A frame assembly for a power battery and a power battery pack and a vehicle body assembly having the frame assembly

Abstract

The application relates to the field of battery packs, in particular to a frame assembly for a power battery, a power battery pack with the frame assembly and a vehicle body assembly, which comprises an inner frame and an outer frame; the outer frame is arranged at the periphery of the inner frame; the inner frame and the outer frame are connected through a flexible connecting mechanism; the flexible connecting mechanism comprises a connecting part; the connecting part comprises an elastic pin arranged on the inner frame; the elastic pin is connected on the outer frame through a fastener; the strength of the elastic pin is lower than that of the outer frame and the inner frame; the frame assembly disclosed in the application adopts a double-frame structure; the installation of the battery pack is facilitated, the installation and fixation of the frame assembly on the vehicle body are facilitated, and when the vehicle body structure is greatly deformed in an accident, the deforming force cannot directly act on the power battery module on the inner frame.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery pack, in particular to a frame assembly for power battery and a power battery pack and a vehicle body assembly with the frame assembly. BACKGROUND

[0002] At present, most domestic automobile manufacturers develop slowly in the direction of new pure electric vehicle design and development platform, and more of them use and modify the development platform of fuel vehicles to improve the speed of putting the early models in the field of pure electric vehicles.

[0003] The advantages of modifying the development platform of traditional fuel vehicles are that the design, molds and parts can be shared with traditional fuel vehicles, the speed of putting the early models is faster, and the early cost can be better controlled. However, the disadvantages are also obvious. Since there is no specific reserved space for power batteries, the rear seat space and the storage space of the trunk are often occupied, the layout of power batteries cannot be optimized, the matching of the thermal management system is more difficult, and the unreasonable layout makes it impossible to optimize the vehicle's balance weight, resulting in poor vehicle power performance.

[0004] There is an urgent need for a power battery arrangement that meets the performance requirements of the vehicle while having relatively low development costs.

[0005] In addition, the protection of power batteries has always been an important research direction in the field of pure electric vehicles. The protection structure of power batteries and the prevention of battery failure have become key technologies in the field of pure electric vehicles, and have important research value.

[0006] At the same time, the actual use of the vehicle is complex and variable, such as the bending deformation of the vehicle body when it is loaded, the torsional deformation when one wheel is off the ground, etc. All of these will interact with the power battery system fixed to the vehicle body, causing synchronous deformation, which is easy to cause battery failure and danger.

[0007] The existing patent CN112757885A - a general improvement method for the connection structure of the middle mounting point of the battery pack and the vehicle body does not explicitly disclose the technical content to solve the above problems.

[0008] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery pack structure. SUMMARY

[0009] The purpose of the present application is to provide a frame structure for a power battery pack with strong anti-deformation ability.

[0010] In order to achieve the above purpose, the technical scheme adopted by the present application is:

[0011] A frame assembly for a power battery, comprising an inner frame and an outer frame; the outer frame is arranged on the periphery of the inner frame; the inner frame and the outer frame are connected through a flexible connecting mechanism;

[0012] The flexible connecting mechanism comprises a connecting part; the connecting part comprises an elastic pin arranged on the inner frame; the elastic pin is connected to the outer frame through a fastener; the strength of the elastic pin is lower than the strength of the outer frame and the inner frame.

[0013] The elastic pin is provided with a connecting disc, the connecting disc is provided with an assembly hole, and the connecting disc is fastened to the inner frame through the fastener passing through the assembly hole.

[0014] The inner frame is provided with an assembly groove for placing the connecting disc.

[0015] The flexible connecting mechanism comprises a plurality of connecting parts, and the opposite sides of the inner frame are connected to the outer frame through at least one connecting part.

[0016] The outer frame comprises an outer frame body, the side surface of the outer frame body is provided with a lateral fixing support, and the outer frame is lapped on the mounting beam of the vehicle body frame through the lateral fixing support.

[0017] The end of the outer frame body is provided with a rear fixing support, and the rear fixing support is hoisted on the vehicle body frame.

[0018] The height of the rear fixing support is greater than the thickness of the outer frame.

[0019] The inner frame is provided with a connector, the outer frame is provided with a mounting hole, a high-voltage connector is arranged in the mounting hole, and the high-voltage connector is connected to the connector on the inner frame through the mounting hole.

