High-voltage power supply battery, power supply method, 48V light hybrid system and vehicle

Abstract

The invention discloses a high-voltage power supply battery, a power supply method, a 48V light hybrid system and a vehicle. A first DCDC conversion circuit and a second DCDC conversion circuit are integrally arranged in a high-voltage battery cell battery pack for voltage conversion, 12V voltage is output to low-power equipment, 48V voltage is output to high-power equipment, and two paths of power supply do not influence each other and work independently. When the high-voltage power supply battery cannot supply power normally, the battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the 12V external power supply voltage into the voltage capable of charging the high-voltage battery cell, and the high-voltage battery cell is charged. When the vehicle brakes in the driving process, the 48V starting and power generating all-in-one machine converts 48V voltage into voltage capable of charging a high-voltage battery cell through the second DCDC conversion circuit of the high-voltage power supply battery, and the high-voltage battery cell is charged. An independent 48V battery is prevented from being arranged to supply power to a low-power system, so that the utilization rate of layout space in a cabin is high, and the vehicle cost is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-voltage power supply for electric vehicles, and in particular relates to a high-voltage power supply battery, a power supply method, a 48V mild hybrid system and a vehicle. Background Art

[0002] At present, in the 48V mild hybrid system, high-power devices such as air-conditioning compressors and starter motors use 48V voltage, and low-power devices in the intelligent driving domain, chassis domain, entertainment domain, and body domain use 12V voltage. In order to meet the needs of users, the prior art generally adopts the method of adding a separate DCDC controller and a 48V lithium battery to achieve 48V / 12V conversion to power low-power devices. For example, the Chinese invention patent with application publication number: CN108216086 A discloses a DCDC converter of a 48V mild hybrid system and a control method thereof, wherein the control method includes: step S1, before the battery management system relay is closed, controlling the DCDC converter to execute a reverse pre-charge mode to transfer the power of the 12V battery to the 48V electrical network; step S2, if the battery management system relay is in a closed state and meets the forward transmission condition, then controlling the DCDC converter to execute a forward transmission mode to transfer the power of the 48V battery to the 12V electrical network. Since it is necessary to add an independent DCDC controller and 48V lithium battery to complete the power supply of low-power devices in the vehicle, so that some low-power electronic devices in the vehicle can continue to use 12V voltage. However, due to the increasingly compact layout of the interior and cabin in recent years, and the development of new models towards domain control and integration, the use of a separate DCDC controller and 48V lithium battery requires the addition of additional battery wiring harnesses, resulting in reduced utilization of the cabin layout space and increased vehicle costs.

[0003] A new high-voltage power supply battery is needed to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to provide a high-voltage power supply battery to solve the technical problem that in the prior art, power supply for low-power equipment requires additional DCDC controller and 48V lithium battery, which reduces the utilization rate of the layout space in the cabin and increases the cost of the vehicle.

[0005] The present invention also aims to provide a 48V mild hybrid system using a high-voltage power supply battery.

[0006] Another object of the present invention is to provide a high voltage power supply method using a high voltage power supply battery.

[0007] Another object of the present invention is to provide a vehicle.

[0008] The technical solution of the present invention to solve the technical problem is: A high-voltage power supply battery comprises: a high-voltage battery cell, a first DCDC conversion circuit, and a second DCDC conversion circuit; the first DCDC conversion circuit and the second DCDC conversion circuit are both integrated in a battery pack of the high-voltage battery cell, the high-voltage battery cell is connected to the first DCDC conversion circuit, the first DCDC conversion circuit has a first power output port, the voltage of the high-voltage battery cell is converted into a 12V voltage by the first DCDC conversion circuit, and is used to power low-power equipment after voltage distribution by a vehicle body controller; the high-voltage battery cell is connected to the second DCDC conversion circuit, the second DCDC conversion circuit has a second power output port, the voltage of the high-voltage battery cell is converted into a 48V voltage by the second DCDC conversion circuit, and is used to power high-power equipment.

[0009] Preferably, the first DCDC conversion circuit includes a first full-bridge hard switch tube, a first current doubler rectifier circuit, and a first solid-state aluminum electrolytic capacitor; the high-voltage battery cell is electrically connected to the first full-bridge hard switch tube, the first full-bridge hard switch tube is electrically connected to the first current doubler rectifier circuit, and the first current doubler rectifier circuit is electrically connected to the first solid-state aluminum electrolytic capacitor.

