Charging machine turn-off device and charging machine

Abstract

The invention belongs to the technical field of new energy automobile chargers, and particularly relates to a charger turn-off device and a charger, and the charger turn-off device comprises a charger control device, and a charging module and an environmental parameter detection module which are connected with the charger control device; the normal turn-off execution unit is electrically connected with the alternating current input contactor through a power supply cable, and the normal turn-off execution unit is electrically connected with the direct current output contactor through a power supply cable, so that the normal turn-off execution unit controls the on-off state of the alternating current input contactor and the on-off state of the direct current output contactor respectively; the sudden stop execution unit is used for controlling the on-off state of the circuit breaker. The emergency stop button and the normal turn-off switch are physically distinguished, the emergency stop button is pressed under the condition of emergency safety risks, the normal turn-off switch is rotated under the condition of normal turn-off, and safe charging of a vehicle battery and safe turn-off of a charger are achieved in cooperation with a motor control device.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle charger technology, specifically relating to a charger shut-off device and charger. Background Technology

[0002] With the increasing popularity of new energy electric vehicles, chargers are being used more and more widely. During daily use, chargers need to be equipped with appropriate emergency stop and normal shutdown devices to ensure safe operation and facilitate user convenience. However, existing chargers only have an emergency stop button.

[0003] Problems with existing technology:

[0004] 1. In traditional chargers, when the charger is shut down in an emergency or non-emergency situation, the charging user must press the emergency stop button to stop charging. In this case, when a user comes to charge, maintenance personnel need to eliminate the safety risks or faults on-site before charging can be resumed, which affects the time when the equipment can provide normal charging services to the public.

[0005] 2. Although some existing chargers have a shut-off function, they do not have a specific mechanical execution function. Furthermore, some chargers with mechanical shut-off functions do not have a function to prevent accidental opening, which makes it easy for the charging circuit to be opened when not charging, thus posing a safety hazard.

[0006] 3. Existing chargers operate in complex environments. In the event of sudden environmental events, such as abnormally high temperatures, excessive concentrations of harmful gases, smoke, or open flames, traditional chargers lack direct and rapid environmental perception and independent response capabilities. Summary of the Invention

[0007] The purpose of this invention is to provide a charging shutdown device and a charger. By physically distinguishing between an emergency stop button and a normal shutdown switch, the emergency stop button can be pressed in case of an emergency with safety risks, and the normal shutdown switch can be rotated in case of normal shutdown. In conjunction with the motor control device, the safe charging of the vehicle battery and the safe shutdown of the charger can be achieved.

[0008] The specific technical solution adopted by this invention is as follows: A charging shut-off device is used in a charger, including a charger control device, a charging module and an environmental parameter detection module connected to the charger control device; The normal shutdown execution unit is electrically connected to the AC input contactor via a power supply cable and to the DC output contactor via a power supply cable, so that the normal shutdown execution unit controls the on / off state of the AC input contactor and the DC output contactor respectively. The emergency stop execution unit is used to control the on / off state of the circuit breaker. The charging gun head is equipped with a pressure sensor and a communication module. The pressure sensor is electrically connected to the charger control device, and the communication module is used for communication between the charger control device and the vehicle battery management system to obtain real-time status parameters of the battery being charged. The charger control device also includes a local logic control unit connected to the environmental parameter detection module and the battery status monitoring module. It is used to generate a shutdown control signal independently of the main controller of the charger body based on the environmental parameters and / or the status parameters. The shutdown control signal and the normal shutdown execution unit are used to control the disconnection of the AC input contactor and / or the DC output contactor.

[0009] The normal shutdown execution unit also includes a fixed housing that is fixedly installed on the surface of the charger control device. The fixed housing is provided with a stationary contact and a micro stepper motor. The micro stepper motor drives the mounting base to rotate counterclockwise through the mounting sleeve, so that the mounting base drives the moving contact to rotate counterclockwise and disconnects the moving contact from the stationary contact.

[0010] The micro stepper motor drives the transmission rod to rotate clockwise, causing the moving contact and the stationary contact to close, and provides power to the electromagnetic coils of the AC input contactor and the DC output contactor respectively through the normal shutdown execution unit; The transmission rod is rotatably mounted inside the card plate via the mounting sleeve, causing the micro stepper motor to drive the mounting sleeve to rotate clockwise via the transmission rod, and the actuating component to push the mounting plate to swing the card plate, thereby separating the card plate from the ratchet.