[0020] A power battery pack comprising the frame assembly for the power battery and a shield, the shield is connected to the inner frame, and a sealing gasket is arranged between the shield and the inner frame.

[0021] A vehicle body assembly comprising a vehicle body frame, the vehicle body frame is provided with two spaced mounting beams; the two mounting beams are hung with the power battery pack.

[0022] The vehicle body frame is provided with a fixing support; the vehicle body frame is connected to the rear fixing support in the frame assembly for the power battery through the fixing support.

[0023] The advantages of the present application are:

[0024] The application discloses a frame assembly for a power battery, a power battery pack and a vehicle body assembly with the frame assembly.

[0025] The frame assembly disclosed by the application adopts a double-frame structure; the installation of the battery pack is facilitated, and meanwhile the installation and fixation of the frame assembly on the vehicle body are facilitated.

[0026] In the application, the inner frame and the outer frame can be relatively deformed and displaced under a large load due to the flexible connecting mechanism, so when the vehicle body structure is greatly deformed (bending deformation, torsional deformation, etc.) in an accident, the deforming force will not directly act on the power battery module on the inner frame, the force directly causes the connecting part in the flexible connecting mechanism to be deformed or disconnected, so that the inner frame is relatively displaced, the deforming force from the vehicle body structure is effectively blocked, and the safety of the power battery system is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] The following is a brief description of the content expressed by each drawing in the specification of the application and the marks in the drawings:

[0028] Figure 1 It is a structural schematic view of the application.

[0029] Figure 2 It is a top view and a partial enlarged view of the application.

[0030] Figure 3 It is a structural schematic view of the connecting part in the application.

[0031] Figure 4 It is a side view of the connecting part in the application.

[0032] Figure 5 It is a structural schematic view of the power battery pack in the application.

[0033] Figure 6 It is an explosion view of the inner frame and the shield in the application.

[0034] Figure 7 It is a structural schematic view when the application is installed on the vehicle body frame.

[0035] The marks in the above drawings are as follows:

[0036] 1, frame assembly, 11, inner frame, 12, outer frame. DETAILED DESCRIPTION

[0037] The specific embodiments of the application will be further described in detail below by comparing the drawings and by describing the optimal embodiments.

[0038] A frame assembly 1 for a power battery includes an inner frame 11 and an outer frame 12; the outer frame 12 is arranged outside the inner frame 11; the frame assembly 1 disclosed by the application adopts a double-frame structure; the installation of the battery pack is facilitated, and meanwhile the installation and fixation of the frame assembly 1 on the vehicle body are facilitated.

[0039] In addition, in the present application, the inner frame 11 and the outer frame 12 are connected through a flexible connecting mechanism; in the present application, the inner frame 11 and the outer frame 12 can be relatively deformed and displaced under a large load, so that when the vehicle body structure is deformed (bending deformation, torsional deformation, etc.) in an accident, the deformation force will not directly act on the power battery module on the inner frame 11, and the force will directly cause the connecting part 2 in the flexible connecting mechanism to deform or break, causing the inner frame 11 to relatively displace, effectively blocking the deformation force from the vehicle body structure, and ensuring the safety of the power battery system.

[0040] Meanwhile, in the present application, the flexible connecting mechanism includes a connecting part 2; the connecting part 2 is mainly used for connecting the inner frame 11 and the outer frame 12; and serves as a connecting piece.

[0041] In addition, in the present application, the inner frame 11 and the outer frame 12 are arranged in a spaced manner; in this way, a good partitioning effect can be achieved, and in subsequent use, the inner frame 11 and the outer frame 12 can be separated by breaking the connecting part 2.

[0042] Meanwhile, in the present application, the connecting part 2 includes an elastic pin 21 arranged on the inner frame 11; the elastic pin 21 is connected to the outer frame 12 through a fastener; the strength of the elastic pin 21 is lower than that of the outer frame 12 and the inner frame 11; the elastic pin 21 is essentially equivalent to a plug-in column structure, facilitating the plug-in connection between the inner frame 11 and the outer frame 12; in the present application, one end of the elastic pin 21 is connected to the inner frame 11, and the other end is connected to the fastener penetrating through the outer frame 12; based on the cooperation of the fastener and the elastic pin 21, the connection and fixation between the inner frame 11 and the outer frame 12 are realized.

