A safe and intelligent starting power supply with lead-acid battery detection function

Abstract

A safe and intelligent starting power supply with a lead-acid battery detection function comprises a main circuit having an internal power supply, a constant current source, a control module and a main circuit of a starting output port; the internal power supply comprises a cell circuit having multiple cells connected in series, a sampling circuit and a dynamic balancing circuit, the sampling circuit samples the voltage of each cell in the cell circuit and transmits it to the control module, and the dynamic balancing circuit performs balanced regulation on the voltages of all cells in the cell circuit under the control of the control module, so that the voltage of each cell does not exceed a preset maximum error voltage; the starting output port comprises positive and negative pole contacts, the positive pole of the internal power supply is connected to the positive pole of the external power supply through the positive pole contact, the negative pole of the internal power supply is connected to the negative pole of the external power supply through the negative pole contact, and a first switch K1 is connected in series between the positive pole of the internal power supply and the positive pole contact of the starting output port. The present invention ensures the safety of the starting power supply and can realize the monitoring of the health status of the lead-acid battery.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle-mounted starting power supplies, and in particular to a safe and intelligent starting power supply with a lead-acid battery detection function. Background Art

[0002] As the scale of automobile emergency starting power supply gradually expands, lithium batteries used as starting power supply have caught fire, smoked, and exploded from time to time. In order to solve this safety problem, the existing lithium battery starting industry practice is to use three or four strings of high-rate lithium batteries in series to provide hundreds of amperes of working current to the motor at the moment of starting, thereby providing the necessary working torque for the starting motor. In actual applications, lithium batteries directly output to the motor, and the so-called addition of intelligent ignition clips in the industry only determines whether it can be started by detecting the total voltage of the lithium battery in actual applications. Only the total voltage of the lithium battery pack cannot fundamentally judge the quality of the battery pack. For example: we set the lithium battery to be four cells in series, and the corresponding voltages of the first, second, and third cells are all 4V, the fourth is 3V, and the total voltage is 15V. If the actual starting voltage required is 14V, the total voltage of the lithium battery is greater than the actual starting voltage required, and it can be started. However, after starting, there is a greater risk of damage to the fourth cell, so it cannot really protect the lithium battery.

[0003] Existing vehicle-mounted starting power supply products still have the following defects:

[0004] Lithium batteries are used as starting power sources. In order to increase the sales of starting power products, many additional functions are often added. All of these functions rely on the power supply of lithium batteries, which increases the frequency of lithium batteries being used. It also increases the probability of using the starting function when the lithium battery cell voltage is low. During the use of lithium batteries, the imbalance will gradually become more serious with the increase in the number of uses. The imbalance of the cell is fatal to the starting of the lithium battery.

[0005] Due to the characteristics of large starting current of lithium battery starting, it is impossible to add too many protection components in the starting main circuit. Adding these components will inevitably increase the loop impedance in the circuit. Increasing the loop impedance will inevitably reduce the starting performance and also increase the cost significantly.

[0006] In addition, lead-acid batteries cannot start normally, and consumers lack effective judgment basis during use. Therefore, it is extremely important to judge the lead-acid battery through the design of the starting power supply. Summary of the invention

[0007] Based on this, the present invention provides a safe and intelligent starting power supply with a lead-acid battery detection function to solve the above technical problems existing in the existing automobile emergency starting power supply.

[0008] To achieve the above object, the present invention provides a safe and intelligent starting power supply with a lead-acid battery detection function, comprising a main circuit, the main circuit having an internal power supply, a constant current source, a control module, and a starting output port;

[0009] The internal power supply comprises a cell circuit, and a sampling circuit and a dynamic balancing circuit connected to the cell circuit. The cell circuit comprises a plurality of cells connected in series. The sampling circuit is used to sample the voltage of each cell in the cell circuit and transmit the sample to the control module. The dynamic balancing circuit is used to balance and regulate the voltages of all cells in the cell circuit under the control of the control module so that the voltage of each cell does not exceed a preset maximum error voltage.

