BDU fixing structure and battery module

Abstract

This invention provides a BDU fixing structure and a battery module, belonging to the field of new energy battery equipment technology. The BDU fixing structure includes a cell frame, ridge support arms, and a BDU bracket plate. The cell frame includes an end wall disposed on one side in the cell stacking direction. The ridge support arms are horizontally arranged, with one end fixedly connected to the top of the end wall. Multiple ridge support arms are provided and evenly spaced along the extension direction of the end wall. The BDU bracket plate is horizontally disposed above the multiple ridge support arms and fixedly connected to them. This invention solves the technical problems of low battery module utilization and overall energy density caused by the form defects of traditional BDU fixing structures in battery modules.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery equipment technology, and in particular to a BDU fixing structure and a battery module. Background Technology

[0002] In the battery system of electric vehicles, the BDU (Battery Disconnect Unit) plays a crucial role. It can quickly disconnect the circuit when the battery malfunctions, effectively protecting the battery and the vehicle's safety. Simultaneously, the BDU also features intelligent monitoring capabilities, enabling real-time monitoring of the battery status and providing the driver with accurate battery information.

[0003] In related technologies, BDU modules are usually integrated with battery modules in the battery pack housing. The conventional method is to install horizontal and vertical beams above the battery modules after they are placed in the housing, and fix the BDU modules to the horizontal and vertical beams with brackets.

[0004] To avoid interference with the terminal posts and other structures on top of the battery module, the supporting horizontal and vertical beam structures need to be installed entirely above the busbars and other structures of the battery module, as per the relevant technical specifications. This arrangement occupies storage space within the battery pack housing in the vertical direction, restricts the cell specifications that can be used in the battery module, and results in a reduction in the volume utilization rate and overall energy density of the battery pack housing. Utility Model Content

[0005] This utility model provides a BDU fixing structure and a battery module, which can solve the technical problems of low battery module utilization and overall energy density caused by the formal defects of the BDU fixing structure in traditional battery modules. The technical solution is as follows:

[0006] In a first aspect, this utility model provides a BDU fixing structure, including: a cell frame, a ridge support arm, and a BDU bracket plate.

[0007] The cell frame includes an end wall disposed on one side in the cell stacking direction. The ridge support arm is horizontally arranged and one end is fixedly connected to the top of the end wall. Multiple ridge support arms are provided and are evenly spaced along the extension direction of the end wall. The BDU bracket plate is horizontally disposed above the multiple ridge support arms and is fixedly connected to the ridge support arms.

[0008] Optionally, the BDU bracket plate is detachably connected to the ridge support arm.

[0009] Optionally, a positioning nut is provided on the spur support arm, and a first screw hole matching the positioning nut is provided on the BDU bracket plate.

[0010] Optionally, a support block is provided at the top of the spur support arm, and the positioning nut is embedded in the support block.

[0011] Optionally, the support block is detachably connected to the ridge support arm.

[0012] Optionally, a second screw hole is provided at the top of the end wall, and a third screw hole matching the second screw hole is provided on the BDU bracket plate.

[0013] Optionally, the BDU bracket plate has connecting bosses on the side face near the ridge support arm, corresponding to the first screw hole and the third screw hole.

[0014] Optionally, the length of the ridge support arm is greater than the width of the BDU bracket plate in the direction perpendicular to the end wall.

[0015] Secondly, this utility model provides a battery module, including the BDU fixing structure described in the first aspect, and also including a BDU module and multiple cell modules. The BDU module is mounted on the BDU support plate, and the cell module includes multiple individual cells arranged in sequence. The multiple cell modules are arranged side by side in the cell frame, and the dragon spine support arm is fixedly disposed on the shoulder of the individual cell in two adjacent cell modules.

[0016] Optionally, it also includes an elastic cushioning pad disposed on top of the BDU module.

