Quick-change BMU connecting structure and battery pack

Abstract

This utility model proposes a quick-change BMU connection structure and battery pack, relating to the field of battery technology. The quick-change BMU connection structure includes a first connector and a second connector. Two first connectors are symmetrically arranged and fixedly disposed on opposite sides inside the mounting hole, and each first connector has a snap-fit ​​hole. Two second connectors are symmetrically arranged and used for fixed connection with opposite sides of the BMU, and each second connector has a snap-fit ​​portion that mates with the snap-fit ​​hole. The snap-fit ​​portion and / or the first connector are made of an elastic material, capable of elastic deformation when the snap-fit ​​portion is inserted into the snap-fit ​​hole to achieve snap-fit ​​fixation, and deforming again under external force to achieve disassembly. By setting the first connector and the second connector, the two connectors cooperate to achieve tool-free quick insertion and removal installation and reliable snap-fit ​​fixation of the BMU, solving the technical problems of cumbersome operation, low efficiency, and high risk of parts falling off in confined spaces inherent in traditional bolt connection methods.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a quick-swap BMU connection structure and battery pack. Background Technology

[0002] In the current energy storage technology field, with the continuous improvement of battery system safety requirements, energy storage boxes need to integrate more functional units, such as high and low voltage connectors, manual maintenance switches (MSDs), explosion-proof valves, and fire detection interfaces, leading to increasingly tight internal space. Especially in typical energy storage box structures represented by "1P104S", the battery management unit (BMU) is usually responsible for the voltage and temperature acquisition functions of multiple battery modules, and its layout directly affects the reliability, maintainability, and compatibility of the overall structure.

[0003] Currently, most battery control units (BMUs) in the industry are fixed inside the battery pack using bolts and metal brackets, with a maintenance port on the battery pack service panel for later replacement. While this method meets the installation requirements of BMUs to some extent, it still has significant drawbacks. Because the BMU is usually installed near the front electrical area in a confined space, it is extremely inconvenient for operators to tighten or loosen bolts. This not only results in low work efficiency but also poses a risk of bolts falling into the battery pack, potentially causing short circuits and other safety hazards.

[0004] Furthermore, in actual projects, BMUs often come from multiple suppliers, and their dimensions and mounting hole positions vary. The existing bolt-and-bracket fixing method lacks the necessary dimensional adaptability, making it difficult for different BMU models to share the same mounting structure. Custom brackets must be customized for different suppliers, increasing design, material, and maintenance costs, and reducing the overall versatility and economy of the structure. Utility Model Content

[0005] In view of this, this utility model proposes a quick-change BMU connection structure and battery pack to solve the technical problem of cumbersome BMU disassembly process and difficult operation caused by the use of bolt fixing in the prior art.

[0006] The technical solution of this utility model is implemented as follows: In the first aspect, this utility model provides a quick-change BMU connection structure for installing the BMU inside the mounting hole of the battery pack maintenance panel, including a first connector and a second connector; Two first connectors are symmetrically arranged and fixedly installed on opposite sides inside the mounting hole. The first connectors are provided with snap-fit ​​holes. Two second connectors are symmetrically arranged for fixed connection with opposite sides of the BMU. The second connector has a snap-fit ​​part that mates with the snap-fit ​​hole. The snap-fit ​​portion and / or the first connector are made of an elastic material, which can undergo elastic deformation when the snap-fit ​​portion is inserted into the snap-fit ​​hole to achieve snap-fit ​​fixation, and deform again under the action of external force to achieve disassembly.

[0007] Based on the above technical solution, preferably, the first connector is a structure integrally formed on the inner side of the battery pack maintenance panel. The first connector includes a first connecting plate, which is vertically and fixedly connected to the inner edge of the mounting hole, and the snap-fit ​​hole is opened on the first connecting plate.

[0008] Based on the above technical solution, preferably, the second connector has an L-shaped structure, including an interconnected mounting plate and a second connecting plate. The mounting plate is used for fixed connection with the BMU, and the second connecting plate is provided with a snap-fit ​​part for engaging with the snap-fit ​​hole.

[0009] Based on the above technical solution, preferably, the second connecting plate has a notch at the end away from the mounting plate, and an elastic plate is fixedly provided on the inner end face of the notch in a direction perpendicular to the mounting plate, and the snap-fit ​​part is fixedly provided on the outer side of the elastic plate.

