Battery pack case and battery pack

Abstract

The utility model discloses a battery package box body, include: box main part is used to accommodate battery module, inner frame is embedded in the box main part, include: stringer, along the length direction of box main part relative setting, with the side wall inner surface of box main part is attached, heighten beam, along the height direction of box main part from the top end of stringer upward extension, a plurality of lugs are used for the connection fixed of battery package box body, the lug is installed in the side wall outer surface of box main part and with stringer and heighten beam fixed connection. The battery package box body has improved the bearing stress distribution of box body, effectively promoted the structural rigid strength performance of box body, also can not make obvious increase box body weight, satisfies the lightweight design demand, and simultaneously has no influence to the energy density performance of battery package. The utility model discloses a battery package.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a battery pack housing and a battery pack. Background Technology

[0002] The main components of an automotive power battery pack are the housing, battery modules, thermal management system, and electrical components. The housing is composed of the main body, inner frame, lifting lugs, bolts, and fasteners. The housing provides a stable and reliable space for the battery modules, electrical components, and thermal management system, as well as safety protection.

[0003] Due to the large mass of the modules, the depth of the enclosure, and the low center of gravity of the battery pack, coupled with the high mounting points of the lifting lugs to the vehicle body, a long lever arm is generated. When the vehicle travels on bumpy roads, this results in significant tension between the lifting lugs and the main body of the enclosure, leading to insufficient enclosure strength and excessive stress. Current conventional methods include increasing the thickness of the inner frame or raising its mounting position within the enclosure. However, limitations imposed by the module's installation dimensions and the internal structural layout make it difficult to change the mounting height of the inner frame, and any alteration would involve changes to other related structures, creating a domino effect. Simply changing the inner frame thickness does not significantly improve enclosure strength, and typically, the thickness of the main body is also increased to enhance overall enclosure strength. While this method is effective, it significantly increases the enclosure's mass, raising production costs and failing to meet lightweight design requirements, ultimately reducing the battery pack's energy density.

[0004] Therefore, designing an internal frame structure with good mechanical properties, strong load-bearing capacity, light weight, and manufacturing feasibility under limited enclosure design space is a major challenge in battery pack design. Utility Model Content

[0005] To solve the above-mentioned technical problems, an embodiment of this utility model discloses a battery pack housing, comprising:

[0006] The main body of the box is used to house the battery and / or the battery module;

[0007] The inner frame, fitted inside the main body of the box, includes:

[0008] The longitudinal beams are arranged opposite each other along the length of the main body of the box and fit against the inner surface of the side wall of the main body of the box;

[0009] The heightening beam extends upward from the top of the longitudinal beam along the height direction of the box body;

[0010] Multiple lifting lugs are used for connecting and fixing the battery pack housing. The lifting lugs are installed on the outer surface of the side wall of the housing body and are fixedly connected to the longitudinal beam and the heightening beam.

[0011] By adopting the above technical solution, stress distribution can be improved by increasing the height of the beams without changing the module installation size and the core layout inside the box. At the same time, the connection strength between the longitudinal beams and the lifting lugs can be strengthened, and the connection reliability between the lifting lugs and the box can be enhanced. This achieves a balance between lightweight box and improved mechanical performance, while also avoiding space encroachment and ensuring battery capacity.

[0012] Optionally, the height of the heightening beam is 20-40mm.

[0013] Optionally, the heightening beam is provided with a plurality of notches spaced apart, the notches being recessed from the top of the heightening beam toward the longitudinal beam, and the notches being arranged adjacent to the lifting lugs.

[0014] Optionally, the height of the notch is 20-30mm.

[0015] Optionally, the main body of the box includes a front box and a rear box, the inner frame includes a front box inner frame and a rear box inner frame, the front box inner frame includes a front box longitudinal beam and a front box extension beam, the rear box inner frame includes a rear box longitudinal beam and a rear box extension beam, wherein the length of the notch on the front box extension beam is 45-60mm, and / or the length of the notch on the rear box extension beam is 80-130mm.

[0016] Optionally, the front box inner frame further includes a front box front crossbeam and a front box rear crossbeam arranged opposite each other along the width direction of the box body, the rear box inner frame further includes a rear box front crossbeam and a rear box rear crossbeam arranged opposite each other along the width direction, the front box longitudinal beam includes a front box left longitudinal beam and a front box right longitudinal beam arranged opposite each other along the length direction, the rear box longitudinal beam includes a rear box left longitudinal beam and a rear box right longitudinal beam arranged opposite each other along the length direction, and the front box rear crossbeam and the rear box front crossbeam are fixedly connected through the front box and the rear box.

[0017] Optionally, the front box rear crossbeam is provided with a notch, the notch is recessed downward from the edge of the front box rear crossbeam along the height direction, and the length of the notch is 550-580mm.

