Charger and charging system

Abstract

The embodiment of the invention provides a charger and a charging system, the charger comprises a power supply plug, a temperature switch and a function box, the power supply plug and the function box are connected through a charging line, a part of the charging line is located in the function box, the function box comprises a power supply module and a relay, and the relay is connected to the charging line. The input end of the power module is connected with the charging wire, and the output end of the power module is connected with a coil of the relay through the temperature switch to control the relay to be switched off or switched on. The embodiment of the invention can reduce the safety risk of the charger.

Description

Technical Field

[0001] The present application relates to the field of electronic circuit technology, and in particular to a charger and a charging system. Background Art

[0002] At present, the charging methods of electric vehicles mainly include DC charging and AC charging. During AC charging, the function box draws power from the mains socket through the power plug. After the function box is powered on, the control module in the function box controls whether the relay is turned on through software, thereby controlling whether to charge the vehicle. In order to ensure the safety of charging, a temperature detection unit is generally set in the power plug to detect the temperature of the power plug. When the temperature of the power plug exceeds the set threshold, the control module stops charging through software control. However, if there is an abnormality in the software or control module, it is impossible to stop charging in time, which poses a safety risk. Summary of the invention

[0003] The embodiments of the present application provide a charger and a charging system, which can reduce the safety risks of the charger.

[0004] A first aspect of an embodiment of the present application provides a charger, comprising a power supply plug, a temperature switch and a function box, wherein the power supply plug and the function box are connected via a charging cable, a portion of the charging cable is located within the function box, the function box comprises a power supply module and a relay, the relay is connected to the charging cable, an input end of the power supply module is connected to the charging cable, and an output end of the power supply module is connected to a coil of the relay via the temperature switch to control the opening or closing of the relay.

[0005] Optionally, the temperature switch is arranged in the power supply plug.

[0006] Optionally, the function box further includes a first switch, and the output end of the power module is connected to the first end of the temperature switch through the first switch, and the second end of the temperature switch is connected to the coil of the relay.

[0007] Optionally, the function box further includes a first voltage detection module; the first voltage detection module is used to detect the voltage on the charging line.

[0008] Optionally, the function box further includes a second voltage detection module, and the second voltage detection module is used to detect the voltage of the second end of the temperature switch.

[0009] Optionally, the function box further includes a control module, and the power module is further used to supply power to the control module;

[0010] The control module is used to determine that the power plug is inserted into the mains socket according to the voltage detected by the first voltage detection module;

[0011] The control module is also used to control the first switch to be closed when the power plug is inserted into the mains socket and charging is ready, and to determine that the temperature switch is opened according to the voltage detected by the second voltage detection module.

[0012] Optionally, the control module is also used to determine a protection strategy based on the cumulative number of times the temperature switch is disconnected after the power plug is inserted into the AC power socket when the temperature switch is disconnected; or the control module is used to determine the protection strategy based on the continuous charging time of the charger; or the control module is used to determine the protection strategy based on the cumulative number of times the temperature switch is disconnected after the power plug is inserted into the AC power socket and the continuous charging time of the charger.

[0013] Optionally, the control module is used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including:

[0014] When the cumulative disconnection times of the temperature switch is less than a first threshold, the control module determines a target current reduction strategy according to the cumulative disconnection times of the temperature switch; wherein the current reduction degree of the target current reduction strategy is positively correlated with the cumulative disconnection times of the temperature switch;

[0015] When the accumulated disconnection times of the temperature switch is greater than or equal to the first threshold, the control module determines to stop the charging strategy.

[0016] Optionally, the functional box also includes: a control and guidance CP module; the control module is also used to determine the target duty cycle corresponding to the target current reduction strategy according to the cumulative number of disconnections of the temperature switch, and send a target CP signal to the vehicle's on-board charger through the control and guidance CP module, and the duty cycle of the target CP signal is the target duty cycle.

[0017] Optionally, the control module is used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including:

[0018] When the accumulated disconnection times of the temperature switch is greater than or equal to 1, the control module sends a charging stop message to the vehicle.

[0019] Optionally, when the control module sends a stop charging message to the vehicle, the vehicle sends a notification message to the user terminal, where the notification message is used to notify the user terminal that a charging failure occurs in the charger.

[0020] The control module is used to determine a protection strategy according to the continuous charging time of the charger, including:

[0021] When the continuous charging time of the charger is greater than a second threshold, determining that the continuous charging time of the charger falls within a target time interval, and determining a target charging current corresponding to the target time interval; wherein the target charging current is positively correlated with the target time interval;

[0022] When the continuous charging time of the charger is less than or equal to the second threshold, the control module determines a charging stop strategy.

[0023] Optionally, the function box further includes a prompt module. When the temperature switch is disconnected, the function box is used to send a prompt message through the prompt module, and the prompt message is used to prompt that an over-temperature fault occurs in the power plug.

[0024] Optionally, when the power supply plug is inserted into the mains socket, the cumulative number of disconnections stored in the control module is 0;

[0025] After the power supply plug is inserted into the mains socket, each time the temperature switch is detected to be disconnected, the control module adds 1 to the accumulated disconnection times;

[0026] When the power supply plug is disconnected from the mains socket, the accumulated disconnection times stored in the control module are reset to zero.

[0027] Optionally, the CP module includes a CP detection and control circuit, a second switch, a first resistor and a third switch; the first output end of the CP detection and control circuit is connected to the first end of the second switch, the second output end of the CP detection and control circuit is connected to the second end of the second switch, the third end of the second switch is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the third switch, and the second end of the third switch is connected to the CP port of the vehicle plug.

[0028] Optionally, the function box further includes a leakage detection circuit; the control module is further configured to control the first switch to be disconnected when the leakage detection circuit detects that the charger is leaking.

[0029] Optionally, the functional box further includes a current sampling circuit; the control module is further configured to control the first switch to be disconnected when the current on the charging line is detected by the current sampling circuit to be greater than a third threshold.

[0030] Optionally, the charger further comprises a vehicle plug, and when the vehicle plug is inserted into a vehicle socket, the charger establishes a charging circuit with the vehicle.

[0031] A second aspect of the embodiments of the present application provides a charging system, comprising the charger and a vehicle as described in any one of the first aspects of the embodiments of the present application.

