Battery energy-saving thermal management system and method for wind-solar complementary power supply

Abstract

The invention discloses a battery energy-saving thermal management system and method for wind-solar complementary power supply, and the system comprises a wind-solar power generation unit, a wind-solar control unit, a battery, a battery management unit, a heating unit, and a temperature control unit. Calculating evaluation parameters for representing the power contribution degree of the wind-solar power generation unit to the heating unit; a start-stop control signal for the heating unit is generated; by introducing evaluation parameters used for representing the contribution degree of wind and light power generation to the heating power, intelligent control based on multi-source information fusion is formed, and dynamic matching of heating start and stop and the wind and light power generation capacity is achieved; according to the method, the heating process is efficiently carried out only when the wind-solar power generation is sufficient, and can be quitted in time when the contribution is insufficient, so that the instant utilization rate of renewable energy sources is improved, and the energy utilization efficiency and long-term operation stability of the wind-solar complementary power supply system in an extremely low-temperature environment are improved.

Description

Technical Field

[0001] This invention relates to new energy power generation and energy storage, and more particularly to a battery energy-saving thermal management system and method for wind-solar hybrid power supply. Background Technology

[0002] Unmanned field equipment deployed in remote, frigid regions often employs a wind-solar hybrid power supply system consisting of wind turbines, photovoltaic panels, energy storage batteries, and controllers to ensure continuous operation. To address battery performance degradation and charging difficulties caused by extreme low temperatures, existing technologies typically add heating devices to the battery compartment and adopt a control strategy based on battery temperature thresholds—initiating heating when the battery temperature drops below a set value. However, the power generation capacity of wind-solar hybrid systems is intermittent and fluctuating due to natural conditions, and such a singular temperature control strategy does not differentiate between the sources of heating energy. In actual operation, especially during periods of insufficient wind and solar resources, the energy required for heating must essentially be provided by the energy storage batteries themselves. This directly leads to the system's already limited and valuable energy storage being used for self-heating. This problem triggers a vicious cycle of "depleting battery power to protect it," not only wasting energy but also severely shortening the continuous operating time of the power supply system. It can even cause premature power failure of the entire monitoring or communication equipment due to over-discharge of the batteries, seriously threatening the power supply reliability of critical equipment in harsh environments. Summary of the Invention

[0003] Purpose of the invention: The purpose of this invention is to provide a battery energy-saving thermal management system for wind-solar hybrid power supply that can sense the external energy supply status, intelligently coordinate heating energy consumption and power generation surplus, thereby maximizing energy storage conservation and improving the overall system range and operational reliability while ensuring battery rechargeability; on the other hand, it provides a battery energy-saving thermal management method for wind-solar hybrid power supply.

[0004] Technical Solution: The battery energy-saving thermal management system for wind-solar hybrid power supply of the present invention includes a wind-solar power generation unit, a wind-solar control unit, a battery, a battery management unit, and a heating unit. The input terminal of the wind-solar control unit is connected to the wind-solar power generation unit and is used to manage the electrical energy generated by the wind-solar power generation unit. The battery management unit is connected to the battery and is used to collect the battery's state parameters and manage the battery's charging and discharging. It also includes a temperature control unit, which is communicatively connected to both the wind-solar control unit and the battery management unit to obtain the power generation state parameters of the wind-solar power generation unit and the battery state parameters. The battery state parameters include at least the battery temperature. The temperature control unit calculates evaluation parameters characterizing the power contribution of the wind-solar power generation unit to the heating unit based on the power generation state parameters and the battery state parameters. It then generates and outputs start / stop control signals for the heating unit based on the battery temperature and the evaluation parameters.

[0005] Preferably, the temperature control unit is connected to the heating control relay via a switch output line. The heating control relay is connected in series in the power supply circuit of the heating unit and is used to control the on / off state of the heating unit according to the start / stop control signal.

[0006] Preferably, it also includes a DC / DC conversion module, the input of which is connected to the power output of the wind and solar control unit and the battery management unit, and its output provides operating power to the temperature control unit. The evaluation parameter is the ratio of the power provided by the wind and solar power generation unit to the power provided by the battery to the heating unit.

[0007] Preferably, the wind and solar power generation unit includes a wind turbine and a photovoltaic panel, and the input terminal of the wind and solar control unit is connected to the wind turbine and the photovoltaic panel respectively; the power generation status parameters include the output voltage of the wind turbine and the output voltage of the photovoltaic panel.

[0008] Preferably, the evaluation parameter is the ratio of the power supplied to the heating unit by the wind and solar power generation unit to the power supplied to the heating unit by the battery; the temperature control unit calculates the ratio based on the power generation status parameters, the battery output voltage and battery output current in the battery status parameters, and the resistance value of the heating unit.

