CN205381154U - Energy supplied system of electric automobile lithium cell - Google Patents

Abstract

The utility model discloses an energy supplied system of electric automobile lithium cell for electric automobile's energy storage and distribution are connected in parallel in the motor of lithium cell group (1) and car and energy recuperation system (2) and are provided with three super capacitor. Adopt the utility model discloses system's lithium cell seldom has the heavy current charge -discharge to strike, extension lithium battery life that can be very big, and super capacitor is longe -lived moreover, and system's bulk life time obtains the extension, has reduced the big current discharge's of lithium cell operating mode, the security that has improved the battery. Because the electric current changes not quite, can be conveniently appraise with the battery the residual capacity of lithium cell balanced, reduction battery management system's algorithm complexity. The recovered energy directly stores super capacitor into, needn't fill lithium cell group in electronic, but the direct power feeding machine use, improved energy recuperation's utilization ratio, reduce battery use cost.

Description

Energy supply system for lithium battery of electric vehicle

technical field

The utility model relates to the technical field of electric vehicle energy storage and release, in particular to an energy system topology structure with a supercapacitor and a lithium battery and a control strategy thereof.

Background technique

Supercapacitors have the characteristics of high charging and discharging power, fast charging and discharging speed, and long life. Lithium batteries have the characteristics of high energy density. At present, supercapacitors on existing electric vehicles are mainly used for vehicle starting and braking energy recovery. Lithium batteries Directly supply power to the motor and other electric accessories. During the process of driving the motor, the current flowing through the lithium battery is very large and will change frequently. This is one of the key factors leading to the shortening of the life of the lithium battery. From the lithium battery material and Structurally improving the service life of frequent high-current charging and discharging will also lead to an increase in the cost of lithium batteries.

Utility model content

In order to overcome the problem of shortened service life caused by frequent high-current charging and discharging of lithium batteries, the utility model provides an energy management system with supercapacitors and lithium batteries.

The technical scheme adopted in the utility model is:

An energy supply system for lithium batteries of electric vehicles is used for energy storage and distribution of electric vehicles. Three supercapacitors are arranged in parallel between the lithium battery pack 1 and the motor and energy recovery system 2 of the vehicle, namely the first supercapacitor 10, the second supercapacitor 20 and the third supercapacitor 30; between the lithium battery pack 1 and the three supercapacitors A first control circuit A for controlling the time-sharing charging of three supercapacitors is provided between the capacitors; a control circuit A for controlling the first supercapacitor 10 and the second supercapacitor 20 is arranged between the three supercapacitors and the motor and the energy recovery system 2 A second control circuit B that supplies power to the motor and the energy recovery system 2 to drive the motor, and controls the charging and discharging of the third supercapacitor 30 and the motor and the energy recovery system 2 .

The lithium battery pack is connected with the low-power electric accessories in the car to supply power for the low-power electric accessories in the car. The lithium battery pack is connected with the low-power electric accessories in the car to supply power for the low-power electric accessories in the car.

Energy control strategy for lithium batteries in electric vehicles: lithium batteries directly supply power to low-power automotive electric accessories; supercapacitors are used to directly supply power to high-power consumption motors; lithium battery packs continuously charge supercapacitors with constant current.

In this way, the grid charges the lithium battery through the charging port, and the lithium battery directly supplies power to the electric accessories of the car with low power consumption, while for the motor with high power consumption, the supercapacitor is used to directly supply power, and the lithium battery pack continuously charges the supercapacitor with a constant current. At the same time, the supercapacitor stores the recovered energy, which reduces the frequent high-current charging and discharging of the lithium battery and prolongs the service life of the lithium battery.

Compared with the prior art, the beneficial effects of the utility model are as follows:

The lithium battery is almost discharged at a constant current, and there are few high-current charge and discharge shocks, which can greatly prolong the life of the lithium battery, and the super capacitor has a long life, and the overall life of the system is extended.

It reduces the working conditions of high-current discharge of the lithium battery and improves the safety of the battery.

Since the current does not change much, it will be convenient to estimate the remaining power of the lithium battery and balance the battery, and reduce the algorithm complexity of the battery management system.

Supercapacitors can output high power and respond well to various working conditions of the motor.

