Lithium ion battery charging device

Abstract

The invention relates to a lithium ion battery charging device, and relates to the technical field of battery charging, the lithium ion battery charging device comprises a shell, an alternating current interface is arranged on the side wall of the shell in a penetrating mode, and the live wire output end of the alternating current interface and the zero wire output end of the alternating current interface are jointly and electrically connected with a temperature control module; the ground wire output end of the alternating current interface and the output end of the temperature control module are jointly and electrically connected with a three-way switching power supply element, the temperature control module and the three-way switching power supply element are all located in the shell, the temperature control module is used for controlling on-off of mains supply, and the three-way switching power supply element is used for converting alternating current into direct current. The output end of the three-way switching power supply element is electrically connected with a plurality of direct-current busbars, the direct-current busbars are connected in parallel, the direct-current busbars are electrically connected with a plurality of charging modules, the charging modules are connected in parallel, the charging modules are connected with the direct-current busbars in an inserted mode, and the charging modules are used for charging a lithium battery. The method has the effect of reducing low-temperature charging of the lithium battery.

Description

Technical Field

[0001] This invention relates to the field of lithium battery charging technology, and in particular to a lithium-ion battery charging device. Background Technology

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. Due to their advantages such as large capacity, small size, and high safety, they are widely used in various fields. The application of lithium batteries is inseparable from the matching charging devices.

[0003] The related technology includes a Chinese patent with authorization announcement number CN218958593U, which provides a lithium battery charging device, including a charging box top cover and a charging box bottom shell. The upper side of the charging box bottom shell is provided with multiple external power charging ports for connecting an external power adapter. The lower side of the charging box bottom shell is provided with multiple charging ports for charging different types of batteries. A charging control board is provided between the charging box top cover and the charging box bottom shell. The external power charging ports and the charging ports are all connected to the charging control board.

[0004] In the process of developing this application, the inventors discovered that the technology has at least the following problems: when the temperature of the lithium battery charging environment is low, the lithium battery is prone to lithium plating, and forcibly charging the lithium battery under lithium plating conditions will cause the lithium battery to short-circuit and run away from control. Summary of the Invention

[0005] To reduce the need for lithium batteries to be charged in low-temperature environments, this application provides a lithium-ion battery charging device.

[0006] The lithium-ion battery charging device provided in this application adopts the following technical solution: A lithium-ion battery charging device includes a housing. An AC interface is provided through the side wall of the housing. The live wire output terminal and the neutral wire output terminal of the AC interface are electrically connected to a temperature control module. The ground wire output terminal of the AC interface and the output terminal of the temperature control module are electrically connected to a three-way switching power supply element. The temperature control module and the three-way switching power supply element are both located inside the housing. The temperature control module is used to control the on / off of the mains power. The three-way switching power supply element is used to convert AC power to DC power. The output terminals of the three-way switching power supply element are electrically connected to several DC busbars, which are connected in parallel. Several charging modules are electrically connected to the DC busbars, which are connected in parallel. The charging modules are plugged into the DC busbars and are used to charge the lithium battery.

[0007] By adopting the above technical solution, AC90~264V AC power is connected to the temperature control module and three-way switching power supply components through the AC interface. The temperature control module detects the ambient temperature, and when the ambient temperature is not lower than 5℃, it is determined to be in a normal state. The three-way switching power supply components adapt to the mains power fluctuations, converting the wide voltage range input AC90~264V, 47Hz~63Hz AC power into three independent and stable DC12V DC power outputs, enabling the charging module to charge the lithium battery. When any of the three switching power supply components fails, it does not affect the power supply of the other two. When a single charging module on the DC bus fails, it does not affect the other charging modules, achieving the effect of centralized power supply for multiple lithium battery modules. When the ambient temperature is lower than 5℃, it is determined to be a low temperature state. The temperature control module cuts off the power supply circuit of the three switching power supply components, preventing the charging module from charging the lithium battery and reducing the charging of lithium batteries in low-temperature environments.

[0008] Preferably, the temperature control module includes a power supply circuit, a detection circuit, a control circuit, and a switching circuit. The live wire output terminal and the neutral wire output terminal of the AC interface are both electrically connected to the input terminal of the power supply circuit. The power supply circuit is used to output AC and DC power. The power input terminals of the detection circuit and the control circuit are both electrically connected to the DC output terminal of the power supply circuit. The signal output terminal of the detection circuit is electrically connected to the signal input terminal of the control circuit. The detection circuit is used to acquire temperature and output digital signals. The control circuit is used to output level signals. The switching circuit is electrically connected between the three switching power supply components and the AC output terminal of the power supply circuit. The signal output terminal of the control circuit is connected to the signal input terminal of the switching circuit. The switching circuit is used to switch the three switching power supply components and the power supply circuit on and off according to the level signal.

[0009] Preferably, the power supply circuit includes a first fuse, a varistor, a first capacitor, a first inductor, a common-mode inductor, a second capacitor, a rectifier bridge element, a third capacitor, a first Zener diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a switching element. The varistor has a diameter of 10mm, a varistor voltage of 560V, and a tolerance of ±10%. The first inductor has an inductance of 4.7uH, and both the first and second capacitors have a capacitance of 0.1uF. The rated AC voltage of the first capacitor and the rated AC voltage of the second capacitor are specified. The AC voltage is 275V. The common-mode inductor is model FL2D-10-222, the rectifier bridge is model LD05-20B12, the third capacitor has a capacitance of 220uF, the fourth capacitor has a capacitance of 10uF and a rated voltage of 50V, the fifth and sixth capacitors both have a capacitance of 100nF and a rated voltage of 25V, the switching element is model LM1117S-3.3(MS), and one end of the first fuse is connected to the power supply circuit. The input terminal of the common-mode inductor is connected to the AC output terminal of the power supply circuit. The other end of the first fuse is the AC output terminal of the power supply circuit. One end of the first inductor, one end of the varistor, and one end of the first capacitor are all electrically connected to the AC output terminal of the power supply circuit. The other ends of the varistor and the first capacitor are both electrically connected to the neutral output terminal of the AC interface. The input terminal of the first coil of the common-mode inductor is electrically connected to the end of the first inductor furthest from the first fuse. The input terminal of the second coil of the common-mode inductor is electrically connected to the neutral output terminal of the AC interface. The output terminal of the first coil and one end of the second capacitor of the common-mode inductor are both connected to the pins of the rectifier bridge components. 2. Electrical Connections: The output terminal of the second coil in the common-mode inductor and the other end of the second capacitor are both electrically connected to pin 1 of the rectifier bridge element. Pin 3 of the rectifier bridge element, one end of the third capacitor, the negative terminal of the first Zener diode, one end of the fourth capacitor, one end of the fifth capacitor, one end of the sixth capacitor, and pin 3 of the switching element are electrically connected. Pin 4 of the rectifier bridge element, the other end of the third capacitor, the positive terminal of the first Zener diode, the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the sixth capacitor, and pin 1 of the switching element are all grounded. Pin 2 of the switching element is electrically connected to the power input terminal of the detection circuit.

