Detachable double-layer BMS structure, battery box body and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a detachable double-layer BMS (Battery Management System) structure, a battery box body and a battery pack, the detachable double-layer BMS structure comprises a bottom beam, a top beam, a first fastener, a second fastener and two BMS modules; the bottom beam and the top beam are each of a pipeline structure internally provided with a through hole, and the top beam is located on the top of the bottom beam and detachably connected with the bottom beam. The first fastener is respectively connected with one BMS module and the bottom beam, and enables one BMS module to be fixed at the top of the bottom beam; the second fastener is respectively connected with the other BMS module and the top beam, and enables the other BMS module to be fixed at the top of the top beam; the technical problem that an existing double-layer BMS structure is poor in structural reliability is mainly solved.

Description

Technical Field

[0001] This utility model relates to the technical field of batteries, and in particular to a detachable double-layer BMS structure, a battery box, and a battery pack. Background Technology

[0002] With increasingly higher energy density requirements for battery packs, one current technical solution is to divide the large-scale BMS (Battery Management System) into a single master BMS module and at least two slave BMS modules. The two slave BMS modules are then arranged sequentially along the vertical direction, thereby increasing the energy density of the battery pack. In the battery field, BMS is also known as a battery management system. A BMS is an electrical module used for intelligent management and maintenance of battery cells. It connects to the battery module and electrical equipment (such as new energy vehicles), acting as a link between them. The main functions of a BMS include monitoring the status of the battery module, preventing overcharging and over-discharging, and extending the battery module's lifespan. The BMS controls and protects the battery module by collecting key parameters (such as voltage, current, and temperature) of each individual battery cell in real time.

[0003] Existing technology typically uses sheet metal brackets to support two slave BMS systems. Sheet metal brackets have drawbacks such as insufficient support strength and occupying a large installation space, which can have a certain impact on the service life of the BMS.

[0004] Therefore, improvements to existing technologies are necessary.

[0005] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0006] This utility model provides a detachable double-layer BMS structure, battery box and battery pack, which mainly solves the technical problem of poor structural reliability of the current double-layer BMS structure.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A detachable double-layer BMS structure includes a bottom beam, a top beam, a first fastener, a second fastener, and two BMS modules;

[0009] Both the bottom beam and the top beam are pipe structures with internal through holes. The top beam is located on top of the bottom beam and is detachably connected to the bottom beam.

[0010] The first fastener connects one of its BMS modules and the bottom beam respectively, and fixes one of its BMS modules to the top of the bottom beam;

[0011] The second fastener connects the other BMS module and the top beam respectively, and fixes the other BMS module to the top of the top beam.

[0012] In one possible implementation, the double-layer BMS structure further includes a third fastener, which connects the bottom beam and the top beam respectively;

[0013] The bottom beam includes a main body and at least one support portion protruding from the top of the main body;

[0014] The first fastener connects one of its BMS modules and the main body respectively, and fixes one of its BMS modules to the top of the main body;

[0015] The third fastener connects the top beam and the support portion respectively.

[0016] In one possible implementation, the opposite ends of one of the BMS modules are respectively fixed to the top of the main body of the two bottom beams by the first fastener;

[0017] The two opposite ends of the other BMS module are respectively fixed to the top of the two top beams by the second fastener;

[0018] The two top beams are respectively fixed to the support parts of the two bottom beams by the third fastener.

[0019] In one possible implementation, at least one end of the top beam is provided with an inclined cutout structure, and the third fastener is disposed at the cutout structure and received within a through hole in the top beam.

[0020] In one possible implementation, the first fastener / second fastener / third fastener includes connected rivet nuts and bolts, and the bottom beam / top beam is provided with mounting holes for placing the rivet nuts.

[0021] In one possible implementation, the two BMS modules are staggered along the length of the bottom beam / top beam, and the distance between the two BMS modules is greater than or equal to 20mm.

[0022] This application also provides a battery housing, including a frame and the aforementioned detachable double-layer BMS structure, wherein the bottom beam is fixedly connected to the frame.

[0023] In one possible implementation, the frame includes an outer frame and a crossbeam disposed within the outer frame, the crossbeam dividing the frame into a first region and a second region, the first region being used to house at least a battery module, and the detachable double-layer BMS structure being housed within the second region.

