Power supply system for low-voltage electric equipment of new energy automobile

Abstract

The utility model discloses a power supply system for low-voltage electric equipment of a new energy automobile, and relates to the technical field of automobile power supply equipment. The system comprises a whole vehicle low-voltage electric component and a power battery assembly, the power battery assembly comprises a BMS battery management unit, a main positive relay, a main negative relay and a battery module, and the battery module is connected with the whole vehicle power component through the main positive relay and the main negative relay; the control module of the BMS battery management unit is connected with the control ends of the main positive relay and the main negative relay; the data acquisition module of the BMS battery management unit is connected with the two ends of the battery module; the system further comprises a DCDC conversion unit, the input end of the DCDC conversion unit is connected with the battery module, and the output end of the DCDC conversion unit is connected with the input end of the whole vehicle low-voltage electric component and the power port of the BMS battery management unit. Compared with the prior art, the power supply system for the low-voltage electric equipment of the new energy automobile is stable in power supply and not easy to damage.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile power supply equipment, especially a new energy automobile low voltage power supply system for electrical equipment. BACKGROUND

[0002] New energy vehicles have a wide variety of low-voltage electrical equipment. These devices mainly operate at 12V, 24V, or 48V low voltage to ensure the normal operation of the vehicle and the comfort of passengers. The current power supply system for new energy vehicle low-voltage electrical equipment, as shown in Figure 1 , includes a vehicle low-voltage electrical component 101, a lead-acid battery 102, and a power battery assembly. The power battery assembly includes a BMS battery management unit 103, a main positive relay 104, a main negative relay 105, and a battery module 106. The battery module 106 is connected to the vehicle power component 107 through the main positive relay 104 and the main negative relay 105. The control module of the BMS battery management unit 103 is connected to the control terminals of the main positive relay 104 and the main negative relay 105. The data acquisition module of the BMS battery management unit 103 is connected to both ends of the battery module 106. The vehicle low-voltage electrical component 101 and the BMS battery management unit 103 are both powered by the lead-acid battery 102. This power supply system has the following problems: 1. The lead-acid battery has a short service life and high replacement cost. In addition, under low environmental temperature or long standby conditions, the lead-acid battery is prone to power feeding or damage, resulting in the vehicle being unable to start and affecting user experience. 2. The lead-acid battery is an independent component that needs to be arranged in a designated place, occupying the vehicle's layout space. Moreover, the designated layout position of the lead-acid battery is far from the BMS battery management unit, and the connection line is long, resulting in power supply loss and instability. Since the BMS battery management unit is responsible for controlling the attraction and disconnection of the main positive relay and the main negative relay, as well as data acquisition of the battery module, once the power supply is disconnected during vehicle operation, the main positive relay and the main negative relay will also be disconnected, causing the vehicle power component to suddenly lose power and posing a safety risk. SUMMARY

[0003] The utility model aims to provide a new energy automobile low voltage power supply system for electrical equipment that is stable and less likely to be damaged.

[0004] In order to solve the above problems, the utility model adopts the technical scheme: this new energy automobile low -voltage electrical equipment power supply system, including whole vehicle low -voltage electrical component and power battery assembly, the power battery assembly includes BMS battery management unit, main positive relay, main negative relay and battery module, the battery module is connected with whole vehicle power component through main positive relay Main negative relay, the control module of BMS battery management unit is connected with the control end of main positive relay, main negative relay, the data acquisition module of BMS battery management unit is connected with the both ends of battery module, still include DCDC conversion unit, the input of DCDC conversion unit is connected with battery module, and the output is connected with the input of whole vehicle low -voltage electrical component and the power port of BMS battery management unit.

[0005] In the above technical scheme, more specific technical scheme can also be: the DCDC conversion unit is equipped with control chip, and the control chip is connected with the chip module of BMS battery management unit.

[0006] Further, the control chip is connected with the chip module through a control signal line.

[0007] Further, the DCDC conversion unit includes a voltage conversion module, a filter and a voltage stabilizing module.

[0008] Further, the voltage conversion module is arranged at the input end of the DCDC conversion unit, and the voltage stabilizing module is arranged at the output end of the DCDC conversion unit.

[0009] Further, the filter is arranged between the voltage conversion module and the voltage stabilizing module.