[0043] Meanwhile, in the present application, the elastic pin 21 is also called a spring pin, which is mainly used for positioning, connecting and fixing between the inner frame 11 and the outer frame 12.

[0044] The fastener can be a fastening screw 24 or other fastener structure.

[0045] Further, in the present application, the elastic pin 21 is provided with a connecting disc 22; the connecting disc 22 and the elastic pin 21 can be an integral structure, or two components which are fixed together by welding or other connection methods; in the present application, the connecting disc 22 is provided with an assembly hole; the assembly hole is essentially a hole formed on the connecting disc 22, facilitating the subsequent penetration of the fastener 23; in the present application, the connecting disc 22 is fastened to the inner frame 11 through the fastener 23 penetrating through the assembly hole; in the present application, the connecting disc 22 is provided with four holes which are uniformly and circumferentially spaced on the connecting disc 22; such arrangement can well stabilize the installation position of the connecting disc 22 on the inner frame 11.

[0046] Further, the inner frame 11 is provided with an assembly groove 25 for placing the connecting plate 22; the assembly groove 25 is essentially a groove structure arranged on the outer side of the inner frame 11, which is used for placing and limiting the connecting plate 22, avoiding the deviation of the connecting plate 22 on the inner frame 11, and ensuring the accuracy of the placement position of the connecting plate 22.

[0047] Further, the flexible connecting mechanism includes a plurality of connecting portions 2, and the inner frame 11 is connected to the outer frame 12 through at least one connecting portion 2 on each side; such arrangement can realize the gap cooperation between the inner frame 11 and the outer frame 12, and facilitate the reduction of driving the inner frame 11 after the subsequent bending of the outer frame 12.

[0048] In actual arrangement, the inner frame 11 is connected to the outer frame 12 through at least three connecting portions 2 on each side, and at least one connecting portion 2 is arranged at each end and the middle of each side; such arrangement can ensure the stability of the arrangement of the inner frame 11 in the outer frame 12, and avoid the tilting of the inner frame 11.

[0049] Further, the outer frame 12 includes an outer frame body, the outer side of the outer frame body is provided with a lateral fixing support 3, and the outer frame 12 is lapped on the mounting beam 9 of the vehicle body frame 10 through the lateral fixing support 3; the lateral fixing support 3 is arranged in the application, which facilitates the lapping of the power battery frame assembly 1 on the vehicle body frame 10, and the outer frame 12 is a connecting piece of the power battery frame assembly 1 on the vehicle body frame 10 in the application; the lateral fixing support 3 is used for cooperating with the mounting beam 9 on the vehicle body frame 10; which facilitates the hanging of the power battery frame assembly 1 on the vehicle body frame 10; in addition, the lateral fixing support 3 is arranged on each side of the outer frame 12 in the application, which serves as a hanging ear and facilitates the hanging installation of the power battery frame assembly 1.

[0050] Meanwhile, the end of the outer frame 12 body is provided with a rear fixing support 4, and the rear fixing support 4 is hung on the vehicle body frame 10; such arrangement can realize the secondary installation and positioning of the power battery frame assembly 1 on the vehicle body frame 10, and better ensure the accuracy of the installation of the power battery frame assembly 1 on the vehicle body frame 10.

[0051] In addition, the height of the rear fixing support 4 is greater than the thickness of the outer frame 12 in the application; such arrangement facilitates the connection between the subsequent fixing support and the vehicle body frame 10.

[0052] Further, the inner frame 11 is provided with a connector 51 in the application, the outer frame 12 is provided with a mounting hole 13, the high-voltage connector 6 is arranged in the mounting hole 13, and the high-voltage connector 6 is connected with the connector 51 on the inner frame 11 through the mounting hole 13; the mounting hole 13 plays a role of avoiding, and facilitates the lap joint installation of the high-voltage connector 6 on the outer frame 12; at the same time, the inner frame 11 and the outer frame 12 are both rectangular frame structures in the application.

