Fixing device, battery management system assembly and battery pack

Abstract

The utility model relates to the technical field of battery packs, and discloses a fixing device, a battery management system assembly and a battery pack, the fixing device comprises a first support assembly, a second support assembly, a third support assembly and a fourth support assembly, the first support assembly is provided with a transversely arranged first bearing plate, and the second support assembly is located below the first support assembly and detachably connected with the first support assembly; the first support assembly and the second support assembly are of a split type structure, meanwhile, the upper side and the lower side of the first bearing plate and the upper side and the lower side of the second bearing plate are not provided with shielding objects, an operator can rapidly install plate body parts, and the plate body parts of the battery management system assembly can be installed in a partitioned mode when assembled. When the battery management system assembly is assembled, the corresponding plate bodies are mounted in the mounting positions on the upper side and the lower side of the first bearing plate to form the first plate body units, the corresponding plate bodies are mounted in the mounting positions of the second bearing plate to form the second plate body units, and then the first plate body units and the second plate body units are assembled and connected, so that the complete plate body units of the battery management system assembly can be formed; and the installation convenience and flexibility of the plate body are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery packs, and in particular to a fixing device, a battery management system component and a battery pack. Background Art

[0002] As the demand for lightweight battery packs continues to increase, the battery pack needs to continuously reduce the space occupied by the entire pack. As the volume of the battery pack is reduced, the internal layout space of the battery pack will also be compressed. In order to avoid affecting the normal operation of the electrical components inside the battery pack, the layout of the electrical components needs to be further designed to improve the utilization of the internal space of the battery pack. The battery management system of the battery pack is referred to as BMS (Battery Management System). BMS can intelligently manage and maintain each battery unit and monitor the status of the battery. It is an important electrical component inside the battery pack.

[0003] At present, the BMS inside the battery pack usually includes multiple plates. In order to ensure stable and reliable operation of the BMS, the plates of the BMS are usually stacked and placed flat in the battery pack through a mounting frame. A plurality of bearing plates of different horizontal heights are arranged at intervals on the integrated mounting frame. Each plate is fixedly mounted on the corresponding bearing plate through a connector. Although this form of BMS arrangement can realize the flat placement of the plates, when the BMS plates are installed, the corresponding bearing plates above the plates will block the connection positions of the plates, making it impossible for operators to quickly install the plates, making the assembly process of the plates time-consuming and laborious. Utility Model Content

[0004] In view of this, the utility model provides a fixing device, a battery management system component and a battery pack to solve the problem that the existing BMS mounting frame is difficult to install the BMS board.

[0005] In a first aspect, the utility model provides a fixing device for installing a board body portion of a battery management system component, comprising: a first bracket assembly having a transversely arranged first supporting plate, upper and lower sides of the first supporting plate respectively forming mounting positions for a first board body and a second board body for mounting the board body portion; a second bracket assembly, located below the first bracket assembly and detachably connected to the first bracket assembly, the second bracket assembly having a transversely arranged second supporting plate, one of the upper and lower sides of the second supporting plate forming a mounting position for a third board body for mounting the board body portion, and the first bracket assembly being suitable for being detachably connected to a box body of a battery pack through the second bracket assembly.

[0006] The first bracket assembly and the second bracket assembly are split structures, and both have a bearing plate on which the plate body can be installed. There are no obstructions on the upper and lower sides of the first bearing plate and the second bearing plate, so the operator can quickly and reliably install the plate body. At the same time, the BMS plate body can be installed in blocks during assembly. First, the corresponding first plate body and second plate body are installed in the installation positions on the upper and lower sides of the first bearing plate to form a first plate body unit, and then the corresponding third plate body is installed in the installation position of the second bearing plate to form a second plate body unit. At this time, the first plate body unit and the second plate body unit are assembled and connected to form a complete BMS plate body unit. The simple and reliable structure effectively improves the installation convenience and flexibility of the plate body, and effectively solves the problem that the existing BMS mounting frame is difficult to install the BMS plate body.

