Vehicle and battery power-deficient emergency start control circuit and control method

Abstract

The present application relates to a control circuit and a control method for emergency starting of a vehicle and its battery when it runs out of power, and belongs to the field of vehicle control technology. The control circuit for emergency starting of the vehicle when the battery runs out of power includes a power battery, a converter, a battery, and a high-voltage bypass distribution unit; the power battery is connected to the high-voltage bypass distribution unit; the converter is connected to the high-voltage bypass distribution unit and is connected to the battery through a low-voltage power line; when the battery is in a low-power state, the power battery is configured to supply power to the converter and the battery through the high-voltage bypass distribution unit. According to the control circuit provided in the present application, the power battery, the high-voltage bypass distribution unit, the converter and the battery can be connected, so that the power battery can be used to power the battery. After the battery is powered, it can power on the low-voltage system of the vehicle, so that the vehicle can be restarted, thereby solving the problem that the vehicle cannot be started due to a low-power battery.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a control circuit and a control method for emergency starting of a vehicle and a battery thereof when the vehicle is low on power. Background Art

[0002] At present, the degree of electrification of new energy vehicles is getting higher and higher, which requires more ECUs (Electronic Control Units) to support it, which invisibly increases the static power consumption of new energy vehicles and makes it more likely that the batteries of new energy vehicles will be depleted. When the battery is depleted, the low-voltage system of the vehicle cannot obtain the rated voltage for normal operation, causing the vehicle controller and other devices to fail to work and the vehicle to fail to start normally. In order to solve the problem of battery depletion, most strategies are based on preventing battery depletion. Once the battery is depleted due to an accident, it is still difficult to start the vehicle in an emergency.

[0003] At present, when the battery of a new energy vehicle is exhausted and the vehicle cannot be started, it is generally connected to an external 12V power supply to replenish the battery. However, the safety of this method cannot be guaranteed, and if there is no 12V power supply in an emergency, the user will be helpless and can only ask for help. In addition, if the battery is equipped with a separate ECU, multiple sensors and actuators, etc., so as to supply power to the battery alone, this will increase the possibility of battery exhaustion and increase the cost of the whole vehicle. Summary of the invention

[0004] The present application provides a control circuit and a control method for emergency starting of a vehicle and its battery when the battery is low on power, so as to solve the technical problem that it is difficult to start the vehicle when the battery of the existing vehicle is low on power.

[0005] According to one aspect of the present application, a control circuit for emergency starting of a vehicle battery with low power is provided, comprising a power battery, a converter, a battery and a high-voltage bypass distribution unit; the power battery is connected to the high-voltage bypass distribution unit; the converter is connected to the high-voltage bypass distribution unit and is connected to the battery through a low-voltage power line; when the battery is in a low-power state, the power battery is configured to supply power to the converter and the battery through the high-voltage bypass distribution unit.

[0006] The control circuit for emergency starting of a vehicle battery with low power provided by the present application comprises at least a power battery, a converter, a battery and a high-voltage bypass power distribution unit. When the vehicle battery is low power, by turning on the high-voltage bypass power distribution unit, the power battery is connected to the converter via the high-voltage bypass power distribution unit, and the converter can be powered by the power battery, and then the battery can be powered by the converter. After the battery is powered, the low-voltage system of the vehicle can be powered on, thereby ensuring the normal operation of the low-voltage system of the vehicle, so that the vehicle can be restarted, thereby solving the technical problem that it is difficult to start the vehicle when the existing vehicle battery is low power.

[0007] In a further preferred embodiment, the converter includes a first transformer unit, a second transformer unit and a controller; the first transformer unit is connected to the high-voltage bypass distribution unit and is connected to the battery through a low-voltage power line, the second transformer unit is connected to the high-voltage bypass distribution unit and is connected to the controller through a low-voltage power line, and the controller is signal-connected to the first transformer unit; when the battery is in a power-deficient state, the power battery supplies power to the controller through the high-voltage bypass distribution unit and the second transformer unit, and the controller controls the first transformer unit to be connected to the battery so that the power battery supplies power to the battery through the high-voltage bypass distribution unit and the first transformer unit.

