Air tightness detection device, power conversion connector and vehicle

Abstract

The invention discloses an air tightness detection device, a power conversion connector and a vehicle, the air tightness detection device is suitable for the power conversion connector, the power conversion connector comprises a vehicle end electric connection device and a battery end electric connection device, and a sealed cavity can be formed when the vehicle end electric connection device and the battery end electric connection device are coupled in place. The air tightness detection device comprises an air pressure detection element communicated with the sealed cavity and a detection circuit electrically connected with the air pressure detection element; the detection circuit comprises a comparison circuit, the comparison end of the comparison circuit is connected with the output end of the air pressure detection element, and the comparison circuit is used for comparing the output voltage of the air pressure detection element with the reference voltage and can output an air leakage detection signal used for representing air leakage of the sealed cavity. If air leakage occurs, the voltage signal which can be output by the output end of the air pressure sensor is reduced, and when the voltage signal is smaller than the reference voltage, the signal output by the comparison circuit is reversed to represent that an air tightness detection signal of leakage occurs in the sealed cavity, so that air tightness detection is realized.

Description

Technical Field

[0001] The present application belongs to the field of battery replacement technology, and specifically relates to an airtightness detection device, a battery replacement connector and a vehicle. Background Art

[0002] With the development of electric vehicle battery replacement technology, as well as the advantages of short energy replenishment time and low vehicle purchase cost, electric vehicles are becoming more and more popular among users.

[0003] The electric vehicle battery swap connector is an important component of the quick-swap battery system. It is a special connector used to achieve quick electrical connection and separation between the vehicle and the quick-swap battery system. It is mainly composed of the vehicle end, the battery end and related cables. In the application of the electric vehicle battery swap mode, the battery swap connector is the only electrical interface of the battery pack, which needs to provide mixed connections of high voltage, low voltage, communication and grounding at the same time.

[0004] For driving safety, electric vehicles have strict requirements on the sealing of electrical connectors. Since the batteries of battery-swap electric vehicles are often disassembled and assembled, each disassembly and assembly will pull the sealing ring of the electrical connector used to seal the car end and the battery end. After the sealing ring has been pulled many times, the sealing effect is easily reduced, causing driving unsafety. However, the current battery-swap connectors are unable to achieve sealing detection after each battery swap, which poses a huge safety hazard.

[0005] The vehicle-end connection device and the battery-end connection device of the battery swap connector are in a sealed state when coupled in place, and can achieve a certain degree of protection through their own structure. However, the battery swap connector does not have the function of detecting its own sealing performance. When the battery swap connector is coupled in place, if there is an air leak, it may cause water to enter the battery swap connector, which may lead to serious consequences such as alarm, short circuit or even fire.

[0006] Therefore, how to accurately and quickly detect the air tightness of the battery replacement connector has become a technical problem that needs to be solved urgently. Summary of the invention

[0007] The present application provides a battery swap connector to solve the above-mentioned technical problem of how to accurately and quickly detect the air tightness of the battery swap connector.

[0008] According to the first aspect, an embodiment of the present application provides an airtightness detection device, which is suitable for the power exchange connector, and the power exchange connector includes a vehicle-end electrical connection device and a battery-end electrical connection device. The vehicle-end electrical connection device and the battery-end electrical connection device can form a sealed cavity when coupled in place. The airtightness detection device includes an air pressure detection element and an inflation device connected to the sealed cavity, and a detection circuit electrically connected to the air pressure detection element, wherein the air pressure detection element is used to detect the air pressure in the sealed cavity, and the inflation device is used to inflate air into the sealed cavity; the detection circuit includes a comparison circuit, and the comparison end of the comparison circuit is connected to the output end of the air pressure detection element, which is used to compare the output voltage of the air pressure detection element with a reference voltage, and can output a leakage detection signal used to characterize that leakage has occurred in the sealed cavity.

[0009] In this solution, the output end of the air pressure sensor is connected to the comparison end of the comparison circuit. At the same time, a reference voltage is set at the reference voltage end of the comparison circuit. When the pressure in the sealed cavity is relatively high, the output end of the air pressure sensor can output a voltage signal greater than the reference voltage, thereby causing the comparison circuit to output an airtightness detection signal indicating that the pressure in the sealed cavity is within a normal range. If the sealed cavity leaks, the voltage signal output by the output end of the air pressure sensor decreases. When it is less than the reference voltage, the signal output by the comparison circuit reverses, indicating that a leak has occurred in the output sealed cavity, thereby achieving airtightness detection.

[0010] Optionally, the detection circuit further includes: a first indication device, connected to the output end of the comparison circuit, and configured to output a first indication signal indicating that leakage occurs in the sealed cavity when triggered by the leakage detection signal.

[0011] In this solution, the leakage detection signal outputted from the output end of the comparison circuit can trigger the first indication device to output a corresponding leakage indication to remind personnel that a leakage has occurred in the power replacement connector.

[0012] Optionally, the first indication device includes an electrically connected first control switch and a first indication unit, the control end of the first control switch is connected to the output end of the comparison circuit, and when triggered by the leakage detection signal, the first control switch controls the first indication unit to output the first indication signal.

