Intelligent photovoltaic lithium battery energy storage management system

Abstract

The invention discloses an intelligent photovoltaic lithium battery energy storage management system. The system comprises an STM32 minimum system board, a voltage acquisition module, a current acquisition module, a temperature acquisition module, an OLED display, a lithium battery, a charging module and a photovoltaic panel. The STM32 minimum system board is respectively connected with the voltage acquisition module, the current acquisition module, the temperature acquisition module, the charging module and the OLED display, the voltage acquisition module, the current acquisition module and the temperature acquisition module are all connected with the lithium battery, the lithium battery is connected with the charging module, and the charging module is connected with the OLED display. And the charging module is connected with the photovoltaic panel. According to the system provided by the invention, energy storage for photovoltaic power generation can be realized, and meanwhile, safety management on the lithium battery is realized.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic energy storage, and in particular to an intelligent photovoltaic lithium battery energy storage management system. Background Art

[0002] With the rapid development of renewable energy, photovoltaic power generation has received widespread attention as an important clean energy source. However, the energy utilization efficiency of photovoltaic power generation is not high. The reasons are: 1. Photovoltaic power generation is intermittent and unstable. 2. Most of the existing energy storage management systems lack deep integration with photovoltaic power generation systems and cannot monitor and manage the status of batteries in real time, resulting in low efficiency of energy storage and release. In addition, the existing systems are insufficient in terms of battery safety management, and often cannot effectively warn of safety hazards such as overcharging and high temperature, increasing the risk of equipment damage and safety accidents. At the same time, the existing technology also has large errors in estimating the battery storage capacity, lacks an intuitive display interface, and it is difficult for users to grasp the actual status of the battery. Therefore, there is an urgent need for an intelligent photovoltaic lithium battery energy storage management system to solve the above problems. Summary of the invention

[0003] In view of this, the object of the present invention is to provide an intelligent photovoltaic lithium battery energy storage management system, characterized in that it includes:

[0004] STM32 minimum system board, voltage acquisition module, current acquisition module, temperature acquisition module, OLED display, lithium battery, charging module, photovoltaic panel;

[0005] The STM32 minimum system board is respectively connected to the voltage acquisition module, the current acquisition module, the temperature acquisition module, the charging module, and the OLED display, the voltage acquisition module, the current acquisition module, and the temperature acquisition module are all connected to the lithium battery, the lithium battery is connected to the charging module, and the charging module is connected to the photovoltaic panel;

[0006] The voltage acquisition module, the current acquisition module, the interface module, and the charging module are all arranged on a circuit board.

[0007] Preferably, the voltage acquisition module includes: two operational amplifiers and a photoelectric coupling isolation chip; the current acquisition module includes: a Hall sensor; the temperature acquisition module includes: a temperature sensor; and the charging module includes: two electromagnetic relays.

[0008] Preferably, it also includes:

[0009] The interface module includes: STM32 interface, temperature acquisition interface, lithium battery interface, photovoltaic panel interface, power supply battery interface, OLED interface;

[0010] The STM32 minimum system board, the temperature acquisition module, the lithium battery, the photovoltaic panel, and the OLED display are externally connected to the circuit board through the STM32 interface, the temperature acquisition interface, the lithium battery interface, the photovoltaic panel interface, and the OLED interface, respectively.

[0011] Preferably, it also includes:

[0012] A circuit board power supply battery, the circuit board power supply battery is respectively connected to the voltage acquisition module, the current acquisition module, and the charging module through the power supply battery interface; a power supply indication module, the power supply indication module is arranged on the circuit board.

[0013] Preferably, a voltage conversion power supply unit is provided in the circuit board power supply battery, and the voltage conversion power supply unit includes: a 12V to 6V power supply unit, a 12V to 5V power supply unit, and a 5V to 3.3V power supply unit.

[0014] The beneficial effects of the present invention are as follows: the system can realize energy storage for photovoltaic power generation, while ensuring the safe management of lithium batteries, and estimating and displaying the amount of electricity stored in lithium batteries.

