Vehicle-mounted energy storage system and automobile

Abstract

The invention discloses a vehicle-mounted energy storage system and an automobile, and relates to the field of vehicle-mounted photovoltaic technology, and the disclosed vehicle-mounted energy storage system comprises a control module, a first voltage conversion module and a vehicle-mounted low-voltage battery; according to the invention, the control module controls the connection state between the photovoltaic energy collection system and the first voltage conversion module; when the photovoltaic energy collection system is connected to the first voltage conversion module, photovoltaic electric energy is output to the first voltage conversion module; the first voltage conversion module carries out voltage reduction processing on the photovoltaic electric energy to obtain low-voltage photovoltaic electric energy matched with a voltage platform of the vehicle-mounted low-voltage battery; when the vehicle-mounted low-voltage battery does not supply power to the outside, the first voltage conversion module outputs the low-voltage photovoltaic electric energy to the vehicle-mounted low-voltage battery for storage, so that the vehicle-mounted low-voltage battery is used as a photovoltaic energy storage battery, an adaptive low-voltage line does not need to be independently designed for energy transfer, and the cost of parts is effectively reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle-mounted photovoltaic technology, and in particular to a vehicle-mounted energy storage system and a vehicle. Background Art

[0002] Photovoltaic is a clean energy and an important way to effectively reduce carbon emissions. The photovoltaic energy collection system is a system that collects photovoltaic energy through on-board photovoltaic solar panels to assist or drive the vehicle, thereby improving the vehicle's endurance.

[0003] At present, the voltage of the on-board low-voltage battery (i.e., the on-board storage battery) is lower than the voltage range of the photovoltaic energy collection system, which makes the voltage platform of the on-board low-voltage battery mismatch with the voltage platform of the photovoltaic energy collection system. In order to solve this problem, the existing solution is to store the electric energy of the photovoltaic energy collection system by adding a photovoltaic energy storage battery. However, after adding an additional photovoltaic energy storage battery, it is necessary to separately design a corresponding low-voltage line for energy transmission, which increases the cost of components. Summary of the invention

[0004] The main purpose of this application is to provide a vehicle-mounted energy storage system and a vehicle, aiming to solve the technical problem in the prior art that after adding an additional photovoltaic energy storage battery, a separate low-voltage line needs to be designed for energy transmission, resulting in increased component costs.

[0005] To achieve the above-mentioned object, the present application provides a vehicle-mounted energy storage system, the system comprising: a control module, a first voltage conversion module and a vehicle-mounted low-voltage battery;

[0006] The first voltage conversion module is respectively connected to the control module, the vehicle-mounted low-voltage battery and the photovoltaic energy collection system;

[0007] The control module is used to control the connection state between the photovoltaic energy collection system and the first voltage conversion module;

[0008] The photovoltaic energy collection system is used to output photovoltaic power to the first voltage conversion module when connected to the first voltage conversion module;

[0009] The first voltage conversion module is used to step down the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery;

[0010] The first voltage conversion module is further used to output the low-voltage photovoltaic power to the on-board low-voltage battery for storage when the on-board low-voltage battery is not supplying power to the outside.

[0011] In one embodiment, the system further comprises: a first bidirectional switch unit;

[0012] The first bidirectional switch unit is provided with a first switch tube;

[0013] The control end of the first switch tube is connected to the control module, the input end of the first switch tube is connected to the photovoltaic energy collection system, and the output end of the first switch tube is connected to the first voltage conversion module;

[0014] The control module is further used to connect the photovoltaic energy collection system to the first voltage conversion module by controlling the first switch tube to close.

[0015] In one embodiment, the first voltage conversion module includes: a first MOS transistor, a second MOS transistor, a first inductor, a first capacitor and a second capacitor;

[0016] The drain of the first MOS tube is connected to the first end of the vehicle-mounted low-voltage battery and the first end of the first capacitor respectively, the source of the first MOS tube is connected to the first end of the first inductor, the second end of the first inductor is respectively connected to the source of the second MOS tube, the first end of the second capacitor and the output end of the first switch tube, the drain of the second MOS tube, the second end of the second capacitor and the second end of the first capacitor are all connected to the second end of the vehicle-mounted low-voltage battery.

[0017] In one embodiment, the system further includes: a second voltage conversion module, a second bidirectional switch unit, and an on-board high-voltage battery;

[0018] The first bidirectional switch unit is also provided with a second switch tube;

[0019] The second bidirectional switch unit is provided with a third switch tube;

[0020] The control end of the second switch tube is connected to the control module, the input end of the second switch tube is respectively connected to the photovoltaic energy collection system and the input end of the first switch tube, the output end of the second switch tube is connected to the second voltage conversion module, the control end of the third switch tube is connected to the control module, the input end of the third switch tube is connected to the second voltage conversion module, and the output end of the third switch tube is connected to the first end of the vehicle-mounted high-voltage battery;

[0021] The control module is further used to control the second switch tube and the third switch tube to be closed, so that the photovoltaic energy collection system is connected to the vehicle-mounted high-voltage battery through the second voltage conversion module;

[0022] The photovoltaic energy collection system is further used to output the photovoltaic power to the second voltage conversion module when connected to the second voltage conversion module;

[0023] The second voltage conversion module is also used to boost the photovoltaic power when connected to the on-board high-voltage battery to obtain high-voltage photovoltaic power, and pre-charge the on-board high-voltage battery through the high-voltage photovoltaic power.

[0024] In one embodiment, the control module is further used to control both the first switch tube and the second switch tube to be closed, so as to connect the first voltage conversion module to the second voltage conversion module;

[0025] The first voltage conversion module is further used to, when connected to the second voltage conversion module and receiving the low-voltage battery power output by the on-board low-voltage battery, boost the low-voltage battery power to obtain the first boosted battery power;

[0026] The first voltage conversion module is further used to output the first boosted battery electric energy to the second voltage conversion module;

[0027] The second voltage conversion module is used to boost the first boosted battery power to obtain second boosted battery power when connected to the vehicle-mounted high-voltage battery;

[0028] The second voltage conversion module is also used to pre-charge the vehicle-mounted high-voltage battery through the second boosted battery power.

[0029] In one embodiment, the second voltage conversion module is further used to, when connected to the first voltage conversion module and receiving the high-voltage battery power output by the vehicle-mounted high-voltage battery, perform voltage reduction processing on the high-voltage battery power to obtain the first voltage-reduced battery power;

[0030] The second voltage conversion module is further used to output the first stepped-down battery electric energy to the first voltage conversion module;

[0031] The first voltage conversion module is further used to perform voltage reduction processing on the first voltage-reduced battery power to obtain second voltage-reduced battery power;

[0032] The first voltage conversion module is further used to supply power to the on-board low-voltage battery through the second stepped-down battery power when the on-board low-voltage battery supplies power to the outside.

[0033] In one embodiment, the second voltage conversion module includes: a third MOS transistor, a fourth MOS transistor, a fifth MOS transistor, a sixth MOS transistor, a seventh MOS transistor, an eighth MOS transistor, a ninth MOS transistor, a tenth MOS transistor, a second inductor, a first transformer coil, a second transformer coil, a third transformer coil and a third capacitor;

[0034] The first end of the first transformer coil is connected to the drain of the third MOS tube and the drain of the fourth MOS tube respectively, the second end of the first transformer coil is connected to the first end of the second inductor and the first end of the second transformer coil respectively, and the second end of the second inductor is connected to the output end of the second switch tube;

[0035] The second end of the second transformer coil is respectively connected to the drain of the fifth MOS tube and the drain of the sixth MOS tube, and the source of the third MOS tube, the source of the fourth MOS tube, the source of the fifth MOS tube and the source of the sixth MOS tube are all connected to the second end of the on-board low-voltage battery;

[0036] The first end of the third transformer coil is respectively connected to the source of the seventh MOS tube and the drain of the eighth MOS tube, and the second end of the third transformer coil is respectively connected to the source of the ninth MOS tube and the drain of the tenth MOS tube;

[0037] The first end of the third capacitor is respectively connected to the drain of the seventh MOS tube, the drain of the ninth MOS tube and the input end of the third switch tube, and the second end of the third capacitor is respectively connected to the source of the eighth MOS tube, the source of the tenth MOS tube and the second end of the vehicle-mounted high-voltage battery.