[0007] In an optional embodiment, the first bracket assembly includes a first mounting bracket arranged in a pair, and the second bracket assembly includes a second mounting bracket arranged in a pair, the first mounting bracket has a first bearing plate, and the second mounting bracket has a second bearing plate. The first mounting bracket can be detachably connected to the ends of the first plate body and the second plate body through its own first bearing plate, and the second mounting bracket can be detachably connected to the end of the third plate body through its own second bearing plate. The first bracket assembly and the second bracket assembly are both split structures, which meet the plate installation requirements while being lighter in weight and easier to process and manufacture.

[0008] In an optional embodiment, the first mounting bracket also has a first support plate and a first connecting plate, the first support plate is arranged vertically, the upper end of the first support plate is connected to the first bearing plate and the lower end is connected to the first connecting plate, the second mounting bracket also has a second support plate and a second connecting plate, the second support plate is arranged vertically, the upper end of the second support plate is connected to the second bearing plate and the lower end is connected to the second connecting plate, the first connecting plate is assembled and connected to the corresponding second bearing plate, the second connecting plate is suitable for assembly and connection with the box body, the structure is simple and reliable, and it is easy to process and manufacture.

[0009] In an optional embodiment, at least one first mounting bracket also includes a first reinforcing plate, which is respectively connected to the first support plate and the first connecting plate to form a support, and at least one second mounting bracket also includes a second reinforcing plate, which is respectively connected to the second support plate and the second connecting plate to form a support. The corresponding reinforcing plates on the first mounting bracket and the second mounting bracket can effectively enhance the overall structural stability of the bracket, ensure the reliability and stability of the plate installation, and effectively prevent the bracket body from bending or breaking during bumps or vibrations.

[0010] In an optional embodiment, connecting holes are provided on the first connecting plate and the second connecting plate, the first reinforcing plate and the second reinforcing plate are obliquely arranged, and avoidance holes are provided at positions where the first reinforcing plate and the second reinforcing plate are vertically opposite to the connecting holes, and / or, at least one second mounting bracket also includes a third reinforcing plate, and the third reinforcing plate is respectively connected to the second bearing plate and the second support plate. This form of first reinforcing plate and second reinforcing plate can form a triangular structure on the corresponding first mounting bracket and second mounting bracket, respectively, and the support form is more stable and reliable. Since the second mounting bracket will bear the weight of all plates and brackets, the provision of the third reinforcing plate can further enhance the structural stability of the second mounting bracket.

[0011] In an optional embodiment, studs are provided at the mounting positions of the first bearing plate and the second bearing plate, and the plate body can be directly sleeved on the studs through its own connecting holes and then directly connected through nuts, which facilitates positioning during the installation process. At the same time, the connection method is also simpler, which can reduce the assembly burden of the operator.

[0012] In an optional embodiment, the fixing device also includes a wiring harness bracket, which is detachably arranged on the first supporting plate or the second supporting plate. The wiring harness bracket is arranged in a one-to-one correspondence with the plug-in ends of the first plate body, the second plate body, and the third plate body, so as to facilitate restraining the wiring harness plugged in on the fixed plate body and preventing the wiring harness from swinging at will.

[0013] In the second aspect, the utility model also provides a battery management system component, which includes: the above-mentioned fixing device; a board body, including a main board, a first slave board and a second slave board, the first board body, the second board body and the third board body are the main board, the first slave board and the second slave board respectively; the first board body is installed at the installation position on the upper side of the first supporting plate of the fixing device, the second board body is installed at the installation position on the lower side of the first supporting plate, and the third board body is installed at the installation position on the second supporting plate of the fixing device.

[0014] In an optional embodiment, the plug-in end of the first plate body is arranged in the same direction as the plug-in end of the third plate body, and the plug-in end of the first plate body is arranged in the opposite direction to the plug-in end of the second plate body. The plug-in ends of each plate body are arranged in this form, which can effectively avoid the problem of interference between the wiring harness plugs when the plug-in ends between adjacent plate bodies are arranged in the same direction, and can ensure that the corresponding wiring harnesses can still be stably plugged in when the interval between adjacent plate bodies is small.

