Dual-path output lithium ion battery charger carrying electric quantity equalization circuit

Abstract

The invention discloses a dual-path output lithium ion battery charger carrying an electric quantity equalization circuit, and belongs to the field of ion battery chargers, the dual-path output lithium ion battery charger comprises an outer cover shell, a charging management main board and a side buffer pad, one side of the outer cover shell is connected with an external socket in a penetrating manner, a display screen is arranged right above the outer cover shell, and the side buffer pad is connected with the charging management main board. The outer side of the outer cover shell is connected with a handle through a bearing, and side buffering pads are arranged on the two sides of the outer cover shell in an attached mode. A power-off mechanism is arranged at the top end of the outer cover shell, and the power-off mechanism pulls and separates the wiring position of the charger according to the running stability of the charger, so that the charger is prevented from being short-circuited. According to the invention, the buffer mechanism is arranged, the two groups of circuit board supporting plates are connected through the rubber pads, and the supporting plates are matched with the arc-shaped sliding grooves through the sliding blocks, so that the impact force can be effectively buffered, and when the sliding blocks move along the arc-shaped sliding grooves, the direction of impact force is decomposed into tangential and normal components by an arc-shaped path.

Description

Technical Field

[0001] The present invention belongs to the field of lithium battery charging, and in particular relates to a dual-output lithium-ion battery charger equipped with a power balancing circuit. Background Art

[0002] Dual-output lithium-ion battery charging technology enables efficient and safe charging of two battery packs by independently controlling two charging channels. A single charging control chip drives two switching modules, alternating between charging the two series-connected batteries. This solution ensures full charging of each battery cell with high voltage consistency while reducing component count, resulting in smaller size and lower cost.

[0003] However, the lack of a physical disconnection mechanism in lithium-ion battery chargers may affect safety. When the charger is connected to a power source, even if it is not charging, the internal circuit continues to work, causing accelerated component aging and shortening of service life. Although the lithium battery charger is equipped with an electronic protection circuit, the electronic protection circuit of the lithium battery charger cannot replace the physical power disconnection. In the absence of a disconnection mechanism, long-term connection to the power source will accelerate component aging and accumulate fire hazards. At the same time, the lack of a circuit board impact buffer structure inside the charger will significantly reduce the mechanical reliability of the product and increase the risk of failures such as short circuits and component detachment. Summary of the Invention

[0004] The object of the present invention is to provide a dual-output lithium-ion battery charger equipped with a battery balancing circuit.

[0005] A dual-output lithium-ion battery charger equipped with a power balancing circuit includes an outer shell, a charging management mainboard, and side cushions. An external socket is connected through one side of the outer shell, a display screen is provided directly above the outer shell, a handle is connected to an outer bearing of the outer shell, and side cushions are provided on both sides of the outer shell.

[0006] A power-off mechanism is provided at the top of the outer shell. The power-off mechanism pulls and separates the charger's wiring according to the stability of the charger during operation, thereby preventing the charger from short-circuiting and ensuring its safe operation. The wires of the charging management motherboard are connected to the input terminal of the display screen.

[0007] A buffer mechanism is provided inside the outer shell. The buffer mechanism connects the charging management mainboard and the circuit board support plate through a rubber pad. At the same time, the support plate uses a slider and an arc-shaped slide groove to buffer the impact force of the charging management mainboard.

[0008] A disassembly mechanism is provided at the inner end of the outer cover shell, which is used to disassemble and install the outer cover shell and the bottom end according to usage requirements, so as to facilitate regular inspection and replacement of the charging management mainboard inside the outer cover shell. A heat dissipation mechanism is provided directly below the charging management mainboard, which draws external air into the interior of the outer cover shell, dissipates the heat of the charging management mainboard inside the outer cover shell, and filters the inhaled air at the same time.

[0009] Preferably, the power-off mechanism includes a winding reel, a power supply line, a drive shaft, a ratchet disc, a drive disc and a pawl. The winding reel is arranged directly above the outer cover shell, the outer side of the winding reel is connected to the power supply line, the top of the power supply line is connected to the charging management mainboard, the outer key of the winding reel is connected to the drive shaft, the bottom end of the drive shaft is connected to the ratchet disc, the bottom end of the ratchet disc is provided with a drive disc, the outer side of the drive disc is connected to multiple groups of pawls, and the drive shaft is connected to the outer cover shell.

