CN110386007B - Electric automobile and electric bicycle charge-discharge spontaneous combustion protection device and method for processing digital signals by spontaneous combustion protection device - Google Patents

Abstract

The invention discloses an electric automobile and an electric bicycle charge-discharge spontaneous combustion protection device, wherein a spark extraction circuit transmits a spark signal generated in a battery charging process to a spark signal processing circuit, the spark signal processing circuit carries out analog-to-digital conversion on the spark signal and transmits a converted digital signal to a central processing unit, a temperature processing circuit carries out analog-to-digital conversion on a temperature signal of an environment where a battery is located and transmits the converted digital signal to the central processing unit, and the central processing unit receives and processes the digital signal and transmits the digital signal to an output circuit. The invention monitors the environment of the rechargeable battery and simultaneously monitors the spark signal generated in the battery charging process, and can monitor the battery in real time and give corresponding alarm or directly terminate the battery charging in the battery charging process, thereby prolonging the service life of the battery.

Description

Electric automobile and electric bicycle charge-discharge spontaneous combustion protection device and method for processing digital signals by spontaneous combustion protection device

Technical Field

The invention relates to the technical field of electric automobile power supply equipment, in particular to an electric automobile and an electric bicycle charge-discharge spontaneous combustion protection device and a method for processing digital signals by the spontaneous combustion protection device.

Background

Electric vehicles and electric bicycles have the same power source, namely a rechargeable power source, and because of the same power source, the same unsafe factors are brought to the electric vehicles and the electric bicycles.

These unsafe factors are all kept away from the critical component of the battery. Electric vehicles and electric bicycles are all charged by an energy storage battery to obtain energy, and many fires occur because of various poor contact, internal ignition of the battery and the like in the charge and discharge processes. In these cases, a plurality of sparks having a large current occur, and these sparks may cause locally generated heat energy to reach ignition energy of the electric vehicle plastic part, thereby causing spontaneous combustion of the electric vehicle plastic part and thus becoming a fire. This mechanism has been defined by the national fire department several times.

Disclosure of Invention

The invention aims to: aiming at the unsafe conditions of poor contact, internal ignition of a battery and the like in the charging process of an electric automobile and an electric bicycle, the invention provides an electric automobile and an electric bicycle charging and discharging spontaneous combustion protection device and a method for processing digital signals by the spontaneous combustion protection device.

The technical scheme is as follows: in order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:

the utility model provides an electric automobile and electric bicycle charge-discharge spontaneous combustion protection device, protection device is including spark extraction circuit, spark signal processing circuit, central processing unit, temperature processing circuit and output circuit, spark extraction circuit is with the spark signal transmission that produces among electric automobile and the electric bicycle battery charging process to spark signal processing circuit, spark signal processing circuit carries out analog-to-digital conversion with the spark signal to in the central processing unit with the digital signal after the conversion, temperature processing circuit carries out analog-to-digital conversion with the temperature signal that electric automobile and electric bicycle battery were located environment detected, and in the digital signal after the conversion is transmitted to central processing unit, central processing unit receives the digital signal that spark signal processing circuit transmitted and temperature processing circuit transmitted, and in the output circuit after handling the digital signal.

Further, the spark extraction circuit includes a switch S1, a wideband current transformer CT, a first resistor R1, a first capacitor C1 and a first diode D1, two ends of a primary coil of the wideband current transformer CT are electrically connected to charging circuits of the electric automobile and the electric bicycle battery, one end of a secondary coil of the wideband current transformer CT is electrically connected to an input end of the first resistor R1, an input end of the first capacitor C1 and an anode of the first diode D1, the other end of the secondary coil of the wideband current transformer CT is electrically connected to an output end of the first resistor R1 and an output end of the first capacitor C1, the other end of the secondary coil of the wideband current transformer CT, the output end of the first resistor R1 and the output end of the first capacitor C1 are grounded, and a cathode of the first diode D1 is electrically connected to an input end of the spark signal processing circuit.

Further, the spark signal processing circuit comprises a broadband converter and an analog-to-digital conversion circuit, wherein the broadband converter receives the spark signal transmitted by the spark extraction circuit, converts the spark signal into an anti-interference detection unidirectional voltage form, simultaneously transmits the spark signal in the anti-interference detection unidirectional voltage form to the analog-to-digital conversion circuit for analog-to-digital conversion, and the analog-to-digital conversion circuit transmits the converted digital signal to the central processing unit.