[0015] In a third aspect, the utility model further provides a battery pack, which includes: the above-mentioned fixing device, or the above-mentioned battery management system component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A three-dimensional schematic diagram of a fixing device and a plate body assembled from a first viewing angle according to an embodiment of the utility model;

[0018] Figure 2 for Figure 1 A three-dimensional schematic diagram of a second viewing angle of the fixing device shown;

[0019] Figure 3 for Figure 1 a front view of the fixture shown;

[0020] Figure 4 for Figure 1 An exploded schematic diagram of a first mounting bracket and a second mounting bracket of the fixing device shown;

[0021] Figure 5 for Figure 4 A three-dimensional schematic diagram of the first mounting bracket is shown.

[0022] Description of reference numerals:

[0023] 1. First mounting bracket; 101. First bearing plate; 102. First supporting plate; 103. First connecting plate; 104. First reinforcing plate;

[0024] 2. Second mounting bracket; 201. Second bearing plate; 202. Second supporting plate; 203. Second connecting plate; 204. Second reinforcing plate; 205. Third reinforcing plate;

[0025] 3. Connection hole; 4. Avoidance hole; 5. Stud; 6. Wire harness bracket; 7. Board body; 701. Main board; 702. First slave board; 703. Second slave board; 8. Fastening component. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0027] Combine the following Figures 1 to 5 , describing an embodiment of the utility model.

[0028] In the related art, a BMS usually has three plate bodies, each of which is placed horizontally, and two of the three plate bodies are arranged in sequence along the vertical direction through a mounting frame. The mounting frame has an F-shaped structure with two mounting plates, which are arranged vertically at intervals. The two plate bodies are respectively installed on corresponding mounting plates. Since the BMS plate bodies are usually compactly arranged, the distance between the two mounting plates of the mounting frame is relatively close. At the same time, the gap between the two horizontal ends of the plate body and the main body of the mounting frame is also narrow. When the plate body is connected to the mounting plate by bolts, not only is it difficult to put the bolts into the corresponding connecting holes, but also due to the obstruction of the upper mounting plate, it is difficult to tighten the bolts on the lower mounting plate using tools, which makes it impossible for the operator to perform the installation process normally.

[0029] According to an embodiment of the utility model, on the one hand, a fixing device is provided for installing a board body portion 7 of a battery management system component, the fixing device comprising: a first bracket assembly and a second bracket assembly, the first bracket assembly having a first horizontally arranged first supporting plate 101, the upper and lower sides of the first supporting plate 101 respectively forming mounting positions for mounting the first board body and the second board body of the board body portion 7, the second bracket assembly being located below the first bracket assembly and being detachably connected to the first bracket assembly, the second bracket assembly having a second horizontally arranged second supporting plate 201, one of the upper and lower sides of the second supporting plate 201 forming a mounting position for mounting the third board body of the board body portion 7, and the first bracket assembly being suitable for being detachably connected to the box body of the battery pack through the second bracket assembly.

[0030] In the fixing device of the present embodiment, the first bracket assembly and the second bracket assembly are split structures, and both have a bearing plate capable of mounting a plate body. There are no obstructions on the upper and lower sides of the first bearing plate 101 and the second bearing plate 201, so the operator can quickly and reliably mount the plate body. At the same time, the plate body of the BMS can be installed in blocks during assembly. First, the corresponding first plate body and the second plate body are installed in the mounting positions on the upper and lower sides of the first bearing plate 101 to form a first plate body unit, and then the corresponding third plate body is installed in the mounting position of the second bearing plate 201 to form a second plate body unit. At this time, the first plate body unit and the second plate body unit are assembled and connected to form a complete BMS plate body unit. The simple and reliable structure effectively improves the installation convenience and flexibility of the plate body, and effectively solves the problem that the BMS plate body is difficult to install on the mounting frame of the existing BMS.

