Photovoltaic power generation cell charging method, device and computer equipment

Abstract

The application relates to a battery charging method, device and computer equipment in photovoltaic power generation. If the ambient temperature value of the battery is less than a first low-temperature threshold, the battery is not allowed to be charged; if the ambient temperature value of the battery is greater than or equal to the first low-temperature threshold, the battery is charged with a micro-current; when the ambient temperature value of the battery is greater than the first low-temperature threshold and less than a second low-temperature threshold, the battery is kept being charged with the micro-current; when the ambient temperature value of the battery is less than the second low-temperature threshold, if the charging current value of the battery is less than a micro-current threshold, only the battery is charged and the battery is not allowed to be heated; if the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters a heating mode and is charged. The application is suitable for a charging strategy of a lithium battery under the conditions of low temperature and limited charging energy, the battery is protected, and the battery energy is prevented from being consumed too fast.

Description

Technical Field

[0001] This application relates to the field of battery charging technology, and in particular to a battery charging method, apparatus, computer equipment, and storage medium in photovoltaic power generation. Background Technology

[0002] With the continuous development of smart grid technology, the monitoring methods for high-voltage transmission lines are gradually transitioning from image-based to video-based methods, and from front-end transmission and back-end AI analysis to direct front-end AI analysis. This leads to increasingly higher power supply demands. Photovoltaic power supply, as a convenient and relatively abundant energy source, is the most widely used method in the field of high-voltage transmission line monitoring. Monitoring devices, whose size and weight are limited by the corresponding regulations for high-voltage transmission lines, generally use high-energy-density lithium batteries. Low-temperature charging can lead to increased self-discharge rate, rapid decline in lifespan, and even internal short circuits in lithium batteries. Simultaneously, low-temperature charging consumes a considerable amount of energy. The energy obtained through photovoltaic charging faces challenges in controlling heating conditions and maximizing charging efficiency, thus requiring strict temperature-related control of heating. However, currently, the battery heating process involves both photovoltaic energy and battery energy working together. After heating is complete, the energy added cannot even compensate for the energy consumed by the battery during the heating process, resulting in excessively rapid battery energy depletion. Summary of the Invention

[0003] Therefore, it is necessary to address the aforementioned technical problems by providing a battery charging method, apparatus, computer equipment, and storage medium for photovoltaic power generation, including a charging and heating scheme based on battery characteristics, suitable for lithium batteries under low-temperature and limited charging energy conditions. This application can solve the technical problem that in current battery heating processes, both photovoltaic energy and the battery are heated together, and the energy added after heating is complete is insufficient to compensate for the energy consumed by the battery during the heating process, leading to excessively rapid battery energy depletion.

[0004] On the one hand, a method for charging a battery in photovoltaic power generation is provided, the method comprising:

[0005] Real-time monitoring of the ambient temperature of the batteries in photovoltaic power generation equipment;

[0006] The system determines whether the ambient temperature of the battery is below a first low temperature threshold. If the ambient temperature is below the first low temperature threshold, charging the battery is not allowed. If the ambient temperature is above or equal to the first low temperature threshold, the photovoltaic power generation equipment charges the battery with a microcurrent.

[0007] When the ambient temperature of the battery is greater than the first low temperature threshold, the difference between the ambient temperature of the battery and the second low temperature threshold is determined, and the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, the battery is continuously charged with a microcurrent.

[0008] When the ambient temperature of the battery is lower than the second low temperature threshold, the charging current of the battery is monitored in real time.

[0009] The charging current value of the battery is compared with the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, the battery is charged but not allowed to be heated. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged.

[0010] In one embodiment, after the battery enters the heating mode and charges, the method further includes:

[0011] Real-time monitoring of battery temperature;

[0012] The temperature value of the battery is compared with the normal operating temperature threshold, wherein the normal operating temperature threshold is greater than the second low temperature threshold.

[0013] If the temperature of the battery is lower than the normal operating temperature threshold, the battery will continue to be heated.

[0014] When the temperature of the battery is greater than or equal to the normal operating temperature threshold, heating of the battery is stopped and the battery enters normal charging mode.

[0015] In one embodiment, the battery in the photovoltaic power generation includes a lithium battery; the first low temperature threshold is -20°C; the second low temperature threshold is 0°C; the microcurrent threshold is 0.05°C; and the normal operating temperature threshold is 10°C.