[0008] In this solution, the first transformer unit of the converter is connected to the power battery via the high-voltage bypass distribution unit and connected to the storage battery via the low-voltage power line. The voltage output from the power battery to the storage battery can be reduced by the first transformer unit to ensure that the power battery supplies power to the storage battery safely. In addition, the second transformer unit is connected to the power battery via the high-voltage bypass distribution unit and connected to the storage battery via the low-voltage power line. The voltage output from the power battery to the controller can be reduced by the second transformer unit to ensure that the power battery supplies power to the controller safely. The controller then controls the on-off of the first transformer unit and the storage battery, thereby controlling the on-off between the power battery and the high-voltage bypass distribution unit and the storage battery, thereby improving the controllability and safety of the power battery supplying power to the storage battery via the high-voltage bypass distribution unit.

[0009] In a further preferred embodiment, the high-voltage bypass distribution unit includes a main road, a first branch road and a second branch road, the main road is connected to the power battery, the first branch road is connected to the main road and the first transformer unit, and the second branch road is connected to the main road and the second transformer unit.

[0010] In this solution, the first transformer unit is connected to the power battery through the first branch and the main road, and the second transformer unit is connected to the power battery through the second branch and the main road, that is, the first branch and the first transformer unit are connected to the main road and the power battery in parallel with the second branch and the second transformer unit. Therefore, when the main road is closed, the first branch and the first transformer unit can be powered by the power battery and the second transformer unit can be powered by the second branch at the same time, thereby improving the power supply efficiency, reducing the layout of the lines, and saving the layout space requirements of the high-voltage bypass distribution unit.

[0011] In a further preferred solution, the main line includes a bypass switch, a current limiting resistor and a fuse element, and the bypass switch, the current limiting resistor and the fuse element are connected in series.

[0012] In this solution, the bypass switch can be used to control the on / off of the main line, thereby controlling the on / off between the power battery and the high-voltage bypass distribution unit and the storage battery; the current flowing through the main line can be limited by the current-limiting resistor to prevent the power battery from outputting excessive current and causing damage to the converter and the storage battery; and, when a circuit failure occurs, the high-voltage bypass distribution unit can be automatically disconnected by the fuse element, thereby providing emergency protection for the power battery, the converter and the storage battery.

[0013] In a further preferred embodiment, the first transformer unit includes a first transformer and a switching element; the first transformer is connected to the high-voltage bypass distribution unit through a high-voltage power line and to the battery through a low-voltage power line; the switching element is connected in series with the first transformer and is controlled by the controller.

[0014] In this solution, the controller controls the opening or closing of the switch element to connect or disconnect the high-voltage bypass distribution unit and the first transformer. When the high-voltage bypass distribution unit and the first transformer are connected, the power battery supplies power to the storage battery via the high-voltage bypass distribution unit and the first transformer, and the output voltage of the power battery is stepped down by the first transformer, thereby ensuring safe power supply to the storage battery.

[0015] In a further preferred embodiment, the first transformer unit has a high voltage input end, a high voltage output end, a low voltage input end and a low voltage output end, the high voltage input end is connected to the positive electrode of the power battery through the high voltage bypass distribution unit, the high voltage output end is connected to the negative electrode of the power battery through a high voltage power line, the low voltage input end is connected to the positive electrode of the battery through a low voltage power line, and the low voltage output end is connected to the negative electrode of the battery through a low voltage power line.

[0016] In this solution, the high voltage input terminal and the high voltage output terminal of the first transformer unit are respectively connected to the positive and negative electrodes of the power battery, and the low voltage input terminal and the low voltage output terminal of the first transformer unit are respectively connected to the positive and negative electrodes of the storage battery. Therefore, the high voltage output by the power battery can be stepped down by the first transformer unit, converted into a low voltage acceptable to the storage battery, and then output to the storage battery, thereby supplying power to the storage battery in a low-power state.