[0013] In the present solution, the first control switch is connected to the circuit where the first indicator unit is located, and the leakage detection signal outputted from the output end of the comparison circuit triggers the first control switch to turn on the circuit where the first indicator unit is located, so that the first indicator unit is powered and outputs a corresponding indication signal, thereby realizing leakage prompt by using a hardware circuit with higher reliability and lower cost.

[0014] Optionally, the detection circuit also includes: a clock control circuit, the clock control circuit including a level trigger terminal and a clock signal input terminal, wherein the level trigger terminal is connected to the output terminal of the comparison circuit, and the clock signal input terminal inputs a preset clock signal; when the preset clock signal is in a first state, the level trigger terminal is disabled; when the preset clock signal is in a second state, the level trigger terminal is enabled.

[0015] In this solution, a clock control circuit is used to determine whether the current leakage rate is a normal leakage rate. If the comparison circuit outputs a leakage detection signal within a preset time period after inflation is completed, it indicates that the leakage rate is fast and the airtightness of the sealed cavity is abnormal. After inflation is completed, if the comparison circuit outputs a leakage detection signal after exceeding the preset time period, it indicates that the leakage rate is slow and the airtightness of the sealed cavity is normal. This allows for more accurate leakage detection and prevents false detection of slow leaks.

[0016] Optionally, the detection circuit further includes a second indication device connected to the output end of the clock control circuit, and capable of outputting a second indication signal indicating leakage of the sealed cavity when triggered by a clock control trigger signal output by the clock control circuit.

[0017] In the present scheme, the input preset clock signal of the clock control circuit is used as a preset time period. Within the preset time period, that is, during the period when the preset clock signal is in a valid state, the clock control circuit can be triggered by the leakage detection signal output by the comparison circuit to indicate that the current sealing state is abnormal; if it exceeds the preset time period, that is, the preset clock signal is in an invalid state (that is, after the timing is completed), the clock control circuit cannot be triggered by the leakage detection signal output by the comparison circuit, and does not output an abnormal indication signal.

[0018] Optionally, after the preset clock signal switches to the second state, the level trigger end outputs the clock control trigger signal under the triggering of the leakage detection signal output by the comparison circuit, so as to trigger the second indication device to output the second indication signal.

[0019] In this solution, when the preset clock signal is in a valid state, that is, within a preset time period, the level trigger end outputs the clock control trigger signal under the trigger of the leakage detection signal output by the comparison circuit, so as to trigger the second indication device to output the second indication signal, which can indicate the current airtightness abnormality.

[0020] Optionally, the second indication device includes an electrically connected second control switch and a second indication unit, the control end of the second control switch is connected to the output of the clock control circuit, and when triggered by the clock control trigger signal, the second control switch controls the second indication unit to output the second indication signal.

[0021] In this solution, a control switch with high reliability and low cost is used to control the second indicating unit.

[0022] Optionally, the inflation device is connected to the output end of the comparison circuit, and the inflation device can be started to inflate the sealed cavity when triggered by the leakage detection signal.

[0023] In the solution, after a leak occurs in the sealed cavity, in order to ensure normal use, or to ensure normal use from the time the leak occurs to the time the airtight components are replaced or the power replacement connector is repaired, the sealed cavity can be automatically inflated after the leak occurs.

[0024] Optionally, the inflation device includes an inflation circuit; the inflation circuit is connected in series with a third control switch and an inflation element, the control end of the third control switch is connected to the output end of the comparator, and is closed when triggered by a leakage detection signal output by the comparator, so that the inflation element is electrically started.

[0025] In this solution, the leakage detection signal outputted from the output end of the comparator controls the third control switch to conduct the circuit of the inflatable element, thereby realizing automatic inflation, and adopts a control switch with high reliability and low cost to realize the control of automatic inflation.

[0026] Optionally, the clock signal input terminal is connected between the inflation device and the output terminal of the comparison circuit; when the preset clock signal is in the first state, the preset clock signal maintains the triggering effect of the leakage detection signal on the inflation device; when the preset clock signal is in the second state, the preset clock signal shields the triggering effect of the leakage detection signal on the inflation device.

[0027] In this solution, if leakage occurs within the preset time period, that is, when the comparison circuit outputs a leakage detection signal, inflation is not performed, so that leakage can be accurately detected when it occurs within the preset time period; if leakage occurs after exceeding the preset time period, inflation is performed. It can not only detect leakage accurately and timely, but also ensure that positive pressure is always maintained in the sealed cavity when the air pressure drops and the alarm cannot be sounded after exceeding the preset time period, and ensure that accurate alarm is sounded without inflation after the cavity leaks when the alarm time is not exceeded, and automatically inflate after the pressure in the sealed cavity is too low after exceeding the alarm time.

[0028] Optionally, a fourth control switch is further arranged between the output end of the comparison circuit and the inflation device, and the control end of the fourth control switch is connected to the clock signal input end. When the preset clock signal is in the first state, the fourth control switch is triggered to close, and when the preset clock signal is in the second state, the fourth control switch is triggered to open.