[0032] The charger of the embodiment of the present application includes a power supply plug, a temperature switch and a function box. The power supply plug and the function box are connected by a charging line, a part of the charging line is located in the function box, and the function box includes a power module and a relay. The relay is connected to the charging line, the input end of the power module is connected to the charging line, and the output end of the power module is connected to the coil of the relay through the temperature switch to control the opening or closing of the relay. In the embodiment of the present application, the temperature switch is connected between the power module and the coil of the relay, and the power module supplies power to the coil of the relay through the temperature switch. When the temperature switch is disconnected due to overtemperature, the power module cannot supply power to the coil of the relay, causing the relay to disconnect, thereby automatically disconnecting the charging line, so that the charger stops charging. Compared with software control, the safety risk of the charger can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 is a schematic diagram of the structure of a charger provided in an embodiment of the present application;

[0035] Figure 2 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0036] Figure 3 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0037] Figure 4 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0038] Figure 5 is a schematic diagram of the structure of another charger provided in an embodiment of the present application;

[0039] Figure 6 It is a flow chart of a method for detecting disconnection of a temperature switch provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0041] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, products or devices.

[0042] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0043] See also Figure 1 , Figure 1 Schematic diagram of a charger provided in an embodiment of the present application. Figure 1 As shown, the charger may include a power supply plug, a temperature switch and a function box, the power supply plug and the function box are connected through a charging line, a part of the charging line is located in the function box, the function box includes a power module and a relay, the relay is connected to the charging line, the input end of the power module is connected to the charging line, and the output end of the power module is connected to the coil of the relay through the temperature switch to control the disconnection or closing of the relay. When the relay is closed, the charger can start charging; when the relay is disconnected, the charger stops charging. The relay divides the charging line into a first section and a second section. The first section of the charging line is located in the power supply plug and the function box, and the second section of the charging line is located in the function box. When the relay is closed, the first section and the second section of the charging line are connected; when the relay is disconnected, the first section and the second section of the charging line are disconnected. The second section of the charging line can be connected to a load. The input end of the power module is connected to the first section of the charging line.

[0044] When the temperature switch is not disconnected, the power module can draw power from the charging line and output voltage to the coil of the relay to energize the coil of the relay, thereby controlling the relay to close. When the temperature switch is disconnected due to overtemperature, the power module cannot output voltage to the coil of the relay to de-energize the coil of the relay, thereby controlling the relay to open.

[0045] The temperature switch may be arranged outside the power plug (for example, in a function box) or in the power plug.

[0046] In the embodiment of the present application, the temperature switch is connected between the power module and the coil of the relay, and the power module supplies power to the coil of the relay through the temperature switch. When the temperature switch is disconnected due to overtemperature, the power module cannot supply power to the coil of the relay, causing the relay to disconnect, thereby automatically disconnecting the charging line, so that the charger stops charging, which can reduce the safety risk of the charger compared to software control.

[0047] The charging cable may be an AC charging cable or a DC charging cable, and may provide AC power or DC power.

[0048] The number of relays may be 1 or at least 2.

[0049] Figure 1 The charging cable is shown with a thick line as an example.

[0050] Optionally, the charging line may include a first phase line, a second phase line and a ground line. The number of relays may be two.

[0051] See also Figure 2 , Figure 2 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 2 The charging line includes a first phase line (such as Figure 2 L1 as shown), the second phase line (such as Figure 2 L2 / N) and ground wire PE shown, Figure 2 The number of relays is two, namely, the first relay K1 and the second relay K2. Figure 2As shown, the charger includes a power supply plug, a temperature switch and a function box. The power supply plug and the function box are connected through a first phase line, a second phase line and a ground line PE. The function box includes a power supply module, a first relay K1 and a second relay K2. The first relay K1 is connected in series with the first phase line, and the second relay K2 is connected in series with the second phase line. The input end of the power supply module is connected to the charging line, and the output end of the power supply module is connected to the coil 1 of the first relay K1 and the coil 2 of the second relay K2 through the temperature switch to control the opening or closing of the first relay K1 and the second relay K2. The first section of the first phase line is located in the power supply plug and the function box, the second section of the first phase line is located in the function box, and the first section of the first phase line is connected to the second section of the first phase line through the first relay K1. The first section of the second phase line is located in the power supply plug and the function box, the second section of the second phase line is located in the function box, and the first section of the second phase line is connected to the second section of the second phase line through the second relay K2. The ground line PE is located in the power supply plug and the function box. The first relay K1 is connected in series between the first segment of the first phase line and the second segment of the first phase line, and the second relay K2 is connected in series between the first segment of the second phase line and the second segment of the second phase line; the power supply module is used to draw power from the first segment of the first phase line and the first segment of the second phase line (such as Figure 2 As shown, the input end of the power module includes a first input end of the power module and a second input end of the power module, the first input end of the power module is connected to the first segment of the first phase line, and the second input end of the power module is connected to the first segment of the second phase line), and is used to power the coil 1 of the first relay K1 and the coil 2 of the second relay K2 through the temperature switch.

[0052] In the embodiment of the present application, the temperature switch is connected in series between the power module and the coil of the relay. If the temperature in the coupling area between the power supply plug and the mains socket is abnormal, the temperature is transferred to the temperature switch through heat conduction. When the temperature of the temperature switch exceeds the thermal deformation temperature of the material, the temperature switch will automatically physically disconnect. When the temperature of the temperature switch is lower than the thermal deformation temperature of the material, the temperature switch will automatically physically close. Among them, the upper temperature limit of the charger during normal operation is less than the thermal deformation temperature.

[0053] Among them, the setting of the thermal deformation temperature of the temperature switch can consider the following factors:

[0054] ① The ambient temperature of the charger is T0;

[0055] ②The power plug material of the charger must be temperature resistant to T1;

[0056] ③The power plug of the charger matches the AC power socket material with temperature resistance of T2;

[0057] ④The maximum long-term current-carrying temperature rise Tk of the charger;

[0058] Thermal deformation temperature Tb of the temperature switch: the maximum value of T2 and T1>Tb>T0+Tk.

[0059] If the temperature of the temperature switch is greater than T0+Tk, thermal deformation will occur.

[0060] Among them, the temperature switch is arranged in the power supply plug and is connected in series in the circuit of the power supply module. Exemplarily, the temperature switch can be set close to the first phase line. The temperature switch automatically disconnects after overtemperature. When there is an abnormality in the software or control module, the first relay K1 and the second relay K2 can also be disconnected, and there will be no problem of burning the power supply plug, which is safer. The temperature switch is not connected in series in the main power circuit, and the current carrying requirements and the durability requirements of the temperature switch are low, and the temperature switch has higher stability in use. Exemplarily, the temperature switch may include at least one temperature spring. The temperature switch of the embodiment of the present application may be a temperature spring, or it may be composed of multiple temperature springs connected in series. Exemplarily, the temperature switch is fixed in the power supply plug by processes such as glue filling and glue encapsulation.

