Heating control method and device and energy storage system

Abstract

Disclosed are a heating control method and device and an energy storage system. The heating control method is applied to an energy storage system, the energy storage system comprising a battery pack (101), an inverter (102), and a heat dissipation fan (106) disposed within a same housing, and the battery pack (101) comprising battery cells (104) and a heating film (105). The heating control method comprises: detecting the temperature of the battery cells (104); and, on the basis of a temperature change of the battery cells (104), selecting, from a plurality of heating modes of the energy storage system, a target heating mode matching the temperature change of the battery cells (104) and performing heating control, wherein the heating modes at least comprise coordinated control of the heat dissipation fan (106) and the heating film (105).

Description

Heating control method, device and energy storage system

[0001] Priority information

[0002] The present application claims priority to and the benefit of the filing date of Chinese Patent Application No. 202410674543.5, filed May 27, 2024, and which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of inverters, and in particular to a heating control method, device and energy storage system. BACKGROUND

[0004] At present, new energy is developing rapidly, and the corresponding energy storage system is also experiencing rapid growth. The energy storage system at least includes a battery pack and an inverter.

[0005] The energy storage system is usually installed outdoors. When the outdoor environment temperature decreases, the temperature of the battery cell in the energy storage system also decreases. The charging and discharging efficiency of the battery cell will decrease at low temperature, and the battery cell may even be unable to charge and discharge.

[0006] Therefore, when the temperature of the battery cell is too low at present, an additional heating module needs to be used to heat the battery cell, so that the battery cell can normally charge and discharge. This external structure for heating the battery cell has the disadvantages of high power consumption, low efficiency and uneconomicalness. SUMMARY

[0007] The present application provides a heating control method, device and energy storage system to solve the problem that an external heating module is needed to heat the battery cell in the existing energy storage system.

[0008] According to an aspect of the present application, a heating control method is provided, which is applied to an energy storage system. The energy storage system includes a battery pack, an inverter and a cooling fan in the same box body. The battery pack includes a battery cell and a heating film. The heating control method includes:

[0009] detecting the temperature of the battery cell;

[0010] based on the temperature change of the battery cell, selecting a target heating mode matched with the temperature change of the battery cell from a plurality of heating modes of the energy storage system for heating control, the heating mode at least including linkage control of the cooling fan and the heating film.

[0011] Further, the heating control method further includes:

[0012] if the minimum temperature of the battery cell is greater than a first low temperature threshold and / or the maximum temperature of the battery cell is greater than a first high temperature threshold, controlling the cooling fan and the heating film to be both turned off.

[0013] Further, a heat insulation layer is arranged between the battery pack and the inverter, the energy storage system further comprises a photovoltaic array, and the inverter is connected to the photovoltaic array; the plurality of heating modes of the energy storage system comprises a first heating mode;

[0014] The target heating mode matched with the temperature change of the battery cell is selected for heating control, including: the lowest temperature of the battery cell is less than a first low temperature threshold, if it is detected that the photovoltaic power of the photovoltaic array is greater than a first power threshold, or the output power of the inverter is greater than a second power threshold, the first heating mode is controlled to be adjusted, and the first heating mode comprises starting the heat dissipation fan and opening the heat insulation layer.

[0015] Further, after the first heating mode is controlled to be adjusted, the method further comprises:

[0016] If the temperature change rate of the battery cell is less than a first change rate threshold after a first set time period, the heat dissipation fan is controlled to be turned off.

[0017] Further, the plurality of heating modes of the energy storage system comprises a second heating mode;

[0018] The target heating mode matched with the temperature change of the battery cell is selected for heating control, including:

[0019] The lowest temperature of the battery cell is less than a first low temperature threshold, if the temperature change rate of the battery cell is less than a second change rate threshold after a second set time period, the second heating mode is controlled to be adjusted, and the second heating mode comprises starting the heating film to heat.

[0020] Further, the energy storage system further comprises a photovoltaic array, and the inverter is connected to the photovoltaic array; the plurality of heating modes of the energy storage system comprises a second heating mode;

[0021] The target heating mode matched with the temperature change of the battery cell is selected for heating control, including:

[0022] The lowest temperature of the battery cell is less than a first low temperature threshold, if it is detected that the photovoltaic power of the photovoltaic array is in a limited power state, or the photovoltaic power of the photovoltaic array is greater than the output power of the inverter, or the lowest temperature of the battery cell is less than a second low temperature threshold, the second heating mode is controlled to be adjusted, and the second heating mode comprises starting the heating film to heat;

[0023] The second low temperature threshold is less than the first low temperature threshold.

[0024] Further, the energy storage system further comprises a photovoltaic array, and the inverter is connected with the photovoltaic array; the plurality of heating modes of the energy storage system comprises a third heating mode;

[0025] The heating control in the target heating mode matched with the temperature change of the battery cell comprises:

[0026] The lowest temperature of the battery cell is less than a first low temperature threshold, and if the photovoltaic power of the photovoltaic array is detected to be in a limited power state and the lowest temperature of the battery cell is less than a second low temperature threshold, the control is adjusted to the third heating mode, and the third heating mode comprises starting the heat film while starting the heat dissipation fan;

[0027] The second low temperature threshold is less than the first low temperature threshold.

[0028] Further, after starting the heat film, the method further comprises:

[0029] If the temperature of the heat film is greater than or equal to a heat film limited temperature, the control is to turn off the heat film.

[0030] Further, a heat insulation layer is arranged between the battery pack and the inverter.

[0031] After starting the heat film, the method further comprises: controlling to turn off the heat insulation layer.

[0032] According to another aspect of the present application, a heating control device is provided, which is applied to an energy storage system, the energy storage system comprising a battery pack, an inverter and a heat dissipation fan in the same box, and the battery pack comprising a battery cell and a heat film; the heating control device comprises:

[0033] A temperature detection module is configured to detect the temperature of the battery cell.

[0034] A heating control module is configured to select a target heating mode matched with the temperature change of the battery cell from a plurality of heating modes of the energy storage system based on the temperature change of the battery cell, and perform heating control in the target heating mode, wherein the heating mode at least comprises linkage control of the heat dissipation fan and the heat film.

[0035] According to another aspect of the present application, an energy storage system is provided, comprising a battery pack, an inverter, a heat dissipation fan and a heating control device as described above.

[0036] The battery pack comprises a battery cell and a heat film.

[0037] The heating control device is connected with the battery pack, the inverter and the heat dissipation fan respectively.

[0038] Further, the energy storage system further comprises a heat insulation layer arranged between the battery pack and the inverter.