[0011] The ratchet is fixedly installed with the gear set, so that the ratchet drives the rotary switch to rotate to the closed state through the gear set; The locking plate and ratchet are used to constrain the clockwise rotation of the rotary switch in the off state. The rotary switch drives the mounting base to rotate counterclockwise to the off state through the ratchet, so that the mounting base drives the moving contact to disconnect from the stationary contact.

[0012] The ratchet is fixedly installed on the mounting base. The mounting plate consists of two meshing gears, one of which is fixedly installed on the ratchet and the other gear is fixedly installed on the rotary switch.

[0013] The card plate has a fixing rod inside, and a torsion spring is provided between the card plate and the fixing rod, so that the card plate swings back to its original position through the toggle and the mounting plate, and the fixing rod is fixedly installed to the charger body.

[0014] An environmental parameter detection module is fixedly installed on the top of the charger body. The environmental parameter detection module is used to collect environmental parameters of the charger environment. The environmental parameter detection module includes a mounting bracket fixedly installed on the top of the charger body. A solar panel and an integrated detection box are fixedly installed on both sides of the mounting bracket, and the integrated detection box includes at least one of a temperature sensor, a smoke sensor, and a combustible gas solubility sensor.

[0015] The pressure sensor is used to detect the physical connection status between the charging gun head and the vehicle charging port and generate a connection status signal. The local logic control unit is electrically connected to the pressure sensor and is used to receive the connection status signal and drive the normal shutdown execution unit based on the connection status signal.

[0016] Along the direction from the AC input terminal to the DC output terminal of the charger body, the circuit breaker, AC input contactor, power conversion module, DC output contactor and charging module are connected in series in sequence; A charger control device is fixedly installed on the surface of the charger body. The surface of the charger control device is provided with a normal shutdown execution unit and an emergency stop execution unit. The charger control device is electrically connected to an environmental parameter detection module. The normal shutdown execution unit is electrically connected to an AC input contactor and a DC output contactor, respectively. The emergency stop execution unit is electrically connected to a circuit breaker.

[0017] A method for safely shutting down a charger includes the following steps: The environmental parameter detection module and the charging module acquire different environmental parameters of the charger body, differences in the state parameters of the battery being charged, and differences in the connection status signal of the charging module. Based on these differences, corresponding safety thresholds are generated, and preset values ​​of various safety thresholds are stored through the local logic control unit. Real-time acquisition of environmental parameters of the current environment where the charger body is located, status parameters of the battery being charged, and connection status signals of the charging module; The acquired environmental parameters, the state parameters of the battery being charged, and the connection status signal of the charging module are compared with the safety threshold set by the local logic control unit to obtain a comparison result. Based on the comparison results, if any parameter in the comparison results exceeds its corresponding safety threshold range, the local logic control unit immediately generates a shutdown control signal. The shutdown control signal generated by the local logic control unit is acquired and sent to the normal shutdown execution unit. The normal shutdown execution unit controls the disconnection action of the AC input contactor and / or DC output contactor according to the signal content to cut off the charging circuit of the charger body. Based on the comparison results, if all parameters are within the safety threshold range, the charger body maintains normal charging status, and the local logic control unit continuously monitors the changes of each parameter.

[0018] The technical effects achieved by this invention are as follows: 1. This invention effectively solves the service interruption problem caused by the mixing of emergency stop and normal shutdown operations in traditional chargers by setting up independent emergency stop execution units and normal shutdown execution units. In the event of an emergency safety risk, the user can quickly press the emergency stop execution unit to cut off the circuit breaker. This emergency stop execution unit is independent of the normal charging control process and can immediately cut off the charging circuit to ensure the safety of personnel and equipment. When charging needs to be stopped in non-emergency situations, the user can rotate the normal shutdown switch to achieve safe charging management of the vehicle battery and avoid unnecessary service interruptions caused by accidental operation of the emergency stop button. As a result, the equipment can be quickly restored without the need for on-site troubleshooting by maintenance personnel.

[0019] 2. The shut-off execution unit of the present invention adopts a dual gear transmission combined with an electric control drive design to realize physical disconnection and electric disconnection and closing, and simultaneously realize the function of preventing accidental opening. When the charging circuit is in the disconnected state, the swing component driven by the torsion spring will lock the operating mechanism through the gear set to ensure that unauthorized personnel cannot manually close the contactor, which greatly reduces the risk of electric shock in the non-charging state.

