Energy storage system, battery control method and device thereof, equipment and medium

Abstract

The invention provides an energy storage system, a battery control method and device thereof, equipment and a medium, and belongs to the technical field of batteries. The energy storage system comprises a conversion circuit and an energy storage battery, the conversion circuit is connected with the energy storage battery, the energy storage battery discharges to external equipment through the conversion circuit, and the method comprises the steps that the battery temperature of the energy storage battery is obtained; and heating the energy storage battery in response to the condition that the battery temperature is less than the preset temperature. According to the method provided by the embodiment of the invention, the energy storage battery can be heated, and the working performance of the energy storage battery is ensured.

Description

Energy storage system and battery control method, device, equipment and medium thereof Technical Field

[0001] The present application relates to the field of battery technology, and in particular to an energy storage system and its battery control method, device, equipment and medium. Background Art

[0002] Energy storage batteries generally include batteries used for solar power generation equipment, wind power generation equipment, and renewable energy storage, and can be used to regulate voltage to ensure that the system operates in the best working condition.

[0003] However, the characteristics of energy storage batteries are greatly affected by temperature, and working in a low-temperature environment will affect the performance of energy storage batteries.

[0004] Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one object of the present application is to provide an energy storage system and its battery control method, device, equipment and medium to achieve heating of the energy storage battery and ensure the performance of the energy storage battery.

[0006] An embodiment of the first aspect of the present application provides a battery control method for an energy storage system, wherein the energy storage system includes a conversion circuit and an energy storage battery, the conversion circuit is connected to the energy storage battery, and the energy storage battery discharges to an external device through the conversion circuit. The method includes: obtaining a battery temperature of the energy storage battery; and heating the energy storage battery in response to the battery temperature being less than a preset temperature.

[0007] In the technical solution of the embodiment of the present application, the energy storage battery is heated when the battery temperature of the energy storage battery is lower than a preset temperature to ensure the working performance of the energy storage battery.

[0008] In some embodiments, heating the energy storage battery includes at least one of the following heating strategies: controlling the energy storage battery to alternately charge and discharge via a conversion circuit; controlling the energy storage battery to charge via the conversion circuit; and controlling the energy storage battery to discharge via the conversion circuit. Heating the energy storage battery by charging or discharging the energy storage battery is more convenient and quick.

[0009] In some embodiments, the conversion circuit includes a capacitor, wherein controlling the energy storage battery to discharge through the conversion circuit includes controlling the energy storage battery to discharge into the capacitor, and wherein controlling the energy storage battery to charge through the conversion circuit includes controlling the capacitor to charge the energy storage battery. The capacitor can be both charged and discharged, thereby facilitating charging and discharging of the energy storage battery through the capacitor.

[0010] In some embodiments, the conversion circuit includes a DC bus, and capacitors are disposed on the DC bus, reusing the DC bus capacitors for a simpler structure. Capacitors are inherent components in energy storage systems, and using capacitors to charge or discharge the energy storage battery eliminates the need for other components, increasing convenience and simplifying the energy storage system structure.

[0011] In some embodiments, the conversion circuit includes a DC-AC conversion circuit, a DC bus connected to the DC terminal of the DC-AC conversion circuit, and an AC terminal of the DC-AC conversion circuit connected to an external device. Directly utilizing the DC bus connected to the DC-AC conversion circuit to charge or discharge the energy storage battery for heating the energy storage battery is more convenient, eliminating the need for additional components.

[0012] In some embodiments, the conversion circuit includes a DC-DC conversion circuit, a DC bus is connected to a bus terminal of the DC-DC conversion circuit, and a battery terminal of the DC-DC conversion circuit is connected to an energy storage battery. Directly utilizing the DC bus connected to the DC-DC conversion circuit is more convenient, eliminating the need for additional components.

[0013] In some embodiments, controlling the energy storage battery to discharge through the conversion circuit includes controlling the energy storage battery to discharge to an external device through the conversion circuit, and controlling the energy storage battery to charge through the conversion circuit includes controlling the external device to charge the energy storage battery through the conversion circuit. The external device is, for example, a device connected to the energy storage system. Using the external device to charge or discharge the energy storage battery eliminates the need for other components in the energy storage system, making charging or discharging the energy storage battery more convenient.

[0014] In some embodiments, the conversion circuit includes a DC-AC conversion circuit, the external device is a power grid, and the DC-AC conversion circuit is connected to the power grid. The DC-AC conversion circuit converts the direct current (DC) power delivered by the power generation unit into alternating current (AC) power for use in the power grid, allowing the entire energy storage system to supply power to the grid, thereby achieving the energy storage system's power generation function.

[0015] In some embodiments, before heating the energy storage battery, the method further includes obtaining the battery voltage of the energy storage battery. The heating of the energy storage battery includes heating the energy storage battery when the battery voltage is greater than a preset battery voltage. Before charging or discharging the energy storage battery, the battery voltage of the energy storage battery is obtained, and the battery voltage is used to determine whether the energy storage battery is suitable for charging or discharging. When the battery voltage is greater than the preset battery voltage, charging or discharging the energy storage battery is performed to avoid discharging the energy storage battery even when the battery voltage is too low, which could affect the safety of the energy storage battery.

[0016] In some embodiments, before heating the energy storage battery, the method further includes: obtaining the state of charge of the energy storage battery, wherein heating the energy storage battery includes: performing an operation of heating the energy storage battery when the state of charge is greater than a preset state of charge. Before charging or discharging the energy storage battery, the state of charge of the energy storage battery is obtained, and the suitability of the energy storage battery for charging or discharging is determined based on the state of charge. When the state of charge is greater than the preset state of charge, the energy storage battery is charged or discharged, thereby avoiding the situation where discharging the energy storage battery when the state of charge is too low may affect the safety performance of the energy storage battery.

[0017] In some embodiments, the method further includes: obtaining operating status information of the energy storage battery during heating of the energy storage battery; and adjusting operating parameters for heating the energy storage battery based on the operating status information. During heating of the energy storage battery, the operating status information of the energy storage battery is obtained, and the operating parameters for heating the energy storage battery are adjusted based on the operating status information, so that the operating parameters of the energy storage battery during charging or discharging always meet preset conditions, thereby ensuring the heating speed of the energy storage battery and improving heating efficiency.

