A CTP battery pack structure

Abstract

The utility model provides a kind of CTP battery package structure belongs to new energy battery field.The structure includes lower box frame, crossbeam, stringer and reinforcing part, crossbeam and stringer are arranged in lower box frame, crossbeam is perpendicular to stringer, reinforcing part is arranged between crossbeam and lower box frame, reinforcing part is arranged between stringer and lower box frame.Using the CTP battery package structure provided in the utility model embodiment can solve the problem of low structural strength of the lower box in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of new energy batteries, and in particular to a CTP battery pack structure. Background Technology

[0002] Existing CTP (Cell to Pack) battery pack technology integrates battery cells directly onto the battery pack housing, eliminating the need for end plates, side plates, or steel strips required in traditional modules. This allows for higher cell density and greater flexibility in cell arrangement. However, this highly integrated cell assembly structure means that cell expansion and deformation can significantly impact the overall structure and performance of the battery pack. Therefore, when designing the lower housing of a CTP battery pack, it is necessary to consider the lower housing's strength, rigidity, bottom impact safety, insulation, and heat dissipation protection.

[0003] In existing technologies, crossbeams and longitudinal beams are usually added to the lower casing of CTP battery packs to improve the structural strength of the lower casing. However, the crossbeams and longitudinal beams are usually only welded to the lower casing frame. During triaxial double standard vibration tests, weld cracks are likely to appear between the crossbeams and longitudinal beams and the lower casing frame.

[0004] The existing CTP battery pack structure uses only welding to connect the crossbeams and longitudinal beams to the lower housing frame, which makes the weld cracks prone to occur during vibration, resulting in low structural strength of the lower housing. Utility Model Content

[0005] This utility model provides a CTP battery pack structure that solves the problem of low structural strength of the lower casing in the prior art. The technical solution is as follows: A CTP battery pack structure includes: a lower housing frame, crossbeams, longitudinal beams, and reinforcing members. The crossbeam and the longitudinal beam are arranged within the lower box frame. The crossbeam is perpendicular to the longitudinal beam. The reinforcing member is arranged between the crossbeam and the lower box frame, and the reinforcing member is arranged between the longitudinal beam and the lower box frame.

[0006] Optionally, the reinforcing member is detachably connected to the crossbeam, the longitudinal beam, and the lower housing frame.

[0007] Optionally, the reinforcing member includes an L-shaped sheet metal reinforcing plate and an embedded sheet metal reinforcing block. The longitudinal beam is connected to the lower box frame via the L-shaped sheet metal reinforcing plate. One surface of the L-shaped sheet metal reinforcing plate is connected to the top surface of the longitudinal beam, and the other surface is connected to the inner wall of the lower box frame. The crossbeam is connected to the lower box frame via the embedded sheet metal reinforcing block. A reinforcing sleeve is provided on one side of the embedded sheet metal reinforcing block, and the crossbeam is inserted into the reinforcing sleeve. The other side of the embedded sheet metal reinforcing block is connected to the inner wall of the lower box frame.

[0008] Optionally, an auxiliary reinforcing member is provided between the crossbeam and the longitudinal beam.

[0009] Optionally, the auxiliary reinforcement is located on the top surface of the crossbeam and the longitudinal beam, and the auxiliary reinforcement is cross-shaped.

[0010] Optionally, a short crossbeam is provided inside the lower box frame, and the short crossbeam is perpendicular to the longitudinal beam.

[0011] Optionally, a T-shaped sheet metal reinforcing plate is provided between the short crossbeam and the longitudinal beam, and the T-shaped sheet metal reinforcing plate is located on the top surface of the short crossbeam and the longitudinal beam.

[0012] Optionally, a liquid cooling plate is provided at the bottom of the lower housing frame, and a limiting strip is provided on the liquid cooling plate, the limiting strip being arranged along the length direction of the longitudinal beam.

[0013] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: This utility model provides a CTP battery pack structure that improves the connection strength between the crossbeam and the lower housing frame by setting a reinforcing member between the crossbeam and the lower housing frame, and improves the connection strength between the longitudinal beam and the lower housing frame by setting a reinforcing member between the longitudinal beam and the lower housing frame. Part of the reinforcing member is connected to the crossbeam or longitudinal beam, and the other part is connected to the lower housing frame, which can effectively solve the problem of low structural strength of the lower housing in the prior art. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is an exploded view of the overall structure provided in an embodiment of the present invention; Figure 2This is a top view of the overall structure provided in an embodiment of the present utility model; Figure 3 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of point A; Figure 4 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of point B; Figure 5 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of point C; Figure 6 This is provided by the embodiment of the present utility model. Figure 2 Enlarged diagram of point D; Figure 7 This is a schematic diagram of the embedded sheet metal reinforcing block structure provided in this embodiment of the utility model.