[0017] In a further preferred solution, the first branch is provided with a diode, which is used to conduct the current from the high-voltage bypass distribution unit to the high-voltage input end and to cut off the current from the high-voltage input end to the high-voltage bypass distribution unit. By providing the diode, the direction of the current flowing through the first branch can be limited, ensuring that the current from the high-voltage bypass distribution unit flows smoothly to the high-voltage input end of the first transformer unit, while preventing the current at the high-voltage input end of the first transformer unit from flowing back along the first branch, causing circuit failure or danger.

[0018] In a further preferred embodiment, the control circuit further includes a high-voltage main distribution unit, which is connected to the power battery; when the battery is in a normal state, the battery supplies power to the controller, and the controller controls the first transformer unit to be connected to the battery, so that the power battery supplies power to the battery through the high-voltage main distribution unit and the first transformer unit.

[0019] In this solution, the high-voltage main distribution unit is connected to the power battery and the first transformer unit. The high-voltage main distribution unit can distribute the electric energy output by the power battery, so that a part of the distributed electric energy is supplied to the first transformer unit and then to the battery via the first transformer unit, and the other distributed electric energy is supplied to the vehicle's braking system, electric air conditioner and other components, thereby reasonably distributing the electric energy output by the power battery and improving the efficiency of electric energy utilization.

[0020] According to another aspect of the present application, a vehicle is provided, including the above-mentioned control circuit for emergency starting of a battery-low-power vehicle. The vehicle provided by the present application can supply power to a battery in a low-power state through the above-mentioned control circuit, thereby using the battery to power up the vehicle's low-voltage system to ensure that the vehicle can be restarted in an emergency.

[0021] According to another aspect of the present application, a control method for emergency starting of a vehicle battery with low power is provided, which is implemented based on the above-mentioned control circuit for emergency starting of a vehicle battery with low power, and the control method includes: when the battery is in a low power state, controlling the high-voltage bypass distribution unit to be connected to the power battery, and the power battery supplies power to the controller through the high-voltage bypass distribution unit and the second transformer unit, and the controller controls the first transformer unit to be connected to the battery, so that the power battery supplies power to the battery through the high-voltage bypass distribution unit and the first transformer unit; when the conduction time between the high-voltage bypass distribution unit and the power battery meets a preset condition, the high-voltage bypass distribution unit is disconnected from the power battery, so that the power battery supplies power to the battery through the high-voltage main distribution unit.

[0022] According to the control method for emergency starting of a battery failure in a vehicle provided by the present application, when a battery failure occurs, the high-voltage bypass power distribution unit is turned on so that the power battery can supply power to the battery via the high-voltage bypass power distribution unit, thereby solving the problem of insufficient voltage caused by battery failure. Moreover, when the power battery provides sufficient power to the battery via the high-voltage bypass power distribution unit, the battery can work normally. At this time, the high-voltage bypass power distribution unit can be disconnected so that the power battery can continue to supply power to the battery via the high-voltage main power distribution unit. As a result, regardless of whether the battery is deficient in power, the power battery can be used to supply power to the battery stably, thereby ensuring that the vehicle can be started in time, thereby solving the problem that the vehicle cannot be started due to battery failure.

[0023] In summary, the vehicle and its battery low power emergency start control circuit and control method provided by the present application have at least the following beneficial effects:

[0024] When the battery is in a low-power state, the high-voltage bypass distribution unit can be turned on to make the power battery, the high-voltage bypass distribution unit, the converter and the battery conductive, so that the power battery can be used to power the battery. After the battery is powered, it can power the low-voltage system of the vehicle, thereby ensuring the normal operation of the low-voltage system of the vehicle, so that the vehicle can be restarted. Therefore, through the above design, while keeping the original state of the vehicle, only by adding a high-voltage bypass distribution unit to replenish the battery, the problem of being unable to start the vehicle due to low battery power can be solved, and the cost is low and the applicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation or the prior art description. Obviously, the drawings described below are some implementations of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of a control circuit for emergency starting of a vehicle battery failure provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of a trunk road provided in an embodiment of the present application;

[0028] Figure 3 A schematic diagram of a first branch provided in an embodiment of the present application; and

[0029] Figure 4 A schematic diagram of the second branch provided in an embodiment of the present application.

