Management method of energy storage battery and related equipment thereof

Abstract

The invention relates to a management method of an energy storage battery and related equipment thereof, and relates to the technical field of energy storage inverters. One specific embodiment of the method comprises the following steps: when the current maximum discharge current value of an energy storage battery is lower than the working current value of a heating device and the temperature of a battery cell is lower than a first battery cell temperature threshold value, respectively establishing electric connection between the energy storage battery and an inverter and between the energy storage battery and the heating device through a battery management system, a battery management request is sent to the inverter controller; an inverter controller is used for carrying out power supply control on the inverter so as to charge the energy storage battery and supply power to the heating device, so that charging and heating management on the energy storage battery is executed; wherein in the power supply control process, the working current value is used as an initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as a target power supply current value. According to the embodiment, the battery is charged while being heated, and the working efficiency and the management effect of the energy storage battery are improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage inverters, and in particular to a management method for energy storage batteries and related equipment. Background Art

[0002] Energy storage inverters can help homes and businesses achieve self-sufficiency and reduce dependence on traditional power grids. They can store excess electricity through energy storage batteries for use at night or during non-production periods, thereby reducing electricity bills.

[0003] However, energy storage batteries also have certain disadvantages, especially in low temperature conditions, they may not be effectively used. For example, when the temperature is below -10°, the energy storage battery decays very quickly, and the operation of the energy storage battery under low temperature conditions will affect the battery life. Therefore, most battery manufacturers do not allow the energy storage battery to be charged and discharged under low temperature conditions. In this way, when the user's home has a load that needs to be discharged and maintained by the energy storage battery (battery discharge), or the photovoltaic energy matched with the energy storage inverter needs to be stored by the energy storage battery (battery charging), the energy storage battery is difficult to meet the demand.

[0004] Although the related technology provides a heating solution for energy storage batteries, which heats the energy storage batteries to achieve a better working state, during the heating process of the energy storage batteries, in order to ensure the safety of the energy storage batteries, the energy storage batteries cannot be charged at the same time, which affects the working efficiency of the energy storage batteries and limits the application scenarios of the energy storage inverter.

[0005] With respect to the above-mentioned problems in the related technologies, no effective solutions have been proposed yet. Summary of the invention

[0006] The energy storage battery management method and related equipment provided in the embodiments of the present invention at least solve the problem in the related art that the energy storage battery cannot be charged while heating the energy storage battery, resulting in low working efficiency of the energy storage battery and narrow application scenarios of the energy storage inverter.

[0007] In order to solve the above problem, one aspect of an embodiment of the present invention provides a method for managing an energy storage battery, including:

[0008] When the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device, and the battery cell temperature of the energy storage battery is lower than the first battery cell temperature threshold, the battery management system establishes electrical connections between the energy storage battery and the inverter and the heating device respectively, and sends a battery management request to the inverter controller;

[0009] The inverter controller controls the power supply of the inverter in response to the battery management request, thereby charging the energy storage battery and supplying power to the heating device, so as to perform charging and heating management of the energy storage battery; wherein, in the power supply control process, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value.

[0010] In some of the embodiments, during the process of performing charging and heating management of the energy storage battery, the method further includes:

[0011] The real-time cell temperature of the energy storage battery is obtained based on the battery management system, and when the real-time cell temperature is higher than the first cell temperature threshold, the electrical connection between the energy storage battery and the heating device is disconnected; wherein, the energy storage battery in the energy storage inverter is connected to the inverter via a positive power line and a negative power line, and a battery positive switch and a battery negative switch are respectively provided on the power lines, the energy storage battery and the heating device are both arranged in the energy storage battery pack, and a heating assembly formed by the heating device and the heating switch connected in series is respectively connected to the positive power line and the negative power line.

[0012] In some of the embodiments, during the process of performing charging and heating management of the energy storage battery, the method further includes:

[0013] Based on the battery management system, the real-time charging current value of the energy storage battery is obtained. If the real-time charging current value is greater than the maximum charging current value, a target power supply current value adjustment request is sent to the inverter controller so that the inverter controller adjusts the target power supply current value.

[0014] In some embodiments, before the step of controlling the inverter to supply power through the inverter controller so as to charge the energy storage battery and supply power to the heating device, the method further includes:

[0015] The inverter controller obtains the working parameters of the inverter, and determines whether the power supply conditions are met based on the working parameters; if met, the energy storage battery is charged and the heating device is supplied with power.

[0016] In some of the embodiments, before the step of sending the battery management request to the inverter controller, the method further includes:

[0017] Based on the battery management system, the current cell temperature, cell parameters and battery voltage of the energy storage battery are obtained, the current maximum discharge current value corresponding to the energy storage battery is calculated according to the current cell temperature and cell parameters, and the working current value corresponding to the heating device is calculated according to the battery voltage and the equivalent resistance value of the heating device;

[0018] Compare the current maximum discharge current value and the working current value. If the current maximum discharge current value is higher than the working current value, control the energy storage battery to supply power to the heating device based on the battery management system to perform heating management of the energy storage battery; if the current maximum discharge current value is lower than the working current value, send a battery management request to the inverter controller so that the inverter controller controls the power supply to the inverter, thereby performing charging and heating management of the energy storage battery.

