Low-voltage power supply system of new energy automobile

Abstract

The utility model discloses a low-voltage power supply system for a new energy automobile. The low-voltage power supply system comprises a storage battery, an automobile starting key, a charging gun, a diode K1, a diode K2, a diode K3, a diode K4, a relay KR1, a relay KR2, a relay KR3, a VCU, a BMS and an all-in-one controller. The storage battery is connected with the normal fire, the normal fire is connected with the diode K4, and the diode K4 is connected with the diode K2, the relay KR1, the relay KR2 and the relay KR3; the relay KR1 is connected with the VCU, the relay KR2 is connected with the all-in-one controller, the relay KR3 is connected with the BMS, and the VCU, the all-in-one controller and the BMS are connected with the storage battery; the ON fire is connected with the diode K3, and the diode K3 is connected with the diode K1 and the VCU; the VCU is connected with the all-in-one controller and the BMS; the charging gun is connected with the diode K2 and the diode K1. According to the utility model, the charging gun can be used for supplying power to the low-voltage system of the whole vehicle after the DCDC and the storage battery fail in the charging process, so that the power supply reliability of the low-voltage system is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply, and specifically relates to a low-voltage power supply system for new energy vehicles. Background Art

[0002] Currently, the power supply for the vehicle's low-voltage controller (LVC) relies on batteries, and the vehicle's electrical low-voltage system architecture is designed with this in mind. However, as batteries are used more frequently, their lifespan decreases, and their inherent charge retention capacity deteriorates. For plug-in new energy vehicles, when the battery charge is low, the driver uses a charging station. During this time, the battery supplies power to the vehicle's low-voltage system. After the vehicle is connected to high voltage, the DC / DC (Direct Current Control) (DCC) begins charging the battery. This is the current power distribution solution. However, in practice, the battery charge can deplete for various reasons, causing the vehicle's low-voltage system to fail. For example, if the DC / DC fails or the battery voltage is too low, the vehicle's low-voltage system can fail. If the battery overheats during charging, the VCU and battery cooling system become inoperative, posing a safety hazard and necessitating battery charging termination. Utility Model Content

[0003] The purpose of this utility model is to provide a low-voltage power supply system for new energy vehicles to avoid the problems of battery overheating and poor power supply reliability of the low-voltage system of the entire vehicle during the use of the charging pile of the new energy vehicle.

[0004] In order to achieve the above technical tasks, the present invention adopts the following technical solutions:

[0005] A low-voltage power supply system for a new energy vehicle includes a battery, a vehicle start key, a charging gun, a diode K1, a diode K2, a diode K3, a diode K4, a relay KR1, a relay KR2, a relay KR3, a VCU, a BMS, and an all-in-one controller, wherein:

[0006] The 24V+ of the battery is connected to the normal fire through the 24V switch, the normal fire is connected to the positive electrode of the diode K4, the cathode of the diode K4 is connected to the negative electrode of the diode K2, one end of the relay KR1, one end of the relay KR2, and one end of the relay KR3; the other end of the relay KR1 is connected to the VCU24V+, the other end of the relay KR2 is connected to the all-in-one controller 24V+, the other end of the relay KR3 is connected to the BMS24V+, the VCU24V-, the all-in-one controller 24V-, and the BMS24V- are respectively connected to the negative electrode of the battery;

[0007] The ON fire is connected to the positive electrode of diode K3, and the negative electrode of diode K3 is connected to the negative electrode of diode K1 and the ON wake-up circuit of VCU; the control circuit of VCU is connected to the wake-up circuit of all-in-one controller and BMS respectively;

[0008] The A+ of the charging gun is connected to the positive electrode of diode K2 and the negative electrode of diode K1 respectively.

[0009] Furthermore, the relays KR1, KR2, and KR3 are all four-pin relays.

[0010] Furthermore, the relays KR1, KR2, and KR3 are all JD2914 four-pin relays.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The utility model can ensure that the A+ and A- of the charging gun can be used to power the low-voltage system of the entire vehicle after the DCDC and the battery fail during the charging process, thereby improving the power supply reliability of the low-voltage system, eliminating the safety impact of the battery during the charging process, avoiding battery overheating, and protecting the personal and property safety of the driver on the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the system of the utility model.