[0010] Preferably, the pawls arranged in a rectangular shape on the outer side of the ratchet disc are connected to the outer side of the ratchet disc, and the top end of the ratchet disc is connected to the bottom end of the driving shaft.

[0011] Preferably, the buffer mechanism includes an arc-shaped slide, a support plate, an inner copper column, a slider, a ventilation hole, a flexible rubber strip and a groove. The arc-shaped slide is symmetrically opened on both sides of the base. The internal spring of the arc-shaped slide is connected to the slider. The slider is symmetrically arranged on both sides of the support plate. The inner copper columns are arranged at equal intervals directly above the support plate, and the charging management mainboard is arranged directly above the inner copper columns.

[0012] Preferably, the flexible rubber strip is connected to one end of the two groups of support plates through grooves provided on both sides, and the flexible rubber strip is connected to the inner end of the base via an axis.

[0013] Preferably, the disassembly mechanism includes a base, a slot, a fastener, a transverse clip, an exhaust hole and an outer sealing strip. Slots are provided on both sides of the base. Fasteners are connected to the outer sides of the slots at equal intervals. The outer sides of the slots are engaged with transverse clips. Fasteners are connected to the outer sides of the transverse clips. The outer sides of the transverse clips are penetrated by fasteners. The outer side of the outer cover shell is provided with the outer side of the other side of the transverse clip. Exhaust holes are provided on one side of the outer cover shell at equal intervals. The outer sealing strip is distributed in a "U" shape at the inner end of the outer cover shell.

[0014] Preferably, the outer cover shell is fitted with both sides of the base through an outer sealing strip provided at the inner end.

[0015] Preferably, the heat dissipation mechanism includes a servo motor, an air guide cover, fan blades, a power supply module, a paper filter element, a mesh plate and a magnetic sheet. The servo motor is installed inside the base, the output end shaft of the servo motor is connected to the fan blades, the fan blades are arranged inside the air guide cover, the air guide cover is connected to the base, a power supply module is provided on one side of the servo motor, the paper filter element is symmetrically arranged inside the base, the paper filter element is arranged directly above the mesh plate, a plurality of magnetic sheets are symmetrically arranged on the outside of the mesh plate, and the mesh plate is symmetrically arranged at the bottom end of the base.

[0016] Preferably, the mesh plate is connected to the rectangular opening at the bottom end of the base through a plurality of magnetic sheets arranged at equal intervals on the outside.

[0017] The advantages of the present invention are:

[0018] 1. The present invention provides a buffer mechanism, in which the two sets of circuit board trays are connected by rubber pads. At the same time, the trays use sliders and arc-shaped slide grooves to effectively buffer the impact force. When the slider moves along the arc-shaped slide groove, the direction of the impact force is decomposed into tangential and normal components by the arc path, which prolongs the action time of the force and reduces the peak impact intensity. When the slider is subjected to continuous dynamic loads (such as stamping equipment and transportation vibrations), the spring can absorb instantaneous impact energy to prevent deformation or wear caused by hard collision between the slider and the slide groove.

[0019] 2. When the servo motor rotates in the opposite direction, the pawl engages the ratchet tooth groove to form a rigid connection, transmitting the reverse torque to the winding reel. The reverse rotation of the pawl drives the winding reel, directly pulling the plug and socket apart, achieving a complete power outage at the physical level. This avoids the risk of contact adhesion or false triggering that may exist in electronic switches. The power-off action is directly driven by the reverse rotation of the servo motor, without the need for external power supply or control signal. Even if the charger's main circuit fails, it can still force the power off, providing failure protection capabilities.

[0020] 3. By setting up a heat dissipation mechanism, the base is symmetrically provided with slots for engagement and assembly with the outer cover shell, thereby facilitating the disassembly and assembly of the outer cover shell. At the same time, the magnetic sheet provided on the outside of the mesh plate is magnetically replaced with the bottom of the base. Efficient cooling is achieved through physical isolation, air filtration and directional airflow management. The bottom of the charging management motherboard is suspended by internal copper pillars arranged at equal intervals, thereby improving the uniformity of heat dissipation and air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the overall side structure of the present invention.

[0023] Figure 3It is a partial side sectional view of the outer cover shell in the present invention.

[0024] Figure 4 It is a schematic diagram of the side structure of the base in the present invention.

[0025] Figure 5 It is a side view of the buffer mechanism structure in the present invention.