[0010] Preferably, the second DCDC conversion circuit includes a second full-bridge hard switch tube, a second current doubler rectifier circuit, and a second solid-state aluminum electrolytic capacitor. The high-voltage battery cell is electrically connected to the second full-bridge hard switch tube, the second full-bridge hard switch tube is electrically connected to the second current doubler rectifier circuit, and the second current doubler rectifier circuit is electrically connected to the second solid-state aluminum electrolytic capacitor.

[0011] Preferably, the high-voltage battery cell is a 380V high-voltage battery cell or an 800V high-voltage battery cell.

[0012] Preferably, the low-power devices include: intelligent driving domain low-power devices, chassis domain low-power devices, entertainment domain low-power devices, and body domain low-power devices.

[0013] Preferably, the high-power equipment includes: a 48V electronically controlled compressor and a 48V integrated starter generator.

[0014] A 48V mild hybrid system with a high voltage power supply battery, comprising: High-voltage power supply battery, body controller, intelligent driving domain low-power equipment, chassis domain low-power equipment, entertainment domain low-power equipment, body domain low-power equipment, 48V electronically controlled compressor, 48V integrated starter generator; the high-voltage power supply battery has a first power output interface that can output 12V voltage and a second power output interface that can output 48V voltage, the first power output interface is electrically connected to the body controller, and the body controller is respectively connected to the intelligent driving domain low-power equipment, chassis domain low-power equipment, entertainment domain low-power equipment, and body domain low-power equipment; the second power output interface is respectively electrically connected to the 48V electronically controlled compressor and the 48V integrated starter generator.

[0015] A high voltage power supply method using a high voltage power supply battery, comprising: When the high-voltage power supply battery can supply power normally, after the low-power device sends a power request to the battery management system through the body controller, the battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the voltage of the high-voltage battery cell into a 12V voltage and output it to the body controller. After the body controller matches the power supply direction, it outputs the 12V voltage to the low-power device; after the high-power device sends a power request to the battery management system, the battery management system controls the second DCDC conversion circuit of the high-voltage power supply battery to convert the voltage of the high-voltage battery cell into a 48V voltage, and outputs the 48V voltage to the high-power device; When the high-voltage power supply battery cannot supply power normally, a 12V external power supply is used. The battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the 12V external power supply voltage into a voltage that can charge the high-voltage battery cell, thereby charging the high-voltage battery cell.

[0016] Preferably, the high-power equipment includes: a 48V integrated starter generator. When the vehicle brakes during driving, the 48V integrated starter generator converts the 48V voltage into a voltage that can charge the high-voltage battery cell through the second DCDC conversion circuit of the high-voltage power supply battery, thereby charging the high-voltage battery cell.

[0017] A vehicle adopts a high-voltage power supply battery.

[0018] The beneficial effects of the present invention are as follows: by integrating the first DCDC conversion circuit and the second DCDC conversion circuit into the high-voltage battery cell battery pack, the first DCDC conversion circuit and the second DCDC conversion circuit are used for voltage conversion, 12V voltage is output to low-power equipment, and 48V voltage is output to high-power equipment, and the two power supplies do not affect each other and work independently. When the high-voltage power supply battery cannot supply power normally, when using a 12V external power supply, the battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the 12V external power supply voltage into a voltage that can charge the high-voltage battery cell, and charges the high-voltage battery cell. When the vehicle brakes during driving, the 48V starter generator converts the 48V voltage into a voltage that can charge the high-voltage battery cell through the second DCDC conversion circuit of the high-voltage power supply battery, and charges the high-voltage power supply battery cell. Avoiding the setting of a separate 48V battery to power the low-power system, there is no need to add an additional DCDC controller and wiring harness, so that the layout space utilization rate in the cabin is large and the vehicle cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a circuit schematic diagram of the high voltage power supply battery of the present invention; Figure 2 It is a power supply schematic diagram of the high voltage power supply method of the present invention. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Embodiment 1: like Figure 1As shown, the present invention discloses a high-voltage power supply battery, including: a high-voltage battery cell, a first DCDC conversion circuit, and a second DCDC conversion circuit; the first DCDC conversion circuit and the second DCDC conversion circuit are both integrated in the high-voltage battery cell battery pack, the high-voltage battery cell is connected to the first DCDC conversion circuit, and the first DCDC conversion circuit has a first power output port. Among them, the high-voltage battery cell is a 380V high-voltage battery cell or an 800V high-voltage battery cell. The first DCDC conversion circuit includes a first full-bridge hard switch tube, a first current doubler rectifier circuit, and a first solid-state aluminum electrolytic capacitor. The high-voltage battery cell is electrically connected to the first full-bridge hard switch tube, the first full-bridge hard switch tube is electrically connected to the first current doubler rectifier circuit, the first current doubler rectifier circuit is electrically connected to the first solid-state aluminum electrolytic capacitor, and the first solid-state aluminum electrolytic capacitor is connected to the body controller. The voltage of the high-voltage battery cell is converted into a 12V voltage by the first DCDC conversion circuit, which is used to power low-power devices after the voltage is distributed by the body controller. Low-power devices include: low-power devices in the intelligent driving domain, low-power devices in the chassis domain, low-power devices in the entertainment domain, and low-power devices in the body domain.

