Vehicle

Abstract

This utility model discloses a vehicle, comprising: a mother vehicle equipped with a mother vehicle power battery and a mother vehicle power distribution unit, the mother vehicle power battery and the mother vehicle power distribution unit being electrically connected; a daughter vehicle selectively mounted on the mother vehicle, the daughter vehicle equipped with a daughter vehicle power battery and a daughter vehicle power distribution unit, the daughter vehicle power battery and the daughter vehicle power distribution unit being electrically connected; a DC-DC converter mounted on either the mother vehicle or the daughter vehicle; a battery management system; and a main control unit. Thus, by electrically connecting one end of the DC-DC converter to the mother vehicle power distribution unit and the other end of the DC-DC converter to the daughter vehicle power distribution unit, the electrical energy stored in both the mother vehicle power battery and the daughter vehicle power battery can be flexibly allocated between the mother vehicle and the daughter vehicle, enabling energy sharing between them. This, in turn, improves the driving range of either the mother vehicle or the daughter vehicle and reduces the number of charging cycles for both.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a vehicle. Background Technology

[0002] Mother-daughter vehicles are a special type of combined transport, typically consisting of a larger mother vehicle and a smaller daughter vehicle. When both vehicles are fully loaded, they operate normally. When the vehicles are unloaded, the daughter vehicle is usually placed on the mother vehicle. This not only saves costs and improves efficiency, but also reduces overall toll fees and energy consumption, reduces tire wear, and extends tire life.

[0003] Among the relevant technologies, the mother-daughter vehicle transportation mode has limitations such as difficulty in charging, long charging time, many charging times, small battery pack capacity, and short driving range. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a vehicle whose structure allows for power sharing between a mother vehicle and a daughter vehicle, thereby improving the range of either the mother vehicle or the daughter vehicle and reducing the number of times they need to be charged.

[0005] The vehicle according to this utility model includes: a mother vehicle, on which a mother vehicle power battery and a mother vehicle power distribution unit are provided, the mother vehicle power battery and the mother vehicle power distribution unit being electrically connected; a daughter vehicle, selectively disposed on the mother vehicle, the daughter vehicle being disposed on the daughter vehicle power battery and the daughter vehicle power distribution unit being provided, the daughter vehicle power battery and the daughter vehicle power distribution unit being electrically connected; a DC-DC converter, disposed on the mother vehicle or the daughter vehicle, one end of the DC-DC converter being electrically connected to the mother vehicle power distribution unit, and the other end of the DC-DC converter being electrically connected to the daughter vehicle power distribution unit; a battery management system, disposed on the mother vehicle or the daughter vehicle, the battery management system being electrically connected to the mother vehicle power battery and the daughter vehicle power battery respectively; and a main control unit, disposed on the mother vehicle or the daughter vehicle, the main control unit being electrically connected to the battery management system.

[0006] Therefore, by connecting one end of the DC-DC converter to the power distribution unit of the mother vehicle and the other end of the DC-DC converter to the power distribution unit of the daughter vehicle, the electrical energy stored in the power batteries of both the mother vehicle and the daughter vehicle can be flexibly allocated between the mother vehicle and the daughter vehicle, enabling power sharing between them. This, in turn, can improve the range of either the mother vehicle or the daughter vehicle and reduce the number of times they need to be charged.

[0007] In some examples of this utility model, the vehicle further includes a voltage sensor and a current sensor, which are disposed on the mother vehicle or the daughter vehicle to detect the current and voltage between the mother vehicle and the daughter vehicle respectively. Both the current sensor and the voltage sensor are electrically connected to the main control unit.

[0008] In some examples of this utility model, the vehicle further includes an overvoltage / undervoltage protection module, which is installed on the mother vehicle or the daughter vehicle, and is electrically connected to the voltage sensor and the main control unit, respectively.

[0009] In some examples of this utility model, the vehicle further includes a temperature closed-loop control device, which includes a temperature detection element and a control element, the temperature detection element and the control element being electrically connected, and the control element being electrically connected to the main control unit.

[0010] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0011] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial schematic diagram of a vehicle according to an embodiment of the present utility model; Figure 2 This is a partial schematic diagram of a vehicle according to an embodiment of the present utility model; Figure 3 This is a flowchart of a vehicle control method according to an embodiment of the present utility model; Figure 4 This is a flowchart of a vehicle control method according to an embodiment of the present utility model.