[0038] In one embodiment, the system further comprises: a bidirectional DCDC module and a bidirectional OBC module;

[0039] The second bidirectional switch unit is also provided with a fourth switch tube;

[0040] The control end of the fourth switch tube is connected to the control module, the input end of the fourth switch tube is connected to the input end of the third switch tube, the output end of the fourth switch tube is connected to the bidirectional DCDC module, and the bidirectional DCDC module is respectively connected to the bidirectional OBC module and the on-board high-voltage battery;

[0041] The control module is further used to connect the second voltage conversion module to the bidirectional DCDC module by controlling the fourth switch tube to close when the second voltage conversion module is connected to the vehicle-mounted high-voltage battery;

[0042] The second voltage conversion module is further used to output the high-voltage photovoltaic power energy obtained by the boosting process to the bidirectional DCDC module when connected to the bidirectional DCDC module;

[0043] The bidirectional DCDC module is used to step down the high-voltage photovoltaic power to obtain stepped-down photovoltaic power, and output the stepped-down photovoltaic power to the bidirectional OBC module;

[0044] The bidirectional OBC module is used to convert the stepped-down photovoltaic power into AC power, and supply power to an external load through the AC power.

[0045] In one embodiment, the bidirectional DCDC module includes: an eleventh MOS transistor, a twelfth MOS transistor, a thirteenth MOS transistor, a fourteenth MOS transistor, a fifteenth MOS transistor, a sixteenth MOS transistor, a seventeenth MOS transistor, an eighteenth MOS transistor, a fourth capacitor, a fifth capacitor, a fourth transformer coil, and a fifth transformer coil;

[0046] The bidirectional DCDC module includes: a nineteenth MOS tube, a twentieth MOS tube, a twenty-first MOS tube, a twenty-second MOS tube, a third inductor and a sixth capacitor;

[0047] The first end of the fourth transformer coil is respectively connected to the drain of the eleventh MOS tube and the source of the twelfth MOS tube, the second end of the fourth transformer coil is respectively connected to the source of the thirteenth MOS tube and the drain of the fourteenth MOS tube, the drain of the twelfth MOS tube, the drain of the thirteenth MOS tube and the first end of the fourth capacitor are all connected to the output end of the fourth switch tube, the source of the eleventh MOS tube, the source of the fourteenth MOS tube and the second end of the fourth capacitor are all connected to the second end of the vehicle-mounted high-voltage battery;

[0048] The first end of the fifth transformer coil is respectively connected to the source of the fifteenth MOS tube and the drain of the sixteenth MOS tube, the second end of the fifth transformer coil is respectively connected to the source of the seventeenth MOS tube and the drain of the eighteenth MOS tube, the drain of the fifteenth MOS tube and the drain of the seventeenth MOS tube are both connected to the first end of the fifth capacitor, and the source of the sixteenth MOS tube and the source of the eighteenth MOS tube are both connected to the second end of the fifth capacitor;

[0049] The first end of the sixth capacitor is respectively connected to the first end of the fifth capacitor, the drain of the nineteenth MOS tube and the drain of the twentieth MOS tube, the second end of the sixth capacitor is respectively connected to the source of the twenty-first MOS tube and the source of the twenty-second MOS tube, the source of the nineteenth MOS tube is respectively connected to the drain of the twenty-first MOS tube and the first end of the AC interface, the source of the 20th MOS tube is respectively connected to the drain of the twenty-second MOS tube and the first end of the third inductor, and the second end of the third inductor is connected to the second end of the AC interface.

[0050] In addition, to achieve the above objectives, the present application also proposes a car, which includes the on-board energy storage system as described above.

[0051] One or more technical solutions proposed in this application have at least the following technical effects:

[0052] The vehicle-mounted energy storage system of the present application includes: a control module, a first voltage conversion module and a vehicle-mounted low-voltage battery; the first voltage conversion module is connected to the control module, the vehicle-mounted low-voltage battery and the photovoltaic energy collection system respectively; the present application controls the connection state between the photovoltaic energy collection system and the first voltage conversion module through the control module; when the photovoltaic energy collection system is connected to the first voltage conversion module, it outputs photovoltaic power to the first voltage conversion module; the first voltage conversion module performs voltage reduction processing on the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the vehicle-mounted low-voltage battery; when the vehicle-mounted low-voltage battery does not supply power to the outside, the first voltage conversion module outputs the low-voltage photovoltaic power to the vehicle-mounted low-voltage battery for storage. Since the present application performs voltage reduction processing on the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the vehicle-mounted low-voltage battery, and then outputs the low-voltage photovoltaic power to the vehicle-mounted low-voltage battery for storage, the vehicle-mounted low-voltage battery is used as the photovoltaic energy storage battery of the photovoltaic energy collection system, without the need to add additional photovoltaic energy storage batteries, and then no longer needs to design a separately adapted low-voltage line for energy transmission, which effectively reduces the cost of components. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 This is a structural schematic diagram of the first embodiment of the vehicle-mounted energy storage system of the present application;

[0056] Figure 2 This is a connection diagram of the first switch tube in the first embodiment of the vehicle-mounted energy storage system of the present application;

[0057] Figure 3 This is a circuit diagram of the first embodiment of the vehicle-mounted energy storage system of the present application;

[0058] Figure 4 This is a structural schematic diagram of the second embodiment of the vehicle-mounted energy storage system of the present application;

[0059] Figure 5 This is a circuit diagram of the second embodiment of the vehicle-mounted energy storage system of the present application;

[0060] Figure 6 This is a schematic structural diagram of the third embodiment of the vehicle-mounted energy storage system of the present application;

[0061] Figure 7 This is a circuit diagram of the third embodiment of the vehicle-mounted energy storage system of the present application.

[0062] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0063] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0064] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0065] The main solution of the embodiment of the present application is: the control module controls the connection status between the photovoltaic energy collection system and the first voltage conversion module; when the photovoltaic energy collection system is connected to the first voltage conversion module, it outputs photovoltaic power to the first voltage conversion module; the first voltage conversion module steps down the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery; when the on-board low-voltage battery is not supplying power to the outside, the first voltage conversion module outputs the low-voltage photovoltaic power to the on-board low-voltage battery for storage.

[0066] The voltage of the on-board low-voltage battery (i.e., the on-board storage battery) is lower than the voltage range of the photovoltaic energy collection system. For example, under normal circumstances, the voltage of the photovoltaic energy collection system is between 12V and 90V, while the general specification of the on-board low-voltage battery is 12V. Therefore, in order to match the voltage platform of the on-board low-voltage battery with the voltage platform of the photovoltaic energy collection system, the existing technology will add a photovoltaic energy storage battery to the on-board low-voltage battery to store the electricity of the photovoltaic energy collection system. However, after adding an additional photovoltaic energy storage battery, it is necessary to design a separate low-voltage line to transfer energy, and different low-voltage lines will increase the cost of components.

[0067] The present application provides a solution, in which the first voltage conversion module steps down the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery, and then outputs the low-voltage photovoltaic power to the on-board low-voltage battery for storage, thereby realizing the use of the on-board low-voltage battery as a photovoltaic energy storage battery for the photovoltaic energy collection system, without the need for additional photovoltaic energy storage batteries, and further without the need to separately design a corresponding low-voltage line for energy transfer, effectively reducing component costs.

[0068] Based on this, the embodiment of the present application provides a vehicle-mounted energy storage system, referring to Figure 1 , Figure 1 This is a schematic structural diagram of the first embodiment of the vehicle-mounted energy storage system of the present application.