[0016] On the other hand, a photovoltaic power generation circuit is provided for implementing the battery charging method in photovoltaic power generation described above, comprising:

[0017] The positive terminal is equipped with a charging terminal and a discharging terminal;

[0018] The negative terminal trace is configured to correspond with the positive terminal trace and grounded;

[0019] The battery has a positive terminal and a negative terminal; the positive terminal of the battery is connected to the discharge terminal, and the negative terminal of the battery is connected to the negative terminal trace;

[0020] The first charging PMOS transistor has its drain connected to the charging terminal;

[0021] The second charging PMOS transistor has its drain connected to the discharge terminal and its source connected to the first charging PMOS transistor.

[0022] A heating element, one end of which is connected to the charging terminal;

[0023] A heated NMOS transistor is connected to the other end of the heating element, with its drain connected to the negative electrode trace; and

[0024] The charging control circuit receives a charging enable signal and is connected to the gate of the first charging PMOS transistor, the gate of the second charging PMOS transistor, and the gate of the heating NMOS transistor.

[0025] In one embodiment, the photovoltaic power generation circuit further includes:

[0026] Photovoltaic power generation equipment, connected to the charging terminal of the positive electrode wiring and the negative electrode wiring; and

[0027] The load is connected to the discharge terminal of the positive electrode trace and the negative electrode trace.

[0028] In one embodiment, when the charging current of the battery is less than a micro-current threshold and the ambient temperature of the battery is greater than a first low temperature threshold, it is in a micro-current charging state; the charging control circuit controls the first charging PMOS transistor and the second charging PMOS transistor to be turned on, and the charging control circuit controls the heating NMOS transistor to be turned off, so as to maintain micro-current charging of the battery. The current flows to the battery through the first charging PMOS transistor and the second charging PMOS transistor, and the battery continuously supplies power to the load;

[0029] When the charging current of the battery is greater than the micro-current threshold and the temperature of the battery is greater than or equal to the normal operating temperature threshold, it is in the rated charging state and provides a normal operating temperature threshold temperature hysteresis; the charging control circuit controls the first charging PMOS transistor and the second charging PMOS transistor to be turned on, and the charging control circuit controls the heating NMOS transistor to be turned off, so as to charge the battery. The current flows to the battery through the first charging PMOS transistor and the second charging PMOS transistor, and the battery continuously supplies power to the load;

[0030] When the charging current of the battery is greater than the micro-current threshold and the ambient temperature of the battery is less than the second low temperature threshold, it is in a heating state; the charging control circuit controls the first charging PMOS transistor and the second charging PMOS transistor to disconnect, and the charging control circuit controls the heating NMOS transistor to turn on, so that the battery continuously supplies power to the load.

[0031] In one embodiment, the charging control circuit includes:

[0032] The first control chip has OUTA pin, OUTB pin, -InA pin, +InA pin, -InB pin, +InB pin, -Vs pin, and +Vs pin; wherein the -Vs pin is grounded; the +Vs pin is connected to a first capacitor and then grounded, and the power supply voltage network is connected to the +Vs pin through a first resistor; the OUTA pin is connected to the +InA pin through a first diode and a second resistor in series; a first reference voltage is connected to the +InA pin through a third resistor; a second reference voltage is connected to the -InB pin through a fourth resistor; the -InB pin is connected to the OUTB pin through a fifth resistor; the power supply voltage network is grounded through a sixth resistor, a thermistor, and a seventh resistor connected in series; the thermistor has a thermistor positive terminal, a first thermistor negative terminal, and a second thermistor negative terminal; the thermistor positive terminal is connected to both the sixth resistor and the -InA pin, and the first thermistor negative terminal and the second thermistor negative terminal are both connected to the seventh resistor;

[0033] The second control chip has a first positive pin, a first positive pin, and a negative pin. The first positive pin of the second control chip is connected to the OUTB pin, and the first positive pin of the second control chip is connected to the OUTA pin. The negative pin of the second control chip is connected to the base of the transistor through an eighth resistor. A ninth resistor is connected between the base and emitter of the transistor. The emitter of the transistor is grounded. The collector of the transistor is connected to the control signal output terminal. The power supply voltage network is connected to the control signal output terminal through a pull-up resistor. The second control chip outputs a control signal generated through the transistor and the pull-up resistor to control the first charging PMOS transistor, the second charging PMOS transistor, and the heating NMOS transistor.

[0034] In one embodiment, the power supply voltage network is connected to the positive terminal of the second diode through a second capacitor, the power supply voltage network is connected to the negative terminal of the second diode through a tenth resistor, the second diode is connected in parallel with a third capacitor, the positive terminal of the second diode is also connected to the +InB pin through an eleventh resistor, and the negative terminal of the second diode is also connected to the +InB pin through a twelfth resistor.

[0035] In one embodiment, the charging control circuit further includes a third control chip, which has a first positive pin, a first positive pin, and a negative pin; the first positive pin of the third control chip receives a third reference voltage, the first positive pin of the third control chip receives a fourth reference voltage, and the negative pin of the third control chip is connected to the power supply voltage network and the pull-up resistor.