[0030] The reference numerals are as follows:

[0031] 100. Power battery;

[0032] 200, converter; 210, first transformer unit; 211, first transformer; 212, switch element; 220, second transformer unit; 230, controller; a, high voltage input end; b, high voltage output end; c, low voltage input end; d, low voltage output end;

[0033] 300. Battery;

[0034] 400, high-voltage bypass distribution unit; 410, bypass switch; 420, current limiting resistor; 430, fuse element; 440, diode; L, main line; L1, first branch; L2, second branch;

[0035] 500. High voltage main distribution unit. DETAILED DESCRIPTION

[0036] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear to indicate the orientation or position relationship, unless otherwise specified, they are understood to be based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the control circuit or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, if there is a feature defined as "first" or "second", it is only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly include at least one of the defined features. If there is a description of "plurality", the general meaning is to include at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0038] In this application, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and so on should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection, it can be a direct connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0039] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0040] It should be noted that, in this article, battery depletion refers to the situation where the battery voltage or power is insufficient. For example, when the battery power is insufficient, the internal resistance of the battery is too large. At this time, the electrical appliances connected to the battery cannot obtain the rated voltage for normal operation. When operating under low voltage, they may not work properly. For another example, when some electrical appliances connected to the battery fail, resulting in excessive power consumption, the battery power cannot be replenished in time, and the battery cannot provide sufficient power for all electrical appliances.

[0041] The vehicle provided according to the embodiment of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. Specifically, the vehicle of the present application includes a control circuit for emergency starting when the vehicle battery is low, and the control circuit can distribute the electrical energy of the vehicle's power battery to the internal components of the vehicle including the battery. Since the vehicle of the present application adopts a control circuit for emergency starting when the vehicle battery is low, based on the structural design of the control circuit itself, it can supply power to the battery in a low-power state, thereby using the battery to power up the vehicle's low-voltage system to ensure that the vehicle can be restarted in an emergency.

[0042] Figure 1 A schematic diagram of a control circuit for emergency starting of a vehicle battery run-down provided in an embodiment of the present application.

[0043] Please refer to Figure 1 A control circuit for emergency starting of a vehicle battery under power provided in an embodiment of the present application includes at least a power battery 100, a converter 200, a battery 300 and a high-voltage bypass distribution unit 400.

[0044] The power battery 100 is used as a power source for the vehicle to supply power to the internal components of the vehicle including the storage battery 300. The power battery 100 is connected to the high-voltage bypass power distribution unit 400, and the high-voltage bypass power distribution unit 400 is connected to the converter 200.

[0045] The converter 200 is connected to the battery 300 via a low-voltage power line. The converter 200 is used to convert the high voltage from the power battery 100 and the high-voltage bypass distribution unit 400 into a low voltage, and effectively output a fixed voltage to the battery 300 to power the battery 300.

[0046] When the battery 300 is in a power-deficient state, the high-voltage bypass power distribution unit 400 can be turned on to make the power battery 100, the high-voltage bypass power distribution unit 400, the converter 200 and the battery 300 conductive, so that the power battery 100 is used to power the battery 300, and the battery 300 can be powered by the power battery 100. After the battery 300 is powered, it can power the low-voltage system of the vehicle, thereby ensuring the normal operation of the low-voltage system of the vehicle, so that the vehicle can be restarted. Therefore, through the above design, while keeping the original state of the vehicle, only by adding the high-voltage bypass power distribution unit 400 to supplement the battery 300, the problem of being unable to start the vehicle due to power-deficient battery 300 can be solved, and the cost is low and the applicability is strong.

[0047] As a further preferred implementation scheme, based on the above scheme, the specific embodiments of the present application may also include one or more of the following additions or combinations.

[0048] In some optional embodiments, the converter 200 is a direct current-to-direct current converter (DC-DC converter), which can be used to reduce the voltage of the direct current from the power battery 100 and output direct current of a fixed voltage to the battery 300, thereby providing stable power supply to the battery 300.