[0020] 3. This invention integrates a multi-type sensor array into an environmental sensing system, enabling real-time monitoring of parameters such as temperature, smoke, and combustible gas concentration. When any indicator exceeds a safety threshold, the local logic control unit can control the normal shutdown execution unit to independently cut off the charging circuit. Simultaneously, the battery status monitoring module acquires real-time BMS data through a bidirectional communication module. Combined with environmental parameters and charging module connection status signals, a triple safety protection system is constructed, significantly improving the safety of the charging process. Specifically, this environmental sensing system not only possesses high-sensitivity detection capabilities but also responds rapidly in extreme environments, ensuring that the charger automatically cuts off power when facing potential dangers, preventing the accident from escalating. Furthermore, the mechanical operation of the normal shutdown execution unit ensures the charger's safe shutdown even in the event of a main controller malfunction or network communication interruption. Attached Figure Description

[0021] Figure 1 This is a flowchart of the charging process of the charger body of the present invention; Figure 2 This is a flowchart of the normal shutdown execution process of the charger in this invention; Figure 3 This is a flowchart of the local logic control unit in this invention; Figure 4 This is a flowchart of the charging module's operation in this invention; Figure 5 This is a perspective view of the charger body structure in this invention; Figure 6 This is a schematic diagram of the connection structure of the normal shutdown execution unit in this invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the fixed outer shell in this invention; Figure 8 This is a schematic diagram of the dual-control shutdown component structure in this invention; Figure 9 This is a schematic diagram of the rotary switch in the off state in this invention; Figure 10 This is a schematic diagram of the ratchet mounting structure in this invention; Figure 11 This is a schematic diagram of the closed state structure of the rotary switch in this invention; Figure 12 This is a schematic diagram of the charging module structure in this invention; Figure 13 This is a schematic diagram of the environmental parameter detection module in this invention.

[0022] The following is a list of components represented by each label in the attached diagram: 1. Charger body; 2. Charger control device; 3. Normal shutdown execution unit; 31. Fixed housing; 32. Power supply cable; 33. Dual-control shutdown component; 331. Mounting base; 332. Moving contact; 333. Miniature stepper motor; 334. Gear set; 335. Fixing rod; 336. Actuating element; 337. Control component; 338. Mounting plate; 34. Stationary contact; 35. Drive rod; 36. Mounting sleeve; 37. Ratchet; 38. Clamping plate; 39. Rotary switch; 4. Emergency stop execution unit; 5. Charging module; 51. Charging gun head; 52. Pressure sensor; 53. Communication module; 6. Environmental parameter detection module; 61. Mounting bracket; 62. Solar panel; 63. Integrated detection box; 7. Circuit breaker; 8. AC input contactor; 9. DC output contactor. Detailed Implementation

[0023] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0024] like Figure 1-13As shown, a charging shutdown device and a charger include a charger control device 2, a charging module 5 and an environmental parameter detection module 6 connected to the charger control device 2, wherein the charger control device 2 is communicatively connected to the charging module 5, and electrically connected to the environmental parameter detection module 6. The charger control device 2 is also electrically connected to a normal shutdown execution unit 3.

[0025] According to the above structure, the charger control device 2, as the core control device of the charger body 1, integrates a local logic control unit, which has powerful data processing and decision-making capabilities.

[0026] Specifically, the environmental parameter detection module 6 includes a mounting bracket 61 fixedly installed on the top of the charger body 1. A solar panel 62 and an integrated detection box 63 are fixedly installed on both sides of the mounting bracket 61, and the integrated detection box 63 includes at least one of a temperature sensor, a smoke sensor and a combustible gas solubility sensor.

[0027] The solar panel 62 is used to convert solar energy into electrical energy, providing auxiliary power support for some components or the entire environmental parameter detection module 6, reducing dependence on external power sources. At the same time, the design of the solar panel also takes into account the stable connection with the mounting bracket 61 and the coordination with the overall appearance of the charger, ensuring efficient use of energy without affecting the normal function of the charger.

[0028] More specifically, the temperature sensor in the integrated detection box 63 can monitor the temperature changes of the environment where the charger body 1 is located in real time. When the temperature exceeds the preset safety range, it will transmit the signal to the local logic control unit in a timely manner. At the same time, the smoke sensor in the integrated detection box 63 detects the smoke concentration in the surrounding environment, and the combustible gas concentration sensor in the integrated detection box 63 is used to monitor the concentration of combustible gas in the environment.

