Power supply system and vehicle

Abstract

The utility model provides a power supply system and a vehicle, and the power supply system comprises a power battery which is used for outputting power supply voltage; when the vehicle is in a lower high-voltage state, the vehicle does not need to be awakened, the static power consumption of the vehicle and the power utilization requirement of a high-power scene are met, the energy utilization rate is increased, the feed probability is reduced, the vehicle is started when the vehicle is in a failure state, and the power supply efficiency is improved. And when the vehicle is in a high-voltage state, the vehicle is supported to run safely under the condition of limited power, the vehicle is prevented from lying down directly, the high-power electricity utilization requirement of the vehicle is met, and the functional safety level of the power supply system is improved.

Description

TECHNICAL FIELD

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

[0002] In the existing low-voltage distribution topology, when the vehicle-mounted DCDC (Direct Current, direct current to direct current power supply) circuit fails, the starting battery can only support the safe parking function of the vehicle, and cannot support the safe driving of the vehicle under the limited power condition, resulting in that the vehicle can only be parked on the roadside to wait for rescue, and when the starting battery fails or the low power protection, the vehicle cannot be started normally, resulting in that the vehicle directly crashes; at the same time, under the OFF state, the starting battery needs to meet the static power consumption of the vehicle, which is easy to cause the starting battery to feed; and the vehicle needs to wake up the vehicle before starting the vehicle-mounted DCDC circuit during intelligent charging, resulting in that the energy utilization rate is reduced. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art.

[0004] Therefore, one purpose of the utility model is to provide a power supply system, which does not need to wake up the vehicle when the vehicle is in a high-voltage state, meets the static power consumption and high-power scene power demand of the vehicle, improves the energy utilization rate, reduces the probability of feeding, starts the vehicle when the vehicle is in a failure state, avoids the vehicle directly crashing, supports the safe driving of the vehicle under the limited power condition when the vehicle is in a high-voltage state, avoids the vehicle directly crashing, meets the high-power power demand of the vehicle, and improves the functional safety level of the power supply system.

[0005] Therefore, the second purpose of the utility model is to provide a vehicle.

[0006] In order to achieve the above purpose, the embodiment of the first aspect of the utility model provides a power supply system, which comprises: a power battery for outputting a power supply voltage; a backup DCDC circuit, the backup DCDC circuit is arranged inside the power battery, the first end of the backup DCDC circuit is connected with the positive electrode of the power battery, the second end of the backup DCDC circuit is connected with the negative electrode of the power battery, and the third end of the backup DCDC circuit is connected with a load for outputting a supply power voltage.

[0007] According to the power supply system of the embodiment of the utility model, by increasing the spare DCDC circuit integrated in the power battery, when the vehicle is in the high-voltage state, the vehicle does not need to be woken up, the spare DCDC circuit outputs the supply power voltage according to the power supply voltage, meets the static power consumption and high-power scene power demand of the vehicle, improves the energy utilization rate, and reduces the power feeding probability; when the vehicle is in the failure state, the supply power voltage output by the spare DCDC can start the vehicle, avoiding the vehicle directly lying in the nest; when the vehicle is in the high-voltage state, the spare DCDC circuit supports the vehicle to safely drive under the limited power condition, avoids the vehicle directly lying in the nest, meets the high-power power demand of the vehicle, and improves the functional safety level of the power supply system.

[0008] In some embodiments, a vehicle-mounted DCDC circuit, a first end of the vehicle-mounted DCDC circuit is connected to the positive electrode, a second end of the vehicle-mounted DCDC circuit is connected to the load, and a third end of the vehicle-mounted DCDC circuit is connected to the negative electrode for outputting a supply power voltage; a starting battery, a positive electrode of the starting battery is connected to the second end of the vehicle-mounted DCDC circuit, and a negative electrode of the starting battery is grounded for outputting a starting voltage.

[0009] In some embodiments, the spare DCDC circuit comprises: a first DCDC circuit, a first end of the first DCDC circuit is connected to the positive electrode, a second end of the first DCDC circuit is connected to the negative electrode, and a third end of the first DCDC circuit is connected to the load for outputting a first supply power voltage when the starting voltage is less than a first preset voltage; and a second DCDC circuit, a first end of the second DCDC circuit is connected to the positive electrode, a second end of the second DCDC circuit is connected to the negative electrode, and a third end of the second DCDC circuit is connected to the load for outputting a second supply power voltage when the supply power voltage is less than a second preset voltage.