[0015] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0019] Figure 2 A circuit schematic diagram of an STM32 minimum system board of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0020] Figure 3 A circuit schematic diagram of a voltage acquisition module of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0021] Figure 4 A circuit schematic diagram of a current acquisition module of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of the sensitivity of a Hall sensor of an intelligent photovoltaic lithium battery energy storage management system according to an embodiment of the present invention changing with temperature;

[0023] Figure 6 A circuit schematic diagram of a charging module of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0024] Figure 7 A schematic diagram of the positions of the interfaces on the circuit board in an interface module of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0025] Figure 8 A circuit schematic diagram of a temperature acquisition interface of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0026] Fig. 9 A circuit schematic diagram of an OLED interface of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0027] Fig.10 A circuit schematic diagram of a lithium battery interface of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0028] Fig.11 A circuit schematic diagram of a power supply battery interface of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0029] Fig.12 A circuit schematic diagram of a power indicator module of an intelligent photovoltaic lithium battery energy storage management system provided by an embodiment of the present invention;

[0030] Fig.13 A schematic diagram of a 12V to 6V power supply unit of an intelligent photovoltaic lithium battery energy storage management system provided in an embodiment of the present invention;

[0031] Fig.14 A circuit schematic diagram of a 12V to 5V power supply unit of an intelligent photovoltaic lithium battery energy storage management system provided in an embodiment of the present invention;

[0032] Fig.15A circuit schematic diagram of a 5V to 3.3V power supply unit of an intelligent photovoltaic lithium battery energy storage management system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] To facilitate understanding of this embodiment, Figure 1 An intelligent photovoltaic lithium battery energy storage management system disclosed in an embodiment of the present invention is introduced in detail.

[0035] Embodiment 1: This embodiment provides an intelligent photovoltaic lithium battery energy storage management system, including:

[0036] STM32 minimum system board, voltage acquisition module, current acquisition module, temperature acquisition module, OLED display, lithium battery, charging module, photovoltaic panel;

[0037] The STM32 minimum system board is connected to the voltage acquisition module, current acquisition module, temperature acquisition module, charging module, and OLED display respectively. The voltage acquisition module, current acquisition module, and temperature acquisition module are all connected to the lithium battery, the lithium battery is connected to the charging module, and the charging module is connected to the photovoltaic panel;

[0038] The voltage acquisition module, the current acquisition module, the interface module and the charging module are all arranged on the circuit board.

[0039] In this embodiment, if Figure 2 As shown, the STM32 minimum system board is an STM32 main control chip U1 of model STM32F103C8T6, which is provided with an 8MHz external crystal oscillator, a USB external power supply port, and a first pin for program downloading led out through a female header, and the names of the first pin include: GND, SWLCK, SWDIO, 3V3; wherein, the STM32 minimum system board is used to include: obtaining current information and voltage information through a voltage acquisition module and a current acquisition module to calculate the real-time power of the lithium battery; and controlling the on and off of the charging module.

[0040] The size of the OLED display is 0.96 inches, and the model of the internal driver chip of the OLED display screen is SSD1306; the OLED display also has 4 second pins, the names of the second pins include: VCC power positive (3.3V~5V), GND-power negative, SCL-IIC clock line, SDA-IIC data line; among them, the OLED display is used to display the real-time power of the lithium battery calculated by the STM32 minimum system board.

[0041] The lithium battery is a 6V lithium battery with an SM male connector.

[0042] Preferably, the voltage acquisition module includes: two operational amplifiers and a photoelectric coupling isolation chip; the current acquisition module includes: a Hall sensor; the temperature acquisition module includes: a temperature sensor; and the charging module includes: two electromagnetic relays.

[0043] In this embodiment, in the voltage acquisition module, the operational amplifier is an LM358 chip, and the photoelectric coupling isolation chip is a TLP521-2 chip.

[0044] like Figure 3 As shown in the figure, in the voltage acquisition module, PA0 is connected to the PA0 pin of the STM32 main control chip, IN + with IN - They are connected to the positive and negative electrodes of the lithium battery respectively. The voltage across the lithium battery is divided by resistors R61 and R62 and then input into operational amplifiers U6.1 and U6.2.

[0045] Among them, the operational amplifier U6.1 and the optical coupler isolation chip U5 together form an improved optical coupler isolation circuit. Through the virtual short principle of the operational amplifier U6.2, the voltages of pins 2 and 3 of the operational amplifier U6.1 are equal. Since the parameters of the two pairs of optical couplers in the optical coupler isolation chip U5 are highly consistent, the output currents of pins 5 and 7 of the optical coupler isolation chip U5 are consistent, making the output voltage V out And lithium battery V in (V in =IN + -IN - ) satisfies the following expression:

[0046]

[0047] In the formula, the resistance values ​​of R61, R62, R65, and R66 are the same, so the following expression is obtained by simplification, namely:

[0048]

[0049] Based on this, the voltage acquisition module can realize the voltage information acquisition of the lithium battery. It should also be noted that the benefit of using the optocoupler isolation design is that, under normal circumstances, if only one pair of optocouplers is set, it will be sensitive to temperature. The optocoupler isolation chip TLP521-2 in this embodiment encapsulates two pairs of optocouplers, which effectively reduces the impact of temperature on the device by ensuring the current consistency of the two light-emitting diodes.