[0026] Figure 6 This is a bottom view of the structure of the power-off mechanism of the present invention.

[0027] Figure 7 This is a bottom view of the base in the present invention.

[0028] Figure 8 It is a bottom view schematic diagram of the heat dissipation mechanism in the present invention.

[0029] Figure 9 It is a schematic side view of the base in the present invention.

[0030] Figure 10 This is the dual output control flow chart of the present invention

[0031] in:

[0032] 1. Outer housing; 2. External socket; 3. Display screen; 4. Handle;

[0033] 5. Power-off mechanism; 51. Winding reel; 52. Power supply line; 53. Drive shaft; 54. Ratchet disc; 55. Drive disc; 56. Pawl;

[0034] 6. Buffer mechanism; 61. Arc-shaped slide; 62. Support plate; 63. Internal copper column; 64. Slider; 65. Ventilation hole; 66. Flexible rubber strip; 67. Groove;

[0035] 7. Disassembly mechanism; 71. Base; 72. Slot; 73. Fastener; 74. Horizontal clip; 75. Exhaust hole; 76. External sealing strip;

[0036] 8. Charging management motherboard;

[0037] 9. Heat dissipation mechanism; 91. Servo motor; 92. Air guide cover; 93. Fan blades; 94. Power supply module; 95. Paper filter element; 96. Screen; 97. Magnetic sheet

[0038] 10. Side cushions. DETAILED DESCRIPTION

[0039] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0040] like Figures 1 to 10As shown, a dual-output lithium-ion battery charger equipped with a power balancing circuit includes an outer cover shell 1, a charging management mainboard 8 and a side buffer pad 10. An external socket 2 is connected through one side of the outer cover shell 1. A display screen 3 is provided directly above the outer cover shell 1. A handle 4 is connected to the outer bearing of the outer cover shell 1. Side buffer pads 10 are fitted on both sides of the outer cover shell 1. A power-off mechanism 5 is provided at the top of the outer cover shell 1. The power-off mechanism 5 pulls and separates the connection points of the charger according to the stability of the charger during operation, thereby avoiding the charger from short-circuiting and ensuring its operation safety. The wires of the charging management mainboard 8 are connected to the input end of the display screen 3. A buffer mechanism 6 is provided inside the outer cover shell 1. The buffer mechanism 6 connects the charging management mainboard 8 and the circuit board through a rubber pad. At the same time, the support plate 62 adopts a slider 64 to cooperate with the arc-shaped slide groove 61 to buffer the impact force of the charging management mainboard 8.

[0041] A disassembly mechanism 7 is provided at the inner end of the outer cover shell 1. The disassembly mechanism 7 is used to disassemble and install the outer cover shell 1 and the bottom end according to usage requirements, so as to facilitate regular inspection and replacement of the charging management mainboard 8 inside the outer cover shell 1. A heat dissipation mechanism 9 is provided directly below the charging management mainboard 8. The heat dissipation mechanism 9 draws external air into the interior of the outer cover shell 1, dissipates the heat from the charging management mainboard 8 inside the outer cover shell 1, and filters the inhaled air at the same time.

[0042] The power-off mechanism 5 includes a winding reel 51, a power supply line 52, a drive shaft 53, a ratchet disc 54, a drive disc 55 and a pawl 56. The winding reel 51 is arranged directly above the outer cover shell 1. The outer side of the winding reel 51 is connected to the power supply line 52. The top of the power supply line 52 is connected to the charging management mainboard 8. The outer key of the winding reel 51 is connected to the drive shaft 53. The bottom end of the drive shaft 53 is connected to the ratchet disc 54. The bottom end of the ratchet disc 54 is provided with a drive disc 55. The outer side of the drive disc 55 is connected to multiple groups of pawls 56. The drive shaft 53 is connected to the outer cover shell 1; the pawls 56 distributed in a rectangular pattern on the outer side of the ratchet disc 54 are connected to the outer side of the ratchet disc 54, and the top of the ratchet disc 54 is connected to the bottom end of the drive shaft 53. The winding reel 51 is driven by the reverse rotation of the pawl 56, which directly pulls the plug and the socket apart, thereby achieving a complete power outage at the physical level.

