Automobile emergency starting power supply based on lithium iron phosphate battery

Abstract

The application discloses a kind of automobile emergency starting power supply based on lithium iron phosphate battery, it is related to automobile emergency technical field, including automobile power module, for with automobile power connection;Emergency power supply module is used for power failure detection and emergency power supply control;First battery module, with the second battery module parallel power supply, and when voltage detection module detects low voltage, with the second battery module series power supply;Voltage detection module is used for low voltage detection to first battery module;Temperature detection module is used for low temperature detection when emergency power supply;Trigger control module is used for controlling first battery module and second battery module series when low temperature low voltage;High voltage control module is used for high voltage detection and control trigger control module stop working.The application based on lithium iron phosphate battery automobile emergency starting power supply can control the connection mode of lithium iron phosphate battery pack when low temperature low voltage, to meet the emergency power supply demand, improve power supply efficiency.

Description

Technical Field

[0001] This invention relates to the field of automotive emergency technology, specifically to an automotive emergency jump starter based on a lithium iron phosphate battery. Background Technology

[0002] A car jump starter is used to start a car when it is out of power or cannot be started for other reasons. It includes a rechargeable circuit. When the car battery is depleted and the car cannot start, the jump starter can be connected to the car battery to provide starting power. Current car jump starters are generally composed of multiple sets of environmentally friendly lithium iron phosphate batteries. However, lithium iron phosphate batteries have poor low-temperature performance. At low temperatures, the lithium iron phosphate battery pack cannot provide the working voltage required by the car jump starter in time, and therefore cannot provide emergency power control in time. Therefore, it needs to be improved. Summary of the Invention

[0003] This invention provides an emergency jump starter for automobiles based on a lithium iron phosphate battery to address the problems mentioned in the background section.

[0004] According to an embodiment of the present invention, an emergency jump starter for automobiles based on a lithium iron phosphate battery is provided, comprising: an automobile power module, an emergency power supply module, a first battery module, a second battery module, a voltage detection module, a trigger control module, a temperature detection module, and a high voltage control module.

[0005] The vehicle power module is connected to the emergency power supply module and is used to connect to the vehicle power supply and receive DC power and receive first emergency power or second emergency power transmitted by the emergency power supply module.

[0006] The emergency power supply module is used to detect the power failure of DC power, and when no DC power is detected, it outputs a first power supply signal and transmits the first emergency power or the second emergency power output by the first battery module to the vehicle power module.

[0007] The first battery module is connected to the emergency power module, the second battery module and the trigger control module. It is used to provide first electrical energy and receive second electrical energy provided by the second battery module, and connect the first electrical energy and the second electrical energy in parallel to provide first emergency electrical energy. When it receives the first control signal output by the trigger control module, it connects in series with the second battery module and superimposes the second electrical energy to provide second emergency electrical energy.

[0008] The second battery module is used to provide a second electrical energy;

[0009] A voltage detection module, connected to the first battery module, is used to sample the voltage of the first electrical energy and output a second control signal when the sampled signal is lower than a set low voltage threshold.

[0010] The temperature detection module is connected to the emergency power supply module and the second battery module. When the first power supply signal is received, it receives the second electrical energy and performs temperature detection. When the detected temperature signal is lower than the set low temperature threshold, it outputs a third control signal.

[0011] The trigger control module, connected to the voltage detection module, temperature detection module and high voltage control module, is used to perform high-level self-locking and output the first control signal when a third control signal is received during the period of receiving the second control signal, and to stop outputting the first control signal when a reset signal is received from the high voltage control module.

[0012] The high-voltage control module is connected to the first battery module and the second battery module. When a first control signal is received, the module samples the voltage of the first battery module and the second battery module in series. When the sampled voltage signal is greater than a set high-voltage threshold, the module outputs a reset signal.

