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Electric vehicle power system and control method thereof

A technology for electric vehicles and power systems, applied in circuits, electrical components, secondary batteries, etc., can solve the problems affecting the performance of electric vehicles and the rapid decline of battery capacity, and achieve the effect of improving performance and charging and discharging performance.

Inactive Publication Date: 2013-08-07
哈尔滨市德昌电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the capacity of the battery of the existing electric vehicle drops too fast under low temperature conditions, which affects the performance of the electric vehicle, and provides a power system of the electric vehicle and a control method thereof

Method used

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  • Electric vehicle power system and control method thereof
  • Electric vehicle power system and control method thereof
  • Electric vehicle power system and control method thereof

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specific Embodiment approach 1

[0027] Specific implementation mode one: the following combination figure 1 Describe this embodiment, the electric vehicle power system described in this embodiment, it comprises first energy unit 10, diode 11, second energy unit 12, driving circuit 14, motor 16 and controller 20, it also comprises heating circuit 101, Temperature detection device 102 and temperature control device 103;

[0028] The first electrical signal output end of the first energy unit 10 is connected to the anode of the diode 11, the cathode of the diode 11 is connected to the first electrical signal output end of the second energy unit 12, and the first electrical signal output end of the second energy unit 12 is connected to the driver The first electrical signal input end of the circuit 14, the second electrical signal output end of the first energy unit 10 and the second electrical signal output end of the second energy unit 12 are simultaneously connected to the second electrical signal input end o...

specific Embodiment approach 2

[0041] Specific implementation mode two: the following combination figure 2 This embodiment will be described. This embodiment will further describe Embodiment 1. The first energy unit 10 is a lithium battery or a lithium battery pack, and the second energy unit 12 is a supercapacitor or a supercapacitor pack.

[0042] In this embodiment, the second energy unit 12 adopts a supercapacitor or a supercapacitor bank, and the controller 20 controls the bidirectional flow of energy between the second energy unit 12 and the motor 16 . Specifically, when the electric vehicle is working in acceleration or uphill mode, the motor 16 is working in an electric state, and the energy in the power system of the electric vehicle flows from the first energy unit 10 and the second energy unit 12 to the motor 16 . When the electric vehicle works in deceleration or downhill mode, the motor 16 works in a braking state, and the energy of the power system of the electric vehicle flows from the motor 1...

specific Embodiment approach 3

[0043] Specific implementation mode three: the following combination figure 2 This embodiment will be described. This embodiment will further describe Embodiment 1. The temperature control device 103 is a switch device, and the temperature control signal 203 is a switch signal.

[0044] In this embodiment, the switching device 103 may include but not limited to the following devices: a contactor, a power switching device and any other suitable components.

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Abstract

The invention discloses an electric vehicle power system and a control method thereof, and belongs to the field of electric vehicles, in order to solve the problem that performances of the electric vehicle are influenced by fast capacity decrease of an existing electric vehicle battery at low temperature. The electric vehicle power system provided by the invention comprises a first energy unit, a diode, a second energy unit, a driving circuit, a motor, a controller, a heating circuit, a temperature detecting device and a temperature control device, wherein the driving circuit is used for driving the motor to rotate; the heating circuit is used for converting electricity energy provided by the second energy unit into heat energy, and transferring the heat energy to the first energy unit through a medium; the temperature detecting device is used for detecting an operation environment temperature of the first energy unit, and transmitting a temperature signal to the controller; the controller outputs a temperature control signal to the temperature control device according to the received temperature signal; the temperature control device controls the heat energy converted by the heating circuit according to the temperature control signal; and the controller is used for outputting a control signal to the driving circuit. The electric vehicle power system and the control method thereof provided by the invention are applied to the field of the electric vehicles, and especially in alpine areas.

Description

technical field [0001] The invention belongs to the field of electric vehicles, and in particular relates to an electric vehicle power system and a control method thereof. Background technique [0002] With the aggravation of energy crisis and environmental pollution caused by fossil fuel exhaust, electric vehicles have received more and more attention. In the power system of electric vehicles, lithium batteries are often used as electric vehicle batteries. However, the use of lithium batteries as a single energy storage unit often has disadvantages such as low energy and short life. Therefore, a dual-energy system in which lithium batteries and supercapacitors are connected in parallel is often used as an energy storage unit. However, under low temperature conditions, the capacity of lithium batteries decreases rapidly. Therefore, in some alpine regions, low temperature conditions are the main factor limiting the application of lithium batteries in electric vehicles. [...

Claims

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Application Information

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IPC IPC(8): H01M10/50H01M10/625H01M10/635
CPCY02E60/12Y02E60/10
Inventor 张剑韬王慧杰张吉荣张云鹏张佰超
Owner 哈尔滨市德昌电气有限公司
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