[0024] In one possible implementation, the outer frame includes a front panel spaced apart from the crossbeam, a bottom beam connected between the crossbeam and the front panel, an adapter frame fixed to the inner wall of the front panel facing the crossbeam, one end of the top beam fixedly connected to the bottom beam, and the other end of the top beam fixedly connected to the adapter frame.

[0025] This application also provides a battery pack, including a battery module and the battery housing described above.

[0026] Compared with the prior art, the detachable double-layer BMS structure provided by this utility model has at least the following beneficial effects:

[0027] This solution can be installed in the following order: first, fix the first BMS module to the bottom beam with the first fastener, then fix the top beam to the top of the bottom beam, and then fix the second BMS module to the top of the top beam with the second fastener.

[0028] This solution allows the dual-layer BMS modules to be fixed at different heights, saving internal space in the battery pack and thus increasing its energy density. Furthermore, it facilitates easy disassembly, meeting the need to install or remove the dual-layer BMS modules within the limited space of the battery pack. Additionally, the bottom and top beams of this solution are internally perforated pipe structures, resulting in greater structural strength and improved stability after installation of the dual-layer BMS modules. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0030] Figure 1 A schematic diagram of a detachable double-layer BMS structure provided in Embodiment 1 of this application;

[0031] Figure 2 An exploded view of a detachable double-layer BMS structure provided in Embodiment 1 of this application;

[0032] Figure 3A front view of a detachable double-layer BMS structure provided in Embodiment 1 of this application;

[0033] Figure 4 This is a schematic diagram of the structure of a battery box provided in Embodiment 2 of this application;

[0034] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0035] The following are the labeling elements in the figure:

[0036] 1. Frame; 11. Outer frame; 111. Front panel; 12. Crossbeam; 13. First area; 14. Second area; 15. Adapter frame;

[0037] 2. Double-layer BMS structure; 21. Bottom beam; 211. Main body; 212. Support; 22. Top beam; 221. Through hole; 222. Cutout structure; 223. Mounting hole; 23. First fastener; 231. Rivet nut; 232. Bolt; 24. Second fastener; 25. BMS module; 26. Third fastener. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0039] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0040] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0043] Example 1

[0044] Please refer to the following: Figures 1 to 3 This utility model embodiment provides a detachable double-layer BMS structure, including a bottom beam 21, a top beam 22, a first fastener 23, a second fastener 24, and two BMS modules 25. Both the bottom beam 21 and the top beam 22 are pipe structures with internal through holes 221. The bottom beam 21 and the top beam 22 can also be understood as profile structures, which have higher structural strength compared to sheet metal parts, and are therefore less prone to deformation under stress. The top beam 22 is arranged on top of the bottom beam 21 and is detachably connected to it. The first fastener 23 connects one of the BMS modules 25 to the bottom beam 21, fixing one of the BMS modules 25 to the top of the bottom beam 21. The second fastener 24 connects the other BMS module 25 to the top beam 22, fixing the other BMS module 25 to the top of the top beam 22. This allows the two BMS modules 25 to be arranged vertically at intervals, saving internal space in the battery pack and thus increasing the energy density of the battery pack.

[0045] Please refer to them again. Figures 1 to 3 The double-layer BMS structure of this embodiment also includes a third fastener 26, which connects the bottom beam 21 and the top beam 22 respectively. By providing the third fastener 26, assembly or disassembly between the bottom beam 21 and the top beam 22 is facilitated. This embodiment can be installed in the following order: first, the first BMS module 25 is fixed to the bottom beam 21 using the first fastener 23; then, the top beam 22 is fixed to the top of the bottom beam 21 using the third fastener 26; next, the second BMS module 25 is fixed to the top of the top beam 22 using the second fastener 24. When disassembly is required, all the second fasteners 24 can be removed first, allowing the removal of the upper-layer BMS module 25; then, all the third fasteners 26 can be removed, allowing the removal of the top beam 22; finally, all the first fasteners 23 can be removed, allowing the removal of the lower-layer BMS module 25. Therefore, this solution has the advantage of being easy to install and remove, meeting the requirement of installing or removing the double-layer BMS module 25 within the limited space of the battery pack. At the same time, since the bottom beam 21 and top beam 22 of this solution are both pipe structures with through holes 221 inside, the structural strength of the bottom beam 21 and top beam 22 is relatively large, which makes the stability of the double-layer BMS module 25 after installation better, thus ensuring that the battery has a high degree of safety.