[0016] In the diagram: 1-Lower box frame; 2-Crossbeam; 21-Short crossbeam; 3-Longitudinal beam; 4-Reinforcing component; 41-L-shaped sheet metal reinforcing plate; 42-Embedded sheet metal reinforcing block; 421-Reinforcing sleeve; 43-Auxiliary reinforcing component; 44-T-shaped sheet metal reinforcing plate; 5-Liquid cooling plate; 51-Limiting strip; 6-Thermal conductive structural adhesive; 7-Bottom guard plate support foam; 8-Bottom guard plate sealing foam; 9-Bottom guard plate. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0018] Figure 1 This is an exploded view of the overall structure provided in an embodiment of the present invention; Figure 2 This is a top view of the overall structure provided in an embodiment of the present utility model; Figure 3 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of point A; Figure 4 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of point B; Figure 5 This is provided by the embodiment of the present utility model. Figure 2 Enlarged view of point C; Figure 6 This is provided by the embodiment of the present utility model. Figure 2 Enlarged diagram of point D; Figure 7 This is a schematic diagram of the embedded sheet metal reinforcing block structure provided in an embodiment of this utility model. Figures 1 to 7The CTP battery pack structure shown includes: a lower housing frame 1, a crossbeam 2, a longitudinal beam 3, and a reinforcing member 4. The crossbeam 2 and the longitudinal beam 3 are disposed inside the lower housing frame 1. The crossbeam 2 is perpendicular to the longitudinal beam 3. A reinforcing member 4 is disposed between the crossbeam 2 and the lower housing frame 1. A reinforcing member 4 is disposed between the longitudinal beam 3 and the lower housing frame 1.

[0019] Exemplarily, in this embodiment of the present invention, the lower housing frame 1 is constructed by welding extruded aluminum alloy profiles. The profiles require mold making, and the material is generally AL6063-T6 or AL6061-T6. The reinforcing member 4 can take various structural forms, such as right-angle reinforcing members, embedded reinforcing members, rivet nuts, and rivet connections. Any structural form that can strengthen the connection between the crossbeam 2 or longitudinal beam 3 and the lower housing frame 1 can be used as the reinforcing member 4 in this embodiment. After welding and fixing the crossbeam 2 or longitudinal beam 3 to the lower housing frame 1, it is further reinforced and fixed by the reinforcing member 4. When the battery pack structure is subjected to vibration and weld cracks occur, the crossbeam 2 or longitudinal beam 3 can still maintain its connection through the reinforcing member 4, preventing complete breakage from the lower housing frame 1. Compared with the traditional structure that only relies on weld seams, the structural mode and structural strength in this embodiment are better, thereby improving the structural strength of the battery pack structure.

[0020] The present invention provides a CTP battery pack structure that improves the connection strength between the crossbeam 2 and the lower housing frame 1 by providing a reinforcing member 4 between the crossbeam 2 and the lower housing frame 1, and improves the connection strength between the longitudinal beam 3 and the lower housing frame 1 by providing a reinforcing member 4 between the longitudinal beam 3 and the lower housing frame 1. Part of the reinforcing member 4 is connected to the crossbeam 2 or the longitudinal beam 3, and the other part is connected to the lower housing frame 1, which can effectively solve the problem of low structural strength of the lower housing in the prior art.

[0021] Optionally, the reinforcing member 4 is detachably connected to the crossbeam 2, the longitudinal beam 3, and the lower box frame 1.

[0022] For example, in this embodiment of the present invention, mounting holes are provided on the crossbeam 2, the longitudinal beam 3, and the reinforcing member 4. By means of screws and mounting holes, a part of the reinforcing member 4 is installed on the crossbeam 2 and the other part is installed on the lower housing frame 1, or a part of the reinforcing member 4 is installed on the longitudinal beam 3 and the other part is installed on the lower housing frame 1. This facilitates the subsequent disassembly and maintenance of the reinforcing member 4 by removing the screws. When the reinforcing member 4 is damaged by force, it is also convenient to replace it with a new reinforcing member 4. By setting this structure, the assembly process is simplified and the maintenance efficiency is improved.

