Temperature protection system and temperature protection method for a charging device

Abstract

The application discloses a temperature protection system and method of a charging device, and the temperature protection system of the charging device comprises a charging control module, an AC power plug, an internal temperature sensor of the AC power plug, a temperature switch, an internal temperature sensor of the charging device, a switch module and a TEC refrigerating device, and the charging control module is connected with the internal temperature sensor of the AC power plug, the internal temperature sensor of the charging device, the switch module and the TEC refrigerating device. The application protects the charging device by the temperature protection system and method, and the initial temperature and the instant temperature of the charging device and the power plug are monitored, so that the accuracy of temperature protection of the charging device is improved, and the function of active capacity reduction and active cooling is provided, so that the safety hidden danger of the charging plug and the charging device caused by over-temperature is avoided, and the use safety of the charging device is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of temperature protection of new energy electric vehicle charging devices, and particularly relates to a temperature protection system and a temperature protection method of a charging device. BACKGROUND

[0002] With the continuous progress and development of society, people's environmental protection consciousness is becoming stronger and stronger, and new energy power vehicles, as a kind of environmentally friendly travel transportation tool, are being applied more and more widely. New energy electric vehicles mainly use electric energy as a power source for driving.

[0003] The new energy electric vehicle charging device is a device for charging the vehicle battery of the new energy electric vehicle. In order to ensure the safety of the charging device in use, the charging device needs to have good over-temperature protection, leakage protection and waterproof and dustproof performance. At present, the common new energy electric vehicle charging device mainly adopts the way of setting a temperature sensor inside the charging device or setting a temperature sensor at the power plug part to detect the temperature of the charging device. During the use of the charging device, whether the charging device is in an over-temperature state is judged by the detection data of the temperature sensor, so as to protect the charging device from over-temperature.

[0004] However, the single use of temperature sensors to detect the charging device or the charging plug cannot accurately protect the temperature of the charging device. For example, when the charging device is used in an area with large temperature difference between indoor and outdoor, the charging device and the new energy power vehicle are placed outdoors, the outdoor temperature is-40℃, and the indoor temperature is 10℃. When the charging device and the new energy power vehicle are transferred from the outside to the indoor use, the temperature difference between the inside and the outside of the charging device can reach 50℃. According to experiments, the charging device stored outdoors needs to wait for 1h or charge for 20min to reach room temperature after being transferred to the indoor. That is to say, during the process of charging the charging device for 20min to reach room temperature, the charging device is in a temperature protection state. However, in fact, this stage is an abnormal temperature protection alarm caused by the temperature difference between indoor and outdoor, rather than a temperature protection caused by charging abnormality.

[0005] For another example, in the case of excessive charging current or short circuit, the difference between the rapid temperature rising rate of the charging device and the response time of the temperature sensor, the single temperature protection method according to the temperature sensor detection data cannot respond quickly. However, in the case of excessive charging current or short circuit, the charging device will have a transient temperature rise. According to experiments, the temperature rising rate is generally 21℃ / min under the abnormal current of 40A. After 2min under the abnormal current of 40A, the charging cable will have a phenomenon of insulation layer peeling, cable short circuit, fire and other phenomena. Therefore, the transient temperature rise will cause great safety risk in the charging process of the charging device.

[0006] Most of the existing charging device temperature protection systems and temperature protection methods are single, and are easily affected by environmental temperature difference, short-circuit abnormal rapid heating, detector failure and protection switch failure during use, resulting in poor accuracy of over-temperature protection effect, poor temperature protection performance of the charging device and low use safety of the charging device.

[0007] Therefore, in view of the above technical problems, it is necessary to provide a charging device temperature protection system and temperature protection method. SUMMARY

[0008] The purpose of the present application is to provide a charging device temperature protection system and temperature protection method to solve the problem of poor charging device temperature protection safety.

[0009] To achieve the above purpose, the technical scheme provided by an embodiment of the present application is as follows:

[0010] A charging device temperature protection system, comprising a charging control module, an AC power plug, an AC power plug internal temperature sensor, a temperature switch, a charging device internal temperature sensor, a switch module and a TEC cooler.

[0011] The charging control module is connected with the AC power plug internal temperature sensor, the charging device internal temperature sensor, the switch module and the TEC cooler.

[0012] The temperature switch is arranged in the AC power plug, and is connected in series between an electricity connection tab (AC_L) of the AC power plug and an L cable.

[0013] The switch module is used for on-off control of the power supply loop during charging, and is a relay having two groups of contacts and a control end.