[0069] In this embodiment, the vehicle-mounted energy storage system includes: a control module 100 , a first voltage conversion module 200 and a vehicle-mounted low-voltage battery 300 .

[0070] The first voltage conversion module 200 is connected to the control module 100 , the vehicle-mounted low-voltage battery 300 , and the photovoltaic energy collection system 400 , respectively.

[0071] It should be noted that the above-mentioned on-board low-voltage battery can be an on-board storage battery installed on the vehicle for providing and storing electrical energy, and can power the vehicle's lighting, ignition system, audio, air conditioning, electric windows, electric seats and other electronic equipment. The first end of the above-mentioned first voltage conversion module can be connected to the first end of the on-board low-voltage battery, and the second end of the first voltage conversion module can be connected to the second end of the on-board low-voltage battery. The first end of the above-mentioned on-board low-voltage battery and the second end of the on-board low-voltage battery can be the positive and negative electrodes of the on-board low-voltage battery. When the first end of the on-board low-voltage battery is the positive electrode, the second end of the on-board low-voltage battery is the negative electrode. When the second end of the on-board low-voltage battery is the positive electrode, the first end of the on-board low-voltage battery is the negative electrode. This embodiment does not limit this.

[0072] The control module 100 is used to control the connection state between the photovoltaic energy collection system 400 and the first voltage conversion module 200 .

[0073] It should be noted that the photovoltaic energy collection system 400 may be a system that utilizes photovoltaic solar panels to collect solar energy and converts it into electrical energy.

[0074] In a specific implementation, a switch device may be provided in the control module 100, or a switch device may be provided in the vehicle-mounted energy storage system, one end of the switch device is connected to the first voltage conversion module, and the other end is connected to the photovoltaic energy collection system, and the opening and closing of the switch device is controlled by the control module 100. The control module 100 controls the connection state between the photovoltaic energy collection system 400 and the first voltage conversion module 200 by controlling the opening and closing of the switch device.

[0075] Furthermore, in this embodiment, the vehicle-mounted energy storage system further includes: a first bidirectional switch unit 101;

[0076] Reference Figure 2 , Figure 2 This is a connection diagram of the first switch tube in the first embodiment of the vehicle-mounted energy storage system of the present application. Figure 2 In the embodiment, the first bidirectional switch unit 101 is provided with a first switch tube S1.

[0077] The control end of the first switch tube S1 is connected to the control module 100 , the input end of the first switch tube S1 is connected to the photovoltaic energy collection system 400 , and the output end of the first switch tube S1 is connected to the first voltage conversion module 200 ;

[0078] The control module 100 is further configured to connect the photovoltaic energy collection system 400 to the first voltage conversion module 300 by controlling the first switch tube S1 to be closed.

[0079] It should be noted that Figure 2 In the subsequent figures, the first switch tube S1 is described as an NPN transistor, but this is not limited to the present solution, and it can also be a PNP transistor, a MOS tube, etc.

[0080] In a specific implementation, when the control module 100 controls the first switch tube S1, the circuit between the photovoltaic energy collection system 400 and the first voltage conversion module 200 can be turned on, and the photovoltaic energy collection system 400 can be connected to the first voltage conversion module 200. When the control module controls the first switch tube S1 to be disconnected, the connection between the photovoltaic energy collection system 400 and the first voltage conversion module 200 can be controlled to be disconnected.

[0081] The photovoltaic energy collection system 400 is used to output photovoltaic power to the first voltage conversion module 200 when connected to the first voltage conversion module 200 .

[0082] In a specific implementation, the photovoltaic solar panel of the photovoltaic energy collection system 400 can be installed on a vehicle body, such as a roof. When the control module 100 controls the photovoltaic energy collection system 400 to connect to the first voltage conversion module 200, the photovoltaic energy collection system 400 collects solar energy through the photovoltaic solar panel and converts the solar energy into photovoltaic electric energy, and then outputs the photovoltaic electric energy to the first voltage conversion module 200.

[0083] The first voltage conversion module 200 is used to reduce the voltage of the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery 300 .

[0084] In a specific implementation, a step-down circuit (i.e., a BUCK circuit) may be provided in the first voltage conversion module 200. After receiving photovoltaic power, the photovoltaic power can be stepped down to convert the photovoltaic power into low-voltage photovoltaic power whose voltage matches the voltage platform of the on-board low-voltage battery 300.

[0085] Further, refer to Figure 3 , Figure 3 This is a circuit diagram of the first embodiment of the vehicle-mounted energy storage system of the present application. Figure 3In the embodiment, the first voltage conversion module 200 includes: a first MOS transistor Q1, a second MOS transistor Q2, a first inductor L1, a first capacitor C1 and a second capacitor C2.

[0086] The drain of the first MOS tube Q1 is connected to the first end of the vehicle-mounted low-voltage battery 300 and the first end of the first capacitor C1 respectively, the source of the first MOS tube Q1 is connected to the first end of the first inductor L1, the second end of the first inductor L1 is respectively connected to the source of the second MOS tube Q2, the first end of the second capacitor C2 and the output end of the first switch tube S1, the drain of the second MOS tube Q2, the second end of the second capacitor C2, and the second end of the first capacitor C1 are all connected to the second end of the vehicle-mounted low-voltage battery 300.

[0087] In a specific implementation, the input end of the first switch S1 can lead to a first photovoltaic interface, and the second end of the vehicle-mounted low-voltage battery can lead to a second photovoltaic interface. The photovoltaic energy collection system 400 is connected to the vehicle-mounted low-voltage battery and the first switch tube S1 through the first photovoltaic interface and the second photovoltaic interface to output photovoltaic power to the first voltage conversion module 200. The first inductor L1, the first MOS tube Q1, the first capacitor C1 and the vehicle-mounted low-voltage battery 300 in the first voltage conversion module 200 constitute a BUCK circuit. The control module 100 can output a corresponding pulse width modulation (PWM) signal to control the first MOS tube Q1 to close and open. The first inductor L1 stores energy when the first MOS tube Q1 is closed, and releases energy when the first MOS tube Q1 is opened. The voltage of the photovoltaic power is reduced through the cycle of closing and opening the first MOS tube Q1, and the output voltage is smoothed through the first capacitor C1 to reduce voltage ripple.

[0088] In addition, the first switch tube S1 can be connected in parallel with the first diode D1, the anode of the first diode D1 is connected to the output end of the first switch tube S1, and the cathode of the first diode D1 is connected to the input end of the first switch tube S1 to ensure that the current flows unidirectionally from the photovoltaic energy collection system 400 to the on-board low-voltage battery 300.

[0089] It should be understood that, through the above-mentioned BUCK circuit, corresponding parameters can be set so that the photovoltaic power of photovoltaic energy collection systems with different voltage platforms can be converted into low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery 300, thereby improving the flexibility of voltage platform selection of the photovoltaic energy collection system.

[0090] The first voltage conversion module 200 is also used to output the low-voltage photovoltaic power to the on-board low-voltage battery 300 for storage when the on-board low-voltage battery 300 is not supplying power to the outside.

[0091] In a specific implementation, the control module 100 can control the first switch tube S1 to close when it is detected that the vehicle-mounted low-voltage battery 300 is not supplying power to the electronic device, that is, not working, to turn on the loop between the vehicle-mounted low-voltage battery, the BUCK circuit and the photovoltaic energy collection system 400, so that the first voltage conversion module 200 can output the photovoltaic power obtained by voltage reduction to the vehicle-mounted low-voltage battery 300, and the vehicle-mounted low-voltage battery 300 can store the received low-voltage photovoltaic power, so that the vehicle-mounted low-voltage battery 300 can be used as an energy storage battery for the photovoltaic energy collection system 400, and the voltage of the photovoltaic energy collection system 400 and the vehicle-mounted low-voltage battery 300 can be flexibly adapted, so that the product can be serialized, the photovoltaic input can be efficiently integrated into the vehicle's energy storage system, and it can be suitable for electric vehicles of different sizes.