[0019] In some of the embodiments, during the process of performing charging and heating management of the energy storage battery, the method further includes:

[0020] Based on the battery management system, the real-time SOC and real-time cell temperature of the energy storage battery are obtained, and the size of the real-time SOC and the SOC threshold is determined. If the real-time SOC is greater than the SOC threshold, a stop power supply request is sent to the inverter controller to stop charging the energy storage battery;

[0021] Then determine whether the real-time battery cell temperature is lower than the first battery cell temperature threshold. If the real-time battery cell temperature is lower than the first battery cell temperature threshold, control the energy storage battery to supply power to the heating device based on the battery management system to maintain the heating operation of the energy storage battery.

[0022] In some of the embodiments, before the step of establishing electrical connections between the energy storage battery and the inverter and the heating device respectively through the battery management system and sending a battery management request to the inverter controller, the method further includes:

[0023] Based on the battery management system, the current cell temperature of the energy storage battery is obtained. If the current cell temperature is lower than the second cell temperature threshold, an electrical connection is established between the heating device and the inverter, and a battery heating management request is sent to the inverter controller; the inverter controller controls the inverter to supply power to the heating device with the working current value as the target power supply current value, so as to realize battery heating management.

[0024] In order to solve the above problems, one aspect of an embodiment of the present invention provides a management system for an energy storage battery, including a battery management system and an inverter controller, wherein:

[0025] A battery management system, configured to, in response to a battery management request, establish electrical connections between the energy storage battery and the inverter and the heating device respectively when the current maximum discharge current value of the energy storage battery is lower than the operating current value of the heating device and the battery cell temperature of the energy storage battery is lower than a first battery cell temperature threshold, and send a battery management request to the inverter controller;

[0026] The inverter controller is used to control the power supply of the inverter so as to charge the energy storage battery and supply power to the heating device to perform charging and heating management of the energy storage battery; wherein, during the power supply control process, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value.

[0027] In order to solve the above problems, one aspect of an embodiment of the present invention provides an energy storage inverter, including an energy storage battery pack, an inverter, and a management system of the above energy storage battery; wherein the energy storage battery pack includes an energy storage battery and a heating device; the energy storage battery in the energy storage inverter is connected to the inverter via a positive power line and a negative power line, and a battery positive switch and a battery negative switch are respectively provided on the power lines, and a heating assembly formed by the heating device and the heating switch in series is respectively connected to the positive power line and the negative power line;

[0028] The battery management system in the management system of the energy storage battery is communicatively connected with the inverter controller.

[0029] In order to solve the above problems, one aspect of an embodiment of the present invention provides a non-transitory machine-readable medium storing computer instructions, where the computer instructions are used to enable a computer to execute any of the above energy storage battery management methods.

[0030] The beneficial effects of the embodiments of the present invention are as follows: when the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device, and the battery cell temperature of the energy storage battery is lower than the first battery cell temperature threshold, the battery management system respectively establishes electrical connections between the energy storage battery and the inverter and the heating device, and sends a battery management request to the inverter controller; the inverter controller responds to the battery management request to control the power supply of the inverter so as to charge the energy storage battery and supply power to the heating device, so as to perform charging and heating management of the energy storage battery; wherein, in the process of power supply control, the working current value is used as the initial power supply current value, and the working current value is used as the heating device. The technical means of using the sum of the maximum charging current value of the energy storage battery as the target power supply current value overcomes the problem that in the related technology, during the heating process of the energy storage battery, in order to ensure the safety of the energy storage battery, the energy storage battery cannot be charged at the same time, which affects the working efficiency of the energy storage battery and limits the application scenarios of the energy storage inverter. It realizes the power supply control of the inverter through the inverter controller to charge the battery while heating the battery, ensures the safety of the battery, improves the working efficiency of the energy storage battery, increases the battery service life, improves the management effect of the energy storage battery, and expands the technical effect of the applicable scenarios of the energy storage battery.

[0031] The details of one or more embodiments of the invention are set forth in the following drawings and description so that other features, objects, and advantages of the invention are more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0033] Figure 1 It is a main flow chart of a method for managing an energy storage battery according to an embodiment of the present invention.

[0034] Figure 2 It is a schematic diagram of the connection between the energy storage battery, the heating device and the inverter according to an embodiment of the present invention. Figure 3 It is a schematic diagram of the connection framework of a photovoltaic panel, an energy storage inverter, and a power grid according to an embodiment of the present invention. Figure 4 It is a circuit connection diagram of a photovoltaic panel, an energy storage inverter, and a power grid according to an embodiment of the present invention. Figure 5 Schematic diagram of a control loop of an inverter controller according to an embodiment of the present invention.

[0035] Figure 6 It is a schematic diagram of the framework of an energy storage battery management system according to an embodiment of the present invention.

[0036] Figure 7 It is a structural schematic diagram of the electronic device of the present invention. DETAILED DESCRIPTION

[0037] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0038] Since the operation of energy storage batteries under low temperature conditions will affect the battery life, most battery manufacturers do not allow the energy storage batteries to be charged and discharged under low temperature conditions. Therefore, when the user's home has a load that needs to be discharged and maintained by the energy storage battery (battery discharge), or the photovoltaic energy matched with the energy storage inverter needs to be stored by the energy storage battery (battery charging), the battery needs to be heated so that the energy storage battery can reach a higher working state to meet the electricity or energy storage needs.