[0029] In this solution, a control switch with higher reliability and lower cost is used to realize that within a preset time period, a preset clock signal shields the triggering effect of the leakage detection signal outputted from the output end of the comparison circuit on the inflatable device; after exceeding the preset time period, the preset clock signal maintains the triggering effect of the leakage detection signal on the inflatable device. It is ensured that if the alarm time is not exceeded, the cavity leaks and an accurate alarm is given without inflation, and if the alarm time is exceeded, the sealed cavity can be automatically inflated after the pressure is too low.

[0030] Optionally, the inflation circuit is also connected to a clock signal generating end of the clock control circuit. When triggered by a trigger edge when the inflation circuit switches from an on state to an off state, the clock signal generating end enables a clock signal input end of the clock control circuit to set the preset clock signal to the second state.

[0031] In order to accurately detect the pressure leakage rate in the sealed cavity, the trigger edge of the inflation circuit switching from the open state to the disconnected state can be used to automatically output a preset start / stop signal and set the preset clock signal to the valid state, i.e., automatically start timing. This can then be used to automatically detect whether the leakage duration exceeds the preset duration after inflation is completed.

[0032] Optionally, the comparison circuit includes multiple comparators, and the comparison ends of the multiple comparators are all connected to the output end of the air pressure detection element, wherein different comparators have different reference voltages, and different comparator outputs represent airtightness detection signals of different air pressures in the sealed cavity.

[0033] In this scheme, hierarchical pressure detection inside the sealed cavity can be achieved through multiple comparators. The time intervals between the leakage detection signals output by multiple comparators can be counted to calculate the leakage rate of the sealed cavity in real time. When the leakage rate is greater than the preset rate, a prompt signal can be output before complete leakage occurs to provide early warning.

[0034] According to the second aspect, an embodiment of the present application provides a battery exchange connector, comprising a vehicle-end electrical connection device and a battery-end electrical connection device, which can form a sealed cavity when the vehicle-end electrical connection device and the battery-end electrical connection device are coupled in place; the battery exchange connector is also provided with an airtightness detection device as described in any one of the above-mentioned first aspects.

[0035] In this solution, the airtightness detection device is installed on the power exchange connector, which can realize real-time detection of the airtightness of the sealed box of the power exchange connector to prevent the entry of water vapor and dust after air leakage, which may lead to short circuits and the like.

[0036] According to a third aspect, an embodiment of the present application provides a vehicle, comprising the battery replacement connector described in the second aspect above.

[0037] In this solution, a battery swap connector with an airtightness detection device is installed on the vehicle, which can realize real-time detection of the airtightness of the sealed box of the battery swap connector during the use of the vehicle, so as to prevent the entry of water vapor and dust after air leakage, and thus cause short circuits and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0039] Figure 1 is a schematic diagram of an optional power-swap connector structure according to an embodiment of the present application;

[0040] Figure 2 is a modular schematic diagram of an optional airtightness detection device according to an embodiment of the present application;

[0041] Figure 3 is a modular schematic diagram of another optional airtightness detection device according to an embodiment of the present application;

[0042] Figure 4 is a modular schematic diagram of another optional airtightness detection device according to an embodiment of the present application;

[0043] Figure 5 is a modular schematic diagram of another optional airtightness detection device according to an embodiment of the present application;

[0044] Figure 6 is a schematic diagram of an optional clock control circuit according to an embodiment of the present application; see the revised comments in the attached figure

[0045] Figure 7 It is a modular schematic diagram of another optional airtightness detection device according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.

[0048] In addition, in this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0049] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0050] As described in the background technology, the vehicle end and the battery end of the battery swap connector are in a sealed state when coupled in place, and can achieve a certain degree of protection through its own structure, but the battery swap connector does not have the ability to detect its own sealing performance. When the battery swap connector is coupled in place, if there is an air leak, it may cause water to enter the battery swap connector, leading to serious consequences such as alarms, short circuits, or even fires.

[0051] Therefore, according to one aspect of the embodiment of the present application, an airtightness detection device is provided, which is applicable to the power replacement connector 10, such as Figure 1 As shown, the power exchange connector 10 includes a vehicle-end electrical connection device and a battery-end electrical connection device, and the vehicle-end electrical connection device and the battery-end electrical connection device can form a sealed cavity when they are coupled in place.

[0052] See also Figure 2 As shown, the airtightness detection device includes an air pressure detection element 201 and an air filling device 202 connected to the sealed cavity, and a detection circuit 20 electrically connected to the air pressure detection element 201. The detection circuit 20 includes a comparison circuit 203, a comparison end 2031 of the comparison circuit 203 is connected to the output end of the air pressure detection element 201, and is used to compare the output voltage of the air pressure detection element 201 with a reference voltage Vref, and output an airtightness detection signal for indicating whether the sealed cavity is leaking.

