. For electric vehicles, excessive lateral intrusion into the lower body can cause the battery pack's internal modules to be compressed by surrounding components in different directions, posing a risk of short circuits or even fire and explosion.

[0004] Therefore, a 32 km side pole impact requirement has been put forward for new energy vehicles. From the perspective of overall vehicle structural protection, for models that retain the underfloor longitudinal beam (the battery pack mounting point needs to be arranged on the underfloor longitudinal beam), the main force transmission channels of the lower body (sill-front seat crossbeam-middle channel) are required to have sufficient strength and buffer space (the distance between the inside of the sill and the outside of the underfloor longitudinal beam) to resist side intrusion.

[0005] Currently, improvements to the vehicle body are mainly made by strengthening the materials, thickness, and cross-section of components in the main force transmission channels and increasing buffer space. On the one hand, this leads to a reduction in the overall weight of the vehicle body and the energy density of the battery pack. On the other hand, modifying the main force transmission channels of the vehicle body not only involves improvements to the structure and size of components, but also requires a rearrangement of the battery pack installation distribution based on the improved force transmission channels. The modification is difficult and costly. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-voltage electric safety protection structure for a battery pack, a battery pack, and a vehicle. From the perspective of battery pack self-protection, the high-voltage electric safety protection structure reduces the contact between the upper surface of the battery pack module or core and surrounding components under side pole impact conditions, thereby preventing the battery pack cells from being squeezed.

[0007] In a first aspect, the present invention provides a high-voltage electrical safety protection structure for a battery pack;

[0008] A high-voltage electric safety protection structure for a battery pack is applicable to a vehicle body bracket, the vehicle body bracket including an overlapping rear crossbeam of the seat and a central channel, and a battery pack housing for carrying battery cells;

[0009] The battery pack housing has opposing support members inside, and there is a space for installing electrical components between the support members. There is also a space for installing battery cells between the battery pack housing and the support members.

[0010] The height of the support member is higher than the upper surface of the battery cell, and the support member is located directly below the joint between the central channel and the rear crossbeam of the seat, so as to bear the downward extrusion force generated at the joint under the condition of side column collision.

[0011] By adopting the above technical solution, there is no need to modify the vehicle body. In the case of a pole collision, the support component can support the downwardly pressing joint, preventing the upper surface of the battery cell from being squeezed and ensuring the safety of the high-voltage electricity of the battery cell.

[0012] In some embodiments, the support member includes a plate body, and a plurality of side plates are provided on one side of the plate body, the plurality of side plates being evenly distributed along the length direction of the plate body.

[0013] By adopting the above technical solution, the plate and side plates form a stable support structure with a triangular-like structure, ensuring the stability of the support component itself during installation.

[0014] In some embodiments, mounting through holes are provided at the top of the plate and the bottom of the side plate, and a reinforcing member is provided inside the battery pack housing, the reinforcing member being located at the bottom of the battery pack housing;

[0015] The plate and the side plate are connected to the reinforcing member by bolts and through the mounting holes.

[0016] By adopting the above technical solution, a stable connection between the support and the battery pack can be achieved, avoiding problems such as the support tipping over or the connection failing during a collision.

[0017] In some embodiments, the plate has multiple longitudinal channels that are evenly distributed along the length of the plate and penetrate the plate along its height.

[0018] By adopting the above technical solution, the longitudinal channel is hollow, which can reduce the weight of the support components; at the same time, it can also ensure ventilation and heat dissipation inside the battery pack.

[0019] In some embodiments, the longitudinal section of the side plate is trapezoidal.

[0020] By adopting the above technical solutions, the overall stability of the support structure is improved.

[0021] In some embodiments, a groove is provided on one side of the side plate.

[0022] By adopting the above technical solution, the weight of the support component can be reduced.

[0023] In some embodiments, a battery pack mounting frame is provided at the bottom of the battery pack housing, and the battery pack mounting frame surrounds the battery pack housing.

[0024] By adopting the above technical solutions, support is provided for the battery pack casing, thereby improving its structural stability and integrity.

[0025] In some embodiments, the support member is a cast aluminum part.

[0026] By adopting the above technical solution, the strength of the support component is guaranteed, while ensuring that it does not deform in the Z-direction or the Z-direction deformation is very small under the condition of side column collision.

[0027] Secondly, the present invention provides a battery pack;

[0028] A battery pack, including the aforementioned high-voltage electrical safety protection structure for the battery pack.

[0029] Thirdly, the present invention provides a vehicle;

[0030] A vehicle including the aforementioned high-voltage electrical safety protection structure for a battery pack.