[0010] Based on the above technical solution, preferably, the plane where the outer surface of the elastic plate is located is recessed into the plane where the outer surface of the second connecting plate is located.

[0011] Based on the above technical solution, preferably, the second connecting plate has guide grooves arranged vertically and horizontally on its outer side, and the side wall of the first connecting plate has guide parts that cooperate with the guide grooves.

[0012] Based on the above technical solution, preferably, the free end of the elastic plate has a disassembly portion that is inclined toward the inside of the second connecting plate.

[0013] Based on the above technical solution, preferably, the mounting plate has multiple fixing holes, and the layout of the multiple fixing holes can be adapted to fix and connect BMUs of different models and sizes.

[0014] Based on the above technical solution, preferably, the first connector further includes a reinforcing rib, which is fixedly disposed at the connection between the first connecting plate and the battery pack maintenance panel.

[0015] Secondly, this utility model also discloses a battery pack, including a housing, a battery pack maintenance panel disposed on the front side of the housing, and a BMU, and also includes the quick-change BMU connection structure described in the first aspect, wherein the BMU is installed inside the mounting hole of the battery pack maintenance panel through the quick-change BMU connection structure.

[0016] The present invention has the following advantages over the prior art: (1) The quick-change BMU connection structure disclosed in this utility model establishes an installation foundation through a first connector symmetrically arranged inside the mounting holes of the battery pack maintenance panel, and is equipped with a second connector with an elastic snap-fit ​​part that is fixed to the BMU. The two connectors cooperate with each other to realize tool-free quick plug-in and plug-out installation and reliable snap-fit ​​fixation of the BMU. This solves the technical problems of cumbersome operation, low efficiency and high risk of parts falling off in the traditional bolt connection method in a narrow space, and provides a safe and efficient solution for the maintenance of BMU of energy storage equipment.

[0017] (2) By setting the guide part and the guide groove to cooperate, precise linear motion constraints can be generated to ensure that the snap-fit ​​part and the snap-fit ​​hole always maintain axial alignment. Thus, during the horizontal insertion process, the snap-fit ​​part and the snap-fit ​​hole can be accurately cooperated. At the same time, the guide part provides the load of the second connector and the BMU as a whole in the vertical direction in the guide groove, ensuring the structural stability of the second connector and the first connector after installation, and improving the load-bearing capacity and vibration resistance.

[0018] (3) By setting a notch at the end of the second connecting plate and fixing an independent elastic plate, during disassembly, an external force acts on the outer side of the elastic plate to induce reverse deformation, causing the snap-fit ​​part to disengage from the snap-fit ​​hole and complete the separation. Throughout the process, the main body of the second connecting plate remains in a rigid support state, and only the elastic plate participates in the deformation movement. The deformation of the elastic plate can be achieved with a smaller operating force, making the disassembly operation more labor-saving. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the quick-change BMU connection structure disclosed in this utility model without the BMU installed. Figure 2 This is a first-view structural diagram of the quick-change BMU connection structure disclosed in this utility model after the BMU is installed. Figure 3 This is a second-view structural diagram of the quick-change BMU connection structure disclosed in this utility model after the BMU is installed. Figure 4 for Figure 3 Enlarged view of a portion of point A in the middle; Figure 5 This is an exploded view of the quick-change BMU connection structure disclosed in this utility model; Figure 6 This is a three-dimensional structural diagram of the second connector disclosed in this utility model; Figure 7 This is a three-dimensional structural diagram of the battery pack disclosed in this utility model; Figure label: 1. Battery pack maintenance panel; 10. Mounting hole; 2. First connector; 211. Snap-fit ​​hole; 21. First connecting plate; 212. Guide part; 22. Reinforcing rib; 3. Second connector; 31. Mounting plate; 32. Second connecting plate; 320. Snap-fit ​​part; 321. Notch; 322. Elastic plate; 323. Guide groove; 3221. Disassembly part; 311. Fixing hole; 4. BMU; 5. Housing; 6. Individual battery. Detailed Implementation

[0021] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0024] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0025] 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 utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0028] like Figure 1 As shown, combined with Figure 2-6 This utility model embodiment discloses a quick-change BMU connection structure for installing the BMU inside the mounting hole 10 of the battery pack maintenance panel 1, which includes a first connector 2 and a second connector 3.