[0053] Exemplarily, the air pressure detection element 201 can be an air pressure sensor or a pressure difference sensor, which can be used to detect the air pressure in the sealed cavity or the pressure change in the sealed cavity by being connected to the sealed cavity. As an exemplary embodiment, the air pressure detection element 201 can output a voltage signal. Taking the air pressure sensor as an example, a voltage signal of 0-5V can be output according to different air pressure levels. In this embodiment, the output end of the air pressure sensor is connected to the comparison end 2031 of the comparison circuit 203. At the same time, a reference voltage Vref is set at the reference voltage Vref end of the comparison circuit 203. When the pressure in the sealed cavity is relatively large, the output end of the air pressure sensor can output a voltage signal greater than the reference voltage Vref, thereby making the comparison circuit 203 output an airtightness detection signal that the pressure in the sealed cavity is within a normal range. If the sealed cavity leaks, the voltage signal that can be output by the output end of the air pressure sensor decreases. When it is less than the reference voltage Vref, the signal output by the comparison circuit 203 is reversed, indicating that the airtightness detection signal of leakage in the output sealed cavity is output, thereby realizing airtightness detection.

[0054] As an exemplary embodiment, when the output end of the air pressure sensor can output a voltage signal greater than the reference voltage Vref, the comparison circuit output end 2033 outputs a high level to indicate that the pressure in the sealed cavity is within the normal range of the airtightness detection signal, and when the output end of the air pressure sensor can output a voltage signal less than the reference voltage Vref, the comparison circuit output end 2033 outputs a low level to indicate that the pressure in the sealed cavity is reduced to the leakage standard, that is, leakage occurs in the sealed cavity. In this embodiment, the high level and low level output by the comparator can be different depending on the selection of the device, and the above embodiments are only examples and do not represent all embodiments.

[0055] As an illustrative embodiment, see Figure 3 As shown, the detection circuit 20 may also include a first indication device 30, which may be connected to the output end of the comparison circuit 203, and is used to output a first indication signal indicating that a leak has occurred in the sealed cavity when triggered by the leakage detection signal. As an exemplary embodiment, the first indication device 30 may include a sound output device, a display device, and the like. When the comparison circuit output end 2033 outputs a leakage detection signal, the first indication device 30 outputs an indication signal to indicate that a leak has occurred in the power exchange connector 10.

[0056] As an alternative embodiment, see Figure 3As shown, the first indication device 30 may include an electrically connected first control switch 301 and a first indication unit 302, wherein the control end of the first control switch is connected to the output end of the comparison circuit 203, and under the triggering of the leakage detection signal, the first control switch 301 controls the first indication unit 302 to output the first indication signal.

[0057] Exemplarily, the first control switch 301 can be connected to the working circuit of the first indication unit 302, and the control end of the first control switch 301 is connected to the output end 2033 of the comparison circuit. When the comparison circuit 203 outputs a gas leakage detection signal, the working circuit of the first indication unit 302 is closed. In this embodiment, the first control switch 301 can be a transistor switch, such as a triode, a MOS tube, an IGBT, etc., and can also be a relay, which is not limited in this embodiment. In this embodiment, the first indication unit 302 can include a separately installed sound output device, such as a voice alarm, a buzzer, etc., and can also include a separately installed display device, such as an LED lamp or an LED array, or a display screen. In this embodiment, the first indication unit 302 can also be a display instrument panel on a vehicle.

[0058] As an exemplary embodiment, the air leakage detection signal output by the comparator may also be transmitted to the vehicle controller via the vehicle control bus, and the vehicle controller may control the vehicle instrument panel or the vehicle alarm device to output an air leakage indication signal according to the air leakage detection signal.

[0059] As an exemplary embodiment, after a leak occurs in the sealed cavity, in order to ensure normal use, or to ensure normal use from the time the leak occurs to the time the airtight components are replaced or the power exchange connector 10 is repaired, in this embodiment, the sealed cavity can be automatically inflated after the leak occurs.

[0060] For details, see Figure 4 As shown, the inflatable device 202 is connected to the output end of the comparison circuit 203, and the inflatable device 202 can be started to inflate the sealed cavity under the triggering of the leakage detection signal. Specifically, the inflatable device 202 includes an inflatable circuit, and the inflatable circuit is connected in series with a third control switch 2032 and an inflatable element 2021. The control end of the third control switch 2032 is connected to the output end of the comparator, and is closed under the triggering of the leakage detection signal output by the comparator, and the inflatable element 2021 is electrically started.

[0061] As an exemplary embodiment, the third control switch 2032 is connected in series in the inflation circuit. When the third control switch 2032 is turned on, it can connect the connection between the inflation element 2021 and the power supply. The third control switch 2032 can use a transistor switch, such as a triode, MOS tube or IGBT, or a relay. In this embodiment, the third control switch 2032 can adopt an NPN transistor switch. When the pressure in the sealed cavity is relatively high, the voltage of the comparison end 2031 of the comparison circuit 203 is higher than that of the reference end 2032, and the output is a high level. At this time, the third control switch 2032 is in an off state; when the pressure in the sealed cavity decreases, the voltage output by the comparison end 2031 of the comparison circuit 203 is less than the reference voltage Vref of the reference end 2032, and the comparison circuit 203 outputs a low level. At this time, the third control switch 2032 is turned on, and the inflation element 2021 is powered on to start and inflate the sealed cavity. After the inflation pressure reaches the preset pressure, the comparison circuit 203 outputs a high level, the third control switch 2032 is disconnected, and the inflation element 2021 stops inflating.