[0036] In another aspect, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps:

[0037] Real-time monitoring of the ambient temperature of the batteries in photovoltaic power generation equipment;

[0038] The system determines whether the ambient temperature of the battery is below a first low temperature threshold. If the ambient temperature is below the first low temperature threshold, charging the battery is not allowed. If the ambient temperature is above or equal to the first low temperature threshold, the photovoltaic power generation equipment charges the battery with a microcurrent.

[0039] When the ambient temperature of the battery is greater than the first low temperature threshold, the difference between the ambient temperature of the battery and the second low temperature threshold is determined, and the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, the battery is continuously charged with a microcurrent.

[0040] When the ambient temperature of the battery is lower than the second low temperature threshold, the charging current of the battery is monitored in real time.

[0041] The charging current value of the battery is compared with the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, the battery is charged but not allowed to be heated. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged.

[0042] In another aspect, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0043] Real-time monitoring of the ambient temperature of the batteries in photovoltaic power generation equipment;

[0044] The system determines whether the ambient temperature of the battery is below a first low temperature threshold. If the ambient temperature is below the first low temperature threshold, charging the battery is not allowed. If the ambient temperature is above or equal to the first low temperature threshold, the photovoltaic power generation equipment charges the battery with a microcurrent.

[0045] When the ambient temperature of the battery is greater than the first low temperature threshold, the difference between the ambient temperature of the battery and the second low temperature threshold is determined, and the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, the battery is continuously charged with a microcurrent.

[0046] When the ambient temperature of the battery is lower than the second low temperature threshold, the charging current of the battery is monitored in real time.

[0047] The charging current value of the battery is compared with the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, the battery is charged but not allowed to be heated. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged.

[0048] The aforementioned battery charging method, device, computer equipment, and storage medium in photovoltaic power generation, by setting four states according to the temperature environment—disallowing battery charging, performing micro-current charging on the battery, charging the battery only without heating the battery, and the battery entering heating mode and charging—is suitable for lithium battery charging strategies under low temperature and limited charging energy conditions, protecting the battery and avoiding excessively rapid battery energy consumption. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a diagram illustrating the application environment of a battery charging method in photovoltaic power generation in one embodiment.

[0051] Figure 2 This is a flowchart illustrating a battery charging method in photovoltaic power generation in one embodiment;

[0052] Figure 3 For a specific threshold value in one embodiment, the corresponding value is... Figure 2 Logical judgment diagram;

[0053] Figure 4 This is a structural block diagram of a photovoltaic power generation circuit in one embodiment;

[0054] Figure 5 This is a schematic diagram of the charging control circuit in one embodiment;

[0055] Figure 6 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0057] The battery charging method for photovoltaic power generation provided in this application can be applied to, for example... Figure 1 In the application environment shown, terminal 102 communicates with server 104 via a network. Terminal 102 can be, but is not limited to, various personal computers, laptops, smartphones, tablets, and portable wearable devices, and server 104 can be a standalone server or a server cluster consisting of multiple servers.

[0058] In one embodiment, such as Figure 2 As shown, a battery charging method in photovoltaic power generation is provided, which can be applied to... Figure 1 Taking server 104 as an example, the following steps are included:

[0059] Step S1: Monitor the ambient temperature of the batteries in the photovoltaic power generation equipment in real time;

[0060] Step S2: Determine the difference between the ambient temperature of the battery and a first low temperature threshold. If the ambient temperature of the battery is less than the first low temperature threshold, charging the battery is not allowed. If the ambient temperature of the battery is greater than or equal to the first low temperature threshold, the photovoltaic power generation equipment charges the battery with a microcurrent.

[0061] Step S3: When the ambient temperature of the battery is greater than the first low temperature threshold, determine the difference between the ambient temperature of the battery and the second low temperature threshold, wherein the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, continue to charge the battery with a microcurrent.

[0062] Step S4: When the ambient temperature of the battery is lower than the second low temperature threshold, monitor the charging current of the battery in real time.

[0063] Step S5: Determine the difference between the charging current value of the battery and the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, only charge the battery and do not allow heating the battery. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged.

[0064] In this embodiment, after the battery enters the heating mode and charges, the following steps are further included:

[0065] Real-time monitoring of battery temperature;

[0066] The temperature value of the battery is compared with the normal operating temperature threshold, wherein the normal operating temperature threshold is greater than the second low temperature threshold.

[0067] If the temperature of the battery is lower than the normal operating temperature threshold, the battery will continue to be heated.