[0013] As a further embodiment of the present invention: the first battery module includes a first battery pack, a second battery pack, a third resistor, a third thyristor, a second thyristor, a fourth thyristor, a second switching transistor, and a fourth resistor; the second battery module includes a third battery pack and a fourth battery pack;

[0014] Preferably, the first end of the first battery pack is connected to one end of the third thyristor and is connected to the control terminal of the third thyristor, the control terminal of the second thyristor, and the collector of the second switch via a third resistor. The second end of the first battery pack is connected to the first end of the second battery pack. The second end of the second battery pack is connected to one end of the second thyristor and one end of the fourth thyristor. The other end of the third thyristor is connected to the first end of the third battery pack and the other end of the fourth thyristor. The second end of the third battery pack is connected to the first end of the fourth battery pack. The other end of the second thyristor is connected to the emitter of the second switch, the second end of the fourth battery pack, and ground. The base of the second switch is connected to the control terminal of the fourth thyristor and the trigger control module via a third resistor.

[0015] As a further embodiment of the present invention: the temperature detection module includes a first power transistor, a first thermistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first comparator;

[0016] Preferably, the drain of the first power transistor is connected to the first terminal of the third battery pack, the source of the first power transistor is connected to one terminal of the first thermistor and connected to the non-inverting terminal of the first comparator and one terminal of the seventh resistor through the sixth resistor, the other terminal of the first thermistor is connected to the inverting terminal of the first comparator and connected to the other terminal of the seventh resistor and the second terminal of the fourth battery pack through the fifth resistor, the output terminal of the first comparator is connected to the trigger control module, and the gate of the first power transistor is connected to the emergency power supply module.

[0017] As a further embodiment of the present invention: the trigger control module includes a first diode, a first logic chip, and a first switching transistor;

[0018] Preferably, the cathode of the first diode is connected to the A terminal of the first logic chip and the output terminal of the first comparator, the anode of the first diode is connected to the Y terminal of the first logic chip, the collector of the first switching transistor and the control terminal of the fourth thyristor, the B terminal of the first logic chip is connected to the voltage detection module, the emitter of the first switching transistor is connected to the second terminal of the fourth battery pack, and the base of the first switching transistor is connected to the high voltage control module.

[0019] As a further embodiment of the present invention: the high-voltage control module includes a first thyristor, a first resistor, a second resistor, a second comparator, and a high-voltage threshold device;

[0020] Preferably, one end of the first thyristor is connected to the first end of the first battery pack, the other end of the first thyristor is connected to one end of the second resistor and the non-inverting input of the second comparator through the first resistor, the inverting input of the second comparator is connected to the high voltage threshold device, the other end of the second resistor is connected to the second end of the fourth battery pack, and the output of the second comparator is connected to the base of the first switching transistor.

[0021] As a further embodiment of the present invention: the voltage detection module includes an eighth resistor, a ninth resistor, a third comparator, and a low-voltage threshold device;

[0022] Preferably, one end of the eighth resistor is connected to the first end of the first battery pack, the other end of the eighth resistor is connected to the inverting input of the third comparator and connected to the second end of the second battery pack through the ninth resistor, the non-inverting input of the third comparator is connected to the low-voltage threshold device, and the output of the third comparator is connected to the B end of the first logic chip.

[0023] As a further embodiment of the present invention: the emergency power supply module includes a tenth resistor, a first optocoupler, a first power supply, an eleventh resistor, and a second power transistor; the automotive power module includes an automotive power interface;