[0010] In some embodiments, the first DCDC circuit comprises: a first primary side circuit, one end of the first primary side circuit is connected to the negative electrode; a first secondary side circuit, a first end of the first secondary side circuit is grounded; a first transformer, a first end of a primary winding of the first transformer is connected to the positive electrode, a second end of the primary winding is connected to the other end of the first primary side circuit, a first end of a secondary winding of the first transformer is connected to a second end of the first secondary side circuit, and a second end of the secondary winding is connected to a third end of the first secondary side circuit.

[0011] In some embodiments, the first secondary side circuit comprises: a first diode, one end of the first diode is connected to the first end of the secondary winding; and a first capacitor, one end of the first capacitor is connected to the other end of the first diode, and the other end of the first capacitor is connected to the second end of the secondary winding and grounded.

[0012] In some embodiments, the second DCDC circuit comprises: a second primary circuit, a first end of the second primary circuit is connected to the positive electrode, and a second end of the second primary circuit is connected to the negative electrode; a second secondary circuit, a first end of the second secondary circuit is grounded; a second transformer, a first end of a primary winding of the second transformer is connected to a third end and a fourth end of the second primary circuit, a second end of the primary winding is connected to a fifth end and a sixth end of the second primary circuit, a first end of a secondary winding of the second transformer is connected to a second end of the second secondary circuit, and a second end of the secondary winding is connected to a third end of the second secondary circuit.

[0013] In some embodiments, the second primary circuit comprises: a second switch tube, a drain of the second switch tube is connected to the positive electrode, and a source of the second switch tube is connected to the first end of the primary winding; a second diode, one end of the second diode is connected to the positive electrode, and the other end of the second diode is connected to the second end of the primary winding; a third switch tube, a drain of the third switch tube is connected to the second end of the primary winding, and a source of the third switch tube is connected to the negative electrode; and a third diode, one end of the third diode is connected to the first end of the primary winding, and the other end of the third diode is connected to the negative electrode.

[0014] In some embodiments, the second secondary circuit comprises: a fourth diode, one end of the fourth diode is connected to the first end of the secondary winding; a fifth diode, one end of the fifth diode is connected to the other end of the fourth diode, and the other end of the fifth diode is connected to the second end of the secondary winding and grounded; a first inductor, one end of the first inductor is connected to the other end of the fourth diode; and a second capacitor, one end of the second capacitor is connected to the other end of the first inductor, and the other end of the second capacitor is grounded.

[0015] In some embodiments, the vehicle-mounted DCDC circuit comprises: a third capacitor, one end of the third capacitor is connected to the positive electrode, and the other end of the third capacitor is connected to the negative electrode; a fourth switch tube, the drain electrode of the fourth switch tube is connected to one end of the third capacitor; a fifth switch tube, the drain electrode of the fifth switch tube is connected to the source electrode of the fourth switch tube, and the source electrode of the fifth switch tube is connected to the other end of the third capacitor; a sixth switch tube, the drain electrode of the sixth switch tube is connected to one end of the third capacitor; a seventh switch tube, the drain electrode of the seventh switch tube is connected to the source electrode of the sixth switch tube, and the source electrode of the seventh switch tube is connected to the other end of the third capacitor; a third transformer, the first end of the primary winding of the third transformer is connected to the source electrode of the fourth switch tube and the source electrode of the sixth switch tube, the midpoint of the primary winding of the third transformer is grounded, and the second end of the primary winding of the third transformer is connected to the drain electrode of the fifth switch tube and the drain electrode of the seventh switch tube; a sixth diode, one end of the sixth diode is connected to the first end of the secondary winding of the third transformer; a seventh diode, one end of the seventh diode is connected to the second end of the secondary winding of the third transformer; and a fourth capacitor, one end of the fourth capacitor is connected to the other end of the sixth diode and the seventh diode and the positive electrode of the starting battery, and the other end of the fourth capacitor is grounded.

[0016] To achieve the above object, the second aspect of the embodiment of the utility model provides a kind of vehicle, and the vehicle includes the power supply system described in the above embodiment.

[0017] According to the vehicle of the utility model embodiment, by increasing the spare DCDC circuit integrated in the power battery, when the vehicle is in the high-voltage state, the vehicle does not need to be awakened, the spare DCDC circuit outputs the supply power voltage according to the power supply voltage, meets the static power consumption and high-power scene power demand of the vehicle, improves the energy utilization rate, reduces the probability of power supply, when the vehicle is in the failure state, the supply power voltage output by the spare DCDC can start the vehicle, to avoid the vehicle directly lying in the nest, when the vehicle is in the high-voltage state, the spare DCDC circuit supports the vehicle to drive safely under the condition of limited power, avoids the vehicle directly lying in the nest, and meets the high-power power demand of the vehicle, improves the functional safety level of the power supply system.