[0018] In some embodiments, obtaining the working status information of the energy storage battery includes: obtaining the current working current of the energy storage battery when it is charged or discharged through a conversion circuit. Adjusting the working parameters for heating the energy storage battery based on the working status information includes: adjusting the working parameters for heating the energy storage battery based on the current working current and preset conditions. During the heating of the energy storage battery, the working current of the energy storage battery when it is charged or discharged through the conversion circuit is obtained. When the working current does not meet the preset conditions, the working current of the energy storage battery when it is charged or discharged through the conversion circuit is adjusted so that the working current of the energy storage battery during the charging or discharging process always meets the preset conditions. Since the working current of the energy storage battery during the charging or discharging process affects the heating speed of the energy storage battery, adjusting the working current during charging and discharging can ensure the heating speed of the energy storage battery and improve the heating efficiency.

[0019] In some embodiments, the conversion circuit includes a current sensor configured to detect an operating current of the energy storage battery. Obtaining the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit includes: obtaining, through the current sensor, the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit. Using the current sensor can conveniently obtain the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit.

[0020] In some embodiments, the preset condition includes a preset reference voltage, wherein adjusting the operating parameters of the energy storage battery based on the operating status information includes: obtaining the current operating voltage of the energy storage battery when charging or discharging through the conversion circuit based on the current operating current; and adjusting the operating current of the energy storage battery when charging or discharging through the conversion circuit based on the current operating voltage and the preset reference voltage. The operating current and operating voltage of the energy storage battery have a corresponding relationship, and a corresponding operating voltage can be determined based on the operating current. Then, based on the relationship between the operating voltage and the preset reference voltage, it is determined whether the operating current of the energy storage battery when charging or discharging through the conversion circuit meets the preset condition.

[0021] In some embodiments, adjusting the operating current of the energy storage battery when it is charged or discharged through the conversion circuit based on the current operating voltage and a preset reference voltage includes reducing the operating current of the energy storage battery when it is charged or discharged through the conversion circuit in response to the operating voltage being greater than the preset reference voltage. When the operating current of the energy storage battery is greater than the preset reference voltage, it indicates that the operating current is too high, which may affect the safety performance of the system. Reducing the operating current ensures the safety performance of the energy storage system.

[0022] In some embodiments, adjusting the operating current of the energy storage battery during alternating charging and discharging via the conversion circuit based on the operating voltage and a preset reference voltage includes increasing the operating current of the energy storage battery during charging or discharging via the conversion circuit in response to the operating voltage being less than the preset reference voltage. If the operating current of the energy storage battery is less than the preset reference voltage, it indicates that the operating current is too low, affecting heating efficiency, and the operating current is increased to ensure heating efficiency.

[0023] An embodiment of the second aspect of the present application provides a battery control device for an energy storage system, comprising: a first acquisition module configured to acquire a battery temperature of an energy storage battery; and a control module configured to heat the energy storage battery in response to the battery temperature being lower than a preset temperature.

[0024] An embodiment of the third aspect of the present application provides an energy storage system, including a conversion circuit, an energy storage battery and the battery control device in the above embodiment, the conversion circuit is connected to the energy storage battery, and the energy storage battery discharges to an external device through the conversion circuit.

[0025] An embodiment of the fourth aspect of the present application provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method in the above embodiment.

[0026] An embodiment of the fifth aspect of the present application provides a computer-readable storage medium storing a computer program, which implements the method in the above embodiment when executed by a processor.

[0027] An embodiment of the sixth aspect of the present application provides a computer program product, including a computer program, which implements the method in the above embodiment when executed by a processor.

[0028] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar components or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0030] FIG1 is a simplified structural diagram of an energy storage system provided in an embodiment of the present application;

[0031] FIG2 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0032] FIG3 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0033] FIG4 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0034] FIG5 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0035] FIG6 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0036] FIG7 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0037] FIG8 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0038] FIG9 is a circuit diagram of a DCDC control board provided in an embodiment of the present application;

[0039] FIG10 is a waveform diagram of a working current provided in an embodiment of the present application;

[0040] FIG11 is a waveform diagram of another operating current provided in an embodiment of the present application;

[0041] FIG12 is a block diagram of an energy storage system provided in an embodiment of the present application;

[0042] FIG13 is a block diagram of a battery control device for an energy storage system provided by an embodiment of the present application;

[0043] FIG14 is a block diagram of a battery control device for an energy storage system provided by an embodiment of the present application;

[0044] FIG15 is a block diagram of a battery control device for an energy storage system provided by an embodiment of the present application;

[0045] FIG16 is a block diagram of a battery control device for an energy storage system provided by an embodiment of the present application;

[0046] FIG17 is a block diagram of a battery control device for an energy storage system provided by an embodiment of the present application;

[0047] FIG18 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application;

[0048] FIG19 is a flow chart of another battery control method for an energy storage system provided in an embodiment of the present application.

[0049] Description of reference numerals:

[0050] 1. Conversion circuit; 2. Energy storage battery; 3. External device; 4. Power generation unit; 5. Power conversion unit; 6. Three-phase contactor; 7. Converter; 11. DC-AC conversion circuit; 12. DCDC conversion circuit; 13. Current sensor; 122. DCDC control board; 1221. Central processing unit; 1222. Controllable power supply chip; 1223. Differential amplifier; 1224. Follower; 401. First acquisition module; 402. Control module; 403. Second acquisition module; 404. Adjustment module; 405. Third acquisition module; 406. Fourth acquisition module; 421. First control unit; 422. Second control unit; 423. Third control unit; 424. Fourth control unit; 441. Acquisition unit; 442. Adjustment unit. DETAILED DESCRIPTION

[0051] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0053] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0054] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0056] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0057] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0058] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0059] At present, judging from the development of the market situation, the application of energy storage batteries is becoming more and more extensive. Energy storage batteries are widely used in energy storage systems such as hydropower, thermal power, wind power and solar power stations. For example, in solar energy storage systems, since the operating characteristics of solar cells are affected by changes in factors such as sunlight (irradiation) intensity and temperature, if the solar cell modules are directly connected to the load, it is often difficult for the load to operate in the optimal working state, and the system efficiency is very low. When energy storage batteries are used in solar cell energy storage systems, the energy storage batteries will compensate for the operating voltage of the load, ensuring that the system operates in the optimal working state. As the application fields of energy storage batteries continue to expand, their market demand is also constantly expanding.

[0060] The applicant has noticed that the characteristics of energy storage batteries are greatly affected by temperature. The capacity of energy storage batteries will decrease in low temperature environments. In addition, charging energy storage batteries at low temperatures may not be fully charged, which may also cause damage to the energy storage batteries and reduce their service life and effective capacity.

[0061] Based on the above considerations, an embodiment of the present application provides a battery control method for an energy storage system. When the battery temperature of the energy storage battery is lower than a preset temperature, the method heats the energy storage battery to ensure that the energy storage battery operates at an appropriate temperature and ensures the working performance of the energy storage battery.

