Starting power supply device capable of being charged reversely

Abstract

The utility model discloses a starting power supply device capable of being charged reversely. The starting power supply device comprises a main control module, a rechargeable battery connected with the main control module, and an electric quantity detection module connected with the main control module and the rechargeable battery. The electric quantity detection module is used for detecting the electric quantity of the rechargeable battery to generate an electric quantity signal and sending the electric quantity signal to the main control module; the main control module is used for acquiring the electric quantity signal to determine the electric quantity of the rechargeable battery, and acquiring electric energy from an automobile storage battery to reversely charge the rechargeable battery when the electric quantity of the rechargeable battery is lower than preset electric quantity; the electric quantity detection module is arranged to detect the electric quantity of the rechargeable battery in real time, and when the electric quantity of the rechargeable battery is lower than the preset electric quantity, the main control module controls the automobile storage battery to charge the rechargeable battery in time, so that the electric quantity of the rechargeable battery is sufficient, the rechargeable battery can be effectively protected, and the situation that the rechargeable battery is damaged due to feed is avoided.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a reverse-chargeable starting power supply device. Background Technology

[0002] The car jump starter is a multi-functional portable power source developed for users who travel by car.

[0003] However, users have found several problems with traditional jump starters in actual use: insufficient battery power necessitates the use of external charging equipment, which is inconvenient and may even be impossible to charge in rural areas; after repeated use, the battery capacity may become insufficient, leading to power depletion and potential damage if not recharged promptly; in low-temperature regions, the jump starter may not be able to ignite multiple times due to the low temperature; it consumes a lot of power when not in use for extended periods; and it may not be able to completely disconnect. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, this utility model provides a reverse-chargeable starting power supply device that uses the car battery to charge the rechargeable battery when the battery power is insufficient, thereby ensuring that the rechargeable battery has sufficient power and protecting it.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] This utility model provides a reverse-chargeable starting power supply device, including a main control module, a rechargeable battery connected to the main control module, and a power detection module connected to the main control module and the rechargeable battery;

[0007] The power detection module is used to detect the power of the rechargeable battery to generate a power signal, and send the power signal to the main control module;

[0008] The main control module is used to acquire the power signal to determine the power level of the rechargeable battery, and when the power level of the rechargeable battery is lower than a preset power level, it obtains power from the car battery to reverse charge the rechargeable battery.

[0009] Optionally, the rechargeable battery is electrically connected to the car battery via a bidirectional control module;

[0010] The bidirectional control module includes a magnetic latching relay, a forward control circuit connected to the main control module and the magnetic latching relay, and a reverse control circuit connected to the main control module and the magnetic latching relay.

[0011] The forward control circuit is used to receive the forward control signal from the main control module, and based on the forward control signal, control the magnetic latching relay to close.

[0012] The reverse control circuit is used to receive the reverse control signal from the main control module, and based on the reverse control signal, control the magnetic latching relay to disconnect.

[0013] Optionally, the magnetic latching relay is a bidirectional magnetic latching relay.

[0014] Optionally, after the car is started, the power detection module detects the power of the rechargeable battery in real time, the bidirectional control module remains connected, and the main control module starts the car battery to reverse charge the rechargeable battery when the power of the rechargeable battery is lower than the preset power.

[0015] Optionally, the power detection module includes a detection transistor, a first resistor, and a second resistor; the main control module outputs a control signal to control the detection transistor to conduct; after the detection transistor is conducted, the positive terminal of the rechargeable battery is divided by the first resistor and the second resistor, and the voltage at one end of the detection transistor is connected to the detection port of the main control module.

[0016] Optionally, it may also include a temperature detection module and / or a heating module connected to the main control module;

[0017] The temperature detection module is used to detect the temperature of the rechargeable battery;

[0018] When the temperature of the rechargeable battery is lower than the preset temperature, the main control module activates the heating module to heat the rechargeable battery.