[0029] See attached document Figures 1 to 6 as well as Figure 12 It is worth noting that a pressure sensor 52 and a communication module 53 are installed inside the charging gun head 51 of the charging module 5. The pressure sensor 52 and the communication module 53 are used to detect the physical connection status between the charging gun head 51 and the vehicle charging port and to realize the communication connection with the vehicle battery management system, respectively.

[0030] Specifically, the pressure sensor 52, as a pressure sensor, can accurately sense the connection pressure between the charging gun head and the vehicle charging port, thereby determining whether the two are securely connected. Once an abnormal connection status is detected, such as a loose connection or no connection, the pressure sensor 52 will immediately generate a corresponding connection status signal and transmit it to the local logic control unit. After receiving this signal, the local logic control unit will quickly analyze and process it, and decide whether to take corresponding safety measures, such as stopping charging or issuing an alarm, based on the preset safety threshold.

[0031] Furthermore, the communication module 53 is responsible for real-time data exchange with the vehicle battery management system and the charger main controller. It can obtain real-time status parameters of the battery being charged, such as battery voltage, current, and temperature, and transmit these data to the local logic control unit.

[0032] Furthermore, the local logic control unit operates by receiving data from the vehicle battery management system and the pressure value from the pressure sensor 52. It then combines this data with environmental parameters transmitted from the environmental parameter detection module 6, such as temperature, smoke concentration, and combustible gas concentration, and compares them with the set safety thresholds. If any parameter exceeds the preset safety threshold range, the local logic control unit immediately generates a shutdown control signal and controls the AC input contactor 8 and / or DC output contactor 9 to disconnect through the normal shutdown execution unit 3.

[0033] It should be noted that an emergency stop execution unit 4 is also installed on the surface of the charger control device 2, and the emergency stop execution unit 4 is electrically connected to the circuit breaker 7. Therefore, in the event of an emergency safety risk, the user can directly press the emergency stop execution unit 4, which will quickly cut off the circuit of the circuit breaker 7. Since the emergency stop execution unit 4 is independent of the normal charging control process, it can immediately cut off the charging circuit to ensure the safety of personnel and equipment.

[0034] See attached document Figures 5 to 11 The normal shutdown execution unit 3 also includes a fixed housing 31 fixedly installed on the surface of the charger control device 2. The dual-control shutdown component 33 set inside the fixed housing 31 is electrically connected to the AC input contactor 8 and the DC output contactor 9 respectively through the power supply cable 32. The fixed housing 31 is equipped with a stationary contact 34 and a micro stepper motor 333. The micro stepper motor 333 drives the mounting base 331 to rotate counterclockwise through the mounting sleeve 36, so that the mounting base 331 drives the moving contact 332 to rotate counterclockwise, and makes the moving contact 332 disconnect from the stationary contact 34. At this time, the charging circuit is cut off, realizing rapid shutdown in non-emergency situations.

[0035] Simultaneously, the charger control device 2 can drive the control component 337 to start the micro stepper motor 333, causing the micro stepper motor 333 to drive the mounting base 331 to rotate clockwise via the transmission rod 35, thereby closing the moving contact 332 and the stationary contact 34, restoring the power supply to the electromagnetic coils of the AC input contactor 8 and / or the DC output contactor 9 in the charging circuit.

[0036] According to the above structure, a toggle member 336 is also fixedly installed at one end of the transmission rod 35. The clockwise rotation of the transmission rod 35 can drive the toggle member 336 to rotate synchronously. The toggle member 336 can push the mounting plate 338 to swing the locking plate 38, causing the locking plate 38 to separate from the ratchet 37 intermittently. This allows the mounting base 331 to drive the gear set 334 to rotate synchronously clockwise through the ratchet 37, thereby causing the gear set 334 to drive the rotary switch 39 to rotate clockwise to the closed state.

[0037] Of course, when the transmission rod 35 rotates counterclockwise to disconnect the moving contact 332 from the stationary contact 34, the rotary switch 39 can be synchronously rotated to the disconnected state because the locking plate 38 and the ratchet 37 are in a non-locking state.

[0038] It should be noted that the locking plate 38 and the ratchet 37 are used to constrain the clockwise rotation of the rotary switch 39 when the moving contact 332 and the stationary contact 34 are in the open state. This ensures that the rotary switch 39 can only be in the closed state when the moving contact 332 and the stationary contact 34 are closed. The ratchet 37 drives the mounting base 331 to rotate counterclockwise to the open state, and the mounting base 331 drives the moving contact 332 and the stationary contact 34 to open. This realizes the manual disconnection of the power supply to the electromagnetic coil of the AC input contactor 8 and / or the DC output contactor 9 by the normal shutdown execution unit 3.