[0092] The present embodiment provides a vehicle-mounted energy storage system, which includes: a control module, a first voltage conversion module and a vehicle-mounted low-voltage battery; the first voltage conversion module is respectively connected to the control module, the vehicle-mounted low-voltage battery and the photovoltaic energy collection system; the present embodiment controls the connection state between the photovoltaic energy collection system and the first voltage conversion module through the control module; when the photovoltaic energy collection system is connected to the first voltage conversion module, it outputs photovoltaic power to the first voltage conversion module; the first voltage conversion module steps down the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the vehicle-mounted low-voltage battery; when the vehicle-mounted low-voltage battery is not supplying power to the outside, the first voltage conversion module outputs the low-voltage photovoltaic power to the vehicle-mounted low-voltage battery for storage. Since this embodiment steps down the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery, the low-voltage photovoltaic power is output to the on-board low-voltage battery for storage, thereby realizing the use of the on-board low-voltage battery as a photovoltaic energy storage battery for the photovoltaic energy collection system. There is no need to add additional photovoltaic energy storage batteries, and there is no need to separately design a corresponding low-voltage line for energy transfer, which effectively reduces component costs.

[0093] Based on the first embodiment of the present application, the second embodiment of the present application is proposed. In the second embodiment of the present application, the same or similar contents as those of the first embodiment can be referred to the above introduction, and will not be repeated later. Figure 4 , Figure 4 This is a schematic structural diagram of the second embodiment of the vehicle-mounted energy storage system of the present application.

[0094] In this embodiment, the vehicle-mounted energy storage system further includes: a second voltage conversion module 500 , a second bidirectional switch unit 102 and a vehicle-mounted high-voltage battery 600 .

[0095] The first bidirectional switch unit 101 is further provided with a second switch tube S2.

[0096] The second bidirectional switch unit 102 is provided with a third switch tube S3 .

[0097] The control end of the second switch tube S2 is connected to the control module 100, the input end of the second switch tube S2 is respectively connected to the photovoltaic energy collection system 400 and the input end of the first switch tube S1, the output end of the second switch tube S2 is connected to the second voltage conversion module 500, the control end of the third switch tube S3 is connected to the control module 100, the input end of the third switch tube S3 is connected to the second voltage conversion module 500, and the output end of the third switch tube S3 is connected to the first end of the vehicle-mounted high-voltage battery 600.

[0098] in, Figure 4 In the subsequent figures, the second switch tube S1 and the third switch tube S3 are described using NPN transistors, but this is not limited to the present solution, and they may also be PNP transistors, MOS transistors, etc.

[0099] The control module 100 is further used to control the second switch tube S2 and the third switch tube S3 to be closed, so that the photovoltaic energy collection system 400 is connected to the vehicle-mounted high-voltage battery 600 through the second voltage conversion module 500.

[0100] The photovoltaic energy collection system 400 is also used to output the photovoltaic power to the second voltage conversion module 500 when connected to the second voltage conversion module 500 .

[0101] It should be noted that the above-mentioned on-board high-voltage battery 600 may be a battery with a relatively high voltage (such as up to 400V) and is responsible for providing power to the power system of the electric vehicle.

[0102] In a specific implementation, the control module 100 can control the second switch tube S2 and the third switch tube S3 to be closed, and conduct the circuit between the photovoltaic energy collection system 400, the second voltage conversion module 500 and the vehicle-mounted high-voltage battery 600, so that the photovoltaic energy collection system 400 is connected to the vehicle-mounted high-voltage battery 600 through the second voltage conversion module 500. When the photovoltaic energy collection system 400 is connected to the second voltage conversion module 500, the photovoltaic power generated by it can be output to the second voltage conversion module 500.

[0103] Among them, the second switch tube S1 can be connected in parallel with the second diode D2, the anode of the second diode D1 is connected to the output end of the second switch tube S2, and the cathode of the second diode D2 is connected to the input end of the second switch tube S1, so as to ensure that the current flows from the photovoltaic energy collection system 400 to the vehicle-mounted high-voltage battery 600 in a unidirectional manner. Correspondingly, the third switch tube S3 can be connected in parallel with the third diode D3, the anode of the third diode D3 is connected to the output end of the third switch tube S3, and the cathode of the third diode D3 is connected to the input end of the third switch tube S3, so as to ensure that the current flows from the second voltage conversion module 500 to the vehicle-mounted high-voltage battery 600 in a unidirectional manner.

[0104] The second voltage conversion module 500 is also used to boost the photovoltaic power when connected to the on-board high-voltage battery 600 to obtain high-voltage photovoltaic power, and pre-charge the on-board high-voltage battery 600 with the high-voltage photovoltaic power.

[0105] In a specific implementation, since the voltage of photovoltaic power is lower than the voltage platform of the on-board high-voltage battery 600, a corresponding boost circuit can be set in the second voltage conversion module 500. When the second voltage conversion module 500 is connected to the on-board high-voltage battery 600 and receives the photovoltaic power input by the photovoltaic energy collection system 400, the photovoltaic power can be boosted through the boost circuit to obtain high-voltage photovoltaic power that matches the voltage platform of the on-board high-voltage battery 600, and the high-voltage photovoltaic power is output to the on-board high-voltage battery 600 to pre-charge the on-board high-voltage battery 600, that is, before the on-board high-voltage battery 600 is conventionally charged, the on-board high-voltage battery 600 is first charged based on the high-voltage photovoltaic power, to ensure that the on-board high-voltage battery 600 is in a safe and suitable state before charging, and to improve the safety and efficiency of the charging process.

[0106] Further, refer to Figure 5 , Figure 5 This is a circuit diagram of the second embodiment of the vehicle-mounted energy storage system of the present application. Figure 5 In the embodiment, the second voltage conversion module 500 includes: a third MOS tube Q3, a fourth MOS tube Q4, a fifth MOS tube Q5, a sixth MOS tube Q6, a seventh MOS tube Q7, an eighth MOS tube Q8, a ninth MOS tube Q9, a tenth MOS tube Q10, a second inductor L2, a first transformer coil N1, a second transformer coil N2, a third transformer coil N3 and a third capacitor C3.

[0107] The first end of the first transformer coil N1 is respectively connected to the drain of the third MOS tube Q3 and the drain of the fourth MOS tube Q4, the second end of the first transformer coil N1 is respectively connected to the first end of the second inductor L2 and the first end of the second transformer coil N2, and the second end of the second inductor L2 is connected to the output end of the second switch tube S2.

[0108] The second end of the second transformer coil N2 is respectively connected to the drain of the fifth MOS tube Q5 and the drain of the sixth MOS tube Q6, and the source of the third MOS tube Q3, the source of the fourth MOS tube Q4, the source of the fifth MOS tube Q5 and the source of the sixth MOS tube Q6 are all connected to the second end of the on-board low-voltage battery 300.

[0109] The first end of the third transformer coil N3 is respectively connected to the source of the seventh MOS transistor Q7 and the drain of the eighth MOS transistor Q8, and the second end of the third transformer coil N3 is respectively connected to the source of the ninth MOS transistor Q9 and the drain of the tenth MOS transistor Q10.

[0110] The first end of the third capacitor C3 is respectively connected to the drain of the seventh MOS tube Q7, the drain of the ninth MOS tube Q9 and the input end of the third switch tube S3, and the second end of the third capacitor C3 is respectively connected to the source of the eighth MOS tube Q8, the source of the tenth MOS tube Q10 and the second end of the vehicle-mounted high-voltage battery 600.