[0018] 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 known by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0020] Figure 1 It is a low-voltage power distribution topology of prior art;

[0021] Figure 2 is a low-voltage power distribution circuit diagram of the prior art;

[0022] Figure 3 is a low-voltage power distribution topology diagram according to one embodiment of the present application;

[0023] Figure 4 is a low-voltage power distribution topology diagram according to another embodiment of the present application;

[0024] Figure 5 is a low-voltage power distribution circuit diagram according to one embodiment of the present application;

[0025] Figure 6 is a structure block diagram of a vehicle according to one embodiment of the present application.

[0026] Reference signs:

[0027] Power supply system 100;

[0028] Power battery 10;

[0029] Backup DCDC circuit 11; on-board DCDC circuit 12; starting battery 13; battery power distribution circuit 14; low-voltage power distribution box 15;

[0030] First DCDC circuit 1; second DCDC circuit 2;

[0031] First switch tube Q1; second switch tube Q2; third switch tube Q3; fourth switch tube Q4; fifth switch tube Q5; sixth switch tube Q6; seventh switch tube Q7;

[0032] First transformer T1; second transformer T2; third transformer T3;

[0033] First diode D1; second diode D2; third diode D3; fourth diode D4; fifth diode D5; sixth diode D6; seventh diode D7;

[0034] First capacitor C1; second capacitor C2; third capacitor C3; fourth capacitor C4;

[0035] First switch K1; second switch K2; third switch K3;

[0036] Resistor R;

[0037] Vehicle 110. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary, and the embodiments of the present application are described in detail below.

[0039] With increasing emphasis on environmental protection and low carbon emissions, the development of new energy vehicles has accelerated significantly. Vehicles are rapidly integrating with technologies in energy, transportation, and information communication, making electrification, connectivity, and intelligence the prevailing trends in the vehicle industry. New technologies for new energy vehicles are emerging rapidly. For example, patent applications CN202410658157.7 (publication number CN118238797B) entitled "Intelligent Energy Management System, Control Method, and Related Equipment for New Energy Vehicles"; CN202410672579.X (publication number CN118597091A) entitled "Intelligent Energy Management Method, System, and Related Equipment for New Energy Vehicles"; and CN202010470247.5 (publication number CN113734146B) entitled "Vehicle Driving Mode Selection Method, Device, Equipment, and Medium," all describe hybrid technology primarily based on electricity, offering multiple advantages such as speed, fuel efficiency, quietness, smoothness, and environmental friendliness.

[0040] Furthermore, the following inventions are proposed: Application No. CN202211678720.4, Publication No. CN117382629B, entitled "Power Control Method, Device, Medium, Vehicle Controller, and Vehicle"; Application No. CN202311164098.X, Publication No. CN116890770B, entitled "Vehicle Control System, Method, and Vehicle"; and Application No. CN202311170393.6, Publication No. CN117533292B, entitled "Vehicle Control System, Control Method, Controller, and Vehicle". All of these inventions describe a new energy power system with four wheel-side motors independently driven as its core, which greatly improves the safety and power performance of new energy vehicles.

[0041] like Figure 1 and Figure 2 As shown, the vehicle's low-voltage power distribution system currently has two low-voltage power supplies: one is the onboard DC-DC circuit, and the other is the starting battery. These two power supplies serve as backups for each other. The starting battery primarily meets the static power consumption and startup power consumption when the vehicle is OFF. The onboard DC-DC circuit primarily meets the power needs of low-voltage equipment when the vehicle is ON / OK. In the event of a failure in the onboard DC-DC circuit, the starting battery can provide up to 2 minutes of driving range under single-power-supply conditions, giving the driver sufficient time to safely pull over. However, in the OFF state, the HVSU (High Voltage Safety Unit) cannot function, failing to detect abnormal battery conditions and take appropriate intervention measures in a timely manner, posing a certain risk.

[0042] The following is combined Figures 3-5 The power supply system 100 of this utility model embodiment will be described by way of example.

[0043] As Figure 3 shown, the power supply system 100 of the embodiment of the utility model includes: power battery 10 and spare DCDC circuit 11, wherein,

[0044] Power battery 10 is used to output power supply voltage;Spare DCDC circuit 11 is arranged inside power battery 10, the first end of spare DCDC circuit 11 is connected with the positive pole of power battery 10, the second end of spare DCDC circuit 11 is connected with the negative pole of power battery 10, the third end of spare DCDC circuit 11 is connected with load, and is used to output supply power voltage.For example, the load is 12V normal power load, and one end of the 12V normal power load is grounded through body bonding.