[0024] Preferably, the source of the second power transistor is connected to the first terminal of the automotive power interface and connected to the first terminal of the first optocoupler through the tenth resistor. The second terminal of the first optocoupler is connected to the second terminal of the automotive power interface and the ground terminal. The third terminal of the first optocoupler is connected to the gate of the first power transistor and the gate of the second power transistor and connected to the first power supply through the eleventh resistor. The fourth terminal of the first optocoupler is grounded. The drain of the second power transistor is connected to the first terminal of the first battery pack.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The emergency starting power supply for automobiles based on lithium iron phosphate batteries can detect power failure of the automobile power module by the emergency power supply module and transmit the electrical energy provided by the first battery module and the second battery module when power failure occurs. In emergency power supply, the temperature detection module detects the temperature and the voltage detection module detects the voltage of the first battery module. When the voltage is lower than the set low voltage threshold at low temperature, in order to avoid the low temperature characteristics of the lithium iron phosphate batteries used in the first and second battery modules, the trigger control module will control the first and second battery modules to be connected in series to supply power to meet the power supply requirements. When the high voltage detection module detects that the series voltage exceeds the high voltage threshold or the voltage provided by the first battery module is greater than the low voltage threshold, the first and second battery modules will be connected in parallel to supply power to meet the emergency power supply requirements and improve the power supply efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic block diagram of a car emergency jump starter based on a lithium iron phosphate battery, provided as an embodiment of the present invention.

[0028] Figure 2 A circuit diagram of an automotive emergency jump starter based on a lithium iron phosphate battery is provided for an embodiment of the present invention.

[0029] Figure 3 The circuit diagram is provided for a voltage detection module according to an embodiment of the present invention.

[0030] Figure 4 The circuit diagram of the emergency power supply module provided in the embodiment of the present invention. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In one embodiment, see Figure 1An emergency jump starter for automobiles based on lithium iron phosphate batteries includes: an automobile power module 1, an emergency power supply module 2, a first battery module 3, a second battery module 4, a voltage detection module 5, a trigger control module 6, a temperature detection module 7, and a high voltage control module 8.

[0033] Specifically, the vehicle power module 1 is connected to the emergency power supply module 2 and is used to connect to the vehicle power supply and receive DC power and receive the first emergency power or the second emergency power transmitted by the emergency power supply module 2.

[0034] Emergency power supply module 2 is used to detect power failure of DC power, and when no DC power is detected, outputs a first power supply signal and transmits the first emergency power or the second emergency power output by the first battery module 3 to the vehicle power module 1;

[0035] The first battery module 3 is connected to the emergency power module, the second battery module 4 and the trigger control module 6. It is used to provide first electrical energy and receive second electrical energy provided by the second battery module 4, and connect the first electrical energy and the second electrical energy in parallel to provide first emergency electrical energy. When it receives the first control signal output by the trigger control module 6, it connects in series with the second battery module 4 and superimposes the second electrical energy to provide second emergency electrical energy.

[0036] The second battery module 4 is used to provide a second electrical energy;

[0037] The voltage detection module 5 is connected to the first battery module 3 and is used to sample the voltage of the first electrical energy and output a second control signal when the sampled signal is lower than the set low voltage threshold.

[0038] Temperature detection module 7 is connected to the emergency power module and the second battery module 4. When the first power supply signal is received, it receives the second power and performs temperature detection. When the detected temperature signal is lower than the set low temperature threshold, it outputs a third control signal.

[0039] The trigger control module 6 is connected to the voltage detection module 5, the temperature detection module 7 and the high voltage control module 8. When the second control signal is received, if the third control signal is received, it will perform high-level self-locking and output the first control signal. When the reset signal output by the high voltage control module 8 is received, it will stop outputting the first control signal.

[0040] The high-voltage control module 8 is connected to the first battery module 3 and the second battery module 4. When a first control signal is received, the module samples the voltage of the first battery module 3 and the second battery module 4 in series. When the sampled voltage signal is greater than the set high-voltage threshold, the module outputs a reset signal.

