Power supply with built-in charger

Abstract

The utility model relates to a power supply with a built-in charger, which comprises a battery module, an upper shell and a bottom shell, a buckle is arranged on the top surface of the upper shell, a limiting plate is arranged at the top of an inner cavity of the upper shell, and a limiting strip is arranged at the joint of the limiting plate and the upper shell. The side, facing the battery module, of the limiting strip is in an arc shape matched with the battery module, the limiting plate divides the upper shell into an element bin and a containing bin, and a support is arranged in the area, corresponding to the containing bin, of the bottom of an inner cavity of the bottom shell. The power source is divided into the element bin and the containing bin for containing the battery module through the limiting plate, space utilization is reasonable, the limiting strips on the limiting plate are matched with the supports to limit the battery module, internal displacement of the battery module is prevented, the protection plate is arranged between the battery module and the side plate of the upper shell to play a buffering role, the anti-seismic performance of the battery module is improved, and the service life of the battery module is prolonged. And the protective sleeve is arranged on the charging and discharging interface, so that silt and water are prevented from entering the shell, and the device is suitable for field operation.

Description

Technical Field

[0001] This utility model relates to a lithium-ion power supply, specifically a power supply with a built-in charger. Background Technology

[0002] During field operations and training, spectrum analyzers are needed to detect and locate interference signals, and to perform high-resolution spectrum measurements and decoding analysis on complex signals (such as pulse signals, transient signals, or modulated signals). To improve ease of use in the field, most spectrum analyzers used in the field are powered by a built-in charger (i.e., a power supply with a built-in charging management circuit), so they can be charged directly without the need for an additional charger.

[0003] Most existing built-in chargers connect multiple batteries to a circuit board, then encapsulate the batteries and circuit board directly within the battery casing. This type of power supply is prone to component displacement during transportation and handling, leading to desoldering and affecting power supply stability, and even disrupting normal operation. Furthermore, the sealing performance of this type of power supply cannot meet the dust and moisture protection requirements for field operations, making it highly susceptible to environmental influences and resulting in unstable performance. Utility Model Content

[0004] The purpose of this invention is to overcome the defects and deficiencies of the above-mentioned background technology and provide a power supply with a built-in charger that can prevent the displacement of its internal components.

[0005] To achieve the above objectives, this utility model provides a power supply with a built-in charger, including a battery module, an upper housing, and a bottom housing. A buckle is provided on the top surface of the upper housing, and a limiting plate is provided at the top of its inner cavity. A limiting strip is provided at the connection between the limiting plate and the upper housing. The limiting strip has an arc shape that adapts to the battery module on the side facing the battery module. The limiting plate divides the upper housing into a component compartment and a placement compartment for the battery module. A charging / discharging interface is provided on the front of the upper housing corresponding to the component compartment. The power supply is equipped with a power switch and an indicator light on one side of the power switch. The charging / discharging interface is connected to a protective sleeve via a connecting strip. A support is provided at the bottom of the inner cavity of the bottom shell corresponding to the area of ​​the placement compartment. A protective plate is provided between the battery module and the upper shell. Mounting holes are provided at the four corners of the top plate of the upper shell. BOSS posts are provided inside the upper shell and the bottom shell at the locations corresponding to the mounting holes. The upper shell and the bottom shell are connected by connecting bolts installed in the BOSS posts. A sealing plug is installed in each mounting hole. This technical solution uses a limiting plate to divide the power supply into a component compartment and a placement compartment for the battery module, making reasonable use of space. The limiting strip on the limiting plate works with the support to limit the battery module and prevent it from shifting inward. The protective plate between the battery module and the side plate of the upper shell acts as a buffer to improve its shock resistance. Furthermore, a protective sleeve is provided on the charging / discharging interface to prevent mud and water from entering the shell. The design of the above structure makes this power supply suitable for field operations.

[0006] Preferably, the bottom opening of the upper housing and the top opening of the bottom housing have stepped surfaces that fit together. The connection between the bottom housing and the upper housing, through the cooperation of the convex and concave stepped surfaces, serves to prevent water and dust from entering, reducing the impact of the environment on the battery and making it more suitable for field operations.