[0017] The beneficial effects of the technical solution provided in this utility model include at least the following:

[0018] The novel BDU fixing structure provided in this embodiment optimizes the existing BDU unit installation method in new energy batteries. During the battery module formation stage, the fixing structure of the cell module is improved. On one end wall of the cell frame, which is used to limit the installation of the cell module formed by stacking individual cells, a ridge support arm is provided at the shoulder contact point of the individual cells between adjacent modules, with one side connected to the end wall and the other side extending into the cell frame, according to the arrangement and installation dimensions of the internal cell modules. A BDU bracket plate is laid above to provide a mounting position for the BDU unit. This effectively utilizes the empty space existing during the arrangement of the lower cell modules to set up the support structure, integrating the BDU unit fixing structure with the battery module. After being installed in the battery pack housing, there is no need to build additional horizontal and vertical beam structures, effectively reducing the vertical space occupation and solving the technical problems of low battery module utilization and overall energy density caused by the form defects of the traditional BDU fixing structure in battery modules. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this utility model, the accompanying 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.

[0020] Figure 1 This is a three-dimensional structural diagram of the battery module provided in this utility model embodiment;

[0021] Figure 2 This is a partial structural diagram of one side of the BDU fixing structure provided in this utility model embodiment;

[0022] Figure 3 This is a partial structural diagram of the other side of the BDU fixing structure provided in this utility model embodiment;

[0023] Figure 4 This is a partial structural side view of the BDU fixing structure provided in this utility model embodiment;

[0024] Figure 5 This is a three-dimensional structural diagram of the end wall of the BDU fixing structure provided in this utility model embodiment;

[0025] Figure 6 This is a three-dimensional structural diagram of the spur support arm in the BDU fixing structure provided in this utility model embodiment;

[0026] Figure 7 This is a three-dimensional structural diagram of the BDU support plate in the BDU fixing structure provided in this utility model embodiment.

[0027] In the diagram: 1-cell frame; 2-dragon spine support arm; 3-BDU bracket plate; 4-BDU module; 5-cell module; 6-elastic buffer pad; 11-end wall; 21-positioning nut; 22-support block; 31-first screw hole; 32-third screw hole; 33-connecting boss; 51-single cell; 111-second screw hole. Detailed Implementation

[0028] 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.

[0029] Figure 1 This is a three-dimensional structural diagram of the battery module provided in this utility model embodiment; Figure 2 This is a partial structural diagram of one side of the BDU fixing structure provided in this utility model embodiment; Figure 3 This is a partial structural diagram of the other side of the BDU fixing structure provided in this utility model embodiment; Figure 4This is a partial structural side view of the BDU fixing structure provided in this utility model embodiment; Figure 5 This is a three-dimensional structural diagram of the end wall of the BDU fixing structure provided in this utility model embodiment; Figure 6 This is a three-dimensional structural diagram of the spur support arm in the BDU fixing structure provided in this utility model embodiment; Figure 7 This is a three-dimensional structural diagram of the BDU support plate in the BDU fixing structure provided in this utility model embodiment. (See diagram below.) Figures 1 to 7 As shown, this utility model provides a BDU fixing structure, including: a cell frame 1, a ridge support arm 2, and a BDU bracket plate 3.

[0030] The battery cell frame 1 includes an end wall 11 disposed on one side of the battery cell stacking direction, a ridge support arm 2 arranged horizontally and one end fixedly connected to the top of the end wall 11, multiple ridge support arms 2 are provided and are evenly spaced along the extension direction of the end wall 11, and a BDU bracket plate 3 is horizontally disposed above the multiple ridge support arms 2 and fixedly connected to the ridge support arms 2.

[0031] In this embodiment of the invention, the BDU fixing structure is used in conjunction with the cell module 5 installed inside the battery pack housing. The cell module 5 is formed by stacking multiple rectangular individual cells 51 horizontally with their large surfaces attached one on top of the other, and connecting them in series and parallel by setting busbars and other connecting components on the top. The cell frame 1 is formed by four side plates. According to the actual power requirements of the battery pack, the cell module formed by stacking multiple rows of individual cells 51 is arranged side by side in the receiving space enclosed by the cell frame 1. The two side plates of the cell frame 1 in the stacking direction of the individual cells 51 can serve as end plates of the cell module 5 and contact the individual cells 51 located at both ends. In this embodiment of the invention, one of these two side plates serves as the end wall 11 mentioned in this application. A ridge support arm 2 is horizontally connected to one end wall 11, with the other end of the ridge support arm 2 extending into the space enclosed by the cell frame 1. Each ridge support arm 2 is positioned above the shoulder of an adjacent single cell 51 in two adjacent cell modules 5, specifically above the contact point of two single cells 51 whose two small faces of the cuboid meet. This position is precisely located in the empty space at the edge of the busbar connecting the terminal post of the single cell 51 above the two sets of cell modules 5. The ridge support arm 2 is fixedly connected to the single cell 51 below using structural adhesive. Multiple ridge support arms 2 together form a support bracket structure along the extension direction of the end wall 11. By horizontally fixing a BDU bracket plate 3 on top as the mounting plane for the BDU unit, the BDU module 4 can be installed on it, forming an integrated mounting structure of the BDU unit and the cell module 5. After forming the battery module, they can be installed together into the battery pack box.