[0018] Optionally, the lifting lugs, the main body of the box, and the inner frame are welded and fixed.

[0019] Optionally, the inner frame is integrally formed, and / or the box body is integrally formed.

[0020] The present invention also discloses a battery pack, including at least one battery, and / or at least one battery module, which further includes the battery pack housing as described above.

[0021] By adopting the above technical solution, stress distribution can be improved by increasing the height of the beams without changing the module installation size and the core layout inside the box. At the same time, the connection strength between the longitudinal beams and the lifting lugs can be strengthened, and the connection reliability between the lifting lugs and the box can be enhanced. This achieves a balance between lightweight box and improved mechanical performance, while also avoiding space encroachment and ensuring cell capacity. Attached Figure Description

[0022] Figure 1 A schematic diagram of the inner frame structure of one embodiment of the present invention is shown;

[0023] Figure 2 This diagram shows a schematic of the battery pack housing structure according to one embodiment of the present invention.

[0024] Figure 3 A schematic diagram of the inner frame structure of another embodiment of the present invention is shown;

[0025] Figure 4 This diagram shows the structure of the inner frame and the main body of the box after assembly, according to another embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Battery pack housing, 2. Housing body, 3. Inner frame, 4. Lifting lug, 5. Longitudinal beam, 6. Reinforcement beam, 7. Notch, 8. Side wall, 9. Front box, 10. Rear box, 11. Front box inner frame, 12. Rear box inner frame, 13. Front box longitudinal beam, 14. Front box reinforcement beam, 15. Rear box longitudinal beam, 16. Rear box reinforcement beam, 17. Front box front crossbeam, 18. Front box rear crossbeam, 19. Rear box front crossbeam, 20. Rear box rear crossbeam, 21. Front box left longitudinal beam, 22. Front box right longitudinal beam, 23. Rear box left longitudinal beam, 24. Rear box right longitudinal beam, 25. Notch. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0029] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0031] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0032] 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.

[0033] Combination Figure 1 and Figure 2 The first aspect of this utility model discloses a battery pack housing 1, which includes a main body 2, an inner frame 3, and multiple lifting lugs 4. The main body 2 is used to house batteries (not shown in the figure) and / or battery modules (not shown in the figure); the inner frame 3 is embedded inside the main body 2 and can conform to the inner surface of the main body 2; the lifting lugs 4 are installed on the outer wall of the main body 2 for connecting and fixing the battery pack housing 1, and the battery pack is installed in the vehicle body using the lifting lugs 4.

[0034] Furthermore, inner frame 3 includes:

[0035] Longitudinal beam 5, along the length of box body 2 (e.g.) Figure 2 and Figure 4 As shown in direction A), it is positioned opposite to the inner surface of the side wall 8 of the main body 2;

[0036] Increase the height of beam 6, along the height direction of the main body 2 of the box (e.g.) Figure 2 and Figure 4 As shown in direction B), it extends upward from the top of the longitudinal beam 5 and also fits against the inner surface of the side wall 8 of the box body 2.

[0037] Specifically, the lifting lugs 4 are installed on the outer surface of the side wall 8 of the main body 2 and are fixedly connected to the longitudinal beam 5 and the heightening beam 6. More specifically, multiple lifting lugs 4 are arranged at intervals on the outer surface of the side wall 8.

[0038] Specifically, the total height of the longitudinal beam 5 and the heightening beam 6 does not exceed the height of the side wall 8 in the main body 2. That is, in this utility model, under certain space constraints, the longitudinal beam 5 is extended in the height direction by the heightening beam 6. Without affecting the module installation and the internal space layout of the battery pack housing 1, the heightening beam 6 improves the load-bearing stress distribution of the battery pack housing 1, solves the stress concentration problem, and effectively improves the structural stiffness and strength of the battery pack housing 1. It has been verified that the Y-axis (transverse to the vehicle, perpendicular to the vehicle's forward direction) mode of the battery pack is also improved by about 3Hz, ensuring sufficient mechanical performance requirements, providing a reliable fixing structure for the heavier modules, and adapting to complex and variable load conditions. Furthermore, there is no need to increase the strength by thickening the inner frame 3 or the main body 2; the load-bearing capacity can be strengthened simply by the heightening beam 6. While ensuring the mechanical performance of the battery pack housing 1, it avoids a significant increase in weight, meets the requirements of lightweight design, and does not compress the battery module space due to increased thickness, thus ensuring the energy density of the battery pack. The lifting lug 4 is fixedly connected to both the longitudinal beam 5 and the heightening beam 6, enabling multi-point fixing and allowing the force to be transmitted more evenly to the entire inner frame 3, thus avoiding localized stress concentration.