[0062] In actual applications, the sealed cavity of the power exchange connector 10 may not be absolutely sealed, and the air pressure is in a slow leakage state. If a slow leakage occurs, the sealing state can be considered normal. If a faster leakage occurs, the sealing can be considered abnormal. Therefore, it is necessary to detect the leakage rate of the sealed cavity to prevent the comparison circuit 203 from outputting a false detection signal when there is a slow leak. Therefore, within the preset time period after the inflation is completed, if the comparison circuit 203 outputs a leakage detection signal, it indicates that the leakage rate is fast and the air tightness of the sealed cavity is abnormal. After the inflation is completed, if the comparison circuit 203 outputs a leakage detection signal after exceeding the preset time period, it indicates that the leakage rate is slow, the air tightness of the sealed cavity is normal, and the leakage detection signal can be ignored.

[0063] Therefore, in order to prevent the comparison circuit 203 from outputting a false detection signal, as an exemplary embodiment, the detection circuit 20 further includes: a clock control circuit 204. The clock control circuit 204 determines whether the current leakage rate is a normal leakage rate. Specifically, the input preset clock signal of the clock control circuit 204 is used as a preset time period. Within the preset time period, that is, during the period when the preset clock signal is in a valid state, the clock control circuit 204 can be triggered by the leakage detection signal output by the comparison circuit 203 to indicate that the current sealing state is abnormal; if it exceeds the preset time period, that is, the preset clock signal is in an invalid state (that is, after the timing is completed), the clock control circuit 204 cannot be triggered by the leakage detection signal output by the comparison circuit 203, and does not output an abnormal indication signal.

[0064] As a specific example, see Figure 5As shown, the clock control circuit 204 includes a level trigger terminal 2041 and a clock signal input terminal 2042, wherein the level trigger terminal 2041 is connected to the output terminal of the comparison circuit 203, and the clock signal input terminal 2042 inputs a preset clock signal; when the preset clock signal is in a first state, the level trigger terminal 2041 is disabled; when the preset clock signal is in a second state, the level trigger terminal 2041 is enabled.

[0065] As an exemplary embodiment, the detection circuit 20 may further include a second indication device 40, which is connected to the output end of the clock control circuit 204 and can output a second indication signal of air leakage in the sealed cavity when triggered by a clock control trigger signal output by the clock control circuit 204.

[0066] As an exemplary embodiment, the preset clock signal may be in an invalid state during the first state, that is, the preset clock signal completes timing, the level trigger terminal 2041 is disabled, and no matter what signal the comparator outputs, the clock control circuit 204 cannot be triggered;

[0067] During the second state of the preset clock signal, the preset clock signal is in a valid state, that is, within a preset time period, the level trigger terminal 2041 is enabled, and when the comparison circuit 203 outputs a gas leakage detection signal, the clock control circuit 204 can be triggered to output a clock control trigger signal. Therefore, after the preset clock signal is switched to the second state, the level trigger terminal 2041 outputs the clock control trigger signal under the triggering of the gas leakage detection signal output by the comparison circuit 203, so as to trigger the second indication device 40 to output the second indication signal to indicate the current airtightness abnormality.

[0068] In this embodiment, the second indicating device 40 may be the same indicating device as the first indicating device 30 , or may be a different indicating device, which is not limited in this embodiment.

[0069] As an exemplary embodiment, the second indication device 40 is similar to the first indication device 30, and may include a second control switch 401 and a second indication unit 402. The control end of the second control switch is connected to the output of the clock control circuit 204. Under the triggering of the clock control trigger signal, the second control switch 401 controls the second indication unit 402 to output the second indication signal. For a specific description, please refer to the description of the first indication device 30, which will not be repeated here.

[0070] As an optional embodiment, the clock control circuit 204 may use a clock-controlled level trigger, for example, a clock-controlled RS trigger, a clock-controlled D trigger, or a clock-controlled JK trigger. In this embodiment, the clock-controlled D trigger may be used as an example for description:

[0071] See also Figure 6 As shown, the CP terminal is the clock signal input terminal 2042, the D terminal is the level trigger terminal 2041, and the Q terminal is the output terminal of the clock control circuit 204. When CP=0, the D terminal is disabled, the Q terminal is maintained, or there is no output; when CP=1, the D terminal inputs a low level "0" signal, and the Q terminal outputs a low level "0" signal. When a high level "1" is input to the D terminal, the Q terminal outputs a high level "1".

[0072] In this embodiment, when the preset clock signal is in a valid state, that is, in the second state, and the D terminal is in an enabled state:

[0073] When the air pressure in the sealed cavity is high, for example, the comparison circuit 203 outputs a high level, indicating that the current airtightness state is normal, the clock-controlled D trigger outputs a high level, and the second indication device 40 is not triggered. Exemplarily, the second control switch 401 in the second indication device 40 can be a low-level triggered control switch, for example, an NPN transistor switch can be used.

