Low-voltage power supply system and vehicle

Abstract

The utility model provides a low-voltage power supply system and a vehicle, and the system comprises a power battery which is used for providing a power supply for a first load and / or a second load; the first end of the DC conversion circuit is connected with the second end of the power battery, and the DC conversion circuit is used for supplying power to the first load and / or the second load when the vehicle is in different gears. Through high integration of the power battery and the DC conversion circuit and the connection relation between the power battery and the DC conversion circuit, a traditional lead-acid battery is replaced, and a vehicle power supply circuit is simplified, so that power supply voltage requirements of different loads under different gears of a vehicle are met, for example, 12V and 24V are adapted to power supply of the vehicle, the number of 24V low-voltage loads can be reduced, and the cost is reduced. And the vehicle manufacturing cost and the power utilization cost are reduced, for example, parts such as a shell and a wire harness are reduced, the risk of power shortage of the whole vehicle is reduced, the system better conforms to the industrial chain of a company, the weight of the whole vehicle is effectively reduced, and pollution to the environment is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle technical field especially is related to a low voltage power supply system and vehicle. BACKGROUND

[0002] The design of the power supply system is very important for guaranteeing the use and control manufacturing cost of the vehicle, in the related technology, taking the power supply system of the electric light truck as an example, currently, 24V lead-acid battery is generally used as starting battery for the low voltage power supply of the whole vehicle and the control starting of the vehicle.

[0003] However, by using the above mode, there are problems of the power supply system not adapting 12V electric light truck, the pollution of lead-acid battery to the environment being heavy, the integration of the power supply system being low, more parts being used, the manufacturing cost being high and the like. UTILITY MODEL CONTENTS

[0004] The utility model aims at at least solving one of the technical problems in the prior art.

[0005] Therefore, one purpose of the utility model is to provide a low voltage power supply system, which adapts 12V and 24V for the power supply of the vehicle, uses non-lead-acid battery to reduce the pollution to the environment, improves the integration of the system and reduces the manufacturing cost.

[0006] Therefore, a second purpose of the utility model is to provide a vehicle.

[0007] In order to achieve the above purpose, an embodiment of the first aspect of the utility model provides a low voltage power supply system, which comprises: a power battery for providing power supply for a first load and / or a second load; a DC conversion circuit, the first end of the DC conversion circuit is connected to the second end of the power battery, for supplying power for the first load and / or the second load when the vehicle is in different gears.

[0008] The low voltage power supply system according to the embodiment of the utility model provides power supply for the first load and / or the second load through the power battery, is highly integrated with the DC conversion circuit, combines the connection relationship therebetween, cancels the external starting battery, takes N battery cores from the power battery to form a power supply battery core as a starting battery module, and sets the DC conversion circuit to supply low voltage, replaces the traditional lead-acid battery and simplifies the vehicle power supply circuit, so as to realize the power supply voltage demand of different loads under different gears of the vehicle, for example, adapting 12V and 24V for the power supply of the vehicle, which can reduce the number of 24V low voltage loads, reduce the manufacturing cost and electricity cost of the vehicle, for example, reduces the shell, wire harness and other parts, reduces the risk of power loss of the whole vehicle, is more in line with the company's industrial chain, effectively reduces the weight of the whole vehicle and reduces the pollution to the environment.

[0009] In some embodiments, the power battery comprises: a power supply cell, a positive electrode of the power supply cell is connected to a seventh end of the DC conversion circuit, for supplying power to the first load and / or the second load when the vehicle is in OFF gear.

[0010] In some embodiments, the DC conversion circuit comprises: a step-down DC sub-circuit, a first end of the step-down DC sub-circuit is connected to a positive electrode of a power supply cell, for supplying power to the first load when the vehicle is in OFF gear.

[0011] In some embodiments, the step-down DC sub-circuit comprises: a MOS switch tube, a drain of the MOS switch tube is connected to a positive electrode of the power supply cell; an inductor, one end of the inductor is connected to a source of the MOS switch tube; a diode, a negative electrode of the diode is connected to one end of the inductor, and a positive electrode of the diode is grounded; a capacitor, one end of the capacitor is connected to the other end of the inductor, and the other end of the capacitor is connected to the positive electrode of the diode; a triode, a first end of the triode is connected to the other end of the inductor, and a second end of the triode is grounded.

