Connecting structure of battery pack box body

By using rivet nuts in the flange, heightened, and collapsible sections of the battery pack housing structure, combined with fasteners and the connection between the bottom protective plate and the housing structure, the problem of the bottom protective plate not being able to be directly connected is solved, achieving a stable connection and support effect, and adapting to the influence of the liquid cooling plate flow channel.

CN223728931UActive Publication Date: 2025-12-26HEFEI GUOXUAN HIGH TECH POWER ENERGY
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Patent Information

Application Number
CN202520010812.8
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-01-03
Publication Date
2025-12-26
Estimated Expiration
2035-01-03

AI Technical Summary

Technical Problem

In existing liquid-cooled integrated enclosure structures, the bottom protective plate cannot be directly connected to the enclosure structure and cannot provide support, resulting in limitations in the connection, especially in the absence of ribs, where an effective connection cannot be achieved.

Method used

The structure employs a flange section, a raised section, and a collapsible section with rivet nuts. It is connected to the bottom protective plate body via fasteners. The edges of the box structure are welded to the bottom protective plate body. The raised section and the collapsible section of the rivet nuts are inserted into the box structure, and the bottom protective plate body is directly connected to and supported by the box body in combination with fasteners.

Benefits of technology

It achieves direct connection between the bottom protective plate and the box structure without concave ribs, avoids the influence of liquid cooling plate flow channels, enhances the stability and support effect of the connection, reduces stress, and adapts to a greater installation distance.

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Abstract

The utility model relates to a connecting structure of a battery pack box body, which belongs to the technical field of power batteries and comprises a box body structure, a bottom protective plate body and a rivet nut, the rivet nut comprises a flange part, a heightening part and a crumple part which are sequentially connected along the vertical direction, and a through hole which sequentially penetrates through the heightening part and the flange part is arranged in the flange part. The joint of the heightening part and the crumple part is arranged on the box body structure in a penetrating mode, the bottom protection plate body is connected with the through hole through a fastener, and the edge of the box body structure is welded to the edge of the bottom protection plate body. According to the utility model, the joint of the heightening part and the crumple part is arranged on the box body structure in a penetrating manner, the bottom protection plate body is connected with the through hole of the rivet nut through the fastener, and one end, far away from the heightening part, of the flange part is in contact with the bottom protection plate body, so that the limitation of connection is broken, and the bottom protection plate body can be directly connected with the box body structure without a concave rib; and the purpose of supporting is also achieved.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery technical field, especially relate to a connecting structure of battery pack box. BACKGROUND

[0002] In the rapid development process of new energy vehicles, the structure of battery pack is more and more, and the design of the bottom guard plate body of the battery pack box structure also has various requirements. In the existing liquid cooling integrated box structure, due to the reason of the liquid cooling plate flow channel, the bottom guard plate body cannot be directly connected with the box structure frame without recessed rib, and cannot be supported, and the connection has limitations. UTILITY MODEL CONTENTS

[0003] In view of the above problems, the utility model provides a connecting structure of battery pack box, including box structure, bottom guard plate body, rivet nut, the rivet nut includes flange portion, high part and collapse portion connected in sequence along the vertical direction, the flange portion is equipped with through hole in sequence penetrating high part and flange portion, the connecting place of high part and collapse portion is arranged on the box structure, the bottom guard plate body is connected with through hole through fastener, the edge of box structure is welded with the edge of bottom guard plate body.

[0004] Further, the part of the through hole located in the collapse portion is provided with a thread.

[0005] Further, the box structure includes a box frame and a liquid cooling plate, the liquid cooling plate is arranged in the box frame, the edge of the box frame is welded with the bottom guard plate body, the high part is arranged on the liquid cooling plate, and the collapse part is arranged on the box frame.

[0006] Further, the liquid cooling plate is provided with a via hole at the position of the crossbeam of the box frame, and the via hole is provided with a rivet nut.

[0007] Further, the crossbeam of the box frame is provided with a mounting hole coaxial with the via hole, and a part of the collapse part is accommodated in the mounting hole.

[0008] Further, the bottom guard plate body is provided with a connecting hole coaxial with the via hole, and the connecting hole is provided with a fastener connected with the rivet nut.

