A BMS fixed support and a battery pack

Abstract

The utility model provides a kind of BMS fixed support, the BMS fixed support includes: frame, by the frame of multiple sections head-to-tail is enclosed, with the opposite front and back along thickness direction, front and back are perpendicular with the top surface of frame respectively, front is in abutment with BMS, back is in abutment with the side wall of expansion beam, top surface is equipped with multiple installation holes distributed along first direction, BMS fixed support is riveted with BMS by installation hole;Ear, including multiple, along first direction distribution, from the top surface of frame along height direction, connection hole is set up on ear, BMS fixed support is riveted with expansion beam by connection hole.The above technical scheme can effectively solve the problem of size deviation caused by process limitation of traditional support, and ensure that the BMS fixed support has good anti-deformation, anti-vibration structural strength.The utility model also provides a kind of battery pack comprising the above-mentioned BMS fixed support.

Description

Technical Field

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

[0002] Currently, CTP (Cell to Pack) and CTB (Cell to Body) on-board power battery integration solutions are becoming increasingly widely used in the market. While these solutions can optimize battery pack performance by compressing space and improving volume utilization, they also place higher demands on BMS (Battery Management System) modules and BMS integration technology. In centralized layout solutions, the mainstream technology currently on the market mostly uses fixed brackets made of sheet metal stamping or sheet metal bending processes to fix the BMS. This method has obvious drawbacks: On the one hand, sheet metal stamping and bending processes are limited by their own characteristics. The design must take into account parameters such as draft angle and stamping depth, resulting in a larger overall size of the fixed bracket, which occupies the already tight space in the battery pack, contradicting the core requirement of "compact integration" in CTP and CTB. On the other hand, the basic structural strength of the sheet metal body is limited, and its strength will be further weakened after stamping. This makes it prone to deformation during assembly. When the vehicle is driven on complex road surfaces for a long time, the bracket will also suffer fatigue and durability failure due to continuous vibration. Its strength cannot withstand the stress brought by long-term road conditions, resulting in cracking. This structural failure will directly transfer the stress to the BMS sampling unit, causing inaccurate or invalid BMS sampling data. In severe cases, it may even lead to vehicle power system failure, posing a direct threat to driving safety. Utility Model Content

[0003] The present invention provides the following technical solutions to solve the above-mentioned technical problems.

[0004] This utility model provides a BMS mounting bracket for fixing a BMS to a battery pack. The battery pack includes a lower housing, multiple battery cells, and an expansion beam. The expansion beam is fixed to the lower housing and located between the battery cells and the side wall of the lower housing. The BMS mounting bracket includes:

[0005] The frame is composed of multiple connected side frames and has a front and a back side facing each other along the thickness direction. The front and the back side are perpendicular to the top surface of the frame. The front side abuts against the BMS, and the back side abuts against the side wall of the expansion beam. The top surface is provided with multiple mounting holes distributed along a first direction. The BMS fixing bracket is riveted to the BMS through the mounting holes. The first direction is perpendicular to both the thickness direction and the height direction.

[0006] The ear portion, including multiple portions, is distributed along the first direction and extends from the top surface of the frame along the height direction. The ear portion is provided with a connection hole, and the BMS fixing bracket is riveted to the expansion beam through the connection hole.

[0007] By adopting the above technical solution, the problem of excessive size caused by process limitations of traditional BMS fixing brackets can be effectively solved, while ensuring that the BMS fixing brackets have good structural strength in terms of deformation resistance and vibration resistance.

[0008] According to another specific embodiment of the present invention, the mounting hole includes a first mounting hole and a second mounting hole, and the frame body is provided with a plurality of weight-reducing grooves. The plurality of weight-reducing grooves pass through the BMS fixing bracket along the thickness direction. The plurality of weight-reducing grooves include a first weight-reducing groove. The bottom surface of the first weight-reducing groove is provided with a riveting hole. The BMS fixing bracket is also riveted to the BMS through the riveting hole. The riveting hole is located between the first mounting hole and the second mounting hole along the first direction.

[0009] According to another specific embodiment of this utility model, the riveting hole is an oblong hole.

[0010] According to another specific embodiment of the present invention, a notch is provided on the top surface of the frame near the expansion beam, and the notch is connected to the first weight-reducing groove to form a heat dissipation channel.