[0061] The coil 1 of the first relay K1 can also be called the control coil or low-voltage coil of the first relay K1. The coil 2 of the second relay K2 can also be called the control coil or low-voltage coil of the second relay K2. When current passes through the coil 1 of the first relay K1, the first relay K1 is closed (closing can also be called pull-in), and when no current passes through the coil 1 of the first relay K1, the first relay K1 is disconnected. When current passes through the coil 2 of the second relay K2, the second relay K2 is closed, and when no current passes through the coil 2 of the second relay K2, the second relay K2 is disconnected. The temperature switch, the power module, and the coils 2 of the first relay K1 and the second relay K2 are connected in series in a loop. When the temperature switch is disconnected, the first relay K1 and the second relay K2 are disconnected. The lead position of the first end of the temperature switch is not fixed, and can be placed in the function box or in the power plug. Figure 2 The lead position of the first end of the temperature switch is in the function box, which is convenient for wiring. Only one temperature switch is assembled in the power plug, so the size and process are relatively simple and the cost is low. The lead position of the first end of the temperature switch can form an effective electrical connection with the temperature switch by welding, crimping, screwing, etc.

[0062] It should be noted that the coil 1 of the first relay K1 and the coil 2 of the second relay K2 may be different coils or the same coil. Figure 2In the example, the coil 1 of the first relay K1 and the coil 2 of the second relay K2 are different coils. When the first relay K1 and the second relay K2 are the same coil, one coil controls the opening and closing of the two relays (the first relay K1 and the second relay K2), and the first relay K1 and the second relay K2 are closed and closed at the same time.

[0063] The first phase line can be any one of L1, L2, and N, and the second phase line can be any one of L1, L2, and N. The first phase line and the second phase line are different, and at least one of the first phase line L1 and the second phase line L2 is L1. Figure 2 In one embodiment, the first phase line is L1, and the second phase line is L2 or N (neutral line). In one possible embodiment, the first phase line is L2 or N (neutral line), and the second phase line is L1.

[0064] In the embodiment of the present application, L1 and L2 are two different phases of two-phase electricity. After the power supply plug is inserted into the mains socket, the voltage difference between L1 and L2 is generally about 200V, the voltage difference between L1 and N is generally about 100V, the voltage between L1 and PE is generally about 220V, and the voltage between L2 and PE is generally about 220V.

[0065] In the embodiment of the present application, the temperature switch is connected between the power module and the coil of the relay, and the power module supplies power to the coil of the relay through the temperature switch. When the temperature switch is disconnected due to overtemperature, the power module cannot supply power to the coil of the relay, causing the relay to disconnect, thereby automatically disconnecting the charging line, so that the charger stops charging, which can reduce the safety risk of the charger compared to software control.

[0066] Optionally, the temperature switch is arranged in the power supply plug. The temperature switch is arranged in the power supply plug, and the temperature switch accurately senses the heating of the power supply plug. When the power supply plug heats up, the power supply of the coil of the relay can be disconnected through the temperature switch, thereby disconnecting the relay.

[0067] See also Figure 3 , Figure 3 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 3 is Figure 2 Based on Figure 3 As shown, in Figure 2 On the basis of, the function box also includes a first switch S1, the output end of the power module is connected to the first end of the temperature switch through the first switch S1, the second end of the temperature switch is connected to the first end of the coil of the relay, and the second end of the coil of the relay is grounded. (such as Figure 3As shown, the second end of the temperature switch is connected to the first end of the coil 1 of the first relay K1 and the first end of the coil 2 of the second relay K2, and the second end of the coil 1 of the first relay K1 and the second end of the coil 2 of the second relay K2 are grounded).

[0068] Optionally, the function box of the charger further includes: a first voltage detection module (i.e. Figure 3 Voltage detection 1 in the charging line); Voltage detection 1 is used to detect the voltage on the charging line. Figure 3 As shown, voltage detection 1 is used to detect the first phase line (such as Figure 3 The first section of L1) and the second phase line (as shown Figure 3 The voltage between the first segment of L2 or N) shown.

[0069] Optionally, the function box of the charger further includes a second voltage detection module (i.e. Figure 3 Voltage detection 2 in the temperature switch), voltage detection 2 is used to detect the voltage at the second end of the temperature switch.

[0070] Optionally, the function box further includes a control module, and the power module is also used to supply power to the control module; Figure 3 As shown, the first output end of the power module is connected to the power supply end of the control module, the second output end of the power module is connected to the first end of the first switch, the second end of the first switch is connected to the first end of the temperature switch, and the second end of the temperature switch is connected to the coil of the first relay and the coil of the second relay.

[0071] The control module is used to determine that the power plug is inserted into the mains socket according to the voltage detected by the first voltage detection module;

[0072] The control module is also used to control the first switch to close when the power plug is inserted into the mains socket and charging is ready, and to determine whether the temperature switch is open according to the voltage detected by the second voltage detection module.

[0073] The control module is a module that plays a control role in the function box, and the control module can also be called a control unit. Exemplarily, the control module can be a microcontroller unit (MCU).

[0074] The control module can determine whether the power plug is inserted into the mains socket according to the voltage detected by the voltage detection 1. Specifically, it can be determined whether the power plug is inserted into the mains socket according to the voltage between the first segment of the first phase line and the first segment of the second phase line detected by the voltage detection 1. The voltage between the first segment of the first phase line and the first segment of the second phase line can be the voltage difference between the first segment of the first phase line and the first segment of the second phase line, or the voltage difference between the first phase line and the ground line, or the voltage difference between the second phase line and the ground line.

[0075] Ready to charge is the standard for the charger to be ready for charging as specified in the charging protocol.

[0076] Optionally, the control module determines whether the power plug is inserted into the mains socket according to the pressure difference, including:

[0077] When the voltage between the first phase line and the second phase line is less than a fourth threshold, the control module determines that the power plug is not inserted into the mains socket;

[0078] When the voltage between the first phase line and the second phase line is greater than a fifth threshold, the control module determines that the power plug has been inserted into the mains socket, and the fifth threshold is greater than the fourth threshold.