[0111] It should be noted that the gates of the third MOS tube Q3, the fourth MOS tube Q4, the fifth MOS tube Q5, the sixth MOS tube Q6, the seventh MOS tube Q7, the eighth MOS tube Q8, the ninth MOS tube Q9 and the tenth MOS tube Q10 can all be connected to the control module 100, and the opening and closing are controlled by the control module 100.

[0112] It should be noted that, when reducing the voltage, the control module 100 can control the third MOS tube Q3, the fourth MOS tube Q4, the eighth MOS tube Q8 and the ninth MOS tube Q9 to be closed, and the fifth MOS tube Q5, the sixth MOS tube Q6, the seventh MOS tube Q7 and the tenth MOS tube Q10 to be opened, so as to form a push-pull circuit with the first transformer coil N1 as the primary side and the third transformer coil N3 as the secondary side. After the second switch tube S2 and the third switch tube S3 are closed, the boost loop formed by the photovoltaic energy collection system 400, the vehicle-mounted high-voltage battery 600 and the push-pull circuit is turned on. In the push-pull circuit, the photovoltaic power output by the photovoltaic energy collection system 400 is boosted by the push-pull principle to obtain the above-mentioned high-voltage photovoltaic power, and the high-voltage photovoltaic power is output to the vehicle-mounted high-voltage battery 600 to pre-charge the vehicle-mounted high-voltage battery 600.

[0113] It is understandable that by connecting the third MOS tube Q3 and the fourth MOS tube Q4 in parallel, and the fifth MOS tube Q5 and the sixth MOS tube Q6 in parallel, a certain power can be carried when the voltage is reduced or increased, thereby improving the charging efficiency.

[0114] Furthermore, in this embodiment, the control module 100 is further used to control the first switch tube S1 and the second switch tube S2 to be closed, so as to connect the first voltage conversion module 200 to the second voltage conversion module 500 .

[0115] In a specific implementation, the above-mentioned control module 100 can control the first switch tube S1 and the second switch tube S2 to be closed, thereby connecting the circuit between the on-board low-voltage battery 300, the first voltage conversion module 200, the second voltage conversion module 500 and the on-board high-voltage battery 600, and connecting the first voltage conversion module 200 to the second voltage conversion module 500.

[0116] The first voltage conversion module 200 is also used to boost the low-voltage battery power when it is connected to the second voltage conversion module 500 and receives the low-voltage battery power output by the on-board low-voltage battery 300 to obtain the first boosted battery power.

[0117] The first voltage conversion module 200 is further used to output the first boosted battery power to the second voltage conversion module 500 .

[0118] In the specific implementation, Figure 4 As shown, the first inductor L1, the second MOS tube Q2 and the second capacitor C2 in the first voltage conversion module 100 can form a Boost circuit. When the first voltage conversion module 200 is connected to the second voltage conversion module 500 and receives the low-voltage battery power, the control module 100 can control the first MOS tube Q1 to close, and control the second MOS tube to periodically turn on and off through the corresponding PWM signal to boost the low-voltage battery power output by the vehicle-mounted low-voltage battery 300, obtain the first boosted battery power, and output the first boosted battery power to the second voltage conversion module 500 through the first switch tube S1 and the second switch tube S2.

[0119] The second voltage conversion module 500 is used to boost the first boosted battery power to obtain second boosted battery power when connected to the vehicle-mounted high-voltage battery.

[0120] The second voltage conversion module 500 is further used to pre-charge the vehicle-mounted high-voltage battery 600 through the second boosted battery power.

[0121] In the specific implementation, Figure 5As shown, the second inductor L2 of the second voltage conversion module 500 receives the above-mentioned first boosted battery power. Accordingly, the control module 100 can control the third MOS tube Q3, the fourth MOS tube Q4, the eighth MOS tube Q8 and the ninth MOS tube Q9 to be closed, and the fifth MOS tube Q5, the sixth MOS tube Q6, the seventh MOS tube Q7 and the tenth MOS tube Q10 to be disconnected, and the first transformer coil N1 is used as the primary side and the third transformer coil N3 is used as the secondary side to form a push-pull circuit. The above-mentioned first boosted battery power is boosted by the push-pull principle to obtain the second boosted battery power, and the second boosted battery power is output to the on-board high-voltage battery 600 through the third switch tube S3 to pre-charge the on-board high-voltage battery 600.

[0122] In addition, when the on-board high-voltage battery 600 is discharged, the photovoltaic energy collection system 400 can also output the second boosted battery power through the second voltage conversion module 500 to replenish the on-board high-voltage battery 600 to improve the discharge efficiency of the on-board high-voltage battery 600.

[0123] It should be understood that when the vehicle is not running, the on-board high-voltage battery does not need to power external loads and supports charging, the photovoltaic energy collection system 400 can be used as a voltage-stabilized power supply to charge the on-board high-voltage battery 600 through the second voltage conversion module 500 outputting the second boosted battery power. During the charging process, the boost power of the second voltage conversion module 500 can be controlled to be less than or equal to the output power of the photovoltaic energy collection system 400 to avoid the on-board low-voltage battery 300 from running out of power.

[0124] Furthermore, in this embodiment, the second voltage conversion module 500 is also used to reduce the voltage of the high-voltage battery power when it is connected to the first voltage conversion module 200 and receives the high-voltage battery power output by the on-board high-voltage battery 600, so as to obtain the first reduced-voltage battery power.

[0125] The second voltage conversion module 500 is further used to output the first stepped-down battery power to the first voltage conversion module 200 .

[0126] In the specific implementation, Figure 5As shown, after the second voltage conversion module 500 is connected to the first voltage conversion module 200, when the high-voltage battery power output by the vehicle-mounted high-voltage battery 600 is received on one side of the third transformer coil N3, the control module 100 can control the third MOS tube Q3, the fourth MOS tube Q4, the eighth MOS tube Q8 and the ninth MOS tube Q9 to be disconnected, and the fifth MOS tube Q5, the sixth MOS tube Q6, the seventh MOS tube Q7 and the tenth MOS tube Q10 to be closed, and a push-pull circuit is formed with the third transformer coil N3 as the primary side and the second transformer coil N2 as the secondary side, and the high-voltage battery power is stepped down by the push-pull principle to obtain the first stepped-down battery power, and the first stepped-down battery power is output to the first voltage conversion module 200 through the first switch tube S1 and the second switch tube S2.

[0127] The first voltage conversion module 200 is further used to perform voltage reduction processing on the first voltage-reduced battery power to obtain second voltage-reduced battery power.

[0128] The first voltage conversion module 200 is further configured to supply power to the on-board low-voltage battery 300 through the second stepped-down battery power when the on-board low-voltage battery 300 supplies power to the outside.

[0129] Accordingly, if Figure 4 As shown, the first inductor L1, the first MOS tube Q1, the first capacitor C1 and the vehicle-mounted low-voltage battery 300 in the above-mentioned first voltage conversion module 200 constitute a BUCK circuit. The control module 100 can output a PWM signal to control the closing and opening cycle of the first MOS tube Q1 to achieve step-down of the first stepped-down battery energy to obtain the second stepped-down battery energy. When the vehicle-mounted low-voltage battery 300 supplies power to the outside, the first voltage conversion module 200 can power the vehicle-mounted low-voltage battery 300 through the second stepped-down battery energy.

[0130] In addition, when the above-mentioned vehicle-mounted low-voltage battery is supplying power to the outside, the above-mentioned photovoltaic energy collection system 400 can also output low-voltage photovoltaic power through the first voltage conversion module 200 to power the vehicle-mounted low-voltage battery 300, thereby achieving that both the vehicle-mounted high-voltage battery 600 and the photovoltaic energy collection system 400 can supply power to the vehicle-mounted low-voltage battery 300, and can be replenished through the photovoltaic energy collection system 400 when the vehicle-mounted low-voltage battery 300 is low in power.