[0012] Figure label: 100. Vehicles; 10. Mother vehicle; 101. Mother vehicle power battery; 102. Mother vehicle power distribution unit; 20. Sub-vehicle; 201. Sub-vehicle power battery; 202. Sub-vehicle power distribution unit; 30. DC-DC converter; 40. Battery management system. Detailed Implementation

[0013] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0014] The following is for reference. Figures 1-2 Describes a vehicle 100 according to an embodiment of the present utility model.

[0015] Combination Figure 1 and Figure 2 As shown, the vehicle 100 according to this utility model may mainly include: a mother vehicle 10, a daughter vehicle 20, a DC-DC converter 30, a battery management system 40, and a main control unit.

[0016] The mother vehicle 10 is equipped with a mother vehicle power battery 101 and a mother vehicle power distribution unit 102, which are electrically connected. Specifically, the mother vehicle power battery 101 can store and release electrical energy to ensure the normal operation and range of the mother vehicle 10. By electrically connecting the mother vehicle power battery 101 and the mother vehicle power distribution unit 102, the electrical energy in the mother vehicle power battery 101 can be effectively transferred to the electric drive system of the mother vehicle 10, thereby ensuring the safe and stable operation of the mother vehicle 10.

[0017] Furthermore, the subsidiary vehicle 20 is selectively mounted on the parent vehicle 10. When both the subsidiary vehicle 20 and the parent vehicle 10 are fully loaded, they operate normally. When both are empty, the subsidiary vehicle 20 is typically mounted on the parent vehicle 10. This not only reduces the overall frontal area of ​​both vehicles, thus lowering their energy consumption, but also reduces highway tolls, saving on overall transportation costs. It should be noted that when the subsidiary vehicle 20 is carrying cargo and the parent vehicle 10 is empty, if the weight of the subsidiary vehicle 20 and the weight of its cargo meet the load requirements of the parent vehicle 10, the cargo-laden subsidiary vehicle 20 can also be mounted on the empty parent vehicle 10.

[0018] Furthermore, the vehicle 20 is equipped with a vehicle power battery 201 and a vehicle power distribution unit 202, which are electrically connected. Specifically, the vehicle power battery 201 can store and release electrical energy to ensure the normal operation and range of the vehicle 20. By electrically connecting the vehicle power battery 201 and the vehicle power distribution unit 202, the electrical energy in the vehicle power battery 201 can be effectively transferred to the electric drive system of the vehicle 20, thereby ensuring the safe and stable operation of the vehicle 20.

[0019] Furthermore, a DC-DC converter 30 is installed on the mother vehicle 10 or the daughter vehicle 20. One end of the DC-DC converter 30 is electrically connected to the mother vehicle power distribution unit 102, and the other end is electrically connected to the daughter vehicle power distribution unit 202. In this way, the output voltage of the mother vehicle 10 or the daughter vehicle 20 can be adjusted by the DC-DC converter 30 to make the output voltage of the mother vehicle power battery 101 and the daughter vehicle power battery 201 the same, so as to prevent short circuits between the mother vehicle power battery 101 and the daughter vehicle power battery 201 from causing damage or performance degradation to either the mother vehicle power battery 101 or the daughter vehicle power battery 201. Thus, the mother vehicle power battery 101 can supplement the daughter vehicle power battery 201 with power, or the daughter vehicle power battery 201 can supplement the mother vehicle power battery 101 with power, so that the mother vehicle 10 and the daughter vehicle 20 can share power. Specifically, when the power battery 201 of the subsidiary vehicle is low on power, it can be replenished by the power battery 101 of the parent vehicle, thereby extending the driving range of the subsidiary vehicle 20, reducing the distance the subsidiary vehicle 20 travels to find charging stations and the number of times it needs to go to charging stations during transportation, improving the transportation efficiency of the subsidiary vehicle 20, and reducing the possibility of mission interruption due to insufficient power of the subsidiary vehicle power battery 201. Similarly, when the power battery 101 of the parent vehicle is low on power, it can be replenished by the power battery 201 of the subsidiary vehicle, thereby extending the driving range of the parent vehicle 10, reducing the distance the parent vehicle 10 travels to find charging stations and the number of times it needs to go to charging stations during transportation, improving the transportation efficiency of the parent vehicle 10, and reducing the possibility of mission interruption due to insufficient power of the parent vehicle power battery 101. This configuration allows for flexible allocation of electrical energy between the mother vehicle 10 and the daughter vehicle 20, avoiding the problem of one battery being overused while the other is underutilized. It enables efficient utilization of the electrical energy stored in both the mother vehicle 10 and the daughter vehicle 20.