[0068] When the temperature of the battery is greater than or equal to the normal operating temperature threshold, heating of the battery is stopped and the battery enters normal charging mode.

[0069] In this embodiment, the battery in the photovoltaic power generation includes a lithium battery; the first low temperature threshold is -20°C; the second low temperature threshold is 0°C; the microcurrent threshold is 0.05°C; and the normal operating temperature threshold is 10°C.

[0070] like Figure 3 The figure shows the corresponding threshold values ​​for this application. Figure 2 The logic diagram.

[0071] In the above-mentioned battery charging method for photovoltaic power generation, four states are set according to the temperature environment: no charging of the battery, micro-current charging of the battery, charging only the battery and not heating the battery, and the battery entering the heating mode and charging. This is a charging strategy suitable for lithium batteries under low temperature and limited charging energy conditions, which protects the battery and avoids the battery energy being consumed too quickly.

[0072] It should be understood that, although Figure 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0073] In one embodiment, such as Figure 3 As shown, a photovoltaic power generation circuit is provided to implement the battery charging method in photovoltaic power generation described above. The photovoltaic power generation circuit includes: a positive electrode trace 1, a negative electrode trace 2, a battery 3, a first charging PMOS transistor 4, a second charging PMOS transistor 5, a heating element 6, a heating NMOS transistor 7, and a charging control circuit 8.

[0074] The circuit includes a positive electrode trace 1 with a charging terminal and a discharging terminal; a negative electrode trace 2, corresponding to the positive electrode trace 1 and grounded; a battery 3 with a positive terminal and a negative terminal; the positive terminal of the battery 3 is connected to the discharging terminal, and the negative terminal of the battery 3 is connected to the negative electrode trace 2; a first charging PMOS transistor 4, with its drain connected to the charging terminal; a second charging PMOS transistor 5, with its drain connected to the discharging terminal, and its source connected to the first charging PMOS transistor 4; a heating element 6, with one end connected to the charging terminal; a heating NMOS transistor 7, with its drain connected to the other end of the heating element 6, and its source connected to the negative electrode trace 2; and a charging control circuit 8, which inputs a charging enable signal and is connected to the gate of the first charging PMOS transistor 4, the gate of the second charging PMOS transistor 5, and the gate of the heating NMOS transistor 7.

[0075] In this embodiment, the photovoltaic power generation circuit further includes: a photovoltaic power generation device and a load. The photovoltaic power generation device is connected to the charging terminal of the positive electrode line 1 and the negative electrode line 2; the load is connected to the discharging terminal of the positive electrode line 1 and the negative electrode line 2.

[0076] The load is a load device, including but not limited to monitoring devices in transmission lines, and may also include data transmission equipment such as network bridges in transmission lines, as well as various sensors.

[0077] Based on the characteristics of batteries, this application prioritizes non-heating charging methods while ensuring safety and reliability. When heating is necessary, photovoltaic charging energy is used as the heating energy source, and the battery is only allowed to supply power to the load, thus preventing premature energy loss due to battery participation in heating.

[0078] In this embodiment, two charging states and one heating state can be achieved.

[0079] 1) First charging state: When the charging current of the battery 3 is less than the micro-current threshold and the ambient temperature of the battery 3 is greater than the first low temperature threshold, it is in the micro-current charging state; the charging control circuit 8 controls the first charging PMOS transistor 4 and the second charging PMOS transistor 5 to be turned on, and the charging control circuit 8 controls the heating NMOS transistor 7 to be turned off, so as to maintain micro-current charging of the battery 3. The current flows to the battery 3 through the first charging PMOS transistor 4 and the second charging PMOS transistor 5, and the battery 3 continuously supplies power to the load.

[0080] In other words, when the current is less than 0.05C and the temperature is greater than -20℃, it is a small current charging, the charging MOSFET is turned on, the heating MOSFET is turned off, and the current flows through the charging MOSFET to battery 3, and battery 3 continuously supplies power to the load.

[0081] 2) Second charging state: When the charging current of the battery 3 is greater than the micro current threshold and the temperature of the battery 3 is greater than or equal to the normal operating temperature threshold, it is in the rated charging state and provides a normal operating temperature threshold temperature hysteresis; the charging control circuit 8 controls the first charging PMOS transistor 4 and the second charging PMOS transistor 5 to be turned on, and the charging control circuit 8 controls the heating NMOS transistor 7 to be turned off, so as to charge the battery 3. The current flows to the battery 3 through the first charging PMOS transistor 4 and the second charging PMOS transistor 5, and the battery 3 continuously supplies power to the load.