Further, the temperature processing circuit comprises a temperature sensor and an analog-to-digital conversion circuit, wherein the temperature sensor senses the external environment temperature of the batteries of the electric automobile and the electric bicycle, transmits the temperature signal to the analog-to-digital conversion circuit for analog-to-digital conversion, and transmits the converted digital signal to the central processing unit.

Further, the central processing unit is one of various digital signal processing chips and is used for judging whether the batteries of the electric automobile and the electric bicycle have spontaneous combustion in the charging process.

Further, the output circuit comprises a warning repair module, an audible and visual alarm module and a cut-off charge-discharge module, wherein the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module are electrically connected with the output end of the central processing unit through different ports, and a parallel time sequence relationship exists among the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module.

Further, the warning repair module includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second diode D2, a third diode D3, and a first triode Q1, where an input end of the second resistor R2 is electrically connected to an output end of the central processing unit, an output end of the second resistor R2 is electrically connected to a base of the first triode Q1, a collector of the first triode Q1 is electrically connected to an input end of the third resistor R3 and an input end of the fourth resistor R4, an output end of the third resistor R3 and an output end of the fourth resistor R4 are electrically connected to an anode of the second diode D2, an audible-visual alarm module, and a cut-off charge and discharge module, a cathode of the second diode D2 is electrically connected to an anode of the third diode D3, a cathode of the third diode D3 is electrically connected to an input end of the fifth resistor R5, and an emitter of the first triode Q1 and an output end of the fifth resistor R5 are grounded.

Further, the audible and visual alarm module includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth diode D4, a fifth diode D5, a second triode Q2 and a speaker LS, wherein an input end of the sixth resistor R6 is electrically connected to an output end of the central processing unit, an output end of the sixth resistor R6 is electrically connected to a base of the second triode Q2, a collector of the second triode Q2 is electrically connected to an input end of the seventh resistor R7 and an input end of the eighth resistor R8, an output end of the seventh resistor R7 and an output end of the eighth resistor R8 are electrically connected to an anode of the fourth diode D4, a warning repair module and a cut-off charge/discharge module, a cathode of the fourth diode D4 is electrically connected to an anode of the fifth diode D5 and an input end of the speaker LS, an output end of the speaker LS is electrically connected to an output end of the ninth resistor R9, and an output end of the ninth resistor R9 is electrically connected to an output end of the ninth resistor R9, and an emitter of the ninth resistor R2 is grounded.

Further, the cut-off charging and discharging module comprises a tenth resistor R10, an eleventh resistor R11, a third triode Q3 and a solid-state relay J, wherein the input end of the tenth resistor R10 is electrically connected with the output end of the central processing unit, the output end of the tenth resistor R10 is electrically connected with the base electrode of the third triode Q3, the collector electrode of the third triode Q3 is electrically connected with the input end of the eleventh resistor R11 and the input end of the solid-state relay J, the output end of the eleventh resistor R11 is electrically connected with the input end of the solid-state relay J, the warning repair module and the acousto-optic warning module, and the output end of the solid-state relay J and the emitter electrode of the third triode Q3 are grounded.

A method of processing a digital signal by an autoignition protection device, the method comprising:

step S1: the method comprises the steps that a counter in the central processing unit counts the number of times of transmitting digital signals by a spark signal processing circuit in preset time, and the number of times of transmitting digital signals by the spark signal processing circuit in preset time is obtained according to the numbers recorded in the counter in the preset time;

step S2: setting a warning repair value, a warning value and an interrupt value in the central processing unit, wherein the sizes of the warning repair value, the warning value and the interrupt value are sequentially increased;

step S3: judging the relation between the number of times and the warning repair value and the warning value according to the number of times of the spark signal processing circuit transmitting the digital signal in the preset time, wherein the relation is specifically as follows:

when the number of times is smaller than a warning repair value, the warning repair module, the audible and visual alarm module and the cut-off charging and discharging module are not started;

when the number of times is not less than the warning repair value and less than the warning value, the warning repair module is started according to a signal sent by the central processing unit, and the audible and visual alarm module and the cut-off charging and discharging module are not started;