[0010] By adopting the above technical solution, the mains power is first filtered by the first fuse, varistor, first capacitor, first inductor and common mode inductor, and then filtered by the rectifier bridge element and the second capacitor to obtain a stable 12V DC power. The 12V DC power is then filtered by the third capacitor, the first Zener diode, the fourth capacitor, the fifth capacitor, the sixth capacitor and the switching element to obtain a 3.3V low voltage power supply.

[0011] Preferably, the detection circuit includes a detection element and a third resistor. The detection element is a DS18B20, and the third resistor has a resistance of 4.7KΩ. Pin 1 of the detection element is grounded, pin 2 of the detection element is the signal output terminal of the detection circuit, pin 3 of the detection element is electrically connected to pin 2 of the switching element, one end of the third resistor is connected to pin 2 of the detection element, and the other end of the third resistor is connected to a 3.3V power supply.

[0012] By adopting the above technical solution, the DS18B20 digital temperature sensor integrates temperature acquisition, A / D conversion and storage functions. The third resistor ensures that pin 2 of the sensing element is at a high level when idle, so as to ensure stable signal transmission and input the digital temperature value into the control circuit to complete the temperature data interaction.

[0013] Preferably, the power supply circuit further includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a fifth Zener diode. The seventh capacitor has a capacitance of 10uF, the eighth, ninth, tenth, and eleventh capacitors each have a capacitance of 100nF, and the twelfth capacitor has a capacitance of 220uF. One end of the seventh capacitor, one end of the eighth capacitor, one end of the ninth capacitor, one end of the tenth capacitor, one end of the eleventh capacitor, and one end of the twelfth capacitor, along with the negative terminal of the fifth Zener diode, are electrically connected to a filter wire. One end of the filter wire is electrically connected to pin 2 of the switching element, and the other end of the filter wire is electrically connected to the power input terminal of the control circuit. The other ends of the seventh capacitor, the eighth capacitor, the ninth capacitor, the tenth capacitor, the eleventh capacitor, the twelfth capacitor, and the positive terminal of the fifth Zener diode are all grounded.

[0014] By adopting the above technical solution, the seventh capacitor, eighth capacitor, ninth capacitor, tenth capacitor C10, eleventh capacitor, twelfth capacitor and fifth Zener diode filter the current, stabilize the working voltage and suppress high-frequency noise.

[0015] Preferably, the control circuit includes a control element, a fifth resistor, a sixth resistor, and a light-emitting diode (LED). The control element is an STM32F030. The resistance values ​​of the fifth and sixth resistors are both 1KΩ. Pin 1 of the control element is electrically connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded. Pin 4 of the control element is electrically connected to a reset circuit. Pin 6 of the control element is the signal output terminal of the control circuit and is electrically connected to the signal input terminal of the switching circuit. Pin 13 of the control element is electrically connected to one end of the fifth resistor, and the other end of the fifth resistor is electrically connected to the positive terminal of the LED. The negative terminal of the LED is grounded. Pin 14 of the control element is the signal input terminal of the control circuit. Pin 15 of the control element is grounded. Pin 16 of the control element is electrically connected to the end of the filter wire away from the switching element. Pins 19 and 20 of the control element are connected to a debugging circuit.

[0016] By adopting the above technical solution, when the circuit power supply is normal, pin 13 of the control element outputs a high level, controlling the current through the fifth resistor to light up the LED, providing direct feedback on the system power-on status. The STM32F030 chip sends a reset pulse to the detection element, which responds to complete bus initialization and starts temperature acquisition and A / D conversion. After conversion, the MCU reads the temperature data in the detection element's register, converts it into the actual temperature value, and compares the read temperature with 5℃. When the read temperature is not lower than 5℃, it outputs a high level; when the read temperature is lower than 5℃, it outputs a low level.

[0017] Preferably, the reset circuit includes a reset element, a ninth resistor, a twentieth capacitor, and a twenty-first capacitor. The reset element is model APX809S-29SA-7. The ninth resistor has a resistance of 10KΩ, and the twentieth and twenty-first capacitors both have a capacitance of 0.1uF. Pin 1 of the reset element is grounded. Pin 4 of the control element, one end of the ninth resistor, and one end of the twenty-first capacitor are all electrically connected to pin 2 of the reset element. The other end of the ninth resistor is electrically connected to the end of the filter wire furthest from the switching element, and the other end of the twenty-first capacitor is grounded. One end of the twentieth capacitor and pin 3 of the reset element are electrically connected to the end of the filter wire away from the switching element, and the other end of the twentieth capacitor is grounded; the debugging circuit includes a JTAG interface and a fourth resistor with a resistance of 5.1KΩ. Pin 1 of the JTAG interface is electrically connected to the end of the filter wire away from the switching element, pin 2 of the JTAG interface is grounded, pin 4 of the JTAG interface is electrically connected to pin 20 of the control element, pin 5 of the JTAG interface and one end of the fourth resistor are both electrically connected to pin 19 of the control element, and the other end of the fourth resistor is grounded.

[0018] By adopting the above technical solution, the JTAG interface is used for program downloading and debugging.

[0019] Preferably, a start switch is connected in series at the end of the first fuse away from the first inductor, and a fuse is connected in series at the end of the start switch away from the first fuse. The end of the fuse away from the start switch is electrically connected to the live wire output terminal of the AC interface.

[0020] By adopting the above technical solution, the start switch is a rocker switch with a self-locking function. When the start switch is closed, the mains power is connected to the temperature control module through the fuse and the start switch. When the mains power is overcurrent, the fuse blows, cutting off the mains power protection downstream circuit.