[0007] Preferably, two rows of opposing fasteners are provided on the bottom end face of the upper housing, and wedge-shaped locking blocks adapted to the fasteners are provided on the inner wall of the side plate of the bottom housing corresponding to the fasteners. The fasteners and the locking blocks engage. The design of the fasteners and locking blocks makes the connection between the bottom housing and the upper housing tighter and provides better waterproof and dustproof performance.

[0008] Preferably, a plurality of spaced retaining strips are provided around the inner wall of the bottom shell, extending upward from the bottom surface of the bottom shell along the inner wall to above the inner lower surface of the stepped surface of the bottom shell. The retaining strip design improves the strength of the bottom shell, and when the upper shell and the bottom shell are fastened together, the upper shell is secured between the retaining strips and the side wall of the bottom shell, preventing deformation of the lower part of the upper shell and improving its durability.

[0009] Preferably, a socket for mounting a lamp board is provided inside the bottom shell corresponding to the component compartment. The socket has a slot adapted to the lamp board, allowing the lamp board to be inserted into the socket. An indicator light is mounted on the lamp board. The slot helps to limit the position of the lamp board, preventing it from shifting during power supply transportation and carrying.

[0010] Preferably, a mounting groove is provided on the outer surface of the upper housing corresponding to the lamp plate, and a through hole is provided in the mounting groove corresponding to the indicator light. The circular lens of the indicator light is located in the through hole, and its top surface is lower than the bottom surface of the mounting groove.

[0011] Preferably, a cover plate is provided in the mounting groove, the shape of which is consistent with the shape of the mounting groove. One end of the cover plate is inserted into a socket on the upper housing, and the other end is sleeved on the power switch. The cover plate further improves the waterproof and dustproof capabilities of the power supply of this invention.

[0012] Preferably, an L-shaped pressure plate is provided in the inner cavity of the upper housing corresponding to the lamp board. The cooperation between the pressure plate and the socket can prevent the lamp board from shaking during use, thereby ensuring the reliability of the connection between the indicator light and the PCB.

[0013] Preferably, the battery module includes a plurality of battery cells and a battery cell mounting bracket. Each battery cell is mounted on the battery cell mounting bracket to form a battery cell assembly. An insulating fixing strip is provided on the outside of the battery cell assembly. An insulating plate and a PCB board are arranged sequentially below the battery cell assembly, and the positive and negative terminals are respectively connected to the PCB board via nickel strips. The mounting bracket can prevent the battery cells from shifting and improve the stability of their connection with the nickel strips.

[0014] Preferably, the cell mounting bracket includes a mounting base. The front of the mounting base has a gate-shaped mounting frame extending upwards from the bottom of one end of the mounting base, through its top, to the bottom of the other end. The back of the mounting base has a placement groove for placing nickel sheets. The inner side of the mounting frame has a mounting groove adapted to the cell. The mounting groove and a support block fixed to the mounting base form a mounting cavity for fixing the cell. Each mounting cavity has a connecting hole penetrating the mounting base at its center. The support block at the bottom of the mounting base and the bottom of the mounting frame form a receiving groove for accommodating the PCB board and insulating board. Placing the PCB board and insulating board in the receiving groove not only protects them but also helps reduce the battery size.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] 1. The power supply of this utility model is divided into a component compartment and a battery module compartment by a limiting plate, which makes reasonable use of space. The limiting strip on the limiting plate works with the support to limit the battery module and prevent it from shifting inward. A protective plate is set between the battery module and the side plate of the upper shell to buffer and improve its shock resistance. Furthermore, a protective sleeve is set on the charging and discharging interface to prevent mud and water from entering the shell. The above structure design makes the power supply suitable for field operation.

[0017] 2. This utility model forms a waterproof and dustproof stepped surface structure through the connection between the upper shell and the bottom shell, reducing the influence of the environment on the power supply. In addition, the indicator light and switch are provided with a cover plate, which preferably improves the dustproof and waterproof capability of the power supply, thereby meeting the requirements of field operations.

[0018] 3. This utility model sets a pressure plate in the component compartment and a socket in the bottom shell. The cooperation between the pressure plate and the socket fixes the lamp board inserted into the socket, preventing it from shifting and improving the stability of the internal components.

