CN204761016U - A protection circuit for a new energy vehicle power battery - Google Patents

Abstract

The structure of the protection circuit comprises a first switch device, an anti-reverse-charging diode and a voltage detection and control circuit, wherein the detection end of the voltage detection and control circuit is connected to the two ends of a power battery, the control end of the voltage detection and control circuit is connected to the controlled end of the first switch device, the two ends of the first switch device are connected to the two ends of the power battery, a loop between the first switch device and the power battery is connected with the anti-reverse-charging diode, the voltage at the two ends of the power battery is greater than the reference voltage of the voltage detection and control circuit, the voltage detection and control circuit controls the first switch device to be conducted, the voltage of an external electric energy source is greater than the voltage at the two ends of the power battery, the anti-reverse-charging diode is conducted, and the voltage of the external electric energy source is less than the voltage at the two ends of the power battery, and the anti-reverse-.

Description

A protection circuit for a new energy vehicle power battery

technical field

The utility model relates to the technical field of battery protection, in particular to a protection circuit for a power battery of a new energy vehicle.

Background technique

New energy vehicles include pure electric vehicles, extended-range electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles and other new energy vehicles, among which pure electric vehicles, extended-range electric vehicles and fuel cell electric vehicles all need to use Batteries used to provide power.

At present, there is still a lot of room for improvement in my country's lithium-ion power batteries in the four key aspects that determine performance, such as materials, formulas, production equipment and process technology. It is understood that many batteries now lack protection circuits, which causes the battery to be overcharged or overdischarged during use, which affects the life of the battery and even brings safety hazards.

Contents of the invention

The purpose of the utility model is to avoid the deficiencies in the prior art and provide a new energy vehicle power battery protection circuit, the new energy vehicle power battery protection circuit can be used by software engineers in the voltage detection and control circuit Write software to improve battery life and reduce safety hazards.

The purpose of this utility model is achieved through the following technical solutions:

A protection circuit for a power battery of a new energy vehicle is provided. The power battery is charged by an external electric energy source and supplies power to a load. A diode and a voltage detection and control circuit, the detection terminal of the voltage detection and control circuit is connected to both ends of the power battery, and the control terminal of the voltage detection and control circuit is connected to the controlled terminal of the first switching device , the two ends of the first switching device are connected to the two ends of the power battery, the loop between the first switching device and the power battery is connected with the anti-reverse charging diode, and the voltage at both ends of the power battery is greater than If the reference voltage of the voltage detection and control circuit is used, the voltage detection and control circuit controls the first switching device to be turned on; When the voltage of the external electric energy is greater than the voltage at both ends of the power battery, the anti-reverse charge diode is turned on, and when the voltage of the external electric energy is lower than the voltage at both ends of the power battery, the anti-reverse charge diode is cut off.

The protection circuit of the power battery of the new energy vehicle further includes a second switching device connected in the circuit between the power battery and the load, and the second switching device is controlled by the voltage detection and control circuit.

The protection circuit of the new energy vehicle power battery also includes an anti-reverse connection diode and a fuse. The anti-reverse connection diode and the fuse are connected in series to form a circuit with the power battery. The diode conducts and the fuse blows.

The external electric energy source is a solar panel.

The first switching device is a circuit including a triode.

The second switching device is a circuit including a triode.

Beneficial effects of the utility model: a protection circuit of a power battery of a new energy vehicle according to the utility model can be used by software engineers to set the reference voltage in the voltage detection and control circuit, and then use the voltage detection and control circuit to protect the power battery. The voltage is detected. When the voltage at both ends of the power battery is greater than the reference voltage of the voltage detection and control circuit, the voltage detection and control circuit controls the first switching device to be turned on. The bypass of the switching device is discharged, and the power battery is no longer charged, so as to ensure that the power battery will not be overcharged and protect the power battery from overcharging. When the voltage at both ends of the power battery is lower than the voltage detection and control circuit The reference voltage is the voltage detection and control circuit to control the first switching device to turn off, and continue to charge the power battery. When the voltage of the external electric energy source is greater than the voltage of the power battery, the anti-reverse charge diode is turned on, otherwise it is cut off, so as to ensure night or rainy There will be no reverse charging of the power battery to the external electric energy during the day, which plays the role of anti-reverse charging protection.

Description of drawings

Utilize accompanying drawing to further illustrate the utility model, but the embodiment in the accompanying drawing does not constitute any restriction to the present utility model, for those of ordinary skill in the art, under the premise of not paying creative work, also can obtain according to following accompanying drawing Additional drawings.

Fig. 1 is a schematic circuit diagram of a protection circuit of a power battery of a new energy vehicle according to the present invention.

Fig. 2 is a schematic circuit diagram of a protection circuit for a power battery of a new energy vehicle in this embodiment.

Detailed ways

The utility model is further described in conjunction with the following examples.