[0019] Optionally, when the temperature of the rechargeable battery reaches a first heating temperature, the main control module controls the output of the rechargeable battery to start the vehicle.

[0020] Optionally, when the temperature of the rechargeable battery reaches the second heating temperature, the main control module controls the heating module to stop working.

[0021] Optionally, the temperature detection module includes an NTC sensor, which is in contact with the rechargeable battery and is used to detect the temperature of the rechargeable battery.

[0022] Optionally, the heating module includes a heating element that contacts the rechargeable battery.

[0023] Optionally, it also includes a power display module connected to the main control module, the power display module being used to display the power level of the rechargeable battery.

[0024] Optionally, it may also include a lighting module connected to the main control module, the lighting module being used for illumination.

[0025] Optionally, it also includes a charging module for charging the rechargeable battery.

[0026] Optionally, a battery protection module is connected between the charging module and the rechargeable battery.

[0027] Optionally, it also includes a housing and a circuit board; the housing forms a receiving cavity for mounting the rechargeable battery and the circuit board, and the main control module is integrated on the circuit board.

[0028] Optionally, the housing includes an upper housing and a lower housing, and the interior of the upper housing and the lower housing forms the receiving cavity; the housing is provided with a positive charging clip and a negative charging clip; one end of the positive charging clip is connected to the positive terminal of the rechargeable battery, and the other end is used to connect to the car battery; one end of the negative charging clip is connected to the negative terminal of the rechargeable battery, and the other end is used to connect to the car battery.

[0029] Optionally, the housing is provided with a positive electrode storage portion for accommodating the positive electrode charging clip and a negative electrode storage portion for accommodating the negative electrode charging clip.

[0030] Optionally, the upper housing is provided with a power display structure, which includes a plurality of light-emitting diodes.

[0031] Optionally, the inner wall of the upper housing is provided with a plurality of partitions, which are arranged at intervals to accommodate a plurality of rechargeable batteries.

[0032] Optionally, two adjacent separators are connected by a fixing member, which is arranged in an arc shape toward the rechargeable battery to adapt to the rechargeable battery.

[0033] The beneficial effects of this invention are as follows: By setting a power detection module, the power level of the rechargeable battery is monitored in real time. When the battery power level is lower than a preset level, the main control module controls the car battery to charge the rechargeable battery, achieving reverse charging to ensure sufficient battery power and effectively protecting the battery from damage due to power depletion. Furthermore, by setting a temperature detection module, the temperature of the rechargeable battery can be monitored in real time. When the battery temperature is lower than a preset temperature, the main control module activates a heating module to heat the battery to maintain a high-rate output for vehicle starting. Furthermore, by setting a lighting module, illumination can be provided for users outdoors or in areas with poor visibility, enhancing user convenience. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0036] Figure 1 This is a schematic diagram illustrating the working principle of the starting power supply device according to an embodiment of the present invention.

[0037] Figure 2 This is a circuit diagram of the main control module, power detection module, temperature detection module, heating module, and power display module in an embodiment of the present utility model.

[0038] Figure 3 This is a circuit diagram of the rechargeable battery and bidirectional control module according to an embodiment of the present invention.

[0039] Figure 4 This is a circuit diagram of the lighting module in an embodiment of the present invention.

[0040] Figure 5 This is a circuit diagram of the charging module in an embodiment of the present invention.

[0041] Figure 6 This is a circuit diagram of the battery protection module according to an embodiment of the present invention.

[0042] Figure 7 This is a circuit diagram of the charging interface in an embodiment of the present invention.