[0031] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0032] 1. The technical solution provided by this invention does not require modification of the vehicle body. Starting from the self-protection of the battery pack, it designs a structure that is beneficial to the high-voltage electric safety of PHEV models under the side pole impact condition. While taking into account cost, weight and battery pack capacity, it reduces the contact between the upper surface of the battery pack module or core and the surrounding components, thus solving some of the high-voltage electric safety problems of the battery pack in the pole impact.

[0033] 2. The technical solution provided by this invention provides Z-axis support to the components pressed down on the vehicle body during a collision, so that the upper surface of the battery cell is not squeezed and deformed, thereby increasing the self-protection of the battery pack. This achieves the purpose of preventing the upper surface of the battery cell (especially the square-shell battery cell with the positive and negative terminals facing upwards) from contacting the surrounding components. The modification is simple and cost-effective. At the same time, the support directly supports the central tunnel of the car, preventing it from twisting and deforming.

[0034] 3. The technical solution provided by this invention can achieve the same battery protection function as existing designs such as adding crossbeams to the vehicle body, adding crossbeams inside the battery pack, and reducing the size of the battery pack to increase the space for pole collisions. However, it has advantages in terms of cost, weight, and battery pack capacity. Moreover, compared with traditional thickening solutions, the deformation of the main force transmission channels in this patent is more stable, and the reproducibility in simulation and experiment is stronger, which is conducive to optimization. Attached Figure Description

[0035] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0036] Figure 1 This is a schematic diagram of the main force transmission channels of the vehicle body under conventional side pole collision conditions provided in an embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the installation of the high-voltage electrical safety protection structure for the battery pack provided in an embodiment of the present invention;

[0038] Figure 3 This is a structural schematic diagram of the support member provided in an embodiment of the present invention;

[0039] In the diagram: 1. Inner door sill panel; 2. Front crossbeam of the seat; 3. Rear crossbeam of the seat; 4. Seat mounting bracket; 5. Center channel; 6. Battery pack mounting crossbeam; 7. Battery pack mounting frame; 8. Battery cell; 9. Electrical components; 10. Battery pack housing; 11. Support component; 12. Mounting through hole; 13. Reinforcing component.

[0040] The distances or dimensions between parts have been exaggerated to show their positions; the diagram is for illustrative purposes only. Detailed Implementation

[0041] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] Example 1

[0043] Some existing new energy vehicles have battery pack mounting points on the longitudinal beams under the floor. In a side pole collision at 32 km / h, the vehicle body will compress the battery pack. However, existing protection measures mostly involve modifying the vehicle body, which is costly and difficult, leading to an increase in the overall weight of the vehicle body and a decrease in the energy density of the battery pack. In order to solve the above technical problems, this invention proposes a high-voltage electric safety protection structure for the battery pack.

[0044] Under normal side pole collision conditions, the force transmission channel structure of the vehicle body is as follows Figure 1 shown, including the inner sill panel 1, the front seat crossbeam 2, the middle channel 5, the rear seat crossbeam 3 and the seat mounting bracket 4. Four seat mounting brackets 4 are respectively installed on both sides of the middle channel 5. The front seat crossbeam 2 is respectively fixed to the two front seat mounting brackets 4 located in the front. The rear seat crossbeam 3 is respectively fixed to the two rear seat mounting brackets 4 located in the rear. There is an installation space for the battery pack below the middle channel 5. Under normal side pole collision conditions, the force transmission channel path is the inner sill panel 1, the front seat crossbeam, the middle channel 5, and the front seat crossbeam on the opposite side.

[0045] Combined with Figures 1-3 , the high-voltage electricity safety protection structure of the battery pack includes a battery pack housing 10 for carrying the battery cells 8. Two relatively arranged support members 11 are installed inside the battery pack housing 10. There is an installation space for the electrical components 9 between the support members 11. There is an installation space for the battery cells 8 between the battery pack housing 10 and the support members 11. In order to prevent the battery cells 8 from being squeezed, the height of the support members 11 is higher than the upper surface of the battery cells 8. At the same time, when the battery pack is installed below the middle channel 5, the support members 11 are located directly below the overlapping part of the middle channel 5 and the rear seat crossbeam 3 to bear the squeezing force generated downward at the overlapping part under the side pole collision condition.

[0046] The middle channel 5 is generally in a "U" shape. Its overlap with the rear seat crossbeam 3 is a natural bending point under the pole collision condition, that is, this overlapping part is prone to bend downward towards the vehicle body, squeezing the upper surface of the battery pack battery cells 8, which is extremely likely to cause high-voltage electricity safety hazard phenomena such as leakage, short circuit, and fire.

