CN216252208U

CN216252208U - Storage battery over-discharge protection device of household solar photovoltaic system

Info

Publication number: CN216252208U
Application number: CN202122330698.1U
Authority: CN
Inventors: 谢晗; 谢珍贵; 张瑞芬
Original assignee: Fujian College of Water Conservancy and Electric Power
Current assignee: Fujian College of Water Conservancy and Electric Power
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-04-08
Anticipated expiration: 2031-09-26

Abstract

The utility model provides a domestic solar photovoltaic system's battery overdischarge protection device, it relates to a battery protection device, and it contains control module, power module, touch-sensitive screen, LED display screen, voltage acquisition module, temperature acquisition module, current acquisition module and switch module connect on control module, touch-sensitive screen, LED display screen and control module be connected with power module. The current collection module collects the current of the storage battery during discharging, the temperature collection module collects the temperature rise of the storage battery during discharging, the current and the temperature rise are sent to the control module, the voltage condition of the storage battery collected by the voltage collection module is combined, and the logical operation of the control module is adopted to cut off the discharging loop of the storage battery through the switch module, so that the storage battery is protected.

Description

Storage battery over-discharge protection device of household solar photovoltaic system

Technical Field

The utility model relates to the technical field of storage batteries, in particular to a storage battery over-discharge protection device of a household solar photovoltaic system.

Background

The household solar photovoltaic system is widely applied to vast areas without electricity and electricity in China, and solves the most basic domestic electricity utilization problem of farmers and herdsmen in the areas. In general, a storage battery with a certain capacity is required to be configured in such a system, during the day, the storage battery stores electric energy obtained by converting solar energy through a solar panel, and at night or in rainy days, the storage battery supplies the electric energy to loads (such as lamps, televisions and the like) directly or through a proper power converter and a controller, so that the system is very convenient to use. However, in such systems currently on the market, the batteries are often permanently damaged by irreversible chemical reactions that occur due to improper setting of the overdischarge protection control voltage.

At present, the traditional over-discharge protection of the storage battery adopts the voltage of the storage battery as a judgment criterion for judging whether the storage battery is over-discharged or not, and although the problem of over-discharge of the storage battery is solved, the problems of low efficiency of the protection mode and poor judgment control precision still exist in the protection mode, and the market requirements cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects and shortcomings of the prior art, and provides a storage battery over-discharge protection device of a household solar photovoltaic system.

In order to achieve the purpose, the utility model adopts the following technical scheme: the utility model provides a domestic solar photovoltaic system's battery overdischarge protection device, it contains control module 1, power module 2, touch-sensitive screen 3, LED display screen 4, voltage acquisition module 5, temperature acquisition module 6, current acquisition module 7 and switch module 8 connect on control module 1, touch-sensitive screen 3, LED display screen 4 and control module 1 be connected with power module 2.

Further, the touch screen 3 is connected with the control module 1 through a serial port communication line.

Furthermore, the input end of the voltage acquisition module 5 and the input end of the temperature acquisition module 6 are connected with the output end of the power supply.

Further, the output end of the switch module 8 is connected to the input end of the load.

Furthermore, the temperature acquisition module 6 and the current acquisition module 7 are connected with the control module 1 through serial communication lines.

The working principle of the utility model is as follows:

the utility model converts solar energy into electric energy through a solar cell panel and then transmits the electric energy to a storage battery, the storage battery supplies power to a load through an over-discharge protection device, wherein the over-discharge protection device comprises a control module 1, a power module 2, a touch screen 3, an LED display screen 4, a voltage acquisition module 5, a temperature acquisition module 6, a current acquisition module 7 and a switch module 8, the power module 2 is used for taking voltage from the storage battery and converting the voltage into voltage used by each component of the device, the voltage acquisition module 5 carries out isolation amplification on terminal voltage of the storage battery and transmits the terminal voltage to the control module 1, the terminal voltage value of the storage battery is obtained after AD conversion, the current acquisition module 7 is respectively used for acquiring current values on a circuit in the process of discharging the storage battery to the load, the temperature acquisition module 6 is used for acquiring temperature rise generated in the discharging process of the storage battery, and the terminal voltage value is used as a switch channel for discharging the storage battery to the load through the switch module 8, the connection between the accumulator and the load is switched off and on under the control of the control module 1, during operation via the touch screen 3 for human-computer interaction, while the LED display screen 4 is used for displaying relevant operating, fault and warning indications.

The working process of the over-discharge protection of the storage battery comprises the steps that firstly, a control module 1 collects the terminal voltage of the storage battery through a voltage collection module 5, and then judges the SOC value of the storage battery, the control module 1 is set in a certain time, when the SOC value of the storage battery is smaller than 0.3, but the temperature rise of the storage battery collected through a temperature collection module 6 is within 5 ℃, the storage battery is indicated to normally discharge to a load, further, when the time enters the next range, the temperature rise of the storage battery collected through the temperature collection module 6 reaches 5 ℃, the storage battery is indicated to be in an over-discharge state, and at the moment, the control module 1 cuts off a loop to the load through a switch module 8, and the storage battery is protected.