[0021] Preferably, the switching circuit includes a first relay, a seventh resistor, a third diode, a forced switch, and a second relay. The first relay is model GAQY212GSX, and the second relay is model SRD-12VDC-SL-C. Pin 1 of the first relay is the signal input terminal of the switching circuit. Pin 2 of the first relay is electrically connected to one end of the seventh resistor. The other end of the seventh resistor and pin 4 of the first relay are both grounded. Pin 3 of the first relay and the positive terminal of the third diode are both electrically connected to pin 4 of the second relay. The negative terminal of the third diode and pin 1 of the second relay are both connected to a 12V power supply. Pin 5 of the second relay and one end of the forced switch are both electrically connected to a three-way switching power supply component. Pin 2 of the second relay and the other end of the forced switch are both electrically connected to the AC output terminal of the circuit power supply.

[0022] By adopting the above technical solution, when the control element outputs a high level, the second relay contact closes, and the mains power supplies the three-way switching power supply element. When the control element outputs a low level, the second relay contact opens, cutting off the power supply circuit of the three-way switching power supply element. When the control element outputs a low level and the forced switch closes, the mains power supplies the three-way switching power supply element.

[0023] Preferably, the charging module includes a charging shell, a charging control board, several charging interfaces, a first power supply interface, a second power supply interface, and a third power supply interface. The charging interfaces are located on the top of the charging shell. An indicator light is connected in series between the charging interface and the output terminal of the charging control board. The indicator light is located on the charging shell. The charging control board is located inside the charging shell. The output terminals of the first, second, and third power supply interfaces are all electrically connected to the input terminal of the charging control board. The first power supply interface is located at the bottom of the charging shell and is used to engage with a DC busbar. The second and third power supply interfaces are located on the side wall of the charging shell. The second power supply interface is a DC5521 input interface, and the third power supply interface is a Type-C input interface. A protective layer is provided on the outer wall of the charging shell.

[0024] By adopting the above technical solution, the charging shell is made of PA66+30% glass fiber material; the charging interface forms a charging channel for four 18650 lithium batteries; the indicator light shows the current status of the battery; the charging shell and the charging control board are assembled with bolts; the charging module is connected in parallel to the DC busbar through the first power supply interface to achieve quick plugging and unplugging; the second power supply interface and the third power supply interface are used to connect to an external DC power source; the protective layer protects the charging control board; and the transparent shell protects the lithium battery.

[0025] Preferably, the housing has a panel with several slots and several snap-fit ​​grooves extending through it. The slots are for inserting the charging module, and the protective layers are used to abut against the inner wall of the slots. Several horizontal elastic blocks are fixedly provided on the side wall of the charging housing. A vertical elastic block is fixedly provided at the end of the horizontal elastic block away from the side wall of the charging module. The vertical elastic block is used to insert into the snap-fit ​​groove. A pressing block and an abutting block are fixedly provided on the side of the vertical elastic block away from the charging module. The pressing block is located above the abutting block, and the outer wall of the abutting block is used to fit against the inner wall of the snap-fit ​​groove. A transparent shell is detachably provided on the top of the charging housing, and the transparent shell covers the charging interface.

[0026] By adopting the above technical solution, the slots on the panel adopt a matrix layout design. The panel is made of 5052 aluminum alloy and the surface of the panel is anodized. The slot size is 80mm×100mm, and the spacing between adjacent slots is 30mm. The horizontal and vertical elastic blocks are made of PA66+30% glass fiber. When the panel and the charging module are engaged, the charging module is inserted into the slot, and the protective layer is attached to the inner wall of the slot. At the same time, the user applies pressure to the pressing block to slightly deform the vertical elastic block, so that the abutment block is inserted into the slot until the first power supply port is engaged with the I-shaped pin on the DC bus. After that, the user releases the pressing block, and the outer wall of the abutment block is attached to the inner wall of the slot. When a charging module fails, the user applies pressure to the pressing block to slightly deform the vertical elastic block and pull the charging module out of the slot, which facilitates the maintenance and replacement of the charging module without affecting the use of other charging modules.

[0027] Preferably, the bottom of the charging case is detachably provided with an expansion base, and several snap-fit ​​plates are fixedly provided on the expansion base. Snap-fit ​​holes are provided through the snap-fit ​​plates for inserting vertical elastic blocks and abutment blocks. A silicone gasket is fitted on the protective layer, with the top of the silicone gasket tightly fitting against the bottom of the charging case and the bottom of the silicone gasket tightly fitting against the top of the expansion base.

[0028] By adopting the above technical solution, in order to make the charging module work independently, after pulling the charging module out of the slot, insert the charging module into the expansion socket, so that the protective layer fits against the inner wall of the expansion socket. At the same time, the user applies pressure to the pressing block to slightly deform the vertical elastic block, so that the abutment block is inserted into the snap-fit ​​hole. After the silicone gasket fits tightly against the expansion socket, the pressing block is released, and the charging module and the expansion socket are assembled in place.

[0029] Preferably, the housing includes an upper shell and a lower shell, the upper shell and the lower shell are detachably connected, the AC interface is disposed through the lower shell, and a handle is fixedly provided on the side wall of the lower shell.

[0030] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a housing, AC interface, temperature control module, three-way switching power supply components, DC bus and charging module, the charging of lithium batteries in low temperature environment is reduced. The circuit topology of the charging device is designed as a complete charging system of "mains input - temperature control - AC / DC conversion - power supply for multiple charging modules", so as to achieve the effect of centralized power supply for multiple lithium battery modules. 2. By setting up a power supply circuit, detection circuit, control circuit and switching circuit, when the ambient temperature is not lower than 5℃, it is determined to be in normal state, and the temperature control module connects the power supply circuit of the three switching power supply components in the circuit. When the ambient temperature is lower than 5℃, it is determined to be in low temperature state, and the temperature control module disconnects the power supply circuit of the three switching power supply components in the circuit. 3. By setting up a charging shell, charging control board, charging interface, indicator light, first power supply interface, second power supply interface, third power supply interface, transparent shell, protective layer, silicone gasket, panel, slot, snap-fit ​​slot, vertical elastic block, horizontal elastic block, pressing block, abutment block, expansion base, snap-fit ​​plate and snap-fit ​​hole, the charging module can be quickly disassembled, improving the maintenance efficiency of the charging module and expanding the application scenarios of the charging module. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a lithium-ion battery charging device according to an embodiment of this application.