[0045] In the embodiment, spare DCDC circuit 11 is integrated in power battery 10, the high-voltage end of spare DCDC circuit 11 directly takes power from the positive and negative poles of power battery, even if the vehicle is in the high-voltage state, i.e. OFF gear, without waking up the vehicle voltage normal work, spare DCDC circuit 11 can also stably output supply power voltage for the vehicle, the output supply power voltage can meet the static power consumption of the vehicle, can also meet the power consumption demand of special functions such as sentinel mode in high-power scene, improve the energy utilization rate of power battery 10, and reduce the probability of power feeding;When the vehicle is in the failure state, spare DCDC circuit 11 as a backup power supply, the output supply power voltage can start the vehicle, avoiding the vehicle directly lying in the nest, and improving the functional safety level;When the vehicle is in the high-voltage state, i.e. OK gear, spare DCDC circuit 11 as a backup power supply, supports the vehicle to drive safely under the condition of limited power, avoids the vehicle directly lying in the nest, improves the functional safety level, or spare DCDC circuit 11 as a supplementary power supply, meets the high-power power consumption demand of the vehicle.

[0046] According to the power supply system 100 of the embodiment of the utility model, by increasing spare DCDC circuit 11 integrated in power battery 10, when the vehicle is in the high-voltage state, without waking up the vehicle, spare DCDC circuit 11 outputs supply power voltage according to power supply voltage, meets the static power consumption and high-power scene power consumption demand of the vehicle, improves the energy utilization rate, and reduces the probability of power feeding;When the vehicle is in the failure state, spare DCDC circuit 11 as a backup power supply, the output supply power voltage can start the vehicle, avoiding the vehicle directly lying in the nest;When the vehicle is in the high-voltage state, spare DCDC circuit 11 as a backup power supply and a supplementary power supply, supports the vehicle to drive safely under the condition of limited power, avoids the vehicle directly lying in the nest, and meets the high-power power consumption demand of the vehicle, improves the functional safety level of power supply system 100.

[0047] In some embodiments, as Figure 3As shown, the power supply system 100 further comprises: an on-board DCDC circuit 12 and a starting battery 13, wherein,

[0048] The first end of the on-board DCDC circuit 12 is connected to the positive pole, the second end of the on-board DCDC circuit 12 is connected to the load, and the third end of the on-board DCDC circuit 12 is connected to the negative pole for outputting a power supply voltage; the positive pole of the starting battery 13 is connected to the second end of the on-board DCDC circuit 12, and the negative pole of the starting battery 13 is grounded for outputting a starting voltage. The power supply system 100 has three power supplies, one of which is the on-board DCDC circuit 12, one of which is the starting battery 13, and one of which is the backup DCDC circuit 11. The three power supplies back up each other. When the vehicle is in a high-voltage state and the high-voltage state is converted to an OK state, i.e., the OFF gear is converted to the OK gear, if the starting battery 13 fails, the backup DCDC circuit 11 can start the vehicle as a backup power supply, avoiding the vehicle directly lying in the nest, and improving the functional safety level.

[0049] As shown in Figure 4 According to the actual space margin of the power battery 10, it can be selected whether to integrate the starting battery 13 into the power battery 10 to improve the space utilization.

[0050] In some embodiments, as shown in Figure 5 The backup DCDC circuit 11 comprises: a first DCDC circuit 1 and a second DCDC circuit 2, wherein,

[0051] The first end of the first DCDC circuit 1 is connected to the positive pole, the second end of the first DCDC circuit 1 is connected to the negative pole, and the third end of the first DCDC circuit 1 is connected to the load for outputting a first supplementary power supply voltage when the starting voltage is less than a first preset voltage; the first end of the second DCDC circuit 2 is connected to the positive pole, the second end of the second DCDC circuit 2 is connected to the negative pole, and the third end of the second DCDC circuit 2 is connected to the load for outputting a second supplementary power supply voltage when the power supply voltage is less than a second preset voltage.

[0052] In an embodiment, the backup DCDC circuit 11 is composed of the first DCDC circuit 1 and the second DCDC circuit 2, and the powers of the two DCDC circuits are different. The first DCDC circuit 1 is applied to a small-power scenario, and the second DCDC circuit 2 is applied to a large-power scenario.