[0029] The first connector 2 is the basic fixing part of the quick-change BMU connection structure, providing a stable and reliable installation base. Two of these components are symmetrically arranged and fixedly installed on opposite sides inside the mounting hole 10, forming a symmetrical support structure. This layout ensures uniform stress distribution and structural stability. The first connector 2 has a snap-fit ​​hole 211, which is used to form a mating relationship with the snap-fit ​​part 320 of the second connector 3 to achieve mechanical interlocking.

[0030] The second connector 3 is the movable part that directly connects to the BMU, serving the dual functions of connection and force transmission. This component also employs a symmetrical design, with two connectors fixedly connected to opposite sides of the BMU. This layout ensures the balance and stability of the connection. The snap-fit ​​portion 320 on the second connector 3 is a key component that mates with the first connector 2. Its shape and size precisely match the snap-fit ​​hole 211. After the BMU and the two second connectors 3 are connected, the entire assembly passes through the outside of the battery pack maintenance panel 1 into the inside of the mounting hole 10, and engages with the snap-fit ​​hole 211 on the first connector 2 via the snap-fit ​​portion 320 on the second connector 3. This facilitates quick and easy installation of the BMU into the mounting hole 10 of the battery pack maintenance panel 1.

[0031] In order to facilitate the removal of the second connector 3 from the first connector 2, this embodiment limits the snap-fit ​​portion 320 and / or the first connector 2 to be made of an elastic material, which can undergo elastic deformation when the snap-fit ​​portion 320 is inserted into the snap-fit ​​hole 211 to achieve snap-fit ​​fixation, and deform again under the action of external force to achieve removal.

[0032] When the snap-fit ​​part 320 is inserted into the snap-fit ​​hole 211, the elastic material deforms and generates a restoring force. This restoring force forms a preload on the connection, ensuring its reliability. When disassembly is required, external force causes the elastic material to deform again, releasing the connection. The benefits of this mechanism are twofold: first, it completely avoids the risk of bolts falling out in traditional bolted connections, improving operational safety; second, it greatly simplifies the operation process, transforming bolt tightening that requires tools into a simple manual insertion and removal operation.

[0033] The quick-change BMU connection structure disclosed in this utility model establishes an installation foundation through a first connector 2 symmetrically arranged inside the mounting holes 10 of the battery pack maintenance panel 1, and is equipped with a second connector 3 with an elastic snap-fit ​​part 320 that is fixed to the BMU. The two connectors cooperate with each other to realize tool-free quick plug-in and plug-out installation and reliable snap-fit ​​fixation of the BMU. This solves the core technical problems of traditional bolt connection methods in confined spaces, such as cumbersome operation, low efficiency, and high risk of parts falling off, providing a safe and efficient solution for the maintenance of BMUs in energy storage devices.

[0034] In some implementations, the first connector 2 is integrally formed on the inner side of the battery pack maintenance panel 1. This configuration allows for a single injection molding process, creating a seamless continuous body between the first connector 2 and the battery pack maintenance panel 1. This integrally formed structure offers the following technical advantages: First, it significantly improves structural strength and overall rigidity, avoiding the risk of failure due to fatigue or loosening at connection points, thus enhancing product reliability and lifespan. Second, it eliminates the need for additional connection processes and parts (such as solder and bolts), simplifying the production process, reducing manufacturing costs, and improving production efficiency. Third, the integrated structure avoids assembly errors, ensuring the accuracy of the snap-fit ​​hole 211 position on the first connector 2, laying the foundation for precise and rapid snap-fit ​​of the subsequent BMU.

[0035] The first connector 2 includes a first connecting plate 21, which is vertically fixedly connected to the inner edge of the mounting hole 10. A snap-fit ​​hole 211 is formed on the first connecting plate 21. Specifically, the mounting hole 10 is horizontally formed on the battery pack maintenance panel 1, and the first connector 2 is located on both sides of the mounting hole 10 along its length. With this arrangement, the first connecting plate 21 is located at the inner edge of the mounting hole 10, which can smoothly guide the second connector 3 to be horizontally inserted into the mounting hole 10, and achieve snap-fit ​​between the snap-fit ​​part 320 on the second connector 3 and the snap-fit ​​hole 211 on the first connecting plate 21.