[0032] Figure 2 This is a schematic diagram illustrating the positional relationship between the temperature control module and the three-way switching power supply components in the embodiments of this application.

[0033] Figure 3 This is a schematic diagram illustrating the positional relationship between the charging module and the panel in an embodiment of this application.

[0034] Figure 4 yes Figure 3 Enlarged view of part A in the middle.

[0035] Figure 5 This is a schematic diagram illustrating the connection relationship between the charging case and the expansion dock in an embodiment of this application.

[0036] Figure 6 This is a schematic diagram illustrating the connection relationship between the charging case and the first power supply interface in an embodiment of this application.

[0037] Figure 7 This is a circuit diagram of a lithium-ion battery charging device according to an embodiment of this application.

[0038] Figure 8 This is a circuit diagram of the temperature control module in an embodiment of this application.

[0039] Figure 9 This is a circuit diagram of the power supply circuit in an embodiment of this application.

[0040] Figure 10 This is a circuit diagram of the detection circuit in an embodiment of this application.

[0041] Figure 11 This is a circuit diagram of the control circuit in an embodiment of this application.

[0042] Figure 12 This is a circuit diagram of the reset circuit and the debugging circuit in the embodiments of this application.

[0043] Figure 13 This is a circuit diagram of the switching circuit in an embodiment of this application.

[0044] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Upper housing; 12. Lower housing; 13. AC interface; 16. Handle; 2. Temperature control module; 3. Three-way switching power supply component; 4. DC busbar; 41. Positive busbar; 42. Negative busbar; 5. Charging module; 51. Charging shell; 52. Charging control board; 53. Charging interface; 531. Indicator light; 54. First power supply interface; 55. Second power supply interface; 56. Third power supply interface; 57. Transparent shell; 58. Protective layer; 59. Silicone gasket; 6. Panel; 61. Slot; 62. Snap-fit ​​slot; 7. Vertical elastic block; 71. Horizontal elastic block; 72. Pressing block; 73. Abutment block; 8. Expansion base; 81. Snap-fit ​​plate; 82. Snap-fit ​​hole. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1-13 This application will be described in further detail.

[0046] This application discloses a lithium-ion battery charging device. (Refer to...) Figure 1 The system includes a housing 1, which consists of an upper shell 11 and a lower shell 12, connected by fasteners and hinges. Both the upper shell 11 and the lower shell 12 are made of 3mm thick cold-rolled steel sheet with a powder-coated surface. A handle 16 is installed on the side wall of the lower shell 12, and louvered ventilation holes are provided through the side wall. A fan is also installed on the side wall of the lower shell 12, which automatically operates to dissipate heat when the ambient temperature is high.

[0047] Reference Figure 1 and Figure 2 An AC interface 13 is provided through the lower shell 12. The live wire output terminal and the neutral wire output terminal of the AC interface 13 are electrically connected to the temperature control module 2. The temperature control module 2 is located inside the shell 1 and is used to control the on / off of the mains power.

[0048] refer to Figure 1 and Figure 2 The ground output terminal of AC interface 13 and the output terminal of temperature control module 2 are electrically connected to the three-way switching power supply element 3. The three-way switching power supply element 3 is fixed to a preset mounting position inside the lower shell 12 by screws. The three-way switching power supply element 3 is used to convert AC power to DC power. The three-way switching power supply element 3 adopts an LLC resonant topology. The three-way switching power supply element 3 has a single output of DC12V / 15A, a total output power of 540W, and a conversion efficiency of ≥90% at full load. The three-way switching power supply element 3 adapts to mains power fluctuations and converts AC power with a wide voltage range of input (AC90~264V, 47Hz~63Hz) into three independent and stable DC12V outputs.

[0049] refer to Figure 1 and Figure 2Each of the three switching power supply components 3 has several DC busbars 4 electrically connected to its output terminal via Schottky diodes. The DC busbars 4 are connected in parallel. The Schottky diodes provide backflow protection; when one circuit fails, the Schottky diodes automatically cut off the faulty circuit, while the other two circuits continue to be powered.

[0050] refer to Figure 2 and Figure 3 The DC busbar 4 is made of tin-plated copper and electrically connects several charging modules 5. The charging modules 5 are connected in parallel and plugged into the DC busbar 4. The charging modules 5 are used to charge the lithium battery. Each charging module 5 has a built-in independent charging management IC that automatically matches the charging curve according to the battery voltage for adaptive charging. The charging modules 5 have a status feedback function, reporting data such as voltage, current, and temperature to the main control chip via a communication interface for intelligent management.

[0051] refer to Figure 2 and Figure 3 The DC busbar 4 includes a positive busbar 41 and a negative busbar 42, which are fixed to the lower housing 12 at preset mounting positions by insulating brackets. The positive busbar 41 is provided with a vertically bent, straight-line positive pin, and the negative busbar 42 is provided with a vertically bent, straight-line negative pin. Both the straight-line positive and negative pins are used for connection and engagement with the charging module 5.

[0052] refer to Figures 3 to 6The charging module 5 includes a charging housing 51, a charging control board 52, several charging interfaces 53, a first power supply interface 54, a second power supply interface 55, and a third power supply interface 56. The charging housing 51 is made of PA66 + 30% glass fiber material. The charging interfaces 53 form a charging channel for four 18650 lithium batteries and are located on the top of the charging housing 51. An indicator light 531 is connected in series between the charging interfaces 53 and the output terminal of the charging control board 52. The indicator light 531 is located on the charging housing 51 and indicates the current battery status. The charging control board 52 is located inside the charging housing 51, and the charging housing 51 and the charging control board 52 are assembled with bolts. The output terminals of the first power supply interface 54, the second power supply interface 55, and the third power supply interface 56 are all electrically connected to the input terminal of the charging control board 52. The first power supply interface 54 is located at the bottom of the charging housing 51 and is used to engage with the DC bus 4, enabling quick insertion and removal of the charging module 5 from the DC bus 4. The second power supply interface 55 and the third power supply interface 56 are located on the side wall of the charging case 51. The second power supply interface 55 is a DC5521 input interface, and the third power supply interface 56 is a Type-C input interface. Both interfaces are used to connect to an external DC power source. A protective layer 58 is provided on the outer wall of the charging case 51 to protect the charging control board 52. A transparent shell 57 is detachably installed on the top of the charging case 51, covering the charging interface 53. The transparent shell 57 protects the lithium battery.