[0079] In the embodiment of the present application, the fourth threshold value may be set to a value less than 50. For example, the fourth threshold value may be set to 30V.

[0080] When the first phase line is L1 and the second phase line is L2, the fifth threshold value may be set to a value greater than 150 V and less than 200 V. For example, the fifth threshold value may be set to 180 V. When the first phase line is L1 and the second phase line is N, the fifth threshold value may be set to a value greater than 50 V and less than 100 V. For example, the fifth threshold value may be set to 80 V.

[0081] If the voltage between the first phase line and the second phase line is the voltage difference between L1 and the ground line, the fifth threshold value may be set to a value greater than 150 V and less than 200 V. For example, the fifth threshold value may be set to 180V.

[0082] In the embodiment of the present application, the fourth threshold value and the fifth threshold value can be preset. The control module can accurately determine whether the power plug is inserted into the mains socket according to the fourth threshold value and the fifth threshold value.

[0083] Optionally, the control module determines whether the temperature switch is disconnected according to the voltage detected by the second voltage detection module, including:

[0084] When the voltage detected by the second voltage detection module is less than a sixth threshold, the control module determines that the temperature switch is disconnected;

[0085] When the voltage detected by the second voltage detection module is greater than a sixth threshold, the control module determines that the temperature switch is not disconnected.

[0086] In the embodiment of the present application, the control module determines whether the temperature switch is disconnected according to the voltage detected by the voltage detection 2. The voltage detection 2 detects the voltage of the first input terminal of the power module. When the temperature switch is turned on, the voltage signal is V1, and when the temperature switch is turned off, it is V2. When the voltage detected by the voltage detection 2 is less than the sixth threshold value, it is confirmed that the temperature switch is disconnected, and when the voltage detected by the voltage detection 2 is greater than the sixth threshold value, it is confirmed that the temperature switch is turned on.

[0087] Exemplarily, if the first phase line is L1 in the two-phase electricity, when the temperature switch is turned on, the voltage V1 detected by the voltage detection 2 is about 220 V, and when the temperature switch is turned on, the voltage V2 detected by the voltage detection 2 is about 0 V. The sixth threshold value can be set to any value between 20-220 V. Exemplarily, the sixth threshold value can be set to 100 V.

[0088] In the embodiment of the present application, the temperature switch is connected in series between the power module and the coil of the relay, and the power module supplies power to the coil 1 of the first relay K1 and the coil 2 of the second relay K2 through the first switch S1. When the temperature switch is disconnected due to overtemperature, the power module cannot supply power to the coil 1 of the first relay K1 and the coil 2 of the second relay K2, thereby automatically disconnecting the first phase line and the second phase line, so that the charger stops charging, which can reduce the safety risk of the charger compared with software control.

[0089] Optionally, the control module is used to determine the protection strategy based on the cumulative number of times the temperature switch is disconnected after the power plug is inserted into the AC power socket; or the control module is used to determine the protection strategy based on the continuous charging time of the charger; or the control module is used to determine the protection strategy based on the cumulative number of times the temperature switch is disconnected after the power plug is inserted into the AC power socket and the continuous charging time of the charger.

[0090] In an embodiment of the present application, when the temperature switch is disconnected, the control module can determine the protection strategy based on the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket. Generally speaking, the greater the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, the greater the protection. For example, each time the temperature switch is disconnected, as the cumulative number of times increases, the next time the temperature switch is closed, the operating current of the charger will be lower than when the temperature switch was last closed, or even reduced to 0. The disconnection of the temperature switch may be caused by the high operating current of the charger (the high operating current of the charger may cause the temperature to rise). By reducing the operating current of the charger, the temperature switch is not easily disconnected, thereby extending the working time of the charger. In the event of a charger failure, the charger can be allowed to charge the vehicle with as much electricity as possible.

[0091] When the temperature switch is disconnected, the control module can also determine the protection strategy based on the continuous charging time of the charger. The continuous charging time of the charger refers to the continuous charging time of the charger before the temperature switch is disconnected for the last time. Generally speaking, the shorter the continuous charging time of the charger, the greater the protection. For example, the smaller the working current of the charger, the greater the reduction in the working current of the charger when the temperature switch is closed next time, and it may even drop to 0. The shorter the continuous charging time of the charger, the easier it is for the temperature switch to disconnect. This may be caused by the high working current of the charger (the high working current of the charger may cause the temperature to rise). By reducing the working current of the charger, the temperature switch is not easily disconnected, thereby extending the working time of the charger. In the event of a charger failure, the charger can be charged with as much electricity as possible.

[0092] Optionally, when the power plug is inserted into the mains socket, the cumulative number of disconnections stored in the control module is 0;

[0093] After the power supply plug is inserted into the mains socket, each time the temperature switch is detected to be disconnected, the control module will add 1 to the cumulative disconnection times;

[0094] When the power plug is disconnected from the AC power socket, the accumulated disconnection times stored in the control module are reset to zero.

[0095] In the embodiment of the present application, the control module can store data of a cumulative number of disconnections. When the power plug is inserted into the mains socket, that is, when the control module is just powered on, the data of the cumulative number of disconnections is 0.

[0096] When the control module is powered (when the power plug is plugged into the mains socket), the data of the cumulative disconnection times can be increased by 1 each time the temperature switch is detected to be disconnected. When the control module is not powered (when the power plug is disconnected from the mains socket), that is, when the control module is powered off, the data of the cumulative disconnection times is cleared.

[0097] In the embodiment of the present application, it can be ensured that the cumulative number of disconnections is the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket. If the cumulative number of disconnections continues to rise (that is, it will not be reset to zero), then after the power plug is inserted into the mains socket, the charging current of the charger to the vehicle will be limited, and the charger may even stop charging the vehicle (for example, when the cumulative number of disconnections is greater than or equal to the first threshold), which does not conform to the actual usage scenario. By clearing the data of the cumulative number of disconnections when the control module is powered off, it can be ensured that the cumulative number of disconnections is re-counted from 0 each time the power plug is inserted into the mains socket, which can improve the user experience.

[0098] Voltage detection 2 can periodically detect the voltage at the second end of the temperature switch. The control module can determine whether the temperature switch is disconnected based on the voltage detected by voltage detection 2. Each time the temperature switch is detected to be disconnected, it means that each time the temperature switch is detected to be from closed to open.