[0043] The buffer mechanism 6 includes an arc-shaped slide 61, a support plate 62, an inner copper column 63, a slider 64, a ventilation hole 65, a flexible rubber strip 66 and a groove 67. The arc-shaped slide 61 is symmetrically opened on both sides of the base 71. The internal spring of the arc-shaped slide 61 is connected to the slider 64. The slider 64 is symmetrically arranged on both sides of the support plate 62. The inner copper columns 63 are arranged at equal intervals directly above the support plate 62. The charging management mainboard 8 is arranged directly above the inner copper columns 63; the flexible rubber strip 66 is connected to one end of the two groups of support plates 62 through the grooves 67 arranged on both sides. The flexible rubber strip 66 is axially connected to the inner end of the base 71. The grooves 67 arranged on both sides of the flexible rubber strip 66 are used to flexibly connect the two sides of the support plate 62 to avoid damage to the charging management mainboard 8 caused by hard collision due to the rigid connection.

[0044] The disassembly mechanism 7 includes a base 71, a slot 72, a fastener 73, a transverse clip 74, an exhaust hole 75 and an outer sealing strip 76. Slots 72 are provided on both sides of the base 71. Fasteners 73 are connected to the outer sides of the slots 72 at equal intervals. The outer sides of the slots 72 are engaged with transverse clips 74. Fasteners 73 are connected to the outer sides of the transverse clips 74 through which the fasteners 73 are connected. The other side of the transverse clip 74 is provided with the outer side of the outer cover shell 1. Exhaust holes 75 are provided on one side of the outer cover shell 1 at equal intervals. The outer sealing strip 76 is distributed in a "U" shape at the inner end of the outer cover shell 1. The outer cover shell 1 is fitted with both sides of the base 71 through the outer sealing strip 76 provided at the inner end. The symmetrical arrangement of the outer sealing strips 76 on both sides of the inner end of the outer cover shell 1 eliminates the leakage dead angle at the contact between the outer cover shell 1 and the base 71, and prevents dust or liquid from invading the interior of the outer cover shell 1 from the side, causing corrosion of the internal electronic components.

[0045] The heat dissipation mechanism 9 includes a servo motor 91, an air guide cover 92, fan blades 93, a power supply module 94, a paper filter element 95, a mesh plate 96 and a magnetic sheet 97. The servo motor 91 is installed inside the base 71. The output end shaft of the servo motor 91 is connected to the fan blade 93. The fan blade 93 is arranged inside the air guide cover 92. The air guide cover 92 is connected to the base 71. A power supply module 94 is provided on one side of the servo motor 91. The paper filter element 95 is symmetrically arranged inside the base 71. The paper filter element 95 is arranged directly above the mesh plate 96. A plurality of magnetic sheets 97 are symmetrically arranged on the outside of the mesh plate 96. The mesh plate 96 is symmetrically arranged at the bottom end of the base 71; the mesh plate 96 is connected to the rectangular opening at the bottom end of the base 71 through a plurality of magnetic sheets 97 arranged at equal intervals on the outside. The air guide cover 92 forces the airflow to concentrate through the bottom end of the charging management main board 8 to avoid airflow diffusion loss, thereby shortening the time required for the charging management main board 8 to dissipate heat.

[0046] The charger works as follows:

[0047] Charging steps: The operator grips the handle 4 to move the outer cover shell 1, inserts the power supply line 52 into the 220V power supply, and then connects the external socket 2 to the wire. After inserting the battery, the charging management motherboard 8 determines the connection status by detecting the point voltage. The total power is divided into two paths. For example, if the input wattage of the power supply is 100W, 100W can be divided into 50W and input into the two groups of lithium batteries. The management chip (such as the model LGS4084H chip) on the charging management motherboard 8 selects the appropriate charging mode according to the battery type and status, and sets the charging current through an external resistor, and displays the current and voltage through the display 3;

[0048] Charger power-off steps: Servo motor 91 driving stage, when the servo motor 91 rotates forward, the servo motor 91 drives the fan blade 93 to rotate through the transmission shaft, and at the same time drives the driving disk 55 and the pawl 56 to rotate, and the pawl 56 has a one-way locking feature: at this time, the pawl 56 slides on the ratchet disk 54 and does not transmit torque to the winding disk 51; Reverse trigger power-off stage; when the servo motor 91 rotates reversely, multiple pawls 56 are arranged on the outside of the driving disk 55 and are embedded in the teeth of the ratchet disk 54 to form a rigid connection, and the reverse torque is transmitted to the winding disk 51 for rotation, and the power supply line 52 is pulled by the rotation of the winding disk 51, forcibly separating the plug and socket provided at the top of the power supply line 52 to achieve power off;