[0062] The energy storage system disclosed in the embodiments of the present application can be used in electrical devices such as vehicles, ships, or aircraft. This helps to ensure the working performance of the energy storage battery and at the same time improve the stability of the energy storage battery performance and battery life.

[0063] The embodiments of the present application provide an electrical device that uses an energy storage system as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0064] Some embodiments of the present application provide a battery control method for an energy storage system. Figure 1 is a simplified structural diagram of an energy storage system provided in an embodiment of the present application. Referring to Figure 1 , the energy storage system includes a conversion circuit 1 and an energy storage battery 2. The conversion circuit 1 is connected to the energy storage battery 2, and the energy storage battery 2 can discharge energy to an external device 3 through the conversion circuit 1.

[0065] FIG2 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application. According to some embodiments of the present application, referring to FIG2 , the battery control method includes:

[0066] Step S101 , obtaining the battery temperature of the energy storage battery; Step S102 , in response to the battery temperature being lower than a preset temperature, heating the energy storage battery.

[0067] The energy storage system shown in Figure 1 includes a conversion circuit 1 and an energy storage battery 2. In other implementations, the energy storage system may include multiple conversion circuits 1 and energy storage batteries 2. Figure 1 shows only one as an example and is not limited thereto.

[0068] In the embodiment of the present application, the conversion circuit 1 mainly converts the electric energy of the energy storage battery 2 into an electric energy form that can be used by the external device 3, thereby enabling the energy storage battery 2 to power the external device.

[0069] Energy storage battery 2 has a battery management system (BMS), which can monitor the temperature of energy storage battery 2 in real time. Energy storage battery 2 may include multiple battery cells, and the BMS can monitor the temperature of each battery cell. It should be noted that the battery temperature of energy storage battery 2 can be the internal temperature of energy storage battery 2, the temperature of the energy storage battery 2 port, or the maximum, minimum, or average temperature of each battery cell.

[0070] The BMS can also monitor the operating current of the energy storage battery 2 in real time. In the present application, the operating current of the energy storage battery 2 can be a stable DC current, meaning that the operating current of the energy storage battery 2 is constant over a period of time. The operating current of the energy storage battery 2 can also be a converted DC current, in which case the operating current of the energy storage battery 2 can refer to the maximum current value of the converted DC current.

[0071] In some embodiments, the energy storage system has an equipment operation monitoring system (LEMS), which can be connected to the BMS for communication, so that the LEMS can also monitor the battery temperature of the energy storage battery 2 in real time and obtain the operating current of the energy storage battery 2.

[0072] According to some embodiments of the present application, the battery control method may be executed by, but is not limited to, an LEMS, for example, may also be executed by a BMS.

[0073] The preset temperature in the embodiment of the present application can be determined according to actual conditions, for example, the preset temperature is 0 degrees Celsius (°C); or the preset temperature is 5°C. When the battery temperature is lower than the preset temperature, it means that the current environment will or will soon have an impact on the energy storage battery 2, so heating measures need to be taken. That is, after step S101 obtains the battery temperature of the energy storage battery 2, if the battery temperature is lower than the preset temperature, step S102 is executed. If the battery temperature is greater than or equal to the preset temperature, the battery is not heated. In the process of heating the energy storage battery 2, the BMS can monitor the battery temperature of the energy storage battery 2 in real time. When the BMS detects that the battery temperature of the energy storage battery 2 is greater than or equal to the preset temperature, the LEMS will control to stop heating the energy storage battery 2.

[0074] In some embodiments of the present application, the battery temperature can be acquired in real time. If the acquired battery temperature is less than a preset temperature, step S102 is executed to heat the battery. In other words, during the battery heating process, the battery heating may be performed multiple times based on actual conditions. For example, if the battery temperature of energy storage battery 2 reaches the preset temperature after step S102 is performed once, heating of energy storage battery 2 can be stopped.

[0075] In the embodiment of the present application, the energy storage system may be a wind power generation system, a hydropower generation system, a thermal power generation system or a solar power generation system.

[0076] Referring again to FIG. 1 , according to some embodiments of the present application, the energy storage system further includes a power generation unit 4, which is connected to a conversion circuit 1, which is connected to an energy storage battery 2 and an external device 3. The electric energy generated by the power generation unit 4 is converted by the conversion circuit 1 into electric energy usable by the external device 3 for use by the external device 3. When the electric energy required by the external device 3 is less than the electric energy generated by the power generation unit 4, part of the electric energy can be converted by the conversion circuit 1 and stored in the energy storage battery 2; when the electric energy required by the external device 3 is greater than the electric energy generated by the power generation unit 4, the electric energy stored in the energy storage battery 2 is converted by the conversion circuit 1 into a form of electric energy usable by the external device 3 for use by the external device 3.

[0077] Taking the solar power generation system as an example, referring to Figure 1 again, the energy storage system may also include a power conversion unit 5, which is respectively connected to the power generation unit 4 and the conversion circuit 1. The power generation unit 4 may be a solar panel, and the power conversion unit 5 includes a maximum power point tracking (MPPT) controller. The MPPT controller is used to monitor the power generation voltage of the solar panel and track the maximum voltage and current values ​​so that the solar power generation system can output at maximum power to output electrical energy to the external device 3 or the energy storage battery 2.

[0078] In the embodiment of the present application, the energy storage battery is heated when the temperature of the energy storage battery is lower than a preset temperature to ensure that the battery operates at a suitable temperature and to ensure the working performance of the energy storage battery.

[0079] In one implementation of the embodiment of the present application, step S102 includes: controlling the energy storage battery to perform alternating charging and discharging through a conversion circuit.

[0080] In another implementation of the embodiment of the present application, step S102 includes: controlling the energy storage battery to be charged through the conversion circuit.

[0081] In another implementation of the embodiment of the present application, step S102 includes: controlling the energy storage battery to discharge through the conversion circuit.

[0082] In the embodiment of the present application, step S102 may also include any two or three of the above three implementation methods.

[0083] According to some embodiments of the present application, the energy storage battery 2 generates heat during both the discharge and charge processes, and heating is more conveniently achieved by charging, discharging, or alternating charging and discharging the energy storage battery 2. For example, the energy storage battery 2 may be heated by discharging the energy storage battery 2; or the energy storage battery 2 may be heated by charging the energy storage battery 2; or the energy storage battery 2 may be heated by alternating charging and discharging the energy storage battery 2.