[0011] According to another specific embodiment of the present invention, the plurality of weight-reducing grooves further include a second weight-reducing groove, which is located below the first weight-reducing groove and adjacent to the first weight-reducing groove.

[0012] According to another specific embodiment of the present invention, the top surface of the frame has a convex structure, having a highest convex part and two lower parts that are recessed relative to the highest convex part, and the two lower parts are symmetrically distributed about the highest convex part. The ear is disposed on the highest convex part, and the mounting hole includes a first mounting hole and a second mounting hole, the first mounting hole and the second mounting hole being disposed on the two lower parts respectively.

[0013] According to another specific embodiment of the present invention, a limiting plate perpendicular to the top surface is also provided on the top surface. The plane on which the limiting plate is located is coplanar with the opposite side of the BMS fixing bracket. The limiting plate is used to abut against the BMS during assembly to limit its contact with the expansion beam.

[0014] According to another specific embodiment of the present invention, the frame is formed by a top frame, a side frame, and a bottom frame, and is symmetrical about a central axis extending along the height direction. The top surface is the plane where the top frame is located. The bottom frame includes a first bottom frame perpendicular to the height direction and two second bottom frames respectively connected to the two ends of the first bottom frame and extending outward at an angle and connected to the side frame. The angles between the second bottom frames and the first bottom frame and the side frame are all obtuse angles.

[0015] This utility model also provides a battery pack, including the BMS fixing bracket in any of the above embodiments.

[0016] By adopting the above technical solution, thanks to the excellent structural strength of the BMS mounting bracket, it can stably support and fix the BMS for a long time, effectively resisting the vibration, impact and stress inside the battery pack during vehicle operation, and ultimately significantly improving the continuity and accuracy of battery pack data transmission, and enhancing overall operational stability.

[0017] According to another specific embodiment of the present invention, the mounting hole includes a first mounting hole and a second mounting hole. The frame body is provided with a plurality of weight-reducing grooves, which penetrate the BMS fixing bracket along the thickness direction. The plurality of weight-reducing grooves include a first weight-reducing groove, and a riveting hole is provided on the bottom surface of the first weight-reducing groove. The BMS fixing bracket is also riveted to the BMS through the riveting hole. The riveting hole is located between the first mounting hole and the second mounting hole along the first direction. The battery pack further includes:

[0018] Lower housing;

[0019] Multiple battery cells;

[0020] An expansion beam is fixed to the lower housing and located between the battery cell and the side wall of the lower housing. The bottom of the expansion beam facing the BMS mounting bracket has a first guide portion. The bottom of the BMS mounting bracket has a second guide portion adapted to the first guide portion. The expansion beam has a tongue extending outward along its thickness direction. The riveting hole is arranged opposite to the tongue along the height direction. The BMS, the BMS mounting bracket, and the expansion beam are riveted together as a single structure through the riveting hole and the tongue. Attached Figure Description

[0021] Figure 1 This diagram illustrates a three-dimensional structure of the expansion beam, BMS fixing bracket, and BMS assembly in one embodiment of the present invention. Figure 1 ;

[0022] Figure 2 Show Figure 1 A magnified view of a portion of point A in the middle;

[0023] Figure 3 This diagram illustrates a three-dimensional structure of the expansion beam, BMS fixing bracket, and BMS assembly in one embodiment of the present invention. Figure 2 ;

[0024] Figure 4 This is a front view of the expansion beam, BMS fixing bracket, and BMS after assembly in one embodiment of the present invention;

[0025] Figure 5 This shows a side view of the expansion beam, BMS fixing bracket, and BMS after assembly in one embodiment of the present invention;

[0026] Figure 6 A top view of the expansion beam in a specific embodiment of this utility model is shown;

[0027] Figure 7 A side view of the expansion beam in a specific embodiment of this utility model is shown;

[0028] Figure 8 This diagram illustrates the three-dimensional structure of the BMS fixing bracket in a specific embodiment of the present invention. Figure 1 ;

[0029] Figure 9 This diagram illustrates the three-dimensional structure of the BMS fixing bracket in a specific embodiment of the present invention. Figure 2 ;

[0030] Figure 10 This shows a front view of the BMS fixing bracket and the assembled BMS in one embodiment of the present invention;

[0031] Figure 11 This shows a top view of the BMS fixing bracket and the assembled BMS in one embodiment of the present invention;

[0032] Figure 12 This shows a top view of the BMS fixing bracket and the assembled BMS in one embodiment of the present invention;

[0033] Figure 13 This diagram shows a three-dimensional structure of the BMS fixing bracket and the assembled BMS in one embodiment of the present invention.