[0039] However, the heating solution for energy storage batteries provided by related technologies cannot simultaneously charge the energy storage batteries during the heating process in order to ensure the safety of the energy storage batteries, which affects the working efficiency of the energy storage batteries and limits the application scenarios of energy storage inverters.

[0040] In order to solve the above problems, an embodiment of the present invention provides a management method for energy storage batteries, such as Figure 1 As shown, the management method of the energy storage battery mainly includes:

[0041] Step S101, when the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device and the cell temperature of the energy storage battery is lower than the first cell temperature threshold, the battery management system establishes electrical connections between the energy storage battery and the inverter and the heating device respectively, and sends a battery management request to the inverter controller.

[0042] The above steps provide specific conditions for starting battery heating and battery charging operations at the same time (i.e., the maximum discharge current value of the energy storage battery is lower than the working current value of the heating device and the battery cell temperature is lower than the set first battery cell temperature threshold). Through the above settings, only when the energy storage battery is at a relatively low temperature and is insufficient to support the normal operation of the heating device, a battery management request including battery heating and battery charging is sent to the inverter, so that the inverter controller controls the inverter to charge the energy storage battery, and at the same time, the heating device is powered to heat the energy storage battery, thereby effectively utilizing energy and improving the energy efficiency of the overall system. At the same time, a reasonable heating and charging strategy helps to keep the battery operating within a healthier temperature range, helps to reduce the battery aging rate, and thus prolongs the battery life. In addition, the battery management system (BMS) automatically determines the start-up conditions and sends instructions to the inverter controller, thereby realizing automatic management of the system, reducing the possibility of human errors, and improving the stability and reliability of the system.

[0043] The first temperature threshold may be any temperature value or temperature range between [-5°C, 5°C]. When the temperature is lower than the first temperature threshold, the energy storage battery cannot be used to supply power to the heating device, and the heating device cannot be used to heat the energy storage battery. However, the energy storage battery can be charged. It is understandable that during the charging process of the energy storage battery, the heat released by the electrochemical reaction will also increase the temperature of the battery cell of the energy storage battery, thereby accelerating the speed at which the temperature of the battery cell of the energy storage battery rises to a temperature that meets the optimal working state.

[0044] It is understandable that if the cell temperature of the energy storage battery is higher than the first temperature threshold, there is no need to heat the energy storage battery. It is only necessary to determine whether battery charging management of the energy storage battery is needed based on the SOC (State of Charge, the ratio of the current remaining capacity of the battery to the capacity of its fully charged state, usually expressed as a percentage) of the energy storage battery.

[0045] Among them, in the energy storage inverter provided by the embodiment of the present invention, the energy storage battery is connected to the inverter via the positive power line and the negative power line, and the power lines are respectively provided with a battery positive switch and a battery negative switch, the energy storage battery and the heating device are both arranged in the energy storage battery pack, and the heating assembly formed by the heating device and the heating switch in series is respectively connected to the positive power line and the negative power line. According to a specific implementation of the embodiment of the present invention, one end of the heating device is connected to the positive power line via the heating switch, and the other end is connected to the negative power line; according to another specific implementation, one end of the heating device is connected to the positive power line, and the other end is connected to the negative power line via the heating switch.

[0046] like Figure 2 As shown, the inverter is connected to the energy storage battery via the positive power line and the negative power line, the positive power line is provided with a positive battery switch S1, the negative power line is provided with a negative power switch S2, one end of the heating device is connected to the positive power line via the heating switch S3, and the other end is connected to the negative power line. When the positive battery switch S1 and the negative battery switch S3 are closed, the electrical connection between the inverter and the energy storage battery is realized; at this time, after closing the heating switch S3, the electrical connection between the heating device and the energy storage battery and the inverter is realized.

[0047] In some of the embodiments, before the step of sending a battery management request to the inverter controller, the method further includes: obtaining the current cell temperature, cell parameters and battery voltage of the energy storage battery based on the battery management system, calculating the current maximum discharge current value corresponding to the energy storage battery according to the current cell temperature and cell parameters, and calculating the working current value corresponding to the heating device according to the battery voltage and the equivalent resistance value of the heating device; comparing the current maximum discharge current value and the working current value, and if the current maximum discharge current value is higher than the working current value, controlling the energy storage battery to supply power to the heating device based on the battery management system to perform heating management of the energy storage battery; if the current maximum discharge current value is lower than the working current value, sending a battery management request to the inverter controller so that the inverter controller controls the power supply to the inverter, thereby performing charging and heating management of the energy storage battery.

[0048] Through the above settings, based on the parameters obtained by the battery management system using temperature sensors, current sensors, voltage sensors, etc., the current maximum discharge current value of the energy storage battery and the working current value of the heating device can be accurately calculated, thereby providing data support for determining whether to supply power to the heating device through the energy storage battery to heat the energy storage battery or to supply power to the energy storage battery and the heating device simultaneously through the inverter. Precise current and temperature management, as well as intelligent decision-making, reduce the safety risks during battery heating and battery charging, and also help to maintain the battery performance and extend the battery service life.

[0049] According to a specific embodiment of the present invention, the battery management system (BMS) detects the cell temperature, and calculates the maximum allowable charge and discharge current values of the cell at the current temperature according to the cell temperature and the cell charge and discharge specifications. Define the maximum charge current value as I_charge_max and the maximum discharge current value as I_discharge_max. The working current value of the heating device is defined as I_heat, the equivalent resistance value of the heating device is defined as R_heat, and the battery voltage value is defined as U_bat. Among them, the equivalent resistance value R_heat of the heating device is a known quantity, and the battery voltage value U_bat can be obtained in real time by the BMS through the sampling circuit. Therefore, the working current value of the heating device I_heat = U_bat / R_heat can be calculated in real time.