when the number of times is not smaller than the warning value, executing the next step;

step S4: judging the relation between the value corresponding to the digital signal transmitted by the temperature processing circuit and the warning value and the interrupt value according to the value corresponding to the digital signal transmitted by the temperature processing circuit, wherein the relation is specifically as follows:

when the value corresponding to the digital signal transmitted by the temperature processing circuit is not less than the warning value and less than the interrupt value, the audible and visual alarm module is started according to the signal sent by the central processing unit, and the warning repair module and the cut-off charging and discharging module are not started;

when the value corresponding to the digital signal transmitted by the temperature processing circuit is not smaller than the interrupt value, the cut-off charging and discharging module is started according to the signal sent by the central processing unit, and the warning repair module and the audible and visual alarm module are not started.

The beneficial effects are that: compared with the prior art, the technical scheme of the invention has the following beneficial technical effects:

the protection device comprises a spark extraction circuit, a spark signal processing circuit, a central processing unit, a temperature processing circuit and an output circuit, not only monitors the external environment where the rechargeable battery is located, but also monitors spark signals generated in the battery charging process, and the central processing unit can monitor the battery in real time and make corresponding alarm behaviors or directly terminate the battery charging in the battery charging process through real-time processing of the digital signals, so that the phenomenon of spontaneous combustion of the battery in charge and discharge with the battery as an energy source is reduced, and the service life of the battery is prolonged.

Drawings

FIG. 1 is a schematic flow diagram of a protection device of the present invention;

FIG. 2 is a schematic circuit diagram of a spark extraction circuit of the present invention;

FIG. 3 is a graph of current waveforms corresponding to a spark extraction circuit of the present invention when the battery is normally charged and discharged;

FIG. 4 is a graph of current waveforms corresponding to the spark extraction circuit of the present invention when generating a spark signal during battery charging and discharging;

FIG. 5 is a schematic flow diagram of a spark signal processing circuit of the present invention;

FIG. 6 is a schematic flow diagram of a temperature processing circuit of the present invention;

FIG. 7 is a schematic diagram of a central processing unit receiving and transmitting signals according to the present invention;

FIG. 8 is a circuit schematic of the output circuit of the present invention;

fig. 9 is a schematic flow chart of the digital signal processing by the cpu according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Wherein the described embodiments are some, but not all embodiments of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Example 1

Referring to fig. 1, the embodiment provides a charge-discharge spontaneous combustion protection device for an electric automobile and an electric bicycle, which comprises a spark extraction circuit, a spark signal processing circuit, a central processing unit, a temperature processing circuit and an output circuit. The spark extraction circuit is used for collecting spark signals generated in the charging process of batteries of the electric automobile and the electric bicycle and transmitting the collected spark signals to the spark signal processing circuit. And after receiving the spark signal transmitted by the spark extraction circuit, the spark signal processing circuit performs analog-to-digital conversion on the spark signal, and transmits the digital signal obtained by conversion to the central processing unit. Meanwhile, the temperature processing circuit acquires temperature signals detected by the environments of batteries of the electric automobile and the electric bicycle, carries out analog-to-digital conversion on the temperature signals, and transmits digital signals obtained by the analog-to-digital conversion to the central processing unit. The central processing unit receives the digital signals transmitted by the spark signal processing circuit and the digital signals transmitted by the temperature processing circuit, processes the two received digital signals and transmits the processed digital signals to the output circuit. Specifically, the central processor may be any one of various digital processing chips, and in this embodiment, the central processor is selected to be an FPGA chip, i.e. the FPGA chip is used to determine whether the battery of the electric automobile and the electric bicycle will have spontaneous combustion in the charging process.

Referring to fig. 2, the spark extraction circuit in the present embodiment includes a switch S1, a wideband current transformer CT, a first resistor R1, a first capacitor C1 and a first diode D1, wherein both ends of a primary coil of the wideband current transformer CT are electrically connected to charging circuits of batteries of electric vehicles and electric bicycles, one end of a secondary coil of the wideband current transformer CT is electrically connected to an input end of the first resistor R1, an input end of the first capacitor C1 and an anode of the first diode D1, and the other end of the secondary coil of the wideband current transformer CT is electrically connected to an output end of the first resistor R1 and an output end of the first capacitor C1, while the other ends of the secondary coil of the wideband current transformer CT are grounded, that is, both the output end of the first resistor R1 and the output end of the first capacitor C1 are grounded. The cathode of the first diode D1 is electrically connected to the input terminal of the spark signal processing circuit.