[0049] The operator manually moves the two sides of the outer shell 1 so that the transverse clamping strips 74 on both sides of the outer shell 1 engage with the outer sides of the clamping slots 72. The operator then inserts the fasteners 73 into the transverse clamping strips 74 and the outer sides of the clamping slots 72 to engage and seal the outer shell 1 and the base 71. The operator then seals the two sides of the base 71 with the outer sealing strips 76 provided on the outer side of the outer shell 1 to prevent external moisture from entering the interior of the base 71. The heat in the device is discharged through the exhaust holes 75 provided therethrough.

[0050] Heat dissipation step: The operator turns on the servo motor 91, which drives the fan blades 93 to rotate, so that the outside air is filtered through the mesh plate 96 set at the bottom and injected into the hollow layer formed by the base 71 and the outer cover shell 1. At the same time, the paper filter element 95 is used to filter the dust during the inhalation process, and the flowing air is vertically introduced into the interior of the outer cover shell 1 through the air guide cover 92. The flowing air is circulated and cooled through the ventilation holes 65 opened on the outside of the flexible rubber strip 66, and the hot air is directly discharged through the exhaust hole 75.

[0051] Installation steps: The operator connects the two sides of the flexible rubber strip 66 to one side of the support plate 62, connects the flexible rubber strip 66 and the two groups of support plates 62 with bolts, and connects the two sides of the support plate 62 to the slider 64 at the same time, so that the slider 64 is connected and slides with the arc-shaped slide groove 61, and uses the inner copper pillars 63 arranged at equal intervals to position the bottom end of the charging management motherboard 8. The motherboard outputs the video signal to the surface of the display screen 3 through the 30-pin LVDS interface, which is convenient for users to observe the data and disconnect the rechargeable battery;

[0052] Buffer protection step: connect the sliders 64 set on both sides to the arc-shaped slide groove 61, and use the sliders 64 to connect on the outside of the support plate 62, and support the two groups of charging management mainboards 8 through the two groups of support plates 62. When the outer cover shell 1 falls or collides, it is first protected by the side buffer pad 10. At the same time, the flexible rubber strips 66 connected between the two groups of support plates 62 serve as elastic elements. When the flexible rubber strips 66 are impacted, they absorb energy by deformation, reducing the instantaneous impact force transmitted to the charging management mainboard 8. When the slider 64 moves along the arc-shaped slide groove 61, the direction of the impact force is decomposed into tangential and normal components by the arc path. At the same time, the slider 64 generates friction resistance when sliding in the arc-shaped slide groove 61, further consuming impact energy, and avoiding excessive impact force on the charging management mainboard 8, which causes the electronic components on the charging management mainboard 8 to fall and be damaged.

[0053] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A dual-output lithium-ion battery charger equipped with a power balancing circuit, comprising an outer housing (1), a charging management mainboard (8) and side buffer pads (10), characterized in that: An external socket (2) is connected through one side of the outer shell (1), a display screen (3) is provided directly above the outer shell (1), a handle (4) is connected to the outer bearing of the outer shell (1), and side cushions (10) are fitted on both sides of the outer shell (1); A power-off mechanism (5) is provided at the top of the outer shell (1). The power-off mechanism (5) pulls and separates the charger's wiring according to the charger's operational stability, thereby preventing the charger from short-circuiting and ensuring its operational safety. The electric wires of the charging management mainboard (8) are connected to the input end of the display screen (3). A buffer mechanism (6) is provided inside the outer cover shell (1), and the buffer mechanism (6) is connected to the charging management mainboard (8) and the circuit board via a rubber pad to buffer the impact force of the charging management mainboard (8); A disassembly mechanism (7) is provided at the inner end of the outer cover shell (1). The disassembly mechanism (7) disassembles and installs the outer cover shell (1) and the bottom end according to the use requirements, so as to facilitate regular inspection and replacement of the charging management mainboard (8) inside the outer cover shell (1). A heat dissipation mechanism (9) is provided directly below the charging management mainboard (8). The heat dissipation mechanism (9) draws external air into the interior of the outer cover shell (1), dissipates heat from the charging management mainboard (8) inside the outer cover shell (1), and filters the inhaled air.