[0050] like Figure 4 As shown, in the current acquisition module, the Hall sensor is the ACS712 chip U10, and the ACS712 chip U10 obtains the input terminal IN of the measured current by short-circuiting pins 1 and 2 together. + By shorting pins 3 and 4 together, the output terminal IN of the measured current is obtained. - , IN + with IN - They are connected to the positive and negative electrodes of the lithium battery respectively; VCC is grounded through the filter capacitor C33. As another example, VCC can also be grounded through the filter capacitor C33 and the filter capacitor C31; in addition, PA5 is connected to the PA5 pin of the STM32 main control chip U1;

[0051] Among them, the analog output signal of the ACS712 chip U10 is completely proportional to the AC and DC currents being measured.

[0052] It should also be noted that the specific model of the ACS712 chip used in this system is ACS712ELC TR-05B-T-JSM, and its parameters are shown in Table 1:

[0053] Table 1

[0054]

[0055] In Table 1, the sensitivity is the change value of the output of pin 6 OUT of the ACS712 chip U10 when the measured AC and DC current changes by 1A. Since the ACS712 chip U10 can collect current, the current value is not fixed, so there is no typical value for the current range.

[0056] The line graph of sensitivity changing with temperature is as follows Figure 5 As shown. Combined Figure 5 It can be seen that when the temperature is 25°C, the sensitivity is 185mV / A, which is a typical value. It can be seen that when the power supply of the Hall element is +5V, the input current I in When the output voltage of PA5 is 0A, V PA5 is 0V, as I in The change of V PA5 The corresponding changes, I in With V PA5Satisfying the proportional relationship, the output voltage is divided by the sensitivity 185mV / A to obtain the input current value, thereby achieving the purpose of collecting lithium battery current. in With V PA5 The expressions that satisfy the proportional relationship are as follows:

[0057]

[0058] In the temperature acquisition module, the temperature sensor is a DS18B20 temperature sensor, and the DS18B20 temperature sensor obtains the real-time temperature of the 6V lithium battery by directly contacting the 6V lithium battery.

[0059] like Figure 6 As shown, in the charging module, the charging module is connected to the photovoltaic panel through the charging interface; IN + , IN - They are connected to the positive and negative poles of the 6V lithium battery respectively, and PB7 is connected to the PA7 pin of the STM32 main control chip U1; two electromagnetic relays D3 and D4 are provided in the charging module. When PB7 is at a high level, the transistor is turned on, and the electromagnetic relays D3 and D4 are internally connected to the normally open contact 2, and pin 2 is connected to pin 5; when PB7 is at a low level, the electromagnetic relays D3 and D4 are internally connected to the normally closed contact 3, and pin 3 is connected to pin 5;

[0060] Among them, the functions of the charging module include: using electromagnetic relays to control the on and off of the charging circuit between the photovoltaic panel and the lithium battery through the high and low level outputs of the STM32 minimum system board, thereby realizing the function of preventing overcharging when the lithium battery has high voltage, and the automatic charging disconnection function when high temperature occurs, so as to achieve the purpose of safe management of lithium batteries.

[0061] Preferably, the intelligent photovoltaic lithium battery energy storage management system provided in this embodiment also includes:

[0062] Interface module, the interface module is equipped with: STM32 interface, temperature acquisition interface, lithium battery interface, photovoltaic panel interface, power supply battery interface, OLED interface;

[0063] The STM32 minimum system board, temperature acquisition module, lithium battery, photovoltaic panel, and OLED display are connected to the circuit board through the STM32 interface, temperature acquisition interface, lithium battery interface, photovoltaic panel interface, and OLED interface respectively.

[0064] In this embodiment, the positions of the interfaces in the interface module on the circuit board are as follows: Figure 7 shown.

[0065] Furthermore, the system further comprises:

[0066] The circuit board power supply battery is connected to the voltage acquisition module, the current acquisition module and the charging module through the power supply battery interface respectively; the power supply indication module is arranged on the circuit board.