[0049] In some optional embodiments, the converter 200 includes a first transformer unit 210, a second transformer unit 220, and a controller 230. The first transformer unit 210 is connected to the high-voltage bypass power distribution unit 400 and is connected to the storage battery 300 through a low-voltage power line. The voltage output from the power battery 100 to the storage battery 300 can be reduced by the first transformer unit 210 to ensure that the power battery 100 safely supplies power to the storage battery 300. The second transformer unit 220 is connected to the high-voltage bypass power distribution unit 400 and is connected to the controller 230 through a low-voltage power line. The voltage output from the power battery 100 to the controller 230 can be reduced by the second transformer unit 220 to ensure that the power battery 100 safely supplies power to the controller 230. The controller 230 is signal-connected to the first transformer unit 210 , and the on / off connection between the first transformer unit 210 and the battery 300 can be controlled by the controller 230 . When the first transformer unit 210 and the battery 300 are connected, the power battery 100 can supply power to the battery 300 .

[0050] Specifically, when the storage battery 300 is in a power-deficient state, the power battery 100 supplies power to the controller 230 through the high-voltage bypass power distribution unit 400 and the second transformer unit 220, and then the controller 230 controls the first transformer unit 210 to be connected with the storage battery 300, so that the power battery 100 supplies power to the storage battery 300 through the high-voltage bypass power distribution unit 400 and the first transformer unit 210. Thus, the controller 230 can control the connection and disconnection between the power battery 100 and the high-voltage bypass power distribution unit 400 and the storage battery 300, thereby improving the controllability and safety of the power battery 100 supplying power to the storage battery 300.

[0051] In some optional embodiments, the first voltage transformation unit 210 has a high voltage input terminal a, a high voltage output terminal b, a low voltage input terminal c and a low voltage output terminal d.

[0052] Reference Figure 1 , the high-voltage input terminal a is connected to the positive electrode of the power battery 100 through the high-voltage bypass power distribution unit 400, and the high-voltage output terminal b is connected to the negative electrode of the power battery 100 through the high-voltage power line (HV_DC-). By connecting the high-voltage input terminal a and the high-voltage output terminal b to the positive electrode and the negative electrode of the power battery 100 with a higher output voltage, the first transformer unit 210 can withstand the high voltage from the power battery 100. The low-voltage input terminal c is connected to the positive electrode of the storage battery 300 through the low-voltage power line (LV_DC-), and the low-voltage output terminal d is connected to the negative electrode of the storage battery 300 through the low-voltage power line (LV_DC+). By connecting the low-voltage input terminal c and the low-voltage output terminal d to the positive electrode and the negative electrode of the storage battery 300 respectively, the first transformer unit 210 can output the converted low voltage to the storage battery 300, so as to supply power to the storage battery 300.

[0053] In some optional embodiments, the control circuit further includes a high-voltage main power distribution unit 500 , which is connected to the power battery 100 .

[0054] Refer to Figure 1 , the high-voltage main power distribution unit 500 includes a resistor R and a switch connected in parallel with the first transformer unit 210. It should be understood that the resistor R and the switch in the figure are only exemplary, and the resistor R may refer to any circuit or component connected in parallel with the converter 200, for example, the resistor R may include a high-voltage relay, a high-voltage fuse, etc., which is used to power the in-vehicle components such as the braking system, the electric air conditioner, the drive motor control system, and the battery management system.

[0055] In addition, the high-voltage main distribution unit 500 is connected to the positive electrode and the high-voltage input terminal a of the power battery 100 through the high-voltage power line (HV_DC+), and is connected to the negative electrode and the high-voltage output terminal b of the power battery 100 through the high-voltage power line (HV_DC-). When the storage battery 300 is in a normal state, the storage battery 300 can supply power to the controller 230, and the first transformer unit 210 can be controlled by the controller 230 to be connected with the storage battery 300, so that the power battery 100 supplies power to the storage battery 300 through the high-voltage main distribution unit 500 and the first transformer unit 210. Therefore, the energy distribution of each component connected to the power battery 100 can be coordinated through the high-voltage main distribution unit 500 to improve the efficiency of electric energy utilization. At the same time, the high-voltage main distribution unit 500 can also realize safety protection functions such as rapid power-off protection and leakage protection for short-circuit overload.