[0036] In some embodiments, the second connector 3 has an L-shaped structure, including a mounting plate 31 and a second connecting plate 32 that are connected to each other. The mounting plate 31 is used to fix the connection with the BMU, and the second connecting plate 32 is provided with a snap-fit ​​part 320 for engaging with the snap-fit ​​hole 211.

[0037] In this embodiment, the mounting plate 31 serves as the direct interface with the BMU and undertakes the main fixing function; the second connecting plate 32 serves as a functional extension, providing an installation position and movement space for the snap-fit ​​part 320. The technical advantages of this functional partitioning are: firstly, it realizes modular design, making the force path of the entire connection structure clear, which is convenient for engineering optimization and strength calculation; secondly, it allows different materials and manufacturing processes to be selected according to different functional requirements. For example, the mounting plate 31 needs high rigidity, while the second connecting plate 32 needs a certain degree of elasticity to facilitate elastic snap-fit.

[0038] In this embodiment, both the mounting plate 31 and the second connecting plate 32 are vertically arranged. The side of the mounting plate 31 facing the second connecting plate 32 is used to fix it to the BMU by bolts. The second connecting plate 32 can be engaged with the snap-fit ​​part 320 and the snap-fit ​​hole 211 in the horizontal direction by plugging and unplugging.

[0039] In order to facilitate the precise engagement of the snap-fit ​​part 320 with the snap-fit ​​hole 211 during the horizontal insertion of the second connecting plate 32 into the mounting hole 10, the following technical solution is also provided in this embodiment.

[0040] Specifically, the second connecting plate 32 has guide grooves 323 arranged parallel to each other on its outer side, and the first connecting plate 21 has guide portions 212 on its sidewall that cooperate with the guide grooves 323. In this embodiment, the guide grooves 323 are formed at the end of the second connecting plate 32 near the mounting plate 31 and extend toward the end of the second connecting plate 32 away from the mounting plate 31. However, it is worth noting that the end of the guide grooves 323 away from the mounting plate 31 does not penetrate through the outer side of the second connecting plate 32, which is to form a position stop. The upper and lower sidewalls of the first connecting plate 21 are bent inward to form horizontal flanges, which are the guide portions 212.

[0041] As designed, when the second connector 3 approaches the first connector 2, the guide groove 323, which is parallel to the outside of the second connecting plate 32, first contacts the guide portion 212 on the side wall of the first connecting plate 21, forming a preliminary alignment. As the insertion continues, the guide portion 212 slides along the trajectory of the guide groove 323, generating precise linear motion constraints to ensure that the locking portion 320 and the locking hole 211 always maintain axial alignment, thereby accurately achieving the engagement of the locking portion 320 and the locking hole 211 during horizontal insertion.

[0042] In addition, by setting the guide part 212 and the guide groove 323 to cooperate, after the second connector 3 and the first connector 2 are engaged, the position of the second connector 3 relative to the first connector 2 can be avoided. At the same time, the guide part 212 provides the second connector 3 and the BMU as a whole with the load in the vertical direction in the guide groove 323, ensuring the structural stability of the second connector 3 and the first connector 2 after installation, while improving the load-bearing capacity and vibration resistance.

[0043] In the above embodiment, the snap-fit ​​part 320 is located on the outside of the second connecting plate 32. The second connecting plate 32 can be made into an elastic structure. In this way, the second connecting plate 32 can undergo elastic deformation to achieve the engagement between the snap-fit ​​part 320 and the snap-fit ​​hole 211. However, the second connecting plate 32 has a certain height in the vertical direction, and the second connecting plate 32 needs to bear the vertical load of the BMU, so it must have a certain thickness. As a result, when it is necessary to remove the second connecting member 3 from the first connecting member 2, a large force is required to pry the second connecting plate 32 to deform the second connecting plate 32 towards the mounting plate 31, which will result in laborious and inconvenient operation.

[0044] To address the aforementioned problems, this embodiment provides the following technical solution.