[0031] It should be noted that, in this embodiment, the horizontal direction refers to Figure 1 The middle arrow points to "horizontal", and the vertical direction refers to Figure 1 The "vertical direction" indicated by the middle arrow refers to Figure 1The arrow in the middle points to the "vertical" direction.

[0032] In the related art, the F-type mounting frame can only install two plates, and the third plate at the bottom can only be installed on the box of the battery pack, and cannot form an integral structure with the two plates. Moreover, this form of plate arrangement can only be set tightly against the box of the battery pack and cannot flexibly avoid surrounding components.

[0033] In the fixing device of the present embodiment, since the upper and lower sides of the first supporting plate 101 can be used to install the plate bodies, the three plate bodies can be supported and installed by combining the first bracket assembly and the second bracket assembly. The positions of the three plate bodies can be flexibly adjusted by changing the fulcrum height and position of the second bracket assembly, which not only allows the three plate bodies to form a whole, but also allows for more flexible avoidance of surrounding components, thereby providing convenience for the arrangement of internal components of the battery pack.

[0034] In addition, it should be noted that there is no limitation on the number of plates installed on the fixing device, and it can be two, three, four or more; for the installation position of the first supporting plate 101, whether to install the plate can be determined according to the number of plates; there is no limitation on the specific position of the installation position of the second supporting plate 201. If the number of plates is four, installation positions can be formed on both the upper and lower sides of the second supporting plate 201; for plates of more than four, the number of bracket assemblies can be increased accordingly, that is, the fixing device can further include a third bracket assembly, which is all within the protection scope of the present application.

[0035] Specifically, Figure 3 As shown, the accompanying drawings only show the situation where the mounting position is formed on the upper side of the second carrier plate 201. If necessary, the second carrier plate 201 can also be arranged close to the plate body below the first carrier plate 101, and the corresponding plate body can be installed on the lower side of the second carrier plate 201.

[0036] Furthermore, there is no limitation on the structural forms of the first bracket assembly and the second bracket assembly. The first bracket assembly and the second bracket assembly can each be an integrated frame or a split frame, which can be flexibly selected according to needs.

[0037] In this embodiment, the first bracket assembly includes a first mounting bracket 1 arranged in a pair, and the second bracket assembly includes a second mounting bracket 2 arranged in a pair. The first mounting bracket 1 has a first bearing plate 101, and the second mounting bracket 2 has a second bearing plate 201. The first mounting bracket 1 can be detachably connected to the ends of the first plate body and the second plate body through its own first bearing plate 101, and the second mounting bracket 2 can be detachably connected to the third plate body through its own second bearing plate 201. The first bracket assembly and the second bracket assembly are both split structures, which meet the plate installation requirements while being lighter in weight and easier to process and manufacture.

[0038] It should be noted that the end of the plate refers to Figure 1 The arrows in the middle point to the two ends in the "horizontal" direction.

[0039] In this embodiment, the first mounting bracket 1 also has a first support plate 102 and a first connecting plate 103. The first support plate 102 is arranged vertically, and the upper end of the first support plate 102 is connected to the first bearing plate 101 and the lower end is connected to the first connecting plate 103. The second mounting bracket 2 also has a second support plate 202 and a second connecting plate 203. The second support plate 202 is arranged vertically, and the upper end of the second support plate 202 is connected to the second bearing plate 201 and the lower end is connected to the second connecting plate 203. The first connecting plate 103 is assembled and connected with the corresponding second bearing plate 201, and the second connecting plate 203 is suitable for being assembled and connected with the box body. The structure is simple and reliable, and it is easy to process and manufacture.

[0040] Specifically, there is no limitation on the number of the first support plate 102 and the second support plate 202, and the corresponding number can be set according to the support strength requirement, which can be one, two, three or more;

[0041] Furthermore, if Figure 3 As shown, the structures of the two second mounting brackets 2 may not be exactly the same, wherein one second mounting bracket 2 has one second support plate 202, and the other second mounting bracket 2 has two second support plates 202. This is the result of matching according to the styling requirements, support requirements, and the arrangement requirements of avoiding surrounding components, and is not strictly limited, and the number and connection positions of the support plates and connecting plates can be flexibly changed.