[0131] Furthermore, when the on-board low-voltage battery 300 needs to operate stably during the operation of the vehicle, and the power supplied to the on-board low-voltage battery 300 by the photovoltaic energy collection system through the first voltage conversion module 200 is relatively high, such as when the power supply is greater than 300Wh, the remaining power (State of Charge, SOC) of the on-board low-voltage battery 300 can be set to a preset SOC threshold. When the SOC of the on-board low-voltage battery 300 is lower than the preset SOC threshold, the power supplied to the on-board low-voltage battery 300 by the on-board high-voltage battery 600 through the second voltage conversion module 500 can be increased. When the SOC of the on-board low-voltage battery is higher than the preset SOC threshold, the power supplied to the on-board low-voltage battery 300 by the on-board high-voltage battery 600 through the second voltage conversion module 500 can be reduced, thereby maintaining a portion of the power of the on-board low-voltage battery 300 provided by the photovoltaic energy collection system 400, thereby reducing the energy loss of the on-board high-voltage battery 600.

[0132] It should be noted that the above-mentioned preset SOC threshold can be selected in a balanced manner according to indicators such as the discharge power of the photovoltaic energy collection system 400, the battery capacity of the on-board low-voltage battery 300, the minimum voltage for starting the vehicle, and the minimum current for starting the vehicle, such as 50%.

[0133] Based on the second embodiment of the present application, the third embodiment of the present application is proposed. In the third embodiment of the present application, the same or similar contents as those of the first embodiment and the second embodiment can be referred to the above introduction, and will not be repeated in the following. Figure 6 , Figure 6 This is a structural diagram of the third embodiment of the vehicle-mounted energy storage system of the present application.

[0134] In this embodiment, the vehicle-mounted energy storage system further includes: a bidirectional DCDC module 700 and a bidirectional OBC module 800 .

[0135] The second bidirectional switch unit 102 is further provided with a fourth switch tube S4.

[0136] The control end of the fourth switch tube S4 is connected to the control module, the input end of the fourth switch tube S4 is connected to the input end of the third switch tube S3, the output end of the fourth switch tube S4 is connected to the bidirectional DCDC module 700, and the bidirectional DCDC module 700 is respectively connected to the bidirectional OBC module 800 and the on-board high-voltage battery 600.

[0137] The control module 100 is further used to connect the second voltage conversion module 500 to the bidirectional DCDC module 700 by controlling the fourth switch tube S4 to close when the second voltage conversion module 500 is connected to the vehicle-mounted high-voltage battery 600.

[0138] In a specific implementation, when the control module 100 detects that the second voltage conversion module 500 is connected to the vehicle-mounted high-voltage battery 600, it can control the fourth switch tube S4 to close, thereby turning on the loop between the second voltage conversion module and the bidirectional DCDC module 700 to connect the second voltage conversion module 500 to the bidirectional DCDC module 700.

[0139] In addition, the fourth switch tube S4 can be connected in parallel with a fourth diode D4, the anode of the fourth diode D4 is connected to the output end of the fourth switch tube S4, and the cathode of the fourth diode D4 is connected to the input end of the fourth switch tube S4 to ensure that the current flows unidirectionally from the second voltage conversion module 500 to the bidirectional DCDC module 700.

[0140] The second voltage conversion module 500 is also used to output the high-voltage photovoltaic power energy obtained by the boosting process to the bidirectional DCDC module 700 when connected to the bidirectional DCDC module 700 .

[0141] In a specific implementation, when the fourth switch tube S4 is closed, the second voltage conversion module 500 can output the high-voltage photovoltaic power obtained by boosting to the bidirectional DCDC module 700. The process of the second voltage conversion module 500 boosting the photovoltaic power output by the photovoltaic energy collection system 400 to obtain high-voltage photovoltaic power can be referred to the above description, which will not be repeated here.

[0142] The bidirectional DCDC module 700 is used to step down the high-voltage photovoltaic power to obtain stepped-down photovoltaic power, and output the stepped-down photovoltaic power to the bidirectional OBC module 800.

[0143] In a specific implementation, since the high-voltage photovoltaic power matches the voltage platform of the vehicle-mounted high-voltage battery 600, the voltage of the high-voltage photovoltaic power is relatively high, such as 400V. When supplying power to an external load, the voltage required by the load is lower than the voltage platform of the vehicle-mounted high-voltage battery 600, such as 220V. Therefore, the above-mentioned bidirectional DCDC module 700 can step down the high-voltage photovoltaic power to obtain the stepped-down photovoltaic power suitable for supplying power to the external load, and output the stepped-down photovoltaic power to the bidirectional OBC module 800.

[0144] refer to Figure 7 , Figure 7 This is a circuit diagram of the third embodiment of the vehicle-mounted energy storage system of the present application. Figure 7 The schematic circuit diagrams shown may include a schematic circuit diagram of a bidirectional DCDC module 700 and a schematic circuit diagram of a bidirectional OBC module 800 . Figure 7In the embodiment, the bidirectional DCDC module 700 includes: an eleventh MOS transistor Q11, a twelfth MOS transistor Q12, a thirteenth MOS transistor Q13, a fourteenth MOS transistor Q14, a fifteenth MOS transistor Q15, a sixteenth MOS transistor Q16, a seventeenth MOS transistor Q17, an eighteenth MOS transistor Q18, a fourth capacitor C4, a fifth capacitor C5, a fourth transformer coil N4, and a fifth transformer coil N5;

[0145] The first end of the fourth transformer coil N4 is respectively connected to the drain of the eleventh MOS tube Q11 and the source of the twelfth MOS tube Q12, the second end of the fourth transformer coil N4 is respectively connected to the source of the thirteenth MOS tube Q13 and the drain of the fourteenth MOS tube Q14, the drain of the twelfth MOS tube Q12, the drain of the thirteenth MOS tube Q13 and the first end of the fourth capacitor C4 are all connected to the output end of the fourth switch tube S4, the source of the eleventh MOS tube Q11, the source of the fourteenth MOS tube Q14 and the second end of the fourth capacitor C4 are all connected to the second end of the vehicle-mounted high-voltage battery 600.

[0146] The first end of the fifth transformer coil N5 is respectively connected to the source of the fifteenth MOS transistor Q15 and the drain of the sixteenth MOS transistor Q16, the second end of the fifth transformer coil N5 is respectively connected to the source of the seventeenth MOS transistor Q17 and the drain of the eighteenth MOS transistor Q18, the drain of the fifteenth MOS transistor Q15 and the drain of the seventeenth MOS transistor Q17 are both connected to the first end of the fifth capacitor C5, and the source of the sixteenth MOS transistor Q16 and the source of the eighteenth MOS transistor Q18 are both connected to the second end of the fifth capacitor C5.

[0147] It should be noted that the gates of the eleventh MOS tube Q11, the twelfth MOS tube Q12, the thirteenth MOS tube Q13, the fourteenth MOS tube Q14, the fifteenth MOS tube Q15, the sixteenth MOS tube Q16, the seventeenth MOS tube Q17 and the eighteenth MOS tube Q18 can all be connected to the control module 100, and their opening and closing are controlled by the control module 100.

[0148] It can be understood that, when stepping down the voltage, the fourth transformer coil N4 can be used as the primary side, and the fifth transformer coil can be used as the secondary side. On the primary side, the control module 100 can output corresponding PWM signals to control the eleventh MOS tube Q11, the twelfth MOS tube Q12, the thirteenth MOS tube Q13 and the fourteenth MOS tube Q14 to be periodically turned on and off. On the secondary side, the control module 100 can output corresponding PWM signals to control the fifteenth MOS tube Q15, the sixteenth MOS tube Q16, the seventeenth MOS tube Q17 and the eighteenth MOS tube Q18 to be periodically turned on and off. The duty cycle of the PWM signal is controlled to step down the high-voltage photovoltaic power to obtain the stepped-down photovoltaic power.

[0149] The bidirectional OBC module 800 is used to convert the stepped-down photovoltaic power into AC power, and supply power to an external load through the AC power.