[0045] Specifically, the second connecting plate 32 has a notch 321 at the end away from the mounting plate 31. The notch 321 is located between two guide grooves 323. An elastic plate 322 is fixedly provided on the inner end face of the notch 321 in a direction perpendicular to the mounting plate 31. The snap-fit ​​part 320 is fixedly provided on the outside of the elastic plate 322.

[0046] With this configuration, when the second connector 3 is pushed toward the first connector 2, the guide groove 323 and the guide part 212 cooperate to provide axial constraint. The area of ​​the notch 321 between the two guide grooves 323 first generates stress concentration. The elastic plate 322 fixed to the inner end face of the notch 321 undergoes directional elastic deformation in the direction perpendicular to the mounting plate 31. As the pushing force continues to act, the snap-fit ​​part 320 fixed to the outer side of the elastic plate 322 undergoes radial displacement and is precisely embedded in the snap-fit ​​hole 211 of the first connector 2. The snap-fit ​​is firmly achieved through the deformation recovery force of the elastic plate 322.

[0047] During disassembly, an external force acts on the outer side of the elastic plate 322, causing reverse deformation, which disengages the snap-fit ​​part 320 from the snap-fit ​​hole 211, completing the separation. Throughout the process, the main body of the second connecting plate 32 remains in a rigid support state, with only the elastic plate 322 participating in the deformation movement. A smaller operating force can be used to deform the elastic plate 322, making disassembly easier.

[0048] To ensure that the BMU does not move horizontally between the two first connectors 2 after it is installed between the two first connectors 2 via the second connector 3, the outer side of the second connecting plate 32 needs to be in contact with the inner side of the first connecting plate 21 during the actual assembly process. In this way, the two first connecting plates 21 can constrain the second connector 3 and the BMU assembly in the horizontal direction.

[0049] Considering that if the outer side of the elastic plate 322 is flush with the outer side of the second connecting plate 32, the elastic plate 322 will be in close contact with the inner side of the first connecting plate 21 after the snap-fit ​​part 320 and the snap-fit ​​hole 211 are engaged, it will be inconvenient to perform operations on the free end of the elastic member when disassembly is required, i.e. there is no room for operation.

[0050] Therefore, the solution adopted in this embodiment is to recess the plane containing the outer surface of the elastic plate 322 into the plane containing the outer surface of the second connecting plate 32. Specifically, a certain step difference, such as 1.5mm-2mm, is set between the outer surface of the elastic plate 322 and the outer surface of the second connecting plate 32. In this way, when they are snapped together, there is a gap between the elastic plate 322 and the side wall of the first connecting plate 21, which facilitates the prying of the elastic plate 322 by inserting a tool into the gap.

[0051] In some embodiments, the free end of the elastic plate 322 has a disassembly portion 3221 that is inclined toward the inside of the second connecting plate 32. This configuration allows for direct application of a pushing force to the disassembly portion 3221 when disassembly is required, making the disassembly portion 3221 the point of force application. The force applied to the disassembly portion 3221 causes the entire elastic plate 322 to elastically deform toward the inside of the second connecting plate 32, thus facilitating quick and easy disassembly without the need for auxiliary tools.

[0052] In order to enable the BMU to be fixedly installed on the mounting plate 31, this embodiment provides multiple fixing holes 311 on the mounting plate 31. The layout of the multiple fixing holes 311 can be adapted to the fixed connection of BMUs of different models and sizes.

[0053] Specifically, since the bolt hole spacing on the BMU is fixed, by obtaining the bolt hole spacing of different BMU models, multiple mounting holes 10 can be set on the mounting plate 31. By matching these holes, BMUs of different models and sizes can be fixedly connected, thereby adapting to BMUs from multiple suppliers and achieving stronger compatibility.

[0054] In some embodiments, the first connector 2 further includes a reinforcing rib 22, which is fixedly disposed at the connection between the first connecting plate 21 and the battery pack maintenance panel 1. This arrangement improves the structural strength and rigidity of the connection between the first connector 2 and the battery pack maintenance panel 1, thus meeting the load-bearing capacity requirements of the first connector 2.

[0055] It should be noted that the reinforcing rib 22 can be formed by injection molding together with the first connecting plate 21 and the battery pack maintenance panel 1 in one step.