[0042] In this embodiment, at least one first mounting bracket 1 also includes a first reinforcing plate 104, which is respectively connected to the first support plate 102 and the first connecting plate 103 to form a support, and at least one second mounting bracket 2 also includes a second reinforcing plate 204, which is respectively connected to the second support plate 202 and the second connecting plate 203 to form a support. The corresponding reinforcing plates on the first mounting bracket 1 and the second mounting bracket 2 can effectively enhance the overall structural stability of the bracket, ensure the reliability and stability of the plate installation, and effectively prevent the bracket body from bending or breaking during bumps or vibrations.

[0043] Among them, it should be noted that since the number of the first mounting bracket 1 and the second mounting bracket 2 are both two, there is no strict limitation on which bracket the reinforcement plate is located on. Reinforcement plates can be provided on both mounting brackets, or on one of the paired mounting brackets. The selection can be flexibly based on strength requirements and styling requirements.

[0044] Specifically, Figure 3 As shown, the structures of the two first mounting brackets 1 may not be completely the same, wherein one of the first mounting brackets 1 is provided with a first reinforcing plate 104, while the other first mounting bracket 1 is not provided with the first reinforcing plate 104, which is the result of the corresponding matching according to the support strength requirements of the first mounting bracket 1 and the avoidance requirements for surrounding components.

[0045] In this embodiment, connecting holes 3 are provided on the first connecting plate 103 and the second connecting plate 203, the first reinforcing plate 104 and the second reinforcing plate 204 are obliquely arranged, and avoidance holes 4 are provided at positions of the first reinforcing plate 104 and the second reinforcing plate 204 that are vertically opposite to the connecting holes 3. The first reinforcing plate 104 and the second reinforcing plate 204 in this form can form a triangular structure on the corresponding first mounting bracket 1 and the second mounting bracket 2, respectively, and the supporting form is more stable and reliable. At the same time, the avoidance holes 4 are provided at the positions of the reinforcing plates corresponding to the connecting holes 3, which can prevent the reinforcing plates from interfering with the normal installation of the connecting plates, and facilitate the insertion or assembly of the connecting parts.

[0046] It can be understood that, as a replaceable embodiment, the first reinforcing plate 104 and the second reinforcing plate 204 can also be vertically connected to the corresponding support plates to form support ribs. In order to improve the support strength, the number of the first reinforcing plates 104 and the second reinforcing plates 204 can be multiple, and there is no need to set the avoidance holes 4 accordingly. It is only necessary to avoid the position of the connection hole 3 when connecting.

[0047] Specifically, there is no limitation on the number of the connection holes 3 , and the number may be one, two, three or more, etc., and may be flexibly selected according to the requirements.

[0048] Furthermore, the connection holes 3 on the second connection plate 203 are used for the fastening components 8 to pass through, and the connection holes 3 on the first connection plate 103 are used for cooperation with the connection structure on the second supporting plate 201 to pass through.

[0049] In this embodiment, at least one second mounting bracket 2 also includes a third reinforcing plate 205, which is respectively connected to the second loading plate 201 and the second support plate 202. Since the second mounting bracket 2 will bear the weight of all plates and brackets, the provision of the third reinforcing plate 205 can further enhance the structural stability of the second mounting bracket 2.

[0050] In this embodiment, studs 5 are provided at the mounting positions of the first carrier plate 101 and the second carrier plate 201. The plate body can be directly sleeved on the studs 5 through its own connecting holes and then directly connected through nuts, which is convenient for positioning during the installation process. At the same time, the connection method is also simpler, which can reduce the assembly burden of the operator.

[0051] Specifically, compared with setting through holes on the first carrier plate 101 and the second carrier plate 201 and connecting the plates through fastening components, setting studs 5 at the corresponding mounting positions of the carrier plates can effectively avoid the problem of through hole interference, and can enable the plates on the upper and lower sides of the same carrier plate to be installed at any position without avoiding or misaligning operations, thereby improving the flexibility of the plate connection.