[0009] Preferably, the temperature control unit outputs a control signal to start the heating unit when the battery temperature is lower than or equal to a first temperature threshold and the power generation status parameter indicates that the power generation capacity is higher than or equal to a first capacity threshold; after the heating unit is started, the temperature control unit outputs a control signal to stop the heating unit if the battery temperature, the evaluation parameter, and the power generation status parameter meet the corresponding conditions.

[0010] The corresponding condition is that the battery temperature is higher than or equal to the second temperature threshold;

[0011] Or the evaluation parameter is lower than or equal to a preset parameter threshold;

[0012] Or the power generation status parameter indicates that the power generation capacity is lower than or equal to the second capacity threshold.

[0013] Preferably, the temperature control unit is further configured to calculate the battery's heating rate based on the battery temperature in the battery status parameters, and generate an alarm signal for abnormal heat preservation when the heating rate exceeds a preset range.

[0014] A battery energy-saving thermal management method for wind-solar hybrid power supply includes:

[0015] Obtain the power generation status parameters of the wind and solar power generation units;

[0016] Obtain the battery status parameters from the battery management unit, including at least the battery temperature;

[0017] Based on the power generation state parameters and the battery state parameters, evaluation parameters are calculated to characterize the power contribution of the wind and solar power generation unit to the heating unit.

[0018] Based on the battery temperature and evaluation parameters, start-stop control commands for the heating unit are generated and executed.

[0019] Preferably, the generation of start / stop control commands includes:

[0020] When the battery temperature is lower than or equal to a first temperature threshold, and the power generation status parameter indicates that the power generation capacity is higher than or equal to a first capacity threshold, a start command is generated;

[0021] During the heating process, a stop command is generated when the evaluation parameter is lower than or equal to a preset parameter threshold.

[0022] Preferably, the method further includes the steps of: counting the number of stop events triggered within a set time window due to the evaluation parameter being lower than the parameter threshold; and disabling the heating start function in subsequent set time windows when the number of stop events exceeds the limit.

[0023] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: By introducing evaluation parameters to characterize the contribution of wind and solar power generation to heating power, and combining this with a collaborative decision-making model based on battery temperature, a smart control logic based on multi-source information fusion is formed, achieving dynamic matching between heating start / stop and wind and solar power generation capacity. This method ensures that the heating process only operates efficiently when wind and solar power generation is sufficient, and can be promptly stopped when their contribution is insufficient. This not only improves the immediate utilization rate of renewable energy, but also solves the problem of unnecessary battery energy consumption caused by the unidirectional temperature control logic in existing technologies, significantly improving the energy efficiency and long-term operational stability of wind-solar hybrid power supply systems in extreme low-temperature environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the system connection of the present invention;

[0025] Figure 2 This is a logic diagram of the method of the present invention. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-2 The technical solution of the present invention will be further described below.

[0027] like Figure 1As shown, this embodiment provides a battery energy-saving thermal management system for wind-solar hybrid power supply. This system aims to address the issues of decreased charging efficiency and shortened lifespan of batteries in wind-solar hybrid power supply systems under extreme low-temperature environments. By introducing an intelligent temperature control strategy, it achieves optimal energy allocation and management. The system's hardware architecture includes a wind-solar power generation unit, a wind-solar control unit, a battery, a battery management unit, a heating unit, a temperature control unit, a heating control relay, and a DC / DC conversion module. The input terminal of the wind-solar control unit is connected to the wind-solar power generation unit to manage the electrical energy generated by the unit. The battery management unit is connected to the battery to collect battery status parameters and manage battery charging and discharging. The wind-solar control unit and the battery management unit are communicatively connected to coordinate the overall energy distribution of the system. The power output terminals of the wind-solar control unit and the battery management unit are connected to the heating unit, jointly providing operating power to the heating unit.

[0028] The wind and solar power generation unit includes a wind turbine and photovoltaic panels. The input terminals of the wind and solar control unit are connected to the wind turbine and photovoltaic panels, respectively, to convert wind and solar energy into electrical energy. The battery, as the system's energy storage unit, is connected to the battery management unit, which is responsible for its charging and discharging management and for collecting battery status parameters. A heating unit (usually a resistance heater) is located near the battery to heat it at low temperatures. A heating control relay is connected in series in the power supply circuit of the heating unit; its control coil is controlled by the temperature control unit, and the power supply comes from the power output terminals of the wind and solar control unit and the battery management unit. The input terminal of the DC / DC conversion module is connected to the power output terminals of the wind and solar control unit and the battery management unit (e.g., the system bus voltage is 28V), and its output terminal provides operating power (e.g., a stable 12V) to the temperature control unit.