[0014] The TEC cooler is attached to the surface of the switch module, and has a silent heat dissipation function.

[0015] Further, the charging control module is used for receiving and processing information of the AC power plug internal temperature sensor and the charging device internal temperature sensor.

[0016] Further, the AC power plug internal temperature sensor and the charging device internal temperature sensor are both thermistors, the AC power plug internal temperature sensor is used to detect the initial temperature and the instant temperature of the power plug during the charging process, and the charging device internal temperature sensor is used to detect the initial temperature and the instant temperature of the charging device during the charging process.

[0017] Further, the temperature switch is in a closed state initially, and when the temperature of the temperature switch itself and the surrounding environment exceeds a protection threshold, the temperature switch is turned to an open state, and when the temperature of the temperature switch itself and the surrounding environment decreases to a recovery threshold, the temperature switch is turned to the closed state.

[0018] A temperature protection method of a charging device, comprising the temperature protection system, further comprising the following steps.

[0019] S1. In the process of temperature protection of the charging device, the charging control module is used to control the charging device internal temperature sensor to periodically collect the initial temperature and the instant temperature of the charging device with 20 ms as a period, the collected initial temperature and instant temperature are subjected to software filtering processing of the charging control module to obtain accurate temperature sampling results, and whether the charging device is in a charging state is detected and judged according to the change of the instant temperature value of the charging device.

[0020] S2. When the charging device is not in the charging state, the instant temperature value is recorded and taken as an environmental reference temperature value, when the charging device is in the charging state, whether the charging time of the charging device is full one unit time is detected, when the charging time of the charging device is full one unit time, whether the charging time is full one unit time for the first time is judged, otherwise, the charging time of the charging device is continuously detected until the charging time of the charging device is full one unit time.

[0021] S3. When the charging time of the charging device is full one unit time for the first time, the instant temperature value is compared with the environmental reference temperature value to judge whether the temperature rise value is greater than a set value, when the charging time of the charging device is not full one unit time for the first time, the instant temperature value is compared with the temperature value of the last unit time, and similarly, whether the temperature rise value is greater than the set value is judged.

[0022] S4. When the temperature rise value is greater than the set value, the number of times that the temperature rise value is greater than the set value is recorded, and whether the number of times that the temperature rise value is greater than the set value is full 3 times is judged, when the temperature rise value is not greater than the set value, the instant temperature value is recorded and taken as the data of the last unit time for next comparison.

[0023] S5, when the temperature rise value is greater than the set value for 3 times, the temperature protection system controls the switch module to disconnect the power supply circuit, and records the instant temperature value as the temperature value of the last unit time; when the temperature rise value is not greater than the set value for 3 times, the instant temperature value is recorded as the temperature value of the last unit time.

[0024] Further, the software filter adopts a recursive form of 5-byte sampling sliding window sampling filter algorithm, removes two extreme values to calculate the average temperature, and obtains a more accurate temperature sampling result. The accurate temperature sampling result records: the first temperature information record is the initial temperature value, i.e. the environmental reference temperature; every time a temperature information sent by the temperature sensor is received, the instant temperature value is recorded.

[0025] Further, the unit time is one hour after the charging control module judges that the charging device starts to charge, and the unit time period is 30 seconds, i.e. the cumulative charging time is judged every 30 seconds whether it is full of a unit time.

[0026] Further, the temperature protection method is self-adaptive to the environmental temperature of the charging device, i.e. the temperature rise change of the temperature sensor detection component is judged in combination with the environmental temperature condition to perform temperature rise protection and over-temperature protection. The temperature rise protection is that the charging control module compares the instant temperature value with the initial temperature value to judge that the temperature change in the unit time in the AC power plug and the charging device is greater than the temperature rise set value, i.e. the software algorithm calculates the temperature rise rate according to the two-dimensional coordinate system of the time data and the temperature data to depict the temperature rise curve, when the temperature rise rate in the unit time exceeds the protection threshold, the temperature rise protection is performed, the charging control module judges that the temperature rise rate is abnormal for multiple times, i.e. the temperature rise rate protection threshold is exceeded for multiple times, the temperature rise protection is that the charging control module triggers the stop charging action, and the temperature rise set value is 16-25℃.

[0027] Further, the over-temperature protection is that the charging control module judges that the instant temperature exceeds the over-temperature protection threshold, controls the switch module to disconnect the power supply circuit, and controls the switch module to close the power supply circuit when the instant temperature falls to the over-temperature protection recovery threshold.