[0039] The heating control device is connected to the heat insulation layer and is configured to control the heat insulation layer to be opened or closed.

[0040] In the present application, the heating control device acquires the temperature of the battery cell in the battery pack, and controls flexible adjustment of the heating mode of the battery cell based on the temperature change of the battery cell in the battery pack. The heating mode can be adjusted to be opened to the heat dissipation fan, so as to realize low-power-consumption battery cell heating. Or, the heating mode can be adjusted to be opened to the heating film, so as to realize high-efficiency battery cell heating. Or, the heating mode can be adjusted to be opened to the heat dissipation fan and the heating film at the same time to heat the battery cell, so as to further improve the heating efficiency of the battery cell while effectively utilizing the heat generated by the inverter. Compared with the prior art of using a heating module to heat the battery cell, the heating control method of the battery cell in the present application can flexibly adjust the heating mode, can meet different application scenarios and different use requirements, improves the energy utilization rate of the energy storage system, reduces the heating loss, and can keep the battery cell warm for a long time, saves electricity bills, has the advantages of low power consumption, high efficiency and low economic cost.

[0041] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0042] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0043] FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the present application;

[0044] FIG. 2 is a schematic diagram of another energy storage system according to an embodiment of the present application;

[0045] FIG. 3 is a schematic diagram of a heating control method according to an embodiment of the present application;

[0046] FIG. 4 is a schematic diagram of another heating control method according to an embodiment of the present application;

[0047] FIG. 5 is a schematic diagram of another heating control method according to an embodiment of the present application;

[0048] FIG. 6 is a schematic diagram of another heating control method according to an embodiment of the present application;

[0049] FIG. 7 is a schematic diagram of a heating control device according to an embodiment of the present application;

[0050] FIG. 8 is a schematic diagram of an electronic device according to an embodiment of the present application.

[0051] Reference signs: battery pack 101, inverter 102, heating control device 103, battery cell 104, heating film 105, heat dissipation fan 106, heat insulation layer 107, photovoltaic array 108, temperature detection module 410, heating control module 420, electronic device 510, processor 511, read-only memory 512, random access memory 513, bus 514, input / output interface 515, input unit 516, output unit 517, storage unit 518, communication unit 519. DETAILED DESCRIPTION

[0052] Embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0053] The disclosure below provides many different embodiments or examples for implementing different structures of the embodiments of the present application. In order to simplify the disclosure of the embodiments of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. The embodiments of the present application can refer to the same reference numerals and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, which does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the embodiments of the present application provide examples of various specific processes and materials, but those skilled in the art can realize the application of other processes and / or the use of other materials.

[0054] It should be noted that in some embodiments, the heating control method provided by the embodiments of the present application is applied to an energy storage system, which can be a balcony energy storage system. The balcony photovoltaic energy storage device is relatively small and easy to move, and can be moved according to the user's electricity demand, for example, from the balcony position to the garage or even outdoor. In the existing balcony energy storage system, the inverter and the battery pack are separately arranged. In low temperature conditions, the battery cells in the battery pack cannot be normally charged and discharged due to too low temperature, and the battery pack needs to be heated to reach the normal working temperature range. The heating process has large power loss. In order to solve the problem of large power loss caused by heating of the battery cells in the existing balcony energy storage system under low temperature conditions, the embodiments of the present application provide an energy storage system in which the inverter and the battery pack (also referred to as a battery module) are integrated in the same box. The inverter generates a large amount of heat, and in low temperature conditions, the heat generated by the inverter can be fully utilized to heat the battery pack, avoiding heating the battery pack by additional power, thereby reducing power consumption. The heating control method applied to the energy storage system will be described below.

[0055] To solve the problems in the prior art, the application provides a heating control method, which is applied to an energy storage system and can be executed by a heating control device in the form of hardware and / or software.

[0056] FIG. 1 is a schematic diagram of an energy storage system according to an embodiment of the application. As shown in FIG. 1, the energy storage system comprises a battery pack 101, an inverter 102, a heat dissipation fan 106 and a heating control device 103. The battery pack 101 comprises a battery cell 104 and a heating film 105. The heating control device 103 is connected to the battery pack 101, the inverter 102 and the heat dissipation fan 106 respectively.

[0057] In this embodiment, the energy storage system comprises the inverter 102 and the heat dissipation fan 106. The heat dissipation fan 106 is arranged near the inverter 102. Specifically, the heat dissipation fan 106 is arranged on the side of the inverter 102 facing the battery pack 101, but is not limited thereto. In other embodiments, the heat dissipation fan can also be arranged on other sides of the inverter, or even on the side surface of the inverter away from the battery pack. The heat dissipation fan 106 can dissipate the heat inside the inverter 102 to the outside of the inverter 102. The heating control device 103 is connected to at least the heat dissipation fan 106. The heating control device 103 can control the start and stop of the heat dissipation fan 106, and can also control the speed of the heat dissipation fan 106.

[0058] The energy storage system comprises the battery pack 101, which comprises a plurality of battery cells 104. The battery pack 101 can provide direct current to the inverter 102. The inverter 102 can convert the received direct current into alternating current and output to other loads or power grids. The battery pack 101 further comprises a heating film 105. The heating control device 103 is connected to at least the heating film 105. The heating control device 103 can control the opening and closing of the heating film 105, and can also control the power of the heating film 105, so that the heating film 105 generates heat to heat the battery cells 104. The relative position relationship between the heating film 105 and the battery cells 104 is not specifically described in this application. In this embodiment, the optional heating film 105 wraps the battery pack 101.

[0059] The energy storage system comprises the heating control device 103, which can be composed of a single-chip microcomputer, a microprocessor or the like. The heating control device 103 is connected to the battery pack 101 and the inverter 102 respectively, and is used to control whether to heat the battery pack 101 based on the temperature of the battery cells in the battery pack 101. It can be understood that the battery pack 101 and the inverter 102 in the energy storage system are in the same box.

[0060] The optional energy storage system further comprises a heat insulation layer 107 arranged between the battery pack 101 and the inverter 102; and a heating control device 103 connected to the heat insulation layer 107 and configured to control the heat insulation layer 107 to be opened or closed.

[0061] In this embodiment, the heat insulation layer 107 is arranged in the box in which the battery pack 101 and the inverter 102 are arranged, and is arranged between the battery pack 101 and the inverter 102. When the heat insulation layer 107 is opened, there is no isolation medium between the battery pack 101 and the inverter 102, and the air in the box flows and circulates between the battery pack 101 and the inverter 102. When the heat insulation layer 107 is closed, there is an isolation medium between the battery pack 101 and the inverter 102, and the air in the area where the inverter 102 is arranged and the air in the area where the battery pack 101 is arranged are isolated by the heat insulation layer 107 and are difficult to flow.