[0082] That is, when the current is greater than 0.05C and the temperature is greater than 10℃, it is in the rated charging state and provides a 10℃ temperature hysteresis. The charging MOSFET is turned on and the heating MOSFET is turned off. The current flows to battery 3 through the charging MOSFET, and battery 3 continuously supplies power to the load.

[0083] 3) Heating state: When the charging current of the battery 3 is greater than the micro current threshold and the ambient temperature of the battery 3 is less than the second low temperature threshold, it is in the heating state; the charging control circuit 8 controls the first charging PMOS transistor 4 and the second charging PMOS transistor 5 to be disconnected, the charging control circuit 8 controls the heating NMOS transistor 7 to be turned on, and the battery 3 continuously supplies power to the load.

[0084] In other words, when the current is greater than 0.05C and the temperature is less than 0℃, it is in heating state. The charging MOSFET is turned off, the heating MOSFET is turned on, and battery 3 continuously supplies power to the load.

[0085] In the photovoltaic power generation circuit, the charging terminal and the discharging terminal are connected via a current sampling resistor and a first charging PMOS transistor 4 and a second charging PMOS transistor 5 (hereinafter referred to as charging MOS transistors) arranged back-to-back. The charging terminal and GND are connected via a heating element 6 and a heating NMOS transistor 7 (hereinafter referred to as heating MOS transistor). The battery 3 is connected to the load in a conventional manner. The charging MOS transistor and the heating MOS transistor are controlled by temperature and current and have a mutual exclusion relationship to ensure that charging and heating can only be selected for operation at one time in the power path.

[0086] like Figure 5 As shown, in this embodiment, the charging control circuit 8 includes: a first control chip U16 chip, a second control chip U24 chip, and a third control chip U25 chip.

[0087] The first control chip U16 has OUTA, OUTB, -InA, +InA, -InB, +InB, -Vs, and +Vs pins. The -Vs pin is grounded. The +Vs pin is connected to ground via a first capacitor C7, and the power supply voltage network PWR is connected to the +Vs pin via a first resistor R89. The OUTA pin is connected to the +InA pin via a first diode U19 and a second resistor R47 connected in series. A first reference voltage of 2.5V is connected to the +InA pin via a third resistor R50. A second reference voltage C+ is connected to the -InB pin via a fourth resistor R92. The -InB pin is connected to the OUTB pin via a fifth resistor R93. The power supply voltage network PWR is connected via a sixth resistor R51, a thermistor NTC2, and a seventh resistor connected in series. Resistor R48 is grounded. The thermistor NTC2 has a thermistor positive pin NTC+, a first thermistor negative pin NTC-_1, and a second thermistor negative pin NTC-_2. The thermistor positive pin NTC+ is connected to both the sixth resistor R51 and the -InA pin. The first thermistor negative pin NTC-_1 and the second thermistor negative pin NTC-_2 are connected to both the seventh resistor R48. The power supply voltage network PWR is connected to the positive terminal of the second diode D4 through the second capacitor C13. The power supply voltage network PWR is connected to the negative terminal of the second diode D4 through the tenth resistor R57. The second diode D4 is connected in parallel with the third capacitor C10. The positive terminal of the second diode D4 is also connected to the +InB pin through the eleventh resistor R91, and the negative terminal of the second diode D4 is also connected to the +InB pin through the twelfth resistor R85.

[0088] The second control chip U24 has a first positive pin anode1, a first positive pin anode2, and a negative pin cathode. The first positive pin anode1 of the second control chip U24 is connected to the OUTB pin, and the first positive pin anode2 of the second control chip U24 is connected to the OUTA pin. The negative pin cathode of the second control chip U24 is connected to the base (B) of transistor Q24 through an eighth resistor R64. A ninth resistor R42 is connected between the base (B) and emitter (E) of transistor Q24. The emitter (E) of transistor Q24 is grounded. The collector (C) of transistor Q24 is connected to the EN-HEAT output terminal. The power supply voltage network PWR is connected to the EN-HEAT output terminal through a pull-up resistor R43. The output of the second control chip U24 generates the control signal EN-HEAT through transistor Q24 and pull-up resistor R43 to control the first charging PMOS transistor 4, the second charging PMOS transistor 5, and the heating NMOS transistor 7.

[0089] The third control chip U25 has a first positive pin anode1, a first positive pin anode2, and a negative pin cathode. The first positive pin anode1 of the third control chip U25 is connected to the third reference voltage CHR+, the first positive pin anode2 of the third control chip U25 is connected to the fourth reference voltage BAT+, and the negative pin cathode of the third control chip U25 is connected to the power supply voltage network PWR and the pull-up resistor R43.

[0090] It is understandable that the charging control circuit 8 can be divided into three main functions: temperature loop control, current loop control, and drive control.

