CN209888665U - A rear-mounted energy storage device for an electric vehicle - Google Patents

Abstract

The utility model discloses an electric automobile rear energy storage device, which comprises a voltage reduction rectifier module, a harmonic filtering module, a protection switch, a standby battery, a one-way electronic switch and a voltage detection module, wherein the input end of the voltage reduction rectifier module is connected with a mains supply, the output end of the voltage reduction rectifier module is connected with the harmonic filtering module, the output end of the harmonic filtering module is connected with the protection switch, and the protection switch is also respectively connected with the standby battery and a main battery, the design requirement of the backup battery can be reduced by indirectly supplying power through the main battery.

Description

A rear-mounted energy storage device for an electric vehicle

technical field

The utility model relates to the technical field of electric vehicles, in particular to a rear energy storage device of an electric vehicle.

Background technique

The development of new energy vehicles in my country is an important measure to reduce vehicle fuel consumption, alleviate the contradiction between fuel supply and demand, reduce exhaust emissions, improve the atmospheric environment, and promote the progress and optimization and upgrading of automobile technology. need. Countries such as Europe, America and Japan all regard new energy vehicles as a strategic commanding height, and the state invests in strengthening the development of the industry.

According to the "2016-2021 China's New Energy Vehicle Industry Market Prospect and Investment Strategic Planning Analysis Report" by the Prospective Industry Research Institute, the production and sales of new energy vehicles in my country in 2018 reached 1.34 million and 1.33 million respectively, a year-on-year increase of 3.3%. times and 3.4 times. my country's new energy vehicle sales surpassed the United States for the first time, becoming the world's largest new energy vehicle market. In January 2019, my country produced 56,000 new energy vehicles, a year-on-year increase of 144%.

The production and sales of new energy vehicles exceeded market expectations, which was not only due to the policy promotion of the central and local governments, but also to the changes in the consumption concept of car owners and the efforts of auto companies.

The biggest problem with existing electric vehicles is the cruising range. Although most electric vehicles give a high cruising range, this cruising range can only be achieved in an ideal climate environment, and the decrease in temperature and the loss of time will cause the power of electric vehicles to decrease. , and then seriously affect the cruising range. The most typical case is that the cruising range in winter rain and snow is less than 2/3 of the maximum cruising range. Therefore, many people are equipped with backup batteries in the trunk of electric vehicles, but most of the existing backup batteries are directly powered, and most of them need to be matched with various electrical equipment of electric vehicles. Therefore, their quality requirements are very high, and they need to be matched with the original main battery. The quality is the same or even higher, so the cost of use is higher.

Utility model content

The purpose of the present invention is to provide a rear-mounted energy storage device for an electric vehicle to solve the problems raised in the background art.

To achieve the purpose, the utility model provides the following technical solutions:

A rear-mounted energy storage device for an electric vehicle, comprising a step-down rectifier module, a harmonic filtering module, a protection switch, a backup battery, a one-way electronic switch and a voltage detection module, wherein the input end of the step-down rectifier module is connected to a commercial power supply , the output end of the step-down rectifier module is connected to the harmonic filter module, the output end of the harmonic filter module is connected to the protection switch, the protection switch is also connected to the backup battery and the main battery, the main battery is also connected to the voltage detection module, and the backup battery is also connected to The one-way electronic switch is connected to the main battery, and the voltage detection module is also connected to the main battery.