[0043] Figure 8 This is a schematic diagram of the starting power supply device according to an embodiment of the present utility model;

[0044] Figure 9 This is a split view of the starting power supply device in one direction according to an embodiment of the present utility model;

[0045] Figure 10 This is a split view of the power supply device in another direction according to an embodiment of the present utility model;

[0046] The components are as follows: 10. Main control module; 11. Rechargeable battery; 12. Power detection module; 13. Two-way control module; 14. Temperature detection module; 15. Heating module; 16. Power display module; 17. Lighting module; 18. Charging module; 19. Battery protection module; 20. Housing; 201. Upper housing; 202. Lower housing; 203. Receiving cavity; 21. Circuit board; 22. Positive charging clip; 23. Negative charging clip; 24. Positive electrode storage part; 241. Positive electrode groove; 242. Positive electrode wire groove; 25. Negative electrode storage part; 251. Negative electrode groove; 252. Negative electrode wire groove; 26. Power display structure; 27. Separator; 28. Fixing component. Detailed Implementation

[0047] Reference Figures 1 to 10 A reverse-chargeable starting power supply device includes a main control module 10, a rechargeable battery 11 connected to the main control module 10, and a power detection module 12 connected to the main control module 10 and the rechargeable battery 11. The power detection module 12 is used to detect the power level of the rechargeable battery 11 to generate a power signal and send the power signal to the main control module 10. The main control module 10 is used to acquire the power signal to determine the power level of the rechargeable battery 11, and when the power level of the rechargeable battery 11 is lower than a preset power level, it draws power from the car battery to reverse charge the rechargeable battery 11.

[0048] In this embodiment, the starting power device serves as an emergency auxiliary power source when the car battery fails to start, and can charge the car battery via the main control module 11. By setting up a power detection module 12, the power level of the rechargeable battery 11 is monitored in real time. When the power level of the rechargeable battery 11 falls below a preset level, the main control module 10 promptly controls the car battery to reverse charge the rechargeable battery 11, ensuring the rechargeable battery 11 is fully charged. This effectively protects the rechargeable battery 11, preventing damage from power depletion and solving the problem of existing rechargeable batteries requiring external charging after multiple attempts to start. In this embodiment, the rechargeable battery 11 is a lithium battery, and multiple lithium batteries are connected to achieve better energy storage and supply.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, the power detection module 12 includes a detection transistor Q3, a first resistor R8, a second resistor R9, and a first capacitor C21; the main control module 10 outputs a control signal to control the detection transistor Q3 to conduct, and the positive terminal of the rechargeable battery 11 is voltage divided by the first resistor R8 and the second resistor R9, and one end of the detection transistor Q3 (i.e., Figure 3The voltage at terminal 2 of the detection transistor Q3 is used as a voltage divider point. The voltage at the voltage divider point is filtered by the first capacitor C21 and then connected to the detection port of the main control module 10. As the rechargeable battery voltage changes, the voltage at the voltage divider point also changes, thereby realizing the detection of the rechargeable battery 11's charge level. By setting the first capacitor C21 to filter the voltage at the voltage divider point, noise is reduced, ensuring high accuracy of the detected rechargeable battery charge level.

[0050] In one embodiment, such as Figures 1-3 As shown, the rechargeable battery 11 is electrically connected to the car battery via a bidirectional control module 13. The bidirectional control module 13 includes a magnetic latching relay K1, a forward control circuit connected to the main control module 10 and the magnetic latching relay K1, and a reverse control circuit connected to the main control module and the magnetic latching relay K1. The forward control circuit receives a forward control signal from the main control module 10 and controls the magnetic latching relay K1 to close based on the forward control signal. The reverse control circuit receives a reverse control signal from the main control module 10 and controls the magnetic latching relay K1 to open based on the reverse control signal. In this embodiment, by setting a forward control circuit to control the magnetic latching relay to close and a reverse control circuit to control the magnetic latching relay to open, the problem of the rechargeable battery output not being completely disconnected is solved. The magnetic latching relay K1 does not require continuous power supply to maintain its working state, which can significantly reduce energy waste. Furthermore, since the contact state of the magnetic latching relay K1 is maintained by the magnetic force generated by a permanent magnet, it can maintain its current state even after power failure, without requiring continuous power supply, which can effectively improve stability. In one embodiment, the magnetic latching relay K1 is a bidirectional magnetic latching relay.