[0032] The novel BDU fixing structure provided in this embodiment optimizes the existing BDU unit installation method in new energy batteries. During the battery module formation stage, the fixing structure of the cell module 5 is improved. On one side end wall 11 of the cell frame 1, which is used to limit the installation of the cell module 5 formed by stacking individual cells 51, a ridge support arm 2 is provided at the shoulder contact point of the individual cells 51 between adjacent modules, with one side connected to the end wall 11 and the other side extending into the cell frame 1, according to the internal cell module 5 arrangement dimensions. A BDU bracket plate 3 is laid above to provide a mounting position for the BDU unit. This effectively utilizes the empty space existing during the arrangement of the lower cell modules to set up the support structure, integrating the BDU unit fixing structure with the battery module. After being installed in the battery pack housing, there is no need to build additional horizontal and vertical beam structures, which effectively reduces the space occupied in the longitudinal direction and solves the technical problems of low battery module utilization and overall energy density caused by the form defects of the BDU fixing structure in traditional battery modules.

[0033] Optionally, the BDU bracket plate 3 and the ridge support arm 2 are detachably connected. Exemplarily, in this embodiment of the invention, the BDU bracket plate 3 is detachably connected to the ridge support arm 2 after the ridge support arm 2 is laid, facilitating independent production and assembly. For example, the ridge support arm 2 is provided with a positioning nut 21, and the BDU bracket plate 3 is provided with a first screw hole 31 that matches the positioning nut 21. After the BDU bracket plate 3 is assembled, the first screw hole 31 on it aligns with the inner hole of the positioning nut 21 on the lower ridge support arm 2. At this point, a fixed connection can be achieved by screwing in screws from top to bottom, resulting in a simple structure and convenient assembly / disassembly.

[0034] Optionally, a support block 22 is provided at the top of the ridge support arm 2, and a positioning nut 21 is embedded in the support block 22. Further, in this embodiment of the invention, a detachable mat at the top of the ridge support arm 2 is provided with a support block 22, and the positioning nut 21 is embedded inside the support block 22. The support block 22 contacts and connects with the upper BDU bracket plate 3, and serves as a relay component for the positioning nut 21. After the ridge support arm 2 is installed, a corresponding installation position can be selected on the ridge support arm 2 according to the specifications of the BDU bracket plate 3 to mate with BDU bracket plates 3 of different widths. Structural adhesive is used to fix the support block 22, making assembly convenient and improving adaptability.

[0035] Optionally, a second screw hole 111 is provided at the top of the end wall 11, and a third screw hole 32 matching the second screw hole 111 is provided on the BDU bracket plate 3. Exemplarily, in this embodiment of the invention, in addition to providing connection points on the section of the ridge support arm 2 extending into the space of the battery cell frame 1 to support and connect the BDU bracket plate 3, a second screw hole 111 can also be provided on the corresponding end wall 11 as an additional connection point, corresponding to the third screw hole 32 on the BDU bracket plate 3. After placement, the BDU bracket plate 3 achieves multi-point threaded connection on both sides in the width direction, further improving the structural connection stability.

[0036] Optionally, a connecting boss 33 is provided on the side of the BDU bracket plate 3 near the ridge support arm 2 at positions corresponding to the first screw hole 31 and the third screw hole 32. Exemplarily, in this embodiment of the invention, by providing a connecting boss 33 protruding downwards at the threaded connection points corresponding to the first screw hole 31 and the third screw hole 32, the local thickness at the threaded connection point can be increased. This prevents deformation or cracking at the contact point between the BDU bracket plate 3 and the ridge support arm 2 due to stress concentration or stress generated by external loads when screws are tightened, further improving the structural connection stability.