[0091] Temperature loop control: Temperature switch R89 is used for -20℃. When the temperature is below -20℃, the control circuit is de-energized, and the control pin of transistor Q24 inputs a low level. 0℃ and 10℃ are achieved by tracking the voltage on the thermistor NTC2. The system tracks the internal temperature of battery 3 using a thermistor. The non-inverting input uses the same supply voltage network PWR as the inverting input, providing an ambient temperature-related voltage signal to the inverting input of the operational amplifier. Based on the thermistor resistance value corresponding to the preset target threshold temperature of 0℃, a reference circuit consisting of R94, R95, and R96 is established at the inverting input, where R51=R94, R48=R96, and R95=NTC2 (at 0℃). When the preset 0℃ temperature threshold is reached, the thermistor resistance value is equal to that of R95, and the control state flips. When the temperature reaches the 10℃ threshold, the thermistor reaches another specific resistance value, generating another comparison threshold voltage. The control circuit achieves equivalence of this voltage through a specific loop consisting of U19 and R47, thereby realizing the control state flip. That is, the level response to two temperature thresholds is achieved through analogy rather than a reference method.

[0092] Current loop control: The current control hysteresis circuit composed of R92 and R93 causes the op-amp output level to flip at 0.05C according to the magnitude of the charging current and provides level output anti-jitter function.

[0093] Drive control: The two outputs of the operational amplifier, composed of a current loop and a temperature converter, are ORed through U24. The output of U24 generates a control signal EN-HEAT through transistor Q24 and pull-up resistor R43, which controls the charging MOSFET and the heating MOSFET, thereby controlling the switching between charging and heating states of the control circuit. The charging MOSFET and the heating MOSFET use opposite drive levels to achieve mutual exclusion, avoiding the problem of simultaneous conduction of the battery heating element 6.

[0094] according to Figure 5 The logic block diagram shown creates a working state that can achieve two charging states and one heating state.

[0095] 1) First charging state: When the current is less than 0.05C and the temperature is greater than -20℃, it is a small current charging state. The charging MOSFET 4 is turned on and the heating MOSFET is turned off. The current flows to the battery 3 through the charging MOSFET, and the battery 3 continuously supplies power to the load.

[0096] 2) Second charging state: When the current is greater than 0.05C and the temperature is greater than 10℃, it is the rated charging state and provides a 10℃ temperature hysteresis. The charging MOSFET is turned on and the heating MOSFET is turned off. The current flows to battery 3 through the charging MOSFET and battery 3 continuously supplies power to the load.

[0097] 3) Heating state: When the current is greater than 0.05C and the temperature is less than 0℃, it is in the heating state. The charging MOSFET is turned off and the heating MOSFET is turned on, and battery 3 continuously supplies power to the load.

[0098] The charging control circuit 8 is a referenceless state switching circuit, characterized in that a comparison threshold is obtained by the resistance value of an analog sensor, and another resistance threshold of the analog sensor is obtained by a feedback circuit. The sensor includes, but is not limited to, a thermistor, and may also include a sensor that senses various environmental parameters as variable resistance values.

[0099] In the aforementioned photovoltaic power generation circuit, four states are set according to the temperature environment: no charging of the battery, micro-current charging of the battery, charging only the battery and not heating the battery, and the battery entering heating mode and charging. This is a charging strategy suitable for lithium batteries under low temperature and limited charging energy conditions, which protects the battery and avoids the battery energy being consumed too quickly.

[0100] This invention designs a heating and charging solution for low-temperature scenarios based on the characteristics of lithium batteries. Under the premise of ensuring battery safety and reliability, corresponding charging strategies are designed from the perspectives of different temperature ranges and different photovoltaic charging energies. This can maximize the battery energy storage capacity in low-temperature scenarios, providing a practical solution for the increasingly high energy consumption scenarios of transmission lines. It effectively ensures the continuous and stable operation of monitoring devices in high-altitude and cold regions, and provides strong support for the application of AI technology in the field of high-voltage transmission line monitoring devices.

[0101] This application can be used not only for monitoring high-voltage transmission lines, but also for photovoltaic charging in various high-altitude and cold regions.

[0102] For specific limitations on photovoltaic power generation circuits, please refer to the limitations on battery charging methods in photovoltaic power generation mentioned above, which will not be repeated here. Each circuit in the aforementioned photovoltaic power generation circuit can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the memory of a computer device as software, so that the processor can call and execute the operations corresponding to each module.

[0103] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6 As shown, the computer device includes a processor, memory, network interface, and database connected via a system bus. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores battery charging data in photovoltaic power generation. The network interface communicates with external terminals via a network connection. When the processor executes the computer program, it implements a battery charging method in photovoltaic power generation.