[0051] Specifically, such as Figure 3 As shown, the forward control circuit includes a forward transistor Q1, a first forward MOSFET Q5 (G2S2D2), and a second forward MOSFET Q4 (G1S1D1). The forward transistor Q1 performs two-stage control, enabling the main control module 10 to control the first forward MOSFET Q5 (G2S2D2) and the second forward MOSFET Q4 (G1S1D1) to conduct. The main control module 10 outputs valid signals KS1 and KS2 as forward control signals to control the magnetic latching relay K1 to close.

[0052] The reverse control circuit includes an inverter Q2, a first reverse MOSFET Q4 (G2S2D2), and a second reverse MOSFET Q5 (G1S1D1). The inverter Q2 performs two-stage control, enabling the main control module 10 to control the first reverse MOSFET Q4 (G2S2D2) and the second reverse MOSFET Q5.

[0053] When (G1S1D1) is turned on, the main control module 10 outputs valid signals KS3 and KS4 as reverse control signals to control the magnetic latching relay K1 to disconnect.

[0054] It should be noted that "forward" and "reverse" are only used to describe the direction of signal transmission and are not limited. Therefore, valid signals KS1 and KS2 can be used as reverse control signals, while valid signals KS3 and KS4 can be used as forward control signals.

[0055] In this embodiment, a bidirectional control module 13 is connected between the car battery and the rechargeable battery 11. After the car is started, the power detection module 12 detects the power of the rechargeable battery 11 in real time, the bidirectional control module 13 remains connected, and the main control module 10 obtains power from the car battery to reverse charge the rechargeable battery 11 when the power of the rechargeable battery 11 is lower than the preset power.

[0056] In this embodiment, after the car is started, even if the power supply is not continued, the bidirectional control module 13 remains connected. When the power of the rechargeable battery 11 is low, the main control module 10 promptly controls the car battery to charge the rechargeable battery 11.

[0057] like Figure 2 As shown, the reverse-chargeable starting power supply device also includes a temperature detection module 14 and / or a heating module 15 connected to the main control module 10; the temperature detection module 14 is used to detect the temperature of the rechargeable battery 11; the heating module 15 is in contact with the rechargeable battery 11, and when the temperature of the rechargeable battery 11 is lower than a preset temperature, the main control module 10 activates the heating module 15 to heat the rechargeable battery 11. For a detailed circuit diagram of the temperature detection module 14 and the heating module 15, please refer to [link to circuit diagram]. Figure 2 The temperature detection module 14 includes an NTC sensor that contacts the rechargeable battery 11 for accurate temperature detection. The heating module 15 includes a heating element that contacts the rechargeable battery 11. In other embodiments, the heating module 15 may include a heating wire, a heating film, or a thermocouple, etc., which are not limited here. Normally, in low-temperature environments, the rechargeable battery 11 cannot be ignited multiple times due to the extremely low temperature, resulting in very low output efficiency. In this embodiment, the temperature of the rechargeable battery 11 is detected in real time, enabling automatic heating of the rechargeable battery 11 in low-temperature environments. This ensures that the rechargeable battery 11 is maintained at an appropriate temperature, allowing for high-rate output for vehicle starting. Even in low-temperature environments, the rechargeable battery 11 can still be ignited multiple times.

[0058] Specifically, when the temperature of the rechargeable battery 11 is lower than the preset temperature, the main control module 10 controls the heating module 15 to heat up; when the temperature of the rechargeable battery 11 reaches the first heating temperature, the main control module 10 obtains electrical energy from the car battery to reverse charge the rechargeable battery 11. When the temperature of the rechargeable battery 11 reaches the second heating temperature, the main control module 10 controls the heating module 15 to stop working. By setting the first heating temperature, the high-rate output of the rechargeable battery 11 is guaranteed; by setting the second heating temperature, the heating module 15 can be automatically stopped to prevent overheating and damage to the rechargeable battery 11. It should be noted that the preset temperature, the first heating temperature, and the second heating temperature can be set according to the actual situation, as long as the preset temperature is lower than the first heating temperature and the first heating temperature is lower than the second heating temperature. As an example, the preset temperature is 5 degrees Celsius, the first heating temperature is 12 degrees Celsius, and the second heating temperature is 20 degrees Celsius.