[0028] Further, the charging control module judges that the temperature change in unit time in the AC power plug and the charging device is lower than the temperature rise recovery value or the charging control module judges that the instant temperature in the AC power plug and the charging device is lower than the over-temperature protection recovery threshold value, and the charging control module actively reduces the power and actively cools, the charging control module opens the active power reduction and cooling setting, the charging control module judges that the temperature rise rate or the instant temperature still exceeds the protection threshold value for multiple times, that is, the charging device is abnormal and is not removed, the charging control module controls the switch module to disconnect the power supply circuit and disconnect the charging, the temperature rise recovery value is 6-15 DEG C, and the temperature rise rate protection threshold value is 5-6 DEG C / min.

[0029] Compared with the prior art, the application has the following advantages:

[0030] The application protects the charging device by the temperature protection system and the temperature protection method, the initial temperature and the instant temperature of the charging device and the power plug are monitored, the accuracy of the temperature protection of the charging device is improved, the active power reduction and the active cooling function are provided, the safety hazard caused by the over-temperature of the charging plug and the charging device is avoided, and the use safety of the charging device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0032] Figure 1 It is an embodiment of the application, a structure diagram of a temperature protection system of a charging device;

[0033] Figure 2 It is an embodiment of the application, a flow chart of a temperature protection method of a charging device;

[0034] Figure 3 It is another embodiment of the application, a structure diagram of a temperature protection system and a temperature protection method of a charging device;

[0035] Figure 4 It is Figure 3 a structure diagram of A in the figure;

[0036] Figure 5 It is Figure 3 a structure diagram of B in the figure;

[0037] Figure 6 It is Figure 3Structure schematic view at C.

[0038] In the figure: 1. charging control module, 2. AC power plug, 3. AC power plug internal temperature sensor, 4. temperature switch, 5. charging device internal temperature sensor, 6. switch module, 7. TEC refrigerator, 8. charging protection shell, 9. cooling mechanism, 901. cooling fan, 902. communication wire, 903. driving power supply, 904. power supply connecting wire, 905. heat conduction protection cover, 906. thermal expansion conductive switch, 10. emergency power-off protection mechanism, 1001. temperature sensing piece, 1002. expansion control layer, 1003. compressed liquid storage cylinder, 1004. compression piece, 1005. explosion-proof storage tank, 1006. nozzle, 1007. blocking piece, 1008. connecting driving piece, 1009. control hydraulic cylinder, 1010. liquid guide pipe. DETAILED DESCRIPTION

[0039] The present application will be described in detail below with reference to the various embodiments shown in the drawings. However, the embodiments do not limit the present application, and the changes made by those of ordinary skill in the art in structure, method, or function based on the embodiments are included in the protection scope of the present application.

[0040] Example 1

[0041] The present application discloses a temperature protection system of a charging device, as shown in the figure, comprising a charging control module 1, an AC power plug 2, an AC power plug internal temperature sensor 3, a temperature switch 4, a charging device internal temperature sensor 5, a switch module 6, and a TEC refrigerator 7. Figures 1-6 As shown in the figure, the charging control module 1 is connected with the AC power plug internal temperature sensor 3, the charging device internal temperature sensor 5, the switch module 6, and the TEC refrigerator 7.

[0042] As shown in the figure, the charging control module 1 is connected with the AC power plug internal temperature sensor 3, the charging device internal temperature sensor 5, the switch module 6, and the TEC refrigerator 7. Figure 1 As shown in the figure, the charging control module 1 is connected with the AC power plug internal temperature sensor 3, the charging device internal temperature sensor 5, the switch module 6, and the TEC refrigerator 7.

[0043] Specifically, the switch module 6 is used for on-off control of the power supply loop during charging, and the switch module 6 is a relay having two groups of contacts and a control end, the two groups of contacts are respectively connected in series between the two power connection tabs (AC_L, AC_N) of the AC power plug 2 and the charging device power supply loop, and the control end is connected with the charging control module 1.

[0044] As shown in the figure, the charging control module 1 is connected with the AC power plug internal temperature sensor 3, the charging device internal temperature sensor 5, the switch module 6, and the TEC refrigerator 7.

[0045] As shown in the figure, the charging control module 1 is connected with the AC power plug internal temperature sensor 3, the charging device internal temperature sensor 5, the switch module 6, and the TEC refrigerator 7. Figure 1As shown, the TEC cooler 7 is attached to the surface of the switch module, and the TEC cooler 7 has heat dissipation and silence.

[0046] Specifically, the TEC cooler 7 includes a TEC, a heat dissipation copper or heat pipe connected to the cold end of the TEC, a heat sink connected to the hot end of the TEC, and a temperature zone thermal insulation material.