[0022] The high-voltage battery cell is connected to the second DCDC conversion circuit, the second DCDC conversion circuit has a second power output port, the second DCDC conversion circuit includes a second full-bridge hard switch tube, a second current doubler rectifier circuit, and a second solid-state aluminum electrolytic capacitor. The high-voltage battery cell is electrically connected to the second full-bridge hard switch tube, the second full-bridge hard switch tube is electrically connected to the second current doubler rectifier circuit, and the second current doubler rectifier circuit is electrically connected to the second solid-state aluminum electrolytic capacitor. The voltage of the high-voltage battery cell is converted into a 48V voltage by the second DCDC conversion circuit for powering high-power equipment. The high-power equipment includes: a 48V electronically controlled compressor and a 48V starting generator. Since the second DCDC conversion circuit is integrated in the high-voltage power supply battery, the high-power equipment is directly connected to the high-voltage power supply battery, which mainly has the following two advantages: 1. The load of the engine is reduced, so that the 48V electronically controlled compressor can also work normally when the engine is turned off; 2. The ignition distance of the vehicle is shortened, so that the noise and vibration of the vehicle ignition are smaller.

[0023] By integrating the first DCDC conversion circuit and the second DCDC conversion circuit into the high-voltage battery cell battery pack, the first DCDC conversion circuit and the second DCDC conversion circuit are used for voltage conversion, and 12V voltage is output to low-power equipment and 48V voltage is output to high-power equipment. The two power supplies do not affect each other and work independently. This device avoids setting up a separate 48V battery to power the low-power system, and does not need to add an additional DCDC controller and wiring harness, so that the layout space utilization rate in the cabin is large and the vehicle cost is reduced.

[0024] The high voltage battery cell referred to in this embodiment generally refers to a battery cell with a voltage level between 200 V and 800 V, and the more common ones are 380 V and 800 V. In this embodiment, lithium battery cells are preferably used.

[0025] Embodiment 2: A 48V mild hybrid system with a high voltage power supply battery, comprising: High-voltage power supply battery, body controller, intelligent driving domain low-power equipment, chassis domain low-power equipment, entertainment domain low-power equipment, body domain low-power equipment, 48V electronically controlled compressor, 48V integrated starter generator; the high-voltage power supply battery has a first power output interface that can output 12V voltage and a second power output interface that can output 48V voltage, the first power output interface is electrically connected to the body controller, and the body controller is respectively connected to the intelligent driving domain low-power equipment, chassis domain low-power equipment, entertainment domain low-power equipment, and body domain low-power equipment; the second power output interface is respectively electrically connected to the 48V electronically controlled compressor and the 48V integrated starter generator.

[0026] Embodiment 3: A high voltage power supply method using a high voltage power supply battery, comprising: When the high-voltage power supply battery can supply power normally, after the low-power device sends a power request to the battery management system through the body controller, the battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the voltage of the high-voltage battery cell into a 12V voltage and outputs it to the body controller. After the body controller matches the power supply direction, it outputs the 12V voltage to the low-power device; when the high-voltage power supply battery cannot supply power normally, a 12V external power supply is used, and the battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the 12V external power supply voltage into a voltage that can charge the high-voltage battery cell, thereby charging the high-voltage battery cell.

[0027] When the high-voltage power supply battery can supply power normally, after the high-power device sends a power request to the battery management system, the battery management system controls the second DCDC conversion circuit of the high-voltage power supply battery to convert the voltage of the high-voltage battery cell into a 48V voltage, and outputs the 48V voltage to the high-power device; the high-power device includes: a 48V electronically controlled compressor and a 48V integrated starter generator. When the vehicle brakes during driving, the 48V integrated starter generator converts the 48V voltage into a voltage that can charge the high-voltage battery cell through the second DCDC conversion circuit of the high-voltage power supply battery, and charges the high-voltage battery cell.

[0028] Embodiment 4: A vehicle adopts a high-voltage power supply battery.