[0039] In a specific embodiment of this utility model, the connection between the heightened beam 6 and the longitudinal beam 5 has a rounded corner transition.

[0040] In a specific embodiment of this utility model, the height of the reinforcing beam 6 is 20-40mm. Within this range, the weight can be controlled while fully improving strength, meeting the requirements for lightweighting, and adapting to the limited space within the main body 2. Preferably, the height of the reinforcing beam 6 is 25-30mm, which can further balance mechanical properties and lightweight requirements.

[0041] Furthermore, the total height of the longitudinal beam 5 and the heightened beam 6 is 120-130mm, for example, 124.5mm.

[0042] In the embodiments of this utility model, reference continues to be made. Figure 1 and Figure 2 The raised beam 6 has multiple notches 7 spaced apart, with the notches 7 recessed from the top of the raised beam 6 toward the longitudinal beam 5, and the notches 7 are arranged adjacent to the lifting lugs 4. That is, there can be one notch 7 between two adjacent lifting lugs 4. On the one hand, the notches 7 can help save materials; on the other hand, they can reserve assembly and operation space around the lifting lugs 4, facilitating positioning, bolt tightening, and other processes during the installation of the lifting lugs 4. At the same time, they can disperse stress to avoid local stress concentration at the connection between the raised beam 6 and the lifting lugs 4, further improving the overall fatigue resistance of the structure.

[0043] In a specific embodiment of this utility model, the height of the notch 7 is 20-30mm, which can further save materials and improve the lightweight effect while ensuring strength.

[0044] In the specific embodiments of this utility model, further reference is made to Figure 3 and Figure 4 The main body 2 includes a front box 9 and a rear box 10. The inner frame 3 includes a front box inner frame 11 and a rear box inner frame 12. The front box inner frame 11 includes a front box longitudinal beam and a front box heightening beam. The rear box inner frame 12 includes a rear box longitudinal beam and a rear box heightening beam. Both the front box 9 and the rear box 10 are provided with longitudinal beams arranged opposite each other along the length direction, and are also provided with heightening beams accordingly.

[0045] Specifically, in combination Figure 3 and Figure 4 The length of the notch 7 on the front box lifting beam 14 is 45-60mm. For example, each of the two oppositely arranged front box lifting beams 14 has a corresponding notch 7 with a length of 55mm. This not only ensures that the notch 7 saves materials and reserves assembly space, but also avoids the front box lifting beam 14 itself being too strong due to the notch 7 being too long. At the same time, the corresponding notch 7 can make the force on both sides of the front box more balanced, further optimizing the overall structural stability.

[0046] Specifically, refer to Figure 3 and Figure 4 The length of the notch on the rear box lifting beam 16 is 80-130mm. For example, two opposite rear box lifting beams 16 are provided with two notches 7. The widths of the two notches on each rear box lifting beam 16 are 120mm and 85mm, respectively. This not only saves materials by using longer notches to adapt to the more complex assembly requirements of the rear box 10, but also ensures the strength of the rear box lifting beam 16 itself while making the force on both sides of the rear box 10 more even, adapting to the structural characteristics and usage scenarios of the rear box 10.

[0047] In a specific embodiment of this utility model, such as Figure 3 and Figure 4 As shown, and refer to Figure 2 The front box inner frame 11 also includes a section along the width direction of the box body 2 (e.g., Figure 2 and Figure 4The front box front crossbeam 17 and front box rear crossbeam 18 are arranged opposite each other in the direction C shown. The rear box inner frame 12 also includes the rear box front crossbeam 19 and rear box rear crossbeam 20 arranged opposite each other in the width direction. The front box longitudinal beam 13 includes the front box left longitudinal beam 21 and front box right longitudinal beam 22 arranged opposite each other in the length direction. The rear box longitudinal beam 15 includes the rear box left longitudinal beam 23 and rear box right longitudinal beam 24 arranged opposite each other in the length direction. That is, the two ends of the front box left longitudinal beam 21 and the front box right longitudinal beam 22 are connected by the front box front crossbeam 17 and the front box rear crossbeam 18, respectively. The two ends of the rear box left longitudinal beam 23 and the rear box right longitudinal beam 24 are connected by the rear box front crossbeam 19 and the rear box rear crossbeam 20, respectively. Each longitudinal beam is provided with a corresponding heightening beam. Specifically, the front box rear crossbeam 18 and the rear box front crossbeam 19 are fixedly connected through the front box 9 and the rear box 10. That is, the front box rear crossbeam 18 is fixedly connected to the front box 9, and the rear box front crossbeam 19 is fixedly connected to the rear box 10, thus the front box rear crossbeam 18 and the rear box front crossbeam 19 are fixedly connected together. Specifically, the front box rear crossbeam 18 is welded to the front box 9 by resistance welding, and the rear box front crossbeam 19 is welded to the rear box 10 by resistance welding. By constructing a grid-like three-dimensional support structure, the overall rigidity of the front and rear boxes is greatly improved, the continuity and torsional resistance of the entire battery pack housing 1 are strengthened, and structural weak points are avoided at the connection between the front and rear boxes due to stress discontinuity, further ensuring the stability of the battery pack housing 1 under complex working conditions.