[0067] Furthermore, a voltage conversion power supply unit is provided in the circuit board power supply battery, and the voltage conversion power supply unit includes: a 12V to 6V power supply unit, a 12V to 5V power supply unit, and a 5V to 3.3V power supply unit.

[0068] In this embodiment, combined with Figure 1 and Figure 8 In the temperature acquisition interface, PB1 is connected to the PB1 pin of the STM32 main control chip U1, and GND is grounded.

[0069] Combination Figure 1 and Fig. 9 In the OLED interface, PB9 and PB8 are connected to the PB9 pin and PB8 pin of the STM32 main control chip U1 respectively, VCC is connected to the 5V to 3.3V power supply unit, and GND is grounded.

[0070] Combination Figure 3 , Figure 4 , Figure 6 and Fig.10 , IN of lithium battery interface + with IN - Respectively with the voltage acquisition module, current acquisition module and charging module IN + with IN - Connected.

[0071] like Fig.11 As shown, the power supply battery interface is provided with a female connector DC1 of model DC5.5*2.1 and a button switch U8; wherein the power supply battery interface is used to control the on and off of the power supply battery of the circuit board.

[0072] Furthermore, the circuit board power supply battery is a 12V circuit board power supply battery, which is provided with a DC5.5-2.1 male connector for connection with the circuit board; wherein the circuit board power supply battery is used to power the voltage acquisition module, the current acquisition module, and the charging module.

[0073] Combination Fig.12 In the power indication module, when the power supply battery interface is connected to the 12V circuit board power supply battery, LED4 lights up; when the lithium battery interface is connected to the lithium battery, LED3 lights up.

[0074] Furthermore, combined with Figure 13 to Figure 15The 12V to 6V power supply unit is used to convert the 12V voltage into a 6V voltage, and use the 6V voltage to power the pins 6 and 8 of the optocoupler isolation chip of the voltage acquisition module; the 12V to 5V power supply unit is used to convert the 12V power supply into a 5V voltage, and use the 5V voltage to power the Hall sensor of the current acquisition module; the 5V to 3.3V power supply unit is used to convert the 5V voltage into a 3.3V voltage, and use the 3.3V voltage to power the VCC pin of the Hall sensor of the current acquisition module.

[0075] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An intelligent photovoltaic lithium battery energy storage management system, characterized in that: include: STM32 minimum system board, voltage acquisition module, current acquisition module, temperature acquisition module, OLED display, lithium battery, charging module, photovoltaic panel; The STM32 minimum system board is respectively connected to the voltage acquisition module, the current acquisition module, the temperature acquisition module, the charging module, and the OLED display, the voltage acquisition module, the current acquisition module, and the temperature acquisition module are all connected to the lithium battery, the lithium battery is connected to the charging module, and the charging module is connected to the photovoltaic panel; The voltage acquisition module, the current acquisition module, the interface module, and the charging module are all arranged on a circuit board.

2. The intelligent photovoltaic lithium battery energy storage management system according to claim 1, characterized in that: The voltage acquisition module includes: two operational amplifiers and a photoelectric coupling isolation chip; the current acquisition module includes: a Hall sensor; the temperature acquisition module includes: a temperature sensor; the charging module includes: two electromagnetic relays.

3. The intelligent photovoltaic lithium battery energy storage management system according to claim 1, characterized in that: Also includes: The interface module includes: STM32 interface, temperature acquisition interface, lithium battery interface, photovoltaic panel interface, power supply battery interface, OLED interface; The STM32 minimum system board, the temperature acquisition module, the lithium battery, the photovoltaic panel, and the OLED display are externally connected to the circuit board through the STM32 interface, the temperature acquisition interface, the lithium battery interface, the photovoltaic panel interface, and the OLED interface, respectively.

4. An intelligent photovoltaic lithium battery energy storage management system according to claim 1 or 3, characterized in that: Also includes: A circuit board power supply battery, wherein the circuit board power supply battery is respectively connected to the voltage acquisition module, the current acquisition module, and the charging module through the power supply battery interface; A power indication module is arranged on the circuit board.

5. The intelligent photovoltaic lithium battery energy storage management system according to claim 4, characterized in that: The circuit board power supply battery is provided with a voltage conversion power supply unit, and the voltage conversion power supply unit includes: a 12V to 6V power supply unit, a 12V to 5V power supply unit, and a 5V to 3.3V power supply unit.

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