[0047] Preferably, the temperature zone thermal insulation material is preferably thermal insulation cotton.

[0048] The charging control module 1 is used to receive and process information of the AC power plug internal temperature sensor 3 and the charging device internal temperature sensor 5.

[0049] Specifically, the AC power plug internal temperature sensor 3 and the charging device internal temperature sensor 5 are both thermistors, the AC power plug internal temperature sensor 3 is used to detect the initial temperature and the real-time temperature of the AC power plug 2 during the charging process, and the charging device internal temperature sensor 5 is used to detect the initial temperature and the real-time temperature of the charging device during the charging process.

[0050] Specifically, the temperature switch 4 is in a closed state initially, and when the temperature of the temperature switch 4 itself and the surrounding environment exceeds a protection threshold, the temperature switch 4 is turned to an open state, and when the temperature of the temperature switch 4 itself and the surrounding environment decreases to a recovery threshold, the temperature switch 4 is turned to a closed state.

[0051] Reference Figure 2 As shown, a temperature protection method of a charging device includes the temperature protection system, and further includes the following steps:

[0052] S1. In the process of temperature protection of the charging device, the charging control module 1 is used to control the charging device internal temperature sensor 5 to periodically collect the initial temperature and the real-time temperature of the charging device with 20 ms as a period, the collected initial temperature and real-time temperature are subjected to software filtering processing of the charging control module 1 to obtain accurate temperature sampling results, and whether the charging device is in a charging state is detected and judged according to the change of the real-time temperature value of the charging device;

[0053] S2. When the charging device is not in a charging state, the real-time temperature value is recorded as an environmental reference temperature value, when the charging device is in a charging state, whether the charging time of the charging device is full of a unit time is detected, when the charging time of the charging device is full of a unit time, whether the charging time is the first time full of a unit time is judged, otherwise, the charging time of the charging device is continuously detected until the charging time of the charging device is full of a unit time.

[0054] S3, when the charging time of the charging device is the first time to be full of a unit time, compare the instant temperature value with the ambient reference temperature value, judge whether the temperature rise value is greater than the set value, when the charging time of the charging device is not the first time to be full of a unit time, compare the instant temperature value with the temperature value of the last unit time, also, judge whether the temperature rise value is greater than the set value;

[0055] S4, when the temperature rise value is greater than the set value, record the number of times that the temperature rise value is greater than the set value, and judge whether the number of times that the temperature rise value is greater than the set value is full of 3 times, when the temperature rise value is not greater than the set value, record the instant temperature value, and take the recorded instant temperature value as the data of the last unit time for next comparison;

[0056] S5, when the number of times that the temperature rise value is greater than the set value is full of 3 times, the temperature protection system controls the switch module 6 to disconnect the power supply circuit, and records the instant temperature value as the temperature value of the last unit time, when the number of times that the temperature rise value is greater than the set value is not full of 3 times, record the instant temperature value as the temperature value of the last unit time.

[0057] Referring to Fig. 1, the temperature protection method is adaptive to the ambient temperature of the charging device, that is, the temperature rise change of the temperature sensor detection component is judged in combination with the ambient temperature condition to perform temperature rise protection and over-temperature protection. Figures 1-2 As shown in Fig. 2, the software filtering adopts a recursive form of 5-byte sampling sliding window sampling filtering algorithm, and the average value of the temperature is calculated by removing two extreme values to obtain a more accurate temperature sampling result. The accurate temperature sampling result is recorded as the initial temperature value, that is, the ambient reference temperature. The instant temperature value is recorded every time a temperature information sent by the temperature sensor is received.

[0058] As shown in Fig. 1, the unit time is one hour within which the charging control module 1 judges that the charging device starts to charge. The unit time period is 30 seconds, that is, the charging time is judged every 30 seconds.

[0059] Referring to Fig. 1, the temperature protection method is adaptive to the ambient temperature of the charging device, that is, the temperature rise change of the temperature sensor detection component is judged in combination with the ambient temperature condition to perform temperature rise protection and over-temperature protection. Figures 1-2 As shown in Fig. 1, the temperature protection method is adaptive to the ambient temperature of the charging device, that is, the temperature rise change of the temperature sensor detection component is judged in combination with the ambient temperature condition to perform temperature rise protection and over-temperature protection. The temperature rise protection is that the charging control module 1 compares the instant temperature value with the initial temperature value to judge whether the temperature change within the unit time in the AC power plug 2 and the charging device is greater than the temperature rise set value. That is, the software algorithm calculates the temperature rise rate according to the two-dimensional coordinate system of the time data and the temperature data to depict the temperature rise curve. When the temperature rise rate within the unit time exceeds the protection threshold, the temperature rise protection is performed. The charging control module 1 judges that the temperature rise rate is abnormal for multiple times, that is, the temperature rise rate exceeds the temperature rise rate protection threshold for multiple times. The temperature rise protection is that the charging control module 1 triggers the stop charging action. The temperature rise set value is 16-25℃.

