Electric vehicle and high voltage system thereof, detection method for high voltage system and precharge circuit

A pre-charging circuit, high-voltage system technology, applied in electric vehicles, battery circuit devices, circuit devices, etc., to achieve the effect of reducing inrush current

Active Publication Date: 2017-04-19
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides an electric vehicle and its high-voltage system, detection method and pre-charging circuit, so as to at least solve the technical problem that there is an inrush current when the pre-charging relay is closed when a single pre-charging resistor is short-circuited

Method used

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  • Electric vehicle and high voltage system thereof, detection method for high voltage system and precharge circuit
  • Electric vehicle and high voltage system thereof, detection method for high voltage system and precharge circuit
  • Electric vehicle and high voltage system thereof, detection method for high voltage system and precharge circuit

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Embodiment 1

[0033] According to an embodiment of the present invention, an embodiment of a high-voltage system of an electric vehicle is provided, image 3 Is a schematic diagram of an electric vehicle high voltage system according to an embodiment of the present invention; Figure 4 It is a circuit diagram of an optional high voltage system for an electric vehicle according to an embodiment of the present invention. in Figure 4 Among them, BMS: battery management system for power battery; VMS: vehicle controller; capacitor C represents the equivalent capacitance of multiple high-voltage load input capacitors; K1: maintenance switch; K2: negative relay; K3: precharge relay; K4: Positive relay; R1 to Rn: precharge resistance; V1, V2, and V3 are voltage detection circuits; A is a current sensor. Mark A: Control terminal of negative relay, connected to BMS; Mark B: Control terminal of precharge relay, connected to BMS; Mark C: Control terminal of positive relay, connected to BMS; Mark D: Stat...

Embodiment 2

[0075] According to an embodiment of the present invention, an embodiment of a method for detecting a high-voltage system of an electric vehicle is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be implemented in a computer system such as a set of computer-executable instructions. Execution, and although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here.

[0076] Combine image 3 with Figure 4 It can be seen that the high-voltage system of the electric vehicle in the method embodiment of the present application may include: a power battery circuit, the power battery circuit may include a power battery and a negative relay K2, the first end of the negative relay K2 is connected to the negative electrode of the power battery; A pre-charge circuit connected in series with the battery circuit. The pre-charge circuit includes: a pre-charge relay K3 a...

Embodiment 3

[0120] According to an embodiment of the present invention, a precharge circuit is provided, and the precharge circuit can be set in such as Figure 4 Between the power battery circuit and the high-voltage load of the high-voltage system shown, the pre-charging circuit may include:

[0121] The first sub-precharge circuit includes: a positive relay K4.

[0122] The second sub-precharge circuit is connected in parallel with the first sub-precharge circuit and includes: a pre-charge relay K3 connected in series and a pre-charge resistor matrix, the pre-charge resistor matrix includes a plurality of pre-charge resistors.

[0123] In the embodiment of the present application, the pre-charging resistor matrix composed of a plurality of pre-charging resistors is arranged in the pre-charging circuit to realize the technical problem of inrush current at the moment when the pre-charging relay is closed when a single pre-charging resistor is short-circuited.

[0124] Optionally, the above-mentio...

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Abstract

The invention discloses an electric vehicle and a high voltage system thereof, a detection method for the high voltage system and a precharge circuit. The high voltage system of the electric vehicle comprises a traction battery circuit, the precharge circuit which is connected in series with the traction battery circuit and a controller, wherein the traction battery circuit comprises a traction battery and a negative electrode relay and the first end of the negative electrode relay is connected to the negative electrode of the traction battery; the precharge circuit comprises a precharge relay and a precharge resistor matrix which are connected in parallel with a positive electrode relay, and the precharge relay is connected in series with the precharge resistor matrix which comprises a plurality of precharge resistors; and the controller is respectively connected with the positive electrode relay, the negative electrode relay and the precharge relay, for controlling the connection in proper order of the negative electrode relay, the precharge relay and the positive electrode relay to enable the safe power-on of the high voltage system by the precharge resistor matrix. The electric vehicle and the high voltage system thereof,, the detection method for the high voltage system and the precharge circuit solve the technical problem of the occurrence of impulse currents at the moment of closing the precharge relay in the case of a short circuit of a single precharge resistor.

Description

Technical field [0001] The invention relates to the field of new energy vehicles, in particular to an electric vehicle and its high-voltage system, a detection method and a pre-charging circuit. Background technique [0002] New energy vehicles (such as pure electric vehicles, hybrid vehicles and fuel cell vehicles) contain two voltage systems, low voltage and high voltage. Among them, the low-voltage system is used as the control system of new energy vehicles, and the high-voltage system is used as the energy supply system and driving system of new energy vehicles. The voltage level of the high voltage system is generally higher than 200V, with the characteristics of high voltage and large current, which exceeds the safety voltage range of personnel. The energy supply system of new energy vehicles includes a battery system. The load of the battery system is multiple high-voltage load components such as the motor system. In order to ensure the stability of the input terminal vol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L11/18H02J7/00
CPCG01R31/327H02J7/00B60L50/60Y02T10/70
Inventor 邵桂欣
Owner BEIJING ELECTRIC VEHICLE
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