[0104] Those skilled in the art will understand that Figure 6 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0105] In one embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to perform the following steps:

[0106] Real-time monitoring of the ambient temperature of the batteries in photovoltaic power generation equipment;

[0107] The system determines whether the ambient temperature of the battery is below a first low temperature threshold. If the ambient temperature is below the first low temperature threshold, charging the battery is not allowed. If the ambient temperature is above or equal to the first low temperature threshold, the photovoltaic power generation equipment charges the battery with a microcurrent.

[0108] When the ambient temperature of the battery is greater than the first low temperature threshold, the difference between the ambient temperature of the battery and the second low temperature threshold is determined, and the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, the battery is continuously charged with a microcurrent.

[0109] When the ambient temperature of the battery is lower than the second low temperature threshold, the charging current of the battery is monitored in real time.

[0110] The charging current value of the battery is compared with the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, the battery is charged but not allowed to be heated. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged.

[0111] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0112] Real-time monitoring of the ambient temperature of the batteries in photovoltaic power generation equipment;

[0113] The system determines whether the ambient temperature of the battery is below a first low temperature threshold. If the ambient temperature is below the first low temperature threshold, charging the battery is not allowed. If the ambient temperature is above or equal to the first low temperature threshold, the photovoltaic power generation equipment charges the battery with a microcurrent.

[0114] When the ambient temperature of the battery is greater than the first low temperature threshold, the difference between the ambient temperature of the battery and the second low temperature threshold is determined, and the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, the battery is continuously charged with a microcurrent.

[0115] When the ambient temperature of the battery is lower than the second low temperature threshold, the charging current of the battery is monitored in real time.

[0116] The charging current value of the battery is compared with the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, the battery is charged but not allowed to be heated. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged.

[0117] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery charging method in photovoltaic power generation, characterized in that, include: Real-time monitoring of the ambient temperature of the batteries in photovoltaic power generation equipment; The system determines whether the ambient temperature of the battery is below a first low temperature threshold. If the ambient temperature is below the first low temperature threshold, charging the battery is not allowed. If the ambient temperature is above or equal to the first low temperature threshold, the photovoltaic power generation device charges the battery with a microcurrent. When the ambient temperature of the battery is greater than the first low temperature threshold, the difference between the ambient temperature of the battery and the second low temperature threshold is determined, and the second low temperature threshold is greater than the first low temperature threshold; if the ambient temperature of the battery is less than the second low temperature threshold, the battery is continuously charged with a microcurrent. When the ambient temperature of the battery is lower than the second low temperature threshold, the charging current of the battery is monitored in real time. The system determines whether the charging current value of the battery is greater than or equal to the micro-current threshold. If the charging current value of the battery is less than the micro-current threshold, the battery is charged but not allowed to be heated. If the charging current value of the battery is greater than or equal to the micro-current threshold, the battery enters the heating mode and is charged. When the charging current of the battery is less than the micro current threshold and the ambient temperature of the battery is greater than the first low temperature threshold, or when the charging current of the battery is greater than the micro current threshold and the temperature of the battery is greater than the normal operating temperature threshold, or when the charging current of the battery is greater than the micro current threshold and the temperature of the battery is less than the second low temperature threshold, the battery continues to supply power to the load.

2. The battery charging method in photovoltaic power generation according to claim 1, characterized in that, After the battery enters the heating mode and begins charging, the following steps are also included: Real-time monitoring of battery temperature; The temperature value of the battery is compared with the normal operating temperature threshold, wherein the normal operating temperature threshold is greater than the second low temperature threshold. If the temperature of the battery is lower than the normal operating temperature threshold, the battery will continue to be heated. When the temperature of the battery is greater than or equal to the normal operating temperature threshold, heating of the battery is stopped and the battery enters normal charging mode.

3. The battery charging method in photovoltaic power generation according to claim 2, characterized in that, The photovoltaic power generation battery includes a lithium battery; the first low temperature threshold is -20℃; the second low temperature threshold is 0℃; the microcurrent threshold is 0.05C; and the normal operating temperature threshold is 10℃.

4. A photovoltaic power generation circuit for implementing the battery charging method in photovoltaic power generation as described in any one of claims 1 to 3, characterized in that, include: The positive terminal is equipped with a charging terminal and a discharging terminal; The negative terminal trace is configured to correspond with the positive terminal trace and grounded; The battery has a positive terminal and a negative terminal; the positive terminal of the battery is connected to the discharge terminal, and the negative terminal of the battery is connected to the negative terminal trace; The first charging PMOS transistor has its drain connected to the charging terminal; The second charging PMOS transistor has its drain connected to the discharge terminal and its source connected to the first charging PMOS transistor. A heating element, one end of which is connected to the charging terminal; A heated NMOS transistor is connected with its drain to the other end of the heating element and its source to the negative electrode trace. as well as The charging control circuit receives a charging enable signal and is connected to the gate of the first charging PMOS transistor, the gate of the second charging PMOS transistor, and the gate of the heating NMOS transistor.