[0009] Further, the diameter of the flange portion is 15-35mm.

[0010] Further, the height of the high part is 3-20mm.

[0011] Further, the shapes of the high part and the collapse part are both cylindrical or hexagonal prismatic.

[0012] Further, the diameters of the flange portion, the high part and the collapse part are sequentially reduced.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1) The connecting part of the heightening part and the collapsing part is arranged on the box structure, the bottom guard plate body is connected with the through hole of the pull rivet nut through the fastener, and the end, away from the heightening part, of the flange part is in contact with the bottom guard plate body, so that the limitation of connection is broken, the bottom guard plate body can be directly connected with the box structure without the recessed rib, and the supporting purpose is achieved.

[0015] 2) The edge of the box structure is welded with the bottom guard plate body, so that the connectivity between the box structure and the bottom guard plate body is ensured again, and the bottom guard plate body achieves the supporting purpose.

[0016] 3) The utility model can avoid the influence of the flow channel of the liquid cooling plate, and realize the connection of the bottom guard plate body without the recessed rib and the frame.

[0017] 4) The flange part of the pull rivet nut can increase the contact area and reduce the stress, and the heightening part can increase the distance between the collapsing part and the flange part, so that the pull riveting is realized under the condition that the distance between the flange part and the pull riveting surface is far.

[0018] Other features and advantages of the utility model will be described in the subsequent description, and some of them will become apparent from the description, or will be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the structure indicated in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0020] Figure 1 A schematic view of the connecting structure of the battery pack box is shown;

[0021] Figure 2 A structural schematic view of the pull rivet nut is shown;

[0022] Figure 3 A structural schematic view of the box frame is shown;

[0023] Figure 4 A schematic view of the pull rivet nut connecting the box frame and the liquid cooling plate is shown;

[0024] Figure 5 An explosion view of the connecting structure of the battery pack box is shown.

[0025] Fig. 1, pull rivet nut; 11, flange part; 12, heightening part; 13, collapsing part; 14, through hole; 15, fastener; 2, box frame; 21, cross beam; 22, mounting hole; 3, liquid cooling plate; 31, via hole; 4, bottom guard plate body; 41, connecting hole. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely explained in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the protection scope of the utility model.

[0027] Figure 1 The connecting structure of the battery pack box body is shown. As shown in Figure 1 The connecting structure of the battery pack box body is shown. As shown in Figure 2 The structure diagram of the pull rivet nut 1 is shown. As shown in Figure 2 The structure diagram of the pull rivnut 1 is shown. As shown in Figure 5 The structure diagram of the pull rivnut 1 is shown. As shown in Figure 5 The structure diagram of the pull rivnut 1 is shown. As shown in

[0028] The connecting structure of the battery pack box body is shown. As shown in

[0029] Specifically, the edge of the box structure is welded with the edge of the bottom guard plate body 4; the connectivity between the box structure and the bottom guard plate body 4 can be ensured again, so that the bottom guard plate body 4 achieves the purpose of support.

[0030] In some embodiments, the flange part 11 is in contact with the bottom guard body 4 away from one end of the raised part 12; after contact, it is convenient to install the fastener 15, and after the fastener 15 is installed, the purpose of connecting the bottom guard and the box structure can be achieved.

[0031] In some embodiments, the through hole 14 is threaded at the position of the collapse part 13, which facilitates the use of the screw rod on the rivet gun of the external equipment to pull the collapse part 13 of the pull rivet nut 1.

[0032] Figure 4 The schematic diagram of the pull rivet nut 1 connecting the box frame 2 and the liquid cooling plate 3 is shown. As Figure 4 shown, in some embodiments, the box structure includes a box frame 2 and a liquid cooling plate 3, the liquid cooling plate 3 is arranged in the box frame 2, the edge of the box frame 2 is welded with the bottom guard body 4, the raised part 12 is arranged on the liquid cooling plate 3, and the collapse part 13 is arranged on the box frame 2; the edge of the box frame 2 is welded with the bottom guard body 4, which can again guarantee the connectivity between the box structure and the bottom guard body 4, so that the bottom guard body 4 achieves the purpose of support;

[0033] In some embodiments, the liquid cooling plate 3 is provided with a through hole 31 at the position of the cross beam 21 of the box frame 2, and the pull rivet nut 1 is arranged in the through hole 31; the through hole 31 provides installation conditions for the pull rivet nut 1.