[0060] Specifically, the triggering number of times of the temperature rise abnormal protection is preferably 3 times. The triggering of 3 times judges that the temperature rise is indeed abnormal, which has software robustness.

[0061] Wherein, the over-temperature protection is that when the charging control module 1 judges that the instant temperature exceeds the over-temperature protection threshold value, the switch module 6 is controlled to be disconnected, and when the charging control module 1 judges that the instant temperature falls to the over-temperature protection recovery threshold value, the switch module 6 is controlled to be connected.

[0062] Preferably, the over-temperature protection threshold value is 80℃, and the over-temperature protection recovery threshold value is 70℃.

[0063] Referring to Fig. 1, the charging device comprises an AC power plug 2, a charging control module 1, a switch module 6, a temperature sensor 5, and a cooling mechanism 9. Figures 1-2 As shown in Fig. 1, when the charging control module 1 judges that the temperature change in the AC power plug 2 and the charging device within a unit time, i.e. the temperature rise, is lower than the temperature rise recovery value, or the charging control module 1 judges that the instant temperature in the AC power plug 2 and the charging device is lower than the over-temperature protection recovery threshold value, the charging control module 1 actively reduces the power and actively cools, the charging control module 1 starts the active power reduction and cooling setting, the charging control module 1 judges that the temperature rise rate or the instant temperature still exceeds the protection threshold value for multiple times, i.e. judges that the charging device is abnormal and is not removed, the charging control module 1 controls the switch module to disconnect the power supply circuit, and disconnects the charging, the temperature rise recovery value is 6-15℃, and the temperature rise rate protection threshold value is 5-6℃ / min.

[0064] Specifically, the triggering number of the active power reduction and cooling is preferably 5 times, i.e. the charging control module 1 judges that it has been triggered for 5 times, and after the rated power charging is recovered for 5 times, it is triggered again, the charging control module 1 controls to disconnect the charging, and locks the state of the charging device, i.e. the charging cannot be recovered, which has software robustness.

[0065] Embodiment two

[0066] Referring to Fig. 1, the charging device comprises an AC power plug 2, a charging control module 1, a switch module 6, a temperature sensor 5, and a cooling mechanism 9. Figure 3 As shown in Fig. 1, the outer side of the charging control module 1 is provided with a charging protection shell 8, the charging device internal temperature sensor 5 and the switch module 6 are arranged in the charging protection shell 8, and the charging device internal temperature sensor 5 and the switch module 6 are installed and fixed by the charging protection shell 8, so as to facilitate the isolation and protection of the charging device internal temperature sensor 5 and the switch module 6 by the charging protection shell 8.

[0067] Referring to Fig. 1, the charging device comprises an AC power plug 2, a charging control module 1, a switch module 6, a temperature sensor 5, and a cooling mechanism 9. Figures 3-5 As shown in Fig. 1, one side of the charging protection shell 8 is provided with a cooling mechanism 9, the cooling mechanism 9 plays a role in cooling and protecting the charging protection shell 8, the cooling mechanism 9 comprises a pair of cooling fans 901, the operation of the pair of cooling fans 901 accelerates the air circulation of the charging protection shell 8, so as to facilitate the cooling of the charging control module 1, the charging device internal temperature sensor 5 and the switch module 6 in the charging protection shell 8.

[0068] Referring to Fig. 1, the charging device comprises an AC power plug 2, a charging control module 1, a switch module 6, a temperature sensor 5, and a cooling mechanism 9. Figures 3-5As shown, the pair of cooling fans 901 is connected with the communication wire 902, and the communication wire 902 plays a role of electrically connecting the pair of cooling fans 901, so that the pair of cooling fans 901 synchronously operates under the action of the communication wire 902.

[0069] Referring to Figures 3-5 As shown, the charging protection shell 8 is provided with the driving power supply 903, and the driving power supply 903 provides energy for the operation of the cooling fan 901.