5. The photovoltaic power generation circuit according to claim 4, characterized in that, Also includes: Photovoltaic power generation equipment, connected to the charging terminal of the positive electrode wiring and the negative electrode wiring; and The load is connected to the discharge terminal of the positive electrode trace and the negative electrode trace.

6. The photovoltaic power generation circuit according to claim 4, characterized in that, When the charging current of the battery is less than the micro-current threshold and the ambient temperature of the battery is greater than the first low temperature threshold, it is in a micro-current charging state; the charging control circuit controls the first charging PMOS transistor and the second charging PMOS transistor to be turned on, and the charging control circuit controls the heating NMOS transistor to be turned off, so as to maintain micro-current charging of the battery. The current flows to the battery through the first charging PMOS transistor and the second charging PMOS transistor, and the battery continuously supplies power to the load; When the charging current of the battery is greater than the micro-current threshold and the temperature of the battery is greater than or equal to the normal operating temperature threshold, it is in the rated charging state and provides a normal operating temperature threshold temperature hysteresis; the charging control circuit controls the first charging PMOS transistor and the second charging PMOS transistor to be turned on, and the charging control circuit controls the heating NMOS transistor to be turned off, so as to charge the battery. The current flows to the battery through the first charging PMOS transistor and the second charging PMOS transistor, and the battery continuously supplies power to the load; When the charging current of the battery is greater than the micro-current threshold and the ambient temperature of the battery is less than the second low temperature threshold, it is in a heating state; the charging control circuit controls the first charging PMOS transistor and the second charging PMOS transistor to disconnect, and the charging control circuit controls the heating NMOS transistor to turn on, so that the battery continuously supplies power to the load.

7. The photovoltaic power generation circuit according to claim 4, characterized in that, The charging control circuit includes: The first control chip has OUTA pin, OUTB pin, -InA pin, +InA pin, -InB pin, +InB pin, -Vs pin, and +Vs pin; wherein the -Vs pin is grounded; the +Vs pin is connected to a first capacitor and then grounded, and the power supply voltage network is connected to the +Vs pin through a first resistor; the OUTA pin is connected to the +InA pin through a first diode and a second resistor in series; a first reference voltage is connected to the +InA pin through a third resistor; a second reference voltage is connected to the -InB pin through a fourth resistor; the -InB pin is connected to the OUTB pin through a fifth resistor; the power supply voltage network is grounded through a sixth resistor, a thermistor, and a seventh resistor connected in series; the thermistor has a thermistor positive terminal, a first thermistor negative terminal, and a second thermistor negative terminal; the thermistor positive terminal is connected to both the sixth resistor and the -InA pin, and the first thermistor negative terminal and the second thermistor negative terminal are both connected to the seventh resistor; The second control chip has a first positive pin, a first positive pin, and a negative pin. The first positive pin of the second control chip is connected to the OUTB pin, and the first positive pin of the second control chip is connected to the OUTA pin. The negative pin of the second control chip is connected to the base of the transistor through an eighth resistor. A ninth resistor is connected between the base and emitter of the transistor. The emitter of the transistor is grounded. The collector of the transistor is connected to the control signal output terminal. The power supply voltage network is connected to the control signal output terminal through a pull-up resistor. The second control chip outputs a control signal generated through the transistor and the pull-up resistor to control the first charging PMOS transistor, the second charging PMOS transistor, and the heating NMOS transistor.

8. The photovoltaic power generation circuit according to claim 7, characterized in that, The power supply voltage network is connected to the positive terminal of the second diode through the second capacitor, and the power supply voltage network is connected to the negative terminal of the second diode through the tenth resistor. The second diode is connected in parallel with the third capacitor. The positive terminal of the second diode is also connected to the +InB pin through the eleventh resistor, and the negative terminal of the second diode is also connected to the +InB pin through the twelfth resistor.

9. The photovoltaic power generation circuit according to claim 7, characterized in that, The charging control circuit also includes: The third control chip has a first positive pin, a first positive pin, and a negative pin; the first positive pin of the third control chip is input to a third reference voltage, the first positive pin of the third control chip is input to a fourth reference voltage, and the negative pin of the third control chip is connected to the power supply voltage network and the pull-up resistor.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 3.

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