[0020] Furthermore, the battery management system 40 is installed on the mother vehicle 10 or the daughter vehicle 20. The battery management system 40 is electrically connected to the mother vehicle power battery 101 and the daughter vehicle power battery 201, respectively. In this way, the battery management system 40 can monitor parameters such as the aging degree, maximum capacity and remaining power of the mother vehicle power battery 101 and the daughter vehicle power battery 201 in real time, so as to allocate and use the electrical energy stored in the mother vehicle power battery 101 and the daughter vehicle power battery 201 between the mother vehicle 10 and the daughter vehicle 20 based on these parameters.

[0021] Furthermore, the main control unit is installed on the mother vehicle 10 or the daughter vehicle 20, and is electrically connected to the battery management system 40. This allows the main control unit to not only control the current direction between the daughter vehicle 20 and the mother vehicle 10, control the opening and closing of the electrical connection between the daughter vehicle 20 and the mother vehicle 10, and control the charging and discharging states of the mother vehicle power battery 101 and the daughter vehicle power battery 201, but also to control the DC-DC converter 30 to regulate the output voltage of the mother vehicle power battery 101 or the daughter vehicle power battery 201, so that the output voltage of the mother vehicle power battery 101 and the daughter vehicle power battery 201 are the same, thereby ensuring the normal flow of current between the daughter vehicle 20 and the mother vehicle 10 and enabling energy sharing between the daughter vehicle 20 and the mother vehicle 10.

[0022] Therefore, by electrically connecting one end of the DC-DC converter 30 to the mother vehicle power distribution unit 102 and the other end of the DC-DC converter 30 to the daughter vehicle power distribution unit 202, the output voltages of the mother vehicle power battery 101 and the daughter vehicle power battery 201 can be the same. This allows the electrical energy stored in the mother vehicle power battery 101 and the daughter vehicle power battery 201 to be flexibly allocated between the mother vehicle 10 and the daughter vehicle 20, enabling power sharing between the mother vehicle 10 and the daughter vehicle 20. This, in turn, can improve the range of the mother vehicle 10 or the daughter vehicle 20 and reduce the number of times the mother vehicle 10 and the daughter vehicle 20 need to be charged.

[0023] In some specific embodiments of this utility model, one end of the DC-DC converter 30 is electrically connected to the relay group of the main vehicle power distribution unit 102, so as to control the opening and closing of the electrical connection path between the main vehicle power distribution unit 102 and the DC-DC converter 30 through the corresponding relay group, and the other end is electrically connected to the relay group of the sub-vehicle power distribution unit 202, so as to control the opening and closing of the electrical connection path between the sub-vehicle power distribution unit 202 and the DC-DC converter 30 through the corresponding relay group.

[0024] Combination Figure 1 and Figure 2As shown, vehicle 100 also includes a voltage sensor and a current sensor, which are installed on either the mother vehicle 10 or the daughter vehicle 20 to detect the current and voltage between the mother vehicle 10 and the daughter vehicle 20 respectively. Both the current sensor and the voltage sensor are electrically connected to the main control unit. Specifically, by installing the current sensor and the voltage sensor on either the mother vehicle 10 or the daughter vehicle 20 to detect the current and voltage between the mother vehicle 10 and the daughter vehicle 20 respectively, it is possible to monitor whether the current and voltage between the mother vehicle 10 and the daughter vehicle 20 are within a safe range, thereby ensuring the normal operation of the power battery and electric drive system of the mother vehicle 10 and the daughter vehicle 20. Furthermore, both the current sensor and the voltage sensor are electrically connected to the main control unit. This allows the data detected by the current sensor and the voltage sensor to be transmitted to the main control unit. The main control unit can then adjust the operating status of the power battery 101 and the power battery 201 of the mother car and the daughter car in real time based on the data detected by the current sensor and the required current flow between the mother car 10 and the daughter car 20. In the event of abnormal current or voltage between the mother car 10 and the daughter car 20, the main control unit can promptly cut off the current path between the daughter car 20 and the mother car 10 to prevent damage to the power battery 101 and the power battery 201 of the mother car and the daughter car 20 due to abnormal current or voltage between the mother car 10 and the daughter car 20.