[0053] When the vehicle is in an OFF state, if it is detected that the starting voltage is less than the first preset voltage, it is considered that the power of the starting battery 13 is low, and then the first DCDC circuit 1 replaces the starting battery 13 to output the first supplementary power supply voltage, so as to meet the static power consumption of the vehicle in the small-power scenario, prolong the endurance time of the starting battery 13, and reduce the probability of power supply. The power supply voltage of the power battery 10 is converted by the first DCDC circuit 1 and directly supplied to the low-voltage equipment of the vehicle, without passing through the starting battery 13, and the energy conversion efficiency is relatively high.

[0054] When the vehicle is in OFF state, the first DCDC circuit 1 can wake up the BMC (Battery Management Controller) and HVSU in time, monitor the state of the power battery 10, discover abnormalities in time and take corresponding intervention measures, reduce the risk of out of control, because the HVSU in the existing topology needs to wake up the high voltage on the vehicle before it can work normally, the energy consumption is high, the first DCDC circuit 1 directly supplies power to the HVSU by increasing the standby DCDC circuit 11, without waking up the vehicle, insulation voltage monitoring can be carried out, in addition, the first DCDC circuit 1 supplies power to the control circuit of the second DCDC circuit 2.

[0055] When the vehicle is in OFF state, if it is detected that the vehicle needs to meet the power demand of sentinel mode and other special functions in high-power scenarios, because the power consumption of these special functions is relatively large, reaching the ampere level, the power of the first DCDC circuit 1 is insufficient to meet the power demand, the second DCDC circuit 2 is awakened by the control circuit of the second DCDC circuit 2 to meet the power demand of the vehicle in high-power scenarios; when the vehicle is in the state of turning from low voltage to high voltage, i.e. from OFF gear to OK gear, if the starting battery 13 fails, the first DCDC circuit 1 and the second DCDC circuit 2 can start the vehicle as a backup power supply, avoiding the vehicle directly lying in the nest, and improving the functional safety level.

[0056] When the vehicle is in OK state, if it is detected that the supply voltage is less than the second preset voltage, it is considered that the vehicle-mounted DCDC circuit 12 is abnormal, then the second DCDC circuit 2 replaces the vehicle-mounted DCDC circuit 12 to output the second supply voltage to meet the safe driving of the vehicle. Because the capacity of the starting battery 13 is limited when the vehicle-mounted DCDC circuit 12 is abnormal in the existing topology, it can only meet the low-voltage power demand of the vehicle for 2 minutes, by increasing the second DCDC circuit 2 of the standby DCDC circuit 11, the capacity of the starting battery 13 can be reduced, and in the case of limited power, the safe driving demand can be met without stopping and waiting for rescue.

[0057] When the vehicle is in low-voltage overload, the second DCDC circuit 2 can also assist the vehicle-mounted DCDC circuit 12 and the starting battery 13 to discharge as a supplementary power supply. At present, during driving, the steady state and small dynamic load do not exceed 50% of the total load, and with the increasing demand for low-voltage power of the vehicle, the power idling will become more and more serious. Due to the limitation of heat dissipation capacity and space, the power in the industry is mainly 3KW and below. In order to meet the increasing demand for power of the vehicle, the second DCDC circuit 2 can increase the redundancy design while meeting the power demand, and improve the system reliability.

[0058] When the starting battery 13 is abnormal, the second DCDC circuit 2 replaces it to complete the vehicle starting process. In the existing topology, the starting battery 13 is used to meet the starting power consumption. If the starting battery 13 is abnormal, the vehicle cannot start. By adding the second DCDC circuit 2 of the standby DCDC circuit 11, the starting process can be completed by the second DCDC circuit 2 instead of the starting battery 13, avoiding the vehicle directly lying in the nest.

[0059] The topology of the first DCDC circuit 1 and the second DCDC circuit 2 can be adjusted according to specific power requirements. Figure 4 This is only one application scheme for reference.

[0060] In some embodiments, as shown in Figure 5 The first DCDC circuit 1 includes a first primary side circuit, a first secondary side circuit, and a first transformer, for example, T1, wherein

[0061] One end of the first primary side circuit is connected to the negative electrode; the first end of the first secondary side circuit is grounded; the first end of the primary winding of the first transformer T1 is connected to the positive electrode, the second end of the primary winding is connected to the other end of the first primary side circuit, the first end of the secondary winding of the first transformer T1 is connected to the second end of the first secondary side circuit, and the second end of the secondary winding is connected to the third end of the first secondary side circuit. The first primary side circuit includes a first switch tube Q1, the source of the first switch tube Q1 is connected to the negative electrode, and the drain of the first switch tube Q1 is connected to the second end of the primary winding.