[0050] When I_discharge_max < I_heat, it means that the maximum discharge current of the battery at the current cell temperature is not enough to supply power for battery heating, and at this time, power supply through the inverter is required. Or, when the remaining battery power (SOC) of the energy storage battery is detected to be low, or the current cell temperature is low, such as lower than the first cell temperature threshold, it indicates that if the energy for battery heating is provided by the energy storage battery at this time, the SOC of the energy storage battery will decrease, and even after the battery heating ends, the remaining battery energy will not be enough for user use. At this time, a battery heating request is sent to the inverter control to supply power to the heating device through the inverter. When I_discharge_max > I_heat, it means that the current required by the heating device can be provided by the energy storage battery. At this time, if the battery needs to be heated and is permitted, the battery management system controls S1, S2, and S3 to close, and controls the energy storage battery to supply power to the heating device to achieve battery heating.

[0051] In some of the embodiments, during the process of executing charging and heating management of the energy storage battery, the above method also includes: obtaining the real-time SOC and real-time battery cell temperature of the energy storage battery based on the battery management system, judging the size of the real-time SOC and the SOC threshold, if the real-time SOC is greater than the SOC threshold, sending a power supply stop request to the inverter controller to stop the charging operation of the energy storage battery; then judging whether the real-time battery cell temperature is lower than the first battery cell temperature threshold, if the real-time battery cell temperature is lower than the first battery cell temperature threshold, controlling the energy storage battery to supply power to the heating device based on the battery management system to maintain the heating operation of the energy storage battery.

[0052] By monitoring the real-time SOC of the battery and stopping charging when the SOC reaches a preset threshold, the battery can be effectively prevented from overcharging, the battery can be protected from damage, and the battery life can be extended. Continuously monitoring the real-time battery cell temperature and continuing the heating operation when the temperature is lower than the first battery cell temperature threshold ensures that the battery operates within an appropriate temperature range, which is conducive to maintaining the optimal performance of the battery. Through the above settings, combined with the dual control of SOC and temperature, it can be ensured that the energy storage battery stops charging after it is charged to a certain level, and heating is maintained as needed (to ensure battery performance and prepare for subsequent energy storage battery discharge), which not only ensures the safety of the battery (avoiding safety hazards caused by overcharging or overheating), but also maximizes energy utilization efficiency.

[0053] In some of the embodiments, before the steps of respectively establishing electrical connections between the energy storage battery and the inverter and the heating device through the battery management system and sending a battery management request to the inverter controller, the method further includes: obtaining the current cell temperature of the energy storage battery based on the battery management system, and if the current cell temperature is lower than the second cell temperature threshold, establishing an electrical connection between the heating device and the inverter, and sending a battery heating management request to the inverter controller; controlling the inverter through the inverter controller to supply power to the heating device with the working current value as the target power supply current value, so as to realize battery heating management.

[0054] The second cell temperature threshold provided in the embodiment of the present invention is lower than the first temperature threshold, which refers to the critical temperature range in which the energy storage battery cannot perform a discharge operation or a discharge operation. According to a specific implementation of the embodiment of the present invention, the second cell temperature threshold may be in the range of [-15°C, -5°C].

[0055] If the cell temperature of the energy storage battery is lower than the second temperature threshold, it does not matter whether the battery SOC is sufficient or whether the battery needs to be charged or discharged later. It is only necessary to establish an electrical connection between the inverter and the heating device and power the heating device through the inverter to heat the battery. During the heating process, when the cell temperature of the energy storage battery is not lower than the second temperature threshold, it is determined whether to discharge or charge the energy storage battery in combination with the battery SOC, load demand, and other conditions.

[0056] Through the above settings, the battery is ensured to work within a suitable temperature range, which helps to improve the performance of the battery and extend the battery life. When the battery temperature is too low, the electrical connection between the heating device and the inverter is automatically established, and a battery heating management request is sent, which ensures that the system can respond to changes in battery temperature in a timely manner and improves the intelligence level of the system. By controlling the inverter to supply power to the heating device with the working current value as the target power supply current value through the inverter controller, it can ensure battery heating while reasonably utilizing energy and avoiding unnecessary energy waste.

[0057] Step S102, controlling the inverter to supply power in response to the battery management request through the inverter controller so as to charge the energy storage battery and supply power to the heating device, so as to perform charging and heating management of the energy storage battery; wherein, in the process of power supply control, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value.

[0058] Based on the above settings, the inverter controller controls the inverter power supply, while charging the energy storage battery and supplying power to the heating device, achieving effective use of energy and improving the overall energy efficiency of the system. In the power supply control process, the working current value of the heating device is used as the initial power supply current value, and the working current value plus the maximum charging current value of the energy storage battery is used as the target power supply current value, ensuring precise control during the power supply process. Precise power supply current value control ensures the safety of the battery during the charging process and avoids battery overheating or other safety issues caused by excessive charging current.