The recovered energy is directly stored in the supercapacitor without being charged into the electric lithium battery pack, and can be directly used by the power supply, which improves the utilization rate of energy recovery.

It can reduce the cost of the battery. Since the lithium battery used in this mode does not need to be reliable under high current discharge and frequent alternating current discharge, a battery with lower performance can be used, but it will not affect the performance of the vehicle.

Description of drawings

Figure 1 is a block diagram of an energy supply system with supercapacitors and lithium batteries. In the figure: Lithium battery pack 1, motor and energy recovery system 2 of the car, low-power electrical accessories in the car 3, charging, 4; first supercapacitor 10, second supercapacitor 20, third supercapacitor 30; first Control circuit A, second control circuit B.

detailed description

Below in conjunction with specific embodiment, further set forth the utility model. It should be understood that these embodiments are only used to illustrate the present utility model and are not intended to limit the scope of the present utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the application.

The implementation mode adopted by the utility model relates to an energy management and control system with a supercapacitor and a lithium battery, including: a charging port 4, a lithium battery pack 1, a motor and an energy recovery system 2, and a low-power electric auxiliary system in the car Part 3, the first supercapacitor 10, the second supercapacitor 20, the third supercapacitor 30, the first control circuit A, and the second control circuit B.

The lithium battery pack is connected to the charging port 4 to charge the lithium battery.

The lithium battery pack is connected with the low-power electric accessories in the car to supply power for the low-power electric accessories in the car.

The lithium battery pack is connected in parallel with the first control circuit A, the first supercapacitor 10, the second supercapacitor 20, and the third supercapacitor 30, respectively.

The first supercapacitor 10, the second supercapacitor 20, and the third supercapacitor 30 are connected to the motor through a control circuit to drive the motor to move.

The first supercapacitor 10, the second supercapacitor 20, and the third supercapacitor 30 are connected to the energy recovery mechanism through the second control circuit B, and the supercapacitors store recovered energy.

In the utility model, the specific implementation of the control method of the energy management system with a supercapacitor and a lithium battery is as follows:

First check the integrity of the control system circuit, and if it is correct, the lithium battery directly supplies power to the vehicle electrical accessories, and charges the first supercapacitor 10 by controlling the first control circuit A, and the second supercapacitor 20 is charged by the second control circuit B. The motor supplies power. When the remaining 20% of the supercapacitor power 2 is used, the first supercapacitor 10 is connected, and the second supercapacitor 20 is controlled by the second control circuit B to disconnect the connection with the motor when the power is exhausted. The control circuit A controls the lithium battery to be connected to the second supercapacitor 20 to charge the second supercapacitor 20, and the first supercapacitor 10 and the second supercapacitor 20 are charged and discharged in such a cycle;

The third supercapacitor 30 is connected to the energy recovery system through the second control circuit B to store the recovered energy. When the third supercapacitor 30 is fully charged, the third supercapacitor 30 is connected to the motor by the second control circuit B to supply power for the motor. At this time, the recovered energy is stored in the first supercapacitor 10 and the second supercapacitor 20 with a lower charge, and if both are fully charged, it is stored in the lithium battery.

Claims (3)

1. the energy supply system of an electric automobile lithium battery, energy for electric automobile stores and distribution, it is characterized in that, three super capacitors have been arranged in parallel it between the motor and energy-recuperation system (2) of lithium battery group (1) and automobile, i.e. the first super capacitor (10), the second super capacitor (20) and the 3rd super capacitor (30)；The first control circuit (A) for controlling to provide three super capacitor time-sharing charging it is provided with between lithium battery group (1) and three super capacitors；It is provided with between three super capacitors and motor and energy-recuperation system (2) for controlling the first super capacitor (10) and the second super capacitor (20) wheel flow direction motor with energy-recuperation system (2) for electric drive motor motion, and controls the second control circuit (B) of the 3rd super capacitor (30) and motor with energy-recuperation system (2) discharge and recharge.

2. the energy supply system of electric automobile lithium battery according to claim 1, it is characterised in that described lithium battery group is connected with the electric auxiliary of low-power in car (3), powers for low-power electro auxiliary in car.

3. the energy supply system of electric automobile lithium battery according to claim 1, it is characterised in that: described first control circuit (A) controls lithium battery group to super capacitor constant-current charge.