[0084] In some embodiments, during the process of heating the battery, the battery can be heated multiple times until the battery temperature is greater than or equal to a preset temperature, that is, the above step S102 can be performed multiple times based on the battery temperature obtained in real time, that is, the energy storage battery 2 can be charged, discharged, or alternately charged and discharged multiple times in a cycle until the temperature of the energy storage battery 2 reaches the preset temperature.

[0085] According to some embodiments of the present application, referring to FIG1 , the conversion circuit 1 includes a capacitor, and controlling the energy storage battery to discharge through the conversion circuit includes: controlling the energy storage battery to discharge into the capacitor, and controlling the energy storage battery to charge through the conversion circuit includes: controlling the capacitor to charge the energy storage battery. FIG3 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application. Referring to FIG3 , when step S102 includes: controlling the energy storage battery to alternately charge and discharge through the conversion circuit, step S102 may include:

[0086] In step S121 , the energy storage battery is controlled to discharge to the capacitor; in step S122 , the capacitor is controlled to charge the energy storage battery.

[0087] Capacitors play a compensating role in the energy storage system, making the power delivered by the energy storage system to the energy storage battery 2 and the external device 3 more stable. Capacitors can be used to store electrical energy and also to release electrical energy.

[0088] In some embodiments of the present application, step S121 and step S122 may be performed alternately, that is, step S121 and step S122 may be repeated multiple times to achieve heating of the energy storage battery 2. The frequency of the alternation between step S121 and step S122 may be based on actual needs, and this application does not impose any special restrictions on this.

[0089] According to some embodiments of the present application, the capacitor used to charge or discharge the energy storage battery 2 can reuse the components originally existing in the energy storage system. The capacitor is used to charge or discharge the energy storage battery 2, and there is no need to arrange other components to charge or discharge the energy storage battery 2. This is more convenient and makes the structure of the energy storage system simpler.

[0090] According to some embodiments of the present application, referring to FIG1 , a conversion circuit 1 includes a DC bus, and a capacitor is provided on the DC bus.

[0091] When the capacitor is set on the DC bus, the capacitor can be called bus capacitance.

[0092] In the embodiment of the present application, it is more convenient to directly use the bus capacitor to charge or discharge the energy storage battery 2.

[0093] In one implementation of an embodiment of the present application, referring to FIG1 , the conversion circuit 1 includes a DCAC conversion circuit 11 , a DC bus is connected to the DC end of the DCAC conversion circuit 11 , and an AC end of the DCAC conversion circuit 11 is connected to an external device 3 .

[0094] In the embodiment of the present application, there may be multiple DCAC conversion circuits 11 in the energy storage system, and each DCAC conversion circuit 11 may be connected to an external device 3. FIG1 shows only one as an example, and is not limited thereto.

[0095] In this embodiment of the present application, the DC-AC conversion circuit 11 includes a bidirectional inverter, allowing the DC-AC conversion circuit 11 to convert AC power into DC power. Simultaneously, the DC-AC conversion circuit 11 can also convert DC power into AC power. When the external device 3 uses AC power, the DC-AC conversion circuit 11 can convert DC power from the energy storage system into AC power for use by the external device 3, which can be the power grid. The power grid can also convert AC power into DC power through the DC-AC conversion circuit 11 and supply it to the energy storage battery 2 connected to the conversion circuit 1 for energy storage.

[0096] In one implementation of the embodiment of the present application, the capacitor includes a bus capacitor C1 or C2 on a DC bus connected to the DCAC conversion circuit 11 .

[0097] In the embodiment of the present application, the DC-AC conversion circuit 11 and the MPPT controller both belong to the photovoltaic storage and charging conversion unit (PCS) of the solar power generation system, wherein the control board of the PCS is in communication with the LEMS.

[0098] In some embodiments of the present application, the DCAC conversion circuit 11 may be a multi-level DCAC conversion circuit. For example, when the external device 3 is a power grid, the DCAC conversion circuit 11 is a three-level DCAC conversion circuit, wherein the three-level DCAC conversion circuit includes three bridge arms.

[0099] In some embodiments of the present application, referring to FIG. 1 , the energy storage system further includes a three-phase contactor 6 , which is used to control the connection and closing between the power grid and the DCAC conversion circuit 11 .

[0100] In the embodiment of the present application, before step S121 or step S122 , the three-phase contactor 6 needs to be disconnected to prevent the external device 3 from affecting the charging or discharging of the energy storage battery 2 .

[0101] In an embodiment of the present application, when the external device 3 is a power grid, the energy storage system further includes a converter 7, which is used to connect the three-phase contactor 6 to the power grid to ensure that the electric energy transmitted by the energy storage system to the power grid can be used by the power grid.

[0102] When the energy storage battery needs to be heated, the DC bus connected to the DCAC conversion circuit 11 is directly used to charge or discharge the energy storage battery to heat the energy storage battery 2, which is more convenient without adding other components.

[0103] In another implementation of the embodiment of the present application, referring to FIG1 , the conversion circuit 1 includes a DC-DC conversion circuit 12, and the DC bus is connected to the bus terminal of the DCDC conversion circuit 12. That is, the capacitor used for charging and discharging the energy storage battery 2 is the DC bus capacitor connected to the DCDC conversion circuit 12. The battery terminal of the DCDC conversion circuit is connected to the energy storage battery 2.

[0104] The DCDC conversion circuit 12 is used to convert DC power into DC power and adjust the voltage. The electric energy transmitted by the energy storage system to the energy storage battery 2 is converted into electric energy that is more conducive to energy storage in the energy storage battery 2 after passing through the DCDC conversion circuit 12.

[0105] In the embodiment of the present application, the energy storage system may have multiple DCDC conversion circuits 12 and the energy storage batteries 2 connected thereto. FIG1 only shows one as an example, and the present invention is not limited thereto.

[0106] In one implementation of the embodiment of the present application, the capacitor includes a bus capacitor C3 on a DC bus connected to the DCDC conversion circuit 12 .

[0107] In another implementation of the embodiment of the present application, the capacitor C includes bus capacitors C1 and C2 on the DC bus connected to the DCAC conversion circuit 11 , and a bus capacitor C3 on the DC bus connected to the DCDC conversion circuit 12 .

[0108] In some embodiments of the present application, when the external device 3 uses AC power, the energy storage battery 2 outputs DC power. The energy storage battery 2 transmits the DC power to the DCAC conversion circuit 11 via the DCDC conversion circuit 12. The DCAC conversion circuit 11 then converts the DC power to AC power and transmits it to the external device. When the external device 3 outputs AC power, the external device 3 converts the AC power to DC power via the DCAC conversion circuit 11 and then transmits it to the DCDC conversion circuit 12. The DCDC conversion circuit 12 then converts the DC power into electrical energy suitable for use by the energy storage battery 2 for storage in the energy storage battery.