[0059] According to an embodiment of the present invention, Figure 5 FIG. 1 is a control loop diagram of an inverter controller according to an embodiment of the present invention. Figure 5As shown, the inverter controller sets a target power supply current value I_charge according to system requirements; the actual current value I_bat of the energy storage battery is measured in real time through the current sensor; the controller calculates the difference between the target power supply current value I_charge and the actual current value I_bat, that is, the error E = I_charge-I_bat; according to the calculated error E, the controller uses an appropriate control algorithm (such as PID control) to calculate the control signal, which is usually the duty cycle d of the PWM (pulse width modulation) signal; the controller generates a PWM signal, whose duty cycle d is calculated according to the control algorithm; the PWM signal is used to control the opening and closing of the power electronic switch (such as MOSFET or IGBT), thereby controlling the current I_bat passing through the battery. The measured current value I_bat is fed back to the controller to form a closed-loop control system, thereby realizing the power supply control of the inverter.

[0060] In some of the embodiments, before the step of controlling the power supply of the inverter through the inverter controller to charge the energy storage battery and supply power to the heating device, the method further includes: obtaining the working parameters of the inverter based on the inverter controller, and judging whether the power supply conditions are met based on the working parameters; if so, charging the energy storage battery and supplying power to the heating device.

[0061] Through the above settings, the inverter determines whether it meets the normal working conditions. If it can work normally, it replies to the battery to allow heating. If the inverter cannot work normally due to a fault or external conditions, it replies to the battery to refuse heating. Specifically, the inverter's working parameters are obtained through the inverter controller, and based on these parameters, it is determined whether the power supply conditions are met, ensuring that the charging and heating processes are started under appropriate conditions, thereby improving the safety and stability of the system. And before performing charging and heating management, checking the working status of the inverter can avoid problems caused by inverter failure or inappropriate working parameters, such as overload or low efficiency.

[0062] in, Figure 3 It is a schematic diagram of the connection framework of a photovoltaic panel, an energy storage inverter, and a power grid according to an embodiment of the present invention. Figure 4 FIG. 1 is a schematic diagram of the circuit connection of a photovoltaic panel, an energy storage inverter, and a power grid according to an embodiment of the present invention. Figure 3 and Figure 4 As shown, the inverter can determine whether the power supply conditions are met based on the following situations: whether the inverter itself is faulty, whether the photovoltaic panel can provide sufficient power, whether the power grid can provide sufficient power, etc.

[0063] In some of the embodiments, during the process of executing charging and heating management of the energy storage battery, the method further includes: obtaining the real-time cell temperature of the energy storage battery based on the battery management system, and when the real-time cell temperature is higher than a first cell temperature threshold, disconnecting the electrical connection between the energy storage battery and the heating device.

[0064] The battery management system monitors the cell temperature of the energy storage battery in real time to ensure that the battery operates within an appropriate temperature range. Once the cell temperature exceeds the first cell temperature threshold, the system will automatically disconnect the electrical connection between the energy storage battery and the heating device, avoiding safety hazards caused by overheating. It also helps to reduce unnecessary energy consumption and improve the overall energy efficiency of the system.

[0065] In some of the embodiments, during the process of performing charging and heating management of the energy storage battery, the above method also includes: obtaining a real-time charging current value of the energy storage battery based on a battery management system, and if the real-time charging current value is greater than the maximum charging current value, sending a target power supply current value adjustment request to the inverter controller, so that the inverter controller adjusts the target power supply current value.

[0066] The battery management system monitors the charging current value of the energy storage battery in real time. When the real-time charging current value approaches or exceeds the maximum charging current value, the system automatically sends a target power supply current value adjustment request to the inverter controller, avoiding safety hazards caused by excessive charging current, thereby protecting the battery from overcharging damage.

[0067] The above-mentioned energy storage battery management method provided by the embodiment of the present invention adopts the method that when the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device and the battery cell temperature of the energy storage battery is lower than the first battery cell temperature threshold, the battery management system respectively establishes electrical connections between the energy storage battery and the inverter and the heating device, and sends a battery management request to the inverter controller; the inverter controller controls the power supply of the inverter in response to the battery management request, thereby charging the energy storage battery and supplying power to the heating device, so as to perform charging and heating management of the energy storage battery; wherein, in the process of power supply control, the working current value is used as the initial power supply current value, and the heating device is used as the heating device. The technical means of using the sum of the working current value and the maximum charging current value of the energy storage battery as the target power supply current value overcomes the problem in the related technology that during the heating process of the energy storage battery, in order to ensure the safety of the energy storage battery, the energy storage battery cannot be charged at the same time, which affects the working efficiency of the energy storage battery and limits the application scenarios of the energy storage inverter. It realizes the power supply control of the inverter through the inverter controller to charge the battery while heating the battery, ensures the safety of the battery, improves the working efficiency of the energy storage battery, increases the battery service life, improves the management effect of the energy storage battery, and expands the technical effect of the applicable scenarios of the energy storage battery.

[0068] Based on the above energy storage battery management method provided in the embodiment of the present invention, the embodiment of the present invention also provides an energy storage battery management system, which is applied to the management of energy storage batteries in energy storage inverters, such as Figure 6 As shown, the energy storage battery management system 600 includes: a battery management system 601 and an inverter controller 602, wherein:

[0069] The battery management system 601 is used to establish electrical connections between the energy storage battery and the inverter and the heating device respectively when the current maximum discharge current value of the energy storage battery is lower than the operating current value of the heating device and the cell temperature of the energy storage battery is lower than the first cell temperature threshold, and send a battery management request to the inverter controller.