[0062] It should be noted that the structure, position relationship and connection relationship of the components of the energy storage system shown in FIG. 1 are only a simple schematic and are used to assist in explaining the working principle of the heating control method of this embodiment. In practice, the energy storage system further comprises other components, and the structure, position relationship and connection relationship of the components of the energy storage system are not limited to those shown in FIG. 1.

[0063] FIG. 2 is a schematic diagram of another energy storage system provided by an embodiment of the present application. As shown in FIG. 2, the energy storage system further comprises a photovoltaic array 108, and the inverter 102 is connected to the photovoltaic array 108. Sunlight is incident on the photovoltaic array 108, and the photovoltaic array 108 can convert light energy into direct current energy through the photovoltaic effect. The photovoltaic array 108 transmits the direct current energy to the inverter 102. Before power distribution and grid connection, the inverter 102 converts the direct current into alternating current and outputs the alternating current to other loads or the power grid. It can be understood that if part of the direct current energy provided by the photovoltaic array 108 cannot be temporarily connected to the grid due to the need for grid peak shaving and frequency regulation, the part of the direct current energy can be stored in the battery pack 101 through the inverter 102. When needed, the direct current in the battery pack 101 can be converted into alternating current through the inverter 102 and provided to other loads or the power grid.

[0064] In this embodiment, the inverter 102 can be a hybrid inverter, an AC inverter or other types of inverters, which is not specifically limited. The heat dissipation fan 106 is controlled by the heating control device 103, which can be controlled by MOS, relay and starting signal, etc. The heat dissipation fan 106 can be a DC fan, an AC fan or other types of fans. The battery cell 104 of the battery pack 101 can be a lithium iron phosphate cell, a ternary lithium cell or other types of cells. The heating control device 103 is the core device for all controls, which can be a microprocessor including BMS, DSP or ARM or a single-chip microcomputer, etc. The signal transmission of each component of the energy storage system can be wired or wireless. The heating film 105 is a thin film form, which at least includes a resistance wire and other heating materials, and the heating control device 103 can control the working or closing of the heating film 105.

[0065] The heat insulation layer 107 is an unnecessary component of the energy storage system, which can be set or not set. If the energy storage system has the heat insulation layer 107, the heat insulation layer 107 is closed at high temperature, which can isolate the inverter 102 and the battery pack 101, prevent the inverter 102 from continuously heating the battery cell 104, and prevent the battery cell 104 from being too high. The heat insulation layer 107 is opened at low temperature, which can make the waste heat of the inverter 102 transfer to the battery cell 104 for heating. At low temperature, the heat dissipation fan 106 and the heat insulation layer 107 can be closed or opened synchronously, but are not limited thereto.

[0066] The control logic of the heating control device 103 is that the waste heat of the inverter 102 can heat the battery cell 104 by strategy, and the heating film 105 can continue to heat the battery cell 104 by strategy when the waste heat of the inverter 102 is insufficient.

[0067] As described above, the energy storage system can include a light storage all-in-one machine.

[0068] Based on the above energy storage system, an embodiment of the present application provides a heating control method. FIG. 3 is a schematic diagram of a heating control method provided by an embodiment of the present application, as shown in FIG. 3, the heating control method includes:

[0069] Step 201, detecting the temperature of the battery cell;

[0070] Step 202, based on the temperature change of the battery cell, selecting a target heating mode matched with the temperature change of the battery cell from a plurality of heating modes of the energy storage system for heating control, and the heating mode at least includes a linkage control of the heat dissipation fan and the heating film.

[0071] In this embodiment, the heating control device detects the temperature of the battery cell. Specifically, a temperature sensor (not shown) is arranged on each battery cell in the battery pack, and the temperature sensor is connected to the battery cell to collect the temperature information of the battery cell. The heating control device is connected to the temperature sensor to obtain the temperature information of the battery cell through the temperature sensor. Based on this, the heating control device can detect the temperature of each battery cell in the battery pack, and obtain the temperature change of the battery cell in the battery pack, and also obtain the highest temperature and the lowest temperature of the battery cell in the battery pack.

[0072] The heating control device pre-stores a plurality of heating modes, at least including three heating modes. The first heating mode is to heat the battery cell by using the heat dissipation fan. A large amount of heat is generated during the operation of the inverter, and the air flow between the inverter and the battery pack can be accelerated by starting the heat dissipation fan, and the heat generated by the inverter is used to heat the battery pack, so as to improve the temperature of the battery cell. It can be understood that if there is a heat insulation layer between the battery pack and the inverter, the heat insulation layer is started at the same time when the heat dissipation fan is started, so as to realize the heat flow between the battery pack and the inverter.

[0073] The second heating mode is to heat the battery cell by using the heating film. The heating film is wrapped on the surface of the battery pack, and the battery pack can be directly and quickly heated by starting the heating film, so as to quickly improve the temperature of the battery cell.

[0074] The third heating mode is to heat the battery cell by using the heating film and the heat dissipation fan, that is, the combination of the first heating mode and the second heating mode. The air flow between the inverter and the battery pack is accelerated by starting the heat dissipation fan, and at the same time, the battery pack is directly heated by starting the heating film, so as to quickly improve the temperature of the battery cell.

[0075] As described above, after the heating control device obtains the temperature of the battery cell, the temperature change of the battery cell in the battery pack is detected. If it is detected that the temperature of the battery cell in the battery pack is too low, the charging and discharging efficiency of the battery pack is affected, at this time, the battery pack can be heated to improve the temperature of the battery pack, and then the charging and discharging efficiency of the battery pack is improved, and based on this, the heating control device can flexibly adjust the heating mode of the energy storage system according to the demand of the energy storage system. Specifically, the heating control device can control and adjust the heating mode of the energy storage system according to the instruction input by the user; or the heating control device can reasonably adjust the heating mode of the energy storage system based on the operating parameters of the energy storage system. Compared with the existing scheme of heating the battery cell by using the heating module, the heating mode of the heating control scheme can be flexibly adjusted, and different application requirements can be met.

[0076] Exemplarily, when the heating control device detects that the power of the energy storage system is high, the first heating mode can be reasonably selected to realize low-power electric cell heating. The heating control device adjusts to the first heating mode, that is, the electric cell is heated by using the heat dissipation fan. The operating power consumption of the heat dissipation fan is low, so the use of the heating mode will not greatly increase the power consumption of the energy storage system, and can also accelerate the circulation of the heat of the inverter in the box, fully utilize the heat generated by the inverter to improve the temperature of the electric cell, and realize low-power electric cell heating. It can be understood that the heat insulation layer can be turned on at the same time that the heat dissipation fan is turned on.