[0012] In some embodiments, the DC conversion circuit comprises: a vehicle-mounted DC sub-circuit group, a first end of the vehicle-mounted DC sub-circuit group is connected to a second end of the power battery, a second end of the vehicle-mounted DC sub-circuit group is connected to the second load, and a third end of the vehicle-mounted DC sub-circuit group is connected to the first load, for supplying power to the first load and / or the second load when the vehicle is in ON gear.

[0013] In some embodiments, the vehicle-mounted DC sub-circuit group comprises: a first vehicle-mounted DC sub-circuit, a first end of the first vehicle-mounted DC sub-circuit is connected to the second end of the power battery, and a third end of the first vehicle-mounted DC sub-circuit is grounded, for supplying power to the first load; a second vehicle-mounted DC sub-circuit, a first end of the second vehicle-mounted DC sub-circuit is connected to the second end of the power battery, a second end of the second vehicle-mounted DC sub-circuit is connected to a positive electrode of the power supply cell, and a third end of the second vehicle-mounted DC sub-circuit is connected to a second end of the first vehicle-mounted DC sub-circuit, for supplying power to the second load together with the first vehicle-mounted DC sub-circuit.

[0014] In some embodiments, the low-voltage power supply system further comprises: a battery management system, one end of the battery management system is connected to the first end of the power battery, for monitoring the operating state of the power battery.

[0015] In some embodiments, the low-voltage power supply system further comprises: a first safety circuit, one end of the first safety circuit is connected to the second end of the first vehicle-mounted DC sub-circuit, and the other end of the first safety circuit is connected to the first load.

[0016] In some embodiments, the low-voltage power supply system further comprises a second safety circuit, one end of the second safety circuit is connected to the second end of the second vehicle-mounted DC sub-circuit, and the second end of the second safety circuit is connected to the second load.

[0017] To achieve the above object, the second aspect of the embodiment of the utility model provides a vehicle, the vehicle comprises: the low-voltage power supply system as described in the above embodiment.

[0018] According to the vehicle of the utility model embodiment, the power battery provides the power supply for the first load and / or the second load, is highly integrated with DC conversion circuit, combines the connecting relationship between them, and wherein the external starting battery is cancelled, and the power battery is taken N electric core groups to form the power supply electric core as the starting battery module, and the DC conversion circuit is arranged to carry out low-voltage power supply, replaces the traditional lead-acid battery and simplifies the vehicle power supply circuit, to realize the power supply voltage demand of different loads under different gears of compatible vehicle, for example, for the power supply adaptation 12V and 24V of vehicle, can reduce the number of 24V low-voltage load, reduces the manufacturing cost and electricity cost of vehicle, for example, reduces the shell, wire harness and other parts, reduces the risk of power loss of the whole vehicle, is more in line with the company's industrial chain, effectively reduces the weight of the whole vehicle, reduces the pollution to the environment.

[0019] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and / or additional aspects and advantages of the utility model will become apparent and more readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0021] Figure 1 It is the low-voltage power supply system block diagram according to one embodiment of the utility model;

[0022] Figure 2 It is the low-voltage power supply system circuit schematic diagram according to one embodiment of the utility model;

[0023] Figure 3 It is the low-voltage power supply system control flow chart according to one embodiment of the utility model;

[0024] Figure 4 It is the vehicle block diagram according to one embodiment of the utility model.

[0025] REFERENCE NUMERALS:

[0026] Ground 45;Positive pole of power supply electric core 46;Seventh end of DC conversion circuit 47;Second end of power battery 48;

[0027] DC conversion circuit 49; second safety circuit 69; first safety circuit 70; first load 72; second load 71;

[0028] High-voltage power distribution unit 50; battery management system 51; power battery 52; second DC 54; first DC 55; 24V fuse box 56; 24V load 57; 12V fuse box 58; 12V load 59; power supply cell 60; MOS switch tube 61; inductor 62; diode 63; capacitor 64; triode 65;

[0029] Buck DC sub-circuit 53; vehicle-mounted DC sub-circuit group 66;

[0030] First vehicle-mounted DC sub-circuit 68; second vehicle-mounted DC sub-circuit 67;

[0031] Low-voltage power supply system 100;

[0032] Vehicle 99. DETAILED DESCRIPTION

[0033] The embodiments described with reference to the drawings are exemplary, and the embodiments of the utility model are described in detail below.