[0070] Through the above settings, only when the energy storage battery is at a low temperature and is insufficient to support the normal operation of the heating device, a battery management request including battery heating and battery charging is sent to the inverter, so that the inverter controller controls the inverter to charge the energy storage battery, and at the same time, the heating device is powered to heat the energy storage battery, thereby effectively utilizing energy and improving the energy efficiency of the overall system. At the same time, a reasonable heating and charging strategy helps to keep the battery operating in a healthier temperature range, helps to reduce the battery aging rate, and thus prolongs the battery life.

[0071] Among them, in the energy storage inverter provided by the embodiment of the present invention, the energy storage battery is connected to the inverter via the positive power line and the negative power line, and the power lines are respectively provided with a battery positive switch and a battery negative switch, the energy storage battery and the heating device are both arranged in the energy storage battery pack, and the heating assembly formed by the heating device and the heating switch in series is respectively connected to the positive power line and the negative power line. According to a specific implementation of the embodiment of the present invention, one end of the heating device is connected to the positive power line via the heating switch, and the other end is connected to the negative power line; according to another specific implementation, one end of the heating device is connected to the positive power line, and the other end is connected to the negative power line via the heating switch.

[0072] In some of the embodiments, before the step of sending a battery management request to the inverter controller, the battery management system 601 is further used to: obtain the current cell temperature, cell parameters and battery voltage of the energy storage battery, calculate the current maximum discharge current value corresponding to the energy storage battery according to the current cell temperature and cell parameters, and calculate the working current value corresponding to the heating device according to the battery voltage and the equivalent resistance value of the heating device; compare the current maximum discharge current value and the working current value, and if the current maximum discharge current value is higher than the working current value, control the energy storage battery to supply power to the heating device to perform heating management of the energy storage battery; if the current maximum discharge current value is lower than the working current value, send a battery management request to the inverter controller so that the inverter controller controls the power supply to the inverter, thereby performing charging and heating management of the energy storage battery.

[0073] Through the above settings, based on the parameters obtained by the battery management system using temperature sensors, current sensors, voltage sensors, etc., the current maximum discharge current value of the energy storage battery and the working current value of the heating device can be accurately calculated, thereby providing data support for determining whether to power the heating device through the energy storage battery to achieve heating of the energy storage battery, or to charge the energy storage battery and power the heating device through the inverter at the same time. Accurate current and temperature management, as well as intelligent decision-making reduce safety risks in the process of battery heating and battery charging, and also help maintain battery performance and extend battery life.

[0074] In some of the embodiments, in the process of executing charging and heating management of the energy storage battery, the above-mentioned battery management system 601 is also used to: obtain the real-time SOC and real-time battery cell temperature of the energy storage battery, determine the size of the real-time SOC and the SOC threshold, if the real-time SOC is greater than the SOC threshold, send a stop power supply request to the inverter controller to stop the charging operation of the energy storage battery; then determine whether the real-time battery cell temperature is lower than the first battery cell temperature threshold, if the real-time battery cell temperature is lower than the first battery cell temperature threshold, control the energy storage battery to supply power to the heating device to maintain the heating operation of the energy storage battery.

[0075] Through the above settings, combined with the dual control of SOC and temperature, it can be ensured that the energy storage battery stops charging after being charged to a certain level, while maintaining heating as needed (to ensure battery performance and prepare for subsequent energy storage battery discharge), which not only ensures the safety of the battery (avoiding safety hazards caused by overcharging or overheating) but also maximizes energy utilization efficiency.

[0076] In some of the embodiments, before the steps of respectively establishing electrical connections between the energy storage battery and the inverter and the heating device through the battery management system and sending a battery management request to the inverter controller, the battery management system 601 is also used to: obtain the current cell temperature of the energy storage battery, if the current cell temperature is lower than the second cell temperature threshold, establish an electrical connection between the heating device and the inverter, and send a battery heating management request to the inverter controller; control the inverter through the inverter controller to supply power to the heating device with the working current value as the target power supply current value, so as to realize battery heating management.

[0077] The above settings ensure that the battery operates within a suitable temperature range, which helps to improve battery performance and extend battery life. When the battery temperature is too low, the electrical connection between the heating device and the inverter is automatically established, and a battery heating management request is sent, which ensures that the system can respond to changes in battery temperature in a timely manner and improves the intelligence level of the system.

[0078] The inverter controller 602 is used to control the power supply of the inverter in response to the battery management request so as to charge the energy storage battery and supply power to the heating device to perform charging and heating management of the energy storage battery; wherein, in the power supply control process, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value.

[0079] Based on the above settings, the inverter controller controls the inverter power supply, while charging the energy storage battery and supplying power to the heating device, thereby achieving effective utilization of energy and improving the overall energy efficiency of the system.

[0080] In some of the embodiments, before the step of controlling the power supply of the inverter through the inverter controller to charge the energy storage battery and supply power to the heating device, the inverter controller 602 is also used to: obtain the working parameters of the inverter, and determine whether the power supply conditions are met based on the working parameters; if met, then execute the operation of charging the energy storage battery and supplying power to the heating device.

