Trailer energy storage vehicle and energy storage system

Abstract

The invention discloses a trailer energy storage vehicle and an energy storage system. The trailer energy storage vehicle comprises a vehicle body, a first battery, a detection module, a control device and a first interface, the first battery and the control device are arranged on the vehicle body; the detection module is used for detecting movement of the vehicle body to obtain a detection signal; the first interface is used for power transmission between the first battery and the outside; and the control device is electrically connected with the detection module and is used for acquiring the detection signal, determining the vehicle state based on the detection signal and disconnecting the electric connection between the first battery and the first interface when the vehicle state is a starting state. Through adoption of the scheme, the problem of relatively large potential safety hazards during charging is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a trailer energy storage vehicle and an energy storage system. Background Art

[0002] The trailer energy storage vehicle can be towed by the front vehicle to other places and used in off-grid power scenarios to supply power to loads. The vehicle used for towing is usually an electric vehicle or a hybrid vehicle, which has a limited mileage due to the limited battery capacity. At this time, the trailer energy storage vehicle can use the stored energy to supplement the insufficient power of the front towing vehicle and increase the mileage of the front towing vehicle.

[0003] In addition, when the towing vehicle in front of the trailer energy storage vehicle is charging, the battery of the trailer energy storage vehicle can also be quickly charged for load power supply. At the same time, the trailer energy storage vehicle is equipped with photovoltaic panels on the top, which can charge the battery of the trailer energy storage vehicle at the same time, solving the problem that the towing vehicle cannot drive when the battery of the trailer energy storage vehicle is completely exhausted. Summary of the invention

[0004] The present invention provides a trailer energy storage vehicle and an energy storage system to solve the problem of great potential safety hazards during charging.

[0005] According to one aspect of the present invention, there is provided a trailer energy storage vehicle, the trailer energy storage vehicle comprising: a vehicle body, a first battery, a detection module, a control device and a first interface;

[0006] The first battery and the control device are both arranged on the vehicle body;

[0007] The detection module is used to detect the movement of the vehicle body to obtain a detection signal;

[0008] The first interface is used for transmitting electric energy between the first battery and the outside;

[0009] The control device is electrically connected to the detection module, and is used to: obtain the detection signal, determine the vehicle state based on the detection signal, and when the vehicle state is a start-up state, disconnect the electrical connection between the first battery and the first interface.

[0010] In an optional embodiment of the present invention, the detection module includes a vibration switch, and the vibration switch is used to detect the vibration of the vehicle body to output a vibration detection signal when the vehicle body is vibrating;

[0011] The control device is used to determine that the vehicle state is a start state when the vibration detection signal is acquired.

[0012] In an optional embodiment of the present invention, the vibration switch includes a housing, a first rolling ball, a second rolling ball, a first contact, a second contact, a first connecting member, and a second connecting member;

[0013] The first contact is electrically connected to the first input terminal of the control device through the first connection member, and the second contact is electrically connected to the second input terminal of the control device through the second connection member;

[0014] The first rolling ball and the second rolling ball are arranged in the housing, and the first rolling ball and the second rolling ball are used to contact the first contact and the second contact respectively when vibration is detected, so as to electrically connect the first connecting member and the second connecting member.

[0015] In an optional embodiment of the present invention, the detection module includes a rotation speed sensor, which is used to detect the rotation speed of the vehicle body and output a rotation speed detection signal when the vehicle body moves;

[0016] The control device is used to determine that the vehicle state is a start state when the rotation speed detection signal is acquired.

[0017] In an optional embodiment of the present invention, the control device includes a bidirectional DC / DC converter.

[0018] In an optional embodiment of the present invention, the bidirectional DC / DC converter includes a buck-boost module and a control module, a first end of the buck-boost module is electrically connected to the first battery, a second end of the buck-boost module is used to be electrically connected to the first interface, and a third end of the buck-boost module is electrically connected to the control module;

[0019] The control module is used to control the buck-boost module to stop working when the vehicle is in the start-up state.

[0020] In an optional embodiment of the present invention, when the vehicle is in a stationary state, a power replenishment signal sent when the traction vehicle is not in an external charging state and the power of the traction vehicle is less than a first preset power is obtained, and the buck-boost module is controlled to be in a discharge mode based on the power replenishment signal to charge the traction vehicle, and / or;

[0021] The control module is also used for: when the vehicle is in a stationary state, obtaining a charging signal sent when the traction vehicle is in an external charging state and the power of the traction vehicle is greater than a third preset power, and controlling the buck-boost module to be in a charging mode based on the charging signal to charge the first battery.