[0059] like Figure 2 As shown, the reverse-charging power supply device also includes a power display module 16 connected to the main control module 10. The power display module 16 is used to display the power level of the rechargeable battery 11. In this embodiment, by setting the power display module 16, the user can intuitively understand the remaining power level of the rechargeable battery 11. In other ways, the remaining power level of the rechargeable battery 11 can also be announced via audio.

[0060] like Figure 4 As shown, the reverse-chargeable starting power supply device also includes a lighting module 17 connected to the main control module 10, which is used for illumination. In this embodiment, by providing the lighting module 17, users can conveniently access lighting outdoors and in places with poor visibility. For example, it allows users to easily connect to the power supply line in a well-lit environment.

[0061] like Figure 5 As shown, the reverse-chargeable startup power supply device also includes a charging module 18 for reverse charging the rechargeable battery 11. In this embodiment, the charging module 18 is provided with a USB charging interface, which enables reverse charging of the rechargeable battery 11.

[0062] like Figure 6 As shown, a reverse-chargeable starting power supply device is connected to a battery protection module 19 between the charging module 18 and the rechargeable battery 11. In this embodiment, the battery protection module 19 has a current protection function to protect the rechargeable battery 11.

[0063] In one embodiment, such as Figure 7 and Figure 10As shown, the reverse-chargeable starting power supply device also includes a housing 20 and a circuit board 21; a receiving cavity 203 is formed within the housing 20 to house the rechargeable battery 11 and the circuit board 21, and the main control module 10 is integrated on the circuit board 21. In this embodiment, the main control module 10, the power detection module 12, the bidirectional control module 13, the temperature detection module 14, the heating module 15, the power display module 16, the lighting module 17, the charging module 18, and the battery protection module 19 are all integrated on the circuit board 21. In this embodiment, the circuit board 21 integrates the main control chip, the lighting chip, the battery protection chip, and the charging chip, wherein the main control module 10, the power detection module 12, the bidirectional control module 13, the temperature detection module 14, the heating module 15, and the power display module 16 are all encapsulated on the main control chip, the lighting module 17 is encapsulated on the lighting chip, the charging module 18 is encapsulated on the charging chip, and the battery protection module 19 is encapsulated on the battery protection chip to ensure efficient operation of each module. The main control chip uses low-power technology, which can maintain a longer standby time for the startup battery. Specifically, the power consumption of the main control chip is less than 50 milliwatts.

[0064] In one embodiment, such as Figure 5 and Figure 6 As shown, the housing 20 includes a matching upper housing 201 and a lower housing 2022, and the receiving cavity 203 is formed inside the upper housing 201 and the lower housing 2022; a positive charging clip 22 and a negative charging clip 23 are provided on the housing 20; one end of the positive charging clip 22 is connected to the positive terminal of the rechargeable battery 11, and the other end is used to connect to the car battery; one end of the negative charging clip 23 is connected to the negative terminal of the rechargeable battery 11, and the other end is used to connect to the car battery.

[0065] The housing 20 is provided with a positive electrode receiving portion 24 for accommodating the positive electrode charging clip 22 and a negative electrode receiving portion 25 for accommodating the negative electrode charging clip 23. By providing the positive electrode receiving portion 24 and the negative electrode receiving portion 25 to respectively accommodate the positive electrode charging clip 22 and the negative electrode charging clip 23, the positive electrode charging clip 22 and the negative electrode charging clip 23 can be better stored, thus protecting them from damage.