[0023] Optionally, the reinforcing member 4 includes an L-shaped sheet metal reinforcing plate 41 and an embedded sheet metal reinforcing block 42. The longitudinal beam 3 is connected to the lower box frame 1 through the L-shaped sheet metal reinforcing plate 41. One side of the L-shaped sheet metal reinforcing plate 41 is connected to the top surface of the longitudinal beam 3, and the other side is connected to the inner wall of the lower box frame 1. The crossbeam 2 is connected to the lower box frame 1 through the embedded sheet metal reinforcing block 42. A reinforcing sleeve 421 is provided on one side of the embedded sheet metal reinforcing block 42, and the crossbeam 2 is inserted into the reinforcing sleeve 421. The other side of the embedded sheet metal reinforcing block 42 is connected to the inner wall of the lower box frame 1.

[0024] Exemplary, in embodiments of this utility model, such as Figure 2 , Figure 3 , Figure 4 and Figure 7 As shown, the longitudinal beam 3 is arranged along the length of the lower box frame 1, and is a continuous longitudinal member. It mainly bears in-plane shear, in-plane bending, and overall longitudinal stiffness. Its connection with the lower box frame 1 is usually a long straight seam or corner seam. It is more important to continuously transmit force and diffuse stress along the length direction, while also taking into account weight. Therefore, an L-shaped sheet metal reinforcing plate 41 is used to form a linear stiffening structure at the corner seam, achieving a long-distance stiffness improvement with a smaller thickness. The crossbeam 2 is arranged along the width of the lower box frame 1 and often bears torsion and out-of-plane bending. The ends are prone to peeling or "peeling force" in the direction of the flange opening and the concentration of triaxial force flow. Such triaxial force flow requires "filling" the nodes to increase the local section modulus and suppress peeling. An embedded sheet metal reinforcing block 42 is selected so that the crossbeam 2 is connected to the inner side wall of the lower box frame 1 after being inserted into the reinforcing sleeve 421, forming a short and thick three-dimensional load-bearing node structure, which improves the resistance to out-of-plane bending and peeling. By setting different reinforcing members 4 at different locations, the connection between various connecting parts becomes more stable, further improving the structural strength of this battery pack.

[0025] Optionally, an auxiliary reinforcing member 43 is provided between the crossbeam 2 and the longitudinal beam 3.

[0026] Exemplary, in embodiments of this utility model, such as Figure 5 As shown, by setting the auxiliary reinforcing member 43, the connection strength between the crossbeam 2 and the longitudinal beam 3 is further strengthened, thereby further improving the structural strength of this battery pack structure.

[0027] Optionally, the auxiliary reinforcing member 43 is located on the top surface of the crossbeam 2 and the longitudinal beam 3, and the auxiliary reinforcing member 43 is cross-shaped.

[0028] Exemplary, in embodiments of this utility model, such as Figure 5As shown, the auxiliary reinforcing member 43 is also installed on the top surface of the crossbeam 2 and the longitudinal beam 3 using blind rivets. Both the reinforcing member 4 and the auxiliary reinforcing member 43 are locked onto the lower housing frame 1 using blind rivets. By placing the auxiliary reinforcing member 43 at the top, it is convenient to operate and install it. When the auxiliary reinforcing member 43 is placed on the side, the blind rivets may interfere with the side wall of the lower housing frame 1. This structure helps to simplify the assembly process and improve maintenance efficiency.

[0029] Optionally, a short crossbeam 21 is provided inside the lower box frame 1, and the short crossbeam 21 is perpendicular to the longitudinal beam 3.

[0030] Exemplary, in embodiments of this utility model, such as Figure 1 and Figure 2 As shown, by setting the short crossbeam 21, the internal space of the lower housing frame 1 can be divided into multiple areas. The middle area is used to install battery cells, and the two end areas are used to install electronic control equipment such as BDU or BMS. Setting the short crossbeam 21 not only improves the structural strength of this battery pack structure, but also divides the space inside the lower housing frame 1 into different functional areas, which facilitates the installation of electronic control equipment later.

[0031] Optionally, a T-shaped sheet metal reinforcing plate 44 is provided between the short crossbeam 21 and the longitudinal beam 3, and the T-shaped sheet metal reinforcing plate 44 is located on the top surface of the short crossbeam 21 and the longitudinal beam 3.

[0032] Exemplary, in embodiments of this utility model, such as Figure 6 As shown, the T-shaped sheet metal reinforcing plate 44 is also installed on the top surface of the short crossbeam 21 and the longitudinal beam 3 via blind rivets. By setting the T-shaped sheet metal reinforcing plate 44, the connection strength between the short crossbeam 21 and the longitudinal beam 3 can be improved, further enhancing the structural strength of this battery pack structure. The T-shaped sheet metal reinforcing plate 44 is located on the top surface of the short crossbeam 21 and the longitudinal beam 3, facilitating its installation and fixation, simplifying the assembly process, and improving maintenance efficiency.