As a further solution of the present invention: the step-down rectifier module includes a rectifier T and a transformer W, the harmonic filtering module adopts a π-type filter, the protection switch includes a resistor R1, a resistor R2 and a triode V1, and the one-way electronic switch includes Transistor V2 and diode D1, the voltage detection module includes resistor R4 and resistor R5, the primary winding of transformer W is connected to 220V AC, the secondary winding of transformer W is connected to rectifier T, the output port 2 of rectifier T is connected to port 1 of the π-type filter, The port 2 of the π-type filter is connected to the output port 4 of the rectifier T, the port 3 of the π-type filter is connected to the collector of the triode V1 and the resistor R1, and the other end of the resistor R1 is connected to the resistor R2 and the base of the triode V1. The emitter is connected to the switch S1 and the resistor R3, the other end of the resistor R3 is connected to the switch S2, the other end of the resistor R2 is connected to the negative electrode of the backup battery E1, the negative electrode of the main battery E2, the capacitor C3, the resistor R5 and the port 4 of the π-type filter, The other end of the switch S1 is connected to the emitter of the transistor V2 and the positive electrode of the backup battery E1, the collector of the transistor V2 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the positive electrode of the main battery E2, the other end of the capacitor C3, the resistor R4 and the switch The other end of S2, the other end of the resistor R4 is connected to the other end of the resistor R5 and the base of the transistor V2.

As a further solution of the present invention, the π-type filter is composed of an inductor L1, a capacitor C1 and a capacitor C2.

As a further solution of the present invention: the diode D1 is a rectifier diode.

As a further solution of the present invention, the triode V1 is an NPN triode, and the triode V2 is a PNP triode.

Compared with the prior art, the beneficial effect of the utility model is: the electric vehicle rear energy storage device of the utility model is a backup battery installed in the trunk of the electric vehicle, and is used in conjunction with the original main battery of the electric vehicle. Only when the main battery voltage of the car is insufficient will it start and charge the main battery. On the one hand, it increases the battery life of the electric car. On the other hand, the backup battery is not directly supplied to the electric part of the electric car. The main battery is used for indirect power supply, which can reduce the design requirements of the backup battery.

Description of drawings

Figure 1 is a schematic diagram of a rear energy storage device for an electric vehicle.

FIG. 2 is a circuit diagram of a rear energy storage device of an electric vehicle.

Figure 3 is a circuit diagram of the filter.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Embodiment 1: Please refer to Figures 1-3, a rear-mounted energy storage device for an electric vehicle, including a step-down rectifier module for AC-AC and AC-DC conversion, and a harmonic filter module for filtering harmonic interference , A protection switch, a backup battery, a one-way electronic switch and a voltage detection module for providing undervoltage protection, the input end of the step-down rectifier module is connected to the commercial power supply, and the output end of the step-down rectifier module is connected to the harmonic filter module , the output end of the harmonic filter module is connected to the protection switch, the protection switch is also connected to the backup battery and the main battery, the main battery is also connected to the voltage detection module, the backup battery is also connected to the main battery through a one-way electronic switch, and the voltage detection module is also connected to the main battery. Battery.

The specific circuit is shown in Figure 2, the step-down rectifier module includes a rectifier T and a transformer W, the harmonic filtering module adopts a π-type filter, the protection switch includes a resistor R1, a resistor R2 and a triode V1, and the one-way electronic switch includes a triode V2 and diode D1, the voltage detection module includes resistor R4 and resistor R5, the primary winding of the transformer W is connected to 220V AC, the secondary winding of the transformer W is connected to the rectifier T, the output port 2 of the rectifier T is connected to the port 1 of the π-type filter, π The port 2 of the type filter is connected to the output port 4 of the rectifier T, the port 3 of the π-type filter is connected to the collector of the transistor V1 and the resistor R1, the other end of the resistor R1 is connected to the resistor R2 and the base of the transistor V1, and the transmitter of the transistor V1 The pole is connected to the switch S1 and the resistor R3, the other end of the resistor R3 is connected to the switch S2, the other end of the resistor R2 is connected to the negative electrode of the backup battery E1, the negative electrode of the main battery E2, the capacitor C3, the resistor R5 and the port 4 of the π-type filter, the switch The other end of S1 is connected to the emitter of transistor V2 and the positive electrode of backup battery E1, the collector of transistor V2 is connected to the anode of diode D1, the cathode of diode D1 is connected to the positive electrode of main battery E2, the other end of capacitor C3, resistor R4 and switch S2 The other end of the resistor R4 is connected to the other end of the resistor R5 and the base of the transistor V2.