[0077] Exemplarily, when the heating control device detects that the battery pack charging and discharging efficiency is too low, the second heating mode can be reasonably selected to realize high-efficiency electric cell heating. The heating control device adjusts to the second heating mode, that is, the electric cell is heated by using the heating film. The heating film is wrapped around the surface of the battery pack, so turning on the heating film can directly and quickly heat the battery pack, thereby quickly improving the temperature of the electric cell, and realizing high-efficiency electric cell heating.

[0078] Exemplarily, when the heating control device detects that the battery pack cannot perform charging and discharging, the third heating mode can be reasonably selected to further improve the electric cell heating efficiency. The heating control device adjusts to the third heating mode, that is, the electric cell is heated by using the heating film and the heat dissipation fan at the same time. The heat dissipation fan is turned on to accelerate the circulation of the heat of the inverter in the box, and the heating film is turned on to directly heat the battery pack, thereby comprehensively improving the temperature of the electric cell, and realizing high-efficiency electric cell heating.

[0079] In the present application, the heating control device obtains the temperature of the electric cell in the battery pack, and controls flexible adjustment of the electric cell heating mode based on the temperature change of the electric cell in the battery pack. The electric cell heating mode can be adjusted to the first heating mode, that is, the heat dissipation fan is turned on, so as to realize low-power electric cell heating. Or, the electric cell heating mode can be adjusted to the second heating mode, that is, the heating film is turned on, so as to realize high-efficiency electric cell heating. Or, the electric cell heating mode can be adjusted to the heat dissipation fan and the heating film being turned on at the same time, so as to effectively utilize the heat generated by the inverter and further improve the electric cell heating efficiency. Compared with the prior art of using a heating module to heat the electric cell, the electric cell heating control method in the present application can flexibly adjust the heating mode, can meet different application scenarios and different use requirements, improves the electric energy utilization rate of the energy storage system, reduces the heating loss, and can keep the electric cell warm for a long time, saves electricity bills, has the advantages of low power consumption, high efficiency and low economic cost.

[0080] FIG. 4 is a schematic diagram of another heating control method provided by an embodiment of the present application. As shown in FIG. 4, the heating control method further includes:

[0081] In step 203, if the lowest temperature of the electric cell is greater than the first low-temperature threshold and / or the highest temperature is greater than the first high-temperature threshold, the heat dissipation fan and the heating film are both turned off.

[0082] The heating control device has a first low temperature threshold value and a first high temperature threshold value stored in advance, the first high temperature threshold value is greater than the first low temperature threshold value, and the first low temperature threshold value and the first high temperature threshold value can be used as a basis for determining whether to stop heating the battery cell. That is, when the temperature of the battery cell is within the range of the first low temperature threshold value and the first high temperature threshold value, the battery charging and discharging efficiency is good, and there is no need to increase the temperature of the battery cell. When the lowest temperature of the battery cell in the battery pack is lower than the first low temperature threshold value, it indicates that the charging and discharging efficiency of the battery pack is poor, and the temperature of the battery cell needs to be increased to improve the battery charging and discharging efficiency. When the highest temperature of the battery cell in the battery pack is higher than the first high temperature threshold value, further heating of the battery may cause safety problems, so there is no need to increase the temperature of the battery cell.

[0083] Based on this, the heating control device obtains the temperature of each battery cell in the battery pack, and obtains the lowest temperature of the battery cell and the highest temperature of the battery cell from the temperature of each battery cell in the battery pack. If the lowest temperature of the battery cell in the battery pack is greater than the first low temperature threshold value, the overall charging and discharging efficiency of the battery pack is good, and there is no need to increase the temperature of the battery cell, that is, the cooling fan and the heating film are both turned off. Or, if the highest temperature of the battery cell in the battery pack is greater than the first high temperature threshold value, it indicates that part of the battery cell temperature is high, and it is not suitable for further heating, that is, the cooling fan and the heating film are both turned off. Or, if the lowest temperature of the battery cell in the battery pack is greater than the first low temperature threshold value and the highest temperature of the battery cell is greater than the first high temperature threshold value, it indicates that part of the battery cell temperature is high, and it is not suitable for further heating, that is, the cooling fan and the heating film are both turned off.

[0084] It can be understood that the first low temperature threshold value and the first high temperature threshold value can be obtained by testing before the energy storage system is shipped and stored in the heating control device. In actual application, the user can use the default first low temperature threshold value and the first high temperature threshold value, but the user can also reasonably adjust the first low temperature threshold value and the first high temperature threshold value according to the actual application scenario of the product. For example, taking the battery charging and discharging efficiency of 70% at low temperature and the battery charging and discharging efficiency of 75% at high temperature as an example, the battery charging and discharging efficiency is 70% at 5°C and the battery charging and discharging efficiency is 75% at 55°C before shipment. Then the first low temperature threshold value can be set to 5°C and the first high temperature threshold value can be set to 55°C. When the temperature of the battery cell is within the range of the first low temperature threshold value and the first high temperature threshold value, the battery charging and discharging efficiency is good, and there is no need to increase the temperature of the battery cell. After shipment, the user can directly use the default first low temperature threshold value and the first high temperature threshold value, or can fine-tune the first low temperature threshold value and the first high temperature threshold value according to the actual use to meet the user's needs.

[0085] In the embodiment, the heating control device detects that the lowest temperature of the battery cell is greater than the first low temperature threshold, which indicates that the charging and discharging efficiency of the current battery pack meets the user's demand, and there is no need to heat the battery cell. Therefore, the heating control device controls the heat dissipation fan and the heating film to be closed, so as to reduce the flow speed of the heat of the inverter in the box. The heating control device detects that the highest temperature of the battery cell is greater than the first high temperature threshold, which indicates that the current battery pack has at least one battery cell with a temperature that is too high. If the battery cell continues to be heated, it may cause the temperature of part of the battery cell to be too high and dangerous. Therefore, the heating control device controls the heat dissipation fan and the heating film to be closed, so as to ensure the safety of the battery pack. If a heat insulation layer is arranged in the energy storage system, the heat dissipation fan is closed, and the heat insulation layer is also closed, so as to prevent the air flow between the inverter and the battery pack, and prevent the residual heat of the inverter from being transferred to the battery pack to heat the battery cell.