A protection circuit for a power battery of a new energy vehicle in this embodiment, as shown in Figure 1, the power battery is charged by an external electric energy source, and supplies power to a load, and includes a first switching device, which is used to prevent the power battery from charging the external electric energy source. The charging anti-reverse charge diode and the voltage detection and control circuit, the detection terminal of the voltage detection and control circuit is connected to the two ends of the power battery, and the control terminal of the voltage detection and control circuit is connected to the first switch The controlled end of the device, the two ends of the first switching device are connected to the two ends of the power battery, the loop between the first switching device and the power battery is connected with the anti-reverse charging diode, and the power When the voltage at both ends of the battery is greater than the reference voltage of the voltage detection and control circuit, the voltage detection and control circuit controls the first switching device to be turned on; When the switching device is turned off, the anti-reverse charge diode is turned on when the voltage of the external electric energy source is greater than the voltage at both ends of the power battery, and the anti-reverse charge diode is turned off when the voltage of the external electric energy source is lower than the voltage at both ends of the power battery.

The protection circuit of a new energy vehicle power battery in this embodiment can be used by software engineers to detect the voltage of the power battery by using the voltage detection and control circuit after setting the reference voltage in the voltage detection and control circuit. If the voltage at both ends is greater than the reference voltage of the voltage detection and control circuit, the voltage detection and control circuit controls the first switching device to be turned on, and at the same time, the anti-reverse charge diode is cut off, and the electric energy of the external power source is directly discharged through the bypass of the first switching device. discharge, no longer charge the power battery, so as to ensure that the power battery will not be overcharged, and protect the power battery from overcharging. When the voltage at both ends of the power battery is lower than the reference voltage of the voltage detection and control circuit, the voltage detection and control The circuit controls the first switching device to be turned off, and continues to charge the power battery. When the voltage of the external electric energy source is greater than the voltage of the power battery, the anti-reverse charging diode is turned on, otherwise it is turned off, so as to ensure that the power battery does not turn on at night or in rainy days. The external electric energy is reversely charged, which plays the role of anti-reverse charging protection.

This embodiment also includes a second switching device, the second switching device is connected in the loop between the power battery and the load, the second switching device is controlled by the voltage detection and control circuit, and the second switching device is Power battery discharge switch, when the voltage detection and control circuit detects that the load current is greater than the rated current and overload or load short circuit occurs, it controls the second switching device to turn off, which plays the role of output overload protection and output short circuit protection. At the same time, when When the voltage detection and control circuit detects that the voltage of the power battery is lower than the over-discharge voltage, it also controls the second switching device to be turned off to perform over-discharge protection.

The protection circuit of the new energy vehicle power battery also includes an anti-reverse connection diode and a fuse. The anti-reverse connection diode and the fuse are connected in series to form a circuit with the power battery. The diode is turned on and the fuse is blown. When the polarity of the power battery is reversed, the anti-reverse diode is turned on, so that the power battery is short-circuited and discharged through the anti-reverse diode, and a large current is generated to quickly blow the fuse F to prevent The role of power battery reverse polarity protection.

In summary, the protection circuit for the power battery of a new energy vehicle in this embodiment can realize overcharge protection of the power battery, over-discharge protection of the power battery, and anti-reverse connection protection of the power battery.

Wherein, as shown in FIG. 2 , the external electric energy source is a solar panel, of course, it may also be other types of external electric energy sources.

The first switching device is a circuit including a triode.

The second switching device is a circuit including a triode, and the triode is simple and easy to realize and has low cost.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (6)

1. the protective circuit of a new-energy automobile power battery, electrokinetic cell is charged by external electric energy source, and be load supplying, it is characterized in that: comprise the first switching device, for preventing the electrokinetic cell externally anti-reverse charging diode of electric energy charging and voltage detecting and control circuit, the test side of described voltage detecting and control circuit is connected to the two ends of described electrokinetic cell, the control end of described voltage detecting and control circuit is connected to the controlled end of described first switching device, two ends of described first switching device are connected to the two ends of described electrokinetic cell, loop between described first switching device and described electrokinetic cell is connected to described anti-reverse charging diode.

2. the protective circuit of a kind of new-energy automobile power battery as claimed in claim 1; it is characterized in that: also comprise second switch device; described second switch device is connected in the loop between electrokinetic cell and load, and described second switch device is controlled by described voltage detecting and control circuit.

3. the protective circuit of a kind of new-energy automobile power battery as claimed in claim 1 or 2; it is characterized in that: the protective circuit of new-energy automobile power battery also comprises anti-reverse diode and fuse; a loop is connected to become with described electrokinetic cell after described anti-reverse diode and described fuse serial connection; electrokinetic cell reversal connection is described anti-reverse diode current flow then, blowout.

4. the protective circuit of a kind of new-energy automobile power battery as claimed in claim 1, is characterized in that: described external electric energy source is solar panel.

5. the protective circuit of a kind of new-energy automobile power battery as claimed in claim 1, is characterized in that: described first switching device is the circuit comprising triode.

6. the protective circuit of a kind of new-energy automobile power battery as claimed in claim 2, is characterized in that: described second switch device is the circuit comprising triode.