[0019] 4. This utility model not only fixes the battery cell on the fixing frame to prevent the battery cell from shifting, but also sets the insulating plate and PCB board inside the fixing frame. This not only prevents them from shifting and prevents the electrical components on the PCB board from desoldering due to their shifting, thus improving the stability of the power supply, but also protects the PCB board.

[0020] 5. In summary, the internal space of the power supply battery casing of this utility model is rationally utilized. Through the structural design of the casing, fixing frame, and socket, displacement of internal components can be effectively prevented, thus providing a foundation for power supply stability. The structural design is reasonable and highly practical. Moreover, the design of the sealing plug, cover plate, and protective sleeve for the charging and discharging interface can improve the waterproof and moisture-proof capabilities of this utility model power supply, thereby meeting the requirements of power supply operation in the field. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification and serve to further illustrate the preferred embodiments of the present invention, and together with the specification, serve to explain the principles of the present invention. In the drawings:

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0023] Figure 2 This is an exploded structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the upper shell of this utility model;

[0025] Figure 4 This is a schematic diagram of the bottom shell of this utility model;

[0026] Figure 5 This is a structural schematic diagram of the fixing frame of this utility model.

[0027] The diagram is labeled as follows: 1. Battery module; 101. Cell; 102. Cell mounting bracket; 1021. Mounting base plate; 1022. Mounting frame; 1023. Mounting groove; 1024. Support block; 1025. Connecting hole; 1026. Receiving groove; 103. Insulating fixing strip; 104. Insulating plate; 105. PCB board; 106. Nickel strip; 2. Upper shell; 3. Bottom shell; 4. Buckle; 5. Charging / discharging interface; 8. Indicator light switch; 9. Power switch; 10. Sealing plug; 11. Protective plate; 12. Indicator light; 13. Light board; 14. Connecting bolt; 15. Stepped surface; 16. Fixing buckle; 17. Clamping block; 18. Support; 19. BOSS column; 20. Limiting plate; 21. Limiting strip; 22. Pressure plate; 23. Mounting groove; 24. Clamping strip; 25. Clearance groove; 26. Socket; 27. Slot. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0029] The following is a reference to the appendix. Figures 1 to 5 This invention provides a detailed description of a preferred embodiment of a power supply with a built-in charger.

[0030] Example: Figure 1 and Figure 2 The diagram shows a power supply with a built-in charger and a built-in charging management circuit. It includes a battery module 1, an upper housing 2, and a bottom housing 3. The upper housing 2 is a hollow box structure with an open bottom, formed by a top plate and side plates fixed around the top plate. The bottom housing 2 is a housing with an open top. The upper housing 2 and the bottom housing 3 are connected in a sealed manner to seal the bottom opening of the upper housing 2, forming a space for accommodating the battery module 1. Both the upper housing 2 and the bottom housing 3 are made of plastic using injection molding. A buckle 4 is provided on the top surface of the upper housing 2, which facilitates hanging the power supply on a shoulder strap for easy carrying during field operations. See also... Figure 3A limiting plate 20 is provided at the top of the inner cavity of the upper housing 2. A limiting strip 21 is provided at the connection between the limiting plate 20 and the upper housing 2. The limiting strip 21 is approximately triangular. One side of the limiting strip 21 is connected to the inner surface of the top plate of the upper housing 21, and the adjacent side is connected to the limiting plate 21. The design of the limiting strip 21 improves the strength of the limiting plate 20. The side of the limiting strip 21 facing the battery module 1 is arc-shaped and adapted to the battery module 1. The limiting plate 20 divides the upper housing 2 into a component compartment A and a placement compartment B for placing the battery module 1. A charging and discharging interface 5 is provided on the side plate of the upper housing 2 corresponding to the component compartment A. A power switch 9 is provided on the end plate of the upper housing 2 near the charging and discharging interface 5. An indicator light 12 is provided on one side of the power switch 9. The indicator light 12 is used to display the power level. There are multiple indicator lights 12. For easy installation of the indicator lights 12, the indicator lights 12 are mounted on a light plate 13. An indicator light switch 8 is provided on one side of the indicator light 12. The indicator light switch 8 is a push-button switch. The charging / discharging interface 5 is connected to a protective sleeve 6 via a connecting strip. When not in use, the protective sleeve 6 is inserted into the charging / discharging interface 5, providing waterproofing and dustproofing. It also protects the charging / discharging interface 5 from damage during transportation and carrying, ensuring its normal operation and improving its durability. A cover plate 7 is provided on the outside of the indicator light 12, fitting snugly against the outer surface of the upper housing 2. One end of the cover plate 7 is fixedly connected to a connecting post (not shown in the figure), which inserts into the insertion hole 24 on the upper housing 2. The other end of the cover plate 7 is sleeved on the power switch 9, preventing dust and dirt from entering the interior through the gap between the power switch 9 and the upper housing 2, thus providing waterproofing and dustproofing, reducing the power supply's susceptibility to environmental influences, and improving its stability and reliability. Both the cover plate 7 and the protective sleeve 6 are made of rubber.