[0010] The startup output port has positive and negative contacts, the positive electrode of the internal power supply is used to connect to the positive electrode of the external power supply through the positive contact, the negative electrode of the internal power supply is used to connect to the negative electrode of the external power supply through the negative contact, and a first switch K1 is connected in series between the positive electrode of the internal power supply and the positive electrode contact of the startup output port, and the first switch K1 is connected in parallel with a second switch K2 and a sampling resistor R0 connected in series, the second switch K2 is located on the side connected to the positive electrode of the internal power supply, and the sampling resistor R0 is located on the side connected to the positive electrode contact; one end of the constant current source is connected to the common end, and the other end is connected to one end of the sampling resistor R0 for connecting to the second switch K2 through the third switch K3; voltage sampling points V1 and V2 are respectively provided at both ends of the sampling resistor R0, and the voltage sampling points V1 and V2 are respectively connected to the control module for voltage sampling; the on and off of the first switch K1, the second switch K2 and the third switch K3 are all controlled by the control module.

[0011] As a further preferred technical solution of the present invention, the internal power supply is a lithium battery pack, and the external power supply is a lead-acid battery.

[0012] As a further preferred technical solution of the present invention, the main circuit also has an auxiliary power supply, and the auxiliary power supply is connected to the positive electrode of the internal power supply.

[0013] As a further preferred technical solution of the present invention, the main circuit further comprises an output sampling circuit, and the control module samples the magnitude of the current flowing through the positive electrode contact through the output sampling circuit.

[0014] As a further preferred technical solution of the present invention, the starting output port is equipped with plug-in battery wires, there are two battery wires, and the two battery wires are respectively connected to the corresponding electrode ends, so that the positive and negative contacts of the starting output port are connected and conductive with the positive and negative contacts of the external power supply.

[0015] As a further preferred technical solution of the present invention, each battery cell in the battery cell circuit is connected in parallel with a discharge resistor.

[0016] As a further preferred technical solution of the present invention, the safe and intelligent starting power supply also includes a power supply housing, and the main circuit is arranged in the power supply housing.

[0017] As a further preferred technical solution of the present invention, the main circuit also includes a plurality of functional ports connected in parallel, each functional port is connected to an internal power supply, all functional ports are controlled by a control module, and a fifth switch is connected in series in each parallel branch line where each functional port is located.

[0018] As a further preferred technical solution of the present invention, the functional port is a USB input port, a USB output port, a 19V output port, an LED light connection port or a 10W wireless charging port, wherein the USB input port is used to charge the internal power supply, the USB output port is used for data communication and DC power output, the 19V output port is used for 19V power output, the LED light connection port is used to connect to an indicator light set on the power supply housing, and the 10W wireless charging port is used to wirelessly charge external devices.

[0019] As a further preferred technical solution of the present invention, the USB input port, USB output port, 19V output port and start output port are respectively arranged on the four side walls of the power supply housing, and a digital display control panel is provided on the top surface of the power supply housing, which is connected to the control module.

[0020] The safe and intelligent starting power supply with lead-acid battery detection function of the present invention adopts the above technical solution, so that it uses the voltage difference generated by the internal resistance of the battery cell of the internal power supply under the instantaneous large current as the judgment basis, instead of only looking at the actual total voltage of all the battery cells in the starting power supply, thereby theoretically ensuring the safety of the starting power supply; at the same time, it has the function of detecting the lead-acid battery of the car, and can realize the monitoring of the health status of the lead-acid battery, which has the following beneficial effects:

[0021] 1) The voltage of each battery cell in the internal power supply is balanced through dynamic balancing, thereby reducing the risk of damage during high current starting due to imbalance of the battery cells;

[0022] 2) By detecting the internal resistance of the lead-acid battery, the lead-acid battery can be tested and judged;

[0023] 3) Eliminate the influence of loop resistance on the internal resistance measurement of lead-acid battery through the principle of charge and discharge, and measure the loop resistance at the same time. By calculating the loop resistance, the peak current value of startup can be accurately measured for reference in actual use;