[0041] In a specific embodiment, the aforementioned automotive power module 1 can be an automotive power circuit composed of an automotive power interface, which can be connected to the automotive power supply so that the emergency power supply module 2 can provide emergency power when the automotive power supply fails. The aforementioned emergency power supply module 2 can be an emergency power supply circuit composed of optocouplers, field-effect transistors, resistors, etc., which can detect the power failure of the automotive power module 1 and, when power failure occurs, transfer the electrical energy provided by the first battery module 3 to the automotive power module 1, or transfer the electrical energy provided by the automotive power module 1 to the first battery module 3. The aforementioned first battery module 3 can be a first battery circuit composed of lithium iron phosphate battery packs, silicon controlled rectifiers, transistors, etc., which can store energy and supply power and is connected in parallel with the second battery module 4. When it receives the signal output by the trigger control module 6, it connects in series with the second battery module 4 to supply power. The aforementioned second battery module 4 can be a first battery circuit composed of lithium iron phosphate battery packs. The two-battery circuit stores energy and supplies power. The voltage detection module 5 can be a voltage detection circuit composed of a resistor, comparator, and low-voltage threshold device, which can sample the voltage of the first battery module 3 and compare the sampled signal with the voltage of the set low-voltage threshold. The trigger control module 6 can be a trigger control circuit composed of a logic chip, diode, and transistor, which can perform logic calculations and output a first control signal when the temperature is low and the voltage is low, and stop outputting the first control signal when the voltage is high. The temperature detection module 7 can be a temperature detection circuit composed of a thermistor, field-effect transistor, and comparator, which can perform temperature detection and low-temperature judgment during emergency power supply. The high-voltage control module 8 can be a high-voltage control circuit composed of a thyristor, high-voltage threshold device, and comparator, which can perform high-voltage detection on the first battery module 3 and the second battery module 4 connected in series when the temperature is low and the voltage is low.

[0042] In another embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The first battery module 3 includes a first battery pack, a second battery pack, a third resistor R3, a third thyristor S3, a second thyristor S2, a fourth thyristor S4, a second switch V2, and a fourth resistor R4; the second battery module 4 includes a third battery pack and a fourth battery pack.

[0043] Specifically, the first end of the first battery pack is connected to one end of the third thyristor S3 and is connected to the control terminal of the third thyristor S3, the control terminal of the second thyristor S2, and the collector of the second switch V2 through the third resistor R3. The second end of the first battery pack is connected to the first end of the second battery pack. The second end of the second battery pack is connected to one end of the second thyristor S2 and one end of the fourth thyristor S4. The other end of the third thyristor S3 is connected to the first end of the third battery pack and the other end of the fourth thyristor S4. The second end of the third battery pack is connected to the first end of the fourth battery pack. The other end of the second thyristor S2 is connected to the emitter of the second switch V2, the second end of the fourth battery pack, and the ground terminal. The base of the second switch V2 is connected to the control terminal of the fourth thyristor S4 and the trigger control module 6 through the third resistor.

[0044] In a specific embodiment, the first battery pack, the second battery pack, the third battery pack, and the fourth battery pack are all composed of lithium iron phosphate battery packs; the second thyristor S2, the third thyristor S3, and the fourth thyristor S4 can all be bidirectional thyristors; and the second switching transistor V2 can be an NPN transistor.

[0045] Furthermore, the temperature detection module 7 includes a first power transistor Q1, a first thermistor NTC1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and a first comparator A1;

[0046] Specifically, the drain of the first power transistor Q1 is connected to the first terminal of the third battery pack, the source of the first power transistor Q1 is connected to one terminal of the first thermistor NTC1 and is connected to the non-inverting terminal of the first comparator A1 and one terminal of the seventh resistor R7 through the sixth resistor R6, the other terminal of the first thermistor NTC1 is connected to the inverting terminal of the first comparator A1 and is connected to the other terminal of the seventh resistor R7 and the second terminal of the fourth battery pack through the fifth resistor R5, the output terminal of the first comparator A1 is connected to the trigger control module 6, and the gate of the first power transistor Q1 is connected to the emergency power supply module 2.

[0047] In a specific embodiment, the first power transistor Q1 can be an N-channel field-effect transistor; the first thermistor NTC1 can be a negative temperature coefficient thermistor; the sixth resistor R6 and the seventh resistor R7 are set with low temperature thresholds; and the first comparator A1 can be an LM358 comparator.