[0031] See Figure 2 and Figure 4 A support 18 is provided at the bottom of the inner cavity of the bottom shell 3 in the area corresponding to the placement of the compartment B. In this embodiment, there are 4 supports, which are arranged in groups of 2 and distributed on both sides of the bottom plate of the bottom shell 3 to support the battery module 1. After the upper shell 1 is installed on the bottom shell 3, the 4 supports 18 support the battery module 1. The top plate of the upper shell 2 and the supports 18 limit the vertical placement of the battery module 1 to prevent the battery module 1 from shifting in the vertical direction. The limiting strip 21 and the side plates of the upper shell 2 and the bottom shell 3 limit the horizontal direction of the battery module to prevent it from shifting.

[0032] See Figure 2To improve the shock resistance, insulation, and battery module displacement of the power supply of this utility model, a protective plate 11 is provided between the battery module 1 and the upper shell 2. The protective plate 11 is a sponge plate or a rubber plate. To facilitate the connection between the upper shell 2 and the bottom shell 3, mounting holes are provided at the four corners of the top plate of the upper shell 2. BOSS posts 19 are provided inside the upper shell 2 and the bottom shell 3 at the corresponding mounting holes. The upper shell 2 and the bottom shell 3 are connected by connecting bolts 14 installed in the BOSS posts. During assembly, after tightening the connecting lug bolts 14, a sealing plug 10 is inserted into each mounting hole. The sealing plug 10 can prevent water and mud from entering the mounting hole, thereby improving its waterproof and dustproof capabilities.

[0033] To further improve the waterproof and dustproof capabilities of the power supply of this utility model and reduce the impact of the environment, in this embodiment, see... Figure 2 The upper shell 2 has stepped surfaces 15 around the bottom opening and the bottom shell 3. In this embodiment, the inner side of the bottom end face of the upper shell 2 extends downward to form a convex surface with the inner side of the bottom surface higher than the outer side. Conversely, a concave surface that matches the convex surface is provided on the top surface of the bottom shell. The two together form a dustproof and waterproof structure. The combination of the upper shell 2 and the bottom shell 3 forms a waterproof and dustproof structure. The design is reasonable and does not require additional sealing rings, making assembly convenient.

[0034] Because the spectrum analyzer used in field operations needs to be moved frequently, the power supply for it also needs to be moved and transported frequently. To prevent the connecting bolts between the upper shell and the lower shell from loosening during carrying and transportation, two rows of opposing fixing buckles 16 are provided on the bottom end face of the upper shell 2. The fixing buckles 16 are integrally formed with the upper shell 2 to ensure connection strength. On the inner wall of the side plate of the lower shell 3, corresponding to the fixing buckles 16, there are wedge-shaped locking blocks 17 that are adapted to the fixing buckles 16. The locking blocks 17 are integrally formed with the lower shell 3, and the fixing buckles 16 and locking blocks 17 are engaged. Around the locking blocks 17, there are clearance grooves 25 with open tops that are adapted to the fixing buckles 16. The wedge-shaped design of the locking blocks 17 facilitates the connection between the fixing buckles 16 and the locking blocks 17 during assembly. Multiple spaced retaining strips 24 are provided around the inner wall of the bottom shell 3. The retaining strips 24 extend upward from the bottom surface of the bottom shell 3 along the inner wall of the bottom shell 3 to the inner lower surface of the stepped surface of the bottom shell 3. After assembly, the lower part of the upper shell 2 is inserted between the retaining strips 24 and the side wall of the bottom shell to prevent the lower part of the bottom shell from deforming. Moreover, the setting of the retaining strips 24 also improves the strength of the bottom shell 3, prevents the bottom shell from deforming, and extends its service life.