[0022] In an optional embodiment of the present invention, the control module is further used for:

[0023] When the buck-boost module is in the discharge mode, when the power of the first battery is 0 or the power of the traction vehicle is greater than a second preset power, the buck-boost module is controlled to stop working.

[0024] In an optional embodiment of the present invention, the trailer energy storage vehicle further includes an inverter, the inverter is electrically connected to the first battery, and / or;

[0025] The trailer energy storage vehicle also includes an MPPT module and a solar cell, wherein the solar cell is electrically connected to an input end of the MPPT module, and an output end of the MPPT module is electrically connected to the first battery.

[0026] According to another aspect of the present invention, there is provided an energy storage system, which includes a traction vehicle and the trailer energy storage vehicle according to any embodiment of the present invention.

[0027] The technical solution of the embodiment of the present invention is to detect the movement of the vehicle body by setting a detection module to obtain a detection signal, then obtain the detection signal through a control device, determine the vehicle state based on the detection signal, and when the vehicle state is in the start state, disconnect the electrical connection between the first battery and the first interface to disconnect the power transmission between the first battery and the traction vehicle. In this way, it is possible to stop charging the traction vehicle when the trailer energy storage vehicle is moving, avoid excessive heating of the first interface and the second interface when the trailer energy storage vehicle and the traction vehicle are connected due to poor contact caused by vibration, causing safety problems, and solve the problem of major safety hazards during charging.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a circuit block diagram of a towing vehicle connected to a towing energy storage vehicle provided in accordance with the first embodiment of the present invention;

[0031] Figure 2 yes Figure 1 Schematic diagram of the connection between the control device and the detection module;

[0032] Figure 3 yes Figure 2 Schematic diagram of the structure of the vibration switch;

[0033] Figure 4 is a circuit block diagram of another towing vehicle connected to a towing energy storage vehicle provided according to the first embodiment of the present invention;

[0034] Figure 5 is a circuit block diagram of another towing vehicle connected to a towing energy storage vehicle provided according to the first embodiment of the present invention;

[0035] Figure 6 It is a circuit block diagram of an energy storage system provided according to the second embodiment of the present invention.

[0036] Among them: 1. trailer energy storage vehicle; 11. inverter; 12. first battery; 13. detection module; 131. vibration switch; 1311. housing; 1312. first ball; 1313. second ball; 1314. first contact; 1315. second contact; 1316. first connector; 1317. second connector; 132. speed sensor; 14. control device; 141. bidirectional DC / DC converter; 1411. buck-boost module; 1412. control module; 15. MPPT module; 2. traction vehicle; 21. second battery; 22. on-board charging system; 23. charging seat; 3. second interface; 4. first interface. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] Embodiment 1

[0040] like Figure 1As shown, the first embodiment of the present invention provides a trailer energy storage vehicle 1, which can be towed to other places by a traction vehicle 2 and used in off-grid power scenarios to supply power to loads. The traction vehicle 2 is usually an electric vehicle or a hybrid vehicle.

[0041] The trailer energy storage vehicle 1 includes a vehicle body, a first battery 12, a detection module 13, a control device 14 and a first interface 4; the first interface 4 is used for the first battery 12 to transmit power to the outside; specifically, the traction vehicle 2 is provided with a second interface 3, and during traction, the first interface 4 of the trailer energy storage vehicle 1 is electrically connected to the second interface 3 of the traction vehicle 2, so that the first battery 12 can transmit power to the traction vehicle 2. Specifically, the first interface 4 and the second interface 3 are trailer interfaces.

[0042] The first battery 12 and the control device 14 are both arranged on the vehicle body; wherein the vehicle body is the main part of the trailer energy storage vehicle 1. The first battery 12 is a device for energy storage in the trailer energy storage vehicle 1. When the power of the traction vehicle 2 is insufficient, the first interface 4 and the second interface 3 can be electrically connected. At this time, the trailer energy storage vehicle 1 can output the power of the first battery 12 to the traction vehicle 2 to supplement the power of the traction vehicle 2 and increase the mileage of the traction vehicle 2.