[0034] Symbol explanation:

[0035] 1-BMS fixing bracket, 2-expansion beam, 3-frame, 3.1 top frame, 3.2 side frame, 3.3 bottom frame, 3.3.1 first bottom frame, 3.3.2 second bottom frame, 14-first guide part, 15-second guide part, 4-front, 5-back, 6-top surface, 6.1 highest protrusion, 6.2 low part, 7-BMS, 8-mounting hole, 8.1 first mounting hole, 8.2 second mounting hole, 9-ear, 10-connecting hole, 11-weight reduction groove, 11.1 first weight reduction groove, 11.2 second weight reduction groove, 12-riveting hole, 13-notch, 14-first guide part, 15-second guide part, 16-riveting piece, 17-reinforcing plate, 18-nut sleeve. Detailed Implementation

[0036] 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, unless otherwise specified, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0037] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0038] 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.

[0039] 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.

[0040] The battery pack includes a lower housing, multiple battery cells, and an expansion beam. The expansion beam is fixed to the lower housing and located between the battery cells and the side walls of the lower housing. Its core function is to act as a force-transmitting structure, buffering and absorbing the expansion force generated by the battery cells through its own deformation to adapt to the dynamic changes in the expansion and contraction of the battery cells, while directly bearing and dispersing the expansion stress. Typically, the expansion beam consists of two beams arranged opposite each other along the length or width of the battery module (composed of multiple battery cells), mainly used to clamp the battery module. When a battery cell expands, the expansion beam can deform appropriately to adapt to the expansion and contraction, thereby reducing the stress on the lower housing and ultimately achieving a buffering protection effect. To effectively solve the problems of excessively large spatial dimensions and weak structural strength in existing BMS fixing brackets, this utility model provides the following technical solution for the above battery pack structure.

[0041] Reference Figures 8-13 This utility model provides a BMS mounting bracket 1 for fixing a BMS 7 to a battery pack. The BMS mounting bracket 1 includes:

[0042] Frame 3 is composed of multiple connected border segments, and it has a thickness direction (e.g., Figure 5 (in the Y direction) relative to the front 4 (refer to) Figure 8 ) and back 5 (refer to) Figure 12 The front (4) and back (5) are respectively connected to the top surface (6) of the frame (3) (see reference). Figure 9 Vertical. Front 4 abuts against BMS 7, back 5 abuts against the side wall of expansion beam 2. Top surface 6 has multiple protrusions along the first direction (e.g., Figure 4 , Figure 10 and Figure 13 Mounting holes 8 distributed in the X direction (refer to) Figure 8 The BMS mounting bracket 1 is riveted to the BMS 7 through mounting holes 8. The first direction X is perpendicular to the thickness direction Y and... Figure 5 , Figure 10 and Figure 13 The height direction Z is shown in the figure.

[0043] Multiple ear-shaped parts 9 are distributed along the first direction X and extend from the top surface 6 of the frame 3 along the height direction Z. Each ear-shaped part 9 has a connecting hole 10, through which the BMS fixing bracket 1 is riveted to the expansion beam 2. During assembly, the front side 4 of the BMS fixing bracket 1 is riveted to the BMS 7 through the mounting hole 8 on the top surface 6, while the back side 5 is riveted to the expansion beam 2 via the connecting holes 10 of the ear-shaped parts 9. The final stable assembly structure can be referred to [reference needed]. Figure 1 -Figure 5.