[0150] In a specific implementation, since the electric energy required by the external load is AC power, the bidirectional OBC module 800 can convert the DC-type stepped-down photovoltaic electric energy into AC power to supply power to the external load through the AC power.

[0151] like Figure 7 As shown, the bidirectional DCDC module 800 includes: a nineteenth MOS transistor Q19, a twentieth MOS transistor Q20, a twenty-first MOS transistor Q21, a twenty-second MOS transistor Q22, a third inductor L3 and a sixth capacitor C6.

[0152] The first end of the sixth capacitor C65 is respectively connected to the first end of the fifth capacitor C5, the drain of the nineteenth MOS transistor Q19, and the drain of the twentieth MOS transistor Q20; the second end of the sixth capacitor C6 is respectively connected to the source of the twenty-first MOS transistor Q21 and the source of the twenty-second MOS transistor Q22; the source of the nineteenth MOS transistor Q19 is respectively connected to the drain of the twenty-first MOS transistor Q21 and the first end of the AC interface 900; the source of the twentieth MOS transistor Q20 is respectively connected to the drain of the twenty-second MOS transistor Q22 and the first end of the third inductor L3; and the second end of the third inductor L3 is connected to the second end of the AC interface 900.

[0153] It should be noted that the gates of the nineteenth MOS transistor Q19 , the twentieth MOS transistor Q20 , the twenty-first MOS transistor Q21 , and the twenty-second MOS transistor Q22 may all be connected to the control module 100 , and their opening and closing are controlled by the control module 100 .

[0154] It is understandable that the above-mentioned external load can be connected to the bidirectional OBC module 800 through the AC interface 900, and the above-mentioned control module 100 can output corresponding PWM signals to control the nineteenth MOS tube Q19, the twentieth MOS tube Q20, the twenty-first MOS tube Q21, and the twenty-second MOS tube Q22 to periodically open and close, so as to convert the DC-formed stepped-down photovoltaic power into AC power, and output the AC power to the external load through the AC interface 900 to power the external load.

[0155] It should be noted that the on-board high-voltage battery 600 can also output AC power to the outside through the bidirectional DCDC module 700 and the bidirectional OBC module 800 to power external loads.

[0156] In addition, when the AC interface 900 is connected to a power supply device, such as a charging pile, the bidirectional OBC module 800 can receive the power supply energy in the form of AC output by the power supply device. The above-mentioned nineteenth MOS tube Q19, the twentieth MOS tube Q20, the twenty-first MOS tube Q21, and the twenty-second MOS tube Q22 can constitute an AC-to-DC circuit to convert the charging energy into DC power supply energy and output it to the bidirectional DCDC module 700. The bidirectional DCDC module 700 boosts the DC power supply energy through the eleventh MOS tube Q11, the twelfth MOS tube Q12, the thirteenth MOS tube Q13 and the fourteenth MOS tube Q14, the fifteenth MOS tube Q15, the sixteenth MOS tube Q16, the seventeenth MOS tube Q17, the eighteenth MOS tube Q18, the fourth capacitor C4, the fifth capacitor C5, the fourth transformer coil N4, and the fifth transformer coil N5 to obtain the boosted power supply energy, and outputs the boosted power supply energy to the on-board high-voltage battery 600 to charge the on-board high-voltage battery 600.

[0157] It should be noted that when the vehicle is not running, the on-board high-voltage battery 600 does not need to be charged and the AC interface 900 is connected to a load that needs to be powered, or when the user chooses to be powered only by the photovoltaic energy collection system 400, the above-mentioned bidirectional DCDC module 700 and the above-mentioned bidirectional OBC module 800 are connected in parallel with the on-board high-voltage battery 600 through the third switch tube S3 and the fourth switch tube S4. When the third switch tube S3 is disconnected and the fourth switch tube S4 is closed, the power supply function of the on-board high-voltage battery 600 can be inactivated, and the photovoltaic energy collection system 400 outputs AC power to power the external load through the bidirectional DCDC module 700 and the bidirectional OBC module 800, so that external power supply can be achieved with zero loss of the on-board high-voltage battery. In this process, the step-down power of the bidirectional DCDC module 700 can be controlled not to be greater than the output power of the photovoltaic energy collection system 400 to avoid the on-board low-voltage battery 300 from running out of power.

[0158] It is understandable that when the power of the photovoltaic energy collection system 400 is large enough, such as reaching 2kW, and the discharge power of the on-board high-voltage battery 600 is limited to a certain extent, such as being limited to 1.2kW, the on-board high-voltage battery 600 can be charged by the photovoltaic energy collection system 400, and the photovoltaic energy collection system 400 supplies power to the external load at the same time. When the photovoltaic energy collection system 400 charges the on-board high-voltage battery 600 and supplies power to the external load at the same time, the sum of the charging power of the on-board high-voltage battery 600 and the AC discharge power of the bidirectional OBC module 800 can be controlled to be lower than the output power of the photovoltaic energy collection system 400 to avoid the on-board low-voltage battery 300 from running out of power.

[0159] It should be noted that by integrating the photovoltaic energy collection system 400 with the vehicle-mounted energy storage system in the above manner, the photovoltaic energy collection system 400 can independently supply power to the vehicle-mounted low-voltage battery 300, independently supply power to external loads, independently charge the vehicle-mounted high-voltage battery 600, or combine them according to the output power of the photovoltaic energy collection system 400, thereby maximizing the power generation of the photovoltaic energy collection system 400 and effectively improving the overall system efficiency of the vehicle-mounted energy storage system.

[0160] In addition, the present application also provides a car, which includes the on-board energy storage system as described in the above embodiment.

[0161] The automobile provided by the present application, including the on-board energy storage system in the above-mentioned embodiment, can solve the technical problem that after adding an additional photovoltaic energy storage battery in the prior art, a corresponding low-voltage line needs to be separately designed for energy transmission, resulting in increased component costs. Compared with the prior art, the beneficial effects of the automobile provided by the present application are the same as the beneficial effects of the on-board energy storage system provided by the above-mentioned embodiment, and the other technical features of the automobile are the same as the features disclosed in the above-mentioned embodiment, which will not be repeated here.

[0162] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A vehicle-mounted energy storage system, characterized in that: The system comprises: a control module, a first voltage conversion module and a vehicle-mounted low-voltage battery; The first voltage conversion module is respectively connected to the control module, the vehicle-mounted low-voltage battery and the photovoltaic energy collection system; The control module is used to control the connection state between the photovoltaic energy collection system and the first voltage conversion module; The photovoltaic energy collection system is used to output photovoltaic power to the first voltage conversion module when connected to the first voltage conversion module; The first voltage conversion module is used to step down the photovoltaic power to obtain low-voltage photovoltaic power that matches the voltage platform of the on-board low-voltage battery; The first voltage conversion module is further used to output the low-voltage photovoltaic power to the on-board low-voltage battery for storage when the on-board low-voltage battery is not supplying power to the outside.

2. The vehicle-mounted energy storage system according to claim 1, characterized in that: The system further comprises: a first bidirectional switch unit; The first bidirectional switch unit is provided with a first switch tube; The control end of the first switch tube is connected to the control module, the input end of the first switch tube is connected to the photovoltaic energy collection system, and the output end of the first switch tube is connected to the first voltage conversion module; The control module is further used to connect the photovoltaic energy collection system to the first voltage conversion module by controlling the first switch tube to close.

3. The vehicle-mounted energy storage system according to claim 2, characterized in that: The first voltage conversion module includes: a first MOS tube, a second MOS tube, a first inductor, a first capacitor and a second capacitor; The drain of the first MOS tube is connected to the first end of the vehicle-mounted low-voltage battery and the first end of the first capacitor respectively, the source of the first MOS tube is connected to the first end of the first inductor, the second end of the first inductor is respectively connected to the source of the second MOS tube, the first end of the second capacitor and the output end of the first switch tube, the drain of the second MOS tube, the second end of the second capacitor and the second end of the first capacitor are all connected to the second end of the vehicle-mounted low-voltage battery.