[0029] The core of this invention lies in the temperature control unit and the intelligent control strategy it executes. The temperature control unit establishes communication connections with the wind and solar control unit and the battery management unit via a communication bus (such as an RS485 bus), thereby enabling it to acquire two key parameters in real time: first, power generation status parameters from the wind and solar control unit, specifically the wind turbine output voltage and the photovoltaic panel output voltage, used to assess the current wind and solar power generation capacity; second, battery status parameters from the battery management unit, including at least the battery temperature, and typically also the battery output voltage and battery output current.

[0030] The temperature control unit executes the following based on the acquired power generation state parameters and battery state parameters: Figure 2 The intelligent temperature control strategy shown is based on the calculation of a key evaluation parameter to quantitatively characterize the power contribution of the wind and solar power generation unit to the heating unit. This evaluation parameter is defined as the power supplied by the wind and solar power generation unit to the heating unit. The power supplied by the battery to the heating unit The ratio. Specifically, the temperature control unit can determine the ratio based on the power generation state parameters and the battery output voltage from the battery state parameters. Resistance value of heating unit Battery output current before heating begins in the battery status parameters and the battery output current during the heating process The calculation is performed as follows:

[0031] ;

[0032] The ratio is calculated using the formula above. A larger ratio indicates that the power required for heating is mainly provided by wind and solar power generation, and the energy consumption of the battery itself is less.

[0033] Based on the battery temperature and the evaluation parameters calculated above, the temperature control unit collaboratively generates and outputs a start / stop control signal for the heating unit. This signal is output to the heating control relay via a switch output line, ultimately controlling the on / off state of the heating unit. Its control logic is a complete process including conditional judgment, cyclic monitoring, and multiple exit mechanisms. After system startup, the temperature control unit first determines whether the temperature control process start conditions are met. These conditions must be met simultaneously: the battery temperature is less than or equal to the minimum charging temperature (first temperature threshold); the number of historical abnormal alarms recorded per unit time does not exceed a preset limit; and the power generation status parameter indicates that the power generation capacity is greater than or equal to the set value (e.g., the output voltage of the fan or photovoltaic panel is greater than or equal to 28V, i.e., the first capacity threshold). If all three conditions are met, the temperature control unit outputs a start signal, activating the heating control relay and starting the heating unit.

[0034] After heating is initiated, the system enters a cyclic monitoring and dynamic decision-making phase. The temperature control unit continuously reads the battery temperature, battery output voltage, battery output current, fan voltage, and photovoltaic panel voltage. First, the system calculates the real-time heating rate of the battery, i.e., the change in battery temperature per unit time. The specific calculation method for the heating rate is as follows:

[0035] ;

[0036] in, The temperature of the battery before heating The temperature of the battery after heating. This refers to the heating time.

[0037] This heating rate is not only used to monitor the heating effect, but also to diagnose the sealing performance of the battery casing structure: if the calculated heating rate is not within the preset normal range, it indicates that the battery's insulation structure may have failed to seal, resulting in excessive heat loss. At this time, the temperature control unit will record an "abnormal battery temperature alarm" and immediately output a signal to shut down the heating unit to avoid unnecessary energy consumption.

[0038] If the heating rate is normal, the temperature control unit calculates the current wind / solar / battery heating power ratio (evaluation parameter). Next, the system determines if any of the temperature control process exit conditions are met. If the battery temperature, evaluation parameter, and power generation status parameter meet the corresponding conditions, a control signal to stop the heating unit is output: the corresponding conditions are: the battery temperature is higher than or equal to a second temperature threshold; or the evaluation parameter is lower than or equal to a preset parameter threshold; or the power generation status parameter indicates that the power generation capacity is lower than or equal to a second capacity threshold. If any of these conditions are met, the temperature control unit outputs a stop signal, disconnects the heating control relay, and stops heating. Specifically, if the exit is triggered by "evaluation parameter lower than or equal to a preset parameter threshold," meaning the evaluation parameter is too low (indicating insufficient wind and solar power contribution, with heating mainly relying on battery power), and the power generation status parameter still indicates that the power generation capacity is higher than the first capacity threshold (e.g., 28V), the system will record an additional "heating power abnormality alarm," indicating potential problems such as low power supply circuit efficiency.

[0039] In addition, the system includes an anomaly management mechanism. The temperature control unit counts the total number of the aforementioned anomaly alarms occurring within a unit of time (e.g., one hour). If the number exceeds the alarm count threshold, the system will prohibit the heating process from starting in the next unit of time period, meaning it will no longer respond to heating requests until the statistical window is updated and the count is reset to zero. This effectively prevents the system from operating ineffectively under continuous fault conditions.