[0066] In one embodiment, such as Figure 5As shown, the positive electrode storage portion 24 includes a positive electrode groove 241 and a positive electrode wire groove 242 formed on the outer surface of the upper housing 201. The positive electrode groove 241 and the positive electrode wire groove 242 are connected to accommodate the positive electrode charging clip 22. The negative electrode storage portion 25 includes a negative electrode groove 251 and a negative electrode wire groove 252 formed on the outer surface of the upper housing 201. The negative electrode groove 251 and the negative electrode wire groove 252 are connected to accommodate the negative electrode charging clip 23. In this embodiment, the positive electrode charging clip 22 includes a positive electrode clip and a positive electrode connecting wire. The positive electrode clip is installed in the positive electrode groove 241, and the shape of the positive electrode groove 241 is adapted to the shape of the positive electrode clip. The positive electrode connecting wire is installed in the positive electrode wire groove 242, and the shape of the positive electrode wire groove 242 is adapted to the shape of the positive electrode connecting wire, ensuring better storage effect and protecting the positive electrode charging clip 22. Similarly, the negative charging clip 23 includes a negative clip and a negative connecting wire. The negative clip is installed in the negative groove 251, and the shape of the negative groove 251 is adapted to the shape of the negative clip. The negative connecting wire is installed in the negative wire groove 252, and the shape of the negative wire groove 252 is adapted to the shape of the negative connecting wire, ensuring better storage effect and protecting the negative charging clip 23.

[0067] The upper housing 201 is provided with a power display structure 26, which includes a plurality of light-emitting diodes (LEDs). In this embodiment, by setting a plurality of LEDs, the main control module 10 determines the remaining power of the rechargeable battery 11 based on the power detection module 12, and controls the LEDs to emit power corresponding to the remaining power, so that the user can intuitively understand the remaining power of the rechargeable battery 11. It is understood that other methods can also be used to display the remaining power of the rechargeable battery 11, such as using voice broadcast to remind the user of the remaining power of the rechargeable battery 11, or using an interface to display the remaining power of the rechargeable battery 11, which is not limited here.

[0068] The inner wall of the upper housing 201 is provided with a plurality of partitions 27, which are arranged at intervals to accommodate a plurality of rechargeable batteries 11. In this embodiment, the plurality of rechargeable batteries 11 are separated by the partitions 27 to better protect the rechargeable batteries 11 and prevent them from squeezing against each other.

[0069] Adjacent partitions 27 are connected to fixing members 28, which are arranged in an arc shape facing the rechargeable battery 11 to fit the rechargeable battery 11. Several fixing members 28 are connected to adjacent partitions 27 to ensure that the rechargeable battery 11 is stably installed on the fixing members 28, thus ensuring that the rechargeable battery 11 is stably installed on the housing 20.

[0070] The working process of this reverse-charging starting power supply device is as follows: When the car starts, the bidirectional control module 13 is connected, and the rechargeable battery 11 provides low-voltage power to the car. After startup, the bidirectional control module 13 remains connected, and the main control module 10 outputs a control signal to control the detection transistor of the power detection module 12 to conduct. The positive terminal of the rechargeable battery 11 is divided by a first resistor and a second resistor. One end of the detection transistor serves as the voltage divider point. The voltage at the voltage divider point is filtered by a first capacitor and then connected to the detection port of the main control module 10. As the battery voltage changes, the voltage at the voltage divider point also changes, thus realizing the power detection of the rechargeable battery 11. When the power of the rechargeable battery 11 is lower than the preset power, the main control module 10 controls the car battery to charge the rechargeable battery 11, realizing reverse charging of the rechargeable battery 11, so as to effectively protect the rechargeable battery and avoid damage from battery depletion. Furthermore, by setting a temperature detection module 14, the temperature of the rechargeable battery 11 can be monitored in real time. When the temperature of the rechargeable battery 11 is lower than a preset temperature, the main control module 10 activates the heating module 15 to heat the battery. When the temperature of the rechargeable battery 11 reaches a first heating temperature, the main control module 10 obtains electrical energy from the car battery to reverse charge the rechargeable battery 11. When the temperature of the rechargeable battery 11 reaches a second heating temperature, the main control module 10 controls the heating module 15 to stop working. By setting a first heating temperature, automatic heating of the rechargeable battery 11 can be achieved, ensuring high-rate output of the rechargeable battery 11. Furthermore, by setting a power display module 16, users can intuitively understand the remaining power of the rechargeable battery 11. Furthermore, by setting a lighting module 17, lighting can be provided for users outdoors or in places with poor visibility, facilitating other operations.