[0109] It is more convenient to directly use the DC bus connected to the DCDC conversion circuit 12 without adding other components.

[0110] In the embodiment of the present application, when the energy storage battery 2 is discharging, the DCDC conversion circuit 12 operates in a boost mode. When the energy storage battery 2 is charging, the DCDC conversion circuit 12 operates in a buck mode.

[0111] According to some embodiments of the present application, controlling the energy storage battery to discharge through the conversion circuit includes: controlling the energy storage battery to discharge to an external device through the conversion circuit, and wherein controlling the energy storage battery to charge through the conversion circuit includes: controlling the external device to charge the energy storage battery through the conversion circuit. Figure 4 is a flow chart of a battery control method for an energy storage system provided by an embodiment of the present application. Referring to Figure 4, when step S102 includes: controlling the energy storage battery to alternately charge and discharge through the conversion circuit, step S102 may include:

[0112] Step S123, controlling the energy storage battery to discharge to the external device through the conversion circuit; Step S124, controlling the external device to charge the energy storage battery through the conversion circuit.

[0113] In the energy storage system, the electric energy in the energy storage system is mainly used by the external device 3 , and the electric energy in the external device 3 and the electric energy in the energy storage battery 2 can be converted into each other.

[0114] In the embodiment of the present application, taking the external device 3 as an electric grid as an example, before steps S123 and S124 , the three-phase contactor 6 needs to be closed to ensure the connection between the external device 3 and the energy storage battery 2 .

[0115] In some embodiments of the present application, step S123 and step S124 may be performed alternately, that is, step S123 and step S124 may be repeated multiple times to achieve heating of the energy storage battery 2. The frequency of the alternation between step S123 and step S124 may be performed according to actual needs, and this application does not impose any special restrictions on this.

[0116] In the embodiment of the present application, the external device 3 is directly connected to the energy storage system. It is more convenient to charge or discharge the energy storage battery 2 directly using the external device 3, without arranging other components in the energy storage system.

[0117] According to some embodiments of the present application, the conversion circuit 1 includes a DCAC conversion circuit 11 , the external device 3 is a power grid, and the DCAC conversion circuit 11 is connected to the power grid.

[0118] The entire power system, consisting of substations and transmission and distribution lines of various voltages, is called a power grid. The power grid's mission is to transmit and distribute electrical energy and change voltage. The DC-AC conversion circuit 11 converts the direct current (DC) power delivered by the power generation unit 4 into AC power for use in the power grid, allowing the entire energy storage system to supply power to the grid, fulfilling its power generation function.

[0119] According to some embodiments of the present application, FIG5 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application. Referring to FIG5 , the method includes:

[0120] Step S201, obtaining the battery temperature of the energy storage battery; step S202, obtaining the battery voltage of the energy storage battery; step S203, performing an operation of heating the energy storage battery when the battery temperature is lower than a preset temperature and the battery voltage is higher than a preset battery voltage.

[0121] In the embodiment of the present application, the operation of heating the energy storage battery may include charging or discharging the energy storage battery. The battery voltage of the energy storage battery 2 may be obtained by the BMS, which sends the battery voltage to the LEMS. The LEMS determines whether the energy storage battery 2 is suitable for charging or discharging based on the battery voltage.

[0122] In the embodiment of the present application, the battery voltage of the energy storage battery 2 is first obtained before charging or discharging the energy storage battery 2. The battery voltage is used to determine whether the energy storage battery 2 is suitable for charging or discharging. When the battery voltage is greater than the preset battery voltage, the energy storage battery 2 is charged or discharged. This prevents the energy storage battery 2 from being discharged even when the battery voltage is too low, which could affect the safety performance of the energy storage battery 2.

[0123] In the embodiment of the present application, when the battery voltage is less than or equal to the preset battery voltage, the operation of heating the energy storage battery is not performed.

[0124] According to some embodiments of the present application, FIG6 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application. Referring to FIG6 , the method includes:

[0125] Step S301, obtaining the battery temperature of the energy storage battery; step S302, obtaining the battery voltage of the energy storage battery; step S303, obtaining the state of charge of the energy storage battery; step S304, performing an operation of heating the energy storage battery when the battery temperature is lower than a preset temperature, the battery voltage is higher than a preset battery voltage, and the state of charge is higher than a preset state of charge.

[0126] In the embodiment of the present application, the operation of heating the energy storage battery may include charging or discharging the energy storage battery. The state of charge (SOC) of the energy storage battery 2 can be obtained by the BMS, which sends the SOC to the LEMS. The LEMS determines whether the energy storage battery 2 is suitable for charging or discharging based on the SOC.

[0127] In the embodiment of the present application, the preset state of charge is greater than or equal to 10% and less than or equal to 20%, for example, the preset state of charge is 15%.

[0128] In an embodiment of the present application, the above-mentioned step S302 and step S303 can be performed simultaneously or at different times. For example, step S302 is performed before step S303, or step S303 is performed before step S302. This application does not impose any restrictions on this.

[0129] In the embodiment of the present application, the state of charge of the energy storage battery 2 is first obtained before charging or discharging the energy storage battery 2. The state of charge is used to determine whether the energy storage battery 2 is suitable for charging or discharging. When the state of charge is greater than a preset state of charge, the energy storage battery 2 is charged or discharged. This avoids the situation where discharging the energy storage battery 2 when the state of charge is too low may affect the safety performance of the energy storage battery 2.

[0130] In the embodiment of the present application, when the state of charge is less than or equal to the preset state of charge, the operation of controlling the energy storage battery to perform alternating charging and discharging through the conversion circuit is not performed.

[0131] In the embodiment of the present application, before executing step S304, the LEMS can monitor whether there is a fault in the entire energy storage system. When there is a fault in any part of the entire energy storage system, the operation of heating the energy storage battery 2 is not performed.

[0132] According to some embodiments of the present application, FIG7 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application. Referring to FIG7 , the method includes:

[0133] Step S701, obtaining the battery temperature of the energy storage battery; Step S702, in response to the battery temperature being less than a preset temperature, heating the energy storage battery; Step S703, obtaining the working status information of the energy storage battery; Step S704, adjusting the working parameters for heating the energy storage battery based on the working status information.

[0134] In an embodiment of the present application, during the heating process of the energy storage battery, the operating status information of the energy storage battery is obtained, and the operating parameters of the energy storage battery are adjusted based on the operating status information, so that the operating parameters of the energy storage battery during the charging or discharging process can always meet the preset conditions, thereby ensuring the heating speed of the energy storage battery and improving the heating efficiency.