[0086] FIG. 5 is a schematic diagram of another heating control method provided by the embodiment. As shown in FIG. 5, the energy storage system used in the heating control method also includes a heat insulation layer arranged between the battery pack and the inverter. The energy storage system also includes a photovoltaic array, and the inverter is connected to the photovoltaic array. The plurality of heating modes of the energy storage system includes a first heating mode. Based on this, in the heating control method, the operation of selecting the target heating mode matched with the temperature change of the battery cell in step 202 includes: if the lowest temperature of the battery cell is less than the first low temperature threshold, and if the photovoltaic power of the photovoltaic array is greater than the first power threshold, or the output power of the inverter is greater than the second power threshold, the heating control device controls the first heating mode to be adjusted, and the first heating mode includes the heat dissipation fan being turned on and the heat insulation layer being opened.

[0087] Referring to FIG. 2, the input end of the inverter 102 is electrically connected to the photovoltaic array 108 and receives the direct current electrical energy converted by the photovoltaic array 108. The output end of the inverter 102 is connected to other loads or a power grid. When the inverter 102 works, it can convert the direct current electrical energy into alternating current and provide it to other loads or the power grid. If the direct current electrical energy provided by the photovoltaic array 108 is temporarily not connected to the power grid, the inverter 102 can also convert the excess direct current electrical energy and store it in the battery pack 101. The photovoltaic power of the photovoltaic array described herein is the power of the electrical signal entering the input end of the inverter. The output power of the inverter is the power of the electrical signal at the output end of the inverter.

[0088] The heating control device pre-stores a first power threshold and a second power threshold, the first power threshold is a judgment basis for judging the photovoltaic power of the photovoltaic array, and the second power threshold is a judgment basis for judging the output power of the inverter. The input end of the inverter is connected with the photovoltaic array to receive direct current provided by the photovoltaic array, the output end of the inverter is connected with the load or the power grid to output alternating current to the load or the power grid, and the inverter can convert the received direct current into alternating current. Optionally, the first power threshold and the second power threshold are both 100W, but are not limited thereto, and in other embodiments, the first power threshold and the second power threshold can be different, and the first power threshold and the second power threshold can be reasonably designed by the staff according to the needs of the product.

[0089] When the heating control device detects that the minimum temperature of the battery cell is less than the first low temperature threshold, it indicates that there is a situation that the temperature of the battery cell is too low in the battery pack, and the battery cell can be heated at this time. Then, the heating control device determines whether to use the waste heat of the inverter to heat the battery cell by judging the photovoltaic power of the photovoltaic array and the output power of the inverter. If the photovoltaic power of the photovoltaic array is high, or the output power of the inverter is high, the waste heat of the inverter can be used to heat the battery cell, realizing low-power battery cell heating; if the photovoltaic power of the photovoltaic array is low, or the output power of the inverter is low, other heating modes are selected to heat the battery cell.

[0090] When it is detected that the photovoltaic power of the photovoltaic array is greater than the first power threshold, or the output power of the inverter is greater than the second power threshold, it indicates that the operating power of the inverter is high, and the heat generated by the inverter is large at the corresponding time. At this time, the waste heat of the inverter can be preferentially used to heat the battery cell. By starting the cooling fan and the heat insulation layer, the heat of the inverter is transferred to the battery cell, and the temperature of the battery pack and the battery cell is improved. Compared with the existing heating module, the waste heat of the inverter is effectively used to heat the battery cell, not only realizing low-power battery cell heating, but also not causing waste of the heat of the inverter, having the advantages of low power consumption and economy.

[0091] On the contrary, when it is detected that the photovoltaic power of the photovoltaic array is less than the first power threshold, and the output power of the inverter is less than the second power threshold, it indicates that the operating power of the inverter is low, and the heat generated by the inverter is small at the corresponding time. At this time, the waste heat of the inverter is difficult to effectively improve the temperature of the battery cell, and other heating modes can be selected for battery cell heating.

[0092] Optionally, after the first heating mode, the control adjustment further includes: step 2021, if the temperature change rate of the battery is less than the first change rate threshold after the first set time period, the control turns off the heat dissipation fan. In this embodiment, when it is detected that the photovoltaic power of the photovoltaic array is greater than the first power threshold, or the output power of the inverter is greater than the second power threshold, the inverter waste heat can be preferentially used to heat the battery, and the heat of the inverter is transmitted to the battery by turning on the heat dissipation fan and the heat insulation layer. However, if the temperature change rate of the battery is less than the first change rate threshold after the first set time period, it indicates that the effect of heating the battery by the inverter waste heat is poor, and the inverter waste heat is difficult to effectively increase the temperature of the battery. Therefore, other heating modes can be selected for heating the battery. Correspondingly, the control turns off the heat dissipation fan, which can reduce power consumption. However, it can be understood that without considering power consumption, although the inverter waste heat temperature is difficult to significantly increase the temperature of the battery, the heat dissipation fan can also play a certain heat transfer role if it continues to be turned on. Therefore, the heat dissipation fan can also be kept on.

[0093] It can be understood that the first set time period and the first change rate threshold are pre-stored in the heating control device, and the first set time period and the first change rate threshold are reasonable design index parameters according to product requirements. For example, the first set time period is 5 minutes, and the first change rate threshold is 5%, but is not limited thereto. The first set time period and the first change rate threshold can be reasonably designed by the staff according to product requirements.

[0094] As shown in FIG. 5, the plurality of heating modes of the optional energy storage system include a second heating mode. In the heating control method, the operation of selecting a target heating mode matched with the temperature change of the battery for heating control in step 202 includes: step 202b, if the lowest temperature of the battery is less than the first low temperature threshold, and if the temperature change rate of the battery is less than the second change rate threshold after the second set time period, the control adjusts to the second heating mode, and the second heating mode includes starting the heating film to heat. It can be understood that the second set time period and the second change rate threshold are pre-stored in the heating control device, and the second set time period and the second change rate threshold are reasonable design index parameters according to product requirements. For example, the second set time period is 10 minutes, and the second change rate threshold is 10%, but is not limited thereto. The second set time period and the second change rate threshold can be reasonably designed by the staff according to product requirements.

[0095] In the embodiment, when the lowest temperature of the battery cell is detected to be less than the first low temperature threshold for the first time, the temperature of the battery cell can be continuously detected for a second set time period. After the second set time period, the lowest temperature of the battery cell in the battery pack is acquired for the second time. If the change rate of the second lowest temperature of the battery cell relative to the first lowest temperature of the battery cell is less than a second change rate threshold, it indicates that the temperature of the battery cell is persistently too low. At this time, the battery cell can be heated quickly and effectively by starting the heating film. In the embodiment, the heat dissipation fan can be turned on or turned off. The first set time period can be less than or equal to the second set time period, and the first change rate threshold can be less than or equal to the second change rate threshold. However, the embodiment is not limited thereto.