[0037] Optionally, the length of the ridge support arm 2 is greater than the width of the BDU bracket plate 3 in the direction perpendicular to the end wall 11. Exemplarily, in this embodiment of the invention, the ridge support arm 2 is only provided to support the BDU bracket plate 3 and to provide connection points. Therefore, its length only needs to be slightly greater than the length of the BDU bracket plate 3, or allowance based on the possible length of a BDU bracket plate 3 of the same specification. It does not need to be a horizontal frame on the opposite sides of the entire cell frame 1, further reducing the overall material usage and weight after installation, reducing the stress acting on the lower cell module 5, and meeting the lightweight requirements.

[0038] refer to Figures 1 to 7 This utility model also provides a battery module, including the aforementioned BDU fixing structure, as well as a BDU module 4 and multiple cell modules 5. The BDU module 4 is mounted on the BDU support plate 3. The cell module 5 includes multiple individual cells 51 arranged in sequence. The multiple cell modules 5 are arranged side by side in the cell frame 1. The ridge support arm 2 is fixedly installed on the shoulder of the individual cell 51 in two adjacent cell modules 5. With this integrated battery module, after being installed in the battery pack housing, there is no need to build additional horizontal and vertical beam structures, effectively reducing the vertical space occupation and solving the technical problems of low battery module utilization and low overall energy density caused by the form defects of the BDU fixing structure in traditional battery modules in related technologies.

[0039] Optionally, an elastic buffer pad 6 is also included, which is disposed on the top of the BDU module 4. Exemplarily, in this embodiment of the invention, since the upper and lower structures of the ridge support arm 2 are fixed with structural adhesive, in order to reduce the risk caused by vibration, after the BDU module 4 is installed and connected to the BDU bracket plate 3, a layer of foam elastic buffer pad 6 is added to the top of the BDU module 4. After being placed in the box, it serves as a partition between the module and the top cover, limiting movement and providing vibration damping.

[0040] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility belongs. The terms “first,” “second,” and similar terms used in this utility 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. “Above,” “below,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0041] The above description is only an optional embodiment of this utility model and is not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A BDU fixing structure, characterized in that, include: The battery cell frame (1), the ridge support arm (2), and the BDU bracket plate (3) are all included. The cell frame (1) includes an end wall (11) disposed on one side of the cell stacking direction. The ridge support arm (2) is arranged horizontally and one end is fixedly connected to the top of the end wall (11). Multiple ridge support arms (2) are provided and are evenly spaced along the extension direction of the end wall (11). The BDU bracket plate (3) is horizontally disposed above the multiple ridge support arms (2) and is fixedly connected to the ridge support arms (2).

2. The BDU fixing structure according to claim 1, characterized in that, The BDU bracket plate (3) is detachably connected to the spur support arm (2).

3. The BDU fixing structure according to claim 1, characterized in that, The spur support arm (2) is provided with a positioning nut (21), and the BDU bracket plate (3) is provided with a first screw hole (31) that matches the positioning nut (21).

4. A BDU fixing structure according to claim 3, characterized in that, The top of the spur support arm (2) is provided with a support block (22), and the positioning nut (21) is embedded in the support block (22).

5. A BDU fixing structure according to claim 4, characterized in that, The support block (22) is detachably connected to the spur support arm (2).

6. A BDU fixing structure according to claim 3, characterized in that, The top of the end wall (11) is provided with a second screw hole (111), and the BDU bracket plate (3) is provided with a third screw hole (32) that matches the second screw hole (111).

7. A BDU fixing structure according to claim 6, characterized in that, The BDU bracket plate (3) has a connecting boss (33) on one side of the spur support arm (2) near the first screw hole (31) and the third screw hole (32).

8. A BDU fixing structure according to claim 1, characterized in that, The length of the spur support arm (2) is greater than the width of the BDU bracket plate (3) in the direction perpendicular to the end wall (11).

9. A battery module, comprising the BDU fixing structure as described in any one of claims 1 to 8, characterized in that, It also includes a BDU module (4) and multiple cell modules (5). The BDU module (4) is mounted on the BDU bracket plate (3). The cell module (5) includes multiple individual cells (51) arranged in sequence. The multiple cell modules (5) are arranged side by side on the cell frame (1). The dragon spine support arm (2) is fixedly set on the shoulder of the individual cell (51) in two adjacent cell modules (5).

10. The battery module according to claim 9, characterized in that, It also includes an elastic cushioning pad (6) disposed on top of the BDU module (4).

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