[0062] In some embodiments, as shown in Figure 5 The first secondary side circuit includes a first diode, for example, D1, and a first capacitor, for example, C1, wherein one end of the first diode D1 is connected to the first end of the secondary winding; one end of the first capacitor C1 is connected to the other end of the first diode D1, and the other end of the first capacitor C1 is connected to the second end of the secondary winding and the ground.

[0063] In some embodiments, as shown in Figure 5 The second DCDC circuit 2 includes a second primary side circuit, a second secondary side circuit, and a second transformer, for example, T2, wherein

[0064] The first end of the second primary side circuit is connected to the positive electrode, and the second end of the second primary side circuit is connected to the negative electrode; the first end of the second secondary side circuit is grounded; the first end of the primary winding of the second transformer T2 is connected to the third end and the fourth end of the second primary side circuit, the second end of the primary winding is connected to the fifth end and the sixth end of the second primary side circuit, the first end of the secondary winding of the second transformer T2 is connected to the second end of the second secondary side circuit, and the second end of the secondary winding is connected to the third end of the second secondary side circuit.

[0065] In some embodiments, as shown in Figure 5As shown, the second primary-side circuit includes: a second switching transistor, for example denoted as Q2; a second diode, for example denoted as D2; a third switching transistor, for example denoted as Q3; and a third diode, for example denoted as D3, wherein...

[0066] The drain of the second switch Q2 is connected to the positive terminal, and the source of the second switch Q2 is connected to the first terminal of the primary winding; one end of the second diode D2 is connected to the positive terminal, and the other end of the second diode D2 is connected to the second terminal of the primary winding; the drain of the third switch Q3 is connected to the second terminal of the primary winding, and the source of the third switch Q3 is connected to the negative terminal; one end of the third diode D3 is connected to the first terminal of the primary winding, and the other end of the third diode D3 is the negative terminal.

[0067] In some embodiments, such as Figure 5 As shown, the second secondary circuit includes: a fourth diode, for example denoted as D4; a fifth diode, for example denoted as D5; a first inductor, for example denoted as L1; and a second capacitor, for example denoted as C2.

[0068] One end of the fourth diode D4 is connected to the first end of the secondary winding; one end of the fifth diode D5 is connected to the other end of the fourth diode D4, and the other end of the fifth diode D5 is connected to the second end of the secondary winding and ground; one end of the first inductor is connected to the other end of the fourth diode D4; one end of the second capacitor C2 is connected to the other end of the first inductor, and the other end of the second capacitor C2 is grounded.

[0069] In some embodiments, such as Figure 5 As shown, the vehicle-mounted DC-DC circuit 12 includes: a third capacitor, for example denoted as C3; a fourth switch, for example denoted as Q4; a fifth switch, for example denoted as Q5; a sixth switch, for example denoted as Q6; a seventh switch, for example denoted as Q7; a third transformer, for example denoted as T3; a sixth diode, for example denoted as D6; a seventh diode, for example denoted as D7; and a fourth capacitor, for example denoted as C4.

[0070] One end of the third capacitor C3 is connected to the positive electrode, and the other end of the third capacitor C3 is connected to the negative electrode; the drain of the fourth switch tube Q4 is connected to one end of the third capacitor C3; the drain of the fifth switch tube Q5 is connected to the source of the fourth switch tube Q4, and the source of the fifth switch tube Q5 is connected to the other end of the third capacitor C3; the drain of the sixth switch tube Q6 is connected to one end of the third capacitor C3; the drain of the seventh switch tube Q7 is connected to the source of the sixth switch tube Q6, and the source of the seventh switch tube Q7 is connected to the other end of the third capacitor C3; the first end of the primary winding of the third transformer T3 is connected to the source of the fourth switch tube Q4 and the source of the sixth switch tube Q6, the midpoint of the primary winding of the third transformer T3 is grounded, and the second end of the primary winding of the third transformer T3 is connected to the drain of the fifth switch tube Q5 and the drain of the seventh switch tube Q7; one end of the sixth diode D6 is connected to the first end of the secondary winding of the third transformer T3; one end of the seventh diode D7 is connected to the second end of the secondary winding of the third transformer T3; one end of the fourth capacitor C4 is connected to the other end of the sixth diode D6 and the seventh diode D7 and the positive electrode of the starting battery 13, and the other end of the fourth capacitor C4 is grounded.