[0034] In some embodiments, the liquid cooling plate 3 is provided with a plurality of through holes 31 at the position of the cross beam 21 of the box frame 2; the plurality of through holes 31 provide installation conditions for the plurality of pull rivet nuts 1.

[0035] Figure 3 The structural schematic diagram of the box frame 2 is shown. As Figure 3 shown, in some embodiments, the cross beam 21 of the box frame 2 is provided with a mounting hole 22 coaxial with the through hole 31, and a part of the collapse part 13 is accommodated in the mounting hole 22; the mounting hole 22 provides installation conditions for the pull rivet nut 1.

[0036] In some embodiments, the cross beam 21 of the box frame 2 is provided with a plurality of mounting holes 22; the plurality of mounting holes 22 provide connection conditions for the installation of the bottom guard body 4.

[0037] In some embodiments, the bottom guard body 4 is provided with a connecting hole 41 coaxial with the through hole 31, and the connecting hole 41 accommodates the fastener 15 connected with the pull rivet nut 1; the connecting hole 41 is coaxial with the through hole 31, which can provide installation conditions for the fastener 15, so as to fix the box structure and the bottom guard body 4.

[0038] In some embodiments, the bottom guard plate body 4 is provided with a plurality of connecting holes 41; the plurality of connecting holes 41 provide connecting conditions for installing the bottom guard plate body 4.

[0039] In some embodiments, the diameter of the flange part 11 is 15-35 mm; the flange part 11 with a diameter of 15-35 mm can increase the contact area and reduce stress to avoid deformation; the flange part 11 with a diameter of 15-35 mm and the raised part 12 can realize the pull riveting in the case that the distance between the flange part 11 and the pull riveting installation surface is far.

[0040] In some embodiments, the diameter of the flange part 11 is 20 mm; the flange part 11 with a diameter of 20 mm can increase the contact area and reduce stress to avoid deformation; the flange part 11 with a diameter of 20 mm and the raised part 12 can realize the pull riveting in the case that the distance between the flange part 11 and the pull riveting installation surface is far.

[0041] In some embodiments, the height of the raised part 12 is 3-20 mm; the raised part 12 with a height of 3-20 mm can increase the distance between the collapse part 13 and the flange part 11; the raised part 12 with a height of 3-20 mm and the flange part 11 with a diameter of 15-35 mm can realize the pull riveting in the case that the distance between the flange part 11 and the pull riveting installation surface is far.

[0042] In some embodiments, the height of the raised part 12 is 10 mm; the raised part 12 with a height of 10 mm can increase the distance between the collapse part 13 and the flange part 11; the raised part 12 with a height of 10 mm and the flange part 11 with a diameter of 20 mm can realize the pull riveting in the case that the distance between the flange part 11 and the pull riveting installation surface is far.

[0043] In some embodiments, the shapes of the raised part 12 and the collapse part 13 are both cylindrical or hexagonal; the raised part 12 and the collapse part 13 in cylindrical or hexagonal shape are convenient for connecting the box body structure and the bottom guard plate body 4; the collapse part 13 in cylindrical or hexagonal shape is convenient for later longitudinal compression to fix the connection between the box body frame 2 and the liquid cooling plate 3.

[0044] In some embodiments, the diameters of the flange part 11, the raised part 12 and the collapse part 13 decrease in turn, which is convenient for connecting the bottom guard plate body 4, the liquid cooling plate 3 and the box body frame 2 in turn; the size of the diameter of the flange part 11 can increase the contact area and reduce stress; the size of the diameter of the raised part 12 can play a connecting limiting role on the position of the pull rivet nut 1; the size of the diameter of the collapse part 13 determines the size of the collapse part 13 after collapse.

[0045] In some embodiments, the fastener 15 is a bolt; the bolt can fix the box body structure and the bottom guard plate body 4 to achieve the purpose of support.