Referring to fig. 3, when the electric vehicle and the electric bicycle battery do not generate the spark signal during the charging process, the current flowing through the wideband current transformer CT once is a smooth direct current.

Referring to fig. 4, when the electric vehicle and the electric bicycle battery generate a spark signal during charging, the current flowing through the wideband current transformer CT once is a wideband randomly varying current. In this embodiment, the spark extraction circuit is to extract this randomly varying current and transmit it to the FPGA chip through the spark signal processing circuit. Specifically, when the current flowing through the primary coil of the wideband current transformer CT is a direct current, the current induced by the secondary coil of the wideband current transformer CT will be zero. When the current flowing through the primary coil of the wideband current transformer CT is a randomly varying current, the secondary coil of the wideband current transformer CT will induce a current with the same varying rate and the same frequency. The random current can be extracted by the broadband current transformer CT and subjected to anti-interference detection to form a unidirectional, variable and broadband spark current map which can represent the current value frequency of the spark signal and the time for maintaining the spark signal.

Referring to fig. 5, the spark signal processing circuit in this embodiment includes a wideband current transformer and an analog-to-digital conversion circuit. The broadband current transformer receives and processes the spark signal transmitted by the spark extraction circuit, specifically, the broadband current transformer converts the transmitted spark signal into an anti-interference detection unidirectional voltage form, and transmits the spark signal in the anti-interference detection unidirectional voltage form to the analog-to-digital conversion circuit for analog-to-digital conversion, and then the analog-to-digital conversion circuit transmits the converted digital signal to the central processor.

Referring to fig. 6, the temperature processing circuit in the present embodiment includes a temperature sensor and an analog-to-digital conversion circuit. The temperature sensor is used for sensing the external environment temperature of the batteries of the electric automobile and the electric bicycle, transmitting the detected temperature signals to the analog-to-digital conversion circuit for analog-to-digital conversion, and transmitting the converted digital signals to the central processing unit by the analog-to-digital conversion circuit.

Referring to fig. 7, the central processing unit in the present embodiment receives the spark signal data and the ambient temperature signal data, processes the spark signal data and the ambient temperature signal data, and transmits them to the output circuit according to the actual situation. The output circuit comprises a warning repair module, an audible and visual alarm module and a cut-off charge-discharge module, wherein the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module are electrically connected with the central processing unit through different ports, and a parallel time sequence relationship exists among the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module. That is, the central processor transmits the spark signal data and the ambient temperature signal data to the warning repair module, the audible and visual alarm module, and the cut-off charge and discharge module according to actual conditions.

Referring to fig. 8, the warning repair module in the present embodiment includes a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second diode D2, a third diode D3, and a first transistor Q1. The output end of the central processing unit is electrically connected with the input end of the second resistor R2, and the output end of the second resistor R2 is electrically connected with the base electrode of the first triode Q1. And the collector of the first triode Q1 is electrically connected with the input end of the third resistor R3 and the input end of the fourth resistor R4, and the emitter of the first triode Q1 is grounded.

Meanwhile, the output end of the third resistor R3 and the output end of the fourth resistor R4 are electrically connected with the anode of the second diode D2, the acousto-optic alarm module and the cut-off charge-discharge module, the cathode of the second diode D2 is electrically connected with the anode of the third diode D3, the cathode of the third diode D3 is electrically connected with the input end of the fifth resistor R5, and the output end of the fifth resistor R5 is directly grounded.

The audible and visual alarm module in this embodiment includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth diode D4, a fifth diode D5, a second triode Q2, and a speaker LS. The output end of the central processing unit is electrically connected with the input end of the sixth resistor R6, and the output end of the sixth resistor R6 is electrically connected with the base electrode of the second triode Q2. The collector of the second triode Q2 is electrically connected with the input end of the seventh resistor R7, the input end of the eighth resistor R8 and the emitter of the eighth resistor R8 and is directly grounded.