[0044] It should be noted that the BMS fixing bracket 1 provided by this utility model is manufactured using die casting technology, rather than traditional sheet metal stamping or bending. Die casting allows for precise forming using molds, eliminating the need for draft angles in subsequent processing as required by sheet metal work. This reduces unnecessary dimensional redundancy from the design stage, effectively solving the problem of excessively large dimensions caused by process limitations in traditional brackets. Furthermore, by directly integrating the BMS fixing bracket 1 onto the side wall of the expansion beam 2, this utility model leverages the inherent characteristics of the expansion beam 2 to create a synergistic, integrated structure that ensures the BMS fixing bracket 1 has good overall structural strength against deformation and vibration. It also eliminates the need for a separate fixing base and support structure required by traditional brackets, further reducing space requirements and ultimately achieving a dual optimization effect of "reduced size" and "enhanced strength."

[0045] Furthermore, referring to Figure 6 and Figure 8 In the above embodiment, the mounting hole 8 includes a first mounting hole 8.1 and a second mounting hole 8.2. The frame 3 has multiple weight-reducing grooves 11, which extend along the thickness direction Y through the BMS fixing bracket 1. The multiple weight-reducing grooves 11 include a first weight-reducing groove 11.1. A riveting hole 12 is provided on the bottom surface of the first weight-reducing groove 11.1. The BMS fixing bracket 1 is also riveted to the BMS 7 through the riveting hole 12. The riveting hole 12 is located between the first mounting hole 8.1 and the second mounting hole 8.2 along the first direction X. The final structural form after the BMS 7 and the BMS fixing bracket 1 are riveted together through the first mounting hole 8.1, the second mounting hole 8.2, and the riveting hole 12 is as follows: Figure 10 As shown.

[0046] Using the above technical solution, during the installation of BMS 7 onto the BMS mounting bracket 1, preliminary riveting and positioning can be completed first through the riveting hole 12. Then, based on actual assembly requirements, the alignment accuracy of the first mounting hole 8.1 and the second mounting hole 8.2 can be fine-tuned to complete the final riveting. This assembly method of "preliminary positioning followed by precise fine-tuning" forms a three-point positioning structure of the first mounting hole 8.1, the second mounting hole 8.2, and the riveting hole 12, significantly improving the stability of the connection between BMS 7 and the BMS mounting bracket 1, avoiding assembly loosening problems caused by vibration during subsequent use. At the same time, the design of the weight-reducing groove 11 can also reduce the overall weight of the bracket while ensuring structural strength.

[0047] Furthermore, in the above embodiments, reference is made to Figure 10 and Figure 12To further improve the reliability of riveting, a reinforcing plate 17 can be added to the outside of the riveting part 16. The reinforcing plate 17 can distribute the local stress at the riveting point to avoid deformation or cracking of the riveting point due to vibration during long-term use. In addition, nut sleeves 18 can be set below the first mounting hole 8.1 and the second mounting hole 8.2, and at the bottom of the top surface 6, to facilitate the subsequent riveting process to achieve a stable connection between the BMS 7 and the BMS support bracket 1.

[0048] Furthermore, referring to Figure 6 , Figures 8-9 as well as Figure 11 In the above embodiment, the rivet hole 12 is an oblong hole.

[0049] Compared to circular holes, oblong holes have a certain length margin along the first direction X, providing a small amount of movement space. During assembly, even if there is a slight deviation in the initial alignment of BMS 7 and BMS mounting bracket 1, the position of the riveting point can be adjusted through the movement margin of the oblong hole, without the need to disassemble and adjust the overall structure again. After the riveting hole 12 has completed the initial positioning, when fine-tuning the first mounting hole 8.1 and the second mounting hole 8.2, the oblong hole can also adapt to the position correction of both, further reducing the alignment difficulty and ultimately achieving efficient three-point precise positioning while ensuring the stability of the connection after riveting. When disassembly is required, the structural characteristics of the oblong hole also facilitate the quick removal of BMS 7 from BMS mounting bracket 1, improving the convenience of assembly and disassembly.

[0050] Furthermore, in the above embodiments, the material of the BMS fixing bracket 1 can be selected from metal (such as aluminum alloy) or composite material (such as carbon fiber reinforced resin) to adapt to different design requirements. When metal material is selected, it has high structural strength, strong resistance to deformation, and can also assist in heat dissipation of the BMS, making it suitable for scenarios with high load-bearing requirements. When composite material is selected, it can significantly reduce weight while ensuring strength, and has better corrosion resistance and insulation, making it suitable for scenarios with high requirements for lightweighting and insulation.