[0039] In summary, when the charging circuit is in the open state, the torsion spring driven plate 38 will lock the operation of the rotary switch 39 through the ratchet 37, ensuring that unauthorized personnel cannot manually close the contactor, which greatly reduces the risk of electric shock in the non-charging state and realizes the function of preventing accidental opening. At the same time, it will not affect the manual shutdown of the charger body 1 in the normal charging state.

[0040] Please refer to the appendix again. Figures 8 to 10 The ratchet 37 is fixedly installed on the mounting base 331. The mounting plate 338 consists of two meshing gears, one of which is fixedly installed on the ratchet 37 and the other is fixedly installed on the rotary switch 39. The mounting plate 338 realizes the power transmission and motion conversion between the ratchet 37 and the rotary switch 39. Moreover, this dual-gear linkage design not only enhances the stability of the mechanical structure, but also improves the accuracy of operation, ensuring that every closing or shut-off action can be executed accurately.

[0041] The card plate 38 has a fixing rod 335 inside, and a torsion spring is provided between the card plate 38 and the fixing rod 335. The card plate 38 swings back to its original position through the toggle member 336 and the mounting plate 338. The fixing rod 335 is fixedly installed to the charger body 1. The torsion spring between the card plate 38 and the fixing rod 335 has a carefully designed spring coefficient so that its swing amplitude is greater than the tooth depth of the ratchet 37. This ensures that when the charging circuit is disconnected, the card plate 38 can quickly and stably lock the rotary switch 39 through the ratchet 37 to prevent unauthorized personnel from manually closing the contactor. It also provides appropriate resistance when manual operation is required to ensure the safety and accuracy of operation.

[0042] Meanwhile, the installation method of the fixing rod 335 and the charger body 1 can also be optimized. High-strength connectors and anti-loosening design can be adopted to ensure that the fixing rod 335 will not loosen due to vibration or external force during long-term use, thereby affecting the normal operation of the entire normal shutdown execution unit 3.

[0043] As can be further explained, the fixed housing 31 serves as the mounting medium for the normal shutdown execution unit 3 and the charger control device 2. It is made of aluminum alloy material with high strength, corrosion resistance and good heat dissipation performance. It can not only effectively protect the internal components from the corrosion of the external environment, but also quickly dissipate the heat generated inside when the charger is working for a long time. At the same time, the surface of the fixed housing 31 has also undergone special anti-rust treatment, which further improves its service life and reliability.

[0044] See attached document Figures 1 to 6 A circuit breaker 7, an AC input contactor 8, a power conversion module, a DC output contactor 9, and a charging module 5 are connected in series from the AC input terminal to the DC output terminal of the charger body 1. Among them, the circuit breaker 7 serves as the first safety barrier of the charger. Its rated current and breaking capacity are carefully designed to quickly cut off the circuit in case of overload or short circuit, prevent the fault from spreading, and protect the safety of subsequent equipment.

[0045] According to the above structure, the AC input contactor 8 is responsible for controlling the connection and disconnection of AC power when the charger starts or stops. Its action is rapid and reliable, which can effectively reduce the generation of electric arc and extend the service life of the equipment.

[0046] Furthermore, the power conversion module is one of the core components of the charger. It is responsible for converting the input AC power into DC power suitable for battery charging, and through advanced control algorithms, it realizes intelligent management of the charging process, such as constant current charging and constant voltage charging, to ensure that the battery is charged in the best condition, thereby improving charging efficiency and battery life.

[0047] Furthermore, the DC output contactor 9, located after the power conversion module, is responsible for outputting the converted DC power to the charging module 5, providing a stable charging power supply for electric vehicles. Its design also considers high-voltage, high-current operating environments, employing high-quality conductive materials and heat dissipation structures to ensure good electrical performance and heat dissipation even under prolonged, high-load operating conditions.

[0048] It is worth noting that an environmental parameter detection module 6 is fixedly installed on the top of the charger body 1. The environmental parameter detection module 6 is used to collect environmental parameters of the charger environment. The pressure sensor 52 installed inside the charging gun head 51 is used to detect the physical connection status between the charging gun head 51 and the vehicle charging port and generate a connection status signal. The communication module 53 installed inside the charging gun head 51 is used to obtain the status parameters of the battery being charged.