[0048] Furthermore, the trigger control module 6 includes a first diode D1, a first logic chip J1, and a first switching transistor V1;

[0049] Specifically, the cathode of the first diode D1 is connected to the A terminal of the first logic chip J1 and the output terminal of the first comparator A1, the anode of the first diode D1 is connected to the Y terminal of the first logic chip J1, the collector of the first switching transistor V1 and the control terminal of the fourth thyristor S4, the B terminal of the first logic chip J1 is connected to the voltage detection module 5, the emitter of the first switching transistor V1 is connected to the second terminal of the fourth battery pack, and the base of the first switching transistor V1 is connected to the high voltage control module 8.

[0050] In a specific embodiment, the first logic chip J1 can be an AND gate chip, which, together with the first diode D1, performs high-level self-locking control on the input signal; the first switching transistor V1 can be an NPN transistor.

[0051] Furthermore, the high-voltage control module 8 includes a first thyristor S1, a first resistor R1, a second resistor R2, a second comparator A2, and a high-voltage threshold device;

[0052] Specifically, one end of the first thyristor S1 is connected to the first end of the first battery pack, and the other end of the first thyristor S1 is connected to one end of the second resistor R2 and the non-inverting input of the second comparator A2 through the first resistor R1. The inverting input of the second comparator A2 is connected to the high voltage threshold device, and the other end of the second resistor R2 is connected to the second end of the fourth battery pack. The output of the second comparator A2 is connected to the base of the first switching transistor V1.

[0053] In a specific embodiment, the first thyristor S1 can be a bidirectional thyristor; the first resistor R1 and the second resistor R2 are used for voltage sampling; the high voltage threshold device can be composed of a reference power supply and a resistor to provide a high voltage threshold, which is the maximum voltage value required by the automotive power module 1; the second comparator A2 can be an LM358 comparator.

[0054] Furthermore, the voltage detection module 5 includes an eighth resistor R8, a ninth resistor R9, a third comparator A3, and a low-voltage threshold device;

[0055] Specifically, one end of the eighth resistor R8 is connected to the first end of the first battery pack, the other end of the eighth resistor R8 is connected to the inverting input of the third comparator A3 and connected to the second end of the second battery pack through the ninth resistor R9, the non-inverting input of the third comparator A3 is connected to the low-voltage threshold device, and the output of the third comparator A3 is connected to the B end of the first logic chip J1.

[0056] In a specific embodiment, the eighth resistor R8 and the ninth resistor R9 are used for voltage sampling; the first comparator A1 can be an LM358 comparator; the low voltage threshold device can be composed of a reference power supply and a resistor to provide a low voltage threshold, which is half of the minimum voltage value required by the automotive power module 1.

[0057] Furthermore, the emergency power supply module 2 includes a tenth resistor R10, a first optocoupler J2, a first power supply VCC1, an eleventh resistor R11, and a second power transistor Q2; the automotive power module 1 includes an automotive power interface.

[0058] Specifically, the source of the second power transistor Q2 is connected to the first terminal of the automotive power interface and is connected to the first terminal of the first optocoupler J2 through the tenth resistor R10. The second terminal of the first optocoupler J2 is connected to the second terminal of the automotive power interface and the ground terminal. The third terminal of the first optocoupler J2 is connected to the gate of the first power transistor Q1 and the gate of the second power transistor Q2 and is connected to the first power supply VCC1 through the eleventh resistor R11. The fourth terminal of the first optocoupler J2 is grounded. The drain of the second power transistor Q2 is connected to the first terminal of the first battery pack.

[0059] In a specific embodiment, the first optocoupler J2 can be a PC817 optocoupler; the second power transistor Q2 can be an N-channel field-effect transistor.