The output end of the seventh resistor R7 and the output end of the eighth resistor R8 are electrically connected with the anode of the fourth diode D4, the warning repair module and the cut-off charging and discharging module, the cathode of the fourth diode D4 is electrically connected with the anode of the fifth diode D5 and the input end of the loudspeaker LS, the cathode of the fifth diode D5 is electrically connected with the input end of the ninth resistor R9, meanwhile, the output end of the ninth resistor R9 is electrically connected with the output end of the loudspeaker LS, and the output end of the ninth resistor R9 and the output end of the loudspeaker LS are grounded.

The charge-discharge cutting module in this embodiment includes a tenth resistor R10, an eleventh resistor R11, a third triode Q3, and a solid state relay J. The output end of the central processing unit is electrically connected with the input end of the tenth resistor R10, and the output end of the tenth resistor R10 is electrically connected with the base electrode of the third triode Q3. The collector of the third triode Q3 is electrically connected with the input end of the eleventh resistor R11, the input end of the solid-state relay J and the emitter of the solid-state relay J to be directly grounded.

Meanwhile, the output end of the eleventh resistor R11 is electrically connected with the input end of the solid-state relay J, the warning repair module and the audible and visual alarm module, and the output end of the solid-state relay J is directly grounded.

The existing electric automobile and electric bicycle mainly comprise plastic parts, and the spontaneous combustion phenomenon of the rechargeable battery is mainly the combustion of the plastic parts. The combustion of plastic parts of electric automobiles and electric bicycles depends on three factors, namely: the magnitude of the spark current, the duration of the spark current, and the ambient temperature.

The requirement of the spontaneous combustion of the plastic part on the spark current is different due to the different environmental temperatures in winter and summer, and the spontaneous combustion of the spark current with high current is difficult to form in a short time due to the lower environmental temperature in winter. In summer, however, due to the higher ambient temperature, a short spark current is sufficient to reach all conditions required for autoignition.

Referring to fig. 9, the embodiment further provides a method for processing a digital signal by the autoignition protection device, which specifically includes the following steps:

step S1: the counter in the central processing unit counts the number of times of transmitting the digital signal by the spark signal processing circuit in the preset time, and acquires the number of times of transmitting the digital signal by the spark signal processing circuit in the preset time according to the number recorded in the counter in the preset time.

Specifically, the counter takes a value of the spark signal every 1 second, and the number in the counter is incremented by 1 every time the spark signal is taken. After 20 seconds of continuous value taking, the digital size in the counter is obtained. Wherein the digital size in the counter is capable of characterizing the duration of the spark signal.

Step S2: and setting a warning repair value, a warning value and an interrupt value in the central processing unit, wherein the sizes of the warning repair value, the warning value and the interrupt value are continuously increased in sequence. Meanwhile, the warning value and the interruption value are determined according to the external environment temperature value of the batteries of the electric automobile and the electric bicycle. Specifically, the corresponding alert value and the interrupt value when the external environment is in summer will both be smaller than the corresponding alert value and interrupt value when the external environment is in winter. In the present embodiment, the warning repair value is selected to be 3, the alert value is selected to be 10, and the interrupt value is selected to be 15.

Step S3: and judging the relation between the number of times of transmission and the warning repair value and the warning value according to the number of times of transmission of the digital signal by the spark signal processing circuit in the preset time, namely according to the number in the counter. The method comprises the following steps:

when the number of times of transmitting the digital signal is smaller than the warning repair value 3, the batteries of the electric automobile and the electric bicycle are free from any problem in the charging process, so that the warning repair module, the audible and visual alarm module and the cut-off charging and discharging module are not started after receiving the signals transmitted by the central processing unit.

When the number of times of transmitting the digital signal is not less than the warning repair value 3 but less than the guard value 10, there are cases where the battery of the electric automobile and the electric bicycle is in poor contact, the inside of the battery is ignited, and the like during the charging, but the case does not cause the battery to be spontaneously ignited. The central processing unit sends out warning repair signals to the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module, and the warning repair module is started, and the audible and visual alarm module and the cut-off charge-discharge module are not started.

When the number of times of transmitting the digital signal is not less than the guard value 10, the battery of the electric automobile and the electric bicycle is very close to the condition of spontaneous combustion in the charging process, and then the next step is needed to be executed.