[0025] In some embodiments of this utility model, the output current and output voltage of the mother vehicle power battery 101 and the output current and output voltage of the daughter vehicle power battery 201 can be detected. If the DC-DC converter 30 is installed on the mother vehicle 10 side and the DC-DC converter 30 has built-in current and voltage detection functions, then only current sensors and voltage sensors need to be set on the daughter vehicle 20 side to realize the detection of current and voltage on the mother vehicle 10 side and the daughter vehicle 20 side, so as to improve the reliability and safety of the current path between the daughter vehicle 20 and the mother vehicle 10 during operation.

[0026] In some other embodiments of this utility model, the output current and output voltage of the mother vehicle power battery 101 and the output current and output voltage of the daughter vehicle power battery 201 can be detected. If the DC-DC converter 30 is installed on the daughter vehicle 20 side and the DC-DC converter 30 has built-in current and voltage detection functions, then only current sensors and voltage sensors need to be set on the mother vehicle 10 side to realize the detection of current and voltage on the mother vehicle 10 side and the daughter vehicle 20 side, so as to improve the reliability and safety of the current path between the daughter vehicle 20 and the mother vehicle 10 when it is working.

[0027] In some embodiments of this utility model, the output current and voltage of the mother vehicle power battery 101 and the output current and voltage of the daughter vehicle power battery 201 can be detected. If the DC-DC converter 30 does not have current and voltage detection functions, current sensors and voltage sensors need to be provided on both the mother vehicle 10 side and the daughter vehicle 20 side to detect the current and voltage on the mother vehicle 10 side and the daughter vehicle 20 side, so as to improve the reliability and safety of the current path between the daughter vehicle 20 and the mother vehicle 10 during operation.

[0028] Combination Figure 1 and Figure 2 As shown, vehicle 100 also includes an overvoltage / undervoltage protection module, which is installed on either the mother vehicle 10 or the daughter vehicle 20. The overvoltage / undervoltage protection module is electrically connected to both a voltage sensor and the main control unit. Specifically, by installing the overvoltage / undervoltage protection module on either the mother vehicle 10 or the daughter vehicle 20, the voltage in the current path between the mother vehicle 10 and the daughter vehicle 20 can be monitored in real time to ensure the normal operation of the current path between them. Furthermore, by electrically connecting the overvoltage / undervoltage protection module to both the voltage sensor and the main control unit, the voltage signal detected by the voltage sensor can be transmitted to the overvoltage / undervoltage protection module. The overvoltage / undervoltage protection module then transmits relevant signals to the main control unit based on the received voltage signal, thereby achieving on / off control of the current path between the mother vehicle 10 and the daughter vehicle 20 through the coordinated operation of the main control unit. This configuration not only cuts off the current path between the mother car 10 and the daughter car 20 when the voltage detected by the voltage sensor exceeds the maximum preset threshold, preventing damage to some equipment in the daughter car 20 or mother car 10 due to excessive voltage, but also cuts off the current path between the mother car 10 and the daughter car 20 when the voltage detected by the voltage sensor is lower than the minimum preset threshold, preventing the current path between the mother car 10 and the daughter car 20 from being in an unstable working state, and preventing performance degradation or starting difficulties in equipment such as the mother car 10 power battery or the daughter car power battery 201.

[0029] Combination Figure 1 and Figure 2As shown, the vehicle 100 also includes a temperature closed-loop control device, which includes a temperature detection element and a control element. The temperature detection element and the control element are electrically connected, and the control element is electrically connected to the main control unit. Specifically, by setting up a temperature closed-loop control device, the temperature of the DC-DC converter 30 can be detected in real time by the temperature detection element of the temperature closed-loop control device. Then, when the temperature of the DC-DC converter 30 exceeds the normal temperature range, the control element of the temperature closed-loop control device can adjust the power of the heating or cooling equipment according to the difference between the actual temperature of the DC-DC converter 30 and the preset temperature value, so as to change the temperature of the DC-DC converter 30 and bring the temperature of the DC-DC converter 30 back to the normal temperature range. This can achieve precise control of the temperature of the DC-DC converter 30, which can help ensure the normal working state of the DC-DC converter 30 and prevent the performance of the DC-DC converter 30 from deteriorating or being damaged due to abnormal temperature.

[0030] In some embodiments of this utility model, the temperature of the mother vehicle power battery 101 and / or the daughter vehicle power battery 201 can also be controlled by setting a temperature closed-loop control device.

[0031] The following is for reference. Figures 3-4 A control method for a vehicle 100 according to an embodiment of the present invention is described.