[0040] In summary, the battery thermal management system and method for wind-solar hybrid power supply described in this embodiment integrates wind and solar power generation capacity and battery status information through a temperature control unit. It creatively introduces and coordinates control based on the "wind-solar / battery heating power ratio (evaluation parameter)," achieving dynamic matching between heating behavior and renewable energy availability. This method ensures efficient heating only when wind and solar power generation is abundant and timely protective shutdown when their contribution is insufficient. This maximizes energy conservation of the battery's own energy storage while ensuring the battery's low-temperature operating performance, significantly improving the energy utilization efficiency, operational reliability, and endurance of the entire wind-solar hybrid power supply system in extreme environments.

Claims

1. A battery-powered thermal management system for wind-solar hybrid power supply, comprising a wind-solar power generation unit, a wind-solar control unit, a battery, a battery management unit, and a heating unit; the input terminal of the wind-solar control unit is connected to the wind-solar power generation unit for managing the electrical energy generated by the wind-solar power generation unit; the battery management unit is connected to the battery for collecting battery status parameters and managing battery charging and discharging; characterized in that, It also includes a temperature control unit, which is communicatively connected to the wind and solar power control unit and the battery management unit to obtain the power generation status parameters of the wind and solar power generation unit and the battery status parameters. The battery status parameters include at least the battery temperature. The temperature control unit calculates evaluation parameters to characterize the power contribution of the wind and solar power generation unit to the heating unit based on the power generation status parameters and the battery status parameters. It also generates and outputs start-stop control signals for the heating unit based on the battery temperature and the evaluation parameters.

2. The battery energy-saving thermal management system according to claim 1, characterized in that, It also includes a heating control relay; the temperature control unit is connected to the heating control relay via a switch output line, and the heating control relay is connected in series in the power supply circuit of the heating unit to control the on / off state of the heating unit according to the start / stop control signal.

3. The battery energy-saving thermal management system according to claim 1, characterized in that, It also includes a DC / DC conversion module, the input of which is connected to the power output of the wind and solar control unit and the battery management unit, and its output provides operating power to the temperature control unit.

4. The battery energy-saving thermal management system according to claim 1, characterized in that, The wind and solar power generation unit includes a wind turbine and a photovoltaic panel. The input terminal of the wind and solar control unit is connected to the wind turbine and the photovoltaic panel respectively. The power generation status parameters include the output voltage of the wind turbine and the output voltage of the photovoltaic panel.

5. The battery energy-saving thermal management system according to claim 1, characterized in that, The evaluation parameter is the ratio of the power supplied to the heating unit by the wind and solar power generation unit to the power supplied to the heating unit by the battery; the temperature control unit calculates the ratio based on the power generation status parameters, the battery output voltage and battery output current in the battery status parameters, and the resistance value of the heating unit.

6. The battery energy-saving thermal management system according to claim 1, characterized in that, The temperature control unit outputs a control signal to start the heating unit when the battery temperature is lower than or equal to a first temperature threshold and the power generation status parameter indicates that the power generation capacity is higher than or equal to a first capacity threshold; after the heating unit is started, the temperature control unit outputs a control signal to stop the heating unit if the battery temperature, the evaluation parameter, and the power generation status parameter meet the corresponding conditions. The corresponding condition is that the battery temperature is higher than or equal to the second temperature threshold; Or the evaluation parameter is lower than or equal to a preset parameter threshold; Or the power generation status parameter indicates that the power generation capacity is lower than or equal to the second capacity threshold.

7. The battery energy-saving thermal management system according to claim 1, characterized in that, The temperature control unit is also used to calculate the battery's heating rate based on the battery temperature in the battery status parameters, and to generate an alarm signal for abnormal heat preservation when the heating rate exceeds a preset range.

8. A battery energy-saving thermal management method for wind-solar hybrid power supply, characterized in that, include: Obtain the power generation status parameters of the wind and solar power generation units; Obtain the battery status parameters from the battery management unit, including at least the battery temperature; Based on the power generation state parameters and the battery state parameters, evaluation parameters are calculated to characterize the power contribution of the wind and solar power generation unit to the heating unit. Based on the battery temperature and evaluation parameters, start-stop control commands for the heating unit are generated and executed.

9. The battery energy-saving thermal management method according to claim 8, characterized in that, The generation of start / stop control commands includes: When the battery temperature is lower than or equal to a first temperature threshold, and the power generation status parameter indicates that the power generation capacity is higher than or equal to a first capacity threshold, a start command is generated; During the heating process, a stop command is generated when the evaluation parameter is lower than or equal to a preset parameter threshold.

10. The battery energy-saving thermal management method according to claim 8, characterized in that, The method also includes the steps of: counting the number of stop events triggered within a set time window due to the evaluation parameter being lower than the parameter threshold; and disabling the heating start function within a subsequent set time window when the number of stop events exceeds the limit.

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