2. The dual-output lithium-ion battery charger equipped with a cell balancing circuit according to claim 1, characterized in that: The power-off mechanism (5) comprises a winding disk (51), a power supply line (52), a drive shaft (53), a ratchet disk (54), a drive disk (55) and a pawl (56); the winding disk (51) is arranged directly above the outer cover shell (1); the outer side of the winding disk (51) is connected to the power supply line (52); the top of the power supply line (52) is connected to the charging management mainboard (8); the outer key of the winding disk (51) is connected to the drive shaft (53); the bottom end of the drive shaft (53) is connected to the ratchet disk (54); the bottom end of the ratchet disk (54) is provided with a drive disk (55); the outer side of the drive disk (55) is connected to multiple groups of pawls (56); the drive shaft (53) passes through and is connected to the outer cover shell (1).

3. The dual-output lithium-ion battery charger equipped with a power balancing circuit according to claim 2, characterized in that: The pawls (56) distributed in a rectangular shape on the outer side of the ratchet disc (54) are connected to the outer side of the ratchet disc (54), and the top end of the ratchet disc (54) is connected to the bottom end of the driving shaft (53).

4. The dual-output lithium-ion battery charger equipped with a cell balancing circuit according to claim 1, characterized in that: The buffer mechanism (6) comprises an arc-shaped chute (61), a support plate (62), an inner-toothed copper column (63), a slider (64), a ventilation hole (65), a flexible rubber strip (66) and a groove (67); the arc-shaped chute (61) is symmetrically arranged on both sides of the base (71); the internal spring of the arc-shaped chute (61) is connected to the slider (64); the slider (64) is symmetrically arranged on both sides of the support plate (62); the inner-toothed copper column (63) is arranged at equal intervals directly above the support plate (62); and the charging management mainboard (8) is arranged directly above the inner-toothed copper column (63).

5. The dual-output lithium-ion battery charger equipped with a power balancing circuit according to claim 4, characterized in that: The flexible rubber strip (66) is connected to one end of the two sets of support plates (62) through grooves (67) provided on both sides, and the flexible rubber strip (66) is connected to the inner end of the base (71) via an axis.

6. The dual-output lithium-ion battery charger equipped with a cell balancing circuit according to claim 1, characterized in that: The disassembly mechanism (7) comprises a base (71), a slot (72), a fastener (73), a transverse clip (74), an exhaust hole (75) and an outer sealing strip (76). The base (71) is provided with a slot (72) on both sides. The outer sides of the slot (72) are connected with fasteners (73) at equal intervals. The outer sides of the slot (72) are connected with a transverse clip (74) at equal intervals. The outer sides of the transverse clip (74) are connected through the fasteners (73). The outer side of the outer cover shell (1) is provided with the outer side of the transverse clip (74) on the other side. The exhaust holes (75) are provided on one side of the outer cover shell (1) at equal intervals. The outer sealing strip (76) is distributed in a "U" shape at the inner end of the outer cover shell (1).

7. The dual-output lithium-ion battery charger equipped with a power balancing circuit according to claim 6, characterized in that: The outer cover shell (1) is fitted to both sides of the base (71) via an outer sealing strip (76) provided at the inner end.

8. The dual-output lithium-ion battery charger equipped with a cell balancing circuit according to claim 1, characterized in that: The heat dissipation mechanism (9) comprises a servo motor (91), an air guide cover (92), a fan blade (93), a power supply module (94), a paper filter element (95), a mesh plate (96) and a magnetic sheet (97). The servo motor (91) is installed inside the base (71). The output end shaft of the servo motor (91) is connected with the fan blade (93). The fan blade (93) is arranged inside the air guide cover (92). The air guide cover (92) is connected to the base (71). One side of the servo motor (91) is provided with a power supply module (94). The paper filter element (95) is symmetrically arranged inside the base (71). The paper filter element (95) is arranged just above the mesh plate (96). A plurality of magnetic sheets (97) are symmetrically arranged on the outside of the mesh plate (96). The mesh plate (96) is symmetrically arranged at the bottom end of the base (71).

9. The dual-output lithium-ion battery charger equipped with a cell balancing circuit according to claim 8, characterized in that: The mesh plate (96) is connected to the rectangular opening at the bottom end of the base (71) through a plurality of magnetic sheets (97) arranged at equal intervals on the outside.

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