CN214254545U

CN214254545U - Electric automobile lithium cell low temperature starting drive

Info

Publication number: CN214254545U
Application number: CN202022783678.5U
Authority: CN
Inventors: 黄兴
Original assignee: Wuhan Bus Manufacturing Co ltd
Current assignee: Wuhan Bus Manufacturing Co ltd
Priority date: 2020-11-26
Filing date: 2020-11-26
Publication date: 2021-09-21
Anticipated expiration: 2030-11-26

Abstract

The utility model discloses a low-temperature starting device for a lithium battery of an electric automobile, which comprises a heat exchange pipeline and an energy feedback braking circuit; the heat exchange pipeline comprises a heating water tank, a water pump and a heat exchange pipe, and the heating water tank, the water pump and the heat exchange pipe form a circulating pipeline through communicating pipelines; the heat exchange tube is arranged in the lithium battery box, and a heating resistor is arranged in the heating water box; the energy feedback braking circuit is electrically connected with the heating resistor. The vehicle-mounted lithium battery is utilized, the discharging temperature is lower than the charging temperature, the heating resistor in the heat exchange pipeline is connected to the energy feedback braking circuit in series, the automobile is directly started in a low-temperature environment, then the energy feedback of the electric automobile is utilized to heat the battery, the time consumed by heating the battery independently is saved, the energy feedback is recycled, and the waste of resources is reduced.

Description

Electric automobile lithium cell low temperature starting drive

Technical Field

The utility model belongs to the technical field of electric automobile battery technique and specifically relates to an electric automobile lithium cell low temperature starting drive is related to.

Background

Generally, a lithium battery carried by a pure electric vehicle, particularly a lithium iron phosphate battery, has poor low-temperature performance, and the battery cannot discharge at the temperature below-20 ℃ and cannot be charged at the temperature of 0 ℃. When the vehicle is used in a cold area, the battery must be provided with a thermal management system, when the temperature of the battery is low, the battery thermal management system can be automatically started to heat the battery, the traditional battery heating modes are generally 2, the first mode adopts PTC heating in a battery box, the PTC is supplied with power to heat each battery system by adopting the battery system or an external power supply, and different battery boxes can be heated in a series or parallel mode; the liquid cooling battery box of the second scheme is characterized in that the whole vehicle is provided with a heat exchange water tank, the heat exchange water tank cooling liquid is heated through the battery or an external power supply, the cooling liquid battery box is circulated through a water pump and then returns to the heat exchange water tank, and the battery is heated through the medium of the cooling liquid.

The electric automobile has the function of braking energy feedback because the motor has the functions of electric driving and power generation, but under the condition that the temperature of the battery is lower (lower than 0 ℃), the battery is not suitable for charging, and energy feedback generated by the vehicle needs to be consumed through an energy consumption device for protecting the battery, so that energy is wasted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned technique not enough, provide an electric automobile lithium cell low temperature starting drive to solve current electric automobile's lithium cell can't charge the wasting of resources of causing the energy repayment under low temperature environment problem.

In order to achieve the above technical purpose, the technical scheme of the utility model provides an electric automobile lithium cell low temperature starting drive, it includes

The heat exchange pipeline comprises a heating water tank, a water pump and a heat exchange pipe, the heating water tank, the water pump and the heat exchange pipe form a circulation pipeline through communicating pipelines, the heat exchange pipe is arranged in the lithium battery box, and a heating resistor is arranged in the heating water tank;

and the energy feedback braking circuit is electrically connected with the heating resistor.

Preferably, the energy feedback braking circuit includes an inverter module electrically connected to the motor for controlling four-quadrant operation of the motor, an energy regulation transition module electrically connected to the inverter module and the heating resistor, respectively, for supporting dc voltage and filtering ripple current, and a chopper module electrically connected between the heating resistor and the energy regulation transition module for controlling voltage of the heating resistor.

Preferably, the heat exchange pipeline further comprises an expansion water tank, and the expansion water tank is arranged on the heat exchange pipe and is upwards provided with a pressure regulating window.

Preferably, the low-temperature starting device for the lithium battery of the electric automobile further comprises a pre-charging circuit.

Compared with the prior art, electric automobile lithium cell low temperature starting drive, it utilizes on-vehicle lithium cell, discharging temperature is less than charging temperature's low temperature characteristic, and in concatenating the heating resistor among the heat transfer pipeline to energy repayment braking circuit, make the car directly start under low temperature environment, then utilize electric automobile's energy repayment to heat the battery, not only practiced thrift and heated the consumed time alone to the battery, still carry out recycle to the energy repayment, the waste of resource has been reduced, heat the battery simultaneously, the temperature that makes the battery keeps satisfying the within range of charging and discharging simultaneously, the service life of battery has been prolonged.