[0049] like Figures 1 to 13 As shown, the integrated detection box 63 of the environmental parameter detection module 6 integrates a temperature sensor, a smoke sensor and a combustible gas concentration sensor, and is installed on the outside of the charger body 1 through the integrated detection box 63 and the mounting bracket 61.

[0050] Furthermore, the battery status monitoring module obtains the battery status parameters from the vehicle battery management system directly from the communication module 53 inside the charging gun head 51 via an external signal line (such as a hard wire).

[0051] Furthermore, the local logic control internally stores environmental safety thresholds, battery safety thresholds, and safety thresholds for the connection status of the charging module 5.

[0052] Among them, the environmental safety thresholds include an ambient temperature threshold (55℃) and a shutdown threshold (70℃-85℃). The shutdown threshold for smoke concentration can be set to 70%-80% of the sensor's calibrated sensitivity. For example, if the sensor alarms at 1.5%-2.0% / foot (light reduction rate), the shutdown threshold can be set in the range of 1.2%-1.5% / foot. This can shut down the fire in the early stage of a smoldering fire to prevent arc ignition. The combustible gas (taking hydrogen as an example) concentration threshold includes an early warning threshold and a shutdown threshold. The hydrogen explosion limit (volume concentration) is 4.0%-75.0%. Safety standards require the early warning value to be far below the lower explosion limit, i.e., the early warning value should be 10% LEL (i.e., 0.4% volume concentration), and the shutdown threshold is 25% LEL (i.e., 1.0% volume concentration).

[0053] In addition, the maximum allowable temperature for battery charging is usually 45℃-55℃, so the shutdown threshold needs to be set at 60℃. The battery voltage threshold needs to be dynamically calculated based on the nominal total voltage of the battery pack. For example, for a battery pack with a rated voltage of 400V, the total voltage shutdown threshold can be set to 410V.

[0054] Finally, the contact pressure required by the charging module 5 is usually above tens of Newtons. Combined with the mechanical gain of the locking mechanism built into the charging gun head 51, the force acting on the locking point must reach this range to confirm a reliable connection. Therefore, the safety threshold of the charging module 5 should be (50N-150N), while the preferred value for starting the charger body 1 is 80N.

[0055] Based on the above, the safe shutdown method for chargers includes the following steps: Once the local logic control unit receives data from the environmental parameter detection module, pressure sensor, and vehicle battery management system, it will immediately initiate a safety assessment process.

[0056] First, the environmental parameters are compared one by one. If the ambient temperature detected by the temperature sensor reaches or exceeds the warning threshold (55℃), the local logic control unit will trigger the warning mechanism and issue a high temperature warning to the user through the display screen or indicator light on the charger. If the ambient temperature continues to rise to the shutdown threshold (70℃-85℃), the local logic control unit will generate a shutdown control signal and quickly cut off the power supply of the AC input contactor 8 and / or DC output contactor 9 through the normal shutdown execution unit 3, ensuring that the charger body 1 stops working immediately and preventing safety accidents caused by high temperature.

[0057] Meanwhile, the local logic control unit will also strictly compare the detection data of the smoke sensor and the combustible gas concentration sensor. Once the smoke concentration reaches or exceeds the set shutdown threshold (such as 70%-80% of the sensor calibration sensitivity), or the combustible gas (taking hydrogen as an example) concentration reaches the warning threshold (0.4% volume concentration) or even the shutdown threshold (1.0% volume concentration), the local logic control unit will generate a shutdown control signal. The power supply of the AC input contactor 8 and / or DC output contactor 9 will be quickly cut off by the normal shutdown execution unit 3 to ensure that the charger body 1 stops working immediately and ensure the safety of the charging environment.

[0058] The principle of AC input contactor 8 and DC output contactor 9 is as follows: when AC voltage is applied to both ends of the contactor coil, alternating current flows through the coil, generating an alternating magnetic field. The magnetic field attracts the armature, causing the main contacts to close and connecting the main circuit. When the coil power supply is cut off, the spring will reset and the contacts will open, thus disconnecting AC input contactor 8 and DC output contactor 9.