[0043] The detection module 13 is used to detect the movement of the vehicle body to obtain a detection signal; wherein, the detection module 13 refers to a module that can detect whether the vehicle body is moving, and the detection signal refers to an electrical signal that can reflect whether the vehicle body is moving. Since the trailer energy storage vehicle 1 is towed by the traction vehicle 2, the movement of the trailer energy storage vehicle 1 and the traction vehicle 2 is the same. When the traction vehicle 2 is in the starting state, the trailer energy storage vehicle 1 will move under the traction of the traction vehicle 2 to enter the starting state. When the traction vehicle 2 is in a stationary state, the trailer energy storage vehicle 1 is also in a stationary state. Therefore, the detection module 13 can be set on the vehicle body to detect whether the vehicle body is moving, and can also be set on the traction vehicle 2 to detect whether the vehicle body is moving.

[0044] The control device 14 is electrically connected to the detection module 13, and the control device 14 is used to: obtain a detection signal, determine the vehicle state based on the detection signal, and when the vehicle state is a startup state, disconnect the electrical connection between the first battery 12 and the first interface 4. Among them, the vehicle state includes a startup state and a static state. In the startup state, the trailer energy storage vehicle 1 is moving, and the trailer energy storage vehicle 1 is vibrating at this time. In the static state, the trailer energy storage vehicle 1 is not moving, and there is no vibration in the trailer energy storage vehicle 1. Since the detection signal refers to an electrical signal that can reflect whether the vehicle body is moving, the vehicle state can be determined based on the detection signal. When the vehicle state is a startup state, it means that the trailer energy storage vehicle 1 is moving. At this time, the electrical connection between the first battery 12 and the first interface 4 is disconnected, that is, the power transmission between the first battery 12 and the traction vehicle 2 is disconnected, and the first battery 12 does not output power to the traction vehicle 2, and stops charging the traction vehicle 2, which can ensure safety.

[0045] In the above scheme, the detection module 13 is set to detect the movement of the vehicle body to obtain a detection signal, and then the detection signal is obtained by the control device 14, and the vehicle state is determined based on the detection signal. When the vehicle state is in the start state, the electrical connection between the first battery 12 and the first interface 4 is disconnected to disconnect the power transmission between the first battery 12 and the traction vehicle 2. In this way, it is possible to stop charging the traction vehicle 2 when the trailer energy storage vehicle 1 is moving, avoiding the first interface 4 and the second interface 3 from heating up too much when the trailer energy storage vehicle 1 and the traction vehicle 2 are connected due to poor contact caused by vibration, causing safety problems, and solving the problem of large safety hazards during charging.

[0046] In an optional embodiment of the present invention, Figure 2 As shown, the detection module 13 includes a vibration switch 131, which is used to detect the vibration of the vehicle body and output a vibration detection signal when the vehicle body is vibrating; the control device 14 is used to: when the vibration detection signal is obtained, determine that the vehicle state is the start state. Among them, the vibration switch 131 is an electronic switch that senses the magnitude of the vibration force and transmits the sensing result to the circuit device, and starts the circuit to work. The vibration detection signal refers to the electrical signal output by the vibration switch 131 when it detects the vibration. Therefore, the vibration switch 131 can detect the magnitude of the vibration force of the vehicle body. When the vehicle body is in the start state, the vehicle body moves, and there will be vibration when the vehicle body moves, so that the vibration switch 131 detects the vibration of the vehicle body and outputs a vibration detection signal. Since the vibration detection signal is output by the vibration switch 131 when the vibration is detected, when the control device 14 obtains the vibration detection signal, it can determine that the vehicle state is the start state. Through the above scheme, the vehicle state can be conveniently detected.

[0047] Based on the above embodiments, Figure 2 and Figure 3 As shown, the vibration switch 131 includes a shell 1311, a first ball 1312, a second ball 1313, a first contact 1314, a second contact 1315, a first connecting piece 1316 and a second connecting piece 1317; the first contact 1314 is electrically connected to the first input end of the control device 14 through the first connecting piece 1316, and the second contact 1315 is electrically connected to the second input end of the control device 14 through the second connecting piece 1317; the first ball 1312 and the second ball 1313 are arranged in the shell 1311, and the first ball 1312 and the second ball 1313 are used to contact the first contact 1314 and the second contact 1315 respectively when detecting vibration, so as to electrically connect the first connecting piece 1316 and the second connecting piece 1317.