4. The vehicle-mounted energy storage system according to claim 2, characterized in that: The system further includes: a second voltage conversion module, a second bidirectional switch unit and an on-vehicle high-voltage battery; The first bidirectional switch unit is also provided with a second switch tube; The second bidirectional switch unit is provided with a third switch tube; The control end of the second switch tube is connected to the control module, the input end of the second switch tube is respectively connected to the photovoltaic energy collection system and the input end of the first switch tube, the output end of the second switch tube is connected to the second voltage conversion module, the control end of the third switch tube is connected to the control module, the input end of the third switch tube is connected to the second voltage conversion module, and the output end of the third switch tube is connected to the first end of the vehicle-mounted high-voltage battery; The control module is further used to control the second switch tube and the third switch tube to be closed, so that the photovoltaic energy collection system is connected to the vehicle-mounted high-voltage battery through the second voltage conversion module; The photovoltaic energy collection system is further used to output the photovoltaic power to the second voltage conversion module when connected to the second voltage conversion module; The second voltage conversion module is also used to boost the photovoltaic power when connected to the on-board high-voltage battery to obtain high-voltage photovoltaic power, and pre-charge the on-board high-voltage battery through the high-voltage photovoltaic power.

5. The vehicle-mounted energy storage system according to claim 4, characterized in that: The control module is further used to control the first switch tube and the second switch tube to be closed, so as to connect the first voltage conversion module to the second voltage conversion module; The first voltage conversion module is further used to, when connected to the second voltage conversion module and receiving the low-voltage battery power output by the on-board low-voltage battery, boost the low-voltage battery power to obtain the first boosted battery power; The first voltage conversion module is further used to output the first boosted battery electric energy to the second voltage conversion module; The second voltage conversion module is used to boost the first boosted battery power to obtain second boosted battery power when connected to the vehicle-mounted high-voltage battery; The second voltage conversion module is also used to pre-charge the vehicle-mounted high-voltage battery through the second boosted battery power.

6. The vehicle-mounted energy storage system according to claim 5, characterized in that: The second voltage conversion module is further used to, when connected to the first voltage conversion module and receiving the high-voltage battery power output by the vehicle-mounted high-voltage battery, perform voltage reduction processing on the high-voltage battery power to obtain first voltage-reduced battery power; The second voltage conversion module is further used to output the first stepped-down battery electric energy to the first voltage conversion module; The first voltage conversion module is further used to perform voltage reduction processing on the first voltage-reduced battery power to obtain second voltage-reduced battery power; The first voltage conversion module is further used to supply power to the on-board low-voltage battery through the second stepped-down battery power when the on-board low-voltage battery supplies power to the outside.

7. The vehicle-mounted energy storage system according to claim 6, characterized in that: The second voltage conversion module includes: a third MOS tube, a fourth MOS tube, a fifth MOS tube, a sixth MOS tube, a seventh MOS tube, an eighth MOS tube, a ninth MOS tube, a tenth MOS tube, a second inductor, a first transformer coil, a second transformer coil, a third transformer coil and a third capacitor; The first end of the first transformer coil is connected to the drain of the third MOS tube and the drain of the fourth MOS tube respectively, the second end of the first transformer coil is connected to the first end of the second inductor and the first end of the second transformer coil respectively, and the second end of the second inductor is connected to the output end of the second switch tube; The second end of the second transformer coil is respectively connected to the drain of the fifth MOS tube and the drain of the sixth MOS tube, and the source of the third MOS tube, the source of the fourth MOS tube, the source of the fifth MOS tube and the source of the sixth MOS tube are all connected to the second end of the on-board low-voltage battery; The first end of the third transformer coil is respectively connected to the source of the seventh MOS tube and the drain of the eighth MOS tube, and the second end of the third transformer coil is respectively connected to the source of the ninth MOS tube and the drain of the tenth MOS tube; The first end of the third capacitor is respectively connected to the drain of the seventh MOS tube, the drain of the ninth MOS tube and the input end of the third switch tube, and the second end of the third capacitor is respectively connected to the source of the eighth MOS tube, the source of the tenth MOS tube and the second end of the vehicle-mounted high-voltage battery.

8. The vehicle-mounted energy storage system according to any one of claims 3 to 6, characterized in that: The system further comprises: a bidirectional DCDC module and a bidirectional OBC module; The second bidirectional switch unit is also provided with a fourth switch tube; The control end of the fourth switch tube is connected to the control module, the input end of the fourth switch tube is connected to the input end of the third switch tube, the output end of the fourth switch tube is connected to the bidirectional DCDC module, and the bidirectional DCDC module is respectively connected to the bidirectional OBC module and the on-board high-voltage battery; The control module is further used to connect the second voltage conversion module to the bidirectional DCDC module by controlling the fourth switch tube to close when the second voltage conversion module is connected to the vehicle-mounted high-voltage battery; The second voltage conversion module is further used to output the high-voltage photovoltaic power obtained by the boosting process to the bidirectional DCDC module when connected to the bidirectional DCDC module; The bidirectional DCDC module is used to step down the high-voltage photovoltaic power to obtain stepped-down photovoltaic power, and output the stepped-down photovoltaic power to the bidirectional OBC module; The bidirectional OBC module is used to convert the stepped-down photovoltaic power into AC power, and supply power to an external load through the AC power.

9. The vehicle-mounted energy storage system according to claim 8, characterized in that: The bidirectional DCDC module includes: an eleventh MOS tube, a twelfth MOS tube, a thirteenth MOS tube, a fourteenth MOS tube, a fifteenth MOS tube, a sixteenth MOS tube, a seventeenth MOS tube, an eighteenth MOS tube, a fourth capacitor, a fifth capacitor, a fourth transformer coil, and a fifth transformer coil; The bidirectional DCDC module includes: a nineteenth MOS tube, a twentieth MOS tube, a twenty-first MOS tube, a twenty-second MOS tube, a third inductor and a sixth capacitor; The first end of the fourth transformer coil is respectively connected to the drain of the eleventh MOS tube and the source of the twelfth MOS tube, the second end of the fourth transformer coil is respectively connected to the source of the thirteenth MOS tube and the drain of the fourteenth MOS tube, the drain of the twelfth MOS tube, the drain of the thirteenth MOS tube and the first end of the fourth capacitor are all connected to the output end of the fourth switch tube, the source of the eleventh MOS tube, the source of the fourteenth MOS tube and the second end of the fourth capacitor are all connected to the second end of the vehicle-mounted high-voltage battery; The first end of the fifth transformer coil is respectively connected to the source of the fifteenth MOS tube and the drain of the sixteenth MOS tube, the second end of the fifth transformer coil is respectively connected to the source of the seventeenth MOS tube and the drain of the eighteenth MOS tube, the drain of the fifteenth MOS tube and the drain of the seventeenth MOS tube are both connected to the first end of the fifth capacitor, and the source of the sixteenth MOS tube and the source of the eighteenth MOS tube are both connected to the second end of the fifth capacitor; The first end of the sixth capacitor is respectively connected to the first end of the fifth capacitor, the drain of the nineteenth MOS tube and the drain of the twentieth MOS tube, the second end of the sixth capacitor is respectively connected to the source of the twenty-first MOS tube and the source of the twenty-second MOS tube, the source of the nineteenth MOS tube is respectively connected to the drain of the twenty-first MOS tube and the first end of the AC interface, the source of the 20th MOS tube is respectively connected to the drain of the twenty-second MOS tube and the first end of the third inductor, and the second end of the third inductor is connected to the second end of the AC interface.

10. An automobile, characterized in that: The automobile comprises the on-vehicle energy storage system as claimed in any one of claims 1 to 9.

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