[0096] As shown in FIG. 5, the optional energy storage system further includes a photovoltaic array, and an inverter connected with the photovoltaic array. The plurality of heating modes of the energy storage system includes a second heating mode. In the heating control method, the operation of selecting the target heating mode matched with the temperature change of the battery cell for heating control in step 202 includes: step 202c, the lowest temperature of the battery cell is less than the first low temperature threshold. If it is detected that the photovoltaic power of the photovoltaic array is in a limited power state, or the photovoltaic power of the photovoltaic array is greater than the output power of the inverter, or the lowest temperature of the battery cell is less than a second low temperature threshold, the control is adjusted to the second heating mode, and the second heating mode includes starting the heating film to heat. The second low temperature threshold is less than the first low temperature threshold. It can be understood that the second low temperature threshold is pre-stored in the heating control device. The second low temperature threshold is a reasonable design index parameter according to the product requirement. For example, the second low temperature threshold is -5°C, but the embodiment is not limited thereto. The second low temperature threshold can be reasonably designed according to the product requirement by the staff.

[0097] In the embodiment, when the lowest temperature of the battery cell is detected to be less than the first low temperature threshold, the operating power of the inverter can be continuously detected to determine whether the battery cell can be heated by the waste heat of the inverter. If it is detected that the photovoltaic power of the photovoltaic array is in a limited power state, or the photovoltaic power of the photovoltaic array is greater than the output power of the inverter, it indicates that the photovoltaic power generation is in a state of supply greater than demand. Therefore, the heating film can be started to heat, that is, the excess photovoltaic power generation is fully utilized to supply power to the heating film, so as to heat the battery cell and improve the efficiency. Specifically, when the alternating current output by the inverter meets the alternating current power consumption of the load or the power grid, and the battery pack is fully charged, the photovoltaic power of the photovoltaic array needs to be set to a limited power state to avoid damage to the energy storage system caused by the excessively high photovoltaic power generation. Therefore, if the photovoltaic power of the photovoltaic array is in a limited power state, it indicates that the photovoltaic power generation is in a state of supply greater than demand.

[0098] Or, when it is detected that the lowest temperature of the battery cell is not only less than the first low temperature threshold, but also less than the second low temperature threshold, it means that the temperature of the battery cell is too low, at this time, the efficiency of the scheme of using the residual heat of the inverter to heat the battery cell is too low, therefore, the heating film is started to heat, which can efficiently improve the temperature of the battery cell.

[0099] As shown in FIG. 5, the optional energy storage system further comprises a photovoltaic array, and the inverter is connected with the photovoltaic array; the plurality of heating modes of the energy storage system comprises a third heating mode; in the heating control method, the operation of selecting the target heating mode matched with the temperature change of the battery cell for heating control in step 202 comprises: step 202d, if the lowest temperature of the battery cell is less than the first low temperature threshold, and if it is detected that the photovoltaic power of the photovoltaic array is in a limited power state and the lowest temperature of the battery cell is less than the second low temperature threshold, the third heating mode is controlled to be adjusted, and the third heating mode comprises starting the heating film while starting the heat dissipation fan; wherein the second low temperature threshold is less than the first low temperature threshold.

[0100] In this embodiment, if it is detected that the photovoltaic power of the photovoltaic array is in a limited power state, it means that the photovoltaic power generation is in a state of supply exceeding demand, and the photovoltaic power generation is sufficient and has a surplus, and there is no need to consider the power consumption problem. At the same time, it is detected that the lowest temperature of the battery cell is also less than the second low temperature threshold, which means that the temperature of the battery cell is too low. At this time, the heating film and the heat dissipation fan can be controlled to be started at the same time for heating, the residual heat of the inverter is used to heat the battery cell through the started heat dissipation fan, and the heating film is started to realize efficient heating by using the excess photovoltaic power generation, so that the temperature of the battery cell can be quickly and efficiently improved.

[0101] As shown in FIG. 5, after the operation of starting the heating film in step 202b, step 202c or step 202d, the operation further comprises: step 2022, if the temperature of the heating film is greater than or equal to the heating film limit temperature, the heating film is controlled to be closed.

[0102] In this embodiment, after the heating film is started, if the temperature of the heating film is greater than or equal to the heating film limit temperature, the heating film can be controlled to be closed for safety consideration. When the temperature of the heating film is reduced or the closed time length of the heating film reaches a certain time length, the heating film can be started again under the condition that the battery cell heating condition is met. For example, after the heating film is started, if the temperature of the heating film exceeds 85℃, the heating film is closed; if the temperature of the heating film is less than 70℃, the heating film can be started again if the lowest temperature of the battery cell meets the condition of starting the heating film; the above-mentioned process is repeated until the lowest temperature of the battery cell is greater than the first low temperature threshold or the highest temperature of the battery cell is greater than the first high temperature threshold, and the heating film is closed. The heating film limit temperature is preset in the heating control device, which can avoid high-temperature abnormities such as short circuit or dry burning of the heating film, reduce the risk of overheating of the battery cell, and improve the safety of the system.

[0103] After the operation of the heating film in the optional step 202b or the step 202c, the method further comprises: controlling the closing of the heat insulation layer. For the case that the heat insulation layer is arranged between the battery pack and the inverter, in the case that the heating film is used to heat the battery cells, if the heat dissipation fan is in the closed state, the heat insulation layer can be controlled to be closed, and then the battery pack is in a smaller box space, and the heating film can quickly increase the temperature of the battery cells, and the heat of the heating film is prevented from flowing to the inverter.

[0104] As described above, after the step 202, the method further comprises: a step 203, if the minimum temperature of the battery cells is greater than the first low temperature threshold and / or the maximum temperature is greater than the first high temperature threshold, the heat dissipation fan and the heating film are both controlled to be closed. The first high temperature threshold is greater than the first low temperature threshold.

[0105] In the embodiment, the heating control device flexibly adjusts the battery cell heating mode of the energy storage system according to the operating parameters of the battery pack and the operating parameters of the inverter, so as to realize the battery cell heating process with high efficiency, low power consumption and low economic cost.

[0106] FIG. 6 is a schematic diagram of another heating control method provided by the embodiment of the application. As shown in FIG. 6, the heating control method is different from the heating control method shown in FIG. 5. The heating control method shown in FIG. 6 can be applied to a photovoltaic energy storage system. The specific steps of the heating control method are as follows:

[0107] In step 301, it is detected whether the minimum temperature Tcmin of the battery cells is less than 0℃. If yes, step 302 is performed; if no, step 321 is performed.