[0070] Referring to Figures 3-4 As shown, the driving power supply 903 and the cooling fan 901 are provided with the pair of power supply connecting wires 904, and the power supply connecting wires 904 play a role of connecting the driving power supply 903 and the cooling fan 901.

[0071] Referring to Figures 3-4 As shown, the pair of power supply connecting wires 904 is connected with the heat-conducting protective cover 908, and the heat-conducting protective cover 908 plays a role of isolating and protecting the thermal expansion conductive switch 906.

[0072] Referring to Figures 3-4 As shown, the pair of heat-conducting protective covers 908 is connected with the pair of thermal expansion conductive switches 906, and the pair of thermal expansion conductive switches 906 forms the power-off protection area, so as to control the conduction state of the cooling fan 901 and the driving power supply 903, and control the expansion conduction state of the thermal expansion conductive switch 906 through the ambient temperature in the charging protection shell 8, thereby controlling the cooling state in the charging protection shell 8.

[0073] Preferably, the thermal expansion conductive switch 906 is made of platinum conductive sheet.

[0074] Referring to Figures 3-5 As shown, the charging protection shell 8 is provided with the emergency power-off protection mechanism 10, and the emergency power-off protection mechanism 10 plays a role of power-off protection for the charging protection shell 8, thereby improving the charging safety of the charging device.

[0075] Referring to Figures 3-5 As shown, the emergency power-off protection mechanism 10 includes the temperature sensing piece 1001, the temperature sensing piece 1001 is connected with the expansion control layer 1002 close to one side of the charging protection shell 8, and the expansion control layer 1002 and the temperature sensing piece 1001 form the temperature sensing control cavity, so that the expansion control layer 1002 expands under the action of the thermal expansion liquid.

[0076] Referring to Figures 3-5As shown, the temperature sensing piece 1001 is provided with a compression liquid storage cylinder 1003 between the charging protection shell 8, the compression liquid storage cylinder 1003 plays a storage role to the hydraulic fluid, and at the same time, the compression liquid storage cylinder 1003 plays a supporting and moving limiting role to the compression piece 1004.

[0077] Referring to Figures 3-5 As shown, the compression liquid storage cylinder 1003 is provided with a compression piece 1004, the compression piece 1004 is matched with the expansion control layer 1002, and the compression piece 1004 moves with the expansion of the expansion control layer 1002, so as to facilitate the compression control of the hydraulic fluid stored in the compression liquid storage cylinder 1003.

[0078] Referring to Figures 3-6 As shown, the temperature sensing piece 1001 is provided with a pair of explosion-proof storage tanks 1005, which are located below the cooling fan 901, and the explosion-proof storage tanks 1005 play a role of storing the dry powder extinguishing agent.

[0079] At the same time, the explosion-proof storage tank 1005 plays a role of dispersing and guiding the airflow generated during the operation of the cooling fan 901, thereby improving the cooling effect of the components in the charging protection shell 8.

[0080] Referring to Figures 3-6 As shown, a pair of explosion-proof storage tanks 1005 are connected with a nozzle 1006 away from the cooling fan 901, the nozzle 1006 sprays the dry powder extinguishing agent stored in the explosion-proof storage tank 1005, thereby facilitating the power-off protection of the components in the charging protection shell 8.

[0081] Referring to Figures 3-6 As shown, the nozzle 1006 is provided with a plugging piece 1007 matched with the explosion-proof storage tank 1005, and the plugging piece 1007 plays a role of on-off control to the nozzle 1006.

[0082] Referring to Figures 3-6 As shown, the plugging piece 1007 is connected with a connecting driving piece 1008, and the connecting driving piece 1008 plays a role of supporting, fixing and moving control to the plugging piece 1007.

[0083] Referring to Figures 3-6 As shown, the outer side of the connecting driving piece 1008 is provided with a control hydraulic cylinder 1009, and the control hydraulic cylinder 1009 plays a role of moving limiting and driving control to the connecting driving piece 1008.

[0084] Referring to Figures 3-6As shown, the connecting pipe 1010 is connected between the control hydraulic cylinder 1009 and the compression liquid storage cylinder 1003, and the connecting pipe 1010 serves to connect the control hydraulic cylinder 1009 and the compression liquid storage cylinder 1003, so that the hydraulic fluid in the compression liquid storage cylinder 1003 is transported into the control hydraulic cylinder 1009 under the action of the connecting pipe 1010, thereby controlling the moving and shrinking state of the connecting driving member 1008.

[0085] In specific use, when the temperature in the charging protection shell 8 is high, the thermal expansion conductive switch 906 is bent and expanded under the action of the ambient temperature, and the bending and expansion of the pair of thermal expansion conductive switches 906 is released, so as to realize electrical conduction.