[0034] The design of the power supply system is very important for ensuring the use and control of the vehicle manufacturing cost, in the related art, for example, in the transportation industry, electric light trucks are more and more popular, and at present, the power supply system of the electric light truck generally uses 24V lead-acid battery as the starting battery, and uses lithium battery management system (LBMS) for management to complete the low-voltage power supply of the whole vehicle and complete the starting of the vehicle.

[0035] However, the above-mentioned lead-acid battery will cause great pollution to the environment, and has low safety and short service life. In addition, considering the maturity and cost of the industry chain, it is selected to retain 12V low-voltage load on the electric light truck model, which makes the whole vehicle have 24V and 12V low-voltage power supply demand at the same time, but the above-mentioned scheme can only meet the 24V low-voltage power supply demand, and the integration of the above-mentioned power supply system is low and the cost is high.

[0036] Therefore, the low-voltage power supply system of this utility model provides power to the first load and / or the second load through the power battery and is highly integrated with the DC conversion circuit. Considering the connection relationship between them, and the elimination of the external starting battery, N cells are taken from the power battery to form a power supply cell module as the starting battery, and a DC conversion circuit is set up for low-voltage power supply. This replaces the traditional lead-acid battery and simplifies the vehicle power supply circuit, achieving compatibility with the power supply voltage requirements of different loads under different vehicle gears. For example, for the vehicle's power supply, it can adapt to 12V and 24V, reducing the number of 24V low-voltage loads, lowering vehicle manufacturing costs and electricity costs. For example, it reduces the number of components such as the casing and wiring harness, reducing the risk of the vehicle running out of power, better aligning with the company's industrial chain, effectively reducing the overall vehicle weight, and mitigating environmental pollution.

[0037] The following is combined Figures 1-3 This invention describes a low-voltage power supply system according to an embodiment of the present invention.

[0038] like Figure 1 The diagram shown is a block diagram of a low-voltage power supply system according to an embodiment of the present invention. The low-voltage power supply system 100 of this embodiment includes at least: a power battery 52 and a DC (Direct Current) conversion circuit 49. The first terminal of the DC conversion circuit 49 is connected to the second terminal 48 of the power battery. The power battery 52 is used to provide power to a first load and / or a second load. The DC conversion circuit 49 is used to supply power to the first load and / or the second load when the vehicle is in different gears.

[0039] In the embodiment, the power battery 52, for example, a power battery pack, refers to a battery assembly composed of a plurality of single batteries, capable of providing electrical energy and stored in the vehicle, mainly used for providing continuous power output and driving capability for the vehicle; the first load is a load requiring 12V power supply; the second load is a load requiring 24V power supply; the different gears include ON gear and OFF gear; the DC conversion circuit 49 includes a 24V-to-12V step-down DC circuit and two 12V DC converters, and the step-down DC circuit is used for step-down; the power battery 52 is used to provide power supply for the first load and / or the second load in the low-voltage power supply system, that is, to provide power supply for the load requiring 12V power supply and the load requiring 24V power supply; the DC conversion circuit 49 is used to supply power to the first load and / or the second load when the vehicle is in different gears. Specifically, the power battery 52 includes N battery cells, which constitute a power supply cell as a starting battery module, and N is determined according to demand and experimental calibration, for example, N can be 8. In addition, the starting battery module is not limited to taking the power supply cell from the power battery 52, but can also use a separately arranged power supply cell as the starting battery module. Taking the power supply cell from the power battery 52 as the starting battery module is to improve the integration, so that the power battery is reused as the starting battery module, and the cost is reduced. When it is judged that the vehicle is in OFF gear, the starting battery module is started to supply power to the 24V load, and at the same time supply power to the 12V load through the 24V-to-12V step-down DC circuit. When it is judged that the vehicle is in ON gear high-voltage power-on, the power battery 52 completes the power supply to the 24V load through the series connection of the two 12V DC converters, one of which supplies power to the 12V load alone, and at the same time, the two 12V DC converters also charge the starting battery module. Through the connection relationship between the highly integrated power battery and the DC conversion circuit, and the cancellation of the external starting battery, N battery cells are taken from the power battery to constitute a power supply cell as a starting battery module, and a DC conversion circuit is arranged for low-voltage power supply, replacing the traditional lead-acid battery and simplifying the vehicle power supply circuit, to realize the compatibility of different power supply voltages under different gears of the vehicle, for example, adapting 12V and 24V for vehicle power supply, which can reduce the number of 24V low-voltage loads, reduce the vehicle manufacturing cost and power consumption cost, for example, reduce the shell, wire harness and other parts, reduce the risk of power loss of the whole vehicle, and be more in line with the company's industrial chain, effectively reduce the weight of the whole vehicle, and reduce the pollution to the environment.