[0056] Figure 2 A schematic diagram of a trunk road provided in an embodiment of the present application; Figure 3 A schematic diagram of a first branch provided in an embodiment of the present application; and Figure 4 A schematic diagram of the second branch provided in an embodiment of the present application.

[0057] Reference Figures 2 to 4 In some optional embodiments, the high-voltage bypass distribution unit 400 includes a trunk line L, a first branch line L1, and a second branch line L2. The trunk line L is connected to the power battery 100, the first branch line L1 is connected to the trunk line L and the first transformer unit 210, and the second branch line L2 is connected to the trunk line L and the second transformer unit 220.

[0058] Specifically, one end of the trunk L is connected to the positive electrode of the power battery 100, and the other end is connected to the first branch L1 and the second branch L2 respectively. The first branch L1 is connected to the high-voltage input terminal a of the first transformer unit 210, and the second branch L2 is connected to the second transformer unit 220 and connected to the high-voltage output terminal b, that is, the first branch L1 and the first transformer unit 210 are connected in parallel with the second branch L2 and the second transformer unit 220 to the trunk L and the power battery 100. When the trunk L is closed, the first branch L1 and the first transformer unit 210 can be powered by the power battery 100, and the second branch L2 can be powered by the second transformer unit 220, thereby improving the power supply efficiency, reducing the layout of the lines, and saving the layout space requirement of the high-voltage bypass distribution unit 400.

[0059] In some optional embodiments, the trunk L includes a bypass switch 410, a current limiting resistor 420 and a fuse element 430, and the bypass switch 410, the current limiting resistor 420 and the fuse element 430 are connected in series through a high-voltage power line (HV_bypass). The bypass switch 410 is used to control the on-off of the trunk L, the current limiting resistor 420 is used to limit the impact current generated by the closing of the bypass switch 410, and the fuse element 430, such as a fuse, is used to protect the overload current generated by the closing of the bypass switch 410. Through the above design, the problem of being unable to start the vehicle due to the lack of power in the battery 300 can be solved by adding switches, resistors and other devices with relatively low costs while maintaining the original state of the vehicle, and the safety of the high-voltage bypass distribution unit 400 can be improved.

[0060] Optionally, the bypass switch 410 is a mechanical switch without a self-locking function, and must be manually pressed or released by the user to open or close the bypass switch 410, thereby avoiding the situation where the user forgets to close the bypass switch 410 after opening the bypass switch 410 for a period of time.

[0061] In some optional embodiments, the first branch L1 is provided with a diode 440 , which is used to conduct the current from the high-voltage bypass distribution unit 400 to the high-voltage input terminal a and to block the current from the high-voltage input terminal a to the high-voltage bypass distribution unit 400 .

[0062] When the vehicle is powered on at high voltage, the power battery 100 supplies power to the first transformer unit 210 and the storage battery 300 through the high-voltage main distribution unit 500. The diode 440 on the first branch L1 can prevent the current from being transmitted from the high-voltage input terminal a to the main trunk L or the second branch L2. At this time, the high-voltage bypass distribution unit 400 is isolated from the high-voltage input terminal a to prevent the high-voltage bypass distribution unit 400 from being charged under this working condition and causing safety hazards. When the power battery 100 supplies power to the first transformer unit 210, the second transformer unit 220 and the storage battery 300 through the high-voltage bypass distribution unit 400, the diode 440 can allow the current to be transmitted from the main trunk L to the high-voltage input terminal a, thereby ensuring that the first transformer unit 210 and the storage battery 300 are powered.