[0053] A power battery pack, comprising a frame assembly 1 for power battery and a shield 7 connected to the inner frame 11, and a sealing washer 5 arranged between the shield 7 and the inner frame 11; the shield 7 and the inner frame 11 form a storage cavity of the battery module, facilitating the placement of the battery module in the battery pack, and the sealing washer 5 plays a good sealing role, ensuring the sealing of the connection between the shield 7 and the inner frame 11.

[0054] A vehicle body assembly, comprising a vehicle body frame 10 provided with two installation beams 9 arranged at intervals; the two installation beams 9 are hung with the power battery pack; the vehicle body frame 10 is provided with two installation beams 9, which act as hanging beams, facilitating the hanging of the power battery pack in subsequent use; in subsequent use, the power battery pack is hung on the installation beam 9 through the lateral fixing support 3 in the frame assembly 1; therefore, the installation of the power battery pack on the vehicle body frame 10 is facilitated.

[0055] Further, the vehicle body frame 10 is provided with a fixing support 8 in the application; the vehicle body frame 10 is connected with the rear fixing support 4 in the frame assembly 1 for power battery through the fixing support 8; the fixing support 8 plays a bridging role, and the fixing support 8 and the rear fixing support 4 are mutually butted, so as to realize the installation connection between the fixing support 8 and the rear fixing support 4; the stability of the installation of the power battery pack on the vehicle body frame 10 is better ensured.

[0056] Specifically:

[0057] The power battery pack disclosed in the application is connected with the vehicle body frame 10 through the lateral fixing support 3 and the rear fixing support 4 in the frame assembly 1 for power battery.

[0058] The inner frame 11 and the outer frame 12 are provided with a flexible connecting mechanism in the application.

[0059] In the application, the power battery pack is connected with each beam in the vehicle body frame 10 by bolts and is suspended under the vehicle body floor.

[0060] The vehicle body frame 10 is provided with a fixing support 8 at the bottom, and the power battery installation beam 9 is arranged in the inner side of the rocker beam of the vehicle body frame 10.

[0061] The outer frame 12 of the power battery pack is provided with a plurality of lateral fixing supports 3 and a rear fixing support 4; the lateral fixing supports 3 are overlapped on the mounting beams 9 of the body frame 10; and the rear fixing support 4 is connected with the fixing support 8 on the body frame 10.

[0062] The power battery module is placed in the inner frame 11, and the inner frame 11 is connected with the outer frame 12 through the connecting part 2, so that the connection between the outer frame 12 and the inner frame 11 is a non-forced fixed connection, the structural rigidity of the connecting part 2 is relatively low compared with the structural rigidity of the inner and outer frames 12, and the relatively flexible connection is formed.

[0063] The connecting part 2 specifically includes an elastic pin 21, and the elastic pin 21 is provided with a connecting disc 22 which is fastened on the inner frame 11 through a locking nut.

[0064] The elastic pin 21 is connected to the inner frame 11 through four locking nuts, Figure 6 , and the opposite side of the elastic pin 21 is connected to the side beam of the outer frame 12 through a locking screw 24, so as to form the flexible connection between the inner and outer frames 12.

[0065] The power battery pack cover 7 is provided with bolt holes 71 around, and is connected with the inner frame 11 assembly 1 through bolts and sealing washers 5.

[0066] The arrangement scheme of the power battery pack of the application does not sacrifice the original vehicle body space, and is suitable for various fuel vehicle body systems and has strong universality; the inner frame 11 assembly 1 can carry a standardized power battery pack, and the battery interchangeability is strong.

[0067] The outer frame 12 is connected with the beams at the lower part of the vehicle body through the lateral fixing supports 3 and the rear fixing support 4 on both sides by bolts; when the vehicle body bears a large load and is bent and deformed downward, the beam structure at the lower part of the vehicle body is directly bent and deformed, so that the outer frame 12 fixedly connected therewith is extruded and deformed; since the inner frame 11 and the outer frame 12 are connected through the flexible connecting part 2, the deformation force on the outer frame 12 is blocked by the connecting part 2, and if the deformation force is too large, the connecting part 2 can be disconnected, and the inner frame 11 and the outer frame 12 are relatively displaced, so that the deformed vehicle body structure directly extrudes the inner frame 11 assembly 1, and the safety of the power battery system after the deformation of the beam structure at the lower part of the vehicle body under the action of a large load is improved.