[0071] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the protection scope of this utility model.

[0072] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of this utility model is limited to these descriptions. Any methods or structures that are similar to or identical to those of this utility model, or any technical deductions or substitutions made based on the concept of this utility model, should be considered within the protection scope of this utility model.

Claims

1. A reverse-chargeable starting power supply device, characterized by comprising: The application relates to a charging battery control system, which comprises a main control module, a charging battery connected with the main control module, and an electric quantity detection module connected with the main control module and the charging battery. The electric quantity detection module is used for detecting the electric quantity of the charging battery to generate an electric quantity signal and sending the electric quantity signal to the main control module. The main control module is used for acquiring the electric quantity signal to determine the electric quantity of the charging battery and acquiring electric energy from an automobile storage battery to reversely charge the charging battery when the electric quantity of the charging battery is lower than a preset electric quantity, wherein the charging battery is electrically connected with the automobile storage battery through a bidirectional control module. The bidirectional control module comprises a magnetic latching relay, a forward control circuit connected with the main control module and the magnetic latching relay, and a reverse control circuit connected with the main control module and the magnetic latching relay. The forward control circuit is used for receiving a forward control signal of the main control module and controlling the magnetic latching relay to be closed based on the forward control signal. The reverse control circuit is used for receiving a reverse control signal of the main control module and controlling the magnetic latching relay to be opened based on the reverse control signal.

2. The reversible charging starting power supply device according to claim 1, characterized by, The magnetic latching relay is a bidirectional magnetic latching relay.

3. The reversible charging starting power supply device according to claim 1, characterized by, After the automobile is started, the electric quantity detection module detects the electric quantity of the charging battery in real time, the bidirectional control module keeps being connected, and the main control module starts the automobile storage battery to reversely charge the charging battery when the electric quantity of the charging battery is lower than the preset electric quantity.

4. The reversible charging starting power supply device according to claim 1, characterized by, The electric quantity detection module comprises a detection triode, a first resistor and a second resistor; the main control module outputs a control signal to control the detection triode to be turned on; after the detection triode is turned on, the positive pole of the charging battery is divided by the first resistor and the second resistor, and the voltage at one end of the detection triode is connected to a detection port of the main control module.

5. The reversible charging starting power supply device according to claim 1, characterized by, The application further comprises a temperature detection module and / or a heating module connected with the main control module. The temperature detection module is used for detecting the temperature of the charging battery. When the temperature of the charging battery is lower than a preset temperature, the main control module starts the heating module to heat the charging battery.

6. The reversible charging starting power supply device according to claim 5, wherein When the temperature of the charging battery reaches a first heating temperature, the main control module controls the charging battery to output to start the automobile.

7. The reversible charging starting power supply device according to claim 6, characterized by When the temperature of the charging battery reaches a second heating temperature, the main control module controls the heating module to stop working.

8. The reversible charging starting power supply device according to claim 5, wherein The temperature detection module comprises an NTC sensor which is in contact with the charging battery and is used for detecting the temperature of the charging battery.

9. The reversible charging starting power supply device according to claim 5, wherein The heating module comprises a heating sheet which is in contact with the charging battery.

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