[0081] The inverter controller obtains the inverter's operating parameters and determines whether the power supply conditions are met based on these parameters, ensuring that the charging and heating processes are started under appropriate conditions, improving the safety and stability of the system. Before charging and heating management, checking the inverter's operating status can avoid problems caused by inverter failure or inappropriate operating parameters, such as overload or low efficiency.

[0082] In some of the embodiments, during the process of executing charging and heating management of the energy storage battery, the battery management system 601 is also used to: obtain the real-time battery cell temperature of the energy storage battery, and when the real-time battery cell temperature is higher than the first battery cell temperature threshold, disconnect the electrical connection between the energy storage battery and the heating device.

[0083] Once the battery cell temperature exceeds the first battery cell temperature threshold, the system will automatically disconnect the electrical connection between the energy storage battery and the heating device, thereby avoiding safety hazards caused by overheating, and helping to reduce unnecessary energy consumption and improve the overall energy efficiency of the system. In some of the embodiments, in the process of performing charging and heating management of the energy storage battery, the battery management system 601 is also used to: obtain the real-time charging current value of the energy storage battery, and if the real-time charging current value is greater than the maximum charging current value, send a target power supply current value adjustment request to the inverter controller so that the inverter controller adjusts the target power supply current value.

[0084] The battery management system monitors the charging current value of the energy storage battery in real time. When the real-time charging current value approaches or exceeds the maximum charging current value, the system automatically sends a target power supply current value adjustment request to the inverter controller, avoiding safety hazards caused by excessive charging current, thereby protecting the battery from overcharging damage.

[0085] The management system of the energy storage battery provided in the embodiment of the present invention is a battery management system, which is used to establish electrical connections between the energy storage battery and the inverter and the heating device respectively when the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device and the battery cell temperature of the energy storage battery is lower than the first battery cell temperature threshold, and send a battery management request to the inverter controller; the inverter controller is used to control the power supply of the inverter to charge the energy storage battery and supply power to the heating device to perform charging and heating management of the energy storage battery; wherein, in the power supply control process, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value. The present invention overcomes the problem in the related art that, during the heating process of the energy storage battery, in order to ensure the safety of the energy storage battery, the energy storage battery cannot be charged at the same time, which affects the working efficiency of the energy storage battery and limits the application scenarios of the energy storage inverter. The present invention realizes the charging of the battery while heating the battery by controlling the power supply of the inverter through the inverter controller, thereby ensuring the safety of the battery, improving the working efficiency of the energy storage battery, increasing the battery service life, improving the management effect of the energy storage battery, and expanding the technical effect of the applicable scenarios of the energy storage battery.

[0086] In order to solve the above problems, one aspect of an embodiment of the present invention further provides an energy storage inverter, including an energy storage battery pack, an inverter and a management system of the above energy storage battery; wherein the energy storage battery pack includes an energy storage battery and a heating device; the energy storage battery in the energy storage inverter is connected to the inverter via a positive power line and a negative power line, and a battery positive switch and a battery negative switch are respectively provided on the power lines, and a heating assembly formed by the heating device and the heating switch connected in series is respectively connected to the positive power line and the negative power line; the battery management system in the management system of the energy storage battery is communicatively connected to the inverter controller.

[0087] In some of the embodiments, the energy storage battery pack also includes a heat preservation device, which is used to maintain the temperature of the energy storage battery within an appropriate range, thereby avoiding situations such as reduced battery efficiency, slower charging efficiency, and shortened battery life caused by excessively high or low battery temperature.

[0088] An embodiment of the present invention further provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to cause the computer to execute the method of the embodiment of the present invention.

[0089] The embodiment of the present invention further provides a computer program product, including a computer program, wherein the computer program is used to make the computer perform the method of the embodiment of the present invention when executed by a processor of the computer. The computer program product should be understood as a software product that mainly implements the above method of the present application through a computer program.

[0090] An embodiment of the present invention further provides an electronic device, comprising: at least one processor; and a memory in communication with the at least one processor. The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the electronic device executes the method of the embodiment of the present invention.

[0091] refer to Figure 7 , a block diagram of an electronic device that can be used as a server or client of an embodiment of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0092] like Figure 7 As shown, the electronic device includes a computing unit 701, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 702 or a computer program loaded from a storage unit 708 into a random access memory (RAM) 703. In the RAM 703, various programs and data required for the operation of the electronic device can also be stored. The computing unit 701, the ROM 702, and the RAM 703 are connected to each other via a bus 704. An input / output (I / O) interface 705 is also connected to the bus 704.

[0093] Multiple components in the electronic device are connected to the I / O interface 705, including: an input unit 706, an output unit 707, a storage unit 708, and a communication unit 709. The input unit 706 can be any type of device that can input information to the electronic device, and the input unit 706 can receive input digital or character information, and generate key signal input related to user settings and / or function control of the electronic device. The output unit 707 can be any type of device that can present information, and can include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 708 can include but is not limited to a disk, an optical disk. The communication unit 709 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include but is not limited to a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0094] The computing unit 701 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 701 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 701 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 708. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via a ROM 702 and / or a communication unit 709. In some embodiments, the computing unit 701 may be configured to perform the above-described method in any other appropriate manner (e.g., by means of firmware).