[0046] Please refer to them again. Figures 1 to 3Because the BMS module 25 in this embodiment is relatively long, both ends of the lower layer BMS module 25 are fixed to the main body 211 of the two bottom beams 21, and both ends of the upper layer BMS module 25 are fixed to the two top beams 22. The two top beams 22 are fixed to the support parts 212 of the two bottom beams 21. In other words, this embodiment uses two bottom beams 21 and two top beams 22 to form a detachable double-layer BMS structure, thereby further improving the stability of the two BMS modules 25 and ensuring that the battery has high safety.

[0047] Please refer to them again. Figures 1 to 3 The bottom beam 21 specifically includes a main body 211 and a support 212 protruding from the top of the main body 211. The first fastener 23 connects the lower BMS module 25 and the main body 211 respectively, so that one of the BMS modules 25 is fixed on the top of the main body 211. The third fastener 26 connects the top beam 22 and the support 212 respectively, so that the top beam 22 is fixed above the support 212 and separated from the lower BMS module 25 by a certain distance, so as to avoid the top beam 22 and the lower BMS module 25 interfering with each other.

[0048] Please refer to them again. Figures 1 to 3 At least one end of the top beam 22 is provided with an inclined cut structure 222, which exposes the internal through hole 221 of the top beam 22 upwards. The aforementioned third fastener 26 is disposed at one end of the cut structure 222 and is received within the through hole 221 of the top beam 22. With this design, the third fastener 26 can be pressed against the bottom wall inside the through hole 221 of the top beam 22. Compared with the solution where the third fastener 26 is pressed against the top surface of the top beam 22, the third fastener 26 in this solution is not affected by the deformation of the top beam 22 itself and is therefore less prone to loosening, thereby improving the firmness between the top beam 22 and the bottom beam 21, and thus improving the safety of the battery.

[0049] In this embodiment, the first fastener 23, the second fastener 24, and the third fastener 26 preferably include connected rivet nuts 231 and bolts 232. The bottom beam 21 and the top beam 22 each have mounting holes 223 at predetermined positions. These mounting holes 223 are used to place the rivet nuts 231. During installation, the two corresponding objects can be connected simply by connecting the bolts 232 with a corresponding rivet nut 231. The combination structure of rivet nuts 231 and bolts 232 simplifies the overall installation and reduces costs.

[0050] Please see Figure 3The two BMS modules 25 are staggered along the length of the bottom beam 21 or the top beam 22, and the distance L between the two BMS modules 25 is greater than or equal to 20mm, so that there is more space for the cables connected to the BMS module 25 on the lower layer.

[0051] Example 2

[0052] Please refer to the following: Figure 4 and Figure 5 This embodiment provides a battery box, including a frame 1 and a detachable double-layer BMS structure 2 as described in Embodiment 1 above. The bottom beam 21 is pre-fixed inside the frame 1. The bottom beam 21 and the frame 1 can be connected together by welding or by using connectors. In this embodiment, the bottom beam 21 is preferably welded to the frame 1 and cannot be disassembled relative to the frame 1.

[0053] Specifically, the frame 1 includes an outer frame 11 and a crossbeam 12 disposed inside the outer frame 11. The crossbeam 12 improves the rigidity of the frame 1 and solves the problem of easy deformation of the frame 1 under external force. At the same time, the crossbeam 12 also divides the frame 1 into a first region 13 and a second region 14. The first region 13 is used to place the battery module. The crossbeam 12 can be used to abut against the side of the battery module to make the battery module stable within the first region 13. The second region 14 is at least used to accommodate the above-mentioned detachable double-layer BMS structure 2. The second region 14 can also be used to accommodate part of the liquid cooling pipes so that the coolant can flow into the battery module located in the first region 13.

[0054] More specifically, the outer frame 11 includes a front panel 111 at the front end, with the front panel 111 and the crossbeam 12 spaced apart. A bottom beam 21 connects the crossbeam 12 and the front panel 111. The front panel 111 is used to install at least some pre-set connectors (such as charging connectors, discharging connectors, liquid inlet connectors, liquid outlet connectors, etc.). An adapter frame 15 is pre-welded to the inner wall of the side of the front panel 111 facing the crossbeam 12. The adapter frame 15 is L-shaped and has a wall thickness of 2mm. Please refer to [further details]. Figure 1 , Figure 3 and Figure 5 The bottom beam 21 has only one support part 212 protruding from it. One end of the top beam 22 is fixedly connected to the bottom beam 21, and the other end of the top beam 22 is fixedly connected to the adapter frame 15. With this design, the adapter frame 15 will not occupy the installation space of the lower BMS module 25, making the overall assembly space of the double-layer BMS structure 2 more compact and reasonable.