[0040] The low-voltage power supply system according to the embodiment of the utility model, through the power battery provides the power supply power for the first load and / or the second load, and is highly integrated with the DC conversion circuit, the connection relationship between the combination, and wherein the external starting battery is cancelled, N battery cores in the power battery are taken to form a power supply core as a starting battery module, and the DC conversion circuit is arranged to supply low-voltage power, which replaces the traditional lead-acid battery and simplifies the vehicle power supply circuit, so as to realize the power supply voltage demand of different loads under different gears of the compatible vehicle, for example, for the power supply adaptation of the vehicle 12V and 24V, the number of 24V low-voltage loads can be reduced, the vehicle manufacturing cost and the power consumption cost are reduced, for example, the shell, wire harness and other parts are reduced, the risk of power loss of the whole vehicle is reduced, it is more in line with the company's industrial chain, the weight of the whole vehicle is effectively reduced, and the pollution to the environment is reduced.

[0041] In some embodiments, as shown in Figure 2 The power battery 52 includes a power supply core 60, and a positive electrode 46 of the power supply core is connected with a seventh end 47 of a DC conversion circuit, so as to supply power for the first load 72 and the second load 71 when the vehicle is in an OFF gear.

[0042] In the embodiment, the power battery 52, for example, a power battery pack, refers to a battery assembly composed of a plurality of single batteries, can provide electrical energy and store in the vehicle, and is mainly used for providing continuous power output and driving ability for the vehicle; the battery core is a basic power supply unit in the power battery pack of the vehicle, is a single energy storage unit in the battery, can independently complete the charging and discharging process, the power supply core 60 is composed of N battery cores, N is determined by demand and experimental calibration, and can be 8; the OFF gear represents a closed or stopped state, in this gear, all power supplies of the vehicle will be closed, and is usually used for closing the vehicle power supply after parking; the first load 72 is a load requiring 12V power supply; the second load 71 is a load requiring 24V power supply; specific N battery cores in the power battery pack are taken to form the power supply core 60 as a starting battery of the low-voltage power supply system 100, the positive electrode 46 of the power supply core is connected with the seventh end 47 of the DC conversion circuit, so as to not only participate in the external discharging and charging work of the power battery 52, but also work together with the DC conversion circuit 49, form a starting battery system of the vehicle, and supply power for the first load 72 and the second load 71 when the vehicle is in the OFF gear, for example, provide 24V and 12V voltage for the low-voltage power consumption equipment in the low-power state under the OFF gear. And the power battery 52 can use the iron lithium battery, is not limited to use the lead-acid battery, and the pollution to the environment is reduced.

[0043] In some embodiments, as shown in Figure 2As shown, the DC conversion circuit 49 includes a step-down DC sub-circuit 53, a first end of the step-down DC sub-circuit 53 being connected to the positive pole 46 of the power supply battery, for supplying power to the first load 72 when the vehicle is in the OFF gear.

[0044] In an embodiment, the DC conversion circuit 49 includes the step-down DC sub-circuit 53, which is a step-down DC circuit for converting 24V to 12V, a first end of the step-down DC sub-circuit 53 being connected to the positive pole 46 of the power supply battery, when it is judged that the vehicle is in the OFF gear, the power supply battery 60 is started to be turned on, and the first load 72 is supplied with power through the step-down DC sub-circuit 53, for example, a 12V load is supplied with power, and at the same time, the power supply battery 60 can also supply power to the second load 71, for example, a 24V load is supplied with power, so as to realize the supply of power to the 12V load through the DC conversion circuit 49, so that the 12V low-voltage load can be retained on the electric light truck, the battery cost and the power consumption cost are reduced, and it is more in line with the company's industrial chain.

[0045] In some embodiments, as shown in Figure 2 As shown, the step-down DC sub-circuit 53 includes a MOS switch tube (Metal-Oxide-Semiconductor Field-Effect Transistor) 61, a drain of the MOS switch tube 61 being connected to the positive pole 46 of the power supply battery; an inductor 62, one end of the inductor 62 being connected to a source of the MOS switch tube 61; a diode 63, a negative pole of the diode 63 being connected to one end of the inductor 62, and a positive pole of the diode 63 being connected to the ground 45; a capacitor 64, one end of the capacitor 64 being connected to the other end of the inductor 62, and the other end of the capacitor 64 being connected to the positive pole of the diode 63; a triode 65, a first end of the triode 65 being connected to the other end of the inductor 62, and a second end of the triode 65 being connected to the ground 45.