[0024] 4) The internal resistance of the internal power supply will produce an instantaneous voltage difference when discharging with a large current. This voltage difference can be used to determine the number of times the battery has been started and whether the battery is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] Figure 1 A principle block diagram of an example of a safe intelligent starting power supply with a lead-acid battery detection function provided by the present invention;

[0027] Figure 2 A circuit diagram of an example provided for a battery cell circuit;

[0028] Figure 3 A circuit diagram of an example provided for a sampling circuit;

[0029] Figure 4 A circuit diagram of an example provided for a dynamic balancing circuit;

[0030] Figure 5 This is the equivalent schematic diagram for lead-acid battery testing.

[0031] Figure 6 A one-way structural diagram of the safe and intelligent starting power supply with lead-acid battery detection function;

[0032] Figure 7 Another perspective of the structure diagram of the safe and intelligent starting power supply with lead-acid battery detection function.

[0033] Figure 6 Middle: 1. Power housing, 2. Status indicator light, 3. Power switch, 4. Start output port, 5. USB output port, 6. Charging port, 7. Digital display control panel, 8. Battery wire, 9. Clamp, 10. Air pipe, 11. Air nozzle connector, 12. Air nozzle, 13. Triangle indicator light.

[0034] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The terms such as "upper", "lower", "left", "right", "middle" and "one" cited in the preferred embodiments are only for the convenience of description, and are not used to limit the scope of the present invention. The change or adjustment of the relative relationship shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0036] like Figures 1 to 7As shown, the present invention provides a safe and intelligent starting power supply with a lead-acid battery detection function, including a main circuit, wherein the main circuit has an internal power supply, a constant current source, a control module, and a starting output port, wherein the starting output port is used to connect to an external power supply, so that the main circuit can start the external power supply in a working mode through the internal power supply. In addition, the external power supply can also be detected in a detection mode. In this embodiment, the internal power supply is a lithium battery pack, and the external power supply is a lead-acid battery.

[0037] The internal power supply has a battery cell circuit, and a sampling circuit and a dynamic balancing circuit connected to the battery cell circuit. The battery cell circuit has multiple battery cells connected in series. The sampling circuit is used to sample the voltage of each battery cell in the battery cell circuit and transmit it to the control module. The dynamic balancing circuit is used to balance and regulate the voltages of all battery cells in the battery cell circuit under the control of the control module so that the voltage of each battery cell does not exceed a preset maximum error voltage.

[0038] For the sake of convenience, this embodiment takes a lithium battery pack with four cells as an example. Figure 2 As shown, the sampling circuit and dynamic balance circuit refer to Figure 3 and Figure 4 As shown, the positive connection point of each battery cell in the battery circuit is defined as BAT2+, V3-2+, V2-2+ and V1-2+ respectively, and each of the four battery cells is connected in parallel with a discharge resistor, which is defined as R1, R2, R3 and R4 respectively. A switch is also connected to the parallel branch where each discharge resistor is located, which is defined as K4, K5, K6 and K7 respectively.

[0039] Figure 3 The BAT2+, V3-2+, V2-2+ and V1-2+ contacts in the circuit are connected to the corresponding contacts of the battery cell circuit respectively, V012, V022, V032 and V042 are four voltage sampling points connected to the control module respectively, 5V-VDD2 is the driving end of the sampling circuit, and its driving signal is sent by the control module. After receiving the signal of the control module at the 5V-VDD2 end, the sampling circuit is controlled to work, wherein: through the voltage divider filter circuit composed of R32, R27 and C26, the voltage of the fourth battery is sampled and calculated and output to the control module through V042; through the voltage divider filter circuit composed of R16, R89 and C54, the voltage of the third battery is sampled and calculated and output to the control module through V032; through the voltage divider filter circuit composed of R71, R94 and C97, the voltage of the second battery is sampled and calculated and output to the control module through V022; through the filter circuit composed of R17 and C53, the voltage of the first battery is sampled and output to the control module through V012.