[0051] Furthermore, referring to Figure 8 In the above embodiment, a notch 13 is provided on the top surface 6 of the frame 3 near the expansion beam 2. The notch 13 communicates with the first weight-reducing groove 11.1 to form a heat dissipation channel.

[0052] During operation, the Battery Management System (BMS) continuously generates heat. If this heat accumulates over a long period and cannot be dissipated in time, it will not only reduce the efficiency and shorten the lifespan of the internal components of the BMS, but may also cause thermal management imbalance in the battery pack due to excessively high local temperatures, and even affect the charging and discharging performance and safety of the battery cells. The above-mentioned technical solution, through the heat dissipation channel formed by the connection between the notch 13 and the first weight reduction groove 11.1, can accelerate the air circulation inside the BMS mounting bracket 1, quickly remove the heat transferred to the BMS mounting bracket 1 during the operation of the BMS 7, effectively reduce the operating temperature of the BMS 7, ensure its stable operation, and also support the optimization of the overall thermal environment inside the battery pack.

[0053] Furthermore, continue to refer to Figure 8 In the above embodiment, the plurality of weight-reducing grooves 11 also include a second weight-reducing groove 11.2. The second weight-reducing groove 11.2 is located below the first weight-reducing groove 11.1 and is adjacent to the first weight-reducing groove 11.1.

[0054] By adopting the above technical solution, by adding a second weight-reducing groove 11.2 below the first weight-reducing groove 11.1, the height of the first weight-reducing groove 11.1 can be naturally raised, thereby providing sufficient operating space. This design ensures that when workers perform riveting operations through the riveting holes 12 on the bottom surface of the first weight-reducing groove 11.1, the BMS fixing bracket 1 or riveting tools will not directly contact the components below due to insufficient space, thus ensuring that the riveting work is completed smoothly.

[0055] Furthermore, referring to Figures 8-9 In the above embodiment, the top surface 6 of the frame 3 has a convex structure, with a highest protrusion 6.1 and two lower portions 6.2 that are recessed relative to the highest protrusion, and the two lower portions 6.2 are symmetrically distributed about the highest protrusion 6.1. An ear portion 9 is disposed on the highest protrusion 6.1, and the mounting hole 8 includes a first mounting hole 8.1 and a second mounting hole 8.2. The first mounting hole 8.1 and the second mounting hole 8.2 are respectively disposed on the two lower portions 6.2.

[0056] By employing the above technical solution, and placing the first mounting hole 8.1 and the second mounting hole 8.2 symmetrically on the lower part 6.2, the BMS 7 can be stably fixed to the BMS fixing bracket 1 using the two-point symmetrical force characteristics, avoiding tilting or loosening caused by uneven force at a single point. Simultaneously, integrating the ear 9 into the highest protrusion 6.1 utilizes the structural rigidity of the protrusion to enhance the connection strength between the ear 9 and the expansion beam 2, ensuring that the bracket 1 as a whole is stably fixed to the expansion beam via the ear 9.

[0057] Furthermore, referring to Figure 8 In the above embodiment, the frame 3 is provided with a plurality of weight reduction grooves 11, and the plurality of weight reduction grooves 11 penetrate the BMS fixing bracket 1 along the thickness direction Y.

[0058] By adopting the above technical solution, on the one hand, the weight of the bracket can be significantly reduced by removing materials in non-stressed areas while ensuring the overall structural strength of the BMS fixing bracket 1, thereby indirectly reducing the total weight of the battery pack and improving energy density; on the other hand, the through-type weight reduction groove 11 not only makes it easy for workers to visually observe the alignment of key parts such as rivet holes during assembly, but also provides sufficient space for the insertion and operation of riveting tools, effectively reducing assembly difficulty and improving work efficiency.

[0059] Furthermore, in the above embodiment, a limiting plate (not shown in the figure) perpendicular to the top surface 6 is also provided on the top surface 6. The plane where the limiting plate is located is coplanar with the opposite side of the BMS fixing bracket 1, and the limiting plate is used to abut against the BMS during assembly to limit its contact with the expansion beam.

[0060] By adopting the above technical solution, the assembly boundary of BMS 7 on the BMS mounting bracket 1 can be clearly defined structurally, effectively preventing BMS 7 from directly contacting the adjacent expansion beam 2 due to assembly misalignment, vibration displacement, or other reasons. This avoids component wear caused by contact friction between BMS 7 and expansion beam 2, and also prevents signal interference or structural interference problems that may be caused by their contact, further ensuring the stable operation of the BMS and the safety of the internal structure of the battery pack.