[0032] Combination Figure 3 and Figure 4 As shown, the control method of vehicle 100 according to the embodiment of this utility model is applicable to the vehicle 100 described above, and includes the following steps: sampling the output voltage V1 of the main vehicle and the output voltage V2 of the secondary vehicle at a preset period; calculating the voltage deviation between V1 and V2; outputting the duty cycle adjustment amount through the proportional-integral controller; driving the DC-DC converter 30 to adjust the output voltage V2 of the secondary vehicle according to the duty cycle adjustment amount, so that the output voltage V2 of the secondary vehicle dynamically follows the output voltage V1 of the main vehicle.

[0033] First, the output voltage V1 of the mother vehicle and the output voltage V2 of the daughter vehicle are sampled at a preset period. The mother vehicle output voltage V1 refers to the output voltage of the mother vehicle's power battery 101, and the daughter vehicle output voltage V2 refers to the output voltage of the daughter vehicle's power battery 201. In some embodiments of this invention, the data acquisition of the mother vehicle output voltage V1 and the daughter vehicle output voltage V2 can be achieved through a voltage sensor or a DC-DC converter 30 with built-in voltage detection function.

[0034] Secondly, calculate the difference between the mother car's output voltage V1 and the daughter car's output voltage V2. This determines the direction of adjustment for either the mother car's output voltage V1 or the daughter car's output voltage V2, which can be either voltage increase or decrease. For example, if the mother car's output voltage V1 is 500V and the corresponding daughter car's output voltage V2 is 480V, then the deviation between V1 and V2 is 20V. If the daughter car's output voltage V2 needs to be the same as the mother car's output voltage V1, then it can be determined that the daughter car's output voltage V2 should be increased.

[0035] Then, the duty cycle adjustment amount is output by the proportional-integral controller to drive the DC-DC converter 30 to adjust the slave car output voltage V2 according to the duty cycle adjustment amount, so that the slave car output voltage V2 dynamically follows the mother car output voltage V1. This not only allows the slave car output voltage V2 to respond quickly to system deviations, but also eliminates the residual error between the actual value and the target value of the slave car output voltage V2. In this way, not only can the slave car output voltage V2 be the same as the mother car output voltage V1, but the stability of the slave car output voltage V2 can also be ensured.

[0036] Therefore, through the steps described above, the output voltage V2 of the slave vehicle can be made the same as the output voltage V1 of the mother vehicle, thereby allowing the output current of the slave vehicle 20 to flow towards the mother vehicle 10, enabling the slave vehicle power battery 201 to provide power to the mother vehicle 10. It should be noted that the above steps are illustrated using the example of the slave vehicle power battery 201 providing power to the mother vehicle 10, but not only can the slave vehicle power battery 201 provide power to the mother vehicle 10, but the mother vehicle power battery 101 can also provide power to the slave vehicle 20.

[0037] Combination Figure 3 and Figure 4 As shown, the control method of vehicle 100 further includes the following steps: obtaining the ratio a of the current stored charge of the mother vehicle power battery 101 to its maximum capacity; obtaining the ratio b of the current stored charge of the daughter vehicle power battery 201 to its maximum capacity; comparing a and b; when a > b + a first preset percentage value, the DC-DC converter 30 controls the mother vehicle power battery 101 to supply power to the daughter vehicle power battery 201.

[0038] Specifically, when a > b + the first preset percentage value, it is determined that the remaining power of the mother vehicle power battery 101 is still relatively sufficient, and the mother vehicle power battery 101 will provide power first. If the daughter vehicle 20 is placed on the mother vehicle 10 and idle, the mother vehicle power battery 101 will only provide power to the electric drive system of the mother vehicle 10. If the daughter vehicle power battery 201 has insufficient power and the daughter vehicle power battery 201 has a charging requirement, the mother vehicle power battery 101 can be controlled by the DC-DC converter 30 to supply power to the daughter vehicle power battery 201 to replenish the power of the daughter vehicle power battery 201.

[0039] Combination Figure 3 and Figure 4 As shown, the step of comparing a and b further includes: when a≤b+first preset percentage value, DC-DC converter 30 controls the sub-vehicle power battery 201 to supply power to the mother vehicle power battery 101 at full power.