[0046] In some embodiments, the fastener 15 is a plug weld block; the plug weld block can fix the box structure and the bottom guard plate body 4, so as to achieve the purpose of support; the plug weld block is melted by using a plug welding process, so as to connect the box structure and the bottom guard plate body 4.

[0047] The working principle of the connecting structure of the battery pack box is as follows:

[0048] The bottom guard plate body 4 and the box structure are connected by using the pull rivet nut 1 and the fastener 15. Among them, a plurality of mounting holes 22 are first punched at the beam 21 part of the box frame 2, a plurality of through holes 31 are then punched at the part of the liquid cooling plate 3 located at the beam 21 of the box frame 2, a plurality of connecting holes 41 are then punched on the bottom guard plate body 4, the pull rivet nut 1 is then placed into the coaxial through hole 31 and the mounting hole 22, the screw rod on the external equipment rivet gun is used to pull the pull rivet nut 1, the collapse part 13 of the pull rivet nut 1 is longitudinally compressed, so as to fix and connect the box frame 2 and the liquid cooling plate 3, the bottom guard plate body 4 is then placed on the box frame 2, the fastener 15 is placed into the connecting hole 41 of the bottom guard plate body 4 and the through hole 31, so as to connect the liquid cooling plate 3 and the bottom guard plate body 4, the edge of the box frame 2 is then welded with the edge of the bottom guard plate body 4, and the connection of the box frame 2, the liquid cooling plate 3 and the bottom guard plate body 4 is completed.

[0049] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent replacement to part of technical features in it, and these modifications or replacements do not make the essence of corresponding technical scheme deviate from the spirit and scope of the technical scheme of each embodiment of the utility model.

Claims

1. A connecting structure of a battery pack case, comprising a case structure, a bottom guard plate body (4), and a pull-rivet nut (1), characterized in that, The pull rivet nut (1) comprises a flange part (11), a heightening part (12) and a collapsing part (13) connected in sequence in the vertical direction, the flange part (11) is provided with a through hole (14) penetrating the heightening part (12) and the flange part (11) in sequence, the connecting part of the heightening part (12) and the collapsing part (13) is arranged on the box structure, the bottom guard plate body (4) is connected with the through hole (14) through the fastener (15), and the edge of the box structure is welded with the edge of the bottom guard plate body (4).

2. The connecting structure of the battery pack case according to claim 1, characterized by, The through hole (14) is provided with a thread at the position of the collapsing part (13).

3. The connecting structure of the battery pack case according to claim 1, wherein The box structure comprises a box frame (2) and a liquid cooling plate (3), the liquid cooling plate (3) is arranged in the box frame (2), the edge of the box frame (2) is welded with the bottom guard plate body (4), the heightening part (12) is arranged on the liquid cooling plate (3), and the collapsing part (13) is arranged on the box frame (2).

4. The connecting structure of the battery pack case according to claim 3, characterized by, The liquid cooling plate (3) is provided with a via hole (31) at the position of the cross beam (21) of the box frame (2), and the pull rivet nut (1) is arranged in the via hole (31).

5. The connecting structure of the battery pack case according to claim 3, wherein The cross beam (21) of the box frame (2) is provided with a mounting hole (22) coaxial with the via hole (31), and a part of the collapsing part (13) is arranged in the mounting hole (22).

6. The connecting structure of the battery pack case according to any one of claims 3 to 5, characterized by The bottom guard plate body (4) is provided with a connecting hole (41) coaxial with the via hole (31), and the connecting hole (41) is arranged in the bottom guard plate body (4).

7. The connecting structure of a battery pack case according to claim 1, wherein The diameter of the flange part (11) is 15-35 mm.

8. The connecting structure of a battery pack case according to claim 1, wherein The height of the heightening part (12) is 3-20 mm.

9. The connecting structure of a battery pack case according to claim 1, wherein The shape of the heightening part (12) and the collapsing part (13) is cylindrical or hexagonal.

10. The connection structure of the battery pack case according to claim 1, characterized by, The diameters of the flange part (11), the heightening part (12) and the collapsing part (13) are sequentially reduced.