[0046] In an embodiment, the step-down DC sub-circuit 53 includes the MOS switch tube 61, the inductor 62, the capacitor 64 and the triode 65, the step-down DC sub-circuit 53 being different from the vehicle-mounted DC, the vehicle-mounted DC being converted from the high voltage of several hundred volts of the power battery pack to the low voltage of 12V, here, only the MOS switch tube 61 and the triode 65 and other components are used to realize the function of voltage halving, so as to save the cost while realizing the step-down.

[0047] In some embodiments, as shown in Figure 2 As shown, the DC conversion circuit 49 includes a vehicle-mounted DC sub-circuit group 66, a first end of the vehicle-mounted DC sub-circuit group 66 being connected to the second end 48 of the power battery, a second end of the vehicle-mounted DC sub-circuit group 66 being connected to the second load 71, and a third end of the vehicle-mounted DC sub-circuit group 66 being connected to the first load 72, for supplying power to the first load 72 and the second load 71 when the vehicle is in the ON gear.

[0048] In embodiments, the ON gear is a gear for powering all electrical appliances in the vehicle; the DC conversion circuit 49 comprises: a vehicle-mounted DC sub-circuit group 66, when it is judged that the vehicle is powered on in the ON gear, the power battery 52 completes power supply to the first load 72 and the second load 71 through the vehicle-mounted DC sub-circuit group 66, for example, power supply to 12V and 24V loads, so that the power supply to the vehicle is compatible with different voltages, for example, compatible with the original 12V low-voltage load power supply of the electric light truck, which improves the applicability of the power supply system and saves costs.

[0049] In some embodiments, as shown in Figure 2 The vehicle-mounted DC sub-circuit group 66 comprises: a first vehicle-mounted DC sub-circuit 68, a first end of the first vehicle-mounted DC sub-circuit 68 being connected to the second end 48 of the power battery, a third end of the first vehicle-mounted DC sub-circuit 68 being grounded 45, for powering the first load 72; and a second vehicle-mounted DC sub-circuit 67, a first end of the second vehicle-mounted DC sub-circuit 67 being connected to the second end 48 of the power battery, a second end of the second vehicle-mounted DC sub-circuit 67 being connected to the positive electrode 46 of the power supply cell, a third end of the second vehicle-mounted DC sub-circuit 67 being connected to the second end of the first vehicle-mounted DC sub-circuit 68, for powering the second load 71 together with the first vehicle-mounted DC sub-circuit 68.

[0050] In embodiments, as shown in Figure 2 The vehicle-mounted DC sub-circuit group 66 comprises the first vehicle-mounted DC sub-circuit 68 and the second vehicle-mounted DC sub-circuit 67, the first vehicle-mounted DC sub-circuit 68 comprising a first DC 55, for example, a 12V DC converter, the second vehicle-mounted DC sub-circuit 67 comprising a second DC 54, for example, a 24V DC converter, when it is judged that the vehicle is powered on in the ON gear, the power battery 52 completes 24V power supply through the first DC 55 and the second DC 54 in series, that is, power supply to the first load 72, the first DC 55 alone powers the 12V load, that is, power supply to the second load 71, and at the same time, the first DC 55 and the second DC 54 also charge the starting battery. In addition, the first DC 55 and the second DC 54 are monitored to determine whether the low-voltage power supply system 100 reaches the second level of power limit due to failure of the first DC 55 or the second DC 54, if such a condition occurs, the VCU (Vehicle Control Unit) controls the vehicle low-voltage load to rapidly reduce the power to the full load power of the starting battery module, and after reaching a preset time, the vehicle power system is powered off, and the user can control the vehicle to stop safely, wherein the preset time is a value determined according to requirements and experimental calibration. Through the first vehicle-mounted DC sub-circuit 68 and the second vehicle-mounted DC sub-circuit 67 in the vehicle-mounted DC sub-circuit group 66 and the connection relationship in the circuit, 12V and 24V power supply compatible with the vehicle is realized.