[0061] Furthermore, referring to Figure 9 The frame 3 is enclosed by a top frame 3.1, a side frame 3.2, and a bottom frame 3.3, and is symmetrical about the central axis in the height direction. The top surface 6 is the plane containing the top frame 3.1. The bottom frame 3.3 includes a first bottom frame 3.3.1 perpendicular to the height direction Z, and two second bottom frames 3.3.2 connected to both ends of the first bottom frame 3.3.1 and extending outward at an angle to the side frame 3.2. The angles between the second bottom frames 3.3.2 and the first bottom frame 3.3.1 and the side frame 3.2 are all obtuse angles.

[0062] By adopting the above technical solution, by setting the connection angle between the second bottom frame 3.3.2 and the adjacent frame to an obtuse angle, on the one hand, the redundant materials required for traditional right-angle or acute-angle connections can be replaced, thereby reducing the overall material usage of the frame and achieving weight reduction, further reducing the total weight of the battery pack; on the other hand, the obtuse angle connection can optimize the force transmission path between the frames, avoid stress concentration at the connection node, and better disperse the impact of external vibration or expansion force compared to right-angle connections, thus ensuring that the frame has good structural strength and deformation resistance while reducing weight, taking into account both lightweight and reliability.

[0063] This utility model also provides a battery pack, including the BMS fixing bracket in any of the above embodiments.

[0064] By adopting the above technical solution, thanks to the excellent structural strength of the BMS mounting bracket 1, it can stably support and fix the BMS 7 for a long time, effectively resisting the vibration, impact and stress inside the battery pack during vehicle operation, avoiding problems such as loose interfaces and poor contact of sampling harnesses caused by bracket deformation or displacement of the BMS 7, and ultimately significantly improving the continuity and accuracy of battery pack data transmission, and strengthening the overall operational stability.

[0065] Furthermore, in the above embodiments, reference is made to Figure 6 and Figure 8 The mounting holes 8 include a first mounting hole 8.1 and a second mounting hole 8.2. The frame 3 has multiple weight-reducing slots 11. These slots 11 extend along the thickness direction Y through the BMS mounting bracket 1. Each weight-reducing slot 11 includes a first weight-reducing slot 11.1. The bottom surface of the first weight-reducing slot 11.1 has a riveting hole 12. The BMS mounting bracket 1 is also riveted to the BMS 7 through the riveting hole 12. The riveting hole 12 is located between the first mounting hole 8.1 and the second mounting hole 8.2 along the first direction X. The battery pack also includes:

[0066] Lower housing;

[0067] Multiple battery cells;

[0068] Expansion beam 2 is fixed to the lower housing and located between the battery cell and the side wall of the lower housing. The bottom of expansion beam 2 facing the BMS mounting bracket 1 is provided with a first guide part 14 (see reference). Figure 5 The bottom of the BMS mounting bracket 1 is provided with a second guide portion 15 that is adapted to the first guide portion 14 (see reference). Figure 7 and Figure 12 The expansion beam 2 has a tongue (not shown in the figure) extending outward along its thickness direction Y. Riveting holes are positioned opposite the tongue along the height direction Z. The BMS 7, BMS fixing bracket 1, and expansion beam 2 are riveted together as a single unit via the riveting holes and the tongue. The assembled unit can be referenced... Figures 1-5 Notably, the rivet holes are oblong.

[0069] By adopting the above technical solution, the matching design of the first guide part 14 and the second guide part 15 can guide the BMS fixing bracket 1 to quickly align with the preset installation position of the expansion beam 2 during assembly, significantly reducing the alignment adjustment time and achieving efficient pre-assembly of both. Based on this, by utilizing the height correspondence between the oblong hole and the tongue, the relative positions of the BMS 7, the BMS fixing bracket 1, and the expansion beam 2 can be further precisely positioned. The fine-tuning allowance of the oblong hole compensates for assembly errors, and finally, a stable integrated structure is formed through riveting. Specifically, the first guide part 14 and the second guide part 15 can be in the form of a ramp.