[0048] The housing 1311 may be a metal housing 1311, and the first contact 1314 and the second contact 1315 are both located in the housing 1311 and close to the two ends of the housing 1311. When the trailer energy storage vehicle 1 is in a stationary state, the first ball 1312 and the second ball 1313 stop in the housing 1311, and the first connector 1316 and the second connector 1317 are in a normally open state. When the trailer energy storage vehicle 1 is in a starting state, the trailer energy storage vehicle 1 vibrates, and at this time, the first ball 1312 and the second ball 1313 slide and contact the first contact 1314 and the second contact 1315 respectively, so that the first connector 1316 and the second connector 1317 are electrically connected. Since the control device 14 is electrically connected to the first connector 1316 and the second connector 1317, the control device 14 can obtain an electrical signal when the first connector 1316 and the second connector 1317 are electrically connected. The electrical signal obtained at this time is a vibration detection signal. Therefore, the control device 14 can determine whether the trailer energy storage vehicle 1 vibrates according to the connection status of the first connector 1316 and the second connector 1317, and determine that the vehicle state is the start state when the trailer energy storage vehicle 1 vibrates.

[0049] In an optional embodiment of the present invention, Figure 2 As shown, the detection module 13 includes a rotation speed sensor 132, which is used to detect the rotation speed of the vehicle body and output a rotation speed detection signal when the vehicle body moves; the control device 14 is used to: when the rotation speed detection signal is obtained, determine that the vehicle state is a start state.

[0050] Among them, the speed sensor 132 is a sensor that converts the speed of a rotating object into an electrical output, and the speed detection signal refers to the electrical signal output by the speed sensor 132 when it detects that the vehicle body has a speed. When the trailer energy storage vehicle 1 is in the startup state, the vehicle body will move, and at this time the vehicle body has a speed, so that the speed sensor 132 detects the speed and outputs a speed detection signal. Since the speed detection signal is output when the speed sensor 132 detects the speed, when the control device 14 obtains the speed detection signal, it can be determined that the vehicle state is the startup state. Through the above scheme, the vehicle state can be conveniently detected.

[0051] In an optional embodiment of the present invention, Figure 2 and Figure 4 As shown, the control device 14 includes a bidirectional DC / DC converter 141. The bidirectional DC / DC converter 141 is a device that can realize the bidirectional flow of DC power. It can not only boost or reduce the voltage of the DC power stored in the first battery 12 and output it to the traction vehicle 2, but also work in reverse to return the excess power to the first battery 12 for storage. The voltages of the trailer energy storage vehicle 1 and the traction vehicle 2 are usually different. Through the bidirectional DC / DC converter 141, the trailer energy storage vehicle 1 and the traction vehicle 2 can realize mutual charging.

[0052] In some embodiments, the traction vehicle 2 includes a second battery 21, and the second battery 21 is electrically connected to the second interface 3, so when the first interface 4 and the second interface 3 are electrically connected, the bidirectional DC / DC converter 141 is electrically connected to the second battery 21, so that the trailer energy storage vehicle 1 and the traction vehicle 2 can be charged mutually. In addition, in this embodiment, the power of the traction vehicle 2 refers to the power of the second battery 21.

[0053] In an optional embodiment of the present invention, Figure 2 and Figure 4 As shown, the bidirectional DC / DC converter 141 includes a buck-boost module 1411 and a control module 1412. The first end of the buck-boost module 1411 is electrically connected to the first battery 12, the second end of the buck-boost module 1411 is electrically connected to the first interface 4, and the third end of the buck-boost module 1411 is electrically connected to the control module 1412. The control module 1412 is used to control the buck-boost module 1411 to stop working when the vehicle is in the starting state.

[0054] Among them, the buck-boost module 1411 is a power module that can change the voltage output level, can output a certain voltage, and can change the output voltage according to different application needs. Since the first end of the buck-boost module 1411 is electrically connected to the first battery 12, and the second end of the buck-boost module 1411 is electrically connected to the first interface 4, and since the first interface 4 is used for the first battery 12 to transmit power to the outside, when the trailer energy storage vehicle 1 is connected to the traction vehicle 2, the first interface 4 of the trailer energy storage vehicle 1 is electrically connected to the second interface 3 of the traction vehicle 2. Therefore, when the trailer energy storage vehicle 1 charges the traction vehicle 2, the buck-boost module 1411 can convert the voltage of the first battery 12 into the working voltage of the traction vehicle 2. When the traction vehicle 2 charges the first battery 12, the buck-boost module 1411 can convert the voltage of the second battery 21 of the traction vehicle 2 or the voltage of the external charging gun into the working voltage of the first battery 12.