[0048] In a specific embodiment of this utility model, such as Figure 3 As shown, the front box rear crossbeam 18 has a notch 25. The notch 25 is recessed downward from the edge of the front box rear crossbeam 18 along the height direction. Without weakening the overall support strength of the front box rear crossbeam 18, it provides space for other components inside the box to avoid interference during component installation. At the same time, the notch 25 can also optimize the stress distribution of the front box rear crossbeam 18 and reduce the stress concentration at the connection between it and the rear box front crossbeam 19, making the connection between the two crossbeams more stable.

[0049] In a specific embodiment of this utility model, the length of the notch 25 is 550-580mm, for example, 560mm, to achieve a balance between space avoidance and structural stability.

[0050] In a specific embodiment of this utility model, the lifting lug 4, the main body 2, and the inner frame 3 are all welded and fixed. Specifically, they are connected and assembled by MIG welding and resistance welding.

[0051] In a specific embodiment of this utility model, the inner frame 3 is integrally formed, meaning that all parts of the inner frame 3 are integrally formed. Furthermore, the box body 2 is integrally formed. Production can be achieved through simple mold modification, ensuring structural strength without increasing manufacturing processes, manufacturing difficulty, or cost.

[0052] The second aspect of this utility model discloses a battery pack, including at least one battery and / or at least one battery module, which also includes the battery pack housing of the above embodiments. It can enhance vibration resistance and reduce stress concentration through the combination of longitudinal beams and heightened beams, and control weight while ensuring the installation space and energy density of the battery module. Ultimately, it achieves a synergistic improvement in mechanical reliability, lightweighting and energy efficiency, and adapts to the complex driving conditions of vehicles.

[0053] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A battery pack housing, characterized in that, include: The main body of the box is used to house the battery and / or the battery module; The inner frame, fitted inside the main body of the box, includes: The longitudinal beams are arranged opposite each other along the length of the main body of the box and fit against the inner surface of the side wall of the main body of the box; The heightening beam extends upward from the top of the longitudinal beam along the height direction of the box body; Multiple lifting lugs are used for connecting and fixing the battery pack housing. The lifting lugs are installed on the outer surface of the side wall of the housing body and are fixedly connected to the longitudinal beam and the heightening beam.

2. The battery pack housing as described in claim 1, characterized in that, The height of the heightened beam is 20-40mm.

3. The battery pack housing as described in claim 1, characterized in that, The heightened beam has multiple notches spaced apart, which are recessed from the top of the heightened beam toward the longitudinal beam, and are arranged adjacent to the lifting lug.

4. The battery pack housing as described in claim 3, characterized in that, The height of the notch is 20-30mm.

5. The battery pack housing as described in claim 3, characterized in that, The main body of the box includes a front box and a rear box. The inner frame includes a front box inner frame and a rear box inner frame. The front box inner frame includes a front box longitudinal beam and a front box extension beam. The rear box inner frame includes a rear box longitudinal beam and a rear box extension beam. The length of the notch on the front box extension beam is 45-60mm, and the length of the notch on the rear box extension beam is 80-130mm.

6. The battery pack housing as described in claim 5, characterized in that, The front box inner frame also includes a front box front crossbeam and a front box rear crossbeam arranged opposite each other along the width direction of the box body. The rear box inner frame also includes a rear box front crossbeam and a rear box rear crossbeam arranged opposite each other along the width direction. The front box longitudinal beams include a front box left longitudinal beam and a front box right longitudinal beam arranged opposite each other along the length direction. The rear box longitudinal beams include a rear box left longitudinal beam and a rear box right longitudinal beam arranged opposite each other along the length direction. The front box rear crossbeam and the rear box front crossbeam are fixedly connected through the front box and the rear box.

7. The battery pack housing as described in claim 6, characterized in that, The front box rear crossbeam has a notch, which is recessed downward from the edge of the front box rear crossbeam along the height direction, and the length of the notch is 550-580mm.

8. The battery pack housing as described in claim 1, characterized in that, The lifting lugs, the main body of the box, and the inner frame are welded and fixed.

9. The battery pack housing as described in claim 1, characterized in that, The inner frame is integrally formed, and / or the main body of the box is integrally formed.

10. A battery pack comprising at least one battery, and / or at least one battery module, characterized in that, Includes the battery pack housing as described in any one of claims 1-9.

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