[0070] 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 BMS mounting bracket for fixing a BMS to a battery pack, the battery pack comprising a lower housing, a plurality of battery cells, and an expansion beam, the expansion beam being fixed to the lower housing and located between the battery cells and the side wall of the lower housing, characterized in that, The BMS mounting bracket includes: The frame is composed of multiple connected side frames and has a front and a back side facing each other along the thickness direction. The front and the back side are perpendicular to the top surface of the frame. The front side abuts against the BMS, and the back side abuts against the side wall of the expansion beam. The top surface is provided with multiple mounting holes distributed along a first direction. The BMS fixing bracket is riveted to the BMS through the mounting holes. The first direction is perpendicular to both the thickness direction and the height direction. The ear portion, including multiple portions, is distributed along the first direction and extends from the top surface of the frame along the height direction. The ear portion is provided with a connection hole, and the BMS fixing bracket is riveted to the expansion beam through the connection hole.

2. The BMS fixing bracket according to claim 1, characterized in that, The mounting holes include a first mounting hole and a second mounting hole. The frame body is provided with a plurality of weight-reducing grooves. The plurality of weight-reducing grooves pass through the BMS fixing bracket along the thickness direction. The plurality of weight-reducing grooves include a first weight-reducing groove. The bottom surface of the first weight-reducing groove is provided with a riveting hole. The BMS fixing bracket is also riveted to the BMS through the riveting hole. The riveting hole is located between the first mounting hole and the second mounting hole along the first direction.

3. The BMS fixing bracket according to claim 2, characterized in that, The rivet hole is a waist-shaped hole.

4. The BMS fixing bracket according to claim 2, characterized in that, A notch is provided on the top surface of the frame near the expansion beam, and the notch communicates with the first weight-reducing groove to form a heat dissipation channel.

5. The BMS fixing bracket according to claim 2, characterized in that, The plurality of weight-reducing slots also include a second weight-reducing slot, which is located below and adjacent to the first weight-reducing slot.

6. The BMS fixing bracket according to claim 1, characterized in that, The top surface of the frame has a convex structure, with a highest convex part and two lower parts that are recessed relative to the highest convex part, and the two lower parts are symmetrically distributed about the highest convex part. The ear part is disposed on the highest convex part. The mounting hole includes a first mounting hole and a second mounting hole, and the first mounting hole and the second mounting hole are respectively disposed on the two lower parts.

7. The BMS fixing bracket according to claim 1, characterized in that, The top surface is also provided with a limiting plate perpendicular to the top surface. The plane where the limiting plate is located is coplanar with the opposite side of the BMS fixing bracket. The limiting plate is used to abut against the BMS during assembly to limit its contact with the expansion beam.

8. The BMS fixing bracket according to claim 1, characterized in that, The frame is formed by a top frame, a side frame, and a bottom frame, and is symmetrical about a central axis extending along the height direction. The top surface is the plane where the top frame is located. The bottom frame includes a first bottom frame perpendicular to the height direction and two second bottom frames that are respectively connected to the two ends of the first bottom frame and extend outward at an angle and are connected to the side frame. The angles between the second bottom frames and the first bottom frame and the side frame are all obtuse angles.

9. A battery pack, characterized in that, Includes the BMS mounting bracket as described in any one of claims 1-8.

10. The battery pack according to claim 9, characterized in that, The mounting holes include a first mounting hole and a second mounting hole. The frame contains multiple weight-reducing grooves that extend through the BMS mounting bracket along the thickness direction. Each weight-reducing groove includes a first weight-reducing groove, the bottom surface of which has a riveting hole. The BMS mounting bracket is also riveted to the BMS through the riveting hole, which is located between the first and second mounting holes along the first direction. The battery pack also includes: Lower housing; Multiple battery cells; An expansion beam is fixed to the lower housing and located between the battery cell and the side wall of the lower housing. The bottom of the expansion beam facing the BMS mounting bracket has a first guide portion. The bottom of the BMS mounting bracket has a second guide portion that matches the first guide portion. The expansion beam has a tongue that extends outward along its thickness direction. The riveting hole is arranged opposite to the tongue along the height direction. The BMS, the BMS mounting bracket, and the expansion beam are riveted together as a single structure through the riveting hole and the tongue.

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