[0052] In this embodiment, the fixing device further includes a harness bracket 6, which is detachably arranged on the first carrier plate 101 or the second carrier plate 201, and the harness bracket 6 is arranged one-to-one with the plug-in terminal in the plate body 7. The harness bracket 6 is used to fix the harness, so as to constrain the harness plugged in the plate body and prevent the harness from swinging at will. In this embodiment, there is no restriction on the number and specific position of the harness bracket 6, which is specifically the same as the number of the plug-in terminals in the plate body 7, and can be set accordingly according to the number and position of the plug-in terminals.

[0053] Specifically, the wiring harness bracket 6 is also connected via the stud 5 , and a through hole for the stud 5 to pass through is correspondingly provided on the wiring harness bracket 6 .

[0054] According to an embodiment of the utility model, on the other hand, a battery management system component is provided, which includes: the above-mentioned fixing device and a board body portion, the board body portion 7 includes a main board 701, a first slave board 702 and a second slave board 703, the first board body, the second board body and the third board body are respectively the main board 701, the first slave board 702 and the second slave board 703, the first board body is installed at the installation position on the upper side of the first supporting plate 101 of the fixing device, the second board body is installed at the installation position on the lower side of the first supporting plate 101, and the third board body is installed at the installation position on the second supporting plate 201 of the fixing device.

[0055] It should be noted that the various boards in the board body 7 are specific types of the first board body, the second board body, and the third board body mentioned above; the specific installation positions and installation sequences of the main board 701, the first slave board 702, and the second slave board 703 can be flexibly changed according to needs and are not limited to Figure 1 The installation order shown, i.e., "the first board, the second board, and the third board are respectively the main board 701, the first slave board 702, and the second slave board 703", does not mean that the first board is the main board 701, the second board is the first slave board 702, and the third board is the second slave board 703; taking the main board 701 as an example, the main board 701 can be used as the first board, the second board, or the third board. In other words, Figure 1In the figure, the first board is the main board 701, the second board is the first slave board 702, and the third board is the second slave board 703; however, the first board can also be the second slave board 703, the second board can be the main board 701, and the third board can be the first slave board 702. This is not limited here, and different combinations of installation positions and installation sequences are all within the protection scope of this application.

[0056] Specifically, Figure 3 As shown, the second slave plate 703 is installed at the installation position on the upper side of the second carrier plate 201. At this time, a layout space for installing other components inside the battery pack can be formed below the second carrier plate 201, which can improve the layout flexibility of the internal components of the battery pack.

[0057] In this embodiment, the plug-in end of the first plate body and the plug-in end of the third plate body are arranged in the same direction, and the plug-in end of the first plate body and the plug-in end of the second plate body are arranged in the opposite direction. Figure 1 and Figure 2 The plug-in end of the main board 701 is arranged in the same direction as the plug-in end of the second slave board 703, and the plug-in end of the main board 701 is arranged in the opposite direction to the plug-in end of the first slave board 702. The plug-in ends of each board are arranged in this way, which can effectively avoid the problem of interference between the wiring harness plugs when the plug-in ends of adjacent boards are arranged in the same direction, and can ensure that the corresponding wiring harnesses can be stably plugged in when the interval between adjacent boards is small.

[0058] According to an embodiment of the present invention, in another aspect, a battery pack is provided, which includes: the above-mentioned fixing device, or the above-mentioned battery management system component.

[0059] In this embodiment, the battery pack also includes other necessary components such as a battery cell unit, a shell, an expansion beam, and a control assembly.

[0060] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A fixing device for mounting a plate body (7) of a battery management system component, characterized in that: include: A first bracket assembly comprises a first bearing plate (101) arranged transversely, wherein upper and lower sides of the first bearing plate (101) respectively form mounting positions for mounting a first plate body and a second plate body of the plate body portion (7); The second bracket assembly is located below the first bracket assembly and is detachably connected to the first bracket assembly. The second bracket assembly has a second carrier plate (201) arranged transversely. One of the upper and lower sides of the second carrier plate (201) forms a mounting position for a third plate body for mounting the plate body (7). The first bracket assembly is suitable for being detachably connected to the box body of the battery pack through the second bracket assembly.