[0053] refer to Figures 3 to 6A panel 6 is installed inside the housing 1. The panel 6 is made of 5052 aluminum alloy and has an anodized surface. Several slots 61 and several snap-fit ​​grooves 62 are formed through the panel 6. The slots 61 on the panel 6 adopt a matrix layout design, with each slot measuring 80mm × 100mm and a spacing of 30mm between adjacent slots. The slots 61 are for inserting the charging module 5, and the protective layer 58 is used to abut against the inner wall of the slot 61. Several horizontal elastic blocks 71 are installed on the side wall of the charging housing 51. A vertical elastic block 7 is integrally formed at the end of the horizontal elastic blocks 71 away from the side wall of the charging module 5. Both the horizontal elastic blocks 71 and the vertical elastic blocks 7 are made of PA66 + 30% glass fiber. The vertical elastic block 7 is used to insert into the snap-fit ​​groove 62. A pressing block 72 and an abutting block 73 are installed on the side of the vertical elastic block 7 away from the charging module 5. The pressing block 72 is located above the abutting block 73, and the outer wall of the abutting block 73 is used to fit against the inner wall of the snap-fit ​​groove 62. When the panel 6 and charging module 5 are engaged, the charging module 5 is inserted into the slot 61, and the protective layer 58 is in contact with the inner wall of the slot 61. At the same time, the user applies pressure to the pressing block 72, causing the vertical elastic block 7 to deform slightly, so that the abutment block 73 is inserted into the locking groove 62 until the first power supply port engages with the straight pin on the DC busbar 4. After that, the user releases the pressing block 72, and the outer wall of the abutment block 73 is in contact with the inner wall of the locking groove 62. When a charging module 5 malfunctions, the user applies pressure to the pressing block 72, causing the vertical elastic block 7 to deform slightly, and pulls the charging module 5 out of the slot 61, which facilitates the maintenance and replacement of the charging module 5 without affecting the use of other charging modules 5.

[0054] refer to Figures 3 to 6 The bottom of the charging case 51 is detachably equipped with an expansion seat 8, which is made of PA66 + 30% glass fiber material. Several snap-fit ​​plates 81 are installed on the expansion seat 8, with snap-fit ​​holes 82 extending through them for the vertical elastic block 7 and the abutment block 73 to be inserted. A silicone gasket 59 is fitted onto the protective layer 58, with its top tightly fitting the bottom of the charging case 51 and its bottom for a tight fit with the top of the expansion seat 8. To allow the charging module 5 to be used independently, after removing the charging module 5 from the slot 61, insert it into the expansion seat 8, ensuring the protective layer 58 fits against the inner wall of the expansion seat 8. Simultaneously, the user applies pressure to the pressing block 72, causing a slight deformation of the vertical elastic block 7, allowing the abutment block 73 to insert into the snap-fit ​​hole 82. The pressing block 72 is released after the silicone gasket 59 and the expansion seat 8 are tightly fitted, thus assembling the charging module 5 into the expansion seat 8.

[0055] Reference Figure 7 and Figure 8The temperature control module 2 includes a power supply circuit, a detection circuit, a control circuit, and a switching circuit. The live wire output terminal and the neutral wire output terminal of the AC interface 13 are both electrically connected to the input terminal of the power supply circuit, which outputs both AC and DC power. The power input terminals of the detection circuit and the control circuit are both electrically connected to the DC output terminal of the power supply circuit. The signal output terminal of the detection circuit is electrically connected to the signal input terminal of the control circuit. The detection circuit is used to acquire temperature and output digital signals, while the control circuit is used to output level signals. The switching circuit is electrically connected between the three-way switching power supply element 3 and the AC output terminal of the power supply circuit. The signal output terminal of the control circuit is connected to the signal input terminal of the switching circuit. The switching circuit is used to switch the three-way switching power supply element 3 and the power supply circuit on and off according to the level signal.

[0056] Reference Figures 7 to 9 The power supply circuit includes a first fuse R1, a varistor R2, a first capacitor C1, a first inductor L1, a common-mode inductor L2, a second capacitor C2, a rectifier bridge element U3, a third capacitor C3, a first Zener diode D1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a switching element U7, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, and a fifth Zener diode D5. The varistor R2 has a diameter of 10mm, a varistor voltage of 560V, and an error rating of ±10%. The first inductor L1 has an inductance of 4.7uH. The first capacitor C1 and the second capacitor C2 both have a capacitance of 0.1uF. The rated AC voltage of the first capacitor C1 and the second capacitor C2 are both 275V. The common-mode inductor L2 is model FL2D-10-222. The rectifier bridge component U3 is model LD05-20B12. The third capacitor C3 has a capacitance of 220uF. The fourth capacitor C4... The capacitance value is 10uF. The rated voltage of the fourth capacitor C4 is 50V. The capacitance values ​​of the fifth capacitor C5 and the sixth capacitor C6 are both 100nF. The rated voltage of the fifth capacitor C5 and the sixth capacitor C6 are both 25V. The model of the switching element U7 is LM1117S-3.3(MS). The capacitance value of the seventh capacitor C7 is 10uF. The capacitance values ​​of the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 are all 100nF. The capacitance value of the twelfth capacitor C12 is 220uF.