[0055] By controlling the buck-boost module 1411 to stop working when the vehicle is in the startup state, the trailer energy storage vehicle 1 and the traction vehicle 2 will stop charging each other, thereby avoiding poor contact due to vibration causing excessive heating of the first interface 4 and the second interface 3 when the trailer energy storage vehicle 1 and the traction vehicle 2 are connected, thereby preventing safety problems. This solves the problem of a major safety hazard when charging the trailer energy storage vehicle 1 and the traction vehicle 2 while they are moving.

[0056] In an optional embodiment of the present invention, Figure 2 and Figure 4As shown, the control module 1412 is also used for: when the vehicle state is stationary, obtaining a power replenishment signal sent when the traction vehicle 2 is not in an external charging state and the power of the traction vehicle 2 is less than a first preset power, and controlling the buck-boost module 1411 to be in a discharge mode based on the power replenishment signal to charge the traction vehicle 2.

[0057] Among them, the traction vehicle 2 can be charged by an external charging gun, and the traction vehicle 2 is not in an external charging state, which means that there is no external charging gun to charge the traction vehicle 2. When the buck-boost module 1411 is in the discharge mode, it will convert the voltage of the first battery 12 into the working voltage of the second battery 21 of the traction vehicle 2 to charge the second battery 21 of the traction vehicle 2. The recharge signal refers to an electrical signal indicating that the second battery 21 of the traction vehicle 2 is insufficient and needs to be charged. By controlling the buck-boost module 1411 to be in the discharge mode to charge the traction vehicle 2 based on the recharge signal only when the vehicle state is stationary and the power of the traction vehicle 2 is less than the first preset power, it can prevent the safety hazards of charging the traction vehicle 2 while it is moving, and can also replenish the power of the traction vehicle 2 in time when the traction vehicle 2 is insufficient, thereby increasing the mileage of the traction vehicle 2.

[0058] In an optional embodiment of the present invention, Figure 2 and Figure 4 As shown, the control module 1412 is also used for: when the vehicle state is stationary, obtaining a charging signal sent when the traction vehicle 2 is in an external charging state and the power of the traction vehicle 2 is greater than a third preset power, and controlling the buck-boost module 1411 to be in a charging mode based on the charging signal to charge the first battery 12.

[0059] Among them, the tractor vehicle 2 is in an external charging state, which means that the tractor vehicle 2 is charged by an external charging gun. When the buck-boost module 1411 is in the charging mode, it converts the voltage of the external charging gun into the working voltage of the first battery 12 to charge the first battery 12. Therefore, when the tractor vehicle 2 is charged by an external charging gun, when the power of the tractor vehicle 2 is charged to a power greater than the third preset power, a charging signal is given to the trailer energy storage vehicle 1 and the buck-boost module 1411 is started in the charging mode, and the charging gun charges the first battery 12 at the same time until the first battery 12 is fully charged.

[0060] In an optional embodiment of the present invention, the control module 1412 is further used to: when the buck-boost module 1411 is in the discharge mode, when the power of the first battery 12 is 0 or the power of the traction vehicle 2 is greater than a second preset power, control the buck-boost module 1411 to stop working.

[0061] Among them, the second preset power refers to the threshold value of sufficient power of the traction vehicle 2. The second preset power can be set according to the actual situation, for example, the second preset power is set to 90%, or the second preset power is set to 95%. It can be understood that the second preset power can also be other values, and the specific value of the second preset power is not specifically limited here. When the power of the first battery 12 is 0, it means that the first battery 12 has been discharged and cannot continue to discharge, so the buck-boost module 1411 is controlled to stop working and no longer charge the traction vehicle 2. When the power of the traction vehicle 2 is greater than the second preset power, it means that the power of the traction vehicle 2 is sufficient and there is no need to continue charging, so the buck-boost module 1411 is controlled to stop working and no longer charge the traction vehicle 2.