[0029] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A high voltage power supply battery, characterized in that: include: A high-voltage battery cell, a first DCDC conversion circuit, and a second DCDC conversion circuit; the first DCDC conversion circuit and the second DCDC conversion circuit are both integrated in the high-voltage battery cell battery pack, the high-voltage battery cell is connected to the first DCDC conversion circuit, the first DCDC conversion circuit has a first power output port, the voltage of the high-voltage battery cell is converted into a 12V voltage by the first DCDC conversion circuit, and is used to power low-power devices after the voltage is distributed by the body controller; the high-voltage battery cell is connected to the second DCDC conversion circuit, the second DCDC conversion circuit has a second power output port, the voltage of the high-voltage battery cell is converted into a 48V voltage by the second DCDC conversion circuit, and is used to power high-power devices.

2. The high voltage power supply battery according to claim 1, characterized in that: The first DCDC conversion circuit includes a first full-bridge hard switch tube, a first current doubler rectifier circuit, and a first solid-state aluminum electrolytic capacitor. The high-voltage battery cell is electrically connected to the first full-bridge hard switch tube, the first full-bridge hard switch tube is electrically connected to the first current doubler rectifier circuit, and the first current doubler rectifier circuit is electrically connected to the first solid-state aluminum electrolytic capacitor.

3. The high voltage power supply battery according to claim 1, characterized in that: The second DCDC conversion circuit includes a second full-bridge hard switch tube, a second current doubler rectifier circuit, and a second solid-state aluminum electrolytic capacitor. The high-voltage battery cell is electrically connected to the second full-bridge hard switch tube, the second full-bridge hard switch tube is electrically connected to the second current doubler rectifier circuit, and the second current doubler rectifier circuit is electrically connected to the second solid-state aluminum electrolytic capacitor.

4. The high voltage power supply battery according to claim 1, characterized in that: The high-voltage battery cell is a 380V high-voltage battery cell or an 800V high-voltage battery cell.

5. The high voltage power supply battery according to claim 1, characterized in that: The low-power devices include: low-power devices in the intelligent driving domain, low-power devices in the chassis domain, low-power devices in the entertainment domain, and low-power devices in the body domain.

6. The high voltage power supply battery according to claim 1, characterized in that: The high-power equipment includes: a 48V electronically controlled compressor and a 48V integrated starter generator.

7. A 48V mild hybrid system having a high-voltage power supply battery according to any one of claims 1 to 6, characterized in that: include: High-voltage power supply battery, body controller, intelligent driving domain low-power equipment, chassis domain low-power equipment, entertainment domain low-power equipment, body domain low-power equipment, 48V electronically controlled compressor, 48V integrated starter generator; the high-voltage power supply battery has a first power output interface that can output 12V voltage and a second power output interface that can output 48V voltage, the first power output interface is electrically connected to the body controller, and the body controller is respectively connected to the intelligent driving domain low-power equipment, chassis domain low-power equipment, entertainment domain low-power equipment, and body domain low-power equipment; the second power output interface is respectively electrically connected to the 48V electronically controlled compressor and the 48V integrated starter generator.

8. A high voltage power supply method using the high voltage power supply battery according to any one of claims 1 to 6, characterized in that: When the high-voltage power supply battery can supply power normally, after the low-power device sends a power request to the battery management system through the body controller, the battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the voltage of the high-voltage battery cell into a 12V voltage and output it to the body controller. After the body controller matches the power supply direction, it outputs the 12V voltage to the low-power device; after the high-power device sends a power request to the battery management system, the battery management system controls the second DCDC conversion circuit of the high-voltage power supply battery to convert the voltage of the high-voltage battery cell into a 48V voltage, and outputs the 48V voltage to the high-power device; When the high-voltage power supply battery cannot supply power normally, a 12V external power supply is used. The battery management system controls the first DCDC conversion circuit of the high-voltage power supply battery to convert the 12V external power supply voltage into a voltage that can charge the high-voltage battery cell, thereby charging the high-voltage battery cell.

9. The high voltage power supply method using a high voltage power supply battery according to claim 8, characterized in that: The high-power equipment includes: a 48V integrated starter generator. When the vehicle brakes during driving, the 48V integrated starter generator converts the 48V voltage into a voltage that can charge the high-voltage battery cell through the second DCDC conversion circuit of the high-voltage power supply battery, thereby charging the high-voltage battery cell.

10. A vehicle, characterized in that: A high voltage power supply battery as described in any one of claims 1 to 6 is used.

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