[0051] In some embodiments, as shown inFigure 2 As shown, the low-voltage power supply system 100 further comprises a battery management system 51 connected to one end of the first end of the power battery 52 for monitoring the operating state of the power battery 52.

[0052] In an embodiment, the battery management system 51 (BMS) monitors the operating state of the power battery 52, determines whether the starting battery module reaches the intelligent charging threshold, and starts intelligent charging after reaching the intelligent charging threshold. After the charging is completed, the starting battery module and the step-down DC sub-circuit 53 continue to supply power to the 24 and 12V loads, respectively, wherein the intelligent charging threshold is determined according to the demand and the experiment calibration, and is a critical value for determining whether to enter the only charging process. Through the connection relationship between the battery management system and the power battery, the control of the vehicle intelligent charging, the normal operation of the low-voltage power supply system and the alarm protection strategy are realized. And the low-voltage power supply system 100 multiplexes the battery management system (BMS), without using the lithium battery management system (LBMS), saving the sampling and control unit of the original hardware part of the LBMS, and saving the manufacturing cost.

[0053] In some embodiments, as shown in Figure 2 As shown, the low-voltage power supply system 100 further comprises a first safety circuit 70 connected to one end of the second end of the first vehicle-mounted DC sub-circuit 68, and the other end of the first safety circuit 70 is connected to the first load 72.

[0054] In an embodiment, the first safety circuit 70 is a circuit for ensuring the safety of power supply to the first load 72, for example, a 12V fuse box 58, through the connection relationship between the first safety circuit and the first load, to realize the safety of 12V load power supply.

[0055] In some embodiments, as shown in Figure 2 As shown, the low-voltage power supply system 100 further comprises a second safety circuit 69 connected to one end of the second end of the second vehicle-mounted DC sub-circuit 67, and the second end of the second safety circuit 69 is connected to the second load 71.

[0056] In an embodiment, the second safety circuit 69 is a circuit for ensuring the safety of power supply to the second load 71, for example, a 24V fuse box 56, through the connection relationship between the second safety circuit and the second load, to realize the safety of 24V load power supply.

[0057] The low-voltage power supply system according to the embodiment of the utility model, through power battery provides power supply power supply for first load and / or second load, and with DC conversion circuit high integration, the connection relation between the combination, and wherein cancel the external starting battery, from power battery take N section electric core and set up DC conversion circuit to carry out low-voltage power supply, replace traditional lead-acid battery and simplify vehicle power supply circuit, to realize the power supply voltage demand of compatible vehicle different gears under different load, for example, to the power supply adaptation 12V and 24V of vehicle, can reduce 24V low-voltage load quantity, reduce vehicle manufacturing cost and power cost, for example, reduce the shell, wire harness and other parts, reduce the risk of power loss of the whole vehicle, more in line with the company's industrial chain, effectively reduce the whole vehicle weight, reduce the pollution to the environment.

[0058] Reference will now be made to Figure 3 The low-voltage power supply system control process of the embodiment of the utility model is described.

[0059] As Figure 3 The low-voltage power supply system control process of the embodiment of the utility model is described.

[0060] Step S80, start.

[0061] Step S81, judge whether the vehicle gear is ON gear. If yes, execute step S82; otherwise, execute step S86.

[0062] Step S82, start battery module and DC conversion circuit to supply power to first load and / or second load respectively.

[0063] Step S83, turn on the first DC and the second DC to supply power to the first load and / or the second load.

[0064] Step S84, judge whether the second limit power is reached. If yes, execute step S85; otherwise, execute step S82.

[0065] Step S85, the first DC and the second DC stop working, and control the vehicle to power off after reaching the preset time.

[0066] Step S86, when the vehicle gear is OFF gear, the starting battery module and the DC conversion circuit supply power to the first load and / or the second load respectively.

[0067] Step S87, judge whether the intelligent charging threshold is reached. If yes, execute step S88; otherwise, execute step S86.

[0068] Step S88, enter the intelligent charging process.

[0069] Step S89, judge whether full. If yes, execute step S86;Otherwise, execute step S88.

[0070] The following reference Figure 4 The vehicle 99 of the embodiment of the utility model is described.

[0071] As Figure 4 As shown in the figure, it is the vehicle block diagram of one embodiment of the utility model, the vehicle 99 includes: the low-voltage power supply system 100 as above-mentioned embodiment.