[0071] In some embodiments, as shown in FIG. 1, the power supply system 100 further comprises a battery power distribution circuit 14, for example, denoted as BDU (Battery Drive Unit), which is arranged inside the power battery 10. The first end of the battery power distribution circuit 14 is connected to the positive electrode, the second end of the battery power distribution circuit 14 is connected to the first end of the on-board DCDC circuit 12, the third end of the battery power distribution circuit 14 is connected to the second end of the on-board DCDC circuit 12, and the fourth end of the battery power distribution circuit 14 is grounded. Figure 3 Figure 4 In some embodiments, as shown in FIG. 1, the battery power distribution circuit 14 comprises a first switch, for example, denoted as K1, a protection unit, for example, denoted as FUSE, a third switch, for example, denoted as K3, a resistor, for example, denoted as R, a first switch, for example, denoted as K1, and a high-voltage monitoring unit. The first switch K1 and the first switch K1 are the main contactors of the battery power distribution circuit 14.

[0072] One end of the first switch K1 is connected to the positive electrode; one end of the protection unit is connected to the other end of the first switch K1, and the other end of the protection unit is connected to the first end of the on-board DCDC circuit 12; one end of the third switch K3 is connected to one end of the first switch K1; one end of the resistor R is connected to the other end of the third switch K3, and the other end of the resistor R is connected to the other end of the first switch K1; one end of the second switch K2 is connected to the negative electrode; one end of the high-voltage monitoring unit is connected to the other end of the second switch K2, and the other end of the high-voltage monitoring unit is connected to the second end of the on-board DCDC circuit 12. Figure 5

[0073]

[0074] ​​​In some embodiments, such as Figures 3-5 As shown, the power system 100 also includes: a low-voltage distribution box 15, the first end of the low-voltage distribution box 15 is connected to one end of the fourth capacitor C4, the second end of the low-voltage distribution box 15 is connected to the load, and the third end of the low-voltage distribution box 15 is connected to the positive terminal of the starting battery 13.

[0075] According to the power system 100 of this utility model embodiment, by adding a backup DC-DC circuit 11 integrated inside the power battery 10, when the vehicle is in a low-voltage state, there is no need to wake up the vehicle. The backup DC-DC circuit 11 outputs a supplementary power supply voltage according to the power supply voltage, which meets the static power consumption and power demand of the vehicle in high-power scenarios, improves energy utilization, and reduces the probability of power failure. When the vehicle is in a failure state, the backup DC-DC circuit 11 serves as a backup power source, and the output supplementary power supply voltage can start the vehicle, preventing the vehicle from breaking down directly. When the vehicle is in a high-voltage state, the backup DC-DC circuit 11 serves as a backup power source and a supplementary power source, supporting the vehicle to drive safely under power-limited conditions, preventing the vehicle from breaking down directly, and meeting the high-power power demand of the vehicle, thereby improving the functional safety level of the power system 100.

[0076] The following is combined with Figure 6 Vehicle 110, an embodiment of the present utility model, is described.

[0077] like Figure 6 As shown, the vehicle 110 of this utility model embodiment includes the power system 100 of the above embodiment.

[0078] According to the embodiment of this utility model, the vehicle 110 integrates a backup DC-DC circuit 11 inside the power battery 10. When the vehicle is in a low-voltage state, there is no need to wake up the vehicle. The backup DC-DC circuit 11 outputs a supplementary power supply voltage according to the power supply voltage, which meets the static power consumption and power demand of the vehicle in high-power scenarios, improves energy utilization, and reduces the probability of power failure. When the vehicle is in a failure state, the backup DC-DC circuit 11 acts as a backup power source, and the output supplementary power supply voltage can start the vehicle, preventing the vehicle from breaking down directly. When the vehicle is in a high-voltage state, the backup DC-DC circuit 11 acts as a backup power source and a supplementary power source, supporting the vehicle to drive safely under power-limited conditions, preventing the vehicle from breaking down directly, and meeting the high-power power demand of the vehicle, thereby improving the functional safety level of the power system 100.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0080] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A power supply system characterized by comprising: The power supply system comprises: a power battery for outputting a power supply voltage; a backup DCDC circuit arranged inside the power battery, a first end of the backup DCDC circuit being connected to a positive electrode of the power battery, a second end of the backup DCDC circuit being connected to a negative electrode of the power battery, and a third end of the backup DCDC circuit being connected to a load for outputting a supplementary power supply voltage.

2. The power supply system according to claim 1, characterized by The power supply system further comprises: a vehicle-mounted DCDC circuit, a first end of the vehicle-mounted DCDC circuit being connected to the positive electrode, a second end of the vehicle-mounted DCDC circuit being connected to the load, and a third end of the vehicle-mounted DCDC circuit being connected to the negative electrode for outputting a power supply voltage; a starting battery, a positive electrode of the starting battery being connected to the second end of the vehicle-mounted DCDC circuit, and a negative electrode of the starting battery being grounded for outputting a starting voltage.