[0047] In this embodiment, in order to ensure that the support members 11 have sufficient strength and do not deform in the Z direction or have very little Z-direction deformation during the collision, considering the strength, energy density and weight of the support members 11 comprehensively, cast aluminum parts are used as the support members 11. <00,00105>As an implementation method, as Figure 3 shown, the support member 11 includes a plate body. Three side plates are installed on one side of the plate body. The three side plates are evenly distributed along the length direction of the plate body. The longitudinal section of the side plate is trapezoidal, so that the side plate and the plate body form a stable structure similar to a triangular structure, ensuring the stability of the support member 11.

[0049] The plate body is provided with a plurality of longitudinal channels. The longitudinal channels are evenly distributed along the length direction of the plate body, and the longitudinal channels penetrate the plate body along the height direction of the plate body to reduce its mass while ensuring the strength of the support member 11, and at the same time achieve the effect of ventilation and heat dissipation.

[0050] Furthermore, in order to achieve a stable connection between the support member 11 and the battery pack housing 10 and to prevent it from tipping over or failing at the connection point during a collision, there are two through holes 12 penetrating the plate at the top of the plate, and a connector with through holes 12 is connected to the bottom of the side plate; a reinforcing member 13 is installed on the bottom plate of the battery pack housing 10, and the support member 11 and the plate are fixed to the reinforcing member 13 by bolts passing through the through holes 12.

[0051] Two longitudinally arranged battery pack mounting beams 6 are symmetrically installed at the bottom of the front crossbeam 2 and the rear crossbeam 3 of the seat. The battery pack housing 10 is located between the two battery pack mounting beams 6. A battery pack mounting frame 7 is installed at the bottom of the battery pack housing 10, which surrounds the battery pack housing 10. When in use, the battery pack is placed under the central channel 5, and the battery pack mounting frame 7 is connected to the battery pack mounting beams 6.

[0052] During the collision, the joint bends downwards, and the support 11 provides Z-axis support to the components that are pressed down by the vehicle body, so that the upper surface of the battery cell 8 is not compressed and deformed.

[0053] Example 2

[0054] Based on the above-described high-voltage electric safety protection structure for battery packs, this embodiment of the invention also provides a battery pack having the high-voltage electric safety protection structure described in the above embodiments. Since the high-voltage electric safety protection structure for battery packs has the above-described technical effects, the technical effects of the battery pack using this high-voltage electric safety protection structure can be found in the above embodiments.

[0055] Example 3

[0056] Based on the above-described high-voltage electric safety protection structure for the battery pack, this embodiment of the invention also provides a vehicle in which the high-voltage electric safety protection structure for the battery pack described in the above embodiment is provided in the vehicle body. Since the high-voltage electric safety protection structure for the battery pack has the above-described technical effects, the technical effects of the battery pack using the high-voltage electric safety protection structure for the battery pack can be found in the above embodiments.

[0057] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-voltage electrical safety protection structure for a battery pack, applicable to a vehicle body bracket, the vehicle body bracket including an overlapping rear seat crossbeam and a central channel, characterized in that, Including the battery pack casing used to carry the battery cells; The battery pack housing has opposing support members inside, and there is a space for installing electrical components between the support members. There is also a space for installing battery cells between the battery pack housing and the support members. The height of the support member is higher than the upper surface of the battery cell, and the support member is located directly below the joint between the central channel and the rear crossbeam of the seat, so as to bear the downward extrusion force generated at the joint under the side column collision condition. The support member includes a plate body, and a plurality of side plates are provided on one side of the plate body, and the plurality of side plates are evenly distributed along the length direction of the plate body. The plate has multiple longitudinal channels, which are evenly distributed along the length of the plate and penetrate the plate along its height. The longitudinal section of the side plate is trapezoidal.

2. The high-voltage electrical safety protection structure for the battery pack as described in claim 1, characterized in that, The top of the plate and the bottom of the side plate are respectively provided with mounting through holes, and a reinforcing member is provided inside the battery pack housing, the reinforcing member being located at the bottom of the battery pack housing; The plate and the side plate are connected to the reinforcing member by bolts and through the mounting holes.

3. The high-voltage electrical safety protection structure for the battery pack as described in claim 1, characterized in that, A groove is provided on one side of the side plate.

4. The high-voltage electrical safety protection structure for the battery pack as described in claim 1, characterized in that, The bottom of the battery pack housing is provided with a battery pack mounting frame, which surrounds the battery pack housing.

5. The high-voltage electrical safety protection structure for the battery pack as described in claim 1, characterized in that, The support component is a cast aluminum part.

6. A battery pack, characterized in that, The battery pack high-voltage electrical safety protection structure includes any one of claims 1-5.

7. A vehicle, characterized in that, The battery pack high-voltage electrical safety protection structure includes any one of claims 1-5.

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