[0040] Specifically, when a≤b+first preset percentage value, a portion of the power of the mother vehicle power battery 101 is consumed. If the daughter vehicle power battery 201 has no charging requirement at this time, the DC-DC converter 30 can control the daughter vehicle power battery 201 to supply power to the mother vehicle power battery 101 at full power, so that the mother vehicle power battery 101 and the daughter vehicle power battery 201 can jointly provide power for the operation of the mother vehicle 10. This can avoid the problem of the mother vehicle power battery 101 being overused and the daughter vehicle power battery 201 having low utilization. This can not only extend the service life of the mother vehicle power battery 101, but also improve the utilization rate of the electrical energy stored in the daughter vehicle power battery 201, thereby improving the range of the mother vehicle 10.

[0041] Combination Figure 3 and Figure 4 As shown, the step of comparing a and b further includes: when b < the second preset percentage value, the connection between the mother vehicle power battery 101 and the daughter vehicle power battery 201 is disconnected.

[0042] Specifically, when b < the second preset percentage value, it is determined that the power of the sub-vehicle power battery 201 is low, and the protection mode of the sub-vehicle power battery 201 needs to be activated. At this time, the connection between the main vehicle power battery 101 and the sub-vehicle power battery 201 needs to be disconnected, so that the sub-vehicle power battery 201 stops supplying power to the main vehicle power battery 101. This can improve the range of the main vehicle 10 while preventing the sub-vehicle power battery 201 from being overused and causing its performance to decline, thus extending the service life of the sub-vehicle power battery 201.

[0043] The specific values ​​of the second preset percentage value and the first preset percentage value can be set according to the specific performance and range requirements of the mother vehicle power battery 101 and the daughter vehicle power battery 201.

[0044] Combination Figure 3 and Figure 4 As shown, the memory according to this invention stores a computer program, which, when executed, implements the aforementioned control method for the vehicle 100. Specifically, the memory is the core component for storing data and computer programs. The control logic of the aforementioned control method for the vehicle 100 is converted into control program code and stored in the memory. Thus, the computer program stored in the memory can be called according to the output voltage and remaining capacity of the mother vehicle power battery 101 and the daughter vehicle power battery 201, thereby implementing the aforementioned control method for the vehicle 100.

[0045] Combination Figure 3 and Figure 4 As shown, according to the processor of this utility model, the processor is communicatively connected to the aforementioned memory, and the computer program in the memory can be executed on the processor. Specifically, by making the processor communicatively connected to the memory, the processor can read the computer program stored in the memory, thereby enabling the computer program stored in the memory to be executed on the processor, so as to realize the aforementioned vehicle 100 control method through the cooperative work of the memory and the processor.

[0046] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle characterized by comprising: include: The mother vehicle (10) is provided with a mother vehicle power battery (101) and a mother vehicle power distribution unit (102), and the mother vehicle power battery (101) and the mother vehicle power distribution unit (102) are electrically connected. Sub-vehicle (20), the sub-vehicle (20) is selectively mounted on the mother vehicle (10), the sub-vehicle (20) is provided with a sub-vehicle power battery (201) and a sub-vehicle power distribution unit (202), the sub-vehicle power battery (201) and the sub-vehicle power distribution unit (202) are electrically connected; DC-DC converter (30), the DC-DC converter (30) is disposed on the mother vehicle (10) or the daughter vehicle (20), one end of the DC-DC converter (30) is electrically connected to the mother vehicle power distribution unit (102), and the other end of the DC-DC converter (30) is electrically connected to the daughter vehicle power distribution unit (202); A battery management system (40) is installed on the mother vehicle (10) or the daughter vehicle (20), and the battery management system (40) is electrically connected to the power battery (101) of the mother vehicle and the power battery (201) of the daughter vehicle respectively. The main control unit is located on the mother vehicle (10) or the daughter vehicle (20) and is electrically connected to the battery management system (40).

2. The vehicle of claim 1, wherein It also includes a voltage sensor and a current sensor, which are disposed on the mother car (10) or the daughter car (20) to detect the current and voltage between the mother car (10) and the daughter car (20) respectively. Both the current sensor and the voltage sensor are electrically connected to the main control unit.

3. The vehicle according to claim 2, characterized in that, It also includes an overvoltage / undervoltage protection module, which is installed on the mother car (10) or the daughter car (20), and is electrically connected to the voltage sensor and the main control unit respectively.

4. The vehicle according to claim 1, characterized in that, It also includes a temperature closed-loop control device, which includes a temperature detection element and a control element, the temperature detection element and the control element being electrically connected, and the control element being electrically connected to the main control unit.

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