3. The power supply system of claim 2, wherein The backup DCDC circuit comprises: a first DCDC circuit, a first end of the first DCDC circuit being connected to the positive electrode, a second end of the first DCDC circuit being connected to the negative electrode, and a third end of the first DCDC circuit being connected to the load for outputting a first supplementary power supply voltage when the starting voltage is less than a first preset voltage; a second DCDC circuit, a first end of the second DCDC circuit being connected to the positive electrode, a second end of the second DCDC circuit being connected to the negative electrode, and a third end of the second DCDC circuit being connected to the load for outputting a second supplementary power supply voltage when the power supply voltage is less than a second preset voltage.

4. The power supply system according to claim 3, characterized by The first DCDC circuit comprises: a first primary circuit, one end of the first primary circuit being connected to the negative electrode; a first secondary circuit, a first end of the first secondary circuit being grounded; a first transformer, a first end of a primary winding of the first transformer being connected to the positive electrode, a second end of the primary winding being connected to the other end of the first primary circuit, a first end of a secondary winding of the first transformer being connected to a second end of the first secondary circuit, and a second end of the secondary winding being connected to a third end of the first secondary circuit.

5. The power supply system of claim 4, wherein The first secondary circuit comprises: a first diode, one end of the first diode being connected to the first end of the secondary winding; a first capacitor, one end of the first capacitor being connected to the other end of the first diode, and the other end of the first capacitor being connected to the second end of the secondary winding and being grounded.

6. The power supply system of claim 3, wherein The second DCDC circuit comprises: a second primary circuit, a first end of the second primary circuit being connected to the positive electrode, and a second end of the second primary circuit being connected to the negative electrode; a second secondary circuit, a first end of the second secondary circuit being grounded; a second transformer, a first end of a primary winding of the second transformer being connected to a third end and a fourth end of the second primary circuit, a second end of the primary winding being connected to a fifth end and a sixth end of the second primary circuit, a first end of a secondary winding of the second transformer being connected to a second end of the second secondary circuit, and a second end of the secondary winding being connected to a third end of the second secondary circuit.

7. The power supply system of claim 6, wherein The second primary circuit comprises: a second switch tube, a drain of the second switch tube is connected to the positive pole, a source of the second switch tube is connected to a first end of the primary winding; a second diode, one end of the second diode is connected to the positive pole, the other end of the second diode is connected to a second end of the primary winding; a third switch tube, a drain of the third switch tube is connected to the second end of the primary winding, a source of the third switch tube is connected to the negative pole; a third diode, one end of the third diode is connected to the first end of the primary winding, the other end of the third diode is connected to the negative pole.

8. The power supply system of claim 6, wherein the second auxiliary side circuit comprises: a fourth diode, one end of the fourth diode is connected to a first end of the secondary winding; a fifth diode, one end of the fifth diode is connected to the other end of the fourth diode, the other end of the fifth diode is connected to a second end of the secondary winding and the ground; a first inductor, one end of the first inductor is connected to the other end of the fourth diode; a second capacitor, one end of the second capacitor is connected to the other end of the first inductor, the other end of the second capacitor is connected to the ground.

9. The power supply system of claim 2, wherein, the vehicle-mounted DCDC circuit comprises: a third capacitor, one end of the third capacitor is connected to the positive pole, the other end of the third capacitor is connected to the negative pole; a fourth switch tube, a drain of the fourth switch tube is connected to one end of the third capacitor; a fifth switch tube, a drain of the fifth switch tube is connected to a source of the fourth switch tube, a source of the fifth switch tube is connected to the other end of the third capacitor; a sixth switch tube, a drain of the sixth switch tube is connected to one end of the third capacitor; a seventh switch tube, a drain of the seventh switch tube is connected to a source of the sixth switch tube, a source of the seventh switch tube is connected to the other end of the third capacitor; a third transformer, a first end of a primary winding of the third transformer is connected to the source of the fourth switch tube and the source of the sixth switch tube, a midpoint of the primary winding of the third transformer is connected to the ground, a second end of the primary winding of the third transformer is connected to the drain of the fifth switch tube and the drain of the seventh switch tube; a sixth diode, one end of the sixth diode is connected to a first end of a secondary winding of the third transformer; a seventh diode, one end of the seventh diode is connected to a second end of the secondary winding of the third transformer; a fourth capacitor, one end of the fourth capacitor is connected to the other end of the sixth diode and the seventh diode and the positive pole of the starting battery, the other end of the fourth capacitor is connected to the ground.

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

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