[0074] The air pressure in the sealed cavity decreases rapidly while the preset clock signal is in an effective state, and the comparison circuit 203 outputs a leakage detection signal. For example, the comparison circuit 203 outputs a low level, the clock-controlled D flip-flop outputs a low level, and the second indication device 40 is triggered to output a second indication signal to indicate that it is currently in a leakage state.

[0075] When the preset clock signal is in an invalid state, that is, in the first state, the D terminal is in a disabled state, no matter how high or low the air pressure in the sealed cavity is, the comparison circuit 203 outputs a signal of any level, and the clock-controlled D flip-flop will not be triggered. Therefore, after exceeding the preset time period (after the preset clock signal completes the countdown), the signal output by the comparison circuit 203 can be shielded, indicating that if no air leakage occurs within the preset time, the airtightness state is normal, preventing the comparison circuit 203 from outputting a false detection signal.

[0076] As an exemplary embodiment, the inflating device 202 is connected to the output end of the comparison circuit 203, and the inflating device 202 can be started to inflate the sealed cavity under the triggering of the leakage detection signal. In order to accurately detect the leakage when it occurs in the preset time period, in this embodiment, if the leakage occurs within the preset time period, that is, when the comparison circuit 203 outputs the leakage detection signal, the inflating is not performed. After exceeding the preset time period, if the leakage occurs, the inflating is performed again. Not only can the leakage be detected accurately and timely, but also the positive pressure in the sealed cavity can be maintained at all times when the air pressure drops and the alarm cannot be sounded after exceeding the preset time period.

[0077] In this embodiment, if the air pressure in the sealed cavity decreases after a preset time period, causing the comparison circuit 203 to output a leakage detection signal (eg, a low level), the leakage detection signal can trigger the inflation device 202 to automatically inflate.

[0078] When the preset clock signal is in the first state, the preset clock signal maintains the triggering effect of the leakage detection signal on the inflatable device 202; when the preset clock signal is in the second state, the preset clock signal shields the triggering effect of the leakage detection signal on the inflatable device 202.

[0079] like Figure 7 As shown, a fourth control switch 2043 is further provided between the output end of the comparison circuit 203 and the inflatable device 202, and the control end of the fourth control switch 2043 is connected to the clock signal input end 2042. When the preset clock signal is in the first state, the fourth control switch 2043 is triggered to close, and when the preset clock signal is in the second state, the fourth control switch 2043 is triggered to open. In this embodiment, the period when the preset clock signal is in the first state is the period when the preset clock signal is in an invalid state, that is, it exceeds the preset time period; the period when the preset clock signal is in the second state is the period when the preset clock signal is in a valid state, that is, it is within the preset time period.

[0080] Exemplarily, the fourth control switch 2043 can be connected between the comparison circuit output terminal 2033 and the control terminal of the third control switch 2032 in the inflation circuit. In this embodiment, the fourth control switch 2043 can adopt a transistor switch, such as a triode, a MOS tube or an IGBT, or a relay. In this embodiment, the third control switch 2032 can be an NPN transistor switch. When the preset clock signal is in a valid state, that is, the preset clock signal is in the second state, when the preset always signal is at a high level, the fourth control switch 2043 is disconnected, and the signal output by the comparison circuit output terminal 2033 cannot control the third control switch 2032; when the preset always signal is in an invalid state, that is, the preset clock signal is in the first state, the fourth control switch 2043 is turned on. When the pressure in the sealed cavity decreases, the voltage output by the comparison terminal 2031 of the comparison circuit 203 is less than the reference voltage Vref of the reference terminal 2032, and the comparison circuit 203 outputs a low level. At this time, the third control switch 2032 is turned on, and the inflatable element 2021 is powered on to start, thereby inflating the sealed cavity. After the inflation pressure reaches the preset pressure, the comparison circuit 203 outputs a high level, the third control switch 2032 is disconnected, and the inflatable element 2021 stops inflating.

[0081] Thus, within the preset time period, the preset clock signal shields the triggering effect of the leakage detection signal outputted by the comparison circuit output terminal 2033 on the inflatable device 202; after exceeding the preset time period, the preset clock signal maintains the triggering effect of the leakage detection signal on the inflatable device 202. It is ensured that when the alarm time is not exceeded, after the cavity leaks, the inflatable device 202 will not be inflated but an accurate alarm will be given, and when the alarm time is exceeded, the sealed cavity will be automatically inflated after the pressure is too low.

[0082] As an optional embodiment, the generation of the preset clock signal can be triggered manually or automatically. Optionally, taking automatic triggering as an example, after the inflation device 202 completes inflation, the clock signal generating end can be automatically triggered to output the preset clock signal. In this embodiment, the clock signal generating end can be a countdown circuit based on a timer, and a timer chip can also be used as the clock signal generating end.