After the technical scheme is adopted, the utility model has the beneficial effects that:

1. the current collection module collects the current of the storage battery during discharging, the temperature collection module collects the temperature rise of the storage battery during discharging, the current and the temperature rise are sent to the control module, the voltage condition of the storage battery collected by the voltage collection module is combined, and the three modules perform logical operation through the control module to judge that a discharging loop of the storage battery is cut off through the switch module when the storage battery is in an over-discharge state, so that the storage battery is protected;

2. the utility model carries out human-computer interaction through the touch screen and visually expresses the discharge state of the storage battery through the LED display screen, and has the characteristics of high intelligent degree and convenient use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic overall flow diagram of the present invention.

Fig. 2 is a system configuration diagram of the present invention.

Description of reference numerals: the LED display screen comprises a control module 1, a power module 2, a touch screen 3, an LED display screen 4, a voltage acquisition module 5, a temperature acquisition module 6, a current acquisition module 7 and a switch module 8.

Detailed Description

Referring to fig. 1 to 2, the technical solution adopted by the present embodiment is: it contains control module 1, power module 2, touch-sensitive screen 3, LED display screen 4, voltage acquisition module 5, temperature acquisition module 6, current acquisition module 7 and switch module 8 connect on control module 1, touch-sensitive screen 3, LED display screen 4 and control module 1 be connected with power module 2, control module 1 adopts the singlechip, touch-sensitive screen 3 adopts the siemens touch-sensitive screen.

The touch screen 3 is connected with the control module 1 through a serial port communication line, and a 485 serial port communication cable is adopted.

The input end of the voltage acquisition module 5 and the input end of the temperature acquisition module 6 are connected with the output end of the power supply.

And the output end of the switch module 8 is connected with the input end of the load.

The temperature acquisition module 6 and the current acquisition module 7 are connected with the control module 1 through serial communication lines, and the serial communication lines adopt 485 serial communication cables.

In the embodiment, solar energy is converted into electric energy by a solar panel and then is transmitted to a storage battery, the storage battery supplies power to a load by an over-discharge protection device, wherein the over-discharge protection device comprises a control module 1, a power module 2, a touch screen 3, an LED display screen 4, a voltage acquisition module 5, a temperature acquisition module 6, a current acquisition module 7 and a switch module 8, the power module 2 is used for acquiring voltage from the storage battery and converting the voltage into voltage for each component of the device, the voltage acquisition module 5 is used for isolating and amplifying the terminal voltage of the storage battery and transmitting the terminal voltage to the control module 1, the terminal voltage value of the storage battery is obtained after AD conversion, the current acquisition module 7 is respectively used for acquiring the current value on a circuit in the process of discharging the storage battery to the load, the temperature acquisition module 6 is used for acquiring the temperature rise generated in the discharging process of the storage battery, and is used as a switch channel for discharging the storage battery to the load by the switch module 8, the connection between the accumulator and the load is switched off and on under the control of the control module 1, during operation via the touch screen 3 for human-computer interaction, which is used to read and input relevant parameters to the control module 1, while the LED display 4 is used to display relevant operating, fault and warning indications.

The working flow of the over-discharge protection of the storage battery in this embodiment is that, firstly, the control module 1 collects the terminal voltage of the storage battery through the voltage collection module 5, and then judges the SOC value of the storage battery, the control module 1 is set in a certain time, when the SOC value of the storage battery is less than 0.3, but the temperature rise of the storage battery collected through the temperature collection module 6 is within 5 ℃, it indicates that the storage battery normally discharges to the load, further, when the time enters the next range, when the temperature rise of the storage battery collected through the temperature collection module 6 reaches 5 ℃, it indicates that the storage battery is in an over-discharge state, at this time, the control module 1 cuts off the loop to the load through the switch module 8, and then the storage battery is protected.

After adopting above-mentioned technical scheme, this embodiment beneficial effect does:

1. in the embodiment, the current collection module is used for collecting the current of the storage battery during discharging, the temperature collection module is used for collecting the temperature rise of the storage battery during discharging, the current and the temperature rise are sent to the control module, the voltage condition of the storage battery collected by the voltage collection module is combined, and the three modules perform logical operation through the control module to judge that a discharging loop of the storage battery is cut off through the switch module when the storage battery is in an over-discharge state, so that the storage battery is protected;

2. the embodiment carries out human-computer interaction through the touch screen, and can visually express the discharge state of the storage battery through the LED display screen, and the LED storage battery has the characteristics of high intelligent degree and convenience in use.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The utility model provides a domestic solar photovoltaic system's battery overdischarge protection device which characterized in that: the LED display screen comprises a control module (1), a power module (2), a touch screen (3), an LED display screen (4), a voltage acquisition module (5), a temperature acquisition module (6), a current acquisition module (7) and a switch module (8), wherein the touch screen (3), the LED display screen (4), the voltage acquisition module (5), the temperature acquisition module (6), the current acquisition module (7) and the switch module (8) are connected to the control module (1), and the touch screen (3), the LED display screen (4) and the control module (1) are connected with the power module (2).

2. The storage battery over-discharge protection device of the household solar photovoltaic system according to claim 1, characterized in that: the touch screen (3) is connected with the control module (1) through a serial port communication line.

3. The storage battery over-discharge protection device of the household solar photovoltaic system according to claim 1, characterized in that: and the output end of the switch module (8) is connected with the input end of the load.

4. The storage battery over-discharge protection device of the household solar photovoltaic system according to claim 1, characterized in that: the temperature acquisition module (6) and the current acquisition module (7) are connected with the control module (1) through serial port communication lines.