[0055] The battery housing in this embodiment adopts the aforementioned double-layer BMS structure 2, which has the advantages of improving battery safety and battery energy density.

[0056] Example 3

[0057] This embodiment provides a battery pack, which includes a battery module and the battery housing of the above embodiment 2. The battery module is housed in the first region 13. Since the battery pack of this embodiment uses the above-mentioned battery housing, it has the advantages of high safety and high battery energy density.

[0058] The above are merely preferred embodiments of the present utility model, and only specifically describe the technical principles of the present utility model. These descriptions are only for explaining the principles of the present utility model and should not be construed as limiting the scope of protection of the present utility model in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model, as well as other specific embodiments of the present utility model that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present utility model.

Claims

1. A detachable double-layer BMS structure, characterized in that, It includes a bottom beam (21), a top beam (22), a first fastener (23), a second fastener (24), and two BMS modules (25). Both the bottom beam (21) and the top beam (22) are pipe structures with through holes (221) inside. The top beam (22) is located on top of the bottom beam (21) and is detachably connected to the bottom beam (21). The first fastener (23) connects one of its BMS modules (25) and the bottom beam (21) respectively, and fixes one of its BMS modules (25) to the top of the bottom beam (21); The second fastener (24) connects the other BMS module (25) and the top beam (22) respectively, and fixes the other BMS module (25) to the top of the top beam (22).

2. The detachable double-layer BMS structure as described in claim 1, characterized in that, The double-layer BMS structure also includes a third fastener (26), which connects the bottom beam (21) and the top beam (22) respectively. The bottom beam (21) includes a main body (211) and at least one support (212) protruding from the top of the main body (211). The first fastener (23) connects one of its BMS modules (25) and the main body (211) respectively, and fixes one of its BMS modules (25) to the top of the main body (211); The third fastener (26) connects the top beam (22) and the support part (212) respectively.

3. The detachable double-layer BMS structure according to claim 2, characterized in that, One of the BMS modules (25) is fixed at opposite ends to the top of the main body (211) of the two bottom beams (21) by the first fastener (23); The opposite ends of the other BMS module (25) are respectively fixed to the tops of the two top beams (22) by the second fastener (24); The two top beams (22) are respectively fixed to the support (212) of the two bottom beams (21) by the third fastener (26).

4. The detachable double-layer BMS structure as described in claim 2, characterized in that, At least one end of the top beam (22) is provided with an inclined cut structure (222), and the third fastener (26) is provided at the cut structure (222) and received in the through hole (221) of the top beam (22).

5. The detachable double-layer BMS structure as described in any one of claims 2 to 4, characterized in that, The first fastener (23) / the second fastener (24) / the third fastener (26) includes a connected rivet nut (231) and a bolt (232), and the bottom beam (21) / the top beam (22) is provided with a mounting hole (223) for placing the rivet nut (231).

6. The detachable double-layer BMS structure as described in claim 1, characterized in that, The two BMS modules (25) are staggered along the length of the bottom beam (21) / top beam (22), and the distance between the two BMS modules (25) is greater than or equal to 20mm.

7. A battery housing, characterized in that, The system includes a frame (1) and a detachable double-layer BMS structure (2) as described in any one of claims 1 to 6, wherein the bottom beam (21) is fixedly connected to the frame (1).

8. The battery housing as described in claim 7, characterized in that, The frame (1) includes an outer frame (11) and a crossbeam (12) disposed within the outer frame (11). The crossbeam (12) divides the frame (1) into a first region (13) and a second region (14). The first region (13) is used to place the battery module at least. The detachable double-layer BMS structure (2) is housed within the second region (14).

9. The battery housing as described in claim 8, characterized in that, The outer frame (11) includes a front panel (111) spaced apart from the crossbeam (12), a bottom beam (21) connecting the crossbeam (12) and the front panel (111), a transition frame (15) fixed on the inner wall of the front panel (111) facing the crossbeam (12), one end of the top beam (22) fixedly connected to the bottom beam (21), and the other end of the top beam (22) fixedly connected to the transition frame (15).

10. A battery pack, characterized in that, Includes a battery module and a battery housing as described in any one of claims 7 to 9.

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