[0083] As an optional embodiment, the inflatable device 202 may include an inflatable circuit and an inflatable element 2021 connected to the inflatable circuit. When the inflatable circuit is turned on, the inflatable element 2021 is powered and starts to inflate. When the inflatable circuit is turned off, the inflatable circuit is turned off. At the moment when the inflatable circuit is turned off, the inflatable circuit changes from the on state to the off state, and a trigger edge with a falling edge may be output. Under the triggering of the trigger edge, the clock signal generating end outputs a preset clock signal, and the preset clock signal may be set according to a preset time period, for example, it may be set to a preset duration of one day, one week, one month, etc. The preset clock signal is in a valid state within the preset time period, that is, it is kept in the second state, thereby enabling the level trigger end 2041 to be in an enabled state.

[0084] As an optional embodiment, the detection circuit 20 also includes: a timing circuit, wherein a timing trigger end of the timing circuit is connected to an output end of the comparison circuit 203, and timing starts when triggered by a sealing detection signal output by the comparison circuit 203, and timing stops when triggered by a leakage detection signal output by the comparison circuit 203; when the sealing detection signal is a signal output by the air pressure detection element 201 triggering the comparison circuit 203 when the air pressure in the sealed cavity is greater than a preset air pressure; when the leakage detection signal is a signal output by the air pressure detection element 201 triggering the comparison circuit 203 when the air pressure in the sealed cavity is less than a preset air pressure.

[0085] The detection circuit 20 further includes a third indicating device, the input end of which is connected to the output end of the timing circuit, and is used to receive a start timing signal and an end timing signal output by the timing circuit.

[0086] The third indication device includes a fifth control switch and a third indication unit. The output end of the timing circuit is connected to the control end of the fifth control switch. The fifth control switch disconnects the connection loop between the third indication unit and the power supply when triggered by the start timing signal, and connects the connection loop between the third indication unit and the power supply when triggered by the end timing signal. The third indication unit outputs a third indication signal.

[0087] As an exemplary embodiment, in this embodiment, the time length from the completion of each inflation to the output of the air leakage detection signal can be measured by the timing circuit, and the corresponding timing information can be output by the third indicator device. In this embodiment, the third indicator device and the first indicator device 30 and the second indicator device 40 can be the same indicator device or different indicator devices. For details, please refer to the description of the first indicator device 30.

[0088] As an optional embodiment, the timing circuit can also communicate with the controller through the vehicle bus, and the start timing signal and the end timing signal are sent to the vehicle controller. The vehicle controller can count the time from the completion of each inflation of each electrical connector to the output of the leakage detection signal by the comparison circuit 203, and then obtain the airtightness change characteristics of multiple electrical connectors. Then, the airtightness life of the electrical connector is predicted based on the airtightness change characteristics. In this embodiment, the airtightness components of the electrical connector can be repaired or replaced in advance based on the predicted airtightness life to prevent water ingress, short circuit, etc. caused by sudden leakage during use, thereby achieving preventive safety protection.

[0089] As an optional embodiment, after counting the change characteristics of each electrical connector respectively, a comprehensive analysis can be performed based on the change characteristics and the structure and installation process of the corresponding electrical connector to obtain the key factors for maintaining good airtightness, thereby providing effective theoretical support for improving the airtightness of the electrical connector.

[0090] As an exemplary embodiment, the comparison circuit 203 includes multiple comparators, and the comparison ends 2031 of the multiple comparators are all connected to the output end of the air pressure detection element 201, wherein different comparators have different reference voltages Vref, and different comparator outputs represent airtightness detection signals of different air pressures in the sealed cavity.

[0091] Optionally, hierarchical pressure detection inside the sealed cavity can be achieved through multiple comparators. In the present embodiment, taking the air pressure detection element 201 as a linear air pressure sensor as an example, a linear voltage of 0-5V can be output as the pressure changes. In the present embodiment, the time intervals at which multiple comparators output leakage detection signals can be counted to calculate the leakage rate of the sealed cavity in real time. When the leakage rate is greater than a preset rate, a prompt signal can be output before complete leakage to provide an early warning.

[0092] As an exemplary embodiment, the output ends of multiple comparators can be connected to the timing circuit respectively, and the timing starts after the inflation is completed. When the comparator outputs the leakage detection signal, the timing circuit outputs the corresponding end timing signal, or outputs the corresponding timing duration, and then the leakage duration of different pressure levels can be classified and counted to perform real-time calculation of the leakage rate.

[0093] As an exemplary embodiment, the inflatable element 2021 includes an air inlet, an air outlet and an air pump, the air pump is connected to the air inlet, and the air outlet is connected to the sealed cavity.

[0094] In this embodiment, when the inflatable element 2021 is inflated, the air pump pumps air to the air inlet through the air pipe, and then reaches the sealed cavity through the air outlet, so that the inflatable element 2021 inflates the sealed cavity.

[0095] As an exemplary embodiment, the air inlet is connected to the sealed cavity by welding, plugging or threading, and a sealing gasket is provided between the air inlet and the sealed cavity.

[0096] In this embodiment, the air inlet and the sealed cavity can be connected by welding, plugging or threading, and a sealing gasket is arranged between the air inlet and the sealed cavity, which can effectively improve the airtightness of the power exchange connector 10.