[0035] In this embodiment, as Figure 4As shown, a socket 26 for mounting the lamp board 13 is provided in the bottom shell 3 at the component compartment A. A slot 27 adapted to the lamp board 13 is provided on the socket 26 so that the lamp board 13 can be inserted into the socket 26. An indicator light 12 is mounted on the lamp board 13; in this embodiment, the indicator light is a light-emitting diode. An L-shaped pressure plate 22 is provided in the inner cavity of the upper shell 2 at the location corresponding to the lamp board 13. The pressure plate 22 cooperates with the socket 26 to limit the lamp board 13 and prevent it from shifting.

[0036] In this embodiment, a mounting groove 23 is provided on the outer side of the upper housing 2 corresponding to the lamp plate 13. The shape of the mounting groove 23 is consistent with the shape of the cover plate 7. The cover plate 7 is set in the mounting groove 23. A through hole is opened in the mounting groove 23 corresponding to the indicator light 12. The circular lens of the indicator light 12 is located in the through hole, and its top surface is lower than the bottom surface of the mounting groove 23 to prevent the indicator light 12 from being damaged. The cover plate 7 is provided to prevent mud and sand from entering the battery housing through the through hole at the indicator light 12.

[0037] The battery module 1 includes several battery cells 101 and a battery cell mounting bracket 102. Each battery cell 101 is mounted on the battery cell mounting bracket 102 to form a battery cell assembly. An insulating fixing strip 103 is provided on the outside of the battery cell assembly. The insulating fixing strip 103 is a limiting tape. The battery cell mounting bracket 102 is located at both ends of the battery cell 101, and the insulating fixing strip 103 is located in the middle of the battery cell. The battery cell 101 is fixed by the battery cell mounting bracket 102, and the insulating fixing strip 103 prevents its deformation, thereby improving durability. An insulating plate 104 and a PCB board 105 are arranged in sequence below the battery cell assembly. The positive and negative electrodes are connected to the PCB board 105 through nickel strips 106, respectively.

[0038] The battery cell fixing bracket of this utility model is a plastic part, and its structure is as follows: Figure 5As shown, the battery cell mounting bracket 102 in this embodiment includes a mounting base 1021. A portal frame 1022 is provided on the front side of the mounting base 1021, extending upward from the bottom of one end of the mounting base 1021, through its top, to the bottom of the other end. A placement groove for placing nickel sheets is provided on the back side. A mounting groove 1023 adapted to the battery cell is provided on the inner side of the mounting frame 1022. The mounting groove 1023 and the support block 1024 fixed on the mounting base 1021 form a mounting cavity for fixing the battery cell. The support block 1024 and the mounting base 1021 are integrally formed. A through-hole fixing hole is provided in the center of each mounting cavity. The connection hole 1025 of the substrate 1021 is designed to facilitate the connection between the nickel strip 106 and the battery cell 101. The support block 1024 located at the bottom of the fixed substrate 1021 and the bottom of the fixed frame 1022 form a receiving groove 1026 for accommodating the PCB board 105 and the insulating board 104. The insulating board 104 and the PCB board 105 are placed at the bottom of the battery cell, saving hole space and helping to reduce the size of the power supply. Moreover, the insulating board 104 and the PCB board 105 are placed in the receiving groove 1026, which protects the insulating board 104 and the PCB board 105 and also plays a limiting role, preventing them from deforming and shifting, and extending their service life.

[0039] This utility model's power supply is divided into a component compartment and a battery module compartment by a limiting plate, making efficient use of space. The limiting strips on the limiting plate work in conjunction with the support to limit the battery module and prevent it from shifting inwards. A protective plate is placed between the battery module and the side plate of the upper shell to provide cushioning and improve its shock resistance. A protective sleeve is also provided on the charging and discharging interface to prevent mud and water from entering the casing. This structural design makes the power supply suitable for field operations. Furthermore, the connection between the upper and lower shells forms a waterproof and dustproof stepped surface structure, reducing the power supply's susceptibility to environmental influences. A pressure plate is installed in the component compartment, and a socket is installed in the lower shell. The cooperation of the pressure plate and the socket secures the light board inserted into the socket, preventing it from shifting.