[0059] Regarding battery status monitoring, the local logic control unit will acquire key parameters such as voltage and temperature of the battery being charged in real time and compare them with preset battery safety thresholds. If the battery temperature exceeds the shutdown threshold (e.g., 60℃) or the battery voltage exceeds the dynamically calculated shutdown threshold (e.g., for a battery pack with a rated voltage of 400V, the total voltage shutdown threshold is set to 410V), the local logic control unit will also generate a shutdown control signal to cut off the charging circuit through the normal shutdown execution unit 3, protecting the battery from damage.

[0060] In addition, the connection status between the charging gun head 51 and the vehicle charging port detected by the pressure sensor 52 is also a key focus of the local logic control unit. If the connection pressure is detected to be below the preset safety threshold range (50N-150N), it indicates that there may be a loose or disconnected connection between the charging module 5 and the vehicle charging port. The local logic control unit will immediately generate a connection abnormality signal and issue a connection abnormality warning to the user through the display screen or indicator light on the charger body 1. At the same time, it will decide whether to stop the charging process immediately according to the preset safety policy.

[0061] The working principle of this invention is as follows: After the charger is started, all components work together. The environmental parameter detection module 6 collects data such as temperature, smoke concentration, and combustible gas concentration in the charger environment and transmits them to the local logic control unit. This unit compares the data with the environmental safety threshold. If the environmental parameters are normal, the charger charges normally. At the same time, the pressure sensor 52 detects the connection status between the charging gun head 51 and the vehicle charging port, and the communication module 53 obtains the status parameters of the battery being charged. All of these are transmitted to the local logic control unit. If the battery parameters are normal, charging proceeds stably. During charging, the power conversion module converts AC power to DC power. The charging process is intelligently managed by the charger's built-in control algorithm, and the DC output contactor 9 outputs DC power to the charging module 5. If an abnormality occurs during charging, such as the ambient temperature reaching the warning threshold (55℃), the local logic control unit triggers a warning; when the shutdown threshold (70℃-85℃) is reached, the power supply to the AC input contactor 8 and / or the DC output contactor 9 is cut off. When the smoke concentration or combustible gas concentration reaches the shutdown threshold, the power supply is also cut off. When the battery temperature or voltage exceeds the shutdown threshold, the charging circuit is also cut off. The pressure sensor 52 detects an abnormal connection pressure and issues a connection abnormality warning. In severe cases, charging is stopped. In case of emergency safety risks, the user can rotate the emergency stop execution unit 4 to cut off the circuit of the circuit breaker 7. In non-emergency situations, the user can operate the components on the normal shutdown execution unit 3 to shut off or restore the charging circuit. The entire charger achieves safe, efficient and intelligent charging through the precise control of the components and the local logic control unit.

[0062] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A charging shut-off device, used in a charger, characterized in that, include: The charger control device (2), and the charging module (5) and the environmental parameter detection module (6) connected to the charger control device (2); Normal shutdown execution unit (3) is electrically connected to AC input contactor (8) via power supply cable (32) and DC output contactor (9) via power supply cable (32), so that normal shutdown execution unit (3) controls the on / off state of AC input contactor (8) and DC output contactor (9) respectively. Emergency stop execution unit (4) is used to control the on / off state of circuit breaker (7). The charging gun head (51) is equipped with a pressure sensor (52) and a communication module (53). The pressure sensor (52) is electrically connected to the charger control device (2). The communication module (53) is used for communication connection between the charger control device (2) and the vehicle battery management system to obtain the real-time status parameters of the battery being charged. The charger control device (2) also includes a local logic control unit connected to the environmental parameter detection module (6) and the battery status monitoring module. It is used to generate a shutdown control signal independently of the main controller of the charger body (1) based on the environmental parameters and / or the status parameters. The shutdown control signal and the normal shutdown execution unit (3) are used to control the disconnection of the AC input contactor (8) and / or the DC output contactor (9).

2. The charging shut-off device according to claim 1, characterized in that: The normal shutdown execution unit (3) further includes a fixed housing (31) fixedly installed on the surface of the charger control device (2). The fixed housing (31) is provided with a stationary contact (34) and a micro stepper motor (333). The micro stepper motor (333) drives the mounting base (331) to rotate counterclockwise through the mounting sleeve (36), so that the mounting base (331) drives the moving contact (332) to rotate counterclockwise, and the moving contact (332) is disconnected from the stationary contact (34).