[0040] In actual applications, the minimum voltage of each cell is set to less than 1V at the moment of startup through the program, and the startup output can be immediately turned off. Then, the maximum voltage difference ΔVmax generated by each cell at the moment of startup is recorded, and the protection voltage value is updated based on it, and VST ≥ 1 + ΔVmax is set as the condition for starting (starting output to the external power supply); if VST < 1 + ΔVmax, the protection cannot be started, fundamentally eliminating the damage that may be caused by startup.

[0041] Figure 4 The BAT2+, V3-2+, V2-2+ and V1-2+ contacts are respectively connected to the corresponding contacts of the battery circuit, and CTL-BC1, CTL-BC2, CTL-BC3 and CTL-BC4 are respectively connected to the control module to receive the driving signal sent by the control module. When the dynamic balancing circuit is working, the control module is connected through Q9, R66, and CTL-BC4 to form a basic simple balancing circuit, and the fourth battery cell is balanced and regulated; the control module is connected through Q8 and R58, and CTL-BC3 to form a basic simple balancing circuit, and the third battery cell is balanced and regulated; the control module is connected through Q25 and R52, and CTL-BC4 to form a basic simple balancing circuit, and the second battery cell is balanced and regulated; the control module is connected through Q26 and R11, and CTL-BC1 to form a basic simple balancing circuit, and the first battery cell is balanced and regulated.

[0042] In the specific implementation, the sampling circuit and the dynamic balancing circuit work together to Figure 3 Each cell is sampled to accurately determine the voltage of each cell. The maximum error voltage of the cell voltage is set to 20mV. When the voltage of any cell is greater than 20mV, the output will be discharged at the same time with the lowest cell voltage as the reference, so that the voltage difference of each cell is less than the set 20mV, thereby ensuring the balance of the cell and keeping the cell in good working condition.

[0043] The circuit for balancing the cells is a dynamic balancing design. As long as the voltage difference is greater than the set 20mV, any cell that exceeds the voltage will reach the same voltage as the smallest cell through the corresponding discharge resistor, thereby achieving battery cell balancing. Moreover, this balancing is not affected by powering on and off, so that the purpose of balancing can be achieved through the accumulation of time.

[0044] The startup output port has positive and negative contacts, the positive electrode of the internal power supply is used to connect to the positive electrode of the external power supply through the positive contact, the negative electrode of the internal power supply is used to connect to the negative electrode of the external power supply through the negative contact, and a first switch K1 is connected in series between the positive electrode of the internal power supply and the positive electrode contact of the startup output port, and the first switch K1 is connected in parallel with a second switch K2 and a sampling resistor R0 connected in series, the second switch K2 is located on the side connected to the positive electrode of the internal power supply, and the sampling resistor R0 is located on the side connected to the positive electrode contact; one end of the constant current source is connected to the common end, and the other end is connected to the sampling resistor R0 through a third switch K3 for connecting the second switch K2 One end of the common end is connected, wherein the common end is at the same potential as the negative electrode of the internal power supply; voltage sampling points V1 and V2 are respectively provided at both ends of the sampling resistor R0, and the voltage sampling points V1 and V2 are respectively connected to the control module for voltage sampling; the on and off of the first switch K1, the second switch K2 and the third switch K3 are all controlled by the control module. When the first switch K1 is connected, the main circuit enters the working mode and starts the output of the external power supply through the internal power supply. When the first switch K1 is disconnected, the main circuit enters the test mode and detects the external power supply. During the detection process, the second switch K2 and the third switch K3 can be regulated to change the state of the control loop.

[0045] Preferably, the main circuit also has an auxiliary power supply and an output sampling circuit. The auxiliary power supply is connected to the positive electrode of the internal power supply. The control module samples the current flowing through the positive electrode contact through the output sampling circuit.