[0063] In some optional embodiments, the first transformer unit 210 includes a first transformer 211 and a switch element 212. The first transformer 211 is connected to the high-voltage bypass distribution unit 400 through a high-voltage power line and to the storage battery 300 through a low-voltage power line; the switch element 212 is connected in series with the first transformer 211 and is controlled by the controller 230. The controller 230 controls the opening or closing of the switch element 212 to connect or disconnect the high-voltage bypass distribution unit 400 and the first transformer 211. When the storage battery 300 is low on power, the bypass switch 410 can be pressed to connect the high-voltage bypass distribution unit 400 and the first transformer 211. At this time, the power battery 100 can supply power to the storage battery 300 via the high-voltage bypass distribution unit 400 and the first transformer 211, and the output voltage of the power battery 100 is stepped down by the first transformer 211, thereby ensuring safe power supply to the storage battery 300.

[0064] According to another embodiment of the present application, a control method for emergency starting of a vehicle battery when it is low on power is provided, which is implemented based on the control circuit for emergency starting of a vehicle battery when it is low on power in the above embodiment. The control method in this embodiment includes: when the battery 300 is in a low-power state, controlling the high-voltage bypass distribution unit 400 to be connected with the power battery 100, the power battery 100 supplies power to the controller 230 through the high-voltage bypass distribution unit 400 and the second transformer unit 220, the controller 230 controls the first transformer unit 210 to be connected with the battery 300, so that the power battery 100 supplies power to the battery 300 through the high-voltage bypass distribution unit 400 and the first transformer unit 210. When the conduction time between the high-voltage bypass distribution unit 400 and the power battery 100 meets a preset condition, the high-voltage bypass distribution unit 400 is disconnected from the power battery 100, so that the power battery 100 supplies power to the battery 300 through the high-voltage main distribution unit 500.

[0065] According to the control method for emergency starting of the vehicle battery 300 when it is low on power provided in this embodiment, when the user starts the vehicle, if the vehicle reports that the battery 300 voltage is low and causes a failure to start or there is no prompt on the instrument after starting, it means that the battery 300 is in a low-power state. At this time, the user can press the bypass switch 410 without a self-locking function, so that the power battery 100 forms a high-voltage bypass distribution unit 400 through the bypass switch 410, the current limiting resistor 420, and the insurance element 430. In addition, the power battery 100 is connected to the second transformer unit 220 through the second branch L2 of the high-voltage bypass distribution unit 400, and the controller 230 is supplied with low-voltage power through the second transformer unit 220, and then the switch element 212 is controlled to be closed by the controller 230, so that the power battery 100 can charge the first transformer 211 and the battery 300 through the first branch L1 of the high-voltage bypass distribution unit 400. When the vehicle no longer reports a low battery 300 voltage fault or the user presses the bypass switch 410 for more than a preset time, such as 1 minute (needs to be calibrated), the user can start the vehicle. After the vehicle is READY, the user releases the bypass switch 410, and the emergency vehicle start operation is completed, thereby solving the problem that the vehicle cannot be started due to a low battery 300.

[0066] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A control circuit for emergency starting of a vehicle battery when it runs out of power, characterized in that: It comprises a power battery (100), a converter (200), a storage battery (300) and a high-voltage bypass power distribution unit (400); The power battery (100) is connected to the high-voltage bypass power distribution unit (400); The converter (200) is connected to the high-voltage bypass power distribution unit (400), and is connected to the storage battery (300) via a low-voltage power line; When the storage battery (300) is in a power-deficient state, the power battery (100) is configured to supply power to the converter (200) and the storage battery (300) through the high-voltage bypass power distribution unit (400); The converter (200) comprises a first voltage transformation unit (210), a second voltage transformation unit (220) and a controller (230); The first transformer unit (210) is connected to the high-voltage bypass power distribution unit (400) and is connected to the storage battery (300) via a low-voltage power line; the second transformer unit (220) is connected to the high-voltage bypass power distribution unit (400) and is connected to the controller (230) via a low-voltage power line; and the controller (230) is signal-connected to the first transformer unit (210); When the storage battery (300) is in a power-deficient state, the power battery (100) supplies power to the controller (230) through the high-voltage bypass power distribution unit (400) and the second transformer unit (220), and the controller (230) controls the first transformer unit (210) to be connected to the storage battery (300), so that the power battery (100) supplies power to the storage battery (300) through the high-voltage bypass power distribution unit (400) and the first transformer unit (210).