[0099] The cumulative number of disconnections refers to the number of times the temperature switch is detected to be disconnected from closed after the power plug is inserted into the AC power socket. For example, the control module determines whether the temperature switch is disconnected based on the voltage detected by voltage detection 2. For example, voltage detection 2 measures the pressure difference 10 times (during these 10 measurements, the control module continues to have power, that is, the power plug and the AC power socket are continuously coupled), and the corresponding states of the temperature switch are: closed, closed, disconnected, disconnected, disconnected, closed, closed, closed, disconnected, and disconnected. The cumulative number of disconnections is 2 times.

[0100] Optionally, the control module is used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket, including:

[0101] When the cumulative disconnection times of the temperature switch is less than the first threshold, the control module determines a target current reduction strategy according to the cumulative disconnection times of the temperature switch; wherein the current reduction degree of the target current reduction strategy is positively correlated with the cumulative disconnection times of the temperature switch;

[0102] When the accumulated disconnection times of the temperature switch is greater than or equal to a first threshold, the control module determines to stop the charging strategy.

[0103] In an embodiment of the present application, the first threshold value may be pre-set. The first threshold value may be an integer greater than or equal to 2. The target current reduction strategy refers to a strategy for reducing the operating current of the charger. Each time the temperature switch is disconnected, if the cumulative number of disconnections of the temperature switch is less than the first threshold value, the next time the temperature switch is closed, the operating current of the charger will be reduced compared to the last time the temperature switch was closed.

[0104] The charging stop strategy is a strategy for the charger to stop charging. When the cumulative disconnection times of the temperature switch is greater than or equal to the first threshold, the control module can control the charger to stop working, that is, stop charging the vehicle.

[0105] For example, if the first threshold is 3, after the power plug is inserted into the mains socket, if the working current of the charger is the rated current (for example, 15A), the temperature switch is disconnected for the first time, and the cumulative disconnection times of the temperature switch is 1 time. When the temperature switch is closed next time, the working current of the charger can be controlled to be 12A. If the temperature switch is disconnected for the second time, the cumulative disconnection times of the temperature switch is 2 times. When the temperature switch is closed next time, the working current of the charger can be controlled to be 10A. If the temperature switch is disconnected for the third time, the cumulative disconnection times of the temperature switch is 3 times. When the temperature switch is closed next time, the charger can be controlled to stop working, that is, stop charging the vehicle.

[0106] Optional, see Figure 4 , Figure 4 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 4 is Figure 3 Based on Figure 4 As shown, in Figure 3 On the basis of this, the function box of the charger also includes: a control and guidance CP module; the control module is also used to determine the target duty cycle corresponding to the target current reduction strategy according to the cumulative number of disconnections of the temperature switch, and send a target CP signal to the vehicle's on-board charger through the control and guidance CP module, and the duty cycle of the target CP signal is the target duty cycle.

[0107] The CP signal is a signal sent by the control module to the on-board charger of the vehicle. The CP signal can be generated by a control pilot (CP) module, and the control signal can control the duty cycle of the CP signal generated by the CP module.

[0108] The vehicle's on-board charger receives the CP signal. If the on-board charger recognizes that the duty cycle of the CP signal has changed (the duty cycle of the currently received CP signal is smaller than the duty cycle of the last received CP signal), the on-board charger will automatically adjust the load, thereby adjusting the operating current of the charger.

[0109] In the embodiment of the present application, the control module can send a target CP signal to an on-board charger (OBC) of the vehicle through the CP module, thereby controlling the operating current of the charger.

[0110] The greater the cumulative disconnection times of the temperature switch, the lower the target duty cycle corresponding to the target current reduction strategy, that is, the lower the working current of the charger. The working current of the charger after the next temperature switch closure can be determined based on the cumulative disconnection times of the temperature switch. The greater the cumulative disconnection times, the more times the temperature switch overheats, and the lower the working current of the charger after the next temperature switch closure. By reducing the working current of the charger, the temperature switch is not easy to disconnect, thereby extending the working time of the charger. In the event of a charger failure, the charger can charge the vehicle as much as possible.

[0111] Exemplarily, if the first threshold is 3, after the power plug is inserted into the AC power socket, if the working current of the charger is the rated current (for example, 15A), the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 25%. When the temperature switch is disconnected for the first time, the cumulative number of disconnections of the temperature switch is 1. When the temperature switch is closed next time, the working current of the charger can be controlled to be 12A. At this time, the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 20%. When the temperature switch is disconnected for the second time, the cumulative number of disconnections of the temperature switch is 2. When the temperature switch is closed next time, the working current of the charger can be controlled to be 10A. At this time, the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 16.67%. When the temperature switch is disconnected for the third time, the cumulative number of disconnections of the temperature switch is 3 times. When the temperature switch is closed next time, the charger can be controlled to stop working. At this time, the duty cycle of the CP signal sent by the control module to the vehicle's on-board charger through the CP module is 0% or 100%, that is, charging of the vehicle is stopped.

[0112] Optional, such as Figure 4 As shown, the function box also includes a leakage detection circuit; the control module is also used to control the first switch to be disconnected when the leakage detection circuit detects that the charger is leaking.

[0113] Optional, such as Figure 4 As shown, the function box also includes a current sampling circuit; the control module is also used to control the first switch S1 to disconnect when the current on the charging line (for example, the first phase line or the second phase line) is detected by the current sampling circuit to be greater than a third threshold.

[0114] The leakage detection circuit is used to detect whether leakage occurs in the first phase line and the second phase line. The current sampling circuit is used to detect the current of the first phase line, so as to detect whether the charging current is abnormal.

[0115] The control module is also used to control the first switch S1 to be disconnected when the leakage detection circuit detects that the charger is leaking electricity. This can achieve the purpose of controlling the first relay K1 and the second relay K2 to be disconnected when the leakage detection circuit detects that the charger is leaking electricity, thereby improving the charging safety of the charger.

[0116] Optional, such as Figure 4 As shown, the charger further includes a vehicle plug. When the vehicle plug is inserted into a vehicle socket, the charger and the vehicle establish a charging circuit.

[0117] Among them, the vehicle socket can be connected to the vehicle's on-board charger OBC, so that the charger and the vehicle establish a charging circuit. The charging system can establish a charging circuit between the AC power socket, power supply plug, function box, vehicle plug, vehicle socket, vehicle's OBC and power battery to realize charging of the power battery.

[0118] The vehicle plug is coupled with the vehicle socket to transmit the electrical energy of the mains socket to the vehicle's power battery and storage battery to achieve the charging function.