[0060] In this embodiment, a car emergency jump starter based on a lithium iron phosphate battery is provided. The car power interface is connected to the power supply terminal of the car power source. A first optocoupler J2, along with tenth resistor R10, eleventh resistor R11, and first power supply VCC1, performs power-off detection on the DC power supplied to the car power interface. Upon power failure, it triggers the second power transistor Q2 and the first power transistor Q1 to conduct. At this time, the first battery pack triggers the third thyristor S3 and the second thyristor S2 to conduct. The first battery pack in series is connected in parallel with the second battery pack, and the third and fourth battery packs in series, providing the first emergency power. A first thermistor NTC1 performs temperature detection. When the detected temperature is lower than the low-temperature threshold set by the sixth resistor R6 and the seventh resistor R7, the A terminal of the first logic chip J1 becomes high. The eighth resistor R8 and the ninth resistor R9 sample the voltage of the first and second battery packs in series. When the signal is lower than the low-voltage threshold set by the low-voltage threshold device, the B terminal of the first logic chip J1 becomes high, causing the first logic chip J1, in conjunction with the first diode D1, to self-lock and output the first control signal when the sampled signal is lower than the low-voltage threshold. This controls the first thyristor S1, the first switch V1, and the fourth thyristor S4 to conduct, allowing the first, second, third, and fourth battery packs to be connected in series to provide power and second emergency power. Either the first or second emergency power will be transmitted to the vehicle power interface through the second power transistor Q2. Because the lithium iron phosphate battery pack releases heat during discharge, causing the operating temperature to rise, when the voltage of the first battery module 3 and the second battery module 4 connected in series exceeds the high-voltage threshold set by the high-voltage threshold device, the voltage of the first battery module 3 is greater than the low-voltage threshold, or the voltage is not at a low temperature, the first battery module 3 and the second battery module 4 resume parallel power supply to meet the power demand.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A car emergency jump starter based on a lithium iron phosphate battery, characterized in that: The lithium iron phosphate battery-based automotive emergency jump starter includes: an automotive power module, an emergency power supply module, a first battery module, a second battery module, a voltage detection module, a trigger control module, a temperature detection module, and a high-voltage control module. The vehicle power module is connected to the emergency power supply module and is used to connect to the vehicle power supply and receive DC power and receive first emergency power or second emergency power transmitted by the emergency power supply module. The emergency power supply module is used to detect the power failure of DC power, and when no DC power is detected, it outputs a first power supply signal and transmits the first emergency power or the second emergency power output by the first battery module to the vehicle power module. The first battery module is connected to the emergency power module, the second battery module and the trigger control module. It is used to provide first electrical energy and receive second electrical energy provided by the second battery module, and connect the first electrical energy and the second electrical energy in parallel to provide first emergency electrical energy. When it receives the first control signal output by the trigger control module, it connects in series with the second battery module and superimposes the second electrical energy to provide second emergency electrical energy. The second battery module is used to provide a second electrical energy; The voltage detection module is connected to the first battery module and is used to sample the voltage of the first electrical energy and output a second control signal when the sampled signal is lower than the set low voltage threshold. The temperature detection module is connected to the emergency power supply module and the second battery module. When the first power supply signal is received, it receives the second electrical energy and performs temperature detection. When the detected temperature signal is lower than the set low temperature threshold, it outputs a third control signal. The trigger control module is connected to the voltage detection module, temperature detection module and high voltage control module. When the second control signal is received, if the third control signal is received, the module will perform high-level self-locking and output the first control signal. When the reset signal output by the high voltage control module is received, the module will stop outputting the first control signal. The high-voltage control module is connected to the first battery module and the second battery module. When a first control signal is received, the module samples the voltage of the first battery module and the second battery module in series. When the sampled voltage signal is greater than a set high-voltage threshold, the module outputs a reset signal.