[0010] Due to the adoption of the above technical scheme, the utility model has the following beneficial effects compared with the prior art:

[0011] The utility model cancels the lead-acid storage battery of the existing power supply system, converts the high-voltage electricity of the battery module into low-voltage electricity through the DCDC conversion unit, and provides the whole vehicle low-voltage electrical component and the BMS battery management unit for use, which not only reduces the cost, saves the installation space, and the battery module has the advantages of long service life and high safety, also has the liquid cooling liquid heating function, has the special safety valve, and is not easy to appear the power supply or damage, supports long standby at the same time, and the battery module power supply distance is short, the line loss rate is low, and the power supply reliability is high, so that it can provide stable voltage in any environment, and guarantees the driving safety. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the structural schematic diagram of the prior art;

[0013] Figure 2It is the structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0014] The utility model makes further detailed description in combination with the following embodiment:

[0015] As Figure 2 The new energy automobile low pressure electric equipment power supply system shown in the figure, including whole vehicle low pressure electric component 1, power battery assembly and DCDC conversion unit 2;Power battery assembly includes BMS battery management unit 3, main positive relay 4, main negative relay 5 and battery module 6, and battery module 6 is connected with whole vehicle power component 7 through main positive relay 4, main negative relay 5;The control module of BMS battery management unit 3 is connected with the control end of main positive relay 4 and main negative relay 5, and the data acquisition module of BMS battery management unit 3 is connected with both ends of battery module 6;The input end of DCDC conversion unit 2 is connected with battery module 6, and the output end is connected with the input end of whole vehicle low pressure electric component 1 and the power port of BMS battery management unit 3.

[0016] DCDC conversion unit 2 includes control chip, voltage conversion module, filter and voltage stabilizing module, and the chip module of BMS battery management unit 3 is connected with the control chip through control signal line.

[0017] Voltage conversion module is arranged at the input end of DCDC conversion unit 2, voltage stabilizing module is arranged at the output end of DCDC conversion unit 2, and filter is arranged between voltage conversion module and voltage stabilizing module.

[0018] The utility model in usage, through DCDC conversion unit 2 real time first shunt battery module 6's high voltage electricity is converted into low voltage electricity, provides whole vehicle low pressure electric component 1 and BMS battery management unit 3 with use;When new energy automobile enters low power consumption state, DCDC conversion unit 2 synchronously enters low power consumption state, and when new energy automobile has needs, BMS battery management unit 3 receives demand signal, and through control signal line awakens DCDC conversion unit 2, lets it enter working state.Voltage conversion module of DCDC conversion unit 2 is used to reduce the high voltage of battery module 6 into low voltage, filter carries out filtering processing to the low voltage after reduction, and voltage stabilizing module makes the output low voltage keep stable.

[0019] The utility model can replace the DCDC conversion unit of different parameters according to the specific low voltage electric equipment demand, to reach the purpose of outputting different low voltage values.

[0020] The utility model cancels the lead -acid battery of existing power supply system, through DCDC conversion unit, high voltage electricity of battery module is converted into low voltage electricity, provides low voltage electric component and BMS battery management unit use, not only reduces cost, saves installation space, and battery module has long life, high security advantage, also has liquid cooling liquid heat function, has special safety valve, and it is not easy to appear the situation of power supply or damage, supports long standby simultaneously, furthermore, the power supply distance of battery module is short, and the line loss rate is low, and the power supply reliability is high, so that it can provide stable voltage in any environment, guarantees the traffic safety.

[0021] Need to explain, the power supply system provided by the utility model, the control method involved is the common method of prior art, which does not involve any improvement in control method and software, and the connection mode between the devices of each corresponding function is realized by the prior art by the person skilled in the art, which is not described in detail here.

Claims

1. A new energy vehicle low-voltage electrical equipment power supply system, comprising a vehicle low-voltage electrical component and a power battery assembly, the power battery assembly comprising a BMS battery management unit, a main positive relay, a main negative relay and a battery module, the battery module being connected with a vehicle power component through the main positive relay and the main negative relay; a control module of the BMS battery management unit being connected with control ends of the main positive relay and the main negative relay, and a data acquisition module of the BMS battery management unit being connected with both ends of the battery module; characterized in that: The DCDC conversion unit is further provided, an input end of the DCDC conversion unit is connected with the battery module, and an output end of the DCDC conversion unit is connected with an input end of the low-voltage electrical component of the whole vehicle and a power supply port of the BMS battery management unit. ​ 2. The new energy vehicle low-voltage electrical equipment power supply system according to claim 1, characterized in that: The DCDC conversion unit is provided with a control chip, and the control chip is connected with a chip module of the BMS battery management unit.

3. The new energy vehicle low-voltage electrical equipment power supply system according to claim 2, characterized in that: The control chip is connected with the chip module through a control signal line.

4. The new energy vehicle low-voltage electrical equipment power supply system according to any one of claims 1 to 3, characterized in that: The DCDC conversion unit comprises a voltage conversion module, a filter and a voltage stabilizing module.

5. The new energy vehicle low-voltage electrical equipment power supply system according to claim 4, characterized in that: The voltage conversion module is arranged at an input end of the DCDC conversion unit, and the voltage stabilizing module is arranged at an output end of the DCDC conversion unit.

6. The new energy vehicle low-voltage electrical equipment power supply system according to claim 5, characterized in that: The filter is arranged between the voltage conversion module and the voltage stabilizing module.

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