[0095] The computer programs for implementing the methods of the embodiments of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer programs are executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer programs may be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0096] In the context of an embodiment of the present invention, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, or infrared systems, devices, or equipment, or any suitable combination of the foregoing. More specific examples of machine-readable storage media may include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0097] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0098] The various steps described in the method implementation methods provided in the embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method implementation methods may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0099] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0100] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A method for managing an energy storage battery, characterized in that: include: When the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device, and the battery cell temperature of the energy storage battery is lower than the first battery cell temperature threshold, the battery management system establishes electrical connections between the energy storage battery and the inverter and the heating device, respectively, and sends a battery management request to the inverter controller; The inverter controller controls the inverter for power supply in response to the battery management request, thereby charging the energy storage battery and supplying power to the heating device, so as to perform charging and heating management of the energy storage battery; wherein, in the power supply control process, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value.

2. The method according to claim 1, characterized in that In the process of executing the charging and heating management of the energy storage battery, the method further includes: The real-time cell temperature of the energy storage battery is obtained based on the battery management system, and when the real-time cell temperature is higher than the first cell temperature threshold, the electrical connection between the energy storage battery and the heating device is disconnected; wherein, the energy storage battery in the energy storage inverter is connected to the inverter via a positive power line and a negative power line, and a battery positive switch and a battery negative switch are respectively provided on the power lines, the energy storage battery and the heating device are both arranged in an energy storage battery pack, and a heating assembly formed by the heating device and the heating switch connected in series is respectively connected to the positive power line and the negative power line.

3. The method according to claim 1, characterized in that In the process of executing the charging and heating management of the energy storage battery, the method further includes: Based on the battery management system, a real-time charging current value of the energy storage battery is obtained. If the real-time charging current value is greater than the maximum charging current value, a target power supply current value adjustment request is sent to the inverter controller so that the inverter controller adjusts the target power supply current value.

4. The method according to claim 1, characterized in that: Before the step of controlling the inverter to supply power through the inverter controller so as to charge the energy storage battery and supply power to the heating device, the method further includes: The inverter controller obtains the working parameters of the inverter, and determines whether the power supply conditions are met based on the working parameters; if met, the energy storage battery is charged and the heating device is supplied with power.

5. The method according to claim 1, characterized in that Before the step of sending a battery management request to the inverter controller, the method further includes: Based on the battery management system, the current cell temperature, cell parameters and battery voltage of the energy storage battery are acquired, the current maximum discharge current value corresponding to the energy storage battery is calculated according to the current cell temperature and the cell parameters, and the working current value corresponding to the heating device is calculated according to the battery voltage and the equivalent resistance value of the heating device; Compare the current maximum discharge current value and the working current value. If the current maximum discharge current value is higher than the working current value, control the energy storage battery to supply power to the heating device based on the battery management system to perform heating management of the energy storage battery; if the current maximum discharge current value is lower than the working current value, send the battery management request to the inverter controller so that the inverter controller controls the power supply to the inverter, thereby performing charging and heating management of the energy storage battery.

6. The method according to claim 1, characterized in that In the process of executing the charging and heating management of the energy storage battery, the method further includes: Based on the battery management system, the real-time SOC and the real-time cell temperature of the energy storage battery are obtained, and the size of the real-time SOC and the SOC threshold is determined. If the real-time SOC is greater than the SOC threshold, a stop power supply request is sent to the inverter controller to stop the charging operation of the energy storage battery; Then determine whether the real-time battery cell temperature is lower than the first battery cell temperature threshold. If the real-time battery cell temperature is lower than the first battery cell temperature threshold, control the energy storage battery to supply power to the heating device based on the battery management system to maintain the heating operation of the energy storage battery.

7. The method according to claim 1, characterized in that Before the step of establishing electrical connections between the energy storage battery and the inverter and the heating device respectively through the battery management system and sending a battery management request to the inverter controller, the method further includes: Acquiring the current cell temperature of the energy storage battery based on the battery management system, if the current cell temperature is lower than a second cell temperature threshold, establishing an electrical connection between the heating device and the inverter, and sending a battery heating management request to the inverter controller; The inverter controller controls the inverter to supply power to the heating device with the working current value as the target power supply current value, so as to achieve battery heating management.

8. A management system for energy storage batteries, characterized in that: It includes a battery management system and an inverter controller, among which: The battery management system is used to establish electrical connections between the energy storage battery and the inverter and the heating device respectively, and send a battery management request to the inverter controller when the current maximum discharge current value of the energy storage battery is lower than the working current value of the heating device and the battery cell temperature of the energy storage battery is lower than the first battery cell temperature threshold; The inverter controller is used to control the power supply of the inverter in response to the battery management request so as to charge the energy storage battery and supply power to the heating device, so as to perform charging and heating management of the energy storage battery; wherein, during the power supply control process, the working current value is used as the initial power supply current value, and the sum of the working current value and the maximum charging current value of the energy storage battery is used as the target power supply current value.

9. An energy storage inverter, characterized in that: A management system for an energy storage battery comprising an energy storage battery pack, an inverter, and the energy storage battery according to claim 8; wherein the energy storage battery pack comprises an energy storage battery and a heating device; the energy storage battery in the energy storage inverter is connected to the inverter via a positive power line and a negative power line, and a battery positive switch and a battery negative switch are respectively provided on the power lines, and a heating assembly formed by the heating device and the heating switch in series is respectively connected to the positive power line and the negative power line; The battery management system in the management system of the energy storage battery is communicatively connected with the inverter controller.

10. A non-transitory machine-readable medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the method according to any one of claims 1-7.

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