[0057] Reference Figures 7 to 9One end of the first fuse R1 is the input terminal of the power supply circuit, and the other end of the first fuse R1 is the AC output terminal of the power supply circuit. A start switch, which is a rocker switch with a self-locking function, is connected in series at the input terminal of the power supply circuit. A fuse is connected in series at the end of the start switch away from the first fuse R1, and the end of the fuse away from the start switch is electrically connected to the live wire output terminal of the AC interface 13. When the start switch is closed, the mains power is supplied to the temperature control module 2 via the fuse and the start switch. When the mains power is overcurrent, the fuse blows, cutting off the mains power and protecting the subsequent circuit. One end of the first inductor L1, one end of the varistor R2, and one end of the first capacitor C1 are all electrically connected to the AC output terminal of the power supply circuit, and the other ends of the varistor R2 and the first capacitor C1 are both electrically connected to the neutral wire output terminal of the AC interface 13. The input terminal of the first coil in the common-mode inductor L2 is electrically connected to the end of the first inductor L1 away from the first fuse R1. The input terminal of the second coil in the common-mode inductor L2 is electrically connected to the neutral output terminal of the AC interface 13. The output terminal of the first coil in the common-mode inductor L2 and one end of the second capacitor C2 are both electrically connected to pin 2 of the rectifier bridge element U3. The output terminal of the second coil in the common-mode inductor L2 and the other end of the second capacitor C2 are both electrically connected to pin 1 of the rectifier bridge element U3. Pin 3 of rectifier bridge component U3, one end of third capacitor C3, the negative terminal of first Zener diode D1, one end of fourth capacitor C4, one end of fifth capacitor C5, one end of sixth capacitor C6, and pin 3 of switching component U7 are electrically connected. Pin 4 of rectifier bridge component U3, the other end of third capacitor C3, the positive terminal of first Zener diode D1, the other end of fourth capacitor C4, the other end of fifth capacitor C5, the other end of sixth capacitor C6, and pin 1 of switching component U7 are all grounded. Pin 2 of switching component U7 is electrically connected to the power input terminal of the detection circuit. The mains power is first filtered by first fuse R1, varistor R2, first capacitor C1, first inductor L1, and common-mode inductor L2, and then filtered by rectifier bridge component U3 and second capacitor C2 to obtain a stable 12V DC power. The 12V DC power is then passed through third capacitor C3, first Zener diode D1, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, and switching component U7 to obtain a 3.3V low-voltage power supply.

[0058] Reference Figures 7 to 9One end of the seventh capacitor C7, one end of the eighth capacitor C8, one end of the ninth capacitor C9, one end of the tenth capacitor C10, one end of the eleventh capacitor C11, one end of the twelfth capacitor C12, and the negative terminal of the fifth Zener diode D5 are electrically connected to a filter wire. One end of the filter wire is electrically connected to pin 2 of the switching element U7, and the other end of the filter wire is electrically connected to the power input terminal of the control circuit. The other ends of the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, and the positive terminal of the fifth Zener diode D5 are all grounded. The seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12, and the fifth Zener diode D5 filter the current, stabilize the operating voltage, and suppress high-frequency noise.

[0059] Reference Figures 7 to 10 The detection circuit includes a detection element U2 and a third resistor R3. The detection element U2 is a DS18B20, and the resistance of the third resistor R3 is 4.7KΩ. Pin 1 of the detection element U2 is grounded, pin 2 is the signal output terminal of the detection circuit, pin 3 of the detection element U2 is electrically connected to pin 2 of the switching element U7, one end of the third resistor R3 is connected to pin 2 of the detection element U2, and the other end of the third resistor R3 is connected to a 3.3V power supply. The DS18B20 digital temperature sensor integrates temperature acquisition, A / D conversion, and storage functions. The third resistor R3 ensures that pin 2 of the detection element U2 is at a high level when idle, enabling stable signal transmission and inputting the digital temperature value into the control circuit to complete the temperature data interaction.

[0060] Reference Figures 7 to 11The control circuit includes a control element U1, a fifth resistor R5, a sixth resistor R6, and an LED D4. Control element U1 is an STM32F030. The resistance of both resistors R5 and R6 is 1KΩ. Pin 1 of control element U1 is electrically connected to one end of resistor R6, and the other end of resistor R6 is grounded. Pin 4 of control element U1 is electrically connected to the reset circuit. Pin 6 of control element U1 is the signal output terminal of the control circuit and is electrically connected to the signal input terminal of the switching circuit. Pin 13 of control element U1 is electrically connected to one end of resistor R5, and the other end of resistor R5 is electrically connected to the positive terminal of LED D4, while the negative terminal of LED D4 is grounded. Pin 14 of control element U1 is the signal input terminal of the control circuit. Pin 15 of control element U1 is grounded. Pin 16 of control element U1 is electrically connected to the end of the filter wire furthest from the switching element U7. The debugging circuit is connected to pins 19 and 20 of control element U1. When the circuit is powered normally, pin 13 of control element U1 outputs a high level, controlling the current through the fifth resistor R5 to light up the LED D4, providing direct feedback on the system's power-on status. The STM32F030 chip sends a reset pulse to detection element U2, which responds to complete bus initialization and starts temperature acquisition and A / D conversion. After conversion, the MCU reads the temperature data in the temporary register of detection element U2, converts it into the actual temperature value, compares the read temperature with 5℃, outputs a high level when the read temperature is not lower than 5℃, and outputs a low level when the read temperature is lower than 5℃.

[0061] Reference Figures 7 to 12 The reset circuit includes a reset element U6, a ninth resistor R9, a twentieth capacitor C20, and a twenty-first capacitor C21. The reset element U6 is model APX809S-29SA-7. The resistance of the ninth resistor R9 is 10KΩ. The capacitances of the twentieth capacitor C20 and the twenty-first capacitor C21 are both 0.1uF. Pin 1 of the reset element U6 is grounded. Pin 4 of the control element U1, one end of the ninth resistor R9, and one end of the twenty-first capacitor C21 are all electrically connected to pin 2 of the reset element U6. The other end of the ninth resistor R9 is electrically connected to the end of the filter wire furthest from the switching element U7. The other end of the twenty-first capacitor C21 is grounded. One end of the twentieth capacitor C20 and pin 3 of the reset element U6 are both electrically connected to the end of the filter wire furthest from the switching element U7. The other end of the twenty-first capacitor C21 is grounded.

[0062] Reference Figures 7 to 12The debugging circuit includes a JTAG interface and a fourth resistor R4 with a resistance of 5.1KΩ. Pin 1 of the JTAG interface is electrically connected to the end of the filter wire furthest from the switching element U7. Pin 2 of the JTAG interface is grounded. Pin 4 of the JTAG interface is electrically connected to pin 20 of the control element U1. Pin 5 of the JTAG interface and one end of the fourth resistor R4 are both electrically connected to pin 19 of the control element U1. The other end of the fourth resistor R4 is grounded.