[0062] In an optional embodiment of the present invention, Figure 5 As shown, the trailer energy storage vehicle 1 also includes an MPPT module 15 and a solar cell. The solar cell is electrically connected to the input end of the MPPT module 15, and the output end of the MPPT module 15 is electrically connected to the first battery 12. Among them, the solar cell can be arranged on the roof of the trailer energy storage vehicle 1. Preferably, the solar cell includes a photovoltaic panel. The main function of the MPPT module 15 is to detect the power generation voltage of the solar cell in real time, track the highest voltage and current values, and ensure that the system charges the first battery 12 with the highest efficiency. Therefore, the first battery 12 can be charged by the solar cell and the MPPT module 15 at ordinary times, so as to solve the problem that the first battery 12 is exhausted and the traction vehicle 2 cannot travel.

[0063] In an optional embodiment of the present invention, the trailer energy storage vehicle 1 also includes an inverter 11, which is electrically connected to the first battery 12; the inverter 11 can convert the direct current of the first battery 12 into alternating current, and the inverter 11 can be electrically connected to the AC load, so that the first battery 12 discharges to the AC load through the inverter 11 to power the AC load.

[0064] In an optional embodiment of the present invention, Figure 2 and Figure 4 As shown, the control module 1412 is also used to: when the first battery 12 is discharged through the inverter 11, determine whether the power of the first battery 12 is less than the fourth preset power, and when the power of the first battery 12 is less than the fourth preset power, control the first battery 12 to stop discharging. This ensures that when the second battery 21 of the traction vehicle 2 is exhausted and cannot be started, the trailer energy storage vehicle 1 has a certain amount of power to supplement the traction vehicle 2.

[0065] In an optional embodiment of the present invention, the first preset power, the second preset power, the third preset power and the fourth preset power can be set by the user according to the mileage requirement corresponding to the power of the traction vehicle 2, and no specific limitation is made on the specific values ​​of the first preset power, the second preset power, the third preset power and the fourth preset power.

[0066] Embodiment 2

[0067] Embodiment 2 of the present invention provides an energy storage system, such as Figure 6 As shown, the energy storage system includes a traction vehicle 2 and a trailer energy storage vehicle 1 of any embodiment of the present invention. The trailer energy storage vehicle 1 can be towed by the traction vehicle 2 to other places for off-grid power use scenarios to supply power to loads. The traction vehicle 2 is typically an electric vehicle or a hybrid vehicle. During traction, the first interface 4 of the trailer energy storage vehicle 1 is electrically connected to the second interface 3 of the traction vehicle 2.

[0068] The energy storage system disclosed in this embodiment has the effects of the trailer energy storage vehicle 1 described in any of the above embodiments, and will not be described in detail here.

[0069] In some embodiments, the traction vehicle 2 includes a second battery 21, and the second battery 21 is electrically connected to the second interface 3, so when the first interface 4 and the second interface 3 are electrically connected, the bidirectional DC / DC converter 141 is electrically connected to the second battery 21, so that the trailer energy storage vehicle 1 and the traction vehicle 2 can be charged mutually.

[0070] In an optional embodiment of the present invention, the tractor vehicle 2 further includes an on-board charging system 22 and a charging base 23, and the on-board charging system 22 is electrically connected to the charging base 23, the second battery 21, and the second interface 3. The charging base 23 is used to connect a charging gun, so that an external charging gun can charge the second battery 21 by connecting to the charging base 23.

[0071] In an optional embodiment of the present invention, the on-board charging system 22 is used to: when the vehicle state is stationary, the traction vehicle 2 is not in an external charging state, and the power of the second battery 21 is less than the first preset power, send a power replenishment signal to the control module 1412 of the trailer energy storage vehicle 1, so that the control module 1412 controls the buck-boost module 1411 to be in a discharge mode based on the power replenishment signal to charge the second battery 21. By sending the power replenishment signal only when the vehicle state is stationary and the power of the second battery 21 is less than the first preset power, the safety hazards of charging the traction vehicle 2 while in motion can be prevented, and the trailer energy storage vehicle 1 can be notified in time to replenish power when the traction vehicle 2 is insufficient, thereby increasing the mileage of the traction vehicle 2.