Step S4: and judging the relation between the value corresponding to the digital signal transmitted by the temperature processing circuit and the warning value and the interruption value according to the value corresponding to the digital signal transmitted by the temperature processing circuit. The method comprises the following steps:

when the value corresponding to the digital signal transmitted by the temperature processing circuit is not less than the warning value 10 but less than the interrupt value 15, the central processing unit sends out an alarm signal to the warning repair module, the audible and visual alarm module and the cut-off charging and discharging module, and then the audible and visual alarm module is started, and the warning repair module and the cut-off charging and discharging module are not started.

When the value corresponding to the digital signal transmitted by the temperature processing circuit is not smaller than the interrupt value 15, the central processing unit sends out a self-interrupt signal to the warning repair module, the audible and visual alarm module and the cut-off charge and discharge module, and then the cut-off charge and discharge module is started, and neither the warning repair module nor the audible and visual alarm module is started.

The invention and its embodiments have been described above by way of illustration and not limitation, and the actual construction and method of construction illustrated in the accompanying drawings is not limited to this. Therefore, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical scheme are not creatively designed without departing from the gist of the present invention, and all the structural manners and the embodiments belong to the protection scope of the present invention.

Claims (1)

1. An electric automobile and electric bicycle charge-discharge spontaneous combustion protection device, its characterized in that: the protection device comprises a spark extraction circuit, a spark signal processing circuit, a central processing unit, a temperature processing circuit and an output circuit, wherein the spark extraction circuit transmits spark signals generated in the charging process of batteries of electric automobiles and electric bicycles to the spark signal processing circuit, the spark signal processing circuit carries out analog-to-digital conversion on the spark signals and transmits converted digital signals to the central processing unit, the temperature processing circuit carries out analog-to-digital conversion on temperature signals detected by environments where the batteries of the electric automobiles and the electric bicycles are located and transmits the converted digital signals to the central processing unit, and the central processing unit receives the digital signals transmitted by the spark signal processing circuit and the digital signals transmitted by the temperature processing circuit, processes the digital signals and transmits the processed digital signals to the output circuit;

the spark extraction circuit comprises a switch S1, a first broadband current transformer CT, a first resistor R1, a first capacitor C1 and a first diode D1, wherein both ends of a primary coil of the first broadband current transformer CT are electrically connected with charging circuits of batteries of the electric automobile and the electric bicycle, one end of a secondary coil of the first broadband current transformer CT is electrically connected with an input end of the first resistor R1, an input end of the first capacitor C1 and an anode of the first diode D1, the other end of the secondary coil of the first broadband current transformer CT is electrically connected with an output end of the first resistor R1 and an output end of the first capacitor C1, the other end of the secondary coil of the first broadband current transformer CT, the output end of the first resistor R1 and the output end of the first capacitor C1 are grounded, and a cathode of the first diode D1 is electrically connected with an input end of the spark signal processing circuit;

the spark signal processing circuit comprises a second broadband current transformer and an analog-to-digital conversion circuit, wherein the second broadband current transformer receives a spark signal transmitted by the spark extraction circuit, converts the spark signal into an anti-interference detection unidirectional voltage form, simultaneously transmits the spark signal in the anti-interference detection unidirectional voltage form to the analog-to-digital conversion circuit for analog-to-digital conversion, and the analog-to-digital conversion circuit transmits the converted digital signal to the central processor;

the temperature processing circuit comprises a temperature sensor and an analog-to-digital conversion circuit, wherein the temperature sensor senses the external environment temperature of batteries of the electric automobile and the electric bicycle, transmits the temperature signal to the analog-to-digital conversion circuit for analog-to-digital conversion, and transmits the converted digital signal to the central processing unit;

the central processing unit is one of various digital signal processing chips and is used for judging whether the batteries of the electric automobile and the electric bicycle are spontaneously ignited in the charging process;

the output circuit comprises a warning repair module, an audible and visual alarm module and a cut-off charge-discharge module, wherein the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module are electrically connected with the output end of the central processing unit through different ports, and a parallel time sequence relationship exists among the warning repair module, the audible and visual alarm module and the cut-off charge-discharge module;