[0063] Reference Figures 7 to 13 The switching circuit includes a first relay U10, a seventh resistor R7, a third diode D3, a forced switch U8, and a second relay. The first relay U10 is model GAQY212GSX, and the second relay is model SRD-12VDC-SL-C. Pin 1 of the first relay U10 is the signal input terminal of the switching circuit. Pin 2 of the first relay U10 is electrically connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 and pin 4 of the first relay U10 are both grounded. Pin 3 of the first relay U10 and the positive terminal of the third diode D3 are both electrically connected to pin 4 of the second relay. The negative terminal of the third diode D3 and pin 1 of the second relay are both connected to a 12V power supply. Pin 5 of the second relay and one end of the forced switch U8 are both electrically connected to the three-way switching power supply element 3, and pin 2 of the second relay and the other end of the forced switch U8 are both electrically connected to the AC output terminal of the circuit power supply. When the control element U1 outputs a high level, the second relay contact closes, and the mains power supplies the three-way switching power supply element 3; when the control element U1 outputs a low level, the second relay contact opens, cutting off the power supply circuit of the three-way switching power supply element 3; when the control element U1 outputs a low level and the forced switch U8 closes, the mains power supplies the three-way switching power supply element 3.

[0064] The implementation principle of a lithium-ion battery charging device according to an embodiment of this application is as follows: AC power is connected to a temperature control module 2 and a three-way switching power supply element 3 through an AC interface 13. The temperature control module 2 detects the ambient temperature. When the ambient temperature is not lower than 5°C, it is determined to be in a normal state; when the ambient temperature is lower than 5°C, it is determined to be in a low-temperature state. The temperature control module 2 cuts off the power supply circuit of the three-way switching power supply element 3, preventing the charging module 5 from receiving power to charge the lithium battery, thus reducing the possibility of the lithium battery charging in a low-temperature environment. When any of the three-way switching power supply elements 3 fails, it does not affect the power supply of the other two. When a single charging module 5 on the DC bus 4 fails, it does not affect the other charging modules 5, achieving the effect of centralized power supply for multiple lithium battery modules.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lithium-ion battery charging device, comprising a housing, wherein an AC interface is provided through the side wall of the housing, characterized in that: The live wire output terminal and the neutral wire output terminal of the AC interface are electrically connected to a temperature control module. The ground wire output terminal of the AC interface and the output terminal of the temperature control module are electrically connected to a three-way switching power supply element. The temperature control module and the three-way switching power supply element are both located inside the housing. The temperature control module is used to control the on / off state of the mains power. The three-way switching power supply element is used to convert AC power to DC power. The output terminals of the three-way switching power supply element are electrically connected to several DC busbars, which are connected in parallel. Several charging modules are electrically connected to the DC busbars, which are connected in parallel. The charging modules are plugged into the DC busbars and are used to charge the lithium battery.

2. The lithium-ion battery charging device according to claim 1, characterized in that: The temperature control module includes a power supply circuit, a detection circuit, a control circuit, and a switching circuit. The live wire output terminal and the neutral wire output terminal of the AC interface are both electrically connected to the input terminal of the power supply circuit. The power supply circuit is used to output AC and DC power. The power input terminals of the detection circuit and the control circuit are both electrically connected to the DC output terminal of the power supply circuit. The signal output terminal of the detection circuit is electrically connected to the signal input terminal of the control circuit. The detection circuit is used to acquire temperature and output digital signals. The control circuit is used to output level signals. The switching circuit is electrically connected between the three switching power supply components and the AC output terminal of the power supply circuit. The signal output terminal of the control circuit is connected to the signal input terminal of the switching circuit. The switching circuit is used to switch the three switching power supply components and the power supply circuit on and off according to the level signal.

3. A lithium-ion battery charging device according to claim 2, characterized in that: The power supply circuit includes a first fuse, a varistor, a first capacitor, a first inductor, a common-mode inductor, a second capacitor, a rectifier bridge element, a third capacitor, a first Zener diode, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a switching element. The varistor has a diameter of 10mm, a varistor voltage of 560V, and a tolerance of ±10%. The first inductor has an inductance of 4.7uH. The first and second capacitors both have a capacitance of 0.1uF. The rated AC voltage of the first and second capacitors are... All are 275V. The common-mode inductor is model FL2D-10-222, the rectifier bridge is model LD05-20B12, the third capacitor has a capacitance of 220uF, the fourth capacitor has a capacitance of 10uF and a rated voltage of 50V, the fifth and sixth capacitors both have a capacitance of 100nF and a rated voltage of 25V, the switching element is model LM1117S-3.3(MS), and one end of the first fuse is the power circuit input. The first fuse has one end that is the AC output terminal of the power supply circuit. One end of the first inductor, one end of the varistor, and one end of the first capacitor are all electrically connected to the AC output terminal of the power supply circuit. The other ends of the varistor and the first capacitor are both electrically connected to the neutral output terminal of the AC interface. The input terminal of the first coil of the common-mode inductor is electrically connected to the end of the first inductor furthest from the first fuse. The input terminal of the second coil of the common-mode inductor is electrically connected to the neutral output terminal of the AC interface. The output terminal of the first coil and one end of the second capacitor of the common-mode inductor are both connected to pin 2 of the rectifier bridge element. Electrically connected, the output terminal of the second coil in the common-mode inductor and the other end of the second capacitor are both electrically connected to pin 1 of the rectifier bridge element. Pin 3 of the rectifier bridge element, one end of the third capacitor, the negative terminal of the first Zener diode, one end of the fourth capacitor, one end of the fifth capacitor, one end of the sixth capacitor, and pin 3 of the switching element are electrically connected. Pin 4 of the rectifier bridge element, the other end of the third capacitor, the positive terminal of the first Zener diode, the other end of the fourth capacitor, the other end of the fifth capacitor, the other end of the sixth capacitor, and pin 1 of the switching element are all grounded. Pin 2 of the switching element is electrically connected to the power input terminal of the detection circuit.

4. A lithium-ion battery charging device according to claim 3, characterized in that: The detection circuit includes a detection element and a third resistor. The detection element is a DS18B20, and the third resistor has a resistance of 4.7KΩ. Pin 1 of the detection element is grounded, pin 2 of the detection element is the signal output terminal of the detection circuit, pin 3 of the detection element is electrically connected to pin 2 of the switching element, one end of the third resistor is connected to pin 2 of the detection element, and the other end of the third resistor is connected to a 3.3V power supply.