2. The automotive emergency jump starter based on a lithium iron phosphate battery according to claim 1, characterized in that, The first battery module includes a first battery pack, a second battery pack, a third resistor, a third thyristor, a second thyristor, a fourth thyristor, a second switching transistor, and a fourth resistor; the second battery module includes a third battery pack and a fourth battery pack. The first end of the first battery pack is connected to one end of the third thyristor and is connected to the control terminal of the third thyristor, the control terminal of the second thyristor, and the collector of the second switch through the third resistor. The second end of the first battery pack is connected to the first end of the second battery pack. The second end of the second battery pack is connected to one end of the second thyristor and one end of the fourth thyristor. The other end of the third thyristor is connected to the first end of the third battery pack and the other end of the fourth thyristor. The second end of the third battery pack is connected to the first end of the fourth battery pack. The other end of the second thyristor is connected to the emitter of the second switch, the second end of the fourth battery pack, and ground. The base of the second switch is connected to the control terminal of the fourth thyristor and the trigger control module through the third resistor.

3. The automotive emergency jump starter based on a lithium iron phosphate battery according to claim 2, characterized in that, The temperature detection module includes a first power transistor, a first thermistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first comparator; The drain of the first power transistor is connected to the first terminal of the third battery pack. The source of the first power transistor is connected to one terminal of the first thermistor and is connected to the non-inverting terminal of the first comparator and one terminal of the seventh resistor through the sixth resistor. The other terminal of the first thermistor is connected to the inverting terminal of the first comparator and is connected to the other terminal of the seventh resistor and the second terminal of the fourth battery pack through the fifth resistor. The output terminal of the first comparator is connected to the trigger control module, and the gate of the first power transistor is connected to the emergency power supply module.

4. A car emergency jump starter based on a lithium iron phosphate battery according to claim 3, characterized in that, The trigger control module includes a first diode, a first logic chip, and a first switching transistor; The cathode of the first diode is connected to the A terminal of the first logic chip and the output terminal of the first comparator. The anode of the first diode is connected to the Y terminal of the first logic chip, the collector of the first switching transistor, and the control terminal of the fourth thyristor. The B terminal of the first logic chip is connected to the voltage detection module. The emitter of the first switching transistor is connected to the second terminal of the fourth battery pack. The base of the first switching transistor is connected to the high voltage control module.

5. A car emergency jump starter based on a lithium iron phosphate battery according to claim 4, characterized in that, The high-voltage control module includes a first thyristor, a first resistor, a second resistor, a second comparator, and a high-voltage threshold device; One end of the first thyristor is connected to the first end of the first battery pack, and the other end of the first thyristor is connected to one end of the second resistor and the non-inverting input of the second comparator through the first resistor. The inverting input of the second comparator is connected to the high voltage threshold device, and the other end of the second resistor is connected to the second end of the fourth battery pack. The output of the second comparator is connected to the base of the first switching transistor.

6. A car emergency jump starter based on a lithium iron phosphate battery according to claim 5, characterized in that, The voltage detection module includes an eighth resistor, a ninth resistor, a third comparator, and a low-voltage threshold device. One end of the eighth resistor is connected to the first end of the first battery pack, and the other end of the eighth resistor is connected to the inverting input of the third comparator and connected to the second end of the second battery pack through the ninth resistor. The non-inverting input of the third comparator is connected to the low-voltage threshold device, and the output of the third comparator is connected to the B end of the first logic chip.

7. A car emergency jump starter based on a lithium iron phosphate battery according to claim 6, characterized in that, The emergency power supply module includes a tenth resistor, a first optocoupler, a first power supply, an eleventh resistor, and a second power transistor; the automotive power module includes an automotive power interface. The source of the second power transistor is connected to the first terminal of the automotive power interface and connected to the first terminal of the first optocoupler through the tenth resistor. The second terminal of the first optocoupler is connected to the second terminal of the automotive power interface and the ground terminal. The third terminal of the first optocoupler is connected to the gate of the first power transistor and the gate of the second power transistor and connected to the first power supply through the eleventh resistor. The fourth terminal of the first optocoupler is grounded. The drain of the second power transistor is connected to the first terminal of the first battery pack.

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