[0068] When the lower part of the vehicle body structure is deformed by a large torsion, the battery outer frame 12 is deformed by a large torsion synchronously, the connecting part 2 between the battery outer frame 12 and the battery inner frame 11 is deformed to compensate, the relative displacement between the battery inner frame 11 and the outer frame 12 is caused, the torsion load on the vehicle body cannot be transmitted to the battery inner frame 11, the damage of the power battery system caused by the large torsion deformation of the lower part of the vehicle body structure is effectively avoided, the safety of the power battery pack in the automobile accident is improved, and the secondary injury of the vehicle caused by the battery accident is avoided.

[0069] The battery pack and the beam structure of the lower part of the vehicle body are connected by bolts, the battery inner frame 11 and the outer frame 12 are made of aluminum alloy material, the weight of the power battery system is effectively reduced, and the standard power battery module is carried by the inner frame 11, so that the universality is high.

[0070] The power battery comprises the design of the inner frame 11 and the outer frame 12, the battery pack forms the inner-outer double-frame structure, the outer frame 12 is connected with the beam structure of the lower part of the vehicle body frame 10, the inner-outer frame 12 is connected through the connecting part 2, the inner-outer frame 12 can be deformed and displaced relatively under a large load, so when the vehicle body structure is deformed (bending deformation, torsion deformation, etc.) in an accident, the deformation force cannot directly act on the power battery module on the inner frame 11, the force directly causes the connecting part 2 to be deformed or disconnected, the inner frame 11 is displaced relatively, the deformation force from the vehicle body structure is effectively blocked, the large deformation of the battery in the vehicle accident is effectively avoided to cause the secondary accident, and the safety of the battery is improved.

[0071] Obviously, the specific implementation of the present application is not limited by the above-mentioned mode, and various non-essential improvements adopting the method concept and technical scheme of the present application are within the protection scope of the present application.

Claims

1. A frame assembly for a power battery, characterized in that: It comprises an inner frame and an outer frame; the outer frame is arranged outside the inner frame; the inner frame and the outer frame are connected by a flexible connection mechanism; The flexible connection mechanism includes a connection portion; the connection portion includes an elastic pin provided on the inner frame; the elastic pin is connected to the outer frame via a fastener; the elastic pin has a strength lower than that of the outer frame and the inner frame; The elastic pin is provided with a connecting plate, the connecting plate is provided with an assembly hole, and the connecting plate is fastened to the inner frame through a fastener passing through the assembly hole; The inner frame is provided with an assembly sink for placing the connecting disc.

2. A power battery frame assembly according to claim 1, characterized in that: The flexible connection mechanism includes a plurality of connection parts, and opposite sides of the inner frame are respectively connected to the outer frame through at least one connection part.

3. The power battery frame assembly according to claim 1, characterized in that: The outer frame includes an outer frame body, a lateral fixing bracket is provided on the side of the outer frame body, and the outer frame is overlapped on the mounting beam of the vehicle body frame through the lateral fixing bracket; A rear fixing bracket is provided at the end of the outer frame body, and the rear fixing bracket is hoisted on the vehicle body frame.

4. A power battery frame assembly according to claim 3, characterized in that: The height of the rear fixing bracket is greater than the thickness of the outer frame.

5. The power battery frame assembly according to claim 1, characterized in that: The inner frame is provided with a connector, the outer frame is provided with a mounting hole, a high-voltage connector is provided in the mounting hole, and the high-voltage connector passes through the mounting hole and is connected to the connector on the inner frame.

6. A power battery pack, characterized in that: It comprises a frame assembly for a power battery as described in any one of claims 1 to 5 and a shield, wherein the shield is connected to an inner frame, and a sealing gasket is provided between the shield and the inner frame.

7. A vehicle body assembly, characterized in that: It comprises a vehicle body frame, on which two spaced-apart mounting beams are provided; the power battery pack as claimed in claim 6 is hung on the two mounting beams.

8. The vehicle body assembly according to claim 7, characterized in that: The vehicle body frame is provided with a fixed support; the vehicle body frame is connected to the rear fixing bracket of the power battery frame assembly through the fixed support.

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