[0072] According to the vehicle 99 of the embodiment of the utility model, the low-voltage power supply system 100 as above-mentioned embodiment is arranged on the vehicle 99, provides the power supply source for the first load and / or second load by power battery, and is highly integrated with DC conversion circuit, combines the connecting relationship between, and wherein cancels the external starting battery, and the power battery is taken N electric core and is formed as starting battery module, and DC conversion circuit is set to carry out low-voltage power supply, replaces the traditional lead-acid battery and simplifies the vehicle power supply circuit, to realize the power supply voltage demand of different load under different gears of compatible vehicle, for example, for the power supply adaptation 12V and 24V of vehicle, can reduce the number of 24V low-voltage load, reduces the vehicle manufacturing cost and electricity cost, for example, reduces the shell, wire harness and other parts, reduces the risk of power loss of the whole vehicle, is more in line with the company's industrial chain, effectively reduces the whole vehicle weight, reduces the pollution to the environment.

[0073] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example.

[0074] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A low voltage power supply system, characterized in that The low-voltage power supply system comprises: a power battery for providing power supply for the first load and / or the second load; a DC conversion circuit, a first end of the DC conversion circuit being connected to a second end of the power battery, for providing power for the first load and / or the second load when the vehicle is in different gears.

2. The low voltage power supply system of claim 1, wherein, The power battery comprises: a power supply cell, a positive electrode of the power supply cell being connected to a seventh end of the DC conversion circuit, for providing power for the first load and / or the second load when the vehicle is in OFF gear.

3. A low voltage power supply system according to claim 1 or 2, characterized in that, The DC conversion circuit comprises: a step-down DC sub-circuit, a first end of the step-down DC sub-circuit being connected to the positive electrode of the power supply cell, for providing power for the first load when the vehicle is in OFF gear.

4. The low voltage power supply system of claim 3, wherein, The step-down DC sub-circuit comprises: a MOS switch tube, a drain of the MOS switch tube being connected to the positive electrode of the power supply cell; an inductor, one end of the inductor being connected to a source of the MOS switch tube; a diode, a negative electrode of the diode being connected to the one end of the inductor, and a positive electrode of the diode being grounded; a capacitor, one end of the capacitor being connected to the other end of the inductor, and the other end of the capacitor being grounded; a triode, a first end of the triode being connected to the other end of the inductor, and a second end of the triode being grounded.

5. The low voltage power supply system according to claim 1 or 3, characterized in that, The DC conversion circuit comprises: a vehicle-mounted DC sub-circuit group, a first end of the vehicle-mounted DC sub-circuit group being connected to the second end of the power battery, a second end of the vehicle-mounted DC sub-circuit group being connected to the second load, and a third end of the vehicle-mounted DC sub-circuit group being connected to the first load, for providing power for the first load and / or the second load when the vehicle is in ON gear.

6. The low voltage power supply system of claim 5, wherein, The vehicle-mounted DC sub-circuit group comprises: a first vehicle-mounted DC sub-circuit, a first end of the first vehicle-mounted DC sub-circuit being connected to the second end of the power battery, and a third end of the first vehicle-mounted DC sub-circuit being grounded, for providing power for the first load; a second vehicle-mounted DC sub-circuit, a first end of the second vehicle-mounted DC sub-circuit being connected to the second end of the power battery, a second end of the second vehicle-mounted DC sub-circuit being connected to the positive electrode of the power supply cell, and a third end of the second vehicle-mounted DC sub-circuit being connected to a second end of the first vehicle-mounted DC sub-circuit, for providing power for the second load together with the first vehicle-mounted DC sub-circuit.

7. The low voltage power supply system of claim 1, wherein, The low-voltage power supply system further comprises: a battery management system, one end of the battery management system being connected to the first end of the power battery, for monitoring the operating state of the power battery.

8. The low voltage power supply system of claim 6, wherein, The low-voltage power supply system further comprises: a first safety circuit, one end of the first safety circuit being connected to the second end of the first vehicle-mounted DC sub-circuit, and the other end of the first safety circuit being connected to the first load.

9. The low voltage power supply system of claim 6, wherein, The low-voltage power supply system further comprises: a second safety circuit, one end of the second safety circuit being connected to the second end of the second vehicle-mounted DC sub-circuit, and the other end of the second safety circuit being connected to the second load.

10. A vehicle characterized by comprising: The low-voltage power supply system comprises: the low-voltage power supply system according to any one of claims 1-9.

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