[0119] The function box and the power supply plug, the function box and the vehicle plug can be an integrated structure, or they can be Figure 4 The functional box shown is between the power supply plug and the vehicle plug, which is not limited in the embodiment of the present application.

[0120] The charger includes: a power supply plug, a function box, and a vehicle plug, wherein the power supply plug and the function box are connected via a power cord ( Figure 4 L1, L2 / N are connected to the power module and the power cable connected to the power module), and the function box and the vehicle plug are connected through the charging cable ( Figure 4 Connect the cable connected to L1, L2 / N, PE, and CP of the vehicle plug.

[0121] Optional, such as Figure 4 As shown, the CP module includes a CP detection and control circuit, a second switch S2, a first resistor R1 and a third switch S3; the first output end of the CP detection and control circuit is connected to the first end of the second switch S2, the second output end of the CP detection and control circuit is connected to the second end of the second switch S2, the third end of the second switch S2 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the first end of the third switch S3, and the second end of the third switch S3 is connected to the CP port of the vehicle plug.

[0122] In the embodiment of the present application, the first output terminal of the CP detection and control circuit can output a voltage of 12V, and the second output terminal of the CP detection and control circuit can output a pulse width modulation (PWM) signal.

[0123] Among them, the power supply plug of the charger and the mains socket are coupled and plugged to form an electrical connection. At this time, the temperature switch is in a normally closed state. At this time, the first switch S1 can be in a normally open state or a normally closed state. When the first switch S1 is in a normally open state and the power supply plug is connected to the mains socket, the coil 1 of the first relay K1 and the coil 2 of the second relay K2 are not powered. When charging is ready, the control module controls the first switch S1 to close, and the power supply module supplies power to the coil 1 of the first relay K1 and the coil 2 of the second relay K2, and the first relay K1 and the second relay K2 are energized. When the first switch S1 is in a normally closed state, the voltage at the first detection point of the CP can be used to determine whether the vehicle plug is connected to the vehicle socket. If the connection fails, the first switch S1 can be disconnected immediately.

[0124] The first detection point of CP is Figure 4 The connection point of the second switch S2 and the first resistor R1. After the vehicle plug and the vehicle socket are connected together, the voltage of the first detection point of CP will change. The control module can determine whether the vehicle plug and the vehicle socket are coupled by detecting the voltage at the first detection point of CP. If coupled, the first switch S1 is kept in a normally closed state. If not coupled, the first switch S1 is disconnected to reduce the risk of electric shock.

[0125] Optionally, when the cumulative number of disconnections of the temperature switch is greater than or equal to 1, the control module sends a stop charging message to the vehicle to cause the charger to stop charging the vehicle.

[0126] In the embodiment of the present application, as long as the temperature switch is detected to be disconnected, a stop charging message will be sent to the vehicle to stop the charger from charging the vehicle. When the temperature switch is detected to be disconnected, the charger stops charging the vehicle. After the temperature switch over-temperature protection is disconnected, the charger stops working to prevent the charger from overheating the temperature switch again, thereby protecting the charger and preventing the temperature switch from being repeatedly disconnected and closed, thereby increasing the service life of the temperature switch.

[0127] The control module sends a stop charging message to the vehicle so that the charger stops charging the vehicle. Specifically, the control module sends a specific CP signal to the on-board charger of the vehicle through the CP module.

[0128] Optionally, the specific CP signal may be a CP signal specified in a national standard: for example, a CP signal with a duty cycle of 100% or 0%.

[0129] Optionally, the specific CP signal can be a CP signal agreed upon by the charger and the vehicle: for example, a CP signal with a duty cycle of 100% and a duty cycle of 20% alternating. Exemplarily, the first half of the CP signal is a duty cycle of 100%, and the second half is a duty cycle of 20%.

[0130] Optionally, the control module determines a protection strategy according to the continuous charging time of the charger, including:

[0131] When the continuous charging time of the charger is greater than the second threshold, determining a target time interval within which the continuous charging time of the charger falls, and determining a target charging current corresponding to the target time interval; wherein the target charging current is positively correlated with the target time interval;

[0132] When the continuous charging time of the charger is less than or equal to the second threshold, the control module determines to stop the charging strategy.

[0133] In the embodiment of the present application, the control module has a timing function, which can count the continuous charging time of the charger.

[0134] Exemplarily, N different duration values ​​can be set, taking N=3 as an example: T1=60 minutes (min), T2=180min, T3=480min. Different duration values ​​can correspond to different charging currents. T1 duration: 8A; T2 duration: 12A; T3 duration: 15A. It should be noted that N and each duration value TN can be defined according to the manufacturer's over-temperature protection strategy.

[0135] In a charging procedure, the voltage is continuously detected and the continuous charging time t of the charger is recorded. The continuous charging time t is the charging time during which the temperature switch is closed and opened.

[0136] During the continuous charging process, if the temperature switch is disconnected due to overtemperature, if the continuous charging time of the charger is t=100min, the time is compared with the preset time value. At this time, T1<t≤T2 (the continuous charging time t of the charger is in the interval of T1~T2), the control unit adjusts the duty cycle of the CP signal, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the charging current 8A corresponding to T1.

[0137] If the continuous charging time of the charger is t=240min, the time is compared with the preset time value. At this time, T2<t≤T3 (the continuous charging time t of the charger is in the interval of T2~T3), the control unit adjusts the duty cycle of the CP signal, waits for the plug temperature to drop to the temperature switch to close again, and then charges according to the charging current 12A corresponding to T2.

[0138] If the continuous charging time of the charger is t=500min, the time is compared with the preset time value. At this time, T3<t (the continuous charging time t of the charger is in a range greater than T3), the control unit adjusts the duty cycle of the CP signal, waits for the plug temperature to drop to the temperature switch to close again, and then charges according to the charging current 15A corresponding to T3.

[0139] If the continuous charging time of the charger is t=40min, the time is compared with the preset time value. At this time, t≤T1 (the continuous charging time t of the charger is in the interval less than or equal to T1). At this time, the control unit can control the duty cycle of the CP signal, wait for the plug temperature to drop to the temperature switch to close again, and then charge according to the set minimum current (<8A), or adjust the duty cycle of the CP signal to 100% or 0% to stop charging.

[0140] In the embodiment of the present application, before the temperature switch is disconnected, if the continuous charging time of the charger is shorter, it indicates that the temperature switch is prone to over-temperature protection, and the working current of the charger is reduced after the temperature switch is closed next time. By reducing the working current of the charger, the temperature switch is not easily disconnected, thereby extending the working time of the charger. In the event of a charger failure, the charger can charge the vehicle as much electricity as possible.