[0108] In step 302, it is detected whether the system is faulty, especially whether the parameters of the battery pack are normal. If the system is normal, step 303 is performed; if the system is faulty, step 322 is performed.

[0109] In step 303, it is detected whether the photovoltaic power Ppv of the photovoltaic array is greater than 100W, or whether the output power Pac of the inverter is greater than 100W. The first power threshold and the second power threshold are both 100W. If Ppv>100W or Pac>100W, step 304 is performed; if Ppv≤100W and Pac≤100W, step 307 is performed.

[0110] In step 304, the heat dissipation fan of the inverter is started to heat the battery cells with the waste heat of the inverter. If a heat insulation layer is arranged between the inverter and the battery pack, the heat insulation layer is opened at the same time, so that the waste heat of the inverter is more easily transferred to the battery pack, and the temperature of the battery cells is effectively increased.

[0111] Step 305, detecting whether the minimum temperature Tcmin of the battery cell is greater than 5℃ or the maximum temperature Tcmax of the battery cell is greater than 55℃, wherein the optional first low temperature threshold is 5℃ and the first high temperature threshold is 55℃; if not, executing step 306; if yes, executing step 320;

[0112] Step 306, detecting whether the photovoltaic power Ppv of the photovoltaic array is in the limited power state or the photovoltaic power Ppv of the photovoltaic array is greater than the output power Pac; if yes, executing step 307; if not, returning to execute step 301, or returning to execute step 304 or maintaining the original state in other embodiments;

[0113] Step 307, detecting whether the minimum temperature Tcmin of the battery cell is less than -5℃, wherein the optional second low temperature threshold is -5℃; if yes, executing step 308; if not, returning to execute step 301;

[0114] Step 308, starting the heating film; it is necessary to point out that the battery cell temperature does not rise or fall, and the heating film is started, which can use the excess energy of the battery pack or the grid energy to power the heating film, and use the heating film to heat the battery cell;

[0115] Step 309, detecting the heating film temperature and the minimum temperature Tcmin of the battery cell; according to different heating conditions, executing steps 310a to 310d;

[0116] Step 310a, the heating film temperature is greater than 85℃ and the minimum temperature Tcmin of the battery cell is less than 5℃, stopping the heating film, and returning to step 309, wherein the optional heating film limit temperature is 85℃;

[0117] Step 310b, the heating film temperature is less than 85℃ and the minimum temperature Tcmin of the battery cell is less than 5℃, starting the heating film, and returning to step 309;

[0118] Step 310c, the minimum temperature Tcmin of the battery cell is greater than 5℃ or the maximum temperature Tcmax of the battery cell is greater than 55℃, closing the heating film;

[0119] Step 310d, the heating film temperature is greater than 110℃, closing the heating film, and returning to step 302.

[0120] Step 320, closing the heat dissipation fan; if there is a heat insulation layer between the inverter and the battery pack, the heat insulation layer is also closed at the same time of closing the heat dissipation fan, preventing the residual heat of the inverter from continuing to heat the battery cell.

[0121] Step 321, maintaining the original state and returning to execute step 301.

[0122] Step 322, alarming.

[0123] Based on the same inventive concept, the application further provides a heating control device, which is applied to the energy storage system shown in FIG. 1 or FIG. 2, and the energy storage system comprises a battery pack, an inverter and a cooling fan in the same box, the battery pack comprises a battery cell and a heating film. The energy storage system further comprises the heating control device, and the heating control device can execute the heating control method of any of the above embodiments.

[0124] FIG. 7 is a schematic diagram of a heating control device provided by an embodiment of the application. As shown in FIG. 7, the heating control device comprises a temperature detection module 410 and a heating control module 420; the temperature detection module 410 is configured to detect the temperature of the battery cell; and the heating control module 420 is configured to select a target heating mode matched with the temperature change of the battery cell from a plurality of heating modes of the energy storage system based on the temperature change of the battery cell, and perform heating control. The heating mode at least comprises linkage control of the cooling fan and the heating film. The heating control device provided by the embodiment can execute the heating control method provided by any of the embodiments of the application, and has the corresponding function modules and beneficial effects of the execution method.

[0125] In the application, the heating control device acquires the temperature of the battery cell in the battery pack, and flexibly adjusts the heating mode of the battery cell based on the temperature change of the battery cell in the battery pack; the heating mode can be adjusted to turn on the cooling fan, so that low-power battery cell heating can be achieved; or the heating mode can be adjusted to turn on the heating film, so that high-efficiency battery cell heating can be achieved; or the heating mode can be adjusted to turn on the cooling fan and the heating film at the same time to heat the battery cell, so that the heat generated by the inverter can be effectively utilized, and the battery cell heating efficiency can be further improved. Compared with the prior art of using a heating module to heat the battery cell, the heating control method of the battery cell in the application can flexibly adjust the heating mode, and can meet different application scenarios and different use requirements.

[0126] Based on the energy storage system of the heating control device, any component of the inverter and the heating film can be used to heat the battery cell, and has the advantages of low power consumption, high efficiency and low economic cost. Specifically, the self-heating of the inverter can be used to heat the battery cell at low temperature, which can reduce the power consumption of the heating film and achieve low-power battery cell heating. If the self-heating of the inverter cannot effectively increase the temperature of the battery cell, the heating film can be turned on to further heat, so as to quickly increase the temperature of the battery cell, make the battery cell operate in the chargeable and dischargeable temperature range, improve the battery cell heating efficiency, and ensure that the battery pack can normally charge and discharge.

[0127] FIG. 8 is a schematic diagram of an electronic device provided by an embodiment of the present application. As shown in FIG. 8, the electronic device 510 is intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device 510 can also represent various forms of mobile devices, such as personal digital assistants, cellular telephones, smartphones, wearable devices (e.g., headsets, glasses, watches, etc.), and other similar computing devices. The components shown in the FIG. 8, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present application described and / or claimed in this document.

[0128] As shown in FIG. 8, the electronic device 510 includes at least one processor 511, and a memory, such as a read-only memory (ROM) 512, a random access memory (RAM) 513, etc., connected to the at least one processor 511, where the memory stores computer programs executable by the at least one processor 511, and the processor 511 can perform various appropriate actions and processes according to the computer programs stored in the read-only memory (ROM) 512 or loaded into the random access memory (RAM) 513 from the storage unit 518. In the RAM 513, various programs and data required for the operation of the electronic device 510 can also be stored. The processor 511, the ROM 512, and the RAM 513 are connected to each other through a bus 514. An input / output (I / O) interface 515 is also connected to the bus 514.