[0046] In order to allow those skilled in the art to further understand the technical solution of the present invention, the working principle of the present invention for detecting lead-acid batteries is described in detail below:

[0047] Assumption: the line loop resistance is Ro, the internal resistance of the lead-acid battery is ro; set the sampling resistance R0 = 10Ω, and the constant current source current is Io = 0.1A.

[0048] The equivalent circuit for testing lead-acid batteries is as follows: Figure 5 As shown, during the detection process, the voltages of the voltage sampling points V1 and V2 are recorded in three steps respectively, and K1 remains disconnected during the test. The specific steps are as follows:

[0049] The first step is to measure the voltages at points V1 and V2 when K2 and K3 are disconnected. The voltage measured at this time is the initial voltage of the lead-acid battery. The voltage at point V1 is V1a, and the voltage at point V2 is V2a. V1a=V2a;

[0050] In the second step, when K2 is disconnected and K3 is connected, the voltages at points V1 and V2 are measured respectively. At this time, the voltage at point V1 is measured to be V1b, and the voltage at point V2 is measured to be V2b.

[0051] Step 3: When K3 is disconnected and K2 is connected, the voltages at points V1 and V2 are measured respectively. At this time, the voltage at point V1 is measured to be V1c, and the voltage at point V2 is measured to be V2c. At the same time, the current detected by the output sampling circuit is I1.

[0052] In summary, the following derivation formula can be obtained:

[0053] I1=(V2c-V1c) / R0(1)

[0054] V2c=I1*Ro+I1*ro+V2a(2)

[0055] V2b=V2a-Io*Ro-I1*ro(3)

[0056] From formula (2), we can deduce:

[0057] Ro=V2c-(I1*ro+V2a) / I1(4)

[0058] From equations (3) and (4), we can deduce:

[0059] ro=(V2a*R0+V1c*(V2b-1)+V2c(1-V2b-(Io+1)*R0)) / 2Io*(V2c-V1c)(5)

[0060] Substituting the parameters Io = 0.1A, R0 = 10Ω into the above formula, we get:

[0061] ro=(V2a*10+V1c*(V2b-1)+V2c(1-V2b-(0.1+1)*10)) / 2*0.1*(V2c-V1c)=(10V2a+V1c*

[0062] (V2b-1)+V2c(1-V2b-11)) / 0.2*(V2c-V1c)=(50V2a+5V1c*(V2b-1)+5V2c(1-V2b-11))

[0063] / (V2c-V1c)(6)

[0064] Analyzing the above derived formula, we can get:

[0065] A. In formula (6), the resistance parameter of the measuring loop is not included, which means that the influence of the loop resistance on the internal resistance of the starting power supply is theoretically eliminated.

[0066] B. By testing the voltage value across the sampling resistor, the internal resistance of the lead-acid battery can be accurately measured;

[0067] C. In formula (2), the loop resistance Ro can be accurately calculated, so the peak current at startup can be accurately measured by measuring the voltage at points V1 and V2;

[0068] D. Analysis of formula (6) shows that there are only V2a, V2b, V2c, and V1c in the formula. The measured starting power supply voltage has nothing to do with the initial voltage of the lead-acid battery to be tested. Therefore, it can be concluded that the measured lead-acid battery voltage or capacity does not affect the test accuracy.

[0069] Conclusion: Through the above equivalent circuit, the internal resistance of the lead-acid battery can be well measured, so that the quality of the battery can be easily judged according to its internal resistance, that is, the purpose of measuring the quality of the lead-acid battery is achieved.

[0070] This embodiment can also realize multiple protection functions (input undervoltage, output overcurrent, output short circuit, output polarity reverse connection, output overtemperature), among which:

[0071] Output overcurrent protection: From formula (4), the loop resistance Ro can be calculated. By measuring the voltage of Ro, the output current can be calculated. By setting the voltage on Ro, the overcurrent protection value can be set.

[0072] Output short circuit or output reverse polarity protection: before starting, the control module will detect the output voltage. If the input voltage is less than or equal to zero, it will be identified as a short circuit or reverse polarity. The control module will always shut down the output and can issue a corresponding alarm to achieve short circuit or reverse polarity protection.