[0097] As an exemplary embodiment, the detection end of the air pressure detection element 201 is inserted into the sealed cavity, the output end is arranged outside the sealed cavity, and a sealing gasket is arranged between the air pressure detection element 201 and the sealed cavity.

[0098] In this embodiment, the detection end of the air pressure detection element 201 is inserted into the sealed air cavity to detect the air pressure in the sealed cavity. The output end is arranged outside the sealed cavity to realize the connection with the comparator of the detection circuit 20. A sealing gasket is also arranged between the air pressure detection element 201 and the sealed cavity to improve the airtightness of the power exchange connector 10 and prevent air leakage between the connection gaps.

[0099] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0100] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An airtightness detection device, suitable for the battery replacement connector, the battery replacement connector includes a vehicle-end electrical connection device and a battery-end electrical connection device, the vehicle-end electrical connection device and the battery-end electrical connection device can form a sealed cavity when coupled in place, characterized in that: The airtightness detection device comprises an air pressure detection element and an air filling device communicated with the sealed cavity, and a detection circuit electrically connected to the air pressure detection element, wherein the air pressure detection element is used to detect the air pressure in the sealed cavity, and the air filling device is used to fill the sealed cavity with air; The detection circuit includes a comparison circuit, a comparison end of which is connected to the output end of the air pressure detection element, and is used to compare the output voltage of the air pressure detection element with a reference voltage, and can output a leakage detection signal for indicating that leakage has occurred in the sealed cavity.

2. The airtightness detection device according to claim 1, characterized in that: The detection circuit further includes: a first indication device connected to the output end of the comparison circuit, and configured to output a first indication signal indicating that the sealed cavity is leaking when triggered by the leakage detection signal; preferably, The first indication device includes an electrically connected first control switch and a first indication unit, wherein the control end of the first control switch is connected to the output end of the comparison circuit, and when triggered by the leakage detection signal, the first control switch controls the first indication unit to output the first indication signal.

3. The airtightness detection device according to claim 1, characterized in that: The detection circuit also includes: A clock control circuit, the clock control circuit comprising a level trigger terminal and a clock signal input terminal, wherein the level trigger terminal is connected to the output terminal of the comparison circuit, and the clock signal input terminal inputs a preset clock signal; During the first state of the preset clock signal, the level trigger terminal is disabled; During the second state of the preset clock signal, the level trigger terminal is enabled.

4. The airtightness detection device according to claim 3, characterized in that: The detection circuit also includes a second indication device, which is connected to the output end of the clock control circuit and can output a second indication signal of leakage of the sealed cavity under the triggering of the clock control trigger signal output by the clock control circuit; preferably, After the preset clock signal switches to the second state, the level trigger terminal outputs the clock control trigger signal under the triggering of the leakage detection signal output by the comparison circuit to trigger the second indication device to output the second indication signal.

5. The airtightness detection device according to claim 4, characterized in that: The second indication device includes an electrically connected second control switch and a second indication unit, wherein the control end of the second control switch is connected to the output of the clock control circuit, and when triggered by the clock control trigger signal, the second control switch controls the second indication unit to output the second indication signal.

6. The airtightness detection device according to claim 4, characterized in that: The inflating device is connected to the output end of the comparison circuit, and the inflating device can be started to inflate the sealed cavity under the triggering of the leakage detection signal; preferably, The inflation device comprises an inflation circuit; the inflation circuit is connected in series with a third control switch and an inflation element, the control end of the third control switch is connected to the output end of the comparator, and is closed under the triggering of the leakage detection signal output by the comparator, and the inflation element is electrically started; preferably, The inflation circuit is also connected to the clock signal generating end of the clock control circuit. When triggered by the trigger edge when the inflation circuit is switched from an on state to an off state, the clock signal generating end enables the clock signal input end of the clock control circuit to set the preset clock signal to the second state.

7. The airtightness detection device according to claim 6, characterized in that: The clock signal input terminal is connected between the inflation device and the output terminal of the comparison circuit; During the first state of the preset clock signal, the preset clock signal maintains the triggering effect of the air leakage detection signal on the inflator; During the second state, the preset clock signal shields the triggering effect of the air leakage detection signal on the inflatable device; preferably, A fourth control switch is also arranged between the output end of the comparison circuit and the inflation device. The control end of the fourth control switch is connected to the clock signal input end. When the preset clock signal is in the first state, the fourth control switch is triggered to close. When the preset clock signal is in the second state, the fourth control switch is triggered to open.

8. The airtightness detection device according to any one of claims 1 to 7, characterized in that: The comparison circuit includes a plurality of comparators, and the comparison ends of the plurality of comparators are all connected to the output end of the air pressure detection element, wherein different comparators have different reference voltages, and different comparator outputs represent airtightness detection signals of different air pressures in the sealed cavity.

9. A power replacement connector, characterized in that: It includes a vehicle-end electrical connection device and a battery-end electrical connection device, and the vehicle-end electrical connection device and the battery-end electrical connection device can form a sealed cavity when they are coupled in place; The battery replacement connector is also provided with an airtightness detection device as described in any one of claims 1-8.

10. A vehicle, characterized in that: Including the power replacement connector described in claim 9.

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