[0141] Optionally, the control module determines a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket and the continuous charging time of the charger, including:

[0142] The charging current after the temperature switch is closed next time is determined according to the accumulated number of disconnections of the temperature switch and the continuous charging time of the charger; wherein, the charging current after the temperature switch is closed next time is negatively correlated with the accumulated number of disconnections, and the charging current after the temperature switch is closed next time is positively correlated with the continuous charging time.

[0143] Exemplarily, N different duration values ​​can be set, taking N=3 as an example: T1=60 minutes (min), T2=180min, T3=480min. Different duration values ​​can correspond to different charging currents. T1 duration: 8~10A; T2 duration: 12~14A; T3 duration: 15~17A. It should be noted that: N and each duration value TN can be defined according to the manufacturer's over-temperature protection strategy.

[0144] In a charging procedure, the voltage is continuously detected and the continuous charging time t of the charger is recorded. The continuous charging time t is the charging time during which the temperature switch is closed and opened.

[0145] During the continuous charging process, if the temperature switch is disconnected due to overtemperature, if the cumulative disconnection times of the temperature switch is 1, the continuous charging time of the charger is t=100min, and the time is compared with the preset time value. At this time, T1<t≤T2 (the continuous charging time t of the charger is in the interval of T1-T2), the control unit adjusts the duty cycle of the CP signal, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the maximum charging current 10A corresponding to T1. If the cumulative disconnection times of the temperature switch is 2, the continuous charging time of the charger is t=100min, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the medium charging current 9A corresponding to T1. If the cumulative disconnection times of the temperature switch is 3, the continuous charging time of the charger is t=100min, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the minimum charging current 8A corresponding to T1. If the cumulative disconnection times of the temperature switch is 4, the continuous charging time of the charger is t=100min, and waits for the plug temperature to drop to the temperature switch to close again before charging current is 0 (i.e., charging is stopped).

[0146] If the cumulative number of disconnections of the temperature switch is 1, the continuous charging time of the charger is t=240min, and the time is compared with the preset time value. At this time, T2<t≤T3 (the continuous charging time t of the charger is in the interval of T2-T3), then the control unit adjusts the duty cycle of the CP signal, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the maximum charging current 14A corresponding to T2. If the cumulative number of disconnections of the temperature switch is 2, the continuous charging time of the charger is t=240min, and then waits for the plug temperature to drop to the temperature switch to close again before charging according to the medium charging current 13A corresponding to T2. If the cumulative number of disconnections of the temperature switch is 3, the continuous charging time of the charger is t=240min, and then waits for the plug temperature to drop to the temperature switch to close again before charging according to the minimum charging current 12A corresponding to T2. If the cumulative number of disconnections of the temperature switch is 4, the continuous charging time of the charger is t=240min, and then waits for the plug temperature to drop to the temperature switch to close again before charging current is 0 (i.e., charging is stopped).

[0147] If the cumulative number of disconnections of the temperature switch is 1, the continuous charging time of the charger is t=500min, and the time is compared with the preset time value. At this time, T3<t (the continuous charging time t of the charger is in a range greater than T3), the control unit adjusts the duty cycle of the CP signal, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the maximum charging current 17A corresponding to T3. If the cumulative number of disconnections of the temperature switch is 2, the continuous charging time of the charger is t=500min, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the medium charging current 16A corresponding to T3. If the cumulative number of disconnections of the temperature switch is 3, the continuous charging time of the charger is t=500min, and waits for the plug temperature to drop to the temperature switch to close again before charging according to the minimum charging current 15A corresponding to T3. If the cumulative number of disconnections of the temperature switch is 4, the continuous charging time of the charger is t=500min, and waits for the plug temperature to drop to the temperature switch to close again before charging current is 0 (i.e., charging is stopped).

[0148] For the i-th continuous charging time ti, according to the interval in which the value of ti is located, charging is performed or charging is stopped according to the maximum current, the medium current or the minimum current corresponding to the interval.

[0149] In the embodiment of the present application, before the temperature switch is disconnected, when the continuous charging time of the charger is the same, the greater the cumulative disconnection times of the temperature switch, the lower the working current of the charger after the next temperature switch is closed. Taking into account the cumulative disconnection times of the temperature switch and the continuous charging time of the charger, the temperature switch is not easily disconnected by reducing the working current of the charger, thereby extending the working time of the charger, and in the event of a charger failure, the charger can charge the vehicle as much as possible.

[0150] Optionally, when the control module sends a stop charging message to the vehicle, the vehicle sends a notification message to the user terminal, where the notification message is used to notify the user terminal that a charging failure occurs in the charger.

[0151] In the embodiment of the present application, the control module sends a stop charging message to the vehicle, so that the vehicle adjusts the load, thereby causing the charger to stop charging the vehicle. The vehicle can establish communication with the user terminal. For example, the vehicle can notify the user through the cloud platform or APP (display the notification message on the user terminal), and can also display the notification message on the vehicle's instrument or display screen when the vehicle is started next time.

[0152] When the vehicle detects that the duty cycle of the CP signal is abnormal (such as stopping charging with a duty cycle of 100% or 0%), it can actively communicate with the user (such as through a mobile phone APP or instrument or vehicle display, etc.), warn of charging failures, and remind the user to actively check the charging system (such as the power plug, AC power socket) and perform maintenance on the charging device and power socket.

[0153] The embodiments of the present application can promptly notify the user when an over-temperature failure occurs in the charger, thereby improving the user experience.

[0154] See also Figure 5 , Figure 5 It is a schematic diagram of the structure of another charger provided in an embodiment of the present application. Figure 5 is Figure 4 Based on Figure 5 As shown, in Figure 4 On the basis of, the function box of the charger also includes: a prompt module, when the temperature switch is disconnected, the function box is used to send a prompt message through the prompt module, and the prompt message is used to prompt that an over-temperature fault occurs in the power supply plug.

[0155] Among them, the prompt module can be at least one of a voice module and a display module. The prompt module can send at least one of a voice prompt message, a text prompt message, and an optical prompt message. The prompt message can include at least one of a voice prompt message and a text prompt message, and the prompt message can prompt that the power plug has an overtemperature fault. The user can be prompted in time through the prompt module on the function box. Exemplarily, the prompt module can include a display module, and the display module can send sound and light prompt messages.