[0033] Optionally, a liquid cooling plate 5 is provided at the bottom of the lower housing frame 1, and a limiting strip 51 is provided on the liquid cooling plate 5, which is arranged along the length of the longitudinal beam 3.

[0034] Exemplary, in embodiments of this utility model, such as Figure 1As shown, the lower housing frame 1 and the liquid cooling plate 5 are connected by friction stir welding. For other areas where friction stir welding is insufficient, argon arc welding is used. For mounting brackets and airtight repairs, tungsten inert gas welding or laser welding is used. A liquid cooling plate 5 is located at the bottom of the lower housing frame 1, and thermally conductive structural adhesive 6 is applied to it. The battery cell is mounted on the liquid cooling plate 5 via the thermally conductive structural adhesive 6. Limiting adhesive strips 51 are also provided on the liquid cooling plate 5 to provide bottom support for the battery cell. Two limiting adhesive strips 51 are spaced apart below the battery cell, providing more stable bottom support and allowing the bottom of the battery cell to remain suspended. This prevents the thermally conductive structural adhesive 6 from being compressed due to the battery cell's own weight, reducing the thermal interface between the bottom of the battery cell and the liquid cooling plate 5. By setting the limiting adhesive strips 51, the thermally conductive structural adhesive 6 is stably maintained between the bottom of the battery cell and the liquid cooling plate 5, thereby improving the heat dissipation performance of the battery cell. Bottom of the liquid cooling plate are arranged in sequence: bottom protective plate support foam 7, bottom protective plate sealing foam 8, and bottom protective plate 9, which are used to protect the bottom structure of the battery pack.

[0035] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A CTP battery pack structure, characterized by, include: The lower box frame (1), crossbeams (2), longitudinal beams (3), and reinforcing members (4) are all included. The crossbeam (2) and the longitudinal beam (3) are arranged inside the lower box frame (1). The crossbeam (2) is perpendicular to the longitudinal beam (3). The reinforcing member (4) is arranged between the crossbeam (2) and the lower box frame (1). The reinforcing member (4) is arranged between the longitudinal beam (3) and the lower box frame (1).

2. The CTP battery pack structure of claim 1, wherein, The reinforcing member (4) is detachably connected to the crossbeam (2), the longitudinal beam (3), and the lower box frame (1).

3. The CTP battery pack structure of claim 1, wherein, The reinforcing member (4) includes an L-shaped sheet metal reinforcing piece (41) and an embedded sheet metal reinforcing block (42). The longitudinal beam (3) is connected to the lower box frame (1) through the L-shaped sheet metal reinforcing piece (41). One side of the L-shaped sheet metal reinforcing piece (41) is connected to the top surface of the longitudinal beam (3), and the other side is connected to the inner wall of the lower box frame (1). The crossbeam (2) is connected to the lower box frame (1) through the embedded sheet metal reinforcing block (42). A reinforcing sleeve (421) is provided on one side of the embedded sheet metal reinforcing block (42). The crossbeam (2) is inserted into the reinforcing sleeve (421), and the other side of the embedded sheet metal reinforcing block (42) is connected to the inner wall of the lower box frame (1).

4. The CTP battery pack structure of claim 1, wherein, An auxiliary reinforcing member (43) is provided between the crossbeam (2) and the longitudinal beam (3).

5. The CTP battery pack structure of claim 4, wherein, The auxiliary reinforcing member (43) is located on the top surface of the crossbeam (2) and the longitudinal beam (3), and the auxiliary reinforcing member (43) is cross-shaped.

6. The CTP battery pack structure according to claim 1, characterized in that, The lower box frame (1) is provided with a short crossbeam (21), which is perpendicular to the longitudinal beam (3).

7. The CTP battery pack structure of claim 6, wherein, A T-shaped sheet metal reinforcing plate (44) is provided between the short crossbeam (21) and the longitudinal beam (3), and the T-shaped sheet metal reinforcing plate (44) is located on the top surface of the short crossbeam (21) and the longitudinal beam (3).

8. The CTP battery pack structure of claim 1, wherein, The bottom of the lower box frame (1) is provided with a liquid cooling plate (5), and a limiting strip (51) is provided on the liquid cooling plate (5). The limiting strip (51) is arranged along the length direction of the longitudinal beam (3).

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