[0135] According to some embodiments of the present application, step S703 includes: obtaining the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit. Step S704 includes: adjusting the operating parameters for heating the energy storage battery based on the current operating current and preset conditions.

[0136] In some embodiments of the present application, the above-mentioned step S702 may include at least one of: controlling the energy storage battery to alternately charge and discharge through the conversion circuit; controlling the energy storage battery to discharge through the conversion circuit; and controlling the energy storage battery to charge through the conversion circuit.

[0137] For example, the current operating current of the energy storage battery 2 when it is charged or discharged by the conversion circuit 1 can be obtained during each charging or discharging process. The charging or discharging of the energy storage battery 2 is performed in pulses, and the frequency of charging and discharging can be determined according to actual needs.

[0138] In an embodiment of the present application, during the process of heating the energy storage battery, the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit is obtained. When the current operating current does not meet a preset condition, the operating current of the energy storage battery when it is charged or discharged through the conversion circuit is adjusted so that the operating current of the energy storage battery during the charging or discharging process can always meet the preset condition. Since the operating current of the energy storage battery during the charging or discharging process affects the heating speed of the energy storage battery, the heating speed of the energy storage battery can be guaranteed by adjusting the current operating current during charging and discharging, thereby improving the heating efficiency.

[0139] In the embodiment of the present application, if the current operating current meets the preset condition, the operating current of the energy storage battery 2 is not adjusted when it is charged or discharged through the conversion circuit 1. For example, the preset condition can be a preset reference current.

[0140] In some embodiments of the present application, the adjusted operating parameters may be the same as or different from the adjusted operating parameters.

[0141] At the same time, the operating current of the energy storage battery during charging or discharging has an upper limit value and cannot be too large. Too large an operating current will affect the safety performance of the energy storage battery. The method provided in the embodiment of the present application can also ensure that the operating current of the energy storage battery is within a safe range, thereby avoiding damage to the energy storage battery or even safety accidents caused by the current operating current being too large.

[0142] According to some embodiments of the present application, referring to FIG1 , the conversion circuit 1 includes a current sensor 13 configured to detect the operating current of the energy storage battery 2. Step S703 includes obtaining, via the current sensor, the current operating current of the energy storage battery when it is being charged or discharged through the conversion circuit.

[0143] As shown in FIG1 , the current sensor 13 is connected to the energy storage battery 2 , so that the current sensor 13 can detect the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit.

[0144] The current sensor 13 can be used to conveniently obtain the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit.

[0145] In one implementation of the embodiment of the present application, the current sensor 13 is a Hall sensor.

[0146] According to some embodiments of the present application, the preset condition includes a preset reference voltage. FIG8 is a flow chart of a battery control method for an energy storage system provided by an embodiment of the present application. Referring to FIG8 , step S704 includes:

[0147] Step S741, obtaining the current operating voltage of the energy storage battery when it is charged or discharged through the conversion circuit based on the current operating current; Step S742, adjusting the operating current of the energy storage battery when it is charged or discharged through the conversion circuit based on the current operating voltage and a preset reference voltage.

[0148] In the embodiment of the present application, the Hall sensor can detect the operating current and then output an operating voltage corresponding to the operating current.

[0149] The operating current and operating voltage of the energy storage battery 2 have a corresponding relationship. The corresponding current operating voltage can be determined based on the current operating current. Then, based on the relationship between the current operating voltage and the preset reference voltage, the relationship between the operating current and the preset reference current of the energy storage battery 2 when it is charged or discharged through the conversion circuit can be judged.

[0150] In an embodiment of the present application, the DCDC conversion circuit 12 is controlled by a DCDC control board 122. FIG9 is a circuit diagram of a DCDC control board provided in an embodiment of the present application. Referring to FIG9 , the DCDC control board 122 includes a central processing unit (CPU) 1221, a controllable power chip 1222, a differential amplifier 1223, and a follower 1224. The CPU 1221 is connected to the controllable power chip 1222, which is connected to the differential amplifier 1223. The differential amplifier 1223 is connected to the follower 1224, which is connected to the CPU 1221. The differential amplifier 1223 is also connected to the output of the Hall effect sensor. The output of the Hall effect sensor outputs an operating voltage Vout to the differential amplifier 1223. The CPU 1221 controls the controllable power chip 1222 to output a preset reference voltage Vref to the differential amplifier 1223. The differential amplifier 1223 compares the operating voltage Vout with the preset reference voltage Vref. The follower 1224 is used to perform operations such as filtering on the result output by the differential amplifier 1223 to ensure the stability of the result output by the differential amplifier 1223. At the same time, the follower 1224 outputs the result to the CPU 1221. The CPU 1221 determines whether the operating current meets the preset conditions based on the relationship between the operating voltage Vout and the preset reference voltage Vref.

[0151] In an embodiment of the present application, the Hall sensor monitors the operating current Iout, and the controllable power supply chip 1222 outputs a preset reference voltage Vref. In actual comparison, it can be determined whether the operating current Iout meets the preset conditions based on the relationship between the preset reference current Iref actually corresponding to Vref and the operating current Iout.

[0152] For example, when the operating current Iout is a variable DC current, assuming that the waveform of the operating current Iout is a sinusoidal wave, FIG10 is a waveform diagram of one operating current provided in an embodiment of the present application. FIG11 is a waveform diagram of another operating current provided in an embodiment of the present application. Referring to FIG10 and FIG11 , when the maximum value of the operating current Iout is less than the preset reference current Iref, the intersection of the waveform of the operating current Iout and the baseline of the preset reference current Iref is 0, and Iout outputs a low level; when the maximum value of the operating current Iout is equal to the preset reference current Iref, the intersection of the two is 1; when the maximum value of the operating current Iout is greater than the preset reference current Iref, the intersection of the two is 2, and Iout outputs a high level. The operating current Iout can be adjusted based on the position and timing of the intersection. The difference between FIG10 and FIG11 is that in FIG10 , the variation pattern of the operating current Iout is the same, and the preset reference currents Iref (Iref1, Iref2, Iref3) are different, while in FIG11 , the variation pattern of the operating current Iout is different, and the preset reference current Iref is constant. FIG. 10 and FIG. 11 are only for explanation and do not represent the actual operating current Iout and the preset reference current Iref.

[0153] FIG12 is a block diagram of an energy storage system provided by an embodiment of the present application. Referring to FIG12 , the PCS control board, the DCDC control board, and the BMS are in communication with each other.

[0154] In one implementation of the embodiment of the present application, step S742 includes: in response to the current operating voltage being greater than a preset reference voltage, reducing the operating current of the energy storage battery when it is charged or discharged through the conversion circuit.