the warning repair module comprises a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a second diode D2, a third diode D3 and a first triode Q1, wherein the input end of the second resistor R2 is electrically connected with the output end of the central processing unit, the output end of the second resistor R2 is electrically connected with the base electrode of the first triode Q1, the collector electrode of the first triode Q1 is electrically connected with the input end of the third resistor R3 and the input end of the fourth resistor R4, the output end of the third resistor R3 and the output end of the fourth resistor R4 are electrically connected with the anode of the second diode D2, the acousto-optic alarm module and the cut-off charge-discharge module, the cathode of the second diode D2 is electrically connected with the anode of the third diode D3, the cathode of the third diode D3 is electrically connected with the input end of the fifth resistor R5, and the emitter of the first triode Q1 and the output end of the fifth resistor R5 are grounded;

the audible and visual alarm module comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth diode D4, a fifth diode D5, a second triode Q2 and a loudspeaker LS, wherein the input end of the sixth resistor R6 is electrically connected with the output end of the central processing unit, the output end of the sixth resistor R6 is electrically connected with the base electrode of the second triode Q2, the collector electrode of the second triode Q2 is electrically connected with the input end of the seventh resistor R7 and the input end of the eighth resistor R8, the output end of the seventh resistor R7 and the output end of the eighth resistor R8 are electrically connected with the anode of the fourth diode D4, the warning module and the cut-off charging and discharging module, the cathode of the fourth diode D4 is electrically connected with the anode of the fifth diode D5 and the input end of the loudspeaker LS, the cathode of the fifth diode D5 is electrically connected with the input end of the ninth resistor R9, the output end of the loudspeaker LS is electrically connected with the output end of the ninth resistor R9, and the output end of the ninth resistor R9 and the emitter of the second triode Q2 are grounded;

the charge-discharge cutting module comprises a tenth resistor R10, an eleventh resistor R11, a third triode Q3 and a solid-state relay J, wherein the input end of the tenth resistor R10 is electrically connected with the output end of the central processing unit, the output end of the tenth resistor R10 is electrically connected with the base electrode of the third triode Q3, the collector electrode of the third triode Q3 is electrically connected with the input end of the eleventh resistor R11 and the input end of the solid-state relay J, the output end of the eleventh resistor R11 is electrically connected with the input end of the solid-state relay J, the warning repair module and the audible and visual alarm module, and the output end of the solid-state relay J and the emitter electrode of the third triode Q3 are grounded;

the method for processing the digital signal by the electric automobile and the electric bicycle charge-discharge spontaneous combustion protection device specifically comprises the following steps:

step S1: the method comprises the steps that a counter in the central processing unit counts the number of times of transmitting digital signals by a spark signal processing circuit in preset time, and the number of times of transmitting digital signals by the spark signal processing circuit in preset time is obtained according to the numbers recorded in the counter in the preset time;

step S2: setting a warning repair value, a warning value and an interrupt value in the central processing unit, wherein the sizes of the warning repair value, the warning value and the interrupt value are sequentially increased;

step S3: judging the relation between the number of times and the warning repair value and the warning value according to the number of times of the spark signal processing circuit transmitting the digital signal in the preset time, wherein the relation is specifically as follows:

when the number of times is smaller than a warning repair value, the warning repair module, the audible and visual alarm module and the cut-off charging and discharging module are not started;

when the number of times is not less than the warning repair value and less than the warning value, the warning repair module is started according to a signal sent by the central processing unit, and the audible and visual alarm module and the cut-off charging and discharging module are not started;

when the number of times is not smaller than the warning value, executing the next step;

step S4: judging the relation between the value corresponding to the digital signal transmitted by the temperature processing circuit and the warning value and the interrupt value according to the value corresponding to the digital signal transmitted by the temperature processing circuit, wherein the relation is specifically as follows:

when the value corresponding to the digital signal transmitted by the temperature processing circuit is not less than the warning value and less than the interrupt value, the audible and visual alarm module is started according to the signal sent by the central processing unit, and the warning repair module and the cut-off charging and discharging module are not started;

when the value corresponding to the digital signal transmitted by the temperature processing circuit is not smaller than the interrupt value, the cut-off charging and discharging module is started according to the signal sent by the central processing unit, and the warning repair module and the audible and visual alarm module are not started.