[0014] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. DETAILED DESCRIPTION

[0015] like Figure 1 The low-voltage power supply system for new energy vehicles provided by the present invention includes a battery, a car start key, a charging gun, a diode K1, a diode K2, a diode K3, a diode K4, a relay KR1, a relay KR2, a relay KR3, a VCU (vehicle controller unit for electric vehicles), a BMS (battery management system) and an all-in-one controller, wherein:

[0016] The 24V+ of the battery is connected to the normal fire through the 24V switch, the normal fire is connected to the positive electrode of diode K4, the negative electrode of diode K4 is connected to the negative electrode of diode K2, one end of relay KR1, one end of relay KR2, and one end of relay KR3; the other end of relay KR1 is connected to VCU24V+, the other end of relay KR2 is connected to the 24V+ of the all-in-one controller, and the other end of relay KR3 is connected to BMS24V+. VCU24V-, all-in-one controller 24V-, and BMS24V- are respectively connected to the negative electrode (24-) of the battery;

[0017] The ON fire is connected to the positive electrode of diode K3, and the negative electrode of diode K3 is connected to the negative electrode of diode K1 and the ON wake-up circuit of VCU; the control circuit of VCU is connected to the wake-up circuit of all-in-one controller and BMS respectively;

[0018] The A+ of the charging gun is connected to the positive electrode of diode K2 and the negative electrode of diode K1 respectively.

[0019] Relays KR1, KR2, and KR3 all use four-pin relays, model JD2914.

[0020] The working process of this utility model is as follows:

[0021] like Figure 1 As shown, when the driver turns the key to the ON position or plugs the charging gun into the charging pile, the charging gun's low-voltage positive electrode A+ and low-voltage negative electrode A- are connected to the vehicle's low-voltage system and are no longer used;

[0022] (1) The battery distributes power to the VCU, BMS, and all-in-one controller;

[0023] (2) When the battery or the DCDC of the all-in-one controller fails, the low-voltage system power distribution is activated through the charging gun.

[0024] (3) The charging gun A+ supplies 24V of power to the VCU, BMS and all-in-one controller through diode K1;

[0025] (4) The charging gun A+ supplies power to the VCU controller through diode K2 to provide ON wake-up power;

[0026] (5) The VCU starts working through the power supply of the charging gun. At this time, the VCU controls the power supply to the BMS and the all-in-one controller to provide low-voltage wake-up power, and the BMS can work normally.

[0027] (6) The low-voltage system of the entire vehicle completes power distribution through the charging device.

Claims

1. A low-voltage power supply system for new energy vehicles, characterized in that: It includes a battery, a car start key, a charging gun, a diode K1, a diode K2, a diode K3, a diode K4, a relay KR1, a relay KR2, a relay KR3, a VCU, a BMS and an all-in-one controller, wherein: The 24V+ of the battery is connected to the normal fire through the 24V switch, the normal fire is connected to the positive electrode of the diode K4, the negative electrode of the diode K4 is connected to the negative electrode of the diode K2, one end of the relay KR1, one end of the relay KR2, and one end of the relay KR3; the other end of the relay KR1 is connected to the VCU24V+, the other end of the relay KR2 is connected to the all-in-one controller 24V+, the other end of the relay KR3 is connected to the BMS24V+, and the VCU24V-, the all-in-one controller 24V-, and the BMS24V- are connected to the negative electrode of the battery respectively; The ON fire is connected to the positive electrode of diode K3, and the negative electrode of diode K3 is connected to the negative electrode of diode K1 and the ON wake-up circuit of VCU; the control circuit of VCU is connected to the wake-up circuit of all-in-one controller and the wake-up circuit of BMS respectively; The A+ of the charging gun is connected to the positive electrode of diode K2 and the negative electrode of diode K1 respectively.

2. The new energy vehicle low-voltage power supply system according to claim 1, characterized in that: The relays KR1, KR2 and KR3 are all four-pin relays.

3. The new energy vehicle low-voltage power supply system according to claim 1 or 2, characterized in that: The relays KR1, KR2, and KR3 are all four-pin relays of model JD2914.

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