[0155] When the current operating current of the energy storage battery 2 is greater than the preset reference voltage, it indicates that the current operating current is too large, which may affect the safety performance of the system. The current operating current is reduced to ensure the safety performance of the energy storage system.

[0156] In another implementation of the embodiment of the present application, step S742 includes: in response to the current operating voltage being less than a preset reference voltage, increasing the operating current of the energy storage battery when it is charged or discharged through the conversion circuit.

[0157] When the current working current of the energy storage battery 2 is less than the preset reference voltage, it indicates that the current working current is too small, which affects the heating efficiency. The current working current should be increased to ensure the heating efficiency.

[0158] Some embodiments of the present application provide a battery control device for an energy storage system. Figure 13 is a block diagram of a battery control device for an energy storage system provided in an embodiment of the present application. Referring to Figure 13 , the battery control device for the energy storage system includes a first acquisition module 401 and a control module 402. The first acquisition module 401 is configured to acquire the battery temperature of the energy storage battery. The control module 402 is configured to heat the energy storage battery in response to the battery temperature being less than a preset temperature.

[0159] In some embodiments of the embodiments of the present application, the control module 402 is configured to execute at least one of the following heating strategies: controlling the energy storage battery to alternately charge and discharge through the conversion circuit; controlling the energy storage battery to charge through the conversion circuit; and controlling the energy storage battery to discharge through the conversion circuit.

[0160] In one implementation of the present embodiment, the conversion circuit includes a capacitor. FIG14 is a block diagram of a battery control device for an energy storage system provided in an embodiment of the present application. Referring to FIG14 , the control module 402 includes a first control unit 421 and a second control unit 422. The first control unit 421 is configured to control the energy storage battery to discharge into the capacitor; the second control unit 422 is configured to control the capacitor to charge the energy storage battery.

[0161] In an embodiment of the present application, the conversion circuit includes a DC bus, and the capacitor is arranged on the DC bus.

[0162] In one implementation of the embodiment of the present application, the conversion circuit includes a DCAC conversion circuit, the DC bus is connected to the DC end of the DCAC conversion circuit, and the AC end of the DCAC conversion circuit is connected to an external device.

[0163] In another implementation of the embodiment of the present application, the conversion circuit includes a DCDC conversion circuit, the DC bus is connected to the bus terminal of the DCDC conversion circuit, and the battery terminal of the DCDC conversion circuit is connected to the energy storage battery.

[0164] Figure 15 is a block diagram of a battery control device for an energy storage system according to an embodiment of the present application. Referring to Figure 15 , the control module 402 includes a third control unit 423 and a fourth control unit 424. The third control unit 423 is configured to control the energy storage battery to discharge to an external device via a conversion circuit; the fourth control unit 424 is configured to control the external device to charge the energy storage battery via the conversion circuit.

[0165] In an embodiment of the present application, the conversion circuit includes a DCAC conversion circuit, the external device is a power grid, and the DCAC conversion circuit is connected to the power grid.

[0166] In an embodiment of the present application, Figure 16 shows a block diagram of a battery control device for an energy storage system. Referring to Figure 16 , the device further includes a third acquisition module 405 configured to acquire the battery voltage of the energy storage battery. The control module 402 is configured to heat the energy storage battery if the battery voltage is greater than a preset battery voltage.

[0167] In the embodiment of the present application, referring to FIG16 , the apparatus further includes a fourth acquisition module 406 configured to acquire the state of charge of the energy storage battery. The control module 402 is configured to heat the energy storage battery if the state of charge is greater than a preset state of charge.

[0168] In the embodiment of the present application, referring to FIG16 , the apparatus further includes a second acquisition module 403 and an adjustment module 404. The second acquisition module 403 is configured to acquire operating status information of the energy storage battery. The adjustment module 404 is configured to adjust operating parameters for heating the energy storage battery based on the operating status information.

[0169] In the embodiment of the present application, the second acquisition module 403 is configured to acquire the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit. The adjustment module 404 is configured to adjust the operating parameters of the energy storage battery heating based on the current operating current and preset conditions.

[0170] In the embodiment of the present application, the conversion circuit includes a current sensor configured to detect the operating current of the energy storage battery. The second acquisition module 403 is configured to acquire the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit through the current sensor.

[0171] In an embodiment of the present application, the preset condition includes a preset reference voltage. FIG17 is a block diagram of a battery control device for an energy storage system provided in an embodiment of the present application. Referring to FIG17 , the adjustment module 404 includes an acquisition unit 441 and an adjustment unit 442. The acquisition unit 441 is configured to acquire the current operating voltage of the energy storage battery when it is being charged or discharged through the conversion circuit based on the current operating current. The adjustment unit 442 is configured to adjust the operating current of the energy storage battery when it is being charged or discharged through the conversion circuit based on the current operating voltage and the preset reference voltage.

[0172] In the embodiment of the present application, the adjustment unit 442 is configured to reduce the operating current of the energy storage battery when it is charged or discharged through the conversion circuit in response to the current operating voltage being greater than the preset reference voltage.

[0173] In the embodiment of the present application, the adjustment unit 442 is further configured to increase the operating current of the energy storage battery when it is charged or discharged through the conversion circuit in response to the current operating voltage being less than the preset reference voltage.

[0174] Some embodiments of the present application provide an energy storage system, which includes a conversion circuit, an energy storage battery, and the battery control device in the above embodiments. The conversion circuit is connected to the energy storage battery, and the energy storage battery discharges to an external device through the conversion circuit.

[0175] The energy storage system provided in the embodiment of the present application can heat the energy storage battery.

[0176] Some embodiments of the present application provide an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the methods in the above embodiments.

[0177] Some embodiments of the present application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the methods of the above embodiments. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0178] Some embodiments of the present application provide a computer program product, including a computer program, that, when executed by a processor, implements the methods described in the above embodiments. The computer program product includes one or more computer instructions. When these computer instructions are loaded and executed on a computer, they can implement, in whole or in part, some or all of the methods described in the above embodiments according to the processes or functions described in the embodiments of the present application.

[0179] The present invention provides a battery control method for an energy storage system, which can improve the heating efficiency of the energy storage battery and ensure the normal operation of the energy storage battery. The method has two main forms, which are described below.