The transformer W in the circuit completes the step-down, the rectifier T converts the alternating current into direct current, and the π-type filter can filter out the harmonic interference in the power grid. The voltage after the voltage control controls the conduction state of the NPN transistor V1, so when its divided voltage is not enough to meet the conduction of the NPN transistor V1, the subsequent circuits cannot supply power to achieve the purpose of under-voltage protection. The backup battery E1 and the main battery E2 are charged, and the resistor R4 and the resistor R5 are used to detect the voltage of the main battery E2. When the voltage of the battery E2 is detected to be insufficient, the voltage output to the transistor V2 will also decrease to the level of the PNP transistor. Turn-on threshold, at this time, the PNP diode V2 is turned on, and the backup battery E2 charges the main battery E after passing through the diode D1. It does not need to be as sophisticated as the main battery, and the indirect power supply through the main battery can reduce the design requirements of the backup battery.

Embodiment 2: On the basis of Embodiment 1, the designed π-type filter is composed of an inductor L1, a capacitor C1 and a capacitor C2, as shown in Figure 3. Its structure is simple, the production cost is low, and there are mature filters on the market. The purchase of the chip can filter out most of the clutter and increase the stability of the circuit.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention may be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments are to be considered in all respects as exemplary and not restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is therefore intended that the All changes within the meaning and range of the required equivalents are embraced within the present invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

In addition, it should be understood that although this specification is described in terms of embodiments, not each embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole , the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims (5)

1. an electric vehicle rear energy storage device, comprising a step-down rectifier module, a harmonic filter module, a protection switch, a backup battery, a one-way electronic switch and a voltage detection module, it is characterized in that, the step-down rectifier module of the The input end is connected to the commercial power supply, the output end of the step-down rectifier module is connected to the harmonic filter module, the output end of the harmonic filter module is connected to the protection switch, the protection switch is also connected to the backup battery and the main battery, and the main battery is also connected to the voltage detection module, the backup battery is also connected to the main battery through a one-way electronic switch, and the voltage detection module is also connected to the main battery. 2. The electric vehicle rear-mounted energy storage device according to claim 1, wherein the step-down rectifier module comprises a rectifier T and a transformer W, the harmonic filtering module adopts a π-type filter, and the protection switch comprises Resistor R1, resistor R2 and triode V1, one-way electronic switch includes triode V2 and diode D1, voltage detection module includes resistor R4 and resistor R5, the primary winding of transformer W is connected to 220V alternating current, the secondary winding of transformer W is connected to rectifier T, the rectifier The output port 2 of T is connected to the port 1 of the π-type filter, the port 2 of the π-type filter is connected to the output port 4 of the rectifier T, and the port 3 of the π-type filter is connected to the collector of the transistor V1 and the resistor R1, and the other side of the resistor R1 One end is connected to resistor R2 and the base of transistor V1, the emitter of transistor V1 is connected to switch S1 and resistor R3, the other end of resistor R3 is connected to switch S2, the other end of resistor R2 is connected to the negative electrode of backup battery E1, the negative electrode of main battery E2, Capacitor C3, resistor R5 and port 4 of the π-type filter, the other end of switch S1 is connected to the emitter of transistor V2 and the anode of backup battery E1, the collector of transistor V2 is connected to the anode of diode D1, and the cathode of diode D1 is connected to the main battery The anode of E2, the other end of capacitor C3, the other end of resistor R4 and switch S2, the other end of resistor R4 is connected to the other end of resistor R5 and the base of transistor V2. 3 . The electric vehicle rear energy storage device according to claim 2 , wherein the π-type filter is composed of an inductor L1 , a capacitor C1 and a capacitor C2 . 4 . 4 . The rear-mounted energy storage device of an electric vehicle according to claim 2 , wherein the diode D1 is a rectifier diode. 5 . 5 . The electric vehicle rear-mounted energy storage device according to claim 2 , wherein the transistor V1 is an NPN transistor, and the transistor V2 is a PNP transistor. 6 .

Images