[0129] Various components in the electronic device 510 are connected to the I / O interface 515, including an input unit 516, such as a keyboard, a mouse, etc., an output unit 517, such as various types of displays, a speaker, etc., a storage unit 518, such as a magnetic disk, an optical disk, etc., and a communication unit 519, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 519 allows the electronic device 510 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0130] The processor 511 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 511 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 511 performs various methods and processes described above.

[0131] In some embodiments, the various methods described above can be implemented as a computer program tangibly embodied in a computer readable storage medium, e.g., storage unit 518. In some embodiments, portions of or all of the computer program can be loaded onto the electronic device 510 via the ROM 512 and / or the communication unit 519. When a computer program is loaded onto the RAM 513 and executed by the processor 511, one or more steps of the above described methods can be performed. Alternatively, in other embodiments, the processor 511 can be configured to perform the various methods described above by other means, e.g., with the aid of firmware.

[0132] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0133] Computer programs used to implement the methods of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the computer program, when executed by the processor of the machine, implements the functions / acts specified in the flowcharts and / or block diagrams. The computer program can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0134] In the context of this application, a computer readable storage medium can be a tangible medium that can contain or store computer programs for use by or in connection with an instruction execution system, apparatus, or device. Computer readable storage media can include, but are not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, a computer readable storage medium can be a machine readable signal medium. More specific examples of the machine readable storage medium will include a one or more lines of a electrical connection, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0135] To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0136] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), blockchain network, and the Internet.

[0137] The computing system can include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. A server can be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system, to solve the defects of large management difficulty and weak business scalability in traditional physical host and VPS service.

[0138] It should be understood that the various forms of flow shown above can be reordered, added to, or have steps deleted. For example, the steps described in this application can be performed in parallel, in series, or in a different order, as long as the desired results of the technical solutions of this application can be achieved, and this application does not limit herein.

[0139] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0140] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A heating control method, wherein, A heating control method is applied to an energy storage system, which includes a battery pack, an inverter, and a cooling fan housed in the same enclosure. The battery pack includes battery cells and a heating film. The heating control method includes: Detect the temperature of the battery cell; Based on the temperature change of the battery cell, a target heating mode that matches the temperature change of the battery cell is selected from multiple heating modes of the energy storage system for heating control. The heating mode includes at least the linkage control of the cooling fan and the heating film.

2. The heating control method according to claim 1, wherein, Also includes: If the lowest temperature of the battery cell is greater than a first low temperature threshold and / or the highest temperature is greater than a first high temperature threshold, the cooling fan and the heating film are both turned off.

3. The heating control method according to claim 1, wherein, A heat insulation layer is provided between the battery pack and the inverter. The energy storage system also includes a photovoltaic array, and the inverter is connected to the photovoltaic array. The energy storage system has multiple heating modes, including a first heating mode. Selecting a target heating mode that matches the temperature change of the battery cell for heating control includes: if the lowest temperature of the battery cell is less than a first low temperature threshold, if the photovoltaic power of the photovoltaic array is detected to be greater than a first power threshold, or if the output power of the inverter is greater than a second power threshold, the control is adjusted to the first heating mode, wherein the first heating mode includes turning on the cooling fan and opening the heat insulation layer.

4. The heating control method according to claim 3, wherein, After the control is adjusted to the first heating mode, it also includes: If the temperature change rate of the battery cell is less than a first change rate threshold after a first set time, the cooling fan is turned off.

5. The heating control method according to claim 1, wherein, The energy storage system has multiple heating modes, including a second heating mode; Selecting a target heating mode that matches the temperature change of the battery cell for heating control includes: If the lowest temperature of the battery cell is less than a first low temperature threshold, and the temperature change rate of the battery cell is less than a second change rate threshold after a second set time, the control is adjusted to the second heating mode, which includes activating the heating film for heating.

6. The heating control method according to claim 1, wherein, The energy storage system also includes a photovoltaic array, and the inverter is connected to the photovoltaic array; the energy storage system has multiple heating modes, including a second heating mode. Selecting a target heating mode that matches the temperature change of the battery cell for heating control includes: If the lowest temperature of the battery cell is less than a first low temperature threshold, and if the photovoltaic power of the photovoltaic array is detected to be in a limited power state, or if the photovoltaic power of the photovoltaic array is greater than the output power of the inverter, or if the lowest temperature of the battery cell is less than a second low temperature threshold, the control is adjusted to the second heating mode, which includes activating the heating film for heating. Wherein, the second low temperature threshold is less than the first low temperature threshold.

7. The heating control method according to claim 1, wherein, The energy storage system also includes a photovoltaic array, and the inverter is connected to the photovoltaic array; the energy storage system has multiple heating modes, including a third heating mode. Selecting a target heating mode that matches the temperature change of the battery cell for heating control includes: If the lowest temperature of the battery cell is less than a first low temperature threshold, and if it is detected that the photovoltaic power of the photovoltaic array is in a limited power state and the lowest temperature of the battery cell is less than a second low temperature threshold, the control is adjusted to the third heating mode, which includes turning on the cooling fan and activating the heating film. Wherein, the second low temperature threshold is less than the first low temperature threshold.

8. The heating control method according to any one of claims 5 to 7, wherein, After activating the heating film, the following is also included: If the temperature of the heating film is greater than or equal to the heating film limit temperature, the heating film is controlled to be turned off.

9. The heating control method according to claim 5 or 6, wherein, A heat insulation layer is provided between the battery pack and the inverter; After activating the heating film, the method further includes controlling the shutdown of the heat insulation layer.

10. A heating control device, wherein, A heating control device is applied to an energy storage system, which includes a battery pack, an inverter, and a cooling fan housed in the same enclosure. The battery pack includes battery cells and a heating film. The heating control device includes: Temperature detection module, used to detect the temperature of the battery cell; A heating control module is used to select a target heating mode that matches the temperature change of the battery cell from multiple heating modes of the energy storage system based on the temperature change of the battery cell, and to perform heating control. The heating mode includes at least the linkage control of the cooling fan and the heating film.

11. An energy storage system, wherein, include: Battery pack, inverter, cooling fan, and heating control device as described in claim 10; The battery pack includes battery cells and a heating film; The heating control device is connected to the battery pack, the inverter, and the cooling fan, respectively.

12. The energy storage system according to claim 11, wherein, Also includes: A heat insulation layer is disposed between the battery pack and the inverter; The heating control device is connected to the insulation layer and is used to control the opening or closing of the insulation layer.

Images