[0086] Meanwhile, the temperature in the charging protection shell 8 is sensed by the temperature sensing member 1001, when the temperature in the charging protection shell 8 rises, the expansion control layer 1002 is expanded and moved under the action of the thermal expansion liquid in the temperature sensing member 1001, the compression member 1004 is driven to compress the compression liquid storage cylinder 1003 through the expansion of the expansion control layer 1002, the hydraulic fluid in the compression liquid storage cylinder 1003 is transported into the control hydraulic cylinder 1009 under the action of the connecting pipe 1010, the connecting driving member 1008 is controlled to move through the mode of transporting the hydraulic fluid, the plugging member 1007 is driven to move through the movement of the connecting driving member 1008, at this time, the nozzle 1006 is in a conducting state, the fire extinguishing dry powder stored in the explosion-proof storage tank 1005 is discharged through the nozzle 1006, meanwhile, the explosion-proof storage tank 1005 plays a role in dispersing and guiding the airflow of the cooling fan 901, in addition, the fire extinguishing dry powder discharged through the nozzle 1006 is assisted to disperse through the operation of the cooling fan 901, thereby improving the effect of power-off protection of the charging protection shell 8.

[0087] From the above technical solutions, the present application has the following beneficial effects:

[0088] The temperature protection system and the temperature protection method are used to protect the charging device, the initial temperature and the real-time temperature of the charging device and the power plug are monitored, the accuracy of temperature protection of the charging device is significantly improved, the active de-rating and active cooling functions are provided, the safety hazards caused by over-temperature of the charging plug and the charging device are avoided, and the use safety of the charging device is improved.

[0089] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments, but that the application can be implemented in other embodiments without departing from the scope of the application. The embodiments are therefore to be seen as exemplary and in no way restrictive, the scope of the application being defined by the claims below rather than by the above description, and all variations falling within the meaning and range of equivalency of the essential characteristics of the claims are therefore intended to be embraced therein.