Drawings

Fig. 1 is a schematic circuit diagram of a low-temperature starting device for a lithium battery of an electric vehicle according to the present invention;

fig. 2 is the utility model relates to a circuit schematic diagram of energy repayment braking circuit in electric automobile lithium cell low temperature starting drive.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, the utility model provides an electric automobile lithium cell low temperature starting drive, it includes heat transfer pipeline and energy repayment braking circuit. The heat exchange pipeline comprises a heating water tank 2, a water pump 3 and a heat exchange pipe 4, and the heating water tank 2, the water pump 3 and the heat exchange pipe 4 form a circulating pipeline through communicating pipelines; the heat exchange tube 4 is arranged in the lithium battery box 1, and a heating resistor R2 is arranged in the heating water tank 2; the energy feedback braking circuit is electrically connected with the heating resistor R2.

Considering that there may be the problem of thermal barrier shrinkage in the refrigerant in the pipeline, still include an expansion tank 5 in the heat transfer pipeline, expansion tank 5 sets up on heat exchange tube 4 to seted up a pressure regulating window up, through setting up expansion tank 5 and pressure regulating window, thereby for the refrigerant is heated the expansion and provides the expansion space, and adjust the internal and external pressure of body when the refrigerant receives the cold shrink.

The energy feedback braking circuit comprises an inverter module, an energy adjusting transition module and a chopper module, wherein the inverter module is electrically connected with the motor and used for controlling the four-quadrant operation of the motor, the energy adjusting transition module is respectively electrically connected with the inverter module and the heating resistor R2 and used for supporting direct current voltage and filtering ripple current, and the chopper module is electrically connected between the heating resistor R2 and the energy adjusting transition module and used for controlling the voltage of the heating resistor R2.

As shown in fig. 2, the energy feedback braking circuit includes an insulated gate bipolar transistor IGBT1, an IGBT2, an IGBT3, an IGBT4, an IGBT5, an IGBT6, an IGBT7, and an IGBT 8; freewheeling diodes D1, D2, D3, D4, D5, D6, D7, D8; and an energy storage capacitor C1; the three-phase inverter bridge is formed by the insulated gate bipolar transistors IGBT1, IGBT2, IGBT3, IGBT4, IGBT5, IGBT6 and free wheel diodes D1, D2, D3, D4, D5 and D6, and the chopper circuits are formed by the insulated gate bipolar transistors IGBT7, the IGBT8 and the free wheel diodes D7 and D8.

The vehicle-mounted lithium battery has the advantages that the low-temperature characteristic of the vehicle-mounted lithium battery is utilized, the discharging temperature is lower than the charging temperature, the vehicle can be directly started at a common low temperature, when the vehicle brakes, the direct current of the motor is inverted into the three-phase alternating current through the three-phase inverter bridge to control the operation of the motor, and when the electric vehicle brakes, the rotating magnetic field formed by U, V, W three-phase current in a motor winding lags behind the rotating magnetic field of a motor rotor, the driving motor becomes a generator, generated energy feedback is released to the heating resistor R2 through a chopper circuit, the heating resistor R2 is electrified to generate heat, the refrigerating fluid in the heating water tank 2 is heated, and the heated refrigerating fluid is pumped into the battery box by the water pump 3, so that the battery box is heated, and the temperature of the battery is rapidly increased to a proper temperature to work.

The low-temperature starting device for the lithium battery of the electric automobile further comprises a pre-charging circuit, wherein the pre-charging circuit comprises a resistor R1 and a contactor K1, the contactor K is a main contactor controlled by the motor, and the power on and the power off of the motor controller are controlled through R1, K1 and K.

Electric automobile lithium cell low temperature starting drive, it utilizes on-vehicle lithium cell, the discharge temperature is less than charging temperature's low temperature characteristic, and in concatenating the heating resistor in the heat transfer pipeline energy repayment brake circuit, make the car directly start under low temperature environment, then utilize electric automobile's energy repayment to heat the battery, not only practiced thrift and heated the consumed time alone to the battery, still carried out recycle to the energy repayment, the waste of resource has been reduced, heat the battery simultaneously, the temperature that makes the battery keeps satisfying the within range of charge-discharge simultaneously, the life of battery has been prolonged.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art would appreciate that the modules, elements, and/or method steps of the various embodiments described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. A low-temperature starting device for a lithium battery of an electric automobile is characterized by comprising

2. The device for low-temperature starting of the lithium battery of the electric vehicle as claimed in claim 1, wherein the energy feedback braking circuit comprises an inverter module electrically connected to the motor for controlling four-quadrant operation of the motor, an energy regulating transition module electrically connected to the inverter module and the heating resistor respectively for supporting a direct current voltage and filtering a ripple current, and a chopper module electrically connected between the heating resistor and the energy regulating transition module for controlling a voltage of the heating resistor.

3. The low-temperature starting device for the lithium battery of the electric automobile as claimed in claim 1, wherein the heat exchange pipeline further comprises an expansion water tank, and the expansion water tank is arranged on the heat exchange pipe and is provided with a pressure regulating window upwards.

4. The low-temperature starting device for the lithium battery of the electric vehicle as claimed in claim 1, wherein the low-temperature starting device for the lithium battery of the electric vehicle further comprises a pre-charging circuit.