2. The fixing device according to claim 1, characterized in that: The first bracket assembly comprises a first mounting bracket (1) arranged in a pair, and the second bracket assembly comprises a second mounting bracket (2) arranged in a pair, the first mounting bracket (1) having the first bearing plate (101), and the second mounting bracket (2) having the second bearing plate (201), the first mounting bracket (1) being detachably connected to the ends of the first plate body and the second plate body via its own first bearing plate (101), and the second mounting bracket (2) being detachably connected to the end of the third plate body via its own second bearing plate (201).

3. The fixing device according to claim 2, characterized in that: The first mounting bracket (1) further comprises a first supporting plate (102) and a first connecting plate (103); the first supporting plate (102) is arranged in a vertical direction; the upper end of the first supporting plate (102) is connected to the first bearing plate (101) and the lower end is connected to the first connecting plate (103); the second mounting bracket (2) further comprises a second supporting plate (202) and a second connecting plate (203); the second supporting plate (202) is arranged in a vertical direction; the upper end of the second supporting plate (202) is connected to the second bearing plate (201) and the lower end is connected to the second connecting plate (203); the first connecting plate (103) is assembled and connected to the corresponding second bearing plate (201); and the second connecting plate (203) is suitable for being assembled and connected to the box body.

4. The fixing device according to claim 3, characterized in that: At least one of the first mounting brackets (1) further comprises a first reinforcing plate (104), wherein the first reinforcing plate (104) is respectively connected to the first supporting plate (102) and the first connecting plate (103) to form a support, and at least one of the second mounting brackets (2) further comprises a second reinforcing plate (204), wherein the second reinforcing plate (204) is respectively connected to the second supporting plate (202) and the second connecting plate (203) to form a support.

5. The fixing device according to claim 4, characterized in that: The first connecting plate (103) and the second connecting plate (203) are provided with connecting holes (3); the first reinforcing plate (104) and the second reinforcing plate (204) are arranged obliquely; and avoidance holes (4) are arranged at positions of the first reinforcing plate (104) and the second reinforcing plate (204) that are vertically opposite to the connecting holes (3); And / or, at least one of the second mounting brackets (2) further comprises a third reinforcing plate (205), wherein the third reinforcing plate (205) is respectively connected to the second bearing plate (201) and the second supporting plate (202).

6. The fixing device according to any one of claims 1 to 5, characterized in that: The mounting positions of the first bearing plate (101) and the second bearing plate (201) are provided with studs (5).

7. The fixing device according to any one of claims 1 to 5, characterized in that: The fixing device also includes a wiring harness bracket (6), which is detachably arranged on the first supporting plate (101) or the second supporting plate (201), and the wiring harness bracket (6) is arranged in a one-to-one correspondence with the plug-in end in the plate body (7).

8. A battery management system component, characterized in that: include: The fixing device according to any one of claims 1 to 7; The plate body (7) comprises a main plate (701), a first slave plate (702) and a second slave plate (703); the first plate body, the second plate body and the third plate body are respectively the main plate (701), the first slave plate (702) and the second slave plate (703); the first plate body is installed at the installation position on the upper side of the first supporting plate (101) of the fixing device, the second plate body is installed at the installation position on the lower side of the first supporting plate (101), and the third plate body is installed at the installation position on the second supporting plate (201) of the fixing device.

9. The battery management system component according to claim 8, characterized in that: The plug-in end of the first plate body is arranged in the same direction as the plug-in end of the third plate body, and the plug-in end of the first plate body is arranged in the opposite direction to the plug-in end of the second plate body.

10. A battery pack, characterized in that: include: The fixing device according to any one of claims 1 to 7, or the battery management system component according to claim 8 or 9.

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