[0090] Furthermore, it should be understood that, although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A temperature protection system of a charging device, comprising a charging control module, an AC power plug, an AC power plug internal temperature sensor, a temperature switch, a charging device internal temperature sensor, a switch module and a TEC cooler, characterized in that: the charging control module is connected with the AC power plug internal temperature sensor, the charging device internal temperature sensor, the switch module and the TEC cooler; the temperature switch is arranged in the AC power plug, the temperature switch is connected in series between an electricity connection plug (AC_L) of the AC power plug and an L cable, the temperature switch has an over-temperature protection and a control power loop L line on-off function; the switch module is used for on-off control of the power loop during charging, the switch module is a relay, has two groups of contacts and a control end, the two groups of contacts are connected in series between two electricity connection plugs (AC_L, AC_N) of the AC power plug and a charging device power loop, and the control end is connected with the charging control module; the TEC cooler is attached to the surface of the switch module, and the TEC cooler has a silent heat dissipation function; an external side of the charging control module is provided with a charging protection shell, the charging device internal temperature sensor and the switch module are arranged in the charging protection shell, one side of the charging protection shell is provided with a cooling mechanism, the cooling mechanism is used for temperature protection of the charging protection shell, and the cooling mechanism comprises a pair of cooling fans; an emergency power-off protection mechanism is arranged in the charging protection shell, the emergency power-off protection mechanism comprises a temperature sensing element, the temperature sensing element is connected with an expansion control layer on one side close to the charging protection shell, a compression storage cylinder is arranged between the temperature sensing element and the charging protection shell, a compression element is arranged in the compression storage cylinder, explosion-proof storage tanks are connected to both sides of the temperature sensing element, nozzles are connected to one side of the explosion-proof storage tanks away from the cooling fans, blocking elements are arranged in the nozzles, connecting driving elements are connected to one side of the blocking elements, control hydraulic cylinders are arranged on the outer sides of the connecting driving elements, and guide pipes are connected between the control hydraulic cylinders and the compression storage cylinder. The specific temperature protection method of the temperature protection system of the charging device is as follows: S1, in the process of temperature protection of the charging device, the charging control module is used to control the charging device internal temperature sensor to periodically collect initial temperature and real-time temperature values of the charging device with 20 ms as a period, the collected initial temperature and real-time temperature are subjected to software filtering processing of the charging control module to obtain accurate temperature sampling results, and whether the charging device is in a charging state is detected and judged according to the change of the real-time temperature value of the charging device; the software filtering adopts a 5-byte sampling sliding window filtering algorithm in a recursive form, two extreme values are removed to calculate the average value of the temperature to obtain more accurate temperature sampling results, and the accurate temperature sampling results are recorded as follows: the first temperature information is recorded as an initial temperature value, i.e. an environmental reference temperature, and the temperature information sent by the temperature sensor is received every period of time, and a real-time temperature value is recorded. ​ ​ ​ ​ ​ ​ S2, when the charging device is not in the charging state, record the instant temperature value, and take the instant temperature value as the ambient reference temperature value, when the charging device is in the charging state, detect whether the charging time of the charging device is full of a unit time, when the charging time of the charging device is full of a unit time, judge whether the charging time is the first time full of a unit time, otherwise, continue to detect the charging time of the charging device until the charging time of the charging device is full of a unit time; The unit time is one hour after the charging control module judges that the charging device starts to charge, and the unit time period is 30 seconds, that is, the accumulated charging time is judged every 30 seconds whether it is full of a unit time; S3, when the charging time of the charging device is full of a unit time for the first time, compare the instant temperature value with the ambient reference temperature value, and judge whether the temperature rise value is greater than the set value, when the charging time of the charging device is not full of a unit time for the first time, compare the instant temperature value with the temperature value of the last unit time, and similarly, judge whether the temperature rise value is greater than the set value; S4, when the temperature rise value is greater than the set value, record the number of times that the temperature rise value is greater than the set value, and judge whether the number of times that the temperature rise value is greater than the set value is full of 3 times, when the temperature rise value is not greater than the set value, record the instant temperature value, and take the recorded instant temperature value as the data of the last unit time for next comparison; S5, when the number of times that the temperature rise value is greater than the set value is full of 3 times, the temperature protection system controls the switch module to disconnect the power supply circuit, and records the instant temperature value as the temperature value of the last unit time, when the number of times that the temperature rise value is greater than the set value is not full of 3 times, record the instant temperature value as the temperature value of the last unit time; The temperature protection method is self-adaptive to the ambient temperature of the charging device, that is, the temperature rise change of the temperature sensor detection component is judged under the condition of the ambient temperature, and temperature rise protection and over-temperature protection are performed, the temperature rise protection is that when the temperature change in a unit time in the AC power plug and the charging device is greater than the temperature rise set value according to the comparison of the instant temperature value and the initial temperature value, the temperature rise rate is calculated by software algorithm according to the two-dimensional coordinate system of time data and temperature data to depict the temperature rise curve, when the temperature rise rate in a unit time exceeds the protection threshold, the temperature rise protection is performed, the charging control module judges that the temperature rise rate is abnormal for many times, that is, the temperature rise rate exceeds the temperature rise rate protection threshold for many times, the temperature rise protection is that the charging control module triggers the stop charging action; The over-temperature protection is that when the charging control module judges that the instant temperature exceeds the over-temperature protection threshold, the switch module is controlled to disconnect the power supply circuit, and when the charging control module judges that the instant temperature falls to the over-temperature protection recovery threshold, the switch module is controlled to close the power supply circuit. When the temperature change in the unit time in the AC power plug and the charging device is lower than the temperature rise recovery value, or the real-time temperature in the AC power plug and the charging device is lower than the over-temperature protection recovery threshold, the charging control module actively reduces the capacity and actively cools down, the charging control module opens the active capacity reduction and cooling setting, and the charging control module controls the switch module to disconnect the power supply circuit and disconnect the charging when the temperature rise rate or the real-time temperature exceeds the protection threshold for multiple times, that is, when it is judged that the charging device is abnormal and has not been removed.

2. The temperature protection system of a charging device according to claim 1, wherein The charging control module is used for receiving and processing information of the internal temperature sensor of the AC power plug and the internal temperature sensor of the charging device.

3. The temperature protection system of a charging device according to claim 2, wherein The internal temperature sensor of the AC power plug and the internal temperature sensor of the charging device are both thermistors, the internal temperature sensor of the AC power plug is used for detecting the initial temperature and the real-time temperature of the power plug during the charging process, and the internal temperature sensor of the charging device is used for detecting the initial temperature and the real-time temperature of the charging device during the charging process.

4. The temperature protection system of a charging device according to claim 3, wherein The initial state of the temperature switch is a closed state, the temperature switch turns to an open state when the temperature of the temperature switch itself and the surrounding environment exceeds the protection threshold, and the temperature switch turns to a closed state when the temperature of the temperature switch itself and the surrounding environment decreases to the recovery threshold.

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