[0073] This case uses the voltage difference generated by the internal resistance of the battery cells of the internal power supply under instantaneous large current as the basis for judgment, rather than just looking at the actual total voltage of all the battery cells of the internal power supply, which theoretically ensures the safety of the starting power supply; at the same time, it has the function of detecting the lead-acid battery of the car, thereby monitoring the health status of the lead-acid battery.

[0074] The appearance structure of the safe intelligent starting power supply with lead-acid battery detection function of the present invention is as follows Figure 6 and Figure 7 As shown by Figure 6 and Figure 7 It can be seen that the present invention also includes a power supply housing, and the main circuit is arranged in the power supply housing, so that the main circuit can be well protected and prevented from external damage and pollution.

[0075] In a specific implementation, the starting output port 4 is equipped with a plug-in battery wire 8, there are two battery wires 8, and the two battery wires 8 are respectively connected to the corresponding electrode ends, so that the positive and negative contacts of the starting output port 4 are connected and conducted with the positive and negative electrodes of the external power supply. The end of the battery wire 8 used to connect to the external power supply is provided with a clamping member 9, so that it is very convenient to connect to the external power supply. In addition, a spring sheet is added to the clamping member 9 to increase the contact area when the clamping member 9 clamps an object, reduce the contact resistance, and improve the starting effect.

[0076] In another specific implementation, the main circuit also includes a plurality of functional ports connected in parallel, each functional port is connected to an internal power supply, all functional ports are controlled by a control module, and a fifth switch is connected in series in each parallel branch line where each functional port is located.

[0077] In one embodiment, the functional ports are a USB input port, a USB output port 5, a 19V output port, an LED light connection port or a 10W wireless charging port, wherein the USB input port can be used as a charging interface 6 for charging an internal power supply, the USB output port 5 is used for data communication and DC power output, the 19V output port is used for 19V power output, the LED light connection port has two groups, one group is used to connect to a status indicator light 2 set on the power supply housing 1, and the other group is used to connect to a triangular indicator light 13 set on the bottom surface of the power supply housing 1, and the 10W wireless charging port is used to wirelessly charge external devices.

[0078] Specifically, the USB input port, USB output port 5, 19V output port and start output port 4 are arranged on the four side walls of the power supply housing 1 so that each functional port can be conveniently connected to an external device. A digital display control panel 7 is provided on the top surface of the power supply housing 1. The digital display control panel 7 is connected to the control module. The digital display control panel 7 can be used to display relevant parameters on the control module and input parameters. A power switch 3 is also provided on the power supply housing 1. The power switch 3 is connected to the control module to realize the on / off control of the startup power supply.

[0079] The safe and intelligent starting power supply with lead-acid battery detection function of the present invention can also integrate other functional modules according to actual needs. For example, the power housing 1 has an air pump and a tire pressure monitoring circuit built in. The air pump and the tire pressure monitoring circuit are evenly powered by internal power and controlled by the control module. The power housing is provided with an air pipe 10 connected to the air pump. The air pipe 10 and the power housing are detachably connected. The end of the air pipe is provided with an air nozzle connector 11. During use, the air nozzle connector 11 is connected to the tire of the car, and the air pump is started to inflate the tire. At the same time, the tire pressure monitoring circuit detects the air pressure of the air pipe 10 to monitor the tire pressure of the car tire. In addition, the air nozzle connector 11 is also equipped with a variety of different types of air nozzles 12. The air nozzle connector 11 is connected to the air nozzle 12 to inflate the pneumatic device. It is flexible and convenient to use.