5. A lithium-ion battery charging device according to claim 3, characterized in that: The power supply circuit also includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a fifth Zener diode. The seventh capacitor has a capacitance of 10uF, the eighth, ninth, tenth, and eleventh capacitors each have a capacitance of 100nF, and the twelfth capacitor has a capacitance of 220uF. One end of the seventh, eighth, ninth, tenth, eleventh, and twelfth capacitors and the negative terminal of the fifth Zener diode are electrically connected to a filter wire. One end of the filter wire is electrically connected to pin 2 of the switching element, and the other end of the filter wire is electrically connected to the power input terminal of the control circuit. The other ends of the seventh, eighth, ninth, tenth, eleventh, and twelfth capacitors and the positive terminal of the fifth Zener diode are all grounded.

6. A lithium-ion battery charging device according to claim 5, characterized in that: The control circuit includes a control element, a fifth resistor, a sixth resistor, and a light-emitting diode (LED). The control element is an STM32F030. The resistance values ​​of the fifth and sixth resistors are both 1KΩ. Pin 1 of the control element is electrically connected to one end of the sixth resistor, and the other end of the sixth resistor is grounded. Pin 4 of the control element is electrically connected to a reset circuit. Pin 6 of the control element is the signal output terminal of the control circuit and is electrically connected to the signal input terminal of the switching circuit. Pin 13 of the control element is electrically connected to one end of the fifth resistor, and the other end of the fifth resistor is electrically connected to the positive terminal of the LED. The negative terminal of the LED is grounded. Pin 14 of the control element is the signal input terminal of the control circuit. Pin 15 of the control element is grounded. Pin 16 of the control element is electrically connected to the end of the filter wire furthest from the switching element. Pins 19 and 20 of the control element are connected to a debugging circuit.

7. A lithium-ion battery charging device according to claim 6, characterized in that: The reset circuit includes a reset element, a ninth resistor, a twentieth capacitor, and a twenty-first capacitor. The reset element is model APX809S-29SA-7. The ninth resistor has a resistance of 10KΩ. The capacitances of the twentieth and twenty-first capacitors are both 0.1uF. Pin 1 of the reset element is grounded. Pin 4 of the control element, one end of the ninth resistor, and one end of the twenty-first capacitor are all electrically connected to pin 2 of the reset element. The other end of the ninth resistor is electrically connected to the end of the filter wire furthest from the switching element. The other end of the twenty-first capacitor is grounded. One end of the capacitor and pin 3 of the reset element are electrically connected to the end of the filter wire away from the switching element, and the other end of the 21st capacitor is grounded; the debugging circuit includes a JTAG interface and a fourth resistor with a resistance of 5.1KΩ. Pin 1 of the JTAG interface is electrically connected to the end of the filter wire away from the switching element, pin 2 of the JTAG interface is grounded, pin 4 of the JTAG interface is electrically connected to pin 20 of the control element, pin 5 of the JTAG interface and one end of the fourth resistor are both electrically connected to pin 19 of the control element, and the other end of the fourth resistor is grounded.

8. A lithium-ion battery charging device according to claim 3, characterized in that: A start switch is connected in series at the end of the first fuse furthest from the first inductor. A fuse is connected in series at the end of the start switch furthest from the first fuse. The end of the fuse furthest from the start switch is electrically connected to the live wire output terminal of the AC interface.

9. A lithium-ion battery charging device according to claim 2, characterized in that: The switching circuit includes a first relay, a seventh resistor, a third diode, a forced switch, and a second relay. The first relay is model GAQY212GSX, and the second relay is model SRD-12VDC-SL-C. Pin 1 of the first relay is the signal input terminal of the switching circuit. Pin 2 of the first relay is electrically connected to one end of the seventh resistor. The other end of the seventh resistor and pin 4 of the first relay are both grounded. Pin 3 of the first relay and the positive terminal of the third diode are both electrically connected to pin 4 of the second relay. The negative terminal of the third diode and pin 1 of the second relay are both connected to a 12V power supply. Pin 5 of the second relay and one end of the forced switch are both electrically connected to the three-way switching power supply components. Pin 2 of the second relay and the other end of the forced switch are both electrically connected to the AC output terminal of the circuit power supply.

10. A lithium-ion battery charging device according to claim 1, characterized in that: The charging module includes a charging shell, a charging control board, several charging interfaces, a first power supply interface, a second power supply interface, and a third power supply interface. The charging interfaces are located on the top of the charging shell. An indicator light is connected in series between the charging interface and the output terminal of the charging control board. The indicator light is located on the charging shell. The charging control board is located inside the charging shell. The output terminals of the first, second, and third power supply interfaces are all electrically connected to the input terminal of the charging control board. The first power supply interface is located at the bottom of the charging shell and is used to engage with a DC busbar. The second and third power supply interfaces are located on the side wall of the charging shell. The second power supply interface is a DC5521 input interface, and the third power supply interface is a Type-C input interface. A protective layer is provided on the outer wall of the charging shell.

11. A lithium-ion battery charging device according to claim 10, characterized in that: The housing has a panel with several slots and slots through it. The slots are for inserting the charging module. The protective layer is used to abut against the inner wall of the slot. Several horizontal elastic blocks are fixedly installed on the side wall of the charging housing. A vertical elastic block is fixedly installed at the end of the horizontal elastic block away from the side wall of the charging module. The vertical elastic block is used to insert into the slot. A pressing block and an abutting block are fixedly installed on the side of the vertical elastic block away from the charging module. The pressing block is located above the abutting block. The outer wall of the abutting block is used to fit against the inner wall of the slot. A transparent shell is detachably installed on the top of the charging housing and covers the charging interface.

12. A lithium-ion battery charging device according to claim 11, characterized in that: The bottom of the charging case is detachably provided with an expansion base, and several snap-fit ​​plates are fixedly provided on the expansion base. Snap-fit ​​holes are opened through the snap-fit ​​plates for inserting vertical elastic blocks and abutment blocks. A silicone gasket is sleeved on the protective layer. The top of the silicone gasket is tightly fitted to the bottom of the charging case, and the bottom of the silicone gasket is used to tightly fit to the top of the expansion base.

13. A lithium-ion battery charging device according to claim 1, characterized in that: The housing includes an upper shell and a lower shell, which are detachably connected. The AC interface is disposed through the lower shell, and a handle is fixedly provided on the side wall of the lower shell.

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