[0040] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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 power supply with built-in charger, comprising a battery module, an upper case and a bottom case, characterized in that, The top surface of the upper shell is provided with a buckle, the top of the inner cavity of the upper shell is provided with a limiting plate, the connecting position between the limiting plate and the upper shell is provided with a limiting strip, the side of the limiting strip facing the battery module is adapted to the arc of the battery module, the limiting plate divides the upper shell into an element compartment and a placing compartment for placing the battery module, a charging and discharging interface is arranged on the front surface of the upper shell corresponding to the element compartment, a power switch is arranged at one end of the element compartment of the upper shell, an indicator lamp is arranged on one side of the power switch, the charging and discharging interface is connected with a protective sleeve through a connecting strip, the bottom of the inner cavity of the bottom shell is provided with a support corresponding to the area of the placing compartment, a protective plate is arranged between the battery module and the upper shell, the top plate of the upper shell is provided with mounting holes at four corners, a BOSS column is arranged in the upper shell and the bottom shell corresponding to the mounting holes, the upper shell and the bottom shell are connected through connecting bolts installed in the BOSS columns, and sealing plugs are installed in each mounting hole.

2. The power supply with a built-in charger according to claim 1, wherein The bottom opening of the upper shell and the top opening of the bottom shell are provided with step surfaces matched.

3. The power supply with a built-in charger according to claim 2, wherein Two rows of fixed buckles are arranged on the bottom end surface of the upper shell, wedge-shaped clamping blocks matched with the fixed buckles are arranged on the inner wall of the side plate of the bottom shell corresponding to the fixed buckles, and the fixed buckles and the clamping blocks are clamped.

4. The power supply with a built-in charger of claim 2, wherein, A plurality of spaced clamping strips are arranged around the inner wall of the bottom shell, and the clamping strips extend upward from the bottom surface of the bottom shell to above the inner side low surface of the step surface of the bottom shell along the inner wall of the bottom shell.

5. The power supply with a built-in charger of claim 1, wherein, A socket for installing a lamp plate is arranged in the bottom shell corresponding to the element compartment, a slot matched with the lamp plate is arranged on the socket, so that the lamp plate is inserted into the socket, and an indicator lamp is installed on the lamp plate.

6. The power supply with a built-in charger according to claim 5, wherein An installation groove is arranged on the outer surface of the upper shell corresponding to the lamp plate, a through hole is formed in the installation groove corresponding to the indicator lamp, the circular lens of the indicator lamp is located in the through hole, and the top surface of the indicator lamp is lower than the bottom surface of the installation groove.

7. The power supply with a built-in charger according to claim 6, wherein A cover plate is arranged in the installation groove, the shape of the cover plate is consistent with the shape of the installation groove, one end of the cover plate is inserted into a plug hole formed in the upper shell, and the other end of the cover plate is sleeved on the power switch.

8. The power supply with a built-in charger of claim 5, wherein, An L-shaped pressing plate is arranged in the inner cavity of the upper shell corresponding to the lamp plate.

9. The power supply with a built-in charger of claim 1, wherein, The battery module comprises a plurality of battery cells and a battery cell fixing frame, each battery cell is clamped on the battery cell fixing frame to form a battery cell group, an insulating fixing belt is arranged on the outer side of the battery cell group, an insulating plate and a PCB plate are sequentially arranged below the battery cell group, and the positive and negative electrodes are connected with the PCB plate through nickel belts.

10. The power supply with a built-in charger according to claim 9, wherein The electric core fixing frame comprises a fixing base plate, the front surface of the fixing base plate is provided with a door-shaped fixing frame extending from the bottom of one end of the fixing base plate upward through the top thereof to the bottom of the other end, the back surface of the fixing base plate is provided with a placing groove for placing a nickel sheet, the inner side of the fixing frame is provided with a fixing groove matched with an electric core, the fixing groove and a supporting block fixed on the fixing base plate enclose a fixing cavity for fixing the electric core, the center of each fixing cavity is provided with a connecting hole penetrating through the fixing base plate, and the supporting block at the bottom of the fixing base plate and the bottom of the fixing frame enclose a containing groove for containing a PCB and an insulating plate.

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