[0180] FIG18 is a flow chart of a battery control method for an energy storage system provided in an embodiment of the present application. Referring to FIG18 , the method includes:

[0181] Step S501, obtaining the battery temperature of the energy storage battery. Step S502, obtaining the battery voltage of the energy storage battery. Step S503, obtaining the state of charge of the energy storage battery. Step S504, in response to the battery temperature being lower than a preset temperature, the battery voltage being higher than a preset battery voltage, and the state of charge being higher than a preset state of charge, executing control of the energy storage battery to discharge to the capacitor and controlling the capacitor to charge the energy storage battery. Step S505, obtaining the operating current of the energy storage battery when alternately charging and discharging through the conversion circuit. Step S506, in response to the operating current not meeting the preset condition, adjusting the operating current of the energy storage battery when alternately charging and discharging through the conversion circuit.

[0182] FIG19 is a flow chart of another battery control method for an energy storage system provided in an embodiment of the present application. Referring to FIG19 , the method includes:

[0183] Step S601, obtaining the battery temperature of the energy storage battery. Step S602, obtaining the battery voltage of the energy storage battery. Step S603, obtaining the state of charge of the energy storage battery. Step S604, in response to the battery temperature being lower than a preset temperature, the battery voltage being higher than a preset battery voltage, and the state of charge being higher than a preset state of charge, executing control of the energy storage battery to discharge to an external device through a conversion circuit and controlling the external device to charge the energy storage battery through the conversion circuit. Step S605, obtaining the operating current of the energy storage battery when alternately charging and discharging through the conversion circuit. Step S606, in response to the operating current not meeting the preset condition, adjusting the operating current of the energy storage battery when alternately charging and discharging through the conversion circuit.

[0184] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery control method for an energy storage system, wherein the energy storage system includes a conversion circuit and an energy storage battery, the conversion circuit is connected to the energy storage battery, and the energy storage battery discharges to an external device through the conversion circuit, the method comprising: Obtaining the battery temperature of the energy storage battery; In response to the battery temperature being lower than a preset temperature, the energy storage battery is heated.

2. The battery control method according to claim 1, wherein: The heating of the energy storage battery includes at least one of the following heating strategies: Controlling the energy storage battery to alternately charge and discharge through the conversion circuit; controlling the energy storage battery to be charged through the conversion circuit; and The energy storage battery is controlled to discharge through the conversion circuit.

3. The battery control method according to claim 2, wherein: The conversion circuit includes a capacitor, Wherein, controlling the energy storage battery to discharge through the conversion circuit includes: controlling the energy storage battery to discharge to the capacitor, And wherein, controlling the energy storage battery to be charged through the conversion circuit includes: Controlling the capacitor to charge the energy storage battery.

4. The battery control method according to claim 3, wherein: The conversion circuit includes a DC bus, and the capacitor is arranged on the DC bus.

5. The battery control method according to claim 4, wherein: The conversion circuit includes a DCAC conversion circuit, the DC bus is connected to a DC end of the DCAC conversion circuit, and an AC end of the DCAC conversion circuit is connected to the external device.

6. The battery control method according to claim 4, wherein: The conversion circuit includes a DCDC conversion circuit, the DC bus is connected to the bus terminal of the DCDC conversion circuit, and the battery terminal of the DCDC conversion circuit is connected to the energy storage battery.

7. The battery control method according to claim 2, wherein: Controlling the energy storage battery to discharge through the conversion circuit includes: controlling the energy storage battery to discharge to the external device through the conversion circuit, And wherein, controlling the energy storage battery to be charged through the conversion circuit includes: The external device is controlled to charge the energy storage battery through the conversion circuit.

8. The battery control method according to claim 7, wherein: The conversion circuit includes a DCAC conversion circuit, the external device is a power grid, and the DCAC conversion circuit is connected to the power grid.

9. The battery control method according to any one of claims 1 to 8, wherein: Before heating the energy storage battery, the method further includes: obtaining the battery voltage of the energy storage battery, Wherein, heating the energy storage battery comprises: When the battery voltage is greater than a preset battery voltage, the energy storage battery is heated.

10. The battery control method according to any one of claims 1 to 8, wherein: Before heating the energy storage battery, the method further includes: Obtaining the state of charge of the energy storage battery, Wherein, heating the energy storage battery comprises: When the state of charge is greater than a preset state of charge, an operation of heating the energy storage battery is performed.

11. The battery control method according to any one of claims 2 to 8, further comprising: During the heating of the energy storage battery, obtaining working status information of the energy storage battery; The operating parameters for heating the energy storage battery are adjusted based on the operating status information.

12. The battery control method according to claim 11, wherein: The obtaining of the working status information of the energy storage battery includes: obtaining the current working current of the energy storage battery when it is charged or discharged through the conversion circuit, Wherein, adjusting the operating parameters for heating the energy storage battery based on the operating status information includes: Based on the current operating current and preset conditions, operating parameters for heating the energy storage battery are adjusted.

13. The battery control method according to claim 12, wherein: The conversion circuit includes a current sensor configured to detect the operating current of the energy storage battery. Wherein, obtaining the current operating current of the energy storage battery when being charged or discharged through the conversion circuit includes: The current sensor is used to obtain the current operating current of the energy storage battery when it is charged or discharged through the conversion circuit.

14. The battery control method according to claim 13, wherein: The preset condition includes a preset reference voltage, and adjusting the operating parameters for heating the energy storage battery based on the operating status information includes: Obtaining a current operating voltage of the energy storage battery when being charged or discharged by the conversion circuit based on the current operating current; Based on the current operating voltage and the preset reference voltage, the operating current of the energy storage battery when being charged or discharged through the conversion circuit is adjusted.

15. The battery control method according to claim 14, wherein: Adjusting the operating current of the energy storage battery when it is charged or discharged through the conversion circuit based on the current operating voltage and the preset reference voltage includes: In response to the current operating voltage being greater than the preset reference voltage, the operating current of the energy storage battery when being charged or discharged through the conversion circuit is reduced.

16. The battery control method according to claim 14, wherein: Adjusting the operating current of the energy storage battery when it is charged or discharged through the conversion circuit based on the current operating voltage and the preset reference voltage includes: In response to the current operating voltage being lower than the preset reference voltage, the operating current of the energy storage battery when being charged or discharged through the conversion circuit is increased.

17. A battery control device for an energy storage system, comprising: A first acquisition module is configured to acquire a battery temperature of the energy storage battery; The control module is configured to heat the energy storage battery in response to the battery temperature being lower than a preset temperature.

18. An energy storage system comprising a conversion circuit, an energy storage battery, and the battery control device according to claim 17, wherein the conversion circuit is connected to the energy storage battery, and the energy storage battery discharges to an external device through the conversion circuit.

19. An electronic device comprising: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 16.

20. A computer-readable storage medium storing a computer program, wherein the computer program implements the method according to any one of claims 1 to 16 when executed by a processor.

21. A computer program product comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements the method according to any one of claims 1 to 16.

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