3. The charging shut-off device according to claim 1, characterized in that: The micro stepper motor (333) drives the transmission rod (35) to rotate clockwise, so that the moving contact (332) and the stationary contact (34) are closed, and the normal shutdown execution unit (3) provides power to the electromagnetic coils of the AC input contactor (8) and the DC output contactor (9) respectively. The transmission rod (35) is rotatably mounted inside the card plate (38) via the mounting sleeve (36), so that the micro stepper motor (333) drives the mounting sleeve (36) to rotate clockwise via the transmission rod (35), and pushes the mounting plate (338) via the actuating element (336) to make the card plate (38) swing, so that the card plate (38) separates from the ratchet (37).

4. A charging shut-off device according to claim 3, characterized in that: The ratchet (37) is fixedly installed with the gear set (334), so that the ratchet (37) drives the rotary switch (39) to rotate to the closed state through the gear set (334); The plate (38) and ratchet (37) are used to constrain the clockwise rotation of the rotary switch (39) in the off state. The rotary switch (39) drives the mounting base (331) to rotate counterclockwise to the off state through the ratchet (37), so that the mounting base (331) drives the moving contact (332) to disconnect from the stationary contact (34).

5. A charging shut-off device according to claim 3, characterized in that: The ratchet (37) is fixedly installed on the mounting base (331), and the mounting plate (338) consists of two meshing gears, one of which is fixedly installed on the ratchet (37) and the other gear is fixedly installed on the rotary switch (39).

6. A charging shut-off device according to claim 4, characterized in that: The card plate (38) is provided with a fixing rod (335) inside. A torsion spring is provided between the card plate (38) and the fixing rod (335) so that the card plate (38) can swing back to its original position through the toggle member (336) and the mounting plate (338). The fixing rod (335) is fixedly installed with the charger body (1).

7. The charger according to claim 1, characterized in that: An environmental parameter detection module (6) is fixedly installed on the top of the charger body (1). The environmental parameter detection module (6) is used to collect environmental parameters of the charger environment. The environmental parameter detection module (6) includes a mounting bracket (61) fixedly installed on the top of the charger body (1). A solar panel (62) and an integrated detection box (63) are fixedly installed on both sides of the mounting bracket (61). The integrated detection box (63) includes at least one of a temperature sensor, a smoke sensor and a combustible gas solubility sensor.

8. The charger according to claim 1, characterized in that: The pressure sensor (52) is used to detect the physical connection status between the charging gun head (51) and the vehicle charging port and generate a connection status signal. The local logic control unit is electrically connected to the pressure sensor (52) and is used to receive the connection status signal and drive the normal shutdown execution unit (3) based on the connection status signal.

9. The charger according to claim 1, characterized in that: Along the AC input terminal to DC output terminal of the charger body (1), the circuit breaker (7), AC input contactor (8), power conversion module, DC output contactor (9) and charging module (5) are connected in series. The charger body (1) is fixedly mounted with a charger control device (2). The charger control device (2) is provided with a normal shutdown execution unit (3) and an emergency stop execution unit (4). The charger control device (2) is electrically connected to the environmental parameter detection module (6). The normal shutdown execution unit (3) is electrically connected to the AC input contactor (8) and the DC output contactor (9) respectively. The emergency stop execution unit (4) is electrically connected to the circuit breaker (7).

10. A method for safely shutting off a charger, applied to the charger shutdown device and charger as described in any one of claims 1-9, characterized in that, Includes the following steps: According to the environmental parameter detection module (6) and the charging module (5), the different environmental parameters of the charger body (1), the differences in the state parameters of the charged battery, and the differences in the connection status signal of the charging module (5) are obtained. Based on the differences, corresponding safety thresholds are generated, and the preset values ​​of various safety thresholds are stored through the local logic control unit. Real-time acquisition of environmental parameters of the environment in which the charger body (1) is located, state parameters of the battery being charged, and connection status signal of the charging module (5); The obtained environmental parameters, the state parameters of the battery being charged, and the connection status signal of the charging module (5) are compared with the safety threshold set by the local logic control unit to obtain the comparison result. Based on the comparison results, if any parameter in the comparison results exceeds its corresponding safety threshold range, the local logic control unit immediately generates a shutdown control signal. The shutdown control signal generated by the local logic control unit is obtained and sent to the normal shutdown execution unit (3). The normal shutdown execution unit (3) controls the disconnection action of the AC input contactor (8) and / or the DC output contactor (9) according to the signal content to cut off the charging circuit of the charger body (1). Based on the comparison results, if all parameters are within the safety threshold range, the charger body (1) maintains normal charging status, and the local logic control unit continuously monitors the changes of each parameter.

Images