[0080] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to the embodiments without departing from the principles and essence of the present invention. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A safe and intelligent starting power supply with lead-acid battery detection function, characterized in that: The main circuit includes an internal power supply, a constant current source, a control module, and a start output port; The internal power supply comprises a cell circuit, and a sampling circuit and a dynamic balancing circuit connected to the cell circuit. The cell circuit comprises a plurality of cells connected in series. The sampling circuit is used to sample the voltage of each cell in the cell circuit and transmit the sample to the control module. The dynamic balancing circuit is used to balance and regulate the voltages of all cells in the cell circuit under the control of the control module so that the voltage of each cell does not exceed a preset maximum error voltage. The startup output port has positive and negative contacts, the positive pole of the internal power supply is used to connect to the positive pole of the external power supply through the positive contact, the negative pole of the internal power supply is used to connect to the negative pole of the external power supply through the negative contact, and a first switch K1 is connected in series between the positive pole of the internal power supply and the positive pole contact of the startup output port, and the first switch K1 is connected in parallel with a second switch K2 and a sampling resistor R0 connected in series, the second switch K2 is located on the side connected to the positive pole of the internal power supply, and the sampling resistor R0 is located on the side connected to the positive pole contact; one end of the constant current source is connected to the common end, and the other end is connected to one end of the sampling resistor R0 for connecting to the second switch K2 through the third switch K3; voltage sampling points V1 and V2 are respectively provided at both ends of the sampling resistor R0, and the voltage sampling points V1 and V2 are respectively connected to the control module for voltage sampling; the on and off of the first switch K1, the second switch K2 and the third switch K3 are all controlled by the control module; in, The maximum voltage difference ΔVmax generated by each battery cell at the moment of startup is recorded, and the protection voltage value is updated based on this value. VST ≥ 1 + ΔVmax is set as the startup condition; if VST < 1 + ΔVmax, the protection cannot be started.

2. The safe and intelligent starting power supply with lead-acid battery detection function according to claim 1, characterized in that: The internal power source is a lithium battery pack, and the external power source is a lead-acid battery.

3. The safe and intelligent starting power supply with lead-acid battery detection function according to claim 1, characterized in that: The main circuit also has an auxiliary power supply, which is connected to the positive pole of the internal power supply.

4. The safe and intelligent starting power supply with lead-acid battery detection function according to claim 1, characterized in that: The main circuit also has an output sampling circuit, and the control module samples the magnitude of the current flowing through the positive electrode contact through the output sampling circuit.

5. The safe and intelligent starting power supply with lead-acid battery detection function according to claim 1, characterized in that: The starting output port is equipped with two battery wires for plug-in connection, and the two battery wires are respectively connected to corresponding electrode ends, so that the positive and negative contacts of the starting output port are connected and conducted with the positive and negative electrodes of the external power supply.

6. The safe and intelligent starting power supply with lead-acid battery detection function according to claim 1, characterized in that: Each battery cell in the battery cell circuit is connected in parallel with a discharge resistor.

7. The safe intelligent starting power supply with lead-acid battery detection function according to any one of claims 1 to 6, characterized in that: The safe and intelligent starting power supply further comprises a power supply housing, and the main circuit is arranged in the power supply housing.

8. The safe intelligent starting power supply with lead-acid battery detection function according to claim 7, characterized in that: The main circuit also includes a plurality of functional ports connected in parallel, each functional port is connected to an internal power supply, all functional ports are controlled by a control module, and a fifth switch is connected in series in each parallel branch line where each functional port is located.

9. The safe intelligent starting power supply with lead-acid battery detection function according to claim 8, characterized in that: The functional ports are a USB input port, a USB output port, a 19V output port, an LED light connection port or a 10W wireless charging port, wherein the USB input port is used to charge the internal power supply, the USB output port is used for data communication and DC power output, the 19V output port is used for 19V power output, the LED light connection port is used to connect to an indicator light set on the power supply housing, and the 10W wireless charging port is used to wirelessly charge external devices.

10. The safe and intelligent starting power supply with lead-acid battery detection function according to claim 9, characterized in that: The USB input port, USB output port, 19V output port and start output port are respectively arranged on the side walls around the power supply housing. The top surface of the power supply housing is provided with a digital display control panel, which is connected to the control module.

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