[0056] This utility model also discloses a battery pack, as shown in the attached drawing. Figure 7 As shown, the device includes a housing 5 and a BMU. Multiple individual batteries 6 are arranged inside the housing 5. A battery pack maintenance panel 1 is provided on the front side of the housing 5. The device also includes the quick-swap BMU connection structure disclosed in the above embodiment. The BMU is installed inside the mounting hole 10 of the battery pack maintenance panel 1 through the quick-swap BMU connection structure.

[0057] This battery pack integrates a quick-change BMU connection structure, using a snap-fit ​​mechanism to replace the traditional bolt connection. This allows the BMU to be quickly inserted and removed without tools from the inside of the mounting hole 10 on the service panel. This not only greatly simplifies the maintenance process and improves operational efficiency, but also completely eliminates the risk of short circuits caused by metal parts falling off, providing a safe, efficient and economical intelligent maintenance solution for the battery pack.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A quick-change BMU connection structure for mounting a BMU inside the mounting hole (10) of a battery pack maintenance panel (1), characterized in that, Includes a first connector (2) and a second connector (3); Two first connectors (2) are symmetrically arranged and fixedly installed on opposite sides inside the mounting hole (10). The first connector (2) is provided with a snap-fit ​​hole (211). There are two symmetrically arranged second connectors (3) for fixed connection with the opposite sides of the BMU. The second connector (3) has a snap-fit ​​part (320) that matches the snap-fit ​​hole (211). The snap-fit ​​portion (320) and / or the first connector (2) are made of elastic material, which can undergo elastic deformation when the snap-fit ​​portion (320) is inserted into the snap-fit ​​hole (211) to achieve snap-fit ​​fixation, and deform again under the action of external force to achieve disassembly.

2. The quick-change BMU connection structure as described in claim 1, characterized in that: The first connector (2) is an integrally formed structure on the inner side of the battery pack maintenance panel (1). The first connector (2) includes a first connecting plate (21). The first connecting plate (21) is vertically fixedly connected to the inner edge of the mounting hole (10). The snap-fit ​​hole (211) is opened on the first connecting plate (21).

3. The quick-change BMU connection structure as described in claim 2, characterized in that: The second connector (3) has an L-shaped structure and includes a mounting plate (31) and a second connecting plate (32) that are connected to each other. The mounting plate (31) is used to fix the connection with the BMU. The second connecting plate (32) is provided with a snap-fit ​​part (320) for engaging with the snap-fit ​​hole (211).

4. The quick-change BMU connection structure as described in claim 3, characterized in that: The second connecting plate (32) has a guide groove (323) arranged parallel to the top and bottom on the outer side, and the first connecting plate (21) has a guide part (212) on the side wall that cooperates with the guide groove (323).

5. The quick-change BMU connection structure as described in claim 4, characterized in that: The second connecting plate (32) has a notch (321) at one end away from the mounting plate (31). The notch (321) is located between two guide grooves (323). An elastic plate (322) is fixedly provided on the inner end face of the notch (321) in a direction perpendicular to the mounting plate (31). The snap-fit ​​part (320) is fixedly provided on the outside of the elastic plate (322).

6. The quick-change BMU connection structure as described in claim 5, characterized in that: The plane containing the outer surface of the elastic plate (322) is recessed into the plane containing the outer surface of the second connecting plate (32).

7. The quick-change BMU connection structure as described in claim 6, characterized in that: The free end of the elastic plate (322) has a disassembly portion (3221) that is inclined toward the inside of the second connecting plate (32).

8. The quick-change BMU connection structure as described in claim 3, characterized in that: The mounting plate (31) has multiple fixing holes (311), and the layout of the multiple fixing holes (311) can be adapted to fix and connect BMUs of different models and sizes.

9. The quick-change BMU connection structure as described in claim 2, characterized in that: The first connector (2) also includes a reinforcing rib (22), which is fixedly disposed at the connection between the first connecting plate (21) and the battery pack maintenance panel (1).

10. A battery pack, comprising a housing (5), a battery pack maintenance panel (1) disposed on the front side of the housing (5), and a BMU, characterized in that, It also includes a quick-swap BMU connection structure as described in any one of claims 1 to 9, wherein the BMU is installed inside the mounting hole (10) of the battery pack maintenance panel (1) via the quick-swap BMU connection structure.

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