[0156] See also Figure 6 , Figure 6 It is a flow chart of a method for detecting disconnection of a temperature switch provided in an embodiment of the present application. Figure 6 The method can be based on Figure 5 The charger shown. Figure 6 As shown, the method includes the following steps.

[0157] 601, start.

[0158] 602, whether charging is ready. If yes, go to step 603; if no, go to step 607.

[0159] 603, the control module closes the first switch S1.

[0160] 604, the control module detects whether there is voltage at the second end of the temperature switch through the second voltage detection module. If yes, execute step 605; if no, execute step 606.

[0161] 605, the temperature switch is closed and charging is connected normally until charging is completed.

[0162] 606, the control module confirms that the temperature switch is disconnected, issues an over-temperature prompt, controls the CP module to adjust the duty cycle of the CP signal and counts the cumulative number of disconnections.

[0163] 607, end.

[0164] In the embodiment of the present application, when the temperature switch is detected to be disconnected, an over-temperature prompt can be given, and the CP module can be controlled to adjust the duty cycle of the CP signal and count the cumulative number of disconnections, thereby reducing the working current of the charger before the next temperature switch is closed. By reducing the working current of the charger, the temperature switch is not easily disconnected, thereby extending the working time of the charger, and in the event of a charger failure, the charger can charge the vehicle as much as possible.

[0165] The embodiment of the present application also provides a charging system, which may include the above charger and a vehicle. The charger may charge a power battery of the vehicle.

[0166] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0167] In the several embodiments provided in this application, it should be understood that the disclosed charger and charging system can be implemented in other ways. For example, the charger embodiments described above are only schematic, such as the division of units, which is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

Claims

1. A charger, characterized in that: The invention comprises a power supply plug, a temperature switch and a function box, wherein the power supply plug and the function box are connected via a charging line, a part of the charging line is located in the function box, the function box comprises a power supply module and a relay, the relay is connected to the charging line, an input end of the power supply module is connected to the charging line, and an output end of the power supply module is connected to a coil of the relay via the temperature switch to control the opening or closing of the relay.

2. The charger according to claim 1, characterized in that: The temperature switch is disposed in the power supply plug.

3. The charger according to claim 1 or 2, characterized in that: The function box further includes a first switch, through which the output end of the power module is connected to the first end of the temperature switch, and the second end of the temperature switch is connected to the coil of the relay.

4. The charger according to claim 3, characterized in that: The functional box further includes a first voltage detection module; the first voltage detection module is used to detect the voltage on the charging line.

5. The charger according to claim 3, characterized in that: The function box further includes a second voltage detection module, and the second voltage detection module is used to detect the voltage of the second end of the temperature switch.

6. The charger according to claim 5, characterized in that: The functional box also includes a control module, and the power module is also used to supply power to the control module; The control module is used to determine that the power plug is inserted into the mains socket according to the voltage detected by the first voltage detection module; The control module is also used to control the first switch to be closed when the power plug is inserted into the mains socket and charging is ready, and to determine that the temperature switch is opened according to the voltage detected by the second voltage detection module.

7. The charger according to claim 6, characterized in that: The control module is also used to determine a protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket when the temperature switch is disconnected; Or the control module is used to determine the protection strategy according to the continuous charging time of the charger; Alternatively, the control module is used to determine the protection strategy according to the cumulative number of disconnections of the temperature switch after the power plug is inserted into the mains socket and the continuous charging time of the charger.

8. The charger according to claim 7, characterized in that: The control module is used to determine the protection strategy according to the cumulative disconnection times of the temperature switch after the power plug is inserted into the mains socket, including: When the cumulative disconnection times of the temperature switch is less than a first threshold, the control module determines a target current reduction strategy according to the cumulative disconnection times of the temperature switch; wherein the current reduction degree of the target current reduction strategy is positively correlated with the cumulative disconnection times of the temperature switch; When the accumulated disconnection times of the temperature switch is greater than or equal to the first threshold, the control module determines to stop the charging strategy.

9. The charger according to claim 8, characterized in that: The functional box also includes: a control and guidance CP module; the control module is also used to determine the target duty cycle corresponding to the target current reduction strategy according to the cumulative number of disconnections of the temperature switch, and send a target CP signal to the vehicle's on-board charger through the control and guidance CP module, and the duty cycle of the target CP signal is the target duty cycle.

10. The charger according to claim 7, characterized in that: The control module is used to determine the protection strategy according to the cumulative disconnection times of the temperature switch after the power plug is inserted into the mains socket, including: When the accumulated disconnection times of the temperature switch is greater than or equal to 1, the control module sends a charging stop message to the vehicle.

11. The charger according to claim 7, characterized in that: The control module is used to determine a protection strategy according to the continuous charging time of the charger, including: When the continuous charging time of the charger is greater than a second threshold, determining that the continuous charging time of the charger falls within a target time interval, and determining a target charging current corresponding to the target time interval; wherein the target charging current is positively correlated with the target time interval; When the continuous charging time of the charger is less than or equal to the second threshold, the control module determines a charging stop strategy.

12. The charger according to any one of claims 1 to 11, characterized in that: The function box further comprises a prompt module. When the temperature switch is disconnected, the function box is used to send a prompt message through the prompt module. The prompt message is used to prompt that an over-temperature fault occurs in the power supply plug.

13. The charger according to claim 7, characterized in that: When the power supply plug is inserted into the mains socket, the cumulative number of disconnections stored in the control module is 0; After the power supply plug is inserted into the mains socket, each time the temperature switch is detected to be disconnected, the control module adds 1 to the accumulated disconnection times; When the power supply plug is disconnected from the mains socket, the accumulated disconnection times stored in the control module are reset to zero.

14. The charger according to any one of claims 1 to 13, characterized in that: The functional box also includes a leakage detection circuit; the control module is also used to control the first switch to be disconnected when the leakage detection circuit detects that the charger is leaking.

15. The charger according to any one of claims 1 to 14, characterized in that: The functional box further includes a current sampling circuit; the control module is further configured to control the first switch to be disconnected when the current on the charging line is detected by the current sampling circuit to be greater than a third threshold.

16. The charger according to any one of claims 1 to 15, characterized in that: The charger further comprises a vehicle plug. When the vehicle plug is inserted into a vehicle socket, the charger establishes a charging circuit with the vehicle.

17. A charging system, characterized in that: The invention comprises a charger and a vehicle as claimed in any one of claims 1 to 16.

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