[0072] In an optional embodiment of the present invention, the on-board charging system 22 is used to: when the vehicle state is stationary, the tractor vehicle 2 is in an external charging state, and the power of the tractor vehicle 2 is greater than the third preset power, send a charging signal to the control module 1412 of the trailer energy storage vehicle 1, so that the control module 1412 controls the buck-boost module 1411 to be in a charging mode based on the charging signal to charge the first battery 12. Therefore, when the tractor vehicle 2 is charged by an external charging gun, when the power of the tractor vehicle 2 is charged to be greater than the third preset power, the charging signal is given to the trailer energy storage vehicle 1 and the buck-boost module 1411 is started in the charging mode, and the charging gun simultaneously charges the first battery 12 until the first battery 12 is fully charged.

[0073] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0074] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A trailer energy storage vehicle, characterized in that: include: A vehicle body, a first battery, a detection module, a control device and a first interface; The first battery and the control device are both arranged on the vehicle body; The detection module is used to detect the movement of the vehicle body to obtain a detection signal; The first interface is used for transmitting electric energy between the first battery and the outside; The control device is electrically connected to the detection module, and is used to: obtain the detection signal, determine the vehicle state based on the detection signal, and when the vehicle state is a start-up state, disconnect the electrical connection between the first battery and the first interface.

2. The trailer energy storage vehicle according to claim 1, characterized in that: The detection module includes a vibration switch, and the vibration switch is used to detect the vibration of the vehicle body and output a vibration detection signal when the vehicle body is vibrating; The control device is used to determine that the vehicle state is a start state when the vibration detection signal is acquired.

3. The trailer energy storage vehicle according to claim 2, characterized in that: The vibration switch comprises a housing, a first rolling ball, a second rolling ball, a first contact, a second contact, a first connecting member and a second connecting member; The first contact is electrically connected to the first input terminal of the control device through the first connection member, and the second contact is electrically connected to the second input terminal of the control device through the second connection member; The first rolling ball and the second rolling ball are arranged in the housing, and the first rolling ball and the second rolling ball are used to contact the first contact and the second contact respectively when vibration is detected, so as to electrically connect the first connecting member and the second connecting member.

4. The trailer energy storage vehicle according to claim 1, characterized in that: The detection module includes a rotation speed sensor, which is used to detect the rotation speed of the vehicle body and output a rotation speed detection signal when the vehicle body moves; The control device is used to determine that the vehicle state is a start state when the rotation speed detection signal is acquired.

5. The trailer energy storage vehicle according to any one of claims 1 to 4, characterized in that: The control device includes a bidirectional DC / DC converter.

6. The trailer energy storage vehicle according to claim 5, characterized in that: The bidirectional DC / DC converter includes a buck-boost module and a control module, wherein a first end of the buck-boost module is electrically connected to the first battery, a second end of the buck-boost module is electrically connected to the first interface, and a third end of the buck-boost module is electrically connected to the control module; The control module is used to control the buck-boost module to stop working when the vehicle is in the start-up state.

7. The trailer energy storage vehicle according to claim 6, characterized in that: The control module is further used for: when the vehicle is in a stationary state, obtaining a power replenishment signal sent when the traction vehicle is not in an external charging state and the power of the traction vehicle is less than a first preset power, and controlling the buck-boost module to be in a discharge mode based on the power replenishment signal to charge the traction vehicle, and / or; The control module is also used for: when the vehicle is in a stationary state, obtaining a charging signal sent when the traction vehicle is in an external charging state and the power of the traction vehicle is greater than a third preset power, and controlling the buck-boost module to be in a charging mode based on the charging signal to charge the first battery.

8. The trailer energy storage vehicle according to claim 7, characterized in that: The control module is also used for: When the buck-boost module is in the discharge mode, when the power of the first battery is 0 or the power of the traction vehicle is greater than a second preset power, the buck-boost module is controlled to stop working.

9. The trailer energy storage vehicle according to any one of claims 1 to 4, characterized in that: The trailer energy storage vehicle further includes an inverter, the inverter is electrically connected to the first battery, and / or; The trailer energy storage vehicle also includes an MPPT module and a solar cell, wherein the solar cell is electrically connected to an input end of the MPPT module, and an output end of the MPPT module is electrically connected to the first battery.

10. An energy storage system, characterized in that: The invention comprises a traction vehicle and the trailer energy storage vehicle according to any one of claims 1 to 9.

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