2. The control circuit for emergency starting of a vehicle battery failure according to claim 1, characterized in that: The high-voltage bypass power distribution unit (400) comprises a main line (L), a first branch line (L1) and a second branch line (L2); the main line (L) is connected to the power battery (100); the first branch line (L1) is connected to the main line (L) and the first transformer unit (210); and the second branch line (L2) is connected to the main line (L) and the second transformer unit (220).

3. The control circuit for emergency starting of a vehicle battery failure according to claim 2, characterized in that: The main line (L) comprises a bypass switch (410), a current limiting resistor (420) and a fuse element (430), and the bypass switch (410), the current limiting resistor (420) and the fuse element (430) are connected in series.

4. The control circuit for emergency starting of a vehicle battery failure according to claim 1, characterized in that: The first voltage transformation unit (210) comprises a first transformer (211) and a switch element (212); The first transformer (211) is connected to the high-voltage bypass power distribution unit (400) via a high-voltage power line, and is connected to the storage battery (300) via a low-voltage power line; The switch element (212) is connected in series with the first transformer (211) and is controlled by the controller (230).

5. The control circuit for emergency starting of a vehicle battery failure according to claim 2, characterized in that: The first voltage transformation unit (210) has a high voltage input terminal (a), a high voltage output terminal (b), a low voltage input terminal (c) and a low voltage output terminal (d); the high voltage input terminal (a) is connected to the positive electrode of the power battery (100) through the high voltage bypass power distribution unit (400); the high voltage output terminal (b) is connected to the negative electrode of the power battery (100) through a high voltage power line; the low voltage input terminal (c) is connected to the positive electrode of the storage battery (300) through a low voltage power line; and the low voltage output terminal (d) is connected to the negative electrode of the storage battery (300) through a low voltage power line.

6. The control circuit for emergency starting of a vehicle battery failure according to claim 5, characterized in that: The first branch (L1) is provided with a diode (440), and the diode (440) is used to conduct the current from the high-voltage bypass distribution unit (400) to the high-voltage input terminal (a) and to cut off the current from the high-voltage input terminal (a) to the high-voltage bypass distribution unit (400).

7. The control circuit for emergency starting of a vehicle battery failure according to any one of claims 1 to 6, characterized in that: The control circuit further comprises a high-voltage main power distribution unit (500), wherein the high-voltage main power distribution unit (500) is connected to the power battery (100); When the storage battery (300) is in a normal state, the storage battery (300) supplies power to the controller (230), and the controller (230) controls the first transformer unit (210) to be connected to the storage battery (300), so that the power battery (100) supplies power to the storage battery (300) through the high-voltage main power distribution unit (500) and the first transformer unit (210).

8. A vehicle, characterized in that: It comprises a control circuit for emergency starting of a vehicle battery when it runs low as described in any one of claims 1 to 7.

9. A control method for emergency starting of a vehicle battery when it is low on power, implemented based on the control circuit for emergency starting of a vehicle battery when it is low on power according to claim 7, characterized in that: The control method comprises: When the storage battery (300) is in a power-deficient state, the high-voltage bypass power distribution unit (400) is controlled to be connected to the power battery (100), the power battery (100) supplies power to the controller (230) through the high-voltage bypass power distribution unit (400) and the second transformer unit (220), and the controller (230) controls the first transformer unit (210) to be connected to the storage battery (300), so that the power battery (100) supplies power to the storage battery (300) through the high-voltage bypass power distribution unit (400) and the first transformer unit (210); When the conduction time between the high-voltage bypass power distribution unit (400) and the power battery (100) meets a preset condition, the high-voltage bypass power distribution unit (400) is disconnected from the power battery (100), so that the power battery (100) supplies power to the storage battery (300) through the high-voltage main power distribution unit (500).

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